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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / infiniband / core / multicast.c
blobcd338ddc4a39a6d2f5637794eaccfc6b7c2ac917
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
522 if (ib_find_pkey(group->port->dev->device,
523 group->port->port_num, be16_to_cpu(rec->pkey),
524 &pkey_index))
525 pkey_index = MCAST_INVALID_PKEY_INDEX;
526
527 spin_lock_irq(&group->port->lock);
528 if (group->state == MCAST_BUSY &&
529 group->pkey_index == MCAST_INVALID_PKEY_INDEX)
530 group->pkey_index = pkey_index;
531 mgids_changed = memcmp(&rec->mgid, &group->rec.mgid,
532 sizeof(group->rec.mgid));
533 group->rec = *rec;
534 if (mgids_changed) {
535 rb_erase(&group->node, &group->port->table);
536 is_mgid0 = !memcmp(&mgid0, &group->rec.mgid,
537 sizeof(mgid0));
538 mcast_insert(group->port, group, is_mgid0);
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 /**
720 * ib_init_ah_from_mcmember - Initialize AH attribute from multicast
721 * member record and gid of the device.
722 * @device: RDMA device
723 * @port_num: Port of the rdma device to consider
724 * @ndev: Optional netdevice, applicable only for RoCE
725 * @gid_type: GID type to consider
726 * @ah_attr: AH attribute to fillup on successful completion
727 *
728 * ib_init_ah_from_mcmember() initializes AH attribute based on multicast
729 * member record and other device properties. On success the caller is
730 * responsible to call rdma_destroy_ah_attr on the ah_attr. Returns 0 on
731 * success or appropriate error code.
732 *
733 */
734 int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num,
735 struct ib_sa_mcmember_rec *rec,
736 struct net_device *ndev,
737 enum ib_gid_type gid_type,
738 struct rdma_ah_attr *ah_attr)
739 {
740 const struct ib_gid_attr *sgid_attr;
741
742 /* GID table is not based on the netdevice for IB link layer,
743 * so ignore ndev during search.
744 */
745 if (rdma_protocol_ib(device, port_num))
746 ndev = NULL;
747 else if (!rdma_protocol_roce(device, port_num))
748 return -EINVAL;
749
750 sgid_attr = rdma_find_gid_by_port(device, &rec->port_gid,
751 gid_type, port_num, ndev);
752 if (IS_ERR(sgid_attr))
753 return PTR_ERR(sgid_attr);
754
755 memset(ah_attr, 0, sizeof(*ah_attr));
756 ah_attr->type = rdma_ah_find_type(device, port_num);
757
758 rdma_ah_set_dlid(ah_attr, be16_to_cpu(rec->mlid));
759 rdma_ah_set_sl(ah_attr, rec->sl);
760 rdma_ah_set_port_num(ah_attr, port_num);
761 rdma_ah_set_static_rate(ah_attr, rec->rate);
762 rdma_move_grh_sgid_attr(ah_attr, &rec->mgid,
763 be32_to_cpu(rec->flow_label),
764 rec->hop_limit, rec->traffic_class,
765 sgid_attr);
766 return 0;
767 }
768 EXPORT_SYMBOL(ib_init_ah_from_mcmember);
769
770 static void mcast_groups_event(struct mcast_port *port,
771 enum mcast_group_state state)
772 {
773 struct mcast_group *group;
774 struct rb_node *node;
775 unsigned long flags;
776
777 spin_lock_irqsave(&port->lock, flags);
778 for (node = rb_first(&port->table); node; node = rb_next(node)) {
779 group = rb_entry(node, struct mcast_group, node);
780 spin_lock(&group->lock);
781 if (group->state == MCAST_IDLE) {
782 atomic_inc(&group->refcount);
783 queue_work(mcast_wq, &group->work);
784 }
785 if (group->state != MCAST_GROUP_ERROR)
786 group->state = state;
787 spin_unlock(&group->lock);
788 }
789 spin_unlock_irqrestore(&port->lock, flags);
790 }
791
792 static void mcast_event_handler(struct ib_event_handler *handler,
793 struct ib_event *event)
794 {
795 struct mcast_device *dev;
796 int index;
797
798 dev = container_of(handler, struct mcast_device, event_handler);
799 if (!rdma_cap_ib_mcast(dev->device, event->element.port_num))
800 return;
801
802 index = event->element.port_num - dev->start_port;
803
804 switch (event->event) {
805 case IB_EVENT_PORT_ERR:
806 case IB_EVENT_LID_CHANGE:
807 case IB_EVENT_CLIENT_REREGISTER:
808 mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR);
809 break;
810 case IB_EVENT_PKEY_CHANGE:
811 mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT);
812 break;
813 default:
814 break;
815 }
816 }
817
818 static void mcast_add_one(struct ib_device *device)
819 {
820 struct mcast_device *dev;
821 struct mcast_port *port;
822 int i;
823 int count = 0;
824
825 dev = kmalloc(struct_size(dev, port, device->phys_port_cnt),
826 GFP_KERNEL);
827 if (!dev)
828 return;
829
830 dev->start_port = rdma_start_port(device);
831 dev->end_port = rdma_end_port(device);
832
833 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
834 if (!rdma_cap_ib_mcast(device, dev->start_port + i))
835 continue;
836 port = &dev->port[i];
837 port->dev = dev;
838 port->port_num = dev->start_port + i;
839 spin_lock_init(&port->lock);
840 port->table = RB_ROOT;
841 init_completion(&port->comp);
842 atomic_set(&port->refcount, 1);
843 ++count;
844 }
845
846 if (!count) {
847 kfree(dev);
848 return;
849 }
850
851 dev->device = device;
852 ib_set_client_data(device, &mcast_client, dev);
853
854 INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler);
855 ib_register_event_handler(&dev->event_handler);
856 }
857
858 static void mcast_remove_one(struct ib_device *device, void *client_data)
859 {
860 struct mcast_device *dev = client_data;
861 struct mcast_port *port;
862 int i;
863
864 if (!dev)
865 return;
866
867 ib_unregister_event_handler(&dev->event_handler);
868 flush_workqueue(mcast_wq);
869
870 for (i = 0; i <= dev->end_port - dev->start_port; i++) {
871 if (rdma_cap_ib_mcast(device, dev->start_port + i)) {
872 port = &dev->port[i];
873 deref_port(port);
874 wait_for_completion(&port->comp);
875 }
876 }
877
878 kfree(dev);
879 }
880
881 int mcast_init(void)
882 {
883 int ret;
884
885 mcast_wq = alloc_ordered_workqueue("ib_mcast", WQ_MEM_RECLAIM);
886 if (!mcast_wq)
887 return -ENOMEM;
888
889 ib_sa_register_client(&sa_client);
890
891 ret = ib_register_client(&mcast_client);
892 if (ret)
893 goto err;
894 return 0;
895
896 err:
897 ib_sa_unregister_client(&sa_client);
898 destroy_workqueue(mcast_wq);
899 return ret;
900 }
901
902 void mcast_cleanup(void)
903 {
904 ib_unregister_client(&mcast_client);
905 ib_sa_unregister_client(&sa_client);
906 destroy_workqueue(mcast_wq);
907 }
Linux with added FPC-III support