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 35 #include <linux/skbuff.h> 36 #include <linux/rtnetlink.h> 37 #include <linux/ip.h> 38 #include <linux/in.h> 39 #include <linux/igmp.h> 40 #include <linux/inetdevice.h> 41 #include <linux/delay.h> 42 #include <linux/completion.h> 43 44 #include <net/dst.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 DEFINE_MUTEX(mcast_mutex); 57 58 struct ipoib_mcast_iter { 59 struct net_device *dev; 60 union ib_gid mgid; 61 unsigned long created; 62 unsigned int queuelen; 63 unsigned int complete; 64 unsigned int send_only; 65 }; 66 67 static void ipoib_mcast_free(struct ipoib_mcast *mcast) 68 { 69 struct net_device *dev = mcast->dev; 70 struct ipoib_dev_priv *priv = netdev_priv(dev); 71 struct ipoib_neigh *neigh, *tmp; 72 int tx_dropped = 0; 73 74 ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n", 75 mcast->mcmember.mgid.raw); 76 77 spin_lock_irq(&priv->lock); 78 79 list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) { 80 /* 81 * It's safe to call ipoib_put_ah() inside priv->lock 82 * here, because we know that mcast->ah will always 83 * hold one more reference, so ipoib_put_ah() will 84 * never do more than decrement the ref count. 85 */ 86 if (neigh->ah) 87 ipoib_put_ah(neigh->ah); 88 ipoib_neigh_free(dev, neigh); 89 } 90 91 spin_unlock_irq(&priv->lock); 92 93 if (mcast->ah) 94 ipoib_put_ah(mcast->ah); 95 96 while (!skb_queue_empty(&mcast->pkt_queue)) { 97 ++tx_dropped; 98 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 99 } 100 101 netif_tx_lock_bh(dev); 102 dev->stats.tx_dropped += tx_dropped; 103 netif_tx_unlock_bh(dev); 104 105 kfree(mcast); 106 } 107 108 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev, 109 int can_sleep) 110 { 111 struct ipoib_mcast *mcast; 112 113 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC); 114 if (!mcast) 115 return NULL; 116 117 mcast->dev = dev; 118 mcast->created = jiffies; 119 mcast->backoff = 1; 120 121 INIT_LIST_HEAD(&mcast->list); 122 INIT_LIST_HEAD(&mcast->neigh_list); 123 skb_queue_head_init(&mcast->pkt_queue); 124 125 return mcast; 126 } 127 128 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid) 129 { 130 struct ipoib_dev_priv *priv = netdev_priv(dev); 131 struct rb_node *n = priv->multicast_tree.rb_node; 132 133 while (n) { 134 struct ipoib_mcast *mcast; 135 int ret; 136 137 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 138 139 ret = memcmp(mgid, mcast->mcmember.mgid.raw, 140 sizeof (union ib_gid)); 141 if (ret < 0) 142 n = n->rb_left; 143 else if (ret > 0) 144 n = n->rb_right; 145 else 146 return mcast; 147 } 148 149 return NULL; 150 } 151 152 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast) 153 { 154 struct ipoib_dev_priv *priv = netdev_priv(dev); 155 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL; 156 157 while (*n) { 158 struct ipoib_mcast *tmcast; 159 int ret; 160 161 pn = *n; 162 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node); 163 164 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw, 165 sizeof (union ib_gid)); 166 if (ret < 0) 167 n = &pn->rb_left; 168 else if (ret > 0) 169 n = &pn->rb_right; 170 else 171 return -EEXIST; 172 } 173 174 rb_link_node(&mcast->rb_node, pn, n); 175 rb_insert_color(&mcast->rb_node, &priv->multicast_tree); 176 177 return 0; 178 } 179 180 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast, 181 struct ib_sa_mcmember_rec *mcmember) 182 { 183 struct net_device *dev = mcast->dev; 184 struct ipoib_dev_priv *priv = netdev_priv(dev); 185 struct ipoib_ah *ah; 186 int ret; 187 int set_qkey = 0; 188 189 mcast->mcmember = *mcmember; 190 191 /* Set the cached Q_Key before we attach if it's the broadcast group */ 192 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 193 sizeof (union ib_gid))) { 194 spin_lock_irq(&priv->lock); 195 if (!priv->broadcast) { 196 spin_unlock_irq(&priv->lock); 197 return -EAGAIN; 198 } 199 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey); 200 spin_unlock_irq(&priv->lock); 201 priv->tx_wr.wr.ud.remote_qkey = priv->qkey; 202 set_qkey = 1; 203 } 204 205 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 206 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 207 ipoib_warn(priv, "multicast group %pI6 already attached\n", 208 mcast->mcmember.mgid.raw); 209 210 return 0; 211 } 212 213 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid), 214 &mcast->mcmember.mgid, set_qkey); 215 if (ret < 0) { 216 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n", 217 mcast->mcmember.mgid.raw); 218 219 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags); 220 return ret; 221 } 222 } 223 224 { 225 struct ib_ah_attr av = { 226 .dlid = be16_to_cpu(mcast->mcmember.mlid), 227 .port_num = priv->port, 228 .sl = mcast->mcmember.sl, 229 .ah_flags = IB_AH_GRH, 230 .static_rate = mcast->mcmember.rate, 231 .grh = { 232 .flow_label = be32_to_cpu(mcast->mcmember.flow_label), 233 .hop_limit = mcast->mcmember.hop_limit, 234 .sgid_index = 0, 235 .traffic_class = mcast->mcmember.traffic_class 236 } 237 }; 238 av.grh.dgid = mcast->mcmember.mgid; 239 240 ah = ipoib_create_ah(dev, priv->pd, &av); 241 if (!ah) { 242 ipoib_warn(priv, "ib_address_create failed\n"); 243 } else { 244 spin_lock_irq(&priv->lock); 245 mcast->ah = ah; 246 spin_unlock_irq(&priv->lock); 247 248 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n", 249 mcast->mcmember.mgid.raw, 250 mcast->ah->ah, 251 be16_to_cpu(mcast->mcmember.mlid), 252 mcast->mcmember.sl); 253 } 254 } 255 256 /* actually send any queued packets */ 257 netif_tx_lock_bh(dev); 258 while (!skb_queue_empty(&mcast->pkt_queue)) { 259 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue); 260 netif_tx_unlock_bh(dev); 261 262 skb->dev = dev; 263 264 if (!skb->dst || !skb->dst->neighbour) { 265 /* put pseudoheader back on for next time */ 266 skb_push(skb, sizeof (struct ipoib_pseudoheader)); 267 } 268 269 if (dev_queue_xmit(skb)) 270 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n"); 271 netif_tx_lock_bh(dev); 272 } 273 netif_tx_unlock_bh(dev); 274 275 return 0; 276 } 277 278 static int 279 ipoib_mcast_sendonly_join_complete(int status, 280 struct ib_sa_multicast *multicast) 281 { 282 struct ipoib_mcast *mcast = multicast->context; 283 struct net_device *dev = mcast->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 %pI6, status %d\n", 295 mcast->mcmember.mgid.raw, status); 296 297 /* Flush out any queued packets */ 298 netif_tx_lock_bh(dev); 299 while (!skb_queue_empty(&mcast->pkt_queue)) { 300 ++dev->stats.tx_dropped; 301 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 302 } 303 netif_tx_unlock_bh(dev); 304 305 /* Clear the busy flag so we try again */ 306 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, 307 &mcast->flags); 308 } 309 return status; 310 } 311 312 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast) 313 { 314 struct net_device *dev = mcast->dev; 315 struct ipoib_dev_priv *priv = netdev_priv(dev); 316 struct ib_sa_mcmember_rec rec = { 317 #if 0 /* Some SMs don't support send-only yet */ 318 .join_state = 4 319 #else 320 .join_state = 1 321 #endif 322 }; 323 int ret = 0; 324 325 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 326 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n"); 327 return -ENODEV; 328 } 329 330 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) { 331 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n"); 332 return -EBUSY; 333 } 334 335 rec.mgid = mcast->mcmember.mgid; 336 rec.port_gid = priv->local_gid; 337 rec.pkey = cpu_to_be16(priv->pkey); 338 339 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, 340 priv->port, &rec, 341 IB_SA_MCMEMBER_REC_MGID | 342 IB_SA_MCMEMBER_REC_PORT_GID | 343 IB_SA_MCMEMBER_REC_PKEY | 344 IB_SA_MCMEMBER_REC_JOIN_STATE, 345 GFP_ATOMIC, 346 ipoib_mcast_sendonly_join_complete, 347 mcast); 348 if (IS_ERR(mcast->mc)) { 349 ret = PTR_ERR(mcast->mc); 350 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 351 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n", 352 ret); 353 } else { 354 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n", 355 mcast->mcmember.mgid.raw); 356 } 357 358 return ret; 359 } 360 361 void ipoib_mcast_carrier_on_task(struct work_struct *work) 362 { 363 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 364 carrier_on_task); 365 366 /* 367 * Take rtnl_lock to avoid racing with ipoib_stop() and 368 * turning the carrier back on while a device is being 369 * removed. 370 */ 371 rtnl_lock(); 372 netif_carrier_on(priv->dev); 373 rtnl_unlock(); 374 } 375 376 static int ipoib_mcast_join_complete(int status, 377 struct ib_sa_multicast *multicast) 378 { 379 struct ipoib_mcast *mcast = multicast->context; 380 struct net_device *dev = mcast->dev; 381 struct ipoib_dev_priv *priv = netdev_priv(dev); 382 383 ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n", 384 mcast->mcmember.mgid.raw, status); 385 386 /* We trap for port events ourselves. */ 387 if (status == -ENETRESET) 388 return 0; 389 390 if (!status) 391 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 392 393 if (!status) { 394 mcast->backoff = 1; 395 mutex_lock(&mcast_mutex); 396 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 397 queue_delayed_work(ipoib_workqueue, 398 &priv->mcast_task, 0); 399 mutex_unlock(&mcast_mutex); 400 401 /* 402 * Defer carrier on work to ipoib_workqueue to avoid a 403 * deadlock on rtnl_lock here. 404 */ 405 if (mcast == priv->broadcast) 406 queue_work(ipoib_workqueue, &priv->carrier_on_task); 407 408 return 0; 409 } 410 411 if (mcast->logcount++ < 20) { 412 if (status == -ETIMEDOUT || status == -EAGAIN) { 413 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n", 414 mcast->mcmember.mgid.raw, status); 415 } else { 416 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n", 417 mcast->mcmember.mgid.raw, status); 418 } 419 } 420 421 mcast->backoff *= 2; 422 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 423 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 424 425 /* Clear the busy flag so we try again */ 426 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 427 428 mutex_lock(&mcast_mutex); 429 spin_lock_irq(&priv->lock); 430 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 431 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 432 mcast->backoff * HZ); 433 spin_unlock_irq(&priv->lock); 434 mutex_unlock(&mcast_mutex); 435 436 return status; 437 } 438 439 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast, 440 int create) 441 { 442 struct ipoib_dev_priv *priv = netdev_priv(dev); 443 struct ib_sa_mcmember_rec rec = { 444 .join_state = 1 445 }; 446 ib_sa_comp_mask comp_mask; 447 int ret = 0; 448 449 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw); 450 451 rec.mgid = mcast->mcmember.mgid; 452 rec.port_gid = priv->local_gid; 453 rec.pkey = cpu_to_be16(priv->pkey); 454 455 comp_mask = 456 IB_SA_MCMEMBER_REC_MGID | 457 IB_SA_MCMEMBER_REC_PORT_GID | 458 IB_SA_MCMEMBER_REC_PKEY | 459 IB_SA_MCMEMBER_REC_JOIN_STATE; 460 461 if (create) { 462 comp_mask |= 463 IB_SA_MCMEMBER_REC_QKEY | 464 IB_SA_MCMEMBER_REC_MTU_SELECTOR | 465 IB_SA_MCMEMBER_REC_MTU | 466 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS | 467 IB_SA_MCMEMBER_REC_RATE_SELECTOR | 468 IB_SA_MCMEMBER_REC_RATE | 469 IB_SA_MCMEMBER_REC_SL | 470 IB_SA_MCMEMBER_REC_FLOW_LABEL | 471 IB_SA_MCMEMBER_REC_HOP_LIMIT; 472 473 rec.qkey = priv->broadcast->mcmember.qkey; 474 rec.mtu_selector = IB_SA_EQ; 475 rec.mtu = priv->broadcast->mcmember.mtu; 476 rec.traffic_class = priv->broadcast->mcmember.traffic_class; 477 rec.rate_selector = IB_SA_EQ; 478 rec.rate = priv->broadcast->mcmember.rate; 479 rec.sl = priv->broadcast->mcmember.sl; 480 rec.flow_label = priv->broadcast->mcmember.flow_label; 481 rec.hop_limit = priv->broadcast->mcmember.hop_limit; 482 } 483 484 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 485 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port, 486 &rec, comp_mask, GFP_KERNEL, 487 ipoib_mcast_join_complete, mcast); 488 if (IS_ERR(mcast->mc)) { 489 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 490 ret = PTR_ERR(mcast->mc); 491 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret); 492 493 mcast->backoff *= 2; 494 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 495 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 496 497 mutex_lock(&mcast_mutex); 498 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 499 queue_delayed_work(ipoib_workqueue, 500 &priv->mcast_task, 501 mcast->backoff * HZ); 502 mutex_unlock(&mcast_mutex); 503 } 504 } 505 506 void ipoib_mcast_join_task(struct work_struct *work) 507 { 508 struct ipoib_dev_priv *priv = 509 container_of(work, struct ipoib_dev_priv, mcast_task.work); 510 struct net_device *dev = priv->dev; 511 512 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags)) 513 return; 514 515 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid)) 516 ipoib_warn(priv, "ib_query_gid() failed\n"); 517 else 518 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 519 520 { 521 struct ib_port_attr attr; 522 523 if (!ib_query_port(priv->ca, priv->port, &attr)) 524 priv->local_lid = attr.lid; 525 else 526 ipoib_warn(priv, "ib_query_port failed\n"); 527 } 528 529 if (!priv->broadcast) { 530 struct ipoib_mcast *broadcast; 531 532 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 533 return; 534 535 broadcast = ipoib_mcast_alloc(dev, 1); 536 if (!broadcast) { 537 ipoib_warn(priv, "failed to allocate broadcast group\n"); 538 mutex_lock(&mcast_mutex); 539 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 540 queue_delayed_work(ipoib_workqueue, 541 &priv->mcast_task, HZ); 542 mutex_unlock(&mcast_mutex); 543 return; 544 } 545 546 spin_lock_irq(&priv->lock); 547 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 548 sizeof (union ib_gid)); 549 priv->broadcast = broadcast; 550 551 __ipoib_mcast_add(dev, priv->broadcast); 552 spin_unlock_irq(&priv->lock); 553 } 554 555 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 556 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) 557 ipoib_mcast_join(dev, priv->broadcast, 0); 558 return; 559 } 560 561 while (1) { 562 struct ipoib_mcast *mcast = NULL; 563 564 spin_lock_irq(&priv->lock); 565 list_for_each_entry(mcast, &priv->multicast_list, list) { 566 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) 567 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) 568 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 569 /* Found the next unjoined group */ 570 break; 571 } 572 } 573 spin_unlock_irq(&priv->lock); 574 575 if (&mcast->list == &priv->multicast_list) { 576 /* All done */ 577 break; 578 } 579 580 ipoib_mcast_join(dev, mcast, 1); 581 return; 582 } 583 584 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu)); 585 586 if (!ipoib_cm_admin_enabled(dev)) { 587 rtnl_lock(); 588 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu)); 589 rtnl_unlock(); 590 } 591 592 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n"); 593 594 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 595 } 596 597 int ipoib_mcast_start_thread(struct net_device *dev) 598 { 599 struct ipoib_dev_priv *priv = netdev_priv(dev); 600 601 ipoib_dbg_mcast(priv, "starting multicast thread\n"); 602 603 mutex_lock(&mcast_mutex); 604 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags)) 605 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0); 606 mutex_unlock(&mcast_mutex); 607 608 return 0; 609 } 610 611 int ipoib_mcast_stop_thread(struct net_device *dev, int flush) 612 { 613 struct ipoib_dev_priv *priv = netdev_priv(dev); 614 615 ipoib_dbg_mcast(priv, "stopping multicast thread\n"); 616 617 mutex_lock(&mcast_mutex); 618 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 619 cancel_delayed_work(&priv->mcast_task); 620 mutex_unlock(&mcast_mutex); 621 622 if (flush) 623 flush_workqueue(ipoib_workqueue); 624 625 return 0; 626 } 627 628 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast) 629 { 630 struct ipoib_dev_priv *priv = netdev_priv(dev); 631 int ret = 0; 632 633 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 634 ib_sa_free_multicast(mcast->mc); 635 636 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 637 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n", 638 mcast->mcmember.mgid.raw); 639 640 /* Remove ourselves from the multicast group */ 641 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid, 642 be16_to_cpu(mcast->mcmember.mlid)); 643 if (ret) 644 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret); 645 } 646 647 return 0; 648 } 649 650 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb) 651 { 652 struct ipoib_dev_priv *priv = netdev_priv(dev); 653 struct ipoib_mcast *mcast; 654 unsigned long flags; 655 656 spin_lock_irqsave(&priv->lock, flags); 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 %pI6\n", 670 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_irqrestore(&priv->lock, flags); 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_addr_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 %pI6\n", 804 mgid.raw); 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 %pI6\n", 810 mgid.raw); 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 %pI6\n", 844 mcast->mcmember.mgid.raw); 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_addr_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