drivers/infiniband/core/roce_gid_mgmt.c

   1 /*
   2  * Copyright (c) 2015, Mellanox Technologies inc.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include "core_priv.h"
  34
  35 #include <linux/in.h>
  36 #include <linux/in6.h>
  37
  38 /* For in6_dev_get/in6_dev_put */
  39 #include <net/addrconf.h>
  40 #include <net/bonding.h>
  41
  42 #include <rdma/ib_cache.h>
  43 #include <rdma/ib_addr.h>
  44
  45 enum gid_op_type {
  46         GID_DEL = 0,
  47         GID_ADD
  48 };
  49
  50 struct update_gid_event_work {
  51         struct work_struct work;
  52         union ib_gid       gid;
  53         struct ib_gid_attr gid_attr;
  54         enum gid_op_type gid_op;
  55 };
  56
  57 #define ROCE_NETDEV_CALLBACK_SZ         3
  58 struct netdev_event_work_cmd {
  59         roce_netdev_callback    cb;
  60         roce_netdev_filter      filter;
  61         struct net_device       *ndev;
  62         struct net_device       *filter_ndev;
  63 };
  64
  65 struct netdev_event_work {
  66         struct work_struct              work;
  67         struct netdev_event_work_cmd    cmds[ROCE_NETDEV_CALLBACK_SZ];
  68 };
  69
  70 static void update_gid(enum gid_op_type gid_op, struct ib_device *ib_dev,
  71                        u8 port, union ib_gid *gid,
  72                        struct ib_gid_attr *gid_attr)
  73 {
  74         switch (gid_op) {
  75         case GID_ADD:
  76                 ib_cache_gid_add(ib_dev, port, gid, gid_attr);
  77                 break;
  78         case GID_DEL:
  79                 ib_cache_gid_del(ib_dev, port, gid, gid_attr);
  80                 break;
  81         }
  82 }
  83
  84 enum bonding_slave_state {
  85         BONDING_SLAVE_STATE_ACTIVE      = 1UL << 0,
  86         BONDING_SLAVE_STATE_INACTIVE    = 1UL << 1,
  87         /* No primary slave or the device isn't a slave in bonding */
  88         BONDING_SLAVE_STATE_NA          = 1UL << 2,
  89 };
  90
  91 static enum bonding_slave_state is_eth_active_slave_of_bonding_rcu(struct net_device *dev,
  92                                                                    struct net_device *upper)
  93 {
  94         if (upper && netif_is_bond_master(upper)) {
  95                 struct net_device *pdev =
  96                         bond_option_active_slave_get_rcu(netdev_priv(upper));
  97
  98                 if (pdev)
  99                         return dev == pdev ? BONDING_SLAVE_STATE_ACTIVE :
 100                                 BONDING_SLAVE_STATE_INACTIVE;
 101         }
 102
 103         return BONDING_SLAVE_STATE_NA;
 104 }
 105
 106 static bool is_upper_dev_rcu(struct net_device *dev, struct net_device *upper)
 107 {
 108         struct net_device *_upper = NULL;
 109         struct list_head *iter;
 110
 111         netdev_for_each_all_upper_dev_rcu(dev, _upper, iter)
 112                 if (_upper == upper)
 113                         break;
 114
 115         return _upper == upper;
 116 }
 117
 118 #define REQUIRED_BOND_STATES            (BONDING_SLAVE_STATE_ACTIVE |   \
 119                                          BONDING_SLAVE_STATE_NA)
 120 static int is_eth_port_of_netdev(struct ib_device *ib_dev, u8 port,
 121                                  struct net_device *rdma_ndev, void *cookie)
 122 {
 123         struct net_device *event_ndev = (struct net_device *)cookie;
 124         struct net_device *real_dev;
 125         int res;
 126
 127         if (!rdma_ndev)
 128                 return 0;
 129
 130         rcu_read_lock();
 131         real_dev = rdma_vlan_dev_real_dev(event_ndev);
 132         if (!real_dev)
 133                 real_dev = event_ndev;
 134
 135         res = ((is_upper_dev_rcu(rdma_ndev, event_ndev) &&
 136                (is_eth_active_slave_of_bonding_rcu(rdma_ndev, real_dev) &
 137                 REQUIRED_BOND_STATES)) ||
 138                real_dev == rdma_ndev);
 139
 140         rcu_read_unlock();
 141         return res;
 142 }
 143
 144 static int is_eth_port_inactive_slave(struct ib_device *ib_dev, u8 port,
 145                                       struct net_device *rdma_ndev, void *cookie)
 146 {
 147         struct net_device *master_dev;
 148         int res;
 149
 150         if (!rdma_ndev)
 151                 return 0;
 152
 153         rcu_read_lock();
 154         master_dev = netdev_master_upper_dev_get_rcu(rdma_ndev);
 155         res = is_eth_active_slave_of_bonding_rcu(rdma_ndev, master_dev) ==
 156                 BONDING_SLAVE_STATE_INACTIVE;
 157         rcu_read_unlock();
 158
 159         return res;
 160 }
 161
 162 static int pass_all_filter(struct ib_device *ib_dev, u8 port,
 163                            struct net_device *rdma_ndev, void *cookie)
 164 {
 165         return 1;
 166 }
 167
 168 static int upper_device_filter(struct ib_device *ib_dev, u8 port,
 169                                struct net_device *rdma_ndev, void *cookie)
 170 {
 171         struct net_device *event_ndev = (struct net_device *)cookie;
 172         int res;
 173
 174         if (!rdma_ndev)
 175                 return 0;
 176
 177         if (rdma_ndev == event_ndev)
 178                 return 1;
 179
 180         rcu_read_lock();
 181         res = is_upper_dev_rcu(rdma_ndev, event_ndev);
 182         rcu_read_unlock();
 183
 184         return res;
 185 }
 186
 187 static void update_gid_ip(enum gid_op_type gid_op,
 188                           struct ib_device *ib_dev,
 189                           u8 port, struct net_device *ndev,
 190                           struct sockaddr *addr)
 191 {
 192         union ib_gid gid;
 193         struct ib_gid_attr gid_attr;
 194
 195         rdma_ip2gid(addr, &gid);
 196         memset(&gid_attr, 0, sizeof(gid_attr));
 197         gid_attr.ndev = ndev;
 198
 199         update_gid(gid_op, ib_dev, port, &gid, &gid_attr);
 200 }
 201
 202 static void enum_netdev_default_gids(struct ib_device *ib_dev,
 203                                      u8 port, struct net_device *event_ndev,
 204                                      struct net_device *rdma_ndev)
 205 {
 206         rcu_read_lock();
 207         if (!rdma_ndev ||
 208             ((rdma_ndev != event_ndev &&
 209               !is_upper_dev_rcu(rdma_ndev, event_ndev)) ||
 210              is_eth_active_slave_of_bonding_rcu(rdma_ndev,
 211                                                 netdev_master_upper_dev_get_rcu(rdma_ndev)) ==
 212              BONDING_SLAVE_STATE_INACTIVE)) {
 213                 rcu_read_unlock();
 214                 return;
 215         }
 216         rcu_read_unlock();
 217
 218         ib_cache_gid_set_default_gid(ib_dev, port, rdma_ndev,
 219                                      IB_CACHE_GID_DEFAULT_MODE_SET);
 220 }
 221
 222 static void bond_delete_netdev_default_gids(struct ib_device *ib_dev,
 223                                             u8 port,
 224                                             struct net_device *event_ndev,
 225                                             struct net_device *rdma_ndev)
 226 {
 227         struct net_device *real_dev = rdma_vlan_dev_real_dev(event_ndev);
 228
 229         if (!rdma_ndev)
 230                 return;
 231
 232         if (!real_dev)
 233                 real_dev = event_ndev;
 234
 235         rcu_read_lock();
 236
 237         if (is_upper_dev_rcu(rdma_ndev, event_ndev) &&
 238             is_eth_active_slave_of_bonding_rcu(rdma_ndev, real_dev) ==
 239             BONDING_SLAVE_STATE_INACTIVE) {
 240                 rcu_read_unlock();
 241
 242                 ib_cache_gid_set_default_gid(ib_dev, port, rdma_ndev,
 243                                              IB_CACHE_GID_DEFAULT_MODE_DELETE);
 244         } else {
 245                 rcu_read_unlock();
 246         }
 247 }
 248
 249 static void enum_netdev_ipv4_ips(struct ib_device *ib_dev,
 250                                  u8 port, struct net_device *ndev)
 251 {
 252         struct in_device *in_dev;
 253
 254         if (ndev->reg_state >= NETREG_UNREGISTERING)
 255                 return;
 256
 257         in_dev = in_dev_get(ndev);
 258         if (!in_dev)
 259                 return;
 260
 261         for_ifa(in_dev) {
 262                 struct sockaddr_in ip;
 263
 264                 ip.sin_family = AF_INET;
 265                 ip.sin_addr.s_addr = ifa->ifa_address;
 266                 update_gid_ip(GID_ADD, ib_dev, port, ndev,
 267                               (struct sockaddr *)&ip);
 268         }
 269         endfor_ifa(in_dev);
 270
 271         in_dev_put(in_dev);
 272 }
 273
 274 static void enum_netdev_ipv6_ips(struct ib_device *ib_dev,
 275                                  u8 port, struct net_device *ndev)
 276 {
 277         struct inet6_ifaddr *ifp;
 278         struct inet6_dev *in6_dev;
 279         struct sin6_list {
 280                 struct list_head        list;
 281                 struct sockaddr_in6     sin6;
 282         };
 283         struct sin6_list *sin6_iter;
 284         struct sin6_list *sin6_temp;
 285         struct ib_gid_attr gid_attr = {.ndev = ndev};
 286         LIST_HEAD(sin6_list);
 287
 288         if (ndev->reg_state >= NETREG_UNREGISTERING)
 289                 return;
 290
 291         in6_dev = in6_dev_get(ndev);
 292         if (!in6_dev)
 293                 return;
 294
 295         read_lock_bh(&in6_dev->lock);
 296         list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
 297                 struct sin6_list *entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 298
 299                 if (!entry) {
 300                         pr_warn("roce_gid_mgmt: couldn't allocate entry for IPv6 update\n");
 301                         continue;
 302                 }
 303
 304                 entry->sin6.sin6_family = AF_INET6;
 305                 entry->sin6.sin6_addr = ifp->addr;
 306                 list_add_tail(&entry->list, &sin6_list);
 307         }
 308         read_unlock_bh(&in6_dev->lock);
 309
 310         in6_dev_put(in6_dev);
 311
 312         list_for_each_entry_safe(sin6_iter, sin6_temp, &sin6_list, list) {
 313                 union ib_gid    gid;
 314
 315                 rdma_ip2gid((struct sockaddr *)&sin6_iter->sin6, &gid);
 316                 update_gid(GID_ADD, ib_dev, port, &gid, &gid_attr);
 317                 list_del(&sin6_iter->list);
 318                 kfree(sin6_iter);
 319         }
 320 }
 321
 322 static void _add_netdev_ips(struct ib_device *ib_dev, u8 port,
 323                             struct net_device *ndev)
 324 {
 325         enum_netdev_ipv4_ips(ib_dev, port, ndev);
 326         if (IS_ENABLED(CONFIG_IPV6))
 327                 enum_netdev_ipv6_ips(ib_dev, port, ndev);
 328 }
 329
 330 static void add_netdev_ips(struct ib_device *ib_dev, u8 port,
 331                            struct net_device *rdma_ndev, void *cookie)
 332 {
 333         struct net_device *event_ndev = (struct net_device *)cookie;
 334
 335         enum_netdev_default_gids(ib_dev, port, event_ndev, rdma_ndev);
 336         _add_netdev_ips(ib_dev, port, event_ndev);
 337 }
 338
 339 static void del_netdev_ips(struct ib_device *ib_dev, u8 port,
 340                            struct net_device *rdma_ndev, void *cookie)
 341 {
 342         struct net_device *event_ndev = (struct net_device *)cookie;
 343
 344         ib_cache_gid_del_all_netdev_gids(ib_dev, port, event_ndev);
 345 }
 346
 347 static void enum_all_gids_of_dev_cb(struct ib_device *ib_dev,
 348                                     u8 port,
 349                                     struct net_device *rdma_ndev,
 350                                     void *cookie)
 351 {
 352         struct net *net;
 353         struct net_device *ndev;
 354
 355         /* Lock the rtnl to make sure the netdevs does not move under
 356          * our feet
 357          */
 358         rtnl_lock();
 359         for_each_net(net)
 360                 for_each_netdev(net, ndev)
 361                         if (is_eth_port_of_netdev(ib_dev, port, rdma_ndev, ndev))
 362                                 add_netdev_ips(ib_dev, port, rdma_ndev, ndev);
 363         rtnl_unlock();
 364 }
 365
 366 /* This function will rescan all of the network devices in the system
 367  * and add their gids, as needed, to the relevant RoCE devices. */
 368 int roce_rescan_device(struct ib_device *ib_dev)
 369 {
 370         ib_enum_roce_netdev(ib_dev, pass_all_filter, NULL,
 371                             enum_all_gids_of_dev_cb, NULL);
 372
 373         return 0;
 374 }
 375
 376 static void callback_for_addr_gid_device_scan(struct ib_device *device,
 377                                               u8 port,
 378                                               struct net_device *rdma_ndev,
 379                                               void *cookie)
 380 {
 381         struct update_gid_event_work *parsed = cookie;
 382
 383         return update_gid(parsed->gid_op, device,
 384                           port, &parsed->gid,
 385                           &parsed->gid_attr);
 386 }
 387
 388 static void handle_netdev_upper(struct ib_device *ib_dev, u8 port,
 389                                 void *cookie,
 390                                 void (*handle_netdev)(struct ib_device *ib_dev,
 391                                                       u8 port,
 392                                                       struct net_device *ndev))
 393 {
 394         struct net_device *ndev = (struct net_device *)cookie;
 395         struct upper_list {
 396                 struct list_head list;
 397                 struct net_device *upper;
 398         };
 399         struct net_device *upper;
 400         struct list_head *iter;
 401         struct upper_list *upper_iter;
 402         struct upper_list *upper_temp;
 403         LIST_HEAD(upper_list);
 404
 405         rcu_read_lock();
 406         netdev_for_each_all_upper_dev_rcu(ndev, upper, iter) {
 407                 struct upper_list *entry = kmalloc(sizeof(*entry),
 408                                                    GFP_ATOMIC);
 409
 410                 if (!entry) {
 411                         pr_info("roce_gid_mgmt: couldn't allocate entry to delete ndev\n");
 412                         continue;
 413                 }
 414
 415                 list_add_tail(&entry->list, &upper_list);
 416                 dev_hold(upper);
 417                 entry->upper = upper;
 418         }
 419         rcu_read_unlock();
 420
 421         handle_netdev(ib_dev, port, ndev);
 422         list_for_each_entry_safe(upper_iter, upper_temp, &upper_list,
 423                                  list) {
 424                 handle_netdev(ib_dev, port, upper_iter->upper);
 425                 dev_put(upper_iter->upper);
 426                 list_del(&upper_iter->list);
 427                 kfree(upper_iter);
 428         }
 429 }
 430
 431 static void _roce_del_all_netdev_gids(struct ib_device *ib_dev, u8 port,
 432                                       struct net_device *event_ndev)
 433 {
 434         ib_cache_gid_del_all_netdev_gids(ib_dev, port, event_ndev);
 435 }
 436
 437 static void del_netdev_upper_ips(struct ib_device *ib_dev, u8 port,
 438                                  struct net_device *rdma_ndev, void *cookie)
 439 {
 440         handle_netdev_upper(ib_dev, port, cookie, _roce_del_all_netdev_gids);
 441 }
 442
 443 static void add_netdev_upper_ips(struct ib_device *ib_dev, u8 port,
 444                                  struct net_device *rdma_ndev, void *cookie)
 445 {
 446         handle_netdev_upper(ib_dev, port, cookie, _add_netdev_ips);
 447 }
 448
 449 static void del_netdev_default_ips_join(struct ib_device *ib_dev, u8 port,
 450                                         struct net_device *rdma_ndev,
 451                                         void *cookie)
 452 {
 453         struct net_device *master_ndev;
 454
 455         rcu_read_lock();
 456         master_ndev = netdev_master_upper_dev_get_rcu(rdma_ndev);
 457         if (master_ndev)
 458                 dev_hold(master_ndev);
 459         rcu_read_unlock();
 460
 461         if (master_ndev) {
 462                 bond_delete_netdev_default_gids(ib_dev, port, master_ndev,
 463                                                 rdma_ndev);
 464                 dev_put(master_ndev);
 465         }
 466 }
 467
 468 static void del_netdev_default_ips(struct ib_device *ib_dev, u8 port,
 469                                    struct net_device *rdma_ndev, void *cookie)
 470 {
 471         struct net_device *event_ndev = (struct net_device *)cookie;
 472
 473         bond_delete_netdev_default_gids(ib_dev, port, event_ndev, rdma_ndev);
 474 }
 475
 476 /* The following functions operate on all IB devices. netdevice_event and
 477  * addr_event execute ib_enum_all_roce_netdevs through a work.
 478  * ib_enum_all_roce_netdevs iterates through all IB devices.
 479  */
 480
 481 static void netdevice_event_work_handler(struct work_struct *_work)
 482 {
 483         struct netdev_event_work *work =
 484                 container_of(_work, struct netdev_event_work, work);
 485         unsigned int i;
 486
 487         for (i = 0; i < ARRAY_SIZE(work->cmds) && work->cmds[i].cb; i++) {
 488                 ib_enum_all_roce_netdevs(work->cmds[i].filter,
 489                                          work->cmds[i].filter_ndev,
 490                                          work->cmds[i].cb,
 491                                          work->cmds[i].ndev);
 492                 dev_put(work->cmds[i].ndev);
 493                 dev_put(work->cmds[i].filter_ndev);
 494         }
 495
 496         kfree(work);
 497 }
 498
 499 static int netdevice_queue_work(struct netdev_event_work_cmd *cmds,
 500                                 struct net_device *ndev)
 501 {
 502         unsigned int i;
 503         struct netdev_event_work *ndev_work =
 504                 kmalloc(sizeof(*ndev_work), GFP_KERNEL);
 505
 506         if (!ndev_work) {
 507                 pr_warn("roce_gid_mgmt: can't allocate work for netdevice_event\n");
 508                 return NOTIFY_DONE;
 509         }
 510
 511         memcpy(ndev_work->cmds, cmds, sizeof(ndev_work->cmds));
 512         for (i = 0; i < ARRAY_SIZE(ndev_work->cmds) && ndev_work->cmds[i].cb; i++) {
 513                 if (!ndev_work->cmds[i].ndev)
 514                         ndev_work->cmds[i].ndev = ndev;
 515                 if (!ndev_work->cmds[i].filter_ndev)
 516                         ndev_work->cmds[i].filter_ndev = ndev;
 517                 dev_hold(ndev_work->cmds[i].ndev);
 518                 dev_hold(ndev_work->cmds[i].filter_ndev);
 519         }
 520         INIT_WORK(&ndev_work->work, netdevice_event_work_handler);
 521
 522         queue_work(ib_wq, &ndev_work->work);
 523
 524         return NOTIFY_DONE;
 525 }
 526
 527 static const struct netdev_event_work_cmd add_cmd = {
 528         .cb = add_netdev_ips, .filter = is_eth_port_of_netdev};
 529 static const struct netdev_event_work_cmd add_cmd_upper_ips = {
 530         .cb = add_netdev_upper_ips, .filter = is_eth_port_of_netdev};
 531
 532 static void netdevice_event_changeupper(struct netdev_notifier_changeupper_info *changeupper_info,
 533                                         struct netdev_event_work_cmd *cmds)
 534 {
 535         static const struct netdev_event_work_cmd upper_ips_del_cmd = {
 536                 .cb = del_netdev_upper_ips, .filter = upper_device_filter};
 537         static const struct netdev_event_work_cmd bonding_default_del_cmd = {
 538                 .cb = del_netdev_default_ips, .filter = is_eth_port_inactive_slave};
 539
 540         if (changeupper_info->linking == false) {
 541                 cmds[0] = upper_ips_del_cmd;
 542                 cmds[0].ndev = changeupper_info->upper_dev;
 543                 cmds[1] = add_cmd;
 544         } else {
 545                 cmds[0] = bonding_default_del_cmd;
 546                 cmds[0].ndev = changeupper_info->upper_dev;
 547                 cmds[1] = add_cmd_upper_ips;
 548                 cmds[1].ndev = changeupper_info->upper_dev;
 549                 cmds[1].filter_ndev = changeupper_info->upper_dev;
 550         }
 551 }
 552
 553 static int netdevice_event(struct notifier_block *this, unsigned long event,
 554                            void *ptr)
 555 {
 556         static const struct netdev_event_work_cmd del_cmd = {
 557                 .cb = del_netdev_ips, .filter = pass_all_filter};
 558         static const struct netdev_event_work_cmd bonding_default_del_cmd_join = {
 559                 .cb = del_netdev_default_ips_join, .filter = is_eth_port_inactive_slave};
 560         static const struct netdev_event_work_cmd default_del_cmd = {
 561                 .cb = del_netdev_default_ips, .filter = pass_all_filter};
 562         static const struct netdev_event_work_cmd bonding_event_ips_del_cmd = {
 563                 .cb = del_netdev_upper_ips, .filter = upper_device_filter};
 564         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
 565         struct netdev_event_work_cmd cmds[ROCE_NETDEV_CALLBACK_SZ] = { {NULL} };
 566
 567         if (ndev->type != ARPHRD_ETHER)
 568                 return NOTIFY_DONE;
 569
 570         switch (event) {
 571         case NETDEV_REGISTER:
 572         case NETDEV_UP:
 573                 cmds[0] = bonding_default_del_cmd_join;
 574                 cmds[1] = add_cmd;
 575                 break;
 576
 577         case NETDEV_UNREGISTER:
 578                 if (ndev->reg_state < NETREG_UNREGISTERED)
 579                         cmds[0] = del_cmd;
 580                 else
 581                         return NOTIFY_DONE;
 582                 break;
 583
 584         case NETDEV_CHANGEADDR:
 585                 cmds[0] = default_del_cmd;
 586                 cmds[1] = add_cmd;
 587                 break;
 588
 589         case NETDEV_CHANGEUPPER:
 590                 netdevice_event_changeupper(
 591                         container_of(ptr, struct netdev_notifier_changeupper_info, info),
 592                         cmds);
 593                 break;
 594
 595         case NETDEV_BONDING_FAILOVER:
 596                 cmds[0] = bonding_event_ips_del_cmd;
 597                 cmds[1] = bonding_default_del_cmd_join;
 598                 cmds[2] = add_cmd_upper_ips;
 599                 break;
 600
 601         default:
 602                 return NOTIFY_DONE;
 603         }
 604
 605         return netdevice_queue_work(cmds, ndev);
 606 }
 607
 608 static void update_gid_event_work_handler(struct work_struct *_work)
 609 {
 610         struct update_gid_event_work *work =
 611                 container_of(_work, struct update_gid_event_work, work);
 612
 613         ib_enum_all_roce_netdevs(is_eth_port_of_netdev, work->gid_attr.ndev,
 614                                  callback_for_addr_gid_device_scan, work);
 615
 616         dev_put(work->gid_attr.ndev);
 617         kfree(work);
 618 }
 619
 620 static int addr_event(struct notifier_block *this, unsigned long event,
 621                       struct sockaddr *sa, struct net_device *ndev)
 622 {
 623         struct update_gid_event_work *work;
 624         enum gid_op_type gid_op;
 625
 626         if (ndev->type != ARPHRD_ETHER)
 627                 return NOTIFY_DONE;
 628
 629         switch (event) {
 630         case NETDEV_UP:
 631                 gid_op = GID_ADD;
 632                 break;
 633
 634         case NETDEV_DOWN:
 635                 gid_op = GID_DEL;
 636                 break;
 637
 638         default:
 639                 return NOTIFY_DONE;
 640         }
 641
 642         work = kmalloc(sizeof(*work), GFP_ATOMIC);
 643         if (!work) {
 644                 pr_warn("roce_gid_mgmt: Couldn't allocate work for addr_event\n");
 645                 return NOTIFY_DONE;
 646         }
 647
 648         INIT_WORK(&work->work, update_gid_event_work_handler);
 649
 650         rdma_ip2gid(sa, &work->gid);
 651         work->gid_op = gid_op;
 652
 653         memset(&work->gid_attr, 0, sizeof(work->gid_attr));
 654         dev_hold(ndev);
 655         work->gid_attr.ndev   = ndev;
 656
 657         queue_work(ib_wq, &work->work);
 658
 659         return NOTIFY_DONE;
 660 }
 661
 662 static int inetaddr_event(struct notifier_block *this, unsigned long event,
 663                           void *ptr)
 664 {
 665         struct sockaddr_in      in;
 666         struct net_device       *ndev;
 667         struct in_ifaddr        *ifa = ptr;
 668
 669         in.sin_family = AF_INET;
 670         in.sin_addr.s_addr = ifa->ifa_address;
 671         ndev = ifa->ifa_dev->dev;
 672
 673         return addr_event(this, event, (struct sockaddr *)&in, ndev);
 674 }
 675
 676 static int inet6addr_event(struct notifier_block *this, unsigned long event,
 677                            void *ptr)
 678 {
 679         struct sockaddr_in6     in6;
 680         struct net_device       *ndev;
 681         struct inet6_ifaddr     *ifa6 = ptr;
 682
 683         in6.sin6_family = AF_INET6;
 684         in6.sin6_addr = ifa6->addr;
 685         ndev = ifa6->idev->dev;
 686
 687         return addr_event(this, event, (struct sockaddr *)&in6, ndev);
 688 }
 689
 690 static struct notifier_block nb_netdevice = {
 691         .notifier_call = netdevice_event
 692 };
 693
 694 static struct notifier_block nb_inetaddr = {
 695         .notifier_call = inetaddr_event
 696 };
 697
 698 static struct notifier_block nb_inet6addr = {
 699         .notifier_call = inet6addr_event
 700 };
 701
 702 int __init roce_gid_mgmt_init(void)
 703 {
 704         register_inetaddr_notifier(&nb_inetaddr);
 705         if (IS_ENABLED(CONFIG_IPV6))
 706                 register_inet6addr_notifier(&nb_inet6addr);
 707         /* We relay on the netdevice notifier to enumerate all
 708          * existing devices in the system. Register to this notifier
 709          * last to make sure we will not miss any IP add/del
 710          * callbacks.
 711          */
 712         register_netdevice_notifier(&nb_netdevice);
 713
 714         return 0;
 715 }
 716
 717 void __exit roce_gid_mgmt_cleanup(void)
 718 {
 719         if (IS_ENABLED(CONFIG_IPV6))
 720                 unregister_inet6addr_notifier(&nb_inet6addr);
 721         unregister_inetaddr_notifier(&nb_inetaddr);
 722         unregister_netdevice_notifier(&nb_netdevice);
 723         /* Ensure all gid deletion tasks complete before we go down,
 724          * to avoid any reference to free'd memory. By the time
 725          * ib-core is removed, all physical devices have been removed,
 726          * so no issue with remaining hardware contexts.
 727          */
 728 }