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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> | |
5a0e3ad6 | 37 | #include <linux/slab.h> |
faec2f7b SH |
38 | #include <linux/bitops.h> |
39 | #include <linux/random.h> | |
40 | ||
41 | #include <rdma/ib_cache.h> | |
42 | #include "sa.h" | |
43 | ||
44 | static void mcast_add_one(struct ib_device *device); | |
45 | static void mcast_remove_one(struct ib_device *device); | |
46 | ||
47 | static struct ib_client mcast_client = { | |
48 | .name = "ib_multicast", | |
49 | .add = mcast_add_one, | |
50 | .remove = mcast_remove_one | |
51 | }; | |
52 | ||
53 | static struct ib_sa_client sa_client; | |
54 | static struct workqueue_struct *mcast_wq; | |
55 | static union ib_gid mgid0; | |
56 | ||
57 | struct mcast_device; | |
58 | ||
59 | struct mcast_port { | |
60 | struct mcast_device *dev; | |
61 | spinlock_t lock; | |
62 | struct rb_root table; | |
63 | atomic_t refcount; | |
64 | struct completion comp; | |
65 | u8 port_num; | |
66 | }; | |
67 | ||
68 | struct mcast_device { | |
69 | struct ib_device *device; | |
70 | struct ib_event_handler event_handler; | |
71 | int start_port; | |
72 | int end_port; | |
73 | struct mcast_port port[0]; | |
74 | }; | |
75 | ||
76 | enum mcast_state { | |
faec2f7b SH |
77 | MCAST_JOINING, |
78 | MCAST_MEMBER, | |
547af765 SH |
79 | MCAST_ERROR, |
80 | }; | |
81 | ||
82 | enum mcast_group_state { | |
83 | MCAST_IDLE, | |
faec2f7b | 84 | MCAST_BUSY, |
547af765 SH |
85 | MCAST_GROUP_ERROR, |
86 | MCAST_PKEY_EVENT | |
87 | }; | |
88 | ||
89 | enum { | |
90 | MCAST_INVALID_PKEY_INDEX = 0xFFFF | |
faec2f7b SH |
91 | }; |
92 | ||
93 | struct mcast_member; | |
94 | ||
95 | struct mcast_group { | |
96 | struct ib_sa_mcmember_rec rec; | |
97 | struct rb_node node; | |
98 | struct mcast_port *port; | |
99 | spinlock_t lock; | |
100 | struct work_struct work; | |
101 | struct list_head pending_list; | |
102 | struct list_head active_list; | |
103 | struct mcast_member *last_join; | |
104 | int members[3]; | |
105 | atomic_t refcount; | |
547af765 | 106 | enum mcast_group_state state; |
faec2f7b SH |
107 | struct ib_sa_query *query; |
108 | int query_id; | |
547af765 | 109 | u16 pkey_index; |
e1d7806d YE |
110 | u8 leave_state; |
111 | int retries; | |
faec2f7b SH |
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); | |
57cb61d5 | 212 | list_add_tail(&member->list, &group->pending_list); |
faec2f7b SH |
213 | if (group->state == MCAST_IDLE) { |
214 | group->state = MCAST_BUSY; | |
215 | atomic_inc(&group->refcount); | |
216 | queue_work(mcast_wq, &group->work); | |
217 | } | |
218 | spin_unlock_irqrestore(&group->lock, flags); | |
219 | } | |
220 | ||
221 | /* | |
222 | * A multicast group has three types of members: full member, non member, and | |
223 | * send only member. We need to keep track of the number of members of each | |
224 | * type based on their join state. Adjust the number of members the belong to | |
225 | * the specified join states. | |
226 | */ | |
227 | static void adjust_membership(struct mcast_group *group, u8 join_state, int inc) | |
228 | { | |
229 | int i; | |
230 | ||
231 | for (i = 0; i < 3; i++, join_state >>= 1) | |
232 | if (join_state & 0x1) | |
233 | group->members[i] += inc; | |
234 | } | |
235 | ||
236 | /* | |
237 | * If a multicast group has zero members left for a particular join state, but | |
238 | * the group is still a member with the SA, we need to leave that join state. | |
239 | * Determine which join states we still belong to, but that do not have any | |
240 | * active members. | |
241 | */ | |
242 | static u8 get_leave_state(struct mcast_group *group) | |
243 | { | |
244 | u8 leave_state = 0; | |
245 | int i; | |
246 | ||
247 | for (i = 0; i < 3; i++) | |
248 | if (!group->members[i]) | |
249 | leave_state |= (0x1 << i); | |
250 | ||
251 | return leave_state & group->rec.join_state; | |
252 | } | |
253 | ||
254 | static int check_selector(ib_sa_comp_mask comp_mask, | |
255 | ib_sa_comp_mask selector_mask, | |
256 | ib_sa_comp_mask value_mask, | |
257 | u8 selector, u8 src_value, u8 dst_value) | |
258 | { | |
259 | int err; | |
260 | ||
261 | if (!(comp_mask & selector_mask) || !(comp_mask & value_mask)) | |
262 | return 0; | |
263 | ||
264 | switch (selector) { | |
265 | case IB_SA_GT: | |
266 | err = (src_value <= dst_value); | |
267 | break; | |
268 | case IB_SA_LT: | |
269 | err = (src_value >= dst_value); | |
270 | break; | |
271 | case IB_SA_EQ: | |
272 | err = (src_value != dst_value); | |
273 | break; | |
274 | default: | |
275 | err = 0; | |
276 | break; | |
277 | } | |
278 | ||
279 | return err; | |
280 | } | |
281 | ||
282 | static int cmp_rec(struct ib_sa_mcmember_rec *src, | |
283 | struct ib_sa_mcmember_rec *dst, ib_sa_comp_mask comp_mask) | |
284 | { | |
285 | /* MGID must already match */ | |
286 | ||
287 | if (comp_mask & IB_SA_MCMEMBER_REC_PORT_GID && | |
288 | memcmp(&src->port_gid, &dst->port_gid, sizeof src->port_gid)) | |
289 | return -EINVAL; | |
290 | if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey) | |
291 | return -EINVAL; | |
292 | if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid) | |
293 | return -EINVAL; | |
294 | if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR, | |
295 | IB_SA_MCMEMBER_REC_MTU, dst->mtu_selector, | |
296 | src->mtu, dst->mtu)) | |
297 | return -EINVAL; | |
298 | if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS && | |
299 | src->traffic_class != dst->traffic_class) | |
300 | return -EINVAL; | |
301 | if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey) | |
302 | return -EINVAL; | |
303 | if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR, | |
304 | IB_SA_MCMEMBER_REC_RATE, dst->rate_selector, | |
305 | src->rate, dst->rate)) | |
306 | return -EINVAL; | |
307 | if (check_selector(comp_mask, | |
308 | IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR, | |
309 | IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME, | |
310 | dst->packet_life_time_selector, | |
311 | src->packet_life_time, dst->packet_life_time)) | |
312 | return -EINVAL; | |
313 | if (comp_mask & IB_SA_MCMEMBER_REC_SL && src->sl != dst->sl) | |
314 | return -EINVAL; | |
315 | if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL && | |
316 | src->flow_label != dst->flow_label) | |
317 | return -EINVAL; | |
318 | if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT && | |
319 | src->hop_limit != dst->hop_limit) | |
320 | return -EINVAL; | |
321 | if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && src->scope != dst->scope) | |
322 | return -EINVAL; | |
323 | ||
324 | /* join_state checked separately, proxy_join ignored */ | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | static int send_join(struct mcast_group *group, struct mcast_member *member) | |
330 | { | |
331 | struct mcast_port *port = group->port; | |
332 | int ret; | |
333 | ||
334 | group->last_join = member; | |
335 | ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device, | |
336 | port->port_num, IB_MGMT_METHOD_SET, | |
337 | &member->multicast.rec, | |
338 | member->multicast.comp_mask, | |
339 | 3000, GFP_KERNEL, join_handler, group, | |
340 | &group->query); | |
341 | if (ret >= 0) { | |
342 | group->query_id = ret; | |
343 | ret = 0; | |
344 | } | |
345 | return ret; | |
346 | } | |
347 | ||
348 | static int send_leave(struct mcast_group *group, u8 leave_state) | |
349 | { | |
350 | struct mcast_port *port = group->port; | |
351 | struct ib_sa_mcmember_rec rec; | |
352 | int ret; | |
353 | ||
354 | rec = group->rec; | |
355 | rec.join_state = leave_state; | |
e1d7806d | 356 | group->leave_state = leave_state; |
faec2f7b SH |
357 | |
358 | ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device, | |
359 | port->port_num, IB_SA_METHOD_DELETE, &rec, | |
360 | IB_SA_MCMEMBER_REC_MGID | | |
361 | IB_SA_MCMEMBER_REC_PORT_GID | | |
362 | IB_SA_MCMEMBER_REC_JOIN_STATE, | |
363 | 3000, GFP_KERNEL, leave_handler, | |
364 | group, &group->query); | |
365 | if (ret >= 0) { | |
366 | group->query_id = ret; | |
367 | ret = 0; | |
368 | } | |
369 | return ret; | |
370 | } | |
371 | ||
372 | static void join_group(struct mcast_group *group, struct mcast_member *member, | |
373 | u8 join_state) | |
374 | { | |
375 | member->state = MCAST_MEMBER; | |
376 | adjust_membership(group, join_state, 1); | |
377 | group->rec.join_state |= join_state; | |
378 | member->multicast.rec = group->rec; | |
379 | member->multicast.rec.join_state = join_state; | |
380 | list_move(&member->list, &group->active_list); | |
381 | } | |
382 | ||
383 | static int fail_join(struct mcast_group *group, struct mcast_member *member, | |
384 | int status) | |
385 | { | |
386 | spin_lock_irq(&group->lock); | |
387 | list_del_init(&member->list); | |
388 | spin_unlock_irq(&group->lock); | |
389 | return member->multicast.callback(status, &member->multicast); | |
390 | } | |
391 | ||
392 | static void process_group_error(struct mcast_group *group) | |
393 | { | |
394 | struct mcast_member *member; | |
547af765 SH |
395 | int ret = 0; |
396 | u16 pkey_index; | |
397 | ||
398 | if (group->state == MCAST_PKEY_EVENT) | |
399 | ret = ib_find_pkey(group->port->dev->device, | |
400 | group->port->port_num, | |
401 | be16_to_cpu(group->rec.pkey), &pkey_index); | |
faec2f7b SH |
402 | |
403 | spin_lock_irq(&group->lock); | |
547af765 SH |
404 | if (group->state == MCAST_PKEY_EVENT && !ret && |
405 | group->pkey_index == pkey_index) | |
406 | goto out; | |
407 | ||
faec2f7b SH |
408 | while (!list_empty(&group->active_list)) { |
409 | member = list_entry(group->active_list.next, | |
410 | struct mcast_member, list); | |
411 | atomic_inc(&member->refcount); | |
412 | list_del_init(&member->list); | |
413 | adjust_membership(group, member->multicast.rec.join_state, -1); | |
414 | member->state = MCAST_ERROR; | |
415 | spin_unlock_irq(&group->lock); | |
416 | ||
417 | ret = member->multicast.callback(-ENETRESET, | |
418 | &member->multicast); | |
419 | deref_member(member); | |
420 | if (ret) | |
421 | ib_sa_free_multicast(&member->multicast); | |
422 | spin_lock_irq(&group->lock); | |
423 | } | |
424 | ||
425 | group->rec.join_state = 0; | |
547af765 | 426 | out: |
faec2f7b SH |
427 | group->state = MCAST_BUSY; |
428 | spin_unlock_irq(&group->lock); | |
429 | } | |
430 | ||
431 | static void mcast_work_handler(struct work_struct *work) | |
432 | { | |
433 | struct mcast_group *group; | |
434 | struct mcast_member *member; | |
435 | struct ib_sa_multicast *multicast; | |
436 | int status, ret; | |
437 | u8 join_state; | |
438 | ||
439 | group = container_of(work, typeof(*group), work); | |
440 | retest: | |
441 | spin_lock_irq(&group->lock); | |
442 | while (!list_empty(&group->pending_list) || | |
547af765 | 443 | (group->state != MCAST_BUSY)) { |
faec2f7b | 444 | |
547af765 | 445 | if (group->state != MCAST_BUSY) { |
faec2f7b SH |
446 | spin_unlock_irq(&group->lock); |
447 | process_group_error(group); | |
448 | goto retest; | |
449 | } | |
450 | ||
451 | member = list_entry(group->pending_list.next, | |
452 | struct mcast_member, list); | |
453 | multicast = &member->multicast; | |
454 | join_state = multicast->rec.join_state; | |
455 | atomic_inc(&member->refcount); | |
456 | ||
457 | if (join_state == (group->rec.join_state & join_state)) { | |
458 | status = cmp_rec(&group->rec, &multicast->rec, | |
459 | multicast->comp_mask); | |
460 | if (!status) | |
461 | join_group(group, member, join_state); | |
462 | else | |
463 | list_del_init(&member->list); | |
464 | spin_unlock_irq(&group->lock); | |
465 | ret = multicast->callback(status, multicast); | |
466 | } else { | |
467 | spin_unlock_irq(&group->lock); | |
468 | status = send_join(group, member); | |
469 | if (!status) { | |
470 | deref_member(member); | |
471 | return; | |
472 | } | |
473 | ret = fail_join(group, member, status); | |
474 | } | |
475 | ||
476 | deref_member(member); | |
477 | if (ret) | |
478 | ib_sa_free_multicast(&member->multicast); | |
479 | spin_lock_irq(&group->lock); | |
480 | } | |
481 | ||
482 | join_state = get_leave_state(group); | |
483 | if (join_state) { | |
484 | group->rec.join_state &= ~join_state; | |
485 | spin_unlock_irq(&group->lock); | |
486 | if (send_leave(group, join_state)) | |
487 | goto retest; | |
488 | } else { | |
489 | group->state = MCAST_IDLE; | |
490 | spin_unlock_irq(&group->lock); | |
491 | release_group(group); | |
492 | } | |
493 | } | |
494 | ||
495 | /* | |
496 | * Fail a join request if it is still active - at the head of the pending queue. | |
497 | */ | |
498 | static void process_join_error(struct mcast_group *group, int status) | |
499 | { | |
500 | struct mcast_member *member; | |
501 | int ret; | |
502 | ||
503 | spin_lock_irq(&group->lock); | |
504 | member = list_entry(group->pending_list.next, | |
505 | struct mcast_member, list); | |
506 | if (group->last_join == member) { | |
507 | atomic_inc(&member->refcount); | |
508 | list_del_init(&member->list); | |
509 | spin_unlock_irq(&group->lock); | |
510 | ret = member->multicast.callback(status, &member->multicast); | |
511 | deref_member(member); | |
512 | if (ret) | |
513 | ib_sa_free_multicast(&member->multicast); | |
514 | } else | |
515 | spin_unlock_irq(&group->lock); | |
516 | } | |
517 | ||
518 | static void join_handler(int status, struct ib_sa_mcmember_rec *rec, | |
519 | void *context) | |
520 | { | |
521 | struct mcast_group *group = context; | |
547af765 | 522 | u16 pkey_index = MCAST_INVALID_PKEY_INDEX; |
faec2f7b SH |
523 | |
524 | if (status) | |
525 | process_join_error(group, status); | |
526 | else { | |
547af765 SH |
527 | ib_find_pkey(group->port->dev->device, group->port->port_num, |
528 | be16_to_cpu(rec->pkey), &pkey_index); | |
529 | ||
faec2f7b SH |
530 | spin_lock_irq(&group->port->lock); |
531 | group->rec = *rec; | |
547af765 SH |
532 | if (group->state == MCAST_BUSY && |
533 | group->pkey_index == MCAST_INVALID_PKEY_INDEX) | |
534 | group->pkey_index = pkey_index; | |
faec2f7b SH |
535 | if (!memcmp(&mgid0, &group->rec.mgid, sizeof mgid0)) { |
536 | rb_erase(&group->node, &group->port->table); | |
537 | mcast_insert(group->port, group, 1); | |
538 | } | |
539 | spin_unlock_irq(&group->port->lock); | |
540 | } | |
541 | mcast_work_handler(&group->work); | |
542 | } | |
543 | ||
544 | static void leave_handler(int status, struct ib_sa_mcmember_rec *rec, | |
545 | void *context) | |
546 | { | |
547 | struct mcast_group *group = context; | |
548 | ||
e1d7806d YE |
549 | if (status && group->retries > 0 && |
550 | !send_leave(group, group->leave_state)) | |
551 | group->retries--; | |
552 | else | |
553 | mcast_work_handler(&group->work); | |
faec2f7b SH |
554 | } |
555 | ||
556 | static struct mcast_group *acquire_group(struct mcast_port *port, | |
557 | union ib_gid *mgid, gfp_t gfp_mask) | |
558 | { | |
559 | struct mcast_group *group, *cur_group; | |
560 | unsigned long flags; | |
561 | int is_mgid0; | |
562 | ||
563 | is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0); | |
564 | if (!is_mgid0) { | |
565 | spin_lock_irqsave(&port->lock, flags); | |
566 | group = mcast_find(port, mgid); | |
567 | if (group) | |
568 | goto found; | |
569 | spin_unlock_irqrestore(&port->lock, flags); | |
570 | } | |
571 | ||
572 | group = kzalloc(sizeof *group, gfp_mask); | |
573 | if (!group) | |
574 | return NULL; | |
575 | ||
e1d7806d | 576 | group->retries = 3; |
faec2f7b SH |
577 | group->port = port; |
578 | group->rec.mgid = *mgid; | |
547af765 | 579 | group->pkey_index = MCAST_INVALID_PKEY_INDEX; |
faec2f7b SH |
580 | INIT_LIST_HEAD(&group->pending_list); |
581 | INIT_LIST_HEAD(&group->active_list); | |
582 | INIT_WORK(&group->work, mcast_work_handler); | |
583 | spin_lock_init(&group->lock); | |
584 | ||
585 | spin_lock_irqsave(&port->lock, flags); | |
586 | cur_group = mcast_insert(port, group, is_mgid0); | |
587 | if (cur_group) { | |
588 | kfree(group); | |
589 | group = cur_group; | |
590 | } else | |
591 | atomic_inc(&port->refcount); | |
592 | found: | |
593 | atomic_inc(&group->refcount); | |
594 | spin_unlock_irqrestore(&port->lock, flags); | |
595 | return group; | |
596 | } | |
597 | ||
598 | /* | |
599 | * We serialize all join requests to a single group to make our lives much | |
600 | * easier. Otherwise, two users could try to join the same group | |
601 | * simultaneously, with different configurations, one could leave while the | |
602 | * join is in progress, etc., which makes locking around error recovery | |
603 | * difficult. | |
604 | */ | |
605 | struct ib_sa_multicast * | |
606 | ib_sa_join_multicast(struct ib_sa_client *client, | |
607 | struct ib_device *device, u8 port_num, | |
608 | struct ib_sa_mcmember_rec *rec, | |
609 | ib_sa_comp_mask comp_mask, gfp_t gfp_mask, | |
610 | int (*callback)(int status, | |
611 | struct ib_sa_multicast *multicast), | |
612 | void *context) | |
613 | { | |
614 | struct mcast_device *dev; | |
615 | struct mcast_member *member; | |
616 | struct ib_sa_multicast *multicast; | |
617 | int ret; | |
618 | ||
619 | dev = ib_get_client_data(device, &mcast_client); | |
620 | if (!dev) | |
621 | return ERR_PTR(-ENODEV); | |
622 | ||
623 | member = kmalloc(sizeof *member, gfp_mask); | |
624 | if (!member) | |
625 | return ERR_PTR(-ENOMEM); | |
626 | ||
627 | ib_sa_client_get(client); | |
628 | member->client = client; | |
629 | member->multicast.rec = *rec; | |
630 | member->multicast.comp_mask = comp_mask; | |
631 | member->multicast.callback = callback; | |
632 | member->multicast.context = context; | |
633 | init_completion(&member->comp); | |
634 | atomic_set(&member->refcount, 1); | |
635 | member->state = MCAST_JOINING; | |
636 | ||
637 | member->group = acquire_group(&dev->port[port_num - dev->start_port], | |
638 | &rec->mgid, gfp_mask); | |
639 | if (!member->group) { | |
640 | ret = -ENOMEM; | |
641 | goto err; | |
642 | } | |
643 | ||
644 | /* | |
645 | * The user will get the multicast structure in their callback. They | |
646 | * could then free the multicast structure before we can return from | |
647 | * this routine. So we save the pointer to return before queuing | |
648 | * any callback. | |
649 | */ | |
650 | multicast = &member->multicast; | |
651 | queue_join(member); | |
652 | return multicast; | |
653 | ||
654 | err: | |
655 | ib_sa_client_put(client); | |
656 | kfree(member); | |
657 | return ERR_PTR(ret); | |
658 | } | |
659 | EXPORT_SYMBOL(ib_sa_join_multicast); | |
660 | ||
661 | void ib_sa_free_multicast(struct ib_sa_multicast *multicast) | |
662 | { | |
663 | struct mcast_member *member; | |
664 | struct mcast_group *group; | |
665 | ||
666 | member = container_of(multicast, struct mcast_member, multicast); | |
667 | group = member->group; | |
668 | ||
669 | spin_lock_irq(&group->lock); | |
670 | if (member->state == MCAST_MEMBER) | |
671 | adjust_membership(group, multicast->rec.join_state, -1); | |
672 | ||
673 | list_del_init(&member->list); | |
674 | ||
675 | if (group->state == MCAST_IDLE) { | |
676 | group->state = MCAST_BUSY; | |
677 | spin_unlock_irq(&group->lock); | |
678 | /* Continue to hold reference on group until callback */ | |
679 | queue_work(mcast_wq, &group->work); | |
680 | } else { | |
681 | spin_unlock_irq(&group->lock); | |
682 | release_group(group); | |
683 | } | |
684 | ||
685 | deref_member(member); | |
686 | wait_for_completion(&member->comp); | |
687 | ib_sa_client_put(member->client); | |
688 | kfree(member); | |
689 | } | |
690 | EXPORT_SYMBOL(ib_sa_free_multicast); | |
691 | ||
692 | int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num, | |
693 | union ib_gid *mgid, struct ib_sa_mcmember_rec *rec) | |
694 | { | |
695 | struct mcast_device *dev; | |
696 | struct mcast_port *port; | |
697 | struct mcast_group *group; | |
698 | unsigned long flags; | |
699 | int ret = 0; | |
700 | ||
701 | dev = ib_get_client_data(device, &mcast_client); | |
702 | if (!dev) | |
703 | return -ENODEV; | |
704 | ||
705 | port = &dev->port[port_num - dev->start_port]; | |
706 | spin_lock_irqsave(&port->lock, flags); | |
707 | group = mcast_find(port, mgid); | |
708 | if (group) | |
709 | *rec = group->rec; | |
710 | else | |
711 | ret = -EADDRNOTAVAIL; | |
712 | spin_unlock_irqrestore(&port->lock, flags); | |
713 | ||
714 | return ret; | |
715 | } | |
716 | EXPORT_SYMBOL(ib_sa_get_mcmember_rec); | |
717 | ||
718 | int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num, | |
719 | struct ib_sa_mcmember_rec *rec, | |
720 | struct ib_ah_attr *ah_attr) | |
721 | { | |
722 | int ret; | |
723 | u16 gid_index; | |
724 | u8 p; | |
725 | ||
726 | ret = ib_find_cached_gid(device, &rec->port_gid, &p, &gid_index); | |
727 | if (ret) | |
728 | return ret; | |
729 | ||
730 | memset(ah_attr, 0, sizeof *ah_attr); | |
731 | ah_attr->dlid = be16_to_cpu(rec->mlid); | |
732 | ah_attr->sl = rec->sl; | |
733 | ah_attr->port_num = port_num; | |
734 | ah_attr->static_rate = rec->rate; | |
735 | ||
736 | ah_attr->ah_flags = IB_AH_GRH; | |
737 | ah_attr->grh.dgid = rec->mgid; | |
738 | ||
739 | ah_attr->grh.sgid_index = (u8) gid_index; | |
740 | ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label); | |
741 | ah_attr->grh.hop_limit = rec->hop_limit; | |
742 | ah_attr->grh.traffic_class = rec->traffic_class; | |
743 | ||
744 | return 0; | |
745 | } | |
746 | EXPORT_SYMBOL(ib_init_ah_from_mcmember); | |
747 | ||
547af765 SH |
748 | static void mcast_groups_event(struct mcast_port *port, |
749 | enum mcast_group_state state) | |
faec2f7b SH |
750 | { |
751 | struct mcast_group *group; | |
752 | struct rb_node *node; | |
753 | unsigned long flags; | |
754 | ||
755 | spin_lock_irqsave(&port->lock, flags); | |
756 | for (node = rb_first(&port->table); node; node = rb_next(node)) { | |
757 | group = rb_entry(node, struct mcast_group, node); | |
758 | spin_lock(&group->lock); | |
759 | if (group->state == MCAST_IDLE) { | |
760 | atomic_inc(&group->refcount); | |
761 | queue_work(mcast_wq, &group->work); | |
762 | } | |
547af765 SH |
763 | if (group->state != MCAST_GROUP_ERROR) |
764 | group->state = state; | |
faec2f7b SH |
765 | spin_unlock(&group->lock); |
766 | } | |
767 | spin_unlock_irqrestore(&port->lock, flags); | |
768 | } | |
769 | ||
770 | static void mcast_event_handler(struct ib_event_handler *handler, | |
771 | struct ib_event *event) | |
772 | { | |
773 | struct mcast_device *dev; | |
547af765 | 774 | int index; |
faec2f7b SH |
775 | |
776 | dev = container_of(handler, struct mcast_device, event_handler); | |
547af765 | 777 | index = event->element.port_num - dev->start_port; |
faec2f7b SH |
778 | |
779 | switch (event->event) { | |
780 | case IB_EVENT_PORT_ERR: | |
781 | case IB_EVENT_LID_CHANGE: | |
782 | case IB_EVENT_SM_CHANGE: | |
783 | case IB_EVENT_CLIENT_REREGISTER: | |
547af765 SH |
784 | mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR); |
785 | break; | |
786 | case IB_EVENT_PKEY_CHANGE: | |
787 | mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT); | |
faec2f7b SH |
788 | break; |
789 | default: | |
790 | break; | |
791 | } | |
792 | } | |
793 | ||
794 | static void mcast_add_one(struct ib_device *device) | |
795 | { | |
796 | struct mcast_device *dev; | |
797 | struct mcast_port *port; | |
798 | int i; | |
799 | ||
800 | if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) | |
801 | return; | |
802 | ||
803 | dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port, | |
804 | GFP_KERNEL); | |
805 | if (!dev) | |
806 | return; | |
807 | ||
808 | if (device->node_type == RDMA_NODE_IB_SWITCH) | |
809 | dev->start_port = dev->end_port = 0; | |
810 | else { | |
811 | dev->start_port = 1; | |
812 | dev->end_port = device->phys_port_cnt; | |
813 | } | |
814 | ||
815 | for (i = 0; i <= dev->end_port - dev->start_port; i++) { | |
816 | port = &dev->port[i]; | |
817 | port->dev = dev; | |
818 | port->port_num = dev->start_port + i; | |
819 | spin_lock_init(&port->lock); | |
820 | port->table = RB_ROOT; | |
821 | init_completion(&port->comp); | |
822 | atomic_set(&port->refcount, 1); | |
823 | } | |
824 | ||
825 | dev->device = device; | |
826 | ib_set_client_data(device, &mcast_client, dev); | |
827 | ||
828 | INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler); | |
829 | ib_register_event_handler(&dev->event_handler); | |
830 | } | |
831 | ||
832 | static void mcast_remove_one(struct ib_device *device) | |
833 | { | |
834 | struct mcast_device *dev; | |
835 | struct mcast_port *port; | |
836 | int i; | |
837 | ||
838 | dev = ib_get_client_data(device, &mcast_client); | |
839 | if (!dev) | |
840 | return; | |
841 | ||
842 | ib_unregister_event_handler(&dev->event_handler); | |
843 | flush_workqueue(mcast_wq); | |
844 | ||
845 | for (i = 0; i <= dev->end_port - dev->start_port; i++) { | |
846 | port = &dev->port[i]; | |
847 | deref_port(port); | |
848 | wait_for_completion(&port->comp); | |
849 | } | |
850 | ||
851 | kfree(dev); | |
852 | } | |
853 | ||
854 | int mcast_init(void) | |
855 | { | |
856 | int ret; | |
857 | ||
858 | mcast_wq = create_singlethread_workqueue("ib_mcast"); | |
859 | if (!mcast_wq) | |
860 | return -ENOMEM; | |
861 | ||
862 | ib_sa_register_client(&sa_client); | |
863 | ||
864 | ret = ib_register_client(&mcast_client); | |
865 | if (ret) | |
866 | goto err; | |
867 | return 0; | |
868 | ||
869 | err: | |
870 | ib_sa_unregister_client(&sa_client); | |
871 | destroy_workqueue(mcast_wq); | |
872 | return ret; | |
873 | } | |
874 | ||
875 | void mcast_cleanup(void) | |
876 | { | |
877 | ib_unregister_client(&mcast_client); | |
878 | ib_sa_unregister_client(&sa_client); | |
879 | destroy_workqueue(mcast_wq); | |
880 | } |