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) || !skb_dst(skb)->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         struct ib_port_attr attr;
 366
 367         /*
 368          * Take rtnl_lock to avoid racing with ipoib_stop() and
 369          * turning the carrier back on while a device is being
 370          * removed.
 371          */
 372         if (ib_query_port(priv->ca, priv->port, &attr) ||
 373             attr.state != IB_PORT_ACTIVE) {
 374                 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
 375                 return;
 376         }
 377
 378         rtnl_lock();
 379         netif_carrier_on(priv->dev);
 380         rtnl_unlock();
 381 }
 382
 383 static int ipoib_mcast_join_complete(int status,
 384                                      struct ib_sa_multicast *multicast)
 385 {
 386         struct ipoib_mcast *mcast = multicast->context;
 387         struct net_device *dev = mcast->dev;
 388         struct ipoib_dev_priv *priv = netdev_priv(dev);
 389
 390         ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
 391                         mcast->mcmember.mgid.raw, status);
 392
 393         /* We trap for port events ourselves. */
 394         if (status == -ENETRESET)
 395                 return 0;
 396
 397         if (!status)
 398                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 399
 400         if (!status) {
 401                 mcast->backoff = 1;
 402                 mutex_lock(&mcast_mutex);
 403                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 404                         queue_delayed_work(ipoib_workqueue,
 405                                            &priv->mcast_task, 0);
 406                 mutex_unlock(&mcast_mutex);
 407
 408                 /*
 409                  * Defer carrier on work to ipoib_workqueue to avoid a
 410                  * deadlock on rtnl_lock here.
 411                  */
 412                 if (mcast == priv->broadcast)
 413                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
 414
 415                 return 0;
 416         }
 417
 418         if (mcast->logcount++ < 20) {
 419                 if (status == -ETIMEDOUT || status == -EAGAIN) {
 420                         ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
 421                                         mcast->mcmember.mgid.raw, status);
 422                 } else {
 423                         ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
 424                                    mcast->mcmember.mgid.raw, status);
 425                 }
 426         }
 427
 428         mcast->backoff *= 2;
 429         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 430                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 431
 432         /* Clear the busy flag so we try again */
 433         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 434
 435         mutex_lock(&mcast_mutex);
 436         spin_lock_irq(&priv->lock);
 437         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 438                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 439                                    mcast->backoff * HZ);
 440         spin_unlock_irq(&priv->lock);
 441         mutex_unlock(&mcast_mutex);
 442
 443         return status;
 444 }
 445
 446 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 447                              int create)
 448 {
 449         struct ipoib_dev_priv *priv = netdev_priv(dev);
 450         struct ib_sa_mcmember_rec rec = {
 451                 .join_state = 1
 452         };
 453         ib_sa_comp_mask comp_mask;
 454         int ret = 0;
 455
 456         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 457
 458         rec.mgid     = mcast->mcmember.mgid;
 459         rec.port_gid = priv->local_gid;
 460         rec.pkey     = cpu_to_be16(priv->pkey);
 461
 462         comp_mask =
 463                 IB_SA_MCMEMBER_REC_MGID         |
 464                 IB_SA_MCMEMBER_REC_PORT_GID     |
 465                 IB_SA_MCMEMBER_REC_PKEY         |
 466                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 467
 468         if (create) {
 469                 comp_mask |=
 470                         IB_SA_MCMEMBER_REC_QKEY                 |
 471                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 472                         IB_SA_MCMEMBER_REC_MTU                  |
 473                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 474                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 475                         IB_SA_MCMEMBER_REC_RATE                 |
 476                         IB_SA_MCMEMBER_REC_SL                   |
 477                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 478                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 479
 480                 rec.qkey          = priv->broadcast->mcmember.qkey;
 481                 rec.mtu_selector  = IB_SA_EQ;
 482                 rec.mtu           = priv->broadcast->mcmember.mtu;
 483                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 484                 rec.rate_selector = IB_SA_EQ;
 485                 rec.rate          = priv->broadcast->mcmember.rate;
 486                 rec.sl            = priv->broadcast->mcmember.sl;
 487                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 488                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 489         }
 490
 491         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 492         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 493                                          &rec, comp_mask, GFP_KERNEL,
 494                                          ipoib_mcast_join_complete, mcast);
 495         if (IS_ERR(mcast->mc)) {
 496                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 497                 ret = PTR_ERR(mcast->mc);
 498                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 499
 500                 mcast->backoff *= 2;
 501                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 502                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 503
 504                 mutex_lock(&mcast_mutex);
 505                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 506                         queue_delayed_work(ipoib_workqueue,
 507                                            &priv->mcast_task,
 508                                            mcast->backoff * HZ);
 509                 mutex_unlock(&mcast_mutex);
 510         }
 511 }
 512
 513 void ipoib_mcast_join_task(struct work_struct *work)
 514 {
 515         struct ipoib_dev_priv *priv =
 516                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 517         struct net_device *dev = priv->dev;
 518
 519         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 520                 return;
 521
 522         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 523                 ipoib_warn(priv, "ib_query_gid() failed\n");
 524         else
 525                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 526
 527         {
 528                 struct ib_port_attr attr;
 529
 530                 if (!ib_query_port(priv->ca, priv->port, &attr))
 531                         priv->local_lid = attr.lid;
 532                 else
 533                         ipoib_warn(priv, "ib_query_port failed\n");
 534         }
 535
 536         if (!priv->broadcast) {
 537                 struct ipoib_mcast *broadcast;
 538
 539                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 540                         return;
 541
 542                 broadcast = ipoib_mcast_alloc(dev, 1);
 543                 if (!broadcast) {
 544                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 545                         mutex_lock(&mcast_mutex);
 546                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 547                                 queue_delayed_work(ipoib_workqueue,
 548                                                    &priv->mcast_task, HZ);
 549                         mutex_unlock(&mcast_mutex);
 550                         return;
 551                 }
 552
 553                 spin_lock_irq(&priv->lock);
 554                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 555                        sizeof (union ib_gid));
 556                 priv->broadcast = broadcast;
 557
 558                 __ipoib_mcast_add(dev, priv->broadcast);
 559                 spin_unlock_irq(&priv->lock);
 560         }
 561
 562         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 563                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 564                         ipoib_mcast_join(dev, priv->broadcast, 0);
 565                 return;
 566         }
 567
 568         while (1) {
 569                 struct ipoib_mcast *mcast = NULL;
 570
 571                 spin_lock_irq(&priv->lock);
 572                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 573                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 574                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 575                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 576                                 /* Found the next unjoined group */
 577                                 break;
 578                         }
 579                 }
 580                 spin_unlock_irq(&priv->lock);
 581
 582                 if (&mcast->list == &priv->multicast_list) {
 583                         /* All done */
 584                         break;
 585                 }
 586
 587                 ipoib_mcast_join(dev, mcast, 1);
 588                 return;
 589         }
 590
 591         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 592
 593         if (!ipoib_cm_admin_enabled(dev)) {
 594                 rtnl_lock();
 595                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
 596                 rtnl_unlock();
 597         }
 598
 599         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 600
 601         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 602 }
 603
 604 int ipoib_mcast_start_thread(struct net_device *dev)
 605 {
 606         struct ipoib_dev_priv *priv = netdev_priv(dev);
 607
 608         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 609
 610         mutex_lock(&mcast_mutex);
 611         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 612                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 613         mutex_unlock(&mcast_mutex);
 614
 615         return 0;
 616 }
 617
 618 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 619 {
 620         struct ipoib_dev_priv *priv = netdev_priv(dev);
 621
 622         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 623
 624         mutex_lock(&mcast_mutex);
 625         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 626         cancel_delayed_work(&priv->mcast_task);
 627         mutex_unlock(&mcast_mutex);
 628
 629         if (flush)
 630                 flush_workqueue(ipoib_workqueue);
 631
 632         return 0;
 633 }
 634
 635 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 636 {
 637         struct ipoib_dev_priv *priv = netdev_priv(dev);
 638         int ret = 0;
 639
 640         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 641                 ib_sa_free_multicast(mcast->mc);
 642
 643         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 644                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 645                                 mcast->mcmember.mgid.raw);
 646
 647                 /* Remove ourselves from the multicast group */
 648                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 649                                       be16_to_cpu(mcast->mcmember.mlid));
 650                 if (ret)
 651                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 652         }
 653
 654         return 0;
 655 }
 656
 657 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 658 {
 659         struct ipoib_dev_priv *priv = netdev_priv(dev);
 660         struct ipoib_mcast *mcast;
 661         unsigned long flags;
 662
 663         spin_lock_irqsave(&priv->lock, flags);
 664
 665         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 666             !priv->broadcast                                    ||
 667             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 668                 ++dev->stats.tx_dropped;
 669                 dev_kfree_skb_any(skb);
 670                 goto unlock;
 671         }
 672
 673         mcast = __ipoib_mcast_find(dev, mgid);
 674         if (!mcast) {
 675                 /* Let's create a new send only group now */
 676                 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 677                                 mgid);
 678
 679                 mcast = ipoib_mcast_alloc(dev, 0);
 680                 if (!mcast) {
 681                         ipoib_warn(priv, "unable to allocate memory for "
 682                                    "multicast structure\n");
 683                         ++dev->stats.tx_dropped;
 684                         dev_kfree_skb_any(skb);
 685                         goto out;
 686                 }
 687
 688                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 689                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 690                 __ipoib_mcast_add(dev, mcast);
 691                 list_add_tail(&mcast->list, &priv->multicast_list);
 692         }
 693
 694         if (!mcast->ah) {
 695                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 696                         skb_queue_tail(&mcast->pkt_queue, skb);
 697                 else {
 698                         ++dev->stats.tx_dropped;
 699                         dev_kfree_skb_any(skb);
 700                 }
 701
 702                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 703                         ipoib_dbg_mcast(priv, "no address vector, "
 704                                         "but multicast join already started\n");
 705                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 706                         ipoib_mcast_sendonly_join(mcast);
 707
 708                 /*
 709                  * If lookup completes between here and out:, don't
 710                  * want to send packet twice.
 711                  */
 712                 mcast = NULL;
 713         }
 714
 715 out:
 716         if (mcast && mcast->ah) {
 717                 if (skb_dst(skb)                &&
 718                     skb_dst(skb)->neighbour &&
 719                     !*to_ipoib_neigh(skb_dst(skb)->neighbour)) {
 720                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb_dst(skb)->neighbour,
 721                                                                         skb->dev);
 722
 723                         if (neigh) {
 724                                 kref_get(&mcast->ah->ref);
 725                                 neigh->ah       = mcast->ah;
 726                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 727                         }
 728                 }
 729
 730                 spin_unlock_irqrestore(&priv->lock, flags);
 731                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 732                 return;
 733         }
 734
 735 unlock:
 736         spin_unlock_irqrestore(&priv->lock, flags);
 737 }
 738
 739 void ipoib_mcast_dev_flush(struct net_device *dev)
 740 {
 741         struct ipoib_dev_priv *priv = netdev_priv(dev);
 742         LIST_HEAD(remove_list);
 743         struct ipoib_mcast *mcast, *tmcast;
 744         unsigned long flags;
 745
 746         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 747
 748         spin_lock_irqsave(&priv->lock, flags);
 749
 750         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 751                 list_del(&mcast->list);
 752                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 753                 list_add_tail(&mcast->list, &remove_list);
 754         }
 755
 756         if (priv->broadcast) {
 757                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 758                 list_add_tail(&priv->broadcast->list, &remove_list);
 759                 priv->broadcast = NULL;
 760         }
 761
 762         spin_unlock_irqrestore(&priv->lock, flags);
 763
 764         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 765                 ipoib_mcast_leave(dev, mcast);
 766                 ipoib_mcast_free(mcast);
 767         }
 768 }
 769
 770 static int ipoib_mcast_addr_is_valid(const u8 *addr, unsigned int addrlen,
 771                                      const u8 *broadcast)
 772 {
 773         if (addrlen != INFINIBAND_ALEN)
 774                 return 0;
 775         /* reserved QPN, prefix, scope */
 776         if (memcmp(addr, broadcast, 6))
 777                 return 0;
 778         /* signature lower, pkey */
 779         if (memcmp(addr + 7, broadcast + 7, 3))
 780                 return 0;
 781         return 1;
 782 }
 783
 784 void ipoib_mcast_restart_task(struct work_struct *work)
 785 {
 786         struct ipoib_dev_priv *priv =
 787                 container_of(work, struct ipoib_dev_priv, restart_task);
 788         struct net_device *dev = priv->dev;
 789         struct dev_mc_list *mclist;
 790         struct ipoib_mcast *mcast, *tmcast;
 791         LIST_HEAD(remove_list);
 792         unsigned long flags;
 793         struct ib_sa_mcmember_rec rec;
 794
 795         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 796
 797         ipoib_mcast_stop_thread(dev, 0);
 798
 799         local_irq_save(flags);
 800         netif_addr_lock(dev);
 801         spin_lock(&priv->lock);
 802
 803         /*
 804          * Unfortunately, the networking core only gives us a list of all of
 805          * the multicast hardware addresses. We need to figure out which ones
 806          * are new and which ones have been removed
 807          */
 808
 809         /* Clear out the found flag */
 810         list_for_each_entry(mcast, &priv->multicast_list, list)
 811                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 812
 813         /* Mark all of the entries that are found or don't exist */
 814         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 815                 union ib_gid mgid;
 816
 817                 if (!ipoib_mcast_addr_is_valid(mclist->dmi_addr,
 818                                                mclist->dmi_addrlen,
 819                                                dev->broadcast))
 820                         continue;
 821
 822                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 823
 824                 mcast = __ipoib_mcast_find(dev, &mgid);
 825                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 826                         struct ipoib_mcast *nmcast;
 827
 828                         /* ignore group which is directly joined by userspace */
 829                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 830                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 831                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 832                                                 mgid.raw);
 833                                 continue;
 834                         }
 835
 836                         /* Not found or send-only group, let's add a new entry */
 837                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 838                                         mgid.raw);
 839
 840                         nmcast = ipoib_mcast_alloc(dev, 0);
 841                         if (!nmcast) {
 842                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 843                                 continue;
 844                         }
 845
 846                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 847
 848                         nmcast->mcmember.mgid = mgid;
 849
 850                         if (mcast) {
 851                                 /* Destroy the send only entry */
 852                                 list_move_tail(&mcast->list, &remove_list);
 853
 854                                 rb_replace_node(&mcast->rb_node,
 855                                                 &nmcast->rb_node,
 856                                                 &priv->multicast_tree);
 857                         } else
 858                                 __ipoib_mcast_add(dev, nmcast);
 859
 860                         list_add_tail(&nmcast->list, &priv->multicast_list);
 861                 }
 862
 863                 if (mcast)
 864                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 865         }
 866
 867         /* Remove all of the entries don't exist anymore */
 868         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 869                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 870                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 871                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 872                                         mcast->mcmember.mgid.raw);
 873
 874                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 875
 876                         /* Move to the remove list */
 877                         list_move_tail(&mcast->list, &remove_list);
 878                 }
 879         }
 880
 881         spin_unlock(&priv->lock);
 882         netif_addr_unlock(dev);
 883         local_irq_restore(flags);
 884
 885         /* We have to cancel outside of the spinlock */
 886         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 887                 ipoib_mcast_leave(mcast->dev, mcast);
 888                 ipoib_mcast_free(mcast);
 889         }
 890
 891         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 892                 ipoib_mcast_start_thread(dev);
 893 }
 894
 895 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 896
 897 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 898 {
 899         struct ipoib_mcast_iter *iter;
 900
 901         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 902         if (!iter)
 903                 return NULL;
 904
 905         iter->dev = dev;
 906         memset(iter->mgid.raw, 0, 16);
 907
 908         if (ipoib_mcast_iter_next(iter)) {
 909                 kfree(iter);
 910                 return NULL;
 911         }
 912
 913         return iter;
 914 }
 915
 916 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 917 {
 918         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 919         struct rb_node *n;
 920         struct ipoib_mcast *mcast;
 921         int ret = 1;
 922
 923         spin_lock_irq(&priv->lock);
 924
 925         n = rb_first(&priv->multicast_tree);
 926
 927         while (n) {
 928                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 929
 930                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 931                            sizeof (union ib_gid)) < 0) {
 932                         iter->mgid      = mcast->mcmember.mgid;
 933                         iter->created   = mcast->created;
 934                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 935                         iter->complete  = !!mcast->ah;
 936                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 937
 938                         ret = 0;
 939
 940                         break;
 941                 }
 942
 943                 n = rb_next(n);
 944         }
 945
 946         spin_unlock_irq(&priv->lock);
 947
 948         return ret;
 949 }
 950
 951 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 952                            union ib_gid *mgid,
 953                            unsigned long *created,
 954                            unsigned int *queuelen,
 955                            unsigned int *complete,
 956                            unsigned int *send_only)
 957 {
 958         *mgid      = iter->mgid;
 959         *created   = iter->created;
 960         *queuelen  = iter->queuelen;
 961         *complete  = iter->complete;
 962         *send_only = iter->send_only;
 963 }
 964
 965 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */