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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / infiniband / core / multicast.c
blob107f170c57cdb12cc05786551b21d29b01ecc6de
1 /*
2 * Copyright (c) 2006 Intel Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <linux/completion.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/err.h>
36 #include <linux/interrupt.h>
37 #include <linux/bitops.h>
38 #include <linux/random.h>
39
40 #include <rdma/ib_cache.h>
41 #include "sa.h"
42
43 static void mcast_add_one(struct ib_device *device);
44 static void mcast_remove_one(struct ib_device *device);
45
46 static struct ib_client mcast_client = {
47 .name = "ib_multicast",
48 .add = mcast_add_one,
49 .remove = mcast_remove_one
50 };
51
52 static struct ib_sa_client sa_client;
53 static struct workqueue_struct *mcast_wq;
54 static union ib_gid mgid0;
55
56 struct mcast_device;
57
58 struct mcast_port {
59 struct mcast_device *dev;
60 spinlock_t lock;
61 struct rb_root table;
62 atomic_t refcount;
63 struct completion comp;
64 u8 port_num;
65 };
66
67 struct mcast_device {
68 struct ib_device *device;
69 struct ib_event_handler event_handler;
70 int start_port;
71 int end_port;
72 struct mcast_port port[0];
73 };
74
75 enum mcast_state {
76 MCAST_JOINING,
77 MCAST_MEMBER,
78 MCAST_ERROR,
79 };
80
81 enum mcast_group_state {
82 MCAST_IDLE,
83 MCAST_BUSY,
84 MCAST_GROUP_ERROR,
85 MCAST_PKEY_EVENT
86 };
87
88 enum {
89 MCAST_INVALID_PKEY_INDEX = 0xFFFF
90 };
91
92 struct mcast_member;
93
94 struct mcast_group {
95 struct ib_sa_mcmember_rec rec;
96 struct rb_node node;
97 struct mcast_port *port;
98 spinlock_t lock;
99 struct work_struct work;
100 struct list_head pending_list;
101 struct list_head active_list;
102 struct mcast_member *last_join;
103 int members[3];
104 atomic_t refcount;
105 enum mcast_group_state state;
106 struct ib_sa_query *query;
107 int query_id;
108 u16 pkey_index;
109 };
110
111 struct mcast_member {
112 struct ib_sa_multicast multicast;
113 struct ib_sa_client *client;
114 struct mcast_group *group;
115 struct list_head list;
116 enum mcast_state state;
117 atomic_t refcount;
118 struct completion comp;
119 };
120
121 static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
122 void *context);
123 static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
124 void *context);
125
126 static struct mcast_group *mcast_find(struct mcast_port *port,
127 union ib_gid *mgid)
128 {
129 struct rb_node *node = port->table.rb_node;
130 struct mcast_group *group;
131 int ret;
132
133 while (node) {
134 group = rb_entry(node, struct mcast_group, node);
135 ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid);
136 if (!ret)
137 return group;
138
139 if (ret < 0)
140 node = node->rb_left;
141 else
142 node = node->rb_right;
143 }
144 return NULL;
145 }
146
147 static struct mcast_group *mcast_insert(struct mcast_port *port,
148 struct mcast_group *group,
149 int allow_duplicates)
150 {
151 struct rb_node **link = &port->table.rb_node;
152 struct rb_node *parent = NULL;
153 struct mcast_group *cur_group;
154 int ret;
155
156 while (*link) {
157 parent = *link;
158 cur_group = rb_entry(parent, struct mcast_group, node);
159
160 ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw,
161 sizeof group->rec.mgid);
162 if (ret < 0)
163 link = &(*link)->rb_left;
164 else if (ret > 0)
165 link = &(*link)->rb_right;
166 else if (allow_duplicates)
167 link = &(*link)->rb_left;
168 else
169 return cur_group;
170 }
171 rb_link_node(&group->node, parent, link);
172 rb_insert_color(&group->node, &port->table);
173 return NULL;
174 }
175
176 static void deref_port(struct mcast_port *port)
177 {
178 if (atomic_dec_and_test(&port->refcount))
179 complete(&port->comp);
180 }
181
182 static void release_group(struct mcast_group *group)
183 {
184 struct mcast_port *port = group->port;
185 unsigned long flags;
186
187 spin_lock_irqsave(&port->lock, flags);
188 if (atomic_dec_and_test(&group->refcount)) {
189 rb_erase(&group->node, &port->table);
190 spin_unlock_irqrestore(&port->lock, flags);
191 kfree(group);
192 deref_port(port);
193 } else
194 spin_unlock_irqrestore(&port->lock, flags);
195 }
196
197 static void deref_member(struct mcast_member *member)
198 {
199 if (atomic_dec_and_test(&member->refcount))
200 complete(&member->comp);
201 }
202
203 static void queue_join(struct mcast_member *member)
204 {
205 struct mcast_group *group = member->group;
206 unsigned long flags;
207
208 spin_lock_irqsave(&group->lock, flags);
209 list_add_tail(&member->list, &group->pending_list);
210 if (group->state == MCAST_IDLE) {
211 group->state = MCAST_BUSY;
212 atomic_inc(&group->refcount);
213 queue_work(mcast_wq, &group->work);
214 }
215 spin_unlock_irqrestore(&group->lock, flags);
216 }
217
218 /*
219 * A multicast group has three types of members: full member, non member, and
220 * send only member. We need to keep track of the number of members of each
221 * type based on their join state. Adjust the number of members the belong to
222 * the specified join states.
223 */
224 static void adjust_membership(struct mcast_group *group, u8 join_state, int inc)
225 {
226 int i;
227
228 for (i = 0; i < 3; i++, join_state >>= 1)
229 if (join_state & 0x1)
230 group->members[i] += inc;
231 }
232
233 /*
234 * If a multicast group has zero members left for a particular join state, but
235 * the group is still a member with the SA, we need to leave that join state.
236 * Determine which join states we still belong to, but that do not have any
237 * active members.
238 */
239 static u8 get_leave_state(struct mcast_group *group)
240 {
241 u8 leave_state = 0;
242 int i;
243
244 for (i = 0; i < 3; i++)
245 if (!group->members[i])
246 leave_state |= (0x1 << i);
247
248 return leave_state & group->rec.join_state;
249 }
250
251 static int check_selector(ib_sa_comp_mask comp_mask,
252 ib_sa_comp_mask selector_mask,
253 ib_sa_comp_mask value_mask,
254 u8 selector, u8 src_value, u8 dst_value)
255 {
256 int err;
257
258 if (!(comp_mask & selector_mask) || !(comp_mask & value_mask))
259 return 0;
260
261 switch (selector) {
262 case IB_SA_GT:
263 err = (src_value <= dst_value);
264 break;
265 case IB_SA_LT:
266 err = (src_value >= dst_value);
267 break;
268 case IB_SA_EQ:
269 err = (src_value != dst_value);
270 break;
271 default:
272 err = 0;
273 break;
274 }
275
276 return err;
277 }
278
279 static int cmp_rec(struct ib_sa_mcmember_rec *src,
280 struct ib_sa_mcmember_rec *dst, ib_sa_comp_mask comp_mask)
281 {
282 /* MGID must already match */
283
284 if (comp_mask & IB_SA_MCMEMBER_REC_PORT_GID &&
285 memcmp(&src->port_gid, &dst->port_gid, sizeof src->port_gid))
286 return -EINVAL;
287 if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey)
288 return -EINVAL;
289 if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid)
290 return -EINVAL;
291 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR,
292 IB_SA_MCMEMBER_REC_MTU, dst->mtu_selector,
293 src->mtu, dst->mtu))
294 return -EINVAL;
295 if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS &&
296 src->traffic_class != dst->traffic_class)
297 return -EINVAL;
298 if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey)
299 return -EINVAL;
300 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR,
301 IB_SA_MCMEMBER_REC_RATE, dst->rate_selector,
302 src->rate, dst->rate))
303 return -EINVAL;
304 if (check_selector(comp_mask,
305 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR,
306 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME,
307 dst->packet_life_time_selector,
308 src->packet_life_time, dst->packet_life_time))
309 return -EINVAL;
310 if (comp_mask & IB_SA_MCMEMBER_REC_SL && src->sl != dst->sl)
311 return -EINVAL;
312 if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL &&
313 src->flow_label != dst->flow_label)
314 return -EINVAL;
315 if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT &&
316 src->hop_limit != dst->hop_limit)
317 return -EINVAL;
318 if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && src->scope != dst->scope)
319 return -EINVAL;
320
321 /* join_state checked separately, proxy_join ignored */
322
323 return 0;
324 }
325
326 static int send_join(struct mcast_group *group, struct mcast_member *member)
327 {
328 struct mcast_port *port = group->port;
329 int ret;
330
331 group->last_join = member;
332 ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
333 port->port_num, IB_MGMT_METHOD_SET,
334 &member->multicast.rec,
335 member->multicast.comp_mask,
336 3000, GFP_KERNEL, join_handler, group,
337 &group->query);
338 if (ret >= 0) {
339 group->query_id = ret;
340 ret = 0;
341 }
342 return ret;
343 }
344
345 static int send_leave(struct mcast_group *group, u8 leave_state)
346 {
347 struct mcast_port *port = group->port;
348 struct ib_sa_mcmember_rec rec;
349 int ret;
350
351 rec = group->rec;
352 rec.join_state = leave_state;
353
354 ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
355 port->port_num, IB_SA_METHOD_DELETE, &rec,
356 IB_SA_MCMEMBER_REC_MGID |
357 IB_SA_MCMEMBER_REC_PORT_GID |
358 IB_SA_MCMEMBER_REC_JOIN_STATE,
359 3000, GFP_KERNEL, leave_handler,
360 group, &group->query);
361 if (ret >= 0) {
362 group->query_id = ret;
363 ret = 0;
364 }
365 return ret;
366 }
367
368 static void join_group(struct mcast_group *group, struct mcast_member *member,
369 u8 join_state)
370 {
371 member->state = MCAST_MEMBER;
372 adjust_membership(group, join_state, 1);
373 group->rec.join_state |= join_state;
374 member->multicast.rec = group->rec;
375 member->multicast.rec.join_state = join_state;
376 list_move(&member->list, &group->active_list);
377 }
378
379 static int fail_join(struct mcast_group *group, struct mcast_member *member,
380 int status)
381 {
382 spin_lock_irq(&group->lock);
383 list_del_init(&member->list);
384 spin_unlock_irq(&group->lock);
385 return member->multicast.callback(status, &member->multicast);
386 }
387
388 static void process_group_error(struct mcast_group *group)
389 {
390 struct mcast_member *member;
391 int ret = 0;
392 u16 pkey_index;
393
394 if (group->state == MCAST_PKEY_EVENT)
395 ret = ib_find_pkey(group->port->dev->device,
396 group->port->port_num,
397 be16_to_cpu(group->rec.pkey), &pkey_index);
398
399 spin_lock_irq(&group->lock);
400 if (group->state == MCAST_PKEY_EVENT && !ret &&
401 group->pkey_index == pkey_index)
402 goto out;
403
404 while (!list_empty(&group->active_list)) {
405 member = list_entry(group->active_list.next,
406 struct mcast_member, list);
407 atomic_inc(&member->refcount);
408 list_del_init(&member->list);
409 adjust_membership(group, member->multicast.rec.join_state, -1);
410 member->state = MCAST_ERROR;
411 spin_unlock_irq(&group->lock);
412
413 ret = member->multicast.callback(-ENETRESET,
414 &member->multicast);
415 deref_member(member);
416 if (ret)
417 ib_sa_free_multicast(&member->multicast);
418 spin_lock_irq(&group->lock);
419 }
420
421 group->rec.join_state = 0;
422 out:
423 group->state = MCAST_BUSY;
424 spin_unlock_irq(&group->lock);
425 }
426
427 static void mcast_work_handler(struct work_struct *work)
428 {
429 struct mcast_group *group;
430 struct mcast_member *member;
431 struct ib_sa_multicast *multicast;
432 int status, ret;
433 u8 join_state;
434
435 group = container_of(work, typeof(*group), work);
436 retest:
437 spin_lock_irq(&group->lock);
438 while (!list_empty(&group->pending_list) ||
439 (group->state != MCAST_BUSY)) {
440
441 if (group->state != MCAST_BUSY) {
442 spin_unlock_irq(&group->lock);
443 process_group_error(group);
444 goto retest;
445 }
446
447 member = list_entry(group->pending_list.next,
448 struct mcast_member, list);
449 multicast = &member->multicast;
450 join_state = multicast->rec.join_state;
451 atomic_inc(&member->refcount);
452
453 if (join_state == (group->rec.join_state & join_state)) {
454 status = cmp_rec(&group->rec, &multicast->rec,
455 multicast->comp_mask);
456 if (!status)
457 join_group(group, member, join_state);
458 else
459 list_del_init(&member->list);
460 spin_unlock_irq(&group->lock);
461 ret = multicast->callback(status, multicast);
462 } else {
463 spin_unlock_irq(&group->lock);
464 status = send_join(group, member);
465 if (!status) {
466 deref_member(member);
467 return;
468 }
469 ret = fail_join(group, member, status);
470 }
471
472 deref_member(member);
473 if (ret)
474 ib_sa_free_multicast(&member->multicast);
475 spin_lock_irq(&group->lock);
476 }
477
478 join_state = get_leave_state(group);
479 if (join_state) {
480 group->rec.join_state &= ~join_state;
481 spin_unlock_irq(&group->lock);
482 if (send_leave(group, join_state))
483 goto retest;
484 } else {
485 group->state = MCAST_IDLE;
486 spin_unlock_irq(&group->lock);
487 release_group(group);
488 }
489 }
490
491 /*
492 * Fail a join request if it is still active - at the head of the pending queue.
493 */
494 static void process_join_error(struct mcast_group *group, int status)
495 {
496 struct mcast_member *member;
497 int ret;
498
499 spin_lock_irq(&group->lock);
500 member = list_entry(group->pending_list.next,
501 struct mcast_member, list);
502 if (group->last_join == member) {
503 atomic_inc(&member->refcount);
504 list_del_init(&member->list);
505 spin_unlock_irq(&group->lock);
506 ret = member->multicast.callback(status, &member->multicast);
507 deref_member(member);
508 if (ret)
509 ib_sa_free_multicast(&member->multicast);
510 } else
511 spin_unlock_irq(&group->lock);
512 }
513
514 static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
515 void *context)
516 {
517 struct mcast_group *group = context;
518 u16 pkey_index = MCAST_INVALID_PKEY_INDEX;
519
520 if (status)
521 process_join_error(group, status);
522 else {
523 ib_find_pkey(group->port->dev->device, group->port->port_num,
524 be16_to_cpu(rec->pkey), &pkey_index);
525
526 spin_lock_irq(&group->port->lock);
527 group->rec = *rec;
528 if (group->state == MCAST_BUSY &&
529 group->pkey_index == MCAST_INVALID_PKEY_INDEX)
530 group->pkey_index = pkey_index;
531 if (!memcmp(&mgid0, &group->rec.mgid, sizeof mgid0)) {
532 rb_erase(&group->node, &group->port->table);
533 mcast_insert(group->port, group, 1);
534 }
535 spin_unlock_irq(&group->port->lock);
536 }
537 mcast_work_handler(&group->work);
538 }
539
540 static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
541 void *context)
542 {
543 struct mcast_group *group = context;
544
545 mcast_work_handler(&group->work);
546 }
547
548 static struct mcast_group *acquire_group(struct mcast_port *port,
549 union ib_gid *mgid, gfp_t gfp_mask)
550 {
551 struct mcast_group *group, *cur_group;
552 unsigned long flags;
553 int is_mgid0;
554
555 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
556 if (!is_mgid0) {
557 spin_lock_irqsave(&port->lock, flags);
558 group = mcast_find(port, mgid);
559 if (group)
560 goto found;
561 spin_unlock_irqrestore(&port->lock, flags);
562 }
563
564 group = kzalloc(sizeof *group, gfp_mask);
565 if (!group)
566 return NULL;
567
568 group->port = port;
569 group->rec.mgid = *mgid;
570 group->pkey_index = MCAST_INVALID_PKEY_INDEX;
571 INIT_LIST_HEAD(&group->pending_list);
572 INIT_LIST_HEAD(&group->active_list);
573 INIT_WORK(&group->work, mcast_work_handler);
574 spin_lock_init(&group->lock);
575
576 spin_lock_irqsave(&port->lock, flags);
577 cur_group = mcast_insert(port, group, is_mgid0);
578 if (cur_group) {
579 kfree(group);
580 group = cur_group;
581 } else
582 atomic_inc(&port->refcount);
583 found:
584 atomic_inc(&group->refcount);
585 spin_unlock_irqrestore(&port->lock, flags);
586 return group;
587 }
588
589 /*
590 * We serialize all join requests to a single group to make our lives much
591 * easier. Otherwise, two users could try to join the same group
592 * simultaneously, with different configurations, one could leave while the
593 * join is in progress, etc., which makes locking around error recovery
594 * difficult.
595 */
596 struct ib_sa_multicast *
597 ib_sa_join_multicast(struct ib_sa_client *client,
598 struct ib_device *device, u8 port_num,
599 struct ib_sa_mcmember_rec *rec,
600 ib_sa_comp_mask comp_mask, gfp_t gfp_mask,
601 int (*callback)(int status,
602 struct ib_sa_multicast *multicast),
603 void *context)
604 {
605 struct mcast_device *dev;
606 struct mcast_member *member;
607 struct ib_sa_multicast *multicast;
608 int ret;
609
610 dev = ib_get_client_data(device, &mcast_client);
611 if (!dev)
612 return ERR_PTR(-ENODEV);
613
614 member = kmalloc(sizeof *member, gfp_mask);
615 if (!member)
616 return ERR_PTR(-ENOMEM);
617
618 ib_sa_client_get(client);
619 member->client = client;
620 member->multicast.rec = *rec;
621 member->multicast.comp_mask = comp_mask;
622 member->multicast.callback = callback;
623 member->multicast.context = context;
624 init_completion(&member->comp);
625 atomic_set(&member->refcount, 1);
626 member->state = MCAST_JOINING;
627
628 member->group = acquire_group(&dev->port[port_num - dev->start_port],
629 &rec->mgid, gfp_mask);
630 if (!member->group) {
631 ret = -ENOMEM;
632 goto err;
633 }
634
635 /*
636 * The user will get the multicast structure in their callback. They
637 * could then free the multicast structure before we can return from
638 * this routine. So we save the pointer to return before queuing
639 * any callback.
640 */
641 multicast = &member->multicast;
642 queue_join(member);
643 return multicast;
644
645 err:
646 ib_sa_client_put(client);
647 kfree(member);
648 return ERR_PTR(ret);
649 }
650 EXPORT_SYMBOL(ib_sa_join_multicast);
651
652 void ib_sa_free_multicast(struct ib_sa_multicast *multicast)
653 {
654 struct mcast_member *member;
655 struct mcast_group *group;
656
657 member = container_of(multicast, struct mcast_member, multicast);
658 group = member->group;
659
660 spin_lock_irq(&group->lock);
661 if (member->state == MCAST_MEMBER)
662 adjust_membership(group, multicast->rec.join_state, -1);
663
664 list_del_init(&member->list);
665
666 if (group->state == MCAST_IDLE) {
667 group->state = MCAST_BUSY;
668 spin_unlock_irq(&group->lock);
669 /* Continue to hold reference on group until callback */
670 queue_work(mcast_wq, &group->work);
671 } else {
672 spin_unlock_irq(&group->lock);
673 release_group(group);
674 }
675
676 deref_member(member);
677 wait_for_completion(&member->comp);
678 ib_sa_client_put(member->client);
679 kfree(member);
680 }
681 EXPORT_SYMBOL(ib_sa_free_multicast);
682
683 int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num,
684 union ib_gid *mgid, struct ib_sa_mcmember_rec *rec)
685 {
686 struct mcast_device *dev;
687 struct mcast_port *port;
688 struct mcast_group *group;
689 unsigned long flags;
690 int ret = 0;
691
692 dev = ib_get_client_data(device, &mcast_client);
693 if (!dev)
694 return -ENODEV;
695
696 port = &dev->port[port_num - dev->start_port];
697 spin_lock_irqsave(&port->lock, flags);
698 group = mcast_find(port, mgid);
699 if (group)
700 *rec = group->rec;
701 else
702 ret = -EADDRNOTAVAIL;
703 spin_unlock_irqrestore(&port->lock, flags);
704
705 return ret;
706 }
707 EXPORT_SYMBOL(ib_sa_get_mcmember_rec);
708
709 int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num,
710 struct ib_sa_mcmember_rec *rec,
711 struct ib_ah_attr *ah_attr)
712 {
713 int ret;
714 u16 gid_index;
715 u8 p;
716
717 ret = ib_find_cached_gid(device, &rec->port_gid, &p, &gid_index);
718 if (ret)
719 return ret;
720
721 memset(ah_attr, 0, sizeof *ah_attr);
722 ah_attr->dlid = be16_to_cpu(rec->mlid);
723 ah_attr->sl = rec->sl;
724 ah_attr->port_num = port_num;
725 ah_attr->static_rate = rec->rate;
726
727 ah_attr->ah_flags = IB_AH_GRH;
728 ah_attr->grh.dgid = rec->mgid;
729
730 ah_attr->grh.sgid_index = (u8) gid_index;
731 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
732 ah_attr->grh.hop_limit = rec->hop_limit;
733 ah_attr->grh.traffic_class = rec->traffic_class;
734
735 return 0;
736 }
737 EXPORT_SYMBOL(ib_init_ah_from_mcmember);
738
739 static void mcast_groups_event(struct mcast_port *port,
740 enum mcast_group_state state)
741 {
742 struct mcast_group *group;
743 struct rb_node *node;
744 unsigned long flags;
745
746 spin_lock_irqsave(&port->lock, flags);
747 for (node = rb_first(&port->table); node; node = rb_next(node)) {
748 group = rb_entry(node, struct mcast_group, node);
749 spin_lock(&group->lock);
750 if (group->state == MCAST_IDLE) {
751 atomic_inc(&group->refcount);
752 queue_work(mcast_wq, &group->work);
753 }
754 if (group->state != MCAST_GROUP_ERROR)
755 group->state = state;
756 spin_unlock(&group->lock);
757 }
758 spin_unlock_irqrestore(&port->lock, flags);
759 }
760
761 static void mcast_event_handler(struct ib_event_handler *handler,
762 struct ib_event *event)
763 {
764 struct mcast_device *dev;
765 int index;
766
767 dev = container_of(handler, struct mcast_device, event_handler);
768 index = event->element.port_num - dev->start_port;
769
770 switch (event->event) {
771 case IB_EVENT_PORT_ERR:
772 case IB_EVENT_LID_CHANGE:
773 case IB_EVENT_SM_CHANGE:
774 case IB_EVENT_CLIENT_REREGISTER:
775 mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR);
776 break;
777 case IB_EVENT_PKEY_CHANGE:
778 mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT);
779 break;
780 default:
781 break;
782 }
783 }
784
785 static void mcast_add_one(struct ib_device *device)
786 {
787 struct mcast_device *dev;
788 struct mcast_port *port;
789 int i;
790
791 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
792 return;
793
794 dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
795 GFP_KERNEL);
796 if (!dev)
797 return;
798
799 if (device->node_type == RDMA_NODE_IB_SWITCH)
800 dev->start_port = dev->end_port = 0;
801 else {
802 dev->start_port = 1;
803 dev->end_port = device->phys_port_cnt;
804 }
805
806 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
807 port = &dev->port[i];
808 port->dev = dev;
809 port->port_num = dev->start_port + i;
810 spin_lock_init(&port->lock);
811 port->table = RB_ROOT;
812 init_completion(&port->comp);
813 atomic_set(&port->refcount, 1);
814 }
815
816 dev->device = device;
817 ib_set_client_data(device, &mcast_client, dev);
818
819 INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler);
820 ib_register_event_handler(&dev->event_handler);
821 }
822
823 static void mcast_remove_one(struct ib_device *device)
824 {
825 struct mcast_device *dev;
826 struct mcast_port *port;
827 int i;
828
829 dev = ib_get_client_data(device, &mcast_client);
830 if (!dev)
831 return;
832
833 ib_unregister_event_handler(&dev->event_handler);
834 flush_workqueue(mcast_wq);
835
836 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
837 port = &dev->port[i];
838 deref_port(port);
839 wait_for_completion(&port->comp);
840 }
841
842 kfree(dev);
843 }
844
845 int mcast_init(void)
846 {
847 int ret;
848
849 mcast_wq = create_singlethread_workqueue("ib_mcast");
850 if (!mcast_wq)
851 return -ENOMEM;
852
853 ib_sa_register_client(&sa_client);
854
855 ret = ib_register_client(&mcast_client);
856 if (ret)
857 goto err;
858 return 0;
859
860 err:
861 ib_sa_unregister_client(&sa_client);
862 destroy_workqueue(mcast_wq);
863 return ret;
864 }
865
866 void mcast_cleanup(void)
867 {
868 ib_unregister_client(&mcast_client);
869 ib_sa_unregister_client(&sa_client);
870 destroy_workqueue(mcast_wq);
871 }
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