drivers/infiniband/ulp/ipoib/ipoib_multicast.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  * $Id: ipoib_multicast.c 1362 2004-12-18 15:56:29Z roland $
  35  */
  36
  37 #include <linux/skbuff.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/ip.h>
  40 #include <linux/in.h>
  41 #include <linux/igmp.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/delay.h>
  44 #include <linux/completion.h>
  45
  46 #include "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 DECLARE_MUTEX(mcast_mutex);
  57
  58 /* Used for all multicast joins (broadcast, IPv4 mcast and IPv6 mcast) */
  59 struct ipoib_mcast {
  60         struct ib_sa_mcmember_rec mcmember;
  61         struct ipoib_ah          *ah;
  62
  63         struct rb_node    rb_node;
  64         struct list_head  list;
  65         struct completion done;
  66
  67         int                 query_id;
  68         struct ib_sa_query *query;
  69
  70         unsigned long created;
  71         unsigned long backoff;
  72
  73         unsigned long flags;
  74         unsigned char logcount;
  75
  76         struct list_head  neigh_list;
  77
  78         struct sk_buff_head pkt_queue;
  79
  80         struct net_device *dev;
  81 };
  82
  83 struct ipoib_mcast_iter {
  84         struct net_device *dev;
  85         union ib_gid       mgid;
  86         unsigned long      created;
  87         unsigned int       queuelen;
  88         unsigned int       complete;
  89         unsigned int       send_only;
  90 };
  91
  92 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  93 {
  94         struct net_device *dev = mcast->dev;
  95         struct ipoib_dev_priv *priv = netdev_priv(dev);
  96         struct ipoib_neigh *neigh, *tmp;
  97         unsigned long flags;
  98         LIST_HEAD(ah_list);
  99         struct ipoib_ah *ah, *tah;
 100
 101         ipoib_dbg_mcast(netdev_priv(dev),
 102                         "deleting multicast group " IPOIB_GID_FMT "\n",
 103                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 104
 105         spin_lock_irqsave(&priv->lock, flags);
 106
 107         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
 108                 if (neigh->ah)
 109                         list_add_tail(&neigh->ah->list, &ah_list);
 110                 *to_ipoib_neigh(neigh->neighbour) = NULL;
 111                 neigh->neighbour->ops->destructor = NULL;
 112                 kfree(neigh);
 113         }
 114
 115         spin_unlock_irqrestore(&priv->lock, flags);
 116
 117         list_for_each_entry_safe(ah, tah, &ah_list, list)
 118                 ipoib_put_ah(ah);
 119
 120         if (mcast->ah)
 121                 ipoib_put_ah(mcast->ah);
 122
 123         while (!skb_queue_empty(&mcast->pkt_queue)) {
 124                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 125
 126                 skb->dev = dev;
 127                 dev_kfree_skb_any(skb);
 128         }
 129
 130         kfree(mcast);
 131 }
 132
 133 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 134                                              int can_sleep)
 135 {
 136         struct ipoib_mcast *mcast;
 137
 138         mcast = kmalloc(sizeof (*mcast), can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 139         if (!mcast)
 140                 return NULL;
 141
 142         memset(mcast, 0, sizeof (*mcast));
 143
 144         init_completion(&mcast->done);
 145
 146         mcast->dev = dev;
 147         mcast->created = jiffies;
 148         mcast->backoff = HZ;
 149         mcast->logcount = 0;
 150
 151         INIT_LIST_HEAD(&mcast->list);
 152         INIT_LIST_HEAD(&mcast->neigh_list);
 153         skb_queue_head_init(&mcast->pkt_queue);
 154
 155         mcast->ah    = NULL;
 156         mcast->query = NULL;
 157
 158         return mcast;
 159 }
 160
 161 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, union ib_gid *mgid)
 162 {
 163         struct ipoib_dev_priv *priv = netdev_priv(dev);
 164         struct rb_node *n = priv->multicast_tree.rb_node;
 165
 166         while (n) {
 167                 struct ipoib_mcast *mcast;
 168                 int ret;
 169
 170                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 171
 172                 ret = memcmp(mgid->raw, mcast->mcmember.mgid.raw,
 173                              sizeof (union ib_gid));
 174                 if (ret < 0)
 175                         n = n->rb_left;
 176                 else if (ret > 0)
 177                         n = n->rb_right;
 178                 else
 179                         return mcast;
 180         }
 181
 182         return NULL;
 183 }
 184
 185 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 186 {
 187         struct ipoib_dev_priv *priv = netdev_priv(dev);
 188         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 189
 190         while (*n) {
 191                 struct ipoib_mcast *tmcast;
 192                 int ret;
 193
 194                 pn = *n;
 195                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 196
 197                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 198                              sizeof (union ib_gid));
 199                 if (ret < 0)
 200                         n = &pn->rb_left;
 201                 else if (ret > 0)
 202                         n = &pn->rb_right;
 203                 else
 204                         return -EEXIST;
 205         }
 206
 207         rb_link_node(&mcast->rb_node, pn, n);
 208         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 209
 210         return 0;
 211 }
 212
 213 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 214                                    struct ib_sa_mcmember_rec *mcmember)
 215 {
 216         struct net_device *dev = mcast->dev;
 217         struct ipoib_dev_priv *priv = netdev_priv(dev);
 218         int ret;
 219
 220         mcast->mcmember = *mcmember;
 221
 222         /* Set the cached Q_Key before we attach if it's the broadcast group */
 223         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 224                     sizeof (union ib_gid))) {
 225                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 226                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 227         }
 228
 229         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 230                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 231                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 232                                    " already attached\n",
 233                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 234
 235                         return 0;
 236                 }
 237
 238                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 239                                          &mcast->mcmember.mgid);
 240                 if (ret < 0) {
 241                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 242                                    IPOIB_GID_FMT "\n",
 243                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 244
 245                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 246                         return ret;
 247                 }
 248         }
 249
 250         {
 251                 struct ib_ah_attr av = {
 252                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 253                         .port_num      = priv->port,
 254                         .sl            = mcast->mcmember.sl,
 255                         .ah_flags      = IB_AH_GRH,
 256                         .grh           = {
 257                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 258                                 .hop_limit     = mcast->mcmember.hop_limit,
 259                                 .sgid_index    = 0,
 260                                 .traffic_class = mcast->mcmember.traffic_class
 261                         }
 262                 };
 263                 int path_rate = ib_sa_rate_enum_to_int(mcast->mcmember.rate);
 264
 265                 av.grh.dgid = mcast->mcmember.mgid;
 266
 267                 if (path_rate > 0 && priv->local_rate > path_rate)
 268                         av.static_rate = (priv->local_rate - 1) / path_rate;
 269
 270                 ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n",
 271                                 av.static_rate, priv->local_rate,
 272                                 ib_sa_rate_enum_to_int(mcast->mcmember.rate));
 273
 274                 mcast->ah = ipoib_create_ah(dev, priv->pd, &av);
 275                 if (!mcast->ah) {
 276                         ipoib_warn(priv, "ib_address_create failed\n");
 277                 } else {
 278                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 279                                         " AV %p, LID 0x%04x, SL %d\n",
 280                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 281                                         mcast->ah->ah,
 282                                         be16_to_cpu(mcast->mcmember.mlid),
 283                                         mcast->mcmember.sl);
 284                 }
 285         }
 286
 287         /* actually send any queued packets */
 288         while (!skb_queue_empty(&mcast->pkt_queue)) {
 289                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 290
 291                 skb->dev = dev;
 292
 293                 if (!skb->dst || !skb->dst->neighbour) {
 294                         /* put pseudoheader back on for next time */
 295                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 296                 }
 297
 298                 if (dev_queue_xmit(skb))
 299                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 300         }
 301
 302         return 0;
 303 }
 304
 305 static void
 306 ipoib_mcast_sendonly_join_complete(int status,
 307                                    struct ib_sa_mcmember_rec *mcmember,
 308                                    void *mcast_ptr)
 309 {
 310         struct ipoib_mcast *mcast = mcast_ptr;
 311         struct net_device *dev = mcast->dev;
 312
 313         if (!status)
 314                 ipoib_mcast_join_finish(mcast, mcmember);
 315         else {
 316                 if (mcast->logcount++ < 20)
 317                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 318                                         IPOIB_GID_FMT ", status %d\n",
 319                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 320
 321                 /* Flush out any queued packets */
 322                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 323                         struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 324
 325                         skb->dev = dev;
 326
 327                         dev_kfree_skb_any(skb);
 328                 }
 329
 330                 /* Clear the busy flag so we try again */
 331                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 332         }
 333
 334         complete(&mcast->done);
 335 }
 336
 337 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 338 {
 339         struct net_device *dev = mcast->dev;
 340         struct ipoib_dev_priv *priv = netdev_priv(dev);
 341         struct ib_sa_mcmember_rec rec = {
 342 #if 0                           /* Some SMs don't support send-only yet */
 343                 .join_state = 4
 344 #else
 345                 .join_state = 1
 346 #endif
 347         };
 348         int ret = 0;
 349
 350         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 351                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 352                 return -ENODEV;
 353         }
 354
 355         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 356                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 357                 return -EBUSY;
 358         }
 359
 360         rec.mgid     = mcast->mcmember.mgid;
 361         rec.port_gid = priv->local_gid;
 362         rec.pkey     = cpu_to_be16(priv->pkey);
 363
 364         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec,
 365                                      IB_SA_MCMEMBER_REC_MGID            |
 366                                      IB_SA_MCMEMBER_REC_PORT_GID        |
 367                                      IB_SA_MCMEMBER_REC_PKEY            |
 368                                      IB_SA_MCMEMBER_REC_JOIN_STATE,
 369                                      1000, GFP_ATOMIC,
 370                                      ipoib_mcast_sendonly_join_complete,
 371                                      mcast, &mcast->query);
 372         if (ret < 0) {
 373                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed (ret = %d)\n",
 374                            ret);
 375         } else {
 376                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 377                                 ", starting join\n",
 378                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 379
 380                 mcast->query_id = ret;
 381         }
 382
 383         return ret;
 384 }
 385
 386 static void ipoib_mcast_join_complete(int status,
 387                                       struct ib_sa_mcmember_rec *mcmember,
 388                                       void *mcast_ptr)
 389 {
 390         struct ipoib_mcast *mcast = mcast_ptr;
 391         struct net_device *dev = mcast->dev;
 392         struct ipoib_dev_priv *priv = netdev_priv(dev);
 393
 394         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 395                         " (status %d)\n",
 396                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 397
 398         if (!status && !ipoib_mcast_join_finish(mcast, mcmember)) {
 399                 mcast->backoff = HZ;
 400                 down(&mcast_mutex);
 401                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 402                         queue_work(ipoib_workqueue, &priv->mcast_task);
 403                 up(&mcast_mutex);
 404                 complete(&mcast->done);
 405                 return;
 406         }
 407
 408         if (status == -EINTR) {
 409                 complete(&mcast->done);
 410                 return;
 411         }
 412
 413         if (status && mcast->logcount++ < 20) {
 414                 if (status == -ETIMEDOUT || status == -EINTR) {
 415                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 416                                         ", status %d\n",
 417                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 418                                         status);
 419                 } else {
 420                         ipoib_warn(priv, "multicast join failed for "
 421                                    IPOIB_GID_FMT ", status %d\n",
 422                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 423                                    status);
 424                 }
 425         }
 426
 427         mcast->backoff *= 2;
 428         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 429                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 430
 431         mcast->query = NULL;
 432
 433         down(&mcast_mutex);
 434         if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
 435                 if (status == -ETIMEDOUT)
 436                         queue_work(ipoib_workqueue, &priv->mcast_task);
 437                 else
 438                         queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 439                                            mcast->backoff * HZ);
 440         } else
 441                 complete(&mcast->done);
 442         up(&mcast_mutex);
 443
 444         return;
 445 }
 446
 447 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 448                              int create)
 449 {
 450         struct ipoib_dev_priv *priv = netdev_priv(dev);
 451         struct ib_sa_mcmember_rec rec = {
 452                 .join_state = 1
 453         };
 454         ib_sa_comp_mask comp_mask;
 455         int ret = 0;
 456
 457         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 458                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 459
 460         rec.mgid     = mcast->mcmember.mgid;
 461         rec.port_gid = priv->local_gid;
 462         rec.pkey     = cpu_to_be16(priv->pkey);
 463
 464         comp_mask =
 465                 IB_SA_MCMEMBER_REC_MGID         |
 466                 IB_SA_MCMEMBER_REC_PORT_GID     |
 467                 IB_SA_MCMEMBER_REC_PKEY         |
 468                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 469
 470         if (create) {
 471                 comp_mask |=
 472                         IB_SA_MCMEMBER_REC_QKEY         |
 473                         IB_SA_MCMEMBER_REC_SL           |
 474                         IB_SA_MCMEMBER_REC_FLOW_LABEL   |
 475                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
 476
 477                 rec.qkey          = priv->broadcast->mcmember.qkey;
 478                 rec.sl            = priv->broadcast->mcmember.sl;
 479                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 480                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 481         }
 482
 483         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec, comp_mask,
 484                                      mcast->backoff * 1000, GFP_ATOMIC,
 485                                      ipoib_mcast_join_complete,
 486                                      mcast, &mcast->query);
 487
 488         if (ret < 0) {
 489                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
 490
 491                 mcast->backoff *= 2;
 492                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 493                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 494
 495                 down(&mcast_mutex);
 496                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 497                         queue_delayed_work(ipoib_workqueue,
 498                                            &priv->mcast_task,
 499                                            mcast->backoff);
 500                 up(&mcast_mutex);
 501         } else
 502                 mcast->query_id = ret;
 503 }
 504
 505 void ipoib_mcast_join_task(void *dev_ptr)
 506 {
 507         struct net_device *dev = dev_ptr;
 508         struct ipoib_dev_priv *priv = netdev_priv(dev);
 509
 510         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 511                 return;
 512
 513         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 514                 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
 515         else
 516                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 517
 518         {
 519                 struct ib_port_attr attr;
 520
 521                 if (!ib_query_port(priv->ca, priv->port, &attr)) {
 522                         priv->local_lid  = attr.lid;
 523                         priv->local_rate = attr.active_speed *
 524                                 ib_width_enum_to_int(attr.active_width);
 525                 } else
 526                         ipoib_warn(priv, "ib_query_port failed\n");
 527         }
 528
 529         if (!priv->broadcast) {
 530                 priv->broadcast = ipoib_mcast_alloc(dev, 1);
 531                 if (!priv->broadcast) {
 532                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 533                         down(&mcast_mutex);
 534                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 535                                 queue_delayed_work(ipoib_workqueue,
 536                                                    &priv->mcast_task, HZ);
 537                         up(&mcast_mutex);
 538                         return;
 539                 }
 540
 541                 memcpy(priv->broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 542                        sizeof (union ib_gid));
 543
 544                 spin_lock_irq(&priv->lock);
 545                 __ipoib_mcast_add(dev, priv->broadcast);
 546                 spin_unlock_irq(&priv->lock);
 547         }
 548
 549         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &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 = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
 578                 IPOIB_ENCAP_LEN;
 579         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 580
 581         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 582
 583         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 584         netif_carrier_on(dev);
 585 }
 586
 587 int ipoib_mcast_start_thread(struct net_device *dev)
 588 {
 589         struct ipoib_dev_priv *priv = netdev_priv(dev);
 590
 591         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 592
 593         down(&mcast_mutex);
 594         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 595                 queue_work(ipoib_workqueue, &priv->mcast_task);
 596         up(&mcast_mutex);
 597
 598         return 0;
 599 }
 600
 601 int ipoib_mcast_stop_thread(struct net_device *dev)
 602 {
 603         struct ipoib_dev_priv *priv = netdev_priv(dev);
 604         struct ipoib_mcast *mcast;
 605
 606         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 607
 608         down(&mcast_mutex);
 609         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 610         cancel_delayed_work(&priv->mcast_task);
 611         up(&mcast_mutex);
 612
 613         flush_workqueue(ipoib_workqueue);
 614
 615         if (priv->broadcast && priv->broadcast->query) {
 616                 ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
 617                 priv->broadcast->query = NULL;
 618                 ipoib_dbg_mcast(priv, "waiting for bcast\n");
 619                 wait_for_completion(&priv->broadcast->done);
 620         }
 621
 622         list_for_each_entry(mcast, &priv->multicast_list, list) {
 623                 if (mcast->query) {
 624                         ib_sa_cancel_query(mcast->query_id, mcast->query);
 625                         mcast->query = NULL;
 626                         ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
 627                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 628                         wait_for_completion(&mcast->done);
 629                 }
 630         }
 631
 632         return 0;
 633 }
 634
 635 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 636 {
 637         struct ipoib_dev_priv *priv = netdev_priv(dev);
 638         struct ib_sa_mcmember_rec rec = {
 639                 .join_state = 1
 640         };
 641         int ret = 0;
 642
 643         if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
 644                 return 0;
 645
 646         ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 647                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 648
 649         rec.mgid     = mcast->mcmember.mgid;
 650         rec.port_gid = priv->local_gid;
 651         rec.pkey     = cpu_to_be16(priv->pkey);
 652
 653         /* Remove ourselves from the multicast group */
 654         ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
 655                                  &mcast->mcmember.mgid);
 656         if (ret)
 657                 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
 658
 659         /*
 660          * Just make one shot at leaving and don't wait for a reply;
 661          * if we fail, too bad.
 662          */
 663         ret = ib_sa_mcmember_rec_delete(priv->ca, priv->port, &rec,
 664                                         IB_SA_MCMEMBER_REC_MGID         |
 665                                         IB_SA_MCMEMBER_REC_PORT_GID     |
 666                                         IB_SA_MCMEMBER_REC_PKEY         |
 667                                         IB_SA_MCMEMBER_REC_JOIN_STATE,
 668                                         0, GFP_ATOMIC, NULL,
 669                                         mcast, &mcast->query);
 670         if (ret < 0)
 671                 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
 672                            "for leave (result = %d)\n", ret);
 673
 674         return 0;
 675 }
 676
 677 void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
 678                       struct sk_buff *skb)
 679 {
 680         struct ipoib_dev_priv *priv = netdev_priv(dev);
 681         struct ipoib_mcast *mcast;
 682
 683         /*
 684          * We can only be called from ipoib_start_xmit, so we're
 685          * inside tx_lock -- no need to save/restore flags.
 686          */
 687         spin_lock(&priv->lock);
 688
 689         mcast = __ipoib_mcast_find(dev, mgid);
 690         if (!mcast) {
 691                 /* Let's create a new send only group now */
 692                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 693                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(*mgid));
 694
 695                 mcast = ipoib_mcast_alloc(dev, 0);
 696                 if (!mcast) {
 697                         ipoib_warn(priv, "unable to allocate memory for "
 698                                    "multicast structure\n");
 699                         dev_kfree_skb_any(skb);
 700                         goto out;
 701                 }
 702
 703                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 704                 mcast->mcmember.mgid = *mgid;
 705                 __ipoib_mcast_add(dev, mcast);
 706                 list_add_tail(&mcast->list, &priv->multicast_list);
 707         }
 708
 709         if (!mcast->ah) {
 710                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 711                         skb_queue_tail(&mcast->pkt_queue, skb);
 712                 else
 713                         dev_kfree_skb_any(skb);
 714
 715                 if (mcast->query)
 716                         ipoib_dbg_mcast(priv, "no address vector, "
 717                                         "but multicast join already started\n");
 718                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 719                         ipoib_mcast_sendonly_join(mcast);
 720
 721                 /*
 722                  * If lookup completes between here and out:, don't
 723                  * want to send packet twice.
 724                  */
 725                 mcast = NULL;
 726         }
 727
 728 out:
 729         if (mcast && mcast->ah) {
 730                 if (skb->dst            &&
 731                     skb->dst->neighbour &&
 732                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 733                         struct ipoib_neigh *neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 734
 735                         if (neigh) {
 736                                 kref_get(&mcast->ah->ref);
 737                                 neigh->ah       = mcast->ah;
 738                                 neigh->neighbour = skb->dst->neighbour;
 739                                 *to_ipoib_neigh(skb->dst->neighbour) = neigh;
 740                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 741                         }
 742                 }
 743
 744                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 745         }
 746
 747         spin_unlock(&priv->lock);
 748 }
 749
 750 void ipoib_mcast_dev_flush(struct net_device *dev)
 751 {
 752         struct ipoib_dev_priv *priv = netdev_priv(dev);
 753         LIST_HEAD(remove_list);
 754         struct ipoib_mcast *mcast, *tmcast, *nmcast;
 755         unsigned long flags;
 756
 757         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 758
 759         spin_lock_irqsave(&priv->lock, flags);
 760         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 761                 nmcast = ipoib_mcast_alloc(dev, 0);
 762                 if (nmcast) {
 763                         nmcast->flags =
 764                                 mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY);
 765
 766                         nmcast->mcmember.mgid = mcast->mcmember.mgid;
 767
 768                         /* Add the new group in before the to-be-destroyed group */
 769                         list_add_tail(&nmcast->list, &mcast->list);
 770                         list_del_init(&mcast->list);
 771
 772                         rb_replace_node(&mcast->rb_node, &nmcast->rb_node,
 773                                         &priv->multicast_tree);
 774
 775                         list_add_tail(&mcast->list, &remove_list);
 776                 } else {
 777                         ipoib_warn(priv, "could not reallocate multicast group "
 778                                    IPOIB_GID_FMT "\n",
 779                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 780                 }
 781         }
 782
 783         if (priv->broadcast) {
 784                 nmcast = ipoib_mcast_alloc(dev, 0);
 785                 if (nmcast) {
 786                         nmcast->mcmember.mgid = priv->broadcast->mcmember.mgid;
 787
 788                         rb_replace_node(&priv->broadcast->rb_node,
 789                                         &nmcast->rb_node,
 790                                         &priv->multicast_tree);
 791
 792                         list_add_tail(&priv->broadcast->list, &remove_list);
 793                 }
 794
 795                 priv->broadcast = nmcast;
 796         }
 797
 798         spin_unlock_irqrestore(&priv->lock, flags);
 799
 800         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 801                 ipoib_mcast_leave(dev, mcast);
 802                 ipoib_mcast_free(mcast);
 803         }
 804 }
 805
 806 void ipoib_mcast_dev_down(struct net_device *dev)
 807 {
 808         struct ipoib_dev_priv *priv = netdev_priv(dev);
 809         unsigned long flags;
 810
 811         /* Delete broadcast since it will be recreated */
 812         if (priv->broadcast) {
 813                 ipoib_dbg_mcast(priv, "deleting broadcast group\n");
 814
 815                 spin_lock_irqsave(&priv->lock, flags);
 816                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 817                 spin_unlock_irqrestore(&priv->lock, flags);
 818                 ipoib_mcast_leave(dev, priv->broadcast);
 819                 ipoib_mcast_free(priv->broadcast);
 820                 priv->broadcast = NULL;
 821         }
 822 }
 823
 824 void ipoib_mcast_restart_task(void *dev_ptr)
 825 {
 826         struct net_device *dev = dev_ptr;
 827         struct ipoib_dev_priv *priv = netdev_priv(dev);
 828         struct dev_mc_list *mclist;
 829         struct ipoib_mcast *mcast, *tmcast;
 830         LIST_HEAD(remove_list);
 831         unsigned long flags;
 832
 833         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 834
 835         ipoib_mcast_stop_thread(dev);
 836
 837         spin_lock_irqsave(&priv->lock, flags);
 838
 839         /*
 840          * Unfortunately, the networking core only gives us a list of all of
 841          * the multicast hardware addresses. We need to figure out which ones
 842          * are new and which ones have been removed
 843          */
 844
 845         /* Clear out the found flag */
 846         list_for_each_entry(mcast, &priv->multicast_list, list)
 847                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 848
 849         /* Mark all of the entries that are found or don't exist */
 850         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 851                 union ib_gid mgid;
 852
 853                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 854
 855                 /* Add in the P_Key */
 856                 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
 857                 mgid.raw[5] = priv->pkey & 0xff;
 858
 859                 mcast = __ipoib_mcast_find(dev, &mgid);
 860                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 861                         struct ipoib_mcast *nmcast;
 862
 863                         /* Not found or send-only group, let's add a new entry */
 864                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 865                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 866
 867                         nmcast = ipoib_mcast_alloc(dev, 0);
 868                         if (!nmcast) {
 869                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 870                                 continue;
 871                         }
 872
 873                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 874
 875                         nmcast->mcmember.mgid = mgid;
 876
 877                         if (mcast) {
 878                                 /* Destroy the send only entry */
 879                                 list_del(&mcast->list);
 880                                 list_add_tail(&mcast->list, &remove_list);
 881
 882                                 rb_replace_node(&mcast->rb_node,
 883                                                 &nmcast->rb_node,
 884                                                 &priv->multicast_tree);
 885                         } else
 886                                 __ipoib_mcast_add(dev, nmcast);
 887
 888                         list_add_tail(&nmcast->list, &priv->multicast_list);
 889                 }
 890
 891                 if (mcast)
 892                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 893         }
 894
 895         /* Remove all of the entries don't exist anymore */
 896         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 897                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 898                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 899                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 900                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 901
 902                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 903
 904                         /* Move to the remove list */
 905                         list_del(&mcast->list);
 906                         list_add_tail(&mcast->list, &remove_list);
 907                 }
 908         }
 909         spin_unlock_irqrestore(&priv->lock, flags);
 910
 911         /* We have to cancel outside of the spinlock */
 912         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 913                 ipoib_mcast_leave(mcast->dev, mcast);
 914                 ipoib_mcast_free(mcast);
 915         }
 916
 917         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 918                 ipoib_mcast_start_thread(dev);
 919 }
 920
 921 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 922 {
 923         struct ipoib_mcast_iter *iter;
 924
 925         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 926         if (!iter)
 927                 return NULL;
 928
 929         iter->dev = dev;
 930         memset(iter->mgid.raw, 0, sizeof iter->mgid);
 931
 932         if (ipoib_mcast_iter_next(iter)) {
 933                 ipoib_mcast_iter_free(iter);
 934                 return NULL;
 935         }
 936
 937         return iter;
 938 }
 939
 940 void ipoib_mcast_iter_free(struct ipoib_mcast_iter *iter)
 941 {
 942         kfree(iter);
 943 }
 944
 945 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 946 {
 947         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 948         struct rb_node *n;
 949         struct ipoib_mcast *mcast;
 950         int ret = 1;
 951
 952         spin_lock_irq(&priv->lock);
 953
 954         n = rb_first(&priv->multicast_tree);
 955
 956         while (n) {
 957                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 958
 959                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 960                            sizeof (union ib_gid)) < 0) {
 961                         iter->mgid      = mcast->mcmember.mgid;
 962                         iter->created   = mcast->created;
 963                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 964                         iter->complete  = !!mcast->ah;
 965                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 966
 967                         ret = 0;
 968
 969                         break;
 970                 }
 971
 972                 n = rb_next(n);
 973         }
 974
 975         spin_unlock_irq(&priv->lock);
 976
 977         return ret;
 978 }
 979
 980 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 981                            union ib_gid *mgid,
 982                            unsigned long *created,
 983                            unsigned int *queuelen,
 984                            unsigned int *complete,
 985                            unsigned int *send_only)
 986 {
 987         *mgid      = iter->mgid;
 988         *created   = iter->created;
 989         *queuelen  = iter->queuelen;
 990         *complete  = iter->complete;
 991         *send_only = iter->send_only;
 992 }