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Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-block.git] / drivers / infiniband / core / cm.c
CommitLineData
a977049d
HR		 1/*
2 * Copyright (c) 2004, 2005 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 * $Id: cm.c 2821 2005-07-08 17:07:28Z sean.hefty $
36 */
37#include <linux/dma-mapping.h>
38#include <linux/err.h>
39#include <linux/idr.h>
40#include <linux/interrupt.h>
41#include <linux/pci.h>
42#include <linux/rbtree.h>
43#include <linux/spinlock.h>
44#include <linux/workqueue.h>
45
a4d61e84
RD		 46#include <rdma/ib_cache.h>
47#include <rdma/ib_cm.h>
a977049d
HR		 48#include "cm_msgs.h"
49
50MODULE_AUTHOR("Sean Hefty");
51MODULE_DESCRIPTION("InfiniBand CM");
52MODULE_LICENSE("Dual BSD/GPL");
53
54static void cm_add_one(struct ib_device *device);
55static void cm_remove_one(struct ib_device *device);
56
57static struct ib_client cm_client = {
58 .name = "cm",
59 .add = cm_add_one,
60 .remove = cm_remove_one
61};
62
63static struct ib_cm {
64 spinlock_t lock;
65 struct list_head device_list;
66 rwlock_t device_lock;
67 struct rb_root listen_service_table;
68 u64 listen_service_id;
69 /* struct rb_root peer_service_table; todo: fix peer to peer */
70 struct rb_root remote_qp_table;
71 struct rb_root remote_id_table;
72 struct rb_root remote_sidr_table;
73 struct idr local_id_table;
74 struct workqueue_struct *wq;
75} cm;
76
77struct cm_port {
78 struct cm_device *cm_dev;
79 struct ib_mad_agent *mad_agent;
80 u8 port_num;
81};
82
83struct cm_device {
84 struct list_head list;
85 struct ib_device *device;
97f52eb4 86 __be64 ca_guid;
a977049d
HR		 87 struct cm_port port[0];
88};
89
90struct cm_av {
91 struct cm_port *port;
92 union ib_gid dgid;
93 struct ib_ah_attr ah_attr;
94 u16 pkey_index;
95 u8 packet_life_time;
96};
97
98struct cm_work {
99 struct work_struct work;
100 struct list_head list;
101 struct cm_port *port;
102 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
97f52eb4
SH		 103 __be32 local_id; /* Established / timewait */
104 __be32 remote_id;
a977049d
HR		 105 struct ib_cm_event cm_event;
106 struct ib_sa_path_rec path[0];
107};
108
109struct cm_timewait_info {
110 struct cm_work work; /* Must be first. */
111 struct rb_node remote_qp_node;
112 struct rb_node remote_id_node;
97f52eb4
SH		 113 __be64 remote_ca_guid;
114 __be32 remote_qpn;
a977049d
HR		 115 u8 inserted_remote_qp;
116 u8 inserted_remote_id;
117};
118
119struct cm_id_private {
120 struct ib_cm_id id;
121
122 struct rb_node service_node;
123 struct rb_node sidr_id_node;
124 spinlock_t lock;
125 wait_queue_head_t wait;
126 atomic_t refcount;
127
128 struct ib_mad_send_buf *msg;
129 struct cm_timewait_info *timewait_info;
130 /* todo: use alternate port on send failure */
131 struct cm_av av;
132 struct cm_av alt_av;
133
134 void *private_data;
97f52eb4
SH		 135 __be64 tid;
136 __be32 local_qpn;
137 __be32 remote_qpn;
138 __be32 sq_psn;
139 __be32 rq_psn;
a977049d
HR		 140 int timeout_ms;
141 enum ib_mtu path_mtu;
142 u8 private_data_len;
143 u8 max_cm_retries;
144 u8 peer_to_peer;
145 u8 responder_resources;
146 u8 initiator_depth;
147 u8 local_ack_timeout;
148 u8 retry_count;
149 u8 rnr_retry_count;
150 u8 service_timeout;
151
152 struct list_head work_list;
153 atomic_t work_count;
154};
155
156static void cm_work_handler(void *data);
157
158static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
159{
160 if (atomic_dec_and_test(&cm_id_priv->refcount))
161 wake_up(&cm_id_priv->wait);
162}
163
164static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
165 struct ib_mad_send_buf **msg)
166{
167 struct ib_mad_agent *mad_agent;
168 struct ib_mad_send_buf *m;
169 struct ib_ah *ah;
170
171 mad_agent = cm_id_priv->av.port->mad_agent;
172 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
173 if (IS_ERR(ah))
174 return PTR_ERR(ah);
175
354ba39c
JK		 176 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
177 cm_id_priv->av.pkey_index,
a977049d
HR		 178 ah, 0, sizeof(struct ib_mad_hdr),
179 sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr),
180 GFP_ATOMIC);
181 if (IS_ERR(m)) {
182 ib_destroy_ah(ah);
183 return PTR_ERR(m);
184 }
185
186 /* Timeout set by caller if response is expected. */
187 m->send_wr.wr.ud.retries = cm_id_priv->max_cm_retries;
188
189 atomic_inc(&cm_id_priv->refcount);
190 m->context[0] = cm_id_priv;
191 *msg = m;
192 return 0;
193}
194
195static int cm_alloc_response_msg(struct cm_port *port,
196 struct ib_mad_recv_wc *mad_recv_wc,
197 struct ib_mad_send_buf **msg)
198{
199 struct ib_mad_send_buf *m;
200 struct ib_ah *ah;
201
202 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
203 mad_recv_wc->recv_buf.grh, port->port_num);
204 if (IS_ERR(ah))
205 return PTR_ERR(ah);
206
207 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
208 ah, 0, sizeof(struct ib_mad_hdr),
209 sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr),
210 GFP_ATOMIC);
211 if (IS_ERR(m)) {
212 ib_destroy_ah(ah);
213 return PTR_ERR(m);
214 }
215 *msg = m;
216 return 0;
217}
218
219static void cm_free_msg(struct ib_mad_send_buf *msg)
220{
221 ib_destroy_ah(msg->send_wr.wr.ud.ah);
222 if (msg->context[0])
223 cm_deref_id(msg->context[0]);
224 ib_free_send_mad(msg);
225}
226
227static void * cm_copy_private_data(const void *private_data,
228 u8 private_data_len)
229{
230 void *data;
231
232 if (!private_data || !private_data_len)
233 return NULL;
234
235 data = kmalloc(private_data_len, GFP_KERNEL);
236 if (!data)
237 return ERR_PTR(-ENOMEM);
238
239 memcpy(data, private_data, private_data_len);
240 return data;
241}
242
243static void cm_set_private_data(struct cm_id_private *cm_id_priv,
244 void *private_data, u8 private_data_len)
245{
246 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
247 kfree(cm_id_priv->private_data);
248
249 cm_id_priv->private_data = private_data;
250 cm_id_priv->private_data_len = private_data_len;
251}
252
253static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num,
254 u16 dlid, u8 sl, u16 src_path_bits)
255{
256 memset(ah_attr, 0, sizeof ah_attr);
97f52eb4 257 ah_attr->dlid = dlid;
a977049d
HR		 258 ah_attr->sl = sl;
259 ah_attr->src_path_bits = src_path_bits;
260 ah_attr->port_num = port_num;
261}
262
263static void cm_init_av_for_response(struct cm_port *port,
264 struct ib_wc *wc, struct cm_av *av)
265{
266 av->port = port;
267 av->pkey_index = wc->pkey_index;
97f52eb4 268 cm_set_ah_attr(&av->ah_attr, port->port_num, wc->slid,
a977049d
HR		 269 wc->sl, wc->dlid_path_bits);
270}
271
272static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
273{
274 struct cm_device *cm_dev;
275 struct cm_port *port = NULL;
276 unsigned long flags;
277 int ret;
278 u8 p;
279
280 read_lock_irqsave(&cm.device_lock, flags);
281 list_for_each_entry(cm_dev, &cm.device_list, list) {
282 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
283 &p, NULL)) {
284 port = &cm_dev->port[p-1];
285 break;
286 }
287 }
288 read_unlock_irqrestore(&cm.device_lock, flags);
289
290 if (!port)
291 return -EINVAL;
292
293 ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
294 be16_to_cpu(path->pkey), &av->pkey_index);
295 if (ret)
296 return ret;
297
298 av->port = port;
97f52eb4
SH		 299 cm_set_ah_attr(&av->ah_attr, av->port->port_num,
300 be16_to_cpu(path->dlid), path->sl,
301 be16_to_cpu(path->slid) & 0x7F);
a977049d
HR		 302 av->packet_life_time = path->packet_life_time;
303 return 0;
304}
305
306static int cm_alloc_id(struct cm_id_private *cm_id_priv)
307{
308 unsigned long flags;
309 int ret;
310
311 do {
312 spin_lock_irqsave(&cm.lock, flags);
313 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1,
97f52eb4 314 (__force int *) &cm_id_priv->id.local_id);
a977049d
HR		 315 spin_unlock_irqrestore(&cm.lock, flags);
316 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
317 return ret;
318}
319
97f52eb4 320static void cm_free_id(__be32 local_id)
a977049d
HR		 321{
322 unsigned long flags;
323
324 spin_lock_irqsave(&cm.lock, flags);
97f52eb4 325 idr_remove(&cm.local_id_table, (__force int) local_id);
a977049d
HR		 326 spin_unlock_irqrestore(&cm.lock, flags);
327}
328
97f52eb4 329static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
a977049d
HR		 330{
331 struct cm_id_private *cm_id_priv;
332
97f52eb4 333 cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id);
a977049d
HR		 334 if (cm_id_priv) {
335 if (cm_id_priv->id.remote_id == remote_id)
336 atomic_inc(&cm_id_priv->refcount);
337 else
338 cm_id_priv = NULL;
339 }
340
341 return cm_id_priv;
342}
343
97f52eb4 344static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
a977049d
HR		 345{
346 struct cm_id_private *cm_id_priv;
347 unsigned long flags;
348
349 spin_lock_irqsave(&cm.lock, flags);
350 cm_id_priv = cm_get_id(local_id, remote_id);
351 spin_unlock_irqrestore(&cm.lock, flags);
352
353 return cm_id_priv;
354}
355
356static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
357{
358 struct rb_node **link = &cm.listen_service_table.rb_node;
359 struct rb_node *parent = NULL;
360 struct cm_id_private *cur_cm_id_priv;
97f52eb4
SH		 361 __be64 service_id = cm_id_priv->id.service_id;
362 __be64 service_mask = cm_id_priv->id.service_mask;
a977049d
HR		 363
364 while (*link) {
365 parent = *link;
366 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
367 service_node);
368 if ((cur_cm_id_priv->id.service_mask & service_id) ==
369 (service_mask & cur_cm_id_priv->id.service_id))
370 return cm_id_priv;
371 if (service_id < cur_cm_id_priv->id.service_id)
372 link = &(*link)->rb_left;
373 else
374 link = &(*link)->rb_right;
375 }
376 rb_link_node(&cm_id_priv->service_node, parent, link);
377 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
378 return NULL;
379}
380
97f52eb4 381static struct cm_id_private * cm_find_listen(__be64 service_id)
a977049d
HR		 382{
383 struct rb_node *node = cm.listen_service_table.rb_node;
384 struct cm_id_private *cm_id_priv;
385
386 while (node) {
387 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
388 if ((cm_id_priv->id.service_mask & service_id) ==
389 (cm_id_priv->id.service_mask & cm_id_priv->id.service_id))
390 return cm_id_priv;
391 if (service_id < cm_id_priv->id.service_id)
392 node = node->rb_left;
393 else
394 node = node->rb_right;
395 }
396 return NULL;
397}
398
399static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
400 *timewait_info)
401{
402 struct rb_node **link = &cm.remote_id_table.rb_node;
403 struct rb_node *parent = NULL;
404 struct cm_timewait_info *cur_timewait_info;
97f52eb4
SH		 405 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
406 __be32 remote_id = timewait_info->work.remote_id;
a977049d
HR		 407
408 while (*link) {
409 parent = *link;
410 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
411 remote_id_node);
412 if (remote_id < cur_timewait_info->work.remote_id)
413 link = &(*link)->rb_left;
414 else if (remote_id > cur_timewait_info->work.remote_id)
415 link = &(*link)->rb_right;
416 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
417 link = &(*link)->rb_left;
418 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
419 link = &(*link)->rb_right;
420 else
421 return cur_timewait_info;
422 }
423 timewait_info->inserted_remote_id = 1;
424 rb_link_node(&timewait_info->remote_id_node, parent, link);
425 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
426 return NULL;
427}
428
97f52eb4
SH		 429static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
430 __be32 remote_id)
a977049d
HR		 431{
432 struct rb_node *node = cm.remote_id_table.rb_node;
433 struct cm_timewait_info *timewait_info;
434
435 while (node) {
436 timewait_info = rb_entry(node, struct cm_timewait_info,
437 remote_id_node);
438 if (remote_id < timewait_info->work.remote_id)
439 node = node->rb_left;
440 else if (remote_id > timewait_info->work.remote_id)
441 node = node->rb_right;
442 else if (remote_ca_guid < timewait_info->remote_ca_guid)
443 node = node->rb_left;
444 else if (remote_ca_guid > timewait_info->remote_ca_guid)
445 node = node->rb_right;
446 else
447 return timewait_info;
448 }
449 return NULL;
450}
451
452static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
453 *timewait_info)
454{
455 struct rb_node **link = &cm.remote_qp_table.rb_node;
456 struct rb_node *parent = NULL;
457 struct cm_timewait_info *cur_timewait_info;
97f52eb4
SH		 458 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
459 __be32 remote_qpn = timewait_info->remote_qpn;
a977049d
HR		 460
461 while (*link) {
462 parent = *link;
463 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
464 remote_qp_node);
465 if (remote_qpn < cur_timewait_info->remote_qpn)
466 link = &(*link)->rb_left;
467 else if (remote_qpn > cur_timewait_info->remote_qpn)
468 link = &(*link)->rb_right;
469 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
470 link = &(*link)->rb_left;
471 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
472 link = &(*link)->rb_right;
473 else
474 return cur_timewait_info;
475 }
476 timewait_info->inserted_remote_qp = 1;
477 rb_link_node(&timewait_info->remote_qp_node, parent, link);
478 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
479 return NULL;
480}
481
482static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
483 *cm_id_priv)
484{
485 struct rb_node **link = &cm.remote_sidr_table.rb_node;
486 struct rb_node *parent = NULL;
487 struct cm_id_private *cur_cm_id_priv;
488 union ib_gid *port_gid = &cm_id_priv->av.dgid;
97f52eb4 489 __be32 remote_id = cm_id_priv->id.remote_id;
a977049d
HR		 490
491 while (*link) {
492 parent = *link;
493 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
494 sidr_id_node);
495 if (remote_id < cur_cm_id_priv->id.remote_id)
496 link = &(*link)->rb_left;
497 else if (remote_id > cur_cm_id_priv->id.remote_id)
498 link = &(*link)->rb_right;
499 else {
500 int cmp;
501 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
502 sizeof *port_gid);
503 if (cmp < 0)
504 link = &(*link)->rb_left;
505 else if (cmp > 0)
506 link = &(*link)->rb_right;
507 else
508 return cur_cm_id_priv;
509 }
510 }
511 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
512 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
513 return NULL;
514}
515
516static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
517 enum ib_cm_sidr_status status)
518{
519 struct ib_cm_sidr_rep_param param;
520
521 memset(&param, 0, sizeof param);
522 param.status = status;
523 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
524}
525
526struct ib_cm_id *ib_create_cm_id(ib_cm_handler cm_handler,
527 void *context)
528{
529 struct cm_id_private *cm_id_priv;
530 int ret;
531
532 cm_id_priv = kmalloc(sizeof *cm_id_priv, GFP_KERNEL);
533 if (!cm_id_priv)
534 return ERR_PTR(-ENOMEM);
535
536 memset(cm_id_priv, 0, sizeof *cm_id_priv);
537 cm_id_priv->id.state = IB_CM_IDLE;
538 cm_id_priv->id.cm_handler = cm_handler;
539 cm_id_priv->id.context = context;
354ba39c 540 cm_id_priv->id.remote_cm_qpn = 1;
a977049d
HR		 541 ret = cm_alloc_id(cm_id_priv);
542 if (ret)
543 goto error;
544
545 spin_lock_init(&cm_id_priv->lock);
546 init_waitqueue_head(&cm_id_priv->wait);
547 INIT_LIST_HEAD(&cm_id_priv->work_list);
548 atomic_set(&cm_id_priv->work_count, -1);
549 atomic_set(&cm_id_priv->refcount, 1);
550 return &cm_id_priv->id;
551
552error:
553 kfree(cm_id_priv);
554 return ERR_PTR(-ENOMEM);
555}
556EXPORT_SYMBOL(ib_create_cm_id);
557
558static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
559{
560 struct cm_work *work;
561
562 if (list_empty(&cm_id_priv->work_list))
563 return NULL;
564
565 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
566 list_del(&work->list);
567 return work;
568}
569
570static void cm_free_work(struct cm_work *work)
571{
572 if (work->mad_recv_wc)
573 ib_free_recv_mad(work->mad_recv_wc);
574 kfree(work);
575}
576
577static inline int cm_convert_to_ms(int iba_time)
578{
579 /* approximate conversion to ms from 4.096us x 2^iba_time */
580 return 1 << max(iba_time - 8, 0);
581}
582
583static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
584{
585 unsigned long flags;
586
587 if (!timewait_info->inserted_remote_id &&
588 !timewait_info->inserted_remote_qp)
589 return;
590
591 spin_lock_irqsave(&cm.lock, flags);
592 if (timewait_info->inserted_remote_id) {
593 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
594 timewait_info->inserted_remote_id = 0;
595 }
596
597 if (timewait_info->inserted_remote_qp) {
598 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
599 timewait_info->inserted_remote_qp = 0;
600 }
601 spin_unlock_irqrestore(&cm.lock, flags);
602}
603
97f52eb4 604static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
a977049d
HR		 605{
606 struct cm_timewait_info *timewait_info;
607
608 timewait_info = kmalloc(sizeof *timewait_info, GFP_KERNEL);
609 if (!timewait_info)
610 return ERR_PTR(-ENOMEM);
611 memset(timewait_info, 0, sizeof *timewait_info);
612
613 timewait_info->work.local_id = local_id;
614 INIT_WORK(&timewait_info->work.work, cm_work_handler,
615 &timewait_info->work);
616 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
617 return timewait_info;
618}
619
620static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
621{
622 int wait_time;
623
624 /*
625 * The cm_id could be destroyed by the user before we exit timewait.
626 * To protect against this, we search for the cm_id after exiting
627 * timewait before notifying the user that we've exited timewait.
628 */
629 cm_id_priv->id.state = IB_CM_TIMEWAIT;
630 wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
631 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
632 msecs_to_jiffies(wait_time));
633 cm_id_priv->timewait_info = NULL;
634}
635
636static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
637{
638 cm_id_priv->id.state = IB_CM_IDLE;
639 if (cm_id_priv->timewait_info) {
640 cm_cleanup_timewait(cm_id_priv->timewait_info);
641 kfree(cm_id_priv->timewait_info);
642 cm_id_priv->timewait_info = NULL;
643 }
644}
645
646void ib_destroy_cm_id(struct ib_cm_id *cm_id)
647{
648 struct cm_id_private *cm_id_priv;
649 struct cm_work *work;
650 unsigned long flags;
651
652 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
653retest:
654 spin_lock_irqsave(&cm_id_priv->lock, flags);
655 switch (cm_id->state) {
656 case IB_CM_LISTEN:
657 cm_id->state = IB_CM_IDLE;
658 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
659 spin_lock_irqsave(&cm.lock, flags);
660 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
661 spin_unlock_irqrestore(&cm.lock, flags);
662 break;
663 case IB_CM_SIDR_REQ_SENT:
664 cm_id->state = IB_CM_IDLE;
665 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
666 (unsigned long) cm_id_priv->msg);
667 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
668 break;
669 case IB_CM_SIDR_REQ_RCVD:
670 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
671 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
672 break;
673 case IB_CM_REQ_SENT:
674 case IB_CM_MRA_REQ_RCVD:
675 case IB_CM_REP_SENT:
676 case IB_CM_MRA_REP_RCVD:
677 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
678 (unsigned long) cm_id_priv->msg);
679 /* Fall through */
680 case IB_CM_REQ_RCVD:
681 case IB_CM_MRA_REQ_SENT:
682 case IB_CM_REP_RCVD:
683 case IB_CM_MRA_REP_SENT:
684 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
685 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
686 &cm_id_priv->av.port->cm_dev->ca_guid,
687 sizeof cm_id_priv->av.port->cm_dev->ca_guid,
688 NULL, 0);
689 break;
690 case IB_CM_ESTABLISHED:
691 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
692 ib_send_cm_dreq(cm_id, NULL, 0);
693 goto retest;
694 case IB_CM_DREQ_SENT:
695 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
696 (unsigned long) cm_id_priv->msg);
697 cm_enter_timewait(cm_id_priv);
698 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
699 break;
700 case IB_CM_DREQ_RCVD:
701 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
702 ib_send_cm_drep(cm_id, NULL, 0);
703 break;
704 default:
705 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
706 break;
707 }
708
709 cm_free_id(cm_id->local_id);
710 atomic_dec(&cm_id_priv->refcount);
711 wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount));
712 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
713 cm_free_work(work);
714 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
715 kfree(cm_id_priv->private_data);
716 kfree(cm_id_priv);
717}
718EXPORT_SYMBOL(ib_destroy_cm_id);
719
720int ib_cm_listen(struct ib_cm_id *cm_id,
97f52eb4
SH		 721 __be64 service_id,
722 __be64 service_mask)
a977049d
HR		 723{
724 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
725 unsigned long flags;
726 int ret = 0;
727
97f52eb4
SH		 728 service_mask = service_mask ? service_mask :
729 __constant_cpu_to_be64(~0ULL);
a977049d
HR		 730 service_id &= service_mask;
731 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
732 (service_id != IB_CM_ASSIGN_SERVICE_ID))
733 return -EINVAL;
734
735 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
736 BUG_ON(cm_id->state != IB_CM_IDLE);
737
738 cm_id->state = IB_CM_LISTEN;
739
740 spin_lock_irqsave(&cm.lock, flags);
741 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
97f52eb4
SH		 742 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
743 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 744 } else {
745 cm_id->service_id = service_id;
746 cm_id->service_mask = service_mask;
747 }
748 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
749 spin_unlock_irqrestore(&cm.lock, flags);
750
751 if (cur_cm_id_priv) {
752 cm_id->state = IB_CM_IDLE;
753 ret = -EBUSY;
754 }
755 return ret;
756}
757EXPORT_SYMBOL(ib_cm_listen);
758
97f52eb4
SH		 759static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
760 enum cm_msg_sequence msg_seq)
a977049d
HR		 761{
762 u64 hi_tid, low_tid;
763
764 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
97f52eb4
SH		 765 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
766 (msg_seq << 30));
a977049d
HR		 767 return cpu_to_be64(hi_tid | low_tid);
768}
769
770static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
97f52eb4 771 __be16 attr_id, __be64 tid)
a977049d
HR		 772{
773 hdr->base_version = IB_MGMT_BASE_VERSION;
774 hdr->mgmt_class = IB_MGMT_CLASS_CM;
775 hdr->class_version = IB_CM_CLASS_VERSION;
776 hdr->method = IB_MGMT_METHOD_SEND;
777 hdr->attr_id = attr_id;
778 hdr->tid = tid;
779}
780
781static void cm_format_req(struct cm_req_msg *req_msg,
782 struct cm_id_private *cm_id_priv,
783 struct ib_cm_req_param *param)
784{
785 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
786 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
787
788 req_msg->local_comm_id = cm_id_priv->id.local_id;
789 req_msg->service_id = param->service_id;
790 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
791 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
792 cm_req_set_resp_res(req_msg, param->responder_resources);
793 cm_req_set_init_depth(req_msg, param->initiator_depth);
794 cm_req_set_remote_resp_timeout(req_msg,
795 param->remote_cm_response_timeout);
796 cm_req_set_qp_type(req_msg, param->qp_type);
797 cm_req_set_flow_ctrl(req_msg, param->flow_control);
798 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
799 cm_req_set_local_resp_timeout(req_msg,
800 param->local_cm_response_timeout);
801 cm_req_set_retry_count(req_msg, param->retry_count);
802 req_msg->pkey = param->primary_path->pkey;
803 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
804 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
805 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
806 cm_req_set_srq(req_msg, param->srq);
807
808 req_msg->primary_local_lid = param->primary_path->slid;
809 req_msg->primary_remote_lid = param->primary_path->dlid;
810 req_msg->primary_local_gid = param->primary_path->sgid;
811 req_msg->primary_remote_gid = param->primary_path->dgid;
812 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
813 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
814 req_msg->primary_traffic_class = param->primary_path->traffic_class;
815 req_msg->primary_hop_limit = param->primary_path->hop_limit;
816 cm_req_set_primary_sl(req_msg, param->primary_path->sl);
817 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
818 cm_req_set_primary_local_ack_timeout(req_msg,
819 min(31, param->primary_path->packet_life_time + 1));
820
821 if (param->alternate_path) {
822 req_msg->alt_local_lid = param->alternate_path->slid;
823 req_msg->alt_remote_lid = param->alternate_path->dlid;
824 req_msg->alt_local_gid = param->alternate_path->sgid;
825 req_msg->alt_remote_gid = param->alternate_path->dgid;
826 cm_req_set_alt_flow_label(req_msg,
827 param->alternate_path->flow_label);
828 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
829 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
830 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
831 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
832 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
833 cm_req_set_alt_local_ack_timeout(req_msg,
834 min(31, param->alternate_path->packet_life_time + 1));
835 }
836
837 if (param->private_data && param->private_data_len)
838 memcpy(req_msg->private_data, param->private_data,
839 param->private_data_len);
840}
841
842static inline int cm_validate_req_param(struct ib_cm_req_param *param)
843{
844 /* peer-to-peer not supported */
845 if (param->peer_to_peer)
846 return -EINVAL;
847
848 if (!param->primary_path)
849 return -EINVAL;
850
851 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
852 return -EINVAL;
853
854 if (param->private_data &&
855 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
856 return -EINVAL;
857
858 if (param->alternate_path &&
859 (param->alternate_path->pkey != param->primary_path->pkey ||
860 param->alternate_path->mtu != param->primary_path->mtu))
861 return -EINVAL;
862
863 return 0;
864}
865
866int ib_send_cm_req(struct ib_cm_id *cm_id,
867 struct ib_cm_req_param *param)
868{
869 struct cm_id_private *cm_id_priv;
870 struct ib_send_wr *bad_send_wr;
871 struct cm_req_msg *req_msg;
872 unsigned long flags;
873 int ret;
874
875 ret = cm_validate_req_param(param);
876 if (ret)
877 return ret;
878
879 /* Verify that we're not in timewait. */
880 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
881 spin_lock_irqsave(&cm_id_priv->lock, flags);
882 if (cm_id->state != IB_CM_IDLE) {
883 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
884 ret = -EINVAL;
885 goto out;
886 }
887 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
888
889 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
890 id.local_id);
891 if (IS_ERR(cm_id_priv->timewait_info))
892 goto out;
893
894 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
895 if (ret)
896 goto error1;
897 if (param->alternate_path) {
898 ret = cm_init_av_by_path(param->alternate_path,
899 &cm_id_priv->alt_av);
900 if (ret)
901 goto error1;
902 }
903 cm_id->service_id = param->service_id;
97f52eb4 904 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 905 cm_id_priv->timeout_ms = cm_convert_to_ms(
906 param->primary_path->packet_life_time) * 2 +
907 cm_convert_to_ms(
908 param->remote_cm_response_timeout);
909 cm_id_priv->max_cm_retries = param->max_cm_retries;
910 cm_id_priv->initiator_depth = param->initiator_depth;
911 cm_id_priv->responder_resources = param->responder_resources;
912 cm_id_priv->retry_count = param->retry_count;
913 cm_id_priv->path_mtu = param->primary_path->mtu;
914
915 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
916 if (ret)
917 goto error1;
918
919 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
920 cm_format_req(req_msg, cm_id_priv, param);
921 cm_id_priv->tid = req_msg->hdr.tid;
922 cm_id_priv->msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
923 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
924
925 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
926 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
927 cm_id_priv->local_ack_timeout =
928 cm_req_get_primary_local_ack_timeout(req_msg);
929
930 spin_lock_irqsave(&cm_id_priv->lock, flags);
931 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
932 &cm_id_priv->msg->send_wr, &bad_send_wr);
933 if (ret) {
934 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
935 goto error2;
936 }
937 BUG_ON(cm_id->state != IB_CM_IDLE);
938 cm_id->state = IB_CM_REQ_SENT;
939 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
940 return 0;
941
942error2: cm_free_msg(cm_id_priv->msg);
943error1: kfree(cm_id_priv->timewait_info);
944out: return ret;
945}
946EXPORT_SYMBOL(ib_send_cm_req);
947
948static int cm_issue_rej(struct cm_port *port,
949 struct ib_mad_recv_wc *mad_recv_wc,
950 enum ib_cm_rej_reason reason,
951 enum cm_msg_response msg_rejected,
952 void *ari, u8 ari_length)
953{
954 struct ib_mad_send_buf *msg = NULL;
955 struct ib_send_wr *bad_send_wr;
956 struct cm_rej_msg *rej_msg, *rcv_msg;
957 int ret;
958
959 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
960 if (ret)
961 return ret;
962
963 /* We just need common CM header information. Cast to any message. */
964 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
965 rej_msg = (struct cm_rej_msg *) msg->mad;
966
967 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
968 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
969 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
970 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
97f52eb4 971 rej_msg->reason = cpu_to_be16(reason);
a977049d
HR		 972
973 if (ari && ari_length) {
974 cm_rej_set_reject_info_len(rej_msg, ari_length);
975 memcpy(rej_msg->ari, ari, ari_length);
976 }
977
978 ret = ib_post_send_mad(port->mad_agent, &msg->send_wr, &bad_send_wr);
979 if (ret)
980 cm_free_msg(msg);
981
982 return ret;
983}
984
97f52eb4
SH		 985static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
986 __be32 local_qpn, __be32 remote_qpn)
a977049d
HR		 987{
988 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
989 ((local_ca_guid == remote_ca_guid) &&
990 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
991}
992
993static inline void cm_format_paths_from_req(struct cm_req_msg *req_msg,
994 struct ib_sa_path_rec *primary_path,
995 struct ib_sa_path_rec *alt_path)
996{
997 memset(primary_path, 0, sizeof *primary_path);
998 primary_path->dgid = req_msg->primary_local_gid;
999 primary_path->sgid = req_msg->primary_remote_gid;
1000 primary_path->dlid = req_msg->primary_local_lid;
1001 primary_path->slid = req_msg->primary_remote_lid;
1002 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1003 primary_path->hop_limit = req_msg->primary_hop_limit;
1004 primary_path->traffic_class = req_msg->primary_traffic_class;
1005 primary_path->reversible = 1;
1006 primary_path->pkey = req_msg->pkey;
1007 primary_path->sl = cm_req_get_primary_sl(req_msg);
1008 primary_path->mtu_selector = IB_SA_EQ;
1009 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1010 primary_path->rate_selector = IB_SA_EQ;
1011 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1012 primary_path->packet_life_time_selector = IB_SA_EQ;
1013 primary_path->packet_life_time =
1014 cm_req_get_primary_local_ack_timeout(req_msg);
1015 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1016
1017 if (req_msg->alt_local_lid) {
1018 memset(alt_path, 0, sizeof *alt_path);
1019 alt_path->dgid = req_msg->alt_local_gid;
1020 alt_path->sgid = req_msg->alt_remote_gid;
1021 alt_path->dlid = req_msg->alt_local_lid;
1022 alt_path->slid = req_msg->alt_remote_lid;
1023 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1024 alt_path->hop_limit = req_msg->alt_hop_limit;
1025 alt_path->traffic_class = req_msg->alt_traffic_class;
1026 alt_path->reversible = 1;
1027 alt_path->pkey = req_msg->pkey;
1028 alt_path->sl = cm_req_get_alt_sl(req_msg);
1029 alt_path->mtu_selector = IB_SA_EQ;
1030 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1031 alt_path->rate_selector = IB_SA_EQ;
1032 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1033 alt_path->packet_life_time_selector = IB_SA_EQ;
1034 alt_path->packet_life_time =
1035 cm_req_get_alt_local_ack_timeout(req_msg);
1036 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1037 }
1038}
1039
1040static void cm_format_req_event(struct cm_work *work,
1041 struct cm_id_private *cm_id_priv,
1042 struct ib_cm_id *listen_id)
1043{
1044 struct cm_req_msg *req_msg;
1045 struct ib_cm_req_event_param *param;
1046
1047 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1048 param = &work->cm_event.param.req_rcvd;
1049 param->listen_id = listen_id;
1050 param->device = cm_id_priv->av.port->mad_agent->device;
1051 param->port = cm_id_priv->av.port->port_num;
1052 param->primary_path = &work->path[0];
1053 if (req_msg->alt_local_lid)
1054 param->alternate_path = &work->path[1];
1055 else
1056 param->alternate_path = NULL;
1057 param->remote_ca_guid = req_msg->local_ca_guid;
1058 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1059 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1060 param->qp_type = cm_req_get_qp_type(req_msg);
1061 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1062 param->responder_resources = cm_req_get_init_depth(req_msg);
1063 param->initiator_depth = cm_req_get_resp_res(req_msg);
1064 param->local_cm_response_timeout =
1065 cm_req_get_remote_resp_timeout(req_msg);
1066 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1067 param->remote_cm_response_timeout =
1068 cm_req_get_local_resp_timeout(req_msg);
1069 param->retry_count = cm_req_get_retry_count(req_msg);
1070 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1071 param->srq = cm_req_get_srq(req_msg);
1072 work->cm_event.private_data = &req_msg->private_data;
1073}
1074
1075static void cm_process_work(struct cm_id_private *cm_id_priv,
1076 struct cm_work *work)
1077{
1078 unsigned long flags;
1079 int ret;
1080
1081 /* We will typically only have the current event to report. */
1082 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1083 cm_free_work(work);
1084
1085 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1086 spin_lock_irqsave(&cm_id_priv->lock, flags);
1087 work = cm_dequeue_work(cm_id_priv);
1088 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1089 BUG_ON(!work);
1090 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1091 &work->cm_event);
1092 cm_free_work(work);
1093 }
1094 cm_deref_id(cm_id_priv);
1095 if (ret)
1096 ib_destroy_cm_id(&cm_id_priv->id);
1097}
1098
1099static void cm_format_mra(struct cm_mra_msg *mra_msg,
1100 struct cm_id_private *cm_id_priv,
1101 enum cm_msg_response msg_mraed, u8 service_timeout,
1102 const void *private_data, u8 private_data_len)
1103{
1104 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1105 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1106 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1107 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1108 cm_mra_set_service_timeout(mra_msg, service_timeout);
1109
1110 if (private_data && private_data_len)
1111 memcpy(mra_msg->private_data, private_data, private_data_len);
1112}
1113
1114static void cm_format_rej(struct cm_rej_msg *rej_msg,
1115 struct cm_id_private *cm_id_priv,
1116 enum ib_cm_rej_reason reason,
1117 void *ari,
1118 u8 ari_length,
1119 const void *private_data,
1120 u8 private_data_len)
1121{
1122 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1123 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1124
1125 switch(cm_id_priv->id.state) {
1126 case IB_CM_REQ_RCVD:
1127 rej_msg->local_comm_id = 0;
1128 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1129 break;
1130 case IB_CM_MRA_REQ_SENT:
1131 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1132 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1133 break;
1134 case IB_CM_REP_RCVD:
1135 case IB_CM_MRA_REP_SENT:
1136 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1137 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1138 break;
1139 default:
1140 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1141 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1142 break;
1143 }
1144
97f52eb4 1145 rej_msg->reason = cpu_to_be16(reason);
a977049d
HR		 1146 if (ari && ari_length) {
1147 cm_rej_set_reject_info_len(rej_msg, ari_length);
1148 memcpy(rej_msg->ari, ari, ari_length);
1149 }
1150
1151 if (private_data && private_data_len)
1152 memcpy(rej_msg->private_data, private_data, private_data_len);
1153}
1154
1155static void cm_dup_req_handler(struct cm_work *work,
1156 struct cm_id_private *cm_id_priv)
1157{
1158 struct ib_mad_send_buf *msg = NULL;
1159 struct ib_send_wr *bad_send_wr;
1160 unsigned long flags;
1161 int ret;
1162
1163 /* Quick state check to discard duplicate REQs. */
1164 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1165 return;
1166
1167 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1168 if (ret)
1169 return;
1170
1171 spin_lock_irqsave(&cm_id_priv->lock, flags);
1172 switch (cm_id_priv->id.state) {
1173 case IB_CM_MRA_REQ_SENT:
1174 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1175 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1176 cm_id_priv->private_data,
1177 cm_id_priv->private_data_len);
1178 break;
1179 case IB_CM_TIMEWAIT:
1180 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1181 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1182 break;
1183 default:
1184 goto unlock;
1185 }
1186 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1187
1188 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
1189 &bad_send_wr);
1190 if (ret)
1191 goto free;
1192 return;
1193
1194unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1195free: cm_free_msg(msg);
1196}
1197
1198static struct cm_id_private * cm_match_req(struct cm_work *work,
1199 struct cm_id_private *cm_id_priv)
1200{
1201 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1202 struct cm_timewait_info *timewait_info;
1203 struct cm_req_msg *req_msg;
1204 unsigned long flags;
1205
1206 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1207
1208 /* Check for duplicate REQ and stale connections. */
1209 spin_lock_irqsave(&cm.lock, flags);
1210 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1211 if (!timewait_info)
1212 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1213
1214 if (timewait_info) {
1215 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1216 timewait_info->work.remote_id);
1217 spin_unlock_irqrestore(&cm.lock, flags);
1218 if (cur_cm_id_priv) {
1219 cm_dup_req_handler(work, cur_cm_id_priv);
1220 cm_deref_id(cur_cm_id_priv);
1221 } else
1222 cm_issue_rej(work->port, work->mad_recv_wc,
1223 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1224 NULL, 0);
1225 goto error;
1226 }
1227
1228 /* Find matching listen request. */
1229 listen_cm_id_priv = cm_find_listen(req_msg->service_id);
1230 if (!listen_cm_id_priv) {
1231 spin_unlock_irqrestore(&cm.lock, flags);
1232 cm_issue_rej(work->port, work->mad_recv_wc,
1233 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1234 NULL, 0);
1235 goto error;
1236 }
1237 atomic_inc(&listen_cm_id_priv->refcount);
1238 atomic_inc(&cm_id_priv->refcount);
1239 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1240 atomic_inc(&cm_id_priv->work_count);
1241 spin_unlock_irqrestore(&cm.lock, flags);
1242 return listen_cm_id_priv;
1243
1244error: cm_cleanup_timewait(cm_id_priv->timewait_info);
1245 return NULL;
1246}
1247
1248static int cm_req_handler(struct cm_work *work)
1249{
1250 struct ib_cm_id *cm_id;
1251 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1252 struct cm_req_msg *req_msg;
1253 int ret;
1254
1255 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1256
1257 cm_id = ib_create_cm_id(NULL, NULL);
1258 if (IS_ERR(cm_id))
1259 return PTR_ERR(cm_id);
1260
1261 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1262 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1263 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1264 &cm_id_priv->av);
1265 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1266 id.local_id);
1267 if (IS_ERR(cm_id_priv->timewait_info)) {
1268 ret = PTR_ERR(cm_id_priv->timewait_info);
1269 goto error1;
1270 }
1271 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1272 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1273 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1274
1275 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1276 if (!listen_cm_id_priv) {
1277 ret = -EINVAL;
1278 goto error2;
1279 }
1280
1281 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1282 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1283 cm_id_priv->id.service_id = req_msg->service_id;
97f52eb4 1284 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 1285
1286 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1287 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1288 if (ret)
1289 goto error3;
1290 if (req_msg->alt_local_lid) {
1291 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1292 if (ret)
1293 goto error3;
1294 }
1295 cm_id_priv->tid = req_msg->hdr.tid;
1296 cm_id_priv->timeout_ms = cm_convert_to_ms(
1297 cm_req_get_local_resp_timeout(req_msg));
1298 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1299 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1300 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1301 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1302 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1303 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1304 cm_id_priv->local_ack_timeout =
1305 cm_req_get_primary_local_ack_timeout(req_msg);
1306 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1307 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1308
1309 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1310 cm_process_work(cm_id_priv, work);
1311 cm_deref_id(listen_cm_id_priv);
1312 return 0;
1313
1314error3: atomic_dec(&cm_id_priv->refcount);
1315 cm_deref_id(listen_cm_id_priv);
1316 cm_cleanup_timewait(cm_id_priv->timewait_info);
1317error2: kfree(cm_id_priv->timewait_info);
1b205c2d 1318 cm_id_priv->timewait_info = NULL;
a977049d
HR		 1319error1: ib_destroy_cm_id(&cm_id_priv->id);
1320 return ret;
1321}
1322
1323static void cm_format_rep(struct cm_rep_msg *rep_msg,
1324 struct cm_id_private *cm_id_priv,
1325 struct ib_cm_rep_param *param)
1326{
1327 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1328 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1329 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1330 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1331 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1332 rep_msg->resp_resources = param->responder_resources;
1333 rep_msg->initiator_depth = param->initiator_depth;
1334 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1335 cm_rep_set_failover(rep_msg, param->failover_accepted);
1336 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1337 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1338 cm_rep_set_srq(rep_msg, param->srq);
1339 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1340
1341 if (param->private_data && param->private_data_len)
1342 memcpy(rep_msg->private_data, param->private_data,
1343 param->private_data_len);
1344}
1345
1346int ib_send_cm_rep(struct ib_cm_id *cm_id,
1347 struct ib_cm_rep_param *param)
1348{
1349 struct cm_id_private *cm_id_priv;
1350 struct ib_mad_send_buf *msg;
1351 struct cm_rep_msg *rep_msg;
1352 struct ib_send_wr *bad_send_wr;
1353 unsigned long flags;
1354 int ret;
1355
1356 if (param->private_data &&
1357 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1358 return -EINVAL;
1359
1360 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1361 spin_lock_irqsave(&cm_id_priv->lock, flags);
1362 if (cm_id->state != IB_CM_REQ_RCVD &&
1363 cm_id->state != IB_CM_MRA_REQ_SENT) {
1364 ret = -EINVAL;
1365 goto out;
1366 }
1367
1368 ret = cm_alloc_msg(cm_id_priv, &msg);
1369 if (ret)
1370 goto out;
1371
1372 rep_msg = (struct cm_rep_msg *) msg->mad;
1373 cm_format_rep(rep_msg, cm_id_priv, param);
1374 msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
1375 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1376
1377 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1378 &msg->send_wr, &bad_send_wr);
1379 if (ret) {
1380 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1381 cm_free_msg(msg);
1382 return ret;
1383 }
1384
1385 cm_id->state = IB_CM_REP_SENT;
1386 cm_id_priv->msg = msg;
1387 cm_id_priv->initiator_depth = param->initiator_depth;
1388 cm_id_priv->responder_resources = param->responder_resources;
1389 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1390 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1391
1392out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1393 return ret;
1394}
1395EXPORT_SYMBOL(ib_send_cm_rep);
1396
1397static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1398 struct cm_id_private *cm_id_priv,
1399 const void *private_data,
1400 u8 private_data_len)
1401{
1402 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1403 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1404 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1405
1406 if (private_data && private_data_len)
1407 memcpy(rtu_msg->private_data, private_data, private_data_len);
1408}
1409
1410int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1411 const void *private_data,
1412 u8 private_data_len)
1413{
1414 struct cm_id_private *cm_id_priv;
1415 struct ib_mad_send_buf *msg;
1416 struct ib_send_wr *bad_send_wr;
1417 unsigned long flags;
1418 void *data;
1419 int ret;
1420
1421 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1422 return -EINVAL;
1423
1424 data = cm_copy_private_data(private_data, private_data_len);
1425 if (IS_ERR(data))
1426 return PTR_ERR(data);
1427
1428 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1429 spin_lock_irqsave(&cm_id_priv->lock, flags);
1430 if (cm_id->state != IB_CM_REP_RCVD &&
1431 cm_id->state != IB_CM_MRA_REP_SENT) {
1432 ret = -EINVAL;
1433 goto error;
1434 }
1435
1436 ret = cm_alloc_msg(cm_id_priv, &msg);
1437 if (ret)
1438 goto error;
1439
1440 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1441 private_data, private_data_len);
1442
1443 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1444 &msg->send_wr, &bad_send_wr);
1445 if (ret) {
1446 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1447 cm_free_msg(msg);
1448 kfree(data);
1449 return ret;
1450 }
1451
1452 cm_id->state = IB_CM_ESTABLISHED;
1453 cm_set_private_data(cm_id_priv, data, private_data_len);
1454 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1455 return 0;
1456
1457error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1458 kfree(data);
1459 return ret;
1460}
1461EXPORT_SYMBOL(ib_send_cm_rtu);
1462
1463static void cm_format_rep_event(struct cm_work *work)
1464{
1465 struct cm_rep_msg *rep_msg;
1466 struct ib_cm_rep_event_param *param;
1467
1468 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1469 param = &work->cm_event.param.rep_rcvd;
1470 param->remote_ca_guid = rep_msg->local_ca_guid;
1471 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1472 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1473 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1474 param->responder_resources = rep_msg->initiator_depth;
1475 param->initiator_depth = rep_msg->resp_resources;
1476 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1477 param->failover_accepted = cm_rep_get_failover(rep_msg);
1478 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1479 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1480 param->srq = cm_rep_get_srq(rep_msg);
1481 work->cm_event.private_data = &rep_msg->private_data;
1482}
1483
1484static void cm_dup_rep_handler(struct cm_work *work)
1485{
1486 struct cm_id_private *cm_id_priv;
1487 struct cm_rep_msg *rep_msg;
1488 struct ib_mad_send_buf *msg = NULL;
1489 struct ib_send_wr *bad_send_wr;
1490 unsigned long flags;
1491 int ret;
1492
1493 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1494 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1495 rep_msg->local_comm_id);
1496 if (!cm_id_priv)
1497 return;
1498
1499 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1500 if (ret)
1501 goto deref;
1502
1503 spin_lock_irqsave(&cm_id_priv->lock, flags);
1504 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1505 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1506 cm_id_priv->private_data,
1507 cm_id_priv->private_data_len);
1508 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1509 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1510 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1511 cm_id_priv->private_data,
1512 cm_id_priv->private_data_len);
1513 else
1514 goto unlock;
1515 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1516
1517 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
1518 &bad_send_wr);
1519 if (ret)
1520 goto free;
1521 goto deref;
1522
1523unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1524free: cm_free_msg(msg);
1525deref: cm_deref_id(cm_id_priv);
1526}
1527
1528static int cm_rep_handler(struct cm_work *work)
1529{
1530 struct cm_id_private *cm_id_priv;
1531 struct cm_rep_msg *rep_msg;
1532 unsigned long flags;
1533 int ret;
1534
1535 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1536 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1537 if (!cm_id_priv) {
1538 cm_dup_rep_handler(work);
1539 return -EINVAL;
1540 }
1541
1542 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1543 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1544 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1545
1546 spin_lock_irqsave(&cm.lock, flags);
1547 /* Check for duplicate REP. */
1548 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1549 spin_unlock_irqrestore(&cm.lock, flags);
1550 ret = -EINVAL;
1551 goto error;
1552 }
1553 /* Check for a stale connection. */
1554 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1555 spin_unlock_irqrestore(&cm.lock, flags);
1556 cm_issue_rej(work->port, work->mad_recv_wc,
1557 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1558 NULL, 0);
1559 ret = -EINVAL;
1560 goto error;
1561 }
1562 spin_unlock_irqrestore(&cm.lock, flags);
1563
1564 cm_format_rep_event(work);
1565
1566 spin_lock_irqsave(&cm_id_priv->lock, flags);
1567 switch (cm_id_priv->id.state) {
1568 case IB_CM_REQ_SENT:
1569 case IB_CM_MRA_REQ_RCVD:
1570 break;
1571 default:
1572 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1573 ret = -EINVAL;
1574 goto error;
1575 }
1576 cm_id_priv->id.state = IB_CM_REP_RCVD;
1577 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1578 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1579 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1580 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1581 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1582 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1583
1584 /* todo: handle peer_to_peer */
1585
1586 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1587 (unsigned long) cm_id_priv->msg);
1588 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1589 if (!ret)
1590 list_add_tail(&work->list, &cm_id_priv->work_list);
1591 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1592
1593 if (ret)
1594 cm_process_work(cm_id_priv, work);
1595 else
1596 cm_deref_id(cm_id_priv);
1597 return 0;
1598
1599error: cm_cleanup_timewait(cm_id_priv->timewait_info);
1600 cm_deref_id(cm_id_priv);
1601 return ret;
1602}
1603
1604static int cm_establish_handler(struct cm_work *work)
1605{
1606 struct cm_id_private *cm_id_priv;
1607 unsigned long flags;
1608 int ret;
1609
1610 /* See comment in ib_cm_establish about lookup. */
1611 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1612 if (!cm_id_priv)
1613 return -EINVAL;
1614
1615 spin_lock_irqsave(&cm_id_priv->lock, flags);
1616 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1617 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1618 goto out;
1619 }
1620
1621 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1622 (unsigned long) cm_id_priv->msg);
1623 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1624 if (!ret)
1625 list_add_tail(&work->list, &cm_id_priv->work_list);
1626 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1627
1628 if (ret)
1629 cm_process_work(cm_id_priv, work);
1630 else
1631 cm_deref_id(cm_id_priv);
1632 return 0;
1633out:
1634 cm_deref_id(cm_id_priv);
1635 return -EINVAL;
1636}
1637
1638static int cm_rtu_handler(struct cm_work *work)
1639{
1640 struct cm_id_private *cm_id_priv;
1641 struct cm_rtu_msg *rtu_msg;
1642 unsigned long flags;
1643 int ret;
1644
1645 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1646 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1647 rtu_msg->local_comm_id);
1648 if (!cm_id_priv)
1649 return -EINVAL;
1650
1651 work->cm_event.private_data = &rtu_msg->private_data;
1652
1653 spin_lock_irqsave(&cm_id_priv->lock, flags);
1654 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1655 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1656 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1657 goto out;
1658 }
1659 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1660
1661 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1662 (unsigned long) cm_id_priv->msg);
1663 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1664 if (!ret)
1665 list_add_tail(&work->list, &cm_id_priv->work_list);
1666 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1667
1668 if (ret)
1669 cm_process_work(cm_id_priv, work);
1670 else
1671 cm_deref_id(cm_id_priv);
1672 return 0;
1673out:
1674 cm_deref_id(cm_id_priv);
1675 return -EINVAL;
1676}
1677
1678static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1679 struct cm_id_private *cm_id_priv,
1680 const void *private_data,
1681 u8 private_data_len)
1682{
1683 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1684 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1685 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1686 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1687 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1688
1689 if (private_data && private_data_len)
1690 memcpy(dreq_msg->private_data, private_data, private_data_len);
1691}
1692
1693int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1694 const void *private_data,
1695 u8 private_data_len)
1696{
1697 struct cm_id_private *cm_id_priv;
1698 struct ib_mad_send_buf *msg;
1699 struct ib_send_wr *bad_send_wr;
1700 unsigned long flags;
1701 int ret;
1702
1703 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1704 return -EINVAL;
1705
1706 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1707 spin_lock_irqsave(&cm_id_priv->lock, flags);
1708 if (cm_id->state != IB_CM_ESTABLISHED) {
1709 ret = -EINVAL;
1710 goto out;
1711 }
1712
1713 ret = cm_alloc_msg(cm_id_priv, &msg);
1714 if (ret) {
1715 cm_enter_timewait(cm_id_priv);
1716 goto out;
1717 }
1718
1719 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1720 private_data, private_data_len);
1721 msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
1722 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1723
1724 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1725 &msg->send_wr, &bad_send_wr);
1726 if (ret) {
1727 cm_enter_timewait(cm_id_priv);
1728 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1729 cm_free_msg(msg);
1730 return ret;
1731 }
1732
1733 cm_id->state = IB_CM_DREQ_SENT;
1734 cm_id_priv->msg = msg;
1735out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1736 return ret;
1737}
1738EXPORT_SYMBOL(ib_send_cm_dreq);
1739
1740static void cm_format_drep(struct cm_drep_msg *drep_msg,
1741 struct cm_id_private *cm_id_priv,
1742 const void *private_data,
1743 u8 private_data_len)
1744{
1745 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1746 drep_msg->local_comm_id = cm_id_priv->id.local_id;
1747 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1748
1749 if (private_data && private_data_len)
1750 memcpy(drep_msg->private_data, private_data, private_data_len);
1751}
1752
1753int ib_send_cm_drep(struct ib_cm_id *cm_id,
1754 const void *private_data,
1755 u8 private_data_len)
1756{
1757 struct cm_id_private *cm_id_priv;
1758 struct ib_mad_send_buf *msg;
1759 struct ib_send_wr *bad_send_wr;
1760 unsigned long flags;
1761 void *data;
1762 int ret;
1763
1764 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1765 return -EINVAL;
1766
1767 data = cm_copy_private_data(private_data, private_data_len);
1768 if (IS_ERR(data))
1769 return PTR_ERR(data);
1770
1771 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1772 spin_lock_irqsave(&cm_id_priv->lock, flags);
1773 if (cm_id->state != IB_CM_DREQ_RCVD) {
1774 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1775 kfree(data);
1776 return -EINVAL;
1777 }
1778
1779 cm_set_private_data(cm_id_priv, data, private_data_len);
1780 cm_enter_timewait(cm_id_priv);
1781
1782 ret = cm_alloc_msg(cm_id_priv, &msg);
1783 if (ret)
1784 goto out;
1785
1786 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1787 private_data, private_data_len);
1788
1789 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr,
1790 &bad_send_wr);
1791 if (ret) {
1792 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1793 cm_free_msg(msg);
1794 return ret;
1795 }
1796
1797out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1798 return ret;
1799}
1800EXPORT_SYMBOL(ib_send_cm_drep);
1801
1802static int cm_dreq_handler(struct cm_work *work)
1803{
1804 struct cm_id_private *cm_id_priv;
1805 struct cm_dreq_msg *dreq_msg;
1806 struct ib_mad_send_buf *msg = NULL;
1807 struct ib_send_wr *bad_send_wr;
1808 unsigned long flags;
1809 int ret;
1810
1811 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1812 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1813 dreq_msg->local_comm_id);
1814 if (!cm_id_priv)
1815 return -EINVAL;
1816
1817 work->cm_event.private_data = &dreq_msg->private_data;
1818
1819 spin_lock_irqsave(&cm_id_priv->lock, flags);
1820 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1821 goto unlock;
1822
1823 switch (cm_id_priv->id.state) {
1824 case IB_CM_REP_SENT:
1825 case IB_CM_DREQ_SENT:
1826 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1827 (unsigned long) cm_id_priv->msg);
1828 break;
1829 case IB_CM_ESTABLISHED:
1830 case IB_CM_MRA_REP_RCVD:
1831 break;
1832 case IB_CM_TIMEWAIT:
1833 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1834 goto unlock;
1835
1836 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1837 cm_id_priv->private_data,
1838 cm_id_priv->private_data_len);
1839 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1840
1841 if (ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1842 &msg->send_wr, &bad_send_wr))
1843 cm_free_msg(msg);
1844 goto deref;
1845 default:
1846 goto unlock;
1847 }
1848 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1849 cm_id_priv->tid = dreq_msg->hdr.tid;
1850 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1851 if (!ret)
1852 list_add_tail(&work->list, &cm_id_priv->work_list);
1853 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1854
1855 if (ret)
1856 cm_process_work(cm_id_priv, work);
1857 else
1858 cm_deref_id(cm_id_priv);
1859 return 0;
1860
1861unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1862deref: cm_deref_id(cm_id_priv);
1863 return -EINVAL;
1864}
1865
1866static int cm_drep_handler(struct cm_work *work)
1867{
1868 struct cm_id_private *cm_id_priv;
1869 struct cm_drep_msg *drep_msg;
1870 unsigned long flags;
1871 int ret;
1872
1873 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1874 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1875 drep_msg->local_comm_id);
1876 if (!cm_id_priv)
1877 return -EINVAL;
1878
1879 work->cm_event.private_data = &drep_msg->private_data;
1880
1881 spin_lock_irqsave(&cm_id_priv->lock, flags);
1882 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1883 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1884 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1885 goto out;
1886 }
1887 cm_enter_timewait(cm_id_priv);
1888
1889 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
1890 (unsigned long) cm_id_priv->msg);
1891 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1892 if (!ret)
1893 list_add_tail(&work->list, &cm_id_priv->work_list);
1894 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1895
1896 if (ret)
1897 cm_process_work(cm_id_priv, work);
1898 else
1899 cm_deref_id(cm_id_priv);
1900 return 0;
1901out:
1902 cm_deref_id(cm_id_priv);
1903 return -EINVAL;
1904}
1905
1906int ib_send_cm_rej(struct ib_cm_id *cm_id,
1907 enum ib_cm_rej_reason reason,
1908 void *ari,
1909 u8 ari_length,
1910 const void *private_data,
1911 u8 private_data_len)
1912{
1913 struct cm_id_private *cm_id_priv;
1914 struct ib_mad_send_buf *msg;
1915 struct ib_send_wr *bad_send_wr;
1916 unsigned long flags;
1917 int ret;
1918
1919 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
1920 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
1921 return -EINVAL;
1922
1923 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1924
1925 spin_lock_irqsave(&cm_id_priv->lock, flags);
1926 switch (cm_id->state) {
1927 case IB_CM_REQ_SENT:
1928 case IB_CM_MRA_REQ_RCVD:
1929 case IB_CM_REQ_RCVD:
1930 case IB_CM_MRA_REQ_SENT:
1931 case IB_CM_REP_RCVD:
1932 case IB_CM_MRA_REP_SENT:
1933 ret = cm_alloc_msg(cm_id_priv, &msg);
1934 if (!ret)
1935 cm_format_rej((struct cm_rej_msg *) msg->mad,
1936 cm_id_priv, reason, ari, ari_length,
1937 private_data, private_data_len);
1938
1939 cm_reset_to_idle(cm_id_priv);
1940 break;
1941 case IB_CM_REP_SENT:
1942 case IB_CM_MRA_REP_RCVD:
1943 ret = cm_alloc_msg(cm_id_priv, &msg);
1944 if (!ret)
1945 cm_format_rej((struct cm_rej_msg *) msg->mad,
1946 cm_id_priv, reason, ari, ari_length,
1947 private_data, private_data_len);
1948
1949 cm_enter_timewait(cm_id_priv);
1950 break;
1951 default:
1952 ret = -EINVAL;
1953 goto out;
1954 }
1955
1956 if (ret)
1957 goto out;
1958
1959 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
1960 &msg->send_wr, &bad_send_wr);
1961 if (ret)
1962 cm_free_msg(msg);
1963
1964out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1965 return ret;
1966}
1967EXPORT_SYMBOL(ib_send_cm_rej);
1968
1969static void cm_format_rej_event(struct cm_work *work)
1970{
1971 struct cm_rej_msg *rej_msg;
1972 struct ib_cm_rej_event_param *param;
1973
1974 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
1975 param = &work->cm_event.param.rej_rcvd;
1976 param->ari = rej_msg->ari;
1977 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
97f52eb4 1978 param->reason = __be16_to_cpu(rej_msg->reason);
a977049d
HR		 1979 work->cm_event.private_data = &rej_msg->private_data;
1980}
1981
1982static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
1983{
1984 struct cm_timewait_info *timewait_info;
1985 struct cm_id_private *cm_id_priv;
1986 unsigned long flags;
97f52eb4 1987 __be32 remote_id;
a977049d
HR		 1988
1989 remote_id = rej_msg->local_comm_id;
1990
97f52eb4 1991 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
a977049d 1992 spin_lock_irqsave(&cm.lock, flags);
97f52eb4 1993 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
a977049d
HR		 1994 remote_id);
1995 if (!timewait_info) {
1996 spin_unlock_irqrestore(&cm.lock, flags);
1997 return NULL;
1998 }
1999 cm_id_priv = idr_find(&cm.local_id_table,
97f52eb4 2000 (__force int) timewait_info->work.local_id);
a977049d
HR		 2001 if (cm_id_priv) {
2002 if (cm_id_priv->id.remote_id == remote_id)
2003 atomic_inc(&cm_id_priv->refcount);
2004 else
2005 cm_id_priv = NULL;
2006 }
2007 spin_unlock_irqrestore(&cm.lock, flags);
2008 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2009 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2010 else
2011 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2012
2013 return cm_id_priv;
2014}
2015
2016static int cm_rej_handler(struct cm_work *work)
2017{
2018 struct cm_id_private *cm_id_priv;
2019 struct cm_rej_msg *rej_msg;
2020 unsigned long flags;
2021 int ret;
2022
2023 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2024 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2025 if (!cm_id_priv)
2026 return -EINVAL;
2027
2028 cm_format_rej_event(work);
2029
2030 spin_lock_irqsave(&cm_id_priv->lock, flags);
2031 switch (cm_id_priv->id.state) {
2032 case IB_CM_REQ_SENT:
2033 case IB_CM_MRA_REQ_RCVD:
2034 case IB_CM_REP_SENT:
2035 case IB_CM_MRA_REP_RCVD:
2036 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2037 (unsigned long) cm_id_priv->msg);
2038 /* fall through */
2039 case IB_CM_REQ_RCVD:
2040 case IB_CM_MRA_REQ_SENT:
97f52eb4 2041 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
a977049d
HR		 2042 cm_enter_timewait(cm_id_priv);
2043 else
2044 cm_reset_to_idle(cm_id_priv);
2045 break;
2046 case IB_CM_DREQ_SENT:
2047 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2048 (unsigned long) cm_id_priv->msg);
2049 /* fall through */
2050 case IB_CM_REP_RCVD:
2051 case IB_CM_MRA_REP_SENT:
2052 case IB_CM_ESTABLISHED:
2053 cm_enter_timewait(cm_id_priv);
2054 break;
2055 default:
2056 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2057 ret = -EINVAL;
2058 goto out;
2059 }
2060
2061 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2062 if (!ret)
2063 list_add_tail(&work->list, &cm_id_priv->work_list);
2064 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2065
2066 if (ret)
2067 cm_process_work(cm_id_priv, work);
2068 else
2069 cm_deref_id(cm_id_priv);
2070 return 0;
2071out:
2072 cm_deref_id(cm_id_priv);
2073 return -EINVAL;
2074}
2075
2076int ib_send_cm_mra(struct ib_cm_id *cm_id,
2077 u8 service_timeout,
2078 const void *private_data,
2079 u8 private_data_len)
2080{
2081 struct cm_id_private *cm_id_priv;
2082 struct ib_mad_send_buf *msg;
2083 struct ib_send_wr *bad_send_wr;
2084 void *data;
2085 unsigned long flags;
2086 int ret;
2087
2088 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2089 return -EINVAL;
2090
2091 data = cm_copy_private_data(private_data, private_data_len);
2092 if (IS_ERR(data))
2093 return PTR_ERR(data);
2094
2095 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2096
2097 spin_lock_irqsave(&cm_id_priv->lock, flags);
2098 switch(cm_id_priv->id.state) {
2099 case IB_CM_REQ_RCVD:
2100 ret = cm_alloc_msg(cm_id_priv, &msg);
2101 if (ret)
2102 goto error1;
2103
2104 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2105 CM_MSG_RESPONSE_REQ, service_timeout,
2106 private_data, private_data_len);
2107 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2108 &msg->send_wr, &bad_send_wr);
2109 if (ret)
2110 goto error2;
2111 cm_id->state = IB_CM_MRA_REQ_SENT;
2112 break;
2113 case IB_CM_REP_RCVD:
2114 ret = cm_alloc_msg(cm_id_priv, &msg);
2115 if (ret)
2116 goto error1;
2117
2118 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2119 CM_MSG_RESPONSE_REP, service_timeout,
2120 private_data, private_data_len);
2121 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2122 &msg->send_wr, &bad_send_wr);
2123 if (ret)
2124 goto error2;
2125 cm_id->state = IB_CM_MRA_REP_SENT;
2126 break;
2127 case IB_CM_ESTABLISHED:
2128 ret = cm_alloc_msg(cm_id_priv, &msg);
2129 if (ret)
2130 goto error1;
2131
2132 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2133 CM_MSG_RESPONSE_OTHER, service_timeout,
2134 private_data, private_data_len);
2135 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2136 &msg->send_wr, &bad_send_wr);
2137 if (ret)
2138 goto error2;
2139 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2140 break;
2141 default:
2142 ret = -EINVAL;
2143 goto error1;
2144 }
2145 cm_id_priv->service_timeout = service_timeout;
2146 cm_set_private_data(cm_id_priv, data, private_data_len);
2147 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2148 return 0;
2149
2150error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2151 kfree(data);
2152 return ret;
2153
2154error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2155 kfree(data);
2156 cm_free_msg(msg);
2157 return ret;
2158}
2159EXPORT_SYMBOL(ib_send_cm_mra);
2160
2161static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2162{
2163 switch (cm_mra_get_msg_mraed(mra_msg)) {
2164 case CM_MSG_RESPONSE_REQ:
2165 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2166 case CM_MSG_RESPONSE_REP:
2167 case CM_MSG_RESPONSE_OTHER:
2168 return cm_acquire_id(mra_msg->remote_comm_id,
2169 mra_msg->local_comm_id);
2170 default:
2171 return NULL;
2172 }
2173}
2174
2175static int cm_mra_handler(struct cm_work *work)
2176{
2177 struct cm_id_private *cm_id_priv;
2178 struct cm_mra_msg *mra_msg;
2179 unsigned long flags;
2180 int timeout, ret;
2181
2182 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2183 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2184 if (!cm_id_priv)
2185 return -EINVAL;
2186
2187 work->cm_event.private_data = &mra_msg->private_data;
2188 work->cm_event.param.mra_rcvd.service_timeout =
2189 cm_mra_get_service_timeout(mra_msg);
2190 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2191 cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2192
2193 spin_lock_irqsave(&cm_id_priv->lock, flags);
2194 switch (cm_id_priv->id.state) {
2195 case IB_CM_REQ_SENT:
2196 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2197 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2198 (unsigned long) cm_id_priv->msg, timeout))
2199 goto out;
2200 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2201 break;
2202 case IB_CM_REP_SENT:
2203 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2204 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2205 (unsigned long) cm_id_priv->msg, timeout))
2206 goto out;
2207 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2208 break;
2209 case IB_CM_ESTABLISHED:
2210 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2211 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2212 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2213 (unsigned long) cm_id_priv->msg, timeout))
2214 goto out;
2215 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2216 break;
2217 default:
2218 goto out;
2219 }
2220
2221 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2222 cm_id_priv->id.state;
2223 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2224 if (!ret)
2225 list_add_tail(&work->list, &cm_id_priv->work_list);
2226 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2227
2228 if (ret)
2229 cm_process_work(cm_id_priv, work);
2230 else
2231 cm_deref_id(cm_id_priv);
2232 return 0;
2233out:
2234 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2235 cm_deref_id(cm_id_priv);
2236 return -EINVAL;
2237}
2238
2239static void cm_format_lap(struct cm_lap_msg *lap_msg,
2240 struct cm_id_private *cm_id_priv,
2241 struct ib_sa_path_rec *alternate_path,
2242 const void *private_data,
2243 u8 private_data_len)
2244{
2245 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2246 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2247 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2248 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2249 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2250 /* todo: need remote CM response timeout */
2251 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2252 lap_msg->alt_local_lid = alternate_path->slid;
2253 lap_msg->alt_remote_lid = alternate_path->dlid;
2254 lap_msg->alt_local_gid = alternate_path->sgid;
2255 lap_msg->alt_remote_gid = alternate_path->dgid;
2256 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2257 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2258 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2259 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2260 cm_lap_set_sl(lap_msg, alternate_path->sl);
2261 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2262 cm_lap_set_local_ack_timeout(lap_msg,
2263 min(31, alternate_path->packet_life_time + 1));
2264
2265 if (private_data && private_data_len)
2266 memcpy(lap_msg->private_data, private_data, private_data_len);
2267}
2268
2269int ib_send_cm_lap(struct ib_cm_id *cm_id,
2270 struct ib_sa_path_rec *alternate_path,
2271 const void *private_data,
2272 u8 private_data_len)
2273{
2274 struct cm_id_private *cm_id_priv;
2275 struct ib_mad_send_buf *msg;
2276 struct ib_send_wr *bad_send_wr;
2277 unsigned long flags;
2278 int ret;
2279
2280 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2281 return -EINVAL;
2282
2283 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2284 spin_lock_irqsave(&cm_id_priv->lock, flags);
2285 if (cm_id->state != IB_CM_ESTABLISHED ||
2286 cm_id->lap_state != IB_CM_LAP_IDLE) {
2287 ret = -EINVAL;
2288 goto out;
2289 }
2290
2291 ret = cm_alloc_msg(cm_id_priv, &msg);
2292 if (ret)
2293 goto out;
2294
2295 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2296 alternate_path, private_data, private_data_len);
2297 msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
2298 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2299
2300 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2301 &msg->send_wr, &bad_send_wr);
2302 if (ret) {
2303 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2304 cm_free_msg(msg);
2305 return ret;
2306 }
2307
2308 cm_id->lap_state = IB_CM_LAP_SENT;
2309 cm_id_priv->msg = msg;
2310
2311out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2312 return ret;
2313}
2314EXPORT_SYMBOL(ib_send_cm_lap);
2315
2316static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2317 struct cm_lap_msg *lap_msg)
2318{
2319 memset(path, 0, sizeof *path);
2320 path->dgid = lap_msg->alt_local_gid;
2321 path->sgid = lap_msg->alt_remote_gid;
2322 path->dlid = lap_msg->alt_local_lid;
2323 path->slid = lap_msg->alt_remote_lid;
2324 path->flow_label = cm_lap_get_flow_label(lap_msg);
2325 path->hop_limit = lap_msg->alt_hop_limit;
2326 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2327 path->reversible = 1;
2328 /* pkey is same as in REQ */
2329 path->sl = cm_lap_get_sl(lap_msg);
2330 path->mtu_selector = IB_SA_EQ;
2331 /* mtu is same as in REQ */
2332 path->rate_selector = IB_SA_EQ;
2333 path->rate = cm_lap_get_packet_rate(lap_msg);
2334 path->packet_life_time_selector = IB_SA_EQ;
2335 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2336 path->packet_life_time -= (path->packet_life_time > 0);
2337}
2338
2339static int cm_lap_handler(struct cm_work *work)
2340{
2341 struct cm_id_private *cm_id_priv;
2342 struct cm_lap_msg *lap_msg;
2343 struct ib_cm_lap_event_param *param;
2344 struct ib_mad_send_buf *msg = NULL;
2345 struct ib_send_wr *bad_send_wr;
2346 unsigned long flags;
2347 int ret;
2348
2349 /* todo: verify LAP request and send reject APR if invalid. */
2350 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2351 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2352 lap_msg->local_comm_id);
2353 if (!cm_id_priv)
2354 return -EINVAL;
2355
2356 param = &work->cm_event.param.lap_rcvd;
2357 param->alternate_path = &work->path[0];
2358 cm_format_path_from_lap(param->alternate_path, lap_msg);
2359 work->cm_event.private_data = &lap_msg->private_data;
2360
2361 spin_lock_irqsave(&cm_id_priv->lock, flags);
2362 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2363 goto unlock;
2364
2365 switch (cm_id_priv->id.lap_state) {
2366 case IB_CM_LAP_IDLE:
2367 break;
2368 case IB_CM_MRA_LAP_SENT:
2369 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2370 goto unlock;
2371
2372 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2373 CM_MSG_RESPONSE_OTHER,
2374 cm_id_priv->service_timeout,
2375 cm_id_priv->private_data,
2376 cm_id_priv->private_data_len);
2377 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2378
2379 if (ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2380 &msg->send_wr, &bad_send_wr))
2381 cm_free_msg(msg);
2382 goto deref;
2383 default:
2384 goto unlock;
2385 }
2386
2387 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2388 cm_id_priv->tid = lap_msg->hdr.tid;
2389 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2390 if (!ret)
2391 list_add_tail(&work->list, &cm_id_priv->work_list);
2392 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2393
2394 if (ret)
2395 cm_process_work(cm_id_priv, work);
2396 else
2397 cm_deref_id(cm_id_priv);
2398 return 0;
2399
2400unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2401deref: cm_deref_id(cm_id_priv);
2402 return -EINVAL;
2403}
2404
2405static void cm_format_apr(struct cm_apr_msg *apr_msg,
2406 struct cm_id_private *cm_id_priv,
2407 enum ib_cm_apr_status status,
2408 void *info,
2409 u8 info_length,
2410 const void *private_data,
2411 u8 private_data_len)
2412{
2413 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2414 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2415 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2416 apr_msg->ap_status = (u8) status;
2417
2418 if (info && info_length) {
2419 apr_msg->info_length = info_length;
2420 memcpy(apr_msg->info, info, info_length);
2421 }
2422
2423 if (private_data && private_data_len)
2424 memcpy(apr_msg->private_data, private_data, private_data_len);
2425}
2426
2427int ib_send_cm_apr(struct ib_cm_id *cm_id,
2428 enum ib_cm_apr_status status,
2429 void *info,
2430 u8 info_length,
2431 const void *private_data,
2432 u8 private_data_len)
2433{
2434 struct cm_id_private *cm_id_priv;
2435 struct ib_mad_send_buf *msg;
2436 struct ib_send_wr *bad_send_wr;
2437 unsigned long flags;
2438 int ret;
2439
2440 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2441 (info && info_length > IB_CM_APR_INFO_LENGTH))
2442 return -EINVAL;
2443
2444 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2445 spin_lock_irqsave(&cm_id_priv->lock, flags);
2446 if (cm_id->state != IB_CM_ESTABLISHED ||
2447 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2448 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2449 ret = -EINVAL;
2450 goto out;
2451 }
2452
2453 ret = cm_alloc_msg(cm_id_priv, &msg);
2454 if (ret)
2455 goto out;
2456
2457 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2458 info, info_length, private_data, private_data_len);
2459 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2460 &msg->send_wr, &bad_send_wr);
2461 if (ret) {
2462 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2463 cm_free_msg(msg);
2464 return ret;
2465 }
2466
2467 cm_id->lap_state = IB_CM_LAP_IDLE;
2468out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2469 return ret;
2470}
2471EXPORT_SYMBOL(ib_send_cm_apr);
2472
2473static int cm_apr_handler(struct cm_work *work)
2474{
2475 struct cm_id_private *cm_id_priv;
2476 struct cm_apr_msg *apr_msg;
2477 unsigned long flags;
2478 int ret;
2479
2480 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2481 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2482 apr_msg->local_comm_id);
2483 if (!cm_id_priv)
2484 return -EINVAL; /* Unmatched reply. */
2485
2486 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2487 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2488 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2489 work->cm_event.private_data = &apr_msg->private_data;
2490
2491 spin_lock_irqsave(&cm_id_priv->lock, flags);
2492 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2493 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2494 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2495 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2496 goto out;
2497 }
2498 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2499 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2500 (unsigned long) cm_id_priv->msg);
2501 cm_id_priv->msg = NULL;
2502
2503 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2504 if (!ret)
2505 list_add_tail(&work->list, &cm_id_priv->work_list);
2506 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2507
2508 if (ret)
2509 cm_process_work(cm_id_priv, work);
2510 else
2511 cm_deref_id(cm_id_priv);
2512 return 0;
2513out:
2514 cm_deref_id(cm_id_priv);
2515 return -EINVAL;
2516}
2517
2518static int cm_timewait_handler(struct cm_work *work)
2519{
2520 struct cm_timewait_info *timewait_info;
2521 struct cm_id_private *cm_id_priv;
2522 unsigned long flags;
2523 int ret;
2524
2525 timewait_info = (struct cm_timewait_info *)work;
2526 cm_cleanup_timewait(timewait_info);
2527
2528 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2529 timewait_info->work.remote_id);
2530 if (!cm_id_priv)
2531 return -EINVAL;
2532
2533 spin_lock_irqsave(&cm_id_priv->lock, flags);
2534 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2535 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2536 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2537 goto out;
2538 }
2539 cm_id_priv->id.state = IB_CM_IDLE;
2540 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2541 if (!ret)
2542 list_add_tail(&work->list, &cm_id_priv->work_list);
2543 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2544
2545 if (ret)
2546 cm_process_work(cm_id_priv, work);
2547 else
2548 cm_deref_id(cm_id_priv);
2549 return 0;
2550out:
2551 cm_deref_id(cm_id_priv);
2552 return -EINVAL;
2553}
2554
2555static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2556 struct cm_id_private *cm_id_priv,
2557 struct ib_cm_sidr_req_param *param)
2558{
2559 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2560 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2561 sidr_req_msg->request_id = cm_id_priv->id.local_id;
97f52eb4 2562 sidr_req_msg->pkey = cpu_to_be16(param->pkey);
a977049d
HR		 2563 sidr_req_msg->service_id = param->service_id;
2564
2565 if (param->private_data && param->private_data_len)
2566 memcpy(sidr_req_msg->private_data, param->private_data,
2567 param->private_data_len);
2568}
2569
2570int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2571 struct ib_cm_sidr_req_param *param)
2572{
2573 struct cm_id_private *cm_id_priv;
2574 struct ib_mad_send_buf *msg;
2575 struct ib_send_wr *bad_send_wr;
2576 unsigned long flags;
2577 int ret;
2578
2579 if (!param->path || (param->private_data &&
2580 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2581 return -EINVAL;
2582
2583 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2584 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2585 if (ret)
2586 goto out;
2587
2588 cm_id->service_id = param->service_id;
97f52eb4 2589 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 2590 cm_id_priv->timeout_ms = param->timeout_ms;
2591 cm_id_priv->max_cm_retries = param->max_cm_retries;
2592 ret = cm_alloc_msg(cm_id_priv, &msg);
2593 if (ret)
2594 goto out;
2595
2596 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2597 param);
2598 msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms;
2599 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2600
2601 spin_lock_irqsave(&cm_id_priv->lock, flags);
2602 if (cm_id->state == IB_CM_IDLE)
2603 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2604 &msg->send_wr, &bad_send_wr);
2605 else
2606 ret = -EINVAL;
2607
2608 if (ret) {
2609 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2610 cm_free_msg(msg);
2611 goto out;
2612 }
2613 cm_id->state = IB_CM_SIDR_REQ_SENT;
2614 cm_id_priv->msg = msg;
2615 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2616out:
2617 return ret;
2618}
2619EXPORT_SYMBOL(ib_send_cm_sidr_req);
2620
2621static void cm_format_sidr_req_event(struct cm_work *work,
2622 struct ib_cm_id *listen_id)
2623{
2624 struct cm_sidr_req_msg *sidr_req_msg;
2625 struct ib_cm_sidr_req_event_param *param;
2626
2627 sidr_req_msg = (struct cm_sidr_req_msg *)
2628 work->mad_recv_wc->recv_buf.mad;
2629 param = &work->cm_event.param.sidr_req_rcvd;
97f52eb4 2630 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
a977049d
HR		 2631 param->listen_id = listen_id;
2632 param->device = work->port->mad_agent->device;
2633 param->port = work->port->port_num;
2634 work->cm_event.private_data = &sidr_req_msg->private_data;
2635}
2636
2637static int cm_sidr_req_handler(struct cm_work *work)
2638{
2639 struct ib_cm_id *cm_id;
2640 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2641 struct cm_sidr_req_msg *sidr_req_msg;
2642 struct ib_wc *wc;
2643 unsigned long flags;
2644
2645 cm_id = ib_create_cm_id(NULL, NULL);
2646 if (IS_ERR(cm_id))
2647 return PTR_ERR(cm_id);
2648 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2649
2650 /* Record SGID/SLID and request ID for lookup. */
2651 sidr_req_msg = (struct cm_sidr_req_msg *)
2652 work->mad_recv_wc->recv_buf.mad;
2653 wc = work->mad_recv_wc->wc;
97f52eb4 2654 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
a977049d
HR		 2655 cm_id_priv->av.dgid.global.interface_id = 0;
2656 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2657 &cm_id_priv->av);
2658 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2659 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2660 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2661 atomic_inc(&cm_id_priv->work_count);
2662
2663 spin_lock_irqsave(&cm.lock, flags);
2664 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2665 if (cur_cm_id_priv) {
2666 spin_unlock_irqrestore(&cm.lock, flags);
2667 goto out; /* Duplicate message. */
2668 }
2669 cur_cm_id_priv = cm_find_listen(sidr_req_msg->service_id);
2670 if (!cur_cm_id_priv) {
2671 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2672 spin_unlock_irqrestore(&cm.lock, flags);
2673 /* todo: reply with no match */
2674 goto out; /* No match. */
2675 }
2676 atomic_inc(&cur_cm_id_priv->refcount);
2677 spin_unlock_irqrestore(&cm.lock, flags);
2678
2679 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2680 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2681 cm_id_priv->id.service_id = sidr_req_msg->service_id;
97f52eb4 2682 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 2683
2684 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2685 cm_process_work(cm_id_priv, work);
2686 cm_deref_id(cur_cm_id_priv);
2687 return 0;
2688out:
2689 ib_destroy_cm_id(&cm_id_priv->id);
2690 return -EINVAL;
2691}
2692
2693static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2694 struct cm_id_private *cm_id_priv,
2695 struct ib_cm_sidr_rep_param *param)
2696{
2697 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2698 cm_id_priv->tid);
2699 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2700 sidr_rep_msg->status = param->status;
2701 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2702 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2703 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2704
2705 if (param->info && param->info_length)
2706 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2707
2708 if (param->private_data && param->private_data_len)
2709 memcpy(sidr_rep_msg->private_data, param->private_data,
2710 param->private_data_len);
2711}
2712
2713int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2714 struct ib_cm_sidr_rep_param *param)
2715{
2716 struct cm_id_private *cm_id_priv;
2717 struct ib_mad_send_buf *msg;
2718 struct ib_send_wr *bad_send_wr;
2719 unsigned long flags;
2720 int ret;
2721
2722 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2723 (param->private_data &&
2724 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2725 return -EINVAL;
2726
2727 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2728 spin_lock_irqsave(&cm_id_priv->lock, flags);
2729 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2730 ret = -EINVAL;
2731 goto error;
2732 }
2733
2734 ret = cm_alloc_msg(cm_id_priv, &msg);
2735 if (ret)
2736 goto error;
2737
2738 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2739 param);
2740 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent,
2741 &msg->send_wr, &bad_send_wr);
2742 if (ret) {
2743 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2744 cm_free_msg(msg);
2745 return ret;
2746 }
2747 cm_id->state = IB_CM_IDLE;
2748 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2749
2750 spin_lock_irqsave(&cm.lock, flags);
2751 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2752 spin_unlock_irqrestore(&cm.lock, flags);
2753 return 0;
2754
2755error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2756 return ret;
2757}
2758EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2759
2760static void cm_format_sidr_rep_event(struct cm_work *work)
2761{
2762 struct cm_sidr_rep_msg *sidr_rep_msg;
2763 struct ib_cm_sidr_rep_event_param *param;
2764
2765 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2766 work->mad_recv_wc->recv_buf.mad;
2767 param = &work->cm_event.param.sidr_rep_rcvd;
2768 param->status = sidr_rep_msg->status;
2769 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2770 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2771 param->info = &sidr_rep_msg->info;
2772 param->info_len = sidr_rep_msg->info_length;
2773 work->cm_event.private_data = &sidr_rep_msg->private_data;
2774}
2775
2776static int cm_sidr_rep_handler(struct cm_work *work)
2777{
2778 struct cm_sidr_rep_msg *sidr_rep_msg;
2779 struct cm_id_private *cm_id_priv;
2780 unsigned long flags;
2781
2782 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2783 work->mad_recv_wc->recv_buf.mad;
2784 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2785 if (!cm_id_priv)
2786 return -EINVAL; /* Unmatched reply. */
2787
2788 spin_lock_irqsave(&cm_id_priv->lock, flags);
2789 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2790 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2791 goto out;
2792 }
2793 cm_id_priv->id.state = IB_CM_IDLE;
2794 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2795 (unsigned long) cm_id_priv->msg);
2796 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2797
2798 cm_format_sidr_rep_event(work);
2799 cm_process_work(cm_id_priv, work);
2800 return 0;
2801out:
2802 cm_deref_id(cm_id_priv);
2803 return -EINVAL;
2804}
2805
2806static void cm_process_send_error(struct ib_mad_send_buf *msg,
2807 enum ib_wc_status wc_status)
2808{
2809 struct cm_id_private *cm_id_priv;
2810 struct ib_cm_event cm_event;
2811 enum ib_cm_state state;
2812 unsigned long flags;
2813 int ret;
2814
2815 memset(&cm_event, 0, sizeof cm_event);
2816 cm_id_priv = msg->context[0];
2817
2818 /* Discard old sends or ones without a response. */
2819 spin_lock_irqsave(&cm_id_priv->lock, flags);
2820 state = (enum ib_cm_state) (unsigned long) msg->context[1];
2821 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2822 goto discard;
2823
2824 switch (state) {
2825 case IB_CM_REQ_SENT:
2826 case IB_CM_MRA_REQ_RCVD:
2827 cm_reset_to_idle(cm_id_priv);
2828 cm_event.event = IB_CM_REQ_ERROR;
2829 break;
2830 case IB_CM_REP_SENT:
2831 case IB_CM_MRA_REP_RCVD:
2832 cm_reset_to_idle(cm_id_priv);
2833 cm_event.event = IB_CM_REP_ERROR;
2834 break;
2835 case IB_CM_DREQ_SENT:
2836 cm_enter_timewait(cm_id_priv);
2837 cm_event.event = IB_CM_DREQ_ERROR;
2838 break;
2839 case IB_CM_SIDR_REQ_SENT:
2840 cm_id_priv->id.state = IB_CM_IDLE;
2841 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2842 break;
2843 default:
2844 goto discard;
2845 }
2846 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2847 cm_event.param.send_status = wc_status;
2848
2849 /* No other events can occur on the cm_id at this point. */
2850 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2851 cm_free_msg(msg);
2852 if (ret)
2853 ib_destroy_cm_id(&cm_id_priv->id);
2854 return;
2855discard:
2856 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2857 cm_free_msg(msg);
2858}
2859
2860static void cm_send_handler(struct ib_mad_agent *mad_agent,
2861 struct ib_mad_send_wc *mad_send_wc)
2862{
2863 struct ib_mad_send_buf *msg;
2864
2865 msg = (struct ib_mad_send_buf *)(unsigned long)mad_send_wc->wr_id;
2866
2867 switch (mad_send_wc->status) {
2868 case IB_WC_SUCCESS:
2869 case IB_WC_WR_FLUSH_ERR:
2870 cm_free_msg(msg);
2871 break;
2872 default:
2873 if (msg->context[0] && msg->context[1])
2874 cm_process_send_error(msg, mad_send_wc->status);
2875 else
2876 cm_free_msg(msg);
2877 break;
2878 }
2879}
2880
2881static void cm_work_handler(void *data)
2882{
2883 struct cm_work *work = data;
2884 int ret;
2885
2886 switch (work->cm_event.event) {
2887 case IB_CM_REQ_RECEIVED:
2888 ret = cm_req_handler(work);
2889 break;
2890 case IB_CM_MRA_RECEIVED:
2891 ret = cm_mra_handler(work);
2892 break;
2893 case IB_CM_REJ_RECEIVED:
2894 ret = cm_rej_handler(work);
2895 break;
2896 case IB_CM_REP_RECEIVED:
2897 ret = cm_rep_handler(work);
2898 break;
2899 case IB_CM_RTU_RECEIVED:
2900 ret = cm_rtu_handler(work);
2901 break;
2902 case IB_CM_USER_ESTABLISHED:
2903 ret = cm_establish_handler(work);
2904 break;
2905 case IB_CM_DREQ_RECEIVED:
2906 ret = cm_dreq_handler(work);
2907 break;
2908 case IB_CM_DREP_RECEIVED:
2909 ret = cm_drep_handler(work);
2910 break;
2911 case IB_CM_SIDR_REQ_RECEIVED:
2912 ret = cm_sidr_req_handler(work);
2913 break;
2914 case IB_CM_SIDR_REP_RECEIVED:
2915 ret = cm_sidr_rep_handler(work);
2916 break;
2917 case IB_CM_LAP_RECEIVED:
2918 ret = cm_lap_handler(work);
2919 break;
2920 case IB_CM_APR_RECEIVED:
2921 ret = cm_apr_handler(work);
2922 break;
2923 case IB_CM_TIMEWAIT_EXIT:
2924 ret = cm_timewait_handler(work);
2925 break;
2926 default:
2927 ret = -EINVAL;
2928 break;
2929 }
2930 if (ret)
2931 cm_free_work(work);
2932}
2933
2934int ib_cm_establish(struct ib_cm_id *cm_id)
2935{
2936 struct cm_id_private *cm_id_priv;
2937 struct cm_work *work;
2938 unsigned long flags;
2939 int ret = 0;
2940
2941 work = kmalloc(sizeof *work, GFP_ATOMIC);
2942 if (!work)
2943 return -ENOMEM;
2944
2945 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2946 spin_lock_irqsave(&cm_id_priv->lock, flags);
2947 switch (cm_id->state)
2948 {
2949 case IB_CM_REP_SENT:
2950 case IB_CM_MRA_REP_RCVD:
2951 cm_id->state = IB_CM_ESTABLISHED;
2952 break;
2953 case IB_CM_ESTABLISHED:
2954 ret = -EISCONN;
2955 break;
2956 default:
2957 ret = -EINVAL;
2958 break;
2959 }
2960 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2961
2962 if (ret) {
2963 kfree(work);
2964 goto out;
2965 }
2966
2967 /*
2968 * The CM worker thread may try to destroy the cm_id before it
2969 * can execute this work item. To prevent potential deadlock,
2970 * we need to find the cm_id once we're in the context of the
2971 * worker thread, rather than holding a reference on it.
2972 */
2973 INIT_WORK(&work->work, cm_work_handler, work);
2974 work->local_id = cm_id->local_id;
2975 work->remote_id = cm_id->remote_id;
2976 work->mad_recv_wc = NULL;
2977 work->cm_event.event = IB_CM_USER_ESTABLISHED;
2978 queue_work(cm.wq, &work->work);
2979out:
2980 return ret;
2981}
2982EXPORT_SYMBOL(ib_cm_establish);
2983
2984static void cm_recv_handler(struct ib_mad_agent *mad_agent,
2985 struct ib_mad_recv_wc *mad_recv_wc)
2986{
2987 struct cm_work *work;
2988 enum ib_cm_event_type event;
2989 int paths = 0;
2990
2991 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
2992 case CM_REQ_ATTR_ID:
2993 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
2994 alt_local_lid != 0);
2995 event = IB_CM_REQ_RECEIVED;
2996 break;
2997 case CM_MRA_ATTR_ID:
2998 event = IB_CM_MRA_RECEIVED;
2999 break;
3000 case CM_REJ_ATTR_ID:
3001 event = IB_CM_REJ_RECEIVED;
3002 break;
3003 case CM_REP_ATTR_ID:
3004 event = IB_CM_REP_RECEIVED;
3005 break;
3006 case CM_RTU_ATTR_ID:
3007 event = IB_CM_RTU_RECEIVED;
3008 break;
3009 case CM_DREQ_ATTR_ID:
3010 event = IB_CM_DREQ_RECEIVED;
3011 break;
3012 case CM_DREP_ATTR_ID:
3013 event = IB_CM_DREP_RECEIVED;
3014 break;
3015 case CM_SIDR_REQ_ATTR_ID:
3016 event = IB_CM_SIDR_REQ_RECEIVED;
3017 break;
3018 case CM_SIDR_REP_ATTR_ID:
3019 event = IB_CM_SIDR_REP_RECEIVED;
3020 break;
3021 case CM_LAP_ATTR_ID:
3022 paths = 1;
3023 event = IB_CM_LAP_RECEIVED;
3024 break;
3025 case CM_APR_ATTR_ID:
3026 event = IB_CM_APR_RECEIVED;
3027 break;
3028 default:
3029 ib_free_recv_mad(mad_recv_wc);
3030 return;
3031 }
3032
3033 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3034 GFP_KERNEL);
3035 if (!work) {
3036 ib_free_recv_mad(mad_recv_wc);
3037 return;
3038 }
3039
3040 INIT_WORK(&work->work, cm_work_handler, work);
3041 work->cm_event.event = event;
3042 work->mad_recv_wc = mad_recv_wc;
3043 work->port = (struct cm_port *)mad_agent->context;
3044 queue_work(cm.wq, &work->work);
3045}
3046
3047static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3048 struct ib_qp_attr *qp_attr,
3049 int *qp_attr_mask)
3050{
3051 unsigned long flags;
3052 int ret;
3053
3054 spin_lock_irqsave(&cm_id_priv->lock, flags);
3055 switch (cm_id_priv->id.state) {
3056 case IB_CM_REQ_SENT:
3057 case IB_CM_MRA_REQ_RCVD:
3058 case IB_CM_REQ_RCVD:
3059 case IB_CM_MRA_REQ_SENT:
3060 case IB_CM_REP_RCVD:
3061 case IB_CM_MRA_REP_SENT:
3062 case IB_CM_REP_SENT:
3063 case IB_CM_MRA_REP_RCVD:
3064 case IB_CM_ESTABLISHED:
3065 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3066 IB_QP_PKEY_INDEX | IB_QP_PORT;
3067 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE;
3068 if (cm_id_priv->responder_resources)
3069 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_WRITE |
3070 IB_ACCESS_REMOTE_READ;
3071 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3072 qp_attr->port_num = cm_id_priv->av.port->port_num;
3073 ret = 0;
3074 break;
3075 default:
3076 ret = -EINVAL;
3077 break;
3078 }
3079 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3080 return ret;
3081}
3082
3083static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3084 struct ib_qp_attr *qp_attr,
3085 int *qp_attr_mask)
3086{
3087 unsigned long flags;
3088 int ret;
3089
3090 spin_lock_irqsave(&cm_id_priv->lock, flags);
3091 switch (cm_id_priv->id.state) {
3092 case IB_CM_REQ_RCVD:
3093 case IB_CM_MRA_REQ_SENT:
3094 case IB_CM_REP_RCVD:
3095 case IB_CM_MRA_REP_SENT:
3096 case IB_CM_REP_SENT:
3097 case IB_CM_MRA_REP_RCVD:
3098 case IB_CM_ESTABLISHED:
3099 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3100 IB_QP_DEST_QPN | IB_QP_RQ_PSN |
3101 IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
3102 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3103 qp_attr->path_mtu = cm_id_priv->path_mtu;
3104 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3105 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3106 qp_attr->max_dest_rd_atomic = cm_id_priv->responder_resources;
3107 qp_attr->min_rnr_timer = 0;
3108 if (cm_id_priv->alt_av.ah_attr.dlid) {
3109 *qp_attr_mask |= IB_QP_ALT_PATH;
3110 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3111 }
3112 ret = 0;
3113 break;
3114 default:
3115 ret = -EINVAL;
3116 break;
3117 }
3118 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3119 return ret;
3120}
3121
3122static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3123 struct ib_qp_attr *qp_attr,
3124 int *qp_attr_mask)
3125{
3126 unsigned long flags;
3127 int ret;
3128
3129 spin_lock_irqsave(&cm_id_priv->lock, flags);
3130 switch (cm_id_priv->id.state) {
3131 case IB_CM_REP_RCVD:
3132 case IB_CM_MRA_REP_SENT:
3133 case IB_CM_REP_SENT:
3134 case IB_CM_MRA_REP_RCVD:
3135 case IB_CM_ESTABLISHED:
3136 *qp_attr_mask = IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3137 IB_QP_RNR_RETRY | IB_QP_SQ_PSN |
3138 IB_QP_MAX_QP_RD_ATOMIC;
3139 qp_attr->timeout = cm_id_priv->local_ack_timeout;
3140 qp_attr->retry_cnt = cm_id_priv->retry_count;
3141 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3142 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3143 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3144 if (cm_id_priv->alt_av.ah_attr.dlid) {
3145 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3146 qp_attr->path_mig_state = IB_MIG_REARM;
3147 }
3148 ret = 0;
3149 break;
3150 default:
3151 ret = -EINVAL;
3152 break;
3153 }
3154 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3155 return ret;
3156}
3157
3158int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3159 struct ib_qp_attr *qp_attr,
3160 int *qp_attr_mask)
3161{
3162 struct cm_id_private *cm_id_priv;
3163 int ret;
3164
3165 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3166 switch (qp_attr->qp_state) {
3167 case IB_QPS_INIT:
3168 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3169 break;
3170 case IB_QPS_RTR:
3171 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3172 break;
3173 case IB_QPS_RTS:
3174 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3175 break;
3176 default:
3177 ret = -EINVAL;
3178 break;
3179 }
3180 return ret;
3181}
3182EXPORT_SYMBOL(ib_cm_init_qp_attr);
3183
97f52eb4 3184static __be64 cm_get_ca_guid(struct ib_device *device)
a977049d
HR		 3185{
3186 struct ib_device_attr *device_attr;
97f52eb4 3187 __be64 guid;
a977049d
HR		 3188 int ret;
3189
3190 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
3191 if (!device_attr)
3192 return 0;
3193
3194 ret = ib_query_device(device, device_attr);
3195 guid = ret ? 0 : device_attr->node_guid;
3196 kfree(device_attr);
3197 return guid;
3198}
3199
3200static void cm_add_one(struct ib_device *device)
3201{
3202 struct cm_device *cm_dev;
3203 struct cm_port *port;
3204 struct ib_mad_reg_req reg_req = {
3205 .mgmt_class = IB_MGMT_CLASS_CM,
3206 .mgmt_class_version = IB_CM_CLASS_VERSION
3207 };
3208 struct ib_port_modify port_modify = {
3209 .set_port_cap_mask = IB_PORT_CM_SUP
3210 };
3211 unsigned long flags;
3212 int ret;
3213 u8 i;
3214
3215 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3216 device->phys_port_cnt, GFP_KERNEL);
3217 if (!cm_dev)
3218 return;
3219
3220 cm_dev->device = device;
3221 cm_dev->ca_guid = cm_get_ca_guid(device);
3222 if (!cm_dev->ca_guid)
3223 goto error1;
3224
3225 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3226 for (i = 1; i <= device->phys_port_cnt; i++) {
3227 port = &cm_dev->port[i-1];
3228 port->cm_dev = cm_dev;
3229 port->port_num = i;
3230 port->mad_agent = ib_register_mad_agent(device, i,
3231 IB_QPT_GSI,
3232 &reg_req,
3233 0,
3234 cm_send_handler,
3235 cm_recv_handler,
3236 port);
3237 if (IS_ERR(port->mad_agent))
3238 goto error2;
3239
3240 ret = ib_modify_port(device, i, 0, &port_modify);
3241 if (ret)
3242 goto error3;
3243 }
3244 ib_set_client_data(device, &cm_client, cm_dev);
3245
3246 write_lock_irqsave(&cm.device_lock, flags);
3247 list_add_tail(&cm_dev->list, &cm.device_list);
3248 write_unlock_irqrestore(&cm.device_lock, flags);
3249 return;
3250
3251error3:
3252 ib_unregister_mad_agent(port->mad_agent);
3253error2:
3254 port_modify.set_port_cap_mask = 0;
3255 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3256 while (--i) {
3257 port = &cm_dev->port[i-1];
3258 ib_modify_port(device, port->port_num, 0, &port_modify);
3259 ib_unregister_mad_agent(port->mad_agent);
3260 }
3261error1:
3262 kfree(cm_dev);
3263}
3264
3265static void cm_remove_one(struct ib_device *device)
3266{
3267 struct cm_device *cm_dev;
3268 struct cm_port *port;
3269 struct ib_port_modify port_modify = {
3270 .clr_port_cap_mask = IB_PORT_CM_SUP
3271 };
3272 unsigned long flags;
3273 int i;
3274
3275 cm_dev = ib_get_client_data(device, &cm_client);
3276 if (!cm_dev)
3277 return;
3278
3279 write_lock_irqsave(&cm.device_lock, flags);
3280 list_del(&cm_dev->list);
3281 write_unlock_irqrestore(&cm.device_lock, flags);
3282
3283 for (i = 1; i <= device->phys_port_cnt; i++) {
3284 port = &cm_dev->port[i-1];
3285 ib_modify_port(device, port->port_num, 0, &port_modify);
3286 ib_unregister_mad_agent(port->mad_agent);
3287 }
3288 kfree(cm_dev);
3289}
3290
3291static int __init ib_cm_init(void)
3292{
3293 int ret;
3294
3295 memset(&cm, 0, sizeof cm);
3296 INIT_LIST_HEAD(&cm.device_list);
3297 rwlock_init(&cm.device_lock);
3298 spin_lock_init(&cm.lock);
3299 cm.listen_service_table = RB_ROOT;
3300 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3301 cm.remote_id_table = RB_ROOT;
3302 cm.remote_qp_table = RB_ROOT;
3303 cm.remote_sidr_table = RB_ROOT;
3304 idr_init(&cm.local_id_table);
3305 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3306
3307 cm.wq = create_workqueue("ib_cm");
3308 if (!cm.wq)
3309 return -ENOMEM;
3310
3311 ret = ib_register_client(&cm_client);
3312 if (ret)
3313 goto error;
3314
3315 return 0;
3316error:
3317 destroy_workqueue(cm.wq);
3318 return ret;
3319}
3320
3321static void __exit ib_cm_cleanup(void)
3322{
3323 flush_workqueue(cm.wq);
3324 destroy_workqueue(cm.wq);
3325 ib_unregister_client(&cm_client);
3326}
3327
3328module_init(ib_cm_init);
3329module_exit(ib_cm_cleanup);
3330
Linux 6.x block layer and io_uring tree(s)