net/switchdev/switchdev.c

   1 /*
   2  * net/switchdev/switchdev.c - Switch device API
   3  * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
   4  * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/init.h>
  15 #include <linux/mutex.h>
  16 #include <linux/notifier.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/if_bridge.h>
  19 #include <net/ip_fib.h>
  20 #include <net/switchdev.h>
  21
  22 /**
  23  *      switchdev_port_attr_get - Get port attribute
  24  *
  25  *      @dev: port device
  26  *      @attr: attribute to get
  27  */
  28 int switchdev_port_attr_get(struct net_device *dev, struct switchdev_attr *attr)
  29 {
  30         const struct switchdev_ops *ops = dev->switchdev_ops;
  31         struct net_device *lower_dev;
  32         struct list_head *iter;
  33         struct switchdev_attr first = {
  34                 .id = SWITCHDEV_ATTR_UNDEFINED
  35         };
  36         int err = -EOPNOTSUPP;
  37
  38         if (ops && ops->switchdev_port_attr_get)
  39                 return ops->switchdev_port_attr_get(dev, attr);
  40
  41         if (attr->flags & SWITCHDEV_F_NO_RECURSE)
  42                 return err;
  43
  44         /* Switch device port(s) may be stacked under
  45          * bond/team/vlan dev, so recurse down to get attr on
  46          * each port.  Return -ENODATA if attr values don't
  47          * compare across ports.
  48          */
  49
  50         netdev_for_each_lower_dev(dev, lower_dev, iter) {
  51                 err = switchdev_port_attr_get(lower_dev, attr);
  52                 if (err)
  53                         break;
  54                 if (first.id == SWITCHDEV_ATTR_UNDEFINED)
  55                         first = *attr;
  56                 else if (memcmp(&first, attr, sizeof(*attr)))
  57                         return -ENODATA;
  58         }
  59
  60         return err;
  61 }
  62 EXPORT_SYMBOL_GPL(switchdev_port_attr_get);
  63
  64 static int __switchdev_port_attr_set(struct net_device *dev,
  65                                      struct switchdev_attr *attr)
  66 {
  67         const struct switchdev_ops *ops = dev->switchdev_ops;
  68         struct net_device *lower_dev;
  69         struct list_head *iter;
  70         int err = -EOPNOTSUPP;
  71
  72         if (ops && ops->switchdev_port_attr_set)
  73                 return ops->switchdev_port_attr_set(dev, attr);
  74
  75         if (attr->flags & SWITCHDEV_F_NO_RECURSE)
  76                 return err;
  77
  78         /* Switch device port(s) may be stacked under
  79          * bond/team/vlan dev, so recurse down to set attr on
  80          * each port.
  81          */
  82
  83         netdev_for_each_lower_dev(dev, lower_dev, iter) {
  84                 err = __switchdev_port_attr_set(lower_dev, attr);
  85                 if (err)
  86                         break;
  87         }
  88
  89         return err;
  90 }
  91
  92 struct switchdev_attr_set_work {
  93         struct work_struct work;
  94         struct net_device *dev;
  95         struct switchdev_attr attr;
  96 };
  97
  98 static void switchdev_port_attr_set_work(struct work_struct *work)
  99 {
 100         struct switchdev_attr_set_work *asw =
 101                 container_of(work, struct switchdev_attr_set_work, work);
 102         int err;
 103
 104         rtnl_lock();
 105         err = switchdev_port_attr_set(asw->dev, &asw->attr);
 106         BUG_ON(err);
 107         rtnl_unlock();
 108
 109         dev_put(asw->dev);
 110         kfree(work);
 111 }
 112
 113 static int switchdev_port_attr_set_defer(struct net_device *dev,
 114                                          struct switchdev_attr *attr)
 115 {
 116         struct switchdev_attr_set_work *asw;
 117
 118         asw = kmalloc(sizeof(*asw), GFP_ATOMIC);
 119         if (!asw)
 120                 return -ENOMEM;
 121
 122         INIT_WORK(&asw->work, switchdev_port_attr_set_work);
 123
 124         dev_hold(dev);
 125         asw->dev = dev;
 126         memcpy(&asw->attr, attr, sizeof(asw->attr));
 127
 128         schedule_work(&asw->work);
 129
 130         return 0;
 131 }
 132
 133 /**
 134  *      switchdev_port_attr_set - Set port attribute
 135  *
 136  *      @dev: port device
 137  *      @attr: attribute to set
 138  *
 139  *      Use a 2-phase prepare-commit transaction model to ensure
 140  *      system is not left in a partially updated state due to
 141  *      failure from driver/device.
 142  */
 143 int switchdev_port_attr_set(struct net_device *dev, struct switchdev_attr *attr)
 144 {
 145         int err;
 146
 147         if (!rtnl_is_locked()) {
 148                 /* Running prepare-commit transaction across stacked
 149                  * devices requires nothing moves, so if rtnl_lock is
 150                  * not held, schedule a worker thread to hold rtnl_lock
 151                  * while setting attr.
 152                  */
 153
 154                 return switchdev_port_attr_set_defer(dev, attr);
 155         }
 156
 157         /* Phase I: prepare for attr set. Driver/device should fail
 158          * here if there are going to be issues in the commit phase,
 159          * such as lack of resources or support.  The driver/device
 160          * should reserve resources needed for the commit phase here,
 161          * but should not commit the attr.
 162          */
 163
 164         attr->trans = SWITCHDEV_TRANS_PREPARE;
 165         err = __switchdev_port_attr_set(dev, attr);
 166         if (err) {
 167                 /* Prepare phase failed: abort the transaction.  Any
 168                  * resources reserved in the prepare phase are
 169                  * released.
 170                  */
 171
 172                 attr->trans = SWITCHDEV_TRANS_ABORT;
 173                 __switchdev_port_attr_set(dev, attr);
 174
 175                 return err;
 176         }
 177
 178         /* Phase II: commit attr set.  This cannot fail as a fault
 179          * of driver/device.  If it does, it's a bug in the driver/device
 180          * because the driver said everythings was OK in phase I.
 181          */
 182
 183         attr->trans = SWITCHDEV_TRANS_COMMIT;
 184         err = __switchdev_port_attr_set(dev, attr);
 185         BUG_ON(err);
 186
 187         return err;
 188 }
 189 EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
 190
 191 int __switchdev_port_obj_add(struct net_device *dev, struct switchdev_obj *obj)
 192 {
 193         const struct switchdev_ops *ops = dev->switchdev_ops;
 194         struct net_device *lower_dev;
 195         struct list_head *iter;
 196         int err = -EOPNOTSUPP;
 197
 198         if (ops && ops->switchdev_port_obj_add)
 199                 return ops->switchdev_port_obj_add(dev, obj);
 200
 201         /* Switch device port(s) may be stacked under
 202          * bond/team/vlan dev, so recurse down to add object on
 203          * each port.
 204          */
 205
 206         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 207                 err = __switchdev_port_obj_add(lower_dev, obj);
 208                 if (err)
 209                         break;
 210         }
 211
 212         return err;
 213 }
 214
 215 /**
 216  *      switchdev_port_obj_add - Add port object
 217  *
 218  *      @dev: port device
 219  *      @obj: object to add
 220  *
 221  *      Use a 2-phase prepare-commit transaction model to ensure
 222  *      system is not left in a partially updated state due to
 223  *      failure from driver/device.
 224  *
 225  *      rtnl_lock must be held.
 226  */
 227 int switchdev_port_obj_add(struct net_device *dev, struct switchdev_obj *obj)
 228 {
 229         int err;
 230
 231         ASSERT_RTNL();
 232
 233         /* Phase I: prepare for obj add. Driver/device should fail
 234          * here if there are going to be issues in the commit phase,
 235          * such as lack of resources or support.  The driver/device
 236          * should reserve resources needed for the commit phase here,
 237          * but should not commit the obj.
 238          */
 239
 240         obj->trans = SWITCHDEV_TRANS_PREPARE;
 241         err = __switchdev_port_obj_add(dev, obj);
 242         if (err) {
 243                 /* Prepare phase failed: abort the transaction.  Any
 244                  * resources reserved in the prepare phase are
 245                  * released.
 246                  */
 247
 248                 obj->trans = SWITCHDEV_TRANS_ABORT;
 249                 __switchdev_port_obj_add(dev, obj);
 250
 251                 return err;
 252         }
 253
 254         /* Phase II: commit obj add.  This cannot fail as a fault
 255          * of driver/device.  If it does, it's a bug in the driver/device
 256          * because the driver said everythings was OK in phase I.
 257          */
 258
 259         obj->trans = SWITCHDEV_TRANS_COMMIT;
 260         err = __switchdev_port_obj_add(dev, obj);
 261         WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
 262
 263         return err;
 264 }
 265 EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
 266
 267 /**
 268  *      switchdev_port_obj_del - Delete port object
 269  *
 270  *      @dev: port device
 271  *      @obj: object to delete
 272  */
 273 int switchdev_port_obj_del(struct net_device *dev, struct switchdev_obj *obj)
 274 {
 275         const struct switchdev_ops *ops = dev->switchdev_ops;
 276         struct net_device *lower_dev;
 277         struct list_head *iter;
 278         int err = -EOPNOTSUPP;
 279
 280         if (ops && ops->switchdev_port_obj_del)
 281                 return ops->switchdev_port_obj_del(dev, obj);
 282
 283         /* Switch device port(s) may be stacked under
 284          * bond/team/vlan dev, so recurse down to delete object on
 285          * each port.
 286          */
 287
 288         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 289                 err = switchdev_port_obj_del(lower_dev, obj);
 290                 if (err)
 291                         break;
 292         }
 293
 294         return err;
 295 }
 296 EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
 297
 298 static DEFINE_MUTEX(switchdev_mutex);
 299 static RAW_NOTIFIER_HEAD(switchdev_notif_chain);
 300
 301 /**
 302  *      register_switchdev_notifier - Register notifier
 303  *      @nb: notifier_block
 304  *
 305  *      Register switch device notifier. This should be used by code
 306  *      which needs to monitor events happening in particular device.
 307  *      Return values are same as for atomic_notifier_chain_register().
 308  */
 309 int register_switchdev_notifier(struct notifier_block *nb)
 310 {
 311         int err;
 312
 313         mutex_lock(&switchdev_mutex);
 314         err = raw_notifier_chain_register(&switchdev_notif_chain, nb);
 315         mutex_unlock(&switchdev_mutex);
 316         return err;
 317 }
 318 EXPORT_SYMBOL_GPL(register_switchdev_notifier);
 319
 320 /**
 321  *      unregister_switchdev_notifier - Unregister notifier
 322  *      @nb: notifier_block
 323  *
 324  *      Unregister switch device notifier.
 325  *      Return values are same as for atomic_notifier_chain_unregister().
 326  */
 327 int unregister_switchdev_notifier(struct notifier_block *nb)
 328 {
 329         int err;
 330
 331         mutex_lock(&switchdev_mutex);
 332         err = raw_notifier_chain_unregister(&switchdev_notif_chain, nb);
 333         mutex_unlock(&switchdev_mutex);
 334         return err;
 335 }
 336 EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
 337
 338 /**
 339  *      call_switchdev_notifiers - Call notifiers
 340  *      @val: value passed unmodified to notifier function
 341  *      @dev: port device
 342  *      @info: notifier information data
 343  *
 344  *      Call all network notifier blocks. This should be called by driver
 345  *      when it needs to propagate hardware event.
 346  *      Return values are same as for atomic_notifier_call_chain().
 347  */
 348 int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
 349                              struct switchdev_notifier_info *info)
 350 {
 351         int err;
 352
 353         info->dev = dev;
 354         mutex_lock(&switchdev_mutex);
 355         err = raw_notifier_call_chain(&switchdev_notif_chain, val, info);
 356         mutex_unlock(&switchdev_mutex);
 357         return err;
 358 }
 359 EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
 360
 361 /**
 362  *      switchdev_port_bridge_getlink - Get bridge port attributes
 363  *
 364  *      @dev: port device
 365  *
 366  *      Called for SELF on rtnl_bridge_getlink to get bridge port
 367  *      attributes.
 368  */
 369 int switchdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 370                                   struct net_device *dev, u32 filter_mask,
 371                                   int nlflags)
 372 {
 373         struct switchdev_attr attr = {
 374                 .id = SWITCHDEV_ATTR_PORT_BRIDGE_FLAGS,
 375         };
 376         u16 mode = BRIDGE_MODE_UNDEF;
 377         u32 mask = BR_LEARNING | BR_LEARNING_SYNC;
 378         int err;
 379
 380         err = switchdev_port_attr_get(dev, &attr);
 381         if (err)
 382                 return err;
 383
 384         return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
 385                                        attr.brport_flags, mask, nlflags);
 386 }
 387 EXPORT_SYMBOL_GPL(switchdev_port_bridge_getlink);
 388
 389 static int switchdev_port_br_setflag(struct net_device *dev,
 390                                      struct nlattr *nlattr,
 391                                      unsigned long brport_flag)
 392 {
 393         struct switchdev_attr attr = {
 394                 .id = SWITCHDEV_ATTR_PORT_BRIDGE_FLAGS,
 395         };
 396         u8 flag = nla_get_u8(nlattr);
 397         int err;
 398
 399         err = switchdev_port_attr_get(dev, &attr);
 400         if (err)
 401                 return err;
 402
 403         if (flag)
 404                 attr.brport_flags |= brport_flag;
 405         else
 406                 attr.brport_flags &= ~brport_flag;
 407
 408         return switchdev_port_attr_set(dev, &attr);
 409 }
 410
 411 static const struct nla_policy
 412 switchdev_port_bridge_policy[IFLA_BRPORT_MAX + 1] = {
 413         [IFLA_BRPORT_STATE]             = { .type = NLA_U8 },
 414         [IFLA_BRPORT_COST]              = { .type = NLA_U32 },
 415         [IFLA_BRPORT_PRIORITY]          = { .type = NLA_U16 },
 416         [IFLA_BRPORT_MODE]              = { .type = NLA_U8 },
 417         [IFLA_BRPORT_GUARD]             = { .type = NLA_U8 },
 418         [IFLA_BRPORT_PROTECT]           = { .type = NLA_U8 },
 419         [IFLA_BRPORT_FAST_LEAVE]        = { .type = NLA_U8 },
 420         [IFLA_BRPORT_LEARNING]          = { .type = NLA_U8 },
 421         [IFLA_BRPORT_LEARNING_SYNC]     = { .type = NLA_U8 },
 422         [IFLA_BRPORT_UNICAST_FLOOD]     = { .type = NLA_U8 },
 423 };
 424
 425 static int switchdev_port_br_setlink_protinfo(struct net_device *dev,
 426                                               struct nlattr *protinfo)
 427 {
 428         struct nlattr *attr;
 429         int rem;
 430         int err;
 431
 432         err = nla_validate_nested(protinfo, IFLA_BRPORT_MAX,
 433                                   switchdev_port_bridge_policy);
 434         if (err)
 435                 return err;
 436
 437         nla_for_each_nested(attr, protinfo, rem) {
 438                 switch (nla_type(attr)) {
 439                 case IFLA_BRPORT_LEARNING:
 440                         err = switchdev_port_br_setflag(dev, attr,
 441                                                         BR_LEARNING);
 442                         break;
 443                 case IFLA_BRPORT_LEARNING_SYNC:
 444                         err = switchdev_port_br_setflag(dev, attr,
 445                                                         BR_LEARNING_SYNC);
 446                         break;
 447                 default:
 448                         err = -EOPNOTSUPP;
 449                         break;
 450                 }
 451                 if (err)
 452                         return err;
 453         }
 454
 455         return 0;
 456 }
 457
 458 static int switchdev_port_br_afspec(struct net_device *dev,
 459                                     struct nlattr *afspec,
 460                                     int (*f)(struct net_device *dev,
 461                                              struct switchdev_obj *obj))
 462 {
 463         struct nlattr *attr;
 464         struct bridge_vlan_info *vinfo;
 465         struct switchdev_obj obj = {
 466                 .id = SWITCHDEV_OBJ_PORT_VLAN,
 467         };
 468         int rem;
 469         int err;
 470
 471         nla_for_each_nested(attr, afspec, rem) {
 472                 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
 473                         continue;
 474                 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
 475                         return -EINVAL;
 476                 vinfo = nla_data(attr);
 477                 obj.vlan.flags = vinfo->flags;
 478                 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 479                         if (obj.vlan.vid_start)
 480                                 return -EINVAL;
 481                         obj.vlan.vid_start = vinfo->vid;
 482                 } else if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END) {
 483                         if (!obj.vlan.vid_start)
 484                                 return -EINVAL;
 485                         obj.vlan.vid_end = vinfo->vid;
 486                         if (obj.vlan.vid_end <= obj.vlan.vid_start)
 487                                 return -EINVAL;
 488                         err = f(dev, &obj);
 489                         if (err)
 490                                 return err;
 491                         memset(&obj.vlan, 0, sizeof(obj.vlan));
 492                 } else {
 493                         if (obj.vlan.vid_start)
 494                                 return -EINVAL;
 495                         obj.vlan.vid_start = vinfo->vid;
 496                         obj.vlan.vid_end = vinfo->vid;
 497                         err = f(dev, &obj);
 498                         if (err)
 499                                 return err;
 500                         memset(&obj.vlan, 0, sizeof(obj.vlan));
 501                 }
 502         }
 503
 504         return 0;
 505 }
 506
 507 /**
 508  *      switchdev_port_bridge_setlink - Set bridge port attributes
 509  *
 510  *      @dev: port device
 511  *      @nlh: netlink header
 512  *      @flags: netlink flags
 513  *
 514  *      Called for SELF on rtnl_bridge_setlink to set bridge port
 515  *      attributes.
 516  */
 517 int switchdev_port_bridge_setlink(struct net_device *dev,
 518                                   struct nlmsghdr *nlh, u16 flags)
 519 {
 520         struct nlattr *protinfo;
 521         struct nlattr *afspec;
 522         int err = 0;
 523
 524         protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 525                                    IFLA_PROTINFO);
 526         if (protinfo) {
 527                 err = switchdev_port_br_setlink_protinfo(dev, protinfo);
 528                 if (err)
 529                         return err;
 530         }
 531
 532         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 533                                  IFLA_AF_SPEC);
 534         if (afspec)
 535                 err = switchdev_port_br_afspec(dev, afspec,
 536                                                switchdev_port_obj_add);
 537
 538         return err;
 539 }
 540 EXPORT_SYMBOL_GPL(switchdev_port_bridge_setlink);
 541
 542 /**
 543  *      switchdev_port_bridge_dellink - Set bridge port attributes
 544  *
 545  *      @dev: port device
 546  *      @nlh: netlink header
 547  *      @flags: netlink flags
 548  *
 549  *      Called for SELF on rtnl_bridge_dellink to set bridge port
 550  *      attributes.
 551  */
 552 int switchdev_port_bridge_dellink(struct net_device *dev,
 553                                   struct nlmsghdr *nlh, u16 flags)
 554 {
 555         struct nlattr *afspec;
 556
 557         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 558                                  IFLA_AF_SPEC);
 559         if (afspec)
 560                 return switchdev_port_br_afspec(dev, afspec,
 561                                                 switchdev_port_obj_del);
 562
 563         return 0;
 564 }
 565 EXPORT_SYMBOL_GPL(switchdev_port_bridge_dellink);
 566
 567 static struct net_device *switchdev_get_lowest_dev(struct net_device *dev)
 568 {
 569         const struct switchdev_ops *ops = dev->switchdev_ops;
 570         struct net_device *lower_dev;
 571         struct net_device *port_dev;
 572         struct list_head *iter;
 573
 574         /* Recusively search down until we find a sw port dev.
 575          * (A sw port dev supports switchdev_port_attr_get).
 576          */
 577
 578         if (ops && ops->switchdev_port_attr_get)
 579                 return dev;
 580
 581         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 582                 port_dev = switchdev_get_lowest_dev(lower_dev);
 583                 if (port_dev)
 584                         return port_dev;
 585         }
 586
 587         return NULL;
 588 }
 589
 590 static struct net_device *switchdev_get_dev_by_nhs(struct fib_info *fi)
 591 {
 592         struct switchdev_attr attr = {
 593                 .id = SWITCHDEV_ATTR_PORT_PARENT_ID,
 594         };
 595         struct switchdev_attr prev_attr;
 596         struct net_device *dev = NULL;
 597         int nhsel;
 598
 599         /* For this route, all nexthop devs must be on the same switch. */
 600
 601         for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
 602                 const struct fib_nh *nh = &fi->fib_nh[nhsel];
 603
 604                 if (!nh->nh_dev)
 605                         return NULL;
 606
 607                 dev = switchdev_get_lowest_dev(nh->nh_dev);
 608                 if (!dev)
 609                         return NULL;
 610
 611                 if (switchdev_port_attr_get(dev, &attr))
 612                         return NULL;
 613
 614                 if (nhsel > 0) {
 615                         if (prev_attr.ppid.id_len != attr.ppid.id_len)
 616                                 return NULL;
 617                         if (memcmp(prev_attr.ppid.id, attr.ppid.id,
 618                                    attr.ppid.id_len))
 619                                 return NULL;
 620                 }
 621
 622                 prev_attr = attr;
 623         }
 624
 625         return dev;
 626 }
 627
 628 /**
 629  *      switchdev_fib_ipv4_add - Add IPv4 route entry to switch
 630  *
 631  *      @dst: route's IPv4 destination address
 632  *      @dst_len: destination address length (prefix length)
 633  *      @fi: route FIB info structure
 634  *      @tos: route TOS
 635  *      @type: route type
 636  *      @nlflags: netlink flags passed in (NLM_F_*)
 637  *      @tb_id: route table ID
 638  *
 639  *      Add IPv4 route entry to switch device.
 640  */
 641 int switchdev_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
 642                            u8 tos, u8 type, u32 nlflags, u32 tb_id)
 643 {
 644         struct net_device *dev;
 645         const struct switchdev_ops *ops;
 646         int err = 0;
 647
 648         /* Don't offload route if using custom ip rules or if
 649          * IPv4 FIB offloading has been disabled completely.
 650          */
 651
 652 #ifdef CONFIG_IP_MULTIPLE_TABLES
 653         if (fi->fib_net->ipv4.fib_has_custom_rules)
 654                 return 0;
 655 #endif
 656
 657         if (fi->fib_net->ipv4.fib_offload_disabled)
 658                 return 0;
 659
 660         dev = switchdev_get_dev_by_nhs(fi);
 661         if (!dev)
 662                 return 0;
 663         ops = dev->switchdev_ops;
 664
 665         if (ops->switchdev_fib_ipv4_add) {
 666                 err = ops->switchdev_fib_ipv4_add(dev, htonl(dst), dst_len,
 667                                                   fi, tos, type, nlflags,
 668                                                   tb_id);
 669                 if (!err)
 670                         fi->fib_flags |= RTNH_F_EXTERNAL;
 671         }
 672
 673         return err;
 674 }
 675 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_add);
 676
 677 /**
 678  *      switchdev_fib_ipv4_del - Delete IPv4 route entry from switch
 679  *
 680  *      @dst: route's IPv4 destination address
 681  *      @dst_len: destination address length (prefix length)
 682  *      @fi: route FIB info structure
 683  *      @tos: route TOS
 684  *      @type: route type
 685  *      @tb_id: route table ID
 686  *
 687  *      Delete IPv4 route entry from switch device.
 688  */
 689 int switchdev_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
 690                            u8 tos, u8 type, u32 tb_id)
 691 {
 692         struct net_device *dev;
 693         const struct switchdev_ops *ops;
 694         int err = 0;
 695
 696         if (!(fi->fib_flags & RTNH_F_EXTERNAL))
 697                 return 0;
 698
 699         dev = switchdev_get_dev_by_nhs(fi);
 700         if (!dev)
 701                 return 0;
 702         ops = dev->switchdev_ops;
 703
 704         if (ops->switchdev_fib_ipv4_del) {
 705                 err = ops->switchdev_fib_ipv4_del(dev, htonl(dst), dst_len,
 706                                                   fi, tos, type, tb_id);
 707                 if (!err)
 708                         fi->fib_flags &= ~RTNH_F_EXTERNAL;
 709         }
 710
 711         return err;
 712 }
 713 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_del);
 714
 715 /**
 716  *      switchdev_fib_ipv4_abort - Abort an IPv4 FIB operation
 717  *
 718  *      @fi: route FIB info structure
 719  */
 720 void switchdev_fib_ipv4_abort(struct fib_info *fi)
 721 {
 722         /* There was a problem installing this route to the offload
 723          * device.  For now, until we come up with more refined
 724          * policy handling, abruptly end IPv4 fib offloading for
 725          * for entire net by flushing offload device(s) of all
 726          * IPv4 routes, and mark IPv4 fib offloading broken from
 727          * this point forward.
 728          */
 729
 730         fib_flush_external(fi->fib_net);
 731         fi->fib_net->ipv4.fib_offload_disabled = true;
 732 }
 733 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_abort);