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IB/cm: Fix timewait crash after module unload
[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 list_head timewait_list;
79 struct workqueue_struct *wq;
80 } cm;
81
82 struct cm_port {
83 struct cm_device *cm_dev;
84 struct ib_mad_agent *mad_agent;
85 u8 port_num;
86 };
87
88 struct cm_device {
89 struct list_head list;
90 struct ib_device *device;
91 __be64 ca_guid;
92 struct cm_port port[0];
93 };
94
95 struct cm_av {
96 struct cm_port *port;
97 union ib_gid dgid;
98 struct ib_ah_attr ah_attr;
99 u16 pkey_index;
100 u8 packet_life_time;
101 };
102
103 struct cm_work {
104 struct work_struct work;
105 struct list_head list;
106 struct cm_port *port;
107 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
108 __be32 local_id; /* Established / timewait */
109 __be32 remote_id;
110 struct ib_cm_event cm_event;
111 struct ib_sa_path_rec path[0];
112 };
113
114 struct cm_timewait_info {
115 struct cm_work work; /* Must be first. */
116 struct list_head list;
117 struct rb_node remote_qp_node;
118 struct rb_node remote_id_node;
119 __be64 remote_ca_guid;
120 __be32 remote_qpn;
121 u8 inserted_remote_qp;
122 u8 inserted_remote_id;
123 };
124
125 struct cm_id_private {
126 struct ib_cm_id id;
127
128 struct rb_node service_node;
129 struct rb_node sidr_id_node;
130 spinlock_t lock; /* Do not acquire inside cm.lock */
131 struct completion comp;
132 atomic_t refcount;
133
134 struct ib_mad_send_buf *msg;
135 struct cm_timewait_info *timewait_info;
136 /* todo: use alternate port on send failure */
137 struct cm_av av;
138 struct cm_av alt_av;
139 struct ib_cm_compare_data *compare_data;
140
141 void *private_data;
142 __be64 tid;
143 __be32 local_qpn;
144 __be32 remote_qpn;
145 enum ib_qp_type qp_type;
146 __be32 sq_psn;
147 __be32 rq_psn;
148 int timeout_ms;
149 enum ib_mtu path_mtu;
150 u8 private_data_len;
151 u8 max_cm_retries;
152 u8 peer_to_peer;
153 u8 responder_resources;
154 u8 initiator_depth;
155 u8 local_ack_timeout;
156 u8 retry_count;
157 u8 rnr_retry_count;
158 u8 service_timeout;
159
160 struct list_head work_list;
161 atomic_t work_count;
162 };
163
164 static void cm_work_handler(void *data);
165
166 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
167 {
168 if (atomic_dec_and_test(&cm_id_priv->refcount))
169 complete(&cm_id_priv->comp);
170 }
171
172 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
173 struct ib_mad_send_buf **msg)
174 {
175 struct ib_mad_agent *mad_agent;
176 struct ib_mad_send_buf *m;
177 struct ib_ah *ah;
178
179 mad_agent = cm_id_priv->av.port->mad_agent;
180 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
181 if (IS_ERR(ah))
182 return PTR_ERR(ah);
183
184 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
185 cm_id_priv->av.pkey_index,
186 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
187 GFP_ATOMIC);
188 if (IS_ERR(m)) {
189 ib_destroy_ah(ah);
190 return PTR_ERR(m);
191 }
192
193 /* Timeout set by caller if response is expected. */
194 m->ah = ah;
195 m->retries = cm_id_priv->max_cm_retries;
196
197 atomic_inc(&cm_id_priv->refcount);
198 m->context[0] = cm_id_priv;
199 *msg = m;
200 return 0;
201 }
202
203 static int cm_alloc_response_msg(struct cm_port *port,
204 struct ib_mad_recv_wc *mad_recv_wc,
205 struct ib_mad_send_buf **msg)
206 {
207 struct ib_mad_send_buf *m;
208 struct ib_ah *ah;
209
210 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
211 mad_recv_wc->recv_buf.grh, port->port_num);
212 if (IS_ERR(ah))
213 return PTR_ERR(ah);
214
215 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
216 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
217 GFP_ATOMIC);
218 if (IS_ERR(m)) {
219 ib_destroy_ah(ah);
220 return PTR_ERR(m);
221 }
222 m->ah = ah;
223 *msg = m;
224 return 0;
225 }
226
227 static void cm_free_msg(struct ib_mad_send_buf *msg)
228 {
229 ib_destroy_ah(msg->ah);
230 if (msg->context[0])
231 cm_deref_id(msg->context[0]);
232 ib_free_send_mad(msg);
233 }
234
235 static void * cm_copy_private_data(const void *private_data,
236 u8 private_data_len)
237 {
238 void *data;
239
240 if (!private_data || !private_data_len)
241 return NULL;
242
243 data = kmalloc(private_data_len, GFP_KERNEL);
244 if (!data)
245 return ERR_PTR(-ENOMEM);
246
247 memcpy(data, private_data, private_data_len);
248 return data;
249 }
250
251 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
252 void *private_data, u8 private_data_len)
253 {
254 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
255 kfree(cm_id_priv->private_data);
256
257 cm_id_priv->private_data = private_data;
258 cm_id_priv->private_data_len = private_data_len;
259 }
260
261 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
262 struct ib_grh *grh, struct cm_av *av)
263 {
264 av->port = port;
265 av->pkey_index = wc->pkey_index;
266 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
267 grh, &av->ah_attr);
268 }
269
270 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
271 {
272 struct cm_device *cm_dev;
273 struct cm_port *port = NULL;
274 unsigned long flags;
275 int ret;
276 u8 p;
277
278 read_lock_irqsave(&cm.device_lock, flags);
279 list_for_each_entry(cm_dev, &cm.device_list, list) {
280 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
281 &p, NULL)) {
282 port = &cm_dev->port[p-1];
283 break;
284 }
285 }
286 read_unlock_irqrestore(&cm.device_lock, flags);
287
288 if (!port)
289 return -EINVAL;
290
291 ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
292 be16_to_cpu(path->pkey), &av->pkey_index);
293 if (ret)
294 return ret;
295
296 av->port = port;
297 ib_init_ah_from_path(cm_dev->device, port->port_num, path,
298 &av->ah_attr);
299 av->packet_life_time = path->packet_life_time;
300 return 0;
301 }
302
303 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
304 {
305 unsigned long flags;
306 int ret, id;
307 static int next_id;
308
309 do {
310 spin_lock_irqsave(&cm.lock, flags);
311 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
312 next_id++, &id);
313 spin_unlock_irqrestore(&cm.lock, flags);
314 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
315
316 cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
317 return ret;
318 }
319
320 static void cm_free_id(__be32 local_id)
321 {
322 unsigned long flags;
323
324 spin_lock_irqsave(&cm.lock, flags);
325 idr_remove(&cm.local_id_table,
326 (__force int) (local_id ^ cm.random_id_operand));
327 spin_unlock_irqrestore(&cm.lock, flags);
328 }
329
330 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
331 {
332 struct cm_id_private *cm_id_priv;
333
334 cm_id_priv = idr_find(&cm.local_id_table,
335 (__force int) (local_id ^ cm.random_id_operand));
336 if (cm_id_priv) {
337 if (cm_id_priv->id.remote_id == remote_id)
338 atomic_inc(&cm_id_priv->refcount);
339 else
340 cm_id_priv = NULL;
341 }
342
343 return cm_id_priv;
344 }
345
346 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
347 {
348 struct cm_id_private *cm_id_priv;
349 unsigned long flags;
350
351 spin_lock_irqsave(&cm.lock, flags);
352 cm_id_priv = cm_get_id(local_id, remote_id);
353 spin_unlock_irqrestore(&cm.lock, flags);
354
355 return cm_id_priv;
356 }
357
358 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
359 {
360 int i;
361
362 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
363 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
364 ((unsigned long *) mask)[i];
365 }
366
367 static int cm_compare_data(struct ib_cm_compare_data *src_data,
368 struct ib_cm_compare_data *dst_data)
369 {
370 u8 src[IB_CM_COMPARE_SIZE];
371 u8 dst[IB_CM_COMPARE_SIZE];
372
373 if (!src_data || !dst_data)
374 return 0;
375
376 cm_mask_copy(src, src_data->data, dst_data->mask);
377 cm_mask_copy(dst, dst_data->data, src_data->mask);
378 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
379 }
380
381 static int cm_compare_private_data(u8 *private_data,
382 struct ib_cm_compare_data *dst_data)
383 {
384 u8 src[IB_CM_COMPARE_SIZE];
385
386 if (!dst_data)
387 return 0;
388
389 cm_mask_copy(src, private_data, dst_data->mask);
390 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
391 }
392
393 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
394 {
395 struct rb_node **link = &cm.listen_service_table.rb_node;
396 struct rb_node *parent = NULL;
397 struct cm_id_private *cur_cm_id_priv;
398 __be64 service_id = cm_id_priv->id.service_id;
399 __be64 service_mask = cm_id_priv->id.service_mask;
400 int data_cmp;
401
402 while (*link) {
403 parent = *link;
404 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
405 service_node);
406 data_cmp = cm_compare_data(cm_id_priv->compare_data,
407 cur_cm_id_priv->compare_data);
408 if ((cur_cm_id_priv->id.service_mask & service_id) ==
409 (service_mask & cur_cm_id_priv->id.service_id) &&
410 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
411 !data_cmp)
412 return cur_cm_id_priv;
413
414 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
415 link = &(*link)->rb_left;
416 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
417 link = &(*link)->rb_right;
418 else if (service_id < cur_cm_id_priv->id.service_id)
419 link = &(*link)->rb_left;
420 else if (service_id > cur_cm_id_priv->id.service_id)
421 link = &(*link)->rb_right;
422 else if (data_cmp < 0)
423 link = &(*link)->rb_left;
424 else
425 link = &(*link)->rb_right;
426 }
427 rb_link_node(&cm_id_priv->service_node, parent, link);
428 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
429 return NULL;
430 }
431
432 static struct cm_id_private * cm_find_listen(struct ib_device *device,
433 __be64 service_id,
434 u8 *private_data)
435 {
436 struct rb_node *node = cm.listen_service_table.rb_node;
437 struct cm_id_private *cm_id_priv;
438 int data_cmp;
439
440 while (node) {
441 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
442 data_cmp = cm_compare_private_data(private_data,
443 cm_id_priv->compare_data);
444 if ((cm_id_priv->id.service_mask & service_id) ==
445 cm_id_priv->id.service_id &&
446 (cm_id_priv->id.device == device) && !data_cmp)
447 return cm_id_priv;
448
449 if (device < cm_id_priv->id.device)
450 node = node->rb_left;
451 else if (device > cm_id_priv->id.device)
452 node = node->rb_right;
453 else if (service_id < cm_id_priv->id.service_id)
454 node = node->rb_left;
455 else if (service_id > cm_id_priv->id.service_id)
456 node = node->rb_right;
457 else if (data_cmp < 0)
458 node = node->rb_left;
459 else
460 node = node->rb_right;
461 }
462 return NULL;
463 }
464
465 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
466 *timewait_info)
467 {
468 struct rb_node **link = &cm.remote_id_table.rb_node;
469 struct rb_node *parent = NULL;
470 struct cm_timewait_info *cur_timewait_info;
471 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
472 __be32 remote_id = timewait_info->work.remote_id;
473
474 while (*link) {
475 parent = *link;
476 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
477 remote_id_node);
478 if (remote_id < cur_timewait_info->work.remote_id)
479 link = &(*link)->rb_left;
480 else if (remote_id > cur_timewait_info->work.remote_id)
481 link = &(*link)->rb_right;
482 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
483 link = &(*link)->rb_left;
484 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
485 link = &(*link)->rb_right;
486 else
487 return cur_timewait_info;
488 }
489 timewait_info->inserted_remote_id = 1;
490 rb_link_node(&timewait_info->remote_id_node, parent, link);
491 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
492 return NULL;
493 }
494
495 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
496 __be32 remote_id)
497 {
498 struct rb_node *node = cm.remote_id_table.rb_node;
499 struct cm_timewait_info *timewait_info;
500
501 while (node) {
502 timewait_info = rb_entry(node, struct cm_timewait_info,
503 remote_id_node);
504 if (remote_id < timewait_info->work.remote_id)
505 node = node->rb_left;
506 else if (remote_id > timewait_info->work.remote_id)
507 node = node->rb_right;
508 else if (remote_ca_guid < timewait_info->remote_ca_guid)
509 node = node->rb_left;
510 else if (remote_ca_guid > timewait_info->remote_ca_guid)
511 node = node->rb_right;
512 else
513 return timewait_info;
514 }
515 return NULL;
516 }
517
518 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
519 *timewait_info)
520 {
521 struct rb_node **link = &cm.remote_qp_table.rb_node;
522 struct rb_node *parent = NULL;
523 struct cm_timewait_info *cur_timewait_info;
524 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
525 __be32 remote_qpn = timewait_info->remote_qpn;
526
527 while (*link) {
528 parent = *link;
529 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
530 remote_qp_node);
531 if (remote_qpn < cur_timewait_info->remote_qpn)
532 link = &(*link)->rb_left;
533 else if (remote_qpn > cur_timewait_info->remote_qpn)
534 link = &(*link)->rb_right;
535 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
536 link = &(*link)->rb_left;
537 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
538 link = &(*link)->rb_right;
539 else
540 return cur_timewait_info;
541 }
542 timewait_info->inserted_remote_qp = 1;
543 rb_link_node(&timewait_info->remote_qp_node, parent, link);
544 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
545 return NULL;
546 }
547
548 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
549 *cm_id_priv)
550 {
551 struct rb_node **link = &cm.remote_sidr_table.rb_node;
552 struct rb_node *parent = NULL;
553 struct cm_id_private *cur_cm_id_priv;
554 union ib_gid *port_gid = &cm_id_priv->av.dgid;
555 __be32 remote_id = cm_id_priv->id.remote_id;
556
557 while (*link) {
558 parent = *link;
559 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
560 sidr_id_node);
561 if (remote_id < cur_cm_id_priv->id.remote_id)
562 link = &(*link)->rb_left;
563 else if (remote_id > cur_cm_id_priv->id.remote_id)
564 link = &(*link)->rb_right;
565 else {
566 int cmp;
567 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
568 sizeof *port_gid);
569 if (cmp < 0)
570 link = &(*link)->rb_left;
571 else if (cmp > 0)
572 link = &(*link)->rb_right;
573 else
574 return cur_cm_id_priv;
575 }
576 }
577 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
578 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
579 return NULL;
580 }
581
582 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
583 enum ib_cm_sidr_status status)
584 {
585 struct ib_cm_sidr_rep_param param;
586
587 memset(&param, 0, sizeof param);
588 param.status = status;
589 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
590 }
591
592 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
593 ib_cm_handler cm_handler,
594 void *context)
595 {
596 struct cm_id_private *cm_id_priv;
597 int ret;
598
599 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
600 if (!cm_id_priv)
601 return ERR_PTR(-ENOMEM);
602
603 cm_id_priv->id.state = IB_CM_IDLE;
604 cm_id_priv->id.device = device;
605 cm_id_priv->id.cm_handler = cm_handler;
606 cm_id_priv->id.context = context;
607 cm_id_priv->id.remote_cm_qpn = 1;
608 ret = cm_alloc_id(cm_id_priv);
609 if (ret)
610 goto error;
611
612 spin_lock_init(&cm_id_priv->lock);
613 init_completion(&cm_id_priv->comp);
614 INIT_LIST_HEAD(&cm_id_priv->work_list);
615 atomic_set(&cm_id_priv->work_count, -1);
616 atomic_set(&cm_id_priv->refcount, 1);
617 return &cm_id_priv->id;
618
619 error:
620 kfree(cm_id_priv);
621 return ERR_PTR(-ENOMEM);
622 }
623 EXPORT_SYMBOL(ib_create_cm_id);
624
625 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
626 {
627 struct cm_work *work;
628
629 if (list_empty(&cm_id_priv->work_list))
630 return NULL;
631
632 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
633 list_del(&work->list);
634 return work;
635 }
636
637 static void cm_free_work(struct cm_work *work)
638 {
639 if (work->mad_recv_wc)
640 ib_free_recv_mad(work->mad_recv_wc);
641 kfree(work);
642 }
643
644 static inline int cm_convert_to_ms(int iba_time)
645 {
646 /* approximate conversion to ms from 4.096us x 2^iba_time */
647 return 1 << max(iba_time - 8, 0);
648 }
649
650 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
651 {
652 if (timewait_info->inserted_remote_id) {
653 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
654 timewait_info->inserted_remote_id = 0;
655 }
656
657 if (timewait_info->inserted_remote_qp) {
658 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
659 timewait_info->inserted_remote_qp = 0;
660 }
661 }
662
663 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
664 {
665 struct cm_timewait_info *timewait_info;
666
667 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
668 if (!timewait_info)
669 return ERR_PTR(-ENOMEM);
670
671 timewait_info->work.local_id = local_id;
672 INIT_WORK(&timewait_info->work.work, cm_work_handler,
673 &timewait_info->work);
674 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
675 return timewait_info;
676 }
677
678 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
679 {
680 int wait_time;
681 unsigned long flags;
682
683 spin_lock_irqsave(&cm.lock, flags);
684 cm_cleanup_timewait(cm_id_priv->timewait_info);
685 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
686 spin_unlock_irqrestore(&cm.lock, flags);
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 unsigned long flags;
703
704 cm_id_priv->id.state = IB_CM_IDLE;
705 if (cm_id_priv->timewait_info) {
706 spin_lock_irqsave(&cm.lock, flags);
707 cm_cleanup_timewait(cm_id_priv->timewait_info);
708 spin_unlock_irqrestore(&cm.lock, flags);
709 kfree(cm_id_priv->timewait_info);
710 cm_id_priv->timewait_info = NULL;
711 }
712 }
713
714 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
715 {
716 struct cm_id_private *cm_id_priv;
717 struct cm_work *work;
718 unsigned long flags;
719
720 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
721 retest:
722 spin_lock_irqsave(&cm_id_priv->lock, flags);
723 switch (cm_id->state) {
724 case IB_CM_LISTEN:
725 cm_id->state = IB_CM_IDLE;
726 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
727 spin_lock_irqsave(&cm.lock, flags);
728 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
729 spin_unlock_irqrestore(&cm.lock, flags);
730 break;
731 case IB_CM_SIDR_REQ_SENT:
732 cm_id->state = IB_CM_IDLE;
733 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
734 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
735 break;
736 case IB_CM_SIDR_REQ_RCVD:
737 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
738 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
739 break;
740 case IB_CM_REQ_SENT:
741 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
742 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
743 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
744 &cm_id_priv->av.port->cm_dev->ca_guid,
745 sizeof cm_id_priv->av.port->cm_dev->ca_guid,
746 NULL, 0);
747 break;
748 case IB_CM_REQ_RCVD:
749 if (err == -ENOMEM) {
750 /* Do not reject to allow future retries. */
751 cm_reset_to_idle(cm_id_priv);
752 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
753 } else {
754 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
755 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
756 NULL, 0, NULL, 0);
757 }
758 break;
759 case IB_CM_MRA_REQ_RCVD:
760 case IB_CM_REP_SENT:
761 case IB_CM_MRA_REP_RCVD:
762 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
763 /* Fall through */
764 case IB_CM_MRA_REQ_SENT:
765 case IB_CM_REP_RCVD:
766 case IB_CM_MRA_REP_SENT:
767 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
768 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
769 NULL, 0, NULL, 0);
770 break;
771 case IB_CM_ESTABLISHED:
772 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
773 ib_send_cm_dreq(cm_id, NULL, 0);
774 goto retest;
775 case IB_CM_DREQ_SENT:
776 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
777 cm_enter_timewait(cm_id_priv);
778 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
779 break;
780 case IB_CM_DREQ_RCVD:
781 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
782 ib_send_cm_drep(cm_id, NULL, 0);
783 break;
784 default:
785 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
786 break;
787 }
788
789 cm_free_id(cm_id->local_id);
790 cm_deref_id(cm_id_priv);
791 wait_for_completion(&cm_id_priv->comp);
792 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
793 cm_free_work(work);
794 kfree(cm_id_priv->compare_data);
795 kfree(cm_id_priv->private_data);
796 kfree(cm_id_priv);
797 }
798
799 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
800 {
801 cm_destroy_id(cm_id, 0);
802 }
803 EXPORT_SYMBOL(ib_destroy_cm_id);
804
805 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
806 struct ib_cm_compare_data *compare_data)
807 {
808 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
809 unsigned long flags;
810 int ret = 0;
811
812 service_mask = service_mask ? service_mask :
813 __constant_cpu_to_be64(~0ULL);
814 service_id &= service_mask;
815 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
816 (service_id != IB_CM_ASSIGN_SERVICE_ID))
817 return -EINVAL;
818
819 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
820 if (cm_id->state != IB_CM_IDLE)
821 return -EINVAL;
822
823 if (compare_data) {
824 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
825 GFP_KERNEL);
826 if (!cm_id_priv->compare_data)
827 return -ENOMEM;
828 cm_mask_copy(cm_id_priv->compare_data->data,
829 compare_data->data, compare_data->mask);
830 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
831 IB_CM_COMPARE_SIZE);
832 }
833
834 cm_id->state = IB_CM_LISTEN;
835
836 spin_lock_irqsave(&cm.lock, flags);
837 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
838 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
839 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
840 } else {
841 cm_id->service_id = service_id;
842 cm_id->service_mask = service_mask;
843 }
844 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
845 spin_unlock_irqrestore(&cm.lock, flags);
846
847 if (cur_cm_id_priv) {
848 cm_id->state = IB_CM_IDLE;
849 kfree(cm_id_priv->compare_data);
850 cm_id_priv->compare_data = NULL;
851 ret = -EBUSY;
852 }
853 return ret;
854 }
855 EXPORT_SYMBOL(ib_cm_listen);
856
857 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
858 enum cm_msg_sequence msg_seq)
859 {
860 u64 hi_tid, low_tid;
861
862 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
863 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
864 (msg_seq << 30));
865 return cpu_to_be64(hi_tid | low_tid);
866 }
867
868 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
869 __be16 attr_id, __be64 tid)
870 {
871 hdr->base_version = IB_MGMT_BASE_VERSION;
872 hdr->mgmt_class = IB_MGMT_CLASS_CM;
873 hdr->class_version = IB_CM_CLASS_VERSION;
874 hdr->method = IB_MGMT_METHOD_SEND;
875 hdr->attr_id = attr_id;
876 hdr->tid = tid;
877 }
878
879 static void cm_format_req(struct cm_req_msg *req_msg,
880 struct cm_id_private *cm_id_priv,
881 struct ib_cm_req_param *param)
882 {
883 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
884 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
885
886 req_msg->local_comm_id = cm_id_priv->id.local_id;
887 req_msg->service_id = param->service_id;
888 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
889 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
890 cm_req_set_resp_res(req_msg, param->responder_resources);
891 cm_req_set_init_depth(req_msg, param->initiator_depth);
892 cm_req_set_remote_resp_timeout(req_msg,
893 param->remote_cm_response_timeout);
894 cm_req_set_qp_type(req_msg, param->qp_type);
895 cm_req_set_flow_ctrl(req_msg, param->flow_control);
896 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
897 cm_req_set_local_resp_timeout(req_msg,
898 param->local_cm_response_timeout);
899 cm_req_set_retry_count(req_msg, param->retry_count);
900 req_msg->pkey = param->primary_path->pkey;
901 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
902 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
903 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
904 cm_req_set_srq(req_msg, param->srq);
905
906 req_msg->primary_local_lid = param->primary_path->slid;
907 req_msg->primary_remote_lid = param->primary_path->dlid;
908 req_msg->primary_local_gid = param->primary_path->sgid;
909 req_msg->primary_remote_gid = param->primary_path->dgid;
910 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
911 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
912 req_msg->primary_traffic_class = param->primary_path->traffic_class;
913 req_msg->primary_hop_limit = param->primary_path->hop_limit;
914 cm_req_set_primary_sl(req_msg, param->primary_path->sl);
915 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
916 cm_req_set_primary_local_ack_timeout(req_msg,
917 min(31, param->primary_path->packet_life_time + 1));
918
919 if (param->alternate_path) {
920 req_msg->alt_local_lid = param->alternate_path->slid;
921 req_msg->alt_remote_lid = param->alternate_path->dlid;
922 req_msg->alt_local_gid = param->alternate_path->sgid;
923 req_msg->alt_remote_gid = param->alternate_path->dgid;
924 cm_req_set_alt_flow_label(req_msg,
925 param->alternate_path->flow_label);
926 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
927 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
928 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
929 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
930 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
931 cm_req_set_alt_local_ack_timeout(req_msg,
932 min(31, param->alternate_path->packet_life_time + 1));
933 }
934
935 if (param->private_data && param->private_data_len)
936 memcpy(req_msg->private_data, param->private_data,
937 param->private_data_len);
938 }
939
940 static int cm_validate_req_param(struct ib_cm_req_param *param)
941 {
942 /* peer-to-peer not supported */
943 if (param->peer_to_peer)
944 return -EINVAL;
945
946 if (!param->primary_path)
947 return -EINVAL;
948
949 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
950 return -EINVAL;
951
952 if (param->private_data &&
953 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
954 return -EINVAL;
955
956 if (param->alternate_path &&
957 (param->alternate_path->pkey != param->primary_path->pkey ||
958 param->alternate_path->mtu != param->primary_path->mtu))
959 return -EINVAL;
960
961 return 0;
962 }
963
964 int ib_send_cm_req(struct ib_cm_id *cm_id,
965 struct ib_cm_req_param *param)
966 {
967 struct cm_id_private *cm_id_priv;
968 struct cm_req_msg *req_msg;
969 unsigned long flags;
970 int ret;
971
972 ret = cm_validate_req_param(param);
973 if (ret)
974 return ret;
975
976 /* Verify that we're not in timewait. */
977 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
978 spin_lock_irqsave(&cm_id_priv->lock, flags);
979 if (cm_id->state != IB_CM_IDLE) {
980 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
981 ret = -EINVAL;
982 goto out;
983 }
984 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
985
986 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
987 id.local_id);
988 if (IS_ERR(cm_id_priv->timewait_info)) {
989 ret = PTR_ERR(cm_id_priv->timewait_info);
990 goto out;
991 }
992
993 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
994 if (ret)
995 goto error1;
996 if (param->alternate_path) {
997 ret = cm_init_av_by_path(param->alternate_path,
998 &cm_id_priv->alt_av);
999 if (ret)
1000 goto error1;
1001 }
1002 cm_id->service_id = param->service_id;
1003 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
1004 cm_id_priv->timeout_ms = cm_convert_to_ms(
1005 param->primary_path->packet_life_time) * 2 +
1006 cm_convert_to_ms(
1007 param->remote_cm_response_timeout);
1008 cm_id_priv->max_cm_retries = param->max_cm_retries;
1009 cm_id_priv->initiator_depth = param->initiator_depth;
1010 cm_id_priv->responder_resources = param->responder_resources;
1011 cm_id_priv->retry_count = param->retry_count;
1012 cm_id_priv->path_mtu = param->primary_path->mtu;
1013 cm_id_priv->qp_type = param->qp_type;
1014
1015 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1016 if (ret)
1017 goto error1;
1018
1019 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1020 cm_format_req(req_msg, cm_id_priv, param);
1021 cm_id_priv->tid = req_msg->hdr.tid;
1022 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1023 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1024
1025 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1026 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1027 cm_id_priv->local_ack_timeout =
1028 cm_req_get_primary_local_ack_timeout(req_msg);
1029
1030 spin_lock_irqsave(&cm_id_priv->lock, flags);
1031 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1032 if (ret) {
1033 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1034 goto error2;
1035 }
1036 BUG_ON(cm_id->state != IB_CM_IDLE);
1037 cm_id->state = IB_CM_REQ_SENT;
1038 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1039 return 0;
1040
1041 error2: cm_free_msg(cm_id_priv->msg);
1042 error1: kfree(cm_id_priv->timewait_info);
1043 out: return ret;
1044 }
1045 EXPORT_SYMBOL(ib_send_cm_req);
1046
1047 static int cm_issue_rej(struct cm_port *port,
1048 struct ib_mad_recv_wc *mad_recv_wc,
1049 enum ib_cm_rej_reason reason,
1050 enum cm_msg_response msg_rejected,
1051 void *ari, u8 ari_length)
1052 {
1053 struct ib_mad_send_buf *msg = NULL;
1054 struct cm_rej_msg *rej_msg, *rcv_msg;
1055 int ret;
1056
1057 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1058 if (ret)
1059 return ret;
1060
1061 /* We just need common CM header information. Cast to any message. */
1062 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1063 rej_msg = (struct cm_rej_msg *) msg->mad;
1064
1065 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1066 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1067 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1068 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1069 rej_msg->reason = cpu_to_be16(reason);
1070
1071 if (ari && ari_length) {
1072 cm_rej_set_reject_info_len(rej_msg, ari_length);
1073 memcpy(rej_msg->ari, ari, ari_length);
1074 }
1075
1076 ret = ib_post_send_mad(msg, NULL);
1077 if (ret)
1078 cm_free_msg(msg);
1079
1080 return ret;
1081 }
1082
1083 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1084 __be32 local_qpn, __be32 remote_qpn)
1085 {
1086 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1087 ((local_ca_guid == remote_ca_guid) &&
1088 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1089 }
1090
1091 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1092 struct ib_sa_path_rec *primary_path,
1093 struct ib_sa_path_rec *alt_path)
1094 {
1095 memset(primary_path, 0, sizeof *primary_path);
1096 primary_path->dgid = req_msg->primary_local_gid;
1097 primary_path->sgid = req_msg->primary_remote_gid;
1098 primary_path->dlid = req_msg->primary_local_lid;
1099 primary_path->slid = req_msg->primary_remote_lid;
1100 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1101 primary_path->hop_limit = req_msg->primary_hop_limit;
1102 primary_path->traffic_class = req_msg->primary_traffic_class;
1103 primary_path->reversible = 1;
1104 primary_path->pkey = req_msg->pkey;
1105 primary_path->sl = cm_req_get_primary_sl(req_msg);
1106 primary_path->mtu_selector = IB_SA_EQ;
1107 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1108 primary_path->rate_selector = IB_SA_EQ;
1109 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1110 primary_path->packet_life_time_selector = IB_SA_EQ;
1111 primary_path->packet_life_time =
1112 cm_req_get_primary_local_ack_timeout(req_msg);
1113 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1114
1115 if (req_msg->alt_local_lid) {
1116 memset(alt_path, 0, sizeof *alt_path);
1117 alt_path->dgid = req_msg->alt_local_gid;
1118 alt_path->sgid = req_msg->alt_remote_gid;
1119 alt_path->dlid = req_msg->alt_local_lid;
1120 alt_path->slid = req_msg->alt_remote_lid;
1121 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1122 alt_path->hop_limit = req_msg->alt_hop_limit;
1123 alt_path->traffic_class = req_msg->alt_traffic_class;
1124 alt_path->reversible = 1;
1125 alt_path->pkey = req_msg->pkey;
1126 alt_path->sl = cm_req_get_alt_sl(req_msg);
1127 alt_path->mtu_selector = IB_SA_EQ;
1128 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1129 alt_path->rate_selector = IB_SA_EQ;
1130 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1131 alt_path->packet_life_time_selector = IB_SA_EQ;
1132 alt_path->packet_life_time =
1133 cm_req_get_alt_local_ack_timeout(req_msg);
1134 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1135 }
1136 }
1137
1138 static void cm_format_req_event(struct cm_work *work,
1139 struct cm_id_private *cm_id_priv,
1140 struct ib_cm_id *listen_id)
1141 {
1142 struct cm_req_msg *req_msg;
1143 struct ib_cm_req_event_param *param;
1144
1145 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1146 param = &work->cm_event.param.req_rcvd;
1147 param->listen_id = listen_id;
1148 param->port = cm_id_priv->av.port->port_num;
1149 param->primary_path = &work->path[0];
1150 if (req_msg->alt_local_lid)
1151 param->alternate_path = &work->path[1];
1152 else
1153 param->alternate_path = NULL;
1154 param->remote_ca_guid = req_msg->local_ca_guid;
1155 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1156 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1157 param->qp_type = cm_req_get_qp_type(req_msg);
1158 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1159 param->responder_resources = cm_req_get_init_depth(req_msg);
1160 param->initiator_depth = cm_req_get_resp_res(req_msg);
1161 param->local_cm_response_timeout =
1162 cm_req_get_remote_resp_timeout(req_msg);
1163 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1164 param->remote_cm_response_timeout =
1165 cm_req_get_local_resp_timeout(req_msg);
1166 param->retry_count = cm_req_get_retry_count(req_msg);
1167 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1168 param->srq = cm_req_get_srq(req_msg);
1169 work->cm_event.private_data = &req_msg->private_data;
1170 }
1171
1172 static void cm_process_work(struct cm_id_private *cm_id_priv,
1173 struct cm_work *work)
1174 {
1175 unsigned long flags;
1176 int ret;
1177
1178 /* We will typically only have the current event to report. */
1179 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1180 cm_free_work(work);
1181
1182 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1183 spin_lock_irqsave(&cm_id_priv->lock, flags);
1184 work = cm_dequeue_work(cm_id_priv);
1185 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1186 BUG_ON(!work);
1187 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1188 &work->cm_event);
1189 cm_free_work(work);
1190 }
1191 cm_deref_id(cm_id_priv);
1192 if (ret)
1193 cm_destroy_id(&cm_id_priv->id, ret);
1194 }
1195
1196 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1197 struct cm_id_private *cm_id_priv,
1198 enum cm_msg_response msg_mraed, u8 service_timeout,
1199 const void *private_data, u8 private_data_len)
1200 {
1201 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1202 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1203 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1204 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1205 cm_mra_set_service_timeout(mra_msg, service_timeout);
1206
1207 if (private_data && private_data_len)
1208 memcpy(mra_msg->private_data, private_data, private_data_len);
1209 }
1210
1211 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1212 struct cm_id_private *cm_id_priv,
1213 enum ib_cm_rej_reason reason,
1214 void *ari,
1215 u8 ari_length,
1216 const void *private_data,
1217 u8 private_data_len)
1218 {
1219 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1220 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1221
1222 switch(cm_id_priv->id.state) {
1223 case IB_CM_REQ_RCVD:
1224 rej_msg->local_comm_id = 0;
1225 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1226 break;
1227 case IB_CM_MRA_REQ_SENT:
1228 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1229 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1230 break;
1231 case IB_CM_REP_RCVD:
1232 case IB_CM_MRA_REP_SENT:
1233 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1234 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1235 break;
1236 default:
1237 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1238 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1239 break;
1240 }
1241
1242 rej_msg->reason = cpu_to_be16(reason);
1243 if (ari && ari_length) {
1244 cm_rej_set_reject_info_len(rej_msg, ari_length);
1245 memcpy(rej_msg->ari, ari, ari_length);
1246 }
1247
1248 if (private_data && private_data_len)
1249 memcpy(rej_msg->private_data, private_data, private_data_len);
1250 }
1251
1252 static void cm_dup_req_handler(struct cm_work *work,
1253 struct cm_id_private *cm_id_priv)
1254 {
1255 struct ib_mad_send_buf *msg = NULL;
1256 unsigned long flags;
1257 int ret;
1258
1259 /* Quick state check to discard duplicate REQs. */
1260 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1261 return;
1262
1263 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1264 if (ret)
1265 return;
1266
1267 spin_lock_irqsave(&cm_id_priv->lock, flags);
1268 switch (cm_id_priv->id.state) {
1269 case IB_CM_MRA_REQ_SENT:
1270 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1271 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1272 cm_id_priv->private_data,
1273 cm_id_priv->private_data_len);
1274 break;
1275 case IB_CM_TIMEWAIT:
1276 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1277 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1278 break;
1279 default:
1280 goto unlock;
1281 }
1282 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1283
1284 ret = ib_post_send_mad(msg, NULL);
1285 if (ret)
1286 goto free;
1287 return;
1288
1289 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1290 free: cm_free_msg(msg);
1291 }
1292
1293 static struct cm_id_private * cm_match_req(struct cm_work *work,
1294 struct cm_id_private *cm_id_priv)
1295 {
1296 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1297 struct cm_timewait_info *timewait_info;
1298 struct cm_req_msg *req_msg;
1299 unsigned long flags;
1300
1301 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1302
1303 /* Check for duplicate REQ and stale connections. */
1304 spin_lock_irqsave(&cm.lock, flags);
1305 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1306 if (!timewait_info)
1307 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1308
1309 if (timewait_info) {
1310 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1311 timewait_info->work.remote_id);
1312 cm_cleanup_timewait(cm_id_priv->timewait_info);
1313 spin_unlock_irqrestore(&cm.lock, flags);
1314 if (cur_cm_id_priv) {
1315 cm_dup_req_handler(work, cur_cm_id_priv);
1316 cm_deref_id(cur_cm_id_priv);
1317 } else
1318 cm_issue_rej(work->port, work->mad_recv_wc,
1319 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1320 NULL, 0);
1321 listen_cm_id_priv = NULL;
1322 goto out;
1323 }
1324
1325 /* Find matching listen request. */
1326 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1327 req_msg->service_id,
1328 req_msg->private_data);
1329 if (!listen_cm_id_priv) {
1330 cm_cleanup_timewait(cm_id_priv->timewait_info);
1331 spin_unlock_irqrestore(&cm.lock, flags);
1332 cm_issue_rej(work->port, work->mad_recv_wc,
1333 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1334 NULL, 0);
1335 goto out;
1336 }
1337 atomic_inc(&listen_cm_id_priv->refcount);
1338 atomic_inc(&cm_id_priv->refcount);
1339 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1340 atomic_inc(&cm_id_priv->work_count);
1341 spin_unlock_irqrestore(&cm.lock, flags);
1342 out:
1343 return listen_cm_id_priv;
1344 }
1345
1346 static int cm_req_handler(struct cm_work *work)
1347 {
1348 struct ib_cm_id *cm_id;
1349 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1350 struct cm_req_msg *req_msg;
1351 int ret;
1352
1353 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1354
1355 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
1356 if (IS_ERR(cm_id))
1357 return PTR_ERR(cm_id);
1358
1359 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1360 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1361 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1362 work->mad_recv_wc->recv_buf.grh,
1363 &cm_id_priv->av);
1364 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1365 id.local_id);
1366 if (IS_ERR(cm_id_priv->timewait_info)) {
1367 ret = PTR_ERR(cm_id_priv->timewait_info);
1368 goto destroy;
1369 }
1370 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1371 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1372 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1373
1374 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1375 if (!listen_cm_id_priv) {
1376 ret = -EINVAL;
1377 kfree(cm_id_priv->timewait_info);
1378 goto destroy;
1379 }
1380
1381 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1382 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1383 cm_id_priv->id.service_id = req_msg->service_id;
1384 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
1385
1386 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1387 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1388 if (ret) {
1389 ib_get_cached_gid(work->port->cm_dev->device,
1390 work->port->port_num, 0, &work->path[0].sgid);
1391 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1392 &work->path[0].sgid, sizeof work->path[0].sgid,
1393 NULL, 0);
1394 goto rejected;
1395 }
1396 if (req_msg->alt_local_lid) {
1397 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1398 if (ret) {
1399 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1400 &work->path[0].sgid,
1401 sizeof work->path[0].sgid, NULL, 0);
1402 goto rejected;
1403 }
1404 }
1405 cm_id_priv->tid = req_msg->hdr.tid;
1406 cm_id_priv->timeout_ms = cm_convert_to_ms(
1407 cm_req_get_local_resp_timeout(req_msg));
1408 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1409 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1410 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1411 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1412 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1413 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1414 cm_id_priv->local_ack_timeout =
1415 cm_req_get_primary_local_ack_timeout(req_msg);
1416 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1417 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1418 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1419
1420 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1421 cm_process_work(cm_id_priv, work);
1422 cm_deref_id(listen_cm_id_priv);
1423 return 0;
1424
1425 rejected:
1426 atomic_dec(&cm_id_priv->refcount);
1427 cm_deref_id(listen_cm_id_priv);
1428 destroy:
1429 ib_destroy_cm_id(cm_id);
1430 return ret;
1431 }
1432
1433 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1434 struct cm_id_private *cm_id_priv,
1435 struct ib_cm_rep_param *param)
1436 {
1437 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1438 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1439 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1440 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1441 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1442 rep_msg->resp_resources = param->responder_resources;
1443 rep_msg->initiator_depth = param->initiator_depth;
1444 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1445 cm_rep_set_failover(rep_msg, param->failover_accepted);
1446 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1447 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1448 cm_rep_set_srq(rep_msg, param->srq);
1449 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid;
1450
1451 if (param->private_data && param->private_data_len)
1452 memcpy(rep_msg->private_data, param->private_data,
1453 param->private_data_len);
1454 }
1455
1456 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1457 struct ib_cm_rep_param *param)
1458 {
1459 struct cm_id_private *cm_id_priv;
1460 struct ib_mad_send_buf *msg;
1461 struct cm_rep_msg *rep_msg;
1462 unsigned long flags;
1463 int ret;
1464
1465 if (param->private_data &&
1466 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1467 return -EINVAL;
1468
1469 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1470 spin_lock_irqsave(&cm_id_priv->lock, flags);
1471 if (cm_id->state != IB_CM_REQ_RCVD &&
1472 cm_id->state != IB_CM_MRA_REQ_SENT) {
1473 ret = -EINVAL;
1474 goto out;
1475 }
1476
1477 ret = cm_alloc_msg(cm_id_priv, &msg);
1478 if (ret)
1479 goto out;
1480
1481 rep_msg = (struct cm_rep_msg *) msg->mad;
1482 cm_format_rep(rep_msg, cm_id_priv, param);
1483 msg->timeout_ms = cm_id_priv->timeout_ms;
1484 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1485
1486 ret = ib_post_send_mad(msg, NULL);
1487 if (ret) {
1488 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1489 cm_free_msg(msg);
1490 return ret;
1491 }
1492
1493 cm_id->state = IB_CM_REP_SENT;
1494 cm_id_priv->msg = msg;
1495 cm_id_priv->initiator_depth = param->initiator_depth;
1496 cm_id_priv->responder_resources = param->responder_resources;
1497 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1498 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1499
1500 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1501 return ret;
1502 }
1503 EXPORT_SYMBOL(ib_send_cm_rep);
1504
1505 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1506 struct cm_id_private *cm_id_priv,
1507 const void *private_data,
1508 u8 private_data_len)
1509 {
1510 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1511 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1512 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1513
1514 if (private_data && private_data_len)
1515 memcpy(rtu_msg->private_data, private_data, private_data_len);
1516 }
1517
1518 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1519 const void *private_data,
1520 u8 private_data_len)
1521 {
1522 struct cm_id_private *cm_id_priv;
1523 struct ib_mad_send_buf *msg;
1524 unsigned long flags;
1525 void *data;
1526 int ret;
1527
1528 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1529 return -EINVAL;
1530
1531 data = cm_copy_private_data(private_data, private_data_len);
1532 if (IS_ERR(data))
1533 return PTR_ERR(data);
1534
1535 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1536 spin_lock_irqsave(&cm_id_priv->lock, flags);
1537 if (cm_id->state != IB_CM_REP_RCVD &&
1538 cm_id->state != IB_CM_MRA_REP_SENT) {
1539 ret = -EINVAL;
1540 goto error;
1541 }
1542
1543 ret = cm_alloc_msg(cm_id_priv, &msg);
1544 if (ret)
1545 goto error;
1546
1547 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1548 private_data, private_data_len);
1549
1550 ret = ib_post_send_mad(msg, NULL);
1551 if (ret) {
1552 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1553 cm_free_msg(msg);
1554 kfree(data);
1555 return ret;
1556 }
1557
1558 cm_id->state = IB_CM_ESTABLISHED;
1559 cm_set_private_data(cm_id_priv, data, private_data_len);
1560 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1561 return 0;
1562
1563 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1564 kfree(data);
1565 return ret;
1566 }
1567 EXPORT_SYMBOL(ib_send_cm_rtu);
1568
1569 static void cm_format_rep_event(struct cm_work *work)
1570 {
1571 struct cm_rep_msg *rep_msg;
1572 struct ib_cm_rep_event_param *param;
1573
1574 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1575 param = &work->cm_event.param.rep_rcvd;
1576 param->remote_ca_guid = rep_msg->local_ca_guid;
1577 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1578 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1579 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1580 param->responder_resources = rep_msg->initiator_depth;
1581 param->initiator_depth = rep_msg->resp_resources;
1582 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1583 param->failover_accepted = cm_rep_get_failover(rep_msg);
1584 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1585 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1586 param->srq = cm_rep_get_srq(rep_msg);
1587 work->cm_event.private_data = &rep_msg->private_data;
1588 }
1589
1590 static void cm_dup_rep_handler(struct cm_work *work)
1591 {
1592 struct cm_id_private *cm_id_priv;
1593 struct cm_rep_msg *rep_msg;
1594 struct ib_mad_send_buf *msg = NULL;
1595 unsigned long flags;
1596 int ret;
1597
1598 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1599 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1600 rep_msg->local_comm_id);
1601 if (!cm_id_priv)
1602 return;
1603
1604 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1605 if (ret)
1606 goto deref;
1607
1608 spin_lock_irqsave(&cm_id_priv->lock, flags);
1609 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1610 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1611 cm_id_priv->private_data,
1612 cm_id_priv->private_data_len);
1613 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1614 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1615 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1616 cm_id_priv->private_data,
1617 cm_id_priv->private_data_len);
1618 else
1619 goto unlock;
1620 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1621
1622 ret = ib_post_send_mad(msg, NULL);
1623 if (ret)
1624 goto free;
1625 goto deref;
1626
1627 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1628 free: cm_free_msg(msg);
1629 deref: cm_deref_id(cm_id_priv);
1630 }
1631
1632 static int cm_rep_handler(struct cm_work *work)
1633 {
1634 struct cm_id_private *cm_id_priv;
1635 struct cm_rep_msg *rep_msg;
1636 unsigned long flags;
1637 int ret;
1638
1639 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1640 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1641 if (!cm_id_priv) {
1642 cm_dup_rep_handler(work);
1643 return -EINVAL;
1644 }
1645
1646 cm_format_rep_event(work);
1647
1648 spin_lock_irqsave(&cm_id_priv->lock, flags);
1649 switch (cm_id_priv->id.state) {
1650 case IB_CM_REQ_SENT:
1651 case IB_CM_MRA_REQ_RCVD:
1652 break;
1653 default:
1654 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1655 ret = -EINVAL;
1656 goto error;
1657 }
1658
1659 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1660 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1661 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1662
1663 spin_lock(&cm.lock);
1664 /* Check for duplicate REP. */
1665 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1666 spin_unlock(&cm.lock);
1667 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1668 ret = -EINVAL;
1669 goto error;
1670 }
1671 /* Check for a stale connection. */
1672 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1673 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1674 &cm.remote_id_table);
1675 cm_id_priv->timewait_info->inserted_remote_id = 0;
1676 spin_unlock(&cm.lock);
1677 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1678 cm_issue_rej(work->port, work->mad_recv_wc,
1679 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1680 NULL, 0);
1681 ret = -EINVAL;
1682 goto error;
1683 }
1684 spin_unlock(&cm.lock);
1685
1686 cm_id_priv->id.state = IB_CM_REP_RCVD;
1687 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1688 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1689 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1690 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1691 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1692 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1693
1694 /* todo: handle peer_to_peer */
1695
1696 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1697 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1698 if (!ret)
1699 list_add_tail(&work->list, &cm_id_priv->work_list);
1700 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1701
1702 if (ret)
1703 cm_process_work(cm_id_priv, work);
1704 else
1705 cm_deref_id(cm_id_priv);
1706 return 0;
1707
1708 error:
1709 cm_deref_id(cm_id_priv);
1710 return ret;
1711 }
1712
1713 static int cm_establish_handler(struct cm_work *work)
1714 {
1715 struct cm_id_private *cm_id_priv;
1716 unsigned long flags;
1717 int ret;
1718
1719 /* See comment in ib_cm_establish about lookup. */
1720 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1721 if (!cm_id_priv)
1722 return -EINVAL;
1723
1724 spin_lock_irqsave(&cm_id_priv->lock, flags);
1725 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1726 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1727 goto out;
1728 }
1729
1730 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1731 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1732 if (!ret)
1733 list_add_tail(&work->list, &cm_id_priv->work_list);
1734 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1735
1736 if (ret)
1737 cm_process_work(cm_id_priv, work);
1738 else
1739 cm_deref_id(cm_id_priv);
1740 return 0;
1741 out:
1742 cm_deref_id(cm_id_priv);
1743 return -EINVAL;
1744 }
1745
1746 static int cm_rtu_handler(struct cm_work *work)
1747 {
1748 struct cm_id_private *cm_id_priv;
1749 struct cm_rtu_msg *rtu_msg;
1750 unsigned long flags;
1751 int ret;
1752
1753 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1754 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1755 rtu_msg->local_comm_id);
1756 if (!cm_id_priv)
1757 return -EINVAL;
1758
1759 work->cm_event.private_data = &rtu_msg->private_data;
1760
1761 spin_lock_irqsave(&cm_id_priv->lock, flags);
1762 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1763 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1764 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1765 goto out;
1766 }
1767 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1768
1769 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1770 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1771 if (!ret)
1772 list_add_tail(&work->list, &cm_id_priv->work_list);
1773 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1774
1775 if (ret)
1776 cm_process_work(cm_id_priv, work);
1777 else
1778 cm_deref_id(cm_id_priv);
1779 return 0;
1780 out:
1781 cm_deref_id(cm_id_priv);
1782 return -EINVAL;
1783 }
1784
1785 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1786 struct cm_id_private *cm_id_priv,
1787 const void *private_data,
1788 u8 private_data_len)
1789 {
1790 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1791 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1792 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1793 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1794 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1795
1796 if (private_data && private_data_len)
1797 memcpy(dreq_msg->private_data, private_data, private_data_len);
1798 }
1799
1800 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1801 const void *private_data,
1802 u8 private_data_len)
1803 {
1804 struct cm_id_private *cm_id_priv;
1805 struct ib_mad_send_buf *msg;
1806 unsigned long flags;
1807 int ret;
1808
1809 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1810 return -EINVAL;
1811
1812 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1813 spin_lock_irqsave(&cm_id_priv->lock, flags);
1814 if (cm_id->state != IB_CM_ESTABLISHED) {
1815 ret = -EINVAL;
1816 goto out;
1817 }
1818
1819 ret = cm_alloc_msg(cm_id_priv, &msg);
1820 if (ret) {
1821 cm_enter_timewait(cm_id_priv);
1822 goto out;
1823 }
1824
1825 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1826 private_data, private_data_len);
1827 msg->timeout_ms = cm_id_priv->timeout_ms;
1828 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1829
1830 ret = ib_post_send_mad(msg, NULL);
1831 if (ret) {
1832 cm_enter_timewait(cm_id_priv);
1833 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1834 cm_free_msg(msg);
1835 return ret;
1836 }
1837
1838 cm_id->state = IB_CM_DREQ_SENT;
1839 cm_id_priv->msg = msg;
1840 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1841 return ret;
1842 }
1843 EXPORT_SYMBOL(ib_send_cm_dreq);
1844
1845 static void cm_format_drep(struct cm_drep_msg *drep_msg,
1846 struct cm_id_private *cm_id_priv,
1847 const void *private_data,
1848 u8 private_data_len)
1849 {
1850 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1851 drep_msg->local_comm_id = cm_id_priv->id.local_id;
1852 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1853
1854 if (private_data && private_data_len)
1855 memcpy(drep_msg->private_data, private_data, private_data_len);
1856 }
1857
1858 int ib_send_cm_drep(struct ib_cm_id *cm_id,
1859 const void *private_data,
1860 u8 private_data_len)
1861 {
1862 struct cm_id_private *cm_id_priv;
1863 struct ib_mad_send_buf *msg;
1864 unsigned long flags;
1865 void *data;
1866 int ret;
1867
1868 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1869 return -EINVAL;
1870
1871 data = cm_copy_private_data(private_data, private_data_len);
1872 if (IS_ERR(data))
1873 return PTR_ERR(data);
1874
1875 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1876 spin_lock_irqsave(&cm_id_priv->lock, flags);
1877 if (cm_id->state != IB_CM_DREQ_RCVD) {
1878 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1879 kfree(data);
1880 return -EINVAL;
1881 }
1882
1883 cm_set_private_data(cm_id_priv, data, private_data_len);
1884 cm_enter_timewait(cm_id_priv);
1885
1886 ret = cm_alloc_msg(cm_id_priv, &msg);
1887 if (ret)
1888 goto out;
1889
1890 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1891 private_data, private_data_len);
1892
1893 ret = ib_post_send_mad(msg, NULL);
1894 if (ret) {
1895 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1896 cm_free_msg(msg);
1897 return ret;
1898 }
1899
1900 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1901 return ret;
1902 }
1903 EXPORT_SYMBOL(ib_send_cm_drep);
1904
1905 static int cm_dreq_handler(struct cm_work *work)
1906 {
1907 struct cm_id_private *cm_id_priv;
1908 struct cm_dreq_msg *dreq_msg;
1909 struct ib_mad_send_buf *msg = NULL;
1910 unsigned long flags;
1911 int ret;
1912
1913 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1914 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1915 dreq_msg->local_comm_id);
1916 if (!cm_id_priv)
1917 return -EINVAL;
1918
1919 work->cm_event.private_data = &dreq_msg->private_data;
1920
1921 spin_lock_irqsave(&cm_id_priv->lock, flags);
1922 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1923 goto unlock;
1924
1925 switch (cm_id_priv->id.state) {
1926 case IB_CM_REP_SENT:
1927 case IB_CM_DREQ_SENT:
1928 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1929 break;
1930 case IB_CM_ESTABLISHED:
1931 case IB_CM_MRA_REP_RCVD:
1932 break;
1933 case IB_CM_TIMEWAIT:
1934 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1935 goto unlock;
1936
1937 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1938 cm_id_priv->private_data,
1939 cm_id_priv->private_data_len);
1940 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1941
1942 if (ib_post_send_mad(msg, NULL))
1943 cm_free_msg(msg);
1944 goto deref;
1945 default:
1946 goto unlock;
1947 }
1948 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1949 cm_id_priv->tid = dreq_msg->hdr.tid;
1950 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1951 if (!ret)
1952 list_add_tail(&work->list, &cm_id_priv->work_list);
1953 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1954
1955 if (ret)
1956 cm_process_work(cm_id_priv, work);
1957 else
1958 cm_deref_id(cm_id_priv);
1959 return 0;
1960
1961 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1962 deref: cm_deref_id(cm_id_priv);
1963 return -EINVAL;
1964 }
1965
1966 static int cm_drep_handler(struct cm_work *work)
1967 {
1968 struct cm_id_private *cm_id_priv;
1969 struct cm_drep_msg *drep_msg;
1970 unsigned long flags;
1971 int ret;
1972
1973 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1974 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1975 drep_msg->local_comm_id);
1976 if (!cm_id_priv)
1977 return -EINVAL;
1978
1979 work->cm_event.private_data = &drep_msg->private_data;
1980
1981 spin_lock_irqsave(&cm_id_priv->lock, flags);
1982 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
1983 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
1984 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1985 goto out;
1986 }
1987 cm_enter_timewait(cm_id_priv);
1988
1989 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1990 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1991 if (!ret)
1992 list_add_tail(&work->list, &cm_id_priv->work_list);
1993 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1994
1995 if (ret)
1996 cm_process_work(cm_id_priv, work);
1997 else
1998 cm_deref_id(cm_id_priv);
1999 return 0;
2000 out:
2001 cm_deref_id(cm_id_priv);
2002 return -EINVAL;
2003 }
2004
2005 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2006 enum ib_cm_rej_reason reason,
2007 void *ari,
2008 u8 ari_length,
2009 const void *private_data,
2010 u8 private_data_len)
2011 {
2012 struct cm_id_private *cm_id_priv;
2013 struct ib_mad_send_buf *msg;
2014 unsigned long flags;
2015 int ret;
2016
2017 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2018 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2019 return -EINVAL;
2020
2021 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2022
2023 spin_lock_irqsave(&cm_id_priv->lock, flags);
2024 switch (cm_id->state) {
2025 case IB_CM_REQ_SENT:
2026 case IB_CM_MRA_REQ_RCVD:
2027 case IB_CM_REQ_RCVD:
2028 case IB_CM_MRA_REQ_SENT:
2029 case IB_CM_REP_RCVD:
2030 case IB_CM_MRA_REP_SENT:
2031 ret = cm_alloc_msg(cm_id_priv, &msg);
2032 if (!ret)
2033 cm_format_rej((struct cm_rej_msg *) msg->mad,
2034 cm_id_priv, reason, ari, ari_length,
2035 private_data, private_data_len);
2036
2037 cm_reset_to_idle(cm_id_priv);
2038 break;
2039 case IB_CM_REP_SENT:
2040 case IB_CM_MRA_REP_RCVD:
2041 ret = cm_alloc_msg(cm_id_priv, &msg);
2042 if (!ret)
2043 cm_format_rej((struct cm_rej_msg *) msg->mad,
2044 cm_id_priv, reason, ari, ari_length,
2045 private_data, private_data_len);
2046
2047 cm_enter_timewait(cm_id_priv);
2048 break;
2049 default:
2050 ret = -EINVAL;
2051 goto out;
2052 }
2053
2054 if (ret)
2055 goto out;
2056
2057 ret = ib_post_send_mad(msg, NULL);
2058 if (ret)
2059 cm_free_msg(msg);
2060
2061 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2062 return ret;
2063 }
2064 EXPORT_SYMBOL(ib_send_cm_rej);
2065
2066 static void cm_format_rej_event(struct cm_work *work)
2067 {
2068 struct cm_rej_msg *rej_msg;
2069 struct ib_cm_rej_event_param *param;
2070
2071 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2072 param = &work->cm_event.param.rej_rcvd;
2073 param->ari = rej_msg->ari;
2074 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2075 param->reason = __be16_to_cpu(rej_msg->reason);
2076 work->cm_event.private_data = &rej_msg->private_data;
2077 }
2078
2079 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2080 {
2081 struct cm_timewait_info *timewait_info;
2082 struct cm_id_private *cm_id_priv;
2083 unsigned long flags;
2084 __be32 remote_id;
2085
2086 remote_id = rej_msg->local_comm_id;
2087
2088 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2089 spin_lock_irqsave(&cm.lock, flags);
2090 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2091 remote_id);
2092 if (!timewait_info) {
2093 spin_unlock_irqrestore(&cm.lock, flags);
2094 return NULL;
2095 }
2096 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2097 (timewait_info->work.local_id ^
2098 cm.random_id_operand));
2099 if (cm_id_priv) {
2100 if (cm_id_priv->id.remote_id == remote_id)
2101 atomic_inc(&cm_id_priv->refcount);
2102 else
2103 cm_id_priv = NULL;
2104 }
2105 spin_unlock_irqrestore(&cm.lock, flags);
2106 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2107 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2108 else
2109 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2110
2111 return cm_id_priv;
2112 }
2113
2114 static int cm_rej_handler(struct cm_work *work)
2115 {
2116 struct cm_id_private *cm_id_priv;
2117 struct cm_rej_msg *rej_msg;
2118 unsigned long flags;
2119 int ret;
2120
2121 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2122 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2123 if (!cm_id_priv)
2124 return -EINVAL;
2125
2126 cm_format_rej_event(work);
2127
2128 spin_lock_irqsave(&cm_id_priv->lock, flags);
2129 switch (cm_id_priv->id.state) {
2130 case IB_CM_REQ_SENT:
2131 case IB_CM_MRA_REQ_RCVD:
2132 case IB_CM_REP_SENT:
2133 case IB_CM_MRA_REP_RCVD:
2134 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2135 /* fall through */
2136 case IB_CM_REQ_RCVD:
2137 case IB_CM_MRA_REQ_SENT:
2138 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2139 cm_enter_timewait(cm_id_priv);
2140 else
2141 cm_reset_to_idle(cm_id_priv);
2142 break;
2143 case IB_CM_DREQ_SENT:
2144 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2145 /* fall through */
2146 case IB_CM_REP_RCVD:
2147 case IB_CM_MRA_REP_SENT:
2148 case IB_CM_ESTABLISHED:
2149 cm_enter_timewait(cm_id_priv);
2150 break;
2151 default:
2152 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2153 ret = -EINVAL;
2154 goto out;
2155 }
2156
2157 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2158 if (!ret)
2159 list_add_tail(&work->list, &cm_id_priv->work_list);
2160 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2161
2162 if (ret)
2163 cm_process_work(cm_id_priv, work);
2164 else
2165 cm_deref_id(cm_id_priv);
2166 return 0;
2167 out:
2168 cm_deref_id(cm_id_priv);
2169 return -EINVAL;
2170 }
2171
2172 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2173 u8 service_timeout,
2174 const void *private_data,
2175 u8 private_data_len)
2176 {
2177 struct cm_id_private *cm_id_priv;
2178 struct ib_mad_send_buf *msg;
2179 void *data;
2180 unsigned long flags;
2181 int ret;
2182
2183 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2184 return -EINVAL;
2185
2186 data = cm_copy_private_data(private_data, private_data_len);
2187 if (IS_ERR(data))
2188 return PTR_ERR(data);
2189
2190 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2191
2192 spin_lock_irqsave(&cm_id_priv->lock, flags);
2193 switch(cm_id_priv->id.state) {
2194 case IB_CM_REQ_RCVD:
2195 ret = cm_alloc_msg(cm_id_priv, &msg);
2196 if (ret)
2197 goto error1;
2198
2199 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2200 CM_MSG_RESPONSE_REQ, service_timeout,
2201 private_data, private_data_len);
2202 ret = ib_post_send_mad(msg, NULL);
2203 if (ret)
2204 goto error2;
2205 cm_id->state = IB_CM_MRA_REQ_SENT;
2206 break;
2207 case IB_CM_REP_RCVD:
2208 ret = cm_alloc_msg(cm_id_priv, &msg);
2209 if (ret)
2210 goto error1;
2211
2212 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2213 CM_MSG_RESPONSE_REP, service_timeout,
2214 private_data, private_data_len);
2215 ret = ib_post_send_mad(msg, NULL);
2216 if (ret)
2217 goto error2;
2218 cm_id->state = IB_CM_MRA_REP_SENT;
2219 break;
2220 case IB_CM_ESTABLISHED:
2221 ret = cm_alloc_msg(cm_id_priv, &msg);
2222 if (ret)
2223 goto error1;
2224
2225 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2226 CM_MSG_RESPONSE_OTHER, service_timeout,
2227 private_data, private_data_len);
2228 ret = ib_post_send_mad(msg, NULL);
2229 if (ret)
2230 goto error2;
2231 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2232 break;
2233 default:
2234 ret = -EINVAL;
2235 goto error1;
2236 }
2237 cm_id_priv->service_timeout = service_timeout;
2238 cm_set_private_data(cm_id_priv, data, private_data_len);
2239 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2240 return 0;
2241
2242 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2243 kfree(data);
2244 return ret;
2245
2246 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2247 kfree(data);
2248 cm_free_msg(msg);
2249 return ret;
2250 }
2251 EXPORT_SYMBOL(ib_send_cm_mra);
2252
2253 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2254 {
2255 switch (cm_mra_get_msg_mraed(mra_msg)) {
2256 case CM_MSG_RESPONSE_REQ:
2257 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2258 case CM_MSG_RESPONSE_REP:
2259 case CM_MSG_RESPONSE_OTHER:
2260 return cm_acquire_id(mra_msg->remote_comm_id,
2261 mra_msg->local_comm_id);
2262 default:
2263 return NULL;
2264 }
2265 }
2266
2267 static int cm_mra_handler(struct cm_work *work)
2268 {
2269 struct cm_id_private *cm_id_priv;
2270 struct cm_mra_msg *mra_msg;
2271 unsigned long flags;
2272 int timeout, ret;
2273
2274 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2275 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2276 if (!cm_id_priv)
2277 return -EINVAL;
2278
2279 work->cm_event.private_data = &mra_msg->private_data;
2280 work->cm_event.param.mra_rcvd.service_timeout =
2281 cm_mra_get_service_timeout(mra_msg);
2282 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2283 cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2284
2285 spin_lock_irqsave(&cm_id_priv->lock, flags);
2286 switch (cm_id_priv->id.state) {
2287 case IB_CM_REQ_SENT:
2288 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2289 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2290 cm_id_priv->msg, timeout))
2291 goto out;
2292 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2293 break;
2294 case IB_CM_REP_SENT:
2295 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2296 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2297 cm_id_priv->msg, timeout))
2298 goto out;
2299 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2300 break;
2301 case IB_CM_ESTABLISHED:
2302 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2303 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2304 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2305 cm_id_priv->msg, timeout))
2306 goto out;
2307 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2308 break;
2309 default:
2310 goto out;
2311 }
2312
2313 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2314 cm_id_priv->id.state;
2315 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2316 if (!ret)
2317 list_add_tail(&work->list, &cm_id_priv->work_list);
2318 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2319
2320 if (ret)
2321 cm_process_work(cm_id_priv, work);
2322 else
2323 cm_deref_id(cm_id_priv);
2324 return 0;
2325 out:
2326 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2327 cm_deref_id(cm_id_priv);
2328 return -EINVAL;
2329 }
2330
2331 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2332 struct cm_id_private *cm_id_priv,
2333 struct ib_sa_path_rec *alternate_path,
2334 const void *private_data,
2335 u8 private_data_len)
2336 {
2337 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2338 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2339 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2340 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2341 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2342 /* todo: need remote CM response timeout */
2343 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2344 lap_msg->alt_local_lid = alternate_path->slid;
2345 lap_msg->alt_remote_lid = alternate_path->dlid;
2346 lap_msg->alt_local_gid = alternate_path->sgid;
2347 lap_msg->alt_remote_gid = alternate_path->dgid;
2348 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2349 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2350 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2351 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2352 cm_lap_set_sl(lap_msg, alternate_path->sl);
2353 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2354 cm_lap_set_local_ack_timeout(lap_msg,
2355 min(31, alternate_path->packet_life_time + 1));
2356
2357 if (private_data && private_data_len)
2358 memcpy(lap_msg->private_data, private_data, private_data_len);
2359 }
2360
2361 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2362 struct ib_sa_path_rec *alternate_path,
2363 const void *private_data,
2364 u8 private_data_len)
2365 {
2366 struct cm_id_private *cm_id_priv;
2367 struct ib_mad_send_buf *msg;
2368 unsigned long flags;
2369 int ret;
2370
2371 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2372 return -EINVAL;
2373
2374 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2375 spin_lock_irqsave(&cm_id_priv->lock, flags);
2376 if (cm_id->state != IB_CM_ESTABLISHED ||
2377 cm_id->lap_state != IB_CM_LAP_IDLE) {
2378 ret = -EINVAL;
2379 goto out;
2380 }
2381
2382 ret = cm_alloc_msg(cm_id_priv, &msg);
2383 if (ret)
2384 goto out;
2385
2386 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2387 alternate_path, private_data, private_data_len);
2388 msg->timeout_ms = cm_id_priv->timeout_ms;
2389 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2390
2391 ret = ib_post_send_mad(msg, NULL);
2392 if (ret) {
2393 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2394 cm_free_msg(msg);
2395 return ret;
2396 }
2397
2398 cm_id->lap_state = IB_CM_LAP_SENT;
2399 cm_id_priv->msg = msg;
2400
2401 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2402 return ret;
2403 }
2404 EXPORT_SYMBOL(ib_send_cm_lap);
2405
2406 static void cm_format_path_from_lap(struct ib_sa_path_rec *path,
2407 struct cm_lap_msg *lap_msg)
2408 {
2409 memset(path, 0, sizeof *path);
2410 path->dgid = lap_msg->alt_local_gid;
2411 path->sgid = lap_msg->alt_remote_gid;
2412 path->dlid = lap_msg->alt_local_lid;
2413 path->slid = lap_msg->alt_remote_lid;
2414 path->flow_label = cm_lap_get_flow_label(lap_msg);
2415 path->hop_limit = lap_msg->alt_hop_limit;
2416 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2417 path->reversible = 1;
2418 /* pkey is same as in REQ */
2419 path->sl = cm_lap_get_sl(lap_msg);
2420 path->mtu_selector = IB_SA_EQ;
2421 /* mtu is same as in REQ */
2422 path->rate_selector = IB_SA_EQ;
2423 path->rate = cm_lap_get_packet_rate(lap_msg);
2424 path->packet_life_time_selector = IB_SA_EQ;
2425 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2426 path->packet_life_time -= (path->packet_life_time > 0);
2427 }
2428
2429 static int cm_lap_handler(struct cm_work *work)
2430 {
2431 struct cm_id_private *cm_id_priv;
2432 struct cm_lap_msg *lap_msg;
2433 struct ib_cm_lap_event_param *param;
2434 struct ib_mad_send_buf *msg = NULL;
2435 unsigned long flags;
2436 int ret;
2437
2438 /* todo: verify LAP request and send reject APR if invalid. */
2439 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2440 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2441 lap_msg->local_comm_id);
2442 if (!cm_id_priv)
2443 return -EINVAL;
2444
2445 param = &work->cm_event.param.lap_rcvd;
2446 param->alternate_path = &work->path[0];
2447 cm_format_path_from_lap(param->alternate_path, lap_msg);
2448 work->cm_event.private_data = &lap_msg->private_data;
2449
2450 spin_lock_irqsave(&cm_id_priv->lock, flags);
2451 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2452 goto unlock;
2453
2454 switch (cm_id_priv->id.lap_state) {
2455 case IB_CM_LAP_IDLE:
2456 break;
2457 case IB_CM_MRA_LAP_SENT:
2458 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2459 goto unlock;
2460
2461 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2462 CM_MSG_RESPONSE_OTHER,
2463 cm_id_priv->service_timeout,
2464 cm_id_priv->private_data,
2465 cm_id_priv->private_data_len);
2466 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2467
2468 if (ib_post_send_mad(msg, NULL))
2469 cm_free_msg(msg);
2470 goto deref;
2471 default:
2472 goto unlock;
2473 }
2474
2475 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2476 cm_id_priv->tid = lap_msg->hdr.tid;
2477 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2478 if (!ret)
2479 list_add_tail(&work->list, &cm_id_priv->work_list);
2480 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2481
2482 if (ret)
2483 cm_process_work(cm_id_priv, work);
2484 else
2485 cm_deref_id(cm_id_priv);
2486 return 0;
2487
2488 unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2489 deref: cm_deref_id(cm_id_priv);
2490 return -EINVAL;
2491 }
2492
2493 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2494 struct cm_id_private *cm_id_priv,
2495 enum ib_cm_apr_status status,
2496 void *info,
2497 u8 info_length,
2498 const void *private_data,
2499 u8 private_data_len)
2500 {
2501 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2502 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2503 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2504 apr_msg->ap_status = (u8) status;
2505
2506 if (info && info_length) {
2507 apr_msg->info_length = info_length;
2508 memcpy(apr_msg->info, info, info_length);
2509 }
2510
2511 if (private_data && private_data_len)
2512 memcpy(apr_msg->private_data, private_data, private_data_len);
2513 }
2514
2515 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2516 enum ib_cm_apr_status status,
2517 void *info,
2518 u8 info_length,
2519 const void *private_data,
2520 u8 private_data_len)
2521 {
2522 struct cm_id_private *cm_id_priv;
2523 struct ib_mad_send_buf *msg;
2524 unsigned long flags;
2525 int ret;
2526
2527 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2528 (info && info_length > IB_CM_APR_INFO_LENGTH))
2529 return -EINVAL;
2530
2531 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2532 spin_lock_irqsave(&cm_id_priv->lock, flags);
2533 if (cm_id->state != IB_CM_ESTABLISHED ||
2534 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2535 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2536 ret = -EINVAL;
2537 goto out;
2538 }
2539
2540 ret = cm_alloc_msg(cm_id_priv, &msg);
2541 if (ret)
2542 goto out;
2543
2544 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2545 info, info_length, private_data, private_data_len);
2546 ret = ib_post_send_mad(msg, NULL);
2547 if (ret) {
2548 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2549 cm_free_msg(msg);
2550 return ret;
2551 }
2552
2553 cm_id->lap_state = IB_CM_LAP_IDLE;
2554 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2555 return ret;
2556 }
2557 EXPORT_SYMBOL(ib_send_cm_apr);
2558
2559 static int cm_apr_handler(struct cm_work *work)
2560 {
2561 struct cm_id_private *cm_id_priv;
2562 struct cm_apr_msg *apr_msg;
2563 unsigned long flags;
2564 int ret;
2565
2566 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2567 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2568 apr_msg->local_comm_id);
2569 if (!cm_id_priv)
2570 return -EINVAL; /* Unmatched reply. */
2571
2572 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2573 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2574 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2575 work->cm_event.private_data = &apr_msg->private_data;
2576
2577 spin_lock_irqsave(&cm_id_priv->lock, flags);
2578 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2579 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2580 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2581 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2582 goto out;
2583 }
2584 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2585 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2586 cm_id_priv->msg = NULL;
2587
2588 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2589 if (!ret)
2590 list_add_tail(&work->list, &cm_id_priv->work_list);
2591 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2592
2593 if (ret)
2594 cm_process_work(cm_id_priv, work);
2595 else
2596 cm_deref_id(cm_id_priv);
2597 return 0;
2598 out:
2599 cm_deref_id(cm_id_priv);
2600 return -EINVAL;
2601 }
2602
2603 static int cm_timewait_handler(struct cm_work *work)
2604 {
2605 struct cm_timewait_info *timewait_info;
2606 struct cm_id_private *cm_id_priv;
2607 int ret;
2608
2609 timewait_info = (struct cm_timewait_info *)work;
2610 spin_lock_irq(&cm.lock);
2611 list_del(&timewait_info->list);
2612 spin_unlock_irq(&cm.lock);
2613
2614 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2615 timewait_info->work.remote_id);
2616 if (!cm_id_priv)
2617 return -EINVAL;
2618
2619 spin_lock_irq(&cm_id_priv->lock);
2620 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2621 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2622 spin_unlock_irq(&cm_id_priv->lock);
2623 goto out;
2624 }
2625 cm_id_priv->id.state = IB_CM_IDLE;
2626 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2627 if (!ret)
2628 list_add_tail(&work->list, &cm_id_priv->work_list);
2629 spin_unlock_irq(&cm_id_priv->lock);
2630
2631 if (ret)
2632 cm_process_work(cm_id_priv, work);
2633 else
2634 cm_deref_id(cm_id_priv);
2635 return 0;
2636 out:
2637 cm_deref_id(cm_id_priv);
2638 return -EINVAL;
2639 }
2640
2641 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2642 struct cm_id_private *cm_id_priv,
2643 struct ib_cm_sidr_req_param *param)
2644 {
2645 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2646 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2647 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2648 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
2649 sidr_req_msg->service_id = param->service_id;
2650
2651 if (param->private_data && param->private_data_len)
2652 memcpy(sidr_req_msg->private_data, param->private_data,
2653 param->private_data_len);
2654 }
2655
2656 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2657 struct ib_cm_sidr_req_param *param)
2658 {
2659 struct cm_id_private *cm_id_priv;
2660 struct ib_mad_send_buf *msg;
2661 unsigned long flags;
2662 int ret;
2663
2664 if (!param->path || (param->private_data &&
2665 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2666 return -EINVAL;
2667
2668 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2669 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2670 if (ret)
2671 goto out;
2672
2673 cm_id->service_id = param->service_id;
2674 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
2675 cm_id_priv->timeout_ms = param->timeout_ms;
2676 cm_id_priv->max_cm_retries = param->max_cm_retries;
2677 ret = cm_alloc_msg(cm_id_priv, &msg);
2678 if (ret)
2679 goto out;
2680
2681 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2682 param);
2683 msg->timeout_ms = cm_id_priv->timeout_ms;
2684 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2685
2686 spin_lock_irqsave(&cm_id_priv->lock, flags);
2687 if (cm_id->state == IB_CM_IDLE)
2688 ret = ib_post_send_mad(msg, NULL);
2689 else
2690 ret = -EINVAL;
2691
2692 if (ret) {
2693 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2694 cm_free_msg(msg);
2695 goto out;
2696 }
2697 cm_id->state = IB_CM_SIDR_REQ_SENT;
2698 cm_id_priv->msg = msg;
2699 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2700 out:
2701 return ret;
2702 }
2703 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2704
2705 static void cm_format_sidr_req_event(struct cm_work *work,
2706 struct ib_cm_id *listen_id)
2707 {
2708 struct cm_sidr_req_msg *sidr_req_msg;
2709 struct ib_cm_sidr_req_event_param *param;
2710
2711 sidr_req_msg = (struct cm_sidr_req_msg *)
2712 work->mad_recv_wc->recv_buf.mad;
2713 param = &work->cm_event.param.sidr_req_rcvd;
2714 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2715 param->listen_id = listen_id;
2716 param->port = work->port->port_num;
2717 work->cm_event.private_data = &sidr_req_msg->private_data;
2718 }
2719
2720 static int cm_sidr_req_handler(struct cm_work *work)
2721 {
2722 struct ib_cm_id *cm_id;
2723 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2724 struct cm_sidr_req_msg *sidr_req_msg;
2725 struct ib_wc *wc;
2726 unsigned long flags;
2727
2728 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
2729 if (IS_ERR(cm_id))
2730 return PTR_ERR(cm_id);
2731 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2732
2733 /* Record SGID/SLID and request ID for lookup. */
2734 sidr_req_msg = (struct cm_sidr_req_msg *)
2735 work->mad_recv_wc->recv_buf.mad;
2736 wc = work->mad_recv_wc->wc;
2737 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2738 cm_id_priv->av.dgid.global.interface_id = 0;
2739 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2740 work->mad_recv_wc->recv_buf.grh,
2741 &cm_id_priv->av);
2742 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2743 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2744 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2745 atomic_inc(&cm_id_priv->work_count);
2746
2747 spin_lock_irqsave(&cm.lock, flags);
2748 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2749 if (cur_cm_id_priv) {
2750 spin_unlock_irqrestore(&cm.lock, flags);
2751 goto out; /* Duplicate message. */
2752 }
2753 cur_cm_id_priv = cm_find_listen(cm_id->device,
2754 sidr_req_msg->service_id,
2755 sidr_req_msg->private_data);
2756 if (!cur_cm_id_priv) {
2757 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2758 spin_unlock_irqrestore(&cm.lock, flags);
2759 /* todo: reply with no match */
2760 goto out; /* No match. */
2761 }
2762 atomic_inc(&cur_cm_id_priv->refcount);
2763 spin_unlock_irqrestore(&cm.lock, flags);
2764
2765 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2766 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2767 cm_id_priv->id.service_id = sidr_req_msg->service_id;
2768 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
2769
2770 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2771 cm_process_work(cm_id_priv, work);
2772 cm_deref_id(cur_cm_id_priv);
2773 return 0;
2774 out:
2775 ib_destroy_cm_id(&cm_id_priv->id);
2776 return -EINVAL;
2777 }
2778
2779 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2780 struct cm_id_private *cm_id_priv,
2781 struct ib_cm_sidr_rep_param *param)
2782 {
2783 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2784 cm_id_priv->tid);
2785 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2786 sidr_rep_msg->status = param->status;
2787 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2788 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2789 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2790
2791 if (param->info && param->info_length)
2792 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2793
2794 if (param->private_data && param->private_data_len)
2795 memcpy(sidr_rep_msg->private_data, param->private_data,
2796 param->private_data_len);
2797 }
2798
2799 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2800 struct ib_cm_sidr_rep_param *param)
2801 {
2802 struct cm_id_private *cm_id_priv;
2803 struct ib_mad_send_buf *msg;
2804 unsigned long flags;
2805 int ret;
2806
2807 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2808 (param->private_data &&
2809 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2810 return -EINVAL;
2811
2812 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2813 spin_lock_irqsave(&cm_id_priv->lock, flags);
2814 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2815 ret = -EINVAL;
2816 goto error;
2817 }
2818
2819 ret = cm_alloc_msg(cm_id_priv, &msg);
2820 if (ret)
2821 goto error;
2822
2823 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2824 param);
2825 ret = ib_post_send_mad(msg, NULL);
2826 if (ret) {
2827 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2828 cm_free_msg(msg);
2829 return ret;
2830 }
2831 cm_id->state = IB_CM_IDLE;
2832 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2833
2834 spin_lock_irqsave(&cm.lock, flags);
2835 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2836 spin_unlock_irqrestore(&cm.lock, flags);
2837 return 0;
2838
2839 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2840 return ret;
2841 }
2842 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2843
2844 static void cm_format_sidr_rep_event(struct cm_work *work)
2845 {
2846 struct cm_sidr_rep_msg *sidr_rep_msg;
2847 struct ib_cm_sidr_rep_event_param *param;
2848
2849 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2850 work->mad_recv_wc->recv_buf.mad;
2851 param = &work->cm_event.param.sidr_rep_rcvd;
2852 param->status = sidr_rep_msg->status;
2853 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2854 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2855 param->info = &sidr_rep_msg->info;
2856 param->info_len = sidr_rep_msg->info_length;
2857 work->cm_event.private_data = &sidr_rep_msg->private_data;
2858 }
2859
2860 static int cm_sidr_rep_handler(struct cm_work *work)
2861 {
2862 struct cm_sidr_rep_msg *sidr_rep_msg;
2863 struct cm_id_private *cm_id_priv;
2864 unsigned long flags;
2865
2866 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2867 work->mad_recv_wc->recv_buf.mad;
2868 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2869 if (!cm_id_priv)
2870 return -EINVAL; /* Unmatched reply. */
2871
2872 spin_lock_irqsave(&cm_id_priv->lock, flags);
2873 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2874 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2875 goto out;
2876 }
2877 cm_id_priv->id.state = IB_CM_IDLE;
2878 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2879 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2880
2881 cm_format_sidr_rep_event(work);
2882 cm_process_work(cm_id_priv, work);
2883 return 0;
2884 out:
2885 cm_deref_id(cm_id_priv);
2886 return -EINVAL;
2887 }
2888
2889 static void cm_process_send_error(struct ib_mad_send_buf *msg,
2890 enum ib_wc_status wc_status)
2891 {
2892 struct cm_id_private *cm_id_priv;
2893 struct ib_cm_event cm_event;
2894 enum ib_cm_state state;
2895 unsigned long flags;
2896 int ret;
2897
2898 memset(&cm_event, 0, sizeof cm_event);
2899 cm_id_priv = msg->context[0];
2900
2901 /* Discard old sends or ones without a response. */
2902 spin_lock_irqsave(&cm_id_priv->lock, flags);
2903 state = (enum ib_cm_state) (unsigned long) msg->context[1];
2904 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2905 goto discard;
2906
2907 switch (state) {
2908 case IB_CM_REQ_SENT:
2909 case IB_CM_MRA_REQ_RCVD:
2910 cm_reset_to_idle(cm_id_priv);
2911 cm_event.event = IB_CM_REQ_ERROR;
2912 break;
2913 case IB_CM_REP_SENT:
2914 case IB_CM_MRA_REP_RCVD:
2915 cm_reset_to_idle(cm_id_priv);
2916 cm_event.event = IB_CM_REP_ERROR;
2917 break;
2918 case IB_CM_DREQ_SENT:
2919 cm_enter_timewait(cm_id_priv);
2920 cm_event.event = IB_CM_DREQ_ERROR;
2921 break;
2922 case IB_CM_SIDR_REQ_SENT:
2923 cm_id_priv->id.state = IB_CM_IDLE;
2924 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2925 break;
2926 default:
2927 goto discard;
2928 }
2929 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2930 cm_event.param.send_status = wc_status;
2931
2932 /* No other events can occur on the cm_id at this point. */
2933 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2934 cm_free_msg(msg);
2935 if (ret)
2936 ib_destroy_cm_id(&cm_id_priv->id);
2937 return;
2938 discard:
2939 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2940 cm_free_msg(msg);
2941 }
2942
2943 static void cm_send_handler(struct ib_mad_agent *mad_agent,
2944 struct ib_mad_send_wc *mad_send_wc)
2945 {
2946 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
2947
2948 switch (mad_send_wc->status) {
2949 case IB_WC_SUCCESS:
2950 case IB_WC_WR_FLUSH_ERR:
2951 cm_free_msg(msg);
2952 break;
2953 default:
2954 if (msg->context[0] && msg->context[1])
2955 cm_process_send_error(msg, mad_send_wc->status);
2956 else
2957 cm_free_msg(msg);
2958 break;
2959 }
2960 }
2961
2962 static void cm_work_handler(void *data)
2963 {
2964 struct cm_work *work = data;
2965 int ret;
2966
2967 switch (work->cm_event.event) {
2968 case IB_CM_REQ_RECEIVED:
2969 ret = cm_req_handler(work);
2970 break;
2971 case IB_CM_MRA_RECEIVED:
2972 ret = cm_mra_handler(work);
2973 break;
2974 case IB_CM_REJ_RECEIVED:
2975 ret = cm_rej_handler(work);
2976 break;
2977 case IB_CM_REP_RECEIVED:
2978 ret = cm_rep_handler(work);
2979 break;
2980 case IB_CM_RTU_RECEIVED:
2981 ret = cm_rtu_handler(work);
2982 break;
2983 case IB_CM_USER_ESTABLISHED:
2984 ret = cm_establish_handler(work);
2985 break;
2986 case IB_CM_DREQ_RECEIVED:
2987 ret = cm_dreq_handler(work);
2988 break;
2989 case IB_CM_DREP_RECEIVED:
2990 ret = cm_drep_handler(work);
2991 break;
2992 case IB_CM_SIDR_REQ_RECEIVED:
2993 ret = cm_sidr_req_handler(work);
2994 break;
2995 case IB_CM_SIDR_REP_RECEIVED:
2996 ret = cm_sidr_rep_handler(work);
2997 break;
2998 case IB_CM_LAP_RECEIVED:
2999 ret = cm_lap_handler(work);
3000 break;
3001 case IB_CM_APR_RECEIVED:
3002 ret = cm_apr_handler(work);
3003 break;
3004 case IB_CM_TIMEWAIT_EXIT:
3005 ret = cm_timewait_handler(work);
3006 break;
3007 default:
3008 ret = -EINVAL;
3009 break;
3010 }
3011 if (ret)
3012 cm_free_work(work);
3013 }
3014
3015 int ib_cm_establish(struct ib_cm_id *cm_id)
3016 {
3017 struct cm_id_private *cm_id_priv;
3018 struct cm_work *work;
3019 unsigned long flags;
3020 int ret = 0;
3021
3022 work = kmalloc(sizeof *work, GFP_ATOMIC);
3023 if (!work)
3024 return -ENOMEM;
3025
3026 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3027 spin_lock_irqsave(&cm_id_priv->lock, flags);
3028 switch (cm_id->state)
3029 {
3030 case IB_CM_REP_SENT:
3031 case IB_CM_MRA_REP_RCVD:
3032 cm_id->state = IB_CM_ESTABLISHED;
3033 break;
3034 case IB_CM_ESTABLISHED:
3035 ret = -EISCONN;
3036 break;
3037 default:
3038 ret = -EINVAL;
3039 break;
3040 }
3041 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3042
3043 if (ret) {
3044 kfree(work);
3045 goto out;
3046 }
3047
3048 /*
3049 * The CM worker thread may try to destroy the cm_id before it
3050 * can execute this work item. To prevent potential deadlock,
3051 * we need to find the cm_id once we're in the context of the
3052 * worker thread, rather than holding a reference on it.
3053 */
3054 INIT_WORK(&work->work, cm_work_handler, work);
3055 work->local_id = cm_id->local_id;
3056 work->remote_id = cm_id->remote_id;
3057 work->mad_recv_wc = NULL;
3058 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3059 queue_work(cm.wq, &work->work);
3060 out:
3061 return ret;
3062 }
3063 EXPORT_SYMBOL(ib_cm_establish);
3064
3065 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3066 struct ib_mad_recv_wc *mad_recv_wc)
3067 {
3068 struct cm_work *work;
3069 enum ib_cm_event_type event;
3070 int paths = 0;
3071
3072 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3073 case CM_REQ_ATTR_ID:
3074 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3075 alt_local_lid != 0);
3076 event = IB_CM_REQ_RECEIVED;
3077 break;
3078 case CM_MRA_ATTR_ID:
3079 event = IB_CM_MRA_RECEIVED;
3080 break;
3081 case CM_REJ_ATTR_ID:
3082 event = IB_CM_REJ_RECEIVED;
3083 break;
3084 case CM_REP_ATTR_ID:
3085 event = IB_CM_REP_RECEIVED;
3086 break;
3087 case CM_RTU_ATTR_ID:
3088 event = IB_CM_RTU_RECEIVED;
3089 break;
3090 case CM_DREQ_ATTR_ID:
3091 event = IB_CM_DREQ_RECEIVED;
3092 break;
3093 case CM_DREP_ATTR_ID:
3094 event = IB_CM_DREP_RECEIVED;
3095 break;
3096 case CM_SIDR_REQ_ATTR_ID:
3097 event = IB_CM_SIDR_REQ_RECEIVED;
3098 break;
3099 case CM_SIDR_REP_ATTR_ID:
3100 event = IB_CM_SIDR_REP_RECEIVED;
3101 break;
3102 case CM_LAP_ATTR_ID:
3103 paths = 1;
3104 event = IB_CM_LAP_RECEIVED;
3105 break;
3106 case CM_APR_ATTR_ID:
3107 event = IB_CM_APR_RECEIVED;
3108 break;
3109 default:
3110 ib_free_recv_mad(mad_recv_wc);
3111 return;
3112 }
3113
3114 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3115 GFP_KERNEL);
3116 if (!work) {
3117 ib_free_recv_mad(mad_recv_wc);
3118 return;
3119 }
3120
3121 INIT_WORK(&work->work, cm_work_handler, work);
3122 work->cm_event.event = event;
3123 work->mad_recv_wc = mad_recv_wc;
3124 work->port = (struct cm_port *)mad_agent->context;
3125 queue_work(cm.wq, &work->work);
3126 }
3127
3128 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3129 struct ib_qp_attr *qp_attr,
3130 int *qp_attr_mask)
3131 {
3132 unsigned long flags;
3133 int ret;
3134
3135 spin_lock_irqsave(&cm_id_priv->lock, flags);
3136 switch (cm_id_priv->id.state) {
3137 case IB_CM_REQ_SENT:
3138 case IB_CM_MRA_REQ_RCVD:
3139 case IB_CM_REQ_RCVD:
3140 case IB_CM_MRA_REQ_SENT:
3141 case IB_CM_REP_RCVD:
3142 case IB_CM_MRA_REP_SENT:
3143 case IB_CM_REP_SENT:
3144 case IB_CM_MRA_REP_RCVD:
3145 case IB_CM_ESTABLISHED:
3146 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3147 IB_QP_PKEY_INDEX | IB_QP_PORT;
3148 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE |
3149 IB_ACCESS_REMOTE_WRITE;
3150 if (cm_id_priv->responder_resources)
3151 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3152 IB_ACCESS_REMOTE_ATOMIC;
3153 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3154 qp_attr->port_num = cm_id_priv->av.port->port_num;
3155 ret = 0;
3156 break;
3157 default:
3158 ret = -EINVAL;
3159 break;
3160 }
3161 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3162 return ret;
3163 }
3164
3165 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3166 struct ib_qp_attr *qp_attr,
3167 int *qp_attr_mask)
3168 {
3169 unsigned long flags;
3170 int ret;
3171
3172 spin_lock_irqsave(&cm_id_priv->lock, flags);
3173 switch (cm_id_priv->id.state) {
3174 case IB_CM_REQ_RCVD:
3175 case IB_CM_MRA_REQ_SENT:
3176 case IB_CM_REP_RCVD:
3177 case IB_CM_MRA_REP_SENT:
3178 case IB_CM_REP_SENT:
3179 case IB_CM_MRA_REP_RCVD:
3180 case IB_CM_ESTABLISHED:
3181 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3182 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3183 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3184 qp_attr->path_mtu = cm_id_priv->path_mtu;
3185 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3186 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3187 if (cm_id_priv->qp_type == IB_QPT_RC) {
3188 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3189 IB_QP_MIN_RNR_TIMER;
3190 qp_attr->max_dest_rd_atomic =
3191 cm_id_priv->responder_resources;
3192 qp_attr->min_rnr_timer = 0;
3193 }
3194 if (cm_id_priv->alt_av.ah_attr.dlid) {
3195 *qp_attr_mask |= IB_QP_ALT_PATH;
3196 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3197 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3198 }
3199 ret = 0;
3200 break;
3201 default:
3202 ret = -EINVAL;
3203 break;
3204 }
3205 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3206 return ret;
3207 }
3208
3209 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3210 struct ib_qp_attr *qp_attr,
3211 int *qp_attr_mask)
3212 {
3213 unsigned long flags;
3214 int ret;
3215
3216 spin_lock_irqsave(&cm_id_priv->lock, flags);
3217 switch (cm_id_priv->id.state) {
3218 case IB_CM_REP_RCVD:
3219 case IB_CM_MRA_REP_SENT:
3220 case IB_CM_REP_SENT:
3221 case IB_CM_MRA_REP_RCVD:
3222 case IB_CM_ESTABLISHED:
3223 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3224 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3225 if (cm_id_priv->qp_type == IB_QPT_RC) {
3226 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3227 IB_QP_RNR_RETRY |
3228 IB_QP_MAX_QP_RD_ATOMIC;
3229 qp_attr->timeout = cm_id_priv->local_ack_timeout;
3230 qp_attr->retry_cnt = cm_id_priv->retry_count;
3231 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3232 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3233 }
3234 if (cm_id_priv->alt_av.ah_attr.dlid) {
3235 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3236 qp_attr->path_mig_state = IB_MIG_REARM;
3237 }
3238 ret = 0;
3239 break;
3240 default:
3241 ret = -EINVAL;
3242 break;
3243 }
3244 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3245 return ret;
3246 }
3247
3248 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3249 struct ib_qp_attr *qp_attr,
3250 int *qp_attr_mask)
3251 {
3252 struct cm_id_private *cm_id_priv;
3253 int ret;
3254
3255 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3256 switch (qp_attr->qp_state) {
3257 case IB_QPS_INIT:
3258 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3259 break;
3260 case IB_QPS_RTR:
3261 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3262 break;
3263 case IB_QPS_RTS:
3264 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3265 break;
3266 default:
3267 ret = -EINVAL;
3268 break;
3269 }
3270 return ret;
3271 }
3272 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3273
3274 static void cm_add_one(struct ib_device *device)
3275 {
3276 struct cm_device *cm_dev;
3277 struct cm_port *port;
3278 struct ib_mad_reg_req reg_req = {
3279 .mgmt_class = IB_MGMT_CLASS_CM,
3280 .mgmt_class_version = IB_CM_CLASS_VERSION
3281 };
3282 struct ib_port_modify port_modify = {
3283 .set_port_cap_mask = IB_PORT_CM_SUP
3284 };
3285 unsigned long flags;
3286 int ret;
3287 u8 i;
3288
3289 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3290 return;
3291
3292 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3293 device->phys_port_cnt, GFP_KERNEL);
3294 if (!cm_dev)
3295 return;
3296
3297 cm_dev->device = device;
3298 cm_dev->ca_guid = device->node_guid;
3299
3300 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3301 for (i = 1; i <= device->phys_port_cnt; i++) {
3302 port = &cm_dev->port[i-1];
3303 port->cm_dev = cm_dev;
3304 port->port_num = i;
3305 port->mad_agent = ib_register_mad_agent(device, i,
3306 IB_QPT_GSI,
3307 &reg_req,
3308 0,
3309 cm_send_handler,
3310 cm_recv_handler,
3311 port);
3312 if (IS_ERR(port->mad_agent))
3313 goto error1;
3314
3315 ret = ib_modify_port(device, i, 0, &port_modify);
3316 if (ret)
3317 goto error2;
3318 }
3319 ib_set_client_data(device, &cm_client, cm_dev);
3320
3321 write_lock_irqsave(&cm.device_lock, flags);
3322 list_add_tail(&cm_dev->list, &cm.device_list);
3323 write_unlock_irqrestore(&cm.device_lock, flags);
3324 return;
3325
3326 error2:
3327 ib_unregister_mad_agent(port->mad_agent);
3328 error1:
3329 port_modify.set_port_cap_mask = 0;
3330 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3331 while (--i) {
3332 port = &cm_dev->port[i-1];
3333 ib_modify_port(device, port->port_num, 0, &port_modify);
3334 ib_unregister_mad_agent(port->mad_agent);
3335 }
3336 kfree(cm_dev);
3337 }
3338
3339 static void cm_remove_one(struct ib_device *device)
3340 {
3341 struct cm_device *cm_dev;
3342 struct cm_port *port;
3343 struct ib_port_modify port_modify = {
3344 .clr_port_cap_mask = IB_PORT_CM_SUP
3345 };
3346 unsigned long flags;
3347 int i;
3348
3349 cm_dev = ib_get_client_data(device, &cm_client);
3350 if (!cm_dev)
3351 return;
3352
3353 write_lock_irqsave(&cm.device_lock, flags);
3354 list_del(&cm_dev->list);
3355 write_unlock_irqrestore(&cm.device_lock, flags);
3356
3357 for (i = 1; i <= device->phys_port_cnt; i++) {
3358 port = &cm_dev->port[i-1];
3359 ib_modify_port(device, port->port_num, 0, &port_modify);
3360 ib_unregister_mad_agent(port->mad_agent);
3361 }
3362 kfree(cm_dev);
3363 }
3364
3365 static int __init ib_cm_init(void)
3366 {
3367 int ret;
3368
3369 memset(&cm, 0, sizeof cm);
3370 INIT_LIST_HEAD(&cm.device_list);
3371 rwlock_init(&cm.device_lock);
3372 spin_lock_init(&cm.lock);
3373 cm.listen_service_table = RB_ROOT;
3374 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3375 cm.remote_id_table = RB_ROOT;
3376 cm.remote_qp_table = RB_ROOT;
3377 cm.remote_sidr_table = RB_ROOT;
3378 idr_init(&cm.local_id_table);
3379 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3380 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3381 INIT_LIST_HEAD(&cm.timewait_list);
3382
3383 cm.wq = create_workqueue("ib_cm");
3384 if (!cm.wq)
3385 return -ENOMEM;
3386
3387 ret = ib_register_client(&cm_client);
3388 if (ret)
3389 goto error;
3390
3391 return 0;
3392 error:
3393 destroy_workqueue(cm.wq);
3394 return ret;
3395 }
3396
3397 static void __exit ib_cm_cleanup(void)
3398 {
3399 struct cm_timewait_info *timewait_info, *tmp;
3400
3401 spin_lock_irq(&cm.lock);
3402 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3403 cancel_delayed_work(&timewait_info->work.work);
3404 spin_unlock_irq(&cm.lock);
3405
3406 destroy_workqueue(cm.wq);
3407
3408 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3409 list_del(&timewait_info->list);
3410 kfree(timewait_info);
3411 }
3412
3413 ib_unregister_client(&cm_client);
3414 idr_destroy(&cm.local_id_table);
3415 }
3416
3417 module_init(ib_cm_init);
3418 module_exit(ib_cm_cleanup);
3419
Linux kernel - Deliverables
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