?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge remote-tracking branches 'asoc/topic/sgtl5000', 'asoc/topic/simple', 'asoc...
[linux/fpc-iii.git] / drivers / infiniband / core / multicast.c
blob51c79b2fb0b837f4fbfe5a9672e98dd1dd304f61
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, void *client_data);
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[NUM_JOIN_MEMBERSHIP_TYPES];
106 atomic_t refcount;
107 enum mcast_group_state state;
108 struct ib_sa_query *query;
109 u16 pkey_index;
110 u8 leave_state;
111 int retries;
112 };
113
114 struct 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
124 static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
125 void *context);
126 static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
127 void *context);
128
129 static 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
150 static 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
179 static void deref_port(struct mcast_port *port)
180 {
181 if (atomic_dec_and_test(&port->refcount))
182 complete(&port->comp);
183 }
184
185 static 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
200 static void deref_member(struct mcast_member *member)
201 {
202 if (atomic_dec_and_test(&member->refcount))
203 complete(&member->comp);
204 }
205
206 static 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 four types of members: full member, non member,
223 * sendonly non member and sendonly full member.
224 * 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 < NUM_JOIN_MEMBERSHIP_TYPES; 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 < NUM_JOIN_MEMBERSHIP_TYPES; 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 return (ret > 0) ? 0 : ret;
343 }
344
345 static int send_leave(struct mcast_group *group, u8 leave_state)
346 {
347 struct mcast_port *port = group->port;
348 struct ib_sa_mcmember_rec rec;
349 int ret;
350
351 rec = group->rec;
352 rec.join_state = leave_state;
353 group->leave_state = leave_state;
354
355 ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
356 port->port_num, IB_SA_METHOD_DELETE, &rec,
357 IB_SA_MCMEMBER_REC_MGID |
358 IB_SA_MCMEMBER_REC_PORT_GID |
359 IB_SA_MCMEMBER_REC_JOIN_STATE,
360 3000, GFP_KERNEL, leave_handler,
361 group, &group->query);
362 return (ret > 0) ? 0 : ret;
363 }
364
365 static void join_group(struct mcast_group *group, struct mcast_member *member,
366 u8 join_state)
367 {
368 member->state = MCAST_MEMBER;
369 adjust_membership(group, join_state, 1);
370 group->rec.join_state |= join_state;
371 member->multicast.rec = group->rec;
372 member->multicast.rec.join_state = join_state;
373 list_move(&member->list, &group->active_list);
374 }
375
376 static int fail_join(struct mcast_group *group, struct mcast_member *member,
377 int status)
378 {
379 spin_lock_irq(&group->lock);
380 list_del_init(&member->list);
381 spin_unlock_irq(&group->lock);
382 return member->multicast.callback(status, &member->multicast);
383 }
384
385 static void process_group_error(struct mcast_group *group)
386 {
387 struct mcast_member *member;
388 int ret = 0;
389 u16 pkey_index;
390
391 if (group->state == MCAST_PKEY_EVENT)
392 ret = ib_find_pkey(group->port->dev->device,
393 group->port->port_num,
394 be16_to_cpu(group->rec.pkey), &pkey_index);
395
396 spin_lock_irq(&group->lock);
397 if (group->state == MCAST_PKEY_EVENT && !ret &&
398 group->pkey_index == pkey_index)
399 goto out;
400
401 while (!list_empty(&group->active_list)) {
402 member = list_entry(group->active_list.next,
403 struct mcast_member, list);
404 atomic_inc(&member->refcount);
405 list_del_init(&member->list);
406 adjust_membership(group, member->multicast.rec.join_state, -1);
407 member->state = MCAST_ERROR;
408 spin_unlock_irq(&group->lock);
409
410 ret = member->multicast.callback(-ENETRESET,
411 &member->multicast);
412 deref_member(member);
413 if (ret)
414 ib_sa_free_multicast(&member->multicast);
415 spin_lock_irq(&group->lock);
416 }
417
418 group->rec.join_state = 0;
419 out:
420 group->state = MCAST_BUSY;
421 spin_unlock_irq(&group->lock);
422 }
423
424 static void mcast_work_handler(struct work_struct *work)
425 {
426 struct mcast_group *group;
427 struct mcast_member *member;
428 struct ib_sa_multicast *multicast;
429 int status, ret;
430 u8 join_state;
431
432 group = container_of(work, typeof(*group), work);
433 retest:
434 spin_lock_irq(&group->lock);
435 while (!list_empty(&group->pending_list) ||
436 (group->state != MCAST_BUSY)) {
437
438 if (group->state != MCAST_BUSY) {
439 spin_unlock_irq(&group->lock);
440 process_group_error(group);
441 goto retest;
442 }
443
444 member = list_entry(group->pending_list.next,
445 struct mcast_member, list);
446 multicast = &member->multicast;
447 join_state = multicast->rec.join_state;
448 atomic_inc(&member->refcount);
449
450 if (join_state == (group->rec.join_state & join_state)) {
451 status = cmp_rec(&group->rec, &multicast->rec,
452 multicast->comp_mask);
453 if (!status)
454 join_group(group, member, join_state);
455 else
456 list_del_init(&member->list);
457 spin_unlock_irq(&group->lock);
458 ret = multicast->callback(status, multicast);
459 } else {
460 spin_unlock_irq(&group->lock);
461 status = send_join(group, member);
462 if (!status) {
463 deref_member(member);
464 return;
465 }
466 ret = fail_join(group, member, status);
467 }
468
469 deref_member(member);
470 if (ret)
471 ib_sa_free_multicast(&member->multicast);
472 spin_lock_irq(&group->lock);
473 }
474
475 join_state = get_leave_state(group);
476 if (join_state) {
477 group->rec.join_state &= ~join_state;
478 spin_unlock_irq(&group->lock);
479 if (send_leave(group, join_state))
480 goto retest;
481 } else {
482 group->state = MCAST_IDLE;
483 spin_unlock_irq(&group->lock);
484 release_group(group);
485 }
486 }
487
488 /*
489 * Fail a join request if it is still active - at the head of the pending queue.
490 */
491 static void process_join_error(struct mcast_group *group, int status)
492 {
493 struct mcast_member *member;
494 int ret;
495
496 spin_lock_irq(&group->lock);
497 member = list_entry(group->pending_list.next,
498 struct mcast_member, list);
499 if (group->last_join == member) {
500 atomic_inc(&member->refcount);
501 list_del_init(&member->list);
502 spin_unlock_irq(&group->lock);
503 ret = member->multicast.callback(status, &member->multicast);
504 deref_member(member);
505 if (ret)
506 ib_sa_free_multicast(&member->multicast);
507 } else
508 spin_unlock_irq(&group->lock);
509 }
510
511 static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
512 void *context)
513 {
514 struct mcast_group *group = context;
515 u16 pkey_index = MCAST_INVALID_PKEY_INDEX;
516
517 if (status)
518 process_join_error(group, status);
519 else {
520 int mgids_changed, is_mgid0;
521 ib_find_pkey(group->port->dev->device, group->port->port_num,
522 be16_to_cpu(rec->pkey), &pkey_index);
523
524 spin_lock_irq(&group->port->lock);
525 if (group->state == MCAST_BUSY &&
526 group->pkey_index == MCAST_INVALID_PKEY_INDEX)
527 group->pkey_index = pkey_index;
528 mgids_changed = memcmp(&rec->mgid, &group->rec.mgid,
529 sizeof(group->rec.mgid));
530 group->rec = *rec;
531 if (mgids_changed) {
532 rb_erase(&group->node, &group->port->table);
533 is_mgid0 = !memcmp(&mgid0, &group->rec.mgid,
534 sizeof(mgid0));
535 mcast_insert(group->port, group, is_mgid0);
536 }
537 spin_unlock_irq(&group->port->lock);
538 }
539 mcast_work_handler(&group->work);
540 }
541
542 static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
543 void *context)
544 {
545 struct mcast_group *group = context;
546
547 if (status && group->retries > 0 &&
548 !send_leave(group, group->leave_state))
549 group->retries--;
550 else
551 mcast_work_handler(&group->work);
552 }
553
554 static struct mcast_group *acquire_group(struct mcast_port *port,
555 union ib_gid *mgid, gfp_t gfp_mask)
556 {
557 struct mcast_group *group, *cur_group;
558 unsigned long flags;
559 int is_mgid0;
560
561 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
562 if (!is_mgid0) {
563 spin_lock_irqsave(&port->lock, flags);
564 group = mcast_find(port, mgid);
565 if (group)
566 goto found;
567 spin_unlock_irqrestore(&port->lock, flags);
568 }
569
570 group = kzalloc(sizeof *group, gfp_mask);
571 if (!group)
572 return NULL;
573
574 group->retries = 3;
575 group->port = port;
576 group->rec.mgid = *mgid;
577 group->pkey_index = MCAST_INVALID_PKEY_INDEX;
578 INIT_LIST_HEAD(&group->pending_list);
579 INIT_LIST_HEAD(&group->active_list);
580 INIT_WORK(&group->work, mcast_work_handler);
581 spin_lock_init(&group->lock);
582
583 spin_lock_irqsave(&port->lock, flags);
584 cur_group = mcast_insert(port, group, is_mgid0);
585 if (cur_group) {
586 kfree(group);
587 group = cur_group;
588 } else
589 atomic_inc(&port->refcount);
590 found:
591 atomic_inc(&group->refcount);
592 spin_unlock_irqrestore(&port->lock, flags);
593 return group;
594 }
595
596 /*
597 * We serialize all join requests to a single group to make our lives much
598 * easier. Otherwise, two users could try to join the same group
599 * simultaneously, with different configurations, one could leave while the
600 * join is in progress, etc., which makes locking around error recovery
601 * difficult.
602 */
603 struct ib_sa_multicast *
604 ib_sa_join_multicast(struct ib_sa_client *client,
605 struct ib_device *device, u8 port_num,
606 struct ib_sa_mcmember_rec *rec,
607 ib_sa_comp_mask comp_mask, gfp_t gfp_mask,
608 int (*callback)(int status,
609 struct ib_sa_multicast *multicast),
610 void *context)
611 {
612 struct mcast_device *dev;
613 struct mcast_member *member;
614 struct ib_sa_multicast *multicast;
615 int ret;
616
617 dev = ib_get_client_data(device, &mcast_client);
618 if (!dev)
619 return ERR_PTR(-ENODEV);
620
621 member = kmalloc(sizeof *member, gfp_mask);
622 if (!member)
623 return ERR_PTR(-ENOMEM);
624
625 ib_sa_client_get(client);
626 member->client = client;
627 member->multicast.rec = *rec;
628 member->multicast.comp_mask = comp_mask;
629 member->multicast.callback = callback;
630 member->multicast.context = context;
631 init_completion(&member->comp);
632 atomic_set(&member->refcount, 1);
633 member->state = MCAST_JOINING;
634
635 member->group = acquire_group(&dev->port[port_num - dev->start_port],
636 &rec->mgid, gfp_mask);
637 if (!member->group) {
638 ret = -ENOMEM;
639 goto err;
640 }
641
642 /*
643 * The user will get the multicast structure in their callback. They
644 * could then free the multicast structure before we can return from
645 * this routine. So we save the pointer to return before queuing
646 * any callback.
647 */
648 multicast = &member->multicast;
649 queue_join(member);
650 return multicast;
651
652 err:
653 ib_sa_client_put(client);
654 kfree(member);
655 return ERR_PTR(ret);
656 }
657 EXPORT_SYMBOL(ib_sa_join_multicast);
658
659 void ib_sa_free_multicast(struct ib_sa_multicast *multicast)
660 {
661 struct mcast_member *member;
662 struct mcast_group *group;
663
664 member = container_of(multicast, struct mcast_member, multicast);
665 group = member->group;
666
667 spin_lock_irq(&group->lock);
668 if (member->state == MCAST_MEMBER)
669 adjust_membership(group, multicast->rec.join_state, -1);
670
671 list_del_init(&member->list);
672
673 if (group->state == MCAST_IDLE) {
674 group->state = MCAST_BUSY;
675 spin_unlock_irq(&group->lock);
676 /* Continue to hold reference on group until callback */
677 queue_work(mcast_wq, &group->work);
678 } else {
679 spin_unlock_irq(&group->lock);
680 release_group(group);
681 }
682
683 deref_member(member);
684 wait_for_completion(&member->comp);
685 ib_sa_client_put(member->client);
686 kfree(member);
687 }
688 EXPORT_SYMBOL(ib_sa_free_multicast);
689
690 int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num,
691 union ib_gid *mgid, struct ib_sa_mcmember_rec *rec)
692 {
693 struct mcast_device *dev;
694 struct mcast_port *port;
695 struct mcast_group *group;
696 unsigned long flags;
697 int ret = 0;
698
699 dev = ib_get_client_data(device, &mcast_client);
700 if (!dev)
701 return -ENODEV;
702
703 port = &dev->port[port_num - dev->start_port];
704 spin_lock_irqsave(&port->lock, flags);
705 group = mcast_find(port, mgid);
706 if (group)
707 *rec = group->rec;
708 else
709 ret = -EADDRNOTAVAIL;
710 spin_unlock_irqrestore(&port->lock, flags);
711
712 return ret;
713 }
714 EXPORT_SYMBOL(ib_sa_get_mcmember_rec);
715
716 int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num,
717 struct ib_sa_mcmember_rec *rec,
718 struct net_device *ndev,
719 enum ib_gid_type gid_type,
720 struct ib_ah_attr *ah_attr)
721 {
722 int ret;
723 u16 gid_index;
724 u8 p;
725
726 if (rdma_protocol_roce(device, port_num)) {
727 ret = ib_find_cached_gid_by_port(device, &rec->port_gid,
728 gid_type, port_num,
729 ndev,
730 &gid_index);
731 } else if (rdma_protocol_ib(device, port_num)) {
732 ret = ib_find_cached_gid(device, &rec->port_gid,
733 IB_GID_TYPE_IB, NULL, &p,
734 &gid_index);
735 } else {
736 ret = -EINVAL;
737 }
738
739 if (ret)
740 return ret;
741
742 memset(ah_attr, 0, sizeof *ah_attr);
743 ah_attr->dlid = be16_to_cpu(rec->mlid);
744 ah_attr->sl = rec->sl;
745 ah_attr->port_num = port_num;
746 ah_attr->static_rate = rec->rate;
747
748 ah_attr->ah_flags = IB_AH_GRH;
749 ah_attr->grh.dgid = rec->mgid;
750
751 ah_attr->grh.sgid_index = (u8) gid_index;
752 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
753 ah_attr->grh.hop_limit = rec->hop_limit;
754 ah_attr->grh.traffic_class = rec->traffic_class;
755
756 return 0;
757 }
758 EXPORT_SYMBOL(ib_init_ah_from_mcmember);
759
760 static void mcast_groups_event(struct mcast_port *port,
761 enum mcast_group_state state)
762 {
763 struct mcast_group *group;
764 struct rb_node *node;
765 unsigned long flags;
766
767 spin_lock_irqsave(&port->lock, flags);
768 for (node = rb_first(&port->table); node; node = rb_next(node)) {
769 group = rb_entry(node, struct mcast_group, node);
770 spin_lock(&group->lock);
771 if (group->state == MCAST_IDLE) {
772 atomic_inc(&group->refcount);
773 queue_work(mcast_wq, &group->work);
774 }
775 if (group->state != MCAST_GROUP_ERROR)
776 group->state = state;
777 spin_unlock(&group->lock);
778 }
779 spin_unlock_irqrestore(&port->lock, flags);
780 }
781
782 static void mcast_event_handler(struct ib_event_handler *handler,
783 struct ib_event *event)
784 {
785 struct mcast_device *dev;
786 int index;
787
788 dev = container_of(handler, struct mcast_device, event_handler);
789 if (!rdma_cap_ib_mcast(dev->device, event->element.port_num))
790 return;
791
792 index = event->element.port_num - dev->start_port;
793
794 switch (event->event) {
795 case IB_EVENT_PORT_ERR:
796 case IB_EVENT_LID_CHANGE:
797 case IB_EVENT_SM_CHANGE:
798 case IB_EVENT_CLIENT_REREGISTER:
799 mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR);
800 break;
801 case IB_EVENT_PKEY_CHANGE:
802 mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT);
803 break;
804 default:
805 break;
806 }
807 }
808
809 static void mcast_add_one(struct ib_device *device)
810 {
811 struct mcast_device *dev;
812 struct mcast_port *port;
813 int i;
814 int count = 0;
815
816 dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
817 GFP_KERNEL);
818 if (!dev)
819 return;
820
821 dev->start_port = rdma_start_port(device);
822 dev->end_port = rdma_end_port(device);
823
824 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
825 if (!rdma_cap_ib_mcast(device, dev->start_port + i))
826 continue;
827 port = &dev->port[i];
828 port->dev = dev;
829 port->port_num = dev->start_port + i;
830 spin_lock_init(&port->lock);
831 port->table = RB_ROOT;
832 init_completion(&port->comp);
833 atomic_set(&port->refcount, 1);
834 ++count;
835 }
836
837 if (!count) {
838 kfree(dev);
839 return;
840 }
841
842 dev->device = device;
843 ib_set_client_data(device, &mcast_client, dev);
844
845 INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler);
846 ib_register_event_handler(&dev->event_handler);
847 }
848
849 static void mcast_remove_one(struct ib_device *device, void *client_data)
850 {
851 struct mcast_device *dev = client_data;
852 struct mcast_port *port;
853 int i;
854
855 if (!dev)
856 return;
857
858 ib_unregister_event_handler(&dev->event_handler);
859 flush_workqueue(mcast_wq);
860
861 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
862 if (rdma_cap_ib_mcast(device, dev->start_port + i)) {
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 }
Linux with added FPC-III support