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         unsigned long flags;
  73         int tx_dropped = 0;
  74
  75         ipoib_dbg_mcast(netdev_priv(dev),
  76                         "deleting multicast group " IPOIB_GID_FMT "\n",
  77                         IPOIB_GID_ARG(mcast->mcmember.mgid));
  78
  79         spin_lock_irqsave(&priv->lock, flags);
  80
  81         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
  82                 /*
  83                  * It's safe to call ipoib_put_ah() inside priv->lock
  84                  * here, because we know that mcast->ah will always
  85                  * hold one more reference, so ipoib_put_ah() will
  86                  * never do more than decrement the ref count.
  87                  */
  88                 if (neigh->ah)
  89                         ipoib_put_ah(neigh->ah);
  90                 ipoib_neigh_free(dev, neigh);
  91         }
  92
  93         spin_unlock_irqrestore(&priv->lock, flags);
  94
  95         if (mcast->ah)
  96                 ipoib_put_ah(mcast->ah);
  97
  98         while (!skb_queue_empty(&mcast->pkt_queue)) {
  99                 ++tx_dropped;
 100                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 101         }
 102
 103         spin_lock_irqsave(&priv->tx_lock, flags);
 104         dev->stats.tx_dropped += tx_dropped;
 105         spin_unlock_irqrestore(&priv->tx_lock, flags);
 106
 107         kfree(mcast);
 108 }
 109
 110 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 111                                              int can_sleep)
 112 {
 113         struct ipoib_mcast *mcast;
 114
 115         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 116         if (!mcast)
 117                 return NULL;
 118
 119         mcast->dev = dev;
 120         mcast->created = jiffies;
 121         mcast->backoff = 1;
 122
 123         INIT_LIST_HEAD(&mcast->list);
 124         INIT_LIST_HEAD(&mcast->neigh_list);
 125         skb_queue_head_init(&mcast->pkt_queue);
 126
 127         return mcast;
 128 }
 129
 130 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 131 {
 132         struct ipoib_dev_priv *priv = netdev_priv(dev);
 133         struct rb_node *n = priv->multicast_tree.rb_node;
 134
 135         while (n) {
 136                 struct ipoib_mcast *mcast;
 137                 int ret;
 138
 139                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 140
 141                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 142                              sizeof (union ib_gid));
 143                 if (ret < 0)
 144                         n = n->rb_left;
 145                 else if (ret > 0)
 146                         n = n->rb_right;
 147                 else
 148                         return mcast;
 149         }
 150
 151         return NULL;
 152 }
 153
 154 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 155 {
 156         struct ipoib_dev_priv *priv = netdev_priv(dev);
 157         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 158
 159         while (*n) {
 160                 struct ipoib_mcast *tmcast;
 161                 int ret;
 162
 163                 pn = *n;
 164                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 165
 166                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 167                              sizeof (union ib_gid));
 168                 if (ret < 0)
 169                         n = &pn->rb_left;
 170                 else if (ret > 0)
 171                         n = &pn->rb_right;
 172                 else
 173                         return -EEXIST;
 174         }
 175
 176         rb_link_node(&mcast->rb_node, pn, n);
 177         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 178
 179         return 0;
 180 }
 181
 182 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 183                                    struct ib_sa_mcmember_rec *mcmember)
 184 {
 185         struct net_device *dev = mcast->dev;
 186         struct ipoib_dev_priv *priv = netdev_priv(dev);
 187         struct ipoib_ah *ah;
 188         int ret;
 189         int set_qkey = 0;
 190
 191         mcast->mcmember = *mcmember;
 192
 193         /* Set the cached Q_Key before we attach if it's the broadcast group */
 194         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 195                     sizeof (union ib_gid))) {
 196                 spin_lock_irq(&priv->lock);
 197                 if (!priv->broadcast) {
 198                         spin_unlock_irq(&priv->lock);
 199                         return -EAGAIN;
 200                 }
 201                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 202                 spin_unlock_irq(&priv->lock);
 203                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 204                 set_qkey = 1;
 205         }
 206
 207         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 208                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 209                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 210                                    " already attached\n",
 211                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 212
 213                         return 0;
 214                 }
 215
 216                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 217                                          &mcast->mcmember.mgid, set_qkey);
 218                 if (ret < 0) {
 219                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 220                                    IPOIB_GID_FMT "\n",
 221                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 222
 223                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 224                         return ret;
 225                 }
 226         }
 227
 228         {
 229                 struct ib_ah_attr av = {
 230                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 231                         .port_num      = priv->port,
 232                         .sl            = mcast->mcmember.sl,
 233                         .ah_flags      = IB_AH_GRH,
 234                         .static_rate   = mcast->mcmember.rate,
 235                         .grh           = {
 236                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 237                                 .hop_limit     = mcast->mcmember.hop_limit,
 238                                 .sgid_index    = 0,
 239                                 .traffic_class = mcast->mcmember.traffic_class
 240                         }
 241                 };
 242                 av.grh.dgid = mcast->mcmember.mgid;
 243
 244                 ah = ipoib_create_ah(dev, priv->pd, &av);
 245                 if (!ah) {
 246                         ipoib_warn(priv, "ib_address_create failed\n");
 247                 } else {
 248                         spin_lock_irq(&priv->lock);
 249                         mcast->ah = ah;
 250                         spin_unlock_irq(&priv->lock);
 251
 252                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 253                                         " AV %p, LID 0x%04x, SL %d\n",
 254                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 255                                         mcast->ah->ah,
 256                                         be16_to_cpu(mcast->mcmember.mlid),
 257                                         mcast->mcmember.sl);
 258                 }
 259         }
 260
 261         /* actually send any queued packets */
 262         spin_lock_irq(&priv->tx_lock);
 263         while (!skb_queue_empty(&mcast->pkt_queue)) {
 264                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 265                 spin_unlock_irq(&priv->tx_lock);
 266
 267                 skb->dev = dev;
 268
 269                 if (!skb->dst || !skb->dst->neighbour) {
 270                         /* put pseudoheader back on for next time */
 271                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 272                 }
 273
 274                 if (dev_queue_xmit(skb))
 275                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 276                 spin_lock_irq(&priv->tx_lock);
 277         }
 278         spin_unlock_irq(&priv->tx_lock);
 279
 280         return 0;
 281 }
 282
 283 static int
 284 ipoib_mcast_sendonly_join_complete(int status,
 285                                    struct ib_sa_multicast *multicast)
 286 {
 287         struct ipoib_mcast *mcast = multicast->context;
 288         struct net_device *dev = mcast->dev;
 289         struct ipoib_dev_priv *priv = netdev_priv(dev);
 290
 291         /* We trap for port events ourselves. */
 292         if (status == -ENETRESET)
 293                 return 0;
 294
 295         if (!status)
 296                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 297
 298         if (status) {
 299                 if (mcast->logcount++ < 20)
 300                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 301                                         IPOIB_GID_FMT ", status %d\n",
 302                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 303
 304                 /* Flush out any queued packets */
 305                 spin_lock_irq(&priv->tx_lock);
 306                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 307                         ++dev->stats.tx_dropped;
 308                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 309                 }
 310                 spin_unlock_irq(&priv->tx_lock);
 311
 312                 /* Clear the busy flag so we try again */
 313                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
 314                                             &mcast->flags);
 315         }
 316         return status;
 317 }
 318
 319 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 320 {
 321         struct net_device *dev = mcast->dev;
 322         struct ipoib_dev_priv *priv = netdev_priv(dev);
 323         struct ib_sa_mcmember_rec rec = {
 324 #if 0                           /* Some SMs don't support send-only yet */
 325                 .join_state = 4
 326 #else
 327                 .join_state = 1
 328 #endif
 329         };
 330         int ret = 0;
 331
 332         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 333                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 334                 return -ENODEV;
 335         }
 336
 337         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 338                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 339                 return -EBUSY;
 340         }
 341
 342         rec.mgid     = mcast->mcmember.mgid;
 343         rec.port_gid = priv->local_gid;
 344         rec.pkey     = cpu_to_be16(priv->pkey);
 345
 346         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 347                                          priv->port, &rec,
 348                                          IB_SA_MCMEMBER_REC_MGID        |
 349                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 350                                          IB_SA_MCMEMBER_REC_PKEY        |
 351                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 352                                          GFP_ATOMIC,
 353                                          ipoib_mcast_sendonly_join_complete,
 354                                          mcast);
 355         if (IS_ERR(mcast->mc)) {
 356                 ret = PTR_ERR(mcast->mc);
 357                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 358                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
 359                            ret);
 360         } else {
 361                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 362                                 ", starting join\n",
 363                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 364         }
 365
 366         return ret;
 367 }
 368
 369 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 370 {
 371         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 372                                                    carrier_on_task);
 373
 374         /*
 375          * Take rtnl_lock to avoid racing with ipoib_stop() and
 376          * turning the carrier back on while a device is being
 377          * removed.
 378          */
 379         rtnl_lock();
 380         netif_carrier_on(priv->dev);
 381         rtnl_unlock();
 382 }
 383
 384 static int ipoib_mcast_join_complete(int status,
 385                                      struct ib_sa_multicast *multicast)
 386 {
 387         struct ipoib_mcast *mcast = multicast->context;
 388         struct net_device *dev = mcast->dev;
 389         struct ipoib_dev_priv *priv = netdev_priv(dev);
 390
 391         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 392                         " (status %d)\n",
 393                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 394
 395         /* We trap for port events ourselves. */
 396         if (status == -ENETRESET)
 397                 return 0;
 398
 399         if (!status)
 400                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 401
 402         if (!status) {
 403                 mcast->backoff = 1;
 404                 mutex_lock(&mcast_mutex);
 405                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 406                         queue_delayed_work(ipoib_workqueue,
 407                                            &priv->mcast_task, 0);
 408                 mutex_unlock(&mcast_mutex);
 409
 410                 /*
 411                  * Defer carrier on work to ipoib_workqueue to avoid a
 412                  * deadlock on rtnl_lock here.
 413                  */
 414                 if (mcast == priv->broadcast)
 415                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
 416
 417                 return 0;
 418         }
 419
 420         if (mcast->logcount++ < 20) {
 421                 if (status == -ETIMEDOUT) {
 422                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 423                                         ", status %d\n",
 424                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 425                                         status);
 426                 } else {
 427                         ipoib_warn(priv, "multicast join failed for "
 428                                    IPOIB_GID_FMT ", status %d\n",
 429                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 430                                    status);
 431                 }
 432         }
 433
 434         mcast->backoff *= 2;
 435         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 436                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 437
 438         /* Clear the busy flag so we try again */
 439         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 440
 441         mutex_lock(&mcast_mutex);
 442         spin_lock_irq(&priv->lock);
 443         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 444                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 445                                    mcast->backoff * HZ);
 446         spin_unlock_irq(&priv->lock);
 447         mutex_unlock(&mcast_mutex);
 448
 449         return status;
 450 }
 451
 452 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 453                              int create)
 454 {
 455         struct ipoib_dev_priv *priv = netdev_priv(dev);
 456         struct ib_sa_mcmember_rec rec = {
 457                 .join_state = 1
 458         };
 459         ib_sa_comp_mask comp_mask;
 460         int ret = 0;
 461
 462         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 463                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 464
 465         rec.mgid     = mcast->mcmember.mgid;
 466         rec.port_gid = priv->local_gid;
 467         rec.pkey     = cpu_to_be16(priv->pkey);
 468
 469         comp_mask =
 470                 IB_SA_MCMEMBER_REC_MGID         |
 471                 IB_SA_MCMEMBER_REC_PORT_GID     |
 472                 IB_SA_MCMEMBER_REC_PKEY         |
 473                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 474
 475         if (create) {
 476                 comp_mask |=
 477                         IB_SA_MCMEMBER_REC_QKEY                 |
 478                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 479                         IB_SA_MCMEMBER_REC_MTU                  |
 480                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 481                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 482                         IB_SA_MCMEMBER_REC_RATE                 |
 483                         IB_SA_MCMEMBER_REC_SL                   |
 484                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 485                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 486
 487                 rec.qkey          = priv->broadcast->mcmember.qkey;
 488                 rec.mtu_selector  = IB_SA_EQ;
 489                 rec.mtu           = priv->broadcast->mcmember.mtu;
 490                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 491                 rec.rate_selector = IB_SA_EQ;
 492                 rec.rate          = priv->broadcast->mcmember.rate;
 493                 rec.sl            = priv->broadcast->mcmember.sl;
 494                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 495                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 496         }
 497
 498         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 499         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 500                                          &rec, comp_mask, GFP_KERNEL,
 501                                          ipoib_mcast_join_complete, mcast);
 502         if (IS_ERR(mcast->mc)) {
 503                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 504                 ret = PTR_ERR(mcast->mc);
 505                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 506
 507                 mcast->backoff *= 2;
 508                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 509                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 510
 511                 mutex_lock(&mcast_mutex);
 512                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 513                         queue_delayed_work(ipoib_workqueue,
 514                                            &priv->mcast_task,
 515                                            mcast->backoff * HZ);
 516                 mutex_unlock(&mcast_mutex);
 517         }
 518 }
 519
 520 void ipoib_mcast_join_task(struct work_struct *work)
 521 {
 522         struct ipoib_dev_priv *priv =
 523                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 524         struct net_device *dev = priv->dev;
 525
 526         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 527                 return;
 528
 529         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 530                 ipoib_warn(priv, "ib_query_gid() failed\n");
 531         else
 532                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 533
 534         {
 535                 struct ib_port_attr attr;
 536
 537                 if (!ib_query_port(priv->ca, priv->port, &attr))
 538                         priv->local_lid = attr.lid;
 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                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 568                         ipoib_mcast_join(dev, priv->broadcast, 0);
 569                 return;
 570         }
 571
 572         while (1) {
 573                 struct ipoib_mcast *mcast = NULL;
 574
 575                 spin_lock_irq(&priv->lock);
 576                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 577                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 578                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 579                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 580                                 /* Found the next unjoined group */
 581                                 break;
 582                         }
 583                 }
 584                 spin_unlock_irq(&priv->lock);
 585
 586                 if (&mcast->list == &priv->multicast_list) {
 587                         /* All done */
 588                         break;
 589                 }
 590
 591                 ipoib_mcast_join(dev, mcast, 1);
 592                 return;
 593         }
 594
 595         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 596
 597         if (!ipoib_cm_admin_enabled(dev)) {
 598                 rtnl_lock();
 599                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
 600                 rtnl_unlock();
 601         }
 602
 603         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 604
 605         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 606 }
 607
 608 int ipoib_mcast_start_thread(struct net_device *dev)
 609 {
 610         struct ipoib_dev_priv *priv = netdev_priv(dev);
 611
 612         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 613
 614         mutex_lock(&mcast_mutex);
 615         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 616                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 617         mutex_unlock(&mcast_mutex);
 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
 626         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 627
 628         mutex_lock(&mcast_mutex);
 629         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 630         cancel_delayed_work(&priv->mcast_task);
 631         mutex_unlock(&mcast_mutex);
 632
 633         if (flush)
 634                 flush_workqueue(ipoib_workqueue);
 635
 636         return 0;
 637 }
 638
 639 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 640 {
 641         struct ipoib_dev_priv *priv = netdev_priv(dev);
 642         int ret = 0;
 643
 644         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 645                 ib_sa_free_multicast(mcast->mc);
 646
 647         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 648                 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 649                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 650
 651                 /* Remove ourselves from the multicast group */
 652                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 653                                       be16_to_cpu(mcast->mcmember.mlid));
 654                 if (ret)
 655                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 656         }
 657
 658         return 0;
 659 }
 660
 661 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 662 {
 663         struct ipoib_dev_priv *priv = netdev_priv(dev);
 664         struct ipoib_mcast *mcast;
 665
 666         /*
 667          * We can only be called from ipoib_start_xmit, so we're
 668          * inside tx_lock -- no need to save/restore flags.
 669          */
 670         spin_lock(&priv->lock);
 671
 672         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 673             !priv->broadcast                                    ||
 674             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 675                 ++dev->stats.tx_dropped;
 676                 dev_kfree_skb_any(skb);
 677                 goto unlock;
 678         }
 679
 680         mcast = __ipoib_mcast_find(dev, mgid);
 681         if (!mcast) {
 682                 /* Let's create a new send only group now */
 683                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 684                                 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
 685
 686                 mcast = ipoib_mcast_alloc(dev, 0);
 687                 if (!mcast) {
 688                         ipoib_warn(priv, "unable to allocate memory for "
 689                                    "multicast structure\n");
 690                         ++dev->stats.tx_dropped;
 691                         dev_kfree_skb_any(skb);
 692                         goto out;
 693                 }
 694
 695                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 696                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 697                 __ipoib_mcast_add(dev, mcast);
 698                 list_add_tail(&mcast->list, &priv->multicast_list);
 699         }
 700
 701         if (!mcast->ah) {
 702                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 703                         skb_queue_tail(&mcast->pkt_queue, skb);
 704                 else {
 705                         ++dev->stats.tx_dropped;
 706                         dev_kfree_skb_any(skb);
 707                 }
 708
 709                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 710                         ipoib_dbg_mcast(priv, "no address vector, "
 711                                         "but multicast join already started\n");
 712                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 713                         ipoib_mcast_sendonly_join(mcast);
 714
 715                 /*
 716                  * If lookup completes between here and out:, don't
 717                  * want to send packet twice.
 718                  */
 719                 mcast = NULL;
 720         }
 721
 722 out:
 723         if (mcast && mcast->ah) {
 724                 if (skb->dst            &&
 725                     skb->dst->neighbour &&
 726                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 727                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
 728                                                                         skb->dev);
 729
 730                         if (neigh) {
 731                                 kref_get(&mcast->ah->ref);
 732                                 neigh->ah       = mcast->ah;
 733                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 734                         }
 735                 }
 736
 737                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 738         }
 739
 740 unlock:
 741         spin_unlock(&priv->lock);
 742 }
 743
 744 void ipoib_mcast_dev_flush(struct net_device *dev)
 745 {
 746         struct ipoib_dev_priv *priv = netdev_priv(dev);
 747         LIST_HEAD(remove_list);
 748         struct ipoib_mcast *mcast, *tmcast;
 749         unsigned long flags;
 750
 751         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 752
 753         spin_lock_irqsave(&priv->lock, flags);
 754
 755         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 756                 list_del(&mcast->list);
 757                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 758                 list_add_tail(&mcast->list, &remove_list);
 759         }
 760
 761         if (priv->broadcast) {
 762                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 763                 list_add_tail(&priv->broadcast->list, &remove_list);
 764                 priv->broadcast = NULL;
 765         }
 766
 767         spin_unlock_irqrestore(&priv->lock, flags);
 768
 769         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 770                 ipoib_mcast_leave(dev, mcast);
 771                 ipoib_mcast_free(mcast);
 772         }
 773 }
 774
 775 void ipoib_mcast_restart_task(struct work_struct *work)
 776 {
 777         struct ipoib_dev_priv *priv =
 778                 container_of(work, struct ipoib_dev_priv, restart_task);
 779         struct net_device *dev = priv->dev;
 780         struct dev_mc_list *mclist;
 781         struct ipoib_mcast *mcast, *tmcast;
 782         LIST_HEAD(remove_list);
 783         unsigned long flags;
 784         struct ib_sa_mcmember_rec rec;
 785
 786         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 787
 788         ipoib_mcast_stop_thread(dev, 0);
 789
 790         local_irq_save(flags);
 791         netif_addr_lock(dev);
 792         spin_lock(&priv->lock);
 793
 794         /*
 795          * Unfortunately, the networking core only gives us a list of all of
 796          * the multicast hardware addresses. We need to figure out which ones
 797          * are new and which ones have been removed
 798          */
 799
 800         /* Clear out the found flag */
 801         list_for_each_entry(mcast, &priv->multicast_list, list)
 802                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 803
 804         /* Mark all of the entries that are found or don't exist */
 805         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 806                 union ib_gid mgid;
 807
 808                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 809
 810                 mcast = __ipoib_mcast_find(dev, &mgid);
 811                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 812                         struct ipoib_mcast *nmcast;
 813
 814                         /* ignore group which is directly joined by userspace */
 815                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 816                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 817                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid "
 818                                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 819                                 continue;
 820                         }
 821
 822                         /* Not found or send-only group, let's add a new entry */
 823                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 824                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 825
 826                         nmcast = ipoib_mcast_alloc(dev, 0);
 827                         if (!nmcast) {
 828                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 829                                 continue;
 830                         }
 831
 832                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 833
 834                         nmcast->mcmember.mgid = mgid;
 835
 836                         if (mcast) {
 837                                 /* Destroy the send only entry */
 838                                 list_move_tail(&mcast->list, &remove_list);
 839
 840                                 rb_replace_node(&mcast->rb_node,
 841                                                 &nmcast->rb_node,
 842                                                 &priv->multicast_tree);
 843                         } else
 844                                 __ipoib_mcast_add(dev, nmcast);
 845
 846                         list_add_tail(&nmcast->list, &priv->multicast_list);
 847                 }
 848
 849                 if (mcast)
 850                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 851         }
 852
 853         /* Remove all of the entries don't exist anymore */
 854         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 855                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 856                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 857                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 858                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 859
 860                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 861
 862                         /* Move to the remove list */
 863                         list_move_tail(&mcast->list, &remove_list);
 864                 }
 865         }
 866
 867         spin_unlock(&priv->lock);
 868         netif_addr_unlock(dev);
 869         local_irq_restore(flags);
 870
 871         /* We have to cancel outside of the spinlock */
 872         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 873                 ipoib_mcast_leave(mcast->dev, mcast);
 874                 ipoib_mcast_free(mcast);
 875         }
 876
 877         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 878                 ipoib_mcast_start_thread(dev);
 879 }
 880
 881 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 882
 883 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 884 {
 885         struct ipoib_mcast_iter *iter;
 886
 887         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 888         if (!iter)
 889                 return NULL;
 890
 891         iter->dev = dev;
 892         memset(iter->mgid.raw, 0, 16);
 893
 894         if (ipoib_mcast_iter_next(iter)) {
 895                 kfree(iter);
 896                 return NULL;
 897         }
 898
 899         return iter;
 900 }
 901
 902 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 903 {
 904         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 905         struct rb_node *n;
 906         struct ipoib_mcast *mcast;
 907         int ret = 1;
 908
 909         spin_lock_irq(&priv->lock);
 910
 911         n = rb_first(&priv->multicast_tree);
 912
 913         while (n) {
 914                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 915
 916                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 917                            sizeof (union ib_gid)) < 0) {
 918                         iter->mgid      = mcast->mcmember.mgid;
 919                         iter->created   = mcast->created;
 920                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 921                         iter->complete  = !!mcast->ah;
 922                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 923
 924                         ret = 0;
 925
 926                         break;
 927                 }
 928
 929                 n = rb_next(n);
 930         }
 931
 932         spin_unlock_irq(&priv->lock);
 933
 934         return ret;
 935 }
 936
 937 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 938                            union ib_gid *mgid,
 939                            unsigned long *created,
 940                            unsigned int *queuelen,
 941                            unsigned int *complete,
 942                            unsigned int *send_only)
 943 {
 944         *mgid      = iter->mgid;
 945         *created   = iter->created;
 946         *queuelen  = iter->queuelen;
 947         *complete  = iter->complete;
 948         *send_only = iter->send_only;
 949 }
 950
 951 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */