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 static DEFINE_MUTEX(mcast_mutex);
  59
  60 struct ipoib_mcast_iter {
  61         struct net_device *dev;
  62         union ib_gid       mgid;
  63         unsigned long      created;
  64         unsigned int       queuelen;
  65         unsigned int       complete;
  66         unsigned int       send_only;
  67 };
  68
  69 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  70 {
  71         struct net_device *dev = mcast->dev;
  72         int tx_dropped = 0;
  73
  74         ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
  75                         mcast->mcmember.mgid.raw);
  76
  77         /* remove all neigh connected to this mcast */
  78         ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw);
  79
  80         if (mcast->ah)
  81                 ipoib_put_ah(mcast->ah);
  82
  83         while (!skb_queue_empty(&mcast->pkt_queue)) {
  84                 ++tx_dropped;
  85                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
  86         }
  87
  88         netif_tx_lock_bh(dev);
  89         dev->stats.tx_dropped += tx_dropped;
  90         netif_tx_unlock_bh(dev);
  91
  92         kfree(mcast);
  93 }
  94
  95 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
  96                                              int can_sleep)
  97 {
  98         struct ipoib_mcast *mcast;
  99
 100         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 101         if (!mcast)
 102                 return NULL;
 103
 104         mcast->dev = dev;
 105         mcast->created = jiffies;
 106         mcast->backoff = 1;
 107
 108         INIT_LIST_HEAD(&mcast->list);
 109         INIT_LIST_HEAD(&mcast->neigh_list);
 110         skb_queue_head_init(&mcast->pkt_queue);
 111
 112         return mcast;
 113 }
 114
 115 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 116 {
 117         struct ipoib_dev_priv *priv = netdev_priv(dev);
 118         struct rb_node *n = priv->multicast_tree.rb_node;
 119
 120         while (n) {
 121                 struct ipoib_mcast *mcast;
 122                 int ret;
 123
 124                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 125
 126                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 127                              sizeof (union ib_gid));
 128                 if (ret < 0)
 129                         n = n->rb_left;
 130                 else if (ret > 0)
 131                         n = n->rb_right;
 132                 else
 133                         return mcast;
 134         }
 135
 136         return NULL;
 137 }
 138
 139 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 140 {
 141         struct ipoib_dev_priv *priv = netdev_priv(dev);
 142         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 143
 144         while (*n) {
 145                 struct ipoib_mcast *tmcast;
 146                 int ret;
 147
 148                 pn = *n;
 149                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 150
 151                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 152                              sizeof (union ib_gid));
 153                 if (ret < 0)
 154                         n = &pn->rb_left;
 155                 else if (ret > 0)
 156                         n = &pn->rb_right;
 157                 else
 158                         return -EEXIST;
 159         }
 160
 161         rb_link_node(&mcast->rb_node, pn, n);
 162         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 163
 164         return 0;
 165 }
 166
 167 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 168                                    struct ib_sa_mcmember_rec *mcmember)
 169 {
 170         struct net_device *dev = mcast->dev;
 171         struct ipoib_dev_priv *priv = netdev_priv(dev);
 172         struct ipoib_ah *ah;
 173         int ret;
 174         int set_qkey = 0;
 175
 176         mcast->mcmember = *mcmember;
 177
 178         /* Set the multicast MTU and cached Q_Key before we attach if it's
 179          * the broadcast group.
 180          */
 181         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 182                     sizeof (union ib_gid))) {
 183                 spin_lock_irq(&priv->lock);
 184                 if (!priv->broadcast) {
 185                         spin_unlock_irq(&priv->lock);
 186                         return -EAGAIN;
 187                 }
 188                 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 189                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 190                 spin_unlock_irq(&priv->lock);
 191                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 192                 set_qkey = 1;
 193         }
 194
 195         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 196                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 197                         ipoib_warn(priv, "multicast group %pI6 already attached\n",
 198                                    mcast->mcmember.mgid.raw);
 199
 200                         return 0;
 201                 }
 202
 203                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 204                                          &mcast->mcmember.mgid, set_qkey);
 205                 if (ret < 0) {
 206                         ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
 207                                    mcast->mcmember.mgid.raw);
 208
 209                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 210                         return ret;
 211                 }
 212         }
 213
 214         {
 215                 struct ib_ah_attr av = {
 216                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 217                         .port_num      = priv->port,
 218                         .sl            = mcast->mcmember.sl,
 219                         .ah_flags      = IB_AH_GRH,
 220                         .static_rate   = mcast->mcmember.rate,
 221                         .grh           = {
 222                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 223                                 .hop_limit     = mcast->mcmember.hop_limit,
 224                                 .sgid_index    = 0,
 225                                 .traffic_class = mcast->mcmember.traffic_class
 226                         }
 227                 };
 228                 av.grh.dgid = mcast->mcmember.mgid;
 229
 230                 ah = ipoib_create_ah(dev, priv->pd, &av);
 231                 if (IS_ERR(ah)) {
 232                         ipoib_warn(priv, "ib_address_create failed %ld\n",
 233                                 -PTR_ERR(ah));
 234                         /* use original error */
 235                         return PTR_ERR(ah);
 236                 } else {
 237                         spin_lock_irq(&priv->lock);
 238                         mcast->ah = ah;
 239                         spin_unlock_irq(&priv->lock);
 240
 241                         ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
 242                                         mcast->mcmember.mgid.raw,
 243                                         mcast->ah->ah,
 244                                         be16_to_cpu(mcast->mcmember.mlid),
 245                                         mcast->mcmember.sl);
 246                 }
 247         }
 248
 249         /* actually send any queued packets */
 250         netif_tx_lock_bh(dev);
 251         while (!skb_queue_empty(&mcast->pkt_queue)) {
 252                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 253
 254                 netif_tx_unlock_bh(dev);
 255
 256                 skb->dev = dev;
 257                 if (dev_queue_xmit(skb))
 258                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 259
 260                 netif_tx_lock_bh(dev);
 261         }
 262         netif_tx_unlock_bh(dev);
 263
 264         return 0;
 265 }
 266
 267 static int
 268 ipoib_mcast_sendonly_join_complete(int status,
 269                                    struct ib_sa_multicast *multicast)
 270 {
 271         struct ipoib_mcast *mcast = multicast->context;
 272         struct net_device *dev = mcast->dev;
 273
 274         /*
 275          * We have to take the mutex to force mcast_sendonly_join to
 276          * return from ib_sa_multicast_join and set mcast->mc to a
 277          * valid value.  Otherwise we were racing with ourselves in
 278          * that we might fail here, but get a valid return from
 279          * ib_sa_multicast_join after we had cleared mcast->mc here,
 280          * resulting in mis-matched joins and leaves and a deadlock
 281          */
 282         mutex_lock(&mcast_mutex);
 283
 284         /* We trap for port events ourselves. */
 285         if (status == -ENETRESET)
 286                 goto out;
 287
 288         if (!status)
 289                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 290
 291         if (status) {
 292                 if (mcast->logcount++ < 20)
 293                         ipoib_dbg_mcast(netdev_priv(dev), "sendonly multicast "
 294                                         "join failed for %pI6, status %d\n",
 295                                         mcast->mcmember.mgid.raw, status);
 296
 297                 /* Flush out any queued packets */
 298                 netif_tx_lock_bh(dev);
 299                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 300                         ++dev->stats.tx_dropped;
 301                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 302                 }
 303                 netif_tx_unlock_bh(dev);
 304         }
 305 out:
 306         clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 307         if (status)
 308                 mcast->mc = NULL;
 309         complete(&mcast->done);
 310         if (status == -ENETRESET)
 311                 status = 0;
 312         mutex_unlock(&mcast_mutex);
 313         return status;
 314 }
 315
 316 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 317 {
 318         struct net_device *dev = mcast->dev;
 319         struct ipoib_dev_priv *priv = netdev_priv(dev);
 320         struct ib_sa_mcmember_rec rec = {
 321 #if 0                           /* Some SMs don't support send-only yet */
 322                 .join_state = 4
 323 #else
 324                 .join_state = 1
 325 #endif
 326         };
 327         int ret = 0;
 328
 329         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 330                 ipoib_dbg_mcast(priv, "device shutting down, no sendonly "
 331                                 "multicast joins\n");
 332                 return -ENODEV;
 333         }
 334
 335         if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 336                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping "
 337                                 "sendonly join\n");
 338                 return -EBUSY;
 339         }
 340
 341         rec.mgid     = mcast->mcmember.mgid;
 342         rec.port_gid = priv->local_gid;
 343         rec.pkey     = cpu_to_be16(priv->pkey);
 344
 345         mutex_lock(&mcast_mutex);
 346         init_completion(&mcast->done);
 347         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 348         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 349                                          priv->port, &rec,
 350                                          IB_SA_MCMEMBER_REC_MGID        |
 351                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 352                                          IB_SA_MCMEMBER_REC_PKEY        |
 353                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 354                                          GFP_ATOMIC,
 355                                          ipoib_mcast_sendonly_join_complete,
 356                                          mcast);
 357         if (IS_ERR(mcast->mc)) {
 358                 ret = PTR_ERR(mcast->mc);
 359                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 360                 complete(&mcast->done);
 361                 ipoib_warn(priv, "ib_sa_join_multicast for sendonly join "
 362                            "failed (ret = %d)\n", ret);
 363         } else {
 364                 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting "
 365                                 "sendonly join\n", mcast->mcmember.mgid.raw);
 366         }
 367         mutex_unlock(&mcast_mutex);
 368
 369         return ret;
 370 }
 371
 372 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 373 {
 374         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 375                                                    carrier_on_task);
 376         struct ib_port_attr attr;
 377
 378         if (ib_query_port(priv->ca, priv->port, &attr) ||
 379             attr.state != IB_PORT_ACTIVE) {
 380                 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
 381                 return;
 382         }
 383
 384         /*
 385          * Take rtnl_lock to avoid racing with ipoib_stop() and
 386          * turning the carrier back on while a device is being
 387          * removed.  However, ipoib_stop() will attempt to flush
 388          * the workqueue while holding the rtnl lock, so loop
 389          * on trylock until either we get the lock or we see
 390          * FLAG_ADMIN_UP go away as that signals that we are bailing
 391          * and can safely ignore the carrier on work.
 392          */
 393         while (!rtnl_trylock()) {
 394                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 395                         return;
 396                 else
 397                         msleep(20);
 398         }
 399         if (!ipoib_cm_admin_enabled(priv->dev))
 400                 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
 401         netif_carrier_on(priv->dev);
 402         rtnl_unlock();
 403 }
 404
 405 static int ipoib_mcast_join_complete(int status,
 406                                      struct ib_sa_multicast *multicast)
 407 {
 408         struct ipoib_mcast *mcast = multicast->context;
 409         struct net_device *dev = mcast->dev;
 410         struct ipoib_dev_priv *priv = netdev_priv(dev);
 411
 412         ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
 413                         mcast->mcmember.mgid.raw, status);
 414
 415         /*
 416          * We have to take the mutex to force mcast_join to
 417          * return from ib_sa_multicast_join and set mcast->mc to a
 418          * valid value.  Otherwise we were racing with ourselves in
 419          * that we might fail here, but get a valid return from
 420          * ib_sa_multicast_join after we had cleared mcast->mc here,
 421          * resulting in mis-matched joins and leaves and a deadlock
 422          */
 423         mutex_lock(&mcast_mutex);
 424
 425         /* We trap for port events ourselves. */
 426         if (status == -ENETRESET)
 427                 goto out;
 428
 429         if (!status)
 430                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 431
 432         if (!status) {
 433                 mcast->backoff = 1;
 434                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 435                         queue_delayed_work(priv->wq, &priv->mcast_task, 0);
 436
 437                 /*
 438                  * Defer carrier on work to priv->wq to avoid a
 439                  * deadlock on rtnl_lock here.
 440                  */
 441                 if (mcast == priv->broadcast)
 442                         queue_work(priv->wq, &priv->carrier_on_task);
 443         } else {
 444                 if (mcast->logcount++ < 20) {
 445                         if (status == -ETIMEDOUT || status == -EAGAIN) {
 446                                 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
 447                                                 mcast->mcmember.mgid.raw, status);
 448                         } else {
 449                                 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
 450                                            mcast->mcmember.mgid.raw, status);
 451                         }
 452                 }
 453
 454                 mcast->backoff *= 2;
 455                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 456                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 457         }
 458 out:
 459         spin_lock_irq(&priv->lock);
 460         clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 461         if (status)
 462                 mcast->mc = NULL;
 463         complete(&mcast->done);
 464         if (status == -ENETRESET)
 465                 status = 0;
 466         if (status && test_bit(IPOIB_MCAST_RUN, &priv->flags))
 467                 queue_delayed_work(priv->wq, &priv->mcast_task,
 468                                    mcast->backoff * HZ);
 469         spin_unlock_irq(&priv->lock);
 470         mutex_unlock(&mcast_mutex);
 471
 472         return status;
 473 }
 474
 475 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 476                              int create)
 477 {
 478         struct ipoib_dev_priv *priv = netdev_priv(dev);
 479         struct ib_sa_mcmember_rec rec = {
 480                 .join_state = 1
 481         };
 482         ib_sa_comp_mask comp_mask;
 483         int ret = 0;
 484
 485         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 486
 487         rec.mgid     = mcast->mcmember.mgid;
 488         rec.port_gid = priv->local_gid;
 489         rec.pkey     = cpu_to_be16(priv->pkey);
 490
 491         comp_mask =
 492                 IB_SA_MCMEMBER_REC_MGID         |
 493                 IB_SA_MCMEMBER_REC_PORT_GID     |
 494                 IB_SA_MCMEMBER_REC_PKEY         |
 495                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 496
 497         if (create) {
 498                 comp_mask |=
 499                         IB_SA_MCMEMBER_REC_QKEY                 |
 500                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 501                         IB_SA_MCMEMBER_REC_MTU                  |
 502                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 503                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 504                         IB_SA_MCMEMBER_REC_RATE                 |
 505                         IB_SA_MCMEMBER_REC_SL                   |
 506                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 507                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 508
 509                 rec.qkey          = priv->broadcast->mcmember.qkey;
 510                 rec.mtu_selector  = IB_SA_EQ;
 511                 rec.mtu           = priv->broadcast->mcmember.mtu;
 512                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 513                 rec.rate_selector = IB_SA_EQ;
 514                 rec.rate          = priv->broadcast->mcmember.rate;
 515                 rec.sl            = priv->broadcast->mcmember.sl;
 516                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 517                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 518         }
 519
 520         mutex_lock(&mcast_mutex);
 521         init_completion(&mcast->done);
 522         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 523         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 524                                          &rec, comp_mask, GFP_KERNEL,
 525                                          ipoib_mcast_join_complete, mcast);
 526         if (IS_ERR(mcast->mc)) {
 527                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 528                 complete(&mcast->done);
 529                 ret = PTR_ERR(mcast->mc);
 530                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 531
 532                 mcast->backoff *= 2;
 533                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 534                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 535
 536                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 537                         queue_delayed_work(priv->wq, &priv->mcast_task,
 538                                            mcast->backoff * HZ);
 539         }
 540         mutex_unlock(&mcast_mutex);
 541 }
 542
 543 void ipoib_mcast_join_task(struct work_struct *work)
 544 {
 545         struct ipoib_dev_priv *priv =
 546                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 547         struct net_device *dev = priv->dev;
 548         struct ib_port_attr port_attr;
 549
 550         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 551                 return;
 552
 553         if (ib_query_port(priv->ca, priv->port, &port_attr) ||
 554             port_attr.state != IB_PORT_ACTIVE) {
 555                 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
 556                           port_attr.state);
 557                 return;
 558         }
 559         priv->local_lid = port_attr.lid;
 560
 561         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 562                 ipoib_warn(priv, "ib_query_gid() failed\n");
 563         else
 564                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 565
 566         if (!priv->broadcast) {
 567                 struct ipoib_mcast *broadcast;
 568
 569                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 570                         return;
 571
 572                 broadcast = ipoib_mcast_alloc(dev, 1);
 573                 if (!broadcast) {
 574                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 575                         mutex_lock(&mcast_mutex);
 576                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 577                                 queue_delayed_work(priv->wq, &priv->mcast_task,
 578                                                    HZ);
 579                         mutex_unlock(&mcast_mutex);
 580                         return;
 581                 }
 582
 583                 spin_lock_irq(&priv->lock);
 584                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 585                        sizeof (union ib_gid));
 586                 priv->broadcast = broadcast;
 587
 588                 __ipoib_mcast_add(dev, priv->broadcast);
 589                 spin_unlock_irq(&priv->lock);
 590         }
 591
 592         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 593                 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
 594                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 595                         ipoib_mcast_join(dev, priv->broadcast, 0);
 596                 return;
 597         }
 598
 599         while (1) {
 600                 struct ipoib_mcast *mcast = NULL;
 601
 602                 /*
 603                  * Need the mutex so our flags are consistent, need the
 604                  * priv->lock so we don't race with list removals in either
 605                  * mcast_dev_flush or mcast_restart_task
 606                  */
 607                 mutex_lock(&mcast_mutex);
 608                 spin_lock_irq(&priv->lock);
 609                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 610                         if (IS_ERR_OR_NULL(mcast->mc) &&
 611                             !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
 612                             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 613                                 /* Found the next unjoined group */
 614                                 break;
 615                         }
 616                 }
 617                 spin_unlock_irq(&priv->lock);
 618                 mutex_unlock(&mcast_mutex);
 619
 620                 if (&mcast->list == &priv->multicast_list) {
 621                         /* All done */
 622                         break;
 623                 }
 624
 625                 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 626                         ipoib_mcast_sendonly_join(mcast);
 627                 else
 628                         ipoib_mcast_join(dev, mcast, 1);
 629                 return;
 630         }
 631
 632         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 633
 634         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 635 }
 636
 637 int ipoib_mcast_start_thread(struct net_device *dev)
 638 {
 639         struct ipoib_dev_priv *priv = netdev_priv(dev);
 640
 641         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 642
 643         mutex_lock(&mcast_mutex);
 644         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 645                 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
 646         mutex_unlock(&mcast_mutex);
 647
 648         return 0;
 649 }
 650
 651 int ipoib_mcast_stop_thread(struct net_device *dev)
 652 {
 653         struct ipoib_dev_priv *priv = netdev_priv(dev);
 654
 655         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 656
 657         mutex_lock(&mcast_mutex);
 658         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 659         cancel_delayed_work(&priv->mcast_task);
 660         mutex_unlock(&mcast_mutex);
 661
 662         flush_workqueue(priv->wq);
 663
 664         return 0;
 665 }
 666
 667 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 668 {
 669         struct ipoib_dev_priv *priv = netdev_priv(dev);
 670         int ret = 0;
 671
 672         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 673                 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
 674
 675         if (!IS_ERR_OR_NULL(mcast->mc))
 676                 ib_sa_free_multicast(mcast->mc);
 677
 678         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 679                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 680                                 mcast->mcmember.mgid.raw);
 681
 682                 /* Remove ourselves from the multicast group */
 683                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 684                                       be16_to_cpu(mcast->mcmember.mlid));
 685                 if (ret)
 686                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 687         }
 688
 689         return 0;
 690 }
 691
 692 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
 693 {
 694         struct ipoib_dev_priv *priv = netdev_priv(dev);
 695         struct ipoib_mcast *mcast;
 696         unsigned long flags;
 697         void *mgid = daddr + 4;
 698
 699         spin_lock_irqsave(&priv->lock, flags);
 700
 701         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 702             !priv->broadcast                                    ||
 703             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 704                 ++dev->stats.tx_dropped;
 705                 dev_kfree_skb_any(skb);
 706                 goto unlock;
 707         }
 708
 709         mcast = __ipoib_mcast_find(dev, mgid);
 710         if (!mcast) {
 711                 /* Let's create a new send only group now */
 712                 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 713                                 mgid);
 714
 715                 mcast = ipoib_mcast_alloc(dev, 0);
 716                 if (!mcast) {
 717                         ipoib_warn(priv, "unable to allocate memory for "
 718                                    "multicast structure\n");
 719                         ++dev->stats.tx_dropped;
 720                         dev_kfree_skb_any(skb);
 721                         goto out;
 722                 }
 723
 724                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 725                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 726                 __ipoib_mcast_add(dev, mcast);
 727                 list_add_tail(&mcast->list, &priv->multicast_list);
 728                 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 729                         queue_delayed_work(priv->wq, &priv->mcast_task, 0);
 730         }
 731
 732         if (!mcast->ah) {
 733                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 734                         skb_queue_tail(&mcast->pkt_queue, skb);
 735                 else {
 736                         ++dev->stats.tx_dropped;
 737                         dev_kfree_skb_any(skb);
 738                 }
 739
 740                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 741                         ipoib_dbg_mcast(priv, "no address vector, "
 742                                         "but multicast join already started\n");
 743
 744                 /*
 745                  * If lookup completes between here and out:, don't
 746                  * want to send packet twice.
 747                  */
 748                 mcast = NULL;
 749         }
 750
 751 out:
 752         if (mcast && mcast->ah) {
 753                 struct ipoib_neigh *neigh;
 754
 755                 spin_unlock_irqrestore(&priv->lock, flags);
 756                 neigh = ipoib_neigh_get(dev, daddr);
 757                 spin_lock_irqsave(&priv->lock, flags);
 758                 if (!neigh) {
 759                         neigh = ipoib_neigh_alloc(daddr, dev);
 760                         if (neigh) {
 761                                 kref_get(&mcast->ah->ref);
 762                                 neigh->ah       = mcast->ah;
 763                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 764                         }
 765                 }
 766                 spin_unlock_irqrestore(&priv->lock, flags);
 767                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 768                 if (neigh)
 769                         ipoib_neigh_put(neigh);
 770                 return;
 771         }
 772
 773 unlock:
 774         spin_unlock_irqrestore(&priv->lock, flags);
 775 }
 776
 777 void ipoib_mcast_dev_flush(struct net_device *dev)
 778 {
 779         struct ipoib_dev_priv *priv = netdev_priv(dev);
 780         LIST_HEAD(remove_list);
 781         struct ipoib_mcast *mcast, *tmcast;
 782         unsigned long flags;
 783
 784         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 785
 786         spin_lock_irqsave(&priv->lock, flags);
 787
 788         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 789                 list_del(&mcast->list);
 790                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 791                 list_add_tail(&mcast->list, &remove_list);
 792         }
 793
 794         if (priv->broadcast) {
 795                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 796                 list_add_tail(&priv->broadcast->list, &remove_list);
 797                 priv->broadcast = NULL;
 798         }
 799
 800         spin_unlock_irqrestore(&priv->lock, flags);
 801
 802         /*
 803          * make sure the in-flight joins have finished before we attempt
 804          * to leave
 805          */
 806         list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
 807                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 808                         wait_for_completion(&mcast->done);
 809
 810         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 811                 ipoib_mcast_leave(dev, mcast);
 812                 ipoib_mcast_free(mcast);
 813         }
 814 }
 815
 816 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
 817 {
 818         /* reserved QPN, prefix, scope */
 819         if (memcmp(addr, broadcast, 6))
 820                 return 0;
 821         /* signature lower, pkey */
 822         if (memcmp(addr + 7, broadcast + 7, 3))
 823                 return 0;
 824         return 1;
 825 }
 826
 827 void ipoib_mcast_restart_task(struct work_struct *work)
 828 {
 829         struct ipoib_dev_priv *priv =
 830                 container_of(work, struct ipoib_dev_priv, restart_task);
 831         struct net_device *dev = priv->dev;
 832         struct netdev_hw_addr *ha;
 833         struct ipoib_mcast *mcast, *tmcast;
 834         LIST_HEAD(remove_list);
 835         unsigned long flags;
 836         struct ib_sa_mcmember_rec rec;
 837
 838         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 839
 840         local_irq_save(flags);
 841         netif_addr_lock(dev);
 842         spin_lock(&priv->lock);
 843
 844         /*
 845          * Unfortunately, the networking core only gives us a list of all of
 846          * the multicast hardware addresses. We need to figure out which ones
 847          * are new and which ones have been removed
 848          */
 849
 850         /* Clear out the found flag */
 851         list_for_each_entry(mcast, &priv->multicast_list, list)
 852                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 853
 854         /* Mark all of the entries that are found or don't exist */
 855         netdev_for_each_mc_addr(ha, dev) {
 856                 union ib_gid mgid;
 857
 858                 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
 859                         continue;
 860
 861                 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
 862
 863                 mcast = __ipoib_mcast_find(dev, &mgid);
 864                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 865                         struct ipoib_mcast *nmcast;
 866
 867                         /* ignore group which is directly joined by userspace */
 868                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 869                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 870                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 871                                                 mgid.raw);
 872                                 continue;
 873                         }
 874
 875                         /* Not found or send-only group, let's add a new entry */
 876                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 877                                         mgid.raw);
 878
 879                         nmcast = ipoib_mcast_alloc(dev, 0);
 880                         if (!nmcast) {
 881                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 882                                 continue;
 883                         }
 884
 885                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 886
 887                         nmcast->mcmember.mgid = mgid;
 888
 889                         if (mcast) {
 890                                 /* Destroy the send only entry */
 891                                 list_move_tail(&mcast->list, &remove_list);
 892
 893                                 rb_replace_node(&mcast->rb_node,
 894                                                 &nmcast->rb_node,
 895                                                 &priv->multicast_tree);
 896                         } else
 897                                 __ipoib_mcast_add(dev, nmcast);
 898
 899                         list_add_tail(&nmcast->list, &priv->multicast_list);
 900                 }
 901
 902                 if (mcast)
 903                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 904         }
 905
 906         /* Remove all of the entries don't exist anymore */
 907         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 908                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 909                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 910                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 911                                         mcast->mcmember.mgid.raw);
 912
 913                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 914
 915                         /* Move to the remove list */
 916                         list_move_tail(&mcast->list, &remove_list);
 917                 }
 918         }
 919
 920         spin_unlock(&priv->lock);
 921         netif_addr_unlock(dev);
 922         local_irq_restore(flags);
 923
 924         /*
 925          * make sure the in-flight joins have finished before we attempt
 926          * to leave
 927          */
 928         list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
 929                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 930                         wait_for_completion(&mcast->done);
 931
 932         /*
 933          * We have to cancel outside of the spinlock, but we have to
 934          * take the rtnl lock or else we race with the removal of
 935          * entries from the remove list in mcast_dev_flush as part
 936          * of ipoib_stop().  We detect the drop of the ADMIN_UP flag
 937          * to signal that we have hit this particular race, and we
 938          * return since we know we don't need to do anything else
 939          * anyway.
 940          */
 941         while (!rtnl_trylock()) {
 942                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 943                         return;
 944                 else
 945                         msleep(20);
 946         }
 947         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 948                 ipoib_mcast_leave(mcast->dev, mcast);
 949                 ipoib_mcast_free(mcast);
 950         }
 951         /*
 952          * Restart our join task if needed
 953          */
 954         ipoib_mcast_start_thread(dev);
 955         rtnl_unlock();
 956 }
 957
 958 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 959
 960 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 961 {
 962         struct ipoib_mcast_iter *iter;
 963
 964         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 965         if (!iter)
 966                 return NULL;
 967
 968         iter->dev = dev;
 969         memset(iter->mgid.raw, 0, 16);
 970
 971         if (ipoib_mcast_iter_next(iter)) {
 972                 kfree(iter);
 973                 return NULL;
 974         }
 975
 976         return iter;
 977 }
 978
 979 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 980 {
 981         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 982         struct rb_node *n;
 983         struct ipoib_mcast *mcast;
 984         int ret = 1;
 985
 986         spin_lock_irq(&priv->lock);
 987
 988         n = rb_first(&priv->multicast_tree);
 989
 990         while (n) {
 991                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 992
 993                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 994                            sizeof (union ib_gid)) < 0) {
 995                         iter->mgid      = mcast->mcmember.mgid;
 996                         iter->created   = mcast->created;
 997                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 998                         iter->complete  = !!mcast->ah;
 999                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1000
1001                         ret = 0;
1002
1003                         break;
1004                 }
1005
1006                 n = rb_next(n);
1007         }
1008
1009         spin_unlock_irq(&priv->lock);
1010
1011         return ret;
1012 }
1013
1014 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1015                            union ib_gid *mgid,
1016                            unsigned long *created,
1017                            unsigned int *queuelen,
1018                            unsigned int *complete,
1019                            unsigned int *send_only)
1020 {
1021         *mgid      = iter->mgid;
1022         *created   = iter->created;
1023         *queuelen  = iter->queuelen;
1024         *complete  = iter->complete;
1025         *send_only = iter->send_only;
1026 }
1027
1028 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */