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   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: ipoib_multicast.c 1362 2004-12-18 15:56:29Z roland $
  35  */
  36
  37 #include <linux/skbuff.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/ip.h>
  40 #include <linux/in.h>
  41 #include <linux/igmp.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/delay.h>
  44 #include <linux/completion.h>
  45
  46 #include <net/dst.h>
  47
  48 #include "ipoib.h"
  49
  50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  51 static int mcast_debug_level;
  52
  53 module_param(mcast_debug_level, int, 0644);
  54 MODULE_PARM_DESC(mcast_debug_level,
  55                  "Enable multicast debug tracing if > 0");
  56 #endif
  57
  58 static DEFINE_MUTEX(mcast_mutex);
  59
  60 /* Used for all multicast joins (broadcast, IPv4 mcast and IPv6 mcast) */
  61 struct ipoib_mcast {
  62         struct ib_sa_mcmember_rec mcmember;
  63         struct ipoib_ah          *ah;
  64
  65         struct rb_node    rb_node;
  66         struct list_head  list;
  67         struct completion done;
  68
  69         int                 query_id;
  70         struct ib_sa_query *query;
  71
  72         unsigned long created;
  73         unsigned long backoff;
  74
  75         unsigned long flags;
  76         unsigned char logcount;
  77
  78         struct list_head  neigh_list;
  79
  80         struct sk_buff_head pkt_queue;
  81
  82         struct net_device *dev;
  83 };
  84
  85 struct ipoib_mcast_iter {
  86         struct net_device *dev;
  87         union ib_gid       mgid;
  88         unsigned long      created;
  89         unsigned int       queuelen;
  90         unsigned int       complete;
  91         unsigned int       send_only;
  92 };
  93
  94 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  95 {
  96         struct net_device *dev = mcast->dev;
  97         struct ipoib_dev_priv *priv = netdev_priv(dev);
  98         struct ipoib_neigh *neigh, *tmp;
  99         unsigned long flags;
 100         int tx_dropped = 0;
 101
 102         ipoib_dbg_mcast(netdev_priv(dev),
 103                         "deleting multicast group " IPOIB_GID_FMT "\n",
 104                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 105
 106         spin_lock_irqsave(&priv->lock, flags);
 107
 108         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
 109                 /*
 110                  * It's safe to call ipoib_put_ah() inside priv->lock
 111                  * here, because we know that mcast->ah will always
 112                  * hold one more reference, so ipoib_put_ah() will
 113                  * never do more than decrement the ref count.
 114                  */
 115                 if (neigh->ah)
 116                         ipoib_put_ah(neigh->ah);
 117                 *to_ipoib_neigh(neigh->neighbour) = NULL;
 118                 neigh->neighbour->ops->destructor = NULL;
 119                 kfree(neigh);
 120         }
 121
 122         spin_unlock_irqrestore(&priv->lock, flags);
 123
 124         if (mcast->ah)
 125                 ipoib_put_ah(mcast->ah);
 126
 127         while (!skb_queue_empty(&mcast->pkt_queue)) {
 128                 ++tx_dropped;
 129                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 130         }
 131
 132         spin_lock_irqsave(&priv->tx_lock, flags);
 133         priv->stats.tx_dropped += tx_dropped;
 134         spin_unlock_irqrestore(&priv->tx_lock, flags);
 135
 136         kfree(mcast);
 137 }
 138
 139 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 140                                              int can_sleep)
 141 {
 142         struct ipoib_mcast *mcast;
 143
 144         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 145         if (!mcast)
 146                 return NULL;
 147
 148         mcast->dev = dev;
 149         mcast->created = jiffies;
 150         mcast->backoff = 1;
 151
 152         INIT_LIST_HEAD(&mcast->list);
 153         INIT_LIST_HEAD(&mcast->neigh_list);
 154         skb_queue_head_init(&mcast->pkt_queue);
 155
 156         return mcast;
 157 }
 158
 159 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, union ib_gid *mgid)
 160 {
 161         struct ipoib_dev_priv *priv = netdev_priv(dev);
 162         struct rb_node *n = priv->multicast_tree.rb_node;
 163
 164         while (n) {
 165                 struct ipoib_mcast *mcast;
 166                 int ret;
 167
 168                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 169
 170                 ret = memcmp(mgid->raw, mcast->mcmember.mgid.raw,
 171                              sizeof (union ib_gid));
 172                 if (ret < 0)
 173                         n = n->rb_left;
 174                 else if (ret > 0)
 175                         n = n->rb_right;
 176                 else
 177                         return mcast;
 178         }
 179
 180         return NULL;
 181 }
 182
 183 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 184 {
 185         struct ipoib_dev_priv *priv = netdev_priv(dev);
 186         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 187
 188         while (*n) {
 189                 struct ipoib_mcast *tmcast;
 190                 int ret;
 191
 192                 pn = *n;
 193                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 194
 195                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 196                              sizeof (union ib_gid));
 197                 if (ret < 0)
 198                         n = &pn->rb_left;
 199                 else if (ret > 0)
 200                         n = &pn->rb_right;
 201                 else
 202                         return -EEXIST;
 203         }
 204
 205         rb_link_node(&mcast->rb_node, pn, n);
 206         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 207
 208         return 0;
 209 }
 210
 211 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 212                                    struct ib_sa_mcmember_rec *mcmember)
 213 {
 214         struct net_device *dev = mcast->dev;
 215         struct ipoib_dev_priv *priv = netdev_priv(dev);
 216         struct ipoib_ah *ah;
 217         int ret;
 218
 219         mcast->mcmember = *mcmember;
 220
 221         /* Set the cached Q_Key before we attach if it's the broadcast group */
 222         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 223                     sizeof (union ib_gid))) {
 224                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 225                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 226         }
 227
 228         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 229                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 230                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 231                                    " already attached\n",
 232                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 233
 234                         return 0;
 235                 }
 236
 237                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 238                                          &mcast->mcmember.mgid);
 239                 if (ret < 0) {
 240                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 241                                    IPOIB_GID_FMT "\n",
 242                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 243
 244                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 245                         return ret;
 246                 }
 247         }
 248
 249         {
 250                 struct ib_ah_attr av = {
 251                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 252                         .port_num      = priv->port,
 253                         .sl            = mcast->mcmember.sl,
 254                         .ah_flags      = IB_AH_GRH,
 255                         .grh           = {
 256                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 257                                 .hop_limit     = mcast->mcmember.hop_limit,
 258                                 .sgid_index    = 0,
 259                                 .traffic_class = mcast->mcmember.traffic_class
 260                         }
 261                 };
 262                 int path_rate = ib_sa_rate_enum_to_int(mcast->mcmember.rate);
 263
 264                 av.grh.dgid = mcast->mcmember.mgid;
 265
 266                 if (path_rate > 0 && priv->local_rate > path_rate)
 267                         av.static_rate = (priv->local_rate - 1) / path_rate;
 268
 269                 ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n",
 270                                 av.static_rate, priv->local_rate,
 271                                 ib_sa_rate_enum_to_int(mcast->mcmember.rate));
 272
 273                 ah = ipoib_create_ah(dev, priv->pd, &av);
 274                 if (!ah) {
 275                         ipoib_warn(priv, "ib_address_create failed\n");
 276                 } else {
 277                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 278                                         " AV %p, LID 0x%04x, SL %d\n",
 279                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 280                                         mcast->ah->ah,
 281                                         be16_to_cpu(mcast->mcmember.mlid),
 282                                         mcast->mcmember.sl);
 283                 }
 284
 285                 spin_lock_irq(&priv->lock);
 286                 mcast->ah = ah;
 287                 spin_unlock_irq(&priv->lock);
 288         }
 289
 290         /* actually send any queued packets */
 291         spin_lock_irq(&priv->tx_lock);
 292         while (!skb_queue_empty(&mcast->pkt_queue)) {
 293                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 294                 spin_unlock_irq(&priv->tx_lock);
 295
 296                 skb->dev = dev;
 297
 298                 if (!skb->dst || !skb->dst->neighbour) {
 299                         /* put pseudoheader back on for next time */
 300                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 301                 }
 302
 303                 if (dev_queue_xmit(skb))
 304                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 305                 spin_lock_irq(&priv->tx_lock);
 306         }
 307         spin_unlock_irq(&priv->tx_lock);
 308
 309         return 0;
 310 }
 311
 312 static void
 313 ipoib_mcast_sendonly_join_complete(int status,
 314                                    struct ib_sa_mcmember_rec *mcmember,
 315                                    void *mcast_ptr)
 316 {
 317         struct ipoib_mcast *mcast = mcast_ptr;
 318         struct net_device *dev = mcast->dev;
 319         struct ipoib_dev_priv *priv = netdev_priv(dev);
 320
 321         if (!status)
 322                 ipoib_mcast_join_finish(mcast, mcmember);
 323         else {
 324                 if (mcast->logcount++ < 20)
 325                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 326                                         IPOIB_GID_FMT ", status %d\n",
 327                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 328
 329                 /* Flush out any queued packets */
 330                 spin_lock_irq(&priv->tx_lock);
 331                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 332                         ++priv->stats.tx_dropped;
 333                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 334                 }
 335                 spin_unlock_irq(&priv->tx_lock);
 336
 337                 /* Clear the busy flag so we try again */
 338                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 339         }
 340
 341         complete(&mcast->done);
 342 }
 343
 344 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 345 {
 346         struct net_device *dev = mcast->dev;
 347         struct ipoib_dev_priv *priv = netdev_priv(dev);
 348         struct ib_sa_mcmember_rec rec = {
 349 #if 0                           /* Some SMs don't support send-only yet */
 350                 .join_state = 4
 351 #else
 352                 .join_state = 1
 353 #endif
 354         };
 355         int ret = 0;
 356
 357         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 358                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 359                 return -ENODEV;
 360         }
 361
 362         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 363                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 364                 return -EBUSY;
 365         }
 366
 367         rec.mgid     = mcast->mcmember.mgid;
 368         rec.port_gid = priv->local_gid;
 369         rec.pkey     = cpu_to_be16(priv->pkey);
 370
 371         init_completion(&mcast->done);
 372
 373         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec,
 374                                      IB_SA_MCMEMBER_REC_MGID            |
 375                                      IB_SA_MCMEMBER_REC_PORT_GID        |
 376                                      IB_SA_MCMEMBER_REC_PKEY            |
 377                                      IB_SA_MCMEMBER_REC_JOIN_STATE,
 378                                      1000, GFP_ATOMIC,
 379                                      ipoib_mcast_sendonly_join_complete,
 380                                      mcast, &mcast->query);
 381         if (ret < 0) {
 382                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed (ret = %d)\n",
 383                            ret);
 384         } else {
 385                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 386                                 ", starting join\n",
 387                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 388
 389                 mcast->query_id = ret;
 390         }
 391
 392         return ret;
 393 }
 394
 395 static void ipoib_mcast_join_complete(int status,
 396                                       struct ib_sa_mcmember_rec *mcmember,
 397                                       void *mcast_ptr)
 398 {
 399         struct ipoib_mcast *mcast = mcast_ptr;
 400         struct net_device *dev = mcast->dev;
 401         struct ipoib_dev_priv *priv = netdev_priv(dev);
 402
 403         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 404                         " (status %d)\n",
 405                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 406
 407         if (!status && !ipoib_mcast_join_finish(mcast, mcmember)) {
 408                 mcast->backoff = 1;
 409                 mutex_lock(&mcast_mutex);
 410                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 411                         queue_work(ipoib_workqueue, &priv->mcast_task);
 412                 mutex_unlock(&mcast_mutex);
 413                 complete(&mcast->done);
 414                 return;
 415         }
 416
 417         if (status == -EINTR) {
 418                 complete(&mcast->done);
 419                 return;
 420         }
 421
 422         if (status && mcast->logcount++ < 20) {
 423                 if (status == -ETIMEDOUT || status == -EINTR) {
 424                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 425                                         ", status %d\n",
 426                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 427                                         status);
 428                 } else {
 429                         ipoib_warn(priv, "multicast join failed for "
 430                                    IPOIB_GID_FMT ", status %d\n",
 431                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 432                                    status);
 433                 }
 434         }
 435
 436         mcast->backoff *= 2;
 437         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 438                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 439
 440         mutex_lock(&mcast_mutex);
 441
 442         spin_lock_irq(&priv->lock);
 443         mcast->query = NULL;
 444
 445         if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
 446                 if (status == -ETIMEDOUT)
 447                         queue_work(ipoib_workqueue, &priv->mcast_task);
 448                 else
 449                         queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 450                                            mcast->backoff * HZ);
 451         } else
 452                 complete(&mcast->done);
 453         spin_unlock_irq(&priv->lock);
 454         mutex_unlock(&mcast_mutex);
 455
 456         return;
 457 }
 458
 459 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 460                              int create)
 461 {
 462         struct ipoib_dev_priv *priv = netdev_priv(dev);
 463         struct ib_sa_mcmember_rec rec = {
 464                 .join_state = 1
 465         };
 466         ib_sa_comp_mask comp_mask;
 467         int ret = 0;
 468
 469         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 470                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 471
 472         rec.mgid     = mcast->mcmember.mgid;
 473         rec.port_gid = priv->local_gid;
 474         rec.pkey     = cpu_to_be16(priv->pkey);
 475
 476         comp_mask =
 477                 IB_SA_MCMEMBER_REC_MGID         |
 478                 IB_SA_MCMEMBER_REC_PORT_GID     |
 479                 IB_SA_MCMEMBER_REC_PKEY         |
 480                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 481
 482         if (create) {
 483                 comp_mask |=
 484                         IB_SA_MCMEMBER_REC_QKEY         |
 485                         IB_SA_MCMEMBER_REC_SL           |
 486                         IB_SA_MCMEMBER_REC_FLOW_LABEL   |
 487                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
 488
 489                 rec.qkey          = priv->broadcast->mcmember.qkey;
 490                 rec.sl            = priv->broadcast->mcmember.sl;
 491                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 492                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 493         }
 494
 495         init_completion(&mcast->done);
 496
 497         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec, comp_mask,
 498                                      mcast->backoff * 1000, GFP_ATOMIC,
 499                                      ipoib_mcast_join_complete,
 500                                      mcast, &mcast->query);
 501
 502         if (ret < 0) {
 503                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
 504
 505                 mcast->backoff *= 2;
 506                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 507                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 508
 509                 mutex_lock(&mcast_mutex);
 510                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 511                         queue_delayed_work(ipoib_workqueue,
 512                                            &priv->mcast_task,
 513                                            mcast->backoff * HZ);
 514                 mutex_unlock(&mcast_mutex);
 515         } else
 516                 mcast->query_id = ret;
 517 }
 518
 519 void ipoib_mcast_join_task(void *dev_ptr)
 520 {
 521         struct net_device *dev = dev_ptr;
 522         struct ipoib_dev_priv *priv = netdev_priv(dev);
 523
 524         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 525                 return;
 526
 527         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 528                 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
 529         else
 530                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 531
 532         {
 533                 struct ib_port_attr attr;
 534
 535                 if (!ib_query_port(priv->ca, priv->port, &attr)) {
 536                         priv->local_lid  = attr.lid;
 537                         priv->local_rate = attr.active_speed *
 538                                 ib_width_enum_to_int(attr.active_width);
 539                 } else
 540                         ipoib_warn(priv, "ib_query_port failed\n");
 541         }
 542
 543         if (!priv->broadcast) {
 544                 struct ipoib_mcast *broadcast;
 545
 546                 broadcast = ipoib_mcast_alloc(dev, 1);
 547                 if (!broadcast) {
 548                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 549                         mutex_lock(&mcast_mutex);
 550                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 551                                 queue_delayed_work(ipoib_workqueue,
 552                                                    &priv->mcast_task, HZ);
 553                         mutex_unlock(&mcast_mutex);
 554                         return;
 555                 }
 556
 557                 spin_lock_irq(&priv->lock);
 558                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 559                        sizeof (union ib_gid));
 560                 priv->broadcast = broadcast;
 561
 562                 __ipoib_mcast_add(dev, priv->broadcast);
 563                 spin_unlock_irq(&priv->lock);
 564         }
 565
 566         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 567                 ipoib_mcast_join(dev, priv->broadcast, 0);
 568                 return;
 569         }
 570
 571         while (1) {
 572                 struct ipoib_mcast *mcast = NULL;
 573
 574                 spin_lock_irq(&priv->lock);
 575                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 576                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 577                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 578                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 579                                 /* Found the next unjoined group */
 580                                 break;
 581                         }
 582                 }
 583                 spin_unlock_irq(&priv->lock);
 584
 585                 if (&mcast->list == &priv->multicast_list) {
 586                         /* All done */
 587                         break;
 588                 }
 589
 590                 ipoib_mcast_join(dev, mcast, 1);
 591                 return;
 592         }
 593
 594         priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
 595                 IPOIB_ENCAP_LEN;
 596         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 597
 598         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 599
 600         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 601         netif_carrier_on(dev);
 602 }
 603
 604 int ipoib_mcast_start_thread(struct net_device *dev)
 605 {
 606         struct ipoib_dev_priv *priv = netdev_priv(dev);
 607
 608         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 609
 610         mutex_lock(&mcast_mutex);
 611         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 612                 queue_work(ipoib_workqueue, &priv->mcast_task);
 613         mutex_unlock(&mcast_mutex);
 614
 615         spin_lock_irq(&priv->lock);
 616         set_bit(IPOIB_MCAST_STARTED, &priv->flags);
 617         spin_unlock_irq(&priv->lock);
 618
 619         return 0;
 620 }
 621
 622 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 623 {
 624         struct ipoib_dev_priv *priv = netdev_priv(dev);
 625         struct ipoib_mcast *mcast;
 626
 627         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 628
 629         spin_lock_irq(&priv->lock);
 630         clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
 631         spin_unlock_irq(&priv->lock);
 632
 633         mutex_lock(&mcast_mutex);
 634         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 635         cancel_delayed_work(&priv->mcast_task);
 636         mutex_unlock(&mcast_mutex);
 637
 638         if (flush)
 639                 flush_workqueue(ipoib_workqueue);
 640
 641         spin_lock_irq(&priv->lock);
 642         if (priv->broadcast && priv->broadcast->query) {
 643                 ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
 644                 priv->broadcast->query = NULL;
 645                 spin_unlock_irq(&priv->lock);
 646                 ipoib_dbg_mcast(priv, "waiting for bcast\n");
 647                 wait_for_completion(&priv->broadcast->done);
 648         } else
 649                 spin_unlock_irq(&priv->lock);
 650
 651         list_for_each_entry(mcast, &priv->multicast_list, list) {
 652                 spin_lock_irq(&priv->lock);
 653                 if (mcast->query) {
 654                         ib_sa_cancel_query(mcast->query_id, mcast->query);
 655                         mcast->query = NULL;
 656                         spin_unlock_irq(&priv->lock);
 657                         ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
 658                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 659                         wait_for_completion(&mcast->done);
 660                 } else
 661                         spin_unlock_irq(&priv->lock);
 662         }
 663
 664         return 0;
 665 }
 666
 667 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 668 {
 669         struct ipoib_dev_priv *priv = netdev_priv(dev);
 670         struct ib_sa_mcmember_rec rec = {
 671                 .join_state = 1
 672         };
 673         int ret = 0;
 674
 675         if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
 676                 return 0;
 677
 678         ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 679                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 680
 681         rec.mgid     = mcast->mcmember.mgid;
 682         rec.port_gid = priv->local_gid;
 683         rec.pkey     = cpu_to_be16(priv->pkey);
 684
 685         /* Remove ourselves from the multicast group */
 686         ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
 687                                  &mcast->mcmember.mgid);
 688         if (ret)
 689                 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
 690
 691         /*
 692          * Just make one shot at leaving and don't wait for a reply;
 693          * if we fail, too bad.
 694          */
 695         ret = ib_sa_mcmember_rec_delete(priv->ca, priv->port, &rec,
 696                                         IB_SA_MCMEMBER_REC_MGID         |
 697                                         IB_SA_MCMEMBER_REC_PORT_GID     |
 698                                         IB_SA_MCMEMBER_REC_PKEY         |
 699                                         IB_SA_MCMEMBER_REC_JOIN_STATE,
 700                                         0, GFP_ATOMIC, NULL,
 701                                         mcast, &mcast->query);
 702         if (ret < 0)
 703                 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
 704                            "for leave (result = %d)\n", ret);
 705
 706         return 0;
 707 }
 708
 709 void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
 710                       struct sk_buff *skb)
 711 {
 712         struct ipoib_dev_priv *priv = netdev_priv(dev);
 713         struct ipoib_mcast *mcast;
 714
 715         /*
 716          * We can only be called from ipoib_start_xmit, so we're
 717          * inside tx_lock -- no need to save/restore flags.
 718          */
 719         spin_lock(&priv->lock);
 720
 721         if (!test_bit(IPOIB_MCAST_STARTED, &priv->flags)        ||
 722             !priv->broadcast                                    ||
 723             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 724                 ++priv->stats.tx_dropped;
 725                 dev_kfree_skb_any(skb);
 726                 goto unlock;
 727         }
 728
 729         mcast = __ipoib_mcast_find(dev, mgid);
 730         if (!mcast) {
 731                 /* Let's create a new send only group now */
 732                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 733                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(*mgid));
 734
 735                 mcast = ipoib_mcast_alloc(dev, 0);
 736                 if (!mcast) {
 737                         ipoib_warn(priv, "unable to allocate memory for "
 738                                    "multicast structure\n");
 739                         ++priv->stats.tx_dropped;
 740                         dev_kfree_skb_any(skb);
 741                         goto out;
 742                 }
 743
 744                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 745                 mcast->mcmember.mgid = *mgid;
 746                 __ipoib_mcast_add(dev, mcast);
 747                 list_add_tail(&mcast->list, &priv->multicast_list);
 748         }
 749
 750         if (!mcast->ah) {
 751                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 752                         skb_queue_tail(&mcast->pkt_queue, skb);
 753                 else {
 754                         ++priv->stats.tx_dropped;
 755                         dev_kfree_skb_any(skb);
 756                 }
 757
 758                 if (mcast->query)
 759                         ipoib_dbg_mcast(priv, "no address vector, "
 760                                         "but multicast join already started\n");
 761                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 762                         ipoib_mcast_sendonly_join(mcast);
 763
 764                 /*
 765                  * If lookup completes between here and out:, don't
 766                  * want to send packet twice.
 767                  */
 768                 mcast = NULL;
 769         }
 770
 771 out:
 772         if (mcast && mcast->ah) {
 773                 if (skb->dst            &&
 774                     skb->dst->neighbour &&
 775                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 776                         struct ipoib_neigh *neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 777
 778                         if (neigh) {
 779                                 kref_get(&mcast->ah->ref);
 780                                 neigh->ah       = mcast->ah;
 781                                 neigh->neighbour = skb->dst->neighbour;
 782                                 *to_ipoib_neigh(skb->dst->neighbour) = neigh;
 783                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 784                         }
 785                 }
 786
 787                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 788         }
 789
 790 unlock:
 791         spin_unlock(&priv->lock);
 792 }
 793
 794 void ipoib_mcast_dev_flush(struct net_device *dev)
 795 {
 796         struct ipoib_dev_priv *priv = netdev_priv(dev);
 797         LIST_HEAD(remove_list);
 798         struct ipoib_mcast *mcast, *tmcast;
 799         unsigned long flags;
 800
 801         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 802
 803         spin_lock_irqsave(&priv->lock, flags);
 804
 805         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 806                 list_del(&mcast->list);
 807                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 808                 list_add_tail(&mcast->list, &remove_list);
 809         }
 810
 811         if (priv->broadcast) {
 812                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 813                 list_add_tail(&priv->broadcast->list, &remove_list);
 814                 priv->broadcast = NULL;
 815         }
 816
 817         spin_unlock_irqrestore(&priv->lock, flags);
 818
 819         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 820                 ipoib_mcast_leave(dev, mcast);
 821                 ipoib_mcast_free(mcast);
 822         }
 823 }
 824
 825 void ipoib_mcast_restart_task(void *dev_ptr)
 826 {
 827         struct net_device *dev = dev_ptr;
 828         struct ipoib_dev_priv *priv = netdev_priv(dev);
 829         struct dev_mc_list *mclist;
 830         struct ipoib_mcast *mcast, *tmcast;
 831         LIST_HEAD(remove_list);
 832         unsigned long flags;
 833
 834         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 835
 836         ipoib_mcast_stop_thread(dev, 0);
 837
 838         spin_lock_irqsave(&dev->xmit_lock, flags);
 839         spin_lock(&priv->lock);
 840
 841         /*
 842          * Unfortunately, the networking core only gives us a list of all of
 843          * the multicast hardware addresses. We need to figure out which ones
 844          * are new and which ones have been removed
 845          */
 846
 847         /* Clear out the found flag */
 848         list_for_each_entry(mcast, &priv->multicast_list, list)
 849                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 850
 851         /* Mark all of the entries that are found or don't exist */
 852         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 853                 union ib_gid mgid;
 854
 855                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 856
 857                 /* Add in the P_Key */
 858                 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
 859                 mgid.raw[5] = priv->pkey & 0xff;
 860
 861                 mcast = __ipoib_mcast_find(dev, &mgid);
 862                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 863                         struct ipoib_mcast *nmcast;
 864
 865                         /* Not found or send-only group, let's add a new entry */
 866                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 867                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 868
 869                         nmcast = ipoib_mcast_alloc(dev, 0);
 870                         if (!nmcast) {
 871                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 872                                 continue;
 873                         }
 874
 875                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 876
 877                         nmcast->mcmember.mgid = mgid;
 878
 879                         if (mcast) {
 880                                 /* Destroy the send only entry */
 881                                 list_del(&mcast->list);
 882                                 list_add_tail(&mcast->list, &remove_list);
 883
 884                                 rb_replace_node(&mcast->rb_node,
 885                                                 &nmcast->rb_node,
 886                                                 &priv->multicast_tree);
 887                         } else
 888                                 __ipoib_mcast_add(dev, nmcast);
 889
 890                         list_add_tail(&nmcast->list, &priv->multicast_list);
 891                 }
 892
 893                 if (mcast)
 894                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 895         }
 896
 897         /* Remove all of the entries don't exist anymore */
 898         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 899                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 900                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 901                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 902                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 903
 904                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 905
 906                         /* Move to the remove list */
 907                         list_del(&mcast->list);
 908                         list_add_tail(&mcast->list, &remove_list);
 909                 }
 910         }
 911
 912         spin_unlock(&priv->lock);
 913         spin_unlock_irqrestore(&dev->xmit_lock, flags);
 914
 915         /* We have to cancel outside of the spinlock */
 916         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 917                 ipoib_mcast_leave(mcast->dev, mcast);
 918                 ipoib_mcast_free(mcast);
 919         }
 920
 921         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 922                 ipoib_mcast_start_thread(dev);
 923 }
 924
 925 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 926
 927 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 928 {
 929         struct ipoib_mcast_iter *iter;
 930
 931         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 932         if (!iter)
 933                 return NULL;
 934
 935         iter->dev = dev;
 936         memset(iter->mgid.raw, 0, 16);
 937
 938         if (ipoib_mcast_iter_next(iter)) {
 939                 kfree(iter);
 940                 return NULL;
 941         }
 942
 943         return iter;
 944 }
 945
 946 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 947 {
 948         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 949         struct rb_node *n;
 950         struct ipoib_mcast *mcast;
 951         int ret = 1;
 952
 953         spin_lock_irq(&priv->lock);
 954
 955         n = rb_first(&priv->multicast_tree);
 956
 957         while (n) {
 958                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 959
 960                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 961                            sizeof (union ib_gid)) < 0) {
 962                         iter->mgid      = mcast->mcmember.mgid;
 963                         iter->created   = mcast->created;
 964                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 965                         iter->complete  = !!mcast->ah;
 966                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 967
 968                         ret = 0;
 969
 970                         break;
 971                 }
 972
 973                 n = rb_next(n);
 974         }
 975
 976         spin_unlock_irq(&priv->lock);
 977
 978         return ret;
 979 }
 980
 981 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 982                            union ib_gid *mgid,
 983                            unsigned long *created,
 984                            unsigned int *queuelen,
 985                            unsigned int *complete,
 986                            unsigned int *send_only)
 987 {
 988         *mgid      = iter->mgid;
 989         *created   = iter->created;
 990         *queuelen  = iter->queuelen;
 991         *complete  = iter->complete;
 992         *send_only = iter->send_only;
 993 }
 994
 995 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */