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1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2/*
3 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
4 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
5 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
6 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
7 * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
8 */
9
10#include <linux/completion.h>
11#include <linux/dma-mapping.h>
12#include <linux/device.h>
13#include <linux/module.h>
14#include <linux/err.h>
15#include <linux/idr.h>
16#include <linux/interrupt.h>
17#include <linux/random.h>
18#include <linux/rbtree.h>
19#include <linux/spinlock.h>
20#include <linux/slab.h>
21#include <linux/sysfs.h>
22#include <linux/workqueue.h>
23#include <linux/kdev_t.h>
24#include <linux/etherdevice.h>
25
26#include <rdma/ib_cache.h>
27#include <rdma/ib_cm.h>
28#include <rdma/ib_sysfs.h>
29#include "cm_msgs.h"
30#include "core_priv.h"
31#include "cm_trace.h"
32
33MODULE_AUTHOR("Sean Hefty");
34MODULE_DESCRIPTION("InfiniBand CM");
35MODULE_LICENSE("Dual BSD/GPL");
36
37static const char * const ibcm_rej_reason_strs[] = {
38 [IB_CM_REJ_NO_QP] = "no QP",
39 [IB_CM_REJ_NO_EEC] = "no EEC",
40 [IB_CM_REJ_NO_RESOURCES] = "no resources",
41 [IB_CM_REJ_TIMEOUT] = "timeout",
42 [IB_CM_REJ_UNSUPPORTED] = "unsupported",
43 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
44 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
45 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
46 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
47 [IB_CM_REJ_STALE_CONN] = "stale conn",
48 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
49 [IB_CM_REJ_INVALID_GID] = "invalid GID",
50 [IB_CM_REJ_INVALID_LID] = "invalid LID",
51 [IB_CM_REJ_INVALID_SL] = "invalid SL",
52 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
53 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
54 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
55 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
56 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
57 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
58 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
59 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
60 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
61 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
62 [IB_CM_REJ_PORT_REDIRECT] = "port redirect",
63 [IB_CM_REJ_INVALID_MTU] = "invalid MTU",
64 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
65 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
66 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
67 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
68 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
69 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
70 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
71 [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] =
72 "vendor option is not supported",
73};
74
75const char *__attribute_const__ ibcm_reject_msg(int reason)
76{
77 size_t index = reason;
78
79 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
80 ibcm_rej_reason_strs[index])
81 return ibcm_rej_reason_strs[index];
82 else
83 return "unrecognized reason";
84}
85EXPORT_SYMBOL(ibcm_reject_msg);
86
87struct cm_id_private;
88struct cm_work;
89static int cm_add_one(struct ib_device *device);
90static void cm_remove_one(struct ib_device *device, void *client_data);
91static void cm_process_work(struct cm_id_private *cm_id_priv,
92 struct cm_work *work);
93static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
94 struct ib_cm_sidr_rep_param *param);
95static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
96 const void *private_data, u8 private_data_len);
97static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
98 void *private_data, u8 private_data_len);
99static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
100 enum ib_cm_rej_reason reason, void *ari,
101 u8 ari_length, const void *private_data,
102 u8 private_data_len);
103
104static struct ib_client cm_client = {
105 .name = "cm",
106 .add = cm_add_one,
107 .remove = cm_remove_one
108};
109
110static struct ib_cm {
111 spinlock_t lock;
112 struct list_head device_list;
113 rwlock_t device_lock;
114 struct rb_root listen_service_table;
115 u64 listen_service_id;
116 /* struct rb_root peer_service_table; todo: fix peer to peer */
117 struct rb_root remote_qp_table;
118 struct rb_root remote_id_table;
119 struct rb_root remote_sidr_table;
120 struct xarray local_id_table;
121 u32 local_id_next;
122 __be32 random_id_operand;
123 struct list_head timewait_list;
124 struct workqueue_struct *wq;
125} cm;
126
127/* Counter indexes ordered by attribute ID */
128enum {
129 CM_REQ_COUNTER,
130 CM_MRA_COUNTER,
131 CM_REJ_COUNTER,
132 CM_REP_COUNTER,
133 CM_RTU_COUNTER,
134 CM_DREQ_COUNTER,
135 CM_DREP_COUNTER,
136 CM_SIDR_REQ_COUNTER,
137 CM_SIDR_REP_COUNTER,
138 CM_LAP_COUNTER,
139 CM_APR_COUNTER,
140 CM_ATTR_COUNT,
141 CM_ATTR_ID_OFFSET = 0x0010,
142};
143
144enum {
145 CM_XMIT,
146 CM_XMIT_RETRIES,
147 CM_RECV,
148 CM_RECV_DUPLICATES,
149 CM_COUNTER_GROUPS
150};
151
152struct cm_counter_attribute {
153 struct ib_port_attribute attr;
154 unsigned short group;
155 unsigned short index;
156};
157
158struct cm_port {
159 struct cm_device *cm_dev;
160 struct ib_mad_agent *mad_agent;
161 u32 port_num;
162 atomic_long_t counters[CM_COUNTER_GROUPS][CM_ATTR_COUNT];
163};
164
165struct cm_device {
166 struct kref kref;
167 struct list_head list;
168 spinlock_t mad_agent_lock;
169 struct ib_device *ib_device;
170 u8 ack_delay;
171 int going_down;
172 struct cm_port *port[];
173};
174
175struct cm_av {
176 struct cm_port *port;
177 struct rdma_ah_attr ah_attr;
178 u16 dlid_datapath;
179 u16 pkey_index;
180 u8 timeout;
181};
182
183struct cm_work {
184 struct delayed_work work;
185 struct list_head list;
186 struct cm_port *port;
187 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
188 __be32 local_id; /* Established / timewait */
189 __be32 remote_id;
190 struct ib_cm_event cm_event;
191 struct sa_path_rec path[];
192};
193
194struct cm_timewait_info {
195 struct cm_work work;
196 struct list_head list;
197 struct rb_node remote_qp_node;
198 struct rb_node remote_id_node;
199 __be64 remote_ca_guid;
200 __be32 remote_qpn;
201 u8 inserted_remote_qp;
202 u8 inserted_remote_id;
203};
204
205struct cm_id_private {
206 struct ib_cm_id id;
207
208 struct rb_node service_node;
209 struct rb_node sidr_id_node;
210 u32 sidr_slid;
211 spinlock_t lock; /* Do not acquire inside cm.lock */
212 struct completion comp;
213 refcount_t refcount;
214 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
215 * Protected by the cm.lock spinlock.
216 */
217 int listen_sharecount;
218 struct rcu_head rcu;
219
220 struct ib_mad_send_buf *msg;
221 struct cm_timewait_info *timewait_info;
222 /* todo: use alternate port on send failure */
223 struct cm_av av;
224 struct cm_av alt_av;
225
226 void *private_data;
227 __be64 tid;
228 __be32 local_qpn;
229 __be32 remote_qpn;
230 enum ib_qp_type qp_type;
231 __be32 sq_psn;
232 __be32 rq_psn;
233 int timeout_ms;
234 enum ib_mtu path_mtu;
235 __be16 pkey;
236 u8 private_data_len;
237 u8 max_cm_retries;
238 u8 responder_resources;
239 u8 initiator_depth;
240 u8 retry_count;
241 u8 rnr_retry_count;
242 u8 service_timeout;
243 u8 target_ack_delay;
244
245 struct list_head work_list;
246 atomic_t work_count;
247
248 struct rdma_ucm_ece ece;
249};
250
251static void cm_dev_release(struct kref *kref)
252{
253 struct cm_device *cm_dev = container_of(kref, struct cm_device, kref);
254 u32 i;
255
256 rdma_for_each_port(cm_dev->ib_device, i)
257 kfree(cm_dev->port[i - 1]);
258
259 kfree(cm_dev);
260}
261
262static void cm_device_put(struct cm_device *cm_dev)
263{
264 kref_put(&cm_dev->kref, cm_dev_release);
265}
266
267static void cm_work_handler(struct work_struct *work);
268
269static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
270{
271 if (refcount_dec_and_test(&cm_id_priv->refcount))
272 complete(&cm_id_priv->comp);
273}
274
275static struct ib_mad_send_buf *cm_alloc_msg(struct cm_id_private *cm_id_priv)
276{
277 struct ib_mad_agent *mad_agent;
278 struct ib_mad_send_buf *m;
279 struct ib_ah *ah;
280
281 lockdep_assert_held(&cm_id_priv->lock);
282
283 if (!cm_id_priv->av.port)
284 return ERR_PTR(-EINVAL);
285
286 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
287 mad_agent = cm_id_priv->av.port->mad_agent;
288 if (!mad_agent) {
289 m = ERR_PTR(-EINVAL);
290 goto out;
291 }
292
293 ah = rdma_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr, 0);
294 if (IS_ERR(ah)) {
295 m = ERR_CAST(ah);
296 goto out;
297 }
298
299 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
300 cm_id_priv->av.pkey_index,
301 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
302 GFP_ATOMIC,
303 IB_MGMT_BASE_VERSION);
304 if (IS_ERR(m)) {
305 rdma_destroy_ah(ah, 0);
306 goto out;
307 }
308
309 /* Timeout set by caller if response is expected. */
310 m->ah = ah;
311 m->retries = cm_id_priv->max_cm_retries;
312
313 refcount_inc(&cm_id_priv->refcount);
314 m->context[0] = cm_id_priv;
315
316out:
317 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
318 return m;
319}
320
321static void cm_free_msg(struct ib_mad_send_buf *msg)
322{
323 struct cm_id_private *cm_id_priv = msg->context[0];
324
325 if (msg->ah)
326 rdma_destroy_ah(msg->ah, 0);
327 cm_deref_id(cm_id_priv);
328 ib_free_send_mad(msg);
329}
330
331static struct ib_mad_send_buf *
332cm_alloc_priv_msg(struct cm_id_private *cm_id_priv)
333{
334 struct ib_mad_send_buf *msg;
335
336 lockdep_assert_held(&cm_id_priv->lock);
337
338 msg = cm_alloc_msg(cm_id_priv);
339 if (IS_ERR(msg))
340 return msg;
341 cm_id_priv->msg = msg;
342 return msg;
343}
344
345static void cm_free_priv_msg(struct ib_mad_send_buf *msg)
346{
347 struct cm_id_private *cm_id_priv = msg->context[0];
348
349 lockdep_assert_held(&cm_id_priv->lock);
350
351 if (!WARN_ON(cm_id_priv->msg != msg))
352 cm_id_priv->msg = NULL;
353
354 if (msg->ah)
355 rdma_destroy_ah(msg->ah, 0);
356 cm_deref_id(cm_id_priv);
357 ib_free_send_mad(msg);
358}
359
360static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
361 struct ib_mad_recv_wc *mad_recv_wc)
362{
363 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
364 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
365 GFP_ATOMIC,
366 IB_MGMT_BASE_VERSION);
367}
368
369static int cm_create_response_msg_ah(struct cm_port *port,
370 struct ib_mad_recv_wc *mad_recv_wc,
371 struct ib_mad_send_buf *msg)
372{
373 struct ib_ah *ah;
374
375 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
376 mad_recv_wc->recv_buf.grh, port->port_num);
377 if (IS_ERR(ah))
378 return PTR_ERR(ah);
379
380 msg->ah = ah;
381 return 0;
382}
383
384static int cm_alloc_response_msg(struct cm_port *port,
385 struct ib_mad_recv_wc *mad_recv_wc,
386 struct ib_mad_send_buf **msg)
387{
388 struct ib_mad_send_buf *m;
389 int ret;
390
391 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
392 if (IS_ERR(m))
393 return PTR_ERR(m);
394
395 ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
396 if (ret) {
397 ib_free_send_mad(m);
398 return ret;
399 }
400
401 *msg = m;
402 return 0;
403}
404
405static void cm_free_response_msg(struct ib_mad_send_buf *msg)
406{
407 if (msg->ah)
408 rdma_destroy_ah(msg->ah, 0);
409 ib_free_send_mad(msg);
410}
411
412static void *cm_copy_private_data(const void *private_data, u8 private_data_len)
413{
414 void *data;
415
416 if (!private_data || !private_data_len)
417 return NULL;
418
419 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
420 if (!data)
421 return ERR_PTR(-ENOMEM);
422
423 return data;
424}
425
426static void cm_set_private_data(struct cm_id_private *cm_id_priv,
427 void *private_data, u8 private_data_len)
428{
429 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
430 kfree(cm_id_priv->private_data);
431
432 cm_id_priv->private_data = private_data;
433 cm_id_priv->private_data_len = private_data_len;
434}
435
436static void cm_set_av_port(struct cm_av *av, struct cm_port *port)
437{
438 struct cm_port *old_port = av->port;
439
440 if (old_port == port)
441 return;
442
443 av->port = port;
444 if (old_port)
445 cm_device_put(old_port->cm_dev);
446 if (port)
447 kref_get(&port->cm_dev->kref);
448}
449
450static void cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
451 struct rdma_ah_attr *ah_attr, struct cm_av *av)
452{
453 cm_set_av_port(av, port);
454 av->pkey_index = wc->pkey_index;
455 rdma_move_ah_attr(&av->ah_attr, ah_attr);
456}
457
458static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
459 struct ib_grh *grh, struct cm_av *av)
460{
461 cm_set_av_port(av, port);
462 av->pkey_index = wc->pkey_index;
463 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
464 port->port_num, wc,
465 grh, &av->ah_attr);
466}
467
468static struct cm_port *
469get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
470{
471 struct cm_device *cm_dev;
472 struct cm_port *port = NULL;
473 unsigned long flags;
474
475 if (attr) {
476 read_lock_irqsave(&cm.device_lock, flags);
477 list_for_each_entry(cm_dev, &cm.device_list, list) {
478 if (cm_dev->ib_device == attr->device) {
479 port = cm_dev->port[attr->port_num - 1];
480 break;
481 }
482 }
483 read_unlock_irqrestore(&cm.device_lock, flags);
484 } else {
485 /* SGID attribute can be NULL in following
486 * conditions.
487 * (a) Alternative path
488 * (b) IB link layer without GRH
489 * (c) LAP send messages
490 */
491 read_lock_irqsave(&cm.device_lock, flags);
492 list_for_each_entry(cm_dev, &cm.device_list, list) {
493 attr = rdma_find_gid(cm_dev->ib_device,
494 &path->sgid,
495 sa_conv_pathrec_to_gid_type(path),
496 NULL);
497 if (!IS_ERR(attr)) {
498 port = cm_dev->port[attr->port_num - 1];
499 break;
500 }
501 }
502 read_unlock_irqrestore(&cm.device_lock, flags);
503 if (port)
504 rdma_put_gid_attr(attr);
505 }
506 return port;
507}
508
509static int cm_init_av_by_path(struct sa_path_rec *path,
510 const struct ib_gid_attr *sgid_attr,
511 struct cm_av *av)
512{
513 struct rdma_ah_attr new_ah_attr;
514 struct cm_device *cm_dev;
515 struct cm_port *port;
516 int ret;
517
518 port = get_cm_port_from_path(path, sgid_attr);
519 if (!port)
520 return -EINVAL;
521 cm_dev = port->cm_dev;
522
523 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
524 be16_to_cpu(path->pkey), &av->pkey_index);
525 if (ret)
526 return ret;
527
528 cm_set_av_port(av, port);
529
530 /*
531 * av->ah_attr might be initialized based on wc or during
532 * request processing time which might have reference to sgid_attr.
533 * So initialize a new ah_attr on stack.
534 * If initialization fails, old ah_attr is used for sending any
535 * responses. If initialization is successful, than new ah_attr
536 * is used by overwriting the old one. So that right ah_attr
537 * can be used to return an error response.
538 */
539 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
540 &new_ah_attr, sgid_attr);
541 if (ret)
542 return ret;
543
544 av->timeout = path->packet_life_time + 1;
545 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
546 return 0;
547}
548
549/* Move av created by cm_init_av_by_path(), so av.dgid is not moved */
550static void cm_move_av_from_path(struct cm_av *dest, struct cm_av *src)
551{
552 cm_set_av_port(dest, src->port);
553 cm_set_av_port(src, NULL);
554 dest->pkey_index = src->pkey_index;
555 rdma_move_ah_attr(&dest->ah_attr, &src->ah_attr);
556 dest->timeout = src->timeout;
557}
558
559static void cm_destroy_av(struct cm_av *av)
560{
561 rdma_destroy_ah_attr(&av->ah_attr);
562 cm_set_av_port(av, NULL);
563}
564
565static u32 cm_local_id(__be32 local_id)
566{
567 return (__force u32) (local_id ^ cm.random_id_operand);
568}
569
570static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id)
571{
572 struct cm_id_private *cm_id_priv;
573
574 rcu_read_lock();
575 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id));
576 if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id ||
577 !refcount_inc_not_zero(&cm_id_priv->refcount))
578 cm_id_priv = NULL;
579 rcu_read_unlock();
580
581 return cm_id_priv;
582}
583
584/*
585 * Trivial helpers to strip endian annotation and compare; the
586 * endianness doesn't actually matter since we just need a stable
587 * order for the RB tree.
588 */
589static int be32_lt(__be32 a, __be32 b)
590{
591 return (__force u32) a < (__force u32) b;
592}
593
594static int be32_gt(__be32 a, __be32 b)
595{
596 return (__force u32) a > (__force u32) b;
597}
598
599static int be64_lt(__be64 a, __be64 b)
600{
601 return (__force u64) a < (__force u64) b;
602}
603
604static int be64_gt(__be64 a, __be64 b)
605{
606 return (__force u64) a > (__force u64) b;
607}
608
609/*
610 * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv
611 * if the new ID was inserted, NULL if it could not be inserted due to a
612 * collision, or the existing cm_id_priv ready for shared usage.
613 */
614static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv,
615 ib_cm_handler shared_handler)
616{
617 struct rb_node **link = &cm.listen_service_table.rb_node;
618 struct rb_node *parent = NULL;
619 struct cm_id_private *cur_cm_id_priv;
620 __be64 service_id = cm_id_priv->id.service_id;
621 unsigned long flags;
622
623 spin_lock_irqsave(&cm.lock, flags);
624 while (*link) {
625 parent = *link;
626 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
627 service_node);
628
629 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
630 link = &(*link)->rb_left;
631 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
632 link = &(*link)->rb_right;
633 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
634 link = &(*link)->rb_left;
635 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
636 link = &(*link)->rb_right;
637 else {
638 /*
639 * Sharing an ib_cm_id with different handlers is not
640 * supported
641 */
642 if (cur_cm_id_priv->id.cm_handler != shared_handler ||
643 cur_cm_id_priv->id.context ||
644 WARN_ON(!cur_cm_id_priv->id.cm_handler)) {
645 spin_unlock_irqrestore(&cm.lock, flags);
646 return NULL;
647 }
648 refcount_inc(&cur_cm_id_priv->refcount);
649 cur_cm_id_priv->listen_sharecount++;
650 spin_unlock_irqrestore(&cm.lock, flags);
651 return cur_cm_id_priv;
652 }
653 }
654 cm_id_priv->listen_sharecount++;
655 rb_link_node(&cm_id_priv->service_node, parent, link);
656 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
657 spin_unlock_irqrestore(&cm.lock, flags);
658 return cm_id_priv;
659}
660
661static struct cm_id_private *cm_find_listen(struct ib_device *device,
662 __be64 service_id)
663{
664 struct rb_node *node = cm.listen_service_table.rb_node;
665 struct cm_id_private *cm_id_priv;
666
667 while (node) {
668 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
669
670 if (device < cm_id_priv->id.device)
671 node = node->rb_left;
672 else if (device > cm_id_priv->id.device)
673 node = node->rb_right;
674 else if (be64_lt(service_id, cm_id_priv->id.service_id))
675 node = node->rb_left;
676 else if (be64_gt(service_id, cm_id_priv->id.service_id))
677 node = node->rb_right;
678 else {
679 refcount_inc(&cm_id_priv->refcount);
680 return cm_id_priv;
681 }
682 }
683 return NULL;
684}
685
686static struct cm_timewait_info *
687cm_insert_remote_id(struct cm_timewait_info *timewait_info)
688{
689 struct rb_node **link = &cm.remote_id_table.rb_node;
690 struct rb_node *parent = NULL;
691 struct cm_timewait_info *cur_timewait_info;
692 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
693 __be32 remote_id = timewait_info->work.remote_id;
694
695 while (*link) {
696 parent = *link;
697 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
698 remote_id_node);
699 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
700 link = &(*link)->rb_left;
701 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
702 link = &(*link)->rb_right;
703 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
704 link = &(*link)->rb_left;
705 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
706 link = &(*link)->rb_right;
707 else
708 return cur_timewait_info;
709 }
710 timewait_info->inserted_remote_id = 1;
711 rb_link_node(&timewait_info->remote_id_node, parent, link);
712 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
713 return NULL;
714}
715
716static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid,
717 __be32 remote_id)
718{
719 struct rb_node *node = cm.remote_id_table.rb_node;
720 struct cm_timewait_info *timewait_info;
721 struct cm_id_private *res = NULL;
722
723 spin_lock_irq(&cm.lock);
724 while (node) {
725 timewait_info = rb_entry(node, struct cm_timewait_info,
726 remote_id_node);
727 if (be32_lt(remote_id, timewait_info->work.remote_id))
728 node = node->rb_left;
729 else if (be32_gt(remote_id, timewait_info->work.remote_id))
730 node = node->rb_right;
731 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
732 node = node->rb_left;
733 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
734 node = node->rb_right;
735 else {
736 res = cm_acquire_id(timewait_info->work.local_id,
737 timewait_info->work.remote_id);
738 break;
739 }
740 }
741 spin_unlock_irq(&cm.lock);
742 return res;
743}
744
745static struct cm_timewait_info *
746cm_insert_remote_qpn(struct cm_timewait_info *timewait_info)
747{
748 struct rb_node **link = &cm.remote_qp_table.rb_node;
749 struct rb_node *parent = NULL;
750 struct cm_timewait_info *cur_timewait_info;
751 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
752 __be32 remote_qpn = timewait_info->remote_qpn;
753
754 while (*link) {
755 parent = *link;
756 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
757 remote_qp_node);
758 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
759 link = &(*link)->rb_left;
760 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
761 link = &(*link)->rb_right;
762 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
763 link = &(*link)->rb_left;
764 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
765 link = &(*link)->rb_right;
766 else
767 return cur_timewait_info;
768 }
769 timewait_info->inserted_remote_qp = 1;
770 rb_link_node(&timewait_info->remote_qp_node, parent, link);
771 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
772 return NULL;
773}
774
775static struct cm_id_private *
776cm_insert_remote_sidr(struct cm_id_private *cm_id_priv)
777{
778 struct rb_node **link = &cm.remote_sidr_table.rb_node;
779 struct rb_node *parent = NULL;
780 struct cm_id_private *cur_cm_id_priv;
781 __be32 remote_id = cm_id_priv->id.remote_id;
782
783 while (*link) {
784 parent = *link;
785 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
786 sidr_id_node);
787 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
788 link = &(*link)->rb_left;
789 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
790 link = &(*link)->rb_right;
791 else {
792 if (cur_cm_id_priv->sidr_slid < cm_id_priv->sidr_slid)
793 link = &(*link)->rb_left;
794 else if (cur_cm_id_priv->sidr_slid > cm_id_priv->sidr_slid)
795 link = &(*link)->rb_right;
796 else
797 return cur_cm_id_priv;
798 }
799 }
800 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
801 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
802 return NULL;
803}
804
805static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device,
806 ib_cm_handler cm_handler,
807 void *context)
808{
809 struct cm_id_private *cm_id_priv;
810 u32 id;
811 int ret;
812
813 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
814 if (!cm_id_priv)
815 return ERR_PTR(-ENOMEM);
816
817 cm_id_priv->id.state = IB_CM_IDLE;
818 cm_id_priv->id.device = device;
819 cm_id_priv->id.cm_handler = cm_handler;
820 cm_id_priv->id.context = context;
821 cm_id_priv->id.remote_cm_qpn = 1;
822
823 RB_CLEAR_NODE(&cm_id_priv->service_node);
824 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
825 spin_lock_init(&cm_id_priv->lock);
826 init_completion(&cm_id_priv->comp);
827 INIT_LIST_HEAD(&cm_id_priv->work_list);
828 atomic_set(&cm_id_priv->work_count, -1);
829 refcount_set(&cm_id_priv->refcount, 1);
830
831 ret = xa_alloc_cyclic(&cm.local_id_table, &id, NULL, xa_limit_32b,
832 &cm.local_id_next, GFP_KERNEL);
833 if (ret < 0)
834 goto error;
835 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
836
837 return cm_id_priv;
838
839error:
840 kfree(cm_id_priv);
841 return ERR_PTR(ret);
842}
843
844/*
845 * Make the ID visible to the MAD handlers and other threads that use the
846 * xarray.
847 */
848static void cm_finalize_id(struct cm_id_private *cm_id_priv)
849{
850 xa_store(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id),
851 cm_id_priv, GFP_ATOMIC);
852}
853
854struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
855 ib_cm_handler cm_handler,
856 void *context)
857{
858 struct cm_id_private *cm_id_priv;
859
860 cm_id_priv = cm_alloc_id_priv(device, cm_handler, context);
861 if (IS_ERR(cm_id_priv))
862 return ERR_CAST(cm_id_priv);
863
864 cm_finalize_id(cm_id_priv);
865 return &cm_id_priv->id;
866}
867EXPORT_SYMBOL(ib_create_cm_id);
868
869static struct cm_work *cm_dequeue_work(struct cm_id_private *cm_id_priv)
870{
871 struct cm_work *work;
872
873 if (list_empty(&cm_id_priv->work_list))
874 return NULL;
875
876 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
877 list_del(&work->list);
878 return work;
879}
880
881static void cm_free_work(struct cm_work *work)
882{
883 if (work->mad_recv_wc)
884 ib_free_recv_mad(work->mad_recv_wc);
885 kfree(work);
886}
887
888static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv,
889 struct cm_work *work)
890 __releases(&cm_id_priv->lock)
891{
892 bool immediate;
893
894 /*
895 * To deliver the event to the user callback we have the drop the
896 * spinlock, however, we need to ensure that the user callback is single
897 * threaded and receives events in the temporal order. If there are
898 * already events being processed then thread new events onto a list,
899 * the thread currently processing will pick them up.
900 */
901 immediate = atomic_inc_and_test(&cm_id_priv->work_count);
902 if (!immediate) {
903 list_add_tail(&work->list, &cm_id_priv->work_list);
904 /*
905 * This routine always consumes incoming reference. Once queued
906 * to the work_list then a reference is held by the thread
907 * currently running cm_process_work() and this reference is not
908 * needed.
909 */
910 cm_deref_id(cm_id_priv);
911 }
912 spin_unlock_irq(&cm_id_priv->lock);
913
914 if (immediate)
915 cm_process_work(cm_id_priv, work);
916}
917
918static inline int cm_convert_to_ms(int iba_time)
919{
920 /* approximate conversion to ms from 4.096us x 2^iba_time */
921 return 1 << max(iba_time - 8, 0);
922}
923
924/*
925 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
926 * Because of how ack_timeout is stored, adding one doubles the timeout.
927 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
928 * increment it (round up) only if the other is within 50%.
929 */
930static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
931{
932 int ack_timeout = packet_life_time + 1;
933
934 if (ack_timeout >= ca_ack_delay)
935 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
936 else
937 ack_timeout = ca_ack_delay +
938 (ack_timeout >= (ca_ack_delay - 1));
939
940 return min(31, ack_timeout);
941}
942
943static void cm_remove_remote(struct cm_id_private *cm_id_priv)
944{
945 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info;
946
947 if (timewait_info->inserted_remote_id) {
948 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
949 timewait_info->inserted_remote_id = 0;
950 }
951
952 if (timewait_info->inserted_remote_qp) {
953 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
954 timewait_info->inserted_remote_qp = 0;
955 }
956}
957
958static struct cm_timewait_info *cm_create_timewait_info(__be32 local_id)
959{
960 struct cm_timewait_info *timewait_info;
961
962 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
963 if (!timewait_info)
964 return ERR_PTR(-ENOMEM);
965
966 timewait_info->work.local_id = local_id;
967 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
968 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
969 return timewait_info;
970}
971
972static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
973{
974 int wait_time;
975 unsigned long flags;
976 struct cm_device *cm_dev;
977
978 lockdep_assert_held(&cm_id_priv->lock);
979
980 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
981 if (!cm_dev)
982 return;
983
984 spin_lock_irqsave(&cm.lock, flags);
985 cm_remove_remote(cm_id_priv);
986 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
987 spin_unlock_irqrestore(&cm.lock, flags);
988
989 /*
990 * The cm_id could be destroyed by the user before we exit timewait.
991 * To protect against this, we search for the cm_id after exiting
992 * timewait before notifying the user that we've exited timewait.
993 */
994 cm_id_priv->id.state = IB_CM_TIMEWAIT;
995 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
996
997 /* Check if the device started its remove_one */
998 spin_lock_irqsave(&cm.lock, flags);
999 if (!cm_dev->going_down)
1000 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
1001 msecs_to_jiffies(wait_time));
1002 spin_unlock_irqrestore(&cm.lock, flags);
1003
1004 /*
1005 * The timewait_info is converted into a work and gets freed during
1006 * cm_free_work() in cm_timewait_handler().
1007 */
1008 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0);
1009 cm_id_priv->timewait_info = NULL;
1010}
1011
1012static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1013{
1014 unsigned long flags;
1015
1016 lockdep_assert_held(&cm_id_priv->lock);
1017
1018 cm_id_priv->id.state = IB_CM_IDLE;
1019 if (cm_id_priv->timewait_info) {
1020 spin_lock_irqsave(&cm.lock, flags);
1021 cm_remove_remote(cm_id_priv);
1022 spin_unlock_irqrestore(&cm.lock, flags);
1023 kfree(cm_id_priv->timewait_info);
1024 cm_id_priv->timewait_info = NULL;
1025 }
1026}
1027
1028static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1029{
1030 struct cm_id_private *cm_id_priv;
1031 struct cm_work *work;
1032
1033 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1034 spin_lock_irq(&cm_id_priv->lock);
1035retest:
1036 switch (cm_id->state) {
1037 case IB_CM_LISTEN:
1038 spin_lock(&cm.lock);
1039 if (--cm_id_priv->listen_sharecount > 0) {
1040 /* The id is still shared. */
1041 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1);
1042 spin_unlock(&cm.lock);
1043 spin_unlock_irq(&cm_id_priv->lock);
1044 cm_deref_id(cm_id_priv);
1045 return;
1046 }
1047 cm_id->state = IB_CM_IDLE;
1048 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1049 RB_CLEAR_NODE(&cm_id_priv->service_node);
1050 spin_unlock(&cm.lock);
1051 break;
1052 case IB_CM_SIDR_REQ_SENT:
1053 cm_id->state = IB_CM_IDLE;
1054 ib_cancel_mad(cm_id_priv->msg);
1055 break;
1056 case IB_CM_SIDR_REQ_RCVD:
1057 cm_send_sidr_rep_locked(cm_id_priv,
1058 &(struct ib_cm_sidr_rep_param){
1059 .status = IB_SIDR_REJECT });
1060 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */
1061 cm_id->state = IB_CM_IDLE;
1062 break;
1063 case IB_CM_REQ_SENT:
1064 case IB_CM_MRA_REQ_RCVD:
1065 ib_cancel_mad(cm_id_priv->msg);
1066 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT,
1067 &cm_id_priv->id.device->node_guid,
1068 sizeof(cm_id_priv->id.device->node_guid),
1069 NULL, 0);
1070 break;
1071 case IB_CM_REQ_RCVD:
1072 if (err == -ENOMEM) {
1073 /* Do not reject to allow future retries. */
1074 cm_reset_to_idle(cm_id_priv);
1075 } else {
1076 cm_send_rej_locked(cm_id_priv,
1077 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
1078 NULL, 0);
1079 }
1080 break;
1081 case IB_CM_REP_SENT:
1082 case IB_CM_MRA_REP_RCVD:
1083 ib_cancel_mad(cm_id_priv->msg);
1084 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1085 0, NULL, 0);
1086 goto retest;
1087 case IB_CM_MRA_REQ_SENT:
1088 case IB_CM_REP_RCVD:
1089 case IB_CM_MRA_REP_SENT:
1090 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1091 0, NULL, 0);
1092 break;
1093 case IB_CM_ESTABLISHED:
1094 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
1095 cm_id->state = IB_CM_IDLE;
1096 break;
1097 }
1098 cm_send_dreq_locked(cm_id_priv, NULL, 0);
1099 goto retest;
1100 case IB_CM_DREQ_SENT:
1101 ib_cancel_mad(cm_id_priv->msg);
1102 cm_enter_timewait(cm_id_priv);
1103 goto retest;
1104 case IB_CM_DREQ_RCVD:
1105 cm_send_drep_locked(cm_id_priv, NULL, 0);
1106 WARN_ON(cm_id->state != IB_CM_TIMEWAIT);
1107 goto retest;
1108 case IB_CM_TIMEWAIT:
1109 /*
1110 * The cm_acquire_id in cm_timewait_handler will stop working
1111 * once we do xa_erase below, so just move to idle here for
1112 * consistency.
1113 */
1114 cm_id->state = IB_CM_IDLE;
1115 break;
1116 case IB_CM_IDLE:
1117 break;
1118 }
1119 WARN_ON(cm_id->state != IB_CM_IDLE);
1120
1121 spin_lock(&cm.lock);
1122 /* Required for cleanup paths related cm_req_handler() */
1123 if (cm_id_priv->timewait_info) {
1124 cm_remove_remote(cm_id_priv);
1125 kfree(cm_id_priv->timewait_info);
1126 cm_id_priv->timewait_info = NULL;
1127 }
1128
1129 WARN_ON(cm_id_priv->listen_sharecount);
1130 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node));
1131 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1132 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
1133 spin_unlock(&cm.lock);
1134 spin_unlock_irq(&cm_id_priv->lock);
1135
1136 xa_erase(&cm.local_id_table, cm_local_id(cm_id->local_id));
1137 cm_deref_id(cm_id_priv);
1138 wait_for_completion(&cm_id_priv->comp);
1139 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1140 cm_free_work(work);
1141
1142 cm_destroy_av(&cm_id_priv->av);
1143 cm_destroy_av(&cm_id_priv->alt_av);
1144 kfree(cm_id_priv->private_data);
1145 kfree_rcu(cm_id_priv, rcu);
1146}
1147
1148void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1149{
1150 cm_destroy_id(cm_id, 0);
1151}
1152EXPORT_SYMBOL(ib_destroy_cm_id);
1153
1154static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id)
1155{
1156 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1157 (service_id != IB_CM_ASSIGN_SERVICE_ID))
1158 return -EINVAL;
1159
1160 if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1161 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++);
1162 else
1163 cm_id_priv->id.service_id = service_id;
1164
1165 return 0;
1166}
1167
1168/**
1169 * ib_cm_listen - Initiates listening on the specified service ID for
1170 * connection and service ID resolution requests.
1171 * @cm_id: Connection identifier associated with the listen request.
1172 * @service_id: Service identifier matched against incoming connection
1173 * and service ID resolution requests. The service ID should be specified
1174 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1175 * assign a service ID to the caller.
1176 */
1177int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id)
1178{
1179 struct cm_id_private *cm_id_priv =
1180 container_of(cm_id, struct cm_id_private, id);
1181 unsigned long flags;
1182 int ret;
1183
1184 spin_lock_irqsave(&cm_id_priv->lock, flags);
1185 if (cm_id_priv->id.state != IB_CM_IDLE) {
1186 ret = -EINVAL;
1187 goto out;
1188 }
1189
1190 ret = cm_init_listen(cm_id_priv, service_id);
1191 if (ret)
1192 goto out;
1193
1194 if (!cm_insert_listen(cm_id_priv, NULL)) {
1195 ret = -EBUSY;
1196 goto out;
1197 }
1198
1199 cm_id_priv->id.state = IB_CM_LISTEN;
1200 ret = 0;
1201
1202out:
1203 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1204 return ret;
1205}
1206EXPORT_SYMBOL(ib_cm_listen);
1207
1208/**
1209 * ib_cm_insert_listen - Create a new listening ib_cm_id and listen on
1210 * the given service ID.
1211 *
1212 * If there's an existing ID listening on that same device and service ID,
1213 * return it.
1214 *
1215 * @device: Device associated with the cm_id. All related communication will
1216 * be associated with the specified device.
1217 * @cm_handler: Callback invoked to notify the user of CM events.
1218 * @service_id: Service identifier matched against incoming connection
1219 * and service ID resolution requests. The service ID should be specified
1220 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1221 * assign a service ID to the caller.
1222 *
1223 * Callers should call ib_destroy_cm_id when done with the listener ID.
1224 */
1225struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1226 ib_cm_handler cm_handler,
1227 __be64 service_id)
1228{
1229 struct cm_id_private *listen_id_priv;
1230 struct cm_id_private *cm_id_priv;
1231 int err = 0;
1232
1233 /* Create an ID in advance, since the creation may sleep */
1234 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL);
1235 if (IS_ERR(cm_id_priv))
1236 return ERR_CAST(cm_id_priv);
1237
1238 err = cm_init_listen(cm_id_priv, service_id);
1239 if (err) {
1240 ib_destroy_cm_id(&cm_id_priv->id);
1241 return ERR_PTR(err);
1242 }
1243
1244 spin_lock_irq(&cm_id_priv->lock);
1245 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler);
1246 if (listen_id_priv != cm_id_priv) {
1247 spin_unlock_irq(&cm_id_priv->lock);
1248 ib_destroy_cm_id(&cm_id_priv->id);
1249 if (!listen_id_priv)
1250 return ERR_PTR(-EINVAL);
1251 return &listen_id_priv->id;
1252 }
1253 cm_id_priv->id.state = IB_CM_LISTEN;
1254 spin_unlock_irq(&cm_id_priv->lock);
1255
1256 /*
1257 * A listen ID does not need to be in the xarray since it does not
1258 * receive mads, is not placed in the remote_id or remote_qpn rbtree,
1259 * and does not enter timewait.
1260 */
1261
1262 return &cm_id_priv->id;
1263}
1264EXPORT_SYMBOL(ib_cm_insert_listen);
1265
1266static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1267{
1268 u64 hi_tid = 0, low_tid;
1269
1270 lockdep_assert_held(&cm_id_priv->lock);
1271
1272 low_tid = (u64)cm_id_priv->id.local_id;
1273 if (!cm_id_priv->av.port)
1274 return cpu_to_be64(low_tid);
1275
1276 spin_lock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
1277 if (cm_id_priv->av.port->mad_agent)
1278 hi_tid = ((u64)cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1279 spin_unlock(&cm_id_priv->av.port->cm_dev->mad_agent_lock);
1280 return cpu_to_be64(hi_tid | low_tid);
1281}
1282
1283static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1284 __be16 attr_id, __be64 tid)
1285{
1286 hdr->base_version = IB_MGMT_BASE_VERSION;
1287 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1288 hdr->class_version = IB_CM_CLASS_VERSION;
1289 hdr->method = IB_MGMT_METHOD_SEND;
1290 hdr->attr_id = attr_id;
1291 hdr->tid = tid;
1292}
1293
1294static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id,
1295 __be64 tid, u32 attr_mod)
1296{
1297 cm_format_mad_hdr(hdr, attr_id, tid);
1298 hdr->attr_mod = cpu_to_be32(attr_mod);
1299}
1300
1301static void cm_format_req(struct cm_req_msg *req_msg,
1302 struct cm_id_private *cm_id_priv,
1303 struct ib_cm_req_param *param)
1304{
1305 struct sa_path_rec *pri_path = param->primary_path;
1306 struct sa_path_rec *alt_path = param->alternate_path;
1307 bool pri_ext = false;
1308 __be16 lid;
1309
1310 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1311 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1312 pri_path->opa.slid);
1313
1314 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1315 cm_form_tid(cm_id_priv), param->ece.attr_mod);
1316
1317 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg,
1318 be32_to_cpu(cm_id_priv->id.local_id));
1319 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id));
1320 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg,
1321 be64_to_cpu(cm_id_priv->id.device->node_guid));
1322 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num);
1323 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth);
1324 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg,
1325 param->remote_cm_response_timeout);
1326 cm_req_set_qp_type(req_msg, param->qp_type);
1327 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control);
1328 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn);
1329 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg,
1330 param->local_cm_response_timeout);
1331 IBA_SET(CM_REQ_PARTITION_KEY, req_msg,
1332 be16_to_cpu(param->primary_path->pkey));
1333 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg,
1334 param->primary_path->mtu);
1335 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries);
1336
1337 if (param->qp_type != IB_QPT_XRC_INI) {
1338 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg,
1339 param->responder_resources);
1340 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count);
1341 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg,
1342 param->rnr_retry_count);
1343 IBA_SET(CM_REQ_SRQ, req_msg, param->srq);
1344 }
1345
1346 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) =
1347 pri_path->sgid;
1348 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) =
1349 pri_path->dgid;
1350 if (pri_ext) {
1351 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)
1352 ->global.interface_id =
1353 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1354 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)
1355 ->global.interface_id =
1356 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1357 }
1358 if (pri_path->hop_limit <= 1) {
1359 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1360 be16_to_cpu(pri_ext ? 0 :
1361 htons(ntohl(sa_path_get_slid(
1362 pri_path)))));
1363 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1364 be16_to_cpu(pri_ext ? 0 :
1365 htons(ntohl(sa_path_get_dlid(
1366 pri_path)))));
1367 } else {
1368
1369 if (param->primary_path_inbound) {
1370 lid = param->primary_path_inbound->ib.dlid;
1371 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1372 be16_to_cpu(lid));
1373 } else
1374 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1375 be16_to_cpu(IB_LID_PERMISSIVE));
1376
1377 /* Work-around until there's a way to obtain remote LID info */
1378 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1379 be16_to_cpu(IB_LID_PERMISSIVE));
1380 }
1381 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg,
1382 be32_to_cpu(pri_path->flow_label));
1383 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate);
1384 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class);
1385 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit);
1386 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl);
1387 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg,
1388 (pri_path->hop_limit <= 1));
1389 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg,
1390 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1391 pri_path->packet_life_time));
1392
1393 if (alt_path) {
1394 bool alt_ext = false;
1395
1396 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1397 alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1398 alt_path->opa.slid);
1399
1400 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) =
1401 alt_path->sgid;
1402 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) =
1403 alt_path->dgid;
1404 if (alt_ext) {
1405 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1406 req_msg)
1407 ->global.interface_id =
1408 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1409 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID,
1410 req_msg)
1411 ->global.interface_id =
1412 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1413 }
1414 if (alt_path->hop_limit <= 1) {
1415 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1416 be16_to_cpu(
1417 alt_ext ? 0 :
1418 htons(ntohl(sa_path_get_slid(
1419 alt_path)))));
1420 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1421 be16_to_cpu(
1422 alt_ext ? 0 :
1423 htons(ntohl(sa_path_get_dlid(
1424 alt_path)))));
1425 } else {
1426 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1427 be16_to_cpu(IB_LID_PERMISSIVE));
1428 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1429 be16_to_cpu(IB_LID_PERMISSIVE));
1430 }
1431 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg,
1432 be32_to_cpu(alt_path->flow_label));
1433 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate);
1434 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg,
1435 alt_path->traffic_class);
1436 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg,
1437 alt_path->hop_limit);
1438 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl);
1439 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg,
1440 (alt_path->hop_limit <= 1));
1441 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg,
1442 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1443 alt_path->packet_life_time));
1444 }
1445 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id);
1446
1447 if (param->private_data && param->private_data_len)
1448 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data,
1449 param->private_data_len);
1450}
1451
1452static int cm_validate_req_param(struct ib_cm_req_param *param)
1453{
1454 if (!param->primary_path)
1455 return -EINVAL;
1456
1457 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1458 param->qp_type != IB_QPT_XRC_INI)
1459 return -EINVAL;
1460
1461 if (param->private_data &&
1462 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1463 return -EINVAL;
1464
1465 if (param->alternate_path &&
1466 (param->alternate_path->pkey != param->primary_path->pkey ||
1467 param->alternate_path->mtu != param->primary_path->mtu))
1468 return -EINVAL;
1469
1470 return 0;
1471}
1472
1473int ib_send_cm_req(struct ib_cm_id *cm_id,
1474 struct ib_cm_req_param *param)
1475{
1476 struct cm_av av = {}, alt_av = {};
1477 struct cm_id_private *cm_id_priv;
1478 struct ib_mad_send_buf *msg;
1479 struct cm_req_msg *req_msg;
1480 unsigned long flags;
1481 int ret;
1482
1483 ret = cm_validate_req_param(param);
1484 if (ret)
1485 return ret;
1486
1487 /* Verify that we're not in timewait. */
1488 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1489 spin_lock_irqsave(&cm_id_priv->lock, flags);
1490 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) {
1491 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1492 return -EINVAL;
1493 }
1494 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1495
1496 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1497 id.local_id);
1498 if (IS_ERR(cm_id_priv->timewait_info)) {
1499 ret = PTR_ERR(cm_id_priv->timewait_info);
1500 cm_id_priv->timewait_info = NULL;
1501 return ret;
1502 }
1503
1504 ret = cm_init_av_by_path(param->primary_path,
1505 param->ppath_sgid_attr, &av);
1506 if (ret)
1507 return ret;
1508 if (param->alternate_path) {
1509 ret = cm_init_av_by_path(param->alternate_path, NULL,
1510 &alt_av);
1511 if (ret) {
1512 cm_destroy_av(&av);
1513 return ret;
1514 }
1515 }
1516 cm_id->service_id = param->service_id;
1517 cm_id_priv->timeout_ms = cm_convert_to_ms(
1518 param->primary_path->packet_life_time) * 2 +
1519 cm_convert_to_ms(
1520 param->remote_cm_response_timeout);
1521 cm_id_priv->max_cm_retries = param->max_cm_retries;
1522 cm_id_priv->initiator_depth = param->initiator_depth;
1523 cm_id_priv->responder_resources = param->responder_resources;
1524 cm_id_priv->retry_count = param->retry_count;
1525 cm_id_priv->path_mtu = param->primary_path->mtu;
1526 cm_id_priv->pkey = param->primary_path->pkey;
1527 cm_id_priv->qp_type = param->qp_type;
1528
1529 spin_lock_irqsave(&cm_id_priv->lock, flags);
1530
1531 cm_move_av_from_path(&cm_id_priv->av, &av);
1532 if (param->primary_path_outbound)
1533 cm_id_priv->av.dlid_datapath =
1534 be16_to_cpu(param->primary_path_outbound->ib.dlid);
1535
1536 if (param->alternate_path)
1537 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av);
1538
1539 msg = cm_alloc_priv_msg(cm_id_priv);
1540 if (IS_ERR(msg)) {
1541 ret = PTR_ERR(msg);
1542 goto out_unlock;
1543 }
1544
1545 req_msg = (struct cm_req_msg *)msg->mad;
1546 cm_format_req(req_msg, cm_id_priv, param);
1547 cm_id_priv->tid = req_msg->hdr.tid;
1548 msg->timeout_ms = cm_id_priv->timeout_ms;
1549 msg->context[1] = (void *)(unsigned long)IB_CM_REQ_SENT;
1550
1551 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
1552 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
1553
1554 trace_icm_send_req(&cm_id_priv->id);
1555 ret = ib_post_send_mad(msg, NULL);
1556 if (ret)
1557 goto out_free;
1558 BUG_ON(cm_id->state != IB_CM_IDLE);
1559 cm_id->state = IB_CM_REQ_SENT;
1560 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1561 return 0;
1562out_free:
1563 cm_free_priv_msg(msg);
1564out_unlock:
1565 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1566 return ret;
1567}
1568EXPORT_SYMBOL(ib_send_cm_req);
1569
1570static int cm_issue_rej(struct cm_port *port,
1571 struct ib_mad_recv_wc *mad_recv_wc,
1572 enum ib_cm_rej_reason reason,
1573 enum cm_msg_response msg_rejected,
1574 void *ari, u8 ari_length)
1575{
1576 struct ib_mad_send_buf *msg = NULL;
1577 struct cm_rej_msg *rej_msg, *rcv_msg;
1578 int ret;
1579
1580 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1581 if (ret)
1582 return ret;
1583
1584 /* We just need common CM header information. Cast to any message. */
1585 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1586 rej_msg = (struct cm_rej_msg *) msg->mad;
1587
1588 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1589 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1590 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg));
1591 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1592 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1593 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected);
1594 IBA_SET(CM_REJ_REASON, rej_msg, reason);
1595
1596 if (ari && ari_length) {
1597 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1598 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1599 }
1600
1601 trace_icm_issue_rej(
1602 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg),
1603 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1604 ret = ib_post_send_mad(msg, NULL);
1605 if (ret)
1606 cm_free_response_msg(msg);
1607
1608 return ret;
1609}
1610
1611static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1612{
1613 return ((cpu_to_be16(
1614 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) ||
1615 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1616 req_msg))));
1617}
1618
1619static void cm_path_set_rec_type(struct ib_device *ib_device, u32 port_num,
1620 struct sa_path_rec *path, union ib_gid *gid)
1621{
1622 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1623 path->rec_type = SA_PATH_REC_TYPE_OPA;
1624 else
1625 path->rec_type = SA_PATH_REC_TYPE_IB;
1626}
1627
1628static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1629 struct sa_path_rec *primary_path,
1630 struct sa_path_rec *alt_path,
1631 struct ib_wc *wc)
1632{
1633 u32 lid;
1634
1635 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1636 sa_path_set_dlid(primary_path, wc->slid);
1637 sa_path_set_slid(primary_path,
1638 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
1639 req_msg));
1640 } else {
1641 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1642 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg));
1643 sa_path_set_dlid(primary_path, lid);
1644
1645 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1646 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg));
1647 sa_path_set_slid(primary_path, lid);
1648 }
1649
1650 if (!cm_req_has_alt_path(req_msg))
1651 return;
1652
1653 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1654 sa_path_set_dlid(alt_path,
1655 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
1656 req_msg));
1657 sa_path_set_slid(alt_path,
1658 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
1659 req_msg));
1660 } else {
1661 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1662 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg));
1663 sa_path_set_dlid(alt_path, lid);
1664
1665 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1666 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg));
1667 sa_path_set_slid(alt_path, lid);
1668 }
1669}
1670
1671static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1672 struct sa_path_rec *primary_path,
1673 struct sa_path_rec *alt_path,
1674 struct ib_wc *wc)
1675{
1676 primary_path->dgid =
1677 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg);
1678 primary_path->sgid =
1679 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg);
1680 primary_path->flow_label =
1681 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg));
1682 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg);
1683 primary_path->traffic_class =
1684 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg);
1685 primary_path->reversible = 1;
1686 primary_path->pkey =
1687 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1688 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg);
1689 primary_path->mtu_selector = IB_SA_EQ;
1690 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1691 primary_path->rate_selector = IB_SA_EQ;
1692 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg);
1693 primary_path->packet_life_time_selector = IB_SA_EQ;
1694 primary_path->packet_life_time =
1695 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg);
1696 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1697 primary_path->service_id =
1698 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1699 if (sa_path_is_roce(primary_path))
1700 primary_path->roce.route_resolved = false;
1701
1702 if (cm_req_has_alt_path(req_msg)) {
1703 alt_path->dgid = *IBA_GET_MEM_PTR(
1704 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg);
1705 alt_path->sgid = *IBA_GET_MEM_PTR(
1706 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg);
1707 alt_path->flow_label = cpu_to_be32(
1708 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg));
1709 alt_path->hop_limit =
1710 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg);
1711 alt_path->traffic_class =
1712 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg);
1713 alt_path->reversible = 1;
1714 alt_path->pkey =
1715 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1716 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg);
1717 alt_path->mtu_selector = IB_SA_EQ;
1718 alt_path->mtu =
1719 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1720 alt_path->rate_selector = IB_SA_EQ;
1721 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg);
1722 alt_path->packet_life_time_selector = IB_SA_EQ;
1723 alt_path->packet_life_time =
1724 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg);
1725 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1726 alt_path->service_id =
1727 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1728
1729 if (sa_path_is_roce(alt_path))
1730 alt_path->roce.route_resolved = false;
1731 }
1732 cm_format_path_lid_from_req(req_msg, primary_path, alt_path, wc);
1733}
1734
1735static u16 cm_get_bth_pkey(struct cm_work *work)
1736{
1737 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1738 u32 port_num = work->port->port_num;
1739 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1740 u16 pkey;
1741 int ret;
1742
1743 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1744 if (ret) {
1745 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %u, pkey index %u). %d\n",
1746 port_num, pkey_index, ret);
1747 return 0;
1748 }
1749
1750 return pkey;
1751}
1752
1753/**
1754 * cm_opa_to_ib_sgid - Convert OPA SGID to IB SGID
1755 * ULPs (such as IPoIB) do not understand OPA GIDs and will
1756 * reject them as the local_gid will not match the sgid. Therefore,
1757 * change the pathrec's SGID to an IB SGID.
1758 *
1759 * @work: Work completion
1760 * @path: Path record
1761 */
1762static void cm_opa_to_ib_sgid(struct cm_work *work,
1763 struct sa_path_rec *path)
1764{
1765 struct ib_device *dev = work->port->cm_dev->ib_device;
1766 u32 port_num = work->port->port_num;
1767
1768 if (rdma_cap_opa_ah(dev, port_num) &&
1769 (ib_is_opa_gid(&path->sgid))) {
1770 union ib_gid sgid;
1771
1772 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1773 dev_warn(&dev->dev,
1774 "Error updating sgid in CM request\n");
1775 return;
1776 }
1777
1778 path->sgid = sgid;
1779 }
1780}
1781
1782static void cm_format_req_event(struct cm_work *work,
1783 struct cm_id_private *cm_id_priv,
1784 struct ib_cm_id *listen_id)
1785{
1786 struct cm_req_msg *req_msg;
1787 struct ib_cm_req_event_param *param;
1788
1789 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1790 param = &work->cm_event.param.req_rcvd;
1791 param->listen_id = listen_id;
1792 param->bth_pkey = cm_get_bth_pkey(work);
1793 param->port = cm_id_priv->av.port->port_num;
1794 param->primary_path = &work->path[0];
1795 cm_opa_to_ib_sgid(work, param->primary_path);
1796 if (cm_req_has_alt_path(req_msg)) {
1797 param->alternate_path = &work->path[1];
1798 cm_opa_to_ib_sgid(work, param->alternate_path);
1799 } else {
1800 param->alternate_path = NULL;
1801 }
1802 param->remote_ca_guid =
1803 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
1804 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg);
1805 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg);
1806 param->qp_type = cm_req_get_qp_type(req_msg);
1807 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg);
1808 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
1809 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
1810 param->local_cm_response_timeout =
1811 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg);
1812 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg);
1813 param->remote_cm_response_timeout =
1814 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg);
1815 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
1816 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
1817 param->srq = IBA_GET(CM_REQ_SRQ, req_msg);
1818 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1819 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg);
1820 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod);
1821
1822 work->cm_event.private_data =
1823 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg);
1824}
1825
1826static void cm_process_work(struct cm_id_private *cm_id_priv,
1827 struct cm_work *work)
1828{
1829 int ret;
1830
1831 /* We will typically only have the current event to report. */
1832 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1833 cm_free_work(work);
1834
1835 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1836 spin_lock_irq(&cm_id_priv->lock);
1837 work = cm_dequeue_work(cm_id_priv);
1838 spin_unlock_irq(&cm_id_priv->lock);
1839 if (!work)
1840 return;
1841
1842 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1843 &work->cm_event);
1844 cm_free_work(work);
1845 }
1846 cm_deref_id(cm_id_priv);
1847 if (ret)
1848 cm_destroy_id(&cm_id_priv->id, ret);
1849}
1850
1851static void cm_format_mra(struct cm_mra_msg *mra_msg,
1852 struct cm_id_private *cm_id_priv,
1853 enum cm_msg_response msg_mraed, u8 service_timeout,
1854 const void *private_data, u8 private_data_len)
1855{
1856 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1857 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed);
1858 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg,
1859 be32_to_cpu(cm_id_priv->id.local_id));
1860 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg,
1861 be32_to_cpu(cm_id_priv->id.remote_id));
1862 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout);
1863
1864 if (private_data && private_data_len)
1865 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data,
1866 private_data_len);
1867}
1868
1869static void cm_format_rej(struct cm_rej_msg *rej_msg,
1870 struct cm_id_private *cm_id_priv,
1871 enum ib_cm_rej_reason reason, void *ari,
1872 u8 ari_length, const void *private_data,
1873 u8 private_data_len, enum ib_cm_state state)
1874{
1875 lockdep_assert_held(&cm_id_priv->lock);
1876
1877 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1878 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1879 be32_to_cpu(cm_id_priv->id.remote_id));
1880
1881 switch (state) {
1882 case IB_CM_REQ_RCVD:
1883 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0));
1884 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1885 break;
1886 case IB_CM_MRA_REQ_SENT:
1887 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1888 be32_to_cpu(cm_id_priv->id.local_id));
1889 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1890 break;
1891 case IB_CM_REP_RCVD:
1892 case IB_CM_MRA_REP_SENT:
1893 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1894 be32_to_cpu(cm_id_priv->id.local_id));
1895 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP);
1896 break;
1897 default:
1898 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1899 be32_to_cpu(cm_id_priv->id.local_id));
1900 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg,
1901 CM_MSG_RESPONSE_OTHER);
1902 break;
1903 }
1904
1905 IBA_SET(CM_REJ_REASON, rej_msg, reason);
1906 if (ari && ari_length) {
1907 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1908 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1909 }
1910
1911 if (private_data && private_data_len)
1912 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data,
1913 private_data_len);
1914}
1915
1916static void cm_dup_req_handler(struct cm_work *work,
1917 struct cm_id_private *cm_id_priv)
1918{
1919 struct ib_mad_send_buf *msg = NULL;
1920 int ret;
1921
1922 atomic_long_inc(
1923 &work->port->counters[CM_RECV_DUPLICATES][CM_REQ_COUNTER]);
1924
1925 /* Quick state check to discard duplicate REQs. */
1926 spin_lock_irq(&cm_id_priv->lock);
1927 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
1928 spin_unlock_irq(&cm_id_priv->lock);
1929 return;
1930 }
1931 spin_unlock_irq(&cm_id_priv->lock);
1932
1933 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1934 if (ret)
1935 return;
1936
1937 spin_lock_irq(&cm_id_priv->lock);
1938 switch (cm_id_priv->id.state) {
1939 case IB_CM_MRA_REQ_SENT:
1940 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1941 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1942 cm_id_priv->private_data,
1943 cm_id_priv->private_data_len);
1944 break;
1945 case IB_CM_TIMEWAIT:
1946 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv,
1947 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0,
1948 IB_CM_TIMEWAIT);
1949 break;
1950 default:
1951 goto unlock;
1952 }
1953 spin_unlock_irq(&cm_id_priv->lock);
1954
1955 trace_icm_send_dup_req(&cm_id_priv->id);
1956 ret = ib_post_send_mad(msg, NULL);
1957 if (ret)
1958 goto free;
1959 return;
1960
1961unlock: spin_unlock_irq(&cm_id_priv->lock);
1962free: cm_free_response_msg(msg);
1963}
1964
1965static struct cm_id_private *cm_match_req(struct cm_work *work,
1966 struct cm_id_private *cm_id_priv)
1967{
1968 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1969 struct cm_timewait_info *timewait_info;
1970 struct cm_req_msg *req_msg;
1971
1972 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1973
1974 /* Check for possible duplicate REQ. */
1975 spin_lock_irq(&cm.lock);
1976 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1977 if (timewait_info) {
1978 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1979 timewait_info->work.remote_id);
1980 spin_unlock_irq(&cm.lock);
1981 if (cur_cm_id_priv) {
1982 cm_dup_req_handler(work, cur_cm_id_priv);
1983 cm_deref_id(cur_cm_id_priv);
1984 }
1985 return NULL;
1986 }
1987
1988 /* Check for stale connections. */
1989 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1990 if (timewait_info) {
1991 cm_remove_remote(cm_id_priv);
1992 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1993 timewait_info->work.remote_id);
1994
1995 spin_unlock_irq(&cm.lock);
1996 cm_issue_rej(work->port, work->mad_recv_wc,
1997 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1998 NULL, 0);
1999 if (cur_cm_id_priv) {
2000 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2001 cm_deref_id(cur_cm_id_priv);
2002 }
2003 return NULL;
2004 }
2005
2006 /* Find matching listen request. */
2007 listen_cm_id_priv = cm_find_listen(
2008 cm_id_priv->id.device,
2009 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)));
2010 if (!listen_cm_id_priv) {
2011 cm_remove_remote(cm_id_priv);
2012 spin_unlock_irq(&cm.lock);
2013 cm_issue_rej(work->port, work->mad_recv_wc,
2014 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
2015 NULL, 0);
2016 return NULL;
2017 }
2018 spin_unlock_irq(&cm.lock);
2019 return listen_cm_id_priv;
2020}
2021
2022/*
2023 * Work-around for inter-subnet connections. If the LIDs are permissive,
2024 * we need to override the LID/SL data in the REQ with the LID information
2025 * in the work completion.
2026 */
2027static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
2028{
2029 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) {
2030 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
2031 req_msg)) == IB_LID_PERMISSIVE) {
2032 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
2033 be16_to_cpu(ib_lid_be16(wc->slid)));
2034 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl);
2035 }
2036
2037 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
2038 req_msg)) == IB_LID_PERMISSIVE)
2039 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
2040 wc->dlid_path_bits);
2041 }
2042
2043 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) {
2044 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
2045 req_msg)) == IB_LID_PERMISSIVE) {
2046 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
2047 be16_to_cpu(ib_lid_be16(wc->slid)));
2048 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl);
2049 }
2050
2051 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
2052 req_msg)) == IB_LID_PERMISSIVE)
2053 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
2054 wc->dlid_path_bits);
2055 }
2056}
2057
2058static int cm_req_handler(struct cm_work *work)
2059{
2060 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
2061 struct cm_req_msg *req_msg;
2062 const struct ib_global_route *grh;
2063 const struct ib_gid_attr *gid_attr;
2064 int ret;
2065
2066 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
2067
2068 cm_id_priv =
2069 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
2070 if (IS_ERR(cm_id_priv))
2071 return PTR_ERR(cm_id_priv);
2072
2073 cm_id_priv->id.remote_id =
2074 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg));
2075 cm_id_priv->id.service_id =
2076 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
2077 cm_id_priv->tid = req_msg->hdr.tid;
2078 cm_id_priv->timeout_ms = cm_convert_to_ms(
2079 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg));
2080 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg);
2081 cm_id_priv->remote_qpn =
2082 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
2083 cm_id_priv->initiator_depth =
2084 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
2085 cm_id_priv->responder_resources =
2086 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
2087 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
2088 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
2089 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
2090 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
2091 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
2092 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2093
2094 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2095 work->mad_recv_wc->recv_buf.grh,
2096 &cm_id_priv->av);
2097 if (ret)
2098 goto destroy;
2099 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
2100 id.local_id);
2101 if (IS_ERR(cm_id_priv->timewait_info)) {
2102 ret = PTR_ERR(cm_id_priv->timewait_info);
2103 cm_id_priv->timewait_info = NULL;
2104 goto destroy;
2105 }
2106 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id;
2107 cm_id_priv->timewait_info->remote_ca_guid =
2108 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
2109 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn;
2110
2111 /*
2112 * Note that the ID pointer is not in the xarray at this point,
2113 * so this set is only visible to the local thread.
2114 */
2115 cm_id_priv->id.state = IB_CM_REQ_RCVD;
2116
2117 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
2118 if (!listen_cm_id_priv) {
2119 trace_icm_no_listener_err(&cm_id_priv->id);
2120 cm_id_priv->id.state = IB_CM_IDLE;
2121 ret = -EINVAL;
2122 goto destroy;
2123 }
2124
2125 memset(&work->path[0], 0, sizeof(work->path[0]));
2126 if (cm_req_has_alt_path(req_msg))
2127 memset(&work->path[1], 0, sizeof(work->path[1]));
2128 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
2129 gid_attr = grh->sgid_attr;
2130
2131 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE) {
2132 work->path[0].rec_type =
2133 sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
2134 } else {
2135 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
2136 cm_path_set_rec_type(
2137 work->port->cm_dev->ib_device, work->port->port_num,
2138 &work->path[0],
2139 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID,
2140 req_msg));
2141 }
2142 if (cm_req_has_alt_path(req_msg))
2143 work->path[1].rec_type = work->path[0].rec_type;
2144 cm_format_paths_from_req(req_msg, &work->path[0],
2145 &work->path[1], work->mad_recv_wc->wc);
2146 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2147 sa_path_set_dmac(&work->path[0],
2148 cm_id_priv->av.ah_attr.roce.dmac);
2149 work->path[0].hop_limit = grh->hop_limit;
2150
2151 /* This destroy call is needed to pair with cm_init_av_for_response */
2152 cm_destroy_av(&cm_id_priv->av);
2153 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av);
2154 if (ret) {
2155 int err;
2156
2157 err = rdma_query_gid(work->port->cm_dev->ib_device,
2158 work->port->port_num, 0,
2159 &work->path[0].sgid);
2160 if (err)
2161 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2162 NULL, 0, NULL, 0);
2163 else
2164 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2165 &work->path[0].sgid,
2166 sizeof(work->path[0].sgid),
2167 NULL, 0);
2168 goto rejected;
2169 }
2170 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_IB)
2171 cm_id_priv->av.dlid_datapath =
2172 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg);
2173
2174 if (cm_req_has_alt_path(req_msg)) {
2175 ret = cm_init_av_by_path(&work->path[1], NULL,
2176 &cm_id_priv->alt_av);
2177 if (ret) {
2178 ib_send_cm_rej(&cm_id_priv->id,
2179 IB_CM_REJ_INVALID_ALT_GID,
2180 &work->path[0].sgid,
2181 sizeof(work->path[0].sgid), NULL, 0);
2182 goto rejected;
2183 }
2184 }
2185
2186 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
2187 cm_id_priv->id.context = listen_cm_id_priv->id.context;
2188 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2189
2190 /* Now MAD handlers can see the new ID */
2191 spin_lock_irq(&cm_id_priv->lock);
2192 cm_finalize_id(cm_id_priv);
2193
2194 /* Refcount belongs to the event, pairs with cm_process_work() */
2195 refcount_inc(&cm_id_priv->refcount);
2196 cm_queue_work_unlock(cm_id_priv, work);
2197 /*
2198 * Since this ID was just created and was not made visible to other MAD
2199 * handlers until the cm_finalize_id() above we know that the
2200 * cm_process_work() will deliver the event and the listen_cm_id
2201 * embedded in the event can be derefed here.
2202 */
2203 cm_deref_id(listen_cm_id_priv);
2204 return 0;
2205
2206rejected:
2207 cm_deref_id(listen_cm_id_priv);
2208destroy:
2209 ib_destroy_cm_id(&cm_id_priv->id);
2210 return ret;
2211}
2212
2213static void cm_format_rep(struct cm_rep_msg *rep_msg,
2214 struct cm_id_private *cm_id_priv,
2215 struct ib_cm_rep_param *param)
2216{
2217 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid,
2218 param->ece.attr_mod);
2219 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg,
2220 be32_to_cpu(cm_id_priv->id.local_id));
2221 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg,
2222 be32_to_cpu(cm_id_priv->id.remote_id));
2223 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn);
2224 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg,
2225 param->responder_resources);
2226 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg,
2227 cm_id_priv->av.port->cm_dev->ack_delay);
2228 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted);
2229 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count);
2230 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg,
2231 be64_to_cpu(cm_id_priv->id.device->node_guid));
2232
2233 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2234 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg,
2235 param->initiator_depth);
2236 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg,
2237 param->flow_control);
2238 IBA_SET(CM_REP_SRQ, rep_msg, param->srq);
2239 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num);
2240 } else {
2241 IBA_SET(CM_REP_SRQ, rep_msg, 1);
2242 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num);
2243 }
2244
2245 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id);
2246 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8);
2247 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16);
2248
2249 if (param->private_data && param->private_data_len)
2250 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data,
2251 param->private_data_len);
2252}
2253
2254int ib_send_cm_rep(struct ib_cm_id *cm_id,
2255 struct ib_cm_rep_param *param)
2256{
2257 struct cm_id_private *cm_id_priv;
2258 struct ib_mad_send_buf *msg;
2259 struct cm_rep_msg *rep_msg;
2260 unsigned long flags;
2261 int ret;
2262
2263 if (param->private_data &&
2264 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2265 return -EINVAL;
2266
2267 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2268 spin_lock_irqsave(&cm_id_priv->lock, flags);
2269 if (cm_id->state != IB_CM_REQ_RCVD &&
2270 cm_id->state != IB_CM_MRA_REQ_SENT) {
2271 trace_icm_send_rep_err(cm_id_priv->id.local_id, cm_id->state);
2272 ret = -EINVAL;
2273 goto out;
2274 }
2275
2276 msg = cm_alloc_priv_msg(cm_id_priv);
2277 if (IS_ERR(msg)) {
2278 ret = PTR_ERR(msg);
2279 goto out;
2280 }
2281
2282 rep_msg = (struct cm_rep_msg *) msg->mad;
2283 cm_format_rep(rep_msg, cm_id_priv, param);
2284 msg->timeout_ms = cm_id_priv->timeout_ms;
2285 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2286
2287 trace_icm_send_rep(cm_id);
2288 ret = ib_post_send_mad(msg, NULL);
2289 if (ret)
2290 goto out_free;
2291
2292 cm_id->state = IB_CM_REP_SENT;
2293 cm_id_priv->initiator_depth = param->initiator_depth;
2294 cm_id_priv->responder_resources = param->responder_resources;
2295 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2296 WARN_ONCE(param->qp_num & 0xFF000000,
2297 "IBTA declares QPN to be 24 bits, but it is 0x%X\n",
2298 param->qp_num);
2299 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2300 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2301 return 0;
2302
2303out_free:
2304 cm_free_priv_msg(msg);
2305out:
2306 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2307 return ret;
2308}
2309EXPORT_SYMBOL(ib_send_cm_rep);
2310
2311static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2312 struct cm_id_private *cm_id_priv,
2313 const void *private_data,
2314 u8 private_data_len)
2315{
2316 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2317 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg,
2318 be32_to_cpu(cm_id_priv->id.local_id));
2319 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg,
2320 be32_to_cpu(cm_id_priv->id.remote_id));
2321
2322 if (private_data && private_data_len)
2323 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data,
2324 private_data_len);
2325}
2326
2327int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2328 const void *private_data,
2329 u8 private_data_len)
2330{
2331 struct cm_id_private *cm_id_priv;
2332 struct ib_mad_send_buf *msg;
2333 unsigned long flags;
2334 void *data;
2335 int ret;
2336
2337 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2338 return -EINVAL;
2339
2340 data = cm_copy_private_data(private_data, private_data_len);
2341 if (IS_ERR(data))
2342 return PTR_ERR(data);
2343
2344 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2345 spin_lock_irqsave(&cm_id_priv->lock, flags);
2346 if (cm_id->state != IB_CM_REP_RCVD &&
2347 cm_id->state != IB_CM_MRA_REP_SENT) {
2348 trace_icm_send_cm_rtu_err(cm_id);
2349 ret = -EINVAL;
2350 goto error;
2351 }
2352
2353 msg = cm_alloc_msg(cm_id_priv);
2354 if (IS_ERR(msg)) {
2355 ret = PTR_ERR(msg);
2356 goto error;
2357 }
2358
2359 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2360 private_data, private_data_len);
2361
2362 trace_icm_send_rtu(cm_id);
2363 ret = ib_post_send_mad(msg, NULL);
2364 if (ret) {
2365 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2366 cm_free_msg(msg);
2367 kfree(data);
2368 return ret;
2369 }
2370
2371 cm_id->state = IB_CM_ESTABLISHED;
2372 cm_set_private_data(cm_id_priv, data, private_data_len);
2373 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2374 return 0;
2375
2376error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2377 kfree(data);
2378 return ret;
2379}
2380EXPORT_SYMBOL(ib_send_cm_rtu);
2381
2382static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2383{
2384 struct cm_rep_msg *rep_msg;
2385 struct ib_cm_rep_event_param *param;
2386
2387 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2388 param = &work->cm_event.param.rep_rcvd;
2389 param->remote_ca_guid =
2390 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2391 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg);
2392 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2393 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg);
2394 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2395 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2396 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2397 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg);
2398 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg);
2399 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2400 param->srq = IBA_GET(CM_REP_SRQ, rep_msg);
2401 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16;
2402 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8;
2403 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg);
2404 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod);
2405
2406 work->cm_event.private_data =
2407 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg);
2408}
2409
2410static void cm_dup_rep_handler(struct cm_work *work)
2411{
2412 struct cm_id_private *cm_id_priv;
2413 struct cm_rep_msg *rep_msg;
2414 struct ib_mad_send_buf *msg = NULL;
2415 int ret;
2416
2417 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2418 cm_id_priv = cm_acquire_id(
2419 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)),
2420 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)));
2421 if (!cm_id_priv)
2422 return;
2423
2424 atomic_long_inc(
2425 &work->port->counters[CM_RECV_DUPLICATES][CM_REP_COUNTER]);
2426 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2427 if (ret)
2428 goto deref;
2429
2430 spin_lock_irq(&cm_id_priv->lock);
2431 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2432 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2433 cm_id_priv->private_data,
2434 cm_id_priv->private_data_len);
2435 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2436 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2437 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2438 cm_id_priv->private_data,
2439 cm_id_priv->private_data_len);
2440 else
2441 goto unlock;
2442 spin_unlock_irq(&cm_id_priv->lock);
2443
2444 trace_icm_send_dup_rep(&cm_id_priv->id);
2445 ret = ib_post_send_mad(msg, NULL);
2446 if (ret)
2447 goto free;
2448 goto deref;
2449
2450unlock: spin_unlock_irq(&cm_id_priv->lock);
2451free: cm_free_response_msg(msg);
2452deref: cm_deref_id(cm_id_priv);
2453}
2454
2455static int cm_rep_handler(struct cm_work *work)
2456{
2457 struct cm_id_private *cm_id_priv;
2458 struct cm_rep_msg *rep_msg;
2459 int ret;
2460 struct cm_id_private *cur_cm_id_priv;
2461 struct cm_timewait_info *timewait_info;
2462
2463 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2464 cm_id_priv = cm_acquire_id(
2465 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0);
2466 if (!cm_id_priv) {
2467 cm_dup_rep_handler(work);
2468 trace_icm_remote_no_priv_err(
2469 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2470 return -EINVAL;
2471 }
2472
2473 cm_format_rep_event(work, cm_id_priv->qp_type);
2474
2475 spin_lock_irq(&cm_id_priv->lock);
2476 switch (cm_id_priv->id.state) {
2477 case IB_CM_REQ_SENT:
2478 case IB_CM_MRA_REQ_RCVD:
2479 break;
2480 default:
2481 ret = -EINVAL;
2482 trace_icm_rep_unknown_err(
2483 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2484 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg),
2485 cm_id_priv->id.state);
2486 spin_unlock_irq(&cm_id_priv->lock);
2487 goto error;
2488 }
2489
2490 cm_id_priv->timewait_info->work.remote_id =
2491 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2492 cm_id_priv->timewait_info->remote_ca_guid =
2493 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2494 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2495
2496 spin_lock(&cm.lock);
2497 /* Check for duplicate REP. */
2498 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2499 spin_unlock(&cm.lock);
2500 spin_unlock_irq(&cm_id_priv->lock);
2501 ret = -EINVAL;
2502 trace_icm_insert_failed_err(
2503 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2504 goto error;
2505 }
2506 /* Check for a stale connection. */
2507 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2508 if (timewait_info) {
2509 cm_remove_remote(cm_id_priv);
2510 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2511 timewait_info->work.remote_id);
2512
2513 spin_unlock(&cm.lock);
2514 spin_unlock_irq(&cm_id_priv->lock);
2515 cm_issue_rej(work->port, work->mad_recv_wc,
2516 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2517 NULL, 0);
2518 ret = -EINVAL;
2519 trace_icm_staleconn_err(
2520 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2521 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2522
2523 if (cur_cm_id_priv) {
2524 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2525 cm_deref_id(cur_cm_id_priv);
2526 }
2527
2528 goto error;
2529 }
2530 spin_unlock(&cm.lock);
2531
2532 cm_id_priv->id.state = IB_CM_REP_RCVD;
2533 cm_id_priv->id.remote_id =
2534 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2535 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2536 cm_id_priv->initiator_depth =
2537 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2538 cm_id_priv->responder_resources =
2539 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2540 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2541 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2542 cm_id_priv->target_ack_delay =
2543 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2544 cm_id_priv->av.timeout =
2545 cm_ack_timeout(cm_id_priv->target_ack_delay,
2546 cm_id_priv->av.timeout - 1);
2547 cm_id_priv->alt_av.timeout =
2548 cm_ack_timeout(cm_id_priv->target_ack_delay,
2549 cm_id_priv->alt_av.timeout - 1);
2550
2551 ib_cancel_mad(cm_id_priv->msg);
2552 cm_queue_work_unlock(cm_id_priv, work);
2553 return 0;
2554
2555error:
2556 cm_deref_id(cm_id_priv);
2557 return ret;
2558}
2559
2560static int cm_establish_handler(struct cm_work *work)
2561{
2562 struct cm_id_private *cm_id_priv;
2563
2564 /* See comment in cm_establish about lookup. */
2565 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2566 if (!cm_id_priv)
2567 return -EINVAL;
2568
2569 spin_lock_irq(&cm_id_priv->lock);
2570 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2571 spin_unlock_irq(&cm_id_priv->lock);
2572 goto out;
2573 }
2574
2575 ib_cancel_mad(cm_id_priv->msg);
2576 cm_queue_work_unlock(cm_id_priv, work);
2577 return 0;
2578out:
2579 cm_deref_id(cm_id_priv);
2580 return -EINVAL;
2581}
2582
2583static int cm_rtu_handler(struct cm_work *work)
2584{
2585 struct cm_id_private *cm_id_priv;
2586 struct cm_rtu_msg *rtu_msg;
2587
2588 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2589 cm_id_priv = cm_acquire_id(
2590 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)),
2591 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg)));
2592 if (!cm_id_priv)
2593 return -EINVAL;
2594
2595 work->cm_event.private_data =
2596 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg);
2597
2598 spin_lock_irq(&cm_id_priv->lock);
2599 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2600 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2601 spin_unlock_irq(&cm_id_priv->lock);
2602 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2603 [CM_RTU_COUNTER]);
2604 goto out;
2605 }
2606 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2607
2608 ib_cancel_mad(cm_id_priv->msg);
2609 cm_queue_work_unlock(cm_id_priv, work);
2610 return 0;
2611out:
2612 cm_deref_id(cm_id_priv);
2613 return -EINVAL;
2614}
2615
2616static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2617 struct cm_id_private *cm_id_priv,
2618 const void *private_data,
2619 u8 private_data_len)
2620{
2621 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2622 cm_form_tid(cm_id_priv));
2623 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg,
2624 be32_to_cpu(cm_id_priv->id.local_id));
2625 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg,
2626 be32_to_cpu(cm_id_priv->id.remote_id));
2627 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg,
2628 be32_to_cpu(cm_id_priv->remote_qpn));
2629
2630 if (private_data && private_data_len)
2631 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data,
2632 private_data_len);
2633}
2634
2635static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
2636 const void *private_data, u8 private_data_len)
2637{
2638 struct ib_mad_send_buf *msg;
2639 int ret;
2640
2641 lockdep_assert_held(&cm_id_priv->lock);
2642
2643 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2644 return -EINVAL;
2645
2646 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2647 trace_icm_dreq_skipped(&cm_id_priv->id);
2648 return -EINVAL;
2649 }
2650
2651 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2652 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2653 ib_cancel_mad(cm_id_priv->msg);
2654
2655 msg = cm_alloc_priv_msg(cm_id_priv);
2656 if (IS_ERR(msg)) {
2657 cm_enter_timewait(cm_id_priv);
2658 return PTR_ERR(msg);
2659 }
2660
2661 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2662 private_data, private_data_len);
2663 msg->timeout_ms = cm_id_priv->timeout_ms;
2664 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2665
2666 trace_icm_send_dreq(&cm_id_priv->id);
2667 ret = ib_post_send_mad(msg, NULL);
2668 if (ret) {
2669 cm_enter_timewait(cm_id_priv);
2670 cm_free_priv_msg(msg);
2671 return ret;
2672 }
2673
2674 cm_id_priv->id.state = IB_CM_DREQ_SENT;
2675 return 0;
2676}
2677
2678int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data,
2679 u8 private_data_len)
2680{
2681 struct cm_id_private *cm_id_priv =
2682 container_of(cm_id, struct cm_id_private, id);
2683 unsigned long flags;
2684 int ret;
2685
2686 spin_lock_irqsave(&cm_id_priv->lock, flags);
2687 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len);
2688 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2689 return ret;
2690}
2691EXPORT_SYMBOL(ib_send_cm_dreq);
2692
2693static void cm_format_drep(struct cm_drep_msg *drep_msg,
2694 struct cm_id_private *cm_id_priv,
2695 const void *private_data,
2696 u8 private_data_len)
2697{
2698 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2699 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2700 be32_to_cpu(cm_id_priv->id.local_id));
2701 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2702 be32_to_cpu(cm_id_priv->id.remote_id));
2703
2704 if (private_data && private_data_len)
2705 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data,
2706 private_data_len);
2707}
2708
2709static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
2710 void *private_data, u8 private_data_len)
2711{
2712 struct ib_mad_send_buf *msg;
2713 int ret;
2714
2715 lockdep_assert_held(&cm_id_priv->lock);
2716
2717 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2718 return -EINVAL;
2719
2720 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2721 trace_icm_send_drep_err(&cm_id_priv->id);
2722 kfree(private_data);
2723 return -EINVAL;
2724 }
2725
2726 cm_set_private_data(cm_id_priv, private_data, private_data_len);
2727 cm_enter_timewait(cm_id_priv);
2728
2729 msg = cm_alloc_msg(cm_id_priv);
2730 if (IS_ERR(msg))
2731 return PTR_ERR(msg);
2732
2733 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2734 private_data, private_data_len);
2735
2736 trace_icm_send_drep(&cm_id_priv->id);
2737 ret = ib_post_send_mad(msg, NULL);
2738 if (ret) {
2739 cm_free_msg(msg);
2740 return ret;
2741 }
2742 return 0;
2743}
2744
2745int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
2746 u8 private_data_len)
2747{
2748 struct cm_id_private *cm_id_priv =
2749 container_of(cm_id, struct cm_id_private, id);
2750 unsigned long flags;
2751 void *data;
2752 int ret;
2753
2754 data = cm_copy_private_data(private_data, private_data_len);
2755 if (IS_ERR(data))
2756 return PTR_ERR(data);
2757
2758 spin_lock_irqsave(&cm_id_priv->lock, flags);
2759 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len);
2760 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2761 return ret;
2762}
2763EXPORT_SYMBOL(ib_send_cm_drep);
2764
2765static int cm_issue_drep(struct cm_port *port,
2766 struct ib_mad_recv_wc *mad_recv_wc)
2767{
2768 struct ib_mad_send_buf *msg = NULL;
2769 struct cm_dreq_msg *dreq_msg;
2770 struct cm_drep_msg *drep_msg;
2771 int ret;
2772
2773 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2774 if (ret)
2775 return ret;
2776
2777 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2778 drep_msg = (struct cm_drep_msg *) msg->mad;
2779
2780 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2781 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2782 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg));
2783 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2784 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2785
2786 trace_icm_issue_drep(
2787 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2788 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2789 ret = ib_post_send_mad(msg, NULL);
2790 if (ret)
2791 cm_free_response_msg(msg);
2792
2793 return ret;
2794}
2795
2796static int cm_dreq_handler(struct cm_work *work)
2797{
2798 struct cm_id_private *cm_id_priv;
2799 struct cm_dreq_msg *dreq_msg;
2800 struct ib_mad_send_buf *msg = NULL;
2801
2802 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2803 cm_id_priv = cm_acquire_id(
2804 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)),
2805 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)));
2806 if (!cm_id_priv) {
2807 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2808 [CM_DREQ_COUNTER]);
2809 cm_issue_drep(work->port, work->mad_recv_wc);
2810 trace_icm_no_priv_err(
2811 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2812 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2813 return -EINVAL;
2814 }
2815
2816 work->cm_event.private_data =
2817 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg);
2818
2819 spin_lock_irq(&cm_id_priv->lock);
2820 if (cm_id_priv->local_qpn !=
2821 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg)))
2822 goto unlock;
2823
2824 switch (cm_id_priv->id.state) {
2825 case IB_CM_REP_SENT:
2826 case IB_CM_DREQ_SENT:
2827 case IB_CM_MRA_REP_RCVD:
2828 ib_cancel_mad(cm_id_priv->msg);
2829 break;
2830 case IB_CM_ESTABLISHED:
2831 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2832 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2833 ib_cancel_mad(cm_id_priv->msg);
2834 break;
2835 case IB_CM_TIMEWAIT:
2836 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2837 [CM_DREQ_COUNTER]);
2838 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2839 if (IS_ERR(msg))
2840 goto unlock;
2841
2842 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2843 cm_id_priv->private_data,
2844 cm_id_priv->private_data_len);
2845 spin_unlock_irq(&cm_id_priv->lock);
2846
2847 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2848 ib_post_send_mad(msg, NULL))
2849 cm_free_response_msg(msg);
2850 goto deref;
2851 case IB_CM_DREQ_RCVD:
2852 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
2853 [CM_DREQ_COUNTER]);
2854 goto unlock;
2855 default:
2856 trace_icm_dreq_unknown_err(&cm_id_priv->id);
2857 goto unlock;
2858 }
2859 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2860 cm_id_priv->tid = dreq_msg->hdr.tid;
2861 cm_queue_work_unlock(cm_id_priv, work);
2862 return 0;
2863
2864unlock: spin_unlock_irq(&cm_id_priv->lock);
2865deref: cm_deref_id(cm_id_priv);
2866 return -EINVAL;
2867}
2868
2869static int cm_drep_handler(struct cm_work *work)
2870{
2871 struct cm_id_private *cm_id_priv;
2872 struct cm_drep_msg *drep_msg;
2873
2874 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2875 cm_id_priv = cm_acquire_id(
2876 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)),
2877 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg)));
2878 if (!cm_id_priv)
2879 return -EINVAL;
2880
2881 work->cm_event.private_data =
2882 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg);
2883
2884 spin_lock_irq(&cm_id_priv->lock);
2885 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2886 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2887 spin_unlock_irq(&cm_id_priv->lock);
2888 goto out;
2889 }
2890 cm_enter_timewait(cm_id_priv);
2891
2892 ib_cancel_mad(cm_id_priv->msg);
2893 cm_queue_work_unlock(cm_id_priv, work);
2894 return 0;
2895out:
2896 cm_deref_id(cm_id_priv);
2897 return -EINVAL;
2898}
2899
2900static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
2901 enum ib_cm_rej_reason reason, void *ari,
2902 u8 ari_length, const void *private_data,
2903 u8 private_data_len)
2904{
2905 enum ib_cm_state state = cm_id_priv->id.state;
2906 struct ib_mad_send_buf *msg;
2907 int ret;
2908
2909 lockdep_assert_held(&cm_id_priv->lock);
2910
2911 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2912 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2913 return -EINVAL;
2914
2915 trace_icm_send_rej(&cm_id_priv->id, reason);
2916
2917 switch (state) {
2918 case IB_CM_REQ_SENT:
2919 case IB_CM_MRA_REQ_RCVD:
2920 case IB_CM_REQ_RCVD:
2921 case IB_CM_MRA_REQ_SENT:
2922 case IB_CM_REP_RCVD:
2923 case IB_CM_MRA_REP_SENT:
2924 cm_reset_to_idle(cm_id_priv);
2925 msg = cm_alloc_msg(cm_id_priv);
2926 if (IS_ERR(msg))
2927 return PTR_ERR(msg);
2928 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2929 ari, ari_length, private_data, private_data_len,
2930 state);
2931 break;
2932 case IB_CM_REP_SENT:
2933 case IB_CM_MRA_REP_RCVD:
2934 cm_enter_timewait(cm_id_priv);
2935 msg = cm_alloc_msg(cm_id_priv);
2936 if (IS_ERR(msg))
2937 return PTR_ERR(msg);
2938 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2939 ari, ari_length, private_data, private_data_len,
2940 state);
2941 break;
2942 default:
2943 trace_icm_send_unknown_rej_err(&cm_id_priv->id);
2944 return -EINVAL;
2945 }
2946
2947 ret = ib_post_send_mad(msg, NULL);
2948 if (ret) {
2949 cm_free_msg(msg);
2950 return ret;
2951 }
2952
2953 return 0;
2954}
2955
2956int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason,
2957 void *ari, u8 ari_length, const void *private_data,
2958 u8 private_data_len)
2959{
2960 struct cm_id_private *cm_id_priv =
2961 container_of(cm_id, struct cm_id_private, id);
2962 unsigned long flags;
2963 int ret;
2964
2965 spin_lock_irqsave(&cm_id_priv->lock, flags);
2966 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length,
2967 private_data, private_data_len);
2968 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2969 return ret;
2970}
2971EXPORT_SYMBOL(ib_send_cm_rej);
2972
2973static void cm_format_rej_event(struct cm_work *work)
2974{
2975 struct cm_rej_msg *rej_msg;
2976 struct ib_cm_rej_event_param *param;
2977
2978 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2979 param = &work->cm_event.param.rej_rcvd;
2980 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg);
2981 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg);
2982 param->reason = IBA_GET(CM_REJ_REASON, rej_msg);
2983 work->cm_event.private_data =
2984 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg);
2985}
2986
2987static struct cm_id_private *cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2988{
2989 struct cm_id_private *cm_id_priv;
2990 __be32 remote_id;
2991
2992 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg));
2993
2994 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) {
2995 cm_id_priv = cm_find_remote_id(
2996 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)),
2997 remote_id);
2998 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) ==
2999 CM_MSG_RESPONSE_REQ)
3000 cm_id_priv = cm_acquire_id(
3001 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3002 0);
3003 else
3004 cm_id_priv = cm_acquire_id(
3005 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3006 remote_id);
3007
3008 return cm_id_priv;
3009}
3010
3011static int cm_rej_handler(struct cm_work *work)
3012{
3013 struct cm_id_private *cm_id_priv;
3014 struct cm_rej_msg *rej_msg;
3015
3016 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3017 cm_id_priv = cm_acquire_rejected_id(rej_msg);
3018 if (!cm_id_priv)
3019 return -EINVAL;
3020
3021 cm_format_rej_event(work);
3022
3023 spin_lock_irq(&cm_id_priv->lock);
3024 switch (cm_id_priv->id.state) {
3025 case IB_CM_REQ_SENT:
3026 case IB_CM_MRA_REQ_RCVD:
3027 case IB_CM_REP_SENT:
3028 case IB_CM_MRA_REP_RCVD:
3029 ib_cancel_mad(cm_id_priv->msg);
3030 fallthrough;
3031 case IB_CM_REQ_RCVD:
3032 case IB_CM_MRA_REQ_SENT:
3033 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN)
3034 cm_enter_timewait(cm_id_priv);
3035 else
3036 cm_reset_to_idle(cm_id_priv);
3037 break;
3038 case IB_CM_DREQ_SENT:
3039 ib_cancel_mad(cm_id_priv->msg);
3040 fallthrough;
3041 case IB_CM_REP_RCVD:
3042 case IB_CM_MRA_REP_SENT:
3043 cm_enter_timewait(cm_id_priv);
3044 break;
3045 case IB_CM_ESTABLISHED:
3046 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
3047 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
3048 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
3049 ib_cancel_mad(cm_id_priv->msg);
3050 cm_enter_timewait(cm_id_priv);
3051 break;
3052 }
3053 fallthrough;
3054 default:
3055 trace_icm_rej_unknown_err(&cm_id_priv->id);
3056 spin_unlock_irq(&cm_id_priv->lock);
3057 goto out;
3058 }
3059
3060 cm_queue_work_unlock(cm_id_priv, work);
3061 return 0;
3062out:
3063 cm_deref_id(cm_id_priv);
3064 return -EINVAL;
3065}
3066
3067int ib_send_cm_mra(struct ib_cm_id *cm_id,
3068 u8 service_timeout,
3069 const void *private_data,
3070 u8 private_data_len)
3071{
3072 struct cm_id_private *cm_id_priv;
3073 struct ib_mad_send_buf *msg;
3074 enum ib_cm_state cm_state;
3075 enum ib_cm_lap_state lap_state;
3076 enum cm_msg_response msg_response;
3077 void *data;
3078 unsigned long flags;
3079 int ret;
3080
3081 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
3082 return -EINVAL;
3083
3084 data = cm_copy_private_data(private_data, private_data_len);
3085 if (IS_ERR(data))
3086 return PTR_ERR(data);
3087
3088 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3089
3090 spin_lock_irqsave(&cm_id_priv->lock, flags);
3091 switch (cm_id_priv->id.state) {
3092 case IB_CM_REQ_RCVD:
3093 cm_state = IB_CM_MRA_REQ_SENT;
3094 lap_state = cm_id->lap_state;
3095 msg_response = CM_MSG_RESPONSE_REQ;
3096 break;
3097 case IB_CM_REP_RCVD:
3098 cm_state = IB_CM_MRA_REP_SENT;
3099 lap_state = cm_id->lap_state;
3100 msg_response = CM_MSG_RESPONSE_REP;
3101 break;
3102 case IB_CM_ESTABLISHED:
3103 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
3104 cm_state = cm_id->state;
3105 lap_state = IB_CM_MRA_LAP_SENT;
3106 msg_response = CM_MSG_RESPONSE_OTHER;
3107 break;
3108 }
3109 fallthrough;
3110 default:
3111 trace_icm_send_mra_unknown_err(&cm_id_priv->id);
3112 ret = -EINVAL;
3113 goto error_unlock;
3114 }
3115
3116 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
3117 msg = cm_alloc_msg(cm_id_priv);
3118 if (IS_ERR(msg)) {
3119 ret = PTR_ERR(msg);
3120 goto error_unlock;
3121 }
3122
3123 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3124 msg_response, service_timeout,
3125 private_data, private_data_len);
3126 trace_icm_send_mra(cm_id);
3127 ret = ib_post_send_mad(msg, NULL);
3128 if (ret)
3129 goto error_free_msg;
3130 }
3131
3132 cm_id->state = cm_state;
3133 cm_id->lap_state = lap_state;
3134 cm_id_priv->service_timeout = service_timeout;
3135 cm_set_private_data(cm_id_priv, data, private_data_len);
3136 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3137 return 0;
3138
3139error_free_msg:
3140 cm_free_msg(msg);
3141error_unlock:
3142 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3143 kfree(data);
3144 return ret;
3145}
3146EXPORT_SYMBOL(ib_send_cm_mra);
3147
3148static struct cm_id_private *cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
3149{
3150 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) {
3151 case CM_MSG_RESPONSE_REQ:
3152 return cm_acquire_id(
3153 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3154 0);
3155 case CM_MSG_RESPONSE_REP:
3156 case CM_MSG_RESPONSE_OTHER:
3157 return cm_acquire_id(
3158 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3159 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg)));
3160 default:
3161 return NULL;
3162 }
3163}
3164
3165static int cm_mra_handler(struct cm_work *work)
3166{
3167 struct cm_id_private *cm_id_priv;
3168 struct cm_mra_msg *mra_msg;
3169 int timeout;
3170
3171 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3172 cm_id_priv = cm_acquire_mraed_id(mra_msg);
3173 if (!cm_id_priv)
3174 return -EINVAL;
3175
3176 work->cm_event.private_data =
3177 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg);
3178 work->cm_event.param.mra_rcvd.service_timeout =
3179 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg);
3180 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) +
3181 cm_convert_to_ms(cm_id_priv->av.timeout);
3182
3183 spin_lock_irq(&cm_id_priv->lock);
3184 switch (cm_id_priv->id.state) {
3185 case IB_CM_REQ_SENT:
3186 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3187 CM_MSG_RESPONSE_REQ ||
3188 ib_modify_mad(cm_id_priv->msg, timeout))
3189 goto out;
3190 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3191 break;
3192 case IB_CM_REP_SENT:
3193 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3194 CM_MSG_RESPONSE_REP ||
3195 ib_modify_mad(cm_id_priv->msg, timeout))
3196 goto out;
3197 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3198 break;
3199 case IB_CM_ESTABLISHED:
3200 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3201 CM_MSG_RESPONSE_OTHER ||
3202 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3203 ib_modify_mad(cm_id_priv->msg, timeout)) {
3204 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3205 atomic_long_inc(
3206 &work->port->counters[CM_RECV_DUPLICATES]
3207 [CM_MRA_COUNTER]);
3208 goto out;
3209 }
3210 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3211 break;
3212 case IB_CM_MRA_REQ_RCVD:
3213 case IB_CM_MRA_REP_RCVD:
3214 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3215 [CM_MRA_COUNTER]);
3216 fallthrough;
3217 default:
3218 trace_icm_mra_unknown_err(&cm_id_priv->id);
3219 goto out;
3220 }
3221
3222 cm_id_priv->msg->context[1] = (void *) (unsigned long)
3223 cm_id_priv->id.state;
3224 cm_queue_work_unlock(cm_id_priv, work);
3225 return 0;
3226out:
3227 spin_unlock_irq(&cm_id_priv->lock);
3228 cm_deref_id(cm_id_priv);
3229 return -EINVAL;
3230}
3231
3232static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3233 struct sa_path_rec *path)
3234{
3235 u32 lid;
3236
3237 if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3238 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID,
3239 lap_msg));
3240 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID,
3241 lap_msg));
3242 } else {
3243 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3244 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg));
3245 sa_path_set_dlid(path, lid);
3246
3247 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3248 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg));
3249 sa_path_set_slid(path, lid);
3250 }
3251}
3252
3253static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3254 struct sa_path_rec *path,
3255 struct cm_lap_msg *lap_msg)
3256{
3257 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg);
3258 path->sgid =
3259 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg);
3260 path->flow_label =
3261 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg));
3262 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg);
3263 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg);
3264 path->reversible = 1;
3265 path->pkey = cm_id_priv->pkey;
3266 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg);
3267 path->mtu_selector = IB_SA_EQ;
3268 path->mtu = cm_id_priv->path_mtu;
3269 path->rate_selector = IB_SA_EQ;
3270 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg);
3271 path->packet_life_time_selector = IB_SA_EQ;
3272 path->packet_life_time =
3273 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg);
3274 path->packet_life_time -= (path->packet_life_time > 0);
3275 cm_format_path_lid_from_lap(lap_msg, path);
3276}
3277
3278static int cm_lap_handler(struct cm_work *work)
3279{
3280 struct cm_id_private *cm_id_priv;
3281 struct cm_lap_msg *lap_msg;
3282 struct ib_cm_lap_event_param *param;
3283 struct ib_mad_send_buf *msg = NULL;
3284 struct rdma_ah_attr ah_attr;
3285 struct cm_av alt_av = {};
3286 int ret;
3287
3288 /* Currently Alternate path messages are not supported for
3289 * RoCE link layer.
3290 */
3291 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3292 work->port->port_num))
3293 return -EINVAL;
3294
3295 /* todo: verify LAP request and send reject APR if invalid. */
3296 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3297 cm_id_priv = cm_acquire_id(
3298 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)),
3299 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg)));
3300 if (!cm_id_priv)
3301 return -EINVAL;
3302
3303 param = &work->cm_event.param.lap_rcvd;
3304 memset(&work->path[0], 0, sizeof(work->path[1]));
3305 cm_path_set_rec_type(work->port->cm_dev->ib_device,
3306 work->port->port_num, &work->path[0],
3307 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID,
3308 lap_msg));
3309 param->alternate_path = &work->path[0];
3310 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3311 work->cm_event.private_data =
3312 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg);
3313
3314 ret = ib_init_ah_attr_from_wc(work->port->cm_dev->ib_device,
3315 work->port->port_num,
3316 work->mad_recv_wc->wc,
3317 work->mad_recv_wc->recv_buf.grh,
3318 &ah_attr);
3319 if (ret)
3320 goto deref;
3321
3322 ret = cm_init_av_by_path(param->alternate_path, NULL, &alt_av);
3323 if (ret) {
3324 rdma_destroy_ah_attr(&ah_attr);
3325 goto deref;
3326 }
3327
3328 spin_lock_irq(&cm_id_priv->lock);
3329 cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3330 &ah_attr, &cm_id_priv->av);
3331 cm_move_av_from_path(&cm_id_priv->alt_av, &alt_av);
3332
3333 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3334 goto unlock;
3335
3336 switch (cm_id_priv->id.lap_state) {
3337 case IB_CM_LAP_UNINIT:
3338 case IB_CM_LAP_IDLE:
3339 break;
3340 case IB_CM_MRA_LAP_SENT:
3341 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3342 [CM_LAP_COUNTER]);
3343 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3344 if (IS_ERR(msg))
3345 goto unlock;
3346
3347 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3348 CM_MSG_RESPONSE_OTHER,
3349 cm_id_priv->service_timeout,
3350 cm_id_priv->private_data,
3351 cm_id_priv->private_data_len);
3352 spin_unlock_irq(&cm_id_priv->lock);
3353
3354 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3355 ib_post_send_mad(msg, NULL))
3356 cm_free_response_msg(msg);
3357 goto deref;
3358 case IB_CM_LAP_RCVD:
3359 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3360 [CM_LAP_COUNTER]);
3361 goto unlock;
3362 default:
3363 goto unlock;
3364 }
3365
3366 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3367 cm_id_priv->tid = lap_msg->hdr.tid;
3368 cm_queue_work_unlock(cm_id_priv, work);
3369 return 0;
3370
3371unlock: spin_unlock_irq(&cm_id_priv->lock);
3372deref: cm_deref_id(cm_id_priv);
3373 return -EINVAL;
3374}
3375
3376static int cm_apr_handler(struct cm_work *work)
3377{
3378 struct cm_id_private *cm_id_priv;
3379 struct cm_apr_msg *apr_msg;
3380
3381 /* Currently Alternate path messages are not supported for
3382 * RoCE link layer.
3383 */
3384 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3385 work->port->port_num))
3386 return -EINVAL;
3387
3388 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3389 cm_id_priv = cm_acquire_id(
3390 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)),
3391 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg)));
3392 if (!cm_id_priv)
3393 return -EINVAL; /* Unmatched reply. */
3394
3395 work->cm_event.param.apr_rcvd.ap_status =
3396 IBA_GET(CM_APR_AR_STATUS, apr_msg);
3397 work->cm_event.param.apr_rcvd.apr_info =
3398 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg);
3399 work->cm_event.param.apr_rcvd.info_len =
3400 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg);
3401 work->cm_event.private_data =
3402 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg);
3403
3404 spin_lock_irq(&cm_id_priv->lock);
3405 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3406 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3407 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3408 spin_unlock_irq(&cm_id_priv->lock);
3409 goto out;
3410 }
3411 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3412 ib_cancel_mad(cm_id_priv->msg);
3413 cm_queue_work_unlock(cm_id_priv, work);
3414 return 0;
3415out:
3416 cm_deref_id(cm_id_priv);
3417 return -EINVAL;
3418}
3419
3420static int cm_timewait_handler(struct cm_work *work)
3421{
3422 struct cm_timewait_info *timewait_info;
3423 struct cm_id_private *cm_id_priv;
3424
3425 timewait_info = container_of(work, struct cm_timewait_info, work);
3426 spin_lock_irq(&cm.lock);
3427 list_del(&timewait_info->list);
3428 spin_unlock_irq(&cm.lock);
3429
3430 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3431 timewait_info->work.remote_id);
3432 if (!cm_id_priv)
3433 return -EINVAL;
3434
3435 spin_lock_irq(&cm_id_priv->lock);
3436 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3437 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3438 spin_unlock_irq(&cm_id_priv->lock);
3439 goto out;
3440 }
3441 cm_id_priv->id.state = IB_CM_IDLE;
3442 cm_queue_work_unlock(cm_id_priv, work);
3443 return 0;
3444out:
3445 cm_deref_id(cm_id_priv);
3446 return -EINVAL;
3447}
3448
3449static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3450 struct cm_id_private *cm_id_priv,
3451 struct ib_cm_sidr_req_param *param)
3452{
3453 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3454 cm_form_tid(cm_id_priv));
3455 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg,
3456 be32_to_cpu(cm_id_priv->id.local_id));
3457 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg,
3458 be16_to_cpu(param->path->pkey));
3459 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg,
3460 be64_to_cpu(param->service_id));
3461
3462 if (param->private_data && param->private_data_len)
3463 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg,
3464 param->private_data, param->private_data_len);
3465}
3466
3467int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3468 struct ib_cm_sidr_req_param *param)
3469{
3470 struct cm_id_private *cm_id_priv;
3471 struct ib_mad_send_buf *msg;
3472 struct cm_av av = {};
3473 unsigned long flags;
3474 int ret;
3475
3476 if (!param->path || (param->private_data &&
3477 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3478 return -EINVAL;
3479
3480 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3481 ret = cm_init_av_by_path(param->path, param->sgid_attr, &av);
3482 if (ret)
3483 return ret;
3484
3485 spin_lock_irqsave(&cm_id_priv->lock, flags);
3486 cm_move_av_from_path(&cm_id_priv->av, &av);
3487 cm_id->service_id = param->service_id;
3488 cm_id_priv->timeout_ms = param->timeout_ms;
3489 cm_id_priv->max_cm_retries = param->max_cm_retries;
3490 if (cm_id->state != IB_CM_IDLE) {
3491 ret = -EINVAL;
3492 goto out_unlock;
3493 }
3494
3495 msg = cm_alloc_priv_msg(cm_id_priv);
3496 if (IS_ERR(msg)) {
3497 ret = PTR_ERR(msg);
3498 goto out_unlock;
3499 }
3500
3501 cm_format_sidr_req((struct cm_sidr_req_msg *)msg->mad, cm_id_priv,
3502 param);
3503 msg->timeout_ms = cm_id_priv->timeout_ms;
3504 msg->context[1] = (void *)(unsigned long)IB_CM_SIDR_REQ_SENT;
3505
3506 trace_icm_send_sidr_req(&cm_id_priv->id);
3507 ret = ib_post_send_mad(msg, NULL);
3508 if (ret)
3509 goto out_free;
3510 cm_id->state = IB_CM_SIDR_REQ_SENT;
3511 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3512 return 0;
3513out_free:
3514 cm_free_priv_msg(msg);
3515out_unlock:
3516 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3517 return ret;
3518}
3519EXPORT_SYMBOL(ib_send_cm_sidr_req);
3520
3521static void cm_format_sidr_req_event(struct cm_work *work,
3522 const struct cm_id_private *rx_cm_id,
3523 struct ib_cm_id *listen_id)
3524{
3525 struct cm_sidr_req_msg *sidr_req_msg;
3526 struct ib_cm_sidr_req_event_param *param;
3527
3528 sidr_req_msg = (struct cm_sidr_req_msg *)
3529 work->mad_recv_wc->recv_buf.mad;
3530 param = &work->cm_event.param.sidr_req_rcvd;
3531 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg);
3532 param->listen_id = listen_id;
3533 param->service_id =
3534 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3535 param->bth_pkey = cm_get_bth_pkey(work);
3536 param->port = work->port->port_num;
3537 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3538 work->cm_event.private_data =
3539 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg);
3540}
3541
3542static int cm_sidr_req_handler(struct cm_work *work)
3543{
3544 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
3545 struct cm_sidr_req_msg *sidr_req_msg;
3546 struct ib_wc *wc;
3547 int ret;
3548
3549 cm_id_priv =
3550 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
3551 if (IS_ERR(cm_id_priv))
3552 return PTR_ERR(cm_id_priv);
3553
3554 /* Record SGID/SLID and request ID for lookup. */
3555 sidr_req_msg = (struct cm_sidr_req_msg *)
3556 work->mad_recv_wc->recv_buf.mad;
3557
3558 cm_id_priv->id.remote_id =
3559 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg));
3560 cm_id_priv->id.service_id =
3561 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3562 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3563
3564 wc = work->mad_recv_wc->wc;
3565 cm_id_priv->sidr_slid = wc->slid;
3566 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3567 work->mad_recv_wc->recv_buf.grh,
3568 &cm_id_priv->av);
3569 if (ret)
3570 goto out;
3571
3572 spin_lock_irq(&cm.lock);
3573 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3574 if (listen_cm_id_priv) {
3575 spin_unlock_irq(&cm.lock);
3576 atomic_long_inc(&work->port->counters[CM_RECV_DUPLICATES]
3577 [CM_SIDR_REQ_COUNTER]);
3578 goto out; /* Duplicate message. */
3579 }
3580 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3581 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
3582 cm_id_priv->id.service_id);
3583 if (!listen_cm_id_priv) {
3584 spin_unlock_irq(&cm.lock);
3585 ib_send_cm_sidr_rep(&cm_id_priv->id,
3586 &(struct ib_cm_sidr_rep_param){
3587 .status = IB_SIDR_UNSUPPORTED });
3588 goto out; /* No match. */
3589 }
3590 spin_unlock_irq(&cm.lock);
3591
3592 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
3593 cm_id_priv->id.context = listen_cm_id_priv->id.context;
3594
3595 /*
3596 * A SIDR ID does not need to be in the xarray since it does not receive
3597 * mads, is not placed in the remote_id or remote_qpn rbtree, and does
3598 * not enter timewait.
3599 */
3600
3601 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
3602 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
3603 cm_free_work(work);
3604 /*
3605 * A pointer to the listen_cm_id is held in the event, so this deref
3606 * must be after the event is delivered above.
3607 */
3608 cm_deref_id(listen_cm_id_priv);
3609 if (ret)
3610 cm_destroy_id(&cm_id_priv->id, ret);
3611 return 0;
3612out:
3613 ib_destroy_cm_id(&cm_id_priv->id);
3614 return -EINVAL;
3615}
3616
3617static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3618 struct cm_id_private *cm_id_priv,
3619 struct ib_cm_sidr_rep_param *param)
3620{
3621 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3622 cm_id_priv->tid, param->ece.attr_mod);
3623 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg,
3624 be32_to_cpu(cm_id_priv->id.remote_id));
3625 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status);
3626 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num);
3627 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg,
3628 be64_to_cpu(cm_id_priv->id.service_id));
3629 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey);
3630 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg,
3631 param->ece.vendor_id & 0xFF);
3632 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg,
3633 (param->ece.vendor_id >> 8) & 0xFF);
3634
3635 if (param->info && param->info_length)
3636 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg,
3637 param->info, param->info_length);
3638
3639 if (param->private_data && param->private_data_len)
3640 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg,
3641 param->private_data, param->private_data_len);
3642}
3643
3644static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
3645 struct ib_cm_sidr_rep_param *param)
3646{
3647 struct ib_mad_send_buf *msg;
3648 unsigned long flags;
3649 int ret;
3650
3651 lockdep_assert_held(&cm_id_priv->lock);
3652
3653 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3654 (param->private_data &&
3655 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3656 return -EINVAL;
3657
3658 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD)
3659 return -EINVAL;
3660
3661 msg = cm_alloc_msg(cm_id_priv);
3662 if (IS_ERR(msg))
3663 return PTR_ERR(msg);
3664
3665 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3666 param);
3667 trace_icm_send_sidr_rep(&cm_id_priv->id);
3668 ret = ib_post_send_mad(msg, NULL);
3669 if (ret) {
3670 cm_free_msg(msg);
3671 return ret;
3672 }
3673 cm_id_priv->id.state = IB_CM_IDLE;
3674 spin_lock_irqsave(&cm.lock, flags);
3675 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3676 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3677 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3678 }
3679 spin_unlock_irqrestore(&cm.lock, flags);
3680 return 0;
3681}
3682
3683int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3684 struct ib_cm_sidr_rep_param *param)
3685{
3686 struct cm_id_private *cm_id_priv =
3687 container_of(cm_id, struct cm_id_private, id);
3688 unsigned long flags;
3689 int ret;
3690
3691 spin_lock_irqsave(&cm_id_priv->lock, flags);
3692 ret = cm_send_sidr_rep_locked(cm_id_priv, param);
3693 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3694 return ret;
3695}
3696EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3697
3698static void cm_format_sidr_rep_event(struct cm_work *work,
3699 const struct cm_id_private *cm_id_priv)
3700{
3701 struct cm_sidr_rep_msg *sidr_rep_msg;
3702 struct ib_cm_sidr_rep_event_param *param;
3703
3704 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3705 work->mad_recv_wc->recv_buf.mad;
3706 param = &work->cm_event.param.sidr_rep_rcvd;
3707 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg);
3708 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg);
3709 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg);
3710 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION,
3711 sidr_rep_msg);
3712 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH,
3713 sidr_rep_msg);
3714 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3715 work->cm_event.private_data =
3716 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg);
3717}
3718
3719static int cm_sidr_rep_handler(struct cm_work *work)
3720{
3721 struct cm_sidr_rep_msg *sidr_rep_msg;
3722 struct cm_id_private *cm_id_priv;
3723
3724 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3725 work->mad_recv_wc->recv_buf.mad;
3726 cm_id_priv = cm_acquire_id(
3727 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0);
3728 if (!cm_id_priv)
3729 return -EINVAL; /* Unmatched reply. */
3730
3731 spin_lock_irq(&cm_id_priv->lock);
3732 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3733 spin_unlock_irq(&cm_id_priv->lock);
3734 goto out;
3735 }
3736 cm_id_priv->id.state = IB_CM_IDLE;
3737 ib_cancel_mad(cm_id_priv->msg);
3738 spin_unlock_irq(&cm_id_priv->lock);
3739
3740 cm_format_sidr_rep_event(work, cm_id_priv);
3741 cm_process_work(cm_id_priv, work);
3742 return 0;
3743out:
3744 cm_deref_id(cm_id_priv);
3745 return -EINVAL;
3746}
3747
3748static void cm_process_send_error(struct cm_id_private *cm_id_priv,
3749 struct ib_mad_send_buf *msg,
3750 enum ib_cm_state state,
3751 enum ib_wc_status wc_status)
3752{
3753 struct ib_cm_event cm_event = {};
3754 int ret;
3755
3756 /* Discard old sends or ones without a response. */
3757 spin_lock_irq(&cm_id_priv->lock);
3758 if (msg != cm_id_priv->msg) {
3759 spin_unlock_irq(&cm_id_priv->lock);
3760 cm_free_msg(msg);
3761 return;
3762 }
3763 cm_free_priv_msg(msg);
3764
3765 if (state != cm_id_priv->id.state || wc_status == IB_WC_SUCCESS ||
3766 wc_status == IB_WC_WR_FLUSH_ERR)
3767 goto out_unlock;
3768
3769 trace_icm_mad_send_err(state, wc_status);
3770 switch (state) {
3771 case IB_CM_REQ_SENT:
3772 case IB_CM_MRA_REQ_RCVD:
3773 cm_reset_to_idle(cm_id_priv);
3774 cm_event.event = IB_CM_REQ_ERROR;
3775 break;
3776 case IB_CM_REP_SENT:
3777 case IB_CM_MRA_REP_RCVD:
3778 cm_reset_to_idle(cm_id_priv);
3779 cm_event.event = IB_CM_REP_ERROR;
3780 break;
3781 case IB_CM_DREQ_SENT:
3782 cm_enter_timewait(cm_id_priv);
3783 cm_event.event = IB_CM_DREQ_ERROR;
3784 break;
3785 case IB_CM_SIDR_REQ_SENT:
3786 cm_id_priv->id.state = IB_CM_IDLE;
3787 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3788 break;
3789 default:
3790 goto out_unlock;
3791 }
3792 spin_unlock_irq(&cm_id_priv->lock);
3793 cm_event.param.send_status = wc_status;
3794
3795 /* No other events can occur on the cm_id at this point. */
3796 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3797 if (ret)
3798 ib_destroy_cm_id(&cm_id_priv->id);
3799 return;
3800out_unlock:
3801 spin_unlock_irq(&cm_id_priv->lock);
3802}
3803
3804static void cm_send_handler(struct ib_mad_agent *mad_agent,
3805 struct ib_mad_send_wc *mad_send_wc)
3806{
3807 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3808 struct cm_id_private *cm_id_priv = msg->context[0];
3809 enum ib_cm_state state =
3810 (enum ib_cm_state)(unsigned long)msg->context[1];
3811 struct cm_port *port;
3812 u16 attr_index;
3813
3814 port = mad_agent->context;
3815 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3816 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3817
3818 /*
3819 * If the send was in response to a received message (context[0] is not
3820 * set to a cm_id), and is not a REJ, then it is a send that was
3821 * manually retried.
3822 */
3823 if (!cm_id_priv && (attr_index != CM_REJ_COUNTER))
3824 msg->retries = 1;
3825
3826 atomic_long_add(1 + msg->retries, &port->counters[CM_XMIT][attr_index]);
3827 if (msg->retries)
3828 atomic_long_add(msg->retries,
3829 &port->counters[CM_XMIT_RETRIES][attr_index]);
3830
3831 if (cm_id_priv)
3832 cm_process_send_error(cm_id_priv, msg, state,
3833 mad_send_wc->status);
3834 else
3835 cm_free_response_msg(msg);
3836}
3837
3838static void cm_work_handler(struct work_struct *_work)
3839{
3840 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3841 int ret;
3842
3843 switch (work->cm_event.event) {
3844 case IB_CM_REQ_RECEIVED:
3845 ret = cm_req_handler(work);
3846 break;
3847 case IB_CM_MRA_RECEIVED:
3848 ret = cm_mra_handler(work);
3849 break;
3850 case IB_CM_REJ_RECEIVED:
3851 ret = cm_rej_handler(work);
3852 break;
3853 case IB_CM_REP_RECEIVED:
3854 ret = cm_rep_handler(work);
3855 break;
3856 case IB_CM_RTU_RECEIVED:
3857 ret = cm_rtu_handler(work);
3858 break;
3859 case IB_CM_USER_ESTABLISHED:
3860 ret = cm_establish_handler(work);
3861 break;
3862 case IB_CM_DREQ_RECEIVED:
3863 ret = cm_dreq_handler(work);
3864 break;
3865 case IB_CM_DREP_RECEIVED:
3866 ret = cm_drep_handler(work);
3867 break;
3868 case IB_CM_SIDR_REQ_RECEIVED:
3869 ret = cm_sidr_req_handler(work);
3870 break;
3871 case IB_CM_SIDR_REP_RECEIVED:
3872 ret = cm_sidr_rep_handler(work);
3873 break;
3874 case IB_CM_LAP_RECEIVED:
3875 ret = cm_lap_handler(work);
3876 break;
3877 case IB_CM_APR_RECEIVED:
3878 ret = cm_apr_handler(work);
3879 break;
3880 case IB_CM_TIMEWAIT_EXIT:
3881 ret = cm_timewait_handler(work);
3882 break;
3883 default:
3884 trace_icm_handler_err(work->cm_event.event);
3885 ret = -EINVAL;
3886 break;
3887 }
3888 if (ret)
3889 cm_free_work(work);
3890}
3891
3892static int cm_establish(struct ib_cm_id *cm_id)
3893{
3894 struct cm_id_private *cm_id_priv;
3895 struct cm_work *work;
3896 unsigned long flags;
3897 int ret = 0;
3898 struct cm_device *cm_dev;
3899
3900 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3901 if (!cm_dev)
3902 return -ENODEV;
3903
3904 work = kmalloc(sizeof *work, GFP_ATOMIC);
3905 if (!work)
3906 return -ENOMEM;
3907
3908 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3909 spin_lock_irqsave(&cm_id_priv->lock, flags);
3910 switch (cm_id->state) {
3911 case IB_CM_REP_SENT:
3912 case IB_CM_MRA_REP_RCVD:
3913 cm_id->state = IB_CM_ESTABLISHED;
3914 break;
3915 case IB_CM_ESTABLISHED:
3916 ret = -EISCONN;
3917 break;
3918 default:
3919 trace_icm_establish_err(cm_id);
3920 ret = -EINVAL;
3921 break;
3922 }
3923 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3924
3925 if (ret) {
3926 kfree(work);
3927 goto out;
3928 }
3929
3930 /*
3931 * The CM worker thread may try to destroy the cm_id before it
3932 * can execute this work item. To prevent potential deadlock,
3933 * we need to find the cm_id once we're in the context of the
3934 * worker thread, rather than holding a reference on it.
3935 */
3936 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3937 work->local_id = cm_id->local_id;
3938 work->remote_id = cm_id->remote_id;
3939 work->mad_recv_wc = NULL;
3940 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3941
3942 /* Check if the device started its remove_one */
3943 spin_lock_irqsave(&cm.lock, flags);
3944 if (!cm_dev->going_down) {
3945 queue_delayed_work(cm.wq, &work->work, 0);
3946 } else {
3947 kfree(work);
3948 ret = -ENODEV;
3949 }
3950 spin_unlock_irqrestore(&cm.lock, flags);
3951
3952out:
3953 return ret;
3954}
3955
3956static int cm_migrate(struct ib_cm_id *cm_id)
3957{
3958 struct cm_id_private *cm_id_priv;
3959 unsigned long flags;
3960 int ret = 0;
3961
3962 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3963 spin_lock_irqsave(&cm_id_priv->lock, flags);
3964 if (cm_id->state == IB_CM_ESTABLISHED &&
3965 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3966 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3967 cm_id->lap_state = IB_CM_LAP_IDLE;
3968 cm_id_priv->av = cm_id_priv->alt_av;
3969 } else
3970 ret = -EINVAL;
3971 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3972
3973 return ret;
3974}
3975
3976int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3977{
3978 int ret;
3979
3980 switch (event) {
3981 case IB_EVENT_COMM_EST:
3982 ret = cm_establish(cm_id);
3983 break;
3984 case IB_EVENT_PATH_MIG:
3985 ret = cm_migrate(cm_id);
3986 break;
3987 default:
3988 ret = -EINVAL;
3989 }
3990 return ret;
3991}
3992EXPORT_SYMBOL(ib_cm_notify);
3993
3994static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3995 struct ib_mad_send_buf *send_buf,
3996 struct ib_mad_recv_wc *mad_recv_wc)
3997{
3998 struct cm_port *port = mad_agent->context;
3999 struct cm_work *work;
4000 enum ib_cm_event_type event;
4001 bool alt_path = false;
4002 u16 attr_id;
4003 int paths = 0;
4004 int going_down = 0;
4005
4006 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4007 case CM_REQ_ATTR_ID:
4008 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4009 mad_recv_wc->recv_buf.mad);
4010 paths = 1 + (alt_path != 0);
4011 event = IB_CM_REQ_RECEIVED;
4012 break;
4013 case CM_MRA_ATTR_ID:
4014 event = IB_CM_MRA_RECEIVED;
4015 break;
4016 case CM_REJ_ATTR_ID:
4017 event = IB_CM_REJ_RECEIVED;
4018 break;
4019 case CM_REP_ATTR_ID:
4020 event = IB_CM_REP_RECEIVED;
4021 break;
4022 case CM_RTU_ATTR_ID:
4023 event = IB_CM_RTU_RECEIVED;
4024 break;
4025 case CM_DREQ_ATTR_ID:
4026 event = IB_CM_DREQ_RECEIVED;
4027 break;
4028 case CM_DREP_ATTR_ID:
4029 event = IB_CM_DREP_RECEIVED;
4030 break;
4031 case CM_SIDR_REQ_ATTR_ID:
4032 event = IB_CM_SIDR_REQ_RECEIVED;
4033 break;
4034 case CM_SIDR_REP_ATTR_ID:
4035 event = IB_CM_SIDR_REP_RECEIVED;
4036 break;
4037 case CM_LAP_ATTR_ID:
4038 paths = 1;
4039 event = IB_CM_LAP_RECEIVED;
4040 break;
4041 case CM_APR_ATTR_ID:
4042 event = IB_CM_APR_RECEIVED;
4043 break;
4044 default:
4045 ib_free_recv_mad(mad_recv_wc);
4046 return;
4047 }
4048
4049 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4050 atomic_long_inc(&port->counters[CM_RECV][attr_id - CM_ATTR_ID_OFFSET]);
4051
4052 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4053 if (!work) {
4054 ib_free_recv_mad(mad_recv_wc);
4055 return;
4056 }
4057
4058 INIT_DELAYED_WORK(&work->work, cm_work_handler);
4059 work->cm_event.event = event;
4060 work->mad_recv_wc = mad_recv_wc;
4061 work->port = port;
4062
4063 /* Check if the device started its remove_one */
4064 spin_lock_irq(&cm.lock);
4065 if (!port->cm_dev->going_down)
4066 queue_delayed_work(cm.wq, &work->work, 0);
4067 else
4068 going_down = 1;
4069 spin_unlock_irq(&cm.lock);
4070
4071 if (going_down) {
4072 kfree(work);
4073 ib_free_recv_mad(mad_recv_wc);
4074 }
4075}
4076
4077static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4078 struct ib_qp_attr *qp_attr,
4079 int *qp_attr_mask)
4080{
4081 unsigned long flags;
4082 int ret;
4083
4084 spin_lock_irqsave(&cm_id_priv->lock, flags);
4085 switch (cm_id_priv->id.state) {
4086 case IB_CM_REQ_SENT:
4087 case IB_CM_MRA_REQ_RCVD:
4088 case IB_CM_REQ_RCVD:
4089 case IB_CM_MRA_REQ_SENT:
4090 case IB_CM_REP_RCVD:
4091 case IB_CM_MRA_REP_SENT:
4092 case IB_CM_REP_SENT:
4093 case IB_CM_MRA_REP_RCVD:
4094 case IB_CM_ESTABLISHED:
4095 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4096 IB_QP_PKEY_INDEX | IB_QP_PORT;
4097 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4098 if (cm_id_priv->responder_resources) {
4099 struct ib_device *ib_dev = cm_id_priv->id.device;
4100 u64 support_flush = ib_dev->attrs.device_cap_flags &
4101 (IB_DEVICE_FLUSH_GLOBAL | IB_DEVICE_FLUSH_PERSISTENT);
4102 u32 flushable = support_flush ?
4103 (IB_ACCESS_FLUSH_GLOBAL |
4104 IB_ACCESS_FLUSH_PERSISTENT) : 0;
4105
4106 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4107 IB_ACCESS_REMOTE_ATOMIC |
4108 flushable;
4109 }
4110 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4111 if (cm_id_priv->av.port)
4112 qp_attr->port_num = cm_id_priv->av.port->port_num;
4113 ret = 0;
4114 break;
4115 default:
4116 trace_icm_qp_init_err(&cm_id_priv->id);
4117 ret = -EINVAL;
4118 break;
4119 }
4120 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4121 return ret;
4122}
4123
4124static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4125 struct ib_qp_attr *qp_attr,
4126 int *qp_attr_mask)
4127{
4128 unsigned long flags;
4129 int ret;
4130
4131 spin_lock_irqsave(&cm_id_priv->lock, flags);
4132 switch (cm_id_priv->id.state) {
4133 case IB_CM_REQ_RCVD:
4134 case IB_CM_MRA_REQ_SENT:
4135 case IB_CM_REP_RCVD:
4136 case IB_CM_MRA_REP_SENT:
4137 case IB_CM_REP_SENT:
4138 case IB_CM_MRA_REP_RCVD:
4139 case IB_CM_ESTABLISHED:
4140 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4141 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4142 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4143 if ((qp_attr->ah_attr.type == RDMA_AH_ATTR_TYPE_IB) &&
4144 cm_id_priv->av.dlid_datapath &&
4145 (cm_id_priv->av.dlid_datapath != 0xffff))
4146 qp_attr->ah_attr.ib.dlid = cm_id_priv->av.dlid_datapath;
4147 qp_attr->path_mtu = cm_id_priv->path_mtu;
4148 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4149 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4150 if (cm_id_priv->qp_type == IB_QPT_RC ||
4151 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4152 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4153 IB_QP_MIN_RNR_TIMER;
4154 qp_attr->max_dest_rd_atomic =
4155 cm_id_priv->responder_resources;
4156 qp_attr->min_rnr_timer = 0;
4157 }
4158 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr) &&
4159 cm_id_priv->alt_av.port) {
4160 *qp_attr_mask |= IB_QP_ALT_PATH;
4161 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4162 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4163 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4164 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4165 }
4166 ret = 0;
4167 break;
4168 default:
4169 trace_icm_qp_rtr_err(&cm_id_priv->id);
4170 ret = -EINVAL;
4171 break;
4172 }
4173 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4174 return ret;
4175}
4176
4177static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4178 struct ib_qp_attr *qp_attr,
4179 int *qp_attr_mask)
4180{
4181 unsigned long flags;
4182 int ret;
4183
4184 spin_lock_irqsave(&cm_id_priv->lock, flags);
4185 switch (cm_id_priv->id.state) {
4186 /* Allow transition to RTS before sending REP */
4187 case IB_CM_REQ_RCVD:
4188 case IB_CM_MRA_REQ_SENT:
4189
4190 case IB_CM_REP_RCVD:
4191 case IB_CM_MRA_REP_SENT:
4192 case IB_CM_REP_SENT:
4193 case IB_CM_MRA_REP_RCVD:
4194 case IB_CM_ESTABLISHED:
4195 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4196 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4197 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4198 switch (cm_id_priv->qp_type) {
4199 case IB_QPT_RC:
4200 case IB_QPT_XRC_INI:
4201 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4202 IB_QP_MAX_QP_RD_ATOMIC;
4203 qp_attr->retry_cnt = cm_id_priv->retry_count;
4204 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4205 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4206 fallthrough;
4207 case IB_QPT_XRC_TGT:
4208 *qp_attr_mask |= IB_QP_TIMEOUT;
4209 qp_attr->timeout = cm_id_priv->av.timeout;
4210 break;
4211 default:
4212 break;
4213 }
4214 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4215 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4216 qp_attr->path_mig_state = IB_MIG_REARM;
4217 }
4218 } else {
4219 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4220 if (cm_id_priv->alt_av.port)
4221 qp_attr->alt_port_num =
4222 cm_id_priv->alt_av.port->port_num;
4223 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4224 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4225 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4226 qp_attr->path_mig_state = IB_MIG_REARM;
4227 }
4228 ret = 0;
4229 break;
4230 default:
4231 trace_icm_qp_rts_err(&cm_id_priv->id);
4232 ret = -EINVAL;
4233 break;
4234 }
4235 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4236 return ret;
4237}
4238
4239int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4240 struct ib_qp_attr *qp_attr,
4241 int *qp_attr_mask)
4242{
4243 struct cm_id_private *cm_id_priv;
4244 int ret;
4245
4246 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4247 switch (qp_attr->qp_state) {
4248 case IB_QPS_INIT:
4249 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4250 break;
4251 case IB_QPS_RTR:
4252 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4253 break;
4254 case IB_QPS_RTS:
4255 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4256 break;
4257 default:
4258 ret = -EINVAL;
4259 break;
4260 }
4261 return ret;
4262}
4263EXPORT_SYMBOL(ib_cm_init_qp_attr);
4264
4265static ssize_t cm_show_counter(struct ib_device *ibdev, u32 port_num,
4266 struct ib_port_attribute *attr, char *buf)
4267{
4268 struct cm_counter_attribute *cm_attr =
4269 container_of(attr, struct cm_counter_attribute, attr);
4270 struct cm_device *cm_dev = ib_get_client_data(ibdev, &cm_client);
4271
4272 if (WARN_ON(!cm_dev))
4273 return -EINVAL;
4274
4275 return sysfs_emit(
4276 buf, "%ld\n",
4277 atomic_long_read(
4278 &cm_dev->port[port_num - 1]
4279 ->counters[cm_attr->group][cm_attr->index]));
4280}
4281
4282#define CM_COUNTER_ATTR(_name, _group, _index) \
4283 { \
4284 .attr = __ATTR(_name, 0444, cm_show_counter, NULL), \
4285 .group = _group, .index = _index \
4286 }
4287
4288#define CM_COUNTER_GROUP(_group, _name) \
4289 static struct cm_counter_attribute cm_counter_attr_##_group[] = { \
4290 CM_COUNTER_ATTR(req, _group, CM_REQ_COUNTER), \
4291 CM_COUNTER_ATTR(mra, _group, CM_MRA_COUNTER), \
4292 CM_COUNTER_ATTR(rej, _group, CM_REJ_COUNTER), \
4293 CM_COUNTER_ATTR(rep, _group, CM_REP_COUNTER), \
4294 CM_COUNTER_ATTR(rtu, _group, CM_RTU_COUNTER), \
4295 CM_COUNTER_ATTR(dreq, _group, CM_DREQ_COUNTER), \
4296 CM_COUNTER_ATTR(drep, _group, CM_DREP_COUNTER), \
4297 CM_COUNTER_ATTR(sidr_req, _group, CM_SIDR_REQ_COUNTER), \
4298 CM_COUNTER_ATTR(sidr_rep, _group, CM_SIDR_REP_COUNTER), \
4299 CM_COUNTER_ATTR(lap, _group, CM_LAP_COUNTER), \
4300 CM_COUNTER_ATTR(apr, _group, CM_APR_COUNTER), \
4301 }; \
4302 static struct attribute *cm_counter_attrs_##_group[] = { \
4303 &cm_counter_attr_##_group[0].attr.attr, \
4304 &cm_counter_attr_##_group[1].attr.attr, \
4305 &cm_counter_attr_##_group[2].attr.attr, \
4306 &cm_counter_attr_##_group[3].attr.attr, \
4307 &cm_counter_attr_##_group[4].attr.attr, \
4308 &cm_counter_attr_##_group[5].attr.attr, \
4309 &cm_counter_attr_##_group[6].attr.attr, \
4310 &cm_counter_attr_##_group[7].attr.attr, \
4311 &cm_counter_attr_##_group[8].attr.attr, \
4312 &cm_counter_attr_##_group[9].attr.attr, \
4313 &cm_counter_attr_##_group[10].attr.attr, \
4314 NULL, \
4315 }; \
4316 static const struct attribute_group cm_counter_group_##_group = { \
4317 .name = _name, \
4318 .attrs = cm_counter_attrs_##_group, \
4319 };
4320
4321CM_COUNTER_GROUP(CM_XMIT, "cm_tx_msgs")
4322CM_COUNTER_GROUP(CM_XMIT_RETRIES, "cm_tx_retries")
4323CM_COUNTER_GROUP(CM_RECV, "cm_rx_msgs")
4324CM_COUNTER_GROUP(CM_RECV_DUPLICATES, "cm_rx_duplicates")
4325
4326static const struct attribute_group *cm_counter_groups[] = {
4327 &cm_counter_group_CM_XMIT,
4328 &cm_counter_group_CM_XMIT_RETRIES,
4329 &cm_counter_group_CM_RECV,
4330 &cm_counter_group_CM_RECV_DUPLICATES,
4331 NULL,
4332};
4333
4334static int cm_add_one(struct ib_device *ib_device)
4335{
4336 struct cm_device *cm_dev;
4337 struct cm_port *port;
4338 struct ib_mad_reg_req reg_req = {
4339 .mgmt_class = IB_MGMT_CLASS_CM,
4340 .mgmt_class_version = IB_CM_CLASS_VERSION,
4341 };
4342 struct ib_port_modify port_modify = {
4343 .set_port_cap_mask = IB_PORT_CM_SUP
4344 };
4345 unsigned long flags;
4346 int ret;
4347 int count = 0;
4348 u32 i;
4349
4350 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4351 GFP_KERNEL);
4352 if (!cm_dev)
4353 return -ENOMEM;
4354
4355 kref_init(&cm_dev->kref);
4356 spin_lock_init(&cm_dev->mad_agent_lock);
4357 cm_dev->ib_device = ib_device;
4358 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4359 cm_dev->going_down = 0;
4360
4361 ib_set_client_data(ib_device, &cm_client, cm_dev);
4362
4363 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4364 rdma_for_each_port (ib_device, i) {
4365 if (!rdma_cap_ib_cm(ib_device, i))
4366 continue;
4367
4368 port = kzalloc(sizeof *port, GFP_KERNEL);
4369 if (!port) {
4370 ret = -ENOMEM;
4371 goto error1;
4372 }
4373
4374 cm_dev->port[i-1] = port;
4375 port->cm_dev = cm_dev;
4376 port->port_num = i;
4377
4378 ret = ib_port_register_client_groups(ib_device, i,
4379 cm_counter_groups);
4380 if (ret)
4381 goto error1;
4382
4383 port->mad_agent = ib_register_mad_agent(ib_device, i,
4384 IB_QPT_GSI,
4385 ®_req,
4386 0,
4387 cm_send_handler,
4388 cm_recv_handler,
4389 port,
4390 0);
4391 if (IS_ERR(port->mad_agent)) {
4392 ret = PTR_ERR(port->mad_agent);
4393 goto error2;
4394 }
4395
4396 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4397 if (ret)
4398 goto error3;
4399
4400 count++;
4401 }
4402
4403 if (!count) {
4404 ret = -EOPNOTSUPP;
4405 goto free;
4406 }
4407
4408 write_lock_irqsave(&cm.device_lock, flags);
4409 list_add_tail(&cm_dev->list, &cm.device_list);
4410 write_unlock_irqrestore(&cm.device_lock, flags);
4411 return 0;
4412
4413error3:
4414 ib_unregister_mad_agent(port->mad_agent);
4415error2:
4416 ib_port_unregister_client_groups(ib_device, i, cm_counter_groups);
4417error1:
4418 port_modify.set_port_cap_mask = 0;
4419 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4420 while (--i) {
4421 if (!rdma_cap_ib_cm(ib_device, i))
4422 continue;
4423
4424 port = cm_dev->port[i-1];
4425 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4426 ib_unregister_mad_agent(port->mad_agent);
4427 ib_port_unregister_client_groups(ib_device, i,
4428 cm_counter_groups);
4429 }
4430free:
4431 cm_device_put(cm_dev);
4432 return ret;
4433}
4434
4435static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4436{
4437 struct cm_device *cm_dev = client_data;
4438 struct cm_port *port;
4439 struct ib_port_modify port_modify = {
4440 .clr_port_cap_mask = IB_PORT_CM_SUP
4441 };
4442 unsigned long flags;
4443 u32 i;
4444
4445 write_lock_irqsave(&cm.device_lock, flags);
4446 list_del(&cm_dev->list);
4447 write_unlock_irqrestore(&cm.device_lock, flags);
4448
4449 spin_lock_irq(&cm.lock);
4450 cm_dev->going_down = 1;
4451 spin_unlock_irq(&cm.lock);
4452
4453 rdma_for_each_port (ib_device, i) {
4454 struct ib_mad_agent *mad_agent;
4455
4456 if (!rdma_cap_ib_cm(ib_device, i))
4457 continue;
4458
4459 port = cm_dev->port[i-1];
4460 mad_agent = port->mad_agent;
4461 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4462 /*
4463 * We flush the queue here after the going_down set, this
4464 * verify that no new works will be queued in the recv handler,
4465 * after that we can call the unregister_mad_agent
4466 */
4467 flush_workqueue(cm.wq);
4468 /*
4469 * The above ensures no call paths from the work are running,
4470 * the remaining paths all take the mad_agent_lock.
4471 */
4472 spin_lock(&cm_dev->mad_agent_lock);
4473 port->mad_agent = NULL;
4474 spin_unlock(&cm_dev->mad_agent_lock);
4475 ib_unregister_mad_agent(mad_agent);
4476 ib_port_unregister_client_groups(ib_device, i,
4477 cm_counter_groups);
4478 }
4479
4480 cm_device_put(cm_dev);
4481}
4482
4483static int __init ib_cm_init(void)
4484{
4485 int ret;
4486
4487 INIT_LIST_HEAD(&cm.device_list);
4488 rwlock_init(&cm.device_lock);
4489 spin_lock_init(&cm.lock);
4490 cm.listen_service_table = RB_ROOT;
4491 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4492 cm.remote_id_table = RB_ROOT;
4493 cm.remote_qp_table = RB_ROOT;
4494 cm.remote_sidr_table = RB_ROOT;
4495 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC);
4496 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4497 INIT_LIST_HEAD(&cm.timewait_list);
4498
4499 cm.wq = alloc_workqueue("ib_cm", 0, 1);
4500 if (!cm.wq) {
4501 ret = -ENOMEM;
4502 goto error2;
4503 }
4504
4505 ret = ib_register_client(&cm_client);
4506 if (ret)
4507 goto error3;
4508
4509 return 0;
4510error3:
4511 destroy_workqueue(cm.wq);
4512error2:
4513 return ret;
4514}
4515
4516static void __exit ib_cm_cleanup(void)
4517{
4518 struct cm_timewait_info *timewait_info, *tmp;
4519
4520 spin_lock_irq(&cm.lock);
4521 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4522 cancel_delayed_work(&timewait_info->work.work);
4523 spin_unlock_irq(&cm.lock);
4524
4525 ib_unregister_client(&cm_client);
4526 destroy_workqueue(cm.wq);
4527
4528 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4529 list_del(&timewait_info->list);
4530 kfree(timewait_info);
4531 }
4532
4533 WARN_ON(!xa_empty(&cm.local_id_table));
4534}
4535
4536module_init(ib_cm_init);
4537module_exit(ib_cm_cleanup);
1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2/*
3 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
4 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
5 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
6 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
7 * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
8 */
9
10#include <linux/completion.h>
11#include <linux/dma-mapping.h>
12#include <linux/device.h>
13#include <linux/module.h>
14#include <linux/err.h>
15#include <linux/idr.h>
16#include <linux/interrupt.h>
17#include <linux/random.h>
18#include <linux/rbtree.h>
19#include <linux/spinlock.h>
20#include <linux/slab.h>
21#include <linux/sysfs.h>
22#include <linux/workqueue.h>
23#include <linux/kdev_t.h>
24#include <linux/etherdevice.h>
25
26#include <rdma/ib_cache.h>
27#include <rdma/ib_cm.h>
28#include "cm_msgs.h"
29#include "core_priv.h"
30
31MODULE_AUTHOR("Sean Hefty");
32MODULE_DESCRIPTION("InfiniBand CM");
33MODULE_LICENSE("Dual BSD/GPL");
34
35static const char * const ibcm_rej_reason_strs[] = {
36 [IB_CM_REJ_NO_QP] = "no QP",
37 [IB_CM_REJ_NO_EEC] = "no EEC",
38 [IB_CM_REJ_NO_RESOURCES] = "no resources",
39 [IB_CM_REJ_TIMEOUT] = "timeout",
40 [IB_CM_REJ_UNSUPPORTED] = "unsupported",
41 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
42 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
43 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
44 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
45 [IB_CM_REJ_STALE_CONN] = "stale conn",
46 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
47 [IB_CM_REJ_INVALID_GID] = "invalid GID",
48 [IB_CM_REJ_INVALID_LID] = "invalid LID",
49 [IB_CM_REJ_INVALID_SL] = "invalid SL",
50 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
51 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
52 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
53 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
54 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
55 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
56 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
57 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
58 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
59 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
60 [IB_CM_REJ_PORT_REDIRECT] = "port redirect",
61 [IB_CM_REJ_INVALID_MTU] = "invalid MTU",
62 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
63 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
64 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
65 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
66 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
67 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
68 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
69 [IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED] =
70 "vendor option is not supported",
71};
72
73const char *__attribute_const__ ibcm_reject_msg(int reason)
74{
75 size_t index = reason;
76
77 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
78 ibcm_rej_reason_strs[index])
79 return ibcm_rej_reason_strs[index];
80 else
81 return "unrecognized reason";
82}
83EXPORT_SYMBOL(ibcm_reject_msg);
84
85struct cm_id_private;
86struct cm_work;
87static int cm_add_one(struct ib_device *device);
88static void cm_remove_one(struct ib_device *device, void *client_data);
89static void cm_process_work(struct cm_id_private *cm_id_priv,
90 struct cm_work *work);
91static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
92 struct ib_cm_sidr_rep_param *param);
93static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
94 const void *private_data, u8 private_data_len);
95static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
96 void *private_data, u8 private_data_len);
97static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
98 enum ib_cm_rej_reason reason, void *ari,
99 u8 ari_length, const void *private_data,
100 u8 private_data_len);
101
102static struct ib_client cm_client = {
103 .name = "cm",
104 .add = cm_add_one,
105 .remove = cm_remove_one
106};
107
108static struct ib_cm {
109 spinlock_t lock;
110 struct list_head device_list;
111 rwlock_t device_lock;
112 struct rb_root listen_service_table;
113 u64 listen_service_id;
114 /* struct rb_root peer_service_table; todo: fix peer to peer */
115 struct rb_root remote_qp_table;
116 struct rb_root remote_id_table;
117 struct rb_root remote_sidr_table;
118 struct xarray local_id_table;
119 u32 local_id_next;
120 __be32 random_id_operand;
121 struct list_head timewait_list;
122 struct workqueue_struct *wq;
123 /* Sync on cm change port state */
124 spinlock_t state_lock;
125} cm;
126
127/* Counter indexes ordered by attribute ID */
128enum {
129 CM_REQ_COUNTER,
130 CM_MRA_COUNTER,
131 CM_REJ_COUNTER,
132 CM_REP_COUNTER,
133 CM_RTU_COUNTER,
134 CM_DREQ_COUNTER,
135 CM_DREP_COUNTER,
136 CM_SIDR_REQ_COUNTER,
137 CM_SIDR_REP_COUNTER,
138 CM_LAP_COUNTER,
139 CM_APR_COUNTER,
140 CM_ATTR_COUNT,
141 CM_ATTR_ID_OFFSET = 0x0010,
142};
143
144enum {
145 CM_XMIT,
146 CM_XMIT_RETRIES,
147 CM_RECV,
148 CM_RECV_DUPLICATES,
149 CM_COUNTER_GROUPS
150};
151
152static char const counter_group_names[CM_COUNTER_GROUPS]
153 [sizeof("cm_rx_duplicates")] = {
154 "cm_tx_msgs", "cm_tx_retries",
155 "cm_rx_msgs", "cm_rx_duplicates"
156};
157
158struct cm_counter_group {
159 struct kobject obj;
160 atomic_long_t counter[CM_ATTR_COUNT];
161};
162
163struct cm_counter_attribute {
164 struct attribute attr;
165 int index;
166};
167
168#define CM_COUNTER_ATTR(_name, _index) \
169struct cm_counter_attribute cm_##_name##_counter_attr = { \
170 .attr = { .name = __stringify(_name), .mode = 0444 }, \
171 .index = _index \
172}
173
174static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
175static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
176static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
177static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
178static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
179static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
180static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
181static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
182static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
183static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
184static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
185
186static struct attribute *cm_counter_default_attrs[] = {
187 &cm_req_counter_attr.attr,
188 &cm_mra_counter_attr.attr,
189 &cm_rej_counter_attr.attr,
190 &cm_rep_counter_attr.attr,
191 &cm_rtu_counter_attr.attr,
192 &cm_dreq_counter_attr.attr,
193 &cm_drep_counter_attr.attr,
194 &cm_sidr_req_counter_attr.attr,
195 &cm_sidr_rep_counter_attr.attr,
196 &cm_lap_counter_attr.attr,
197 &cm_apr_counter_attr.attr,
198 NULL
199};
200
201struct cm_port {
202 struct cm_device *cm_dev;
203 struct ib_mad_agent *mad_agent;
204 struct kobject port_obj;
205 u8 port_num;
206 struct list_head cm_priv_prim_list;
207 struct list_head cm_priv_altr_list;
208 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
209};
210
211struct cm_device {
212 struct list_head list;
213 struct ib_device *ib_device;
214 u8 ack_delay;
215 int going_down;
216 struct cm_port *port[];
217};
218
219struct cm_av {
220 struct cm_port *port;
221 union ib_gid dgid;
222 struct rdma_ah_attr ah_attr;
223 u16 pkey_index;
224 u8 timeout;
225};
226
227struct cm_work {
228 struct delayed_work work;
229 struct list_head list;
230 struct cm_port *port;
231 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
232 __be32 local_id; /* Established / timewait */
233 __be32 remote_id;
234 struct ib_cm_event cm_event;
235 struct sa_path_rec path[];
236};
237
238struct cm_timewait_info {
239 struct cm_work work;
240 struct list_head list;
241 struct rb_node remote_qp_node;
242 struct rb_node remote_id_node;
243 __be64 remote_ca_guid;
244 __be32 remote_qpn;
245 u8 inserted_remote_qp;
246 u8 inserted_remote_id;
247};
248
249struct cm_id_private {
250 struct ib_cm_id id;
251
252 struct rb_node service_node;
253 struct rb_node sidr_id_node;
254 spinlock_t lock; /* Do not acquire inside cm.lock */
255 struct completion comp;
256 refcount_t refcount;
257 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
258 * Protected by the cm.lock spinlock. */
259 int listen_sharecount;
260 struct rcu_head rcu;
261
262 struct ib_mad_send_buf *msg;
263 struct cm_timewait_info *timewait_info;
264 /* todo: use alternate port on send failure */
265 struct cm_av av;
266 struct cm_av alt_av;
267
268 void *private_data;
269 __be64 tid;
270 __be32 local_qpn;
271 __be32 remote_qpn;
272 enum ib_qp_type qp_type;
273 __be32 sq_psn;
274 __be32 rq_psn;
275 int timeout_ms;
276 enum ib_mtu path_mtu;
277 __be16 pkey;
278 u8 private_data_len;
279 u8 max_cm_retries;
280 u8 responder_resources;
281 u8 initiator_depth;
282 u8 retry_count;
283 u8 rnr_retry_count;
284 u8 service_timeout;
285 u8 target_ack_delay;
286
287 struct list_head prim_list;
288 struct list_head altr_list;
289 /* Indicates that the send port mad is registered and av is set */
290 int prim_send_port_not_ready;
291 int altr_send_port_not_ready;
292
293 struct list_head work_list;
294 atomic_t work_count;
295
296 struct rdma_ucm_ece ece;
297};
298
299static void cm_work_handler(struct work_struct *work);
300
301static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
302{
303 if (refcount_dec_and_test(&cm_id_priv->refcount))
304 complete(&cm_id_priv->comp);
305}
306
307static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
308 struct ib_mad_send_buf **msg)
309{
310 struct ib_mad_agent *mad_agent;
311 struct ib_mad_send_buf *m;
312 struct ib_ah *ah;
313 struct cm_av *av;
314 unsigned long flags, flags2;
315 int ret = 0;
316
317 /* don't let the port to be released till the agent is down */
318 spin_lock_irqsave(&cm.state_lock, flags2);
319 spin_lock_irqsave(&cm.lock, flags);
320 if (!cm_id_priv->prim_send_port_not_ready)
321 av = &cm_id_priv->av;
322 else if (!cm_id_priv->altr_send_port_not_ready &&
323 (cm_id_priv->alt_av.port))
324 av = &cm_id_priv->alt_av;
325 else {
326 pr_info("%s: not valid CM id\n", __func__);
327 ret = -ENODEV;
328 spin_unlock_irqrestore(&cm.lock, flags);
329 goto out;
330 }
331 spin_unlock_irqrestore(&cm.lock, flags);
332 /* Make sure the port haven't released the mad yet */
333 mad_agent = cm_id_priv->av.port->mad_agent;
334 if (!mad_agent) {
335 pr_info("%s: not a valid MAD agent\n", __func__);
336 ret = -ENODEV;
337 goto out;
338 }
339 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr, 0);
340 if (IS_ERR(ah)) {
341 ret = PTR_ERR(ah);
342 goto out;
343 }
344
345 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
346 av->pkey_index,
347 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
348 GFP_ATOMIC,
349 IB_MGMT_BASE_VERSION);
350 if (IS_ERR(m)) {
351 rdma_destroy_ah(ah, 0);
352 ret = PTR_ERR(m);
353 goto out;
354 }
355
356 /* Timeout set by caller if response is expected. */
357 m->ah = ah;
358 m->retries = cm_id_priv->max_cm_retries;
359
360 refcount_inc(&cm_id_priv->refcount);
361 m->context[0] = cm_id_priv;
362 *msg = m;
363
364out:
365 spin_unlock_irqrestore(&cm.state_lock, flags2);
366 return ret;
367}
368
369static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
370 struct ib_mad_recv_wc *mad_recv_wc)
371{
372 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
373 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
374 GFP_ATOMIC,
375 IB_MGMT_BASE_VERSION);
376}
377
378static int cm_create_response_msg_ah(struct cm_port *port,
379 struct ib_mad_recv_wc *mad_recv_wc,
380 struct ib_mad_send_buf *msg)
381{
382 struct ib_ah *ah;
383
384 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
385 mad_recv_wc->recv_buf.grh, port->port_num);
386 if (IS_ERR(ah))
387 return PTR_ERR(ah);
388
389 msg->ah = ah;
390 return 0;
391}
392
393static void cm_free_msg(struct ib_mad_send_buf *msg)
394{
395 if (msg->ah)
396 rdma_destroy_ah(msg->ah, 0);
397 if (msg->context[0])
398 cm_deref_id(msg->context[0]);
399 ib_free_send_mad(msg);
400}
401
402static int cm_alloc_response_msg(struct cm_port *port,
403 struct ib_mad_recv_wc *mad_recv_wc,
404 struct ib_mad_send_buf **msg)
405{
406 struct ib_mad_send_buf *m;
407 int ret;
408
409 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
410 if (IS_ERR(m))
411 return PTR_ERR(m);
412
413 ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
414 if (ret) {
415 cm_free_msg(m);
416 return ret;
417 }
418
419 *msg = m;
420 return 0;
421}
422
423static void * cm_copy_private_data(const void *private_data,
424 u8 private_data_len)
425{
426 void *data;
427
428 if (!private_data || !private_data_len)
429 return NULL;
430
431 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
432 if (!data)
433 return ERR_PTR(-ENOMEM);
434
435 return data;
436}
437
438static void cm_set_private_data(struct cm_id_private *cm_id_priv,
439 void *private_data, u8 private_data_len)
440{
441 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
442 kfree(cm_id_priv->private_data);
443
444 cm_id_priv->private_data = private_data;
445 cm_id_priv->private_data_len = private_data_len;
446}
447
448static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
449 struct ib_grh *grh, struct cm_av *av)
450{
451 struct rdma_ah_attr new_ah_attr;
452 int ret;
453
454 av->port = port;
455 av->pkey_index = wc->pkey_index;
456
457 /*
458 * av->ah_attr might be initialized based on past wc during incoming
459 * connect request or while sending out connect request. So initialize
460 * a new ah_attr on stack. If initialization fails, old ah_attr is
461 * used for sending any responses. If initialization is successful,
462 * than new ah_attr is used by overwriting old one.
463 */
464 ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
465 port->port_num, wc,
466 grh, &new_ah_attr);
467 if (ret)
468 return ret;
469
470 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
471 return 0;
472}
473
474static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
475 struct ib_grh *grh, struct cm_av *av)
476{
477 av->port = port;
478 av->pkey_index = wc->pkey_index;
479 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
480 port->port_num, wc,
481 grh, &av->ah_attr);
482}
483
484static void add_cm_id_to_port_list(struct cm_id_private *cm_id_priv,
485 struct cm_av *av, struct cm_port *port)
486{
487 unsigned long flags;
488
489 spin_lock_irqsave(&cm.lock, flags);
490 if (&cm_id_priv->av == av)
491 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list);
492 else if (&cm_id_priv->alt_av == av)
493 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list);
494 else
495 WARN_ON(true);
496 spin_unlock_irqrestore(&cm.lock, flags);
497}
498
499static struct cm_port *
500get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
501{
502 struct cm_device *cm_dev;
503 struct cm_port *port = NULL;
504 unsigned long flags;
505
506 if (attr) {
507 read_lock_irqsave(&cm.device_lock, flags);
508 list_for_each_entry(cm_dev, &cm.device_list, list) {
509 if (cm_dev->ib_device == attr->device) {
510 port = cm_dev->port[attr->port_num - 1];
511 break;
512 }
513 }
514 read_unlock_irqrestore(&cm.device_lock, flags);
515 } else {
516 /* SGID attribute can be NULL in following
517 * conditions.
518 * (a) Alternative path
519 * (b) IB link layer without GRH
520 * (c) LAP send messages
521 */
522 read_lock_irqsave(&cm.device_lock, flags);
523 list_for_each_entry(cm_dev, &cm.device_list, list) {
524 attr = rdma_find_gid(cm_dev->ib_device,
525 &path->sgid,
526 sa_conv_pathrec_to_gid_type(path),
527 NULL);
528 if (!IS_ERR(attr)) {
529 port = cm_dev->port[attr->port_num - 1];
530 break;
531 }
532 }
533 read_unlock_irqrestore(&cm.device_lock, flags);
534 if (port)
535 rdma_put_gid_attr(attr);
536 }
537 return port;
538}
539
540static int cm_init_av_by_path(struct sa_path_rec *path,
541 const struct ib_gid_attr *sgid_attr,
542 struct cm_av *av,
543 struct cm_id_private *cm_id_priv)
544{
545 struct rdma_ah_attr new_ah_attr;
546 struct cm_device *cm_dev;
547 struct cm_port *port;
548 int ret;
549
550 port = get_cm_port_from_path(path, sgid_attr);
551 if (!port)
552 return -EINVAL;
553 cm_dev = port->cm_dev;
554
555 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
556 be16_to_cpu(path->pkey), &av->pkey_index);
557 if (ret)
558 return ret;
559
560 av->port = port;
561
562 /*
563 * av->ah_attr might be initialized based on wc or during
564 * request processing time which might have reference to sgid_attr.
565 * So initialize a new ah_attr on stack.
566 * If initialization fails, old ah_attr is used for sending any
567 * responses. If initialization is successful, than new ah_attr
568 * is used by overwriting the old one. So that right ah_attr
569 * can be used to return an error response.
570 */
571 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
572 &new_ah_attr, sgid_attr);
573 if (ret)
574 return ret;
575
576 av->timeout = path->packet_life_time + 1;
577 add_cm_id_to_port_list(cm_id_priv, av, port);
578 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
579 return 0;
580}
581
582static u32 cm_local_id(__be32 local_id)
583{
584 return (__force u32) (local_id ^ cm.random_id_operand);
585}
586
587static struct cm_id_private *cm_acquire_id(__be32 local_id, __be32 remote_id)
588{
589 struct cm_id_private *cm_id_priv;
590
591 rcu_read_lock();
592 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id));
593 if (!cm_id_priv || cm_id_priv->id.remote_id != remote_id ||
594 !refcount_inc_not_zero(&cm_id_priv->refcount))
595 cm_id_priv = NULL;
596 rcu_read_unlock();
597
598 return cm_id_priv;
599}
600
601/*
602 * Trivial helpers to strip endian annotation and compare; the
603 * endianness doesn't actually matter since we just need a stable
604 * order for the RB tree.
605 */
606static int be32_lt(__be32 a, __be32 b)
607{
608 return (__force u32) a < (__force u32) b;
609}
610
611static int be32_gt(__be32 a, __be32 b)
612{
613 return (__force u32) a > (__force u32) b;
614}
615
616static int be64_lt(__be64 a, __be64 b)
617{
618 return (__force u64) a < (__force u64) b;
619}
620
621static int be64_gt(__be64 a, __be64 b)
622{
623 return (__force u64) a > (__force u64) b;
624}
625
626/*
627 * Inserts a new cm_id_priv into the listen_service_table. Returns cm_id_priv
628 * if the new ID was inserted, NULL if it could not be inserted due to a
629 * collision, or the existing cm_id_priv ready for shared usage.
630 */
631static struct cm_id_private *cm_insert_listen(struct cm_id_private *cm_id_priv,
632 ib_cm_handler shared_handler)
633{
634 struct rb_node **link = &cm.listen_service_table.rb_node;
635 struct rb_node *parent = NULL;
636 struct cm_id_private *cur_cm_id_priv;
637 __be64 service_id = cm_id_priv->id.service_id;
638 __be64 service_mask = cm_id_priv->id.service_mask;
639 unsigned long flags;
640
641 spin_lock_irqsave(&cm.lock, flags);
642 while (*link) {
643 parent = *link;
644 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
645 service_node);
646 if ((cur_cm_id_priv->id.service_mask & service_id) ==
647 (service_mask & cur_cm_id_priv->id.service_id) &&
648 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) {
649 /*
650 * Sharing an ib_cm_id with different handlers is not
651 * supported
652 */
653 if (cur_cm_id_priv->id.cm_handler != shared_handler ||
654 cur_cm_id_priv->id.context ||
655 WARN_ON(!cur_cm_id_priv->id.cm_handler)) {
656 spin_unlock_irqrestore(&cm.lock, flags);
657 return NULL;
658 }
659 refcount_inc(&cur_cm_id_priv->refcount);
660 cur_cm_id_priv->listen_sharecount++;
661 spin_unlock_irqrestore(&cm.lock, flags);
662 return cur_cm_id_priv;
663 }
664
665 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
666 link = &(*link)->rb_left;
667 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
668 link = &(*link)->rb_right;
669 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
670 link = &(*link)->rb_left;
671 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
672 link = &(*link)->rb_right;
673 else
674 link = &(*link)->rb_right;
675 }
676 cm_id_priv->listen_sharecount++;
677 rb_link_node(&cm_id_priv->service_node, parent, link);
678 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
679 spin_unlock_irqrestore(&cm.lock, flags);
680 return cm_id_priv;
681}
682
683static struct cm_id_private * cm_find_listen(struct ib_device *device,
684 __be64 service_id)
685{
686 struct rb_node *node = cm.listen_service_table.rb_node;
687 struct cm_id_private *cm_id_priv;
688
689 while (node) {
690 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
691 if ((cm_id_priv->id.service_mask & service_id) ==
692 cm_id_priv->id.service_id &&
693 (cm_id_priv->id.device == device)) {
694 refcount_inc(&cm_id_priv->refcount);
695 return cm_id_priv;
696 }
697 if (device < cm_id_priv->id.device)
698 node = node->rb_left;
699 else if (device > cm_id_priv->id.device)
700 node = node->rb_right;
701 else if (be64_lt(service_id, cm_id_priv->id.service_id))
702 node = node->rb_left;
703 else if (be64_gt(service_id, cm_id_priv->id.service_id))
704 node = node->rb_right;
705 else
706 node = node->rb_right;
707 }
708 return NULL;
709}
710
711static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
712 *timewait_info)
713{
714 struct rb_node **link = &cm.remote_id_table.rb_node;
715 struct rb_node *parent = NULL;
716 struct cm_timewait_info *cur_timewait_info;
717 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
718 __be32 remote_id = timewait_info->work.remote_id;
719
720 while (*link) {
721 parent = *link;
722 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
723 remote_id_node);
724 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
725 link = &(*link)->rb_left;
726 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
727 link = &(*link)->rb_right;
728 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
729 link = &(*link)->rb_left;
730 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
731 link = &(*link)->rb_right;
732 else
733 return cur_timewait_info;
734 }
735 timewait_info->inserted_remote_id = 1;
736 rb_link_node(&timewait_info->remote_id_node, parent, link);
737 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
738 return NULL;
739}
740
741static struct cm_id_private *cm_find_remote_id(__be64 remote_ca_guid,
742 __be32 remote_id)
743{
744 struct rb_node *node = cm.remote_id_table.rb_node;
745 struct cm_timewait_info *timewait_info;
746 struct cm_id_private *res = NULL;
747
748 spin_lock_irq(&cm.lock);
749 while (node) {
750 timewait_info = rb_entry(node, struct cm_timewait_info,
751 remote_id_node);
752 if (be32_lt(remote_id, timewait_info->work.remote_id))
753 node = node->rb_left;
754 else if (be32_gt(remote_id, timewait_info->work.remote_id))
755 node = node->rb_right;
756 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
757 node = node->rb_left;
758 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
759 node = node->rb_right;
760 else {
761 res = cm_acquire_id(timewait_info->work.local_id,
762 timewait_info->work.remote_id);
763 break;
764 }
765 }
766 spin_unlock_irq(&cm.lock);
767 return res;
768}
769
770static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
771 *timewait_info)
772{
773 struct rb_node **link = &cm.remote_qp_table.rb_node;
774 struct rb_node *parent = NULL;
775 struct cm_timewait_info *cur_timewait_info;
776 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
777 __be32 remote_qpn = timewait_info->remote_qpn;
778
779 while (*link) {
780 parent = *link;
781 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
782 remote_qp_node);
783 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
784 link = &(*link)->rb_left;
785 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
786 link = &(*link)->rb_right;
787 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
788 link = &(*link)->rb_left;
789 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
790 link = &(*link)->rb_right;
791 else
792 return cur_timewait_info;
793 }
794 timewait_info->inserted_remote_qp = 1;
795 rb_link_node(&timewait_info->remote_qp_node, parent, link);
796 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
797 return NULL;
798}
799
800static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
801 *cm_id_priv)
802{
803 struct rb_node **link = &cm.remote_sidr_table.rb_node;
804 struct rb_node *parent = NULL;
805 struct cm_id_private *cur_cm_id_priv;
806 union ib_gid *port_gid = &cm_id_priv->av.dgid;
807 __be32 remote_id = cm_id_priv->id.remote_id;
808
809 while (*link) {
810 parent = *link;
811 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
812 sidr_id_node);
813 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
814 link = &(*link)->rb_left;
815 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
816 link = &(*link)->rb_right;
817 else {
818 int cmp;
819 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
820 sizeof *port_gid);
821 if (cmp < 0)
822 link = &(*link)->rb_left;
823 else if (cmp > 0)
824 link = &(*link)->rb_right;
825 else
826 return cur_cm_id_priv;
827 }
828 }
829 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
830 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
831 return NULL;
832}
833
834static struct cm_id_private *cm_alloc_id_priv(struct ib_device *device,
835 ib_cm_handler cm_handler,
836 void *context)
837{
838 struct cm_id_private *cm_id_priv;
839 u32 id;
840 int ret;
841
842 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
843 if (!cm_id_priv)
844 return ERR_PTR(-ENOMEM);
845
846 cm_id_priv->id.state = IB_CM_IDLE;
847 cm_id_priv->id.device = device;
848 cm_id_priv->id.cm_handler = cm_handler;
849 cm_id_priv->id.context = context;
850 cm_id_priv->id.remote_cm_qpn = 1;
851
852 RB_CLEAR_NODE(&cm_id_priv->service_node);
853 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
854 spin_lock_init(&cm_id_priv->lock);
855 init_completion(&cm_id_priv->comp);
856 INIT_LIST_HEAD(&cm_id_priv->work_list);
857 INIT_LIST_HEAD(&cm_id_priv->prim_list);
858 INIT_LIST_HEAD(&cm_id_priv->altr_list);
859 atomic_set(&cm_id_priv->work_count, -1);
860 refcount_set(&cm_id_priv->refcount, 1);
861
862 ret = xa_alloc_cyclic_irq(&cm.local_id_table, &id, NULL, xa_limit_32b,
863 &cm.local_id_next, GFP_KERNEL);
864 if (ret < 0)
865 goto error;
866 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
867
868 return cm_id_priv;
869
870error:
871 kfree(cm_id_priv);
872 return ERR_PTR(ret);
873}
874
875/*
876 * Make the ID visible to the MAD handlers and other threads that use the
877 * xarray.
878 */
879static void cm_finalize_id(struct cm_id_private *cm_id_priv)
880{
881 xa_store_irq(&cm.local_id_table, cm_local_id(cm_id_priv->id.local_id),
882 cm_id_priv, GFP_KERNEL);
883}
884
885struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
886 ib_cm_handler cm_handler,
887 void *context)
888{
889 struct cm_id_private *cm_id_priv;
890
891 cm_id_priv = cm_alloc_id_priv(device, cm_handler, context);
892 if (IS_ERR(cm_id_priv))
893 return ERR_CAST(cm_id_priv);
894
895 cm_finalize_id(cm_id_priv);
896 return &cm_id_priv->id;
897}
898EXPORT_SYMBOL(ib_create_cm_id);
899
900static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
901{
902 struct cm_work *work;
903
904 if (list_empty(&cm_id_priv->work_list))
905 return NULL;
906
907 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
908 list_del(&work->list);
909 return work;
910}
911
912static void cm_free_work(struct cm_work *work)
913{
914 if (work->mad_recv_wc)
915 ib_free_recv_mad(work->mad_recv_wc);
916 kfree(work);
917}
918
919static void cm_queue_work_unlock(struct cm_id_private *cm_id_priv,
920 struct cm_work *work)
921 __releases(&cm_id_priv->lock)
922{
923 bool immediate;
924
925 /*
926 * To deliver the event to the user callback we have the drop the
927 * spinlock, however, we need to ensure that the user callback is single
928 * threaded and receives events in the temporal order. If there are
929 * already events being processed then thread new events onto a list,
930 * the thread currently processing will pick them up.
931 */
932 immediate = atomic_inc_and_test(&cm_id_priv->work_count);
933 if (!immediate) {
934 list_add_tail(&work->list, &cm_id_priv->work_list);
935 /*
936 * This routine always consumes incoming reference. Once queued
937 * to the work_list then a reference is held by the thread
938 * currently running cm_process_work() and this reference is not
939 * needed.
940 */
941 cm_deref_id(cm_id_priv);
942 }
943 spin_unlock_irq(&cm_id_priv->lock);
944
945 if (immediate)
946 cm_process_work(cm_id_priv, work);
947}
948
949static inline int cm_convert_to_ms(int iba_time)
950{
951 /* approximate conversion to ms from 4.096us x 2^iba_time */
952 return 1 << max(iba_time - 8, 0);
953}
954
955/*
956 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
957 * Because of how ack_timeout is stored, adding one doubles the timeout.
958 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
959 * increment it (round up) only if the other is within 50%.
960 */
961static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
962{
963 int ack_timeout = packet_life_time + 1;
964
965 if (ack_timeout >= ca_ack_delay)
966 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
967 else
968 ack_timeout = ca_ack_delay +
969 (ack_timeout >= (ca_ack_delay - 1));
970
971 return min(31, ack_timeout);
972}
973
974static void cm_remove_remote(struct cm_id_private *cm_id_priv)
975{
976 struct cm_timewait_info *timewait_info = cm_id_priv->timewait_info;
977
978 if (timewait_info->inserted_remote_id) {
979 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
980 timewait_info->inserted_remote_id = 0;
981 }
982
983 if (timewait_info->inserted_remote_qp) {
984 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
985 timewait_info->inserted_remote_qp = 0;
986 }
987}
988
989static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
990{
991 struct cm_timewait_info *timewait_info;
992
993 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
994 if (!timewait_info)
995 return ERR_PTR(-ENOMEM);
996
997 timewait_info->work.local_id = local_id;
998 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
999 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
1000 return timewait_info;
1001}
1002
1003static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
1004{
1005 int wait_time;
1006 unsigned long flags;
1007 struct cm_device *cm_dev;
1008
1009 lockdep_assert_held(&cm_id_priv->lock);
1010
1011 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
1012 if (!cm_dev)
1013 return;
1014
1015 spin_lock_irqsave(&cm.lock, flags);
1016 cm_remove_remote(cm_id_priv);
1017 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
1018 spin_unlock_irqrestore(&cm.lock, flags);
1019
1020 /*
1021 * The cm_id could be destroyed by the user before we exit timewait.
1022 * To protect against this, we search for the cm_id after exiting
1023 * timewait before notifying the user that we've exited timewait.
1024 */
1025 cm_id_priv->id.state = IB_CM_TIMEWAIT;
1026 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
1027
1028 /* Check if the device started its remove_one */
1029 spin_lock_irqsave(&cm.lock, flags);
1030 if (!cm_dev->going_down)
1031 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
1032 msecs_to_jiffies(wait_time));
1033 spin_unlock_irqrestore(&cm.lock, flags);
1034
1035 /*
1036 * The timewait_info is converted into a work and gets freed during
1037 * cm_free_work() in cm_timewait_handler().
1038 */
1039 BUILD_BUG_ON(offsetof(struct cm_timewait_info, work) != 0);
1040 cm_id_priv->timewait_info = NULL;
1041}
1042
1043static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1044{
1045 unsigned long flags;
1046
1047 lockdep_assert_held(&cm_id_priv->lock);
1048
1049 cm_id_priv->id.state = IB_CM_IDLE;
1050 if (cm_id_priv->timewait_info) {
1051 spin_lock_irqsave(&cm.lock, flags);
1052 cm_remove_remote(cm_id_priv);
1053 spin_unlock_irqrestore(&cm.lock, flags);
1054 kfree(cm_id_priv->timewait_info);
1055 cm_id_priv->timewait_info = NULL;
1056 }
1057}
1058
1059static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1060{
1061 struct cm_id_private *cm_id_priv;
1062 struct cm_work *work;
1063
1064 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1065 spin_lock_irq(&cm_id_priv->lock);
1066retest:
1067 switch (cm_id->state) {
1068 case IB_CM_LISTEN:
1069 spin_lock(&cm.lock);
1070 if (--cm_id_priv->listen_sharecount > 0) {
1071 /* The id is still shared. */
1072 WARN_ON(refcount_read(&cm_id_priv->refcount) == 1);
1073 spin_unlock(&cm.lock);
1074 spin_unlock_irq(&cm_id_priv->lock);
1075 cm_deref_id(cm_id_priv);
1076 return;
1077 }
1078 cm_id->state = IB_CM_IDLE;
1079 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1080 RB_CLEAR_NODE(&cm_id_priv->service_node);
1081 spin_unlock(&cm.lock);
1082 break;
1083 case IB_CM_SIDR_REQ_SENT:
1084 cm_id->state = IB_CM_IDLE;
1085 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1086 break;
1087 case IB_CM_SIDR_REQ_RCVD:
1088 cm_send_sidr_rep_locked(cm_id_priv,
1089 &(struct ib_cm_sidr_rep_param){
1090 .status = IB_SIDR_REJECT });
1091 /* cm_send_sidr_rep_locked will not move to IDLE if it fails */
1092 cm_id->state = IB_CM_IDLE;
1093 break;
1094 case IB_CM_REQ_SENT:
1095 case IB_CM_MRA_REQ_RCVD:
1096 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1097 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_TIMEOUT,
1098 &cm_id_priv->id.device->node_guid,
1099 sizeof(cm_id_priv->id.device->node_guid),
1100 NULL, 0);
1101 break;
1102 case IB_CM_REQ_RCVD:
1103 if (err == -ENOMEM) {
1104 /* Do not reject to allow future retries. */
1105 cm_reset_to_idle(cm_id_priv);
1106 } else {
1107 cm_send_rej_locked(cm_id_priv,
1108 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
1109 NULL, 0);
1110 }
1111 break;
1112 case IB_CM_REP_SENT:
1113 case IB_CM_MRA_REP_RCVD:
1114 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1115 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1116 0, NULL, 0);
1117 goto retest;
1118 case IB_CM_MRA_REQ_SENT:
1119 case IB_CM_REP_RCVD:
1120 case IB_CM_MRA_REP_SENT:
1121 cm_send_rej_locked(cm_id_priv, IB_CM_REJ_CONSUMER_DEFINED, NULL,
1122 0, NULL, 0);
1123 break;
1124 case IB_CM_ESTABLISHED:
1125 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
1126 cm_id->state = IB_CM_IDLE;
1127 break;
1128 }
1129 cm_send_dreq_locked(cm_id_priv, NULL, 0);
1130 goto retest;
1131 case IB_CM_DREQ_SENT:
1132 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1133 cm_enter_timewait(cm_id_priv);
1134 goto retest;
1135 case IB_CM_DREQ_RCVD:
1136 cm_send_drep_locked(cm_id_priv, NULL, 0);
1137 WARN_ON(cm_id->state != IB_CM_TIMEWAIT);
1138 goto retest;
1139 case IB_CM_TIMEWAIT:
1140 /*
1141 * The cm_acquire_id in cm_timewait_handler will stop working
1142 * once we do xa_erase below, so just move to idle here for
1143 * consistency.
1144 */
1145 cm_id->state = IB_CM_IDLE;
1146 break;
1147 case IB_CM_IDLE:
1148 break;
1149 }
1150 WARN_ON(cm_id->state != IB_CM_IDLE);
1151
1152 spin_lock(&cm.lock);
1153 /* Required for cleanup paths related cm_req_handler() */
1154 if (cm_id_priv->timewait_info) {
1155 cm_remove_remote(cm_id_priv);
1156 kfree(cm_id_priv->timewait_info);
1157 cm_id_priv->timewait_info = NULL;
1158 }
1159 if (!list_empty(&cm_id_priv->altr_list) &&
1160 (!cm_id_priv->altr_send_port_not_ready))
1161 list_del(&cm_id_priv->altr_list);
1162 if (!list_empty(&cm_id_priv->prim_list) &&
1163 (!cm_id_priv->prim_send_port_not_ready))
1164 list_del(&cm_id_priv->prim_list);
1165 WARN_ON(cm_id_priv->listen_sharecount);
1166 WARN_ON(!RB_EMPTY_NODE(&cm_id_priv->service_node));
1167 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1168 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
1169 spin_unlock(&cm.lock);
1170 spin_unlock_irq(&cm_id_priv->lock);
1171
1172 xa_erase_irq(&cm.local_id_table, cm_local_id(cm_id->local_id));
1173 cm_deref_id(cm_id_priv);
1174 wait_for_completion(&cm_id_priv->comp);
1175 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1176 cm_free_work(work);
1177
1178 rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr);
1179 rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr);
1180 kfree(cm_id_priv->private_data);
1181 kfree_rcu(cm_id_priv, rcu);
1182}
1183
1184void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1185{
1186 cm_destroy_id(cm_id, 0);
1187}
1188EXPORT_SYMBOL(ib_destroy_cm_id);
1189
1190static int cm_init_listen(struct cm_id_private *cm_id_priv, __be64 service_id,
1191 __be64 service_mask)
1192{
1193 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
1194 service_id &= service_mask;
1195 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1196 (service_id != IB_CM_ASSIGN_SERVICE_ID))
1197 return -EINVAL;
1198
1199 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
1200 cm_id_priv->id.service_id = cpu_to_be64(cm.listen_service_id++);
1201 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1202 } else {
1203 cm_id_priv->id.service_id = service_id;
1204 cm_id_priv->id.service_mask = service_mask;
1205 }
1206 return 0;
1207}
1208
1209/**
1210 * ib_cm_listen - Initiates listening on the specified service ID for
1211 * connection and service ID resolution requests.
1212 * @cm_id: Connection identifier associated with the listen request.
1213 * @service_id: Service identifier matched against incoming connection
1214 * and service ID resolution requests. The service ID should be specified
1215 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1216 * assign a service ID to the caller.
1217 * @service_mask: Mask applied to service ID used to listen across a
1218 * range of service IDs. If set to 0, the service ID is matched
1219 * exactly. This parameter is ignored if %service_id is set to
1220 * IB_CM_ASSIGN_SERVICE_ID.
1221 */
1222int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
1223{
1224 struct cm_id_private *cm_id_priv =
1225 container_of(cm_id, struct cm_id_private, id);
1226 unsigned long flags;
1227 int ret;
1228
1229 spin_lock_irqsave(&cm_id_priv->lock, flags);
1230 if (cm_id_priv->id.state != IB_CM_IDLE) {
1231 ret = -EINVAL;
1232 goto out;
1233 }
1234
1235 ret = cm_init_listen(cm_id_priv, service_id, service_mask);
1236 if (ret)
1237 goto out;
1238
1239 if (!cm_insert_listen(cm_id_priv, NULL)) {
1240 ret = -EBUSY;
1241 goto out;
1242 }
1243
1244 cm_id_priv->id.state = IB_CM_LISTEN;
1245 ret = 0;
1246
1247out:
1248 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1249 return ret;
1250}
1251EXPORT_SYMBOL(ib_cm_listen);
1252
1253/**
1254 * Create a new listening ib_cm_id and listen on the given service ID.
1255 *
1256 * If there's an existing ID listening on that same device and service ID,
1257 * return it.
1258 *
1259 * @device: Device associated with the cm_id. All related communication will
1260 * be associated with the specified device.
1261 * @cm_handler: Callback invoked to notify the user of CM events.
1262 * @service_id: Service identifier matched against incoming connection
1263 * and service ID resolution requests. The service ID should be specified
1264 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1265 * assign a service ID to the caller.
1266 *
1267 * Callers should call ib_destroy_cm_id when done with the listener ID.
1268 */
1269struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1270 ib_cm_handler cm_handler,
1271 __be64 service_id)
1272{
1273 struct cm_id_private *listen_id_priv;
1274 struct cm_id_private *cm_id_priv;
1275 int err = 0;
1276
1277 /* Create an ID in advance, since the creation may sleep */
1278 cm_id_priv = cm_alloc_id_priv(device, cm_handler, NULL);
1279 if (IS_ERR(cm_id_priv))
1280 return ERR_CAST(cm_id_priv);
1281
1282 err = cm_init_listen(cm_id_priv, service_id, 0);
1283 if (err)
1284 return ERR_PTR(err);
1285
1286 spin_lock_irq(&cm_id_priv->lock);
1287 listen_id_priv = cm_insert_listen(cm_id_priv, cm_handler);
1288 if (listen_id_priv != cm_id_priv) {
1289 spin_unlock_irq(&cm_id_priv->lock);
1290 ib_destroy_cm_id(&cm_id_priv->id);
1291 if (!listen_id_priv)
1292 return ERR_PTR(-EINVAL);
1293 return &listen_id_priv->id;
1294 }
1295 cm_id_priv->id.state = IB_CM_LISTEN;
1296 spin_unlock_irq(&cm_id_priv->lock);
1297
1298 /*
1299 * A listen ID does not need to be in the xarray since it does not
1300 * receive mads, is not placed in the remote_id or remote_qpn rbtree,
1301 * and does not enter timewait.
1302 */
1303
1304 return &cm_id_priv->id;
1305}
1306EXPORT_SYMBOL(ib_cm_insert_listen);
1307
1308static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1309{
1310 u64 hi_tid, low_tid;
1311
1312 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1313 low_tid = (u64)cm_id_priv->id.local_id;
1314 return cpu_to_be64(hi_tid | low_tid);
1315}
1316
1317static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1318 __be16 attr_id, __be64 tid)
1319{
1320 hdr->base_version = IB_MGMT_BASE_VERSION;
1321 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1322 hdr->class_version = IB_CM_CLASS_VERSION;
1323 hdr->method = IB_MGMT_METHOD_SEND;
1324 hdr->attr_id = attr_id;
1325 hdr->tid = tid;
1326}
1327
1328static void cm_format_mad_ece_hdr(struct ib_mad_hdr *hdr, __be16 attr_id,
1329 __be64 tid, u32 attr_mod)
1330{
1331 cm_format_mad_hdr(hdr, attr_id, tid);
1332 hdr->attr_mod = cpu_to_be32(attr_mod);
1333}
1334
1335static void cm_format_req(struct cm_req_msg *req_msg,
1336 struct cm_id_private *cm_id_priv,
1337 struct ib_cm_req_param *param)
1338{
1339 struct sa_path_rec *pri_path = param->primary_path;
1340 struct sa_path_rec *alt_path = param->alternate_path;
1341 bool pri_ext = false;
1342
1343 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1344 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1345 pri_path->opa.slid);
1346
1347 cm_format_mad_ece_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1348 cm_form_tid(cm_id_priv), param->ece.attr_mod);
1349
1350 IBA_SET(CM_REQ_LOCAL_COMM_ID, req_msg,
1351 be32_to_cpu(cm_id_priv->id.local_id));
1352 IBA_SET(CM_REQ_SERVICE_ID, req_msg, be64_to_cpu(param->service_id));
1353 IBA_SET(CM_REQ_LOCAL_CA_GUID, req_msg,
1354 be64_to_cpu(cm_id_priv->id.device->node_guid));
1355 IBA_SET(CM_REQ_LOCAL_QPN, req_msg, param->qp_num);
1356 IBA_SET(CM_REQ_INITIATOR_DEPTH, req_msg, param->initiator_depth);
1357 IBA_SET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg,
1358 param->remote_cm_response_timeout);
1359 cm_req_set_qp_type(req_msg, param->qp_type);
1360 IBA_SET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg, param->flow_control);
1361 IBA_SET(CM_REQ_STARTING_PSN, req_msg, param->starting_psn);
1362 IBA_SET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg,
1363 param->local_cm_response_timeout);
1364 IBA_SET(CM_REQ_PARTITION_KEY, req_msg,
1365 be16_to_cpu(param->primary_path->pkey));
1366 IBA_SET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg,
1367 param->primary_path->mtu);
1368 IBA_SET(CM_REQ_MAX_CM_RETRIES, req_msg, param->max_cm_retries);
1369
1370 if (param->qp_type != IB_QPT_XRC_INI) {
1371 IBA_SET(CM_REQ_RESPONDER_RESOURCES, req_msg,
1372 param->responder_resources);
1373 IBA_SET(CM_REQ_RETRY_COUNT, req_msg, param->retry_count);
1374 IBA_SET(CM_REQ_RNR_RETRY_COUNT, req_msg,
1375 param->rnr_retry_count);
1376 IBA_SET(CM_REQ_SRQ, req_msg, param->srq);
1377 }
1378
1379 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg) =
1380 pri_path->sgid;
1381 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg) =
1382 pri_path->dgid;
1383 if (pri_ext) {
1384 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg)
1385 ->global.interface_id =
1386 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1387 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg)
1388 ->global.interface_id =
1389 OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1390 }
1391 if (pri_path->hop_limit <= 1) {
1392 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1393 be16_to_cpu(pri_ext ? 0 :
1394 htons(ntohl(sa_path_get_slid(
1395 pri_path)))));
1396 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1397 be16_to_cpu(pri_ext ? 0 :
1398 htons(ntohl(sa_path_get_dlid(
1399 pri_path)))));
1400 } else {
1401 /* Work-around until there's a way to obtain remote LID info */
1402 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
1403 be16_to_cpu(IB_LID_PERMISSIVE));
1404 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
1405 be16_to_cpu(IB_LID_PERMISSIVE));
1406 }
1407 IBA_SET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg,
1408 be32_to_cpu(pri_path->flow_label));
1409 IBA_SET(CM_REQ_PRIMARY_PACKET_RATE, req_msg, pri_path->rate);
1410 IBA_SET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg, pri_path->traffic_class);
1411 IBA_SET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg, pri_path->hop_limit);
1412 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, pri_path->sl);
1413 IBA_SET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg,
1414 (pri_path->hop_limit <= 1));
1415 IBA_SET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg,
1416 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1417 pri_path->packet_life_time));
1418
1419 if (alt_path) {
1420 bool alt_ext = false;
1421
1422 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1423 alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1424 alt_path->opa.slid);
1425
1426 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg) =
1427 alt_path->sgid;
1428 *IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg) =
1429 alt_path->dgid;
1430 if (alt_ext) {
1431 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1432 req_msg)
1433 ->global.interface_id =
1434 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1435 IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_REMOTE_PORT_GID,
1436 req_msg)
1437 ->global.interface_id =
1438 OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1439 }
1440 if (alt_path->hop_limit <= 1) {
1441 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1442 be16_to_cpu(
1443 alt_ext ? 0 :
1444 htons(ntohl(sa_path_get_slid(
1445 alt_path)))));
1446 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1447 be16_to_cpu(
1448 alt_ext ? 0 :
1449 htons(ntohl(sa_path_get_dlid(
1450 alt_path)))));
1451 } else {
1452 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
1453 be16_to_cpu(IB_LID_PERMISSIVE));
1454 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
1455 be16_to_cpu(IB_LID_PERMISSIVE));
1456 }
1457 IBA_SET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg,
1458 be32_to_cpu(alt_path->flow_label));
1459 IBA_SET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg, alt_path->rate);
1460 IBA_SET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg,
1461 alt_path->traffic_class);
1462 IBA_SET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg,
1463 alt_path->hop_limit);
1464 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, alt_path->sl);
1465 IBA_SET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg,
1466 (alt_path->hop_limit <= 1));
1467 IBA_SET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg,
1468 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1469 alt_path->packet_life_time));
1470 }
1471 IBA_SET(CM_REQ_VENDOR_ID, req_msg, param->ece.vendor_id);
1472
1473 if (param->private_data && param->private_data_len)
1474 IBA_SET_MEM(CM_REQ_PRIVATE_DATA, req_msg, param->private_data,
1475 param->private_data_len);
1476}
1477
1478static int cm_validate_req_param(struct ib_cm_req_param *param)
1479{
1480 if (!param->primary_path)
1481 return -EINVAL;
1482
1483 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1484 param->qp_type != IB_QPT_XRC_INI)
1485 return -EINVAL;
1486
1487 if (param->private_data &&
1488 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1489 return -EINVAL;
1490
1491 if (param->alternate_path &&
1492 (param->alternate_path->pkey != param->primary_path->pkey ||
1493 param->alternate_path->mtu != param->primary_path->mtu))
1494 return -EINVAL;
1495
1496 return 0;
1497}
1498
1499int ib_send_cm_req(struct ib_cm_id *cm_id,
1500 struct ib_cm_req_param *param)
1501{
1502 struct cm_id_private *cm_id_priv;
1503 struct cm_req_msg *req_msg;
1504 unsigned long flags;
1505 int ret;
1506
1507 ret = cm_validate_req_param(param);
1508 if (ret)
1509 return ret;
1510
1511 /* Verify that we're not in timewait. */
1512 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1513 spin_lock_irqsave(&cm_id_priv->lock, flags);
1514 if (cm_id->state != IB_CM_IDLE || WARN_ON(cm_id_priv->timewait_info)) {
1515 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1516 ret = -EINVAL;
1517 goto out;
1518 }
1519 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1520
1521 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1522 id.local_id);
1523 if (IS_ERR(cm_id_priv->timewait_info)) {
1524 ret = PTR_ERR(cm_id_priv->timewait_info);
1525 goto out;
1526 }
1527
1528 ret = cm_init_av_by_path(param->primary_path,
1529 param->ppath_sgid_attr, &cm_id_priv->av,
1530 cm_id_priv);
1531 if (ret)
1532 goto out;
1533 if (param->alternate_path) {
1534 ret = cm_init_av_by_path(param->alternate_path, NULL,
1535 &cm_id_priv->alt_av, cm_id_priv);
1536 if (ret)
1537 goto out;
1538 }
1539 cm_id->service_id = param->service_id;
1540 cm_id->service_mask = ~cpu_to_be64(0);
1541 cm_id_priv->timeout_ms = cm_convert_to_ms(
1542 param->primary_path->packet_life_time) * 2 +
1543 cm_convert_to_ms(
1544 param->remote_cm_response_timeout);
1545 cm_id_priv->max_cm_retries = param->max_cm_retries;
1546 cm_id_priv->initiator_depth = param->initiator_depth;
1547 cm_id_priv->responder_resources = param->responder_resources;
1548 cm_id_priv->retry_count = param->retry_count;
1549 cm_id_priv->path_mtu = param->primary_path->mtu;
1550 cm_id_priv->pkey = param->primary_path->pkey;
1551 cm_id_priv->qp_type = param->qp_type;
1552
1553 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1554 if (ret)
1555 goto out;
1556
1557 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1558 cm_format_req(req_msg, cm_id_priv, param);
1559 cm_id_priv->tid = req_msg->hdr.tid;
1560 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1561 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1562
1563 cm_id_priv->local_qpn = cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
1564 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
1565
1566 spin_lock_irqsave(&cm_id_priv->lock, flags);
1567 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1568 if (ret) {
1569 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1570 goto error2;
1571 }
1572 BUG_ON(cm_id->state != IB_CM_IDLE);
1573 cm_id->state = IB_CM_REQ_SENT;
1574 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1575 return 0;
1576
1577error2: cm_free_msg(cm_id_priv->msg);
1578out: return ret;
1579}
1580EXPORT_SYMBOL(ib_send_cm_req);
1581
1582static int cm_issue_rej(struct cm_port *port,
1583 struct ib_mad_recv_wc *mad_recv_wc,
1584 enum ib_cm_rej_reason reason,
1585 enum cm_msg_response msg_rejected,
1586 void *ari, u8 ari_length)
1587{
1588 struct ib_mad_send_buf *msg = NULL;
1589 struct cm_rej_msg *rej_msg, *rcv_msg;
1590 int ret;
1591
1592 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1593 if (ret)
1594 return ret;
1595
1596 /* We just need common CM header information. Cast to any message. */
1597 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1598 rej_msg = (struct cm_rej_msg *) msg->mad;
1599
1600 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1601 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1602 IBA_GET(CM_REJ_LOCAL_COMM_ID, rcv_msg));
1603 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1604 IBA_GET(CM_REJ_REMOTE_COMM_ID, rcv_msg));
1605 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, msg_rejected);
1606 IBA_SET(CM_REJ_REASON, rej_msg, reason);
1607
1608 if (ari && ari_length) {
1609 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1610 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1611 }
1612
1613 ret = ib_post_send_mad(msg, NULL);
1614 if (ret)
1615 cm_free_msg(msg);
1616
1617 return ret;
1618}
1619
1620static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1621{
1622 return ((cpu_to_be16(
1623 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg))) ||
1624 (ib_is_opa_gid(IBA_GET_MEM_PTR(CM_REQ_ALTERNATE_LOCAL_PORT_GID,
1625 req_msg))));
1626}
1627
1628static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num,
1629 struct sa_path_rec *path, union ib_gid *gid)
1630{
1631 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1632 path->rec_type = SA_PATH_REC_TYPE_OPA;
1633 else
1634 path->rec_type = SA_PATH_REC_TYPE_IB;
1635}
1636
1637static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1638 struct sa_path_rec *primary_path,
1639 struct sa_path_rec *alt_path)
1640{
1641 u32 lid;
1642
1643 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1644 sa_path_set_dlid(primary_path,
1645 IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
1646 req_msg));
1647 sa_path_set_slid(primary_path,
1648 IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
1649 req_msg));
1650 } else {
1651 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1652 CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg));
1653 sa_path_set_dlid(primary_path, lid);
1654
1655 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1656 CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg));
1657 sa_path_set_slid(primary_path, lid);
1658 }
1659
1660 if (!cm_req_has_alt_path(req_msg))
1661 return;
1662
1663 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1664 sa_path_set_dlid(alt_path,
1665 IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
1666 req_msg));
1667 sa_path_set_slid(alt_path,
1668 IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
1669 req_msg));
1670 } else {
1671 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1672 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg));
1673 sa_path_set_dlid(alt_path, lid);
1674
1675 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
1676 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg));
1677 sa_path_set_slid(alt_path, lid);
1678 }
1679}
1680
1681static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1682 struct sa_path_rec *primary_path,
1683 struct sa_path_rec *alt_path)
1684{
1685 primary_path->dgid =
1686 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID, req_msg);
1687 primary_path->sgid =
1688 *IBA_GET_MEM_PTR(CM_REQ_PRIMARY_REMOTE_PORT_GID, req_msg);
1689 primary_path->flow_label =
1690 cpu_to_be32(IBA_GET(CM_REQ_PRIMARY_FLOW_LABEL, req_msg));
1691 primary_path->hop_limit = IBA_GET(CM_REQ_PRIMARY_HOP_LIMIT, req_msg);
1692 primary_path->traffic_class =
1693 IBA_GET(CM_REQ_PRIMARY_TRAFFIC_CLASS, req_msg);
1694 primary_path->reversible = 1;
1695 primary_path->pkey =
1696 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1697 primary_path->sl = IBA_GET(CM_REQ_PRIMARY_SL, req_msg);
1698 primary_path->mtu_selector = IB_SA_EQ;
1699 primary_path->mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1700 primary_path->rate_selector = IB_SA_EQ;
1701 primary_path->rate = IBA_GET(CM_REQ_PRIMARY_PACKET_RATE, req_msg);
1702 primary_path->packet_life_time_selector = IB_SA_EQ;
1703 primary_path->packet_life_time =
1704 IBA_GET(CM_REQ_PRIMARY_LOCAL_ACK_TIMEOUT, req_msg);
1705 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1706 primary_path->service_id =
1707 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1708 if (sa_path_is_roce(primary_path))
1709 primary_path->roce.route_resolved = false;
1710
1711 if (cm_req_has_alt_path(req_msg)) {
1712 alt_path->dgid = *IBA_GET_MEM_PTR(
1713 CM_REQ_ALTERNATE_LOCAL_PORT_GID, req_msg);
1714 alt_path->sgid = *IBA_GET_MEM_PTR(
1715 CM_REQ_ALTERNATE_REMOTE_PORT_GID, req_msg);
1716 alt_path->flow_label = cpu_to_be32(
1717 IBA_GET(CM_REQ_ALTERNATE_FLOW_LABEL, req_msg));
1718 alt_path->hop_limit =
1719 IBA_GET(CM_REQ_ALTERNATE_HOP_LIMIT, req_msg);
1720 alt_path->traffic_class =
1721 IBA_GET(CM_REQ_ALTERNATE_TRAFFIC_CLASS, req_msg);
1722 alt_path->reversible = 1;
1723 alt_path->pkey =
1724 cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
1725 alt_path->sl = IBA_GET(CM_REQ_ALTERNATE_SL, req_msg);
1726 alt_path->mtu_selector = IB_SA_EQ;
1727 alt_path->mtu =
1728 IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
1729 alt_path->rate_selector = IB_SA_EQ;
1730 alt_path->rate = IBA_GET(CM_REQ_ALTERNATE_PACKET_RATE, req_msg);
1731 alt_path->packet_life_time_selector = IB_SA_EQ;
1732 alt_path->packet_life_time =
1733 IBA_GET(CM_REQ_ALTERNATE_LOCAL_ACK_TIMEOUT, req_msg);
1734 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1735 alt_path->service_id =
1736 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
1737
1738 if (sa_path_is_roce(alt_path))
1739 alt_path->roce.route_resolved = false;
1740 }
1741 cm_format_path_lid_from_req(req_msg, primary_path, alt_path);
1742}
1743
1744static u16 cm_get_bth_pkey(struct cm_work *work)
1745{
1746 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1747 u8 port_num = work->port->port_num;
1748 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1749 u16 pkey;
1750 int ret;
1751
1752 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1753 if (ret) {
1754 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1755 port_num, pkey_index, ret);
1756 return 0;
1757 }
1758
1759 return pkey;
1760}
1761
1762/**
1763 * Convert OPA SGID to IB SGID
1764 * ULPs (such as IPoIB) do not understand OPA GIDs and will
1765 * reject them as the local_gid will not match the sgid. Therefore,
1766 * change the pathrec's SGID to an IB SGID.
1767 *
1768 * @work: Work completion
1769 * @path: Path record
1770 */
1771static void cm_opa_to_ib_sgid(struct cm_work *work,
1772 struct sa_path_rec *path)
1773{
1774 struct ib_device *dev = work->port->cm_dev->ib_device;
1775 u8 port_num = work->port->port_num;
1776
1777 if (rdma_cap_opa_ah(dev, port_num) &&
1778 (ib_is_opa_gid(&path->sgid))) {
1779 union ib_gid sgid;
1780
1781 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1782 dev_warn(&dev->dev,
1783 "Error updating sgid in CM request\n");
1784 return;
1785 }
1786
1787 path->sgid = sgid;
1788 }
1789}
1790
1791static void cm_format_req_event(struct cm_work *work,
1792 struct cm_id_private *cm_id_priv,
1793 struct ib_cm_id *listen_id)
1794{
1795 struct cm_req_msg *req_msg;
1796 struct ib_cm_req_event_param *param;
1797
1798 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1799 param = &work->cm_event.param.req_rcvd;
1800 param->listen_id = listen_id;
1801 param->bth_pkey = cm_get_bth_pkey(work);
1802 param->port = cm_id_priv->av.port->port_num;
1803 param->primary_path = &work->path[0];
1804 cm_opa_to_ib_sgid(work, param->primary_path);
1805 if (cm_req_has_alt_path(req_msg)) {
1806 param->alternate_path = &work->path[1];
1807 cm_opa_to_ib_sgid(work, param->alternate_path);
1808 } else {
1809 param->alternate_path = NULL;
1810 }
1811 param->remote_ca_guid =
1812 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
1813 param->remote_qkey = IBA_GET(CM_REQ_LOCAL_Q_KEY, req_msg);
1814 param->remote_qpn = IBA_GET(CM_REQ_LOCAL_QPN, req_msg);
1815 param->qp_type = cm_req_get_qp_type(req_msg);
1816 param->starting_psn = IBA_GET(CM_REQ_STARTING_PSN, req_msg);
1817 param->responder_resources = IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
1818 param->initiator_depth = IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
1819 param->local_cm_response_timeout =
1820 IBA_GET(CM_REQ_REMOTE_CM_RESPONSE_TIMEOUT, req_msg);
1821 param->flow_control = IBA_GET(CM_REQ_END_TO_END_FLOW_CONTROL, req_msg);
1822 param->remote_cm_response_timeout =
1823 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg);
1824 param->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
1825 param->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
1826 param->srq = IBA_GET(CM_REQ_SRQ, req_msg);
1827 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1828 param->ece.vendor_id = IBA_GET(CM_REQ_VENDOR_ID, req_msg);
1829 param->ece.attr_mod = be32_to_cpu(req_msg->hdr.attr_mod);
1830
1831 work->cm_event.private_data =
1832 IBA_GET_MEM_PTR(CM_REQ_PRIVATE_DATA, req_msg);
1833}
1834
1835static void cm_process_work(struct cm_id_private *cm_id_priv,
1836 struct cm_work *work)
1837{
1838 int ret;
1839
1840 /* We will typically only have the current event to report. */
1841 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1842 cm_free_work(work);
1843
1844 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1845 spin_lock_irq(&cm_id_priv->lock);
1846 work = cm_dequeue_work(cm_id_priv);
1847 spin_unlock_irq(&cm_id_priv->lock);
1848 if (!work)
1849 return;
1850
1851 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1852 &work->cm_event);
1853 cm_free_work(work);
1854 }
1855 cm_deref_id(cm_id_priv);
1856 if (ret)
1857 cm_destroy_id(&cm_id_priv->id, ret);
1858}
1859
1860static void cm_format_mra(struct cm_mra_msg *mra_msg,
1861 struct cm_id_private *cm_id_priv,
1862 enum cm_msg_response msg_mraed, u8 service_timeout,
1863 const void *private_data, u8 private_data_len)
1864{
1865 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1866 IBA_SET(CM_MRA_MESSAGE_MRAED, mra_msg, msg_mraed);
1867 IBA_SET(CM_MRA_LOCAL_COMM_ID, mra_msg,
1868 be32_to_cpu(cm_id_priv->id.local_id));
1869 IBA_SET(CM_MRA_REMOTE_COMM_ID, mra_msg,
1870 be32_to_cpu(cm_id_priv->id.remote_id));
1871 IBA_SET(CM_MRA_SERVICE_TIMEOUT, mra_msg, service_timeout);
1872
1873 if (private_data && private_data_len)
1874 IBA_SET_MEM(CM_MRA_PRIVATE_DATA, mra_msg, private_data,
1875 private_data_len);
1876}
1877
1878static void cm_format_rej(struct cm_rej_msg *rej_msg,
1879 struct cm_id_private *cm_id_priv,
1880 enum ib_cm_rej_reason reason, void *ari,
1881 u8 ari_length, const void *private_data,
1882 u8 private_data_len, enum ib_cm_state state)
1883{
1884 lockdep_assert_held(&cm_id_priv->lock);
1885
1886 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1887 IBA_SET(CM_REJ_REMOTE_COMM_ID, rej_msg,
1888 be32_to_cpu(cm_id_priv->id.remote_id));
1889
1890 switch (state) {
1891 case IB_CM_REQ_RCVD:
1892 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg, be32_to_cpu(0));
1893 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1894 break;
1895 case IB_CM_MRA_REQ_SENT:
1896 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1897 be32_to_cpu(cm_id_priv->id.local_id));
1898 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REQ);
1899 break;
1900 case IB_CM_REP_RCVD:
1901 case IB_CM_MRA_REP_SENT:
1902 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1903 be32_to_cpu(cm_id_priv->id.local_id));
1904 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg, CM_MSG_RESPONSE_REP);
1905 break;
1906 default:
1907 IBA_SET(CM_REJ_LOCAL_COMM_ID, rej_msg,
1908 be32_to_cpu(cm_id_priv->id.local_id));
1909 IBA_SET(CM_REJ_MESSAGE_REJECTED, rej_msg,
1910 CM_MSG_RESPONSE_OTHER);
1911 break;
1912 }
1913
1914 IBA_SET(CM_REJ_REASON, rej_msg, reason);
1915 if (ari && ari_length) {
1916 IBA_SET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg, ari_length);
1917 IBA_SET_MEM(CM_REJ_ARI, rej_msg, ari, ari_length);
1918 }
1919
1920 if (private_data && private_data_len)
1921 IBA_SET_MEM(CM_REJ_PRIVATE_DATA, rej_msg, private_data,
1922 private_data_len);
1923}
1924
1925static void cm_dup_req_handler(struct cm_work *work,
1926 struct cm_id_private *cm_id_priv)
1927{
1928 struct ib_mad_send_buf *msg = NULL;
1929 int ret;
1930
1931 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1932 counter[CM_REQ_COUNTER]);
1933
1934 /* Quick state check to discard duplicate REQs. */
1935 spin_lock_irq(&cm_id_priv->lock);
1936 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
1937 spin_unlock_irq(&cm_id_priv->lock);
1938 return;
1939 }
1940 spin_unlock_irq(&cm_id_priv->lock);
1941
1942 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1943 if (ret)
1944 return;
1945
1946 spin_lock_irq(&cm_id_priv->lock);
1947 switch (cm_id_priv->id.state) {
1948 case IB_CM_MRA_REQ_SENT:
1949 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1950 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1951 cm_id_priv->private_data,
1952 cm_id_priv->private_data_len);
1953 break;
1954 case IB_CM_TIMEWAIT:
1955 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv,
1956 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0,
1957 IB_CM_TIMEWAIT);
1958 break;
1959 default:
1960 goto unlock;
1961 }
1962 spin_unlock_irq(&cm_id_priv->lock);
1963
1964 ret = ib_post_send_mad(msg, NULL);
1965 if (ret)
1966 goto free;
1967 return;
1968
1969unlock: spin_unlock_irq(&cm_id_priv->lock);
1970free: cm_free_msg(msg);
1971}
1972
1973static struct cm_id_private * cm_match_req(struct cm_work *work,
1974 struct cm_id_private *cm_id_priv)
1975{
1976 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1977 struct cm_timewait_info *timewait_info;
1978 struct cm_req_msg *req_msg;
1979
1980 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1981
1982 /* Check for possible duplicate REQ. */
1983 spin_lock_irq(&cm.lock);
1984 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1985 if (timewait_info) {
1986 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
1987 timewait_info->work.remote_id);
1988 spin_unlock_irq(&cm.lock);
1989 if (cur_cm_id_priv) {
1990 cm_dup_req_handler(work, cur_cm_id_priv);
1991 cm_deref_id(cur_cm_id_priv);
1992 }
1993 return NULL;
1994 }
1995
1996 /* Check for stale connections. */
1997 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1998 if (timewait_info) {
1999 cm_remove_remote(cm_id_priv);
2000 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2001 timewait_info->work.remote_id);
2002
2003 spin_unlock_irq(&cm.lock);
2004 cm_issue_rej(work->port, work->mad_recv_wc,
2005 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
2006 NULL, 0);
2007 if (cur_cm_id_priv) {
2008 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2009 cm_deref_id(cur_cm_id_priv);
2010 }
2011 return NULL;
2012 }
2013
2014 /* Find matching listen request. */
2015 listen_cm_id_priv = cm_find_listen(
2016 cm_id_priv->id.device,
2017 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg)));
2018 if (!listen_cm_id_priv) {
2019 cm_remove_remote(cm_id_priv);
2020 spin_unlock_irq(&cm.lock);
2021 cm_issue_rej(work->port, work->mad_recv_wc,
2022 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
2023 NULL, 0);
2024 return NULL;
2025 }
2026 spin_unlock_irq(&cm.lock);
2027 return listen_cm_id_priv;
2028}
2029
2030/*
2031 * Work-around for inter-subnet connections. If the LIDs are permissive,
2032 * we need to override the LID/SL data in the REQ with the LID information
2033 * in the work completion.
2034 */
2035static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
2036{
2037 if (!IBA_GET(CM_REQ_PRIMARY_SUBNET_LOCAL, req_msg)) {
2038 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_LOCAL_PORT_LID,
2039 req_msg)) == IB_LID_PERMISSIVE) {
2040 IBA_SET(CM_REQ_PRIMARY_LOCAL_PORT_LID, req_msg,
2041 be16_to_cpu(ib_lid_be16(wc->slid)));
2042 IBA_SET(CM_REQ_PRIMARY_SL, req_msg, wc->sl);
2043 }
2044
2045 if (cpu_to_be16(IBA_GET(CM_REQ_PRIMARY_REMOTE_PORT_LID,
2046 req_msg)) == IB_LID_PERMISSIVE)
2047 IBA_SET(CM_REQ_PRIMARY_REMOTE_PORT_LID, req_msg,
2048 wc->dlid_path_bits);
2049 }
2050
2051 if (!IBA_GET(CM_REQ_ALTERNATE_SUBNET_LOCAL, req_msg)) {
2052 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_LOCAL_PORT_LID,
2053 req_msg)) == IB_LID_PERMISSIVE) {
2054 IBA_SET(CM_REQ_ALTERNATE_LOCAL_PORT_LID, req_msg,
2055 be16_to_cpu(ib_lid_be16(wc->slid)));
2056 IBA_SET(CM_REQ_ALTERNATE_SL, req_msg, wc->sl);
2057 }
2058
2059 if (cpu_to_be16(IBA_GET(CM_REQ_ALTERNATE_REMOTE_PORT_LID,
2060 req_msg)) == IB_LID_PERMISSIVE)
2061 IBA_SET(CM_REQ_ALTERNATE_REMOTE_PORT_LID, req_msg,
2062 wc->dlid_path_bits);
2063 }
2064}
2065
2066static int cm_req_handler(struct cm_work *work)
2067{
2068 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
2069 struct cm_req_msg *req_msg;
2070 const struct ib_global_route *grh;
2071 const struct ib_gid_attr *gid_attr;
2072 int ret;
2073
2074 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
2075
2076 cm_id_priv =
2077 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
2078 if (IS_ERR(cm_id_priv))
2079 return PTR_ERR(cm_id_priv);
2080
2081 cm_id_priv->id.remote_id =
2082 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_COMM_ID, req_msg));
2083 cm_id_priv->id.service_id =
2084 cpu_to_be64(IBA_GET(CM_REQ_SERVICE_ID, req_msg));
2085 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
2086 cm_id_priv->tid = req_msg->hdr.tid;
2087 cm_id_priv->timeout_ms = cm_convert_to_ms(
2088 IBA_GET(CM_REQ_LOCAL_CM_RESPONSE_TIMEOUT, req_msg));
2089 cm_id_priv->max_cm_retries = IBA_GET(CM_REQ_MAX_CM_RETRIES, req_msg);
2090 cm_id_priv->remote_qpn =
2091 cpu_to_be32(IBA_GET(CM_REQ_LOCAL_QPN, req_msg));
2092 cm_id_priv->initiator_depth =
2093 IBA_GET(CM_REQ_RESPONDER_RESOURCES, req_msg);
2094 cm_id_priv->responder_resources =
2095 IBA_GET(CM_REQ_INITIATOR_DEPTH, req_msg);
2096 cm_id_priv->path_mtu = IBA_GET(CM_REQ_PATH_PACKET_PAYLOAD_MTU, req_msg);
2097 cm_id_priv->pkey = cpu_to_be16(IBA_GET(CM_REQ_PARTITION_KEY, req_msg));
2098 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REQ_STARTING_PSN, req_msg));
2099 cm_id_priv->retry_count = IBA_GET(CM_REQ_RETRY_COUNT, req_msg);
2100 cm_id_priv->rnr_retry_count = IBA_GET(CM_REQ_RNR_RETRY_COUNT, req_msg);
2101 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2102
2103 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2104 work->mad_recv_wc->recv_buf.grh,
2105 &cm_id_priv->av);
2106 if (ret)
2107 goto destroy;
2108 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
2109 id.local_id);
2110 if (IS_ERR(cm_id_priv->timewait_info)) {
2111 ret = PTR_ERR(cm_id_priv->timewait_info);
2112 goto destroy;
2113 }
2114 cm_id_priv->timewait_info->work.remote_id = cm_id_priv->id.remote_id;
2115 cm_id_priv->timewait_info->remote_ca_guid =
2116 cpu_to_be64(IBA_GET(CM_REQ_LOCAL_CA_GUID, req_msg));
2117 cm_id_priv->timewait_info->remote_qpn = cm_id_priv->remote_qpn;
2118
2119 /*
2120 * Note that the ID pointer is not in the xarray at this point,
2121 * so this set is only visible to the local thread.
2122 */
2123 cm_id_priv->id.state = IB_CM_REQ_RCVD;
2124
2125 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
2126 if (!listen_cm_id_priv) {
2127 pr_debug("%s: local_id %d, no listen_cm_id_priv\n", __func__,
2128 be32_to_cpu(cm_id_priv->id.local_id));
2129 cm_id_priv->id.state = IB_CM_IDLE;
2130 ret = -EINVAL;
2131 goto destroy;
2132 }
2133
2134 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
2135
2136 memset(&work->path[0], 0, sizeof(work->path[0]));
2137 if (cm_req_has_alt_path(req_msg))
2138 memset(&work->path[1], 0, sizeof(work->path[1]));
2139 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
2140 gid_attr = grh->sgid_attr;
2141
2142 if (gid_attr &&
2143 rdma_protocol_roce(work->port->cm_dev->ib_device,
2144 work->port->port_num)) {
2145 work->path[0].rec_type =
2146 sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
2147 } else {
2148 cm_path_set_rec_type(
2149 work->port->cm_dev->ib_device, work->port->port_num,
2150 &work->path[0],
2151 IBA_GET_MEM_PTR(CM_REQ_PRIMARY_LOCAL_PORT_GID,
2152 req_msg));
2153 }
2154 if (cm_req_has_alt_path(req_msg))
2155 work->path[1].rec_type = work->path[0].rec_type;
2156 cm_format_paths_from_req(req_msg, &work->path[0],
2157 &work->path[1]);
2158 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2159 sa_path_set_dmac(&work->path[0],
2160 cm_id_priv->av.ah_attr.roce.dmac);
2161 work->path[0].hop_limit = grh->hop_limit;
2162 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av,
2163 cm_id_priv);
2164 if (ret) {
2165 int err;
2166
2167 err = rdma_query_gid(work->port->cm_dev->ib_device,
2168 work->port->port_num, 0,
2169 &work->path[0].sgid);
2170 if (err)
2171 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2172 NULL, 0, NULL, 0);
2173 else
2174 ib_send_cm_rej(&cm_id_priv->id, IB_CM_REJ_INVALID_GID,
2175 &work->path[0].sgid,
2176 sizeof(work->path[0].sgid),
2177 NULL, 0);
2178 goto rejected;
2179 }
2180 if (cm_req_has_alt_path(req_msg)) {
2181 ret = cm_init_av_by_path(&work->path[1], NULL,
2182 &cm_id_priv->alt_av, cm_id_priv);
2183 if (ret) {
2184 ib_send_cm_rej(&cm_id_priv->id,
2185 IB_CM_REJ_INVALID_ALT_GID,
2186 &work->path[0].sgid,
2187 sizeof(work->path[0].sgid), NULL, 0);
2188 goto rejected;
2189 }
2190 }
2191
2192 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
2193 cm_id_priv->id.context = listen_cm_id_priv->id.context;
2194 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2195
2196 /* Now MAD handlers can see the new ID */
2197 spin_lock_irq(&cm_id_priv->lock);
2198 cm_finalize_id(cm_id_priv);
2199
2200 /* Refcount belongs to the event, pairs with cm_process_work() */
2201 refcount_inc(&cm_id_priv->refcount);
2202 cm_queue_work_unlock(cm_id_priv, work);
2203 /*
2204 * Since this ID was just created and was not made visible to other MAD
2205 * handlers until the cm_finalize_id() above we know that the
2206 * cm_process_work() will deliver the event and the listen_cm_id
2207 * embedded in the event can be derefed here.
2208 */
2209 cm_deref_id(listen_cm_id_priv);
2210 return 0;
2211
2212rejected:
2213 cm_deref_id(listen_cm_id_priv);
2214destroy:
2215 ib_destroy_cm_id(&cm_id_priv->id);
2216 return ret;
2217}
2218
2219static void cm_format_rep(struct cm_rep_msg *rep_msg,
2220 struct cm_id_private *cm_id_priv,
2221 struct ib_cm_rep_param *param)
2222{
2223 cm_format_mad_ece_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid,
2224 param->ece.attr_mod);
2225 IBA_SET(CM_REP_LOCAL_COMM_ID, rep_msg,
2226 be32_to_cpu(cm_id_priv->id.local_id));
2227 IBA_SET(CM_REP_REMOTE_COMM_ID, rep_msg,
2228 be32_to_cpu(cm_id_priv->id.remote_id));
2229 IBA_SET(CM_REP_STARTING_PSN, rep_msg, param->starting_psn);
2230 IBA_SET(CM_REP_RESPONDER_RESOURCES, rep_msg,
2231 param->responder_resources);
2232 IBA_SET(CM_REP_TARGET_ACK_DELAY, rep_msg,
2233 cm_id_priv->av.port->cm_dev->ack_delay);
2234 IBA_SET(CM_REP_FAILOVER_ACCEPTED, rep_msg, param->failover_accepted);
2235 IBA_SET(CM_REP_RNR_RETRY_COUNT, rep_msg, param->rnr_retry_count);
2236 IBA_SET(CM_REP_LOCAL_CA_GUID, rep_msg,
2237 be64_to_cpu(cm_id_priv->id.device->node_guid));
2238
2239 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2240 IBA_SET(CM_REP_INITIATOR_DEPTH, rep_msg,
2241 param->initiator_depth);
2242 IBA_SET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg,
2243 param->flow_control);
2244 IBA_SET(CM_REP_SRQ, rep_msg, param->srq);
2245 IBA_SET(CM_REP_LOCAL_QPN, rep_msg, param->qp_num);
2246 } else {
2247 IBA_SET(CM_REP_SRQ, rep_msg, 1);
2248 IBA_SET(CM_REP_LOCAL_EE_CONTEXT_NUMBER, rep_msg, param->qp_num);
2249 }
2250
2251 IBA_SET(CM_REP_VENDOR_ID_L, rep_msg, param->ece.vendor_id);
2252 IBA_SET(CM_REP_VENDOR_ID_M, rep_msg, param->ece.vendor_id >> 8);
2253 IBA_SET(CM_REP_VENDOR_ID_H, rep_msg, param->ece.vendor_id >> 16);
2254
2255 if (param->private_data && param->private_data_len)
2256 IBA_SET_MEM(CM_REP_PRIVATE_DATA, rep_msg, param->private_data,
2257 param->private_data_len);
2258}
2259
2260int ib_send_cm_rep(struct ib_cm_id *cm_id,
2261 struct ib_cm_rep_param *param)
2262{
2263 struct cm_id_private *cm_id_priv;
2264 struct ib_mad_send_buf *msg;
2265 struct cm_rep_msg *rep_msg;
2266 unsigned long flags;
2267 int ret;
2268
2269 if (param->private_data &&
2270 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2271 return -EINVAL;
2272
2273 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2274 spin_lock_irqsave(&cm_id_priv->lock, flags);
2275 if (cm_id->state != IB_CM_REQ_RCVD &&
2276 cm_id->state != IB_CM_MRA_REQ_SENT) {
2277 pr_debug("%s: local_comm_id %d, cm_id->state: %d\n", __func__,
2278 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2279 ret = -EINVAL;
2280 goto out;
2281 }
2282
2283 ret = cm_alloc_msg(cm_id_priv, &msg);
2284 if (ret)
2285 goto out;
2286
2287 rep_msg = (struct cm_rep_msg *) msg->mad;
2288 cm_format_rep(rep_msg, cm_id_priv, param);
2289 msg->timeout_ms = cm_id_priv->timeout_ms;
2290 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2291
2292 ret = ib_post_send_mad(msg, NULL);
2293 if (ret) {
2294 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2295 cm_free_msg(msg);
2296 return ret;
2297 }
2298
2299 cm_id->state = IB_CM_REP_SENT;
2300 cm_id_priv->msg = msg;
2301 cm_id_priv->initiator_depth = param->initiator_depth;
2302 cm_id_priv->responder_resources = param->responder_resources;
2303 cm_id_priv->rq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2304 WARN_ONCE(param->qp_num & 0xFF000000,
2305 "IBTA declares QPN to be 24 bits, but it is 0x%X\n",
2306 param->qp_num);
2307 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2308
2309out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2310 return ret;
2311}
2312EXPORT_SYMBOL(ib_send_cm_rep);
2313
2314static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2315 struct cm_id_private *cm_id_priv,
2316 const void *private_data,
2317 u8 private_data_len)
2318{
2319 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2320 IBA_SET(CM_RTU_LOCAL_COMM_ID, rtu_msg,
2321 be32_to_cpu(cm_id_priv->id.local_id));
2322 IBA_SET(CM_RTU_REMOTE_COMM_ID, rtu_msg,
2323 be32_to_cpu(cm_id_priv->id.remote_id));
2324
2325 if (private_data && private_data_len)
2326 IBA_SET_MEM(CM_RTU_PRIVATE_DATA, rtu_msg, private_data,
2327 private_data_len);
2328}
2329
2330int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2331 const void *private_data,
2332 u8 private_data_len)
2333{
2334 struct cm_id_private *cm_id_priv;
2335 struct ib_mad_send_buf *msg;
2336 unsigned long flags;
2337 void *data;
2338 int ret;
2339
2340 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2341 return -EINVAL;
2342
2343 data = cm_copy_private_data(private_data, private_data_len);
2344 if (IS_ERR(data))
2345 return PTR_ERR(data);
2346
2347 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2348 spin_lock_irqsave(&cm_id_priv->lock, flags);
2349 if (cm_id->state != IB_CM_REP_RCVD &&
2350 cm_id->state != IB_CM_MRA_REP_SENT) {
2351 pr_debug("%s: local_id %d, cm_id->state %d\n", __func__,
2352 be32_to_cpu(cm_id->local_id), cm_id->state);
2353 ret = -EINVAL;
2354 goto error;
2355 }
2356
2357 ret = cm_alloc_msg(cm_id_priv, &msg);
2358 if (ret)
2359 goto error;
2360
2361 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2362 private_data, private_data_len);
2363
2364 ret = ib_post_send_mad(msg, NULL);
2365 if (ret) {
2366 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2367 cm_free_msg(msg);
2368 kfree(data);
2369 return ret;
2370 }
2371
2372 cm_id->state = IB_CM_ESTABLISHED;
2373 cm_set_private_data(cm_id_priv, data, private_data_len);
2374 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2375 return 0;
2376
2377error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2378 kfree(data);
2379 return ret;
2380}
2381EXPORT_SYMBOL(ib_send_cm_rtu);
2382
2383static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2384{
2385 struct cm_rep_msg *rep_msg;
2386 struct ib_cm_rep_event_param *param;
2387
2388 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2389 param = &work->cm_event.param.rep_rcvd;
2390 param->remote_ca_guid =
2391 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2392 param->remote_qkey = IBA_GET(CM_REP_LOCAL_Q_KEY, rep_msg);
2393 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2394 param->starting_psn = IBA_GET(CM_REP_STARTING_PSN, rep_msg);
2395 param->responder_resources = IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2396 param->initiator_depth = IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2397 param->target_ack_delay = IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2398 param->failover_accepted = IBA_GET(CM_REP_FAILOVER_ACCEPTED, rep_msg);
2399 param->flow_control = IBA_GET(CM_REP_END_TO_END_FLOW_CONTROL, rep_msg);
2400 param->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2401 param->srq = IBA_GET(CM_REP_SRQ, rep_msg);
2402 param->ece.vendor_id = IBA_GET(CM_REP_VENDOR_ID_H, rep_msg) << 16;
2403 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_M, rep_msg) << 8;
2404 param->ece.vendor_id |= IBA_GET(CM_REP_VENDOR_ID_L, rep_msg);
2405 param->ece.attr_mod = be32_to_cpu(rep_msg->hdr.attr_mod);
2406
2407 work->cm_event.private_data =
2408 IBA_GET_MEM_PTR(CM_REP_PRIVATE_DATA, rep_msg);
2409}
2410
2411static void cm_dup_rep_handler(struct cm_work *work)
2412{
2413 struct cm_id_private *cm_id_priv;
2414 struct cm_rep_msg *rep_msg;
2415 struct ib_mad_send_buf *msg = NULL;
2416 int ret;
2417
2418 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2419 cm_id_priv = cm_acquire_id(
2420 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)),
2421 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg)));
2422 if (!cm_id_priv)
2423 return;
2424
2425 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2426 counter[CM_REP_COUNTER]);
2427 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2428 if (ret)
2429 goto deref;
2430
2431 spin_lock_irq(&cm_id_priv->lock);
2432 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2433 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2434 cm_id_priv->private_data,
2435 cm_id_priv->private_data_len);
2436 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2437 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2438 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2439 cm_id_priv->private_data,
2440 cm_id_priv->private_data_len);
2441 else
2442 goto unlock;
2443 spin_unlock_irq(&cm_id_priv->lock);
2444
2445 ret = ib_post_send_mad(msg, NULL);
2446 if (ret)
2447 goto free;
2448 goto deref;
2449
2450unlock: spin_unlock_irq(&cm_id_priv->lock);
2451free: cm_free_msg(msg);
2452deref: cm_deref_id(cm_id_priv);
2453}
2454
2455static int cm_rep_handler(struct cm_work *work)
2456{
2457 struct cm_id_private *cm_id_priv;
2458 struct cm_rep_msg *rep_msg;
2459 int ret;
2460 struct cm_id_private *cur_cm_id_priv;
2461 struct cm_timewait_info *timewait_info;
2462
2463 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2464 cm_id_priv = cm_acquire_id(
2465 cpu_to_be32(IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg)), 0);
2466 if (!cm_id_priv) {
2467 cm_dup_rep_handler(work);
2468 pr_debug("%s: remote_comm_id %d, no cm_id_priv\n", __func__,
2469 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2470 return -EINVAL;
2471 }
2472
2473 cm_format_rep_event(work, cm_id_priv->qp_type);
2474
2475 spin_lock_irq(&cm_id_priv->lock);
2476 switch (cm_id_priv->id.state) {
2477 case IB_CM_REQ_SENT:
2478 case IB_CM_MRA_REQ_RCVD:
2479 break;
2480 default:
2481 ret = -EINVAL;
2482 pr_debug(
2483 "%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n",
2484 __func__, cm_id_priv->id.state,
2485 IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2486 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2487 spin_unlock_irq(&cm_id_priv->lock);
2488 goto error;
2489 }
2490
2491 cm_id_priv->timewait_info->work.remote_id =
2492 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2493 cm_id_priv->timewait_info->remote_ca_guid =
2494 cpu_to_be64(IBA_GET(CM_REP_LOCAL_CA_GUID, rep_msg));
2495 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2496
2497 spin_lock(&cm.lock);
2498 /* Check for duplicate REP. */
2499 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2500 spin_unlock(&cm.lock);
2501 spin_unlock_irq(&cm_id_priv->lock);
2502 ret = -EINVAL;
2503 pr_debug("%s: Failed to insert remote id %d\n", __func__,
2504 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2505 goto error;
2506 }
2507 /* Check for a stale connection. */
2508 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2509 if (timewait_info) {
2510 cm_remove_remote(cm_id_priv);
2511 cur_cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2512 timewait_info->work.remote_id);
2513
2514 spin_unlock(&cm.lock);
2515 spin_unlock_irq(&cm_id_priv->lock);
2516 cm_issue_rej(work->port, work->mad_recv_wc,
2517 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2518 NULL, 0);
2519 ret = -EINVAL;
2520 pr_debug(
2521 "%s: Stale connection. local_comm_id %d, remote_comm_id %d\n",
2522 __func__, IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg),
2523 IBA_GET(CM_REP_REMOTE_COMM_ID, rep_msg));
2524
2525 if (cur_cm_id_priv) {
2526 ib_send_cm_dreq(&cur_cm_id_priv->id, NULL, 0);
2527 cm_deref_id(cur_cm_id_priv);
2528 }
2529
2530 goto error;
2531 }
2532 spin_unlock(&cm.lock);
2533
2534 cm_id_priv->id.state = IB_CM_REP_RCVD;
2535 cm_id_priv->id.remote_id =
2536 cpu_to_be32(IBA_GET(CM_REP_LOCAL_COMM_ID, rep_msg));
2537 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2538 cm_id_priv->initiator_depth =
2539 IBA_GET(CM_REP_RESPONDER_RESOURCES, rep_msg);
2540 cm_id_priv->responder_resources =
2541 IBA_GET(CM_REP_INITIATOR_DEPTH, rep_msg);
2542 cm_id_priv->sq_psn = cpu_to_be32(IBA_GET(CM_REP_STARTING_PSN, rep_msg));
2543 cm_id_priv->rnr_retry_count = IBA_GET(CM_REP_RNR_RETRY_COUNT, rep_msg);
2544 cm_id_priv->target_ack_delay =
2545 IBA_GET(CM_REP_TARGET_ACK_DELAY, rep_msg);
2546 cm_id_priv->av.timeout =
2547 cm_ack_timeout(cm_id_priv->target_ack_delay,
2548 cm_id_priv->av.timeout - 1);
2549 cm_id_priv->alt_av.timeout =
2550 cm_ack_timeout(cm_id_priv->target_ack_delay,
2551 cm_id_priv->alt_av.timeout - 1);
2552
2553 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2554 cm_queue_work_unlock(cm_id_priv, work);
2555 return 0;
2556
2557error:
2558 cm_deref_id(cm_id_priv);
2559 return ret;
2560}
2561
2562static int cm_establish_handler(struct cm_work *work)
2563{
2564 struct cm_id_private *cm_id_priv;
2565
2566 /* See comment in cm_establish about lookup. */
2567 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2568 if (!cm_id_priv)
2569 return -EINVAL;
2570
2571 spin_lock_irq(&cm_id_priv->lock);
2572 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2573 spin_unlock_irq(&cm_id_priv->lock);
2574 goto out;
2575 }
2576
2577 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2578 cm_queue_work_unlock(cm_id_priv, work);
2579 return 0;
2580out:
2581 cm_deref_id(cm_id_priv);
2582 return -EINVAL;
2583}
2584
2585static int cm_rtu_handler(struct cm_work *work)
2586{
2587 struct cm_id_private *cm_id_priv;
2588 struct cm_rtu_msg *rtu_msg;
2589
2590 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2591 cm_id_priv = cm_acquire_id(
2592 cpu_to_be32(IBA_GET(CM_RTU_REMOTE_COMM_ID, rtu_msg)),
2593 cpu_to_be32(IBA_GET(CM_RTU_LOCAL_COMM_ID, rtu_msg)));
2594 if (!cm_id_priv)
2595 return -EINVAL;
2596
2597 work->cm_event.private_data =
2598 IBA_GET_MEM_PTR(CM_RTU_PRIVATE_DATA, rtu_msg);
2599
2600 spin_lock_irq(&cm_id_priv->lock);
2601 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2602 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2603 spin_unlock_irq(&cm_id_priv->lock);
2604 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2605 counter[CM_RTU_COUNTER]);
2606 goto out;
2607 }
2608 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2609
2610 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2611 cm_queue_work_unlock(cm_id_priv, work);
2612 return 0;
2613out:
2614 cm_deref_id(cm_id_priv);
2615 return -EINVAL;
2616}
2617
2618static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2619 struct cm_id_private *cm_id_priv,
2620 const void *private_data,
2621 u8 private_data_len)
2622{
2623 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2624 cm_form_tid(cm_id_priv));
2625 IBA_SET(CM_DREQ_LOCAL_COMM_ID, dreq_msg,
2626 be32_to_cpu(cm_id_priv->id.local_id));
2627 IBA_SET(CM_DREQ_REMOTE_COMM_ID, dreq_msg,
2628 be32_to_cpu(cm_id_priv->id.remote_id));
2629 IBA_SET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg,
2630 be32_to_cpu(cm_id_priv->remote_qpn));
2631
2632 if (private_data && private_data_len)
2633 IBA_SET_MEM(CM_DREQ_PRIVATE_DATA, dreq_msg, private_data,
2634 private_data_len);
2635}
2636
2637static int cm_send_dreq_locked(struct cm_id_private *cm_id_priv,
2638 const void *private_data, u8 private_data_len)
2639{
2640 struct ib_mad_send_buf *msg;
2641 int ret;
2642
2643 lockdep_assert_held(&cm_id_priv->lock);
2644
2645 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2646 return -EINVAL;
2647
2648 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2649 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2650 be32_to_cpu(cm_id_priv->id.local_id),
2651 cm_id_priv->id.state);
2652 return -EINVAL;
2653 }
2654
2655 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2656 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2657 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2658
2659 ret = cm_alloc_msg(cm_id_priv, &msg);
2660 if (ret) {
2661 cm_enter_timewait(cm_id_priv);
2662 return ret;
2663 }
2664
2665 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2666 private_data, private_data_len);
2667 msg->timeout_ms = cm_id_priv->timeout_ms;
2668 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2669
2670 ret = ib_post_send_mad(msg, NULL);
2671 if (ret) {
2672 cm_enter_timewait(cm_id_priv);
2673 cm_free_msg(msg);
2674 return ret;
2675 }
2676
2677 cm_id_priv->id.state = IB_CM_DREQ_SENT;
2678 cm_id_priv->msg = msg;
2679 return 0;
2680}
2681
2682int ib_send_cm_dreq(struct ib_cm_id *cm_id, const void *private_data,
2683 u8 private_data_len)
2684{
2685 struct cm_id_private *cm_id_priv =
2686 container_of(cm_id, struct cm_id_private, id);
2687 unsigned long flags;
2688 int ret;
2689
2690 spin_lock_irqsave(&cm_id_priv->lock, flags);
2691 ret = cm_send_dreq_locked(cm_id_priv, private_data, private_data_len);
2692 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2693 return ret;
2694}
2695EXPORT_SYMBOL(ib_send_cm_dreq);
2696
2697static void cm_format_drep(struct cm_drep_msg *drep_msg,
2698 struct cm_id_private *cm_id_priv,
2699 const void *private_data,
2700 u8 private_data_len)
2701{
2702 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2703 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2704 be32_to_cpu(cm_id_priv->id.local_id));
2705 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2706 be32_to_cpu(cm_id_priv->id.remote_id));
2707
2708 if (private_data && private_data_len)
2709 IBA_SET_MEM(CM_DREP_PRIVATE_DATA, drep_msg, private_data,
2710 private_data_len);
2711}
2712
2713static int cm_send_drep_locked(struct cm_id_private *cm_id_priv,
2714 void *private_data, u8 private_data_len)
2715{
2716 struct ib_mad_send_buf *msg;
2717 int ret;
2718
2719 lockdep_assert_held(&cm_id_priv->lock);
2720
2721 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2722 return -EINVAL;
2723
2724 if (cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2725 pr_debug(
2726 "%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n",
2727 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2728 cm_id_priv->id.state);
2729 kfree(private_data);
2730 return -EINVAL;
2731 }
2732
2733 cm_set_private_data(cm_id_priv, private_data, private_data_len);
2734 cm_enter_timewait(cm_id_priv);
2735
2736 ret = cm_alloc_msg(cm_id_priv, &msg);
2737 if (ret)
2738 return ret;
2739
2740 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2741 private_data, private_data_len);
2742
2743 ret = ib_post_send_mad(msg, NULL);
2744 if (ret) {
2745 cm_free_msg(msg);
2746 return ret;
2747 }
2748 return 0;
2749}
2750
2751int ib_send_cm_drep(struct ib_cm_id *cm_id, const void *private_data,
2752 u8 private_data_len)
2753{
2754 struct cm_id_private *cm_id_priv =
2755 container_of(cm_id, struct cm_id_private, id);
2756 unsigned long flags;
2757 void *data;
2758 int ret;
2759
2760 data = cm_copy_private_data(private_data, private_data_len);
2761 if (IS_ERR(data))
2762 return PTR_ERR(data);
2763
2764 spin_lock_irqsave(&cm_id_priv->lock, flags);
2765 ret = cm_send_drep_locked(cm_id_priv, data, private_data_len);
2766 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2767 return ret;
2768}
2769EXPORT_SYMBOL(ib_send_cm_drep);
2770
2771static int cm_issue_drep(struct cm_port *port,
2772 struct ib_mad_recv_wc *mad_recv_wc)
2773{
2774 struct ib_mad_send_buf *msg = NULL;
2775 struct cm_dreq_msg *dreq_msg;
2776 struct cm_drep_msg *drep_msg;
2777 int ret;
2778
2779 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2780 if (ret)
2781 return ret;
2782
2783 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2784 drep_msg = (struct cm_drep_msg *) msg->mad;
2785
2786 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2787 IBA_SET(CM_DREP_REMOTE_COMM_ID, drep_msg,
2788 IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg));
2789 IBA_SET(CM_DREP_LOCAL_COMM_ID, drep_msg,
2790 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2791
2792 ret = ib_post_send_mad(msg, NULL);
2793 if (ret)
2794 cm_free_msg(msg);
2795
2796 return ret;
2797}
2798
2799static int cm_dreq_handler(struct cm_work *work)
2800{
2801 struct cm_id_private *cm_id_priv;
2802 struct cm_dreq_msg *dreq_msg;
2803 struct ib_mad_send_buf *msg = NULL;
2804
2805 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2806 cm_id_priv = cm_acquire_id(
2807 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg)),
2808 cpu_to_be32(IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg)));
2809 if (!cm_id_priv) {
2810 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2811 counter[CM_DREQ_COUNTER]);
2812 cm_issue_drep(work->port, work->mad_recv_wc);
2813 pr_debug(
2814 "%s: no cm_id_priv, local_comm_id %d, remote_comm_id %d\n",
2815 __func__, IBA_GET(CM_DREQ_LOCAL_COMM_ID, dreq_msg),
2816 IBA_GET(CM_DREQ_REMOTE_COMM_ID, dreq_msg));
2817 return -EINVAL;
2818 }
2819
2820 work->cm_event.private_data =
2821 IBA_GET_MEM_PTR(CM_DREQ_PRIVATE_DATA, dreq_msg);
2822
2823 spin_lock_irq(&cm_id_priv->lock);
2824 if (cm_id_priv->local_qpn !=
2825 cpu_to_be32(IBA_GET(CM_DREQ_REMOTE_QPN_EECN, dreq_msg)))
2826 goto unlock;
2827
2828 switch (cm_id_priv->id.state) {
2829 case IB_CM_REP_SENT:
2830 case IB_CM_DREQ_SENT:
2831 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2832 break;
2833 case IB_CM_ESTABLISHED:
2834 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2835 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2836 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2837 break;
2838 case IB_CM_MRA_REP_RCVD:
2839 break;
2840 case IB_CM_TIMEWAIT:
2841 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2842 counter[CM_DREQ_COUNTER]);
2843 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2844 if (IS_ERR(msg))
2845 goto unlock;
2846
2847 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2848 cm_id_priv->private_data,
2849 cm_id_priv->private_data_len);
2850 spin_unlock_irq(&cm_id_priv->lock);
2851
2852 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2853 ib_post_send_mad(msg, NULL))
2854 cm_free_msg(msg);
2855 goto deref;
2856 case IB_CM_DREQ_RCVD:
2857 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2858 counter[CM_DREQ_COUNTER]);
2859 goto unlock;
2860 default:
2861 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2862 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2863 cm_id_priv->id.state);
2864 goto unlock;
2865 }
2866 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2867 cm_id_priv->tid = dreq_msg->hdr.tid;
2868 cm_queue_work_unlock(cm_id_priv, work);
2869 return 0;
2870
2871unlock: spin_unlock_irq(&cm_id_priv->lock);
2872deref: cm_deref_id(cm_id_priv);
2873 return -EINVAL;
2874}
2875
2876static int cm_drep_handler(struct cm_work *work)
2877{
2878 struct cm_id_private *cm_id_priv;
2879 struct cm_drep_msg *drep_msg;
2880
2881 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2882 cm_id_priv = cm_acquire_id(
2883 cpu_to_be32(IBA_GET(CM_DREP_REMOTE_COMM_ID, drep_msg)),
2884 cpu_to_be32(IBA_GET(CM_DREP_LOCAL_COMM_ID, drep_msg)));
2885 if (!cm_id_priv)
2886 return -EINVAL;
2887
2888 work->cm_event.private_data =
2889 IBA_GET_MEM_PTR(CM_DREP_PRIVATE_DATA, drep_msg);
2890
2891 spin_lock_irq(&cm_id_priv->lock);
2892 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2893 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2894 spin_unlock_irq(&cm_id_priv->lock);
2895 goto out;
2896 }
2897 cm_enter_timewait(cm_id_priv);
2898
2899 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2900 cm_queue_work_unlock(cm_id_priv, work);
2901 return 0;
2902out:
2903 cm_deref_id(cm_id_priv);
2904 return -EINVAL;
2905}
2906
2907static int cm_send_rej_locked(struct cm_id_private *cm_id_priv,
2908 enum ib_cm_rej_reason reason, void *ari,
2909 u8 ari_length, const void *private_data,
2910 u8 private_data_len)
2911{
2912 enum ib_cm_state state = cm_id_priv->id.state;
2913 struct ib_mad_send_buf *msg;
2914 int ret;
2915
2916 lockdep_assert_held(&cm_id_priv->lock);
2917
2918 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2919 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2920 return -EINVAL;
2921
2922 switch (state) {
2923 case IB_CM_REQ_SENT:
2924 case IB_CM_MRA_REQ_RCVD:
2925 case IB_CM_REQ_RCVD:
2926 case IB_CM_MRA_REQ_SENT:
2927 case IB_CM_REP_RCVD:
2928 case IB_CM_MRA_REP_SENT:
2929 cm_reset_to_idle(cm_id_priv);
2930 ret = cm_alloc_msg(cm_id_priv, &msg);
2931 if (ret)
2932 return ret;
2933 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2934 ari, ari_length, private_data, private_data_len,
2935 state);
2936 break;
2937 case IB_CM_REP_SENT:
2938 case IB_CM_MRA_REP_RCVD:
2939 cm_enter_timewait(cm_id_priv);
2940 ret = cm_alloc_msg(cm_id_priv, &msg);
2941 if (ret)
2942 return ret;
2943 cm_format_rej((struct cm_rej_msg *)msg->mad, cm_id_priv, reason,
2944 ari, ari_length, private_data, private_data_len,
2945 state);
2946 break;
2947 default:
2948 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2949 be32_to_cpu(cm_id_priv->id.local_id),
2950 cm_id_priv->id.state);
2951 return -EINVAL;
2952 }
2953
2954 ret = ib_post_send_mad(msg, NULL);
2955 if (ret) {
2956 cm_free_msg(msg);
2957 return ret;
2958 }
2959
2960 return 0;
2961}
2962
2963int ib_send_cm_rej(struct ib_cm_id *cm_id, enum ib_cm_rej_reason reason,
2964 void *ari, u8 ari_length, const void *private_data,
2965 u8 private_data_len)
2966{
2967 struct cm_id_private *cm_id_priv =
2968 container_of(cm_id, struct cm_id_private, id);
2969 unsigned long flags;
2970 int ret;
2971
2972 spin_lock_irqsave(&cm_id_priv->lock, flags);
2973 ret = cm_send_rej_locked(cm_id_priv, reason, ari, ari_length,
2974 private_data, private_data_len);
2975 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2976 return ret;
2977}
2978EXPORT_SYMBOL(ib_send_cm_rej);
2979
2980static void cm_format_rej_event(struct cm_work *work)
2981{
2982 struct cm_rej_msg *rej_msg;
2983 struct ib_cm_rej_event_param *param;
2984
2985 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2986 param = &work->cm_event.param.rej_rcvd;
2987 param->ari = IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg);
2988 param->ari_length = IBA_GET(CM_REJ_REJECTED_INFO_LENGTH, rej_msg);
2989 param->reason = IBA_GET(CM_REJ_REASON, rej_msg);
2990 work->cm_event.private_data =
2991 IBA_GET_MEM_PTR(CM_REJ_PRIVATE_DATA, rej_msg);
2992}
2993
2994static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2995{
2996 struct cm_id_private *cm_id_priv;
2997 __be32 remote_id;
2998
2999 remote_id = cpu_to_be32(IBA_GET(CM_REJ_LOCAL_COMM_ID, rej_msg));
3000
3001 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_TIMEOUT) {
3002 cm_id_priv = cm_find_remote_id(
3003 *((__be64 *)IBA_GET_MEM_PTR(CM_REJ_ARI, rej_msg)),
3004 remote_id);
3005 } else if (IBA_GET(CM_REJ_MESSAGE_REJECTED, rej_msg) ==
3006 CM_MSG_RESPONSE_REQ)
3007 cm_id_priv = cm_acquire_id(
3008 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3009 0);
3010 else
3011 cm_id_priv = cm_acquire_id(
3012 cpu_to_be32(IBA_GET(CM_REJ_REMOTE_COMM_ID, rej_msg)),
3013 remote_id);
3014
3015 return cm_id_priv;
3016}
3017
3018static int cm_rej_handler(struct cm_work *work)
3019{
3020 struct cm_id_private *cm_id_priv;
3021 struct cm_rej_msg *rej_msg;
3022
3023 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
3024 cm_id_priv = cm_acquire_rejected_id(rej_msg);
3025 if (!cm_id_priv)
3026 return -EINVAL;
3027
3028 cm_format_rej_event(work);
3029
3030 spin_lock_irq(&cm_id_priv->lock);
3031 switch (cm_id_priv->id.state) {
3032 case IB_CM_REQ_SENT:
3033 case IB_CM_MRA_REQ_RCVD:
3034 case IB_CM_REP_SENT:
3035 case IB_CM_MRA_REP_RCVD:
3036 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3037 fallthrough;
3038 case IB_CM_REQ_RCVD:
3039 case IB_CM_MRA_REQ_SENT:
3040 if (IBA_GET(CM_REJ_REASON, rej_msg) == IB_CM_REJ_STALE_CONN)
3041 cm_enter_timewait(cm_id_priv);
3042 else
3043 cm_reset_to_idle(cm_id_priv);
3044 break;
3045 case IB_CM_DREQ_SENT:
3046 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3047 fallthrough;
3048 case IB_CM_REP_RCVD:
3049 case IB_CM_MRA_REP_SENT:
3050 cm_enter_timewait(cm_id_priv);
3051 break;
3052 case IB_CM_ESTABLISHED:
3053 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
3054 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
3055 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
3056 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
3057 cm_id_priv->msg);
3058 cm_enter_timewait(cm_id_priv);
3059 break;
3060 }
3061 fallthrough;
3062 default:
3063 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
3064 __func__, be32_to_cpu(cm_id_priv->id.local_id),
3065 cm_id_priv->id.state);
3066 spin_unlock_irq(&cm_id_priv->lock);
3067 goto out;
3068 }
3069
3070 cm_queue_work_unlock(cm_id_priv, work);
3071 return 0;
3072out:
3073 cm_deref_id(cm_id_priv);
3074 return -EINVAL;
3075}
3076
3077int ib_send_cm_mra(struct ib_cm_id *cm_id,
3078 u8 service_timeout,
3079 const void *private_data,
3080 u8 private_data_len)
3081{
3082 struct cm_id_private *cm_id_priv;
3083 struct ib_mad_send_buf *msg;
3084 enum ib_cm_state cm_state;
3085 enum ib_cm_lap_state lap_state;
3086 enum cm_msg_response msg_response;
3087 void *data;
3088 unsigned long flags;
3089 int ret;
3090
3091 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
3092 return -EINVAL;
3093
3094 data = cm_copy_private_data(private_data, private_data_len);
3095 if (IS_ERR(data))
3096 return PTR_ERR(data);
3097
3098 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3099
3100 spin_lock_irqsave(&cm_id_priv->lock, flags);
3101 switch(cm_id_priv->id.state) {
3102 case IB_CM_REQ_RCVD:
3103 cm_state = IB_CM_MRA_REQ_SENT;
3104 lap_state = cm_id->lap_state;
3105 msg_response = CM_MSG_RESPONSE_REQ;
3106 break;
3107 case IB_CM_REP_RCVD:
3108 cm_state = IB_CM_MRA_REP_SENT;
3109 lap_state = cm_id->lap_state;
3110 msg_response = CM_MSG_RESPONSE_REP;
3111 break;
3112 case IB_CM_ESTABLISHED:
3113 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
3114 cm_state = cm_id->state;
3115 lap_state = IB_CM_MRA_LAP_SENT;
3116 msg_response = CM_MSG_RESPONSE_OTHER;
3117 break;
3118 }
3119 fallthrough;
3120 default:
3121 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
3122 __func__, be32_to_cpu(cm_id_priv->id.local_id),
3123 cm_id_priv->id.state);
3124 ret = -EINVAL;
3125 goto error1;
3126 }
3127
3128 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
3129 ret = cm_alloc_msg(cm_id_priv, &msg);
3130 if (ret)
3131 goto error1;
3132
3133 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3134 msg_response, service_timeout,
3135 private_data, private_data_len);
3136 ret = ib_post_send_mad(msg, NULL);
3137 if (ret)
3138 goto error2;
3139 }
3140
3141 cm_id->state = cm_state;
3142 cm_id->lap_state = lap_state;
3143 cm_id_priv->service_timeout = service_timeout;
3144 cm_set_private_data(cm_id_priv, data, private_data_len);
3145 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3146 return 0;
3147
3148error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3149 kfree(data);
3150 return ret;
3151
3152error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3153 kfree(data);
3154 cm_free_msg(msg);
3155 return ret;
3156}
3157EXPORT_SYMBOL(ib_send_cm_mra);
3158
3159static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
3160{
3161 switch (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg)) {
3162 case CM_MSG_RESPONSE_REQ:
3163 return cm_acquire_id(
3164 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3165 0);
3166 case CM_MSG_RESPONSE_REP:
3167 case CM_MSG_RESPONSE_OTHER:
3168 return cm_acquire_id(
3169 cpu_to_be32(IBA_GET(CM_MRA_REMOTE_COMM_ID, mra_msg)),
3170 cpu_to_be32(IBA_GET(CM_MRA_LOCAL_COMM_ID, mra_msg)));
3171 default:
3172 return NULL;
3173 }
3174}
3175
3176static int cm_mra_handler(struct cm_work *work)
3177{
3178 struct cm_id_private *cm_id_priv;
3179 struct cm_mra_msg *mra_msg;
3180 int timeout;
3181
3182 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3183 cm_id_priv = cm_acquire_mraed_id(mra_msg);
3184 if (!cm_id_priv)
3185 return -EINVAL;
3186
3187 work->cm_event.private_data =
3188 IBA_GET_MEM_PTR(CM_MRA_PRIVATE_DATA, mra_msg);
3189 work->cm_event.param.mra_rcvd.service_timeout =
3190 IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg);
3191 timeout = cm_convert_to_ms(IBA_GET(CM_MRA_SERVICE_TIMEOUT, mra_msg)) +
3192 cm_convert_to_ms(cm_id_priv->av.timeout);
3193
3194 spin_lock_irq(&cm_id_priv->lock);
3195 switch (cm_id_priv->id.state) {
3196 case IB_CM_REQ_SENT:
3197 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3198 CM_MSG_RESPONSE_REQ ||
3199 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3200 cm_id_priv->msg, timeout))
3201 goto out;
3202 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3203 break;
3204 case IB_CM_REP_SENT:
3205 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3206 CM_MSG_RESPONSE_REP ||
3207 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3208 cm_id_priv->msg, timeout))
3209 goto out;
3210 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3211 break;
3212 case IB_CM_ESTABLISHED:
3213 if (IBA_GET(CM_MRA_MESSAGE_MRAED, mra_msg) !=
3214 CM_MSG_RESPONSE_OTHER ||
3215 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3216 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3217 cm_id_priv->msg, timeout)) {
3218 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3219 atomic_long_inc(&work->port->
3220 counter_group[CM_RECV_DUPLICATES].
3221 counter[CM_MRA_COUNTER]);
3222 goto out;
3223 }
3224 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3225 break;
3226 case IB_CM_MRA_REQ_RCVD:
3227 case IB_CM_MRA_REP_RCVD:
3228 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3229 counter[CM_MRA_COUNTER]);
3230 fallthrough;
3231 default:
3232 pr_debug("%s local_id %d, cm_id_priv->id.state: %d\n",
3233 __func__, be32_to_cpu(cm_id_priv->id.local_id),
3234 cm_id_priv->id.state);
3235 goto out;
3236 }
3237
3238 cm_id_priv->msg->context[1] = (void *) (unsigned long)
3239 cm_id_priv->id.state;
3240 cm_queue_work_unlock(cm_id_priv, work);
3241 return 0;
3242out:
3243 spin_unlock_irq(&cm_id_priv->lock);
3244 cm_deref_id(cm_id_priv);
3245 return -EINVAL;
3246}
3247
3248static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3249 struct sa_path_rec *path)
3250{
3251 u32 lid;
3252
3253 if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3254 sa_path_set_dlid(path, IBA_GET(CM_LAP_ALTERNATE_LOCAL_PORT_LID,
3255 lap_msg));
3256 sa_path_set_slid(path, IBA_GET(CM_LAP_ALTERNATE_REMOTE_PORT_LID,
3257 lap_msg));
3258 } else {
3259 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3260 CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg));
3261 sa_path_set_dlid(path, lid);
3262
3263 lid = opa_get_lid_from_gid(IBA_GET_MEM_PTR(
3264 CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg));
3265 sa_path_set_slid(path, lid);
3266 }
3267}
3268
3269static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3270 struct sa_path_rec *path,
3271 struct cm_lap_msg *lap_msg)
3272{
3273 path->dgid = *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID, lap_msg);
3274 path->sgid =
3275 *IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_REMOTE_PORT_GID, lap_msg);
3276 path->flow_label =
3277 cpu_to_be32(IBA_GET(CM_LAP_ALTERNATE_FLOW_LABEL, lap_msg));
3278 path->hop_limit = IBA_GET(CM_LAP_ALTERNATE_HOP_LIMIT, lap_msg);
3279 path->traffic_class = IBA_GET(CM_LAP_ALTERNATE_TRAFFIC_CLASS, lap_msg);
3280 path->reversible = 1;
3281 path->pkey = cm_id_priv->pkey;
3282 path->sl = IBA_GET(CM_LAP_ALTERNATE_SL, lap_msg);
3283 path->mtu_selector = IB_SA_EQ;
3284 path->mtu = cm_id_priv->path_mtu;
3285 path->rate_selector = IB_SA_EQ;
3286 path->rate = IBA_GET(CM_LAP_ALTERNATE_PACKET_RATE, lap_msg);
3287 path->packet_life_time_selector = IB_SA_EQ;
3288 path->packet_life_time =
3289 IBA_GET(CM_LAP_ALTERNATE_LOCAL_ACK_TIMEOUT, lap_msg);
3290 path->packet_life_time -= (path->packet_life_time > 0);
3291 cm_format_path_lid_from_lap(lap_msg, path);
3292}
3293
3294static int cm_lap_handler(struct cm_work *work)
3295{
3296 struct cm_id_private *cm_id_priv;
3297 struct cm_lap_msg *lap_msg;
3298 struct ib_cm_lap_event_param *param;
3299 struct ib_mad_send_buf *msg = NULL;
3300 int ret;
3301
3302 /* Currently Alternate path messages are not supported for
3303 * RoCE link layer.
3304 */
3305 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3306 work->port->port_num))
3307 return -EINVAL;
3308
3309 /* todo: verify LAP request and send reject APR if invalid. */
3310 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3311 cm_id_priv = cm_acquire_id(
3312 cpu_to_be32(IBA_GET(CM_LAP_REMOTE_COMM_ID, lap_msg)),
3313 cpu_to_be32(IBA_GET(CM_LAP_LOCAL_COMM_ID, lap_msg)));
3314 if (!cm_id_priv)
3315 return -EINVAL;
3316
3317 param = &work->cm_event.param.lap_rcvd;
3318 memset(&work->path[0], 0, sizeof(work->path[1]));
3319 cm_path_set_rec_type(work->port->cm_dev->ib_device,
3320 work->port->port_num, &work->path[0],
3321 IBA_GET_MEM_PTR(CM_LAP_ALTERNATE_LOCAL_PORT_GID,
3322 lap_msg));
3323 param->alternate_path = &work->path[0];
3324 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3325 work->cm_event.private_data =
3326 IBA_GET_MEM_PTR(CM_LAP_PRIVATE_DATA, lap_msg);
3327
3328 spin_lock_irq(&cm_id_priv->lock);
3329 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3330 goto unlock;
3331
3332 switch (cm_id_priv->id.lap_state) {
3333 case IB_CM_LAP_UNINIT:
3334 case IB_CM_LAP_IDLE:
3335 break;
3336 case IB_CM_MRA_LAP_SENT:
3337 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3338 counter[CM_LAP_COUNTER]);
3339 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3340 if (IS_ERR(msg))
3341 goto unlock;
3342
3343 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3344 CM_MSG_RESPONSE_OTHER,
3345 cm_id_priv->service_timeout,
3346 cm_id_priv->private_data,
3347 cm_id_priv->private_data_len);
3348 spin_unlock_irq(&cm_id_priv->lock);
3349
3350 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3351 ib_post_send_mad(msg, NULL))
3352 cm_free_msg(msg);
3353 goto deref;
3354 case IB_CM_LAP_RCVD:
3355 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3356 counter[CM_LAP_COUNTER]);
3357 goto unlock;
3358 default:
3359 goto unlock;
3360 }
3361
3362 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3363 work->mad_recv_wc->recv_buf.grh,
3364 &cm_id_priv->av);
3365 if (ret)
3366 goto unlock;
3367
3368 ret = cm_init_av_by_path(param->alternate_path, NULL,
3369 &cm_id_priv->alt_av, cm_id_priv);
3370 if (ret)
3371 goto unlock;
3372
3373 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3374 cm_id_priv->tid = lap_msg->hdr.tid;
3375 cm_queue_work_unlock(cm_id_priv, work);
3376 return 0;
3377
3378unlock: spin_unlock_irq(&cm_id_priv->lock);
3379deref: cm_deref_id(cm_id_priv);
3380 return -EINVAL;
3381}
3382
3383static int cm_apr_handler(struct cm_work *work)
3384{
3385 struct cm_id_private *cm_id_priv;
3386 struct cm_apr_msg *apr_msg;
3387
3388 /* Currently Alternate path messages are not supported for
3389 * RoCE link layer.
3390 */
3391 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3392 work->port->port_num))
3393 return -EINVAL;
3394
3395 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3396 cm_id_priv = cm_acquire_id(
3397 cpu_to_be32(IBA_GET(CM_APR_REMOTE_COMM_ID, apr_msg)),
3398 cpu_to_be32(IBA_GET(CM_APR_LOCAL_COMM_ID, apr_msg)));
3399 if (!cm_id_priv)
3400 return -EINVAL; /* Unmatched reply. */
3401
3402 work->cm_event.param.apr_rcvd.ap_status =
3403 IBA_GET(CM_APR_AR_STATUS, apr_msg);
3404 work->cm_event.param.apr_rcvd.apr_info =
3405 IBA_GET_MEM_PTR(CM_APR_ADDITIONAL_INFORMATION, apr_msg);
3406 work->cm_event.param.apr_rcvd.info_len =
3407 IBA_GET(CM_APR_ADDITIONAL_INFORMATION_LENGTH, apr_msg);
3408 work->cm_event.private_data =
3409 IBA_GET_MEM_PTR(CM_APR_PRIVATE_DATA, apr_msg);
3410
3411 spin_lock_irq(&cm_id_priv->lock);
3412 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3413 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3414 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3415 spin_unlock_irq(&cm_id_priv->lock);
3416 goto out;
3417 }
3418 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3419 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3420 cm_id_priv->msg = NULL;
3421 cm_queue_work_unlock(cm_id_priv, work);
3422 return 0;
3423out:
3424 cm_deref_id(cm_id_priv);
3425 return -EINVAL;
3426}
3427
3428static int cm_timewait_handler(struct cm_work *work)
3429{
3430 struct cm_timewait_info *timewait_info;
3431 struct cm_id_private *cm_id_priv;
3432
3433 timewait_info = container_of(work, struct cm_timewait_info, work);
3434 spin_lock_irq(&cm.lock);
3435 list_del(&timewait_info->list);
3436 spin_unlock_irq(&cm.lock);
3437
3438 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3439 timewait_info->work.remote_id);
3440 if (!cm_id_priv)
3441 return -EINVAL;
3442
3443 spin_lock_irq(&cm_id_priv->lock);
3444 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3445 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3446 spin_unlock_irq(&cm_id_priv->lock);
3447 goto out;
3448 }
3449 cm_id_priv->id.state = IB_CM_IDLE;
3450 cm_queue_work_unlock(cm_id_priv, work);
3451 return 0;
3452out:
3453 cm_deref_id(cm_id_priv);
3454 return -EINVAL;
3455}
3456
3457static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3458 struct cm_id_private *cm_id_priv,
3459 struct ib_cm_sidr_req_param *param)
3460{
3461 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3462 cm_form_tid(cm_id_priv));
3463 IBA_SET(CM_SIDR_REQ_REQUESTID, sidr_req_msg,
3464 be32_to_cpu(cm_id_priv->id.local_id));
3465 IBA_SET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg,
3466 be16_to_cpu(param->path->pkey));
3467 IBA_SET(CM_SIDR_REQ_SERVICEID, sidr_req_msg,
3468 be64_to_cpu(param->service_id));
3469
3470 if (param->private_data && param->private_data_len)
3471 IBA_SET_MEM(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg,
3472 param->private_data, param->private_data_len);
3473}
3474
3475int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3476 struct ib_cm_sidr_req_param *param)
3477{
3478 struct cm_id_private *cm_id_priv;
3479 struct ib_mad_send_buf *msg;
3480 unsigned long flags;
3481 int ret;
3482
3483 if (!param->path || (param->private_data &&
3484 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3485 return -EINVAL;
3486
3487 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3488 ret = cm_init_av_by_path(param->path, param->sgid_attr,
3489 &cm_id_priv->av,
3490 cm_id_priv);
3491 if (ret)
3492 goto out;
3493
3494 cm_id->service_id = param->service_id;
3495 cm_id->service_mask = ~cpu_to_be64(0);
3496 cm_id_priv->timeout_ms = param->timeout_ms;
3497 cm_id_priv->max_cm_retries = param->max_cm_retries;
3498 ret = cm_alloc_msg(cm_id_priv, &msg);
3499 if (ret)
3500 goto out;
3501
3502 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3503 param);
3504 msg->timeout_ms = cm_id_priv->timeout_ms;
3505 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3506
3507 spin_lock_irqsave(&cm_id_priv->lock, flags);
3508 if (cm_id->state == IB_CM_IDLE)
3509 ret = ib_post_send_mad(msg, NULL);
3510 else
3511 ret = -EINVAL;
3512
3513 if (ret) {
3514 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3515 cm_free_msg(msg);
3516 goto out;
3517 }
3518 cm_id->state = IB_CM_SIDR_REQ_SENT;
3519 cm_id_priv->msg = msg;
3520 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3521out:
3522 return ret;
3523}
3524EXPORT_SYMBOL(ib_send_cm_sidr_req);
3525
3526static void cm_format_sidr_req_event(struct cm_work *work,
3527 const struct cm_id_private *rx_cm_id,
3528 struct ib_cm_id *listen_id)
3529{
3530 struct cm_sidr_req_msg *sidr_req_msg;
3531 struct ib_cm_sidr_req_event_param *param;
3532
3533 sidr_req_msg = (struct cm_sidr_req_msg *)
3534 work->mad_recv_wc->recv_buf.mad;
3535 param = &work->cm_event.param.sidr_req_rcvd;
3536 param->pkey = IBA_GET(CM_SIDR_REQ_PARTITION_KEY, sidr_req_msg);
3537 param->listen_id = listen_id;
3538 param->service_id =
3539 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3540 param->bth_pkey = cm_get_bth_pkey(work);
3541 param->port = work->port->port_num;
3542 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3543 work->cm_event.private_data =
3544 IBA_GET_MEM_PTR(CM_SIDR_REQ_PRIVATE_DATA, sidr_req_msg);
3545}
3546
3547static int cm_sidr_req_handler(struct cm_work *work)
3548{
3549 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
3550 struct cm_sidr_req_msg *sidr_req_msg;
3551 struct ib_wc *wc;
3552 int ret;
3553
3554 cm_id_priv =
3555 cm_alloc_id_priv(work->port->cm_dev->ib_device, NULL, NULL);
3556 if (IS_ERR(cm_id_priv))
3557 return PTR_ERR(cm_id_priv);
3558
3559 /* Record SGID/SLID and request ID for lookup. */
3560 sidr_req_msg = (struct cm_sidr_req_msg *)
3561 work->mad_recv_wc->recv_buf.mad;
3562
3563 cm_id_priv->id.remote_id =
3564 cpu_to_be32(IBA_GET(CM_SIDR_REQ_REQUESTID, sidr_req_msg));
3565 cm_id_priv->id.service_id =
3566 cpu_to_be64(IBA_GET(CM_SIDR_REQ_SERVICEID, sidr_req_msg));
3567 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3568 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3569
3570 wc = work->mad_recv_wc->wc;
3571 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3572 cm_id_priv->av.dgid.global.interface_id = 0;
3573 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3574 work->mad_recv_wc->recv_buf.grh,
3575 &cm_id_priv->av);
3576 if (ret)
3577 goto out;
3578
3579 spin_lock_irq(&cm.lock);
3580 listen_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3581 if (listen_cm_id_priv) {
3582 spin_unlock_irq(&cm.lock);
3583 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3584 counter[CM_SIDR_REQ_COUNTER]);
3585 goto out; /* Duplicate message. */
3586 }
3587 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3588 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
3589 cm_id_priv->id.service_id);
3590 if (!listen_cm_id_priv) {
3591 spin_unlock_irq(&cm.lock);
3592 ib_send_cm_sidr_rep(&cm_id_priv->id,
3593 &(struct ib_cm_sidr_rep_param){
3594 .status = IB_SIDR_UNSUPPORTED });
3595 goto out; /* No match. */
3596 }
3597 spin_unlock_irq(&cm.lock);
3598
3599 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
3600 cm_id_priv->id.context = listen_cm_id_priv->id.context;
3601
3602 /*
3603 * A SIDR ID does not need to be in the xarray since it does not receive
3604 * mads, is not placed in the remote_id or remote_qpn rbtree, and does
3605 * not enter timewait.
3606 */
3607
3608 cm_format_sidr_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
3609 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
3610 cm_free_work(work);
3611 /*
3612 * A pointer to the listen_cm_id is held in the event, so this deref
3613 * must be after the event is delivered above.
3614 */
3615 cm_deref_id(listen_cm_id_priv);
3616 if (ret)
3617 cm_destroy_id(&cm_id_priv->id, ret);
3618 return 0;
3619out:
3620 ib_destroy_cm_id(&cm_id_priv->id);
3621 return -EINVAL;
3622}
3623
3624static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3625 struct cm_id_private *cm_id_priv,
3626 struct ib_cm_sidr_rep_param *param)
3627{
3628 cm_format_mad_ece_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3629 cm_id_priv->tid, param->ece.attr_mod);
3630 IBA_SET(CM_SIDR_REP_REQUESTID, sidr_rep_msg,
3631 be32_to_cpu(cm_id_priv->id.remote_id));
3632 IBA_SET(CM_SIDR_REP_STATUS, sidr_rep_msg, param->status);
3633 IBA_SET(CM_SIDR_REP_QPN, sidr_rep_msg, param->qp_num);
3634 IBA_SET(CM_SIDR_REP_SERVICEID, sidr_rep_msg,
3635 be64_to_cpu(cm_id_priv->id.service_id));
3636 IBA_SET(CM_SIDR_REP_Q_KEY, sidr_rep_msg, param->qkey);
3637 IBA_SET(CM_SIDR_REP_VENDOR_ID_L, sidr_rep_msg,
3638 param->ece.vendor_id & 0xFF);
3639 IBA_SET(CM_SIDR_REP_VENDOR_ID_H, sidr_rep_msg,
3640 (param->ece.vendor_id >> 8) & 0xFF);
3641
3642 if (param->info && param->info_length)
3643 IBA_SET_MEM(CM_SIDR_REP_ADDITIONAL_INFORMATION, sidr_rep_msg,
3644 param->info, param->info_length);
3645
3646 if (param->private_data && param->private_data_len)
3647 IBA_SET_MEM(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg,
3648 param->private_data, param->private_data_len);
3649}
3650
3651static int cm_send_sidr_rep_locked(struct cm_id_private *cm_id_priv,
3652 struct ib_cm_sidr_rep_param *param)
3653{
3654 struct ib_mad_send_buf *msg;
3655 int ret;
3656
3657 lockdep_assert_held(&cm_id_priv->lock);
3658
3659 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3660 (param->private_data &&
3661 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3662 return -EINVAL;
3663
3664 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_RCVD)
3665 return -EINVAL;
3666
3667 ret = cm_alloc_msg(cm_id_priv, &msg);
3668 if (ret)
3669 return ret;
3670
3671 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3672 param);
3673 ret = ib_post_send_mad(msg, NULL);
3674 if (ret) {
3675 cm_free_msg(msg);
3676 return ret;
3677 }
3678 cm_id_priv->id.state = IB_CM_IDLE;
3679 spin_lock_irq(&cm.lock);
3680 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3681 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3682 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3683 }
3684 spin_unlock_irq(&cm.lock);
3685 return 0;
3686}
3687
3688int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3689 struct ib_cm_sidr_rep_param *param)
3690{
3691 struct cm_id_private *cm_id_priv =
3692 container_of(cm_id, struct cm_id_private, id);
3693 unsigned long flags;
3694 int ret;
3695
3696 spin_lock_irqsave(&cm_id_priv->lock, flags);
3697 ret = cm_send_sidr_rep_locked(cm_id_priv, param);
3698 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3699 return ret;
3700}
3701EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3702
3703static void cm_format_sidr_rep_event(struct cm_work *work,
3704 const struct cm_id_private *cm_id_priv)
3705{
3706 struct cm_sidr_rep_msg *sidr_rep_msg;
3707 struct ib_cm_sidr_rep_event_param *param;
3708
3709 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3710 work->mad_recv_wc->recv_buf.mad;
3711 param = &work->cm_event.param.sidr_rep_rcvd;
3712 param->status = IBA_GET(CM_SIDR_REP_STATUS, sidr_rep_msg);
3713 param->qkey = IBA_GET(CM_SIDR_REP_Q_KEY, sidr_rep_msg);
3714 param->qpn = IBA_GET(CM_SIDR_REP_QPN, sidr_rep_msg);
3715 param->info = IBA_GET_MEM_PTR(CM_SIDR_REP_ADDITIONAL_INFORMATION,
3716 sidr_rep_msg);
3717 param->info_len = IBA_GET(CM_SIDR_REP_ADDITIONAL_INFORMATION_LENGTH,
3718 sidr_rep_msg);
3719 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3720 work->cm_event.private_data =
3721 IBA_GET_MEM_PTR(CM_SIDR_REP_PRIVATE_DATA, sidr_rep_msg);
3722}
3723
3724static int cm_sidr_rep_handler(struct cm_work *work)
3725{
3726 struct cm_sidr_rep_msg *sidr_rep_msg;
3727 struct cm_id_private *cm_id_priv;
3728
3729 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3730 work->mad_recv_wc->recv_buf.mad;
3731 cm_id_priv = cm_acquire_id(
3732 cpu_to_be32(IBA_GET(CM_SIDR_REP_REQUESTID, sidr_rep_msg)), 0);
3733 if (!cm_id_priv)
3734 return -EINVAL; /* Unmatched reply. */
3735
3736 spin_lock_irq(&cm_id_priv->lock);
3737 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3738 spin_unlock_irq(&cm_id_priv->lock);
3739 goto out;
3740 }
3741 cm_id_priv->id.state = IB_CM_IDLE;
3742 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3743 spin_unlock_irq(&cm_id_priv->lock);
3744
3745 cm_format_sidr_rep_event(work, cm_id_priv);
3746 cm_process_work(cm_id_priv, work);
3747 return 0;
3748out:
3749 cm_deref_id(cm_id_priv);
3750 return -EINVAL;
3751}
3752
3753static void cm_process_send_error(struct ib_mad_send_buf *msg,
3754 enum ib_wc_status wc_status)
3755{
3756 struct cm_id_private *cm_id_priv;
3757 struct ib_cm_event cm_event;
3758 enum ib_cm_state state;
3759 int ret;
3760
3761 memset(&cm_event, 0, sizeof cm_event);
3762 cm_id_priv = msg->context[0];
3763
3764 /* Discard old sends or ones without a response. */
3765 spin_lock_irq(&cm_id_priv->lock);
3766 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3767 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3768 goto discard;
3769
3770 pr_debug_ratelimited("CM: failed sending MAD in state %d. (%s)\n",
3771 state, ib_wc_status_msg(wc_status));
3772 switch (state) {
3773 case IB_CM_REQ_SENT:
3774 case IB_CM_MRA_REQ_RCVD:
3775 cm_reset_to_idle(cm_id_priv);
3776 cm_event.event = IB_CM_REQ_ERROR;
3777 break;
3778 case IB_CM_REP_SENT:
3779 case IB_CM_MRA_REP_RCVD:
3780 cm_reset_to_idle(cm_id_priv);
3781 cm_event.event = IB_CM_REP_ERROR;
3782 break;
3783 case IB_CM_DREQ_SENT:
3784 cm_enter_timewait(cm_id_priv);
3785 cm_event.event = IB_CM_DREQ_ERROR;
3786 break;
3787 case IB_CM_SIDR_REQ_SENT:
3788 cm_id_priv->id.state = IB_CM_IDLE;
3789 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3790 break;
3791 default:
3792 goto discard;
3793 }
3794 spin_unlock_irq(&cm_id_priv->lock);
3795 cm_event.param.send_status = wc_status;
3796
3797 /* No other events can occur on the cm_id at this point. */
3798 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3799 cm_free_msg(msg);
3800 if (ret)
3801 ib_destroy_cm_id(&cm_id_priv->id);
3802 return;
3803discard:
3804 spin_unlock_irq(&cm_id_priv->lock);
3805 cm_free_msg(msg);
3806}
3807
3808static void cm_send_handler(struct ib_mad_agent *mad_agent,
3809 struct ib_mad_send_wc *mad_send_wc)
3810{
3811 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3812 struct cm_port *port;
3813 u16 attr_index;
3814
3815 port = mad_agent->context;
3816 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3817 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3818
3819 /*
3820 * If the send was in response to a received message (context[0] is not
3821 * set to a cm_id), and is not a REJ, then it is a send that was
3822 * manually retried.
3823 */
3824 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3825 msg->retries = 1;
3826
3827 atomic_long_add(1 + msg->retries,
3828 &port->counter_group[CM_XMIT].counter[attr_index]);
3829 if (msg->retries)
3830 atomic_long_add(msg->retries,
3831 &port->counter_group[CM_XMIT_RETRIES].
3832 counter[attr_index]);
3833
3834 switch (mad_send_wc->status) {
3835 case IB_WC_SUCCESS:
3836 case IB_WC_WR_FLUSH_ERR:
3837 cm_free_msg(msg);
3838 break;
3839 default:
3840 if (msg->context[0] && msg->context[1])
3841 cm_process_send_error(msg, mad_send_wc->status);
3842 else
3843 cm_free_msg(msg);
3844 break;
3845 }
3846}
3847
3848static void cm_work_handler(struct work_struct *_work)
3849{
3850 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3851 int ret;
3852
3853 switch (work->cm_event.event) {
3854 case IB_CM_REQ_RECEIVED:
3855 ret = cm_req_handler(work);
3856 break;
3857 case IB_CM_MRA_RECEIVED:
3858 ret = cm_mra_handler(work);
3859 break;
3860 case IB_CM_REJ_RECEIVED:
3861 ret = cm_rej_handler(work);
3862 break;
3863 case IB_CM_REP_RECEIVED:
3864 ret = cm_rep_handler(work);
3865 break;
3866 case IB_CM_RTU_RECEIVED:
3867 ret = cm_rtu_handler(work);
3868 break;
3869 case IB_CM_USER_ESTABLISHED:
3870 ret = cm_establish_handler(work);
3871 break;
3872 case IB_CM_DREQ_RECEIVED:
3873 ret = cm_dreq_handler(work);
3874 break;
3875 case IB_CM_DREP_RECEIVED:
3876 ret = cm_drep_handler(work);
3877 break;
3878 case IB_CM_SIDR_REQ_RECEIVED:
3879 ret = cm_sidr_req_handler(work);
3880 break;
3881 case IB_CM_SIDR_REP_RECEIVED:
3882 ret = cm_sidr_rep_handler(work);
3883 break;
3884 case IB_CM_LAP_RECEIVED:
3885 ret = cm_lap_handler(work);
3886 break;
3887 case IB_CM_APR_RECEIVED:
3888 ret = cm_apr_handler(work);
3889 break;
3890 case IB_CM_TIMEWAIT_EXIT:
3891 ret = cm_timewait_handler(work);
3892 break;
3893 default:
3894 pr_debug("cm_event.event: 0x%x\n", work->cm_event.event);
3895 ret = -EINVAL;
3896 break;
3897 }
3898 if (ret)
3899 cm_free_work(work);
3900}
3901
3902static int cm_establish(struct ib_cm_id *cm_id)
3903{
3904 struct cm_id_private *cm_id_priv;
3905 struct cm_work *work;
3906 unsigned long flags;
3907 int ret = 0;
3908 struct cm_device *cm_dev;
3909
3910 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3911 if (!cm_dev)
3912 return -ENODEV;
3913
3914 work = kmalloc(sizeof *work, GFP_ATOMIC);
3915 if (!work)
3916 return -ENOMEM;
3917
3918 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3919 spin_lock_irqsave(&cm_id_priv->lock, flags);
3920 switch (cm_id->state)
3921 {
3922 case IB_CM_REP_SENT:
3923 case IB_CM_MRA_REP_RCVD:
3924 cm_id->state = IB_CM_ESTABLISHED;
3925 break;
3926 case IB_CM_ESTABLISHED:
3927 ret = -EISCONN;
3928 break;
3929 default:
3930 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
3931 be32_to_cpu(cm_id->local_id), cm_id->state);
3932 ret = -EINVAL;
3933 break;
3934 }
3935 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3936
3937 if (ret) {
3938 kfree(work);
3939 goto out;
3940 }
3941
3942 /*
3943 * The CM worker thread may try to destroy the cm_id before it
3944 * can execute this work item. To prevent potential deadlock,
3945 * we need to find the cm_id once we're in the context of the
3946 * worker thread, rather than holding a reference on it.
3947 */
3948 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3949 work->local_id = cm_id->local_id;
3950 work->remote_id = cm_id->remote_id;
3951 work->mad_recv_wc = NULL;
3952 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3953
3954 /* Check if the device started its remove_one */
3955 spin_lock_irqsave(&cm.lock, flags);
3956 if (!cm_dev->going_down) {
3957 queue_delayed_work(cm.wq, &work->work, 0);
3958 } else {
3959 kfree(work);
3960 ret = -ENODEV;
3961 }
3962 spin_unlock_irqrestore(&cm.lock, flags);
3963
3964out:
3965 return ret;
3966}
3967
3968static int cm_migrate(struct ib_cm_id *cm_id)
3969{
3970 struct cm_id_private *cm_id_priv;
3971 struct cm_av tmp_av;
3972 unsigned long flags;
3973 int tmp_send_port_not_ready;
3974 int ret = 0;
3975
3976 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3977 spin_lock_irqsave(&cm_id_priv->lock, flags);
3978 if (cm_id->state == IB_CM_ESTABLISHED &&
3979 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3980 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3981 cm_id->lap_state = IB_CM_LAP_IDLE;
3982 /* Swap address vector */
3983 tmp_av = cm_id_priv->av;
3984 cm_id_priv->av = cm_id_priv->alt_av;
3985 cm_id_priv->alt_av = tmp_av;
3986 /* Swap port send ready state */
3987 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3988 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3989 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3990 } else
3991 ret = -EINVAL;
3992 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3993
3994 return ret;
3995}
3996
3997int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3998{
3999 int ret;
4000
4001 switch (event) {
4002 case IB_EVENT_COMM_EST:
4003 ret = cm_establish(cm_id);
4004 break;
4005 case IB_EVENT_PATH_MIG:
4006 ret = cm_migrate(cm_id);
4007 break;
4008 default:
4009 ret = -EINVAL;
4010 }
4011 return ret;
4012}
4013EXPORT_SYMBOL(ib_cm_notify);
4014
4015static void cm_recv_handler(struct ib_mad_agent *mad_agent,
4016 struct ib_mad_send_buf *send_buf,
4017 struct ib_mad_recv_wc *mad_recv_wc)
4018{
4019 struct cm_port *port = mad_agent->context;
4020 struct cm_work *work;
4021 enum ib_cm_event_type event;
4022 bool alt_path = false;
4023 u16 attr_id;
4024 int paths = 0;
4025 int going_down = 0;
4026
4027 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4028 case CM_REQ_ATTR_ID:
4029 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4030 mad_recv_wc->recv_buf.mad);
4031 paths = 1 + (alt_path != 0);
4032 event = IB_CM_REQ_RECEIVED;
4033 break;
4034 case CM_MRA_ATTR_ID:
4035 event = IB_CM_MRA_RECEIVED;
4036 break;
4037 case CM_REJ_ATTR_ID:
4038 event = IB_CM_REJ_RECEIVED;
4039 break;
4040 case CM_REP_ATTR_ID:
4041 event = IB_CM_REP_RECEIVED;
4042 break;
4043 case CM_RTU_ATTR_ID:
4044 event = IB_CM_RTU_RECEIVED;
4045 break;
4046 case CM_DREQ_ATTR_ID:
4047 event = IB_CM_DREQ_RECEIVED;
4048 break;
4049 case CM_DREP_ATTR_ID:
4050 event = IB_CM_DREP_RECEIVED;
4051 break;
4052 case CM_SIDR_REQ_ATTR_ID:
4053 event = IB_CM_SIDR_REQ_RECEIVED;
4054 break;
4055 case CM_SIDR_REP_ATTR_ID:
4056 event = IB_CM_SIDR_REP_RECEIVED;
4057 break;
4058 case CM_LAP_ATTR_ID:
4059 paths = 1;
4060 event = IB_CM_LAP_RECEIVED;
4061 break;
4062 case CM_APR_ATTR_ID:
4063 event = IB_CM_APR_RECEIVED;
4064 break;
4065 default:
4066 ib_free_recv_mad(mad_recv_wc);
4067 return;
4068 }
4069
4070 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4071 atomic_long_inc(&port->counter_group[CM_RECV].
4072 counter[attr_id - CM_ATTR_ID_OFFSET]);
4073
4074 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4075 if (!work) {
4076 ib_free_recv_mad(mad_recv_wc);
4077 return;
4078 }
4079
4080 INIT_DELAYED_WORK(&work->work, cm_work_handler);
4081 work->cm_event.event = event;
4082 work->mad_recv_wc = mad_recv_wc;
4083 work->port = port;
4084
4085 /* Check if the device started its remove_one */
4086 spin_lock_irq(&cm.lock);
4087 if (!port->cm_dev->going_down)
4088 queue_delayed_work(cm.wq, &work->work, 0);
4089 else
4090 going_down = 1;
4091 spin_unlock_irq(&cm.lock);
4092
4093 if (going_down) {
4094 kfree(work);
4095 ib_free_recv_mad(mad_recv_wc);
4096 }
4097}
4098
4099static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4100 struct ib_qp_attr *qp_attr,
4101 int *qp_attr_mask)
4102{
4103 unsigned long flags;
4104 int ret;
4105
4106 spin_lock_irqsave(&cm_id_priv->lock, flags);
4107 switch (cm_id_priv->id.state) {
4108 case IB_CM_REQ_SENT:
4109 case IB_CM_MRA_REQ_RCVD:
4110 case IB_CM_REQ_RCVD:
4111 case IB_CM_MRA_REQ_SENT:
4112 case IB_CM_REP_RCVD:
4113 case IB_CM_MRA_REP_SENT:
4114 case IB_CM_REP_SENT:
4115 case IB_CM_MRA_REP_RCVD:
4116 case IB_CM_ESTABLISHED:
4117 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4118 IB_QP_PKEY_INDEX | IB_QP_PORT;
4119 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4120 if (cm_id_priv->responder_resources)
4121 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4122 IB_ACCESS_REMOTE_ATOMIC;
4123 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4124 qp_attr->port_num = cm_id_priv->av.port->port_num;
4125 ret = 0;
4126 break;
4127 default:
4128 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4129 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4130 cm_id_priv->id.state);
4131 ret = -EINVAL;
4132 break;
4133 }
4134 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4135 return ret;
4136}
4137
4138static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4139 struct ib_qp_attr *qp_attr,
4140 int *qp_attr_mask)
4141{
4142 unsigned long flags;
4143 int ret;
4144
4145 spin_lock_irqsave(&cm_id_priv->lock, flags);
4146 switch (cm_id_priv->id.state) {
4147 case IB_CM_REQ_RCVD:
4148 case IB_CM_MRA_REQ_SENT:
4149 case IB_CM_REP_RCVD:
4150 case IB_CM_MRA_REP_SENT:
4151 case IB_CM_REP_SENT:
4152 case IB_CM_MRA_REP_RCVD:
4153 case IB_CM_ESTABLISHED:
4154 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4155 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4156 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4157 qp_attr->path_mtu = cm_id_priv->path_mtu;
4158 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4159 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4160 if (cm_id_priv->qp_type == IB_QPT_RC ||
4161 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4162 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4163 IB_QP_MIN_RNR_TIMER;
4164 qp_attr->max_dest_rd_atomic =
4165 cm_id_priv->responder_resources;
4166 qp_attr->min_rnr_timer = 0;
4167 }
4168 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4169 *qp_attr_mask |= IB_QP_ALT_PATH;
4170 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4171 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4172 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4173 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4174 }
4175 ret = 0;
4176 break;
4177 default:
4178 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4179 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4180 cm_id_priv->id.state);
4181 ret = -EINVAL;
4182 break;
4183 }
4184 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4185 return ret;
4186}
4187
4188static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4189 struct ib_qp_attr *qp_attr,
4190 int *qp_attr_mask)
4191{
4192 unsigned long flags;
4193 int ret;
4194
4195 spin_lock_irqsave(&cm_id_priv->lock, flags);
4196 switch (cm_id_priv->id.state) {
4197 /* Allow transition to RTS before sending REP */
4198 case IB_CM_REQ_RCVD:
4199 case IB_CM_MRA_REQ_SENT:
4200
4201 case IB_CM_REP_RCVD:
4202 case IB_CM_MRA_REP_SENT:
4203 case IB_CM_REP_SENT:
4204 case IB_CM_MRA_REP_RCVD:
4205 case IB_CM_ESTABLISHED:
4206 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4207 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4208 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4209 switch (cm_id_priv->qp_type) {
4210 case IB_QPT_RC:
4211 case IB_QPT_XRC_INI:
4212 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4213 IB_QP_MAX_QP_RD_ATOMIC;
4214 qp_attr->retry_cnt = cm_id_priv->retry_count;
4215 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4216 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4217 fallthrough;
4218 case IB_QPT_XRC_TGT:
4219 *qp_attr_mask |= IB_QP_TIMEOUT;
4220 qp_attr->timeout = cm_id_priv->av.timeout;
4221 break;
4222 default:
4223 break;
4224 }
4225 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4226 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4227 qp_attr->path_mig_state = IB_MIG_REARM;
4228 }
4229 } else {
4230 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4231 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4232 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4233 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4234 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4235 qp_attr->path_mig_state = IB_MIG_REARM;
4236 }
4237 ret = 0;
4238 break;
4239 default:
4240 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4241 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4242 cm_id_priv->id.state);
4243 ret = -EINVAL;
4244 break;
4245 }
4246 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4247 return ret;
4248}
4249
4250int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4251 struct ib_qp_attr *qp_attr,
4252 int *qp_attr_mask)
4253{
4254 struct cm_id_private *cm_id_priv;
4255 int ret;
4256
4257 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4258 switch (qp_attr->qp_state) {
4259 case IB_QPS_INIT:
4260 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4261 break;
4262 case IB_QPS_RTR:
4263 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4264 break;
4265 case IB_QPS_RTS:
4266 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4267 break;
4268 default:
4269 ret = -EINVAL;
4270 break;
4271 }
4272 return ret;
4273}
4274EXPORT_SYMBOL(ib_cm_init_qp_attr);
4275
4276static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
4277 char *buf)
4278{
4279 struct cm_counter_group *group;
4280 struct cm_counter_attribute *cm_attr;
4281
4282 group = container_of(obj, struct cm_counter_group, obj);
4283 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
4284
4285 return sprintf(buf, "%ld\n",
4286 atomic_long_read(&group->counter[cm_attr->index]));
4287}
4288
4289static const struct sysfs_ops cm_counter_ops = {
4290 .show = cm_show_counter
4291};
4292
4293static struct kobj_type cm_counter_obj_type = {
4294 .sysfs_ops = &cm_counter_ops,
4295 .default_attrs = cm_counter_default_attrs
4296};
4297
4298static char *cm_devnode(struct device *dev, umode_t *mode)
4299{
4300 if (mode)
4301 *mode = 0666;
4302 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
4303}
4304
4305struct class cm_class = {
4306 .owner = THIS_MODULE,
4307 .name = "infiniband_cm",
4308 .devnode = cm_devnode,
4309};
4310EXPORT_SYMBOL(cm_class);
4311
4312static int cm_create_port_fs(struct cm_port *port)
4313{
4314 int i, ret;
4315
4316 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
4317 ret = ib_port_register_module_stat(port->cm_dev->ib_device,
4318 port->port_num,
4319 &port->counter_group[i].obj,
4320 &cm_counter_obj_type,
4321 counter_group_names[i]);
4322 if (ret)
4323 goto error;
4324 }
4325
4326 return 0;
4327
4328error:
4329 while (i--)
4330 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4331 return ret;
4332
4333}
4334
4335static void cm_remove_port_fs(struct cm_port *port)
4336{
4337 int i;
4338
4339 for (i = 0; i < CM_COUNTER_GROUPS; i++)
4340 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4341
4342}
4343
4344static int cm_add_one(struct ib_device *ib_device)
4345{
4346 struct cm_device *cm_dev;
4347 struct cm_port *port;
4348 struct ib_mad_reg_req reg_req = {
4349 .mgmt_class = IB_MGMT_CLASS_CM,
4350 .mgmt_class_version = IB_CM_CLASS_VERSION,
4351 };
4352 struct ib_port_modify port_modify = {
4353 .set_port_cap_mask = IB_PORT_CM_SUP
4354 };
4355 unsigned long flags;
4356 int ret;
4357 int count = 0;
4358 u8 i;
4359
4360 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4361 GFP_KERNEL);
4362 if (!cm_dev)
4363 return -ENOMEM;
4364
4365 cm_dev->ib_device = ib_device;
4366 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4367 cm_dev->going_down = 0;
4368
4369 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4370 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4371 if (!rdma_cap_ib_cm(ib_device, i))
4372 continue;
4373
4374 port = kzalloc(sizeof *port, GFP_KERNEL);
4375 if (!port) {
4376 ret = -ENOMEM;
4377 goto error1;
4378 }
4379
4380 cm_dev->port[i-1] = port;
4381 port->cm_dev = cm_dev;
4382 port->port_num = i;
4383
4384 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4385 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4386
4387 ret = cm_create_port_fs(port);
4388 if (ret)
4389 goto error1;
4390
4391 port->mad_agent = ib_register_mad_agent(ib_device, i,
4392 IB_QPT_GSI,
4393 ®_req,
4394 0,
4395 cm_send_handler,
4396 cm_recv_handler,
4397 port,
4398 0);
4399 if (IS_ERR(port->mad_agent)) {
4400 ret = PTR_ERR(port->mad_agent);
4401 goto error2;
4402 }
4403
4404 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4405 if (ret)
4406 goto error3;
4407
4408 count++;
4409 }
4410
4411 if (!count) {
4412 ret = -EOPNOTSUPP;
4413 goto free;
4414 }
4415
4416 ib_set_client_data(ib_device, &cm_client, cm_dev);
4417
4418 write_lock_irqsave(&cm.device_lock, flags);
4419 list_add_tail(&cm_dev->list, &cm.device_list);
4420 write_unlock_irqrestore(&cm.device_lock, flags);
4421 return 0;
4422
4423error3:
4424 ib_unregister_mad_agent(port->mad_agent);
4425error2:
4426 cm_remove_port_fs(port);
4427error1:
4428 port_modify.set_port_cap_mask = 0;
4429 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4430 kfree(port);
4431 while (--i) {
4432 if (!rdma_cap_ib_cm(ib_device, i))
4433 continue;
4434
4435 port = cm_dev->port[i-1];
4436 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4437 ib_unregister_mad_agent(port->mad_agent);
4438 cm_remove_port_fs(port);
4439 kfree(port);
4440 }
4441free:
4442 kfree(cm_dev);
4443 return ret;
4444}
4445
4446static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4447{
4448 struct cm_device *cm_dev = client_data;
4449 struct cm_port *port;
4450 struct cm_id_private *cm_id_priv;
4451 struct ib_mad_agent *cur_mad_agent;
4452 struct ib_port_modify port_modify = {
4453 .clr_port_cap_mask = IB_PORT_CM_SUP
4454 };
4455 unsigned long flags;
4456 int i;
4457
4458 write_lock_irqsave(&cm.device_lock, flags);
4459 list_del(&cm_dev->list);
4460 write_unlock_irqrestore(&cm.device_lock, flags);
4461
4462 spin_lock_irq(&cm.lock);
4463 cm_dev->going_down = 1;
4464 spin_unlock_irq(&cm.lock);
4465
4466 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4467 if (!rdma_cap_ib_cm(ib_device, i))
4468 continue;
4469
4470 port = cm_dev->port[i-1];
4471 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4472 /* Mark all the cm_id's as not valid */
4473 spin_lock_irq(&cm.lock);
4474 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4475 cm_id_priv->altr_send_port_not_ready = 1;
4476 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4477 cm_id_priv->prim_send_port_not_ready = 1;
4478 spin_unlock_irq(&cm.lock);
4479 /*
4480 * We flush the queue here after the going_down set, this
4481 * verify that no new works will be queued in the recv handler,
4482 * after that we can call the unregister_mad_agent
4483 */
4484 flush_workqueue(cm.wq);
4485 spin_lock_irq(&cm.state_lock);
4486 cur_mad_agent = port->mad_agent;
4487 port->mad_agent = NULL;
4488 spin_unlock_irq(&cm.state_lock);
4489 ib_unregister_mad_agent(cur_mad_agent);
4490 cm_remove_port_fs(port);
4491 kfree(port);
4492 }
4493
4494 kfree(cm_dev);
4495}
4496
4497static int __init ib_cm_init(void)
4498{
4499 int ret;
4500
4501 INIT_LIST_HEAD(&cm.device_list);
4502 rwlock_init(&cm.device_lock);
4503 spin_lock_init(&cm.lock);
4504 spin_lock_init(&cm.state_lock);
4505 cm.listen_service_table = RB_ROOT;
4506 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4507 cm.remote_id_table = RB_ROOT;
4508 cm.remote_qp_table = RB_ROOT;
4509 cm.remote_sidr_table = RB_ROOT;
4510 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);
4511 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4512 INIT_LIST_HEAD(&cm.timewait_list);
4513
4514 ret = class_register(&cm_class);
4515 if (ret) {
4516 ret = -ENOMEM;
4517 goto error1;
4518 }
4519
4520 cm.wq = alloc_workqueue("ib_cm", 0, 1);
4521 if (!cm.wq) {
4522 ret = -ENOMEM;
4523 goto error2;
4524 }
4525
4526 ret = ib_register_client(&cm_client);
4527 if (ret)
4528 goto error3;
4529
4530 return 0;
4531error3:
4532 destroy_workqueue(cm.wq);
4533error2:
4534 class_unregister(&cm_class);
4535error1:
4536 return ret;
4537}
4538
4539static void __exit ib_cm_cleanup(void)
4540{
4541 struct cm_timewait_info *timewait_info, *tmp;
4542
4543 spin_lock_irq(&cm.lock);
4544 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4545 cancel_delayed_work(&timewait_info->work.work);
4546 spin_unlock_irq(&cm.lock);
4547
4548 ib_unregister_client(&cm_client);
4549 destroy_workqueue(cm.wq);
4550
4551 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4552 list_del(&timewait_info->list);
4553 kfree(timewait_info);
4554 }
4555
4556 class_unregister(&cm_class);
4557 WARN_ON(!xa_empty(&cm.local_id_table));
4558}
4559
4560module_init(ib_cm_init);
4561module_exit(ib_cm_cleanup);