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/moduleparam.h> 38 #include <linux/ip.h> 39 #include <linux/in.h> 40 #include <linux/igmp.h> 41 #include <linux/inetdevice.h> 42 #include <linux/delay.h> 43 #include <linux/completion.h> 44 #include <linux/slab.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 int tx_dropped = 0; 75 76 ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n", 77 mcast->mcmember.mgid.raw); 78 79 spin_lock_irq(&priv->lock); 80 81 list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) { 82 /* 83 * It's safe to call ipoib_put_ah() inside priv->lock 84 * here, because we know that mcast->ah will always 85 * hold one more reference, so ipoib_put_ah() will 86 * never do more than decrement the ref count. 87 */ 88 if (neigh->ah) 89 ipoib_put_ah(neigh->ah); 90 ipoib_neigh_free(dev, neigh); 91 } 92 93 spin_unlock_irq(&priv->lock); 94 95 if (mcast->ah) 96 ipoib_put_ah(mcast->ah); 97 98 while (!skb_queue_empty(&mcast->pkt_queue)) { 99 ++tx_dropped; 100 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 101 } 102 103 netif_tx_lock_bh(dev); 104 dev->stats.tx_dropped += tx_dropped; 105 netif_tx_unlock_bh(dev); 106 107 kfree(mcast); 108 } 109 110 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev, 111 int can_sleep) 112 { 113 struct ipoib_mcast *mcast; 114 115 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC); 116 if (!mcast) 117 return NULL; 118 119 mcast->dev = dev; 120 mcast->created = jiffies; 121 mcast->backoff = 1; 122 123 INIT_LIST_HEAD(&mcast->list); 124 INIT_LIST_HEAD(&mcast->neigh_list); 125 skb_queue_head_init(&mcast->pkt_queue); 126 127 return mcast; 128 } 129 130 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid) 131 { 132 struct ipoib_dev_priv *priv = netdev_priv(dev); 133 struct rb_node *n = priv->multicast_tree.rb_node; 134 135 while (n) { 136 struct ipoib_mcast *mcast; 137 int ret; 138 139 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 140 141 ret = memcmp(mgid, mcast->mcmember.mgid.raw, 142 sizeof (union ib_gid)); 143 if (ret < 0) 144 n = n->rb_left; 145 else if (ret > 0) 146 n = n->rb_right; 147 else 148 return mcast; 149 } 150 151 return NULL; 152 } 153 154 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast) 155 { 156 struct ipoib_dev_priv *priv = netdev_priv(dev); 157 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL; 158 159 while (*n) { 160 struct ipoib_mcast *tmcast; 161 int ret; 162 163 pn = *n; 164 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node); 165 166 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw, 167 sizeof (union ib_gid)); 168 if (ret < 0) 169 n = &pn->rb_left; 170 else if (ret > 0) 171 n = &pn->rb_right; 172 else 173 return -EEXIST; 174 } 175 176 rb_link_node(&mcast->rb_node, pn, n); 177 rb_insert_color(&mcast->rb_node, &priv->multicast_tree); 178 179 return 0; 180 } 181 182 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast, 183 struct ib_sa_mcmember_rec *mcmember) 184 { 185 struct net_device *dev = mcast->dev; 186 struct ipoib_dev_priv *priv = netdev_priv(dev); 187 struct ipoib_ah *ah; 188 int ret; 189 int set_qkey = 0; 190 191 mcast->mcmember = *mcmember; 192 193 /* Set the cached Q_Key before we attach if it's the broadcast group */ 194 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 195 sizeof (union ib_gid))) { 196 spin_lock_irq(&priv->lock); 197 if (!priv->broadcast) { 198 spin_unlock_irq(&priv->lock); 199 return -EAGAIN; 200 } 201 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey); 202 spin_unlock_irq(&priv->lock); 203 priv->tx_wr.wr.ud.remote_qkey = priv->qkey; 204 set_qkey = 1; 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 %pI6 already attached\n", 210 mcast->mcmember.mgid.raw); 211 212 return 0; 213 } 214 215 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid), 216 &mcast->mcmember.mgid, set_qkey); 217 if (ret < 0) { 218 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n", 219 mcast->mcmember.mgid.raw); 220 221 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags); 222 return ret; 223 } 224 } 225 226 { 227 struct ib_ah_attr av = { 228 .dlid = be16_to_cpu(mcast->mcmember.mlid), 229 .port_num = priv->port, 230 .sl = mcast->mcmember.sl, 231 .ah_flags = IB_AH_GRH, 232 .static_rate = mcast->mcmember.rate, 233 .grh = { 234 .flow_label = be32_to_cpu(mcast->mcmember.flow_label), 235 .hop_limit = mcast->mcmember.hop_limit, 236 .sgid_index = 0, 237 .traffic_class = mcast->mcmember.traffic_class 238 } 239 }; 240 av.grh.dgid = mcast->mcmember.mgid; 241 242 ah = ipoib_create_ah(dev, priv->pd, &av); 243 if (IS_ERR(ah)) { 244 ipoib_warn(priv, "ib_address_create failed %ld\n", 245 -PTR_ERR(ah)); 246 /* use original error */ 247 return PTR_ERR(ah); 248 } else { 249 spin_lock_irq(&priv->lock); 250 mcast->ah = ah; 251 spin_unlock_irq(&priv->lock); 252 253 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n", 254 mcast->mcmember.mgid.raw, 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 netif_tx_lock_bh(dev); 263 while (!skb_queue_empty(&mcast->pkt_queue)) { 264 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue); 265 struct dst_entry *dst = skb_dst(skb); 266 struct neighbour *n = NULL; 267 268 netif_tx_unlock_bh(dev); 269 270 skb->dev = dev; 271 if (dst) 272 n = dst_get_neighbour_noref_raw(dst); 273 if (!dst || !n) { 274 /* put pseudoheader back on for next time */ 275 skb_push(skb, sizeof (struct ipoib_pseudoheader)); 276 } 277 278 if (dev_queue_xmit(skb)) 279 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n"); 280 netif_tx_lock_bh(dev); 281 } 282 netif_tx_unlock_bh(dev); 283 284 return 0; 285 } 286 287 static int 288 ipoib_mcast_sendonly_join_complete(int status, 289 struct ib_sa_multicast *multicast) 290 { 291 struct ipoib_mcast *mcast = multicast->context; 292 struct net_device *dev = mcast->dev; 293 294 /* We trap for port events ourselves. */ 295 if (status == -ENETRESET) 296 return 0; 297 298 if (!status) 299 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 300 301 if (status) { 302 if (mcast->logcount++ < 20) 303 ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for %pI6, status %d\n", 304 mcast->mcmember.mgid.raw, status); 305 306 /* Flush out any queued packets */ 307 netif_tx_lock_bh(dev); 308 while (!skb_queue_empty(&mcast->pkt_queue)) { 309 ++dev->stats.tx_dropped; 310 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 311 } 312 netif_tx_unlock_bh(dev); 313 314 /* Clear the busy flag so we try again */ 315 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, 316 &mcast->flags); 317 } 318 return status; 319 } 320 321 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast) 322 { 323 struct net_device *dev = mcast->dev; 324 struct ipoib_dev_priv *priv = netdev_priv(dev); 325 struct ib_sa_mcmember_rec rec = { 326 #if 0 /* Some SMs don't support send-only yet */ 327 .join_state = 4 328 #else 329 .join_state = 1 330 #endif 331 }; 332 int ret = 0; 333 334 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 335 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n"); 336 return -ENODEV; 337 } 338 339 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) { 340 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n"); 341 return -EBUSY; 342 } 343 344 rec.mgid = mcast->mcmember.mgid; 345 rec.port_gid = priv->local_gid; 346 rec.pkey = cpu_to_be16(priv->pkey); 347 348 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, 349 priv->port, &rec, 350 IB_SA_MCMEMBER_REC_MGID | 351 IB_SA_MCMEMBER_REC_PORT_GID | 352 IB_SA_MCMEMBER_REC_PKEY | 353 IB_SA_MCMEMBER_REC_JOIN_STATE, 354 GFP_ATOMIC, 355 ipoib_mcast_sendonly_join_complete, 356 mcast); 357 if (IS_ERR(mcast->mc)) { 358 ret = PTR_ERR(mcast->mc); 359 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 360 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n", 361 ret); 362 } else { 363 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n", 364 mcast->mcmember.mgid.raw); 365 } 366 367 return ret; 368 } 369 370 void ipoib_mcast_carrier_on_task(struct work_struct *work) 371 { 372 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 373 carrier_on_task); 374 struct ib_port_attr attr; 375 376 /* 377 * Take rtnl_lock to avoid racing with ipoib_stop() and 378 * turning the carrier back on while a device is being 379 * removed. 380 */ 381 if (ib_query_port(priv->ca, priv->port, &attr) || 382 attr.state != IB_PORT_ACTIVE) { 383 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n"); 384 return; 385 } 386 387 rtnl_lock(); 388 netif_carrier_on(priv->dev); 389 rtnl_unlock(); 390 } 391 392 static int ipoib_mcast_join_complete(int status, 393 struct ib_sa_multicast *multicast) 394 { 395 struct ipoib_mcast *mcast = multicast->context; 396 struct net_device *dev = mcast->dev; 397 struct ipoib_dev_priv *priv = netdev_priv(dev); 398 399 ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n", 400 mcast->mcmember.mgid.raw, status); 401 402 /* We trap for port events ourselves. */ 403 if (status == -ENETRESET) 404 return 0; 405 406 if (!status) 407 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 408 409 if (!status) { 410 mcast->backoff = 1; 411 mutex_lock(&mcast_mutex); 412 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 413 queue_delayed_work(ipoib_workqueue, 414 &priv->mcast_task, 0); 415 mutex_unlock(&mcast_mutex); 416 417 /* 418 * Defer carrier on work to ipoib_workqueue to avoid a 419 * deadlock on rtnl_lock here. 420 */ 421 if (mcast == priv->broadcast) 422 queue_work(ipoib_workqueue, &priv->carrier_on_task); 423 424 return 0; 425 } 426 427 if (mcast->logcount++ < 20) { 428 if (status == -ETIMEDOUT || status == -EAGAIN) { 429 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n", 430 mcast->mcmember.mgid.raw, status); 431 } else { 432 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n", 433 mcast->mcmember.mgid.raw, status); 434 } 435 } 436 437 mcast->backoff *= 2; 438 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 439 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 440 441 /* Clear the busy flag so we try again */ 442 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 443 444 mutex_lock(&mcast_mutex); 445 spin_lock_irq(&priv->lock); 446 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 447 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 448 mcast->backoff * HZ); 449 spin_unlock_irq(&priv->lock); 450 mutex_unlock(&mcast_mutex); 451 452 return status; 453 } 454 455 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast, 456 int create) 457 { 458 struct ipoib_dev_priv *priv = netdev_priv(dev); 459 struct ib_sa_mcmember_rec rec = { 460 .join_state = 1 461 }; 462 ib_sa_comp_mask comp_mask; 463 int ret = 0; 464 465 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw); 466 467 rec.mgid = mcast->mcmember.mgid; 468 rec.port_gid = priv->local_gid; 469 rec.pkey = cpu_to_be16(priv->pkey); 470 471 comp_mask = 472 IB_SA_MCMEMBER_REC_MGID | 473 IB_SA_MCMEMBER_REC_PORT_GID | 474 IB_SA_MCMEMBER_REC_PKEY | 475 IB_SA_MCMEMBER_REC_JOIN_STATE; 476 477 if (create) { 478 comp_mask |= 479 IB_SA_MCMEMBER_REC_QKEY | 480 IB_SA_MCMEMBER_REC_MTU_SELECTOR | 481 IB_SA_MCMEMBER_REC_MTU | 482 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS | 483 IB_SA_MCMEMBER_REC_RATE_SELECTOR | 484 IB_SA_MCMEMBER_REC_RATE | 485 IB_SA_MCMEMBER_REC_SL | 486 IB_SA_MCMEMBER_REC_FLOW_LABEL | 487 IB_SA_MCMEMBER_REC_HOP_LIMIT; 488 489 rec.qkey = priv->broadcast->mcmember.qkey; 490 rec.mtu_selector = IB_SA_EQ; 491 rec.mtu = priv->broadcast->mcmember.mtu; 492 rec.traffic_class = priv->broadcast->mcmember.traffic_class; 493 rec.rate_selector = IB_SA_EQ; 494 rec.rate = priv->broadcast->mcmember.rate; 495 rec.sl = priv->broadcast->mcmember.sl; 496 rec.flow_label = priv->broadcast->mcmember.flow_label; 497 rec.hop_limit = priv->broadcast->mcmember.hop_limit; 498 } 499 500 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 501 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port, 502 &rec, comp_mask, GFP_KERNEL, 503 ipoib_mcast_join_complete, mcast); 504 if (IS_ERR(mcast->mc)) { 505 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 506 ret = PTR_ERR(mcast->mc); 507 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret); 508 509 mcast->backoff *= 2; 510 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 511 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 512 513 mutex_lock(&mcast_mutex); 514 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 515 queue_delayed_work(ipoib_workqueue, 516 &priv->mcast_task, 517 mcast->backoff * HZ); 518 mutex_unlock(&mcast_mutex); 519 } 520 } 521 522 void ipoib_mcast_join_task(struct work_struct *work) 523 { 524 struct ipoib_dev_priv *priv = 525 container_of(work, struct ipoib_dev_priv, mcast_task.work); 526 struct net_device *dev = priv->dev; 527 528 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags)) 529 return; 530 531 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid)) 532 ipoib_warn(priv, "ib_query_gid() failed\n"); 533 else 534 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 535 536 { 537 struct ib_port_attr attr; 538 539 if (!ib_query_port(priv->ca, priv->port, &attr)) 540 priv->local_lid = attr.lid; 541 else 542 ipoib_warn(priv, "ib_query_port failed\n"); 543 } 544 545 if (!priv->broadcast) { 546 struct ipoib_mcast *broadcast; 547 548 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 549 return; 550 551 broadcast = ipoib_mcast_alloc(dev, 1); 552 if (!broadcast) { 553 ipoib_warn(priv, "failed to allocate broadcast group\n"); 554 mutex_lock(&mcast_mutex); 555 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 556 queue_delayed_work(ipoib_workqueue, 557 &priv->mcast_task, HZ); 558 mutex_unlock(&mcast_mutex); 559 return; 560 } 561 562 spin_lock_irq(&priv->lock); 563 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 564 sizeof (union ib_gid)); 565 priv->broadcast = broadcast; 566 567 __ipoib_mcast_add(dev, priv->broadcast); 568 spin_unlock_irq(&priv->lock); 569 } 570 571 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 572 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) 573 ipoib_mcast_join(dev, priv->broadcast, 0); 574 return; 575 } 576 577 while (1) { 578 struct ipoib_mcast *mcast = NULL; 579 580 spin_lock_irq(&priv->lock); 581 list_for_each_entry(mcast, &priv->multicast_list, list) { 582 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) 583 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) 584 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 585 /* Found the next unjoined group */ 586 break; 587 } 588 } 589 spin_unlock_irq(&priv->lock); 590 591 if (&mcast->list == &priv->multicast_list) { 592 /* All done */ 593 break; 594 } 595 596 ipoib_mcast_join(dev, mcast, 1); 597 return; 598 } 599 600 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu)); 601 602 if (!ipoib_cm_admin_enabled(dev)) { 603 rtnl_lock(); 604 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu)); 605 rtnl_unlock(); 606 } 607 608 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n"); 609 610 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 611 } 612 613 int ipoib_mcast_start_thread(struct net_device *dev) 614 { 615 struct ipoib_dev_priv *priv = netdev_priv(dev); 616 617 ipoib_dbg_mcast(priv, "starting multicast thread\n"); 618 619 mutex_lock(&mcast_mutex); 620 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags)) 621 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0); 622 mutex_unlock(&mcast_mutex); 623 624 return 0; 625 } 626 627 int ipoib_mcast_stop_thread(struct net_device *dev, int flush) 628 { 629 struct ipoib_dev_priv *priv = netdev_priv(dev); 630 631 ipoib_dbg_mcast(priv, "stopping multicast thread\n"); 632 633 mutex_lock(&mcast_mutex); 634 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 635 cancel_delayed_work(&priv->mcast_task); 636 mutex_unlock(&mcast_mutex); 637 638 if (flush) 639 flush_workqueue(ipoib_workqueue); 640 641 return 0; 642 } 643 644 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast) 645 { 646 struct ipoib_dev_priv *priv = netdev_priv(dev); 647 int ret = 0; 648 649 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 650 ib_sa_free_multicast(mcast->mc); 651 652 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 653 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n", 654 mcast->mcmember.mgid.raw); 655 656 /* Remove ourselves from the multicast group */ 657 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid, 658 be16_to_cpu(mcast->mcmember.mlid)); 659 if (ret) 660 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret); 661 } 662 663 return 0; 664 } 665 666 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb) 667 { 668 struct ipoib_dev_priv *priv = netdev_priv(dev); 669 struct ipoib_mcast *mcast; 670 unsigned long flags; 671 672 spin_lock_irqsave(&priv->lock, flags); 673 674 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) || 675 !priv->broadcast || 676 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 677 ++dev->stats.tx_dropped; 678 dev_kfree_skb_any(skb); 679 goto unlock; 680 } 681 682 mcast = __ipoib_mcast_find(dev, mgid); 683 if (!mcast) { 684 /* Let's create a new send only group now */ 685 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n", 686 mgid); 687 688 mcast = ipoib_mcast_alloc(dev, 0); 689 if (!mcast) { 690 ipoib_warn(priv, "unable to allocate memory for " 691 "multicast structure\n"); 692 ++dev->stats.tx_dropped; 693 dev_kfree_skb_any(skb); 694 goto out; 695 } 696 697 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags); 698 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid)); 699 __ipoib_mcast_add(dev, mcast); 700 list_add_tail(&mcast->list, &priv->multicast_list); 701 } 702 703 if (!mcast->ah) { 704 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) 705 skb_queue_tail(&mcast->pkt_queue, skb); 706 else { 707 ++dev->stats.tx_dropped; 708 dev_kfree_skb_any(skb); 709 } 710 711 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 712 ipoib_dbg_mcast(priv, "no address vector, " 713 "but multicast join already started\n"); 714 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) 715 ipoib_mcast_sendonly_join(mcast); 716 717 /* 718 * If lookup completes between here and out:, don't 719 * want to send packet twice. 720 */ 721 mcast = NULL; 722 } 723 724 out: 725 if (mcast && mcast->ah) { 726 struct dst_entry *dst = skb_dst(skb); 727 struct neighbour *n = NULL; 728 729 rcu_read_lock(); 730 if (dst) 731 n = dst_get_neighbour_noref(dst); 732 if (n && !*to_ipoib_neigh(n)) { 733 struct ipoib_neigh *neigh = ipoib_neigh_alloc(n, 734 skb->dev); 735 736 if (neigh) { 737 kref_get(&mcast->ah->ref); 738 neigh->ah = mcast->ah; 739 list_add_tail(&neigh->list, &mcast->neigh_list); 740 } 741 } 742 rcu_read_unlock(); 743 spin_unlock_irqrestore(&priv->lock, flags); 744 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN); 745 return; 746 } 747 748 unlock: 749 spin_unlock_irqrestore(&priv->lock, flags); 750 } 751 752 void ipoib_mcast_dev_flush(struct net_device *dev) 753 { 754 struct ipoib_dev_priv *priv = netdev_priv(dev); 755 LIST_HEAD(remove_list); 756 struct ipoib_mcast *mcast, *tmcast; 757 unsigned long flags; 758 759 ipoib_dbg_mcast(priv, "flushing multicast list\n"); 760 761 spin_lock_irqsave(&priv->lock, flags); 762 763 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 764 list_del(&mcast->list); 765 rb_erase(&mcast->rb_node, &priv->multicast_tree); 766 list_add_tail(&mcast->list, &remove_list); 767 } 768 769 if (priv->broadcast) { 770 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree); 771 list_add_tail(&priv->broadcast->list, &remove_list); 772 priv->broadcast = NULL; 773 } 774 775 spin_unlock_irqrestore(&priv->lock, flags); 776 777 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 778 ipoib_mcast_leave(dev, mcast); 779 ipoib_mcast_free(mcast); 780 } 781 } 782 783 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast) 784 { 785 /* reserved QPN, prefix, scope */ 786 if (memcmp(addr, broadcast, 6)) 787 return 0; 788 /* signature lower, pkey */ 789 if (memcmp(addr + 7, broadcast + 7, 3)) 790 return 0; 791 return 1; 792 } 793 794 void ipoib_mcast_restart_task(struct work_struct *work) 795 { 796 struct ipoib_dev_priv *priv = 797 container_of(work, struct ipoib_dev_priv, restart_task); 798 struct net_device *dev = priv->dev; 799 struct netdev_hw_addr *ha; 800 struct ipoib_mcast *mcast, *tmcast; 801 LIST_HEAD(remove_list); 802 unsigned long flags; 803 struct ib_sa_mcmember_rec rec; 804 805 ipoib_dbg_mcast(priv, "restarting multicast task\n"); 806 807 ipoib_mcast_stop_thread(dev, 0); 808 809 local_irq_save(flags); 810 netif_addr_lock(dev); 811 spin_lock(&priv->lock); 812 813 /* 814 * Unfortunately, the networking core only gives us a list of all of 815 * the multicast hardware addresses. We need to figure out which ones 816 * are new and which ones have been removed 817 */ 818 819 /* Clear out the found flag */ 820 list_for_each_entry(mcast, &priv->multicast_list, list) 821 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 822 823 /* Mark all of the entries that are found or don't exist */ 824 netdev_for_each_mc_addr(ha, dev) { 825 union ib_gid mgid; 826 827 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast)) 828 continue; 829 830 memcpy(mgid.raw, ha->addr + 4, sizeof mgid); 831 832 mcast = __ipoib_mcast_find(dev, &mgid); 833 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 834 struct ipoib_mcast *nmcast; 835 836 /* ignore group which is directly joined by userspace */ 837 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) && 838 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) { 839 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n", 840 mgid.raw); 841 continue; 842 } 843 844 /* Not found or send-only group, let's add a new entry */ 845 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n", 846 mgid.raw); 847 848 nmcast = ipoib_mcast_alloc(dev, 0); 849 if (!nmcast) { 850 ipoib_warn(priv, "unable to allocate memory for multicast structure\n"); 851 continue; 852 } 853 854 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags); 855 856 nmcast->mcmember.mgid = mgid; 857 858 if (mcast) { 859 /* Destroy the send only entry */ 860 list_move_tail(&mcast->list, &remove_list); 861 862 rb_replace_node(&mcast->rb_node, 863 &nmcast->rb_node, 864 &priv->multicast_tree); 865 } else 866 __ipoib_mcast_add(dev, nmcast); 867 868 list_add_tail(&nmcast->list, &priv->multicast_list); 869 } 870 871 if (mcast) 872 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 873 } 874 875 /* Remove all of the entries don't exist anymore */ 876 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 877 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) && 878 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 879 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n", 880 mcast->mcmember.mgid.raw); 881 882 rb_erase(&mcast->rb_node, &priv->multicast_tree); 883 884 /* Move to the remove list */ 885 list_move_tail(&mcast->list, &remove_list); 886 } 887 } 888 889 spin_unlock(&priv->lock); 890 netif_addr_unlock(dev); 891 local_irq_restore(flags); 892 893 /* We have to cancel outside of the spinlock */ 894 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 895 ipoib_mcast_leave(mcast->dev, mcast); 896 ipoib_mcast_free(mcast); 897 } 898 899 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 900 ipoib_mcast_start_thread(dev); 901 } 902 903 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 904 905 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev) 906 { 907 struct ipoib_mcast_iter *iter; 908 909 iter = kmalloc(sizeof *iter, GFP_KERNEL); 910 if (!iter) 911 return NULL; 912 913 iter->dev = dev; 914 memset(iter->mgid.raw, 0, 16); 915 916 if (ipoib_mcast_iter_next(iter)) { 917 kfree(iter); 918 return NULL; 919 } 920 921 return iter; 922 } 923 924 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter) 925 { 926 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 927 struct rb_node *n; 928 struct ipoib_mcast *mcast; 929 int ret = 1; 930 931 spin_lock_irq(&priv->lock); 932 933 n = rb_first(&priv->multicast_tree); 934 935 while (n) { 936 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 937 938 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw, 939 sizeof (union ib_gid)) < 0) { 940 iter->mgid = mcast->mcmember.mgid; 941 iter->created = mcast->created; 942 iter->queuelen = skb_queue_len(&mcast->pkt_queue); 943 iter->complete = !!mcast->ah; 944 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY)); 945 946 ret = 0; 947 948 break; 949 } 950 951 n = rb_next(n); 952 } 953 954 spin_unlock_irq(&priv->lock); 955 956 return ret; 957 } 958 959 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter, 960 union ib_gid *mgid, 961 unsigned long *created, 962 unsigned int *queuelen, 963 unsigned int *complete, 964 unsigned int *send_only) 965 { 966 *mgid = iter->mgid; 967 *created = iter->created; 968 *queuelen = iter->queuelen; 969 *complete = iter->complete; 970 *send_only = iter->send_only; 971 } 972 973 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 974