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_debug_group(group, format, arg...) \
55 pr_debug("%s-%d: %16s (port %d): WARNING: " format, __func__, __LINE__,\
56 (group)->name, (group)->demux->port, ## arg)
57
58 #define mcg_error_group(group, format, arg...) \
59 pr_err(" %16s: " format, (group)->name, ## arg)
60
61
62 static union ib_gid mgid0;
63
64 static struct workqueue_struct *clean_wq;
65
66 enum mcast_state {
67 MCAST_NOT_MEMBER = 0,
68 MCAST_MEMBER,
69 };
70
71 enum mcast_group_state {
72 MCAST_IDLE,
73 MCAST_JOIN_SENT,
74 MCAST_LEAVE_SENT,
75 MCAST_RESP_READY
76 };
77
78 struct mcast_member {
79 enum mcast_state state;
80 uint8_t join_state;
81 int num_pend_reqs;
82 struct list_head pending;
83 };
84
85 struct ib_sa_mcmember_data {
86 union ib_gid mgid;
87 union ib_gid port_gid;
88 __be32 qkey;
89 __be16 mlid;
90 u8 mtusel_mtu;
91 u8 tclass;
92 __be16 pkey;
93 u8 ratesel_rate;
94 u8 lifetmsel_lifetm;
95 __be32 sl_flowlabel_hoplimit;
96 u8 scope_join_state;
97 u8 proxy_join;
98 u8 reserved[2];
99 } __packed __aligned(4);
100
101 struct mcast_group {
102 struct ib_sa_mcmember_data rec;
103 struct rb_node node;
104 struct list_head mgid0_list;
105 struct mlx4_ib_demux_ctx *demux;
106 struct mcast_member func[MAX_VFS];
107 struct mutex lock;
108 struct work_struct work;
109 struct list_head pending_list;
110 int members[3];
111 enum mcast_group_state state;
112 enum mcast_group_state prev_state;
113 struct ib_sa_mad response_sa_mad;
114 __be64 last_req_tid;
115
116 char name[33]; /* MGID string */
117 struct device_attribute dentry;
118
119 /* refcount is the reference count for the following:
120 1. Each queued request
121 2. Each invocation of the worker thread
122 3. Membership of the port at the SA
123 */
124 atomic_t refcount;
125
126 /* delayed work to clean pending SM request */
127 struct delayed_work timeout_work;
128 struct list_head cleanup_list;
129 };
130
131 struct mcast_req {
132 int func;
133 struct ib_sa_mad sa_mad;
134 struct list_head group_list;
135 struct list_head func_list;
136 struct mcast_group *group;
137 int clean;
138 };
139
140
141 #define safe_atomic_dec(ref) \
142 do {\
143 if (atomic_dec_and_test(ref)) \
144 mcg_warn_group(group, "did not expect to reach zero\n"); \
145 } while (0)
146
get_state_string(enum mcast_group_state state)147 static const char *get_state_string(enum mcast_group_state state)
148 {
149 switch (state) {
150 case MCAST_IDLE:
151 return "MCAST_IDLE";
152 case MCAST_JOIN_SENT:
153 return "MCAST_JOIN_SENT";
154 case MCAST_LEAVE_SENT:
155 return "MCAST_LEAVE_SENT";
156 case MCAST_RESP_READY:
157 return "MCAST_RESP_READY";
158 }
159 return "Invalid State";
160 }
161
mcast_find(struct mlx4_ib_demux_ctx * ctx,union ib_gid * mgid)162 static struct mcast_group *mcast_find(struct mlx4_ib_demux_ctx *ctx,
163 union ib_gid *mgid)
164 {
165 struct rb_node *node = ctx->mcg_table.rb_node;
166 struct mcast_group *group;
167 int ret;
168
169 while (node) {
170 group = rb_entry(node, struct mcast_group, node);
171 ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid);
172 if (!ret)
173 return group;
174
175 if (ret < 0)
176 node = node->rb_left;
177 else
178 node = node->rb_right;
179 }
180 return NULL;
181 }
182
mcast_insert(struct mlx4_ib_demux_ctx * ctx,struct mcast_group * group)183 static struct mcast_group *mcast_insert(struct mlx4_ib_demux_ctx *ctx,
184 struct mcast_group *group)
185 {
186 struct rb_node **link = &ctx->mcg_table.rb_node;
187 struct rb_node *parent = NULL;
188 struct mcast_group *cur_group;
189 int ret;
190
191 while (*link) {
192 parent = *link;
193 cur_group = rb_entry(parent, struct mcast_group, node);
194
195 ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw,
196 sizeof group->rec.mgid);
197 if (ret < 0)
198 link = &(*link)->rb_left;
199 else if (ret > 0)
200 link = &(*link)->rb_right;
201 else
202 return cur_group;
203 }
204 rb_link_node(&group->node, parent, link);
205 rb_insert_color(&group->node, &ctx->mcg_table);
206 return NULL;
207 }
208
send_mad_to_wire(struct mlx4_ib_demux_ctx * ctx,struct ib_mad * mad)209 static int send_mad_to_wire(struct mlx4_ib_demux_ctx *ctx, struct ib_mad *mad)
210 {
211 struct mlx4_ib_dev *dev = ctx->dev;
212 struct rdma_ah_attr ah_attr;
213 unsigned long flags;
214
215 spin_lock_irqsave(&dev->sm_lock, flags);
216 if (!dev->sm_ah[ctx->port - 1]) {
217 /* port is not yet Active, sm_ah not ready */
218 spin_unlock_irqrestore(&dev->sm_lock, flags);
219 return -EAGAIN;
220 }
221 mlx4_ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr);
222 spin_unlock_irqrestore(&dev->sm_lock, flags);
223 return mlx4_ib_send_to_wire(dev, mlx4_master_func_num(dev->dev),
224 ctx->port, IB_QPT_GSI, 0, 1, IB_QP1_QKEY,
225 &ah_attr, NULL, 0xffff, mad);
226 }
227
send_mad_to_slave(int slave,struct mlx4_ib_demux_ctx * ctx,struct ib_mad * mad)228 static int send_mad_to_slave(int slave, struct mlx4_ib_demux_ctx *ctx,
229 struct ib_mad *mad)
230 {
231 struct mlx4_ib_dev *dev = ctx->dev;
232 struct ib_mad_agent *agent = dev->send_agent[ctx->port - 1][1];
233 struct ib_wc wc;
234 struct rdma_ah_attr ah_attr;
235
236 /* Our agent might not yet be registered when mads start to arrive */
237 if (!agent)
238 return -EAGAIN;
239
240 rdma_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr);
241
242 if (ib_find_cached_pkey(&dev->ib_dev, ctx->port, IB_DEFAULT_PKEY_FULL, &wc.pkey_index))
243 return -EINVAL;
244 wc.sl = 0;
245 wc.dlid_path_bits = 0;
246 wc.port_num = ctx->port;
247 wc.slid = rdma_ah_get_dlid(&ah_attr); /* opensm lid */
248 wc.src_qp = 1;
249 return mlx4_ib_send_to_slave(dev, slave, ctx->port, IB_QPT_GSI, &wc, NULL, mad);
250 }
251
send_join_to_wire(struct mcast_group * group,struct ib_sa_mad * sa_mad)252 static int send_join_to_wire(struct mcast_group *group, struct ib_sa_mad *sa_mad)
253 {
254 struct ib_sa_mad mad;
255 struct ib_sa_mcmember_data *sa_mad_data = (struct ib_sa_mcmember_data *)&mad.data;
256 int ret;
257
258 /* we rely on a mad request as arrived from a VF */
259 memcpy(&mad, sa_mad, sizeof mad);
260
261 /* fix port GID to be the real one (slave 0) */
262 sa_mad_data->port_gid.global.interface_id = group->demux->guid_cache[0];
263
264 /* assign our own TID */
265 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux);
266 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */
267
268 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad);
269 /* set timeout handler */
270 if (!ret) {
271 /* calls mlx4_ib_mcg_timeout_handler */
272 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work,
273 msecs_to_jiffies(MAD_TIMEOUT_MS));
274 }
275
276 return ret;
277 }
278
send_leave_to_wire(struct mcast_group * group,u8 join_state)279 static int send_leave_to_wire(struct mcast_group *group, u8 join_state)
280 {
281 struct ib_sa_mad mad;
282 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data;
283 int ret;
284
285 memset(&mad, 0, sizeof mad);
286 mad.mad_hdr.base_version = 1;
287 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
288 mad.mad_hdr.class_version = 2;
289 mad.mad_hdr.method = IB_SA_METHOD_DELETE;
290 mad.mad_hdr.status = cpu_to_be16(0);
291 mad.mad_hdr.class_specific = cpu_to_be16(0);
292 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux);
293 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */
294 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
295 mad.mad_hdr.attr_mod = cpu_to_be32(0);
296 mad.sa_hdr.sm_key = 0x0;
297 mad.sa_hdr.attr_offset = cpu_to_be16(7);
298 mad.sa_hdr.comp_mask = IB_SA_MCMEMBER_REC_MGID |
299 IB_SA_MCMEMBER_REC_PORT_GID | IB_SA_MCMEMBER_REC_JOIN_STATE;
300
301 *sa_data = group->rec;
302 sa_data->scope_join_state = join_state;
303
304 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad);
305 if (ret)
306 group->state = MCAST_IDLE;
307
308 /* set timeout handler */
309 if (!ret) {
310 /* calls mlx4_ib_mcg_timeout_handler */
311 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work,
312 msecs_to_jiffies(MAD_TIMEOUT_MS));
313 }
314
315 return ret;
316 }
317
send_reply_to_slave(int slave,struct mcast_group * group,struct ib_sa_mad * req_sa_mad,u16 status)318 static int send_reply_to_slave(int slave, struct mcast_group *group,
319 struct ib_sa_mad *req_sa_mad, u16 status)
320 {
321 struct ib_sa_mad mad;
322 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data;
323 struct ib_sa_mcmember_data *req_sa_data = (struct ib_sa_mcmember_data *)&req_sa_mad->data;
324 int ret;
325
326 memset(&mad, 0, sizeof mad);
327 mad.mad_hdr.base_version = 1;
328 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
329 mad.mad_hdr.class_version = 2;
330 mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
331 mad.mad_hdr.status = cpu_to_be16(status);
332 mad.mad_hdr.class_specific = cpu_to_be16(0);
333 mad.mad_hdr.tid = req_sa_mad->mad_hdr.tid;
334 *(u8 *)&mad.mad_hdr.tid = 0; /* resetting tid to 0 */
335 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
336 mad.mad_hdr.attr_mod = cpu_to_be32(0);
337 mad.sa_hdr.sm_key = req_sa_mad->sa_hdr.sm_key;
338 mad.sa_hdr.attr_offset = cpu_to_be16(7);
339 mad.sa_hdr.comp_mask = 0; /* ignored on responses, see IBTA spec */
340
341 *sa_data = group->rec;
342
343 /* reconstruct VF's requested join_state and port_gid */
344 sa_data->scope_join_state &= 0xf0;
345 sa_data->scope_join_state |= (group->func[slave].join_state & 0x0f);
346 memcpy(&sa_data->port_gid, &req_sa_data->port_gid, sizeof req_sa_data->port_gid);
347
348 ret = send_mad_to_slave(slave, group->demux, (struct ib_mad *)&mad);
349 return ret;
350 }
351
check_selector(ib_sa_comp_mask comp_mask,ib_sa_comp_mask selector_mask,ib_sa_comp_mask value_mask,u8 src_value,u8 dst_value)352 static int check_selector(ib_sa_comp_mask comp_mask,
353 ib_sa_comp_mask selector_mask,
354 ib_sa_comp_mask value_mask,
355 u8 src_value, u8 dst_value)
356 {
357 int err;
358 u8 selector = dst_value >> 6;
359 dst_value &= 0x3f;
360 src_value &= 0x3f;
361
362 if (!(comp_mask & selector_mask) || !(comp_mask & value_mask))
363 return 0;
364
365 switch (selector) {
366 case IB_SA_GT:
367 err = (src_value <= dst_value);
368 break;
369 case IB_SA_LT:
370 err = (src_value >= dst_value);
371 break;
372 case IB_SA_EQ:
373 err = (src_value != dst_value);
374 break;
375 default:
376 err = 0;
377 break;
378 }
379
380 return err;
381 }
382
cmp_rec(struct ib_sa_mcmember_data * src,struct ib_sa_mcmember_data * dst,ib_sa_comp_mask comp_mask)383 static u16 cmp_rec(struct ib_sa_mcmember_data *src,
384 struct ib_sa_mcmember_data *dst, ib_sa_comp_mask comp_mask)
385 {
386 /* src is group record, dst is request record */
387 /* MGID must already match */
388 /* Port_GID we always replace to our Port_GID, so it is a match */
389
390 #define MAD_STATUS_REQ_INVALID 0x0200
391 if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey)
392 return MAD_STATUS_REQ_INVALID;
393 if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid)
394 return MAD_STATUS_REQ_INVALID;
395 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR,
396 IB_SA_MCMEMBER_REC_MTU,
397 src->mtusel_mtu, dst->mtusel_mtu))
398 return MAD_STATUS_REQ_INVALID;
399 if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS &&
400 src->tclass != dst->tclass)
401 return MAD_STATUS_REQ_INVALID;
402 if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey)
403 return MAD_STATUS_REQ_INVALID;
404 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR,
405 IB_SA_MCMEMBER_REC_RATE,
406 src->ratesel_rate, dst->ratesel_rate))
407 return MAD_STATUS_REQ_INVALID;
408 if (check_selector(comp_mask,
409 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR,
410 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME,
411 src->lifetmsel_lifetm, dst->lifetmsel_lifetm))
412 return MAD_STATUS_REQ_INVALID;
413 if (comp_mask & IB_SA_MCMEMBER_REC_SL &&
414 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0xf0000000) !=
415 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0xf0000000))
416 return MAD_STATUS_REQ_INVALID;
417 if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL &&
418 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x0fffff00) !=
419 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x0fffff00))
420 return MAD_STATUS_REQ_INVALID;
421 if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT &&
422 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x000000ff) !=
423 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x000000ff))
424 return MAD_STATUS_REQ_INVALID;
425 if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE &&
426 (src->scope_join_state & 0xf0) !=
427 (dst->scope_join_state & 0xf0))
428 return MAD_STATUS_REQ_INVALID;
429
430 /* join_state checked separately, proxy_join ignored */
431
432 return 0;
433 }
434
435 /* release group, return 1 if this was last release and group is destroyed
436 * timout work is canceled sync */
release_group(struct mcast_group * group,int from_timeout_handler)437 static int release_group(struct mcast_group *group, int from_timeout_handler)
438 {
439 struct mlx4_ib_demux_ctx *ctx = group->demux;
440 int nzgroup;
441
442 mutex_lock(&ctx->mcg_table_lock);
443 mutex_lock(&group->lock);
444 if (atomic_dec_and_test(&group->refcount)) {
445 if (!from_timeout_handler) {
446 if (group->state != MCAST_IDLE &&
447 !cancel_delayed_work(&group->timeout_work)) {
448 atomic_inc(&group->refcount);
449 mutex_unlock(&group->lock);
450 mutex_unlock(&ctx->mcg_table_lock);
451 return 0;
452 }
453 }
454
455 nzgroup = memcmp(&group->rec.mgid, &mgid0, sizeof mgid0);
456 if (nzgroup)
457 del_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
458 if (!list_empty(&group->pending_list))
459 mcg_warn_group(group, "releasing a group with non empty pending list\n");
460 if (nzgroup)
461 rb_erase(&group->node, &ctx->mcg_table);
462 list_del_init(&group->mgid0_list);
463 mutex_unlock(&group->lock);
464 mutex_unlock(&ctx->mcg_table_lock);
465 kfree(group);
466 return 1;
467 } else {
468 mutex_unlock(&group->lock);
469 mutex_unlock(&ctx->mcg_table_lock);
470 }
471 return 0;
472 }
473
adjust_membership(struct mcast_group * group,u8 join_state,int inc)474 static void adjust_membership(struct mcast_group *group, u8 join_state, int inc)
475 {
476 int i;
477
478 for (i = 0; i < 3; i++, join_state >>= 1)
479 if (join_state & 0x1)
480 group->members[i] += inc;
481 }
482
get_leave_state(struct mcast_group * group)483 static u8 get_leave_state(struct mcast_group *group)
484 {
485 u8 leave_state = 0;
486 int i;
487
488 for (i = 0; i < 3; i++)
489 if (!group->members[i])
490 leave_state |= (1 << i);
491
492 return leave_state & (group->rec.scope_join_state & 0xf);
493 }
494
join_group(struct mcast_group * group,int slave,u8 join_mask)495 static int join_group(struct mcast_group *group, int slave, u8 join_mask)
496 {
497 int ret = 0;
498 u8 join_state;
499
500 /* remove bits that slave is already member of, and adjust */
501 join_state = join_mask & (~group->func[slave].join_state);
502 adjust_membership(group, join_state, 1);
503 group->func[slave].join_state |= join_state;
504 if (group->func[slave].state != MCAST_MEMBER && join_state) {
505 group->func[slave].state = MCAST_MEMBER;
506 ret = 1;
507 }
508 return ret;
509 }
510
leave_group(struct mcast_group * group,int slave,u8 leave_state)511 static int leave_group(struct mcast_group *group, int slave, u8 leave_state)
512 {
513 int ret = 0;
514
515 adjust_membership(group, leave_state, -1);
516 group->func[slave].join_state &= ~leave_state;
517 if (!group->func[slave].join_state) {
518 group->func[slave].state = MCAST_NOT_MEMBER;
519 ret = 1;
520 }
521 return ret;
522 }
523
check_leave(struct mcast_group * group,int slave,u8 leave_mask)524 static int check_leave(struct mcast_group *group, int slave, u8 leave_mask)
525 {
526 if (group->func[slave].state != MCAST_MEMBER)
527 return MAD_STATUS_REQ_INVALID;
528
529 /* make sure we're not deleting unset bits */
530 if (~group->func[slave].join_state & leave_mask)
531 return MAD_STATUS_REQ_INVALID;
532
533 if (!leave_mask)
534 return MAD_STATUS_REQ_INVALID;
535
536 return 0;
537 }
538
mlx4_ib_mcg_timeout_handler(struct work_struct * work)539 static void mlx4_ib_mcg_timeout_handler(struct work_struct *work)
540 {
541 struct delayed_work *delay = to_delayed_work(work);
542 struct mcast_group *group;
543 struct mcast_req *req = NULL;
544
545 group = container_of(delay, typeof(*group), timeout_work);
546
547 mutex_lock(&group->lock);
548 if (group->state == MCAST_JOIN_SENT) {
549 if (!list_empty(&group->pending_list)) {
550 req = list_first_entry(&group->pending_list, struct mcast_req, group_list);
551 list_del(&req->group_list);
552 list_del(&req->func_list);
553 --group->func[req->func].num_pend_reqs;
554 mutex_unlock(&group->lock);
555 kfree(req);
556 if (memcmp(&group->rec.mgid, &mgid0, sizeof mgid0)) {
557 if (release_group(group, 1))
558 return;
559 } else {
560 kfree(group);
561 return;
562 }
563 mutex_lock(&group->lock);
564 } else
565 mcg_warn_group(group, "DRIVER BUG\n");
566 } else if (group->state == MCAST_LEAVE_SENT) {
567 if (group->rec.scope_join_state & 0xf)
568 group->rec.scope_join_state &= 0xf0;
569 group->state = MCAST_IDLE;
570 mutex_unlock(&group->lock);
571 if (release_group(group, 1))
572 return;
573 mutex_lock(&group->lock);
574 } else
575 mcg_warn_group(group, "invalid state %s\n", get_state_string(group->state));
576 group->state = MCAST_IDLE;
577 atomic_inc(&group->refcount);
578 if (!queue_work(group->demux->mcg_wq, &group->work))
579 safe_atomic_dec(&group->refcount);
580
581 mutex_unlock(&group->lock);
582 }
583
handle_leave_req(struct mcast_group * group,u8 leave_mask,struct mcast_req * req)584 static int handle_leave_req(struct mcast_group *group, u8 leave_mask,
585 struct mcast_req *req)
586 {
587 u16 status;
588
589 if (req->clean)
590 leave_mask = group->func[req->func].join_state;
591
592 status = check_leave(group, req->func, leave_mask);
593 if (!status)
594 leave_group(group, req->func, leave_mask);
595
596 if (!req->clean)
597 send_reply_to_slave(req->func, group, &req->sa_mad, status);
598 --group->func[req->func].num_pend_reqs;
599 list_del(&req->group_list);
600 list_del(&req->func_list);
601 kfree(req);
602 return 1;
603 }
604
handle_join_req(struct mcast_group * group,u8 join_mask,struct mcast_req * req)605 static int handle_join_req(struct mcast_group *group, u8 join_mask,
606 struct mcast_req *req)
607 {
608 u8 group_join_state = group->rec.scope_join_state & 0xf;
609 int ref = 0;
610 u16 status;
611 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data;
612
613 if (join_mask == (group_join_state & join_mask)) {
614 /* port's membership need not change */
615 status = cmp_rec(&group->rec, sa_data, req->sa_mad.sa_hdr.comp_mask);
616 if (!status)
617 join_group(group, req->func, join_mask);
618
619 --group->func[req->func].num_pend_reqs;
620 send_reply_to_slave(req->func, group, &req->sa_mad, status);
621 list_del(&req->group_list);
622 list_del(&req->func_list);
623 kfree(req);
624 ++ref;
625 } else {
626 /* port's membership needs to be updated */
627 group->prev_state = group->state;
628 if (send_join_to_wire(group, &req->sa_mad)) {
629 --group->func[req->func].num_pend_reqs;
630 list_del(&req->group_list);
631 list_del(&req->func_list);
632 kfree(req);
633 ref = 1;
634 group->state = group->prev_state;
635 } else
636 group->state = MCAST_JOIN_SENT;
637 }
638
639 return ref;
640 }
641
mlx4_ib_mcg_work_handler(struct work_struct * work)642 static void mlx4_ib_mcg_work_handler(struct work_struct *work)
643 {
644 struct mcast_group *group;
645 struct mcast_req *req = NULL;
646 struct ib_sa_mcmember_data *sa_data;
647 u8 req_join_state;
648 int rc = 1; /* release_count - this is for the scheduled work */
649 u16 status;
650 u8 method;
651
652 group = container_of(work, typeof(*group), work);
653
654 mutex_lock(&group->lock);
655
656 /* First, let's see if a response from SM is waiting regarding this group.
657 * If so, we need to update the group's REC. If this is a bad response, we
658 * may need to send a bad response to a VF waiting for it. If VF is waiting
659 * and this is a good response, the VF will be answered later in this func. */
660 if (group->state == MCAST_RESP_READY) {
661 /* cancels mlx4_ib_mcg_timeout_handler */
662 cancel_delayed_work(&group->timeout_work);
663 status = be16_to_cpu(group->response_sa_mad.mad_hdr.status);
664 method = group->response_sa_mad.mad_hdr.method;
665 if (group->last_req_tid != group->response_sa_mad.mad_hdr.tid) {
666 mcg_warn_group(group, "Got MAD response to existing MGID but wrong TID, dropping. Resp TID=%llx, group TID=%llx\n",
667 be64_to_cpu(group->response_sa_mad.mad_hdr.tid),
668 be64_to_cpu(group->last_req_tid));
669 group->state = group->prev_state;
670 goto process_requests;
671 }
672 if (status) {
673 if (!list_empty(&group->pending_list))
674 req = list_first_entry(&group->pending_list,
675 struct mcast_req, group_list);
676 if (method == IB_MGMT_METHOD_GET_RESP) {
677 if (req) {
678 send_reply_to_slave(req->func, group, &req->sa_mad, status);
679 --group->func[req->func].num_pend_reqs;
680 list_del(&req->group_list);
681 list_del(&req->func_list);
682 kfree(req);
683 ++rc;
684 } else
685 mcg_warn_group(group, "no request for failed join\n");
686 } else if (method == IB_SA_METHOD_DELETE_RESP && group->demux->flushing)
687 ++rc;
688 } else {
689 u8 resp_join_state;
690 u8 cur_join_state;
691
692 resp_join_state = ((struct ib_sa_mcmember_data *)
693 group->response_sa_mad.data)->scope_join_state & 0xf;
694 cur_join_state = group->rec.scope_join_state & 0xf;
695
696 if (method == IB_MGMT_METHOD_GET_RESP) {
697 /* successfull join */
698 if (!cur_join_state && resp_join_state)
699 --rc;
700 } else if (!resp_join_state)
701 ++rc;
702 memcpy(&group->rec, group->response_sa_mad.data, sizeof group->rec);
703 }
704 group->state = MCAST_IDLE;
705 }
706
707 process_requests:
708 /* We should now go over pending join/leave requests, as long as we are idle. */
709 while (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) {
710 req = list_first_entry(&group->pending_list, struct mcast_req,
711 group_list);
712 sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data;
713 req_join_state = sa_data->scope_join_state & 0xf;
714
715 /* For a leave request, we will immediately answer the VF, and
716 * update our internal counters. The actual leave will be sent
717 * to SM later, if at all needed. We dequeue the request now. */
718 if (req->sa_mad.mad_hdr.method == IB_SA_METHOD_DELETE)
719 rc += handle_leave_req(group, req_join_state, req);
720 else
721 rc += handle_join_req(group, req_join_state, req);
722 }
723
724 /* Handle leaves */
725 if (group->state == MCAST_IDLE) {
726 req_join_state = get_leave_state(group);
727 if (req_join_state) {
728 group->rec.scope_join_state &= ~req_join_state;
729 group->prev_state = group->state;
730 if (send_leave_to_wire(group, req_join_state)) {
731 group->state = group->prev_state;
732 ++rc;
733 } else
734 group->state = MCAST_LEAVE_SENT;
735 }
736 }
737
738 if (!list_empty(&group->pending_list) && group->state == MCAST_IDLE)
739 goto process_requests;
740 mutex_unlock(&group->lock);
741
742 while (rc--)
743 release_group(group, 0);
744 }
745
search_relocate_mgid0_group(struct mlx4_ib_demux_ctx * ctx,__be64 tid,union ib_gid * new_mgid)746 static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx *ctx,
747 __be64 tid,
748 union ib_gid *new_mgid)
749 {
750 struct mcast_group *group = NULL, *cur_group, *n;
751 struct mcast_req *req;
752
753 mutex_lock(&ctx->mcg_table_lock);
754 list_for_each_entry_safe(group, n, &ctx->mcg_mgid0_list, mgid0_list) {
755 mutex_lock(&group->lock);
756 if (group->last_req_tid == tid) {
757 if (memcmp(new_mgid, &mgid0, sizeof mgid0)) {
758 group->rec.mgid = *new_mgid;
759 sprintf(group->name, "%016llx%016llx",
760 be64_to_cpu(group->rec.mgid.global.subnet_prefix),
761 be64_to_cpu(group->rec.mgid.global.interface_id));
762 list_del_init(&group->mgid0_list);
763 cur_group = mcast_insert(ctx, group);
764 if (cur_group) {
765 /* A race between our code and SM. Silently cleaning the new one */
766 req = list_first_entry(&group->pending_list,
767 struct mcast_req, group_list);
768 --group->func[req->func].num_pend_reqs;
769 list_del(&req->group_list);
770 list_del(&req->func_list);
771 kfree(req);
772 mutex_unlock(&group->lock);
773 mutex_unlock(&ctx->mcg_table_lock);
774 release_group(group, 0);
775 return NULL;
776 }
777
778 atomic_inc(&group->refcount);
779 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
780 mutex_unlock(&group->lock);
781 mutex_unlock(&ctx->mcg_table_lock);
782 return group;
783 } else {
784 struct mcast_req *tmp1, *tmp2;
785
786 list_del(&group->mgid0_list);
787 if (!list_empty(&group->pending_list) && group->state != MCAST_IDLE)
788 cancel_delayed_work_sync(&group->timeout_work);
789
790 list_for_each_entry_safe(tmp1, tmp2, &group->pending_list, group_list) {
791 list_del(&tmp1->group_list);
792 kfree(tmp1);
793 }
794 mutex_unlock(&group->lock);
795 mutex_unlock(&ctx->mcg_table_lock);
796 kfree(group);
797 return NULL;
798 }
799 }
800 mutex_unlock(&group->lock);
801 }
802 mutex_unlock(&ctx->mcg_table_lock);
803
804 return NULL;
805 }
806
807 static ssize_t sysfs_show_group(struct device *dev,
808 struct device_attribute *attr, char *buf);
809
acquire_group(struct mlx4_ib_demux_ctx * ctx,union ib_gid * mgid,int create)810 static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx,
811 union ib_gid *mgid, int create)
812 {
813 struct mcast_group *group, *cur_group;
814 int is_mgid0;
815 int i;
816
817 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
818 if (!is_mgid0) {
819 group = mcast_find(ctx, mgid);
820 if (group)
821 goto found;
822 }
823
824 if (!create)
825 return ERR_PTR(-ENOENT);
826
827 group = kzalloc(sizeof(*group), GFP_KERNEL);
828 if (!group)
829 return ERR_PTR(-ENOMEM);
830
831 group->demux = ctx;
832 group->rec.mgid = *mgid;
833 INIT_LIST_HEAD(&group->pending_list);
834 INIT_LIST_HEAD(&group->mgid0_list);
835 for (i = 0; i < MAX_VFS; ++i)
836 INIT_LIST_HEAD(&group->func[i].pending);
837 INIT_WORK(&group->work, mlx4_ib_mcg_work_handler);
838 INIT_DELAYED_WORK(&group->timeout_work, mlx4_ib_mcg_timeout_handler);
839 mutex_init(&group->lock);
840 sprintf(group->name, "%016llx%016llx",
841 be64_to_cpu(group->rec.mgid.global.subnet_prefix),
842 be64_to_cpu(group->rec.mgid.global.interface_id));
843 sysfs_attr_init(&group->dentry.attr);
844 group->dentry.show = sysfs_show_group;
845 group->dentry.store = NULL;
846 group->dentry.attr.name = group->name;
847 group->dentry.attr.mode = 0400;
848 group->state = MCAST_IDLE;
849
850 if (is_mgid0) {
851 list_add(&group->mgid0_list, &ctx->mcg_mgid0_list);
852 goto found;
853 }
854
855 cur_group = mcast_insert(ctx, group);
856 if (cur_group) {
857 mcg_warn("group just showed up %s - confused\n", cur_group->name);
858 kfree(group);
859 return ERR_PTR(-EINVAL);
860 }
861
862 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
863
864 found:
865 atomic_inc(&group->refcount);
866 return group;
867 }
868
queue_req(struct mcast_req * req)869 static void queue_req(struct mcast_req *req)
870 {
871 struct mcast_group *group = req->group;
872
873 atomic_inc(&group->refcount); /* for the request */
874 atomic_inc(&group->refcount); /* for scheduling the work */
875 list_add_tail(&req->group_list, &group->pending_list);
876 list_add_tail(&req->func_list, &group->func[req->func].pending);
877 /* calls mlx4_ib_mcg_work_handler */
878 if (!queue_work(group->demux->mcg_wq, &group->work))
879 safe_atomic_dec(&group->refcount);
880 }
881
mlx4_ib_mcg_demux_handler(struct ib_device * ibdev,int port,int slave,struct ib_sa_mad * mad)882 int mlx4_ib_mcg_demux_handler(struct ib_device *ibdev, int port, int slave,
883 struct ib_sa_mad *mad)
884 {
885 struct mlx4_ib_dev *dev = to_mdev(ibdev);
886 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)mad->data;
887 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1];
888 struct mcast_group *group;
889
890 switch (mad->mad_hdr.method) {
891 case IB_MGMT_METHOD_GET_RESP:
892 case IB_SA_METHOD_DELETE_RESP:
893 mutex_lock(&ctx->mcg_table_lock);
894 group = acquire_group(ctx, &rec->mgid, 0);
895 mutex_unlock(&ctx->mcg_table_lock);
896 if (IS_ERR(group)) {
897 if (mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP) {
898 __be64 tid = mad->mad_hdr.tid;
899 *(u8 *)(&tid) = (u8)slave; /* in group we kept the modified TID */
900 group = search_relocate_mgid0_group(ctx, tid, &rec->mgid);
901 } else
902 group = NULL;
903 }
904
905 if (!group)
906 return 1;
907
908 mutex_lock(&group->lock);
909 group->response_sa_mad = *mad;
910 group->prev_state = group->state;
911 group->state = MCAST_RESP_READY;
912 /* calls mlx4_ib_mcg_work_handler */
913 atomic_inc(&group->refcount);
914 if (!queue_work(ctx->mcg_wq, &group->work))
915 safe_atomic_dec(&group->refcount);
916 mutex_unlock(&group->lock);
917 release_group(group, 0);
918 return 1; /* consumed */
919 case IB_MGMT_METHOD_SET:
920 case IB_SA_METHOD_GET_TABLE:
921 case IB_SA_METHOD_GET_TABLE_RESP:
922 case IB_SA_METHOD_DELETE:
923 return 0; /* not consumed, pass-through to guest over tunnel */
924 default:
925 mcg_warn("In demux, port %d: unexpected MCMember method: 0x%x, dropping\n",
926 port, mad->mad_hdr.method);
927 return 1; /* consumed */
928 }
929 }
930
mlx4_ib_mcg_multiplex_handler(struct ib_device * ibdev,int port,int slave,struct ib_sa_mad * sa_mad)931 int mlx4_ib_mcg_multiplex_handler(struct ib_device *ibdev, int port,
932 int slave, struct ib_sa_mad *sa_mad)
933 {
934 struct mlx4_ib_dev *dev = to_mdev(ibdev);
935 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)sa_mad->data;
936 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1];
937 struct mcast_group *group;
938 struct mcast_req *req;
939 int may_create = 0;
940
941 if (ctx->flushing)
942 return -EAGAIN;
943
944 switch (sa_mad->mad_hdr.method) {
945 case IB_MGMT_METHOD_SET:
946 may_create = 1;
947 fallthrough;
948 case IB_SA_METHOD_DELETE:
949 req = kzalloc(sizeof *req, GFP_KERNEL);
950 if (!req)
951 return -ENOMEM;
952
953 req->func = slave;
954 req->sa_mad = *sa_mad;
955
956 mutex_lock(&ctx->mcg_table_lock);
957 group = acquire_group(ctx, &rec->mgid, may_create);
958 mutex_unlock(&ctx->mcg_table_lock);
959 if (IS_ERR(group)) {
960 kfree(req);
961 return PTR_ERR(group);
962 }
963 mutex_lock(&group->lock);
964 if (group->func[slave].num_pend_reqs > MAX_PEND_REQS_PER_FUNC) {
965 mutex_unlock(&group->lock);
966 mcg_debug_group(group, "Port %d, Func %d has too many pending requests (%d), dropping\n",
967 port, slave, MAX_PEND_REQS_PER_FUNC);
968 release_group(group, 0);
969 kfree(req);
970 return -ENOMEM;
971 }
972 ++group->func[slave].num_pend_reqs;
973 req->group = group;
974 queue_req(req);
975 mutex_unlock(&group->lock);
976 release_group(group, 0);
977 return 1; /* consumed */
978 case IB_SA_METHOD_GET_TABLE:
979 case IB_MGMT_METHOD_GET_RESP:
980 case IB_SA_METHOD_GET_TABLE_RESP:
981 case IB_SA_METHOD_DELETE_RESP:
982 return 0; /* not consumed, pass-through */
983 default:
984 mcg_warn("In multiplex, port %d, func %d: unexpected MCMember method: 0x%x, dropping\n",
985 port, slave, sa_mad->mad_hdr.method);
986 return 1; /* consumed */
987 }
988 }
989
sysfs_show_group(struct device * dev,struct device_attribute * attr,char * buf)990 static ssize_t sysfs_show_group(struct device *dev,
991 struct device_attribute *attr, char *buf)
992 {
993 struct mcast_group *group =
994 container_of(attr, struct mcast_group, dentry);
995 struct mcast_req *req = NULL;
996 char pending_str[40];
997 char state_str[40];
998 ssize_t len = 0;
999 int f;
1000
1001 if (group->state == MCAST_IDLE)
1002 sprintf(state_str, "%s", get_state_string(group->state));
1003 else
1004 sprintf(state_str, "%s(TID=0x%llx)",
1005 get_state_string(group->state),
1006 be64_to_cpu(group->last_req_tid));
1007 if (list_empty(&group->pending_list)) {
1008 sprintf(pending_str, "No");
1009 } else {
1010 req = list_first_entry(&group->pending_list, struct mcast_req, group_list);
1011 sprintf(pending_str, "Yes(TID=0x%llx)",
1012 be64_to_cpu(req->sa_mad.mad_hdr.tid));
1013 }
1014 len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s ",
1015 group->rec.scope_join_state & 0xf,
1016 group->members[2], group->members[1], group->members[0],
1017 atomic_read(&group->refcount),
1018 pending_str,
1019 state_str);
1020 for (f = 0; f < MAX_VFS; ++f)
1021 if (group->func[f].state == MCAST_MEMBER)
1022 len += sprintf(buf + len, "%d[%1x] ",
1023 f, group->func[f].join_state);
1024
1025 len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x "
1026 "%4x %4x %2x %2x)\n",
1027 be16_to_cpu(group->rec.pkey),
1028 be32_to_cpu(group->rec.qkey),
1029 (group->rec.mtusel_mtu & 0xc0) >> 6,
1030 group->rec.mtusel_mtu & 0x3f,
1031 group->rec.tclass,
1032 (group->rec.ratesel_rate & 0xc0) >> 6,
1033 group->rec.ratesel_rate & 0x3f,
1034 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28,
1035 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8,
1036 be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff,
1037 group->rec.proxy_join);
1038
1039 return len;
1040 }
1041
mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx * ctx)1042 int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx)
1043 {
1044 char name[20];
1045
1046 atomic_set(&ctx->tid, 0);
1047 sprintf(name, "mlx4_ib_mcg%d", ctx->port);
1048 ctx->mcg_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
1049 if (!ctx->mcg_wq)
1050 return -ENOMEM;
1051
1052 mutex_init(&ctx->mcg_table_lock);
1053 ctx->mcg_table = RB_ROOT;
1054 INIT_LIST_HEAD(&ctx->mcg_mgid0_list);
1055 ctx->flushing = 0;
1056
1057 return 0;
1058 }
1059
force_clean_group(struct mcast_group * group)1060 static void force_clean_group(struct mcast_group *group)
1061 {
1062 struct mcast_req *req, *tmp
1063 ;
1064 list_for_each_entry_safe(req, tmp, &group->pending_list, group_list) {
1065 list_del(&req->group_list);
1066 kfree(req);
1067 }
1068 del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr);
1069 rb_erase(&group->node, &group->demux->mcg_table);
1070 kfree(group);
1071 }
1072
_mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx * ctx,int destroy_wq)1073 static void _mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq)
1074 {
1075 int i;
1076 struct rb_node *p;
1077 struct mcast_group *group;
1078 unsigned long end;
1079 int count;
1080
1081 for (i = 0; i < MAX_VFS; ++i)
1082 clean_vf_mcast(ctx, i);
1083
1084 end = jiffies + msecs_to_jiffies(MAD_TIMEOUT_MS + 3000);
1085 do {
1086 count = 0;
1087 mutex_lock(&ctx->mcg_table_lock);
1088 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p))
1089 ++count;
1090 mutex_unlock(&ctx->mcg_table_lock);
1091 if (!count)
1092 break;
1093
1094 usleep_range(1000, 2000);
1095 } while (time_after(end, jiffies));
1096
1097 flush_workqueue(ctx->mcg_wq);
1098 if (destroy_wq)
1099 destroy_workqueue(ctx->mcg_wq);
1100
1101 mutex_lock(&ctx->mcg_table_lock);
1102 while ((p = rb_first(&ctx->mcg_table)) != NULL) {
1103 group = rb_entry(p, struct mcast_group, node);
1104 if (atomic_read(&group->refcount))
1105 mcg_debug_group(group, "group refcount %d!!! (pointer %p)\n",
1106 atomic_read(&group->refcount), group);
1107
1108 force_clean_group(group);
1109 }
1110 mutex_unlock(&ctx->mcg_table_lock);
1111 }
1112
1113 struct clean_work {
1114 struct work_struct work;
1115 struct mlx4_ib_demux_ctx *ctx;
1116 int destroy_wq;
1117 };
1118
mcg_clean_task(struct work_struct * work)1119 static void mcg_clean_task(struct work_struct *work)
1120 {
1121 struct clean_work *cw = container_of(work, struct clean_work, work);
1122
1123 _mlx4_ib_mcg_port_cleanup(cw->ctx, cw->destroy_wq);
1124 cw->ctx->flushing = 0;
1125 kfree(cw);
1126 }
1127
mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx * ctx,int destroy_wq)1128 void mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq)
1129 {
1130 struct clean_work *work;
1131
1132 if (ctx->flushing)
1133 return;
1134
1135 ctx->flushing = 1;
1136
1137 if (destroy_wq) {
1138 _mlx4_ib_mcg_port_cleanup(ctx, destroy_wq);
1139 ctx->flushing = 0;
1140 return;
1141 }
1142
1143 work = kmalloc(sizeof *work, GFP_KERNEL);
1144 if (!work) {
1145 ctx->flushing = 0;
1146 return;
1147 }
1148
1149 work->ctx = ctx;
1150 work->destroy_wq = destroy_wq;
1151 INIT_WORK(&work->work, mcg_clean_task);
1152 queue_work(clean_wq, &work->work);
1153 }
1154
build_leave_mad(struct mcast_req * req)1155 static void build_leave_mad(struct mcast_req *req)
1156 {
1157 struct ib_sa_mad *mad = &req->sa_mad;
1158
1159 mad->mad_hdr.method = IB_SA_METHOD_DELETE;
1160 }
1161
1162
clear_pending_reqs(struct mcast_group * group,int vf)1163 static void clear_pending_reqs(struct mcast_group *group, int vf)
1164 {
1165 struct mcast_req *req, *tmp, *group_first = NULL;
1166 int clear;
1167 int pend = 0;
1168
1169 if (!list_empty(&group->pending_list))
1170 group_first = list_first_entry(&group->pending_list, struct mcast_req, group_list);
1171
1172 list_for_each_entry_safe(req, tmp, &group->func[vf].pending, func_list) {
1173 clear = 1;
1174 if (group_first == req &&
1175 (group->state == MCAST_JOIN_SENT ||
1176 group->state == MCAST_LEAVE_SENT)) {
1177 clear = cancel_delayed_work(&group->timeout_work);
1178 pend = !clear;
1179 group->state = MCAST_IDLE;
1180 }
1181 if (clear) {
1182 --group->func[vf].num_pend_reqs;
1183 list_del(&req->group_list);
1184 list_del(&req->func_list);
1185 kfree(req);
1186 atomic_dec(&group->refcount);
1187 }
1188 }
1189
1190 if (!pend && (!list_empty(&group->func[vf].pending) || group->func[vf].num_pend_reqs)) {
1191 mcg_warn_group(group, "DRIVER BUG: list_empty %d, num_pend_reqs %d\n",
1192 list_empty(&group->func[vf].pending), group->func[vf].num_pend_reqs);
1193 }
1194 }
1195
push_deleteing_req(struct mcast_group * group,int slave)1196 static int push_deleteing_req(struct mcast_group *group, int slave)
1197 {
1198 struct mcast_req *req;
1199 struct mcast_req *pend_req;
1200
1201 if (!group->func[slave].join_state)
1202 return 0;
1203
1204 req = kzalloc(sizeof *req, GFP_KERNEL);
1205 if (!req)
1206 return -ENOMEM;
1207
1208 if (!list_empty(&group->func[slave].pending)) {
1209 pend_req = list_entry(group->func[slave].pending.prev, struct mcast_req, group_list);
1210 if (pend_req->clean) {
1211 kfree(req);
1212 return 0;
1213 }
1214 }
1215
1216 req->clean = 1;
1217 req->func = slave;
1218 req->group = group;
1219 ++group->func[slave].num_pend_reqs;
1220 build_leave_mad(req);
1221 queue_req(req);
1222 return 0;
1223 }
1224
clean_vf_mcast(struct mlx4_ib_demux_ctx * ctx,int slave)1225 void clean_vf_mcast(struct mlx4_ib_demux_ctx *ctx, int slave)
1226 {
1227 struct mcast_group *group;
1228 struct rb_node *p;
1229
1230 mutex_lock(&ctx->mcg_table_lock);
1231 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) {
1232 group = rb_entry(p, struct mcast_group, node);
1233 mutex_lock(&group->lock);
1234 if (atomic_read(&group->refcount)) {
1235 /* clear pending requests of this VF */
1236 clear_pending_reqs(group, slave);
1237 push_deleteing_req(group, slave);
1238 }
1239 mutex_unlock(&group->lock);
1240 }
1241 mutex_unlock(&ctx->mcg_table_lock);
1242 }
1243
1244
mlx4_ib_mcg_init(void)1245 int mlx4_ib_mcg_init(void)
1246 {
1247 clean_wq = alloc_ordered_workqueue("mlx4_ib_mcg", WQ_MEM_RECLAIM);
1248 if (!clean_wq)
1249 return -ENOMEM;
1250
1251 return 0;
1252 }
1253
mlx4_ib_mcg_destroy(void)1254 void mlx4_ib_mcg_destroy(void)
1255 {
1256 destroy_workqueue(clean_wq);
1257 }
1258