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 <net/dst.h> 47 48 #include "ipoib.h" 49 50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 51 static int mcast_debug_level; 52 53 module_param(mcast_debug_level, int, 0644); 54 MODULE_PARM_DESC(mcast_debug_level, 55 "Enable multicast debug tracing if > 0"); 56 #endif 57 58 static DEFINE_MUTEX(mcast_mutex); 59 60 struct ipoib_mcast_iter { 61 struct net_device *dev; 62 union ib_gid mgid; 63 unsigned long created; 64 unsigned int queuelen; 65 unsigned int complete; 66 unsigned int send_only; 67 }; 68 69 static void ipoib_mcast_free(struct ipoib_mcast *mcast) 70 { 71 struct net_device *dev = mcast->dev; 72 struct ipoib_dev_priv *priv = netdev_priv(dev); 73 struct ipoib_neigh *neigh, *tmp; 74 unsigned long flags; 75 int tx_dropped = 0; 76 77 ipoib_dbg_mcast(netdev_priv(dev), 78 "deleting multicast group " IPOIB_GID_FMT "\n", 79 IPOIB_GID_ARG(mcast->mcmember.mgid)); 80 81 spin_lock_irqsave(&priv->lock, flags); 82 83 list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) { 84 /* 85 * It's safe to call ipoib_put_ah() inside priv->lock 86 * here, because we know that mcast->ah will always 87 * hold one more reference, so ipoib_put_ah() will 88 * never do more than decrement the ref count. 89 */ 90 if (neigh->ah) 91 ipoib_put_ah(neigh->ah); 92 ipoib_neigh_free(dev, neigh); 93 } 94 95 spin_unlock_irqrestore(&priv->lock, flags); 96 97 if (mcast->ah) 98 ipoib_put_ah(mcast->ah); 99 100 while (!skb_queue_empty(&mcast->pkt_queue)) { 101 ++tx_dropped; 102 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 103 } 104 105 spin_lock_irqsave(&priv->tx_lock, flags); 106 dev->stats.tx_dropped += tx_dropped; 107 spin_unlock_irqrestore(&priv->tx_lock, flags); 108 109 kfree(mcast); 110 } 111 112 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev, 113 int can_sleep) 114 { 115 struct ipoib_mcast *mcast; 116 117 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC); 118 if (!mcast) 119 return NULL; 120 121 mcast->dev = dev; 122 mcast->created = jiffies; 123 mcast->backoff = 1; 124 125 INIT_LIST_HEAD(&mcast->list); 126 INIT_LIST_HEAD(&mcast->neigh_list); 127 skb_queue_head_init(&mcast->pkt_queue); 128 129 return mcast; 130 } 131 132 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid) 133 { 134 struct ipoib_dev_priv *priv = netdev_priv(dev); 135 struct rb_node *n = priv->multicast_tree.rb_node; 136 137 while (n) { 138 struct ipoib_mcast *mcast; 139 int ret; 140 141 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 142 143 ret = memcmp(mgid, mcast->mcmember.mgid.raw, 144 sizeof (union ib_gid)); 145 if (ret < 0) 146 n = n->rb_left; 147 else if (ret > 0) 148 n = n->rb_right; 149 else 150 return mcast; 151 } 152 153 return NULL; 154 } 155 156 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast) 157 { 158 struct ipoib_dev_priv *priv = netdev_priv(dev); 159 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL; 160 161 while (*n) { 162 struct ipoib_mcast *tmcast; 163 int ret; 164 165 pn = *n; 166 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node); 167 168 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw, 169 sizeof (union ib_gid)); 170 if (ret < 0) 171 n = &pn->rb_left; 172 else if (ret > 0) 173 n = &pn->rb_right; 174 else 175 return -EEXIST; 176 } 177 178 rb_link_node(&mcast->rb_node, pn, n); 179 rb_insert_color(&mcast->rb_node, &priv->multicast_tree); 180 181 return 0; 182 } 183 184 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast, 185 struct ib_sa_mcmember_rec *mcmember) 186 { 187 struct net_device *dev = mcast->dev; 188 struct ipoib_dev_priv *priv = netdev_priv(dev); 189 struct ipoib_ah *ah; 190 int ret; 191 192 mcast->mcmember = *mcmember; 193 194 /* Set the cached Q_Key before we attach if it's the broadcast group */ 195 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 196 sizeof (union ib_gid))) { 197 spin_lock_irq(&priv->lock); 198 if (!priv->broadcast) { 199 spin_unlock_irq(&priv->lock); 200 return -EAGAIN; 201 } 202 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey); 203 spin_unlock_irq(&priv->lock); 204 priv->tx_wr.wr.ud.remote_qkey = priv->qkey; 205 } 206 207 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 208 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 209 ipoib_warn(priv, "multicast group " IPOIB_GID_FMT 210 " already attached\n", 211 IPOIB_GID_ARG(mcast->mcmember.mgid)); 212 213 return 0; 214 } 215 216 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid), 217 &mcast->mcmember.mgid); 218 if (ret < 0) { 219 ipoib_warn(priv, "couldn't attach QP to multicast group " 220 IPOIB_GID_FMT "\n", 221 IPOIB_GID_ARG(mcast->mcmember.mgid)); 222 223 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags); 224 return ret; 225 } 226 } 227 228 { 229 struct ib_ah_attr av = { 230 .dlid = be16_to_cpu(mcast->mcmember.mlid), 231 .port_num = priv->port, 232 .sl = mcast->mcmember.sl, 233 .ah_flags = IB_AH_GRH, 234 .static_rate = mcast->mcmember.rate, 235 .grh = { 236 .flow_label = be32_to_cpu(mcast->mcmember.flow_label), 237 .hop_limit = mcast->mcmember.hop_limit, 238 .sgid_index = 0, 239 .traffic_class = mcast->mcmember.traffic_class 240 } 241 }; 242 av.grh.dgid = mcast->mcmember.mgid; 243 244 ah = ipoib_create_ah(dev, priv->pd, &av); 245 if (!ah) { 246 ipoib_warn(priv, "ib_address_create failed\n"); 247 } else { 248 spin_lock_irq(&priv->lock); 249 mcast->ah = ah; 250 spin_unlock_irq(&priv->lock); 251 252 ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT 253 " AV %p, LID 0x%04x, SL %d\n", 254 IPOIB_GID_ARG(mcast->mcmember.mgid), 255 mcast->ah->ah, 256 be16_to_cpu(mcast->mcmember.mlid), 257 mcast->mcmember.sl); 258 } 259 } 260 261 /* actually send any queued packets */ 262 spin_lock_irq(&priv->tx_lock); 263 while (!skb_queue_empty(&mcast->pkt_queue)) { 264 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue); 265 spin_unlock_irq(&priv->tx_lock); 266 267 skb->dev = dev; 268 269 if (!skb->dst || !skb->dst->neighbour) { 270 /* put pseudoheader back on for next time */ 271 skb_push(skb, sizeof (struct ipoib_pseudoheader)); 272 } 273 274 if (dev_queue_xmit(skb)) 275 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n"); 276 spin_lock_irq(&priv->tx_lock); 277 } 278 spin_unlock_irq(&priv->tx_lock); 279 280 return 0; 281 } 282 283 static int 284 ipoib_mcast_sendonly_join_complete(int status, 285 struct ib_sa_multicast *multicast) 286 { 287 struct ipoib_mcast *mcast = multicast->context; 288 struct net_device *dev = mcast->dev; 289 struct ipoib_dev_priv *priv = netdev_priv(dev); 290 291 /* We trap for port events ourselves. */ 292 if (status == -ENETRESET) 293 return 0; 294 295 if (!status) 296 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 297 298 if (status) { 299 if (mcast->logcount++ < 20) 300 ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for " 301 IPOIB_GID_FMT ", status %d\n", 302 IPOIB_GID_ARG(mcast->mcmember.mgid), status); 303 304 /* Flush out any queued packets */ 305 spin_lock_irq(&priv->tx_lock); 306 while (!skb_queue_empty(&mcast->pkt_queue)) { 307 ++dev->stats.tx_dropped; 308 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 309 } 310 spin_unlock_irq(&priv->tx_lock); 311 312 /* Clear the busy flag so we try again */ 313 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, 314 &mcast->flags); 315 } 316 return status; 317 } 318 319 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast) 320 { 321 struct net_device *dev = mcast->dev; 322 struct ipoib_dev_priv *priv = netdev_priv(dev); 323 struct ib_sa_mcmember_rec rec = { 324 #if 0 /* Some SMs don't support send-only yet */ 325 .join_state = 4 326 #else 327 .join_state = 1 328 #endif 329 }; 330 int ret = 0; 331 332 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 333 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n"); 334 return -ENODEV; 335 } 336 337 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) { 338 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n"); 339 return -EBUSY; 340 } 341 342 rec.mgid = mcast->mcmember.mgid; 343 rec.port_gid = priv->local_gid; 344 rec.pkey = cpu_to_be16(priv->pkey); 345 346 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, 347 priv->port, &rec, 348 IB_SA_MCMEMBER_REC_MGID | 349 IB_SA_MCMEMBER_REC_PORT_GID | 350 IB_SA_MCMEMBER_REC_PKEY | 351 IB_SA_MCMEMBER_REC_JOIN_STATE, 352 GFP_ATOMIC, 353 ipoib_mcast_sendonly_join_complete, 354 mcast); 355 if (IS_ERR(mcast->mc)) { 356 ret = PTR_ERR(mcast->mc); 357 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 358 ipoib_warn(priv, "ib_sa_join_multicast 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 } 365 366 return ret; 367 } 368 369 static int ipoib_mcast_join_complete(int status, 370 struct ib_sa_multicast *multicast) 371 { 372 struct ipoib_mcast *mcast = multicast->context; 373 struct net_device *dev = mcast->dev; 374 struct ipoib_dev_priv *priv = netdev_priv(dev); 375 376 ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT 377 " (status %d)\n", 378 IPOIB_GID_ARG(mcast->mcmember.mgid), status); 379 380 /* We trap for port events ourselves. */ 381 if (status == -ENETRESET) 382 return 0; 383 384 if (!status) 385 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 386 387 if (!status) { 388 mcast->backoff = 1; 389 mutex_lock(&mcast_mutex); 390 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 391 queue_delayed_work(ipoib_workqueue, 392 &priv->mcast_task, 0); 393 mutex_unlock(&mcast_mutex); 394 395 if (mcast == priv->broadcast) 396 netif_carrier_on(dev); 397 398 return 0; 399 } 400 401 if (mcast->logcount++ < 20) { 402 if (status == -ETIMEDOUT) { 403 ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT 404 ", status %d\n", 405 IPOIB_GID_ARG(mcast->mcmember.mgid), 406 status); 407 } else { 408 ipoib_warn(priv, "multicast join failed for " 409 IPOIB_GID_FMT ", status %d\n", 410 IPOIB_GID_ARG(mcast->mcmember.mgid), 411 status); 412 } 413 } 414 415 mcast->backoff *= 2; 416 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 417 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 418 419 /* Clear the busy flag so we try again */ 420 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 421 422 mutex_lock(&mcast_mutex); 423 spin_lock_irq(&priv->lock); 424 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 425 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 426 mcast->backoff * HZ); 427 spin_unlock_irq(&priv->lock); 428 mutex_unlock(&mcast_mutex); 429 430 return status; 431 } 432 433 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast, 434 int create) 435 { 436 struct ipoib_dev_priv *priv = netdev_priv(dev); 437 struct ib_sa_mcmember_rec rec = { 438 .join_state = 1 439 }; 440 ib_sa_comp_mask comp_mask; 441 int ret = 0; 442 443 ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n", 444 IPOIB_GID_ARG(mcast->mcmember.mgid)); 445 446 rec.mgid = mcast->mcmember.mgid; 447 rec.port_gid = priv->local_gid; 448 rec.pkey = cpu_to_be16(priv->pkey); 449 450 comp_mask = 451 IB_SA_MCMEMBER_REC_MGID | 452 IB_SA_MCMEMBER_REC_PORT_GID | 453 IB_SA_MCMEMBER_REC_PKEY | 454 IB_SA_MCMEMBER_REC_JOIN_STATE; 455 456 if (create) { 457 comp_mask |= 458 IB_SA_MCMEMBER_REC_QKEY | 459 IB_SA_MCMEMBER_REC_MTU_SELECTOR | 460 IB_SA_MCMEMBER_REC_MTU | 461 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS | 462 IB_SA_MCMEMBER_REC_RATE_SELECTOR | 463 IB_SA_MCMEMBER_REC_RATE | 464 IB_SA_MCMEMBER_REC_SL | 465 IB_SA_MCMEMBER_REC_FLOW_LABEL | 466 IB_SA_MCMEMBER_REC_HOP_LIMIT; 467 468 rec.qkey = priv->broadcast->mcmember.qkey; 469 rec.mtu_selector = IB_SA_EQ; 470 rec.mtu = priv->broadcast->mcmember.mtu; 471 rec.traffic_class = priv->broadcast->mcmember.traffic_class; 472 rec.rate_selector = IB_SA_EQ; 473 rec.rate = priv->broadcast->mcmember.rate; 474 rec.sl = priv->broadcast->mcmember.sl; 475 rec.flow_label = priv->broadcast->mcmember.flow_label; 476 rec.hop_limit = priv->broadcast->mcmember.hop_limit; 477 } 478 479 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 480 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port, 481 &rec, comp_mask, GFP_KERNEL, 482 ipoib_mcast_join_complete, mcast); 483 if (IS_ERR(mcast->mc)) { 484 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 485 ret = PTR_ERR(mcast->mc); 486 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret); 487 488 mcast->backoff *= 2; 489 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 490 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 491 492 mutex_lock(&mcast_mutex); 493 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 494 queue_delayed_work(ipoib_workqueue, 495 &priv->mcast_task, 496 mcast->backoff * HZ); 497 mutex_unlock(&mcast_mutex); 498 } 499 } 500 501 void ipoib_mcast_join_task(struct work_struct *work) 502 { 503 struct ipoib_dev_priv *priv = 504 container_of(work, struct ipoib_dev_priv, mcast_task.work); 505 struct net_device *dev = priv->dev; 506 507 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags)) 508 return; 509 510 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid)) 511 ipoib_warn(priv, "ib_query_gid() failed\n"); 512 else 513 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 514 515 { 516 struct ib_port_attr attr; 517 518 if (!ib_query_port(priv->ca, priv->port, &attr)) 519 priv->local_lid = attr.lid; 520 else 521 ipoib_warn(priv, "ib_query_port failed\n"); 522 } 523 524 if (!priv->broadcast) { 525 struct ipoib_mcast *broadcast; 526 527 broadcast = ipoib_mcast_alloc(dev, 1); 528 if (!broadcast) { 529 ipoib_warn(priv, "failed to allocate broadcast group\n"); 530 mutex_lock(&mcast_mutex); 531 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 532 queue_delayed_work(ipoib_workqueue, 533 &priv->mcast_task, HZ); 534 mutex_unlock(&mcast_mutex); 535 return; 536 } 537 538 spin_lock_irq(&priv->lock); 539 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 540 sizeof (union ib_gid)); 541 priv->broadcast = broadcast; 542 543 __ipoib_mcast_add(dev, priv->broadcast); 544 spin_unlock_irq(&priv->lock); 545 } 546 547 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 548 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) 549 ipoib_mcast_join(dev, priv->broadcast, 0); 550 return; 551 } 552 553 while (1) { 554 struct ipoib_mcast *mcast = NULL; 555 556 spin_lock_irq(&priv->lock); 557 list_for_each_entry(mcast, &priv->multicast_list, list) { 558 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) 559 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) 560 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 561 /* Found the next unjoined group */ 562 break; 563 } 564 } 565 spin_unlock_irq(&priv->lock); 566 567 if (&mcast->list == &priv->multicast_list) { 568 /* All done */ 569 break; 570 } 571 572 ipoib_mcast_join(dev, mcast, 1); 573 return; 574 } 575 576 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu)); 577 578 if (!ipoib_cm_admin_enabled(dev)) 579 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu); 580 581 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n"); 582 583 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 584 } 585 586 int ipoib_mcast_start_thread(struct net_device *dev) 587 { 588 struct ipoib_dev_priv *priv = netdev_priv(dev); 589 590 ipoib_dbg_mcast(priv, "starting multicast thread\n"); 591 592 mutex_lock(&mcast_mutex); 593 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags)) 594 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0); 595 mutex_unlock(&mcast_mutex); 596 597 spin_lock_irq(&priv->lock); 598 set_bit(IPOIB_MCAST_STARTED, &priv->flags); 599 spin_unlock_irq(&priv->lock); 600 601 return 0; 602 } 603 604 int ipoib_mcast_stop_thread(struct net_device *dev, int flush) 605 { 606 struct ipoib_dev_priv *priv = netdev_priv(dev); 607 608 ipoib_dbg_mcast(priv, "stopping multicast thread\n"); 609 610 spin_lock_irq(&priv->lock); 611 clear_bit(IPOIB_MCAST_STARTED, &priv->flags); 612 spin_unlock_irq(&priv->lock); 613 614 mutex_lock(&mcast_mutex); 615 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 616 cancel_delayed_work(&priv->mcast_task); 617 mutex_unlock(&mcast_mutex); 618 619 if (flush) 620 flush_workqueue(ipoib_workqueue); 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 int ret = 0; 629 630 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 631 ib_sa_free_multicast(mcast->mc); 632 633 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 634 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n", 635 IPOIB_GID_ARG(mcast->mcmember.mgid)); 636 637 /* Remove ourselves from the multicast group */ 638 ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid), 639 &mcast->mcmember.mgid); 640 if (ret) 641 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret); 642 } 643 644 return 0; 645 } 646 647 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb) 648 { 649 struct ipoib_dev_priv *priv = netdev_priv(dev); 650 struct ipoib_mcast *mcast; 651 652 /* 653 * We can only be called from ipoib_start_xmit, so we're 654 * inside tx_lock -- no need to save/restore flags. 655 */ 656 spin_lock(&priv->lock); 657 658 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) || 659 !priv->broadcast || 660 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 661 ++dev->stats.tx_dropped; 662 dev_kfree_skb_any(skb); 663 goto unlock; 664 } 665 666 mcast = __ipoib_mcast_find(dev, mgid); 667 if (!mcast) { 668 /* Let's create a new send only group now */ 669 ipoib_dbg_mcast(priv, "setting up send only multicast group for " 670 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid)); 671 672 mcast = ipoib_mcast_alloc(dev, 0); 673 if (!mcast) { 674 ipoib_warn(priv, "unable to allocate memory for " 675 "multicast structure\n"); 676 ++dev->stats.tx_dropped; 677 dev_kfree_skb_any(skb); 678 goto out; 679 } 680 681 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags); 682 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid)); 683 __ipoib_mcast_add(dev, mcast); 684 list_add_tail(&mcast->list, &priv->multicast_list); 685 } 686 687 if (!mcast->ah) { 688 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) 689 skb_queue_tail(&mcast->pkt_queue, skb); 690 else { 691 ++dev->stats.tx_dropped; 692 dev_kfree_skb_any(skb); 693 } 694 695 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 696 ipoib_dbg_mcast(priv, "no address vector, " 697 "but multicast join already started\n"); 698 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) 699 ipoib_mcast_sendonly_join(mcast); 700 701 /* 702 * If lookup completes between here and out:, don't 703 * want to send packet twice. 704 */ 705 mcast = NULL; 706 } 707 708 out: 709 if (mcast && mcast->ah) { 710 if (skb->dst && 711 skb->dst->neighbour && 712 !*to_ipoib_neigh(skb->dst->neighbour)) { 713 struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour, 714 skb->dev); 715 716 if (neigh) { 717 kref_get(&mcast->ah->ref); 718 neigh->ah = mcast->ah; 719 list_add_tail(&neigh->list, &mcast->neigh_list); 720 } 721 } 722 723 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN); 724 } 725 726 unlock: 727 spin_unlock(&priv->lock); 728 } 729 730 void ipoib_mcast_dev_flush(struct net_device *dev) 731 { 732 struct ipoib_dev_priv *priv = netdev_priv(dev); 733 LIST_HEAD(remove_list); 734 struct ipoib_mcast *mcast, *tmcast; 735 unsigned long flags; 736 737 ipoib_dbg_mcast(priv, "flushing multicast list\n"); 738 739 spin_lock_irqsave(&priv->lock, flags); 740 741 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 742 list_del(&mcast->list); 743 rb_erase(&mcast->rb_node, &priv->multicast_tree); 744 list_add_tail(&mcast->list, &remove_list); 745 } 746 747 if (priv->broadcast) { 748 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree); 749 list_add_tail(&priv->broadcast->list, &remove_list); 750 priv->broadcast = NULL; 751 } 752 753 spin_unlock_irqrestore(&priv->lock, flags); 754 755 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 756 ipoib_mcast_leave(dev, mcast); 757 ipoib_mcast_free(mcast); 758 } 759 } 760 761 void ipoib_mcast_restart_task(struct work_struct *work) 762 { 763 struct ipoib_dev_priv *priv = 764 container_of(work, struct ipoib_dev_priv, restart_task); 765 struct net_device *dev = priv->dev; 766 struct dev_mc_list *mclist; 767 struct ipoib_mcast *mcast, *tmcast; 768 LIST_HEAD(remove_list); 769 unsigned long flags; 770 struct ib_sa_mcmember_rec rec; 771 772 ipoib_dbg_mcast(priv, "restarting multicast task\n"); 773 774 ipoib_mcast_stop_thread(dev, 0); 775 776 local_irq_save(flags); 777 netif_tx_lock(dev); 778 spin_lock(&priv->lock); 779 780 /* 781 * Unfortunately, the networking core only gives us a list of all of 782 * the multicast hardware addresses. We need to figure out which ones 783 * are new and which ones have been removed 784 */ 785 786 /* Clear out the found flag */ 787 list_for_each_entry(mcast, &priv->multicast_list, list) 788 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 789 790 /* Mark all of the entries that are found or don't exist */ 791 for (mclist = dev->mc_list; mclist; mclist = mclist->next) { 792 union ib_gid mgid; 793 794 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid); 795 796 mcast = __ipoib_mcast_find(dev, &mgid); 797 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 798 struct ipoib_mcast *nmcast; 799 800 /* ignore group which is directly joined by userspace */ 801 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) && 802 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) { 803 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid " 804 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid)); 805 continue; 806 } 807 808 /* Not found or send-only group, let's add a new entry */ 809 ipoib_dbg_mcast(priv, "adding multicast entry for mgid " 810 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid)); 811 812 nmcast = ipoib_mcast_alloc(dev, 0); 813 if (!nmcast) { 814 ipoib_warn(priv, "unable to allocate memory for multicast structure\n"); 815 continue; 816 } 817 818 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags); 819 820 nmcast->mcmember.mgid = mgid; 821 822 if (mcast) { 823 /* Destroy the send only entry */ 824 list_move_tail(&mcast->list, &remove_list); 825 826 rb_replace_node(&mcast->rb_node, 827 &nmcast->rb_node, 828 &priv->multicast_tree); 829 } else 830 __ipoib_mcast_add(dev, nmcast); 831 832 list_add_tail(&nmcast->list, &priv->multicast_list); 833 } 834 835 if (mcast) 836 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 837 } 838 839 /* Remove all of the entries don't exist anymore */ 840 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 841 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) && 842 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 843 ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n", 844 IPOIB_GID_ARG(mcast->mcmember.mgid)); 845 846 rb_erase(&mcast->rb_node, &priv->multicast_tree); 847 848 /* Move to the remove list */ 849 list_move_tail(&mcast->list, &remove_list); 850 } 851 } 852 853 spin_unlock(&priv->lock); 854 netif_tx_unlock(dev); 855 local_irq_restore(flags); 856 857 /* We have to cancel outside of the spinlock */ 858 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 859 ipoib_mcast_leave(mcast->dev, mcast); 860 ipoib_mcast_free(mcast); 861 } 862 863 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 864 ipoib_mcast_start_thread(dev); 865 } 866 867 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 868 869 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev) 870 { 871 struct ipoib_mcast_iter *iter; 872 873 iter = kmalloc(sizeof *iter, GFP_KERNEL); 874 if (!iter) 875 return NULL; 876 877 iter->dev = dev; 878 memset(iter->mgid.raw, 0, 16); 879 880 if (ipoib_mcast_iter_next(iter)) { 881 kfree(iter); 882 return NULL; 883 } 884 885 return iter; 886 } 887 888 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter) 889 { 890 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 891 struct rb_node *n; 892 struct ipoib_mcast *mcast; 893 int ret = 1; 894 895 spin_lock_irq(&priv->lock); 896 897 n = rb_first(&priv->multicast_tree); 898 899 while (n) { 900 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 901 902 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw, 903 sizeof (union ib_gid)) < 0) { 904 iter->mgid = mcast->mcmember.mgid; 905 iter->created = mcast->created; 906 iter->queuelen = skb_queue_len(&mcast->pkt_queue); 907 iter->complete = !!mcast->ah; 908 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY)); 909 910 ret = 0; 911 912 break; 913 } 914 915 n = rb_next(n); 916 } 917 918 spin_unlock_irq(&priv->lock); 919 920 return ret; 921 } 922 923 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter, 924 union ib_gid *mgid, 925 unsigned long *created, 926 unsigned int *queuelen, 927 unsigned int *complete, 928 unsigned int *send_only) 929 { 930 *mgid = iter->mgid; 931 *created = iter->created; 932 *queuelen = iter->queuelen; 933 *complete = iter->complete; 934 *send_only = iter->send_only; 935 } 936 937 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 938