drivers/infiniband/core/multicast.c

   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
  45 static void mcast_add_one(struct ib_device *device);
  46 static void mcast_remove_one(struct ib_device *device);
  47
  48 static struct ib_client mcast_client = {
  49         .name   = "ib_multicast",
  50         .add    = mcast_add_one,
  51         .remove = mcast_remove_one
  52 };
  53
  54 static struct ib_sa_client      sa_client;
  55 static struct workqueue_struct  *mcast_wq;
  56 static union ib_gid mgid0;
  57
  58 struct mcast_device;
  59
  60 struct 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
  69 struct 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
  77 enum mcast_state {
  78         MCAST_JOINING,
  79         MCAST_MEMBER,
  80         MCAST_ERROR,
  81 };
  82
  83 enum mcast_group_state {
  84         MCAST_IDLE,
  85         MCAST_BUSY,
  86         MCAST_GROUP_ERROR,
  87         MCAST_PKEY_EVENT
  88 };
  89
  90 enum {
  91         MCAST_INVALID_PKEY_INDEX = 0xFFFF
  92 };
  93
  94 struct mcast_member;
  95
  96 struct 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
 115 struct 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
 125 static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
 126                          void *context);
 127 static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
 128                           void *context);
 129
 130 static 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
 151 static 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
 180 static void deref_port(struct mcast_port *port)
 181 {
 182         if (atomic_dec_and_test(&port->refcount))
 183                 complete(&port->comp);
 184 }
 185
 186 static 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
 201 static void deref_member(struct mcast_member *member)
 202 {
 203         if (atomic_dec_and_test(&member->refcount))
 204                 complete(&member->comp);
 205 }
 206
 207 static 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  */
 228 static 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  */
 243 static 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
 255 static 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
 283 static 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
 330 static 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
 349 static 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
 373 static 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
 384 static 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
 393 static 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;
 427 out:
 428         group->state = MCAST_BUSY;
 429         spin_unlock_irq(&group->lock);
 430 }
 431
 432 static 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);
 441 retest:
 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  */
 499 static 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
 519 static 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                 int mgids_changed, is_mgid0;
 529                 ib_find_pkey(group->port->dev->device, group->port->port_num,
 530                              be16_to_cpu(rec->pkey), &pkey_index);
 531
 532                 spin_lock_irq(&group->port->lock);
 533                 if (group->state == MCAST_BUSY &&
 534                     group->pkey_index == MCAST_INVALID_PKEY_INDEX)
 535                         group->pkey_index = pkey_index;
 536                 mgids_changed = memcmp(&rec->mgid, &group->rec.mgid,
 537                                        sizeof(group->rec.mgid));
 538                 group->rec = *rec;
 539                 if (mgids_changed) {
 540                         rb_erase(&group->node, &group->port->table);
 541                         is_mgid0 = !memcmp(&mgid0, &group->rec.mgid,
 542                                            sizeof(mgid0));
 543                         mcast_insert(group->port, group, is_mgid0);
 544                 }
 545                 spin_unlock_irq(&group->port->lock);
 546         }
 547         mcast_work_handler(&group->work);
 548 }
 549
 550 static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
 551                           void *context)
 552 {
 553         struct mcast_group *group = context;
 554
 555         if (status && group->retries > 0 &&
 556             !send_leave(group, group->leave_state))
 557                 group->retries--;
 558         else
 559                 mcast_work_handler(&group->work);
 560 }
 561
 562 static struct mcast_group *acquire_group(struct mcast_port *port,
 563                                          union ib_gid *mgid, gfp_t gfp_mask)
 564 {
 565         struct mcast_group *group, *cur_group;
 566         unsigned long flags;
 567         int is_mgid0;
 568
 569         is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
 570         if (!is_mgid0) {
 571                 spin_lock_irqsave(&port->lock, flags);
 572                 group = mcast_find(port, mgid);
 573                 if (group)
 574                         goto found;
 575                 spin_unlock_irqrestore(&port->lock, flags);
 576         }
 577
 578         group = kzalloc(sizeof *group, gfp_mask);
 579         if (!group)
 580                 return NULL;
 581
 582         group->retries = 3;
 583         group->port = port;
 584         group->rec.mgid = *mgid;
 585         group->pkey_index = MCAST_INVALID_PKEY_INDEX;
 586         INIT_LIST_HEAD(&group->pending_list);
 587         INIT_LIST_HEAD(&group->active_list);
 588         INIT_WORK(&group->work, mcast_work_handler);
 589         spin_lock_init(&group->lock);
 590
 591         spin_lock_irqsave(&port->lock, flags);
 592         cur_group = mcast_insert(port, group, is_mgid0);
 593         if (cur_group) {
 594                 kfree(group);
 595                 group = cur_group;
 596         } else
 597                 atomic_inc(&port->refcount);
 598 found:
 599         atomic_inc(&group->refcount);
 600         spin_unlock_irqrestore(&port->lock, flags);
 601         return group;
 602 }
 603
 604 /*
 605  * We serialize all join requests to a single group to make our lives much
 606  * easier.  Otherwise, two users could try to join the same group
 607  * simultaneously, with different configurations, one could leave while the
 608  * join is in progress, etc., which makes locking around error recovery
 609  * difficult.
 610  */
 611 struct ib_sa_multicast *
 612 ib_sa_join_multicast(struct ib_sa_client *client,
 613                      struct ib_device *device, u8 port_num,
 614                      struct ib_sa_mcmember_rec *rec,
 615                      ib_sa_comp_mask comp_mask, gfp_t gfp_mask,
 616                      int (*callback)(int status,
 617                                      struct ib_sa_multicast *multicast),
 618                      void *context)
 619 {
 620         struct mcast_device *dev;
 621         struct mcast_member *member;
 622         struct ib_sa_multicast *multicast;
 623         int ret;
 624
 625         dev = ib_get_client_data(device, &mcast_client);
 626         if (!dev)
 627                 return ERR_PTR(-ENODEV);
 628
 629         member = kmalloc(sizeof *member, gfp_mask);
 630         if (!member)
 631                 return ERR_PTR(-ENOMEM);
 632
 633         ib_sa_client_get(client);
 634         member->client = client;
 635         member->multicast.rec = *rec;
 636         member->multicast.comp_mask = comp_mask;
 637         member->multicast.callback = callback;
 638         member->multicast.context = context;
 639         init_completion(&member->comp);
 640         atomic_set(&member->refcount, 1);
 641         member->state = MCAST_JOINING;
 642
 643         member->group = acquire_group(&dev->port[port_num - dev->start_port],
 644                                       &rec->mgid, gfp_mask);
 645         if (!member->group) {
 646                 ret = -ENOMEM;
 647                 goto err;
 648         }
 649
 650         /*
 651          * The user will get the multicast structure in their callback.  They
 652          * could then free the multicast structure before we can return from
 653          * this routine.  So we save the pointer to return before queuing
 654          * any callback.
 655          */
 656         multicast = &member->multicast;
 657         queue_join(member);
 658         return multicast;
 659
 660 err:
 661         ib_sa_client_put(client);
 662         kfree(member);
 663         return ERR_PTR(ret);
 664 }
 665 EXPORT_SYMBOL(ib_sa_join_multicast);
 666
 667 void ib_sa_free_multicast(struct ib_sa_multicast *multicast)
 668 {
 669         struct mcast_member *member;
 670         struct mcast_group *group;
 671
 672         member = container_of(multicast, struct mcast_member, multicast);
 673         group = member->group;
 674
 675         spin_lock_irq(&group->lock);
 676         if (member->state == MCAST_MEMBER)
 677                 adjust_membership(group, multicast->rec.join_state, -1);
 678
 679         list_del_init(&member->list);
 680
 681         if (group->state == MCAST_IDLE) {
 682                 group->state = MCAST_BUSY;
 683                 spin_unlock_irq(&group->lock);
 684                 /* Continue to hold reference on group until callback */
 685                 queue_work(mcast_wq, &group->work);
 686         } else {
 687                 spin_unlock_irq(&group->lock);
 688                 release_group(group);
 689         }
 690
 691         deref_member(member);
 692         wait_for_completion(&member->comp);
 693         ib_sa_client_put(member->client);
 694         kfree(member);
 695 }
 696 EXPORT_SYMBOL(ib_sa_free_multicast);
 697
 698 int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num,
 699                            union ib_gid *mgid, struct ib_sa_mcmember_rec *rec)
 700 {
 701         struct mcast_device *dev;
 702         struct mcast_port *port;
 703         struct mcast_group *group;
 704         unsigned long flags;
 705         int ret = 0;
 706
 707         dev = ib_get_client_data(device, &mcast_client);
 708         if (!dev)
 709                 return -ENODEV;
 710
 711         port = &dev->port[port_num - dev->start_port];
 712         spin_lock_irqsave(&port->lock, flags);
 713         group = mcast_find(port, mgid);
 714         if (group)
 715                 *rec = group->rec;
 716         else
 717                 ret = -EADDRNOTAVAIL;
 718         spin_unlock_irqrestore(&port->lock, flags);
 719
 720         return ret;
 721 }
 722 EXPORT_SYMBOL(ib_sa_get_mcmember_rec);
 723
 724 int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num,
 725                              struct ib_sa_mcmember_rec *rec,
 726                              struct ib_ah_attr *ah_attr)
 727 {
 728         int ret;
 729         u16 gid_index;
 730         u8 p;
 731
 732         ret = ib_find_cached_gid(device, &rec->port_gid, &p, &gid_index);
 733         if (ret)
 734                 return ret;
 735
 736         memset(ah_attr, 0, sizeof *ah_attr);
 737         ah_attr->dlid = be16_to_cpu(rec->mlid);
 738         ah_attr->sl = rec->sl;
 739         ah_attr->port_num = port_num;
 740         ah_attr->static_rate = rec->rate;
 741
 742         ah_attr->ah_flags = IB_AH_GRH;
 743         ah_attr->grh.dgid = rec->mgid;
 744
 745         ah_attr->grh.sgid_index = (u8) gid_index;
 746         ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
 747         ah_attr->grh.hop_limit = rec->hop_limit;
 748         ah_attr->grh.traffic_class = rec->traffic_class;
 749
 750         return 0;
 751 }
 752 EXPORT_SYMBOL(ib_init_ah_from_mcmember);
 753
 754 static void mcast_groups_event(struct mcast_port *port,
 755                                enum mcast_group_state state)
 756 {
 757         struct mcast_group *group;
 758         struct rb_node *node;
 759         unsigned long flags;
 760
 761         spin_lock_irqsave(&port->lock, flags);
 762         for (node = rb_first(&port->table); node; node = rb_next(node)) {
 763                 group = rb_entry(node, struct mcast_group, node);
 764                 spin_lock(&group->lock);
 765                 if (group->state == MCAST_IDLE) {
 766                         atomic_inc(&group->refcount);
 767                         queue_work(mcast_wq, &group->work);
 768                 }
 769                 if (group->state != MCAST_GROUP_ERROR)
 770                         group->state = state;
 771                 spin_unlock(&group->lock);
 772         }
 773         spin_unlock_irqrestore(&port->lock, flags);
 774 }
 775
 776 static void mcast_event_handler(struct ib_event_handler *handler,
 777                                 struct ib_event *event)
 778 {
 779         struct mcast_device *dev;
 780         int index;
 781
 782         dev = container_of(handler, struct mcast_device, event_handler);
 783         if (!rdma_cap_ib_mcast(dev->device, event->element.port_num))
 784                 return;
 785
 786         index = event->element.port_num - dev->start_port;
 787
 788         switch (event->event) {
 789         case IB_EVENT_PORT_ERR:
 790         case IB_EVENT_LID_CHANGE:
 791         case IB_EVENT_SM_CHANGE:
 792         case IB_EVENT_CLIENT_REREGISTER:
 793                 mcast_groups_event(&dev->port[index], MCAST_GROUP_ERROR);
 794                 break;
 795         case IB_EVENT_PKEY_CHANGE:
 796                 mcast_groups_event(&dev->port[index], MCAST_PKEY_EVENT);
 797                 break;
 798         default:
 799                 break;
 800         }
 801 }
 802
 803 static void mcast_add_one(struct ib_device *device)
 804 {
 805         struct mcast_device *dev;
 806         struct mcast_port *port;
 807         int i;
 808         int count = 0;
 809
 810         dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
 811                       GFP_KERNEL);
 812         if (!dev)
 813                 return;
 814
 815         dev->start_port = rdma_start_port(device);
 816         dev->end_port = rdma_end_port(device);
 817
 818         for (i = 0; i <= dev->end_port - dev->start_port; i++) {
 819                 if (!rdma_cap_ib_mcast(device, dev->start_port + i))
 820                         continue;
 821                 port = &dev->port[i];
 822                 port->dev = dev;
 823                 port->port_num = dev->start_port + i;
 824                 spin_lock_init(&port->lock);
 825                 port->table = RB_ROOT;
 826                 init_completion(&port->comp);
 827                 atomic_set(&port->refcount, 1);
 828                 ++count;
 829         }
 830
 831         if (!count) {
 832                 kfree(dev);
 833                 return;
 834         }
 835
 836         dev->device = device;
 837         ib_set_client_data(device, &mcast_client, dev);
 838
 839         INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler);
 840         ib_register_event_handler(&dev->event_handler);
 841 }
 842
 843 static void mcast_remove_one(struct ib_device *device)
 844 {
 845         struct mcast_device *dev;
 846         struct mcast_port *port;
 847         int i;
 848
 849         dev = ib_get_client_data(device, &mcast_client);
 850         if (!dev)
 851                 return;
 852
 853         ib_unregister_event_handler(&dev->event_handler);
 854         flush_workqueue(mcast_wq);
 855
 856         for (i = 0; i <= dev->end_port - dev->start_port; i++) {
 857                 if (rdma_cap_ib_mcast(device, dev->start_port + i)) {
 858                         port = &dev->port[i];
 859                         deref_port(port);
 860                         wait_for_completion(&port->comp);
 861                 }
 862         }
 863
 864         kfree(dev);
 865 }
 866
 867 int mcast_init(void)
 868 {
 869         int ret;
 870
 871         mcast_wq = create_singlethread_workqueue("ib_mcast");
 872         if (!mcast_wq)
 873                 return -ENOMEM;
 874
 875         ib_sa_register_client(&sa_client);
 876
 877         ret = ib_register_client(&mcast_client);
 878         if (ret)
 879                 goto err;
 880         return 0;
 881
 882 err:
 883         ib_sa_unregister_client(&sa_client);
 884         destroy_workqueue(mcast_wq);
 885         return ret;
 886 }
 887
 888 void mcast_cleanup(void)
 889 {
 890         ib_unregister_client(&mcast_client);
 891         ib_sa_unregister_client(&sa_client);
 892         destroy_workqueue(mcast_wq);
 893 }