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 #include <linux/pci.h> 55 56 #define DRV_VERSION "1.0.0" 57 58 const char ipoib_driver_version[] = DRV_VERSION; 59 60 MODULE_AUTHOR("Roland Dreier"); 61 MODULE_DESCRIPTION("IP-over-InfiniBand net driver"); 62 MODULE_LICENSE("Dual BSD/GPL"); 63 MODULE_VERSION(DRV_VERSION); 64 65 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE; 66 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE; 67 68 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444); 69 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue"); 70 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444); 71 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue"); 72 73 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 74 int ipoib_debug_level; 75 76 module_param_named(debug_level, ipoib_debug_level, int, 0644); 77 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0"); 78 #endif 79 80 struct ipoib_path_iter { 81 struct net_device *dev; 82 struct ipoib_path path; 83 }; 84 85 static const u8 ipv4_bcast_addr[] = { 86 0x00, 0xff, 0xff, 0xff, 87 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, 88 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff 89 }; 90 91 struct workqueue_struct *ipoib_workqueue; 92 93 struct ib_sa_client ipoib_sa_client; 94 95 static void ipoib_add_one(struct ib_device *device); 96 static void ipoib_remove_one(struct ib_device *device, void *client_data); 97 static void ipoib_neigh_reclaim(struct rcu_head *rp); 98 static struct net_device *ipoib_get_net_dev_by_params( 99 struct ib_device *dev, u8 port, u16 pkey, 100 const union ib_gid *gid, const struct sockaddr *addr, 101 void *client_data); 102 static int ipoib_set_mac(struct net_device *dev, void *addr); 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 void 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; 921 } 922 923 path = __path_find(dev, daddr + 4); 924 if (!path) { 925 path = path_rec_create(dev, daddr + 4); 926 if (!path) 927 goto err_path; 928 929 __path_add(dev, path); 930 } 931 932 list_add_tail(&neigh->list, &path->neigh_list); 933 934 if (path->ah) { 935 kref_get(&path->ah->ref); 936 neigh->ah = path->ah; 937 938 if (ipoib_cm_enabled(dev, neigh->daddr)) { 939 if (!ipoib_cm_get(neigh)) 940 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh)); 941 if (!ipoib_cm_get(neigh)) { 942 ipoib_neigh_free(neigh); 943 goto err_drop; 944 } 945 if (skb_queue_len(&neigh->queue) < 946 IPOIB_MAX_PATH_REC_QUEUE) { 947 push_pseudo_header(skb, neigh->daddr); 948 __skb_queue_tail(&neigh->queue, skb); 949 } else { 950 ipoib_warn(priv, "queue length limit %d. Packet drop.\n", 951 skb_queue_len(&neigh->queue)); 952 goto err_drop; 953 } 954 } else { 955 spin_unlock_irqrestore(&priv->lock, flags); 956 path->ah->last_send = rn->send(dev, skb, path->ah->ah, 957 IPOIB_QPN(daddr)); 958 ipoib_neigh_put(neigh); 959 return; 960 } 961 } else { 962 neigh->ah = NULL; 963 964 if (!path->query && path_rec_start(dev, path)) 965 goto err_path; 966 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 967 push_pseudo_header(skb, neigh->daddr); 968 __skb_queue_tail(&neigh->queue, skb); 969 } else { 970 goto err_drop; 971 } 972 } 973 974 spin_unlock_irqrestore(&priv->lock, flags); 975 ipoib_neigh_put(neigh); 976 return; 977 978 err_path: 979 ipoib_neigh_free(neigh); 980 err_drop: 981 ++dev->stats.tx_dropped; 982 dev_kfree_skb_any(skb); 983 984 spin_unlock_irqrestore(&priv->lock, flags); 985 ipoib_neigh_put(neigh); 986 } 987 988 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, 989 struct ipoib_pseudo_header *phdr) 990 { 991 struct ipoib_dev_priv *priv = ipoib_priv(dev); 992 struct rdma_netdev *rn = netdev_priv(dev); 993 struct ipoib_path *path; 994 unsigned long flags; 995 996 spin_lock_irqsave(&priv->lock, flags); 997 998 path = __path_find(dev, phdr->hwaddr + 4); 999 if (!path || !path->valid) { 1000 int new_path = 0; 1001 1002 if (!path) { 1003 path = path_rec_create(dev, phdr->hwaddr + 4); 1004 new_path = 1; 1005 } 1006 if (path) { 1007 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1008 push_pseudo_header(skb, phdr->hwaddr); 1009 __skb_queue_tail(&path->queue, skb); 1010 } else { 1011 ++dev->stats.tx_dropped; 1012 dev_kfree_skb_any(skb); 1013 } 1014 1015 if (!path->query && path_rec_start(dev, path)) { 1016 spin_unlock_irqrestore(&priv->lock, flags); 1017 if (new_path) 1018 path_free(dev, path); 1019 return; 1020 } else 1021 __path_add(dev, path); 1022 } else { 1023 ++dev->stats.tx_dropped; 1024 dev_kfree_skb_any(skb); 1025 } 1026 1027 spin_unlock_irqrestore(&priv->lock, flags); 1028 return; 1029 } 1030 1031 if (path->ah) { 1032 ipoib_dbg(priv, "Send unicast ARP to %08x\n", 1033 be32_to_cpu(sa_path_get_dlid(&path->pathrec))); 1034 1035 spin_unlock_irqrestore(&priv->lock, flags); 1036 path->ah->last_send = rn->send(dev, skb, path->ah->ah, 1037 IPOIB_QPN(phdr->hwaddr)); 1038 return; 1039 } else if ((path->query || !path_rec_start(dev, path)) && 1040 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1041 push_pseudo_header(skb, phdr->hwaddr); 1042 __skb_queue_tail(&path->queue, skb); 1043 } else { 1044 ++dev->stats.tx_dropped; 1045 dev_kfree_skb_any(skb); 1046 } 1047 1048 spin_unlock_irqrestore(&priv->lock, flags); 1049 } 1050 1051 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 1052 { 1053 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1054 struct rdma_netdev *rn = netdev_priv(dev); 1055 struct ipoib_neigh *neigh; 1056 struct ipoib_pseudo_header *phdr; 1057 struct ipoib_header *header; 1058 unsigned long flags; 1059 1060 phdr = (struct ipoib_pseudo_header *) skb->data; 1061 skb_pull(skb, sizeof(*phdr)); 1062 header = (struct ipoib_header *) skb->data; 1063 1064 if (unlikely(phdr->hwaddr[4] == 0xff)) { 1065 /* multicast, arrange "if" according to probability */ 1066 if ((header->proto != htons(ETH_P_IP)) && 1067 (header->proto != htons(ETH_P_IPV6)) && 1068 (header->proto != htons(ETH_P_ARP)) && 1069 (header->proto != htons(ETH_P_RARP)) && 1070 (header->proto != htons(ETH_P_TIPC))) { 1071 /* ethertype not supported by IPoIB */ 1072 ++dev->stats.tx_dropped; 1073 dev_kfree_skb_any(skb); 1074 return NETDEV_TX_OK; 1075 } 1076 /* Add in the P_Key for multicast*/ 1077 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff; 1078 phdr->hwaddr[9] = priv->pkey & 0xff; 1079 1080 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1081 if (likely(neigh)) 1082 goto send_using_neigh; 1083 ipoib_mcast_send(dev, phdr->hwaddr, skb); 1084 return NETDEV_TX_OK; 1085 } 1086 1087 /* unicast, arrange "switch" according to probability */ 1088 switch (header->proto) { 1089 case htons(ETH_P_IP): 1090 case htons(ETH_P_IPV6): 1091 case htons(ETH_P_TIPC): 1092 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1093 if (unlikely(!neigh)) { 1094 neigh_add_path(skb, phdr->hwaddr, dev); 1095 return NETDEV_TX_OK; 1096 } 1097 break; 1098 case htons(ETH_P_ARP): 1099 case htons(ETH_P_RARP): 1100 /* for unicast ARP and RARP should always perform path find */ 1101 unicast_arp_send(skb, dev, phdr); 1102 return NETDEV_TX_OK; 1103 default: 1104 /* ethertype not supported by IPoIB */ 1105 ++dev->stats.tx_dropped; 1106 dev_kfree_skb_any(skb); 1107 return NETDEV_TX_OK; 1108 } 1109 1110 send_using_neigh: 1111 /* note we now hold a ref to neigh */ 1112 if (ipoib_cm_get(neigh)) { 1113 if (ipoib_cm_up(neigh)) { 1114 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); 1115 goto unref; 1116 } 1117 } else if (neigh->ah) { 1118 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah, 1119 IPOIB_QPN(phdr->hwaddr)); 1120 goto unref; 1121 } 1122 1123 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1124 push_pseudo_header(skb, phdr->hwaddr); 1125 spin_lock_irqsave(&priv->lock, flags); 1126 __skb_queue_tail(&neigh->queue, skb); 1127 spin_unlock_irqrestore(&priv->lock, flags); 1128 } else { 1129 ++dev->stats.tx_dropped; 1130 dev_kfree_skb_any(skb); 1131 } 1132 1133 unref: 1134 ipoib_neigh_put(neigh); 1135 1136 return NETDEV_TX_OK; 1137 } 1138 1139 static void ipoib_timeout(struct net_device *dev) 1140 { 1141 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1142 1143 ipoib_warn(priv, "transmit timeout: latency %d msecs\n", 1144 jiffies_to_msecs(jiffies - dev_trans_start(dev))); 1145 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n", 1146 netif_queue_stopped(dev), 1147 priv->tx_head, priv->tx_tail); 1148 /* XXX reset QP, etc. */ 1149 } 1150 1151 static int ipoib_hard_header(struct sk_buff *skb, 1152 struct net_device *dev, 1153 unsigned short type, 1154 const void *daddr, const void *saddr, unsigned len) 1155 { 1156 struct ipoib_header *header; 1157 1158 header = skb_push(skb, sizeof *header); 1159 1160 header->proto = htons(type); 1161 header->reserved = 0; 1162 1163 /* 1164 * we don't rely on dst_entry structure, always stuff the 1165 * destination address into skb hard header so we can figure out where 1166 * to send the packet later. 1167 */ 1168 push_pseudo_header(skb, daddr); 1169 1170 return IPOIB_HARD_LEN; 1171 } 1172 1173 static void ipoib_set_mcast_list(struct net_device *dev) 1174 { 1175 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1176 1177 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 1178 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); 1179 return; 1180 } 1181 1182 queue_work(priv->wq, &priv->restart_task); 1183 } 1184 1185 static int ipoib_get_iflink(const struct net_device *dev) 1186 { 1187 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1188 1189 /* parent interface */ 1190 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1191 return dev->ifindex; 1192 1193 /* child/vlan interface */ 1194 return priv->parent->ifindex; 1195 } 1196 1197 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr) 1198 { 1199 /* 1200 * Use only the address parts that contributes to spreading 1201 * The subnet prefix is not used as one can not connect to 1202 * same remote port (GUID) using the same remote QPN via two 1203 * different subnets. 1204 */ 1205 /* qpn octets[1:4) & port GUID octets[12:20) */ 1206 u32 *d32 = (u32 *) daddr; 1207 u32 hv; 1208 1209 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0); 1210 return hv & htbl->mask; 1211 } 1212 1213 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr) 1214 { 1215 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1216 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1217 struct ipoib_neigh_hash *htbl; 1218 struct ipoib_neigh *neigh = NULL; 1219 u32 hash_val; 1220 1221 rcu_read_lock_bh(); 1222 1223 htbl = rcu_dereference_bh(ntbl->htbl); 1224 1225 if (!htbl) 1226 goto out_unlock; 1227 1228 hash_val = ipoib_addr_hash(htbl, daddr); 1229 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]); 1230 neigh != NULL; 1231 neigh = rcu_dereference_bh(neigh->hnext)) { 1232 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1233 /* found, take one ref on behalf of the caller */ 1234 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1235 /* deleted */ 1236 neigh = NULL; 1237 goto out_unlock; 1238 } 1239 1240 if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)) 1241 neigh->alive = jiffies; 1242 goto out_unlock; 1243 } 1244 } 1245 1246 out_unlock: 1247 rcu_read_unlock_bh(); 1248 return neigh; 1249 } 1250 1251 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv) 1252 { 1253 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1254 struct ipoib_neigh_hash *htbl; 1255 unsigned long neigh_obsolete; 1256 unsigned long dt; 1257 unsigned long flags; 1258 int i; 1259 LIST_HEAD(remove_list); 1260 1261 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 1262 return; 1263 1264 spin_lock_irqsave(&priv->lock, flags); 1265 1266 htbl = rcu_dereference_protected(ntbl->htbl, 1267 lockdep_is_held(&priv->lock)); 1268 1269 if (!htbl) 1270 goto out_unlock; 1271 1272 /* neigh is obsolete if it was idle for two GC periods */ 1273 dt = 2 * arp_tbl.gc_interval; 1274 neigh_obsolete = jiffies - dt; 1275 /* handle possible race condition */ 1276 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 1277 goto out_unlock; 1278 1279 for (i = 0; i < htbl->size; i++) { 1280 struct ipoib_neigh *neigh; 1281 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1282 1283 while ((neigh = rcu_dereference_protected(*np, 1284 lockdep_is_held(&priv->lock))) != NULL) { 1285 /* was the neigh idle for two GC periods */ 1286 if (time_after(neigh_obsolete, neigh->alive)) { 1287 1288 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list); 1289 1290 rcu_assign_pointer(*np, 1291 rcu_dereference_protected(neigh->hnext, 1292 lockdep_is_held(&priv->lock))); 1293 /* remove from path/mc list */ 1294 list_del_init(&neigh->list); 1295 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1296 } else { 1297 np = &neigh->hnext; 1298 } 1299 1300 } 1301 } 1302 1303 out_unlock: 1304 spin_unlock_irqrestore(&priv->lock, flags); 1305 ipoib_mcast_remove_list(&remove_list); 1306 } 1307 1308 static void ipoib_reap_neigh(struct work_struct *work) 1309 { 1310 struct ipoib_dev_priv *priv = 1311 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work); 1312 1313 __ipoib_reap_neigh(priv); 1314 1315 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 1316 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1317 arp_tbl.gc_interval); 1318 } 1319 1320 1321 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr, 1322 struct net_device *dev) 1323 { 1324 struct ipoib_neigh *neigh; 1325 1326 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC); 1327 if (!neigh) 1328 return NULL; 1329 1330 neigh->dev = dev; 1331 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr)); 1332 skb_queue_head_init(&neigh->queue); 1333 INIT_LIST_HEAD(&neigh->list); 1334 ipoib_cm_set(neigh, NULL); 1335 /* one ref on behalf of the caller */ 1336 atomic_set(&neigh->refcnt, 1); 1337 1338 return neigh; 1339 } 1340 1341 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr, 1342 struct net_device *dev) 1343 { 1344 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1345 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1346 struct ipoib_neigh_hash *htbl; 1347 struct ipoib_neigh *neigh; 1348 u32 hash_val; 1349 1350 htbl = rcu_dereference_protected(ntbl->htbl, 1351 lockdep_is_held(&priv->lock)); 1352 if (!htbl) { 1353 neigh = NULL; 1354 goto out_unlock; 1355 } 1356 1357 /* need to add a new neigh, but maybe some other thread succeeded? 1358 * recalc hash, maybe hash resize took place so we do a search 1359 */ 1360 hash_val = ipoib_addr_hash(htbl, daddr); 1361 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val], 1362 lockdep_is_held(&priv->lock)); 1363 neigh != NULL; 1364 neigh = rcu_dereference_protected(neigh->hnext, 1365 lockdep_is_held(&priv->lock))) { 1366 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1367 /* found, take one ref on behalf of the caller */ 1368 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1369 /* deleted */ 1370 neigh = NULL; 1371 break; 1372 } 1373 neigh->alive = jiffies; 1374 goto out_unlock; 1375 } 1376 } 1377 1378 neigh = ipoib_neigh_ctor(daddr, dev); 1379 if (!neigh) 1380 goto out_unlock; 1381 1382 /* one ref on behalf of the hash table */ 1383 atomic_inc(&neigh->refcnt); 1384 neigh->alive = jiffies; 1385 /* put in hash */ 1386 rcu_assign_pointer(neigh->hnext, 1387 rcu_dereference_protected(htbl->buckets[hash_val], 1388 lockdep_is_held(&priv->lock))); 1389 rcu_assign_pointer(htbl->buckets[hash_val], neigh); 1390 atomic_inc(&ntbl->entries); 1391 1392 out_unlock: 1393 1394 return neigh; 1395 } 1396 1397 void ipoib_neigh_dtor(struct ipoib_neigh *neigh) 1398 { 1399 /* neigh reference count was dropprd to zero */ 1400 struct net_device *dev = neigh->dev; 1401 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1402 struct sk_buff *skb; 1403 if (neigh->ah) 1404 ipoib_put_ah(neigh->ah); 1405 while ((skb = __skb_dequeue(&neigh->queue))) { 1406 ++dev->stats.tx_dropped; 1407 dev_kfree_skb_any(skb); 1408 } 1409 if (ipoib_cm_get(neigh)) 1410 ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); 1411 ipoib_dbg(ipoib_priv(dev), 1412 "neigh free for %06x %pI6\n", 1413 IPOIB_QPN(neigh->daddr), 1414 neigh->daddr + 4); 1415 kfree(neigh); 1416 if (atomic_dec_and_test(&priv->ntbl.entries)) { 1417 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags)) 1418 complete(&priv->ntbl.flushed); 1419 } 1420 } 1421 1422 static void ipoib_neigh_reclaim(struct rcu_head *rp) 1423 { 1424 /* Called as a result of removal from hash table */ 1425 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu); 1426 /* note TX context may hold another ref */ 1427 ipoib_neigh_put(neigh); 1428 } 1429 1430 void ipoib_neigh_free(struct ipoib_neigh *neigh) 1431 { 1432 struct net_device *dev = neigh->dev; 1433 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1434 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1435 struct ipoib_neigh_hash *htbl; 1436 struct ipoib_neigh __rcu **np; 1437 struct ipoib_neigh *n; 1438 u32 hash_val; 1439 1440 htbl = rcu_dereference_protected(ntbl->htbl, 1441 lockdep_is_held(&priv->lock)); 1442 if (!htbl) 1443 return; 1444 1445 hash_val = ipoib_addr_hash(htbl, neigh->daddr); 1446 np = &htbl->buckets[hash_val]; 1447 for (n = rcu_dereference_protected(*np, 1448 lockdep_is_held(&priv->lock)); 1449 n != NULL; 1450 n = rcu_dereference_protected(*np, 1451 lockdep_is_held(&priv->lock))) { 1452 if (n == neigh) { 1453 /* found */ 1454 rcu_assign_pointer(*np, 1455 rcu_dereference_protected(neigh->hnext, 1456 lockdep_is_held(&priv->lock))); 1457 /* remove from parent list */ 1458 list_del_init(&neigh->list); 1459 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1460 return; 1461 } else { 1462 np = &n->hnext; 1463 } 1464 } 1465 } 1466 1467 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv) 1468 { 1469 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1470 struct ipoib_neigh_hash *htbl; 1471 struct ipoib_neigh __rcu **buckets; 1472 u32 size; 1473 1474 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1475 ntbl->htbl = NULL; 1476 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL); 1477 if (!htbl) 1478 return -ENOMEM; 1479 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1480 size = roundup_pow_of_two(arp_tbl.gc_thresh3); 1481 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL); 1482 if (!buckets) { 1483 kfree(htbl); 1484 return -ENOMEM; 1485 } 1486 htbl->size = size; 1487 htbl->mask = (size - 1); 1488 htbl->buckets = buckets; 1489 RCU_INIT_POINTER(ntbl->htbl, htbl); 1490 htbl->ntbl = ntbl; 1491 atomic_set(&ntbl->entries, 0); 1492 1493 /* start garbage collection */ 1494 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1495 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1496 arp_tbl.gc_interval); 1497 1498 return 0; 1499 } 1500 1501 static void neigh_hash_free_rcu(struct rcu_head *head) 1502 { 1503 struct ipoib_neigh_hash *htbl = container_of(head, 1504 struct ipoib_neigh_hash, 1505 rcu); 1506 struct ipoib_neigh __rcu **buckets = htbl->buckets; 1507 struct ipoib_neigh_table *ntbl = htbl->ntbl; 1508 1509 kfree(buckets); 1510 kfree(htbl); 1511 complete(&ntbl->deleted); 1512 } 1513 1514 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid) 1515 { 1516 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1517 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1518 struct ipoib_neigh_hash *htbl; 1519 unsigned long flags; 1520 int i; 1521 1522 /* remove all neigh connected to a given path or mcast */ 1523 spin_lock_irqsave(&priv->lock, flags); 1524 1525 htbl = rcu_dereference_protected(ntbl->htbl, 1526 lockdep_is_held(&priv->lock)); 1527 1528 if (!htbl) 1529 goto out_unlock; 1530 1531 for (i = 0; i < htbl->size; i++) { 1532 struct ipoib_neigh *neigh; 1533 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1534 1535 while ((neigh = rcu_dereference_protected(*np, 1536 lockdep_is_held(&priv->lock))) != NULL) { 1537 /* delete neighs belong to this parent */ 1538 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) { 1539 rcu_assign_pointer(*np, 1540 rcu_dereference_protected(neigh->hnext, 1541 lockdep_is_held(&priv->lock))); 1542 /* remove from parent list */ 1543 list_del_init(&neigh->list); 1544 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1545 } else { 1546 np = &neigh->hnext; 1547 } 1548 1549 } 1550 } 1551 out_unlock: 1552 spin_unlock_irqrestore(&priv->lock, flags); 1553 } 1554 1555 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv) 1556 { 1557 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1558 struct ipoib_neigh_hash *htbl; 1559 unsigned long flags; 1560 int i, wait_flushed = 0; 1561 1562 init_completion(&priv->ntbl.flushed); 1563 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1564 1565 spin_lock_irqsave(&priv->lock, flags); 1566 1567 htbl = rcu_dereference_protected(ntbl->htbl, 1568 lockdep_is_held(&priv->lock)); 1569 if (!htbl) 1570 goto out_unlock; 1571 1572 wait_flushed = atomic_read(&priv->ntbl.entries); 1573 if (!wait_flushed) 1574 goto free_htbl; 1575 1576 for (i = 0; i < htbl->size; i++) { 1577 struct ipoib_neigh *neigh; 1578 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1579 1580 while ((neigh = rcu_dereference_protected(*np, 1581 lockdep_is_held(&priv->lock))) != NULL) { 1582 rcu_assign_pointer(*np, 1583 rcu_dereference_protected(neigh->hnext, 1584 lockdep_is_held(&priv->lock))); 1585 /* remove from path/mc list */ 1586 list_del_init(&neigh->list); 1587 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1588 } 1589 } 1590 1591 free_htbl: 1592 rcu_assign_pointer(ntbl->htbl, NULL); 1593 call_rcu(&htbl->rcu, neigh_hash_free_rcu); 1594 1595 out_unlock: 1596 spin_unlock_irqrestore(&priv->lock, flags); 1597 if (wait_flushed) 1598 wait_for_completion(&priv->ntbl.flushed); 1599 } 1600 1601 static void ipoib_neigh_hash_uninit(struct net_device *dev) 1602 { 1603 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1604 int stopped; 1605 1606 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n"); 1607 init_completion(&priv->ntbl.deleted); 1608 1609 /* Stop GC if called at init fail need to cancel work */ 1610 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1611 if (!stopped) 1612 cancel_delayed_work(&priv->neigh_reap_task); 1613 1614 ipoib_flush_neighs(priv); 1615 1616 wait_for_completion(&priv->ntbl.deleted); 1617 } 1618 1619 static void ipoib_dev_uninit_default(struct net_device *dev) 1620 { 1621 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1622 1623 ipoib_transport_dev_cleanup(dev); 1624 1625 netif_napi_del(&priv->napi); 1626 1627 ipoib_cm_dev_cleanup(dev); 1628 1629 kfree(priv->rx_ring); 1630 vfree(priv->tx_ring); 1631 1632 priv->rx_ring = NULL; 1633 priv->tx_ring = NULL; 1634 } 1635 1636 static int ipoib_dev_init_default(struct net_device *dev) 1637 { 1638 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1639 1640 netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT); 1641 1642 /* Allocate RX/TX "rings" to hold queued skbs */ 1643 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring, 1644 GFP_KERNEL); 1645 if (!priv->rx_ring) 1646 goto out; 1647 1648 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring); 1649 if (!priv->tx_ring) { 1650 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n", 1651 priv->ca->name, ipoib_sendq_size); 1652 goto out_rx_ring_cleanup; 1653 } 1654 1655 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */ 1656 1657 if (ipoib_transport_dev_init(dev, priv->ca)) { 1658 pr_warn("%s: ipoib_transport_dev_init failed\n", 1659 priv->ca->name); 1660 goto out_tx_ring_cleanup; 1661 } 1662 1663 /* after qp created set dev address */ 1664 priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff; 1665 priv->dev->dev_addr[2] = (priv->qp->qp_num >> 8) & 0xff; 1666 priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff; 1667 1668 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func, 1669 (unsigned long)dev); 1670 1671 return 0; 1672 1673 out_tx_ring_cleanup: 1674 vfree(priv->tx_ring); 1675 1676 out_rx_ring_cleanup: 1677 kfree(priv->rx_ring); 1678 1679 out: 1680 netif_napi_del(&priv->napi); 1681 return -ENOMEM; 1682 } 1683 1684 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 1685 { 1686 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1687 int ret = -ENOMEM; 1688 1689 priv->ca = ca; 1690 priv->port = port; 1691 priv->qp = NULL; 1692 1693 /* 1694 * the various IPoIB tasks assume they will never race against 1695 * themselves, so always use a single thread workqueue 1696 */ 1697 priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM); 1698 if (!priv->wq) { 1699 pr_warn("%s: failed to allocate device WQ\n", dev->name); 1700 goto out; 1701 } 1702 1703 /* create pd, which used both for control and datapath*/ 1704 priv->pd = ib_alloc_pd(priv->ca, 0); 1705 if (IS_ERR(priv->pd)) { 1706 pr_warn("%s: failed to allocate PD\n", ca->name); 1707 goto clean_wq; 1708 } 1709 1710 ret = priv->rn_ops->ndo_init(dev); 1711 if (ret) { 1712 pr_warn("%s failed to init HW resource\n", dev->name); 1713 goto out_free_pd; 1714 } 1715 1716 if (ipoib_neigh_hash_init(priv) < 0) { 1717 pr_warn("%s failed to init neigh hash\n", dev->name); 1718 goto out_dev_uninit; 1719 } 1720 1721 if (dev->flags & IFF_UP) { 1722 if (ipoib_ib_dev_open(dev)) { 1723 pr_warn("%s failed to open device\n", dev->name); 1724 ret = -ENODEV; 1725 goto out_dev_uninit; 1726 } 1727 } 1728 1729 return 0; 1730 1731 out_dev_uninit: 1732 ipoib_ib_dev_cleanup(dev); 1733 1734 out_free_pd: 1735 if (priv->pd) { 1736 ib_dealloc_pd(priv->pd); 1737 priv->pd = NULL; 1738 } 1739 1740 clean_wq: 1741 if (priv->wq) { 1742 destroy_workqueue(priv->wq); 1743 priv->wq = NULL; 1744 } 1745 1746 out: 1747 return ret; 1748 } 1749 1750 void ipoib_dev_cleanup(struct net_device *dev) 1751 { 1752 struct ipoib_dev_priv *priv = ipoib_priv(dev), *cpriv, *tcpriv; 1753 LIST_HEAD(head); 1754 1755 ASSERT_RTNL(); 1756 1757 /* Delete any child interfaces first */ 1758 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) { 1759 /* Stop GC on child */ 1760 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags); 1761 cancel_delayed_work(&cpriv->neigh_reap_task); 1762 unregister_netdevice_queue(cpriv->dev, &head); 1763 } 1764 unregister_netdevice_many(&head); 1765 1766 ipoib_neigh_hash_uninit(dev); 1767 1768 ipoib_ib_dev_cleanup(dev); 1769 1770 /* no more works over the priv->wq */ 1771 if (priv->wq) { 1772 flush_workqueue(priv->wq); 1773 destroy_workqueue(priv->wq); 1774 priv->wq = NULL; 1775 } 1776 } 1777 1778 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state) 1779 { 1780 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1781 1782 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state); 1783 } 1784 1785 static int ipoib_get_vf_config(struct net_device *dev, int vf, 1786 struct ifla_vf_info *ivf) 1787 { 1788 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1789 int err; 1790 1791 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf); 1792 if (err) 1793 return err; 1794 1795 ivf->vf = vf; 1796 1797 return 0; 1798 } 1799 1800 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type) 1801 { 1802 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1803 1804 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID) 1805 return -EINVAL; 1806 1807 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type); 1808 } 1809 1810 static int ipoib_get_vf_stats(struct net_device *dev, int vf, 1811 struct ifla_vf_stats *vf_stats) 1812 { 1813 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1814 1815 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats); 1816 } 1817 1818 static const struct header_ops ipoib_header_ops = { 1819 .create = ipoib_hard_header, 1820 }; 1821 1822 static const struct net_device_ops ipoib_netdev_ops_pf = { 1823 .ndo_uninit = ipoib_uninit, 1824 .ndo_open = ipoib_open, 1825 .ndo_stop = ipoib_stop, 1826 .ndo_change_mtu = ipoib_change_mtu, 1827 .ndo_fix_features = ipoib_fix_features, 1828 .ndo_start_xmit = ipoib_start_xmit, 1829 .ndo_tx_timeout = ipoib_timeout, 1830 .ndo_set_rx_mode = ipoib_set_mcast_list, 1831 .ndo_get_iflink = ipoib_get_iflink, 1832 .ndo_set_vf_link_state = ipoib_set_vf_link_state, 1833 .ndo_get_vf_config = ipoib_get_vf_config, 1834 .ndo_get_vf_stats = ipoib_get_vf_stats, 1835 .ndo_set_vf_guid = ipoib_set_vf_guid, 1836 .ndo_set_mac_address = ipoib_set_mac, 1837 .ndo_get_stats64 = ipoib_get_stats, 1838 }; 1839 1840 static const struct net_device_ops ipoib_netdev_ops_vf = { 1841 .ndo_uninit = ipoib_uninit, 1842 .ndo_open = ipoib_open, 1843 .ndo_stop = ipoib_stop, 1844 .ndo_change_mtu = ipoib_change_mtu, 1845 .ndo_fix_features = ipoib_fix_features, 1846 .ndo_start_xmit = ipoib_start_xmit, 1847 .ndo_tx_timeout = ipoib_timeout, 1848 .ndo_set_rx_mode = ipoib_set_mcast_list, 1849 .ndo_get_iflink = ipoib_get_iflink, 1850 .ndo_get_stats64 = ipoib_get_stats, 1851 }; 1852 1853 void ipoib_setup_common(struct net_device *dev) 1854 { 1855 dev->header_ops = &ipoib_header_ops; 1856 1857 ipoib_set_ethtool_ops(dev); 1858 1859 dev->watchdog_timeo = HZ; 1860 1861 dev->flags |= IFF_BROADCAST | IFF_MULTICAST; 1862 1863 dev->hard_header_len = IPOIB_HARD_LEN; 1864 dev->addr_len = INFINIBAND_ALEN; 1865 dev->type = ARPHRD_INFINIBAND; 1866 dev->tx_queue_len = ipoib_sendq_size * 2; 1867 dev->features = (NETIF_F_VLAN_CHALLENGED | 1868 NETIF_F_HIGHDMA); 1869 netif_keep_dst(dev); 1870 1871 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); 1872 } 1873 1874 static void ipoib_build_priv(struct net_device *dev) 1875 { 1876 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1877 1878 priv->dev = dev; 1879 spin_lock_init(&priv->lock); 1880 init_rwsem(&priv->vlan_rwsem); 1881 mutex_init(&priv->mcast_mutex); 1882 1883 INIT_LIST_HEAD(&priv->path_list); 1884 INIT_LIST_HEAD(&priv->child_intfs); 1885 INIT_LIST_HEAD(&priv->dead_ahs); 1886 INIT_LIST_HEAD(&priv->multicast_list); 1887 1888 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); 1889 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task); 1890 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light); 1891 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal); 1892 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy); 1893 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); 1894 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); 1895 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh); 1896 } 1897 1898 static const struct net_device_ops ipoib_netdev_default_pf = { 1899 .ndo_init = ipoib_dev_init_default, 1900 .ndo_uninit = ipoib_dev_uninit_default, 1901 .ndo_open = ipoib_ib_dev_open_default, 1902 .ndo_stop = ipoib_ib_dev_stop_default, 1903 }; 1904 1905 static struct net_device 1906 *ipoib_create_netdev_default(struct ib_device *hca, 1907 const char *name, 1908 unsigned char name_assign_type, 1909 void (*setup)(struct net_device *)) 1910 { 1911 struct net_device *dev; 1912 struct rdma_netdev *rn; 1913 1914 dev = alloc_netdev((int)sizeof(struct rdma_netdev), 1915 name, 1916 name_assign_type, setup); 1917 if (!dev) 1918 return NULL; 1919 1920 rn = netdev_priv(dev); 1921 1922 rn->send = ipoib_send; 1923 rn->attach_mcast = ipoib_mcast_attach; 1924 rn->detach_mcast = ipoib_mcast_detach; 1925 rn->free_rdma_netdev = free_netdev; 1926 rn->hca = hca; 1927 1928 dev->netdev_ops = &ipoib_netdev_default_pf; 1929 1930 return dev; 1931 } 1932 1933 static struct net_device *ipoib_get_netdev(struct ib_device *hca, u8 port, 1934 const char *name) 1935 { 1936 struct net_device *dev; 1937 1938 if (hca->alloc_rdma_netdev) { 1939 dev = hca->alloc_rdma_netdev(hca, port, 1940 RDMA_NETDEV_IPOIB, name, 1941 NET_NAME_UNKNOWN, 1942 ipoib_setup_common); 1943 if (IS_ERR_OR_NULL(dev) && PTR_ERR(dev) != -EOPNOTSUPP) 1944 return NULL; 1945 } 1946 1947 if (!hca->alloc_rdma_netdev || PTR_ERR(dev) == -EOPNOTSUPP) 1948 dev = ipoib_create_netdev_default(hca, name, NET_NAME_UNKNOWN, 1949 ipoib_setup_common); 1950 1951 return dev; 1952 } 1953 1954 struct ipoib_dev_priv *ipoib_intf_alloc(struct ib_device *hca, u8 port, 1955 const char *name) 1956 { 1957 struct net_device *dev; 1958 struct ipoib_dev_priv *priv; 1959 struct rdma_netdev *rn; 1960 1961 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 1962 if (!priv) 1963 return NULL; 1964 1965 dev = ipoib_get_netdev(hca, port, name); 1966 if (!dev) 1967 goto free_priv; 1968 1969 priv->rn_ops = dev->netdev_ops; 1970 1971 /* fixme : should be after the query_cap */ 1972 if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION) 1973 dev->netdev_ops = &ipoib_netdev_ops_vf; 1974 else 1975 dev->netdev_ops = &ipoib_netdev_ops_pf; 1976 1977 rn = netdev_priv(dev); 1978 rn->clnt_priv = priv; 1979 ipoib_build_priv(dev); 1980 1981 return priv; 1982 free_priv: 1983 kfree(priv); 1984 return NULL; 1985 } 1986 1987 static ssize_t show_pkey(struct device *dev, 1988 struct device_attribute *attr, char *buf) 1989 { 1990 struct net_device *ndev = to_net_dev(dev); 1991 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 1992 1993 return sprintf(buf, "0x%04x\n", priv->pkey); 1994 } 1995 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 1996 1997 static ssize_t show_umcast(struct device *dev, 1998 struct device_attribute *attr, char *buf) 1999 { 2000 struct net_device *ndev = to_net_dev(dev); 2001 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2002 2003 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); 2004 } 2005 2006 void ipoib_set_umcast(struct net_device *ndev, int umcast_val) 2007 { 2008 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2009 2010 if (umcast_val > 0) { 2011 set_bit(IPOIB_FLAG_UMCAST, &priv->flags); 2012 ipoib_warn(priv, "ignoring multicast groups joined directly " 2013 "by userspace\n"); 2014 } else 2015 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); 2016 } 2017 2018 static ssize_t set_umcast(struct device *dev, 2019 struct device_attribute *attr, 2020 const char *buf, size_t count) 2021 { 2022 unsigned long umcast_val = simple_strtoul(buf, NULL, 0); 2023 2024 ipoib_set_umcast(to_net_dev(dev), umcast_val); 2025 2026 return count; 2027 } 2028 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); 2029 2030 int ipoib_add_umcast_attr(struct net_device *dev) 2031 { 2032 return device_create_file(&dev->dev, &dev_attr_umcast); 2033 } 2034 2035 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid) 2036 { 2037 struct ipoib_dev_priv *child_priv; 2038 struct net_device *netdev = priv->dev; 2039 2040 netif_addr_lock_bh(netdev); 2041 2042 memcpy(&priv->local_gid.global.interface_id, 2043 &gid->global.interface_id, 2044 sizeof(gid->global.interface_id)); 2045 memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid)); 2046 clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 2047 2048 netif_addr_unlock_bh(netdev); 2049 2050 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 2051 down_read(&priv->vlan_rwsem); 2052 list_for_each_entry(child_priv, &priv->child_intfs, list) 2053 set_base_guid(child_priv, gid); 2054 up_read(&priv->vlan_rwsem); 2055 } 2056 } 2057 2058 static int ipoib_check_lladdr(struct net_device *dev, 2059 struct sockaddr_storage *ss) 2060 { 2061 union ib_gid *gid = (union ib_gid *)(ss->__data + 4); 2062 int ret = 0; 2063 2064 netif_addr_lock_bh(dev); 2065 2066 /* Make sure the QPN, reserved and subnet prefix match the current 2067 * lladdr, it also makes sure the lladdr is unicast. 2068 */ 2069 if (memcmp(dev->dev_addr, ss->__data, 2070 4 + sizeof(gid->global.subnet_prefix)) || 2071 gid->global.interface_id == 0) 2072 ret = -EINVAL; 2073 2074 netif_addr_unlock_bh(dev); 2075 2076 return ret; 2077 } 2078 2079 static int ipoib_set_mac(struct net_device *dev, void *addr) 2080 { 2081 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2082 struct sockaddr_storage *ss = addr; 2083 int ret; 2084 2085 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) 2086 return -EBUSY; 2087 2088 ret = ipoib_check_lladdr(dev, ss); 2089 if (ret) 2090 return ret; 2091 2092 set_base_guid(priv, (union ib_gid *)(ss->__data + 4)); 2093 2094 queue_work(ipoib_workqueue, &priv->flush_light); 2095 2096 return 0; 2097 } 2098 2099 static ssize_t create_child(struct device *dev, 2100 struct device_attribute *attr, 2101 const char *buf, size_t count) 2102 { 2103 int pkey; 2104 int ret; 2105 2106 if (sscanf(buf, "%i", &pkey) != 1) 2107 return -EINVAL; 2108 2109 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000) 2110 return -EINVAL; 2111 2112 /* 2113 * Set the full membership bit, so that we join the right 2114 * broadcast group, etc. 2115 */ 2116 pkey |= 0x8000; 2117 2118 ret = ipoib_vlan_add(to_net_dev(dev), pkey); 2119 2120 return ret ? ret : count; 2121 } 2122 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child); 2123 2124 static ssize_t delete_child(struct device *dev, 2125 struct device_attribute *attr, 2126 const char *buf, size_t count) 2127 { 2128 int pkey; 2129 int ret; 2130 2131 if (sscanf(buf, "%i", &pkey) != 1) 2132 return -EINVAL; 2133 2134 if (pkey < 0 || pkey > 0xffff) 2135 return -EINVAL; 2136 2137 ret = ipoib_vlan_delete(to_net_dev(dev), pkey); 2138 2139 return ret ? ret : count; 2140 2141 } 2142 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child); 2143 2144 int ipoib_add_pkey_attr(struct net_device *dev) 2145 { 2146 return device_create_file(&dev->dev, &dev_attr_pkey); 2147 } 2148 2149 void ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca) 2150 { 2151 priv->hca_caps = hca->attrs.device_cap_flags; 2152 2153 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { 2154 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM; 2155 2156 if (priv->hca_caps & IB_DEVICE_UD_TSO) 2157 priv->dev->hw_features |= NETIF_F_TSO; 2158 2159 priv->dev->features |= priv->dev->hw_features; 2160 } 2161 } 2162 2163 static struct net_device *ipoib_add_port(const char *format, 2164 struct ib_device *hca, u8 port) 2165 { 2166 struct ipoib_dev_priv *priv; 2167 struct ib_port_attr attr; 2168 int result = -ENOMEM; 2169 2170 priv = ipoib_intf_alloc(hca, port, format); 2171 if (!priv) 2172 goto alloc_mem_failed; 2173 2174 SET_NETDEV_DEV(priv->dev, hca->dev.parent); 2175 priv->dev->dev_id = port - 1; 2176 2177 result = ib_query_port(hca, port, &attr); 2178 if (result) { 2179 printk(KERN_WARNING "%s: ib_query_port %d failed\n", 2180 hca->name, port); 2181 goto device_init_failed; 2182 } 2183 2184 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu); 2185 2186 /* MTU will be reset when mcast join happens */ 2187 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); 2188 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu; 2189 priv->dev->max_mtu = IPOIB_CM_MTU; 2190 2191 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh); 2192 2193 result = ib_query_pkey(hca, port, 0, &priv->pkey); 2194 if (result) { 2195 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n", 2196 hca->name, port, result); 2197 goto device_init_failed; 2198 } 2199 2200 ipoib_set_dev_features(priv, hca); 2201 2202 /* 2203 * Set the full membership bit, so that we join the right 2204 * broadcast group, etc. 2205 */ 2206 priv->pkey |= 0x8000; 2207 2208 priv->dev->broadcast[8] = priv->pkey >> 8; 2209 priv->dev->broadcast[9] = priv->pkey & 0xff; 2210 2211 result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL); 2212 if (result) { 2213 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n", 2214 hca->name, port, result); 2215 goto device_init_failed; 2216 } 2217 2218 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, 2219 sizeof(union ib_gid)); 2220 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 2221 2222 result = ipoib_dev_init(priv->dev, hca, port); 2223 if (result) { 2224 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n", 2225 hca->name, port, result); 2226 goto device_init_failed; 2227 } 2228 2229 INIT_IB_EVENT_HANDLER(&priv->event_handler, 2230 priv->ca, ipoib_event); 2231 result = ib_register_event_handler(&priv->event_handler); 2232 if (result < 0) { 2233 printk(KERN_WARNING "%s: ib_register_event_handler failed for " 2234 "port %d (ret = %d)\n", 2235 hca->name, port, result); 2236 goto event_failed; 2237 } 2238 2239 result = register_netdev(priv->dev); 2240 if (result) { 2241 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n", 2242 hca->name, port, result); 2243 goto register_failed; 2244 } 2245 2246 result = -ENOMEM; 2247 if (ipoib_cm_add_mode_attr(priv->dev)) 2248 goto sysfs_failed; 2249 if (ipoib_add_pkey_attr(priv->dev)) 2250 goto sysfs_failed; 2251 if (ipoib_add_umcast_attr(priv->dev)) 2252 goto sysfs_failed; 2253 if (device_create_file(&priv->dev->dev, &dev_attr_create_child)) 2254 goto sysfs_failed; 2255 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child)) 2256 goto sysfs_failed; 2257 2258 return priv->dev; 2259 2260 sysfs_failed: 2261 unregister_netdev(priv->dev); 2262 2263 register_failed: 2264 ib_unregister_event_handler(&priv->event_handler); 2265 flush_workqueue(ipoib_workqueue); 2266 /* Stop GC if started before flush */ 2267 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 2268 cancel_delayed_work(&priv->neigh_reap_task); 2269 flush_workqueue(priv->wq); 2270 2271 event_failed: 2272 ipoib_dev_cleanup(priv->dev); 2273 2274 device_init_failed: 2275 free_netdev(priv->dev); 2276 kfree(priv); 2277 2278 alloc_mem_failed: 2279 return ERR_PTR(result); 2280 } 2281 2282 static void ipoib_add_one(struct ib_device *device) 2283 { 2284 struct list_head *dev_list; 2285 struct net_device *dev; 2286 struct ipoib_dev_priv *priv; 2287 int p; 2288 int count = 0; 2289 2290 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL); 2291 if (!dev_list) 2292 return; 2293 2294 INIT_LIST_HEAD(dev_list); 2295 2296 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) { 2297 if (!rdma_protocol_ib(device, p)) 2298 continue; 2299 dev = ipoib_add_port("ib%d", device, p); 2300 if (!IS_ERR(dev)) { 2301 priv = ipoib_priv(dev); 2302 list_add_tail(&priv->list, dev_list); 2303 count++; 2304 } 2305 } 2306 2307 if (!count) { 2308 kfree(dev_list); 2309 return; 2310 } 2311 2312 ib_set_client_data(device, &ipoib_client, dev_list); 2313 } 2314 2315 static void ipoib_remove_one(struct ib_device *device, void *client_data) 2316 { 2317 struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv; 2318 struct list_head *dev_list = client_data; 2319 2320 if (!dev_list) 2321 return; 2322 2323 list_for_each_entry_safe(priv, tmp, dev_list, list) { 2324 struct rdma_netdev *rn = netdev_priv(priv->dev); 2325 2326 ib_unregister_event_handler(&priv->event_handler); 2327 flush_workqueue(ipoib_workqueue); 2328 2329 /* mark interface in the middle of destruction */ 2330 set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags); 2331 2332 rtnl_lock(); 2333 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP); 2334 rtnl_unlock(); 2335 2336 /* Stop GC */ 2337 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 2338 cancel_delayed_work(&priv->neigh_reap_task); 2339 flush_workqueue(priv->wq); 2340 2341 unregister_netdev(priv->dev); 2342 rn->free_rdma_netdev(priv->dev); 2343 2344 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) 2345 kfree(cpriv); 2346 2347 kfree(priv); 2348 } 2349 2350 kfree(dev_list); 2351 } 2352 2353 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2354 static struct notifier_block ipoib_netdev_notifier = { 2355 .notifier_call = ipoib_netdev_event, 2356 }; 2357 #endif 2358 2359 static int __init ipoib_init_module(void) 2360 { 2361 int ret; 2362 2363 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); 2364 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); 2365 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); 2366 2367 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); 2368 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); 2369 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE); 2370 #ifdef CONFIG_INFINIBAND_IPOIB_CM 2371 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); 2372 ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0); 2373 #endif 2374 2375 /* 2376 * When copying small received packets, we only copy from the 2377 * linear data part of the SKB, so we rely on this condition. 2378 */ 2379 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE); 2380 2381 ret = ipoib_register_debugfs(); 2382 if (ret) 2383 return ret; 2384 2385 /* 2386 * We create a global workqueue here that is used for all flush 2387 * operations. However, if you attempt to flush a workqueue 2388 * from a task on that same workqueue, it deadlocks the system. 2389 * We want to be able to flush the tasks associated with a 2390 * specific net device, so we also create a workqueue for each 2391 * netdevice. We queue up the tasks for that device only on 2392 * its private workqueue, and we only queue up flush events 2393 * on our global flush workqueue. This avoids the deadlocks. 2394 */ 2395 ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 2396 WQ_MEM_RECLAIM); 2397 if (!ipoib_workqueue) { 2398 ret = -ENOMEM; 2399 goto err_fs; 2400 } 2401 2402 ib_sa_register_client(&ipoib_sa_client); 2403 2404 ret = ib_register_client(&ipoib_client); 2405 if (ret) 2406 goto err_sa; 2407 2408 ret = ipoib_netlink_init(); 2409 if (ret) 2410 goto err_client; 2411 2412 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2413 register_netdevice_notifier(&ipoib_netdev_notifier); 2414 #endif 2415 return 0; 2416 2417 err_client: 2418 ib_unregister_client(&ipoib_client); 2419 2420 err_sa: 2421 ib_sa_unregister_client(&ipoib_sa_client); 2422 destroy_workqueue(ipoib_workqueue); 2423 2424 err_fs: 2425 ipoib_unregister_debugfs(); 2426 2427 return ret; 2428 } 2429 2430 static void __exit ipoib_cleanup_module(void) 2431 { 2432 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2433 unregister_netdevice_notifier(&ipoib_netdev_notifier); 2434 #endif 2435 ipoib_netlink_fini(); 2436 ib_unregister_client(&ipoib_client); 2437 ib_sa_unregister_client(&ipoib_sa_client); 2438 ipoib_unregister_debugfs(); 2439 destroy_workqueue(ipoib_workqueue); 2440 } 2441 2442 module_init(ipoib_init_module); 2443 module_exit(ipoib_cleanup_module); 2444