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