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                 *to_ipoib_neigh(neigh->neighbour) = NULL;
 118                 kfree(neigh);
 119         }
 120
 121         spin_unlock_irqrestore(&priv->lock, flags);
 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         spin_lock_irqsave(&priv->tx_lock, flags);
 132         priv->stats.tx_dropped += tx_dropped;
 133         spin_unlock_irqrestore(&priv->tx_lock, flags);
 134
 135         kfree(mcast);
 136 }
 137
 138 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 139                                              int can_sleep)
 140 {
 141         struct ipoib_mcast *mcast;
 142
 143         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 144         if (!mcast)
 145                 return NULL;
 146
 147         mcast->dev = dev;
 148         mcast->created = 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, union ib_gid *mgid)
 159 {
 160         struct ipoib_dev_priv *priv = netdev_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->raw, 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 = netdev_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 = netdev_priv(dev);
 215         struct ipoib_ah *ah;
 216         int ret;
 217
 218         mcast->mcmember = *mcmember;
 219
 220         /* Set the cached Q_Key before we attach if it's the broadcast group */
 221         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 222                     sizeof (union ib_gid))) {
 223                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 224                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 225         }
 226
 227         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 228                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 229                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 230                                    " already attached\n",
 231                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 232
 233                         return 0;
 234                 }
 235
 236                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 237                                          &mcast->mcmember.mgid);
 238                 if (ret < 0) {
 239                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 240                                    IPOIB_GID_FMT "\n",
 241                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 242
 243                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 244                         return ret;
 245                 }
 246         }
 247
 248         {
 249                 struct ib_ah_attr av = {
 250                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 251                         .port_num      = priv->port,
 252                         .sl            = mcast->mcmember.sl,
 253                         .ah_flags      = IB_AH_GRH,
 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                 int path_rate = ib_sa_rate_enum_to_int(mcast->mcmember.rate);
 262
 263                 av.grh.dgid = mcast->mcmember.mgid;
 264
 265                 if (path_rate > 0 && priv->local_rate > path_rate)
 266                         av.static_rate = (priv->local_rate - 1) / path_rate;
 267
 268                 ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n",
 269                                 av.static_rate, priv->local_rate,
 270                                 ib_sa_rate_enum_to_int(mcast->mcmember.rate));
 271
 272                 ah = ipoib_create_ah(dev, priv->pd, &av);
 273                 if (!ah) {
 274                         ipoib_warn(priv, "ib_address_create failed\n");
 275                 } else {
 276                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 277                                         " AV %p, LID 0x%04x, SL %d\n",
 278                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 279                                         mcast->ah->ah,
 280                                         be16_to_cpu(mcast->mcmember.mlid),
 281                                         mcast->mcmember.sl);
 282                 }
 283
 284                 spin_lock_irq(&priv->lock);
 285                 mcast->ah = ah;
 286                 spin_unlock_irq(&priv->lock);
 287         }
 288
 289         /* actually send any queued packets */
 290         spin_lock_irq(&priv->tx_lock);
 291         while (!skb_queue_empty(&mcast->pkt_queue)) {
 292                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 293                 spin_unlock_irq(&priv->tx_lock);
 294
 295                 skb->dev = dev;
 296
 297                 if (!skb->dst || !skb->dst->neighbour) {
 298                         /* put pseudoheader back on for next time */
 299                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 300                 }
 301
 302                 if (dev_queue_xmit(skb))
 303                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 304                 spin_lock_irq(&priv->tx_lock);
 305         }
 306         spin_unlock_irq(&priv->tx_lock);
 307
 308         return 0;
 309 }
 310
 311 static void
 312 ipoib_mcast_sendonly_join_complete(int status,
 313                                    struct ib_sa_mcmember_rec *mcmember,
 314                                    void *mcast_ptr)
 315 {
 316         struct ipoib_mcast *mcast = mcast_ptr;
 317         struct net_device *dev = mcast->dev;
 318         struct ipoib_dev_priv *priv = netdev_priv(dev);
 319
 320         if (!status)
 321                 ipoib_mcast_join_finish(mcast, mcmember);
 322         else {
 323                 if (mcast->logcount++ < 20)
 324                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 325                                         IPOIB_GID_FMT ", status %d\n",
 326                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 327
 328                 /* Flush out any queued packets */
 329                 spin_lock_irq(&priv->tx_lock);
 330                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 331                         ++priv->stats.tx_dropped;
 332                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 333                 }
 334                 spin_unlock_irq(&priv->tx_lock);
 335
 336                 /* Clear the busy flag so we try again */
 337                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 338         }
 339
 340         complete(&mcast->done);
 341 }
 342
 343 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 344 {
 345         struct net_device *dev = mcast->dev;
 346         struct ipoib_dev_priv *priv = netdev_priv(dev);
 347         struct ib_sa_mcmember_rec rec = {
 348 #if 0                           /* Some SMs don't support send-only yet */
 349                 .join_state = 4
 350 #else
 351                 .join_state = 1
 352 #endif
 353         };
 354         int ret = 0;
 355
 356         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 357                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 358                 return -ENODEV;
 359         }
 360
 361         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 362                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 363                 return -EBUSY;
 364         }
 365
 366         rec.mgid     = mcast->mcmember.mgid;
 367         rec.port_gid = priv->local_gid;
 368         rec.pkey     = cpu_to_be16(priv->pkey);
 369
 370         init_completion(&mcast->done);
 371
 372         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec,
 373                                      IB_SA_MCMEMBER_REC_MGID            |
 374                                      IB_SA_MCMEMBER_REC_PORT_GID        |
 375                                      IB_SA_MCMEMBER_REC_PKEY            |
 376                                      IB_SA_MCMEMBER_REC_JOIN_STATE,
 377                                      1000, GFP_ATOMIC,
 378                                      ipoib_mcast_sendonly_join_complete,
 379                                      mcast, &mcast->query);
 380         if (ret < 0) {
 381                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed (ret = %d)\n",
 382                            ret);
 383         } else {
 384                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 385                                 ", starting join\n",
 386                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 387
 388                 mcast->query_id = ret;
 389         }
 390
 391         return ret;
 392 }
 393
 394 static void ipoib_mcast_join_complete(int status,
 395                                       struct ib_sa_mcmember_rec *mcmember,
 396                                       void *mcast_ptr)
 397 {
 398         struct ipoib_mcast *mcast = mcast_ptr;
 399         struct net_device *dev = mcast->dev;
 400         struct ipoib_dev_priv *priv = netdev_priv(dev);
 401
 402         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 403                         " (status %d)\n",
 404                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 405
 406         if (!status && !ipoib_mcast_join_finish(mcast, mcmember)) {
 407                 mcast->backoff = 1;
 408                 mutex_lock(&mcast_mutex);
 409                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 410                         queue_work(ipoib_workqueue, &priv->mcast_task);
 411                 mutex_unlock(&mcast_mutex);
 412                 complete(&mcast->done);
 413                 return;
 414         }
 415
 416         if (status == -EINTR) {
 417                 complete(&mcast->done);
 418                 return;
 419         }
 420
 421         if (status && mcast->logcount++ < 20) {
 422                 if (status == -ETIMEDOUT || status == -EINTR) {
 423                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 424                                         ", status %d\n",
 425                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 426                                         status);
 427                 } else {
 428                         ipoib_warn(priv, "multicast join failed for "
 429                                    IPOIB_GID_FMT ", status %d\n",
 430                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 431                                    status);
 432                 }
 433         }
 434
 435         mcast->backoff *= 2;
 436         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 437                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 438
 439         mutex_lock(&mcast_mutex);
 440
 441         spin_lock_irq(&priv->lock);
 442         mcast->query = NULL;
 443
 444         if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
 445                 if (status == -ETIMEDOUT)
 446                         queue_work(ipoib_workqueue, &priv->mcast_task);
 447                 else
 448                         queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 449                                            mcast->backoff * HZ);
 450         } else
 451                 complete(&mcast->done);
 452         spin_unlock_irq(&priv->lock);
 453         mutex_unlock(&mcast_mutex);
 454
 455         return;
 456 }
 457
 458 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 459                              int create)
 460 {
 461         struct ipoib_dev_priv *priv = netdev_priv(dev);
 462         struct ib_sa_mcmember_rec rec = {
 463                 .join_state = 1
 464         };
 465         ib_sa_comp_mask comp_mask;
 466         int ret = 0;
 467
 468         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 469                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 470
 471         rec.mgid     = mcast->mcmember.mgid;
 472         rec.port_gid = priv->local_gid;
 473         rec.pkey     = cpu_to_be16(priv->pkey);
 474
 475         comp_mask =
 476                 IB_SA_MCMEMBER_REC_MGID         |
 477                 IB_SA_MCMEMBER_REC_PORT_GID     |
 478                 IB_SA_MCMEMBER_REC_PKEY         |
 479                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 480
 481         if (create) {
 482                 comp_mask |=
 483                         IB_SA_MCMEMBER_REC_QKEY         |
 484                         IB_SA_MCMEMBER_REC_SL           |
 485                         IB_SA_MCMEMBER_REC_FLOW_LABEL   |
 486                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
 487
 488                 rec.qkey          = priv->broadcast->mcmember.qkey;
 489                 rec.sl            = priv->broadcast->mcmember.sl;
 490                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 491                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 492         }
 493
 494         init_completion(&mcast->done);
 495
 496         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec, comp_mask,
 497                                      mcast->backoff * 1000, GFP_ATOMIC,
 498                                      ipoib_mcast_join_complete,
 499                                      mcast, &mcast->query);
 500
 501         if (ret < 0) {
 502                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
 503
 504                 mcast->backoff *= 2;
 505                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 506                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 507
 508                 mutex_lock(&mcast_mutex);
 509                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 510                         queue_delayed_work(ipoib_workqueue,
 511                                            &priv->mcast_task,
 512                                            mcast->backoff * HZ);
 513                 mutex_unlock(&mcast_mutex);
 514         } else
 515                 mcast->query_id = ret;
 516 }
 517
 518 void ipoib_mcast_join_task(void *dev_ptr)
 519 {
 520         struct net_device *dev = dev_ptr;
 521         struct ipoib_dev_priv *priv = netdev_priv(dev);
 522
 523         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 524                 return;
 525
 526         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 527                 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
 528         else
 529                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 530
 531         {
 532                 struct ib_port_attr attr;
 533
 534                 if (!ib_query_port(priv->ca, priv->port, &attr)) {
 535                         priv->local_lid  = attr.lid;
 536                         priv->local_rate = attr.active_speed *
 537                                 ib_width_enum_to_int(attr.active_width);
 538                 } else
 539                         ipoib_warn(priv, "ib_query_port failed\n");
 540         }
 541
 542         if (!priv->broadcast) {
 543                 struct ipoib_mcast *broadcast;
 544
 545                 broadcast = ipoib_mcast_alloc(dev, 1);
 546                 if (!broadcast) {
 547                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 548                         mutex_lock(&mcast_mutex);
 549                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 550                                 queue_delayed_work(ipoib_workqueue,
 551                                                    &priv->mcast_task, HZ);
 552                         mutex_unlock(&mcast_mutex);
 553                         return;
 554                 }
 555
 556                 spin_lock_irq(&priv->lock);
 557                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 558                        sizeof (union ib_gid));
 559                 priv->broadcast = broadcast;
 560
 561                 __ipoib_mcast_add(dev, priv->broadcast);
 562                 spin_unlock_irq(&priv->lock);
 563         }
 564
 565         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 566                 ipoib_mcast_join(dev, priv->broadcast, 0);
 567                 return;
 568         }
 569
 570         while (1) {
 571                 struct ipoib_mcast *mcast = NULL;
 572
 573                 spin_lock_irq(&priv->lock);
 574                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 575                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 576                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 577                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 578                                 /* Found the next unjoined group */
 579                                 break;
 580                         }
 581                 }
 582                 spin_unlock_irq(&priv->lock);
 583
 584                 if (&mcast->list == &priv->multicast_list) {
 585                         /* All done */
 586                         break;
 587                 }
 588
 589                 ipoib_mcast_join(dev, mcast, 1);
 590                 return;
 591         }
 592
 593         priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
 594                 IPOIB_ENCAP_LEN;
 595         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 596
 597         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 598
 599         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 600         netif_carrier_on(dev);
 601 }
 602
 603 int ipoib_mcast_start_thread(struct net_device *dev)
 604 {
 605         struct ipoib_dev_priv *priv = netdev_priv(dev);
 606
 607         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 608
 609         mutex_lock(&mcast_mutex);
 610         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 611                 queue_work(ipoib_workqueue, &priv->mcast_task);
 612         mutex_unlock(&mcast_mutex);
 613
 614         spin_lock_irq(&priv->lock);
 615         set_bit(IPOIB_MCAST_STARTED, &priv->flags);
 616         spin_unlock_irq(&priv->lock);
 617
 618         return 0;
 619 }
 620
 621 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 622 {
 623         struct ipoib_dev_priv *priv = netdev_priv(dev);
 624         struct ipoib_mcast *mcast;
 625
 626         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 627
 628         spin_lock_irq(&priv->lock);
 629         clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
 630         spin_unlock_irq(&priv->lock);
 631
 632         mutex_lock(&mcast_mutex);
 633         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 634         cancel_delayed_work(&priv->mcast_task);
 635         mutex_unlock(&mcast_mutex);
 636
 637         if (flush)
 638                 flush_workqueue(ipoib_workqueue);
 639
 640         spin_lock_irq(&priv->lock);
 641         if (priv->broadcast && priv->broadcast->query) {
 642                 ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
 643                 priv->broadcast->query = NULL;
 644                 spin_unlock_irq(&priv->lock);
 645                 ipoib_dbg_mcast(priv, "waiting for bcast\n");
 646                 wait_for_completion(&priv->broadcast->done);
 647         } else
 648                 spin_unlock_irq(&priv->lock);
 649
 650         list_for_each_entry(mcast, &priv->multicast_list, list) {
 651                 spin_lock_irq(&priv->lock);
 652                 if (mcast->query) {
 653                         ib_sa_cancel_query(mcast->query_id, mcast->query);
 654                         mcast->query = NULL;
 655                         spin_unlock_irq(&priv->lock);
 656                         ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
 657                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 658                         wait_for_completion(&mcast->done);
 659                 } else
 660                         spin_unlock_irq(&priv->lock);
 661         }
 662
 663         return 0;
 664 }
 665
 666 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 667 {
 668         struct ipoib_dev_priv *priv = netdev_priv(dev);
 669         struct ib_sa_mcmember_rec rec = {
 670                 .join_state = 1
 671         };
 672         int ret = 0;
 673
 674         if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
 675                 return 0;
 676
 677         ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 678                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 679
 680         rec.mgid     = mcast->mcmember.mgid;
 681         rec.port_gid = priv->local_gid;
 682         rec.pkey     = cpu_to_be16(priv->pkey);
 683
 684         /* Remove ourselves from the multicast group */
 685         ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
 686                                  &mcast->mcmember.mgid);
 687         if (ret)
 688                 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
 689
 690         /*
 691          * Just make one shot at leaving and don't wait for a reply;
 692          * if we fail, too bad.
 693          */
 694         ret = ib_sa_mcmember_rec_delete(priv->ca, priv->port, &rec,
 695                                         IB_SA_MCMEMBER_REC_MGID         |
 696                                         IB_SA_MCMEMBER_REC_PORT_GID     |
 697                                         IB_SA_MCMEMBER_REC_PKEY         |
 698                                         IB_SA_MCMEMBER_REC_JOIN_STATE,
 699                                         0, GFP_ATOMIC, NULL,
 700                                         mcast, &mcast->query);
 701         if (ret < 0)
 702                 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
 703                            "for leave (result = %d)\n", ret);
 704
 705         return 0;
 706 }
 707
 708 void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
 709                       struct sk_buff *skb)
 710 {
 711         struct ipoib_dev_priv *priv = netdev_priv(dev);
 712         struct ipoib_mcast *mcast;
 713
 714         /*
 715          * We can only be called from ipoib_start_xmit, so we're
 716          * inside tx_lock -- no need to save/restore flags.
 717          */
 718         spin_lock(&priv->lock);
 719
 720         if (!test_bit(IPOIB_MCAST_STARTED, &priv->flags)        ||
 721             !priv->broadcast                                    ||
 722             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 723                 ++priv->stats.tx_dropped;
 724                 dev_kfree_skb_any(skb);
 725                 goto unlock;
 726         }
 727
 728         mcast = __ipoib_mcast_find(dev, mgid);
 729         if (!mcast) {
 730                 /* Let's create a new send only group now */
 731                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 732                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(*mgid));
 733
 734                 mcast = ipoib_mcast_alloc(dev, 0);
 735                 if (!mcast) {
 736                         ipoib_warn(priv, "unable to allocate memory for "
 737                                    "multicast structure\n");
 738                         ++priv->stats.tx_dropped;
 739                         dev_kfree_skb_any(skb);
 740                         goto out;
 741                 }
 742
 743                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 744                 mcast->mcmember.mgid = *mgid;
 745                 __ipoib_mcast_add(dev, mcast);
 746                 list_add_tail(&mcast->list, &priv->multicast_list);
 747         }
 748
 749         if (!mcast->ah) {
 750                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 751                         skb_queue_tail(&mcast->pkt_queue, skb);
 752                 else {
 753                         ++priv->stats.tx_dropped;
 754                         dev_kfree_skb_any(skb);
 755                 }
 756
 757                 if (mcast->query)
 758                         ipoib_dbg_mcast(priv, "no address vector, "
 759                                         "but multicast join already started\n");
 760                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 761                         ipoib_mcast_sendonly_join(mcast);
 762
 763                 /*
 764                  * If lookup completes between here and out:, don't
 765                  * want to send packet twice.
 766                  */
 767                 mcast = NULL;
 768         }
 769
 770 out:
 771         if (mcast && mcast->ah) {
 772                 if (skb->dst            &&
 773                     skb->dst->neighbour &&
 774                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 775                         struct ipoib_neigh *neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 776
 777                         if (neigh) {
 778                                 kref_get(&mcast->ah->ref);
 779                                 neigh->ah       = mcast->ah;
 780                                 neigh->neighbour = skb->dst->neighbour;
 781                                 *to_ipoib_neigh(skb->dst->neighbour) = neigh;
 782                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 783                         }
 784                 }
 785
 786                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 787         }
 788
 789 unlock:
 790         spin_unlock(&priv->lock);
 791 }
 792
 793 void ipoib_mcast_dev_flush(struct net_device *dev)
 794 {
 795         struct ipoib_dev_priv *priv = netdev_priv(dev);
 796         LIST_HEAD(remove_list);
 797         struct ipoib_mcast *mcast, *tmcast;
 798         unsigned long flags;
 799
 800         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 801
 802         spin_lock_irqsave(&priv->lock, flags);
 803
 804         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 805                 list_del(&mcast->list);
 806                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 807                 list_add_tail(&mcast->list, &remove_list);
 808         }
 809
 810         if (priv->broadcast) {
 811                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 812                 list_add_tail(&priv->broadcast->list, &remove_list);
 813                 priv->broadcast = NULL;
 814         }
 815
 816         spin_unlock_irqrestore(&priv->lock, flags);
 817
 818         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 819                 ipoib_mcast_leave(dev, mcast);
 820                 ipoib_mcast_free(mcast);
 821         }
 822 }
 823
 824 void ipoib_mcast_restart_task(void *dev_ptr)
 825 {
 826         struct net_device *dev = dev_ptr;
 827         struct ipoib_dev_priv *priv = netdev_priv(dev);
 828         struct dev_mc_list *mclist;
 829         struct ipoib_mcast *mcast, *tmcast;
 830         LIST_HEAD(remove_list);
 831         unsigned long flags;
 832
 833         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 834
 835         ipoib_mcast_stop_thread(dev, 0);
 836
 837         spin_lock_irqsave(&dev->xmit_lock, flags);
 838         spin_lock(&priv->lock);
 839
 840         /*
 841          * Unfortunately, the networking core only gives us a list of all of
 842          * the multicast hardware addresses. We need to figure out which ones
 843          * are new and which ones have been removed
 844          */
 845
 846         /* Clear out the found flag */
 847         list_for_each_entry(mcast, &priv->multicast_list, list)
 848                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 849
 850         /* Mark all of the entries that are found or don't exist */
 851         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 852                 union ib_gid mgid;
 853
 854                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 855
 856                 /* Add in the P_Key */
 857                 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
 858                 mgid.raw[5] = priv->pkey & 0xff;
 859
 860                 mcast = __ipoib_mcast_find(dev, &mgid);
 861                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 862                         struct ipoib_mcast *nmcast;
 863
 864                         /* Not found or send-only group, let's add a new entry */
 865                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 866                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 867
 868                         nmcast = ipoib_mcast_alloc(dev, 0);
 869                         if (!nmcast) {
 870                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 871                                 continue;
 872                         }
 873
 874                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 875
 876                         nmcast->mcmember.mgid = mgid;
 877
 878                         if (mcast) {
 879                                 /* Destroy the send only entry */
 880                                 list_del(&mcast->list);
 881                                 list_add_tail(&mcast->list, &remove_list);
 882
 883                                 rb_replace_node(&mcast->rb_node,
 884                                                 &nmcast->rb_node,
 885                                                 &priv->multicast_tree);
 886                         } else
 887                                 __ipoib_mcast_add(dev, nmcast);
 888
 889                         list_add_tail(&nmcast->list, &priv->multicast_list);
 890                 }
 891
 892                 if (mcast)
 893                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 894         }
 895
 896         /* Remove all of the entries don't exist anymore */
 897         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 898                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 899                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 900                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 901                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 902
 903                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 904
 905                         /* Move to the remove list */
 906                         list_del(&mcast->list);
 907                         list_add_tail(&mcast->list, &remove_list);
 908                 }
 909         }
 910
 911         spin_unlock(&priv->lock);
 912         spin_unlock_irqrestore(&dev->xmit_lock, flags);
 913
 914         /* We have to cancel outside of the spinlock */
 915         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 916                 ipoib_mcast_leave(mcast->dev, mcast);
 917                 ipoib_mcast_free(mcast);
 918         }
 919
 920         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 921                 ipoib_mcast_start_thread(dev);
 922 }
 923
 924 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 925
 926 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 927 {
 928         struct ipoib_mcast_iter *iter;
 929
 930         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 931         if (!iter)
 932                 return NULL;
 933
 934         iter->dev = dev;
 935         memset(iter->mgid.raw, 0, 16);
 936
 937         if (ipoib_mcast_iter_next(iter)) {
 938                 kfree(iter);
 939                 return NULL;
 940         }
 941
 942         return iter;
 943 }
 944
 945 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 946 {
 947         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 948         struct rb_node *n;
 949         struct ipoib_mcast *mcast;
 950         int ret = 1;
 951
 952         spin_lock_irq(&priv->lock);
 953
 954         n = rb_first(&priv->multicast_tree);
 955
 956         while (n) {
 957                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 958
 959                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 960                            sizeof (union ib_gid)) < 0) {
 961                         iter->mgid      = mcast->mcmember.mgid;
 962                         iter->created   = mcast->created;
 963                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 964                         iter->complete  = !!mcast->ah;
 965                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 966
 967                         ret = 0;
 968
 969                         break;
 970                 }
 971
 972                 n = rb_next(n);
 973         }
 974
 975         spin_unlock_irq(&priv->lock);
 976
 977         return ret;
 978 }
 979
 980 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 981                            union ib_gid *mgid,
 982                            unsigned long *created,
 983                            unsigned int *queuelen,
 984                            unsigned int *complete,
 985                            unsigned int *send_only)
 986 {
 987         *mgid      = iter->mgid;
 988         *created   = iter->created;
 989         *queuelen  = iter->queuelen;
 990         *complete  = iter->complete;
 991         *send_only = iter->send_only;
 992 }
 993
 994 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */