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 int tx_dropped = 0; 73 74 ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n", 75 mcast->mcmember.mgid.raw); 76 77 /* remove all neigh connected to this mcast */ 78 ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw); 79 80 if (mcast->ah) 81 ipoib_put_ah(mcast->ah); 82 83 while (!skb_queue_empty(&mcast->pkt_queue)) { 84 ++tx_dropped; 85 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 86 } 87 88 netif_tx_lock_bh(dev); 89 dev->stats.tx_dropped += tx_dropped; 90 netif_tx_unlock_bh(dev); 91 92 kfree(mcast); 93 } 94 95 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev, 96 int can_sleep) 97 { 98 struct ipoib_mcast *mcast; 99 100 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC); 101 if (!mcast) 102 return NULL; 103 104 mcast->dev = dev; 105 mcast->created = jiffies; 106 mcast->backoff = 1; 107 108 INIT_LIST_HEAD(&mcast->list); 109 INIT_LIST_HEAD(&mcast->neigh_list); 110 skb_queue_head_init(&mcast->pkt_queue); 111 112 return mcast; 113 } 114 115 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid) 116 { 117 struct ipoib_dev_priv *priv = netdev_priv(dev); 118 struct rb_node *n = priv->multicast_tree.rb_node; 119 120 while (n) { 121 struct ipoib_mcast *mcast; 122 int ret; 123 124 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 125 126 ret = memcmp(mgid, mcast->mcmember.mgid.raw, 127 sizeof (union ib_gid)); 128 if (ret < 0) 129 n = n->rb_left; 130 else if (ret > 0) 131 n = n->rb_right; 132 else 133 return mcast; 134 } 135 136 return NULL; 137 } 138 139 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast) 140 { 141 struct ipoib_dev_priv *priv = netdev_priv(dev); 142 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL; 143 144 while (*n) { 145 struct ipoib_mcast *tmcast; 146 int ret; 147 148 pn = *n; 149 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node); 150 151 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw, 152 sizeof (union ib_gid)); 153 if (ret < 0) 154 n = &pn->rb_left; 155 else if (ret > 0) 156 n = &pn->rb_right; 157 else 158 return -EEXIST; 159 } 160 161 rb_link_node(&mcast->rb_node, pn, n); 162 rb_insert_color(&mcast->rb_node, &priv->multicast_tree); 163 164 return 0; 165 } 166 167 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast, 168 struct ib_sa_mcmember_rec *mcmember) 169 { 170 struct net_device *dev = mcast->dev; 171 struct ipoib_dev_priv *priv = netdev_priv(dev); 172 struct ipoib_ah *ah; 173 int ret; 174 int set_qkey = 0; 175 176 mcast->mcmember = *mcmember; 177 178 /* Set the cached Q_Key before we attach if it's the broadcast group */ 179 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 180 sizeof (union ib_gid))) { 181 spin_lock_irq(&priv->lock); 182 if (!priv->broadcast) { 183 spin_unlock_irq(&priv->lock); 184 return -EAGAIN; 185 } 186 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey); 187 spin_unlock_irq(&priv->lock); 188 priv->tx_wr.wr.ud.remote_qkey = priv->qkey; 189 set_qkey = 1; 190 } 191 192 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 193 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 194 ipoib_warn(priv, "multicast group %pI6 already attached\n", 195 mcast->mcmember.mgid.raw); 196 197 return 0; 198 } 199 200 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid), 201 &mcast->mcmember.mgid, set_qkey); 202 if (ret < 0) { 203 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n", 204 mcast->mcmember.mgid.raw); 205 206 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags); 207 return ret; 208 } 209 } 210 211 { 212 struct ib_ah_attr av = { 213 .dlid = be16_to_cpu(mcast->mcmember.mlid), 214 .port_num = priv->port, 215 .sl = mcast->mcmember.sl, 216 .ah_flags = IB_AH_GRH, 217 .static_rate = mcast->mcmember.rate, 218 .grh = { 219 .flow_label = be32_to_cpu(mcast->mcmember.flow_label), 220 .hop_limit = mcast->mcmember.hop_limit, 221 .sgid_index = 0, 222 .traffic_class = mcast->mcmember.traffic_class 223 } 224 }; 225 av.grh.dgid = mcast->mcmember.mgid; 226 227 ah = ipoib_create_ah(dev, priv->pd, &av); 228 if (IS_ERR(ah)) { 229 ipoib_warn(priv, "ib_address_create failed %ld\n", 230 -PTR_ERR(ah)); 231 /* use original error */ 232 return PTR_ERR(ah); 233 } else { 234 spin_lock_irq(&priv->lock); 235 mcast->ah = ah; 236 spin_unlock_irq(&priv->lock); 237 238 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n", 239 mcast->mcmember.mgid.raw, 240 mcast->ah->ah, 241 be16_to_cpu(mcast->mcmember.mlid), 242 mcast->mcmember.sl); 243 } 244 } 245 246 /* actually send any queued packets */ 247 netif_tx_lock_bh(dev); 248 while (!skb_queue_empty(&mcast->pkt_queue)) { 249 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue); 250 251 netif_tx_unlock_bh(dev); 252 253 skb->dev = dev; 254 if (dev_queue_xmit(skb)) 255 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n"); 256 257 netif_tx_lock_bh(dev); 258 } 259 netif_tx_unlock_bh(dev); 260 261 return 0; 262 } 263 264 static int 265 ipoib_mcast_sendonly_join_complete(int status, 266 struct ib_sa_multicast *multicast) 267 { 268 struct ipoib_mcast *mcast = multicast->context; 269 struct net_device *dev = mcast->dev; 270 271 /* We trap for port events ourselves. */ 272 if (status == -ENETRESET) 273 return 0; 274 275 if (!status) 276 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 277 278 if (status) { 279 if (mcast->logcount++ < 20) 280 ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for %pI6, status %d\n", 281 mcast->mcmember.mgid.raw, status); 282 283 /* Flush out any queued packets */ 284 netif_tx_lock_bh(dev); 285 while (!skb_queue_empty(&mcast->pkt_queue)) { 286 ++dev->stats.tx_dropped; 287 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 288 } 289 netif_tx_unlock_bh(dev); 290 291 /* Clear the busy flag so we try again */ 292 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, 293 &mcast->flags); 294 } 295 return status; 296 } 297 298 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast) 299 { 300 struct net_device *dev = mcast->dev; 301 struct ipoib_dev_priv *priv = netdev_priv(dev); 302 struct ib_sa_mcmember_rec rec = { 303 #if 0 /* Some SMs don't support send-only yet */ 304 .join_state = 4 305 #else 306 .join_state = 1 307 #endif 308 }; 309 int ret = 0; 310 311 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 312 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n"); 313 return -ENODEV; 314 } 315 316 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) { 317 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n"); 318 return -EBUSY; 319 } 320 321 rec.mgid = mcast->mcmember.mgid; 322 rec.port_gid = priv->local_gid; 323 rec.pkey = cpu_to_be16(priv->pkey); 324 325 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, 326 priv->port, &rec, 327 IB_SA_MCMEMBER_REC_MGID | 328 IB_SA_MCMEMBER_REC_PORT_GID | 329 IB_SA_MCMEMBER_REC_PKEY | 330 IB_SA_MCMEMBER_REC_JOIN_STATE, 331 GFP_ATOMIC, 332 ipoib_mcast_sendonly_join_complete, 333 mcast); 334 if (IS_ERR(mcast->mc)) { 335 ret = PTR_ERR(mcast->mc); 336 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 337 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n", 338 ret); 339 } else { 340 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting join\n", 341 mcast->mcmember.mgid.raw); 342 } 343 344 return ret; 345 } 346 347 void ipoib_mcast_carrier_on_task(struct work_struct *work) 348 { 349 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 350 carrier_on_task); 351 struct ib_port_attr attr; 352 353 /* 354 * Take rtnl_lock to avoid racing with ipoib_stop() and 355 * turning the carrier back on while a device is being 356 * removed. 357 */ 358 if (ib_query_port(priv->ca, priv->port, &attr) || 359 attr.state != IB_PORT_ACTIVE) { 360 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n"); 361 return; 362 } 363 364 rtnl_lock(); 365 netif_carrier_on(priv->dev); 366 rtnl_unlock(); 367 } 368 369 static int ipoib_mcast_join_complete(int status, 370 struct ib_sa_multicast *multicast) 371 { 372 struct ipoib_mcast *mcast = multicast->context; 373 struct net_device *dev = mcast->dev; 374 struct ipoib_dev_priv *priv = netdev_priv(dev); 375 376 ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n", 377 mcast->mcmember.mgid.raw, status); 378 379 /* We trap for port events ourselves. */ 380 if (status == -ENETRESET) 381 return 0; 382 383 if (!status) 384 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 385 386 if (!status) { 387 mcast->backoff = 1; 388 mutex_lock(&mcast_mutex); 389 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 390 queue_delayed_work(ipoib_workqueue, 391 &priv->mcast_task, 0); 392 mutex_unlock(&mcast_mutex); 393 394 /* 395 * Defer carrier on work to ipoib_workqueue to avoid a 396 * deadlock on rtnl_lock here. 397 */ 398 if (mcast == priv->broadcast) 399 queue_work(ipoib_workqueue, &priv->carrier_on_task); 400 401 return 0; 402 } 403 404 if (mcast->logcount++ < 20) { 405 if (status == -ETIMEDOUT || status == -EAGAIN) { 406 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n", 407 mcast->mcmember.mgid.raw, status); 408 } else { 409 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n", 410 mcast->mcmember.mgid.raw, status); 411 } 412 } 413 414 mcast->backoff *= 2; 415 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 416 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 417 418 /* Clear the busy flag so we try again */ 419 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 420 421 mutex_lock(&mcast_mutex); 422 spin_lock_irq(&priv->lock); 423 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 424 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 425 mcast->backoff * HZ); 426 spin_unlock_irq(&priv->lock); 427 mutex_unlock(&mcast_mutex); 428 429 return status; 430 } 431 432 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast, 433 int create) 434 { 435 struct ipoib_dev_priv *priv = netdev_priv(dev); 436 struct ib_sa_mcmember_rec rec = { 437 .join_state = 1 438 }; 439 ib_sa_comp_mask comp_mask; 440 int ret = 0; 441 442 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw); 443 444 rec.mgid = mcast->mcmember.mgid; 445 rec.port_gid = priv->local_gid; 446 rec.pkey = cpu_to_be16(priv->pkey); 447 448 comp_mask = 449 IB_SA_MCMEMBER_REC_MGID | 450 IB_SA_MCMEMBER_REC_PORT_GID | 451 IB_SA_MCMEMBER_REC_PKEY | 452 IB_SA_MCMEMBER_REC_JOIN_STATE; 453 454 if (create) { 455 comp_mask |= 456 IB_SA_MCMEMBER_REC_QKEY | 457 IB_SA_MCMEMBER_REC_MTU_SELECTOR | 458 IB_SA_MCMEMBER_REC_MTU | 459 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS | 460 IB_SA_MCMEMBER_REC_RATE_SELECTOR | 461 IB_SA_MCMEMBER_REC_RATE | 462 IB_SA_MCMEMBER_REC_SL | 463 IB_SA_MCMEMBER_REC_FLOW_LABEL | 464 IB_SA_MCMEMBER_REC_HOP_LIMIT; 465 466 rec.qkey = priv->broadcast->mcmember.qkey; 467 rec.mtu_selector = IB_SA_EQ; 468 rec.mtu = priv->broadcast->mcmember.mtu; 469 rec.traffic_class = priv->broadcast->mcmember.traffic_class; 470 rec.rate_selector = IB_SA_EQ; 471 rec.rate = priv->broadcast->mcmember.rate; 472 rec.sl = priv->broadcast->mcmember.sl; 473 rec.flow_label = priv->broadcast->mcmember.flow_label; 474 rec.hop_limit = priv->broadcast->mcmember.hop_limit; 475 } 476 477 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 478 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port, 479 &rec, comp_mask, GFP_KERNEL, 480 ipoib_mcast_join_complete, mcast); 481 if (IS_ERR(mcast->mc)) { 482 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 483 ret = PTR_ERR(mcast->mc); 484 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret); 485 486 mcast->backoff *= 2; 487 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 488 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 489 490 mutex_lock(&mcast_mutex); 491 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 492 queue_delayed_work(ipoib_workqueue, 493 &priv->mcast_task, 494 mcast->backoff * HZ); 495 mutex_unlock(&mcast_mutex); 496 } 497 } 498 499 void ipoib_mcast_join_task(struct work_struct *work) 500 { 501 struct ipoib_dev_priv *priv = 502 container_of(work, struct ipoib_dev_priv, mcast_task.work); 503 struct net_device *dev = priv->dev; 504 505 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags)) 506 return; 507 508 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid)) 509 ipoib_warn(priv, "ib_query_gid() failed\n"); 510 else 511 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 512 513 { 514 struct ib_port_attr attr; 515 516 if (!ib_query_port(priv->ca, priv->port, &attr)) 517 priv->local_lid = attr.lid; 518 else 519 ipoib_warn(priv, "ib_query_port failed\n"); 520 } 521 522 if (!priv->broadcast) { 523 struct ipoib_mcast *broadcast; 524 525 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 526 return; 527 528 broadcast = ipoib_mcast_alloc(dev, 1); 529 if (!broadcast) { 530 ipoib_warn(priv, "failed to allocate broadcast group\n"); 531 mutex_lock(&mcast_mutex); 532 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 533 queue_delayed_work(ipoib_workqueue, 534 &priv->mcast_task, HZ); 535 mutex_unlock(&mcast_mutex); 536 return; 537 } 538 539 spin_lock_irq(&priv->lock); 540 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 541 sizeof (union ib_gid)); 542 priv->broadcast = broadcast; 543 544 __ipoib_mcast_add(dev, priv->broadcast); 545 spin_unlock_irq(&priv->lock); 546 } 547 548 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 549 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) 550 ipoib_mcast_join(dev, priv->broadcast, 0); 551 return; 552 } 553 554 while (1) { 555 struct ipoib_mcast *mcast = NULL; 556 557 spin_lock_irq(&priv->lock); 558 list_for_each_entry(mcast, &priv->multicast_list, list) { 559 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) 560 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) 561 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 562 /* Found the next unjoined group */ 563 break; 564 } 565 } 566 spin_unlock_irq(&priv->lock); 567 568 if (&mcast->list == &priv->multicast_list) { 569 /* All done */ 570 break; 571 } 572 573 ipoib_mcast_join(dev, mcast, 1); 574 return; 575 } 576 577 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu)); 578 579 if (!ipoib_cm_admin_enabled(dev)) { 580 rtnl_lock(); 581 dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu)); 582 rtnl_unlock(); 583 } 584 585 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n"); 586 587 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 588 } 589 590 int ipoib_mcast_start_thread(struct net_device *dev) 591 { 592 struct ipoib_dev_priv *priv = netdev_priv(dev); 593 594 ipoib_dbg_mcast(priv, "starting multicast thread\n"); 595 596 mutex_lock(&mcast_mutex); 597 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags)) 598 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0); 599 mutex_unlock(&mcast_mutex); 600 601 return 0; 602 } 603 604 int ipoib_mcast_stop_thread(struct net_device *dev, int flush) 605 { 606 struct ipoib_dev_priv *priv = netdev_priv(dev); 607 608 ipoib_dbg_mcast(priv, "stopping multicast thread\n"); 609 610 mutex_lock(&mcast_mutex); 611 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 612 cancel_delayed_work(&priv->mcast_task); 613 mutex_unlock(&mcast_mutex); 614 615 if (flush) 616 flush_workqueue(ipoib_workqueue); 617 618 return 0; 619 } 620 621 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast) 622 { 623 struct ipoib_dev_priv *priv = netdev_priv(dev); 624 int ret = 0; 625 626 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 627 ib_sa_free_multicast(mcast->mc); 628 629 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 630 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n", 631 mcast->mcmember.mgid.raw); 632 633 /* Remove ourselves from the multicast group */ 634 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid, 635 be16_to_cpu(mcast->mcmember.mlid)); 636 if (ret) 637 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret); 638 } 639 640 return 0; 641 } 642 643 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb) 644 { 645 struct ipoib_dev_priv *priv = netdev_priv(dev); 646 struct ipoib_mcast *mcast; 647 unsigned long flags; 648 void *mgid = daddr + 4; 649 650 spin_lock_irqsave(&priv->lock, flags); 651 652 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) || 653 !priv->broadcast || 654 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 655 ++dev->stats.tx_dropped; 656 dev_kfree_skb_any(skb); 657 goto unlock; 658 } 659 660 mcast = __ipoib_mcast_find(dev, mgid); 661 if (!mcast) { 662 /* Let's create a new send only group now */ 663 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n", 664 mgid); 665 666 mcast = ipoib_mcast_alloc(dev, 0); 667 if (!mcast) { 668 ipoib_warn(priv, "unable to allocate memory for " 669 "multicast structure\n"); 670 ++dev->stats.tx_dropped; 671 dev_kfree_skb_any(skb); 672 goto out; 673 } 674 675 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags); 676 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid)); 677 __ipoib_mcast_add(dev, mcast); 678 list_add_tail(&mcast->list, &priv->multicast_list); 679 } 680 681 if (!mcast->ah) { 682 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) 683 skb_queue_tail(&mcast->pkt_queue, skb); 684 else { 685 ++dev->stats.tx_dropped; 686 dev_kfree_skb_any(skb); 687 } 688 689 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 690 ipoib_dbg_mcast(priv, "no address vector, " 691 "but multicast join already started\n"); 692 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) 693 ipoib_mcast_sendonly_join(mcast); 694 695 /* 696 * If lookup completes between here and out:, don't 697 * want to send packet twice. 698 */ 699 mcast = NULL; 700 } 701 702 out: 703 if (mcast && mcast->ah) { 704 struct ipoib_neigh *neigh; 705 706 spin_unlock_irqrestore(&priv->lock, flags); 707 neigh = ipoib_neigh_get(dev, daddr); 708 spin_lock_irqsave(&priv->lock, flags); 709 if (!neigh) { 710 spin_unlock_irqrestore(&priv->lock, flags); 711 neigh = ipoib_neigh_alloc(daddr, dev); 712 spin_lock_irqsave(&priv->lock, flags); 713 if (neigh) { 714 kref_get(&mcast->ah->ref); 715 neigh->ah = mcast->ah; 716 list_add_tail(&neigh->list, &mcast->neigh_list); 717 } 718 } 719 spin_unlock_irqrestore(&priv->lock, flags); 720 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN); 721 if (neigh) 722 ipoib_neigh_put(neigh); 723 return; 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 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast) 762 { 763 /* reserved QPN, prefix, scope */ 764 if (memcmp(addr, broadcast, 6)) 765 return 0; 766 /* signature lower, pkey */ 767 if (memcmp(addr + 7, broadcast + 7, 3)) 768 return 0; 769 return 1; 770 } 771 772 void ipoib_mcast_restart_task(struct work_struct *work) 773 { 774 struct ipoib_dev_priv *priv = 775 container_of(work, struct ipoib_dev_priv, restart_task); 776 struct net_device *dev = priv->dev; 777 struct netdev_hw_addr *ha; 778 struct ipoib_mcast *mcast, *tmcast; 779 LIST_HEAD(remove_list); 780 unsigned long flags; 781 struct ib_sa_mcmember_rec rec; 782 783 ipoib_dbg_mcast(priv, "restarting multicast task\n"); 784 785 ipoib_mcast_stop_thread(dev, 0); 786 787 local_irq_save(flags); 788 netif_addr_lock(dev); 789 spin_lock(&priv->lock); 790 791 /* 792 * Unfortunately, the networking core only gives us a list of all of 793 * the multicast hardware addresses. We need to figure out which ones 794 * are new and which ones have been removed 795 */ 796 797 /* Clear out the found flag */ 798 list_for_each_entry(mcast, &priv->multicast_list, list) 799 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 800 801 /* Mark all of the entries that are found or don't exist */ 802 netdev_for_each_mc_addr(ha, dev) { 803 union ib_gid mgid; 804 805 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast)) 806 continue; 807 808 memcpy(mgid.raw, ha->addr + 4, sizeof mgid); 809 810 mcast = __ipoib_mcast_find(dev, &mgid); 811 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 812 struct ipoib_mcast *nmcast; 813 814 /* ignore group which is directly joined by userspace */ 815 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) && 816 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) { 817 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n", 818 mgid.raw); 819 continue; 820 } 821 822 /* Not found or send-only group, let's add a new entry */ 823 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n", 824 mgid.raw); 825 826 nmcast = ipoib_mcast_alloc(dev, 0); 827 if (!nmcast) { 828 ipoib_warn(priv, "unable to allocate memory for multicast structure\n"); 829 continue; 830 } 831 832 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags); 833 834 nmcast->mcmember.mgid = mgid; 835 836 if (mcast) { 837 /* Destroy the send only entry */ 838 list_move_tail(&mcast->list, &remove_list); 839 840 rb_replace_node(&mcast->rb_node, 841 &nmcast->rb_node, 842 &priv->multicast_tree); 843 } else 844 __ipoib_mcast_add(dev, nmcast); 845 846 list_add_tail(&nmcast->list, &priv->multicast_list); 847 } 848 849 if (mcast) 850 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 851 } 852 853 /* Remove all of the entries don't exist anymore */ 854 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 855 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) && 856 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 857 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n", 858 mcast->mcmember.mgid.raw); 859 860 rb_erase(&mcast->rb_node, &priv->multicast_tree); 861 862 /* Move to the remove list */ 863 list_move_tail(&mcast->list, &remove_list); 864 } 865 } 866 867 spin_unlock(&priv->lock); 868 netif_addr_unlock(dev); 869 local_irq_restore(flags); 870 871 /* We have to cancel outside of the spinlock */ 872 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 873 ipoib_mcast_leave(mcast->dev, mcast); 874 ipoib_mcast_free(mcast); 875 } 876 877 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 878 ipoib_mcast_start_thread(dev); 879 } 880 881 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 882 883 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev) 884 { 885 struct ipoib_mcast_iter *iter; 886 887 iter = kmalloc(sizeof *iter, GFP_KERNEL); 888 if (!iter) 889 return NULL; 890 891 iter->dev = dev; 892 memset(iter->mgid.raw, 0, 16); 893 894 if (ipoib_mcast_iter_next(iter)) { 895 kfree(iter); 896 return NULL; 897 } 898 899 return iter; 900 } 901 902 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter) 903 { 904 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 905 struct rb_node *n; 906 struct ipoib_mcast *mcast; 907 int ret = 1; 908 909 spin_lock_irq(&priv->lock); 910 911 n = rb_first(&priv->multicast_tree); 912 913 while (n) { 914 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 915 916 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw, 917 sizeof (union ib_gid)) < 0) { 918 iter->mgid = mcast->mcmember.mgid; 919 iter->created = mcast->created; 920 iter->queuelen = skb_queue_len(&mcast->pkt_queue); 921 iter->complete = !!mcast->ah; 922 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY)); 923 924 ret = 0; 925 926 break; 927 } 928 929 n = rb_next(n); 930 } 931 932 spin_unlock_irq(&priv->lock); 933 934 return ret; 935 } 936 937 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter, 938 union ib_gid *mgid, 939 unsigned long *created, 940 unsigned int *queuelen, 941 unsigned int *complete, 942 unsigned int *send_only) 943 { 944 *mgid = iter->mgid; 945 *created = iter->created; 946 *queuelen = iter->queuelen; 947 *complete = iter->complete; 948 *send_only = iter->send_only; 949 } 950 951 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 952