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) 146 147 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 } 161 162 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 } 182 183 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 } 208 209 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 } 227 228 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 } 251 252 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 } 278 279 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 } 317 318 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 } 351 352 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 } 382 383 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 */ 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 } 473 474 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 } 482 483 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 } 494 495 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 } 510 511 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 } 523 524 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 } 538 539 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 } 583 584 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 } 604 605 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 } 641 642 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 } 745 746 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); 809 810 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 } 868 869 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 } 881 882 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 } 930 931 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 case IB_SA_METHOD_DELETE: 948 req = kzalloc(sizeof *req, GFP_KERNEL); 949 if (!req) 950 return -ENOMEM; 951 952 req->func = slave; 953 req->sa_mad = *sa_mad; 954 955 mutex_lock(&ctx->mcg_table_lock); 956 group = acquire_group(ctx, &rec->mgid, may_create); 957 mutex_unlock(&ctx->mcg_table_lock); 958 if (IS_ERR(group)) { 959 kfree(req); 960 return PTR_ERR(group); 961 } 962 mutex_lock(&group->lock); 963 if (group->func[slave].num_pend_reqs > MAX_PEND_REQS_PER_FUNC) { 964 mutex_unlock(&group->lock); 965 mcg_debug_group(group, "Port %d, Func %d has too many pending requests (%d), dropping\n", 966 port, slave, MAX_PEND_REQS_PER_FUNC); 967 release_group(group, 0); 968 kfree(req); 969 return -ENOMEM; 970 } 971 ++group->func[slave].num_pend_reqs; 972 req->group = group; 973 queue_req(req); 974 mutex_unlock(&group->lock); 975 release_group(group, 0); 976 return 1; /* consumed */ 977 case IB_SA_METHOD_GET_TABLE: 978 case IB_MGMT_METHOD_GET_RESP: 979 case IB_SA_METHOD_GET_TABLE_RESP: 980 case IB_SA_METHOD_DELETE_RESP: 981 return 0; /* not consumed, pass-through */ 982 default: 983 mcg_warn("In multiplex, port %d, func %d: unexpected MCMember method: 0x%x, dropping\n", 984 port, slave, sa_mad->mad_hdr.method); 985 return 1; /* consumed */ 986 } 987 } 988 989 static ssize_t sysfs_show_group(struct device *dev, 990 struct device_attribute *attr, char *buf) 991 { 992 struct mcast_group *group = 993 container_of(attr, struct mcast_group, dentry); 994 struct mcast_req *req = NULL; 995 char pending_str[40]; 996 char state_str[40]; 997 ssize_t len = 0; 998 int f; 999 1000 if (group->state == MCAST_IDLE) 1001 sprintf(state_str, "%s", get_state_string(group->state)); 1002 else 1003 sprintf(state_str, "%s(TID=0x%llx)", 1004 get_state_string(group->state), 1005 be64_to_cpu(group->last_req_tid)); 1006 if (list_empty(&group->pending_list)) { 1007 sprintf(pending_str, "No"); 1008 } else { 1009 req = list_first_entry(&group->pending_list, struct mcast_req, group_list); 1010 sprintf(pending_str, "Yes(TID=0x%llx)", 1011 be64_to_cpu(req->sa_mad.mad_hdr.tid)); 1012 } 1013 len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s ", 1014 group->rec.scope_join_state & 0xf, 1015 group->members[2], group->members[1], group->members[0], 1016 atomic_read(&group->refcount), 1017 pending_str, 1018 state_str); 1019 for (f = 0; f < MAX_VFS; ++f) 1020 if (group->func[f].state == MCAST_MEMBER) 1021 len += sprintf(buf + len, "%d[%1x] ", 1022 f, group->func[f].join_state); 1023 1024 len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x " 1025 "%4x %4x %2x %2x)\n", 1026 be16_to_cpu(group->rec.pkey), 1027 be32_to_cpu(group->rec.qkey), 1028 (group->rec.mtusel_mtu & 0xc0) >> 6, 1029 group->rec.mtusel_mtu & 0x3f, 1030 group->rec.tclass, 1031 (group->rec.ratesel_rate & 0xc0) >> 6, 1032 group->rec.ratesel_rate & 0x3f, 1033 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28, 1034 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8, 1035 be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff, 1036 group->rec.proxy_join); 1037 1038 return len; 1039 } 1040 1041 int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx) 1042 { 1043 char name[20]; 1044 1045 atomic_set(&ctx->tid, 0); 1046 sprintf(name, "mlx4_ib_mcg%d", ctx->port); 1047 ctx->mcg_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM); 1048 if (!ctx->mcg_wq) 1049 return -ENOMEM; 1050 1051 mutex_init(&ctx->mcg_table_lock); 1052 ctx->mcg_table = RB_ROOT; 1053 INIT_LIST_HEAD(&ctx->mcg_mgid0_list); 1054 ctx->flushing = 0; 1055 1056 return 0; 1057 } 1058 1059 static void force_clean_group(struct mcast_group *group) 1060 { 1061 struct mcast_req *req, *tmp 1062 ; 1063 list_for_each_entry_safe(req, tmp, &group->pending_list, group_list) { 1064 list_del(&req->group_list); 1065 kfree(req); 1066 } 1067 del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr); 1068 rb_erase(&group->node, &group->demux->mcg_table); 1069 kfree(group); 1070 } 1071 1072 static void _mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) 1073 { 1074 int i; 1075 struct rb_node *p; 1076 struct mcast_group *group; 1077 unsigned long end; 1078 int count; 1079 1080 for (i = 0; i < MAX_VFS; ++i) 1081 clean_vf_mcast(ctx, i); 1082 1083 end = jiffies + msecs_to_jiffies(MAD_TIMEOUT_MS + 3000); 1084 do { 1085 count = 0; 1086 mutex_lock(&ctx->mcg_table_lock); 1087 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) 1088 ++count; 1089 mutex_unlock(&ctx->mcg_table_lock); 1090 if (!count) 1091 break; 1092 1093 usleep_range(1000, 2000); 1094 } while (time_after(end, jiffies)); 1095 1096 flush_workqueue(ctx->mcg_wq); 1097 if (destroy_wq) 1098 destroy_workqueue(ctx->mcg_wq); 1099 1100 mutex_lock(&ctx->mcg_table_lock); 1101 while ((p = rb_first(&ctx->mcg_table)) != NULL) { 1102 group = rb_entry(p, struct mcast_group, node); 1103 if (atomic_read(&group->refcount)) 1104 mcg_debug_group(group, "group refcount %d!!! (pointer %p)\n", 1105 atomic_read(&group->refcount), group); 1106 1107 force_clean_group(group); 1108 } 1109 mutex_unlock(&ctx->mcg_table_lock); 1110 } 1111 1112 struct clean_work { 1113 struct work_struct work; 1114 struct mlx4_ib_demux_ctx *ctx; 1115 int destroy_wq; 1116 }; 1117 1118 static void mcg_clean_task(struct work_struct *work) 1119 { 1120 struct clean_work *cw = container_of(work, struct clean_work, work); 1121 1122 _mlx4_ib_mcg_port_cleanup(cw->ctx, cw->destroy_wq); 1123 cw->ctx->flushing = 0; 1124 kfree(cw); 1125 } 1126 1127 void mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) 1128 { 1129 struct clean_work *work; 1130 1131 if (ctx->flushing) 1132 return; 1133 1134 ctx->flushing = 1; 1135 1136 if (destroy_wq) { 1137 _mlx4_ib_mcg_port_cleanup(ctx, destroy_wq); 1138 ctx->flushing = 0; 1139 return; 1140 } 1141 1142 work = kmalloc(sizeof *work, GFP_KERNEL); 1143 if (!work) { 1144 ctx->flushing = 0; 1145 return; 1146 } 1147 1148 work->ctx = ctx; 1149 work->destroy_wq = destroy_wq; 1150 INIT_WORK(&work->work, mcg_clean_task); 1151 queue_work(clean_wq, &work->work); 1152 } 1153 1154 static void build_leave_mad(struct mcast_req *req) 1155 { 1156 struct ib_sa_mad *mad = &req->sa_mad; 1157 1158 mad->mad_hdr.method = IB_SA_METHOD_DELETE; 1159 } 1160 1161 1162 static void clear_pending_reqs(struct mcast_group *group, int vf) 1163 { 1164 struct mcast_req *req, *tmp, *group_first = NULL; 1165 int clear; 1166 int pend = 0; 1167 1168 if (!list_empty(&group->pending_list)) 1169 group_first = list_first_entry(&group->pending_list, struct mcast_req, group_list); 1170 1171 list_for_each_entry_safe(req, tmp, &group->func[vf].pending, func_list) { 1172 clear = 1; 1173 if (group_first == req && 1174 (group->state == MCAST_JOIN_SENT || 1175 group->state == MCAST_LEAVE_SENT)) { 1176 clear = cancel_delayed_work(&group->timeout_work); 1177 pend = !clear; 1178 group->state = MCAST_IDLE; 1179 } 1180 if (clear) { 1181 --group->func[vf].num_pend_reqs; 1182 list_del(&req->group_list); 1183 list_del(&req->func_list); 1184 kfree(req); 1185 atomic_dec(&group->refcount); 1186 } 1187 } 1188 1189 if (!pend && (!list_empty(&group->func[vf].pending) || group->func[vf].num_pend_reqs)) { 1190 mcg_warn_group(group, "DRIVER BUG: list_empty %d, num_pend_reqs %d\n", 1191 list_empty(&group->func[vf].pending), group->func[vf].num_pend_reqs); 1192 } 1193 } 1194 1195 static int push_deleteing_req(struct mcast_group *group, int slave) 1196 { 1197 struct mcast_req *req; 1198 struct mcast_req *pend_req; 1199 1200 if (!group->func[slave].join_state) 1201 return 0; 1202 1203 req = kzalloc(sizeof *req, GFP_KERNEL); 1204 if (!req) 1205 return -ENOMEM; 1206 1207 if (!list_empty(&group->func[slave].pending)) { 1208 pend_req = list_entry(group->func[slave].pending.prev, struct mcast_req, group_list); 1209 if (pend_req->clean) { 1210 kfree(req); 1211 return 0; 1212 } 1213 } 1214 1215 req->clean = 1; 1216 req->func = slave; 1217 req->group = group; 1218 ++group->func[slave].num_pend_reqs; 1219 build_leave_mad(req); 1220 queue_req(req); 1221 return 0; 1222 } 1223 1224 void clean_vf_mcast(struct mlx4_ib_demux_ctx *ctx, int slave) 1225 { 1226 struct mcast_group *group; 1227 struct rb_node *p; 1228 1229 mutex_lock(&ctx->mcg_table_lock); 1230 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) { 1231 group = rb_entry(p, struct mcast_group, node); 1232 mutex_lock(&group->lock); 1233 if (atomic_read(&group->refcount)) { 1234 /* clear pending requests of this VF */ 1235 clear_pending_reqs(group, slave); 1236 push_deleteing_req(group, slave); 1237 } 1238 mutex_unlock(&group->lock); 1239 } 1240 mutex_unlock(&ctx->mcg_table_lock); 1241 } 1242 1243 1244 int mlx4_ib_mcg_init(void) 1245 { 1246 clean_wq = alloc_ordered_workqueue("mlx4_ib_mcg", WQ_MEM_RECLAIM); 1247 if (!clean_wq) 1248 return -ENOMEM; 1249 1250 return 0; 1251 } 1252 1253 void mlx4_ib_mcg_destroy(void) 1254 { 1255 destroy_workqueue(clean_wq); 1256 } 1257