mlx4_ib_mcg.c revision 331769
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 <dev/mlx4/cmd.h> 39#include <linux/rbtree.h> 40#include <linux/delay.h> 41 42#include "mlx4_ib.h" 43 44#define MAX_VFS 80 45#define MAX_PEND_REQS_PER_FUNC 4 46#define MAD_TIMEOUT_MS 2000 47 48#define mcg_warn(fmt, arg...) pr_warn("MCG WARNING: " fmt, ##arg) 49#define mcg_error(fmt, arg...) pr_err(fmt, ##arg) 50#define mcg_warn_group(group, format, arg...) \ 51 pr_warn("%s-%d: %16s (port %d): WARNING: " format, __func__, __LINE__,\ 52 (group)->name, group->demux->port, ## arg) 53 54#define mcg_debug_group(group, format, arg...) \ 55 pr_debug("%s-%d: %16s (port %d): WARNING: " format, __func__, __LINE__,\ 56 (group)->name, (group)->demux->port, ## arg) 57 58#define mcg_error_group(group, format, arg...) \ 59 pr_err(" %16s: " format, (group)->name, ## arg) 60 61 62static union ib_gid mgid0; 63 64static struct workqueue_struct *clean_wq; 65 66enum mcast_state { 67 MCAST_NOT_MEMBER = 0, 68 MCAST_MEMBER, 69}; 70 71enum mcast_group_state { 72 MCAST_IDLE, 73 MCAST_JOIN_SENT, 74 MCAST_LEAVE_SENT, 75 MCAST_RESP_READY 76}; 77 78struct mcast_member { 79 enum mcast_state state; 80 uint8_t join_state; 81 int num_pend_reqs; 82 struct list_head pending; 83}; 84 85struct ib_sa_mcmember_data { 86 union ib_gid mgid; 87 union ib_gid port_gid; 88 __be32 qkey; 89 __be16 mlid; 90 u8 mtusel_mtu; 91 u8 tclass; 92 __be16 pkey; 93 u8 ratesel_rate; 94 u8 lifetmsel_lifetm; 95 __be32 sl_flowlabel_hoplimit; 96 u8 scope_join_state; 97 u8 proxy_join; 98 u8 reserved[2]; 99} __packed __aligned(4); 100 101struct mcast_group { 102 struct ib_sa_mcmember_data rec; 103 struct rb_node node; 104 struct list_head mgid0_list; 105 struct mlx4_ib_demux_ctx *demux; 106 struct mcast_member func[MAX_VFS]; 107 struct mutex lock; 108 struct work_struct work; 109 struct list_head pending_list; 110 int members[3]; 111 enum mcast_group_state state; 112 enum mcast_group_state prev_state; 113 struct ib_sa_mad response_sa_mad; 114 __be64 last_req_tid; 115 116 char name[33]; /* MGID string */ 117 struct device_attribute dentry; 118 119 /* refcount is the reference count for the following: 120 1. Each queued request 121 2. Each invocation of the worker thread 122 3. Membership of the port at the SA 123 */ 124 atomic_t refcount; 125 126 /* delayed work to clean pending SM request */ 127 struct delayed_work timeout_work; 128 struct list_head cleanup_list; 129}; 130 131struct mcast_req { 132 int func; 133 struct ib_sa_mad sa_mad; 134 struct list_head group_list; 135 struct list_head func_list; 136 struct mcast_group *group; 137 int clean; 138}; 139 140 141#define safe_atomic_dec(ref) \ 142 do {\ 143 if (atomic_dec_and_test(ref)) \ 144 mcg_warn_group(group, "did not expect to reach zero\n"); \ 145 } while (0) 146 147static const char *get_state_string(enum mcast_group_state state) 148{ 149 switch (state) { 150 case MCAST_IDLE: 151 return "MCAST_IDLE"; 152 case MCAST_JOIN_SENT: 153 return "MCAST_JOIN_SENT"; 154 case MCAST_LEAVE_SENT: 155 return "MCAST_LEAVE_SENT"; 156 case MCAST_RESP_READY: 157 return "MCAST_RESP_READY"; 158 } 159 return "Invalid State"; 160} 161 162static struct mcast_group *mcast_find(struct mlx4_ib_demux_ctx *ctx, 163 union ib_gid *mgid) 164{ 165 struct rb_node *node = ctx->mcg_table.rb_node; 166 struct mcast_group *group; 167 int ret; 168 169 while (node) { 170 group = rb_entry(node, struct mcast_group, node); 171 ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid); 172 if (!ret) 173 return group; 174 175 if (ret < 0) 176 node = node->rb_left; 177 else 178 node = node->rb_right; 179 } 180 return NULL; 181} 182 183static struct mcast_group *mcast_insert(struct mlx4_ib_demux_ctx *ctx, 184 struct mcast_group *group) 185{ 186 struct rb_node **link = &ctx->mcg_table.rb_node; 187 struct rb_node *parent = NULL; 188 struct mcast_group *cur_group; 189 int ret; 190 191 while (*link) { 192 parent = *link; 193 cur_group = rb_entry(parent, struct mcast_group, node); 194 195 ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw, 196 sizeof group->rec.mgid); 197 if (ret < 0) 198 link = &(*link)->rb_left; 199 else if (ret > 0) 200 link = &(*link)->rb_right; 201 else 202 return cur_group; 203 } 204 rb_link_node(&group->node, parent, link); 205 rb_insert_color(&group->node, &ctx->mcg_table); 206 return NULL; 207} 208 209static int send_mad_to_wire(struct mlx4_ib_demux_ctx *ctx, struct ib_mad *mad) 210{ 211 struct mlx4_ib_dev *dev = ctx->dev; 212 struct ib_ah_attr ah_attr; 213 unsigned long flags; 214 215 spin_lock_irqsave(&dev->sm_lock, flags); 216 if (!dev->sm_ah[ctx->port - 1]) { 217 /* port is not yet Active, sm_ah not ready */ 218 spin_unlock_irqrestore(&dev->sm_lock, flags); 219 return -EAGAIN; 220 } 221 mlx4_ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr); 222 spin_unlock_irqrestore(&dev->sm_lock, flags); 223 return mlx4_ib_send_to_wire(dev, mlx4_master_func_num(dev->dev), 224 ctx->port, IB_QPT_GSI, 0, 1, IB_QP1_QKEY, 225 &ah_attr, NULL, 0xffff, mad); 226} 227 228static int send_mad_to_slave(int slave, struct mlx4_ib_demux_ctx *ctx, 229 struct ib_mad *mad) 230{ 231 struct mlx4_ib_dev *dev = ctx->dev; 232 struct ib_mad_agent *agent = dev->send_agent[ctx->port - 1][1]; 233 struct ib_wc wc; 234 struct ib_ah_attr ah_attr; 235 236 /* Our agent might not yet be registered when mads start to arrive */ 237 if (!agent) 238 return -EAGAIN; 239 240 ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr); 241 242 if (ib_find_cached_pkey(&dev->ib_dev, ctx->port, IB_DEFAULT_PKEY_FULL, &wc.pkey_index)) 243 return -EINVAL; 244 wc.sl = 0; 245 wc.dlid_path_bits = 0; 246 wc.port_num = ctx->port; 247 wc.slid = ah_attr.dlid; /* opensm lid */ 248 wc.src_qp = 1; 249 return mlx4_ib_send_to_slave(dev, slave, ctx->port, IB_QPT_GSI, &wc, NULL, mad); 250} 251 252static int send_join_to_wire(struct mcast_group *group, struct ib_sa_mad *sa_mad) 253{ 254 struct ib_sa_mad mad; 255 struct ib_sa_mcmember_data *sa_mad_data = (struct ib_sa_mcmember_data *)&mad.data; 256 int ret; 257 258 /* we rely on a mad request as arrived from a VF */ 259 memcpy(&mad, sa_mad, sizeof mad); 260 261 /* fix port GID to be the real one (slave 0) */ 262 sa_mad_data->port_gid.global.interface_id = group->demux->guid_cache[0]; 263 264 /* assign our own TID */ 265 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux); 266 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */ 267 268 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad); 269 /* set timeout handler */ 270 if (!ret) { 271 /* calls mlx4_ib_mcg_timeout_handler */ 272 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work, 273 msecs_to_jiffies(MAD_TIMEOUT_MS)); 274 } 275 276 return ret; 277} 278 279static int send_leave_to_wire(struct mcast_group *group, u8 join_state) 280{ 281 struct ib_sa_mad mad; 282 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data; 283 int ret; 284 285 memset(&mad, 0, sizeof mad); 286 mad.mad_hdr.base_version = 1; 287 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 288 mad.mad_hdr.class_version = 2; 289 mad.mad_hdr.method = IB_SA_METHOD_DELETE; 290 mad.mad_hdr.status = cpu_to_be16(0); 291 mad.mad_hdr.class_specific = cpu_to_be16(0); 292 mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux); 293 group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */ 294 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 295 mad.mad_hdr.attr_mod = cpu_to_be32(0); 296 mad.sa_hdr.sm_key = 0x0; 297 mad.sa_hdr.attr_offset = cpu_to_be16(7); 298 mad.sa_hdr.comp_mask = IB_SA_MCMEMBER_REC_MGID | 299 IB_SA_MCMEMBER_REC_PORT_GID | IB_SA_MCMEMBER_REC_JOIN_STATE; 300 301 *sa_data = group->rec; 302 sa_data->scope_join_state = join_state; 303 304 ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad); 305 if (ret) 306 group->state = MCAST_IDLE; 307 308 /* set timeout handler */ 309 if (!ret) { 310 /* calls mlx4_ib_mcg_timeout_handler */ 311 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work, 312 msecs_to_jiffies(MAD_TIMEOUT_MS)); 313 } 314 315 return ret; 316} 317 318static int send_reply_to_slave(int slave, struct mcast_group *group, 319 struct ib_sa_mad *req_sa_mad, u16 status) 320{ 321 struct ib_sa_mad mad; 322 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data; 323 struct ib_sa_mcmember_data *req_sa_data = (struct ib_sa_mcmember_data *)&req_sa_mad->data; 324 int ret; 325 326 memset(&mad, 0, sizeof mad); 327 mad.mad_hdr.base_version = 1; 328 mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 329 mad.mad_hdr.class_version = 2; 330 mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP; 331 mad.mad_hdr.status = cpu_to_be16(status); 332 mad.mad_hdr.class_specific = cpu_to_be16(0); 333 mad.mad_hdr.tid = req_sa_mad->mad_hdr.tid; 334 *(u8 *)&mad.mad_hdr.tid = 0; /* resetting tid to 0 */ 335 mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 336 mad.mad_hdr.attr_mod = cpu_to_be32(0); 337 mad.sa_hdr.sm_key = req_sa_mad->sa_hdr.sm_key; 338 mad.sa_hdr.attr_offset = cpu_to_be16(7); 339 mad.sa_hdr.comp_mask = 0; /* ignored on responses, see IBTA spec */ 340 341 *sa_data = group->rec; 342 343 /* reconstruct VF's requested join_state and port_gid */ 344 sa_data->scope_join_state &= 0xf0; 345 sa_data->scope_join_state |= (group->func[slave].join_state & 0x0f); 346 memcpy(&sa_data->port_gid, &req_sa_data->port_gid, sizeof req_sa_data->port_gid); 347 348 ret = send_mad_to_slave(slave, group->demux, (struct ib_mad *)&mad); 349 return ret; 350} 351 352static int check_selector(ib_sa_comp_mask comp_mask, 353 ib_sa_comp_mask selector_mask, 354 ib_sa_comp_mask value_mask, 355 u8 src_value, u8 dst_value) 356{ 357 int err; 358 u8 selector = dst_value >> 6; 359 dst_value &= 0x3f; 360 src_value &= 0x3f; 361 362 if (!(comp_mask & selector_mask) || !(comp_mask & value_mask)) 363 return 0; 364 365 switch (selector) { 366 case IB_SA_GT: 367 err = (src_value <= dst_value); 368 break; 369 case IB_SA_LT: 370 err = (src_value >= dst_value); 371 break; 372 case IB_SA_EQ: 373 err = (src_value != dst_value); 374 break; 375 default: 376 err = 0; 377 break; 378 } 379 380 return err; 381} 382 383static u16 cmp_rec(struct ib_sa_mcmember_data *src, 384 struct ib_sa_mcmember_data *dst, ib_sa_comp_mask comp_mask) 385{ 386 /* src is group record, dst is request record */ 387 /* MGID must already match */ 388 /* Port_GID we always replace to our Port_GID, so it is a match */ 389 390#define MAD_STATUS_REQ_INVALID 0x0200 391 if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey) 392 return MAD_STATUS_REQ_INVALID; 393 if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid) 394 return MAD_STATUS_REQ_INVALID; 395 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR, 396 IB_SA_MCMEMBER_REC_MTU, 397 src->mtusel_mtu, dst->mtusel_mtu)) 398 return MAD_STATUS_REQ_INVALID; 399 if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS && 400 src->tclass != dst->tclass) 401 return MAD_STATUS_REQ_INVALID; 402 if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey) 403 return MAD_STATUS_REQ_INVALID; 404 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR, 405 IB_SA_MCMEMBER_REC_RATE, 406 src->ratesel_rate, dst->ratesel_rate)) 407 return MAD_STATUS_REQ_INVALID; 408 if (check_selector(comp_mask, 409 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR, 410 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME, 411 src->lifetmsel_lifetm, dst->lifetmsel_lifetm)) 412 return MAD_STATUS_REQ_INVALID; 413 if (comp_mask & IB_SA_MCMEMBER_REC_SL && 414 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0xf0000000) != 415 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0xf0000000)) 416 return MAD_STATUS_REQ_INVALID; 417 if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL && 418 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x0fffff00) != 419 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x0fffff00)) 420 return MAD_STATUS_REQ_INVALID; 421 if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT && 422 (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x000000ff) != 423 (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x000000ff)) 424 return MAD_STATUS_REQ_INVALID; 425 if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && 426 (src->scope_join_state & 0xf0) != 427 (dst->scope_join_state & 0xf0)) 428 return MAD_STATUS_REQ_INVALID; 429 430 /* join_state checked separately, proxy_join ignored */ 431 432 return 0; 433} 434 435/* release group, return 1 if this was last release and group is destroyed 436 * timout work is canceled sync */ 437static int release_group(struct mcast_group *group, int from_timeout_handler) 438{ 439 struct mlx4_ib_demux_ctx *ctx = group->demux; 440 int nzgroup; 441 442 mutex_lock(&ctx->mcg_table_lock); 443 mutex_lock(&group->lock); 444 if (atomic_dec_and_test(&group->refcount)) { 445 if (!from_timeout_handler) { 446 if (group->state != MCAST_IDLE && 447 !cancel_delayed_work(&group->timeout_work)) { 448 atomic_inc(&group->refcount); 449 mutex_unlock(&group->lock); 450 mutex_unlock(&ctx->mcg_table_lock); 451 return 0; 452 } 453 } 454 455 nzgroup = memcmp(&group->rec.mgid, &mgid0, sizeof mgid0); 456 if (nzgroup) 457 del_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); 458 if (!list_empty(&group->pending_list)) 459 mcg_warn_group(group, "releasing a group with non empty pending list\n"); 460 if (nzgroup) 461 rb_erase(&group->node, &ctx->mcg_table); 462 list_del_init(&group->mgid0_list); 463 mutex_unlock(&group->lock); 464 mutex_unlock(&ctx->mcg_table_lock); 465 kfree(group); 466 return 1; 467 } else { 468 mutex_unlock(&group->lock); 469 mutex_unlock(&ctx->mcg_table_lock); 470 } 471 return 0; 472} 473 474static void adjust_membership(struct mcast_group *group, u8 join_state, int inc) 475{ 476 int i; 477 478 for (i = 0; i < 3; i++, join_state >>= 1) 479 if (join_state & 0x1) 480 group->members[i] += inc; 481} 482 483static u8 get_leave_state(struct mcast_group *group) 484{ 485 u8 leave_state = 0; 486 int i; 487 488 for (i = 0; i < 3; i++) 489 if (!group->members[i]) 490 leave_state |= (1 << i); 491 492 return leave_state & (group->rec.scope_join_state & 0xf); 493} 494 495static int join_group(struct mcast_group *group, int slave, u8 join_mask) 496{ 497 int ret = 0; 498 u8 join_state; 499 500 /* remove bits that slave is already member of, and adjust */ 501 join_state = join_mask & (~group->func[slave].join_state); 502 adjust_membership(group, join_state, 1); 503 group->func[slave].join_state |= join_state; 504 if (group->func[slave].state != MCAST_MEMBER && join_state) { 505 group->func[slave].state = MCAST_MEMBER; 506 ret = 1; 507 } 508 return ret; 509} 510 511static int leave_group(struct mcast_group *group, int slave, u8 leave_state) 512{ 513 int ret = 0; 514 515 adjust_membership(group, leave_state, -1); 516 group->func[slave].join_state &= ~leave_state; 517 if (!group->func[slave].join_state) { 518 group->func[slave].state = MCAST_NOT_MEMBER; 519 ret = 1; 520 } 521 return ret; 522} 523 524static int check_leave(struct mcast_group *group, int slave, u8 leave_mask) 525{ 526 if (group->func[slave].state != MCAST_MEMBER) 527 return MAD_STATUS_REQ_INVALID; 528 529 /* make sure we're not deleting unset bits */ 530 if (~group->func[slave].join_state & leave_mask) 531 return MAD_STATUS_REQ_INVALID; 532 533 if (!leave_mask) 534 return MAD_STATUS_REQ_INVALID; 535 536 return 0; 537} 538 539static void mlx4_ib_mcg_timeout_handler(struct work_struct *work) 540{ 541 struct delayed_work *delay = to_delayed_work(work); 542 struct mcast_group *group; 543 struct mcast_req *req = NULL; 544 545 group = container_of(delay, typeof(*group), timeout_work); 546 547 mutex_lock(&group->lock); 548 if (group->state == MCAST_JOIN_SENT) { 549 if (!list_empty(&group->pending_list)) { 550 req = list_first_entry(&group->pending_list, struct mcast_req, group_list); 551 list_del(&req->group_list); 552 list_del(&req->func_list); 553 --group->func[req->func].num_pend_reqs; 554 mutex_unlock(&group->lock); 555 kfree(req); 556 if (memcmp(&group->rec.mgid, &mgid0, sizeof mgid0)) { 557 if (release_group(group, 1)) 558 return; 559 } else { 560 kfree(group); 561 return; 562 } 563 mutex_lock(&group->lock); 564 } else 565 mcg_warn_group(group, "DRIVER BUG\n"); 566 } else if (group->state == MCAST_LEAVE_SENT) { 567 if (group->rec.scope_join_state & 0xf) 568 group->rec.scope_join_state &= 0xf0; 569 group->state = MCAST_IDLE; 570 mutex_unlock(&group->lock); 571 if (release_group(group, 1)) 572 return; 573 mutex_lock(&group->lock); 574 } else 575 mcg_warn_group(group, "invalid state %s\n", get_state_string(group->state)); 576 group->state = MCAST_IDLE; 577 atomic_inc(&group->refcount); 578 if (!queue_work(group->demux->mcg_wq, &group->work)) 579 safe_atomic_dec(&group->refcount); 580 581 mutex_unlock(&group->lock); 582} 583 584static int handle_leave_req(struct mcast_group *group, u8 leave_mask, 585 struct mcast_req *req) 586{ 587 u16 status; 588 589 if (req->clean) 590 leave_mask = group->func[req->func].join_state; 591 592 status = check_leave(group, req->func, leave_mask); 593 if (!status) 594 leave_group(group, req->func, leave_mask); 595 596 if (!req->clean) 597 send_reply_to_slave(req->func, group, &req->sa_mad, status); 598 --group->func[req->func].num_pend_reqs; 599 list_del(&req->group_list); 600 list_del(&req->func_list); 601 kfree(req); 602 return 1; 603} 604 605static int handle_join_req(struct mcast_group *group, u8 join_mask, 606 struct mcast_req *req) 607{ 608 u8 group_join_state = group->rec.scope_join_state & 0xf; 609 int ref = 0; 610 u16 status; 611 struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data; 612 613 if (join_mask == (group_join_state & join_mask)) { 614 /* port's membership need not change */ 615 status = cmp_rec(&group->rec, sa_data, req->sa_mad.sa_hdr.comp_mask); 616 if (!status) 617 join_group(group, req->func, join_mask); 618 619 --group->func[req->func].num_pend_reqs; 620 send_reply_to_slave(req->func, group, &req->sa_mad, status); 621 list_del(&req->group_list); 622 list_del(&req->func_list); 623 kfree(req); 624 ++ref; 625 } else { 626 /* port's membership needs to be updated */ 627 group->prev_state = group->state; 628 if (send_join_to_wire(group, &req->sa_mad)) { 629 --group->func[req->func].num_pend_reqs; 630 list_del(&req->group_list); 631 list_del(&req->func_list); 632 kfree(req); 633 ref = 1; 634 group->state = group->prev_state; 635 } else 636 group->state = MCAST_JOIN_SENT; 637 } 638 639 return ref; 640} 641 642static void mlx4_ib_mcg_work_handler(struct work_struct *work) 643{ 644 struct mcast_group *group; 645 struct mcast_req *req = NULL; 646 struct ib_sa_mcmember_data *sa_data; 647 u8 req_join_state; 648 int rc = 1; /* release_count - this is for the scheduled work */ 649 u16 status; 650 u8 method; 651 652 group = container_of(work, typeof(*group), work); 653 654 mutex_lock(&group->lock); 655 656 /* First, let's see if a response from SM is waiting regarding this group. 657 * If so, we need to update the group's REC. If this is a bad response, we 658 * may need to send a bad response to a VF waiting for it. If VF is waiting 659 * and this is a good response, the VF will be answered later in this func. */ 660 if (group->state == MCAST_RESP_READY) { 661 /* cancels mlx4_ib_mcg_timeout_handler */ 662 cancel_delayed_work(&group->timeout_work); 663 status = be16_to_cpu(group->response_sa_mad.mad_hdr.status); 664 method = group->response_sa_mad.mad_hdr.method; 665 if (group->last_req_tid != group->response_sa_mad.mad_hdr.tid) { 666 mcg_warn_group(group, "Got MAD response to existing MGID but wrong TID, dropping. Resp TID=%llx, group TID=%llx\n", 667 (long long)be64_to_cpu( 668 group->response_sa_mad.mad_hdr.tid), 669 (long long)be64_to_cpu(group->last_req_tid)); 670 group->state = group->prev_state; 671 goto process_requests; 672 } 673 if (status) { 674 if (!list_empty(&group->pending_list)) 675 req = list_first_entry(&group->pending_list, 676 struct mcast_req, group_list); 677 if (method == IB_MGMT_METHOD_GET_RESP) { 678 if (req) { 679 send_reply_to_slave(req->func, group, &req->sa_mad, status); 680 --group->func[req->func].num_pend_reqs; 681 list_del(&req->group_list); 682 list_del(&req->func_list); 683 kfree(req); 684 ++rc; 685 } else 686 mcg_warn_group(group, "no request for failed join\n"); 687 } else if (method == IB_SA_METHOD_DELETE_RESP && group->demux->flushing) 688 ++rc; 689 } else { 690 u8 resp_join_state; 691 u8 cur_join_state; 692 693 resp_join_state = ((struct ib_sa_mcmember_data *) 694 group->response_sa_mad.data)->scope_join_state & 0xf; 695 cur_join_state = group->rec.scope_join_state & 0xf; 696 697 if (method == IB_MGMT_METHOD_GET_RESP) { 698 /* successfull join */ 699 if (!cur_join_state && resp_join_state) 700 --rc; 701 } else if (!resp_join_state) 702 ++rc; 703 memcpy(&group->rec, group->response_sa_mad.data, sizeof group->rec); 704 } 705 group->state = MCAST_IDLE; 706 } 707 708process_requests: 709 /* We should now go over pending join/leave requests, as long as we are idle. */ 710 while (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) { 711 req = list_first_entry(&group->pending_list, struct mcast_req, 712 group_list); 713 sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data; 714 req_join_state = sa_data->scope_join_state & 0xf; 715 716 /* For a leave request, we will immediately answer the VF, and 717 * update our internal counters. The actual leave will be sent 718 * to SM later, if at all needed. We dequeue the request now. */ 719 if (req->sa_mad.mad_hdr.method == IB_SA_METHOD_DELETE) 720 rc += handle_leave_req(group, req_join_state, req); 721 else 722 rc += handle_join_req(group, req_join_state, req); 723 } 724 725 /* Handle leaves */ 726 if (group->state == MCAST_IDLE) { 727 req_join_state = get_leave_state(group); 728 if (req_join_state) { 729 group->rec.scope_join_state &= ~req_join_state; 730 group->prev_state = group->state; 731 if (send_leave_to_wire(group, req_join_state)) { 732 group->state = group->prev_state; 733 ++rc; 734 } else 735 group->state = MCAST_LEAVE_SENT; 736 } 737 } 738 739 if (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) 740 goto process_requests; 741 mutex_unlock(&group->lock); 742 743 while (rc--) 744 release_group(group, 0); 745} 746 747static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx *ctx, 748 __be64 tid, 749 union ib_gid *new_mgid) 750{ 751 struct mcast_group *group = NULL, *cur_group, *n; 752 struct mcast_req *req; 753 754 mutex_lock(&ctx->mcg_table_lock); 755 list_for_each_entry_safe(group, n, &ctx->mcg_mgid0_list, mgid0_list) { 756 mutex_lock(&group->lock); 757 if (group->last_req_tid == tid) { 758 if (memcmp(new_mgid, &mgid0, sizeof mgid0)) { 759 group->rec.mgid = *new_mgid; 760 sprintf(group->name, "%016llx%016llx", 761 (long long)be64_to_cpu(group->rec.mgid.global.subnet_prefix), 762 (long long)be64_to_cpu(group->rec.mgid.global.interface_id)); 763 list_del_init(&group->mgid0_list); 764 cur_group = mcast_insert(ctx, group); 765 if (cur_group) { 766 /* A race between our code and SM. Silently cleaning the new one */ 767 req = list_first_entry(&group->pending_list, 768 struct mcast_req, group_list); 769 --group->func[req->func].num_pend_reqs; 770 list_del(&req->group_list); 771 list_del(&req->func_list); 772 kfree(req); 773 mutex_unlock(&group->lock); 774 mutex_unlock(&ctx->mcg_table_lock); 775 release_group(group, 0); 776 return NULL; 777 } 778 779 atomic_inc(&group->refcount); 780 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); 781 mutex_unlock(&group->lock); 782 mutex_unlock(&ctx->mcg_table_lock); 783 return group; 784 } else { 785 struct mcast_req *tmp1, *tmp2; 786 787 list_del(&group->mgid0_list); 788 if (!list_empty(&group->pending_list) && group->state != MCAST_IDLE) 789 cancel_delayed_work_sync(&group->timeout_work); 790 791 list_for_each_entry_safe(tmp1, tmp2, &group->pending_list, group_list) { 792 list_del(&tmp1->group_list); 793 kfree(tmp1); 794 } 795 mutex_unlock(&group->lock); 796 mutex_unlock(&ctx->mcg_table_lock); 797 kfree(group); 798 return NULL; 799 } 800 } 801 mutex_unlock(&group->lock); 802 } 803 mutex_unlock(&ctx->mcg_table_lock); 804 805 return NULL; 806} 807 808static ssize_t sysfs_show_group(struct device *dev, 809 struct device_attribute *attr, char *buf); 810 811static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx, 812 union ib_gid *mgid, int create, 813 gfp_t gfp_mask) 814{ 815 struct mcast_group *group, *cur_group; 816 int is_mgid0; 817 int i; 818 819 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0); 820 if (!is_mgid0) { 821 group = mcast_find(ctx, mgid); 822 if (group) 823 goto found; 824 } 825 826 if (!create) 827 return ERR_PTR(-ENOENT); 828 829 group = kzalloc(sizeof *group, gfp_mask); 830 if (!group) 831 return ERR_PTR(-ENOMEM); 832 833 group->demux = ctx; 834 group->rec.mgid = *mgid; 835 INIT_LIST_HEAD(&group->pending_list); 836 INIT_LIST_HEAD(&group->mgid0_list); 837 for (i = 0; i < MAX_VFS; ++i) 838 INIT_LIST_HEAD(&group->func[i].pending); 839 INIT_WORK(&group->work, mlx4_ib_mcg_work_handler); 840 INIT_DELAYED_WORK(&group->timeout_work, mlx4_ib_mcg_timeout_handler); 841 mutex_init(&group->lock); 842 sprintf(group->name, "%016llx%016llx", 843 (long long)be64_to_cpu( 844 group->rec.mgid.global.subnet_prefix), 845 (long long)be64_to_cpu( 846 group->rec.mgid.global.interface_id)); 847 sysfs_attr_init(&group->dentry.attr); 848 group->dentry.show = sysfs_show_group; 849 group->dentry.store = NULL; 850 group->dentry.attr.name = group->name; 851 group->dentry.attr.mode = 0400; 852 group->state = MCAST_IDLE; 853 854 if (is_mgid0) { 855 list_add(&group->mgid0_list, &ctx->mcg_mgid0_list); 856 goto found; 857 } 858 859 cur_group = mcast_insert(ctx, group); 860 if (cur_group) { 861 mcg_warn("group just showed up %s - confused\n", cur_group->name); 862 kfree(group); 863 return ERR_PTR(-EINVAL); 864 } 865 866 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr); 867 868found: 869 atomic_inc(&group->refcount); 870 return group; 871} 872 873static void queue_req(struct mcast_req *req) 874{ 875 struct mcast_group *group = req->group; 876 877 atomic_inc(&group->refcount); /* for the request */ 878 atomic_inc(&group->refcount); /* for scheduling the work */ 879 list_add_tail(&req->group_list, &group->pending_list); 880 list_add_tail(&req->func_list, &group->func[req->func].pending); 881 /* calls mlx4_ib_mcg_work_handler */ 882 if (!queue_work(group->demux->mcg_wq, &group->work)) 883 safe_atomic_dec(&group->refcount); 884} 885 886int mlx4_ib_mcg_demux_handler(struct ib_device *ibdev, int port, int slave, 887 struct ib_sa_mad *mad) 888{ 889 struct mlx4_ib_dev *dev = to_mdev(ibdev); 890 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)mad->data; 891 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1]; 892 struct mcast_group *group; 893 894 switch (mad->mad_hdr.method) { 895 case IB_MGMT_METHOD_GET_RESP: 896 case IB_SA_METHOD_DELETE_RESP: 897 mutex_lock(&ctx->mcg_table_lock); 898 group = acquire_group(ctx, &rec->mgid, 0, GFP_KERNEL); 899 mutex_unlock(&ctx->mcg_table_lock); 900 if (IS_ERR(group)) { 901 if (mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP) { 902 __be64 tid = mad->mad_hdr.tid; 903 *(u8 *)(&tid) = (u8)slave; /* in group we kept the modified TID */ 904 group = search_relocate_mgid0_group(ctx, tid, &rec->mgid); 905 } else 906 group = NULL; 907 } 908 909 if (!group) 910 return 1; 911 912 mutex_lock(&group->lock); 913 group->response_sa_mad = *mad; 914 group->prev_state = group->state; 915 group->state = MCAST_RESP_READY; 916 /* calls mlx4_ib_mcg_work_handler */ 917 atomic_inc(&group->refcount); 918 if (!queue_work(ctx->mcg_wq, &group->work)) 919 safe_atomic_dec(&group->refcount); 920 mutex_unlock(&group->lock); 921 release_group(group, 0); 922 return 1; /* consumed */ 923 case IB_MGMT_METHOD_SET: 924 case IB_SA_METHOD_GET_TABLE: 925 case IB_SA_METHOD_GET_TABLE_RESP: 926 case IB_SA_METHOD_DELETE: 927 return 0; /* not consumed, pass-through to guest over tunnel */ 928 default: 929 mcg_warn("In demux, port %d: unexpected MCMember method: 0x%x, dropping\n", 930 port, mad->mad_hdr.method); 931 return 1; /* consumed */ 932 } 933} 934 935int mlx4_ib_mcg_multiplex_handler(struct ib_device *ibdev, int port, 936 int slave, struct ib_sa_mad *sa_mad) 937{ 938 struct mlx4_ib_dev *dev = to_mdev(ibdev); 939 struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)sa_mad->data; 940 struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1]; 941 struct mcast_group *group; 942 struct mcast_req *req; 943 int may_create = 0; 944 945 if (ctx->flushing) 946 return -EAGAIN; 947 948 switch (sa_mad->mad_hdr.method) { 949 case IB_MGMT_METHOD_SET: 950 may_create = 1; 951 case IB_SA_METHOD_DELETE: 952 req = kzalloc(sizeof *req, GFP_KERNEL); 953 if (!req) 954 return -ENOMEM; 955 956 req->func = slave; 957 req->sa_mad = *sa_mad; 958 959 mutex_lock(&ctx->mcg_table_lock); 960 group = acquire_group(ctx, &rec->mgid, may_create, GFP_KERNEL); 961 mutex_unlock(&ctx->mcg_table_lock); 962 if (IS_ERR(group)) { 963 kfree(req); 964 return PTR_ERR(group); 965 } 966 mutex_lock(&group->lock); 967 if (group->func[slave].num_pend_reqs > MAX_PEND_REQS_PER_FUNC) { 968 mutex_unlock(&group->lock); 969 mcg_debug_group(group, "Port %d, Func %d has too many pending requests (%d), dropping\n", 970 port, slave, MAX_PEND_REQS_PER_FUNC); 971 release_group(group, 0); 972 kfree(req); 973 return -ENOMEM; 974 } 975 ++group->func[slave].num_pend_reqs; 976 req->group = group; 977 queue_req(req); 978 mutex_unlock(&group->lock); 979 release_group(group, 0); 980 return 1; /* consumed */ 981 case IB_SA_METHOD_GET_TABLE: 982 case IB_MGMT_METHOD_GET_RESP: 983 case IB_SA_METHOD_GET_TABLE_RESP: 984 case IB_SA_METHOD_DELETE_RESP: 985 return 0; /* not consumed, pass-through */ 986 default: 987 mcg_warn("In multiplex, port %d, func %d: unexpected MCMember method: 0x%x, dropping\n", 988 port, slave, sa_mad->mad_hdr.method); 989 return 1; /* consumed */ 990 } 991} 992 993static ssize_t sysfs_show_group(struct device *dev, 994 struct device_attribute *attr, char *buf) 995{ 996 struct mcast_group *group = 997 container_of(attr, struct mcast_group, dentry); 998 struct mcast_req *req = NULL; 999 char pending_str[40]; 1000 char state_str[40]; 1001 ssize_t len = 0; 1002 int f; 1003 1004 if (group->state == MCAST_IDLE) 1005 sprintf(state_str, "%s", get_state_string(group->state)); 1006 else 1007 sprintf(state_str, "%s(TID=0x%llx)", 1008 get_state_string(group->state), 1009 (long long)be64_to_cpu(group->last_req_tid)); 1010 if (list_empty(&group->pending_list)) { 1011 sprintf(pending_str, "No"); 1012 } else { 1013 req = list_first_entry(&group->pending_list, struct mcast_req, group_list); 1014 sprintf(pending_str, "Yes(TID=0x%llx)", 1015 (long long)be64_to_cpu( 1016 req->sa_mad.mad_hdr.tid)); 1017 } 1018 len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s ", 1019 group->rec.scope_join_state & 0xf, 1020 group->members[2], group->members[1], group->members[0], 1021 atomic_read(&group->refcount), 1022 pending_str, 1023 state_str); 1024 for (f = 0; f < MAX_VFS; ++f) 1025 if (group->func[f].state == MCAST_MEMBER) 1026 len += sprintf(buf + len, "%d[%1x] ", 1027 f, group->func[f].join_state); 1028 1029 len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x " 1030 "%4x %4x %2x %2x)\n", 1031 be16_to_cpu(group->rec.pkey), 1032 be32_to_cpu(group->rec.qkey), 1033 (group->rec.mtusel_mtu & 0xc0) >> 6, 1034 group->rec.mtusel_mtu & 0x3f, 1035 group->rec.tclass, 1036 (group->rec.ratesel_rate & 0xc0) >> 6, 1037 group->rec.ratesel_rate & 0x3f, 1038 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28, 1039 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8, 1040 be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff, 1041 group->rec.proxy_join); 1042 1043 return len; 1044} 1045 1046int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx) 1047{ 1048 char name[20]; 1049 1050 atomic_set(&ctx->tid, 0); 1051 sprintf(name, "mlx4_ib_mcg%d", ctx->port); 1052 ctx->mcg_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM); 1053 if (!ctx->mcg_wq) 1054 return -ENOMEM; 1055 1056 mutex_init(&ctx->mcg_table_lock); 1057 ctx->mcg_table = RB_ROOT; 1058 INIT_LIST_HEAD(&ctx->mcg_mgid0_list); 1059 ctx->flushing = 0; 1060 1061 return 0; 1062} 1063 1064static void force_clean_group(struct mcast_group *group) 1065{ 1066 struct mcast_req *req, *tmp 1067 ; 1068 list_for_each_entry_safe(req, tmp, &group->pending_list, group_list) { 1069 list_del(&req->group_list); 1070 kfree(req); 1071 } 1072 del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr); 1073 rb_erase(&group->node, &group->demux->mcg_table); 1074 kfree(group); 1075} 1076 1077static void _mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) 1078{ 1079 int i; 1080 struct rb_node *p; 1081 struct mcast_group *group; 1082 unsigned long end; 1083 int count; 1084 1085 for (i = 0; i < MAX_VFS; ++i) 1086 clean_vf_mcast(ctx, i); 1087 1088 end = jiffies + msecs_to_jiffies(MAD_TIMEOUT_MS + 3000); 1089 do { 1090 count = 0; 1091 mutex_lock(&ctx->mcg_table_lock); 1092 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) 1093 ++count; 1094 mutex_unlock(&ctx->mcg_table_lock); 1095 if (!count) 1096 break; 1097 1098 msleep(1); 1099 } while (time_after(end, jiffies)); 1100 1101 flush_workqueue(ctx->mcg_wq); 1102 if (destroy_wq) 1103 destroy_workqueue(ctx->mcg_wq); 1104 1105 mutex_lock(&ctx->mcg_table_lock); 1106 while ((p = rb_first(&ctx->mcg_table)) != NULL) { 1107 group = rb_entry(p, struct mcast_group, node); 1108 if (atomic_read(&group->refcount)) 1109 mcg_warn_group(group, "group refcount %d!!! (pointer %p)\n", atomic_read(&group->refcount), group); 1110 1111 force_clean_group(group); 1112 } 1113 mutex_unlock(&ctx->mcg_table_lock); 1114} 1115 1116struct clean_work { 1117 struct work_struct work; 1118 struct mlx4_ib_demux_ctx *ctx; 1119 int destroy_wq; 1120}; 1121 1122static void mcg_clean_task(struct work_struct *work) 1123{ 1124 struct clean_work *cw = container_of(work, struct clean_work, work); 1125 1126 _mlx4_ib_mcg_port_cleanup(cw->ctx, cw->destroy_wq); 1127 cw->ctx->flushing = 0; 1128 kfree(cw); 1129} 1130 1131void mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq) 1132{ 1133 struct clean_work *work; 1134 1135 if (ctx->flushing) 1136 return; 1137 1138 ctx->flushing = 1; 1139 1140 if (destroy_wq) { 1141 _mlx4_ib_mcg_port_cleanup(ctx, destroy_wq); 1142 ctx->flushing = 0; 1143 return; 1144 } 1145 1146 work = kmalloc(sizeof *work, GFP_KERNEL); 1147 if (!work) { 1148 ctx->flushing = 0; 1149 mcg_warn("failed allocating work for cleanup\n"); 1150 return; 1151 } 1152 1153 work->ctx = ctx; 1154 work->destroy_wq = destroy_wq; 1155 INIT_WORK(&work->work, mcg_clean_task); 1156 queue_work(clean_wq, &work->work); 1157} 1158 1159static void build_leave_mad(struct mcast_req *req) 1160{ 1161 struct ib_sa_mad *mad = &req->sa_mad; 1162 1163 mad->mad_hdr.method = IB_SA_METHOD_DELETE; 1164} 1165 1166 1167static void clear_pending_reqs(struct mcast_group *group, int vf) 1168{ 1169 struct mcast_req *req, *tmp, *group_first = NULL; 1170 int clear; 1171 int pend = 0; 1172 1173 if (!list_empty(&group->pending_list)) 1174 group_first = list_first_entry(&group->pending_list, struct mcast_req, group_list); 1175 1176 list_for_each_entry_safe(req, tmp, &group->func[vf].pending, func_list) { 1177 clear = 1; 1178 if (group_first == req && 1179 (group->state == MCAST_JOIN_SENT || 1180 group->state == MCAST_LEAVE_SENT)) { 1181 clear = cancel_delayed_work(&group->timeout_work); 1182 pend = !clear; 1183 group->state = MCAST_IDLE; 1184 } 1185 if (clear) { 1186 --group->func[vf].num_pend_reqs; 1187 list_del(&req->group_list); 1188 list_del(&req->func_list); 1189 kfree(req); 1190 atomic_dec(&group->refcount); 1191 } 1192 } 1193 1194 if (!pend && (!list_empty(&group->func[vf].pending) || group->func[vf].num_pend_reqs)) { 1195 mcg_warn_group(group, "DRIVER BUG: list_empty %d, num_pend_reqs %d\n", 1196 list_empty(&group->func[vf].pending), group->func[vf].num_pend_reqs); 1197 } 1198} 1199 1200static int push_deleteing_req(struct mcast_group *group, int slave) 1201{ 1202 struct mcast_req *req; 1203 struct mcast_req *pend_req; 1204 1205 if (!group->func[slave].join_state) 1206 return 0; 1207 1208 req = kzalloc(sizeof *req, GFP_KERNEL); 1209 if (!req) { 1210 mcg_warn_group(group, "failed allocation - may leave stall groups\n"); 1211 return -ENOMEM; 1212 } 1213 1214 if (!list_empty(&group->func[slave].pending)) { 1215 pend_req = list_entry(group->func[slave].pending.prev, struct mcast_req, group_list); 1216 if (pend_req->clean) { 1217 kfree(req); 1218 return 0; 1219 } 1220 } 1221 1222 req->clean = 1; 1223 req->func = slave; 1224 req->group = group; 1225 ++group->func[slave].num_pend_reqs; 1226 build_leave_mad(req); 1227 queue_req(req); 1228 return 0; 1229} 1230 1231void clean_vf_mcast(struct mlx4_ib_demux_ctx *ctx, int slave) 1232{ 1233 struct mcast_group *group; 1234 struct rb_node *p; 1235 1236 mutex_lock(&ctx->mcg_table_lock); 1237 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) { 1238 group = rb_entry(p, struct mcast_group, node); 1239 mutex_lock(&group->lock); 1240 if (atomic_read(&group->refcount)) { 1241 /* clear pending requests of this VF */ 1242 clear_pending_reqs(group, slave); 1243 push_deleteing_req(group, slave); 1244 } 1245 mutex_unlock(&group->lock); 1246 } 1247 mutex_unlock(&ctx->mcg_table_lock); 1248} 1249 1250 1251int mlx4_ib_mcg_init(void) 1252{ 1253 clean_wq = alloc_ordered_workqueue("mlx4_ib_mcg", WQ_MEM_RECLAIM); 1254 if (!clean_wq) 1255 return -ENOMEM; 1256 1257 return 0; 1258} 1259 1260void mlx4_ib_mcg_destroy(void) 1261{ 1262 destroy_workqueue(clean_wq); 1263} 1264