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 55MODULE_AUTHOR("Roland Dreier"); 56MODULE_DESCRIPTION("IP-over-InfiniBand net driver"); 57MODULE_LICENSE("Dual BSD/GPL"); 58 59int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE; 60int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE; 61 62module_param_named(send_queue_size, ipoib_sendq_size, int, 0444); 63MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue"); 64module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444); 65MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue"); 66 67#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 68int ipoib_debug_level; 69 70module_param_named(debug_level, ipoib_debug_level, int, 0644); 71MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0"); 72#endif 73 74struct ipoib_path_iter { 75 struct net_device *dev; 76 struct ipoib_path path; 77}; 78 79static const u8 ipv4_bcast_addr[] = { 80 0x00, 0xff, 0xff, 0xff, 81 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00, 82 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff 83}; 84 85struct workqueue_struct *ipoib_workqueue; 86 87struct ib_sa_client ipoib_sa_client; 88 89static int ipoib_add_one(struct ib_device *device); 90static void ipoib_remove_one(struct ib_device *device, void *client_data); 91static void ipoib_neigh_reclaim(struct rcu_head *rp); 92static struct net_device *ipoib_get_net_dev_by_params( 93 struct ib_device *dev, u32 port, u16 pkey, 94 const union ib_gid *gid, const struct sockaddr *addr, 95 void *client_data); 96static int ipoib_set_mac(struct net_device *dev, void *addr); 97static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr, 98 int cmd); 99 100static struct ib_client ipoib_client = { 101 .name = "ipoib", 102 .add = ipoib_add_one, 103 .remove = ipoib_remove_one, 104 .get_net_dev_by_params = ipoib_get_net_dev_by_params, 105}; 106 107#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 108static int ipoib_netdev_event(struct notifier_block *this, 109 unsigned long event, void *ptr) 110{ 111 struct netdev_notifier_info *ni = ptr; 112 struct net_device *dev = ni->dev; 113 114 if (dev->netdev_ops->ndo_open != ipoib_open) 115 return NOTIFY_DONE; 116 117 switch (event) { 118 case NETDEV_REGISTER: 119 ipoib_create_debug_files(dev); 120 break; 121 case NETDEV_CHANGENAME: 122 ipoib_delete_debug_files(dev); 123 ipoib_create_debug_files(dev); 124 break; 125 case NETDEV_UNREGISTER: 126 ipoib_delete_debug_files(dev); 127 break; 128 } 129 130 return NOTIFY_DONE; 131} 132#endif 133 134int ipoib_open(struct net_device *dev) 135{ 136 struct ipoib_dev_priv *priv = ipoib_priv(dev); 137 138 ipoib_dbg(priv, "bringing up interface\n"); 139 140 netif_carrier_off(dev); 141 142 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 143 144 if (ipoib_ib_dev_open(dev)) { 145 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) 146 return 0; 147 goto err_disable; 148 } 149 150 ipoib_ib_dev_up(dev); 151 152 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 153 struct ipoib_dev_priv *cpriv; 154 155 /* Bring up any child interfaces too */ 156 down_read(&priv->vlan_rwsem); 157 list_for_each_entry(cpriv, &priv->child_intfs, list) { 158 int flags; 159 160 flags = cpriv->dev->flags; 161 if (flags & IFF_UP) 162 continue; 163 164 dev_change_flags(cpriv->dev, flags | IFF_UP, NULL); 165 } 166 up_read(&priv->vlan_rwsem); 167 } else if (priv->parent) { 168 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); 169 170 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &ppriv->flags)) 171 ipoib_dbg(priv, "parent device %s is not up, so child device may be not functioning.\n", 172 ppriv->dev->name); 173 } 174 netif_start_queue(dev); 175 176 return 0; 177 178err_disable: 179 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 180 181 return -EINVAL; 182} 183 184static int ipoib_stop(struct net_device *dev) 185{ 186 struct ipoib_dev_priv *priv = ipoib_priv(dev); 187 188 ipoib_dbg(priv, "stopping interface\n"); 189 190 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); 191 192 netif_stop_queue(dev); 193 194 ipoib_ib_dev_down(dev); 195 ipoib_ib_dev_stop(dev); 196 197 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 198 struct ipoib_dev_priv *cpriv; 199 200 /* Bring down any child interfaces too */ 201 down_read(&priv->vlan_rwsem); 202 list_for_each_entry(cpriv, &priv->child_intfs, list) { 203 int flags; 204 205 flags = cpriv->dev->flags; 206 if (!(flags & IFF_UP)) 207 continue; 208 209 dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL); 210 } 211 up_read(&priv->vlan_rwsem); 212 } 213 214 return 0; 215} 216 217static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features) 218{ 219 struct ipoib_dev_priv *priv = ipoib_priv(dev); 220 221 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) 222 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO); 223 224 return features; 225} 226 227static int ipoib_change_mtu(struct net_device *dev, int new_mtu) 228{ 229 struct ipoib_dev_priv *priv = ipoib_priv(dev); 230 int ret = 0; 231 232 /* dev->mtu > 2K ==> connected mode */ 233 if (ipoib_cm_admin_enabled(dev)) { 234 if (new_mtu > ipoib_cm_max_mtu(dev)) 235 return -EINVAL; 236 237 if (new_mtu > priv->mcast_mtu) 238 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n", 239 priv->mcast_mtu); 240 241 dev->mtu = new_mtu; 242 return 0; 243 } 244 245 if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) || 246 new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu)) 247 return -EINVAL; 248 249 priv->admin_mtu = new_mtu; 250 251 if (priv->mcast_mtu < priv->admin_mtu) 252 ipoib_dbg(priv, "MTU must be smaller than the underlying " 253 "link layer MTU - 4 (%u)\n", priv->mcast_mtu); 254 255 new_mtu = min(priv->mcast_mtu, priv->admin_mtu); 256 257 if (priv->rn_ops->ndo_change_mtu) { 258 bool carrier_status = netif_carrier_ok(dev); 259 260 netif_carrier_off(dev); 261 262 /* notify lower level on the real mtu */ 263 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu); 264 265 if (carrier_status) 266 netif_carrier_on(dev); 267 } else { 268 dev->mtu = new_mtu; 269 } 270 271 return ret; 272} 273 274static void ipoib_get_stats(struct net_device *dev, 275 struct rtnl_link_stats64 *stats) 276{ 277 struct ipoib_dev_priv *priv = ipoib_priv(dev); 278 279 if (priv->rn_ops->ndo_get_stats64) 280 priv->rn_ops->ndo_get_stats64(dev, stats); 281 else 282 netdev_stats_to_stats64(stats, &dev->stats); 283} 284 285/* Called with an RCU read lock taken */ 286static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr, 287 struct net_device *dev) 288{ 289 struct net *net = dev_net(dev); 290 struct in_device *in_dev; 291 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr; 292 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr; 293 __be32 ret_addr; 294 295 switch (addr->sa_family) { 296 case AF_INET: 297 in_dev = in_dev_get(dev); 298 if (!in_dev) 299 return false; 300 301 ret_addr = inet_confirm_addr(net, in_dev, 0, 302 addr_in->sin_addr.s_addr, 303 RT_SCOPE_HOST); 304 in_dev_put(in_dev); 305 if (ret_addr) 306 return true; 307 308 break; 309 case AF_INET6: 310 if (IS_ENABLED(CONFIG_IPV6) && 311 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1)) 312 return true; 313 314 break; 315 } 316 return false; 317} 318 319/* 320 * Find the master net_device on top of the given net_device. 321 * @dev: base IPoIB net_device 322 * 323 * Returns the master net_device with a reference held, or the same net_device 324 * if no master exists. 325 */ 326static struct net_device *ipoib_get_master_net_dev(struct net_device *dev) 327{ 328 struct net_device *master; 329 330 rcu_read_lock(); 331 master = netdev_master_upper_dev_get_rcu(dev); 332 if (master) 333 dev_hold(master); 334 rcu_read_unlock(); 335 336 if (master) 337 return master; 338 339 dev_hold(dev); 340 return dev; 341} 342 343struct ipoib_walk_data { 344 const struct sockaddr *addr; 345 struct net_device *result; 346}; 347 348static int ipoib_upper_walk(struct net_device *upper, 349 struct netdev_nested_priv *priv) 350{ 351 struct ipoib_walk_data *data = (struct ipoib_walk_data *)priv->data; 352 int ret = 0; 353 354 if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) { 355 dev_hold(upper); 356 data->result = upper; 357 ret = 1; 358 } 359 360 return ret; 361} 362 363/** 364 * ipoib_get_net_dev_match_addr - Find a net_device matching 365 * the given address, which is an upper device of the given net_device. 366 * 367 * @addr: IP address to look for. 368 * @dev: base IPoIB net_device 369 * 370 * If found, returns the net_device with a reference held. Otherwise return 371 * NULL. 372 */ 373static struct net_device *ipoib_get_net_dev_match_addr( 374 const struct sockaddr *addr, struct net_device *dev) 375{ 376 struct netdev_nested_priv priv; 377 struct ipoib_walk_data data = { 378 .addr = addr, 379 }; 380 381 priv.data = (void *)&data; 382 rcu_read_lock(); 383 if (ipoib_is_dev_match_addr_rcu(addr, dev)) { 384 dev_hold(dev); 385 data.result = dev; 386 goto out; 387 } 388 389 netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &priv); 390out: 391 rcu_read_unlock(); 392 return data.result; 393} 394 395/* returns the number of IPoIB netdevs on top a given ipoib device matching a 396 * pkey_index and address, if one exists. 397 * 398 * @found_net_dev: contains a matching net_device if the return value >= 1, 399 * with a reference held. */ 400static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv, 401 const union ib_gid *gid, 402 u16 pkey_index, 403 const struct sockaddr *addr, 404 int nesting, 405 struct net_device **found_net_dev) 406{ 407 struct ipoib_dev_priv *child_priv; 408 struct net_device *net_dev = NULL; 409 int matches = 0; 410 411 if (priv->pkey_index == pkey_index && 412 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) { 413 if (!addr) { 414 net_dev = ipoib_get_master_net_dev(priv->dev); 415 } else { 416 /* Verify the net_device matches the IP address, as 417 * IPoIB child devices currently share a GID. */ 418 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev); 419 } 420 if (net_dev) { 421 if (!*found_net_dev) 422 *found_net_dev = net_dev; 423 else 424 dev_put(net_dev); 425 ++matches; 426 } 427 } 428 429 /* Check child interfaces */ 430 down_read_nested(&priv->vlan_rwsem, nesting); 431 list_for_each_entry(child_priv, &priv->child_intfs, list) { 432 matches += ipoib_match_gid_pkey_addr(child_priv, gid, 433 pkey_index, addr, 434 nesting + 1, 435 found_net_dev); 436 if (matches > 1) 437 break; 438 } 439 up_read(&priv->vlan_rwsem); 440 441 return matches; 442} 443 444/* Returns the number of matching net_devs found (between 0 and 2). Also 445 * return the matching net_device in the @net_dev parameter, holding a 446 * reference to the net_device, if the number of matches >= 1 */ 447static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u32 port, 448 u16 pkey_index, 449 const union ib_gid *gid, 450 const struct sockaddr *addr, 451 struct net_device **net_dev) 452{ 453 struct ipoib_dev_priv *priv; 454 int matches = 0; 455 456 *net_dev = NULL; 457 458 list_for_each_entry(priv, dev_list, list) { 459 if (priv->port != port) 460 continue; 461 462 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index, 463 addr, 0, net_dev); 464 if (matches > 1) 465 break; 466 } 467 468 return matches; 469} 470 471static struct net_device *ipoib_get_net_dev_by_params( 472 struct ib_device *dev, u32 port, u16 pkey, 473 const union ib_gid *gid, const struct sockaddr *addr, 474 void *client_data) 475{ 476 struct net_device *net_dev; 477 struct list_head *dev_list = client_data; 478 u16 pkey_index; 479 int matches; 480 int ret; 481 482 if (!rdma_protocol_ib(dev, port)) 483 return NULL; 484 485 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index); 486 if (ret) 487 return NULL; 488 489 /* See if we can find a unique device matching the L2 parameters */ 490 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, 491 gid, NULL, &net_dev); 492 493 switch (matches) { 494 case 0: 495 return NULL; 496 case 1: 497 return net_dev; 498 } 499 500 dev_put(net_dev); 501 502 /* Couldn't find a unique device with L2 parameters only. Use L3 503 * address to uniquely match the net device */ 504 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index, 505 gid, addr, &net_dev); 506 switch (matches) { 507 case 0: 508 return NULL; 509 default: 510 dev_warn_ratelimited(&dev->dev, 511 "duplicate IP address detected\n"); 512 fallthrough; 513 case 1: 514 return net_dev; 515 } 516} 517 518int ipoib_set_mode(struct net_device *dev, const char *buf) 519{ 520 struct ipoib_dev_priv *priv = ipoib_priv(dev); 521 522 if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) && 523 !strcmp(buf, "connected\n")) || 524 (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) && 525 !strcmp(buf, "datagram\n"))) { 526 return 0; 527 } 528 529 /* flush paths if we switch modes so that connections are restarted */ 530 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { 531 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 532 ipoib_warn(priv, "enabling connected mode " 533 "will cause multicast packet drops\n"); 534 netdev_update_features(dev); 535 dev_set_mtu(dev, ipoib_cm_max_mtu(dev)); 536 netif_set_real_num_tx_queues(dev, 1); 537 rtnl_unlock(); 538 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM; 539 540 ipoib_flush_paths(dev); 541 return (!rtnl_trylock()) ? -EBUSY : 0; 542 } 543 544 if (!strcmp(buf, "datagram\n")) { 545 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); 546 netdev_update_features(dev); 547 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu)); 548 netif_set_real_num_tx_queues(dev, dev->num_tx_queues); 549 rtnl_unlock(); 550 ipoib_flush_paths(dev); 551 return (!rtnl_trylock()) ? -EBUSY : 0; 552 } 553 554 return -EINVAL; 555} 556 557struct ipoib_path *__path_find(struct net_device *dev, void *gid) 558{ 559 struct ipoib_dev_priv *priv = ipoib_priv(dev); 560 struct rb_node *n = priv->path_tree.rb_node; 561 struct ipoib_path *path; 562 int ret; 563 564 while (n) { 565 path = rb_entry(n, struct ipoib_path, rb_node); 566 567 ret = memcmp(gid, path->pathrec.dgid.raw, 568 sizeof (union ib_gid)); 569 570 if (ret < 0) 571 n = n->rb_left; 572 else if (ret > 0) 573 n = n->rb_right; 574 else 575 return path; 576 } 577 578 return NULL; 579} 580 581static int __path_add(struct net_device *dev, struct ipoib_path *path) 582{ 583 struct ipoib_dev_priv *priv = ipoib_priv(dev); 584 struct rb_node **n = &priv->path_tree.rb_node; 585 struct rb_node *pn = NULL; 586 struct ipoib_path *tpath; 587 int ret; 588 589 while (*n) { 590 pn = *n; 591 tpath = rb_entry(pn, struct ipoib_path, rb_node); 592 593 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw, 594 sizeof (union ib_gid)); 595 if (ret < 0) 596 n = &pn->rb_left; 597 else if (ret > 0) 598 n = &pn->rb_right; 599 else 600 return -EEXIST; 601 } 602 603 rb_link_node(&path->rb_node, pn, n); 604 rb_insert_color(&path->rb_node, &priv->path_tree); 605 606 list_add_tail(&path->list, &priv->path_list); 607 608 return 0; 609} 610 611static void path_free(struct net_device *dev, struct ipoib_path *path) 612{ 613 struct sk_buff *skb; 614 615 while ((skb = __skb_dequeue(&path->queue))) 616 dev_kfree_skb_irq(skb); 617 618 ipoib_dbg(ipoib_priv(dev), "%s\n", __func__); 619 620 /* remove all neigh connected to this path */ 621 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 622 623 if (path->ah) 624 ipoib_put_ah(path->ah); 625 626 kfree(path); 627} 628 629#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 630 631struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev) 632{ 633 struct ipoib_path_iter *iter; 634 635 iter = kmalloc(sizeof(*iter), GFP_KERNEL); 636 if (!iter) 637 return NULL; 638 639 iter->dev = dev; 640 memset(iter->path.pathrec.dgid.raw, 0, 16); 641 642 if (ipoib_path_iter_next(iter)) { 643 kfree(iter); 644 return NULL; 645 } 646 647 return iter; 648} 649 650int ipoib_path_iter_next(struct ipoib_path_iter *iter) 651{ 652 struct ipoib_dev_priv *priv = ipoib_priv(iter->dev); 653 struct rb_node *n; 654 struct ipoib_path *path; 655 int ret = 1; 656 657 spin_lock_irq(&priv->lock); 658 659 n = rb_first(&priv->path_tree); 660 661 while (n) { 662 path = rb_entry(n, struct ipoib_path, rb_node); 663 664 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw, 665 sizeof (union ib_gid)) < 0) { 666 iter->path = *path; 667 ret = 0; 668 break; 669 } 670 671 n = rb_next(n); 672 } 673 674 spin_unlock_irq(&priv->lock); 675 676 return ret; 677} 678 679void ipoib_path_iter_read(struct ipoib_path_iter *iter, 680 struct ipoib_path *path) 681{ 682 *path = iter->path; 683} 684 685#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */ 686 687void ipoib_mark_paths_invalid(struct net_device *dev) 688{ 689 struct ipoib_dev_priv *priv = ipoib_priv(dev); 690 struct ipoib_path *path, *tp; 691 692 spin_lock_irq(&priv->lock); 693 694 list_for_each_entry_safe(path, tp, &priv->path_list, list) { 695 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n", 696 be32_to_cpu(sa_path_get_dlid(&path->pathrec)), 697 path->pathrec.dgid.raw); 698 if (path->ah) 699 path->ah->valid = 0; 700 } 701 702 spin_unlock_irq(&priv->lock); 703} 704 705static void push_pseudo_header(struct sk_buff *skb, const char *daddr) 706{ 707 struct ipoib_pseudo_header *phdr; 708 709 phdr = skb_push(skb, sizeof(*phdr)); 710 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN); 711} 712 713void ipoib_flush_paths(struct net_device *dev) 714{ 715 struct ipoib_dev_priv *priv = ipoib_priv(dev); 716 struct ipoib_path *path, *tp; 717 LIST_HEAD(remove_list); 718 unsigned long flags; 719 720 netif_tx_lock_bh(dev); 721 spin_lock_irqsave(&priv->lock, flags); 722 723 list_splice_init(&priv->path_list, &remove_list); 724 725 list_for_each_entry(path, &remove_list, list) 726 rb_erase(&path->rb_node, &priv->path_tree); 727 728 list_for_each_entry_safe(path, tp, &remove_list, list) { 729 if (path->query) 730 ib_sa_cancel_query(path->query_id, path->query); 731 spin_unlock_irqrestore(&priv->lock, flags); 732 netif_tx_unlock_bh(dev); 733 wait_for_completion(&path->done); 734 path_free(dev, path); 735 netif_tx_lock_bh(dev); 736 spin_lock_irqsave(&priv->lock, flags); 737 } 738 739 spin_unlock_irqrestore(&priv->lock, flags); 740 netif_tx_unlock_bh(dev); 741} 742 743static void path_rec_completion(int status, 744 struct sa_path_rec *pathrec, 745 unsigned int num_prs, void *path_ptr) 746{ 747 struct ipoib_path *path = path_ptr; 748 struct net_device *dev = path->dev; 749 struct ipoib_dev_priv *priv = ipoib_priv(dev); 750 struct ipoib_ah *ah = NULL; 751 struct ipoib_ah *old_ah = NULL; 752 struct ipoib_neigh *neigh, *tn; 753 struct sk_buff_head skqueue; 754 struct sk_buff *skb; 755 unsigned long flags; 756 757 if (!status) 758 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n", 759 be32_to_cpu(sa_path_get_dlid(pathrec)), 760 pathrec->dgid.raw); 761 else 762 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n", 763 status, path->pathrec.dgid.raw); 764 765 skb_queue_head_init(&skqueue); 766 767 if (!status) { 768 struct rdma_ah_attr av; 769 770 if (!ib_init_ah_attr_from_path(priv->ca, priv->port, 771 pathrec, &av, NULL)) { 772 ah = ipoib_create_ah(dev, priv->pd, &av); 773 rdma_destroy_ah_attr(&av); 774 } 775 } 776 777 spin_lock_irqsave(&priv->lock, flags); 778 779 if (!IS_ERR_OR_NULL(ah)) { 780 /* 781 * pathrec.dgid is used as the database key from the LLADDR, 782 * it must remain unchanged even if the SA returns a different 783 * GID to use in the AH. 784 */ 785 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw, 786 sizeof(union ib_gid))) { 787 ipoib_dbg( 788 priv, 789 "%s got PathRec for gid %pI6 while asked for %pI6\n", 790 dev->name, pathrec->dgid.raw, 791 path->pathrec.dgid.raw); 792 memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw, 793 sizeof(union ib_gid)); 794 } 795 796 path->pathrec = *pathrec; 797 798 old_ah = path->ah; 799 path->ah = ah; 800 801 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n", 802 ah, be32_to_cpu(sa_path_get_dlid(pathrec)), 803 pathrec->sl); 804 805 while ((skb = __skb_dequeue(&path->queue))) 806 __skb_queue_tail(&skqueue, skb); 807 808 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) { 809 if (neigh->ah) { 810 WARN_ON(neigh->ah != old_ah); 811 /* 812 * Dropping the ah reference inside 813 * priv->lock is safe here, because we 814 * will hold one more reference from 815 * the original value of path->ah (ie 816 * old_ah). 817 */ 818 ipoib_put_ah(neigh->ah); 819 } 820 kref_get(&path->ah->ref); 821 neigh->ah = path->ah; 822 823 if (ipoib_cm_enabled(dev, neigh->daddr)) { 824 if (!ipoib_cm_get(neigh)) 825 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, 826 path, 827 neigh)); 828 if (!ipoib_cm_get(neigh)) { 829 ipoib_neigh_free(neigh); 830 continue; 831 } 832 } 833 834 while ((skb = __skb_dequeue(&neigh->queue))) 835 __skb_queue_tail(&skqueue, skb); 836 } 837 path->ah->valid = 1; 838 } 839 840 path->query = NULL; 841 complete(&path->done); 842 843 spin_unlock_irqrestore(&priv->lock, flags); 844 845 if (IS_ERR_OR_NULL(ah)) 846 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw); 847 848 if (old_ah) 849 ipoib_put_ah(old_ah); 850 851 while ((skb = __skb_dequeue(&skqueue))) { 852 int ret; 853 skb->dev = dev; 854 ret = dev_queue_xmit(skb); 855 if (ret) 856 ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n", 857 __func__, ret); 858 } 859} 860 861static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path, 862 void *gid) 863{ 864 path->dev = priv->dev; 865 866 if (rdma_cap_opa_ah(priv->ca, priv->port)) 867 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA; 868 else 869 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB; 870 871 memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid)); 872 path->pathrec.sgid = priv->local_gid; 873 path->pathrec.pkey = cpu_to_be16(priv->pkey); 874 path->pathrec.numb_path = 1; 875 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class; 876} 877 878static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid) 879{ 880 struct ipoib_dev_priv *priv = ipoib_priv(dev); 881 struct ipoib_path *path; 882 883 if (!priv->broadcast) 884 return NULL; 885 886 path = kzalloc(sizeof(*path), GFP_ATOMIC); 887 if (!path) 888 return NULL; 889 890 skb_queue_head_init(&path->queue); 891 892 INIT_LIST_HEAD(&path->neigh_list); 893 894 init_path_rec(priv, path, gid); 895 896 return path; 897} 898 899static int path_rec_start(struct net_device *dev, 900 struct ipoib_path *path) 901{ 902 struct ipoib_dev_priv *priv = ipoib_priv(dev); 903 904 ipoib_dbg(priv, "Start path record lookup for %pI6\n", 905 path->pathrec.dgid.raw); 906 907 init_completion(&path->done); 908 909 path->query_id = 910 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port, 911 &path->pathrec, 912 IB_SA_PATH_REC_DGID | 913 IB_SA_PATH_REC_SGID | 914 IB_SA_PATH_REC_NUMB_PATH | 915 IB_SA_PATH_REC_TRAFFIC_CLASS | 916 IB_SA_PATH_REC_PKEY, 917 1000, GFP_ATOMIC, 918 path_rec_completion, 919 path, &path->query); 920 if (path->query_id < 0) { 921 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id); 922 path->query = NULL; 923 complete(&path->done); 924 return path->query_id; 925 } 926 927 return 0; 928} 929 930static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr, 931 struct net_device *dev) 932{ 933 struct ipoib_dev_priv *priv = ipoib_priv(dev); 934 struct ipoib_path *path; 935 unsigned long flags; 936 937 spin_lock_irqsave(&priv->lock, flags); 938 939 path = __path_find(dev, daddr + 4); 940 if (!path) 941 goto out; 942 if (!path->query) 943 path_rec_start(dev, path); 944out: 945 spin_unlock_irqrestore(&priv->lock, flags); 946} 947 948static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr, 949 struct net_device *dev) 950{ 951 struct ipoib_dev_priv *priv = ipoib_priv(dev); 952 struct rdma_netdev *rn = netdev_priv(dev); 953 struct ipoib_path *path; 954 struct ipoib_neigh *neigh; 955 unsigned long flags; 956 957 spin_lock_irqsave(&priv->lock, flags); 958 neigh = ipoib_neigh_alloc(daddr, dev); 959 if (!neigh) { 960 spin_unlock_irqrestore(&priv->lock, flags); 961 ++dev->stats.tx_dropped; 962 dev_kfree_skb_any(skb); 963 return NULL; 964 } 965 966 /* To avoid race condition, make sure that the 967 * neigh will be added only once. 968 */ 969 if (unlikely(!list_empty(&neigh->list))) { 970 spin_unlock_irqrestore(&priv->lock, flags); 971 return neigh; 972 } 973 974 path = __path_find(dev, daddr + 4); 975 if (!path) { 976 path = path_rec_create(dev, daddr + 4); 977 if (!path) 978 goto err_path; 979 980 __path_add(dev, path); 981 } 982 983 list_add_tail(&neigh->list, &path->neigh_list); 984 985 if (path->ah && path->ah->valid) { 986 kref_get(&path->ah->ref); 987 neigh->ah = path->ah; 988 989 if (ipoib_cm_enabled(dev, neigh->daddr)) { 990 if (!ipoib_cm_get(neigh)) 991 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh)); 992 if (!ipoib_cm_get(neigh)) { 993 ipoib_neigh_free(neigh); 994 goto err_drop; 995 } 996 if (skb_queue_len(&neigh->queue) < 997 IPOIB_MAX_PATH_REC_QUEUE) { 998 push_pseudo_header(skb, neigh->daddr); 999 __skb_queue_tail(&neigh->queue, skb); 1000 } else { 1001 ipoib_warn(priv, "queue length limit %d. Packet drop.\n", 1002 skb_queue_len(&neigh->queue)); 1003 goto err_drop; 1004 } 1005 } else { 1006 spin_unlock_irqrestore(&priv->lock, flags); 1007 path->ah->last_send = rn->send(dev, skb, path->ah->ah, 1008 IPOIB_QPN(daddr)); 1009 ipoib_neigh_put(neigh); 1010 return NULL; 1011 } 1012 } else { 1013 neigh->ah = NULL; 1014 1015 if (!path->query && path_rec_start(dev, path)) 1016 goto err_path; 1017 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1018 push_pseudo_header(skb, neigh->daddr); 1019 __skb_queue_tail(&neigh->queue, skb); 1020 } else { 1021 goto err_drop; 1022 } 1023 } 1024 1025 spin_unlock_irqrestore(&priv->lock, flags); 1026 ipoib_neigh_put(neigh); 1027 return NULL; 1028 1029err_path: 1030 ipoib_neigh_free(neigh); 1031err_drop: 1032 ++dev->stats.tx_dropped; 1033 dev_kfree_skb_any(skb); 1034 1035 spin_unlock_irqrestore(&priv->lock, flags); 1036 ipoib_neigh_put(neigh); 1037 1038 return NULL; 1039} 1040 1041static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev, 1042 struct ipoib_pseudo_header *phdr) 1043{ 1044 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1045 struct rdma_netdev *rn = netdev_priv(dev); 1046 struct ipoib_path *path; 1047 unsigned long flags; 1048 1049 spin_lock_irqsave(&priv->lock, flags); 1050 1051 /* no broadcast means that all paths are (going to be) not valid */ 1052 if (!priv->broadcast) 1053 goto drop_and_unlock; 1054 1055 path = __path_find(dev, phdr->hwaddr + 4); 1056 if (!path || !path->ah || !path->ah->valid) { 1057 if (!path) { 1058 path = path_rec_create(dev, phdr->hwaddr + 4); 1059 if (!path) 1060 goto drop_and_unlock; 1061 __path_add(dev, path); 1062 } else { 1063 /* 1064 * make sure there are no changes in the existing 1065 * path record 1066 */ 1067 init_path_rec(priv, path, phdr->hwaddr + 4); 1068 } 1069 if (!path->query && path_rec_start(dev, path)) { 1070 goto drop_and_unlock; 1071 } 1072 1073 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1074 push_pseudo_header(skb, phdr->hwaddr); 1075 __skb_queue_tail(&path->queue, skb); 1076 goto unlock; 1077 } else { 1078 goto drop_and_unlock; 1079 } 1080 } 1081 1082 spin_unlock_irqrestore(&priv->lock, flags); 1083 ipoib_dbg(priv, "Send unicast ARP to %08x\n", 1084 be32_to_cpu(sa_path_get_dlid(&path->pathrec))); 1085 path->ah->last_send = rn->send(dev, skb, path->ah->ah, 1086 IPOIB_QPN(phdr->hwaddr)); 1087 return; 1088 1089drop_and_unlock: 1090 ++dev->stats.tx_dropped; 1091 dev_kfree_skb_any(skb); 1092unlock: 1093 spin_unlock_irqrestore(&priv->lock, flags); 1094} 1095 1096static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev) 1097{ 1098 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1099 struct rdma_netdev *rn = netdev_priv(dev); 1100 struct ipoib_neigh *neigh; 1101 struct ipoib_pseudo_header *phdr; 1102 struct ipoib_header *header; 1103 unsigned long flags; 1104 1105 phdr = (struct ipoib_pseudo_header *) skb->data; 1106 skb_pull(skb, sizeof(*phdr)); 1107 header = (struct ipoib_header *) skb->data; 1108 1109 if (unlikely(phdr->hwaddr[4] == 0xff)) { 1110 /* multicast, arrange "if" according to probability */ 1111 if ((header->proto != htons(ETH_P_IP)) && 1112 (header->proto != htons(ETH_P_IPV6)) && 1113 (header->proto != htons(ETH_P_ARP)) && 1114 (header->proto != htons(ETH_P_RARP)) && 1115 (header->proto != htons(ETH_P_TIPC))) { 1116 /* ethertype not supported by IPoIB */ 1117 ++dev->stats.tx_dropped; 1118 dev_kfree_skb_any(skb); 1119 return NETDEV_TX_OK; 1120 } 1121 /* Add in the P_Key for multicast*/ 1122 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff; 1123 phdr->hwaddr[9] = priv->pkey & 0xff; 1124 1125 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1126 if (likely(neigh)) 1127 goto send_using_neigh; 1128 ipoib_mcast_send(dev, phdr->hwaddr, skb); 1129 return NETDEV_TX_OK; 1130 } 1131 1132 /* unicast, arrange "switch" according to probability */ 1133 switch (header->proto) { 1134 case htons(ETH_P_IP): 1135 case htons(ETH_P_IPV6): 1136 case htons(ETH_P_TIPC): 1137 neigh = ipoib_neigh_get(dev, phdr->hwaddr); 1138 if (unlikely(!neigh)) { 1139 neigh = neigh_add_path(skb, phdr->hwaddr, dev); 1140 if (likely(!neigh)) 1141 return NETDEV_TX_OK; 1142 } 1143 break; 1144 case htons(ETH_P_ARP): 1145 case htons(ETH_P_RARP): 1146 /* for unicast ARP and RARP should always perform path find */ 1147 unicast_arp_send(skb, dev, phdr); 1148 return NETDEV_TX_OK; 1149 default: 1150 /* ethertype not supported by IPoIB */ 1151 ++dev->stats.tx_dropped; 1152 dev_kfree_skb_any(skb); 1153 return NETDEV_TX_OK; 1154 } 1155 1156send_using_neigh: 1157 /* note we now hold a ref to neigh */ 1158 if (ipoib_cm_get(neigh)) { 1159 if (ipoib_cm_up(neigh)) { 1160 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh)); 1161 goto unref; 1162 } 1163 } else if (neigh->ah && neigh->ah->valid) { 1164 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah, 1165 IPOIB_QPN(phdr->hwaddr)); 1166 goto unref; 1167 } else if (neigh->ah) { 1168 neigh_refresh_path(neigh, phdr->hwaddr, dev); 1169 } 1170 1171 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) { 1172 push_pseudo_header(skb, phdr->hwaddr); 1173 spin_lock_irqsave(&priv->lock, flags); 1174 __skb_queue_tail(&neigh->queue, skb); 1175 spin_unlock_irqrestore(&priv->lock, flags); 1176 } else { 1177 ++dev->stats.tx_dropped; 1178 dev_kfree_skb_any(skb); 1179 } 1180 1181unref: 1182 ipoib_neigh_put(neigh); 1183 1184 return NETDEV_TX_OK; 1185} 1186 1187static void ipoib_timeout(struct net_device *dev, unsigned int txqueue) 1188{ 1189 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1190 struct rdma_netdev *rn = netdev_priv(dev); 1191 1192 if (rn->tx_timeout) { 1193 rn->tx_timeout(dev, txqueue); 1194 return; 1195 } 1196 ipoib_warn(priv, "transmit timeout: latency %d msecs\n", 1197 jiffies_to_msecs(jiffies - dev_trans_start(dev))); 1198 ipoib_warn(priv, 1199 "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n", 1200 netif_queue_stopped(dev), priv->tx_head, priv->tx_tail, 1201 priv->global_tx_head, priv->global_tx_tail); 1202 1203 1204 schedule_work(&priv->tx_timeout_work); 1205} 1206 1207void ipoib_ib_tx_timeout_work(struct work_struct *work) 1208{ 1209 struct ipoib_dev_priv *priv = container_of(work, 1210 struct ipoib_dev_priv, 1211 tx_timeout_work); 1212 int err; 1213 1214 rtnl_lock(); 1215 1216 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) 1217 goto unlock; 1218 1219 ipoib_stop(priv->dev); 1220 err = ipoib_open(priv->dev); 1221 if (err) { 1222 ipoib_warn(priv, "ipoib_open failed recovering from a tx_timeout, err(%d).\n", 1223 err); 1224 goto unlock; 1225 } 1226 1227 netif_tx_wake_all_queues(priv->dev); 1228unlock: 1229 rtnl_unlock(); 1230 1231} 1232 1233static int ipoib_hard_header(struct sk_buff *skb, 1234 struct net_device *dev, 1235 unsigned short type, 1236 const void *daddr, 1237 const void *saddr, 1238 unsigned int len) 1239{ 1240 struct ipoib_header *header; 1241 1242 header = skb_push(skb, sizeof(*header)); 1243 1244 header->proto = htons(type); 1245 header->reserved = 0; 1246 1247 /* 1248 * we don't rely on dst_entry structure, always stuff the 1249 * destination address into skb hard header so we can figure out where 1250 * to send the packet later. 1251 */ 1252 push_pseudo_header(skb, daddr); 1253 1254 return IPOIB_HARD_LEN; 1255} 1256 1257static void ipoib_set_mcast_list(struct net_device *dev) 1258{ 1259 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1260 1261 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) { 1262 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set"); 1263 return; 1264 } 1265 1266 queue_work(priv->wq, &priv->restart_task); 1267} 1268 1269static int ipoib_get_iflink(const struct net_device *dev) 1270{ 1271 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1272 1273 /* parent interface */ 1274 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) 1275 return READ_ONCE(dev->ifindex); 1276 1277 /* child/vlan interface */ 1278 return READ_ONCE(priv->parent->ifindex); 1279} 1280 1281static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr) 1282{ 1283 /* 1284 * Use only the address parts that contributes to spreading 1285 * The subnet prefix is not used as one can not connect to 1286 * same remote port (GUID) using the same remote QPN via two 1287 * different subnets. 1288 */ 1289 /* qpn octets[1:4) & port GUID octets[12:20) */ 1290 u32 *d32 = (u32 *) daddr; 1291 u32 hv; 1292 1293 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0); 1294 return hv & htbl->mask; 1295} 1296 1297struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr) 1298{ 1299 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1300 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1301 struct ipoib_neigh_hash *htbl; 1302 struct ipoib_neigh *neigh = NULL; 1303 u32 hash_val; 1304 1305 rcu_read_lock_bh(); 1306 1307 htbl = rcu_dereference_bh(ntbl->htbl); 1308 1309 if (!htbl) 1310 goto out_unlock; 1311 1312 hash_val = ipoib_addr_hash(htbl, daddr); 1313 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]); 1314 neigh != NULL; 1315 neigh = rcu_dereference_bh(neigh->hnext)) { 1316 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1317 /* found, take one ref on behalf of the caller */ 1318 if (!refcount_inc_not_zero(&neigh->refcnt)) { 1319 /* deleted */ 1320 neigh = NULL; 1321 goto out_unlock; 1322 } 1323 1324 if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)) 1325 neigh->alive = jiffies; 1326 goto out_unlock; 1327 } 1328 } 1329 1330out_unlock: 1331 rcu_read_unlock_bh(); 1332 return neigh; 1333} 1334 1335static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv) 1336{ 1337 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1338 struct ipoib_neigh_hash *htbl; 1339 unsigned long neigh_obsolete; 1340 unsigned long dt; 1341 unsigned long flags; 1342 int i; 1343 LIST_HEAD(remove_list); 1344 1345 spin_lock_irqsave(&priv->lock, flags); 1346 1347 htbl = rcu_dereference_protected(ntbl->htbl, 1348 lockdep_is_held(&priv->lock)); 1349 1350 if (!htbl) 1351 goto out_unlock; 1352 1353 /* neigh is obsolete if it was idle for two GC periods */ 1354 dt = 2 * arp_tbl.gc_interval; 1355 neigh_obsolete = jiffies - dt; 1356 1357 for (i = 0; i < htbl->size; i++) { 1358 struct ipoib_neigh *neigh; 1359 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1360 1361 while ((neigh = rcu_dereference_protected(*np, 1362 lockdep_is_held(&priv->lock))) != NULL) { 1363 /* was the neigh idle for two GC periods */ 1364 if (time_after(neigh_obsolete, neigh->alive)) { 1365 1366 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list); 1367 1368 rcu_assign_pointer(*np, 1369 rcu_dereference_protected(neigh->hnext, 1370 lockdep_is_held(&priv->lock))); 1371 /* remove from path/mc list */ 1372 list_del_init(&neigh->list); 1373 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1374 } else { 1375 np = &neigh->hnext; 1376 } 1377 1378 } 1379 } 1380 1381out_unlock: 1382 spin_unlock_irqrestore(&priv->lock, flags); 1383 ipoib_mcast_remove_list(&remove_list); 1384} 1385 1386static void ipoib_reap_neigh(struct work_struct *work) 1387{ 1388 struct ipoib_dev_priv *priv = 1389 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work); 1390 1391 __ipoib_reap_neigh(priv); 1392 1393 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1394 arp_tbl.gc_interval); 1395} 1396 1397 1398static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr, 1399 struct net_device *dev) 1400{ 1401 struct ipoib_neigh *neigh; 1402 1403 neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC); 1404 if (!neigh) 1405 return NULL; 1406 1407 neigh->dev = dev; 1408 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr)); 1409 skb_queue_head_init(&neigh->queue); 1410 INIT_LIST_HEAD(&neigh->list); 1411 ipoib_cm_set(neigh, NULL); 1412 /* one ref on behalf of the caller */ 1413 refcount_set(&neigh->refcnt, 1); 1414 1415 return neigh; 1416} 1417 1418struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr, 1419 struct net_device *dev) 1420{ 1421 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1422 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1423 struct ipoib_neigh_hash *htbl; 1424 struct ipoib_neigh *neigh; 1425 u32 hash_val; 1426 1427 htbl = rcu_dereference_protected(ntbl->htbl, 1428 lockdep_is_held(&priv->lock)); 1429 if (!htbl) { 1430 neigh = NULL; 1431 goto out_unlock; 1432 } 1433 1434 /* need to add a new neigh, but maybe some other thread succeeded? 1435 * recalc hash, maybe hash resize took place so we do a search 1436 */ 1437 hash_val = ipoib_addr_hash(htbl, daddr); 1438 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val], 1439 lockdep_is_held(&priv->lock)); 1440 neigh != NULL; 1441 neigh = rcu_dereference_protected(neigh->hnext, 1442 lockdep_is_held(&priv->lock))) { 1443 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) { 1444 /* found, take one ref on behalf of the caller */ 1445 if (!refcount_inc_not_zero(&neigh->refcnt)) { 1446 /* deleted */ 1447 neigh = NULL; 1448 break; 1449 } 1450 neigh->alive = jiffies; 1451 goto out_unlock; 1452 } 1453 } 1454 1455 neigh = ipoib_neigh_ctor(daddr, dev); 1456 if (!neigh) 1457 goto out_unlock; 1458 1459 /* one ref on behalf of the hash table */ 1460 refcount_inc(&neigh->refcnt); 1461 neigh->alive = jiffies; 1462 /* put in hash */ 1463 rcu_assign_pointer(neigh->hnext, 1464 rcu_dereference_protected(htbl->buckets[hash_val], 1465 lockdep_is_held(&priv->lock))); 1466 rcu_assign_pointer(htbl->buckets[hash_val], neigh); 1467 atomic_inc(&ntbl->entries); 1468 1469out_unlock: 1470 1471 return neigh; 1472} 1473 1474void ipoib_neigh_dtor(struct ipoib_neigh *neigh) 1475{ 1476 /* neigh reference count was dropprd to zero */ 1477 struct net_device *dev = neigh->dev; 1478 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1479 struct sk_buff *skb; 1480 if (neigh->ah) 1481 ipoib_put_ah(neigh->ah); 1482 while ((skb = __skb_dequeue(&neigh->queue))) { 1483 ++dev->stats.tx_dropped; 1484 dev_kfree_skb_any(skb); 1485 } 1486 if (ipoib_cm_get(neigh)) 1487 ipoib_cm_destroy_tx(ipoib_cm_get(neigh)); 1488 ipoib_dbg(ipoib_priv(dev), 1489 "neigh free for %06x %pI6\n", 1490 IPOIB_QPN(neigh->daddr), 1491 neigh->daddr + 4); 1492 kfree(neigh); 1493 if (atomic_dec_and_test(&priv->ntbl.entries)) { 1494 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags)) 1495 complete(&priv->ntbl.flushed); 1496 } 1497} 1498 1499static void ipoib_neigh_reclaim(struct rcu_head *rp) 1500{ 1501 /* Called as a result of removal from hash table */ 1502 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu); 1503 /* note TX context may hold another ref */ 1504 ipoib_neigh_put(neigh); 1505} 1506 1507void ipoib_neigh_free(struct ipoib_neigh *neigh) 1508{ 1509 struct net_device *dev = neigh->dev; 1510 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1511 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1512 struct ipoib_neigh_hash *htbl; 1513 struct ipoib_neigh __rcu **np; 1514 struct ipoib_neigh *n; 1515 u32 hash_val; 1516 1517 htbl = rcu_dereference_protected(ntbl->htbl, 1518 lockdep_is_held(&priv->lock)); 1519 if (!htbl) 1520 return; 1521 1522 hash_val = ipoib_addr_hash(htbl, neigh->daddr); 1523 np = &htbl->buckets[hash_val]; 1524 for (n = rcu_dereference_protected(*np, 1525 lockdep_is_held(&priv->lock)); 1526 n != NULL; 1527 n = rcu_dereference_protected(*np, 1528 lockdep_is_held(&priv->lock))) { 1529 if (n == neigh) { 1530 /* found */ 1531 rcu_assign_pointer(*np, 1532 rcu_dereference_protected(neigh->hnext, 1533 lockdep_is_held(&priv->lock))); 1534 /* remove from parent list */ 1535 list_del_init(&neigh->list); 1536 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1537 return; 1538 } else { 1539 np = &n->hnext; 1540 } 1541 } 1542} 1543 1544static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv) 1545{ 1546 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1547 struct ipoib_neigh_hash *htbl; 1548 struct ipoib_neigh __rcu **buckets; 1549 u32 size; 1550 1551 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1552 ntbl->htbl = NULL; 1553 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL); 1554 if (!htbl) 1555 return -ENOMEM; 1556 size = roundup_pow_of_two(arp_tbl.gc_thresh3); 1557 buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL); 1558 if (!buckets) { 1559 kfree(htbl); 1560 return -ENOMEM; 1561 } 1562 htbl->size = size; 1563 htbl->mask = (size - 1); 1564 htbl->buckets = buckets; 1565 RCU_INIT_POINTER(ntbl->htbl, htbl); 1566 htbl->ntbl = ntbl; 1567 atomic_set(&ntbl->entries, 0); 1568 1569 /* start garbage collection */ 1570 queue_delayed_work(priv->wq, &priv->neigh_reap_task, 1571 arp_tbl.gc_interval); 1572 1573 return 0; 1574} 1575 1576static void neigh_hash_free_rcu(struct rcu_head *head) 1577{ 1578 struct ipoib_neigh_hash *htbl = container_of(head, 1579 struct ipoib_neigh_hash, 1580 rcu); 1581 struct ipoib_neigh __rcu **buckets = htbl->buckets; 1582 struct ipoib_neigh_table *ntbl = htbl->ntbl; 1583 1584 kvfree(buckets); 1585 kfree(htbl); 1586 complete(&ntbl->deleted); 1587} 1588 1589void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid) 1590{ 1591 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1592 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1593 struct ipoib_neigh_hash *htbl; 1594 unsigned long flags; 1595 int i; 1596 1597 /* remove all neigh connected to a given path or mcast */ 1598 spin_lock_irqsave(&priv->lock, flags); 1599 1600 htbl = rcu_dereference_protected(ntbl->htbl, 1601 lockdep_is_held(&priv->lock)); 1602 1603 if (!htbl) 1604 goto out_unlock; 1605 1606 for (i = 0; i < htbl->size; i++) { 1607 struct ipoib_neigh *neigh; 1608 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1609 1610 while ((neigh = rcu_dereference_protected(*np, 1611 lockdep_is_held(&priv->lock))) != NULL) { 1612 /* delete neighs belong to this parent */ 1613 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) { 1614 rcu_assign_pointer(*np, 1615 rcu_dereference_protected(neigh->hnext, 1616 lockdep_is_held(&priv->lock))); 1617 /* remove from parent list */ 1618 list_del_init(&neigh->list); 1619 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1620 } else { 1621 np = &neigh->hnext; 1622 } 1623 1624 } 1625 } 1626out_unlock: 1627 spin_unlock_irqrestore(&priv->lock, flags); 1628} 1629 1630static void ipoib_flush_neighs(struct ipoib_dev_priv *priv) 1631{ 1632 struct ipoib_neigh_table *ntbl = &priv->ntbl; 1633 struct ipoib_neigh_hash *htbl; 1634 unsigned long flags; 1635 int i, wait_flushed = 0; 1636 1637 init_completion(&priv->ntbl.flushed); 1638 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags); 1639 1640 spin_lock_irqsave(&priv->lock, flags); 1641 1642 htbl = rcu_dereference_protected(ntbl->htbl, 1643 lockdep_is_held(&priv->lock)); 1644 if (!htbl) 1645 goto out_unlock; 1646 1647 wait_flushed = atomic_read(&priv->ntbl.entries); 1648 if (!wait_flushed) 1649 goto free_htbl; 1650 1651 for (i = 0; i < htbl->size; i++) { 1652 struct ipoib_neigh *neigh; 1653 struct ipoib_neigh __rcu **np = &htbl->buckets[i]; 1654 1655 while ((neigh = rcu_dereference_protected(*np, 1656 lockdep_is_held(&priv->lock))) != NULL) { 1657 rcu_assign_pointer(*np, 1658 rcu_dereference_protected(neigh->hnext, 1659 lockdep_is_held(&priv->lock))); 1660 /* remove from path/mc list */ 1661 list_del_init(&neigh->list); 1662 call_rcu(&neigh->rcu, ipoib_neigh_reclaim); 1663 } 1664 } 1665 1666free_htbl: 1667 rcu_assign_pointer(ntbl->htbl, NULL); 1668 call_rcu(&htbl->rcu, neigh_hash_free_rcu); 1669 1670out_unlock: 1671 spin_unlock_irqrestore(&priv->lock, flags); 1672 if (wait_flushed) 1673 wait_for_completion(&priv->ntbl.flushed); 1674} 1675 1676static void ipoib_neigh_hash_uninit(struct net_device *dev) 1677{ 1678 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1679 1680 ipoib_dbg(priv, "%s\n", __func__); 1681 init_completion(&priv->ntbl.deleted); 1682 1683 cancel_delayed_work_sync(&priv->neigh_reap_task); 1684 1685 ipoib_flush_neighs(priv); 1686 1687 wait_for_completion(&priv->ntbl.deleted); 1688} 1689 1690static void ipoib_napi_add(struct net_device *dev) 1691{ 1692 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1693 1694 netif_napi_add_weight(dev, &priv->recv_napi, ipoib_rx_poll, 1695 IPOIB_NUM_WC); 1696 netif_napi_add_weight(dev, &priv->send_napi, ipoib_tx_poll, 1697 MAX_SEND_CQE); 1698} 1699 1700static void ipoib_napi_del(struct net_device *dev) 1701{ 1702 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1703 1704 netif_napi_del(&priv->recv_napi); 1705 netif_napi_del(&priv->send_napi); 1706} 1707 1708static void ipoib_dev_uninit_default(struct net_device *dev) 1709{ 1710 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1711 1712 ipoib_transport_dev_cleanup(dev); 1713 1714 ipoib_napi_del(dev); 1715 1716 ipoib_cm_dev_cleanup(dev); 1717 1718 kfree(priv->rx_ring); 1719 vfree(priv->tx_ring); 1720 1721 priv->rx_ring = NULL; 1722 priv->tx_ring = NULL; 1723} 1724 1725static int ipoib_dev_init_default(struct net_device *dev) 1726{ 1727 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1728 u8 addr_mod[3]; 1729 1730 ipoib_napi_add(dev); 1731 1732 /* Allocate RX/TX "rings" to hold queued skbs */ 1733 priv->rx_ring = kcalloc(ipoib_recvq_size, 1734 sizeof(*priv->rx_ring), 1735 GFP_KERNEL); 1736 if (!priv->rx_ring) 1737 goto out; 1738 1739 priv->tx_ring = vzalloc(array_size(ipoib_sendq_size, 1740 sizeof(*priv->tx_ring))); 1741 if (!priv->tx_ring) { 1742 pr_warn("%s: failed to allocate TX ring (%d entries)\n", 1743 priv->ca->name, ipoib_sendq_size); 1744 goto out_rx_ring_cleanup; 1745 } 1746 1747 /* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */ 1748 1749 if (ipoib_transport_dev_init(dev, priv->ca)) { 1750 pr_warn("%s: ipoib_transport_dev_init failed\n", 1751 priv->ca->name); 1752 goto out_tx_ring_cleanup; 1753 } 1754 1755 /* after qp created set dev address */ 1756 addr_mod[0] = (priv->qp->qp_num >> 16) & 0xff; 1757 addr_mod[1] = (priv->qp->qp_num >> 8) & 0xff; 1758 addr_mod[2] = (priv->qp->qp_num) & 0xff; 1759 dev_addr_mod(priv->dev, 1, addr_mod, sizeof(addr_mod)); 1760 1761 return 0; 1762 1763out_tx_ring_cleanup: 1764 vfree(priv->tx_ring); 1765 1766out_rx_ring_cleanup: 1767 kfree(priv->rx_ring); 1768 1769out: 1770 ipoib_napi_del(dev); 1771 return -ENOMEM; 1772} 1773 1774static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr, 1775 int cmd) 1776{ 1777 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1778 1779 if (!priv->rn_ops->ndo_eth_ioctl) 1780 return -EOPNOTSUPP; 1781 1782 return priv->rn_ops->ndo_eth_ioctl(dev, ifr, cmd); 1783} 1784 1785static int ipoib_dev_init(struct net_device *dev) 1786{ 1787 struct ipoib_dev_priv *priv = ipoib_priv(dev); 1788 int ret = -ENOMEM; 1789 1790 priv->qp = NULL; 1791 1792 /* 1793 * the various IPoIB tasks assume they will never race against 1794 * themselves, so always use a single thread workqueue 1795 */ 1796 priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM); 1797 if (!priv->wq) { 1798 pr_warn("%s: failed to allocate device WQ\n", dev->name); 1799 goto out; 1800 } 1801 1802 /* create pd, which used both for control and datapath*/ 1803 priv->pd = ib_alloc_pd(priv->ca, 0); 1804 if (IS_ERR(priv->pd)) { 1805 pr_warn("%s: failed to allocate PD\n", priv->ca->name); 1806 goto clean_wq; 1807 } 1808 1809 ret = priv->rn_ops->ndo_init(dev); 1810 if (ret) { 1811 pr_warn("%s failed to init HW resource\n", dev->name); 1812 goto out_free_pd; 1813 } 1814 1815 ret = ipoib_neigh_hash_init(priv); 1816 if (ret) { 1817 pr_warn("%s failed to init neigh hash\n", dev->name); 1818 goto out_dev_uninit; 1819 } 1820 1821 if (dev->flags & IFF_UP) { 1822 if (ipoib_ib_dev_open(dev)) { 1823 pr_warn("%s failed to open device\n", dev->name); 1824 ret = -ENODEV; 1825 goto out_hash_uninit; 1826 } 1827 } 1828 1829 return 0; 1830 1831out_hash_uninit: 1832 ipoib_neigh_hash_uninit(dev); 1833 1834out_dev_uninit: 1835 ipoib_ib_dev_cleanup(dev); 1836 1837out_free_pd: 1838 if (priv->pd) { 1839 ib_dealloc_pd(priv->pd); 1840 priv->pd = NULL; 1841 } 1842 1843clean_wq: 1844 if (priv->wq) { 1845 destroy_workqueue(priv->wq); 1846 priv->wq = NULL; 1847 } 1848 1849out: 1850 return ret; 1851} 1852 1853/* 1854 * This must be called before doing an unregister_netdev on a parent device to 1855 * shutdown the IB event handler. 1856 */ 1857static void ipoib_parent_unregister_pre(struct net_device *ndev) 1858{ 1859 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 1860 1861 /* 1862 * ipoib_set_mac checks netif_running before pushing work, clearing 1863 * running ensures the it will not add more work. 1864 */ 1865 rtnl_lock(); 1866 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL); 1867 rtnl_unlock(); 1868 1869 /* ipoib_event() cannot be running once this returns */ 1870 ib_unregister_event_handler(&priv->event_handler); 1871 1872 /* 1873 * Work on the queue grabs the rtnl lock, so this cannot be done while 1874 * also holding it. 1875 */ 1876 flush_workqueue(ipoib_workqueue); 1877} 1878 1879static void ipoib_set_dev_features(struct ipoib_dev_priv *priv) 1880{ 1881 priv->hca_caps = priv->ca->attrs.device_cap_flags; 1882 priv->kernel_caps = priv->ca->attrs.kernel_cap_flags; 1883 1884 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) { 1885 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM; 1886 1887 if (priv->kernel_caps & IBK_UD_TSO) 1888 priv->dev->hw_features |= NETIF_F_TSO; 1889 1890 priv->dev->features |= priv->dev->hw_features; 1891 } 1892} 1893 1894static int ipoib_parent_init(struct net_device *ndev) 1895{ 1896 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 1897 struct ib_port_attr attr; 1898 int result; 1899 1900 result = ib_query_port(priv->ca, priv->port, &attr); 1901 if (result) { 1902 pr_warn("%s: ib_query_port %d failed\n", priv->ca->name, 1903 priv->port); 1904 return result; 1905 } 1906 priv->max_ib_mtu = rdma_mtu_from_attr(priv->ca, priv->port, &attr); 1907 1908 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey); 1909 if (result) { 1910 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n", 1911 priv->ca->name, priv->port, result); 1912 return result; 1913 } 1914 1915 result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid); 1916 if (result) { 1917 pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n", 1918 priv->ca->name, priv->port, result); 1919 return result; 1920 } 1921 dev_addr_mod(priv->dev, 4, priv->local_gid.raw, sizeof(union ib_gid)); 1922 1923 SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent); 1924 priv->dev->dev_port = priv->port - 1; 1925 /* Let's set this one too for backwards compatibility. */ 1926 priv->dev->dev_id = priv->port - 1; 1927 1928 return 0; 1929} 1930 1931static void ipoib_child_init(struct net_device *ndev) 1932{ 1933 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 1934 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); 1935 1936 priv->max_ib_mtu = ppriv->max_ib_mtu; 1937 set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags); 1938 if (memchr_inv(priv->dev->dev_addr, 0, INFINIBAND_ALEN)) 1939 memcpy(&priv->local_gid, priv->dev->dev_addr + 4, 1940 sizeof(priv->local_gid)); 1941 else { 1942 __dev_addr_set(priv->dev, ppriv->dev->dev_addr, 1943 INFINIBAND_ALEN); 1944 memcpy(&priv->local_gid, &ppriv->local_gid, 1945 sizeof(priv->local_gid)); 1946 } 1947} 1948 1949static int ipoib_ndo_init(struct net_device *ndev) 1950{ 1951 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 1952 int rc; 1953 struct rdma_netdev *rn = netdev_priv(ndev); 1954 1955 if (priv->parent) { 1956 ipoib_child_init(ndev); 1957 } else { 1958 rc = ipoib_parent_init(ndev); 1959 if (rc) 1960 return rc; 1961 } 1962 1963 /* MTU will be reset when mcast join happens */ 1964 ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu); 1965 priv->mcast_mtu = priv->admin_mtu = ndev->mtu; 1966 rn->mtu = priv->mcast_mtu; 1967 ndev->max_mtu = IPOIB_CM_MTU; 1968 1969 ndev->neigh_priv_len = sizeof(struct ipoib_neigh); 1970 1971 /* 1972 * Set the full membership bit, so that we join the right 1973 * broadcast group, etc. 1974 */ 1975 priv->pkey |= 0x8000; 1976 1977 ndev->broadcast[8] = priv->pkey >> 8; 1978 ndev->broadcast[9] = priv->pkey & 0xff; 1979 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 1980 1981 ipoib_set_dev_features(priv); 1982 1983 rc = ipoib_dev_init(ndev); 1984 if (rc) { 1985 pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n", 1986 priv->ca->name, priv->dev->name, priv->port, rc); 1987 return rc; 1988 } 1989 1990 if (priv->parent) { 1991 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); 1992 1993 dev_hold(priv->parent); 1994 1995 down_write(&ppriv->vlan_rwsem); 1996 list_add_tail(&priv->list, &ppriv->child_intfs); 1997 up_write(&ppriv->vlan_rwsem); 1998 } 1999 2000 return 0; 2001} 2002 2003static void ipoib_ndo_uninit(struct net_device *dev) 2004{ 2005 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2006 2007 ASSERT_RTNL(); 2008 2009 /* 2010 * ipoib_remove_one guarantees the children are removed before the 2011 * parent, and that is the only place where a parent can be removed. 2012 */ 2013 WARN_ON(!list_empty(&priv->child_intfs)); 2014 2015 if (priv->parent) { 2016 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); 2017 2018 down_write(&ppriv->vlan_rwsem); 2019 list_del(&priv->list); 2020 up_write(&ppriv->vlan_rwsem); 2021 } 2022 2023 ipoib_neigh_hash_uninit(dev); 2024 2025 ipoib_ib_dev_cleanup(dev); 2026 2027 /* no more works over the priv->wq */ 2028 if (priv->wq) { 2029 /* See ipoib_mcast_carrier_on_task() */ 2030 WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)); 2031 destroy_workqueue(priv->wq); 2032 priv->wq = NULL; 2033 } 2034 2035 dev_put(priv->parent); 2036} 2037 2038static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state) 2039{ 2040 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2041 2042 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state); 2043} 2044 2045static int ipoib_get_vf_config(struct net_device *dev, int vf, 2046 struct ifla_vf_info *ivf) 2047{ 2048 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2049 int err; 2050 2051 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf); 2052 if (err) 2053 return err; 2054 2055 ivf->vf = vf; 2056 memcpy(ivf->mac, dev->dev_addr, dev->addr_len); 2057 2058 return 0; 2059} 2060 2061static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type) 2062{ 2063 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2064 2065 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID) 2066 return -EINVAL; 2067 2068 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type); 2069} 2070 2071static int ipoib_get_vf_guid(struct net_device *dev, int vf, 2072 struct ifla_vf_guid *node_guid, 2073 struct ifla_vf_guid *port_guid) 2074{ 2075 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2076 2077 return ib_get_vf_guid(priv->ca, vf, priv->port, node_guid, port_guid); 2078} 2079 2080static int ipoib_get_vf_stats(struct net_device *dev, int vf, 2081 struct ifla_vf_stats *vf_stats) 2082{ 2083 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2084 2085 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats); 2086} 2087 2088static const struct header_ops ipoib_header_ops = { 2089 .create = ipoib_hard_header, 2090}; 2091 2092static const struct net_device_ops ipoib_netdev_ops_pf = { 2093 .ndo_init = ipoib_ndo_init, 2094 .ndo_uninit = ipoib_ndo_uninit, 2095 .ndo_open = ipoib_open, 2096 .ndo_stop = ipoib_stop, 2097 .ndo_change_mtu = ipoib_change_mtu, 2098 .ndo_fix_features = ipoib_fix_features, 2099 .ndo_start_xmit = ipoib_start_xmit, 2100 .ndo_tx_timeout = ipoib_timeout, 2101 .ndo_set_rx_mode = ipoib_set_mcast_list, 2102 .ndo_get_iflink = ipoib_get_iflink, 2103 .ndo_set_vf_link_state = ipoib_set_vf_link_state, 2104 .ndo_get_vf_config = ipoib_get_vf_config, 2105 .ndo_get_vf_stats = ipoib_get_vf_stats, 2106 .ndo_get_vf_guid = ipoib_get_vf_guid, 2107 .ndo_set_vf_guid = ipoib_set_vf_guid, 2108 .ndo_set_mac_address = ipoib_set_mac, 2109 .ndo_get_stats64 = ipoib_get_stats, 2110 .ndo_eth_ioctl = ipoib_ioctl, 2111}; 2112 2113static const struct net_device_ops ipoib_netdev_ops_vf = { 2114 .ndo_init = ipoib_ndo_init, 2115 .ndo_uninit = ipoib_ndo_uninit, 2116 .ndo_open = ipoib_open, 2117 .ndo_stop = ipoib_stop, 2118 .ndo_change_mtu = ipoib_change_mtu, 2119 .ndo_fix_features = ipoib_fix_features, 2120 .ndo_start_xmit = ipoib_start_xmit, 2121 .ndo_tx_timeout = ipoib_timeout, 2122 .ndo_set_rx_mode = ipoib_set_mcast_list, 2123 .ndo_get_iflink = ipoib_get_iflink, 2124 .ndo_get_stats64 = ipoib_get_stats, 2125 .ndo_eth_ioctl = ipoib_ioctl, 2126}; 2127 2128static const struct net_device_ops ipoib_netdev_default_pf = { 2129 .ndo_init = ipoib_dev_init_default, 2130 .ndo_uninit = ipoib_dev_uninit_default, 2131 .ndo_open = ipoib_ib_dev_open_default, 2132 .ndo_stop = ipoib_ib_dev_stop_default, 2133}; 2134 2135void ipoib_setup_common(struct net_device *dev) 2136{ 2137 dev->header_ops = &ipoib_header_ops; 2138 dev->netdev_ops = &ipoib_netdev_default_pf; 2139 2140 ipoib_set_ethtool_ops(dev); 2141 2142 dev->watchdog_timeo = 10 * HZ; 2143 2144 dev->flags |= IFF_BROADCAST | IFF_MULTICAST; 2145 2146 dev->hard_header_len = IPOIB_HARD_LEN; 2147 dev->addr_len = INFINIBAND_ALEN; 2148 dev->type = ARPHRD_INFINIBAND; 2149 dev->tx_queue_len = ipoib_sendq_size * 2; 2150 dev->features = (NETIF_F_VLAN_CHALLENGED | 2151 NETIF_F_HIGHDMA); 2152 netif_keep_dst(dev); 2153 2154 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN); 2155 2156 /* 2157 * unregister_netdev always frees the netdev, we use this mode 2158 * consistently to unify all the various unregister paths, including 2159 * those connected to rtnl_link_ops which require it. 2160 */ 2161 dev->needs_free_netdev = true; 2162} 2163 2164static void ipoib_build_priv(struct net_device *dev) 2165{ 2166 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2167 2168 priv->dev = dev; 2169 spin_lock_init(&priv->lock); 2170 init_rwsem(&priv->vlan_rwsem); 2171 mutex_init(&priv->mcast_mutex); 2172 2173 INIT_LIST_HEAD(&priv->path_list); 2174 INIT_LIST_HEAD(&priv->child_intfs); 2175 INIT_LIST_HEAD(&priv->dead_ahs); 2176 INIT_LIST_HEAD(&priv->multicast_list); 2177 2178 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task); 2179 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task); 2180 INIT_WORK(&priv->reschedule_napi_work, ipoib_napi_schedule_work); 2181 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light); 2182 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal); 2183 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy); 2184 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task); 2185 INIT_WORK(&priv->tx_timeout_work, ipoib_ib_tx_timeout_work); 2186 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah); 2187 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh); 2188} 2189 2190static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u32 port, 2191 const char *name) 2192{ 2193 struct net_device *dev; 2194 2195 dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name, 2196 NET_NAME_UNKNOWN, ipoib_setup_common); 2197 if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP) 2198 return dev; 2199 2200 dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN, 2201 ipoib_setup_common); 2202 if (!dev) 2203 return ERR_PTR(-ENOMEM); 2204 return dev; 2205} 2206 2207int ipoib_intf_init(struct ib_device *hca, u32 port, const char *name, 2208 struct net_device *dev) 2209{ 2210 struct rdma_netdev *rn = netdev_priv(dev); 2211 struct ipoib_dev_priv *priv; 2212 int rc; 2213 2214 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 2215 if (!priv) 2216 return -ENOMEM; 2217 2218 priv->ca = hca; 2219 priv->port = port; 2220 2221 rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name, 2222 NET_NAME_UNKNOWN, ipoib_setup_common, dev); 2223 if (rc) { 2224 if (rc != -EOPNOTSUPP) 2225 goto out; 2226 2227 rn->send = ipoib_send; 2228 rn->attach_mcast = ipoib_mcast_attach; 2229 rn->detach_mcast = ipoib_mcast_detach; 2230 rn->hca = hca; 2231 2232 rc = netif_set_real_num_tx_queues(dev, 1); 2233 if (rc) 2234 goto out; 2235 2236 rc = netif_set_real_num_rx_queues(dev, 1); 2237 if (rc) 2238 goto out; 2239 } 2240 2241 priv->rn_ops = dev->netdev_ops; 2242 2243 if (hca->attrs.kernel_cap_flags & IBK_VIRTUAL_FUNCTION) 2244 dev->netdev_ops = &ipoib_netdev_ops_vf; 2245 else 2246 dev->netdev_ops = &ipoib_netdev_ops_pf; 2247 2248 rn->clnt_priv = priv; 2249 /* 2250 * Only the child register_netdev flows can handle priv_destructor 2251 * being set, so we force it to NULL here and handle manually until it 2252 * is safe to turn on. 2253 */ 2254 priv->next_priv_destructor = dev->priv_destructor; 2255 dev->priv_destructor = NULL; 2256 2257 ipoib_build_priv(dev); 2258 2259 return 0; 2260 2261out: 2262 kfree(priv); 2263 return rc; 2264} 2265 2266struct net_device *ipoib_intf_alloc(struct ib_device *hca, u32 port, 2267 const char *name) 2268{ 2269 struct net_device *dev; 2270 int rc; 2271 2272 dev = ipoib_alloc_netdev(hca, port, name); 2273 if (IS_ERR(dev)) 2274 return dev; 2275 2276 rc = ipoib_intf_init(hca, port, name, dev); 2277 if (rc) { 2278 free_netdev(dev); 2279 return ERR_PTR(rc); 2280 } 2281 2282 /* 2283 * Upon success the caller must ensure ipoib_intf_free is called or 2284 * register_netdevice succeed'd and priv_destructor is set to 2285 * ipoib_intf_free. 2286 */ 2287 return dev; 2288} 2289 2290void ipoib_intf_free(struct net_device *dev) 2291{ 2292 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2293 struct rdma_netdev *rn = netdev_priv(dev); 2294 2295 dev->priv_destructor = priv->next_priv_destructor; 2296 if (dev->priv_destructor) 2297 dev->priv_destructor(dev); 2298 2299 /* 2300 * There are some error flows around register_netdev failing that may 2301 * attempt to call priv_destructor twice, prevent that from happening. 2302 */ 2303 dev->priv_destructor = NULL; 2304 2305 /* unregister/destroy is very complicated. Make bugs more obvious. */ 2306 rn->clnt_priv = NULL; 2307 2308 kfree(priv); 2309} 2310 2311static ssize_t pkey_show(struct device *dev, struct device_attribute *attr, 2312 char *buf) 2313{ 2314 struct net_device *ndev = to_net_dev(dev); 2315 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2316 2317 return sysfs_emit(buf, "0x%04x\n", priv->pkey); 2318} 2319static DEVICE_ATTR_RO(pkey); 2320 2321static ssize_t umcast_show(struct device *dev, struct device_attribute *attr, 2322 char *buf) 2323{ 2324 struct net_device *ndev = to_net_dev(dev); 2325 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2326 2327 return sysfs_emit(buf, "%d\n", 2328 test_bit(IPOIB_FLAG_UMCAST, &priv->flags)); 2329} 2330 2331void ipoib_set_umcast(struct net_device *ndev, int umcast_val) 2332{ 2333 struct ipoib_dev_priv *priv = ipoib_priv(ndev); 2334 2335 if (umcast_val > 0) { 2336 set_bit(IPOIB_FLAG_UMCAST, &priv->flags); 2337 ipoib_warn(priv, "ignoring multicast groups joined directly " 2338 "by userspace\n"); 2339 } else 2340 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags); 2341} 2342 2343static ssize_t umcast_store(struct device *dev, struct device_attribute *attr, 2344 const char *buf, size_t count) 2345{ 2346 unsigned long umcast_val = simple_strtoul(buf, NULL, 0); 2347 2348 ipoib_set_umcast(to_net_dev(dev), umcast_val); 2349 2350 return count; 2351} 2352static DEVICE_ATTR_RW(umcast); 2353 2354int ipoib_add_umcast_attr(struct net_device *dev) 2355{ 2356 return device_create_file(&dev->dev, &dev_attr_umcast); 2357} 2358 2359static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid) 2360{ 2361 struct ipoib_dev_priv *child_priv; 2362 struct net_device *netdev = priv->dev; 2363 2364 netif_addr_lock_bh(netdev); 2365 2366 memcpy(&priv->local_gid.global.interface_id, 2367 &gid->global.interface_id, 2368 sizeof(gid->global.interface_id)); 2369 dev_addr_mod(netdev, 4, (u8 *)&priv->local_gid, sizeof(priv->local_gid)); 2370 clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags); 2371 2372 netif_addr_unlock_bh(netdev); 2373 2374 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { 2375 down_read(&priv->vlan_rwsem); 2376 list_for_each_entry(child_priv, &priv->child_intfs, list) 2377 set_base_guid(child_priv, gid); 2378 up_read(&priv->vlan_rwsem); 2379 } 2380} 2381 2382static int ipoib_check_lladdr(struct net_device *dev, 2383 struct sockaddr_storage *ss) 2384{ 2385 union ib_gid *gid = (union ib_gid *)(ss->__data + 4); 2386 int ret = 0; 2387 2388 netif_addr_lock_bh(dev); 2389 2390 /* Make sure the QPN, reserved and subnet prefix match the current 2391 * lladdr, it also makes sure the lladdr is unicast. 2392 */ 2393 if (memcmp(dev->dev_addr, ss->__data, 2394 4 + sizeof(gid->global.subnet_prefix)) || 2395 gid->global.interface_id == 0) 2396 ret = -EINVAL; 2397 2398 netif_addr_unlock_bh(dev); 2399 2400 return ret; 2401} 2402 2403static int ipoib_set_mac(struct net_device *dev, void *addr) 2404{ 2405 struct ipoib_dev_priv *priv = ipoib_priv(dev); 2406 struct sockaddr_storage *ss = addr; 2407 int ret; 2408 2409 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) 2410 return -EBUSY; 2411 2412 ret = ipoib_check_lladdr(dev, ss); 2413 if (ret) 2414 return ret; 2415 2416 set_base_guid(priv, (union ib_gid *)(ss->__data + 4)); 2417 2418 queue_work(ipoib_workqueue, &priv->flush_light); 2419 2420 return 0; 2421} 2422 2423static ssize_t create_child_store(struct device *dev, 2424 struct device_attribute *attr, 2425 const char *buf, size_t count) 2426{ 2427 int pkey; 2428 int ret; 2429 2430 if (sscanf(buf, "%i", &pkey) != 1) 2431 return -EINVAL; 2432 2433 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000) 2434 return -EINVAL; 2435 2436 ret = ipoib_vlan_add(to_net_dev(dev), pkey); 2437 2438 return ret ? ret : count; 2439} 2440static DEVICE_ATTR_WO(create_child); 2441 2442static ssize_t delete_child_store(struct device *dev, 2443 struct device_attribute *attr, 2444 const char *buf, size_t count) 2445{ 2446 int pkey; 2447 int ret; 2448 2449 if (sscanf(buf, "%i", &pkey) != 1) 2450 return -EINVAL; 2451 2452 if (pkey < 0 || pkey > 0xffff) 2453 return -EINVAL; 2454 2455 ret = ipoib_vlan_delete(to_net_dev(dev), pkey); 2456 2457 return ret ? ret : count; 2458 2459} 2460static DEVICE_ATTR_WO(delete_child); 2461 2462int ipoib_add_pkey_attr(struct net_device *dev) 2463{ 2464 return device_create_file(&dev->dev, &dev_attr_pkey); 2465} 2466 2467/* 2468 * We erroneously exposed the iface's port number in the dev_id 2469 * sysfs field long after dev_port was introduced for that purpose[1], 2470 * and we need to stop everyone from relying on that. 2471 * Let's overload the shower routine for the dev_id file here 2472 * to gently bring the issue up. 2473 * 2474 * [1] https://www.spinics.net/lists/netdev/msg272123.html 2475 */ 2476static ssize_t dev_id_show(struct device *dev, 2477 struct device_attribute *attr, char *buf) 2478{ 2479 struct net_device *ndev = to_net_dev(dev); 2480 2481 /* 2482 * ndev->dev_port will be equal to 0 in old kernel prior to commit 2483 * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface 2484 * port numbers") Zero was chosen as special case for user space 2485 * applications to fallback and query dev_id to check if it has 2486 * different value or not. 2487 * 2488 * Don't print warning in such scenario. 2489 * 2490 * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358 2491 */ 2492 if (ndev->dev_port && ndev->dev_id == ndev->dev_port) 2493 netdev_info_once(ndev, 2494 "\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n", 2495 current->comm); 2496 2497 return sysfs_emit(buf, "%#x\n", ndev->dev_id); 2498} 2499static DEVICE_ATTR_RO(dev_id); 2500 2501static int ipoib_intercept_dev_id_attr(struct net_device *dev) 2502{ 2503 device_remove_file(&dev->dev, &dev_attr_dev_id); 2504 return device_create_file(&dev->dev, &dev_attr_dev_id); 2505} 2506 2507static struct net_device *ipoib_add_port(const char *format, 2508 struct ib_device *hca, u32 port) 2509{ 2510 struct rtnl_link_ops *ops = ipoib_get_link_ops(); 2511 struct rdma_netdev_alloc_params params; 2512 struct ipoib_dev_priv *priv; 2513 struct net_device *ndev; 2514 int result; 2515 2516 ndev = ipoib_intf_alloc(hca, port, format); 2517 if (IS_ERR(ndev)) { 2518 pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port, 2519 PTR_ERR(ndev)); 2520 return ndev; 2521 } 2522 priv = ipoib_priv(ndev); 2523 2524 INIT_IB_EVENT_HANDLER(&priv->event_handler, 2525 priv->ca, ipoib_event); 2526 ib_register_event_handler(&priv->event_handler); 2527 2528 /* call event handler to ensure pkey in sync */ 2529 queue_work(ipoib_workqueue, &priv->flush_heavy); 2530 2531 ndev->rtnl_link_ops = ipoib_get_link_ops(); 2532 2533 result = register_netdev(ndev); 2534 if (result) { 2535 pr_warn("%s: couldn't register ipoib port %d; error %d\n", 2536 hca->name, port, result); 2537 2538 ipoib_parent_unregister_pre(ndev); 2539 ipoib_intf_free(ndev); 2540 free_netdev(ndev); 2541 2542 return ERR_PTR(result); 2543 } 2544 2545 if (hca->ops.rdma_netdev_get_params) { 2546 int rc = hca->ops.rdma_netdev_get_params(hca, port, 2547 RDMA_NETDEV_IPOIB, 2548 ¶ms); 2549 2550 if (!rc && ops->priv_size < params.sizeof_priv) 2551 ops->priv_size = params.sizeof_priv; 2552 } 2553 /* 2554 * We cannot set priv_destructor before register_netdev because we 2555 * need priv to be always valid during the error flow to execute 2556 * ipoib_parent_unregister_pre(). Instead handle it manually and only 2557 * enter priv_destructor mode once we are completely registered. 2558 */ 2559 ndev->priv_destructor = ipoib_intf_free; 2560 2561 if (ipoib_intercept_dev_id_attr(ndev)) 2562 goto sysfs_failed; 2563 if (ipoib_cm_add_mode_attr(ndev)) 2564 goto sysfs_failed; 2565 if (ipoib_add_pkey_attr(ndev)) 2566 goto sysfs_failed; 2567 if (ipoib_add_umcast_attr(ndev)) 2568 goto sysfs_failed; 2569 if (device_create_file(&ndev->dev, &dev_attr_create_child)) 2570 goto sysfs_failed; 2571 if (device_create_file(&ndev->dev, &dev_attr_delete_child)) 2572 goto sysfs_failed; 2573 2574 return ndev; 2575 2576sysfs_failed: 2577 ipoib_parent_unregister_pre(ndev); 2578 unregister_netdev(ndev); 2579 return ERR_PTR(-ENOMEM); 2580} 2581 2582static int ipoib_add_one(struct ib_device *device) 2583{ 2584 struct list_head *dev_list; 2585 struct net_device *dev; 2586 struct ipoib_dev_priv *priv; 2587 unsigned int p; 2588 int count = 0; 2589 2590 dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL); 2591 if (!dev_list) 2592 return -ENOMEM; 2593 2594 INIT_LIST_HEAD(dev_list); 2595 2596 rdma_for_each_port (device, p) { 2597 if (!rdma_protocol_ib(device, p)) 2598 continue; 2599 dev = ipoib_add_port("ib%d", device, p); 2600 if (!IS_ERR(dev)) { 2601 priv = ipoib_priv(dev); 2602 list_add_tail(&priv->list, dev_list); 2603 count++; 2604 } 2605 } 2606 2607 if (!count) { 2608 kfree(dev_list); 2609 return -EOPNOTSUPP; 2610 } 2611 2612 ib_set_client_data(device, &ipoib_client, dev_list); 2613 return 0; 2614} 2615 2616static void ipoib_remove_one(struct ib_device *device, void *client_data) 2617{ 2618 struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv; 2619 struct list_head *dev_list = client_data; 2620 2621 list_for_each_entry_safe(priv, tmp, dev_list, list) { 2622 LIST_HEAD(head); 2623 ipoib_parent_unregister_pre(priv->dev); 2624 2625 rtnl_lock(); 2626 2627 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, 2628 list) 2629 unregister_netdevice_queue(cpriv->dev, &head); 2630 unregister_netdevice_queue(priv->dev, &head); 2631 unregister_netdevice_many(&head); 2632 2633 rtnl_unlock(); 2634 } 2635 2636 kfree(dev_list); 2637} 2638 2639#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2640static struct notifier_block ipoib_netdev_notifier = { 2641 .notifier_call = ipoib_netdev_event, 2642}; 2643#endif 2644 2645static int __init ipoib_init_module(void) 2646{ 2647 int ret; 2648 2649 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size); 2650 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE); 2651 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE); 2652 2653 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size); 2654 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE); 2655 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE); 2656#ifdef CONFIG_INFINIBAND_IPOIB_CM 2657 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP); 2658 ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0); 2659#endif 2660 2661 /* 2662 * When copying small received packets, we only copy from the 2663 * linear data part of the SKB, so we rely on this condition. 2664 */ 2665 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE); 2666 2667 ipoib_register_debugfs(); 2668 2669 /* 2670 * We create a global workqueue here that is used for all flush 2671 * operations. However, if you attempt to flush a workqueue 2672 * from a task on that same workqueue, it deadlocks the system. 2673 * We want to be able to flush the tasks associated with a 2674 * specific net device, so we also create a workqueue for each 2675 * netdevice. We queue up the tasks for that device only on 2676 * its private workqueue, and we only queue up flush events 2677 * on our global flush workqueue. This avoids the deadlocks. 2678 */ 2679 ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0); 2680 if (!ipoib_workqueue) { 2681 ret = -ENOMEM; 2682 goto err_fs; 2683 } 2684 2685 ib_sa_register_client(&ipoib_sa_client); 2686 2687 ret = ib_register_client(&ipoib_client); 2688 if (ret) 2689 goto err_sa; 2690 2691 ret = ipoib_netlink_init(); 2692 if (ret) 2693 goto err_client; 2694 2695#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2696 register_netdevice_notifier(&ipoib_netdev_notifier); 2697#endif 2698 return 0; 2699 2700err_client: 2701 ib_unregister_client(&ipoib_client); 2702 2703err_sa: 2704 ib_sa_unregister_client(&ipoib_sa_client); 2705 destroy_workqueue(ipoib_workqueue); 2706 2707err_fs: 2708 ipoib_unregister_debugfs(); 2709 2710 return ret; 2711} 2712 2713static void __exit ipoib_cleanup_module(void) 2714{ 2715#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG 2716 unregister_netdevice_notifier(&ipoib_netdev_notifier); 2717#endif 2718 ipoib_netlink_fini(); 2719 ib_unregister_client(&ipoib_client); 2720 ib_sa_unregister_client(&ipoib_sa_client); 2721 ipoib_unregister_debugfs(); 2722 destroy_workqueue(ipoib_workqueue); 2723} 2724 2725module_init(ipoib_init_module); 2726module_exit(ipoib_cleanup_module); 2727