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                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 198                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 199         }
 200
 201         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 202                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 203                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 204                                    " already attached\n",
 205                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 206
 207                         return 0;
 208                 }
 209
 210                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 211                                          &mcast->mcmember.mgid);
 212                 if (ret < 0) {
 213                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 214                                    IPOIB_GID_FMT "\n",
 215                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 216
 217                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 218                         return ret;
 219                 }
 220         }
 221
 222         {
 223                 struct ib_ah_attr av = {
 224                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 225                         .port_num      = priv->port,
 226                         .sl            = mcast->mcmember.sl,
 227                         .ah_flags      = IB_AH_GRH,
 228                         .static_rate   = mcast->mcmember.rate,
 229                         .grh           = {
 230                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 231                                 .hop_limit     = mcast->mcmember.hop_limit,
 232                                 .sgid_index    = 0,
 233                                 .traffic_class = mcast->mcmember.traffic_class
 234                         }
 235                 };
 236                 av.grh.dgid = mcast->mcmember.mgid;
 237
 238                 ah = ipoib_create_ah(dev, priv->pd, &av);
 239                 if (!ah) {
 240                         ipoib_warn(priv, "ib_address_create failed\n");
 241                 } else {
 242                         spin_lock_irq(&priv->lock);
 243                         mcast->ah = ah;
 244                         spin_unlock_irq(&priv->lock);
 245
 246                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 247                                         " AV %p, LID 0x%04x, SL %d\n",
 248                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 249                                         mcast->ah->ah,
 250                                         be16_to_cpu(mcast->mcmember.mlid),
 251                                         mcast->mcmember.sl);
 252                 }
 253         }
 254
 255         /* actually send any queued packets */
 256         spin_lock_irq(&priv->tx_lock);
 257         while (!skb_queue_empty(&mcast->pkt_queue)) {
 258                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 259                 spin_unlock_irq(&priv->tx_lock);
 260
 261                 skb->dev = dev;
 262
 263                 if (!skb->dst || !skb->dst->neighbour) {
 264                         /* put pseudoheader back on for next time */
 265                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 266                 }
 267
 268                 if (dev_queue_xmit(skb))
 269                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 270                 spin_lock_irq(&priv->tx_lock);
 271         }
 272         spin_unlock_irq(&priv->tx_lock);
 273
 274         return 0;
 275 }
 276
 277 static int
 278 ipoib_mcast_sendonly_join_complete(int status,
 279                                    struct ib_sa_multicast *multicast)
 280 {
 281         struct ipoib_mcast *mcast = multicast->context;
 282         struct net_device *dev = mcast->dev;
 283         struct ipoib_dev_priv *priv = netdev_priv(dev);
 284
 285         /* We trap for port events ourselves. */
 286         if (status == -ENETRESET)
 287                 return 0;
 288
 289         if (!status)
 290                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 291
 292         if (status) {
 293                 if (mcast->logcount++ < 20)
 294                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 295                                         IPOIB_GID_FMT ", status %d\n",
 296                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 297
 298                 /* Flush out any queued packets */
 299                 spin_lock_irq(&priv->tx_lock);
 300                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 301                         ++dev->stats.tx_dropped;
 302                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 303                 }
 304                 spin_unlock_irq(&priv->tx_lock);
 305
 306                 /* Clear the busy flag so we try again */
 307                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
 308                                             &mcast->flags);
 309         }
 310         return status;
 311 }
 312
 313 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 314 {
 315         struct net_device *dev = mcast->dev;
 316         struct ipoib_dev_priv *priv = netdev_priv(dev);
 317         struct ib_sa_mcmember_rec rec = {
 318 #if 0                           /* Some SMs don't support send-only yet */
 319                 .join_state = 4
 320 #else
 321                 .join_state = 1
 322 #endif
 323         };
 324         int ret = 0;
 325
 326         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 327                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 328                 return -ENODEV;
 329         }
 330
 331         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 332                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 333                 return -EBUSY;
 334         }
 335
 336         rec.mgid     = mcast->mcmember.mgid;
 337         rec.port_gid = priv->local_gid;
 338         rec.pkey     = cpu_to_be16(priv->pkey);
 339
 340         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 341                                          priv->port, &rec,
 342                                          IB_SA_MCMEMBER_REC_MGID        |
 343                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 344                                          IB_SA_MCMEMBER_REC_PKEY        |
 345                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 346                                          GFP_ATOMIC,
 347                                          ipoib_mcast_sendonly_join_complete,
 348                                          mcast);
 349         if (IS_ERR(mcast->mc)) {
 350                 ret = PTR_ERR(mcast->mc);
 351                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 352                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
 353                            ret);
 354         } else {
 355                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 356                                 ", starting join\n",
 357                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 358         }
 359
 360         return ret;
 361 }
 362
 363 static int ipoib_mcast_join_complete(int status,
 364                                      struct ib_sa_multicast *multicast)
 365 {
 366         struct ipoib_mcast *mcast = multicast->context;
 367         struct net_device *dev = mcast->dev;
 368         struct ipoib_dev_priv *priv = netdev_priv(dev);
 369
 370         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 371                         " (status %d)\n",
 372                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 373
 374         /* We trap for port events ourselves. */
 375         if (status == -ENETRESET)
 376                 return 0;
 377
 378         if (!status)
 379                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 380
 381         if (!status) {
 382                 mcast->backoff = 1;
 383                 mutex_lock(&mcast_mutex);
 384                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 385                         queue_delayed_work(ipoib_workqueue,
 386                                            &priv->mcast_task, 0);
 387                 mutex_unlock(&mcast_mutex);
 388
 389                 if (mcast == priv->broadcast)
 390                         netif_carrier_on(dev);
 391
 392                 return 0;
 393         }
 394
 395         if (mcast->logcount++ < 20) {
 396                 if (status == -ETIMEDOUT) {
 397                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 398                                         ", status %d\n",
 399                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 400                                         status);
 401                 } else {
 402                         ipoib_warn(priv, "multicast join failed for "
 403                                    IPOIB_GID_FMT ", status %d\n",
 404                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 405                                    status);
 406                 }
 407         }
 408
 409         mcast->backoff *= 2;
 410         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 411                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 412
 413         /* Clear the busy flag so we try again */
 414         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 415
 416         mutex_lock(&mcast_mutex);
 417         spin_lock_irq(&priv->lock);
 418         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 419                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 420                                    mcast->backoff * HZ);
 421         spin_unlock_irq(&priv->lock);
 422         mutex_unlock(&mcast_mutex);
 423
 424         return status;
 425 }
 426
 427 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 428                              int create)
 429 {
 430         struct ipoib_dev_priv *priv = netdev_priv(dev);
 431         struct ib_sa_mcmember_rec rec = {
 432                 .join_state = 1
 433         };
 434         ib_sa_comp_mask comp_mask;
 435         int ret = 0;
 436
 437         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 438                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 439
 440         rec.mgid     = mcast->mcmember.mgid;
 441         rec.port_gid = priv->local_gid;
 442         rec.pkey     = cpu_to_be16(priv->pkey);
 443
 444         comp_mask =
 445                 IB_SA_MCMEMBER_REC_MGID         |
 446                 IB_SA_MCMEMBER_REC_PORT_GID     |
 447                 IB_SA_MCMEMBER_REC_PKEY         |
 448                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 449
 450         if (create) {
 451                 comp_mask |=
 452                         IB_SA_MCMEMBER_REC_QKEY                 |
 453                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 454                         IB_SA_MCMEMBER_REC_MTU                  |
 455                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 456                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 457                         IB_SA_MCMEMBER_REC_RATE                 |
 458                         IB_SA_MCMEMBER_REC_SL                   |
 459                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 460                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 461
 462                 rec.qkey          = priv->broadcast->mcmember.qkey;
 463                 rec.mtu_selector  = IB_SA_EQ;
 464                 rec.mtu           = priv->broadcast->mcmember.mtu;
 465                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 466                 rec.rate_selector = IB_SA_EQ;
 467                 rec.rate          = priv->broadcast->mcmember.rate;
 468                 rec.sl            = priv->broadcast->mcmember.sl;
 469                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 470                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 471         }
 472
 473         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 474         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 475                                          &rec, comp_mask, GFP_KERNEL,
 476                                          ipoib_mcast_join_complete, mcast);
 477         if (IS_ERR(mcast->mc)) {
 478                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 479                 ret = PTR_ERR(mcast->mc);
 480                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 481
 482                 mcast->backoff *= 2;
 483                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 484                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 485
 486                 mutex_lock(&mcast_mutex);
 487                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 488                         queue_delayed_work(ipoib_workqueue,
 489                                            &priv->mcast_task,
 490                                            mcast->backoff * HZ);
 491                 mutex_unlock(&mcast_mutex);
 492         }
 493 }
 494
 495 void ipoib_mcast_join_task(struct work_struct *work)
 496 {
 497         struct ipoib_dev_priv *priv =
 498                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 499         struct net_device *dev = priv->dev;
 500
 501         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 502                 return;
 503
 504         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 505                 ipoib_warn(priv, "ib_query_gid() failed\n");
 506         else
 507                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 508
 509         {
 510                 struct ib_port_attr attr;
 511
 512                 if (!ib_query_port(priv->ca, priv->port, &attr))
 513                         priv->local_lid = attr.lid;
 514                 else
 515                         ipoib_warn(priv, "ib_query_port failed\n");
 516         }
 517
 518         if (!priv->broadcast) {
 519                 struct ipoib_mcast *broadcast;
 520
 521                 broadcast = ipoib_mcast_alloc(dev, 1);
 522                 if (!broadcast) {
 523                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 524                         mutex_lock(&mcast_mutex);
 525                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 526                                 queue_delayed_work(ipoib_workqueue,
 527                                                    &priv->mcast_task, HZ);
 528                         mutex_unlock(&mcast_mutex);
 529                         return;
 530                 }
 531
 532                 spin_lock_irq(&priv->lock);
 533                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 534                        sizeof (union ib_gid));
 535                 priv->broadcast = broadcast;
 536
 537                 __ipoib_mcast_add(dev, priv->broadcast);
 538                 spin_unlock_irq(&priv->lock);
 539         }
 540
 541         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 542                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 543                         ipoib_mcast_join(dev, priv->broadcast, 0);
 544                 return;
 545         }
 546
 547         while (1) {
 548                 struct ipoib_mcast *mcast = NULL;
 549
 550                 spin_lock_irq(&priv->lock);
 551                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 552                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 553                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 554                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 555                                 /* Found the next unjoined group */
 556                                 break;
 557                         }
 558                 }
 559                 spin_unlock_irq(&priv->lock);
 560
 561                 if (&mcast->list == &priv->multicast_list) {
 562                         /* All done */
 563                         break;
 564                 }
 565
 566                 ipoib_mcast_join(dev, mcast, 1);
 567                 return;
 568         }
 569
 570         priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
 571                 IPOIB_ENCAP_LEN;
 572
 573         if (!ipoib_cm_admin_enabled(dev))
 574                 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 575
 576         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 577
 578         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 579 }
 580
 581 int ipoib_mcast_start_thread(struct net_device *dev)
 582 {
 583         struct ipoib_dev_priv *priv = netdev_priv(dev);
 584
 585         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 586
 587         mutex_lock(&mcast_mutex);
 588         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 589                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 590         mutex_unlock(&mcast_mutex);
 591
 592         spin_lock_irq(&priv->lock);
 593         set_bit(IPOIB_MCAST_STARTED, &priv->flags);
 594         spin_unlock_irq(&priv->lock);
 595
 596         return 0;
 597 }
 598
 599 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 600 {
 601         struct ipoib_dev_priv *priv = netdev_priv(dev);
 602
 603         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 604
 605         spin_lock_irq(&priv->lock);
 606         clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
 607         spin_unlock_irq(&priv->lock);
 608
 609         mutex_lock(&mcast_mutex);
 610         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 611         cancel_delayed_work(&priv->mcast_task);
 612         mutex_unlock(&mcast_mutex);
 613
 614         if (flush)
 615                 flush_workqueue(ipoib_workqueue);
 616
 617         return 0;
 618 }
 619
 620 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 621 {
 622         struct ipoib_dev_priv *priv = netdev_priv(dev);
 623         int ret = 0;
 624
 625         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 626                 ib_sa_free_multicast(mcast->mc);
 627
 628         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 629                 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 630                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 631
 632                 /* Remove ourselves from the multicast group */
 633                 ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
 634                                          &mcast->mcmember.mgid);
 635                 if (ret)
 636                         ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
 637         }
 638
 639         return 0;
 640 }
 641
 642 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 643 {
 644         struct ipoib_dev_priv *priv = netdev_priv(dev);
 645         struct ipoib_mcast *mcast;
 646
 647         /*
 648          * We can only be called from ipoib_start_xmit, so we're
 649          * inside tx_lock -- no need to save/restore flags.
 650          */
 651         spin_lock(&priv->lock);
 652
 653         if (!test_bit(IPOIB_MCAST_STARTED, &priv->flags)        ||
 654             !priv->broadcast                                    ||
 655             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 656                 ++dev->stats.tx_dropped;
 657                 dev_kfree_skb_any(skb);
 658                 goto unlock;
 659         }
 660
 661         mcast = __ipoib_mcast_find(dev, mgid);
 662         if (!mcast) {
 663                 /* Let's create a new send only group now */
 664                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 665                                 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
 666
 667                 mcast = ipoib_mcast_alloc(dev, 0);
 668                 if (!mcast) {
 669                         ipoib_warn(priv, "unable to allocate memory for "
 670                                    "multicast structure\n");
 671                         ++dev->stats.tx_dropped;
 672                         dev_kfree_skb_any(skb);
 673                         goto out;
 674                 }
 675
 676                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 677                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 678                 __ipoib_mcast_add(dev, mcast);
 679                 list_add_tail(&mcast->list, &priv->multicast_list);
 680         }
 681
 682         if (!mcast->ah) {
 683                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 684                         skb_queue_tail(&mcast->pkt_queue, skb);
 685                 else {
 686                         ++dev->stats.tx_dropped;
 687                         dev_kfree_skb_any(skb);
 688                 }
 689
 690                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 691                         ipoib_dbg_mcast(priv, "no address vector, "
 692                                         "but multicast join already started\n");
 693                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 694                         ipoib_mcast_sendonly_join(mcast);
 695
 696                 /*
 697                  * If lookup completes between here and out:, don't
 698                  * want to send packet twice.
 699                  */
 700                 mcast = NULL;
 701         }
 702
 703 out:
 704         if (mcast && mcast->ah) {
 705                 if (skb->dst            &&
 706                     skb->dst->neighbour &&
 707                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 708                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour);
 709
 710                         if (neigh) {
 711                                 kref_get(&mcast->ah->ref);
 712                                 neigh->ah       = mcast->ah;
 713                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 714                         }
 715                 }
 716
 717                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 718         }
 719
 720 unlock:
 721         spin_unlock(&priv->lock);
 722 }
 723
 724 void ipoib_mcast_dev_flush(struct net_device *dev)
 725 {
 726         struct ipoib_dev_priv *priv = netdev_priv(dev);
 727         LIST_HEAD(remove_list);
 728         struct ipoib_mcast *mcast, *tmcast;
 729         unsigned long flags;
 730
 731         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 732
 733         spin_lock_irqsave(&priv->lock, flags);
 734
 735         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 736                 list_del(&mcast->list);
 737                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 738                 list_add_tail(&mcast->list, &remove_list);
 739         }
 740
 741         if (priv->broadcast) {
 742                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 743                 list_add_tail(&priv->broadcast->list, &remove_list);
 744                 priv->broadcast = NULL;
 745         }
 746
 747         spin_unlock_irqrestore(&priv->lock, flags);
 748
 749         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 750                 ipoib_mcast_leave(dev, mcast);
 751                 ipoib_mcast_free(mcast);
 752         }
 753 }
 754
 755 void ipoib_mcast_restart_task(struct work_struct *work)
 756 {
 757         struct ipoib_dev_priv *priv =
 758                 container_of(work, struct ipoib_dev_priv, restart_task);
 759         struct net_device *dev = priv->dev;
 760         struct dev_mc_list *mclist;
 761         struct ipoib_mcast *mcast, *tmcast;
 762         LIST_HEAD(remove_list);
 763         unsigned long flags;
 764         struct ib_sa_mcmember_rec rec;
 765
 766         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 767
 768         ipoib_mcast_stop_thread(dev, 0);
 769
 770         local_irq_save(flags);
 771         netif_tx_lock(dev);
 772         spin_lock(&priv->lock);
 773
 774         /*
 775          * Unfortunately, the networking core only gives us a list of all of
 776          * the multicast hardware addresses. We need to figure out which ones
 777          * are new and which ones have been removed
 778          */
 779
 780         /* Clear out the found flag */
 781         list_for_each_entry(mcast, &priv->multicast_list, list)
 782                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 783
 784         /* Mark all of the entries that are found or don't exist */
 785         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 786                 union ib_gid mgid;
 787
 788                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 789
 790                 /* Add in the P_Key */
 791                 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
 792                 mgid.raw[5] = priv->pkey & 0xff;
 793
 794                 mcast = __ipoib_mcast_find(dev, &mgid);
 795                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 796                         struct ipoib_mcast *nmcast;
 797
 798                         /* ignore group which is directly joined by userspace */
 799                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 800                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 801                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid "
 802                                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 803                                 continue;
 804                         }
 805
 806                         /* Not found or send-only group, let's add a new entry */
 807                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 808                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 809
 810                         nmcast = ipoib_mcast_alloc(dev, 0);
 811                         if (!nmcast) {
 812                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 813                                 continue;
 814                         }
 815
 816                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 817
 818                         nmcast->mcmember.mgid = mgid;
 819
 820                         if (mcast) {
 821                                 /* Destroy the send only entry */
 822                                 list_move_tail(&mcast->list, &remove_list);
 823
 824                                 rb_replace_node(&mcast->rb_node,
 825                                                 &nmcast->rb_node,
 826                                                 &priv->multicast_tree);
 827                         } else
 828                                 __ipoib_mcast_add(dev, nmcast);
 829
 830                         list_add_tail(&nmcast->list, &priv->multicast_list);
 831                 }
 832
 833                 if (mcast)
 834                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 835         }
 836
 837         /* Remove all of the entries don't exist anymore */
 838         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 839                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 840                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 841                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 842                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 843
 844                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 845
 846                         /* Move to the remove list */
 847                         list_move_tail(&mcast->list, &remove_list);
 848                 }
 849         }
 850
 851         spin_unlock(&priv->lock);
 852         netif_tx_unlock(dev);
 853         local_irq_restore(flags);
 854
 855         /* We have to cancel outside of the spinlock */
 856         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 857                 ipoib_mcast_leave(mcast->dev, mcast);
 858                 ipoib_mcast_free(mcast);
 859         }
 860
 861         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 862                 ipoib_mcast_start_thread(dev);
 863 }
 864
 865 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 866
 867 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 868 {
 869         struct ipoib_mcast_iter *iter;
 870
 871         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 872         if (!iter)
 873                 return NULL;
 874
 875         iter->dev = dev;
 876         memset(iter->mgid.raw, 0, 16);
 877
 878         if (ipoib_mcast_iter_next(iter)) {
 879                 kfree(iter);
 880                 return NULL;
 881         }
 882
 883         return iter;
 884 }
 885
 886 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 887 {
 888         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 889         struct rb_node *n;
 890         struct ipoib_mcast *mcast;
 891         int ret = 1;
 892
 893         spin_lock_irq(&priv->lock);
 894
 895         n = rb_first(&priv->multicast_tree);
 896
 897         while (n) {
 898                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 899
 900                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 901                            sizeof (union ib_gid)) < 0) {
 902                         iter->mgid      = mcast->mcmember.mgid;
 903                         iter->created   = mcast->created;
 904                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 905                         iter->complete  = !!mcast->ah;
 906                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 907
 908                         ret = 0;
 909
 910                         break;
 911                 }
 912
 913                 n = rb_next(n);
 914         }
 915
 916         spin_unlock_irq(&priv->lock);
 917
 918         return ret;
 919 }
 920
 921 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 922                            union ib_gid *mgid,
 923                            unsigned long *created,
 924                            unsigned int *queuelen,
 925                            unsigned int *complete,
 926                            unsigned int *send_only)
 927 {
 928         *mgid      = iter->mgid;
 929         *created   = iter->created;
 930         *queuelen  = iter->queuelen;
 931         *complete  = iter->complete;
 932         *send_only = iter->send_only;
 933 }
 934
 935 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */