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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 SH |
108 | struct ib_sa_query *query; |
109 | int query_id; | |
547af765 | 110 | u16 pkey_index; |
e1d7806d YE |
111 | u8 leave_state; |
112 | int retries; | |
faec2f7b SH |
113 | }; |
114 | ||
115 | struct mcast_member { | |
116 | struct ib_sa_multicast multicast; | |
117 | struct ib_sa_client *client; | |
118 | struct mcast_group *group; | |
119 | struct list_head list; | |
120 | enum mcast_state state; | |
121 | atomic_t refcount; | |
122 | struct completion comp; | |
123 | }; | |
124 | ||
125 | static void join_handler(int status, struct ib_sa_mcmember_rec *rec, | |
126 | void *context); | |
127 | static void leave_handler(int status, struct ib_sa_mcmember_rec *rec, | |
128 | void *context); | |
129 | ||
130 | static struct mcast_group *mcast_find(struct mcast_port *port, | |
131 | union ib_gid *mgid) | |
132 | { | |
133 | struct rb_node *node = port->table.rb_node; | |
134 | struct mcast_group *group; | |
135 | int ret; | |
136 | ||
137 | while (node) { | |
138 | group = rb_entry(node, struct mcast_group, node); | |
139 | ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid); | |
140 | if (!ret) | |
141 | return group; | |
142 | ||
143 | if (ret < 0) | |
144 | node = node->rb_left; | |
145 | else | |
146 | node = node->rb_right; | |
147 | } | |
148 | return NULL; | |
149 | } | |
150 | ||
151 | static struct mcast_group *mcast_insert(struct mcast_port *port, | |
152 | struct mcast_group *group, | |
153 | int allow_duplicates) | |
154 | { | |
155 | struct rb_node **link = &port->table.rb_node; | |
156 | struct rb_node *parent = NULL; | |
157 | struct mcast_group *cur_group; | |
158 | int ret; | |
159 | ||
160 | while (*link) { | |
161 | parent = *link; | |
162 | cur_group = rb_entry(parent, struct mcast_group, node); | |
163 | ||
164 | ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw, | |
165 | sizeof group->rec.mgid); | |
166 | if (ret < 0) | |
167 | link = &(*link)->rb_left; | |
168 | else if (ret > 0) | |
169 | link = &(*link)->rb_right; | |
170 | else if (allow_duplicates) | |
171 | link = &(*link)->rb_left; | |
172 | else | |
173 | return cur_group; | |
174 | } | |
175 | rb_link_node(&group->node, parent, link); | |
176 | rb_insert_color(&group->node, &port->table); | |
177 | return NULL; | |
178 | } | |
179 | ||
180 | static void deref_port(struct mcast_port *port) | |
181 | { | |
182 | if (atomic_dec_and_test(&port->refcount)) | |
183 | complete(&port->comp); | |
184 | } | |
185 | ||
186 | static void release_group(struct mcast_group *group) | |
187 | { | |
188 | struct mcast_port *port = group->port; | |
189 | unsigned long flags; | |
190 | ||
191 | spin_lock_irqsave(&port->lock, flags); | |
192 | if (atomic_dec_and_test(&group->refcount)) { | |
193 | rb_erase(&group->node, &port->table); | |
194 | spin_unlock_irqrestore(&port->lock, flags); | |
195 | kfree(group); | |
196 | deref_port(port); | |
197 | } else | |
198 | spin_unlock_irqrestore(&port->lock, flags); | |
199 | } | |
200 | ||
201 | static void deref_member(struct mcast_member *member) | |
202 | { | |
203 | if (atomic_dec_and_test(&member->refcount)) | |
204 | complete(&member->comp); | |
205 | } | |
206 | ||
207 | static void queue_join(struct mcast_member *member) | |
208 | { | |
209 | struct mcast_group *group = member->group; | |
210 | unsigned long flags; | |
211 | ||
212 | spin_lock_irqsave(&group->lock, flags); | |
57cb61d5 | 213 | list_add_tail(&member->list, &group->pending_list); |
faec2f7b SH |
214 | if (group->state == MCAST_IDLE) { |
215 | group->state = MCAST_BUSY; | |
216 | atomic_inc(&group->refcount); | |
217 | queue_work(mcast_wq, &group->work); | |
218 | } | |
219 | spin_unlock_irqrestore(&group->lock, flags); | |
220 | } | |
221 | ||
222 | /* | |
cd6e9b7e ES |
223 | * A multicast group has four types of members: full member, non member, |
224 | * sendonly non member and sendonly full member. | |
225 | * We need to keep track of the number of members of each | |
faec2f7b SH |
226 | * type based on their join state. Adjust the number of members the belong to |
227 | * the specified join states. | |
228 | */ | |
229 | static void adjust_membership(struct mcast_group *group, u8 join_state, int inc) | |
230 | { | |
231 | int i; | |
232 | ||
cd6e9b7e | 233 | for (i = 0; i < NUM_JOIN_MEMBERSHIP_TYPES; i++, join_state >>= 1) |
faec2f7b SH |
234 | if (join_state & 0x1) |
235 | group->members[i] += inc; | |
236 | } | |
237 | ||
238 | /* | |
239 | * If a multicast group has zero members left for a particular join state, but | |
240 | * the group is still a member with the SA, we need to leave that join state. | |
241 | * Determine which join states we still belong to, but that do not have any | |
242 | * active members. | |
243 | */ | |
244 | static u8 get_leave_state(struct mcast_group *group) | |
245 | { | |
246 | u8 leave_state = 0; | |
247 | int i; | |
248 | ||
cd6e9b7e | 249 | for (i = 0; i < NUM_JOIN_MEMBERSHIP_TYPES; i++) |
faec2f7b SH |
250 | if (!group->members[i]) |
251 | leave_state |= (0x1 << i); | |
252 | ||
253 | return leave_state & group->rec.join_state; | |
254 | } | |
255 | ||
256 | static int check_selector(ib_sa_comp_mask comp_mask, | |
257 | ib_sa_comp_mask selector_mask, | |
258 | ib_sa_comp_mask value_mask, | |
259 | u8 selector, u8 src_value, u8 dst_value) | |
260 | { | |
261 | int err; | |
262 | ||
263 | if (!(comp_mask & selector_mask) || !(comp_mask & value_mask)) | |
264 | return 0; | |
265 | ||
266 | switch (selector) { | |
267 | case IB_SA_GT: | |
268 | err = (src_value <= dst_value); | |
269 | break; | |
270 | case IB_SA_LT: | |
271 | err = (src_value >= dst_value); | |
272 | break; | |
273 | case IB_SA_EQ: | |
274 | err = (src_value != dst_value); | |
275 | break; | |
276 | default: | |
277 | err = 0; | |
278 | break; | |
279 | } | |
280 | ||
281 | return err; | |
282 | } | |
283 | ||
284 | static int cmp_rec(struct ib_sa_mcmember_rec *src, | |
285 | struct ib_sa_mcmember_rec *dst, ib_sa_comp_mask comp_mask) | |
286 | { | |
287 | /* MGID must already match */ | |
288 | ||
289 | if (comp_mask & IB_SA_MCMEMBER_REC_PORT_GID && | |
290 | memcmp(&src->port_gid, &dst->port_gid, sizeof src->port_gid)) | |
291 | return -EINVAL; | |
292 | if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey) | |
293 | return -EINVAL; | |
294 | if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid) | |
295 | return -EINVAL; | |
296 | if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR, | |
297 | IB_SA_MCMEMBER_REC_MTU, dst->mtu_selector, | |
298 | src->mtu, dst->mtu)) | |
299 | return -EINVAL; | |
300 | if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS && | |
301 | src->traffic_class != dst->traffic_class) | |
302 | return -EINVAL; | |
303 | if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey) | |
304 | return -EINVAL; | |
305 | if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR, | |
306 | IB_SA_MCMEMBER_REC_RATE, dst->rate_selector, | |
307 | src->rate, dst->rate)) | |
308 | return -EINVAL; | |
309 | if (check_selector(comp_mask, | |
310 | IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR, | |
311 | IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME, | |
312 | dst->packet_life_time_selector, | |
313 | src->packet_life_time, dst->packet_life_time)) | |
314 | return -EINVAL; | |
315 | if (comp_mask & IB_SA_MCMEMBER_REC_SL && src->sl != dst->sl) | |
316 | return -EINVAL; | |
317 | if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL && | |
318 | src->flow_label != dst->flow_label) | |
319 | return -EINVAL; | |
320 | if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT && | |
321 | src->hop_limit != dst->hop_limit) | |
322 | return -EINVAL; | |
323 | if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && src->scope != dst->scope) | |
324 | return -EINVAL; | |
325 | ||
326 | /* join_state checked separately, proxy_join ignored */ | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static int send_join(struct mcast_group *group, struct mcast_member *member) | |
332 | { | |
333 | struct mcast_port *port = group->port; | |
334 | int ret; | |
335 | ||
336 | group->last_join = member; | |
337 | ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device, | |
338 | port->port_num, IB_MGMT_METHOD_SET, | |
339 | &member->multicast.rec, | |
340 | member->multicast.comp_mask, | |
341 | 3000, GFP_KERNEL, join_handler, group, | |
342 | &group->query); | |
343 | if (ret >= 0) { | |
344 | group->query_id = ret; | |
345 | ret = 0; | |
346 | } | |
347 | return ret; | |
348 | } | |
349 | ||
350 | static int send_leave(struct mcast_group *group, u8 leave_state) | |
351 | { | |
352 | struct mcast_port *port = group->port; | |
353 | struct ib_sa_mcmember_rec rec; | |
354 | int ret; | |
355 | ||
356 | rec = group->rec; | |
357 | rec.join_state = leave_state; | |
e1d7806d | 358 | group->leave_state = leave_state; |
faec2f7b SH |
359 | |
360 | ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device, | |
361 | port->port_num, IB_SA_METHOD_DELETE, &rec, | |
362 | IB_SA_MCMEMBER_REC_MGID | | |
363 | IB_SA_MCMEMBER_REC_PORT_GID | | |
364 | IB_SA_MCMEMBER_REC_JOIN_STATE, | |
365 | 3000, GFP_KERNEL, leave_handler, | |
366 | group, &group->query); | |
367 | if (ret >= 0) { | |
368 | group->query_id = ret; | |
369 | ret = 0; | |
370 | } | |
371 | return ret; | |
372 | } | |
373 | ||
374 | static void join_group(struct mcast_group *group, struct mcast_member *member, | |
375 | u8 join_state) | |
376 | { | |
377 | member->state = MCAST_MEMBER; | |
378 | adjust_membership(group, join_state, 1); | |
379 | group->rec.join_state |= join_state; | |
380 | member->multicast.rec = group->rec; | |
381 | member->multicast.rec.join_state = join_state; | |
382 | list_move(&member->list, &group->active_list); | |
383 | } | |
384 | ||
385 | static int fail_join(struct mcast_group *group, struct mcast_member *member, | |
386 | int status) | |
387 | { | |
388 | spin_lock_irq(&group->lock); | |
389 | list_del_init(&member->list); | |
390 | spin_unlock_irq(&group->lock); | |
391 | return member->multicast.callback(status, &member->multicast); | |
392 | } | |
393 | ||
394 | static void process_group_error(struct mcast_group *group) | |
395 | { | |
396 | struct mcast_member *member; | |
547af765 SH |
397 | int ret = 0; |
398 | u16 pkey_index; | |
399 | ||
400 | if (group->state == MCAST_PKEY_EVENT) | |
401 | ret = ib_find_pkey(group->port->dev->device, | |
402 | group->port->port_num, | |
403 | be16_to_cpu(group->rec.pkey), &pkey_index); | |
faec2f7b SH |
404 | |
405 | spin_lock_irq(&group->lock); | |
547af765 SH |
406 | if (group->state == MCAST_PKEY_EVENT && !ret && |
407 | group->pkey_index == pkey_index) | |
408 | goto out; | |
409 | ||
faec2f7b SH |
410 | while (!list_empty(&group->active_list)) { |
411 | member = list_entry(group->active_list.next, | |
412 | struct mcast_member, list); | |
413 | atomic_inc(&member->refcount); | |
414 | list_del_init(&member->list); | |
415 | adjust_membership(group, member->multicast.rec.join_state, -1); | |
416 | member->state = MCAST_ERROR; | |
417 | spin_unlock_irq(&group->lock); | |
418 | ||
419 | ret = member->multicast.callback(-ENETRESET, | |
420 | &member->multicast); | |
421 | deref_member(member); | |
422 | if (ret) | |
423 | ib_sa_free_multicast(&member->multicast); | |
424 | spin_lock_irq(&group->lock); | |
425 | } | |
426 | ||
427 | group->rec.join_state = 0; | |
547af765 | 428 | out: |
faec2f7b SH |
429 | group->state = MCAST_BUSY; |
430 | spin_unlock_irq(&group->lock); | |
431 | } | |
432 | ||
433 | static void mcast_work_handler(struct work_struct *work) | |
434 | { | |
435 | struct mcast_group *group; | |
436 | struct mcast_member *member; | |
437 | struct ib_sa_multicast *multicast; | |
438 | int status, ret; | |
439 | u8 join_state; | |
440 | ||
441 | group = container_of(work, typeof(*group), work); | |
442 | retest: | |
443 | spin_lock_irq(&group->lock); | |
444 | while (!list_empty(&group->pending_list) || | |
547af765 | 445 | (group->state != MCAST_BUSY)) { |
faec2f7b | 446 | |
547af765 | 447 | if (group->state != MCAST_BUSY) { |
faec2f7b SH |
448 | spin_unlock_irq(&group->lock); |
449 | process_group_error(group); | |
450 | goto retest; | |
451 | } | |
452 | ||
453 | member = list_entry(group->pending_list.next, | |
454 | struct mcast_member, list); | |
455 | multicast = &member->multicast; | |
456 | join_state = multicast->rec.join_state; | |
457 | atomic_inc(&member->refcount); | |
458 | ||
459 | if (join_state == (group->rec.join_state & join_state)) { | |
460 | status = cmp_rec(&group->rec, &multicast->rec, | |
461 | multicast->comp_mask); | |
462 | if (!status) | |
463 | join_group(group, member, join_state); | |
464 | else | |
465 | list_del_init(&member->list); | |
466 | spin_unlock_irq(&group->lock); | |
467 | ret = multicast->callback(status, multicast); | |
468 | } else { | |
469 | spin_unlock_irq(&group->lock); | |
470 | status = send_join(group, member); | |
471 | if (!status) { | |
472 | deref_member(member); | |
473 | return; | |
474 | } | |
475 | ret = fail_join(group, member, status); | |
476 | } | |
477 | ||
478 | deref_member(member); | |
479 | if (ret) | |
480 | ib_sa_free_multicast(&member->multicast); | |
481 | spin_lock_irq(&group->lock); | |
482 | } | |
483 | ||
484 | join_state = get_leave_state(group); | |
485 | if (join_state) { | |
486 | group->rec.join_state &= ~join_state; | |
487 | spin_unlock_irq(&group->lock); | |
488 | if (send_leave(group, join_state)) | |
489 | goto retest; | |
490 | } else { | |
491 | group->state = MCAST_IDLE; | |
492 | spin_unlock_irq(&group->lock); | |
493 | release_group(group); | |
494 | } | |
495 | } | |
496 | ||
497 | /* | |
498 | * Fail a join request if it is still active - at the head of the pending queue. | |
499 | */ | |
500 | static void process_join_error(struct mcast_group *group, int status) | |
501 | { | |
502 | struct mcast_member *member; | |
503 | int ret; | |
504 | ||
505 | spin_lock_irq(&group->lock); | |
506 | member = list_entry(group->pending_list.next, | |
507 | struct mcast_member, list); | |
508 | if (group->last_join == member) { | |
509 | atomic_inc(&member->refcount); | |
510 | list_del_init(&member->list); | |
511 | spin_unlock_irq(&group->lock); | |
512 | ret = member->multicast.callback(status, &member->multicast); | |
513 | deref_member(member); | |
514 | if (ret) | |
515 | ib_sa_free_multicast(&member->multicast); | |
516 | } else | |
517 | spin_unlock_irq(&group->lock); | |
518 | } | |
519 | ||
520 | static void join_handler(int status, struct ib_sa_mcmember_rec *rec, | |
521 | void *context) | |
522 | { | |
523 | struct mcast_group *group = context; | |
547af765 | 524 | u16 pkey_index = MCAST_INVALID_PKEY_INDEX; |
faec2f7b SH |
525 | |
526 | if (status) | |
527 | process_join_error(group, status); | |
528 | else { | |
514f3ddf | 529 | int mgids_changed, is_mgid0; |
547af765 SH |
530 | ib_find_pkey(group->port->dev->device, group->port->port_num, |
531 | be16_to_cpu(rec->pkey), &pkey_index); | |
532 | ||
faec2f7b | 533 | spin_lock_irq(&group->port->lock); |
547af765 SH |
534 | if (group->state == MCAST_BUSY && |
535 | group->pkey_index == MCAST_INVALID_PKEY_INDEX) | |
536 | group->pkey_index = pkey_index; | |
514f3ddf JM |
537 | mgids_changed = memcmp(&rec->mgid, &group->rec.mgid, |
538 | sizeof(group->rec.mgid)); | |
539 | group->rec = *rec; | |
540 | if (mgids_changed) { | |
faec2f7b | 541 | rb_erase(&group->node, &group->port->table); |
514f3ddf JM |
542 | is_mgid0 = !memcmp(&mgid0, &group->rec.mgid, |
543 | sizeof(mgid0)); | |
544 | mcast_insert(group->port, group, is_mgid0); | |
faec2f7b SH |
545 | } |
546 | spin_unlock_irq(&group->port->lock); | |
547 | } | |
548 | mcast_work_handler(&group->work); | |
549 | } | |
550 | ||
551 | static void leave_handler(int status, struct ib_sa_mcmember_rec *rec, | |
552 | void *context) | |
553 | { | |
554 | struct mcast_group *group = context; | |
555 | ||
e1d7806d YE |
556 | if (status && group->retries > 0 && |
557 | !send_leave(group, group->leave_state)) | |
558 | group->retries--; | |
559 | else | |
560 | mcast_work_handler(&group->work); | |
faec2f7b SH |
561 | } |
562 | ||
563 | static struct mcast_group *acquire_group(struct mcast_port *port, | |
564 | union ib_gid *mgid, gfp_t gfp_mask) | |
565 | { | |
566 | struct mcast_group *group, *cur_group; | |
567 | unsigned long flags; | |
568 | int is_mgid0; | |
569 | ||
570 | is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0); | |
571 | if (!is_mgid0) { | |
572 | spin_lock_irqsave(&port->lock, flags); | |
573 | group = mcast_find(port, mgid); | |
574 | if (group) | |
575 | goto found; | |
576 | spin_unlock_irqrestore(&port->lock, flags); | |
577 | } | |
578 | ||
579 | group = kzalloc(sizeof *group, gfp_mask); | |
580 | if (!group) | |
581 | return NULL; | |
582 | ||
e1d7806d | 583 | group->retries = 3; |
faec2f7b SH |
584 | group->port = port; |
585 | group->rec.mgid = *mgid; | |
547af765 | 586 | group->pkey_index = MCAST_INVALID_PKEY_INDEX; |
faec2f7b SH |
587 | INIT_LIST_HEAD(&group->pending_list); |
588 | INIT_LIST_HEAD(&group->active_list); | |
589 | INIT_WORK(&group->work, mcast_work_handler); | |
590 | spin_lock_init(&group->lock); | |
591 | ||
592 | spin_lock_irqsave(&port->lock, flags); | |
593 | cur_group = mcast_insert(port, group, is_mgid0); | |
594 | if (cur_group) { | |
595 | kfree(group); | |
596 | group = cur_group; | |
597 | } else | |
598 | atomic_inc(&port->refcount); | |
599 | found: | |
600 | atomic_inc(&group->refcount); | |
601 | spin_unlock_irqrestore(&port->lock, flags); | |
602 | return group; | |
603 | } | |
604 | ||
605 | /* | |
606 | * We serialize all join requests to a single group to make our lives much | |
607 | * easier. Otherwise, two users could try to join the same group | |
608 | * simultaneously, with different configurations, one could leave while the | |
609 | * join is in progress, etc., which makes locking around error recovery | |
610 | * difficult. | |
611 | */ | |
612 | struct ib_sa_multicast * | |
613 | ib_sa_join_multicast(struct ib_sa_client *client, | |
614 | struct ib_device *device, u8 port_num, | |
615 | struct ib_sa_mcmember_rec *rec, | |
616 | ib_sa_comp_mask comp_mask, gfp_t gfp_mask, | |
617 | int (*callback)(int status, | |
618 | struct ib_sa_multicast *multicast), | |
619 | void *context) | |
620 | { | |
621 | struct mcast_device *dev; | |
622 | struct mcast_member *member; | |
623 | struct ib_sa_multicast *multicast; | |
624 | int ret; | |
625 | ||
626 | dev = ib_get_client_data(device, &mcast_client); | |
627 | if (!dev) | |
628 | return ERR_PTR(-ENODEV); | |
629 | ||
630 | member = kmalloc(sizeof *member, gfp_mask); | |
631 | if (!member) | |
632 | return ERR_PTR(-ENOMEM); | |
633 | ||
634 | ib_sa_client_get(client); | |
635 | member->client = client; | |
636 | member->multicast.rec = *rec; | |
637 | member->multicast.comp_mask = comp_mask; | |
638 | member->multicast.callback = callback; | |
639 | member->multicast.context = context; | |
640 | init_completion(&member->comp); | |
641 | atomic_set(&member->refcount, 1); | |
642 | member->state = MCAST_JOINING; | |
643 | ||
644 | member->group = acquire_group(&dev->port[port_num - dev->start_port], | |
645 | &rec->mgid, gfp_mask); | |
646 | if (!member->group) { | |
647 | ret = -ENOMEM; | |
648 | goto err; | |
649 | } | |
650 | ||
651 | /* | |
652 | * The user will get the multicast structure in their callback. They | |
653 | * could then free the multicast structure before we can return from | |
654 | * this routine. So we save the pointer to return before queuing | |
655 | * any callback. | |
656 | */ | |
657 | multicast = &member->multicast; | |
658 | queue_join(member); | |
659 | return multicast; | |
660 | ||
661 | err: | |
662 | ib_sa_client_put(client); | |
663 | kfree(member); | |
664 | return ERR_PTR(ret); | |
665 | } | |
666 | EXPORT_SYMBOL(ib_sa_join_multicast); | |
667 | ||
668 | void ib_sa_free_multicast(struct ib_sa_multicast *multicast) | |
669 | { | |
670 | struct mcast_member *member; | |
671 | struct mcast_group *group; | |
672 | ||
673 | member = container_of(multicast, struct mcast_member, multicast); | |
674 | group = member->group; | |
675 | ||
676 | spin_lock_irq(&group->lock); | |
677 | if (member->state == MCAST_MEMBER) | |
678 | adjust_membership(group, multicast->rec.join_state, -1); | |
679 | ||
680 | list_del_init(&member->list); | |
681 | ||
682 | if (group->state == MCAST_IDLE) { | |
683 | group->state = MCAST_BUSY; | |
684 | spin_unlock_irq(&group->lock); | |
685 | /* Continue to hold reference on group until callback */ | |
686 | queue_work(mcast_wq, &group->work); | |
687 | } else { | |
688 | spin_unlock_irq(&group->lock); | |
689 | release_group(group); | |
690 | } | |
691 | ||
692 | deref_member(member); | |
693 | wait_for_completion(&member->comp); | |
694 | ib_sa_client_put(member->client); | |
695 | kfree(member); | |
696 | } | |
697 | EXPORT_SYMBOL(ib_sa_free_multicast); | |
698 | ||
699 | int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num, | |
700 | union ib_gid *mgid, struct ib_sa_mcmember_rec *rec) | |
701 | { | |
702 | struct mcast_device *dev; | |
703 | struct mcast_port *port; | |
704 | struct mcast_group *group; | |
705 | unsigned long flags; | |
706 | int ret = 0; | |
707 | ||
708 | dev = ib_get_client_data(device, &mcast_client); | |
709 | if (!dev) | |
710 | return -ENODEV; | |
711 | ||
712 | port = &dev->port[port_num - dev->start_port]; | |
713 | spin_lock_irqsave(&port->lock, flags); | |
714 | group = mcast_find(port, mgid); | |
715 | if (group) | |
716 | *rec = group->rec; | |
717 | else | |
718 | ret = -EADDRNOTAVAIL; | |
719 | spin_unlock_irqrestore(&port->lock, flags); | |
720 | ||
721 | return ret; | |
722 | } | |
723 | EXPORT_SYMBOL(ib_sa_get_mcmember_rec); | |
724 | ||
725 | int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num, | |
726 | struct ib_sa_mcmember_rec *rec, | |
bee3c3c9 MS |
727 | struct net_device *ndev, |
728 | enum ib_gid_type gid_type, | |
faec2f7b SH |
729 | struct ib_ah_attr *ah_attr) |
730 | { | |
731 | int ret; | |
732 | u16 gid_index; | |
733 | u8 p; | |
734 | ||
bee3c3c9 MS |
735 | if (rdma_protocol_roce(device, port_num)) { |
736 | ret = ib_find_cached_gid_by_port(device, &rec->port_gid, | |
737 | gid_type, port_num, | |
738 | ndev, | |
739 | &gid_index); | |
740 | } else if (rdma_protocol_ib(device, port_num)) { | |
741 | ret = ib_find_cached_gid(device, &rec->port_gid, | |
742 | IB_GID_TYPE_IB, NULL, &p, | |
743 | &gid_index); | |
744 | } else { | |
745 | ret = -EINVAL; | |
746 | } | |
747 | ||
faec2f7b SH |
748 | if (ret) |
749 | return ret; | |
750 | ||
751 | memset(ah_attr, 0, sizeof *ah_attr); | |
752 | ah_attr->dlid = be16_to_cpu(rec->mlid); | |
753 | ah_attr->sl = rec->sl; | |
754 | ah_attr->port_num = port_num; | |
755 | ah_attr->static_rate = rec->rate; | |
756 | ||
757 | ah_attr->ah_flags = IB_AH_GRH; | |
758 | ah_attr->grh.dgid = rec->mgid; | |
759 | ||
760 | ah_attr->grh.sgid_index = (u8) gid_index; | |
761 | ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label); | |
762 | ah_attr->grh.hop_limit = rec->hop_limit; | |
763 | ah_attr->grh.traffic_class = rec->traffic_class; | |
764 | ||
765 | return 0; | |
766 | } | |
767 | EXPORT_SYMBOL(ib_init_ah_from_mcmember); | |
768 | ||
547af765 SH |
769 | static void mcast_groups_event(struct mcast_port *port, |
770 | enum mcast_group_state state) | |
faec2f7b SH |
771 | { |
772 | struct mcast_group *group; | |
773 | struct rb_node *node; | |
774 | unsigned long flags; | |
775 | ||
776 | spin_lock_irqsave(&port->lock, flags); | |
777 | for (node = rb_first(&port->table); node; node = rb_next(node)) { | |
778 | group = rb_entry(node, struct mcast_group, node); | |
779 | spin_lock(&group->lock); | |
780 | if (group->state == MCAST_IDLE) { | |
781 | atomic_inc(&group->refcount); | |
782 | queue_work(mcast_wq, &group->work); | |
783 | } | |
547af765 SH |
784 | if (group->state != MCAST_GROUP_ERROR) |
785 | group->state = state; | |
faec2f7b SH |
786 | spin_unlock(&group->lock); |
787 | } | |
788 | spin_unlock_irqrestore(&port->lock, flags); | |
789 | } | |
790 | ||
791 | static void mcast_event_handler(struct ib_event_handler *handler, | |
792 | struct ib_event *event) | |
793 | { | |
794 | struct mcast_device *dev; | |
547af765 | 795 | int index; |
faec2f7b SH |
796 | |
797 | dev = container_of(handler, struct mcast_device, event_handler); | |
9247a8eb | 798 | if (!rdma_cap_ib_mcast(dev->device, event->element.port_num)) |
fac70d51 EC |
799 | return; |
800 | ||
547af765 | 801 | index = event->element.port_num - dev->start_port; |
faec2f7b SH |
802 | |
803 | switch (event->event) { | |
804 | case IB_EVENT_PORT_ERR: | |
805 | case IB_EVENT_LID_CHANGE: | |
806 | case IB_EVENT_SM_CHANGE: | |
807 | case IB_EVENT_CLIENT_REREGISTER: | |
547af765 SH |
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); | |
faec2f7b SH |
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; | |
fac70d51 | 823 | int count = 0; |
faec2f7b | 824 | |
faec2f7b SH |
825 | dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port, |
826 | GFP_KERNEL); | |
827 | if (!dev) | |
828 | return; | |
829 | ||
4139032b HR |
830 | dev->start_port = rdma_start_port(device); |
831 | dev->end_port = rdma_end_port(device); | |
faec2f7b SH |
832 | |
833 | for (i = 0; i <= dev->end_port - dev->start_port; i++) { | |
a31ad3b0 | 834 | if (!rdma_cap_ib_mcast(device, dev->start_port + i)) |
fac70d51 | 835 | continue; |
faec2f7b SH |
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); | |
fac70d51 EC |
843 | ++count; |
844 | } | |
845 | ||
846 | if (!count) { | |
847 | kfree(dev); | |
848 | return; | |
faec2f7b SH |
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 | ||
7c1eb45a | 858 | static void mcast_remove_one(struct ib_device *device, void *client_data) |
faec2f7b | 859 | { |
7c1eb45a | 860 | struct mcast_device *dev = client_data; |
faec2f7b SH |
861 | struct mcast_port *port; |
862 | int i; | |
863 | ||
faec2f7b SH |
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++) { | |
a31ad3b0 | 871 | if (rdma_cap_ib_mcast(device, dev->start_port + i)) { |
fac70d51 EC |
872 | port = &dev->port[i]; |
873 | deref_port(port); | |
874 | wait_for_completion(&port->comp); | |
875 | } | |
faec2f7b SH |
876 | } |
877 | ||
878 | kfree(dev); | |
879 | } | |
880 | ||
881 | int mcast_init(void) | |
882 | { | |
883 | int ret; | |
884 | ||
885 | mcast_wq = create_singlethread_workqueue("ib_mcast"); | |
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 | } |