git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/ulp/ipoib/ipoib_multicast.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id: ipoib_multicast.c 1362 2004-12-18 15:56:29Z roland $
  33  */
  34
  35 #include <linux/skbuff.h>
  36 #include <linux/rtnetlink.h>
  37 #include <linux/ip.h>
  38 #include <linux/in.h>
  39 #include <linux/igmp.h>
  40 #include <linux/inetdevice.h>
  41 #include <linux/delay.h>
  42 #include <linux/completion.h>
  43
  44 #include "ipoib.h"
  45
  46 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  47 static int mcast_debug_level;
  48
  49 module_param(mcast_debug_level, int, 0644);
  50 MODULE_PARM_DESC(mcast_debug_level,
  51                  "Enable multicast debug tracing if > 0");
  52 #endif
  53
  54 static DECLARE_MUTEX(mcast_mutex);
  55
  56 /* Used for all multicast joins (broadcast, IPv4 mcast and IPv6 mcast) */
  57 struct ipoib_mcast {
  58         struct ib_sa_mcmember_rec mcmember;
  59         struct ipoib_ah          *ah;
  60
  61         struct rb_node    rb_node;
  62         struct list_head  list;
  63         struct completion done;
  64
  65         int                 query_id;
  66         struct ib_sa_query *query;
  67
  68         unsigned long created;
  69         unsigned long backoff;
  70
  71         unsigned long flags;
  72         unsigned char logcount;
  73
  74         struct list_head  neigh_list;
  75
  76         struct sk_buff_head pkt_queue;
  77
  78         struct net_device *dev;
  79 };
  80
  81 struct ipoib_mcast_iter {
  82         struct net_device *dev;
  83         union ib_gid       mgid;
  84         unsigned long      created;
  85         unsigned int       queuelen;
  86         unsigned int       complete;
  87         unsigned int       send_only;
  88 };
  89
  90 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  91 {
  92         struct net_device *dev = mcast->dev;
  93         struct ipoib_dev_priv *priv = netdev_priv(dev);
  94         struct ipoib_neigh *neigh, *tmp;
  95         unsigned long flags;
  96         LIST_HEAD(ah_list);
  97         struct ipoib_ah *ah, *tah;
  98
  99         ipoib_dbg_mcast(netdev_priv(dev),
 100                         "deleting multicast group " IPOIB_GID_FMT "\n",
 101                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 102
 103         spin_lock_irqsave(&priv->lock, flags);
 104
 105         list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
 106                 if (neigh->ah)
 107                         list_add_tail(&neigh->ah->list, &ah_list);
 108                 *to_ipoib_neigh(neigh->neighbour) = NULL;
 109                 neigh->neighbour->ops->destructor = NULL;
 110                 kfree(neigh);
 111         }
 112
 113         spin_unlock_irqrestore(&priv->lock, flags);
 114
 115         list_for_each_entry_safe(ah, tah, &ah_list, list)
 116                 ipoib_put_ah(ah);
 117
 118         if (mcast->ah)
 119                 ipoib_put_ah(mcast->ah);
 120
 121         while (!skb_queue_empty(&mcast->pkt_queue)) {
 122                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 123
 124                 skb->dev = dev;
 125                 dev_kfree_skb_any(skb);
 126         }
 127
 128         kfree(mcast);
 129 }
 130
 131 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 132                                              int can_sleep)
 133 {
 134         struct ipoib_mcast *mcast;
 135
 136         mcast = kmalloc(sizeof (*mcast), can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 137         if (!mcast)
 138                 return NULL;
 139
 140         memset(mcast, 0, sizeof (*mcast));
 141
 142         init_completion(&mcast->done);
 143
 144         mcast->dev = dev;
 145         mcast->created = jiffies;
 146         mcast->backoff = HZ;
 147         mcast->logcount = 0;
 148
 149         INIT_LIST_HEAD(&mcast->list);
 150         INIT_LIST_HEAD(&mcast->neigh_list);
 151         skb_queue_head_init(&mcast->pkt_queue);
 152
 153         mcast->ah    = NULL;
 154         mcast->query = NULL;
 155
 156         return mcast;
 157 }
 158
 159 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, union ib_gid *mgid)
 160 {
 161         struct ipoib_dev_priv *priv = netdev_priv(dev);
 162         struct rb_node *n = priv->multicast_tree.rb_node;
 163
 164         while (n) {
 165                 struct ipoib_mcast *mcast;
 166                 int ret;
 167
 168                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 169
 170                 ret = memcmp(mgid->raw, mcast->mcmember.mgid.raw,
 171                              sizeof (union ib_gid));
 172                 if (ret < 0)
 173                         n = n->rb_left;
 174                 else if (ret > 0)
 175                         n = n->rb_right;
 176                 else
 177                         return mcast;
 178         }
 179
 180         return NULL;
 181 }
 182
 183 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 184 {
 185         struct ipoib_dev_priv *priv = netdev_priv(dev);
 186         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 187
 188         while (*n) {
 189                 struct ipoib_mcast *tmcast;
 190                 int ret;
 191
 192                 pn = *n;
 193                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 194
 195                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 196                              sizeof (union ib_gid));
 197                 if (ret < 0)
 198                         n = &pn->rb_left;
 199                 else if (ret > 0)
 200                         n = &pn->rb_right;
 201                 else
 202                         return -EEXIST;
 203         }
 204
 205         rb_link_node(&mcast->rb_node, pn, n);
 206         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 207
 208         return 0;
 209 }
 210
 211 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 212                                    struct ib_sa_mcmember_rec *mcmember)
 213 {
 214         struct net_device *dev = mcast->dev;
 215         struct ipoib_dev_priv *priv = netdev_priv(dev);
 216         int ret;
 217
 218         mcast->mcmember = *mcmember;
 219
 220         /* Set the cached Q_Key before we attach if it's the broadcast group */
 221         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 222                     sizeof (union ib_gid))) {
 223                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 224                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 225         }
 226
 227         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 228                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 229                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 230                                    " already attached\n",
 231                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 232
 233                         return 0;
 234                 }
 235
 236                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 237                                          &mcast->mcmember.mgid);
 238                 if (ret < 0) {
 239                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 240                                    IPOIB_GID_FMT "\n",
 241                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 242
 243                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 244                         return ret;
 245                 }
 246         }
 247
 248         {
 249                 struct ib_ah_attr av = {
 250                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 251                         .port_num      = priv->port,
 252                         .sl            = mcast->mcmember.sl,
 253                         .ah_flags      = IB_AH_GRH,
 254                         .grh           = {
 255                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 256                                 .hop_limit     = mcast->mcmember.hop_limit,
 257                                 .sgid_index    = 0,
 258                                 .traffic_class = mcast->mcmember.traffic_class
 259                         }
 260                 };
 261
 262                 av.grh.dgid = mcast->mcmember.mgid;
 263
 264                 if (ib_sa_rate_enum_to_int(mcast->mcmember.rate) > 0)
 265                         av.static_rate = (2 * priv->local_rate -
 266                                           ib_sa_rate_enum_to_int(mcast->mcmember.rate) - 1) /
 267                                 (priv->local_rate ? priv->local_rate : 1);
 268
 269                 ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n",
 270                                 av.static_rate, priv->local_rate,
 271                                 ib_sa_rate_enum_to_int(mcast->mcmember.rate));
 272
 273                 mcast->ah = ipoib_create_ah(dev, priv->pd, &av);
 274                 if (!mcast->ah) {
 275                         ipoib_warn(priv, "ib_address_create failed\n");
 276                 } else {
 277                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 278                                         " AV %p, LID 0x%04x, SL %d\n",
 279                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 280                                         mcast->ah->ah,
 281                                         be16_to_cpu(mcast->mcmember.mlid),
 282                                         mcast->mcmember.sl);
 283                 }
 284         }
 285
 286         /* actually send any queued packets */
 287         while (!skb_queue_empty(&mcast->pkt_queue)) {
 288                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 289
 290                 skb->dev = dev;
 291
 292                 if (!skb->dst || !skb->dst->neighbour) {
 293                         /* put pseudoheader back on for next time */
 294                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 295                 }
 296
 297                 if (dev_queue_xmit(skb))
 298                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 299         }
 300
 301         return 0;
 302 }
 303
 304 static void
 305 ipoib_mcast_sendonly_join_complete(int status,
 306                                    struct ib_sa_mcmember_rec *mcmember,
 307                                    void *mcast_ptr)
 308 {
 309         struct ipoib_mcast *mcast = mcast_ptr;
 310         struct net_device *dev = mcast->dev;
 311
 312         if (!status)
 313                 ipoib_mcast_join_finish(mcast, mcmember);
 314         else {
 315                 if (mcast->logcount++ < 20)
 316                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 317                                         IPOIB_GID_FMT ", status %d\n",
 318                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 319
 320                 /* Flush out any queued packets */
 321                 while (!skb_queue_empty(&mcast->pkt_queue)) {
 322                         struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 323
 324                         skb->dev = dev;
 325
 326                         dev_kfree_skb_any(skb);
 327                 }
 328
 329                 /* Clear the busy flag so we try again */
 330                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 331         }
 332
 333         complete(&mcast->done);
 334 }
 335
 336 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 337 {
 338         struct net_device *dev = mcast->dev;
 339         struct ipoib_dev_priv *priv = netdev_priv(dev);
 340         struct ib_sa_mcmember_rec rec = {
 341 #if 0                           /* Some SMs don't support send-only yet */
 342                 .join_state = 4
 343 #else
 344                 .join_state = 1
 345 #endif
 346         };
 347         int ret = 0;
 348
 349         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 350                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 351                 return -ENODEV;
 352         }
 353
 354         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 355                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 356                 return -EBUSY;
 357         }
 358
 359         rec.mgid     = mcast->mcmember.mgid;
 360         rec.port_gid = priv->local_gid;
 361         rec.pkey     = be16_to_cpu(priv->pkey);
 362
 363         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec,
 364                                      IB_SA_MCMEMBER_REC_MGID            |
 365                                      IB_SA_MCMEMBER_REC_PORT_GID        |
 366                                      IB_SA_MCMEMBER_REC_PKEY            |
 367                                      IB_SA_MCMEMBER_REC_JOIN_STATE,
 368                                      1000, GFP_ATOMIC,
 369                                      ipoib_mcast_sendonly_join_complete,
 370                                      mcast, &mcast->query);
 371         if (ret < 0) {
 372                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed (ret = %d)\n",
 373                            ret);
 374         } else {
 375                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 376                                 ", starting join\n",
 377                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 378
 379                 mcast->query_id = ret;
 380         }
 381
 382         return ret;
 383 }
 384
 385 static void ipoib_mcast_join_complete(int status,
 386                                       struct ib_sa_mcmember_rec *mcmember,
 387                                       void *mcast_ptr)
 388 {
 389         struct ipoib_mcast *mcast = mcast_ptr;
 390         struct net_device *dev = mcast->dev;
 391         struct ipoib_dev_priv *priv = netdev_priv(dev);
 392
 393         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 394                         " (status %d)\n",
 395                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 396
 397         if (!status && !ipoib_mcast_join_finish(mcast, mcmember)) {
 398                 mcast->backoff = HZ;
 399                 down(&mcast_mutex);
 400                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 401                         queue_work(ipoib_workqueue, &priv->mcast_task);
 402                 up(&mcast_mutex);
 403                 complete(&mcast->done);
 404                 return;
 405         }
 406
 407         if (status == -EINTR) {
 408                 complete(&mcast->done);
 409                 return;
 410         }
 411
 412         if (status && mcast->logcount++ < 20) {
 413                 if (status == -ETIMEDOUT || status == -EINTR) {
 414                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 415                                         ", status %d\n",
 416                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 417                                         status);
 418                 } else {
 419                         ipoib_warn(priv, "multicast join failed for "
 420                                    IPOIB_GID_FMT ", status %d\n",
 421                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 422                                    status);
 423                 }
 424         }
 425
 426         mcast->backoff *= 2;
 427         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 428                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 429
 430         mcast->query = NULL;
 431
 432         down(&mcast_mutex);
 433         if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
 434                 if (status == -ETIMEDOUT)
 435                         queue_work(ipoib_workqueue, &priv->mcast_task);
 436                 else
 437                         queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 438                                            mcast->backoff * HZ);
 439         } else
 440                 complete(&mcast->done);
 441         up(&mcast_mutex);
 442
 443         return;
 444 }
 445
 446 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 447                              int create)
 448 {
 449         struct ipoib_dev_priv *priv = netdev_priv(dev);
 450         struct ib_sa_mcmember_rec rec = {
 451                 .join_state = 1
 452         };
 453         ib_sa_comp_mask comp_mask;
 454         int ret = 0;
 455
 456         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 457                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 458
 459         rec.mgid     = mcast->mcmember.mgid;
 460         rec.port_gid = priv->local_gid;
 461         rec.pkey     = be16_to_cpu(priv->pkey);
 462
 463         comp_mask =
 464                 IB_SA_MCMEMBER_REC_MGID         |
 465                 IB_SA_MCMEMBER_REC_PORT_GID     |
 466                 IB_SA_MCMEMBER_REC_PKEY         |
 467                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 468
 469         if (create) {
 470                 comp_mask |=
 471                         IB_SA_MCMEMBER_REC_QKEY         |
 472                         IB_SA_MCMEMBER_REC_SL           |
 473                         IB_SA_MCMEMBER_REC_FLOW_LABEL   |
 474                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
 475
 476                 rec.qkey          = priv->broadcast->mcmember.qkey;
 477                 rec.sl            = priv->broadcast->mcmember.sl;
 478                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 479                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 480         }
 481
 482         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec, comp_mask,
 483                                      mcast->backoff * 1000, GFP_ATOMIC,
 484                                      ipoib_mcast_join_complete,
 485                                      mcast, &mcast->query);
 486
 487         if (ret < 0) {
 488                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
 489
 490                 mcast->backoff *= 2;
 491                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 492                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 493
 494                 down(&mcast_mutex);
 495                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 496                         queue_delayed_work(ipoib_workqueue,
 497                                            &priv->mcast_task,
 498                                            mcast->backoff);
 499                 up(&mcast_mutex);
 500         } else
 501                 mcast->query_id = ret;
 502 }
 503
 504 void ipoib_mcast_join_task(void *dev_ptr)
 505 {
 506         struct net_device *dev = dev_ptr;
 507         struct ipoib_dev_priv *priv = netdev_priv(dev);
 508
 509         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 510                 return;
 511
 512         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 513                 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
 514         else
 515                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 516
 517         {
 518                 struct ib_port_attr attr;
 519
 520                 if (!ib_query_port(priv->ca, priv->port, &attr)) {
 521                         priv->local_lid  = attr.lid;
 522                         priv->local_rate = attr.active_speed *
 523                                 ib_width_enum_to_int(attr.active_width);
 524                 } else
 525                         ipoib_warn(priv, "ib_query_port failed\n");
 526         }
 527
 528         if (!priv->broadcast) {
 529                 priv->broadcast = ipoib_mcast_alloc(dev, 1);
 530                 if (!priv->broadcast) {
 531                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 532                         down(&mcast_mutex);
 533                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 534                                 queue_delayed_work(ipoib_workqueue,
 535                                                    &priv->mcast_task, HZ);
 536                         up(&mcast_mutex);
 537                         return;
 538                 }
 539
 540                 memcpy(priv->broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 541                        sizeof (union ib_gid));
 542
 543                 spin_lock_irq(&priv->lock);
 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                 ipoib_mcast_join(dev, priv->broadcast, 0);
 550                 return;
 551         }
 552
 553         while (1) {
 554                 struct ipoib_mcast *mcast = NULL;
 555
 556                 spin_lock_irq(&priv->lock);
 557                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 558                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 559                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 560                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 561                                 /* Found the next unjoined group */
 562                                 break;
 563                         }
 564                 }
 565                 spin_unlock_irq(&priv->lock);
 566
 567                 if (&mcast->list == &priv->multicast_list) {
 568                         /* All done */
 569                         break;
 570                 }
 571
 572                 ipoib_mcast_join(dev, mcast, 1);
 573                 return;
 574         }
 575
 576         priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
 577                 IPOIB_ENCAP_LEN;
 578         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 579
 580         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 581
 582         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 583         netif_carrier_on(dev);
 584 }
 585
 586 int ipoib_mcast_start_thread(struct net_device *dev)
 587 {
 588         struct ipoib_dev_priv *priv = netdev_priv(dev);
 589
 590         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 591
 592         down(&mcast_mutex);
 593         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 594                 queue_work(ipoib_workqueue, &priv->mcast_task);
 595         up(&mcast_mutex);
 596
 597         return 0;
 598 }
 599
 600 int ipoib_mcast_stop_thread(struct net_device *dev)
 601 {
 602         struct ipoib_dev_priv *priv = netdev_priv(dev);
 603         struct ipoib_mcast *mcast;
 604
 605         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 606
 607         down(&mcast_mutex);
 608         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 609         cancel_delayed_work(&priv->mcast_task);
 610         up(&mcast_mutex);
 611
 612         flush_workqueue(ipoib_workqueue);
 613
 614         if (priv->broadcast && priv->broadcast->query) {
 615                 ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
 616                 priv->broadcast->query = NULL;
 617                 ipoib_dbg_mcast(priv, "waiting for bcast\n");
 618                 wait_for_completion(&priv->broadcast->done);
 619         }
 620
 621         list_for_each_entry(mcast, &priv->multicast_list, list) {
 622                 if (mcast->query) {
 623                         ib_sa_cancel_query(mcast->query_id, mcast->query);
 624                         mcast->query = NULL;
 625                         ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
 626                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 627                         wait_for_completion(&mcast->done);
 628                 }
 629         }
 630
 631         return 0;
 632 }
 633
 634 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 635 {
 636         struct ipoib_dev_priv *priv = netdev_priv(dev);
 637         struct ib_sa_mcmember_rec rec = {
 638                 .join_state = 1
 639         };
 640         int ret = 0;
 641
 642         if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
 643                 return 0;
 644
 645         ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 646                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 647
 648         rec.mgid     = mcast->mcmember.mgid;
 649         rec.port_gid = priv->local_gid;
 650         rec.pkey     = be16_to_cpu(priv->pkey);
 651
 652         /* Remove ourselves from the multicast group */
 653         ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
 654                                  &mcast->mcmember.mgid);
 655         if (ret)
 656                 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
 657
 658         /*
 659          * Just make one shot at leaving and don't wait for a reply;
 660          * if we fail, too bad.
 661          */
 662         ret = ib_sa_mcmember_rec_delete(priv->ca, priv->port, &rec,
 663                                         IB_SA_MCMEMBER_REC_MGID         |
 664                                         IB_SA_MCMEMBER_REC_PORT_GID     |
 665                                         IB_SA_MCMEMBER_REC_PKEY         |
 666                                         IB_SA_MCMEMBER_REC_JOIN_STATE,
 667                                         0, GFP_ATOMIC, NULL,
 668                                         mcast, &mcast->query);
 669         if (ret < 0)
 670                 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
 671                            "for leave (result = %d)\n", ret);
 672
 673         return 0;
 674 }
 675
 676 void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
 677                       struct sk_buff *skb)
 678 {
 679         struct ipoib_dev_priv *priv = netdev_priv(dev);
 680         struct ipoib_mcast *mcast;
 681
 682         /*
 683          * We can only be called from ipoib_start_xmit, so we're
 684          * inside tx_lock -- no need to save/restore flags.
 685          */
 686         spin_lock(&priv->lock);
 687
 688         mcast = __ipoib_mcast_find(dev, mgid);
 689         if (!mcast) {
 690                 /* Let's create a new send only group now */
 691                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 692                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(*mgid));
 693
 694                 mcast = ipoib_mcast_alloc(dev, 0);
 695                 if (!mcast) {
 696                         ipoib_warn(priv, "unable to allocate memory for "
 697                                    "multicast structure\n");
 698                         dev_kfree_skb_any(skb);
 699                         goto out;
 700                 }
 701
 702                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 703                 mcast->mcmember.mgid = *mgid;
 704                 __ipoib_mcast_add(dev, mcast);
 705                 list_add_tail(&mcast->list, &priv->multicast_list);
 706         }
 707
 708         if (!mcast->ah) {
 709                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 710                         skb_queue_tail(&mcast->pkt_queue, skb);
 711                 else
 712                         dev_kfree_skb_any(skb);
 713
 714                 if (mcast->query)
 715                         ipoib_dbg_mcast(priv, "no address vector, "
 716                                         "but multicast join already started\n");
 717                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 718                         ipoib_mcast_sendonly_join(mcast);
 719
 720                 /*
 721                  * If lookup completes between here and out:, don't
 722                  * want to send packet twice.
 723                  */
 724                 mcast = NULL;
 725         }
 726
 727 out:
 728         if (mcast && mcast->ah) {
 729                 if (skb->dst            &&
 730                     skb->dst->neighbour &&
 731                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 732                         struct ipoib_neigh *neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 733
 734                         if (neigh) {
 735                                 kref_get(&mcast->ah->ref);
 736                                 neigh->ah       = mcast->ah;
 737                                 neigh->neighbour = skb->dst->neighbour;
 738                                 *to_ipoib_neigh(skb->dst->neighbour) = neigh;
 739                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 740                         }
 741                 }
 742
 743                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 744         }
 745
 746         spin_unlock(&priv->lock);
 747 }
 748
 749 void ipoib_mcast_dev_flush(struct net_device *dev)
 750 {
 751         struct ipoib_dev_priv *priv = netdev_priv(dev);
 752         LIST_HEAD(remove_list);
 753         struct ipoib_mcast *mcast, *tmcast, *nmcast;
 754         unsigned long flags;
 755
 756         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 757
 758         spin_lock_irqsave(&priv->lock, flags);
 759         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 760                 nmcast = ipoib_mcast_alloc(dev, 0);
 761                 if (nmcast) {
 762                         nmcast->flags =
 763                                 mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY);
 764
 765                         nmcast->mcmember.mgid = mcast->mcmember.mgid;
 766
 767                         /* Add the new group in before the to-be-destroyed group */
 768                         list_add_tail(&nmcast->list, &mcast->list);
 769                         list_del_init(&mcast->list);
 770
 771                         rb_replace_node(&mcast->rb_node, &nmcast->rb_node,
 772                                         &priv->multicast_tree);
 773
 774                         list_add_tail(&mcast->list, &remove_list);
 775                 } else {
 776                         ipoib_warn(priv, "could not reallocate multicast group "
 777                                    IPOIB_GID_FMT "\n",
 778                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 779                 }
 780         }
 781
 782         if (priv->broadcast) {
 783                 nmcast = ipoib_mcast_alloc(dev, 0);
 784                 if (nmcast) {
 785                         nmcast->mcmember.mgid = priv->broadcast->mcmember.mgid;
 786
 787                         rb_replace_node(&priv->broadcast->rb_node,
 788                                         &nmcast->rb_node,
 789                                         &priv->multicast_tree);
 790
 791                         list_add_tail(&priv->broadcast->list, &remove_list);
 792                 }
 793
 794                 priv->broadcast = nmcast;
 795         }
 796
 797         spin_unlock_irqrestore(&priv->lock, flags);
 798
 799         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 800                 ipoib_mcast_leave(dev, mcast);
 801                 ipoib_mcast_free(mcast);
 802         }
 803 }
 804
 805 void ipoib_mcast_dev_down(struct net_device *dev)
 806 {
 807         struct ipoib_dev_priv *priv = netdev_priv(dev);
 808         unsigned long flags;
 809
 810         /* Delete broadcast since it will be recreated */
 811         if (priv->broadcast) {
 812                 ipoib_dbg_mcast(priv, "deleting broadcast group\n");
 813
 814                 spin_lock_irqsave(&priv->lock, flags);
 815                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 816                 spin_unlock_irqrestore(&priv->lock, flags);
 817                 ipoib_mcast_leave(dev, priv->broadcast);
 818                 ipoib_mcast_free(priv->broadcast);
 819                 priv->broadcast = NULL;
 820         }
 821 }
 822
 823 void ipoib_mcast_restart_task(void *dev_ptr)
 824 {
 825         struct net_device *dev = dev_ptr;
 826         struct ipoib_dev_priv *priv = netdev_priv(dev);
 827         struct dev_mc_list *mclist;
 828         struct ipoib_mcast *mcast, *tmcast;
 829         LIST_HEAD(remove_list);
 830         unsigned long flags;
 831
 832         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 833
 834         ipoib_mcast_stop_thread(dev);
 835
 836         spin_lock_irqsave(&priv->lock, flags);
 837
 838         /*
 839          * Unfortunately, the networking core only gives us a list of all of
 840          * the multicast hardware addresses. We need to figure out which ones
 841          * are new and which ones have been removed
 842          */
 843
 844         /* Clear out the found flag */
 845         list_for_each_entry(mcast, &priv->multicast_list, list)
 846                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 847
 848         /* Mark all of the entries that are found or don't exist */
 849         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 850                 union ib_gid mgid;
 851
 852                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 853
 854                 /* Add in the P_Key */
 855                 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
 856                 mgid.raw[5] = priv->pkey & 0xff;
 857
 858                 mcast = __ipoib_mcast_find(dev, &mgid);
 859                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 860                         struct ipoib_mcast *nmcast;
 861
 862                         /* Not found or send-only group, let's add a new entry */
 863                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 864                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 865
 866                         nmcast = ipoib_mcast_alloc(dev, 0);
 867                         if (!nmcast) {
 868                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 869                                 continue;
 870                         }
 871
 872                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 873
 874                         nmcast->mcmember.mgid = mgid;
 875
 876                         if (mcast) {
 877                                 /* Destroy the send only entry */
 878                                 list_del(&mcast->list);
 879                                 list_add_tail(&mcast->list, &remove_list);
 880
 881                                 rb_replace_node(&mcast->rb_node,
 882                                                 &nmcast->rb_node,
 883                                                 &priv->multicast_tree);
 884                         } else
 885                                 __ipoib_mcast_add(dev, nmcast);
 886
 887                         list_add_tail(&nmcast->list, &priv->multicast_list);
 888                 }
 889
 890                 if (mcast)
 891                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 892         }
 893
 894         /* Remove all of the entries don't exist anymore */
 895         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 896                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 897                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 898                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 899                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 900
 901                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 902
 903                         /* Move to the remove list */
 904                         list_del(&mcast->list);
 905                         list_add_tail(&mcast->list, &remove_list);
 906                 }
 907         }
 908         spin_unlock_irqrestore(&priv->lock, flags);
 909
 910         /* We have to cancel outside of the spinlock */
 911         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 912                 ipoib_mcast_leave(mcast->dev, mcast);
 913                 ipoib_mcast_free(mcast);
 914         }
 915
 916         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 917                 ipoib_mcast_start_thread(dev);
 918 }
 919
 920 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 921 {
 922         struct ipoib_mcast_iter *iter;
 923
 924         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 925         if (!iter)
 926                 return NULL;
 927
 928         iter->dev = dev;
 929         memset(iter->mgid.raw, 0, sizeof iter->mgid);
 930
 931         if (ipoib_mcast_iter_next(iter)) {
 932                 ipoib_mcast_iter_free(iter);
 933                 return NULL;
 934         }
 935
 936         return iter;
 937 }
 938
 939 void ipoib_mcast_iter_free(struct ipoib_mcast_iter *iter)
 940 {
 941         kfree(iter);
 942 }
 943
 944 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 945 {
 946         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 947         struct rb_node *n;
 948         struct ipoib_mcast *mcast;
 949         int ret = 1;
 950
 951         spin_lock_irq(&priv->lock);
 952
 953         n = rb_first(&priv->multicast_tree);
 954
 955         while (n) {
 956                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 957
 958                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 959                            sizeof (union ib_gid)) < 0) {
 960                         iter->mgid      = mcast->mcmember.mgid;
 961                         iter->created   = mcast->created;
 962                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 963                         iter->complete  = !!mcast->ah;
 964                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 965
 966                         ret = 0;
 967
 968                         break;
 969                 }
 970
 971                 n = rb_next(n);
 972         }
 973
 974         spin_unlock_irq(&priv->lock);
 975
 976         return ret;
 977 }
 978
 979 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 980                            union ib_gid *mgid,
 981                            unsigned long *created,
 982                            unsigned int *queuelen,
 983                            unsigned int *complete,
 984                            unsigned int *send_only)
 985 {
 986         *mgid      = iter->mgid;
 987         *created   = iter->created;
 988         *queuelen  = iter->queuelen;
 989         *complete  = iter->complete;
 990         *send_only = iter->send_only;
 991 }