drivers/infiniband/ulp/ipoib/ipoib_multicast.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/skbuff.h>
  36 #include <linux/rtnetlink.h>
  37 #include <linux/ip.h>
  38 #include <linux/in.h>
  39 #include <linux/igmp.h>
  40 #include <linux/inetdevice.h>
  41 #include <linux/delay.h>
  42 #include <linux/completion.h>
  43
  44 #include <net/dst.h>
  45
  46 #include "ipoib.h"
  47
  48 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  49 static int mcast_debug_level;
  50
  51 module_param(mcast_debug_level, int, 0644);
  52 MODULE_PARM_DESC(mcast_debug_level,
  53                  "Enable multicast debug tracing if > 0");
  54 #endif
  55
  56 static DEFINE_MUTEX(mcast_mutex);
  57
  58 struct ipoib_mcast_iter {
  59         struct net_device *dev;
  60         union ib_gid       mgid;
  61         unsigned long      created;
  62         unsigned int       queuelen;
  63         unsigned int       complete;
  64         unsigned int       send_only;
  65 };
  66
  67 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  68 {
  69         struct net_device *dev = mcast->dev;
  70         struct ipoib_dev_priv *priv = netdev_priv(dev);
  71         struct ipoib_neigh *neigh, *tmp;
  72         int tx_dropped = 0;
  73
  74         ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
  75                         mcast->mcmember.mgid.raw);
  76
  77         spin_lock_irq(&priv->lock);
  78
  79         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
  80                 /*
  81                  * It's safe to call ipoib_put_ah() inside priv->lock
  82                  * here, because we know that mcast->ah will always
  83                  * hold one more reference, so ipoib_put_ah() will
  84                  * never do more than decrement the ref count.
  85                  */
  86                 if (neigh->ah)
  87                         ipoib_put_ah(neigh->ah);
  88                 ipoib_neigh_free(dev, neigh);
  89         }
  90
  91         spin_unlock_irq(&priv->lock);
  92
  93         if (mcast->ah)
  94                 ipoib_put_ah(mcast->ah);
  95
  96         while (!skb_queue_empty(&mcast->pkt_queue)) {
  97                 ++tx_dropped;
  98                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
  99         }
 100
 101         netif_tx_lock_bh(dev);
 102         dev->stats.tx_dropped += tx_dropped;
 103         netif_tx_unlock_bh(dev);
 104
 105         kfree(mcast);
 106 }
 107
 108 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 109                                              int can_sleep)
 110 {
 111         struct ipoib_mcast *mcast;
 112
 113         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 114         if (!mcast)
 115                 return NULL;
 116
 117         mcast->dev = dev;
 118         mcast->created = jiffies;
 119         mcast->backoff = 1;
 120
 121         INIT_LIST_HEAD(&mcast->list);
 122         INIT_LIST_HEAD(&mcast->neigh_list);
 123         skb_queue_head_init(&mcast->pkt_queue);
 124
 125         return mcast;
 126 }
 127
 128 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 129 {
 130         struct ipoib_dev_priv *priv = netdev_priv(dev);
 131         struct rb_node *n = priv->multicast_tree.rb_node;
 132
 133         while (n) {
 134                 struct ipoib_mcast *mcast;
 135                 int ret;
 136
 137                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 138
 139                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 140                              sizeof (union ib_gid));
 141                 if (ret < 0)
 142                         n = n->rb_left;
 143                 else if (ret > 0)
 144                         n = n->rb_right;
 145                 else
 146                         return mcast;
 147         }
 148
 149         return NULL;
 150 }
 151
 152 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 153 {
 154         struct ipoib_dev_priv *priv = netdev_priv(dev);
 155         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 156
 157         while (*n) {
 158                 struct ipoib_mcast *tmcast;
 159                 int ret;
 160
 161                 pn = *n;
 162                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 163
 164                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 165                              sizeof (union ib_gid));
 166                 if (ret < 0)
 167                         n = &pn->rb_left;
 168                 else if (ret > 0)
 169                         n = &pn->rb_right;
 170                 else
 171                         return -EEXIST;
 172         }
 173
 174         rb_link_node(&mcast->rb_node, pn, n);
 175         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 176
 177         return 0;
 178 }
 179
 180 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 181                                    struct ib_sa_mcmember_rec *mcmember)
 182 {
 183         struct net_device *dev = mcast->dev;
 184         struct ipoib_dev_priv *priv = netdev_priv(dev);
 185         struct ipoib_ah *ah;
 186         int ret;
 187         int set_qkey = 0;
 188
 189         mcast->mcmember = *mcmember;
 190
 191         /* Set the cached Q_Key before we attach if it's the broadcast group */
 192         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 193                     sizeof (union ib_gid))) {
 194                 spin_lock_irq(&priv->lock);
 195                 if (!priv->broadcast) {
 196                         spin_unlock_irq(&priv->lock);
 197                         return -EAGAIN;
 198                 }
 199                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 200                 spin_unlock_irq(&priv->lock);
 201                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 202                 set_qkey = 1;
 203         }
 204
 205         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 206                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 207                         ipoib_warn(priv, "multicast group %pI6 already attached\n",
 208                                    mcast->mcmember.mgid.raw);
 209
 210                         return 0;
 211                 }
 212
 213                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 214                                          &mcast->mcmember.mgid, set_qkey);
 215                 if (ret < 0) {
 216                         ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
 217                                    mcast->mcmember.mgid.raw);
 218
 219                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 220                         return ret;
 221                 }
 222         }
 223
 224         {
 225                 struct ib_ah_attr av = {
 226                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 227                         .port_num      = priv->port,
 228                         .sl            = mcast->mcmember.sl,
 229                         .ah_flags      = IB_AH_GRH,
 230                         .static_rate   = mcast->mcmember.rate,
 231                         .grh           = {
 232                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 233                                 .hop_limit     = mcast->mcmember.hop_limit,
 234                                 .sgid_index    = 0,
 235                                 .traffic_class = mcast->mcmember.traffic_class
 236                         }
 237                 };
 238                 av.grh.dgid = mcast->mcmember.mgid;
 239
 240                 ah = ipoib_create_ah(dev, priv->pd, &av);
 241                 if (!ah) {
 242                         ipoib_warn(priv, "ib_address_create failed\n");
 243                 } else {
 244                         spin_lock_irq(&priv->lock);
 245                         mcast->ah = ah;
 246                         spin_unlock_irq(&priv->lock);
 247
 248                         ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
 249                                         mcast->mcmember.mgid.raw,
 250                                         mcast->ah->ah,
 251                                         be16_to_cpu(mcast->mcmember.mlid),
 252                                         mcast->mcmember.sl);
 253                 }
 254         }
 255
 256         /* actually send any queued packets */
 257         netif_tx_lock_bh(dev);
 258         while (!skb_queue_empty(&mcast->pkt_queue)) {
 259                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 260                 netif_tx_unlock_bh(dev);
 261
 262                 skb->dev = dev;
 263
 264                 if (!skb->dst || !skb->dst->neighbour) {
 265                         /* put pseudoheader back on for next time */
 266                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 267                 }
 268
 269                 if (dev_queue_xmit(skb))
 270                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 271                 netif_tx_lock_bh(dev);
 272         }
 273         netif_tx_unlock_bh(dev);
 274
 275         return 0;
 276 }
 277
 278 static int
 279 ipoib_mcast_sendonly_join_complete(int status,
 280                                    struct ib_sa_multicast *multicast)
 281 {
 282         struct ipoib_mcast *mcast = multicast->context;
 283         struct net_device *dev = mcast->dev;
 284
 285         /* We trap for port events ourselves. */
 286         if (status == -ENETRESET)
 287                 return 0;
 288
 289         if (!status)
 290                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 291
 292         if (status) {
 293                 if (mcast->logcount++ < 20)
 294                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for %pI6, status %d\n",
 295                                         mcast->mcmember.mgid.raw, status);
 296
 297                 /* Flush out any queued packets */
 298                 netif_tx_lock_bh(dev);
 299                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 300                         ++dev->stats.tx_dropped;
 301                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 302                 }
 303                 netif_tx_unlock_bh(dev);
 304
 305                 /* Clear the busy flag so we try again */
 306                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
 307                                             &mcast->flags);
 308         }
 309         return status;
 310 }
 311
 312 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 313 {
 314         struct net_device *dev = mcast->dev;
 315         struct ipoib_dev_priv *priv = netdev_priv(dev);
 316         struct ib_sa_mcmember_rec rec = {
 317 #if 0                           /* Some SMs don't support send-only yet */
 318                 .join_state = 4
 319 #else
 320                 .join_state = 1
 321 #endif
 322         };
 323         int ret = 0;
 324
 325         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 326                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 327                 return -ENODEV;
 328         }
 329
 330         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 331                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 332                 return -EBUSY;
 333         }
 334
 335         rec.mgid     = mcast->mcmember.mgid;
 336         rec.port_gid = priv->local_gid;
 337         rec.pkey     = cpu_to_be16(priv->pkey);
 338
 339         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 340                                          priv->port, &rec,
 341                                          IB_SA_MCMEMBER_REC_MGID        |
 342                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 343                                          IB_SA_MCMEMBER_REC_PKEY        |
 344                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 345                                          GFP_ATOMIC,
 346                                          ipoib_mcast_sendonly_join_complete,
 347                                          mcast);
 348         if (IS_ERR(mcast->mc)) {
 349                 ret = PTR_ERR(mcast->mc);
 350                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 351                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
 352                            ret);
 353         } else {
 354                 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n",
 355                                 mcast->mcmember.mgid.raw);
 356         }
 357
 358         return ret;
 359 }
 360
 361 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 362 {
 363         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 364                                                    carrier_on_task);
 365
 366         /*
 367          * Take rtnl_lock to avoid racing with ipoib_stop() and
 368          * turning the carrier back on while a device is being
 369          * removed.
 370          */
 371         rtnl_lock();
 372         netif_carrier_on(priv->dev);
 373         rtnl_unlock();
 374 }
 375
 376 static int ipoib_mcast_join_complete(int status,
 377                                      struct ib_sa_multicast *multicast)
 378 {
 379         struct ipoib_mcast *mcast = multicast->context;
 380         struct net_device *dev = mcast->dev;
 381         struct ipoib_dev_priv *priv = netdev_priv(dev);
 382
 383         ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
 384                         mcast->mcmember.mgid.raw, status);
 385
 386         /* We trap for port events ourselves. */
 387         if (status == -ENETRESET)
 388                 return 0;
 389
 390         if (!status)
 391                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 392
 393         if (!status) {
 394                 mcast->backoff = 1;
 395                 mutex_lock(&mcast_mutex);
 396                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 397                         queue_delayed_work(ipoib_workqueue,
 398                                            &priv->mcast_task, 0);
 399                 mutex_unlock(&mcast_mutex);
 400
 401                 /*
 402                  * Defer carrier on work to ipoib_workqueue to avoid a
 403                  * deadlock on rtnl_lock here.
 404                  */
 405                 if (mcast == priv->broadcast)
 406                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
 407
 408                 return 0;
 409         }
 410
 411         if (mcast->logcount++ < 20) {
 412                 if (status == -ETIMEDOUT) {
 413                         ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
 414                                         mcast->mcmember.mgid.raw, status);
 415                 } else {
 416                         ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
 417                                    mcast->mcmember.mgid.raw, status);
 418                 }
 419         }
 420
 421         mcast->backoff *= 2;
 422         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 423                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 424
 425         /* Clear the busy flag so we try again */
 426         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 427
 428         mutex_lock(&mcast_mutex);
 429         spin_lock_irq(&priv->lock);
 430         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 431                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 432                                    mcast->backoff * HZ);
 433         spin_unlock_irq(&priv->lock);
 434         mutex_unlock(&mcast_mutex);
 435
 436         return status;
 437 }
 438
 439 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 440                              int create)
 441 {
 442         struct ipoib_dev_priv *priv = netdev_priv(dev);
 443         struct ib_sa_mcmember_rec rec = {
 444                 .join_state = 1
 445         };
 446         ib_sa_comp_mask comp_mask;
 447         int ret = 0;
 448
 449         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 450
 451         rec.mgid     = mcast->mcmember.mgid;
 452         rec.port_gid = priv->local_gid;
 453         rec.pkey     = cpu_to_be16(priv->pkey);
 454
 455         comp_mask =
 456                 IB_SA_MCMEMBER_REC_MGID         |
 457                 IB_SA_MCMEMBER_REC_PORT_GID     |
 458                 IB_SA_MCMEMBER_REC_PKEY         |
 459                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 460
 461         if (create) {
 462                 comp_mask |=
 463                         IB_SA_MCMEMBER_REC_QKEY                 |
 464                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 465                         IB_SA_MCMEMBER_REC_MTU                  |
 466                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 467                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 468                         IB_SA_MCMEMBER_REC_RATE                 |
 469                         IB_SA_MCMEMBER_REC_SL                   |
 470                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 471                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 472
 473                 rec.qkey          = priv->broadcast->mcmember.qkey;
 474                 rec.mtu_selector  = IB_SA_EQ;
 475                 rec.mtu           = priv->broadcast->mcmember.mtu;
 476                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 477                 rec.rate_selector = IB_SA_EQ;
 478                 rec.rate          = priv->broadcast->mcmember.rate;
 479                 rec.sl            = priv->broadcast->mcmember.sl;
 480                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 481                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 482         }
 483
 484         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 485         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 486                                          &rec, comp_mask, GFP_KERNEL,
 487                                          ipoib_mcast_join_complete, mcast);
 488         if (IS_ERR(mcast->mc)) {
 489                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 490                 ret = PTR_ERR(mcast->mc);
 491                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 492
 493                 mcast->backoff *= 2;
 494                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 495                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 496
 497                 mutex_lock(&mcast_mutex);
 498                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 499                         queue_delayed_work(ipoib_workqueue,
 500                                            &priv->mcast_task,
 501                                            mcast->backoff * HZ);
 502                 mutex_unlock(&mcast_mutex);
 503         }
 504 }
 505
 506 void ipoib_mcast_join_task(struct work_struct *work)
 507 {
 508         struct ipoib_dev_priv *priv =
 509                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 510         struct net_device *dev = priv->dev;
 511
 512         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 513                 return;
 514
 515         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 516                 ipoib_warn(priv, "ib_query_gid() failed\n");
 517         else
 518                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 519
 520         {
 521                 struct ib_port_attr attr;
 522
 523                 if (!ib_query_port(priv->ca, priv->port, &attr))
 524                         priv->local_lid = attr.lid;
 525                 else
 526                         ipoib_warn(priv, "ib_query_port failed\n");
 527         }
 528
 529         if (!priv->broadcast) {
 530                 struct ipoib_mcast *broadcast;
 531
 532                 broadcast = ipoib_mcast_alloc(dev, 1);
 533                 if (!broadcast) {
 534                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 535                         mutex_lock(&mcast_mutex);
 536                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 537                                 queue_delayed_work(ipoib_workqueue,
 538                                                    &priv->mcast_task, HZ);
 539                         mutex_unlock(&mcast_mutex);
 540                         return;
 541                 }
 542
 543                 spin_lock_irq(&priv->lock);
 544                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 545                        sizeof (union ib_gid));
 546                 priv->broadcast = broadcast;
 547
 548                 __ipoib_mcast_add(dev, priv->broadcast);
 549                 spin_unlock_irq(&priv->lock);
 550         }
 551
 552         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 553                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 554                         ipoib_mcast_join(dev, priv->broadcast, 0);
 555                 return;
 556         }
 557
 558         while (1) {
 559                 struct ipoib_mcast *mcast = NULL;
 560
 561                 spin_lock_irq(&priv->lock);
 562                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 563                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 564                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 565                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 566                                 /* Found the next unjoined group */
 567                                 break;
 568                         }
 569                 }
 570                 spin_unlock_irq(&priv->lock);
 571
 572                 if (&mcast->list == &priv->multicast_list) {
 573                         /* All done */
 574                         break;
 575                 }
 576
 577                 ipoib_mcast_join(dev, mcast, 1);
 578                 return;
 579         }
 580
 581         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 582
 583         if (!ipoib_cm_admin_enabled(dev)) {
 584                 rtnl_lock();
 585                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
 586                 rtnl_unlock();
 587         }
 588
 589         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 590
 591         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 592 }
 593
 594 int ipoib_mcast_start_thread(struct net_device *dev)
 595 {
 596         struct ipoib_dev_priv *priv = netdev_priv(dev);
 597
 598         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 599
 600         mutex_lock(&mcast_mutex);
 601         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 602                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 603         mutex_unlock(&mcast_mutex);
 604
 605         return 0;
 606 }
 607
 608 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 609 {
 610         struct ipoib_dev_priv *priv = netdev_priv(dev);
 611
 612         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 613
 614         mutex_lock(&mcast_mutex);
 615         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 616         cancel_delayed_work(&priv->mcast_task);
 617         mutex_unlock(&mcast_mutex);
 618
 619         if (flush)
 620                 flush_workqueue(ipoib_workqueue);
 621
 622         return 0;
 623 }
 624
 625 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 626 {
 627         struct ipoib_dev_priv *priv = netdev_priv(dev);
 628         int ret = 0;
 629
 630         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 631                 ib_sa_free_multicast(mcast->mc);
 632
 633         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 634                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 635                                 mcast->mcmember.mgid.raw);
 636
 637                 /* Remove ourselves from the multicast group */
 638                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 639                                       be16_to_cpu(mcast->mcmember.mlid));
 640                 if (ret)
 641                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 642         }
 643
 644         return 0;
 645 }
 646
 647 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 648 {
 649         struct ipoib_dev_priv *priv = netdev_priv(dev);
 650         struct ipoib_mcast *mcast;
 651         unsigned long flags;
 652
 653         spin_lock_irqsave(&priv->lock, flags);
 654
 655         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 656             !priv->broadcast                                    ||
 657             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 658                 ++dev->stats.tx_dropped;
 659                 dev_kfree_skb_any(skb);
 660                 goto unlock;
 661         }
 662
 663         mcast = __ipoib_mcast_find(dev, mgid);
 664         if (!mcast) {
 665                 /* Let's create a new send only group now */
 666                 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 667                                 mgid);
 668
 669                 mcast = ipoib_mcast_alloc(dev, 0);
 670                 if (!mcast) {
 671                         ipoib_warn(priv, "unable to allocate memory for "
 672                                    "multicast structure\n");
 673                         ++dev->stats.tx_dropped;
 674                         dev_kfree_skb_any(skb);
 675                         goto out;
 676                 }
 677
 678                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 679                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 680                 __ipoib_mcast_add(dev, mcast);
 681                 list_add_tail(&mcast->list, &priv->multicast_list);
 682         }
 683
 684         if (!mcast->ah) {
 685                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 686                         skb_queue_tail(&mcast->pkt_queue, skb);
 687                 else {
 688                         ++dev->stats.tx_dropped;
 689                         dev_kfree_skb_any(skb);
 690                 }
 691
 692                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 693                         ipoib_dbg_mcast(priv, "no address vector, "
 694                                         "but multicast join already started\n");
 695                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 696                         ipoib_mcast_sendonly_join(mcast);
 697
 698                 /*
 699                  * If lookup completes between here and out:, don't
 700                  * want to send packet twice.
 701                  */
 702                 mcast = NULL;
 703         }
 704
 705 out:
 706         if (mcast && mcast->ah) {
 707                 if (skb->dst            &&
 708                     skb->dst->neighbour &&
 709                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 710                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
 711                                                                         skb->dev);
 712
 713                         if (neigh) {
 714                                 kref_get(&mcast->ah->ref);
 715                                 neigh->ah       = mcast->ah;
 716                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 717                         }
 718                 }
 719
 720                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 721         }
 722
 723 unlock:
 724         spin_unlock_irqrestore(&priv->lock, flags);
 725 }
 726
 727 void ipoib_mcast_dev_flush(struct net_device *dev)
 728 {
 729         struct ipoib_dev_priv *priv = netdev_priv(dev);
 730         LIST_HEAD(remove_list);
 731         struct ipoib_mcast *mcast, *tmcast;
 732         unsigned long flags;
 733
 734         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 735
 736         spin_lock_irqsave(&priv->lock, flags);
 737
 738         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 739                 list_del(&mcast->list);
 740                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 741                 list_add_tail(&mcast->list, &remove_list);
 742         }
 743
 744         if (priv->broadcast) {
 745                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 746                 list_add_tail(&priv->broadcast->list, &remove_list);
 747                 priv->broadcast = NULL;
 748         }
 749
 750         spin_unlock_irqrestore(&priv->lock, flags);
 751
 752         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 753                 ipoib_mcast_leave(dev, mcast);
 754                 ipoib_mcast_free(mcast);
 755         }
 756 }
 757
 758 void ipoib_mcast_restart_task(struct work_struct *work)
 759 {
 760         struct ipoib_dev_priv *priv =
 761                 container_of(work, struct ipoib_dev_priv, restart_task);
 762         struct net_device *dev = priv->dev;
 763         struct dev_mc_list *mclist;
 764         struct ipoib_mcast *mcast, *tmcast;
 765         LIST_HEAD(remove_list);
 766         unsigned long flags;
 767         struct ib_sa_mcmember_rec rec;
 768
 769         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 770
 771         ipoib_mcast_stop_thread(dev, 0);
 772
 773         local_irq_save(flags);
 774         netif_addr_lock(dev);
 775         spin_lock(&priv->lock);
 776
 777         /*
 778          * Unfortunately, the networking core only gives us a list of all of
 779          * the multicast hardware addresses. We need to figure out which ones
 780          * are new and which ones have been removed
 781          */
 782
 783         /* Clear out the found flag */
 784         list_for_each_entry(mcast, &priv->multicast_list, list)
 785                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 786
 787         /* Mark all of the entries that are found or don't exist */
 788         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 789                 union ib_gid mgid;
 790
 791                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 792
 793                 mcast = __ipoib_mcast_find(dev, &mgid);
 794                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 795                         struct ipoib_mcast *nmcast;
 796
 797                         /* ignore group which is directly joined by userspace */
 798                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 799                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 800                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 801                                                 mgid.raw);
 802                                 continue;
 803                         }
 804
 805                         /* Not found or send-only group, let's add a new entry */
 806                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 807                                         mgid.raw);
 808
 809                         nmcast = ipoib_mcast_alloc(dev, 0);
 810                         if (!nmcast) {
 811                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 812                                 continue;
 813                         }
 814
 815                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 816
 817                         nmcast->mcmember.mgid = mgid;
 818
 819                         if (mcast) {
 820                                 /* Destroy the send only entry */
 821                                 list_move_tail(&mcast->list, &remove_list);
 822
 823                                 rb_replace_node(&mcast->rb_node,
 824                                                 &nmcast->rb_node,
 825                                                 &priv->multicast_tree);
 826                         } else
 827                                 __ipoib_mcast_add(dev, nmcast);
 828
 829                         list_add_tail(&nmcast->list, &priv->multicast_list);
 830                 }
 831
 832                 if (mcast)
 833                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 834         }
 835
 836         /* Remove all of the entries don't exist anymore */
 837         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 838                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 839                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 840                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 841                                         mcast->mcmember.mgid.raw);
 842
 843                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 844
 845                         /* Move to the remove list */
 846                         list_move_tail(&mcast->list, &remove_list);
 847                 }
 848         }
 849
 850         spin_unlock(&priv->lock);
 851         netif_addr_unlock(dev);
 852         local_irq_restore(flags);
 853
 854         /* We have to cancel outside of the spinlock */
 855         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 856                 ipoib_mcast_leave(mcast->dev, mcast);
 857                 ipoib_mcast_free(mcast);
 858         }
 859
 860         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 861                 ipoib_mcast_start_thread(dev);
 862 }
 863
 864 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 865
 866 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 867 {
 868         struct ipoib_mcast_iter *iter;
 869
 870         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 871         if (!iter)
 872                 return NULL;
 873
 874         iter->dev = dev;
 875         memset(iter->mgid.raw, 0, 16);
 876
 877         if (ipoib_mcast_iter_next(iter)) {
 878                 kfree(iter);
 879                 return NULL;
 880         }
 881
 882         return iter;
 883 }
 884
 885 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 886 {
 887         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 888         struct rb_node *n;
 889         struct ipoib_mcast *mcast;
 890         int ret = 1;
 891
 892         spin_lock_irq(&priv->lock);
 893
 894         n = rb_first(&priv->multicast_tree);
 895
 896         while (n) {
 897                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 898
 899                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 900                            sizeof (union ib_gid)) < 0) {
 901                         iter->mgid      = mcast->mcmember.mgid;
 902                         iter->created   = mcast->created;
 903                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 904                         iter->complete  = !!mcast->ah;
 905                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 906
 907                         ret = 0;
 908
 909                         break;
 910                 }
 911
 912                 n = rb_next(n);
 913         }
 914
 915         spin_unlock_irq(&priv->lock);
 916
 917         return ret;
 918 }
 919
 920 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 921                            union ib_gid *mgid,
 922                            unsigned long *created,
 923                            unsigned int *queuelen,
 924                            unsigned int *complete,
 925                            unsigned int *send_only)
 926 {
 927         *mgid      = iter->mgid;
 928         *created   = iter->created;
 929         *queuelen  = iter->queuelen;
 930         *complete  = iter->complete;
 931         *send_only = iter->send_only;
 932 }
 933
 934 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */