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), 219 ctx->port, IB_QPT_GSI, 0, 1, IB_QP1_QKEY, 220 &ah_attr, NULL, mad); 221 } 222 223 static int send_mad_to_slave(int slave, struct mlx4_ib_demux_ctx *ctx, 224 struct ib_mad *mad) 225 { 226 struct mlx4_ib_dev *dev = ctx->dev; 227 struct ib_mad_agent *agent = dev->send_agent[ctx->port - 1][1]; 228 struct ib_wc wc; 229 struct ib_ah_attr ah_attr; 230 231 /* Our agent might not yet be registered when mads start to arrive */ 232 if (!agent) 233 return -EAGAIN; 234 235 ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr); 236 237 if (ib_find_cached_pkey(&dev->ib_dev, ctx->port, IB_DEFAULT_PKEY_FULL, &wc.pkey_index)) 238 return -EINVAL; 239 wc.sl = 0; 240 wc.dlid_path_bits = 0; 241 wc.port_num = ctx->port; 242 wc.slid = ah_attr.dlid; /* opensm lid */ 243 wc.src_qp = 1; 244 return mlx4_ib_send_to_slave(dev, slave, ctx->port, IB_QPT_GSI, &wc, NULL, mad); 245 } 246 247 static int send_join_to_wire(struct mcast_group *group, struct ib_sa_mad *sa_mad) 248 { 249 struct ib_sa_mad mad; 250 struct ib_sa_mcmember_data *sa_mad_data = (struct ib_sa_mcmember_data *)&mad.data; 251 int ret; 252 253 /* we rely on a mad request as arrived from a VF */ 254 memcpy(&mad, sa_mad, sizeof mad); 255 256 /* fix port GID to be the real one (slave 0) */ 257 sa_mad_data->port_gid.global.interface_id = group->demux->guid_cache[0]; 258 259 /* assign our own TID */ 260 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux); 261 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */ 262 263 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad); 264 /* set timeout handler */ 265 if (!ret) { 266 /* calls mlx4_ib_mcg_timeout_handler */ 267 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work, 268 msecs_to_jiffies(MAD_TIMEOUT_MS)); 269 } 270 271 return ret; 272 } 273 274 static int send_leave_to_wire(struct mcast_group *group, u8 join_state) 275 { 276 struct ib_sa_mad mad; 277 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data; 278 int ret; 279 280 memset(&mad, 0, sizeof mad); 281 mad.mad_hdr.base_version = 1; 282 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 283 mad.mad_hdr.class_version = 2; 284 mad.mad_hdr.method = IB_SA_METHOD_DELETE; 285 mad.mad_hdr.status = cpu_to_be16(0); 286 mad.mad_hdr.class_specific = cpu_to_be16(0); 287 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux); 288 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */ 289 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 290 mad.mad_hdr.attr_mod = cpu_to_be32(0); 291 mad.sa_hdr.sm_key = 0x0; 292 mad.sa_hdr.attr_offset = cpu_to_be16(7); 293 mad.sa_hdr.comp_mask = IB_SA_MCMEMBER_REC_MGID | 294 IB_SA_MCMEMBER_REC_PORT_GID | IB_SA_MCMEMBER_REC_JOIN_STATE; 295 296 *sa_data = group->rec; 297 sa_data->scope_join_state = join_state; 298 299 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad); 300 if (ret) 301 group->state = MCAST_IDLE; 302 303 /* set timeout handler */ 304 if (!ret) { 305 /* calls mlx4_ib_mcg_timeout_handler */ 306 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work, 307 msecs_to_jiffies(MAD_TIMEOUT_MS)); 308 } 309 310 return ret; 311 } 312 313 static int send_reply_to_slave(int slave, struct mcast_group *group, 314 struct ib_sa_mad *req_sa_mad, u16 status) 315 { 316 struct ib_sa_mad mad; 317 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data; 318 struct ib_sa_mcmember_data *req_sa_data = (struct ib_sa_mcmember_data *)&req_sa_mad->data; 319 int ret; 320 321 memset(&mad, 0, sizeof mad); 322 mad.mad_hdr.base_version = 1; 323 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 324 mad.mad_hdr.class_version = 2; 325 mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP; 326 mad.mad_hdr.status = cpu_to_be16(status); 327 mad.mad_hdr.class_specific = cpu_to_be16(0); 328 mad.mad_hdr.tid = req_sa_mad->mad_hdr.tid; 329 *(u8 *)&mad.mad_hdr.tid = 0; /* resetting tid to 0 */ 330 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 331 mad.mad_hdr.attr_mod = cpu_to_be32(0); 332 mad.sa_hdr.sm_key = req_sa_mad->sa_hdr.sm_key; 333 mad.sa_hdr.attr_offset = cpu_to_be16(7); 334 mad.sa_hdr.comp_mask = 0; /* ignored on responses, see IBTA spec */ 335 336 *sa_data = group->rec; 337 338 /* reconstruct VF's requested join_state and port_gid */ 339 sa_data->scope_join_state &= 0xf0; 340 sa_data->scope_join_state |= (group->func[slave].join_state & 0x0f); 341 memcpy(&sa_data->port_gid, &req_sa_data->port_gid, sizeof req_sa_data->port_gid); 342 343 ret = send_mad_to_slave(slave, group->demux, (struct ib_mad *)&mad); 344 return ret; 345 } 346 347 static int check_selector(ib_sa_comp_mask comp_mask, 348 ib_sa_comp_mask selector_mask, 349 ib_sa_comp_mask value_mask, 350 u8 src_value, u8 dst_value) 351 { 352 int err; 353 u8 selector = dst_value >> 6; 354 dst_value &= 0x3f; 355 src_value &= 0x3f; 356 357 if (!(comp_mask & selector_mask) || !(comp_mask & value_mask)) 358 return 0; 359 360 switch (selector) { 361 case IB_SA_GT: 362 err = (src_value <= dst_value); 363 break; 364 case IB_SA_LT: 365 err = (src_value >= dst_value); 366 break; 367 case IB_SA_EQ: 368 err = (src_value != dst_value); 369 break; 370 default: 371 err = 0; 372 break; 373 } 374 375 return err; 376 } 377 378 static u16 cmp_rec(struct ib_sa_mcmember_data *src, 379 struct ib_sa_mcmember_data *dst, ib_sa_comp_mask comp_mask) 380 { 381 /* src is group record, dst is request record */ 382 /* MGID must already match */ 383 /* Port_GID we always replace to our Port_GID, so it is a match */ 384 385 #define MAD_STATUS_REQ_INVALID 0x0200 386 if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey) 387 return MAD_STATUS_REQ_INVALID; 388 if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid) 389 return MAD_STATUS_REQ_INVALID; 390 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR, 391 IB_SA_MCMEMBER_REC_MTU, 392 src->mtusel_mtu, dst->mtusel_mtu)) 393 return MAD_STATUS_REQ_INVALID; 394 if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS && 395 src->tclass != dst->tclass) 396 return MAD_STATUS_REQ_INVALID; 397 if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey) 398 return MAD_STATUS_REQ_INVALID; 399 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR, 400 IB_SA_MCMEMBER_REC_RATE, 401 src->ratesel_rate, dst->ratesel_rate)) 402 return MAD_STATUS_REQ_INVALID; 403 if (check_selector(comp_mask, 404 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR, 405 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME, 406 src->lifetmsel_lifetm, dst->lifetmsel_lifetm)) 407 return MAD_STATUS_REQ_INVALID; 408 if (comp_mask & IB_SA_MCMEMBER_REC_SL && 409 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0xf0000000) != 410 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0xf0000000)) 411 return MAD_STATUS_REQ_INVALID; 412 if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL && 413 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x0fffff00) != 414 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x0fffff00)) 415 return MAD_STATUS_REQ_INVALID; 416 if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT && 417 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x000000ff) != 418 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x000000ff)) 419 return MAD_STATUS_REQ_INVALID; 420 if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && 421 (src->scope_join_state & 0xf0) != 422 (dst->scope_join_state & 0xf0)) 423 return MAD_STATUS_REQ_INVALID; 424 425 /* join_state checked separately, proxy_join ignored */ 426 427 return 0; 428 } 429 430 /* release group, return 1 if this was last release and group is destroyed 431 * timout work is canceled sync */ 432 static int release_group(struct mcast_group *group, int from_timeout_handler) 433 { 434 struct mlx4_ib_demux_ctx *ctx = group->demux; 435 int nzgroup; 436 437 mutex_lock(&ctx->mcg_table_lock); 438 mutex_lock(&group->lock); 439 if (atomic_dec_and_test(&group->refcount)) { 440 if (!from_timeout_handler) { 441 if (group->state != MCAST_IDLE && 442 !cancel_delayed_work(&group->timeout_work)) { 443 atomic_inc(&group->refcount); 444 mutex_unlock(&group->lock); 445 mutex_unlock(&ctx->mcg_table_lock); 446 return 0; 447 } 448 } 449 450 nzgroup = memcmp(&group->rec.mgid, &mgid0, sizeof mgid0); 451 if (nzgroup) 452 del_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); 453 if (!list_empty(&group->pending_list)) 454 mcg_warn_group(group, "releasing a group with non empty pending list\n"); 455 if (nzgroup) 456 rb_erase(&group->node, &ctx->mcg_table); 457 list_del_init(&group->mgid0_list); 458 mutex_unlock(&group->lock); 459 mutex_unlock(&ctx->mcg_table_lock); 460 kfree(group); 461 return 1; 462 } else { 463 mutex_unlock(&group->lock); 464 mutex_unlock(&ctx->mcg_table_lock); 465 } 466 return 0; 467 } 468 469 static void adjust_membership(struct mcast_group *group, u8 join_state, int inc) 470 { 471 int i; 472 473 for (i = 0; i < 3; i++, join_state >>= 1) 474 if (join_state & 0x1) 475 group->members[i] += inc; 476 } 477 478 static u8 get_leave_state(struct mcast_group *group) 479 { 480 u8 leave_state = 0; 481 int i; 482 483 for (i = 0; i < 3; i++) 484 if (!group->members[i]) 485 leave_state |= (1 << i); 486 487 return leave_state & (group->rec.scope_join_state & 7); 488 } 489 490 static int join_group(struct mcast_group *group, int slave, u8 join_mask) 491 { 492 int ret = 0; 493 u8 join_state; 494 495 /* remove bits that slave is already member of, and adjust */ 496 join_state = join_mask & (~group->func[slave].join_state); 497 adjust_membership(group, join_state, 1); 498 group->func[slave].join_state |= join_state; 499 if (group->func[slave].state != MCAST_MEMBER && join_state) { 500 group->func[slave].state = MCAST_MEMBER; 501 ret = 1; 502 } 503 return ret; 504 } 505 506 static int leave_group(struct mcast_group *group, int slave, u8 leave_state) 507 { 508 int ret = 0; 509 510 adjust_membership(group, leave_state, -1); 511 group->func[slave].join_state &= ~leave_state; 512 if (!group->func[slave].join_state) { 513 group->func[slave].state = MCAST_NOT_MEMBER; 514 ret = 1; 515 } 516 return ret; 517 } 518 519 static int check_leave(struct mcast_group *group, int slave, u8 leave_mask) 520 { 521 if (group->func[slave].state != MCAST_MEMBER) 522 return MAD_STATUS_REQ_INVALID; 523 524 /* make sure we're not deleting unset bits */ 525 if (~group->func[slave].join_state & leave_mask) 526 return MAD_STATUS_REQ_INVALID; 527 528 if (!leave_mask) 529 return MAD_STATUS_REQ_INVALID; 530 531 return 0; 532 } 533 534 static void mlx4_ib_mcg_timeout_handler(struct work_struct *work) 535 { 536 struct delayed_work *delay = to_delayed_work(work); 537 struct mcast_group *group; 538 struct mcast_req *req = NULL; 539 540 group = container_of(delay, typeof(*group), timeout_work); 541 542 mutex_lock(&group->lock); 543 if (group->state == MCAST_JOIN_SENT) { 544 if (!list_empty(&group->pending_list)) { 545 req = list_first_entry(&group->pending_list, struct mcast_req, group_list); 546 list_del(&req->group_list); 547 list_del(&req->func_list); 548 --group->func[req->func].num_pend_reqs; 549 mutex_unlock(&group->lock); 550 kfree(req); 551 if (memcmp(&group->rec.mgid, &mgid0, sizeof mgid0)) { 552 if (release_group(group, 1)) 553 return; 554 } else { 555 kfree(group); 556 return; 557 } 558 mutex_lock(&group->lock); 559 } else 560 mcg_warn_group(group, "DRIVER BUG\n"); 561 } else if (group->state == MCAST_LEAVE_SENT) { 562 if (group->rec.scope_join_state & 7) 563 group->rec.scope_join_state &= 0xf8; 564 group->state = MCAST_IDLE; 565 mutex_unlock(&group->lock); 566 if (release_group(group, 1)) 567 return; 568 mutex_lock(&group->lock); 569 } else 570 mcg_warn_group(group, "invalid state %s\n", get_state_string(group->state)); 571 group->state = MCAST_IDLE; 572 atomic_inc(&group->refcount); 573 if (!queue_work(group->demux->mcg_wq, &group->work)) 574 safe_atomic_dec(&group->refcount); 575 576 mutex_unlock(&group->lock); 577 } 578 579 static int handle_leave_req(struct mcast_group *group, u8 leave_mask, 580 struct mcast_req *req) 581 { 582 u16 status; 583 584 if (req->clean) 585 leave_mask = group->func[req->func].join_state; 586 587 status = check_leave(group, req->func, leave_mask); 588 if (!status) 589 leave_group(group, req->func, leave_mask); 590 591 if (!req->clean) 592 send_reply_to_slave(req->func, group, &req->sa_mad, status); 593 --group->func[req->func].num_pend_reqs; 594 list_del(&req->group_list); 595 list_del(&req->func_list); 596 kfree(req); 597 return 1; 598 } 599 600 static int handle_join_req(struct mcast_group *group, u8 join_mask, 601 struct mcast_req *req) 602 { 603 u8 group_join_state = group->rec.scope_join_state & 7; 604 int ref = 0; 605 u16 status; 606 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data; 607 608 if (join_mask == (group_join_state & join_mask)) { 609 /* port's membership need not change */ 610 status = cmp_rec(&group->rec, sa_data, req->sa_mad.sa_hdr.comp_mask); 611 if (!status) 612 join_group(group, req->func, join_mask); 613 614 --group->func[req->func].num_pend_reqs; 615 send_reply_to_slave(req->func, group, &req->sa_mad, status); 616 list_del(&req->group_list); 617 list_del(&req->func_list); 618 kfree(req); 619 ++ref; 620 } else { 621 /* port's membership needs to be updated */ 622 group->prev_state = group->state; 623 if (send_join_to_wire(group, &req->sa_mad)) { 624 --group->func[req->func].num_pend_reqs; 625 list_del(&req->group_list); 626 list_del(&req->func_list); 627 kfree(req); 628 ref = 1; 629 group->state = group->prev_state; 630 } else 631 group->state = MCAST_JOIN_SENT; 632 } 633 634 return ref; 635 } 636 637 static void mlx4_ib_mcg_work_handler(struct work_struct *work) 638 { 639 struct mcast_group *group; 640 struct mcast_req *req = NULL; 641 struct ib_sa_mcmember_data *sa_data; 642 u8 req_join_state; 643 int rc = 1; /* release_count - this is for the scheduled work */ 644 u16 status; 645 u8 method; 646 647 group = container_of(work, typeof(*group), work); 648 649 mutex_lock(&group->lock); 650 651 /* First, let's see if a response from SM is waiting regarding this group. 652 * If so, we need to update the group's REC. If this is a bad response, we 653 * may need to send a bad response to a VF waiting for it. If VF is waiting 654 * and this is a good response, the VF will be answered later in this func. */ 655 if (group->state == MCAST_RESP_READY) { 656 /* cancels mlx4_ib_mcg_timeout_handler */ 657 cancel_delayed_work(&group->timeout_work); 658 status = be16_to_cpu(group->response_sa_mad.mad_hdr.status); 659 method = group->response_sa_mad.mad_hdr.method; 660 if (group->last_req_tid != group->response_sa_mad.mad_hdr.tid) { 661 mcg_warn_group(group, "Got MAD response to existing MGID but wrong TID, dropping. Resp TID=%llx, group TID=%llx\n", 662 be64_to_cpu(group->response_sa_mad.mad_hdr.tid), 663 be64_to_cpu(group->last_req_tid)); 664 group->state = group->prev_state; 665 goto process_requests; 666 } 667 if (status) { 668 if (!list_empty(&group->pending_list)) 669 req = list_first_entry(&group->pending_list, 670 struct mcast_req, group_list); 671 if ((method == IB_MGMT_METHOD_GET_RESP)) { 672 if (req) { 673 send_reply_to_slave(req->func, group, &req->sa_mad, status); 674 --group->func[req->func].num_pend_reqs; 675 list_del(&req->group_list); 676 list_del(&req->func_list); 677 kfree(req); 678 ++rc; 679 } else 680 mcg_warn_group(group, "no request for failed join\n"); 681 } else if (method == IB_SA_METHOD_DELETE_RESP && group->demux->flushing) 682 ++rc; 683 } else { 684 u8 resp_join_state; 685 u8 cur_join_state; 686 687 resp_join_state = ((struct ib_sa_mcmember_data *) 688 group->response_sa_mad.data)->scope_join_state & 7; 689 cur_join_state = group->rec.scope_join_state & 7; 690 691 if (method == IB_MGMT_METHOD_GET_RESP) { 692 /* successfull join */ 693 if (!cur_join_state && resp_join_state) 694 --rc; 695 } else if (!resp_join_state) 696 ++rc; 697 memcpy(&group->rec, group->response_sa_mad.data, sizeof group->rec); 698 } 699 group->state = MCAST_IDLE; 700 } 701 702 process_requests: 703 /* We should now go over pending join/leave requests, as long as we are idle. */ 704 while (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) { 705 req = list_first_entry(&group->pending_list, struct mcast_req, 706 group_list); 707 sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data; 708 req_join_state = sa_data->scope_join_state & 0x7; 709 710 /* For a leave request, we will immediately answer the VF, and 711 * update our internal counters. The actual leave will be sent 712 * to SM later, if at all needed. We dequeue the request now. */ 713 if (req->sa_mad.mad_hdr.method == IB_SA_METHOD_DELETE) 714 rc += handle_leave_req(group, req_join_state, req); 715 else 716 rc += handle_join_req(group, req_join_state, req); 717 } 718 719 /* Handle leaves */ 720 if (group->state == MCAST_IDLE) { 721 req_join_state = get_leave_state(group); 722 if (req_join_state) { 723 group->rec.scope_join_state &= ~req_join_state; 724 group->prev_state = group->state; 725 if (send_leave_to_wire(group, req_join_state)) { 726 group->state = group->prev_state; 727 ++rc; 728 } else 729 group->state = MCAST_LEAVE_SENT; 730 } 731 } 732 733 if (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) 734 goto process_requests; 735 mutex_unlock(&group->lock); 736 737 while (rc--) 738 release_group(group, 0); 739 } 740 741 static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx *ctx, 742 __be64 tid, 743 union ib_gid *new_mgid) 744 { 745 struct mcast_group *group = NULL, *cur_group; 746 struct mcast_req *req; 747 struct list_head *pos; 748 struct list_head *n; 749 750 mutex_lock(&ctx->mcg_table_lock); 751 list_for_each_safe(pos, n, &ctx->mcg_mgid0_list) { 752 group = list_entry(pos, struct mcast_group, mgid0_list); 753 mutex_lock(&group->lock); 754 if (group->last_req_tid == tid) { 755 if (memcmp(new_mgid, &mgid0, sizeof mgid0)) { 756 group->rec.mgid = *new_mgid; 757 sprintf(group->name, "%016llx%016llx", 758 be64_to_cpu(group->rec.mgid.global.subnet_prefix), 759 be64_to_cpu(group->rec.mgid.global.interface_id)); 760 list_del_init(&group->mgid0_list); 761 cur_group = mcast_insert(ctx, group); 762 if (cur_group) { 763 /* A race between our code and SM. Silently cleaning the new one */ 764 req = list_first_entry(&group->pending_list, 765 struct mcast_req, group_list); 766 --group->func[req->func].num_pend_reqs; 767 list_del(&req->group_list); 768 list_del(&req->func_list); 769 kfree(req); 770 mutex_unlock(&group->lock); 771 mutex_unlock(&ctx->mcg_table_lock); 772 release_group(group, 0); 773 return NULL; 774 } 775 776 atomic_inc(&group->refcount); 777 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); 778 mutex_unlock(&group->lock); 779 mutex_unlock(&ctx->mcg_table_lock); 780 return group; 781 } else { 782 struct mcast_req *tmp1, *tmp2; 783 784 list_del(&group->mgid0_list); 785 if (!list_empty(&group->pending_list) && group->state != MCAST_IDLE) 786 cancel_delayed_work_sync(&group->timeout_work); 787 788 list_for_each_entry_safe(tmp1, tmp2, &group->pending_list, group_list) { 789 list_del(&tmp1->group_list); 790 kfree(tmp1); 791 } 792 mutex_unlock(&group->lock); 793 mutex_unlock(&ctx->mcg_table_lock); 794 kfree(group); 795 return NULL; 796 } 797 } 798 mutex_unlock(&group->lock); 799 } 800 mutex_unlock(&ctx->mcg_table_lock); 801 802 return NULL; 803 } 804 805 static ssize_t sysfs_show_group(struct device *dev, 806 struct device_attribute *attr, char *buf); 807 808 static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx, 809 union ib_gid *mgid, int create, 810 gfp_t gfp_mask) 811 { 812 struct mcast_group *group, *cur_group; 813 int is_mgid0; 814 int i; 815 816 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0); 817 if (!is_mgid0) { 818 group = mcast_find(ctx, mgid); 819 if (group) 820 goto found; 821 } 822 823 if (!create) 824 return ERR_PTR(-ENOENT); 825 826 group = kzalloc(sizeof *group, gfp_mask); 827 if (!group) 828 return ERR_PTR(-ENOMEM); 829 830 group->demux = ctx; 831 group->rec.mgid = *mgid; 832 INIT_LIST_HEAD(&group->pending_list); 833 INIT_LIST_HEAD(&group->mgid0_list); 834 for (i = 0; i < MAX_VFS; ++i) 835 INIT_LIST_HEAD(&group->func[i].pending); 836 INIT_WORK(&group->work, mlx4_ib_mcg_work_handler); 837 INIT_DELAYED_WORK(&group->timeout_work, mlx4_ib_mcg_timeout_handler); 838 mutex_init(&group->lock); 839 sprintf(group->name, "%016llx%016llx", 840 be64_to_cpu(group->rec.mgid.global.subnet_prefix), 841 be64_to_cpu(group->rec.mgid.global.interface_id)); 842 sysfs_attr_init(&group->dentry.attr); 843 group->dentry.show = sysfs_show_group; 844 group->dentry.store = NULL; 845 group->dentry.attr.name = group->name; 846 group->dentry.attr.mode = 0400; 847 group->state = MCAST_IDLE; 848 849 if (is_mgid0) { 850 list_add(&group->mgid0_list, &ctx->mcg_mgid0_list); 851 goto found; 852 } 853 854 cur_group = mcast_insert(ctx, group); 855 if (cur_group) { 856 mcg_warn("group just showed up %s - confused\n", cur_group->name); 857 kfree(group); 858 return ERR_PTR(-EINVAL); 859 } 860 861 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); 862 863 found: 864 atomic_inc(&group->refcount); 865 return group; 866 } 867 868 static void queue_req(struct mcast_req *req) 869 { 870 struct mcast_group *group = req->group; 871 872 atomic_inc(&group->refcount); /* for the request */ 873 atomic_inc(&group->refcount); /* for scheduling the work */ 874 list_add_tail(&req->group_list, &group->pending_list); 875 list_add_tail(&req->func_list, &group->func[req->func].pending); 876 /* calls mlx4_ib_mcg_work_handler */ 877 if (!queue_work(group->demux->mcg_wq, &group->work)) 878 safe_atomic_dec(&group->refcount); 879 } 880 881 int mlx4_ib_mcg_demux_handler(struct ib_device *ibdev, int port, int slave, 882 struct ib_sa_mad *mad) 883 { 884 struct mlx4_ib_dev *dev = to_mdev(ibdev); 885 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)mad->data; 886 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1]; 887 struct mcast_group *group; 888 889 switch (mad->mad_hdr.method) { 890 case IB_MGMT_METHOD_GET_RESP: 891 case IB_SA_METHOD_DELETE_RESP: 892 mutex_lock(&ctx->mcg_table_lock); 893 group = acquire_group(ctx, &rec->mgid, 0, GFP_KERNEL); 894 mutex_unlock(&ctx->mcg_table_lock); 895 if (IS_ERR(group)) { 896 if (mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP) { 897 __be64 tid = mad->mad_hdr.tid; 898 *(u8 *)(&tid) = (u8)slave; /* in group we kept the modified TID */ 899 group = search_relocate_mgid0_group(ctx, tid, &rec->mgid); 900 } else 901 group = NULL; 902 } 903 904 if (!group) 905 return 1; 906 907 mutex_lock(&group->lock); 908 group->response_sa_mad = *mad; 909 group->prev_state = group->state; 910 group->state = MCAST_RESP_READY; 911 /* calls mlx4_ib_mcg_work_handler */ 912 atomic_inc(&group->refcount); 913 if (!queue_work(ctx->mcg_wq, &group->work)) 914 safe_atomic_dec(&group->refcount); 915 mutex_unlock(&group->lock); 916 release_group(group, 0); 917 return 1; /* consumed */ 918 case IB_MGMT_METHOD_SET: 919 case IB_SA_METHOD_GET_TABLE: 920 case IB_SA_METHOD_GET_TABLE_RESP: 921 case IB_SA_METHOD_DELETE: 922 return 0; /* not consumed, pass-through to guest over tunnel */ 923 default: 924 mcg_warn("In demux, port %d: unexpected MCMember method: 0x%x, dropping\n", 925 port, mad->mad_hdr.method); 926 return 1; /* consumed */ 927 } 928 } 929 930 int mlx4_ib_mcg_multiplex_handler(struct ib_device *ibdev, int port, 931 int slave, struct ib_sa_mad *sa_mad) 932 { 933 struct mlx4_ib_dev *dev = to_mdev(ibdev); 934 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)sa_mad->data; 935 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1]; 936 struct mcast_group *group; 937 struct mcast_req *req; 938 int may_create = 0; 939 940 if (ctx->flushing) 941 return -EAGAIN; 942 943 switch (sa_mad->mad_hdr.method) { 944 case IB_MGMT_METHOD_SET: 945 may_create = 1; 946 case IB_SA_METHOD_DELETE: 947 req = kzalloc(sizeof *req, GFP_KERNEL); 948 if (!req) 949 return -ENOMEM; 950 951 req->func = slave; 952 req->sa_mad = *sa_mad; 953 954 mutex_lock(&ctx->mcg_table_lock); 955 group = acquire_group(ctx, &rec->mgid, may_create, GFP_KERNEL); 956 mutex_unlock(&ctx->mcg_table_lock); 957 if (IS_ERR(group)) { 958 kfree(req); 959 return PTR_ERR(group); 960 } 961 mutex_lock(&group->lock); 962 if (group->func[slave].num_pend_reqs > MAX_PEND_REQS_PER_FUNC) { 963 mutex_unlock(&group->lock); 964 mcg_warn_group(group, "Port %d, Func %d has too many pending requests (%d), dropping\n", 965 port, slave, MAX_PEND_REQS_PER_FUNC); 966 release_group(group, 0); 967 kfree(req); 968 return -ENOMEM; 969 } 970 ++group->func[slave].num_pend_reqs; 971 req->group = group; 972 queue_req(req); 973 mutex_unlock(&group->lock); 974 release_group(group, 0); 975 return 1; /* consumed */ 976 case IB_SA_METHOD_GET_TABLE: 977 case IB_MGMT_METHOD_GET_RESP: 978 case IB_SA_METHOD_GET_TABLE_RESP: 979 case IB_SA_METHOD_DELETE_RESP: 980 return 0; /* not consumed, pass-through */ 981 default: 982 mcg_warn("In multiplex, port %d, func %d: unexpected MCMember method: 0x%x, dropping\n", 983 port, slave, sa_mad->mad_hdr.method); 984 return 1; /* consumed */ 985 } 986 } 987 988 static ssize_t sysfs_show_group(struct device *dev, 989 struct device_attribute *attr, char *buf) 990 { 991 struct mcast_group *group = 992 container_of(attr, struct mcast_group, dentry); 993 struct mcast_req *req = NULL; 994 char pending_str[40]; 995 char state_str[40]; 996 ssize_t len = 0; 997 int f; 998 999 if (group->state == MCAST_IDLE) 1000 sprintf(state_str, "%s", get_state_string(group->state)); 1001 else 1002 sprintf(state_str, "%s(TID=0x%llx)", 1003 get_state_string(group->state), 1004 be64_to_cpu(group->last_req_tid)); 1005 if (list_empty(&group->pending_list)) { 1006 sprintf(pending_str, "No"); 1007 } else { 1008 req = list_first_entry(&group->pending_list, struct mcast_req, group_list); 1009 sprintf(pending_str, "Yes(TID=0x%llx)", 1010 be64_to_cpu(req->sa_mad.mad_hdr.tid)); 1011 } 1012 len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s ", 1013 group->rec.scope_join_state & 0xf, 1014 group->members[2], group->members[1], group->members[0], 1015 atomic_read(&group->refcount), 1016 pending_str, 1017 state_str); 1018 for (f = 0; f < MAX_VFS; ++f) 1019 if (group->func[f].state == MCAST_MEMBER) 1020 len += sprintf(buf + len, "%d[%1x] ", 1021 f, group->func[f].join_state); 1022 1023 len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x " 1024 "%4x %4x %2x %2x)\n", 1025 be16_to_cpu(group->rec.pkey), 1026 be32_to_cpu(group->rec.qkey), 1027 (group->rec.mtusel_mtu & 0xc0) >> 6, 1028 group->rec.mtusel_mtu & 0x3f, 1029 group->rec.tclass, 1030 (group->rec.ratesel_rate & 0xc0) >> 6, 1031 group->rec.ratesel_rate & 0x3f, 1032 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28, 1033 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8, 1034 be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff, 1035 group->rec.proxy_join); 1036 1037 return len; 1038 } 1039 1040 int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx) 1041 { 1042 char name[20]; 1043 1044 atomic_set(&ctx->tid, 0); 1045 sprintf(name, "mlx4_ib_mcg%d", ctx->port); 1046 ctx->mcg_wq = create_singlethread_workqueue(name); 1047 if (!ctx->mcg_wq) 1048 return -ENOMEM; 1049 1050 mutex_init(&ctx->mcg_table_lock); 1051 ctx->mcg_table = RB_ROOT; 1052 INIT_LIST_HEAD(&ctx->mcg_mgid0_list); 1053 ctx->flushing = 0; 1054 1055 return 0; 1056 } 1057 1058 static void force_clean_group(struct mcast_group *group) 1059 { 1060 struct mcast_req *req, *tmp 1061 ; 1062 list_for_each_entry_safe(req, tmp, &group->pending_list, group_list) { 1063 list_del(&req->group_list); 1064 kfree(req); 1065 } 1066 del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr); 1067 rb_erase(&group->node, &group->demux->mcg_table); 1068 kfree(group); 1069 } 1070 1071 static void _mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) 1072 { 1073 int i; 1074 struct rb_node *p; 1075 struct mcast_group *group; 1076 unsigned long end; 1077 int count; 1078 1079 for (i = 0; i < MAX_VFS; ++i) 1080 clean_vf_mcast(ctx, i); 1081 1082 end = jiffies + msecs_to_jiffies(MAD_TIMEOUT_MS + 3000); 1083 do { 1084 count = 0; 1085 mutex_lock(&ctx->mcg_table_lock); 1086 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) 1087 ++count; 1088 mutex_unlock(&ctx->mcg_table_lock); 1089 if (!count) 1090 break; 1091 1092 msleep(1); 1093 } while (time_after(end, jiffies)); 1094 1095 flush_workqueue(ctx->mcg_wq); 1096 if (destroy_wq) 1097 destroy_workqueue(ctx->mcg_wq); 1098 1099 mutex_lock(&ctx->mcg_table_lock); 1100 while ((p = rb_first(&ctx->mcg_table)) != NULL) { 1101 group = rb_entry(p, struct mcast_group, node); 1102 if (atomic_read(&group->refcount)) 1103 mcg_warn_group(group, "group refcount %d!!! (pointer %p)\n", atomic_read(&group->refcount), group); 1104 1105 force_clean_group(group); 1106 } 1107 mutex_unlock(&ctx->mcg_table_lock); 1108 } 1109 1110 struct clean_work { 1111 struct work_struct work; 1112 struct mlx4_ib_demux_ctx *ctx; 1113 int destroy_wq; 1114 }; 1115 1116 static void mcg_clean_task(struct work_struct *work) 1117 { 1118 struct clean_work *cw = container_of(work, struct clean_work, work); 1119 1120 _mlx4_ib_mcg_port_cleanup(cw->ctx, cw->destroy_wq); 1121 cw->ctx->flushing = 0; 1122 kfree(cw); 1123 } 1124 1125 void mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) 1126 { 1127 struct clean_work *work; 1128 1129 if (ctx->flushing) 1130 return; 1131 1132 ctx->flushing = 1; 1133 1134 if (destroy_wq) { 1135 _mlx4_ib_mcg_port_cleanup(ctx, destroy_wq); 1136 ctx->flushing = 0; 1137 return; 1138 } 1139 1140 work = kmalloc(sizeof *work, GFP_KERNEL); 1141 if (!work) { 1142 ctx->flushing = 0; 1143 mcg_warn("failed allocating work for cleanup\n"); 1144 return; 1145 } 1146 1147 work->ctx = ctx; 1148 work->destroy_wq = destroy_wq; 1149 INIT_WORK(&work->work, mcg_clean_task); 1150 queue_work(clean_wq, &work->work); 1151 } 1152 1153 static void build_leave_mad(struct mcast_req *req) 1154 { 1155 struct ib_sa_mad *mad = &req->sa_mad; 1156 1157 mad->mad_hdr.method = IB_SA_METHOD_DELETE; 1158 } 1159 1160 1161 static void clear_pending_reqs(struct mcast_group *group, int vf) 1162 { 1163 struct mcast_req *req, *tmp, *group_first = NULL; 1164 int clear; 1165 int pend = 0; 1166 1167 if (!list_empty(&group->pending_list)) 1168 group_first = list_first_entry(&group->pending_list, struct mcast_req, group_list); 1169 1170 list_for_each_entry_safe(req, tmp, &group->func[vf].pending, func_list) { 1171 clear = 1; 1172 if (group_first == req && 1173 (group->state == MCAST_JOIN_SENT || 1174 group->state == MCAST_LEAVE_SENT)) { 1175 clear = cancel_delayed_work(&group->timeout_work); 1176 pend = !clear; 1177 group->state = MCAST_IDLE; 1178 } 1179 if (clear) { 1180 --group->func[vf].num_pend_reqs; 1181 list_del(&req->group_list); 1182 list_del(&req->func_list); 1183 kfree(req); 1184 atomic_dec(&group->refcount); 1185 } 1186 } 1187 1188 if (!pend && (!list_empty(&group->func[vf].pending) || group->func[vf].num_pend_reqs)) { 1189 mcg_warn_group(group, "DRIVER BUG: list_empty %d, num_pend_reqs %d\n", 1190 list_empty(&group->func[vf].pending), group->func[vf].num_pend_reqs); 1191 } 1192 } 1193 1194 static int push_deleteing_req(struct mcast_group *group, int slave) 1195 { 1196 struct mcast_req *req; 1197 struct mcast_req *pend_req; 1198 1199 if (!group->func[slave].join_state) 1200 return 0; 1201 1202 req = kzalloc(sizeof *req, GFP_KERNEL); 1203 if (!req) { 1204 mcg_warn_group(group, "failed allocation - may leave stall groups\n"); 1205 return -ENOMEM; 1206 } 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 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 1245 int mlx4_ib_mcg_init(void) 1246 { 1247 clean_wq = create_singlethread_workqueue("mlx4_ib_mcg"); 1248 if (!clean_wq) 1249 return -ENOMEM; 1250 1251 return 0; 1252 } 1253 1254 void mlx4_ib_mcg_destroy(void) 1255 { 1256 destroy_workqueue(clean_wq); 1257 } 1258