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 #include <linux/slab.h>
  44
  45 #include <net/dst.h>
  46
  47 #include "ipoib.h"
  48
  49 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  50 static int mcast_debug_level;
  51
  52 module_param(mcast_debug_level, int, 0644);
  53 MODULE_PARM_DESC(mcast_debug_level,
  54                  "Enable multicast debug tracing if > 0");
  55 #endif
  56
  57 static DEFINE_MUTEX(mcast_mutex);
  58
  59 struct ipoib_mcast_iter {
  60         struct net_device *dev;
  61         union ib_gid       mgid;
  62         unsigned long      created;
  63         unsigned int       queuelen;
  64         unsigned int       complete;
  65         unsigned int       send_only;
  66 };
  67
  68 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  69 {
  70         struct net_device *dev = mcast->dev;
  71         struct ipoib_dev_priv *priv = netdev_priv(dev);
  72         struct ipoib_neigh *neigh, *tmp;
  73         int tx_dropped = 0;
  74
  75         ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
  76                         mcast->mcmember.mgid.raw);
  77
  78         spin_lock_irq(&priv->lock);
  79
  80         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
  81                 /*
  82                  * It's safe to call ipoib_put_ah() inside priv->lock
  83                  * here, because we know that mcast->ah will always
  84                  * hold one more reference, so ipoib_put_ah() will
  85                  * never do more than decrement the ref count.
  86                  */
  87                 if (neigh->ah)
  88                         ipoib_put_ah(neigh->ah);
  89                 ipoib_neigh_free(dev, neigh);
  90         }
  91
  92         spin_unlock_irq(&priv->lock);
  93
  94         if (mcast->ah)
  95                 ipoib_put_ah(mcast->ah);
  96
  97         while (!skb_queue_empty(&mcast->pkt_queue)) {
  98                 ++tx_dropped;
  99                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 100         }
 101
 102         netif_tx_lock_bh(dev);
 103         dev->stats.tx_dropped += tx_dropped;
 104         netif_tx_unlock_bh(dev);
 105
 106         kfree(mcast);
 107 }
 108
 109 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 110                                              int can_sleep)
 111 {
 112         struct ipoib_mcast *mcast;
 113
 114         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 115         if (!mcast)
 116                 return NULL;
 117
 118         mcast->dev = dev;
 119         mcast->created = jiffies;
 120         mcast->backoff = 1;
 121
 122         INIT_LIST_HEAD(&mcast->list);
 123         INIT_LIST_HEAD(&mcast->neigh_list);
 124         skb_queue_head_init(&mcast->pkt_queue);
 125
 126         return mcast;
 127 }
 128
 129 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
 130 {
 131         struct ipoib_dev_priv *priv = netdev_priv(dev);
 132         struct rb_node *n = priv->multicast_tree.rb_node;
 133
 134         while (n) {
 135                 struct ipoib_mcast *mcast;
 136                 int ret;
 137
 138                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 139
 140                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 141                              sizeof (union ib_gid));
 142                 if (ret < 0)
 143                         n = n->rb_left;
 144                 else if (ret > 0)
 145                         n = n->rb_right;
 146                 else
 147                         return mcast;
 148         }
 149
 150         return NULL;
 151 }
 152
 153 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 154 {
 155         struct ipoib_dev_priv *priv = netdev_priv(dev);
 156         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 157
 158         while (*n) {
 159                 struct ipoib_mcast *tmcast;
 160                 int ret;
 161
 162                 pn = *n;
 163                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 164
 165                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 166                              sizeof (union ib_gid));
 167                 if (ret < 0)
 168                         n = &pn->rb_left;
 169                 else if (ret > 0)
 170                         n = &pn->rb_right;
 171                 else
 172                         return -EEXIST;
 173         }
 174
 175         rb_link_node(&mcast->rb_node, pn, n);
 176         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 177
 178         return 0;
 179 }
 180
 181 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 182                                    struct ib_sa_mcmember_rec *mcmember)
 183 {
 184         struct net_device *dev = mcast->dev;
 185         struct ipoib_dev_priv *priv = netdev_priv(dev);
 186         struct ipoib_ah *ah;
 187         int ret;
 188         int set_qkey = 0;
 189
 190         mcast->mcmember = *mcmember;
 191
 192         /* Set the cached Q_Key before we attach if it's the broadcast group */
 193         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 194                     sizeof (union ib_gid))) {
 195                 spin_lock_irq(&priv->lock);
 196                 if (!priv->broadcast) {
 197                         spin_unlock_irq(&priv->lock);
 198                         return -EAGAIN;
 199                 }
 200                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 201                 spin_unlock_irq(&priv->lock);
 202                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 203                 set_qkey = 1;
 204         }
 205
 206         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 207                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 208                         ipoib_warn(priv, "multicast group %pI6 already attached\n",
 209                                    mcast->mcmember.mgid.raw);
 210
 211                         return 0;
 212                 }
 213
 214                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 215                                          &mcast->mcmember.mgid, set_qkey);
 216                 if (ret < 0) {
 217                         ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
 218                                    mcast->mcmember.mgid.raw);
 219
 220                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 221                         return ret;
 222                 }
 223         }
 224
 225         {
 226                 struct ib_ah_attr av = {
 227                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 228                         .port_num      = priv->port,
 229                         .sl            = mcast->mcmember.sl,
 230                         .ah_flags      = IB_AH_GRH,
 231                         .static_rate   = mcast->mcmember.rate,
 232                         .grh           = {
 233                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 234                                 .hop_limit     = mcast->mcmember.hop_limit,
 235                                 .sgid_index    = 0,
 236                                 .traffic_class = mcast->mcmember.traffic_class
 237                         }
 238                 };
 239                 av.grh.dgid = mcast->mcmember.mgid;
 240
 241                 ah = ipoib_create_ah(dev, priv->pd, &av);
 242                 if (!ah) {
 243                         ipoib_warn(priv, "ib_address_create failed\n");
 244                 } else {
 245                         spin_lock_irq(&priv->lock);
 246                         mcast->ah = ah;
 247                         spin_unlock_irq(&priv->lock);
 248
 249                         ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
 250                                         mcast->mcmember.mgid.raw,
 251                                         mcast->ah->ah,
 252                                         be16_to_cpu(mcast->mcmember.mlid),
 253                                         mcast->mcmember.sl);
 254                 }
 255         }
 256
 257         /* actually send any queued packets */
 258         netif_tx_lock_bh(dev);
 259         while (!skb_queue_empty(&mcast->pkt_queue)) {
 260                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 261                 struct dst_entry *dst = skb_dst(skb);
 262                 struct neighbour *n = NULL;
 263
 264                 netif_tx_unlock_bh(dev);
 265
 266                 skb->dev = dev;
 267                 if (dst)
 268                         n = dst_get_neighbour(dst);
 269                 if (!dst || !n) {
 270                         /* put pseudoheader back on for next time */
 271                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 272                 }
 273
 274                 if (dev_queue_xmit(skb))
 275                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 276                 netif_tx_lock_bh(dev);
 277         }
 278         netif_tx_unlock_bh(dev);
 279
 280         return 0;
 281 }
 282
 283 static int
 284 ipoib_mcast_sendonly_join_complete(int status,
 285                                    struct ib_sa_multicast *multicast)
 286 {
 287         struct ipoib_mcast *mcast = multicast->context;
 288         struct net_device *dev = mcast->dev;
 289
 290         /* We trap for port events ourselves. */
 291         if (status == -ENETRESET)
 292                 return 0;
 293
 294         if (!status)
 295                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 296
 297         if (status) {
 298                 if (mcast->logcount++ < 20)
 299                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for %pI6, status %d\n",
 300                                         mcast->mcmember.mgid.raw, status);
 301
 302                 /* Flush out any queued packets */
 303                 netif_tx_lock_bh(dev);
 304                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 305                         ++dev->stats.tx_dropped;
 306                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 307                 }
 308                 netif_tx_unlock_bh(dev);
 309
 310                 /* Clear the busy flag so we try again */
 311                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
 312                                             &mcast->flags);
 313         }
 314         return status;
 315 }
 316
 317 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 318 {
 319         struct net_device *dev = mcast->dev;
 320         struct ipoib_dev_priv *priv = netdev_priv(dev);
 321         struct ib_sa_mcmember_rec rec = {
 322 #if 0                           /* Some SMs don't support send-only yet */
 323                 .join_state = 4
 324 #else
 325                 .join_state = 1
 326 #endif
 327         };
 328         int ret = 0;
 329
 330         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 331                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 332                 return -ENODEV;
 333         }
 334
 335         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 336                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 337                 return -EBUSY;
 338         }
 339
 340         rec.mgid     = mcast->mcmember.mgid;
 341         rec.port_gid = priv->local_gid;
 342         rec.pkey     = cpu_to_be16(priv->pkey);
 343
 344         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 345                                          priv->port, &rec,
 346                                          IB_SA_MCMEMBER_REC_MGID        |
 347                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 348                                          IB_SA_MCMEMBER_REC_PKEY        |
 349                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 350                                          GFP_ATOMIC,
 351                                          ipoib_mcast_sendonly_join_complete,
 352                                          mcast);
 353         if (IS_ERR(mcast->mc)) {
 354                 ret = PTR_ERR(mcast->mc);
 355                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 356                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
 357                            ret);
 358         } else {
 359                 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n",
 360                                 mcast->mcmember.mgid.raw);
 361         }
 362
 363         return ret;
 364 }
 365
 366 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 367 {
 368         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 369                                                    carrier_on_task);
 370         struct ib_port_attr attr;
 371
 372         /*
 373          * Take rtnl_lock to avoid racing with ipoib_stop() and
 374          * turning the carrier back on while a device is being
 375          * removed.
 376          */
 377         if (ib_query_port(priv->ca, priv->port, &attr) ||
 378             attr.state != IB_PORT_ACTIVE) {
 379                 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
 380                 return;
 381         }
 382
 383         rtnl_lock();
 384         netif_carrier_on(priv->dev);
 385         rtnl_unlock();
 386 }
 387
 388 static int ipoib_mcast_join_complete(int status,
 389                                      struct ib_sa_multicast *multicast)
 390 {
 391         struct ipoib_mcast *mcast = multicast->context;
 392         struct net_device *dev = mcast->dev;
 393         struct ipoib_dev_priv *priv = netdev_priv(dev);
 394
 395         ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
 396                         mcast->mcmember.mgid.raw, status);
 397
 398         /* We trap for port events ourselves. */
 399         if (status == -ENETRESET)
 400                 return 0;
 401
 402         if (!status)
 403                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 404
 405         if (!status) {
 406                 mcast->backoff = 1;
 407                 mutex_lock(&mcast_mutex);
 408                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 409                         queue_delayed_work(ipoib_workqueue,
 410                                            &priv->mcast_task, 0);
 411                 mutex_unlock(&mcast_mutex);
 412
 413                 /*
 414                  * Defer carrier on work to ipoib_workqueue to avoid a
 415                  * deadlock on rtnl_lock here.
 416                  */
 417                 if (mcast == priv->broadcast)
 418                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
 419
 420                 return 0;
 421         }
 422
 423         if (mcast->logcount++ < 20) {
 424                 if (status == -ETIMEDOUT || status == -EAGAIN) {
 425                         ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
 426                                         mcast->mcmember.mgid.raw, status);
 427                 } else {
 428                         ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
 429                                    mcast->mcmember.mgid.raw, status);
 430                 }
 431         }
 432
 433         mcast->backoff *= 2;
 434         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 435                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 436
 437         /* Clear the busy flag so we try again */
 438         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 439
 440         mutex_lock(&mcast_mutex);
 441         spin_lock_irq(&priv->lock);
 442         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 443                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 444                                    mcast->backoff * HZ);
 445         spin_unlock_irq(&priv->lock);
 446         mutex_unlock(&mcast_mutex);
 447
 448         return status;
 449 }
 450
 451 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 452                              int create)
 453 {
 454         struct ipoib_dev_priv *priv = netdev_priv(dev);
 455         struct ib_sa_mcmember_rec rec = {
 456                 .join_state = 1
 457         };
 458         ib_sa_comp_mask comp_mask;
 459         int ret = 0;
 460
 461         ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
 462
 463         rec.mgid     = mcast->mcmember.mgid;
 464         rec.port_gid = priv->local_gid;
 465         rec.pkey     = cpu_to_be16(priv->pkey);
 466
 467         comp_mask =
 468                 IB_SA_MCMEMBER_REC_MGID         |
 469                 IB_SA_MCMEMBER_REC_PORT_GID     |
 470                 IB_SA_MCMEMBER_REC_PKEY         |
 471                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 472
 473         if (create) {
 474                 comp_mask |=
 475                         IB_SA_MCMEMBER_REC_QKEY                 |
 476                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 477                         IB_SA_MCMEMBER_REC_MTU                  |
 478                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 479                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 480                         IB_SA_MCMEMBER_REC_RATE                 |
 481                         IB_SA_MCMEMBER_REC_SL                   |
 482                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 483                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 484
 485                 rec.qkey          = priv->broadcast->mcmember.qkey;
 486                 rec.mtu_selector  = IB_SA_EQ;
 487                 rec.mtu           = priv->broadcast->mcmember.mtu;
 488                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 489                 rec.rate_selector = IB_SA_EQ;
 490                 rec.rate          = priv->broadcast->mcmember.rate;
 491                 rec.sl            = priv->broadcast->mcmember.sl;
 492                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 493                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 494         }
 495
 496         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 497         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 498                                          &rec, comp_mask, GFP_KERNEL,
 499                                          ipoib_mcast_join_complete, mcast);
 500         if (IS_ERR(mcast->mc)) {
 501                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 502                 ret = PTR_ERR(mcast->mc);
 503                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 504
 505                 mcast->backoff *= 2;
 506                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 507                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 508
 509                 mutex_lock(&mcast_mutex);
 510                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 511                         queue_delayed_work(ipoib_workqueue,
 512                                            &priv->mcast_task,
 513                                            mcast->backoff * HZ);
 514                 mutex_unlock(&mcast_mutex);
 515         }
 516 }
 517
 518 void ipoib_mcast_join_task(struct work_struct *work)
 519 {
 520         struct ipoib_dev_priv *priv =
 521                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 522         struct net_device *dev = priv->dev;
 523
 524         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 525                 return;
 526
 527         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 528                 ipoib_warn(priv, "ib_query_gid() failed\n");
 529         else
 530                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 531
 532         {
 533                 struct ib_port_attr attr;
 534
 535                 if (!ib_query_port(priv->ca, priv->port, &attr))
 536                         priv->local_lid = attr.lid;
 537                 else
 538                         ipoib_warn(priv, "ib_query_port failed\n");
 539         }
 540
 541         if (!priv->broadcast) {
 542                 struct ipoib_mcast *broadcast;
 543
 544                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 545                         return;
 546
 547                 broadcast = ipoib_mcast_alloc(dev, 1);
 548                 if (!broadcast) {
 549                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 550                         mutex_lock(&mcast_mutex);
 551                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 552                                 queue_delayed_work(ipoib_workqueue,
 553                                                    &priv->mcast_task, HZ);
 554                         mutex_unlock(&mcast_mutex);
 555                         return;
 556                 }
 557
 558                 spin_lock_irq(&priv->lock);
 559                 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 560                        sizeof (union ib_gid));
 561                 priv->broadcast = broadcast;
 562
 563                 __ipoib_mcast_add(dev, priv->broadcast);
 564                 spin_unlock_irq(&priv->lock);
 565         }
 566
 567         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 568                 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 569                         ipoib_mcast_join(dev, priv->broadcast, 0);
 570                 return;
 571         }
 572
 573         while (1) {
 574                 struct ipoib_mcast *mcast = NULL;
 575
 576                 spin_lock_irq(&priv->lock);
 577                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 578                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 579                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 580                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 581                                 /* Found the next unjoined group */
 582                                 break;
 583                         }
 584                 }
 585                 spin_unlock_irq(&priv->lock);
 586
 587                 if (&mcast->list == &priv->multicast_list) {
 588                         /* All done */
 589                         break;
 590                 }
 591
 592                 ipoib_mcast_join(dev, mcast, 1);
 593                 return;
 594         }
 595
 596         priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 597
 598         if (!ipoib_cm_admin_enabled(dev)) {
 599                 rtnl_lock();
 600                 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
 601                 rtnl_unlock();
 602         }
 603
 604         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 605
 606         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 607 }
 608
 609 int ipoib_mcast_start_thread(struct net_device *dev)
 610 {
 611         struct ipoib_dev_priv *priv = netdev_priv(dev);
 612
 613         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 614
 615         mutex_lock(&mcast_mutex);
 616         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 617                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 618         mutex_unlock(&mcast_mutex);
 619
 620         return 0;
 621 }
 622
 623 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 624 {
 625         struct ipoib_dev_priv *priv = netdev_priv(dev);
 626
 627         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 628
 629         mutex_lock(&mcast_mutex);
 630         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 631         cancel_delayed_work(&priv->mcast_task);
 632         mutex_unlock(&mcast_mutex);
 633
 634         if (flush)
 635                 flush_workqueue(ipoib_workqueue);
 636
 637         return 0;
 638 }
 639
 640 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 641 {
 642         struct ipoib_dev_priv *priv = netdev_priv(dev);
 643         int ret = 0;
 644
 645         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 646                 ib_sa_free_multicast(mcast->mc);
 647
 648         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 649                 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
 650                                 mcast->mcmember.mgid.raw);
 651
 652                 /* Remove ourselves from the multicast group */
 653                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 654                                       be16_to_cpu(mcast->mcmember.mlid));
 655                 if (ret)
 656                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 657         }
 658
 659         return 0;
 660 }
 661
 662 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
 663 {
 664         struct ipoib_dev_priv *priv = netdev_priv(dev);
 665         struct ipoib_mcast *mcast;
 666         unsigned long flags;
 667
 668         spin_lock_irqsave(&priv->lock, flags);
 669
 670         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 671             !priv->broadcast                                    ||
 672             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 673                 ++dev->stats.tx_dropped;
 674                 dev_kfree_skb_any(skb);
 675                 goto unlock;
 676         }
 677
 678         mcast = __ipoib_mcast_find(dev, mgid);
 679         if (!mcast) {
 680                 /* Let's create a new send only group now */
 681                 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
 682                                 mgid);
 683
 684                 mcast = ipoib_mcast_alloc(dev, 0);
 685                 if (!mcast) {
 686                         ipoib_warn(priv, "unable to allocate memory for "
 687                                    "multicast structure\n");
 688                         ++dev->stats.tx_dropped;
 689                         dev_kfree_skb_any(skb);
 690                         goto out;
 691                 }
 692
 693                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 694                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 695                 __ipoib_mcast_add(dev, mcast);
 696                 list_add_tail(&mcast->list, &priv->multicast_list);
 697         }
 698
 699         if (!mcast->ah) {
 700                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 701                         skb_queue_tail(&mcast->pkt_queue, skb);
 702                 else {
 703                         ++dev->stats.tx_dropped;
 704                         dev_kfree_skb_any(skb);
 705                 }
 706
 707                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 708                         ipoib_dbg_mcast(priv, "no address vector, "
 709                                         "but multicast join already started\n");
 710                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 711                         ipoib_mcast_sendonly_join(mcast);
 712
 713                 /*
 714                  * If lookup completes between here and out:, don't
 715                  * want to send packet twice.
 716                  */
 717                 mcast = NULL;
 718         }
 719
 720 out:
 721         if (mcast && mcast->ah) {
 722                 struct dst_entry *dst = skb_dst(skb);
 723                 struct neighbour *n = NULL;
 724                 if (dst)
 725                         n = dst_get_neighbour(dst);
 726                 if (n && !*to_ipoib_neigh(n)) {
 727                         struct ipoib_neigh *neigh = ipoib_neigh_alloc(n,
 728                                                                       skb->dev);
 729
 730                         if (neigh) {
 731                                 kref_get(&mcast->ah->ref);
 732                                 neigh->ah       = mcast->ah;
 733                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 734                         }
 735                 }
 736
 737                 spin_unlock_irqrestore(&priv->lock, flags);
 738                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 739                 return;
 740         }
 741
 742 unlock:
 743         spin_unlock_irqrestore(&priv->lock, flags);
 744 }
 745
 746 void ipoib_mcast_dev_flush(struct net_device *dev)
 747 {
 748         struct ipoib_dev_priv *priv = netdev_priv(dev);
 749         LIST_HEAD(remove_list);
 750         struct ipoib_mcast *mcast, *tmcast;
 751         unsigned long flags;
 752
 753         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 754
 755         spin_lock_irqsave(&priv->lock, flags);
 756
 757         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 758                 list_del(&mcast->list);
 759                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 760                 list_add_tail(&mcast->list, &remove_list);
 761         }
 762
 763         if (priv->broadcast) {
 764                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 765                 list_add_tail(&priv->broadcast->list, &remove_list);
 766                 priv->broadcast = NULL;
 767         }
 768
 769         spin_unlock_irqrestore(&priv->lock, flags);
 770
 771         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 772                 ipoib_mcast_leave(dev, mcast);
 773                 ipoib_mcast_free(mcast);
 774         }
 775 }
 776
 777 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
 778 {
 779         /* reserved QPN, prefix, scope */
 780         if (memcmp(addr, broadcast, 6))
 781                 return 0;
 782         /* signature lower, pkey */
 783         if (memcmp(addr + 7, broadcast + 7, 3))
 784                 return 0;
 785         return 1;
 786 }
 787
 788 void ipoib_mcast_restart_task(struct work_struct *work)
 789 {
 790         struct ipoib_dev_priv *priv =
 791                 container_of(work, struct ipoib_dev_priv, restart_task);
 792         struct net_device *dev = priv->dev;
 793         struct netdev_hw_addr *ha;
 794         struct ipoib_mcast *mcast, *tmcast;
 795         LIST_HEAD(remove_list);
 796         unsigned long flags;
 797         struct ib_sa_mcmember_rec rec;
 798
 799         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 800
 801         ipoib_mcast_stop_thread(dev, 0);
 802
 803         local_irq_save(flags);
 804         netif_addr_lock(dev);
 805         spin_lock(&priv->lock);
 806
 807         /*
 808          * Unfortunately, the networking core only gives us a list of all of
 809          * the multicast hardware addresses. We need to figure out which ones
 810          * are new and which ones have been removed
 811          */
 812
 813         /* Clear out the found flag */
 814         list_for_each_entry(mcast, &priv->multicast_list, list)
 815                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 816
 817         /* Mark all of the entries that are found or don't exist */
 818         netdev_for_each_mc_addr(ha, dev) {
 819                 union ib_gid mgid;
 820
 821                 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
 822                         continue;
 823
 824                 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
 825
 826                 mcast = __ipoib_mcast_find(dev, &mgid);
 827                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 828                         struct ipoib_mcast *nmcast;
 829
 830                         /* ignore group which is directly joined by userspace */
 831                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 832                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 833                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
 834                                                 mgid.raw);
 835                                 continue;
 836                         }
 837
 838                         /* Not found or send-only group, let's add a new entry */
 839                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
 840                                         mgid.raw);
 841
 842                         nmcast = ipoib_mcast_alloc(dev, 0);
 843                         if (!nmcast) {
 844                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 845                                 continue;
 846                         }
 847
 848                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 849
 850                         nmcast->mcmember.mgid = mgid;
 851
 852                         if (mcast) {
 853                                 /* Destroy the send only entry */
 854                                 list_move_tail(&mcast->list, &remove_list);
 855
 856                                 rb_replace_node(&mcast->rb_node,
 857                                                 &nmcast->rb_node,
 858                                                 &priv->multicast_tree);
 859                         } else
 860                                 __ipoib_mcast_add(dev, nmcast);
 861
 862                         list_add_tail(&nmcast->list, &priv->multicast_list);
 863                 }
 864
 865                 if (mcast)
 866                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 867         }
 868
 869         /* Remove all of the entries don't exist anymore */
 870         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 871                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 872                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 873                         ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
 874                                         mcast->mcmember.mgid.raw);
 875
 876                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 877
 878                         /* Move to the remove list */
 879                         list_move_tail(&mcast->list, &remove_list);
 880                 }
 881         }
 882
 883         spin_unlock(&priv->lock);
 884         netif_addr_unlock(dev);
 885         local_irq_restore(flags);
 886
 887         /* We have to cancel outside of the spinlock */
 888         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 889                 ipoib_mcast_leave(mcast->dev, mcast);
 890                 ipoib_mcast_free(mcast);
 891         }
 892
 893         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 894                 ipoib_mcast_start_thread(dev);
 895 }
 896
 897 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 898
 899 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 900 {
 901         struct ipoib_mcast_iter *iter;
 902
 903         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 904         if (!iter)
 905                 return NULL;
 906
 907         iter->dev = dev;
 908         memset(iter->mgid.raw, 0, 16);
 909
 910         if (ipoib_mcast_iter_next(iter)) {
 911                 kfree(iter);
 912                 return NULL;
 913         }
 914
 915         return iter;
 916 }
 917
 918 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 919 {
 920         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 921         struct rb_node *n;
 922         struct ipoib_mcast *mcast;
 923         int ret = 1;
 924
 925         spin_lock_irq(&priv->lock);
 926
 927         n = rb_first(&priv->multicast_tree);
 928
 929         while (n) {
 930                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 931
 932                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 933                            sizeof (union ib_gid)) < 0) {
 934                         iter->mgid      = mcast->mcmember.mgid;
 935                         iter->created   = mcast->created;
 936                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 937                         iter->complete  = !!mcast->ah;
 938                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 939
 940                         ret = 0;
 941
 942                         break;
 943                 }
 944
 945                 n = rb_next(n);
 946         }
 947
 948         spin_unlock_irq(&priv->lock);
 949
 950         return ret;
 951 }
 952
 953 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 954                            union ib_gid *mgid,
 955                            unsigned long *created,
 956                            unsigned int *queuelen,
 957                            unsigned int *complete,
 958                            unsigned int *send_only)
 959 {
 960         *mgid      = iter->mgid;
 961         *created   = iter->created;
 962         *queuelen  = iter->queuelen;
 963         *complete  = iter->complete;
 964         *send_only = iter->send_only;
 965 }
 966
 967 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */