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); 265 266 netif_tx_unlock_bh(dev); 267 268 skb->dev = dev; 269 if (dev_queue_xmit(skb)) 270 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n"); 271 272 netif_tx_lock_bh(dev); 273 } 274 netif_tx_unlock_bh(dev); 275 276 return 0; 277 } 278 279 static int 280 ipoib_mcast_sendonly_join_complete(int status, 281 struct ib_sa_multicast *multicast) 282 { 283 struct ipoib_mcast *mcast = multicast->context; 284 struct net_device *dev = mcast->dev; 285 286 /* We trap for port events ourselves. */ 287 if (status == -ENETRESET) 288 return 0; 289 290 if (!status) 291 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 292 293 if (status) { 294 if (mcast->logcount++ < 20) 295 ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for %pI6, status %d\n", 296 mcast->mcmember.mgid.raw, status); 297 298 /* Flush out any queued packets */ 299 netif_tx_lock_bh(dev); 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 netif_tx_unlock_bh(dev); 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 %pI6, starting join\n", 356 mcast->mcmember.mgid.raw); 357 } 358 359 return ret; 360 } 361 362 void ipoib_mcast_carrier_on_task(struct work_struct *work) 363 { 364 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 365 carrier_on_task); 366 struct ib_port_attr attr; 367 368 /* 369 * Take rtnl_lock to avoid racing with ipoib_stop() and 370 * turning the carrier back on while a device is being 371 * removed. 372 */ 373 if (ib_query_port(priv->ca, priv->port, &attr) || 374 attr.state != IB_PORT_ACTIVE) { 375 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n"); 376 return; 377 } 378 379 rtnl_lock(); 380 netif_carrier_on(priv->dev); 381 rtnl_unlock(); 382 } 383 384 static int ipoib_mcast_join_complete(int status, 385 struct ib_sa_multicast *multicast) 386 { 387 struct ipoib_mcast *mcast = multicast->context; 388 struct net_device *dev = mcast->dev; 389 struct ipoib_dev_priv *priv = netdev_priv(dev); 390 391 ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n", 392 mcast->mcmember.mgid.raw, status); 393 394 /* We trap for port events ourselves. */ 395 if (status == -ENETRESET) 396 return 0; 397 398 if (!status) 399 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 400 401 if (!status) { 402 mcast->backoff = 1; 403 mutex_lock(&mcast_mutex); 404 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 405 queue_delayed_work(ipoib_workqueue, 406 &priv->mcast_task, 0); 407 mutex_unlock(&mcast_mutex); 408 409 /* 410 * Defer carrier on work to ipoib_workqueue to avoid a 411 * deadlock on rtnl_lock here. 412 */ 413 if (mcast == priv->broadcast) 414 queue_work(ipoib_workqueue, &priv->carrier_on_task); 415 416 return 0; 417 } 418 419 if (mcast->logcount++ < 20) { 420 if (status == -ETIMEDOUT || status == -EAGAIN) { 421 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n", 422 mcast->mcmember.mgid.raw, status); 423 } else { 424 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n", 425 mcast->mcmember.mgid.raw, status); 426 } 427 } 428 429 mcast->backoff *= 2; 430 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 431 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 432 433 /* Clear the busy flag so we try again */ 434 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 435 436 mutex_lock(&mcast_mutex); 437 spin_lock_irq(&priv->lock); 438 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 439 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 440 mcast->backoff * HZ); 441 spin_unlock_irq(&priv->lock); 442 mutex_unlock(&mcast_mutex); 443 444 return status; 445 } 446 447 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast, 448 int create) 449 { 450 struct ipoib_dev_priv *priv = netdev_priv(dev); 451 struct ib_sa_mcmember_rec rec = { 452 .join_state = 1 453 }; 454 ib_sa_comp_mask comp_mask; 455 int ret = 0; 456 457 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw); 458 459 rec.mgid = mcast->mcmember.mgid; 460 rec.port_gid = priv->local_gid; 461 rec.pkey = cpu_to_be16(priv->pkey); 462 463 comp_mask = 464 IB_SA_MCMEMBER_REC_MGID | 465 IB_SA_MCMEMBER_REC_PORT_GID | 466 IB_SA_MCMEMBER_REC_PKEY | 467 IB_SA_MCMEMBER_REC_JOIN_STATE; 468 469 if (create) { 470 comp_mask |= 471 IB_SA_MCMEMBER_REC_QKEY | 472 IB_SA_MCMEMBER_REC_MTU_SELECTOR | 473 IB_SA_MCMEMBER_REC_MTU | 474 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS | 475 IB_SA_MCMEMBER_REC_RATE_SELECTOR | 476 IB_SA_MCMEMBER_REC_RATE | 477 IB_SA_MCMEMBER_REC_SL | 478 IB_SA_MCMEMBER_REC_FLOW_LABEL | 479 IB_SA_MCMEMBER_REC_HOP_LIMIT; 480 481 rec.qkey = priv->broadcast->mcmember.qkey; 482 rec.mtu_selector = IB_SA_EQ; 483 rec.mtu = priv->broadcast->mcmember.mtu; 484 rec.traffic_class = priv->broadcast->mcmember.traffic_class; 485 rec.rate_selector = IB_SA_EQ; 486 rec.rate = priv->broadcast->mcmember.rate; 487 rec.sl = priv->broadcast->mcmember.sl; 488 rec.flow_label = priv->broadcast->mcmember.flow_label; 489 rec.hop_limit = priv->broadcast->mcmember.hop_limit; 490 } 491 492 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 493 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port, 494 &rec, comp_mask, GFP_KERNEL, 495 ipoib_mcast_join_complete, mcast); 496 if (IS_ERR(mcast->mc)) { 497 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 498 ret = PTR_ERR(mcast->mc); 499 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret); 500 501 mcast->backoff *= 2; 502 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 503 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 504 505 mutex_lock(&mcast_mutex); 506 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 507 queue_delayed_work(ipoib_workqueue, 508 &priv->mcast_task, 509 mcast->backoff * HZ); 510 mutex_unlock(&mcast_mutex); 511 } 512 } 513 514 void ipoib_mcast_join_task(struct work_struct *work) 515 { 516 struct ipoib_dev_priv *priv = 517 container_of(work, struct ipoib_dev_priv, mcast_task.work); 518 struct net_device *dev = priv->dev; 519 520 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags)) 521 return; 522 523 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid)) 524 ipoib_warn(priv, "ib_query_gid() failed\n"); 525 else 526 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 527 528 { 529 struct ib_port_attr attr; 530 531 if (!ib_query_port(priv->ca, priv->port, &attr)) 532 priv->local_lid = attr.lid; 533 else 534 ipoib_warn(priv, "ib_query_port failed\n"); 535 } 536 537 if (!priv->broadcast) { 538 struct ipoib_mcast *broadcast; 539 540 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 541 return; 542 543 broadcast = ipoib_mcast_alloc(dev, 1); 544 if (!broadcast) { 545 ipoib_warn(priv, "failed to allocate broadcast group\n"); 546 mutex_lock(&mcast_mutex); 547 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 548 queue_delayed_work(ipoib_workqueue, 549 &priv->mcast_task, HZ); 550 mutex_unlock(&mcast_mutex); 551 return; 552 } 553 554 spin_lock_irq(&priv->lock); 555 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 556 sizeof (union ib_gid)); 557 priv->broadcast = broadcast; 558 559 __ipoib_mcast_add(dev, priv->broadcast); 560 spin_unlock_irq(&priv->lock); 561 } 562 563 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 564 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) 565 ipoib_mcast_join(dev, priv->broadcast, 0); 566 return; 567 } 568 569 while (1) { 570 struct ipoib_mcast *mcast = NULL; 571 572 spin_lock_irq(&priv->lock); 573 list_for_each_entry(mcast, &priv->multicast_list, list) { 574 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) 575 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) 576 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 577 /* Found the next unjoined group */ 578 break; 579 } 580 } 581 spin_unlock_irq(&priv->lock); 582 583 if (&mcast->list == &priv->multicast_list) { 584 /* All done */ 585 break; 586 } 587 588 ipoib_mcast_join(dev, mcast, 1); 589 return; 590 } 591 592 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu)); 593 594 if (!ipoib_cm_admin_enabled(dev)) { 595 rtnl_lock(); 596 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu)); 597 rtnl_unlock(); 598 } 599 600 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n"); 601 602 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 603 } 604 605 int ipoib_mcast_start_thread(struct net_device *dev) 606 { 607 struct ipoib_dev_priv *priv = netdev_priv(dev); 608 609 ipoib_dbg_mcast(priv, "starting multicast thread\n"); 610 611 mutex_lock(&mcast_mutex); 612 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags)) 613 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0); 614 mutex_unlock(&mcast_mutex); 615 616 return 0; 617 } 618 619 int ipoib_mcast_stop_thread(struct net_device *dev, int flush) 620 { 621 struct ipoib_dev_priv *priv = netdev_priv(dev); 622 623 ipoib_dbg_mcast(priv, "stopping multicast thread\n"); 624 625 mutex_lock(&mcast_mutex); 626 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 627 cancel_delayed_work(&priv->mcast_task); 628 mutex_unlock(&mcast_mutex); 629 630 if (flush) 631 flush_workqueue(ipoib_workqueue); 632 633 return 0; 634 } 635 636 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast) 637 { 638 struct ipoib_dev_priv *priv = netdev_priv(dev); 639 int ret = 0; 640 641 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 642 ib_sa_free_multicast(mcast->mc); 643 644 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 645 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n", 646 mcast->mcmember.mgid.raw); 647 648 /* Remove ourselves from the multicast group */ 649 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid, 650 be16_to_cpu(mcast->mcmember.mlid)); 651 if (ret) 652 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret); 653 } 654 655 return 0; 656 } 657 658 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb) 659 { 660 struct ipoib_dev_priv *priv = netdev_priv(dev); 661 struct ipoib_mcast *mcast; 662 unsigned long flags; 663 664 spin_lock_irqsave(&priv->lock, flags); 665 666 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) || 667 !priv->broadcast || 668 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 669 ++dev->stats.tx_dropped; 670 dev_kfree_skb_any(skb); 671 goto unlock; 672 } 673 674 mcast = __ipoib_mcast_find(dev, mgid); 675 if (!mcast) { 676 /* Let's create a new send only group now */ 677 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n", 678 mgid); 679 680 mcast = ipoib_mcast_alloc(dev, 0); 681 if (!mcast) { 682 ipoib_warn(priv, "unable to allocate memory for " 683 "multicast structure\n"); 684 ++dev->stats.tx_dropped; 685 dev_kfree_skb_any(skb); 686 goto out; 687 } 688 689 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags); 690 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid)); 691 __ipoib_mcast_add(dev, mcast); 692 list_add_tail(&mcast->list, &priv->multicast_list); 693 } 694 695 if (!mcast->ah) { 696 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) 697 skb_queue_tail(&mcast->pkt_queue, skb); 698 else { 699 ++dev->stats.tx_dropped; 700 dev_kfree_skb_any(skb); 701 } 702 703 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 704 ipoib_dbg_mcast(priv, "no address vector, " 705 "but multicast join already started\n"); 706 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) 707 ipoib_mcast_sendonly_join(mcast); 708 709 /* 710 * If lookup completes between here and out:, don't 711 * want to send packet twice. 712 */ 713 mcast = NULL; 714 } 715 716 out: 717 if (mcast && mcast->ah) { 718 struct dst_entry *dst = skb_dst(skb); 719 struct neighbour *n = NULL; 720 721 rcu_read_lock(); 722 if (dst) 723 n = dst_get_neighbour_noref(dst); 724 if (n && !*to_ipoib_neigh(n)) { 725 struct ipoib_neigh *neigh = ipoib_neigh_alloc(n, 726 skb->dev); 727 728 if (neigh) { 729 kref_get(&mcast->ah->ref); 730 neigh->ah = mcast->ah; 731 list_add_tail(&neigh->list, &mcast->neigh_list); 732 } 733 } 734 rcu_read_unlock(); 735 spin_unlock_irqrestore(&priv->lock, flags); 736 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN); 737 return; 738 } 739 740 unlock: 741 spin_unlock_irqrestore(&priv->lock, flags); 742 } 743 744 void ipoib_mcast_dev_flush(struct net_device *dev) 745 { 746 struct ipoib_dev_priv *priv = netdev_priv(dev); 747 LIST_HEAD(remove_list); 748 struct ipoib_mcast *mcast, *tmcast; 749 unsigned long flags; 750 751 ipoib_dbg_mcast(priv, "flushing multicast list\n"); 752 753 spin_lock_irqsave(&priv->lock, flags); 754 755 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 756 list_del(&mcast->list); 757 rb_erase(&mcast->rb_node, &priv->multicast_tree); 758 list_add_tail(&mcast->list, &remove_list); 759 } 760 761 if (priv->broadcast) { 762 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree); 763 list_add_tail(&priv->broadcast->list, &remove_list); 764 priv->broadcast = NULL; 765 } 766 767 spin_unlock_irqrestore(&priv->lock, flags); 768 769 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 770 ipoib_mcast_leave(dev, mcast); 771 ipoib_mcast_free(mcast); 772 } 773 } 774 775 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast) 776 { 777 /* reserved QPN, prefix, scope */ 778 if (memcmp(addr, broadcast, 6)) 779 return 0; 780 /* signature lower, pkey */ 781 if (memcmp(addr + 7, broadcast + 7, 3)) 782 return 0; 783 return 1; 784 } 785 786 void ipoib_mcast_restart_task(struct work_struct *work) 787 { 788 struct ipoib_dev_priv *priv = 789 container_of(work, struct ipoib_dev_priv, restart_task); 790 struct net_device *dev = priv->dev; 791 struct netdev_hw_addr *ha; 792 struct ipoib_mcast *mcast, *tmcast; 793 LIST_HEAD(remove_list); 794 unsigned long flags; 795 struct ib_sa_mcmember_rec rec; 796 797 ipoib_dbg_mcast(priv, "restarting multicast task\n"); 798 799 ipoib_mcast_stop_thread(dev, 0); 800 801 local_irq_save(flags); 802 netif_addr_lock(dev); 803 spin_lock(&priv->lock); 804 805 /* 806 * Unfortunately, the networking core only gives us a list of all of 807 * the multicast hardware addresses. We need to figure out which ones 808 * are new and which ones have been removed 809 */ 810 811 /* Clear out the found flag */ 812 list_for_each_entry(mcast, &priv->multicast_list, list) 813 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 814 815 /* Mark all of the entries that are found or don't exist */ 816 netdev_for_each_mc_addr(ha, dev) { 817 union ib_gid mgid; 818 819 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast)) 820 continue; 821 822 memcpy(mgid.raw, ha->addr + 4, sizeof mgid); 823 824 mcast = __ipoib_mcast_find(dev, &mgid); 825 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 826 struct ipoib_mcast *nmcast; 827 828 /* ignore group which is directly joined by userspace */ 829 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) && 830 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) { 831 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n", 832 mgid.raw); 833 continue; 834 } 835 836 /* Not found or send-only group, let's add a new entry */ 837 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n", 838 mgid.raw); 839 840 nmcast = ipoib_mcast_alloc(dev, 0); 841 if (!nmcast) { 842 ipoib_warn(priv, "unable to allocate memory for multicast structure\n"); 843 continue; 844 } 845 846 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags); 847 848 nmcast->mcmember.mgid = mgid; 849 850 if (mcast) { 851 /* Destroy the send only entry */ 852 list_move_tail(&mcast->list, &remove_list); 853 854 rb_replace_node(&mcast->rb_node, 855 &nmcast->rb_node, 856 &priv->multicast_tree); 857 } else 858 __ipoib_mcast_add(dev, nmcast); 859 860 list_add_tail(&nmcast->list, &priv->multicast_list); 861 } 862 863 if (mcast) 864 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 865 } 866 867 /* Remove all of the entries don't exist anymore */ 868 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 869 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) && 870 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 871 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n", 872 mcast->mcmember.mgid.raw); 873 874 rb_erase(&mcast->rb_node, &priv->multicast_tree); 875 876 /* Move to the remove list */ 877 list_move_tail(&mcast->list, &remove_list); 878 } 879 } 880 881 spin_unlock(&priv->lock); 882 netif_addr_unlock(dev); 883 local_irq_restore(flags); 884 885 /* We have to cancel outside of the spinlock */ 886 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 887 ipoib_mcast_leave(mcast->dev, mcast); 888 ipoib_mcast_free(mcast); 889 } 890 891 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 892 ipoib_mcast_start_thread(dev); 893 } 894 895 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 896 897 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev) 898 { 899 struct ipoib_mcast_iter *iter; 900 901 iter = kmalloc(sizeof *iter, GFP_KERNEL); 902 if (!iter) 903 return NULL; 904 905 iter->dev = dev; 906 memset(iter->mgid.raw, 0, 16); 907 908 if (ipoib_mcast_iter_next(iter)) { 909 kfree(iter); 910 return NULL; 911 } 912 913 return iter; 914 } 915 916 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter) 917 { 918 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 919 struct rb_node *n; 920 struct ipoib_mcast *mcast; 921 int ret = 1; 922 923 spin_lock_irq(&priv->lock); 924 925 n = rb_first(&priv->multicast_tree); 926 927 while (n) { 928 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 929 930 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw, 931 sizeof (union ib_gid)) < 0) { 932 iter->mgid = mcast->mcmember.mgid; 933 iter->created = mcast->created; 934 iter->queuelen = skb_queue_len(&mcast->pkt_queue); 935 iter->complete = !!mcast->ah; 936 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY)); 937 938 ret = 0; 939 940 break; 941 } 942 943 n = rb_next(n); 944 } 945 946 spin_unlock_irq(&priv->lock); 947 948 return ret; 949 } 950 951 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter, 952 union ib_gid *mgid, 953 unsigned long *created, 954 unsigned int *queuelen, 955 unsigned int *complete, 956 unsigned int *send_only) 957 { 958 *mgid = iter->mgid; 959 *created = iter->created; 960 *queuelen = iter->queuelen; 961 *complete = iter->complete; 962 *send_only = iter->send_only; 963 } 964 965 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 966