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 51static int mcast_debug_level; 52 53module_param(mcast_debug_level, int, 0644); 54MODULE_PARM_DESC(mcast_debug_level, 55 "Enable multicast debug tracing if > 0"); 56#endif 57 58struct ipoib_mcast_iter { 59 struct net_device *dev; 60 union ib_gid mgid; 61 unsigned long created; 62 unsigned int queuelen; 63 unsigned int complete; 64 unsigned int send_only; 65}; 66 67/* join state that allows creating mcg with sendonly member request */ 68#define SENDONLY_FULLMEMBER_JOIN 8 69 70/* 71 * This should be called with the priv->lock held 72 */ 73static void __ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv *priv, 74 struct ipoib_mcast *mcast, 75 bool delay) 76{ 77 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) 78 return; 79 80 /* 81 * We will be scheduling *something*, so cancel whatever is 82 * currently scheduled first 83 */ 84 cancel_delayed_work(&priv->mcast_task); 85 if (mcast && delay) { 86 /* 87 * We had a failure and want to schedule a retry later 88 */ 89 mcast->backoff *= 2; 90 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS) 91 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS; 92 mcast->delay_until = jiffies + (mcast->backoff * HZ); 93 /* 94 * Mark this mcast for its delay, but restart the 95 * task immediately. The join task will make sure to 96 * clear out all entries without delays, and then 97 * schedule itself to run again when the earliest 98 * delay expires 99 */ 100 queue_delayed_work(priv->wq, &priv->mcast_task, 0); 101 } else if (delay) { 102 /* 103 * Special case of retrying after a failure to 104 * allocate the broadcast multicast group, wait 105 * 1 second and try again 106 */ 107 queue_delayed_work(priv->wq, &priv->mcast_task, HZ); 108 } else 109 queue_delayed_work(priv->wq, &priv->mcast_task, 0); 110} 111 112static void ipoib_mcast_free(struct ipoib_mcast *mcast) 113{ 114 struct net_device *dev = mcast->dev; 115 int tx_dropped = 0; 116 117 ipoib_dbg_mcast(ipoib_priv(dev), "deleting multicast group %pI6\n", 118 mcast->mcmember.mgid.raw); 119 120 /* remove all neigh connected to this mcast */ 121 ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw); 122 123 if (mcast->ah) 124 ipoib_put_ah(mcast->ah); 125 126 while (!skb_queue_empty(&mcast->pkt_queue)) { 127 ++tx_dropped; 128 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 129 } 130 131 netif_tx_lock_bh(dev); 132 dev->stats.tx_dropped += tx_dropped; 133 netif_tx_unlock_bh(dev); 134 135 kfree(mcast); 136} 137 138static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev) 139{ 140 struct ipoib_mcast *mcast; 141 142 mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC); 143 if (!mcast) 144 return NULL; 145 146 mcast->dev = dev; 147 mcast->created = jiffies; 148 mcast->delay_until = jiffies; 149 mcast->backoff = 1; 150 151 INIT_LIST_HEAD(&mcast->list); 152 INIT_LIST_HEAD(&mcast->neigh_list); 153 skb_queue_head_init(&mcast->pkt_queue); 154 155 return mcast; 156} 157 158static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid) 159{ 160 struct ipoib_dev_priv *priv = ipoib_priv(dev); 161 struct rb_node *n = priv->multicast_tree.rb_node; 162 163 while (n) { 164 struct ipoib_mcast *mcast; 165 int ret; 166 167 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 168 169 ret = memcmp(mgid, mcast->mcmember.mgid.raw, 170 sizeof (union ib_gid)); 171 if (ret < 0) 172 n = n->rb_left; 173 else if (ret > 0) 174 n = n->rb_right; 175 else 176 return mcast; 177 } 178 179 return NULL; 180} 181 182static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast) 183{ 184 struct ipoib_dev_priv *priv = ipoib_priv(dev); 185 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL; 186 187 while (*n) { 188 struct ipoib_mcast *tmcast; 189 int ret; 190 191 pn = *n; 192 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node); 193 194 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw, 195 sizeof (union ib_gid)); 196 if (ret < 0) 197 n = &pn->rb_left; 198 else if (ret > 0) 199 n = &pn->rb_right; 200 else 201 return -EEXIST; 202 } 203 204 rb_link_node(&mcast->rb_node, pn, n); 205 rb_insert_color(&mcast->rb_node, &priv->multicast_tree); 206 207 return 0; 208} 209 210static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast, 211 struct ib_sa_mcmember_rec *mcmember) 212{ 213 struct net_device *dev = mcast->dev; 214 struct ipoib_dev_priv *priv = ipoib_priv(dev); 215 struct rdma_netdev *rn = netdev_priv(dev); 216 struct ipoib_ah *ah; 217 struct rdma_ah_attr av; 218 int ret; 219 int set_qkey = 0; 220 int mtu; 221 222 mcast->mcmember = *mcmember; 223 224 /* Set the multicast MTU and cached Q_Key before we attach if it's 225 * the broadcast group. 226 */ 227 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 228 sizeof (union ib_gid))) { 229 spin_lock_irq(&priv->lock); 230 if (!priv->broadcast) { 231 spin_unlock_irq(&priv->lock); 232 return -EAGAIN; 233 } 234 /*update priv member according to the new mcast*/ 235 priv->broadcast->mcmember.qkey = mcmember->qkey; 236 priv->broadcast->mcmember.mtu = mcmember->mtu; 237 priv->broadcast->mcmember.traffic_class = mcmember->traffic_class; 238 priv->broadcast->mcmember.rate = mcmember->rate; 239 priv->broadcast->mcmember.sl = mcmember->sl; 240 priv->broadcast->mcmember.flow_label = mcmember->flow_label; 241 priv->broadcast->mcmember.hop_limit = mcmember->hop_limit; 242 /* assume if the admin and the mcast are the same both can be changed */ 243 mtu = rdma_mtu_enum_to_int(priv->ca, priv->port, 244 priv->broadcast->mcmember.mtu); 245 if (priv->mcast_mtu == priv->admin_mtu) 246 priv->admin_mtu = IPOIB_UD_MTU(mtu); 247 priv->mcast_mtu = IPOIB_UD_MTU(mtu); 248 rn->mtu = priv->mcast_mtu; 249 250 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey); 251 spin_unlock_irq(&priv->lock); 252 priv->tx_wr.remote_qkey = priv->qkey; 253 set_qkey = 1; 254 } 255 256 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 257 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 258 ipoib_warn(priv, "multicast group %pI6 already attached\n", 259 mcast->mcmember.mgid.raw); 260 261 return 0; 262 } 263 264 ret = rn->attach_mcast(dev, priv->ca, &mcast->mcmember.mgid, 265 be16_to_cpu(mcast->mcmember.mlid), 266 set_qkey, priv->qkey); 267 if (ret < 0) { 268 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n", 269 mcast->mcmember.mgid.raw); 270 271 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags); 272 return ret; 273 } 274 } 275 276 memset(&av, 0, sizeof(av)); 277 av.type = rdma_ah_find_type(priv->ca, priv->port); 278 rdma_ah_set_dlid(&av, be16_to_cpu(mcast->mcmember.mlid)); 279 rdma_ah_set_port_num(&av, priv->port); 280 rdma_ah_set_sl(&av, mcast->mcmember.sl); 281 rdma_ah_set_static_rate(&av, mcast->mcmember.rate); 282 283 rdma_ah_set_grh(&av, &mcast->mcmember.mgid, 284 be32_to_cpu(mcast->mcmember.flow_label), 285 0, mcast->mcmember.hop_limit, 286 mcast->mcmember.traffic_class); 287 288 ah = ipoib_create_ah(dev, priv->pd, &av); 289 if (IS_ERR(ah)) { 290 ipoib_warn(priv, "ib_address_create failed %pe\n", ah); 291 /* use original error */ 292 return PTR_ERR(ah); 293 } 294 spin_lock_irq(&priv->lock); 295 mcast->ah = ah; 296 spin_unlock_irq(&priv->lock); 297 298 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n", 299 mcast->mcmember.mgid.raw, 300 mcast->ah->ah, 301 be16_to_cpu(mcast->mcmember.mlid), 302 mcast->mcmember.sl); 303 304 /* actually send any queued packets */ 305 netif_tx_lock_bh(dev); 306 while (!skb_queue_empty(&mcast->pkt_queue)) { 307 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue); 308 309 netif_tx_unlock_bh(dev); 310 311 skb->dev = dev; 312 313 ret = dev_queue_xmit(skb); 314 if (ret) 315 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n", 316 __func__, ret); 317 netif_tx_lock_bh(dev); 318 } 319 netif_tx_unlock_bh(dev); 320 321 return 0; 322} 323 324void ipoib_mcast_carrier_on_task(struct work_struct *work) 325{ 326 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, 327 carrier_on_task); 328 struct ib_port_attr attr; 329 330 if (ib_query_port(priv->ca, priv->port, &attr) || 331 attr.state != IB_PORT_ACTIVE) { 332 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n"); 333 return; 334 } 335 /* 336 * Take rtnl_lock to avoid racing with ipoib_stop() and 337 * turning the carrier back on while a device is being 338 * removed. However, ipoib_stop() will attempt to flush 339 * the workqueue while holding the rtnl lock, so loop 340 * on trylock until either we get the lock or we see 341 * FLAG_OPER_UP go away as that signals that we are bailing 342 * and can safely ignore the carrier on work. 343 */ 344 while (!rtnl_trylock()) { 345 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) 346 return; 347 else 348 msleep(20); 349 } 350 if (!ipoib_cm_admin_enabled(priv->dev)) 351 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu)); 352 netif_carrier_on(priv->dev); 353 rtnl_unlock(); 354} 355 356static int ipoib_mcast_join_complete(int status, 357 struct ib_sa_multicast *multicast) 358{ 359 struct ipoib_mcast *mcast = multicast->context; 360 struct net_device *dev = mcast->dev; 361 struct ipoib_dev_priv *priv = ipoib_priv(dev); 362 363 ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n", 364 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? 365 "sendonly " : "", 366 mcast->mcmember.mgid.raw, status); 367 368 /* We trap for port events ourselves. */ 369 if (status == -ENETRESET) { 370 status = 0; 371 goto out; 372 } 373 374 if (!status) 375 status = ipoib_mcast_join_finish(mcast, &multicast->rec); 376 377 if (!status) { 378 mcast->backoff = 1; 379 mcast->delay_until = jiffies; 380 381 /* 382 * Defer carrier on work to priv->wq to avoid a 383 * deadlock on rtnl_lock here. Requeue our multicast 384 * work too, which will end up happening right after 385 * our carrier on task work and will allow us to 386 * send out all of the non-broadcast joins 387 */ 388 if (mcast == priv->broadcast) { 389 spin_lock_irq(&priv->lock); 390 queue_work(priv->wq, &priv->carrier_on_task); 391 __ipoib_mcast_schedule_join_thread(priv, NULL, 0); 392 goto out_locked; 393 } 394 } else { 395 bool silent_fail = 396 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) && 397 status == -EINVAL; 398 399 if (mcast->logcount < 20) { 400 if (status == -ETIMEDOUT || status == -EAGAIN || 401 silent_fail) { 402 ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n", 403 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "", 404 mcast->mcmember.mgid.raw, status); 405 } else { 406 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n", 407 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "", 408 mcast->mcmember.mgid.raw, status); 409 } 410 411 if (!silent_fail) 412 mcast->logcount++; 413 } 414 415 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) && 416 mcast->backoff >= 2) { 417 /* 418 * We only retry sendonly joins once before we drop 419 * the packet and quit trying to deal with the 420 * group. However, we leave the group in the 421 * mcast list as an unjoined group. If we want to 422 * try joining again, we simply queue up a packet 423 * and restart the join thread. The empty queue 424 * is why the join thread ignores this group. 425 */ 426 mcast->backoff = 1; 427 netif_tx_lock_bh(dev); 428 while (!skb_queue_empty(&mcast->pkt_queue)) { 429 ++dev->stats.tx_dropped; 430 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue)); 431 } 432 netif_tx_unlock_bh(dev); 433 } else { 434 spin_lock_irq(&priv->lock); 435 /* Requeue this join task with a backoff delay */ 436 __ipoib_mcast_schedule_join_thread(priv, mcast, 1); 437 goto out_locked; 438 } 439 } 440out: 441 spin_lock_irq(&priv->lock); 442out_locked: 443 /* 444 * Make sure to set mcast->mc before we clear the busy flag to avoid 445 * racing with code that checks for BUSY before checking mcast->mc 446 */ 447 if (status) 448 mcast->mc = NULL; 449 else 450 mcast->mc = multicast; 451 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 452 spin_unlock_irq(&priv->lock); 453 complete(&mcast->done); 454 455 return status; 456} 457 458/* 459 * Caller must hold 'priv->lock' 460 */ 461static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast) 462{ 463 struct ipoib_dev_priv *priv = ipoib_priv(dev); 464 struct ib_sa_multicast *multicast; 465 struct ib_sa_mcmember_rec rec = { 466 .join_state = 1 467 }; 468 ib_sa_comp_mask comp_mask; 469 int ret = 0; 470 471 if (!priv->broadcast || 472 !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) 473 return -EINVAL; 474 475 init_completion(&mcast->done); 476 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 477 478 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw); 479 480 rec.mgid = mcast->mcmember.mgid; 481 rec.port_gid = priv->local_gid; 482 rec.pkey = cpu_to_be16(priv->pkey); 483 484 comp_mask = 485 IB_SA_MCMEMBER_REC_MGID | 486 IB_SA_MCMEMBER_REC_PORT_GID | 487 IB_SA_MCMEMBER_REC_PKEY | 488 IB_SA_MCMEMBER_REC_JOIN_STATE; 489 490 if (mcast != priv->broadcast) { 491 /* 492 * RFC 4391: 493 * The MGID MUST use the same P_Key, Q_Key, SL, MTU, 494 * and HopLimit as those used in the broadcast-GID. The rest 495 * of attributes SHOULD follow the values used in the 496 * broadcast-GID as well. 497 */ 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 * Send-only IB Multicast joins work at the core IB layer but 521 * require specific SM support. 522 * We can use such joins here only if the current SM supports that feature. 523 * However, if not, we emulate an Ethernet multicast send, 524 * which does not require a multicast subscription and will 525 * still send properly. The most appropriate thing to 526 * do is to create the group if it doesn't exist as that 527 * most closely emulates the behavior, from a user space 528 * application perspective, of Ethernet multicast operation. 529 */ 530 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) 531 rec.join_state = SENDONLY_FULLMEMBER_JOIN; 532 } 533 534 multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port, 535 &rec, comp_mask, GFP_ATOMIC, 536 ipoib_mcast_join_complete, mcast); 537 if (IS_ERR(multicast)) { 538 ret = PTR_ERR(multicast); 539 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret); 540 /* Requeue this join task with a backoff delay */ 541 __ipoib_mcast_schedule_join_thread(priv, mcast, 1); 542 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags); 543 complete(&mcast->done); 544 return ret; 545 } 546 return 0; 547} 548 549void ipoib_mcast_join_task(struct work_struct *work) 550{ 551 struct ipoib_dev_priv *priv = 552 container_of(work, struct ipoib_dev_priv, mcast_task.work); 553 struct net_device *dev = priv->dev; 554 struct ib_port_attr port_attr; 555 unsigned long delay_until = 0; 556 struct ipoib_mcast *mcast = NULL; 557 558 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) 559 return; 560 561 if (ib_query_port(priv->ca, priv->port, &port_attr)) { 562 ipoib_dbg(priv, "ib_query_port() failed\n"); 563 return; 564 } 565 if (port_attr.state != IB_PORT_ACTIVE) { 566 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n", 567 port_attr.state); 568 return; 569 } 570 priv->local_lid = port_attr.lid; 571 netif_addr_lock_bh(dev); 572 573 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) { 574 netif_addr_unlock_bh(dev); 575 return; 576 } 577 netif_addr_unlock_bh(dev); 578 579 spin_lock_irq(&priv->lock); 580 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) 581 goto out; 582 583 if (!priv->broadcast) { 584 struct ipoib_mcast *broadcast; 585 586 broadcast = ipoib_mcast_alloc(dev); 587 if (!broadcast) { 588 ipoib_warn(priv, "failed to allocate broadcast group\n"); 589 /* 590 * Restart us after a 1 second delay to retry 591 * creating our broadcast group and attaching to 592 * it. Until this succeeds, this ipoib dev is 593 * completely stalled (multicast wise). 594 */ 595 __ipoib_mcast_schedule_join_thread(priv, NULL, 1); 596 goto out; 597 } 598 599 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4, 600 sizeof (union ib_gid)); 601 priv->broadcast = broadcast; 602 603 __ipoib_mcast_add(dev, priv->broadcast); 604 } 605 606 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 607 if (IS_ERR_OR_NULL(priv->broadcast->mc) && 608 !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) { 609 mcast = priv->broadcast; 610 if (mcast->backoff > 1 && 611 time_before(jiffies, mcast->delay_until)) { 612 delay_until = mcast->delay_until; 613 mcast = NULL; 614 } 615 } 616 goto out; 617 } 618 619 /* 620 * We'll never get here until the broadcast group is both allocated 621 * and attached 622 */ 623 list_for_each_entry(mcast, &priv->multicast_list, list) { 624 if (IS_ERR_OR_NULL(mcast->mc) && 625 !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) && 626 (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) || 627 !skb_queue_empty(&mcast->pkt_queue))) { 628 if (mcast->backoff == 1 || 629 time_after_eq(jiffies, mcast->delay_until)) { 630 /* Found the next unjoined group */ 631 if (ipoib_mcast_join(dev, mcast)) { 632 spin_unlock_irq(&priv->lock); 633 return; 634 } 635 } else if (!delay_until || 636 time_before(mcast->delay_until, delay_until)) 637 delay_until = mcast->delay_until; 638 } 639 } 640 641 mcast = NULL; 642 ipoib_dbg_mcast(priv, "successfully started all multicast joins\n"); 643 644out: 645 if (delay_until) { 646 cancel_delayed_work(&priv->mcast_task); 647 queue_delayed_work(priv->wq, &priv->mcast_task, 648 delay_until - jiffies); 649 } 650 if (mcast) 651 ipoib_mcast_join(dev, mcast); 652 653 spin_unlock_irq(&priv->lock); 654} 655 656void ipoib_mcast_start_thread(struct net_device *dev) 657{ 658 struct ipoib_dev_priv *priv = ipoib_priv(dev); 659 unsigned long flags; 660 661 ipoib_dbg_mcast(priv, "starting multicast thread\n"); 662 663 spin_lock_irqsave(&priv->lock, flags); 664 __ipoib_mcast_schedule_join_thread(priv, NULL, 0); 665 spin_unlock_irqrestore(&priv->lock, flags); 666} 667 668void ipoib_mcast_stop_thread(struct net_device *dev) 669{ 670 struct ipoib_dev_priv *priv = ipoib_priv(dev); 671 672 ipoib_dbg_mcast(priv, "stopping multicast thread\n"); 673 674 cancel_delayed_work_sync(&priv->mcast_task); 675} 676 677static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast) 678{ 679 struct ipoib_dev_priv *priv = ipoib_priv(dev); 680 struct rdma_netdev *rn = netdev_priv(dev); 681 int ret = 0; 682 683 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 684 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n"); 685 686 if (!IS_ERR_OR_NULL(mcast->mc)) 687 ib_sa_free_multicast(mcast->mc); 688 689 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) { 690 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n", 691 mcast->mcmember.mgid.raw); 692 693 /* Remove ourselves from the multicast group */ 694 ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid, 695 be16_to_cpu(mcast->mcmember.mlid)); 696 if (ret) 697 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret); 698 } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) 699 ipoib_dbg(priv, "leaving with no mcmember but not a " 700 "SENDONLY join\n"); 701 702 return 0; 703} 704 705/* 706 * Check if the multicast group is sendonly. If so remove it from the maps 707 * and add to the remove list 708 */ 709void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid, 710 struct list_head *remove_list) 711{ 712 /* Is this multicast ? */ 713 if (*mgid == 0xff) { 714 struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid); 715 716 if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 717 list_del(&mcast->list); 718 rb_erase(&mcast->rb_node, &priv->multicast_tree); 719 list_add_tail(&mcast->list, remove_list); 720 } 721 } 722} 723 724void ipoib_mcast_remove_list(struct list_head *remove_list) 725{ 726 struct ipoib_mcast *mcast, *tmcast; 727 728 /* 729 * make sure the in-flight joins have finished before we attempt 730 * to leave 731 */ 732 list_for_each_entry_safe(mcast, tmcast, remove_list, list) 733 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) 734 wait_for_completion(&mcast->done); 735 736 list_for_each_entry_safe(mcast, tmcast, remove_list, list) { 737 ipoib_mcast_leave(mcast->dev, mcast); 738 ipoib_mcast_free(mcast); 739 } 740} 741 742void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb) 743{ 744 struct ipoib_dev_priv *priv = ipoib_priv(dev); 745 struct rdma_netdev *rn = netdev_priv(dev); 746 struct ipoib_mcast *mcast; 747 unsigned long flags; 748 void *mgid = daddr + 4; 749 750 spin_lock_irqsave(&priv->lock, flags); 751 752 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) || 753 !priv->broadcast || 754 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) { 755 ++dev->stats.tx_dropped; 756 dev_kfree_skb_any(skb); 757 goto unlock; 758 } 759 760 mcast = __ipoib_mcast_find(dev, mgid); 761 if (!mcast || !mcast->ah) { 762 if (!mcast) { 763 /* Let's create a new send only group now */ 764 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n", 765 mgid); 766 767 mcast = ipoib_mcast_alloc(dev); 768 if (!mcast) { 769 ipoib_warn(priv, "unable to allocate memory " 770 "for multicast structure\n"); 771 ++dev->stats.tx_dropped; 772 dev_kfree_skb_any(skb); 773 goto unlock; 774 } 775 776 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags); 777 memcpy(mcast->mcmember.mgid.raw, mgid, 778 sizeof (union ib_gid)); 779 __ipoib_mcast_add(dev, mcast); 780 list_add_tail(&mcast->list, &priv->multicast_list); 781 } 782 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) { 783 /* put pseudoheader back on for next time */ 784 skb_push(skb, sizeof(struct ipoib_pseudo_header)); 785 skb_queue_tail(&mcast->pkt_queue, skb); 786 } else { 787 ++dev->stats.tx_dropped; 788 dev_kfree_skb_any(skb); 789 } 790 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) { 791 __ipoib_mcast_schedule_join_thread(priv, NULL, 0); 792 } 793 } else { 794 struct ipoib_neigh *neigh; 795 796 spin_unlock_irqrestore(&priv->lock, flags); 797 neigh = ipoib_neigh_get(dev, daddr); 798 spin_lock_irqsave(&priv->lock, flags); 799 if (!neigh) { 800 neigh = ipoib_neigh_alloc(daddr, dev); 801 /* Make sure that the neigh will be added only 802 * once to mcast list. 803 */ 804 if (neigh && list_empty(&neigh->list)) { 805 kref_get(&mcast->ah->ref); 806 neigh->ah = mcast->ah; 807 neigh->ah->valid = 1; 808 list_add_tail(&neigh->list, &mcast->neigh_list); 809 } 810 } 811 spin_unlock_irqrestore(&priv->lock, flags); 812 mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah, 813 IB_MULTICAST_QPN); 814 if (neigh) 815 ipoib_neigh_put(neigh); 816 return; 817 } 818 819unlock: 820 spin_unlock_irqrestore(&priv->lock, flags); 821} 822 823void ipoib_mcast_dev_flush(struct net_device *dev) 824{ 825 struct ipoib_dev_priv *priv = ipoib_priv(dev); 826 LIST_HEAD(remove_list); 827 struct ipoib_mcast *mcast, *tmcast; 828 unsigned long flags; 829 830 mutex_lock(&priv->mcast_mutex); 831 ipoib_dbg_mcast(priv, "flushing multicast list\n"); 832 833 spin_lock_irqsave(&priv->lock, flags); 834 835 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 836 list_del(&mcast->list); 837 rb_erase(&mcast->rb_node, &priv->multicast_tree); 838 list_add_tail(&mcast->list, &remove_list); 839 } 840 841 if (priv->broadcast) { 842 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree); 843 list_add_tail(&priv->broadcast->list, &remove_list); 844 priv->broadcast = NULL; 845 } 846 847 spin_unlock_irqrestore(&priv->lock, flags); 848 849 ipoib_mcast_remove_list(&remove_list); 850 mutex_unlock(&priv->mcast_mutex); 851} 852 853static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast) 854{ 855 /* reserved QPN, prefix, scope */ 856 if (memcmp(addr, broadcast, 6)) 857 return 0; 858 /* signature lower, pkey */ 859 if (memcmp(addr + 7, broadcast + 7, 3)) 860 return 0; 861 return 1; 862} 863 864void ipoib_mcast_restart_task(struct work_struct *work) 865{ 866 struct ipoib_dev_priv *priv = 867 container_of(work, struct ipoib_dev_priv, restart_task); 868 struct net_device *dev = priv->dev; 869 struct netdev_hw_addr *ha; 870 struct ipoib_mcast *mcast, *tmcast; 871 LIST_HEAD(remove_list); 872 struct ib_sa_mcmember_rec rec; 873 874 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) 875 /* 876 * shortcut...on shutdown flush is called next, just 877 * let it do all the work 878 */ 879 return; 880 881 ipoib_dbg_mcast(priv, "restarting multicast task\n"); 882 883 netif_addr_lock_bh(dev); 884 spin_lock_irq(&priv->lock); 885 886 /* 887 * Unfortunately, the networking core only gives us a list of all of 888 * the multicast hardware addresses. We need to figure out which ones 889 * are new and which ones have been removed 890 */ 891 892 /* Clear out the found flag */ 893 list_for_each_entry(mcast, &priv->multicast_list, list) 894 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 895 896 /* Mark all of the entries that are found or don't exist */ 897 netdev_for_each_mc_addr(ha, dev) { 898 union ib_gid mgid; 899 900 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast)) 901 continue; 902 903 memcpy(mgid.raw, ha->addr + 4, sizeof(mgid)); 904 905 mcast = __ipoib_mcast_find(dev, &mgid); 906 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 907 struct ipoib_mcast *nmcast; 908 909 /* ignore group which is directly joined by userspace */ 910 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) && 911 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) { 912 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n", 913 mgid.raw); 914 continue; 915 } 916 917 /* Not found or send-only group, let's add a new entry */ 918 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n", 919 mgid.raw); 920 921 nmcast = ipoib_mcast_alloc(dev); 922 if (!nmcast) { 923 ipoib_warn(priv, "unable to allocate memory for multicast structure\n"); 924 continue; 925 } 926 927 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags); 928 929 nmcast->mcmember.mgid = mgid; 930 931 if (mcast) { 932 /* Destroy the send only entry */ 933 list_move_tail(&mcast->list, &remove_list); 934 935 rb_replace_node(&mcast->rb_node, 936 &nmcast->rb_node, 937 &priv->multicast_tree); 938 } else 939 __ipoib_mcast_add(dev, nmcast); 940 941 list_add_tail(&nmcast->list, &priv->multicast_list); 942 } 943 944 if (mcast) 945 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags); 946 } 947 948 /* Remove all of the entries don't exist anymore */ 949 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) { 950 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) && 951 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) { 952 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n", 953 mcast->mcmember.mgid.raw); 954 955 rb_erase(&mcast->rb_node, &priv->multicast_tree); 956 957 /* Move to the remove list */ 958 list_move_tail(&mcast->list, &remove_list); 959 } 960 } 961 962 spin_unlock_irq(&priv->lock); 963 netif_addr_unlock_bh(dev); 964 965 ipoib_mcast_remove_list(&remove_list); 966 967 /* 968 * Double check that we are still up 969 */ 970 if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 971 spin_lock_irq(&priv->lock); 972 __ipoib_mcast_schedule_join_thread(priv, NULL, 0); 973 spin_unlock_irq(&priv->lock); 974 } 975} 976 977#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 978 979struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev) 980{ 981 struct ipoib_mcast_iter *iter; 982 983 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 984 if (!iter) 985 return NULL; 986 987 iter->dev = dev; 988 memset(iter->mgid.raw, 0, 16); 989 990 if (ipoib_mcast_iter_next(iter)) { 991 kfree(iter); 992 return NULL; 993 } 994 995 return iter; 996} 997 998int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter) 999{ 1000 struct ipoib_dev_priv *priv = ipoib_priv(iter->dev); 1001 struct rb_node *n; 1002 struct ipoib_mcast *mcast; 1003 int ret = 1; 1004 1005 spin_lock_irq(&priv->lock); 1006 1007 n = rb_first(&priv->multicast_tree); 1008 1009 while (n) { 1010 mcast = rb_entry(n, struct ipoib_mcast, rb_node); 1011 1012 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw, 1013 sizeof (union ib_gid)) < 0) { 1014 iter->mgid = mcast->mcmember.mgid; 1015 iter->created = mcast->created; 1016 iter->queuelen = skb_queue_len(&mcast->pkt_queue); 1017 iter->complete = !!mcast->ah; 1018 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY)); 1019 1020 ret = 0; 1021 1022 break; 1023 } 1024 1025 n = rb_next(n); 1026 } 1027 1028 spin_unlock_irq(&priv->lock); 1029 1030 return ret; 1031} 1032 1033void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter, 1034 union ib_gid *mgid, 1035 unsigned long *created, 1036 unsigned int *queuelen, 1037 unsigned int *complete, 1038 unsigned int *send_only) 1039{ 1040 *mgid = iter->mgid; 1041 *created = iter->created; 1042 *queuelen = iter->queuelen; 1043 *complete = iter->complete; 1044 *send_only = iter->send_only; 1045} 1046 1047#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 1048