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          * 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         spin_unlock_irq(&priv->lock);
 535
 536         multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 537                                          &rec, comp_mask, GFP_KERNEL,
 538                                          ipoib_mcast_join_complete, mcast);
 539         spin_lock_irq(&priv->lock);
 540         if (IS_ERR(multicast)) {
 541                 ret = PTR_ERR(multicast);
 542                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 543                 /* Requeue this join task with a backoff delay */
 544                 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
 545                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 546                 spin_unlock_irq(&priv->lock);
 547                 complete(&mcast->done);
 548                 spin_lock_irq(&priv->lock);
 549         }
 550         return 0;
 551 }
 552
 553 void ipoib_mcast_join_task(struct work_struct *work)
 554 {
 555         struct ipoib_dev_priv *priv =
 556                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 557         struct net_device *dev = priv->dev;
 558         struct ib_port_attr port_attr;
 559         unsigned long delay_until = 0;
 560         struct ipoib_mcast *mcast = NULL;
 561
 562         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 563                 return;
 564
 565         if (ib_query_port(priv->ca, priv->port, &port_attr)) {
 566                 ipoib_dbg(priv, "ib_query_port() failed\n");
 567                 return;
 568         }
 569         if (port_attr.state != IB_PORT_ACTIVE) {
 570                 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
 571                           port_attr.state);
 572                 return;
 573         }
 574         priv->local_lid = port_attr.lid;
 575         netif_addr_lock_bh(dev);
 576
 577         if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
 578                 netif_addr_unlock_bh(dev);
 579                 return;
 580         }
 581         netif_addr_unlock_bh(dev);
 582
 583         spin_lock_irq(&priv->lock);
 584         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 585                 goto out;
 586
 587         if (!priv->broadcast) {
 588                 struct ipoib_mcast *broadcast;
 589
 590                 broadcast = ipoib_mcast_alloc(dev);
 591                 if (!broadcast) {
 592                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 593                         /*
 594                          * Restart us after a 1 second delay to retry
 595                          * creating our broadcast group and attaching to
 596                          * it.  Until this succeeds, this ipoib dev is
 597                          * completely stalled (multicast wise).
 598                          */
 599                         __ipoib_mcast_schedule_join_thread(priv, NULL, 1);
 600                         goto out;
 601                 }
 602
 603                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 604                        sizeof (union ib_gid));
 605                 priv->broadcast = broadcast;
 606
 607                 __ipoib_mcast_add(dev, priv->broadcast);
 608         }
 609
 610         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 611                 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
 612                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
 613                         mcast = priv->broadcast;
 614                         if (mcast->backoff > 1 &&
 615                             time_before(jiffies, mcast->delay_until)) {
 616                                 delay_until = mcast->delay_until;
 617                                 mcast = NULL;
 618                         }
 619                 }
 620                 goto out;
 621         }
 622
 623         /*
 624          * We'll never get here until the broadcast group is both allocated
 625          * and attached
 626          */
 627         list_for_each_entry(mcast, &priv->multicast_list, list) {
 628                 if (IS_ERR_OR_NULL(mcast->mc) &&
 629                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
 630                     (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
 631                      !skb_queue_empty(&mcast->pkt_queue))) {
 632                         if (mcast->backoff == 1 ||
 633                             time_after_eq(jiffies, mcast->delay_until)) {
 634                                 /* Found the next unjoined group */
 635                                 if (ipoib_mcast_join(dev, mcast)) {
 636                                         spin_unlock_irq(&priv->lock);
 637                                         return;
 638                                 }
 639                         } else if (!delay_until ||
 640                                  time_before(mcast->delay_until, delay_until))
 641                                 delay_until = mcast->delay_until;
 642                 }
 643         }
 644
 645         mcast = NULL;
 646         ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
 647
 648 out:
 649         if (delay_until) {
 650                 cancel_delayed_work(&priv->mcast_task);
 651                 queue_delayed_work(priv->wq, &priv->mcast_task,
 652                                    delay_until - jiffies);
 653         }
 654         if (mcast)
 655                 ipoib_mcast_join(dev, mcast);
 656
 657         spin_unlock_irq(&priv->lock);
 658 }
 659
 660 void ipoib_mcast_start_thread(struct net_device *dev)
 661 {
 662         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 663         unsigned long flags;
 664
 665         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 666
 667         spin_lock_irqsave(&priv->lock, flags);
 668         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 669         spin_unlock_irqrestore(&priv->lock, flags);
 670 }
 671
 672 void ipoib_mcast_stop_thread(struct net_device *dev)
 673 {
 674         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 675
 676         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 677
 678         cancel_delayed_work_sync(&priv->mcast_task);
 679 }
 680
 681 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 682 {
 683         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 684         struct rdma_netdev *rn = netdev_priv(dev);
 685         int ret = 0;
 686
 687         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 688                 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
 689
 690         if (!IS_ERR_OR_NULL(mcast->mc))
 691                 ib_sa_free_multicast(mcast->mc);
 692
 693         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 694                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 695                                 mcast->mcmember.mgid.raw);
 696
 697                 /* Remove ourselves from the multicast group */
 698                 ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
 699                                        be16_to_cpu(mcast->mcmember.mlid));
 700                 if (ret)
 701                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 702         } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 703                 ipoib_dbg(priv, "leaving with no mcmember but not a "
 704                           "SENDONLY join\n");
 705
 706         return 0;
 707 }
 708
 709 /*
 710  * Check if the multicast group is sendonly. If so remove it from the maps
 711  * and add to the remove list
 712  */
 713 void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,
 714                                 struct list_head *remove_list)
 715 {
 716         /* Is this multicast ? */
 717         if (*mgid == 0xff) {
 718                 struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid);
 719
 720                 if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 721                         list_del(&mcast->list);
 722                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 723                         list_add_tail(&mcast->list, remove_list);
 724                 }
 725         }
 726 }
 727
 728 void ipoib_mcast_remove_list(struct list_head *remove_list)
 729 {
 730         struct ipoib_mcast *mcast, *tmcast;
 731
 732         /*
 733          * make sure the in-flight joins have finished before we attempt
 734          * to leave
 735          */
 736         list_for_each_entry_safe(mcast, tmcast, remove_list, list)
 737                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 738                         wait_for_completion(&mcast->done);
 739
 740         list_for_each_entry_safe(mcast, tmcast, remove_list, list) {
 741                 ipoib_mcast_leave(mcast->dev, mcast);
 742                 ipoib_mcast_free(mcast);
 743         }
 744 }
 745
 746 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
 747 {
 748         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 749         struct rdma_netdev *rn = netdev_priv(dev);
 750         struct ipoib_mcast *mcast;
 751         unsigned long flags;
 752         void *mgid = daddr + 4;
 753
 754         spin_lock_irqsave(&priv->lock, flags);
 755
 756         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 757             !priv->broadcast                                    ||
 758             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 759                 ++dev->stats.tx_dropped;
 760                 dev_kfree_skb_any(skb);
 761                 goto unlock;
 762         }
 763
 764         mcast = __ipoib_mcast_find(dev, mgid);
 765         if (!mcast || !mcast->ah) {
 766                 if (!mcast) {
 767                         /* Let's create a new send only group now */
 768                         ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 769                                         mgid);
 770
 771                         mcast = ipoib_mcast_alloc(dev);
 772                         if (!mcast) {
 773                                 ipoib_warn(priv, "unable to allocate memory "
 774                                            "for multicast structure\n");
 775                                 ++dev->stats.tx_dropped;
 776                                 dev_kfree_skb_any(skb);
 777                                 goto unlock;
 778                         }
 779
 780                         set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 781                         memcpy(mcast->mcmember.mgid.raw, mgid,
 782                                sizeof (union ib_gid));
 783                         __ipoib_mcast_add(dev, mcast);
 784                         list_add_tail(&mcast->list, &priv->multicast_list);
 785                 }
 786                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) {
 787                         /* put pseudoheader back on for next time */
 788                         skb_push(skb, sizeof(struct ipoib_pseudo_header));
 789                         skb_queue_tail(&mcast->pkt_queue, skb);
 790                 } else {
 791                         ++dev->stats.tx_dropped;
 792                         dev_kfree_skb_any(skb);
 793                 }
 794                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 795                         __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 796                 }
 797         } else {
 798                 struct ipoib_neigh *neigh;
 799
 800                 spin_unlock_irqrestore(&priv->lock, flags);
 801                 neigh = ipoib_neigh_get(dev, daddr);
 802                 spin_lock_irqsave(&priv->lock, flags);
 803                 if (!neigh) {
 804                         neigh = ipoib_neigh_alloc(daddr, dev);
 805                         /* Make sure that the neigh will be added only
 806                          * once to mcast list.
 807                          */
 808                         if (neigh && list_empty(&neigh->list)) {
 809                                 kref_get(&mcast->ah->ref);
 810                                 neigh->ah       = mcast->ah;
 811                                 neigh->ah->valid = 1;
 812                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 813                         }
 814                 }
 815                 spin_unlock_irqrestore(&priv->lock, flags);
 816                 mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah,
 817                                                 IB_MULTICAST_QPN);
 818                 if (neigh)
 819                         ipoib_neigh_put(neigh);
 820                 return;
 821         }
 822
 823 unlock:
 824         spin_unlock_irqrestore(&priv->lock, flags);
 825 }
 826
 827 void ipoib_mcast_dev_flush(struct net_device *dev)
 828 {
 829         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 830         LIST_HEAD(remove_list);
 831         struct ipoib_mcast *mcast, *tmcast;
 832         unsigned long flags;
 833
 834         mutex_lock(&priv->mcast_mutex);
 835         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 836
 837         spin_lock_irqsave(&priv->lock, flags);
 838
 839         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 840                 list_del(&mcast->list);
 841                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 842                 list_add_tail(&mcast->list, &remove_list);
 843         }
 844
 845         if (priv->broadcast) {
 846                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 847                 list_add_tail(&priv->broadcast->list, &remove_list);
 848                 priv->broadcast = NULL;
 849         }
 850
 851         spin_unlock_irqrestore(&priv->lock, flags);
 852
 853         ipoib_mcast_remove_list(&remove_list);
 854         mutex_unlock(&priv->mcast_mutex);
 855 }
 856
 857 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
 858 {
 859         /* reserved QPN, prefix, scope */
 860         if (memcmp(addr, broadcast, 6))
 861                 return 0;
 862         /* signature lower, pkey */
 863         if (memcmp(addr + 7, broadcast + 7, 3))
 864                 return 0;
 865         return 1;
 866 }
 867
 868 void ipoib_mcast_restart_task(struct work_struct *work)
 869 {
 870         struct ipoib_dev_priv *priv =
 871                 container_of(work, struct ipoib_dev_priv, restart_task);
 872         struct net_device *dev = priv->dev;
 873         struct netdev_hw_addr *ha;
 874         struct ipoib_mcast *mcast, *tmcast;
 875         LIST_HEAD(remove_list);
 876         struct ib_sa_mcmember_rec rec;
 877
 878         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
 879                 /*
 880                  * shortcut...on shutdown flush is called next, just
 881                  * let it do all the work
 882                  */
 883                 return;
 884
 885         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 886
 887         netif_addr_lock_bh(dev);
 888         spin_lock_irq(&priv->lock);
 889
 890         /*
 891          * Unfortunately, the networking core only gives us a list of all of
 892          * the multicast hardware addresses. We need to figure out which ones
 893          * are new and which ones have been removed
 894          */
 895
 896         /* Clear out the found flag */
 897         list_for_each_entry(mcast, &priv->multicast_list, list)
 898                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 899
 900         /* Mark all of the entries that are found or don't exist */
 901         netdev_for_each_mc_addr(ha, dev) {
 902                 union ib_gid mgid;
 903
 904                 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
 905                         continue;
 906
 907                 memcpy(mgid.raw, ha->addr + 4, sizeof(mgid));
 908
 909                 mcast = __ipoib_mcast_find(dev, &mgid);
 910                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 911                         struct ipoib_mcast *nmcast;
 912
 913                         /* ignore group which is directly joined by userspace */
 914                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 915                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 916                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 917                                                 mgid.raw);
 918                                 continue;
 919                         }
 920
 921                         /* Not found or send-only group, let's add a new entry */
 922                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 923                                         mgid.raw);
 924
 925                         nmcast = ipoib_mcast_alloc(dev);
 926                         if (!nmcast) {
 927                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 928                                 continue;
 929                         }
 930
 931                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 932
 933                         nmcast->mcmember.mgid = mgid;
 934
 935                         if (mcast) {
 936                                 /* Destroy the send only entry */
 937                                 list_move_tail(&mcast->list, &remove_list);
 938
 939                                 rb_replace_node(&mcast->rb_node,
 940                                                 &nmcast->rb_node,
 941                                                 &priv->multicast_tree);
 942                         } else
 943                                 __ipoib_mcast_add(dev, nmcast);
 944
 945                         list_add_tail(&nmcast->list, &priv->multicast_list);
 946                 }
 947
 948                 if (mcast)
 949                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 950         }
 951
 952         /* Remove all of the entries don't exist anymore */
 953         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 954                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 955                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 956                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 957                                         mcast->mcmember.mgid.raw);
 958
 959                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 960
 961                         /* Move to the remove list */
 962                         list_move_tail(&mcast->list, &remove_list);
 963                 }
 964         }
 965
 966         spin_unlock_irq(&priv->lock);
 967         netif_addr_unlock_bh(dev);
 968
 969         ipoib_mcast_remove_list(&remove_list);
 970
 971         /*
 972          * Double check that we are still up
 973          */
 974         if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 975                 spin_lock_irq(&priv->lock);
 976                 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
 977                 spin_unlock_irq(&priv->lock);
 978         }
 979 }
 980
 981 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 982
 983 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 984 {
 985         struct ipoib_mcast_iter *iter;
 986
 987         iter = kmalloc(sizeof(*iter), GFP_KERNEL);
 988         if (!iter)
 989                 return NULL;
 990
 991         iter->dev = dev;
 992         memset(iter->mgid.raw, 0, 16);
 993
 994         if (ipoib_mcast_iter_next(iter)) {
 995                 kfree(iter);
 996                 return NULL;
 997         }
 998
 999         return iter;
1000 }
1001
1002 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
1003 {
1004         struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
1005         struct rb_node *n;
1006         struct ipoib_mcast *mcast;
1007         int ret = 1;
1008
1009         spin_lock_irq(&priv->lock);
1010
1011         n = rb_first(&priv->multicast_tree);
1012
1013         while (n) {
1014                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
1015
1016                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
1017                            sizeof (union ib_gid)) < 0) {
1018                         iter->mgid      = mcast->mcmember.mgid;
1019                         iter->created   = mcast->created;
1020                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
1021                         iter->complete  = !!mcast->ah;
1022                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1023
1024                         ret = 0;
1025
1026                         break;
1027                 }
1028
1029                 n = rb_next(n);
1030         }
1031
1032         spin_unlock_irq(&priv->lock);
1033
1034         return ret;
1035 }
1036
1037 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1038                            union ib_gid *mgid,
1039                            unsigned long *created,
1040                            unsigned int *queuelen,
1041                            unsigned int *complete,
1042                            unsigned int *send_only)
1043 {
1044         *mgid      = iter->mgid;
1045         *created   = iter->created;
1046         *queuelen  = iter->queuelen;
1047         *complete  = iter->complete;
1048         *send_only = iter->send_only;
1049 }
1050
1051 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */