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 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 /*
  68  * This should be called with the priv->lock held
  69  */
  70 static void __ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv *priv,
  71                                                struct ipoib_mcast *mcast,
  72                                                bool delay)
  73 {
  74         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
  75                 return;
  76
  77         /*
  78          * We will be scheduling *something*, so cancel whatever is
  79          * currently scheduled first
  80          */
  81         cancel_delayed_work(&priv->mcast_task);
  82         if (mcast && delay) {
  83                 /*
  84                  * We had a failure and want to schedule a retry later
  85                  */
  86                 mcast->backoff *= 2;
  87                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
  88                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
  89                 mcast->delay_until = jiffies + (mcast->backoff * HZ);
  90                 /*
  91                  * Mark this mcast for its delay, but restart the
  92                  * task immediately.  The join task will make sure to
  93                  * clear out all entries without delays, and then
  94                  * schedule itself to run again when the earliest
  95                  * delay expires
  96                  */
  97                 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
  98         } else if (delay) {
  99                 /*
 100                  * Special case of retrying after a failure to
 101                  * allocate the broadcast multicast group, wait
 102                  * 1 second and try again
 103                  */
 104                 queue_delayed_work(priv->wq, &priv->mcast_task, HZ);
 105         } else
 106                 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
 107 }
 108
 109 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
 110 {
 111         struct net_device *dev = mcast->dev;
 112         int tx_dropped = 0;
 113
 114         ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
 115                         mcast->mcmember.mgid.raw);
 116
 117         /* remove all neigh connected to this mcast */
 118         ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw);
 119
 120         if (mcast->ah)
 121                 ipoib_put_ah(mcast->ah);
 122
 123         while (!skb_queue_empty(&mcast->pkt_queue)) {
 124                 ++tx_dropped;
 125                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 126         }
 127
 128         netif_tx_lock_bh(dev);
 129         dev->stats.tx_dropped += tx_dropped;
 130         netif_tx_unlock_bh(dev);
 131
 132         kfree(mcast);
 133 }
 134
 135 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 136                                              int can_sleep)
 137 {
 138         struct ipoib_mcast *mcast;
 139
 140         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 141         if (!mcast)
 142                 return NULL;
 143
 144         mcast->dev = dev;
 145         mcast->created = jiffies;
 146         mcast->delay_until = jiffies;
 147         mcast->backoff = 1;
 148
 149         INIT_LIST_HEAD(&mcast->list);
 150         INIT_LIST_HEAD(&mcast->neigh_list);
 151         skb_queue_head_init(&mcast->pkt_queue);
 152
 153         return mcast;
 154 }
 155
 156 struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 157 {
 158         struct ipoib_dev_priv *priv = netdev_priv(dev);
 159         struct rb_node *n = priv->multicast_tree.rb_node;
 160
 161         while (n) {
 162                 struct ipoib_mcast *mcast;
 163                 int ret;
 164
 165                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 166
 167                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 168                              sizeof (union ib_gid));
 169                 if (ret < 0)
 170                         n = n->rb_left;
 171                 else if (ret > 0)
 172                         n = n->rb_right;
 173                 else
 174                         return mcast;
 175         }
 176
 177         return NULL;
 178 }
 179
 180 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 181 {
 182         struct ipoib_dev_priv *priv = netdev_priv(dev);
 183         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 184
 185         while (*n) {
 186                 struct ipoib_mcast *tmcast;
 187                 int ret;
 188
 189                 pn = *n;
 190                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 191
 192                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 193                              sizeof (union ib_gid));
 194                 if (ret < 0)
 195                         n = &pn->rb_left;
 196                 else if (ret > 0)
 197                         n = &pn->rb_right;
 198                 else
 199                         return -EEXIST;
 200         }
 201
 202         rb_link_node(&mcast->rb_node, pn, n);
 203         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 204
 205         return 0;
 206 }
 207
 208 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 209                                    struct ib_sa_mcmember_rec *mcmember)
 210 {
 211         struct net_device *dev = mcast->dev;
 212         struct ipoib_dev_priv *priv = netdev_priv(dev);
 213         struct ipoib_ah *ah;
 214         int ret;
 215         int set_qkey = 0;
 216
 217         mcast->mcmember = *mcmember;
 218
 219         /* Set the multicast MTU and cached Q_Key before we attach if it's
 220          * the broadcast group.
 221          */
 222         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 223                     sizeof (union ib_gid))) {
 224                 spin_lock_irq(&priv->lock);
 225                 if (!priv->broadcast) {
 226                         spin_unlock_irq(&priv->lock);
 227                         return -EAGAIN;
 228                 }
 229                 /*update priv member according to the new mcast*/
 230                 priv->broadcast->mcmember.qkey = mcmember->qkey;
 231                 priv->broadcast->mcmember.mtu = mcmember->mtu;
 232                 priv->broadcast->mcmember.traffic_class = mcmember->traffic_class;
 233                 priv->broadcast->mcmember.rate = mcmember->rate;
 234                 priv->broadcast->mcmember.sl = mcmember->sl;
 235                 priv->broadcast->mcmember.flow_label = mcmember->flow_label;
 236                 priv->broadcast->mcmember.hop_limit = mcmember->hop_limit;
 237                 /* assume if the admin and the mcast are the same both can be changed */
 238                 if (priv->mcast_mtu == priv->admin_mtu)
 239                         priv->admin_mtu =
 240                         priv->mcast_mtu =
 241                         IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 242                 else
 243                         priv->mcast_mtu =
 244                         IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 245
 246                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 247                 spin_unlock_irq(&priv->lock);
 248                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 249                 set_qkey = 1;
 250         }
 251
 252         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 253                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 254                         ipoib_warn(priv, "multicast group %pI6 already attached\n",
 255                                    mcast->mcmember.mgid.raw);
 256
 257                         return 0;
 258                 }
 259
 260                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 261                                          &mcast->mcmember.mgid, set_qkey);
 262                 if (ret < 0) {
 263                         ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
 264                                    mcast->mcmember.mgid.raw);
 265
 266                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 267                         return ret;
 268                 }
 269         }
 270
 271         {
 272                 struct ib_ah_attr av = {
 273                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 274                         .port_num      = priv->port,
 275                         .sl            = mcast->mcmember.sl,
 276                         .ah_flags      = IB_AH_GRH,
 277                         .static_rate   = mcast->mcmember.rate,
 278                         .grh           = {
 279                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 280                                 .hop_limit     = mcast->mcmember.hop_limit,
 281                                 .sgid_index    = 0,
 282                                 .traffic_class = mcast->mcmember.traffic_class
 283                         }
 284                 };
 285                 av.grh.dgid = mcast->mcmember.mgid;
 286
 287                 ah = ipoib_create_ah(dev, priv->pd, &av);
 288                 if (IS_ERR(ah)) {
 289                         ipoib_warn(priv, "ib_address_create failed %ld\n",
 290                                 -PTR_ERR(ah));
 291                         /* use original error */
 292                         return PTR_ERR(ah);
 293                 } else {
 294                         spin_lock_irq(&priv->lock);
 295                         mcast->ah = ah;
 296                         spin_unlock_irq(&priv->lock);
 297
 298                         ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
 299                                         mcast->mcmember.mgid.raw,
 300                                         mcast->ah->ah,
 301                                         be16_to_cpu(mcast->mcmember.mlid),
 302                                         mcast->mcmember.sl);
 303                 }
 304         }
 305
 306         /* actually send any queued packets */
 307         netif_tx_lock_bh(dev);
 308         while (!skb_queue_empty(&mcast->pkt_queue)) {
 309                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 310
 311                 netif_tx_unlock_bh(dev);
 312
 313                 skb->dev = dev;
 314                 if (dev_queue_xmit(skb))
 315                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 316
 317                 netif_tx_lock_bh(dev);
 318         }
 319         netif_tx_unlock_bh(dev);
 320
 321         return 0;
 322 }
 323
 324 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 325 {
 326         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 327                                                    carrier_on_task);
 328         struct ib_port_attr attr;
 329
 330         if (ib_query_port(priv->ca, priv->port, &attr) ||
 331             attr.state != IB_PORT_ACTIVE) {
 332                 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
 333                 return;
 334         }
 335
 336         /*
 337          * Take rtnl_lock to avoid racing with ipoib_stop() and
 338          * turning the carrier back on while a device is being
 339          * removed.  However, ipoib_stop() will attempt to flush
 340          * the workqueue while holding the rtnl lock, so loop
 341          * on trylock until either we get the lock or we see
 342          * FLAG_OPER_UP go away as that signals that we are bailing
 343          * and can safely ignore the carrier on work.
 344          */
 345         while (!rtnl_trylock()) {
 346                 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 347                         return;
 348                 else
 349                         msleep(20);
 350         }
 351         if (!ipoib_cm_admin_enabled(priv->dev))
 352                 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
 353         netif_carrier_on(priv->dev);
 354         rtnl_unlock();
 355 }
 356
 357 static int ipoib_mcast_join_complete(int status,
 358                                      struct ib_sa_multicast *multicast)
 359 {
 360         struct ipoib_mcast *mcast = multicast->context;
 361         struct net_device *dev = mcast->dev;
 362         struct ipoib_dev_priv *priv = netdev_priv(dev);
 363
 364         ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",
 365                         test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?
 366                         "sendonly " : "",
 367                         mcast->mcmember.mgid.raw, status);
 368
 369         /* We trap for port events ourselves. */
 370         if (status == -ENETRESET) {
 371                 status = 0;
 372                 goto out;
 373         }
 374
 375         if (!status)
 376                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 377
 378         if (!status) {
 379                 mcast->backoff = 1;
 380                 mcast->delay_until = jiffies;
 381
 382                 /*
 383                  * Defer carrier on work to priv->wq to avoid a
 384                  * deadlock on rtnl_lock here.  Requeue our multicast
 385                  * work too, which will end up happening right after
 386                  * our carrier on task work and will allow us to
 387                  * send out all of the non-broadcast joins
 388                  */
 389                 if (mcast == priv->broadcast) {
 390                         spin_lock_irq(&priv->lock);
 391                         queue_work(priv->wq, &priv->carrier_on_task);
 392                         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 393                         goto out_locked;
 394                 }
 395         } else {
 396                 bool silent_fail =
 397                     test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
 398                     status == -EINVAL;
 399
 400                 if (mcast->logcount < 20) {
 401                         if (status == -ETIMEDOUT || status == -EAGAIN ||
 402                             silent_fail) {
 403                                 ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
 404                                                 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
 405                                                 mcast->mcmember.mgid.raw, status);
 406                         } else {
 407                                 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
 408                                                 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
 409                                            mcast->mcmember.mgid.raw, status);
 410                         }
 411
 412                         if (!silent_fail)
 413                                 mcast->logcount++;
 414                 }
 415
 416                 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
 417                     mcast->backoff >= 2) {
 418                         /*
 419                          * We only retry sendonly joins once before we drop
 420                          * the packet and quit trying to deal with the
 421                          * group.  However, we leave the group in the
 422                          * mcast list as an unjoined group.  If we want to
 423                          * try joining again, we simply queue up a packet
 424                          * and restart the join thread.  The empty queue
 425                          * is why the join thread ignores this group.
 426                          */
 427                         mcast->backoff = 1;
 428                         netif_tx_lock_bh(dev);
 429                         while (!skb_queue_empty(&mcast->pkt_queue)) {
 430                                 ++dev->stats.tx_dropped;
 431                                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 432                         }
 433                         netif_tx_unlock_bh(dev);
 434                 } else {
 435                         spin_lock_irq(&priv->lock);
 436                         /* Requeue this join task with a backoff delay */
 437                         __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
 438                         goto out_locked;
 439                 }
 440         }
 441 out:
 442         spin_lock_irq(&priv->lock);
 443 out_locked:
 444         /*
 445          * Make sure to set mcast->mc before we clear the busy flag to avoid
 446          * racing with code that checks for BUSY before checking mcast->mc
 447          */
 448         if (status)
 449                 mcast->mc = NULL;
 450         else
 451                 mcast->mc = multicast;
 452         clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 453         spin_unlock_irq(&priv->lock);
 454         complete(&mcast->done);
 455
 456         return status;
 457 }
 458
 459 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
 460 {
 461         struct ipoib_dev_priv *priv = netdev_priv(dev);
 462         struct ib_sa_multicast *multicast;
 463         struct ib_sa_mcmember_rec rec = {
 464                 .join_state = 1
 465         };
 466         ib_sa_comp_mask comp_mask;
 467         int ret = 0;
 468
 469         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 470
 471         rec.mgid     = mcast->mcmember.mgid;
 472         rec.port_gid = priv->local_gid;
 473         rec.pkey     = cpu_to_be16(priv->pkey);
 474
 475         comp_mask =
 476                 IB_SA_MCMEMBER_REC_MGID         |
 477                 IB_SA_MCMEMBER_REC_PORT_GID     |
 478                 IB_SA_MCMEMBER_REC_PKEY         |
 479                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 480
 481         if (mcast != priv->broadcast) {
 482                 /*
 483                  * RFC 4391:
 484                  *  The MGID MUST use the same P_Key, Q_Key, SL, MTU,
 485                  *  and HopLimit as those used in the broadcast-GID.  The rest
 486                  *  of attributes SHOULD follow the values used in the
 487                  *  broadcast-GID as well.
 488                  */
 489                 comp_mask |=
 490                         IB_SA_MCMEMBER_REC_QKEY                 |
 491                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 492                         IB_SA_MCMEMBER_REC_MTU                  |
 493                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 494                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 495                         IB_SA_MCMEMBER_REC_RATE                 |
 496                         IB_SA_MCMEMBER_REC_SL                   |
 497                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 498                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 499
 500                 rec.qkey          = priv->broadcast->mcmember.qkey;
 501                 rec.mtu_selector  = IB_SA_EQ;
 502                 rec.mtu           = priv->broadcast->mcmember.mtu;
 503                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 504                 rec.rate_selector = IB_SA_EQ;
 505                 rec.rate          = priv->broadcast->mcmember.rate;
 506                 rec.sl            = priv->broadcast->mcmember.sl;
 507                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 508                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 509
 510                 /*
 511                  * Send-only IB Multicast joins do not work at the core
 512                  * IB layer yet, so we can't use them here.  However,
 513                  * we are emulating an Ethernet multicast send, which
 514                  * does not require a multicast subscription and will
 515                  * still send properly.  The most appropriate thing to
 516                  * do is to create the group if it doesn't exist as that
 517                  * most closely emulates the behavior, from a user space
 518                  * application perspecitive, of Ethernet multicast
 519                  * operation.  For now, we do a full join, maybe later
 520                  * when the core IB layers support send only joins we
 521                  * will use them.
 522                  */
 523 #if 0
 524                 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 525                         rec.join_state = 4;
 526 #endif
 527         }
 528
 529         multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 530                                          &rec, comp_mask, GFP_KERNEL,
 531                                          ipoib_mcast_join_complete, mcast);
 532         if (IS_ERR(multicast)) {
 533                 ret = PTR_ERR(multicast);
 534                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 535                 spin_lock_irq(&priv->lock);
 536                 /* Requeue this join task with a backoff delay */
 537                 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
 538                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 539                 spin_unlock_irq(&priv->lock);
 540                 complete(&mcast->done);
 541         }
 542 }
 543
 544 void ipoib_mcast_join_task(struct work_struct *work)
 545 {
 546         struct ipoib_dev_priv *priv =
 547                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 548         struct net_device *dev = priv->dev;
 549         struct ib_port_attr port_attr;
 550         unsigned long delay_until = 0;
 551         struct ipoib_mcast *mcast = NULL;
 552
 553         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 554                 return;
 555
 556         if (ib_query_port(priv->ca, priv->port, &port_attr) ||
 557             port_attr.state != IB_PORT_ACTIVE) {
 558                 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
 559                           port_attr.state);
 560                 return;
 561         }
 562         priv->local_lid = port_attr.lid;
 563
 564         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 565                 ipoib_warn(priv, "ib_query_gid() failed\n");
 566         else
 567                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 568
 569         spin_lock_irq(&priv->lock);
 570         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 571                 goto out;
 572
 573         if (!priv->broadcast) {
 574                 struct ipoib_mcast *broadcast;
 575
 576                 broadcast = ipoib_mcast_alloc(dev, 0);
 577                 if (!broadcast) {
 578                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 579                         /*
 580                          * Restart us after a 1 second delay to retry
 581                          * creating our broadcast group and attaching to
 582                          * it.  Until this succeeds, this ipoib dev is
 583                          * completely stalled (multicast wise).
 584                          */
 585                         __ipoib_mcast_schedule_join_thread(priv, NULL, 1);
 586                         goto out;
 587                 }
 588
 589                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 590                        sizeof (union ib_gid));
 591                 priv->broadcast = broadcast;
 592
 593                 __ipoib_mcast_add(dev, priv->broadcast);
 594         }
 595
 596         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 597                 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
 598                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
 599                         mcast = priv->broadcast;
 600                         if (mcast->backoff > 1 &&
 601                             time_before(jiffies, mcast->delay_until)) {
 602                                 delay_until = mcast->delay_until;
 603                                 mcast = NULL;
 604                         }
 605                 }
 606                 goto out;
 607         }
 608
 609         /*
 610          * We'll never get here until the broadcast group is both allocated
 611          * and attached
 612          */
 613         list_for_each_entry(mcast, &priv->multicast_list, list) {
 614                 if (IS_ERR_OR_NULL(mcast->mc) &&
 615                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
 616                     (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
 617                      !skb_queue_empty(&mcast->pkt_queue))) {
 618                         if (mcast->backoff == 1 ||
 619                             time_after_eq(jiffies, mcast->delay_until)) {
 620                                 /* Found the next unjoined group */
 621                                 init_completion(&mcast->done);
 622                                 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 623                                 spin_unlock_irq(&priv->lock);
 624                                 ipoib_mcast_join(dev, mcast);
 625                                 spin_lock_irq(&priv->lock);
 626                         } else if (!delay_until ||
 627                                  time_before(mcast->delay_until, delay_until))
 628                                 delay_until = mcast->delay_until;
 629                 }
 630         }
 631
 632         mcast = NULL;
 633         ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
 634
 635 out:
 636         if (delay_until) {
 637                 cancel_delayed_work(&priv->mcast_task);
 638                 queue_delayed_work(priv->wq, &priv->mcast_task,
 639                                    delay_until - jiffies);
 640         }
 641         if (mcast) {
 642                 init_completion(&mcast->done);
 643                 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 644         }
 645         spin_unlock_irq(&priv->lock);
 646         if (mcast)
 647                 ipoib_mcast_join(dev, mcast);
 648 }
 649
 650 int ipoib_mcast_start_thread(struct net_device *dev)
 651 {
 652         struct ipoib_dev_priv *priv = netdev_priv(dev);
 653         unsigned long flags;
 654
 655         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 656
 657         spin_lock_irqsave(&priv->lock, flags);
 658         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 659         spin_unlock_irqrestore(&priv->lock, flags);
 660
 661         return 0;
 662 }
 663
 664 int ipoib_mcast_stop_thread(struct net_device *dev)
 665 {
 666         struct ipoib_dev_priv *priv = netdev_priv(dev);
 667         unsigned long flags;
 668
 669         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 670
 671         spin_lock_irqsave(&priv->lock, flags);
 672         cancel_delayed_work(&priv->mcast_task);
 673         spin_unlock_irqrestore(&priv->lock, flags);
 674
 675         flush_workqueue(priv->wq);
 676
 677         return 0;
 678 }
 679
 680 int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 681 {
 682         struct ipoib_dev_priv *priv = netdev_priv(dev);
 683         int ret = 0;
 684
 685         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 686                 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
 687
 688         if (!IS_ERR_OR_NULL(mcast->mc))
 689                 ib_sa_free_multicast(mcast->mc);
 690
 691         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 692                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 693                                 mcast->mcmember.mgid.raw);
 694
 695                 /* Remove ourselves from the multicast group */
 696                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 697                                       be16_to_cpu(mcast->mcmember.mlid));
 698                 if (ret)
 699                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 700         } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 701                 ipoib_dbg(priv, "leaving with no mcmember but not a "
 702                           "SENDONLY join\n");
 703
 704         return 0;
 705 }
 706
 707 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
 708 {
 709         struct ipoib_dev_priv *priv = netdev_priv(dev);
 710         struct ipoib_mcast *mcast;
 711         unsigned long flags;
 712         void *mgid = daddr + 4;
 713
 714         spin_lock_irqsave(&priv->lock, flags);
 715
 716         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 717             !priv->broadcast                                    ||
 718             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 719                 ++dev->stats.tx_dropped;
 720                 dev_kfree_skb_any(skb);
 721                 goto unlock;
 722         }
 723
 724         mcast = __ipoib_mcast_find(dev, mgid);
 725         if (!mcast || !mcast->ah) {
 726                 if (!mcast) {
 727                         /* Let's create a new send only group now */
 728                         ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 729                                         mgid);
 730
 731                         mcast = ipoib_mcast_alloc(dev, 0);
 732                         if (!mcast) {
 733                                 ipoib_warn(priv, "unable to allocate memory "
 734                                            "for multicast structure\n");
 735                                 ++dev->stats.tx_dropped;
 736                                 dev_kfree_skb_any(skb);
 737                                 goto unlock;
 738                         }
 739
 740                         set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 741                         memcpy(mcast->mcmember.mgid.raw, mgid,
 742                                sizeof (union ib_gid));
 743                         __ipoib_mcast_add(dev, mcast);
 744                         list_add_tail(&mcast->list, &priv->multicast_list);
 745                 }
 746                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 747                         skb_queue_tail(&mcast->pkt_queue, skb);
 748                 else {
 749                         ++dev->stats.tx_dropped;
 750                         dev_kfree_skb_any(skb);
 751                 }
 752                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 753                         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 754                 }
 755         } else {
 756                 struct ipoib_neigh *neigh;
 757
 758                 spin_unlock_irqrestore(&priv->lock, flags);
 759                 neigh = ipoib_neigh_get(dev, daddr);
 760                 spin_lock_irqsave(&priv->lock, flags);
 761                 if (!neigh) {
 762                         neigh = ipoib_neigh_alloc(daddr, dev);
 763                         if (neigh) {
 764                                 kref_get(&mcast->ah->ref);
 765                                 neigh->ah       = mcast->ah;
 766                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 767                         }
 768                 }
 769                 spin_unlock_irqrestore(&priv->lock, flags);
 770                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 771                 if (neigh)
 772                         ipoib_neigh_put(neigh);
 773                 return;
 774         }
 775
 776 unlock:
 777         spin_unlock_irqrestore(&priv->lock, flags);
 778 }
 779
 780 void ipoib_mcast_dev_flush(struct net_device *dev)
 781 {
 782         struct ipoib_dev_priv *priv = netdev_priv(dev);
 783         LIST_HEAD(remove_list);
 784         struct ipoib_mcast *mcast, *tmcast;
 785         unsigned long flags;
 786
 787         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 788
 789         spin_lock_irqsave(&priv->lock, flags);
 790
 791         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 792                 list_del(&mcast->list);
 793                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 794                 list_add_tail(&mcast->list, &remove_list);
 795         }
 796
 797         if (priv->broadcast) {
 798                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 799                 list_add_tail(&priv->broadcast->list, &remove_list);
 800                 priv->broadcast = NULL;
 801         }
 802
 803         spin_unlock_irqrestore(&priv->lock, flags);
 804
 805         /*
 806          * make sure the in-flight joins have finished before we attempt
 807          * to leave
 808          */
 809         list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
 810                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 811                         wait_for_completion(&mcast->done);
 812
 813         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 814                 ipoib_mcast_leave(dev, mcast);
 815                 ipoib_mcast_free(mcast);
 816         }
 817 }
 818
 819 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
 820 {
 821         /* reserved QPN, prefix, scope */
 822         if (memcmp(addr, broadcast, 6))
 823                 return 0;
 824         /* signature lower, pkey */
 825         if (memcmp(addr + 7, broadcast + 7, 3))
 826                 return 0;
 827         return 1;
 828 }
 829
 830 void ipoib_mcast_restart_task(struct work_struct *work)
 831 {
 832         struct ipoib_dev_priv *priv =
 833                 container_of(work, struct ipoib_dev_priv, restart_task);
 834         struct net_device *dev = priv->dev;
 835         struct netdev_hw_addr *ha;
 836         struct ipoib_mcast *mcast, *tmcast;
 837         LIST_HEAD(remove_list);
 838         unsigned long flags;
 839         struct ib_sa_mcmember_rec rec;
 840
 841         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 842                 /*
 843                  * shortcut...on shutdown flush is called next, just
 844                  * let it do all the work
 845                  */
 846                 return;
 847
 848         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 849
 850         local_irq_save(flags);
 851         netif_addr_lock(dev);
 852         spin_lock(&priv->lock);
 853
 854         /*
 855          * Unfortunately, the networking core only gives us a list of all of
 856          * the multicast hardware addresses. We need to figure out which ones
 857          * are new and which ones have been removed
 858          */
 859
 860         /* Clear out the found flag */
 861         list_for_each_entry(mcast, &priv->multicast_list, list)
 862                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 863
 864         /* Mark all of the entries that are found or don't exist */
 865         netdev_for_each_mc_addr(ha, dev) {
 866                 union ib_gid mgid;
 867
 868                 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
 869                         continue;
 870
 871                 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
 872
 873                 mcast = __ipoib_mcast_find(dev, &mgid);
 874                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 875                         struct ipoib_mcast *nmcast;
 876
 877                         /* ignore group which is directly joined by userspace */
 878                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 879                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 880                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 881                                                 mgid.raw);
 882                                 continue;
 883                         }
 884
 885                         /* Not found or send-only group, let's add a new entry */
 886                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 887                                         mgid.raw);
 888
 889                         nmcast = ipoib_mcast_alloc(dev, 0);
 890                         if (!nmcast) {
 891                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 892                                 continue;
 893                         }
 894
 895                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 896
 897                         nmcast->mcmember.mgid = mgid;
 898
 899                         if (mcast) {
 900                                 /* Destroy the send only entry */
 901                                 list_move_tail(&mcast->list, &remove_list);
 902
 903                                 rb_replace_node(&mcast->rb_node,
 904                                                 &nmcast->rb_node,
 905                                                 &priv->multicast_tree);
 906                         } else
 907                                 __ipoib_mcast_add(dev, nmcast);
 908
 909                         list_add_tail(&nmcast->list, &priv->multicast_list);
 910                 }
 911
 912                 if (mcast)
 913                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 914         }
 915
 916         /* Remove all of the entries don't exist anymore */
 917         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 918                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 919                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 920                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 921                                         mcast->mcmember.mgid.raw);
 922
 923                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 924
 925                         /* Move to the remove list */
 926                         list_move_tail(&mcast->list, &remove_list);
 927                 }
 928         }
 929
 930         spin_unlock(&priv->lock);
 931         netif_addr_unlock(dev);
 932         local_irq_restore(flags);
 933
 934         /*
 935          * make sure the in-flight joins have finished before we attempt
 936          * to leave
 937          */
 938         list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
 939                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 940                         wait_for_completion(&mcast->done);
 941
 942         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 943                 ipoib_mcast_leave(mcast->dev, mcast);
 944                 ipoib_mcast_free(mcast);
 945         }
 946
 947         /*
 948          * Double check that we are still up
 949          */
 950         if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 951                 spin_lock_irqsave(&priv->lock, flags);
 952                 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 953                 spin_unlock_irqrestore(&priv->lock, flags);
 954         }
 955 }
 956
 957 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 958
 959 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 960 {
 961         struct ipoib_mcast_iter *iter;
 962
 963         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 964         if (!iter)
 965                 return NULL;
 966
 967         iter->dev = dev;
 968         memset(iter->mgid.raw, 0, 16);
 969
 970         if (ipoib_mcast_iter_next(iter)) {
 971                 kfree(iter);
 972                 return NULL;
 973         }
 974
 975         return iter;
 976 }
 977
 978 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 979 {
 980         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 981         struct rb_node *n;
 982         struct ipoib_mcast *mcast;
 983         int ret = 1;
 984
 985         spin_lock_irq(&priv->lock);
 986
 987         n = rb_first(&priv->multicast_tree);
 988
 989         while (n) {
 990                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 991
 992                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 993                            sizeof (union ib_gid)) < 0) {
 994                         iter->mgid      = mcast->mcmember.mgid;
 995                         iter->created   = mcast->created;
 996                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 997                         iter->complete  = !!mcast->ah;
 998                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 999
1000                         ret = 0;
1001
1002                         break;
1003                 }
1004
1005                 n = rb_next(n);
1006         }
1007
1008         spin_unlock_irq(&priv->lock);
1009
1010         return ret;
1011 }
1012
1013 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1014                            union ib_gid *mgid,
1015                            unsigned long *created,
1016                            unsigned int *queuelen,
1017                            unsigned int *complete,
1018                            unsigned int *send_only)
1019 {
1020         *mgid      = iter->mgid;
1021         *created   = iter->created;
1022         *queuelen  = iter->queuelen;
1023         *complete  = iter->complete;
1024         *send_only = iter->send_only;
1025 }
1026
1027 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */