1 /* 2 * Copyright (c) 2005 Voltaire Inc. All rights reserved. 3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved. 4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved. 5 * Copyright (c) 2005 Intel Corporation. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36 #include <linux/mutex.h> 37 #include <linux/inetdevice.h> 38 #include <linux/slab.h> 39 #include <linux/workqueue.h> 40 #include <linux/module.h> 41 #include <net/route.h> 42 #include <net/netevent.h> 43 #include <rdma/ib_addr.h> 44 #include <rdma/ib.h> 45 46 #include <netinet/if_ether.h> 47 #include <netinet/ip_var.h> 48 #include <netinet6/scope6_var.h> 49 #include <netinet6/in6_pcb.h> 50 51 #include "core_priv.h" 52 53 struct addr_req { 54 struct list_head list; 55 struct sockaddr_storage src_addr; 56 struct sockaddr_storage dst_addr; 57 struct rdma_dev_addr *addr; 58 struct rdma_addr_client *client; 59 void *context; 60 void (*callback)(int status, struct sockaddr *src_addr, 61 struct rdma_dev_addr *addr, void *context); 62 unsigned long timeout; 63 int status; 64 }; 65 66 static void process_req(struct work_struct *work); 67 68 static DEFINE_MUTEX(lock); 69 static LIST_HEAD(req_list); 70 static DECLARE_DELAYED_WORK(work, process_req); 71 static struct workqueue_struct *addr_wq; 72 73 int rdma_addr_size(struct sockaddr *addr) 74 { 75 switch (addr->sa_family) { 76 case AF_INET: 77 return sizeof(struct sockaddr_in); 78 case AF_INET6: 79 return sizeof(struct sockaddr_in6); 80 case AF_IB: 81 return sizeof(struct sockaddr_ib); 82 default: 83 return 0; 84 } 85 } 86 EXPORT_SYMBOL(rdma_addr_size); 87 88 static struct rdma_addr_client self; 89 90 void rdma_addr_register_client(struct rdma_addr_client *client) 91 { 92 atomic_set(&client->refcount, 1); 93 init_completion(&client->comp); 94 } 95 EXPORT_SYMBOL(rdma_addr_register_client); 96 97 static inline void put_client(struct rdma_addr_client *client) 98 { 99 if (atomic_dec_and_test(&client->refcount)) 100 complete(&client->comp); 101 } 102 103 void rdma_addr_unregister_client(struct rdma_addr_client *client) 104 { 105 put_client(client); 106 wait_for_completion(&client->comp); 107 } 108 EXPORT_SYMBOL(rdma_addr_unregister_client); 109 110 static inline void 111 rdma_copy_addr_sub(u8 *dst, const u8 *src, unsigned min, unsigned max) 112 { 113 if (min > max) 114 min = max; 115 memcpy(dst, src, min); 116 memset(dst + min, 0, max - min); 117 } 118 119 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct net_device *dev, 120 const unsigned char *dst_dev_addr) 121 { 122 if (dev->if_type == IFT_INFINIBAND) 123 dev_addr->dev_type = ARPHRD_INFINIBAND; 124 else if (dev->if_type == IFT_ETHER) 125 dev_addr->dev_type = ARPHRD_ETHER; 126 else 127 dev_addr->dev_type = 0; 128 rdma_copy_addr_sub(dev_addr->src_dev_addr, IF_LLADDR(dev), 129 dev->if_addrlen, MAX_ADDR_LEN); 130 rdma_copy_addr_sub(dev_addr->broadcast, dev->if_broadcastaddr, 131 dev->if_addrlen, MAX_ADDR_LEN); 132 if (dst_dev_addr != NULL) { 133 rdma_copy_addr_sub(dev_addr->dst_dev_addr, dst_dev_addr, 134 dev->if_addrlen, MAX_ADDR_LEN); 135 } 136 dev_addr->bound_dev_if = dev->if_index; 137 return 0; 138 } 139 EXPORT_SYMBOL(rdma_copy_addr); 140 141 int rdma_translate_ip(const struct sockaddr *addr, 142 struct rdma_dev_addr *dev_addr, 143 u16 *vlan_id) 144 { 145 struct net_device *dev = NULL; 146 int ret = -EADDRNOTAVAIL; 147 148 if (dev_addr->bound_dev_if) { 149 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if); 150 if (!dev) 151 return -ENODEV; 152 ret = rdma_copy_addr(dev_addr, dev, NULL); 153 dev_put(dev); 154 return ret; 155 } 156 157 switch (addr->sa_family) { 158 #ifdef INET 159 case AF_INET: 160 dev = ip_dev_find(dev_addr->net, 161 ((const struct sockaddr_in *)addr)->sin_addr.s_addr); 162 break; 163 #endif 164 #ifdef INET6 165 case AF_INET6: 166 dev = ip6_dev_find(dev_addr->net, 167 ((const struct sockaddr_in6 *)addr)->sin6_addr); 168 break; 169 #endif 170 default: 171 break; 172 } 173 174 if (dev != NULL) { 175 ret = rdma_copy_addr(dev_addr, dev, NULL); 176 if (vlan_id) 177 *vlan_id = rdma_vlan_dev_vlan_id(dev); 178 dev_put(dev); 179 } 180 return ret; 181 } 182 EXPORT_SYMBOL(rdma_translate_ip); 183 184 static void set_timeout(unsigned long time) 185 { 186 int delay; /* under FreeBSD ticks are 32-bit */ 187 188 delay = time - jiffies; 189 if (delay <= 0) 190 delay = 1; 191 192 mod_delayed_work(addr_wq, &work, delay); 193 } 194 195 static void queue_req(struct addr_req *req) 196 { 197 struct addr_req *temp_req; 198 199 mutex_lock(&lock); 200 list_for_each_entry_reverse(temp_req, &req_list, list) { 201 if (time_after_eq(req->timeout, temp_req->timeout)) 202 break; 203 } 204 205 list_add(&req->list, &temp_req->list); 206 207 if (req_list.next == &req->list) 208 set_timeout(req->timeout); 209 mutex_unlock(&lock); 210 } 211 212 #if defined(INET) || defined(INET6) 213 static int addr_resolve_multi(u8 *edst, struct ifnet *ifp, struct sockaddr *dst_in) 214 { 215 struct sockaddr *llsa; 216 struct sockaddr_dl sdl; 217 int error; 218 219 sdl.sdl_len = sizeof(sdl); 220 llsa = (struct sockaddr *)&sdl; 221 222 if (ifp->if_resolvemulti == NULL) { 223 error = EOPNOTSUPP; 224 } else { 225 error = ifp->if_resolvemulti(ifp, &llsa, dst_in); 226 if (error == 0) { 227 rdma_copy_addr_sub(edst, LLADDR((struct sockaddr_dl *)llsa), 228 ifp->if_addrlen, MAX_ADDR_LEN); 229 } 230 } 231 return (error); 232 } 233 #endif 234 235 #ifdef INET 236 static int addr4_resolve(struct sockaddr_in *src_in, 237 const struct sockaddr_in *dst_in, 238 struct rdma_dev_addr *addr, 239 struct ifnet **ifpp) 240 { 241 struct sockaddr_in dst_tmp = *dst_in; 242 u8 edst[MAX_ADDR_LEN]; 243 in_port_t src_port; 244 struct sockaddr *saddr; 245 struct rtentry *rte; 246 struct ifnet *ifp; 247 int error; 248 int type; 249 250 /* set VNET, if any */ 251 CURVNET_SET(addr->net); 252 253 /* set default TTL limit */ 254 addr->hoplimit = V_ip_defttl; 255 256 type = 0; 257 if (src_in->sin_addr.s_addr == INADDR_ANY) 258 type |= 1; 259 if (dst_tmp.sin_addr.s_addr == INADDR_ANY) 260 type |= 2; 261 262 /* 263 * Make sure the socket address length field 264 * is set, else rtalloc1() will fail. 265 */ 266 dst_tmp.sin_len = sizeof(dst_tmp); 267 268 /* Step 1 - lookup destination route if any */ 269 switch (type) { 270 case 0: 271 case 1: 272 /* regular destination route lookup */ 273 rte = rtalloc1((struct sockaddr *)&dst_tmp, 1, 0); 274 if (rte == NULL) { 275 error = EHOSTUNREACH; 276 goto done; 277 } else if (rte->rt_ifp == NULL || rte->rt_ifp == V_loif || 278 RT_LINK_IS_UP(rte->rt_ifp) == 0) { 279 RTFREE_LOCKED(rte); 280 error = EHOSTUNREACH; 281 goto done; 282 } 283 RT_UNLOCK(rte); 284 break; 285 default: 286 error = ENETUNREACH; 287 goto done; 288 } 289 290 /* Step 2 - find outgoing network interface */ 291 switch (type) { 292 case 0: 293 /* source check */ 294 ifp = ip_dev_find(addr->net, src_in->sin_addr.s_addr); 295 if (ifp == NULL) { 296 error = ENETUNREACH; 297 goto error_rt_free; 298 } else if (ifp != rte->rt_ifp) { 299 error = ENETUNREACH; 300 goto error_put_ifp; 301 } 302 break; 303 case 1: 304 /* get destination network interface from route */ 305 ifp = rte->rt_ifp; 306 dev_hold(ifp); 307 saddr = rte->rt_ifa->ifa_addr; 308 309 src_port = src_in->sin_port; 310 memcpy(src_in, saddr, rdma_addr_size(saddr)); 311 src_in->sin_port = src_port; /* preserve port number */ 312 break; 313 default: 314 break; 315 } 316 317 /* 318 * Step 3 - resolve destination MAC address 319 */ 320 if (dst_tmp.sin_addr.s_addr == INADDR_BROADCAST) { 321 rdma_copy_addr_sub(edst, ifp->if_broadcastaddr, 322 ifp->if_addrlen, MAX_ADDR_LEN); 323 } else if (IN_MULTICAST(ntohl(dst_tmp.sin_addr.s_addr))) { 324 error = addr_resolve_multi(edst, ifp, (struct sockaddr *)&dst_tmp); 325 if (error != 0) 326 goto error_put_ifp; 327 } else { 328 bool is_gw = (rte->rt_flags & RTF_GATEWAY) != 0; 329 memset(edst, 0, sizeof(edst)); 330 error = arpresolve(ifp, is_gw, NULL, is_gw ? 331 rte->rt_gateway : (const struct sockaddr *)&dst_tmp, 332 edst, NULL, NULL); 333 if (error != 0) 334 goto error_put_ifp; 335 else if (is_gw != 0) 336 addr->network = RDMA_NETWORK_IPV4; 337 } 338 339 /* 340 * Step 4 - copy destination and source MAC addresses 341 */ 342 error = -rdma_copy_addr(addr, ifp, edst); 343 if (error != 0) 344 goto error_put_ifp; 345 346 if (rte != NULL) 347 RTFREE(rte); 348 349 *ifpp = ifp; 350 351 goto done; 352 353 error_put_ifp: 354 dev_put(ifp); 355 error_rt_free: 356 RTFREE(rte); 357 done: 358 CURVNET_RESTORE(); 359 360 if (error == EWOULDBLOCK || error == EAGAIN) 361 error = ENODATA; 362 return (-error); 363 } 364 #else 365 static int addr4_resolve(struct sockaddr_in *src_in, 366 const struct sockaddr_in *dst_in, 367 struct rdma_dev_addr *addr, 368 struct ifnet **ifpp) 369 { 370 return -EADDRNOTAVAIL; 371 } 372 #endif 373 374 #ifdef INET6 375 static int addr6_resolve(struct sockaddr_in6 *src_in, 376 const struct sockaddr_in6 *dst_in, 377 struct rdma_dev_addr *addr, 378 struct ifnet **ifpp) 379 { 380 struct sockaddr_in6 dst_tmp = *dst_in; 381 u8 edst[MAX_ADDR_LEN]; 382 in_port_t src_port; 383 struct sockaddr *saddr; 384 struct rtentry *rte; 385 struct ifnet *ifp; 386 int error; 387 int type; 388 389 /* set VNET, if any */ 390 CURVNET_SET(addr->net); 391 392 /* set default TTL limit */ 393 addr->hoplimit = V_ip_defttl; 394 395 type = 0; 396 if (ipv6_addr_any(&src_in->sin6_addr)) 397 type |= 1; 398 if (ipv6_addr_any(&dst_tmp.sin6_addr)) 399 type |= 2; 400 401 /* 402 * Make sure the socket address length field 403 * is set, else rtalloc1() will fail. 404 */ 405 dst_tmp.sin6_len = sizeof(dst_tmp); 406 407 /* Step 1 - lookup destination route if any */ 408 switch (type) { 409 case 0: 410 /* sanity check for IPv4 addresses */ 411 if (ipv6_addr_v4mapped(&src_in->sin6_addr) != 412 ipv6_addr_v4mapped(&dst_tmp.sin6_addr)) { 413 error = EAFNOSUPPORT; 414 goto done; 415 } 416 /* FALLTHROUGH */ 417 case 1: 418 /* regular destination route lookup */ 419 rte = rtalloc1((struct sockaddr *)&dst_tmp, 1, 0); 420 if (rte == NULL) { 421 error = EHOSTUNREACH; 422 goto done; 423 } else if (rte->rt_ifp == NULL || rte->rt_ifp == V_loif || 424 RT_LINK_IS_UP(rte->rt_ifp) == 0) { 425 RTFREE_LOCKED(rte); 426 error = EHOSTUNREACH; 427 goto done; 428 } 429 RT_UNLOCK(rte); 430 break; 431 default: 432 error = ENETUNREACH; 433 goto done; 434 } 435 436 /* Step 2 - find outgoing network interface */ 437 switch (type) { 438 case 0: 439 /* source check */ 440 ifp = ip6_dev_find(addr->net, src_in->sin6_addr); 441 if (ifp == NULL) { 442 error = ENETUNREACH; 443 goto error_rt_free; 444 } else if (ifp != rte->rt_ifp) { 445 error = ENETUNREACH; 446 goto error_put_ifp; 447 } 448 break; 449 case 1: 450 /* get destination network interface from route */ 451 ifp = rte->rt_ifp; 452 dev_hold(ifp); 453 saddr = rte->rt_ifa->ifa_addr; 454 455 src_port = src_in->sin6_port; 456 memcpy(src_in, saddr, rdma_addr_size(saddr)); 457 src_in->sin6_port = src_port; /* preserve port number */ 458 break; 459 default: 460 break; 461 } 462 463 /* 464 * Step 3 - resolve destination MAC address 465 */ 466 if (IN6_IS_ADDR_MULTICAST(&dst_tmp.sin6_addr)) { 467 error = addr_resolve_multi(edst, ifp, 468 (struct sockaddr *)&dst_tmp); 469 if (error != 0) 470 goto error_put_ifp; 471 } else { 472 bool is_gw = (rte->rt_flags & RTF_GATEWAY) != 0; 473 memset(edst, 0, sizeof(edst)); 474 error = nd6_resolve(ifp, is_gw, NULL, is_gw ? 475 rte->rt_gateway : (const struct sockaddr *)&dst_tmp, 476 edst, NULL, NULL); 477 if (error != 0) 478 goto error_put_ifp; 479 else if (is_gw != 0) 480 addr->network = RDMA_NETWORK_IPV6; 481 } 482 483 /* 484 * Step 4 - copy destination and source MAC addresses 485 */ 486 error = -rdma_copy_addr(addr, ifp, edst); 487 if (error != 0) 488 goto error_put_ifp; 489 490 if (rte != NULL) 491 RTFREE(rte); 492 493 *ifpp = ifp; 494 495 goto done; 496 497 error_put_ifp: 498 dev_put(ifp); 499 error_rt_free: 500 RTFREE(rte); 501 done: 502 CURVNET_RESTORE(); 503 504 if (error == EWOULDBLOCK || error == EAGAIN) 505 error = ENODATA; 506 return (-error); 507 } 508 #else 509 static int addr6_resolve(struct sockaddr_in6 *src_in, 510 const struct sockaddr_in6 *dst_in, 511 struct rdma_dev_addr *addr, 512 struct ifnet **ifpp) 513 { 514 return -EADDRNOTAVAIL; 515 } 516 #endif 517 518 static int addr_resolve_neigh(struct ifnet *dev, 519 const struct sockaddr *dst_in, 520 struct rdma_dev_addr *addr) 521 { 522 if (dev->if_flags & IFF_LOOPBACK) { 523 int ret; 524 525 ret = rdma_translate_ip(dst_in, addr, NULL); 526 if (!ret) 527 memcpy(addr->dst_dev_addr, addr->src_dev_addr, 528 MAX_ADDR_LEN); 529 530 return ret; 531 } 532 533 /* If the device doesn't do ARP internally */ 534 if (!(dev->if_flags & IFF_NOARP)) 535 return 0; 536 537 return rdma_copy_addr(addr, dev, NULL); 538 } 539 540 static int addr_resolve(struct sockaddr *src_in, 541 const struct sockaddr *dst_in, 542 struct rdma_dev_addr *addr, 543 bool resolve_neigh) 544 { 545 struct net_device *ndev = NULL; 546 int ret; 547 548 if (dst_in->sa_family != src_in->sa_family) 549 return -EINVAL; 550 551 if (src_in->sa_family == AF_INET) { 552 ret = addr4_resolve((struct sockaddr_in *)src_in, 553 (const struct sockaddr_in *)dst_in, 554 addr, &ndev); 555 if (ret) 556 return ret; 557 558 if (resolve_neigh) 559 ret = addr_resolve_neigh(ndev, dst_in, addr); 560 } else { 561 ret = addr6_resolve((struct sockaddr_in6 *)src_in, 562 (const struct sockaddr_in6 *)dst_in, addr, 563 &ndev); 564 if (ret) 565 return ret; 566 567 if (resolve_neigh) 568 ret = addr_resolve_neigh(ndev, dst_in, addr); 569 } 570 571 addr->bound_dev_if = ndev->if_index; 572 addr->net = dev_net(ndev); 573 dev_put(ndev); 574 575 return ret; 576 } 577 578 static void process_req(struct work_struct *work) 579 { 580 struct addr_req *req, *temp_req; 581 struct sockaddr *src_in, *dst_in; 582 struct list_head done_list; 583 584 INIT_LIST_HEAD(&done_list); 585 586 mutex_lock(&lock); 587 list_for_each_entry_safe(req, temp_req, &req_list, list) { 588 if (req->status == -ENODATA) { 589 src_in = (struct sockaddr *) &req->src_addr; 590 dst_in = (struct sockaddr *) &req->dst_addr; 591 req->status = addr_resolve(src_in, dst_in, req->addr, 592 true); 593 if (req->status && time_after_eq(jiffies, req->timeout)) 594 req->status = -ETIMEDOUT; 595 else if (req->status == -ENODATA) 596 continue; 597 } 598 list_move_tail(&req->list, &done_list); 599 } 600 601 if (!list_empty(&req_list)) { 602 req = list_entry(req_list.next, struct addr_req, list); 603 set_timeout(req->timeout); 604 } 605 mutex_unlock(&lock); 606 607 list_for_each_entry_safe(req, temp_req, &done_list, list) { 608 list_del(&req->list); 609 req->callback(req->status, (struct sockaddr *) &req->src_addr, 610 req->addr, req->context); 611 put_client(req->client); 612 kfree(req); 613 } 614 } 615 616 int rdma_resolve_ip(struct rdma_addr_client *client, 617 struct sockaddr *src_addr, struct sockaddr *dst_addr, 618 struct rdma_dev_addr *addr, int timeout_ms, 619 void (*callback)(int status, struct sockaddr *src_addr, 620 struct rdma_dev_addr *addr, void *context), 621 void *context) 622 { 623 struct sockaddr *src_in, *dst_in; 624 struct addr_req *req; 625 int ret = 0; 626 627 req = kzalloc(sizeof *req, GFP_KERNEL); 628 if (!req) 629 return -ENOMEM; 630 631 src_in = (struct sockaddr *) &req->src_addr; 632 dst_in = (struct sockaddr *) &req->dst_addr; 633 634 if (src_addr) { 635 if (src_addr->sa_family != dst_addr->sa_family) { 636 ret = -EINVAL; 637 goto err; 638 } 639 640 memcpy(src_in, src_addr, rdma_addr_size(src_addr)); 641 } else { 642 src_in->sa_family = dst_addr->sa_family; 643 } 644 645 memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr)); 646 req->addr = addr; 647 req->callback = callback; 648 req->context = context; 649 req->client = client; 650 atomic_inc(&client->refcount); 651 652 req->status = addr_resolve(src_in, dst_in, addr, true); 653 switch (req->status) { 654 case 0: 655 req->timeout = jiffies; 656 queue_req(req); 657 break; 658 case -ENODATA: 659 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies; 660 queue_req(req); 661 break; 662 default: 663 ret = req->status; 664 atomic_dec(&client->refcount); 665 goto err; 666 } 667 return ret; 668 err: 669 kfree(req); 670 return ret; 671 } 672 EXPORT_SYMBOL(rdma_resolve_ip); 673 674 int rdma_resolve_ip_route(struct sockaddr *src_addr, 675 const struct sockaddr *dst_addr, 676 struct rdma_dev_addr *addr) 677 { 678 struct sockaddr_storage ssrc_addr = {}; 679 struct sockaddr *src_in = (struct sockaddr *)&ssrc_addr; 680 681 if (src_addr) { 682 if (src_addr->sa_family != dst_addr->sa_family) 683 return -EINVAL; 684 685 memcpy(src_in, src_addr, rdma_addr_size(src_addr)); 686 } else { 687 src_in->sa_family = dst_addr->sa_family; 688 } 689 690 return addr_resolve(src_in, dst_addr, addr, false); 691 } 692 EXPORT_SYMBOL(rdma_resolve_ip_route); 693 694 void rdma_addr_cancel(struct rdma_dev_addr *addr) 695 { 696 struct addr_req *req, *temp_req; 697 698 mutex_lock(&lock); 699 list_for_each_entry_safe(req, temp_req, &req_list, list) { 700 if (req->addr == addr) { 701 req->status = -ECANCELED; 702 req->timeout = jiffies; 703 list_move(&req->list, &req_list); 704 set_timeout(req->timeout); 705 break; 706 } 707 } 708 mutex_unlock(&lock); 709 } 710 EXPORT_SYMBOL(rdma_addr_cancel); 711 712 struct resolve_cb_context { 713 struct rdma_dev_addr *addr; 714 struct completion comp; 715 int status; 716 }; 717 718 static void resolve_cb(int status, struct sockaddr *src_addr, 719 struct rdma_dev_addr *addr, void *context) 720 { 721 if (!status) 722 memcpy(((struct resolve_cb_context *)context)->addr, 723 addr, sizeof(struct rdma_dev_addr)); 724 ((struct resolve_cb_context *)context)->status = status; 725 complete(&((struct resolve_cb_context *)context)->comp); 726 } 727 728 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid, 729 const union ib_gid *dgid, 730 u8 *dmac, u16 *vlan_id, int *if_index, 731 int *hoplimit) 732 { 733 int ret = 0; 734 struct rdma_dev_addr dev_addr; 735 struct resolve_cb_context ctx; 736 struct net_device *dev; 737 738 union { 739 struct sockaddr _sockaddr; 740 struct sockaddr_in _sockaddr_in; 741 struct sockaddr_in6 _sockaddr_in6; 742 } sgid_addr, dgid_addr; 743 744 745 rdma_gid2ip(&sgid_addr._sockaddr, sgid); 746 rdma_gid2ip(&dgid_addr._sockaddr, dgid); 747 748 memset(&dev_addr, 0, sizeof(dev_addr)); 749 if (if_index) 750 dev_addr.bound_dev_if = *if_index; 751 dev_addr.net = TD_TO_VNET(curthread); 752 753 ctx.addr = &dev_addr; 754 init_completion(&ctx.comp); 755 ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr, 756 &dev_addr, 1000, resolve_cb, &ctx); 757 if (ret) 758 return ret; 759 760 wait_for_completion(&ctx.comp); 761 762 ret = ctx.status; 763 if (ret) 764 return ret; 765 766 memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN); 767 dev = dev_get_by_index(dev_addr.net, dev_addr.bound_dev_if); 768 if (!dev) 769 return -ENODEV; 770 if (if_index) 771 *if_index = dev_addr.bound_dev_if; 772 if (vlan_id) 773 *vlan_id = rdma_vlan_dev_vlan_id(dev); 774 if (hoplimit) 775 *hoplimit = dev_addr.hoplimit; 776 dev_put(dev); 777 return ret; 778 } 779 EXPORT_SYMBOL(rdma_addr_find_l2_eth_by_grh); 780 781 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id) 782 { 783 int ret = 0; 784 struct rdma_dev_addr dev_addr; 785 union { 786 struct sockaddr _sockaddr; 787 struct sockaddr_in _sockaddr_in; 788 struct sockaddr_in6 _sockaddr_in6; 789 } gid_addr; 790 791 rdma_gid2ip(&gid_addr._sockaddr, sgid); 792 793 memset(&dev_addr, 0, sizeof(dev_addr)); 794 dev_addr.net = TD_TO_VNET(curthread); 795 ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id); 796 if (ret) 797 return ret; 798 799 memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN); 800 return ret; 801 } 802 EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid); 803 804 int addr_init(void) 805 { 806 addr_wq = alloc_workqueue("ib_addr", WQ_MEM_RECLAIM, 0); 807 if (!addr_wq) 808 return -ENOMEM; 809 810 rdma_addr_register_client(&self); 811 812 return 0; 813 } 814 815 void addr_cleanup(void) 816 { 817 rdma_addr_unregister_client(&self); 818 destroy_workqueue(addr_wq); 819 } 820