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 int ipoib_open(struct net_device *dev) 112 { 113 struct ipoib_dev_priv *priv = netdev_priv(dev); 114 115 ipoib_dbg(priv, "bringing up interface\n"); 116 117 netif_carrier_off(dev); 118 119 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 120 121 priv->sm_fullmember_sendonly_support = false; 122 123 if (ipoib_ib_dev_open(dev)) { 124 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 125 return 0; 126 goto err_disable; 127 } 128 129 if (ipoib_ib_dev_up(dev)) 130 goto err_stop; 131 132 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 133 struct ipoib_dev_priv *cpriv; 134 135 /* Bring up any child interfaces too */ 136 down_read(&priv->vlan_rwsem); 137 list_for_each_entry(cpriv, &priv->child_intfs, list) { 138 int flags; 139 140 flags = cpriv->dev->flags; 141 if (flags & IFF_UP) 142 continue; 143 144 dev_change_flags(cpriv->dev, flags | IFF_UP); 145 } 146 up_read(&priv->vlan_rwsem); 147 } 148 149 netif_start_queue(dev); 150 151 return 0; 152 153 err_stop: 154 ipoib_ib_dev_stop(dev); 155 156 err_disable: 157 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 158 159 return -EINVAL; 160 } 161 162 static int ipoib_stop(struct net_device *dev) 163 { 164 struct ipoib_dev_priv *priv = netdev_priv(dev); 165 166 ipoib_dbg(priv, "stopping interface\n"); 167 168 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 169 170 netif_stop_queue(dev); 171 172 ipoib_ib_dev_down(dev); 173 ipoib_ib_dev_stop(dev); 174 175 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 176 struct ipoib_dev_priv *cpriv; 177 178 /* Bring down any child interfaces too */ 179 down_read(&priv->vlan_rwsem); 180 list_for_each_entry(cpriv, &priv->child_intfs, list) { 181 int flags; 182 183 flags = cpriv->dev->flags; 184 if (!(flags & IFF_UP)) 185 continue; 186 187 dev_change_flags(cpriv->dev, flags & ~IFF_UP); 188 } 189 up_read(&priv->vlan_rwsem); 190 } 191 192 return 0; 193 } 194 195 static void ipoib_uninit(struct net_device *dev) 196 { 197 ipoib_dev_cleanup(dev); 198 } 199 200 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features) 201 { 202 struct ipoib_dev_priv *priv = netdev_priv(dev); 203 204 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 205 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO); 206 207 return features; 208 } 209 210 static int ipoib_change_mtu(struct net_device *dev, int new_mtu) 211 { 212 struct ipoib_dev_priv *priv = netdev_priv(dev); 213 214 /* dev->mtu > 2K ==> connected mode */ 215 if (ipoib_cm_admin_enabled(dev)) { 216 if (new_mtu > ipoib_cm_max_mtu(dev)) 217 return -EINVAL; 218 219 if (new_mtu > priv->mcast_mtu) 220 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n", 221 priv->mcast_mtu); 222 223 dev->mtu = new_mtu; 224 return 0; 225 } 226 227 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) 228 return -EINVAL; 229 230 priv->admin_mtu = new_mtu; 231 232 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu); 233 234 return 0; 235 } 236 237 /* Called with an RCU read lock taken */ 238 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr, 239 struct net_device *dev) 240 { 241 struct net *net = dev_net(dev); 242 struct in_device *in_dev; 243 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr; 244 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr; 245 __be32 ret_addr; 246 247 switch (addr->sa_family) { 248 case AF_INET: 249 in_dev = in_dev_get(dev); 250 if (!in_dev) 251 return false; 252 253 ret_addr = inet_confirm_addr(net, in_dev, 0, 254 addr_in->sin_addr.s_addr, 255 RT_SCOPE_HOST); 256 in_dev_put(in_dev); 257 if (ret_addr) 258 return true; 259 260 break; 261 case AF_INET6: 262 if (IS_ENABLED(CONFIG_IPV6) && 263 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1)) 264 return true; 265 266 break; 267 } 268 return false; 269 } 270 271 /** 272 * Find the master net_device on top of the given net_device. 273 * @dev: base IPoIB net_device 274 * 275 * Returns the master net_device with a reference held, or the same net_device 276 * if no master exists. 277 */ 278 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev) 279 { 280 struct net_device *master; 281 282 rcu_read_lock(); 283 master = netdev_master_upper_dev_get_rcu(dev); 284 if (master) 285 dev_hold(master); 286 rcu_read_unlock(); 287 288 if (master) 289 return master; 290 291 dev_hold(dev); 292 return dev; 293 } 294 295 struct ipoib_walk_data { 296 const struct sockaddr *addr; 297 struct net_device *result; 298 }; 299 300 static int ipoib_upper_walk(struct net_device *upper, void *_data) 301 { 302 struct ipoib_walk_data *data = _data; 303 int ret = 0; 304 305 if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) { 306 dev_hold(upper); 307 data->result = upper; 308 ret = 1; 309 } 310 311 return ret; 312 } 313 314 /** 315 * Find a net_device matching the given address, which is an upper device of 316 * the given net_device. 317 * @addr: IP address to look for. 318 * @dev: base IPoIB net_device 319 * 320 * If found, returns the net_device with a reference held. Otherwise return 321 * NULL. 322 */ 323 static struct net_device *ipoib_get_net_dev_match_addr( 324 const struct sockaddr *addr, struct net_device *dev) 325 { 326 struct ipoib_walk_data data = { 327 .addr = addr, 328 }; 329 330 rcu_read_lock(); 331 if (ipoib_is_dev_match_addr_rcu(addr, dev)) { 332 dev_hold(dev); 333 data.result = dev; 334 goto out; 335 } 336 337 netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data); 338 out: 339 rcu_read_unlock(); 340 return data.result; 341 } 342 343 /* returns the number of IPoIB netdevs on top a given ipoib device matching a 344 * pkey_index and address, if one exists. 345 * 346 * @found_net_dev: contains a matching net_device if the return value >= 1, 347 * with a reference held. */ 348 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv, 349 const union ib_gid *gid, 350 u16 pkey_index, 351 const struct sockaddr *addr, 352 int nesting, 353 struct net_device **found_net_dev) 354 { 355 struct ipoib_dev_priv *child_priv; 356 struct net_device *net_dev = NULL; 357 int matches = 0; 358 359 if (priv->pkey_index == pkey_index && 360 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) { 361 if (!addr) { 362 net_dev = ipoib_get_master_net_dev(priv->dev); 363 } else { 364 /* Verify the net_device matches the IP address, as 365 * IPoIB child devices currently share a GID. */ 366 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev); 367 } 368 if (net_dev) { 369 if (!*found_net_dev) 370 *found_net_dev = net_dev; 371 else 372 dev_put(net_dev); 373 ++matches; 374 } 375 } 376 377 /* Check child interfaces */ 378 down_read_nested(&priv->vlan_rwsem, nesting); 379 list_for_each_entry(child_priv, &priv->child_intfs, list) { 380 matches += ipoib_match_gid_pkey_addr(child_priv, gid, 381 pkey_index, addr, 382 nesting + 1, 383 found_net_dev); 384 if (matches > 1) 385 break; 386 } 387 up_read(&priv->vlan_rwsem); 388 389 return matches; 390 } 391 392 /* Returns the number of matching net_devs found (between 0 and 2). Also 393 * return the matching net_device in the @net_dev parameter, holding a 394 * reference to the net_device, if the number of matches >= 1 */ 395 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port, 396 u16 pkey_index, 397 const union ib_gid *gid, 398 const struct sockaddr *addr, 399 struct net_device **net_dev) 400 { 401 struct ipoib_dev_priv *priv; 402 int matches = 0; 403 404 *net_dev = NULL; 405 406 list_for_each_entry(priv, dev_list, list) { 407 if (priv->port != port) 408 continue; 409 410 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index, 411 addr, 0, net_dev); 412 if (matches > 1) 413 break; 414 } 415 416 return matches; 417 } 418 419 static struct net_device *ipoib_get_net_dev_by_params( 420 struct ib_device *dev, u8 port, u16 pkey, 421 const union ib_gid *gid, const struct sockaddr *addr, 422 void *client_data) 423 { 424 struct net_device *net_dev; 425 struct list_head *dev_list = client_data; 426 u16 pkey_index; 427 int matches; 428 int ret; 429 430 if (!rdma_protocol_ib(dev, port)) 431 return NULL; 432 433 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index); 434 if (ret) 435 return NULL; 436 437 if (!dev_list) 438 return NULL; 439 440 /* See if we can find a unique device matching the L2 parameters */ 441 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, 442 gid, NULL, &net_dev); 443 444 switch (matches) { 445 case 0: 446 return NULL; 447 case 1: 448 return net_dev; 449 } 450 451 dev_put(net_dev); 452 453 /* Couldn't find a unique device with L2 parameters only. Use L3 454 * address to uniquely match the net device */ 455 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, 456 gid, addr, &net_dev); 457 switch (matches) { 458 case 0: 459 return NULL; 460 default: 461 dev_warn_ratelimited(&dev->dev, 462 "duplicate IP address detected\n"); 463 /* Fall through */ 464 case 1: 465 return net_dev; 466 } 467 } 468 469 int ipoib_set_mode(struct net_device *dev, const char *buf) 470 { 471 struct ipoib_dev_priv *priv = netdev_priv(dev); 472 473 /* flush paths if we switch modes so that connections are restarted */ 474 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 475 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 476 ipoib_warn(priv, "enabling connected mode " 477 "will cause multicast packet drops\n"); 478 netdev_update_features(dev); 479 dev_set_mtu(dev, ipoib_cm_max_mtu(dev)); 480 rtnl_unlock(); 481 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM; 482 483 ipoib_flush_paths(dev); 484 rtnl_lock(); 485 return 0; 486 } 487 488 if (!strcmp(buf, "datagram\n")) { 489 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 490 netdev_update_features(dev); 491 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu)); 492 rtnl_unlock(); 493 ipoib_flush_paths(dev); 494 rtnl_lock(); 495 return 0; 496 } 497 498 return -EINVAL; 499 } 500 501 struct ipoib_path *__path_find(struct net_device *dev, void *gid) 502 { 503 struct ipoib_dev_priv *priv = netdev_priv(dev); 504 struct rb_node *n = priv->path_tree.rb_node; 505 struct ipoib_path *path; 506 int ret; 507 508 while (n) { 509 path = rb_entry(n, struct ipoib_path, rb_node); 510 511 ret = memcmp(gid, path->pathrec.dgid.raw, 512 sizeof (union ib_gid)); 513 514 if (ret < 0) 515 n = n->rb_left; 516 else if (ret > 0) 517 n = n->rb_right; 518 else 519 return path; 520 } 521 522 return NULL; 523 } 524 525 static int __path_add(struct net_device *dev, struct ipoib_path *path) 526 { 527 struct ipoib_dev_priv *priv = netdev_priv(dev); 528 struct rb_node **n = &priv->path_tree.rb_node; 529 struct rb_node *pn = NULL; 530 struct ipoib_path *tpath; 531 int ret; 532 533 while (*n) { 534 pn = *n; 535 tpath = rb_entry(pn, struct ipoib_path, rb_node); 536 537 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw, 538 sizeof (union ib_gid)); 539 if (ret < 0) 540 n = &pn->rb_left; 541 else if (ret > 0) 542 n = &pn->rb_right; 543 else 544 return -EEXIST; 545 } 546 547 rb_link_node(&path->rb_node, pn, n); 548 rb_insert_color(&path->rb_node, &priv->path_tree); 549 550 list_add_tail(&path->list, &priv->path_list); 551 552 return 0; 553 } 554 555 static void path_free(struct net_device *dev, struct ipoib_path *path) 556 { 557 struct sk_buff *skb; 558 559 while ((skb = __skb_dequeue(&path->queue))) 560 dev_kfree_skb_irq(skb); 561 562 ipoib_dbg(netdev_priv(dev), "path_free\n"); 563 564 /* remove all neigh connected to this path */ 565 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 566 567 if (path->ah) 568 ipoib_put_ah(path->ah); 569 570 kfree(path); 571 } 572 573 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 574 575 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev) 576 { 577 struct ipoib_path_iter *iter; 578 579 iter = kmalloc(sizeof *iter, GFP_KERNEL); 580 if (!iter) 581 return NULL; 582 583 iter->dev = dev; 584 memset(iter->path.pathrec.dgid.raw, 0, 16); 585 586 if (ipoib_path_iter_next(iter)) { 587 kfree(iter); 588 return NULL; 589 } 590 591 return iter; 592 } 593 594 int ipoib_path_iter_next(struct ipoib_path_iter *iter) 595 { 596 struct ipoib_dev_priv *priv = netdev_priv(iter->dev); 597 struct rb_node *n; 598 struct ipoib_path *path; 599 int ret = 1; 600 601 spin_lock_irq(&priv->lock); 602 603 n = rb_first(&priv->path_tree); 604 605 while (n) { 606 path = rb_entry(n, struct ipoib_path, rb_node); 607 608 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw, 609 sizeof (union ib_gid)) < 0) { 610 iter->path = *path; 611 ret = 0; 612 break; 613 } 614 615 n = rb_next(n); 616 } 617 618 spin_unlock_irq(&priv->lock); 619 620 return ret; 621 } 622 623 void ipoib_path_iter_read(struct ipoib_path_iter *iter, 624 struct ipoib_path *path) 625 { 626 *path = iter->path; 627 } 628 629 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 630 631 void ipoib_mark_paths_invalid(struct net_device *dev) 632 { 633 struct ipoib_dev_priv *priv = netdev_priv(dev); 634 struct ipoib_path *path, *tp; 635 636 spin_lock_irq(&priv->lock); 637 638 list_for_each_entry_safe(path, tp, &priv->path_list, list) { 639 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n", 640 be16_to_cpu(path->pathrec.dlid), 641 path->pathrec.dgid.raw); 642 path->valid = 0; 643 } 644 645 spin_unlock_irq(&priv->lock); 646 } 647 648 struct classport_info_context { 649 struct ipoib_dev_priv *priv; 650 struct completion done; 651 struct ib_sa_query *sa_query; 652 }; 653 654 static void classport_info_query_cb(int status, struct ib_class_port_info *rec, 655 void *context) 656 { 657 struct classport_info_context *cb_ctx = context; 658 struct ipoib_dev_priv *priv; 659 660 WARN_ON(!context); 661 662 priv = cb_ctx->priv; 663 664 if (status || !rec) { 665 pr_debug("device: %s failed query classport_info status: %d\n", 666 priv->dev->name, status); 667 /* keeps the default, will try next mcast_restart */ 668 priv->sm_fullmember_sendonly_support = false; 669 goto out; 670 } 671 672 if (ib_get_cpi_capmask2(rec) & 673 IB_SA_CAP_MASK2_SENDONLY_FULL_MEM_SUPPORT) { 674 pr_debug("device: %s enabled fullmember-sendonly for sendonly MCG\n", 675 priv->dev->name); 676 priv->sm_fullmember_sendonly_support = true; 677 } else { 678 pr_debug("device: %s disabled fullmember-sendonly for sendonly MCG\n", 679 priv->dev->name); 680 priv->sm_fullmember_sendonly_support = false; 681 } 682 683 out: 684 complete(&cb_ctx->done); 685 } 686 687 int ipoib_check_sm_sendonly_fullmember_support(struct ipoib_dev_priv *priv) 688 { 689 struct classport_info_context *callback_context; 690 int ret; 691 692 callback_context = kmalloc(sizeof(*callback_context), GFP_KERNEL); 693 if (!callback_context) 694 return -ENOMEM; 695 696 callback_context->priv = priv; 697 init_completion(&callback_context->done); 698 699 ret = ib_sa_classport_info_rec_query(&ipoib_sa_client, 700 priv->ca, priv->port, 3000, 701 GFP_KERNEL, 702 classport_info_query_cb, 703 callback_context, 704 &callback_context->sa_query); 705 if (ret < 0) { 706 pr_info("%s failed to send ib_sa_classport_info query, ret: %d\n", 707 priv->dev->name, ret); 708 kfree(callback_context); 709 return ret; 710 } 711 712 /* waiting for the callback to finish before returnning */ 713 wait_for_completion(&callback_context->done); 714 kfree(callback_context); 715 716 return ret; 717 } 718 719 void ipoib_flush_paths(struct net_device *dev) 720 { 721 struct ipoib_dev_priv *priv = netdev_priv(dev); 722 struct ipoib_path *path, *tp; 723 LIST_HEAD(remove_list); 724 unsigned long flags; 725 726 netif_tx_lock_bh(dev); 727 spin_lock_irqsave(&priv->lock, flags); 728 729 list_splice_init(&priv->path_list, &remove_list); 730 731 list_for_each_entry(path, &remove_list, list) 732 rb_erase(&path->rb_node, &priv->path_tree); 733 734 list_for_each_entry_safe(path, tp, &remove_list, list) { 735 if (path->query) 736 ib_sa_cancel_query(path->query_id, path->query); 737 spin_unlock_irqrestore(&priv->lock, flags); 738 netif_tx_unlock_bh(dev); 739 wait_for_completion(&path->done); 740 path_free(dev, path); 741 netif_tx_lock_bh(dev); 742 spin_lock_irqsave(&priv->lock, flags); 743 } 744 745 spin_unlock_irqrestore(&priv->lock, flags); 746 netif_tx_unlock_bh(dev); 747 } 748 749 static void path_rec_completion(int status, 750 struct ib_sa_path_rec *pathrec, 751 void *path_ptr) 752 { 753 struct ipoib_path *path = path_ptr; 754 struct net_device *dev = path->dev; 755 struct ipoib_dev_priv *priv = netdev_priv(dev); 756 struct ipoib_ah *ah = NULL; 757 struct ipoib_ah *old_ah = NULL; 758 struct ipoib_neigh *neigh, *tn; 759 struct sk_buff_head skqueue; 760 struct sk_buff *skb; 761 unsigned long flags; 762 763 if (!status) 764 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n", 765 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw); 766 else 767 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n", 768 status, path->pathrec.dgid.raw); 769 770 skb_queue_head_init(&skqueue); 771 772 if (!status) { 773 struct ib_ah_attr av; 774 775 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av)) 776 ah = ipoib_create_ah(dev, priv->pd, &av); 777 } 778 779 spin_lock_irqsave(&priv->lock, flags); 780 781 if (!IS_ERR_OR_NULL(ah)) { 782 path->pathrec = *pathrec; 783 784 old_ah = path->ah; 785 path->ah = ah; 786 787 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n", 788 ah, be16_to_cpu(pathrec->dlid), pathrec->sl); 789 790 while ((skb = __skb_dequeue(&path->queue))) 791 __skb_queue_tail(&skqueue, skb); 792 793 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { 794 if (neigh->ah) { 795 WARN_ON(neigh->ah != old_ah); 796 /* 797 * Dropping the ah reference inside 798 * priv->lock is safe here, because we 799 * will hold one more reference from 800 * the original value of path->ah (ie 801 * old_ah). 802 */ 803 ipoib_put_ah(neigh->ah); 804 } 805 kref_get(&path->ah->ref); 806 neigh->ah = path->ah; 807 808 if (ipoib_cm_enabled(dev, neigh->daddr)) { 809 if (!ipoib_cm_get(neigh)) 810 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, 811 path, 812 neigh)); 813 if (!ipoib_cm_get(neigh)) { 814 ipoib_neigh_free(neigh); 815 continue; 816 } 817 } 818 819 while ((skb = __skb_dequeue(&neigh->queue))) 820 __skb_queue_tail(&skqueue, skb); 821 } 822 path->valid = 1; 823 } 824 825 path->query = NULL; 826 complete(&path->done); 827 828 spin_unlock_irqrestore(&priv->lock, flags); 829 830 if (IS_ERR_OR_NULL(ah)) 831 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 832 833 if (old_ah) 834 ipoib_put_ah(old_ah); 835 836 while ((skb = __skb_dequeue(&skqueue))) { 837 skb->dev = dev; 838 if (dev_queue_xmit(skb)) 839 ipoib_warn(priv, "dev_queue_xmit failed " 840 "to requeue packet\n"); 841 } 842 } 843 844 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid) 845 { 846 struct ipoib_dev_priv *priv = netdev_priv(dev); 847 struct ipoib_path *path; 848 849 if (!priv->broadcast) 850 return NULL; 851 852 path = kzalloc(sizeof *path, GFP_ATOMIC); 853 if (!path) 854 return NULL; 855 856 path->dev = dev; 857 858 skb_queue_head_init(&path->queue); 859 860 INIT_LIST_HEAD(&path->neigh_list); 861 862 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid)); 863 path->pathrec.sgid = priv->local_gid; 864 path->pathrec.pkey = cpu_to_be16(priv->pkey); 865 path->pathrec.numb_path = 1; 866 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class; 867 868 return path; 869 } 870 871 static int path_rec_start(struct net_device *dev, 872 struct ipoib_path *path) 873 { 874 struct ipoib_dev_priv *priv = netdev_priv(dev); 875 876 ipoib_dbg(priv, "Start path record lookup for %pI6\n", 877 path->pathrec.dgid.raw); 878 879 init_completion(&path->done); 880 881 path->query_id = 882 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port, 883 &path->pathrec, 884 IB_SA_PATH_REC_DGID | 885 IB_SA_PATH_REC_SGID | 886 IB_SA_PATH_REC_NUMB_PATH | 887 IB_SA_PATH_REC_TRAFFIC_CLASS | 888 IB_SA_PATH_REC_PKEY, 889 1000, GFP_ATOMIC, 890 path_rec_completion, 891 path, &path->query); 892 if (path->query_id < 0) { 893 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id); 894 path->query = NULL; 895 complete(&path->done); 896 return path->query_id; 897 } 898 899 return 0; 900 } 901 902 static void neigh_add_path(struct sk_buff *skb, u8 *daddr, 903 struct net_device *dev) 904 { 905 struct ipoib_dev_priv *priv = netdev_priv(dev); 906 struct ipoib_path *path; 907 struct ipoib_neigh *neigh; 908 unsigned long flags; 909 910 spin_lock_irqsave(&priv->lock, flags); 911 neigh = ipoib_neigh_alloc(daddr, dev); 912 if (!neigh) { 913 spin_unlock_irqrestore(&priv->lock, flags); 914 ++dev->stats.tx_dropped; 915 dev_kfree_skb_any(skb); 916 return; 917 } 918 919 path = __path_find(dev, daddr + 4); 920 if (!path) { 921 path = path_rec_create(dev, daddr + 4); 922 if (!path) 923 goto err_path; 924 925 __path_add(dev, path); 926 } 927 928 list_add_tail(&neigh->list, &path->neigh_list); 929 930 if (path->ah) { 931 kref_get(&path->ah->ref); 932 neigh->ah = path->ah; 933 934 if (ipoib_cm_enabled(dev, neigh->daddr)) { 935 if (!ipoib_cm_get(neigh)) 936 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh)); 937 if (!ipoib_cm_get(neigh)) { 938 ipoib_neigh_free(neigh); 939 goto err_drop; 940 } 941 if (skb_queue_len(&neigh->queue) < 942 IPOIB_MAX_PATH_REC_QUEUE) { 943 /* put pseudoheader back on for next time */ 944 skb_push(skb, IPOIB_PSEUDO_LEN); 945 __skb_queue_tail(&neigh->queue, skb); 946 } else { 947 ipoib_warn(priv, "queue length limit %d. Packet drop.\n", 948 skb_queue_len(&neigh->queue)); 949 goto err_drop; 950 } 951 } else { 952 spin_unlock_irqrestore(&priv->lock, flags); 953 ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr)); 954 ipoib_neigh_put(neigh); 955 return; 956 } 957 } else { 958 neigh->ah = NULL; 959 960 if (!path->query && path_rec_start(dev, path)) 961 goto err_path; 962 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) 963 __skb_queue_tail(&neigh->queue, skb); 964 else 965 goto err_drop; 966 } 967 968 spin_unlock_irqrestore(&priv->lock, flags); 969 ipoib_neigh_put(neigh); 970 return; 971 972 err_path: 973 ipoib_neigh_free(neigh); 974 err_drop: 975 ++dev->stats.tx_dropped; 976 dev_kfree_skb_any(skb); 977 978 spin_unlock_irqrestore(&priv->lock, flags); 979 ipoib_neigh_put(neigh); 980 } 981 982 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, 983 struct ipoib_pseudo_header *phdr) 984 { 985 struct ipoib_dev_priv *priv = netdev_priv(dev); 986 struct ipoib_path *path; 987 unsigned long flags; 988 989 spin_lock_irqsave(&priv->lock, flags); 990 991 path = __path_find(dev, phdr->hwaddr + 4); 992 if (!path || !path->valid) { 993 int new_path = 0; 994 995 if (!path) { 996 path = path_rec_create(dev, phdr->hwaddr + 4); 997 new_path = 1; 998 } 999 if (path) { 1000 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1001 /* put pseudoheader back on for next time */ 1002 skb_push(skb, IPOIB_PSEUDO_LEN); 1003 __skb_queue_tail(&path->queue, skb); 1004 } else { 1005 ++dev->stats.tx_dropped; 1006 dev_kfree_skb_any(skb); 1007 } 1008 1009 if (!path->query && path_rec_start(dev, path)) { 1010 spin_unlock_irqrestore(&priv->lock, flags); 1011 if (new_path) 1012 path_free(dev, path); 1013 return; 1014 } else 1015 __path_add(dev, path); 1016 } else { 1017 ++dev->stats.tx_dropped; 1018 dev_kfree_skb_any(skb); 1019 } 1020 1021 spin_unlock_irqrestore(&priv->lock, flags); 1022 return; 1023 } 1024 1025 if (path->ah) { 1026 ipoib_dbg(priv, "Send unicast ARP to %04x\n", 1027 be16_to_cpu(path->pathrec.dlid)); 1028 1029 spin_unlock_irqrestore(&priv->lock, flags); 1030 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr)); 1031 return; 1032 } else if ((path->query || !path_rec_start(dev, path)) && 1033 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1034 /* put pseudoheader back on for next time */ 1035 skb_push(skb, IPOIB_PSEUDO_LEN); 1036 __skb_queue_tail(&path->queue, skb); 1037 } else { 1038 ++dev->stats.tx_dropped; 1039 dev_kfree_skb_any(skb); 1040 } 1041 1042 spin_unlock_irqrestore(&priv->lock, flags); 1043 } 1044 1045 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 1046 { 1047 struct ipoib_dev_priv *priv = netdev_priv(dev); 1048 struct ipoib_neigh *neigh; 1049 struct ipoib_pseudo_header *phdr; 1050 struct ipoib_header *header; 1051 unsigned long flags; 1052 1053 phdr = (struct ipoib_pseudo_header *) skb->data; 1054 skb_pull(skb, sizeof(*phdr)); 1055 header = (struct ipoib_header *) skb->data; 1056 1057 if (unlikely(phdr->hwaddr[4] == 0xff)) { 1058 /* multicast, arrange "if" according to probability */ 1059 if ((header->proto != htons(ETH_P_IP)) && 1060 (header->proto != htons(ETH_P_IPV6)) && 1061 (header->proto != htons(ETH_P_ARP)) && 1062 (header->proto != htons(ETH_P_RARP)) && 1063 (header->proto != htons(ETH_P_TIPC))) { 1064 /* ethertype not supported by IPoIB */ 1065 ++dev->stats.tx_dropped; 1066 dev_kfree_skb_any(skb); 1067 return NETDEV_TX_OK; 1068 } 1069 /* Add in the P_Key for multicast*/ 1070 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff; 1071 phdr->hwaddr[9] = priv->pkey & 0xff; 1072 1073 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1074 if (likely(neigh)) 1075 goto send_using_neigh; 1076 ipoib_mcast_send(dev, phdr->hwaddr, skb); 1077 return NETDEV_TX_OK; 1078 } 1079 1080 /* unicast, arrange "switch" according to probability */ 1081 switch (header->proto) { 1082 case htons(ETH_P_IP): 1083 case htons(ETH_P_IPV6): 1084 case htons(ETH_P_TIPC): 1085 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1086 if (unlikely(!neigh)) { 1087 neigh_add_path(skb, phdr->hwaddr, dev); 1088 return NETDEV_TX_OK; 1089 } 1090 break; 1091 case htons(ETH_P_ARP): 1092 case htons(ETH_P_RARP): 1093 /* for unicast ARP and RARP should always perform path find */ 1094 unicast_arp_send(skb, dev, phdr); 1095 return NETDEV_TX_OK; 1096 default: 1097 /* ethertype not supported by IPoIB */ 1098 ++dev->stats.tx_dropped; 1099 dev_kfree_skb_any(skb); 1100 return NETDEV_TX_OK; 1101 } 1102 1103 send_using_neigh: 1104 /* note we now hold a ref to neigh */ 1105 if (ipoib_cm_get(neigh)) { 1106 if (ipoib_cm_up(neigh)) { 1107 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); 1108 goto unref; 1109 } 1110 } else if (neigh->ah) { 1111 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(phdr->hwaddr)); 1112 goto unref; 1113 } 1114 1115 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1116 /* put pseudoheader back on for next time */ 1117 skb_push(skb, sizeof(*phdr)); 1118 spin_lock_irqsave(&priv->lock, flags); 1119 __skb_queue_tail(&neigh->queue, skb); 1120 spin_unlock_irqrestore(&priv->lock, flags); 1121 } else { 1122 ++dev->stats.tx_dropped; 1123 dev_kfree_skb_any(skb); 1124 } 1125 1126 unref: 1127 ipoib_neigh_put(neigh); 1128 1129 return NETDEV_TX_OK; 1130 } 1131 1132 static void ipoib_timeout(struct net_device *dev) 1133 { 1134 struct ipoib_dev_priv *priv = netdev_priv(dev); 1135 1136 ipoib_warn(priv, "transmit timeout: latency %d msecs\n", 1137 jiffies_to_msecs(jiffies - dev_trans_start(dev))); 1138 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n", 1139 netif_queue_stopped(dev), 1140 priv->tx_head, priv->tx_tail); 1141 /* XXX reset QP, etc. */ 1142 } 1143 1144 static int ipoib_hard_header(struct sk_buff *skb, 1145 struct net_device *dev, 1146 unsigned short type, 1147 const void *daddr, const void *saddr, unsigned len) 1148 { 1149 struct ipoib_pseudo_header *phdr; 1150 struct ipoib_header *header; 1151 1152 header = (struct ipoib_header *) skb_push(skb, sizeof *header); 1153 1154 header->proto = htons(type); 1155 header->reserved = 0; 1156 1157 /* 1158 * we don't rely on dst_entry structure, always stuff the 1159 * destination address into skb hard header so we can figure out where 1160 * to send the packet later. 1161 */ 1162 phdr = (struct ipoib_pseudo_header *) skb_push(skb, sizeof(*phdr)); 1163 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN); 1164 1165 return IPOIB_HARD_LEN; 1166 } 1167 1168 static void ipoib_set_mcast_list(struct net_device *dev) 1169 { 1170 struct ipoib_dev_priv *priv = netdev_priv(dev); 1171 1172 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 1173 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); 1174 return; 1175 } 1176 1177 queue_work(priv->wq, &priv->restart_task); 1178 } 1179 1180 static int ipoib_get_iflink(const struct net_device *dev) 1181 { 1182 struct ipoib_dev_priv *priv = netdev_priv(dev); 1183 1184 /* parent interface */ 1185 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1186 return dev->ifindex; 1187 1188 /* child/vlan interface */ 1189 return priv->parent->ifindex; 1190 } 1191 1192 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr) 1193 { 1194 /* 1195 * Use only the address parts that contributes to spreading 1196 * The subnet prefix is not used as one can not connect to 1197 * same remote port (GUID) using the same remote QPN via two 1198 * different subnets. 1199 */ 1200 /* qpn octets[1:4) & port GUID octets[12:20) */ 1201 u32 *d32 = (u32 *) daddr; 1202 u32 hv; 1203 1204 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0); 1205 return hv & htbl->mask; 1206 } 1207 1208 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr) 1209 { 1210 struct ipoib_dev_priv *priv = netdev_priv(dev); 1211 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1212 struct ipoib_neigh_hash *htbl; 1213 struct ipoib_neigh *neigh = NULL; 1214 u32 hash_val; 1215 1216 rcu_read_lock_bh(); 1217 1218 htbl = rcu_dereference_bh(ntbl->htbl); 1219 1220 if (!htbl) 1221 goto out_unlock; 1222 1223 hash_val = ipoib_addr_hash(htbl, daddr); 1224 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]); 1225 neigh != NULL; 1226 neigh = rcu_dereference_bh(neigh->hnext)) { 1227 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1228 /* found, take one ref on behalf of the caller */ 1229 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1230 /* deleted */ 1231 neigh = NULL; 1232 goto out_unlock; 1233 } 1234 1235 if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)) 1236 neigh->alive = jiffies; 1237 goto out_unlock; 1238 } 1239 } 1240 1241 out_unlock: 1242 rcu_read_unlock_bh(); 1243 return neigh; 1244 } 1245 1246 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv) 1247 { 1248 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1249 struct ipoib_neigh_hash *htbl; 1250 unsigned long neigh_obsolete; 1251 unsigned long dt; 1252 unsigned long flags; 1253 int i; 1254 LIST_HEAD(remove_list); 1255 1256 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 1257 return; 1258 1259 spin_lock_irqsave(&priv->lock, flags); 1260 1261 htbl = rcu_dereference_protected(ntbl->htbl, 1262 lockdep_is_held(&priv->lock)); 1263 1264 if (!htbl) 1265 goto out_unlock; 1266 1267 /* neigh is obsolete if it was idle for two GC periods */ 1268 dt = 2 * arp_tbl.gc_interval; 1269 neigh_obsolete = jiffies - dt; 1270 /* handle possible race condition */ 1271 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 1272 goto out_unlock; 1273 1274 for (i = 0; i < htbl->size; i++) { 1275 struct ipoib_neigh *neigh; 1276 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1277 1278 while ((neigh = rcu_dereference_protected(*np, 1279 lockdep_is_held(&priv->lock))) != NULL) { 1280 /* was the neigh idle for two GC periods */ 1281 if (time_after(neigh_obsolete, neigh->alive)) { 1282 1283 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list); 1284 1285 rcu_assign_pointer(*np, 1286 rcu_dereference_protected(neigh->hnext, 1287 lockdep_is_held(&priv->lock))); 1288 /* remove from path/mc list */ 1289 list_del(&neigh->list); 1290 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1291 } else { 1292 np = &neigh->hnext; 1293 } 1294 1295 } 1296 } 1297 1298 out_unlock: 1299 spin_unlock_irqrestore(&priv->lock, flags); 1300 ipoib_mcast_remove_list(&remove_list); 1301 } 1302 1303 static void ipoib_reap_neigh(struct work_struct *work) 1304 { 1305 struct ipoib_dev_priv *priv = 1306 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work); 1307 1308 __ipoib_reap_neigh(priv); 1309 1310 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags)) 1311 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1312 arp_tbl.gc_interval); 1313 } 1314 1315 1316 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr, 1317 struct net_device *dev) 1318 { 1319 struct ipoib_neigh *neigh; 1320 1321 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC); 1322 if (!neigh) 1323 return NULL; 1324 1325 neigh->dev = dev; 1326 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr)); 1327 skb_queue_head_init(&neigh->queue); 1328 INIT_LIST_HEAD(&neigh->list); 1329 ipoib_cm_set(neigh, NULL); 1330 /* one ref on behalf of the caller */ 1331 atomic_set(&neigh->refcnt, 1); 1332 1333 return neigh; 1334 } 1335 1336 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr, 1337 struct net_device *dev) 1338 { 1339 struct ipoib_dev_priv *priv = netdev_priv(dev); 1340 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1341 struct ipoib_neigh_hash *htbl; 1342 struct ipoib_neigh *neigh; 1343 u32 hash_val; 1344 1345 htbl = rcu_dereference_protected(ntbl->htbl, 1346 lockdep_is_held(&priv->lock)); 1347 if (!htbl) { 1348 neigh = NULL; 1349 goto out_unlock; 1350 } 1351 1352 /* need to add a new neigh, but maybe some other thread succeeded? 1353 * recalc hash, maybe hash resize took place so we do a search 1354 */ 1355 hash_val = ipoib_addr_hash(htbl, daddr); 1356 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val], 1357 lockdep_is_held(&priv->lock)); 1358 neigh != NULL; 1359 neigh = rcu_dereference_protected(neigh->hnext, 1360 lockdep_is_held(&priv->lock))) { 1361 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1362 /* found, take one ref on behalf of the caller */ 1363 if (!atomic_inc_not_zero(&neigh->refcnt)) { 1364 /* deleted */ 1365 neigh = NULL; 1366 break; 1367 } 1368 neigh->alive = jiffies; 1369 goto out_unlock; 1370 } 1371 } 1372 1373 neigh = ipoib_neigh_ctor(daddr, dev); 1374 if (!neigh) 1375 goto out_unlock; 1376 1377 /* one ref on behalf of the hash table */ 1378 atomic_inc(&neigh->refcnt); 1379 neigh->alive = jiffies; 1380 /* put in hash */ 1381 rcu_assign_pointer(neigh->hnext, 1382 rcu_dereference_protected(htbl->buckets[hash_val], 1383 lockdep_is_held(&priv->lock))); 1384 rcu_assign_pointer(htbl->buckets[hash_val], neigh); 1385 atomic_inc(&ntbl->entries); 1386 1387 out_unlock: 1388 1389 return neigh; 1390 } 1391 1392 void ipoib_neigh_dtor(struct ipoib_neigh *neigh) 1393 { 1394 /* neigh reference count was dropprd to zero */ 1395 struct net_device *dev = neigh->dev; 1396 struct ipoib_dev_priv *priv = netdev_priv(dev); 1397 struct sk_buff *skb; 1398 if (neigh->ah) 1399 ipoib_put_ah(neigh->ah); 1400 while ((skb = __skb_dequeue(&neigh->queue))) { 1401 ++dev->stats.tx_dropped; 1402 dev_kfree_skb_any(skb); 1403 } 1404 if (ipoib_cm_get(neigh)) 1405 ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); 1406 ipoib_dbg(netdev_priv(dev), 1407 "neigh free for %06x %pI6\n", 1408 IPOIB_QPN(neigh->daddr), 1409 neigh->daddr + 4); 1410 kfree(neigh); 1411 if (atomic_dec_and_test(&priv->ntbl.entries)) { 1412 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags)) 1413 complete(&priv->ntbl.flushed); 1414 } 1415 } 1416 1417 static void ipoib_neigh_reclaim(struct rcu_head *rp) 1418 { 1419 /* Called as a result of removal from hash table */ 1420 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu); 1421 /* note TX context may hold another ref */ 1422 ipoib_neigh_put(neigh); 1423 } 1424 1425 void ipoib_neigh_free(struct ipoib_neigh *neigh) 1426 { 1427 struct net_device *dev = neigh->dev; 1428 struct ipoib_dev_priv *priv = netdev_priv(dev); 1429 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1430 struct ipoib_neigh_hash *htbl; 1431 struct ipoib_neigh __rcu **np; 1432 struct ipoib_neigh *n; 1433 u32 hash_val; 1434 1435 htbl = rcu_dereference_protected(ntbl->htbl, 1436 lockdep_is_held(&priv->lock)); 1437 if (!htbl) 1438 return; 1439 1440 hash_val = ipoib_addr_hash(htbl, neigh->daddr); 1441 np = &htbl->buckets[hash_val]; 1442 for (n = rcu_dereference_protected(*np, 1443 lockdep_is_held(&priv->lock)); 1444 n != NULL; 1445 n = rcu_dereference_protected(*np, 1446 lockdep_is_held(&priv->lock))) { 1447 if (n == neigh) { 1448 /* found */ 1449 rcu_assign_pointer(*np, 1450 rcu_dereference_protected(neigh->hnext, 1451 lockdep_is_held(&priv->lock))); 1452 /* remove from parent list */ 1453 list_del(&neigh->list); 1454 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1455 return; 1456 } else { 1457 np = &n->hnext; 1458 } 1459 } 1460 } 1461 1462 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv) 1463 { 1464 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1465 struct ipoib_neigh_hash *htbl; 1466 struct ipoib_neigh __rcu **buckets; 1467 u32 size; 1468 1469 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1470 ntbl->htbl = NULL; 1471 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL); 1472 if (!htbl) 1473 return -ENOMEM; 1474 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1475 size = roundup_pow_of_two(arp_tbl.gc_thresh3); 1476 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL); 1477 if (!buckets) { 1478 kfree(htbl); 1479 return -ENOMEM; 1480 } 1481 htbl->size = size; 1482 htbl->mask = (size - 1); 1483 htbl->buckets = buckets; 1484 RCU_INIT_POINTER(ntbl->htbl, htbl); 1485 htbl->ntbl = ntbl; 1486 atomic_set(&ntbl->entries, 0); 1487 1488 /* start garbage collection */ 1489 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1490 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1491 arp_tbl.gc_interval); 1492 1493 return 0; 1494 } 1495 1496 static void neigh_hash_free_rcu(struct rcu_head *head) 1497 { 1498 struct ipoib_neigh_hash *htbl = container_of(head, 1499 struct ipoib_neigh_hash, 1500 rcu); 1501 struct ipoib_neigh __rcu **buckets = htbl->buckets; 1502 struct ipoib_neigh_table *ntbl = htbl->ntbl; 1503 1504 kfree(buckets); 1505 kfree(htbl); 1506 complete(&ntbl->deleted); 1507 } 1508 1509 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid) 1510 { 1511 struct ipoib_dev_priv *priv = netdev_priv(dev); 1512 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1513 struct ipoib_neigh_hash *htbl; 1514 unsigned long flags; 1515 int i; 1516 1517 /* remove all neigh connected to a given path or mcast */ 1518 spin_lock_irqsave(&priv->lock, flags); 1519 1520 htbl = rcu_dereference_protected(ntbl->htbl, 1521 lockdep_is_held(&priv->lock)); 1522 1523 if (!htbl) 1524 goto out_unlock; 1525 1526 for (i = 0; i < htbl->size; i++) { 1527 struct ipoib_neigh *neigh; 1528 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1529 1530 while ((neigh = rcu_dereference_protected(*np, 1531 lockdep_is_held(&priv->lock))) != NULL) { 1532 /* delete neighs belong to this parent */ 1533 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) { 1534 rcu_assign_pointer(*np, 1535 rcu_dereference_protected(neigh->hnext, 1536 lockdep_is_held(&priv->lock))); 1537 /* remove from parent list */ 1538 list_del(&neigh->list); 1539 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1540 } else { 1541 np = &neigh->hnext; 1542 } 1543 1544 } 1545 } 1546 out_unlock: 1547 spin_unlock_irqrestore(&priv->lock, flags); 1548 } 1549 1550 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv) 1551 { 1552 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1553 struct ipoib_neigh_hash *htbl; 1554 unsigned long flags; 1555 int i, wait_flushed = 0; 1556 1557 init_completion(&priv->ntbl.flushed); 1558 1559 spin_lock_irqsave(&priv->lock, flags); 1560 1561 htbl = rcu_dereference_protected(ntbl->htbl, 1562 lockdep_is_held(&priv->lock)); 1563 if (!htbl) 1564 goto out_unlock; 1565 1566 wait_flushed = atomic_read(&priv->ntbl.entries); 1567 if (!wait_flushed) 1568 goto free_htbl; 1569 1570 for (i = 0; i < htbl->size; i++) { 1571 struct ipoib_neigh *neigh; 1572 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1573 1574 while ((neigh = rcu_dereference_protected(*np, 1575 lockdep_is_held(&priv->lock))) != NULL) { 1576 rcu_assign_pointer(*np, 1577 rcu_dereference_protected(neigh->hnext, 1578 lockdep_is_held(&priv->lock))); 1579 /* remove from path/mc list */ 1580 list_del(&neigh->list); 1581 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1582 } 1583 } 1584 1585 free_htbl: 1586 rcu_assign_pointer(ntbl->htbl, NULL); 1587 call_rcu(&htbl->rcu, neigh_hash_free_rcu); 1588 1589 out_unlock: 1590 spin_unlock_irqrestore(&priv->lock, flags); 1591 if (wait_flushed) 1592 wait_for_completion(&priv->ntbl.flushed); 1593 } 1594 1595 static void ipoib_neigh_hash_uninit(struct net_device *dev) 1596 { 1597 struct ipoib_dev_priv *priv = netdev_priv(dev); 1598 int stopped; 1599 1600 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n"); 1601 init_completion(&priv->ntbl.deleted); 1602 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1603 1604 /* Stop GC if called at init fail need to cancel work */ 1605 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 1606 if (!stopped) 1607 cancel_delayed_work(&priv->neigh_reap_task); 1608 1609 ipoib_flush_neighs(priv); 1610 1611 wait_for_completion(&priv->ntbl.deleted); 1612 } 1613 1614 1615 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port) 1616 { 1617 struct ipoib_dev_priv *priv = netdev_priv(dev); 1618 1619 /* Allocate RX/TX "rings" to hold queued skbs */ 1620 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring, 1621 GFP_KERNEL); 1622 if (!priv->rx_ring) 1623 goto out; 1624 1625 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring); 1626 if (!priv->tx_ring) { 1627 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n", 1628 ca->name, ipoib_sendq_size); 1629 goto out_rx_ring_cleanup; 1630 } 1631 1632 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */ 1633 1634 if (ipoib_ib_dev_init(dev, ca, port)) 1635 goto out_tx_ring_cleanup; 1636 1637 /* 1638 * Must be after ipoib_ib_dev_init so we can allocate a per 1639 * device wq there and use it here 1640 */ 1641 if (ipoib_neigh_hash_init(priv) < 0) 1642 goto out_dev_uninit; 1643 1644 return 0; 1645 1646 out_dev_uninit: 1647 ipoib_ib_dev_cleanup(dev); 1648 1649 out_tx_ring_cleanup: 1650 vfree(priv->tx_ring); 1651 1652 out_rx_ring_cleanup: 1653 kfree(priv->rx_ring); 1654 1655 out: 1656 return -ENOMEM; 1657 } 1658 1659 void ipoib_dev_cleanup(struct net_device *dev) 1660 { 1661 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv; 1662 LIST_HEAD(head); 1663 1664 ASSERT_RTNL(); 1665 1666 ipoib_delete_debug_files(dev); 1667 1668 /* Delete any child interfaces first */ 1669 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) { 1670 /* Stop GC on child */ 1671 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags); 1672 cancel_delayed_work(&cpriv->neigh_reap_task); 1673 unregister_netdevice_queue(cpriv->dev, &head); 1674 } 1675 unregister_netdevice_many(&head); 1676 1677 /* 1678 * Must be before ipoib_ib_dev_cleanup or we delete an in use 1679 * work queue 1680 */ 1681 ipoib_neigh_hash_uninit(dev); 1682 1683 ipoib_ib_dev_cleanup(dev); 1684 1685 kfree(priv->rx_ring); 1686 vfree(priv->tx_ring); 1687 1688 priv->rx_ring = NULL; 1689 priv->tx_ring = NULL; 1690 } 1691 1692 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state) 1693 { 1694 struct ipoib_dev_priv *priv = netdev_priv(dev); 1695 1696 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state); 1697 } 1698 1699 static int ipoib_get_vf_config(struct net_device *dev, int vf, 1700 struct ifla_vf_info *ivf) 1701 { 1702 struct ipoib_dev_priv *priv = netdev_priv(dev); 1703 int err; 1704 1705 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf); 1706 if (err) 1707 return err; 1708 1709 ivf->vf = vf; 1710 1711 return 0; 1712 } 1713 1714 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type) 1715 { 1716 struct ipoib_dev_priv *priv = netdev_priv(dev); 1717 1718 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID) 1719 return -EINVAL; 1720 1721 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type); 1722 } 1723 1724 static int ipoib_get_vf_stats(struct net_device *dev, int vf, 1725 struct ifla_vf_stats *vf_stats) 1726 { 1727 struct ipoib_dev_priv *priv = netdev_priv(dev); 1728 1729 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats); 1730 } 1731 1732 static const struct header_ops ipoib_header_ops = { 1733 .create = ipoib_hard_header, 1734 }; 1735 1736 static const struct net_device_ops ipoib_netdev_ops_pf = { 1737 .ndo_uninit = ipoib_uninit, 1738 .ndo_open = ipoib_open, 1739 .ndo_stop = ipoib_stop, 1740 .ndo_change_mtu = ipoib_change_mtu, 1741 .ndo_fix_features = ipoib_fix_features, 1742 .ndo_start_xmit = ipoib_start_xmit, 1743 .ndo_tx_timeout = ipoib_timeout, 1744 .ndo_set_rx_mode = ipoib_set_mcast_list, 1745 .ndo_get_iflink = ipoib_get_iflink, 1746 .ndo_set_vf_link_state = ipoib_set_vf_link_state, 1747 .ndo_get_vf_config = ipoib_get_vf_config, 1748 .ndo_get_vf_stats = ipoib_get_vf_stats, 1749 .ndo_set_vf_guid = ipoib_set_vf_guid, 1750 .ndo_set_mac_address = ipoib_set_mac, 1751 }; 1752 1753 static const struct net_device_ops ipoib_netdev_ops_vf = { 1754 .ndo_uninit = ipoib_uninit, 1755 .ndo_open = ipoib_open, 1756 .ndo_stop = ipoib_stop, 1757 .ndo_change_mtu = ipoib_change_mtu, 1758 .ndo_fix_features = ipoib_fix_features, 1759 .ndo_start_xmit = ipoib_start_xmit, 1760 .ndo_tx_timeout = ipoib_timeout, 1761 .ndo_set_rx_mode = ipoib_set_mcast_list, 1762 .ndo_get_iflink = ipoib_get_iflink, 1763 }; 1764 1765 void ipoib_setup(struct net_device *dev) 1766 { 1767 struct ipoib_dev_priv *priv = netdev_priv(dev); 1768 1769 if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION) 1770 dev->netdev_ops = &ipoib_netdev_ops_vf; 1771 else 1772 dev->netdev_ops = &ipoib_netdev_ops_pf; 1773 1774 dev->header_ops = &ipoib_header_ops; 1775 1776 ipoib_set_ethtool_ops(dev); 1777 1778 netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT); 1779 1780 dev->watchdog_timeo = HZ; 1781 1782 dev->flags |= IFF_BROADCAST | IFF_MULTICAST; 1783 1784 dev->hard_header_len = IPOIB_HARD_LEN; 1785 dev->addr_len = INFINIBAND_ALEN; 1786 dev->type = ARPHRD_INFINIBAND; 1787 dev->tx_queue_len = ipoib_sendq_size * 2; 1788 dev->features = (NETIF_F_VLAN_CHALLENGED | 1789 NETIF_F_HIGHDMA); 1790 netif_keep_dst(dev); 1791 1792 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); 1793 1794 priv->dev = dev; 1795 1796 spin_lock_init(&priv->lock); 1797 1798 init_rwsem(&priv->vlan_rwsem); 1799 1800 INIT_LIST_HEAD(&priv->path_list); 1801 INIT_LIST_HEAD(&priv->child_intfs); 1802 INIT_LIST_HEAD(&priv->dead_ahs); 1803 INIT_LIST_HEAD(&priv->multicast_list); 1804 1805 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); 1806 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task); 1807 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light); 1808 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal); 1809 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy); 1810 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); 1811 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); 1812 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh); 1813 } 1814 1815 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name) 1816 { 1817 struct net_device *dev; 1818 1819 dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name, 1820 NET_NAME_UNKNOWN, ipoib_setup); 1821 if (!dev) 1822 return NULL; 1823 1824 return netdev_priv(dev); 1825 } 1826 1827 static ssize_t show_pkey(struct device *dev, 1828 struct device_attribute *attr, char *buf) 1829 { 1830 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1831 1832 return sprintf(buf, "0x%04x\n", priv->pkey); 1833 } 1834 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL); 1835 1836 static ssize_t show_umcast(struct device *dev, 1837 struct device_attribute *attr, char *buf) 1838 { 1839 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev)); 1840 1841 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); 1842 } 1843 1844 void ipoib_set_umcast(struct net_device *ndev, int umcast_val) 1845 { 1846 struct ipoib_dev_priv *priv = netdev_priv(ndev); 1847 1848 if (umcast_val > 0) { 1849 set_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1850 ipoib_warn(priv, "ignoring multicast groups joined directly " 1851 "by userspace\n"); 1852 } else 1853 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); 1854 } 1855 1856 static ssize_t set_umcast(struct device *dev, 1857 struct device_attribute *attr, 1858 const char *buf, size_t count) 1859 { 1860 unsigned long umcast_val = simple_strtoul(buf, NULL, 0); 1861 1862 ipoib_set_umcast(to_net_dev(dev), umcast_val); 1863 1864 return count; 1865 } 1866 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast); 1867 1868 int ipoib_add_umcast_attr(struct net_device *dev) 1869 { 1870 return device_create_file(&dev->dev, &dev_attr_umcast); 1871 } 1872 1873 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid) 1874 { 1875 struct ipoib_dev_priv *child_priv; 1876 struct net_device *netdev = priv->dev; 1877 1878 netif_addr_lock_bh(netdev); 1879 1880 memcpy(&priv->local_gid.global.interface_id, 1881 &gid->global.interface_id, 1882 sizeof(gid->global.interface_id)); 1883 memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid)); 1884 clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 1885 1886 netif_addr_unlock_bh(netdev); 1887 1888 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 1889 down_read(&priv->vlan_rwsem); 1890 list_for_each_entry(child_priv, &priv->child_intfs, list) 1891 set_base_guid(child_priv, gid); 1892 up_read(&priv->vlan_rwsem); 1893 } 1894 } 1895 1896 static int ipoib_check_lladdr(struct net_device *dev, 1897 struct sockaddr_storage *ss) 1898 { 1899 union ib_gid *gid = (union ib_gid *)(ss->__data + 4); 1900 int ret = 0; 1901 1902 netif_addr_lock_bh(dev); 1903 1904 /* Make sure the QPN, reserved and subnet prefix match the current 1905 * lladdr, it also makes sure the lladdr is unicast. 1906 */ 1907 if (memcmp(dev->dev_addr, ss->__data, 1908 4 + sizeof(gid->global.subnet_prefix)) || 1909 gid->global.interface_id == 0) 1910 ret = -EINVAL; 1911 1912 netif_addr_unlock_bh(dev); 1913 1914 return ret; 1915 } 1916 1917 static int ipoib_set_mac(struct net_device *dev, void *addr) 1918 { 1919 struct ipoib_dev_priv *priv = netdev_priv(dev); 1920 struct sockaddr_storage *ss = addr; 1921 int ret; 1922 1923 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) 1924 return -EBUSY; 1925 1926 ret = ipoib_check_lladdr(dev, ss); 1927 if (ret) 1928 return ret; 1929 1930 set_base_guid(priv, (union ib_gid *)(ss->__data + 4)); 1931 1932 queue_work(ipoib_workqueue, &priv->flush_light); 1933 1934 return 0; 1935 } 1936 1937 static ssize_t create_child(struct device *dev, 1938 struct device_attribute *attr, 1939 const char *buf, size_t count) 1940 { 1941 int pkey; 1942 int ret; 1943 1944 if (sscanf(buf, "%i", &pkey) != 1) 1945 return -EINVAL; 1946 1947 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000) 1948 return -EINVAL; 1949 1950 /* 1951 * Set the full membership bit, so that we join the right 1952 * broadcast group, etc. 1953 */ 1954 pkey |= 0x8000; 1955 1956 ret = ipoib_vlan_add(to_net_dev(dev), pkey); 1957 1958 return ret ? ret : count; 1959 } 1960 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child); 1961 1962 static ssize_t delete_child(struct device *dev, 1963 struct device_attribute *attr, 1964 const char *buf, size_t count) 1965 { 1966 int pkey; 1967 int ret; 1968 1969 if (sscanf(buf, "%i", &pkey) != 1) 1970 return -EINVAL; 1971 1972 if (pkey < 0 || pkey > 0xffff) 1973 return -EINVAL; 1974 1975 ret = ipoib_vlan_delete(to_net_dev(dev), pkey); 1976 1977 return ret ? ret : count; 1978 1979 } 1980 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child); 1981 1982 int ipoib_add_pkey_attr(struct net_device *dev) 1983 { 1984 return device_create_file(&dev->dev, &dev_attr_pkey); 1985 } 1986 1987 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca) 1988 { 1989 priv->hca_caps = hca->attrs.device_cap_flags; 1990 1991 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { 1992 priv->dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM; 1993 1994 if (priv->hca_caps & IB_DEVICE_UD_TSO) 1995 priv->dev->hw_features |= NETIF_F_TSO; 1996 1997 priv->dev->features |= priv->dev->hw_features; 1998 } 1999 2000 return 0; 2001 } 2002 2003 static struct net_device *ipoib_add_port(const char *format, 2004 struct ib_device *hca, u8 port) 2005 { 2006 struct ipoib_dev_priv *priv; 2007 struct ib_port_attr attr; 2008 int result = -ENOMEM; 2009 2010 priv = ipoib_intf_alloc(format); 2011 if (!priv) 2012 goto alloc_mem_failed; 2013 2014 SET_NETDEV_DEV(priv->dev, hca->dma_device); 2015 priv->dev->dev_id = port - 1; 2016 2017 result = ib_query_port(hca, port, &attr); 2018 if (!result) 2019 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu); 2020 else { 2021 printk(KERN_WARNING "%s: ib_query_port %d failed\n", 2022 hca->name, port); 2023 goto device_init_failed; 2024 } 2025 2026 /* MTU will be reset when mcast join happens */ 2027 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); 2028 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu; 2029 priv->dev->max_mtu = IPOIB_CM_MTU; 2030 2031 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh); 2032 2033 result = ib_query_pkey(hca, port, 0, &priv->pkey); 2034 if (result) { 2035 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n", 2036 hca->name, port, result); 2037 goto device_init_failed; 2038 } 2039 2040 result = ipoib_set_dev_features(priv, hca); 2041 if (result) 2042 goto device_init_failed; 2043 2044 /* 2045 * Set the full membership bit, so that we join the right 2046 * broadcast group, etc. 2047 */ 2048 priv->pkey |= 0x8000; 2049 2050 priv->dev->broadcast[8] = priv->pkey >> 8; 2051 priv->dev->broadcast[9] = priv->pkey & 0xff; 2052 2053 result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL); 2054 if (result) { 2055 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n", 2056 hca->name, port, result); 2057 goto device_init_failed; 2058 } else 2059 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid)); 2060 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 2061 2062 result = ipoib_dev_init(priv->dev, hca, port); 2063 if (result < 0) { 2064 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n", 2065 hca->name, port, result); 2066 goto device_init_failed; 2067 } 2068 2069 INIT_IB_EVENT_HANDLER(&priv->event_handler, 2070 priv->ca, ipoib_event); 2071 result = ib_register_event_handler(&priv->event_handler); 2072 if (result < 0) { 2073 printk(KERN_WARNING "%s: ib_register_event_handler failed for " 2074 "port %d (ret = %d)\n", 2075 hca->name, port, result); 2076 goto event_failed; 2077 } 2078 2079 result = register_netdev(priv->dev); 2080 if (result) { 2081 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n", 2082 hca->name, port, result); 2083 goto register_failed; 2084 } 2085 2086 ipoib_create_debug_files(priv->dev); 2087 2088 if (ipoib_cm_add_mode_attr(priv->dev)) 2089 goto sysfs_failed; 2090 if (ipoib_add_pkey_attr(priv->dev)) 2091 goto sysfs_failed; 2092 if (ipoib_add_umcast_attr(priv->dev)) 2093 goto sysfs_failed; 2094 if (device_create_file(&priv->dev->dev, &dev_attr_create_child)) 2095 goto sysfs_failed; 2096 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child)) 2097 goto sysfs_failed; 2098 2099 return priv->dev; 2100 2101 sysfs_failed: 2102 ipoib_delete_debug_files(priv->dev); 2103 unregister_netdev(priv->dev); 2104 2105 register_failed: 2106 ib_unregister_event_handler(&priv->event_handler); 2107 flush_workqueue(ipoib_workqueue); 2108 /* Stop GC if started before flush */ 2109 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 2110 cancel_delayed_work(&priv->neigh_reap_task); 2111 flush_workqueue(priv->wq); 2112 2113 event_failed: 2114 ipoib_dev_cleanup(priv->dev); 2115 2116 device_init_failed: 2117 free_netdev(priv->dev); 2118 2119 alloc_mem_failed: 2120 return ERR_PTR(result); 2121 } 2122 2123 static void ipoib_add_one(struct ib_device *device) 2124 { 2125 struct list_head *dev_list; 2126 struct net_device *dev; 2127 struct ipoib_dev_priv *priv; 2128 int p; 2129 int count = 0; 2130 2131 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL); 2132 if (!dev_list) 2133 return; 2134 2135 INIT_LIST_HEAD(dev_list); 2136 2137 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) { 2138 if (!rdma_protocol_ib(device, p)) 2139 continue; 2140 dev = ipoib_add_port("ib%d", device, p); 2141 if (!IS_ERR(dev)) { 2142 priv = netdev_priv(dev); 2143 list_add_tail(&priv->list, dev_list); 2144 count++; 2145 } 2146 } 2147 2148 if (!count) { 2149 kfree(dev_list); 2150 return; 2151 } 2152 2153 ib_set_client_data(device, &ipoib_client, dev_list); 2154 } 2155 2156 static void ipoib_remove_one(struct ib_device *device, void *client_data) 2157 { 2158 struct ipoib_dev_priv *priv, *tmp; 2159 struct list_head *dev_list = client_data; 2160 2161 if (!dev_list) 2162 return; 2163 2164 list_for_each_entry_safe(priv, tmp, dev_list, list) { 2165 ib_unregister_event_handler(&priv->event_handler); 2166 flush_workqueue(ipoib_workqueue); 2167 2168 /* mark interface in the middle of destruction */ 2169 set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags); 2170 2171 rtnl_lock(); 2172 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP); 2173 rtnl_unlock(); 2174 2175 /* Stop GC */ 2176 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags); 2177 cancel_delayed_work(&priv->neigh_reap_task); 2178 flush_workqueue(priv->wq); 2179 2180 unregister_netdev(priv->dev); 2181 free_netdev(priv->dev); 2182 } 2183 2184 kfree(dev_list); 2185 } 2186 2187 static int __init ipoib_init_module(void) 2188 { 2189 int ret; 2190 2191 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); 2192 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); 2193 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); 2194 2195 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); 2196 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); 2197 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE); 2198 #ifdef CONFIG_INFINIBAND_IPOIB_CM 2199 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); 2200 #endif 2201 2202 /* 2203 * When copying small received packets, we only copy from the 2204 * linear data part of the SKB, so we rely on this condition. 2205 */ 2206 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE); 2207 2208 ret = ipoib_register_debugfs(); 2209 if (ret) 2210 return ret; 2211 2212 /* 2213 * We create a global workqueue here that is used for all flush 2214 * operations. However, if you attempt to flush a workqueue 2215 * from a task on that same workqueue, it deadlocks the system. 2216 * We want to be able to flush the tasks associated with a 2217 * specific net device, so we also create a workqueue for each 2218 * netdevice. We queue up the tasks for that device only on 2219 * its private workqueue, and we only queue up flush events 2220 * on our global flush workqueue. This avoids the deadlocks. 2221 */ 2222 ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 2223 WQ_MEM_RECLAIM); 2224 if (!ipoib_workqueue) { 2225 ret = -ENOMEM; 2226 goto err_fs; 2227 } 2228 2229 ib_sa_register_client(&ipoib_sa_client); 2230 2231 ret = ib_register_client(&ipoib_client); 2232 if (ret) 2233 goto err_sa; 2234 2235 ret = ipoib_netlink_init(); 2236 if (ret) 2237 goto err_client; 2238 2239 return 0; 2240 2241 err_client: 2242 ib_unregister_client(&ipoib_client); 2243 2244 err_sa: 2245 ib_sa_unregister_client(&ipoib_sa_client); 2246 destroy_workqueue(ipoib_workqueue); 2247 2248 err_fs: 2249 ipoib_unregister_debugfs(); 2250 2251 return ret; 2252 } 2253 2254 static void __exit ipoib_cleanup_module(void) 2255 { 2256 ipoib_netlink_fini(); 2257 ib_unregister_client(&ipoib_client); 2258 ib_sa_unregister_client(&ipoib_sa_client); 2259 ipoib_unregister_debugfs(); 2260 destroy_workqueue(ipoib_workqueue); 2261 } 2262 2263 module_init(ipoib_init_module); 2264 module_exit(ipoib_cleanup_module); 2265