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/moduleparam.h>
  38 #include <linux/ip.h>
  39 #include <linux/in.h>
  40 #include <linux/igmp.h>
  41 #include <linux/inetdevice.h>
  42 #include <linux/delay.h>
  43 #include <linux/completion.h>
  44 #include <linux/slab.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 struct ipoib_mcast_iter {
  61         struct net_device *dev;
  62         union ib_gid       mgid;
  63         unsigned long      created;
  64         unsigned int       queuelen;
  65         unsigned int       complete;
  66         unsigned int       send_only;
  67 };
  68
  69 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  70 {
  71         struct net_device *dev = mcast->dev;
  72         struct ipoib_dev_priv *priv = netdev_priv(dev);
  73         struct ipoib_neigh *neigh, *tmp;
  74         int tx_dropped = 0;
  75
  76         ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
  77                         mcast->mcmember.mgid.raw);
  78
  79         spin_lock_irq(&priv->lock);
  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_irq(&priv->lock);
  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         netif_tx_lock_bh(dev);
 104         dev->stats.tx_dropped += tx_dropped;
 105         netif_tx_unlock_bh(dev);
 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 %pI6 already attached\n",
 210                                    mcast->mcmember.mgid.raw);
 211
 212                         return 0;
 213                 }
 214
 215                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 216                                          &mcast->mcmember.mgid, set_qkey);
 217                 if (ret < 0) {
 218                         ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
 219                                    mcast->mcmember.mgid.raw);
 220
 221                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 222                         return ret;
 223                 }
 224         }
 225
 226         {
 227                 struct ib_ah_attr av = {
 228                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 229                         .port_num      = priv->port,
 230                         .sl            = mcast->mcmember.sl,
 231                         .ah_flags      = IB_AH_GRH,
 232                         .static_rate   = mcast->mcmember.rate,
 233                         .grh           = {
 234                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 235                                 .hop_limit     = mcast->mcmember.hop_limit,
 236                                 .sgid_index    = 0,
 237                                 .traffic_class = mcast->mcmember.traffic_class
 238                         }
 239                 };
 240                 av.grh.dgid = mcast->mcmember.mgid;
 241
 242                 ah = ipoib_create_ah(dev, priv->pd, &av);
 243                 if (IS_ERR(ah)) {
 244                         ipoib_warn(priv, "ib_address_create failed %ld\n",
 245                                 -PTR_ERR(ah));
 246                         /* use original error */
 247                         return PTR_ERR(ah);
 248                 } else {
 249                         spin_lock_irq(&priv->lock);
 250                         mcast->ah = ah;
 251                         spin_unlock_irq(&priv->lock);
 252
 253                         ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
 254                                         mcast->mcmember.mgid.raw,
 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         netif_tx_lock_bh(dev);
 263         while (!skb_queue_empty(&mcast->pkt_queue)) {
 264                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 265                 struct dst_entry *dst = skb_dst(skb);
 266                 struct neighbour *n = NULL;
 267
 268                 netif_tx_unlock_bh(dev);
 269
 270                 skb->dev = dev;
 271                 if (dst)
 272                         n = dst_get_neighbour_raw(dst);
 273                 if (!dst || !n) {
 274                         /* put pseudoheader back on for next time */
 275                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 276                 }
 277
 278                 if (dev_queue_xmit(skb))
 279                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 280                 netif_tx_lock_bh(dev);
 281         }
 282         netif_tx_unlock_bh(dev);
 283
 284         return 0;
 285 }
 286
 287 static int
 288 ipoib_mcast_sendonly_join_complete(int status,
 289                                    struct ib_sa_multicast *multicast)
 290 {
 291         struct ipoib_mcast *mcast = multicast->context;
 292         struct net_device *dev = mcast->dev;
 293
 294         /* We trap for port events ourselves. */
 295         if (status == -ENETRESET)
 296                 return 0;
 297
 298         if (!status)
 299                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 300
 301         if (status) {
 302                 if (mcast->logcount++ < 20)
 303                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for %pI6, status %d\n",
 304                                         mcast->mcmember.mgid.raw, status);
 305
 306                 /* Flush out any queued packets */
 307                 netif_tx_lock_bh(dev);
 308                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 309                         ++dev->stats.tx_dropped;
 310                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 311                 }
 312                 netif_tx_unlock_bh(dev);
 313
 314                 /* Clear the busy flag so we try again */
 315                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
 316                                             &mcast->flags);
 317         }
 318         return status;
 319 }
 320
 321 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 322 {
 323         struct net_device *dev = mcast->dev;
 324         struct ipoib_dev_priv *priv = netdev_priv(dev);
 325         struct ib_sa_mcmember_rec rec = {
 326 #if 0                           /* Some SMs don't support send-only yet */
 327                 .join_state = 4
 328 #else
 329                 .join_state = 1
 330 #endif
 331         };
 332         int ret = 0;
 333
 334         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 335                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 336                 return -ENODEV;
 337         }
 338
 339         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 340                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 341                 return -EBUSY;
 342         }
 343
 344         rec.mgid     = mcast->mcmember.mgid;
 345         rec.port_gid = priv->local_gid;
 346         rec.pkey     = cpu_to_be16(priv->pkey);
 347
 348         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 349                                          priv->port, &rec,
 350                                          IB_SA_MCMEMBER_REC_MGID        |
 351                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 352                                          IB_SA_MCMEMBER_REC_PKEY        |
 353                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 354                                          GFP_ATOMIC,
 355                                          ipoib_mcast_sendonly_join_complete,
 356                                          mcast);
 357         if (IS_ERR(mcast->mc)) {
 358                 ret = PTR_ERR(mcast->mc);
 359                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 360                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
 361                            ret);
 362         } else {
 363                 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n",
 364                                 mcast->mcmember.mgid.raw);
 365         }
 366
 367         return ret;
 368 }
 369
 370 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 371 {
 372         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 373                                                    carrier_on_task);
 374         struct ib_port_attr attr;
 375
 376         /*
 377          * Take rtnl_lock to avoid racing with ipoib_stop() and
 378          * turning the carrier back on while a device is being
 379          * removed.
 380          */
 381         if (ib_query_port(priv->ca, priv->port, &attr) ||
 382             attr.state != IB_PORT_ACTIVE) {
 383                 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
 384                 return;
 385         }
 386
 387         rtnl_lock();
 388         netif_carrier_on(priv->dev);
 389         rtnl_unlock();
 390 }
 391
 392 static int ipoib_mcast_join_complete(int status,
 393                                      struct ib_sa_multicast *multicast)
 394 {
 395         struct ipoib_mcast *mcast = multicast->context;
 396         struct net_device *dev = mcast->dev;
 397         struct ipoib_dev_priv *priv = netdev_priv(dev);
 398
 399         ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
 400                         mcast->mcmember.mgid.raw, status);
 401
 402         /* We trap for port events ourselves. */
 403         if (status == -ENETRESET)
 404                 return 0;
 405
 406         if (!status)
 407                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 408
 409         if (!status) {
 410                 mcast->backoff = 1;
 411                 mutex_lock(&mcast_mutex);
 412                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 413                         queue_delayed_work(ipoib_workqueue,
 414                                            &priv->mcast_task, 0);
 415                 mutex_unlock(&mcast_mutex);
 416
 417                 /*
 418                  * Defer carrier on work to ipoib_workqueue to avoid a
 419                  * deadlock on rtnl_lock here.
 420                  */
 421                 if (mcast == priv->broadcast)
 422                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
 423
 424                 return 0;
 425         }
 426
 427         if (mcast->logcount++ < 20) {
 428                 if (status == -ETIMEDOUT || status == -EAGAIN) {
 429                         ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
 430                                         mcast->mcmember.mgid.raw, status);
 431                 } else {
 432                         ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
 433                                    mcast->mcmember.mgid.raw, status);
 434                 }
 435         }
 436
 437         mcast->backoff *= 2;
 438         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 439                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 440
 441         /* Clear the busy flag so we try again */
 442         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 443
 444         mutex_lock(&mcast_mutex);
 445         spin_lock_irq(&priv->lock);
 446         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 447                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 448                                    mcast->backoff * HZ);
 449         spin_unlock_irq(&priv->lock);
 450         mutex_unlock(&mcast_mutex);
 451
 452         return status;
 453 }
 454
 455 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 456                              int create)
 457 {
 458         struct ipoib_dev_priv *priv = netdev_priv(dev);
 459         struct ib_sa_mcmember_rec rec = {
 460                 .join_state = 1
 461         };
 462         ib_sa_comp_mask comp_mask;
 463         int ret = 0;
 464
 465         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 466
 467         rec.mgid     = mcast->mcmember.mgid;
 468         rec.port_gid = priv->local_gid;
 469         rec.pkey     = cpu_to_be16(priv->pkey);
 470
 471         comp_mask =
 472                 IB_SA_MCMEMBER_REC_MGID         |
 473                 IB_SA_MCMEMBER_REC_PORT_GID     |
 474                 IB_SA_MCMEMBER_REC_PKEY         |
 475                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 476
 477         if (create) {
 478                 comp_mask |=
 479                         IB_SA_MCMEMBER_REC_QKEY                 |
 480                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 481                         IB_SA_MCMEMBER_REC_MTU                  |
 482                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 483                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 484                         IB_SA_MCMEMBER_REC_RATE                 |
 485                         IB_SA_MCMEMBER_REC_SL                   |
 486                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 487                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 488
 489                 rec.qkey          = priv->broadcast->mcmember.qkey;
 490                 rec.mtu_selector  = IB_SA_EQ;
 491                 rec.mtu           = priv->broadcast->mcmember.mtu;
 492                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 493                 rec.rate_selector = IB_SA_EQ;
 494                 rec.rate          = priv->broadcast->mcmember.rate;
 495                 rec.sl            = priv->broadcast->mcmember.sl;
 496                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 497                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 498         }
 499
 500         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 501         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 502                                          &rec, comp_mask, GFP_KERNEL,
 503                                          ipoib_mcast_join_complete, mcast);
 504         if (IS_ERR(mcast->mc)) {
 505                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 506                 ret = PTR_ERR(mcast->mc);
 507                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 508
 509                 mcast->backoff *= 2;
 510                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 511                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 512
 513                 mutex_lock(&mcast_mutex);
 514                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 515                         queue_delayed_work(ipoib_workqueue,
 516                                            &priv->mcast_task,
 517                                            mcast->backoff * HZ);
 518                 mutex_unlock(&mcast_mutex);
 519         }
 520 }
 521
 522 void ipoib_mcast_join_task(struct work_struct *work)
 523 {
 524         struct ipoib_dev_priv *priv =
 525                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 526         struct net_device *dev = priv->dev;
 527
 528         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 529                 return;
 530
 531         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 532                 ipoib_warn(priv, "ib_query_gid() failed\n");
 533         else
 534                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 535
 536         {
 537                 struct ib_port_attr attr;
 538
 539                 if (!ib_query_port(priv->ca, priv->port, &attr))
 540                         priv->local_lid = attr.lid;
 541                 else
 542                         ipoib_warn(priv, "ib_query_port failed\n");
 543         }
 544
 545         if (!priv->broadcast) {
 546                 struct ipoib_mcast *broadcast;
 547
 548                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 549                         return;
 550
 551                 broadcast = ipoib_mcast_alloc(dev, 1);
 552                 if (!broadcast) {
 553                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 554                         mutex_lock(&mcast_mutex);
 555                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 556                                 queue_delayed_work(ipoib_workqueue,
 557                                                    &priv->mcast_task, HZ);
 558                         mutex_unlock(&mcast_mutex);
 559                         return;
 560                 }
 561
 562                 spin_lock_irq(&priv->lock);
 563                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 564                        sizeof (union ib_gid));
 565                 priv->broadcast = broadcast;
 566
 567                 __ipoib_mcast_add(dev, priv->broadcast);
 568                 spin_unlock_irq(&priv->lock);
 569         }
 570
 571         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 572                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 573                         ipoib_mcast_join(dev, priv->broadcast, 0);
 574                 return;
 575         }
 576
 577         while (1) {
 578                 struct ipoib_mcast *mcast = NULL;
 579
 580                 spin_lock_irq(&priv->lock);
 581                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 582                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 583                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 584                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 585                                 /* Found the next unjoined group */
 586                                 break;
 587                         }
 588                 }
 589                 spin_unlock_irq(&priv->lock);
 590
 591                 if (&mcast->list == &priv->multicast_list) {
 592                         /* All done */
 593                         break;
 594                 }
 595
 596                 ipoib_mcast_join(dev, mcast, 1);
 597                 return;
 598         }
 599
 600         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 601
 602         if (!ipoib_cm_admin_enabled(dev)) {
 603                 rtnl_lock();
 604                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
 605                 rtnl_unlock();
 606         }
 607
 608         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 609
 610         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 611 }
 612
 613 int ipoib_mcast_start_thread(struct net_device *dev)
 614 {
 615         struct ipoib_dev_priv *priv = netdev_priv(dev);
 616
 617         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 618
 619         mutex_lock(&mcast_mutex);
 620         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 621                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 622         mutex_unlock(&mcast_mutex);
 623
 624         return 0;
 625 }
 626
 627 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 628 {
 629         struct ipoib_dev_priv *priv = netdev_priv(dev);
 630
 631         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 632
 633         mutex_lock(&mcast_mutex);
 634         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 635         cancel_delayed_work(&priv->mcast_task);
 636         mutex_unlock(&mcast_mutex);
 637
 638         if (flush)
 639                 flush_workqueue(ipoib_workqueue);
 640
 641         return 0;
 642 }
 643
 644 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 645 {
 646         struct ipoib_dev_priv *priv = netdev_priv(dev);
 647         int ret = 0;
 648
 649         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 650                 ib_sa_free_multicast(mcast->mc);
 651
 652         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 653                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 654                                 mcast->mcmember.mgid.raw);
 655
 656                 /* Remove ourselves from the multicast group */
 657                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 658                                       be16_to_cpu(mcast->mcmember.mlid));
 659                 if (ret)
 660                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 661         }
 662
 663         return 0;
 664 }
 665
 666 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 667 {
 668         struct ipoib_dev_priv *priv = netdev_priv(dev);
 669         struct ipoib_mcast *mcast;
 670         unsigned long flags;
 671
 672         spin_lock_irqsave(&priv->lock, flags);
 673
 674         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 675             !priv->broadcast                                    ||
 676             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 677                 ++dev->stats.tx_dropped;
 678                 dev_kfree_skb_any(skb);
 679                 goto unlock;
 680         }
 681
 682         mcast = __ipoib_mcast_find(dev, mgid);
 683         if (!mcast) {
 684                 /* Let's create a new send only group now */
 685                 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 686                                 mgid);
 687
 688                 mcast = ipoib_mcast_alloc(dev, 0);
 689                 if (!mcast) {
 690                         ipoib_warn(priv, "unable to allocate memory for "
 691                                    "multicast structure\n");
 692                         ++dev->stats.tx_dropped;
 693                         dev_kfree_skb_any(skb);
 694                         goto out;
 695                 }
 696
 697                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 698                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 699                 __ipoib_mcast_add(dev, mcast);
 700                 list_add_tail(&mcast->list, &priv->multicast_list);
 701         }
 702
 703         if (!mcast->ah) {
 704                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 705                         skb_queue_tail(&mcast->pkt_queue, skb);
 706                 else {
 707                         ++dev->stats.tx_dropped;
 708                         dev_kfree_skb_any(skb);
 709                 }
 710
 711                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 712                         ipoib_dbg_mcast(priv, "no address vector, "
 713                                         "but multicast join already started\n");
 714                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 715                         ipoib_mcast_sendonly_join(mcast);
 716
 717                 /*
 718                  * If lookup completes between here and out:, don't
 719                  * want to send packet twice.
 720                  */
 721                 mcast = NULL;
 722         }
 723
 724 out:
 725         if (mcast && mcast->ah) {
 726                 struct dst_entry *dst = skb_dst(skb);
 727                 struct neighbour *n = NULL;
 728
 729                 rcu_read_lock();
 730                 if (dst)
 731                         n = dst_get_neighbour(dst);
 732                 if (n && !*to_ipoib_neigh(n)) {
 733                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(n,
 734                                                                       skb->dev);
 735
 736                         if (neigh) {
 737                                 kref_get(&mcast->ah->ref);
 738                                 neigh->ah       = mcast->ah;
 739                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 740                         }
 741                 }
 742                 rcu_read_unlock();
 743                 spin_unlock_irqrestore(&priv->lock, flags);
 744                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 745                 return;
 746         }
 747
 748 unlock:
 749         spin_unlock_irqrestore(&priv->lock, flags);
 750 }
 751
 752 void ipoib_mcast_dev_flush(struct net_device *dev)
 753 {
 754         struct ipoib_dev_priv *priv = netdev_priv(dev);
 755         LIST_HEAD(remove_list);
 756         struct ipoib_mcast *mcast, *tmcast;
 757         unsigned long flags;
 758
 759         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 760
 761         spin_lock_irqsave(&priv->lock, flags);
 762
 763         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 764                 list_del(&mcast->list);
 765                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 766                 list_add_tail(&mcast->list, &remove_list);
 767         }
 768
 769         if (priv->broadcast) {
 770                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 771                 list_add_tail(&priv->broadcast->list, &remove_list);
 772                 priv->broadcast = NULL;
 773         }
 774
 775         spin_unlock_irqrestore(&priv->lock, flags);
 776
 777         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 778                 ipoib_mcast_leave(dev, mcast);
 779                 ipoib_mcast_free(mcast);
 780         }
 781 }
 782
 783 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
 784 {
 785         /* reserved QPN, prefix, scope */
 786         if (memcmp(addr, broadcast, 6))
 787                 return 0;
 788         /* signature lower, pkey */
 789         if (memcmp(addr + 7, broadcast + 7, 3))
 790                 return 0;
 791         return 1;
 792 }
 793
 794 void ipoib_mcast_restart_task(struct work_struct *work)
 795 {
 796         struct ipoib_dev_priv *priv =
 797                 container_of(work, struct ipoib_dev_priv, restart_task);
 798         struct net_device *dev = priv->dev;
 799         struct netdev_hw_addr *ha;
 800         struct ipoib_mcast *mcast, *tmcast;
 801         LIST_HEAD(remove_list);
 802         unsigned long flags;
 803         struct ib_sa_mcmember_rec rec;
 804
 805         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 806
 807         ipoib_mcast_stop_thread(dev, 0);
 808
 809         local_irq_save(flags);
 810         netif_addr_lock(dev);
 811         spin_lock(&priv->lock);
 812
 813         /*
 814          * Unfortunately, the networking core only gives us a list of all of
 815          * the multicast hardware addresses. We need to figure out which ones
 816          * are new and which ones have been removed
 817          */
 818
 819         /* Clear out the found flag */
 820         list_for_each_entry(mcast, &priv->multicast_list, list)
 821                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 822
 823         /* Mark all of the entries that are found or don't exist */
 824         netdev_for_each_mc_addr(ha, dev) {
 825                 union ib_gid mgid;
 826
 827                 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
 828                         continue;
 829
 830                 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
 831
 832                 mcast = __ipoib_mcast_find(dev, &mgid);
 833                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 834                         struct ipoib_mcast *nmcast;
 835
 836                         /* ignore group which is directly joined by userspace */
 837                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 838                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 839                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 840                                                 mgid.raw);
 841                                 continue;
 842                         }
 843
 844                         /* Not found or send-only group, let's add a new entry */
 845                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 846                                         mgid.raw);
 847
 848                         nmcast = ipoib_mcast_alloc(dev, 0);
 849                         if (!nmcast) {
 850                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 851                                 continue;
 852                         }
 853
 854                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 855
 856                         nmcast->mcmember.mgid = mgid;
 857
 858                         if (mcast) {
 859                                 /* Destroy the send only entry */
 860                                 list_move_tail(&mcast->list, &remove_list);
 861
 862                                 rb_replace_node(&mcast->rb_node,
 863                                                 &nmcast->rb_node,
 864                                                 &priv->multicast_tree);
 865                         } else
 866                                 __ipoib_mcast_add(dev, nmcast);
 867
 868                         list_add_tail(&nmcast->list, &priv->multicast_list);
 869                 }
 870
 871                 if (mcast)
 872                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 873         }
 874
 875         /* Remove all of the entries don't exist anymore */
 876         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 877                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 878                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 879                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 880                                         mcast->mcmember.mgid.raw);
 881
 882                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 883
 884                         /* Move to the remove list */
 885                         list_move_tail(&mcast->list, &remove_list);
 886                 }
 887         }
 888
 889         spin_unlock(&priv->lock);
 890         netif_addr_unlock(dev);
 891         local_irq_restore(flags);
 892
 893         /* We have to cancel outside of the spinlock */
 894         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 895                 ipoib_mcast_leave(mcast->dev, mcast);
 896                 ipoib_mcast_free(mcast);
 897         }
 898
 899         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 900                 ipoib_mcast_start_thread(dev);
 901 }
 902
 903 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 904
 905 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 906 {
 907         struct ipoib_mcast_iter *iter;
 908
 909         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 910         if (!iter)
 911                 return NULL;
 912
 913         iter->dev = dev;
 914         memset(iter->mgid.raw, 0, 16);
 915
 916         if (ipoib_mcast_iter_next(iter)) {
 917                 kfree(iter);
 918                 return NULL;
 919         }
 920
 921         return iter;
 922 }
 923
 924 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 925 {
 926         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 927         struct rb_node *n;
 928         struct ipoib_mcast *mcast;
 929         int ret = 1;
 930
 931         spin_lock_irq(&priv->lock);
 932
 933         n = rb_first(&priv->multicast_tree);
 934
 935         while (n) {
 936                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 937
 938                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 939                            sizeof (union ib_gid)) < 0) {
 940                         iter->mgid      = mcast->mcmember.mgid;
 941                         iter->created   = mcast->created;
 942                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 943                         iter->complete  = !!mcast->ah;
 944                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 945
 946                         ret = 0;
 947
 948                         break;
 949                 }
 950
 951                 n = rb_next(n);
 952         }
 953
 954         spin_unlock_irq(&priv->lock);
 955
 956         return ret;
 957 }
 958
 959 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 960                            union ib_gid *mgid,
 961                            unsigned long *created,
 962                            unsigned int *queuelen,
 963                            unsigned int *complete,
 964                            unsigned int *send_only)
 965 {
 966         *mgid      = iter->mgid;
 967         *created   = iter->created;
 968         *queuelen  = iter->queuelen;
 969         *complete  = iter->complete;
 970         *send_only = iter->send_only;
 971 }
 972
 973 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */