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 wc.pkey_index = 0; 237 wc.sl = 0; 238 wc.dlid_path_bits = 0; 239 wc.port_num = ctx->port; 240 wc.slid = ah_attr.dlid; /* opensm lid */ 241 wc.src_qp = 1; 242 return mlx4_ib_send_to_slave(dev, slave, ctx->port, IB_QPT_GSI, &wc, NULL, mad); 243 } 244 245 static int send_join_to_wire(struct mcast_group *group, struct ib_sa_mad *sa_mad) 246 { 247 struct ib_sa_mad mad; 248 struct ib_sa_mcmember_data *sa_mad_data = (struct ib_sa_mcmember_data *)&mad.data; 249 int ret; 250 251 /* we rely on a mad request as arrived from a VF */ 252 memcpy(&mad, sa_mad, sizeof mad); 253 254 /* fix port GID to be the real one (slave 0) */ 255 sa_mad_data->port_gid.global.interface_id = group->demux->guid_cache[0]; 256 257 /* assign our own TID */ 258 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux); 259 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */ 260 261 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad); 262 /* set timeout handler */ 263 if (!ret) { 264 /* calls mlx4_ib_mcg_timeout_handler */ 265 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work, 266 msecs_to_jiffies(MAD_TIMEOUT_MS)); 267 } 268 269 return ret; 270 } 271 272 static int send_leave_to_wire(struct mcast_group *group, u8 join_state) 273 { 274 struct ib_sa_mad mad; 275 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data; 276 int ret; 277 278 memset(&mad, 0, sizeof mad); 279 mad.mad_hdr.base_version = 1; 280 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 281 mad.mad_hdr.class_version = 2; 282 mad.mad_hdr.method = IB_SA_METHOD_DELETE; 283 mad.mad_hdr.status = cpu_to_be16(0); 284 mad.mad_hdr.class_specific = cpu_to_be16(0); 285 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux); 286 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */ 287 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 288 mad.mad_hdr.attr_mod = cpu_to_be32(0); 289 mad.sa_hdr.sm_key = 0x0; 290 mad.sa_hdr.attr_offset = cpu_to_be16(7); 291 mad.sa_hdr.comp_mask = IB_SA_MCMEMBER_REC_MGID | 292 IB_SA_MCMEMBER_REC_PORT_GID | IB_SA_MCMEMBER_REC_JOIN_STATE; 293 294 *sa_data = group->rec; 295 sa_data->scope_join_state = join_state; 296 297 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad); 298 if (ret) 299 group->state = MCAST_IDLE; 300 301 /* set timeout handler */ 302 if (!ret) { 303 /* calls mlx4_ib_mcg_timeout_handler */ 304 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work, 305 msecs_to_jiffies(MAD_TIMEOUT_MS)); 306 } 307 308 return ret; 309 } 310 311 static int send_reply_to_slave(int slave, struct mcast_group *group, 312 struct ib_sa_mad *req_sa_mad, u16 status) 313 { 314 struct ib_sa_mad mad; 315 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data; 316 struct ib_sa_mcmember_data *req_sa_data = (struct ib_sa_mcmember_data *)&req_sa_mad->data; 317 int ret; 318 319 memset(&mad, 0, sizeof mad); 320 mad.mad_hdr.base_version = 1; 321 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 322 mad.mad_hdr.class_version = 2; 323 mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP; 324 mad.mad_hdr.status = cpu_to_be16(status); 325 mad.mad_hdr.class_specific = cpu_to_be16(0); 326 mad.mad_hdr.tid = req_sa_mad->mad_hdr.tid; 327 *(u8 *)&mad.mad_hdr.tid = 0; /* resetting tid to 0 */ 328 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 329 mad.mad_hdr.attr_mod = cpu_to_be32(0); 330 mad.sa_hdr.sm_key = req_sa_mad->sa_hdr.sm_key; 331 mad.sa_hdr.attr_offset = cpu_to_be16(7); 332 mad.sa_hdr.comp_mask = 0; /* ignored on responses, see IBTA spec */ 333 334 *sa_data = group->rec; 335 336 /* reconstruct VF's requested join_state and port_gid */ 337 sa_data->scope_join_state &= 0xf0; 338 sa_data->scope_join_state |= (group->func[slave].join_state & 0x0f); 339 memcpy(&sa_data->port_gid, &req_sa_data->port_gid, sizeof req_sa_data->port_gid); 340 341 ret = send_mad_to_slave(slave, group->demux, (struct ib_mad *)&mad); 342 return ret; 343 } 344 345 static int check_selector(ib_sa_comp_mask comp_mask, 346 ib_sa_comp_mask selector_mask, 347 ib_sa_comp_mask value_mask, 348 u8 src_value, u8 dst_value) 349 { 350 int err; 351 u8 selector = dst_value >> 6; 352 dst_value &= 0x3f; 353 src_value &= 0x3f; 354 355 if (!(comp_mask & selector_mask) || !(comp_mask & value_mask)) 356 return 0; 357 358 switch (selector) { 359 case IB_SA_GT: 360 err = (src_value <= dst_value); 361 break; 362 case IB_SA_LT: 363 err = (src_value >= dst_value); 364 break; 365 case IB_SA_EQ: 366 err = (src_value != dst_value); 367 break; 368 default: 369 err = 0; 370 break; 371 } 372 373 return err; 374 } 375 376 static u16 cmp_rec(struct ib_sa_mcmember_data *src, 377 struct ib_sa_mcmember_data *dst, ib_sa_comp_mask comp_mask) 378 { 379 /* src is group record, dst is request record */ 380 /* MGID must already match */ 381 /* Port_GID we always replace to our Port_GID, so it is a match */ 382 383 #define MAD_STATUS_REQ_INVALID 0x0200 384 if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey) 385 return MAD_STATUS_REQ_INVALID; 386 if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid) 387 return MAD_STATUS_REQ_INVALID; 388 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR, 389 IB_SA_MCMEMBER_REC_MTU, 390 src->mtusel_mtu, dst->mtusel_mtu)) 391 return MAD_STATUS_REQ_INVALID; 392 if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS && 393 src->tclass != dst->tclass) 394 return MAD_STATUS_REQ_INVALID; 395 if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey) 396 return MAD_STATUS_REQ_INVALID; 397 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR, 398 IB_SA_MCMEMBER_REC_RATE, 399 src->ratesel_rate, dst->ratesel_rate)) 400 return MAD_STATUS_REQ_INVALID; 401 if (check_selector(comp_mask, 402 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR, 403 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME, 404 src->lifetmsel_lifetm, dst->lifetmsel_lifetm)) 405 return MAD_STATUS_REQ_INVALID; 406 if (comp_mask & IB_SA_MCMEMBER_REC_SL && 407 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0xf0000000) != 408 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0xf0000000)) 409 return MAD_STATUS_REQ_INVALID; 410 if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL && 411 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x0fffff00) != 412 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x0fffff00)) 413 return MAD_STATUS_REQ_INVALID; 414 if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT && 415 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x000000ff) != 416 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x000000ff)) 417 return MAD_STATUS_REQ_INVALID; 418 if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && 419 (src->scope_join_state & 0xf0) != 420 (dst->scope_join_state & 0xf0)) 421 return MAD_STATUS_REQ_INVALID; 422 423 /* join_state checked separately, proxy_join ignored */ 424 425 return 0; 426 } 427 428 /* release group, return 1 if this was last release and group is destroyed 429 * timout work is canceled sync */ 430 static int release_group(struct mcast_group *group, int from_timeout_handler) 431 { 432 struct mlx4_ib_demux_ctx *ctx = group->demux; 433 int nzgroup; 434 435 mutex_lock(&ctx->mcg_table_lock); 436 mutex_lock(&group->lock); 437 if (atomic_dec_and_test(&group->refcount)) { 438 if (!from_timeout_handler) { 439 if (group->state != MCAST_IDLE && 440 !cancel_delayed_work(&group->timeout_work)) { 441 atomic_inc(&group->refcount); 442 mutex_unlock(&group->lock); 443 mutex_unlock(&ctx->mcg_table_lock); 444 return 0; 445 } 446 } 447 448 nzgroup = memcmp(&group->rec.mgid, &mgid0, sizeof mgid0); 449 if (nzgroup) 450 del_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); 451 if (!list_empty(&group->pending_list)) 452 mcg_warn_group(group, "releasing a group with non empty pending list\n"); 453 if (nzgroup) 454 rb_erase(&group->node, &ctx->mcg_table); 455 list_del_init(&group->mgid0_list); 456 mutex_unlock(&group->lock); 457 mutex_unlock(&ctx->mcg_table_lock); 458 kfree(group); 459 return 1; 460 } else { 461 mutex_unlock(&group->lock); 462 mutex_unlock(&ctx->mcg_table_lock); 463 } 464 return 0; 465 } 466 467 static void adjust_membership(struct mcast_group *group, u8 join_state, int inc) 468 { 469 int i; 470 471 for (i = 0; i < 3; i++, join_state >>= 1) 472 if (join_state & 0x1) 473 group->members[i] += inc; 474 } 475 476 static u8 get_leave_state(struct mcast_group *group) 477 { 478 u8 leave_state = 0; 479 int i; 480 481 for (i = 0; i < 3; i++) 482 if (!group->members[i]) 483 leave_state |= (1 << i); 484 485 return leave_state & (group->rec.scope_join_state & 7); 486 } 487 488 static int join_group(struct mcast_group *group, int slave, u8 join_mask) 489 { 490 int ret = 0; 491 u8 join_state; 492 493 /* remove bits that slave is already member of, and adjust */ 494 join_state = join_mask & (~group->func[slave].join_state); 495 adjust_membership(group, join_state, 1); 496 group->func[slave].join_state |= join_state; 497 if (group->func[slave].state != MCAST_MEMBER && join_state) { 498 group->func[slave].state = MCAST_MEMBER; 499 ret = 1; 500 } 501 return ret; 502 } 503 504 static int leave_group(struct mcast_group *group, int slave, u8 leave_state) 505 { 506 int ret = 0; 507 508 adjust_membership(group, leave_state, -1); 509 group->func[slave].join_state &= ~leave_state; 510 if (!group->func[slave].join_state) { 511 group->func[slave].state = MCAST_NOT_MEMBER; 512 ret = 1; 513 } 514 return ret; 515 } 516 517 static int check_leave(struct mcast_group *group, int slave, u8 leave_mask) 518 { 519 if (group->func[slave].state != MCAST_MEMBER) 520 return MAD_STATUS_REQ_INVALID; 521 522 /* make sure we're not deleting unset bits */ 523 if (~group->func[slave].join_state & leave_mask) 524 return MAD_STATUS_REQ_INVALID; 525 526 if (!leave_mask) 527 return MAD_STATUS_REQ_INVALID; 528 529 return 0; 530 } 531 532 static void mlx4_ib_mcg_timeout_handler(struct work_struct *work) 533 { 534 struct delayed_work *delay = to_delayed_work(work); 535 struct mcast_group *group; 536 struct mcast_req *req = NULL; 537 538 group = container_of(delay, typeof(*group), timeout_work); 539 540 mutex_lock(&group->lock); 541 if (group->state == MCAST_JOIN_SENT) { 542 if (!list_empty(&group->pending_list)) { 543 req = list_first_entry(&group->pending_list, struct mcast_req, group_list); 544 list_del(&req->group_list); 545 list_del(&req->func_list); 546 --group->func[req->func].num_pend_reqs; 547 mutex_unlock(&group->lock); 548 kfree(req); 549 if (memcmp(&group->rec.mgid, &mgid0, sizeof mgid0)) { 550 if (release_group(group, 1)) 551 return; 552 } else { 553 kfree(group); 554 return; 555 } 556 mutex_lock(&group->lock); 557 } else 558 mcg_warn_group(group, "DRIVER BUG\n"); 559 } else if (group->state == MCAST_LEAVE_SENT) { 560 if (group->rec.scope_join_state & 7) 561 group->rec.scope_join_state &= 0xf8; 562 group->state = MCAST_IDLE; 563 mutex_unlock(&group->lock); 564 if (release_group(group, 1)) 565 return; 566 mutex_lock(&group->lock); 567 } else 568 mcg_warn_group(group, "invalid state %s\n", get_state_string(group->state)); 569 group->state = MCAST_IDLE; 570 atomic_inc(&group->refcount); 571 if (!queue_work(group->demux->mcg_wq, &group->work)) 572 safe_atomic_dec(&group->refcount); 573 574 mutex_unlock(&group->lock); 575 } 576 577 static int handle_leave_req(struct mcast_group *group, u8 leave_mask, 578 struct mcast_req *req) 579 { 580 u16 status; 581 582 if (req->clean) 583 leave_mask = group->func[req->func].join_state; 584 585 status = check_leave(group, req->func, leave_mask); 586 if (!status) 587 leave_group(group, req->func, leave_mask); 588 589 if (!req->clean) 590 send_reply_to_slave(req->func, group, &req->sa_mad, status); 591 --group->func[req->func].num_pend_reqs; 592 list_del(&req->group_list); 593 list_del(&req->func_list); 594 kfree(req); 595 return 1; 596 } 597 598 static int handle_join_req(struct mcast_group *group, u8 join_mask, 599 struct mcast_req *req) 600 { 601 u8 group_join_state = group->rec.scope_join_state & 7; 602 int ref = 0; 603 u16 status; 604 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data; 605 606 if (join_mask == (group_join_state & join_mask)) { 607 /* port's membership need not change */ 608 status = cmp_rec(&group->rec, sa_data, req->sa_mad.sa_hdr.comp_mask); 609 if (!status) 610 join_group(group, req->func, join_mask); 611 612 --group->func[req->func].num_pend_reqs; 613 send_reply_to_slave(req->func, group, &req->sa_mad, status); 614 list_del(&req->group_list); 615 list_del(&req->func_list); 616 kfree(req); 617 ++ref; 618 } else { 619 /* port's membership needs to be updated */ 620 group->prev_state = group->state; 621 if (send_join_to_wire(group, &req->sa_mad)) { 622 --group->func[req->func].num_pend_reqs; 623 list_del(&req->group_list); 624 list_del(&req->func_list); 625 kfree(req); 626 ref = 1; 627 group->state = group->prev_state; 628 } else 629 group->state = MCAST_JOIN_SENT; 630 } 631 632 return ref; 633 } 634 635 static void mlx4_ib_mcg_work_handler(struct work_struct *work) 636 { 637 struct mcast_group *group; 638 struct mcast_req *req = NULL; 639 struct ib_sa_mcmember_data *sa_data; 640 u8 req_join_state; 641 int rc = 1; /* release_count - this is for the scheduled work */ 642 u16 status; 643 u8 method; 644 645 group = container_of(work, typeof(*group), work); 646 647 mutex_lock(&group->lock); 648 649 /* First, let's see if a response from SM is waiting regarding this group. 650 * If so, we need to update the group's REC. If this is a bad response, we 651 * may need to send a bad response to a VF waiting for it. If VF is waiting 652 * and this is a good response, the VF will be answered later in this func. */ 653 if (group->state == MCAST_RESP_READY) { 654 /* cancels mlx4_ib_mcg_timeout_handler */ 655 cancel_delayed_work(&group->timeout_work); 656 status = be16_to_cpu(group->response_sa_mad.mad_hdr.status); 657 method = group->response_sa_mad.mad_hdr.method; 658 if (group->last_req_tid != group->response_sa_mad.mad_hdr.tid) { 659 mcg_warn_group(group, "Got MAD response to existing MGID but wrong TID, dropping. Resp TID=%llx, group TID=%llx\n", 660 be64_to_cpu(group->response_sa_mad.mad_hdr.tid), 661 be64_to_cpu(group->last_req_tid)); 662 group->state = group->prev_state; 663 goto process_requests; 664 } 665 if (status) { 666 if (!list_empty(&group->pending_list)) 667 req = list_first_entry(&group->pending_list, 668 struct mcast_req, group_list); 669 if ((method == IB_MGMT_METHOD_GET_RESP)) { 670 if (req) { 671 send_reply_to_slave(req->func, group, &req->sa_mad, status); 672 --group->func[req->func].num_pend_reqs; 673 list_del(&req->group_list); 674 list_del(&req->func_list); 675 kfree(req); 676 ++rc; 677 } else 678 mcg_warn_group(group, "no request for failed join\n"); 679 } else if (method == IB_SA_METHOD_DELETE_RESP && group->demux->flushing) 680 ++rc; 681 } else { 682 u8 resp_join_state; 683 u8 cur_join_state; 684 685 resp_join_state = ((struct ib_sa_mcmember_data *) 686 group->response_sa_mad.data)->scope_join_state & 7; 687 cur_join_state = group->rec.scope_join_state & 7; 688 689 if (method == IB_MGMT_METHOD_GET_RESP) { 690 /* successfull join */ 691 if (!cur_join_state && resp_join_state) 692 --rc; 693 } else if (!resp_join_state) 694 ++rc; 695 memcpy(&group->rec, group->response_sa_mad.data, sizeof group->rec); 696 } 697 group->state = MCAST_IDLE; 698 } 699 700 process_requests: 701 /* We should now go over pending join/leave requests, as long as we are idle. */ 702 while (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) { 703 req = list_first_entry(&group->pending_list, struct mcast_req, 704 group_list); 705 sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data; 706 req_join_state = sa_data->scope_join_state & 0x7; 707 708 /* For a leave request, we will immediately answer the VF, and 709 * update our internal counters. The actual leave will be sent 710 * to SM later, if at all needed. We dequeue the request now. */ 711 if (req->sa_mad.mad_hdr.method == IB_SA_METHOD_DELETE) 712 rc += handle_leave_req(group, req_join_state, req); 713 else 714 rc += handle_join_req(group, req_join_state, req); 715 } 716 717 /* Handle leaves */ 718 if (group->state == MCAST_IDLE) { 719 req_join_state = get_leave_state(group); 720 if (req_join_state) { 721 group->rec.scope_join_state &= ~req_join_state; 722 group->prev_state = group->state; 723 if (send_leave_to_wire(group, req_join_state)) { 724 group->state = group->prev_state; 725 ++rc; 726 } else 727 group->state = MCAST_LEAVE_SENT; 728 } 729 } 730 731 if (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) 732 goto process_requests; 733 mutex_unlock(&group->lock); 734 735 while (rc--) 736 release_group(group, 0); 737 } 738 739 static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx *ctx, 740 __be64 tid, 741 union ib_gid *new_mgid) 742 { 743 struct mcast_group *group = NULL, *cur_group; 744 struct mcast_req *req; 745 struct list_head *pos; 746 struct list_head *n; 747 748 mutex_lock(&ctx->mcg_table_lock); 749 list_for_each_safe(pos, n, &ctx->mcg_mgid0_list) { 750 group = list_entry(pos, struct mcast_group, mgid0_list); 751 mutex_lock(&group->lock); 752 if (group->last_req_tid == tid) { 753 if (memcmp(new_mgid, &mgid0, sizeof mgid0)) { 754 group->rec.mgid = *new_mgid; 755 sprintf(group->name, "%016llx%016llx", 756 be64_to_cpu(group->rec.mgid.global.subnet_prefix), 757 be64_to_cpu(group->rec.mgid.global.interface_id)); 758 list_del_init(&group->mgid0_list); 759 cur_group = mcast_insert(ctx, group); 760 if (cur_group) { 761 /* A race between our code and SM. Silently cleaning the new one */ 762 req = list_first_entry(&group->pending_list, 763 struct mcast_req, group_list); 764 --group->func[req->func].num_pend_reqs; 765 list_del(&req->group_list); 766 list_del(&req->func_list); 767 kfree(req); 768 mutex_unlock(&group->lock); 769 mutex_unlock(&ctx->mcg_table_lock); 770 release_group(group, 0); 771 return NULL; 772 } 773 774 atomic_inc(&group->refcount); 775 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); 776 mutex_unlock(&group->lock); 777 mutex_unlock(&ctx->mcg_table_lock); 778 return group; 779 } else { 780 struct mcast_req *tmp1, *tmp2; 781 782 list_del(&group->mgid0_list); 783 if (!list_empty(&group->pending_list) && group->state != MCAST_IDLE) 784 cancel_delayed_work_sync(&group->timeout_work); 785 786 list_for_each_entry_safe(tmp1, tmp2, &group->pending_list, group_list) { 787 list_del(&tmp1->group_list); 788 kfree(tmp1); 789 } 790 mutex_unlock(&group->lock); 791 mutex_unlock(&ctx->mcg_table_lock); 792 kfree(group); 793 return NULL; 794 } 795 } 796 mutex_unlock(&group->lock); 797 } 798 mutex_unlock(&ctx->mcg_table_lock); 799 800 return NULL; 801 } 802 803 static ssize_t sysfs_show_group(struct device *dev, 804 struct device_attribute *attr, char *buf); 805 806 static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx, 807 union ib_gid *mgid, int create, 808 gfp_t gfp_mask) 809 { 810 struct mcast_group *group, *cur_group; 811 int is_mgid0; 812 int i; 813 814 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0); 815 if (!is_mgid0) { 816 group = mcast_find(ctx, mgid); 817 if (group) 818 goto found; 819 } 820 821 if (!create) 822 return ERR_PTR(-ENOENT); 823 824 group = kzalloc(sizeof *group, gfp_mask); 825 if (!group) 826 return ERR_PTR(-ENOMEM); 827 828 group->demux = ctx; 829 group->rec.mgid = *mgid; 830 INIT_LIST_HEAD(&group->pending_list); 831 INIT_LIST_HEAD(&group->mgid0_list); 832 for (i = 0; i < MAX_VFS; ++i) 833 INIT_LIST_HEAD(&group->func[i].pending); 834 INIT_WORK(&group->work, mlx4_ib_mcg_work_handler); 835 INIT_DELAYED_WORK(&group->timeout_work, mlx4_ib_mcg_timeout_handler); 836 mutex_init(&group->lock); 837 sprintf(group->name, "%016llx%016llx", 838 be64_to_cpu(group->rec.mgid.global.subnet_prefix), 839 be64_to_cpu(group->rec.mgid.global.interface_id)); 840 sysfs_attr_init(&group->dentry.attr); 841 group->dentry.show = sysfs_show_group; 842 group->dentry.store = NULL; 843 group->dentry.attr.name = group->name; 844 group->dentry.attr.mode = 0400; 845 group->state = MCAST_IDLE; 846 847 if (is_mgid0) { 848 list_add(&group->mgid0_list, &ctx->mcg_mgid0_list); 849 goto found; 850 } 851 852 cur_group = mcast_insert(ctx, group); 853 if (cur_group) { 854 mcg_warn("group just showed up %s - confused\n", cur_group->name); 855 kfree(group); 856 return ERR_PTR(-EINVAL); 857 } 858 859 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); 860 861 found: 862 atomic_inc(&group->refcount); 863 return group; 864 } 865 866 static void queue_req(struct mcast_req *req) 867 { 868 struct mcast_group *group = req->group; 869 870 atomic_inc(&group->refcount); /* for the request */ 871 atomic_inc(&group->refcount); /* for scheduling the work */ 872 list_add_tail(&req->group_list, &group->pending_list); 873 list_add_tail(&req->func_list, &group->func[req->func].pending); 874 /* calls mlx4_ib_mcg_work_handler */ 875 if (!queue_work(group->demux->mcg_wq, &group->work)) 876 safe_atomic_dec(&group->refcount); 877 } 878 879 int mlx4_ib_mcg_demux_handler(struct ib_device *ibdev, int port, int slave, 880 struct ib_sa_mad *mad) 881 { 882 struct mlx4_ib_dev *dev = to_mdev(ibdev); 883 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)mad->data; 884 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1]; 885 struct mcast_group *group; 886 887 switch (mad->mad_hdr.method) { 888 case IB_MGMT_METHOD_GET_RESP: 889 case IB_SA_METHOD_DELETE_RESP: 890 mutex_lock(&ctx->mcg_table_lock); 891 group = acquire_group(ctx, &rec->mgid, 0, GFP_KERNEL); 892 mutex_unlock(&ctx->mcg_table_lock); 893 if (IS_ERR(group)) { 894 if (mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP) { 895 __be64 tid = mad->mad_hdr.tid; 896 *(u8 *)(&tid) = (u8)slave; /* in group we kept the modified TID */ 897 group = search_relocate_mgid0_group(ctx, tid, &rec->mgid); 898 } else 899 group = NULL; 900 } 901 902 if (!group) 903 return 1; 904 905 mutex_lock(&group->lock); 906 group->response_sa_mad = *mad; 907 group->prev_state = group->state; 908 group->state = MCAST_RESP_READY; 909 /* calls mlx4_ib_mcg_work_handler */ 910 atomic_inc(&group->refcount); 911 if (!queue_work(ctx->mcg_wq, &group->work)) 912 safe_atomic_dec(&group->refcount); 913 mutex_unlock(&group->lock); 914 release_group(group, 0); 915 return 1; /* consumed */ 916 case IB_MGMT_METHOD_SET: 917 case IB_SA_METHOD_GET_TABLE: 918 case IB_SA_METHOD_GET_TABLE_RESP: 919 case IB_SA_METHOD_DELETE: 920 return 0; /* not consumed, pass-through to guest over tunnel */ 921 default: 922 mcg_warn("In demux, port %d: unexpected MCMember method: 0x%x, dropping\n", 923 port, mad->mad_hdr.method); 924 return 1; /* consumed */ 925 } 926 } 927 928 int mlx4_ib_mcg_multiplex_handler(struct ib_device *ibdev, int port, 929 int slave, struct ib_sa_mad *sa_mad) 930 { 931 struct mlx4_ib_dev *dev = to_mdev(ibdev); 932 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)sa_mad->data; 933 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1]; 934 struct mcast_group *group; 935 struct mcast_req *req; 936 int may_create = 0; 937 938 if (ctx->flushing) 939 return -EAGAIN; 940 941 switch (sa_mad->mad_hdr.method) { 942 case IB_MGMT_METHOD_SET: 943 may_create = 1; 944 case IB_SA_METHOD_DELETE: 945 req = kzalloc(sizeof *req, GFP_KERNEL); 946 if (!req) 947 return -ENOMEM; 948 949 req->func = slave; 950 req->sa_mad = *sa_mad; 951 952 mutex_lock(&ctx->mcg_table_lock); 953 group = acquire_group(ctx, &rec->mgid, may_create, GFP_KERNEL); 954 mutex_unlock(&ctx->mcg_table_lock); 955 if (IS_ERR(group)) { 956 kfree(req); 957 return PTR_ERR(group); 958 } 959 mutex_lock(&group->lock); 960 if (group->func[slave].num_pend_reqs > MAX_PEND_REQS_PER_FUNC) { 961 mutex_unlock(&group->lock); 962 mcg_warn_group(group, "Port %d, Func %d has too many pending requests (%d), dropping\n", 963 port, slave, MAX_PEND_REQS_PER_FUNC); 964 release_group(group, 0); 965 kfree(req); 966 return -ENOMEM; 967 } 968 ++group->func[slave].num_pend_reqs; 969 req->group = group; 970 queue_req(req); 971 mutex_unlock(&group->lock); 972 release_group(group, 0); 973 return 1; /* consumed */ 974 case IB_SA_METHOD_GET_TABLE: 975 case IB_MGMT_METHOD_GET_RESP: 976 case IB_SA_METHOD_GET_TABLE_RESP: 977 case IB_SA_METHOD_DELETE_RESP: 978 return 0; /* not consumed, pass-through */ 979 default: 980 mcg_warn("In multiplex, port %d, func %d: unexpected MCMember method: 0x%x, dropping\n", 981 port, slave, sa_mad->mad_hdr.method); 982 return 1; /* consumed */ 983 } 984 } 985 986 static ssize_t sysfs_show_group(struct device *dev, 987 struct device_attribute *attr, char *buf) 988 { 989 struct mcast_group *group = 990 container_of(attr, struct mcast_group, dentry); 991 struct mcast_req *req = NULL; 992 char pending_str[40]; 993 char state_str[40]; 994 ssize_t len = 0; 995 int f; 996 997 if (group->state == MCAST_IDLE) 998 sprintf(state_str, "%s", get_state_string(group->state)); 999 else 1000 sprintf(state_str, "%s(TID=0x%llx)", 1001 get_state_string(group->state), 1002 be64_to_cpu(group->last_req_tid)); 1003 if (list_empty(&group->pending_list)) { 1004 sprintf(pending_str, "No"); 1005 } else { 1006 req = list_first_entry(&group->pending_list, struct mcast_req, group_list); 1007 sprintf(pending_str, "Yes(TID=0x%llx)", 1008 be64_to_cpu(req->sa_mad.mad_hdr.tid)); 1009 } 1010 len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s ", 1011 group->rec.scope_join_state & 0xf, 1012 group->members[2], group->members[1], group->members[0], 1013 atomic_read(&group->refcount), 1014 pending_str, 1015 state_str); 1016 for (f = 0; f < MAX_VFS; ++f) 1017 if (group->func[f].state == MCAST_MEMBER) 1018 len += sprintf(buf + len, "%d[%1x] ", 1019 f, group->func[f].join_state); 1020 1021 len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x " 1022 "%4x %4x %2x %2x)\n", 1023 be16_to_cpu(group->rec.pkey), 1024 be32_to_cpu(group->rec.qkey), 1025 (group->rec.mtusel_mtu & 0xc0) >> 6, 1026 group->rec.mtusel_mtu & 0x3f, 1027 group->rec.tclass, 1028 (group->rec.ratesel_rate & 0xc0) >> 6, 1029 group->rec.ratesel_rate & 0x3f, 1030 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28, 1031 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8, 1032 be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff, 1033 group->rec.proxy_join); 1034 1035 return len; 1036 } 1037 1038 int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx) 1039 { 1040 char name[20]; 1041 1042 atomic_set(&ctx->tid, 0); 1043 sprintf(name, "mlx4_ib_mcg%d", ctx->port); 1044 ctx->mcg_wq = create_singlethread_workqueue(name); 1045 if (!ctx->mcg_wq) 1046 return -ENOMEM; 1047 1048 mutex_init(&ctx->mcg_table_lock); 1049 ctx->mcg_table = RB_ROOT; 1050 INIT_LIST_HEAD(&ctx->mcg_mgid0_list); 1051 ctx->flushing = 0; 1052 1053 return 0; 1054 } 1055 1056 static void force_clean_group(struct mcast_group *group) 1057 { 1058 struct mcast_req *req, *tmp 1059 ; 1060 list_for_each_entry_safe(req, tmp, &group->pending_list, group_list) { 1061 list_del(&req->group_list); 1062 kfree(req); 1063 } 1064 del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr); 1065 rb_erase(&group->node, &group->demux->mcg_table); 1066 kfree(group); 1067 } 1068 1069 static void _mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) 1070 { 1071 int i; 1072 struct rb_node *p; 1073 struct mcast_group *group; 1074 unsigned long end; 1075 int count; 1076 1077 if (ctx->flushing) 1078 return; 1079 1080 ctx->flushing = 1; 1081 for (i = 0; i < MAX_VFS; ++i) 1082 clean_vf_mcast(ctx, i); 1083 1084 end = jiffies + msecs_to_jiffies(MAD_TIMEOUT_MS + 3000); 1085 do { 1086 count = 0; 1087 mutex_lock(&ctx->mcg_table_lock); 1088 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) 1089 ++count; 1090 mutex_unlock(&ctx->mcg_table_lock); 1091 if (!count) 1092 break; 1093 1094 msleep(1); 1095 } while (time_after(end, jiffies)); 1096 1097 flush_workqueue(ctx->mcg_wq); 1098 if (destroy_wq) 1099 destroy_workqueue(ctx->mcg_wq); 1100 1101 mutex_lock(&ctx->mcg_table_lock); 1102 while ((p = rb_first(&ctx->mcg_table)) != NULL) { 1103 group = rb_entry(p, struct mcast_group, node); 1104 if (atomic_read(&group->refcount)) 1105 mcg_warn_group(group, "group refcount %d!!! (pointer %p)\n", atomic_read(&group->refcount), group); 1106 1107 force_clean_group(group); 1108 } 1109 mutex_unlock(&ctx->mcg_table_lock); 1110 1111 if (!destroy_wq) 1112 ctx->flushing = 0; 1113 } 1114 1115 struct clean_work { 1116 struct work_struct work; 1117 struct mlx4_ib_demux_ctx *ctx; 1118 int destroy_wq; 1119 }; 1120 1121 static void mcg_clean_task(struct work_struct *work) 1122 { 1123 struct clean_work *cw = container_of(work, struct clean_work, work); 1124 1125 _mlx4_ib_mcg_port_cleanup(cw->ctx, cw->destroy_wq); 1126 kfree(cw); 1127 } 1128 1129 void mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) 1130 { 1131 struct clean_work *work; 1132 1133 if (destroy_wq) { 1134 _mlx4_ib_mcg_port_cleanup(ctx, destroy_wq); 1135 return; 1136 } 1137 1138 work = kmalloc(sizeof *work, GFP_KERNEL); 1139 if (!work) { 1140 mcg_warn("failed allocating work for cleanup\n"); 1141 return; 1142 } 1143 1144 work->ctx = ctx; 1145 work->destroy_wq = destroy_wq; 1146 INIT_WORK(&work->work, mcg_clean_task); 1147 queue_work(clean_wq, &work->work); 1148 } 1149 1150 static void build_leave_mad(struct mcast_req *req) 1151 { 1152 struct ib_sa_mad *mad = &req->sa_mad; 1153 1154 mad->mad_hdr.method = IB_SA_METHOD_DELETE; 1155 } 1156 1157 1158 static void clear_pending_reqs(struct mcast_group *group, int vf) 1159 { 1160 struct mcast_req *req, *tmp, *group_first = NULL; 1161 int clear; 1162 int pend = 0; 1163 1164 if (!list_empty(&group->pending_list)) 1165 group_first = list_first_entry(&group->pending_list, struct mcast_req, group_list); 1166 1167 list_for_each_entry_safe(req, tmp, &group->func[vf].pending, func_list) { 1168 clear = 1; 1169 if (group_first == req && 1170 (group->state == MCAST_JOIN_SENT || 1171 group->state == MCAST_LEAVE_SENT)) { 1172 clear = cancel_delayed_work(&group->timeout_work); 1173 pend = !clear; 1174 group->state = MCAST_IDLE; 1175 } 1176 if (clear) { 1177 --group->func[vf].num_pend_reqs; 1178 list_del(&req->group_list); 1179 list_del(&req->func_list); 1180 kfree(req); 1181 atomic_dec(&group->refcount); 1182 } 1183 } 1184 1185 if (!pend && (!list_empty(&group->func[vf].pending) || group->func[vf].num_pend_reqs)) { 1186 mcg_warn_group(group, "DRIVER BUG: list_empty %d, num_pend_reqs %d\n", 1187 list_empty(&group->func[vf].pending), group->func[vf].num_pend_reqs); 1188 } 1189 } 1190 1191 static int push_deleteing_req(struct mcast_group *group, int slave) 1192 { 1193 struct mcast_req *req; 1194 struct mcast_req *pend_req; 1195 1196 if (!group->func[slave].join_state) 1197 return 0; 1198 1199 req = kzalloc(sizeof *req, GFP_KERNEL); 1200 if (!req) { 1201 mcg_warn_group(group, "failed allocation - may leave stall groups\n"); 1202 return -ENOMEM; 1203 } 1204 1205 if (!list_empty(&group->func[slave].pending)) { 1206 pend_req = list_entry(group->func[slave].pending.prev, struct mcast_req, group_list); 1207 if (pend_req->clean) { 1208 kfree(req); 1209 return 0; 1210 } 1211 } 1212 1213 req->clean = 1; 1214 req->func = slave; 1215 req->group = group; 1216 ++group->func[slave].num_pend_reqs; 1217 build_leave_mad(req); 1218 queue_req(req); 1219 return 0; 1220 } 1221 1222 void clean_vf_mcast(struct mlx4_ib_demux_ctx *ctx, int slave) 1223 { 1224 struct mcast_group *group; 1225 struct rb_node *p; 1226 1227 mutex_lock(&ctx->mcg_table_lock); 1228 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) { 1229 group = rb_entry(p, struct mcast_group, node); 1230 mutex_lock(&group->lock); 1231 if (atomic_read(&group->refcount)) { 1232 /* clear pending requests of this VF */ 1233 clear_pending_reqs(group, slave); 1234 push_deleteing_req(group, slave); 1235 } 1236 mutex_unlock(&group->lock); 1237 } 1238 mutex_unlock(&ctx->mcg_table_lock); 1239 } 1240 1241 1242 int mlx4_ib_mcg_init(void) 1243 { 1244 clean_wq = create_singlethread_workqueue("mlx4_ib_mcg"); 1245 if (!clean_wq) 1246 return -ENOMEM; 1247 1248 return 0; 1249 } 1250 1251 void mlx4_ib_mcg_destroy(void) 1252 { 1253 destroy_workqueue(clean_wq); 1254 } 1255