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blkcg: fix blkg_alloc() failure path
[linux-2.6.git] / drivers / infiniband / core / multicast.c
blobd2360a8ef0b29ea6d6c9a3bebc05cf07b087a02f
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
45 static void mcast_add_one(struct ib_device *device);
46 static void mcast_remove_one(struct ib_device *device);
47
48 static struct ib_client mcast_client = {
49 .name = "ib_multicast",
50 .add = mcast_add_one,
51 .remove = mcast_remove_one
52 };
53
54 static struct ib_sa_client sa_client;
55 static struct workqueue_struct *mcast_wq;
56 static union ib_gid mgid0;
57
58 struct mcast_device;
59
60 struct 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
69 struct 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
77 enum mcast_state {
78 MCAST_JOINING,
79 MCAST_MEMBER,
80 MCAST_ERROR,
81 };
82
83 enum mcast_group_state {
84 MCAST_IDLE,
85 MCAST_BUSY,
86 MCAST_GROUP_ERROR,
87 MCAST_PKEY_EVENT
88 };
89
90 enum {
91 MCAST_INVALID_PKEY_INDEX = 0xFFFF
92 };
93
94 struct mcast_member;
95
96 struct 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
115 struct 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
125 static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
126 void *context);
127 static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
128 void *context);
129
130 static 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
151 static 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
180 static void deref_port(struct mcast_port *port)
181 {
182 if (atomic_dec_and_test(&port->refcount))
183 complete(&port->comp);
184 }
185
186 static 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
201 static void deref_member(struct mcast_member *member)
202 {
203 if (atomic_dec_and_test(&member->refcount))
204 complete(&member->comp);
205 }
206
207 static 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 */
228 static 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 */
243 static 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
255 static 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
283 static 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
330 static 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
349 static 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
373 static 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
384 static 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
393 static 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;
427 out:
428 group->state = MCAST_BUSY;
429 spin_unlock_irq(&group->lock);
430 }
431
432 static 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);
441 retest:
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 */
499 static 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
519 static 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
545 static 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
557 static 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);
593 found:
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 */
606 struct ib_sa_multicast *
607 ib_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
655 err:
656 ib_sa_client_put(client);
657 kfree(member);
658 return ERR_PTR(ret);
659 }
660 EXPORT_SYMBOL(ib_sa_join_multicast);
661
662 void 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 }
691 EXPORT_SYMBOL(ib_sa_free_multicast);
692
693 int 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 }
717 EXPORT_SYMBOL(ib_sa_get_mcmember_rec);
718
719 int 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 }
747 EXPORT_SYMBOL(ib_init_ah_from_mcmember);
748
749 static 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
771 static 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
799 static 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
847 static 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
872 int 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
887 err:
888 ib_sa_unregister_client(&sa_client);
889 destroy_workqueue(mcast_wq);
890 return ret;
891 }
892
893 void mcast_cleanup(void)
894 {
895 ib_unregister_client(&mcast_client);
896 ib_sa_unregister_client(&sa_client);
897 destroy_workqueue(mcast_wq);
898 }
Linus' kernel tree