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