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  * 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                 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 125
 126         kfree(mcast);
 127 }
 128
 129 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
 130                                              int can_sleep)
 131 {
 132         struct ipoib_mcast *mcast;
 133
 134         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
 135         if (!mcast)
 136                 return NULL;
 137
 138         init_completion(&mcast->done);
 139
 140         mcast->dev = dev;
 141         mcast->created = jiffies;
 142         mcast->backoff = 1;
 143         mcast->logcount = 0;
 144
 145         INIT_LIST_HEAD(&mcast->list);
 146         INIT_LIST_HEAD(&mcast->neigh_list);
 147         skb_queue_head_init(&mcast->pkt_queue);
 148
 149         mcast->ah    = NULL;
 150         mcast->query = NULL;
 151
 152         return mcast;
 153 }
 154
 155 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, union ib_gid *mgid)
 156 {
 157         struct ipoib_dev_priv *priv = netdev_priv(dev);
 158         struct rb_node *n = priv->multicast_tree.rb_node;
 159
 160         while (n) {
 161                 struct ipoib_mcast *mcast;
 162                 int ret;
 163
 164                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 165
 166                 ret = memcmp(mgid->raw, mcast->mcmember.mgid.raw,
 167                              sizeof (union ib_gid));
 168                 if (ret < 0)
 169                         n = n->rb_left;
 170                 else if (ret > 0)
 171                         n = n->rb_right;
 172                 else
 173                         return mcast;
 174         }
 175
 176         return NULL;
 177 }
 178
 179 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
 180 {
 181         struct ipoib_dev_priv *priv = netdev_priv(dev);
 182         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 183
 184         while (*n) {
 185                 struct ipoib_mcast *tmcast;
 186                 int ret;
 187
 188                 pn = *n;
 189                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 190
 191                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 192                              sizeof (union ib_gid));
 193                 if (ret < 0)
 194                         n = &pn->rb_left;
 195                 else if (ret > 0)
 196                         n = &pn->rb_right;
 197                 else
 198                         return -EEXIST;
 199         }
 200
 201         rb_link_node(&mcast->rb_node, pn, n);
 202         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 203
 204         return 0;
 205 }
 206
 207 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 208                                    struct ib_sa_mcmember_rec *mcmember)
 209 {
 210         struct net_device *dev = mcast->dev;
 211         struct ipoib_dev_priv *priv = netdev_priv(dev);
 212         int ret;
 213
 214         mcast->mcmember = *mcmember;
 215
 216         /* Set the cached Q_Key before we attach if it's the broadcast group */
 217         if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 218                     sizeof (union ib_gid))) {
 219                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 220                 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 221         }
 222
 223         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 224                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 225                         ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
 226                                    " already attached\n",
 227                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 228
 229                         return 0;
 230                 }
 231
 232                 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
 233                                          &mcast->mcmember.mgid);
 234                 if (ret < 0) {
 235                         ipoib_warn(priv, "couldn't attach QP to multicast group "
 236                                    IPOIB_GID_FMT "\n",
 237                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 238
 239                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 240                         return ret;
 241                 }
 242         }
 243
 244         {
 245                 struct ib_ah_attr av = {
 246                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 247                         .port_num      = priv->port,
 248                         .sl            = mcast->mcmember.sl,
 249                         .ah_flags      = IB_AH_GRH,
 250                         .grh           = {
 251                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 252                                 .hop_limit     = mcast->mcmember.hop_limit,
 253                                 .sgid_index    = 0,
 254                                 .traffic_class = mcast->mcmember.traffic_class
 255                         }
 256                 };
 257                 int path_rate = ib_sa_rate_enum_to_int(mcast->mcmember.rate);
 258
 259                 av.grh.dgid = mcast->mcmember.mgid;
 260
 261                 if (path_rate > 0 && priv->local_rate > path_rate)
 262                         av.static_rate = (priv->local_rate - 1) / path_rate;
 263
 264                 ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n",
 265                                 av.static_rate, priv->local_rate,
 266                                 ib_sa_rate_enum_to_int(mcast->mcmember.rate));
 267
 268                 mcast->ah = ipoib_create_ah(dev, priv->pd, &av);
 269                 if (!mcast->ah) {
 270                         ipoib_warn(priv, "ib_address_create failed\n");
 271                 } else {
 272                         ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
 273                                         " AV %p, LID 0x%04x, SL %d\n",
 274                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 275                                         mcast->ah->ah,
 276                                         be16_to_cpu(mcast->mcmember.mlid),
 277                                         mcast->mcmember.sl);
 278                 }
 279         }
 280
 281         /* actually send any queued packets */
 282         while (!skb_queue_empty(&mcast->pkt_queue)) {
 283                 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
 284
 285                 skb->dev = dev;
 286
 287                 if (!skb->dst || !skb->dst->neighbour) {
 288                         /* put pseudoheader back on for next time */
 289                         skb_push(skb, sizeof (struct ipoib_pseudoheader));
 290                 }
 291
 292                 if (dev_queue_xmit(skb))
 293                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 294         }
 295
 296         return 0;
 297 }
 298
 299 static void
 300 ipoib_mcast_sendonly_join_complete(int status,
 301                                    struct ib_sa_mcmember_rec *mcmember,
 302                                    void *mcast_ptr)
 303 {
 304         struct ipoib_mcast *mcast = mcast_ptr;
 305         struct net_device *dev = mcast->dev;
 306
 307         if (!status)
 308                 ipoib_mcast_join_finish(mcast, mcmember);
 309         else {
 310                 if (mcast->logcount++ < 20)
 311                         ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
 312                                         IPOIB_GID_FMT ", status %d\n",
 313                                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 314
 315                 /* Flush out any queued packets */
 316                 while (!skb_queue_empty(&mcast->pkt_queue))
 317                         dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
 318
 319                 /* Clear the busy flag so we try again */
 320                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 321         }
 322
 323         complete(&mcast->done);
 324 }
 325
 326 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 327 {
 328         struct net_device *dev = mcast->dev;
 329         struct ipoib_dev_priv *priv = netdev_priv(dev);
 330         struct ib_sa_mcmember_rec rec = {
 331 #if 0                           /* Some SMs don't support send-only yet */
 332                 .join_state = 4
 333 #else
 334                 .join_state = 1
 335 #endif
 336         };
 337         int ret = 0;
 338
 339         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 340                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 341                 return -ENODEV;
 342         }
 343
 344         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 345                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 346                 return -EBUSY;
 347         }
 348
 349         rec.mgid     = mcast->mcmember.mgid;
 350         rec.port_gid = priv->local_gid;
 351         rec.pkey     = cpu_to_be16(priv->pkey);
 352
 353         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec,
 354                                      IB_SA_MCMEMBER_REC_MGID            |
 355                                      IB_SA_MCMEMBER_REC_PORT_GID        |
 356                                      IB_SA_MCMEMBER_REC_PKEY            |
 357                                      IB_SA_MCMEMBER_REC_JOIN_STATE,
 358                                      1000, GFP_ATOMIC,
 359                                      ipoib_mcast_sendonly_join_complete,
 360                                      mcast, &mcast->query);
 361         if (ret < 0) {
 362                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed (ret = %d)\n",
 363                            ret);
 364         } else {
 365                 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
 366                                 ", starting join\n",
 367                                 IPOIB_GID_ARG(mcast->mcmember.mgid));
 368
 369                 mcast->query_id = ret;
 370         }
 371
 372         return ret;
 373 }
 374
 375 static void ipoib_mcast_join_complete(int status,
 376                                       struct ib_sa_mcmember_rec *mcmember,
 377                                       void *mcast_ptr)
 378 {
 379         struct ipoib_mcast *mcast = mcast_ptr;
 380         struct net_device *dev = mcast->dev;
 381         struct ipoib_dev_priv *priv = netdev_priv(dev);
 382
 383         ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
 384                         " (status %d)\n",
 385                         IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 386
 387         if (!status && !ipoib_mcast_join_finish(mcast, mcmember)) {
 388                 mcast->backoff = 1;
 389                 down(&mcast_mutex);
 390                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 391                         queue_work(ipoib_workqueue, &priv->mcast_task);
 392                 up(&mcast_mutex);
 393                 complete(&mcast->done);
 394                 return;
 395         }
 396
 397         if (status == -EINTR) {
 398                 complete(&mcast->done);
 399                 return;
 400         }
 401
 402         if (status && mcast->logcount++ < 20) {
 403                 if (status == -ETIMEDOUT || status == -EINTR) {
 404                         ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
 405                                         ", status %d\n",
 406                                         IPOIB_GID_ARG(mcast->mcmember.mgid),
 407                                         status);
 408                 } else {
 409                         ipoib_warn(priv, "multicast join failed for "
 410                                    IPOIB_GID_FMT ", status %d\n",
 411                                    IPOIB_GID_ARG(mcast->mcmember.mgid),
 412                                    status);
 413                 }
 414         }
 415
 416         mcast->backoff *= 2;
 417         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 418                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 419
 420         mcast->query = NULL;
 421
 422         down(&mcast_mutex);
 423         if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
 424                 if (status == -ETIMEDOUT)
 425                         queue_work(ipoib_workqueue, &priv->mcast_task);
 426                 else
 427                         queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 428                                            mcast->backoff * HZ);
 429         } else
 430                 complete(&mcast->done);
 431         up(&mcast_mutex);
 432
 433         return;
 434 }
 435
 436 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
 437                              int create)
 438 {
 439         struct ipoib_dev_priv *priv = netdev_priv(dev);
 440         struct ib_sa_mcmember_rec rec = {
 441                 .join_state = 1
 442         };
 443         ib_sa_comp_mask comp_mask;
 444         int ret = 0;
 445
 446         ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
 447                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 448
 449         rec.mgid     = mcast->mcmember.mgid;
 450         rec.port_gid = priv->local_gid;
 451         rec.pkey     = cpu_to_be16(priv->pkey);
 452
 453         comp_mask =
 454                 IB_SA_MCMEMBER_REC_MGID         |
 455                 IB_SA_MCMEMBER_REC_PORT_GID     |
 456                 IB_SA_MCMEMBER_REC_PKEY         |
 457                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 458
 459         if (create) {
 460                 comp_mask |=
 461                         IB_SA_MCMEMBER_REC_QKEY         |
 462                         IB_SA_MCMEMBER_REC_SL           |
 463                         IB_SA_MCMEMBER_REC_FLOW_LABEL   |
 464                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
 465
 466                 rec.qkey          = priv->broadcast->mcmember.qkey;
 467                 rec.sl            = priv->broadcast->mcmember.sl;
 468                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 469                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 470         }
 471
 472         ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec, comp_mask,
 473                                      mcast->backoff * 1000, GFP_ATOMIC,
 474                                      ipoib_mcast_join_complete,
 475                                      mcast, &mcast->query);
 476
 477         if (ret < 0) {
 478                 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
 479
 480                 mcast->backoff *= 2;
 481                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 482                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 483
 484                 down(&mcast_mutex);
 485                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 486                         queue_delayed_work(ipoib_workqueue,
 487                                            &priv->mcast_task,
 488                                            mcast->backoff * HZ);
 489                 up(&mcast_mutex);
 490         } else
 491                 mcast->query_id = ret;
 492 }
 493
 494 void ipoib_mcast_join_task(void *dev_ptr)
 495 {
 496         struct net_device *dev = dev_ptr;
 497         struct ipoib_dev_priv *priv = netdev_priv(dev);
 498
 499         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 500                 return;
 501
 502         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
 503                 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
 504         else
 505                 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
 506
 507         {
 508                 struct ib_port_attr attr;
 509
 510                 if (!ib_query_port(priv->ca, priv->port, &attr)) {
 511                         priv->local_lid  = attr.lid;
 512                         priv->local_rate = attr.active_speed *
 513                                 ib_width_enum_to_int(attr.active_width);
 514                 } else
 515                         ipoib_warn(priv, "ib_query_port failed\n");
 516         }
 517
 518         if (!priv->broadcast) {
 519                 priv->broadcast = ipoib_mcast_alloc(dev, 1);
 520                 if (!priv->broadcast) {
 521                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 522                         down(&mcast_mutex);
 523                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 524                                 queue_delayed_work(ipoib_workqueue,
 525                                                    &priv->mcast_task, HZ);
 526                         up(&mcast_mutex);
 527                         return;
 528                 }
 529
 530                 memcpy(priv->broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
 531                        sizeof (union ib_gid));
 532
 533                 spin_lock_irq(&priv->lock);
 534                 __ipoib_mcast_add(dev, priv->broadcast);
 535                 spin_unlock_irq(&priv->lock);
 536         }
 537
 538         if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 539                 ipoib_mcast_join(dev, priv->broadcast, 0);
 540                 return;
 541         }
 542
 543         while (1) {
 544                 struct ipoib_mcast *mcast = NULL;
 545
 546                 spin_lock_irq(&priv->lock);
 547                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 548                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 549                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 550                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 551                                 /* Found the next unjoined group */
 552                                 break;
 553                         }
 554                 }
 555                 spin_unlock_irq(&priv->lock);
 556
 557                 if (&mcast->list == &priv->multicast_list) {
 558                         /* All done */
 559                         break;
 560                 }
 561
 562                 ipoib_mcast_join(dev, mcast, 1);
 563                 return;
 564         }
 565
 566         priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
 567                 IPOIB_ENCAP_LEN;
 568         dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
 569
 570         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 571
 572         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 573         netif_carrier_on(dev);
 574 }
 575
 576 int ipoib_mcast_start_thread(struct net_device *dev)
 577 {
 578         struct ipoib_dev_priv *priv = netdev_priv(dev);
 579
 580         ipoib_dbg_mcast(priv, "starting multicast thread\n");
 581
 582         down(&mcast_mutex);
 583         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 584                 queue_work(ipoib_workqueue, &priv->mcast_task);
 585         up(&mcast_mutex);
 586
 587         return 0;
 588 }
 589
 590 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 591 {
 592         struct ipoib_dev_priv *priv = netdev_priv(dev);
 593         struct ipoib_mcast *mcast;
 594
 595         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 596
 597         down(&mcast_mutex);
 598         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 599         cancel_delayed_work(&priv->mcast_task);
 600         up(&mcast_mutex);
 601
 602         if (flush)
 603                 flush_workqueue(ipoib_workqueue);
 604
 605         if (priv->broadcast && priv->broadcast->query) {
 606                 ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
 607                 priv->broadcast->query = NULL;
 608                 ipoib_dbg_mcast(priv, "waiting for bcast\n");
 609                 wait_for_completion(&priv->broadcast->done);
 610         }
 611
 612         list_for_each_entry(mcast, &priv->multicast_list, list) {
 613                 if (mcast->query) {
 614                         ib_sa_cancel_query(mcast->query_id, mcast->query);
 615                         mcast->query = NULL;
 616                         ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
 617                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 618                         wait_for_completion(&mcast->done);
 619                 }
 620         }
 621
 622         return 0;
 623 }
 624
 625 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 626 {
 627         struct ipoib_dev_priv *priv = netdev_priv(dev);
 628         struct ib_sa_mcmember_rec rec = {
 629                 .join_state = 1
 630         };
 631         int ret = 0;
 632
 633         if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
 634                 return 0;
 635
 636         ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
 637                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 638
 639         rec.mgid     = mcast->mcmember.mgid;
 640         rec.port_gid = priv->local_gid;
 641         rec.pkey     = cpu_to_be16(priv->pkey);
 642
 643         /* Remove ourselves from the multicast group */
 644         ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
 645                                  &mcast->mcmember.mgid);
 646         if (ret)
 647                 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
 648
 649         /*
 650          * Just make one shot at leaving and don't wait for a reply;
 651          * if we fail, too bad.
 652          */
 653         ret = ib_sa_mcmember_rec_delete(priv->ca, priv->port, &rec,
 654                                         IB_SA_MCMEMBER_REC_MGID         |
 655                                         IB_SA_MCMEMBER_REC_PORT_GID     |
 656                                         IB_SA_MCMEMBER_REC_PKEY         |
 657                                         IB_SA_MCMEMBER_REC_JOIN_STATE,
 658                                         0, GFP_ATOMIC, NULL,
 659                                         mcast, &mcast->query);
 660         if (ret < 0)
 661                 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
 662                            "for leave (result = %d)\n", ret);
 663
 664         return 0;
 665 }
 666
 667 void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
 668                       struct sk_buff *skb)
 669 {
 670         struct ipoib_dev_priv *priv = netdev_priv(dev);
 671         struct ipoib_mcast *mcast;
 672
 673         /*
 674          * We can only be called from ipoib_start_xmit, so we're
 675          * inside tx_lock -- no need to save/restore flags.
 676          */
 677         spin_lock(&priv->lock);
 678
 679         mcast = __ipoib_mcast_find(dev, mgid);
 680         if (!mcast) {
 681                 /* Let's create a new send only group now */
 682                 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
 683                                 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(*mgid));
 684
 685                 mcast = ipoib_mcast_alloc(dev, 0);
 686                 if (!mcast) {
 687                         ipoib_warn(priv, "unable to allocate memory for "
 688                                    "multicast structure\n");
 689                         dev_kfree_skb_any(skb);
 690                         goto out;
 691                 }
 692
 693                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 694                 mcast->mcmember.mgid = *mgid;
 695                 __ipoib_mcast_add(dev, mcast);
 696                 list_add_tail(&mcast->list, &priv->multicast_list);
 697         }
 698
 699         if (!mcast->ah) {
 700                 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 701                         skb_queue_tail(&mcast->pkt_queue, skb);
 702                 else
 703                         dev_kfree_skb_any(skb);
 704
 705                 if (mcast->query)
 706                         ipoib_dbg_mcast(priv, "no address vector, "
 707                                         "but multicast join already started\n");
 708                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 709                         ipoib_mcast_sendonly_join(mcast);
 710
 711                 /*
 712                  * If lookup completes between here and out:, don't
 713                  * want to send packet twice.
 714                  */
 715                 mcast = NULL;
 716         }
 717
 718 out:
 719         if (mcast && mcast->ah) {
 720                 if (skb->dst            &&
 721                     skb->dst->neighbour &&
 722                     !*to_ipoib_neigh(skb->dst->neighbour)) {
 723                         struct ipoib_neigh *neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
 724
 725                         if (neigh) {
 726                                 kref_get(&mcast->ah->ref);
 727                                 neigh->ah       = mcast->ah;
 728                                 neigh->neighbour = skb->dst->neighbour;
 729                                 *to_ipoib_neigh(skb->dst->neighbour) = neigh;
 730                                 list_add_tail(&neigh->list, &mcast->neigh_list);
 731                         }
 732                 }
 733
 734                 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
 735         }
 736
 737         spin_unlock(&priv->lock);
 738 }
 739
 740 void ipoib_mcast_dev_flush(struct net_device *dev)
 741 {
 742         struct ipoib_dev_priv *priv = netdev_priv(dev);
 743         LIST_HEAD(remove_list);
 744         struct ipoib_mcast *mcast, *tmcast, *nmcast;
 745         unsigned long flags;
 746
 747         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 748
 749         spin_lock_irqsave(&priv->lock, flags);
 750         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 751                 nmcast = ipoib_mcast_alloc(dev, 0);
 752                 if (nmcast) {
 753                         nmcast->flags =
 754                                 mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY);
 755
 756                         nmcast->mcmember.mgid = mcast->mcmember.mgid;
 757
 758                         /* Add the new group in before the to-be-destroyed group */
 759                         list_add_tail(&nmcast->list, &mcast->list);
 760                         list_del_init(&mcast->list);
 761
 762                         rb_replace_node(&mcast->rb_node, &nmcast->rb_node,
 763                                         &priv->multicast_tree);
 764
 765                         list_add_tail(&mcast->list, &remove_list);
 766                 } else {
 767                         ipoib_warn(priv, "could not reallocate multicast group "
 768                                    IPOIB_GID_FMT "\n",
 769                                    IPOIB_GID_ARG(mcast->mcmember.mgid));
 770                 }
 771         }
 772
 773         if (priv->broadcast) {
 774                 nmcast = ipoib_mcast_alloc(dev, 0);
 775                 if (nmcast) {
 776                         nmcast->mcmember.mgid = priv->broadcast->mcmember.mgid;
 777
 778                         rb_replace_node(&priv->broadcast->rb_node,
 779                                         &nmcast->rb_node,
 780                                         &priv->multicast_tree);
 781
 782                         list_add_tail(&priv->broadcast->list, &remove_list);
 783                 }
 784
 785                 priv->broadcast = nmcast;
 786         }
 787
 788         spin_unlock_irqrestore(&priv->lock, flags);
 789
 790         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 791                 ipoib_mcast_leave(dev, mcast);
 792                 ipoib_mcast_free(mcast);
 793         }
 794 }
 795
 796 void ipoib_mcast_dev_down(struct net_device *dev)
 797 {
 798         struct ipoib_dev_priv *priv = netdev_priv(dev);
 799         unsigned long flags;
 800
 801         /* Delete broadcast since it will be recreated */
 802         if (priv->broadcast) {
 803                 ipoib_dbg_mcast(priv, "deleting broadcast group\n");
 804
 805                 spin_lock_irqsave(&priv->lock, flags);
 806                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 807                 spin_unlock_irqrestore(&priv->lock, flags);
 808                 ipoib_mcast_leave(dev, priv->broadcast);
 809                 ipoib_mcast_free(priv->broadcast);
 810                 priv->broadcast = NULL;
 811         }
 812 }
 813
 814 void ipoib_mcast_restart_task(void *dev_ptr)
 815 {
 816         struct net_device *dev = dev_ptr;
 817         struct ipoib_dev_priv *priv = netdev_priv(dev);
 818         struct dev_mc_list *mclist;
 819         struct ipoib_mcast *mcast, *tmcast;
 820         LIST_HEAD(remove_list);
 821         unsigned long flags;
 822
 823         ipoib_dbg_mcast(priv, "restarting multicast task\n");
 824
 825         ipoib_mcast_stop_thread(dev, 0);
 826
 827         spin_lock_irqsave(&priv->lock, flags);
 828
 829         /*
 830          * Unfortunately, the networking core only gives us a list of all of
 831          * the multicast hardware addresses. We need to figure out which ones
 832          * are new and which ones have been removed
 833          */
 834
 835         /* Clear out the found flag */
 836         list_for_each_entry(mcast, &priv->multicast_list, list)
 837                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 838
 839         /* Mark all of the entries that are found or don't exist */
 840         for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
 841                 union ib_gid mgid;
 842
 843                 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
 844
 845                 /* Add in the P_Key */
 846                 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
 847                 mgid.raw[5] = priv->pkey & 0xff;
 848
 849                 mcast = __ipoib_mcast_find(dev, &mgid);
 850                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 851                         struct ipoib_mcast *nmcast;
 852
 853                         /* Not found or send-only group, let's add a new entry */
 854                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
 855                                         IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
 856
 857                         nmcast = ipoib_mcast_alloc(dev, 0);
 858                         if (!nmcast) {
 859                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 860                                 continue;
 861                         }
 862
 863                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 864
 865                         nmcast->mcmember.mgid = mgid;
 866
 867                         if (mcast) {
 868                                 /* Destroy the send only entry */
 869                                 list_del(&mcast->list);
 870                                 list_add_tail(&mcast->list, &remove_list);
 871
 872                                 rb_replace_node(&mcast->rb_node,
 873                                                 &nmcast->rb_node,
 874                                                 &priv->multicast_tree);
 875                         } else
 876                                 __ipoib_mcast_add(dev, nmcast);
 877
 878                         list_add_tail(&nmcast->list, &priv->multicast_list);
 879                 }
 880
 881                 if (mcast)
 882                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 883         }
 884
 885         /* Remove all of the entries don't exist anymore */
 886         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 887                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 888                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 889                         ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
 890                                         IPOIB_GID_ARG(mcast->mcmember.mgid));
 891
 892                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 893
 894                         /* Move to the remove list */
 895                         list_del(&mcast->list);
 896                         list_add_tail(&mcast->list, &remove_list);
 897                 }
 898         }
 899         spin_unlock_irqrestore(&priv->lock, flags);
 900
 901         /* We have to cancel outside of the spinlock */
 902         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 903                 ipoib_mcast_leave(mcast->dev, mcast);
 904                 ipoib_mcast_free(mcast);
 905         }
 906
 907         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 908                 ipoib_mcast_start_thread(dev);
 909 }
 910
 911 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 912
 913 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
 914 {
 915         struct ipoib_mcast_iter *iter;
 916
 917         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 918         if (!iter)
 919                 return NULL;
 920
 921         iter->dev = dev;
 922         memset(iter->mgid.raw, 0, 16);
 923
 924         if (ipoib_mcast_iter_next(iter)) {
 925                 kfree(iter);
 926                 return NULL;
 927         }
 928
 929         return iter;
 930 }
 931
 932 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 933 {
 934         struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
 935         struct rb_node *n;
 936         struct ipoib_mcast *mcast;
 937         int ret = 1;
 938
 939         spin_lock_irq(&priv->lock);
 940
 941         n = rb_first(&priv->multicast_tree);
 942
 943         while (n) {
 944                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 945
 946                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 947                            sizeof (union ib_gid)) < 0) {
 948                         iter->mgid      = mcast->mcmember.mgid;
 949                         iter->created   = mcast->created;
 950                         iter->queuelen  = skb_queue_len(&mcast->pkt_queue);
 951                         iter->complete  = !!mcast->ah;
 952                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 953
 954                         ret = 0;
 955
 956                         break;
 957                 }
 958
 959                 n = rb_next(n);
 960         }
 961
 962         spin_unlock_irq(&priv->lock);
 963
 964         return ret;
 965 }
 966
 967 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 968                            union ib_gid *mgid,
 969                            unsigned long *created,
 970                            unsigned int *queuelen,
 971                            unsigned int *complete,
 972                            unsigned int *send_only)
 973 {
 974         *mgid      = iter->mgid;
 975         *created   = iter->created;
 976         *queuelen  = iter->queuelen;
 977         *complete  = iter->complete;
 978         *send_only = iter->send_only;
 979 }
 980
 981 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */