sys/ofed/drivers/infiniband/core/addr.c

   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 <linux/notifier.h>
  42 #include <net/route.h>
  43 #include <net/netevent.h>
  44 #include <rdma/ib_addr.h>
  45 #include <netinet/if_ether.h>
  46 #include <netinet6/scope6_var.h>
  47
  48
  49 MODULE_AUTHOR("Sean Hefty");
  50 MODULE_DESCRIPTION("IB Address Translation");
  51 MODULE_LICENSE("Dual BSD/GPL");
  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 struct delayed_work work;
  71 static struct workqueue_struct *addr_wq;
  72
  73 static struct rdma_addr_client self;
  74 void rdma_addr_register_client(struct rdma_addr_client *client)
  75 {
  76         atomic_set(&client->refcount, 1);
  77         init_completion(&client->comp);
  78 }
  79 EXPORT_SYMBOL(rdma_addr_register_client);
  80
  81 static inline void put_client(struct rdma_addr_client *client)
  82 {
  83         if (atomic_dec_and_test(&client->refcount))
  84                 complete(&client->comp);
  85 }
  86
  87 void rdma_addr_unregister_client(struct rdma_addr_client *client)
  88 {
  89         put_client(client);
  90         wait_for_completion(&client->comp);
  91 }
  92 EXPORT_SYMBOL(rdma_addr_unregister_client);
  93
  94 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct ifnet *dev,
  95                      const unsigned char *dst_dev_addr)
  96 {
  97         if (dev->if_type == IFT_INFINIBAND)
  98                 dev_addr->dev_type = ARPHRD_INFINIBAND;
  99         else if (dev->if_type == IFT_ETHER)
 100                 dev_addr->dev_type = ARPHRD_ETHER;
 101         else
 102                 dev_addr->dev_type = 0;
 103         memcpy(dev_addr->src_dev_addr, IF_LLADDR(dev), dev->if_addrlen);
 104         memcpy(dev_addr->broadcast, __DECONST(char *, dev->if_broadcastaddr),
 105             dev->if_addrlen);
 106         if (dst_dev_addr)
 107                 memcpy(dev_addr->dst_dev_addr, dst_dev_addr, dev->if_addrlen);
 108         dev_addr->bound_dev_if = dev->if_index;
 109         return 0;
 110 }
 111 EXPORT_SYMBOL(rdma_copy_addr);
 112
 113 #define SCOPE_ID_CACHE(_scope_id, _addr6) do {          \
 114         (_addr6)->sin6_addr.s6_addr[3] = (_scope_id);   \
 115         (_addr6)->sin6_scope_id = 0; } while (0)
 116
 117 #define SCOPE_ID_RESTORE(_scope_id, _addr6) do {        \
 118         (_addr6)->sin6_scope_id = (_scope_id);          \
 119         (_addr6)->sin6_addr.s6_addr[3] = 0; } while (0)
 120
 121 int rdma_translate_ip(struct sockaddr *addr, struct rdma_dev_addr *dev_addr,
 122                       u16 *vlan_id)
 123 {
 124         struct net_device *dev;
 125         int ret = -EADDRNOTAVAIL;
 126
 127         if (dev_addr->bound_dev_if) {
 128                 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 129                 if (!dev)
 130                         return -ENODEV;
 131                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 132                 dev_put(dev);
 133                 return ret;
 134         }
 135
 136         switch (addr->sa_family) {
 137         case AF_INET:
 138                 dev = ip_dev_find(&init_net,
 139                         ((struct sockaddr_in *) addr)->sin_addr.s_addr);
 140
 141                 if (!dev)
 142                         return ret;
 143
 144                 ret = rdma_copy_addr(dev_addr, dev, NULL);
 145                 if (vlan_id)
 146                         *vlan_id = rdma_vlan_dev_vlan_id(dev);
 147                 dev_put(dev);
 148                 break;
 149
 150 #if defined(INET6)
 151         case AF_INET6:
 152                 {
 153                         struct sockaddr_in6 *sin6;
 154                         struct ifaddr *ifa;
 155                         in_port_t port;
 156                         uint32_t scope_id;
 157
 158                         sin6 = (struct sockaddr_in6 *)addr;
 159                         port = sin6->sin6_port;
 160                         sin6->sin6_port = 0;
 161                         scope_id = sin6->sin6_scope_id;
 162                         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 163                                 SCOPE_ID_CACHE(scope_id, sin6);
 164                         CURVNET_SET_QUIET(&init_net);
 165                         ifa = ifa_ifwithaddr(addr);
 166                         CURVNET_RESTORE();
 167                         sin6->sin6_port = port;
 168                         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 169                                 SCOPE_ID_RESTORE(scope_id, sin6);
 170                         if (ifa == NULL) {
 171                                 ret = -ENODEV;
 172                                 break;
 173                         }
 174                         ret = rdma_copy_addr(dev_addr, ifa->ifa_ifp, NULL);
 175                         if (vlan_id)
 176                                 *vlan_id = rdma_vlan_dev_vlan_id(ifa->ifa_ifp);
 177                         ifa_free(ifa);
 178                         break;
 179                 }
 180 #endif
 181         default:
 182                 break;
 183         }
 184         return ret;
 185 }
 186 EXPORT_SYMBOL(rdma_translate_ip);
 187
 188 static void set_timeout(unsigned long time)
 189 {
 190         int delay;      /* under FreeBSD ticks are 32-bit */
 191
 192         delay = time - jiffies;
 193         if (delay <= 0)
 194                 delay = 1;
 195
 196         mod_delayed_work(addr_wq, &work, delay);
 197 }
 198
 199 static void queue_req(struct addr_req *req)
 200 {
 201         struct addr_req *temp_req;
 202
 203         mutex_lock(&lock);
 204         list_for_each_entry_reverse(temp_req, &req_list, list) {
 205                 if (time_after_eq(req->timeout, temp_req->timeout))
 206                         break;
 207         }
 208
 209         list_add(&req->list, &temp_req->list);
 210
 211         if (req_list.next == &req->list)
 212                 set_timeout(req->timeout);
 213         mutex_unlock(&lock);
 214 }
 215
 216 static int addr_resolve(struct sockaddr *src_in,
 217                         struct sockaddr *dst_in,
 218                         struct rdma_dev_addr *addr)
 219 {
 220         struct sockaddr_in *sin;
 221         struct sockaddr_in6 *sin6;
 222         struct ifaddr *ifa;
 223         struct ifnet *ifp;
 224         struct rtentry *rte;
 225 #if defined(INET) || defined(INET6)
 226         in_port_t port;
 227 #endif
 228 #ifdef INET6
 229         uint32_t scope_id;
 230 #endif
 231         u_char edst[MAX_ADDR_LEN];
 232         int multi;
 233         int bcast;
 234         int is_gw = 0;
 235         int error = 0;
 236
 237         CURVNET_SET_QUIET(&init_net);
 238
 239         /*
 240          * Determine whether the address is unicast, multicast, or broadcast
 241          * and whether the source interface is valid.
 242          */
 243         multi = 0;
 244         bcast = 0;
 245         sin = NULL;
 246         sin6 = NULL;
 247         ifp = NULL;
 248         rte = NULL;
 249         ifa = NULL;
 250         ifp = NULL;
 251         memset(edst, 0, sizeof(edst));
 252 #ifdef INET6
 253         scope_id = -1U;
 254 #endif
 255
 256         switch (dst_in->sa_family) {
 257 #ifdef INET
 258         case AF_INET:
 259                 sin = (struct sockaddr_in *)dst_in;
 260                 if (sin->sin_addr.s_addr == INADDR_BROADCAST)
 261                         bcast = 1;
 262                 if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
 263                         multi = 1;
 264                 sin = (struct sockaddr_in *)src_in;
 265                 if (sin->sin_addr.s_addr != INADDR_ANY) {
 266                         /*
 267                          * Address comparison fails if the port is set
 268                          * cache it here to be restored later.
 269                          */
 270                         port = sin->sin_port;
 271                         sin->sin_port = 0;
 272                         memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 273
 274                         /*
 275                          * If we have a source address to use look it
 276                          * up first and verify that it is a local
 277                          * interface:
 278                          */
 279                         CURVNET_SET_QUIET(&init_net);
 280                         ifa = ifa_ifwithaddr(src_in);
 281                         CURVNET_RESTORE();
 282                         sin->sin_port = port;
 283                         if (ifa == NULL) {
 284                                 error = ENETUNREACH;
 285                                 goto done;
 286                         }
 287                         ifp = ifa->ifa_ifp;
 288                         ifa_free(ifa);
 289                         if (bcast || multi)
 290                                 goto mcast;
 291                 }
 292                 break;
 293 #endif
 294 #ifdef INET6
 295         case AF_INET6:
 296                 sin6 = (struct sockaddr_in6 *)dst_in;
 297                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 298                         multi = 1;
 299                 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
 300                         /*
 301                          * The IB address comparison fails if the
 302                          * scope ID is set and not part of the addr:
 303                          */
 304                         scope_id = sin6->sin6_scope_id;
 305                         if (scope_id < 256)
 306                                 SCOPE_ID_CACHE(scope_id, sin6);
 307                 }
 308                 sin6 = (struct sockaddr_in6 *)src_in;
 309                 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 310                         port = sin6->sin6_port;
 311                         sin6->sin6_port = 0;
 312                         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
 313                                 if (scope_id < 256)
 314                                         SCOPE_ID_CACHE(scope_id, sin6);
 315                         }
 316
 317                         /*
 318                          * If we have a source address to use look it
 319                          * up first and verify that it is a local
 320                          * interface:
 321                          */
 322                         CURVNET_SET_QUIET(&init_net);
 323                         ifa = ifa_ifwithaddr(src_in);
 324                         CURVNET_RESTORE();
 325                         sin6->sin6_port = port;
 326                         if (ifa == NULL) {
 327                                 error = ENETUNREACH;
 328                                 goto done;
 329                         }
 330                         ifp = ifa->ifa_ifp;
 331                         ifa_free(ifa);
 332                         if (bcast || multi)
 333                                 goto mcast;
 334                 }
 335                 break;
 336 #endif
 337         default:
 338                 error = EINVAL;
 339                 goto done;
 340         }
 341         /*
 342          * Make sure the route exists and has a valid link.
 343          */
 344         rte = rtalloc1(dst_in, 1, 0);
 345         if (rte == NULL || rte->rt_ifp == NULL || !RT_LINK_IS_UP(rte->rt_ifp)) {
 346                 if (rte)
 347                         RTFREE_LOCKED(rte);
 348                 error = EHOSTUNREACH;
 349                 goto done;
 350         }
 351         if (rte->rt_flags & RTF_GATEWAY)
 352                 is_gw = 1;
 353         /*
 354          * If it's not multicast or broadcast and the route doesn't match the
 355          * requested interface return unreachable.  Otherwise fetch the
 356          * correct interface pointer and unlock the route.
 357          */
 358         if (multi || bcast) {
 359                 if (ifp == NULL) {
 360                         ifp = rte->rt_ifp;
 361                         /* rt_ifa holds the route answer source address */
 362                         ifa = rte->rt_ifa;
 363                 }
 364                 RTFREE_LOCKED(rte);
 365         } else if (ifp && ifp != rte->rt_ifp) {
 366                 RTFREE_LOCKED(rte);
 367                 error = ENETUNREACH;
 368                 goto done;
 369         } else {
 370                 if (ifp == NULL) {
 371                         ifp = rte->rt_ifp;
 372                         ifa = rte->rt_ifa;
 373                 }
 374                 RT_UNLOCK(rte);
 375         }
 376 #if defined(INET) || defined(INET6)
 377 mcast:
 378 #endif
 379         if (bcast) {
 380                 memcpy(edst, ifp->if_broadcastaddr, ifp->if_addrlen);
 381                 goto done;
 382         } else if (multi) {
 383                 struct sockaddr *llsa;
 384                 struct sockaddr_dl sdl;
 385
 386                 sdl.sdl_len = sizeof(sdl);
 387                 llsa = (struct sockaddr *)&sdl;
 388
 389                 if (ifp->if_resolvemulti == NULL) {
 390                         error = EOPNOTSUPP;
 391                         goto done;
 392                 }
 393                 error = ifp->if_resolvemulti(ifp, &llsa, dst_in);
 394                 if (error == 0) {
 395                         memcpy(edst, LLADDR((struct sockaddr_dl *)llsa),
 396                             ifp->if_addrlen);
 397                 }
 398                 goto done;
 399         }
 400         /*
 401          * Resolve the link local address.
 402          */
 403         switch (dst_in->sa_family) {
 404 #ifdef INET
 405         case AF_INET:
 406                 error = arpresolve(ifp, is_gw, NULL,
 407                     is_gw ? rte->rt_gateway : dst_in, edst, NULL, NULL);
 408                 break;
 409 #endif
 410 #ifdef INET6
 411         case AF_INET6:
 412                 error = nd6_resolve(ifp, is_gw, NULL,
 413                     is_gw ? rte->rt_gateway : dst_in, edst, NULL, NULL);
 414                 break;
 415 #endif
 416         default:
 417                 KASSERT(0, ("rdma_addr_resolve: Unreachable"));
 418                 error = EINVAL;
 419                 break;
 420         }
 421         RTFREE(rte);
 422 done:
 423         if (error == 0)
 424                 error = -rdma_copy_addr(addr, ifp, edst);
 425         if (error == 0)
 426                 memcpy(src_in, ifa->ifa_addr, ip_addr_size(ifa->ifa_addr));
 427 #ifdef INET6
 428         if (scope_id < 256) {
 429                 sin6 = (struct sockaddr_in6 *)src_in;
 430                 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 431                         SCOPE_ID_RESTORE(scope_id, sin6);
 432                 sin6 = (struct sockaddr_in6 *)dst_in;
 433                 SCOPE_ID_RESTORE(scope_id, sin6);
 434         }
 435 #endif
 436         if (error == EWOULDBLOCK)
 437                 error = ENODATA;
 438
 439         CURVNET_RESTORE();
 440         return -error;
 441 }
 442
 443 static void process_req(struct work_struct *work)
 444 {
 445         struct addr_req *req, *temp_req;
 446         struct sockaddr *src_in, *dst_in;
 447         struct list_head done_list;
 448
 449         INIT_LIST_HEAD(&done_list);
 450
 451         mutex_lock(&lock);
 452         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 453                 if (req->status == -ENODATA) {
 454                         src_in = (struct sockaddr *) &req->src_addr;
 455                         dst_in = (struct sockaddr *) &req->dst_addr;
 456                         req->status = addr_resolve(src_in, dst_in, req->addr);
 457                         if (req->status && time_after_eq(jiffies, req->timeout))
 458                                 req->status = -ETIMEDOUT;
 459                         else if (req->status == -ENODATA)
 460                                 continue;
 461                 }
 462                 list_move_tail(&req->list, &done_list);
 463         }
 464
 465         if (!list_empty(&req_list)) {
 466                 req = list_entry(req_list.next, struct addr_req, list);
 467                 set_timeout(req->timeout);
 468         }
 469         mutex_unlock(&lock);
 470
 471         list_for_each_entry_safe(req, temp_req, &done_list, list) {
 472                 list_del(&req->list);
 473                 req->callback(req->status, (struct sockaddr *) &req->src_addr,
 474                         req->addr, req->context);
 475                 put_client(req->client);
 476                 kfree(req);
 477         }
 478 }
 479
 480 int rdma_resolve_ip(struct rdma_addr_client *client,
 481                     struct sockaddr *src_addr, struct sockaddr *dst_addr,
 482                     struct rdma_dev_addr *addr, int timeout_ms,
 483                     void (*callback)(int status, struct sockaddr *src_addr,
 484                                      struct rdma_dev_addr *addr, void *context),
 485                     void *context)
 486 {
 487         struct sockaddr *src_in, *dst_in;
 488         struct addr_req *req;
 489         int ret = 0;
 490
 491         req = kzalloc(sizeof *req, GFP_KERNEL);
 492         if (!req)
 493                 return -ENOMEM;
 494
 495         src_in = (struct sockaddr *) &req->src_addr;
 496         dst_in = (struct sockaddr *) &req->dst_addr;
 497
 498         if (src_addr) {
 499                 if (src_addr->sa_family != dst_addr->sa_family) {
 500                         ret = -EINVAL;
 501                         goto err;
 502                 }
 503
 504                 memcpy(src_in, src_addr, ip_addr_size(src_addr));
 505         } else {
 506                 src_in->sa_family = dst_addr->sa_family;
 507         }
 508
 509         memcpy(dst_in, dst_addr, ip_addr_size(dst_addr));
 510         req->addr = addr;
 511         req->callback = callback;
 512         req->context = context;
 513         req->client = client;
 514         atomic_inc(&client->refcount);
 515
 516         req->status = addr_resolve(src_in, dst_in, addr);
 517         switch (req->status) {
 518         case 0:
 519                 req->timeout = jiffies;
 520                 queue_req(req);
 521                 break;
 522         case -ENODATA:
 523                 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
 524                 queue_req(req);
 525                 break;
 526         default:
 527                 ret = req->status;
 528                 atomic_dec(&client->refcount);
 529                 goto err;
 530         }
 531         return ret;
 532 err:
 533         kfree(req);
 534         return ret;
 535 }
 536 EXPORT_SYMBOL(rdma_resolve_ip);
 537
 538 void rdma_addr_cancel(struct rdma_dev_addr *addr)
 539 {
 540         struct addr_req *req, *temp_req;
 541
 542         mutex_lock(&lock);
 543         list_for_each_entry_safe(req, temp_req, &req_list, list) {
 544                 if (req->addr == addr) {
 545                         req->status = -ECANCELED;
 546                         req->timeout = jiffies;
 547                         list_move(&req->list, &req_list);
 548                         set_timeout(req->timeout);
 549                         break;
 550                 }
 551         }
 552         mutex_unlock(&lock);
 553 }
 554 EXPORT_SYMBOL(rdma_addr_cancel);
 555
 556 struct resolve_cb_context {
 557         struct rdma_dev_addr *addr;
 558         struct completion comp;
 559 };
 560
 561 static void resolve_cb(int status, struct sockaddr *src_addr,
 562              struct rdma_dev_addr *addr, void *context)
 563 {
 564         memcpy(((struct resolve_cb_context *)context)->addr, addr, sizeof(struct
 565                                 rdma_dev_addr));
 566         complete(&((struct resolve_cb_context *)context)->comp);
 567 }
 568
 569 int rdma_addr_find_dmac_by_grh(union ib_gid *sgid, union ib_gid *dgid, u8 *dmac,
 570                                u16 *vlan_id, u32 scope_id)
 571 {
 572         int ret = 0;
 573         struct rdma_dev_addr dev_addr;
 574         struct resolve_cb_context ctx;
 575         struct net_device *dev;
 576
 577         union {
 578                 struct sockaddr     _sockaddr;
 579                 struct sockaddr_in  _sockaddr_in;
 580                 struct sockaddr_in6 _sockaddr_in6;
 581         } sgid_addr, dgid_addr;
 582
 583
 584         ret = rdma_gid2ip(&sgid_addr._sockaddr, sgid, scope_id);
 585         if (ret)
 586                 return ret;
 587
 588         ret = rdma_gid2ip(&dgid_addr._sockaddr, dgid, scope_id);
 589         if (ret)
 590                 return ret;
 591
 592         memset(&dev_addr, 0, sizeof(dev_addr));
 593
 594         ctx.addr = &dev_addr;
 595         init_completion(&ctx.comp);
 596         ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
 597                         &dev_addr, 1000, resolve_cb, &ctx);
 598         if (ret)
 599                 return ret;
 600
 601         wait_for_completion(&ctx.comp);
 602
 603         memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
 604         dev = dev_get_by_index(&init_net, dev_addr.bound_dev_if);
 605         if (!dev)
 606                 return -ENODEV;
 607         if (vlan_id)
 608                 *vlan_id = rdma_vlan_dev_vlan_id(dev);
 609         dev_put(dev);
 610         return ret;
 611 }
 612 EXPORT_SYMBOL(rdma_addr_find_dmac_by_grh);
 613
 614 u32 rdma_get_ipv6_scope_id(struct ib_device *ib, u8 port_num)
 615 {
 616 #ifdef INET6
 617         struct ifnet *ifp;
 618         if (ib->get_netdev == NULL)
 619                 return (-1U);
 620         ifp = ib->get_netdev(ib, port_num);
 621         if (ifp == NULL)
 622                 return (-1U);
 623         return (in6_getscopezone(ifp, IPV6_ADDR_SCOPE_LINKLOCAL));
 624 #else
 625         return (-1U);
 626 #endif
 627 }
 628
 629 int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id,
 630     u32 scope_id)
 631 {
 632         int ret = 0;
 633         struct rdma_dev_addr dev_addr;
 634         union {
 635                 struct sockaddr     _sockaddr;
 636                 struct sockaddr_in  _sockaddr_in;
 637                 struct sockaddr_in6 _sockaddr_in6;
 638         } gid_addr;
 639
 640         ret = rdma_gid2ip(&gid_addr._sockaddr, sgid, scope_id);
 641         if (ret)
 642                 return ret;
 643         memset(&dev_addr, 0, sizeof(dev_addr));
 644         ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id);
 645         if (ret)
 646                 return ret;
 647
 648         memcpy(smac, dev_addr.src_dev_addr, ETH_ALEN);
 649         return ret;
 650 }
 651 EXPORT_SYMBOL(rdma_addr_find_smac_by_sgid);
 652
 653 static int netevent_callback(struct notifier_block *self, unsigned long event,
 654         void *ctx)
 655 {
 656         if (event == NETEVENT_NEIGH_UPDATE) {
 657                         set_timeout(jiffies);
 658                 }
 659         return 0;
 660 }
 661
 662 static struct notifier_block nb = {
 663         .notifier_call = netevent_callback
 664 };
 665
 666 static int __init addr_init(void)
 667 {
 668         INIT_DELAYED_WORK(&work, process_req);
 669         addr_wq = create_singlethread_workqueue("ib_addr");
 670         if (!addr_wq)
 671                 return -ENOMEM;
 672
 673         register_netevent_notifier(&nb);
 674         rdma_addr_register_client(&self);
 675         return 0;
 676 }
 677
 678 static void __exit addr_cleanup(void)
 679 {
 680         rdma_addr_unregister_client(&self);
 681         unregister_netevent_notifier(&nb);
 682         destroy_workqueue(addr_wq);
 683 }
 684
 685 module_init(addr_init);
 686 module_exit(addr_cleanup);