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 /* join state that allows creating mcg with sendonly member request */
  68 #define SENDONLY_FULLMEMBER_JOIN        8
  69
  70 /*
  71  * This should be called with the priv->lock held
  72  */
  73 static void __ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv *priv,
  74                                                struct ipoib_mcast *mcast,
  75                                                bool delay)
  76 {
  77         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
  78                 return;
  79
  80         /*
  81          * We will be scheduling *something*, so cancel whatever is
  82          * currently scheduled first
  83          */
  84         cancel_delayed_work(&priv->mcast_task);
  85         if (mcast && delay) {
  86                 /*
  87                  * We had a failure and want to schedule a retry later
  88                  */
  89                 mcast->backoff *= 2;
  90                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
  91                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
  92                 mcast->delay_until = jiffies + (mcast->backoff * HZ);
  93                 /*
  94                  * Mark this mcast for its delay, but restart the
  95                  * task immediately.  The join task will make sure to
  96                  * clear out all entries without delays, and then
  97                  * schedule itself to run again when the earliest
  98                  * delay expires
  99                  */
 100                 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
 101         } else if (delay) {
 102                 /*
 103                  * Special case of retrying after a failure to
 104                  * allocate the broadcast multicast group, wait
 105                  * 1 second and try again
 106                  */
 107                 queue_delayed_work(priv->wq, &priv->mcast_task, HZ);
 108         } else
 109                 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
 110 }
 111
 112 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
 113 {
 114         struct net_device *dev = mcast->dev;
 115         int tx_dropped = 0;
 116
 117         ipoib_dbg_mcast(ipoib_priv(dev), "deleting multicast group %pI6\n",
 118                         mcast->mcmember.mgid.raw);
 119
 120         /* remove all neigh connected to this mcast */
 121         ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw);
 122
 123         if (mcast->ah)
 124                 ipoib_put_ah(mcast->ah);
 125
 126         while (!skb_queue_empty(&mcast->pkt_queue)) {
 127                 ++tx_dropped;
 128                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 129         }
 130
 131         netif_tx_lock_bh(dev);
 132         dev->stats.tx_dropped += tx_dropped;
 133         netif_tx_unlock_bh(dev);
 134
 135         kfree(mcast);
 136 }
 137
 138 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev)
 139 {
 140         struct ipoib_mcast *mcast;
 141
 142         mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC);
 143         if (!mcast)
 144                 return NULL;
 145
 146         mcast->dev = dev;
 147         mcast->created = jiffies;
 148         mcast->delay_until = jiffies;
 149         mcast->backoff = 1;
 150
 151         INIT_LIST_HEAD(&mcast->list);
 152         INIT_LIST_HEAD(&mcast->neigh_list);
 153         skb_queue_head_init(&mcast->pkt_queue);
 154
 155         return mcast;
 156 }
 157
 158 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 159 {
 160         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 161         struct rb_node *n = priv->multicast_tree.rb_node;
 162
 163         while (n) {
 164                 struct ipoib_mcast *mcast;
 165                 int ret;
 166
 167                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 168
 169                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 170                              sizeof (union ib_gid));
 171                 if (ret < 0)
 172                         n = n->rb_left;
 173                 else if (ret > 0)
 174                         n = n->rb_right;
 175                 else
 176                         return mcast;
 177         }
 178
 179         return NULL;
 180 }
 181
 182 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 183 {
 184         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 185         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 186
 187         while (*n) {
 188                 struct ipoib_mcast *tmcast;
 189                 int ret;
 190
 191                 pn = *n;
 192                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 193
 194                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 195                              sizeof (union ib_gid));
 196                 if (ret < 0)
 197                         n = &pn->rb_left;
 198                 else if (ret > 0)
 199                         n = &pn->rb_right;
 200                 else
 201                         return -EEXIST;
 202         }
 203
 204         rb_link_node(&mcast->rb_node, pn, n);
 205         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 206
 207         return 0;
 208 }
 209
 210 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 211                                    struct ib_sa_mcmember_rec *mcmember)
 212 {
 213         struct net_device *dev = mcast->dev;
 214         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 215         struct rdma_netdev *rn = netdev_priv(dev);
 216         struct ipoib_ah *ah;
 217         struct rdma_ah_attr av;
 218         int ret;
 219         int set_qkey = 0;
 220         int mtu;
 221
 222         mcast->mcmember = *mcmember;
 223
 224         /* Set the multicast MTU and cached Q_Key before we attach if it's
 225          * the broadcast group.
 226          */
 227         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 228                     sizeof (union ib_gid))) {
 229                 spin_lock_irq(&priv->lock);
 230                 if (!priv->broadcast) {
 231                         spin_unlock_irq(&priv->lock);
 232                         return -EAGAIN;
 233                 }
 234                 /*update priv member according to the new mcast*/
 235                 priv->broadcast->mcmember.qkey = mcmember->qkey;
 236                 priv->broadcast->mcmember.mtu = mcmember->mtu;
 237                 priv->broadcast->mcmember.traffic_class = mcmember->traffic_class;
 238                 priv->broadcast->mcmember.rate = mcmember->rate;
 239                 priv->broadcast->mcmember.sl = mcmember->sl;
 240                 priv->broadcast->mcmember.flow_label = mcmember->flow_label;
 241                 priv->broadcast->mcmember.hop_limit = mcmember->hop_limit;
 242                 /* assume if the admin and the mcast are the same both can be changed */
 243                 mtu = rdma_mtu_enum_to_int(priv->ca,  priv->port,
 244                                            priv->broadcast->mcmember.mtu);
 245                 if (priv->mcast_mtu == priv->admin_mtu)
 246                         priv->admin_mtu = IPOIB_UD_MTU(mtu);
 247                 priv->mcast_mtu = IPOIB_UD_MTU(mtu);
 248                 rn->mtu = priv->mcast_mtu;
 249
 250                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 251                 spin_unlock_irq(&priv->lock);
 252                 priv->tx_wr.remote_qkey = priv->qkey;
 253                 set_qkey = 1;
 254         }
 255
 256         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 257                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 258                         ipoib_warn(priv, "multicast group %pI6 already attached\n",
 259                                    mcast->mcmember.mgid.raw);
 260
 261                         return 0;
 262                 }
 263
 264                 ret = rn->attach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
 265                                        be16_to_cpu(mcast->mcmember.mlid),
 266                                        set_qkey, priv->qkey);
 267                 if (ret < 0) {
 268                         ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
 269                                    mcast->mcmember.mgid.raw);
 270
 271                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 272                         return ret;
 273                 }
 274         }
 275
 276         memset(&av, 0, sizeof(av));
 277         av.type = rdma_ah_find_type(priv->ca, priv->port);
 278         rdma_ah_set_dlid(&av, be16_to_cpu(mcast->mcmember.mlid));
 279         rdma_ah_set_port_num(&av, priv->port);
 280         rdma_ah_set_sl(&av, mcast->mcmember.sl);
 281         rdma_ah_set_static_rate(&av, mcast->mcmember.rate);
 282
 283         rdma_ah_set_grh(&av, &mcast->mcmember.mgid,
 284                         be32_to_cpu(mcast->mcmember.flow_label),
 285                         0, mcast->mcmember.hop_limit,
 286                         mcast->mcmember.traffic_class);
 287
 288         ah = ipoib_create_ah(dev, priv->pd, &av);
 289         if (IS_ERR(ah)) {
 290                 ipoib_warn(priv, "ib_address_create failed %ld\n",
 291                            -PTR_ERR(ah));
 292                 /* use original error */
 293                 return PTR_ERR(ah);
 294         }
 295         spin_lock_irq(&priv->lock);
 296         mcast->ah = ah;
 297         spin_unlock_irq(&priv->lock);
 298
 299         ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
 300                         mcast->mcmember.mgid.raw,
 301                         mcast->ah->ah,
 302                         be16_to_cpu(mcast->mcmember.mlid),
 303                         mcast->mcmember.sl);
 304
 305         /* actually send any queued packets */
 306         netif_tx_lock_bh(dev);
 307         while (!skb_queue_empty(&mcast->pkt_queue)) {
 308                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 309
 310                 netif_tx_unlock_bh(dev);
 311
 312                 skb->dev = dev;
 313
 314                 ret = dev_queue_xmit(skb);
 315                 if (ret)
 316                         ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
 317                                    __func__, ret);
 318                 netif_tx_lock_bh(dev);
 319         }
 320         netif_tx_unlock_bh(dev);
 321
 322         return 0;
 323 }
 324
 325 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 326 {
 327         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 328                                                    carrier_on_task);
 329         struct ib_port_attr attr;
 330
 331         if (ib_query_port(priv->ca, priv->port, &attr) ||
 332             attr.state != IB_PORT_ACTIVE) {
 333                 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
 334                 return;
 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 = ipoib_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 /*
 460  * Caller must hold 'priv->lock'
 461  */
 462 static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
 463 {
 464         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 465         struct ib_sa_multicast *multicast;
 466         struct ib_sa_mcmember_rec rec = {
 467                 .join_state = 1
 468         };
 469         ib_sa_comp_mask comp_mask;
 470         int ret = 0;
 471
 472         if (!priv->broadcast ||
 473             !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 474                 return -EINVAL;
 475
 476         init_completion(&mcast->done);
 477         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 478
 479         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 480
 481         rec.mgid     = mcast->mcmember.mgid;
 482         rec.port_gid = priv->local_gid;
 483         rec.pkey     = cpu_to_be16(priv->pkey);
 484
 485         comp_mask =
 486                 IB_SA_MCMEMBER_REC_MGID         |
 487                 IB_SA_MCMEMBER_REC_PORT_GID     |
 488                 IB_SA_MCMEMBER_REC_PKEY         |
 489                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 490
 491         if (mcast != priv->broadcast) {
 492                 /*
 493                  * RFC 4391:
 494                  *  The MGID MUST use the same P_Key, Q_Key, SL, MTU,
 495                  *  and HopLimit as those used in the broadcast-GID.  The rest
 496                  *  of attributes SHOULD follow the values used in the
 497                  *  broadcast-GID as well.
 498                  */
 499                 comp_mask |=
 500                         IB_SA_MCMEMBER_REC_QKEY                 |
 501                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 502                         IB_SA_MCMEMBER_REC_MTU                  |
 503                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 504                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 505                         IB_SA_MCMEMBER_REC_RATE                 |
 506                         IB_SA_MCMEMBER_REC_SL                   |
 507                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 508                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 509
 510                 rec.qkey          = priv->broadcast->mcmember.qkey;
 511                 rec.mtu_selector  = IB_SA_EQ;
 512                 rec.mtu           = priv->broadcast->mcmember.mtu;
 513                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 514                 rec.rate_selector = IB_SA_EQ;
 515                 rec.rate          = priv->broadcast->mcmember.rate;
 516                 rec.sl            = priv->broadcast->mcmember.sl;
 517                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 518                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 519
 520                 /*
 521                  * Send-only IB Multicast joins work at the core IB layer but
 522                  * require specific SM support.
 523                  * We can use such joins here only if the current SM supports that feature.
 524                  * However, if not, we emulate an Ethernet multicast send,
 525                  * which does not require a multicast subscription and will
 526                  * still send properly. The most appropriate thing to
 527                  * do is to create the group if it doesn't exist as that
 528                  * most closely emulates the behavior, from a user space
 529                  * application perspective, of Ethernet multicast operation.
 530                  */
 531                 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 532                         rec.join_state = SENDONLY_FULLMEMBER_JOIN;
 533         }
 534
 535         multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 536                                          &rec, comp_mask, GFP_ATOMIC,
 537                                          ipoib_mcast_join_complete, mcast);
 538         if (IS_ERR(multicast)) {
 539                 ret = PTR_ERR(multicast);
 540                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 541                 /* Requeue this join task with a backoff delay */
 542                 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
 543                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 544                 complete(&mcast->done);
 545                 return ret;
 546         }
 547         return 0;
 548 }
 549
 550 void ipoib_mcast_join_task(struct work_struct *work)
 551 {
 552         struct ipoib_dev_priv *priv =
 553                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 554         struct net_device *dev = priv->dev;
 555         struct ib_port_attr port_attr;
 556         unsigned long delay_until = 0;
 557         struct ipoib_mcast *mcast = NULL;
 558
 559         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 560                 return;
 561
 562         if (ib_query_port(priv->ca, priv->port, &port_attr)) {
 563                 ipoib_dbg(priv, "ib_query_port() failed\n");
 564                 return;
 565         }
 566         if (port_attr.state != IB_PORT_ACTIVE) {
 567                 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
 568                           port_attr.state);
 569                 return;
 570         }
 571         priv->local_lid = port_attr.lid;
 572         netif_addr_lock_bh(dev);
 573
 574         if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
 575                 netif_addr_unlock_bh(dev);
 576                 return;
 577         }
 578         netif_addr_unlock_bh(dev);
 579
 580         spin_lock_irq(&priv->lock);
 581         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 582                 goto out;
 583
 584         if (!priv->broadcast) {
 585                 struct ipoib_mcast *broadcast;
 586
 587                 broadcast = ipoib_mcast_alloc(dev);
 588                 if (!broadcast) {
 589                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 590                         /*
 591                          * Restart us after a 1 second delay to retry
 592                          * creating our broadcast group and attaching to
 593                          * it.  Until this succeeds, this ipoib dev is
 594                          * completely stalled (multicast wise).
 595                          */
 596                         __ipoib_mcast_schedule_join_thread(priv, NULL, 1);
 597                         goto out;
 598                 }
 599
 600                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 601                        sizeof (union ib_gid));
 602                 priv->broadcast = broadcast;
 603
 604                 __ipoib_mcast_add(dev, priv->broadcast);
 605         }
 606
 607         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 608                 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
 609                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
 610                         mcast = priv->broadcast;
 611                         if (mcast->backoff > 1 &&
 612                             time_before(jiffies, mcast->delay_until)) {
 613                                 delay_until = mcast->delay_until;
 614                                 mcast = NULL;
 615                         }
 616                 }
 617                 goto out;
 618         }
 619
 620         /*
 621          * We'll never get here until the broadcast group is both allocated
 622          * and attached
 623          */
 624         list_for_each_entry(mcast, &priv->multicast_list, list) {
 625                 if (IS_ERR_OR_NULL(mcast->mc) &&
 626                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
 627                     (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
 628                      !skb_queue_empty(&mcast->pkt_queue))) {
 629                         if (mcast->backoff == 1 ||
 630                             time_after_eq(jiffies, mcast->delay_until)) {
 631                                 /* Found the next unjoined group */
 632                                 if (ipoib_mcast_join(dev, mcast)) {
 633                                         spin_unlock_irq(&priv->lock);
 634                                         return;
 635                                 }
 636                         } else if (!delay_until ||
 637                                  time_before(mcast->delay_until, delay_until))
 638                                 delay_until = mcast->delay_until;
 639                 }
 640         }
 641
 642         mcast = NULL;
 643         ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
 644
 645 out:
 646         if (delay_until) {
 647                 cancel_delayed_work(&priv->mcast_task);
 648                 queue_delayed_work(priv->wq, &priv->mcast_task,
 649                                    delay_until - jiffies);
 650         }
 651         if (mcast)
 652                 ipoib_mcast_join(dev, mcast);
 653
 654         spin_unlock_irq(&priv->lock);
 655 }
 656
 657 void ipoib_mcast_start_thread(struct net_device *dev)
 658 {
 659         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 660         unsigned long flags;
 661
 662         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 663
 664         spin_lock_irqsave(&priv->lock, flags);
 665         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 666         spin_unlock_irqrestore(&priv->lock, flags);
 667 }
 668
 669 void ipoib_mcast_stop_thread(struct net_device *dev)
 670 {
 671         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 672
 673         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 674
 675         cancel_delayed_work_sync(&priv->mcast_task);
 676 }
 677
 678 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 679 {
 680         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 681         struct rdma_netdev *rn = netdev_priv(dev);
 682         int ret = 0;
 683
 684         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 685                 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
 686
 687         if (!IS_ERR_OR_NULL(mcast->mc))
 688                 ib_sa_free_multicast(mcast->mc);
 689
 690         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 691                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 692                                 mcast->mcmember.mgid.raw);
 693
 694                 /* Remove ourselves from the multicast group */
 695                 ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
 696                                        be16_to_cpu(mcast->mcmember.mlid));
 697                 if (ret)
 698                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 699         } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 700                 ipoib_dbg(priv, "leaving with no mcmember but not a "
 701                           "SENDONLY join\n");
 702
 703         return 0;
 704 }
 705
 706 /*
 707  * Check if the multicast group is sendonly. If so remove it from the maps
 708  * and add to the remove list
 709  */
 710 void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,
 711                                 struct list_head *remove_list)
 712 {
 713         /* Is this multicast ? */
 714         if (*mgid == 0xff) {
 715                 struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid);
 716
 717                 if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 718                         list_del(&mcast->list);
 719                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 720                         list_add_tail(&mcast->list, remove_list);
 721                 }
 722         }
 723 }
 724
 725 void ipoib_mcast_remove_list(struct list_head *remove_list)
 726 {
 727         struct ipoib_mcast *mcast, *tmcast;
 728
 729         /*
 730          * make sure the in-flight joins have finished before we attempt
 731          * to leave
 732          */
 733         list_for_each_entry_safe(mcast, tmcast, remove_list, list)
 734                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 735                         wait_for_completion(&mcast->done);
 736
 737         list_for_each_entry_safe(mcast, tmcast, remove_list, list) {
 738                 ipoib_mcast_leave(mcast->dev, mcast);
 739                 ipoib_mcast_free(mcast);
 740         }
 741 }
 742
 743 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
 744 {
 745         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 746         struct rdma_netdev *rn = netdev_priv(dev);
 747         struct ipoib_mcast *mcast;
 748         unsigned long flags;
 749         void *mgid = daddr + 4;
 750
 751         spin_lock_irqsave(&priv->lock, flags);
 752
 753         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 754             !priv->broadcast                                    ||
 755             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 756                 ++dev->stats.tx_dropped;
 757                 dev_kfree_skb_any(skb);
 758                 goto unlock;
 759         }
 760
 761         mcast = __ipoib_mcast_find(dev, mgid);
 762         if (!mcast || !mcast->ah) {
 763                 if (!mcast) {
 764                         /* Let's create a new send only group now */
 765                         ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 766                                         mgid);
 767
 768                         mcast = ipoib_mcast_alloc(dev);
 769                         if (!mcast) {
 770                                 ipoib_warn(priv, "unable to allocate memory "
 771                                            "for multicast structure\n");
 772                                 ++dev->stats.tx_dropped;
 773                                 dev_kfree_skb_any(skb);
 774                                 goto unlock;
 775                         }
 776
 777                         set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 778                         memcpy(mcast->mcmember.mgid.raw, mgid,
 779                                sizeof (union ib_gid));
 780                         __ipoib_mcast_add(dev, mcast);
 781                         list_add_tail(&mcast->list, &priv->multicast_list);
 782                 }
 783                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) {
 784                         /* put pseudoheader back on for next time */
 785                         skb_push(skb, sizeof(struct ipoib_pseudo_header));
 786                         skb_queue_tail(&mcast->pkt_queue, skb);
 787                 } else {
 788                         ++dev->stats.tx_dropped;
 789                         dev_kfree_skb_any(skb);
 790                 }
 791                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 792                         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 793                 }
 794         } else {
 795                 struct ipoib_neigh *neigh;
 796
 797                 spin_unlock_irqrestore(&priv->lock, flags);
 798                 neigh = ipoib_neigh_get(dev, daddr);
 799                 spin_lock_irqsave(&priv->lock, flags);
 800                 if (!neigh) {
 801                         neigh = ipoib_neigh_alloc(daddr, dev);
 802                         /* Make sure that the neigh will be added only
 803                          * once to mcast list.
 804                          */
 805                         if (neigh && list_empty(&neigh->list)) {
 806                                 kref_get(&mcast->ah->ref);
 807                                 neigh->ah       = mcast->ah;
 808                                 neigh->ah->valid = 1;
 809                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 810                         }
 811                 }
 812                 spin_unlock_irqrestore(&priv->lock, flags);
 813                 mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah,
 814                                                 IB_MULTICAST_QPN);
 815                 if (neigh)
 816                         ipoib_neigh_put(neigh);
 817                 return;
 818         }
 819
 820 unlock:
 821         spin_unlock_irqrestore(&priv->lock, flags);
 822 }
 823
 824 void ipoib_mcast_dev_flush(struct net_device *dev)
 825 {
 826         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 827         LIST_HEAD(remove_list);
 828         struct ipoib_mcast *mcast, *tmcast;
 829         unsigned long flags;
 830
 831         mutex_lock(&priv->mcast_mutex);
 832         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 833
 834         spin_lock_irqsave(&priv->lock, flags);
 835
 836         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 837                 list_del(&mcast->list);
 838                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 839                 list_add_tail(&mcast->list, &remove_list);
 840         }
 841
 842         if (priv->broadcast) {
 843                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 844                 list_add_tail(&priv->broadcast->list, &remove_list);
 845                 priv->broadcast = NULL;
 846         }
 847
 848         spin_unlock_irqrestore(&priv->lock, flags);
 849
 850         ipoib_mcast_remove_list(&remove_list);
 851         mutex_unlock(&priv->mcast_mutex);
 852 }
 853
 854 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
 855 {
 856         /* reserved QPN, prefix, scope */
 857         if (memcmp(addr, broadcast, 6))
 858                 return 0;
 859         /* signature lower, pkey */
 860         if (memcmp(addr + 7, broadcast + 7, 3))
 861                 return 0;
 862         return 1;
 863 }
 864
 865 void ipoib_mcast_restart_task(struct work_struct *work)
 866 {
 867         struct ipoib_dev_priv *priv =
 868                 container_of(work, struct ipoib_dev_priv, restart_task);
 869         struct net_device *dev = priv->dev;
 870         struct netdev_hw_addr *ha;
 871         struct ipoib_mcast *mcast, *tmcast;
 872         LIST_HEAD(remove_list);
 873         struct ib_sa_mcmember_rec rec;
 874
 875         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 876                 /*
 877                  * shortcut...on shutdown flush is called next, just
 878                  * let it do all the work
 879                  */
 880                 return;
 881
 882         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 883
 884         netif_addr_lock_bh(dev);
 885         spin_lock_irq(&priv->lock);
 886
 887         /*
 888          * Unfortunately, the networking core only gives us a list of all of
 889          * the multicast hardware addresses. We need to figure out which ones
 890          * are new and which ones have been removed
 891          */
 892
 893         /* Clear out the found flag */
 894         list_for_each_entry(mcast, &priv->multicast_list, list)
 895                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 896
 897         /* Mark all of the entries that are found or don't exist */
 898         netdev_for_each_mc_addr(ha, dev) {
 899                 union ib_gid mgid;
 900
 901                 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
 902                         continue;
 903
 904                 memcpy(mgid.raw, ha->addr + 4, sizeof(mgid));
 905
 906                 mcast = __ipoib_mcast_find(dev, &mgid);
 907                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 908                         struct ipoib_mcast *nmcast;
 909
 910                         /* ignore group which is directly joined by userspace */
 911                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 912                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 913                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 914                                                 mgid.raw);
 915                                 continue;
 916                         }
 917
 918                         /* Not found or send-only group, let's add a new entry */
 919                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 920                                         mgid.raw);
 921
 922                         nmcast = ipoib_mcast_alloc(dev);
 923                         if (!nmcast) {
 924                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 925                                 continue;
 926                         }
 927
 928                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 929
 930                         nmcast->mcmember.mgid = mgid;
 931
 932                         if (mcast) {
 933                                 /* Destroy the send only entry */
 934                                 list_move_tail(&mcast->list, &remove_list);
 935
 936                                 rb_replace_node(&mcast->rb_node,
 937                                                 &nmcast->rb_node,
 938                                                 &priv->multicast_tree);
 939                         } else
 940                                 __ipoib_mcast_add(dev, nmcast);
 941
 942                         list_add_tail(&nmcast->list, &priv->multicast_list);
 943                 }
 944
 945                 if (mcast)
 946                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 947         }
 948
 949         /* Remove all of the entries don't exist anymore */
 950         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 951                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 952                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 953                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 954                                         mcast->mcmember.mgid.raw);
 955
 956                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 957
 958                         /* Move to the remove list */
 959                         list_move_tail(&mcast->list, &remove_list);
 960                 }
 961         }
 962
 963         spin_unlock_irq(&priv->lock);
 964         netif_addr_unlock_bh(dev);
 965
 966         ipoib_mcast_remove_list(&remove_list);
 967
 968         /*
 969          * Double check that we are still up
 970          */
 971         if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 972                 spin_lock_irq(&priv->lock);
 973                 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 974                 spin_unlock_irq(&priv->lock);
 975         }
 976 }
 977
 978 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 979
 980 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 981 {
 982         struct ipoib_mcast_iter *iter;
 983
 984         iter = kmalloc(sizeof(*iter), GFP_KERNEL);
 985         if (!iter)
 986                 return NULL;
 987
 988         iter->dev = dev;
 989         memset(iter->mgid.raw, 0, 16);
 990
 991         if (ipoib_mcast_iter_next(iter)) {
 992                 kfree(iter);
 993                 return NULL;
 994         }
 995
 996         return iter;
 997 }
 998
 999 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
1000 {
1001         struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
1002         struct rb_node *n;
1003         struct ipoib_mcast *mcast;
1004         int ret = 1;
1005
1006         spin_lock_irq(&priv->lock);
1007
1008         n = rb_first(&priv->multicast_tree);
1009
1010         while (n) {
1011                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
1012
1013                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
1014                            sizeof (union ib_gid)) < 0) {
1015                         iter->mgid      = mcast->mcmember.mgid;
1016                         iter->created   = mcast->created;
1017                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
1018                         iter->complete  = !!mcast->ah;
1019                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1020
1021                         ret = 0;
1022
1023                         break;
1024                 }
1025
1026                 n = rb_next(n);
1027         }
1028
1029         spin_unlock_irq(&priv->lock);
1030
1031         return ret;
1032 }
1033
1034 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1035                            union ib_gid *mgid,
1036                            unsigned long *created,
1037                            unsigned int *queuelen,
1038                            unsigned int *complete,
1039                            unsigned int *send_only)
1040 {
1041         *mgid      = iter->mgid;
1042         *created   = iter->created;
1043         *queuelen  = iter->queuelen;
1044         *complete  = iter->complete;
1045         *send_only = iter->send_only;
1046 }
1047
1048 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */