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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/*
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/module.h>
40#include <linux/err.h>
41#include <linux/idr.h>
42#include <linux/interrupt.h>
43#include <linux/random.h>
44#include <linux/rbtree.h>
45#include <linux/spinlock.h>
46#include <linux/slab.h>
47#include <linux/sysfs.h>
48#include <linux/workqueue.h>
49#include <linux/kdev_t.h>
50#include <linux/etherdevice.h>
51
52#include <rdma/ib_cache.h>
53#include <rdma/ib_cm.h>
54#include "cm_msgs.h"
55#include "core_priv.h"
56
57MODULE_AUTHOR("Sean Hefty");
58MODULE_DESCRIPTION("InfiniBand CM");
59MODULE_LICENSE("Dual BSD/GPL");
60
61static const char * const ibcm_rej_reason_strs[] = {
62 [IB_CM_REJ_NO_QP] = "no QP",
63 [IB_CM_REJ_NO_EEC] = "no EEC",
64 [IB_CM_REJ_NO_RESOURCES] = "no resources",
65 [IB_CM_REJ_TIMEOUT] = "timeout",
66 [IB_CM_REJ_UNSUPPORTED] = "unsupported",
67 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
68 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
69 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
70 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
71 [IB_CM_REJ_STALE_CONN] = "stale conn",
72 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
73 [IB_CM_REJ_INVALID_GID] = "invalid GID",
74 [IB_CM_REJ_INVALID_LID] = "invalid LID",
75 [IB_CM_REJ_INVALID_SL] = "invalid SL",
76 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
77 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
78 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
79 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
80 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
81 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
82 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
83 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
84 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
85 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
86 [IB_CM_REJ_PORT_REDIRECT] = "port redirect",
87 [IB_CM_REJ_INVALID_MTU] = "invalid MTU",
88 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
89 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
90 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
91 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
92 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
93 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
94 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
95};
96
97const char *__attribute_const__ ibcm_reject_msg(int reason)
98{
99 size_t index = reason;
100
101 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
102 ibcm_rej_reason_strs[index])
103 return ibcm_rej_reason_strs[index];
104 else
105 return "unrecognized reason";
106}
107EXPORT_SYMBOL(ibcm_reject_msg);
108
109static void cm_add_one(struct ib_device *device);
110static void cm_remove_one(struct ib_device *device, void *client_data);
111
112static struct ib_client cm_client = {
113 .name = "cm",
114 .add = cm_add_one,
115 .remove = cm_remove_one
116};
117
118static struct ib_cm {
119 spinlock_t lock;
120 struct list_head device_list;
121 rwlock_t device_lock;
122 struct rb_root listen_service_table;
123 u64 listen_service_id;
124 /* struct rb_root peer_service_table; todo: fix peer to peer */
125 struct rb_root remote_qp_table;
126 struct rb_root remote_id_table;
127 struct rb_root remote_sidr_table;
128 struct xarray local_id_table;
129 u32 local_id_next;
130 __be32 random_id_operand;
131 struct list_head timewait_list;
132 struct workqueue_struct *wq;
133 /* Sync on cm change port state */
134 spinlock_t state_lock;
135} cm;
136
137/* Counter indexes ordered by attribute ID */
138enum {
139 CM_REQ_COUNTER,
140 CM_MRA_COUNTER,
141 CM_REJ_COUNTER,
142 CM_REP_COUNTER,
143 CM_RTU_COUNTER,
144 CM_DREQ_COUNTER,
145 CM_DREP_COUNTER,
146 CM_SIDR_REQ_COUNTER,
147 CM_SIDR_REP_COUNTER,
148 CM_LAP_COUNTER,
149 CM_APR_COUNTER,
150 CM_ATTR_COUNT,
151 CM_ATTR_ID_OFFSET = 0x0010,
152};
153
154enum {
155 CM_XMIT,
156 CM_XMIT_RETRIES,
157 CM_RECV,
158 CM_RECV_DUPLICATES,
159 CM_COUNTER_GROUPS
160};
161
162static char const counter_group_names[CM_COUNTER_GROUPS]
163 [sizeof("cm_rx_duplicates")] = {
164 "cm_tx_msgs", "cm_tx_retries",
165 "cm_rx_msgs", "cm_rx_duplicates"
166};
167
168struct cm_counter_group {
169 struct kobject obj;
170 atomic_long_t counter[CM_ATTR_COUNT];
171};
172
173struct cm_counter_attribute {
174 struct attribute attr;
175 int index;
176};
177
178#define CM_COUNTER_ATTR(_name, _index) \
179struct cm_counter_attribute cm_##_name##_counter_attr = { \
180 .attr = { .name = __stringify(_name), .mode = 0444 }, \
181 .index = _index \
182}
183
184static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
185static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
186static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
187static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
188static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
189static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
190static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
191static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
192static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
193static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
194static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
195
196static struct attribute *cm_counter_default_attrs[] = {
197 &cm_req_counter_attr.attr,
198 &cm_mra_counter_attr.attr,
199 &cm_rej_counter_attr.attr,
200 &cm_rep_counter_attr.attr,
201 &cm_rtu_counter_attr.attr,
202 &cm_dreq_counter_attr.attr,
203 &cm_drep_counter_attr.attr,
204 &cm_sidr_req_counter_attr.attr,
205 &cm_sidr_rep_counter_attr.attr,
206 &cm_lap_counter_attr.attr,
207 &cm_apr_counter_attr.attr,
208 NULL
209};
210
211struct cm_port {
212 struct cm_device *cm_dev;
213 struct ib_mad_agent *mad_agent;
214 struct kobject port_obj;
215 u8 port_num;
216 struct list_head cm_priv_prim_list;
217 struct list_head cm_priv_altr_list;
218 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
219};
220
221struct cm_device {
222 struct list_head list;
223 struct ib_device *ib_device;
224 u8 ack_delay;
225 int going_down;
226 struct cm_port *port[0];
227};
228
229struct cm_av {
230 struct cm_port *port;
231 union ib_gid dgid;
232 struct rdma_ah_attr ah_attr;
233 u16 pkey_index;
234 u8 timeout;
235};
236
237struct cm_work {
238 struct delayed_work work;
239 struct list_head list;
240 struct cm_port *port;
241 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
242 __be32 local_id; /* Established / timewait */
243 __be32 remote_id;
244 struct ib_cm_event cm_event;
245 struct sa_path_rec path[0];
246};
247
248struct cm_timewait_info {
249 struct cm_work work; /* Must be first. */
250 struct list_head list;
251 struct rb_node remote_qp_node;
252 struct rb_node remote_id_node;
253 __be64 remote_ca_guid;
254 __be32 remote_qpn;
255 u8 inserted_remote_qp;
256 u8 inserted_remote_id;
257};
258
259struct cm_id_private {
260 struct ib_cm_id id;
261
262 struct rb_node service_node;
263 struct rb_node sidr_id_node;
264 spinlock_t lock; /* Do not acquire inside cm.lock */
265 struct completion comp;
266 atomic_t refcount;
267 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
268 * Protected by the cm.lock spinlock. */
269 int listen_sharecount;
270
271 struct ib_mad_send_buf *msg;
272 struct cm_timewait_info *timewait_info;
273 /* todo: use alternate port on send failure */
274 struct cm_av av;
275 struct cm_av alt_av;
276
277 void *private_data;
278 __be64 tid;
279 __be32 local_qpn;
280 __be32 remote_qpn;
281 enum ib_qp_type qp_type;
282 __be32 sq_psn;
283 __be32 rq_psn;
284 int timeout_ms;
285 enum ib_mtu path_mtu;
286 __be16 pkey;
287 u8 private_data_len;
288 u8 max_cm_retries;
289 u8 peer_to_peer;
290 u8 responder_resources;
291 u8 initiator_depth;
292 u8 retry_count;
293 u8 rnr_retry_count;
294 u8 service_timeout;
295 u8 target_ack_delay;
296
297 struct list_head prim_list;
298 struct list_head altr_list;
299 /* Indicates that the send port mad is registered and av is set */
300 int prim_send_port_not_ready;
301 int altr_send_port_not_ready;
302
303 struct list_head work_list;
304 atomic_t work_count;
305};
306
307static void cm_work_handler(struct work_struct *work);
308
309static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
310{
311 if (atomic_dec_and_test(&cm_id_priv->refcount))
312 complete(&cm_id_priv->comp);
313}
314
315static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
316 struct ib_mad_send_buf **msg)
317{
318 struct ib_mad_agent *mad_agent;
319 struct ib_mad_send_buf *m;
320 struct ib_ah *ah;
321 struct cm_av *av;
322 unsigned long flags, flags2;
323 int ret = 0;
324
325 /* don't let the port to be released till the agent is down */
326 spin_lock_irqsave(&cm.state_lock, flags2);
327 spin_lock_irqsave(&cm.lock, flags);
328 if (!cm_id_priv->prim_send_port_not_ready)
329 av = &cm_id_priv->av;
330 else if (!cm_id_priv->altr_send_port_not_ready &&
331 (cm_id_priv->alt_av.port))
332 av = &cm_id_priv->alt_av;
333 else {
334 pr_info("%s: not valid CM id\n", __func__);
335 ret = -ENODEV;
336 spin_unlock_irqrestore(&cm.lock, flags);
337 goto out;
338 }
339 spin_unlock_irqrestore(&cm.lock, flags);
340 /* Make sure the port haven't released the mad yet */
341 mad_agent = cm_id_priv->av.port->mad_agent;
342 if (!mad_agent) {
343 pr_info("%s: not a valid MAD agent\n", __func__);
344 ret = -ENODEV;
345 goto out;
346 }
347 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr, 0);
348 if (IS_ERR(ah)) {
349 ret = PTR_ERR(ah);
350 goto out;
351 }
352
353 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
354 av->pkey_index,
355 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
356 GFP_ATOMIC,
357 IB_MGMT_BASE_VERSION);
358 if (IS_ERR(m)) {
359 rdma_destroy_ah(ah, 0);
360 ret = PTR_ERR(m);
361 goto out;
362 }
363
364 /* Timeout set by caller if response is expected. */
365 m->ah = ah;
366 m->retries = cm_id_priv->max_cm_retries;
367
368 atomic_inc(&cm_id_priv->refcount);
369 m->context[0] = cm_id_priv;
370 *msg = m;
371
372out:
373 spin_unlock_irqrestore(&cm.state_lock, flags2);
374 return ret;
375}
376
377static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
378 struct ib_mad_recv_wc *mad_recv_wc)
379{
380 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
381 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
382 GFP_ATOMIC,
383 IB_MGMT_BASE_VERSION);
384}
385
386static int cm_create_response_msg_ah(struct cm_port *port,
387 struct ib_mad_recv_wc *mad_recv_wc,
388 struct ib_mad_send_buf *msg)
389{
390 struct ib_ah *ah;
391
392 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
393 mad_recv_wc->recv_buf.grh, port->port_num);
394 if (IS_ERR(ah))
395 return PTR_ERR(ah);
396
397 msg->ah = ah;
398 return 0;
399}
400
401static void cm_free_msg(struct ib_mad_send_buf *msg)
402{
403 if (msg->ah)
404 rdma_destroy_ah(msg->ah, 0);
405 if (msg->context[0])
406 cm_deref_id(msg->context[0]);
407 ib_free_send_mad(msg);
408}
409
410static int cm_alloc_response_msg(struct cm_port *port,
411 struct ib_mad_recv_wc *mad_recv_wc,
412 struct ib_mad_send_buf **msg)
413{
414 struct ib_mad_send_buf *m;
415 int ret;
416
417 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
418 if (IS_ERR(m))
419 return PTR_ERR(m);
420
421 ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
422 if (ret) {
423 cm_free_msg(m);
424 return ret;
425 }
426
427 *msg = m;
428 return 0;
429}
430
431static void * cm_copy_private_data(const void *private_data,
432 u8 private_data_len)
433{
434 void *data;
435
436 if (!private_data || !private_data_len)
437 return NULL;
438
439 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
440 if (!data)
441 return ERR_PTR(-ENOMEM);
442
443 return data;
444}
445
446static void cm_set_private_data(struct cm_id_private *cm_id_priv,
447 void *private_data, u8 private_data_len)
448{
449 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
450 kfree(cm_id_priv->private_data);
451
452 cm_id_priv->private_data = private_data;
453 cm_id_priv->private_data_len = private_data_len;
454}
455
456static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
457 struct ib_grh *grh, struct cm_av *av)
458{
459 struct rdma_ah_attr new_ah_attr;
460 int ret;
461
462 av->port = port;
463 av->pkey_index = wc->pkey_index;
464
465 /*
466 * av->ah_attr might be initialized based on past wc during incoming
467 * connect request or while sending out connect request. So initialize
468 * a new ah_attr on stack. If initialization fails, old ah_attr is
469 * used for sending any responses. If initialization is successful,
470 * than new ah_attr is used by overwriting old one.
471 */
472 ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
473 port->port_num, wc,
474 grh, &new_ah_attr);
475 if (ret)
476 return ret;
477
478 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
479 return 0;
480}
481
482static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
483 struct ib_grh *grh, struct cm_av *av)
484{
485 av->port = port;
486 av->pkey_index = wc->pkey_index;
487 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
488 port->port_num, wc,
489 grh, &av->ah_attr);
490}
491
492static int add_cm_id_to_port_list(struct cm_id_private *cm_id_priv,
493 struct cm_av *av,
494 struct cm_port *port)
495{
496 unsigned long flags;
497 int ret = 0;
498
499 spin_lock_irqsave(&cm.lock, flags);
500
501 if (&cm_id_priv->av == av)
502 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list);
503 else if (&cm_id_priv->alt_av == av)
504 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list);
505 else
506 ret = -EINVAL;
507
508 spin_unlock_irqrestore(&cm.lock, flags);
509 return ret;
510}
511
512static struct cm_port *
513get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
514{
515 struct cm_device *cm_dev;
516 struct cm_port *port = NULL;
517 unsigned long flags;
518
519 if (attr) {
520 read_lock_irqsave(&cm.device_lock, flags);
521 list_for_each_entry(cm_dev, &cm.device_list, list) {
522 if (cm_dev->ib_device == attr->device) {
523 port = cm_dev->port[attr->port_num - 1];
524 break;
525 }
526 }
527 read_unlock_irqrestore(&cm.device_lock, flags);
528 } else {
529 /* SGID attribute can be NULL in following
530 * conditions.
531 * (a) Alternative path
532 * (b) IB link layer without GRH
533 * (c) LAP send messages
534 */
535 read_lock_irqsave(&cm.device_lock, flags);
536 list_for_each_entry(cm_dev, &cm.device_list, list) {
537 attr = rdma_find_gid(cm_dev->ib_device,
538 &path->sgid,
539 sa_conv_pathrec_to_gid_type(path),
540 NULL);
541 if (!IS_ERR(attr)) {
542 port = cm_dev->port[attr->port_num - 1];
543 break;
544 }
545 }
546 read_unlock_irqrestore(&cm.device_lock, flags);
547 if (port)
548 rdma_put_gid_attr(attr);
549 }
550 return port;
551}
552
553static int cm_init_av_by_path(struct sa_path_rec *path,
554 const struct ib_gid_attr *sgid_attr,
555 struct cm_av *av,
556 struct cm_id_private *cm_id_priv)
557{
558 struct rdma_ah_attr new_ah_attr;
559 struct cm_device *cm_dev;
560 struct cm_port *port;
561 int ret;
562
563 port = get_cm_port_from_path(path, sgid_attr);
564 if (!port)
565 return -EINVAL;
566 cm_dev = port->cm_dev;
567
568 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
569 be16_to_cpu(path->pkey), &av->pkey_index);
570 if (ret)
571 return ret;
572
573 av->port = port;
574
575 /*
576 * av->ah_attr might be initialized based on wc or during
577 * request processing time which might have reference to sgid_attr.
578 * So initialize a new ah_attr on stack.
579 * If initialization fails, old ah_attr is used for sending any
580 * responses. If initialization is successful, than new ah_attr
581 * is used by overwriting the old one. So that right ah_attr
582 * can be used to return an error response.
583 */
584 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
585 &new_ah_attr, sgid_attr);
586 if (ret)
587 return ret;
588
589 av->timeout = path->packet_life_time + 1;
590
591 ret = add_cm_id_to_port_list(cm_id_priv, av, port);
592 if (ret) {
593 rdma_destroy_ah_attr(&new_ah_attr);
594 return ret;
595 }
596 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
597 return 0;
598}
599
600static int cm_alloc_id(struct cm_id_private *cm_id_priv)
601{
602 int err;
603 u32 id;
604
605 err = xa_alloc_cyclic_irq(&cm.local_id_table, &id, cm_id_priv,
606 xa_limit_32b, &cm.local_id_next, GFP_KERNEL);
607
608 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
609 return err;
610}
611
612static u32 cm_local_id(__be32 local_id)
613{
614 return (__force u32) (local_id ^ cm.random_id_operand);
615}
616
617static void cm_free_id(__be32 local_id)
618{
619 xa_erase_irq(&cm.local_id_table, cm_local_id(local_id));
620}
621
622static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
623{
624 struct cm_id_private *cm_id_priv;
625
626 cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id));
627 if (cm_id_priv) {
628 if (cm_id_priv->id.remote_id == remote_id)
629 atomic_inc(&cm_id_priv->refcount);
630 else
631 cm_id_priv = NULL;
632 }
633
634 return cm_id_priv;
635}
636
637static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
638{
639 struct cm_id_private *cm_id_priv;
640
641 spin_lock_irq(&cm.lock);
642 cm_id_priv = cm_get_id(local_id, remote_id);
643 spin_unlock_irq(&cm.lock);
644
645 return cm_id_priv;
646}
647
648/*
649 * Trivial helpers to strip endian annotation and compare; the
650 * endianness doesn't actually matter since we just need a stable
651 * order for the RB tree.
652 */
653static int be32_lt(__be32 a, __be32 b)
654{
655 return (__force u32) a < (__force u32) b;
656}
657
658static int be32_gt(__be32 a, __be32 b)
659{
660 return (__force u32) a > (__force u32) b;
661}
662
663static int be64_lt(__be64 a, __be64 b)
664{
665 return (__force u64) a < (__force u64) b;
666}
667
668static int be64_gt(__be64 a, __be64 b)
669{
670 return (__force u64) a > (__force u64) b;
671}
672
673static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
674{
675 struct rb_node **link = &cm.listen_service_table.rb_node;
676 struct rb_node *parent = NULL;
677 struct cm_id_private *cur_cm_id_priv;
678 __be64 service_id = cm_id_priv->id.service_id;
679 __be64 service_mask = cm_id_priv->id.service_mask;
680
681 while (*link) {
682 parent = *link;
683 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
684 service_node);
685 if ((cur_cm_id_priv->id.service_mask & service_id) ==
686 (service_mask & cur_cm_id_priv->id.service_id) &&
687 (cm_id_priv->id.device == cur_cm_id_priv->id.device))
688 return cur_cm_id_priv;
689
690 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
691 link = &(*link)->rb_left;
692 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
693 link = &(*link)->rb_right;
694 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
695 link = &(*link)->rb_left;
696 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
697 link = &(*link)->rb_right;
698 else
699 link = &(*link)->rb_right;
700 }
701 rb_link_node(&cm_id_priv->service_node, parent, link);
702 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
703 return NULL;
704}
705
706static struct cm_id_private * cm_find_listen(struct ib_device *device,
707 __be64 service_id)
708{
709 struct rb_node *node = cm.listen_service_table.rb_node;
710 struct cm_id_private *cm_id_priv;
711
712 while (node) {
713 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
714 if ((cm_id_priv->id.service_mask & service_id) ==
715 cm_id_priv->id.service_id &&
716 (cm_id_priv->id.device == device))
717 return cm_id_priv;
718
719 if (device < cm_id_priv->id.device)
720 node = node->rb_left;
721 else if (device > cm_id_priv->id.device)
722 node = node->rb_right;
723 else if (be64_lt(service_id, cm_id_priv->id.service_id))
724 node = node->rb_left;
725 else if (be64_gt(service_id, cm_id_priv->id.service_id))
726 node = node->rb_right;
727 else
728 node = node->rb_right;
729 }
730 return NULL;
731}
732
733static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
734 *timewait_info)
735{
736 struct rb_node **link = &cm.remote_id_table.rb_node;
737 struct rb_node *parent = NULL;
738 struct cm_timewait_info *cur_timewait_info;
739 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
740 __be32 remote_id = timewait_info->work.remote_id;
741
742 while (*link) {
743 parent = *link;
744 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
745 remote_id_node);
746 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
747 link = &(*link)->rb_left;
748 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
749 link = &(*link)->rb_right;
750 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
751 link = &(*link)->rb_left;
752 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
753 link = &(*link)->rb_right;
754 else
755 return cur_timewait_info;
756 }
757 timewait_info->inserted_remote_id = 1;
758 rb_link_node(&timewait_info->remote_id_node, parent, link);
759 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
760 return NULL;
761}
762
763static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
764 __be32 remote_id)
765{
766 struct rb_node *node = cm.remote_id_table.rb_node;
767 struct cm_timewait_info *timewait_info;
768
769 while (node) {
770 timewait_info = rb_entry(node, struct cm_timewait_info,
771 remote_id_node);
772 if (be32_lt(remote_id, timewait_info->work.remote_id))
773 node = node->rb_left;
774 else if (be32_gt(remote_id, timewait_info->work.remote_id))
775 node = node->rb_right;
776 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
777 node = node->rb_left;
778 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
779 node = node->rb_right;
780 else
781 return timewait_info;
782 }
783 return NULL;
784}
785
786static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
787 *timewait_info)
788{
789 struct rb_node **link = &cm.remote_qp_table.rb_node;
790 struct rb_node *parent = NULL;
791 struct cm_timewait_info *cur_timewait_info;
792 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
793 __be32 remote_qpn = timewait_info->remote_qpn;
794
795 while (*link) {
796 parent = *link;
797 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
798 remote_qp_node);
799 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
800 link = &(*link)->rb_left;
801 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
802 link = &(*link)->rb_right;
803 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
804 link = &(*link)->rb_left;
805 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
806 link = &(*link)->rb_right;
807 else
808 return cur_timewait_info;
809 }
810 timewait_info->inserted_remote_qp = 1;
811 rb_link_node(&timewait_info->remote_qp_node, parent, link);
812 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
813 return NULL;
814}
815
816static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
817 *cm_id_priv)
818{
819 struct rb_node **link = &cm.remote_sidr_table.rb_node;
820 struct rb_node *parent = NULL;
821 struct cm_id_private *cur_cm_id_priv;
822 union ib_gid *port_gid = &cm_id_priv->av.dgid;
823 __be32 remote_id = cm_id_priv->id.remote_id;
824
825 while (*link) {
826 parent = *link;
827 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
828 sidr_id_node);
829 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
830 link = &(*link)->rb_left;
831 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
832 link = &(*link)->rb_right;
833 else {
834 int cmp;
835 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
836 sizeof *port_gid);
837 if (cmp < 0)
838 link = &(*link)->rb_left;
839 else if (cmp > 0)
840 link = &(*link)->rb_right;
841 else
842 return cur_cm_id_priv;
843 }
844 }
845 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
846 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
847 return NULL;
848}
849
850static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
851 enum ib_cm_sidr_status status)
852{
853 struct ib_cm_sidr_rep_param param;
854
855 memset(¶m, 0, sizeof param);
856 param.status = status;
857 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m);
858}
859
860struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
861 ib_cm_handler cm_handler,
862 void *context)
863{
864 struct cm_id_private *cm_id_priv;
865 int ret;
866
867 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
868 if (!cm_id_priv)
869 return ERR_PTR(-ENOMEM);
870
871 cm_id_priv->id.state = IB_CM_IDLE;
872 cm_id_priv->id.device = device;
873 cm_id_priv->id.cm_handler = cm_handler;
874 cm_id_priv->id.context = context;
875 cm_id_priv->id.remote_cm_qpn = 1;
876 ret = cm_alloc_id(cm_id_priv);
877 if (ret)
878 goto error;
879
880 spin_lock_init(&cm_id_priv->lock);
881 init_completion(&cm_id_priv->comp);
882 INIT_LIST_HEAD(&cm_id_priv->work_list);
883 INIT_LIST_HEAD(&cm_id_priv->prim_list);
884 INIT_LIST_HEAD(&cm_id_priv->altr_list);
885 atomic_set(&cm_id_priv->work_count, -1);
886 atomic_set(&cm_id_priv->refcount, 1);
887 return &cm_id_priv->id;
888
889error:
890 kfree(cm_id_priv);
891 return ERR_PTR(-ENOMEM);
892}
893EXPORT_SYMBOL(ib_create_cm_id);
894
895static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
896{
897 struct cm_work *work;
898
899 if (list_empty(&cm_id_priv->work_list))
900 return NULL;
901
902 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
903 list_del(&work->list);
904 return work;
905}
906
907static void cm_free_work(struct cm_work *work)
908{
909 if (work->mad_recv_wc)
910 ib_free_recv_mad(work->mad_recv_wc);
911 kfree(work);
912}
913
914static inline int cm_convert_to_ms(int iba_time)
915{
916 /* approximate conversion to ms from 4.096us x 2^iba_time */
917 return 1 << max(iba_time - 8, 0);
918}
919
920/*
921 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
922 * Because of how ack_timeout is stored, adding one doubles the timeout.
923 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
924 * increment it (round up) only if the other is within 50%.
925 */
926static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
927{
928 int ack_timeout = packet_life_time + 1;
929
930 if (ack_timeout >= ca_ack_delay)
931 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
932 else
933 ack_timeout = ca_ack_delay +
934 (ack_timeout >= (ca_ack_delay - 1));
935
936 return min(31, ack_timeout);
937}
938
939static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
940{
941 if (timewait_info->inserted_remote_id) {
942 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
943 timewait_info->inserted_remote_id = 0;
944 }
945
946 if (timewait_info->inserted_remote_qp) {
947 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
948 timewait_info->inserted_remote_qp = 0;
949 }
950}
951
952static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
953{
954 struct cm_timewait_info *timewait_info;
955
956 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
957 if (!timewait_info)
958 return ERR_PTR(-ENOMEM);
959
960 timewait_info->work.local_id = local_id;
961 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
962 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
963 return timewait_info;
964}
965
966static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
967{
968 int wait_time;
969 unsigned long flags;
970 struct cm_device *cm_dev;
971
972 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
973 if (!cm_dev)
974 return;
975
976 spin_lock_irqsave(&cm.lock, flags);
977 cm_cleanup_timewait(cm_id_priv->timewait_info);
978 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
979 spin_unlock_irqrestore(&cm.lock, flags);
980
981 /*
982 * The cm_id could be destroyed by the user before we exit timewait.
983 * To protect against this, we search for the cm_id after exiting
984 * timewait before notifying the user that we've exited timewait.
985 */
986 cm_id_priv->id.state = IB_CM_TIMEWAIT;
987 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
988
989 /* Check if the device started its remove_one */
990 spin_lock_irqsave(&cm.lock, flags);
991 if (!cm_dev->going_down)
992 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
993 msecs_to_jiffies(wait_time));
994 spin_unlock_irqrestore(&cm.lock, flags);
995
996 cm_id_priv->timewait_info = NULL;
997}
998
999static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1000{
1001 unsigned long flags;
1002
1003 cm_id_priv->id.state = IB_CM_IDLE;
1004 if (cm_id_priv->timewait_info) {
1005 spin_lock_irqsave(&cm.lock, flags);
1006 cm_cleanup_timewait(cm_id_priv->timewait_info);
1007 spin_unlock_irqrestore(&cm.lock, flags);
1008 kfree(cm_id_priv->timewait_info);
1009 cm_id_priv->timewait_info = NULL;
1010 }
1011}
1012
1013static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1014{
1015 struct cm_id_private *cm_id_priv;
1016 struct cm_work *work;
1017
1018 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1019retest:
1020 spin_lock_irq(&cm_id_priv->lock);
1021 switch (cm_id->state) {
1022 case IB_CM_LISTEN:
1023 spin_unlock_irq(&cm_id_priv->lock);
1024
1025 spin_lock_irq(&cm.lock);
1026 if (--cm_id_priv->listen_sharecount > 0) {
1027 /* The id is still shared. */
1028 cm_deref_id(cm_id_priv);
1029 spin_unlock_irq(&cm.lock);
1030 return;
1031 }
1032 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1033 spin_unlock_irq(&cm.lock);
1034 break;
1035 case IB_CM_SIDR_REQ_SENT:
1036 cm_id->state = IB_CM_IDLE;
1037 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1038 spin_unlock_irq(&cm_id_priv->lock);
1039 break;
1040 case IB_CM_SIDR_REQ_RCVD:
1041 spin_unlock_irq(&cm_id_priv->lock);
1042 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
1043 spin_lock_irq(&cm.lock);
1044 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1045 rb_erase(&cm_id_priv->sidr_id_node,
1046 &cm.remote_sidr_table);
1047 spin_unlock_irq(&cm.lock);
1048 break;
1049 case IB_CM_REQ_SENT:
1050 case IB_CM_MRA_REQ_RCVD:
1051 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1052 spin_unlock_irq(&cm_id_priv->lock);
1053 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
1054 &cm_id_priv->id.device->node_guid,
1055 sizeof cm_id_priv->id.device->node_guid,
1056 NULL, 0);
1057 break;
1058 case IB_CM_REQ_RCVD:
1059 if (err == -ENOMEM) {
1060 /* Do not reject to allow future retries. */
1061 cm_reset_to_idle(cm_id_priv);
1062 spin_unlock_irq(&cm_id_priv->lock);
1063 } else {
1064 spin_unlock_irq(&cm_id_priv->lock);
1065 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1066 NULL, 0, NULL, 0);
1067 }
1068 break;
1069 case IB_CM_REP_SENT:
1070 case IB_CM_MRA_REP_RCVD:
1071 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1072 /* Fall through */
1073 case IB_CM_MRA_REQ_SENT:
1074 case IB_CM_REP_RCVD:
1075 case IB_CM_MRA_REP_SENT:
1076 spin_unlock_irq(&cm_id_priv->lock);
1077 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1078 NULL, 0, NULL, 0);
1079 break;
1080 case IB_CM_ESTABLISHED:
1081 spin_unlock_irq(&cm_id_priv->lock);
1082 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
1083 break;
1084 ib_send_cm_dreq(cm_id, NULL, 0);
1085 goto retest;
1086 case IB_CM_DREQ_SENT:
1087 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1088 cm_enter_timewait(cm_id_priv);
1089 spin_unlock_irq(&cm_id_priv->lock);
1090 break;
1091 case IB_CM_DREQ_RCVD:
1092 spin_unlock_irq(&cm_id_priv->lock);
1093 ib_send_cm_drep(cm_id, NULL, 0);
1094 break;
1095 default:
1096 spin_unlock_irq(&cm_id_priv->lock);
1097 break;
1098 }
1099
1100 spin_lock_irq(&cm.lock);
1101 if (!list_empty(&cm_id_priv->altr_list) &&
1102 (!cm_id_priv->altr_send_port_not_ready))
1103 list_del(&cm_id_priv->altr_list);
1104 if (!list_empty(&cm_id_priv->prim_list) &&
1105 (!cm_id_priv->prim_send_port_not_ready))
1106 list_del(&cm_id_priv->prim_list);
1107 spin_unlock_irq(&cm.lock);
1108
1109 cm_free_id(cm_id->local_id);
1110 cm_deref_id(cm_id_priv);
1111 wait_for_completion(&cm_id_priv->comp);
1112 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1113 cm_free_work(work);
1114
1115 rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr);
1116 rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr);
1117 kfree(cm_id_priv->private_data);
1118 kfree(cm_id_priv);
1119}
1120
1121void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1122{
1123 cm_destroy_id(cm_id, 0);
1124}
1125EXPORT_SYMBOL(ib_destroy_cm_id);
1126
1127/**
1128 * __ib_cm_listen - Initiates listening on the specified service ID for
1129 * connection and service ID resolution requests.
1130 * @cm_id: Connection identifier associated with the listen request.
1131 * @service_id: Service identifier matched against incoming connection
1132 * and service ID resolution requests. The service ID should be specified
1133 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1134 * assign a service ID to the caller.
1135 * @service_mask: Mask applied to service ID used to listen across a
1136 * range of service IDs. If set to 0, the service ID is matched
1137 * exactly. This parameter is ignored if %service_id is set to
1138 * IB_CM_ASSIGN_SERVICE_ID.
1139 */
1140static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
1141 __be64 service_mask)
1142{
1143 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
1144 int ret = 0;
1145
1146 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
1147 service_id &= service_mask;
1148 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1149 (service_id != IB_CM_ASSIGN_SERVICE_ID))
1150 return -EINVAL;
1151
1152 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1153 if (cm_id->state != IB_CM_IDLE)
1154 return -EINVAL;
1155
1156 cm_id->state = IB_CM_LISTEN;
1157 ++cm_id_priv->listen_sharecount;
1158
1159 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
1160 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
1161 cm_id->service_mask = ~cpu_to_be64(0);
1162 } else {
1163 cm_id->service_id = service_id;
1164 cm_id->service_mask = service_mask;
1165 }
1166 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
1167
1168 if (cur_cm_id_priv) {
1169 cm_id->state = IB_CM_IDLE;
1170 --cm_id_priv->listen_sharecount;
1171 ret = -EBUSY;
1172 }
1173 return ret;
1174}
1175
1176int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
1177{
1178 unsigned long flags;
1179 int ret;
1180
1181 spin_lock_irqsave(&cm.lock, flags);
1182 ret = __ib_cm_listen(cm_id, service_id, service_mask);
1183 spin_unlock_irqrestore(&cm.lock, flags);
1184
1185 return ret;
1186}
1187EXPORT_SYMBOL(ib_cm_listen);
1188
1189/**
1190 * Create a new listening ib_cm_id and listen on the given service ID.
1191 *
1192 * If there's an existing ID listening on that same device and service ID,
1193 * return it.
1194 *
1195 * @device: Device associated with the cm_id. All related communication will
1196 * be associated with the specified device.
1197 * @cm_handler: Callback invoked to notify the user of CM events.
1198 * @service_id: Service identifier matched against incoming connection
1199 * and service ID resolution requests. The service ID should be specified
1200 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1201 * assign a service ID to the caller.
1202 *
1203 * Callers should call ib_destroy_cm_id when done with the listener ID.
1204 */
1205struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1206 ib_cm_handler cm_handler,
1207 __be64 service_id)
1208{
1209 struct cm_id_private *cm_id_priv;
1210 struct ib_cm_id *cm_id;
1211 unsigned long flags;
1212 int err = 0;
1213
1214 /* Create an ID in advance, since the creation may sleep */
1215 cm_id = ib_create_cm_id(device, cm_handler, NULL);
1216 if (IS_ERR(cm_id))
1217 return cm_id;
1218
1219 spin_lock_irqsave(&cm.lock, flags);
1220
1221 if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1222 goto new_id;
1223
1224 /* Find an existing ID */
1225 cm_id_priv = cm_find_listen(device, service_id);
1226 if (cm_id_priv) {
1227 if (cm_id->cm_handler != cm_handler || cm_id->context) {
1228 /* Sharing an ib_cm_id with different handlers is not
1229 * supported */
1230 spin_unlock_irqrestore(&cm.lock, flags);
1231 return ERR_PTR(-EINVAL);
1232 }
1233 atomic_inc(&cm_id_priv->refcount);
1234 ++cm_id_priv->listen_sharecount;
1235 spin_unlock_irqrestore(&cm.lock, flags);
1236
1237 ib_destroy_cm_id(cm_id);
1238 cm_id = &cm_id_priv->id;
1239 return cm_id;
1240 }
1241
1242new_id:
1243 /* Use newly created ID */
1244 err = __ib_cm_listen(cm_id, service_id, 0);
1245
1246 spin_unlock_irqrestore(&cm.lock, flags);
1247
1248 if (err) {
1249 ib_destroy_cm_id(cm_id);
1250 return ERR_PTR(err);
1251 }
1252 return cm_id;
1253}
1254EXPORT_SYMBOL(ib_cm_insert_listen);
1255
1256static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1257{
1258 u64 hi_tid, low_tid;
1259
1260 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1261 low_tid = (u64)cm_id_priv->id.local_id;
1262 return cpu_to_be64(hi_tid | low_tid);
1263}
1264
1265static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1266 __be16 attr_id, __be64 tid)
1267{
1268 hdr->base_version = IB_MGMT_BASE_VERSION;
1269 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1270 hdr->class_version = IB_CM_CLASS_VERSION;
1271 hdr->method = IB_MGMT_METHOD_SEND;
1272 hdr->attr_id = attr_id;
1273 hdr->tid = tid;
1274}
1275
1276static void cm_format_req(struct cm_req_msg *req_msg,
1277 struct cm_id_private *cm_id_priv,
1278 struct ib_cm_req_param *param)
1279{
1280 struct sa_path_rec *pri_path = param->primary_path;
1281 struct sa_path_rec *alt_path = param->alternate_path;
1282 bool pri_ext = false;
1283
1284 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1285 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1286 pri_path->opa.slid);
1287
1288 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1289 cm_form_tid(cm_id_priv));
1290
1291 req_msg->local_comm_id = cm_id_priv->id.local_id;
1292 req_msg->service_id = param->service_id;
1293 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1294 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1295 cm_req_set_init_depth(req_msg, param->initiator_depth);
1296 cm_req_set_remote_resp_timeout(req_msg,
1297 param->remote_cm_response_timeout);
1298 cm_req_set_qp_type(req_msg, param->qp_type);
1299 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1300 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1301 cm_req_set_local_resp_timeout(req_msg,
1302 param->local_cm_response_timeout);
1303 req_msg->pkey = param->primary_path->pkey;
1304 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1305 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1306
1307 if (param->qp_type != IB_QPT_XRC_INI) {
1308 cm_req_set_resp_res(req_msg, param->responder_resources);
1309 cm_req_set_retry_count(req_msg, param->retry_count);
1310 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1311 cm_req_set_srq(req_msg, param->srq);
1312 }
1313
1314 req_msg->primary_local_gid = pri_path->sgid;
1315 req_msg->primary_remote_gid = pri_path->dgid;
1316 if (pri_ext) {
1317 req_msg->primary_local_gid.global.interface_id
1318 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1319 req_msg->primary_remote_gid.global.interface_id
1320 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1321 }
1322 if (pri_path->hop_limit <= 1) {
1323 req_msg->primary_local_lid = pri_ext ? 0 :
1324 htons(ntohl(sa_path_get_slid(pri_path)));
1325 req_msg->primary_remote_lid = pri_ext ? 0 :
1326 htons(ntohl(sa_path_get_dlid(pri_path)));
1327 } else {
1328 /* Work-around until there's a way to obtain remote LID info */
1329 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1330 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1331 }
1332 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1333 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1334 req_msg->primary_traffic_class = pri_path->traffic_class;
1335 req_msg->primary_hop_limit = pri_path->hop_limit;
1336 cm_req_set_primary_sl(req_msg, pri_path->sl);
1337 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1338 cm_req_set_primary_local_ack_timeout(req_msg,
1339 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1340 pri_path->packet_life_time));
1341
1342 if (alt_path) {
1343 bool alt_ext = false;
1344
1345 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1346 alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1347 alt_path->opa.slid);
1348
1349 req_msg->alt_local_gid = alt_path->sgid;
1350 req_msg->alt_remote_gid = alt_path->dgid;
1351 if (alt_ext) {
1352 req_msg->alt_local_gid.global.interface_id
1353 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1354 req_msg->alt_remote_gid.global.interface_id
1355 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1356 }
1357 if (alt_path->hop_limit <= 1) {
1358 req_msg->alt_local_lid = alt_ext ? 0 :
1359 htons(ntohl(sa_path_get_slid(alt_path)));
1360 req_msg->alt_remote_lid = alt_ext ? 0 :
1361 htons(ntohl(sa_path_get_dlid(alt_path)));
1362 } else {
1363 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1364 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1365 }
1366 cm_req_set_alt_flow_label(req_msg,
1367 alt_path->flow_label);
1368 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1369 req_msg->alt_traffic_class = alt_path->traffic_class;
1370 req_msg->alt_hop_limit = alt_path->hop_limit;
1371 cm_req_set_alt_sl(req_msg, alt_path->sl);
1372 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1373 cm_req_set_alt_local_ack_timeout(req_msg,
1374 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1375 alt_path->packet_life_time));
1376 }
1377
1378 if (param->private_data && param->private_data_len)
1379 memcpy(req_msg->private_data, param->private_data,
1380 param->private_data_len);
1381}
1382
1383static int cm_validate_req_param(struct ib_cm_req_param *param)
1384{
1385 /* peer-to-peer not supported */
1386 if (param->peer_to_peer)
1387 return -EINVAL;
1388
1389 if (!param->primary_path)
1390 return -EINVAL;
1391
1392 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1393 param->qp_type != IB_QPT_XRC_INI)
1394 return -EINVAL;
1395
1396 if (param->private_data &&
1397 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1398 return -EINVAL;
1399
1400 if (param->alternate_path &&
1401 (param->alternate_path->pkey != param->primary_path->pkey ||
1402 param->alternate_path->mtu != param->primary_path->mtu))
1403 return -EINVAL;
1404
1405 return 0;
1406}
1407
1408int ib_send_cm_req(struct ib_cm_id *cm_id,
1409 struct ib_cm_req_param *param)
1410{
1411 struct cm_id_private *cm_id_priv;
1412 struct cm_req_msg *req_msg;
1413 unsigned long flags;
1414 int ret;
1415
1416 ret = cm_validate_req_param(param);
1417 if (ret)
1418 return ret;
1419
1420 /* Verify that we're not in timewait. */
1421 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1422 spin_lock_irqsave(&cm_id_priv->lock, flags);
1423 if (cm_id->state != IB_CM_IDLE) {
1424 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1425 ret = -EINVAL;
1426 goto out;
1427 }
1428 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1429
1430 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1431 id.local_id);
1432 if (IS_ERR(cm_id_priv->timewait_info)) {
1433 ret = PTR_ERR(cm_id_priv->timewait_info);
1434 goto out;
1435 }
1436
1437 ret = cm_init_av_by_path(param->primary_path,
1438 param->ppath_sgid_attr, &cm_id_priv->av,
1439 cm_id_priv);
1440 if (ret)
1441 goto error1;
1442 if (param->alternate_path) {
1443 ret = cm_init_av_by_path(param->alternate_path, NULL,
1444 &cm_id_priv->alt_av, cm_id_priv);
1445 if (ret)
1446 goto error1;
1447 }
1448 cm_id->service_id = param->service_id;
1449 cm_id->service_mask = ~cpu_to_be64(0);
1450 cm_id_priv->timeout_ms = cm_convert_to_ms(
1451 param->primary_path->packet_life_time) * 2 +
1452 cm_convert_to_ms(
1453 param->remote_cm_response_timeout);
1454 cm_id_priv->max_cm_retries = param->max_cm_retries;
1455 cm_id_priv->initiator_depth = param->initiator_depth;
1456 cm_id_priv->responder_resources = param->responder_resources;
1457 cm_id_priv->retry_count = param->retry_count;
1458 cm_id_priv->path_mtu = param->primary_path->mtu;
1459 cm_id_priv->pkey = param->primary_path->pkey;
1460 cm_id_priv->qp_type = param->qp_type;
1461
1462 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1463 if (ret)
1464 goto error1;
1465
1466 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1467 cm_format_req(req_msg, cm_id_priv, param);
1468 cm_id_priv->tid = req_msg->hdr.tid;
1469 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1470 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1471
1472 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1473 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1474
1475 spin_lock_irqsave(&cm_id_priv->lock, flags);
1476 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1477 if (ret) {
1478 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1479 goto error2;
1480 }
1481 BUG_ON(cm_id->state != IB_CM_IDLE);
1482 cm_id->state = IB_CM_REQ_SENT;
1483 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1484 return 0;
1485
1486error2: cm_free_msg(cm_id_priv->msg);
1487error1: kfree(cm_id_priv->timewait_info);
1488out: return ret;
1489}
1490EXPORT_SYMBOL(ib_send_cm_req);
1491
1492static int cm_issue_rej(struct cm_port *port,
1493 struct ib_mad_recv_wc *mad_recv_wc,
1494 enum ib_cm_rej_reason reason,
1495 enum cm_msg_response msg_rejected,
1496 void *ari, u8 ari_length)
1497{
1498 struct ib_mad_send_buf *msg = NULL;
1499 struct cm_rej_msg *rej_msg, *rcv_msg;
1500 int ret;
1501
1502 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1503 if (ret)
1504 return ret;
1505
1506 /* We just need common CM header information. Cast to any message. */
1507 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1508 rej_msg = (struct cm_rej_msg *) msg->mad;
1509
1510 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1511 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1512 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1513 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1514 rej_msg->reason = cpu_to_be16(reason);
1515
1516 if (ari && ari_length) {
1517 cm_rej_set_reject_info_len(rej_msg, ari_length);
1518 memcpy(rej_msg->ari, ari, ari_length);
1519 }
1520
1521 ret = ib_post_send_mad(msg, NULL);
1522 if (ret)
1523 cm_free_msg(msg);
1524
1525 return ret;
1526}
1527
1528static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1529 __be32 local_qpn, __be32 remote_qpn)
1530{
1531 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1532 ((local_ca_guid == remote_ca_guid) &&
1533 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1534}
1535
1536static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1537{
1538 return ((req_msg->alt_local_lid) ||
1539 (ib_is_opa_gid(&req_msg->alt_local_gid)));
1540}
1541
1542static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num,
1543 struct sa_path_rec *path, union ib_gid *gid)
1544{
1545 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1546 path->rec_type = SA_PATH_REC_TYPE_OPA;
1547 else
1548 path->rec_type = SA_PATH_REC_TYPE_IB;
1549}
1550
1551static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1552 struct sa_path_rec *primary_path,
1553 struct sa_path_rec *alt_path)
1554{
1555 u32 lid;
1556
1557 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1558 sa_path_set_dlid(primary_path,
1559 ntohs(req_msg->primary_local_lid));
1560 sa_path_set_slid(primary_path,
1561 ntohs(req_msg->primary_remote_lid));
1562 } else {
1563 lid = opa_get_lid_from_gid(&req_msg->primary_local_gid);
1564 sa_path_set_dlid(primary_path, lid);
1565
1566 lid = opa_get_lid_from_gid(&req_msg->primary_remote_gid);
1567 sa_path_set_slid(primary_path, lid);
1568 }
1569
1570 if (!cm_req_has_alt_path(req_msg))
1571 return;
1572
1573 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1574 sa_path_set_dlid(alt_path, ntohs(req_msg->alt_local_lid));
1575 sa_path_set_slid(alt_path, ntohs(req_msg->alt_remote_lid));
1576 } else {
1577 lid = opa_get_lid_from_gid(&req_msg->alt_local_gid);
1578 sa_path_set_dlid(alt_path, lid);
1579
1580 lid = opa_get_lid_from_gid(&req_msg->alt_remote_gid);
1581 sa_path_set_slid(alt_path, lid);
1582 }
1583}
1584
1585static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1586 struct sa_path_rec *primary_path,
1587 struct sa_path_rec *alt_path)
1588{
1589 primary_path->dgid = req_msg->primary_local_gid;
1590 primary_path->sgid = req_msg->primary_remote_gid;
1591 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1592 primary_path->hop_limit = req_msg->primary_hop_limit;
1593 primary_path->traffic_class = req_msg->primary_traffic_class;
1594 primary_path->reversible = 1;
1595 primary_path->pkey = req_msg->pkey;
1596 primary_path->sl = cm_req_get_primary_sl(req_msg);
1597 primary_path->mtu_selector = IB_SA_EQ;
1598 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1599 primary_path->rate_selector = IB_SA_EQ;
1600 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1601 primary_path->packet_life_time_selector = IB_SA_EQ;
1602 primary_path->packet_life_time =
1603 cm_req_get_primary_local_ack_timeout(req_msg);
1604 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1605 primary_path->service_id = req_msg->service_id;
1606 if (sa_path_is_roce(primary_path))
1607 primary_path->roce.route_resolved = false;
1608
1609 if (cm_req_has_alt_path(req_msg)) {
1610 alt_path->dgid = req_msg->alt_local_gid;
1611 alt_path->sgid = req_msg->alt_remote_gid;
1612 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1613 alt_path->hop_limit = req_msg->alt_hop_limit;
1614 alt_path->traffic_class = req_msg->alt_traffic_class;
1615 alt_path->reversible = 1;
1616 alt_path->pkey = req_msg->pkey;
1617 alt_path->sl = cm_req_get_alt_sl(req_msg);
1618 alt_path->mtu_selector = IB_SA_EQ;
1619 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1620 alt_path->rate_selector = IB_SA_EQ;
1621 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1622 alt_path->packet_life_time_selector = IB_SA_EQ;
1623 alt_path->packet_life_time =
1624 cm_req_get_alt_local_ack_timeout(req_msg);
1625 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1626 alt_path->service_id = req_msg->service_id;
1627
1628 if (sa_path_is_roce(alt_path))
1629 alt_path->roce.route_resolved = false;
1630 }
1631 cm_format_path_lid_from_req(req_msg, primary_path, alt_path);
1632}
1633
1634static u16 cm_get_bth_pkey(struct cm_work *work)
1635{
1636 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1637 u8 port_num = work->port->port_num;
1638 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1639 u16 pkey;
1640 int ret;
1641
1642 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1643 if (ret) {
1644 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1645 port_num, pkey_index, ret);
1646 return 0;
1647 }
1648
1649 return pkey;
1650}
1651
1652/**
1653 * Convert OPA SGID to IB SGID
1654 * ULPs (such as IPoIB) do not understand OPA GIDs and will
1655 * reject them as the local_gid will not match the sgid. Therefore,
1656 * change the pathrec's SGID to an IB SGID.
1657 *
1658 * @work: Work completion
1659 * @path: Path record
1660 */
1661static void cm_opa_to_ib_sgid(struct cm_work *work,
1662 struct sa_path_rec *path)
1663{
1664 struct ib_device *dev = work->port->cm_dev->ib_device;
1665 u8 port_num = work->port->port_num;
1666
1667 if (rdma_cap_opa_ah(dev, port_num) &&
1668 (ib_is_opa_gid(&path->sgid))) {
1669 union ib_gid sgid;
1670
1671 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1672 dev_warn(&dev->dev,
1673 "Error updating sgid in CM request\n");
1674 return;
1675 }
1676
1677 path->sgid = sgid;
1678 }
1679}
1680
1681static void cm_format_req_event(struct cm_work *work,
1682 struct cm_id_private *cm_id_priv,
1683 struct ib_cm_id *listen_id)
1684{
1685 struct cm_req_msg *req_msg;
1686 struct ib_cm_req_event_param *param;
1687
1688 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1689 param = &work->cm_event.param.req_rcvd;
1690 param->listen_id = listen_id;
1691 param->bth_pkey = cm_get_bth_pkey(work);
1692 param->port = cm_id_priv->av.port->port_num;
1693 param->primary_path = &work->path[0];
1694 cm_opa_to_ib_sgid(work, param->primary_path);
1695 if (cm_req_has_alt_path(req_msg)) {
1696 param->alternate_path = &work->path[1];
1697 cm_opa_to_ib_sgid(work, param->alternate_path);
1698 } else {
1699 param->alternate_path = NULL;
1700 }
1701 param->remote_ca_guid = req_msg->local_ca_guid;
1702 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1703 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1704 param->qp_type = cm_req_get_qp_type(req_msg);
1705 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1706 param->responder_resources = cm_req_get_init_depth(req_msg);
1707 param->initiator_depth = cm_req_get_resp_res(req_msg);
1708 param->local_cm_response_timeout =
1709 cm_req_get_remote_resp_timeout(req_msg);
1710 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1711 param->remote_cm_response_timeout =
1712 cm_req_get_local_resp_timeout(req_msg);
1713 param->retry_count = cm_req_get_retry_count(req_msg);
1714 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1715 param->srq = cm_req_get_srq(req_msg);
1716 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1717 work->cm_event.private_data = &req_msg->private_data;
1718}
1719
1720static void cm_process_work(struct cm_id_private *cm_id_priv,
1721 struct cm_work *work)
1722{
1723 int ret;
1724
1725 /* We will typically only have the current event to report. */
1726 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1727 cm_free_work(work);
1728
1729 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1730 spin_lock_irq(&cm_id_priv->lock);
1731 work = cm_dequeue_work(cm_id_priv);
1732 spin_unlock_irq(&cm_id_priv->lock);
1733 if (!work)
1734 return;
1735
1736 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1737 &work->cm_event);
1738 cm_free_work(work);
1739 }
1740 cm_deref_id(cm_id_priv);
1741 if (ret)
1742 cm_destroy_id(&cm_id_priv->id, ret);
1743}
1744
1745static void cm_format_mra(struct cm_mra_msg *mra_msg,
1746 struct cm_id_private *cm_id_priv,
1747 enum cm_msg_response msg_mraed, u8 service_timeout,
1748 const void *private_data, u8 private_data_len)
1749{
1750 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1751 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1752 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1753 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1754 cm_mra_set_service_timeout(mra_msg, service_timeout);
1755
1756 if (private_data && private_data_len)
1757 memcpy(mra_msg->private_data, private_data, private_data_len);
1758}
1759
1760static void cm_format_rej(struct cm_rej_msg *rej_msg,
1761 struct cm_id_private *cm_id_priv,
1762 enum ib_cm_rej_reason reason,
1763 void *ari,
1764 u8 ari_length,
1765 const void *private_data,
1766 u8 private_data_len)
1767{
1768 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1769 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1770
1771 switch(cm_id_priv->id.state) {
1772 case IB_CM_REQ_RCVD:
1773 rej_msg->local_comm_id = 0;
1774 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1775 break;
1776 case IB_CM_MRA_REQ_SENT:
1777 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1778 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1779 break;
1780 case IB_CM_REP_RCVD:
1781 case IB_CM_MRA_REP_SENT:
1782 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1783 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1784 break;
1785 default:
1786 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1787 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1788 break;
1789 }
1790
1791 rej_msg->reason = cpu_to_be16(reason);
1792 if (ari && ari_length) {
1793 cm_rej_set_reject_info_len(rej_msg, ari_length);
1794 memcpy(rej_msg->ari, ari, ari_length);
1795 }
1796
1797 if (private_data && private_data_len)
1798 memcpy(rej_msg->private_data, private_data, private_data_len);
1799}
1800
1801static void cm_dup_req_handler(struct cm_work *work,
1802 struct cm_id_private *cm_id_priv)
1803{
1804 struct ib_mad_send_buf *msg = NULL;
1805 int ret;
1806
1807 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1808 counter[CM_REQ_COUNTER]);
1809
1810 /* Quick state check to discard duplicate REQs. */
1811 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1812 return;
1813
1814 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1815 if (ret)
1816 return;
1817
1818 spin_lock_irq(&cm_id_priv->lock);
1819 switch (cm_id_priv->id.state) {
1820 case IB_CM_MRA_REQ_SENT:
1821 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1822 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1823 cm_id_priv->private_data,
1824 cm_id_priv->private_data_len);
1825 break;
1826 case IB_CM_TIMEWAIT:
1827 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1828 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1829 break;
1830 default:
1831 goto unlock;
1832 }
1833 spin_unlock_irq(&cm_id_priv->lock);
1834
1835 ret = ib_post_send_mad(msg, NULL);
1836 if (ret)
1837 goto free;
1838 return;
1839
1840unlock: spin_unlock_irq(&cm_id_priv->lock);
1841free: cm_free_msg(msg);
1842}
1843
1844static struct cm_id_private * cm_match_req(struct cm_work *work,
1845 struct cm_id_private *cm_id_priv)
1846{
1847 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1848 struct cm_timewait_info *timewait_info;
1849 struct cm_req_msg *req_msg;
1850 struct ib_cm_id *cm_id;
1851
1852 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1853
1854 /* Check for possible duplicate REQ. */
1855 spin_lock_irq(&cm.lock);
1856 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1857 if (timewait_info) {
1858 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1859 timewait_info->work.remote_id);
1860 spin_unlock_irq(&cm.lock);
1861 if (cur_cm_id_priv) {
1862 cm_dup_req_handler(work, cur_cm_id_priv);
1863 cm_deref_id(cur_cm_id_priv);
1864 }
1865 return NULL;
1866 }
1867
1868 /* Check for stale connections. */
1869 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1870 if (timewait_info) {
1871 cm_cleanup_timewait(cm_id_priv->timewait_info);
1872 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1873 timewait_info->work.remote_id);
1874
1875 spin_unlock_irq(&cm.lock);
1876 cm_issue_rej(work->port, work->mad_recv_wc,
1877 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1878 NULL, 0);
1879 if (cur_cm_id_priv) {
1880 cm_id = &cur_cm_id_priv->id;
1881 ib_send_cm_dreq(cm_id, NULL, 0);
1882 cm_deref_id(cur_cm_id_priv);
1883 }
1884 return NULL;
1885 }
1886
1887 /* Find matching listen request. */
1888 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1889 req_msg->service_id);
1890 if (!listen_cm_id_priv) {
1891 cm_cleanup_timewait(cm_id_priv->timewait_info);
1892 spin_unlock_irq(&cm.lock);
1893 cm_issue_rej(work->port, work->mad_recv_wc,
1894 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1895 NULL, 0);
1896 goto out;
1897 }
1898 atomic_inc(&listen_cm_id_priv->refcount);
1899 atomic_inc(&cm_id_priv->refcount);
1900 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1901 atomic_inc(&cm_id_priv->work_count);
1902 spin_unlock_irq(&cm.lock);
1903out:
1904 return listen_cm_id_priv;
1905}
1906
1907/*
1908 * Work-around for inter-subnet connections. If the LIDs are permissive,
1909 * we need to override the LID/SL data in the REQ with the LID information
1910 * in the work completion.
1911 */
1912static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1913{
1914 if (!cm_req_get_primary_subnet_local(req_msg)) {
1915 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1916 req_msg->primary_local_lid = ib_lid_be16(wc->slid);
1917 cm_req_set_primary_sl(req_msg, wc->sl);
1918 }
1919
1920 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1921 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1922 }
1923
1924 if (!cm_req_get_alt_subnet_local(req_msg)) {
1925 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1926 req_msg->alt_local_lid = ib_lid_be16(wc->slid);
1927 cm_req_set_alt_sl(req_msg, wc->sl);
1928 }
1929
1930 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1931 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1932 }
1933}
1934
1935static int cm_req_handler(struct cm_work *work)
1936{
1937 struct ib_cm_id *cm_id;
1938 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1939 struct cm_req_msg *req_msg;
1940 const struct ib_global_route *grh;
1941 const struct ib_gid_attr *gid_attr;
1942 int ret;
1943
1944 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1945
1946 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1947 if (IS_ERR(cm_id))
1948 return PTR_ERR(cm_id);
1949
1950 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1951 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1952 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1953 work->mad_recv_wc->recv_buf.grh,
1954 &cm_id_priv->av);
1955 if (ret)
1956 goto destroy;
1957 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1958 id.local_id);
1959 if (IS_ERR(cm_id_priv->timewait_info)) {
1960 ret = PTR_ERR(cm_id_priv->timewait_info);
1961 goto destroy;
1962 }
1963 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1964 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1965 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1966
1967 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1968 if (!listen_cm_id_priv) {
1969 pr_debug("%s: local_id %d, no listen_cm_id_priv\n", __func__,
1970 be32_to_cpu(cm_id->local_id));
1971 ret = -EINVAL;
1972 goto free_timeinfo;
1973 }
1974
1975 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1976 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1977 cm_id_priv->id.service_id = req_msg->service_id;
1978 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1979
1980 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1981
1982 memset(&work->path[0], 0, sizeof(work->path[0]));
1983 if (cm_req_has_alt_path(req_msg))
1984 memset(&work->path[1], 0, sizeof(work->path[1]));
1985 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
1986 gid_attr = grh->sgid_attr;
1987
1988 if (gid_attr &&
1989 rdma_protocol_roce(work->port->cm_dev->ib_device,
1990 work->port->port_num)) {
1991 work->path[0].rec_type =
1992 sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
1993 } else {
1994 cm_path_set_rec_type(work->port->cm_dev->ib_device,
1995 work->port->port_num,
1996 &work->path[0],
1997 &req_msg->primary_local_gid);
1998 }
1999 if (cm_req_has_alt_path(req_msg))
2000 work->path[1].rec_type = work->path[0].rec_type;
2001 cm_format_paths_from_req(req_msg, &work->path[0],
2002 &work->path[1]);
2003 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2004 sa_path_set_dmac(&work->path[0],
2005 cm_id_priv->av.ah_attr.roce.dmac);
2006 work->path[0].hop_limit = grh->hop_limit;
2007 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av,
2008 cm_id_priv);
2009 if (ret) {
2010 int err;
2011
2012 err = rdma_query_gid(work->port->cm_dev->ib_device,
2013 work->port->port_num, 0,
2014 &work->path[0].sgid);
2015 if (err)
2016 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
2017 NULL, 0, NULL, 0);
2018 else
2019 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
2020 &work->path[0].sgid,
2021 sizeof(work->path[0].sgid),
2022 NULL, 0);
2023 goto rejected;
2024 }
2025 if (cm_req_has_alt_path(req_msg)) {
2026 ret = cm_init_av_by_path(&work->path[1], NULL,
2027 &cm_id_priv->alt_av, cm_id_priv);
2028 if (ret) {
2029 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
2030 &work->path[0].sgid,
2031 sizeof(work->path[0].sgid), NULL, 0);
2032 goto rejected;
2033 }
2034 }
2035 cm_id_priv->tid = req_msg->hdr.tid;
2036 cm_id_priv->timeout_ms = cm_convert_to_ms(
2037 cm_req_get_local_resp_timeout(req_msg));
2038 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
2039 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
2040 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
2041 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
2042 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
2043 cm_id_priv->pkey = req_msg->pkey;
2044 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
2045 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
2046 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
2047 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2048
2049 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2050 cm_process_work(cm_id_priv, work);
2051 cm_deref_id(listen_cm_id_priv);
2052 return 0;
2053
2054rejected:
2055 atomic_dec(&cm_id_priv->refcount);
2056 cm_deref_id(listen_cm_id_priv);
2057free_timeinfo:
2058 kfree(cm_id_priv->timewait_info);
2059destroy:
2060 ib_destroy_cm_id(cm_id);
2061 return ret;
2062}
2063
2064static void cm_format_rep(struct cm_rep_msg *rep_msg,
2065 struct cm_id_private *cm_id_priv,
2066 struct ib_cm_rep_param *param)
2067{
2068 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
2069 rep_msg->local_comm_id = cm_id_priv->id.local_id;
2070 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2071 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
2072 rep_msg->resp_resources = param->responder_resources;
2073 cm_rep_set_target_ack_delay(rep_msg,
2074 cm_id_priv->av.port->cm_dev->ack_delay);
2075 cm_rep_set_failover(rep_msg, param->failover_accepted);
2076 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
2077 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
2078
2079 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2080 rep_msg->initiator_depth = param->initiator_depth;
2081 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
2082 cm_rep_set_srq(rep_msg, param->srq);
2083 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
2084 } else {
2085 cm_rep_set_srq(rep_msg, 1);
2086 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
2087 }
2088
2089 if (param->private_data && param->private_data_len)
2090 memcpy(rep_msg->private_data, param->private_data,
2091 param->private_data_len);
2092}
2093
2094int ib_send_cm_rep(struct ib_cm_id *cm_id,
2095 struct ib_cm_rep_param *param)
2096{
2097 struct cm_id_private *cm_id_priv;
2098 struct ib_mad_send_buf *msg;
2099 struct cm_rep_msg *rep_msg;
2100 unsigned long flags;
2101 int ret;
2102
2103 if (param->private_data &&
2104 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2105 return -EINVAL;
2106
2107 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2108 spin_lock_irqsave(&cm_id_priv->lock, flags);
2109 if (cm_id->state != IB_CM_REQ_RCVD &&
2110 cm_id->state != IB_CM_MRA_REQ_SENT) {
2111 pr_debug("%s: local_comm_id %d, cm_id->state: %d\n", __func__,
2112 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2113 ret = -EINVAL;
2114 goto out;
2115 }
2116
2117 ret = cm_alloc_msg(cm_id_priv, &msg);
2118 if (ret)
2119 goto out;
2120
2121 rep_msg = (struct cm_rep_msg *) msg->mad;
2122 cm_format_rep(rep_msg, cm_id_priv, param);
2123 msg->timeout_ms = cm_id_priv->timeout_ms;
2124 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2125
2126 ret = ib_post_send_mad(msg, NULL);
2127 if (ret) {
2128 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2129 cm_free_msg(msg);
2130 return ret;
2131 }
2132
2133 cm_id->state = IB_CM_REP_SENT;
2134 cm_id_priv->msg = msg;
2135 cm_id_priv->initiator_depth = param->initiator_depth;
2136 cm_id_priv->responder_resources = param->responder_resources;
2137 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
2138 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2139
2140out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2141 return ret;
2142}
2143EXPORT_SYMBOL(ib_send_cm_rep);
2144
2145static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2146 struct cm_id_private *cm_id_priv,
2147 const void *private_data,
2148 u8 private_data_len)
2149{
2150 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2151 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
2152 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
2153
2154 if (private_data && private_data_len)
2155 memcpy(rtu_msg->private_data, private_data, private_data_len);
2156}
2157
2158int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2159 const void *private_data,
2160 u8 private_data_len)
2161{
2162 struct cm_id_private *cm_id_priv;
2163 struct ib_mad_send_buf *msg;
2164 unsigned long flags;
2165 void *data;
2166 int ret;
2167
2168 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2169 return -EINVAL;
2170
2171 data = cm_copy_private_data(private_data, private_data_len);
2172 if (IS_ERR(data))
2173 return PTR_ERR(data);
2174
2175 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2176 spin_lock_irqsave(&cm_id_priv->lock, flags);
2177 if (cm_id->state != IB_CM_REP_RCVD &&
2178 cm_id->state != IB_CM_MRA_REP_SENT) {
2179 pr_debug("%s: local_id %d, cm_id->state %d\n", __func__,
2180 be32_to_cpu(cm_id->local_id), cm_id->state);
2181 ret = -EINVAL;
2182 goto error;
2183 }
2184
2185 ret = cm_alloc_msg(cm_id_priv, &msg);
2186 if (ret)
2187 goto error;
2188
2189 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2190 private_data, private_data_len);
2191
2192 ret = ib_post_send_mad(msg, NULL);
2193 if (ret) {
2194 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2195 cm_free_msg(msg);
2196 kfree(data);
2197 return ret;
2198 }
2199
2200 cm_id->state = IB_CM_ESTABLISHED;
2201 cm_set_private_data(cm_id_priv, data, private_data_len);
2202 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2203 return 0;
2204
2205error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2206 kfree(data);
2207 return ret;
2208}
2209EXPORT_SYMBOL(ib_send_cm_rtu);
2210
2211static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2212{
2213 struct cm_rep_msg *rep_msg;
2214 struct ib_cm_rep_event_param *param;
2215
2216 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2217 param = &work->cm_event.param.rep_rcvd;
2218 param->remote_ca_guid = rep_msg->local_ca_guid;
2219 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
2220 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2221 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
2222 param->responder_resources = rep_msg->initiator_depth;
2223 param->initiator_depth = rep_msg->resp_resources;
2224 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
2225 param->failover_accepted = cm_rep_get_failover(rep_msg);
2226 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
2227 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
2228 param->srq = cm_rep_get_srq(rep_msg);
2229 work->cm_event.private_data = &rep_msg->private_data;
2230}
2231
2232static void cm_dup_rep_handler(struct cm_work *work)
2233{
2234 struct cm_id_private *cm_id_priv;
2235 struct cm_rep_msg *rep_msg;
2236 struct ib_mad_send_buf *msg = NULL;
2237 int ret;
2238
2239 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2240 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
2241 rep_msg->local_comm_id);
2242 if (!cm_id_priv)
2243 return;
2244
2245 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2246 counter[CM_REP_COUNTER]);
2247 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2248 if (ret)
2249 goto deref;
2250
2251 spin_lock_irq(&cm_id_priv->lock);
2252 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2253 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2254 cm_id_priv->private_data,
2255 cm_id_priv->private_data_len);
2256 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2257 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2258 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2259 cm_id_priv->private_data,
2260 cm_id_priv->private_data_len);
2261 else
2262 goto unlock;
2263 spin_unlock_irq(&cm_id_priv->lock);
2264
2265 ret = ib_post_send_mad(msg, NULL);
2266 if (ret)
2267 goto free;
2268 goto deref;
2269
2270unlock: spin_unlock_irq(&cm_id_priv->lock);
2271free: cm_free_msg(msg);
2272deref: cm_deref_id(cm_id_priv);
2273}
2274
2275static int cm_rep_handler(struct cm_work *work)
2276{
2277 struct cm_id_private *cm_id_priv;
2278 struct cm_rep_msg *rep_msg;
2279 int ret;
2280 struct cm_id_private *cur_cm_id_priv;
2281 struct ib_cm_id *cm_id;
2282 struct cm_timewait_info *timewait_info;
2283
2284 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2285 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
2286 if (!cm_id_priv) {
2287 cm_dup_rep_handler(work);
2288 pr_debug("%s: remote_comm_id %d, no cm_id_priv\n", __func__,
2289 be32_to_cpu(rep_msg->remote_comm_id));
2290 return -EINVAL;
2291 }
2292
2293 cm_format_rep_event(work, cm_id_priv->qp_type);
2294
2295 spin_lock_irq(&cm_id_priv->lock);
2296 switch (cm_id_priv->id.state) {
2297 case IB_CM_REQ_SENT:
2298 case IB_CM_MRA_REQ_RCVD:
2299 break;
2300 default:
2301 spin_unlock_irq(&cm_id_priv->lock);
2302 ret = -EINVAL;
2303 pr_debug("%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n",
2304 __func__, cm_id_priv->id.state,
2305 be32_to_cpu(rep_msg->local_comm_id),
2306 be32_to_cpu(rep_msg->remote_comm_id));
2307 goto error;
2308 }
2309
2310 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
2311 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
2312 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2313
2314 spin_lock(&cm.lock);
2315 /* Check for duplicate REP. */
2316 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2317 spin_unlock(&cm.lock);
2318 spin_unlock_irq(&cm_id_priv->lock);
2319 ret = -EINVAL;
2320 pr_debug("%s: Failed to insert remote id %d\n", __func__,
2321 be32_to_cpu(rep_msg->remote_comm_id));
2322 goto error;
2323 }
2324 /* Check for a stale connection. */
2325 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2326 if (timewait_info) {
2327 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
2328 &cm.remote_id_table);
2329 cm_id_priv->timewait_info->inserted_remote_id = 0;
2330 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
2331 timewait_info->work.remote_id);
2332
2333 spin_unlock(&cm.lock);
2334 spin_unlock_irq(&cm_id_priv->lock);
2335 cm_issue_rej(work->port, work->mad_recv_wc,
2336 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2337 NULL, 0);
2338 ret = -EINVAL;
2339 pr_debug("%s: Stale connection. local_comm_id %d, remote_comm_id %d\n",
2340 __func__, be32_to_cpu(rep_msg->local_comm_id),
2341 be32_to_cpu(rep_msg->remote_comm_id));
2342
2343 if (cur_cm_id_priv) {
2344 cm_id = &cur_cm_id_priv->id;
2345 ib_send_cm_dreq(cm_id, NULL, 0);
2346 cm_deref_id(cur_cm_id_priv);
2347 }
2348
2349 goto error;
2350 }
2351 spin_unlock(&cm.lock);
2352
2353 cm_id_priv->id.state = IB_CM_REP_RCVD;
2354 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
2355 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2356 cm_id_priv->initiator_depth = rep_msg->resp_resources;
2357 cm_id_priv->responder_resources = rep_msg->initiator_depth;
2358 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
2359 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
2360 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
2361 cm_id_priv->av.timeout =
2362 cm_ack_timeout(cm_id_priv->target_ack_delay,
2363 cm_id_priv->av.timeout - 1);
2364 cm_id_priv->alt_av.timeout =
2365 cm_ack_timeout(cm_id_priv->target_ack_delay,
2366 cm_id_priv->alt_av.timeout - 1);
2367
2368 /* todo: handle peer_to_peer */
2369
2370 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2371 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2372 if (!ret)
2373 list_add_tail(&work->list, &cm_id_priv->work_list);
2374 spin_unlock_irq(&cm_id_priv->lock);
2375
2376 if (ret)
2377 cm_process_work(cm_id_priv, work);
2378 else
2379 cm_deref_id(cm_id_priv);
2380 return 0;
2381
2382error:
2383 cm_deref_id(cm_id_priv);
2384 return ret;
2385}
2386
2387static int cm_establish_handler(struct cm_work *work)
2388{
2389 struct cm_id_private *cm_id_priv;
2390 int ret;
2391
2392 /* See comment in cm_establish about lookup. */
2393 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2394 if (!cm_id_priv)
2395 return -EINVAL;
2396
2397 spin_lock_irq(&cm_id_priv->lock);
2398 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2399 spin_unlock_irq(&cm_id_priv->lock);
2400 goto out;
2401 }
2402
2403 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2404 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2405 if (!ret)
2406 list_add_tail(&work->list, &cm_id_priv->work_list);
2407 spin_unlock_irq(&cm_id_priv->lock);
2408
2409 if (ret)
2410 cm_process_work(cm_id_priv, work);
2411 else
2412 cm_deref_id(cm_id_priv);
2413 return 0;
2414out:
2415 cm_deref_id(cm_id_priv);
2416 return -EINVAL;
2417}
2418
2419static int cm_rtu_handler(struct cm_work *work)
2420{
2421 struct cm_id_private *cm_id_priv;
2422 struct cm_rtu_msg *rtu_msg;
2423 int ret;
2424
2425 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2426 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
2427 rtu_msg->local_comm_id);
2428 if (!cm_id_priv)
2429 return -EINVAL;
2430
2431 work->cm_event.private_data = &rtu_msg->private_data;
2432
2433 spin_lock_irq(&cm_id_priv->lock);
2434 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2435 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2436 spin_unlock_irq(&cm_id_priv->lock);
2437 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2438 counter[CM_RTU_COUNTER]);
2439 goto out;
2440 }
2441 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2442
2443 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2444 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2445 if (!ret)
2446 list_add_tail(&work->list, &cm_id_priv->work_list);
2447 spin_unlock_irq(&cm_id_priv->lock);
2448
2449 if (ret)
2450 cm_process_work(cm_id_priv, work);
2451 else
2452 cm_deref_id(cm_id_priv);
2453 return 0;
2454out:
2455 cm_deref_id(cm_id_priv);
2456 return -EINVAL;
2457}
2458
2459static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2460 struct cm_id_private *cm_id_priv,
2461 const void *private_data,
2462 u8 private_data_len)
2463{
2464 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2465 cm_form_tid(cm_id_priv));
2466 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
2467 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
2468 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
2469
2470 if (private_data && private_data_len)
2471 memcpy(dreq_msg->private_data, private_data, private_data_len);
2472}
2473
2474int ib_send_cm_dreq(struct ib_cm_id *cm_id,
2475 const void *private_data,
2476 u8 private_data_len)
2477{
2478 struct cm_id_private *cm_id_priv;
2479 struct ib_mad_send_buf *msg;
2480 unsigned long flags;
2481 int ret;
2482
2483 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2484 return -EINVAL;
2485
2486 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2487 spin_lock_irqsave(&cm_id_priv->lock, flags);
2488 if (cm_id->state != IB_CM_ESTABLISHED) {
2489 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2490 be32_to_cpu(cm_id->local_id), cm_id->state);
2491 ret = -EINVAL;
2492 goto out;
2493 }
2494
2495 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2496 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2497 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2498
2499 ret = cm_alloc_msg(cm_id_priv, &msg);
2500 if (ret) {
2501 cm_enter_timewait(cm_id_priv);
2502 goto out;
2503 }
2504
2505 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2506 private_data, private_data_len);
2507 msg->timeout_ms = cm_id_priv->timeout_ms;
2508 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2509
2510 ret = ib_post_send_mad(msg, NULL);
2511 if (ret) {
2512 cm_enter_timewait(cm_id_priv);
2513 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2514 cm_free_msg(msg);
2515 return ret;
2516 }
2517
2518 cm_id->state = IB_CM_DREQ_SENT;
2519 cm_id_priv->msg = msg;
2520out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2521 return ret;
2522}
2523EXPORT_SYMBOL(ib_send_cm_dreq);
2524
2525static void cm_format_drep(struct cm_drep_msg *drep_msg,
2526 struct cm_id_private *cm_id_priv,
2527 const void *private_data,
2528 u8 private_data_len)
2529{
2530 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2531 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2532 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2533
2534 if (private_data && private_data_len)
2535 memcpy(drep_msg->private_data, private_data, private_data_len);
2536}
2537
2538int ib_send_cm_drep(struct ib_cm_id *cm_id,
2539 const void *private_data,
2540 u8 private_data_len)
2541{
2542 struct cm_id_private *cm_id_priv;
2543 struct ib_mad_send_buf *msg;
2544 unsigned long flags;
2545 void *data;
2546 int ret;
2547
2548 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2549 return -EINVAL;
2550
2551 data = cm_copy_private_data(private_data, private_data_len);
2552 if (IS_ERR(data))
2553 return PTR_ERR(data);
2554
2555 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2556 spin_lock_irqsave(&cm_id_priv->lock, flags);
2557 if (cm_id->state != IB_CM_DREQ_RCVD) {
2558 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2559 kfree(data);
2560 pr_debug("%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n",
2561 __func__, be32_to_cpu(cm_id->local_id), cm_id->state);
2562 return -EINVAL;
2563 }
2564
2565 cm_set_private_data(cm_id_priv, data, private_data_len);
2566 cm_enter_timewait(cm_id_priv);
2567
2568 ret = cm_alloc_msg(cm_id_priv, &msg);
2569 if (ret)
2570 goto out;
2571
2572 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2573 private_data, private_data_len);
2574
2575 ret = ib_post_send_mad(msg, NULL);
2576 if (ret) {
2577 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2578 cm_free_msg(msg);
2579 return ret;
2580 }
2581
2582out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2583 return ret;
2584}
2585EXPORT_SYMBOL(ib_send_cm_drep);
2586
2587static int cm_issue_drep(struct cm_port *port,
2588 struct ib_mad_recv_wc *mad_recv_wc)
2589{
2590 struct ib_mad_send_buf *msg = NULL;
2591 struct cm_dreq_msg *dreq_msg;
2592 struct cm_drep_msg *drep_msg;
2593 int ret;
2594
2595 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2596 if (ret)
2597 return ret;
2598
2599 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2600 drep_msg = (struct cm_drep_msg *) msg->mad;
2601
2602 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2603 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2604 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2605
2606 ret = ib_post_send_mad(msg, NULL);
2607 if (ret)
2608 cm_free_msg(msg);
2609
2610 return ret;
2611}
2612
2613static int cm_dreq_handler(struct cm_work *work)
2614{
2615 struct cm_id_private *cm_id_priv;
2616 struct cm_dreq_msg *dreq_msg;
2617 struct ib_mad_send_buf *msg = NULL;
2618 int ret;
2619
2620 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2621 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2622 dreq_msg->local_comm_id);
2623 if (!cm_id_priv) {
2624 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2625 counter[CM_DREQ_COUNTER]);
2626 cm_issue_drep(work->port, work->mad_recv_wc);
2627 pr_debug("%s: no cm_id_priv, local_comm_id %d, remote_comm_id %d\n",
2628 __func__, be32_to_cpu(dreq_msg->local_comm_id),
2629 be32_to_cpu(dreq_msg->remote_comm_id));
2630 return -EINVAL;
2631 }
2632
2633 work->cm_event.private_data = &dreq_msg->private_data;
2634
2635 spin_lock_irq(&cm_id_priv->lock);
2636 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2637 goto unlock;
2638
2639 switch (cm_id_priv->id.state) {
2640 case IB_CM_REP_SENT:
2641 case IB_CM_DREQ_SENT:
2642 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2643 break;
2644 case IB_CM_ESTABLISHED:
2645 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2646 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2647 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2648 break;
2649 case IB_CM_MRA_REP_RCVD:
2650 break;
2651 case IB_CM_TIMEWAIT:
2652 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2653 counter[CM_DREQ_COUNTER]);
2654 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2655 if (IS_ERR(msg))
2656 goto unlock;
2657
2658 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2659 cm_id_priv->private_data,
2660 cm_id_priv->private_data_len);
2661 spin_unlock_irq(&cm_id_priv->lock);
2662
2663 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2664 ib_post_send_mad(msg, NULL))
2665 cm_free_msg(msg);
2666 goto deref;
2667 case IB_CM_DREQ_RCVD:
2668 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2669 counter[CM_DREQ_COUNTER]);
2670 goto unlock;
2671 default:
2672 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2673 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2674 cm_id_priv->id.state);
2675 goto unlock;
2676 }
2677 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2678 cm_id_priv->tid = dreq_msg->hdr.tid;
2679 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2680 if (!ret)
2681 list_add_tail(&work->list, &cm_id_priv->work_list);
2682 spin_unlock_irq(&cm_id_priv->lock);
2683
2684 if (ret)
2685 cm_process_work(cm_id_priv, work);
2686 else
2687 cm_deref_id(cm_id_priv);
2688 return 0;
2689
2690unlock: spin_unlock_irq(&cm_id_priv->lock);
2691deref: cm_deref_id(cm_id_priv);
2692 return -EINVAL;
2693}
2694
2695static int cm_drep_handler(struct cm_work *work)
2696{
2697 struct cm_id_private *cm_id_priv;
2698 struct cm_drep_msg *drep_msg;
2699 int ret;
2700
2701 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2702 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2703 drep_msg->local_comm_id);
2704 if (!cm_id_priv)
2705 return -EINVAL;
2706
2707 work->cm_event.private_data = &drep_msg->private_data;
2708
2709 spin_lock_irq(&cm_id_priv->lock);
2710 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2711 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2712 spin_unlock_irq(&cm_id_priv->lock);
2713 goto out;
2714 }
2715 cm_enter_timewait(cm_id_priv);
2716
2717 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2718 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2719 if (!ret)
2720 list_add_tail(&work->list, &cm_id_priv->work_list);
2721 spin_unlock_irq(&cm_id_priv->lock);
2722
2723 if (ret)
2724 cm_process_work(cm_id_priv, work);
2725 else
2726 cm_deref_id(cm_id_priv);
2727 return 0;
2728out:
2729 cm_deref_id(cm_id_priv);
2730 return -EINVAL;
2731}
2732
2733int ib_send_cm_rej(struct ib_cm_id *cm_id,
2734 enum ib_cm_rej_reason reason,
2735 void *ari,
2736 u8 ari_length,
2737 const void *private_data,
2738 u8 private_data_len)
2739{
2740 struct cm_id_private *cm_id_priv;
2741 struct ib_mad_send_buf *msg;
2742 unsigned long flags;
2743 int ret;
2744
2745 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2746 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2747 return -EINVAL;
2748
2749 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2750
2751 spin_lock_irqsave(&cm_id_priv->lock, flags);
2752 switch (cm_id->state) {
2753 case IB_CM_REQ_SENT:
2754 case IB_CM_MRA_REQ_RCVD:
2755 case IB_CM_REQ_RCVD:
2756 case IB_CM_MRA_REQ_SENT:
2757 case IB_CM_REP_RCVD:
2758 case IB_CM_MRA_REP_SENT:
2759 ret = cm_alloc_msg(cm_id_priv, &msg);
2760 if (!ret)
2761 cm_format_rej((struct cm_rej_msg *) msg->mad,
2762 cm_id_priv, reason, ari, ari_length,
2763 private_data, private_data_len);
2764
2765 cm_reset_to_idle(cm_id_priv);
2766 break;
2767 case IB_CM_REP_SENT:
2768 case IB_CM_MRA_REP_RCVD:
2769 ret = cm_alloc_msg(cm_id_priv, &msg);
2770 if (!ret)
2771 cm_format_rej((struct cm_rej_msg *) msg->mad,
2772 cm_id_priv, reason, ari, ari_length,
2773 private_data, private_data_len);
2774
2775 cm_enter_timewait(cm_id_priv);
2776 break;
2777 default:
2778 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2779 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2780 ret = -EINVAL;
2781 goto out;
2782 }
2783
2784 if (ret)
2785 goto out;
2786
2787 ret = ib_post_send_mad(msg, NULL);
2788 if (ret)
2789 cm_free_msg(msg);
2790
2791out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2792 return ret;
2793}
2794EXPORT_SYMBOL(ib_send_cm_rej);
2795
2796static void cm_format_rej_event(struct cm_work *work)
2797{
2798 struct cm_rej_msg *rej_msg;
2799 struct ib_cm_rej_event_param *param;
2800
2801 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2802 param = &work->cm_event.param.rej_rcvd;
2803 param->ari = rej_msg->ari;
2804 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2805 param->reason = __be16_to_cpu(rej_msg->reason);
2806 work->cm_event.private_data = &rej_msg->private_data;
2807}
2808
2809static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2810{
2811 struct cm_timewait_info *timewait_info;
2812 struct cm_id_private *cm_id_priv;
2813 __be32 remote_id;
2814
2815 remote_id = rej_msg->local_comm_id;
2816
2817 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2818 spin_lock_irq(&cm.lock);
2819 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2820 remote_id);
2821 if (!timewait_info) {
2822 spin_unlock_irq(&cm.lock);
2823 return NULL;
2824 }
2825 cm_id_priv = xa_load(&cm.local_id_table,
2826 cm_local_id(timewait_info->work.local_id));
2827 if (cm_id_priv) {
2828 if (cm_id_priv->id.remote_id == remote_id)
2829 atomic_inc(&cm_id_priv->refcount);
2830 else
2831 cm_id_priv = NULL;
2832 }
2833 spin_unlock_irq(&cm.lock);
2834 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2835 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2836 else
2837 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2838
2839 return cm_id_priv;
2840}
2841
2842static int cm_rej_handler(struct cm_work *work)
2843{
2844 struct cm_id_private *cm_id_priv;
2845 struct cm_rej_msg *rej_msg;
2846 int ret;
2847
2848 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2849 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2850 if (!cm_id_priv)
2851 return -EINVAL;
2852
2853 cm_format_rej_event(work);
2854
2855 spin_lock_irq(&cm_id_priv->lock);
2856 switch (cm_id_priv->id.state) {
2857 case IB_CM_REQ_SENT:
2858 case IB_CM_MRA_REQ_RCVD:
2859 case IB_CM_REP_SENT:
2860 case IB_CM_MRA_REP_RCVD:
2861 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2862 /* fall through */
2863 case IB_CM_REQ_RCVD:
2864 case IB_CM_MRA_REQ_SENT:
2865 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2866 cm_enter_timewait(cm_id_priv);
2867 else
2868 cm_reset_to_idle(cm_id_priv);
2869 break;
2870 case IB_CM_DREQ_SENT:
2871 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2872 /* fall through */
2873 case IB_CM_REP_RCVD:
2874 case IB_CM_MRA_REP_SENT:
2875 cm_enter_timewait(cm_id_priv);
2876 break;
2877 case IB_CM_ESTABLISHED:
2878 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2879 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2880 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2881 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2882 cm_id_priv->msg);
2883 cm_enter_timewait(cm_id_priv);
2884 break;
2885 }
2886 /* fall through */
2887 default:
2888 spin_unlock_irq(&cm_id_priv->lock);
2889 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2890 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2891 cm_id_priv->id.state);
2892 ret = -EINVAL;
2893 goto out;
2894 }
2895
2896 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2897 if (!ret)
2898 list_add_tail(&work->list, &cm_id_priv->work_list);
2899 spin_unlock_irq(&cm_id_priv->lock);
2900
2901 if (ret)
2902 cm_process_work(cm_id_priv, work);
2903 else
2904 cm_deref_id(cm_id_priv);
2905 return 0;
2906out:
2907 cm_deref_id(cm_id_priv);
2908 return -EINVAL;
2909}
2910
2911int ib_send_cm_mra(struct ib_cm_id *cm_id,
2912 u8 service_timeout,
2913 const void *private_data,
2914 u8 private_data_len)
2915{
2916 struct cm_id_private *cm_id_priv;
2917 struct ib_mad_send_buf *msg;
2918 enum ib_cm_state cm_state;
2919 enum ib_cm_lap_state lap_state;
2920 enum cm_msg_response msg_response;
2921 void *data;
2922 unsigned long flags;
2923 int ret;
2924
2925 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2926 return -EINVAL;
2927
2928 data = cm_copy_private_data(private_data, private_data_len);
2929 if (IS_ERR(data))
2930 return PTR_ERR(data);
2931
2932 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2933
2934 spin_lock_irqsave(&cm_id_priv->lock, flags);
2935 switch(cm_id_priv->id.state) {
2936 case IB_CM_REQ_RCVD:
2937 cm_state = IB_CM_MRA_REQ_SENT;
2938 lap_state = cm_id->lap_state;
2939 msg_response = CM_MSG_RESPONSE_REQ;
2940 break;
2941 case IB_CM_REP_RCVD:
2942 cm_state = IB_CM_MRA_REP_SENT;
2943 lap_state = cm_id->lap_state;
2944 msg_response = CM_MSG_RESPONSE_REP;
2945 break;
2946 case IB_CM_ESTABLISHED:
2947 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2948 cm_state = cm_id->state;
2949 lap_state = IB_CM_MRA_LAP_SENT;
2950 msg_response = CM_MSG_RESPONSE_OTHER;
2951 break;
2952 }
2953 /* fall through */
2954 default:
2955 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2956 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2957 cm_id_priv->id.state);
2958 ret = -EINVAL;
2959 goto error1;
2960 }
2961
2962 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2963 ret = cm_alloc_msg(cm_id_priv, &msg);
2964 if (ret)
2965 goto error1;
2966
2967 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2968 msg_response, service_timeout,
2969 private_data, private_data_len);
2970 ret = ib_post_send_mad(msg, NULL);
2971 if (ret)
2972 goto error2;
2973 }
2974
2975 cm_id->state = cm_state;
2976 cm_id->lap_state = lap_state;
2977 cm_id_priv->service_timeout = service_timeout;
2978 cm_set_private_data(cm_id_priv, data, private_data_len);
2979 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2980 return 0;
2981
2982error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2983 kfree(data);
2984 return ret;
2985
2986error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2987 kfree(data);
2988 cm_free_msg(msg);
2989 return ret;
2990}
2991EXPORT_SYMBOL(ib_send_cm_mra);
2992
2993static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2994{
2995 switch (cm_mra_get_msg_mraed(mra_msg)) {
2996 case CM_MSG_RESPONSE_REQ:
2997 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2998 case CM_MSG_RESPONSE_REP:
2999 case CM_MSG_RESPONSE_OTHER:
3000 return cm_acquire_id(mra_msg->remote_comm_id,
3001 mra_msg->local_comm_id);
3002 default:
3003 return NULL;
3004 }
3005}
3006
3007static int cm_mra_handler(struct cm_work *work)
3008{
3009 struct cm_id_private *cm_id_priv;
3010 struct cm_mra_msg *mra_msg;
3011 int timeout, ret;
3012
3013 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3014 cm_id_priv = cm_acquire_mraed_id(mra_msg);
3015 if (!cm_id_priv)
3016 return -EINVAL;
3017
3018 work->cm_event.private_data = &mra_msg->private_data;
3019 work->cm_event.param.mra_rcvd.service_timeout =
3020 cm_mra_get_service_timeout(mra_msg);
3021 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
3022 cm_convert_to_ms(cm_id_priv->av.timeout);
3023
3024 spin_lock_irq(&cm_id_priv->lock);
3025 switch (cm_id_priv->id.state) {
3026 case IB_CM_REQ_SENT:
3027 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
3028 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3029 cm_id_priv->msg, timeout))
3030 goto out;
3031 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3032 break;
3033 case IB_CM_REP_SENT:
3034 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
3035 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3036 cm_id_priv->msg, timeout))
3037 goto out;
3038 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3039 break;
3040 case IB_CM_ESTABLISHED:
3041 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
3042 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3043 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3044 cm_id_priv->msg, timeout)) {
3045 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3046 atomic_long_inc(&work->port->
3047 counter_group[CM_RECV_DUPLICATES].
3048 counter[CM_MRA_COUNTER]);
3049 goto out;
3050 }
3051 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3052 break;
3053 case IB_CM_MRA_REQ_RCVD:
3054 case IB_CM_MRA_REP_RCVD:
3055 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3056 counter[CM_MRA_COUNTER]);
3057 /* fall through */
3058 default:
3059 pr_debug("%s local_id %d, cm_id_priv->id.state: %d\n",
3060 __func__, be32_to_cpu(cm_id_priv->id.local_id),
3061 cm_id_priv->id.state);
3062 goto out;
3063 }
3064
3065 cm_id_priv->msg->context[1] = (void *) (unsigned long)
3066 cm_id_priv->id.state;
3067 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3068 if (!ret)
3069 list_add_tail(&work->list, &cm_id_priv->work_list);
3070 spin_unlock_irq(&cm_id_priv->lock);
3071
3072 if (ret)
3073 cm_process_work(cm_id_priv, work);
3074 else
3075 cm_deref_id(cm_id_priv);
3076 return 0;
3077out:
3078 spin_unlock_irq(&cm_id_priv->lock);
3079 cm_deref_id(cm_id_priv);
3080 return -EINVAL;
3081}
3082
3083static void cm_format_lap(struct cm_lap_msg *lap_msg,
3084 struct cm_id_private *cm_id_priv,
3085 struct sa_path_rec *alternate_path,
3086 const void *private_data,
3087 u8 private_data_len)
3088{
3089 bool alt_ext = false;
3090
3091 if (alternate_path->rec_type == SA_PATH_REC_TYPE_OPA)
3092 alt_ext = opa_is_extended_lid(alternate_path->opa.dlid,
3093 alternate_path->opa.slid);
3094 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
3095 cm_form_tid(cm_id_priv));
3096 lap_msg->local_comm_id = cm_id_priv->id.local_id;
3097 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
3098 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
3099 /* todo: need remote CM response timeout */
3100 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
3101 lap_msg->alt_local_lid =
3102 htons(ntohl(sa_path_get_slid(alternate_path)));
3103 lap_msg->alt_remote_lid =
3104 htons(ntohl(sa_path_get_dlid(alternate_path)));
3105 lap_msg->alt_local_gid = alternate_path->sgid;
3106 lap_msg->alt_remote_gid = alternate_path->dgid;
3107 if (alt_ext) {
3108 lap_msg->alt_local_gid.global.interface_id
3109 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.slid));
3110 lap_msg->alt_remote_gid.global.interface_id
3111 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.dlid));
3112 }
3113 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
3114 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
3115 lap_msg->alt_hop_limit = alternate_path->hop_limit;
3116 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
3117 cm_lap_set_sl(lap_msg, alternate_path->sl);
3118 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
3119 cm_lap_set_local_ack_timeout(lap_msg,
3120 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
3121 alternate_path->packet_life_time));
3122
3123 if (private_data && private_data_len)
3124 memcpy(lap_msg->private_data, private_data, private_data_len);
3125}
3126
3127int ib_send_cm_lap(struct ib_cm_id *cm_id,
3128 struct sa_path_rec *alternate_path,
3129 const void *private_data,
3130 u8 private_data_len)
3131{
3132 struct cm_id_private *cm_id_priv;
3133 struct ib_mad_send_buf *msg;
3134 unsigned long flags;
3135 int ret;
3136
3137 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
3138 return -EINVAL;
3139
3140 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3141 spin_lock_irqsave(&cm_id_priv->lock, flags);
3142 if (cm_id->state != IB_CM_ESTABLISHED ||
3143 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
3144 cm_id->lap_state != IB_CM_LAP_IDLE)) {
3145 ret = -EINVAL;
3146 goto out;
3147 }
3148
3149 ret = cm_init_av_by_path(alternate_path, NULL, &cm_id_priv->alt_av,
3150 cm_id_priv);
3151 if (ret)
3152 goto out;
3153 cm_id_priv->alt_av.timeout =
3154 cm_ack_timeout(cm_id_priv->target_ack_delay,
3155 cm_id_priv->alt_av.timeout - 1);
3156
3157 ret = cm_alloc_msg(cm_id_priv, &msg);
3158 if (ret)
3159 goto out;
3160
3161 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
3162 alternate_path, private_data, private_data_len);
3163 msg->timeout_ms = cm_id_priv->timeout_ms;
3164 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
3165
3166 ret = ib_post_send_mad(msg, NULL);
3167 if (ret) {
3168 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3169 cm_free_msg(msg);
3170 return ret;
3171 }
3172
3173 cm_id->lap_state = IB_CM_LAP_SENT;
3174 cm_id_priv->msg = msg;
3175
3176out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3177 return ret;
3178}
3179EXPORT_SYMBOL(ib_send_cm_lap);
3180
3181static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3182 struct sa_path_rec *path)
3183{
3184 u32 lid;
3185
3186 if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3187 sa_path_set_dlid(path, ntohs(lap_msg->alt_local_lid));
3188 sa_path_set_slid(path, ntohs(lap_msg->alt_remote_lid));
3189 } else {
3190 lid = opa_get_lid_from_gid(&lap_msg->alt_local_gid);
3191 sa_path_set_dlid(path, lid);
3192
3193 lid = opa_get_lid_from_gid(&lap_msg->alt_remote_gid);
3194 sa_path_set_slid(path, lid);
3195 }
3196}
3197
3198static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3199 struct sa_path_rec *path,
3200 struct cm_lap_msg *lap_msg)
3201{
3202 path->dgid = lap_msg->alt_local_gid;
3203 path->sgid = lap_msg->alt_remote_gid;
3204 path->flow_label = cm_lap_get_flow_label(lap_msg);
3205 path->hop_limit = lap_msg->alt_hop_limit;
3206 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
3207 path->reversible = 1;
3208 path->pkey = cm_id_priv->pkey;
3209 path->sl = cm_lap_get_sl(lap_msg);
3210 path->mtu_selector = IB_SA_EQ;
3211 path->mtu = cm_id_priv->path_mtu;
3212 path->rate_selector = IB_SA_EQ;
3213 path->rate = cm_lap_get_packet_rate(lap_msg);
3214 path->packet_life_time_selector = IB_SA_EQ;
3215 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
3216 path->packet_life_time -= (path->packet_life_time > 0);
3217 cm_format_path_lid_from_lap(lap_msg, path);
3218}
3219
3220static int cm_lap_handler(struct cm_work *work)
3221{
3222 struct cm_id_private *cm_id_priv;
3223 struct cm_lap_msg *lap_msg;
3224 struct ib_cm_lap_event_param *param;
3225 struct ib_mad_send_buf *msg = NULL;
3226 int ret;
3227
3228 /* Currently Alternate path messages are not supported for
3229 * RoCE link layer.
3230 */
3231 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3232 work->port->port_num))
3233 return -EINVAL;
3234
3235 /* todo: verify LAP request and send reject APR if invalid. */
3236 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3237 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
3238 lap_msg->local_comm_id);
3239 if (!cm_id_priv)
3240 return -EINVAL;
3241
3242 param = &work->cm_event.param.lap_rcvd;
3243 memset(&work->path[0], 0, sizeof(work->path[1]));
3244 cm_path_set_rec_type(work->port->cm_dev->ib_device,
3245 work->port->port_num,
3246 &work->path[0],
3247 &lap_msg->alt_local_gid);
3248 param->alternate_path = &work->path[0];
3249 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3250 work->cm_event.private_data = &lap_msg->private_data;
3251
3252 spin_lock_irq(&cm_id_priv->lock);
3253 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3254 goto unlock;
3255
3256 switch (cm_id_priv->id.lap_state) {
3257 case IB_CM_LAP_UNINIT:
3258 case IB_CM_LAP_IDLE:
3259 break;
3260 case IB_CM_MRA_LAP_SENT:
3261 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3262 counter[CM_LAP_COUNTER]);
3263 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3264 if (IS_ERR(msg))
3265 goto unlock;
3266
3267 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3268 CM_MSG_RESPONSE_OTHER,
3269 cm_id_priv->service_timeout,
3270 cm_id_priv->private_data,
3271 cm_id_priv->private_data_len);
3272 spin_unlock_irq(&cm_id_priv->lock);
3273
3274 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3275 ib_post_send_mad(msg, NULL))
3276 cm_free_msg(msg);
3277 goto deref;
3278 case IB_CM_LAP_RCVD:
3279 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3280 counter[CM_LAP_COUNTER]);
3281 goto unlock;
3282 default:
3283 goto unlock;
3284 }
3285
3286 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3287 work->mad_recv_wc->recv_buf.grh,
3288 &cm_id_priv->av);
3289 if (ret)
3290 goto unlock;
3291
3292 ret = cm_init_av_by_path(param->alternate_path, NULL,
3293 &cm_id_priv->alt_av, cm_id_priv);
3294 if (ret)
3295 goto unlock;
3296
3297 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3298 cm_id_priv->tid = lap_msg->hdr.tid;
3299 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3300 if (!ret)
3301 list_add_tail(&work->list, &cm_id_priv->work_list);
3302 spin_unlock_irq(&cm_id_priv->lock);
3303
3304 if (ret)
3305 cm_process_work(cm_id_priv, work);
3306 else
3307 cm_deref_id(cm_id_priv);
3308 return 0;
3309
3310unlock: spin_unlock_irq(&cm_id_priv->lock);
3311deref: cm_deref_id(cm_id_priv);
3312 return -EINVAL;
3313}
3314
3315static void cm_format_apr(struct cm_apr_msg *apr_msg,
3316 struct cm_id_private *cm_id_priv,
3317 enum ib_cm_apr_status status,
3318 void *info,
3319 u8 info_length,
3320 const void *private_data,
3321 u8 private_data_len)
3322{
3323 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
3324 apr_msg->local_comm_id = cm_id_priv->id.local_id;
3325 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
3326 apr_msg->ap_status = (u8) status;
3327
3328 if (info && info_length) {
3329 apr_msg->info_length = info_length;
3330 memcpy(apr_msg->info, info, info_length);
3331 }
3332
3333 if (private_data && private_data_len)
3334 memcpy(apr_msg->private_data, private_data, private_data_len);
3335}
3336
3337int ib_send_cm_apr(struct ib_cm_id *cm_id,
3338 enum ib_cm_apr_status status,
3339 void *info,
3340 u8 info_length,
3341 const void *private_data,
3342 u8 private_data_len)
3343{
3344 struct cm_id_private *cm_id_priv;
3345 struct ib_mad_send_buf *msg;
3346 unsigned long flags;
3347 int ret;
3348
3349 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
3350 (info && info_length > IB_CM_APR_INFO_LENGTH))
3351 return -EINVAL;
3352
3353 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3354 spin_lock_irqsave(&cm_id_priv->lock, flags);
3355 if (cm_id->state != IB_CM_ESTABLISHED ||
3356 (cm_id->lap_state != IB_CM_LAP_RCVD &&
3357 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
3358 ret = -EINVAL;
3359 goto out;
3360 }
3361
3362 ret = cm_alloc_msg(cm_id_priv, &msg);
3363 if (ret)
3364 goto out;
3365
3366 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
3367 info, info_length, private_data, private_data_len);
3368 ret = ib_post_send_mad(msg, NULL);
3369 if (ret) {
3370 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3371 cm_free_msg(msg);
3372 return ret;
3373 }
3374
3375 cm_id->lap_state = IB_CM_LAP_IDLE;
3376out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3377 return ret;
3378}
3379EXPORT_SYMBOL(ib_send_cm_apr);
3380
3381static int cm_apr_handler(struct cm_work *work)
3382{
3383 struct cm_id_private *cm_id_priv;
3384 struct cm_apr_msg *apr_msg;
3385 int ret;
3386
3387 /* Currently Alternate path messages are not supported for
3388 * RoCE link layer.
3389 */
3390 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3391 work->port->port_num))
3392 return -EINVAL;
3393
3394 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3395 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
3396 apr_msg->local_comm_id);
3397 if (!cm_id_priv)
3398 return -EINVAL; /* Unmatched reply. */
3399
3400 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
3401 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
3402 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
3403 work->cm_event.private_data = &apr_msg->private_data;
3404
3405 spin_lock_irq(&cm_id_priv->lock);
3406 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3407 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3408 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3409 spin_unlock_irq(&cm_id_priv->lock);
3410 goto out;
3411 }
3412 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3413 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3414 cm_id_priv->msg = NULL;
3415
3416 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3417 if (!ret)
3418 list_add_tail(&work->list, &cm_id_priv->work_list);
3419 spin_unlock_irq(&cm_id_priv->lock);
3420
3421 if (ret)
3422 cm_process_work(cm_id_priv, work);
3423 else
3424 cm_deref_id(cm_id_priv);
3425 return 0;
3426out:
3427 cm_deref_id(cm_id_priv);
3428 return -EINVAL;
3429}
3430
3431static int cm_timewait_handler(struct cm_work *work)
3432{
3433 struct cm_timewait_info *timewait_info;
3434 struct cm_id_private *cm_id_priv;
3435 int ret;
3436
3437 timewait_info = (struct cm_timewait_info *)work;
3438 spin_lock_irq(&cm.lock);
3439 list_del(&timewait_info->list);
3440 spin_unlock_irq(&cm.lock);
3441
3442 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3443 timewait_info->work.remote_id);
3444 if (!cm_id_priv)
3445 return -EINVAL;
3446
3447 spin_lock_irq(&cm_id_priv->lock);
3448 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3449 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3450 spin_unlock_irq(&cm_id_priv->lock);
3451 goto out;
3452 }
3453 cm_id_priv->id.state = IB_CM_IDLE;
3454 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3455 if (!ret)
3456 list_add_tail(&work->list, &cm_id_priv->work_list);
3457 spin_unlock_irq(&cm_id_priv->lock);
3458
3459 if (ret)
3460 cm_process_work(cm_id_priv, work);
3461 else
3462 cm_deref_id(cm_id_priv);
3463 return 0;
3464out:
3465 cm_deref_id(cm_id_priv);
3466 return -EINVAL;
3467}
3468
3469static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3470 struct cm_id_private *cm_id_priv,
3471 struct ib_cm_sidr_req_param *param)
3472{
3473 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3474 cm_form_tid(cm_id_priv));
3475 sidr_req_msg->request_id = cm_id_priv->id.local_id;
3476 sidr_req_msg->pkey = param->path->pkey;
3477 sidr_req_msg->service_id = param->service_id;
3478
3479 if (param->private_data && param->private_data_len)
3480 memcpy(sidr_req_msg->private_data, param->private_data,
3481 param->private_data_len);
3482}
3483
3484int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3485 struct ib_cm_sidr_req_param *param)
3486{
3487 struct cm_id_private *cm_id_priv;
3488 struct ib_mad_send_buf *msg;
3489 unsigned long flags;
3490 int ret;
3491
3492 if (!param->path || (param->private_data &&
3493 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3494 return -EINVAL;
3495
3496 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3497 ret = cm_init_av_by_path(param->path, param->sgid_attr,
3498 &cm_id_priv->av,
3499 cm_id_priv);
3500 if (ret)
3501 goto out;
3502
3503 cm_id->service_id = param->service_id;
3504 cm_id->service_mask = ~cpu_to_be64(0);
3505 cm_id_priv->timeout_ms = param->timeout_ms;
3506 cm_id_priv->max_cm_retries = param->max_cm_retries;
3507 ret = cm_alloc_msg(cm_id_priv, &msg);
3508 if (ret)
3509 goto out;
3510
3511 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3512 param);
3513 msg->timeout_ms = cm_id_priv->timeout_ms;
3514 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3515
3516 spin_lock_irqsave(&cm_id_priv->lock, flags);
3517 if (cm_id->state == IB_CM_IDLE)
3518 ret = ib_post_send_mad(msg, NULL);
3519 else
3520 ret = -EINVAL;
3521
3522 if (ret) {
3523 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3524 cm_free_msg(msg);
3525 goto out;
3526 }
3527 cm_id->state = IB_CM_SIDR_REQ_SENT;
3528 cm_id_priv->msg = msg;
3529 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3530out:
3531 return ret;
3532}
3533EXPORT_SYMBOL(ib_send_cm_sidr_req);
3534
3535static void cm_format_sidr_req_event(struct cm_work *work,
3536 const struct cm_id_private *rx_cm_id,
3537 struct ib_cm_id *listen_id)
3538{
3539 struct cm_sidr_req_msg *sidr_req_msg;
3540 struct ib_cm_sidr_req_event_param *param;
3541
3542 sidr_req_msg = (struct cm_sidr_req_msg *)
3543 work->mad_recv_wc->recv_buf.mad;
3544 param = &work->cm_event.param.sidr_req_rcvd;
3545 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
3546 param->listen_id = listen_id;
3547 param->service_id = sidr_req_msg->service_id;
3548 param->bth_pkey = cm_get_bth_pkey(work);
3549 param->port = work->port->port_num;
3550 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3551 work->cm_event.private_data = &sidr_req_msg->private_data;
3552}
3553
3554static int cm_sidr_req_handler(struct cm_work *work)
3555{
3556 struct ib_cm_id *cm_id;
3557 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
3558 struct cm_sidr_req_msg *sidr_req_msg;
3559 struct ib_wc *wc;
3560 int ret;
3561
3562 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
3563 if (IS_ERR(cm_id))
3564 return PTR_ERR(cm_id);
3565 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3566
3567 /* Record SGID/SLID and request ID for lookup. */
3568 sidr_req_msg = (struct cm_sidr_req_msg *)
3569 work->mad_recv_wc->recv_buf.mad;
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 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3580 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3581 atomic_inc(&cm_id_priv->work_count);
3582
3583 spin_lock_irq(&cm.lock);
3584 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3585 if (cur_cm_id_priv) {
3586 spin_unlock_irq(&cm.lock);
3587 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3588 counter[CM_SIDR_REQ_COUNTER]);
3589 goto out; /* Duplicate message. */
3590 }
3591 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3592 cur_cm_id_priv = cm_find_listen(cm_id->device,
3593 sidr_req_msg->service_id);
3594 if (!cur_cm_id_priv) {
3595 spin_unlock_irq(&cm.lock);
3596 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3597 goto out; /* No match. */
3598 }
3599 atomic_inc(&cur_cm_id_priv->refcount);
3600 atomic_inc(&cm_id_priv->refcount);
3601 spin_unlock_irq(&cm.lock);
3602
3603 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3604 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3605 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3606 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3607
3608 cm_format_sidr_req_event(work, cm_id_priv, &cur_cm_id_priv->id);
3609 cm_process_work(cm_id_priv, work);
3610 cm_deref_id(cur_cm_id_priv);
3611 return 0;
3612out:
3613 ib_destroy_cm_id(&cm_id_priv->id);
3614 return -EINVAL;
3615}
3616
3617static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3618 struct cm_id_private *cm_id_priv,
3619 struct ib_cm_sidr_rep_param *param)
3620{
3621 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3622 cm_id_priv->tid);
3623 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3624 sidr_rep_msg->status = param->status;
3625 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3626 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3627 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3628
3629 if (param->info && param->info_length)
3630 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3631
3632 if (param->private_data && param->private_data_len)
3633 memcpy(sidr_rep_msg->private_data, param->private_data,
3634 param->private_data_len);
3635}
3636
3637int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3638 struct ib_cm_sidr_rep_param *param)
3639{
3640 struct cm_id_private *cm_id_priv;
3641 struct ib_mad_send_buf *msg;
3642 unsigned long flags;
3643 int ret;
3644
3645 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3646 (param->private_data &&
3647 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3648 return -EINVAL;
3649
3650 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3651 spin_lock_irqsave(&cm_id_priv->lock, flags);
3652 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3653 ret = -EINVAL;
3654 goto error;
3655 }
3656
3657 ret = cm_alloc_msg(cm_id_priv, &msg);
3658 if (ret)
3659 goto error;
3660
3661 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3662 param);
3663 ret = ib_post_send_mad(msg, NULL);
3664 if (ret) {
3665 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3666 cm_free_msg(msg);
3667 return ret;
3668 }
3669 cm_id->state = IB_CM_IDLE;
3670 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3671
3672 spin_lock_irqsave(&cm.lock, flags);
3673 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3674 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3675 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3676 }
3677 spin_unlock_irqrestore(&cm.lock, flags);
3678 return 0;
3679
3680error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3681 return ret;
3682}
3683EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3684
3685static void cm_format_sidr_rep_event(struct cm_work *work,
3686 const struct cm_id_private *cm_id_priv)
3687{
3688 struct cm_sidr_rep_msg *sidr_rep_msg;
3689 struct ib_cm_sidr_rep_event_param *param;
3690
3691 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3692 work->mad_recv_wc->recv_buf.mad;
3693 param = &work->cm_event.param.sidr_rep_rcvd;
3694 param->status = sidr_rep_msg->status;
3695 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3696 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3697 param->info = &sidr_rep_msg->info;
3698 param->info_len = sidr_rep_msg->info_length;
3699 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3700 work->cm_event.private_data = &sidr_rep_msg->private_data;
3701}
3702
3703static int cm_sidr_rep_handler(struct cm_work *work)
3704{
3705 struct cm_sidr_rep_msg *sidr_rep_msg;
3706 struct cm_id_private *cm_id_priv;
3707
3708 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3709 work->mad_recv_wc->recv_buf.mad;
3710 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3711 if (!cm_id_priv)
3712 return -EINVAL; /* Unmatched reply. */
3713
3714 spin_lock_irq(&cm_id_priv->lock);
3715 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3716 spin_unlock_irq(&cm_id_priv->lock);
3717 goto out;
3718 }
3719 cm_id_priv->id.state = IB_CM_IDLE;
3720 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3721 spin_unlock_irq(&cm_id_priv->lock);
3722
3723 cm_format_sidr_rep_event(work, cm_id_priv);
3724 cm_process_work(cm_id_priv, work);
3725 return 0;
3726out:
3727 cm_deref_id(cm_id_priv);
3728 return -EINVAL;
3729}
3730
3731static void cm_process_send_error(struct ib_mad_send_buf *msg,
3732 enum ib_wc_status wc_status)
3733{
3734 struct cm_id_private *cm_id_priv;
3735 struct ib_cm_event cm_event;
3736 enum ib_cm_state state;
3737 int ret;
3738
3739 memset(&cm_event, 0, sizeof cm_event);
3740 cm_id_priv = msg->context[0];
3741
3742 /* Discard old sends or ones without a response. */
3743 spin_lock_irq(&cm_id_priv->lock);
3744 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3745 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3746 goto discard;
3747
3748 pr_debug_ratelimited("CM: failed sending MAD in state %d. (%s)\n",
3749 state, ib_wc_status_msg(wc_status));
3750 switch (state) {
3751 case IB_CM_REQ_SENT:
3752 case IB_CM_MRA_REQ_RCVD:
3753 cm_reset_to_idle(cm_id_priv);
3754 cm_event.event = IB_CM_REQ_ERROR;
3755 break;
3756 case IB_CM_REP_SENT:
3757 case IB_CM_MRA_REP_RCVD:
3758 cm_reset_to_idle(cm_id_priv);
3759 cm_event.event = IB_CM_REP_ERROR;
3760 break;
3761 case IB_CM_DREQ_SENT:
3762 cm_enter_timewait(cm_id_priv);
3763 cm_event.event = IB_CM_DREQ_ERROR;
3764 break;
3765 case IB_CM_SIDR_REQ_SENT:
3766 cm_id_priv->id.state = IB_CM_IDLE;
3767 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3768 break;
3769 default:
3770 goto discard;
3771 }
3772 spin_unlock_irq(&cm_id_priv->lock);
3773 cm_event.param.send_status = wc_status;
3774
3775 /* No other events can occur on the cm_id at this point. */
3776 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3777 cm_free_msg(msg);
3778 if (ret)
3779 ib_destroy_cm_id(&cm_id_priv->id);
3780 return;
3781discard:
3782 spin_unlock_irq(&cm_id_priv->lock);
3783 cm_free_msg(msg);
3784}
3785
3786static void cm_send_handler(struct ib_mad_agent *mad_agent,
3787 struct ib_mad_send_wc *mad_send_wc)
3788{
3789 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3790 struct cm_port *port;
3791 u16 attr_index;
3792
3793 port = mad_agent->context;
3794 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3795 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3796
3797 /*
3798 * If the send was in response to a received message (context[0] is not
3799 * set to a cm_id), and is not a REJ, then it is a send that was
3800 * manually retried.
3801 */
3802 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3803 msg->retries = 1;
3804
3805 atomic_long_add(1 + msg->retries,
3806 &port->counter_group[CM_XMIT].counter[attr_index]);
3807 if (msg->retries)
3808 atomic_long_add(msg->retries,
3809 &port->counter_group[CM_XMIT_RETRIES].
3810 counter[attr_index]);
3811
3812 switch (mad_send_wc->status) {
3813 case IB_WC_SUCCESS:
3814 case IB_WC_WR_FLUSH_ERR:
3815 cm_free_msg(msg);
3816 break;
3817 default:
3818 if (msg->context[0] && msg->context[1])
3819 cm_process_send_error(msg, mad_send_wc->status);
3820 else
3821 cm_free_msg(msg);
3822 break;
3823 }
3824}
3825
3826static void cm_work_handler(struct work_struct *_work)
3827{
3828 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3829 int ret;
3830
3831 switch (work->cm_event.event) {
3832 case IB_CM_REQ_RECEIVED:
3833 ret = cm_req_handler(work);
3834 break;
3835 case IB_CM_MRA_RECEIVED:
3836 ret = cm_mra_handler(work);
3837 break;
3838 case IB_CM_REJ_RECEIVED:
3839 ret = cm_rej_handler(work);
3840 break;
3841 case IB_CM_REP_RECEIVED:
3842 ret = cm_rep_handler(work);
3843 break;
3844 case IB_CM_RTU_RECEIVED:
3845 ret = cm_rtu_handler(work);
3846 break;
3847 case IB_CM_USER_ESTABLISHED:
3848 ret = cm_establish_handler(work);
3849 break;
3850 case IB_CM_DREQ_RECEIVED:
3851 ret = cm_dreq_handler(work);
3852 break;
3853 case IB_CM_DREP_RECEIVED:
3854 ret = cm_drep_handler(work);
3855 break;
3856 case IB_CM_SIDR_REQ_RECEIVED:
3857 ret = cm_sidr_req_handler(work);
3858 break;
3859 case IB_CM_SIDR_REP_RECEIVED:
3860 ret = cm_sidr_rep_handler(work);
3861 break;
3862 case IB_CM_LAP_RECEIVED:
3863 ret = cm_lap_handler(work);
3864 break;
3865 case IB_CM_APR_RECEIVED:
3866 ret = cm_apr_handler(work);
3867 break;
3868 case IB_CM_TIMEWAIT_EXIT:
3869 ret = cm_timewait_handler(work);
3870 break;
3871 default:
3872 pr_debug("cm_event.event: 0x%x\n", work->cm_event.event);
3873 ret = -EINVAL;
3874 break;
3875 }
3876 if (ret)
3877 cm_free_work(work);
3878}
3879
3880static int cm_establish(struct ib_cm_id *cm_id)
3881{
3882 struct cm_id_private *cm_id_priv;
3883 struct cm_work *work;
3884 unsigned long flags;
3885 int ret = 0;
3886 struct cm_device *cm_dev;
3887
3888 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3889 if (!cm_dev)
3890 return -ENODEV;
3891
3892 work = kmalloc(sizeof *work, GFP_ATOMIC);
3893 if (!work)
3894 return -ENOMEM;
3895
3896 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3897 spin_lock_irqsave(&cm_id_priv->lock, flags);
3898 switch (cm_id->state)
3899 {
3900 case IB_CM_REP_SENT:
3901 case IB_CM_MRA_REP_RCVD:
3902 cm_id->state = IB_CM_ESTABLISHED;
3903 break;
3904 case IB_CM_ESTABLISHED:
3905 ret = -EISCONN;
3906 break;
3907 default:
3908 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
3909 be32_to_cpu(cm_id->local_id), cm_id->state);
3910 ret = -EINVAL;
3911 break;
3912 }
3913 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3914
3915 if (ret) {
3916 kfree(work);
3917 goto out;
3918 }
3919
3920 /*
3921 * The CM worker thread may try to destroy the cm_id before it
3922 * can execute this work item. To prevent potential deadlock,
3923 * we need to find the cm_id once we're in the context of the
3924 * worker thread, rather than holding a reference on it.
3925 */
3926 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3927 work->local_id = cm_id->local_id;
3928 work->remote_id = cm_id->remote_id;
3929 work->mad_recv_wc = NULL;
3930 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3931
3932 /* Check if the device started its remove_one */
3933 spin_lock_irqsave(&cm.lock, flags);
3934 if (!cm_dev->going_down) {
3935 queue_delayed_work(cm.wq, &work->work, 0);
3936 } else {
3937 kfree(work);
3938 ret = -ENODEV;
3939 }
3940 spin_unlock_irqrestore(&cm.lock, flags);
3941
3942out:
3943 return ret;
3944}
3945
3946static int cm_migrate(struct ib_cm_id *cm_id)
3947{
3948 struct cm_id_private *cm_id_priv;
3949 struct cm_av tmp_av;
3950 unsigned long flags;
3951 int tmp_send_port_not_ready;
3952 int ret = 0;
3953
3954 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3955 spin_lock_irqsave(&cm_id_priv->lock, flags);
3956 if (cm_id->state == IB_CM_ESTABLISHED &&
3957 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3958 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3959 cm_id->lap_state = IB_CM_LAP_IDLE;
3960 /* Swap address vector */
3961 tmp_av = cm_id_priv->av;
3962 cm_id_priv->av = cm_id_priv->alt_av;
3963 cm_id_priv->alt_av = tmp_av;
3964 /* Swap port send ready state */
3965 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3966 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3967 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3968 } else
3969 ret = -EINVAL;
3970 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3971
3972 return ret;
3973}
3974
3975int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3976{
3977 int ret;
3978
3979 switch (event) {
3980 case IB_EVENT_COMM_EST:
3981 ret = cm_establish(cm_id);
3982 break;
3983 case IB_EVENT_PATH_MIG:
3984 ret = cm_migrate(cm_id);
3985 break;
3986 default:
3987 ret = -EINVAL;
3988 }
3989 return ret;
3990}
3991EXPORT_SYMBOL(ib_cm_notify);
3992
3993static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3994 struct ib_mad_send_buf *send_buf,
3995 struct ib_mad_recv_wc *mad_recv_wc)
3996{
3997 struct cm_port *port = mad_agent->context;
3998 struct cm_work *work;
3999 enum ib_cm_event_type event;
4000 bool alt_path = false;
4001 u16 attr_id;
4002 int paths = 0;
4003 int going_down = 0;
4004
4005 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4006 case CM_REQ_ATTR_ID:
4007 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4008 mad_recv_wc->recv_buf.mad);
4009 paths = 1 + (alt_path != 0);
4010 event = IB_CM_REQ_RECEIVED;
4011 break;
4012 case CM_MRA_ATTR_ID:
4013 event = IB_CM_MRA_RECEIVED;
4014 break;
4015 case CM_REJ_ATTR_ID:
4016 event = IB_CM_REJ_RECEIVED;
4017 break;
4018 case CM_REP_ATTR_ID:
4019 event = IB_CM_REP_RECEIVED;
4020 break;
4021 case CM_RTU_ATTR_ID:
4022 event = IB_CM_RTU_RECEIVED;
4023 break;
4024 case CM_DREQ_ATTR_ID:
4025 event = IB_CM_DREQ_RECEIVED;
4026 break;
4027 case CM_DREP_ATTR_ID:
4028 event = IB_CM_DREP_RECEIVED;
4029 break;
4030 case CM_SIDR_REQ_ATTR_ID:
4031 event = IB_CM_SIDR_REQ_RECEIVED;
4032 break;
4033 case CM_SIDR_REP_ATTR_ID:
4034 event = IB_CM_SIDR_REP_RECEIVED;
4035 break;
4036 case CM_LAP_ATTR_ID:
4037 paths = 1;
4038 event = IB_CM_LAP_RECEIVED;
4039 break;
4040 case CM_APR_ATTR_ID:
4041 event = IB_CM_APR_RECEIVED;
4042 break;
4043 default:
4044 ib_free_recv_mad(mad_recv_wc);
4045 return;
4046 }
4047
4048 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4049 atomic_long_inc(&port->counter_group[CM_RECV].
4050 counter[attr_id - CM_ATTR_ID_OFFSET]);
4051
4052 work = kmalloc(struct_size(work, path, paths), GFP_KERNEL);
4053 if (!work) {
4054 ib_free_recv_mad(mad_recv_wc);
4055 return;
4056 }
4057
4058 INIT_DELAYED_WORK(&work->work, cm_work_handler);
4059 work->cm_event.event = event;
4060 work->mad_recv_wc = mad_recv_wc;
4061 work->port = port;
4062
4063 /* Check if the device started its remove_one */
4064 spin_lock_irq(&cm.lock);
4065 if (!port->cm_dev->going_down)
4066 queue_delayed_work(cm.wq, &work->work, 0);
4067 else
4068 going_down = 1;
4069 spin_unlock_irq(&cm.lock);
4070
4071 if (going_down) {
4072 kfree(work);
4073 ib_free_recv_mad(mad_recv_wc);
4074 }
4075}
4076
4077static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4078 struct ib_qp_attr *qp_attr,
4079 int *qp_attr_mask)
4080{
4081 unsigned long flags;
4082 int ret;
4083
4084 spin_lock_irqsave(&cm_id_priv->lock, flags);
4085 switch (cm_id_priv->id.state) {
4086 case IB_CM_REQ_SENT:
4087 case IB_CM_MRA_REQ_RCVD:
4088 case IB_CM_REQ_RCVD:
4089 case IB_CM_MRA_REQ_SENT:
4090 case IB_CM_REP_RCVD:
4091 case IB_CM_MRA_REP_SENT:
4092 case IB_CM_REP_SENT:
4093 case IB_CM_MRA_REP_RCVD:
4094 case IB_CM_ESTABLISHED:
4095 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4096 IB_QP_PKEY_INDEX | IB_QP_PORT;
4097 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4098 if (cm_id_priv->responder_resources)
4099 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4100 IB_ACCESS_REMOTE_ATOMIC;
4101 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4102 qp_attr->port_num = cm_id_priv->av.port->port_num;
4103 ret = 0;
4104 break;
4105 default:
4106 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4107 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4108 cm_id_priv->id.state);
4109 ret = -EINVAL;
4110 break;
4111 }
4112 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4113 return ret;
4114}
4115
4116static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4117 struct ib_qp_attr *qp_attr,
4118 int *qp_attr_mask)
4119{
4120 unsigned long flags;
4121 int ret;
4122
4123 spin_lock_irqsave(&cm_id_priv->lock, flags);
4124 switch (cm_id_priv->id.state) {
4125 case IB_CM_REQ_RCVD:
4126 case IB_CM_MRA_REQ_SENT:
4127 case IB_CM_REP_RCVD:
4128 case IB_CM_MRA_REP_SENT:
4129 case IB_CM_REP_SENT:
4130 case IB_CM_MRA_REP_RCVD:
4131 case IB_CM_ESTABLISHED:
4132 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4133 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4134 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4135 qp_attr->path_mtu = cm_id_priv->path_mtu;
4136 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4137 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4138 if (cm_id_priv->qp_type == IB_QPT_RC ||
4139 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4140 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4141 IB_QP_MIN_RNR_TIMER;
4142 qp_attr->max_dest_rd_atomic =
4143 cm_id_priv->responder_resources;
4144 qp_attr->min_rnr_timer = 0;
4145 }
4146 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4147 *qp_attr_mask |= IB_QP_ALT_PATH;
4148 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4149 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4150 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4151 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4152 }
4153 ret = 0;
4154 break;
4155 default:
4156 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4157 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4158 cm_id_priv->id.state);
4159 ret = -EINVAL;
4160 break;
4161 }
4162 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4163 return ret;
4164}
4165
4166static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4167 struct ib_qp_attr *qp_attr,
4168 int *qp_attr_mask)
4169{
4170 unsigned long flags;
4171 int ret;
4172
4173 spin_lock_irqsave(&cm_id_priv->lock, flags);
4174 switch (cm_id_priv->id.state) {
4175 /* Allow transition to RTS before sending REP */
4176 case IB_CM_REQ_RCVD:
4177 case IB_CM_MRA_REQ_SENT:
4178
4179 case IB_CM_REP_RCVD:
4180 case IB_CM_MRA_REP_SENT:
4181 case IB_CM_REP_SENT:
4182 case IB_CM_MRA_REP_RCVD:
4183 case IB_CM_ESTABLISHED:
4184 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4185 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4186 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4187 switch (cm_id_priv->qp_type) {
4188 case IB_QPT_RC:
4189 case IB_QPT_XRC_INI:
4190 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4191 IB_QP_MAX_QP_RD_ATOMIC;
4192 qp_attr->retry_cnt = cm_id_priv->retry_count;
4193 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4194 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4195 /* fall through */
4196 case IB_QPT_XRC_TGT:
4197 *qp_attr_mask |= IB_QP_TIMEOUT;
4198 qp_attr->timeout = cm_id_priv->av.timeout;
4199 break;
4200 default:
4201 break;
4202 }
4203 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4204 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4205 qp_attr->path_mig_state = IB_MIG_REARM;
4206 }
4207 } else {
4208 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4209 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4210 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4211 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4212 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4213 qp_attr->path_mig_state = IB_MIG_REARM;
4214 }
4215 ret = 0;
4216 break;
4217 default:
4218 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4219 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4220 cm_id_priv->id.state);
4221 ret = -EINVAL;
4222 break;
4223 }
4224 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4225 return ret;
4226}
4227
4228int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4229 struct ib_qp_attr *qp_attr,
4230 int *qp_attr_mask)
4231{
4232 struct cm_id_private *cm_id_priv;
4233 int ret;
4234
4235 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4236 switch (qp_attr->qp_state) {
4237 case IB_QPS_INIT:
4238 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4239 break;
4240 case IB_QPS_RTR:
4241 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4242 break;
4243 case IB_QPS_RTS:
4244 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4245 break;
4246 default:
4247 ret = -EINVAL;
4248 break;
4249 }
4250 return ret;
4251}
4252EXPORT_SYMBOL(ib_cm_init_qp_attr);
4253
4254static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
4255 char *buf)
4256{
4257 struct cm_counter_group *group;
4258 struct cm_counter_attribute *cm_attr;
4259
4260 group = container_of(obj, struct cm_counter_group, obj);
4261 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
4262
4263 return sprintf(buf, "%ld\n",
4264 atomic_long_read(&group->counter[cm_attr->index]));
4265}
4266
4267static const struct sysfs_ops cm_counter_ops = {
4268 .show = cm_show_counter
4269};
4270
4271static struct kobj_type cm_counter_obj_type = {
4272 .sysfs_ops = &cm_counter_ops,
4273 .default_attrs = cm_counter_default_attrs
4274};
4275
4276static char *cm_devnode(struct device *dev, umode_t *mode)
4277{
4278 if (mode)
4279 *mode = 0666;
4280 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
4281}
4282
4283struct class cm_class = {
4284 .owner = THIS_MODULE,
4285 .name = "infiniband_cm",
4286 .devnode = cm_devnode,
4287};
4288EXPORT_SYMBOL(cm_class);
4289
4290static int cm_create_port_fs(struct cm_port *port)
4291{
4292 int i, ret;
4293
4294 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
4295 ret = ib_port_register_module_stat(port->cm_dev->ib_device,
4296 port->port_num,
4297 &port->counter_group[i].obj,
4298 &cm_counter_obj_type,
4299 counter_group_names[i]);
4300 if (ret)
4301 goto error;
4302 }
4303
4304 return 0;
4305
4306error:
4307 while (i--)
4308 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4309 return ret;
4310
4311}
4312
4313static void cm_remove_port_fs(struct cm_port *port)
4314{
4315 int i;
4316
4317 for (i = 0; i < CM_COUNTER_GROUPS; i++)
4318 ib_port_unregister_module_stat(&port->counter_group[i].obj);
4319
4320}
4321
4322static void cm_add_one(struct ib_device *ib_device)
4323{
4324 struct cm_device *cm_dev;
4325 struct cm_port *port;
4326 struct ib_mad_reg_req reg_req = {
4327 .mgmt_class = IB_MGMT_CLASS_CM,
4328 .mgmt_class_version = IB_CM_CLASS_VERSION,
4329 };
4330 struct ib_port_modify port_modify = {
4331 .set_port_cap_mask = IB_PORT_CM_SUP
4332 };
4333 unsigned long flags;
4334 int ret;
4335 int count = 0;
4336 u8 i;
4337
4338 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4339 GFP_KERNEL);
4340 if (!cm_dev)
4341 return;
4342
4343 cm_dev->ib_device = ib_device;
4344 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4345 cm_dev->going_down = 0;
4346
4347 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4348 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4349 if (!rdma_cap_ib_cm(ib_device, i))
4350 continue;
4351
4352 port = kzalloc(sizeof *port, GFP_KERNEL);
4353 if (!port)
4354 goto error1;
4355
4356 cm_dev->port[i-1] = port;
4357 port->cm_dev = cm_dev;
4358 port->port_num = i;
4359
4360 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4361 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4362
4363 ret = cm_create_port_fs(port);
4364 if (ret)
4365 goto error1;
4366
4367 port->mad_agent = ib_register_mad_agent(ib_device, i,
4368 IB_QPT_GSI,
4369 ®_req,
4370 0,
4371 cm_send_handler,
4372 cm_recv_handler,
4373 port,
4374 0);
4375 if (IS_ERR(port->mad_agent))
4376 goto error2;
4377
4378 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4379 if (ret)
4380 goto error3;
4381
4382 count++;
4383 }
4384
4385 if (!count)
4386 goto free;
4387
4388 ib_set_client_data(ib_device, &cm_client, cm_dev);
4389
4390 write_lock_irqsave(&cm.device_lock, flags);
4391 list_add_tail(&cm_dev->list, &cm.device_list);
4392 write_unlock_irqrestore(&cm.device_lock, flags);
4393 return;
4394
4395error3:
4396 ib_unregister_mad_agent(port->mad_agent);
4397error2:
4398 cm_remove_port_fs(port);
4399error1:
4400 port_modify.set_port_cap_mask = 0;
4401 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4402 kfree(port);
4403 while (--i) {
4404 if (!rdma_cap_ib_cm(ib_device, i))
4405 continue;
4406
4407 port = cm_dev->port[i-1];
4408 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4409 ib_unregister_mad_agent(port->mad_agent);
4410 cm_remove_port_fs(port);
4411 kfree(port);
4412 }
4413free:
4414 kfree(cm_dev);
4415}
4416
4417static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4418{
4419 struct cm_device *cm_dev = client_data;
4420 struct cm_port *port;
4421 struct cm_id_private *cm_id_priv;
4422 struct ib_mad_agent *cur_mad_agent;
4423 struct ib_port_modify port_modify = {
4424 .clr_port_cap_mask = IB_PORT_CM_SUP
4425 };
4426 unsigned long flags;
4427 int i;
4428
4429 if (!cm_dev)
4430 return;
4431
4432 write_lock_irqsave(&cm.device_lock, flags);
4433 list_del(&cm_dev->list);
4434 write_unlock_irqrestore(&cm.device_lock, flags);
4435
4436 spin_lock_irq(&cm.lock);
4437 cm_dev->going_down = 1;
4438 spin_unlock_irq(&cm.lock);
4439
4440 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4441 if (!rdma_cap_ib_cm(ib_device, i))
4442 continue;
4443
4444 port = cm_dev->port[i-1];
4445 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4446 /* Mark all the cm_id's as not valid */
4447 spin_lock_irq(&cm.lock);
4448 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4449 cm_id_priv->altr_send_port_not_ready = 1;
4450 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4451 cm_id_priv->prim_send_port_not_ready = 1;
4452 spin_unlock_irq(&cm.lock);
4453 /*
4454 * We flush the queue here after the going_down set, this
4455 * verify that no new works will be queued in the recv handler,
4456 * after that we can call the unregister_mad_agent
4457 */
4458 flush_workqueue(cm.wq);
4459 spin_lock_irq(&cm.state_lock);
4460 cur_mad_agent = port->mad_agent;
4461 port->mad_agent = NULL;
4462 spin_unlock_irq(&cm.state_lock);
4463 ib_unregister_mad_agent(cur_mad_agent);
4464 cm_remove_port_fs(port);
4465 kfree(port);
4466 }
4467
4468 kfree(cm_dev);
4469}
4470
4471static int __init ib_cm_init(void)
4472{
4473 int ret;
4474
4475 INIT_LIST_HEAD(&cm.device_list);
4476 rwlock_init(&cm.device_lock);
4477 spin_lock_init(&cm.lock);
4478 spin_lock_init(&cm.state_lock);
4479 cm.listen_service_table = RB_ROOT;
4480 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4481 cm.remote_id_table = RB_ROOT;
4482 cm.remote_qp_table = RB_ROOT;
4483 cm.remote_sidr_table = RB_ROOT;
4484 xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);
4485 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4486 INIT_LIST_HEAD(&cm.timewait_list);
4487
4488 ret = class_register(&cm_class);
4489 if (ret) {
4490 ret = -ENOMEM;
4491 goto error1;
4492 }
4493
4494 cm.wq = alloc_workqueue("ib_cm", 0, 1);
4495 if (!cm.wq) {
4496 ret = -ENOMEM;
4497 goto error2;
4498 }
4499
4500 ret = ib_register_client(&cm_client);
4501 if (ret)
4502 goto error3;
4503
4504 return 0;
4505error3:
4506 destroy_workqueue(cm.wq);
4507error2:
4508 class_unregister(&cm_class);
4509error1:
4510 return ret;
4511}
4512
4513static void __exit ib_cm_cleanup(void)
4514{
4515 struct cm_timewait_info *timewait_info, *tmp;
4516
4517 spin_lock_irq(&cm.lock);
4518 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4519 cancel_delayed_work(&timewait_info->work.work);
4520 spin_unlock_irq(&cm.lock);
4521
4522 ib_unregister_client(&cm_client);
4523 destroy_workqueue(cm.wq);
4524
4525 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4526 list_del(&timewait_info->list);
4527 kfree(timewait_info);
4528 }
4529
4530 class_unregister(&cm_class);
4531 WARN_ON(!xa_empty(&cm.local_id_table));
4532}
4533
4534module_init(ib_cm_init);
4535module_exit(ib_cm_cleanup);