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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> | |
b108d976 | 37 | #include <linux/export.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
faec2f7b SH |
39 | #include <linux/bitops.h> |
40 | #include <linux/random.h> | |
41 | ||
42 | #include <rdma/ib_cache.h> | |
43 | #include "sa.h" | |
44 | ||
45 | static void mcast_add_one(struct ib_device *device); | |
7c1eb45a | 46 | static void mcast_remove_one(struct ib_device *device, void *client_data); |
faec2f7b SH |
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 { | |
faec2f7b SH |
78 | MCAST_JOINING, |
79 | MCAST_MEMBER, | |
547af765 SH |
80 | MCAST_ERROR, |
81 | }; | |
82 | ||
83 | enum mcast_group_state { | |
84 | MCAST_IDLE, | |
faec2f7b | 85 | MCAST_BUSY, |
547af765 SH |
86 | MCAST_GROUP_ERROR, |
87 | MCAST_PKEY_EVENT | |
88 | }; | |
89 | ||
90 | enum { | |
91 | MCAST_INVALID_PKEY_INDEX = 0xFFFF | |
faec2f7b SH |
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; | |
cd6e9b7e | 105 | int members[NUM_JOIN_MEMBERSHIP_TYPES]; |
faec2f7b | 106 | atomic_t refcount; |
547af765 | 107 | enum mcast_group_state state; |
faec2f7b | 108 | struct ib_sa_query *query; |
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 | /* | |
cd6e9b7e ES |
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 | |
faec2f7b SH |
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 | ||
cd6e9b7e | 232 | for (i = 0; i < NUM_JOIN_MEMBERSHIP_TYPES; i++, join_state >>= 1) |
faec2f7b SH |
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 | ||
cd6e9b7e | 248 | for (i = 0; i < NUM_JOIN_MEMBERSHIP_TYPES; i++) |
faec2f7b SH |
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); | |
68c6bcdd | 342 | return (ret > 0) ? 0 : ret; |
faec2f7b SH |
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; | |
e1d7806d | 353 | group->leave_state = leave_state; |
faec2f7b SH |
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); | |
68c6bcdd | 362 | return (ret > 0) ? 0 : ret; |
faec2f7b SH |
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; | |
547af765 SH |
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); | |
faec2f7b SH |
395 | |
396 | spin_lock_irq(&group->lock); | |
547af765 SH |
397 | if (group->state == MCAST_PKEY_EVENT && !ret && |
398 | group->pkey_index == pkey_index) | |
399 | goto out; | |
400 | ||
faec2f7b SH |
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; | |
547af765 | 419 | out: |
faec2f7b SH |
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) || | |
547af765 | 436 | (group->state != MCAST_BUSY)) { |
faec2f7b | 437 | |
547af765 | 438 | if (group->state != MCAST_BUSY) { |
faec2f7b SH |
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; | |
547af765 | 515 | u16 pkey_index = MCAST_INVALID_PKEY_INDEX; |
faec2f7b SH |
516 | |
517 | if (status) | |
518 | process_join_error(group, status); | |
519 | else { | |
514f3ddf | 520 | int mgids_changed, is_mgid0; |
d3a2418e BVA |
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; | |
547af765 | 526 | |
faec2f7b | 527 | spin_lock_irq(&group->port->lock); |
547af765 SH |
528 | if (group->state == MCAST_BUSY && |
529 | group->pkey_index == MCAST_INVALID_PKEY_INDEX) | |
530 | group->pkey_index = pkey_index; | |
514f3ddf JM |
531 | mgids_changed = memcmp(&rec->mgid, &group->rec.mgid, |
532 | sizeof(group->rec.mgid)); | |
533 | group->rec = *rec; | |
534 | if (mgids_changed) { | |
faec2f7b | 535 | rb_erase(&group->node, &group->port->table); |
514f3ddf JM |
536 | is_mgid0 = !memcmp(&mgid0, &group->rec.mgid, |
537 | sizeof(mgid0)); | |
538 | mcast_insert(group->port, group, is_mgid0); | |
faec2f7b SH |
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 | ||
e1d7806d YE |
550 | if (status && group->retries > 0 && |
551 | !send_leave(group, group->leave_state)) | |
552 | group->retries--; | |
553 | else | |
554 | mcast_work_handler(&group->work); | |
faec2f7b SH |
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 | ||
e1d7806d | 577 | group->retries = 3; |
faec2f7b SH |
578 | group->port = port; |
579 | group->rec.mgid = *mgid; | |
547af765 | 580 | group->pkey_index = MCAST_INVALID_PKEY_INDEX; |
faec2f7b SH |
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, | |
bee3c3c9 MS |
721 | struct net_device *ndev, |
722 | enum ib_gid_type gid_type, | |
90898850 | 723 | struct rdma_ah_attr *ah_attr) |
faec2f7b SH |
724 | { |
725 | int ret; | |
726 | u16 gid_index; | |
727 | u8 p; | |
728 | ||
bee3c3c9 MS |
729 | if (rdma_protocol_roce(device, port_num)) { |
730 | ret = ib_find_cached_gid_by_port(device, &rec->port_gid, | |
731 | gid_type, port_num, | |
732 | ndev, | |
733 | &gid_index); | |
734 | } else if (rdma_protocol_ib(device, port_num)) { | |
735 | ret = ib_find_cached_gid(device, &rec->port_gid, | |
736 | IB_GID_TYPE_IB, NULL, &p, | |
737 | &gid_index); | |
738 | } else { | |
739 | ret = -EINVAL; | |
740 | } | |
741 | ||
faec2f7b SH |
742 | if (ret) |
743 | return ret; | |
744 | ||
745 | memset(ah_attr, 0, sizeof *ah_attr); | |
44c58487 | 746 | ah_attr->type = rdma_ah_find_type(device, port_num); |
faec2f7b | 747 | |
d8966fcd DC |
748 | rdma_ah_set_dlid(ah_attr, be16_to_cpu(rec->mlid)); |
749 | rdma_ah_set_sl(ah_attr, rec->sl); | |
750 | rdma_ah_set_port_num(ah_attr, port_num); | |
751 | rdma_ah_set_static_rate(ah_attr, rec->rate); | |
faec2f7b | 752 | |
d8966fcd DC |
753 | rdma_ah_set_grh(ah_attr, &rec->mgid, |
754 | be32_to_cpu(rec->flow_label), | |
755 | (u8)gid_index, | |
756 | rec->hop_limit, | |
757 | rec->traffic_class); | |
faec2f7b SH |
758 | return 0; |
759 | } | |
760 | EXPORT_SYMBOL(ib_init_ah_from_mcmember); | |
761 | ||
547af765 SH |
762 | static void mcast_groups_event(struct mcast_port *port, |
763 | enum mcast_group_state state) | |
faec2f7b SH |
764 | { |
765 | struct mcast_group *group; | |
766 | struct rb_node *node; | |
767 | unsigned long flags; | |
768 | ||
769 | spin_lock_irqsave(&port->lock, flags); | |
770 | for (node = rb_first(&port->table); node; node = rb_next(node)) { | |
771 | group = rb_entry(node, struct mcast_group, node); | |
772 | spin_lock(&group->lock); | |
773 | if (group->state == MCAST_IDLE) { | |
774 | atomic_inc(&group->refcount); | |
775 | queue_work(mcast_wq, &group->work); | |
776 | } | |
547af765 SH |
777 | if (group->state != MCAST_GROUP_ERROR) |
778 | group->state = state; | |
faec2f7b SH |
779 | spin_unlock(&group->lock); |
780 | } | |
781 | spin_unlock_irqrestore(&port->lock, flags); | |
782 | } | |
783 | ||
784 | static void mcast_event_handler(struct ib_event_handler *handler, | |
785 | struct ib_event *event) | |
786 | { | |
787 | struct mcast_device *dev; | |
547af765 | 788 | int index; |
faec2f7b SH |
789 | |
790 | dev = container_of(handler, struct mcast_device, event_handler); | |
9247a8eb | 791 | if (!rdma_cap_ib_mcast(dev->device, event->element.port_num)) |
fac70d51 EC |
792 | return; |
793 | ||
547af765 | 794 | index = event->element.port_num - dev->start_port; |
faec2f7b SH |
795 | |
796 | switch (event->event) { | |
797 | case IB_EVENT_PORT_ERR: | |
798 | case IB_EVENT_LID_CHANGE: | |
799 | case IB_EVENT_SM_CHANGE: | |
800 | case IB_EVENT_CLIENT_REREGISTER: | |
547af765 SH |
801 | mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR); |
802 | break; | |
803 | case IB_EVENT_PKEY_CHANGE: | |
804 | mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT); | |
faec2f7b SH |
805 | break; |
806 | default: | |
807 | break; | |
808 | } | |
809 | } | |
810 | ||
811 | static void mcast_add_one(struct ib_device *device) | |
812 | { | |
813 | struct mcast_device *dev; | |
814 | struct mcast_port *port; | |
815 | int i; | |
fac70d51 | 816 | int count = 0; |
faec2f7b | 817 | |
faec2f7b SH |
818 | dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port, |
819 | GFP_KERNEL); | |
820 | if (!dev) | |
821 | return; | |
822 | ||
4139032b HR |
823 | dev->start_port = rdma_start_port(device); |
824 | dev->end_port = rdma_end_port(device); | |
faec2f7b SH |
825 | |
826 | for (i = 0; i <= dev->end_port - dev->start_port; i++) { | |
a31ad3b0 | 827 | if (!rdma_cap_ib_mcast(device, dev->start_port + i)) |
fac70d51 | 828 | continue; |
faec2f7b SH |
829 | port = &dev->port[i]; |
830 | port->dev = dev; | |
831 | port->port_num = dev->start_port + i; | |
832 | spin_lock_init(&port->lock); | |
833 | port->table = RB_ROOT; | |
834 | init_completion(&port->comp); | |
835 | atomic_set(&port->refcount, 1); | |
fac70d51 EC |
836 | ++count; |
837 | } | |
838 | ||
839 | if (!count) { | |
840 | kfree(dev); | |
841 | return; | |
faec2f7b SH |
842 | } |
843 | ||
844 | dev->device = device; | |
845 | ib_set_client_data(device, &mcast_client, dev); | |
846 | ||
847 | INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler); | |
848 | ib_register_event_handler(&dev->event_handler); | |
849 | } | |
850 | ||
7c1eb45a | 851 | static void mcast_remove_one(struct ib_device *device, void *client_data) |
faec2f7b | 852 | { |
7c1eb45a | 853 | struct mcast_device *dev = client_data; |
faec2f7b SH |
854 | struct mcast_port *port; |
855 | int i; | |
856 | ||
faec2f7b SH |
857 | if (!dev) |
858 | return; | |
859 | ||
860 | ib_unregister_event_handler(&dev->event_handler); | |
861 | flush_workqueue(mcast_wq); | |
862 | ||
863 | for (i = 0; i <= dev->end_port - dev->start_port; i++) { | |
a31ad3b0 | 864 | if (rdma_cap_ib_mcast(device, dev->start_port + i)) { |
fac70d51 EC |
865 | port = &dev->port[i]; |
866 | deref_port(port); | |
867 | wait_for_completion(&port->comp); | |
868 | } | |
faec2f7b SH |
869 | } |
870 | ||
871 | kfree(dev); | |
872 | } | |
873 | ||
874 | int mcast_init(void) | |
875 | { | |
876 | int ret; | |
877 | ||
01013cdf | 878 | mcast_wq = alloc_ordered_workqueue("ib_mcast", WQ_MEM_RECLAIM); |
faec2f7b SH |
879 | if (!mcast_wq) |
880 | return -ENOMEM; | |
881 | ||
882 | ib_sa_register_client(&sa_client); | |
883 | ||
884 | ret = ib_register_client(&mcast_client); | |
885 | if (ret) | |
886 | goto err; | |
887 | return 0; | |
888 | ||
889 | err: | |
890 | ib_sa_unregister_client(&sa_client); | |
891 | destroy_workqueue(mcast_wq); | |
892 | return ret; | |
893 | } | |
894 | ||
895 | void mcast_cleanup(void) | |
896 | { | |
897 | ib_unregister_client(&mcast_client); | |
898 | ib_sa_unregister_client(&sa_client); | |
899 | destroy_workqueue(mcast_wq); | |
900 | } |