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  * $Id: ipoib_multicast.c 1362 2004-12-18 15:56:29Z roland $
  35  */
  36
  37 #include <linux/skbuff.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/ip.h>
  40 #include <linux/in.h>
  41 #include <linux/igmp.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/delay.h>
  44 #include <linux/completion.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 /* Used for all multicast joins (broadcast, IPv4 mcast and IPv6 mcast) */
  61 struct ipoib_mcast {
  62         struct ib_sa_mcmember_rec mcmember;
  63         struct ipoib_ah          *ah;
  64
  65         struct rb_node    rb_node;
  66         struct list_head  list;
  67         struct completion done;
  68
  69         int                 query_id;
  70         struct ib_sa_query *query;
  71
  72         unsigned long created;
  73         unsigned long backoff;
  74
  75         unsigned long flags;
  76         unsigned char logcount;
  77
  78         struct list_head  neigh_list;
  79
  80         struct sk_buff_head pkt_queue;
  81
  82         struct net_device *dev;
  83 };
  84
  85 struct ipoib_mcast_iter {
  86         struct net_device *dev;
  87         union ib_gid       mgid;
  88         unsigned long      created;
  89         unsigned int       queuelen;
  90         unsigned int       complete;
  91         unsigned int       send_only;
  92 };
  93
  94 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  95 {
  96         struct net_device *dev = mcast->dev;
  97         struct ipoib_dev_priv *priv = netdev_priv(dev);
  98         struct ipoib_neigh *neigh, *tmp;
  99         unsigned long flags;
 100         int tx_dropped = 0;
 101
 102         ipoib_dbg_mcast(netdev_priv(dev),
 103                         "deleting multicast group " IPOIB_GID_FMT "\n",
 104                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 105
 106         spin_lock_irqsave(&priv->lock, flags);
 107
 108         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
 109                 /*
 110                  * It's safe to call ipoib_put_ah() inside priv->lock
 111                  * here, because we know that mcast->ah will always
 112                  * hold one more reference, so ipoib_put_ah() will
 113                  * never do more than decrement the ref count.
 114                  */
 115                 if (neigh->ah)
 116                         ipoib_put_ah(neigh->ah);
 117                 ipoib_neigh_free(dev, neigh);
 118         }
 119
 120         spin_unlock_irqrestore(&priv->lock, flags);
 121
 122         if (mcast->ah)
 123                 ipoib_put_ah(mcast->ah);
 124
 125         while (!skb_queue_empty(&mcast->pkt_queue)) {
 126                 ++tx_dropped;
 127                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 128         }
 129
 130         spin_lock_irqsave(&priv->tx_lock, flags);
 131         priv->stats.tx_dropped += tx_dropped;
 132         spin_unlock_irqrestore(&priv->tx_lock, flags);
 133
 134         kfree(mcast);
 135 }
 136
 137 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 138                                              int can_sleep)
 139 {
 140         struct ipoib_mcast *mcast;
 141
 142         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 143         if (!mcast)
 144                 return NULL;
 145
 146         mcast->dev = dev;
 147         mcast->created = jiffies;
 148         mcast->backoff = 1;
 149
 150         INIT_LIST_HEAD(&mcast->list);
 151         INIT_LIST_HEAD(&mcast->neigh_list);
 152         skb_queue_head_init(&mcast->pkt_queue);
 153
 154         return mcast;
 155 }
 156
 157 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 158 {
 159         struct ipoib_dev_priv *priv = netdev_priv(dev);
 160         struct rb_node *n = priv->multicast_tree.rb_node;
 161
 162         while (n) {
 163                 struct ipoib_mcast *mcast;
 164                 int ret;
 165
 166                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 167
 168                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 169                              sizeof (union ib_gid));
 170                 if (ret < 0)
 171                         n = n->rb_left;
 172                 else if (ret > 0)
 173                         n = n->rb_right;
 174                 else
 175                         return mcast;
 176         }
 177
 178         return NULL;
 179 }
 180
 181 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 182 {
 183         struct ipoib_dev_priv *priv = netdev_priv(dev);
 184         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 185
 186         while (*n) {
 187                 struct ipoib_mcast *tmcast;
 188                 int ret;
 189
 190                 pn = *n;
 191                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 192
 193                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 194                              sizeof (union ib_gid));
 195                 if (ret < 0)
 196                         n = &pn->rb_left;
 197                 else if (ret > 0)
 198                         n = &pn->rb_right;
 199                 else
 200                         return -EEXIST;
 201         }
 202
 203         rb_link_node(&mcast->rb_node, pn, n);
 204         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 205
 206         return 0;
 207 }
 208
 209 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 210                                    struct ib_sa_mcmember_rec *mcmember)
 211 {
 212         struct net_device *dev = mcast->dev;
 213         struct ipoib_dev_priv *priv = netdev_priv(dev);
 214         struct ipoib_ah *ah;
 215         int ret;
 216
 217         mcast->mcmember = *mcmember;
 218
 219         /* Set the cached Q_Key before we attach if it's the broadcast group */
 220         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 221                     sizeof (union ib_gid))) {
 222                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 223                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 224         }
 225
 226         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 227                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 228                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 229                                    " already attached\n",
 230                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 231
 232                         return 0;
 233                 }
 234
 235                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 236                                          &mcast->mcmember.mgid);
 237                 if (ret < 0) {
 238                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 239                                    IPOIB_GID_FMT "\n",
 240                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 241
 242                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 243                         return ret;
 244                 }
 245         }
 246
 247         {
 248                 struct ib_ah_attr av = {
 249                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 250                         .port_num      = priv->port,
 251                         .sl            = mcast->mcmember.sl,
 252                         .ah_flags      = IB_AH_GRH,
 253                         .static_rate   = mcast->mcmember.rate,
 254                         .grh           = {
 255                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 256                                 .hop_limit     = mcast->mcmember.hop_limit,
 257                                 .sgid_index    = 0,
 258                                 .traffic_class = mcast->mcmember.traffic_class
 259                         }
 260                 };
 261                 av.grh.dgid = mcast->mcmember.mgid;
 262
 263                 ah = ipoib_create_ah(dev, priv->pd, &av);
 264                 if (!ah) {
 265                         ipoib_warn(priv, "ib_address_create failed\n");
 266                 } else {
 267                         spin_lock_irq(&priv->lock);
 268                         mcast->ah = ah;
 269                         spin_unlock_irq(&priv->lock);
 270
 271                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 272                                         " AV %p, LID 0x%04x, SL %d\n",
 273                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 274                                         mcast->ah->ah,
 275                                         be16_to_cpu(mcast->mcmember.mlid),
 276                                         mcast->mcmember.sl);
 277                 }
 278         }
 279
 280         /* actually send any queued packets */
 281         spin_lock_irq(&priv->tx_lock);
 282         while (!skb_queue_empty(&mcast->pkt_queue)) {
 283                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 284                 spin_unlock_irq(&priv->tx_lock);
 285
 286                 skb->dev = dev;
 287
 288                 if (!skb->dst || !skb->dst->neighbour) {
 289                         /* put pseudoheader back on for next time */
 290                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 291                 }
 292
 293                 if (dev_queue_xmit(skb))
 294                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 295                 spin_lock_irq(&priv->tx_lock);
 296         }
 297         spin_unlock_irq(&priv->tx_lock);
 298
 299         return 0;
 300 }
 301
 302 static void
 303 ipoib_mcast_sendonly_join_complete(int status,
 304                                    struct ib_sa_mcmember_rec *mcmember,
 305                                    void *mcast_ptr)
 306 {
 307         struct ipoib_mcast *mcast = mcast_ptr;
 308         struct net_device *dev = mcast->dev;
 309         struct ipoib_dev_priv *priv = netdev_priv(dev);
 310
 311         if (!status)
 312                 ipoib_mcast_join_finish(mcast, mcmember);
 313         else {
 314                 if (mcast->logcount++ < 20)
 315                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 316                                         IPOIB_GID_FMT ", status %d\n",
 317                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 318
 319                 /* Flush out any queued packets */
 320                 spin_lock_irq(&priv->tx_lock);
 321                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 322                         ++priv->stats.tx_dropped;
 323                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 324                 }
 325                 spin_unlock_irq(&priv->tx_lock);
 326
 327                 /* Clear the busy flag so we try again */
 328                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 329                 mcast->query = NULL;
 330         }
 331
 332         complete(&mcast->done);
 333 }
 334
 335 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 336 {
 337         struct net_device *dev = mcast->dev;
 338         struct ipoib_dev_priv *priv = netdev_priv(dev);
 339         struct ib_sa_mcmember_rec rec = {
 340 #if 0                           /* Some SMs don't support send-only yet */
 341                 .join_state = 4
 342 #else
 343                 .join_state = 1
 344 #endif
 345         };
 346         int ret = 0;
 347
 348         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 349                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 350                 return -ENODEV;
 351         }
 352
 353         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 354                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 355                 return -EBUSY;
 356         }
 357
 358         rec.mgid     = mcast->mcmember.mgid;
 359         rec.port_gid = priv->local_gid;
 360         rec.pkey     = cpu_to_be16(priv->pkey);
 361
 362         init_completion(&mcast->done);
 363
 364         ret = ib_sa_mcmember_rec_set(&ipoib_sa_client, priv->ca, priv->port, &rec,
 365                                      IB_SA_MCMEMBER_REC_MGID            |
 366                                      IB_SA_MCMEMBER_REC_PORT_GID        |
 367                                      IB_SA_MCMEMBER_REC_PKEY            |
 368                                      IB_SA_MCMEMBER_REC_JOIN_STATE,
 369                                      1000, GFP_ATOMIC,
 370                                      ipoib_mcast_sendonly_join_complete,
 371                                      mcast, &mcast->query);
 372         if (ret < 0) {
 373                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed (ret = %d)\n",
 374                            ret);
 375         } else {
 376                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 377                                 ", starting join\n",
 378                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 379
 380                 mcast->query_id = ret;
 381         }
 382
 383         return ret;
 384 }
 385
 386 static void ipoib_mcast_join_complete(int status,
 387                                       struct ib_sa_mcmember_rec *mcmember,
 388                                       void *mcast_ptr)
 389 {
 390         struct ipoib_mcast *mcast = mcast_ptr;
 391         struct net_device *dev = mcast->dev;
 392         struct ipoib_dev_priv *priv = netdev_priv(dev);
 393
 394         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 395                         " (status %d)\n",
 396                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 397
 398         if (!status && !ipoib_mcast_join_finish(mcast, mcmember)) {
 399                 mcast->backoff = 1;
 400                 mutex_lock(&mcast_mutex);
 401                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 402                         queue_delayed_work(ipoib_workqueue,
 403                                            &priv->mcast_task, 0);
 404                 mutex_unlock(&mcast_mutex);
 405                 complete(&mcast->done);
 406                 return;
 407         }
 408
 409         if (status == -EINTR) {
 410                 complete(&mcast->done);
 411                 return;
 412         }
 413
 414         if (status && mcast->logcount++ < 20) {
 415                 if (status == -ETIMEDOUT || status == -EINTR) {
 416                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 417                                         ", status %d\n",
 418                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 419                                         status);
 420                 } else {
 421                         ipoib_warn(priv, "multicast join failed for "
 422                                    IPOIB_GID_FMT ", status %d\n",
 423                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 424                                    status);
 425                 }
 426         }
 427
 428         mcast->backoff *= 2;
 429         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 430                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 431
 432         mutex_lock(&mcast_mutex);
 433
 434         spin_lock_irq(&priv->lock);
 435         mcast->query = NULL;
 436
 437         if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
 438                 if (status == -ETIMEDOUT)
 439                         queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 440                                            0);
 441                 else
 442                         queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 443                                            mcast->backoff * HZ);
 444         } else
 445                 complete(&mcast->done);
 446         spin_unlock_irq(&priv->lock);
 447         mutex_unlock(&mcast_mutex);
 448
 449         return;
 450 }
 451
 452 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 453                              int create)
 454 {
 455         struct ipoib_dev_priv *priv = netdev_priv(dev);
 456         struct ib_sa_mcmember_rec rec = {
 457                 .join_state = 1
 458         };
 459         ib_sa_comp_mask comp_mask;
 460         int ret = 0;
 461
 462         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 463                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 464
 465         rec.mgid     = mcast->mcmember.mgid;
 466         rec.port_gid = priv->local_gid;
 467         rec.pkey     = cpu_to_be16(priv->pkey);
 468
 469         comp_mask =
 470                 IB_SA_MCMEMBER_REC_MGID         |
 471                 IB_SA_MCMEMBER_REC_PORT_GID     |
 472                 IB_SA_MCMEMBER_REC_PKEY         |
 473                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 474
 475         if (create) {
 476                 comp_mask |=
 477                         IB_SA_MCMEMBER_REC_QKEY                 |
 478                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 479                         IB_SA_MCMEMBER_REC_MTU                  |
 480                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 481                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 482                         IB_SA_MCMEMBER_REC_RATE                 |
 483                         IB_SA_MCMEMBER_REC_SL                   |
 484                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 485                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 486
 487                 rec.qkey          = priv->broadcast->mcmember.qkey;
 488                 rec.mtu_selector  = IB_SA_EQ;
 489                 rec.mtu           = priv->broadcast->mcmember.mtu;
 490                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 491                 rec.rate_selector = IB_SA_EQ;
 492                 rec.rate          = priv->broadcast->mcmember.rate;
 493                 rec.sl            = priv->broadcast->mcmember.sl;
 494                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 495                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 496         }
 497
 498         init_completion(&mcast->done);
 499
 500         ret = ib_sa_mcmember_rec_set(&ipoib_sa_client, priv->ca, priv->port,
 501                                      &rec, comp_mask, mcast->backoff * 1000,
 502                                      GFP_ATOMIC, ipoib_mcast_join_complete,
 503                                      mcast, &mcast->query);
 504
 505         if (ret < 0) {
 506                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
 507
 508                 mcast->backoff *= 2;
 509                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 510                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 511
 512                 mutex_lock(&mcast_mutex);
 513                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 514                         queue_delayed_work(ipoib_workqueue,
 515                                            &priv->mcast_task,
 516                                            mcast->backoff * HZ);
 517                 mutex_unlock(&mcast_mutex);
 518         } else
 519                 mcast->query_id = ret;
 520 }
 521
 522 void ipoib_mcast_join_task(struct work_struct *work)
 523 {
 524         struct ipoib_dev_priv *priv =
 525                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 526         struct net_device *dev = priv->dev;
 527
 528         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 529                 return;
 530
 531         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 532                 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
 533         else
 534                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 535
 536         {
 537                 struct ib_port_attr attr;
 538
 539                 if (!ib_query_port(priv->ca, priv->port, &attr)) {
 540                         priv->local_lid  = attr.lid;
 541                         priv->local_rate = attr.active_speed *
 542                                 ib_width_enum_to_int(attr.active_width);
 543                 } else
 544                 ipoib_warn(priv, "ib_query_port failed\n");
 545         }
 546
 547         if (!priv->broadcast) {
 548                 struct ipoib_mcast *broadcast;
 549
 550                 broadcast = ipoib_mcast_alloc(dev, 1);
 551                 if (!broadcast) {
 552                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 553                         mutex_lock(&mcast_mutex);
 554                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 555                                 queue_delayed_work(ipoib_workqueue,
 556                                                    &priv->mcast_task, HZ);
 557                         mutex_unlock(&mcast_mutex);
 558                         return;
 559                 }
 560
 561                 spin_lock_irq(&priv->lock);
 562                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 563                        sizeof (union ib_gid));
 564                 priv->broadcast = broadcast;
 565
 566                 __ipoib_mcast_add(dev, priv->broadcast);
 567                 spin_unlock_irq(&priv->lock);
 568         }
 569
 570         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 571                 ipoib_mcast_join(dev, priv->broadcast, 0);
 572                 return;
 573         }
 574
 575         while (1) {
 576                 struct ipoib_mcast *mcast = NULL;
 577
 578                 spin_lock_irq(&priv->lock);
 579                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 580                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 581                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 582                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 583                                 /* Found the next unjoined group */
 584                                 break;
 585                         }
 586                 }
 587                 spin_unlock_irq(&priv->lock);
 588
 589                 if (&mcast->list == &priv->multicast_list) {
 590                         /* All done */
 591                         break;
 592                 }
 593
 594                 ipoib_mcast_join(dev, mcast, 1);
 595                 return;
 596         }
 597
 598         priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
 599                 IPOIB_ENCAP_LEN;
 600
 601         if (!ipoib_cm_admin_enabled(dev))
 602                 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 603
 604         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 605
 606         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 607         netif_carrier_on(dev);
 608 }
 609
 610 int ipoib_mcast_start_thread(struct net_device *dev)
 611 {
 612         struct ipoib_dev_priv *priv = netdev_priv(dev);
 613
 614         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 615
 616         mutex_lock(&mcast_mutex);
 617         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 618                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 619         mutex_unlock(&mcast_mutex);
 620
 621         spin_lock_irq(&priv->lock);
 622         set_bit(IPOIB_MCAST_STARTED, &priv->flags);
 623         spin_unlock_irq(&priv->lock);
 624
 625         return 0;
 626 }
 627
 628 static void wait_for_mcast_join(struct ipoib_dev_priv *priv,
 629                                 struct ipoib_mcast *mcast)
 630 {
 631         spin_lock_irq(&priv->lock);
 632         if (mcast && mcast->query) {
 633                 ib_sa_cancel_query(mcast->query_id, mcast->query);
 634                 mcast->query = NULL;
 635                 spin_unlock_irq(&priv->lock);
 636                 ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
 637                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 638                 wait_for_completion(&mcast->done);
 639         }
 640         else
 641                 spin_unlock_irq(&priv->lock);
 642 }
 643
 644 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 645 {
 646         struct ipoib_dev_priv *priv = netdev_priv(dev);
 647         struct ipoib_mcast *mcast;
 648
 649         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 650
 651         spin_lock_irq(&priv->lock);
 652         clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
 653         spin_unlock_irq(&priv->lock);
 654
 655         mutex_lock(&mcast_mutex);
 656         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 657         cancel_delayed_work(&priv->mcast_task);
 658         mutex_unlock(&mcast_mutex);
 659
 660         if (flush)
 661                 flush_workqueue(ipoib_workqueue);
 662
 663         wait_for_mcast_join(priv, priv->broadcast);
 664
 665         list_for_each_entry(mcast, &priv->multicast_list, list)
 666                 wait_for_mcast_join(priv, mcast);
 667
 668         return 0;
 669 }
 670
 671 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 672 {
 673         struct ipoib_dev_priv *priv = netdev_priv(dev);
 674         struct ib_sa_mcmember_rec rec = {
 675                 .join_state = 1
 676         };
 677         int ret = 0;
 678
 679         if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
 680                 return 0;
 681
 682         ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 683                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 684
 685         rec.mgid     = mcast->mcmember.mgid;
 686         rec.port_gid = priv->local_gid;
 687         rec.pkey     = cpu_to_be16(priv->pkey);
 688
 689         /* Remove ourselves from the multicast group */
 690         ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
 691                                  &mcast->mcmember.mgid);
 692         if (ret)
 693                 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
 694
 695         /*
 696          * Just make one shot at leaving and don't wait for a reply;
 697          * if we fail, too bad.
 698          */
 699         ret = ib_sa_mcmember_rec_delete(&ipoib_sa_client, priv->ca, priv->port, &rec,
 700                                         IB_SA_MCMEMBER_REC_MGID         |
 701                                         IB_SA_MCMEMBER_REC_PORT_GID     |
 702                                         IB_SA_MCMEMBER_REC_PKEY         |
 703                                         IB_SA_MCMEMBER_REC_JOIN_STATE,
 704                                         0, GFP_ATOMIC, NULL,
 705                                         mcast, &mcast->query);
 706         if (ret < 0)
 707                 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
 708                            "for leave (result = %d)\n", ret);
 709
 710         return 0;
 711 }
 712
 713 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 714 {
 715         struct ipoib_dev_priv *priv = netdev_priv(dev);
 716         struct ipoib_mcast *mcast;
 717
 718         /*
 719          * We can only be called from ipoib_start_xmit, so we're
 720          * inside tx_lock -- no need to save/restore flags.
 721          */
 722         spin_lock(&priv->lock);
 723
 724         if (!test_bit(IPOIB_MCAST_STARTED, &priv->flags)        ||
 725             !priv->broadcast                                    ||
 726             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 727                 ++priv->stats.tx_dropped;
 728                 dev_kfree_skb_any(skb);
 729                 goto unlock;
 730         }
 731
 732         mcast = __ipoib_mcast_find(dev, mgid);
 733         if (!mcast) {
 734                 /* Let's create a new send only group now */
 735                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 736                                 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
 737
 738                 mcast = ipoib_mcast_alloc(dev, 0);
 739                 if (!mcast) {
 740                         ipoib_warn(priv, "unable to allocate memory for "
 741                                    "multicast structure\n");
 742                         ++priv->stats.tx_dropped;
 743                         dev_kfree_skb_any(skb);
 744                         goto out;
 745                 }
 746
 747                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 748                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 749                 __ipoib_mcast_add(dev, mcast);
 750                 list_add_tail(&mcast->list, &priv->multicast_list);
 751         }
 752
 753         if (!mcast->ah) {
 754                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 755                         skb_queue_tail(&mcast->pkt_queue, skb);
 756                 else {
 757                         ++priv->stats.tx_dropped;
 758                         dev_kfree_skb_any(skb);
 759                 }
 760
 761                 if (mcast->query)
 762                         ipoib_dbg_mcast(priv, "no address vector, "
 763                                         "but multicast join already started\n");
 764                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 765                         ipoib_mcast_sendonly_join(mcast);
 766
 767                 /*
 768                  * If lookup completes between here and out:, don't
 769                  * want to send packet twice.
 770                  */
 771                 mcast = NULL;
 772         }
 773
 774 out:
 775         if (mcast && mcast->ah) {
 776                 if (skb->dst            &&
 777                     skb->dst->neighbour &&
 778                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 779                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour);
 780
 781                         if (neigh) {
 782                                 kref_get(&mcast->ah->ref);
 783                                 neigh->ah       = mcast->ah;
 784                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 785                         }
 786                 }
 787
 788                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 789         }
 790
 791 unlock:
 792         spin_unlock(&priv->lock);
 793 }
 794
 795 void ipoib_mcast_dev_flush(struct net_device *dev)
 796 {
 797         struct ipoib_dev_priv *priv = netdev_priv(dev);
 798         LIST_HEAD(remove_list);
 799         struct ipoib_mcast *mcast, *tmcast;
 800         unsigned long flags;
 801
 802         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 803
 804         spin_lock_irqsave(&priv->lock, flags);
 805
 806         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 807                 list_del(&mcast->list);
 808                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 809                 list_add_tail(&mcast->list, &remove_list);
 810         }
 811
 812         if (priv->broadcast) {
 813                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 814                 list_add_tail(&priv->broadcast->list, &remove_list);
 815                 priv->broadcast = NULL;
 816         }
 817
 818         spin_unlock_irqrestore(&priv->lock, flags);
 819
 820         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 821                 ipoib_mcast_leave(dev, mcast);
 822                 ipoib_mcast_free(mcast);
 823         }
 824 }
 825
 826 void ipoib_mcast_restart_task(struct work_struct *work)
 827 {
 828         struct ipoib_dev_priv *priv =
 829                 container_of(work, struct ipoib_dev_priv, restart_task);
 830         struct net_device *dev = priv->dev;
 831         struct dev_mc_list *mclist;
 832         struct ipoib_mcast *mcast, *tmcast;
 833         LIST_HEAD(remove_list);
 834         unsigned long flags;
 835
 836         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 837
 838         ipoib_mcast_stop_thread(dev, 0);
 839
 840         local_irq_save(flags);
 841         netif_tx_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         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 856                 union ib_gid mgid;
 857
 858                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 859
 860                 /* Add in the P_Key */
 861                 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
 862                 mgid.raw[5] = priv->pkey & 0xff;
 863
 864                 mcast = __ipoib_mcast_find(dev, &mgid);
 865                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 866                         struct ipoib_mcast *nmcast;
 867
 868                         /* Not found or send-only group, let's add a new entry */
 869                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 870                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 871
 872                         nmcast = ipoib_mcast_alloc(dev, 0);
 873                         if (!nmcast) {
 874                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 875                                 continue;
 876                         }
 877
 878                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 879
 880                         nmcast->mcmember.mgid = mgid;
 881
 882                         if (mcast) {
 883                                 /* Destroy the send only entry */
 884                                 list_move_tail(&mcast->list, &remove_list);
 885
 886                                 rb_replace_node(&mcast->rb_node,
 887                                                 &nmcast->rb_node,
 888                                                 &priv->multicast_tree);
 889                         } else
 890                                 __ipoib_mcast_add(dev, nmcast);
 891
 892                         list_add_tail(&nmcast->list, &priv->multicast_list);
 893                 }
 894
 895                 if (mcast)
 896                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 897         }
 898
 899         /* Remove all of the entries don't exist anymore */
 900         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 901                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 902                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 903                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 904                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 905
 906                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 907
 908                         /* Move to the remove list */
 909                         list_move_tail(&mcast->list, &remove_list);
 910                 }
 911         }
 912
 913         spin_unlock(&priv->lock);
 914         netif_tx_unlock(dev);
 915         local_irq_restore(flags);
 916
 917         /* We have to cancel outside of the spinlock */
 918         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 919                 wait_for_mcast_join(priv, mcast);
 920                 ipoib_mcast_leave(mcast->dev, mcast);
 921                 ipoib_mcast_free(mcast);
 922         }
 923
 924         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 925                 ipoib_mcast_start_thread(dev);
 926 }
 927
 928 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 929
 930 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 931 {
 932         struct ipoib_mcast_iter *iter;
 933
 934         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 935         if (!iter)
 936                 return NULL;
 937
 938         iter->dev = dev;
 939         memset(iter->mgid.raw, 0, 16);
 940
 941         if (ipoib_mcast_iter_next(iter)) {
 942                 kfree(iter);
 943                 return NULL;
 944         }
 945
 946         return iter;
 947 }
 948
 949 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 950 {
 951         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 952         struct rb_node *n;
 953         struct ipoib_mcast *mcast;
 954         int ret = 1;
 955
 956         spin_lock_irq(&priv->lock);
 957
 958         n = rb_first(&priv->multicast_tree);
 959
 960         while (n) {
 961                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 962
 963                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 964                            sizeof (union ib_gid)) < 0) {
 965                         iter->mgid      = mcast->mcmember.mgid;
 966                         iter->created   = mcast->created;
 967                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 968                         iter->complete  = !!mcast->ah;
 969                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 970
 971                         ret = 0;
 972
 973                         break;
 974                 }
 975
 976                 n = rb_next(n);
 977         }
 978
 979         spin_unlock_irq(&priv->lock);
 980
 981         return ret;
 982 }
 983
 984 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 985                            union ib_gid *mgid,
 986                            unsigned long *created,
 987                            unsigned int *queuelen,
 988                            unsigned int *complete,
 989                            unsigned int *send_only)
 990 {
 991         *mgid      = iter->mgid;
 992         *created   = iter->created;
 993         *queuelen  = iter->queuelen;
 994         *complete  = iter->complete;
 995         *send_only = iter->send_only;
 996 }
 997
 998 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */