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