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 (!ah) { 244 ipoib_warn(priv, "ib_address_create failed\n"); 245 } else { 246 spin_lock_irq(&priv->lock); 247 mcast->ah = ah; 248 spin_unlock_irq(&priv->lock); 249 250 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n", 251 mcast->mcmember.mgid.raw, 252 mcast->ah->ah, 253 be16_to_cpu(mcast->mcmember.mlid), 254 mcast->mcmember.sl); 255 } 256 } 257 258 /* actually send any queued packets */ 259 netif_tx_lock_bh(dev); 260 while (!skb_queue_empty(&mcast->pkt_queue)) { 261 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue); 262 struct dst_entry *dst = skb_dst(skb); 263 struct neighbour *n = NULL; 264 265 netif_tx_unlock_bh(dev); 266 267 skb->dev = dev; 268 if (dst) 269 n = dst_get_neighbour(dst); 270 if (!dst || !n) { 271 /* put pseudoheader back on for next time */ 272 skb_push(skb, sizeof (struct ipoib_pseudoheader)); 273 } 274 275 if (dev_queue_xmit(skb)) 276 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n"); 277 netif_tx_lock_bh(dev); 278 } 279 netif_tx_unlock_bh(dev); 280 281 return 0; 282 } 283 284 static int 285 ipoib_mcast_sendonly_join_complete(int status, 286 struct ib_sa_multicast *multicast) 287 { 288 struct ipoib_mcast *mcast = multicast->context; 289 struct net_device *dev = mcast->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 %pI6, status %d\n", 301 mcast->mcmember.mgid.raw, status); 302 303 /* Flush out any queued packets */ 304 netif_tx_lock_bh(dev); 305 while (!skb_queue_empty(&mcast->pkt_queue)) { 306 ++dev->stats.tx_dropped; 307 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 308 } 309 netif_tx_unlock_bh(dev); 310 311 /* Clear the busy flag so we try again */ 312 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, 313 &mcast->flags); 314 } 315 return status; 316 } 317 318 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast) 319 { 320 struct net_device *dev = mcast->dev; 321 struct ipoib_dev_priv *priv = netdev_priv(dev); 322 struct ib_sa_mcmember_rec rec = { 323 #if 0 /* Some SMs don't support send-only yet */ 324 .join_state = 4 325 #else 326 .join_state = 1 327 #endif 328 }; 329 int ret = 0; 330 331 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 332 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n"); 333 return -ENODEV; 334 } 335 336 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) { 337 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n"); 338 return -EBUSY; 339 } 340 341 rec.mgid = mcast->mcmember.mgid; 342 rec.port_gid = priv->local_gid; 343 rec.pkey = cpu_to_be16(priv->pkey); 344 345 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, 346 priv->port, &rec, 347 IB_SA_MCMEMBER_REC_MGID | 348 IB_SA_MCMEMBER_REC_PORT_GID | 349 IB_SA_MCMEMBER_REC_PKEY | 350 IB_SA_MCMEMBER_REC_JOIN_STATE, 351 GFP_ATOMIC, 352 ipoib_mcast_sendonly_join_complete, 353 mcast); 354 if (IS_ERR(mcast->mc)) { 355 ret = PTR_ERR(mcast->mc); 356 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 357 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n", 358 ret); 359 } else { 360 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n", 361 mcast->mcmember.mgid.raw); 362 } 363 364 return ret; 365 } 366 367 void ipoib_mcast_carrier_on_task(struct work_struct *work) 368 { 369 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 370 carrier_on_task); 371 struct ib_port_attr attr; 372 373 /* 374 * Take rtnl_lock to avoid racing with ipoib_stop() and 375 * turning the carrier back on while a device is being 376 * removed. 377 */ 378 if (ib_query_port(priv->ca, priv->port, &attr) || 379 attr.state != IB_PORT_ACTIVE) { 380 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n"); 381 return; 382 } 383 384 rtnl_lock(); 385 netif_carrier_on(priv->dev); 386 rtnl_unlock(); 387 } 388 389 static int ipoib_mcast_join_complete(int status, 390 struct ib_sa_multicast *multicast) 391 { 392 struct ipoib_mcast *mcast = multicast->context; 393 struct net_device *dev = mcast->dev; 394 struct ipoib_dev_priv *priv = netdev_priv(dev); 395 396 ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n", 397 mcast->mcmember.mgid.raw, status); 398 399 /* We trap for port events ourselves. */ 400 if (status == -ENETRESET) 401 return 0; 402 403 if (!status) 404 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 405 406 if (!status) { 407 mcast->backoff = 1; 408 mutex_lock(&mcast_mutex); 409 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 410 queue_delayed_work(ipoib_workqueue, 411 &priv->mcast_task, 0); 412 mutex_unlock(&mcast_mutex); 413 414 /* 415 * Defer carrier on work to ipoib_workqueue to avoid a 416 * deadlock on rtnl_lock here. 417 */ 418 if (mcast == priv->broadcast) 419 queue_work(ipoib_workqueue, &priv->carrier_on_task); 420 421 return 0; 422 } 423 424 if (mcast->logcount++ < 20) { 425 if (status == -ETIMEDOUT || status == -EAGAIN) { 426 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n", 427 mcast->mcmember.mgid.raw, status); 428 } else { 429 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n", 430 mcast->mcmember.mgid.raw, status); 431 } 432 } 433 434 mcast->backoff *= 2; 435 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 436 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 437 438 /* Clear the busy flag so we try again */ 439 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 440 441 mutex_lock(&mcast_mutex); 442 spin_lock_irq(&priv->lock); 443 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 444 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 445 mcast->backoff * HZ); 446 spin_unlock_irq(&priv->lock); 447 mutex_unlock(&mcast_mutex); 448 449 return status; 450 } 451 452 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast, 453 int create) 454 { 455 struct ipoib_dev_priv *priv = netdev_priv(dev); 456 struct ib_sa_mcmember_rec rec = { 457 .join_state = 1 458 }; 459 ib_sa_comp_mask comp_mask; 460 int ret = 0; 461 462 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw); 463 464 rec.mgid = mcast->mcmember.mgid; 465 rec.port_gid = priv->local_gid; 466 rec.pkey = cpu_to_be16(priv->pkey); 467 468 comp_mask = 469 IB_SA_MCMEMBER_REC_MGID | 470 IB_SA_MCMEMBER_REC_PORT_GID | 471 IB_SA_MCMEMBER_REC_PKEY | 472 IB_SA_MCMEMBER_REC_JOIN_STATE; 473 474 if (create) { 475 comp_mask |= 476 IB_SA_MCMEMBER_REC_QKEY | 477 IB_SA_MCMEMBER_REC_MTU_SELECTOR | 478 IB_SA_MCMEMBER_REC_MTU | 479 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS | 480 IB_SA_MCMEMBER_REC_RATE_SELECTOR | 481 IB_SA_MCMEMBER_REC_RATE | 482 IB_SA_MCMEMBER_REC_SL | 483 IB_SA_MCMEMBER_REC_FLOW_LABEL | 484 IB_SA_MCMEMBER_REC_HOP_LIMIT; 485 486 rec.qkey = priv->broadcast->mcmember.qkey; 487 rec.mtu_selector = IB_SA_EQ; 488 rec.mtu = priv->broadcast->mcmember.mtu; 489 rec.traffic_class = priv->broadcast->mcmember.traffic_class; 490 rec.rate_selector = IB_SA_EQ; 491 rec.rate = priv->broadcast->mcmember.rate; 492 rec.sl = priv->broadcast->mcmember.sl; 493 rec.flow_label = priv->broadcast->mcmember.flow_label; 494 rec.hop_limit = priv->broadcast->mcmember.hop_limit; 495 } 496 497 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 498 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port, 499 &rec, comp_mask, GFP_KERNEL, 500 ipoib_mcast_join_complete, mcast); 501 if (IS_ERR(mcast->mc)) { 502 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 503 ret = PTR_ERR(mcast->mc); 504 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret); 505 506 mcast->backoff *= 2; 507 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 508 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 509 510 mutex_lock(&mcast_mutex); 511 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 512 queue_delayed_work(ipoib_workqueue, 513 &priv->mcast_task, 514 mcast->backoff * HZ); 515 mutex_unlock(&mcast_mutex); 516 } 517 } 518 519 void ipoib_mcast_join_task(struct work_struct *work) 520 { 521 struct ipoib_dev_priv *priv = 522 container_of(work, struct ipoib_dev_priv, mcast_task.work); 523 struct net_device *dev = priv->dev; 524 525 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags)) 526 return; 527 528 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid)) 529 ipoib_warn(priv, "ib_query_gid() failed\n"); 530 else 531 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 532 533 { 534 struct ib_port_attr attr; 535 536 if (!ib_query_port(priv->ca, priv->port, &attr)) 537 priv->local_lid = attr.lid; 538 else 539 ipoib_warn(priv, "ib_query_port failed\n"); 540 } 541 542 if (!priv->broadcast) { 543 struct ipoib_mcast *broadcast; 544 545 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 546 return; 547 548 broadcast = ipoib_mcast_alloc(dev, 1); 549 if (!broadcast) { 550 ipoib_warn(priv, "failed to allocate broadcast group\n"); 551 mutex_lock(&mcast_mutex); 552 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 553 queue_delayed_work(ipoib_workqueue, 554 &priv->mcast_task, HZ); 555 mutex_unlock(&mcast_mutex); 556 return; 557 } 558 559 spin_lock_irq(&priv->lock); 560 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 561 sizeof (union ib_gid)); 562 priv->broadcast = broadcast; 563 564 __ipoib_mcast_add(dev, priv->broadcast); 565 spin_unlock_irq(&priv->lock); 566 } 567 568 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 569 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) 570 ipoib_mcast_join(dev, priv->broadcast, 0); 571 return; 572 } 573 574 while (1) { 575 struct ipoib_mcast *mcast = NULL; 576 577 spin_lock_irq(&priv->lock); 578 list_for_each_entry(mcast, &priv->multicast_list, list) { 579 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) 580 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) 581 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 582 /* Found the next unjoined group */ 583 break; 584 } 585 } 586 spin_unlock_irq(&priv->lock); 587 588 if (&mcast->list == &priv->multicast_list) { 589 /* All done */ 590 break; 591 } 592 593 ipoib_mcast_join(dev, mcast, 1); 594 return; 595 } 596 597 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu)); 598 599 if (!ipoib_cm_admin_enabled(dev)) { 600 rtnl_lock(); 601 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu)); 602 rtnl_unlock(); 603 } 604 605 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n"); 606 607 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 608 } 609 610 int ipoib_mcast_start_thread(struct net_device *dev) 611 { 612 struct ipoib_dev_priv *priv = netdev_priv(dev); 613 614 ipoib_dbg_mcast(priv, "starting multicast thread\n"); 615 616 mutex_lock(&mcast_mutex); 617 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags)) 618 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0); 619 mutex_unlock(&mcast_mutex); 620 621 return 0; 622 } 623 624 int ipoib_mcast_stop_thread(struct net_device *dev, int flush) 625 { 626 struct ipoib_dev_priv *priv = netdev_priv(dev); 627 628 ipoib_dbg_mcast(priv, "stopping multicast thread\n"); 629 630 mutex_lock(&mcast_mutex); 631 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 632 cancel_delayed_work(&priv->mcast_task); 633 mutex_unlock(&mcast_mutex); 634 635 if (flush) 636 flush_workqueue(ipoib_workqueue); 637 638 return 0; 639 } 640 641 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast) 642 { 643 struct ipoib_dev_priv *priv = netdev_priv(dev); 644 int ret = 0; 645 646 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 647 ib_sa_free_multicast(mcast->mc); 648 649 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 650 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n", 651 mcast->mcmember.mgid.raw); 652 653 /* Remove ourselves from the multicast group */ 654 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid, 655 be16_to_cpu(mcast->mcmember.mlid)); 656 if (ret) 657 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret); 658 } 659 660 return 0; 661 } 662 663 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb) 664 { 665 struct ipoib_dev_priv *priv = netdev_priv(dev); 666 struct ipoib_mcast *mcast; 667 unsigned long flags; 668 669 spin_lock_irqsave(&priv->lock, flags); 670 671 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) || 672 !priv->broadcast || 673 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 674 ++dev->stats.tx_dropped; 675 dev_kfree_skb_any(skb); 676 goto unlock; 677 } 678 679 mcast = __ipoib_mcast_find(dev, mgid); 680 if (!mcast) { 681 /* Let's create a new send only group now */ 682 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n", 683 mgid); 684 685 mcast = ipoib_mcast_alloc(dev, 0); 686 if (!mcast) { 687 ipoib_warn(priv, "unable to allocate memory for " 688 "multicast structure\n"); 689 ++dev->stats.tx_dropped; 690 dev_kfree_skb_any(skb); 691 goto out; 692 } 693 694 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags); 695 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid)); 696 __ipoib_mcast_add(dev, mcast); 697 list_add_tail(&mcast->list, &priv->multicast_list); 698 } 699 700 if (!mcast->ah) { 701 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) 702 skb_queue_tail(&mcast->pkt_queue, skb); 703 else { 704 ++dev->stats.tx_dropped; 705 dev_kfree_skb_any(skb); 706 } 707 708 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 709 ipoib_dbg_mcast(priv, "no address vector, " 710 "but multicast join already started\n"); 711 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) 712 ipoib_mcast_sendonly_join(mcast); 713 714 /* 715 * If lookup completes between here and out:, don't 716 * want to send packet twice. 717 */ 718 mcast = NULL; 719 } 720 721 out: 722 if (mcast && mcast->ah) { 723 struct dst_entry *dst = skb_dst(skb); 724 struct neighbour *n = NULL; 725 if (dst) 726 n = dst_get_neighbour(dst); 727 if (n && !*to_ipoib_neigh(n)) { 728 struct ipoib_neigh *neigh = ipoib_neigh_alloc(n, 729 skb->dev); 730 731 if (neigh) { 732 kref_get(&mcast->ah->ref); 733 neigh->ah = mcast->ah; 734 list_add_tail(&neigh->list, &mcast->neigh_list); 735 } 736 } 737 738 spin_unlock_irqrestore(&priv->lock, flags); 739 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN); 740 return; 741 } 742 743 unlock: 744 spin_unlock_irqrestore(&priv->lock, flags); 745 } 746 747 void ipoib_mcast_dev_flush(struct net_device *dev) 748 { 749 struct ipoib_dev_priv *priv = netdev_priv(dev); 750 LIST_HEAD(remove_list); 751 struct ipoib_mcast *mcast, *tmcast; 752 unsigned long flags; 753 754 ipoib_dbg_mcast(priv, "flushing multicast list\n"); 755 756 spin_lock_irqsave(&priv->lock, flags); 757 758 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 759 list_del(&mcast->list); 760 rb_erase(&mcast->rb_node, &priv->multicast_tree); 761 list_add_tail(&mcast->list, &remove_list); 762 } 763 764 if (priv->broadcast) { 765 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree); 766 list_add_tail(&priv->broadcast->list, &remove_list); 767 priv->broadcast = NULL; 768 } 769 770 spin_unlock_irqrestore(&priv->lock, flags); 771 772 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 773 ipoib_mcast_leave(dev, mcast); 774 ipoib_mcast_free(mcast); 775 } 776 } 777 778 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast) 779 { 780 /* reserved QPN, prefix, scope */ 781 if (memcmp(addr, broadcast, 6)) 782 return 0; 783 /* signature lower, pkey */ 784 if (memcmp(addr + 7, broadcast + 7, 3)) 785 return 0; 786 return 1; 787 } 788 789 void ipoib_mcast_restart_task(struct work_struct *work) 790 { 791 struct ipoib_dev_priv *priv = 792 container_of(work, struct ipoib_dev_priv, restart_task); 793 struct net_device *dev = priv->dev; 794 struct netdev_hw_addr *ha; 795 struct ipoib_mcast *mcast, *tmcast; 796 LIST_HEAD(remove_list); 797 unsigned long flags; 798 struct ib_sa_mcmember_rec rec; 799 800 ipoib_dbg_mcast(priv, "restarting multicast task\n"); 801 802 ipoib_mcast_stop_thread(dev, 0); 803 804 local_irq_save(flags); 805 netif_addr_lock(dev); 806 spin_lock(&priv->lock); 807 808 /* 809 * Unfortunately, the networking core only gives us a list of all of 810 * the multicast hardware addresses. We need to figure out which ones 811 * are new and which ones have been removed 812 */ 813 814 /* Clear out the found flag */ 815 list_for_each_entry(mcast, &priv->multicast_list, list) 816 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 817 818 /* Mark all of the entries that are found or don't exist */ 819 netdev_for_each_mc_addr(ha, dev) { 820 union ib_gid mgid; 821 822 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast)) 823 continue; 824 825 memcpy(mgid.raw, ha->addr + 4, sizeof mgid); 826 827 mcast = __ipoib_mcast_find(dev, &mgid); 828 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 829 struct ipoib_mcast *nmcast; 830 831 /* ignore group which is directly joined by userspace */ 832 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) && 833 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) { 834 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n", 835 mgid.raw); 836 continue; 837 } 838 839 /* Not found or send-only group, let's add a new entry */ 840 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n", 841 mgid.raw); 842 843 nmcast = ipoib_mcast_alloc(dev, 0); 844 if (!nmcast) { 845 ipoib_warn(priv, "unable to allocate memory for multicast structure\n"); 846 continue; 847 } 848 849 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags); 850 851 nmcast->mcmember.mgid = mgid; 852 853 if (mcast) { 854 /* Destroy the send only entry */ 855 list_move_tail(&mcast->list, &remove_list); 856 857 rb_replace_node(&mcast->rb_node, 858 &nmcast->rb_node, 859 &priv->multicast_tree); 860 } else 861 __ipoib_mcast_add(dev, nmcast); 862 863 list_add_tail(&nmcast->list, &priv->multicast_list); 864 } 865 866 if (mcast) 867 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 868 } 869 870 /* Remove all of the entries don't exist anymore */ 871 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 872 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) && 873 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 874 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n", 875 mcast->mcmember.mgid.raw); 876 877 rb_erase(&mcast->rb_node, &priv->multicast_tree); 878 879 /* Move to the remove list */ 880 list_move_tail(&mcast->list, &remove_list); 881 } 882 } 883 884 spin_unlock(&priv->lock); 885 netif_addr_unlock(dev); 886 local_irq_restore(flags); 887 888 /* We have to cancel outside of the spinlock */ 889 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 890 ipoib_mcast_leave(mcast->dev, mcast); 891 ipoib_mcast_free(mcast); 892 } 893 894 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 895 ipoib_mcast_start_thread(dev); 896 } 897 898 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 899 900 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev) 901 { 902 struct ipoib_mcast_iter *iter; 903 904 iter = kmalloc(sizeof *iter, GFP_KERNEL); 905 if (!iter) 906 return NULL; 907 908 iter->dev = dev; 909 memset(iter->mgid.raw, 0, 16); 910 911 if (ipoib_mcast_iter_next(iter)) { 912 kfree(iter); 913 return NULL; 914 } 915 916 return iter; 917 } 918 919 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter) 920 { 921 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 922 struct rb_node *n; 923 struct ipoib_mcast *mcast; 924 int ret = 1; 925 926 spin_lock_irq(&priv->lock); 927 928 n = rb_first(&priv->multicast_tree); 929 930 while (n) { 931 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 932 933 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw, 934 sizeof (union ib_gid)) < 0) { 935 iter->mgid = mcast->mcmember.mgid; 936 iter->created = mcast->created; 937 iter->queuelen = skb_queue_len(&mcast->pkt_queue); 938 iter->complete = !!mcast->ah; 939 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY)); 940 941 ret = 0; 942 943 break; 944 } 945 946 n = rb_next(n); 947 } 948 949 spin_unlock_irq(&priv->lock); 950 951 return ret; 952 } 953 954 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter, 955 union ib_gid *mgid, 956 unsigned long *created, 957 unsigned int *queuelen, 958 unsigned int *complete, 959 unsigned int *send_only) 960 { 961 *mgid = iter->mgid; 962 *created = iter->created; 963 *queuelen = iter->queuelen; 964 *complete = iter->complete; 965 *send_only = iter->send_only; 966 } 967 968 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 969