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 multicast MTU and cached Q_Key before we attach if it's 179 * the broadcast group. 180 */ 181 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 182 sizeof (union ib_gid))) { 183 spin_lock_irq(&priv->lock); 184 if (!priv->broadcast) { 185 spin_unlock_irq(&priv->lock); 186 return -EAGAIN; 187 } 188 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu)); 189 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey); 190 spin_unlock_irq(&priv->lock); 191 priv->tx_wr.wr.ud.remote_qkey = priv->qkey; 192 set_qkey = 1; 193 } 194 195 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 196 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 197 ipoib_warn(priv, "multicast group %pI6 already attached\n", 198 mcast->mcmember.mgid.raw); 199 200 return 0; 201 } 202 203 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid), 204 &mcast->mcmember.mgid, set_qkey); 205 if (ret < 0) { 206 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n", 207 mcast->mcmember.mgid.raw); 208 209 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags); 210 return ret; 211 } 212 } 213 214 { 215 struct ib_ah_attr av = { 216 .dlid = be16_to_cpu(mcast->mcmember.mlid), 217 .port_num = priv->port, 218 .sl = mcast->mcmember.sl, 219 .ah_flags = IB_AH_GRH, 220 .static_rate = mcast->mcmember.rate, 221 .grh = { 222 .flow_label = be32_to_cpu(mcast->mcmember.flow_label), 223 .hop_limit = mcast->mcmember.hop_limit, 224 .sgid_index = 0, 225 .traffic_class = mcast->mcmember.traffic_class 226 } 227 }; 228 av.grh.dgid = mcast->mcmember.mgid; 229 230 ah = ipoib_create_ah(dev, priv->pd, &av); 231 if (IS_ERR(ah)) { 232 ipoib_warn(priv, "ib_address_create failed %ld\n", 233 -PTR_ERR(ah)); 234 /* use original error */ 235 return PTR_ERR(ah); 236 } else { 237 spin_lock_irq(&priv->lock); 238 mcast->ah = ah; 239 spin_unlock_irq(&priv->lock); 240 241 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n", 242 mcast->mcmember.mgid.raw, 243 mcast->ah->ah, 244 be16_to_cpu(mcast->mcmember.mlid), 245 mcast->mcmember.sl); 246 } 247 } 248 249 /* actually send any queued packets */ 250 netif_tx_lock_bh(dev); 251 while (!skb_queue_empty(&mcast->pkt_queue)) { 252 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue); 253 254 netif_tx_unlock_bh(dev); 255 256 skb->dev = dev; 257 if (dev_queue_xmit(skb)) 258 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n"); 259 260 netif_tx_lock_bh(dev); 261 } 262 netif_tx_unlock_bh(dev); 263 264 return 0; 265 } 266 267 static int 268 ipoib_mcast_sendonly_join_complete(int status, 269 struct ib_sa_multicast *multicast) 270 { 271 struct ipoib_mcast *mcast = multicast->context; 272 struct net_device *dev = mcast->dev; 273 274 /* 275 * We have to take the mutex to force mcast_sendonly_join to 276 * return from ib_sa_multicast_join and set mcast->mc to a 277 * valid value. Otherwise we were racing with ourselves in 278 * that we might fail here, but get a valid return from 279 * ib_sa_multicast_join after we had cleared mcast->mc here, 280 * resulting in mis-matched joins and leaves and a deadlock 281 */ 282 mutex_lock(&mcast_mutex); 283 284 /* We trap for port events ourselves. */ 285 if (status == -ENETRESET) 286 goto out; 287 288 if (!status) 289 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 290 291 if (status) { 292 if (mcast->logcount++ < 20) 293 ipoib_dbg_mcast(netdev_priv(dev), "sendonly multicast " 294 "join failed for %pI6, status %d\n", 295 mcast->mcmember.mgid.raw, status); 296 297 /* Flush out any queued packets */ 298 netif_tx_lock_bh(dev); 299 while (!skb_queue_empty(&mcast->pkt_queue)) { 300 ++dev->stats.tx_dropped; 301 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 302 } 303 netif_tx_unlock_bh(dev); 304 } 305 out: 306 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 307 if (status) 308 mcast->mc = NULL; 309 complete(&mcast->done); 310 if (status == -ENETRESET) 311 status = 0; 312 mutex_unlock(&mcast_mutex); 313 return status; 314 } 315 316 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast) 317 { 318 struct net_device *dev = mcast->dev; 319 struct ipoib_dev_priv *priv = netdev_priv(dev); 320 struct ib_sa_mcmember_rec rec = { 321 #if 0 /* Some SMs don't support send-only yet */ 322 .join_state = 4 323 #else 324 .join_state = 1 325 #endif 326 }; 327 int ret = 0; 328 329 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 330 ipoib_dbg_mcast(priv, "device shutting down, no sendonly " 331 "multicast joins\n"); 332 return -ENODEV; 333 } 334 335 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) { 336 ipoib_dbg_mcast(priv, "multicast entry busy, skipping " 337 "sendonly join\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 mutex_lock(&mcast_mutex); 346 init_completion(&mcast->done); 347 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 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 complete(&mcast->done); 361 ipoib_warn(priv, "ib_sa_join_multicast for sendonly join " 362 "failed (ret = %d)\n", ret); 363 } else { 364 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting " 365 "sendonly join\n", mcast->mcmember.mgid.raw); 366 } 367 mutex_unlock(&mcast_mutex); 368 369 return ret; 370 } 371 372 void ipoib_mcast_carrier_on_task(struct work_struct *work) 373 { 374 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 375 carrier_on_task); 376 struct ib_port_attr attr; 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 /* 385 * Take rtnl_lock to avoid racing with ipoib_stop() and 386 * turning the carrier back on while a device is being 387 * removed. However, ipoib_stop() will attempt to flush 388 * the workqueue while holding the rtnl lock, so loop 389 * on trylock until either we get the lock or we see 390 * FLAG_ADMIN_UP go away as that signals that we are bailing 391 * and can safely ignore the carrier on work. 392 */ 393 while (!rtnl_trylock()) { 394 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 395 return; 396 else 397 msleep(20); 398 } 399 if (!ipoib_cm_admin_enabled(priv->dev)) 400 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu)); 401 netif_carrier_on(priv->dev); 402 rtnl_unlock(); 403 } 404 405 static int ipoib_mcast_join_complete(int status, 406 struct ib_sa_multicast *multicast) 407 { 408 struct ipoib_mcast *mcast = multicast->context; 409 struct net_device *dev = mcast->dev; 410 struct ipoib_dev_priv *priv = netdev_priv(dev); 411 412 ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n", 413 mcast->mcmember.mgid.raw, status); 414 415 /* 416 * We have to take the mutex to force mcast_join to 417 * return from ib_sa_multicast_join and set mcast->mc to a 418 * valid value. Otherwise we were racing with ourselves in 419 * that we might fail here, but get a valid return from 420 * ib_sa_multicast_join after we had cleared mcast->mc here, 421 * resulting in mis-matched joins and leaves and a deadlock 422 */ 423 mutex_lock(&mcast_mutex); 424 425 /* We trap for port events ourselves. */ 426 if (status == -ENETRESET) 427 goto out; 428 429 if (!status) 430 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 431 432 if (!status) { 433 mcast->backoff = 1; 434 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 435 queue_delayed_work(priv->wq, &priv->mcast_task, 0); 436 437 /* 438 * Defer carrier on work to priv->wq to avoid a 439 * deadlock on rtnl_lock here. 440 */ 441 if (mcast == priv->broadcast) 442 queue_work(priv->wq, &priv->carrier_on_task); 443 } else { 444 if (mcast->logcount++ < 20) { 445 if (status == -ETIMEDOUT || status == -EAGAIN) { 446 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n", 447 mcast->mcmember.mgid.raw, status); 448 } else { 449 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n", 450 mcast->mcmember.mgid.raw, status); 451 } 452 } 453 454 mcast->backoff *= 2; 455 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 456 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 457 } 458 out: 459 spin_lock_irq(&priv->lock); 460 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 461 if (status) 462 mcast->mc = NULL; 463 complete(&mcast->done); 464 if (status == -ENETRESET) 465 status = 0; 466 if (status && test_bit(IPOIB_MCAST_RUN, &priv->flags)) 467 queue_delayed_work(priv->wq, &priv->mcast_task, 468 mcast->backoff * HZ); 469 spin_unlock_irq(&priv->lock); 470 mutex_unlock(&mcast_mutex); 471 472 return status; 473 } 474 475 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast, 476 int create) 477 { 478 struct ipoib_dev_priv *priv = netdev_priv(dev); 479 struct ib_sa_mcmember_rec rec = { 480 .join_state = 1 481 }; 482 ib_sa_comp_mask comp_mask; 483 int ret = 0; 484 485 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw); 486 487 rec.mgid = mcast->mcmember.mgid; 488 rec.port_gid = priv->local_gid; 489 rec.pkey = cpu_to_be16(priv->pkey); 490 491 comp_mask = 492 IB_SA_MCMEMBER_REC_MGID | 493 IB_SA_MCMEMBER_REC_PORT_GID | 494 IB_SA_MCMEMBER_REC_PKEY | 495 IB_SA_MCMEMBER_REC_JOIN_STATE; 496 497 if (create) { 498 comp_mask |= 499 IB_SA_MCMEMBER_REC_QKEY | 500 IB_SA_MCMEMBER_REC_MTU_SELECTOR | 501 IB_SA_MCMEMBER_REC_MTU | 502 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS | 503 IB_SA_MCMEMBER_REC_RATE_SELECTOR | 504 IB_SA_MCMEMBER_REC_RATE | 505 IB_SA_MCMEMBER_REC_SL | 506 IB_SA_MCMEMBER_REC_FLOW_LABEL | 507 IB_SA_MCMEMBER_REC_HOP_LIMIT; 508 509 rec.qkey = priv->broadcast->mcmember.qkey; 510 rec.mtu_selector = IB_SA_EQ; 511 rec.mtu = priv->broadcast->mcmember.mtu; 512 rec.traffic_class = priv->broadcast->mcmember.traffic_class; 513 rec.rate_selector = IB_SA_EQ; 514 rec.rate = priv->broadcast->mcmember.rate; 515 rec.sl = priv->broadcast->mcmember.sl; 516 rec.flow_label = priv->broadcast->mcmember.flow_label; 517 rec.hop_limit = priv->broadcast->mcmember.hop_limit; 518 } 519 520 mutex_lock(&mcast_mutex); 521 init_completion(&mcast->done); 522 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 523 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port, 524 &rec, comp_mask, GFP_KERNEL, 525 ipoib_mcast_join_complete, mcast); 526 if (IS_ERR(mcast->mc)) { 527 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 528 complete(&mcast->done); 529 ret = PTR_ERR(mcast->mc); 530 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret); 531 532 mcast->backoff *= 2; 533 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 534 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 535 536 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 537 queue_delayed_work(priv->wq, &priv->mcast_task, 538 mcast->backoff * HZ); 539 } 540 mutex_unlock(&mcast_mutex); 541 } 542 543 void ipoib_mcast_join_task(struct work_struct *work) 544 { 545 struct ipoib_dev_priv *priv = 546 container_of(work, struct ipoib_dev_priv, mcast_task.work); 547 struct net_device *dev = priv->dev; 548 struct ib_port_attr port_attr; 549 550 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags)) 551 return; 552 553 if (ib_query_port(priv->ca, priv->port, &port_attr) || 554 port_attr.state != IB_PORT_ACTIVE) { 555 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n", 556 port_attr.state); 557 return; 558 } 559 priv->local_lid = port_attr.lid; 560 561 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid)) 562 ipoib_warn(priv, "ib_query_gid() failed\n"); 563 else 564 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 565 566 if (!priv->broadcast) { 567 struct ipoib_mcast *broadcast; 568 569 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 570 return; 571 572 broadcast = ipoib_mcast_alloc(dev, 1); 573 if (!broadcast) { 574 ipoib_warn(priv, "failed to allocate broadcast group\n"); 575 mutex_lock(&mcast_mutex); 576 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) 577 queue_delayed_work(priv->wq, &priv->mcast_task, 578 HZ); 579 mutex_unlock(&mcast_mutex); 580 return; 581 } 582 583 spin_lock_irq(&priv->lock); 584 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 585 sizeof (union ib_gid)); 586 priv->broadcast = broadcast; 587 588 __ipoib_mcast_add(dev, priv->broadcast); 589 spin_unlock_irq(&priv->lock); 590 } 591 592 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 593 if (IS_ERR_OR_NULL(priv->broadcast->mc) && 594 !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) 595 ipoib_mcast_join(dev, priv->broadcast, 0); 596 return; 597 } 598 599 while (1) { 600 struct ipoib_mcast *mcast = NULL; 601 602 /* 603 * Need the mutex so our flags are consistent, need the 604 * priv->lock so we don't race with list removals in either 605 * mcast_dev_flush or mcast_restart_task 606 */ 607 mutex_lock(&mcast_mutex); 608 spin_lock_irq(&priv->lock); 609 list_for_each_entry(mcast, &priv->multicast_list, list) { 610 if (IS_ERR_OR_NULL(mcast->mc) && 611 !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) && 612 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 613 /* Found the next unjoined group */ 614 break; 615 } 616 } 617 spin_unlock_irq(&priv->lock); 618 mutex_unlock(&mcast_mutex); 619 620 if (&mcast->list == &priv->multicast_list) { 621 /* All done */ 622 break; 623 } 624 625 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) 626 ipoib_mcast_sendonly_join(mcast); 627 else 628 ipoib_mcast_join(dev, mcast, 1); 629 return; 630 } 631 632 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n"); 633 634 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 635 } 636 637 int ipoib_mcast_start_thread(struct net_device *dev) 638 { 639 struct ipoib_dev_priv *priv = netdev_priv(dev); 640 641 ipoib_dbg_mcast(priv, "starting multicast thread\n"); 642 643 mutex_lock(&mcast_mutex); 644 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags)) 645 queue_delayed_work(priv->wq, &priv->mcast_task, 0); 646 mutex_unlock(&mcast_mutex); 647 648 return 0; 649 } 650 651 int ipoib_mcast_stop_thread(struct net_device *dev) 652 { 653 struct ipoib_dev_priv *priv = netdev_priv(dev); 654 655 ipoib_dbg_mcast(priv, "stopping multicast thread\n"); 656 657 mutex_lock(&mcast_mutex); 658 clear_bit(IPOIB_MCAST_RUN, &priv->flags); 659 cancel_delayed_work(&priv->mcast_task); 660 mutex_unlock(&mcast_mutex); 661 662 flush_workqueue(priv->wq); 663 664 return 0; 665 } 666 667 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast) 668 { 669 struct ipoib_dev_priv *priv = netdev_priv(dev); 670 int ret = 0; 671 672 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 673 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n"); 674 675 if (!IS_ERR_OR_NULL(mcast->mc)) 676 ib_sa_free_multicast(mcast->mc); 677 678 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 679 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n", 680 mcast->mcmember.mgid.raw); 681 682 /* Remove ourselves from the multicast group */ 683 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid, 684 be16_to_cpu(mcast->mcmember.mlid)); 685 if (ret) 686 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret); 687 } 688 689 return 0; 690 } 691 692 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb) 693 { 694 struct ipoib_dev_priv *priv = netdev_priv(dev); 695 struct ipoib_mcast *mcast; 696 unsigned long flags; 697 void *mgid = daddr + 4; 698 699 spin_lock_irqsave(&priv->lock, flags); 700 701 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) || 702 !priv->broadcast || 703 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 704 ++dev->stats.tx_dropped; 705 dev_kfree_skb_any(skb); 706 goto unlock; 707 } 708 709 mcast = __ipoib_mcast_find(dev, mgid); 710 if (!mcast) { 711 /* Let's create a new send only group now */ 712 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n", 713 mgid); 714 715 mcast = ipoib_mcast_alloc(dev, 0); 716 if (!mcast) { 717 ipoib_warn(priv, "unable to allocate memory for " 718 "multicast structure\n"); 719 ++dev->stats.tx_dropped; 720 dev_kfree_skb_any(skb); 721 goto out; 722 } 723 724 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags); 725 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid)); 726 __ipoib_mcast_add(dev, mcast); 727 list_add_tail(&mcast->list, &priv->multicast_list); 728 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags)) 729 queue_delayed_work(priv->wq, &priv->mcast_task, 0); 730 } 731 732 if (!mcast->ah) { 733 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) 734 skb_queue_tail(&mcast->pkt_queue, skb); 735 else { 736 ++dev->stats.tx_dropped; 737 dev_kfree_skb_any(skb); 738 } 739 740 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 741 ipoib_dbg_mcast(priv, "no address vector, " 742 "but multicast join already started\n"); 743 744 /* 745 * If lookup completes between here and out:, don't 746 * want to send packet twice. 747 */ 748 mcast = NULL; 749 } 750 751 out: 752 if (mcast && mcast->ah) { 753 struct ipoib_neigh *neigh; 754 755 spin_unlock_irqrestore(&priv->lock, flags); 756 neigh = ipoib_neigh_get(dev, daddr); 757 spin_lock_irqsave(&priv->lock, flags); 758 if (!neigh) { 759 neigh = ipoib_neigh_alloc(daddr, dev); 760 if (neigh) { 761 kref_get(&mcast->ah->ref); 762 neigh->ah = mcast->ah; 763 list_add_tail(&neigh->list, &mcast->neigh_list); 764 } 765 } 766 spin_unlock_irqrestore(&priv->lock, flags); 767 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN); 768 if (neigh) 769 ipoib_neigh_put(neigh); 770 return; 771 } 772 773 unlock: 774 spin_unlock_irqrestore(&priv->lock, flags); 775 } 776 777 void ipoib_mcast_dev_flush(struct net_device *dev) 778 { 779 struct ipoib_dev_priv *priv = netdev_priv(dev); 780 LIST_HEAD(remove_list); 781 struct ipoib_mcast *mcast, *tmcast; 782 unsigned long flags; 783 784 ipoib_dbg_mcast(priv, "flushing multicast list\n"); 785 786 spin_lock_irqsave(&priv->lock, flags); 787 788 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 789 list_del(&mcast->list); 790 rb_erase(&mcast->rb_node, &priv->multicast_tree); 791 list_add_tail(&mcast->list, &remove_list); 792 } 793 794 if (priv->broadcast) { 795 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree); 796 list_add_tail(&priv->broadcast->list, &remove_list); 797 priv->broadcast = NULL; 798 } 799 800 spin_unlock_irqrestore(&priv->lock, flags); 801 802 /* 803 * make sure the in-flight joins have finished before we attempt 804 * to leave 805 */ 806 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) 807 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 808 wait_for_completion(&mcast->done); 809 810 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 811 ipoib_mcast_leave(dev, mcast); 812 ipoib_mcast_free(mcast); 813 } 814 } 815 816 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast) 817 { 818 /* reserved QPN, prefix, scope */ 819 if (memcmp(addr, broadcast, 6)) 820 return 0; 821 /* signature lower, pkey */ 822 if (memcmp(addr + 7, broadcast + 7, 3)) 823 return 0; 824 return 1; 825 } 826 827 void ipoib_mcast_restart_task(struct work_struct *work) 828 { 829 struct ipoib_dev_priv *priv = 830 container_of(work, struct ipoib_dev_priv, restart_task); 831 struct net_device *dev = priv->dev; 832 struct netdev_hw_addr *ha; 833 struct ipoib_mcast *mcast, *tmcast; 834 LIST_HEAD(remove_list); 835 unsigned long flags; 836 struct ib_sa_mcmember_rec rec; 837 838 ipoib_dbg_mcast(priv, "restarting multicast task\n"); 839 840 local_irq_save(flags); 841 netif_addr_lock(dev); 842 spin_lock(&priv->lock); 843 844 /* 845 * Unfortunately, the networking core only gives us a list of all of 846 * the multicast hardware addresses. We need to figure out which ones 847 * are new and which ones have been removed 848 */ 849 850 /* Clear out the found flag */ 851 list_for_each_entry(mcast, &priv->multicast_list, list) 852 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 853 854 /* Mark all of the entries that are found or don't exist */ 855 netdev_for_each_mc_addr(ha, dev) { 856 union ib_gid mgid; 857 858 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast)) 859 continue; 860 861 memcpy(mgid.raw, ha->addr + 4, sizeof mgid); 862 863 mcast = __ipoib_mcast_find(dev, &mgid); 864 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 865 struct ipoib_mcast *nmcast; 866 867 /* ignore group which is directly joined by userspace */ 868 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) && 869 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) { 870 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n", 871 mgid.raw); 872 continue; 873 } 874 875 /* Not found or send-only group, let's add a new entry */ 876 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n", 877 mgid.raw); 878 879 nmcast = ipoib_mcast_alloc(dev, 0); 880 if (!nmcast) { 881 ipoib_warn(priv, "unable to allocate memory for multicast structure\n"); 882 continue; 883 } 884 885 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags); 886 887 nmcast->mcmember.mgid = mgid; 888 889 if (mcast) { 890 /* Destroy the send only entry */ 891 list_move_tail(&mcast->list, &remove_list); 892 893 rb_replace_node(&mcast->rb_node, 894 &nmcast->rb_node, 895 &priv->multicast_tree); 896 } else 897 __ipoib_mcast_add(dev, nmcast); 898 899 list_add_tail(&nmcast->list, &priv->multicast_list); 900 } 901 902 if (mcast) 903 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 904 } 905 906 /* Remove all of the entries don't exist anymore */ 907 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 908 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) && 909 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 910 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n", 911 mcast->mcmember.mgid.raw); 912 913 rb_erase(&mcast->rb_node, &priv->multicast_tree); 914 915 /* Move to the remove list */ 916 list_move_tail(&mcast->list, &remove_list); 917 } 918 } 919 920 spin_unlock(&priv->lock); 921 netif_addr_unlock(dev); 922 local_irq_restore(flags); 923 924 /* 925 * make sure the in-flight joins have finished before we attempt 926 * to leave 927 */ 928 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) 929 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 930 wait_for_completion(&mcast->done); 931 932 /* 933 * We have to cancel outside of the spinlock, but we have to 934 * take the rtnl lock or else we race with the removal of 935 * entries from the remove list in mcast_dev_flush as part 936 * of ipoib_stop(). We detect the drop of the ADMIN_UP flag 937 * to signal that we have hit this particular race, and we 938 * return since we know we don't need to do anything else 939 * anyway. 940 */ 941 while (!rtnl_trylock()) { 942 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 943 return; 944 else 945 msleep(20); 946 } 947 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) { 948 ipoib_mcast_leave(mcast->dev, mcast); 949 ipoib_mcast_free(mcast); 950 } 951 /* 952 * Restart our join task if needed 953 */ 954 ipoib_mcast_start_thread(dev); 955 rtnl_unlock(); 956 } 957 958 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 959 960 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev) 961 { 962 struct ipoib_mcast_iter *iter; 963 964 iter = kmalloc(sizeof *iter, GFP_KERNEL); 965 if (!iter) 966 return NULL; 967 968 iter->dev = dev; 969 memset(iter->mgid.raw, 0, 16); 970 971 if (ipoib_mcast_iter_next(iter)) { 972 kfree(iter); 973 return NULL; 974 } 975 976 return iter; 977 } 978 979 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter) 980 { 981 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 982 struct rb_node *n; 983 struct ipoib_mcast *mcast; 984 int ret = 1; 985 986 spin_lock_irq(&priv->lock); 987 988 n = rb_first(&priv->multicast_tree); 989 990 while (n) { 991 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 992 993 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw, 994 sizeof (union ib_gid)) < 0) { 995 iter->mgid = mcast->mcmember.mgid; 996 iter->created = mcast->created; 997 iter->queuelen = skb_queue_len(&mcast->pkt_queue); 998 iter->complete = !!mcast->ah; 999 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY)); 1000 1001 ret = 0; 1002 1003 break; 1004 } 1005 1006 n = rb_next(n); 1007 } 1008 1009 spin_unlock_irq(&priv->lock); 1010 1011 return ret; 1012 } 1013 1014 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter, 1015 union ib_gid *mgid, 1016 unsigned long *created, 1017 unsigned int *queuelen, 1018 unsigned int *complete, 1019 unsigned int *send_only) 1020 { 1021 *mgid = iter->mgid; 1022 *created = iter->created; 1023 *queuelen = iter->queuelen; 1024 *complete = iter->complete; 1025 *send_only = iter->send_only; 1026 } 1027 1028 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 1029