net/8021q/vlan_dev.c

   1 /* -*- linux-c -*-
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
  10  *                - reset skb->pkt_type on incoming packets when MAC was changed
  11  *                - see that changed MAC is saddr for outgoing packets
  12  *              Oct 20, 2001:  Ard van Breeman:
  13  *                - Fix MC-list, finally.
  14  *                - Flush MC-list on VLAN destroy.
  15  *
  16  *
  17  *              This program is free software; you can redistribute it and/or
  18  *              modify it under the terms of the GNU General Public License
  19  *              as published by the Free Software Foundation; either version
  20  *              2 of the License, or (at your option) any later version.
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/ethtool.h>
  31 #include <net/arp.h>
  32
  33 #include "vlan.h"
  34 #include "vlanproc.h"
  35 #include <linux/if_vlan.h>
  36
  37 /*
  38  *      Rebuild the Ethernet MAC header. This is called after an ARP
  39  *      (or in future other address resolution) has completed on this
  40  *      sk_buff. We now let ARP fill in the other fields.
  41  *
  42  *      This routine CANNOT use cached dst->neigh!
  43  *      Really, it is used only when dst->neigh is wrong.
  44  *
  45  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  46  */
  47 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  48 {
  49         struct net_device *dev = skb->dev;
  50         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  51
  52         switch (veth->h_vlan_encapsulated_proto) {
  53 #ifdef CONFIG_INET
  54         case htons(ETH_P_IP):
  55
  56                 /* TODO:  Confirm this will work with VLAN headers... */
  57                 return arp_find(veth->h_dest, skb);
  58 #endif
  59         default:
  60                 pr_debug("%s: unable to resolve type %X addresses\n",
  61                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  62
  63                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  64                 break;
  65         }
  66
  67         return 0;
  68 }
  69
  70 static inline u16
  71 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
  72 {
  73         struct vlan_priority_tci_mapping *mp;
  74
  75         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
  76         while (mp) {
  77                 if (mp->priority == skb->priority) {
  78                         return mp->vlan_qos; /* This should already be shifted
  79                                               * to mask correctly with the
  80                                               * VLAN's TCI */
  81                 }
  82                 mp = mp->next;
  83         }
  84         return 0;
  85 }
  86
  87 /*
  88  *      Create the VLAN header for an arbitrary protocol layer
  89  *
  90  *      saddr=NULL      means use device source address
  91  *      daddr=NULL      means leave destination address (eg unresolved arp)
  92  *
  93  *  This is called when the SKB is moving down the stack towards the
  94  *  physical devices.
  95  */
  96 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  97                                 unsigned short type,
  98                                 const void *daddr, const void *saddr,
  99                                 unsigned int len)
 100 {
 101         struct vlan_hdr *vhdr;
 102         unsigned int vhdrlen = 0;
 103         u16 vlan_tci = 0;
 104         int rc;
 105
 106         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 107                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 108
 109                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 110                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 111                 vhdr->h_vlan_TCI = htons(vlan_tci);
 112
 113                 /*
 114                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 115                  *  put the length in here instead.
 116                  */
 117                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 118                         vhdr->h_vlan_encapsulated_proto = htons(type);
 119                 else
 120                         vhdr->h_vlan_encapsulated_proto = htons(len);
 121
 122                 skb->protocol = htons(ETH_P_8021Q);
 123                 type = ETH_P_8021Q;
 124                 vhdrlen = VLAN_HLEN;
 125         }
 126
 127         /* Before delegating work to the lower layer, enter our MAC-address */
 128         if (saddr == NULL)
 129                 saddr = dev->dev_addr;
 130
 131         /* Now make the underlying real hard header */
 132         dev = vlan_dev_info(dev)->real_dev;
 133         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 134         if (rc > 0)
 135                 rc += vhdrlen;
 136         return rc;
 137 }
 138
 139 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 140                                             struct net_device *dev)
 141 {
 142         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 143         unsigned int len;
 144         int ret;
 145
 146         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 147          *
 148          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 149          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 150          */
 151         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 152             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 153                 u16 vlan_tci;
 154                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 155                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 156                 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 157         }
 158
 159         skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
 160         len = skb->len;
 161         ret = dev_queue_xmit(skb);
 162
 163         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 164                 struct vlan_pcpu_stats *stats;
 165
 166                 stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats);
 167                 u64_stats_update_begin(&stats->syncp);
 168                 stats->tx_packets++;
 169                 stats->tx_bytes += len;
 170                 u64_stats_update_end(&stats->syncp);
 171         } else {
 172                 this_cpu_inc(vlan_dev_info(dev)->vlan_pcpu_stats->tx_dropped);
 173         }
 174
 175         return ret;
 176 }
 177
 178 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 179 {
 180         /* TODO: gotta make sure the underlying layer can handle it,
 181          * maybe an IFF_VLAN_CAPABLE flag for devices?
 182          */
 183         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 184                 return -ERANGE;
 185
 186         dev->mtu = new_mtu;
 187
 188         return 0;
 189 }
 190
 191 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 192                                    u32 skb_prio, u16 vlan_prio)
 193 {
 194         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 195
 196         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 197                 vlan->nr_ingress_mappings--;
 198         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 199                 vlan->nr_ingress_mappings++;
 200
 201         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 202 }
 203
 204 int vlan_dev_set_egress_priority(const struct net_device *dev,
 205                                  u32 skb_prio, u16 vlan_prio)
 206 {
 207         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 208         struct vlan_priority_tci_mapping *mp = NULL;
 209         struct vlan_priority_tci_mapping *np;
 210         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 211
 212         /* See if a priority mapping exists.. */
 213         mp = vlan->egress_priority_map[skb_prio & 0xF];
 214         while (mp) {
 215                 if (mp->priority == skb_prio) {
 216                         if (mp->vlan_qos && !vlan_qos)
 217                                 vlan->nr_egress_mappings--;
 218                         else if (!mp->vlan_qos && vlan_qos)
 219                                 vlan->nr_egress_mappings++;
 220                         mp->vlan_qos = vlan_qos;
 221                         return 0;
 222                 }
 223                 mp = mp->next;
 224         }
 225
 226         /* Create a new mapping then. */
 227         mp = vlan->egress_priority_map[skb_prio & 0xF];
 228         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 229         if (!np)
 230                 return -ENOBUFS;
 231
 232         np->next = mp;
 233         np->priority = skb_prio;
 234         np->vlan_qos = vlan_qos;
 235         vlan->egress_priority_map[skb_prio & 0xF] = np;
 236         if (vlan_qos)
 237                 vlan->nr_egress_mappings++;
 238         return 0;
 239 }
 240
 241 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 242 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 243 {
 244         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 245         u32 old_flags = vlan->flags;
 246
 247         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 248                      VLAN_FLAG_LOOSE_BINDING))
 249                 return -EINVAL;
 250
 251         vlan->flags = (old_flags & ~mask) | (flags & mask);
 252
 253         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 254                 if (vlan->flags & VLAN_FLAG_GVRP)
 255                         vlan_gvrp_request_join(dev);
 256                 else
 257                         vlan_gvrp_request_leave(dev);
 258         }
 259         return 0;
 260 }
 261
 262 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 263 {
 264         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 265 }
 266
 267 static int vlan_dev_open(struct net_device *dev)
 268 {
 269         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 270         struct net_device *real_dev = vlan->real_dev;
 271         int err;
 272
 273         if (!(real_dev->flags & IFF_UP) &&
 274             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 275                 return -ENETDOWN;
 276
 277         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 278                 err = dev_uc_add(real_dev, dev->dev_addr);
 279                 if (err < 0)
 280                         goto out;
 281         }
 282
 283         if (dev->flags & IFF_ALLMULTI) {
 284                 err = dev_set_allmulti(real_dev, 1);
 285                 if (err < 0)
 286                         goto del_unicast;
 287         }
 288         if (dev->flags & IFF_PROMISC) {
 289                 err = dev_set_promiscuity(real_dev, 1);
 290                 if (err < 0)
 291                         goto clear_allmulti;
 292         }
 293
 294         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 295
 296         if (vlan->flags & VLAN_FLAG_GVRP)
 297                 vlan_gvrp_request_join(dev);
 298
 299         if (netif_carrier_ok(real_dev))
 300                 netif_carrier_on(dev);
 301         return 0;
 302
 303 clear_allmulti:
 304         if (dev->flags & IFF_ALLMULTI)
 305                 dev_set_allmulti(real_dev, -1);
 306 del_unicast:
 307         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 308                 dev_uc_del(real_dev, dev->dev_addr);
 309 out:
 310         netif_carrier_off(dev);
 311         return err;
 312 }
 313
 314 static int vlan_dev_stop(struct net_device *dev)
 315 {
 316         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 317         struct net_device *real_dev = vlan->real_dev;
 318
 319         dev_mc_unsync(real_dev, dev);
 320         dev_uc_unsync(real_dev, dev);
 321         if (dev->flags & IFF_ALLMULTI)
 322                 dev_set_allmulti(real_dev, -1);
 323         if (dev->flags & IFF_PROMISC)
 324                 dev_set_promiscuity(real_dev, -1);
 325
 326         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 327                 dev_uc_del(real_dev, dev->dev_addr);
 328
 329         netif_carrier_off(dev);
 330         return 0;
 331 }
 332
 333 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 334 {
 335         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 336         struct sockaddr *addr = p;
 337         int err;
 338
 339         if (!is_valid_ether_addr(addr->sa_data))
 340                 return -EADDRNOTAVAIL;
 341
 342         if (!(dev->flags & IFF_UP))
 343                 goto out;
 344
 345         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 346                 err = dev_uc_add(real_dev, addr->sa_data);
 347                 if (err < 0)
 348                         return err;
 349         }
 350
 351         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 352                 dev_uc_del(real_dev, dev->dev_addr);
 353
 354 out:
 355         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 356         return 0;
 357 }
 358
 359 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 360 {
 361         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 362         const struct net_device_ops *ops = real_dev->netdev_ops;
 363         struct ifreq ifrr;
 364         int err = -EOPNOTSUPP;
 365
 366         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 367         ifrr.ifr_ifru = ifr->ifr_ifru;
 368
 369         switch (cmd) {
 370         case SIOCGMIIPHY:
 371         case SIOCGMIIREG:
 372         case SIOCSMIIREG:
 373                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 374                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 375                 break;
 376         }
 377
 378         if (!err)
 379                 ifr->ifr_ifru = ifrr.ifr_ifru;
 380
 381         return err;
 382 }
 383
 384 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 385 {
 386         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 387         const struct net_device_ops *ops = real_dev->netdev_ops;
 388         int err = 0;
 389
 390         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 391                 err = ops->ndo_neigh_setup(real_dev, pa);
 392
 393         return err;
 394 }
 395
 396 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 397 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 398                                    struct scatterlist *sgl, unsigned int sgc)
 399 {
 400         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 401         const struct net_device_ops *ops = real_dev->netdev_ops;
 402         int rc = 0;
 403
 404         if (ops->ndo_fcoe_ddp_setup)
 405                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 406
 407         return rc;
 408 }
 409
 410 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 411 {
 412         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 413         const struct net_device_ops *ops = real_dev->netdev_ops;
 414         int len = 0;
 415
 416         if (ops->ndo_fcoe_ddp_done)
 417                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 418
 419         return len;
 420 }
 421
 422 static int vlan_dev_fcoe_enable(struct net_device *dev)
 423 {
 424         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 425         const struct net_device_ops *ops = real_dev->netdev_ops;
 426         int rc = -EINVAL;
 427
 428         if (ops->ndo_fcoe_enable)
 429                 rc = ops->ndo_fcoe_enable(real_dev);
 430         return rc;
 431 }
 432
 433 static int vlan_dev_fcoe_disable(struct net_device *dev)
 434 {
 435         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 436         const struct net_device_ops *ops = real_dev->netdev_ops;
 437         int rc = -EINVAL;
 438
 439         if (ops->ndo_fcoe_disable)
 440                 rc = ops->ndo_fcoe_disable(real_dev);
 441         return rc;
 442 }
 443
 444 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 445 {
 446         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 447         const struct net_device_ops *ops = real_dev->netdev_ops;
 448         int rc = -EINVAL;
 449
 450         if (ops->ndo_fcoe_get_wwn)
 451                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 452         return rc;
 453 }
 454
 455 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 456                                     struct scatterlist *sgl, unsigned int sgc)
 457 {
 458         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 459         const struct net_device_ops *ops = real_dev->netdev_ops;
 460         int rc = 0;
 461
 462         if (ops->ndo_fcoe_ddp_target)
 463                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 464
 465         return rc;
 466 }
 467 #endif
 468
 469 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 470 {
 471         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 472
 473         if (dev->flags & IFF_UP) {
 474                 if (change & IFF_ALLMULTI)
 475                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 476                 if (change & IFF_PROMISC)
 477                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 478         }
 479 }
 480
 481 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 482 {
 483         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 484         dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 485 }
 486
 487 /*
 488  * vlan network devices have devices nesting below it, and are a special
 489  * "super class" of normal network devices; split their locks off into a
 490  * separate class since they always nest.
 491  */
 492 static struct lock_class_key vlan_netdev_xmit_lock_key;
 493 static struct lock_class_key vlan_netdev_addr_lock_key;
 494
 495 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 496                                      struct netdev_queue *txq,
 497                                      void *_subclass)
 498 {
 499         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 500                                        &vlan_netdev_xmit_lock_key,
 501                                        *(int *)_subclass);
 502 }
 503
 504 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 505 {
 506         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 507                                        &vlan_netdev_addr_lock_key,
 508                                        subclass);
 509         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 510 }
 511
 512 static const struct header_ops vlan_header_ops = {
 513         .create  = vlan_dev_hard_header,
 514         .rebuild = vlan_dev_rebuild_header,
 515         .parse   = eth_header_parse,
 516 };
 517
 518 static const struct net_device_ops vlan_netdev_ops;
 519
 520 static int vlan_dev_init(struct net_device *dev)
 521 {
 522         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 523         int subclass = 0;
 524
 525         netif_carrier_off(dev);
 526
 527         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 528         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 529                                           IFF_MASTER | IFF_SLAVE);
 530         dev->iflink = real_dev->ifindex;
 531         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 532                                           (1<<__LINK_STATE_DORMANT))) |
 533                       (1<<__LINK_STATE_PRESENT);
 534
 535         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 536                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
 537                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 538                            NETIF_F_ALL_FCOE;
 539
 540         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
 541         dev->gso_max_size = real_dev->gso_max_size;
 542
 543         /* ipv6 shared card related stuff */
 544         dev->dev_id = real_dev->dev_id;
 545
 546         if (is_zero_ether_addr(dev->dev_addr))
 547                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 548         if (is_zero_ether_addr(dev->broadcast))
 549                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 550
 551 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 552         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 553 #endif
 554
 555         dev->needed_headroom = real_dev->needed_headroom;
 556         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 557                 dev->header_ops      = real_dev->header_ops;
 558                 dev->hard_header_len = real_dev->hard_header_len;
 559         } else {
 560                 dev->header_ops      = &vlan_header_ops;
 561                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 562         }
 563
 564         dev->netdev_ops = &vlan_netdev_ops;
 565
 566         if (is_vlan_dev(real_dev))
 567                 subclass = 1;
 568
 569         vlan_dev_set_lockdep_class(dev, subclass);
 570
 571         vlan_dev_info(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 572         if (!vlan_dev_info(dev)->vlan_pcpu_stats)
 573                 return -ENOMEM;
 574
 575         return 0;
 576 }
 577
 578 static void vlan_dev_uninit(struct net_device *dev)
 579 {
 580         struct vlan_priority_tci_mapping *pm;
 581         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 582         int i;
 583
 584         free_percpu(vlan->vlan_pcpu_stats);
 585         vlan->vlan_pcpu_stats = NULL;
 586         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 587                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 588                         vlan->egress_priority_map[i] = pm->next;
 589                         kfree(pm);
 590                 }
 591         }
 592 }
 593
 594 static u32 vlan_dev_fix_features(struct net_device *dev, u32 features)
 595 {
 596         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 597         u32 old_features = features;
 598
 599         features &= real_dev->features;
 600         features &= real_dev->vlan_features;
 601
 602         features |= old_features & NETIF_F_SOFT_FEATURES;
 603
 604         if (dev_ethtool_get_rx_csum(real_dev))
 605                 features |= NETIF_F_RXCSUM;
 606         features |= NETIF_F_LLTX;
 607
 608         return features;
 609 }
 610
 611 static int vlan_ethtool_get_settings(struct net_device *dev,
 612                                      struct ethtool_cmd *cmd)
 613 {
 614         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 615
 616         return __ethtool_get_settings(vlan->real_dev, cmd);
 617 }
 618
 619 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 620                                      struct ethtool_drvinfo *info)
 621 {
 622         strcpy(info->driver, vlan_fullname);
 623         strcpy(info->version, vlan_version);
 624         strcpy(info->fw_version, "N/A");
 625 }
 626
 627 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 628 {
 629
 630         if (vlan_dev_info(dev)->vlan_pcpu_stats) {
 631                 struct vlan_pcpu_stats *p;
 632                 u32 rx_errors = 0, tx_dropped = 0;
 633                 int i;
 634
 635                 for_each_possible_cpu(i) {
 636                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 637                         unsigned int start;
 638
 639                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats, i);
 640                         do {
 641                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 642                                 rxpackets       = p->rx_packets;
 643                                 rxbytes         = p->rx_bytes;
 644                                 rxmulticast     = p->rx_multicast;
 645                                 txpackets       = p->tx_packets;
 646                                 txbytes         = p->tx_bytes;
 647                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 648
 649                         stats->rx_packets       += rxpackets;
 650                         stats->rx_bytes         += rxbytes;
 651                         stats->multicast        += rxmulticast;
 652                         stats->tx_packets       += txpackets;
 653                         stats->tx_bytes         += txbytes;
 654                         /* rx_errors & tx_dropped are u32 */
 655                         rx_errors       += p->rx_errors;
 656                         tx_dropped      += p->tx_dropped;
 657                 }
 658                 stats->rx_errors  = rx_errors;
 659                 stats->tx_dropped = tx_dropped;
 660         }
 661         return stats;
 662 }
 663
 664 static const struct ethtool_ops vlan_ethtool_ops = {
 665         .get_settings           = vlan_ethtool_get_settings,
 666         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 667         .get_link               = ethtool_op_get_link,
 668 };
 669
 670 static const struct net_device_ops vlan_netdev_ops = {
 671         .ndo_change_mtu         = vlan_dev_change_mtu,
 672         .ndo_init               = vlan_dev_init,
 673         .ndo_uninit             = vlan_dev_uninit,
 674         .ndo_open               = vlan_dev_open,
 675         .ndo_stop               = vlan_dev_stop,
 676         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 677         .ndo_validate_addr      = eth_validate_addr,
 678         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 679         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 680         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 681         .ndo_do_ioctl           = vlan_dev_ioctl,
 682         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 683         .ndo_get_stats64        = vlan_dev_get_stats64,
 684 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 685         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 686         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 687         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 688         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 689         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 690         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 691 #endif
 692         .ndo_fix_features       = vlan_dev_fix_features,
 693 };
 694
 695 void vlan_setup(struct net_device *dev)
 696 {
 697         ether_setup(dev);
 698
 699         dev->priv_flags         |= IFF_802_1Q_VLAN;
 700         dev->priv_flags         &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 701         dev->tx_queue_len       = 0;
 702
 703         dev->netdev_ops         = &vlan_netdev_ops;
 704         dev->destructor         = free_netdev;
 705         dev->ethtool_ops        = &vlan_ethtool_ops;
 706
 707         memset(dev->broadcast, 0, ETH_ALEN);
 708 }