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IB/mlx4: Fix QP1 P_Key processing in the Primary Physical Function (PPF)
[deliverable/linux.git] / drivers / infiniband / hw / mlx4 / mcg.c
1 /*
2 * Copyright (c) 2012 Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <rdma/ib_mad.h>
34 #include <rdma/ib_smi.h>
35 #include <rdma/ib_cache.h>
36 #include <rdma/ib_sa.h>
37
38 #include <linux/mlx4/cmd.h>
39 #include <linux/rbtree.h>
40 #include <linux/delay.h>
41
42 #include "mlx4_ib.h"
43
44 #define MAX_VFS 80
45 #define MAX_PEND_REQS_PER_FUNC 4
46 #define MAD_TIMEOUT_MS 2000
47
48 #define mcg_warn(fmt, arg...) pr_warn("MCG WARNING: " fmt, ##arg)
49 #define mcg_error(fmt, arg...) pr_err(fmt, ##arg)
50 #define mcg_warn_group(group, format, arg...) \
51 pr_warn("%s-%d: %16s (port %d): WARNING: " format, __func__, __LINE__,\
52 (group)->name, group->demux->port, ## arg)
53
54 #define mcg_error_group(group, format, arg...) \
55 pr_err(" %16s: " format, (group)->name, ## arg)
56
57
58 static union ib_gid mgid0;
59
60 static struct workqueue_struct *clean_wq;
61
62 enum mcast_state {
63 MCAST_NOT_MEMBER = 0,
64 MCAST_MEMBER,
65 };
66
67 enum mcast_group_state {
68 MCAST_IDLE,
69 MCAST_JOIN_SENT,
70 MCAST_LEAVE_SENT,
71 MCAST_RESP_READY
72 };
73
74 struct mcast_member {
75 enum mcast_state state;
76 uint8_t join_state;
77 int num_pend_reqs;
78 struct list_head pending;
79 };
80
81 struct ib_sa_mcmember_data {
82 union ib_gid mgid;
83 union ib_gid port_gid;
84 __be32 qkey;
85 __be16 mlid;
86 u8 mtusel_mtu;
87 u8 tclass;
88 __be16 pkey;
89 u8 ratesel_rate;
90 u8 lifetmsel_lifetm;
91 __be32 sl_flowlabel_hoplimit;
92 u8 scope_join_state;
93 u8 proxy_join;
94 u8 reserved[2];
95 };
96
97 struct mcast_group {
98 struct ib_sa_mcmember_data rec;
99 struct rb_node node;
100 struct list_head mgid0_list;
101 struct mlx4_ib_demux_ctx *demux;
102 struct mcast_member func[MAX_VFS];
103 struct mutex lock;
104 struct work_struct work;
105 struct list_head pending_list;
106 int members[3];
107 enum mcast_group_state state;
108 enum mcast_group_state prev_state;
109 struct ib_sa_mad response_sa_mad;
110 __be64 last_req_tid;
111
112 char name[33]; /* MGID string */
113 struct device_attribute dentry;
114
115 /* refcount is the reference count for the following:
116 1. Each queued request
117 2. Each invocation of the worker thread
118 3. Membership of the port at the SA
119 */
120 atomic_t refcount;
121
122 /* delayed work to clean pending SM request */
123 struct delayed_work timeout_work;
124 struct list_head cleanup_list;
125 };
126
127 struct mcast_req {
128 int func;
129 struct ib_sa_mad sa_mad;
130 struct list_head group_list;
131 struct list_head func_list;
132 struct mcast_group *group;
133 int clean;
134 };
135
136
137 #define safe_atomic_dec(ref) \
138 do {\
139 if (atomic_dec_and_test(ref)) \
140 mcg_warn_group(group, "did not expect to reach zero\n"); \
141 } while (0)
142
143 static const char *get_state_string(enum mcast_group_state state)
144 {
145 switch (state) {
146 case MCAST_IDLE:
147 return "MCAST_IDLE";
148 case MCAST_JOIN_SENT:
149 return "MCAST_JOIN_SENT";
150 case MCAST_LEAVE_SENT:
151 return "MCAST_LEAVE_SENT";
152 case MCAST_RESP_READY:
153 return "MCAST_RESP_READY";
154 }
155 return "Invalid State";
156 }
157
158 static struct mcast_group *mcast_find(struct mlx4_ib_demux_ctx *ctx,
159 union ib_gid *mgid)
160 {
161 struct rb_node *node = ctx->mcg_table.rb_node;
162 struct mcast_group *group;
163 int ret;
164
165 while (node) {
166 group = rb_entry(node, struct mcast_group, node);
167 ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid);
168 if (!ret)
169 return group;
170
171 if (ret < 0)
172 node = node->rb_left;
173 else
174 node = node->rb_right;
175 }
176 return NULL;
177 }
178
179 static struct mcast_group *mcast_insert(struct mlx4_ib_demux_ctx *ctx,
180 struct mcast_group *group)
181 {
182 struct rb_node **link = &ctx->mcg_table.rb_node;
183 struct rb_node *parent = NULL;
184 struct mcast_group *cur_group;
185 int ret;
186
187 while (*link) {
188 parent = *link;
189 cur_group = rb_entry(parent, struct mcast_group, node);
190
191 ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw,
192 sizeof group->rec.mgid);
193 if (ret < 0)
194 link = &(*link)->rb_left;
195 else if (ret > 0)
196 link = &(*link)->rb_right;
197 else
198 return cur_group;
199 }
200 rb_link_node(&group->node, parent, link);
201 rb_insert_color(&group->node, &ctx->mcg_table);
202 return NULL;
203 }
204
205 static int send_mad_to_wire(struct mlx4_ib_demux_ctx *ctx, struct ib_mad *mad)
206 {
207 struct mlx4_ib_dev *dev = ctx->dev;
208 struct ib_ah_attr ah_attr;
209
210 spin_lock(&dev->sm_lock);
211 if (!dev->sm_ah[ctx->port - 1]) {
212 /* port is not yet Active, sm_ah not ready */
213 spin_unlock(&dev->sm_lock);
214 return -EAGAIN;
215 }
216 mlx4_ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr);
217 spin_unlock(&dev->sm_lock);
218 return mlx4_ib_send_to_wire(dev, mlx4_master_func_num(dev->dev), ctx->port,
219 IB_QPT_GSI, 0, 1, IB_QP1_QKEY, &ah_attr, mad);
220 }
221
222 static int send_mad_to_slave(int slave, struct mlx4_ib_demux_ctx *ctx,
223 struct ib_mad *mad)
224 {
225 struct mlx4_ib_dev *dev = ctx->dev;
226 struct ib_mad_agent *agent = dev->send_agent[ctx->port - 1][1];
227 struct ib_wc wc;
228 struct ib_ah_attr ah_attr;
229
230 /* Our agent might not yet be registered when mads start to arrive */
231 if (!agent)
232 return -EAGAIN;
233
234 ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr);
235
236 if (ib_find_cached_pkey(&dev->ib_dev, ctx->port, IB_DEFAULT_PKEY_FULL, &wc.pkey_index))
237 return -EINVAL;
238 wc.sl = 0;
239 wc.dlid_path_bits = 0;
240 wc.port_num = ctx->port;
241 wc.slid = ah_attr.dlid; /* opensm lid */
242 wc.src_qp = 1;
243 return mlx4_ib_send_to_slave(dev, slave, ctx->port, IB_QPT_GSI, &wc, NULL, mad);
244 }
245
246 static int send_join_to_wire(struct mcast_group *group, struct ib_sa_mad *sa_mad)
247 {
248 struct ib_sa_mad mad;
249 struct ib_sa_mcmember_data *sa_mad_data = (struct ib_sa_mcmember_data *)&mad.data;
250 int ret;
251
252 /* we rely on a mad request as arrived from a VF */
253 memcpy(&mad, sa_mad, sizeof mad);
254
255 /* fix port GID to be the real one (slave 0) */
256 sa_mad_data->port_gid.global.interface_id = group->demux->guid_cache[0];
257
258 /* assign our own TID */
259 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux);
260 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */
261
262 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad);
263 /* set timeout handler */
264 if (!ret) {
265 /* calls mlx4_ib_mcg_timeout_handler */
266 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work,
267 msecs_to_jiffies(MAD_TIMEOUT_MS));
268 }
269
270 return ret;
271 }
272
273 static int send_leave_to_wire(struct mcast_group *group, u8 join_state)
274 {
275 struct ib_sa_mad mad;
276 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data;
277 int ret;
278
279 memset(&mad, 0, sizeof mad);
280 mad.mad_hdr.base_version = 1;
281 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
282 mad.mad_hdr.class_version = 2;
283 mad.mad_hdr.method = IB_SA_METHOD_DELETE;
284 mad.mad_hdr.status = cpu_to_be16(0);
285 mad.mad_hdr.class_specific = cpu_to_be16(0);
286 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux);
287 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */
288 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
289 mad.mad_hdr.attr_mod = cpu_to_be32(0);
290 mad.sa_hdr.sm_key = 0x0;
291 mad.sa_hdr.attr_offset = cpu_to_be16(7);
292 mad.sa_hdr.comp_mask = IB_SA_MCMEMBER_REC_MGID |
293 IB_SA_MCMEMBER_REC_PORT_GID | IB_SA_MCMEMBER_REC_JOIN_STATE;
294
295 *sa_data = group->rec;
296 sa_data->scope_join_state = join_state;
297
298 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad);
299 if (ret)
300 group->state = MCAST_IDLE;
301
302 /* set timeout handler */
303 if (!ret) {
304 /* calls mlx4_ib_mcg_timeout_handler */
305 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work,
306 msecs_to_jiffies(MAD_TIMEOUT_MS));
307 }
308
309 return ret;
310 }
311
312 static int send_reply_to_slave(int slave, struct mcast_group *group,
313 struct ib_sa_mad *req_sa_mad, u16 status)
314 {
315 struct ib_sa_mad mad;
316 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data;
317 struct ib_sa_mcmember_data *req_sa_data = (struct ib_sa_mcmember_data *)&req_sa_mad->data;
318 int ret;
319
320 memset(&mad, 0, sizeof mad);
321 mad.mad_hdr.base_version = 1;
322 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
323 mad.mad_hdr.class_version = 2;
324 mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
325 mad.mad_hdr.status = cpu_to_be16(status);
326 mad.mad_hdr.class_specific = cpu_to_be16(0);
327 mad.mad_hdr.tid = req_sa_mad->mad_hdr.tid;
328 *(u8 *)&mad.mad_hdr.tid = 0; /* resetting tid to 0 */
329 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
330 mad.mad_hdr.attr_mod = cpu_to_be32(0);
331 mad.sa_hdr.sm_key = req_sa_mad->sa_hdr.sm_key;
332 mad.sa_hdr.attr_offset = cpu_to_be16(7);
333 mad.sa_hdr.comp_mask = 0; /* ignored on responses, see IBTA spec */
334
335 *sa_data = group->rec;
336
337 /* reconstruct VF's requested join_state and port_gid */
338 sa_data->scope_join_state &= 0xf0;
339 sa_data->scope_join_state |= (group->func[slave].join_state & 0x0f);
340 memcpy(&sa_data->port_gid, &req_sa_data->port_gid, sizeof req_sa_data->port_gid);
341
342 ret = send_mad_to_slave(slave, group->demux, (struct ib_mad *)&mad);
343 return ret;
344 }
345
346 static int check_selector(ib_sa_comp_mask comp_mask,
347 ib_sa_comp_mask selector_mask,
348 ib_sa_comp_mask value_mask,
349 u8 src_value, u8 dst_value)
350 {
351 int err;
352 u8 selector = dst_value >> 6;
353 dst_value &= 0x3f;
354 src_value &= 0x3f;
355
356 if (!(comp_mask & selector_mask) || !(comp_mask & value_mask))
357 return 0;
358
359 switch (selector) {
360 case IB_SA_GT:
361 err = (src_value <= dst_value);
362 break;
363 case IB_SA_LT:
364 err = (src_value >= dst_value);
365 break;
366 case IB_SA_EQ:
367 err = (src_value != dst_value);
368 break;
369 default:
370 err = 0;
371 break;
372 }
373
374 return err;
375 }
376
377 static u16 cmp_rec(struct ib_sa_mcmember_data *src,
378 struct ib_sa_mcmember_data *dst, ib_sa_comp_mask comp_mask)
379 {
380 /* src is group record, dst is request record */
381 /* MGID must already match */
382 /* Port_GID we always replace to our Port_GID, so it is a match */
383
384 #define MAD_STATUS_REQ_INVALID 0x0200
385 if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey)
386 return MAD_STATUS_REQ_INVALID;
387 if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid)
388 return MAD_STATUS_REQ_INVALID;
389 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR,
390 IB_SA_MCMEMBER_REC_MTU,
391 src->mtusel_mtu, dst->mtusel_mtu))
392 return MAD_STATUS_REQ_INVALID;
393 if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS &&
394 src->tclass != dst->tclass)
395 return MAD_STATUS_REQ_INVALID;
396 if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey)
397 return MAD_STATUS_REQ_INVALID;
398 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR,
399 IB_SA_MCMEMBER_REC_RATE,
400 src->ratesel_rate, dst->ratesel_rate))
401 return MAD_STATUS_REQ_INVALID;
402 if (check_selector(comp_mask,
403 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR,
404 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME,
405 src->lifetmsel_lifetm, dst->lifetmsel_lifetm))
406 return MAD_STATUS_REQ_INVALID;
407 if (comp_mask & IB_SA_MCMEMBER_REC_SL &&
408 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0xf0000000) !=
409 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0xf0000000))
410 return MAD_STATUS_REQ_INVALID;
411 if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL &&
412 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x0fffff00) !=
413 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x0fffff00))
414 return MAD_STATUS_REQ_INVALID;
415 if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT &&
416 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x000000ff) !=
417 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x000000ff))
418 return MAD_STATUS_REQ_INVALID;
419 if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE &&
420 (src->scope_join_state & 0xf0) !=
421 (dst->scope_join_state & 0xf0))
422 return MAD_STATUS_REQ_INVALID;
423
424 /* join_state checked separately, proxy_join ignored */
425
426 return 0;
427 }
428
429 /* release group, return 1 if this was last release and group is destroyed
430 * timout work is canceled sync */
431 static int release_group(struct mcast_group *group, int from_timeout_handler)
432 {
433 struct mlx4_ib_demux_ctx *ctx = group->demux;
434 int nzgroup;
435
436 mutex_lock(&ctx->mcg_table_lock);
437 mutex_lock(&group->lock);
438 if (atomic_dec_and_test(&group->refcount)) {
439 if (!from_timeout_handler) {
440 if (group->state != MCAST_IDLE &&
441 !cancel_delayed_work(&group->timeout_work)) {
442 atomic_inc(&group->refcount);
443 mutex_unlock(&group->lock);
444 mutex_unlock(&ctx->mcg_table_lock);
445 return 0;
446 }
447 }
448
449 nzgroup = memcmp(&group->rec.mgid, &mgid0, sizeof mgid0);
450 if (nzgroup)
451 del_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
452 if (!list_empty(&group->pending_list))
453 mcg_warn_group(group, "releasing a group with non empty pending list\n");
454 if (nzgroup)
455 rb_erase(&group->node, &ctx->mcg_table);
456 list_del_init(&group->mgid0_list);
457 mutex_unlock(&group->lock);
458 mutex_unlock(&ctx->mcg_table_lock);
459 kfree(group);
460 return 1;
461 } else {
462 mutex_unlock(&group->lock);
463 mutex_unlock(&ctx->mcg_table_lock);
464 }
465 return 0;
466 }
467
468 static void adjust_membership(struct mcast_group *group, u8 join_state, int inc)
469 {
470 int i;
471
472 for (i = 0; i < 3; i++, join_state >>= 1)
473 if (join_state & 0x1)
474 group->members[i] += inc;
475 }
476
477 static u8 get_leave_state(struct mcast_group *group)
478 {
479 u8 leave_state = 0;
480 int i;
481
482 for (i = 0; i < 3; i++)
483 if (!group->members[i])
484 leave_state |= (1 << i);
485
486 return leave_state & (group->rec.scope_join_state & 7);
487 }
488
489 static int join_group(struct mcast_group *group, int slave, u8 join_mask)
490 {
491 int ret = 0;
492 u8 join_state;
493
494 /* remove bits that slave is already member of, and adjust */
495 join_state = join_mask & (~group->func[slave].join_state);
496 adjust_membership(group, join_state, 1);
497 group->func[slave].join_state |= join_state;
498 if (group->func[slave].state != MCAST_MEMBER && join_state) {
499 group->func[slave].state = MCAST_MEMBER;
500 ret = 1;
501 }
502 return ret;
503 }
504
505 static int leave_group(struct mcast_group *group, int slave, u8 leave_state)
506 {
507 int ret = 0;
508
509 adjust_membership(group, leave_state, -1);
510 group->func[slave].join_state &= ~leave_state;
511 if (!group->func[slave].join_state) {
512 group->func[slave].state = MCAST_NOT_MEMBER;
513 ret = 1;
514 }
515 return ret;
516 }
517
518 static int check_leave(struct mcast_group *group, int slave, u8 leave_mask)
519 {
520 if (group->func[slave].state != MCAST_MEMBER)
521 return MAD_STATUS_REQ_INVALID;
522
523 /* make sure we're not deleting unset bits */
524 if (~group->func[slave].join_state & leave_mask)
525 return MAD_STATUS_REQ_INVALID;
526
527 if (!leave_mask)
528 return MAD_STATUS_REQ_INVALID;
529
530 return 0;
531 }
532
533 static void mlx4_ib_mcg_timeout_handler(struct work_struct *work)
534 {
535 struct delayed_work *delay = to_delayed_work(work);
536 struct mcast_group *group;
537 struct mcast_req *req = NULL;
538
539 group = container_of(delay, typeof(*group), timeout_work);
540
541 mutex_lock(&group->lock);
542 if (group->state == MCAST_JOIN_SENT) {
543 if (!list_empty(&group->pending_list)) {
544 req = list_first_entry(&group->pending_list, struct mcast_req, group_list);
545 list_del(&req->group_list);
546 list_del(&req->func_list);
547 --group->func[req->func].num_pend_reqs;
548 mutex_unlock(&group->lock);
549 kfree(req);
550 if (memcmp(&group->rec.mgid, &mgid0, sizeof mgid0)) {
551 if (release_group(group, 1))
552 return;
553 } else {
554 kfree(group);
555 return;
556 }
557 mutex_lock(&group->lock);
558 } else
559 mcg_warn_group(group, "DRIVER BUG\n");
560 } else if (group->state == MCAST_LEAVE_SENT) {
561 if (group->rec.scope_join_state & 7)
562 group->rec.scope_join_state &= 0xf8;
563 group->state = MCAST_IDLE;
564 mutex_unlock(&group->lock);
565 if (release_group(group, 1))
566 return;
567 mutex_lock(&group->lock);
568 } else
569 mcg_warn_group(group, "invalid state %s\n", get_state_string(group->state));
570 group->state = MCAST_IDLE;
571 atomic_inc(&group->refcount);
572 if (!queue_work(group->demux->mcg_wq, &group->work))
573 safe_atomic_dec(&group->refcount);
574
575 mutex_unlock(&group->lock);
576 }
577
578 static int handle_leave_req(struct mcast_group *group, u8 leave_mask,
579 struct mcast_req *req)
580 {
581 u16 status;
582
583 if (req->clean)
584 leave_mask = group->func[req->func].join_state;
585
586 status = check_leave(group, req->func, leave_mask);
587 if (!status)
588 leave_group(group, req->func, leave_mask);
589
590 if (!req->clean)
591 send_reply_to_slave(req->func, group, &req->sa_mad, status);
592 --group->func[req->func].num_pend_reqs;
593 list_del(&req->group_list);
594 list_del(&req->func_list);
595 kfree(req);
596 return 1;
597 }
598
599 static int handle_join_req(struct mcast_group *group, u8 join_mask,
600 struct mcast_req *req)
601 {
602 u8 group_join_state = group->rec.scope_join_state & 7;
603 int ref = 0;
604 u16 status;
605 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data;
606
607 if (join_mask == (group_join_state & join_mask)) {
608 /* port's membership need not change */
609 status = cmp_rec(&group->rec, sa_data, req->sa_mad.sa_hdr.comp_mask);
610 if (!status)
611 join_group(group, req->func, join_mask);
612
613 --group->func[req->func].num_pend_reqs;
614 send_reply_to_slave(req->func, group, &req->sa_mad, status);
615 list_del(&req->group_list);
616 list_del(&req->func_list);
617 kfree(req);
618 ++ref;
619 } else {
620 /* port's membership needs to be updated */
621 group->prev_state = group->state;
622 if (send_join_to_wire(group, &req->sa_mad)) {
623 --group->func[req->func].num_pend_reqs;
624 list_del(&req->group_list);
625 list_del(&req->func_list);
626 kfree(req);
627 ref = 1;
628 group->state = group->prev_state;
629 } else
630 group->state = MCAST_JOIN_SENT;
631 }
632
633 return ref;
634 }
635
636 static void mlx4_ib_mcg_work_handler(struct work_struct *work)
637 {
638 struct mcast_group *group;
639 struct mcast_req *req = NULL;
640 struct ib_sa_mcmember_data *sa_data;
641 u8 req_join_state;
642 int rc = 1; /* release_count - this is for the scheduled work */
643 u16 status;
644 u8 method;
645
646 group = container_of(work, typeof(*group), work);
647
648 mutex_lock(&group->lock);
649
650 /* First, let's see if a response from SM is waiting regarding this group.
651 * If so, we need to update the group's REC. If this is a bad response, we
652 * may need to send a bad response to a VF waiting for it. If VF is waiting
653 * and this is a good response, the VF will be answered later in this func. */
654 if (group->state == MCAST_RESP_READY) {
655 /* cancels mlx4_ib_mcg_timeout_handler */
656 cancel_delayed_work(&group->timeout_work);
657 status = be16_to_cpu(group->response_sa_mad.mad_hdr.status);
658 method = group->response_sa_mad.mad_hdr.method;
659 if (group->last_req_tid != group->response_sa_mad.mad_hdr.tid) {
660 mcg_warn_group(group, "Got MAD response to existing MGID but wrong TID, dropping. Resp TID=%llx, group TID=%llx\n",
661 be64_to_cpu(group->response_sa_mad.mad_hdr.tid),
662 be64_to_cpu(group->last_req_tid));
663 group->state = group->prev_state;
664 goto process_requests;
665 }
666 if (status) {
667 if (!list_empty(&group->pending_list))
668 req = list_first_entry(&group->pending_list,
669 struct mcast_req, group_list);
670 if ((method == IB_MGMT_METHOD_GET_RESP)) {
671 if (req) {
672 send_reply_to_slave(req->func, group, &req->sa_mad, status);
673 --group->func[req->func].num_pend_reqs;
674 list_del(&req->group_list);
675 list_del(&req->func_list);
676 kfree(req);
677 ++rc;
678 } else
679 mcg_warn_group(group, "no request for failed join\n");
680 } else if (method == IB_SA_METHOD_DELETE_RESP && group->demux->flushing)
681 ++rc;
682 } else {
683 u8 resp_join_state;
684 u8 cur_join_state;
685
686 resp_join_state = ((struct ib_sa_mcmember_data *)
687 group->response_sa_mad.data)->scope_join_state & 7;
688 cur_join_state = group->rec.scope_join_state & 7;
689
690 if (method == IB_MGMT_METHOD_GET_RESP) {
691 /* successfull join */
692 if (!cur_join_state && resp_join_state)
693 --rc;
694 } else if (!resp_join_state)
695 ++rc;
696 memcpy(&group->rec, group->response_sa_mad.data, sizeof group->rec);
697 }
698 group->state = MCAST_IDLE;
699 }
700
701 process_requests:
702 /* We should now go over pending join/leave requests, as long as we are idle. */
703 while (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) {
704 req = list_first_entry(&group->pending_list, struct mcast_req,
705 group_list);
706 sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data;
707 req_join_state = sa_data->scope_join_state & 0x7;
708
709 /* For a leave request, we will immediately answer the VF, and
710 * update our internal counters. The actual leave will be sent
711 * to SM later, if at all needed. We dequeue the request now. */
712 if (req->sa_mad.mad_hdr.method == IB_SA_METHOD_DELETE)
713 rc += handle_leave_req(group, req_join_state, req);
714 else
715 rc += handle_join_req(group, req_join_state, req);
716 }
717
718 /* Handle leaves */
719 if (group->state == MCAST_IDLE) {
720 req_join_state = get_leave_state(group);
721 if (req_join_state) {
722 group->rec.scope_join_state &= ~req_join_state;
723 group->prev_state = group->state;
724 if (send_leave_to_wire(group, req_join_state)) {
725 group->state = group->prev_state;
726 ++rc;
727 } else
728 group->state = MCAST_LEAVE_SENT;
729 }
730 }
731
732 if (!list_empty(&group->pending_list) && group->state == MCAST_IDLE)
733 goto process_requests;
734 mutex_unlock(&group->lock);
735
736 while (rc--)
737 release_group(group, 0);
738 }
739
740 static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx *ctx,
741 __be64 tid,
742 union ib_gid *new_mgid)
743 {
744 struct mcast_group *group = NULL, *cur_group;
745 struct mcast_req *req;
746 struct list_head *pos;
747 struct list_head *n;
748
749 mutex_lock(&ctx->mcg_table_lock);
750 list_for_each_safe(pos, n, &ctx->mcg_mgid0_list) {
751 group = list_entry(pos, struct mcast_group, mgid0_list);
752 mutex_lock(&group->lock);
753 if (group->last_req_tid == tid) {
754 if (memcmp(new_mgid, &mgid0, sizeof mgid0)) {
755 group->rec.mgid = *new_mgid;
756 sprintf(group->name, "%016llx%016llx",
757 be64_to_cpu(group->rec.mgid.global.subnet_prefix),
758 be64_to_cpu(group->rec.mgid.global.interface_id));
759 list_del_init(&group->mgid0_list);
760 cur_group = mcast_insert(ctx, group);
761 if (cur_group) {
762 /* A race between our code and SM. Silently cleaning the new one */
763 req = list_first_entry(&group->pending_list,
764 struct mcast_req, group_list);
765 --group->func[req->func].num_pend_reqs;
766 list_del(&req->group_list);
767 list_del(&req->func_list);
768 kfree(req);
769 mutex_unlock(&group->lock);
770 mutex_unlock(&ctx->mcg_table_lock);
771 release_group(group, 0);
772 return NULL;
773 }
774
775 atomic_inc(&group->refcount);
776 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
777 mutex_unlock(&group->lock);
778 mutex_unlock(&ctx->mcg_table_lock);
779 return group;
780 } else {
781 struct mcast_req *tmp1, *tmp2;
782
783 list_del(&group->mgid0_list);
784 if (!list_empty(&group->pending_list) && group->state != MCAST_IDLE)
785 cancel_delayed_work_sync(&group->timeout_work);
786
787 list_for_each_entry_safe(tmp1, tmp2, &group->pending_list, group_list) {
788 list_del(&tmp1->group_list);
789 kfree(tmp1);
790 }
791 mutex_unlock(&group->lock);
792 mutex_unlock(&ctx->mcg_table_lock);
793 kfree(group);
794 return NULL;
795 }
796 }
797 mutex_unlock(&group->lock);
798 }
799 mutex_unlock(&ctx->mcg_table_lock);
800
801 return NULL;
802 }
803
804 static ssize_t sysfs_show_group(struct device *dev,
805 struct device_attribute *attr, char *buf);
806
807 static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx,
808 union ib_gid *mgid, int create,
809 gfp_t gfp_mask)
810 {
811 struct mcast_group *group, *cur_group;
812 int is_mgid0;
813 int i;
814
815 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
816 if (!is_mgid0) {
817 group = mcast_find(ctx, mgid);
818 if (group)
819 goto found;
820 }
821
822 if (!create)
823 return ERR_PTR(-ENOENT);
824
825 group = kzalloc(sizeof *group, gfp_mask);
826 if (!group)
827 return ERR_PTR(-ENOMEM);
828
829 group->demux = ctx;
830 group->rec.mgid = *mgid;
831 INIT_LIST_HEAD(&group->pending_list);
832 INIT_LIST_HEAD(&group->mgid0_list);
833 for (i = 0; i < MAX_VFS; ++i)
834 INIT_LIST_HEAD(&group->func[i].pending);
835 INIT_WORK(&group->work, mlx4_ib_mcg_work_handler);
836 INIT_DELAYED_WORK(&group->timeout_work, mlx4_ib_mcg_timeout_handler);
837 mutex_init(&group->lock);
838 sprintf(group->name, "%016llx%016llx",
839 be64_to_cpu(group->rec.mgid.global.subnet_prefix),
840 be64_to_cpu(group->rec.mgid.global.interface_id));
841 sysfs_attr_init(&group->dentry.attr);
842 group->dentry.show = sysfs_show_group;
843 group->dentry.store = NULL;
844 group->dentry.attr.name = group->name;
845 group->dentry.attr.mode = 0400;
846 group->state = MCAST_IDLE;
847
848 if (is_mgid0) {
849 list_add(&group->mgid0_list, &ctx->mcg_mgid0_list);
850 goto found;
851 }
852
853 cur_group = mcast_insert(ctx, group);
854 if (cur_group) {
855 mcg_warn("group just showed up %s - confused\n", cur_group->name);
856 kfree(group);
857 return ERR_PTR(-EINVAL);
858 }
859
860 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
861
862 found:
863 atomic_inc(&group->refcount);
864 return group;
865 }
866
867 static void queue_req(struct mcast_req *req)
868 {
869 struct mcast_group *group = req->group;
870
871 atomic_inc(&group->refcount); /* for the request */
872 atomic_inc(&group->refcount); /* for scheduling the work */
873 list_add_tail(&req->group_list, &group->pending_list);
874 list_add_tail(&req->func_list, &group->func[req->func].pending);
875 /* calls mlx4_ib_mcg_work_handler */
876 if (!queue_work(group->demux->mcg_wq, &group->work))
877 safe_atomic_dec(&group->refcount);
878 }
879
880 int mlx4_ib_mcg_demux_handler(struct ib_device *ibdev, int port, int slave,
881 struct ib_sa_mad *mad)
882 {
883 struct mlx4_ib_dev *dev = to_mdev(ibdev);
884 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)mad->data;
885 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1];
886 struct mcast_group *group;
887
888 switch (mad->mad_hdr.method) {
889 case IB_MGMT_METHOD_GET_RESP:
890 case IB_SA_METHOD_DELETE_RESP:
891 mutex_lock(&ctx->mcg_table_lock);
892 group = acquire_group(ctx, &rec->mgid, 0, GFP_KERNEL);
893 mutex_unlock(&ctx->mcg_table_lock);
894 if (IS_ERR(group)) {
895 if (mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP) {
896 __be64 tid = mad->mad_hdr.tid;
897 *(u8 *)(&tid) = (u8)slave; /* in group we kept the modified TID */
898 group = search_relocate_mgid0_group(ctx, tid, &rec->mgid);
899 } else
900 group = NULL;
901 }
902
903 if (!group)
904 return 1;
905
906 mutex_lock(&group->lock);
907 group->response_sa_mad = *mad;
908 group->prev_state = group->state;
909 group->state = MCAST_RESP_READY;
910 /* calls mlx4_ib_mcg_work_handler */
911 atomic_inc(&group->refcount);
912 if (!queue_work(ctx->mcg_wq, &group->work))
913 safe_atomic_dec(&group->refcount);
914 mutex_unlock(&group->lock);
915 release_group(group, 0);
916 return 1; /* consumed */
917 case IB_MGMT_METHOD_SET:
918 case IB_SA_METHOD_GET_TABLE:
919 case IB_SA_METHOD_GET_TABLE_RESP:
920 case IB_SA_METHOD_DELETE:
921 return 0; /* not consumed, pass-through to guest over tunnel */
922 default:
923 mcg_warn("In demux, port %d: unexpected MCMember method: 0x%x, dropping\n",
924 port, mad->mad_hdr.method);
925 return 1; /* consumed */
926 }
927 }
928
929 int mlx4_ib_mcg_multiplex_handler(struct ib_device *ibdev, int port,
930 int slave, struct ib_sa_mad *sa_mad)
931 {
932 struct mlx4_ib_dev *dev = to_mdev(ibdev);
933 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)sa_mad->data;
934 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1];
935 struct mcast_group *group;
936 struct mcast_req *req;
937 int may_create = 0;
938
939 if (ctx->flushing)
940 return -EAGAIN;
941
942 switch (sa_mad->mad_hdr.method) {
943 case IB_MGMT_METHOD_SET:
944 may_create = 1;
945 case IB_SA_METHOD_DELETE:
946 req = kzalloc(sizeof *req, GFP_KERNEL);
947 if (!req)
948 return -ENOMEM;
949
950 req->func = slave;
951 req->sa_mad = *sa_mad;
952
953 mutex_lock(&ctx->mcg_table_lock);
954 group = acquire_group(ctx, &rec->mgid, may_create, GFP_KERNEL);
955 mutex_unlock(&ctx->mcg_table_lock);
956 if (IS_ERR(group)) {
957 kfree(req);
958 return PTR_ERR(group);
959 }
960 mutex_lock(&group->lock);
961 if (group->func[slave].num_pend_reqs > MAX_PEND_REQS_PER_FUNC) {
962 mutex_unlock(&group->lock);
963 mcg_warn_group(group, "Port %d, Func %d has too many pending requests (%d), dropping\n",
964 port, slave, MAX_PEND_REQS_PER_FUNC);
965 release_group(group, 0);
966 kfree(req);
967 return -ENOMEM;
968 }
969 ++group->func[slave].num_pend_reqs;
970 req->group = group;
971 queue_req(req);
972 mutex_unlock(&group->lock);
973 release_group(group, 0);
974 return 1; /* consumed */
975 case IB_SA_METHOD_GET_TABLE:
976 case IB_MGMT_METHOD_GET_RESP:
977 case IB_SA_METHOD_GET_TABLE_RESP:
978 case IB_SA_METHOD_DELETE_RESP:
979 return 0; /* not consumed, pass-through */
980 default:
981 mcg_warn("In multiplex, port %d, func %d: unexpected MCMember method: 0x%x, dropping\n",
982 port, slave, sa_mad->mad_hdr.method);
983 return 1; /* consumed */
984 }
985 }
986
987 static ssize_t sysfs_show_group(struct device *dev,
988 struct device_attribute *attr, char *buf)
989 {
990 struct mcast_group *group =
991 container_of(attr, struct mcast_group, dentry);
992 struct mcast_req *req = NULL;
993 char pending_str[40];
994 char state_str[40];
995 ssize_t len = 0;
996 int f;
997
998 if (group->state == MCAST_IDLE)
999 sprintf(state_str, "%s", get_state_string(group->state));
1000 else
1001 sprintf(state_str, "%s(TID=0x%llx)",
1002 get_state_string(group->state),
1003 be64_to_cpu(group->last_req_tid));
1004 if (list_empty(&group->pending_list)) {
1005 sprintf(pending_str, "No");
1006 } else {
1007 req = list_first_entry(&group->pending_list, struct mcast_req, group_list);
1008 sprintf(pending_str, "Yes(TID=0x%llx)",
1009 be64_to_cpu(req->sa_mad.mad_hdr.tid));
1010 }
1011 len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s ",
1012 group->rec.scope_join_state & 0xf,
1013 group->members[2], group->members[1], group->members[0],
1014 atomic_read(&group->refcount),
1015 pending_str,
1016 state_str);
1017 for (f = 0; f < MAX_VFS; ++f)
1018 if (group->func[f].state == MCAST_MEMBER)
1019 len += sprintf(buf + len, "%d[%1x] ",
1020 f, group->func[f].join_state);
1021
1022 len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x "
1023 "%4x %4x %2x %2x)\n",
1024 be16_to_cpu(group->rec.pkey),
1025 be32_to_cpu(group->rec.qkey),
1026 (group->rec.mtusel_mtu & 0xc0) >> 6,
1027 group->rec.mtusel_mtu & 0x3f,
1028 group->rec.tclass,
1029 (group->rec.ratesel_rate & 0xc0) >> 6,
1030 group->rec.ratesel_rate & 0x3f,
1031 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28,
1032 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8,
1033 be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff,
1034 group->rec.proxy_join);
1035
1036 return len;
1037 }
1038
1039 int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx)
1040 {
1041 char name[20];
1042
1043 atomic_set(&ctx->tid, 0);
1044 sprintf(name, "mlx4_ib_mcg%d", ctx->port);
1045 ctx->mcg_wq = create_singlethread_workqueue(name);
1046 if (!ctx->mcg_wq)
1047 return -ENOMEM;
1048
1049 mutex_init(&ctx->mcg_table_lock);
1050 ctx->mcg_table = RB_ROOT;
1051 INIT_LIST_HEAD(&ctx->mcg_mgid0_list);
1052 ctx->flushing = 0;
1053
1054 return 0;
1055 }
1056
1057 static void force_clean_group(struct mcast_group *group)
1058 {
1059 struct mcast_req *req, *tmp
1060 ;
1061 list_for_each_entry_safe(req, tmp, &group->pending_list, group_list) {
1062 list_del(&req->group_list);
1063 kfree(req);
1064 }
1065 del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr);
1066 rb_erase(&group->node, &group->demux->mcg_table);
1067 kfree(group);
1068 }
1069
1070 static void _mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq)
1071 {
1072 int i;
1073 struct rb_node *p;
1074 struct mcast_group *group;
1075 unsigned long end;
1076 int count;
1077
1078 if (ctx->flushing)
1079 return;
1080
1081 ctx->flushing = 1;
1082 for (i = 0; i < MAX_VFS; ++i)
1083 clean_vf_mcast(ctx, i);
1084
1085 end = jiffies + msecs_to_jiffies(MAD_TIMEOUT_MS + 3000);
1086 do {
1087 count = 0;
1088 mutex_lock(&ctx->mcg_table_lock);
1089 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p))
1090 ++count;
1091 mutex_unlock(&ctx->mcg_table_lock);
1092 if (!count)
1093 break;
1094
1095 msleep(1);
1096 } while (time_after(end, jiffies));
1097
1098 flush_workqueue(ctx->mcg_wq);
1099 if (destroy_wq)
1100 destroy_workqueue(ctx->mcg_wq);
1101
1102 mutex_lock(&ctx->mcg_table_lock);
1103 while ((p = rb_first(&ctx->mcg_table)) != NULL) {
1104 group = rb_entry(p, struct mcast_group, node);
1105 if (atomic_read(&group->refcount))
1106 mcg_warn_group(group, "group refcount %d!!! (pointer %p)\n", atomic_read(&group->refcount), group);
1107
1108 force_clean_group(group);
1109 }
1110 mutex_unlock(&ctx->mcg_table_lock);
1111
1112 if (!destroy_wq)
1113 ctx->flushing = 0;
1114 }
1115
1116 struct clean_work {
1117 struct work_struct work;
1118 struct mlx4_ib_demux_ctx *ctx;
1119 int destroy_wq;
1120 };
1121
1122 static void mcg_clean_task(struct work_struct *work)
1123 {
1124 struct clean_work *cw = container_of(work, struct clean_work, work);
1125
1126 _mlx4_ib_mcg_port_cleanup(cw->ctx, cw->destroy_wq);
1127 kfree(cw);
1128 }
1129
1130 void mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq)
1131 {
1132 struct clean_work *work;
1133
1134 if (destroy_wq) {
1135 _mlx4_ib_mcg_port_cleanup(ctx, destroy_wq);
1136 return;
1137 }
1138
1139 work = kmalloc(sizeof *work, GFP_KERNEL);
1140 if (!work) {
1141 mcg_warn("failed allocating work for cleanup\n");
1142 return;
1143 }
1144
1145 work->ctx = ctx;
1146 work->destroy_wq = destroy_wq;
1147 INIT_WORK(&work->work, mcg_clean_task);
1148 queue_work(clean_wq, &work->work);
1149 }
1150
1151 static void build_leave_mad(struct mcast_req *req)
1152 {
1153 struct ib_sa_mad *mad = &req->sa_mad;
1154
1155 mad->mad_hdr.method = IB_SA_METHOD_DELETE;
1156 }
1157
1158
1159 static void clear_pending_reqs(struct mcast_group *group, int vf)
1160 {
1161 struct mcast_req *req, *tmp, *group_first = NULL;
1162 int clear;
1163 int pend = 0;
1164
1165 if (!list_empty(&group->pending_list))
1166 group_first = list_first_entry(&group->pending_list, struct mcast_req, group_list);
1167
1168 list_for_each_entry_safe(req, tmp, &group->func[vf].pending, func_list) {
1169 clear = 1;
1170 if (group_first == req &&
1171 (group->state == MCAST_JOIN_SENT ||
1172 group->state == MCAST_LEAVE_SENT)) {
1173 clear = cancel_delayed_work(&group->timeout_work);
1174 pend = !clear;
1175 group->state = MCAST_IDLE;
1176 }
1177 if (clear) {
1178 --group->func[vf].num_pend_reqs;
1179 list_del(&req->group_list);
1180 list_del(&req->func_list);
1181 kfree(req);
1182 atomic_dec(&group->refcount);
1183 }
1184 }
1185
1186 if (!pend && (!list_empty(&group->func[vf].pending) || group->func[vf].num_pend_reqs)) {
1187 mcg_warn_group(group, "DRIVER BUG: list_empty %d, num_pend_reqs %d\n",
1188 list_empty(&group->func[vf].pending), group->func[vf].num_pend_reqs);
1189 }
1190 }
1191
1192 static int push_deleteing_req(struct mcast_group *group, int slave)
1193 {
1194 struct mcast_req *req;
1195 struct mcast_req *pend_req;
1196
1197 if (!group->func[slave].join_state)
1198 return 0;
1199
1200 req = kzalloc(sizeof *req, GFP_KERNEL);
1201 if (!req) {
1202 mcg_warn_group(group, "failed allocation - may leave stall groups\n");
1203 return -ENOMEM;
1204 }
1205
1206 if (!list_empty(&group->func[slave].pending)) {
1207 pend_req = list_entry(group->func[slave].pending.prev, struct mcast_req, group_list);
1208 if (pend_req->clean) {
1209 kfree(req);
1210 return 0;
1211 }
1212 }
1213
1214 req->clean = 1;
1215 req->func = slave;
1216 req->group = group;
1217 ++group->func[slave].num_pend_reqs;
1218 build_leave_mad(req);
1219 queue_req(req);
1220 return 0;
1221 }
1222
1223 void clean_vf_mcast(struct mlx4_ib_demux_ctx *ctx, int slave)
1224 {
1225 struct mcast_group *group;
1226 struct rb_node *p;
1227
1228 mutex_lock(&ctx->mcg_table_lock);
1229 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) {
1230 group = rb_entry(p, struct mcast_group, node);
1231 mutex_lock(&group->lock);
1232 if (atomic_read(&group->refcount)) {
1233 /* clear pending requests of this VF */
1234 clear_pending_reqs(group, slave);
1235 push_deleteing_req(group, slave);
1236 }
1237 mutex_unlock(&group->lock);
1238 }
1239 mutex_unlock(&ctx->mcg_table_lock);
1240 }
1241
1242
1243 int mlx4_ib_mcg_init(void)
1244 {
1245 clean_wq = create_singlethread_workqueue("mlx4_ib_mcg");
1246 if (!clean_wq)
1247 return -ENOMEM;
1248
1249 return 0;
1250 }
1251
1252 void mlx4_ib_mcg_destroy(void)
1253 {
1254 destroy_workqueue(clean_wq);
1255 }
Linux kernel - Deliverables
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