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