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