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 #define DRV_VERSION "1.0.0" 56 57 const char ipoib_driver_version[] = DRV_VERSION; 58 59 MODULE_AUTHOR("Roland Dreier"); 60 MODULE_DESCRIPTION("IP-over-InfiniBand net driver"); 61 MODULE_LICENSE("Dual BSD/GPL"); 62 63 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE; 64 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE; 65 66 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444); 67 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue"); 68 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444); 69 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue"); 70 71 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 72 int ipoib_debug_level; 73 74 module_param_named(debug_level, ipoib_debug_level, int, 0644); 75 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0"); 76 #endif 77 78 struct ipoib_path_iter { 79 struct net_device *dev; 80 struct ipoib_path path; 81 }; 82 83 static const u8 ipv4_bcast_addr[] = { 84 0x00, 0xff, 0xff, 0xff, 85 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, 86 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff 87 }; 88 89 struct workqueue_struct *ipoib_workqueue; 90 91 struct ib_sa_client ipoib_sa_client; 92 93 static void ipoib_add_one(struct ib_device *device); 94 static void ipoib_remove_one(struct ib_device *device, void *client_data); 95 static void ipoib_neigh_reclaim(struct rcu_head *rp); 96 static struct net_device *ipoib_get_net_dev_by_params( 97 struct ib_device *dev, u8 port, u16 pkey, 98 const union ib_gid *gid, const struct sockaddr *addr, 99 void *client_data); 100 static int ipoib_set_mac(struct net_device *dev, void *addr); 101 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr, 102 int cmd); 103 104 static struct ib_client ipoib_client = { 105 .name = "ipoib", 106 .add = ipoib_add_one, 107 .remove = ipoib_remove_one, 108 .get_net_dev_by_params = ipoib_get_net_dev_by_params, 109 }; 110 111 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 112 static int ipoib_netdev_event(struct notifier_block *this, 113 unsigned long event, void *ptr) 114 { 115 struct netdev_notifier_info *ni = ptr; 116 struct net_device *dev = ni->dev; 117 118 if (dev->netdev_ops->ndo_open != ipoib_open) 119 return NOTIFY_DONE; 120 121 switch (event) { 122 case NETDEV_REGISTER: 123 ipoib_create_debug_files(dev); 124 break; 125 case NETDEV_CHANGENAME: 126 ipoib_delete_debug_files(dev); 127 ipoib_create_debug_files(dev); 128 break; 129 case NETDEV_UNREGISTER: 130 ipoib_delete_debug_files(dev); 131 break; 132 } 133 134 return NOTIFY_DONE; 135 } 136 #endif 137 138 int ipoib_open(struct net_device *dev) 139 { 140 struct ipoib_dev_priv *priv = ipoib_priv(dev); 141 142 ipoib_dbg(priv, "bringing up interface\n"); 143 144 netif_carrier_off(dev); 145 146 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 147 148 priv->sm_fullmember_sendonly_support = false; 149 150 if (ipoib_ib_dev_open(dev)) { 151 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 152 return 0; 153 goto err_disable; 154 } 155 156 ipoib_ib_dev_up(dev); 157 158 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 159 struct ipoib_dev_priv *cpriv; 160 161 /* Bring up any child interfaces too */ 162 down_read(&priv->vlan_rwsem); 163 list_for_each_entry(cpriv, &priv->child_intfs, list) { 164 int flags; 165 166 flags = cpriv->dev->flags; 167 if (flags & IFF_UP) 168 continue; 169 170 dev_change_flags(cpriv->dev, flags | IFF_UP); 171 } 172 up_read(&priv->vlan_rwsem); 173 } 174 175 netif_start_queue(dev); 176 177 return 0; 178 179 err_disable: 180 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 181 182 return -EINVAL; 183 } 184 185 static int ipoib_stop(struct net_device *dev) 186 { 187 struct ipoib_dev_priv *priv = ipoib_priv(dev); 188 189 ipoib_dbg(priv, "stopping interface\n"); 190 191 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 192 193 netif_stop_queue(dev); 194 195 ipoib_ib_dev_down(dev); 196 ipoib_ib_dev_stop(dev); 197 198 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 199 struct ipoib_dev_priv *cpriv; 200 201 /* Bring down any child interfaces too */ 202 down_read(&priv->vlan_rwsem); 203 list_for_each_entry(cpriv, &priv->child_intfs, list) { 204 int flags; 205 206 flags = cpriv->dev->flags; 207 if (!(flags & IFF_UP)) 208 continue; 209 210 dev_change_flags(cpriv->dev, flags & ~IFF_UP); 211 } 212 up_read(&priv->vlan_rwsem); 213 } 214 215 return 0; 216 } 217 218 static void ipoib_uninit(struct net_device *dev) 219 { 220 ipoib_dev_cleanup(dev); 221 } 222 223 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features) 224 { 225 struct ipoib_dev_priv *priv = ipoib_priv(dev); 226 227 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 228 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO); 229 230 return features; 231 } 232 233 static int ipoib_change_mtu(struct net_device *dev, int new_mtu) 234 { 235 struct ipoib_dev_priv *priv = ipoib_priv(dev); 236 int ret = 0; 237 238 /* dev->mtu > 2K ==> connected mode */ 239 if (ipoib_cm_admin_enabled(dev)) { 240 if (new_mtu > ipoib_cm_max_mtu(dev)) 241 return -EINVAL; 242 243 if (new_mtu > priv->mcast_mtu) 244 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n", 245 priv->mcast_mtu); 246 247 dev->mtu = new_mtu; 248 return 0; 249 } 250 251 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) 252 return -EINVAL; 253 254 priv->admin_mtu = new_mtu; 255 256 if (priv->mcast_mtu < priv->admin_mtu) 257 ipoib_dbg(priv, "MTU must be smaller than the underlying " 258 "link layer MTU - 4 (%u)\n", priv->mcast_mtu); 259 260 new_mtu = min(priv->mcast_mtu, priv->admin_mtu); 261 262 if (priv->rn_ops->ndo_change_mtu) { 263 bool carrier_status = netif_carrier_ok(dev); 264 265 netif_carrier_off(dev); 266 267 /* notify lower level on the real mtu */ 268 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu); 269 270 if (carrier_status) 271 netif_carrier_on(dev); 272 } else { 273 dev->mtu = new_mtu; 274 } 275 276 return ret; 277 } 278 279 static void ipoib_get_stats(struct net_device *dev, 280 struct rtnl_link_stats64 *stats) 281 { 282 struct ipoib_dev_priv *priv = ipoib_priv(dev); 283 284 if (priv->rn_ops->ndo_get_stats64) 285 priv->rn_ops->ndo_get_stats64(dev, stats); 286 else 287 netdev_stats_to_stats64(stats, &dev->stats); 288 } 289 290 /* Called with an RCU read lock taken */ 291 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr, 292 struct net_device *dev) 293 { 294 struct net *net = dev_net(dev); 295 struct in_device *in_dev; 296 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr; 297 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr; 298 __be32 ret_addr; 299 300 switch (addr->sa_family) { 301 case AF_INET: 302 in_dev = in_dev_get(dev); 303 if (!in_dev) 304 return false; 305 306 ret_addr = inet_confirm_addr(net, in_dev, 0, 307 addr_in->sin_addr.s_addr, 308 RT_SCOPE_HOST); 309 in_dev_put(in_dev); 310 if (ret_addr) 311 return true; 312 313 break; 314 case AF_INET6: 315 if (IS_ENABLED(CONFIG_IPV6) && 316 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1)) 317 return true; 318 319 break; 320 } 321 return false; 322 } 323 324 /** 325 * Find the master net_device on top of the given net_device. 326 * @dev: base IPoIB net_device 327 * 328 * Returns the master net_device with a reference held, or the same net_device 329 * if no master exists. 330 */ 331 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev) 332 { 333 struct net_device *master; 334 335 rcu_read_lock(); 336 master = netdev_master_upper_dev_get_rcu(dev); 337 if (master) 338 dev_hold(master); 339 rcu_read_unlock(); 340 341 if (master) 342 return master; 343 344 dev_hold(dev); 345 return dev; 346 } 347 348 struct ipoib_walk_data { 349 const struct sockaddr *addr; 350 struct net_device *result; 351 }; 352 353 static int ipoib_upper_walk(struct net_device *upper, void *_data) 354 { 355 struct ipoib_walk_data *data = _data; 356 int ret = 0; 357 358 if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) { 359 dev_hold(upper); 360 data->result = upper; 361 ret = 1; 362 } 363 364 return ret; 365 } 366 367 /** 368 * Find a net_device matching the given address, which is an upper device of 369 * the given net_device. 370 * @addr: IP address to look for. 371 * @dev: base IPoIB net_device 372 * 373 * If found, returns the net_device with a reference held. Otherwise return 374 * NULL. 375 */ 376 static struct net_device *ipoib_get_net_dev_match_addr( 377 const struct sockaddr *addr, struct net_device *dev) 378 { 379 struct ipoib_walk_data data = { 380 .addr = addr, 381 }; 382 383 rcu_read_lock(); 384 if (ipoib_is_dev_match_addr_rcu(addr, dev)) { 385 dev_hold(dev); 386 data.result = dev; 387 goto out; 388 } 389 390 netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data); 391 out: 392 rcu_read_unlock(); 393 return data.result; 394 } 395 396 /* returns the number of IPoIB netdevs on top a given ipoib device matching a 397 * pkey_index and address, if one exists. 398 * 399 * @found_net_dev: contains a matching net_device if the return value >= 1, 400 * with a reference held. */ 401 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv, 402 const union ib_gid *gid, 403 u16 pkey_index, 404 const struct sockaddr *addr, 405 int nesting, 406 struct net_device **found_net_dev) 407 { 408 struct ipoib_dev_priv *child_priv; 409 struct net_device *net_dev = NULL; 410 int matches = 0; 411 412 if (priv->pkey_index == pkey_index && 413 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) { 414 if (!addr) { 415 net_dev = ipoib_get_master_net_dev(priv->dev); 416 } else { 417 /* Verify the net_device matches the IP address, as 418 * IPoIB child devices currently share a GID. */ 419 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev); 420 } 421 if (net_dev) { 422 if (!*found_net_dev) 423 *found_net_dev = net_dev; 424 else 425 dev_put(net_dev); 426 ++matches; 427 } 428 } 429 430 /* Check child interfaces */ 431 down_read_nested(&priv->vlan_rwsem, nesting); 432 list_for_each_entry(child_priv, &priv->child_intfs, list) { 433 matches += ipoib_match_gid_pkey_addr(child_priv, gid, 434 pkey_index, addr, 435 nesting + 1, 436 found_net_dev); 437 if (matches > 1) 438 break; 439 } 440 up_read(&priv->vlan_rwsem); 441 442 return matches; 443 } 444 445 /* Returns the number of matching net_devs found (between 0 and 2). Also 446 * return the matching net_device in the @net_dev parameter, holding a 447 * reference to the net_device, if the number of matches >= 1 */ 448 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port, 449 u16 pkey_index, 450 const union ib_gid *gid, 451 const struct sockaddr *addr, 452 struct net_device **net_dev) 453 { 454 struct ipoib_dev_priv *priv; 455 int matches = 0; 456 457 *net_dev = NULL; 458 459 list_for_each_entry(priv, dev_list, list) { 460 if (priv->port != port) 461 continue; 462 463 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index, 464 addr, 0, net_dev); 465 if (matches > 1) 466 break; 467 } 468 469 return matches; 470 } 471 472 static struct net_device *ipoib_get_net_dev_by_params( 473 struct ib_device *dev, u8 port, u16 pkey, 474 const union ib_gid *gid, const struct sockaddr *addr, 475 void *client_data) 476 { 477 struct net_device *net_dev; 478 struct list_head *dev_list = client_data; 479 u16 pkey_index; 480 int matches; 481 int ret; 482 483 if (!rdma_protocol_ib(dev, port)) 484 return NULL; 485 486 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index); 487 if (ret) 488 return NULL; 489 490 if (!dev_list) 491 return NULL; 492 493 /* See if we can find a unique device matching the L2 parameters */ 494 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, 495 gid, NULL, &net_dev); 496 497 switch (matches) { 498 case 0: 499 return NULL; 500 case 1: 501 return net_dev; 502 } 503 504 dev_put(net_dev); 505 506 /* Couldn't find a unique device with L2 parameters only. Use L3 507 * address to uniquely match the net device */ 508 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, 509 gid, addr, &net_dev); 510 switch (matches) { 511 case 0: 512 return NULL; 513 default: 514 dev_warn_ratelimited(&dev->dev, 515 "duplicate IP address detected\n"); 516 /* Fall through */ 517 case 1: 518 return net_dev; 519 } 520 } 521 522 int ipoib_set_mode(struct net_device *dev, const char *buf) 523 { 524 struct ipoib_dev_priv *priv = ipoib_priv(dev); 525 526 if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) && 527 !strcmp(buf, "connected\n")) || 528 (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) && 529 !strcmp(buf, "datagram\n"))) { 530 return 0; 531 } 532 533 /* flush paths if we switch modes so that connections are restarted */ 534 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 535 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 536 ipoib_warn(priv, "enabling connected mode " 537 "will cause multicast packet drops\n"); 538 netdev_update_features(dev); 539 dev_set_mtu(dev, ipoib_cm_max_mtu(dev)); 540 rtnl_unlock(); 541 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM; 542 543 ipoib_flush_paths(dev); 544 return (!rtnl_trylock()) ? -EBUSY : 0; 545 } 546 547 if (!strcmp(buf, "datagram\n")) { 548 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 549 netdev_update_features(dev); 550 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu)); 551 rtnl_unlock(); 552 ipoib_flush_paths(dev); 553 return (!rtnl_trylock()) ? -EBUSY : 0; 554 } 555 556 return -EINVAL; 557 } 558 559 struct ipoib_path *__path_find(struct net_device *dev, void *gid) 560 { 561 struct ipoib_dev_priv *priv = ipoib_priv(dev); 562 struct rb_node *n = priv->path_tree.rb_node; 563 struct ipoib_path *path; 564 int ret; 565 566 while (n) { 567 path = rb_entry(n, struct ipoib_path, rb_node); 568 569 ret = memcmp(gid, path->pathrec.dgid.raw, 570 sizeof (union ib_gid)); 571 572 if (ret < 0) 573 n = n->rb_left; 574 else if (ret > 0) 575 n = n->rb_right; 576 else 577 return path; 578 } 579 580 return NULL; 581 } 582 583 static int __path_add(struct net_device *dev, struct ipoib_path *path) 584 { 585 struct ipoib_dev_priv *priv = ipoib_priv(dev); 586 struct rb_node **n = &priv->path_tree.rb_node; 587 struct rb_node *pn = NULL; 588 struct ipoib_path *tpath; 589 int ret; 590 591 while (*n) { 592 pn = *n; 593 tpath = rb_entry(pn, struct ipoib_path, rb_node); 594 595 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw, 596 sizeof (union ib_gid)); 597 if (ret < 0) 598 n = &pn->rb_left; 599 else if (ret > 0) 600 n = &pn->rb_right; 601 else 602 return -EEXIST; 603 } 604 605 rb_link_node(&path->rb_node, pn, n); 606 rb_insert_color(&path->rb_node, &priv->path_tree); 607 608 list_add_tail(&path->list, &priv->path_list); 609 610 return 0; 611 } 612 613 static void path_free(struct net_device *dev, struct ipoib_path *path) 614 { 615 struct sk_buff *skb; 616 617 while ((skb = __skb_dequeue(&path->queue))) 618 dev_kfree_skb_irq(skb); 619 620 ipoib_dbg(ipoib_priv(dev), "path_free\n"); 621 622 /* remove all neigh connected to this path */ 623 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 624 625 if (path->ah) 626 ipoib_put_ah(path->ah); 627 628 kfree(path); 629 } 630 631 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 632 633 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev) 634 { 635 struct ipoib_path_iter *iter; 636 637 iter = kmalloc(sizeof *iter, GFP_KERNEL); 638 if (!iter) 639 return NULL; 640 641 iter->dev = dev; 642 memset(iter->path.pathrec.dgid.raw, 0, 16); 643 644 if (ipoib_path_iter_next(iter)) { 645 kfree(iter); 646 return NULL; 647 } 648 649 return iter; 650 } 651 652 int ipoib_path_iter_next(struct ipoib_path_iter *iter) 653 { 654 struct ipoib_dev_priv *priv = ipoib_priv(iter->dev); 655 struct rb_node *n; 656 struct ipoib_path *path; 657 int ret = 1; 658 659 spin_lock_irq(&priv->lock); 660 661 n = rb_first(&priv->path_tree); 662 663 while (n) { 664 path = rb_entry(n, struct ipoib_path, rb_node); 665 666 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw, 667 sizeof (union ib_gid)) < 0) { 668 iter->path = *path; 669 ret = 0; 670 break; 671 } 672 673 n = rb_next(n); 674 } 675 676 spin_unlock_irq(&priv->lock); 677 678 return ret; 679 } 680 681 void ipoib_path_iter_read(struct ipoib_path_iter *iter, 682 struct ipoib_path *path) 683 { 684 *path = iter->path; 685 } 686 687 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 688 689 void ipoib_mark_paths_invalid(struct net_device *dev) 690 { 691 struct ipoib_dev_priv *priv = ipoib_priv(dev); 692 struct ipoib_path *path, *tp; 693 694 spin_lock_irq(&priv->lock); 695 696 list_for_each_entry_safe(path, tp, &priv->path_list, list) { 697 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n", 698 be32_to_cpu(sa_path_get_dlid(&path->pathrec)), 699 path->pathrec.dgid.raw); 700 path->valid = 0; 701 } 702 703 spin_unlock_irq(&priv->lock); 704 } 705 706 static void push_pseudo_header(struct sk_buff *skb, const char *daddr) 707 { 708 struct ipoib_pseudo_header *phdr; 709 710 phdr = skb_push(skb, sizeof(*phdr)); 711 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN); 712 } 713 714 void ipoib_flush_paths(struct net_device *dev) 715 { 716 struct ipoib_dev_priv *priv = ipoib_priv(dev); 717 struct ipoib_path *path, *tp; 718 LIST_HEAD(remove_list); 719 unsigned long flags; 720 721 netif_tx_lock_bh(dev); 722 spin_lock_irqsave(&priv->lock, flags); 723 724 list_splice_init(&priv->path_list, &remove_list); 725 726 list_for_each_entry(path, &remove_list, list) 727 rb_erase(&path->rb_node, &priv->path_tree); 728 729 list_for_each_entry_safe(path, tp, &remove_list, list) { 730 if (path->query) 731 ib_sa_cancel_query(path->query_id, path->query); 732 spin_unlock_irqrestore(&priv->lock, flags); 733 netif_tx_unlock_bh(dev); 734 wait_for_completion(&path->done); 735 path_free(dev, path); 736 netif_tx_lock_bh(dev); 737 spin_lock_irqsave(&priv->lock, flags); 738 } 739 740 spin_unlock_irqrestore(&priv->lock, flags); 741 netif_tx_unlock_bh(dev); 742 } 743 744 static void path_rec_completion(int status, 745 struct sa_path_rec *pathrec, 746 void *path_ptr) 747 { 748 struct ipoib_path *path = path_ptr; 749 struct net_device *dev = path->dev; 750 struct ipoib_dev_priv *priv = ipoib_priv(dev); 751 struct ipoib_ah *ah = NULL; 752 struct ipoib_ah *old_ah = NULL; 753 struct ipoib_neigh *neigh, *tn; 754 struct sk_buff_head skqueue; 755 struct sk_buff *skb; 756 unsigned long flags; 757 758 if (!status) 759 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n", 760 be32_to_cpu(sa_path_get_dlid(pathrec)), 761 pathrec->dgid.raw); 762 else 763 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n", 764 status, path->pathrec.dgid.raw); 765 766 skb_queue_head_init(&skqueue); 767 768 if (!status) { 769 struct rdma_ah_attr av; 770 771 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av)) 772 ah = ipoib_create_ah(dev, priv->pd, &av); 773 } 774 775 spin_lock_irqsave(&priv->lock, flags); 776 777 if (!IS_ERR_OR_NULL(ah)) { 778 path->pathrec = *pathrec; 779 780 old_ah = path->ah; 781 path->ah = ah; 782 783 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n", 784 ah, be32_to_cpu(sa_path_get_dlid(pathrec)), 785 pathrec->sl); 786 787 while ((skb = __skb_dequeue(&path->queue))) 788 __skb_queue_tail(&skqueue, skb); 789 790 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { 791 if (neigh->ah) { 792 WARN_ON(neigh->ah != old_ah); 793 /* 794 * Dropping the ah reference inside 795 * priv->lock is safe here, because we 796 * will hold one more reference from 797 * the original value of path->ah (ie 798 * old_ah). 799 */ 800 ipoib_put_ah(neigh->ah); 801 } 802 kref_get(&path->ah->ref); 803 neigh->ah = path->ah; 804 805 if (ipoib_cm_enabled(dev, neigh->daddr)) { 806 if (!ipoib_cm_get(neigh)) 807 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, 808 path, 809 neigh)); 810 if (!ipoib_cm_get(neigh)) { 811 ipoib_neigh_free(neigh); 812 continue; 813 } 814 } 815 816 while ((skb = __skb_dequeue(&neigh->queue))) 817 __skb_queue_tail(&skqueue, skb); 818 } 819 path->valid = 1; 820 } 821 822 path->query = NULL; 823 complete(&path->done); 824 825 spin_unlock_irqrestore(&priv->lock, flags); 826 827 if (IS_ERR_OR_NULL(ah)) 828 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 829 830 if (old_ah) 831 ipoib_put_ah(old_ah); 832 833 while ((skb = __skb_dequeue(&skqueue))) { 834 int ret; 835 skb->dev = dev; 836 ret = dev_queue_xmit(skb); 837 if (ret) 838 ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n", 839 __func__, ret); 840 } 841 } 842 843 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid) 844 { 845 struct ipoib_dev_priv *priv = ipoib_priv(dev); 846 struct ipoib_path *path; 847 848 if (!priv->broadcast) 849 return NULL; 850 851 path = kzalloc(sizeof *path, GFP_ATOMIC); 852 if (!path) 853 return NULL; 854 855 path->dev = dev; 856 857 skb_queue_head_init(&path->queue); 858 859 INIT_LIST_HEAD(&path->neigh_list); 860 861 if (rdma_cap_opa_ah(priv->ca, priv->port)) 862 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA; 863 else 864 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB; 865 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid)); 866 path->pathrec.sgid = priv->local_gid; 867 path->pathrec.pkey = cpu_to_be16(priv->pkey); 868 path->pathrec.numb_path = 1; 869 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class; 870 871 return path; 872 } 873 874 static int path_rec_start(struct net_device *dev, 875 struct ipoib_path *path) 876 { 877 struct ipoib_dev_priv *priv = ipoib_priv(dev); 878 879 ipoib_dbg(priv, "Start path record lookup for %pI6\n", 880 path->pathrec.dgid.raw); 881 882 init_completion(&path->done); 883 884 path->query_id = 885 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port, 886 &path->pathrec, 887 IB_SA_PATH_REC_DGID | 888 IB_SA_PATH_REC_SGID | 889 IB_SA_PATH_REC_NUMB_PATH | 890 IB_SA_PATH_REC_TRAFFIC_CLASS | 891 IB_SA_PATH_REC_PKEY, 892 1000, GFP_ATOMIC, 893 path_rec_completion, 894 path, &path->query); 895 if (path->query_id < 0) { 896 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id); 897 path->query = NULL; 898 complete(&path->done); 899 return path->query_id; 900 } 901 902 return 0; 903 } 904 905 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr, 906 struct net_device *dev) 907 { 908 struct ipoib_dev_priv *priv = ipoib_priv(dev); 909 struct rdma_netdev *rn = netdev_priv(dev); 910 struct ipoib_path *path; 911 struct ipoib_neigh *neigh; 912 unsigned long flags; 913 914 spin_lock_irqsave(&priv->lock, flags); 915 neigh = ipoib_neigh_alloc(daddr, dev); 916 if (!neigh) { 917 spin_unlock_irqrestore(&priv->lock, flags); 918 ++dev->stats.tx_dropped; 919 dev_kfree_skb_any(skb); 920 return NULL; 921 } 922 923 /* To avoid race condition, make sure that the 924 * neigh will be added only once. 925 */ 926 if (unlikely(!list_empty(&neigh->list))) { 927 spin_unlock_irqrestore(&priv->lock, flags); 928 return neigh; 929 } 930 931 path = __path_find(dev, daddr + 4); 932 if (!path) { 933 path = path_rec_create(dev, daddr + 4); 934 if (!path) 935 goto err_path; 936 937 __path_add(dev, path); 938 } 939 940 list_add_tail(&neigh->list, &path->neigh_list); 941 942 if (path->ah) { 943 kref_get(&path->ah->ref); 944 neigh->ah = path->ah; 945 946 if (ipoib_cm_enabled(dev, neigh->daddr)) { 947 if (!ipoib_cm_get(neigh)) 948 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh)); 949 if (!ipoib_cm_get(neigh)) { 950 ipoib_neigh_free(neigh); 951 goto err_drop; 952 } 953 if (skb_queue_len(&neigh->queue) < 954 IPOIB_MAX_PATH_REC_QUEUE) { 955 push_pseudo_header(skb, neigh->daddr); 956 __skb_queue_tail(&neigh->queue, skb); 957 } else { 958 ipoib_warn(priv, "queue length limit %d. Packet drop.\n", 959 skb_queue_len(&neigh->queue)); 960 goto err_drop; 961 } 962 } else { 963 spin_unlock_irqrestore(&priv->lock, flags); 964 path->ah->last_send = rn->send(dev, skb, path->ah->ah, 965 IPOIB_QPN(daddr)); 966 ipoib_neigh_put(neigh); 967 return NULL; 968 } 969 } else { 970 neigh->ah = NULL; 971 972 if (!path->query && path_rec_start(dev, path)) 973 goto err_path; 974 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 975 push_pseudo_header(skb, neigh->daddr); 976 __skb_queue_tail(&neigh->queue, skb); 977 } else { 978 goto err_drop; 979 } 980 } 981 982 spin_unlock_irqrestore(&priv->lock, flags); 983 ipoib_neigh_put(neigh); 984 return NULL; 985 986 err_path: 987 ipoib_neigh_free(neigh); 988 err_drop: 989 ++dev->stats.tx_dropped; 990 dev_kfree_skb_any(skb); 991 992 spin_unlock_irqrestore(&priv->lock, flags); 993 ipoib_neigh_put(neigh); 994 995 return NULL; 996 } 997 998 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, 999 struct ipoib_pseudo_header *phdr) 1000 { 1001 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1002 struct rdma_netdev *rn = netdev_priv(dev); 1003 struct ipoib_path *path; 1004 unsigned long flags; 1005 1006 spin_lock_irqsave(&priv->lock, flags); 1007 1008 path = __path_find(dev, phdr->hwaddr + 4); 1009 if (!path || !path->valid) { 1010 int new_path = 0; 1011 1012 if (!path) { 1013 path = path_rec_create(dev, phdr->hwaddr + 4); 1014 new_path = 1; 1015 } 1016 if (path) { 1017 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1018 push_pseudo_header(skb, phdr->hwaddr); 1019 __skb_queue_tail(&path->queue, skb); 1020 } else { 1021 ++dev->stats.tx_dropped; 1022 dev_kfree_skb_any(skb); 1023 } 1024 1025 if (!path->query && path_rec_start(dev, path)) { 1026 spin_unlock_irqrestore(&priv->lock, flags); 1027 if (new_path) 1028 path_free(dev, path); 1029 return; 1030 } else 1031 __path_add(dev, path); 1032 } else { 1033 ++dev->stats.tx_dropped; 1034 dev_kfree_skb_any(skb); 1035 } 1036 1037 spin_unlock_irqrestore(&priv->lock, flags); 1038 return; 1039 } 1040 1041 if (path->ah) { 1042 ipoib_dbg(priv, "Send unicast ARP to %08x\n", 1043 be32_to_cpu(sa_path_get_dlid(&path->pathrec))); 1044 1045 spin_unlock_irqrestore(&priv->lock, flags); 1046 path->ah->last_send = rn->send(dev, skb, path->ah->ah, 1047 IPOIB_QPN(phdr->hwaddr)); 1048 return; 1049 } else if ((path->query || !path_rec_start(dev, path)) && 1050 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1051 push_pseudo_header(skb, phdr->hwaddr); 1052 __skb_queue_tail(&path->queue, skb); 1053 } else { 1054 ++dev->stats.tx_dropped; 1055 dev_kfree_skb_any(skb); 1056 } 1057 1058 spin_unlock_irqrestore(&priv->lock, flags); 1059 } 1060 1061 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 1062 { 1063 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1064 struct rdma_netdev *rn = netdev_priv(dev); 1065 struct ipoib_neigh *neigh; 1066 struct ipoib_pseudo_header *phdr; 1067 struct ipoib_header *header; 1068 unsigned long flags; 1069 1070 phdr = (struct ipoib_pseudo_header *) skb->data; 1071 skb_pull(skb, sizeof(*phdr)); 1072 header = (struct ipoib_header *) skb->data; 1073 1074 if (unlikely(phdr->hwaddr[4] == 0xff)) { 1075 /* multicast, arrange "if" according to probability */ 1076 if ((header->proto != htons(ETH_P_IP)) && 1077 (header->proto != htons(ETH_P_IPV6)) && 1078 (header->proto != htons(ETH_P_ARP)) && 1079 (header->proto != htons(ETH_P_RARP)) && 1080 (header->proto != htons(ETH_P_TIPC))) { 1081 /* ethertype not supported by IPoIB */ 1082 ++dev->stats.tx_dropped; 1083 dev_kfree_skb_any(skb); 1084 return NETDEV_TX_OK; 1085 } 1086 /* Add in the P_Key for multicast*/ 1087 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff; 1088 phdr->hwaddr[9] = priv->pkey & 0xff; 1089 1090 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1091 if (likely(neigh)) 1092 goto send_using_neigh; 1093 ipoib_mcast_send(dev, phdr->hwaddr, skb); 1094 return NETDEV_TX_OK; 1095 } 1096 1097 /* unicast, arrange "switch" according to probability */ 1098 switch (header->proto) { 1099 case htons(ETH_P_IP): 1100 case htons(ETH_P_IPV6): 1101 case htons(ETH_P_TIPC): 1102 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1103 if (unlikely(!neigh)) { 1104 neigh = neigh_add_path(skb, phdr->hwaddr, dev); 1105 if (likely(!neigh)) 1106 return NETDEV_TX_OK; 1107 } 1108 break; 1109 case htons(ETH_P_ARP): 1110 case htons(ETH_P_RARP): 1111 /* for unicast ARP and RARP should always perform path find */ 1112 unicast_arp_send(skb, dev, phdr); 1113 return NETDEV_TX_OK; 1114 default: 1115 /* ethertype not supported by IPoIB */ 1116 ++dev->stats.tx_dropped; 1117 dev_kfree_skb_any(skb); 1118 return NETDEV_TX_OK; 1119 } 1120 1121 send_using_neigh: 1122 /* note we now hold a ref to neigh */ 1123 if (ipoib_cm_get(neigh)) { 1124 if (ipoib_cm_up(neigh)) { 1125 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); 1126 goto unref; 1127 } 1128 } else if (neigh->ah) { 1129 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah, 1130 IPOIB_QPN(phdr->hwaddr)); 1131 goto unref; 1132 } 1133 1134 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1135 push_pseudo_header(skb, phdr->hwaddr); 1136 spin_lock_irqsave(&priv->lock, flags); 1137 __skb_queue_tail(&neigh->queue, skb); 1138 spin_unlock_irqrestore(&priv->lock, flags); 1139 } else { 1140 ++dev->stats.tx_dropped; 1141 dev_kfree_skb_any(skb); 1142 } 1143 1144 unref: 1145 ipoib_neigh_put(neigh); 1146 1147 return NETDEV_TX_OK; 1148 } 1149 1150 static void ipoib_timeout(struct net_device *dev) 1151 { 1152 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1153 1154 ipoib_warn(priv, "transmit timeout: latency %d msecs\n", 1155 jiffies_to_msecs(jiffies - dev_trans_start(dev))); 1156 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n", 1157 netif_queue_stopped(dev), 1158 priv->tx_head, priv->tx_tail); 1159 /* XXX reset QP, etc. */ 1160 } 1161 1162 static int ipoib_hard_header(struct sk_buff *skb, 1163 struct net_device *dev, 1164 unsigned short type, 1165 const void *daddr, const void *saddr, unsigned len) 1166 { 1167 struct ipoib_header *header; 1168 1169 header = skb_push(skb, sizeof *header); 1170 1171 header->proto = htons(type); 1172 header->reserved = 0; 1173 1174 /* 1175 * we don't rely on dst_entry structure, always stuff the 1176 * destination address into skb hard header so we can figure out where 1177 * to send the packet later. 1178 */ 1179 push_pseudo_header(skb, daddr); 1180 1181 return IPOIB_HARD_LEN; 1182 } 1183 1184 static void ipoib_set_mcast_list(struct net_device *dev) 1185 { 1186 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1187 1188 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 1189 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); 1190 return; 1191 } 1192 1193 queue_work(priv->wq, &priv->restart_task); 1194 } 1195 1196 static int ipoib_get_iflink(const struct net_device *dev) 1197 { 1198 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1199 1200 /* parent interface */ 1201 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1202 return dev->ifindex; 1203 1204 /* child/vlan interface */ 1205 return priv->parent->ifindex; 1206 } 1207 1208 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr) 1209 { 1210 /* 1211 * Use only the address parts that contributes to spreading 1212 * The subnet prefix is not used as one can not connect to 1213 * same remote port (GUID) using the same remote QPN via two 1214 * different subnets. 1215 */ 1216 /* qpn octets[1:4) & port GUID octets[12:20) */ 1217 u32 *d32 = (u32 *) daddr; 1218 u32 hv; 1219 1220 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0); 1221 return hv & htbl->mask; 1222 } 1223 1224 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr) 1225 { 1226 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1227 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1228 struct ipoib_neigh_hash *htbl; 1229 struct ipoib_neigh *neigh = NULL; 1230 u32 hash_val; 1231 1232 rcu_read_lock_bh(); 1233 1234 htbl = rcu_dereference_bh(ntbl->htbl); 1235 1236 if (!htbl) 1237 goto out_unlock; 1238 1239 hash_val = ipoib_addr_hash(htbl, daddr); 1240 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]); 1241 neigh != NULL; 1242 neigh = rcu_dereference_bh(neigh->hnext)) { 1243 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1244 /* found, take one ref on behalf of the caller */ 1245 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1246 /* deleted */ 1247 neigh = NULL; 1248 goto out_unlock; 1249 } 1250 1251 if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)) 1252 neigh->alive = jiffies; 1253 goto out_unlock; 1254 } 1255 } 1256 1257 out_unlock: 1258 rcu_read_unlock_bh(); 1259 return neigh; 1260 } 1261 1262 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv) 1263 { 1264 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1265 struct ipoib_neigh_hash *htbl; 1266 unsigned long neigh_obsolete; 1267 unsigned long dt; 1268 unsigned long flags; 1269 int i; 1270 LIST_HEAD(remove_list); 1271 1272 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 1273 return; 1274 1275 spin_lock_irqsave(&priv->lock, flags); 1276 1277 htbl = rcu_dereference_protected(ntbl->htbl, 1278 lockdep_is_held(&priv->lock)); 1279 1280 if (!htbl) 1281 goto out_unlock; 1282 1283 /* neigh is obsolete if it was idle for two GC periods */ 1284 dt = 2 * arp_tbl.gc_interval; 1285 neigh_obsolete = jiffies - dt; 1286 /* handle possible race condition */ 1287 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 1288 goto out_unlock; 1289 1290 for (i = 0; i < htbl->size; i++) { 1291 struct ipoib_neigh *neigh; 1292 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1293 1294 while ((neigh = rcu_dereference_protected(*np, 1295 lockdep_is_held(&priv->lock))) != NULL) { 1296 /* was the neigh idle for two GC periods */ 1297 if (time_after(neigh_obsolete, neigh->alive)) { 1298 1299 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list); 1300 1301 rcu_assign_pointer(*np, 1302 rcu_dereference_protected(neigh->hnext, 1303 lockdep_is_held(&priv->lock))); 1304 /* remove from path/mc list */ 1305 list_del_init(&neigh->list); 1306 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1307 } else { 1308 np = &neigh->hnext; 1309 } 1310 1311 } 1312 } 1313 1314 out_unlock: 1315 spin_unlock_irqrestore(&priv->lock, flags); 1316 ipoib_mcast_remove_list(&remove_list); 1317 } 1318 1319 static void ipoib_reap_neigh(struct work_struct *work) 1320 { 1321 struct ipoib_dev_priv *priv = 1322 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work); 1323 1324 __ipoib_reap_neigh(priv); 1325 1326 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 1327 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1328 arp_tbl.gc_interval); 1329 } 1330 1331 1332 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr, 1333 struct net_device *dev) 1334 { 1335 struct ipoib_neigh *neigh; 1336 1337 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC); 1338 if (!neigh) 1339 return NULL; 1340 1341 neigh->dev = dev; 1342 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr)); 1343 skb_queue_head_init(&neigh->queue); 1344 INIT_LIST_HEAD(&neigh->list); 1345 ipoib_cm_set(neigh, NULL); 1346 /* one ref on behalf of the caller */ 1347 atomic_set(&neigh->refcnt, 1); 1348 1349 return neigh; 1350 } 1351 1352 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr, 1353 struct net_device *dev) 1354 { 1355 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1356 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1357 struct ipoib_neigh_hash *htbl; 1358 struct ipoib_neigh *neigh; 1359 u32 hash_val; 1360 1361 htbl = rcu_dereference_protected(ntbl->htbl, 1362 lockdep_is_held(&priv->lock)); 1363 if (!htbl) { 1364 neigh = NULL; 1365 goto out_unlock; 1366 } 1367 1368 /* need to add a new neigh, but maybe some other thread succeeded? 1369 * recalc hash, maybe hash resize took place so we do a search 1370 */ 1371 hash_val = ipoib_addr_hash(htbl, daddr); 1372 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val], 1373 lockdep_is_held(&priv->lock)); 1374 neigh != NULL; 1375 neigh = rcu_dereference_protected(neigh->hnext, 1376 lockdep_is_held(&priv->lock))) { 1377 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1378 /* found, take one ref on behalf of the caller */ 1379 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1380 /* deleted */ 1381 neigh = NULL; 1382 break; 1383 } 1384 neigh->alive = jiffies; 1385 goto out_unlock; 1386 } 1387 } 1388 1389 neigh = ipoib_neigh_ctor(daddr, dev); 1390 if (!neigh) 1391 goto out_unlock; 1392 1393 /* one ref on behalf of the hash table */ 1394 atomic_inc(&neigh->refcnt); 1395 neigh->alive = jiffies; 1396 /* put in hash */ 1397 rcu_assign_pointer(neigh->hnext, 1398 rcu_dereference_protected(htbl->buckets[hash_val], 1399 lockdep_is_held(&priv->lock))); 1400 rcu_assign_pointer(htbl->buckets[hash_val], neigh); 1401 atomic_inc(&ntbl->entries); 1402 1403 out_unlock: 1404 1405 return neigh; 1406 } 1407 1408 void ipoib_neigh_dtor(struct ipoib_neigh *neigh) 1409 { 1410 /* neigh reference count was dropprd to zero */ 1411 struct net_device *dev = neigh->dev; 1412 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1413 struct sk_buff *skb; 1414 if (neigh->ah) 1415 ipoib_put_ah(neigh->ah); 1416 while ((skb = __skb_dequeue(&neigh->queue))) { 1417 ++dev->stats.tx_dropped; 1418 dev_kfree_skb_any(skb); 1419 } 1420 if (ipoib_cm_get(neigh)) 1421 ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); 1422 ipoib_dbg(ipoib_priv(dev), 1423 "neigh free for %06x %pI6\n", 1424 IPOIB_QPN(neigh->daddr), 1425 neigh->daddr + 4); 1426 kfree(neigh); 1427 if (atomic_dec_and_test(&priv->ntbl.entries)) { 1428 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags)) 1429 complete(&priv->ntbl.flushed); 1430 } 1431 } 1432 1433 static void ipoib_neigh_reclaim(struct rcu_head *rp) 1434 { 1435 /* Called as a result of removal from hash table */ 1436 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu); 1437 /* note TX context may hold another ref */ 1438 ipoib_neigh_put(neigh); 1439 } 1440 1441 void ipoib_neigh_free(struct ipoib_neigh *neigh) 1442 { 1443 struct net_device *dev = neigh->dev; 1444 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1445 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1446 struct ipoib_neigh_hash *htbl; 1447 struct ipoib_neigh __rcu **np; 1448 struct ipoib_neigh *n; 1449 u32 hash_val; 1450 1451 htbl = rcu_dereference_protected(ntbl->htbl, 1452 lockdep_is_held(&priv->lock)); 1453 if (!htbl) 1454 return; 1455 1456 hash_val = ipoib_addr_hash(htbl, neigh->daddr); 1457 np = &htbl->buckets[hash_val]; 1458 for (n = rcu_dereference_protected(*np, 1459 lockdep_is_held(&priv->lock)); 1460 n != NULL; 1461 n = rcu_dereference_protected(*np, 1462 lockdep_is_held(&priv->lock))) { 1463 if (n == neigh) { 1464 /* found */ 1465 rcu_assign_pointer(*np, 1466 rcu_dereference_protected(neigh->hnext, 1467 lockdep_is_held(&priv->lock))); 1468 /* remove from parent list */ 1469 list_del_init(&neigh->list); 1470 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1471 return; 1472 } else { 1473 np = &n->hnext; 1474 } 1475 } 1476 } 1477 1478 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv) 1479 { 1480 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1481 struct ipoib_neigh_hash *htbl; 1482 struct ipoib_neigh __rcu **buckets; 1483 u32 size; 1484 1485 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1486 ntbl->htbl = NULL; 1487 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL); 1488 if (!htbl) 1489 return -ENOMEM; 1490 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1491 size = roundup_pow_of_two(arp_tbl.gc_thresh3); 1492 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL); 1493 if (!buckets) { 1494 kfree(htbl); 1495 return -ENOMEM; 1496 } 1497 htbl->size = size; 1498 htbl->mask = (size - 1); 1499 htbl->buckets = buckets; 1500 RCU_INIT_POINTER(ntbl->htbl, htbl); 1501 htbl->ntbl = ntbl; 1502 atomic_set(&ntbl->entries, 0); 1503 1504 /* start garbage collection */ 1505 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1506 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1507 arp_tbl.gc_interval); 1508 1509 return 0; 1510 } 1511 1512 static void neigh_hash_free_rcu(struct rcu_head *head) 1513 { 1514 struct ipoib_neigh_hash *htbl = container_of(head, 1515 struct ipoib_neigh_hash, 1516 rcu); 1517 struct ipoib_neigh __rcu **buckets = htbl->buckets; 1518 struct ipoib_neigh_table *ntbl = htbl->ntbl; 1519 1520 kfree(buckets); 1521 kfree(htbl); 1522 complete(&ntbl->deleted); 1523 } 1524 1525 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid) 1526 { 1527 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1528 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1529 struct ipoib_neigh_hash *htbl; 1530 unsigned long flags; 1531 int i; 1532 1533 /* remove all neigh connected to a given path or mcast */ 1534 spin_lock_irqsave(&priv->lock, flags); 1535 1536 htbl = rcu_dereference_protected(ntbl->htbl, 1537 lockdep_is_held(&priv->lock)); 1538 1539 if (!htbl) 1540 goto out_unlock; 1541 1542 for (i = 0; i < htbl->size; i++) { 1543 struct ipoib_neigh *neigh; 1544 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1545 1546 while ((neigh = rcu_dereference_protected(*np, 1547 lockdep_is_held(&priv->lock))) != NULL) { 1548 /* delete neighs belong to this parent */ 1549 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) { 1550 rcu_assign_pointer(*np, 1551 rcu_dereference_protected(neigh->hnext, 1552 lockdep_is_held(&priv->lock))); 1553 /* remove from parent list */ 1554 list_del_init(&neigh->list); 1555 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1556 } else { 1557 np = &neigh->hnext; 1558 } 1559 1560 } 1561 } 1562 out_unlock: 1563 spin_unlock_irqrestore(&priv->lock, flags); 1564 } 1565 1566 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv) 1567 { 1568 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1569 struct ipoib_neigh_hash *htbl; 1570 unsigned long flags; 1571 int i, wait_flushed = 0; 1572 1573 init_completion(&priv->ntbl.flushed); 1574 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1575 1576 spin_lock_irqsave(&priv->lock, flags); 1577 1578 htbl = rcu_dereference_protected(ntbl->htbl, 1579 lockdep_is_held(&priv->lock)); 1580 if (!htbl) 1581 goto out_unlock; 1582 1583 wait_flushed = atomic_read(&priv->ntbl.entries); 1584 if (!wait_flushed) 1585 goto free_htbl; 1586 1587 for (i = 0; i < htbl->size; i++) { 1588 struct ipoib_neigh *neigh; 1589 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1590 1591 while ((neigh = rcu_dereference_protected(*np, 1592 lockdep_is_held(&priv->lock))) != NULL) { 1593 rcu_assign_pointer(*np, 1594 rcu_dereference_protected(neigh->hnext, 1595 lockdep_is_held(&priv->lock))); 1596 /* remove from path/mc list */ 1597 list_del_init(&neigh->list); 1598 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1599 } 1600 } 1601 1602 free_htbl: 1603 rcu_assign_pointer(ntbl->htbl, NULL); 1604 call_rcu(&htbl->rcu, neigh_hash_free_rcu); 1605 1606 out_unlock: 1607 spin_unlock_irqrestore(&priv->lock, flags); 1608 if (wait_flushed) 1609 wait_for_completion(&priv->ntbl.flushed); 1610 } 1611 1612 static void ipoib_neigh_hash_uninit(struct net_device *dev) 1613 { 1614 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1615 int stopped; 1616 1617 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n"); 1618 init_completion(&priv->ntbl.deleted); 1619 1620 /* Stop GC if called at init fail need to cancel work */ 1621 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1622 if (!stopped) 1623 cancel_delayed_work(&priv->neigh_reap_task); 1624 1625 ipoib_flush_neighs(priv); 1626 1627 wait_for_completion(&priv->ntbl.deleted); 1628 } 1629 1630 static void ipoib_napi_add(struct net_device *dev) 1631 { 1632 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1633 1634 netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC); 1635 netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE); 1636 } 1637 1638 static void ipoib_napi_del(struct net_device *dev) 1639 { 1640 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1641 1642 netif_napi_del(&priv->recv_napi); 1643 netif_napi_del(&priv->send_napi); 1644 } 1645 1646 static void ipoib_dev_uninit_default(struct net_device *dev) 1647 { 1648 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1649 1650 ipoib_transport_dev_cleanup(dev); 1651 1652 ipoib_napi_del(dev); 1653 1654 ipoib_cm_dev_cleanup(dev); 1655 1656 kfree(priv->rx_ring); 1657 vfree(priv->tx_ring); 1658 1659 priv->rx_ring = NULL; 1660 priv->tx_ring = NULL; 1661 } 1662 1663 static int ipoib_dev_init_default(struct net_device *dev) 1664 { 1665 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1666 1667 ipoib_napi_add(dev); 1668 1669 /* Allocate RX/TX "rings" to hold queued skbs */ 1670 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring, 1671 GFP_KERNEL); 1672 if (!priv->rx_ring) 1673 goto out; 1674 1675 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring); 1676 if (!priv->tx_ring) { 1677 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n", 1678 priv->ca->name, ipoib_sendq_size); 1679 goto out_rx_ring_cleanup; 1680 } 1681 1682 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */ 1683 1684 if (ipoib_transport_dev_init(dev, priv->ca)) { 1685 pr_warn("%s: ipoib_transport_dev_init failed\n", 1686 priv->ca->name); 1687 goto out_tx_ring_cleanup; 1688 } 1689 1690 /* after qp created set dev address */ 1691 priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff; 1692 priv->dev->dev_addr[2] = (priv->qp->qp_num >> 8) & 0xff; 1693 priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff; 1694 1695 return 0; 1696 1697 out_tx_ring_cleanup: 1698 vfree(priv->tx_ring); 1699 1700 out_rx_ring_cleanup: 1701 kfree(priv->rx_ring); 1702 1703 out: 1704 ipoib_napi_del(dev); 1705 return -ENOMEM; 1706 } 1707 1708 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr, 1709 int cmd) 1710 { 1711 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1712 1713 if (!priv->rn_ops->ndo_do_ioctl) 1714 return -EOPNOTSUPP; 1715 1716 return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd); 1717 } 1718 1719 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 1720 { 1721 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1722 int ret = -ENOMEM; 1723 1724 priv->ca = ca; 1725 priv->port = port; 1726 priv->qp = NULL; 1727 1728 /* 1729 * the various IPoIB tasks assume they will never race against 1730 * themselves, so always use a single thread workqueue 1731 */ 1732 priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM); 1733 if (!priv->wq) { 1734 pr_warn("%s: failed to allocate device WQ\n", dev->name); 1735 goto out; 1736 } 1737 1738 /* create pd, which used both for control and datapath*/ 1739 priv->pd = ib_alloc_pd(priv->ca, 0); 1740 if (IS_ERR(priv->pd)) { 1741 pr_warn("%s: failed to allocate PD\n", ca->name); 1742 goto clean_wq; 1743 } 1744 1745 ret = priv->rn_ops->ndo_init(dev); 1746 if (ret) { 1747 pr_warn("%s failed to init HW resource\n", dev->name); 1748 goto out_free_pd; 1749 } 1750 1751 if (ipoib_neigh_hash_init(priv) < 0) { 1752 pr_warn("%s failed to init neigh hash\n", dev->name); 1753 goto out_dev_uninit; 1754 } 1755 1756 if (dev->flags & IFF_UP) { 1757 if (ipoib_ib_dev_open(dev)) { 1758 pr_warn("%s failed to open device\n", dev->name); 1759 ret = -ENODEV; 1760 goto out_dev_uninit; 1761 } 1762 } 1763 1764 return 0; 1765 1766 out_dev_uninit: 1767 ipoib_ib_dev_cleanup(dev); 1768 1769 out_free_pd: 1770 if (priv->pd) { 1771 ib_dealloc_pd(priv->pd); 1772 priv->pd = NULL; 1773 } 1774 1775 clean_wq: 1776 if (priv->wq) { 1777 destroy_workqueue(priv->wq); 1778 priv->wq = NULL; 1779 } 1780 1781 out: 1782 return ret; 1783 } 1784 1785 void ipoib_dev_cleanup(struct net_device *dev) 1786 { 1787 struct ipoib_dev_priv *priv = ipoib_priv(dev), *cpriv, *tcpriv; 1788 LIST_HEAD(head); 1789 1790 ASSERT_RTNL(); 1791 1792 /* Delete any child interfaces first */ 1793 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) { 1794 /* Stop GC on child */ 1795 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags); 1796 cancel_delayed_work(&cpriv->neigh_reap_task); 1797 unregister_netdevice_queue(cpriv->dev, &head); 1798 } 1799 unregister_netdevice_many(&head); 1800 1801 ipoib_neigh_hash_uninit(dev); 1802 1803 ipoib_ib_dev_cleanup(dev); 1804 1805 /* no more works over the priv->wq */ 1806 if (priv->wq) { 1807 flush_workqueue(priv->wq); 1808 destroy_workqueue(priv->wq); 1809 priv->wq = NULL; 1810 } 1811 } 1812 1813 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state) 1814 { 1815 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1816 1817 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state); 1818 } 1819 1820 static int ipoib_get_vf_config(struct net_device *dev, int vf, 1821 struct ifla_vf_info *ivf) 1822 { 1823 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1824 int err; 1825 1826 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf); 1827 if (err) 1828 return err; 1829 1830 ivf->vf = vf; 1831 1832 return 0; 1833 } 1834 1835 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type) 1836 { 1837 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1838 1839 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID) 1840 return -EINVAL; 1841 1842 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type); 1843 } 1844 1845 static int ipoib_get_vf_stats(struct net_device *dev, int vf, 1846 struct ifla_vf_stats *vf_stats) 1847 { 1848 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1849 1850 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats); 1851 } 1852 1853 static const struct header_ops ipoib_header_ops = { 1854 .create = ipoib_hard_header, 1855 }; 1856 1857 static const struct net_device_ops ipoib_netdev_ops_pf = { 1858 .ndo_uninit = ipoib_uninit, 1859 .ndo_open = ipoib_open, 1860 .ndo_stop = ipoib_stop, 1861 .ndo_change_mtu = ipoib_change_mtu, 1862 .ndo_fix_features = ipoib_fix_features, 1863 .ndo_start_xmit = ipoib_start_xmit, 1864 .ndo_tx_timeout = ipoib_timeout, 1865 .ndo_set_rx_mode = ipoib_set_mcast_list, 1866 .ndo_get_iflink = ipoib_get_iflink, 1867 .ndo_set_vf_link_state = ipoib_set_vf_link_state, 1868 .ndo_get_vf_config = ipoib_get_vf_config, 1869 .ndo_get_vf_stats = ipoib_get_vf_stats, 1870 .ndo_set_vf_guid = ipoib_set_vf_guid, 1871 .ndo_set_mac_address = ipoib_set_mac, 1872 .ndo_get_stats64 = ipoib_get_stats, 1873 .ndo_do_ioctl = ipoib_ioctl, 1874 }; 1875 1876 static const struct net_device_ops ipoib_netdev_ops_vf = { 1877 .ndo_uninit = ipoib_uninit, 1878 .ndo_open = ipoib_open, 1879 .ndo_stop = ipoib_stop, 1880 .ndo_change_mtu = ipoib_change_mtu, 1881 .ndo_fix_features = ipoib_fix_features, 1882 .ndo_start_xmit = ipoib_start_xmit, 1883 .ndo_tx_timeout = ipoib_timeout, 1884 .ndo_set_rx_mode = ipoib_set_mcast_list, 1885 .ndo_get_iflink = ipoib_get_iflink, 1886 .ndo_get_stats64 = ipoib_get_stats, 1887 .ndo_do_ioctl = ipoib_ioctl, 1888 }; 1889 1890 void ipoib_setup_common(struct net_device *dev) 1891 { 1892 dev->header_ops = &ipoib_header_ops; 1893 1894 ipoib_set_ethtool_ops(dev); 1895 1896 dev->watchdog_timeo = HZ; 1897 1898 dev->flags |= IFF_BROADCAST | IFF_MULTICAST; 1899 1900 dev->hard_header_len = IPOIB_HARD_LEN; 1901 dev->addr_len = INFINIBAND_ALEN; 1902 dev->type = ARPHRD_INFINIBAND; 1903 dev->tx_queue_len = ipoib_sendq_size * 2; 1904 dev->features = (NETIF_F_VLAN_CHALLENGED | 1905 NETIF_F_HIGHDMA); 1906 netif_keep_dst(dev); 1907 1908 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); 1909 } 1910 1911 static void ipoib_build_priv(struct net_device *dev) 1912 { 1913 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1914 1915 priv->dev = dev; 1916 spin_lock_init(&priv->lock); 1917 init_rwsem(&priv->vlan_rwsem); 1918 mutex_init(&priv->mcast_mutex); 1919 mutex_init(&priv->sysfs_mutex); 1920 1921 INIT_LIST_HEAD(&priv->path_list); 1922 INIT_LIST_HEAD(&priv->child_intfs); 1923 INIT_LIST_HEAD(&priv->dead_ahs); 1924 INIT_LIST_HEAD(&priv->multicast_list); 1925 1926 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); 1927 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task); 1928 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light); 1929 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal); 1930 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy); 1931 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); 1932 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); 1933 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh); 1934 } 1935 1936 static const struct net_device_ops ipoib_netdev_default_pf = { 1937 .ndo_init = ipoib_dev_init_default, 1938 .ndo_uninit = ipoib_dev_uninit_default, 1939 .ndo_open = ipoib_ib_dev_open_default, 1940 .ndo_stop = ipoib_ib_dev_stop_default, 1941 }; 1942 1943 static struct net_device 1944 *ipoib_create_netdev_default(struct ib_device *hca, 1945 const char *name, 1946 unsigned char name_assign_type, 1947 void (*setup)(struct net_device *)) 1948 { 1949 struct net_device *dev; 1950 struct rdma_netdev *rn; 1951 1952 dev = alloc_netdev((int)sizeof(struct rdma_netdev), 1953 name, 1954 name_assign_type, setup); 1955 if (!dev) 1956 return NULL; 1957 1958 rn = netdev_priv(dev); 1959 1960 rn->send = ipoib_send; 1961 rn->attach_mcast = ipoib_mcast_attach; 1962 rn->detach_mcast = ipoib_mcast_detach; 1963 rn->free_rdma_netdev = free_netdev; 1964 rn->hca = hca; 1965 1966 dev->netdev_ops = &ipoib_netdev_default_pf; 1967 1968 return dev; 1969 } 1970 1971 static struct net_device *ipoib_get_netdev(struct ib_device *hca, u8 port, 1972 const char *name) 1973 { 1974 struct net_device *dev; 1975 1976 if (hca->alloc_rdma_netdev) { 1977 dev = hca->alloc_rdma_netdev(hca, port, 1978 RDMA_NETDEV_IPOIB, name, 1979 NET_NAME_UNKNOWN, 1980 ipoib_setup_common); 1981 if (IS_ERR_OR_NULL(dev) && PTR_ERR(dev) != -EOPNOTSUPP) 1982 return NULL; 1983 } 1984 1985 if (!hca->alloc_rdma_netdev || PTR_ERR(dev) == -EOPNOTSUPP) 1986 dev = ipoib_create_netdev_default(hca, name, NET_NAME_UNKNOWN, 1987 ipoib_setup_common); 1988 1989 return dev; 1990 } 1991 1992 struct ipoib_dev_priv *ipoib_intf_alloc(struct ib_device *hca, u8 port, 1993 const char *name) 1994 { 1995 struct net_device *dev; 1996 struct ipoib_dev_priv *priv; 1997 struct rdma_netdev *rn; 1998 1999 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2000 if (!priv) 2001 return NULL; 2002 2003 dev = ipoib_get_netdev(hca, port, name); 2004 if (!dev) 2005 goto free_priv; 2006 2007 priv->rn_ops = dev->netdev_ops; 2008 2009 /* fixme : should be after the query_cap */ 2010 if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION) 2011 dev->netdev_ops = &ipoib_netdev_ops_vf; 2012 else 2013 dev->netdev_ops = &ipoib_netdev_ops_pf; 2014 2015 rn = netdev_priv(dev); 2016 rn->clnt_priv = priv; 2017 ipoib_build_priv(dev); 2018 2019 return priv; 2020 free_priv: 2021 kfree(priv); 2022 return NULL; 2023 } 2024 2025 static ssize_t show_pkey(struct device *dev, 2026 struct device_attribute *attr, char *buf) 2027 { 2028 struct net_device *ndev = to_net_dev(dev); 2029 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2030 2031 return sprintf(buf, "0x%04x\n", priv->pkey); 2032 } 2033 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 2034 2035 static ssize_t show_umcast(struct device *dev, 2036 struct device_attribute *attr, char *buf) 2037 { 2038 struct net_device *ndev = to_net_dev(dev); 2039 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2040 2041 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); 2042 } 2043 2044 void ipoib_set_umcast(struct net_device *ndev, int umcast_val) 2045 { 2046 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2047 2048 if (umcast_val > 0) { 2049 set_bit(IPOIB_FLAG_UMCAST, &priv->flags); 2050 ipoib_warn(priv, "ignoring multicast groups joined directly " 2051 "by userspace\n"); 2052 } else 2053 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); 2054 } 2055 2056 static ssize_t set_umcast(struct device *dev, 2057 struct device_attribute *attr, 2058 const char *buf, size_t count) 2059 { 2060 unsigned long umcast_val = simple_strtoul(buf, NULL, 0); 2061 2062 ipoib_set_umcast(to_net_dev(dev), umcast_val); 2063 2064 return count; 2065 } 2066 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); 2067 2068 int ipoib_add_umcast_attr(struct net_device *dev) 2069 { 2070 return device_create_file(&dev->dev, &dev_attr_umcast); 2071 } 2072 2073 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid) 2074 { 2075 struct ipoib_dev_priv *child_priv; 2076 struct net_device *netdev = priv->dev; 2077 2078 netif_addr_lock_bh(netdev); 2079 2080 memcpy(&priv->local_gid.global.interface_id, 2081 &gid->global.interface_id, 2082 sizeof(gid->global.interface_id)); 2083 memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid)); 2084 clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 2085 2086 netif_addr_unlock_bh(netdev); 2087 2088 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 2089 down_read(&priv->vlan_rwsem); 2090 list_for_each_entry(child_priv, &priv->child_intfs, list) 2091 set_base_guid(child_priv, gid); 2092 up_read(&priv->vlan_rwsem); 2093 } 2094 } 2095 2096 static int ipoib_check_lladdr(struct net_device *dev, 2097 struct sockaddr_storage *ss) 2098 { 2099 union ib_gid *gid = (union ib_gid *)(ss->__data + 4); 2100 int ret = 0; 2101 2102 netif_addr_lock_bh(dev); 2103 2104 /* Make sure the QPN, reserved and subnet prefix match the current 2105 * lladdr, it also makes sure the lladdr is unicast. 2106 */ 2107 if (memcmp(dev->dev_addr, ss->__data, 2108 4 + sizeof(gid->global.subnet_prefix)) || 2109 gid->global.interface_id == 0) 2110 ret = -EINVAL; 2111 2112 netif_addr_unlock_bh(dev); 2113 2114 return ret; 2115 } 2116 2117 static int ipoib_set_mac(struct net_device *dev, void *addr) 2118 { 2119 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2120 struct sockaddr_storage *ss = addr; 2121 int ret; 2122 2123 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) 2124 return -EBUSY; 2125 2126 ret = ipoib_check_lladdr(dev, ss); 2127 if (ret) 2128 return ret; 2129 2130 set_base_guid(priv, (union ib_gid *)(ss->__data + 4)); 2131 2132 queue_work(ipoib_workqueue, &priv->flush_light); 2133 2134 return 0; 2135 } 2136 2137 static ssize_t create_child(struct device *dev, 2138 struct device_attribute *attr, 2139 const char *buf, size_t count) 2140 { 2141 int pkey; 2142 int ret; 2143 2144 if (sscanf(buf, "%i", &pkey) != 1) 2145 return -EINVAL; 2146 2147 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000) 2148 return -EINVAL; 2149 2150 /* 2151 * Set the full membership bit, so that we join the right 2152 * broadcast group, etc. 2153 */ 2154 pkey |= 0x8000; 2155 2156 ret = ipoib_vlan_add(to_net_dev(dev), pkey); 2157 2158 return ret ? ret : count; 2159 } 2160 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child); 2161 2162 static ssize_t delete_child(struct device *dev, 2163 struct device_attribute *attr, 2164 const char *buf, size_t count) 2165 { 2166 int pkey; 2167 int ret; 2168 2169 if (sscanf(buf, "%i", &pkey) != 1) 2170 return -EINVAL; 2171 2172 if (pkey < 0 || pkey > 0xffff) 2173 return -EINVAL; 2174 2175 ret = ipoib_vlan_delete(to_net_dev(dev), pkey); 2176 2177 return ret ? ret : count; 2178 2179 } 2180 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child); 2181 2182 int ipoib_add_pkey_attr(struct net_device *dev) 2183 { 2184 return device_create_file(&dev->dev, &dev_attr_pkey); 2185 } 2186 2187 void ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca) 2188 { 2189 priv->hca_caps = hca->attrs.device_cap_flags; 2190 2191 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { 2192 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM; 2193 2194 if (priv->hca_caps & IB_DEVICE_UD_TSO) 2195 priv->dev->hw_features |= NETIF_F_TSO; 2196 2197 priv->dev->features |= priv->dev->hw_features; 2198 } 2199 } 2200 2201 static struct net_device *ipoib_add_port(const char *format, 2202 struct ib_device *hca, u8 port) 2203 { 2204 struct ipoib_dev_priv *priv; 2205 struct ib_port_attr attr; 2206 struct rdma_netdev *rn; 2207 int result = -ENOMEM; 2208 2209 priv = ipoib_intf_alloc(hca, port, format); 2210 if (!priv) 2211 goto alloc_mem_failed; 2212 2213 SET_NETDEV_DEV(priv->dev, hca->dev.parent); 2214 priv->dev->dev_id = port - 1; 2215 2216 result = ib_query_port(hca, port, &attr); 2217 if (result) { 2218 printk(KERN_WARNING "%s: ib_query_port %d failed\n", 2219 hca->name, port); 2220 goto device_init_failed; 2221 } 2222 2223 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu); 2224 2225 /* MTU will be reset when mcast join happens */ 2226 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); 2227 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu; 2228 priv->dev->max_mtu = IPOIB_CM_MTU; 2229 2230 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh); 2231 2232 result = ib_query_pkey(hca, port, 0, &priv->pkey); 2233 if (result) { 2234 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n", 2235 hca->name, port, result); 2236 goto device_init_failed; 2237 } 2238 2239 ipoib_set_dev_features(priv, hca); 2240 2241 /* 2242 * Set the full membership bit, so that we join the right 2243 * broadcast group, etc. 2244 */ 2245 priv->pkey |= 0x8000; 2246 2247 priv->dev->broadcast[8] = priv->pkey >> 8; 2248 priv->dev->broadcast[9] = priv->pkey & 0xff; 2249 2250 result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL); 2251 if (result) { 2252 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n", 2253 hca->name, port, result); 2254 goto device_init_failed; 2255 } 2256 2257 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, 2258 sizeof(union ib_gid)); 2259 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 2260 2261 result = ipoib_dev_init(priv->dev, hca, port); 2262 if (result) { 2263 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n", 2264 hca->name, port, result); 2265 goto device_init_failed; 2266 } 2267 2268 INIT_IB_EVENT_HANDLER(&priv->event_handler, 2269 priv->ca, ipoib_event); 2270 ib_register_event_handler(&priv->event_handler); 2271 2272 result = register_netdev(priv->dev); 2273 if (result) { 2274 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n", 2275 hca->name, port, result); 2276 goto register_failed; 2277 } 2278 2279 result = -ENOMEM; 2280 if (ipoib_cm_add_mode_attr(priv->dev)) 2281 goto sysfs_failed; 2282 if (ipoib_add_pkey_attr(priv->dev)) 2283 goto sysfs_failed; 2284 if (ipoib_add_umcast_attr(priv->dev)) 2285 goto sysfs_failed; 2286 if (device_create_file(&priv->dev->dev, &dev_attr_create_child)) 2287 goto sysfs_failed; 2288 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child)) 2289 goto sysfs_failed; 2290 2291 return priv->dev; 2292 2293 sysfs_failed: 2294 unregister_netdev(priv->dev); 2295 2296 register_failed: 2297 ib_unregister_event_handler(&priv->event_handler); 2298 flush_workqueue(ipoib_workqueue); 2299 /* Stop GC if started before flush */ 2300 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 2301 cancel_delayed_work(&priv->neigh_reap_task); 2302 flush_workqueue(priv->wq); 2303 ipoib_dev_cleanup(priv->dev); 2304 2305 device_init_failed: 2306 rn = netdev_priv(priv->dev); 2307 rn->free_rdma_netdev(priv->dev); 2308 kfree(priv); 2309 2310 alloc_mem_failed: 2311 return ERR_PTR(result); 2312 } 2313 2314 static void ipoib_add_one(struct ib_device *device) 2315 { 2316 struct list_head *dev_list; 2317 struct net_device *dev; 2318 struct ipoib_dev_priv *priv; 2319 int p; 2320 int count = 0; 2321 2322 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL); 2323 if (!dev_list) 2324 return; 2325 2326 INIT_LIST_HEAD(dev_list); 2327 2328 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) { 2329 if (!rdma_protocol_ib(device, p)) 2330 continue; 2331 dev = ipoib_add_port("ib%d", device, p); 2332 if (!IS_ERR(dev)) { 2333 priv = ipoib_priv(dev); 2334 list_add_tail(&priv->list, dev_list); 2335 count++; 2336 } 2337 } 2338 2339 if (!count) { 2340 pr_err("Failed to init port, removing it\n"); 2341 ipoib_remove_one(device, dev_list); 2342 return; 2343 } 2344 2345 ib_set_client_data(device, &ipoib_client, dev_list); 2346 } 2347 2348 static void ipoib_remove_one(struct ib_device *device, void *client_data) 2349 { 2350 struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv; 2351 struct list_head *dev_list = client_data; 2352 2353 if (!dev_list) 2354 return; 2355 2356 list_for_each_entry_safe(priv, tmp, dev_list, list) { 2357 struct rdma_netdev *parent_rn = netdev_priv(priv->dev); 2358 2359 ib_unregister_event_handler(&priv->event_handler); 2360 flush_workqueue(ipoib_workqueue); 2361 2362 /* mark interface in the middle of destruction */ 2363 set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags); 2364 2365 rtnl_lock(); 2366 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP); 2367 rtnl_unlock(); 2368 2369 /* Stop GC */ 2370 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 2371 cancel_delayed_work(&priv->neigh_reap_task); 2372 flush_workqueue(priv->wq); 2373 2374 /* Wrap rtnl_lock/unlock with mutex to protect sysfs calls */ 2375 mutex_lock(&priv->sysfs_mutex); 2376 unregister_netdev(priv->dev); 2377 mutex_unlock(&priv->sysfs_mutex); 2378 2379 parent_rn->free_rdma_netdev(priv->dev); 2380 2381 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) { 2382 struct rdma_netdev *child_rn; 2383 2384 child_rn = netdev_priv(cpriv->dev); 2385 child_rn->free_rdma_netdev(cpriv->dev); 2386 kfree(cpriv); 2387 } 2388 2389 kfree(priv); 2390 } 2391 2392 kfree(dev_list); 2393 } 2394 2395 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2396 static struct notifier_block ipoib_netdev_notifier = { 2397 .notifier_call = ipoib_netdev_event, 2398 }; 2399 #endif 2400 2401 static int __init ipoib_init_module(void) 2402 { 2403 int ret; 2404 2405 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); 2406 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); 2407 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); 2408 2409 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); 2410 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); 2411 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE); 2412 #ifdef CONFIG_INFINIBAND_IPOIB_CM 2413 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); 2414 ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0); 2415 #endif 2416 2417 /* 2418 * When copying small received packets, we only copy from the 2419 * linear data part of the SKB, so we rely on this condition. 2420 */ 2421 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE); 2422 2423 ret = ipoib_register_debugfs(); 2424 if (ret) 2425 return ret; 2426 2427 /* 2428 * We create a global workqueue here that is used for all flush 2429 * operations. However, if you attempt to flush a workqueue 2430 * from a task on that same workqueue, it deadlocks the system. 2431 * We want to be able to flush the tasks associated with a 2432 * specific net device, so we also create a workqueue for each 2433 * netdevice. We queue up the tasks for that device only on 2434 * its private workqueue, and we only queue up flush events 2435 * on our global flush workqueue. This avoids the deadlocks. 2436 */ 2437 ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 2438 WQ_MEM_RECLAIM); 2439 if (!ipoib_workqueue) { 2440 ret = -ENOMEM; 2441 goto err_fs; 2442 } 2443 2444 ib_sa_register_client(&ipoib_sa_client); 2445 2446 ret = ib_register_client(&ipoib_client); 2447 if (ret) 2448 goto err_sa; 2449 2450 ret = ipoib_netlink_init(); 2451 if (ret) 2452 goto err_client; 2453 2454 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2455 register_netdevice_notifier(&ipoib_netdev_notifier); 2456 #endif 2457 return 0; 2458 2459 err_client: 2460 ib_unregister_client(&ipoib_client); 2461 2462 err_sa: 2463 ib_sa_unregister_client(&ipoib_sa_client); 2464 destroy_workqueue(ipoib_workqueue); 2465 2466 err_fs: 2467 ipoib_unregister_debugfs(); 2468 2469 return ret; 2470 } 2471 2472 static void __exit ipoib_cleanup_module(void) 2473 { 2474 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2475 unregister_netdevice_notifier(&ipoib_netdev_notifier); 2476 #endif 2477 ipoib_netlink_fini(); 2478 ib_unregister_client(&ipoib_client); 2479 ib_sa_unregister_client(&ipoib_sa_client); 2480 ipoib_unregister_debugfs(); 2481 destroy_workqueue(ipoib_workqueue); 2482 } 2483 2484 module_init(ipoib_init_module); 2485 module_exit(ipoib_cleanup_module); 2486