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 static int ipoib_mcast_join_complete(int status,
 370                                      struct ib_sa_multicast *multicast)
 371 {
 372         struct ipoib_mcast *mcast = multicast->context;
 373         struct net_device *dev = mcast->dev;
 374         struct ipoib_dev_priv *priv = netdev_priv(dev);
 375
 376         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 377                         " (status %d)\n",
 378                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 379
 380         /* We trap for port events ourselves. */
 381         if (status == -ENETRESET)
 382                 return 0;
 383
 384         if (!status)
 385                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 386
 387         if (!status) {
 388                 mcast->backoff = 1;
 389                 mutex_lock(&mcast_mutex);
 390                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 391                         queue_delayed_work(ipoib_workqueue,
 392                                            &priv->mcast_task, 0);
 393                 mutex_unlock(&mcast_mutex);
 394
 395                 if (mcast == priv->broadcast) {
 396                         /*
 397                          * Take RTNL lock here to avoid racing with
 398                          * ipoib_stop() and turning the carrier back
 399                          * on while a device is being removed.
 400                          */
 401                         rtnl_lock();
 402                         netif_carrier_on(dev);
 403                         rtnl_unlock();
 404                 }
 405
 406                 return 0;
 407         }
 408
 409         if (mcast->logcount++ < 20) {
 410                 if (status == -ETIMEDOUT) {
 411                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 412                                         ", status %d\n",
 413                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 414                                         status);
 415                 } else {
 416                         ipoib_warn(priv, "multicast join failed for "
 417                                    IPOIB_GID_FMT ", status %d\n",
 418                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 419                                    status);
 420                 }
 421         }
 422
 423         mcast->backoff *= 2;
 424         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 425                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 426
 427         /* Clear the busy flag so we try again */
 428         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 429
 430         mutex_lock(&mcast_mutex);
 431         spin_lock_irq(&priv->lock);
 432         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 433                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 434                                    mcast->backoff * HZ);
 435         spin_unlock_irq(&priv->lock);
 436         mutex_unlock(&mcast_mutex);
 437
 438         return status;
 439 }
 440
 441 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 442                              int create)
 443 {
 444         struct ipoib_dev_priv *priv = netdev_priv(dev);
 445         struct ib_sa_mcmember_rec rec = {
 446                 .join_state = 1
 447         };
 448         ib_sa_comp_mask comp_mask;
 449         int ret = 0;
 450
 451         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 452                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 453
 454         rec.mgid     = mcast->mcmember.mgid;
 455         rec.port_gid = priv->local_gid;
 456         rec.pkey     = cpu_to_be16(priv->pkey);
 457
 458         comp_mask =
 459                 IB_SA_MCMEMBER_REC_MGID         |
 460                 IB_SA_MCMEMBER_REC_PORT_GID     |
 461                 IB_SA_MCMEMBER_REC_PKEY         |
 462                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 463
 464         if (create) {
 465                 comp_mask |=
 466                         IB_SA_MCMEMBER_REC_QKEY                 |
 467                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 468                         IB_SA_MCMEMBER_REC_MTU                  |
 469                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 470                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 471                         IB_SA_MCMEMBER_REC_RATE                 |
 472                         IB_SA_MCMEMBER_REC_SL                   |
 473                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 474                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 475
 476                 rec.qkey          = priv->broadcast->mcmember.qkey;
 477                 rec.mtu_selector  = IB_SA_EQ;
 478                 rec.mtu           = priv->broadcast->mcmember.mtu;
 479                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 480                 rec.rate_selector = IB_SA_EQ;
 481                 rec.rate          = priv->broadcast->mcmember.rate;
 482                 rec.sl            = priv->broadcast->mcmember.sl;
 483                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 484                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 485         }
 486
 487         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 488         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 489                                          &rec, comp_mask, GFP_KERNEL,
 490                                          ipoib_mcast_join_complete, mcast);
 491         if (IS_ERR(mcast->mc)) {
 492                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 493                 ret = PTR_ERR(mcast->mc);
 494                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 495
 496                 mcast->backoff *= 2;
 497                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 498                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 499
 500                 mutex_lock(&mcast_mutex);
 501                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 502                         queue_delayed_work(ipoib_workqueue,
 503                                            &priv->mcast_task,
 504                                            mcast->backoff * HZ);
 505                 mutex_unlock(&mcast_mutex);
 506         }
 507 }
 508
 509 void ipoib_mcast_join_task(struct work_struct *work)
 510 {
 511         struct ipoib_dev_priv *priv =
 512                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 513         struct net_device *dev = priv->dev;
 514
 515         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 516                 return;
 517
 518         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 519                 ipoib_warn(priv, "ib_query_gid() failed\n");
 520         else
 521                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 522
 523         {
 524                 struct ib_port_attr attr;
 525
 526                 if (!ib_query_port(priv->ca, priv->port, &attr))
 527                         priv->local_lid = attr.lid;
 528                 else
 529                         ipoib_warn(priv, "ib_query_port failed\n");
 530         }
 531
 532         if (!priv->broadcast) {
 533                 struct ipoib_mcast *broadcast;
 534
 535                 broadcast = ipoib_mcast_alloc(dev, 1);
 536                 if (!broadcast) {
 537                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 538                         mutex_lock(&mcast_mutex);
 539                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 540                                 queue_delayed_work(ipoib_workqueue,
 541                                                    &priv->mcast_task, HZ);
 542                         mutex_unlock(&mcast_mutex);
 543                         return;
 544                 }
 545
 546                 spin_lock_irq(&priv->lock);
 547                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 548                        sizeof (union ib_gid));
 549                 priv->broadcast = broadcast;
 550
 551                 __ipoib_mcast_add(dev, priv->broadcast);
 552                 spin_unlock_irq(&priv->lock);
 553         }
 554
 555         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 556                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 557                         ipoib_mcast_join(dev, priv->broadcast, 0);
 558                 return;
 559         }
 560
 561         while (1) {
 562                 struct ipoib_mcast *mcast = NULL;
 563
 564                 spin_lock_irq(&priv->lock);
 565                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 566                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 567                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 568                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 569                                 /* Found the next unjoined group */
 570                                 break;
 571                         }
 572                 }
 573                 spin_unlock_irq(&priv->lock);
 574
 575                 if (&mcast->list == &priv->multicast_list) {
 576                         /* All done */
 577                         break;
 578                 }
 579
 580                 ipoib_mcast_join(dev, mcast, 1);
 581                 return;
 582         }
 583
 584         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 585
 586         if (!ipoib_cm_admin_enabled(dev)) {
 587                 rtnl_lock();
 588                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
 589                 rtnl_unlock();
 590         }
 591
 592         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 593
 594         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 595 }
 596
 597 int ipoib_mcast_start_thread(struct net_device *dev)
 598 {
 599         struct ipoib_dev_priv *priv = netdev_priv(dev);
 600
 601         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 602
 603         mutex_lock(&mcast_mutex);
 604         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 605                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 606         mutex_unlock(&mcast_mutex);
 607
 608         return 0;
 609 }
 610
 611 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 612 {
 613         struct ipoib_dev_priv *priv = netdev_priv(dev);
 614
 615         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 616
 617         mutex_lock(&mcast_mutex);
 618         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 619         cancel_delayed_work(&priv->mcast_task);
 620         mutex_unlock(&mcast_mutex);
 621
 622         if (flush)
 623                 flush_workqueue(ipoib_workqueue);
 624
 625         return 0;
 626 }
 627
 628 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 629 {
 630         struct ipoib_dev_priv *priv = netdev_priv(dev);
 631         int ret = 0;
 632
 633         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 634                 ib_sa_free_multicast(mcast->mc);
 635
 636         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 637                 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 638                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 639
 640                 /* Remove ourselves from the multicast group */
 641                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 642                                       be16_to_cpu(mcast->mcmember.mlid));
 643                 if (ret)
 644                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 645         }
 646
 647         return 0;
 648 }
 649
 650 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 651 {
 652         struct ipoib_dev_priv *priv = netdev_priv(dev);
 653         struct ipoib_mcast *mcast;
 654
 655         /*
 656          * We can only be called from ipoib_start_xmit, so we're
 657          * inside tx_lock -- no need to save/restore flags.
 658          */
 659         spin_lock(&priv->lock);
 660
 661         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 662             !priv->broadcast                                    ||
 663             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 664                 ++dev->stats.tx_dropped;
 665                 dev_kfree_skb_any(skb);
 666                 goto unlock;
 667         }
 668
 669         mcast = __ipoib_mcast_find(dev, mgid);
 670         if (!mcast) {
 671                 /* Let's create a new send only group now */
 672                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 673                                 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
 674
 675                 mcast = ipoib_mcast_alloc(dev, 0);
 676                 if (!mcast) {
 677                         ipoib_warn(priv, "unable to allocate memory for "
 678                                    "multicast structure\n");
 679                         ++dev->stats.tx_dropped;
 680                         dev_kfree_skb_any(skb);
 681                         goto out;
 682                 }
 683
 684                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 685                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 686                 __ipoib_mcast_add(dev, mcast);
 687                 list_add_tail(&mcast->list, &priv->multicast_list);
 688         }
 689
 690         if (!mcast->ah) {
 691                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 692                         skb_queue_tail(&mcast->pkt_queue, skb);
 693                 else {
 694                         ++dev->stats.tx_dropped;
 695                         dev_kfree_skb_any(skb);
 696                 }
 697
 698                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 699                         ipoib_dbg_mcast(priv, "no address vector, "
 700                                         "but multicast join already started\n");
 701                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 702                         ipoib_mcast_sendonly_join(mcast);
 703
 704                 /*
 705                  * If lookup completes between here and out:, don't
 706                  * want to send packet twice.
 707                  */
 708                 mcast = NULL;
 709         }
 710
 711 out:
 712         if (mcast && mcast->ah) {
 713                 if (skb->dst            &&
 714                     skb->dst->neighbour &&
 715                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 716                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
 717                                                                         skb->dev);
 718
 719                         if (neigh) {
 720                                 kref_get(&mcast->ah->ref);
 721                                 neigh->ah       = mcast->ah;
 722                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 723                         }
 724                 }
 725
 726                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 727         }
 728
 729 unlock:
 730         spin_unlock(&priv->lock);
 731 }
 732
 733 void ipoib_mcast_dev_flush(struct net_device *dev)
 734 {
 735         struct ipoib_dev_priv *priv = netdev_priv(dev);
 736         LIST_HEAD(remove_list);
 737         struct ipoib_mcast *mcast, *tmcast;
 738         unsigned long flags;
 739
 740         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 741
 742         spin_lock_irqsave(&priv->lock, flags);
 743
 744         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 745                 list_del(&mcast->list);
 746                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 747                 list_add_tail(&mcast->list, &remove_list);
 748         }
 749
 750         if (priv->broadcast) {
 751                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 752                 list_add_tail(&priv->broadcast->list, &remove_list);
 753                 priv->broadcast = NULL;
 754         }
 755
 756         spin_unlock_irqrestore(&priv->lock, flags);
 757
 758         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 759                 ipoib_mcast_leave(dev, mcast);
 760                 ipoib_mcast_free(mcast);
 761         }
 762 }
 763
 764 void ipoib_mcast_restart_task(struct work_struct *work)
 765 {
 766         struct ipoib_dev_priv *priv =
 767                 container_of(work, struct ipoib_dev_priv, restart_task);
 768         struct net_device *dev = priv->dev;
 769         struct dev_mc_list *mclist;
 770         struct ipoib_mcast *mcast, *tmcast;
 771         LIST_HEAD(remove_list);
 772         unsigned long flags;
 773         struct ib_sa_mcmember_rec rec;
 774
 775         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 776
 777         ipoib_mcast_stop_thread(dev, 0);
 778
 779         local_irq_save(flags);
 780         netif_addr_lock(dev);
 781         spin_lock(&priv->lock);
 782
 783         /*
 784          * Unfortunately, the networking core only gives us a list of all of
 785          * the multicast hardware addresses. We need to figure out which ones
 786          * are new and which ones have been removed
 787          */
 788
 789         /* Clear out the found flag */
 790         list_for_each_entry(mcast, &priv->multicast_list, list)
 791                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 792
 793         /* Mark all of the entries that are found or don't exist */
 794         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 795                 union ib_gid mgid;
 796
 797                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 798
 799                 mcast = __ipoib_mcast_find(dev, &mgid);
 800                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 801                         struct ipoib_mcast *nmcast;
 802
 803                         /* ignore group which is directly joined by userspace */
 804                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 805                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 806                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid "
 807                                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 808                                 continue;
 809                         }
 810
 811                         /* Not found or send-only group, let's add a new entry */
 812                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 813                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 814
 815                         nmcast = ipoib_mcast_alloc(dev, 0);
 816                         if (!nmcast) {
 817                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 818                                 continue;
 819                         }
 820
 821                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 822
 823                         nmcast->mcmember.mgid = mgid;
 824
 825                         if (mcast) {
 826                                 /* Destroy the send only entry */
 827                                 list_move_tail(&mcast->list, &remove_list);
 828
 829                                 rb_replace_node(&mcast->rb_node,
 830                                                 &nmcast->rb_node,
 831                                                 &priv->multicast_tree);
 832                         } else
 833                                 __ipoib_mcast_add(dev, nmcast);
 834
 835                         list_add_tail(&nmcast->list, &priv->multicast_list);
 836                 }
 837
 838                 if (mcast)
 839                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 840         }
 841
 842         /* Remove all of the entries don't exist anymore */
 843         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 844                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 845                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 846                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 847                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 848
 849                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 850
 851                         /* Move to the remove list */
 852                         list_move_tail(&mcast->list, &remove_list);
 853                 }
 854         }
 855
 856         spin_unlock(&priv->lock);
 857         netif_addr_unlock(dev);
 858         local_irq_restore(flags);
 859
 860         /* We have to cancel outside of the spinlock */
 861         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 862                 ipoib_mcast_leave(mcast->dev, mcast);
 863                 ipoib_mcast_free(mcast);
 864         }
 865
 866         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 867                 ipoib_mcast_start_thread(dev);
 868 }
 869
 870 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 871
 872 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 873 {
 874         struct ipoib_mcast_iter *iter;
 875
 876         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 877         if (!iter)
 878                 return NULL;
 879
 880         iter->dev = dev;
 881         memset(iter->mgid.raw, 0, 16);
 882
 883         if (ipoib_mcast_iter_next(iter)) {
 884                 kfree(iter);
 885                 return NULL;
 886         }
 887
 888         return iter;
 889 }
 890
 891 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 892 {
 893         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 894         struct rb_node *n;
 895         struct ipoib_mcast *mcast;
 896         int ret = 1;
 897
 898         spin_lock_irq(&priv->lock);
 899
 900         n = rb_first(&priv->multicast_tree);
 901
 902         while (n) {
 903                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 904
 905                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 906                            sizeof (union ib_gid)) < 0) {
 907                         iter->mgid      = mcast->mcmember.mgid;
 908                         iter->created   = mcast->created;
 909                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 910                         iter->complete  = !!mcast->ah;
 911                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 912
 913                         ret = 0;
 914
 915                         break;
 916                 }
 917
 918                 n = rb_next(n);
 919         }
 920
 921         spin_unlock_irq(&priv->lock);
 922
 923         return ret;
 924 }
 925
 926 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 927                            union ib_gid *mgid,
 928                            unsigned long *created,
 929                            unsigned int *queuelen,
 930                            unsigned int *complete,
 931                            unsigned int *send_only)
 932 {
 933         *mgid      = iter->mgid;
 934         *created   = iter->created;
 935         *queuelen  = iter->queuelen;
 936         *complete  = iter->complete;
 937         *send_only = iter->send_only;
 938 }
 939
 940 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */