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