projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
IB: Whitespace fixes
[deliverable/linux.git] / drivers / infiniband / core / cm.c
1 /*
2 * Copyright (c) 2004-2006 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 4311 2005-12-05 18:42:01Z sean.hefty $
36 */
37
38 #include <linux/completion.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/pci.h>
44 #include <linux/random.h>
45 #include <linux/rbtree.h>
46 #include <linux/spinlock.h>
47 #include <linux/workqueue.h>
48
49 #include <rdma/ib_cache.h>
50 #include <rdma/ib_cm.h>
51 #include "cm_msgs.h"
52
53 MODULE_AUTHOR("Sean Hefty");
54 MODULE_DESCRIPTION("InfiniBand CM");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 static void cm_add_one(struct ib_device *device);
58 static void cm_remove_one(struct ib_device *device);
59
60 static struct ib_client cm_client = {
61 .name = "cm",
62 .add = cm_add_one,
63 .remove = cm_remove_one
64 };
65
66 static struct ib_cm {
67 spinlock_t lock;
68 struct list_head device_list;
69 rwlock_t device_lock;
70 struct rb_root listen_service_table;
71 u64 listen_service_id;
72 /* struct rb_root peer_service_table; todo: fix peer to peer */
73 struct rb_root remote_qp_table;
74 struct rb_root remote_id_table;
75 struct rb_root remote_sidr_table;
76 struct idr local_id_table;
77 __be32 random_id_operand;
78 struct workqueue_struct *wq;
79 } cm;
80
81 struct cm_port {
82 struct cm_device *cm_dev;
83 struct ib_mad_agent *mad_agent;
84 u8 port_num;
85 };
86
87 struct cm_device {
88 struct list_head list;
89 struct ib_device *device;
90 __be64 ca_guid;
91 struct cm_port port[0];
92 };
93
94 struct cm_av {
95 struct cm_port *port;
96 union ib_gid dgid;
97 struct ib_ah_attr ah_attr;
98 u16 pkey_index;
99 u8 packet_life_time;
100 };
101
102 struct cm_work {
103 struct work_struct work;
104 struct list_head list;
105 struct cm_port *port;
106 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
107 __be32 local_id; /* Established / timewait */
108 __be32 remote_id;
109 struct ib_cm_event cm_event;
110 struct ib_sa_path_rec path[0];
111 };
112
113 struct cm_timewait_info {
114 struct cm_work work; /* Must be first. */
115 struct rb_node remote_qp_node;
116 struct rb_node remote_id_node;
117 __be64 remote_ca_guid;
118 __be32 remote_qpn;
119 u8 inserted_remote_qp;
120 u8 inserted_remote_id;
121 };
122
123 struct cm_id_private {
124 struct ib_cm_id id;
125
126 struct rb_node service_node;
127 struct rb_node sidr_id_node;
128 spinlock_t lock; /* Do not acquire inside cm.lock */
129 struct completion comp;
130 atomic_t refcount;
131
132 struct ib_mad_send_buf *msg;
133 struct cm_timewait_info *timewait_info;
134 /* todo: use alternate port on send failure */
135 struct cm_av av;
136 struct cm_av alt_av;
137 struct ib_cm_compare_data *compare_data;
138
139 void *private_data;
140 __be64 tid;
141 __be32 local_qpn;
142 __be32 remote_qpn;
143 enum ib_qp_type qp_type;
144 __be32 sq_psn;
145 __be32 rq_psn;
146 int timeout_ms;
147 enum ib_mtu path_mtu;
148 u8 private_data_len;
149 u8 max_cm_retries;
150 u8 peer_to_peer;
151 u8 responder_resources;
152 u8 initiator_depth;
153 u8 local_ack_timeout;
154 u8 retry_count;
155 u8 rnr_retry_count;
156 u8 service_timeout;
157
158 struct list_head work_list;
159 atomic_t work_count;
160 };
161
162 static void cm_work_handler(void *data);
163
164 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
165 {
166 if (atomic_dec_and_test(&cm_id_priv->refcount))
167 complete(&cm_id_priv->comp);
168 }
169
170 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
171 struct ib_mad_send_buf **msg)
172 {
173 struct ib_mad_agent *mad_agent;
174 struct ib_mad_send_buf *m;
175 struct ib_ah *ah;
176
177 mad_agent = cm_id_priv->av.port->mad_agent;
178 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
179 if (IS_ERR(ah))
180 return PTR_ERR(ah);
181
182 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
183 cm_id_priv->av.pkey_index,
184 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
185 GFP_ATOMIC);
186 if (IS_ERR(m)) {
187 ib_destroy_ah(ah);
188 return PTR_ERR(m);
189 }
190
191 /* Timeout set by caller if response is expected. */
192 m->ah = ah;
193 m->retries = cm_id_priv->max_cm_retries;
194
195 atomic_inc(&cm_id_priv->refcount);
196 m->context[0] = cm_id_priv;
197 *msg = m;
198 return 0;
199 }
200
201 static int cm_alloc_response_msg(struct cm_port *port,
202 struct ib_mad_recv_wc *mad_recv_wc,
203 struct ib_mad_send_buf **msg)
204 {
205 struct ib_mad_send_buf *m;
206 struct ib_ah *ah;
207
208 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
209 mad_recv_wc->recv_buf.grh, port->port_num);
210 if (IS_ERR(ah))
211 return PTR_ERR(ah);
212
213 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
214 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
215 GFP_ATOMIC);
216 if (IS_ERR(m)) {
217 ib_destroy_ah(ah);
218 return PTR_ERR(m);
219 }
220 m->ah = ah;
221 *msg = m;
222 return 0;
223 }
224
225 static void cm_free_msg(struct ib_mad_send_buf *msg)
226 {
227 ib_destroy_ah(msg->ah);
228 if (msg->context[0])
229 cm_deref_id(msg->context[0]);
230 ib_free_send_mad(msg);
231 }
232
233 static void * cm_copy_private_data(const void *private_data,
234 u8 private_data_len)
235 {
236 void *data;
237
238 if (!private_data || !private_data_len)
239 return NULL;
240
241 data = kmalloc(private_data_len, GFP_KERNEL);
242 if (!data)
243 return ERR_PTR(-ENOMEM);
244
245 memcpy(data, private_data, private_data_len);
246 return data;
247 }
248
249 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
250 void *private_data, u8 private_data_len)
251 {
252 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
253 kfree(cm_id_priv->private_data);
254
255 cm_id_priv->private_data = private_data;
256 cm_id_priv->private_data_len = private_data_len;
257 }
258
259 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
260 struct ib_grh *grh, struct cm_av *av)
261 {
262 av->port = port;
263 av->pkey_index = wc->pkey_index;
264 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
265 grh, &av->ah_attr);
266 }
267
268 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
269 {
270 struct cm_device *cm_dev;
271 struct cm_port *port = NULL;
272 unsigned long flags;
273 int ret;
274 u8 p;
275
276 read_lock_irqsave(&cm.device_lock, flags);
277 list_for_each_entry(cm_dev, &cm.device_list, list) {
278 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
279 &p, NULL)) {
280 port = &cm_dev->port[p-1];
281 break;
282 }
283 }
284 read_unlock_irqrestore(&cm.device_lock, flags);
285
286 if (!port)
287 return -EINVAL;
288
289 ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
290 be16_to_cpu(path->pkey), &av->pkey_index);
291 if (ret)
292 return ret;
293
294 av->port = port;
295 ib_init_ah_from_path(cm_dev->device, port->port_num, path,
296 &av->ah_attr);
297 av->packet_life_time = path->packet_life_time;
298 return 0;
299 }
300
301 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
302 {
303 unsigned long flags;
304 int ret, id;
305 static int next_id;
306
307 do {
308 spin_lock_irqsave(&cm.lock, flags);
309 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
310 next_id++, &id);
311 spin_unlock_irqrestore(&cm.lock, flags);
312 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
313
314 cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
315 return ret;
316 }
317
318 static void cm_free_id(__be32 local_id)
319 {
320 unsigned long flags;
321
322 spin_lock_irqsave(&cm.lock, flags);
323 idr_remove(&cm.local_id_table,
324 (__force int) (local_id ^ cm.random_id_operand));
325 spin_unlock_irqrestore(&cm.lock, flags);
326 }
327
328 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
329 {
330 struct cm_id_private *cm_id_priv;
331
332 cm_id_priv = idr_find(&cm.local_id_table,
333 (__force int) (local_id ^ cm.random_id_operand));
334 if (cm_id_priv) {
335 if (cm_id_priv->id.remote_id == remote_id)
336 atomic_inc(&cm_id_priv->refcount);
337 else
338 cm_id_priv = NULL;
339 }
340
341 return cm_id_priv;
342 }
343
344 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
345 {
346 struct cm_id_private *cm_id_priv;
347 unsigned long flags;
348
349 spin_lock_irqsave(&cm.lock, flags);
350 cm_id_priv = cm_get_id(local_id, remote_id);
351 spin_unlock_irqrestore(&cm.lock, flags);
352
353 return cm_id_priv;
354 }
355
356 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
357 {
358 int i;
359
360 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
361 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
362 ((unsigned long *) mask)[i];
363 }
364
365 static int cm_compare_data(struct ib_cm_compare_data *src_data,
366 struct ib_cm_compare_data *dst_data)
367 {
368 u8 src[IB_CM_COMPARE_SIZE];
369 u8 dst[IB_CM_COMPARE_SIZE];
370
371 if (!src_data || !dst_data)
372 return 0;
373
374 cm_mask_copy(src, src_data->data, dst_data->mask);
375 cm_mask_copy(dst, dst_data->data, src_data->mask);
376 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
377 }
378
379 static int cm_compare_private_data(u8 *private_data,
380 struct ib_cm_compare_data *dst_data)
381 {
382 u8 src[IB_CM_COMPARE_SIZE];
383
384 if (!dst_data)
385 return 0;
386
387 cm_mask_copy(src, private_data, dst_data->mask);
388 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
389 }
390
391 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
392 {
393 struct rb_node **link = &cm.listen_service_table.rb_node;
394 struct rb_node *parent = NULL;
395 struct cm_id_private *cur_cm_id_priv;
396 __be64 service_id = cm_id_priv->id.service_id;
397 __be64 service_mask = cm_id_priv->id.service_mask;
398 int data_cmp;
399
400 while (*link) {
401 parent = *link;
402 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
403 service_node);
404 data_cmp = cm_compare_data(cm_id_priv->compare_data,
405 cur_cm_id_priv->compare_data);
406 if ((cur_cm_id_priv->id.service_mask & service_id) ==
407 (service_mask & cur_cm_id_priv->id.service_id) &&
408 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
409 !data_cmp)
410 return cur_cm_id_priv;
411
412 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
413 link = &(*link)->rb_left;
414 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
415 link = &(*link)->rb_right;
416 else if (service_id < cur_cm_id_priv->id.service_id)
417 link = &(*link)->rb_left;
418 else if (service_id > cur_cm_id_priv->id.service_id)
419 link = &(*link)->rb_right;
420 else if (data_cmp < 0)
421 link = &(*link)->rb_left;
422 else
423 link = &(*link)->rb_right;
424 }
425 rb_link_node(&cm_id_priv->service_node, parent, link);
426 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
427 return NULL;
428 }
429
430 static struct cm_id_private * cm_find_listen(struct ib_device *device,
431 __be64 service_id,
432 u8 *private_data)
433 {
434 struct rb_node *node = cm.listen_service_table.rb_node;
435 struct cm_id_private *cm_id_priv;
436 int data_cmp;
437
438 while (node) {
439 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
440 data_cmp = cm_compare_private_data(private_data,
441 cm_id_priv->compare_data);
442 if ((cm_id_priv->id.service_mask & service_id) ==
443 cm_id_priv->id.service_id &&
444 (cm_id_priv->id.device == device) && !data_cmp)
445 return cm_id_priv;
446
447 if (device < cm_id_priv->id.device)
448 node = node->rb_left;
449 else if (device > cm_id_priv->id.device)
450 node = node->rb_right;
451 else if (service_id < cm_id_priv->id.service_id)
452 node = node->rb_left;
453 else if (service_id > cm_id_priv->id.service_id)
454 node = node->rb_right;
455 else if (data_cmp < 0)
456 node = node->rb_left;
457 else
458 node = node->rb_right;
459 }
460 return NULL;
461 }
462
463 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
464 *timewait_info)
465 {
466 struct rb_node **link = &cm.remote_id_table.rb_node;
467 struct rb_node *parent = NULL;
468 struct cm_timewait_info *cur_timewait_info;
469 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
470 __be32 remote_id = timewait_info->work.remote_id;
471
472 while (*link) {
473 parent = *link;
474 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
475 remote_id_node);
476 if (remote_id < cur_timewait_info->work.remote_id)
477 link = &(*link)->rb_left;
478 else if (remote_id > cur_timewait_info->work.remote_id)
479 link = &(*link)->rb_right;
480 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
481 link = &(*link)->rb_left;
482 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
483 link = &(*link)->rb_right;
484 else
485 return cur_timewait_info;
486 }
487 timewait_info->inserted_remote_id = 1;
488 rb_link_node(&timewait_info->remote_id_node, parent, link);
489 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
490 return NULL;
491 }
492
493 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
494 __be32 remote_id)
495 {
496 struct rb_node *node = cm.remote_id_table.rb_node;
497 struct cm_timewait_info *timewait_info;
498
499 while (node) {
500 timewait_info = rb_entry(node, struct cm_timewait_info,
501 remote_id_node);
502 if (remote_id < timewait_info->work.remote_id)
503 node = node->rb_left;
504 else if (remote_id > timewait_info->work.remote_id)
505 node = node->rb_right;
506 else if (remote_ca_guid < timewait_info->remote_ca_guid)
507 node = node->rb_left;
508 else if (remote_ca_guid > timewait_info->remote_ca_guid)
509 node = node->rb_right;
510 else
511 return timewait_info;
512 }
513 return NULL;
514 }
515
516 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
517 *timewait_info)
518 {
519 struct rb_node **link = &cm.remote_qp_table.rb_node;
520 struct rb_node *parent = NULL;
521 struct cm_timewait_info *cur_timewait_info;
522 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
523 __be32 remote_qpn = timewait_info->remote_qpn;
524
525 while (*link) {
526 parent = *link;
527 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
528 remote_qp_node);
529 if (remote_qpn < cur_timewait_info->remote_qpn)
530 link = &(*link)->rb_left;
531 else if (remote_qpn > cur_timewait_info->remote_qpn)
532 link = &(*link)->rb_right;
533 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
534 link = &(*link)->rb_left;
535 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
536 link = &(*link)->rb_right;
537 else
538 return cur_timewait_info;
539 }
540 timewait_info->inserted_remote_qp = 1;
541 rb_link_node(&timewait_info->remote_qp_node, parent, link);
542 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
543 return NULL;
544 }
545
546 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
547 *cm_id_priv)
548 {
549 struct rb_node **link = &cm.remote_sidr_table.rb_node;
550 struct rb_node *parent = NULL;
551 struct cm_id_private *cur_cm_id_priv;
552 union ib_gid *port_gid = &cm_id_priv->av.dgid;
553 __be32 remote_id = cm_id_priv->id.remote_id;
554
555 while (*link) {
556 parent = *link;
557 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
558 sidr_id_node);
559 if (remote_id < cur_cm_id_priv->id.remote_id)
560 link = &(*link)->rb_left;
561 else if (remote_id > cur_cm_id_priv->id.remote_id)
562 link = &(*link)->rb_right;
563 else {
564 int cmp;
565 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
566 sizeof *port_gid);
567 if (cmp < 0)
568 link = &(*link)->rb_left;
569 else if (cmp > 0)
570 link = &(*link)->rb_right;
571 else
572 return cur_cm_id_priv;
573 }
574 }
575 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
576 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
577 return NULL;
578 }
579
580 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
581 enum ib_cm_sidr_status status)
582 {
583 struct ib_cm_sidr_rep_param param;
584
585 memset(&param, 0, sizeof param);
586 param.status = status;
587 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
588 }
589
590 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
591 ib_cm_handler cm_handler,
592 void *context)
593 {
594 struct cm_id_private *cm_id_priv;
595 int ret;
596
597 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
598 if (!cm_id_priv)
599 return ERR_PTR(-ENOMEM);
600
601 cm_id_priv->id.state = IB_CM_IDLE;
602 cm_id_priv->id.device = device;
603 cm_id_priv->id.cm_handler = cm_handler;
604 cm_id_priv->id.context = context;
605 cm_id_priv->id.remote_cm_qpn = 1;
606 ret = cm_alloc_id(cm_id_priv);
607 if (ret)
608 goto error;
609
610 spin_lock_init(&cm_id_priv->lock);
611 init_completion(&cm_id_priv->comp);
612 INIT_LIST_HEAD(&cm_id_priv->work_list);
613 atomic_set(&cm_id_priv->work_count, -1);
614 atomic_set(&cm_id_priv->refcount, 1);
615 return &cm_id_priv->id;
616
617 error:
618 kfree(cm_id_priv);
619 return ERR_PTR(-ENOMEM);
620 }
621 EXPORT_SYMBOL(ib_create_cm_id);
622
623 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
624 {
625 struct cm_work *work;
626
627 if (list_empty(&cm_id_priv->work_list))
628 return NULL;
629
630 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
631 list_del(&work->list);
632 return work;
633 }
634
635 static void cm_free_work(struct cm_work *work)
636 {
637 if (work->mad_recv_wc)
638 ib_free_recv_mad(work->mad_recv_wc);
639 kfree(work);
640 }
641
642 static inline int cm_convert_to_ms(int iba_time)
643 {
644 /* approximate conversion to ms from 4.096us x 2^iba_time */
645 return 1 << max(iba_time - 8, 0);
646 }
647
648 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
649 {
650 unsigned long flags;
651
652 if (!timewait_info->inserted_remote_id &&
653 !timewait_info->inserted_remote_qp)
654 return;
655
656 spin_lock_irqsave(&cm.lock, flags);
657 if (timewait_info->inserted_remote_id) {
658 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
659 timewait_info->inserted_remote_id = 0;
660 }
661
662 if (timewait_info->inserted_remote_qp) {
663 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
664 timewait_info->inserted_remote_qp = 0;
665 }
666 spin_unlock_irqrestore(&cm.lock, flags);
667 }
668
669 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
670 {
671 struct cm_timewait_info *timewait_info;
672
673 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
674 if (!timewait_info)
675 return ERR_PTR(-ENOMEM);
676
677 timewait_info->work.local_id = local_id;
678 INIT_WORK(&timewait_info->work.work, cm_work_handler,
679 &timewait_info->work);
680 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
681 return timewait_info;
682 }
683
684 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
685 {
686 int wait_time;
687
688 /*
689 * The cm_id could be destroyed by the user before we exit timewait.
690 * To protect against this, we search for the cm_id after exiting
691 * timewait before notifying the user that we've exited timewait.
692 */
693 cm_id_priv->id.state = IB_CM_TIMEWAIT;
694 wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout);
695 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
696 msecs_to_jiffies(wait_time));
697 cm_id_priv->timewait_info = NULL;
698 }
699
700 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
701 {
702 cm_id_priv->id.state = IB_CM_IDLE;
703 if (cm_id_priv->timewait_info) {
704 cm_cleanup_timewait(cm_id_priv->timewait_info);
705 kfree(cm_id_priv->timewait_info);
706 cm_id_priv->timewait_info = NULL;
707 }
708 }
709
710 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
711 {
712 struct cm_id_private *cm_id_priv;
713 struct cm_work *work;
714 unsigned long flags;
715
716 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
717 retest:
718 spin_lock_irqsave(&cm_id_priv->lock, flags);
719 switch (cm_id->state) {
720 case IB_CM_LISTEN:
721 cm_id->state = IB_CM_IDLE;
722 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
723 spin_lock_irqsave(&cm.lock, flags);
724 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
725 spin_unlock_irqrestore(&cm.lock, flags);
726 break;
727 case IB_CM_SIDR_REQ_SENT:
728 cm_id->state = IB_CM_IDLE;
729 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
730 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
731 break;
732 case IB_CM_SIDR_REQ_RCVD:
733 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
734 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
735 break;
736 case IB_CM_REQ_SENT:
737 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
738 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
739 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
740 &cm_id_priv->av.port->cm_dev->ca_guid,
741 sizeof cm_id_priv->av.port->cm_dev->ca_guid,
742 NULL, 0);
743 break;
744 case IB_CM_REQ_RCVD:
745 if (err == -ENOMEM) {
746 /* Do not reject to allow future retries. */
747 cm_reset_to_idle(cm_id_priv);
748 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
749 } else {
750 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
751 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
752 NULL, 0, NULL, 0);
753 }
754 break;
755 case IB_CM_MRA_REQ_RCVD:
756 case IB_CM_REP_SENT:
757 case IB_CM_MRA_REP_RCVD:
758 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
759 /* Fall through */
760 case IB_CM_MRA_REQ_SENT:
761 case IB_CM_REP_RCVD:
762 case IB_CM_MRA_REP_SENT:
763 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
764 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
765 NULL, 0, NULL, 0);
766 break;
767 case IB_CM_ESTABLISHED:
768 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
769 ib_send_cm_dreq(cm_id, NULL, 0);
770 goto retest;
771 case IB_CM_DREQ_SENT:
772 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
773 cm_enter_timewait(cm_id_priv);
774 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
775 break;
776 case IB_CM_DREQ_RCVD:
777 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
778 ib_send_cm_drep(cm_id, NULL, 0);
779 break;
780 default:
781 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
782 break;
783 }
784
785 cm_free_id(cm_id->local_id);
786 cm_deref_id(cm_id_priv);
787 wait_for_completion(&cm_id_priv->comp);
788 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
789 cm_free_work(work);
790 kfree(cm_id_priv->compare_data);
791 kfree(cm_id_priv->private_data);
792 kfree(cm_id_priv);
793 }
794
795 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
796 {
797 cm_destroy_id(cm_id, 0);
798 }
799 EXPORT_SYMBOL(ib_destroy_cm_id);
800
801 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
802 struct ib_cm_compare_data *compare_data)
803 {
804 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
805 unsigned long flags;
806 int ret = 0;
807
808 service_mask = service_mask ? service_mask :
809 __constant_cpu_to_be64(~0ULL);
810 service_id &= service_mask;
811 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
812 (service_id != IB_CM_ASSIGN_SERVICE_ID))
813 return -EINVAL;
814
815 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
816 if (cm_id->state != IB_CM_IDLE)
817 return -EINVAL;
818
819 if (compare_data) {
820 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
821 GFP_KERNEL);
822 if (!cm_id_priv->compare_data)
823 return -ENOMEM;
824 cm_mask_copy(cm_id_priv->compare_data->data,
825 compare_data->data, compare_data->mask);
826 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
827 IB_CM_COMPARE_SIZE);
828 }
829
830 cm_id->state = IB_CM_LISTEN;
831
832 spin_lock_irqsave(&cm.lock, flags);
833 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
834 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
835 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
836 } else {
837 cm_id->service_id = service_id;
838 cm_id->service_mask = service_mask;
839 }
840 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
841 spin_unlock_irqrestore(&cm.lock, flags);
842
843 if (cur_cm_id_priv) {
844 cm_id->state = IB_CM_IDLE;
845 kfree(cm_id_priv->compare_data);
846 cm_id_priv->compare_data = NULL;
847 ret = -EBUSY;
848 }
849 return ret;
850 }
851 EXPORT_SYMBOL(ib_cm_listen);
852
853 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
854 enum cm_msg_sequence msg_seq)
855 {
856 u64 hi_tid, low_tid;
857
858 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
859 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
860 (msg_seq << 30));
861 return cpu_to_be64(hi_tid | low_tid);
862 }
863
864 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
865 __be16 attr_id, __be64 tid)
866 {
867 hdr->base_version = IB_MGMT_BASE_VERSION;
868 hdr->mgmt_class = IB_MGMT_CLASS_CM;
869 hdr->class_version = IB_CM_CLASS_VERSION;
870 hdr->method = IB_MGMT_METHOD_SEND;
871 hdr->attr_id = attr_id;
872 hdr->tid = tid;
873 }
874
875 static void cm_format_req(struct cm_req_msg *req_msg,
876 struct cm_id_private *cm_id_priv,
877 struct ib_cm_req_param *param)
878 {
879 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
880 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
881
882 req_msg->local_comm_id = cm_id_priv->id.local_id;
883 req_msg->service_id = param->service_id;
884 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
885 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
886 cm_req_set_resp_res(req_msg, param->responder_resources);
887 cm_req_set_init_depth(req_msg, param->initiator_depth);
888 cm_req_set_remote_resp_timeout(req_msg,
889 param->remote_cm_response_timeout);
890 cm_req_set_qp_type(req_msg, param->qp_type);
891 cm_req_set_flow_ctrl(req_msg, param->flow_control);
892 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
893 cm_req_set_local_resp_timeout(req_msg,
894 param->local_cm_response_timeout);
895 cm_req_set_retry_count(req_msg, param->retry_count);
896 req_msg->pkey = param->primary_path->pkey;
897 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
898 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
899 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
900 cm_req_set_srq(req_msg, param->srq);
901
902 req_msg->primary_local_lid = param->primary_path->slid;
903 req_msg->primary_remote_lid = param->primary_path->dlid;
904 req_msg->primary_local_gid = param->primary_path->sgid;
905 req_msg->primary_remote_gid = param->primary_path->dgid;
906 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
907 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
908 req_msg->primary_traffic_class = param->primary_path->traffic_class;
909 req_msg->primary_hop_limit = param->primary_path->hop_limit;
910 cm_req_set_primary_sl(req_msg, param->primary_path->sl);
911 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
912 cm_req_set_primary_local_ack_timeout(req_msg,
913 min(31, param->primary_path->packet_life_time + 1));
914
915 if (param->alternate_path) {
916 req_msg->alt_local_lid = param->alternate_path->slid;
917 req_msg->alt_remote_lid = param->alternate_path->dlid;
918 req_msg->alt_local_gid = param->alternate_path->sgid;
919 req_msg->alt_remote_gid = param->alternate_path->dgid;
920 cm_req_set_alt_flow_label(req_msg,
921 param->alternate_path->flow_label);
922 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
923 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
924 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
925 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
926 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
927 cm_req_set_alt_local_ack_timeout(req_msg,
928 min(31, param->alternate_path->packet_life_time + 1));
929 }
930
931 if (param->private_data && param->private_data_len)
932 memcpy(req_msg->private_data, param->private_data,
933 param->private_data_len);
934 }
935
936 static int cm_validate_req_param(struct ib_cm_req_param *param)
937 {
938 /* peer-to-peer not supported */
939 if (param->peer_to_peer)
940 return -EINVAL;
941
942 if (!param->primary_path)
943 return -EINVAL;
944
945 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
946 return -EINVAL;
947
948 if (param->private_data &&
949 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
950 return -EINVAL;
951
952 if (param->alternate_path &&
953 (param->alternate_path->pkey != param->primary_path->pkey ||
954 param->alternate_path->mtu != param->primary_path->mtu))
955 return -EINVAL;
956
957 return 0;
958 }
959
960 int ib_send_cm_req(struct ib_cm_id *cm_id,
961 struct ib_cm_req_param *param)
962 {
963 struct cm_id_private *cm_id_priv;
964 struct cm_req_msg *req_msg;
965 unsigned long flags;
966 int ret;
967
968 ret = cm_validate_req_param(param);
969 if (ret)
970 return ret;
971
972 /* Verify that we're not in timewait. */
973 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
974 spin_lock_irqsave(&cm_id_priv->lock, flags);
975 if (cm_id->state != IB_CM_IDLE) {
976 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
977 ret = -EINVAL;
978 goto out;
979 }
980 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
981
982 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
983 id.local_id);
984 if (IS_ERR(cm_id_priv->timewait_info)) {
985 ret = PTR_ERR(cm_id_priv->timewait_info);
986 goto out;
987 }
988
989 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
990 if (ret)
991 goto error1;
992 if (param->alternate_path) {
993 ret = cm_init_av_by_path(param->alternate_path,
994 &cm_id_priv->alt_av);
995 if (ret)
996 goto error1;
997 }
998 cm_id->service_id = param->service_id;
999 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1000 cm_id_priv->timeout_ms = cm_convert_to_ms(
1001 param->primary_path->packet_life_time) * 2 +
1002 cm_convert_to_ms(
1003 param->remote_cm_response_timeout);
1004 cm_id_priv->max_cm_retries = param->max_cm_retries;
1005 cm_id_priv->initiator_depth = param->initiator_depth;
1006 cm_id_priv->responder_resources = param->responder_resources;
1007 cm_id_priv->retry_count = param->retry_count;
1008 cm_id_priv->path_mtu = param->primary_path->mtu;
1009 cm_id_priv->qp_type = param->qp_type;
1010
1011 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1012 if (ret)
1013 goto error1;
1014
1015 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1016 cm_format_req(req_msg, cm_id_priv, param);
1017 cm_id_priv->tid = req_msg->hdr.tid;
1018 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1019 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1020
1021 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1022 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1023 cm_id_priv->local_ack_timeout =
1024 cm_req_get_primary_local_ack_timeout(req_msg);
1025
1026 spin_lock_irqsave(&cm_id_priv->lock, flags);
1027 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1028 if (ret) {
1029 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1030 goto error2;
1031 }
1032 BUG_ON(cm_id->state != IB_CM_IDLE);
1033 cm_id->state = IB_CM_REQ_SENT;
1034 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1035 return 0;
1036
1037 error2: cm_free_msg(cm_id_priv->msg);
1038 error1: kfree(cm_id_priv->timewait_info);
1039 out: return ret;
1040 }
1041 EXPORT_SYMBOL(ib_send_cm_req);
1042
1043 static int cm_issue_rej(struct cm_port *port,
1044 struct ib_mad_recv_wc *mad_recv_wc,
1045 enum ib_cm_rej_reason reason,
1046 enum cm_msg_response msg_rejected,
1047 void *ari, u8 ari_length)
1048 {
1049 struct ib_mad_send_buf *msg = NULL;
1050 struct cm_rej_msg *rej_msg, *rcv_msg;
1051 int ret;
1052
1053 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1054 if (ret)
1055 return ret;
1056
1057 /* We just need common CM header information. Cast to any message. */
1058 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1059 rej_msg = (struct cm_rej_msg *) msg->mad;
1060
1061 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1062 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1063 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1064 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1065 rej_msg->reason = cpu_to_be16(reason);
1066
1067 if (ari && ari_length) {
1068 cm_rej_set_reject_info_len(rej_msg, ari_length);
1069 memcpy(rej_msg->ari, ari, ari_length);
1070 }
1071
1072 ret = ib_post_send_mad(msg, NULL);
1073 if (ret)
1074 cm_free_msg(msg);
1075
1076 return ret;
1077 }
1078
1079 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1080 __be32 local_qpn, __be32 remote_qpn)
1081 {
1082 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1083 ((local_ca_guid == remote_ca_guid) &&
1084 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1085 }
1086
1087 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1088 struct ib_sa_path_rec *primary_path,
1089 struct ib_sa_path_rec *alt_path)
1090 {
1091 memset(primary_path, 0, sizeof *primary_path);
1092 primary_path->dgid = req_msg->primary_local_gid;
1093 primary_path->sgid = req_msg->primary_remote_gid;
1094 primary_path->dlid = req_msg->primary_local_lid;
1095 primary_path->slid = req_msg->primary_remote_lid;
1096 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1097 primary_path->hop_limit = req_msg->primary_hop_limit;
1098 primary_path->traffic_class = req_msg->primary_traffic_class;
1099 primary_path->reversible = 1;
1100 primary_path->pkey = req_msg->pkey;
1101 primary_path->sl = cm_req_get_primary_sl(req_msg);
1102 primary_path->mtu_selector = IB_SA_EQ;
1103 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1104 primary_path->rate_selector = IB_SA_EQ;
1105 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1106 primary_path->packet_life_time_selector = IB_SA_EQ;
1107 primary_path->packet_life_time =
1108 cm_req_get_primary_local_ack_timeout(req_msg);
1109 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1110
1111 if (req_msg->alt_local_lid) {
1112 memset(alt_path, 0, sizeof *alt_path);
1113 alt_path->dgid = req_msg->alt_local_gid;
1114 alt_path->sgid = req_msg->alt_remote_gid;
1115 alt_path->dlid = req_msg->alt_local_lid;
1116 alt_path->slid = req_msg->alt_remote_lid;
1117 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1118 alt_path->hop_limit = req_msg->alt_hop_limit;
1119 alt_path->traffic_class = req_msg->alt_traffic_class;
1120 alt_path->reversible = 1;
1121 alt_path->pkey = req_msg->pkey;
1122 alt_path->sl = cm_req_get_alt_sl(req_msg);
1123 alt_path->mtu_selector = IB_SA_EQ;
1124 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1125 alt_path->rate_selector = IB_SA_EQ;
1126 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1127 alt_path->packet_life_time_selector = IB_SA_EQ;
1128 alt_path->packet_life_time =
1129 cm_req_get_alt_local_ack_timeout(req_msg);
1130 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1131 }
1132 }
1133
1134 static void cm_format_req_event(struct cm_work *work,
1135 struct cm_id_private *cm_id_priv,
1136 struct ib_cm_id *listen_id)
1137 {
1138 struct cm_req_msg *req_msg;
1139 struct ib_cm_req_event_param *param;
1140
1141 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1142 param = &work->cm_event.param.req_rcvd;
1143 param->listen_id = listen_id;
1144 param->port = cm_id_priv->av.port->port_num;
1145 param->primary_path = &work->path[0];
1146 if (req_msg->alt_local_lid)
1147 param->alternate_path = &work->path[1];
1148 else
1149 param->alternate_path = NULL;
1150 param->remote_ca_guid = req_msg->local_ca_guid;
1151 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1152 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1153 param->qp_type = cm_req_get_qp_type(req_msg);
1154 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1155 param->responder_resources = cm_req_get_init_depth(req_msg);
1156 param->initiator_depth = cm_req_get_resp_res(req_msg);
1157 param->local_cm_response_timeout =
1158 cm_req_get_remote_resp_timeout(req_msg);
1159 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1160 param->remote_cm_response_timeout =
1161 cm_req_get_local_resp_timeout(req_msg);
1162 param->retry_count = cm_req_get_retry_count(req_msg);
1163 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1164 param->srq = cm_req_get_srq(req_msg);
1165 work->cm_event.private_data = &req_msg->private_data;
1166 }
1167
1168 static void cm_process_work(struct cm_id_private *cm_id_priv,
1169 struct cm_work *work)
1170 {
1171 unsigned long flags;
1172 int ret;
1173
1174 /* We will typically only have the current event to report. */
1175 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1176 cm_free_work(work);
1177
1178 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1179 spin_lock_irqsave(&cm_id_priv->lock, flags);
1180 work = cm_dequeue_work(cm_id_priv);
1181 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1182 BUG_ON(!work);
1183 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1184 &work->cm_event);
1185 cm_free_work(work);
1186 }
1187 cm_deref_id(cm_id_priv);
1188 if (ret)
1189 cm_destroy_id(&cm_id_priv->id, ret);
1190 }
1191
1192 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1193 struct cm_id_private *cm_id_priv,
1194 enum cm_msg_response msg_mraed, u8 service_timeout,
1195 const void *private_data, u8 private_data_len)
1196 {
1197 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1198 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1199 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1200 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1201 cm_mra_set_service_timeout(mra_msg, service_timeout);
1202
1203 if (private_data && private_data_len)
1204 memcpy(mra_msg->private_data, private_data, private_data_len);
1205 }
1206
1207 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1208 struct cm_id_private *cm_id_priv,
1209 enum ib_cm_rej_reason reason,
1210 void *ari,
1211 u8 ari_length,
1212 const void *private_data,
1213 u8 private_data_len)
1214 {
1215 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1216 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1217
1218 switch(cm_id_priv->id.state) {
1219 case IB_CM_REQ_RCVD:
1220 rej_msg->local_comm_id = 0;
1221 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1222 break;
1223 case IB_CM_MRA_REQ_SENT:
1224 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1225 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1226 break;
1227 case IB_CM_REP_RCVD:
1228 case IB_CM_MRA_REP_SENT:
1229 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1230 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1231 break;
1232 default:
1233 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1234 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1235 break;
1236 }
1237
1238 rej_msg->reason = cpu_to_be16(reason);
1239 if (ari && ari_length) {
1240 cm_rej_set_reject_info_len(rej_msg, ari_length);
1241 memcpy(rej_msg->ari, ari, ari_length);
1242 }
1243
1244 if (private_data && private_data_len)
1245 memcpy(rej_msg->private_data, private_data, private_data_len);
1246 }
1247
1248 static void cm_dup_req_handler(struct cm_work *work,
1249 struct cm_id_private *cm_id_priv)
1250 {
1251 struct ib_mad_send_buf *msg = NULL;
1252 unsigned long flags;
1253 int ret;
1254
1255 /* Quick state check to discard duplicate REQs. */
1256 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1257 return;
1258
1259 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1260 if (ret)
1261 return;
1262
1263 spin_lock_irqsave(&cm_id_priv->lock, flags);
1264 switch (cm_id_priv->id.state) {
1265 case IB_CM_MRA_REQ_SENT:
1266 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1267 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1268 cm_id_priv->private_data,
1269 cm_id_priv->private_data_len);
1270 break;
1271 case IB_CM_TIMEWAIT:
1272 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1273 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1274 break;
1275 default:
1276 goto unlock;
1277 }
1278 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1279
1280 ret = ib_post_send_mad(msg, NULL);
1281 if (ret)
1282 goto free;
1283 return;
1284
1285 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1286 free: cm_free_msg(msg);
1287 }
1288
1289 static struct cm_id_private * cm_match_req(struct cm_work *work,
1290 struct cm_id_private *cm_id_priv)
1291 {
1292 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1293 struct cm_timewait_info *timewait_info;
1294 struct cm_req_msg *req_msg;
1295 unsigned long flags;
1296
1297 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1298
1299 /* Check for duplicate REQ and stale connections. */
1300 spin_lock_irqsave(&cm.lock, flags);
1301 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1302 if (!timewait_info)
1303 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1304
1305 if (timewait_info) {
1306 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1307 timewait_info->work.remote_id);
1308 spin_unlock_irqrestore(&cm.lock, flags);
1309 if (cur_cm_id_priv) {
1310 cm_dup_req_handler(work, cur_cm_id_priv);
1311 cm_deref_id(cur_cm_id_priv);
1312 } else
1313 cm_issue_rej(work->port, work->mad_recv_wc,
1314 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1315 NULL, 0);
1316 goto error;
1317 }
1318
1319 /* Find matching listen request. */
1320 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1321 req_msg->service_id,
1322 req_msg->private_data);
1323 if (!listen_cm_id_priv) {
1324 spin_unlock_irqrestore(&cm.lock, flags);
1325 cm_issue_rej(work->port, work->mad_recv_wc,
1326 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1327 NULL, 0);
1328 goto error;
1329 }
1330 atomic_inc(&listen_cm_id_priv->refcount);
1331 atomic_inc(&cm_id_priv->refcount);
1332 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1333 atomic_inc(&cm_id_priv->work_count);
1334 spin_unlock_irqrestore(&cm.lock, flags);
1335 return listen_cm_id_priv;
1336
1337 error: cm_cleanup_timewait(cm_id_priv->timewait_info);
1338 return NULL;
1339 }
1340
1341 static int cm_req_handler(struct cm_work *work)
1342 {
1343 struct ib_cm_id *cm_id;
1344 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1345 struct cm_req_msg *req_msg;
1346 int ret;
1347
1348 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1349
1350 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1351 if (IS_ERR(cm_id))
1352 return PTR_ERR(cm_id);
1353
1354 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1355 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1356 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1357 work->mad_recv_wc->recv_buf.grh,
1358 &cm_id_priv->av);
1359 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1360 id.local_id);
1361 if (IS_ERR(cm_id_priv->timewait_info)) {
1362 ret = PTR_ERR(cm_id_priv->timewait_info);
1363 goto destroy;
1364 }
1365 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1366 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1367 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1368
1369 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1370 if (!listen_cm_id_priv) {
1371 ret = -EINVAL;
1372 kfree(cm_id_priv->timewait_info);
1373 goto destroy;
1374 }
1375
1376 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1377 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1378 cm_id_priv->id.service_id = req_msg->service_id;
1379 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1380
1381 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1382 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1383 if (ret) {
1384 ib_get_cached_gid(work->port->cm_dev->device,
1385 work->port->port_num, 0, &work->path[0].sgid);
1386 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1387 &work->path[0].sgid, sizeof work->path[0].sgid,
1388 NULL, 0);
1389 goto rejected;
1390 }
1391 if (req_msg->alt_local_lid) {
1392 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1393 if (ret) {
1394 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1395 &work->path[0].sgid,
1396 sizeof work->path[0].sgid, NULL, 0);
1397 goto rejected;
1398 }
1399 }
1400 cm_id_priv->tid = req_msg->hdr.tid;
1401 cm_id_priv->timeout_ms = cm_convert_to_ms(
1402 cm_req_get_local_resp_timeout(req_msg));
1403 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1404 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1405 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1406 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1407 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1408 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1409 cm_id_priv->local_ack_timeout =
1410 cm_req_get_primary_local_ack_timeout(req_msg);
1411 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1412 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1413 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1414
1415 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1416 cm_process_work(cm_id_priv, work);
1417 cm_deref_id(listen_cm_id_priv);
1418 return 0;
1419
1420 rejected:
1421 atomic_dec(&cm_id_priv->refcount);
1422 cm_deref_id(listen_cm_id_priv);
1423 destroy:
1424 ib_destroy_cm_id(cm_id);
1425 return ret;
1426 }
1427
1428 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1429 struct cm_id_private *cm_id_priv,
1430 struct ib_cm_rep_param *param)
1431 {
1432 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1433 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1434 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1435 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1436 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1437 rep_msg->resp_resources = param->responder_resources;
1438 rep_msg->initiator_depth = param->initiator_depth;
1439 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1440 cm_rep_set_failover(rep_msg, param->failover_accepted);
1441 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1442 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1443 cm_rep_set_srq(rep_msg, param->srq);
1444 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1445
1446 if (param->private_data && param->private_data_len)
1447 memcpy(rep_msg->private_data, param->private_data,
1448 param->private_data_len);
1449 }
1450
1451 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1452 struct ib_cm_rep_param *param)
1453 {
1454 struct cm_id_private *cm_id_priv;
1455 struct ib_mad_send_buf *msg;
1456 struct cm_rep_msg *rep_msg;
1457 unsigned long flags;
1458 int ret;
1459
1460 if (param->private_data &&
1461 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1462 return -EINVAL;
1463
1464 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1465 spin_lock_irqsave(&cm_id_priv->lock, flags);
1466 if (cm_id->state != IB_CM_REQ_RCVD &&
1467 cm_id->state != IB_CM_MRA_REQ_SENT) {
1468 ret = -EINVAL;
1469 goto out;
1470 }
1471
1472 ret = cm_alloc_msg(cm_id_priv, &msg);
1473 if (ret)
1474 goto out;
1475
1476 rep_msg = (struct cm_rep_msg *) msg->mad;
1477 cm_format_rep(rep_msg, cm_id_priv, param);
1478 msg->timeout_ms = cm_id_priv->timeout_ms;
1479 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1480
1481 ret = ib_post_send_mad(msg, NULL);
1482 if (ret) {
1483 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1484 cm_free_msg(msg);
1485 return ret;
1486 }
1487
1488 cm_id->state = IB_CM_REP_SENT;
1489 cm_id_priv->msg = msg;
1490 cm_id_priv->initiator_depth = param->initiator_depth;
1491 cm_id_priv->responder_resources = param->responder_resources;
1492 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1493 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1494
1495 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1496 return ret;
1497 }
1498 EXPORT_SYMBOL(ib_send_cm_rep);
1499
1500 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1501 struct cm_id_private *cm_id_priv,
1502 const void *private_data,
1503 u8 private_data_len)
1504 {
1505 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1506 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1507 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1508
1509 if (private_data && private_data_len)
1510 memcpy(rtu_msg->private_data, private_data, private_data_len);
1511 }
1512
1513 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1514 const void *private_data,
1515 u8 private_data_len)
1516 {
1517 struct cm_id_private *cm_id_priv;
1518 struct ib_mad_send_buf *msg;
1519 unsigned long flags;
1520 void *data;
1521 int ret;
1522
1523 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1524 return -EINVAL;
1525
1526 data = cm_copy_private_data(private_data, private_data_len);
1527 if (IS_ERR(data))
1528 return PTR_ERR(data);
1529
1530 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1531 spin_lock_irqsave(&cm_id_priv->lock, flags);
1532 if (cm_id->state != IB_CM_REP_RCVD &&
1533 cm_id->state != IB_CM_MRA_REP_SENT) {
1534 ret = -EINVAL;
1535 goto error;
1536 }
1537
1538 ret = cm_alloc_msg(cm_id_priv, &msg);
1539 if (ret)
1540 goto error;
1541
1542 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1543 private_data, private_data_len);
1544
1545 ret = ib_post_send_mad(msg, NULL);
1546 if (ret) {
1547 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1548 cm_free_msg(msg);
1549 kfree(data);
1550 return ret;
1551 }
1552
1553 cm_id->state = IB_CM_ESTABLISHED;
1554 cm_set_private_data(cm_id_priv, data, private_data_len);
1555 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1556 return 0;
1557
1558 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1559 kfree(data);
1560 return ret;
1561 }
1562 EXPORT_SYMBOL(ib_send_cm_rtu);
1563
1564 static void cm_format_rep_event(struct cm_work *work)
1565 {
1566 struct cm_rep_msg *rep_msg;
1567 struct ib_cm_rep_event_param *param;
1568
1569 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1570 param = &work->cm_event.param.rep_rcvd;
1571 param->remote_ca_guid = rep_msg->local_ca_guid;
1572 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1573 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1574 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1575 param->responder_resources = rep_msg->initiator_depth;
1576 param->initiator_depth = rep_msg->resp_resources;
1577 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1578 param->failover_accepted = cm_rep_get_failover(rep_msg);
1579 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1580 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1581 param->srq = cm_rep_get_srq(rep_msg);
1582 work->cm_event.private_data = &rep_msg->private_data;
1583 }
1584
1585 static void cm_dup_rep_handler(struct cm_work *work)
1586 {
1587 struct cm_id_private *cm_id_priv;
1588 struct cm_rep_msg *rep_msg;
1589 struct ib_mad_send_buf *msg = NULL;
1590 unsigned long flags;
1591 int ret;
1592
1593 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1594 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1595 rep_msg->local_comm_id);
1596 if (!cm_id_priv)
1597 return;
1598
1599 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1600 if (ret)
1601 goto deref;
1602
1603 spin_lock_irqsave(&cm_id_priv->lock, flags);
1604 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1605 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1606 cm_id_priv->private_data,
1607 cm_id_priv->private_data_len);
1608 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1609 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1610 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1611 cm_id_priv->private_data,
1612 cm_id_priv->private_data_len);
1613 else
1614 goto unlock;
1615 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1616
1617 ret = ib_post_send_mad(msg, NULL);
1618 if (ret)
1619 goto free;
1620 goto deref;
1621
1622 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1623 free: cm_free_msg(msg);
1624 deref: cm_deref_id(cm_id_priv);
1625 }
1626
1627 static int cm_rep_handler(struct cm_work *work)
1628 {
1629 struct cm_id_private *cm_id_priv;
1630 struct cm_rep_msg *rep_msg;
1631 unsigned long flags;
1632 int ret;
1633
1634 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1635 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1636 if (!cm_id_priv) {
1637 cm_dup_rep_handler(work);
1638 return -EINVAL;
1639 }
1640
1641 cm_format_rep_event(work);
1642
1643 spin_lock_irqsave(&cm_id_priv->lock, flags);
1644 switch (cm_id_priv->id.state) {
1645 case IB_CM_REQ_SENT:
1646 case IB_CM_MRA_REQ_RCVD:
1647 break;
1648 default:
1649 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1650 ret = -EINVAL;
1651 goto error;
1652 }
1653
1654 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1655 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1656 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1657
1658 spin_lock(&cm.lock);
1659 /* Check for duplicate REP. */
1660 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1661 spin_unlock(&cm.lock);
1662 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1663 ret = -EINVAL;
1664 goto error;
1665 }
1666 /* Check for a stale connection. */
1667 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1668 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1669 &cm.remote_id_table);
1670 cm_id_priv->timewait_info->inserted_remote_id = 0;
1671 spin_unlock(&cm.lock);
1672 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1673 cm_issue_rej(work->port, work->mad_recv_wc,
1674 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1675 NULL, 0);
1676 ret = -EINVAL;
1677 goto error;
1678 }
1679 spin_unlock(&cm.lock);
1680
1681 cm_id_priv->id.state = IB_CM_REP_RCVD;
1682 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1683 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1684 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1685 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1686 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1687 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1688
1689 /* todo: handle peer_to_peer */
1690
1691 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1692 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1693 if (!ret)
1694 list_add_tail(&work->list, &cm_id_priv->work_list);
1695 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1696
1697 if (ret)
1698 cm_process_work(cm_id_priv, work);
1699 else
1700 cm_deref_id(cm_id_priv);
1701 return 0;
1702
1703 error:
1704 cm_deref_id(cm_id_priv);
1705 return ret;
1706 }
1707
1708 static int cm_establish_handler(struct cm_work *work)
1709 {
1710 struct cm_id_private *cm_id_priv;
1711 unsigned long flags;
1712 int ret;
1713
1714 /* See comment in ib_cm_establish about lookup. */
1715 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1716 if (!cm_id_priv)
1717 return -EINVAL;
1718
1719 spin_lock_irqsave(&cm_id_priv->lock, flags);
1720 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1721 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1722 goto out;
1723 }
1724
1725 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1726 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1727 if (!ret)
1728 list_add_tail(&work->list, &cm_id_priv->work_list);
1729 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1730
1731 if (ret)
1732 cm_process_work(cm_id_priv, work);
1733 else
1734 cm_deref_id(cm_id_priv);
1735 return 0;
1736 out:
1737 cm_deref_id(cm_id_priv);
1738 return -EINVAL;
1739 }
1740
1741 static int cm_rtu_handler(struct cm_work *work)
1742 {
1743 struct cm_id_private *cm_id_priv;
1744 struct cm_rtu_msg *rtu_msg;
1745 unsigned long flags;
1746 int ret;
1747
1748 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1749 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1750 rtu_msg->local_comm_id);
1751 if (!cm_id_priv)
1752 return -EINVAL;
1753
1754 work->cm_event.private_data = &rtu_msg->private_data;
1755
1756 spin_lock_irqsave(&cm_id_priv->lock, flags);
1757 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1758 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1759 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1760 goto out;
1761 }
1762 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1763
1764 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1765 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1766 if (!ret)
1767 list_add_tail(&work->list, &cm_id_priv->work_list);
1768 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1769
1770 if (ret)
1771 cm_process_work(cm_id_priv, work);
1772 else
1773 cm_deref_id(cm_id_priv);
1774 return 0;
1775 out:
1776 cm_deref_id(cm_id_priv);
1777 return -EINVAL;
1778 }
1779
1780 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1781 struct cm_id_private *cm_id_priv,
1782 const void *private_data,
1783 u8 private_data_len)
1784 {
1785 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1786 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1787 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1788 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1789 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1790
1791 if (private_data && private_data_len)
1792 memcpy(dreq_msg->private_data, private_data, private_data_len);
1793 }
1794
1795 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1796 const void *private_data,
1797 u8 private_data_len)
1798 {
1799 struct cm_id_private *cm_id_priv;
1800 struct ib_mad_send_buf *msg;
1801 unsigned long flags;
1802 int ret;
1803
1804 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1805 return -EINVAL;
1806
1807 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1808 spin_lock_irqsave(&cm_id_priv->lock, flags);
1809 if (cm_id->state != IB_CM_ESTABLISHED) {
1810 ret = -EINVAL;
1811 goto out;
1812 }
1813
1814 ret = cm_alloc_msg(cm_id_priv, &msg);
1815 if (ret) {
1816 cm_enter_timewait(cm_id_priv);
1817 goto out;
1818 }
1819
1820 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1821 private_data, private_data_len);
1822 msg->timeout_ms = cm_id_priv->timeout_ms;
1823 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1824
1825 ret = ib_post_send_mad(msg, NULL);
1826 if (ret) {
1827 cm_enter_timewait(cm_id_priv);
1828 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1829 cm_free_msg(msg);
1830 return ret;
1831 }
1832
1833 cm_id->state = IB_CM_DREQ_SENT;
1834 cm_id_priv->msg = msg;
1835 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1836 return ret;
1837 }
1838 EXPORT_SYMBOL(ib_send_cm_dreq);
1839
1840 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1841 struct cm_id_private *cm_id_priv,
1842 const void *private_data,
1843 u8 private_data_len)
1844 {
1845 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1846 drep_msg->local_comm_id = cm_id_priv->id.local_id;
1847 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1848
1849 if (private_data && private_data_len)
1850 memcpy(drep_msg->private_data, private_data, private_data_len);
1851 }
1852
1853 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1854 const void *private_data,
1855 u8 private_data_len)
1856 {
1857 struct cm_id_private *cm_id_priv;
1858 struct ib_mad_send_buf *msg;
1859 unsigned long flags;
1860 void *data;
1861 int ret;
1862
1863 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1864 return -EINVAL;
1865
1866 data = cm_copy_private_data(private_data, private_data_len);
1867 if (IS_ERR(data))
1868 return PTR_ERR(data);
1869
1870 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1871 spin_lock_irqsave(&cm_id_priv->lock, flags);
1872 if (cm_id->state != IB_CM_DREQ_RCVD) {
1873 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1874 kfree(data);
1875 return -EINVAL;
1876 }
1877
1878 cm_set_private_data(cm_id_priv, data, private_data_len);
1879 cm_enter_timewait(cm_id_priv);
1880
1881 ret = cm_alloc_msg(cm_id_priv, &msg);
1882 if (ret)
1883 goto out;
1884
1885 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1886 private_data, private_data_len);
1887
1888 ret = ib_post_send_mad(msg, NULL);
1889 if (ret) {
1890 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1891 cm_free_msg(msg);
1892 return ret;
1893 }
1894
1895 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1896 return ret;
1897 }
1898 EXPORT_SYMBOL(ib_send_cm_drep);
1899
1900 static int cm_dreq_handler(struct cm_work *work)
1901 {
1902 struct cm_id_private *cm_id_priv;
1903 struct cm_dreq_msg *dreq_msg;
1904 struct ib_mad_send_buf *msg = NULL;
1905 unsigned long flags;
1906 int ret;
1907
1908 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1909 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1910 dreq_msg->local_comm_id);
1911 if (!cm_id_priv)
1912 return -EINVAL;
1913
1914 work->cm_event.private_data = &dreq_msg->private_data;
1915
1916 spin_lock_irqsave(&cm_id_priv->lock, flags);
1917 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1918 goto unlock;
1919
1920 switch (cm_id_priv->id.state) {
1921 case IB_CM_REP_SENT:
1922 case IB_CM_DREQ_SENT:
1923 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1924 break;
1925 case IB_CM_ESTABLISHED:
1926 case IB_CM_MRA_REP_RCVD:
1927 break;
1928 case IB_CM_TIMEWAIT:
1929 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1930 goto unlock;
1931
1932 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1933 cm_id_priv->private_data,
1934 cm_id_priv->private_data_len);
1935 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1936
1937 if (ib_post_send_mad(msg, NULL))
1938 cm_free_msg(msg);
1939 goto deref;
1940 default:
1941 goto unlock;
1942 }
1943 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1944 cm_id_priv->tid = dreq_msg->hdr.tid;
1945 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1946 if (!ret)
1947 list_add_tail(&work->list, &cm_id_priv->work_list);
1948 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1949
1950 if (ret)
1951 cm_process_work(cm_id_priv, work);
1952 else
1953 cm_deref_id(cm_id_priv);
1954 return 0;
1955
1956 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1957 deref: cm_deref_id(cm_id_priv);
1958 return -EINVAL;
1959 }
1960
1961 static int cm_drep_handler(struct cm_work *work)
1962 {
1963 struct cm_id_private *cm_id_priv;
1964 struct cm_drep_msg *drep_msg;
1965 unsigned long flags;
1966 int ret;
1967
1968 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1969 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1970 drep_msg->local_comm_id);
1971 if (!cm_id_priv)
1972 return -EINVAL;
1973
1974 work->cm_event.private_data = &drep_msg->private_data;
1975
1976 spin_lock_irqsave(&cm_id_priv->lock, flags);
1977 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1978 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1979 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1980 goto out;
1981 }
1982 cm_enter_timewait(cm_id_priv);
1983
1984 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1985 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1986 if (!ret)
1987 list_add_tail(&work->list, &cm_id_priv->work_list);
1988 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1989
1990 if (ret)
1991 cm_process_work(cm_id_priv, work);
1992 else
1993 cm_deref_id(cm_id_priv);
1994 return 0;
1995 out:
1996 cm_deref_id(cm_id_priv);
1997 return -EINVAL;
1998 }
1999
2000 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2001 enum ib_cm_rej_reason reason,
2002 void *ari,
2003 u8 ari_length,
2004 const void *private_data,
2005 u8 private_data_len)
2006 {
2007 struct cm_id_private *cm_id_priv;
2008 struct ib_mad_send_buf *msg;
2009 unsigned long flags;
2010 int ret;
2011
2012 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2013 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2014 return -EINVAL;
2015
2016 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2017
2018 spin_lock_irqsave(&cm_id_priv->lock, flags);
2019 switch (cm_id->state) {
2020 case IB_CM_REQ_SENT:
2021 case IB_CM_MRA_REQ_RCVD:
2022 case IB_CM_REQ_RCVD:
2023 case IB_CM_MRA_REQ_SENT:
2024 case IB_CM_REP_RCVD:
2025 case IB_CM_MRA_REP_SENT:
2026 ret = cm_alloc_msg(cm_id_priv, &msg);
2027 if (!ret)
2028 cm_format_rej((struct cm_rej_msg *) msg->mad,
2029 cm_id_priv, reason, ari, ari_length,
2030 private_data, private_data_len);
2031
2032 cm_reset_to_idle(cm_id_priv);
2033 break;
2034 case IB_CM_REP_SENT:
2035 case IB_CM_MRA_REP_RCVD:
2036 ret = cm_alloc_msg(cm_id_priv, &msg);
2037 if (!ret)
2038 cm_format_rej((struct cm_rej_msg *) msg->mad,
2039 cm_id_priv, reason, ari, ari_length,
2040 private_data, private_data_len);
2041
2042 cm_enter_timewait(cm_id_priv);
2043 break;
2044 default:
2045 ret = -EINVAL;
2046 goto out;
2047 }
2048
2049 if (ret)
2050 goto out;
2051
2052 ret = ib_post_send_mad(msg, NULL);
2053 if (ret)
2054 cm_free_msg(msg);
2055
2056 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2057 return ret;
2058 }
2059 EXPORT_SYMBOL(ib_send_cm_rej);
2060
2061 static void cm_format_rej_event(struct cm_work *work)
2062 {
2063 struct cm_rej_msg *rej_msg;
2064 struct ib_cm_rej_event_param *param;
2065
2066 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2067 param = &work->cm_event.param.rej_rcvd;
2068 param->ari = rej_msg->ari;
2069 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2070 param->reason = __be16_to_cpu(rej_msg->reason);
2071 work->cm_event.private_data = &rej_msg->private_data;
2072 }
2073
2074 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2075 {
2076 struct cm_timewait_info *timewait_info;
2077 struct cm_id_private *cm_id_priv;
2078 unsigned long flags;
2079 __be32 remote_id;
2080
2081 remote_id = rej_msg->local_comm_id;
2082
2083 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2084 spin_lock_irqsave(&cm.lock, flags);
2085 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2086 remote_id);
2087 if (!timewait_info) {
2088 spin_unlock_irqrestore(&cm.lock, flags);
2089 return NULL;
2090 }
2091 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2092 (timewait_info->work.local_id ^
2093 cm.random_id_operand));
2094 if (cm_id_priv) {
2095 if (cm_id_priv->id.remote_id == remote_id)
2096 atomic_inc(&cm_id_priv->refcount);
2097 else
2098 cm_id_priv = NULL;
2099 }
2100 spin_unlock_irqrestore(&cm.lock, flags);
2101 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2102 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2103 else
2104 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2105
2106 return cm_id_priv;
2107 }
2108
2109 static int cm_rej_handler(struct cm_work *work)
2110 {
2111 struct cm_id_private *cm_id_priv;
2112 struct cm_rej_msg *rej_msg;
2113 unsigned long flags;
2114 int ret;
2115
2116 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2117 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2118 if (!cm_id_priv)
2119 return -EINVAL;
2120
2121 cm_format_rej_event(work);
2122
2123 spin_lock_irqsave(&cm_id_priv->lock, flags);
2124 switch (cm_id_priv->id.state) {
2125 case IB_CM_REQ_SENT:
2126 case IB_CM_MRA_REQ_RCVD:
2127 case IB_CM_REP_SENT:
2128 case IB_CM_MRA_REP_RCVD:
2129 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2130 /* fall through */
2131 case IB_CM_REQ_RCVD:
2132 case IB_CM_MRA_REQ_SENT:
2133 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2134 cm_enter_timewait(cm_id_priv);
2135 else
2136 cm_reset_to_idle(cm_id_priv);
2137 break;
2138 case IB_CM_DREQ_SENT:
2139 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2140 /* fall through */
2141 case IB_CM_REP_RCVD:
2142 case IB_CM_MRA_REP_SENT:
2143 case IB_CM_ESTABLISHED:
2144 cm_enter_timewait(cm_id_priv);
2145 break;
2146 default:
2147 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2148 ret = -EINVAL;
2149 goto out;
2150 }
2151
2152 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2153 if (!ret)
2154 list_add_tail(&work->list, &cm_id_priv->work_list);
2155 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2156
2157 if (ret)
2158 cm_process_work(cm_id_priv, work);
2159 else
2160 cm_deref_id(cm_id_priv);
2161 return 0;
2162 out:
2163 cm_deref_id(cm_id_priv);
2164 return -EINVAL;
2165 }
2166
2167 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2168 u8 service_timeout,
2169 const void *private_data,
2170 u8 private_data_len)
2171 {
2172 struct cm_id_private *cm_id_priv;
2173 struct ib_mad_send_buf *msg;
2174 void *data;
2175 unsigned long flags;
2176 int ret;
2177
2178 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2179 return -EINVAL;
2180
2181 data = cm_copy_private_data(private_data, private_data_len);
2182 if (IS_ERR(data))
2183 return PTR_ERR(data);
2184
2185 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2186
2187 spin_lock_irqsave(&cm_id_priv->lock, flags);
2188 switch(cm_id_priv->id.state) {
2189 case IB_CM_REQ_RCVD:
2190 ret = cm_alloc_msg(cm_id_priv, &msg);
2191 if (ret)
2192 goto error1;
2193
2194 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2195 CM_MSG_RESPONSE_REQ, service_timeout,
2196 private_data, private_data_len);
2197 ret = ib_post_send_mad(msg, NULL);
2198 if (ret)
2199 goto error2;
2200 cm_id->state = IB_CM_MRA_REQ_SENT;
2201 break;
2202 case IB_CM_REP_RCVD:
2203 ret = cm_alloc_msg(cm_id_priv, &msg);
2204 if (ret)
2205 goto error1;
2206
2207 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2208 CM_MSG_RESPONSE_REP, service_timeout,
2209 private_data, private_data_len);
2210 ret = ib_post_send_mad(msg, NULL);
2211 if (ret)
2212 goto error2;
2213 cm_id->state = IB_CM_MRA_REP_SENT;
2214 break;
2215 case IB_CM_ESTABLISHED:
2216 ret = cm_alloc_msg(cm_id_priv, &msg);
2217 if (ret)
2218 goto error1;
2219
2220 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2221 CM_MSG_RESPONSE_OTHER, service_timeout,
2222 private_data, private_data_len);
2223 ret = ib_post_send_mad(msg, NULL);
2224 if (ret)
2225 goto error2;
2226 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2227 break;
2228 default:
2229 ret = -EINVAL;
2230 goto error1;
2231 }
2232 cm_id_priv->service_timeout = service_timeout;
2233 cm_set_private_data(cm_id_priv, data, private_data_len);
2234 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2235 return 0;
2236
2237 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2238 kfree(data);
2239 return ret;
2240
2241 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2242 kfree(data);
2243 cm_free_msg(msg);
2244 return ret;
2245 }
2246 EXPORT_SYMBOL(ib_send_cm_mra);
2247
2248 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2249 {
2250 switch (cm_mra_get_msg_mraed(mra_msg)) {
2251 case CM_MSG_RESPONSE_REQ:
2252 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2253 case CM_MSG_RESPONSE_REP:
2254 case CM_MSG_RESPONSE_OTHER:
2255 return cm_acquire_id(mra_msg->remote_comm_id,
2256 mra_msg->local_comm_id);
2257 default:
2258 return NULL;
2259 }
2260 }
2261
2262 static int cm_mra_handler(struct cm_work *work)
2263 {
2264 struct cm_id_private *cm_id_priv;
2265 struct cm_mra_msg *mra_msg;
2266 unsigned long flags;
2267 int timeout, ret;
2268
2269 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2270 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2271 if (!cm_id_priv)
2272 return -EINVAL;
2273
2274 work->cm_event.private_data = &mra_msg->private_data;
2275 work->cm_event.param.mra_rcvd.service_timeout =
2276 cm_mra_get_service_timeout(mra_msg);
2277 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2278 cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2279
2280 spin_lock_irqsave(&cm_id_priv->lock, flags);
2281 switch (cm_id_priv->id.state) {
2282 case IB_CM_REQ_SENT:
2283 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2284 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2285 cm_id_priv->msg, timeout))
2286 goto out;
2287 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2288 break;
2289 case IB_CM_REP_SENT:
2290 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2291 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2292 cm_id_priv->msg, timeout))
2293 goto out;
2294 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2295 break;
2296 case IB_CM_ESTABLISHED:
2297 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2298 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2299 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2300 cm_id_priv->msg, timeout))
2301 goto out;
2302 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2303 break;
2304 default:
2305 goto out;
2306 }
2307
2308 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2309 cm_id_priv->id.state;
2310 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2311 if (!ret)
2312 list_add_tail(&work->list, &cm_id_priv->work_list);
2313 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2314
2315 if (ret)
2316 cm_process_work(cm_id_priv, work);
2317 else
2318 cm_deref_id(cm_id_priv);
2319 return 0;
2320 out:
2321 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2322 cm_deref_id(cm_id_priv);
2323 return -EINVAL;
2324 }
2325
2326 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2327 struct cm_id_private *cm_id_priv,
2328 struct ib_sa_path_rec *alternate_path,
2329 const void *private_data,
2330 u8 private_data_len)
2331 {
2332 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2333 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2334 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2335 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2336 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2337 /* todo: need remote CM response timeout */
2338 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2339 lap_msg->alt_local_lid = alternate_path->slid;
2340 lap_msg->alt_remote_lid = alternate_path->dlid;
2341 lap_msg->alt_local_gid = alternate_path->sgid;
2342 lap_msg->alt_remote_gid = alternate_path->dgid;
2343 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2344 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2345 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2346 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2347 cm_lap_set_sl(lap_msg, alternate_path->sl);
2348 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2349 cm_lap_set_local_ack_timeout(lap_msg,
2350 min(31, alternate_path->packet_life_time + 1));
2351
2352 if (private_data && private_data_len)
2353 memcpy(lap_msg->private_data, private_data, private_data_len);
2354 }
2355
2356 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2357 struct ib_sa_path_rec *alternate_path,
2358 const void *private_data,
2359 u8 private_data_len)
2360 {
2361 struct cm_id_private *cm_id_priv;
2362 struct ib_mad_send_buf *msg;
2363 unsigned long flags;
2364 int ret;
2365
2366 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2367 return -EINVAL;
2368
2369 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2370 spin_lock_irqsave(&cm_id_priv->lock, flags);
2371 if (cm_id->state != IB_CM_ESTABLISHED ||
2372 cm_id->lap_state != IB_CM_LAP_IDLE) {
2373 ret = -EINVAL;
2374 goto out;
2375 }
2376
2377 ret = cm_alloc_msg(cm_id_priv, &msg);
2378 if (ret)
2379 goto out;
2380
2381 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2382 alternate_path, private_data, private_data_len);
2383 msg->timeout_ms = cm_id_priv->timeout_ms;
2384 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2385
2386 ret = ib_post_send_mad(msg, NULL);
2387 if (ret) {
2388 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2389 cm_free_msg(msg);
2390 return ret;
2391 }
2392
2393 cm_id->lap_state = IB_CM_LAP_SENT;
2394 cm_id_priv->msg = msg;
2395
2396 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2397 return ret;
2398 }
2399 EXPORT_SYMBOL(ib_send_cm_lap);
2400
2401 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2402 struct cm_lap_msg *lap_msg)
2403 {
2404 memset(path, 0, sizeof *path);
2405 path->dgid = lap_msg->alt_local_gid;
2406 path->sgid = lap_msg->alt_remote_gid;
2407 path->dlid = lap_msg->alt_local_lid;
2408 path->slid = lap_msg->alt_remote_lid;
2409 path->flow_label = cm_lap_get_flow_label(lap_msg);
2410 path->hop_limit = lap_msg->alt_hop_limit;
2411 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2412 path->reversible = 1;
2413 /* pkey is same as in REQ */
2414 path->sl = cm_lap_get_sl(lap_msg);
2415 path->mtu_selector = IB_SA_EQ;
2416 /* mtu is same as in REQ */
2417 path->rate_selector = IB_SA_EQ;
2418 path->rate = cm_lap_get_packet_rate(lap_msg);
2419 path->packet_life_time_selector = IB_SA_EQ;
2420 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2421 path->packet_life_time -= (path->packet_life_time > 0);
2422 }
2423
2424 static int cm_lap_handler(struct cm_work *work)
2425 {
2426 struct cm_id_private *cm_id_priv;
2427 struct cm_lap_msg *lap_msg;
2428 struct ib_cm_lap_event_param *param;
2429 struct ib_mad_send_buf *msg = NULL;
2430 unsigned long flags;
2431 int ret;
2432
2433 /* todo: verify LAP request and send reject APR if invalid. */
2434 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2435 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2436 lap_msg->local_comm_id);
2437 if (!cm_id_priv)
2438 return -EINVAL;
2439
2440 param = &work->cm_event.param.lap_rcvd;
2441 param->alternate_path = &work->path[0];
2442 cm_format_path_from_lap(param->alternate_path, lap_msg);
2443 work->cm_event.private_data = &lap_msg->private_data;
2444
2445 spin_lock_irqsave(&cm_id_priv->lock, flags);
2446 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2447 goto unlock;
2448
2449 switch (cm_id_priv->id.lap_state) {
2450 case IB_CM_LAP_IDLE:
2451 break;
2452 case IB_CM_MRA_LAP_SENT:
2453 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2454 goto unlock;
2455
2456 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2457 CM_MSG_RESPONSE_OTHER,
2458 cm_id_priv->service_timeout,
2459 cm_id_priv->private_data,
2460 cm_id_priv->private_data_len);
2461 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2462
2463 if (ib_post_send_mad(msg, NULL))
2464 cm_free_msg(msg);
2465 goto deref;
2466 default:
2467 goto unlock;
2468 }
2469
2470 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2471 cm_id_priv->tid = lap_msg->hdr.tid;
2472 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2473 if (!ret)
2474 list_add_tail(&work->list, &cm_id_priv->work_list);
2475 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2476
2477 if (ret)
2478 cm_process_work(cm_id_priv, work);
2479 else
2480 cm_deref_id(cm_id_priv);
2481 return 0;
2482
2483 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2484 deref: cm_deref_id(cm_id_priv);
2485 return -EINVAL;
2486 }
2487
2488 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2489 struct cm_id_private *cm_id_priv,
2490 enum ib_cm_apr_status status,
2491 void *info,
2492 u8 info_length,
2493 const void *private_data,
2494 u8 private_data_len)
2495 {
2496 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2497 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2498 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2499 apr_msg->ap_status = (u8) status;
2500
2501 if (info && info_length) {
2502 apr_msg->info_length = info_length;
2503 memcpy(apr_msg->info, info, info_length);
2504 }
2505
2506 if (private_data && private_data_len)
2507 memcpy(apr_msg->private_data, private_data, private_data_len);
2508 }
2509
2510 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2511 enum ib_cm_apr_status status,
2512 void *info,
2513 u8 info_length,
2514 const void *private_data,
2515 u8 private_data_len)
2516 {
2517 struct cm_id_private *cm_id_priv;
2518 struct ib_mad_send_buf *msg;
2519 unsigned long flags;
2520 int ret;
2521
2522 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2523 (info && info_length > IB_CM_APR_INFO_LENGTH))
2524 return -EINVAL;
2525
2526 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2527 spin_lock_irqsave(&cm_id_priv->lock, flags);
2528 if (cm_id->state != IB_CM_ESTABLISHED ||
2529 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2530 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2531 ret = -EINVAL;
2532 goto out;
2533 }
2534
2535 ret = cm_alloc_msg(cm_id_priv, &msg);
2536 if (ret)
2537 goto out;
2538
2539 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2540 info, info_length, private_data, private_data_len);
2541 ret = ib_post_send_mad(msg, NULL);
2542 if (ret) {
2543 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2544 cm_free_msg(msg);
2545 return ret;
2546 }
2547
2548 cm_id->lap_state = IB_CM_LAP_IDLE;
2549 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2550 return ret;
2551 }
2552 EXPORT_SYMBOL(ib_send_cm_apr);
2553
2554 static int cm_apr_handler(struct cm_work *work)
2555 {
2556 struct cm_id_private *cm_id_priv;
2557 struct cm_apr_msg *apr_msg;
2558 unsigned long flags;
2559 int ret;
2560
2561 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2562 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2563 apr_msg->local_comm_id);
2564 if (!cm_id_priv)
2565 return -EINVAL; /* Unmatched reply. */
2566
2567 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2568 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2569 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2570 work->cm_event.private_data = &apr_msg->private_data;
2571
2572 spin_lock_irqsave(&cm_id_priv->lock, flags);
2573 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2574 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2575 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2576 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2577 goto out;
2578 }
2579 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2580 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2581 cm_id_priv->msg = NULL;
2582
2583 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2584 if (!ret)
2585 list_add_tail(&work->list, &cm_id_priv->work_list);
2586 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2587
2588 if (ret)
2589 cm_process_work(cm_id_priv, work);
2590 else
2591 cm_deref_id(cm_id_priv);
2592 return 0;
2593 out:
2594 cm_deref_id(cm_id_priv);
2595 return -EINVAL;
2596 }
2597
2598 static int cm_timewait_handler(struct cm_work *work)
2599 {
2600 struct cm_timewait_info *timewait_info;
2601 struct cm_id_private *cm_id_priv;
2602 unsigned long flags;
2603 int ret;
2604
2605 timewait_info = (struct cm_timewait_info *)work;
2606 cm_cleanup_timewait(timewait_info);
2607
2608 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2609 timewait_info->work.remote_id);
2610 if (!cm_id_priv)
2611 return -EINVAL;
2612
2613 spin_lock_irqsave(&cm_id_priv->lock, flags);
2614 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2615 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2616 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2617 goto out;
2618 }
2619 cm_id_priv->id.state = IB_CM_IDLE;
2620 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2621 if (!ret)
2622 list_add_tail(&work->list, &cm_id_priv->work_list);
2623 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2624
2625 if (ret)
2626 cm_process_work(cm_id_priv, work);
2627 else
2628 cm_deref_id(cm_id_priv);
2629 return 0;
2630 out:
2631 cm_deref_id(cm_id_priv);
2632 return -EINVAL;
2633 }
2634
2635 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2636 struct cm_id_private *cm_id_priv,
2637 struct ib_cm_sidr_req_param *param)
2638 {
2639 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2640 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2641 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2642 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2643 sidr_req_msg->service_id = param->service_id;
2644
2645 if (param->private_data && param->private_data_len)
2646 memcpy(sidr_req_msg->private_data, param->private_data,
2647 param->private_data_len);
2648 }
2649
2650 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2651 struct ib_cm_sidr_req_param *param)
2652 {
2653 struct cm_id_private *cm_id_priv;
2654 struct ib_mad_send_buf *msg;
2655 unsigned long flags;
2656 int ret;
2657
2658 if (!param->path || (param->private_data &&
2659 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2660 return -EINVAL;
2661
2662 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2663 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2664 if (ret)
2665 goto out;
2666
2667 cm_id->service_id = param->service_id;
2668 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2669 cm_id_priv->timeout_ms = param->timeout_ms;
2670 cm_id_priv->max_cm_retries = param->max_cm_retries;
2671 ret = cm_alloc_msg(cm_id_priv, &msg);
2672 if (ret)
2673 goto out;
2674
2675 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2676 param);
2677 msg->timeout_ms = cm_id_priv->timeout_ms;
2678 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2679
2680 spin_lock_irqsave(&cm_id_priv->lock, flags);
2681 if (cm_id->state == IB_CM_IDLE)
2682 ret = ib_post_send_mad(msg, NULL);
2683 else
2684 ret = -EINVAL;
2685
2686 if (ret) {
2687 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2688 cm_free_msg(msg);
2689 goto out;
2690 }
2691 cm_id->state = IB_CM_SIDR_REQ_SENT;
2692 cm_id_priv->msg = msg;
2693 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2694 out:
2695 return ret;
2696 }
2697 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2698
2699 static void cm_format_sidr_req_event(struct cm_work *work,
2700 struct ib_cm_id *listen_id)
2701 {
2702 struct cm_sidr_req_msg *sidr_req_msg;
2703 struct ib_cm_sidr_req_event_param *param;
2704
2705 sidr_req_msg = (struct cm_sidr_req_msg *)
2706 work->mad_recv_wc->recv_buf.mad;
2707 param = &work->cm_event.param.sidr_req_rcvd;
2708 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2709 param->listen_id = listen_id;
2710 param->port = work->port->port_num;
2711 work->cm_event.private_data = &sidr_req_msg->private_data;
2712 }
2713
2714 static int cm_sidr_req_handler(struct cm_work *work)
2715 {
2716 struct ib_cm_id *cm_id;
2717 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2718 struct cm_sidr_req_msg *sidr_req_msg;
2719 struct ib_wc *wc;
2720 unsigned long flags;
2721
2722 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2723 if (IS_ERR(cm_id))
2724 return PTR_ERR(cm_id);
2725 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2726
2727 /* Record SGID/SLID and request ID for lookup. */
2728 sidr_req_msg = (struct cm_sidr_req_msg *)
2729 work->mad_recv_wc->recv_buf.mad;
2730 wc = work->mad_recv_wc->wc;
2731 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2732 cm_id_priv->av.dgid.global.interface_id = 0;
2733 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2734 work->mad_recv_wc->recv_buf.grh,
2735 &cm_id_priv->av);
2736 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2737 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2738 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2739 atomic_inc(&cm_id_priv->work_count);
2740
2741 spin_lock_irqsave(&cm.lock, flags);
2742 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2743 if (cur_cm_id_priv) {
2744 spin_unlock_irqrestore(&cm.lock, flags);
2745 goto out; /* Duplicate message. */
2746 }
2747 cur_cm_id_priv = cm_find_listen(cm_id->device,
2748 sidr_req_msg->service_id,
2749 sidr_req_msg->private_data);
2750 if (!cur_cm_id_priv) {
2751 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2752 spin_unlock_irqrestore(&cm.lock, flags);
2753 /* todo: reply with no match */
2754 goto out; /* No match. */
2755 }
2756 atomic_inc(&cur_cm_id_priv->refcount);
2757 spin_unlock_irqrestore(&cm.lock, flags);
2758
2759 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2760 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2761 cm_id_priv->id.service_id = sidr_req_msg->service_id;
2762 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2763
2764 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2765 cm_process_work(cm_id_priv, work);
2766 cm_deref_id(cur_cm_id_priv);
2767 return 0;
2768 out:
2769 ib_destroy_cm_id(&cm_id_priv->id);
2770 return -EINVAL;
2771 }
2772
2773 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2774 struct cm_id_private *cm_id_priv,
2775 struct ib_cm_sidr_rep_param *param)
2776 {
2777 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2778 cm_id_priv->tid);
2779 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2780 sidr_rep_msg->status = param->status;
2781 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2782 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2783 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2784
2785 if (param->info && param->info_length)
2786 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2787
2788 if (param->private_data && param->private_data_len)
2789 memcpy(sidr_rep_msg->private_data, param->private_data,
2790 param->private_data_len);
2791 }
2792
2793 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2794 struct ib_cm_sidr_rep_param *param)
2795 {
2796 struct cm_id_private *cm_id_priv;
2797 struct ib_mad_send_buf *msg;
2798 unsigned long flags;
2799 int ret;
2800
2801 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2802 (param->private_data &&
2803 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2804 return -EINVAL;
2805
2806 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2807 spin_lock_irqsave(&cm_id_priv->lock, flags);
2808 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2809 ret = -EINVAL;
2810 goto error;
2811 }
2812
2813 ret = cm_alloc_msg(cm_id_priv, &msg);
2814 if (ret)
2815 goto error;
2816
2817 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2818 param);
2819 ret = ib_post_send_mad(msg, NULL);
2820 if (ret) {
2821 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2822 cm_free_msg(msg);
2823 return ret;
2824 }
2825 cm_id->state = IB_CM_IDLE;
2826 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2827
2828 spin_lock_irqsave(&cm.lock, flags);
2829 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2830 spin_unlock_irqrestore(&cm.lock, flags);
2831 return 0;
2832
2833 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2834 return ret;
2835 }
2836 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2837
2838 static void cm_format_sidr_rep_event(struct cm_work *work)
2839 {
2840 struct cm_sidr_rep_msg *sidr_rep_msg;
2841 struct ib_cm_sidr_rep_event_param *param;
2842
2843 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2844 work->mad_recv_wc->recv_buf.mad;
2845 param = &work->cm_event.param.sidr_rep_rcvd;
2846 param->status = sidr_rep_msg->status;
2847 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2848 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2849 param->info = &sidr_rep_msg->info;
2850 param->info_len = sidr_rep_msg->info_length;
2851 work->cm_event.private_data = &sidr_rep_msg->private_data;
2852 }
2853
2854 static int cm_sidr_rep_handler(struct cm_work *work)
2855 {
2856 struct cm_sidr_rep_msg *sidr_rep_msg;
2857 struct cm_id_private *cm_id_priv;
2858 unsigned long flags;
2859
2860 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2861 work->mad_recv_wc->recv_buf.mad;
2862 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2863 if (!cm_id_priv)
2864 return -EINVAL; /* Unmatched reply. */
2865
2866 spin_lock_irqsave(&cm_id_priv->lock, flags);
2867 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2868 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2869 goto out;
2870 }
2871 cm_id_priv->id.state = IB_CM_IDLE;
2872 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2873 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2874
2875 cm_format_sidr_rep_event(work);
2876 cm_process_work(cm_id_priv, work);
2877 return 0;
2878 out:
2879 cm_deref_id(cm_id_priv);
2880 return -EINVAL;
2881 }
2882
2883 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2884 enum ib_wc_status wc_status)
2885 {
2886 struct cm_id_private *cm_id_priv;
2887 struct ib_cm_event cm_event;
2888 enum ib_cm_state state;
2889 unsigned long flags;
2890 int ret;
2891
2892 memset(&cm_event, 0, sizeof cm_event);
2893 cm_id_priv = msg->context[0];
2894
2895 /* Discard old sends or ones without a response. */
2896 spin_lock_irqsave(&cm_id_priv->lock, flags);
2897 state = (enum ib_cm_state) (unsigned long) msg->context[1];
2898 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2899 goto discard;
2900
2901 switch (state) {
2902 case IB_CM_REQ_SENT:
2903 case IB_CM_MRA_REQ_RCVD:
2904 cm_reset_to_idle(cm_id_priv);
2905 cm_event.event = IB_CM_REQ_ERROR;
2906 break;
2907 case IB_CM_REP_SENT:
2908 case IB_CM_MRA_REP_RCVD:
2909 cm_reset_to_idle(cm_id_priv);
2910 cm_event.event = IB_CM_REP_ERROR;
2911 break;
2912 case IB_CM_DREQ_SENT:
2913 cm_enter_timewait(cm_id_priv);
2914 cm_event.event = IB_CM_DREQ_ERROR;
2915 break;
2916 case IB_CM_SIDR_REQ_SENT:
2917 cm_id_priv->id.state = IB_CM_IDLE;
2918 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2919 break;
2920 default:
2921 goto discard;
2922 }
2923 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2924 cm_event.param.send_status = wc_status;
2925
2926 /* No other events can occur on the cm_id at this point. */
2927 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2928 cm_free_msg(msg);
2929 if (ret)
2930 ib_destroy_cm_id(&cm_id_priv->id);
2931 return;
2932 discard:
2933 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2934 cm_free_msg(msg);
2935 }
2936
2937 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2938 struct ib_mad_send_wc *mad_send_wc)
2939 {
2940 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2941
2942 switch (mad_send_wc->status) {
2943 case IB_WC_SUCCESS:
2944 case IB_WC_WR_FLUSH_ERR:
2945 cm_free_msg(msg);
2946 break;
2947 default:
2948 if (msg->context[0] && msg->context[1])
2949 cm_process_send_error(msg, mad_send_wc->status);
2950 else
2951 cm_free_msg(msg);
2952 break;
2953 }
2954 }
2955
2956 static void cm_work_handler(void *data)
2957 {
2958 struct cm_work *work = data;
2959 int ret;
2960
2961 switch (work->cm_event.event) {
2962 case IB_CM_REQ_RECEIVED:
2963 ret = cm_req_handler(work);
2964 break;
2965 case IB_CM_MRA_RECEIVED:
2966 ret = cm_mra_handler(work);
2967 break;
2968 case IB_CM_REJ_RECEIVED:
2969 ret = cm_rej_handler(work);
2970 break;
2971 case IB_CM_REP_RECEIVED:
2972 ret = cm_rep_handler(work);
2973 break;
2974 case IB_CM_RTU_RECEIVED:
2975 ret = cm_rtu_handler(work);
2976 break;
2977 case IB_CM_USER_ESTABLISHED:
2978 ret = cm_establish_handler(work);
2979 break;
2980 case IB_CM_DREQ_RECEIVED:
2981 ret = cm_dreq_handler(work);
2982 break;
2983 case IB_CM_DREP_RECEIVED:
2984 ret = cm_drep_handler(work);
2985 break;
2986 case IB_CM_SIDR_REQ_RECEIVED:
2987 ret = cm_sidr_req_handler(work);
2988 break;
2989 case IB_CM_SIDR_REP_RECEIVED:
2990 ret = cm_sidr_rep_handler(work);
2991 break;
2992 case IB_CM_LAP_RECEIVED:
2993 ret = cm_lap_handler(work);
2994 break;
2995 case IB_CM_APR_RECEIVED:
2996 ret = cm_apr_handler(work);
2997 break;
2998 case IB_CM_TIMEWAIT_EXIT:
2999 ret = cm_timewait_handler(work);
3000 break;
3001 default:
3002 ret = -EINVAL;
3003 break;
3004 }
3005 if (ret)
3006 cm_free_work(work);
3007 }
3008
3009 int ib_cm_establish(struct ib_cm_id *cm_id)
3010 {
3011 struct cm_id_private *cm_id_priv;
3012 struct cm_work *work;
3013 unsigned long flags;
3014 int ret = 0;
3015
3016 work = kmalloc(sizeof *work, GFP_ATOMIC);
3017 if (!work)
3018 return -ENOMEM;
3019
3020 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3021 spin_lock_irqsave(&cm_id_priv->lock, flags);
3022 switch (cm_id->state)
3023 {
3024 case IB_CM_REP_SENT:
3025 case IB_CM_MRA_REP_RCVD:
3026 cm_id->state = IB_CM_ESTABLISHED;
3027 break;
3028 case IB_CM_ESTABLISHED:
3029 ret = -EISCONN;
3030 break;
3031 default:
3032 ret = -EINVAL;
3033 break;
3034 }
3035 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3036
3037 if (ret) {
3038 kfree(work);
3039 goto out;
3040 }
3041
3042 /*
3043 * The CM worker thread may try to destroy the cm_id before it
3044 * can execute this work item. To prevent potential deadlock,
3045 * we need to find the cm_id once we're in the context of the
3046 * worker thread, rather than holding a reference on it.
3047 */
3048 INIT_WORK(&work->work, cm_work_handler, work);
3049 work->local_id = cm_id->local_id;
3050 work->remote_id = cm_id->remote_id;
3051 work->mad_recv_wc = NULL;
3052 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3053 queue_work(cm.wq, &work->work);
3054 out:
3055 return ret;
3056 }
3057 EXPORT_SYMBOL(ib_cm_establish);
3058
3059 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3060 struct ib_mad_recv_wc *mad_recv_wc)
3061 {
3062 struct cm_work *work;
3063 enum ib_cm_event_type event;
3064 int paths = 0;
3065
3066 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3067 case CM_REQ_ATTR_ID:
3068 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3069 alt_local_lid != 0);
3070 event = IB_CM_REQ_RECEIVED;
3071 break;
3072 case CM_MRA_ATTR_ID:
3073 event = IB_CM_MRA_RECEIVED;
3074 break;
3075 case CM_REJ_ATTR_ID:
3076 event = IB_CM_REJ_RECEIVED;
3077 break;
3078 case CM_REP_ATTR_ID:
3079 event = IB_CM_REP_RECEIVED;
3080 break;
3081 case CM_RTU_ATTR_ID:
3082 event = IB_CM_RTU_RECEIVED;
3083 break;
3084 case CM_DREQ_ATTR_ID:
3085 event = IB_CM_DREQ_RECEIVED;
3086 break;
3087 case CM_DREP_ATTR_ID:
3088 event = IB_CM_DREP_RECEIVED;
3089 break;
3090 case CM_SIDR_REQ_ATTR_ID:
3091 event = IB_CM_SIDR_REQ_RECEIVED;
3092 break;
3093 case CM_SIDR_REP_ATTR_ID:
3094 event = IB_CM_SIDR_REP_RECEIVED;
3095 break;
3096 case CM_LAP_ATTR_ID:
3097 paths = 1;
3098 event = IB_CM_LAP_RECEIVED;
3099 break;
3100 case CM_APR_ATTR_ID:
3101 event = IB_CM_APR_RECEIVED;
3102 break;
3103 default:
3104 ib_free_recv_mad(mad_recv_wc);
3105 return;
3106 }
3107
3108 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3109 GFP_KERNEL);
3110 if (!work) {
3111 ib_free_recv_mad(mad_recv_wc);
3112 return;
3113 }
3114
3115 INIT_WORK(&work->work, cm_work_handler, work);
3116 work->cm_event.event = event;
3117 work->mad_recv_wc = mad_recv_wc;
3118 work->port = (struct cm_port *)mad_agent->context;
3119 queue_work(cm.wq, &work->work);
3120 }
3121
3122 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3123 struct ib_qp_attr *qp_attr,
3124 int *qp_attr_mask)
3125 {
3126 unsigned long flags;
3127 int ret;
3128
3129 spin_lock_irqsave(&cm_id_priv->lock, flags);
3130 switch (cm_id_priv->id.state) {
3131 case IB_CM_REQ_SENT:
3132 case IB_CM_MRA_REQ_RCVD:
3133 case IB_CM_REQ_RCVD:
3134 case IB_CM_MRA_REQ_SENT:
3135 case IB_CM_REP_RCVD:
3136 case IB_CM_MRA_REP_SENT:
3137 case IB_CM_REP_SENT:
3138 case IB_CM_MRA_REP_RCVD:
3139 case IB_CM_ESTABLISHED:
3140 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3141 IB_QP_PKEY_INDEX | IB_QP_PORT;
3142 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3143 IB_ACCESS_REMOTE_WRITE;
3144 if (cm_id_priv->responder_resources)
3145 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3146 IB_ACCESS_REMOTE_ATOMIC;
3147 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3148 qp_attr->port_num = cm_id_priv->av.port->port_num;
3149 ret = 0;
3150 break;
3151 default:
3152 ret = -EINVAL;
3153 break;
3154 }
3155 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3156 return ret;
3157 }
3158
3159 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3160 struct ib_qp_attr *qp_attr,
3161 int *qp_attr_mask)
3162 {
3163 unsigned long flags;
3164 int ret;
3165
3166 spin_lock_irqsave(&cm_id_priv->lock, flags);
3167 switch (cm_id_priv->id.state) {
3168 case IB_CM_REQ_RCVD:
3169 case IB_CM_MRA_REQ_SENT:
3170 case IB_CM_REP_RCVD:
3171 case IB_CM_MRA_REP_SENT:
3172 case IB_CM_REP_SENT:
3173 case IB_CM_MRA_REP_RCVD:
3174 case IB_CM_ESTABLISHED:
3175 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3176 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3177 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3178 qp_attr->path_mtu = cm_id_priv->path_mtu;
3179 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3180 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3181 if (cm_id_priv->qp_type == IB_QPT_RC) {
3182 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3183 IB_QP_MIN_RNR_TIMER;
3184 qp_attr->max_dest_rd_atomic =
3185 cm_id_priv->responder_resources;
3186 qp_attr->min_rnr_timer = 0;
3187 }
3188 if (cm_id_priv->alt_av.ah_attr.dlid) {
3189 *qp_attr_mask |= IB_QP_ALT_PATH;
3190 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3191 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3192 }
3193 ret = 0;
3194 break;
3195 default:
3196 ret = -EINVAL;
3197 break;
3198 }
3199 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3200 return ret;
3201 }
3202
3203 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3204 struct ib_qp_attr *qp_attr,
3205 int *qp_attr_mask)
3206 {
3207 unsigned long flags;
3208 int ret;
3209
3210 spin_lock_irqsave(&cm_id_priv->lock, flags);
3211 switch (cm_id_priv->id.state) {
3212 case IB_CM_REP_RCVD:
3213 case IB_CM_MRA_REP_SENT:
3214 case IB_CM_REP_SENT:
3215 case IB_CM_MRA_REP_RCVD:
3216 case IB_CM_ESTABLISHED:
3217 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3218 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3219 if (cm_id_priv->qp_type == IB_QPT_RC) {
3220 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3221 IB_QP_RNR_RETRY |
3222 IB_QP_MAX_QP_RD_ATOMIC;
3223 qp_attr->timeout = cm_id_priv->local_ack_timeout;
3224 qp_attr->retry_cnt = cm_id_priv->retry_count;
3225 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3226 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3227 }
3228 if (cm_id_priv->alt_av.ah_attr.dlid) {
3229 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3230 qp_attr->path_mig_state = IB_MIG_REARM;
3231 }
3232 ret = 0;
3233 break;
3234 default:
3235 ret = -EINVAL;
3236 break;
3237 }
3238 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3239 return ret;
3240 }
3241
3242 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3243 struct ib_qp_attr *qp_attr,
3244 int *qp_attr_mask)
3245 {
3246 struct cm_id_private *cm_id_priv;
3247 int ret;
3248
3249 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3250 switch (qp_attr->qp_state) {
3251 case IB_QPS_INIT:
3252 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3253 break;
3254 case IB_QPS_RTR:
3255 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3256 break;
3257 case IB_QPS_RTS:
3258 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3259 break;
3260 default:
3261 ret = -EINVAL;
3262 break;
3263 }
3264 return ret;
3265 }
3266 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3267
3268 static void cm_add_one(struct ib_device *device)
3269 {
3270 struct cm_device *cm_dev;
3271 struct cm_port *port;
3272 struct ib_mad_reg_req reg_req = {
3273 .mgmt_class = IB_MGMT_CLASS_CM,
3274 .mgmt_class_version = IB_CM_CLASS_VERSION
3275 };
3276 struct ib_port_modify port_modify = {
3277 .set_port_cap_mask = IB_PORT_CM_SUP
3278 };
3279 unsigned long flags;
3280 int ret;
3281 u8 i;
3282
3283 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3284 device->phys_port_cnt, GFP_KERNEL);
3285 if (!cm_dev)
3286 return;
3287
3288 cm_dev->device = device;
3289 cm_dev->ca_guid = device->node_guid;
3290
3291 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3292 for (i = 1; i <= device->phys_port_cnt; i++) {
3293 port = &cm_dev->port[i-1];
3294 port->cm_dev = cm_dev;
3295 port->port_num = i;
3296 port->mad_agent = ib_register_mad_agent(device, i,
3297 IB_QPT_GSI,
3298 &reg_req,
3299 0,
3300 cm_send_handler,
3301 cm_recv_handler,
3302 port);
3303 if (IS_ERR(port->mad_agent))
3304 goto error1;
3305
3306 ret = ib_modify_port(device, i, 0, &port_modify);
3307 if (ret)
3308 goto error2;
3309 }
3310 ib_set_client_data(device, &cm_client, cm_dev);
3311
3312 write_lock_irqsave(&cm.device_lock, flags);
3313 list_add_tail(&cm_dev->list, &cm.device_list);
3314 write_unlock_irqrestore(&cm.device_lock, flags);
3315 return;
3316
3317 error2:
3318 ib_unregister_mad_agent(port->mad_agent);
3319 error1:
3320 port_modify.set_port_cap_mask = 0;
3321 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3322 while (--i) {
3323 port = &cm_dev->port[i-1];
3324 ib_modify_port(device, port->port_num, 0, &port_modify);
3325 ib_unregister_mad_agent(port->mad_agent);
3326 }
3327 kfree(cm_dev);
3328 }
3329
3330 static void cm_remove_one(struct ib_device *device)
3331 {
3332 struct cm_device *cm_dev;
3333 struct cm_port *port;
3334 struct ib_port_modify port_modify = {
3335 .clr_port_cap_mask = IB_PORT_CM_SUP
3336 };
3337 unsigned long flags;
3338 int i;
3339
3340 cm_dev = ib_get_client_data(device, &cm_client);
3341 if (!cm_dev)
3342 return;
3343
3344 write_lock_irqsave(&cm.device_lock, flags);
3345 list_del(&cm_dev->list);
3346 write_unlock_irqrestore(&cm.device_lock, flags);
3347
3348 for (i = 1; i <= device->phys_port_cnt; i++) {
3349 port = &cm_dev->port[i-1];
3350 ib_modify_port(device, port->port_num, 0, &port_modify);
3351 ib_unregister_mad_agent(port->mad_agent);
3352 }
3353 kfree(cm_dev);
3354 }
3355
3356 static int __init ib_cm_init(void)
3357 {
3358 int ret;
3359
3360 memset(&cm, 0, sizeof cm);
3361 INIT_LIST_HEAD(&cm.device_list);
3362 rwlock_init(&cm.device_lock);
3363 spin_lock_init(&cm.lock);
3364 cm.listen_service_table = RB_ROOT;
3365 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3366 cm.remote_id_table = RB_ROOT;
3367 cm.remote_qp_table = RB_ROOT;
3368 cm.remote_sidr_table = RB_ROOT;
3369 idr_init(&cm.local_id_table);
3370 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3371 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3372
3373 cm.wq = create_workqueue("ib_cm");
3374 if (!cm.wq)
3375 return -ENOMEM;
3376
3377 ret = ib_register_client(&cm_client);
3378 if (ret)
3379 goto error;
3380
3381 return 0;
3382 error:
3383 destroy_workqueue(cm.wq);
3384 return ret;
3385 }
3386
3387 static void __exit ib_cm_cleanup(void)
3388 {
3389 destroy_workqueue(cm.wq);
3390 ib_unregister_client(&cm_client);
3391 idr_destroy(&cm.local_id_table);
3392 }
3393
3394 module_init(ib_cm_init);
3395 module_exit(ib_cm_cleanup);
3396
Linux kernel - Deliverables
This page took 0.101536 seconds and 6 git commands to generate.