Loading...
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/slab.h>
38#include <linux/bitops.h>
39#include <linux/random.h>
40
41#include <rdma/ib_cache.h>
42#include "sa.h"
43
44static void mcast_add_one(struct ib_device *device);
45static void mcast_remove_one(struct ib_device *device);
46
47static struct ib_client mcast_client = {
48 .name = "ib_multicast",
49 .add = mcast_add_one,
50 .remove = mcast_remove_one
51};
52
53static struct ib_sa_client sa_client;
54static struct workqueue_struct *mcast_wq;
55static union ib_gid mgid0;
56
57struct mcast_device;
58
59struct mcast_port {
60 struct mcast_device *dev;
61 spinlock_t lock;
62 struct rb_root table;
63 atomic_t refcount;
64 struct completion comp;
65 u8 port_num;
66};
67
68struct mcast_device {
69 struct ib_device *device;
70 struct ib_event_handler event_handler;
71 int start_port;
72 int end_port;
73 struct mcast_port port[0];
74};
75
76enum mcast_state {
77 MCAST_JOINING,
78 MCAST_MEMBER,
79 MCAST_ERROR,
80};
81
82enum mcast_group_state {
83 MCAST_IDLE,
84 MCAST_BUSY,
85 MCAST_GROUP_ERROR,
86 MCAST_PKEY_EVENT
87};
88
89enum {
90 MCAST_INVALID_PKEY_INDEX = 0xFFFF
91};
92
93struct mcast_member;
94
95struct mcast_group {
96 struct ib_sa_mcmember_rec rec;
97 struct rb_node node;
98 struct mcast_port *port;
99 spinlock_t lock;
100 struct work_struct work;
101 struct list_head pending_list;
102 struct list_head active_list;
103 struct mcast_member *last_join;
104 int members[3];
105 atomic_t refcount;
106 enum mcast_group_state state;
107 struct ib_sa_query *query;
108 int query_id;
109 u16 pkey_index;
110 u8 leave_state;
111 int retries;
112};
113
114struct mcast_member {
115 struct ib_sa_multicast multicast;
116 struct ib_sa_client *client;
117 struct mcast_group *group;
118 struct list_head list;
119 enum mcast_state state;
120 atomic_t refcount;
121 struct completion comp;
122};
123
124static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
125 void *context);
126static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
127 void *context);
128
129static struct mcast_group *mcast_find(struct mcast_port *port,
130 union ib_gid *mgid)
131{
132 struct rb_node *node = port->table.rb_node;
133 struct mcast_group *group;
134 int ret;
135
136 while (node) {
137 group = rb_entry(node, struct mcast_group, node);
138 ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid);
139 if (!ret)
140 return group;
141
142 if (ret < 0)
143 node = node->rb_left;
144 else
145 node = node->rb_right;
146 }
147 return NULL;
148}
149
150static struct mcast_group *mcast_insert(struct mcast_port *port,
151 struct mcast_group *group,
152 int allow_duplicates)
153{
154 struct rb_node **link = &port->table.rb_node;
155 struct rb_node *parent = NULL;
156 struct mcast_group *cur_group;
157 int ret;
158
159 while (*link) {
160 parent = *link;
161 cur_group = rb_entry(parent, struct mcast_group, node);
162
163 ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw,
164 sizeof group->rec.mgid);
165 if (ret < 0)
166 link = &(*link)->rb_left;
167 else if (ret > 0)
168 link = &(*link)->rb_right;
169 else if (allow_duplicates)
170 link = &(*link)->rb_left;
171 else
172 return cur_group;
173 }
174 rb_link_node(&group->node, parent, link);
175 rb_insert_color(&group->node, &port->table);
176 return NULL;
177}
178
179static void deref_port(struct mcast_port *port)
180{
181 if (atomic_dec_and_test(&port->refcount))
182 complete(&port->comp);
183}
184
185static void release_group(struct mcast_group *group)
186{
187 struct mcast_port *port = group->port;
188 unsigned long flags;
189
190 spin_lock_irqsave(&port->lock, flags);
191 if (atomic_dec_and_test(&group->refcount)) {
192 rb_erase(&group->node, &port->table);
193 spin_unlock_irqrestore(&port->lock, flags);
194 kfree(group);
195 deref_port(port);
196 } else
197 spin_unlock_irqrestore(&port->lock, flags);
198}
199
200static void deref_member(struct mcast_member *member)
201{
202 if (atomic_dec_and_test(&member->refcount))
203 complete(&member->comp);
204}
205
206static void queue_join(struct mcast_member *member)
207{
208 struct mcast_group *group = member->group;
209 unsigned long flags;
210
211 spin_lock_irqsave(&group->lock, flags);
212 list_add_tail(&member->list, &group->pending_list);
213 if (group->state == MCAST_IDLE) {
214 group->state = MCAST_BUSY;
215 atomic_inc(&group->refcount);
216 queue_work(mcast_wq, &group->work);
217 }
218 spin_unlock_irqrestore(&group->lock, flags);
219}
220
221/*
222 * A multicast group has three types of members: full member, non member, and
223 * send only member. We need to keep track of the number of members of each
224 * type based on their join state. Adjust the number of members the belong to
225 * the specified join states.
226 */
227static void adjust_membership(struct mcast_group *group, u8 join_state, int inc)
228{
229 int i;
230
231 for (i = 0; i < 3; i++, join_state >>= 1)
232 if (join_state & 0x1)
233 group->members[i] += inc;
234}
235
236/*
237 * If a multicast group has zero members left for a particular join state, but
238 * the group is still a member with the SA, we need to leave that join state.
239 * Determine which join states we still belong to, but that do not have any
240 * active members.
241 */
242static u8 get_leave_state(struct mcast_group *group)
243{
244 u8 leave_state = 0;
245 int i;
246
247 for (i = 0; i < 3; i++)
248 if (!group->members[i])
249 leave_state |= (0x1 << i);
250
251 return leave_state & group->rec.join_state;
252}
253
254static int check_selector(ib_sa_comp_mask comp_mask,
255 ib_sa_comp_mask selector_mask,
256 ib_sa_comp_mask value_mask,
257 u8 selector, u8 src_value, u8 dst_value)
258{
259 int err;
260
261 if (!(comp_mask & selector_mask) || !(comp_mask & value_mask))
262 return 0;
263
264 switch (selector) {
265 case IB_SA_GT:
266 err = (src_value <= dst_value);
267 break;
268 case IB_SA_LT:
269 err = (src_value >= dst_value);
270 break;
271 case IB_SA_EQ:
272 err = (src_value != dst_value);
273 break;
274 default:
275 err = 0;
276 break;
277 }
278
279 return err;
280}
281
282static int cmp_rec(struct ib_sa_mcmember_rec *src,
283 struct ib_sa_mcmember_rec *dst, ib_sa_comp_mask comp_mask)
284{
285 /* MGID must already match */
286
287 if (comp_mask & IB_SA_MCMEMBER_REC_PORT_GID &&
288 memcmp(&src->port_gid, &dst->port_gid, sizeof src->port_gid))
289 return -EINVAL;
290 if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey)
291 return -EINVAL;
292 if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid)
293 return -EINVAL;
294 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR,
295 IB_SA_MCMEMBER_REC_MTU, dst->mtu_selector,
296 src->mtu, dst->mtu))
297 return -EINVAL;
298 if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS &&
299 src->traffic_class != dst->traffic_class)
300 return -EINVAL;
301 if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey)
302 return -EINVAL;
303 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR,
304 IB_SA_MCMEMBER_REC_RATE, dst->rate_selector,
305 src->rate, dst->rate))
306 return -EINVAL;
307 if (check_selector(comp_mask,
308 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR,
309 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME,
310 dst->packet_life_time_selector,
311 src->packet_life_time, dst->packet_life_time))
312 return -EINVAL;
313 if (comp_mask & IB_SA_MCMEMBER_REC_SL && src->sl != dst->sl)
314 return -EINVAL;
315 if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL &&
316 src->flow_label != dst->flow_label)
317 return -EINVAL;
318 if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT &&
319 src->hop_limit != dst->hop_limit)
320 return -EINVAL;
321 if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && src->scope != dst->scope)
322 return -EINVAL;
323
324 /* join_state checked separately, proxy_join ignored */
325
326 return 0;
327}
328
329static int send_join(struct mcast_group *group, struct mcast_member *member)
330{
331 struct mcast_port *port = group->port;
332 int ret;
333
334 group->last_join = member;
335 ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
336 port->port_num, IB_MGMT_METHOD_SET,
337 &member->multicast.rec,
338 member->multicast.comp_mask,
339 3000, GFP_KERNEL, join_handler, group,
340 &group->query);
341 if (ret >= 0) {
342 group->query_id = ret;
343 ret = 0;
344 }
345 return ret;
346}
347
348static int send_leave(struct mcast_group *group, u8 leave_state)
349{
350 struct mcast_port *port = group->port;
351 struct ib_sa_mcmember_rec rec;
352 int ret;
353
354 rec = group->rec;
355 rec.join_state = leave_state;
356 group->leave_state = leave_state;
357
358 ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
359 port->port_num, IB_SA_METHOD_DELETE, &rec,
360 IB_SA_MCMEMBER_REC_MGID |
361 IB_SA_MCMEMBER_REC_PORT_GID |
362 IB_SA_MCMEMBER_REC_JOIN_STATE,
363 3000, GFP_KERNEL, leave_handler,
364 group, &group->query);
365 if (ret >= 0) {
366 group->query_id = ret;
367 ret = 0;
368 }
369 return ret;
370}
371
372static void join_group(struct mcast_group *group, struct mcast_member *member,
373 u8 join_state)
374{
375 member->state = MCAST_MEMBER;
376 adjust_membership(group, join_state, 1);
377 group->rec.join_state |= join_state;
378 member->multicast.rec = group->rec;
379 member->multicast.rec.join_state = join_state;
380 list_move(&member->list, &group->active_list);
381}
382
383static int fail_join(struct mcast_group *group, struct mcast_member *member,
384 int status)
385{
386 spin_lock_irq(&group->lock);
387 list_del_init(&member->list);
388 spin_unlock_irq(&group->lock);
389 return member->multicast.callback(status, &member->multicast);
390}
391
392static void process_group_error(struct mcast_group *group)
393{
394 struct mcast_member *member;
395 int ret = 0;
396 u16 pkey_index;
397
398 if (group->state == MCAST_PKEY_EVENT)
399 ret = ib_find_pkey(group->port->dev->device,
400 group->port->port_num,
401 be16_to_cpu(group->rec.pkey), &pkey_index);
402
403 spin_lock_irq(&group->lock);
404 if (group->state == MCAST_PKEY_EVENT && !ret &&
405 group->pkey_index == pkey_index)
406 goto out;
407
408 while (!list_empty(&group->active_list)) {
409 member = list_entry(group->active_list.next,
410 struct mcast_member, list);
411 atomic_inc(&member->refcount);
412 list_del_init(&member->list);
413 adjust_membership(group, member->multicast.rec.join_state, -1);
414 member->state = MCAST_ERROR;
415 spin_unlock_irq(&group->lock);
416
417 ret = member->multicast.callback(-ENETRESET,
418 &member->multicast);
419 deref_member(member);
420 if (ret)
421 ib_sa_free_multicast(&member->multicast);
422 spin_lock_irq(&group->lock);
423 }
424
425 group->rec.join_state = 0;
426out:
427 group->state = MCAST_BUSY;
428 spin_unlock_irq(&group->lock);
429}
430
431static void mcast_work_handler(struct work_struct *work)
432{
433 struct mcast_group *group;
434 struct mcast_member *member;
435 struct ib_sa_multicast *multicast;
436 int status, ret;
437 u8 join_state;
438
439 group = container_of(work, typeof(*group), work);
440retest:
441 spin_lock_irq(&group->lock);
442 while (!list_empty(&group->pending_list) ||
443 (group->state != MCAST_BUSY)) {
444
445 if (group->state != MCAST_BUSY) {
446 spin_unlock_irq(&group->lock);
447 process_group_error(group);
448 goto retest;
449 }
450
451 member = list_entry(group->pending_list.next,
452 struct mcast_member, list);
453 multicast = &member->multicast;
454 join_state = multicast->rec.join_state;
455 atomic_inc(&member->refcount);
456
457 if (join_state == (group->rec.join_state & join_state)) {
458 status = cmp_rec(&group->rec, &multicast->rec,
459 multicast->comp_mask);
460 if (!status)
461 join_group(group, member, join_state);
462 else
463 list_del_init(&member->list);
464 spin_unlock_irq(&group->lock);
465 ret = multicast->callback(status, multicast);
466 } else {
467 spin_unlock_irq(&group->lock);
468 status = send_join(group, member);
469 if (!status) {
470 deref_member(member);
471 return;
472 }
473 ret = fail_join(group, member, status);
474 }
475
476 deref_member(member);
477 if (ret)
478 ib_sa_free_multicast(&member->multicast);
479 spin_lock_irq(&group->lock);
480 }
481
482 join_state = get_leave_state(group);
483 if (join_state) {
484 group->rec.join_state &= ~join_state;
485 spin_unlock_irq(&group->lock);
486 if (send_leave(group, join_state))
487 goto retest;
488 } else {
489 group->state = MCAST_IDLE;
490 spin_unlock_irq(&group->lock);
491 release_group(group);
492 }
493}
494
495/*
496 * Fail a join request if it is still active - at the head of the pending queue.
497 */
498static void process_join_error(struct mcast_group *group, int status)
499{
500 struct mcast_member *member;
501 int ret;
502
503 spin_lock_irq(&group->lock);
504 member = list_entry(group->pending_list.next,
505 struct mcast_member, list);
506 if (group->last_join == member) {
507 atomic_inc(&member->refcount);
508 list_del_init(&member->list);
509 spin_unlock_irq(&group->lock);
510 ret = member->multicast.callback(status, &member->multicast);
511 deref_member(member);
512 if (ret)
513 ib_sa_free_multicast(&member->multicast);
514 } else
515 spin_unlock_irq(&group->lock);
516}
517
518static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
519 void *context)
520{
521 struct mcast_group *group = context;
522 u16 pkey_index = MCAST_INVALID_PKEY_INDEX;
523
524 if (status)
525 process_join_error(group, status);
526 else {
527 ib_find_pkey(group->port->dev->device, group->port->port_num,
528 be16_to_cpu(rec->pkey), &pkey_index);
529
530 spin_lock_irq(&group->port->lock);
531 group->rec = *rec;
532 if (group->state == MCAST_BUSY &&
533 group->pkey_index == MCAST_INVALID_PKEY_INDEX)
534 group->pkey_index = pkey_index;
535 if (!memcmp(&mgid0, &group->rec.mgid, sizeof mgid0)) {
536 rb_erase(&group->node, &group->port->table);
537 mcast_insert(group->port, group, 1);
538 }
539 spin_unlock_irq(&group->port->lock);
540 }
541 mcast_work_handler(&group->work);
542}
543
544static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
545 void *context)
546{
547 struct mcast_group *group = context;
548
549 if (status && group->retries > 0 &&
550 !send_leave(group, group->leave_state))
551 group->retries--;
552 else
553 mcast_work_handler(&group->work);
554}
555
556static struct mcast_group *acquire_group(struct mcast_port *port,
557 union ib_gid *mgid, gfp_t gfp_mask)
558{
559 struct mcast_group *group, *cur_group;
560 unsigned long flags;
561 int is_mgid0;
562
563 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
564 if (!is_mgid0) {
565 spin_lock_irqsave(&port->lock, flags);
566 group = mcast_find(port, mgid);
567 if (group)
568 goto found;
569 spin_unlock_irqrestore(&port->lock, flags);
570 }
571
572 group = kzalloc(sizeof *group, gfp_mask);
573 if (!group)
574 return NULL;
575
576 group->retries = 3;
577 group->port = port;
578 group->rec.mgid = *mgid;
579 group->pkey_index = MCAST_INVALID_PKEY_INDEX;
580 INIT_LIST_HEAD(&group->pending_list);
581 INIT_LIST_HEAD(&group->active_list);
582 INIT_WORK(&group->work, mcast_work_handler);
583 spin_lock_init(&group->lock);
584
585 spin_lock_irqsave(&port->lock, flags);
586 cur_group = mcast_insert(port, group, is_mgid0);
587 if (cur_group) {
588 kfree(group);
589 group = cur_group;
590 } else
591 atomic_inc(&port->refcount);
592found:
593 atomic_inc(&group->refcount);
594 spin_unlock_irqrestore(&port->lock, flags);
595 return group;
596}
597
598/*
599 * We serialize all join requests to a single group to make our lives much
600 * easier. Otherwise, two users could try to join the same group
601 * simultaneously, with different configurations, one could leave while the
602 * join is in progress, etc., which makes locking around error recovery
603 * difficult.
604 */
605struct ib_sa_multicast *
606ib_sa_join_multicast(struct ib_sa_client *client,
607 struct ib_device *device, u8 port_num,
608 struct ib_sa_mcmember_rec *rec,
609 ib_sa_comp_mask comp_mask, gfp_t gfp_mask,
610 int (*callback)(int status,
611 struct ib_sa_multicast *multicast),
612 void *context)
613{
614 struct mcast_device *dev;
615 struct mcast_member *member;
616 struct ib_sa_multicast *multicast;
617 int ret;
618
619 dev = ib_get_client_data(device, &mcast_client);
620 if (!dev)
621 return ERR_PTR(-ENODEV);
622
623 member = kmalloc(sizeof *member, gfp_mask);
624 if (!member)
625 return ERR_PTR(-ENOMEM);
626
627 ib_sa_client_get(client);
628 member->client = client;
629 member->multicast.rec = *rec;
630 member->multicast.comp_mask = comp_mask;
631 member->multicast.callback = callback;
632 member->multicast.context = context;
633 init_completion(&member->comp);
634 atomic_set(&member->refcount, 1);
635 member->state = MCAST_JOINING;
636
637 member->group = acquire_group(&dev->port[port_num - dev->start_port],
638 &rec->mgid, gfp_mask);
639 if (!member->group) {
640 ret = -ENOMEM;
641 goto err;
642 }
643
644 /*
645 * The user will get the multicast structure in their callback. They
646 * could then free the multicast structure before we can return from
647 * this routine. So we save the pointer to return before queuing
648 * any callback.
649 */
650 multicast = &member->multicast;
651 queue_join(member);
652 return multicast;
653
654err:
655 ib_sa_client_put(client);
656 kfree(member);
657 return ERR_PTR(ret);
658}
659EXPORT_SYMBOL(ib_sa_join_multicast);
660
661void ib_sa_free_multicast(struct ib_sa_multicast *multicast)
662{
663 struct mcast_member *member;
664 struct mcast_group *group;
665
666 member = container_of(multicast, struct mcast_member, multicast);
667 group = member->group;
668
669 spin_lock_irq(&group->lock);
670 if (member->state == MCAST_MEMBER)
671 adjust_membership(group, multicast->rec.join_state, -1);
672
673 list_del_init(&member->list);
674
675 if (group->state == MCAST_IDLE) {
676 group->state = MCAST_BUSY;
677 spin_unlock_irq(&group->lock);
678 /* Continue to hold reference on group until callback */
679 queue_work(mcast_wq, &group->work);
680 } else {
681 spin_unlock_irq(&group->lock);
682 release_group(group);
683 }
684
685 deref_member(member);
686 wait_for_completion(&member->comp);
687 ib_sa_client_put(member->client);
688 kfree(member);
689}
690EXPORT_SYMBOL(ib_sa_free_multicast);
691
692int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num,
693 union ib_gid *mgid, struct ib_sa_mcmember_rec *rec)
694{
695 struct mcast_device *dev;
696 struct mcast_port *port;
697 struct mcast_group *group;
698 unsigned long flags;
699 int ret = 0;
700
701 dev = ib_get_client_data(device, &mcast_client);
702 if (!dev)
703 return -ENODEV;
704
705 port = &dev->port[port_num - dev->start_port];
706 spin_lock_irqsave(&port->lock, flags);
707 group = mcast_find(port, mgid);
708 if (group)
709 *rec = group->rec;
710 else
711 ret = -EADDRNOTAVAIL;
712 spin_unlock_irqrestore(&port->lock, flags);
713
714 return ret;
715}
716EXPORT_SYMBOL(ib_sa_get_mcmember_rec);
717
718int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num,
719 struct ib_sa_mcmember_rec *rec,
720 struct ib_ah_attr *ah_attr)
721{
722 int ret;
723 u16 gid_index;
724 u8 p;
725
726 ret = ib_find_cached_gid(device, &rec->port_gid, &p, &gid_index);
727 if (ret)
728 return ret;
729
730 memset(ah_attr, 0, sizeof *ah_attr);
731 ah_attr->dlid = be16_to_cpu(rec->mlid);
732 ah_attr->sl = rec->sl;
733 ah_attr->port_num = port_num;
734 ah_attr->static_rate = rec->rate;
735
736 ah_attr->ah_flags = IB_AH_GRH;
737 ah_attr->grh.dgid = rec->mgid;
738
739 ah_attr->grh.sgid_index = (u8) gid_index;
740 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
741 ah_attr->grh.hop_limit = rec->hop_limit;
742 ah_attr->grh.traffic_class = rec->traffic_class;
743
744 return 0;
745}
746EXPORT_SYMBOL(ib_init_ah_from_mcmember);
747
748static void mcast_groups_event(struct mcast_port *port,
749 enum mcast_group_state state)
750{
751 struct mcast_group *group;
752 struct rb_node *node;
753 unsigned long flags;
754
755 spin_lock_irqsave(&port->lock, flags);
756 for (node = rb_first(&port->table); node; node = rb_next(node)) {
757 group = rb_entry(node, struct mcast_group, node);
758 spin_lock(&group->lock);
759 if (group->state == MCAST_IDLE) {
760 atomic_inc(&group->refcount);
761 queue_work(mcast_wq, &group->work);
762 }
763 if (group->state != MCAST_GROUP_ERROR)
764 group->state = state;
765 spin_unlock(&group->lock);
766 }
767 spin_unlock_irqrestore(&port->lock, flags);
768}
769
770static void mcast_event_handler(struct ib_event_handler *handler,
771 struct ib_event *event)
772{
773 struct mcast_device *dev;
774 int index;
775
776 dev = container_of(handler, struct mcast_device, event_handler);
777 if (rdma_port_get_link_layer(dev->device, event->element.port_num) !=
778 IB_LINK_LAYER_INFINIBAND)
779 return;
780
781 index = event->element.port_num - dev->start_port;
782
783 switch (event->event) {
784 case IB_EVENT_PORT_ERR:
785 case IB_EVENT_LID_CHANGE:
786 case IB_EVENT_SM_CHANGE:
787 case IB_EVENT_CLIENT_REREGISTER:
788 mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR);
789 break;
790 case IB_EVENT_PKEY_CHANGE:
791 mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT);
792 break;
793 default:
794 break;
795 }
796}
797
798static void mcast_add_one(struct ib_device *device)
799{
800 struct mcast_device *dev;
801 struct mcast_port *port;
802 int i;
803 int count = 0;
804
805 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
806 return;
807
808 dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
809 GFP_KERNEL);
810 if (!dev)
811 return;
812
813 if (device->node_type == RDMA_NODE_IB_SWITCH)
814 dev->start_port = dev->end_port = 0;
815 else {
816 dev->start_port = 1;
817 dev->end_port = device->phys_port_cnt;
818 }
819
820 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
821 if (rdma_port_get_link_layer(device, dev->start_port + i) !=
822 IB_LINK_LAYER_INFINIBAND)
823 continue;
824 port = &dev->port[i];
825 port->dev = dev;
826 port->port_num = dev->start_port + i;
827 spin_lock_init(&port->lock);
828 port->table = RB_ROOT;
829 init_completion(&port->comp);
830 atomic_set(&port->refcount, 1);
831 ++count;
832 }
833
834 if (!count) {
835 kfree(dev);
836 return;
837 }
838
839 dev->device = device;
840 ib_set_client_data(device, &mcast_client, dev);
841
842 INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler);
843 ib_register_event_handler(&dev->event_handler);
844}
845
846static void mcast_remove_one(struct ib_device *device)
847{
848 struct mcast_device *dev;
849 struct mcast_port *port;
850 int i;
851
852 dev = ib_get_client_data(device, &mcast_client);
853 if (!dev)
854 return;
855
856 ib_unregister_event_handler(&dev->event_handler);
857 flush_workqueue(mcast_wq);
858
859 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
860 if (rdma_port_get_link_layer(device, dev->start_port + i) ==
861 IB_LINK_LAYER_INFINIBAND) {
862 port = &dev->port[i];
863 deref_port(port);
864 wait_for_completion(&port->comp);
865 }
866 }
867
868 kfree(dev);
869}
870
871int mcast_init(void)
872{
873 int ret;
874
875 mcast_wq = create_singlethread_workqueue("ib_mcast");
876 if (!mcast_wq)
877 return -ENOMEM;
878
879 ib_sa_register_client(&sa_client);
880
881 ret = ib_register_client(&mcast_client);
882 if (ret)
883 goto err;
884 return 0;
885
886err:
887 ib_sa_unregister_client(&sa_client);
888 destroy_workqueue(mcast_wq);
889 return ret;
890}
891
892void mcast_cleanup(void)
893{
894 ib_unregister_client(&mcast_client);
895 ib_sa_unregister_client(&sa_client);
896 destroy_workqueue(mcast_wq);
897}
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/export.h>
38#include <linux/slab.h>
39#include <linux/bitops.h>
40#include <linux/random.h>
41
42#include <rdma/ib_cache.h>
43#include "sa.h"
44
45static void mcast_add_one(struct ib_device *device);
46static void mcast_remove_one(struct ib_device *device);
47
48static struct ib_client mcast_client = {
49 .name = "ib_multicast",
50 .add = mcast_add_one,
51 .remove = mcast_remove_one
52};
53
54static struct ib_sa_client sa_client;
55static struct workqueue_struct *mcast_wq;
56static union ib_gid mgid0;
57
58struct mcast_device;
59
60struct mcast_port {
61 struct mcast_device *dev;
62 spinlock_t lock;
63 struct rb_root table;
64 atomic_t refcount;
65 struct completion comp;
66 u8 port_num;
67};
68
69struct mcast_device {
70 struct ib_device *device;
71 struct ib_event_handler event_handler;
72 int start_port;
73 int end_port;
74 struct mcast_port port[0];
75};
76
77enum mcast_state {
78 MCAST_JOINING,
79 MCAST_MEMBER,
80 MCAST_ERROR,
81};
82
83enum mcast_group_state {
84 MCAST_IDLE,
85 MCAST_BUSY,
86 MCAST_GROUP_ERROR,
87 MCAST_PKEY_EVENT
88};
89
90enum {
91 MCAST_INVALID_PKEY_INDEX = 0xFFFF
92};
93
94struct mcast_member;
95
96struct mcast_group {
97 struct ib_sa_mcmember_rec rec;
98 struct rb_node node;
99 struct mcast_port *port;
100 spinlock_t lock;
101 struct work_struct work;
102 struct list_head pending_list;
103 struct list_head active_list;
104 struct mcast_member *last_join;
105 int members[3];
106 atomic_t refcount;
107 enum mcast_group_state state;
108 struct ib_sa_query *query;
109 int query_id;
110 u16 pkey_index;
111 u8 leave_state;
112 int retries;
113};
114
115struct mcast_member {
116 struct ib_sa_multicast multicast;
117 struct ib_sa_client *client;
118 struct mcast_group *group;
119 struct list_head list;
120 enum mcast_state state;
121 atomic_t refcount;
122 struct completion comp;
123};
124
125static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
126 void *context);
127static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
128 void *context);
129
130static struct mcast_group *mcast_find(struct mcast_port *port,
131 union ib_gid *mgid)
132{
133 struct rb_node *node = port->table.rb_node;
134 struct mcast_group *group;
135 int ret;
136
137 while (node) {
138 group = rb_entry(node, struct mcast_group, node);
139 ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid);
140 if (!ret)
141 return group;
142
143 if (ret < 0)
144 node = node->rb_left;
145 else
146 node = node->rb_right;
147 }
148 return NULL;
149}
150
151static struct mcast_group *mcast_insert(struct mcast_port *port,
152 struct mcast_group *group,
153 int allow_duplicates)
154{
155 struct rb_node **link = &port->table.rb_node;
156 struct rb_node *parent = NULL;
157 struct mcast_group *cur_group;
158 int ret;
159
160 while (*link) {
161 parent = *link;
162 cur_group = rb_entry(parent, struct mcast_group, node);
163
164 ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw,
165 sizeof group->rec.mgid);
166 if (ret < 0)
167 link = &(*link)->rb_left;
168 else if (ret > 0)
169 link = &(*link)->rb_right;
170 else if (allow_duplicates)
171 link = &(*link)->rb_left;
172 else
173 return cur_group;
174 }
175 rb_link_node(&group->node, parent, link);
176 rb_insert_color(&group->node, &port->table);
177 return NULL;
178}
179
180static void deref_port(struct mcast_port *port)
181{
182 if (atomic_dec_and_test(&port->refcount))
183 complete(&port->comp);
184}
185
186static void release_group(struct mcast_group *group)
187{
188 struct mcast_port *port = group->port;
189 unsigned long flags;
190
191 spin_lock_irqsave(&port->lock, flags);
192 if (atomic_dec_and_test(&group->refcount)) {
193 rb_erase(&group->node, &port->table);
194 spin_unlock_irqrestore(&port->lock, flags);
195 kfree(group);
196 deref_port(port);
197 } else
198 spin_unlock_irqrestore(&port->lock, flags);
199}
200
201static void deref_member(struct mcast_member *member)
202{
203 if (atomic_dec_and_test(&member->refcount))
204 complete(&member->comp);
205}
206
207static void queue_join(struct mcast_member *member)
208{
209 struct mcast_group *group = member->group;
210 unsigned long flags;
211
212 spin_lock_irqsave(&group->lock, flags);
213 list_add_tail(&member->list, &group->pending_list);
214 if (group->state == MCAST_IDLE) {
215 group->state = MCAST_BUSY;
216 atomic_inc(&group->refcount);
217 queue_work(mcast_wq, &group->work);
218 }
219 spin_unlock_irqrestore(&group->lock, flags);
220}
221
222/*
223 * A multicast group has three types of members: full member, non member, and
224 * send only member. We need to keep track of the number of members of each
225 * type based on their join state. Adjust the number of members the belong to
226 * the specified join states.
227 */
228static void adjust_membership(struct mcast_group *group, u8 join_state, int inc)
229{
230 int i;
231
232 for (i = 0; i < 3; i++, join_state >>= 1)
233 if (join_state & 0x1)
234 group->members[i] += inc;
235}
236
237/*
238 * If a multicast group has zero members left for a particular join state, but
239 * the group is still a member with the SA, we need to leave that join state.
240 * Determine which join states we still belong to, but that do not have any
241 * active members.
242 */
243static u8 get_leave_state(struct mcast_group *group)
244{
245 u8 leave_state = 0;
246 int i;
247
248 for (i = 0; i < 3; i++)
249 if (!group->members[i])
250 leave_state |= (0x1 << i);
251
252 return leave_state & group->rec.join_state;
253}
254
255static int check_selector(ib_sa_comp_mask comp_mask,
256 ib_sa_comp_mask selector_mask,
257 ib_sa_comp_mask value_mask,
258 u8 selector, u8 src_value, u8 dst_value)
259{
260 int err;
261
262 if (!(comp_mask & selector_mask) || !(comp_mask & value_mask))
263 return 0;
264
265 switch (selector) {
266 case IB_SA_GT:
267 err = (src_value <= dst_value);
268 break;
269 case IB_SA_LT:
270 err = (src_value >= dst_value);
271 break;
272 case IB_SA_EQ:
273 err = (src_value != dst_value);
274 break;
275 default:
276 err = 0;
277 break;
278 }
279
280 return err;
281}
282
283static int cmp_rec(struct ib_sa_mcmember_rec *src,
284 struct ib_sa_mcmember_rec *dst, ib_sa_comp_mask comp_mask)
285{
286 /* MGID must already match */
287
288 if (comp_mask & IB_SA_MCMEMBER_REC_PORT_GID &&
289 memcmp(&src->port_gid, &dst->port_gid, sizeof src->port_gid))
290 return -EINVAL;
291 if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey)
292 return -EINVAL;
293 if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid)
294 return -EINVAL;
295 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR,
296 IB_SA_MCMEMBER_REC_MTU, dst->mtu_selector,
297 src->mtu, dst->mtu))
298 return -EINVAL;
299 if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS &&
300 src->traffic_class != dst->traffic_class)
301 return -EINVAL;
302 if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey)
303 return -EINVAL;
304 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR,
305 IB_SA_MCMEMBER_REC_RATE, dst->rate_selector,
306 src->rate, dst->rate))
307 return -EINVAL;
308 if (check_selector(comp_mask,
309 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR,
310 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME,
311 dst->packet_life_time_selector,
312 src->packet_life_time, dst->packet_life_time))
313 return -EINVAL;
314 if (comp_mask & IB_SA_MCMEMBER_REC_SL && src->sl != dst->sl)
315 return -EINVAL;
316 if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL &&
317 src->flow_label != dst->flow_label)
318 return -EINVAL;
319 if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT &&
320 src->hop_limit != dst->hop_limit)
321 return -EINVAL;
322 if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && src->scope != dst->scope)
323 return -EINVAL;
324
325 /* join_state checked separately, proxy_join ignored */
326
327 return 0;
328}
329
330static int send_join(struct mcast_group *group, struct mcast_member *member)
331{
332 struct mcast_port *port = group->port;
333 int ret;
334
335 group->last_join = member;
336 ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
337 port->port_num, IB_MGMT_METHOD_SET,
338 &member->multicast.rec,
339 member->multicast.comp_mask,
340 3000, GFP_KERNEL, join_handler, group,
341 &group->query);
342 if (ret >= 0) {
343 group->query_id = ret;
344 ret = 0;
345 }
346 return ret;
347}
348
349static int send_leave(struct mcast_group *group, u8 leave_state)
350{
351 struct mcast_port *port = group->port;
352 struct ib_sa_mcmember_rec rec;
353 int ret;
354
355 rec = group->rec;
356 rec.join_state = leave_state;
357 group->leave_state = leave_state;
358
359 ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
360 port->port_num, IB_SA_METHOD_DELETE, &rec,
361 IB_SA_MCMEMBER_REC_MGID |
362 IB_SA_MCMEMBER_REC_PORT_GID |
363 IB_SA_MCMEMBER_REC_JOIN_STATE,
364 3000, GFP_KERNEL, leave_handler,
365 group, &group->query);
366 if (ret >= 0) {
367 group->query_id = ret;
368 ret = 0;
369 }
370 return ret;
371}
372
373static void join_group(struct mcast_group *group, struct mcast_member *member,
374 u8 join_state)
375{
376 member->state = MCAST_MEMBER;
377 adjust_membership(group, join_state, 1);
378 group->rec.join_state |= join_state;
379 member->multicast.rec = group->rec;
380 member->multicast.rec.join_state = join_state;
381 list_move(&member->list, &group->active_list);
382}
383
384static int fail_join(struct mcast_group *group, struct mcast_member *member,
385 int status)
386{
387 spin_lock_irq(&group->lock);
388 list_del_init(&member->list);
389 spin_unlock_irq(&group->lock);
390 return member->multicast.callback(status, &member->multicast);
391}
392
393static void process_group_error(struct mcast_group *group)
394{
395 struct mcast_member *member;
396 int ret = 0;
397 u16 pkey_index;
398
399 if (group->state == MCAST_PKEY_EVENT)
400 ret = ib_find_pkey(group->port->dev->device,
401 group->port->port_num,
402 be16_to_cpu(group->rec.pkey), &pkey_index);
403
404 spin_lock_irq(&group->lock);
405 if (group->state == MCAST_PKEY_EVENT && !ret &&
406 group->pkey_index == pkey_index)
407 goto out;
408
409 while (!list_empty(&group->active_list)) {
410 member = list_entry(group->active_list.next,
411 struct mcast_member, list);
412 atomic_inc(&member->refcount);
413 list_del_init(&member->list);
414 adjust_membership(group, member->multicast.rec.join_state, -1);
415 member->state = MCAST_ERROR;
416 spin_unlock_irq(&group->lock);
417
418 ret = member->multicast.callback(-ENETRESET,
419 &member->multicast);
420 deref_member(member);
421 if (ret)
422 ib_sa_free_multicast(&member->multicast);
423 spin_lock_irq(&group->lock);
424 }
425
426 group->rec.join_state = 0;
427out:
428 group->state = MCAST_BUSY;
429 spin_unlock_irq(&group->lock);
430}
431
432static void mcast_work_handler(struct work_struct *work)
433{
434 struct mcast_group *group;
435 struct mcast_member *member;
436 struct ib_sa_multicast *multicast;
437 int status, ret;
438 u8 join_state;
439
440 group = container_of(work, typeof(*group), work);
441retest:
442 spin_lock_irq(&group->lock);
443 while (!list_empty(&group->pending_list) ||
444 (group->state != MCAST_BUSY)) {
445
446 if (group->state != MCAST_BUSY) {
447 spin_unlock_irq(&group->lock);
448 process_group_error(group);
449 goto retest;
450 }
451
452 member = list_entry(group->pending_list.next,
453 struct mcast_member, list);
454 multicast = &member->multicast;
455 join_state = multicast->rec.join_state;
456 atomic_inc(&member->refcount);
457
458 if (join_state == (group->rec.join_state & join_state)) {
459 status = cmp_rec(&group->rec, &multicast->rec,
460 multicast->comp_mask);
461 if (!status)
462 join_group(group, member, join_state);
463 else
464 list_del_init(&member->list);
465 spin_unlock_irq(&group->lock);
466 ret = multicast->callback(status, multicast);
467 } else {
468 spin_unlock_irq(&group->lock);
469 status = send_join(group, member);
470 if (!status) {
471 deref_member(member);
472 return;
473 }
474 ret = fail_join(group, member, status);
475 }
476
477 deref_member(member);
478 if (ret)
479 ib_sa_free_multicast(&member->multicast);
480 spin_lock_irq(&group->lock);
481 }
482
483 join_state = get_leave_state(group);
484 if (join_state) {
485 group->rec.join_state &= ~join_state;
486 spin_unlock_irq(&group->lock);
487 if (send_leave(group, join_state))
488 goto retest;
489 } else {
490 group->state = MCAST_IDLE;
491 spin_unlock_irq(&group->lock);
492 release_group(group);
493 }
494}
495
496/*
497 * Fail a join request if it is still active - at the head of the pending queue.
498 */
499static void process_join_error(struct mcast_group *group, int status)
500{
501 struct mcast_member *member;
502 int ret;
503
504 spin_lock_irq(&group->lock);
505 member = list_entry(group->pending_list.next,
506 struct mcast_member, list);
507 if (group->last_join == member) {
508 atomic_inc(&member->refcount);
509 list_del_init(&member->list);
510 spin_unlock_irq(&group->lock);
511 ret = member->multicast.callback(status, &member->multicast);
512 deref_member(member);
513 if (ret)
514 ib_sa_free_multicast(&member->multicast);
515 } else
516 spin_unlock_irq(&group->lock);
517}
518
519static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
520 void *context)
521{
522 struct mcast_group *group = context;
523 u16 pkey_index = MCAST_INVALID_PKEY_INDEX;
524
525 if (status)
526 process_join_error(group, status);
527 else {
528 ib_find_pkey(group->port->dev->device, group->port->port_num,
529 be16_to_cpu(rec->pkey), &pkey_index);
530
531 spin_lock_irq(&group->port->lock);
532 group->rec = *rec;
533 if (group->state == MCAST_BUSY &&
534 group->pkey_index == MCAST_INVALID_PKEY_INDEX)
535 group->pkey_index = pkey_index;
536 if (!memcmp(&mgid0, &group->rec.mgid, sizeof mgid0)) {
537 rb_erase(&group->node, &group->port->table);
538 mcast_insert(group->port, group, 1);
539 }
540 spin_unlock_irq(&group->port->lock);
541 }
542 mcast_work_handler(&group->work);
543}
544
545static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
546 void *context)
547{
548 struct mcast_group *group = context;
549
550 if (status && group->retries > 0 &&
551 !send_leave(group, group->leave_state))
552 group->retries--;
553 else
554 mcast_work_handler(&group->work);
555}
556
557static struct mcast_group *acquire_group(struct mcast_port *port,
558 union ib_gid *mgid, gfp_t gfp_mask)
559{
560 struct mcast_group *group, *cur_group;
561 unsigned long flags;
562 int is_mgid0;
563
564 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
565 if (!is_mgid0) {
566 spin_lock_irqsave(&port->lock, flags);
567 group = mcast_find(port, mgid);
568 if (group)
569 goto found;
570 spin_unlock_irqrestore(&port->lock, flags);
571 }
572
573 group = kzalloc(sizeof *group, gfp_mask);
574 if (!group)
575 return NULL;
576
577 group->retries = 3;
578 group->port = port;
579 group->rec.mgid = *mgid;
580 group->pkey_index = MCAST_INVALID_PKEY_INDEX;
581 INIT_LIST_HEAD(&group->pending_list);
582 INIT_LIST_HEAD(&group->active_list);
583 INIT_WORK(&group->work, mcast_work_handler);
584 spin_lock_init(&group->lock);
585
586 spin_lock_irqsave(&port->lock, flags);
587 cur_group = mcast_insert(port, group, is_mgid0);
588 if (cur_group) {
589 kfree(group);
590 group = cur_group;
591 } else
592 atomic_inc(&port->refcount);
593found:
594 atomic_inc(&group->refcount);
595 spin_unlock_irqrestore(&port->lock, flags);
596 return group;
597}
598
599/*
600 * We serialize all join requests to a single group to make our lives much
601 * easier. Otherwise, two users could try to join the same group
602 * simultaneously, with different configurations, one could leave while the
603 * join is in progress, etc., which makes locking around error recovery
604 * difficult.
605 */
606struct ib_sa_multicast *
607ib_sa_join_multicast(struct ib_sa_client *client,
608 struct ib_device *device, u8 port_num,
609 struct ib_sa_mcmember_rec *rec,
610 ib_sa_comp_mask comp_mask, gfp_t gfp_mask,
611 int (*callback)(int status,
612 struct ib_sa_multicast *multicast),
613 void *context)
614{
615 struct mcast_device *dev;
616 struct mcast_member *member;
617 struct ib_sa_multicast *multicast;
618 int ret;
619
620 dev = ib_get_client_data(device, &mcast_client);
621 if (!dev)
622 return ERR_PTR(-ENODEV);
623
624 member = kmalloc(sizeof *member, gfp_mask);
625 if (!member)
626 return ERR_PTR(-ENOMEM);
627
628 ib_sa_client_get(client);
629 member->client = client;
630 member->multicast.rec = *rec;
631 member->multicast.comp_mask = comp_mask;
632 member->multicast.callback = callback;
633 member->multicast.context = context;
634 init_completion(&member->comp);
635 atomic_set(&member->refcount, 1);
636 member->state = MCAST_JOINING;
637
638 member->group = acquire_group(&dev->port[port_num - dev->start_port],
639 &rec->mgid, gfp_mask);
640 if (!member->group) {
641 ret = -ENOMEM;
642 goto err;
643 }
644
645 /*
646 * The user will get the multicast structure in their callback. They
647 * could then free the multicast structure before we can return from
648 * this routine. So we save the pointer to return before queuing
649 * any callback.
650 */
651 multicast = &member->multicast;
652 queue_join(member);
653 return multicast;
654
655err:
656 ib_sa_client_put(client);
657 kfree(member);
658 return ERR_PTR(ret);
659}
660EXPORT_SYMBOL(ib_sa_join_multicast);
661
662void ib_sa_free_multicast(struct ib_sa_multicast *multicast)
663{
664 struct mcast_member *member;
665 struct mcast_group *group;
666
667 member = container_of(multicast, struct mcast_member, multicast);
668 group = member->group;
669
670 spin_lock_irq(&group->lock);
671 if (member->state == MCAST_MEMBER)
672 adjust_membership(group, multicast->rec.join_state, -1);
673
674 list_del_init(&member->list);
675
676 if (group->state == MCAST_IDLE) {
677 group->state = MCAST_BUSY;
678 spin_unlock_irq(&group->lock);
679 /* Continue to hold reference on group until callback */
680 queue_work(mcast_wq, &group->work);
681 } else {
682 spin_unlock_irq(&group->lock);
683 release_group(group);
684 }
685
686 deref_member(member);
687 wait_for_completion(&member->comp);
688 ib_sa_client_put(member->client);
689 kfree(member);
690}
691EXPORT_SYMBOL(ib_sa_free_multicast);
692
693int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num,
694 union ib_gid *mgid, struct ib_sa_mcmember_rec *rec)
695{
696 struct mcast_device *dev;
697 struct mcast_port *port;
698 struct mcast_group *group;
699 unsigned long flags;
700 int ret = 0;
701
702 dev = ib_get_client_data(device, &mcast_client);
703 if (!dev)
704 return -ENODEV;
705
706 port = &dev->port[port_num - dev->start_port];
707 spin_lock_irqsave(&port->lock, flags);
708 group = mcast_find(port, mgid);
709 if (group)
710 *rec = group->rec;
711 else
712 ret = -EADDRNOTAVAIL;
713 spin_unlock_irqrestore(&port->lock, flags);
714
715 return ret;
716}
717EXPORT_SYMBOL(ib_sa_get_mcmember_rec);
718
719int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num,
720 struct ib_sa_mcmember_rec *rec,
721 struct ib_ah_attr *ah_attr)
722{
723 int ret;
724 u16 gid_index;
725 u8 p;
726
727 ret = ib_find_cached_gid(device, &rec->port_gid, &p, &gid_index);
728 if (ret)
729 return ret;
730
731 memset(ah_attr, 0, sizeof *ah_attr);
732 ah_attr->dlid = be16_to_cpu(rec->mlid);
733 ah_attr->sl = rec->sl;
734 ah_attr->port_num = port_num;
735 ah_attr->static_rate = rec->rate;
736
737 ah_attr->ah_flags = IB_AH_GRH;
738 ah_attr->grh.dgid = rec->mgid;
739
740 ah_attr->grh.sgid_index = (u8) gid_index;
741 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
742 ah_attr->grh.hop_limit = rec->hop_limit;
743 ah_attr->grh.traffic_class = rec->traffic_class;
744
745 return 0;
746}
747EXPORT_SYMBOL(ib_init_ah_from_mcmember);
748
749static void mcast_groups_event(struct mcast_port *port,
750 enum mcast_group_state state)
751{
752 struct mcast_group *group;
753 struct rb_node *node;
754 unsigned long flags;
755
756 spin_lock_irqsave(&port->lock, flags);
757 for (node = rb_first(&port->table); node; node = rb_next(node)) {
758 group = rb_entry(node, struct mcast_group, node);
759 spin_lock(&group->lock);
760 if (group->state == MCAST_IDLE) {
761 atomic_inc(&group->refcount);
762 queue_work(mcast_wq, &group->work);
763 }
764 if (group->state != MCAST_GROUP_ERROR)
765 group->state = state;
766 spin_unlock(&group->lock);
767 }
768 spin_unlock_irqrestore(&port->lock, flags);
769}
770
771static void mcast_event_handler(struct ib_event_handler *handler,
772 struct ib_event *event)
773{
774 struct mcast_device *dev;
775 int index;
776
777 dev = container_of(handler, struct mcast_device, event_handler);
778 if (rdma_port_get_link_layer(dev->device, event->element.port_num) !=
779 IB_LINK_LAYER_INFINIBAND)
780 return;
781
782 index = event->element.port_num - dev->start_port;
783
784 switch (event->event) {
785 case IB_EVENT_PORT_ERR:
786 case IB_EVENT_LID_CHANGE:
787 case IB_EVENT_SM_CHANGE:
788 case IB_EVENT_CLIENT_REREGISTER:
789 mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR);
790 break;
791 case IB_EVENT_PKEY_CHANGE:
792 mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT);
793 break;
794 default:
795 break;
796 }
797}
798
799static void mcast_add_one(struct ib_device *device)
800{
801 struct mcast_device *dev;
802 struct mcast_port *port;
803 int i;
804 int count = 0;
805
806 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
807 return;
808
809 dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
810 GFP_KERNEL);
811 if (!dev)
812 return;
813
814 if (device->node_type == RDMA_NODE_IB_SWITCH)
815 dev->start_port = dev->end_port = 0;
816 else {
817 dev->start_port = 1;
818 dev->end_port = device->phys_port_cnt;
819 }
820
821 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
822 if (rdma_port_get_link_layer(device, dev->start_port + i) !=
823 IB_LINK_LAYER_INFINIBAND)
824 continue;
825 port = &dev->port[i];
826 port->dev = dev;
827 port->port_num = dev->start_port + i;
828 spin_lock_init(&port->lock);
829 port->table = RB_ROOT;
830 init_completion(&port->comp);
831 atomic_set(&port->refcount, 1);
832 ++count;
833 }
834
835 if (!count) {
836 kfree(dev);
837 return;
838 }
839
840 dev->device = device;
841 ib_set_client_data(device, &mcast_client, dev);
842
843 INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler);
844 ib_register_event_handler(&dev->event_handler);
845}
846
847static void mcast_remove_one(struct ib_device *device)
848{
849 struct mcast_device *dev;
850 struct mcast_port *port;
851 int i;
852
853 dev = ib_get_client_data(device, &mcast_client);
854 if (!dev)
855 return;
856
857 ib_unregister_event_handler(&dev->event_handler);
858 flush_workqueue(mcast_wq);
859
860 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
861 if (rdma_port_get_link_layer(device, dev->start_port + i) ==
862 IB_LINK_LAYER_INFINIBAND) {
863 port = &dev->port[i];
864 deref_port(port);
865 wait_for_completion(&port->comp);
866 }
867 }
868
869 kfree(dev);
870}
871
872int mcast_init(void)
873{
874 int ret;
875
876 mcast_wq = create_singlethread_workqueue("ib_mcast");
877 if (!mcast_wq)
878 return -ENOMEM;
879
880 ib_sa_register_client(&sa_client);
881
882 ret = ib_register_client(&mcast_client);
883 if (ret)
884 goto err;
885 return 0;
886
887err:
888 ib_sa_unregister_client(&sa_client);
889 destroy_workqueue(mcast_wq);
890 return ret;
891}
892
893void mcast_cleanup(void)
894{
895 ib_unregister_client(&mcast_client);
896 ib_sa_unregister_client(&sa_client);
897 destroy_workqueue(mcast_wq);
898}