1 /* 2 * Copyright (c) 2004 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 "ipoib.h" 36 37 #include <linux/module.h> 38 39 #include <linux/init.h> 40 #include <linux/slab.h> 41 #include <linux/kernel.h> 42 #include <linux/vmalloc.h> 43 44 #include <linux/if_arp.h> /* For ARPHRD_xxx */ 45 46 #include <linux/ip.h> 47 #include <linux/in.h> 48 49 #include <linux/jhash.h> 50 #include <net/arp.h> 51 #include <net/addrconf.h> 52 #include <linux/inetdevice.h> 53 #include <rdma/ib_cache.h> 54 55 MODULE_AUTHOR("Roland Dreier"); 56 MODULE_DESCRIPTION("IP-over-InfiniBand net driver"); 57 MODULE_LICENSE("Dual BSD/GPL"); 58 59 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE; 60 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE; 61 62 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444); 63 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue"); 64 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444); 65 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue"); 66 67 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 68 int ipoib_debug_level; 69 70 module_param_named(debug_level, ipoib_debug_level, int, 0644); 71 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0"); 72 #endif 73 74 struct ipoib_path_iter { 75 struct net_device *dev; 76 struct ipoib_path path; 77 }; 78 79 static const u8 ipv4_bcast_addr[] = { 80 0x00, 0xff, 0xff, 0xff, 81 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, 82 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff 83 }; 84 85 struct workqueue_struct *ipoib_workqueue; 86 87 struct ib_sa_client ipoib_sa_client; 88 89 static int ipoib_add_one(struct ib_device *device); 90 static void ipoib_remove_one(struct ib_device *device, void *client_data); 91 static void ipoib_neigh_reclaim(struct rcu_head *rp); 92 static struct net_device *ipoib_get_net_dev_by_params( 93 struct ib_device *dev, u8 port, u16 pkey, 94 const union ib_gid *gid, const struct sockaddr *addr, 95 void *client_data); 96 static int ipoib_set_mac(struct net_device *dev, void *addr); 97 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr, 98 int cmd); 99 100 static struct ib_client ipoib_client = { 101 .name = "ipoib", 102 .add = ipoib_add_one, 103 .remove = ipoib_remove_one, 104 .get_net_dev_by_params = ipoib_get_net_dev_by_params, 105 }; 106 107 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 108 static int ipoib_netdev_event(struct notifier_block *this, 109 unsigned long event, void *ptr) 110 { 111 struct netdev_notifier_info *ni = ptr; 112 struct net_device *dev = ni->dev; 113 114 if (dev->netdev_ops->ndo_open != ipoib_open) 115 return NOTIFY_DONE; 116 117 switch (event) { 118 case NETDEV_REGISTER: 119 ipoib_create_debug_files(dev); 120 break; 121 case NETDEV_CHANGENAME: 122 ipoib_delete_debug_files(dev); 123 ipoib_create_debug_files(dev); 124 break; 125 case NETDEV_UNREGISTER: 126 ipoib_delete_debug_files(dev); 127 break; 128 } 129 130 return NOTIFY_DONE; 131 } 132 #endif 133 134 int ipoib_open(struct net_device *dev) 135 { 136 struct ipoib_dev_priv *priv = ipoib_priv(dev); 137 138 ipoib_dbg(priv, "bringing up interface\n"); 139 140 netif_carrier_off(dev); 141 142 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 143 144 priv->sm_fullmember_sendonly_support = false; 145 146 if (ipoib_ib_dev_open(dev)) { 147 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 148 return 0; 149 goto err_disable; 150 } 151 152 ipoib_ib_dev_up(dev); 153 154 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 155 struct ipoib_dev_priv *cpriv; 156 157 /* Bring up any child interfaces too */ 158 down_read(&priv->vlan_rwsem); 159 list_for_each_entry(cpriv, &priv->child_intfs, list) { 160 int flags; 161 162 flags = cpriv->dev->flags; 163 if (flags & IFF_UP) 164 continue; 165 166 dev_change_flags(cpriv->dev, flags | IFF_UP, NULL); 167 } 168 up_read(&priv->vlan_rwsem); 169 } 170 171 netif_start_queue(dev); 172 173 return 0; 174 175 err_disable: 176 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 177 178 return -EINVAL; 179 } 180 181 static int ipoib_stop(struct net_device *dev) 182 { 183 struct ipoib_dev_priv *priv = ipoib_priv(dev); 184 185 ipoib_dbg(priv, "stopping interface\n"); 186 187 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 188 189 netif_stop_queue(dev); 190 191 ipoib_ib_dev_down(dev); 192 ipoib_ib_dev_stop(dev); 193 194 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 195 struct ipoib_dev_priv *cpriv; 196 197 /* Bring down any child interfaces too */ 198 down_read(&priv->vlan_rwsem); 199 list_for_each_entry(cpriv, &priv->child_intfs, list) { 200 int flags; 201 202 flags = cpriv->dev->flags; 203 if (!(flags & IFF_UP)) 204 continue; 205 206 dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL); 207 } 208 up_read(&priv->vlan_rwsem); 209 } 210 211 return 0; 212 } 213 214 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features) 215 { 216 struct ipoib_dev_priv *priv = ipoib_priv(dev); 217 218 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 219 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO); 220 221 return features; 222 } 223 224 static int ipoib_change_mtu(struct net_device *dev, int new_mtu) 225 { 226 struct ipoib_dev_priv *priv = ipoib_priv(dev); 227 int ret = 0; 228 229 /* dev->mtu > 2K ==> connected mode */ 230 if (ipoib_cm_admin_enabled(dev)) { 231 if (new_mtu > ipoib_cm_max_mtu(dev)) 232 return -EINVAL; 233 234 if (new_mtu > priv->mcast_mtu) 235 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n", 236 priv->mcast_mtu); 237 238 dev->mtu = new_mtu; 239 return 0; 240 } 241 242 if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) || 243 new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) 244 return -EINVAL; 245 246 priv->admin_mtu = new_mtu; 247 248 if (priv->mcast_mtu < priv->admin_mtu) 249 ipoib_dbg(priv, "MTU must be smaller than the underlying " 250 "link layer MTU - 4 (%u)\n", priv->mcast_mtu); 251 252 new_mtu = min(priv->mcast_mtu, priv->admin_mtu); 253 254 if (priv->rn_ops->ndo_change_mtu) { 255 bool carrier_status = netif_carrier_ok(dev); 256 257 netif_carrier_off(dev); 258 259 /* notify lower level on the real mtu */ 260 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu); 261 262 if (carrier_status) 263 netif_carrier_on(dev); 264 } else { 265 dev->mtu = new_mtu; 266 } 267 268 return ret; 269 } 270 271 static void ipoib_get_stats(struct net_device *dev, 272 struct rtnl_link_stats64 *stats) 273 { 274 struct ipoib_dev_priv *priv = ipoib_priv(dev); 275 276 if (priv->rn_ops->ndo_get_stats64) 277 priv->rn_ops->ndo_get_stats64(dev, stats); 278 else 279 netdev_stats_to_stats64(stats, &dev->stats); 280 } 281 282 /* Called with an RCU read lock taken */ 283 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr, 284 struct net_device *dev) 285 { 286 struct net *net = dev_net(dev); 287 struct in_device *in_dev; 288 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr; 289 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr; 290 __be32 ret_addr; 291 292 switch (addr->sa_family) { 293 case AF_INET: 294 in_dev = in_dev_get(dev); 295 if (!in_dev) 296 return false; 297 298 ret_addr = inet_confirm_addr(net, in_dev, 0, 299 addr_in->sin_addr.s_addr, 300 RT_SCOPE_HOST); 301 in_dev_put(in_dev); 302 if (ret_addr) 303 return true; 304 305 break; 306 case AF_INET6: 307 if (IS_ENABLED(CONFIG_IPV6) && 308 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1)) 309 return true; 310 311 break; 312 } 313 return false; 314 } 315 316 /** 317 * Find the master net_device on top of the given net_device. 318 * @dev: base IPoIB net_device 319 * 320 * Returns the master net_device with a reference held, or the same net_device 321 * if no master exists. 322 */ 323 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev) 324 { 325 struct net_device *master; 326 327 rcu_read_lock(); 328 master = netdev_master_upper_dev_get_rcu(dev); 329 if (master) 330 dev_hold(master); 331 rcu_read_unlock(); 332 333 if (master) 334 return master; 335 336 dev_hold(dev); 337 return dev; 338 } 339 340 struct ipoib_walk_data { 341 const struct sockaddr *addr; 342 struct net_device *result; 343 }; 344 345 static int ipoib_upper_walk(struct net_device *upper, void *_data) 346 { 347 struct ipoib_walk_data *data = _data; 348 int ret = 0; 349 350 if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) { 351 dev_hold(upper); 352 data->result = upper; 353 ret = 1; 354 } 355 356 return ret; 357 } 358 359 /** 360 * Find a net_device matching the given address, which is an upper device of 361 * the given net_device. 362 * @addr: IP address to look for. 363 * @dev: base IPoIB net_device 364 * 365 * If found, returns the net_device with a reference held. Otherwise return 366 * NULL. 367 */ 368 static struct net_device *ipoib_get_net_dev_match_addr( 369 const struct sockaddr *addr, struct net_device *dev) 370 { 371 struct ipoib_walk_data data = { 372 .addr = addr, 373 }; 374 375 rcu_read_lock(); 376 if (ipoib_is_dev_match_addr_rcu(addr, dev)) { 377 dev_hold(dev); 378 data.result = dev; 379 goto out; 380 } 381 382 netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data); 383 out: 384 rcu_read_unlock(); 385 return data.result; 386 } 387 388 /* returns the number of IPoIB netdevs on top a given ipoib device matching a 389 * pkey_index and address, if one exists. 390 * 391 * @found_net_dev: contains a matching net_device if the return value >= 1, 392 * with a reference held. */ 393 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv, 394 const union ib_gid *gid, 395 u16 pkey_index, 396 const struct sockaddr *addr, 397 int nesting, 398 struct net_device **found_net_dev) 399 { 400 struct ipoib_dev_priv *child_priv; 401 struct net_device *net_dev = NULL; 402 int matches = 0; 403 404 if (priv->pkey_index == pkey_index && 405 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) { 406 if (!addr) { 407 net_dev = ipoib_get_master_net_dev(priv->dev); 408 } else { 409 /* Verify the net_device matches the IP address, as 410 * IPoIB child devices currently share a GID. */ 411 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev); 412 } 413 if (net_dev) { 414 if (!*found_net_dev) 415 *found_net_dev = net_dev; 416 else 417 dev_put(net_dev); 418 ++matches; 419 } 420 } 421 422 /* Check child interfaces */ 423 down_read_nested(&priv->vlan_rwsem, nesting); 424 list_for_each_entry(child_priv, &priv->child_intfs, list) { 425 matches += ipoib_match_gid_pkey_addr(child_priv, gid, 426 pkey_index, addr, 427 nesting + 1, 428 found_net_dev); 429 if (matches > 1) 430 break; 431 } 432 up_read(&priv->vlan_rwsem); 433 434 return matches; 435 } 436 437 /* Returns the number of matching net_devs found (between 0 and 2). Also 438 * return the matching net_device in the @net_dev parameter, holding a 439 * reference to the net_device, if the number of matches >= 1 */ 440 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port, 441 u16 pkey_index, 442 const union ib_gid *gid, 443 const struct sockaddr *addr, 444 struct net_device **net_dev) 445 { 446 struct ipoib_dev_priv *priv; 447 int matches = 0; 448 449 *net_dev = NULL; 450 451 list_for_each_entry(priv, dev_list, list) { 452 if (priv->port != port) 453 continue; 454 455 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index, 456 addr, 0, net_dev); 457 if (matches > 1) 458 break; 459 } 460 461 return matches; 462 } 463 464 static struct net_device *ipoib_get_net_dev_by_params( 465 struct ib_device *dev, u8 port, u16 pkey, 466 const union ib_gid *gid, const struct sockaddr *addr, 467 void *client_data) 468 { 469 struct net_device *net_dev; 470 struct list_head *dev_list = client_data; 471 u16 pkey_index; 472 int matches; 473 int ret; 474 475 if (!rdma_protocol_ib(dev, port)) 476 return NULL; 477 478 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index); 479 if (ret) 480 return NULL; 481 482 /* See if we can find a unique device matching the L2 parameters */ 483 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, 484 gid, NULL, &net_dev); 485 486 switch (matches) { 487 case 0: 488 return NULL; 489 case 1: 490 return net_dev; 491 } 492 493 dev_put(net_dev); 494 495 /* Couldn't find a unique device with L2 parameters only. Use L3 496 * address to uniquely match the net device */ 497 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, 498 gid, addr, &net_dev); 499 switch (matches) { 500 case 0: 501 return NULL; 502 default: 503 dev_warn_ratelimited(&dev->dev, 504 "duplicate IP address detected\n"); 505 fallthrough; 506 case 1: 507 return net_dev; 508 } 509 } 510 511 int ipoib_set_mode(struct net_device *dev, const char *buf) 512 { 513 struct ipoib_dev_priv *priv = ipoib_priv(dev); 514 515 if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) && 516 !strcmp(buf, "connected\n")) || 517 (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) && 518 !strcmp(buf, "datagram\n"))) { 519 return 0; 520 } 521 522 /* flush paths if we switch modes so that connections are restarted */ 523 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 524 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 525 ipoib_warn(priv, "enabling connected mode " 526 "will cause multicast packet drops\n"); 527 netdev_update_features(dev); 528 dev_set_mtu(dev, ipoib_cm_max_mtu(dev)); 529 netif_set_real_num_tx_queues(dev, 1); 530 rtnl_unlock(); 531 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM; 532 533 ipoib_flush_paths(dev); 534 return (!rtnl_trylock()) ? -EBUSY : 0; 535 } 536 537 if (!strcmp(buf, "datagram\n")) { 538 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 539 netdev_update_features(dev); 540 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu)); 541 netif_set_real_num_tx_queues(dev, dev->num_tx_queues); 542 rtnl_unlock(); 543 ipoib_flush_paths(dev); 544 return (!rtnl_trylock()) ? -EBUSY : 0; 545 } 546 547 return -EINVAL; 548 } 549 550 struct ipoib_path *__path_find(struct net_device *dev, void *gid) 551 { 552 struct ipoib_dev_priv *priv = ipoib_priv(dev); 553 struct rb_node *n = priv->path_tree.rb_node; 554 struct ipoib_path *path; 555 int ret; 556 557 while (n) { 558 path = rb_entry(n, struct ipoib_path, rb_node); 559 560 ret = memcmp(gid, path->pathrec.dgid.raw, 561 sizeof (union ib_gid)); 562 563 if (ret < 0) 564 n = n->rb_left; 565 else if (ret > 0) 566 n = n->rb_right; 567 else 568 return path; 569 } 570 571 return NULL; 572 } 573 574 static int __path_add(struct net_device *dev, struct ipoib_path *path) 575 { 576 struct ipoib_dev_priv *priv = ipoib_priv(dev); 577 struct rb_node **n = &priv->path_tree.rb_node; 578 struct rb_node *pn = NULL; 579 struct ipoib_path *tpath; 580 int ret; 581 582 while (*n) { 583 pn = *n; 584 tpath = rb_entry(pn, struct ipoib_path, rb_node); 585 586 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw, 587 sizeof (union ib_gid)); 588 if (ret < 0) 589 n = &pn->rb_left; 590 else if (ret > 0) 591 n = &pn->rb_right; 592 else 593 return -EEXIST; 594 } 595 596 rb_link_node(&path->rb_node, pn, n); 597 rb_insert_color(&path->rb_node, &priv->path_tree); 598 599 list_add_tail(&path->list, &priv->path_list); 600 601 return 0; 602 } 603 604 static void path_free(struct net_device *dev, struct ipoib_path *path) 605 { 606 struct sk_buff *skb; 607 608 while ((skb = __skb_dequeue(&path->queue))) 609 dev_kfree_skb_irq(skb); 610 611 ipoib_dbg(ipoib_priv(dev), "%s\n", __func__); 612 613 /* remove all neigh connected to this path */ 614 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 615 616 if (path->ah) 617 ipoib_put_ah(path->ah); 618 619 kfree(path); 620 } 621 622 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 623 624 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev) 625 { 626 struct ipoib_path_iter *iter; 627 628 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 629 if (!iter) 630 return NULL; 631 632 iter->dev = dev; 633 memset(iter->path.pathrec.dgid.raw, 0, 16); 634 635 if (ipoib_path_iter_next(iter)) { 636 kfree(iter); 637 return NULL; 638 } 639 640 return iter; 641 } 642 643 int ipoib_path_iter_next(struct ipoib_path_iter *iter) 644 { 645 struct ipoib_dev_priv *priv = ipoib_priv(iter->dev); 646 struct rb_node *n; 647 struct ipoib_path *path; 648 int ret = 1; 649 650 spin_lock_irq(&priv->lock); 651 652 n = rb_first(&priv->path_tree); 653 654 while (n) { 655 path = rb_entry(n, struct ipoib_path, rb_node); 656 657 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw, 658 sizeof (union ib_gid)) < 0) { 659 iter->path = *path; 660 ret = 0; 661 break; 662 } 663 664 n = rb_next(n); 665 } 666 667 spin_unlock_irq(&priv->lock); 668 669 return ret; 670 } 671 672 void ipoib_path_iter_read(struct ipoib_path_iter *iter, 673 struct ipoib_path *path) 674 { 675 *path = iter->path; 676 } 677 678 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 679 680 void ipoib_mark_paths_invalid(struct net_device *dev) 681 { 682 struct ipoib_dev_priv *priv = ipoib_priv(dev); 683 struct ipoib_path *path, *tp; 684 685 spin_lock_irq(&priv->lock); 686 687 list_for_each_entry_safe(path, tp, &priv->path_list, list) { 688 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n", 689 be32_to_cpu(sa_path_get_dlid(&path->pathrec)), 690 path->pathrec.dgid.raw); 691 if (path->ah) 692 path->ah->valid = 0; 693 } 694 695 spin_unlock_irq(&priv->lock); 696 } 697 698 static void push_pseudo_header(struct sk_buff *skb, const char *daddr) 699 { 700 struct ipoib_pseudo_header *phdr; 701 702 phdr = skb_push(skb, sizeof(*phdr)); 703 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN); 704 } 705 706 void ipoib_flush_paths(struct net_device *dev) 707 { 708 struct ipoib_dev_priv *priv = ipoib_priv(dev); 709 struct ipoib_path *path, *tp; 710 LIST_HEAD(remove_list); 711 unsigned long flags; 712 713 netif_tx_lock_bh(dev); 714 spin_lock_irqsave(&priv->lock, flags); 715 716 list_splice_init(&priv->path_list, &remove_list); 717 718 list_for_each_entry(path, &remove_list, list) 719 rb_erase(&path->rb_node, &priv->path_tree); 720 721 list_for_each_entry_safe(path, tp, &remove_list, list) { 722 if (path->query) 723 ib_sa_cancel_query(path->query_id, path->query); 724 spin_unlock_irqrestore(&priv->lock, flags); 725 netif_tx_unlock_bh(dev); 726 wait_for_completion(&path->done); 727 path_free(dev, path); 728 netif_tx_lock_bh(dev); 729 spin_lock_irqsave(&priv->lock, flags); 730 } 731 732 spin_unlock_irqrestore(&priv->lock, flags); 733 netif_tx_unlock_bh(dev); 734 } 735 736 static void path_rec_completion(int status, 737 struct sa_path_rec *pathrec, 738 void *path_ptr) 739 { 740 struct ipoib_path *path = path_ptr; 741 struct net_device *dev = path->dev; 742 struct ipoib_dev_priv *priv = ipoib_priv(dev); 743 struct ipoib_ah *ah = NULL; 744 struct ipoib_ah *old_ah = NULL; 745 struct ipoib_neigh *neigh, *tn; 746 struct sk_buff_head skqueue; 747 struct sk_buff *skb; 748 unsigned long flags; 749 750 if (!status) 751 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n", 752 be32_to_cpu(sa_path_get_dlid(pathrec)), 753 pathrec->dgid.raw); 754 else 755 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n", 756 status, path->pathrec.dgid.raw); 757 758 skb_queue_head_init(&skqueue); 759 760 if (!status) { 761 struct rdma_ah_attr av; 762 763 if (!ib_init_ah_attr_from_path(priv->ca, priv->port, 764 pathrec, &av, NULL)) { 765 ah = ipoib_create_ah(dev, priv->pd, &av); 766 rdma_destroy_ah_attr(&av); 767 } 768 } 769 770 spin_lock_irqsave(&priv->lock, flags); 771 772 if (!IS_ERR_OR_NULL(ah)) { 773 /* 774 * pathrec.dgid is used as the database key from the LLADDR, 775 * it must remain unchanged even if the SA returns a different 776 * GID to use in the AH. 777 */ 778 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw, 779 sizeof(union ib_gid))) { 780 ipoib_dbg( 781 priv, 782 "%s got PathRec for gid %pI6 while asked for %pI6\n", 783 dev->name, pathrec->dgid.raw, 784 path->pathrec.dgid.raw); 785 memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw, 786 sizeof(union ib_gid)); 787 } 788 789 path->pathrec = *pathrec; 790 791 old_ah = path->ah; 792 path->ah = ah; 793 794 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n", 795 ah, be32_to_cpu(sa_path_get_dlid(pathrec)), 796 pathrec->sl); 797 798 while ((skb = __skb_dequeue(&path->queue))) 799 __skb_queue_tail(&skqueue, skb); 800 801 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { 802 if (neigh->ah) { 803 WARN_ON(neigh->ah != old_ah); 804 /* 805 * Dropping the ah reference inside 806 * priv->lock is safe here, because we 807 * will hold one more reference from 808 * the original value of path->ah (ie 809 * old_ah). 810 */ 811 ipoib_put_ah(neigh->ah); 812 } 813 kref_get(&path->ah->ref); 814 neigh->ah = path->ah; 815 816 if (ipoib_cm_enabled(dev, neigh->daddr)) { 817 if (!ipoib_cm_get(neigh)) 818 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, 819 path, 820 neigh)); 821 if (!ipoib_cm_get(neigh)) { 822 ipoib_neigh_free(neigh); 823 continue; 824 } 825 } 826 827 while ((skb = __skb_dequeue(&neigh->queue))) 828 __skb_queue_tail(&skqueue, skb); 829 } 830 path->ah->valid = 1; 831 } 832 833 path->query = NULL; 834 complete(&path->done); 835 836 spin_unlock_irqrestore(&priv->lock, flags); 837 838 if (IS_ERR_OR_NULL(ah)) 839 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 840 841 if (old_ah) 842 ipoib_put_ah(old_ah); 843 844 while ((skb = __skb_dequeue(&skqueue))) { 845 int ret; 846 skb->dev = dev; 847 ret = dev_queue_xmit(skb); 848 if (ret) 849 ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n", 850 __func__, ret); 851 } 852 } 853 854 static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path, 855 void *gid) 856 { 857 path->dev = priv->dev; 858 859 if (rdma_cap_opa_ah(priv->ca, priv->port)) 860 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA; 861 else 862 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB; 863 864 memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid)); 865 path->pathrec.sgid = priv->local_gid; 866 path->pathrec.pkey = cpu_to_be16(priv->pkey); 867 path->pathrec.numb_path = 1; 868 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class; 869 } 870 871 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid) 872 { 873 struct ipoib_dev_priv *priv = ipoib_priv(dev); 874 struct ipoib_path *path; 875 876 if (!priv->broadcast) 877 return NULL; 878 879 path = kzalloc(sizeof(*path), GFP_ATOMIC); 880 if (!path) 881 return NULL; 882 883 skb_queue_head_init(&path->queue); 884 885 INIT_LIST_HEAD(&path->neigh_list); 886 887 init_path_rec(priv, path, gid); 888 889 return path; 890 } 891 892 static int path_rec_start(struct net_device *dev, 893 struct ipoib_path *path) 894 { 895 struct ipoib_dev_priv *priv = ipoib_priv(dev); 896 897 ipoib_dbg(priv, "Start path record lookup for %pI6\n", 898 path->pathrec.dgid.raw); 899 900 init_completion(&path->done); 901 902 path->query_id = 903 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port, 904 &path->pathrec, 905 IB_SA_PATH_REC_DGID | 906 IB_SA_PATH_REC_SGID | 907 IB_SA_PATH_REC_NUMB_PATH | 908 IB_SA_PATH_REC_TRAFFIC_CLASS | 909 IB_SA_PATH_REC_PKEY, 910 1000, GFP_ATOMIC, 911 path_rec_completion, 912 path, &path->query); 913 if (path->query_id < 0) { 914 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id); 915 path->query = NULL; 916 complete(&path->done); 917 return path->query_id; 918 } 919 920 return 0; 921 } 922 923 static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr, 924 struct net_device *dev) 925 { 926 struct ipoib_dev_priv *priv = ipoib_priv(dev); 927 struct ipoib_path *path; 928 unsigned long flags; 929 930 spin_lock_irqsave(&priv->lock, flags); 931 932 path = __path_find(dev, daddr + 4); 933 if (!path) 934 goto out; 935 if (!path->query) 936 path_rec_start(dev, path); 937 out: 938 spin_unlock_irqrestore(&priv->lock, flags); 939 } 940 941 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr, 942 struct net_device *dev) 943 { 944 struct ipoib_dev_priv *priv = ipoib_priv(dev); 945 struct rdma_netdev *rn = netdev_priv(dev); 946 struct ipoib_path *path; 947 struct ipoib_neigh *neigh; 948 unsigned long flags; 949 950 spin_lock_irqsave(&priv->lock, flags); 951 neigh = ipoib_neigh_alloc(daddr, dev); 952 if (!neigh) { 953 spin_unlock_irqrestore(&priv->lock, flags); 954 ++dev->stats.tx_dropped; 955 dev_kfree_skb_any(skb); 956 return NULL; 957 } 958 959 /* To avoid race condition, make sure that the 960 * neigh will be added only once. 961 */ 962 if (unlikely(!list_empty(&neigh->list))) { 963 spin_unlock_irqrestore(&priv->lock, flags); 964 return neigh; 965 } 966 967 path = __path_find(dev, daddr + 4); 968 if (!path) { 969 path = path_rec_create(dev, daddr + 4); 970 if (!path) 971 goto err_path; 972 973 __path_add(dev, path); 974 } 975 976 list_add_tail(&neigh->list, &path->neigh_list); 977 978 if (path->ah && path->ah->valid) { 979 kref_get(&path->ah->ref); 980 neigh->ah = path->ah; 981 982 if (ipoib_cm_enabled(dev, neigh->daddr)) { 983 if (!ipoib_cm_get(neigh)) 984 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh)); 985 if (!ipoib_cm_get(neigh)) { 986 ipoib_neigh_free(neigh); 987 goto err_drop; 988 } 989 if (skb_queue_len(&neigh->queue) < 990 IPOIB_MAX_PATH_REC_QUEUE) { 991 push_pseudo_header(skb, neigh->daddr); 992 __skb_queue_tail(&neigh->queue, skb); 993 } else { 994 ipoib_warn(priv, "queue length limit %d. Packet drop.\n", 995 skb_queue_len(&neigh->queue)); 996 goto err_drop; 997 } 998 } else { 999 spin_unlock_irqrestore(&priv->lock, flags); 1000 path->ah->last_send = rn->send(dev, skb, path->ah->ah, 1001 IPOIB_QPN(daddr)); 1002 ipoib_neigh_put(neigh); 1003 return NULL; 1004 } 1005 } else { 1006 neigh->ah = NULL; 1007 1008 if (!path->query && path_rec_start(dev, path)) 1009 goto err_path; 1010 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1011 push_pseudo_header(skb, neigh->daddr); 1012 __skb_queue_tail(&neigh->queue, skb); 1013 } else { 1014 goto err_drop; 1015 } 1016 } 1017 1018 spin_unlock_irqrestore(&priv->lock, flags); 1019 ipoib_neigh_put(neigh); 1020 return NULL; 1021 1022 err_path: 1023 ipoib_neigh_free(neigh); 1024 err_drop: 1025 ++dev->stats.tx_dropped; 1026 dev_kfree_skb_any(skb); 1027 1028 spin_unlock_irqrestore(&priv->lock, flags); 1029 ipoib_neigh_put(neigh); 1030 1031 return NULL; 1032 } 1033 1034 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, 1035 struct ipoib_pseudo_header *phdr) 1036 { 1037 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1038 struct rdma_netdev *rn = netdev_priv(dev); 1039 struct ipoib_path *path; 1040 unsigned long flags; 1041 1042 spin_lock_irqsave(&priv->lock, flags); 1043 1044 /* no broadcast means that all paths are (going to be) not valid */ 1045 if (!priv->broadcast) 1046 goto drop_and_unlock; 1047 1048 path = __path_find(dev, phdr->hwaddr + 4); 1049 if (!path || !path->ah || !path->ah->valid) { 1050 if (!path) { 1051 path = path_rec_create(dev, phdr->hwaddr + 4); 1052 if (!path) 1053 goto drop_and_unlock; 1054 __path_add(dev, path); 1055 } else { 1056 /* 1057 * make sure there are no changes in the existing 1058 * path record 1059 */ 1060 init_path_rec(priv, path, phdr->hwaddr + 4); 1061 } 1062 if (!path->query && path_rec_start(dev, path)) { 1063 goto drop_and_unlock; 1064 } 1065 1066 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1067 push_pseudo_header(skb, phdr->hwaddr); 1068 __skb_queue_tail(&path->queue, skb); 1069 goto unlock; 1070 } else { 1071 goto drop_and_unlock; 1072 } 1073 } 1074 1075 spin_unlock_irqrestore(&priv->lock, flags); 1076 ipoib_dbg(priv, "Send unicast ARP to %08x\n", 1077 be32_to_cpu(sa_path_get_dlid(&path->pathrec))); 1078 path->ah->last_send = rn->send(dev, skb, path->ah->ah, 1079 IPOIB_QPN(phdr->hwaddr)); 1080 return; 1081 1082 drop_and_unlock: 1083 ++dev->stats.tx_dropped; 1084 dev_kfree_skb_any(skb); 1085 unlock: 1086 spin_unlock_irqrestore(&priv->lock, flags); 1087 } 1088 1089 static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 1090 { 1091 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1092 struct rdma_netdev *rn = netdev_priv(dev); 1093 struct ipoib_neigh *neigh; 1094 struct ipoib_pseudo_header *phdr; 1095 struct ipoib_header *header; 1096 unsigned long flags; 1097 1098 phdr = (struct ipoib_pseudo_header *) skb->data; 1099 skb_pull(skb, sizeof(*phdr)); 1100 header = (struct ipoib_header *) skb->data; 1101 1102 if (unlikely(phdr->hwaddr[4] == 0xff)) { 1103 /* multicast, arrange "if" according to probability */ 1104 if ((header->proto != htons(ETH_P_IP)) && 1105 (header->proto != htons(ETH_P_IPV6)) && 1106 (header->proto != htons(ETH_P_ARP)) && 1107 (header->proto != htons(ETH_P_RARP)) && 1108 (header->proto != htons(ETH_P_TIPC))) { 1109 /* ethertype not supported by IPoIB */ 1110 ++dev->stats.tx_dropped; 1111 dev_kfree_skb_any(skb); 1112 return NETDEV_TX_OK; 1113 } 1114 /* Add in the P_Key for multicast*/ 1115 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff; 1116 phdr->hwaddr[9] = priv->pkey & 0xff; 1117 1118 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1119 if (likely(neigh)) 1120 goto send_using_neigh; 1121 ipoib_mcast_send(dev, phdr->hwaddr, skb); 1122 return NETDEV_TX_OK; 1123 } 1124 1125 /* unicast, arrange "switch" according to probability */ 1126 switch (header->proto) { 1127 case htons(ETH_P_IP): 1128 case htons(ETH_P_IPV6): 1129 case htons(ETH_P_TIPC): 1130 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1131 if (unlikely(!neigh)) { 1132 neigh = neigh_add_path(skb, phdr->hwaddr, dev); 1133 if (likely(!neigh)) 1134 return NETDEV_TX_OK; 1135 } 1136 break; 1137 case htons(ETH_P_ARP): 1138 case htons(ETH_P_RARP): 1139 /* for unicast ARP and RARP should always perform path find */ 1140 unicast_arp_send(skb, dev, phdr); 1141 return NETDEV_TX_OK; 1142 default: 1143 /* ethertype not supported by IPoIB */ 1144 ++dev->stats.tx_dropped; 1145 dev_kfree_skb_any(skb); 1146 return NETDEV_TX_OK; 1147 } 1148 1149 send_using_neigh: 1150 /* note we now hold a ref to neigh */ 1151 if (ipoib_cm_get(neigh)) { 1152 if (ipoib_cm_up(neigh)) { 1153 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); 1154 goto unref; 1155 } 1156 } else if (neigh->ah && neigh->ah->valid) { 1157 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah, 1158 IPOIB_QPN(phdr->hwaddr)); 1159 goto unref; 1160 } else if (neigh->ah) { 1161 neigh_refresh_path(neigh, phdr->hwaddr, dev); 1162 } 1163 1164 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1165 push_pseudo_header(skb, phdr->hwaddr); 1166 spin_lock_irqsave(&priv->lock, flags); 1167 __skb_queue_tail(&neigh->queue, skb); 1168 spin_unlock_irqrestore(&priv->lock, flags); 1169 } else { 1170 ++dev->stats.tx_dropped; 1171 dev_kfree_skb_any(skb); 1172 } 1173 1174 unref: 1175 ipoib_neigh_put(neigh); 1176 1177 return NETDEV_TX_OK; 1178 } 1179 1180 static void ipoib_timeout(struct net_device *dev, unsigned int txqueue) 1181 { 1182 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1183 1184 ipoib_warn(priv, "transmit timeout: latency %d msecs\n", 1185 jiffies_to_msecs(jiffies - dev_trans_start(dev))); 1186 ipoib_warn(priv, 1187 "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n", 1188 netif_queue_stopped(dev), priv->tx_head, priv->tx_tail, 1189 priv->global_tx_head, priv->global_tx_tail); 1190 1191 /* XXX reset QP, etc. */ 1192 } 1193 1194 static int ipoib_hard_header(struct sk_buff *skb, 1195 struct net_device *dev, 1196 unsigned short type, 1197 const void *daddr, 1198 const void *saddr, 1199 unsigned int len) 1200 { 1201 struct ipoib_header *header; 1202 1203 header = skb_push(skb, sizeof(*header)); 1204 1205 header->proto = htons(type); 1206 header->reserved = 0; 1207 1208 /* 1209 * we don't rely on dst_entry structure, always stuff the 1210 * destination address into skb hard header so we can figure out where 1211 * to send the packet later. 1212 */ 1213 push_pseudo_header(skb, daddr); 1214 1215 return IPOIB_HARD_LEN; 1216 } 1217 1218 static void ipoib_set_mcast_list(struct net_device *dev) 1219 { 1220 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1221 1222 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 1223 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); 1224 return; 1225 } 1226 1227 queue_work(priv->wq, &priv->restart_task); 1228 } 1229 1230 static int ipoib_get_iflink(const struct net_device *dev) 1231 { 1232 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1233 1234 /* parent interface */ 1235 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1236 return dev->ifindex; 1237 1238 /* child/vlan interface */ 1239 return priv->parent->ifindex; 1240 } 1241 1242 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr) 1243 { 1244 /* 1245 * Use only the address parts that contributes to spreading 1246 * The subnet prefix is not used as one can not connect to 1247 * same remote port (GUID) using the same remote QPN via two 1248 * different subnets. 1249 */ 1250 /* qpn octets[1:4) & port GUID octets[12:20) */ 1251 u32 *d32 = (u32 *) daddr; 1252 u32 hv; 1253 1254 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0); 1255 return hv & htbl->mask; 1256 } 1257 1258 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr) 1259 { 1260 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1261 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1262 struct ipoib_neigh_hash *htbl; 1263 struct ipoib_neigh *neigh = NULL; 1264 u32 hash_val; 1265 1266 rcu_read_lock_bh(); 1267 1268 htbl = rcu_dereference_bh(ntbl->htbl); 1269 1270 if (!htbl) 1271 goto out_unlock; 1272 1273 hash_val = ipoib_addr_hash(htbl, daddr); 1274 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]); 1275 neigh != NULL; 1276 neigh = rcu_dereference_bh(neigh->hnext)) { 1277 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1278 /* found, take one ref on behalf of the caller */ 1279 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1280 /* deleted */ 1281 neigh = NULL; 1282 goto out_unlock; 1283 } 1284 1285 if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)) 1286 neigh->alive = jiffies; 1287 goto out_unlock; 1288 } 1289 } 1290 1291 out_unlock: 1292 rcu_read_unlock_bh(); 1293 return neigh; 1294 } 1295 1296 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv) 1297 { 1298 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1299 struct ipoib_neigh_hash *htbl; 1300 unsigned long neigh_obsolete; 1301 unsigned long dt; 1302 unsigned long flags; 1303 int i; 1304 LIST_HEAD(remove_list); 1305 1306 spin_lock_irqsave(&priv->lock, flags); 1307 1308 htbl = rcu_dereference_protected(ntbl->htbl, 1309 lockdep_is_held(&priv->lock)); 1310 1311 if (!htbl) 1312 goto out_unlock; 1313 1314 /* neigh is obsolete if it was idle for two GC periods */ 1315 dt = 2 * arp_tbl.gc_interval; 1316 neigh_obsolete = jiffies - dt; 1317 1318 for (i = 0; i < htbl->size; i++) { 1319 struct ipoib_neigh *neigh; 1320 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1321 1322 while ((neigh = rcu_dereference_protected(*np, 1323 lockdep_is_held(&priv->lock))) != NULL) { 1324 /* was the neigh idle for two GC periods */ 1325 if (time_after(neigh_obsolete, neigh->alive)) { 1326 1327 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list); 1328 1329 rcu_assign_pointer(*np, 1330 rcu_dereference_protected(neigh->hnext, 1331 lockdep_is_held(&priv->lock))); 1332 /* remove from path/mc list */ 1333 list_del_init(&neigh->list); 1334 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1335 } else { 1336 np = &neigh->hnext; 1337 } 1338 1339 } 1340 } 1341 1342 out_unlock: 1343 spin_unlock_irqrestore(&priv->lock, flags); 1344 ipoib_mcast_remove_list(&remove_list); 1345 } 1346 1347 static void ipoib_reap_neigh(struct work_struct *work) 1348 { 1349 struct ipoib_dev_priv *priv = 1350 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work); 1351 1352 __ipoib_reap_neigh(priv); 1353 1354 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1355 arp_tbl.gc_interval); 1356 } 1357 1358 1359 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr, 1360 struct net_device *dev) 1361 { 1362 struct ipoib_neigh *neigh; 1363 1364 neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC); 1365 if (!neigh) 1366 return NULL; 1367 1368 neigh->dev = dev; 1369 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr)); 1370 skb_queue_head_init(&neigh->queue); 1371 INIT_LIST_HEAD(&neigh->list); 1372 ipoib_cm_set(neigh, NULL); 1373 /* one ref on behalf of the caller */ 1374 atomic_set(&neigh->refcnt, 1); 1375 1376 return neigh; 1377 } 1378 1379 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr, 1380 struct net_device *dev) 1381 { 1382 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1383 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1384 struct ipoib_neigh_hash *htbl; 1385 struct ipoib_neigh *neigh; 1386 u32 hash_val; 1387 1388 htbl = rcu_dereference_protected(ntbl->htbl, 1389 lockdep_is_held(&priv->lock)); 1390 if (!htbl) { 1391 neigh = NULL; 1392 goto out_unlock; 1393 } 1394 1395 /* need to add a new neigh, but maybe some other thread succeeded? 1396 * recalc hash, maybe hash resize took place so we do a search 1397 */ 1398 hash_val = ipoib_addr_hash(htbl, daddr); 1399 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val], 1400 lockdep_is_held(&priv->lock)); 1401 neigh != NULL; 1402 neigh = rcu_dereference_protected(neigh->hnext, 1403 lockdep_is_held(&priv->lock))) { 1404 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1405 /* found, take one ref on behalf of the caller */ 1406 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1407 /* deleted */ 1408 neigh = NULL; 1409 break; 1410 } 1411 neigh->alive = jiffies; 1412 goto out_unlock; 1413 } 1414 } 1415 1416 neigh = ipoib_neigh_ctor(daddr, dev); 1417 if (!neigh) 1418 goto out_unlock; 1419 1420 /* one ref on behalf of the hash table */ 1421 atomic_inc(&neigh->refcnt); 1422 neigh->alive = jiffies; 1423 /* put in hash */ 1424 rcu_assign_pointer(neigh->hnext, 1425 rcu_dereference_protected(htbl->buckets[hash_val], 1426 lockdep_is_held(&priv->lock))); 1427 rcu_assign_pointer(htbl->buckets[hash_val], neigh); 1428 atomic_inc(&ntbl->entries); 1429 1430 out_unlock: 1431 1432 return neigh; 1433 } 1434 1435 void ipoib_neigh_dtor(struct ipoib_neigh *neigh) 1436 { 1437 /* neigh reference count was dropprd to zero */ 1438 struct net_device *dev = neigh->dev; 1439 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1440 struct sk_buff *skb; 1441 if (neigh->ah) 1442 ipoib_put_ah(neigh->ah); 1443 while ((skb = __skb_dequeue(&neigh->queue))) { 1444 ++dev->stats.tx_dropped; 1445 dev_kfree_skb_any(skb); 1446 } 1447 if (ipoib_cm_get(neigh)) 1448 ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); 1449 ipoib_dbg(ipoib_priv(dev), 1450 "neigh free for %06x %pI6\n", 1451 IPOIB_QPN(neigh->daddr), 1452 neigh->daddr + 4); 1453 kfree(neigh); 1454 if (atomic_dec_and_test(&priv->ntbl.entries)) { 1455 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags)) 1456 complete(&priv->ntbl.flushed); 1457 } 1458 } 1459 1460 static void ipoib_neigh_reclaim(struct rcu_head *rp) 1461 { 1462 /* Called as a result of removal from hash table */ 1463 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu); 1464 /* note TX context may hold another ref */ 1465 ipoib_neigh_put(neigh); 1466 } 1467 1468 void ipoib_neigh_free(struct ipoib_neigh *neigh) 1469 { 1470 struct net_device *dev = neigh->dev; 1471 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1472 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1473 struct ipoib_neigh_hash *htbl; 1474 struct ipoib_neigh __rcu **np; 1475 struct ipoib_neigh *n; 1476 u32 hash_val; 1477 1478 htbl = rcu_dereference_protected(ntbl->htbl, 1479 lockdep_is_held(&priv->lock)); 1480 if (!htbl) 1481 return; 1482 1483 hash_val = ipoib_addr_hash(htbl, neigh->daddr); 1484 np = &htbl->buckets[hash_val]; 1485 for (n = rcu_dereference_protected(*np, 1486 lockdep_is_held(&priv->lock)); 1487 n != NULL; 1488 n = rcu_dereference_protected(*np, 1489 lockdep_is_held(&priv->lock))) { 1490 if (n == neigh) { 1491 /* found */ 1492 rcu_assign_pointer(*np, 1493 rcu_dereference_protected(neigh->hnext, 1494 lockdep_is_held(&priv->lock))); 1495 /* remove from parent list */ 1496 list_del_init(&neigh->list); 1497 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1498 return; 1499 } else { 1500 np = &n->hnext; 1501 } 1502 } 1503 } 1504 1505 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv) 1506 { 1507 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1508 struct ipoib_neigh_hash *htbl; 1509 struct ipoib_neigh __rcu **buckets; 1510 u32 size; 1511 1512 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1513 ntbl->htbl = NULL; 1514 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL); 1515 if (!htbl) 1516 return -ENOMEM; 1517 size = roundup_pow_of_two(arp_tbl.gc_thresh3); 1518 buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL); 1519 if (!buckets) { 1520 kfree(htbl); 1521 return -ENOMEM; 1522 } 1523 htbl->size = size; 1524 htbl->mask = (size - 1); 1525 htbl->buckets = buckets; 1526 RCU_INIT_POINTER(ntbl->htbl, htbl); 1527 htbl->ntbl = ntbl; 1528 atomic_set(&ntbl->entries, 0); 1529 1530 /* start garbage collection */ 1531 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1532 arp_tbl.gc_interval); 1533 1534 return 0; 1535 } 1536 1537 static void neigh_hash_free_rcu(struct rcu_head *head) 1538 { 1539 struct ipoib_neigh_hash *htbl = container_of(head, 1540 struct ipoib_neigh_hash, 1541 rcu); 1542 struct ipoib_neigh __rcu **buckets = htbl->buckets; 1543 struct ipoib_neigh_table *ntbl = htbl->ntbl; 1544 1545 kvfree(buckets); 1546 kfree(htbl); 1547 complete(&ntbl->deleted); 1548 } 1549 1550 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid) 1551 { 1552 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1553 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1554 struct ipoib_neigh_hash *htbl; 1555 unsigned long flags; 1556 int i; 1557 1558 /* remove all neigh connected to a given path or mcast */ 1559 spin_lock_irqsave(&priv->lock, flags); 1560 1561 htbl = rcu_dereference_protected(ntbl->htbl, 1562 lockdep_is_held(&priv->lock)); 1563 1564 if (!htbl) 1565 goto out_unlock; 1566 1567 for (i = 0; i < htbl->size; i++) { 1568 struct ipoib_neigh *neigh; 1569 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1570 1571 while ((neigh = rcu_dereference_protected(*np, 1572 lockdep_is_held(&priv->lock))) != NULL) { 1573 /* delete neighs belong to this parent */ 1574 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) { 1575 rcu_assign_pointer(*np, 1576 rcu_dereference_protected(neigh->hnext, 1577 lockdep_is_held(&priv->lock))); 1578 /* remove from parent list */ 1579 list_del_init(&neigh->list); 1580 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1581 } else { 1582 np = &neigh->hnext; 1583 } 1584 1585 } 1586 } 1587 out_unlock: 1588 spin_unlock_irqrestore(&priv->lock, flags); 1589 } 1590 1591 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv) 1592 { 1593 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1594 struct ipoib_neigh_hash *htbl; 1595 unsigned long flags; 1596 int i, wait_flushed = 0; 1597 1598 init_completion(&priv->ntbl.flushed); 1599 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1600 1601 spin_lock_irqsave(&priv->lock, flags); 1602 1603 htbl = rcu_dereference_protected(ntbl->htbl, 1604 lockdep_is_held(&priv->lock)); 1605 if (!htbl) 1606 goto out_unlock; 1607 1608 wait_flushed = atomic_read(&priv->ntbl.entries); 1609 if (!wait_flushed) 1610 goto free_htbl; 1611 1612 for (i = 0; i < htbl->size; i++) { 1613 struct ipoib_neigh *neigh; 1614 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1615 1616 while ((neigh = rcu_dereference_protected(*np, 1617 lockdep_is_held(&priv->lock))) != NULL) { 1618 rcu_assign_pointer(*np, 1619 rcu_dereference_protected(neigh->hnext, 1620 lockdep_is_held(&priv->lock))); 1621 /* remove from path/mc list */ 1622 list_del_init(&neigh->list); 1623 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1624 } 1625 } 1626 1627 free_htbl: 1628 rcu_assign_pointer(ntbl->htbl, NULL); 1629 call_rcu(&htbl->rcu, neigh_hash_free_rcu); 1630 1631 out_unlock: 1632 spin_unlock_irqrestore(&priv->lock, flags); 1633 if (wait_flushed) 1634 wait_for_completion(&priv->ntbl.flushed); 1635 } 1636 1637 static void ipoib_neigh_hash_uninit(struct net_device *dev) 1638 { 1639 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1640 1641 ipoib_dbg(priv, "%s\n", __func__); 1642 init_completion(&priv->ntbl.deleted); 1643 1644 cancel_delayed_work_sync(&priv->neigh_reap_task); 1645 1646 ipoib_flush_neighs(priv); 1647 1648 wait_for_completion(&priv->ntbl.deleted); 1649 } 1650 1651 static void ipoib_napi_add(struct net_device *dev) 1652 { 1653 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1654 1655 netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC); 1656 netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE); 1657 } 1658 1659 static void ipoib_napi_del(struct net_device *dev) 1660 { 1661 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1662 1663 netif_napi_del(&priv->recv_napi); 1664 netif_napi_del(&priv->send_napi); 1665 } 1666 1667 static void ipoib_dev_uninit_default(struct net_device *dev) 1668 { 1669 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1670 1671 ipoib_transport_dev_cleanup(dev); 1672 1673 ipoib_napi_del(dev); 1674 1675 ipoib_cm_dev_cleanup(dev); 1676 1677 kfree(priv->rx_ring); 1678 vfree(priv->tx_ring); 1679 1680 priv->rx_ring = NULL; 1681 priv->tx_ring = NULL; 1682 } 1683 1684 static int ipoib_dev_init_default(struct net_device *dev) 1685 { 1686 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1687 1688 ipoib_napi_add(dev); 1689 1690 /* Allocate RX/TX "rings" to hold queued skbs */ 1691 priv->rx_ring = kcalloc(ipoib_recvq_size, 1692 sizeof(*priv->rx_ring), 1693 GFP_KERNEL); 1694 if (!priv->rx_ring) 1695 goto out; 1696 1697 priv->tx_ring = vzalloc(array_size(ipoib_sendq_size, 1698 sizeof(*priv->tx_ring))); 1699 if (!priv->tx_ring) { 1700 pr_warn("%s: failed to allocate TX ring (%d entries)\n", 1701 priv->ca->name, ipoib_sendq_size); 1702 goto out_rx_ring_cleanup; 1703 } 1704 1705 /* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */ 1706 1707 if (ipoib_transport_dev_init(dev, priv->ca)) { 1708 pr_warn("%s: ipoib_transport_dev_init failed\n", 1709 priv->ca->name); 1710 goto out_tx_ring_cleanup; 1711 } 1712 1713 /* after qp created set dev address */ 1714 priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff; 1715 priv->dev->dev_addr[2] = (priv->qp->qp_num >> 8) & 0xff; 1716 priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff; 1717 1718 return 0; 1719 1720 out_tx_ring_cleanup: 1721 vfree(priv->tx_ring); 1722 1723 out_rx_ring_cleanup: 1724 kfree(priv->rx_ring); 1725 1726 out: 1727 ipoib_napi_del(dev); 1728 return -ENOMEM; 1729 } 1730 1731 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr, 1732 int cmd) 1733 { 1734 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1735 1736 if (!priv->rn_ops->ndo_do_ioctl) 1737 return -EOPNOTSUPP; 1738 1739 return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd); 1740 } 1741 1742 static int ipoib_dev_init(struct net_device *dev) 1743 { 1744 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1745 int ret = -ENOMEM; 1746 1747 priv->qp = NULL; 1748 1749 /* 1750 * the various IPoIB tasks assume they will never race against 1751 * themselves, so always use a single thread workqueue 1752 */ 1753 priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM); 1754 if (!priv->wq) { 1755 pr_warn("%s: failed to allocate device WQ\n", dev->name); 1756 goto out; 1757 } 1758 1759 /* create pd, which used both for control and datapath*/ 1760 priv->pd = ib_alloc_pd(priv->ca, 0); 1761 if (IS_ERR(priv->pd)) { 1762 pr_warn("%s: failed to allocate PD\n", priv->ca->name); 1763 goto clean_wq; 1764 } 1765 1766 ret = priv->rn_ops->ndo_init(dev); 1767 if (ret) { 1768 pr_warn("%s failed to init HW resource\n", dev->name); 1769 goto out_free_pd; 1770 } 1771 1772 ret = ipoib_neigh_hash_init(priv); 1773 if (ret) { 1774 pr_warn("%s failed to init neigh hash\n", dev->name); 1775 goto out_dev_uninit; 1776 } 1777 1778 if (dev->flags & IFF_UP) { 1779 if (ipoib_ib_dev_open(dev)) { 1780 pr_warn("%s failed to open device\n", dev->name); 1781 ret = -ENODEV; 1782 goto out_hash_uninit; 1783 } 1784 } 1785 1786 return 0; 1787 1788 out_hash_uninit: 1789 ipoib_neigh_hash_uninit(dev); 1790 1791 out_dev_uninit: 1792 ipoib_ib_dev_cleanup(dev); 1793 1794 out_free_pd: 1795 if (priv->pd) { 1796 ib_dealloc_pd(priv->pd); 1797 priv->pd = NULL; 1798 } 1799 1800 clean_wq: 1801 if (priv->wq) { 1802 destroy_workqueue(priv->wq); 1803 priv->wq = NULL; 1804 } 1805 1806 out: 1807 return ret; 1808 } 1809 1810 /* 1811 * This must be called before doing an unregister_netdev on a parent device to 1812 * shutdown the IB event handler. 1813 */ 1814 static void ipoib_parent_unregister_pre(struct net_device *ndev) 1815 { 1816 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 1817 1818 /* 1819 * ipoib_set_mac checks netif_running before pushing work, clearing 1820 * running ensures the it will not add more work. 1821 */ 1822 rtnl_lock(); 1823 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL); 1824 rtnl_unlock(); 1825 1826 /* ipoib_event() cannot be running once this returns */ 1827 ib_unregister_event_handler(&priv->event_handler); 1828 1829 /* 1830 * Work on the queue grabs the rtnl lock, so this cannot be done while 1831 * also holding it. 1832 */ 1833 flush_workqueue(ipoib_workqueue); 1834 } 1835 1836 static void ipoib_set_dev_features(struct ipoib_dev_priv *priv) 1837 { 1838 priv->hca_caps = priv->ca->attrs.device_cap_flags; 1839 1840 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { 1841 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM; 1842 1843 if (priv->hca_caps & IB_DEVICE_UD_TSO) 1844 priv->dev->hw_features |= NETIF_F_TSO; 1845 1846 priv->dev->features |= priv->dev->hw_features; 1847 } 1848 } 1849 1850 static int ipoib_parent_init(struct net_device *ndev) 1851 { 1852 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 1853 struct ib_port_attr attr; 1854 int result; 1855 1856 result = ib_query_port(priv->ca, priv->port, &attr); 1857 if (result) { 1858 pr_warn("%s: ib_query_port %d failed\n", priv->ca->name, 1859 priv->port); 1860 return result; 1861 } 1862 priv->max_ib_mtu = rdma_mtu_from_attr(priv->ca, priv->port, &attr); 1863 1864 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey); 1865 if (result) { 1866 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n", 1867 priv->ca->name, priv->port, result); 1868 return result; 1869 } 1870 1871 result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid); 1872 if (result) { 1873 pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n", 1874 priv->ca->name, priv->port, result); 1875 return result; 1876 } 1877 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, 1878 sizeof(union ib_gid)); 1879 1880 SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent); 1881 priv->dev->dev_port = priv->port - 1; 1882 /* Let's set this one too for backwards compatibility. */ 1883 priv->dev->dev_id = priv->port - 1; 1884 1885 return 0; 1886 } 1887 1888 static void ipoib_child_init(struct net_device *ndev) 1889 { 1890 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 1891 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); 1892 1893 priv->max_ib_mtu = ppriv->max_ib_mtu; 1894 set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags); 1895 if (memchr_inv(priv->dev->dev_addr, 0, INFINIBAND_ALEN)) 1896 memcpy(&priv->local_gid, priv->dev->dev_addr + 4, 1897 sizeof(priv->local_gid)); 1898 else { 1899 memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, 1900 INFINIBAND_ALEN); 1901 memcpy(&priv->local_gid, &ppriv->local_gid, 1902 sizeof(priv->local_gid)); 1903 } 1904 } 1905 1906 static int ipoib_ndo_init(struct net_device *ndev) 1907 { 1908 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 1909 int rc; 1910 struct rdma_netdev *rn = netdev_priv(ndev); 1911 1912 if (priv->parent) { 1913 ipoib_child_init(ndev); 1914 } else { 1915 rc = ipoib_parent_init(ndev); 1916 if (rc) 1917 return rc; 1918 } 1919 1920 /* MTU will be reset when mcast join happens */ 1921 ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); 1922 priv->mcast_mtu = priv->admin_mtu = ndev->mtu; 1923 rn->mtu = priv->mcast_mtu; 1924 ndev->max_mtu = IPOIB_CM_MTU; 1925 1926 ndev->neigh_priv_len = sizeof(struct ipoib_neigh); 1927 1928 /* 1929 * Set the full membership bit, so that we join the right 1930 * broadcast group, etc. 1931 */ 1932 priv->pkey |= 0x8000; 1933 1934 ndev->broadcast[8] = priv->pkey >> 8; 1935 ndev->broadcast[9] = priv->pkey & 0xff; 1936 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 1937 1938 ipoib_set_dev_features(priv); 1939 1940 rc = ipoib_dev_init(ndev); 1941 if (rc) { 1942 pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n", 1943 priv->ca->name, priv->dev->name, priv->port, rc); 1944 return rc; 1945 } 1946 1947 if (priv->parent) { 1948 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); 1949 1950 dev_hold(priv->parent); 1951 1952 down_write(&ppriv->vlan_rwsem); 1953 list_add_tail(&priv->list, &ppriv->child_intfs); 1954 up_write(&ppriv->vlan_rwsem); 1955 } 1956 1957 return 0; 1958 } 1959 1960 static void ipoib_ndo_uninit(struct net_device *dev) 1961 { 1962 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1963 1964 ASSERT_RTNL(); 1965 1966 /* 1967 * ipoib_remove_one guarantees the children are removed before the 1968 * parent, and that is the only place where a parent can be removed. 1969 */ 1970 WARN_ON(!list_empty(&priv->child_intfs)); 1971 1972 if (priv->parent) { 1973 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); 1974 1975 down_write(&ppriv->vlan_rwsem); 1976 list_del(&priv->list); 1977 up_write(&ppriv->vlan_rwsem); 1978 } 1979 1980 ipoib_neigh_hash_uninit(dev); 1981 1982 ipoib_ib_dev_cleanup(dev); 1983 1984 /* no more works over the priv->wq */ 1985 if (priv->wq) { 1986 /* See ipoib_mcast_carrier_on_task() */ 1987 WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)); 1988 flush_workqueue(priv->wq); 1989 destroy_workqueue(priv->wq); 1990 priv->wq = NULL; 1991 } 1992 1993 if (priv->parent) 1994 dev_put(priv->parent); 1995 } 1996 1997 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state) 1998 { 1999 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2000 2001 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state); 2002 } 2003 2004 static int ipoib_get_vf_config(struct net_device *dev, int vf, 2005 struct ifla_vf_info *ivf) 2006 { 2007 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2008 int err; 2009 2010 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf); 2011 if (err) 2012 return err; 2013 2014 ivf->vf = vf; 2015 memcpy(ivf->mac, dev->dev_addr, dev->addr_len); 2016 2017 return 0; 2018 } 2019 2020 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type) 2021 { 2022 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2023 2024 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID) 2025 return -EINVAL; 2026 2027 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type); 2028 } 2029 2030 static int ipoib_get_vf_guid(struct net_device *dev, int vf, 2031 struct ifla_vf_guid *node_guid, 2032 struct ifla_vf_guid *port_guid) 2033 { 2034 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2035 2036 return ib_get_vf_guid(priv->ca, vf, priv->port, node_guid, port_guid); 2037 } 2038 2039 static int ipoib_get_vf_stats(struct net_device *dev, int vf, 2040 struct ifla_vf_stats *vf_stats) 2041 { 2042 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2043 2044 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats); 2045 } 2046 2047 static const struct header_ops ipoib_header_ops = { 2048 .create = ipoib_hard_header, 2049 }; 2050 2051 static const struct net_device_ops ipoib_netdev_ops_pf = { 2052 .ndo_init = ipoib_ndo_init, 2053 .ndo_uninit = ipoib_ndo_uninit, 2054 .ndo_open = ipoib_open, 2055 .ndo_stop = ipoib_stop, 2056 .ndo_change_mtu = ipoib_change_mtu, 2057 .ndo_fix_features = ipoib_fix_features, 2058 .ndo_start_xmit = ipoib_start_xmit, 2059 .ndo_tx_timeout = ipoib_timeout, 2060 .ndo_set_rx_mode = ipoib_set_mcast_list, 2061 .ndo_get_iflink = ipoib_get_iflink, 2062 .ndo_set_vf_link_state = ipoib_set_vf_link_state, 2063 .ndo_get_vf_config = ipoib_get_vf_config, 2064 .ndo_get_vf_stats = ipoib_get_vf_stats, 2065 .ndo_get_vf_guid = ipoib_get_vf_guid, 2066 .ndo_set_vf_guid = ipoib_set_vf_guid, 2067 .ndo_set_mac_address = ipoib_set_mac, 2068 .ndo_get_stats64 = ipoib_get_stats, 2069 .ndo_do_ioctl = ipoib_ioctl, 2070 }; 2071 2072 static const struct net_device_ops ipoib_netdev_ops_vf = { 2073 .ndo_init = ipoib_ndo_init, 2074 .ndo_uninit = ipoib_ndo_uninit, 2075 .ndo_open = ipoib_open, 2076 .ndo_stop = ipoib_stop, 2077 .ndo_change_mtu = ipoib_change_mtu, 2078 .ndo_fix_features = ipoib_fix_features, 2079 .ndo_start_xmit = ipoib_start_xmit, 2080 .ndo_tx_timeout = ipoib_timeout, 2081 .ndo_set_rx_mode = ipoib_set_mcast_list, 2082 .ndo_get_iflink = ipoib_get_iflink, 2083 .ndo_get_stats64 = ipoib_get_stats, 2084 .ndo_do_ioctl = ipoib_ioctl, 2085 }; 2086 2087 static const struct net_device_ops ipoib_netdev_default_pf = { 2088 .ndo_init = ipoib_dev_init_default, 2089 .ndo_uninit = ipoib_dev_uninit_default, 2090 .ndo_open = ipoib_ib_dev_open_default, 2091 .ndo_stop = ipoib_ib_dev_stop_default, 2092 }; 2093 2094 void ipoib_setup_common(struct net_device *dev) 2095 { 2096 dev->header_ops = &ipoib_header_ops; 2097 dev->netdev_ops = &ipoib_netdev_default_pf; 2098 2099 ipoib_set_ethtool_ops(dev); 2100 2101 dev->watchdog_timeo = HZ; 2102 2103 dev->flags |= IFF_BROADCAST | IFF_MULTICAST; 2104 2105 dev->hard_header_len = IPOIB_HARD_LEN; 2106 dev->addr_len = INFINIBAND_ALEN; 2107 dev->type = ARPHRD_INFINIBAND; 2108 dev->tx_queue_len = ipoib_sendq_size * 2; 2109 dev->features = (NETIF_F_VLAN_CHALLENGED | 2110 NETIF_F_HIGHDMA); 2111 netif_keep_dst(dev); 2112 2113 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); 2114 2115 /* 2116 * unregister_netdev always frees the netdev, we use this mode 2117 * consistently to unify all the various unregister paths, including 2118 * those connected to rtnl_link_ops which require it. 2119 */ 2120 dev->needs_free_netdev = true; 2121 } 2122 2123 static void ipoib_build_priv(struct net_device *dev) 2124 { 2125 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2126 2127 priv->dev = dev; 2128 spin_lock_init(&priv->lock); 2129 init_rwsem(&priv->vlan_rwsem); 2130 mutex_init(&priv->mcast_mutex); 2131 2132 INIT_LIST_HEAD(&priv->path_list); 2133 INIT_LIST_HEAD(&priv->child_intfs); 2134 INIT_LIST_HEAD(&priv->dead_ahs); 2135 INIT_LIST_HEAD(&priv->multicast_list); 2136 2137 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); 2138 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task); 2139 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light); 2140 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal); 2141 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy); 2142 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); 2143 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); 2144 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh); 2145 } 2146 2147 static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u8 port, 2148 const char *name) 2149 { 2150 struct net_device *dev; 2151 2152 dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name, 2153 NET_NAME_UNKNOWN, ipoib_setup_common); 2154 if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP) 2155 return dev; 2156 2157 dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN, 2158 ipoib_setup_common); 2159 if (!dev) 2160 return ERR_PTR(-ENOMEM); 2161 return dev; 2162 } 2163 2164 int ipoib_intf_init(struct ib_device *hca, u8 port, const char *name, 2165 struct net_device *dev) 2166 { 2167 struct rdma_netdev *rn = netdev_priv(dev); 2168 struct ipoib_dev_priv *priv; 2169 int rc; 2170 2171 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2172 if (!priv) 2173 return -ENOMEM; 2174 2175 priv->ca = hca; 2176 priv->port = port; 2177 2178 rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name, 2179 NET_NAME_UNKNOWN, ipoib_setup_common, dev); 2180 if (rc) { 2181 if (rc != -EOPNOTSUPP) 2182 goto out; 2183 2184 rn->send = ipoib_send; 2185 rn->attach_mcast = ipoib_mcast_attach; 2186 rn->detach_mcast = ipoib_mcast_detach; 2187 rn->hca = hca; 2188 } 2189 2190 priv->rn_ops = dev->netdev_ops; 2191 2192 if (hca->attrs.device_cap_flags & IB_DEVICE_VIRTUAL_FUNCTION) 2193 dev->netdev_ops = &ipoib_netdev_ops_vf; 2194 else 2195 dev->netdev_ops = &ipoib_netdev_ops_pf; 2196 2197 rn->clnt_priv = priv; 2198 /* 2199 * Only the child register_netdev flows can handle priv_destructor 2200 * being set, so we force it to NULL here and handle manually until it 2201 * is safe to turn on. 2202 */ 2203 priv->next_priv_destructor = dev->priv_destructor; 2204 dev->priv_destructor = NULL; 2205 2206 ipoib_build_priv(dev); 2207 2208 return 0; 2209 2210 out: 2211 kfree(priv); 2212 return rc; 2213 } 2214 2215 struct net_device *ipoib_intf_alloc(struct ib_device *hca, u8 port, 2216 const char *name) 2217 { 2218 struct net_device *dev; 2219 int rc; 2220 2221 dev = ipoib_alloc_netdev(hca, port, name); 2222 if (IS_ERR(dev)) 2223 return dev; 2224 2225 rc = ipoib_intf_init(hca, port, name, dev); 2226 if (rc) { 2227 free_netdev(dev); 2228 return ERR_PTR(rc); 2229 } 2230 2231 /* 2232 * Upon success the caller must ensure ipoib_intf_free is called or 2233 * register_netdevice succeed'd and priv_destructor is set to 2234 * ipoib_intf_free. 2235 */ 2236 return dev; 2237 } 2238 2239 void ipoib_intf_free(struct net_device *dev) 2240 { 2241 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2242 struct rdma_netdev *rn = netdev_priv(dev); 2243 2244 dev->priv_destructor = priv->next_priv_destructor; 2245 if (dev->priv_destructor) 2246 dev->priv_destructor(dev); 2247 2248 /* 2249 * There are some error flows around register_netdev failing that may 2250 * attempt to call priv_destructor twice, prevent that from happening. 2251 */ 2252 dev->priv_destructor = NULL; 2253 2254 /* unregister/destroy is very complicated. Make bugs more obvious. */ 2255 rn->clnt_priv = NULL; 2256 2257 kfree(priv); 2258 } 2259 2260 static ssize_t show_pkey(struct device *dev, 2261 struct device_attribute *attr, char *buf) 2262 { 2263 struct net_device *ndev = to_net_dev(dev); 2264 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2265 2266 return sprintf(buf, "0x%04x\n", priv->pkey); 2267 } 2268 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 2269 2270 static ssize_t show_umcast(struct device *dev, 2271 struct device_attribute *attr, char *buf) 2272 { 2273 struct net_device *ndev = to_net_dev(dev); 2274 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2275 2276 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); 2277 } 2278 2279 void ipoib_set_umcast(struct net_device *ndev, int umcast_val) 2280 { 2281 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2282 2283 if (umcast_val > 0) { 2284 set_bit(IPOIB_FLAG_UMCAST, &priv->flags); 2285 ipoib_warn(priv, "ignoring multicast groups joined directly " 2286 "by userspace\n"); 2287 } else 2288 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); 2289 } 2290 2291 static ssize_t set_umcast(struct device *dev, 2292 struct device_attribute *attr, 2293 const char *buf, size_t count) 2294 { 2295 unsigned long umcast_val = simple_strtoul(buf, NULL, 0); 2296 2297 ipoib_set_umcast(to_net_dev(dev), umcast_val); 2298 2299 return count; 2300 } 2301 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); 2302 2303 int ipoib_add_umcast_attr(struct net_device *dev) 2304 { 2305 return device_create_file(&dev->dev, &dev_attr_umcast); 2306 } 2307 2308 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid) 2309 { 2310 struct ipoib_dev_priv *child_priv; 2311 struct net_device *netdev = priv->dev; 2312 2313 netif_addr_lock_bh(netdev); 2314 2315 memcpy(&priv->local_gid.global.interface_id, 2316 &gid->global.interface_id, 2317 sizeof(gid->global.interface_id)); 2318 memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid)); 2319 clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 2320 2321 netif_addr_unlock_bh(netdev); 2322 2323 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 2324 down_read(&priv->vlan_rwsem); 2325 list_for_each_entry(child_priv, &priv->child_intfs, list) 2326 set_base_guid(child_priv, gid); 2327 up_read(&priv->vlan_rwsem); 2328 } 2329 } 2330 2331 static int ipoib_check_lladdr(struct net_device *dev, 2332 struct sockaddr_storage *ss) 2333 { 2334 union ib_gid *gid = (union ib_gid *)(ss->__data + 4); 2335 int ret = 0; 2336 2337 netif_addr_lock_bh(dev); 2338 2339 /* Make sure the QPN, reserved and subnet prefix match the current 2340 * lladdr, it also makes sure the lladdr is unicast. 2341 */ 2342 if (memcmp(dev->dev_addr, ss->__data, 2343 4 + sizeof(gid->global.subnet_prefix)) || 2344 gid->global.interface_id == 0) 2345 ret = -EINVAL; 2346 2347 netif_addr_unlock_bh(dev); 2348 2349 return ret; 2350 } 2351 2352 static int ipoib_set_mac(struct net_device *dev, void *addr) 2353 { 2354 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2355 struct sockaddr_storage *ss = addr; 2356 int ret; 2357 2358 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) 2359 return -EBUSY; 2360 2361 ret = ipoib_check_lladdr(dev, ss); 2362 if (ret) 2363 return ret; 2364 2365 set_base_guid(priv, (union ib_gid *)(ss->__data + 4)); 2366 2367 queue_work(ipoib_workqueue, &priv->flush_light); 2368 2369 return 0; 2370 } 2371 2372 static ssize_t create_child(struct device *dev, 2373 struct device_attribute *attr, 2374 const char *buf, size_t count) 2375 { 2376 int pkey; 2377 int ret; 2378 2379 if (sscanf(buf, "%i", &pkey) != 1) 2380 return -EINVAL; 2381 2382 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000) 2383 return -EINVAL; 2384 2385 ret = ipoib_vlan_add(to_net_dev(dev), pkey); 2386 2387 return ret ? ret : count; 2388 } 2389 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child); 2390 2391 static ssize_t delete_child(struct device *dev, 2392 struct device_attribute *attr, 2393 const char *buf, size_t count) 2394 { 2395 int pkey; 2396 int ret; 2397 2398 if (sscanf(buf, "%i", &pkey) != 1) 2399 return -EINVAL; 2400 2401 if (pkey < 0 || pkey > 0xffff) 2402 return -EINVAL; 2403 2404 ret = ipoib_vlan_delete(to_net_dev(dev), pkey); 2405 2406 return ret ? ret : count; 2407 2408 } 2409 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child); 2410 2411 int ipoib_add_pkey_attr(struct net_device *dev) 2412 { 2413 return device_create_file(&dev->dev, &dev_attr_pkey); 2414 } 2415 2416 /* 2417 * We erroneously exposed the iface's port number in the dev_id 2418 * sysfs field long after dev_port was introduced for that purpose[1], 2419 * and we need to stop everyone from relying on that. 2420 * Let's overload the shower routine for the dev_id file here 2421 * to gently bring the issue up. 2422 * 2423 * [1] https://www.spinics.net/lists/netdev/msg272123.html 2424 */ 2425 static ssize_t dev_id_show(struct device *dev, 2426 struct device_attribute *attr, char *buf) 2427 { 2428 struct net_device *ndev = to_net_dev(dev); 2429 2430 /* 2431 * ndev->dev_port will be equal to 0 in old kernel prior to commit 2432 * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface 2433 * port numbers") Zero was chosen as special case for user space 2434 * applications to fallback and query dev_id to check if it has 2435 * different value or not. 2436 * 2437 * Don't print warning in such scenario. 2438 * 2439 * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358 2440 */ 2441 if (ndev->dev_port && ndev->dev_id == ndev->dev_port) 2442 netdev_info_once(ndev, 2443 "\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n", 2444 current->comm); 2445 2446 return sprintf(buf, "%#x\n", ndev->dev_id); 2447 } 2448 static DEVICE_ATTR_RO(dev_id); 2449 2450 static int ipoib_intercept_dev_id_attr(struct net_device *dev) 2451 { 2452 device_remove_file(&dev->dev, &dev_attr_dev_id); 2453 return device_create_file(&dev->dev, &dev_attr_dev_id); 2454 } 2455 2456 static struct net_device *ipoib_add_port(const char *format, 2457 struct ib_device *hca, u8 port) 2458 { 2459 struct rtnl_link_ops *ops = ipoib_get_link_ops(); 2460 struct rdma_netdev_alloc_params params; 2461 struct ipoib_dev_priv *priv; 2462 struct net_device *ndev; 2463 int result; 2464 2465 ndev = ipoib_intf_alloc(hca, port, format); 2466 if (IS_ERR(ndev)) { 2467 pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port, 2468 PTR_ERR(ndev)); 2469 return ndev; 2470 } 2471 priv = ipoib_priv(ndev); 2472 2473 INIT_IB_EVENT_HANDLER(&priv->event_handler, 2474 priv->ca, ipoib_event); 2475 ib_register_event_handler(&priv->event_handler); 2476 2477 /* call event handler to ensure pkey in sync */ 2478 queue_work(ipoib_workqueue, &priv->flush_heavy); 2479 2480 result = register_netdev(ndev); 2481 if (result) { 2482 pr_warn("%s: couldn't register ipoib port %d; error %d\n", 2483 hca->name, port, result); 2484 2485 ipoib_parent_unregister_pre(ndev); 2486 ipoib_intf_free(ndev); 2487 free_netdev(ndev); 2488 2489 return ERR_PTR(result); 2490 } 2491 2492 if (hca->ops.rdma_netdev_get_params) { 2493 int rc = hca->ops.rdma_netdev_get_params(hca, port, 2494 RDMA_NETDEV_IPOIB, 2495 ¶ms); 2496 2497 if (!rc && ops->priv_size < params.sizeof_priv) 2498 ops->priv_size = params.sizeof_priv; 2499 } 2500 /* 2501 * We cannot set priv_destructor before register_netdev because we 2502 * need priv to be always valid during the error flow to execute 2503 * ipoib_parent_unregister_pre(). Instead handle it manually and only 2504 * enter priv_destructor mode once we are completely registered. 2505 */ 2506 ndev->priv_destructor = ipoib_intf_free; 2507 2508 if (ipoib_intercept_dev_id_attr(ndev)) 2509 goto sysfs_failed; 2510 if (ipoib_cm_add_mode_attr(ndev)) 2511 goto sysfs_failed; 2512 if (ipoib_add_pkey_attr(ndev)) 2513 goto sysfs_failed; 2514 if (ipoib_add_umcast_attr(ndev)) 2515 goto sysfs_failed; 2516 if (device_create_file(&ndev->dev, &dev_attr_create_child)) 2517 goto sysfs_failed; 2518 if (device_create_file(&ndev->dev, &dev_attr_delete_child)) 2519 goto sysfs_failed; 2520 2521 return ndev; 2522 2523 sysfs_failed: 2524 ipoib_parent_unregister_pre(ndev); 2525 unregister_netdev(ndev); 2526 return ERR_PTR(-ENOMEM); 2527 } 2528 2529 static int ipoib_add_one(struct ib_device *device) 2530 { 2531 struct list_head *dev_list; 2532 struct net_device *dev; 2533 struct ipoib_dev_priv *priv; 2534 unsigned int p; 2535 int count = 0; 2536 2537 dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL); 2538 if (!dev_list) 2539 return -ENOMEM; 2540 2541 INIT_LIST_HEAD(dev_list); 2542 2543 rdma_for_each_port (device, p) { 2544 if (!rdma_protocol_ib(device, p)) 2545 continue; 2546 dev = ipoib_add_port("ib%d", device, p); 2547 if (!IS_ERR(dev)) { 2548 priv = ipoib_priv(dev); 2549 list_add_tail(&priv->list, dev_list); 2550 count++; 2551 } 2552 } 2553 2554 if (!count) { 2555 kfree(dev_list); 2556 return -EOPNOTSUPP; 2557 } 2558 2559 ib_set_client_data(device, &ipoib_client, dev_list); 2560 return 0; 2561 } 2562 2563 static void ipoib_remove_one(struct ib_device *device, void *client_data) 2564 { 2565 struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv; 2566 struct list_head *dev_list = client_data; 2567 2568 list_for_each_entry_safe(priv, tmp, dev_list, list) { 2569 LIST_HEAD(head); 2570 ipoib_parent_unregister_pre(priv->dev); 2571 2572 rtnl_lock(); 2573 2574 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, 2575 list) 2576 unregister_netdevice_queue(cpriv->dev, &head); 2577 unregister_netdevice_queue(priv->dev, &head); 2578 unregister_netdevice_many(&head); 2579 2580 rtnl_unlock(); 2581 } 2582 2583 kfree(dev_list); 2584 } 2585 2586 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2587 static struct notifier_block ipoib_netdev_notifier = { 2588 .notifier_call = ipoib_netdev_event, 2589 }; 2590 #endif 2591 2592 static int __init ipoib_init_module(void) 2593 { 2594 int ret; 2595 2596 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); 2597 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); 2598 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); 2599 2600 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); 2601 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); 2602 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE); 2603 #ifdef CONFIG_INFINIBAND_IPOIB_CM 2604 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); 2605 ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0); 2606 #endif 2607 2608 /* 2609 * When copying small received packets, we only copy from the 2610 * linear data part of the SKB, so we rely on this condition. 2611 */ 2612 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE); 2613 2614 ipoib_register_debugfs(); 2615 2616 /* 2617 * We create a global workqueue here that is used for all flush 2618 * operations. However, if you attempt to flush a workqueue 2619 * from a task on that same workqueue, it deadlocks the system. 2620 * We want to be able to flush the tasks associated with a 2621 * specific net device, so we also create a workqueue for each 2622 * netdevice. We queue up the tasks for that device only on 2623 * its private workqueue, and we only queue up flush events 2624 * on our global flush workqueue. This avoids the deadlocks. 2625 */ 2626 ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0); 2627 if (!ipoib_workqueue) { 2628 ret = -ENOMEM; 2629 goto err_fs; 2630 } 2631 2632 ib_sa_register_client(&ipoib_sa_client); 2633 2634 ret = ib_register_client(&ipoib_client); 2635 if (ret) 2636 goto err_sa; 2637 2638 ret = ipoib_netlink_init(); 2639 if (ret) 2640 goto err_client; 2641 2642 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2643 register_netdevice_notifier(&ipoib_netdev_notifier); 2644 #endif 2645 return 0; 2646 2647 err_client: 2648 ib_unregister_client(&ipoib_client); 2649 2650 err_sa: 2651 ib_sa_unregister_client(&ipoib_sa_client); 2652 destroy_workqueue(ipoib_workqueue); 2653 2654 err_fs: 2655 ipoib_unregister_debugfs(); 2656 2657 return ret; 2658 } 2659 2660 static void __exit ipoib_cleanup_module(void) 2661 { 2662 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2663 unregister_netdevice_notifier(&ipoib_netdev_notifier); 2664 #endif 2665 ipoib_netlink_fini(); 2666 ib_unregister_client(&ipoib_client); 2667 ib_sa_unregister_client(&ipoib_sa_client); 2668 ipoib_unregister_debugfs(); 2669 destroy_workqueue(ipoib_workqueue); 2670 } 2671 2672 module_init(ipoib_init_module); 2673 module_exit(ipoib_cleanup_module); 2674