drivers/infiniband/hw/mlx4/mcg.c

   1 /*
   2  * Copyright (c) 2012 Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <rdma/ib_mad.h>
  34 #include <rdma/ib_smi.h>
  35 #include <rdma/ib_cache.h>
  36 #include <rdma/ib_sa.h>
  37
  38 #include <linux/mlx4/cmd.h>
  39 #include <linux/rbtree.h>
  40 #include <linux/delay.h>
  41
  42 #include "mlx4_ib.h"
  43
  44 #define MAX_VFS         80
  45 #define MAX_PEND_REQS_PER_FUNC 4
  46 #define MAD_TIMEOUT_MS  2000
  47
  48 #define mcg_warn(fmt, arg...)   pr_warn("MCG WARNING: " fmt, ##arg)
  49 #define mcg_error(fmt, arg...)  pr_err(fmt, ##arg)
  50 #define mcg_warn_group(group, format, arg...) \
  51         pr_warn("%s-%d: %16s (port %d): WARNING: " format, __func__, __LINE__,\
  52         (group)->name, group->demux->port, ## arg)
  53
  54 #define mcg_error_group(group, format, arg...) \
  55         pr_err("  %16s: " format, (group)->name, ## arg)
  56
  57
  58 static union ib_gid mgid0;
  59
  60 static struct workqueue_struct *clean_wq;
  61
  62 enum mcast_state {
  63         MCAST_NOT_MEMBER = 0,
  64         MCAST_MEMBER,
  65 };
  66
  67 enum mcast_group_state {
  68         MCAST_IDLE,
  69         MCAST_JOIN_SENT,
  70         MCAST_LEAVE_SENT,
  71         MCAST_RESP_READY
  72 };
  73
  74 struct mcast_member {
  75         enum mcast_state state;
  76         uint8_t                 join_state;
  77         int                     num_pend_reqs;
  78         struct list_head        pending;
  79 };
  80
  81 struct ib_sa_mcmember_data {
  82         union ib_gid    mgid;
  83         union ib_gid    port_gid;
  84         __be32          qkey;
  85         __be16          mlid;
  86         u8              mtusel_mtu;
  87         u8              tclass;
  88         __be16          pkey;
  89         u8              ratesel_rate;
  90         u8              lifetmsel_lifetm;
  91         __be32          sl_flowlabel_hoplimit;
  92         u8              scope_join_state;
  93         u8              proxy_join;
  94         u8              reserved[2];
  95 };
  96
  97 struct mcast_group {
  98         struct ib_sa_mcmember_data rec;
  99         struct rb_node          node;
 100         struct list_head        mgid0_list;
 101         struct mlx4_ib_demux_ctx *demux;
 102         struct mcast_member     func[MAX_VFS];
 103         struct mutex            lock;
 104         struct work_struct      work;
 105         struct list_head        pending_list;
 106         int                     members[3];
 107         enum mcast_group_state  state;
 108         enum mcast_group_state  prev_state;
 109         struct ib_sa_mad        response_sa_mad;
 110         __be64                  last_req_tid;
 111
 112         char                    name[33]; /* MGID string */
 113         struct device_attribute dentry;
 114
 115         /* refcount is the reference count for the following:
 116            1. Each queued request
 117            2. Each invocation of the worker thread
 118            3. Membership of the port at the SA
 119         */
 120         atomic_t                refcount;
 121
 122         /* delayed work to clean pending SM request */
 123         struct delayed_work     timeout_work;
 124         struct list_head        cleanup_list;
 125 };
 126
 127 struct mcast_req {
 128         int                     func;
 129         struct ib_sa_mad        sa_mad;
 130         struct list_head        group_list;
 131         struct list_head        func_list;
 132         struct mcast_group      *group;
 133         int                     clean;
 134 };
 135
 136
 137 #define safe_atomic_dec(ref) \
 138         do {\
 139                 if (atomic_dec_and_test(ref)) \
 140                         mcg_warn_group(group, "did not expect to reach zero\n"); \
 141         } while (0)
 142
 143 static const char *get_state_string(enum mcast_group_state state)
 144 {
 145         switch (state) {
 146         case MCAST_IDLE:
 147                 return "MCAST_IDLE";
 148         case MCAST_JOIN_SENT:
 149                 return "MCAST_JOIN_SENT";
 150         case MCAST_LEAVE_SENT:
 151                 return "MCAST_LEAVE_SENT";
 152         case MCAST_RESP_READY:
 153                 return "MCAST_RESP_READY";
 154         }
 155         return "Invalid State";
 156 }
 157
 158 static struct mcast_group *mcast_find(struct mlx4_ib_demux_ctx *ctx,
 159                                       union ib_gid *mgid)
 160 {
 161         struct rb_node *node = ctx->mcg_table.rb_node;
 162         struct mcast_group *group;
 163         int ret;
 164
 165         while (node) {
 166                 group = rb_entry(node, struct mcast_group, node);
 167                 ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid);
 168                 if (!ret)
 169                         return group;
 170
 171                 if (ret < 0)
 172                         node = node->rb_left;
 173                 else
 174                         node = node->rb_right;
 175         }
 176         return NULL;
 177 }
 178
 179 static struct mcast_group *mcast_insert(struct mlx4_ib_demux_ctx *ctx,
 180                                         struct mcast_group *group)
 181 {
 182         struct rb_node **link = &ctx->mcg_table.rb_node;
 183         struct rb_node *parent = NULL;
 184         struct mcast_group *cur_group;
 185         int ret;
 186
 187         while (*link) {
 188                 parent = *link;
 189                 cur_group = rb_entry(parent, struct mcast_group, node);
 190
 191                 ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw,
 192                              sizeof group->rec.mgid);
 193                 if (ret < 0)
 194                         link = &(*link)->rb_left;
 195                 else if (ret > 0)
 196                         link = &(*link)->rb_right;
 197                 else
 198                         return cur_group;
 199         }
 200         rb_link_node(&group->node, parent, link);
 201         rb_insert_color(&group->node, &ctx->mcg_table);
 202         return NULL;
 203 }
 204
 205 static int send_mad_to_wire(struct mlx4_ib_demux_ctx *ctx, struct ib_mad *mad)
 206 {
 207         struct mlx4_ib_dev *dev = ctx->dev;
 208         struct ib_ah_attr       ah_attr;
 209
 210         spin_lock(&dev->sm_lock);
 211         if (!dev->sm_ah[ctx->port - 1]) {
 212                 /* port is not yet Active, sm_ah not ready */
 213                 spin_unlock(&dev->sm_lock);
 214                 return -EAGAIN;
 215         }
 216         mlx4_ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr);
 217         spin_unlock(&dev->sm_lock);
 218         return mlx4_ib_send_to_wire(dev, mlx4_master_func_num(dev->dev), ctx->port,
 219                                     IB_QPT_GSI, 0, 1, IB_QP1_QKEY, &ah_attr, mad);
 220 }
 221
 222 static int send_mad_to_slave(int slave, struct mlx4_ib_demux_ctx *ctx,
 223                              struct ib_mad *mad)
 224 {
 225         struct mlx4_ib_dev *dev = ctx->dev;
 226         struct ib_mad_agent *agent = dev->send_agent[ctx->port - 1][1];
 227         struct ib_wc wc;
 228         struct ib_ah_attr ah_attr;
 229
 230         /* Our agent might not yet be registered when mads start to arrive */
 231         if (!agent)
 232                 return -EAGAIN;
 233
 234         ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr);
 235
 236         wc.pkey_index = 0;
 237         wc.sl = 0;
 238         wc.dlid_path_bits = 0;
 239         wc.port_num = ctx->port;
 240         wc.slid = ah_attr.dlid;  /* opensm lid */
 241         wc.src_qp = 1;
 242         return mlx4_ib_send_to_slave(dev, slave, ctx->port, IB_QPT_GSI, &wc, NULL, mad);
 243 }
 244
 245 static int send_join_to_wire(struct mcast_group *group, struct ib_sa_mad *sa_mad)
 246 {
 247         struct ib_sa_mad mad;
 248         struct ib_sa_mcmember_data *sa_mad_data = (struct ib_sa_mcmember_data *)&mad.data;
 249         int ret;
 250
 251         /* we rely on a mad request as arrived from a VF */
 252         memcpy(&mad, sa_mad, sizeof mad);
 253
 254         /* fix port GID to be the real one (slave 0) */
 255         sa_mad_data->port_gid.global.interface_id = group->demux->guid_cache[0];
 256
 257         /* assign our own TID */
 258         mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux);
 259         group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */
 260
 261         ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad);
 262         /* set timeout handler */
 263         if (!ret) {
 264                 /* calls mlx4_ib_mcg_timeout_handler */
 265                 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work,
 266                                 msecs_to_jiffies(MAD_TIMEOUT_MS));
 267         }
 268
 269         return ret;
 270 }
 271
 272 static int send_leave_to_wire(struct mcast_group *group, u8 join_state)
 273 {
 274         struct ib_sa_mad mad;
 275         struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data;
 276         int ret;
 277
 278         memset(&mad, 0, sizeof mad);
 279         mad.mad_hdr.base_version = 1;
 280         mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
 281         mad.mad_hdr.class_version = 2;
 282         mad.mad_hdr.method = IB_SA_METHOD_DELETE;
 283         mad.mad_hdr.status = cpu_to_be16(0);
 284         mad.mad_hdr.class_specific = cpu_to_be16(0);
 285         mad.mad_hdr.tid = mlx4_ib_get_new_demux_tid(group->demux);
 286         group->last_req_tid = mad.mad_hdr.tid; /* keep it for later validation */
 287         mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
 288         mad.mad_hdr.attr_mod = cpu_to_be32(0);
 289         mad.sa_hdr.sm_key = 0x0;
 290         mad.sa_hdr.attr_offset = cpu_to_be16(7);
 291         mad.sa_hdr.comp_mask = IB_SA_MCMEMBER_REC_MGID |
 292                 IB_SA_MCMEMBER_REC_PORT_GID | IB_SA_MCMEMBER_REC_JOIN_STATE;
 293
 294         *sa_data = group->rec;
 295         sa_data->scope_join_state = join_state;
 296
 297         ret = send_mad_to_wire(group->demux, (struct ib_mad *)&mad);
 298         if (ret)
 299                 group->state = MCAST_IDLE;
 300
 301         /* set timeout handler */
 302         if (!ret) {
 303                 /* calls mlx4_ib_mcg_timeout_handler */
 304                 queue_delayed_work(group->demux->mcg_wq, &group->timeout_work,
 305                                 msecs_to_jiffies(MAD_TIMEOUT_MS));
 306         }
 307
 308         return ret;
 309 }
 310
 311 static int send_reply_to_slave(int slave, struct mcast_group *group,
 312                 struct ib_sa_mad *req_sa_mad, u16 status)
 313 {
 314         struct ib_sa_mad mad;
 315         struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)&mad.data;
 316         struct ib_sa_mcmember_data *req_sa_data = (struct ib_sa_mcmember_data *)&req_sa_mad->data;
 317         int ret;
 318
 319         memset(&mad, 0, sizeof mad);
 320         mad.mad_hdr.base_version = 1;
 321         mad.mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
 322         mad.mad_hdr.class_version = 2;
 323         mad.mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
 324         mad.mad_hdr.status = cpu_to_be16(status);
 325         mad.mad_hdr.class_specific = cpu_to_be16(0);
 326         mad.mad_hdr.tid = req_sa_mad->mad_hdr.tid;
 327         *(u8 *)&mad.mad_hdr.tid = 0; /* resetting tid to 0 */
 328         mad.mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
 329         mad.mad_hdr.attr_mod = cpu_to_be32(0);
 330         mad.sa_hdr.sm_key = req_sa_mad->sa_hdr.sm_key;
 331         mad.sa_hdr.attr_offset = cpu_to_be16(7);
 332         mad.sa_hdr.comp_mask = 0; /* ignored on responses, see IBTA spec */
 333
 334         *sa_data = group->rec;
 335
 336         /* reconstruct VF's requested join_state and port_gid */
 337         sa_data->scope_join_state &= 0xf0;
 338         sa_data->scope_join_state |= (group->func[slave].join_state & 0x0f);
 339         memcpy(&sa_data->port_gid, &req_sa_data->port_gid, sizeof req_sa_data->port_gid);
 340
 341         ret = send_mad_to_slave(slave, group->demux, (struct ib_mad *)&mad);
 342         return ret;
 343 }
 344
 345 static int check_selector(ib_sa_comp_mask comp_mask,
 346                           ib_sa_comp_mask selector_mask,
 347                           ib_sa_comp_mask value_mask,
 348                           u8 src_value, u8 dst_value)
 349 {
 350         int err;
 351         u8 selector = dst_value >> 6;
 352         dst_value &= 0x3f;
 353         src_value &= 0x3f;
 354
 355         if (!(comp_mask & selector_mask) || !(comp_mask & value_mask))
 356                 return 0;
 357
 358         switch (selector) {
 359         case IB_SA_GT:
 360                 err = (src_value <= dst_value);
 361                 break;
 362         case IB_SA_LT:
 363                 err = (src_value >= dst_value);
 364                 break;
 365         case IB_SA_EQ:
 366                 err = (src_value != dst_value);
 367                 break;
 368         default:
 369                 err = 0;
 370                 break;
 371         }
 372
 373         return err;
 374 }
 375
 376 static u16 cmp_rec(struct ib_sa_mcmember_data *src,
 377                    struct ib_sa_mcmember_data *dst, ib_sa_comp_mask comp_mask)
 378 {
 379         /* src is group record, dst is request record */
 380         /* MGID must already match */
 381         /* Port_GID we always replace to our Port_GID, so it is a match */
 382
 383 #define MAD_STATUS_REQ_INVALID 0x0200
 384         if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey)
 385                 return MAD_STATUS_REQ_INVALID;
 386         if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid)
 387                 return MAD_STATUS_REQ_INVALID;
 388         if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR,
 389                                  IB_SA_MCMEMBER_REC_MTU,
 390                                  src->mtusel_mtu, dst->mtusel_mtu))
 391                 return MAD_STATUS_REQ_INVALID;
 392         if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS &&
 393             src->tclass != dst->tclass)
 394                 return MAD_STATUS_REQ_INVALID;
 395         if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey)
 396                 return MAD_STATUS_REQ_INVALID;
 397         if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR,
 398                                  IB_SA_MCMEMBER_REC_RATE,
 399                                  src->ratesel_rate, dst->ratesel_rate))
 400                 return MAD_STATUS_REQ_INVALID;
 401         if (check_selector(comp_mask,
 402                                  IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR,
 403                                  IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME,
 404                                  src->lifetmsel_lifetm, dst->lifetmsel_lifetm))
 405                 return MAD_STATUS_REQ_INVALID;
 406         if (comp_mask & IB_SA_MCMEMBER_REC_SL &&
 407                         (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0xf0000000) !=
 408                         (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0xf0000000))
 409                 return MAD_STATUS_REQ_INVALID;
 410         if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL &&
 411                         (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x0fffff00) !=
 412                         (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x0fffff00))
 413                 return MAD_STATUS_REQ_INVALID;
 414         if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT &&
 415                         (be32_to_cpu(src->sl_flowlabel_hoplimit) & 0x000000ff) !=
 416                         (be32_to_cpu(dst->sl_flowlabel_hoplimit) & 0x000000ff))
 417                 return MAD_STATUS_REQ_INVALID;
 418         if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE &&
 419                         (src->scope_join_state & 0xf0) !=
 420                         (dst->scope_join_state & 0xf0))
 421                 return MAD_STATUS_REQ_INVALID;
 422
 423         /* join_state checked separately, proxy_join ignored */
 424
 425         return 0;
 426 }
 427
 428 /* release group, return 1 if this was last release and group is destroyed
 429  * timout work is canceled sync */
 430 static int release_group(struct mcast_group *group, int from_timeout_handler)
 431 {
 432         struct mlx4_ib_demux_ctx *ctx = group->demux;
 433         int nzgroup;
 434
 435         mutex_lock(&ctx->mcg_table_lock);
 436         mutex_lock(&group->lock);
 437         if (atomic_dec_and_test(&group->refcount)) {
 438                 if (!from_timeout_handler) {
 439                         if (group->state != MCAST_IDLE &&
 440                             !cancel_delayed_work(&group->timeout_work)) {
 441                                 atomic_inc(&group->refcount);
 442                                 mutex_unlock(&group->lock);
 443                                 mutex_unlock(&ctx->mcg_table_lock);
 444                                 return 0;
 445                         }
 446                 }
 447
 448                 nzgroup = memcmp(&group->rec.mgid, &mgid0, sizeof mgid0);
 449                 if (nzgroup)
 450                         del_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
 451                 if (!list_empty(&group->pending_list))
 452                         mcg_warn_group(group, "releasing a group with non empty pending list\n");
 453                 if (nzgroup)
 454                         rb_erase(&group->node, &ctx->mcg_table);
 455                 list_del_init(&group->mgid0_list);
 456                 mutex_unlock(&group->lock);
 457                 mutex_unlock(&ctx->mcg_table_lock);
 458                 kfree(group);
 459                 return 1;
 460         } else {
 461                 mutex_unlock(&group->lock);
 462                 mutex_unlock(&ctx->mcg_table_lock);
 463         }
 464         return 0;
 465 }
 466
 467 static void adjust_membership(struct mcast_group *group, u8 join_state, int inc)
 468 {
 469         int i;
 470
 471         for (i = 0; i < 3; i++, join_state >>= 1)
 472                 if (join_state & 0x1)
 473                         group->members[i] += inc;
 474 }
 475
 476 static u8 get_leave_state(struct mcast_group *group)
 477 {
 478         u8 leave_state = 0;
 479         int i;
 480
 481         for (i = 0; i < 3; i++)
 482                 if (!group->members[i])
 483                         leave_state |= (1 << i);
 484
 485         return leave_state & (group->rec.scope_join_state & 7);
 486 }
 487
 488 static int join_group(struct mcast_group *group, int slave, u8 join_mask)
 489 {
 490         int ret = 0;
 491         u8 join_state;
 492
 493         /* remove bits that slave is already member of, and adjust */
 494         join_state = join_mask & (~group->func[slave].join_state);
 495         adjust_membership(group, join_state, 1);
 496         group->func[slave].join_state |= join_state;
 497         if (group->func[slave].state != MCAST_MEMBER && join_state) {
 498                 group->func[slave].state = MCAST_MEMBER;
 499                 ret = 1;
 500         }
 501         return ret;
 502 }
 503
 504 static int leave_group(struct mcast_group *group, int slave, u8 leave_state)
 505 {
 506         int ret = 0;
 507
 508         adjust_membership(group, leave_state, -1);
 509         group->func[slave].join_state &= ~leave_state;
 510         if (!group->func[slave].join_state) {
 511                 group->func[slave].state = MCAST_NOT_MEMBER;
 512                 ret = 1;
 513         }
 514         return ret;
 515 }
 516
 517 static int check_leave(struct mcast_group *group, int slave, u8 leave_mask)
 518 {
 519         if (group->func[slave].state != MCAST_MEMBER)
 520                 return MAD_STATUS_REQ_INVALID;
 521
 522         /* make sure we're not deleting unset bits */
 523         if (~group->func[slave].join_state & leave_mask)
 524                 return MAD_STATUS_REQ_INVALID;
 525
 526         if (!leave_mask)
 527                 return MAD_STATUS_REQ_INVALID;
 528
 529         return 0;
 530 }
 531
 532 static void mlx4_ib_mcg_timeout_handler(struct work_struct *work)
 533 {
 534         struct delayed_work *delay = to_delayed_work(work);
 535         struct mcast_group *group;
 536         struct mcast_req *req = NULL;
 537
 538         group = container_of(delay, typeof(*group), timeout_work);
 539
 540         mutex_lock(&group->lock);
 541         if (group->state == MCAST_JOIN_SENT) {
 542                 if (!list_empty(&group->pending_list)) {
 543                         req = list_first_entry(&group->pending_list, struct mcast_req, group_list);
 544                         list_del(&req->group_list);
 545                         list_del(&req->func_list);
 546                         --group->func[req->func].num_pend_reqs;
 547                         mutex_unlock(&group->lock);
 548                         kfree(req);
 549                         if (memcmp(&group->rec.mgid, &mgid0, sizeof mgid0)) {
 550                                 if (release_group(group, 1))
 551                                         return;
 552                         } else {
 553                                 kfree(group);
 554                                 return;
 555                         }
 556                         mutex_lock(&group->lock);
 557                 } else
 558                         mcg_warn_group(group, "DRIVER BUG\n");
 559         } else if (group->state == MCAST_LEAVE_SENT) {
 560                 if (group->rec.scope_join_state & 7)
 561                         group->rec.scope_join_state &= 0xf8;
 562                 group->state = MCAST_IDLE;
 563                 mutex_unlock(&group->lock);
 564                 if (release_group(group, 1))
 565                         return;
 566                 mutex_lock(&group->lock);
 567         } else
 568                 mcg_warn_group(group, "invalid state %s\n", get_state_string(group->state));
 569         group->state = MCAST_IDLE;
 570         atomic_inc(&group->refcount);
 571         if (!queue_work(group->demux->mcg_wq, &group->work))
 572                 safe_atomic_dec(&group->refcount);
 573
 574         mutex_unlock(&group->lock);
 575 }
 576
 577 static int handle_leave_req(struct mcast_group *group, u8 leave_mask,
 578                             struct mcast_req *req)
 579 {
 580         u16 status;
 581
 582         if (req->clean)
 583                 leave_mask = group->func[req->func].join_state;
 584
 585         status = check_leave(group, req->func, leave_mask);
 586         if (!status)
 587                 leave_group(group, req->func, leave_mask);
 588
 589         if (!req->clean)
 590                 send_reply_to_slave(req->func, group, &req->sa_mad, status);
 591         --group->func[req->func].num_pend_reqs;
 592         list_del(&req->group_list);
 593         list_del(&req->func_list);
 594         kfree(req);
 595         return 1;
 596 }
 597
 598 static int handle_join_req(struct mcast_group *group, u8 join_mask,
 599                            struct mcast_req *req)
 600 {
 601         u8 group_join_state = group->rec.scope_join_state & 7;
 602         int ref = 0;
 603         u16 status;
 604         struct ib_sa_mcmember_data *sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data;
 605
 606         if (join_mask == (group_join_state & join_mask)) {
 607                 /* port's membership need not change */
 608                 status = cmp_rec(&group->rec, sa_data, req->sa_mad.sa_hdr.comp_mask);
 609                 if (!status)
 610                         join_group(group, req->func, join_mask);
 611
 612                 --group->func[req->func].num_pend_reqs;
 613                 send_reply_to_slave(req->func, group, &req->sa_mad, status);
 614                 list_del(&req->group_list);
 615                 list_del(&req->func_list);
 616                 kfree(req);
 617                 ++ref;
 618         } else {
 619                 /* port's membership needs to be updated */
 620                 group->prev_state = group->state;
 621                 if (send_join_to_wire(group, &req->sa_mad)) {
 622                         --group->func[req->func].num_pend_reqs;
 623                         list_del(&req->group_list);
 624                         list_del(&req->func_list);
 625                         kfree(req);
 626                         ref = 1;
 627                         group->state = group->prev_state;
 628                 } else
 629                         group->state = MCAST_JOIN_SENT;
 630         }
 631
 632         return ref;
 633 }
 634
 635 static void mlx4_ib_mcg_work_handler(struct work_struct *work)
 636 {
 637         struct mcast_group *group;
 638         struct mcast_req *req = NULL;
 639         struct ib_sa_mcmember_data *sa_data;
 640         u8 req_join_state;
 641         int rc = 1; /* release_count - this is for the scheduled work */
 642         u16 status;
 643         u8 method;
 644
 645         group = container_of(work, typeof(*group), work);
 646
 647         mutex_lock(&group->lock);
 648
 649         /* First, let's see if a response from SM is waiting regarding this group.
 650          * If so, we need to update the group's REC. If this is a bad response, we
 651          * may need to send a bad response to a VF waiting for it. If VF is waiting
 652          * and this is a good response, the VF will be answered later in this func. */
 653         if (group->state == MCAST_RESP_READY) {
 654                 /* cancels mlx4_ib_mcg_timeout_handler */
 655                 cancel_delayed_work(&group->timeout_work);
 656                 status = be16_to_cpu(group->response_sa_mad.mad_hdr.status);
 657                 method = group->response_sa_mad.mad_hdr.method;
 658                 if (group->last_req_tid != group->response_sa_mad.mad_hdr.tid) {
 659                         mcg_warn_group(group, "Got MAD response to existing MGID but wrong TID, dropping. Resp TID=%llx, group TID=%llx\n",
 660                                 be64_to_cpu(group->response_sa_mad.mad_hdr.tid),
 661                                 be64_to_cpu(group->last_req_tid));
 662                         group->state = group->prev_state;
 663                         goto process_requests;
 664                 }
 665                 if (status) {
 666                         if (!list_empty(&group->pending_list))
 667                                 req = list_first_entry(&group->pending_list,
 668                                                 struct mcast_req, group_list);
 669                         if ((method == IB_MGMT_METHOD_GET_RESP)) {
 670                                         if (req) {
 671                                                 send_reply_to_slave(req->func, group, &req->sa_mad, status);
 672                                                 --group->func[req->func].num_pend_reqs;
 673                                                 list_del(&req->group_list);
 674                                                 list_del(&req->func_list);
 675                                                 kfree(req);
 676                                                 ++rc;
 677                                         } else
 678                                                 mcg_warn_group(group, "no request for failed join\n");
 679                         } else if (method == IB_SA_METHOD_DELETE_RESP && group->demux->flushing)
 680                                 ++rc;
 681                 } else {
 682                         u8 resp_join_state;
 683                         u8 cur_join_state;
 684
 685                         resp_join_state = ((struct ib_sa_mcmember_data *)
 686                                                 group->response_sa_mad.data)->scope_join_state & 7;
 687                         cur_join_state = group->rec.scope_join_state & 7;
 688
 689                         if (method == IB_MGMT_METHOD_GET_RESP) {
 690                                 /* successfull join */
 691                                 if (!cur_join_state && resp_join_state)
 692                                         --rc;
 693                         } else if (!resp_join_state)
 694                                         ++rc;
 695                         memcpy(&group->rec, group->response_sa_mad.data, sizeof group->rec);
 696                 }
 697                 group->state = MCAST_IDLE;
 698         }
 699
 700 process_requests:
 701         /* We should now go over pending join/leave requests, as long as we are idle. */
 702         while (!list_empty(&group->pending_list) && group->state == MCAST_IDLE) {
 703                 req = list_first_entry(&group->pending_list, struct mcast_req,
 704                                        group_list);
 705                 sa_data = (struct ib_sa_mcmember_data *)req->sa_mad.data;
 706                 req_join_state = sa_data->scope_join_state & 0x7;
 707
 708                 /* For a leave request, we will immediately answer the VF, and
 709                  * update our internal counters. The actual leave will be sent
 710                  * to SM later, if at all needed. We dequeue the request now. */
 711                 if (req->sa_mad.mad_hdr.method == IB_SA_METHOD_DELETE)
 712                         rc += handle_leave_req(group, req_join_state, req);
 713                 else
 714                         rc += handle_join_req(group, req_join_state, req);
 715         }
 716
 717         /* Handle leaves */
 718         if (group->state == MCAST_IDLE) {
 719                 req_join_state = get_leave_state(group);
 720                 if (req_join_state) {
 721                         group->rec.scope_join_state &= ~req_join_state;
 722                         group->prev_state = group->state;
 723                         if (send_leave_to_wire(group, req_join_state)) {
 724                                 group->state = group->prev_state;
 725                                 ++rc;
 726                         } else
 727                                 group->state = MCAST_LEAVE_SENT;
 728                 }
 729         }
 730
 731         if (!list_empty(&group->pending_list) && group->state == MCAST_IDLE)
 732                 goto process_requests;
 733         mutex_unlock(&group->lock);
 734
 735         while (rc--)
 736                 release_group(group, 0);
 737 }
 738
 739 static struct mcast_group *search_relocate_mgid0_group(struct mlx4_ib_demux_ctx *ctx,
 740                                                        __be64 tid,
 741                                                        union ib_gid *new_mgid)
 742 {
 743         struct mcast_group *group = NULL, *cur_group;
 744         struct mcast_req *req;
 745         struct list_head *pos;
 746         struct list_head *n;
 747
 748         mutex_lock(&ctx->mcg_table_lock);
 749         list_for_each_safe(pos, n, &ctx->mcg_mgid0_list) {
 750                 group = list_entry(pos, struct mcast_group, mgid0_list);
 751                 mutex_lock(&group->lock);
 752                 if (group->last_req_tid == tid) {
 753                         if (memcmp(new_mgid, &mgid0, sizeof mgid0)) {
 754                                 group->rec.mgid = *new_mgid;
 755                                 sprintf(group->name, "%016llx%016llx",
 756                                                 be64_to_cpu(group->rec.mgid.global.subnet_prefix),
 757                                                 be64_to_cpu(group->rec.mgid.global.interface_id));
 758                                 list_del_init(&group->mgid0_list);
 759                                 cur_group = mcast_insert(ctx, group);
 760                                 if (cur_group) {
 761                                         /* A race between our code and SM. Silently cleaning the new one */
 762                                         req = list_first_entry(&group->pending_list,
 763                                                                struct mcast_req, group_list);
 764                                         --group->func[req->func].num_pend_reqs;
 765                                         list_del(&req->group_list);
 766                                         list_del(&req->func_list);
 767                                         kfree(req);
 768                                         mutex_unlock(&group->lock);
 769                                         mutex_unlock(&ctx->mcg_table_lock);
 770                                         release_group(group, 0);
 771                                         return NULL;
 772                                 }
 773
 774                                 atomic_inc(&group->refcount);
 775                                 add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
 776                                 mutex_unlock(&group->lock);
 777                                 mutex_unlock(&ctx->mcg_table_lock);
 778                                 return group;
 779                         } else {
 780                                 struct mcast_req *tmp1, *tmp2;
 781
 782                                 list_del(&group->mgid0_list);
 783                                 if (!list_empty(&group->pending_list) && group->state != MCAST_IDLE)
 784                                         cancel_delayed_work_sync(&group->timeout_work);
 785
 786                                 list_for_each_entry_safe(tmp1, tmp2, &group->pending_list, group_list) {
 787                                         list_del(&tmp1->group_list);
 788                                         kfree(tmp1);
 789                                 }
 790                                 mutex_unlock(&group->lock);
 791                                 mutex_unlock(&ctx->mcg_table_lock);
 792                                 kfree(group);
 793                                 return NULL;
 794                         }
 795                 }
 796                 mutex_unlock(&group->lock);
 797         }
 798         mutex_unlock(&ctx->mcg_table_lock);
 799
 800         return NULL;
 801 }
 802
 803 static ssize_t sysfs_show_group(struct device *dev,
 804                 struct device_attribute *attr, char *buf);
 805
 806 static struct mcast_group *acquire_group(struct mlx4_ib_demux_ctx *ctx,
 807                                          union ib_gid *mgid, int create,
 808                                          gfp_t gfp_mask)
 809 {
 810         struct mcast_group *group, *cur_group;
 811         int is_mgid0;
 812         int i;
 813
 814         is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
 815         if (!is_mgid0) {
 816                 group = mcast_find(ctx, mgid);
 817                 if (group)
 818                         goto found;
 819         }
 820
 821         if (!create)
 822                 return ERR_PTR(-ENOENT);
 823
 824         group = kzalloc(sizeof *group, gfp_mask);
 825         if (!group)
 826                 return ERR_PTR(-ENOMEM);
 827
 828         group->demux = ctx;
 829         group->rec.mgid = *mgid;
 830         INIT_LIST_HEAD(&group->pending_list);
 831         INIT_LIST_HEAD(&group->mgid0_list);
 832         for (i = 0; i < MAX_VFS; ++i)
 833                 INIT_LIST_HEAD(&group->func[i].pending);
 834         INIT_WORK(&group->work, mlx4_ib_mcg_work_handler);
 835         INIT_DELAYED_WORK(&group->timeout_work, mlx4_ib_mcg_timeout_handler);
 836         mutex_init(&group->lock);
 837         sprintf(group->name, "%016llx%016llx",
 838                         be64_to_cpu(group->rec.mgid.global.subnet_prefix),
 839                         be64_to_cpu(group->rec.mgid.global.interface_id));
 840         sysfs_attr_init(&group->dentry.attr);
 841         group->dentry.show = sysfs_show_group;
 842         group->dentry.store = NULL;
 843         group->dentry.attr.name = group->name;
 844         group->dentry.attr.mode = 0400;
 845         group->state = MCAST_IDLE;
 846
 847         if (is_mgid0) {
 848                 list_add(&group->mgid0_list, &ctx->mcg_mgid0_list);
 849                 goto found;
 850         }
 851
 852         cur_group = mcast_insert(ctx, group);
 853         if (cur_group) {
 854                 mcg_warn("group just showed up %s - confused\n", cur_group->name);
 855                 kfree(group);
 856                 return ERR_PTR(-EINVAL);
 857         }
 858
 859         add_sysfs_port_mcg_attr(ctx->dev, ctx->port, &group->dentry.attr);
 860
 861 found:
 862         atomic_inc(&group->refcount);
 863         return group;
 864 }
 865
 866 static void queue_req(struct mcast_req *req)
 867 {
 868         struct mcast_group *group = req->group;
 869
 870         atomic_inc(&group->refcount); /* for the request */
 871         atomic_inc(&group->refcount); /* for scheduling the work */
 872         list_add_tail(&req->group_list, &group->pending_list);
 873         list_add_tail(&req->func_list, &group->func[req->func].pending);
 874         /* calls mlx4_ib_mcg_work_handler */
 875         if (!queue_work(group->demux->mcg_wq, &group->work))
 876                 safe_atomic_dec(&group->refcount);
 877 }
 878
 879 int mlx4_ib_mcg_demux_handler(struct ib_device *ibdev, int port, int slave,
 880                               struct ib_sa_mad *mad)
 881 {
 882         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 883         struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)mad->data;
 884         struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1];
 885         struct mcast_group *group;
 886
 887         switch (mad->mad_hdr.method) {
 888         case IB_MGMT_METHOD_GET_RESP:
 889         case IB_SA_METHOD_DELETE_RESP:
 890                 mutex_lock(&ctx->mcg_table_lock);
 891                 group = acquire_group(ctx, &rec->mgid, 0, GFP_KERNEL);
 892                 mutex_unlock(&ctx->mcg_table_lock);
 893                 if (IS_ERR(group)) {
 894                         if (mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP) {
 895                                 __be64 tid = mad->mad_hdr.tid;
 896                                 *(u8 *)(&tid) = (u8)slave; /* in group we kept the modified TID */
 897                                 group = search_relocate_mgid0_group(ctx, tid, &rec->mgid);
 898                         } else
 899                                 group = NULL;
 900                 }
 901
 902                 if (!group)
 903                         return 1;
 904
 905                 mutex_lock(&group->lock);
 906                 group->response_sa_mad = *mad;
 907                 group->prev_state = group->state;
 908                 group->state = MCAST_RESP_READY;
 909                 /* calls mlx4_ib_mcg_work_handler */
 910                 atomic_inc(&group->refcount);
 911                 if (!queue_work(ctx->mcg_wq, &group->work))
 912                         safe_atomic_dec(&group->refcount);
 913                 mutex_unlock(&group->lock);
 914                 release_group(group, 0);
 915                 return 1; /* consumed */
 916         case IB_MGMT_METHOD_SET:
 917         case IB_SA_METHOD_GET_TABLE:
 918         case IB_SA_METHOD_GET_TABLE_RESP:
 919         case IB_SA_METHOD_DELETE:
 920                 return 0; /* not consumed, pass-through to guest over tunnel */
 921         default:
 922                 mcg_warn("In demux, port %d: unexpected MCMember method: 0x%x, dropping\n",
 923                         port, mad->mad_hdr.method);
 924                 return 1; /* consumed */
 925         }
 926 }
 927
 928 int mlx4_ib_mcg_multiplex_handler(struct ib_device *ibdev, int port,
 929                                   int slave, struct ib_sa_mad *sa_mad)
 930 {
 931         struct mlx4_ib_dev *dev = to_mdev(ibdev);
 932         struct ib_sa_mcmember_data *rec = (struct ib_sa_mcmember_data *)sa_mad->data;
 933         struct mlx4_ib_demux_ctx *ctx = &dev->sriov.demux[port - 1];
 934         struct mcast_group *group;
 935         struct mcast_req *req;
 936         int may_create = 0;
 937
 938         if (ctx->flushing)
 939                 return -EAGAIN;
 940
 941         switch (sa_mad->mad_hdr.method) {
 942         case IB_MGMT_METHOD_SET:
 943                 may_create = 1;
 944         case IB_SA_METHOD_DELETE:
 945                 req = kzalloc(sizeof *req, GFP_KERNEL);
 946                 if (!req)
 947                         return -ENOMEM;
 948
 949                 req->func = slave;
 950                 req->sa_mad = *sa_mad;
 951
 952                 mutex_lock(&ctx->mcg_table_lock);
 953                 group = acquire_group(ctx, &rec->mgid, may_create, GFP_KERNEL);
 954                 mutex_unlock(&ctx->mcg_table_lock);
 955                 if (IS_ERR(group)) {
 956                         kfree(req);
 957                         return PTR_ERR(group);
 958                 }
 959                 mutex_lock(&group->lock);
 960                 if (group->func[slave].num_pend_reqs > MAX_PEND_REQS_PER_FUNC) {
 961                         mutex_unlock(&group->lock);
 962                         mcg_warn_group(group, "Port %d, Func %d has too many pending requests (%d), dropping\n",
 963                                        port, slave, MAX_PEND_REQS_PER_FUNC);
 964                         release_group(group, 0);
 965                         kfree(req);
 966                         return -ENOMEM;
 967                 }
 968                 ++group->func[slave].num_pend_reqs;
 969                 req->group = group;
 970                 queue_req(req);
 971                 mutex_unlock(&group->lock);
 972                 release_group(group, 0);
 973                 return 1; /* consumed */
 974         case IB_SA_METHOD_GET_TABLE:
 975         case IB_MGMT_METHOD_GET_RESP:
 976         case IB_SA_METHOD_GET_TABLE_RESP:
 977         case IB_SA_METHOD_DELETE_RESP:
 978                 return 0; /* not consumed, pass-through */
 979         default:
 980                 mcg_warn("In multiplex, port %d, func %d: unexpected MCMember method: 0x%x, dropping\n",
 981                         port, slave, sa_mad->mad_hdr.method);
 982                 return 1; /* consumed */
 983         }
 984 }
 985
 986 static ssize_t sysfs_show_group(struct device *dev,
 987                 struct device_attribute *attr, char *buf)
 988 {
 989         struct mcast_group *group =
 990                 container_of(attr, struct mcast_group, dentry);
 991         struct mcast_req *req = NULL;
 992         char pending_str[40];
 993         char state_str[40];
 994         ssize_t len = 0;
 995         int f;
 996
 997         if (group->state == MCAST_IDLE)
 998                 sprintf(state_str, "%s", get_state_string(group->state));
 999         else
1000                 sprintf(state_str, "%s(TID=0x%llx)",
1001                                 get_state_string(group->state),
1002                                 be64_to_cpu(group->last_req_tid));
1003         if (list_empty(&group->pending_list)) {
1004                 sprintf(pending_str, "No");
1005         } else {
1006                 req = list_first_entry(&group->pending_list, struct mcast_req, group_list);
1007                 sprintf(pending_str, "Yes(TID=0x%llx)",
1008                                 be64_to_cpu(req->sa_mad.mad_hdr.tid));
1009         }
1010         len += sprintf(buf + len, "%1d [%02d,%02d,%02d] %4d %4s %5s     ",
1011                         group->rec.scope_join_state & 0xf,
1012                         group->members[2], group->members[1], group->members[0],
1013                         atomic_read(&group->refcount),
1014                         pending_str,
1015                         state_str);
1016         for (f = 0; f < MAX_VFS; ++f)
1017                 if (group->func[f].state == MCAST_MEMBER)
1018                         len += sprintf(buf + len, "%d[%1x] ",
1019                                         f, group->func[f].join_state);
1020
1021         len += sprintf(buf + len, "\t\t(%4hx %4x %2x %2x %2x %2x %2x "
1022                 "%4x %4x %2x %2x)\n",
1023                 be16_to_cpu(group->rec.pkey),
1024                 be32_to_cpu(group->rec.qkey),
1025                 (group->rec.mtusel_mtu & 0xc0) >> 6,
1026                 group->rec.mtusel_mtu & 0x3f,
1027                 group->rec.tclass,
1028                 (group->rec.ratesel_rate & 0xc0) >> 6,
1029                 group->rec.ratesel_rate & 0x3f,
1030                 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0xf0000000) >> 28,
1031                 (be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x0fffff00) >> 8,
1032                 be32_to_cpu(group->rec.sl_flowlabel_hoplimit) & 0x000000ff,
1033                 group->rec.proxy_join);
1034
1035         return len;
1036 }
1037
1038 int mlx4_ib_mcg_port_init(struct mlx4_ib_demux_ctx *ctx)
1039 {
1040         char name[20];
1041
1042         atomic_set(&ctx->tid, 0);
1043         sprintf(name, "mlx4_ib_mcg%d", ctx->port);
1044         ctx->mcg_wq = create_singlethread_workqueue(name);
1045         if (!ctx->mcg_wq)
1046                 return -ENOMEM;
1047
1048         mutex_init(&ctx->mcg_table_lock);
1049         ctx->mcg_table = RB_ROOT;
1050         INIT_LIST_HEAD(&ctx->mcg_mgid0_list);
1051         ctx->flushing = 0;
1052
1053         return 0;
1054 }
1055
1056 static void force_clean_group(struct mcast_group *group)
1057 {
1058         struct mcast_req *req, *tmp
1059                 ;
1060         list_for_each_entry_safe(req, tmp, &group->pending_list, group_list) {
1061                 list_del(&req->group_list);
1062                 kfree(req);
1063         }
1064         del_sysfs_port_mcg_attr(group->demux->dev, group->demux->port, &group->dentry.attr);
1065         rb_erase(&group->node, &group->demux->mcg_table);
1066         kfree(group);
1067 }
1068
1069 static void _mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq)
1070 {
1071         int i;
1072         struct rb_node *p;
1073         struct mcast_group *group;
1074         unsigned long end;
1075         int count;
1076
1077         if (ctx->flushing)
1078                 return;
1079
1080         ctx->flushing = 1;
1081         for (i = 0; i < MAX_VFS; ++i)
1082                 clean_vf_mcast(ctx, i);
1083
1084         end = jiffies + msecs_to_jiffies(MAD_TIMEOUT_MS + 3000);
1085         do {
1086                 count = 0;
1087                 mutex_lock(&ctx->mcg_table_lock);
1088                 for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p))
1089                         ++count;
1090                 mutex_unlock(&ctx->mcg_table_lock);
1091                 if (!count)
1092                         break;
1093
1094                 msleep(1);
1095         } while (time_after(end, jiffies));
1096
1097         flush_workqueue(ctx->mcg_wq);
1098         if (destroy_wq)
1099                 destroy_workqueue(ctx->mcg_wq);
1100
1101         mutex_lock(&ctx->mcg_table_lock);
1102         while ((p = rb_first(&ctx->mcg_table)) != NULL) {
1103                 group = rb_entry(p, struct mcast_group, node);
1104                 if (atomic_read(&group->refcount))
1105                         mcg_warn_group(group, "group refcount %d!!! (pointer %p)\n", atomic_read(&group->refcount), group);
1106
1107                 force_clean_group(group);
1108         }
1109         mutex_unlock(&ctx->mcg_table_lock);
1110
1111         if (!destroy_wq)
1112                 ctx->flushing = 0;
1113 }
1114
1115 struct clean_work {
1116         struct work_struct work;
1117         struct mlx4_ib_demux_ctx *ctx;
1118         int destroy_wq;
1119 };
1120
1121 static void mcg_clean_task(struct work_struct *work)
1122 {
1123         struct clean_work *cw = container_of(work, struct clean_work, work);
1124
1125         _mlx4_ib_mcg_port_cleanup(cw->ctx, cw->destroy_wq);
1126         kfree(cw);
1127 }
1128
1129 void mlx4_ib_mcg_port_cleanup(struct mlx4_ib_demux_ctx *ctx, int destroy_wq)
1130 {
1131         struct clean_work *work;
1132
1133         if (destroy_wq) {
1134                 _mlx4_ib_mcg_port_cleanup(ctx, destroy_wq);
1135                 return;
1136         }
1137
1138         work = kmalloc(sizeof *work, GFP_KERNEL);
1139         if (!work) {
1140                 mcg_warn("failed allocating work for cleanup\n");
1141                 return;
1142         }
1143
1144         work->ctx = ctx;
1145         work->destroy_wq = destroy_wq;
1146         INIT_WORK(&work->work, mcg_clean_task);
1147         queue_work(clean_wq, &work->work);
1148 }
1149
1150 static void build_leave_mad(struct mcast_req *req)
1151 {
1152         struct ib_sa_mad *mad = &req->sa_mad;
1153
1154         mad->mad_hdr.method = IB_SA_METHOD_DELETE;
1155 }
1156
1157
1158 static void clear_pending_reqs(struct mcast_group *group, int vf)
1159 {
1160         struct mcast_req *req, *tmp, *group_first = NULL;
1161         int clear;
1162         int pend = 0;
1163
1164         if (!list_empty(&group->pending_list))
1165                 group_first = list_first_entry(&group->pending_list, struct mcast_req, group_list);
1166
1167         list_for_each_entry_safe(req, tmp, &group->func[vf].pending, func_list) {
1168                 clear = 1;
1169                 if (group_first == req &&
1170                     (group->state == MCAST_JOIN_SENT ||
1171                      group->state == MCAST_LEAVE_SENT)) {
1172                         clear = cancel_delayed_work(&group->timeout_work);
1173                         pend = !clear;
1174                         group->state = MCAST_IDLE;
1175                 }
1176                 if (clear) {
1177                         --group->func[vf].num_pend_reqs;
1178                         list_del(&req->group_list);
1179                         list_del(&req->func_list);
1180                         kfree(req);
1181                         atomic_dec(&group->refcount);
1182                 }
1183         }
1184
1185         if (!pend && (!list_empty(&group->func[vf].pending) || group->func[vf].num_pend_reqs)) {
1186                 mcg_warn_group(group, "DRIVER BUG: list_empty %d, num_pend_reqs %d\n",
1187                                list_empty(&group->func[vf].pending), group->func[vf].num_pend_reqs);
1188         }
1189 }
1190
1191 static int push_deleteing_req(struct mcast_group *group, int slave)
1192 {
1193         struct mcast_req *req;
1194         struct mcast_req *pend_req;
1195
1196         if (!group->func[slave].join_state)
1197                 return 0;
1198
1199         req = kzalloc(sizeof *req, GFP_KERNEL);
1200         if (!req) {
1201                 mcg_warn_group(group, "failed allocation - may leave stall groups\n");
1202                 return -ENOMEM;
1203         }
1204
1205         if (!list_empty(&group->func[slave].pending)) {
1206                 pend_req = list_entry(group->func[slave].pending.prev, struct mcast_req, group_list);
1207                 if (pend_req->clean) {
1208                         kfree(req);
1209                         return 0;
1210                 }
1211         }
1212
1213         req->clean = 1;
1214         req->func = slave;
1215         req->group = group;
1216         ++group->func[slave].num_pend_reqs;
1217         build_leave_mad(req);
1218         queue_req(req);
1219         return 0;
1220 }
1221
1222 void clean_vf_mcast(struct mlx4_ib_demux_ctx *ctx, int slave)
1223 {
1224         struct mcast_group *group;
1225         struct rb_node *p;
1226
1227         mutex_lock(&ctx->mcg_table_lock);
1228         for (p = rb_first(&ctx->mcg_table); p; p = rb_next(p)) {
1229                 group = rb_entry(p, struct mcast_group, node);
1230                 mutex_lock(&group->lock);
1231                 if (atomic_read(&group->refcount)) {
1232                         /* clear pending requests of this VF */
1233                         clear_pending_reqs(group, slave);
1234                         push_deleteing_req(group, slave);
1235                 }
1236                 mutex_unlock(&group->lock);
1237         }
1238         mutex_unlock(&ctx->mcg_table_lock);
1239 }
1240
1241
1242 int mlx4_ib_mcg_init(void)
1243 {
1244         clean_wq = create_singlethread_workqueue("mlx4_ib_mcg");
1245         if (!clean_wq)
1246                 return -ENOMEM;
1247
1248         return 0;
1249 }
1250
1251 void mlx4_ib_mcg_destroy(void)
1252 {
1253         destroy_workqueue(clean_wq);
1254 }