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