git.oblomov.eu Git - linux-2.6/blob - 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  * $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 ib_sa_multicast   *mc;
  64         struct ipoib_ah          *ah;
  65
  66         struct rb_node    rb_node;
  67         struct list_head  list;
  68
  69         unsigned long created;
  70         unsigned long backoff;
  71
  72         unsigned long flags;
  73         unsigned char logcount;
  74
  75         struct list_head  neigh_list;
  76
  77         struct sk_buff_head pkt_queue;
  78
  79         struct net_device *dev;
  80 };
  81
  82 struct ipoib_mcast_iter {
  83         struct net_device *dev;
  84         union ib_gid       mgid;
  85         unsigned long      created;
  86         unsigned int       queuelen;
  87         unsigned int       complete;
  88         unsigned int       send_only;
  89 };
  90
  91 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  92 {
  93         struct net_device *dev = mcast->dev;
  94         struct ipoib_dev_priv *priv = netdev_priv(dev);
  95         struct ipoib_neigh *neigh, *tmp;
  96         unsigned long flags;
  97         int tx_dropped = 0;
  98
  99         ipoib_dbg_mcast(netdev_priv(dev),
 100                         "deleting multicast group " IPOIB_GID_FMT "\n",
 101                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 102
 103         spin_lock_irqsave(&priv->lock, flags);
 104
 105         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
 106                 /*
 107                  * It's safe to call ipoib_put_ah() inside priv->lock
 108                  * here, because we know that mcast->ah will always
 109                  * hold one more reference, so ipoib_put_ah() will
 110                  * never do more than decrement the ref count.
 111                  */
 112                 if (neigh->ah)
 113                         ipoib_put_ah(neigh->ah);
 114                 ipoib_neigh_free(dev, neigh);
 115         }
 116
 117         spin_unlock_irqrestore(&priv->lock, flags);
 118
 119         if (mcast->ah)
 120                 ipoib_put_ah(mcast->ah);
 121
 122         while (!skb_queue_empty(&mcast->pkt_queue)) {
 123                 ++tx_dropped;
 124                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 125         }
 126
 127         spin_lock_irqsave(&priv->tx_lock, flags);
 128         priv->stats.tx_dropped += tx_dropped;
 129         spin_unlock_irqrestore(&priv->tx_lock, flags);
 130
 131         kfree(mcast);
 132 }
 133
 134 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 135                                              int can_sleep)
 136 {
 137         struct ipoib_mcast *mcast;
 138
 139         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 140         if (!mcast)
 141                 return NULL;
 142
 143         mcast->dev = dev;
 144         mcast->created = jiffies;
 145         mcast->backoff = 1;
 146
 147         INIT_LIST_HEAD(&mcast->list);
 148         INIT_LIST_HEAD(&mcast->neigh_list);
 149         skb_queue_head_init(&mcast->pkt_queue);
 150
 151         return mcast;
 152 }
 153
 154 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 155 {
 156         struct ipoib_dev_priv *priv = netdev_priv(dev);
 157         struct rb_node *n = priv->multicast_tree.rb_node;
 158
 159         while (n) {
 160                 struct ipoib_mcast *mcast;
 161                 int ret;
 162
 163                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 164
 165                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 166                              sizeof (union ib_gid));
 167                 if (ret < 0)
 168                         n = n->rb_left;
 169                 else if (ret > 0)
 170                         n = n->rb_right;
 171                 else
 172                         return mcast;
 173         }
 174
 175         return NULL;
 176 }
 177
 178 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 179 {
 180         struct ipoib_dev_priv *priv = netdev_priv(dev);
 181         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 182
 183         while (*n) {
 184                 struct ipoib_mcast *tmcast;
 185                 int ret;
 186
 187                 pn = *n;
 188                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 189
 190                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 191                              sizeof (union ib_gid));
 192                 if (ret < 0)
 193                         n = &pn->rb_left;
 194                 else if (ret > 0)
 195                         n = &pn->rb_right;
 196                 else
 197                         return -EEXIST;
 198         }
 199
 200         rb_link_node(&mcast->rb_node, pn, n);
 201         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 202
 203         return 0;
 204 }
 205
 206 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 207                                    struct ib_sa_mcmember_rec *mcmember)
 208 {
 209         struct net_device *dev = mcast->dev;
 210         struct ipoib_dev_priv *priv = netdev_priv(dev);
 211         struct ipoib_ah *ah;
 212         int ret;
 213
 214         mcast->mcmember = *mcmember;
 215
 216         /* Set the cached Q_Key before we attach if it's the broadcast group */
 217         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 218                     sizeof (union ib_gid))) {
 219                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 220                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 221         }
 222
 223         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 224                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 225                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 226                                    " already attached\n",
 227                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 228
 229                         return 0;
 230                 }
 231
 232                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 233                                          &mcast->mcmember.mgid);
 234                 if (ret < 0) {
 235                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 236                                    IPOIB_GID_FMT "\n",
 237                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 238
 239                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 240                         return ret;
 241                 }
 242         }
 243
 244         {
 245                 struct ib_ah_attr av = {
 246                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 247                         .port_num      = priv->port,
 248                         .sl            = mcast->mcmember.sl,
 249                         .ah_flags      = IB_AH_GRH,
 250                         .static_rate   = mcast->mcmember.rate,
 251                         .grh           = {
 252                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 253                                 .hop_limit     = mcast->mcmember.hop_limit,
 254                                 .sgid_index    = 0,
 255                                 .traffic_class = mcast->mcmember.traffic_class
 256                         }
 257                 };
 258                 av.grh.dgid = mcast->mcmember.mgid;
 259
 260                 ah = ipoib_create_ah(dev, priv->pd, &av);
 261                 if (!ah) {
 262                         ipoib_warn(priv, "ib_address_create failed\n");
 263                 } else {
 264                         spin_lock_irq(&priv->lock);
 265                         mcast->ah = ah;
 266                         spin_unlock_irq(&priv->lock);
 267
 268                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 269                                         " AV %p, LID 0x%04x, SL %d\n",
 270                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 271                                         mcast->ah->ah,
 272                                         be16_to_cpu(mcast->mcmember.mlid),
 273                                         mcast->mcmember.sl);
 274                 }
 275         }
 276
 277         /* actually send any queued packets */
 278         spin_lock_irq(&priv->tx_lock);
 279         while (!skb_queue_empty(&mcast->pkt_queue)) {
 280                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 281                 spin_unlock_irq(&priv->tx_lock);
 282
 283                 skb->dev = dev;
 284
 285                 if (!skb->dst || !skb->dst->neighbour) {
 286                         /* put pseudoheader back on for next time */
 287                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 288                 }
 289
 290                 if (dev_queue_xmit(skb))
 291                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 292                 spin_lock_irq(&priv->tx_lock);
 293         }
 294         spin_unlock_irq(&priv->tx_lock);
 295
 296         return 0;
 297 }
 298
 299 static int
 300 ipoib_mcast_sendonly_join_complete(int status,
 301                                    struct ib_sa_multicast *multicast)
 302 {
 303         struct ipoib_mcast *mcast = multicast->context;
 304         struct net_device *dev = mcast->dev;
 305         struct ipoib_dev_priv *priv = netdev_priv(dev);
 306
 307         /* We trap for port events ourselves. */
 308         if (status == -ENETRESET)
 309                 return 0;
 310
 311         if (!status)
 312                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 313
 314         if (status) {
 315                 if (mcast->logcount++ < 20)
 316                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 317                                         IPOIB_GID_FMT ", status %d\n",
 318                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 319
 320                 /* Flush out any queued packets */
 321                 spin_lock_irq(&priv->tx_lock);
 322                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 323                         ++priv->stats.tx_dropped;
 324                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 325                 }
 326                 spin_unlock_irq(&priv->tx_lock);
 327
 328                 /* Clear the busy flag so we try again */
 329                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
 330                                             &mcast->flags);
 331         }
 332         return status;
 333 }
 334
 335 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 336 {
 337         struct net_device *dev = mcast->dev;
 338         struct ipoib_dev_priv *priv = netdev_priv(dev);
 339         struct ib_sa_mcmember_rec rec = {
 340 #if 0                           /* Some SMs don't support send-only yet */
 341                 .join_state = 4
 342 #else
 343                 .join_state = 1
 344 #endif
 345         };
 346         int ret = 0;
 347
 348         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 349                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 350                 return -ENODEV;
 351         }
 352
 353         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 354                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 355                 return -EBUSY;
 356         }
 357
 358         rec.mgid     = mcast->mcmember.mgid;
 359         rec.port_gid = priv->local_gid;
 360         rec.pkey     = cpu_to_be16(priv->pkey);
 361
 362         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 363                                          priv->port, &rec,
 364                                          IB_SA_MCMEMBER_REC_MGID        |
 365                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 366                                          IB_SA_MCMEMBER_REC_PKEY        |
 367                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 368                                          GFP_ATOMIC,
 369                                          ipoib_mcast_sendonly_join_complete,
 370                                          mcast);
 371         if (IS_ERR(mcast->mc)) {
 372                 ret = PTR_ERR(mcast->mc);
 373                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 374                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
 375                            ret);
 376         } else {
 377                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 378                                 ", starting join\n",
 379                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 380         }
 381
 382         return ret;
 383 }
 384
 385 static int ipoib_mcast_join_complete(int status,
 386                                      struct ib_sa_multicast *multicast)
 387 {
 388         struct ipoib_mcast *mcast = multicast->context;
 389         struct net_device *dev = mcast->dev;
 390         struct ipoib_dev_priv *priv = netdev_priv(dev);
 391
 392         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 393                         " (status %d)\n",
 394                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 395
 396         /* We trap for port events ourselves. */
 397         if (status == -ENETRESET)
 398                 return 0;
 399
 400         if (!status)
 401                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 402
 403         if (!status) {
 404                 mcast->backoff = 1;
 405                 mutex_lock(&mcast_mutex);
 406                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 407                         queue_delayed_work(ipoib_workqueue,
 408                                            &priv->mcast_task, 0);
 409                 mutex_unlock(&mcast_mutex);
 410
 411                 if (mcast == priv->broadcast)
 412                         netif_carrier_on(dev);
 413
 414                 return 0;
 415         }
 416
 417         if (mcast->logcount++ < 20) {
 418                 if (status == -ETIMEDOUT) {
 419                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 420                                         ", status %d\n",
 421                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 422                                         status);
 423                 } else {
 424                         ipoib_warn(priv, "multicast join failed for "
 425                                    IPOIB_GID_FMT ", status %d\n",
 426                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 427                                    status);
 428                 }
 429         }
 430
 431         mcast->backoff *= 2;
 432         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 433                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 434
 435         /* Clear the busy flag so we try again */
 436         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 437
 438         mutex_lock(&mcast_mutex);
 439         spin_lock_irq(&priv->lock);
 440         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 441                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 442                                    mcast->backoff * HZ);
 443         spin_unlock_irq(&priv->lock);
 444         mutex_unlock(&mcast_mutex);
 445
 446         return status;
 447 }
 448
 449 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 450                              int create)
 451 {
 452         struct ipoib_dev_priv *priv = netdev_priv(dev);
 453         struct ib_sa_mcmember_rec rec = {
 454                 .join_state = 1
 455         };
 456         ib_sa_comp_mask comp_mask;
 457         int ret = 0;
 458
 459         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 460                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 461
 462         rec.mgid     = mcast->mcmember.mgid;
 463         rec.port_gid = priv->local_gid;
 464         rec.pkey     = cpu_to_be16(priv->pkey);
 465
 466         comp_mask =
 467                 IB_SA_MCMEMBER_REC_MGID         |
 468                 IB_SA_MCMEMBER_REC_PORT_GID     |
 469                 IB_SA_MCMEMBER_REC_PKEY         |
 470                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 471
 472         if (create) {
 473                 comp_mask |=
 474                         IB_SA_MCMEMBER_REC_QKEY                 |
 475                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 476                         IB_SA_MCMEMBER_REC_MTU                  |
 477                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 478                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 479                         IB_SA_MCMEMBER_REC_RATE                 |
 480                         IB_SA_MCMEMBER_REC_SL                   |
 481                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 482                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 483
 484                 rec.qkey          = priv->broadcast->mcmember.qkey;
 485                 rec.mtu_selector  = IB_SA_EQ;
 486                 rec.mtu           = priv->broadcast->mcmember.mtu;
 487                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 488                 rec.rate_selector = IB_SA_EQ;
 489                 rec.rate          = priv->broadcast->mcmember.rate;
 490                 rec.sl            = priv->broadcast->mcmember.sl;
 491                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 492                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 493         }
 494
 495         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 496         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 497                                          &rec, comp_mask, GFP_KERNEL,
 498                                          ipoib_mcast_join_complete, mcast);
 499         if (IS_ERR(mcast->mc)) {
 500                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 501                 ret = PTR_ERR(mcast->mc);
 502                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 503
 504                 mcast->backoff *= 2;
 505                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 506                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 507
 508                 mutex_lock(&mcast_mutex);
 509                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 510                         queue_delayed_work(ipoib_workqueue,
 511                                            &priv->mcast_task,
 512                                            mcast->backoff * HZ);
 513                 mutex_unlock(&mcast_mutex);
 514         }
 515 }
 516
 517 void ipoib_mcast_join_task(struct work_struct *work)
 518 {
 519         struct ipoib_dev_priv *priv =
 520                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 521         struct net_device *dev = priv->dev;
 522
 523         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 524                 return;
 525
 526         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 527                 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
 528         else
 529                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 530
 531         {
 532                 struct ib_port_attr attr;
 533
 534                 if (!ib_query_port(priv->ca, priv->port, &attr))
 535                         priv->local_lid = attr.lid;
 536                 else
 537                         ipoib_warn(priv, "ib_query_port failed\n");
 538         }
 539
 540         if (!priv->broadcast) {
 541                 struct ipoib_mcast *broadcast;
 542
 543                 broadcast = ipoib_mcast_alloc(dev, 1);
 544                 if (!broadcast) {
 545                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 546                         mutex_lock(&mcast_mutex);
 547                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 548                                 queue_delayed_work(ipoib_workqueue,
 549                                                    &priv->mcast_task, HZ);
 550                         mutex_unlock(&mcast_mutex);
 551                         return;
 552                 }
 553
 554                 spin_lock_irq(&priv->lock);
 555                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 556                        sizeof (union ib_gid));
 557                 priv->broadcast = broadcast;
 558
 559                 __ipoib_mcast_add(dev, priv->broadcast);
 560                 spin_unlock_irq(&priv->lock);
 561         }
 562
 563         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 564                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 565                         ipoib_mcast_join(dev, priv->broadcast, 0);
 566                 return;
 567         }
 568
 569         while (1) {
 570                 struct ipoib_mcast *mcast = NULL;
 571
 572                 spin_lock_irq(&priv->lock);
 573                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 574                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 575                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 576                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 577                                 /* Found the next unjoined group */
 578                                 break;
 579                         }
 580                 }
 581                 spin_unlock_irq(&priv->lock);
 582
 583                 if (&mcast->list == &priv->multicast_list) {
 584                         /* All done */
 585                         break;
 586                 }
 587
 588                 ipoib_mcast_join(dev, mcast, 1);
 589                 return;
 590         }
 591
 592         priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
 593                 IPOIB_ENCAP_LEN;
 594
 595         if (!ipoib_cm_admin_enabled(dev))
 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 }
 602
 603 int ipoib_mcast_start_thread(struct net_device *dev)
 604 {
 605         struct ipoib_dev_priv *priv = netdev_priv(dev);
 606
 607         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 608
 609         mutex_lock(&mcast_mutex);
 610         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 611                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 612         mutex_unlock(&mcast_mutex);
 613
 614         spin_lock_irq(&priv->lock);
 615         set_bit(IPOIB_MCAST_STARTED, &priv->flags);
 616         spin_unlock_irq(&priv->lock);
 617
 618         return 0;
 619 }
 620
 621 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 622 {
 623         struct ipoib_dev_priv *priv = netdev_priv(dev);
 624
 625         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 626
 627         spin_lock_irq(&priv->lock);
 628         clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
 629         spin_unlock_irq(&priv->lock);
 630
 631         mutex_lock(&mcast_mutex);
 632         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 633         cancel_delayed_work(&priv->mcast_task);
 634         mutex_unlock(&mcast_mutex);
 635
 636         if (flush)
 637                 flush_workqueue(ipoib_workqueue);
 638
 639         return 0;
 640 }
 641
 642 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 643 {
 644         struct ipoib_dev_priv *priv = netdev_priv(dev);
 645         int ret = 0;
 646
 647         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 648                 ib_sa_free_multicast(mcast->mc);
 649
 650         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 651                 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 652                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 653
 654                 /* Remove ourselves from the multicast group */
 655                 ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
 656                                          &mcast->mcmember.mgid);
 657                 if (ret)
 658                         ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
 659         }
 660
 661         return 0;
 662 }
 663
 664 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 665 {
 666         struct ipoib_dev_priv *priv = netdev_priv(dev);
 667         struct ipoib_mcast *mcast;
 668
 669         /*
 670          * We can only be called from ipoib_start_xmit, so we're
 671          * inside tx_lock -- no need to save/restore flags.
 672          */
 673         spin_lock(&priv->lock);
 674
 675         if (!test_bit(IPOIB_MCAST_STARTED, &priv->flags)        ||
 676             !priv->broadcast                                    ||
 677             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 678                 ++priv->stats.tx_dropped;
 679                 dev_kfree_skb_any(skb);
 680                 goto unlock;
 681         }
 682
 683         mcast = __ipoib_mcast_find(dev, mgid);
 684         if (!mcast) {
 685                 /* Let's create a new send only group now */
 686                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 687                                 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
 688
 689                 mcast = ipoib_mcast_alloc(dev, 0);
 690                 if (!mcast) {
 691                         ipoib_warn(priv, "unable to allocate memory for "
 692                                    "multicast structure\n");
 693                         ++priv->stats.tx_dropped;
 694                         dev_kfree_skb_any(skb);
 695                         goto out;
 696                 }
 697
 698                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 699                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 700                 __ipoib_mcast_add(dev, mcast);
 701                 list_add_tail(&mcast->list, &priv->multicast_list);
 702         }
 703
 704         if (!mcast->ah) {
 705                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 706                         skb_queue_tail(&mcast->pkt_queue, skb);
 707                 else {
 708                         ++priv->stats.tx_dropped;
 709                         dev_kfree_skb_any(skb);
 710                 }
 711
 712                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 713                         ipoib_dbg_mcast(priv, "no address vector, "
 714                                         "but multicast join already started\n");
 715                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 716                         ipoib_mcast_sendonly_join(mcast);
 717
 718                 /*
 719                  * If lookup completes between here and out:, don't
 720                  * want to send packet twice.
 721                  */
 722                 mcast = NULL;
 723         }
 724
 725 out:
 726         if (mcast && mcast->ah) {
 727                 if (skb->dst            &&
 728                     skb->dst->neighbour &&
 729                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 730                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour);
 731
 732                         if (neigh) {
 733                                 kref_get(&mcast->ah->ref);
 734                                 neigh->ah       = mcast->ah;
 735                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 736                         }
 737                 }
 738
 739                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 740         }
 741
 742 unlock:
 743         spin_unlock(&priv->lock);
 744 }
 745
 746 void ipoib_mcast_dev_flush(struct net_device *dev)
 747 {
 748         struct ipoib_dev_priv *priv = netdev_priv(dev);
 749         LIST_HEAD(remove_list);
 750         struct ipoib_mcast *mcast, *tmcast;
 751         unsigned long flags;
 752
 753         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 754
 755         spin_lock_irqsave(&priv->lock, flags);
 756
 757         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 758                 list_del(&mcast->list);
 759                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 760                 list_add_tail(&mcast->list, &remove_list);
 761         }
 762
 763         if (priv->broadcast) {
 764                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 765                 list_add_tail(&priv->broadcast->list, &remove_list);
 766                 priv->broadcast = NULL;
 767         }
 768
 769         spin_unlock_irqrestore(&priv->lock, flags);
 770
 771         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 772                 ipoib_mcast_leave(dev, mcast);
 773                 ipoib_mcast_free(mcast);
 774         }
 775 }
 776
 777 void ipoib_mcast_restart_task(struct work_struct *work)
 778 {
 779         struct ipoib_dev_priv *priv =
 780                 container_of(work, struct ipoib_dev_priv, restart_task);
 781         struct net_device *dev = priv->dev;
 782         struct dev_mc_list *mclist;
 783         struct ipoib_mcast *mcast, *tmcast;
 784         LIST_HEAD(remove_list);
 785         unsigned long flags;
 786
 787         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 788
 789         ipoib_mcast_stop_thread(dev, 0);
 790
 791         local_irq_save(flags);
 792         netif_tx_lock(dev);
 793         spin_lock(&priv->lock);
 794
 795         /*
 796          * Unfortunately, the networking core only gives us a list of all of
 797          * the multicast hardware addresses. We need to figure out which ones
 798          * are new and which ones have been removed
 799          */
 800
 801         /* Clear out the found flag */
 802         list_for_each_entry(mcast, &priv->multicast_list, list)
 803                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 804
 805         /* Mark all of the entries that are found or don't exist */
 806         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 807                 union ib_gid mgid;
 808
 809                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 810
 811                 /* Add in the P_Key */
 812                 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
 813                 mgid.raw[5] = priv->pkey & 0xff;
 814
 815                 mcast = __ipoib_mcast_find(dev, &mgid);
 816                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 817                         struct ipoib_mcast *nmcast;
 818
 819                         /* Not found or send-only group, let's add a new entry */
 820                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 821                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 822
 823                         nmcast = ipoib_mcast_alloc(dev, 0);
 824                         if (!nmcast) {
 825                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 826                                 continue;
 827                         }
 828
 829                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 830
 831                         nmcast->mcmember.mgid = mgid;
 832
 833                         if (mcast) {
 834                                 /* Destroy the send only entry */
 835                                 list_move_tail(&mcast->list, &remove_list);
 836
 837                                 rb_replace_node(&mcast->rb_node,
 838                                                 &nmcast->rb_node,
 839                                                 &priv->multicast_tree);
 840                         } else
 841                                 __ipoib_mcast_add(dev, nmcast);
 842
 843                         list_add_tail(&nmcast->list, &priv->multicast_list);
 844                 }
 845
 846                 if (mcast)
 847                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 848         }
 849
 850         /* Remove all of the entries don't exist anymore */
 851         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 852                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 853                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 854                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 855                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 856
 857                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 858
 859                         /* Move to the remove list */
 860                         list_move_tail(&mcast->list, &remove_list);
 861                 }
 862         }
 863
 864         spin_unlock(&priv->lock);
 865         netif_tx_unlock(dev);
 866         local_irq_restore(flags);
 867
 868         /* We have to cancel outside of the spinlock */
 869         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 870                 ipoib_mcast_leave(mcast->dev, mcast);
 871                 ipoib_mcast_free(mcast);
 872         }
 873
 874         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 875                 ipoib_mcast_start_thread(dev);
 876 }
 877
 878 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 879
 880 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 881 {
 882         struct ipoib_mcast_iter *iter;
 883
 884         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 885         if (!iter)
 886                 return NULL;
 887
 888         iter->dev = dev;
 889         memset(iter->mgid.raw, 0, 16);
 890
 891         if (ipoib_mcast_iter_next(iter)) {
 892                 kfree(iter);
 893                 return NULL;
 894         }
 895
 896         return iter;
 897 }
 898
 899 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 900 {
 901         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 902         struct rb_node *n;
 903         struct ipoib_mcast *mcast;
 904         int ret = 1;
 905
 906         spin_lock_irq(&priv->lock);
 907
 908         n = rb_first(&priv->multicast_tree);
 909
 910         while (n) {
 911                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 912
 913                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 914                            sizeof (union ib_gid)) < 0) {
 915                         iter->mgid      = mcast->mcmember.mgid;
 916                         iter->created   = mcast->created;
 917                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 918                         iter->complete  = !!mcast->ah;
 919                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 920
 921                         ret = 0;
 922
 923                         break;
 924                 }
 925
 926                 n = rb_next(n);
 927         }
 928
 929         spin_unlock_irq(&priv->lock);
 930
 931         return ret;
 932 }
 933
 934 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 935                            union ib_gid *mgid,
 936                            unsigned long *created,
 937                            unsigned int *queuelen,
 938                            unsigned int *complete,
 939                            unsigned int *send_only)
 940 {
 941         *mgid      = iter->mgid;
 942         *created   = iter->created;
 943         *queuelen  = iter->queuelen;
 944         *complete  = iter->complete;
 945         *send_only = iter->send_only;
 946 }
 947
 948 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */