1/* 2 * Copyright (c) 2006 Intel Corporation. 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 <linux/completion.h> 34#include <linux/dma-mapping.h> 35#include <linux/err.h> 36#include <linux/interrupt.h> 37#include <linux/export.h> 38#include <linux/slab.h> 39#include <linux/bitops.h> 40#include <linux/random.h> 41 42#include <rdma/ib_cache.h> 43#include "sa.h" 44 45static void mcast_add_one(struct ib_device *device); 46static void mcast_remove_one(struct ib_device *device); 47 48static struct ib_client mcast_client = { 49 .name = "ib_multicast", 50 .add = mcast_add_one, 51 .remove = mcast_remove_one 52}; 53 54static struct ib_sa_client sa_client; 55static struct workqueue_struct *mcast_wq; 56static union ib_gid mgid0; 57 58struct mcast_device; 59 60struct mcast_port { 61 struct mcast_device *dev; 62 spinlock_t lock; 63 struct rb_root table; 64 atomic_t refcount; 65 struct completion comp; 66 u8 port_num; 67}; 68 69struct mcast_device { 70 struct ib_device *device; 71 struct ib_event_handler event_handler; 72 int start_port; 73 int end_port; 74 struct mcast_port port[0]; 75}; 76 77enum mcast_state { 78 MCAST_JOINING, 79 MCAST_MEMBER, 80 MCAST_ERROR, 81}; 82 83enum mcast_group_state { 84 MCAST_IDLE, 85 MCAST_BUSY, 86 MCAST_GROUP_ERROR, 87 MCAST_PKEY_EVENT 88}; 89 90enum { 91 MCAST_INVALID_PKEY_INDEX = 0xFFFF 92}; 93 94struct mcast_member; 95 96struct mcast_group { 97 struct ib_sa_mcmember_rec rec; 98 struct rb_node node; 99 struct mcast_port *port; 100 spinlock_t lock; 101 struct work_struct work; 102 struct list_head pending_list; 103 struct list_head active_list; 104 struct mcast_member *last_join; 105 int members[3]; 106 atomic_t refcount; 107 enum mcast_group_state state; 108 struct ib_sa_query *query; 109 int query_id; 110 u16 pkey_index; 111 u8 leave_state; 112 int retries; 113}; 114 115struct mcast_member { 116 struct ib_sa_multicast multicast; 117 struct ib_sa_client *client; 118 struct mcast_group *group; 119 struct list_head list; 120 enum mcast_state state; 121 atomic_t refcount; 122 struct completion comp; 123}; 124 125static void join_handler(int status, struct ib_sa_mcmember_rec *rec, 126 void *context); 127static void leave_handler(int status, struct ib_sa_mcmember_rec *rec, 128 void *context); 129 130static struct mcast_group *mcast_find(struct mcast_port *port, 131 union ib_gid *mgid) 132{ 133 struct rb_node *node = port->table.rb_node; 134 struct mcast_group *group; 135 int ret; 136 137 while (node) { 138 group = rb_entry(node, struct mcast_group, node); 139 ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid); 140 if (!ret) 141 return group; 142 143 if (ret < 0) 144 node = node->rb_left; 145 else 146 node = node->rb_right; 147 } 148 return NULL; 149} 150 151static struct mcast_group *mcast_insert(struct mcast_port *port, 152 struct mcast_group *group, 153 int allow_duplicates) 154{ 155 struct rb_node **link = &port->table.rb_node; 156 struct rb_node *parent = NULL; 157 struct mcast_group *cur_group; 158 int ret; 159 160 while (*link) { 161 parent = *link; 162 cur_group = rb_entry(parent, struct mcast_group, node); 163 164 ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw, 165 sizeof group->rec.mgid); 166 if (ret < 0) 167 link = &(*link)->rb_left; 168 else if (ret > 0) 169 link = &(*link)->rb_right; 170 else if (allow_duplicates) 171 link = &(*link)->rb_left; 172 else 173 return cur_group; 174 } 175 rb_link_node(&group->node, parent, link); 176 rb_insert_color(&group->node, &port->table); 177 return NULL; 178} 179 180static void deref_port(struct mcast_port *port) 181{ 182 if (atomic_dec_and_test(&port->refcount)) 183 complete(&port->comp); 184} 185 186static void release_group(struct mcast_group *group) 187{ 188 struct mcast_port *port = group->port; 189 unsigned long flags; 190 191 spin_lock_irqsave(&port->lock, flags); 192 if (atomic_dec_and_test(&group->refcount)) { 193 rb_erase(&group->node, &port->table); 194 spin_unlock_irqrestore(&port->lock, flags); 195 kfree(group); 196 deref_port(port); 197 } else 198 spin_unlock_irqrestore(&port->lock, flags); 199} 200 201static void deref_member(struct mcast_member *member) 202{ 203 if (atomic_dec_and_test(&member->refcount)) 204 complete(&member->comp); 205} 206 207static void queue_join(struct mcast_member *member) 208{ 209 struct mcast_group *group = member->group; 210 unsigned long flags; 211 212 spin_lock_irqsave(&group->lock, flags); 213 list_add_tail(&member->list, &group->pending_list); 214 if (group->state == MCAST_IDLE) { 215 group->state = MCAST_BUSY; 216 atomic_inc(&group->refcount); 217 queue_work(mcast_wq, &group->work); 218 } 219 spin_unlock_irqrestore(&group->lock, flags); 220} 221 222/* 223 * A multicast group has three types of members: full member, non member, and 224 * send only member. We need to keep track of the number of members of each 225 * type based on their join state. Adjust the number of members the belong to 226 * the specified join states. 227 */ 228static void adjust_membership(struct mcast_group *group, u8 join_state, int inc) 229{ 230 int i; 231 232 for (i = 0; i < 3; i++, join_state >>= 1) 233 if (join_state & 0x1) 234 group->members[i] += inc; 235} 236 237/* 238 * If a multicast group has zero members left for a particular join state, but 239 * the group is still a member with the SA, we need to leave that join state. 240 * Determine which join states we still belong to, but that do not have any 241 * active members. 242 */ 243static u8 get_leave_state(struct mcast_group *group) 244{ 245 u8 leave_state = 0; 246 int i; 247 248 for (i = 0; i < 3; i++) 249 if (!group->members[i]) 250 leave_state |= (0x1 << i); 251 252 return leave_state & group->rec.join_state; 253} 254 255static int check_selector(ib_sa_comp_mask comp_mask, 256 ib_sa_comp_mask selector_mask, 257 ib_sa_comp_mask value_mask, 258 u8 selector, u8 src_value, u8 dst_value) 259{ 260 int err; 261 262 if (!(comp_mask & selector_mask) || !(comp_mask & value_mask)) 263 return 0; 264 265 switch (selector) { 266 case IB_SA_GT: 267 err = (src_value <= dst_value); 268 break; 269 case IB_SA_LT: 270 err = (src_value >= dst_value); 271 break; 272 case IB_SA_EQ: 273 err = (src_value != dst_value); 274 break; 275 default: 276 err = 0; 277 break; 278 } 279 280 return err; 281} 282 283static int cmp_rec(struct ib_sa_mcmember_rec *src, 284 struct ib_sa_mcmember_rec *dst, ib_sa_comp_mask comp_mask) 285{ 286 /* MGID must already match */ 287 288 if (comp_mask & IB_SA_MCMEMBER_REC_PORT_GID && 289 memcmp(&src->port_gid, &dst->port_gid, sizeof src->port_gid)) 290 return -EINVAL; 291 if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey) 292 return -EINVAL; 293 if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid) 294 return -EINVAL; 295 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR, 296 IB_SA_MCMEMBER_REC_MTU, dst->mtu_selector, 297 src->mtu, dst->mtu)) 298 return -EINVAL; 299 if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS && 300 src->traffic_class != dst->traffic_class) 301 return -EINVAL; 302 if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey) 303 return -EINVAL; 304 if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR, 305 IB_SA_MCMEMBER_REC_RATE, dst->rate_selector, 306 src->rate, dst->rate)) 307 return -EINVAL; 308 if (check_selector(comp_mask, 309 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR, 310 IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME, 311 dst->packet_life_time_selector, 312 src->packet_life_time, dst->packet_life_time)) 313 return -EINVAL; 314 if (comp_mask & IB_SA_MCMEMBER_REC_SL && src->sl != dst->sl) 315 return -EINVAL; 316 if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL && 317 src->flow_label != dst->flow_label) 318 return -EINVAL; 319 if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT && 320 src->hop_limit != dst->hop_limit) 321 return -EINVAL; 322 if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && src->scope != dst->scope) 323 return -EINVAL; 324 325 /* join_state checked separately, proxy_join ignored */ 326 327 return 0; 328} 329 330static int send_join(struct mcast_group *group, struct mcast_member *member) 331{ 332 struct mcast_port *port = group->port; 333 int ret; 334 335 group->last_join = member; 336 ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device, 337 port->port_num, IB_MGMT_METHOD_SET, 338 &member->multicast.rec, 339 member->multicast.comp_mask, 340 3000, GFP_KERNEL, join_handler, group, 341 &group->query); 342 if (ret >= 0) { 343 group->query_id = ret; 344 ret = 0; 345 } 346 return ret; 347} 348 349static int send_leave(struct mcast_group *group, u8 leave_state) 350{ 351 struct mcast_port *port = group->port; 352 struct ib_sa_mcmember_rec rec; 353 int ret; 354 355 rec = group->rec; 356 rec.join_state = leave_state; 357 group->leave_state = leave_state; 358 359 ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device, 360 port->port_num, IB_SA_METHOD_DELETE, &rec, 361 IB_SA_MCMEMBER_REC_MGID | 362 IB_SA_MCMEMBER_REC_PORT_GID | 363 IB_SA_MCMEMBER_REC_JOIN_STATE, 364 3000, GFP_KERNEL, leave_handler, 365 group, &group->query); 366 if (ret >= 0) { 367 group->query_id = ret; 368 ret = 0; 369 } 370 return ret; 371} 372 373static void join_group(struct mcast_group *group, struct mcast_member *member, 374 u8 join_state) 375{ 376 member->state = MCAST_MEMBER; 377 adjust_membership(group, join_state, 1); 378 group->rec.join_state |= join_state; 379 member->multicast.rec = group->rec; 380 member->multicast.rec.join_state = join_state; 381 list_move(&member->list, &group->active_list); 382} 383 384static int fail_join(struct mcast_group *group, struct mcast_member *member, 385 int status) 386{ 387 spin_lock_irq(&group->lock); 388 list_del_init(&member->list); 389 spin_unlock_irq(&group->lock); 390 return member->multicast.callback(status, &member->multicast); 391} 392 393static void process_group_error(struct mcast_group *group) 394{ 395 struct mcast_member *member; 396 int ret = 0; 397 u16 pkey_index; 398 399 if (group->state == MCAST_PKEY_EVENT) 400 ret = ib_find_pkey(group->port->dev->device, 401 group->port->port_num, 402 be16_to_cpu(group->rec.pkey), &pkey_index); 403 404 spin_lock_irq(&group->lock); 405 if (group->state == MCAST_PKEY_EVENT && !ret && 406 group->pkey_index == pkey_index) 407 goto out; 408 409 while (!list_empty(&group->active_list)) { 410 member = list_entry(group->active_list.next, 411 struct mcast_member, list); 412 atomic_inc(&member->refcount); 413 list_del_init(&member->list); 414 adjust_membership(group, member->multicast.rec.join_state, -1); 415 member->state = MCAST_ERROR; 416 spin_unlock_irq(&group->lock); 417 418 ret = member->multicast.callback(-ENETRESET, 419 &member->multicast); 420 deref_member(member); 421 if (ret) 422 ib_sa_free_multicast(&member->multicast); 423 spin_lock_irq(&group->lock); 424 } 425 426 group->rec.join_state = 0; 427out: 428 group->state = MCAST_BUSY; 429 spin_unlock_irq(&group->lock); 430} 431 432static void mcast_work_handler(struct work_struct *work) 433{ 434 struct mcast_group *group; 435 struct mcast_member *member; 436 struct ib_sa_multicast *multicast; 437 int status, ret; 438 u8 join_state; 439 440 group = container_of(work, typeof(*group), work); 441retest: 442 spin_lock_irq(&group->lock); 443 while (!list_empty(&group->pending_list) || 444 (group->state != MCAST_BUSY)) { 445 446 if (group->state != MCAST_BUSY) { 447 spin_unlock_irq(&group->lock); 448 process_group_error(group); 449 goto retest; 450 } 451 452 member = list_entry(group->pending_list.next, 453 struct mcast_member, list); 454 multicast = &member->multicast; 455 join_state = multicast->rec.join_state; 456 atomic_inc(&member->refcount); 457 458 if (join_state == (group->rec.join_state & join_state)) { 459 status = cmp_rec(&group->rec, &multicast->rec, 460 multicast->comp_mask); 461 if (!status) 462 join_group(group, member, join_state); 463 else 464 list_del_init(&member->list); 465 spin_unlock_irq(&group->lock); 466 ret = multicast->callback(status, multicast); 467 } else { 468 spin_unlock_irq(&group->lock); 469 status = send_join(group, member); 470 if (!status) { 471 deref_member(member); 472 return; 473 } 474 ret = fail_join(group, member, status); 475 } 476 477 deref_member(member); 478 if (ret) 479 ib_sa_free_multicast(&member->multicast); 480 spin_lock_irq(&group->lock); 481 } 482 483 join_state = get_leave_state(group); 484 if (join_state) { 485 group->rec.join_state &= ~join_state; 486 spin_unlock_irq(&group->lock); 487 if (send_leave(group, join_state)) 488 goto retest; 489 } else { 490 group->state = MCAST_IDLE; 491 spin_unlock_irq(&group->lock); 492 release_group(group); 493 } 494} 495 496/* 497 * Fail a join request if it is still active - at the head of the pending queue. 498 */ 499static void process_join_error(struct mcast_group *group, int status) 500{ 501 struct mcast_member *member; 502 int ret; 503 504 spin_lock_irq(&group->lock); 505 member = list_entry(group->pending_list.next, 506 struct mcast_member, list); 507 if (group->last_join == member) { 508 atomic_inc(&member->refcount); 509 list_del_init(&member->list); 510 spin_unlock_irq(&group->lock); 511 ret = member->multicast.callback(status, &member->multicast); 512 deref_member(member); 513 if (ret) 514 ib_sa_free_multicast(&member->multicast); 515 } else 516 spin_unlock_irq(&group->lock); 517} 518 519static void join_handler(int status, struct ib_sa_mcmember_rec *rec, 520 void *context) 521{ 522 struct mcast_group *group = context; 523 u16 pkey_index = MCAST_INVALID_PKEY_INDEX; 524 525 if (status) 526 process_join_error(group, status); 527 else { 528 ib_find_pkey(group->port->dev->device, group->port->port_num, 529 be16_to_cpu(rec->pkey), &pkey_index); 530 531 spin_lock_irq(&group->port->lock); 532 group->rec = *rec; 533 if (group->state == MCAST_BUSY && 534 group->pkey_index == MCAST_INVALID_PKEY_INDEX) 535 group->pkey_index = pkey_index; 536 if (!memcmp(&mgid0, &group->rec.mgid, sizeof mgid0)) { 537 rb_erase(&group->node, &group->port->table); 538 mcast_insert(group->port, group, 1); 539 } 540 spin_unlock_irq(&group->port->lock); 541 } 542 mcast_work_handler(&group->work); 543} 544 545static void leave_handler(int status, struct ib_sa_mcmember_rec *rec, 546 void *context) 547{ 548 struct mcast_group *group = context; 549 550 if (status && group->retries > 0 && 551 !send_leave(group, group->leave_state)) 552 group->retries--; 553 else 554 mcast_work_handler(&group->work); 555} 556 557static struct mcast_group *acquire_group(struct mcast_port *port, 558 union ib_gid *mgid, gfp_t gfp_mask) 559{ 560 struct mcast_group *group, *cur_group; 561 unsigned long flags; 562 int is_mgid0; 563 564 is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0); 565 if (!is_mgid0) { 566 spin_lock_irqsave(&port->lock, flags); 567 group = mcast_find(port, mgid); 568 if (group) 569 goto found; 570 spin_unlock_irqrestore(&port->lock, flags); 571 } 572 573 group = kzalloc(sizeof *group, gfp_mask); 574 if (!group) 575 return NULL; 576 577 group->retries = 3; 578 group->port = port; 579 group->rec.mgid = *mgid; 580 group->pkey_index = MCAST_INVALID_PKEY_INDEX; 581 INIT_LIST_HEAD(&group->pending_list); 582 INIT_LIST_HEAD(&group->active_list); 583 INIT_WORK(&group->work, mcast_work_handler); 584 spin_lock_init(&group->lock); 585 586 spin_lock_irqsave(&port->lock, flags); 587 cur_group = mcast_insert(port, group, is_mgid0); 588 if (cur_group) { 589 kfree(group); 590 group = cur_group; 591 } else 592 atomic_inc(&port->refcount); 593found: 594 atomic_inc(&group->refcount); 595 spin_unlock_irqrestore(&port->lock, flags); 596 return group; 597} 598 599/* 600 * We serialize all join requests to a single group to make our lives much 601 * easier. Otherwise, two users could try to join the same group 602 * simultaneously, with different configurations, one could leave while the 603 * join is in progress, etc., which makes locking around error recovery 604 * difficult. 605 */ 606struct ib_sa_multicast * 607ib_sa_join_multicast(struct ib_sa_client *client, 608 struct ib_device *device, u8 port_num, 609 struct ib_sa_mcmember_rec *rec, 610 ib_sa_comp_mask comp_mask, gfp_t gfp_mask, 611 int (*callback)(int status, 612 struct ib_sa_multicast *multicast), 613 void *context) 614{ 615 struct mcast_device *dev; 616 struct mcast_member *member; 617 struct ib_sa_multicast *multicast; 618 int ret; 619 620 dev = ib_get_client_data(device, &mcast_client); 621 if (!dev) 622 return ERR_PTR(-ENODEV); 623 624 member = kmalloc(sizeof *member, gfp_mask); 625 if (!member) 626 return ERR_PTR(-ENOMEM); 627 628 ib_sa_client_get(client); 629 member->client = client; 630 member->multicast.rec = *rec; 631 member->multicast.comp_mask = comp_mask; 632 member->multicast.callback = callback; 633 member->multicast.context = context; 634 init_completion(&member->comp); 635 atomic_set(&member->refcount, 1); 636 member->state = MCAST_JOINING; 637 638 member->group = acquire_group(&dev->port[port_num - dev->start_port], 639 &rec->mgid, gfp_mask); 640 if (!member->group) { 641 ret = -ENOMEM; 642 goto err; 643 } 644 645 /* 646 * The user will get the multicast structure in their callback. They 647 * could then free the multicast structure before we can return from 648 * this routine. So we save the pointer to return before queuing 649 * any callback. 650 */ 651 multicast = &member->multicast; 652 queue_join(member); 653 return multicast; 654 655err: 656 ib_sa_client_put(client); 657 kfree(member); 658 return ERR_PTR(ret); 659} 660EXPORT_SYMBOL(ib_sa_join_multicast); 661 662void ib_sa_free_multicast(struct ib_sa_multicast *multicast) 663{ 664 struct mcast_member *member; 665 struct mcast_group *group; 666 667 member = container_of(multicast, struct mcast_member, multicast); 668 group = member->group; 669 670 spin_lock_irq(&group->lock); 671 if (member->state == MCAST_MEMBER) 672 adjust_membership(group, multicast->rec.join_state, -1); 673 674 list_del_init(&member->list); 675 676 if (group->state == MCAST_IDLE) { 677 group->state = MCAST_BUSY; 678 spin_unlock_irq(&group->lock); 679 /* Continue to hold reference on group until callback */ 680 queue_work(mcast_wq, &group->work); 681 } else { 682 spin_unlock_irq(&group->lock); 683 release_group(group); 684 } 685 686 deref_member(member); 687 wait_for_completion(&member->comp); 688 ib_sa_client_put(member->client); 689 kfree(member); 690} 691EXPORT_SYMBOL(ib_sa_free_multicast); 692 693int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num, 694 union ib_gid *mgid, struct ib_sa_mcmember_rec *rec) 695{ 696 struct mcast_device *dev; 697 struct mcast_port *port; 698 struct mcast_group *group; 699 unsigned long flags; 700 int ret = 0; 701 702 dev = ib_get_client_data(device, &mcast_client); 703 if (!dev) 704 return -ENODEV; 705 706 port = &dev->port[port_num - dev->start_port]; 707 spin_lock_irqsave(&port->lock, flags); 708 group = mcast_find(port, mgid); 709 if (group) 710 *rec = group->rec; 711 else 712 ret = -EADDRNOTAVAIL; 713 spin_unlock_irqrestore(&port->lock, flags); 714 715 return ret; 716} 717EXPORT_SYMBOL(ib_sa_get_mcmember_rec); 718 719int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num, 720 struct ib_sa_mcmember_rec *rec, 721 struct ib_ah_attr *ah_attr) 722{ 723 int ret; 724 u16 gid_index; 725 u8 p; 726 727 ret = ib_find_cached_gid(device, &rec->port_gid, &p, &gid_index); 728 if (ret) 729 return ret; 730 731 memset(ah_attr, 0, sizeof *ah_attr); 732 ah_attr->dlid = be16_to_cpu(rec->mlid); 733 ah_attr->sl = rec->sl; 734 ah_attr->port_num = port_num; 735 ah_attr->static_rate = rec->rate; 736 737 ah_attr->ah_flags = IB_AH_GRH; 738 ah_attr->grh.dgid = rec->mgid; 739 740 ah_attr->grh.sgid_index = (u8) gid_index; 741 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label); 742 ah_attr->grh.hop_limit = rec->hop_limit; 743 ah_attr->grh.traffic_class = rec->traffic_class; 744 745 return 0; 746} 747EXPORT_SYMBOL(ib_init_ah_from_mcmember); 748 749static void mcast_groups_event(struct mcast_port *port, 750 enum mcast_group_state state) 751{ 752 struct mcast_group *group; 753 struct rb_node *node; 754 unsigned long flags; 755 756 spin_lock_irqsave(&port->lock, flags); 757 for (node = rb_first(&port->table); node; node = rb_next(node)) { 758 group = rb_entry(node, struct mcast_group, node); 759 spin_lock(&group->lock); 760 if (group->state == MCAST_IDLE) { 761 atomic_inc(&group->refcount); 762 queue_work(mcast_wq, &group->work); 763 } 764 if (group->state != MCAST_GROUP_ERROR) 765 group->state = state; 766 spin_unlock(&group->lock); 767 } 768 spin_unlock_irqrestore(&port->lock, flags); 769} 770 771static void mcast_event_handler(struct ib_event_handler *handler, 772 struct ib_event *event) 773{ 774 struct mcast_device *dev; 775 int index; 776 777 dev = container_of(handler, struct mcast_device, event_handler); 778 if (rdma_port_get_link_layer(dev->device, event->element.port_num) != 779 IB_LINK_LAYER_INFINIBAND) 780 return; 781 782 index = event->element.port_num - dev->start_port; 783 784 switch (event->event) { 785 case IB_EVENT_PORT_ERR: 786 case IB_EVENT_LID_CHANGE: 787 case IB_EVENT_SM_CHANGE: 788 case IB_EVENT_CLIENT_REREGISTER: 789 mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR); 790 break; 791 case IB_EVENT_PKEY_CHANGE: 792 mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT); 793 break; 794 default: 795 break; 796 } 797} 798 799static void mcast_add_one(struct ib_device *device) 800{ 801 struct mcast_device *dev; 802 struct mcast_port *port; 803 int i; 804 int count = 0; 805 806 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 807 return; 808 809 dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port, 810 GFP_KERNEL); 811 if (!dev) 812 return; 813 814 if (device->node_type == RDMA_NODE_IB_SWITCH) 815 dev->start_port = dev->end_port = 0; 816 else { 817 dev->start_port = 1; 818 dev->end_port = device->phys_port_cnt; 819 } 820 821 for (i = 0; i <= dev->end_port - dev->start_port; i++) { 822 if (rdma_port_get_link_layer(device, dev->start_port + i) != 823 IB_LINK_LAYER_INFINIBAND) 824 continue; 825 port = &dev->port[i]; 826 port->dev = dev; 827 port->port_num = dev->start_port + i; 828 spin_lock_init(&port->lock); 829 port->table = RB_ROOT; 830 init_completion(&port->comp); 831 atomic_set(&port->refcount, 1); 832 ++count; 833 } 834 835 if (!count) { 836 kfree(dev); 837 return; 838 } 839 840 dev->device = device; 841 ib_set_client_data(device, &mcast_client, dev); 842 843 INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler); 844 ib_register_event_handler(&dev->event_handler); 845} 846 847static void mcast_remove_one(struct ib_device *device) 848{ 849 struct mcast_device *dev; 850 struct mcast_port *port; 851 int i; 852 853 dev = ib_get_client_data(device, &mcast_client); 854 if (!dev) 855 return; 856 857 ib_unregister_event_handler(&dev->event_handler); 858 flush_workqueue(mcast_wq); 859 860 for (i = 0; i <= dev->end_port - dev->start_port; i++) { 861 if (rdma_port_get_link_layer(device, dev->start_port + i) == 862 IB_LINK_LAYER_INFINIBAND) { 863 port = &dev->port[i]; 864 deref_port(port); 865 wait_for_completion(&port->comp); 866 } 867 } 868 869 kfree(dev); 870} 871 872int mcast_init(void) 873{ 874 int ret; 875 876 mcast_wq = create_singlethread_workqueue("ib_mcast"); 877 if (!mcast_wq) 878 return -ENOMEM; 879 880 ib_sa_register_client(&sa_client); 881 882 ret = ib_register_client(&mcast_client); 883 if (ret) 884 goto err; 885 return 0; 886 887err: 888 ib_sa_unregister_client(&sa_client); 889 destroy_workqueue(mcast_wq); 890 return ret; 891} 892 893void mcast_cleanup(void) 894{ 895 ib_unregister_client(&mcast_client); 896 ib_sa_unregister_client(&sa_client); 897 destroy_workqueue(mcast_wq); 898} 899