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IB/core: Add netdev and gid attributes paramteres to cache
[linux-2.6-block.git] / drivers / infiniband / core / multicast.c
CommitLineData
faec2f7b 1/*
43506d95 2 * Copyright (c) 2006 Intel Corporation. All rights reserved.
faec2f7b
SH		 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>
b108d976 37#include <linux/export.h>
5a0e3ad6 38#include <linux/slab.h>
faec2f7b
SH		 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);
7c1eb45a 46static void mcast_remove_one(struct ib_device *device, void *client_data);
faec2f7b
SH		 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 {
faec2f7b
SH		 78 MCAST_JOINING,
79 MCAST_MEMBER,
547af765
SH		 80 MCAST_ERROR,
81};
82
83enum mcast_group_state {
84 MCAST_IDLE,
faec2f7b 85 MCAST_BUSY,
547af765
SH		 86 MCAST_GROUP_ERROR,
87 MCAST_PKEY_EVENT
88};
89
90enum {
91 MCAST_INVALID_PKEY_INDEX = 0xFFFF
faec2f7b
SH		 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;
547af765 107 enum mcast_group_state state;
faec2f7b
SH		 108 struct ib_sa_query *query;
109 int query_id;
547af765 110 u16 pkey_index;
e1d7806d
YE		 111 u8 leave_state;
112 int retries;
faec2f7b
SH		 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);
57cb61d5 213 list_add_tail(&member->list, &group->pending_list);
faec2f7b
SH		 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;
e1d7806d 357 group->leave_state = leave_state;
faec2f7b
SH		 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;
547af765
SH		 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);
faec2f7b
SH		 403
404 spin_lock_irq(&group->lock);
547af765
SH		 405 if (group->state == MCAST_PKEY_EVENT && !ret &&
406 group->pkey_index == pkey_index)
407 goto out;
408
faec2f7b
SH		 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;
547af765 427out:
faec2f7b
SH		 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) ||
547af765 444 (group->state != MCAST_BUSY)) {
faec2f7b 445
547af765 446 if (group->state != MCAST_BUSY) {
faec2f7b
SH		 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;
547af765 523 u16 pkey_index = MCAST_INVALID_PKEY_INDEX;
faec2f7b
SH		 524
525 if (status)
526 process_join_error(group, status);
527 else {
514f3ddf 528 int mgids_changed, is_mgid0;
547af765
SH		 529 ib_find_pkey(group->port->dev->device, group->port->port_num,
530 be16_to_cpu(rec->pkey), &pkey_index);
531
faec2f7b 532 spin_lock_irq(&group->port->lock);
547af765
SH		 533 if (group->state == MCAST_BUSY &&
534 group->pkey_index == MCAST_INVALID_PKEY_INDEX)
535 group->pkey_index = pkey_index;
514f3ddf
JM		 536 mgids_changed = memcmp(&rec->mgid, &group->rec.mgid,
537 sizeof(group->rec.mgid));
538 group->rec = *rec;
539 if (mgids_changed) {
faec2f7b 540 rb_erase(&group->node, &group->port->table);
514f3ddf
JM		 541 is_mgid0 = !memcmp(&mgid0, &group->rec.mgid,
542 sizeof(mgid0));
543 mcast_insert(group->port, group, is_mgid0);
faec2f7b
SH		 544 }
545 spin_unlock_irq(&group->port->lock);
546 }
547 mcast_work_handler(&group->work);
548}
549
550static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
551 void *context)
552{
553 struct mcast_group *group = context;
554
e1d7806d
YE		 555 if (status && group->retries > 0 &&
556 !send_leave(group, group->leave_state))
557 group->retries--;
558 else
559 mcast_work_handler(&group->work);
faec2f7b
SH		 560}
561
562static struct mcast_group *acquire_group(struct mcast_port *port,
563 union ib_gid *mgid, gfp_t gfp_mask)
564{
565 struct mcast_group *group, *cur_group;
566 unsigned long flags;
567 int is_mgid0;
568
569 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
570 if (!is_mgid0) {
571 spin_lock_irqsave(&port->lock, flags);
572 group = mcast_find(port, mgid);
573 if (group)
574 goto found;
575 spin_unlock_irqrestore(&port->lock, flags);
576 }
577
578 group = kzalloc(sizeof *group, gfp_mask);
579 if (!group)
580 return NULL;
581
e1d7806d 582 group->retries = 3;
faec2f7b
SH		 583 group->port = port;
584 group->rec.mgid = *mgid;
547af765 585 group->pkey_index = MCAST_INVALID_PKEY_INDEX;
faec2f7b
SH		 586 INIT_LIST_HEAD(&group->pending_list);
587 INIT_LIST_HEAD(&group->active_list);
588 INIT_WORK(&group->work, mcast_work_handler);
589 spin_lock_init(&group->lock);
590
591 spin_lock_irqsave(&port->lock, flags);
592 cur_group = mcast_insert(port, group, is_mgid0);
593 if (cur_group) {
594 kfree(group);
595 group = cur_group;
596 } else
597 atomic_inc(&port->refcount);
598found:
599 atomic_inc(&group->refcount);
600 spin_unlock_irqrestore(&port->lock, flags);
601 return group;
602}
603
604/*
605 * We serialize all join requests to a single group to make our lives much
606 * easier. Otherwise, two users could try to join the same group
607 * simultaneously, with different configurations, one could leave while the
608 * join is in progress, etc., which makes locking around error recovery
609 * difficult.
610 */
611struct ib_sa_multicast *
612ib_sa_join_multicast(struct ib_sa_client *client,
613 struct ib_device *device, u8 port_num,
614 struct ib_sa_mcmember_rec *rec,
615 ib_sa_comp_mask comp_mask, gfp_t gfp_mask,
616 int (*callback)(int status,
617 struct ib_sa_multicast *multicast),
618 void *context)
619{
620 struct mcast_device *dev;
621 struct mcast_member *member;
622 struct ib_sa_multicast *multicast;
623 int ret;
624
625 dev = ib_get_client_data(device, &mcast_client);
626 if (!dev)
627 return ERR_PTR(-ENODEV);
628
629 member = kmalloc(sizeof *member, gfp_mask);
630 if (!member)
631 return ERR_PTR(-ENOMEM);
632
633 ib_sa_client_get(client);
634 member->client = client;
635 member->multicast.rec = *rec;
636 member->multicast.comp_mask = comp_mask;
637 member->multicast.callback = callback;
638 member->multicast.context = context;
639 init_completion(&member->comp);
640 atomic_set(&member->refcount, 1);
641 member->state = MCAST_JOINING;
642
643 member->group = acquire_group(&dev->port[port_num - dev->start_port],
644 &rec->mgid, gfp_mask);
645 if (!member->group) {
646 ret = -ENOMEM;
647 goto err;
648 }
649
650 /*
651 * The user will get the multicast structure in their callback. They
652 * could then free the multicast structure before we can return from
653 * this routine. So we save the pointer to return before queuing
654 * any callback.
655 */
656 multicast = &member->multicast;
657 queue_join(member);
658 return multicast;
659
660err:
661 ib_sa_client_put(client);
662 kfree(member);
663 return ERR_PTR(ret);
664}
665EXPORT_SYMBOL(ib_sa_join_multicast);
666
667void ib_sa_free_multicast(struct ib_sa_multicast *multicast)
668{
669 struct mcast_member *member;
670 struct mcast_group *group;
671
672 member = container_of(multicast, struct mcast_member, multicast);
673 group = member->group;
674
675 spin_lock_irq(&group->lock);
676 if (member->state == MCAST_MEMBER)
677 adjust_membership(group, multicast->rec.join_state, -1);
678
679 list_del_init(&member->list);
680
681 if (group->state == MCAST_IDLE) {
682 group->state = MCAST_BUSY;
683 spin_unlock_irq(&group->lock);
684 /* Continue to hold reference on group until callback */
685 queue_work(mcast_wq, &group->work);
686 } else {
687 spin_unlock_irq(&group->lock);
688 release_group(group);
689 }
690
691 deref_member(member);
692 wait_for_completion(&member->comp);
693 ib_sa_client_put(member->client);
694 kfree(member);
695}
696EXPORT_SYMBOL(ib_sa_free_multicast);
697
698int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num,
699 union ib_gid *mgid, struct ib_sa_mcmember_rec *rec)
700{
701 struct mcast_device *dev;
702 struct mcast_port *port;
703 struct mcast_group *group;
704 unsigned long flags;
705 int ret = 0;
706
707 dev = ib_get_client_data(device, &mcast_client);
708 if (!dev)
709 return -ENODEV;
710
711 port = &dev->port[port_num - dev->start_port];
712 spin_lock_irqsave(&port->lock, flags);
713 group = mcast_find(port, mgid);
714 if (group)
715 *rec = group->rec;
716 else
717 ret = -EADDRNOTAVAIL;
718 spin_unlock_irqrestore(&port->lock, flags);
719
720 return ret;
721}
722EXPORT_SYMBOL(ib_sa_get_mcmember_rec);
723
724int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num,
725 struct ib_sa_mcmember_rec *rec,
726 struct ib_ah_attr *ah_attr)
727{
728 int ret;
729 u16 gid_index;
730 u8 p;
731
55ee3ab2
MB		 732 ret = ib_find_cached_gid(device, &rec->port_gid,
733 NULL, &p, &gid_index);
faec2f7b
SH		 734 if (ret)
735 return ret;
736
737 memset(ah_attr, 0, sizeof *ah_attr);
738 ah_attr->dlid = be16_to_cpu(rec->mlid);
739 ah_attr->sl = rec->sl;
740 ah_attr->port_num = port_num;
741 ah_attr->static_rate = rec->rate;
742
743 ah_attr->ah_flags = IB_AH_GRH;
744 ah_attr->grh.dgid = rec->mgid;
745
746 ah_attr->grh.sgid_index = (u8) gid_index;
747 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
748 ah_attr->grh.hop_limit = rec->hop_limit;
749 ah_attr->grh.traffic_class = rec->traffic_class;
750
751 return 0;
752}
753EXPORT_SYMBOL(ib_init_ah_from_mcmember);
754
547af765
SH		 755static void mcast_groups_event(struct mcast_port *port,
756 enum mcast_group_state state)
faec2f7b
SH		 757{
758 struct mcast_group *group;
759 struct rb_node *node;
760 unsigned long flags;
761
762 spin_lock_irqsave(&port->lock, flags);
763 for (node = rb_first(&port->table); node; node = rb_next(node)) {
764 group = rb_entry(node, struct mcast_group, node);
765 spin_lock(&group->lock);
766 if (group->state == MCAST_IDLE) {
767 atomic_inc(&group->refcount);
768 queue_work(mcast_wq, &group->work);
769 }
547af765
SH		 770 if (group->state != MCAST_GROUP_ERROR)
771 group->state = state;
faec2f7b
SH		 772 spin_unlock(&group->lock);
773 }
774 spin_unlock_irqrestore(&port->lock, flags);
775}
776
777static void mcast_event_handler(struct ib_event_handler *handler,
778 struct ib_event *event)
779{
780 struct mcast_device *dev;
547af765 781 int index;
faec2f7b
SH		 782
783 dev = container_of(handler, struct mcast_device, event_handler);
9247a8eb 784 if (!rdma_cap_ib_mcast(dev->device, event->element.port_num))
fac70d51
EC		 785 return;
786
547af765 787 index = event->element.port_num - dev->start_port;
faec2f7b
SH		 788
789 switch (event->event) {
790 case IB_EVENT_PORT_ERR:
791 case IB_EVENT_LID_CHANGE:
792 case IB_EVENT_SM_CHANGE:
793 case IB_EVENT_CLIENT_REREGISTER:
547af765
SH		 794 mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR);
795 break;
796 case IB_EVENT_PKEY_CHANGE:
797 mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT);
faec2f7b
SH		 798 break;
799 default:
800 break;
801 }
802}
803
804static void mcast_add_one(struct ib_device *device)
805{
806 struct mcast_device *dev;
807 struct mcast_port *port;
808 int i;
fac70d51 809 int count = 0;
faec2f7b 810
faec2f7b
SH		 811 dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
812 GFP_KERNEL);
813 if (!dev)
814 return;
815
4139032b
HR		 816 dev->start_port = rdma_start_port(device);
817 dev->end_port = rdma_end_port(device);
faec2f7b
SH		 818
819 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
a31ad3b0 820 if (!rdma_cap_ib_mcast(device, dev->start_port + i))
fac70d51 821 continue;
faec2f7b
SH		 822 port = &dev->port[i];
823 port->dev = dev;
824 port->port_num = dev->start_port + i;
825 spin_lock_init(&port->lock);
826 port->table = RB_ROOT;
827 init_completion(&port->comp);
828 atomic_set(&port->refcount, 1);
fac70d51
EC		 829 ++count;
830 }
831
832 if (!count) {
833 kfree(dev);
834 return;
faec2f7b
SH		 835 }
836
837 dev->device = device;
838 ib_set_client_data(device, &mcast_client, dev);
839
840 INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler);
841 ib_register_event_handler(&dev->event_handler);
842}
843
7c1eb45a 844static void mcast_remove_one(struct ib_device *device, void *client_data)
faec2f7b 845{
7c1eb45a 846 struct mcast_device *dev = client_data;
faec2f7b
SH		 847 struct mcast_port *port;
848 int i;
849
faec2f7b
SH		 850 if (!dev)
851 return;
852
853 ib_unregister_event_handler(&dev->event_handler);
854 flush_workqueue(mcast_wq);
855
856 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
a31ad3b0 857 if (rdma_cap_ib_mcast(device, dev->start_port + i)) {
fac70d51
EC		 858 port = &dev->port[i];
859 deref_port(port);
860 wait_for_completion(&port->comp);
861 }
faec2f7b
SH		 862 }
863
864 kfree(dev);
865}
866
867int mcast_init(void)
868{
869 int ret;
870
871 mcast_wq = create_singlethread_workqueue("ib_mcast");
872 if (!mcast_wq)
873 return -ENOMEM;
874
875 ib_sa_register_client(&sa_client);
876
877 ret = ib_register_client(&mcast_client);
878 if (ret)
879 goto err;
880 return 0;
881
882err:
883 ib_sa_unregister_client(&sa_client);
884 destroy_workqueue(mcast_wq);
885 return ret;
886}
887
888void mcast_cleanup(void)
889{
890 ib_unregister_client(&mcast_client);
891 ib_sa_unregister_client(&sa_client);
892 destroy_workqueue(mcast_wq);
893}
Linux 6.x block layer and io_uring tree(s)