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 /* 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          * Check if can send sendonly MCG's with sendonly-fullmember join state.
 338          * It done here after the successfully join to the broadcast group,
 339          * because the broadcast group must always be joined first and is always
 340          * re-joined if the SM changes substantially.
 341          */
 342         priv->sm_fullmember_sendonly_support =
 343                 ib_sa_sendonly_fullmem_support(&ipoib_sa_client,
 344                                                priv->ca, priv->port);
 345         /*
 346          * Take rtnl_lock to avoid racing with ipoib_stop() and
 347          * turning the carrier back on while a device is being
 348          * removed.  However, ipoib_stop() will attempt to flush
 349          * the workqueue while holding the rtnl lock, so loop
 350          * on trylock until either we get the lock or we see
 351          * FLAG_OPER_UP go away as that signals that we are bailing
 352          * and can safely ignore the carrier on work.
 353          */
 354         while (!rtnl_trylock()) {
 355                 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 356                         return;
 357                 else
 358                         msleep(20);
 359         }
 360         if (!ipoib_cm_admin_enabled(priv->dev))
 361                 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
 362         netif_carrier_on(priv->dev);
 363         rtnl_unlock();
 364 }
 365
 366 static int ipoib_mcast_join_complete(int status,
 367                                      struct ib_sa_multicast *multicast)
 368 {
 369         struct ipoib_mcast *mcast = multicast->context;
 370         struct net_device *dev = mcast->dev;
 371         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 372
 373         ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",
 374                         test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?
 375                         "sendonly " : "",
 376                         mcast->mcmember.mgid.raw, status);
 377
 378         /* We trap for port events ourselves. */
 379         if (status == -ENETRESET) {
 380                 status = 0;
 381                 goto out;
 382         }
 383
 384         if (!status)
 385                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 386
 387         if (!status) {
 388                 mcast->backoff = 1;
 389                 mcast->delay_until = jiffies;
 390
 391                 /*
 392                  * Defer carrier on work to priv->wq to avoid a
 393                  * deadlock on rtnl_lock here.  Requeue our multicast
 394                  * work too, which will end up happening right after
 395                  * our carrier on task work and will allow us to
 396                  * send out all of the non-broadcast joins
 397                  */
 398                 if (mcast == priv->broadcast) {
 399                         spin_lock_irq(&priv->lock);
 400                         queue_work(priv->wq, &priv->carrier_on_task);
 401                         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 402                         goto out_locked;
 403                 }
 404         } else {
 405                 bool silent_fail =
 406                     test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
 407                     status == -EINVAL;
 408
 409                 if (mcast->logcount < 20) {
 410                         if (status == -ETIMEDOUT || status == -EAGAIN ||
 411                             silent_fail) {
 412                                 ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
 413                                                 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
 414                                                 mcast->mcmember.mgid.raw, status);
 415                         } else {
 416                                 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
 417                                                 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
 418                                            mcast->mcmember.mgid.raw, status);
 419                         }
 420
 421                         if (!silent_fail)
 422                                 mcast->logcount++;
 423                 }
 424
 425                 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
 426                     mcast->backoff >= 2) {
 427                         /*
 428                          * We only retry sendonly joins once before we drop
 429                          * the packet and quit trying to deal with the
 430                          * group.  However, we leave the group in the
 431                          * mcast list as an unjoined group.  If we want to
 432                          * try joining again, we simply queue up a packet
 433                          * and restart the join thread.  The empty queue
 434                          * is why the join thread ignores this group.
 435                          */
 436                         mcast->backoff = 1;
 437                         netif_tx_lock_bh(dev);
 438                         while (!skb_queue_empty(&mcast->pkt_queue)) {
 439                                 ++dev->stats.tx_dropped;
 440                                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 441                         }
 442                         netif_tx_unlock_bh(dev);
 443                 } else {
 444                         spin_lock_irq(&priv->lock);
 445                         /* Requeue this join task with a backoff delay */
 446                         __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
 447                         goto out_locked;
 448                 }
 449         }
 450 out:
 451         spin_lock_irq(&priv->lock);
 452 out_locked:
 453         /*
 454          * Make sure to set mcast->mc before we clear the busy flag to avoid
 455          * racing with code that checks for BUSY before checking mcast->mc
 456          */
 457         if (status)
 458                 mcast->mc = NULL;
 459         else
 460                 mcast->mc = multicast;
 461         clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 462         spin_unlock_irq(&priv->lock);
 463         complete(&mcast->done);
 464
 465         return status;
 466 }
 467
 468 /*
 469  * Caller must hold 'priv->lock'
 470  */
 471 static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
 472 {
 473         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 474         struct ib_sa_multicast *multicast;
 475         struct ib_sa_mcmember_rec rec = {
 476                 .join_state = 1
 477         };
 478         ib_sa_comp_mask comp_mask;
 479         int ret = 0;
 480
 481         if (!priv->broadcast ||
 482             !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 483                 return -EINVAL;
 484
 485         init_completion(&mcast->done);
 486         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 487
 488         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 489
 490         rec.mgid     = mcast->mcmember.mgid;
 491         rec.port_gid = priv->local_gid;
 492         rec.pkey     = cpu_to_be16(priv->pkey);
 493
 494         comp_mask =
 495                 IB_SA_MCMEMBER_REC_MGID         |
 496                 IB_SA_MCMEMBER_REC_PORT_GID     |
 497                 IB_SA_MCMEMBER_REC_PKEY         |
 498                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 499
 500         if (mcast != priv->broadcast) {
 501                 /*
 502                  * RFC 4391:
 503                  *  The MGID MUST use the same P_Key, Q_Key, SL, MTU,
 504                  *  and HopLimit as those used in the broadcast-GID.  The rest
 505                  *  of attributes SHOULD follow the values used in the
 506                  *  broadcast-GID as well.
 507                  */
 508                 comp_mask |=
 509                         IB_SA_MCMEMBER_REC_QKEY                 |
 510                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 511                         IB_SA_MCMEMBER_REC_MTU                  |
 512                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 513                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 514                         IB_SA_MCMEMBER_REC_RATE                 |
 515                         IB_SA_MCMEMBER_REC_SL                   |
 516                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 517                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 518
 519                 rec.qkey          = priv->broadcast->mcmember.qkey;
 520                 rec.mtu_selector  = IB_SA_EQ;
 521                 rec.mtu           = priv->broadcast->mcmember.mtu;
 522                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 523                 rec.rate_selector = IB_SA_EQ;
 524                 rec.rate          = priv->broadcast->mcmember.rate;
 525                 rec.sl            = priv->broadcast->mcmember.sl;
 526                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 527                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 528
 529                 /*
 530                  * Send-only IB Multicast joins work at the core IB layer but
 531                  * require specific SM support.
 532                  * We can use such joins here only if the current SM supports that feature.
 533                  * However, if not, we emulate an Ethernet multicast send,
 534                  * which does not require a multicast subscription and will
 535                  * still send properly. The most appropriate thing to
 536                  * do is to create the group if it doesn't exist as that
 537                  * most closely emulates the behavior, from a user space
 538                  * application perspective, of Ethernet multicast operation.
 539                  */
 540                 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
 541                     priv->sm_fullmember_sendonly_support)
 542                         /* SM supports sendonly-fullmember, otherwise fallback to full-member */
 543                         rec.join_state = SENDONLY_FULLMEMBER_JOIN;
 544         }
 545         spin_unlock_irq(&priv->lock);
 546
 547         multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 548                                          &rec, comp_mask, GFP_KERNEL,
 549                                          ipoib_mcast_join_complete, mcast);
 550         spin_lock_irq(&priv->lock);
 551         if (IS_ERR(multicast)) {
 552                 ret = PTR_ERR(multicast);
 553                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 554                 /* Requeue this join task with a backoff delay */
 555                 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
 556                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 557                 spin_unlock_irq(&priv->lock);
 558                 complete(&mcast->done);
 559                 spin_lock_irq(&priv->lock);
 560         }
 561         return 0;
 562 }
 563
 564 void ipoib_mcast_join_task(struct work_struct *work)
 565 {
 566         struct ipoib_dev_priv *priv =
 567                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 568         struct net_device *dev = priv->dev;
 569         struct ib_port_attr port_attr;
 570         unsigned long delay_until = 0;
 571         struct ipoib_mcast *mcast = NULL;
 572
 573         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 574                 return;
 575
 576         if (ib_query_port(priv->ca, priv->port, &port_attr)) {
 577                 ipoib_dbg(priv, "ib_query_port() failed\n");
 578                 return;
 579         }
 580         if (port_attr.state != IB_PORT_ACTIVE) {
 581                 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
 582                           port_attr.state);
 583                 return;
 584         }
 585         priv->local_lid = port_attr.lid;
 586         netif_addr_lock_bh(dev);
 587
 588         if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
 589                 netif_addr_unlock_bh(dev);
 590                 return;
 591         }
 592         netif_addr_unlock_bh(dev);
 593
 594         spin_lock_irq(&priv->lock);
 595         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 596                 goto out;
 597
 598         if (!priv->broadcast) {
 599                 struct ipoib_mcast *broadcast;
 600
 601                 broadcast = ipoib_mcast_alloc(dev);
 602                 if (!broadcast) {
 603                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 604                         /*
 605                          * Restart us after a 1 second delay to retry
 606                          * creating our broadcast group and attaching to
 607                          * it.  Until this succeeds, this ipoib dev is
 608                          * completely stalled (multicast wise).
 609                          */
 610                         __ipoib_mcast_schedule_join_thread(priv, NULL, 1);
 611                         goto out;
 612                 }
 613
 614                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 615                        sizeof (union ib_gid));
 616                 priv->broadcast = broadcast;
 617
 618                 __ipoib_mcast_add(dev, priv->broadcast);
 619         }
 620
 621         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 622                 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
 623                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
 624                         mcast = priv->broadcast;
 625                         if (mcast->backoff > 1 &&
 626                             time_before(jiffies, mcast->delay_until)) {
 627                                 delay_until = mcast->delay_until;
 628                                 mcast = NULL;
 629                         }
 630                 }
 631                 goto out;
 632         }
 633
 634         /*
 635          * We'll never get here until the broadcast group is both allocated
 636          * and attached
 637          */
 638         list_for_each_entry(mcast, &priv->multicast_list, list) {
 639                 if (IS_ERR_OR_NULL(mcast->mc) &&
 640                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
 641                     (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
 642                      !skb_queue_empty(&mcast->pkt_queue))) {
 643                         if (mcast->backoff == 1 ||
 644                             time_after_eq(jiffies, mcast->delay_until)) {
 645                                 /* Found the next unjoined group */
 646                                 if (ipoib_mcast_join(dev, mcast)) {
 647                                         spin_unlock_irq(&priv->lock);
 648                                         return;
 649                                 }
 650                         } else if (!delay_until ||
 651                                  time_before(mcast->delay_until, delay_until))
 652                                 delay_until = mcast->delay_until;
 653                 }
 654         }
 655
 656         mcast = NULL;
 657         ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
 658
 659 out:
 660         if (delay_until) {
 661                 cancel_delayed_work(&priv->mcast_task);
 662                 queue_delayed_work(priv->wq, &priv->mcast_task,
 663                                    delay_until - jiffies);
 664         }
 665         if (mcast)
 666                 ipoib_mcast_join(dev, mcast);
 667
 668         spin_unlock_irq(&priv->lock);
 669 }
 670
 671 void ipoib_mcast_start_thread(struct net_device *dev)
 672 {
 673         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 674         unsigned long flags;
 675
 676         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 677
 678         spin_lock_irqsave(&priv->lock, flags);
 679         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 680         spin_unlock_irqrestore(&priv->lock, flags);
 681 }
 682
 683 void ipoib_mcast_stop_thread(struct net_device *dev)
 684 {
 685         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 686
 687         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 688
 689         cancel_delayed_work_sync(&priv->mcast_task);
 690 }
 691
 692 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 693 {
 694         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 695         struct rdma_netdev *rn = netdev_priv(dev);
 696         int ret = 0;
 697
 698         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 699                 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
 700
 701         if (!IS_ERR_OR_NULL(mcast->mc))
 702                 ib_sa_free_multicast(mcast->mc);
 703
 704         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 705                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 706                                 mcast->mcmember.mgid.raw);
 707
 708                 /* Remove ourselves from the multicast group */
 709                 ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
 710                                        be16_to_cpu(mcast->mcmember.mlid));
 711                 if (ret)
 712                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 713         } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 714                 ipoib_dbg(priv, "leaving with no mcmember but not a "
 715                           "SENDONLY join\n");
 716
 717         return 0;
 718 }
 719
 720 /*
 721  * Check if the multicast group is sendonly. If so remove it from the maps
 722  * and add to the remove list
 723  */
 724 void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,
 725                                 struct list_head *remove_list)
 726 {
 727         /* Is this multicast ? */
 728         if (*mgid == 0xff) {
 729                 struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid);
 730
 731                 if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 732                         list_del(&mcast->list);
 733                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 734                         list_add_tail(&mcast->list, remove_list);
 735                 }
 736         }
 737 }
 738
 739 void ipoib_mcast_remove_list(struct list_head *remove_list)
 740 {
 741         struct ipoib_mcast *mcast, *tmcast;
 742
 743         /*
 744          * make sure the in-flight joins have finished before we attempt
 745          * to leave
 746          */
 747         list_for_each_entry_safe(mcast, tmcast, remove_list, list)
 748                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 749                         wait_for_completion(&mcast->done);
 750
 751         list_for_each_entry_safe(mcast, tmcast, remove_list, list) {
 752                 ipoib_mcast_leave(mcast->dev, mcast);
 753                 ipoib_mcast_free(mcast);
 754         }
 755 }
 756
 757 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
 758 {
 759         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 760         struct rdma_netdev *rn = netdev_priv(dev);
 761         struct ipoib_mcast *mcast;
 762         unsigned long flags;
 763         void *mgid = daddr + 4;
 764
 765         spin_lock_irqsave(&priv->lock, flags);
 766
 767         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 768             !priv->broadcast                                    ||
 769             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 770                 ++dev->stats.tx_dropped;
 771                 dev_kfree_skb_any(skb);
 772                 goto unlock;
 773         }
 774
 775         mcast = __ipoib_mcast_find(dev, mgid);
 776         if (!mcast || !mcast->ah) {
 777                 if (!mcast) {
 778                         /* Let's create a new send only group now */
 779                         ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 780                                         mgid);
 781
 782                         mcast = ipoib_mcast_alloc(dev);
 783                         if (!mcast) {
 784                                 ipoib_warn(priv, "unable to allocate memory "
 785                                            "for multicast structure\n");
 786                                 ++dev->stats.tx_dropped;
 787                                 dev_kfree_skb_any(skb);
 788                                 goto unlock;
 789                         }
 790
 791                         set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 792                         memcpy(mcast->mcmember.mgid.raw, mgid,
 793                                sizeof (union ib_gid));
 794                         __ipoib_mcast_add(dev, mcast);
 795                         list_add_tail(&mcast->list, &priv->multicast_list);
 796                 }
 797                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) {
 798                         /* put pseudoheader back on for next time */
 799                         skb_push(skb, sizeof(struct ipoib_pseudo_header));
 800                         skb_queue_tail(&mcast->pkt_queue, skb);
 801                 } else {
 802                         ++dev->stats.tx_dropped;
 803                         dev_kfree_skb_any(skb);
 804                 }
 805                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 806                         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 807                 }
 808         } else {
 809                 struct ipoib_neigh *neigh;
 810
 811                 spin_unlock_irqrestore(&priv->lock, flags);
 812                 neigh = ipoib_neigh_get(dev, daddr);
 813                 spin_lock_irqsave(&priv->lock, flags);
 814                 if (!neigh) {
 815                         neigh = ipoib_neigh_alloc(daddr, dev);
 816                         /* Make sure that the neigh will be added only
 817                          * once to mcast list.
 818                          */
 819                         if (neigh && list_empty(&neigh->list)) {
 820                                 kref_get(&mcast->ah->ref);
 821                                 neigh->ah       = mcast->ah;
 822                                 neigh->ah->valid = 1;
 823                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 824                         }
 825                 }
 826                 spin_unlock_irqrestore(&priv->lock, flags);
 827                 mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah,
 828                                                 IB_MULTICAST_QPN);
 829                 if (neigh)
 830                         ipoib_neigh_put(neigh);
 831                 return;
 832         }
 833
 834 unlock:
 835         spin_unlock_irqrestore(&priv->lock, flags);
 836 }
 837
 838 void ipoib_mcast_dev_flush(struct net_device *dev)
 839 {
 840         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 841         LIST_HEAD(remove_list);
 842         struct ipoib_mcast *mcast, *tmcast;
 843         unsigned long flags;
 844
 845         mutex_lock(&priv->mcast_mutex);
 846         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 847
 848         spin_lock_irqsave(&priv->lock, flags);
 849
 850         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 851                 list_del(&mcast->list);
 852                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 853                 list_add_tail(&mcast->list, &remove_list);
 854         }
 855
 856         if (priv->broadcast) {
 857                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 858                 list_add_tail(&priv->broadcast->list, &remove_list);
 859                 priv->broadcast = NULL;
 860         }
 861
 862         spin_unlock_irqrestore(&priv->lock, flags);
 863
 864         ipoib_mcast_remove_list(&remove_list);
 865         mutex_unlock(&priv->mcast_mutex);
 866 }
 867
 868 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
 869 {
 870         /* reserved QPN, prefix, scope */
 871         if (memcmp(addr, broadcast, 6))
 872                 return 0;
 873         /* signature lower, pkey */
 874         if (memcmp(addr + 7, broadcast + 7, 3))
 875                 return 0;
 876         return 1;
 877 }
 878
 879 void ipoib_mcast_restart_task(struct work_struct *work)
 880 {
 881         struct ipoib_dev_priv *priv =
 882                 container_of(work, struct ipoib_dev_priv, restart_task);
 883         struct net_device *dev = priv->dev;
 884         struct netdev_hw_addr *ha;
 885         struct ipoib_mcast *mcast, *tmcast;
 886         LIST_HEAD(remove_list);
 887         struct ib_sa_mcmember_rec rec;
 888
 889         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 890                 /*
 891                  * shortcut...on shutdown flush is called next, just
 892                  * let it do all the work
 893                  */
 894                 return;
 895
 896         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 897
 898         netif_addr_lock_bh(dev);
 899         spin_lock_irq(&priv->lock);
 900
 901         /*
 902          * Unfortunately, the networking core only gives us a list of all of
 903          * the multicast hardware addresses. We need to figure out which ones
 904          * are new and which ones have been removed
 905          */
 906
 907         /* Clear out the found flag */
 908         list_for_each_entry(mcast, &priv->multicast_list, list)
 909                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 910
 911         /* Mark all of the entries that are found or don't exist */
 912         netdev_for_each_mc_addr(ha, dev) {
 913                 union ib_gid mgid;
 914
 915                 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
 916                         continue;
 917
 918                 memcpy(mgid.raw, ha->addr + 4, sizeof(mgid));
 919
 920                 mcast = __ipoib_mcast_find(dev, &mgid);
 921                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 922                         struct ipoib_mcast *nmcast;
 923
 924                         /* ignore group which is directly joined by userspace */
 925                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 926                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 927                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 928                                                 mgid.raw);
 929                                 continue;
 930                         }
 931
 932                         /* Not found or send-only group, let's add a new entry */
 933                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 934                                         mgid.raw);
 935
 936                         nmcast = ipoib_mcast_alloc(dev);
 937                         if (!nmcast) {
 938                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 939                                 continue;
 940                         }
 941
 942                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 943
 944                         nmcast->mcmember.mgid = mgid;
 945
 946                         if (mcast) {
 947                                 /* Destroy the send only entry */
 948                                 list_move_tail(&mcast->list, &remove_list);
 949
 950                                 rb_replace_node(&mcast->rb_node,
 951                                                 &nmcast->rb_node,
 952                                                 &priv->multicast_tree);
 953                         } else
 954                                 __ipoib_mcast_add(dev, nmcast);
 955
 956                         list_add_tail(&nmcast->list, &priv->multicast_list);
 957                 }
 958
 959                 if (mcast)
 960                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 961         }
 962
 963         /* Remove all of the entries don't exist anymore */
 964         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 965                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 966                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 967                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 968                                         mcast->mcmember.mgid.raw);
 969
 970                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 971
 972                         /* Move to the remove list */
 973                         list_move_tail(&mcast->list, &remove_list);
 974                 }
 975         }
 976
 977         spin_unlock_irq(&priv->lock);
 978         netif_addr_unlock_bh(dev);
 979
 980         ipoib_mcast_remove_list(&remove_list);
 981
 982         /*
 983          * Double check that we are still up
 984          */
 985         if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 986                 spin_lock_irq(&priv->lock);
 987                 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 988                 spin_unlock_irq(&priv->lock);
 989         }
 990 }
 991
 992 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 993
 994 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 995 {
 996         struct ipoib_mcast_iter *iter;
 997
 998         iter = kmalloc(sizeof(*iter), GFP_KERNEL);
 999         if (!iter)
1000                 return NULL;
1001
1002         iter->dev = dev;
1003         memset(iter->mgid.raw, 0, 16);
1004
1005         if (ipoib_mcast_iter_next(iter)) {
1006                 kfree(iter);
1007                 return NULL;
1008         }
1009
1010         return iter;
1011 }
1012
1013 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
1014 {
1015         struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
1016         struct rb_node *n;
1017         struct ipoib_mcast *mcast;
1018         int ret = 1;
1019
1020         spin_lock_irq(&priv->lock);
1021
1022         n = rb_first(&priv->multicast_tree);
1023
1024         while (n) {
1025                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
1026
1027                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
1028                            sizeof (union ib_gid)) < 0) {
1029                         iter->mgid      = mcast->mcmember.mgid;
1030                         iter->created   = mcast->created;
1031                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
1032                         iter->complete  = !!mcast->ah;
1033                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1034
1035                         ret = 0;
1036
1037                         break;
1038                 }
1039
1040                 n = rb_next(n);
1041         }
1042
1043         spin_unlock_irq(&priv->lock);
1044
1045         return ret;
1046 }
1047
1048 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1049                            union ib_gid *mgid,
1050                            unsigned long *created,
1051                            unsigned int *queuelen,
1052                            unsigned int *complete,
1053                            unsigned int *send_only)
1054 {
1055         *mgid      = iter->mgid;
1056         *created   = iter->created;
1057         *queuelen  = iter->queuelen;
1058         *complete  = iter->complete;
1059         *send_only = iter->send_only;
1060 }
1061
1062 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */