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1/*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36#include <linux/completion.h>
37#include <linux/dma-mapping.h>
38#include <linux/device.h>
39#include <linux/err.h>
40#include <linux/idr.h>
41#include <linux/interrupt.h>
42#include <linux/random.h>
43#include <linux/rbtree.h>
44#include <linux/spinlock.h>
45#include <linux/slab.h>
46#include <linux/sysfs.h>
47#include <linux/workqueue.h>
48#include <linux/kdev_t.h>
49
50#include <rdma/ib_cache.h>
51#include <rdma/ib_cm.h>
52#include "cm_msgs.h"
53
54MODULE_AUTHOR("Sean Hefty");
55MODULE_DESCRIPTION("InfiniBand CM");
56MODULE_LICENSE("Dual BSD/GPL");
57
58static void cm_add_one(struct ib_device *device);
59static void cm_remove_one(struct ib_device *device);
60
61static struct ib_client cm_client = {
62 .name = "cm",
63 .add = cm_add_one,
64 .remove = cm_remove_one
65};
66
67static struct ib_cm {
68 spinlock_t lock;
69 struct list_head device_list;
70 rwlock_t device_lock;
71 struct rb_root listen_service_table;
72 u64 listen_service_id;
73 /* struct rb_root peer_service_table; todo: fix peer to peer */
74 struct rb_root remote_qp_table;
75 struct rb_root remote_id_table;
76 struct rb_root remote_sidr_table;
77 struct idr local_id_table;
78 __be32 random_id_operand;
79 struct list_head timewait_list;
80 struct workqueue_struct *wq;
81} cm;
82
83/* Counter indexes ordered by attribute ID */
84enum {
85 CM_REQ_COUNTER,
86 CM_MRA_COUNTER,
87 CM_REJ_COUNTER,
88 CM_REP_COUNTER,
89 CM_RTU_COUNTER,
90 CM_DREQ_COUNTER,
91 CM_DREP_COUNTER,
92 CM_SIDR_REQ_COUNTER,
93 CM_SIDR_REP_COUNTER,
94 CM_LAP_COUNTER,
95 CM_APR_COUNTER,
96 CM_ATTR_COUNT,
97 CM_ATTR_ID_OFFSET = 0x0010,
98};
99
100enum {
101 CM_XMIT,
102 CM_XMIT_RETRIES,
103 CM_RECV,
104 CM_RECV_DUPLICATES,
105 CM_COUNTER_GROUPS
106};
107
108static char const counter_group_names[CM_COUNTER_GROUPS]
109 [sizeof("cm_rx_duplicates")] = {
110 "cm_tx_msgs", "cm_tx_retries",
111 "cm_rx_msgs", "cm_rx_duplicates"
112};
113
114struct cm_counter_group {
115 struct kobject obj;
116 atomic_long_t counter[CM_ATTR_COUNT];
117};
118
119struct cm_counter_attribute {
120 struct attribute attr;
121 int index;
122};
123
124#define CM_COUNTER_ATTR(_name, _index) \
125struct cm_counter_attribute cm_##_name##_counter_attr = { \
126 .attr = { .name = __stringify(_name), .mode = 0444 }, \
127 .index = _index \
128}
129
130static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
131static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
132static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
133static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
134static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
135static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
136static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
137static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
138static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
139static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
140static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
141
142static struct attribute *cm_counter_default_attrs[] = {
143 &cm_req_counter_attr.attr,
144 &cm_mra_counter_attr.attr,
145 &cm_rej_counter_attr.attr,
146 &cm_rep_counter_attr.attr,
147 &cm_rtu_counter_attr.attr,
148 &cm_dreq_counter_attr.attr,
149 &cm_drep_counter_attr.attr,
150 &cm_sidr_req_counter_attr.attr,
151 &cm_sidr_rep_counter_attr.attr,
152 &cm_lap_counter_attr.attr,
153 &cm_apr_counter_attr.attr,
154 NULL
155};
156
157struct cm_port {
158 struct cm_device *cm_dev;
159 struct ib_mad_agent *mad_agent;
160 struct kobject port_obj;
161 u8 port_num;
162 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
163};
164
165struct cm_device {
166 struct list_head list;
167 struct ib_device *ib_device;
168 struct device *device;
169 u8 ack_delay;
170 struct cm_port *port[0];
171};
172
173struct cm_av {
174 struct cm_port *port;
175 union ib_gid dgid;
176 struct ib_ah_attr ah_attr;
177 u16 pkey_index;
178 u8 timeout;
179};
180
181struct cm_work {
182 struct delayed_work work;
183 struct list_head list;
184 struct cm_port *port;
185 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
186 __be32 local_id; /* Established / timewait */
187 __be32 remote_id;
188 struct ib_cm_event cm_event;
189 struct ib_sa_path_rec path[0];
190};
191
192struct cm_timewait_info {
193 struct cm_work work; /* Must be first. */
194 struct list_head list;
195 struct rb_node remote_qp_node;
196 struct rb_node remote_id_node;
197 __be64 remote_ca_guid;
198 __be32 remote_qpn;
199 u8 inserted_remote_qp;
200 u8 inserted_remote_id;
201};
202
203struct cm_id_private {
204 struct ib_cm_id id;
205
206 struct rb_node service_node;
207 struct rb_node sidr_id_node;
208 spinlock_t lock; /* Do not acquire inside cm.lock */
209 struct completion comp;
210 atomic_t refcount;
211
212 struct ib_mad_send_buf *msg;
213 struct cm_timewait_info *timewait_info;
214 /* todo: use alternate port on send failure */
215 struct cm_av av;
216 struct cm_av alt_av;
217 struct ib_cm_compare_data *compare_data;
218
219 void *private_data;
220 __be64 tid;
221 __be32 local_qpn;
222 __be32 remote_qpn;
223 enum ib_qp_type qp_type;
224 __be32 sq_psn;
225 __be32 rq_psn;
226 int timeout_ms;
227 enum ib_mtu path_mtu;
228 __be16 pkey;
229 u8 private_data_len;
230 u8 max_cm_retries;
231 u8 peer_to_peer;
232 u8 responder_resources;
233 u8 initiator_depth;
234 u8 retry_count;
235 u8 rnr_retry_count;
236 u8 service_timeout;
237 u8 target_ack_delay;
238
239 struct list_head work_list;
240 atomic_t work_count;
241};
242
243static void cm_work_handler(struct work_struct *work);
244
245static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
246{
247 if (atomic_dec_and_test(&cm_id_priv->refcount))
248 complete(&cm_id_priv->comp);
249}
250
251static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
252 struct ib_mad_send_buf **msg)
253{
254 struct ib_mad_agent *mad_agent;
255 struct ib_mad_send_buf *m;
256 struct ib_ah *ah;
257
258 mad_agent = cm_id_priv->av.port->mad_agent;
259 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
260 if (IS_ERR(ah))
261 return PTR_ERR(ah);
262
263 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
264 cm_id_priv->av.pkey_index,
265 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
266 GFP_ATOMIC);
267 if (IS_ERR(m)) {
268 ib_destroy_ah(ah);
269 return PTR_ERR(m);
270 }
271
272 /* Timeout set by caller if response is expected. */
273 m->ah = ah;
274 m->retries = cm_id_priv->max_cm_retries;
275
276 atomic_inc(&cm_id_priv->refcount);
277 m->context[0] = cm_id_priv;
278 *msg = m;
279 return 0;
280}
281
282static int cm_alloc_response_msg(struct cm_port *port,
283 struct ib_mad_recv_wc *mad_recv_wc,
284 struct ib_mad_send_buf **msg)
285{
286 struct ib_mad_send_buf *m;
287 struct ib_ah *ah;
288
289 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
290 mad_recv_wc->recv_buf.grh, port->port_num);
291 if (IS_ERR(ah))
292 return PTR_ERR(ah);
293
294 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
295 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
296 GFP_ATOMIC);
297 if (IS_ERR(m)) {
298 ib_destroy_ah(ah);
299 return PTR_ERR(m);
300 }
301 m->ah = ah;
302 *msg = m;
303 return 0;
304}
305
306static void cm_free_msg(struct ib_mad_send_buf *msg)
307{
308 ib_destroy_ah(msg->ah);
309 if (msg->context[0])
310 cm_deref_id(msg->context[0]);
311 ib_free_send_mad(msg);
312}
313
314static void * cm_copy_private_data(const void *private_data,
315 u8 private_data_len)
316{
317 void *data;
318
319 if (!private_data || !private_data_len)
320 return NULL;
321
322 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
323 if (!data)
324 return ERR_PTR(-ENOMEM);
325
326 return data;
327}
328
329static void cm_set_private_data(struct cm_id_private *cm_id_priv,
330 void *private_data, u8 private_data_len)
331{
332 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
333 kfree(cm_id_priv->private_data);
334
335 cm_id_priv->private_data = private_data;
336 cm_id_priv->private_data_len = private_data_len;
337}
338
339static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
340 struct ib_grh *grh, struct cm_av *av)
341{
342 av->port = port;
343 av->pkey_index = wc->pkey_index;
344 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
345 grh, &av->ah_attr);
346}
347
348static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
349{
350 struct cm_device *cm_dev;
351 struct cm_port *port = NULL;
352 unsigned long flags;
353 int ret;
354 u8 p;
355
356 read_lock_irqsave(&cm.device_lock, flags);
357 list_for_each_entry(cm_dev, &cm.device_list, list) {
358 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
359 &p, NULL)) {
360 port = cm_dev->port[p-1];
361 break;
362 }
363 }
364 read_unlock_irqrestore(&cm.device_lock, flags);
365
366 if (!port)
367 return -EINVAL;
368
369 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
370 be16_to_cpu(path->pkey), &av->pkey_index);
371 if (ret)
372 return ret;
373
374 av->port = port;
375 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
376 &av->ah_attr);
377 av->timeout = path->packet_life_time + 1;
378 return 0;
379}
380
381static int cm_alloc_id(struct cm_id_private *cm_id_priv)
382{
383 unsigned long flags;
384 int ret, id;
385 static int next_id;
386
387 do {
388 spin_lock_irqsave(&cm.lock, flags);
389 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
390 next_id, &id);
391 if (!ret)
392 next_id = ((unsigned) id + 1) & MAX_ID_MASK;
393 spin_unlock_irqrestore(&cm.lock, flags);
394 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
395
396 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
397 return ret;
398}
399
400static void cm_free_id(__be32 local_id)
401{
402 spin_lock_irq(&cm.lock);
403 idr_remove(&cm.local_id_table,
404 (__force int) (local_id ^ cm.random_id_operand));
405 spin_unlock_irq(&cm.lock);
406}
407
408static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
409{
410 struct cm_id_private *cm_id_priv;
411
412 cm_id_priv = idr_find(&cm.local_id_table,
413 (__force int) (local_id ^ cm.random_id_operand));
414 if (cm_id_priv) {
415 if (cm_id_priv->id.remote_id == remote_id)
416 atomic_inc(&cm_id_priv->refcount);
417 else
418 cm_id_priv = NULL;
419 }
420
421 return cm_id_priv;
422}
423
424static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
425{
426 struct cm_id_private *cm_id_priv;
427
428 spin_lock_irq(&cm.lock);
429 cm_id_priv = cm_get_id(local_id, remote_id);
430 spin_unlock_irq(&cm.lock);
431
432 return cm_id_priv;
433}
434
435static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
436{
437 int i;
438
439 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
440 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
441 ((unsigned long *) mask)[i];
442}
443
444static int cm_compare_data(struct ib_cm_compare_data *src_data,
445 struct ib_cm_compare_data *dst_data)
446{
447 u8 src[IB_CM_COMPARE_SIZE];
448 u8 dst[IB_CM_COMPARE_SIZE];
449
450 if (!src_data || !dst_data)
451 return 0;
452
453 cm_mask_copy(src, src_data->data, dst_data->mask);
454 cm_mask_copy(dst, dst_data->data, src_data->mask);
455 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
456}
457
458static int cm_compare_private_data(u8 *private_data,
459 struct ib_cm_compare_data *dst_data)
460{
461 u8 src[IB_CM_COMPARE_SIZE];
462
463 if (!dst_data)
464 return 0;
465
466 cm_mask_copy(src, private_data, dst_data->mask);
467 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
468}
469
470/*
471 * Trivial helpers to strip endian annotation and compare; the
472 * endianness doesn't actually matter since we just need a stable
473 * order for the RB tree.
474 */
475static int be32_lt(__be32 a, __be32 b)
476{
477 return (__force u32) a < (__force u32) b;
478}
479
480static int be32_gt(__be32 a, __be32 b)
481{
482 return (__force u32) a > (__force u32) b;
483}
484
485static int be64_lt(__be64 a, __be64 b)
486{
487 return (__force u64) a < (__force u64) b;
488}
489
490static int be64_gt(__be64 a, __be64 b)
491{
492 return (__force u64) a > (__force u64) b;
493}
494
495static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
496{
497 struct rb_node **link = &cm.listen_service_table.rb_node;
498 struct rb_node *parent = NULL;
499 struct cm_id_private *cur_cm_id_priv;
500 __be64 service_id = cm_id_priv->id.service_id;
501 __be64 service_mask = cm_id_priv->id.service_mask;
502 int data_cmp;
503
504 while (*link) {
505 parent = *link;
506 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
507 service_node);
508 data_cmp = cm_compare_data(cm_id_priv->compare_data,
509 cur_cm_id_priv->compare_data);
510 if ((cur_cm_id_priv->id.service_mask & service_id) ==
511 (service_mask & cur_cm_id_priv->id.service_id) &&
512 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
513 !data_cmp)
514 return cur_cm_id_priv;
515
516 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
517 link = &(*link)->rb_left;
518 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
519 link = &(*link)->rb_right;
520 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
521 link = &(*link)->rb_left;
522 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
523 link = &(*link)->rb_right;
524 else if (data_cmp < 0)
525 link = &(*link)->rb_left;
526 else
527 link = &(*link)->rb_right;
528 }
529 rb_link_node(&cm_id_priv->service_node, parent, link);
530 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
531 return NULL;
532}
533
534static struct cm_id_private * cm_find_listen(struct ib_device *device,
535 __be64 service_id,
536 u8 *private_data)
537{
538 struct rb_node *node = cm.listen_service_table.rb_node;
539 struct cm_id_private *cm_id_priv;
540 int data_cmp;
541
542 while (node) {
543 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
544 data_cmp = cm_compare_private_data(private_data,
545 cm_id_priv->compare_data);
546 if ((cm_id_priv->id.service_mask & service_id) ==
547 cm_id_priv->id.service_id &&
548 (cm_id_priv->id.device == device) && !data_cmp)
549 return cm_id_priv;
550
551 if (device < cm_id_priv->id.device)
552 node = node->rb_left;
553 else if (device > cm_id_priv->id.device)
554 node = node->rb_right;
555 else if (be64_lt(service_id, cm_id_priv->id.service_id))
556 node = node->rb_left;
557 else if (be64_gt(service_id, cm_id_priv->id.service_id))
558 node = node->rb_right;
559 else if (data_cmp < 0)
560 node = node->rb_left;
561 else
562 node = node->rb_right;
563 }
564 return NULL;
565}
566
567static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
568 *timewait_info)
569{
570 struct rb_node **link = &cm.remote_id_table.rb_node;
571 struct rb_node *parent = NULL;
572 struct cm_timewait_info *cur_timewait_info;
573 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
574 __be32 remote_id = timewait_info->work.remote_id;
575
576 while (*link) {
577 parent = *link;
578 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
579 remote_id_node);
580 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
581 link = &(*link)->rb_left;
582 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
583 link = &(*link)->rb_right;
584 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
585 link = &(*link)->rb_left;
586 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
587 link = &(*link)->rb_right;
588 else
589 return cur_timewait_info;
590 }
591 timewait_info->inserted_remote_id = 1;
592 rb_link_node(&timewait_info->remote_id_node, parent, link);
593 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
594 return NULL;
595}
596
597static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
598 __be32 remote_id)
599{
600 struct rb_node *node = cm.remote_id_table.rb_node;
601 struct cm_timewait_info *timewait_info;
602
603 while (node) {
604 timewait_info = rb_entry(node, struct cm_timewait_info,
605 remote_id_node);
606 if (be32_lt(remote_id, timewait_info->work.remote_id))
607 node = node->rb_left;
608 else if (be32_gt(remote_id, timewait_info->work.remote_id))
609 node = node->rb_right;
610 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
611 node = node->rb_left;
612 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
613 node = node->rb_right;
614 else
615 return timewait_info;
616 }
617 return NULL;
618}
619
620static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
621 *timewait_info)
622{
623 struct rb_node **link = &cm.remote_qp_table.rb_node;
624 struct rb_node *parent = NULL;
625 struct cm_timewait_info *cur_timewait_info;
626 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
627 __be32 remote_qpn = timewait_info->remote_qpn;
628
629 while (*link) {
630 parent = *link;
631 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
632 remote_qp_node);
633 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
634 link = &(*link)->rb_left;
635 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
636 link = &(*link)->rb_right;
637 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
638 link = &(*link)->rb_left;
639 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
640 link = &(*link)->rb_right;
641 else
642 return cur_timewait_info;
643 }
644 timewait_info->inserted_remote_qp = 1;
645 rb_link_node(&timewait_info->remote_qp_node, parent, link);
646 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
647 return NULL;
648}
649
650static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
651 *cm_id_priv)
652{
653 struct rb_node **link = &cm.remote_sidr_table.rb_node;
654 struct rb_node *parent = NULL;
655 struct cm_id_private *cur_cm_id_priv;
656 union ib_gid *port_gid = &cm_id_priv->av.dgid;
657 __be32 remote_id = cm_id_priv->id.remote_id;
658
659 while (*link) {
660 parent = *link;
661 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
662 sidr_id_node);
663 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
664 link = &(*link)->rb_left;
665 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
666 link = &(*link)->rb_right;
667 else {
668 int cmp;
669 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
670 sizeof *port_gid);
671 if (cmp < 0)
672 link = &(*link)->rb_left;
673 else if (cmp > 0)
674 link = &(*link)->rb_right;
675 else
676 return cur_cm_id_priv;
677 }
678 }
679 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
680 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
681 return NULL;
682}
683
684static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
685 enum ib_cm_sidr_status status)
686{
687 struct ib_cm_sidr_rep_param param;
688
689 memset(¶m, 0, sizeof param);
690 param.status = status;
691 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m);
692}
693
694struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
695 ib_cm_handler cm_handler,
696 void *context)
697{
698 struct cm_id_private *cm_id_priv;
699 int ret;
700
701 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
702 if (!cm_id_priv)
703 return ERR_PTR(-ENOMEM);
704
705 cm_id_priv->id.state = IB_CM_IDLE;
706 cm_id_priv->id.device = device;
707 cm_id_priv->id.cm_handler = cm_handler;
708 cm_id_priv->id.context = context;
709 cm_id_priv->id.remote_cm_qpn = 1;
710 ret = cm_alloc_id(cm_id_priv);
711 if (ret)
712 goto error;
713
714 spin_lock_init(&cm_id_priv->lock);
715 init_completion(&cm_id_priv->comp);
716 INIT_LIST_HEAD(&cm_id_priv->work_list);
717 atomic_set(&cm_id_priv->work_count, -1);
718 atomic_set(&cm_id_priv->refcount, 1);
719 return &cm_id_priv->id;
720
721error:
722 kfree(cm_id_priv);
723 return ERR_PTR(-ENOMEM);
724}
725EXPORT_SYMBOL(ib_create_cm_id);
726
727static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
728{
729 struct cm_work *work;
730
731 if (list_empty(&cm_id_priv->work_list))
732 return NULL;
733
734 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
735 list_del(&work->list);
736 return work;
737}
738
739static void cm_free_work(struct cm_work *work)
740{
741 if (work->mad_recv_wc)
742 ib_free_recv_mad(work->mad_recv_wc);
743 kfree(work);
744}
745
746static inline int cm_convert_to_ms(int iba_time)
747{
748 /* approximate conversion to ms from 4.096us x 2^iba_time */
749 return 1 << max(iba_time - 8, 0);
750}
751
752/*
753 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
754 * Because of how ack_timeout is stored, adding one doubles the timeout.
755 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
756 * increment it (round up) only if the other is within 50%.
757 */
758static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
759{
760 int ack_timeout = packet_life_time + 1;
761
762 if (ack_timeout >= ca_ack_delay)
763 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
764 else
765 ack_timeout = ca_ack_delay +
766 (ack_timeout >= (ca_ack_delay - 1));
767
768 return min(31, ack_timeout);
769}
770
771static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
772{
773 if (timewait_info->inserted_remote_id) {
774 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
775 timewait_info->inserted_remote_id = 0;
776 }
777
778 if (timewait_info->inserted_remote_qp) {
779 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
780 timewait_info->inserted_remote_qp = 0;
781 }
782}
783
784static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
785{
786 struct cm_timewait_info *timewait_info;
787
788 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
789 if (!timewait_info)
790 return ERR_PTR(-ENOMEM);
791
792 timewait_info->work.local_id = local_id;
793 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
794 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
795 return timewait_info;
796}
797
798static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
799{
800 int wait_time;
801 unsigned long flags;
802
803 spin_lock_irqsave(&cm.lock, flags);
804 cm_cleanup_timewait(cm_id_priv->timewait_info);
805 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
806 spin_unlock_irqrestore(&cm.lock, flags);
807
808 /*
809 * The cm_id could be destroyed by the user before we exit timewait.
810 * To protect against this, we search for the cm_id after exiting
811 * timewait before notifying the user that we've exited timewait.
812 */
813 cm_id_priv->id.state = IB_CM_TIMEWAIT;
814 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
815 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
816 msecs_to_jiffies(wait_time));
817 cm_id_priv->timewait_info = NULL;
818}
819
820static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
821{
822 unsigned long flags;
823
824 cm_id_priv->id.state = IB_CM_IDLE;
825 if (cm_id_priv->timewait_info) {
826 spin_lock_irqsave(&cm.lock, flags);
827 cm_cleanup_timewait(cm_id_priv->timewait_info);
828 spin_unlock_irqrestore(&cm.lock, flags);
829 kfree(cm_id_priv->timewait_info);
830 cm_id_priv->timewait_info = NULL;
831 }
832}
833
834static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
835{
836 struct cm_id_private *cm_id_priv;
837 struct cm_work *work;
838
839 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
840retest:
841 spin_lock_irq(&cm_id_priv->lock);
842 switch (cm_id->state) {
843 case IB_CM_LISTEN:
844 cm_id->state = IB_CM_IDLE;
845 spin_unlock_irq(&cm_id_priv->lock);
846 spin_lock_irq(&cm.lock);
847 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
848 spin_unlock_irq(&cm.lock);
849 break;
850 case IB_CM_SIDR_REQ_SENT:
851 cm_id->state = IB_CM_IDLE;
852 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
853 spin_unlock_irq(&cm_id_priv->lock);
854 break;
855 case IB_CM_SIDR_REQ_RCVD:
856 spin_unlock_irq(&cm_id_priv->lock);
857 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
858 break;
859 case IB_CM_REQ_SENT:
860 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
861 spin_unlock_irq(&cm_id_priv->lock);
862 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
863 &cm_id_priv->id.device->node_guid,
864 sizeof cm_id_priv->id.device->node_guid,
865 NULL, 0);
866 break;
867 case IB_CM_REQ_RCVD:
868 if (err == -ENOMEM) {
869 /* Do not reject to allow future retries. */
870 cm_reset_to_idle(cm_id_priv);
871 spin_unlock_irq(&cm_id_priv->lock);
872 } else {
873 spin_unlock_irq(&cm_id_priv->lock);
874 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
875 NULL, 0, NULL, 0);
876 }
877 break;
878 case IB_CM_MRA_REQ_RCVD:
879 case IB_CM_REP_SENT:
880 case IB_CM_MRA_REP_RCVD:
881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
882 /* Fall through */
883 case IB_CM_MRA_REQ_SENT:
884 case IB_CM_REP_RCVD:
885 case IB_CM_MRA_REP_SENT:
886 spin_unlock_irq(&cm_id_priv->lock);
887 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
888 NULL, 0, NULL, 0);
889 break;
890 case IB_CM_ESTABLISHED:
891 spin_unlock_irq(&cm_id_priv->lock);
892 ib_send_cm_dreq(cm_id, NULL, 0);
893 goto retest;
894 case IB_CM_DREQ_SENT:
895 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
896 cm_enter_timewait(cm_id_priv);
897 spin_unlock_irq(&cm_id_priv->lock);
898 break;
899 case IB_CM_DREQ_RCVD:
900 spin_unlock_irq(&cm_id_priv->lock);
901 ib_send_cm_drep(cm_id, NULL, 0);
902 break;
903 default:
904 spin_unlock_irq(&cm_id_priv->lock);
905 break;
906 }
907
908 cm_free_id(cm_id->local_id);
909 cm_deref_id(cm_id_priv);
910 wait_for_completion(&cm_id_priv->comp);
911 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
912 cm_free_work(work);
913 kfree(cm_id_priv->compare_data);
914 kfree(cm_id_priv->private_data);
915 kfree(cm_id_priv);
916}
917
918void ib_destroy_cm_id(struct ib_cm_id *cm_id)
919{
920 cm_destroy_id(cm_id, 0);
921}
922EXPORT_SYMBOL(ib_destroy_cm_id);
923
924int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
925 struct ib_cm_compare_data *compare_data)
926{
927 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
928 unsigned long flags;
929 int ret = 0;
930
931 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
932 service_id &= service_mask;
933 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
934 (service_id != IB_CM_ASSIGN_SERVICE_ID))
935 return -EINVAL;
936
937 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
938 if (cm_id->state != IB_CM_IDLE)
939 return -EINVAL;
940
941 if (compare_data) {
942 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
943 GFP_KERNEL);
944 if (!cm_id_priv->compare_data)
945 return -ENOMEM;
946 cm_mask_copy(cm_id_priv->compare_data->data,
947 compare_data->data, compare_data->mask);
948 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
949 IB_CM_COMPARE_SIZE);
950 }
951
952 cm_id->state = IB_CM_LISTEN;
953
954 spin_lock_irqsave(&cm.lock, flags);
955 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
956 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
957 cm_id->service_mask = ~cpu_to_be64(0);
958 } else {
959 cm_id->service_id = service_id;
960 cm_id->service_mask = service_mask;
961 }
962 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
963 spin_unlock_irqrestore(&cm.lock, flags);
964
965 if (cur_cm_id_priv) {
966 cm_id->state = IB_CM_IDLE;
967 kfree(cm_id_priv->compare_data);
968 cm_id_priv->compare_data = NULL;
969 ret = -EBUSY;
970 }
971 return ret;
972}
973EXPORT_SYMBOL(ib_cm_listen);
974
975static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
976 enum cm_msg_sequence msg_seq)
977{
978 u64 hi_tid, low_tid;
979
980 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
981 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
982 (msg_seq << 30));
983 return cpu_to_be64(hi_tid | low_tid);
984}
985
986static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
987 __be16 attr_id, __be64 tid)
988{
989 hdr->base_version = IB_MGMT_BASE_VERSION;
990 hdr->mgmt_class = IB_MGMT_CLASS_CM;
991 hdr->class_version = IB_CM_CLASS_VERSION;
992 hdr->method = IB_MGMT_METHOD_SEND;
993 hdr->attr_id = attr_id;
994 hdr->tid = tid;
995}
996
997static void cm_format_req(struct cm_req_msg *req_msg,
998 struct cm_id_private *cm_id_priv,
999 struct ib_cm_req_param *param)
1000{
1001 struct ib_sa_path_rec *pri_path = param->primary_path;
1002 struct ib_sa_path_rec *alt_path = param->alternate_path;
1003
1004 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1005 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1006
1007 req_msg->local_comm_id = cm_id_priv->id.local_id;
1008 req_msg->service_id = param->service_id;
1009 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1010 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1011 cm_req_set_resp_res(req_msg, param->responder_resources);
1012 cm_req_set_init_depth(req_msg, param->initiator_depth);
1013 cm_req_set_remote_resp_timeout(req_msg,
1014 param->remote_cm_response_timeout);
1015 cm_req_set_qp_type(req_msg, param->qp_type);
1016 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1017 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1018 cm_req_set_local_resp_timeout(req_msg,
1019 param->local_cm_response_timeout);
1020 cm_req_set_retry_count(req_msg, param->retry_count);
1021 req_msg->pkey = param->primary_path->pkey;
1022 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1023 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1024 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1025 cm_req_set_srq(req_msg, param->srq);
1026
1027 if (pri_path->hop_limit <= 1) {
1028 req_msg->primary_local_lid = pri_path->slid;
1029 req_msg->primary_remote_lid = pri_path->dlid;
1030 } else {
1031 /* Work-around until there's a way to obtain remote LID info */
1032 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1033 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1034 }
1035 req_msg->primary_local_gid = pri_path->sgid;
1036 req_msg->primary_remote_gid = pri_path->dgid;
1037 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1038 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1039 req_msg->primary_traffic_class = pri_path->traffic_class;
1040 req_msg->primary_hop_limit = pri_path->hop_limit;
1041 cm_req_set_primary_sl(req_msg, pri_path->sl);
1042 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1043 cm_req_set_primary_local_ack_timeout(req_msg,
1044 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1045 pri_path->packet_life_time));
1046
1047 if (alt_path) {
1048 if (alt_path->hop_limit <= 1) {
1049 req_msg->alt_local_lid = alt_path->slid;
1050 req_msg->alt_remote_lid = alt_path->dlid;
1051 } else {
1052 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1053 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1054 }
1055 req_msg->alt_local_gid = alt_path->sgid;
1056 req_msg->alt_remote_gid = alt_path->dgid;
1057 cm_req_set_alt_flow_label(req_msg,
1058 alt_path->flow_label);
1059 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1060 req_msg->alt_traffic_class = alt_path->traffic_class;
1061 req_msg->alt_hop_limit = alt_path->hop_limit;
1062 cm_req_set_alt_sl(req_msg, alt_path->sl);
1063 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1064 cm_req_set_alt_local_ack_timeout(req_msg,
1065 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1066 alt_path->packet_life_time));
1067 }
1068
1069 if (param->private_data && param->private_data_len)
1070 memcpy(req_msg->private_data, param->private_data,
1071 param->private_data_len);
1072}
1073
1074static int cm_validate_req_param(struct ib_cm_req_param *param)
1075{
1076 /* peer-to-peer not supported */
1077 if (param->peer_to_peer)
1078 return -EINVAL;
1079
1080 if (!param->primary_path)
1081 return -EINVAL;
1082
1083 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
1084 return -EINVAL;
1085
1086 if (param->private_data &&
1087 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1088 return -EINVAL;
1089
1090 if (param->alternate_path &&
1091 (param->alternate_path->pkey != param->primary_path->pkey ||
1092 param->alternate_path->mtu != param->primary_path->mtu))
1093 return -EINVAL;
1094
1095 return 0;
1096}
1097
1098int ib_send_cm_req(struct ib_cm_id *cm_id,
1099 struct ib_cm_req_param *param)
1100{
1101 struct cm_id_private *cm_id_priv;
1102 struct cm_req_msg *req_msg;
1103 unsigned long flags;
1104 int ret;
1105
1106 ret = cm_validate_req_param(param);
1107 if (ret)
1108 return ret;
1109
1110 /* Verify that we're not in timewait. */
1111 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1112 spin_lock_irqsave(&cm_id_priv->lock, flags);
1113 if (cm_id->state != IB_CM_IDLE) {
1114 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1115 ret = -EINVAL;
1116 goto out;
1117 }
1118 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1119
1120 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1121 id.local_id);
1122 if (IS_ERR(cm_id_priv->timewait_info)) {
1123 ret = PTR_ERR(cm_id_priv->timewait_info);
1124 goto out;
1125 }
1126
1127 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1128 if (ret)
1129 goto error1;
1130 if (param->alternate_path) {
1131 ret = cm_init_av_by_path(param->alternate_path,
1132 &cm_id_priv->alt_av);
1133 if (ret)
1134 goto error1;
1135 }
1136 cm_id->service_id = param->service_id;
1137 cm_id->service_mask = ~cpu_to_be64(0);
1138 cm_id_priv->timeout_ms = cm_convert_to_ms(
1139 param->primary_path->packet_life_time) * 2 +
1140 cm_convert_to_ms(
1141 param->remote_cm_response_timeout);
1142 cm_id_priv->max_cm_retries = param->max_cm_retries;
1143 cm_id_priv->initiator_depth = param->initiator_depth;
1144 cm_id_priv->responder_resources = param->responder_resources;
1145 cm_id_priv->retry_count = param->retry_count;
1146 cm_id_priv->path_mtu = param->primary_path->mtu;
1147 cm_id_priv->pkey = param->primary_path->pkey;
1148 cm_id_priv->qp_type = param->qp_type;
1149
1150 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1151 if (ret)
1152 goto error1;
1153
1154 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1155 cm_format_req(req_msg, cm_id_priv, param);
1156 cm_id_priv->tid = req_msg->hdr.tid;
1157 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1158 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1159
1160 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1161 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1162
1163 spin_lock_irqsave(&cm_id_priv->lock, flags);
1164 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1165 if (ret) {
1166 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1167 goto error2;
1168 }
1169 BUG_ON(cm_id->state != IB_CM_IDLE);
1170 cm_id->state = IB_CM_REQ_SENT;
1171 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1172 return 0;
1173
1174error2: cm_free_msg(cm_id_priv->msg);
1175error1: kfree(cm_id_priv->timewait_info);
1176out: return ret;
1177}
1178EXPORT_SYMBOL(ib_send_cm_req);
1179
1180static int cm_issue_rej(struct cm_port *port,
1181 struct ib_mad_recv_wc *mad_recv_wc,
1182 enum ib_cm_rej_reason reason,
1183 enum cm_msg_response msg_rejected,
1184 void *ari, u8 ari_length)
1185{
1186 struct ib_mad_send_buf *msg = NULL;
1187 struct cm_rej_msg *rej_msg, *rcv_msg;
1188 int ret;
1189
1190 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1191 if (ret)
1192 return ret;
1193
1194 /* We just need common CM header information. Cast to any message. */
1195 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1196 rej_msg = (struct cm_rej_msg *) msg->mad;
1197
1198 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1199 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1200 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1201 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1202 rej_msg->reason = cpu_to_be16(reason);
1203
1204 if (ari && ari_length) {
1205 cm_rej_set_reject_info_len(rej_msg, ari_length);
1206 memcpy(rej_msg->ari, ari, ari_length);
1207 }
1208
1209 ret = ib_post_send_mad(msg, NULL);
1210 if (ret)
1211 cm_free_msg(msg);
1212
1213 return ret;
1214}
1215
1216static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1217 __be32 local_qpn, __be32 remote_qpn)
1218{
1219 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1220 ((local_ca_guid == remote_ca_guid) &&
1221 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1222}
1223
1224static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1225 struct ib_sa_path_rec *primary_path,
1226 struct ib_sa_path_rec *alt_path)
1227{
1228 memset(primary_path, 0, sizeof *primary_path);
1229 primary_path->dgid = req_msg->primary_local_gid;
1230 primary_path->sgid = req_msg->primary_remote_gid;
1231 primary_path->dlid = req_msg->primary_local_lid;
1232 primary_path->slid = req_msg->primary_remote_lid;
1233 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1234 primary_path->hop_limit = req_msg->primary_hop_limit;
1235 primary_path->traffic_class = req_msg->primary_traffic_class;
1236 primary_path->reversible = 1;
1237 primary_path->pkey = req_msg->pkey;
1238 primary_path->sl = cm_req_get_primary_sl(req_msg);
1239 primary_path->mtu_selector = IB_SA_EQ;
1240 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1241 primary_path->rate_selector = IB_SA_EQ;
1242 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1243 primary_path->packet_life_time_selector = IB_SA_EQ;
1244 primary_path->packet_life_time =
1245 cm_req_get_primary_local_ack_timeout(req_msg);
1246 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1247
1248 if (req_msg->alt_local_lid) {
1249 memset(alt_path, 0, sizeof *alt_path);
1250 alt_path->dgid = req_msg->alt_local_gid;
1251 alt_path->sgid = req_msg->alt_remote_gid;
1252 alt_path->dlid = req_msg->alt_local_lid;
1253 alt_path->slid = req_msg->alt_remote_lid;
1254 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1255 alt_path->hop_limit = req_msg->alt_hop_limit;
1256 alt_path->traffic_class = req_msg->alt_traffic_class;
1257 alt_path->reversible = 1;
1258 alt_path->pkey = req_msg->pkey;
1259 alt_path->sl = cm_req_get_alt_sl(req_msg);
1260 alt_path->mtu_selector = IB_SA_EQ;
1261 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1262 alt_path->rate_selector = IB_SA_EQ;
1263 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1264 alt_path->packet_life_time_selector = IB_SA_EQ;
1265 alt_path->packet_life_time =
1266 cm_req_get_alt_local_ack_timeout(req_msg);
1267 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1268 }
1269}
1270
1271static void cm_format_req_event(struct cm_work *work,
1272 struct cm_id_private *cm_id_priv,
1273 struct ib_cm_id *listen_id)
1274{
1275 struct cm_req_msg *req_msg;
1276 struct ib_cm_req_event_param *param;
1277
1278 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1279 param = &work->cm_event.param.req_rcvd;
1280 param->listen_id = listen_id;
1281 param->port = cm_id_priv->av.port->port_num;
1282 param->primary_path = &work->path[0];
1283 if (req_msg->alt_local_lid)
1284 param->alternate_path = &work->path[1];
1285 else
1286 param->alternate_path = NULL;
1287 param->remote_ca_guid = req_msg->local_ca_guid;
1288 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1289 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1290 param->qp_type = cm_req_get_qp_type(req_msg);
1291 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1292 param->responder_resources = cm_req_get_init_depth(req_msg);
1293 param->initiator_depth = cm_req_get_resp_res(req_msg);
1294 param->local_cm_response_timeout =
1295 cm_req_get_remote_resp_timeout(req_msg);
1296 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1297 param->remote_cm_response_timeout =
1298 cm_req_get_local_resp_timeout(req_msg);
1299 param->retry_count = cm_req_get_retry_count(req_msg);
1300 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1301 param->srq = cm_req_get_srq(req_msg);
1302 work->cm_event.private_data = &req_msg->private_data;
1303}
1304
1305static void cm_process_work(struct cm_id_private *cm_id_priv,
1306 struct cm_work *work)
1307{
1308 int ret;
1309
1310 /* We will typically only have the current event to report. */
1311 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1312 cm_free_work(work);
1313
1314 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1315 spin_lock_irq(&cm_id_priv->lock);
1316 work = cm_dequeue_work(cm_id_priv);
1317 spin_unlock_irq(&cm_id_priv->lock);
1318 BUG_ON(!work);
1319 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1320 &work->cm_event);
1321 cm_free_work(work);
1322 }
1323 cm_deref_id(cm_id_priv);
1324 if (ret)
1325 cm_destroy_id(&cm_id_priv->id, ret);
1326}
1327
1328static void cm_format_mra(struct cm_mra_msg *mra_msg,
1329 struct cm_id_private *cm_id_priv,
1330 enum cm_msg_response msg_mraed, u8 service_timeout,
1331 const void *private_data, u8 private_data_len)
1332{
1333 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1334 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1335 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1336 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1337 cm_mra_set_service_timeout(mra_msg, service_timeout);
1338
1339 if (private_data && private_data_len)
1340 memcpy(mra_msg->private_data, private_data, private_data_len);
1341}
1342
1343static void cm_format_rej(struct cm_rej_msg *rej_msg,
1344 struct cm_id_private *cm_id_priv,
1345 enum ib_cm_rej_reason reason,
1346 void *ari,
1347 u8 ari_length,
1348 const void *private_data,
1349 u8 private_data_len)
1350{
1351 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1352 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1353
1354 switch(cm_id_priv->id.state) {
1355 case IB_CM_REQ_RCVD:
1356 rej_msg->local_comm_id = 0;
1357 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1358 break;
1359 case IB_CM_MRA_REQ_SENT:
1360 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1361 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1362 break;
1363 case IB_CM_REP_RCVD:
1364 case IB_CM_MRA_REP_SENT:
1365 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1366 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1367 break;
1368 default:
1369 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1370 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1371 break;
1372 }
1373
1374 rej_msg->reason = cpu_to_be16(reason);
1375 if (ari && ari_length) {
1376 cm_rej_set_reject_info_len(rej_msg, ari_length);
1377 memcpy(rej_msg->ari, ari, ari_length);
1378 }
1379
1380 if (private_data && private_data_len)
1381 memcpy(rej_msg->private_data, private_data, private_data_len);
1382}
1383
1384static void cm_dup_req_handler(struct cm_work *work,
1385 struct cm_id_private *cm_id_priv)
1386{
1387 struct ib_mad_send_buf *msg = NULL;
1388 int ret;
1389
1390 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1391 counter[CM_REQ_COUNTER]);
1392
1393 /* Quick state check to discard duplicate REQs. */
1394 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1395 return;
1396
1397 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1398 if (ret)
1399 return;
1400
1401 spin_lock_irq(&cm_id_priv->lock);
1402 switch (cm_id_priv->id.state) {
1403 case IB_CM_MRA_REQ_SENT:
1404 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1405 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1406 cm_id_priv->private_data,
1407 cm_id_priv->private_data_len);
1408 break;
1409 case IB_CM_TIMEWAIT:
1410 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1411 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1412 break;
1413 default:
1414 goto unlock;
1415 }
1416 spin_unlock_irq(&cm_id_priv->lock);
1417
1418 ret = ib_post_send_mad(msg, NULL);
1419 if (ret)
1420 goto free;
1421 return;
1422
1423unlock: spin_unlock_irq(&cm_id_priv->lock);
1424free: cm_free_msg(msg);
1425}
1426
1427static struct cm_id_private * cm_match_req(struct cm_work *work,
1428 struct cm_id_private *cm_id_priv)
1429{
1430 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1431 struct cm_timewait_info *timewait_info;
1432 struct cm_req_msg *req_msg;
1433
1434 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1435
1436 /* Check for possible duplicate REQ. */
1437 spin_lock_irq(&cm.lock);
1438 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1439 if (timewait_info) {
1440 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1441 timewait_info->work.remote_id);
1442 spin_unlock_irq(&cm.lock);
1443 if (cur_cm_id_priv) {
1444 cm_dup_req_handler(work, cur_cm_id_priv);
1445 cm_deref_id(cur_cm_id_priv);
1446 }
1447 return NULL;
1448 }
1449
1450 /* Check for stale connections. */
1451 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1452 if (timewait_info) {
1453 cm_cleanup_timewait(cm_id_priv->timewait_info);
1454 spin_unlock_irq(&cm.lock);
1455 cm_issue_rej(work->port, work->mad_recv_wc,
1456 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1457 NULL, 0);
1458 return NULL;
1459 }
1460
1461 /* Find matching listen request. */
1462 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1463 req_msg->service_id,
1464 req_msg->private_data);
1465 if (!listen_cm_id_priv) {
1466 cm_cleanup_timewait(cm_id_priv->timewait_info);
1467 spin_unlock_irq(&cm.lock);
1468 cm_issue_rej(work->port, work->mad_recv_wc,
1469 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1470 NULL, 0);
1471 goto out;
1472 }
1473 atomic_inc(&listen_cm_id_priv->refcount);
1474 atomic_inc(&cm_id_priv->refcount);
1475 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1476 atomic_inc(&cm_id_priv->work_count);
1477 spin_unlock_irq(&cm.lock);
1478out:
1479 return listen_cm_id_priv;
1480}
1481
1482/*
1483 * Work-around for inter-subnet connections. If the LIDs are permissive,
1484 * we need to override the LID/SL data in the REQ with the LID information
1485 * in the work completion.
1486 */
1487static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1488{
1489 if (!cm_req_get_primary_subnet_local(req_msg)) {
1490 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1491 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1492 cm_req_set_primary_sl(req_msg, wc->sl);
1493 }
1494
1495 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1496 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1497 }
1498
1499 if (!cm_req_get_alt_subnet_local(req_msg)) {
1500 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1501 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1502 cm_req_set_alt_sl(req_msg, wc->sl);
1503 }
1504
1505 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1506 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1507 }
1508}
1509
1510static int cm_req_handler(struct cm_work *work)
1511{
1512 struct ib_cm_id *cm_id;
1513 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1514 struct cm_req_msg *req_msg;
1515 int ret;
1516
1517 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1518
1519 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1520 if (IS_ERR(cm_id))
1521 return PTR_ERR(cm_id);
1522
1523 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1524 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1525 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1526 work->mad_recv_wc->recv_buf.grh,
1527 &cm_id_priv->av);
1528 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1529 id.local_id);
1530 if (IS_ERR(cm_id_priv->timewait_info)) {
1531 ret = PTR_ERR(cm_id_priv->timewait_info);
1532 goto destroy;
1533 }
1534 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1535 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1536 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1537
1538 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1539 if (!listen_cm_id_priv) {
1540 ret = -EINVAL;
1541 kfree(cm_id_priv->timewait_info);
1542 goto destroy;
1543 }
1544
1545 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1546 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1547 cm_id_priv->id.service_id = req_msg->service_id;
1548 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1549
1550 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1551 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1552 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1553 if (ret) {
1554 ib_get_cached_gid(work->port->cm_dev->ib_device,
1555 work->port->port_num, 0, &work->path[0].sgid);
1556 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1557 &work->path[0].sgid, sizeof work->path[0].sgid,
1558 NULL, 0);
1559 goto rejected;
1560 }
1561 if (req_msg->alt_local_lid) {
1562 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1563 if (ret) {
1564 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1565 &work->path[0].sgid,
1566 sizeof work->path[0].sgid, NULL, 0);
1567 goto rejected;
1568 }
1569 }
1570 cm_id_priv->tid = req_msg->hdr.tid;
1571 cm_id_priv->timeout_ms = cm_convert_to_ms(
1572 cm_req_get_local_resp_timeout(req_msg));
1573 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1574 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1575 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1576 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1577 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1578 cm_id_priv->pkey = req_msg->pkey;
1579 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1580 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1581 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1582 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1583
1584 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1585 cm_process_work(cm_id_priv, work);
1586 cm_deref_id(listen_cm_id_priv);
1587 return 0;
1588
1589rejected:
1590 atomic_dec(&cm_id_priv->refcount);
1591 cm_deref_id(listen_cm_id_priv);
1592destroy:
1593 ib_destroy_cm_id(cm_id);
1594 return ret;
1595}
1596
1597static void cm_format_rep(struct cm_rep_msg *rep_msg,
1598 struct cm_id_private *cm_id_priv,
1599 struct ib_cm_rep_param *param)
1600{
1601 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1602 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1603 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1604 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1605 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1606 rep_msg->resp_resources = param->responder_resources;
1607 rep_msg->initiator_depth = param->initiator_depth;
1608 cm_rep_set_target_ack_delay(rep_msg,
1609 cm_id_priv->av.port->cm_dev->ack_delay);
1610 cm_rep_set_failover(rep_msg, param->failover_accepted);
1611 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1612 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1613 cm_rep_set_srq(rep_msg, param->srq);
1614 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1615
1616 if (param->private_data && param->private_data_len)
1617 memcpy(rep_msg->private_data, param->private_data,
1618 param->private_data_len);
1619}
1620
1621int ib_send_cm_rep(struct ib_cm_id *cm_id,
1622 struct ib_cm_rep_param *param)
1623{
1624 struct cm_id_private *cm_id_priv;
1625 struct ib_mad_send_buf *msg;
1626 struct cm_rep_msg *rep_msg;
1627 unsigned long flags;
1628 int ret;
1629
1630 if (param->private_data &&
1631 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1632 return -EINVAL;
1633
1634 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1635 spin_lock_irqsave(&cm_id_priv->lock, flags);
1636 if (cm_id->state != IB_CM_REQ_RCVD &&
1637 cm_id->state != IB_CM_MRA_REQ_SENT) {
1638 ret = -EINVAL;
1639 goto out;
1640 }
1641
1642 ret = cm_alloc_msg(cm_id_priv, &msg);
1643 if (ret)
1644 goto out;
1645
1646 rep_msg = (struct cm_rep_msg *) msg->mad;
1647 cm_format_rep(rep_msg, cm_id_priv, param);
1648 msg->timeout_ms = cm_id_priv->timeout_ms;
1649 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1650
1651 ret = ib_post_send_mad(msg, NULL);
1652 if (ret) {
1653 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1654 cm_free_msg(msg);
1655 return ret;
1656 }
1657
1658 cm_id->state = IB_CM_REP_SENT;
1659 cm_id_priv->msg = msg;
1660 cm_id_priv->initiator_depth = param->initiator_depth;
1661 cm_id_priv->responder_resources = param->responder_resources;
1662 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1663 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1664
1665out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1666 return ret;
1667}
1668EXPORT_SYMBOL(ib_send_cm_rep);
1669
1670static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1671 struct cm_id_private *cm_id_priv,
1672 const void *private_data,
1673 u8 private_data_len)
1674{
1675 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1676 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1677 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1678
1679 if (private_data && private_data_len)
1680 memcpy(rtu_msg->private_data, private_data, private_data_len);
1681}
1682
1683int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1684 const void *private_data,
1685 u8 private_data_len)
1686{
1687 struct cm_id_private *cm_id_priv;
1688 struct ib_mad_send_buf *msg;
1689 unsigned long flags;
1690 void *data;
1691 int ret;
1692
1693 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1694 return -EINVAL;
1695
1696 data = cm_copy_private_data(private_data, private_data_len);
1697 if (IS_ERR(data))
1698 return PTR_ERR(data);
1699
1700 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1701 spin_lock_irqsave(&cm_id_priv->lock, flags);
1702 if (cm_id->state != IB_CM_REP_RCVD &&
1703 cm_id->state != IB_CM_MRA_REP_SENT) {
1704 ret = -EINVAL;
1705 goto error;
1706 }
1707
1708 ret = cm_alloc_msg(cm_id_priv, &msg);
1709 if (ret)
1710 goto error;
1711
1712 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1713 private_data, private_data_len);
1714
1715 ret = ib_post_send_mad(msg, NULL);
1716 if (ret) {
1717 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1718 cm_free_msg(msg);
1719 kfree(data);
1720 return ret;
1721 }
1722
1723 cm_id->state = IB_CM_ESTABLISHED;
1724 cm_set_private_data(cm_id_priv, data, private_data_len);
1725 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1726 return 0;
1727
1728error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1729 kfree(data);
1730 return ret;
1731}
1732EXPORT_SYMBOL(ib_send_cm_rtu);
1733
1734static void cm_format_rep_event(struct cm_work *work)
1735{
1736 struct cm_rep_msg *rep_msg;
1737 struct ib_cm_rep_event_param *param;
1738
1739 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1740 param = &work->cm_event.param.rep_rcvd;
1741 param->remote_ca_guid = rep_msg->local_ca_guid;
1742 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1743 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1744 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1745 param->responder_resources = rep_msg->initiator_depth;
1746 param->initiator_depth = rep_msg->resp_resources;
1747 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1748 param->failover_accepted = cm_rep_get_failover(rep_msg);
1749 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1750 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1751 param->srq = cm_rep_get_srq(rep_msg);
1752 work->cm_event.private_data = &rep_msg->private_data;
1753}
1754
1755static void cm_dup_rep_handler(struct cm_work *work)
1756{
1757 struct cm_id_private *cm_id_priv;
1758 struct cm_rep_msg *rep_msg;
1759 struct ib_mad_send_buf *msg = NULL;
1760 int ret;
1761
1762 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1763 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1764 rep_msg->local_comm_id);
1765 if (!cm_id_priv)
1766 return;
1767
1768 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1769 counter[CM_REP_COUNTER]);
1770 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1771 if (ret)
1772 goto deref;
1773
1774 spin_lock_irq(&cm_id_priv->lock);
1775 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1776 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1777 cm_id_priv->private_data,
1778 cm_id_priv->private_data_len);
1779 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1780 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1781 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1782 cm_id_priv->private_data,
1783 cm_id_priv->private_data_len);
1784 else
1785 goto unlock;
1786 spin_unlock_irq(&cm_id_priv->lock);
1787
1788 ret = ib_post_send_mad(msg, NULL);
1789 if (ret)
1790 goto free;
1791 goto deref;
1792
1793unlock: spin_unlock_irq(&cm_id_priv->lock);
1794free: cm_free_msg(msg);
1795deref: cm_deref_id(cm_id_priv);
1796}
1797
1798static int cm_rep_handler(struct cm_work *work)
1799{
1800 struct cm_id_private *cm_id_priv;
1801 struct cm_rep_msg *rep_msg;
1802 int ret;
1803
1804 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1805 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1806 if (!cm_id_priv) {
1807 cm_dup_rep_handler(work);
1808 return -EINVAL;
1809 }
1810
1811 cm_format_rep_event(work);
1812
1813 spin_lock_irq(&cm_id_priv->lock);
1814 switch (cm_id_priv->id.state) {
1815 case IB_CM_REQ_SENT:
1816 case IB_CM_MRA_REQ_RCVD:
1817 break;
1818 default:
1819 spin_unlock_irq(&cm_id_priv->lock);
1820 ret = -EINVAL;
1821 goto error;
1822 }
1823
1824 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1825 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1826 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1827
1828 spin_lock(&cm.lock);
1829 /* Check for duplicate REP. */
1830 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1831 spin_unlock(&cm.lock);
1832 spin_unlock_irq(&cm_id_priv->lock);
1833 ret = -EINVAL;
1834 goto error;
1835 }
1836 /* Check for a stale connection. */
1837 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1838 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1839 &cm.remote_id_table);
1840 cm_id_priv->timewait_info->inserted_remote_id = 0;
1841 spin_unlock(&cm.lock);
1842 spin_unlock_irq(&cm_id_priv->lock);
1843 cm_issue_rej(work->port, work->mad_recv_wc,
1844 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1845 NULL, 0);
1846 ret = -EINVAL;
1847 goto error;
1848 }
1849 spin_unlock(&cm.lock);
1850
1851 cm_id_priv->id.state = IB_CM_REP_RCVD;
1852 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1853 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1854 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1855 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1856 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1857 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1858 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1859 cm_id_priv->av.timeout =
1860 cm_ack_timeout(cm_id_priv->target_ack_delay,
1861 cm_id_priv->av.timeout - 1);
1862 cm_id_priv->alt_av.timeout =
1863 cm_ack_timeout(cm_id_priv->target_ack_delay,
1864 cm_id_priv->alt_av.timeout - 1);
1865
1866 /* todo: handle peer_to_peer */
1867
1868 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1869 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1870 if (!ret)
1871 list_add_tail(&work->list, &cm_id_priv->work_list);
1872 spin_unlock_irq(&cm_id_priv->lock);
1873
1874 if (ret)
1875 cm_process_work(cm_id_priv, work);
1876 else
1877 cm_deref_id(cm_id_priv);
1878 return 0;
1879
1880error:
1881 cm_deref_id(cm_id_priv);
1882 return ret;
1883}
1884
1885static int cm_establish_handler(struct cm_work *work)
1886{
1887 struct cm_id_private *cm_id_priv;
1888 int ret;
1889
1890 /* See comment in cm_establish about lookup. */
1891 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1892 if (!cm_id_priv)
1893 return -EINVAL;
1894
1895 spin_lock_irq(&cm_id_priv->lock);
1896 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1897 spin_unlock_irq(&cm_id_priv->lock);
1898 goto out;
1899 }
1900
1901 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1902 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1903 if (!ret)
1904 list_add_tail(&work->list, &cm_id_priv->work_list);
1905 spin_unlock_irq(&cm_id_priv->lock);
1906
1907 if (ret)
1908 cm_process_work(cm_id_priv, work);
1909 else
1910 cm_deref_id(cm_id_priv);
1911 return 0;
1912out:
1913 cm_deref_id(cm_id_priv);
1914 return -EINVAL;
1915}
1916
1917static int cm_rtu_handler(struct cm_work *work)
1918{
1919 struct cm_id_private *cm_id_priv;
1920 struct cm_rtu_msg *rtu_msg;
1921 int ret;
1922
1923 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1924 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1925 rtu_msg->local_comm_id);
1926 if (!cm_id_priv)
1927 return -EINVAL;
1928
1929 work->cm_event.private_data = &rtu_msg->private_data;
1930
1931 spin_lock_irq(&cm_id_priv->lock);
1932 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1933 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1934 spin_unlock_irq(&cm_id_priv->lock);
1935 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1936 counter[CM_RTU_COUNTER]);
1937 goto out;
1938 }
1939 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1940
1941 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1942 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1943 if (!ret)
1944 list_add_tail(&work->list, &cm_id_priv->work_list);
1945 spin_unlock_irq(&cm_id_priv->lock);
1946
1947 if (ret)
1948 cm_process_work(cm_id_priv, work);
1949 else
1950 cm_deref_id(cm_id_priv);
1951 return 0;
1952out:
1953 cm_deref_id(cm_id_priv);
1954 return -EINVAL;
1955}
1956
1957static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1958 struct cm_id_private *cm_id_priv,
1959 const void *private_data,
1960 u8 private_data_len)
1961{
1962 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1963 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1964 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1965 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1966 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1967
1968 if (private_data && private_data_len)
1969 memcpy(dreq_msg->private_data, private_data, private_data_len);
1970}
1971
1972int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1973 const void *private_data,
1974 u8 private_data_len)
1975{
1976 struct cm_id_private *cm_id_priv;
1977 struct ib_mad_send_buf *msg;
1978 unsigned long flags;
1979 int ret;
1980
1981 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1982 return -EINVAL;
1983
1984 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1985 spin_lock_irqsave(&cm_id_priv->lock, flags);
1986 if (cm_id->state != IB_CM_ESTABLISHED) {
1987 ret = -EINVAL;
1988 goto out;
1989 }
1990
1991 if (cm_id->lap_state == IB_CM_LAP_SENT ||
1992 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
1993 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1994
1995 ret = cm_alloc_msg(cm_id_priv, &msg);
1996 if (ret) {
1997 cm_enter_timewait(cm_id_priv);
1998 goto out;
1999 }
2000
2001 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2002 private_data, private_data_len);
2003 msg->timeout_ms = cm_id_priv->timeout_ms;
2004 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2005
2006 ret = ib_post_send_mad(msg, NULL);
2007 if (ret) {
2008 cm_enter_timewait(cm_id_priv);
2009 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2010 cm_free_msg(msg);
2011 return ret;
2012 }
2013
2014 cm_id->state = IB_CM_DREQ_SENT;
2015 cm_id_priv->msg = msg;
2016out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2017 return ret;
2018}
2019EXPORT_SYMBOL(ib_send_cm_dreq);
2020
2021static void cm_format_drep(struct cm_drep_msg *drep_msg,
2022 struct cm_id_private *cm_id_priv,
2023 const void *private_data,
2024 u8 private_data_len)
2025{
2026 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2027 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2028 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2029
2030 if (private_data && private_data_len)
2031 memcpy(drep_msg->private_data, private_data, private_data_len);
2032}
2033
2034int ib_send_cm_drep(struct ib_cm_id *cm_id,
2035 const void *private_data,
2036 u8 private_data_len)
2037{
2038 struct cm_id_private *cm_id_priv;
2039 struct ib_mad_send_buf *msg;
2040 unsigned long flags;
2041 void *data;
2042 int ret;
2043
2044 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2045 return -EINVAL;
2046
2047 data = cm_copy_private_data(private_data, private_data_len);
2048 if (IS_ERR(data))
2049 return PTR_ERR(data);
2050
2051 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2052 spin_lock_irqsave(&cm_id_priv->lock, flags);
2053 if (cm_id->state != IB_CM_DREQ_RCVD) {
2054 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2055 kfree(data);
2056 return -EINVAL;
2057 }
2058
2059 cm_set_private_data(cm_id_priv, data, private_data_len);
2060 cm_enter_timewait(cm_id_priv);
2061
2062 ret = cm_alloc_msg(cm_id_priv, &msg);
2063 if (ret)
2064 goto out;
2065
2066 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2067 private_data, private_data_len);
2068
2069 ret = ib_post_send_mad(msg, NULL);
2070 if (ret) {
2071 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2072 cm_free_msg(msg);
2073 return ret;
2074 }
2075
2076out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2077 return ret;
2078}
2079EXPORT_SYMBOL(ib_send_cm_drep);
2080
2081static int cm_issue_drep(struct cm_port *port,
2082 struct ib_mad_recv_wc *mad_recv_wc)
2083{
2084 struct ib_mad_send_buf *msg = NULL;
2085 struct cm_dreq_msg *dreq_msg;
2086 struct cm_drep_msg *drep_msg;
2087 int ret;
2088
2089 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2090 if (ret)
2091 return ret;
2092
2093 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2094 drep_msg = (struct cm_drep_msg *) msg->mad;
2095
2096 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2097 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2098 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2099
2100 ret = ib_post_send_mad(msg, NULL);
2101 if (ret)
2102 cm_free_msg(msg);
2103
2104 return ret;
2105}
2106
2107static int cm_dreq_handler(struct cm_work *work)
2108{
2109 struct cm_id_private *cm_id_priv;
2110 struct cm_dreq_msg *dreq_msg;
2111 struct ib_mad_send_buf *msg = NULL;
2112 int ret;
2113
2114 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2115 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2116 dreq_msg->local_comm_id);
2117 if (!cm_id_priv) {
2118 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2119 counter[CM_DREQ_COUNTER]);
2120 cm_issue_drep(work->port, work->mad_recv_wc);
2121 return -EINVAL;
2122 }
2123
2124 work->cm_event.private_data = &dreq_msg->private_data;
2125
2126 spin_lock_irq(&cm_id_priv->lock);
2127 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2128 goto unlock;
2129
2130 switch (cm_id_priv->id.state) {
2131 case IB_CM_REP_SENT:
2132 case IB_CM_DREQ_SENT:
2133 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2134 break;
2135 case IB_CM_ESTABLISHED:
2136 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2137 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2138 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2139 break;
2140 case IB_CM_MRA_REP_RCVD:
2141 break;
2142 case IB_CM_TIMEWAIT:
2143 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2144 counter[CM_DREQ_COUNTER]);
2145 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2146 goto unlock;
2147
2148 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2149 cm_id_priv->private_data,
2150 cm_id_priv->private_data_len);
2151 spin_unlock_irq(&cm_id_priv->lock);
2152
2153 if (ib_post_send_mad(msg, NULL))
2154 cm_free_msg(msg);
2155 goto deref;
2156 case IB_CM_DREQ_RCVD:
2157 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2158 counter[CM_DREQ_COUNTER]);
2159 goto unlock;
2160 default:
2161 goto unlock;
2162 }
2163 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2164 cm_id_priv->tid = dreq_msg->hdr.tid;
2165 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2166 if (!ret)
2167 list_add_tail(&work->list, &cm_id_priv->work_list);
2168 spin_unlock_irq(&cm_id_priv->lock);
2169
2170 if (ret)
2171 cm_process_work(cm_id_priv, work);
2172 else
2173 cm_deref_id(cm_id_priv);
2174 return 0;
2175
2176unlock: spin_unlock_irq(&cm_id_priv->lock);
2177deref: cm_deref_id(cm_id_priv);
2178 return -EINVAL;
2179}
2180
2181static int cm_drep_handler(struct cm_work *work)
2182{
2183 struct cm_id_private *cm_id_priv;
2184 struct cm_drep_msg *drep_msg;
2185 int ret;
2186
2187 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2188 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2189 drep_msg->local_comm_id);
2190 if (!cm_id_priv)
2191 return -EINVAL;
2192
2193 work->cm_event.private_data = &drep_msg->private_data;
2194
2195 spin_lock_irq(&cm_id_priv->lock);
2196 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2197 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2198 spin_unlock_irq(&cm_id_priv->lock);
2199 goto out;
2200 }
2201 cm_enter_timewait(cm_id_priv);
2202
2203 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2204 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2205 if (!ret)
2206 list_add_tail(&work->list, &cm_id_priv->work_list);
2207 spin_unlock_irq(&cm_id_priv->lock);
2208
2209 if (ret)
2210 cm_process_work(cm_id_priv, work);
2211 else
2212 cm_deref_id(cm_id_priv);
2213 return 0;
2214out:
2215 cm_deref_id(cm_id_priv);
2216 return -EINVAL;
2217}
2218
2219int ib_send_cm_rej(struct ib_cm_id *cm_id,
2220 enum ib_cm_rej_reason reason,
2221 void *ari,
2222 u8 ari_length,
2223 const void *private_data,
2224 u8 private_data_len)
2225{
2226 struct cm_id_private *cm_id_priv;
2227 struct ib_mad_send_buf *msg;
2228 unsigned long flags;
2229 int ret;
2230
2231 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2232 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2233 return -EINVAL;
2234
2235 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2236
2237 spin_lock_irqsave(&cm_id_priv->lock, flags);
2238 switch (cm_id->state) {
2239 case IB_CM_REQ_SENT:
2240 case IB_CM_MRA_REQ_RCVD:
2241 case IB_CM_REQ_RCVD:
2242 case IB_CM_MRA_REQ_SENT:
2243 case IB_CM_REP_RCVD:
2244 case IB_CM_MRA_REP_SENT:
2245 ret = cm_alloc_msg(cm_id_priv, &msg);
2246 if (!ret)
2247 cm_format_rej((struct cm_rej_msg *) msg->mad,
2248 cm_id_priv, reason, ari, ari_length,
2249 private_data, private_data_len);
2250
2251 cm_reset_to_idle(cm_id_priv);
2252 break;
2253 case IB_CM_REP_SENT:
2254 case IB_CM_MRA_REP_RCVD:
2255 ret = cm_alloc_msg(cm_id_priv, &msg);
2256 if (!ret)
2257 cm_format_rej((struct cm_rej_msg *) msg->mad,
2258 cm_id_priv, reason, ari, ari_length,
2259 private_data, private_data_len);
2260
2261 cm_enter_timewait(cm_id_priv);
2262 break;
2263 default:
2264 ret = -EINVAL;
2265 goto out;
2266 }
2267
2268 if (ret)
2269 goto out;
2270
2271 ret = ib_post_send_mad(msg, NULL);
2272 if (ret)
2273 cm_free_msg(msg);
2274
2275out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2276 return ret;
2277}
2278EXPORT_SYMBOL(ib_send_cm_rej);
2279
2280static void cm_format_rej_event(struct cm_work *work)
2281{
2282 struct cm_rej_msg *rej_msg;
2283 struct ib_cm_rej_event_param *param;
2284
2285 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2286 param = &work->cm_event.param.rej_rcvd;
2287 param->ari = rej_msg->ari;
2288 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2289 param->reason = __be16_to_cpu(rej_msg->reason);
2290 work->cm_event.private_data = &rej_msg->private_data;
2291}
2292
2293static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2294{
2295 struct cm_timewait_info *timewait_info;
2296 struct cm_id_private *cm_id_priv;
2297 __be32 remote_id;
2298
2299 remote_id = rej_msg->local_comm_id;
2300
2301 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2302 spin_lock_irq(&cm.lock);
2303 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2304 remote_id);
2305 if (!timewait_info) {
2306 spin_unlock_irq(&cm.lock);
2307 return NULL;
2308 }
2309 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2310 (timewait_info->work.local_id ^
2311 cm.random_id_operand));
2312 if (cm_id_priv) {
2313 if (cm_id_priv->id.remote_id == remote_id)
2314 atomic_inc(&cm_id_priv->refcount);
2315 else
2316 cm_id_priv = NULL;
2317 }
2318 spin_unlock_irq(&cm.lock);
2319 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2320 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2321 else
2322 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2323
2324 return cm_id_priv;
2325}
2326
2327static int cm_rej_handler(struct cm_work *work)
2328{
2329 struct cm_id_private *cm_id_priv;
2330 struct cm_rej_msg *rej_msg;
2331 int ret;
2332
2333 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2334 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2335 if (!cm_id_priv)
2336 return -EINVAL;
2337
2338 cm_format_rej_event(work);
2339
2340 spin_lock_irq(&cm_id_priv->lock);
2341 switch (cm_id_priv->id.state) {
2342 case IB_CM_REQ_SENT:
2343 case IB_CM_MRA_REQ_RCVD:
2344 case IB_CM_REP_SENT:
2345 case IB_CM_MRA_REP_RCVD:
2346 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2347 /* fall through */
2348 case IB_CM_REQ_RCVD:
2349 case IB_CM_MRA_REQ_SENT:
2350 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2351 cm_enter_timewait(cm_id_priv);
2352 else
2353 cm_reset_to_idle(cm_id_priv);
2354 break;
2355 case IB_CM_DREQ_SENT:
2356 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2357 /* fall through */
2358 case IB_CM_REP_RCVD:
2359 case IB_CM_MRA_REP_SENT:
2360 cm_enter_timewait(cm_id_priv);
2361 break;
2362 case IB_CM_ESTABLISHED:
2363 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2364 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2365 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2366 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2367 cm_id_priv->msg);
2368 cm_enter_timewait(cm_id_priv);
2369 break;
2370 }
2371 /* fall through */
2372 default:
2373 spin_unlock_irq(&cm_id_priv->lock);
2374 ret = -EINVAL;
2375 goto out;
2376 }
2377
2378 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2379 if (!ret)
2380 list_add_tail(&work->list, &cm_id_priv->work_list);
2381 spin_unlock_irq(&cm_id_priv->lock);
2382
2383 if (ret)
2384 cm_process_work(cm_id_priv, work);
2385 else
2386 cm_deref_id(cm_id_priv);
2387 return 0;
2388out:
2389 cm_deref_id(cm_id_priv);
2390 return -EINVAL;
2391}
2392
2393int ib_send_cm_mra(struct ib_cm_id *cm_id,
2394 u8 service_timeout,
2395 const void *private_data,
2396 u8 private_data_len)
2397{
2398 struct cm_id_private *cm_id_priv;
2399 struct ib_mad_send_buf *msg;
2400 enum ib_cm_state cm_state;
2401 enum ib_cm_lap_state lap_state;
2402 enum cm_msg_response msg_response;
2403 void *data;
2404 unsigned long flags;
2405 int ret;
2406
2407 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2408 return -EINVAL;
2409
2410 data = cm_copy_private_data(private_data, private_data_len);
2411 if (IS_ERR(data))
2412 return PTR_ERR(data);
2413
2414 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2415
2416 spin_lock_irqsave(&cm_id_priv->lock, flags);
2417 switch(cm_id_priv->id.state) {
2418 case IB_CM_REQ_RCVD:
2419 cm_state = IB_CM_MRA_REQ_SENT;
2420 lap_state = cm_id->lap_state;
2421 msg_response = CM_MSG_RESPONSE_REQ;
2422 break;
2423 case IB_CM_REP_RCVD:
2424 cm_state = IB_CM_MRA_REP_SENT;
2425 lap_state = cm_id->lap_state;
2426 msg_response = CM_MSG_RESPONSE_REP;
2427 break;
2428 case IB_CM_ESTABLISHED:
2429 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2430 cm_state = cm_id->state;
2431 lap_state = IB_CM_MRA_LAP_SENT;
2432 msg_response = CM_MSG_RESPONSE_OTHER;
2433 break;
2434 }
2435 default:
2436 ret = -EINVAL;
2437 goto error1;
2438 }
2439
2440 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2441 ret = cm_alloc_msg(cm_id_priv, &msg);
2442 if (ret)
2443 goto error1;
2444
2445 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2446 msg_response, service_timeout,
2447 private_data, private_data_len);
2448 ret = ib_post_send_mad(msg, NULL);
2449 if (ret)
2450 goto error2;
2451 }
2452
2453 cm_id->state = cm_state;
2454 cm_id->lap_state = lap_state;
2455 cm_id_priv->service_timeout = service_timeout;
2456 cm_set_private_data(cm_id_priv, data, private_data_len);
2457 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2458 return 0;
2459
2460error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2461 kfree(data);
2462 return ret;
2463
2464error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2465 kfree(data);
2466 cm_free_msg(msg);
2467 return ret;
2468}
2469EXPORT_SYMBOL(ib_send_cm_mra);
2470
2471static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2472{
2473 switch (cm_mra_get_msg_mraed(mra_msg)) {
2474 case CM_MSG_RESPONSE_REQ:
2475 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2476 case CM_MSG_RESPONSE_REP:
2477 case CM_MSG_RESPONSE_OTHER:
2478 return cm_acquire_id(mra_msg->remote_comm_id,
2479 mra_msg->local_comm_id);
2480 default:
2481 return NULL;
2482 }
2483}
2484
2485static int cm_mra_handler(struct cm_work *work)
2486{
2487 struct cm_id_private *cm_id_priv;
2488 struct cm_mra_msg *mra_msg;
2489 int timeout, ret;
2490
2491 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2492 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2493 if (!cm_id_priv)
2494 return -EINVAL;
2495
2496 work->cm_event.private_data = &mra_msg->private_data;
2497 work->cm_event.param.mra_rcvd.service_timeout =
2498 cm_mra_get_service_timeout(mra_msg);
2499 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2500 cm_convert_to_ms(cm_id_priv->av.timeout);
2501
2502 spin_lock_irq(&cm_id_priv->lock);
2503 switch (cm_id_priv->id.state) {
2504 case IB_CM_REQ_SENT:
2505 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2506 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2507 cm_id_priv->msg, timeout))
2508 goto out;
2509 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2510 break;
2511 case IB_CM_REP_SENT:
2512 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2513 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2514 cm_id_priv->msg, timeout))
2515 goto out;
2516 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2517 break;
2518 case IB_CM_ESTABLISHED:
2519 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2520 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2521 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2522 cm_id_priv->msg, timeout)) {
2523 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2524 atomic_long_inc(&work->port->
2525 counter_group[CM_RECV_DUPLICATES].
2526 counter[CM_MRA_COUNTER]);
2527 goto out;
2528 }
2529 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2530 break;
2531 case IB_CM_MRA_REQ_RCVD:
2532 case IB_CM_MRA_REP_RCVD:
2533 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2534 counter[CM_MRA_COUNTER]);
2535 /* fall through */
2536 default:
2537 goto out;
2538 }
2539
2540 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2541 cm_id_priv->id.state;
2542 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2543 if (!ret)
2544 list_add_tail(&work->list, &cm_id_priv->work_list);
2545 spin_unlock_irq(&cm_id_priv->lock);
2546
2547 if (ret)
2548 cm_process_work(cm_id_priv, work);
2549 else
2550 cm_deref_id(cm_id_priv);
2551 return 0;
2552out:
2553 spin_unlock_irq(&cm_id_priv->lock);
2554 cm_deref_id(cm_id_priv);
2555 return -EINVAL;
2556}
2557
2558static void cm_format_lap(struct cm_lap_msg *lap_msg,
2559 struct cm_id_private *cm_id_priv,
2560 struct ib_sa_path_rec *alternate_path,
2561 const void *private_data,
2562 u8 private_data_len)
2563{
2564 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2565 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2566 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2567 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2568 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2569 /* todo: need remote CM response timeout */
2570 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2571 lap_msg->alt_local_lid = alternate_path->slid;
2572 lap_msg->alt_remote_lid = alternate_path->dlid;
2573 lap_msg->alt_local_gid = alternate_path->sgid;
2574 lap_msg->alt_remote_gid = alternate_path->dgid;
2575 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2576 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2577 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2578 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2579 cm_lap_set_sl(lap_msg, alternate_path->sl);
2580 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2581 cm_lap_set_local_ack_timeout(lap_msg,
2582 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2583 alternate_path->packet_life_time));
2584
2585 if (private_data && private_data_len)
2586 memcpy(lap_msg->private_data, private_data, private_data_len);
2587}
2588
2589int ib_send_cm_lap(struct ib_cm_id *cm_id,
2590 struct ib_sa_path_rec *alternate_path,
2591 const void *private_data,
2592 u8 private_data_len)
2593{
2594 struct cm_id_private *cm_id_priv;
2595 struct ib_mad_send_buf *msg;
2596 unsigned long flags;
2597 int ret;
2598
2599 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2600 return -EINVAL;
2601
2602 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2603 spin_lock_irqsave(&cm_id_priv->lock, flags);
2604 if (cm_id->state != IB_CM_ESTABLISHED ||
2605 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2606 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2607 ret = -EINVAL;
2608 goto out;
2609 }
2610
2611 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2612 if (ret)
2613 goto out;
2614 cm_id_priv->alt_av.timeout =
2615 cm_ack_timeout(cm_id_priv->target_ack_delay,
2616 cm_id_priv->alt_av.timeout - 1);
2617
2618 ret = cm_alloc_msg(cm_id_priv, &msg);
2619 if (ret)
2620 goto out;
2621
2622 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2623 alternate_path, private_data, private_data_len);
2624 msg->timeout_ms = cm_id_priv->timeout_ms;
2625 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2626
2627 ret = ib_post_send_mad(msg, NULL);
2628 if (ret) {
2629 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2630 cm_free_msg(msg);
2631 return ret;
2632 }
2633
2634 cm_id->lap_state = IB_CM_LAP_SENT;
2635 cm_id_priv->msg = msg;
2636
2637out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2638 return ret;
2639}
2640EXPORT_SYMBOL(ib_send_cm_lap);
2641
2642static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2643 struct ib_sa_path_rec *path,
2644 struct cm_lap_msg *lap_msg)
2645{
2646 memset(path, 0, sizeof *path);
2647 path->dgid = lap_msg->alt_local_gid;
2648 path->sgid = lap_msg->alt_remote_gid;
2649 path->dlid = lap_msg->alt_local_lid;
2650 path->slid = lap_msg->alt_remote_lid;
2651 path->flow_label = cm_lap_get_flow_label(lap_msg);
2652 path->hop_limit = lap_msg->alt_hop_limit;
2653 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2654 path->reversible = 1;
2655 path->pkey = cm_id_priv->pkey;
2656 path->sl = cm_lap_get_sl(lap_msg);
2657 path->mtu_selector = IB_SA_EQ;
2658 path->mtu = cm_id_priv->path_mtu;
2659 path->rate_selector = IB_SA_EQ;
2660 path->rate = cm_lap_get_packet_rate(lap_msg);
2661 path->packet_life_time_selector = IB_SA_EQ;
2662 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2663 path->packet_life_time -= (path->packet_life_time > 0);
2664}
2665
2666static int cm_lap_handler(struct cm_work *work)
2667{
2668 struct cm_id_private *cm_id_priv;
2669 struct cm_lap_msg *lap_msg;
2670 struct ib_cm_lap_event_param *param;
2671 struct ib_mad_send_buf *msg = NULL;
2672 int ret;
2673
2674 /* todo: verify LAP request and send reject APR if invalid. */
2675 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2676 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2677 lap_msg->local_comm_id);
2678 if (!cm_id_priv)
2679 return -EINVAL;
2680
2681 param = &work->cm_event.param.lap_rcvd;
2682 param->alternate_path = &work->path[0];
2683 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2684 work->cm_event.private_data = &lap_msg->private_data;
2685
2686 spin_lock_irq(&cm_id_priv->lock);
2687 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2688 goto unlock;
2689
2690 switch (cm_id_priv->id.lap_state) {
2691 case IB_CM_LAP_UNINIT:
2692 case IB_CM_LAP_IDLE:
2693 break;
2694 case IB_CM_MRA_LAP_SENT:
2695 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2696 counter[CM_LAP_COUNTER]);
2697 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2698 goto unlock;
2699
2700 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2701 CM_MSG_RESPONSE_OTHER,
2702 cm_id_priv->service_timeout,
2703 cm_id_priv->private_data,
2704 cm_id_priv->private_data_len);
2705 spin_unlock_irq(&cm_id_priv->lock);
2706
2707 if (ib_post_send_mad(msg, NULL))
2708 cm_free_msg(msg);
2709 goto deref;
2710 case IB_CM_LAP_RCVD:
2711 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2712 counter[CM_LAP_COUNTER]);
2713 goto unlock;
2714 default:
2715 goto unlock;
2716 }
2717
2718 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2719 cm_id_priv->tid = lap_msg->hdr.tid;
2720 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2721 work->mad_recv_wc->recv_buf.grh,
2722 &cm_id_priv->av);
2723 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2724 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2725 if (!ret)
2726 list_add_tail(&work->list, &cm_id_priv->work_list);
2727 spin_unlock_irq(&cm_id_priv->lock);
2728
2729 if (ret)
2730 cm_process_work(cm_id_priv, work);
2731 else
2732 cm_deref_id(cm_id_priv);
2733 return 0;
2734
2735unlock: spin_unlock_irq(&cm_id_priv->lock);
2736deref: cm_deref_id(cm_id_priv);
2737 return -EINVAL;
2738}
2739
2740static void cm_format_apr(struct cm_apr_msg *apr_msg,
2741 struct cm_id_private *cm_id_priv,
2742 enum ib_cm_apr_status status,
2743 void *info,
2744 u8 info_length,
2745 const void *private_data,
2746 u8 private_data_len)
2747{
2748 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2749 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2750 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2751 apr_msg->ap_status = (u8) status;
2752
2753 if (info && info_length) {
2754 apr_msg->info_length = info_length;
2755 memcpy(apr_msg->info, info, info_length);
2756 }
2757
2758 if (private_data && private_data_len)
2759 memcpy(apr_msg->private_data, private_data, private_data_len);
2760}
2761
2762int ib_send_cm_apr(struct ib_cm_id *cm_id,
2763 enum ib_cm_apr_status status,
2764 void *info,
2765 u8 info_length,
2766 const void *private_data,
2767 u8 private_data_len)
2768{
2769 struct cm_id_private *cm_id_priv;
2770 struct ib_mad_send_buf *msg;
2771 unsigned long flags;
2772 int ret;
2773
2774 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2775 (info && info_length > IB_CM_APR_INFO_LENGTH))
2776 return -EINVAL;
2777
2778 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2779 spin_lock_irqsave(&cm_id_priv->lock, flags);
2780 if (cm_id->state != IB_CM_ESTABLISHED ||
2781 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2782 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2783 ret = -EINVAL;
2784 goto out;
2785 }
2786
2787 ret = cm_alloc_msg(cm_id_priv, &msg);
2788 if (ret)
2789 goto out;
2790
2791 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2792 info, info_length, private_data, private_data_len);
2793 ret = ib_post_send_mad(msg, NULL);
2794 if (ret) {
2795 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2796 cm_free_msg(msg);
2797 return ret;
2798 }
2799
2800 cm_id->lap_state = IB_CM_LAP_IDLE;
2801out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2802 return ret;
2803}
2804EXPORT_SYMBOL(ib_send_cm_apr);
2805
2806static int cm_apr_handler(struct cm_work *work)
2807{
2808 struct cm_id_private *cm_id_priv;
2809 struct cm_apr_msg *apr_msg;
2810 int ret;
2811
2812 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2813 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2814 apr_msg->local_comm_id);
2815 if (!cm_id_priv)
2816 return -EINVAL; /* Unmatched reply. */
2817
2818 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2819 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2820 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2821 work->cm_event.private_data = &apr_msg->private_data;
2822
2823 spin_lock_irq(&cm_id_priv->lock);
2824 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2825 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2826 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2827 spin_unlock_irq(&cm_id_priv->lock);
2828 goto out;
2829 }
2830 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2831 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2832 cm_id_priv->msg = NULL;
2833
2834 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2835 if (!ret)
2836 list_add_tail(&work->list, &cm_id_priv->work_list);
2837 spin_unlock_irq(&cm_id_priv->lock);
2838
2839 if (ret)
2840 cm_process_work(cm_id_priv, work);
2841 else
2842 cm_deref_id(cm_id_priv);
2843 return 0;
2844out:
2845 cm_deref_id(cm_id_priv);
2846 return -EINVAL;
2847}
2848
2849static int cm_timewait_handler(struct cm_work *work)
2850{
2851 struct cm_timewait_info *timewait_info;
2852 struct cm_id_private *cm_id_priv;
2853 int ret;
2854
2855 timewait_info = (struct cm_timewait_info *)work;
2856 spin_lock_irq(&cm.lock);
2857 list_del(&timewait_info->list);
2858 spin_unlock_irq(&cm.lock);
2859
2860 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2861 timewait_info->work.remote_id);
2862 if (!cm_id_priv)
2863 return -EINVAL;
2864
2865 spin_lock_irq(&cm_id_priv->lock);
2866 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2867 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2868 spin_unlock_irq(&cm_id_priv->lock);
2869 goto out;
2870 }
2871 cm_id_priv->id.state = IB_CM_IDLE;
2872 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2873 if (!ret)
2874 list_add_tail(&work->list, &cm_id_priv->work_list);
2875 spin_unlock_irq(&cm_id_priv->lock);
2876
2877 if (ret)
2878 cm_process_work(cm_id_priv, work);
2879 else
2880 cm_deref_id(cm_id_priv);
2881 return 0;
2882out:
2883 cm_deref_id(cm_id_priv);
2884 return -EINVAL;
2885}
2886
2887static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2888 struct cm_id_private *cm_id_priv,
2889 struct ib_cm_sidr_req_param *param)
2890{
2891 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2892 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2893 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2894 sidr_req_msg->pkey = param->path->pkey;
2895 sidr_req_msg->service_id = param->service_id;
2896
2897 if (param->private_data && param->private_data_len)
2898 memcpy(sidr_req_msg->private_data, param->private_data,
2899 param->private_data_len);
2900}
2901
2902int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2903 struct ib_cm_sidr_req_param *param)
2904{
2905 struct cm_id_private *cm_id_priv;
2906 struct ib_mad_send_buf *msg;
2907 unsigned long flags;
2908 int ret;
2909
2910 if (!param->path || (param->private_data &&
2911 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2912 return -EINVAL;
2913
2914 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2915 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2916 if (ret)
2917 goto out;
2918
2919 cm_id->service_id = param->service_id;
2920 cm_id->service_mask = ~cpu_to_be64(0);
2921 cm_id_priv->timeout_ms = param->timeout_ms;
2922 cm_id_priv->max_cm_retries = param->max_cm_retries;
2923 ret = cm_alloc_msg(cm_id_priv, &msg);
2924 if (ret)
2925 goto out;
2926
2927 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2928 param);
2929 msg->timeout_ms = cm_id_priv->timeout_ms;
2930 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2931
2932 spin_lock_irqsave(&cm_id_priv->lock, flags);
2933 if (cm_id->state == IB_CM_IDLE)
2934 ret = ib_post_send_mad(msg, NULL);
2935 else
2936 ret = -EINVAL;
2937
2938 if (ret) {
2939 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2940 cm_free_msg(msg);
2941 goto out;
2942 }
2943 cm_id->state = IB_CM_SIDR_REQ_SENT;
2944 cm_id_priv->msg = msg;
2945 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2946out:
2947 return ret;
2948}
2949EXPORT_SYMBOL(ib_send_cm_sidr_req);
2950
2951static void cm_format_sidr_req_event(struct cm_work *work,
2952 struct ib_cm_id *listen_id)
2953{
2954 struct cm_sidr_req_msg *sidr_req_msg;
2955 struct ib_cm_sidr_req_event_param *param;
2956
2957 sidr_req_msg = (struct cm_sidr_req_msg *)
2958 work->mad_recv_wc->recv_buf.mad;
2959 param = &work->cm_event.param.sidr_req_rcvd;
2960 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2961 param->listen_id = listen_id;
2962 param->port = work->port->port_num;
2963 work->cm_event.private_data = &sidr_req_msg->private_data;
2964}
2965
2966static int cm_sidr_req_handler(struct cm_work *work)
2967{
2968 struct ib_cm_id *cm_id;
2969 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2970 struct cm_sidr_req_msg *sidr_req_msg;
2971 struct ib_wc *wc;
2972
2973 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
2974 if (IS_ERR(cm_id))
2975 return PTR_ERR(cm_id);
2976 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2977
2978 /* Record SGID/SLID and request ID for lookup. */
2979 sidr_req_msg = (struct cm_sidr_req_msg *)
2980 work->mad_recv_wc->recv_buf.mad;
2981 wc = work->mad_recv_wc->wc;
2982 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2983 cm_id_priv->av.dgid.global.interface_id = 0;
2984 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2985 work->mad_recv_wc->recv_buf.grh,
2986 &cm_id_priv->av);
2987 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2988 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2989 atomic_inc(&cm_id_priv->work_count);
2990
2991 spin_lock_irq(&cm.lock);
2992 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2993 if (cur_cm_id_priv) {
2994 spin_unlock_irq(&cm.lock);
2995 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2996 counter[CM_SIDR_REQ_COUNTER]);
2997 goto out; /* Duplicate message. */
2998 }
2999 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3000 cur_cm_id_priv = cm_find_listen(cm_id->device,
3001 sidr_req_msg->service_id,
3002 sidr_req_msg->private_data);
3003 if (!cur_cm_id_priv) {
3004 spin_unlock_irq(&cm.lock);
3005 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3006 goto out; /* No match. */
3007 }
3008 atomic_inc(&cur_cm_id_priv->refcount);
3009 atomic_inc(&cm_id_priv->refcount);
3010 spin_unlock_irq(&cm.lock);
3011
3012 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3013 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3014 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3015 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3016
3017 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3018 cm_process_work(cm_id_priv, work);
3019 cm_deref_id(cur_cm_id_priv);
3020 return 0;
3021out:
3022 ib_destroy_cm_id(&cm_id_priv->id);
3023 return -EINVAL;
3024}
3025
3026static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3027 struct cm_id_private *cm_id_priv,
3028 struct ib_cm_sidr_rep_param *param)
3029{
3030 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3031 cm_id_priv->tid);
3032 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3033 sidr_rep_msg->status = param->status;
3034 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3035 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3036 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3037
3038 if (param->info && param->info_length)
3039 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3040
3041 if (param->private_data && param->private_data_len)
3042 memcpy(sidr_rep_msg->private_data, param->private_data,
3043 param->private_data_len);
3044}
3045
3046int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3047 struct ib_cm_sidr_rep_param *param)
3048{
3049 struct cm_id_private *cm_id_priv;
3050 struct ib_mad_send_buf *msg;
3051 unsigned long flags;
3052 int ret;
3053
3054 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3055 (param->private_data &&
3056 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3057 return -EINVAL;
3058
3059 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3060 spin_lock_irqsave(&cm_id_priv->lock, flags);
3061 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3062 ret = -EINVAL;
3063 goto error;
3064 }
3065
3066 ret = cm_alloc_msg(cm_id_priv, &msg);
3067 if (ret)
3068 goto error;
3069
3070 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3071 param);
3072 ret = ib_post_send_mad(msg, NULL);
3073 if (ret) {
3074 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3075 cm_free_msg(msg);
3076 return ret;
3077 }
3078 cm_id->state = IB_CM_IDLE;
3079 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3080
3081 spin_lock_irqsave(&cm.lock, flags);
3082 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3083 spin_unlock_irqrestore(&cm.lock, flags);
3084 return 0;
3085
3086error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3087 return ret;
3088}
3089EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3090
3091static void cm_format_sidr_rep_event(struct cm_work *work)
3092{
3093 struct cm_sidr_rep_msg *sidr_rep_msg;
3094 struct ib_cm_sidr_rep_event_param *param;
3095
3096 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3097 work->mad_recv_wc->recv_buf.mad;
3098 param = &work->cm_event.param.sidr_rep_rcvd;
3099 param->status = sidr_rep_msg->status;
3100 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3101 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3102 param->info = &sidr_rep_msg->info;
3103 param->info_len = sidr_rep_msg->info_length;
3104 work->cm_event.private_data = &sidr_rep_msg->private_data;
3105}
3106
3107static int cm_sidr_rep_handler(struct cm_work *work)
3108{
3109 struct cm_sidr_rep_msg *sidr_rep_msg;
3110 struct cm_id_private *cm_id_priv;
3111
3112 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3113 work->mad_recv_wc->recv_buf.mad;
3114 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3115 if (!cm_id_priv)
3116 return -EINVAL; /* Unmatched reply. */
3117
3118 spin_lock_irq(&cm_id_priv->lock);
3119 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3120 spin_unlock_irq(&cm_id_priv->lock);
3121 goto out;
3122 }
3123 cm_id_priv->id.state = IB_CM_IDLE;
3124 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3125 spin_unlock_irq(&cm_id_priv->lock);
3126
3127 cm_format_sidr_rep_event(work);
3128 cm_process_work(cm_id_priv, work);
3129 return 0;
3130out:
3131 cm_deref_id(cm_id_priv);
3132 return -EINVAL;
3133}
3134
3135static void cm_process_send_error(struct ib_mad_send_buf *msg,
3136 enum ib_wc_status wc_status)
3137{
3138 struct cm_id_private *cm_id_priv;
3139 struct ib_cm_event cm_event;
3140 enum ib_cm_state state;
3141 int ret;
3142
3143 memset(&cm_event, 0, sizeof cm_event);
3144 cm_id_priv = msg->context[0];
3145
3146 /* Discard old sends or ones without a response. */
3147 spin_lock_irq(&cm_id_priv->lock);
3148 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3149 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3150 goto discard;
3151
3152 switch (state) {
3153 case IB_CM_REQ_SENT:
3154 case IB_CM_MRA_REQ_RCVD:
3155 cm_reset_to_idle(cm_id_priv);
3156 cm_event.event = IB_CM_REQ_ERROR;
3157 break;
3158 case IB_CM_REP_SENT:
3159 case IB_CM_MRA_REP_RCVD:
3160 cm_reset_to_idle(cm_id_priv);
3161 cm_event.event = IB_CM_REP_ERROR;
3162 break;
3163 case IB_CM_DREQ_SENT:
3164 cm_enter_timewait(cm_id_priv);
3165 cm_event.event = IB_CM_DREQ_ERROR;
3166 break;
3167 case IB_CM_SIDR_REQ_SENT:
3168 cm_id_priv->id.state = IB_CM_IDLE;
3169 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3170 break;
3171 default:
3172 goto discard;
3173 }
3174 spin_unlock_irq(&cm_id_priv->lock);
3175 cm_event.param.send_status = wc_status;
3176
3177 /* No other events can occur on the cm_id at this point. */
3178 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3179 cm_free_msg(msg);
3180 if (ret)
3181 ib_destroy_cm_id(&cm_id_priv->id);
3182 return;
3183discard:
3184 spin_unlock_irq(&cm_id_priv->lock);
3185 cm_free_msg(msg);
3186}
3187
3188static void cm_send_handler(struct ib_mad_agent *mad_agent,
3189 struct ib_mad_send_wc *mad_send_wc)
3190{
3191 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3192 struct cm_port *port;
3193 u16 attr_index;
3194
3195 port = mad_agent->context;
3196 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3197 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3198
3199 /*
3200 * If the send was in response to a received message (context[0] is not
3201 * set to a cm_id), and is not a REJ, then it is a send that was
3202 * manually retried.
3203 */
3204 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3205 msg->retries = 1;
3206
3207 atomic_long_add(1 + msg->retries,
3208 &port->counter_group[CM_XMIT].counter[attr_index]);
3209 if (msg->retries)
3210 atomic_long_add(msg->retries,
3211 &port->counter_group[CM_XMIT_RETRIES].
3212 counter[attr_index]);
3213
3214 switch (mad_send_wc->status) {
3215 case IB_WC_SUCCESS:
3216 case IB_WC_WR_FLUSH_ERR:
3217 cm_free_msg(msg);
3218 break;
3219 default:
3220 if (msg->context[0] && msg->context[1])
3221 cm_process_send_error(msg, mad_send_wc->status);
3222 else
3223 cm_free_msg(msg);
3224 break;
3225 }
3226}
3227
3228static void cm_work_handler(struct work_struct *_work)
3229{
3230 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3231 int ret;
3232
3233 switch (work->cm_event.event) {
3234 case IB_CM_REQ_RECEIVED:
3235 ret = cm_req_handler(work);
3236 break;
3237 case IB_CM_MRA_RECEIVED:
3238 ret = cm_mra_handler(work);
3239 break;
3240 case IB_CM_REJ_RECEIVED:
3241 ret = cm_rej_handler(work);
3242 break;
3243 case IB_CM_REP_RECEIVED:
3244 ret = cm_rep_handler(work);
3245 break;
3246 case IB_CM_RTU_RECEIVED:
3247 ret = cm_rtu_handler(work);
3248 break;
3249 case IB_CM_USER_ESTABLISHED:
3250 ret = cm_establish_handler(work);
3251 break;
3252 case IB_CM_DREQ_RECEIVED:
3253 ret = cm_dreq_handler(work);
3254 break;
3255 case IB_CM_DREP_RECEIVED:
3256 ret = cm_drep_handler(work);
3257 break;
3258 case IB_CM_SIDR_REQ_RECEIVED:
3259 ret = cm_sidr_req_handler(work);
3260 break;
3261 case IB_CM_SIDR_REP_RECEIVED:
3262 ret = cm_sidr_rep_handler(work);
3263 break;
3264 case IB_CM_LAP_RECEIVED:
3265 ret = cm_lap_handler(work);
3266 break;
3267 case IB_CM_APR_RECEIVED:
3268 ret = cm_apr_handler(work);
3269 break;
3270 case IB_CM_TIMEWAIT_EXIT:
3271 ret = cm_timewait_handler(work);
3272 break;
3273 default:
3274 ret = -EINVAL;
3275 break;
3276 }
3277 if (ret)
3278 cm_free_work(work);
3279}
3280
3281static int cm_establish(struct ib_cm_id *cm_id)
3282{
3283 struct cm_id_private *cm_id_priv;
3284 struct cm_work *work;
3285 unsigned long flags;
3286 int ret = 0;
3287
3288 work = kmalloc(sizeof *work, GFP_ATOMIC);
3289 if (!work)
3290 return -ENOMEM;
3291
3292 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3293 spin_lock_irqsave(&cm_id_priv->lock, flags);
3294 switch (cm_id->state)
3295 {
3296 case IB_CM_REP_SENT:
3297 case IB_CM_MRA_REP_RCVD:
3298 cm_id->state = IB_CM_ESTABLISHED;
3299 break;
3300 case IB_CM_ESTABLISHED:
3301 ret = -EISCONN;
3302 break;
3303 default:
3304 ret = -EINVAL;
3305 break;
3306 }
3307 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3308
3309 if (ret) {
3310 kfree(work);
3311 goto out;
3312 }
3313
3314 /*
3315 * The CM worker thread may try to destroy the cm_id before it
3316 * can execute this work item. To prevent potential deadlock,
3317 * we need to find the cm_id once we're in the context of the
3318 * worker thread, rather than holding a reference on it.
3319 */
3320 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3321 work->local_id = cm_id->local_id;
3322 work->remote_id = cm_id->remote_id;
3323 work->mad_recv_wc = NULL;
3324 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3325 queue_delayed_work(cm.wq, &work->work, 0);
3326out:
3327 return ret;
3328}
3329
3330static int cm_migrate(struct ib_cm_id *cm_id)
3331{
3332 struct cm_id_private *cm_id_priv;
3333 unsigned long flags;
3334 int ret = 0;
3335
3336 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3337 spin_lock_irqsave(&cm_id_priv->lock, flags);
3338 if (cm_id->state == IB_CM_ESTABLISHED &&
3339 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3340 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3341 cm_id->lap_state = IB_CM_LAP_IDLE;
3342 cm_id_priv->av = cm_id_priv->alt_av;
3343 } else
3344 ret = -EINVAL;
3345 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3346
3347 return ret;
3348}
3349
3350int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3351{
3352 int ret;
3353
3354 switch (event) {
3355 case IB_EVENT_COMM_EST:
3356 ret = cm_establish(cm_id);
3357 break;
3358 case IB_EVENT_PATH_MIG:
3359 ret = cm_migrate(cm_id);
3360 break;
3361 default:
3362 ret = -EINVAL;
3363 }
3364 return ret;
3365}
3366EXPORT_SYMBOL(ib_cm_notify);
3367
3368static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3369 struct ib_mad_recv_wc *mad_recv_wc)
3370{
3371 struct cm_port *port = mad_agent->context;
3372 struct cm_work *work;
3373 enum ib_cm_event_type event;
3374 u16 attr_id;
3375 int paths = 0;
3376
3377 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3378 case CM_REQ_ATTR_ID:
3379 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3380 alt_local_lid != 0);
3381 event = IB_CM_REQ_RECEIVED;
3382 break;
3383 case CM_MRA_ATTR_ID:
3384 event = IB_CM_MRA_RECEIVED;
3385 break;
3386 case CM_REJ_ATTR_ID:
3387 event = IB_CM_REJ_RECEIVED;
3388 break;
3389 case CM_REP_ATTR_ID:
3390 event = IB_CM_REP_RECEIVED;
3391 break;
3392 case CM_RTU_ATTR_ID:
3393 event = IB_CM_RTU_RECEIVED;
3394 break;
3395 case CM_DREQ_ATTR_ID:
3396 event = IB_CM_DREQ_RECEIVED;
3397 break;
3398 case CM_DREP_ATTR_ID:
3399 event = IB_CM_DREP_RECEIVED;
3400 break;
3401 case CM_SIDR_REQ_ATTR_ID:
3402 event = IB_CM_SIDR_REQ_RECEIVED;
3403 break;
3404 case CM_SIDR_REP_ATTR_ID:
3405 event = IB_CM_SIDR_REP_RECEIVED;
3406 break;
3407 case CM_LAP_ATTR_ID:
3408 paths = 1;
3409 event = IB_CM_LAP_RECEIVED;
3410 break;
3411 case CM_APR_ATTR_ID:
3412 event = IB_CM_APR_RECEIVED;
3413 break;
3414 default:
3415 ib_free_recv_mad(mad_recv_wc);
3416 return;
3417 }
3418
3419 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3420 atomic_long_inc(&port->counter_group[CM_RECV].
3421 counter[attr_id - CM_ATTR_ID_OFFSET]);
3422
3423 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3424 GFP_KERNEL);
3425 if (!work) {
3426 ib_free_recv_mad(mad_recv_wc);
3427 return;
3428 }
3429
3430 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3431 work->cm_event.event = event;
3432 work->mad_recv_wc = mad_recv_wc;
3433 work->port = port;
3434 queue_delayed_work(cm.wq, &work->work, 0);
3435}
3436
3437static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3438 struct ib_qp_attr *qp_attr,
3439 int *qp_attr_mask)
3440{
3441 unsigned long flags;
3442 int ret;
3443
3444 spin_lock_irqsave(&cm_id_priv->lock, flags);
3445 switch (cm_id_priv->id.state) {
3446 case IB_CM_REQ_SENT:
3447 case IB_CM_MRA_REQ_RCVD:
3448 case IB_CM_REQ_RCVD:
3449 case IB_CM_MRA_REQ_SENT:
3450 case IB_CM_REP_RCVD:
3451 case IB_CM_MRA_REP_SENT:
3452 case IB_CM_REP_SENT:
3453 case IB_CM_MRA_REP_RCVD:
3454 case IB_CM_ESTABLISHED:
3455 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3456 IB_QP_PKEY_INDEX | IB_QP_PORT;
3457 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3458 if (cm_id_priv->responder_resources)
3459 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3460 IB_ACCESS_REMOTE_ATOMIC;
3461 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3462 qp_attr->port_num = cm_id_priv->av.port->port_num;
3463 ret = 0;
3464 break;
3465 default:
3466 ret = -EINVAL;
3467 break;
3468 }
3469 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3470 return ret;
3471}
3472
3473static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3474 struct ib_qp_attr *qp_attr,
3475 int *qp_attr_mask)
3476{
3477 unsigned long flags;
3478 int ret;
3479
3480 spin_lock_irqsave(&cm_id_priv->lock, flags);
3481 switch (cm_id_priv->id.state) {
3482 case IB_CM_REQ_RCVD:
3483 case IB_CM_MRA_REQ_SENT:
3484 case IB_CM_REP_RCVD:
3485 case IB_CM_MRA_REP_SENT:
3486 case IB_CM_REP_SENT:
3487 case IB_CM_MRA_REP_RCVD:
3488 case IB_CM_ESTABLISHED:
3489 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3490 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3491 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3492 qp_attr->path_mtu = cm_id_priv->path_mtu;
3493 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3494 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3495 if (cm_id_priv->qp_type == IB_QPT_RC) {
3496 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3497 IB_QP_MIN_RNR_TIMER;
3498 qp_attr->max_dest_rd_atomic =
3499 cm_id_priv->responder_resources;
3500 qp_attr->min_rnr_timer = 0;
3501 }
3502 if (cm_id_priv->alt_av.ah_attr.dlid) {
3503 *qp_attr_mask |= IB_QP_ALT_PATH;
3504 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3505 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3506 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3507 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3508 }
3509 ret = 0;
3510 break;
3511 default:
3512 ret = -EINVAL;
3513 break;
3514 }
3515 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3516 return ret;
3517}
3518
3519static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3520 struct ib_qp_attr *qp_attr,
3521 int *qp_attr_mask)
3522{
3523 unsigned long flags;
3524 int ret;
3525
3526 spin_lock_irqsave(&cm_id_priv->lock, flags);
3527 switch (cm_id_priv->id.state) {
3528 /* Allow transition to RTS before sending REP */
3529 case IB_CM_REQ_RCVD:
3530 case IB_CM_MRA_REQ_SENT:
3531
3532 case IB_CM_REP_RCVD:
3533 case IB_CM_MRA_REP_SENT:
3534 case IB_CM_REP_SENT:
3535 case IB_CM_MRA_REP_RCVD:
3536 case IB_CM_ESTABLISHED:
3537 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3538 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3539 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3540 if (cm_id_priv->qp_type == IB_QPT_RC) {
3541 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3542 IB_QP_RNR_RETRY |
3543 IB_QP_MAX_QP_RD_ATOMIC;
3544 qp_attr->timeout = cm_id_priv->av.timeout;
3545 qp_attr->retry_cnt = cm_id_priv->retry_count;
3546 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3547 qp_attr->max_rd_atomic =
3548 cm_id_priv->initiator_depth;
3549 }
3550 if (cm_id_priv->alt_av.ah_attr.dlid) {
3551 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3552 qp_attr->path_mig_state = IB_MIG_REARM;
3553 }
3554 } else {
3555 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3556 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3557 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3558 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3559 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3560 qp_attr->path_mig_state = IB_MIG_REARM;
3561 }
3562 ret = 0;
3563 break;
3564 default:
3565 ret = -EINVAL;
3566 break;
3567 }
3568 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3569 return ret;
3570}
3571
3572int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3573 struct ib_qp_attr *qp_attr,
3574 int *qp_attr_mask)
3575{
3576 struct cm_id_private *cm_id_priv;
3577 int ret;
3578
3579 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3580 switch (qp_attr->qp_state) {
3581 case IB_QPS_INIT:
3582 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3583 break;
3584 case IB_QPS_RTR:
3585 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3586 break;
3587 case IB_QPS_RTS:
3588 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3589 break;
3590 default:
3591 ret = -EINVAL;
3592 break;
3593 }
3594 return ret;
3595}
3596EXPORT_SYMBOL(ib_cm_init_qp_attr);
3597
3598static void cm_get_ack_delay(struct cm_device *cm_dev)
3599{
3600 struct ib_device_attr attr;
3601
3602 if (ib_query_device(cm_dev->ib_device, &attr))
3603 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3604 else
3605 cm_dev->ack_delay = attr.local_ca_ack_delay;
3606}
3607
3608static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3609 char *buf)
3610{
3611 struct cm_counter_group *group;
3612 struct cm_counter_attribute *cm_attr;
3613
3614 group = container_of(obj, struct cm_counter_group, obj);
3615 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3616
3617 return sprintf(buf, "%ld\n",
3618 atomic_long_read(&group->counter[cm_attr->index]));
3619}
3620
3621static const struct sysfs_ops cm_counter_ops = {
3622 .show = cm_show_counter
3623};
3624
3625static struct kobj_type cm_counter_obj_type = {
3626 .sysfs_ops = &cm_counter_ops,
3627 .default_attrs = cm_counter_default_attrs
3628};
3629
3630static void cm_release_port_obj(struct kobject *obj)
3631{
3632 struct cm_port *cm_port;
3633
3634 cm_port = container_of(obj, struct cm_port, port_obj);
3635 kfree(cm_port);
3636}
3637
3638static struct kobj_type cm_port_obj_type = {
3639 .release = cm_release_port_obj
3640};
3641
3642static char *cm_devnode(struct device *dev, mode_t *mode)
3643{
3644 if (mode)
3645 *mode = 0666;
3646 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3647}
3648
3649struct class cm_class = {
3650 .owner = THIS_MODULE,
3651 .name = "infiniband_cm",
3652 .devnode = cm_devnode,
3653};
3654EXPORT_SYMBOL(cm_class);
3655
3656static int cm_create_port_fs(struct cm_port *port)
3657{
3658 int i, ret;
3659
3660 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3661 &port->cm_dev->device->kobj,
3662 "%d", port->port_num);
3663 if (ret) {
3664 kfree(port);
3665 return ret;
3666 }
3667
3668 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3669 ret = kobject_init_and_add(&port->counter_group[i].obj,
3670 &cm_counter_obj_type,
3671 &port->port_obj,
3672 "%s", counter_group_names[i]);
3673 if (ret)
3674 goto error;
3675 }
3676
3677 return 0;
3678
3679error:
3680 while (i--)
3681 kobject_put(&port->counter_group[i].obj);
3682 kobject_put(&port->port_obj);
3683 return ret;
3684
3685}
3686
3687static void cm_remove_port_fs(struct cm_port *port)
3688{
3689 int i;
3690
3691 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3692 kobject_put(&port->counter_group[i].obj);
3693
3694 kobject_put(&port->port_obj);
3695}
3696
3697static void cm_add_one(struct ib_device *ib_device)
3698{
3699 struct cm_device *cm_dev;
3700 struct cm_port *port;
3701 struct ib_mad_reg_req reg_req = {
3702 .mgmt_class = IB_MGMT_CLASS_CM,
3703 .mgmt_class_version = IB_CM_CLASS_VERSION
3704 };
3705 struct ib_port_modify port_modify = {
3706 .set_port_cap_mask = IB_PORT_CM_SUP
3707 };
3708 unsigned long flags;
3709 int ret;
3710 u8 i;
3711
3712 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
3713 return;
3714
3715 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3716 ib_device->phys_port_cnt, GFP_KERNEL);
3717 if (!cm_dev)
3718 return;
3719
3720 cm_dev->ib_device = ib_device;
3721 cm_get_ack_delay(cm_dev);
3722
3723 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3724 MKDEV(0, 0), NULL,
3725 "%s", ib_device->name);
3726 if (IS_ERR(cm_dev->device)) {
3727 kfree(cm_dev);
3728 return;
3729 }
3730
3731 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3732 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3733 port = kzalloc(sizeof *port, GFP_KERNEL);
3734 if (!port)
3735 goto error1;
3736
3737 cm_dev->port[i-1] = port;
3738 port->cm_dev = cm_dev;
3739 port->port_num = i;
3740
3741 ret = cm_create_port_fs(port);
3742 if (ret)
3743 goto error1;
3744
3745 port->mad_agent = ib_register_mad_agent(ib_device, i,
3746 IB_QPT_GSI,
3747 ®_req,
3748 0,
3749 cm_send_handler,
3750 cm_recv_handler,
3751 port);
3752 if (IS_ERR(port->mad_agent))
3753 goto error2;
3754
3755 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3756 if (ret)
3757 goto error3;
3758 }
3759 ib_set_client_data(ib_device, &cm_client, cm_dev);
3760
3761 write_lock_irqsave(&cm.device_lock, flags);
3762 list_add_tail(&cm_dev->list, &cm.device_list);
3763 write_unlock_irqrestore(&cm.device_lock, flags);
3764 return;
3765
3766error3:
3767 ib_unregister_mad_agent(port->mad_agent);
3768error2:
3769 cm_remove_port_fs(port);
3770error1:
3771 port_modify.set_port_cap_mask = 0;
3772 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3773 while (--i) {
3774 port = cm_dev->port[i-1];
3775 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3776 ib_unregister_mad_agent(port->mad_agent);
3777 cm_remove_port_fs(port);
3778 }
3779 device_unregister(cm_dev->device);
3780 kfree(cm_dev);
3781}
3782
3783static void cm_remove_one(struct ib_device *ib_device)
3784{
3785 struct cm_device *cm_dev;
3786 struct cm_port *port;
3787 struct ib_port_modify port_modify = {
3788 .clr_port_cap_mask = IB_PORT_CM_SUP
3789 };
3790 unsigned long flags;
3791 int i;
3792
3793 cm_dev = ib_get_client_data(ib_device, &cm_client);
3794 if (!cm_dev)
3795 return;
3796
3797 write_lock_irqsave(&cm.device_lock, flags);
3798 list_del(&cm_dev->list);
3799 write_unlock_irqrestore(&cm.device_lock, flags);
3800
3801 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3802 port = cm_dev->port[i-1];
3803 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3804 ib_unregister_mad_agent(port->mad_agent);
3805 flush_workqueue(cm.wq);
3806 cm_remove_port_fs(port);
3807 }
3808 device_unregister(cm_dev->device);
3809 kfree(cm_dev);
3810}
3811
3812static int __init ib_cm_init(void)
3813{
3814 int ret;
3815
3816 memset(&cm, 0, sizeof cm);
3817 INIT_LIST_HEAD(&cm.device_list);
3818 rwlock_init(&cm.device_lock);
3819 spin_lock_init(&cm.lock);
3820 cm.listen_service_table = RB_ROOT;
3821 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3822 cm.remote_id_table = RB_ROOT;
3823 cm.remote_qp_table = RB_ROOT;
3824 cm.remote_sidr_table = RB_ROOT;
3825 idr_init(&cm.local_id_table);
3826 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3827 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3828 INIT_LIST_HEAD(&cm.timewait_list);
3829
3830 ret = class_register(&cm_class);
3831 if (ret)
3832 return -ENOMEM;
3833
3834 cm.wq = create_workqueue("ib_cm");
3835 if (!cm.wq) {
3836 ret = -ENOMEM;
3837 goto error1;
3838 }
3839
3840 ret = ib_register_client(&cm_client);
3841 if (ret)
3842 goto error2;
3843
3844 return 0;
3845error2:
3846 destroy_workqueue(cm.wq);
3847error1:
3848 class_unregister(&cm_class);
3849 return ret;
3850}
3851
3852static void __exit ib_cm_cleanup(void)
3853{
3854 struct cm_timewait_info *timewait_info, *tmp;
3855
3856 spin_lock_irq(&cm.lock);
3857 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3858 cancel_delayed_work(&timewait_info->work.work);
3859 spin_unlock_irq(&cm.lock);
3860
3861 ib_unregister_client(&cm_client);
3862 destroy_workqueue(cm.wq);
3863
3864 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3865 list_del(&timewait_info->list);
3866 kfree(timewait_info);
3867 }
3868
3869 class_unregister(&cm_class);
3870 idr_destroy(&cm.local_id_table);
3871}
3872
3873module_init(ib_cm_init);
3874module_exit(ib_cm_cleanup);
3875
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);