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
  35 #include <linux/skbuff.h>
  36 #include <linux/rtnetlink.h>
  37 #include <linux/ip.h>
  38 #include <linux/in.h>
  39 #include <linux/igmp.h>
  40 #include <linux/inetdevice.h>
  41 #include <linux/delay.h>
  42 #include <linux/completion.h>
  43
  44 #include <net/dst.h>
  45
  46 #include "ipoib.h"
  47
  48 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  49 static int mcast_debug_level;
  50
  51 module_param(mcast_debug_level, int, 0644);
  52 MODULE_PARM_DESC(mcast_debug_level,
  53                  "Enable multicast debug tracing if > 0");
  54 #endif
  55
  56 static DEFINE_MUTEX(mcast_mutex);
  57
  58 struct ipoib_mcast_iter {
  59         struct net_device *dev;
  60         union ib_gid       mgid;
  61         unsigned long      created;
  62         unsigned int       queuelen;
  63         unsigned int       complete;
  64         unsigned int       send_only;
  65 };
  66
  67 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  68 {
  69         struct net_device *dev = mcast->dev;
  70         struct ipoib_dev_priv *priv = netdev_priv(dev);
  71         struct ipoib_neigh *neigh, *tmp;
  72         int tx_dropped = 0;
  73
  74         ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
  75                         mcast->mcmember.mgid.raw);
  76
  77         spin_lock_irq(&priv->lock);
  78
  79         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
  80                 /*
  81                  * It's safe to call ipoib_put_ah() inside priv->lock
  82                  * here, because we know that mcast->ah will always
  83                  * hold one more reference, so ipoib_put_ah() will
  84                  * never do more than decrement the ref count.
  85                  */
  86                 if (neigh->ah)
  87                         ipoib_put_ah(neigh->ah);
  88                 ipoib_neigh_free(dev, neigh);
  89         }
  90
  91         spin_unlock_irq(&priv->lock);
  92
  93         if (mcast->ah)
  94                 ipoib_put_ah(mcast->ah);
  95
  96         while (!skb_queue_empty(&mcast->pkt_queue)) {
  97                 ++tx_dropped;
  98                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
  99         }
 100
 101         netif_tx_lock_bh(dev);
 102         dev->stats.tx_dropped += tx_dropped;
 103         netif_tx_unlock_bh(dev);
 104
 105         kfree(mcast);
 106 }
 107
 108 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 109                                              int can_sleep)
 110 {
 111         struct ipoib_mcast *mcast;
 112
 113         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 114         if (!mcast)
 115                 return NULL;
 116
 117         mcast->dev = dev;
 118         mcast->created = jiffies;
 119         mcast->backoff = 1;
 120
 121         INIT_LIST_HEAD(&mcast->list);
 122         INIT_LIST_HEAD(&mcast->neigh_list);
 123         skb_queue_head_init(&mcast->pkt_queue);
 124
 125         return mcast;
 126 }
 127
 128 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 129 {
 130         struct ipoib_dev_priv *priv = netdev_priv(dev);
 131         struct rb_node *n = priv->multicast_tree.rb_node;
 132
 133         while (n) {
 134                 struct ipoib_mcast *mcast;
 135                 int ret;
 136
 137                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 138
 139                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 140                              sizeof (union ib_gid));
 141                 if (ret < 0)
 142                         n = n->rb_left;
 143                 else if (ret > 0)
 144                         n = n->rb_right;
 145                 else
 146                         return mcast;
 147         }
 148
 149         return NULL;
 150 }
 151
 152 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 153 {
 154         struct ipoib_dev_priv *priv = netdev_priv(dev);
 155         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 156
 157         while (*n) {
 158                 struct ipoib_mcast *tmcast;
 159                 int ret;
 160
 161                 pn = *n;
 162                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 163
 164                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 165                              sizeof (union ib_gid));
 166                 if (ret < 0)
 167                         n = &pn->rb_left;
 168                 else if (ret > 0)
 169                         n = &pn->rb_right;
 170                 else
 171                         return -EEXIST;
 172         }
 173
 174         rb_link_node(&mcast->rb_node, pn, n);
 175         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 176
 177         return 0;
 178 }
 179
 180 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 181                                    struct ib_sa_mcmember_rec *mcmember)
 182 {
 183         struct net_device *dev = mcast->dev;
 184         struct ipoib_dev_priv *priv = netdev_priv(dev);
 185         struct ipoib_ah *ah;
 186         int ret;
 187         int set_qkey = 0;
 188
 189         mcast->mcmember = *mcmember;
 190
 191         /* Set the cached Q_Key before we attach if it's the broadcast group */
 192         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 193                     sizeof (union ib_gid))) {
 194                 spin_lock_irq(&priv->lock);
 195                 if (!priv->broadcast) {
 196                         spin_unlock_irq(&priv->lock);
 197                         return -EAGAIN;
 198                 }
 199                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 200                 spin_unlock_irq(&priv->lock);
 201                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 202                 set_qkey = 1;
 203         }
 204
 205         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 206                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 207                         ipoib_warn(priv, "multicast group %pI6 already attached\n",
 208                                    mcast->mcmember.mgid.raw);
 209
 210                         return 0;
 211                 }
 212
 213                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 214                                          &mcast->mcmember.mgid, set_qkey);
 215                 if (ret < 0) {
 216                         ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
 217                                    mcast->mcmember.mgid.raw);
 218
 219                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 220                         return ret;
 221                 }
 222         }
 223
 224         {
 225                 struct ib_ah_attr av = {
 226                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 227                         .port_num      = priv->port,
 228                         .sl            = mcast->mcmember.sl,
 229                         .ah_flags      = IB_AH_GRH,
 230                         .static_rate   = mcast->mcmember.rate,
 231                         .grh           = {
 232                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 233                                 .hop_limit     = mcast->mcmember.hop_limit,
 234                                 .sgid_index    = 0,
 235                                 .traffic_class = mcast->mcmember.traffic_class
 236                         }
 237                 };
 238                 av.grh.dgid = mcast->mcmember.mgid;
 239
 240                 ah = ipoib_create_ah(dev, priv->pd, &av);
 241                 if (!ah) {
 242                         ipoib_warn(priv, "ib_address_create failed\n");
 243                 } else {
 244                         spin_lock_irq(&priv->lock);
 245                         mcast->ah = ah;
 246                         spin_unlock_irq(&priv->lock);
 247
 248                         ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
 249                                         mcast->mcmember.mgid.raw,
 250                                         mcast->ah->ah,
 251                                         be16_to_cpu(mcast->mcmember.mlid),
 252                                         mcast->mcmember.sl);
 253                 }
 254         }
 255
 256         /* actually send any queued packets */
 257         netif_tx_lock_bh(dev);
 258         while (!skb_queue_empty(&mcast->pkt_queue)) {
 259                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 260                 netif_tx_unlock_bh(dev);
 261
 262                 skb->dev = dev;
 263
 264                 if (!skb_dst(skb) || !skb_dst(skb)->neighbour) {
 265                         /* put pseudoheader back on for next time */
 266                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 267                 }
 268
 269                 if (dev_queue_xmit(skb))
 270                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 271                 netif_tx_lock_bh(dev);
 272         }
 273         netif_tx_unlock_bh(dev);
 274
 275         return 0;
 276 }
 277
 278 static int
 279 ipoib_mcast_sendonly_join_complete(int status,
 280                                    struct ib_sa_multicast *multicast)
 281 {
 282         struct ipoib_mcast *mcast = multicast->context;
 283         struct net_device *dev = mcast->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 %pI6, status %d\n",
 295                                         mcast->mcmember.mgid.raw, status);
 296
 297                 /* Flush out any queued packets */
 298                 netif_tx_lock_bh(dev);
 299                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 300                         ++dev->stats.tx_dropped;
 301                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 302                 }
 303                 netif_tx_unlock_bh(dev);
 304
 305                 /* Clear the busy flag so we try again */
 306                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
 307                                             &mcast->flags);
 308         }
 309         return status;
 310 }
 311
 312 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 313 {
 314         struct net_device *dev = mcast->dev;
 315         struct ipoib_dev_priv *priv = netdev_priv(dev);
 316         struct ib_sa_mcmember_rec rec = {
 317 #if 0                           /* Some SMs don't support send-only yet */
 318                 .join_state = 4
 319 #else
 320                 .join_state = 1
 321 #endif
 322         };
 323         int ret = 0;
 324
 325         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 326                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 327                 return -ENODEV;
 328         }
 329
 330         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 331                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 332                 return -EBUSY;
 333         }
 334
 335         rec.mgid     = mcast->mcmember.mgid;
 336         rec.port_gid = priv->local_gid;
 337         rec.pkey     = cpu_to_be16(priv->pkey);
 338
 339         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 340                                          priv->port, &rec,
 341                                          IB_SA_MCMEMBER_REC_MGID        |
 342                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 343                                          IB_SA_MCMEMBER_REC_PKEY        |
 344                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 345                                          GFP_ATOMIC,
 346                                          ipoib_mcast_sendonly_join_complete,
 347                                          mcast);
 348         if (IS_ERR(mcast->mc)) {
 349                 ret = PTR_ERR(mcast->mc);
 350                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 351                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
 352                            ret);
 353         } else {
 354                 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n",
 355                                 mcast->mcmember.mgid.raw);
 356         }
 357
 358         return ret;
 359 }
 360
 361 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 362 {
 363         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 364                                                    carrier_on_task);
 365
 366         /*
 367          * Take rtnl_lock to avoid racing with ipoib_stop() and
 368          * turning the carrier back on while a device is being
 369          * removed.
 370          */
 371         rtnl_lock();
 372         netif_carrier_on(priv->dev);
 373         rtnl_unlock();
 374 }
 375
 376 static int ipoib_mcast_join_complete(int status,
 377                                      struct ib_sa_multicast *multicast)
 378 {
 379         struct ipoib_mcast *mcast = multicast->context;
 380         struct net_device *dev = mcast->dev;
 381         struct ipoib_dev_priv *priv = netdev_priv(dev);
 382
 383         ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
 384                         mcast->mcmember.mgid.raw, status);
 385
 386         /* We trap for port events ourselves. */
 387         if (status == -ENETRESET)
 388                 return 0;
 389
 390         if (!status)
 391                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 392
 393         if (!status) {
 394                 mcast->backoff = 1;
 395                 mutex_lock(&mcast_mutex);
 396                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 397                         queue_delayed_work(ipoib_workqueue,
 398                                            &priv->mcast_task, 0);
 399                 mutex_unlock(&mcast_mutex);
 400
 401                 /*
 402                  * Defer carrier on work to ipoib_workqueue to avoid a
 403                  * deadlock on rtnl_lock here.
 404                  */
 405                 if (mcast == priv->broadcast)
 406                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
 407
 408                 return 0;
 409         }
 410
 411         if (mcast->logcount++ < 20) {
 412                 if (status == -ETIMEDOUT || status == -EAGAIN) {
 413                         ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
 414                                         mcast->mcmember.mgid.raw, status);
 415                 } else {
 416                         ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
 417                                    mcast->mcmember.mgid.raw, status);
 418                 }
 419         }
 420
 421         mcast->backoff *= 2;
 422         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 423                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 424
 425         /* Clear the busy flag so we try again */
 426         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 427
 428         mutex_lock(&mcast_mutex);
 429         spin_lock_irq(&priv->lock);
 430         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 431                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 432                                    mcast->backoff * HZ);
 433         spin_unlock_irq(&priv->lock);
 434         mutex_unlock(&mcast_mutex);
 435
 436         return status;
 437 }
 438
 439 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 440                              int create)
 441 {
 442         struct ipoib_dev_priv *priv = netdev_priv(dev);
 443         struct ib_sa_mcmember_rec rec = {
 444                 .join_state = 1
 445         };
 446         ib_sa_comp_mask comp_mask;
 447         int ret = 0;
 448
 449         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 450
 451         rec.mgid     = mcast->mcmember.mgid;
 452         rec.port_gid = priv->local_gid;
 453         rec.pkey     = cpu_to_be16(priv->pkey);
 454
 455         comp_mask =
 456                 IB_SA_MCMEMBER_REC_MGID         |
 457                 IB_SA_MCMEMBER_REC_PORT_GID     |
 458                 IB_SA_MCMEMBER_REC_PKEY         |
 459                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 460
 461         if (create) {
 462                 comp_mask |=
 463                         IB_SA_MCMEMBER_REC_QKEY                 |
 464                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 465                         IB_SA_MCMEMBER_REC_MTU                  |
 466                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 467                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 468                         IB_SA_MCMEMBER_REC_RATE                 |
 469                         IB_SA_MCMEMBER_REC_SL                   |
 470                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 471                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 472
 473                 rec.qkey          = priv->broadcast->mcmember.qkey;
 474                 rec.mtu_selector  = IB_SA_EQ;
 475                 rec.mtu           = priv->broadcast->mcmember.mtu;
 476                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 477                 rec.rate_selector = IB_SA_EQ;
 478                 rec.rate          = priv->broadcast->mcmember.rate;
 479                 rec.sl            = priv->broadcast->mcmember.sl;
 480                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 481                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 482         }
 483
 484         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 485         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 486                                          &rec, comp_mask, GFP_KERNEL,
 487                                          ipoib_mcast_join_complete, mcast);
 488         if (IS_ERR(mcast->mc)) {
 489                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 490                 ret = PTR_ERR(mcast->mc);
 491                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 492
 493                 mcast->backoff *= 2;
 494                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 495                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 496
 497                 mutex_lock(&mcast_mutex);
 498                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 499                         queue_delayed_work(ipoib_workqueue,
 500                                            &priv->mcast_task,
 501                                            mcast->backoff * HZ);
 502                 mutex_unlock(&mcast_mutex);
 503         }
 504 }
 505
 506 void ipoib_mcast_join_task(struct work_struct *work)
 507 {
 508         struct ipoib_dev_priv *priv =
 509                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 510         struct net_device *dev = priv->dev;
 511
 512         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 513                 return;
 514
 515         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 516                 ipoib_warn(priv, "ib_query_gid() failed\n");
 517         else
 518                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 519
 520         {
 521                 struct ib_port_attr attr;
 522
 523                 if (!ib_query_port(priv->ca, priv->port, &attr))
 524                         priv->local_lid = attr.lid;
 525                 else
 526                         ipoib_warn(priv, "ib_query_port failed\n");
 527         }
 528
 529         if (!priv->broadcast) {
 530                 struct ipoib_mcast *broadcast;
 531
 532                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 533                         return;
 534
 535                 broadcast = ipoib_mcast_alloc(dev, 1);
 536                 if (!broadcast) {
 537                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 538                         mutex_lock(&mcast_mutex);
 539                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 540                                 queue_delayed_work(ipoib_workqueue,
 541                                                    &priv->mcast_task, HZ);
 542                         mutex_unlock(&mcast_mutex);
 543                         return;
 544                 }
 545
 546                 spin_lock_irq(&priv->lock);
 547                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 548                        sizeof (union ib_gid));
 549                 priv->broadcast = broadcast;
 550
 551                 __ipoib_mcast_add(dev, priv->broadcast);
 552                 spin_unlock_irq(&priv->lock);
 553         }
 554
 555         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 556                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &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 = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 585
 586         if (!ipoib_cm_admin_enabled(dev)) {
 587                 rtnl_lock();
 588                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
 589                 rtnl_unlock();
 590         }
 591
 592         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 593
 594         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 595 }
 596
 597 int ipoib_mcast_start_thread(struct net_device *dev)
 598 {
 599         struct ipoib_dev_priv *priv = netdev_priv(dev);
 600
 601         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 602
 603         mutex_lock(&mcast_mutex);
 604         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 605                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 606         mutex_unlock(&mcast_mutex);
 607
 608         return 0;
 609 }
 610
 611 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 612 {
 613         struct ipoib_dev_priv *priv = netdev_priv(dev);
 614
 615         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 616
 617         mutex_lock(&mcast_mutex);
 618         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 619         cancel_delayed_work(&priv->mcast_task);
 620         mutex_unlock(&mcast_mutex);
 621
 622         if (flush)
 623                 flush_workqueue(ipoib_workqueue);
 624
 625         return 0;
 626 }
 627
 628 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 629 {
 630         struct ipoib_dev_priv *priv = netdev_priv(dev);
 631         int ret = 0;
 632
 633         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 634                 ib_sa_free_multicast(mcast->mc);
 635
 636         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 637                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 638                                 mcast->mcmember.mgid.raw);
 639
 640                 /* Remove ourselves from the multicast group */
 641                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 642                                       be16_to_cpu(mcast->mcmember.mlid));
 643                 if (ret)
 644                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 645         }
 646
 647         return 0;
 648 }
 649
 650 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 651 {
 652         struct ipoib_dev_priv *priv = netdev_priv(dev);
 653         struct ipoib_mcast *mcast;
 654         unsigned long flags;
 655
 656         spin_lock_irqsave(&priv->lock, flags);
 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 %pI6\n",
 670                                 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(skb)                &&
 711                     skb_dst(skb)->neighbour &&
 712                     !*to_ipoib_neigh(skb_dst(skb)->neighbour)) {
 713                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb_dst(skb)->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                 spin_unlock_irqrestore(&priv->lock, flags);
 724                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 725                 return;
 726         }
 727
 728 unlock:
 729         spin_unlock_irqrestore(&priv->lock, flags);
 730 }
 731
 732 void ipoib_mcast_dev_flush(struct net_device *dev)
 733 {
 734         struct ipoib_dev_priv *priv = netdev_priv(dev);
 735         LIST_HEAD(remove_list);
 736         struct ipoib_mcast *mcast, *tmcast;
 737         unsigned long flags;
 738
 739         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 740
 741         spin_lock_irqsave(&priv->lock, flags);
 742
 743         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 744                 list_del(&mcast->list);
 745                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 746                 list_add_tail(&mcast->list, &remove_list);
 747         }
 748
 749         if (priv->broadcast) {
 750                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 751                 list_add_tail(&priv->broadcast->list, &remove_list);
 752                 priv->broadcast = NULL;
 753         }
 754
 755         spin_unlock_irqrestore(&priv->lock, flags);
 756
 757         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 758                 ipoib_mcast_leave(dev, mcast);
 759                 ipoib_mcast_free(mcast);
 760         }
 761 }
 762
 763 void ipoib_mcast_restart_task(struct work_struct *work)
 764 {
 765         struct ipoib_dev_priv *priv =
 766                 container_of(work, struct ipoib_dev_priv, restart_task);
 767         struct net_device *dev = priv->dev;
 768         struct dev_mc_list *mclist;
 769         struct ipoib_mcast *mcast, *tmcast;
 770         LIST_HEAD(remove_list);
 771         unsigned long flags;
 772         struct ib_sa_mcmember_rec rec;
 773
 774         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 775
 776         ipoib_mcast_stop_thread(dev, 0);
 777
 778         local_irq_save(flags);
 779         netif_addr_lock(dev);
 780         spin_lock(&priv->lock);
 781
 782         /*
 783          * Unfortunately, the networking core only gives us a list of all of
 784          * the multicast hardware addresses. We need to figure out which ones
 785          * are new and which ones have been removed
 786          */
 787
 788         /* Clear out the found flag */
 789         list_for_each_entry(mcast, &priv->multicast_list, list)
 790                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 791
 792         /* Mark all of the entries that are found or don't exist */
 793         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 794                 union ib_gid mgid;
 795
 796                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 797
 798                 mcast = __ipoib_mcast_find(dev, &mgid);
 799                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 800                         struct ipoib_mcast *nmcast;
 801
 802                         /* ignore group which is directly joined by userspace */
 803                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 804                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 805                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 806                                                 mgid.raw);
 807                                 continue;
 808                         }
 809
 810                         /* Not found or send-only group, let's add a new entry */
 811                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 812                                         mgid.raw);
 813
 814                         nmcast = ipoib_mcast_alloc(dev, 0);
 815                         if (!nmcast) {
 816                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 817                                 continue;
 818                         }
 819
 820                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 821
 822                         nmcast->mcmember.mgid = mgid;
 823
 824                         if (mcast) {
 825                                 /* Destroy the send only entry */
 826                                 list_move_tail(&mcast->list, &remove_list);
 827
 828                                 rb_replace_node(&mcast->rb_node,
 829                                                 &nmcast->rb_node,
 830                                                 &priv->multicast_tree);
 831                         } else
 832                                 __ipoib_mcast_add(dev, nmcast);
 833
 834                         list_add_tail(&nmcast->list, &priv->multicast_list);
 835                 }
 836
 837                 if (mcast)
 838                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 839         }
 840
 841         /* Remove all of the entries don't exist anymore */
 842         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 843                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 844                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 845                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 846                                         mcast->mcmember.mgid.raw);
 847
 848                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 849
 850                         /* Move to the remove list */
 851                         list_move_tail(&mcast->list, &remove_list);
 852                 }
 853         }
 854
 855         spin_unlock(&priv->lock);
 856         netif_addr_unlock(dev);
 857         local_irq_restore(flags);
 858
 859         /* We have to cancel outside of the spinlock */
 860         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 861                 ipoib_mcast_leave(mcast->dev, mcast);
 862                 ipoib_mcast_free(mcast);
 863         }
 864
 865         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 866                 ipoib_mcast_start_thread(dev);
 867 }
 868
 869 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 870
 871 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 872 {
 873         struct ipoib_mcast_iter *iter;
 874
 875         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 876         if (!iter)
 877                 return NULL;
 878
 879         iter->dev = dev;
 880         memset(iter->mgid.raw, 0, 16);
 881
 882         if (ipoib_mcast_iter_next(iter)) {
 883                 kfree(iter);
 884                 return NULL;
 885         }
 886
 887         return iter;
 888 }
 889
 890 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 891 {
 892         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 893         struct rb_node *n;
 894         struct ipoib_mcast *mcast;
 895         int ret = 1;
 896
 897         spin_lock_irq(&priv->lock);
 898
 899         n = rb_first(&priv->multicast_tree);
 900
 901         while (n) {
 902                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 903
 904                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 905                            sizeof (union ib_gid)) < 0) {
 906                         iter->mgid      = mcast->mcmember.mgid;
 907                         iter->created   = mcast->created;
 908                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 909                         iter->complete  = !!mcast->ah;
 910                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 911
 912                         ret = 0;
 913
 914                         break;
 915                 }
 916
 917                 n = rb_next(n);
 918         }
 919
 920         spin_unlock_irq(&priv->lock);
 921
 922         return ret;
 923 }
 924
 925 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 926                            union ib_gid *mgid,
 927                            unsigned long *created,
 928                            unsigned int *queuelen,
 929                            unsigned int *complete,
 930                            unsigned int *send_only)
 931 {
 932         *mgid      = iter->mgid;
 933         *created   = iter->created;
 934         *queuelen  = iter->queuelen;
 935         *complete  = iter->complete;
 936         *send_only = iter->send_only;
 937 }
 938
 939 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */