drivers/infiniband/ulp/ipoib/ipoib_multicast.c

   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
  35 #include <linux/skbuff.h>
  36 #include <linux/rtnetlink.h>
  37 #include <linux/ip.h>
  38 #include <linux/in.h>
  39 #include <linux/igmp.h>
  40 #include <linux/inetdevice.h>
  41 #include <linux/delay.h>
  42 #include <linux/completion.h>
  43
  44 #include <net/dst.h>
  45
  46 #include "ipoib.h"
  47
  48 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  49 static int mcast_debug_level;
  50
  51 module_param(mcast_debug_level, int, 0644);
  52 MODULE_PARM_DESC(mcast_debug_level,
  53                  "Enable multicast debug tracing if > 0");
  54 #endif
  55
  56 static DEFINE_MUTEX(mcast_mutex);
  57
  58 struct ipoib_mcast_iter {
  59         struct net_device *dev;
  60         union ib_gid       mgid;
  61         unsigned long      created;
  62         unsigned int       queuelen;
  63         unsigned int       complete;
  64         unsigned int       send_only;
  65 };
  66
  67 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  68 {
  69         struct net_device *dev = mcast->dev;
  70         struct ipoib_dev_priv *priv = netdev_priv(dev);
  71         struct ipoib_neigh *neigh, *tmp;
  72         int tx_dropped = 0;
  73
  74         ipoib_dbg_mcast(netdev_priv(dev),
  75                         "deleting multicast group " IPOIB_GID_FMT "\n",
  76                         IPOIB_GID_ARG(mcast->mcmember.mgid));
  77
  78         spin_lock_irq(&priv->lock);
  79
  80         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
  81                 /*
  82                  * It's safe to call ipoib_put_ah() inside priv->lock
  83                  * here, because we know that mcast->ah will always
  84                  * hold one more reference, so ipoib_put_ah() will
  85                  * never do more than decrement the ref count.
  86                  */
  87                 if (neigh->ah)
  88                         ipoib_put_ah(neigh->ah);
  89                 ipoib_neigh_free(dev, neigh);
  90         }
  91
  92         spin_unlock_irq(&priv->lock);
  93
  94         if (mcast->ah)
  95                 ipoib_put_ah(mcast->ah);
  96
  97         while (!skb_queue_empty(&mcast->pkt_queue)) {
  98                 ++tx_dropped;
  99                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 100         }
 101
 102         netif_tx_lock_bh(dev);
 103         dev->stats.tx_dropped += tx_dropped;
 104         netif_tx_unlock_bh(dev);
 105
 106         kfree(mcast);
 107 }
 108
 109 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 110                                              int can_sleep)
 111 {
 112         struct ipoib_mcast *mcast;
 113
 114         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 115         if (!mcast)
 116                 return NULL;
 117
 118         mcast->dev = dev;
 119         mcast->created = jiffies;
 120         mcast->backoff = 1;
 121
 122         INIT_LIST_HEAD(&mcast->list);
 123         INIT_LIST_HEAD(&mcast->neigh_list);
 124         skb_queue_head_init(&mcast->pkt_queue);
 125
 126         return mcast;
 127 }
 128
 129 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 130 {
 131         struct ipoib_dev_priv *priv = netdev_priv(dev);
 132         struct rb_node *n = priv->multicast_tree.rb_node;
 133
 134         while (n) {
 135                 struct ipoib_mcast *mcast;
 136                 int ret;
 137
 138                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 139
 140                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 141                              sizeof (union ib_gid));
 142                 if (ret < 0)
 143                         n = n->rb_left;
 144                 else if (ret > 0)
 145                         n = n->rb_right;
 146                 else
 147                         return mcast;
 148         }
 149
 150         return NULL;
 151 }
 152
 153 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 154 {
 155         struct ipoib_dev_priv *priv = netdev_priv(dev);
 156         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 157
 158         while (*n) {
 159                 struct ipoib_mcast *tmcast;
 160                 int ret;
 161
 162                 pn = *n;
 163                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 164
 165                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 166                              sizeof (union ib_gid));
 167                 if (ret < 0)
 168                         n = &pn->rb_left;
 169                 else if (ret > 0)
 170                         n = &pn->rb_right;
 171                 else
 172                         return -EEXIST;
 173         }
 174
 175         rb_link_node(&mcast->rb_node, pn, n);
 176         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 177
 178         return 0;
 179 }
 180
 181 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 182                                    struct ib_sa_mcmember_rec *mcmember)
 183 {
 184         struct net_device *dev = mcast->dev;
 185         struct ipoib_dev_priv *priv = netdev_priv(dev);
 186         struct ipoib_ah *ah;
 187         int ret;
 188         int set_qkey = 0;
 189
 190         mcast->mcmember = *mcmember;
 191
 192         /* Set the cached Q_Key before we attach if it's the broadcast group */
 193         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 194                     sizeof (union ib_gid))) {
 195                 spin_lock_irq(&priv->lock);
 196                 if (!priv->broadcast) {
 197                         spin_unlock_irq(&priv->lock);
 198                         return -EAGAIN;
 199                 }
 200                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 201                 spin_unlock_irq(&priv->lock);
 202                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 203                 set_qkey = 1;
 204         }
 205
 206         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 207                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 208                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 209                                    " already attached\n",
 210                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 211
 212                         return 0;
 213                 }
 214
 215                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 216                                          &mcast->mcmember.mgid, set_qkey);
 217                 if (ret < 0) {
 218                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 219                                    IPOIB_GID_FMT "\n",
 220                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 221
 222                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 223                         return ret;
 224                 }
 225         }
 226
 227         {
 228                 struct ib_ah_attr av = {
 229                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 230                         .port_num      = priv->port,
 231                         .sl            = mcast->mcmember.sl,
 232                         .ah_flags      = IB_AH_GRH,
 233                         .static_rate   = mcast->mcmember.rate,
 234                         .grh           = {
 235                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 236                                 .hop_limit     = mcast->mcmember.hop_limit,
 237                                 .sgid_index    = 0,
 238                                 .traffic_class = mcast->mcmember.traffic_class
 239                         }
 240                 };
 241                 av.grh.dgid = mcast->mcmember.mgid;
 242
 243                 ah = ipoib_create_ah(dev, priv->pd, &av);
 244                 if (!ah) {
 245                         ipoib_warn(priv, "ib_address_create failed\n");
 246                 } else {
 247                         spin_lock_irq(&priv->lock);
 248                         mcast->ah = ah;
 249                         spin_unlock_irq(&priv->lock);
 250
 251                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 252                                         " AV %p, LID 0x%04x, SL %d\n",
 253                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 254                                         mcast->ah->ah,
 255                                         be16_to_cpu(mcast->mcmember.mlid),
 256                                         mcast->mcmember.sl);
 257                 }
 258         }
 259
 260         /* actually send any queued packets */
 261         netif_tx_lock_bh(dev);
 262         while (!skb_queue_empty(&mcast->pkt_queue)) {
 263                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 264                 netif_tx_unlock_bh(dev);
 265
 266                 skb->dev = dev;
 267
 268                 if (!skb->dst || !skb->dst->neighbour) {
 269                         /* put pseudoheader back on for next time */
 270                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 271                 }
 272
 273                 if (dev_queue_xmit(skb))
 274                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 275                 netif_tx_lock_bh(dev);
 276         }
 277         netif_tx_unlock_bh(dev);
 278
 279         return 0;
 280 }
 281
 282 static int
 283 ipoib_mcast_sendonly_join_complete(int status,
 284                                    struct ib_sa_multicast *multicast)
 285 {
 286         struct ipoib_mcast *mcast = multicast->context;
 287         struct net_device *dev = mcast->dev;
 288
 289         /* We trap for port events ourselves. */
 290         if (status == -ENETRESET)
 291                 return 0;
 292
 293         if (!status)
 294                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 295
 296         if (status) {
 297                 if (mcast->logcount++ < 20)
 298                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 299                                         IPOIB_GID_FMT ", status %d\n",
 300                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 301
 302                 /* Flush out any queued packets */
 303                 netif_tx_lock_bh(dev);
 304                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 305                         ++dev->stats.tx_dropped;
 306                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 307                 }
 308                 netif_tx_unlock_bh(dev);
 309
 310                 /* Clear the busy flag so we try again */
 311                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
 312                                             &mcast->flags);
 313         }
 314         return status;
 315 }
 316
 317 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 318 {
 319         struct net_device *dev = mcast->dev;
 320         struct ipoib_dev_priv *priv = netdev_priv(dev);
 321         struct ib_sa_mcmember_rec rec = {
 322 #if 0                           /* Some SMs don't support send-only yet */
 323                 .join_state = 4
 324 #else
 325                 .join_state = 1
 326 #endif
 327         };
 328         int ret = 0;
 329
 330         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 331                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 332                 return -ENODEV;
 333         }
 334
 335         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 336                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 337                 return -EBUSY;
 338         }
 339
 340         rec.mgid     = mcast->mcmember.mgid;
 341         rec.port_gid = priv->local_gid;
 342         rec.pkey     = cpu_to_be16(priv->pkey);
 343
 344         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 345                                          priv->port, &rec,
 346                                          IB_SA_MCMEMBER_REC_MGID        |
 347                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 348                                          IB_SA_MCMEMBER_REC_PKEY        |
 349                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 350                                          GFP_ATOMIC,
 351                                          ipoib_mcast_sendonly_join_complete,
 352                                          mcast);
 353         if (IS_ERR(mcast->mc)) {
 354                 ret = PTR_ERR(mcast->mc);
 355                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 356                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
 357                            ret);
 358         } else {
 359                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 360                                 ", starting join\n",
 361                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 362         }
 363
 364         return ret;
 365 }
 366
 367 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 368 {
 369         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 370                                                    carrier_on_task);
 371
 372         /*
 373          * Take rtnl_lock to avoid racing with ipoib_stop() and
 374          * turning the carrier back on while a device is being
 375          * removed.
 376          */
 377         rtnl_lock();
 378         netif_carrier_on(priv->dev);
 379         rtnl_unlock();
 380 }
 381
 382 static int ipoib_mcast_join_complete(int status,
 383                                      struct ib_sa_multicast *multicast)
 384 {
 385         struct ipoib_mcast *mcast = multicast->context;
 386         struct net_device *dev = mcast->dev;
 387         struct ipoib_dev_priv *priv = netdev_priv(dev);
 388
 389         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 390                         " (status %d)\n",
 391                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 392
 393         /* We trap for port events ourselves. */
 394         if (status == -ENETRESET)
 395                 return 0;
 396
 397         if (!status)
 398                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 399
 400         if (!status) {
 401                 mcast->backoff = 1;
 402                 mutex_lock(&mcast_mutex);
 403                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 404                         queue_delayed_work(ipoib_workqueue,
 405                                            &priv->mcast_task, 0);
 406                 mutex_unlock(&mcast_mutex);
 407
 408                 /*
 409                  * Defer carrier on work to ipoib_workqueue to avoid a
 410                  * deadlock on rtnl_lock here.
 411                  */
 412                 if (mcast == priv->broadcast)
 413                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
 414
 415                 return 0;
 416         }
 417
 418         if (mcast->logcount++ < 20) {
 419                 if (status == -ETIMEDOUT) {
 420                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 421                                         ", status %d\n",
 422                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 423                                         status);
 424                 } else {
 425                         ipoib_warn(priv, "multicast join failed for "
 426                                    IPOIB_GID_FMT ", status %d\n",
 427                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 428                                    status);
 429                 }
 430         }
 431
 432         mcast->backoff *= 2;
 433         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 434                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 435
 436         /* Clear the busy flag so we try again */
 437         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 438
 439         mutex_lock(&mcast_mutex);
 440         spin_lock_irq(&priv->lock);
 441         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 442                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 443                                    mcast->backoff * HZ);
 444         spin_unlock_irq(&priv->lock);
 445         mutex_unlock(&mcast_mutex);
 446
 447         return status;
 448 }
 449
 450 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 451                              int create)
 452 {
 453         struct ipoib_dev_priv *priv = netdev_priv(dev);
 454         struct ib_sa_mcmember_rec rec = {
 455                 .join_state = 1
 456         };
 457         ib_sa_comp_mask comp_mask;
 458         int ret = 0;
 459
 460         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 461                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 462
 463         rec.mgid     = mcast->mcmember.mgid;
 464         rec.port_gid = priv->local_gid;
 465         rec.pkey     = cpu_to_be16(priv->pkey);
 466
 467         comp_mask =
 468                 IB_SA_MCMEMBER_REC_MGID         |
 469                 IB_SA_MCMEMBER_REC_PORT_GID     |
 470                 IB_SA_MCMEMBER_REC_PKEY         |
 471                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 472
 473         if (create) {
 474                 comp_mask |=
 475                         IB_SA_MCMEMBER_REC_QKEY                 |
 476                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 477                         IB_SA_MCMEMBER_REC_MTU                  |
 478                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 479                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 480                         IB_SA_MCMEMBER_REC_RATE                 |
 481                         IB_SA_MCMEMBER_REC_SL                   |
 482                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 483                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 484
 485                 rec.qkey          = priv->broadcast->mcmember.qkey;
 486                 rec.mtu_selector  = IB_SA_EQ;
 487                 rec.mtu           = priv->broadcast->mcmember.mtu;
 488                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 489                 rec.rate_selector = IB_SA_EQ;
 490                 rec.rate          = priv->broadcast->mcmember.rate;
 491                 rec.sl            = priv->broadcast->mcmember.sl;
 492                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 493                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 494         }
 495
 496         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 497         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 498                                          &rec, comp_mask, GFP_KERNEL,
 499                                          ipoib_mcast_join_complete, mcast);
 500         if (IS_ERR(mcast->mc)) {
 501                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 502                 ret = PTR_ERR(mcast->mc);
 503                 ipoib_warn(priv, "ib_sa_join_multicast 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         }
 516 }
 517
 518 void ipoib_mcast_join_task(struct work_struct *work)
 519 {
 520         struct ipoib_dev_priv *priv =
 521                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 522         struct net_device *dev = 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_query_gid() 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                 else
 538                         ipoib_warn(priv, "ib_query_port failed\n");
 539         }
 540
 541         if (!priv->broadcast) {
 542                 struct ipoib_mcast *broadcast;
 543
 544                 broadcast = ipoib_mcast_alloc(dev, 1);
 545                 if (!broadcast) {
 546                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 547                         mutex_lock(&mcast_mutex);
 548                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 549                                 queue_delayed_work(ipoib_workqueue,
 550                                                    &priv->mcast_task, HZ);
 551                         mutex_unlock(&mcast_mutex);
 552                         return;
 553                 }
 554
 555                 spin_lock_irq(&priv->lock);
 556                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 557                        sizeof (union ib_gid));
 558                 priv->broadcast = broadcast;
 559
 560                 __ipoib_mcast_add(dev, priv->broadcast);
 561                 spin_unlock_irq(&priv->lock);
 562         }
 563
 564         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 565                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 566                         ipoib_mcast_join(dev, priv->broadcast, 0);
 567                 return;
 568         }
 569
 570         while (1) {
 571                 struct ipoib_mcast *mcast = NULL;
 572
 573                 spin_lock_irq(&priv->lock);
 574                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 575                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 576                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 577                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 578                                 /* Found the next unjoined group */
 579                                 break;
 580                         }
 581                 }
 582                 spin_unlock_irq(&priv->lock);
 583
 584                 if (&mcast->list == &priv->multicast_list) {
 585                         /* All done */
 586                         break;
 587                 }
 588
 589                 ipoib_mcast_join(dev, mcast, 1);
 590                 return;
 591         }
 592
 593         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 594
 595         if (!ipoib_cm_admin_enabled(dev)) {
 596                 rtnl_lock();
 597                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
 598                 rtnl_unlock();
 599         }
 600
 601         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 602
 603         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 604 }
 605
 606 int ipoib_mcast_start_thread(struct net_device *dev)
 607 {
 608         struct ipoib_dev_priv *priv = netdev_priv(dev);
 609
 610         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 611
 612         mutex_lock(&mcast_mutex);
 613         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 614                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 615         mutex_unlock(&mcast_mutex);
 616
 617         return 0;
 618 }
 619
 620 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 621 {
 622         struct ipoib_dev_priv *priv = netdev_priv(dev);
 623
 624         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 625
 626         mutex_lock(&mcast_mutex);
 627         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 628         cancel_delayed_work(&priv->mcast_task);
 629         mutex_unlock(&mcast_mutex);
 630
 631         if (flush)
 632                 flush_workqueue(ipoib_workqueue);
 633
 634         return 0;
 635 }
 636
 637 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 638 {
 639         struct ipoib_dev_priv *priv = netdev_priv(dev);
 640         int ret = 0;
 641
 642         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 643                 ib_sa_free_multicast(mcast->mc);
 644
 645         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 646                 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 647                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 648
 649                 /* Remove ourselves from the multicast group */
 650                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 651                                       be16_to_cpu(mcast->mcmember.mlid));
 652                 if (ret)
 653                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 654         }
 655
 656         return 0;
 657 }
 658
 659 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 660 {
 661         struct ipoib_dev_priv *priv = netdev_priv(dev);
 662         struct ipoib_mcast *mcast;
 663         unsigned long flags;
 664
 665         spin_lock_irqsave(&priv->lock, flags);
 666
 667         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 668             !priv->broadcast                                    ||
 669             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 670                 ++dev->stats.tx_dropped;
 671                 dev_kfree_skb_any(skb);
 672                 goto unlock;
 673         }
 674
 675         mcast = __ipoib_mcast_find(dev, mgid);
 676         if (!mcast) {
 677                 /* Let's create a new send only group now */
 678                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 679                                 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
 680
 681                 mcast = ipoib_mcast_alloc(dev, 0);
 682                 if (!mcast) {
 683                         ipoib_warn(priv, "unable to allocate memory for "
 684                                    "multicast structure\n");
 685                         ++dev->stats.tx_dropped;
 686                         dev_kfree_skb_any(skb);
 687                         goto out;
 688                 }
 689
 690                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 691                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 692                 __ipoib_mcast_add(dev, mcast);
 693                 list_add_tail(&mcast->list, &priv->multicast_list);
 694         }
 695
 696         if (!mcast->ah) {
 697                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 698                         skb_queue_tail(&mcast->pkt_queue, skb);
 699                 else {
 700                         ++dev->stats.tx_dropped;
 701                         dev_kfree_skb_any(skb);
 702                 }
 703
 704                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 705                         ipoib_dbg_mcast(priv, "no address vector, "
 706                                         "but multicast join already started\n");
 707                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 708                         ipoib_mcast_sendonly_join(mcast);
 709
 710                 /*
 711                  * If lookup completes between here and out:, don't
 712                  * want to send packet twice.
 713                  */
 714                 mcast = NULL;
 715         }
 716
 717 out:
 718         if (mcast && mcast->ah) {
 719                 if (skb->dst            &&
 720                     skb->dst->neighbour &&
 721                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 722                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
 723                                                                         skb->dev);
 724
 725                         if (neigh) {
 726                                 kref_get(&mcast->ah->ref);
 727                                 neigh->ah       = mcast->ah;
 728                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 729                         }
 730                 }
 731
 732                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 733         }
 734
 735 unlock:
 736         spin_unlock_irqrestore(&priv->lock, flags);
 737 }
 738
 739 void ipoib_mcast_dev_flush(struct net_device *dev)
 740 {
 741         struct ipoib_dev_priv *priv = netdev_priv(dev);
 742         LIST_HEAD(remove_list);
 743         struct ipoib_mcast *mcast, *tmcast;
 744         unsigned long flags;
 745
 746         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 747
 748         spin_lock_irqsave(&priv->lock, flags);
 749
 750         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 751                 list_del(&mcast->list);
 752                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 753                 list_add_tail(&mcast->list, &remove_list);
 754         }
 755
 756         if (priv->broadcast) {
 757                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 758                 list_add_tail(&priv->broadcast->list, &remove_list);
 759                 priv->broadcast = NULL;
 760         }
 761
 762         spin_unlock_irqrestore(&priv->lock, flags);
 763
 764         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 765                 ipoib_mcast_leave(dev, mcast);
 766                 ipoib_mcast_free(mcast);
 767         }
 768 }
 769
 770 void ipoib_mcast_restart_task(struct work_struct *work)
 771 {
 772         struct ipoib_dev_priv *priv =
 773                 container_of(work, struct ipoib_dev_priv, restart_task);
 774         struct net_device *dev = priv->dev;
 775         struct dev_mc_list *mclist;
 776         struct ipoib_mcast *mcast, *tmcast;
 777         LIST_HEAD(remove_list);
 778         unsigned long flags;
 779         struct ib_sa_mcmember_rec rec;
 780
 781         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 782
 783         ipoib_mcast_stop_thread(dev, 0);
 784
 785         local_irq_save(flags);
 786         netif_addr_lock(dev);
 787         spin_lock(&priv->lock);
 788
 789         /*
 790          * Unfortunately, the networking core only gives us a list of all of
 791          * the multicast hardware addresses. We need to figure out which ones
 792          * are new and which ones have been removed
 793          */
 794
 795         /* Clear out the found flag */
 796         list_for_each_entry(mcast, &priv->multicast_list, list)
 797                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 798
 799         /* Mark all of the entries that are found or don't exist */
 800         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 801                 union ib_gid mgid;
 802
 803                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 804
 805                 mcast = __ipoib_mcast_find(dev, &mgid);
 806                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 807                         struct ipoib_mcast *nmcast;
 808
 809                         /* ignore group which is directly joined by userspace */
 810                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 811                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 812                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid "
 813                                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 814                                 continue;
 815                         }
 816
 817                         /* Not found or send-only group, let's add a new entry */
 818                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 819                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 820
 821                         nmcast = ipoib_mcast_alloc(dev, 0);
 822                         if (!nmcast) {
 823                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 824                                 continue;
 825                         }
 826
 827                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 828
 829                         nmcast->mcmember.mgid = mgid;
 830
 831                         if (mcast) {
 832                                 /* Destroy the send only entry */
 833                                 list_move_tail(&mcast->list, &remove_list);
 834
 835                                 rb_replace_node(&mcast->rb_node,
 836                                                 &nmcast->rb_node,
 837                                                 &priv->multicast_tree);
 838                         } else
 839                                 __ipoib_mcast_add(dev, nmcast);
 840
 841                         list_add_tail(&nmcast->list, &priv->multicast_list);
 842                 }
 843
 844                 if (mcast)
 845                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 846         }
 847
 848         /* Remove all of the entries don't exist anymore */
 849         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 850                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 851                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 852                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 853                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 854
 855                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 856
 857                         /* Move to the remove list */
 858                         list_move_tail(&mcast->list, &remove_list);
 859                 }
 860         }
 861
 862         spin_unlock(&priv->lock);
 863         netif_addr_unlock(dev);
 864         local_irq_restore(flags);
 865
 866         /* We have to cancel outside of the spinlock */
 867         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 868                 ipoib_mcast_leave(mcast->dev, mcast);
 869                 ipoib_mcast_free(mcast);
 870         }
 871
 872         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 873                 ipoib_mcast_start_thread(dev);
 874 }
 875
 876 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 877
 878 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 879 {
 880         struct ipoib_mcast_iter *iter;
 881
 882         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 883         if (!iter)
 884                 return NULL;
 885
 886         iter->dev = dev;
 887         memset(iter->mgid.raw, 0, 16);
 888
 889         if (ipoib_mcast_iter_next(iter)) {
 890                 kfree(iter);
 891                 return NULL;
 892         }
 893
 894         return iter;
 895 }
 896
 897 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 898 {
 899         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 900         struct rb_node *n;
 901         struct ipoib_mcast *mcast;
 902         int ret = 1;
 903
 904         spin_lock_irq(&priv->lock);
 905
 906         n = rb_first(&priv->multicast_tree);
 907
 908         while (n) {
 909                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 910
 911                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 912                            sizeof (union ib_gid)) < 0) {
 913                         iter->mgid      = mcast->mcmember.mgid;
 914                         iter->created   = mcast->created;
 915                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 916                         iter->complete  = !!mcast->ah;
 917                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 918
 919                         ret = 0;
 920
 921                         break;
 922                 }
 923
 924                 n = rb_next(n);
 925         }
 926
 927         spin_unlock_irq(&priv->lock);
 928
 929         return ret;
 930 }
 931
 932 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 933                            union ib_gid *mgid,
 934                            unsigned long *created,
 935                            unsigned int *queuelen,
 936                            unsigned int *complete,
 937                            unsigned int *send_only)
 938 {
 939         *mgid      = iter->mgid;
 940         *created   = iter->created;
 941         *queuelen  = iter->queuelen;
 942         *complete  = iter->complete;
 943         *send_only = iter->send_only;
 944 }
 945
 946 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */