1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright 2011-2014 Autronica Fire and Security AS 3 * 4 * Author(s): 5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se 6 * This file contains device methods for creating, using and destroying 7 * virtual HSR or PRP devices. 8 */ 9 10 #include <linux/netdevice.h> 11 #include <linux/skbuff.h> 12 #include <linux/etherdevice.h> 13 #include <linux/rtnetlink.h> 14 #include <linux/pkt_sched.h> 15 #include "hsr_device.h" 16 #include "hsr_slave.h" 17 #include "hsr_framereg.h" 18 #include "hsr_main.h" 19 #include "hsr_forward.h" 20 21 static bool is_admin_up(struct net_device *dev) 22 { 23 return dev && (dev->flags & IFF_UP); 24 } 25 26 static bool is_slave_up(struct net_device *dev) 27 { 28 return dev && is_admin_up(dev) && netif_oper_up(dev); 29 } 30 31 static void hsr_set_operstate(struct hsr_port *master, bool has_carrier) 32 { 33 struct net_device *dev = master->dev; 34 35 if (!is_admin_up(dev)) { 36 netdev_set_operstate(dev, IF_OPER_DOWN); 37 return; 38 } 39 40 if (has_carrier) 41 netdev_set_operstate(dev, IF_OPER_UP); 42 else 43 netdev_set_operstate(dev, IF_OPER_LOWERLAYERDOWN); 44 } 45 46 static bool hsr_check_carrier(struct hsr_port *master) 47 { 48 struct hsr_port *port; 49 50 ASSERT_RTNL(); 51 52 hsr_for_each_port(master->hsr, port) { 53 if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) { 54 netif_carrier_on(master->dev); 55 return true; 56 } 57 } 58 59 netif_carrier_off(master->dev); 60 61 return false; 62 } 63 64 static void hsr_check_announce(struct net_device *hsr_dev) 65 { 66 struct hsr_priv *hsr; 67 68 hsr = netdev_priv(hsr_dev); 69 if (netif_running(hsr_dev) && netif_oper_up(hsr_dev)) { 70 /* Enable announce timer and start sending supervisory frames */ 71 if (!timer_pending(&hsr->announce_timer)) { 72 hsr->announce_count = 0; 73 mod_timer(&hsr->announce_timer, jiffies + 74 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL)); 75 } 76 77 if (hsr->redbox && !timer_pending(&hsr->announce_proxy_timer)) 78 mod_timer(&hsr->announce_proxy_timer, jiffies + 79 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL) / 2); 80 } else { 81 /* Deactivate the announce timer */ 82 timer_delete(&hsr->announce_timer); 83 if (hsr->redbox) 84 timer_delete(&hsr->announce_proxy_timer); 85 } 86 } 87 88 void hsr_check_carrier_and_operstate(struct hsr_priv *hsr) 89 { 90 struct hsr_port *master; 91 bool has_carrier; 92 93 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 94 /* netif_stacked_transfer_operstate() cannot be used here since 95 * it doesn't set IF_OPER_LOWERLAYERDOWN (?) 96 */ 97 has_carrier = hsr_check_carrier(master); 98 hsr_set_operstate(master, has_carrier); 99 hsr_check_announce(master->dev); 100 } 101 102 int hsr_get_max_mtu(struct hsr_priv *hsr) 103 { 104 unsigned int mtu_max; 105 struct hsr_port *port; 106 107 mtu_max = ETH_DATA_LEN; 108 hsr_for_each_port(hsr, port) 109 if (port->type != HSR_PT_MASTER) 110 mtu_max = min(port->dev->mtu, mtu_max); 111 112 if (mtu_max < HSR_HLEN) 113 return 0; 114 return mtu_max - HSR_HLEN; 115 } 116 117 static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu) 118 { 119 struct hsr_priv *hsr; 120 121 hsr = netdev_priv(dev); 122 123 if (new_mtu > hsr_get_max_mtu(hsr)) { 124 netdev_info(dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n", 125 HSR_HLEN); 126 return -EINVAL; 127 } 128 129 WRITE_ONCE(dev->mtu, new_mtu); 130 131 return 0; 132 } 133 134 static int hsr_dev_open(struct net_device *dev) 135 { 136 struct hsr_priv *hsr; 137 struct hsr_port *port; 138 const char *designation = NULL; 139 140 hsr = netdev_priv(dev); 141 142 hsr_for_each_port(hsr, port) { 143 if (port->type == HSR_PT_MASTER) 144 continue; 145 switch (port->type) { 146 case HSR_PT_SLAVE_A: 147 designation = "Slave A"; 148 break; 149 case HSR_PT_SLAVE_B: 150 designation = "Slave B"; 151 break; 152 case HSR_PT_INTERLINK: 153 designation = "Interlink"; 154 break; 155 default: 156 designation = "Unknown"; 157 } 158 if (!is_slave_up(port->dev)) 159 netdev_warn(dev, "%s (%s) is not up; please bring it up to get a fully working HSR network\n", 160 designation, port->dev->name); 161 } 162 163 if (!designation) 164 netdev_warn(dev, "No slave devices configured\n"); 165 166 return 0; 167 } 168 169 static int hsr_dev_close(struct net_device *dev) 170 { 171 struct hsr_port *port; 172 struct hsr_priv *hsr; 173 174 hsr = netdev_priv(dev); 175 hsr_for_each_port(hsr, port) { 176 if (port->type == HSR_PT_MASTER) 177 continue; 178 switch (port->type) { 179 case HSR_PT_SLAVE_A: 180 case HSR_PT_SLAVE_B: 181 dev_uc_unsync(port->dev, dev); 182 dev_mc_unsync(port->dev, dev); 183 break; 184 default: 185 break; 186 } 187 } 188 189 return 0; 190 } 191 192 static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr, 193 netdev_features_t features) 194 { 195 netdev_features_t mask; 196 struct hsr_port *port; 197 198 mask = features; 199 200 /* Mask out all features that, if supported by one device, should be 201 * enabled for all devices (see NETIF_F_ONE_FOR_ALL). 202 * 203 * Anything that's off in mask will not be enabled - so only things 204 * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL, 205 * may become enabled. 206 */ 207 features &= ~NETIF_F_ONE_FOR_ALL; 208 hsr_for_each_port(hsr, port) 209 features = netdev_increment_features(features, 210 port->dev->features, 211 mask); 212 213 return features; 214 } 215 216 static netdev_features_t hsr_fix_features(struct net_device *dev, 217 netdev_features_t features) 218 { 219 struct hsr_priv *hsr = netdev_priv(dev); 220 221 return hsr_features_recompute(hsr, features); 222 } 223 224 static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) 225 { 226 struct hsr_priv *hsr = netdev_priv(dev); 227 struct hsr_port *master; 228 229 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 230 if (master) { 231 skb->dev = master->dev; 232 skb_reset_mac_header(skb); 233 skb_reset_mac_len(skb); 234 hsr_forward_skb(skb, master); 235 } else { 236 dev_core_stats_tx_dropped_inc(dev); 237 dev_kfree_skb_any(skb); 238 } 239 return NETDEV_TX_OK; 240 } 241 242 static const struct header_ops hsr_header_ops = { 243 .create = eth_header, 244 .parse = eth_header_parse, 245 }; 246 247 static struct sk_buff *hsr_init_skb(struct hsr_port *master) 248 { 249 struct hsr_priv *hsr = master->hsr; 250 struct sk_buff *skb; 251 int hlen, tlen; 252 253 hlen = LL_RESERVED_SPACE(master->dev); 254 tlen = master->dev->needed_tailroom; 255 /* skb size is same for PRP/HSR frames, only difference 256 * being, for PRP it is a trailer and for HSR it is a 257 * header 258 */ 259 skb = dev_alloc_skb(sizeof(struct hsr_sup_tag) + 260 sizeof(struct hsr_sup_payload) + hlen + tlen); 261 262 if (!skb) 263 return skb; 264 265 skb_reserve(skb, hlen); 266 skb->dev = master->dev; 267 skb->priority = TC_PRIO_CONTROL; 268 269 if (dev_hard_header(skb, skb->dev, ETH_P_PRP, 270 hsr->sup_multicast_addr, 271 skb->dev->dev_addr, skb->len) <= 0) 272 goto out; 273 274 skb_reset_mac_header(skb); 275 skb_reset_mac_len(skb); 276 skb_reset_network_header(skb); 277 skb_reset_transport_header(skb); 278 279 return skb; 280 out: 281 kfree_skb(skb); 282 283 return NULL; 284 } 285 286 static void send_hsr_supervision_frame(struct hsr_port *port, 287 unsigned long *interval, 288 const unsigned char *addr) 289 { 290 struct hsr_priv *hsr = port->hsr; 291 __u8 type = HSR_TLV_LIFE_CHECK; 292 struct hsr_sup_payload *hsr_sp; 293 struct hsr_sup_tlv *hsr_stlv; 294 struct hsr_sup_tag *hsr_stag; 295 struct sk_buff *skb; 296 297 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); 298 if (hsr->announce_count < 3 && hsr->prot_version == 0) { 299 type = HSR_TLV_ANNOUNCE; 300 *interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); 301 hsr->announce_count++; 302 } 303 304 skb = hsr_init_skb(port); 305 if (!skb) { 306 netdev_warn_once(port->dev, "HSR: Could not send supervision frame\n"); 307 return; 308 } 309 310 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); 311 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); 312 set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version); 313 314 /* From HSRv1 on we have separate supervision sequence numbers. */ 315 if (hsr->prot_version > 0) 316 hsr_stag->sequence_nr = htons(atomic_inc_return(&hsr->sup_sequence_nr)); 317 else 318 hsr_stag->sequence_nr = htons(atomic_inc_return(&hsr->sequence_nr)); 319 320 hsr_stag->tlv.HSR_TLV_type = type; 321 /* TODO: Why 12 in HSRv0? */ 322 hsr_stag->tlv.HSR_TLV_length = hsr->prot_version ? 323 sizeof(struct hsr_sup_payload) : 12; 324 325 /* Payload: MacAddressA / SAN MAC from ProxyNodeTable */ 326 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); 327 ether_addr_copy(hsr_sp->macaddress_A, addr); 328 329 if (hsr->redbox && 330 hsr_is_node_in_db(&hsr->proxy_node_db, addr)) { 331 hsr_stlv = skb_put(skb, sizeof(struct hsr_sup_tlv)); 332 hsr_stlv->HSR_TLV_type = PRP_TLV_REDBOX_MAC; 333 hsr_stlv->HSR_TLV_length = sizeof(struct hsr_sup_payload); 334 335 /* Payload: MacAddressRedBox */ 336 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); 337 ether_addr_copy(hsr_sp->macaddress_A, hsr->macaddress_redbox); 338 } 339 340 if (skb_put_padto(skb, ETH_ZLEN)) 341 return; 342 343 hsr_forward_skb(skb, port); 344 345 return; 346 } 347 348 static void send_prp_supervision_frame(struct hsr_port *master, 349 unsigned long *interval, 350 const unsigned char *addr) 351 { 352 struct hsr_priv *hsr = master->hsr; 353 struct hsr_sup_payload *hsr_sp; 354 struct hsr_sup_tag *hsr_stag; 355 struct sk_buff *skb; 356 357 skb = hsr_init_skb(master); 358 if (!skb) { 359 netdev_warn_once(master->dev, "PRP: Could not send supervision frame\n"); 360 return; 361 } 362 363 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); 364 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); 365 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); 366 set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0)); 367 368 /* From HSRv1 on we have separate supervision sequence numbers. */ 369 hsr_stag->sequence_nr = htons(atomic_inc_return(&hsr->sup_sequence_nr)); 370 hsr_stag->tlv.HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD; 371 hsr_stag->tlv.HSR_TLV_length = sizeof(struct hsr_sup_payload); 372 373 /* Payload: MacAddressA */ 374 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); 375 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); 376 377 if (skb_put_padto(skb, ETH_ZLEN)) 378 return; 379 380 hsr_forward_skb(skb, master); 381 } 382 383 /* Announce (supervision frame) timer function 384 */ 385 static void hsr_announce(struct timer_list *t) 386 { 387 struct hsr_priv *hsr; 388 struct hsr_port *master; 389 unsigned long interval; 390 391 hsr = from_timer(hsr, t, announce_timer); 392 393 rcu_read_lock(); 394 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 395 hsr->proto_ops->send_sv_frame(master, &interval, master->dev->dev_addr); 396 397 if (is_admin_up(master->dev)) 398 mod_timer(&hsr->announce_timer, jiffies + interval); 399 400 rcu_read_unlock(); 401 } 402 403 /* Announce (supervision frame) timer function for RedBox 404 */ 405 static void hsr_proxy_announce(struct timer_list *t) 406 { 407 struct hsr_priv *hsr = from_timer(hsr, t, announce_proxy_timer); 408 struct hsr_port *interlink; 409 unsigned long interval = 0; 410 struct hsr_node *node; 411 412 rcu_read_lock(); 413 /* RedBOX sends supervisory frames to HSR network with MAC addresses 414 * of SAN nodes stored in ProxyNodeTable. 415 */ 416 interlink = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK); 417 if (!interlink) 418 goto done; 419 420 list_for_each_entry_rcu(node, &hsr->proxy_node_db, mac_list) { 421 if (hsr_addr_is_redbox(hsr, node->macaddress_A)) 422 continue; 423 hsr->proto_ops->send_sv_frame(interlink, &interval, 424 node->macaddress_A); 425 } 426 427 if (is_admin_up(interlink->dev)) { 428 if (!interval) 429 interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); 430 431 mod_timer(&hsr->announce_proxy_timer, jiffies + interval); 432 } 433 434 done: 435 rcu_read_unlock(); 436 } 437 438 void hsr_del_ports(struct hsr_priv *hsr) 439 { 440 struct hsr_port *port; 441 442 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); 443 if (port) 444 hsr_del_port(port); 445 446 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); 447 if (port) 448 hsr_del_port(port); 449 450 port = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK); 451 if (port) 452 hsr_del_port(port); 453 454 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 455 if (port) 456 hsr_del_port(port); 457 } 458 459 static void hsr_set_rx_mode(struct net_device *dev) 460 { 461 struct hsr_port *port; 462 struct hsr_priv *hsr; 463 464 hsr = netdev_priv(dev); 465 466 hsr_for_each_port(hsr, port) { 467 if (port->type == HSR_PT_MASTER) 468 continue; 469 switch (port->type) { 470 case HSR_PT_SLAVE_A: 471 case HSR_PT_SLAVE_B: 472 dev_mc_sync_multiple(port->dev, dev); 473 dev_uc_sync_multiple(port->dev, dev); 474 break; 475 default: 476 break; 477 } 478 } 479 } 480 481 static void hsr_change_rx_flags(struct net_device *dev, int change) 482 { 483 struct hsr_port *port; 484 struct hsr_priv *hsr; 485 486 hsr = netdev_priv(dev); 487 488 hsr_for_each_port(hsr, port) { 489 if (port->type == HSR_PT_MASTER) 490 continue; 491 switch (port->type) { 492 case HSR_PT_SLAVE_A: 493 case HSR_PT_SLAVE_B: 494 if (change & IFF_ALLMULTI) 495 dev_set_allmulti(port->dev, 496 dev->flags & 497 IFF_ALLMULTI ? 1 : -1); 498 break; 499 default: 500 break; 501 } 502 } 503 } 504 505 static const struct net_device_ops hsr_device_ops = { 506 .ndo_change_mtu = hsr_dev_change_mtu, 507 .ndo_open = hsr_dev_open, 508 .ndo_stop = hsr_dev_close, 509 .ndo_start_xmit = hsr_dev_xmit, 510 .ndo_change_rx_flags = hsr_change_rx_flags, 511 .ndo_fix_features = hsr_fix_features, 512 .ndo_set_rx_mode = hsr_set_rx_mode, 513 }; 514 515 static const struct device_type hsr_type = { 516 .name = "hsr", 517 }; 518 519 static struct hsr_proto_ops hsr_ops = { 520 .send_sv_frame = send_hsr_supervision_frame, 521 .create_tagged_frame = hsr_create_tagged_frame, 522 .get_untagged_frame = hsr_get_untagged_frame, 523 .drop_frame = hsr_drop_frame, 524 .fill_frame_info = hsr_fill_frame_info, 525 .invalid_dan_ingress_frame = hsr_invalid_dan_ingress_frame, 526 }; 527 528 static struct hsr_proto_ops prp_ops = { 529 .send_sv_frame = send_prp_supervision_frame, 530 .create_tagged_frame = prp_create_tagged_frame, 531 .get_untagged_frame = prp_get_untagged_frame, 532 .drop_frame = prp_drop_frame, 533 .fill_frame_info = prp_fill_frame_info, 534 .handle_san_frame = prp_handle_san_frame, 535 .update_san_info = prp_update_san_info, 536 }; 537 538 void hsr_dev_setup(struct net_device *dev) 539 { 540 eth_hw_addr_random(dev); 541 542 ether_setup(dev); 543 dev->min_mtu = 0; 544 dev->header_ops = &hsr_header_ops; 545 dev->netdev_ops = &hsr_device_ops; 546 SET_NETDEV_DEVTYPE(dev, &hsr_type); 547 dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL; 548 549 dev->needs_free_netdev = true; 550 551 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | 552 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | 553 NETIF_F_HW_VLAN_CTAG_TX; 554 555 dev->features = dev->hw_features; 556 557 /* Prevent recursive tx locking */ 558 dev->features |= NETIF_F_LLTX; 559 /* VLAN on top of HSR needs testing and probably some work on 560 * hsr_header_create() etc. 561 */ 562 dev->features |= NETIF_F_VLAN_CHALLENGED; 563 /* Not sure about this. Taken from bridge code. netdev_features.h says 564 * it means "Does not change network namespaces". 565 */ 566 dev->features |= NETIF_F_NETNS_LOCAL; 567 } 568 569 /* Return true if dev is a HSR master; return false otherwise. 570 */ 571 bool is_hsr_master(struct net_device *dev) 572 { 573 return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit); 574 } 575 EXPORT_SYMBOL(is_hsr_master); 576 577 /* Default multicast address for HSR Supervision frames */ 578 static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = { 579 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00 580 }; 581 582 int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2], 583 struct net_device *interlink, unsigned char multicast_spec, 584 u8 protocol_version, struct netlink_ext_ack *extack) 585 { 586 bool unregister = false; 587 struct hsr_priv *hsr; 588 int res; 589 590 hsr = netdev_priv(hsr_dev); 591 INIT_LIST_HEAD(&hsr->ports); 592 INIT_LIST_HEAD(&hsr->node_db); 593 INIT_LIST_HEAD(&hsr->proxy_node_db); 594 spin_lock_init(&hsr->list_lock); 595 596 eth_hw_addr_set(hsr_dev, slave[0]->dev_addr); 597 598 /* initialize protocol specific functions */ 599 if (protocol_version == PRP_V1) { 600 /* For PRP, lan_id has most significant 3 bits holding 601 * the net_id of PRP_LAN_ID 602 */ 603 hsr->net_id = PRP_LAN_ID << 1; 604 hsr->proto_ops = &prp_ops; 605 } else { 606 hsr->proto_ops = &hsr_ops; 607 } 608 609 /* Make sure we recognize frames from ourselves in hsr_rcv() */ 610 res = hsr_create_self_node(hsr, hsr_dev->dev_addr, 611 slave[1]->dev_addr); 612 if (res < 0) 613 return res; 614 615 /* Overflow soon to find bugs easier: */ 616 atomic_set(&hsr->sequence_nr, HSR_SEQNR_START); 617 atomic_set(&hsr->sup_sequence_nr, HSR_SUP_SEQNR_START); 618 619 timer_setup(&hsr->announce_timer, hsr_announce, 0); 620 timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0); 621 timer_setup(&hsr->prune_proxy_timer, hsr_prune_proxy_nodes, 0); 622 timer_setup(&hsr->announce_proxy_timer, hsr_proxy_announce, 0); 623 624 ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr); 625 hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; 626 627 hsr->prot_version = protocol_version; 628 629 /* Make sure the 1st call to netif_carrier_on() gets through */ 630 netif_carrier_off(hsr_dev); 631 632 res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER, extack); 633 if (res) 634 goto err_add_master; 635 636 /* HSR forwarding offload supported in lower device? */ 637 if ((slave[0]->features & NETIF_F_HW_HSR_FWD) && 638 (slave[1]->features & NETIF_F_HW_HSR_FWD)) 639 hsr->fwd_offloaded = true; 640 641 res = register_netdevice(hsr_dev); 642 if (res) 643 goto err_unregister; 644 645 unregister = true; 646 647 res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack); 648 if (res) 649 goto err_unregister; 650 651 res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B, extack); 652 if (res) 653 goto err_unregister; 654 655 if (interlink) { 656 res = hsr_add_port(hsr, interlink, HSR_PT_INTERLINK, extack); 657 if (res) 658 goto err_unregister; 659 660 hsr->redbox = true; 661 ether_addr_copy(hsr->macaddress_redbox, interlink->dev_addr); 662 mod_timer(&hsr->prune_proxy_timer, 663 jiffies + msecs_to_jiffies(PRUNE_PROXY_PERIOD)); 664 } 665 666 hsr_debugfs_init(hsr, hsr_dev); 667 mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD)); 668 669 return 0; 670 671 err_unregister: 672 hsr_del_ports(hsr); 673 err_add_master: 674 hsr_del_self_node(hsr); 675 676 if (unregister) 677 unregister_netdevice(hsr_dev); 678 return res; 679 } 680