net/hsr/hsr_device.c

   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                 spin_lock_bh(&hsr->seqnr_lock);
 235                 hsr_forward_skb(skb, master);
 236                 spin_unlock_bh(&hsr->seqnr_lock);
 237         } else {
 238                 dev_core_stats_tx_dropped_inc(dev);
 239                 dev_kfree_skb_any(skb);
 240         }
 241         return NETDEV_TX_OK;
 242 }
 243
 244 static const struct header_ops hsr_header_ops = {
 245         .create  = eth_header,
 246         .parse   = eth_header_parse,
 247 };
 248
 249 static struct sk_buff *hsr_init_skb(struct hsr_port *master)
 250 {
 251         struct hsr_priv *hsr = master->hsr;
 252         struct sk_buff *skb;
 253         int hlen, tlen;
 254
 255         hlen = LL_RESERVED_SPACE(master->dev);
 256         tlen = master->dev->needed_tailroom;
 257         /* skb size is same for PRP/HSR frames, only difference
 258          * being, for PRP it is a trailer and for HSR it is a
 259          * header
 260          */
 261         skb = dev_alloc_skb(sizeof(struct hsr_sup_tag) +
 262                             sizeof(struct hsr_sup_payload) + hlen + tlen);
 263
 264         if (!skb)
 265                 return skb;
 266
 267         skb_reserve(skb, hlen);
 268         skb->dev = master->dev;
 269         skb->priority = TC_PRIO_CONTROL;
 270
 271         skb_reset_network_header(skb);
 272         skb_reset_transport_header(skb);
 273         if (dev_hard_header(skb, skb->dev, ETH_P_PRP,
 274                             hsr->sup_multicast_addr,
 275                             skb->dev->dev_addr, skb->len) <= 0)
 276                 goto out;
 277
 278         skb_reset_mac_header(skb);
 279         skb_reset_mac_len(skb);
 280
 281         return skb;
 282 out:
 283         kfree_skb(skb);
 284
 285         return NULL;
 286 }
 287
 288 static void send_hsr_supervision_frame(struct hsr_port *port,
 289                                        unsigned long *interval,
 290                                        const unsigned char *addr)
 291 {
 292         struct hsr_priv *hsr = port->hsr;
 293         __u8 type = HSR_TLV_LIFE_CHECK;
 294         struct hsr_sup_payload *hsr_sp;
 295         struct hsr_sup_tlv *hsr_stlv;
 296         struct hsr_sup_tag *hsr_stag;
 297         struct sk_buff *skb;
 298
 299         *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
 300         if (hsr->announce_count < 3 && hsr->prot_version == 0) {
 301                 type = HSR_TLV_ANNOUNCE;
 302                 *interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
 303                 hsr->announce_count++;
 304         }
 305
 306         skb = hsr_init_skb(port);
 307         if (!skb) {
 308                 netdev_warn_once(port->dev, "HSR: Could not send supervision frame\n");
 309                 return;
 310         }
 311
 312         hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
 313         set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf));
 314         set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version);
 315
 316         /* From HSRv1 on we have separate supervision sequence numbers. */
 317         spin_lock_bh(&hsr->seqnr_lock);
 318         if (hsr->prot_version > 0) {
 319                 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr);
 320                 hsr->sup_sequence_nr++;
 321         } else {
 322                 hsr_stag->sequence_nr = htons(hsr->sequence_nr);
 323                 hsr->sequence_nr++;
 324         }
 325
 326         hsr_stag->tlv.HSR_TLV_type = type;
 327         /* TODO: Why 12 in HSRv0? */
 328         hsr_stag->tlv.HSR_TLV_length = hsr->prot_version ?
 329                                 sizeof(struct hsr_sup_payload) : 12;
 330
 331         /* Payload: MacAddressA / SAN MAC from ProxyNodeTable */
 332         hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
 333         ether_addr_copy(hsr_sp->macaddress_A, addr);
 334
 335         if (hsr->redbox &&
 336             hsr_is_node_in_db(&hsr->proxy_node_db, addr)) {
 337                 hsr_stlv = skb_put(skb, sizeof(struct hsr_sup_tlv));
 338                 hsr_stlv->HSR_TLV_type = PRP_TLV_REDBOX_MAC;
 339                 hsr_stlv->HSR_TLV_length = sizeof(struct hsr_sup_payload);
 340
 341                 /* Payload: MacAddressRedBox */
 342                 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
 343                 ether_addr_copy(hsr_sp->macaddress_A, hsr->macaddress_redbox);
 344         }
 345
 346         if (skb_put_padto(skb, ETH_ZLEN)) {
 347                 spin_unlock_bh(&hsr->seqnr_lock);
 348                 return;
 349         }
 350
 351         hsr_forward_skb(skb, port);
 352         spin_unlock_bh(&hsr->seqnr_lock);
 353         return;
 354 }
 355
 356 static void send_prp_supervision_frame(struct hsr_port *master,
 357                                        unsigned long *interval,
 358                                        const unsigned char *addr)
 359 {
 360         struct hsr_priv *hsr = master->hsr;
 361         struct hsr_sup_payload *hsr_sp;
 362         struct hsr_sup_tag *hsr_stag;
 363         struct sk_buff *skb;
 364
 365         skb = hsr_init_skb(master);
 366         if (!skb) {
 367                 netdev_warn_once(master->dev, "PRP: Could not send supervision frame\n");
 368                 return;
 369         }
 370
 371         *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
 372         hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
 373         set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf));
 374         set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0));
 375
 376         /* From HSRv1 on we have separate supervision sequence numbers. */
 377         spin_lock_bh(&hsr->seqnr_lock);
 378         hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr);
 379         hsr->sup_sequence_nr++;
 380         hsr_stag->tlv.HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD;
 381         hsr_stag->tlv.HSR_TLV_length = sizeof(struct hsr_sup_payload);
 382
 383         /* Payload: MacAddressA */
 384         hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
 385         ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);
 386
 387         if (skb_put_padto(skb, ETH_ZLEN)) {
 388                 spin_unlock_bh(&hsr->seqnr_lock);
 389                 return;
 390         }
 391
 392         hsr_forward_skb(skb, master);
 393         spin_unlock_bh(&hsr->seqnr_lock);
 394 }
 395
 396 /* Announce (supervision frame) timer function
 397  */
 398 static void hsr_announce(struct timer_list *t)
 399 {
 400         struct hsr_priv *hsr;
 401         struct hsr_port *master;
 402         unsigned long interval;
 403
 404         hsr = from_timer(hsr, t, announce_timer);
 405
 406         rcu_read_lock();
 407         master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
 408         hsr->proto_ops->send_sv_frame(master, &interval, master->dev->dev_addr);
 409
 410         if (is_admin_up(master->dev))
 411                 mod_timer(&hsr->announce_timer, jiffies + interval);
 412
 413         rcu_read_unlock();
 414 }
 415
 416 /* Announce (supervision frame) timer function for RedBox
 417  */
 418 static void hsr_proxy_announce(struct timer_list *t)
 419 {
 420         struct hsr_priv *hsr = from_timer(hsr, t, announce_proxy_timer);
 421         struct hsr_port *interlink;
 422         unsigned long interval = 0;
 423         struct hsr_node *node;
 424
 425         rcu_read_lock();
 426         /* RedBOX sends supervisory frames to HSR network with MAC addresses
 427          * of SAN nodes stored in ProxyNodeTable.
 428          */
 429         interlink = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK);
 430         if (!interlink)
 431                 goto done;
 432
 433         list_for_each_entry_rcu(node, &hsr->proxy_node_db, mac_list) {
 434                 if (hsr_addr_is_redbox(hsr, node->macaddress_A))
 435                         continue;
 436                 hsr->proto_ops->send_sv_frame(interlink, &interval,
 437                                               node->macaddress_A);
 438         }
 439
 440         if (is_admin_up(interlink->dev)) {
 441                 if (!interval)
 442                         interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
 443
 444                 mod_timer(&hsr->announce_proxy_timer, jiffies + interval);
 445         }
 446
 447 done:
 448         rcu_read_unlock();
 449 }
 450
 451 void hsr_del_ports(struct hsr_priv *hsr)
 452 {
 453         struct hsr_port *port;
 454
 455         port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
 456         if (port)
 457                 hsr_del_port(port);
 458
 459         port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
 460         if (port)
 461                 hsr_del_port(port);
 462
 463         port = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK);
 464         if (port)
 465                 hsr_del_port(port);
 466
 467         port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
 468         if (port)
 469                 hsr_del_port(port);
 470 }
 471
 472 static void hsr_set_rx_mode(struct net_device *dev)
 473 {
 474         struct hsr_port *port;
 475         struct hsr_priv *hsr;
 476
 477         hsr = netdev_priv(dev);
 478
 479         hsr_for_each_port(hsr, port) {
 480                 if (port->type == HSR_PT_MASTER)
 481                         continue;
 482                 switch (port->type) {
 483                 case HSR_PT_SLAVE_A:
 484                 case HSR_PT_SLAVE_B:
 485                         dev_mc_sync_multiple(port->dev, dev);
 486                         dev_uc_sync_multiple(port->dev, dev);
 487                         break;
 488                 default:
 489                         break;
 490                 }
 491         }
 492 }
 493
 494 static void hsr_change_rx_flags(struct net_device *dev, int change)
 495 {
 496         struct hsr_port *port;
 497         struct hsr_priv *hsr;
 498
 499         hsr = netdev_priv(dev);
 500
 501         hsr_for_each_port(hsr, port) {
 502                 if (port->type == HSR_PT_MASTER)
 503                         continue;
 504                 switch (port->type) {
 505                 case HSR_PT_SLAVE_A:
 506                 case HSR_PT_SLAVE_B:
 507                         if (change & IFF_ALLMULTI)
 508                                 dev_set_allmulti(port->dev,
 509                                                  dev->flags &
 510                                                  IFF_ALLMULTI ? 1 : -1);
 511                         break;
 512                 default:
 513                         break;
 514                 }
 515         }
 516 }
 517
 518 static int hsr_ndo_vlan_rx_add_vid(struct net_device *dev,
 519                                    __be16 proto, u16 vid)
 520 {
 521         bool is_slave_a_added = false;
 522         bool is_slave_b_added = false;
 523         struct hsr_port *port;
 524         struct hsr_priv *hsr;
 525         int ret = 0;
 526
 527         hsr = netdev_priv(dev);
 528
 529         hsr_for_each_port(hsr, port) {
 530                 if (port->type == HSR_PT_MASTER ||
 531                     port->type == HSR_PT_INTERLINK)
 532                         continue;
 533
 534                 ret = vlan_vid_add(port->dev, proto, vid);
 535                 switch (port->type) {
 536                 case HSR_PT_SLAVE_A:
 537                         if (ret) {
 538                                 /* clean up Slave-B */
 539                                 netdev_err(dev, "add vid failed for Slave-A\n");
 540                                 if (is_slave_b_added)
 541                                         vlan_vid_del(port->dev, proto, vid);
 542                                 return ret;
 543                         }
 544
 545                         is_slave_a_added = true;
 546                         break;
 547
 548                 case HSR_PT_SLAVE_B:
 549                         if (ret) {
 550                                 /* clean up Slave-A */
 551                                 netdev_err(dev, "add vid failed for Slave-B\n");
 552                                 if (is_slave_a_added)
 553                                         vlan_vid_del(port->dev, proto, vid);
 554                                 return ret;
 555                         }
 556
 557                         is_slave_b_added = true;
 558                         break;
 559                 default:
 560                         break;
 561                 }
 562         }
 563
 564         return 0;
 565 }
 566
 567 static int hsr_ndo_vlan_rx_kill_vid(struct net_device *dev,
 568                                     __be16 proto, u16 vid)
 569 {
 570         struct hsr_port *port;
 571         struct hsr_priv *hsr;
 572
 573         hsr = netdev_priv(dev);
 574
 575         hsr_for_each_port(hsr, port) {
 576                 switch (port->type) {
 577                 case HSR_PT_SLAVE_A:
 578                 case HSR_PT_SLAVE_B:
 579                         vlan_vid_del(port->dev, proto, vid);
 580                         break;
 581                 default:
 582                         break;
 583                 }
 584         }
 585
 586         return 0;
 587 }
 588
 589 static const struct net_device_ops hsr_device_ops = {
 590         .ndo_change_mtu = hsr_dev_change_mtu,
 591         .ndo_open = hsr_dev_open,
 592         .ndo_stop = hsr_dev_close,
 593         .ndo_start_xmit = hsr_dev_xmit,
 594         .ndo_change_rx_flags = hsr_change_rx_flags,
 595         .ndo_fix_features = hsr_fix_features,
 596         .ndo_set_rx_mode = hsr_set_rx_mode,
 597         .ndo_vlan_rx_add_vid = hsr_ndo_vlan_rx_add_vid,
 598         .ndo_vlan_rx_kill_vid = hsr_ndo_vlan_rx_kill_vid,
 599 };
 600
 601 static const struct device_type hsr_type = {
 602         .name = "hsr",
 603 };
 604
 605 static struct hsr_proto_ops hsr_ops = {
 606         .send_sv_frame = send_hsr_supervision_frame,
 607         .create_tagged_frame = hsr_create_tagged_frame,
 608         .get_untagged_frame = hsr_get_untagged_frame,
 609         .drop_frame = hsr_drop_frame,
 610         .fill_frame_info = hsr_fill_frame_info,
 611         .invalid_dan_ingress_frame = hsr_invalid_dan_ingress_frame,
 612 };
 613
 614 static struct hsr_proto_ops prp_ops = {
 615         .send_sv_frame = send_prp_supervision_frame,
 616         .create_tagged_frame = prp_create_tagged_frame,
 617         .get_untagged_frame = prp_get_untagged_frame,
 618         .drop_frame = prp_drop_frame,
 619         .fill_frame_info = prp_fill_frame_info,
 620         .handle_san_frame = prp_handle_san_frame,
 621         .update_san_info = prp_update_san_info,
 622 };
 623
 624 void hsr_dev_setup(struct net_device *dev)
 625 {
 626         eth_hw_addr_random(dev);
 627
 628         ether_setup(dev);
 629         dev->min_mtu = 0;
 630         dev->header_ops = &hsr_header_ops;
 631         dev->netdev_ops = &hsr_device_ops;
 632         SET_NETDEV_DEVTYPE(dev, &hsr_type);
 633         dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
 634         /* Prevent recursive tx locking */
 635         dev->lltx = true;
 636         /* Not sure about this. Taken from bridge code. netdevice.h says
 637          * it means "Does not change network namespaces".
 638          */
 639         dev->netns_local = true;
 640
 641         dev->needs_free_netdev = true;
 642
 643         dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
 644                            NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
 645                            NETIF_F_HW_VLAN_CTAG_TX |
 646                            NETIF_F_HW_VLAN_CTAG_FILTER;
 647
 648         dev->features = dev->hw_features;
 649 }
 650
 651 /* Return true if dev is a HSR master; return false otherwise.
 652  */
 653 bool is_hsr_master(struct net_device *dev)
 654 {
 655         return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
 656 }
 657 EXPORT_SYMBOL(is_hsr_master);
 658
 659 /* Default multicast address for HSR Supervision frames */
 660 static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
 661         0x01, 0x15, 0x4e, 0x00, 0x01, 0x00
 662 };
 663
 664 int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
 665                      struct net_device *interlink, unsigned char multicast_spec,
 666                      u8 protocol_version, struct netlink_ext_ack *extack)
 667 {
 668         bool unregister = false;
 669         struct hsr_priv *hsr;
 670         int res;
 671
 672         hsr = netdev_priv(hsr_dev);
 673         INIT_LIST_HEAD(&hsr->ports);
 674         INIT_LIST_HEAD(&hsr->node_db);
 675         INIT_LIST_HEAD(&hsr->proxy_node_db);
 676         spin_lock_init(&hsr->list_lock);
 677
 678         eth_hw_addr_set(hsr_dev, slave[0]->dev_addr);
 679
 680         /* initialize protocol specific functions */
 681         if (protocol_version == PRP_V1) {
 682                 /* For PRP, lan_id has most significant 3 bits holding
 683                  * the net_id of PRP_LAN_ID
 684                  */
 685                 hsr->net_id = PRP_LAN_ID << 1;
 686                 hsr->proto_ops = &prp_ops;
 687         } else {
 688                 hsr->proto_ops = &hsr_ops;
 689         }
 690
 691         /* Make sure we recognize frames from ourselves in hsr_rcv() */
 692         res = hsr_create_self_node(hsr, hsr_dev->dev_addr,
 693                                    slave[1]->dev_addr);
 694         if (res < 0)
 695                 return res;
 696
 697         spin_lock_init(&hsr->seqnr_lock);
 698         /* Overflow soon to find bugs easier: */
 699         hsr->sequence_nr = HSR_SEQNR_START;
 700         hsr->sup_sequence_nr = HSR_SUP_SEQNR_START;
 701
 702         timer_setup(&hsr->announce_timer, hsr_announce, 0);
 703         timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0);
 704         timer_setup(&hsr->prune_proxy_timer, hsr_prune_proxy_nodes, 0);
 705         timer_setup(&hsr->announce_proxy_timer, hsr_proxy_announce, 0);
 706
 707         ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
 708         hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
 709
 710         hsr->prot_version = protocol_version;
 711
 712         /* Make sure the 1st call to netif_carrier_on() gets through */
 713         netif_carrier_off(hsr_dev);
 714
 715         res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER, extack);
 716         if (res)
 717                 goto err_add_master;
 718
 719         /* HSR forwarding offload supported in lower device? */
 720         if ((slave[0]->features & NETIF_F_HW_HSR_FWD) &&
 721             (slave[1]->features & NETIF_F_HW_HSR_FWD))
 722                 hsr->fwd_offloaded = true;
 723
 724         if ((slave[0]->features & NETIF_F_HW_VLAN_CTAG_FILTER) &&
 725             (slave[1]->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 726                 hsr_dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 727
 728         res = register_netdevice(hsr_dev);
 729         if (res)
 730                 goto err_unregister;
 731
 732         unregister = true;
 733
 734         res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack);
 735         if (res)
 736                 goto err_unregister;
 737
 738         res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B, extack);
 739         if (res)
 740                 goto err_unregister;
 741
 742         if (interlink) {
 743                 res = hsr_add_port(hsr, interlink, HSR_PT_INTERLINK, extack);
 744                 if (res)
 745                         goto err_unregister;
 746
 747                 hsr->redbox = true;
 748                 ether_addr_copy(hsr->macaddress_redbox, interlink->dev_addr);
 749                 mod_timer(&hsr->prune_proxy_timer,
 750                           jiffies + msecs_to_jiffies(PRUNE_PROXY_PERIOD));
 751         }
 752
 753         hsr_debugfs_init(hsr, hsr_dev);
 754         mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
 755
 756         return 0;
 757
 758 err_unregister:
 759         hsr_del_ports(hsr);
 760 err_add_master:
 761         hsr_del_self_node(hsr);
 762
 763         if (unregister)
 764                 unregister_netdevice(hsr_dev);
 765         return res;
 766 }