sys/ofed/drivers/infiniband/ulp/ipoib/ipoib_multicast.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
   3  *
   4  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 #include "ipoib.h"
  41
  42 #include <linux/delay.h>
  43 #include <linux/completion.h>
  44
  45 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
  46 static int mcast_debug_level = 1;
  47
  48 module_param(mcast_debug_level, int, 0644);
  49 MODULE_PARM_DESC(mcast_debug_level,
  50                  "Enable multicast debug tracing if > 0");
  51 #endif
  52
  53 static DEFINE_MUTEX(mcast_mutex);
  54
  55 struct ipoib_mcast_iter {
  56         struct ipoib_dev_priv *priv;
  57         union ib_gid       mgid;
  58         unsigned long      created;
  59         unsigned int       queuelen;
  60         unsigned int       complete;
  61         unsigned int       send_only;
  62 };
  63
  64 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
  65 {
  66         struct ifnet *dev = mcast->priv->dev;
  67         int tx_dropped = 0;
  68
  69         ipoib_dbg_mcast(mcast->priv, "deleting multicast group %16D\n",
  70                         mcast->mcmember.mgid.raw, ":");
  71
  72         if (mcast->ah)
  73                 ipoib_put_ah(mcast->ah);
  74
  75         tx_dropped = mcast->pkt_queue.ifq_len;
  76         _IF_DRAIN(&mcast->pkt_queue);   /* XXX Locking. */
  77
  78         if_inc_counter(dev, IFCOUNTER_OERRORS, tx_dropped);
  79
  80         kfree(mcast);
  81 }
  82
  83 static struct ipoib_mcast *ipoib_mcast_alloc(struct ipoib_dev_priv *priv,
  84                                              int can_sleep)
  85 {
  86         struct ipoib_mcast *mcast;
  87
  88         mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
  89         if (!mcast)
  90                 return NULL;
  91
  92         mcast->priv = priv;
  93         mcast->created = jiffies;
  94         mcast->backoff = 1;
  95
  96         INIT_LIST_HEAD(&mcast->list);
  97         bzero(&mcast->pkt_queue, sizeof(mcast->pkt_queue));
  98
  99         return mcast;
 100 }
 101
 102 static struct ipoib_mcast *__ipoib_mcast_find(struct ipoib_dev_priv *priv,
 103     void *mgid)
 104 {
 105         struct rb_node *n = priv->multicast_tree.rb_node;
 106
 107         while (n) {
 108                 struct ipoib_mcast *mcast;
 109                 int ret;
 110
 111                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 112
 113                 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
 114                              sizeof (union ib_gid));
 115                 if (ret < 0)
 116                         n = n->rb_left;
 117                 else if (ret > 0)
 118                         n = n->rb_right;
 119                 else
 120                         return mcast;
 121         }
 122
 123         return NULL;
 124 }
 125
 126 static int __ipoib_mcast_add(struct ipoib_dev_priv *priv,
 127     struct ipoib_mcast *mcast)
 128 {
 129         struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
 130
 131         while (*n) {
 132                 struct ipoib_mcast *tmcast;
 133                 int ret;
 134
 135                 pn = *n;
 136                 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
 137
 138                 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
 139                              sizeof (union ib_gid));
 140                 if (ret < 0)
 141                         n = &pn->rb_left;
 142                 else if (ret > 0)
 143                         n = &pn->rb_right;
 144                 else
 145                         return -EEXIST;
 146         }
 147
 148         rb_link_node(&mcast->rb_node, pn, n);
 149         rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
 150
 151         return 0;
 152 }
 153
 154 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 155                                    struct ib_sa_mcmember_rec *mcmember)
 156 {
 157         struct ipoib_dev_priv *priv = mcast->priv;
 158         struct ifnet *dev = priv->dev;
 159         struct ipoib_ah *ah;
 160         int ret;
 161         int set_qkey = 0;
 162
 163         mcast->mcmember = *mcmember;
 164
 165         /* Set the cached Q_Key before we attach if it's the broadcast group */
 166         if (!memcmp(mcast->mcmember.mgid.raw, dev->if_broadcastaddr + 4,
 167                     sizeof (union ib_gid))) {
 168                 spin_lock_irq(&priv->lock);
 169                 if (!priv->broadcast) {
 170                         spin_unlock_irq(&priv->lock);
 171                         return -EAGAIN;
 172                 }
 173                 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
 174                 spin_unlock_irq(&priv->lock);
 175                 priv->tx_wr.remote_qkey = priv->qkey;
 176                 set_qkey = 1;
 177         }
 178
 179         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 180                 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 181                         ipoib_warn(priv, "multicast group %16D already attached\n",
 182                                    mcast->mcmember.mgid.raw, ":");
 183
 184                         return 0;
 185                 }
 186
 187                 ret = ipoib_mcast_attach(priv, be16_to_cpu(mcast->mcmember.mlid),
 188                                          &mcast->mcmember.mgid, set_qkey);
 189                 if (ret < 0) {
 190                         ipoib_warn(priv, "couldn't attach QP to multicast group %16D\n",
 191                                    mcast->mcmember.mgid.raw, ":");
 192
 193                         clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
 194                         return ret;
 195                 }
 196         }
 197
 198         {
 199                 struct ib_ah_attr av = {
 200                         .dlid          = be16_to_cpu(mcast->mcmember.mlid),
 201                         .port_num      = priv->port,
 202                         .sl            = mcast->mcmember.sl,
 203                         .ah_flags      = IB_AH_GRH,
 204                         .static_rate   = mcast->mcmember.rate,
 205                         .grh           = {
 206                                 .flow_label    = be32_to_cpu(mcast->mcmember.flow_label),
 207                                 .hop_limit     = mcast->mcmember.hop_limit,
 208                                 .sgid_index    = 0,
 209                                 .traffic_class = mcast->mcmember.traffic_class
 210                         }
 211                 };
 212                 av.grh.dgid = mcast->mcmember.mgid;
 213
 214                 ah = ipoib_create_ah(priv, priv->pd, &av);
 215                 if (!ah) {
 216                         ipoib_warn(priv, "ib_address_create failed\n");
 217                 } else {
 218                         spin_lock_irq(&priv->lock);
 219                         mcast->ah = ah;
 220                         spin_unlock_irq(&priv->lock);
 221
 222                         ipoib_dbg_mcast(priv, "MGID %16D AV %p, LID 0x%04x, SL %d\n",
 223                                         mcast->mcmember.mgid.raw, ":",
 224                                         mcast->ah->ah,
 225                                         be16_to_cpu(mcast->mcmember.mlid),
 226                                         mcast->mcmember.sl);
 227                 }
 228         }
 229
 230         /* actually send any queued packets */
 231         while (mcast->pkt_queue.ifq_len) {
 232                 struct mbuf *mb;
 233                 _IF_DEQUEUE(&mcast->pkt_queue, mb);
 234                 mb->m_pkthdr.rcvif = dev;
 235
 236                 if (dev->if_transmit(dev, mb))
 237                         ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
 238         }
 239
 240         return 0;
 241 }
 242
 243 static int
 244 ipoib_mcast_sendonly_join_complete(int status,
 245                                    struct ib_sa_multicast *multicast)
 246 {
 247         struct ipoib_mcast *mcast = multicast->context;
 248         struct ipoib_dev_priv *priv = mcast->priv;
 249
 250         /* We trap for port events ourselves. */
 251         if (status == -ENETRESET)
 252                 return 0;
 253
 254         if (!status)
 255                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 256
 257         if (status) {
 258                 if (mcast->logcount++ < 20)
 259                         ipoib_dbg_mcast(priv, "multicast join failed for %16D, status %d\n",
 260                                         mcast->mcmember.mgid.raw, ":", status);
 261
 262                 /* Flush out any queued packets */
 263                 if_inc_counter(priv->dev, IFCOUNTER_OERRORS, mcast->pkt_queue.ifq_len);
 264                 _IF_DRAIN(&mcast->pkt_queue);
 265
 266                 /* Clear the busy flag so we try again */
 267                 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
 268                                             &mcast->flags);
 269         }
 270         return status;
 271 }
 272
 273 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
 274 {
 275         struct ipoib_dev_priv *priv = mcast->priv;
 276         struct ib_sa_mcmember_rec rec = {
 277 #if 0                           /* Some SMs don't support send-only yet */
 278                 .join_state = 4
 279 #else
 280                 .join_state = 1
 281 #endif
 282         };
 283         int ret = 0;
 284
 285         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
 286                 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
 287                 return -ENODEV;
 288         }
 289
 290         if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
 291                 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
 292                 return -EBUSY;
 293         }
 294
 295         rec.mgid     = mcast->mcmember.mgid;
 296         rec.port_gid = priv->local_gid;
 297         rec.pkey     = cpu_to_be16(priv->pkey);
 298
 299         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
 300                                          priv->port, &rec,
 301                                          IB_SA_MCMEMBER_REC_MGID        |
 302                                          IB_SA_MCMEMBER_REC_PORT_GID    |
 303                                          IB_SA_MCMEMBER_REC_PKEY        |
 304                                          IB_SA_MCMEMBER_REC_JOIN_STATE,
 305                                          GFP_ATOMIC,
 306                                          ipoib_mcast_sendonly_join_complete,
 307                                          mcast);
 308         if (IS_ERR(mcast->mc)) {
 309                 ret = PTR_ERR(mcast->mc);
 310                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 311                 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
 312                            ret);
 313         } else {
 314                 ipoib_dbg_mcast(priv, "no multicast record for %16D, starting join\n",
 315                                 mcast->mcmember.mgid.raw, ":");
 316         }
 317
 318         return ret;
 319 }
 320
 321 void ipoib_mcast_carrier_on_task(struct work_struct *work)
 322 {
 323         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 324                                                    carrier_on_task);
 325         struct ib_port_attr attr;
 326
 327         /*
 328          * Take rtnl_lock to avoid racing with ipoib_stop() and
 329          * turning the carrier back on while a device is being
 330          * removed.
 331          */
 332         if (ib_query_port(priv->ca, priv->port, &attr) ||
 333             attr.state != IB_PORT_ACTIVE) {
 334                 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
 335                 return;
 336         }
 337         if_link_state_change(priv->dev, LINK_STATE_UP);
 338 }
 339
 340 static int ipoib_mcast_join_complete(int status,
 341                                      struct ib_sa_multicast *multicast)
 342 {
 343         struct ipoib_mcast *mcast = multicast->context;
 344         struct ipoib_dev_priv *priv = mcast->priv;
 345
 346         ipoib_dbg_mcast(priv, "join completion for %16D (status %d)\n",
 347                         mcast->mcmember.mgid.raw, ":", status);
 348
 349         /* We trap for port events ourselves. */
 350         if (status == -ENETRESET)
 351                 return 0;
 352
 353         if (!status)
 354                 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
 355
 356         if (!status) {
 357                 mcast->backoff = 1;
 358                 mutex_lock(&mcast_mutex);
 359                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 360                         queue_delayed_work(ipoib_workqueue,
 361                                            &priv->mcast_task, 0);
 362                 mutex_unlock(&mcast_mutex);
 363
 364                 /*
 365                  * Defer carrier on work to ipoib_workqueue to avoid a
 366                  * deadlock on rtnl_lock here.
 367                  */
 368                 if (mcast == priv->broadcast)
 369                         queue_work(ipoib_workqueue, &priv->carrier_on_task);
 370
 371                 return 0;
 372         }
 373
 374         if (mcast->logcount++ < 20) {
 375                 if (status == -ETIMEDOUT || status == -EAGAIN) {
 376                         ipoib_dbg_mcast(priv, "multicast join failed for %16D, status %d\n",
 377                                         mcast->mcmember.mgid.raw, ":", status);
 378                 } else {
 379                         ipoib_warn(priv, "multicast join failed for %16D, status %d\n",
 380                                    mcast->mcmember.mgid.raw, ":", status);
 381                 }
 382         }
 383
 384         mcast->backoff *= 2;
 385         if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 386                 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 387
 388         /* Clear the busy flag so we try again */
 389         status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 390
 391         mutex_lock(&mcast_mutex);
 392         spin_lock_irq(&priv->lock);
 393         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 394                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
 395                                    mcast->backoff * HZ);
 396         spin_unlock_irq(&priv->lock);
 397         mutex_unlock(&mcast_mutex);
 398
 399         return status;
 400 }
 401
 402 static void ipoib_mcast_join(struct ipoib_dev_priv *priv,
 403     struct ipoib_mcast *mcast, int create)
 404 {
 405         struct ib_sa_mcmember_rec rec = {
 406                 .join_state = 1
 407         };
 408         ib_sa_comp_mask comp_mask;
 409         int ret = 0;
 410
 411         ipoib_dbg_mcast(priv, "joining MGID %16D\n",
 412             mcast->mcmember.mgid.raw, ":");
 413
 414         rec.mgid     = mcast->mcmember.mgid;
 415         rec.port_gid = priv->local_gid;
 416         rec.pkey     = cpu_to_be16(priv->pkey);
 417
 418         comp_mask =
 419                 IB_SA_MCMEMBER_REC_MGID         |
 420                 IB_SA_MCMEMBER_REC_PORT_GID     |
 421                 IB_SA_MCMEMBER_REC_PKEY         |
 422                 IB_SA_MCMEMBER_REC_JOIN_STATE;
 423
 424         if (create) {
 425                 comp_mask |=
 426                         IB_SA_MCMEMBER_REC_QKEY                 |
 427                         IB_SA_MCMEMBER_REC_MTU_SELECTOR         |
 428                         IB_SA_MCMEMBER_REC_MTU                  |
 429                         IB_SA_MCMEMBER_REC_TRAFFIC_CLASS        |
 430                         IB_SA_MCMEMBER_REC_RATE_SELECTOR        |
 431                         IB_SA_MCMEMBER_REC_RATE                 |
 432                         IB_SA_MCMEMBER_REC_SL                   |
 433                         IB_SA_MCMEMBER_REC_FLOW_LABEL           |
 434                         IB_SA_MCMEMBER_REC_HOP_LIMIT;
 435
 436                 rec.qkey          = priv->broadcast->mcmember.qkey;
 437                 rec.mtu_selector  = IB_SA_EQ;
 438                 rec.mtu           = priv->broadcast->mcmember.mtu;
 439                 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
 440                 rec.rate_selector = IB_SA_EQ;
 441                 rec.rate          = priv->broadcast->mcmember.rate;
 442                 rec.sl            = priv->broadcast->mcmember.sl;
 443                 rec.flow_label    = priv->broadcast->mcmember.flow_label;
 444                 rec.hop_limit     = priv->broadcast->mcmember.hop_limit;
 445         }
 446
 447         set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 448         mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
 449                                          &rec, comp_mask, GFP_KERNEL,
 450                                          ipoib_mcast_join_complete, mcast);
 451         if (IS_ERR(mcast->mc)) {
 452                 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
 453                 ret = PTR_ERR(mcast->mc);
 454                 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
 455
 456                 mcast->backoff *= 2;
 457                 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
 458                         mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
 459
 460                 mutex_lock(&mcast_mutex);
 461                 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 462                         queue_delayed_work(ipoib_workqueue,
 463                                            &priv->mcast_task,
 464                                            mcast->backoff * HZ);
 465                 mutex_unlock(&mcast_mutex);
 466         }
 467 }
 468
 469 void ipoib_mcast_join_task(struct work_struct *work)
 470 {
 471         struct ipoib_dev_priv *priv =
 472                 container_of(work, struct ipoib_dev_priv, mcast_task.work);
 473         struct ifnet *dev = priv->dev;
 474         struct ib_port_attr attr;
 475
 476         ipoib_dbg_mcast(priv, "Running join task. flags 0x%lX\n", priv->flags);
 477
 478         if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
 479                 return;
 480
 481         if (ib_query_port(priv->ca, priv->port, &attr) ||
 482             attr.state != IB_PORT_ACTIVE) {
 483                 ipoib_dbg(priv, "%s: port state is not ACTIVE (state = %d) suspend task.\n",
 484                           __func__, attr.state);
 485                 return;
 486         }
 487
 488         if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid, NULL))
 489                 ipoib_warn(priv, "ib_query_gid() failed\n");
 490         else
 491                 memcpy(IF_LLADDR(dev) + 4, priv->local_gid.raw, sizeof (union ib_gid));
 492
 493         {
 494                 struct ib_port_attr attr;
 495
 496                 if (!ib_query_port(priv->ca, priv->port, &attr))
 497                         priv->local_lid = attr.lid;
 498                 else
 499                         ipoib_warn(priv, "ib_query_port failed\n");
 500         }
 501
 502         if (!priv->broadcast) {
 503                 struct ipoib_mcast *broadcast;
 504
 505                 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 506                         return;
 507
 508                 broadcast = ipoib_mcast_alloc(priv, 1);
 509                 if (!broadcast) {
 510                         ipoib_warn(priv, "failed to allocate broadcast group\n");
 511                         mutex_lock(&mcast_mutex);
 512                         if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
 513                                 queue_delayed_work(ipoib_workqueue,
 514                                                    &priv->mcast_task, HZ);
 515                         mutex_unlock(&mcast_mutex);
 516                         return;
 517                 }
 518
 519                 spin_lock_irq(&priv->lock);
 520                 memcpy(broadcast->mcmember.mgid.raw, dev->if_broadcastaddr + 4,
 521                        sizeof (union ib_gid));
 522                 priv->broadcast = broadcast;
 523
 524                 __ipoib_mcast_add(priv, priv->broadcast);
 525                 spin_unlock_irq(&priv->lock);
 526         }
 527
 528         if (priv->broadcast &&
 529             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 530                 if (priv->broadcast &&
 531                     !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
 532                         ipoib_mcast_join(priv, priv->broadcast, 0);
 533                 return;
 534         }
 535
 536         while (1) {
 537                 struct ipoib_mcast *mcast = NULL;
 538
 539                 spin_lock_irq(&priv->lock);
 540                 list_for_each_entry(mcast, &priv->multicast_list, list) {
 541                         if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
 542                             && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
 543                             && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 544                                 /* Found the next unjoined group */
 545                                 break;
 546                         }
 547                 }
 548                 spin_unlock_irq(&priv->lock);
 549
 550                 if (&mcast->list == &priv->multicast_list) {
 551                         /* All done */
 552                         break;
 553                 }
 554
 555                 ipoib_mcast_join(priv, mcast, 1);
 556                 return;
 557         }
 558
 559         spin_lock_irq(&priv->lock);
 560         if (priv->broadcast)
 561                 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
 562         else
 563                 priv->mcast_mtu = priv->admin_mtu;
 564         spin_unlock_irq(&priv->lock);
 565
 566         if (!ipoib_cm_admin_enabled(priv))
 567                 ipoib_change_mtu(priv, min(priv->mcast_mtu, priv->admin_mtu));
 568
 569         ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
 570
 571         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 572 }
 573
 574 int ipoib_mcast_start_thread(struct ipoib_dev_priv *priv)
 575 {
 576         ipoib_dbg_mcast(priv, "starting multicast thread flags 0x%lX\n",
 577             priv->flags);
 578
 579         mutex_lock(&mcast_mutex);
 580         if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
 581                 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 582         mutex_unlock(&mcast_mutex);
 583
 584         return 0;
 585 }
 586
 587 int ipoib_mcast_stop_thread(struct ipoib_dev_priv *priv, int flush)
 588 {
 589
 590         ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 591
 592         mutex_lock(&mcast_mutex);
 593         clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 594         cancel_delayed_work(&priv->mcast_task);
 595         mutex_unlock(&mcast_mutex);
 596
 597         if (flush)
 598                 flush_workqueue(ipoib_workqueue);
 599
 600         return 0;
 601 }
 602
 603 static int ipoib_mcast_leave(struct ipoib_dev_priv *priv, struct ipoib_mcast *mcast)
 604 {
 605         int ret = 0;
 606
 607         if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 608                 ib_sa_free_multicast(mcast->mc);
 609
 610         if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
 611                 ipoib_dbg_mcast(priv, "leaving MGID %16D\n",
 612                                 mcast->mcmember.mgid.raw, ":");
 613
 614                 /* Remove ourselves from the multicast group */
 615                 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
 616                                       be16_to_cpu(mcast->mcmember.mlid));
 617                 if (ret)
 618                         ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 619         }
 620
 621         return 0;
 622 }
 623
 624 void
 625 ipoib_mcast_send(struct ipoib_dev_priv *priv, void *mgid, struct mbuf *mb)
 626 {
 627         struct ifnet *dev = priv->dev;
 628         struct ipoib_mcast *mcast;
 629
 630         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)         ||
 631             !priv->broadcast                                    ||
 632             !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
 633                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 634                 m_freem(mb);
 635                 return;
 636         }
 637
 638         mcast = __ipoib_mcast_find(priv, mgid);
 639         if (!mcast) {
 640                 /* Let's create a new send only group now */
 641                 ipoib_dbg_mcast(priv, "setting up send only multicast group for %16D\n",
 642                                 mgid, ":");
 643
 644                 mcast = ipoib_mcast_alloc(priv, 0);
 645                 if (!mcast) {
 646                         ipoib_warn(priv, "unable to allocate memory for "
 647                                    "multicast structure\n");
 648                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 649                         m_freem(mb);
 650                         goto out;
 651                 }
 652
 653                 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
 654                 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
 655                 __ipoib_mcast_add(priv, mcast);
 656                 list_add_tail(&mcast->list, &priv->multicast_list);
 657         }
 658
 659         if (!mcast->ah) {
 660                 if (mcast->pkt_queue.ifq_len < IPOIB_MAX_MCAST_QUEUE) {
 661                         _IF_ENQUEUE(&mcast->pkt_queue, mb);
 662                 } else {
 663                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 664                         m_freem(mb);
 665                 }
 666
 667                 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
 668                         ipoib_dbg_mcast(priv, "no address vector, "
 669                                         "but multicast join already started\n");
 670                 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 671                         ipoib_mcast_sendonly_join(mcast);
 672
 673                 /*
 674                  * If lookup completes between here and out:, don't
 675                  * want to send packet twice.
 676                  */
 677                 mcast = NULL;
 678         }
 679
 680 out:
 681         if (mcast && mcast->ah)
 682                 ipoib_send(priv, mb, mcast->ah, IB_MULTICAST_QPN);
 683 }
 684
 685 void ipoib_mcast_dev_flush(struct ipoib_dev_priv *priv)
 686 {
 687         LIST_HEAD(remove_list);
 688         struct ipoib_mcast *mcast, *tmcast;
 689         unsigned long flags;
 690
 691         ipoib_dbg_mcast(priv, "flushing multicast list\n");
 692
 693         spin_lock_irqsave(&priv->lock, flags);
 694
 695         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 696                 list_del(&mcast->list);
 697                 rb_erase(&mcast->rb_node, &priv->multicast_tree);
 698                 list_add_tail(&mcast->list, &remove_list);
 699         }
 700
 701         if (priv->broadcast) {
 702                 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
 703                 list_add_tail(&priv->broadcast->list, &remove_list);
 704                 priv->broadcast = NULL;
 705         }
 706
 707         spin_unlock_irqrestore(&priv->lock, flags);
 708
 709         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 710                 ipoib_mcast_leave(priv, mcast);
 711                 ipoib_mcast_free(mcast);
 712         }
 713 }
 714
 715 static int ipoib_mcast_addr_is_valid(const u8 *addr, unsigned int addrlen,
 716                                      const u8 *broadcast)
 717 {
 718         if (addrlen != INFINIBAND_ALEN)
 719                 return 0;
 720         /* reserved QPN, prefix, scope */
 721         if (memcmp(addr, broadcast, 6))
 722                 return 0;
 723         /* signature lower, pkey */
 724         if (memcmp(addr + 7, broadcast + 7, 3))
 725                 return 0;
 726         return 1;
 727 }
 728
 729 void ipoib_mcast_restart_task(struct work_struct *work)
 730 {
 731         struct ipoib_dev_priv *priv =
 732                 container_of(work, struct ipoib_dev_priv, restart_task);
 733         ipoib_mcast_restart(priv);
 734 }
 735
 736 void ipoib_mcast_restart(struct ipoib_dev_priv *priv)
 737 {
 738         struct ifnet *dev = priv->dev;
 739         struct ifmultiaddr *ifma;
 740         struct ipoib_mcast *mcast, *tmcast;
 741         LIST_HEAD(remove_list);
 742         struct ib_sa_mcmember_rec rec;
 743         int addrlen;
 744
 745         ipoib_dbg_mcast(priv, "restarting multicast task flags 0x%lX\n",
 746             priv->flags);
 747
 748         ipoib_mcast_stop_thread(priv, 0);
 749
 750         if_maddr_rlock(dev);
 751         spin_lock(&priv->lock);
 752
 753         /*
 754          * Unfortunately, the networking core only gives us a list of all of
 755          * the multicast hardware addresses. We need to figure out which ones
 756          * are new and which ones have been removed
 757          */
 758
 759         /* Clear out the found flag */
 760         list_for_each_entry(mcast, &priv->multicast_list, list)
 761                 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 762
 763         /* Mark all of the entries that are found or don't exist */
 764
 765
 766         CK_STAILQ_FOREACH(ifma, &dev->if_multiaddrs, ifma_link) {
 767                 union ib_gid mgid;
 768                 uint8_t *addr;
 769
 770                 if (ifma->ifma_addr->sa_family != AF_LINK)
 771                         continue;
 772                 addr = LLADDR((struct sockaddr_dl *)ifma->ifma_addr);
 773                 addrlen = ((struct sockaddr_dl *)ifma->ifma_addr)->sdl_alen;
 774                 if (!ipoib_mcast_addr_is_valid(addr, addrlen,
 775                                                dev->if_broadcastaddr))
 776                         continue;
 777
 778                 memcpy(mgid.raw, addr + 4, sizeof mgid);
 779
 780                 mcast = __ipoib_mcast_find(priv, &mgid);
 781                 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 782                         struct ipoib_mcast *nmcast;
 783
 784                         /* ignore group which is directly joined by userspace */
 785                         if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
 786                             !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
 787                                 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %16D\n",
 788                                                 mgid.raw, ":");
 789                                 continue;
 790                         }
 791
 792                         /* Not found or send-only group, let's add a new entry */
 793                         ipoib_dbg_mcast(priv, "adding multicast entry for mgid %16D\n",
 794                                         mgid.raw, ":");
 795
 796                         nmcast = ipoib_mcast_alloc(priv, 0);
 797                         if (!nmcast) {
 798                                 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
 799                                 continue;
 800                         }
 801
 802                         set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
 803
 804                         nmcast->mcmember.mgid = mgid;
 805
 806                         if (mcast) {
 807                                 /* Destroy the send only entry */
 808                                 list_move_tail(&mcast->list, &remove_list);
 809
 810                                 rb_replace_node(&mcast->rb_node,
 811                                                 &nmcast->rb_node,
 812                                                 &priv->multicast_tree);
 813                         } else
 814                                 __ipoib_mcast_add(priv, nmcast);
 815
 816                         list_add_tail(&nmcast->list, &priv->multicast_list);
 817                 }
 818
 819                 if (mcast)
 820                         set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
 821         }
 822
 823         /* Remove all of the entries don't exist anymore */
 824         list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
 825                 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
 826                     !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
 827                         ipoib_dbg_mcast(priv, "deleting multicast group %16D\n",
 828                                         mcast->mcmember.mgid.raw, ":");
 829
 830                         rb_erase(&mcast->rb_node, &priv->multicast_tree);
 831
 832                         /* Move to the remove list */
 833                         list_move_tail(&mcast->list, &remove_list);
 834                 }
 835         }
 836
 837         spin_unlock(&priv->lock);
 838         if_maddr_runlock(dev);
 839
 840         /* We have to cancel outside of the spinlock */
 841         list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
 842                 ipoib_mcast_leave(mcast->priv, mcast);
 843                 ipoib_mcast_free(mcast);
 844         }
 845
 846         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 847                 ipoib_mcast_start_thread(priv);
 848 }
 849
 850 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 851
 852 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct ipoib_dev_priv *priv)
 853 {
 854         struct ipoib_mcast_iter *iter;
 855
 856         iter = kmalloc(sizeof *iter, GFP_KERNEL);
 857         if (!iter)
 858                 return NULL;
 859
 860         iter->priv = priv;
 861         memset(iter->mgid.raw, 0, 16);
 862
 863         if (ipoib_mcast_iter_next(iter)) {
 864                 kfree(iter);
 865                 return NULL;
 866         }
 867
 868         return iter;
 869 }
 870
 871 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
 872 {
 873         struct ipoib_dev_priv *priv = iter->priv;
 874         struct rb_node *n;
 875         struct ipoib_mcast *mcast;
 876         int ret = 1;
 877
 878         spin_lock_irq(&priv->lock);
 879
 880         n = rb_first(&priv->multicast_tree);
 881
 882         while (n) {
 883                 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
 884
 885                 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
 886                            sizeof (union ib_gid)) < 0) {
 887                         iter->mgid      = mcast->mcmember.mgid;
 888                         iter->created   = mcast->created;
 889                         iter->queuelen  = mcast->pkt_queue.ifq_len;
 890                         iter->complete  = !!mcast->ah;
 891                         iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
 892
 893                         ret = 0;
 894
 895                         break;
 896                 }
 897
 898                 n = rb_next(n);
 899         }
 900
 901         spin_unlock_irq(&priv->lock);
 902
 903         return ret;
 904 }
 905
 906 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
 907                            union ib_gid *mgid,
 908                            unsigned long *created,
 909                            unsigned int *queuelen,
 910                            unsigned int *complete,
 911                            unsigned int *send_only)
 912 {
 913         *mgid      = iter->mgid;
 914         *created   = iter->created;
 915         *queuelen  = iter->queuelen;
 916         *complete  = iter->complete;
 917         *send_only = iter->send_only;
 918 }
 919
 920 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */