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 #include <linux/netpoll.h>
  37
  38 /*
  39  *      Rebuild the Ethernet MAC header. This is called after an ARP
  40  *      (or in future other address resolution) has completed on this
  41  *      sk_buff. We now let ARP fill in the other fields.
  42  *
  43  *      This routine CANNOT use cached dst->neigh!
  44  *      Really, it is used only when dst->neigh is wrong.
  45  *
  46  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  47  */
  48 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  49 {
  50         struct net_device *dev = skb->dev;
  51         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  52
  53         switch (veth->h_vlan_encapsulated_proto) {
  54 #ifdef CONFIG_INET
  55         case htons(ETH_P_IP):
  56
  57                 /* TODO:  Confirm this will work with VLAN headers... */
  58                 return arp_find(veth->h_dest, skb);
  59 #endif
  60         default:
  61                 pr_debug("%s: unable to resolve type %X addresses\n",
  62                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  63
  64                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  65                 break;
  66         }
  67
  68         return 0;
  69 }
  70
  71 static inline u16
  72 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
  73 {
  74         struct vlan_priority_tci_mapping *mp;
  75
  76         mp = vlan_dev_priv(dev)->egress_priority_map[(skb->priority & 0xF)];
  77         while (mp) {
  78                 if (mp->priority == skb->priority) {
  79                         return mp->vlan_qos; /* This should already be shifted
  80                                               * to mask correctly with the
  81                                               * VLAN's TCI */
  82                 }
  83                 mp = mp->next;
  84         }
  85         return 0;
  86 }
  87
  88 /*
  89  *      Create the VLAN header for an arbitrary protocol layer
  90  *
  91  *      saddr=NULL      means use device source address
  92  *      daddr=NULL      means leave destination address (eg unresolved arp)
  93  *
  94  *  This is called when the SKB is moving down the stack towards the
  95  *  physical devices.
  96  */
  97 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  98                                 unsigned short type,
  99                                 const void *daddr, const void *saddr,
 100                                 unsigned int len)
 101 {
 102         struct vlan_hdr *vhdr;
 103         unsigned int vhdrlen = 0;
 104         u16 vlan_tci = 0;
 105         int rc;
 106
 107         if (!(vlan_dev_priv(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 108                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 109
 110                 vlan_tci = vlan_dev_priv(dev)->vlan_id;
 111                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 112                 vhdr->h_vlan_TCI = htons(vlan_tci);
 113
 114                 /*
 115                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 116                  *  put the length in here instead.
 117                  */
 118                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 119                         vhdr->h_vlan_encapsulated_proto = htons(type);
 120                 else
 121                         vhdr->h_vlan_encapsulated_proto = htons(len);
 122
 123                 skb->protocol = htons(ETH_P_8021Q);
 124                 type = ETH_P_8021Q;
 125                 vhdrlen = VLAN_HLEN;
 126         }
 127
 128         /* Before delegating work to the lower layer, enter our MAC-address */
 129         if (saddr == NULL)
 130                 saddr = dev->dev_addr;
 131
 132         /* Now make the underlying real hard header */
 133         dev = vlan_dev_priv(dev)->real_dev;
 134         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 135         if (rc > 0)
 136                 rc += vhdrlen;
 137         return rc;
 138 }
 139
 140 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 141                                             struct net_device *dev)
 142 {
 143         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 144         unsigned int len;
 145         int ret;
 146
 147         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 148          *
 149          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 150          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 151          */
 152         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 153             vlan_dev_priv(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 154                 u16 vlan_tci;
 155                 vlan_tci = vlan_dev_priv(dev)->vlan_id;
 156                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 157                 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 158         }
 159
 160         skb_set_dev(skb, vlan_dev_priv(dev)->real_dev);
 161         len = skb->len;
 162         if (netpoll_tx_running(dev))
 163                 return skb->dev->netdev_ops->ndo_start_xmit(skb, skb->dev);
 164         ret = dev_queue_xmit(skb);
 165
 166         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 167                 struct vlan_pcpu_stats *stats;
 168
 169                 stats = this_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats);
 170                 u64_stats_update_begin(&stats->syncp);
 171                 stats->tx_packets++;
 172                 stats->tx_bytes += len;
 173                 u64_stats_update_end(&stats->syncp);
 174         } else {
 175                 this_cpu_inc(vlan_dev_priv(dev)->vlan_pcpu_stats->tx_dropped);
 176         }
 177
 178         return ret;
 179 }
 180
 181 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 182 {
 183         /* TODO: gotta make sure the underlying layer can handle it,
 184          * maybe an IFF_VLAN_CAPABLE flag for devices?
 185          */
 186         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 187                 return -ERANGE;
 188
 189         dev->mtu = new_mtu;
 190
 191         return 0;
 192 }
 193
 194 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 195                                    u32 skb_prio, u16 vlan_prio)
 196 {
 197         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 198
 199         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 200                 vlan->nr_ingress_mappings--;
 201         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 202                 vlan->nr_ingress_mappings++;
 203
 204         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 205 }
 206
 207 int vlan_dev_set_egress_priority(const struct net_device *dev,
 208                                  u32 skb_prio, u16 vlan_prio)
 209 {
 210         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 211         struct vlan_priority_tci_mapping *mp = NULL;
 212         struct vlan_priority_tci_mapping *np;
 213         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 214
 215         /* See if a priority mapping exists.. */
 216         mp = vlan->egress_priority_map[skb_prio & 0xF];
 217         while (mp) {
 218                 if (mp->priority == skb_prio) {
 219                         if (mp->vlan_qos && !vlan_qos)
 220                                 vlan->nr_egress_mappings--;
 221                         else if (!mp->vlan_qos && vlan_qos)
 222                                 vlan->nr_egress_mappings++;
 223                         mp->vlan_qos = vlan_qos;
 224                         return 0;
 225                 }
 226                 mp = mp->next;
 227         }
 228
 229         /* Create a new mapping then. */
 230         mp = vlan->egress_priority_map[skb_prio & 0xF];
 231         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 232         if (!np)
 233                 return -ENOBUFS;
 234
 235         np->next = mp;
 236         np->priority = skb_prio;
 237         np->vlan_qos = vlan_qos;
 238         vlan->egress_priority_map[skb_prio & 0xF] = np;
 239         if (vlan_qos)
 240                 vlan->nr_egress_mappings++;
 241         return 0;
 242 }
 243
 244 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 245 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 246 {
 247         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 248         u32 old_flags = vlan->flags;
 249
 250         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 251                      VLAN_FLAG_LOOSE_BINDING))
 252                 return -EINVAL;
 253
 254         vlan->flags = (old_flags & ~mask) | (flags & mask);
 255
 256         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 257                 if (vlan->flags & VLAN_FLAG_GVRP)
 258                         vlan_gvrp_request_join(dev);
 259                 else
 260                         vlan_gvrp_request_leave(dev);
 261         }
 262         return 0;
 263 }
 264
 265 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 266 {
 267         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 268 }
 269
 270 static int vlan_dev_open(struct net_device *dev)
 271 {
 272         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 273         struct net_device *real_dev = vlan->real_dev;
 274         int err;
 275
 276         if (!(real_dev->flags & IFF_UP) &&
 277             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 278                 return -ENETDOWN;
 279
 280         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 281                 err = dev_uc_add(real_dev, dev->dev_addr);
 282                 if (err < 0)
 283                         goto out;
 284         }
 285
 286         if (dev->flags & IFF_ALLMULTI) {
 287                 err = dev_set_allmulti(real_dev, 1);
 288                 if (err < 0)
 289                         goto del_unicast;
 290         }
 291         if (dev->flags & IFF_PROMISC) {
 292                 err = dev_set_promiscuity(real_dev, 1);
 293                 if (err < 0)
 294                         goto clear_allmulti;
 295         }
 296
 297         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 298
 299         if (vlan->flags & VLAN_FLAG_GVRP)
 300                 vlan_gvrp_request_join(dev);
 301
 302         if (netif_carrier_ok(real_dev))
 303                 netif_carrier_on(dev);
 304         return 0;
 305
 306 clear_allmulti:
 307         if (dev->flags & IFF_ALLMULTI)
 308                 dev_set_allmulti(real_dev, -1);
 309 del_unicast:
 310         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 311                 dev_uc_del(real_dev, dev->dev_addr);
 312 out:
 313         netif_carrier_off(dev);
 314         return err;
 315 }
 316
 317 static int vlan_dev_stop(struct net_device *dev)
 318 {
 319         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 320         struct net_device *real_dev = vlan->real_dev;
 321
 322         dev_mc_unsync(real_dev, dev);
 323         dev_uc_unsync(real_dev, dev);
 324         if (dev->flags & IFF_ALLMULTI)
 325                 dev_set_allmulti(real_dev, -1);
 326         if (dev->flags & IFF_PROMISC)
 327                 dev_set_promiscuity(real_dev, -1);
 328
 329         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 330                 dev_uc_del(real_dev, dev->dev_addr);
 331
 332         netif_carrier_off(dev);
 333         return 0;
 334 }
 335
 336 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 337 {
 338         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 339         struct sockaddr *addr = p;
 340         int err;
 341
 342         if (!is_valid_ether_addr(addr->sa_data))
 343                 return -EADDRNOTAVAIL;
 344
 345         if (!(dev->flags & IFF_UP))
 346                 goto out;
 347
 348         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 349                 err = dev_uc_add(real_dev, addr->sa_data);
 350                 if (err < 0)
 351                         return err;
 352         }
 353
 354         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 355                 dev_uc_del(real_dev, dev->dev_addr);
 356
 357 out:
 358         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 359         return 0;
 360 }
 361
 362 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 363 {
 364         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 365         const struct net_device_ops *ops = real_dev->netdev_ops;
 366         struct ifreq ifrr;
 367         int err = -EOPNOTSUPP;
 368
 369         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 370         ifrr.ifr_ifru = ifr->ifr_ifru;
 371
 372         switch (cmd) {
 373         case SIOCGMIIPHY:
 374         case SIOCGMIIREG:
 375         case SIOCSMIIREG:
 376                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 377                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 378                 break;
 379         }
 380
 381         if (!err)
 382                 ifr->ifr_ifru = ifrr.ifr_ifru;
 383
 384         return err;
 385 }
 386
 387 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 388 {
 389         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 390         const struct net_device_ops *ops = real_dev->netdev_ops;
 391         int err = 0;
 392
 393         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 394                 err = ops->ndo_neigh_setup(real_dev, pa);
 395
 396         return err;
 397 }
 398
 399 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 400 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 401                                    struct scatterlist *sgl, unsigned int sgc)
 402 {
 403         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 404         const struct net_device_ops *ops = real_dev->netdev_ops;
 405         int rc = 0;
 406
 407         if (ops->ndo_fcoe_ddp_setup)
 408                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 409
 410         return rc;
 411 }
 412
 413 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 414 {
 415         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 416         const struct net_device_ops *ops = real_dev->netdev_ops;
 417         int len = 0;
 418
 419         if (ops->ndo_fcoe_ddp_done)
 420                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 421
 422         return len;
 423 }
 424
 425 static int vlan_dev_fcoe_enable(struct net_device *dev)
 426 {
 427         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 428         const struct net_device_ops *ops = real_dev->netdev_ops;
 429         int rc = -EINVAL;
 430
 431         if (ops->ndo_fcoe_enable)
 432                 rc = ops->ndo_fcoe_enable(real_dev);
 433         return rc;
 434 }
 435
 436 static int vlan_dev_fcoe_disable(struct net_device *dev)
 437 {
 438         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 439         const struct net_device_ops *ops = real_dev->netdev_ops;
 440         int rc = -EINVAL;
 441
 442         if (ops->ndo_fcoe_disable)
 443                 rc = ops->ndo_fcoe_disable(real_dev);
 444         return rc;
 445 }
 446
 447 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 448 {
 449         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 450         const struct net_device_ops *ops = real_dev->netdev_ops;
 451         int rc = -EINVAL;
 452
 453         if (ops->ndo_fcoe_get_wwn)
 454                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 455         return rc;
 456 }
 457
 458 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 459                                     struct scatterlist *sgl, unsigned int sgc)
 460 {
 461         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 462         const struct net_device_ops *ops = real_dev->netdev_ops;
 463         int rc = 0;
 464
 465         if (ops->ndo_fcoe_ddp_target)
 466                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 467
 468         return rc;
 469 }
 470 #endif
 471
 472 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 473 {
 474         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 475
 476         if (dev->flags & IFF_UP) {
 477                 if (change & IFF_ALLMULTI)
 478                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 479                 if (change & IFF_PROMISC)
 480                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 481         }
 482 }
 483
 484 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 485 {
 486         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 487         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 488 }
 489
 490 /*
 491  * vlan network devices have devices nesting below it, and are a special
 492  * "super class" of normal network devices; split their locks off into a
 493  * separate class since they always nest.
 494  */
 495 static struct lock_class_key vlan_netdev_xmit_lock_key;
 496 static struct lock_class_key vlan_netdev_addr_lock_key;
 497
 498 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 499                                      struct netdev_queue *txq,
 500                                      void *_subclass)
 501 {
 502         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 503                                        &vlan_netdev_xmit_lock_key,
 504                                        *(int *)_subclass);
 505 }
 506
 507 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 508 {
 509         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 510                                        &vlan_netdev_addr_lock_key,
 511                                        subclass);
 512         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 513 }
 514
 515 static const struct header_ops vlan_header_ops = {
 516         .create  = vlan_dev_hard_header,
 517         .rebuild = vlan_dev_rebuild_header,
 518         .parse   = eth_header_parse,
 519 };
 520
 521 static const struct net_device_ops vlan_netdev_ops;
 522
 523 static int vlan_dev_init(struct net_device *dev)
 524 {
 525         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 526         int subclass = 0;
 527
 528         netif_carrier_off(dev);
 529
 530         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 531         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 532                                           IFF_MASTER | IFF_SLAVE);
 533         dev->iflink = real_dev->ifindex;
 534         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 535                                           (1<<__LINK_STATE_DORMANT))) |
 536                       (1<<__LINK_STATE_PRESENT);
 537
 538         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 539                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
 540                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 541                            NETIF_F_ALL_FCOE;
 542
 543         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
 544         dev->gso_max_size = real_dev->gso_max_size;
 545
 546         /* ipv6 shared card related stuff */
 547         dev->dev_id = real_dev->dev_id;
 548
 549         if (is_zero_ether_addr(dev->dev_addr))
 550                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 551         if (is_zero_ether_addr(dev->broadcast))
 552                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 553
 554 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 555         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 556 #endif
 557
 558         dev->needed_headroom = real_dev->needed_headroom;
 559         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 560                 dev->header_ops      = real_dev->header_ops;
 561                 dev->hard_header_len = real_dev->hard_header_len;
 562         } else {
 563                 dev->header_ops      = &vlan_header_ops;
 564                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 565         }
 566
 567         dev->netdev_ops = &vlan_netdev_ops;
 568
 569         if (is_vlan_dev(real_dev))
 570                 subclass = 1;
 571
 572         vlan_dev_set_lockdep_class(dev, subclass);
 573
 574         vlan_dev_priv(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 575         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 576                 return -ENOMEM;
 577
 578         return 0;
 579 }
 580
 581 static void vlan_dev_uninit(struct net_device *dev)
 582 {
 583         struct vlan_priority_tci_mapping *pm;
 584         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 585         int i;
 586
 587         free_percpu(vlan->vlan_pcpu_stats);
 588         vlan->vlan_pcpu_stats = NULL;
 589         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 590                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 591                         vlan->egress_priority_map[i] = pm->next;
 592                         kfree(pm);
 593                 }
 594         }
 595 }
 596
 597 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 598         netdev_features_t features)
 599 {
 600         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 601         u32 old_features = features;
 602
 603         features &= real_dev->vlan_features;
 604         features |= NETIF_F_RXCSUM;
 605         features &= real_dev->features;
 606
 607         features |= old_features & NETIF_F_SOFT_FEATURES;
 608         features |= NETIF_F_LLTX;
 609
 610         return features;
 611 }
 612
 613 static int vlan_ethtool_get_settings(struct net_device *dev,
 614                                      struct ethtool_cmd *cmd)
 615 {
 616         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 617
 618         return __ethtool_get_settings(vlan->real_dev, cmd);
 619 }
 620
 621 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 622                                      struct ethtool_drvinfo *info)
 623 {
 624         strcpy(info->driver, vlan_fullname);
 625         strcpy(info->version, vlan_version);
 626         strcpy(info->fw_version, "N/A");
 627 }
 628
 629 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 630 {
 631
 632         if (vlan_dev_priv(dev)->vlan_pcpu_stats) {
 633                 struct vlan_pcpu_stats *p;
 634                 u32 rx_errors = 0, tx_dropped = 0;
 635                 int i;
 636
 637                 for_each_possible_cpu(i) {
 638                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 639                         unsigned int start;
 640
 641                         p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 642                         do {
 643                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 644                                 rxpackets       = p->rx_packets;
 645                                 rxbytes         = p->rx_bytes;
 646                                 rxmulticast     = p->rx_multicast;
 647                                 txpackets       = p->tx_packets;
 648                                 txbytes         = p->tx_bytes;
 649                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 650
 651                         stats->rx_packets       += rxpackets;
 652                         stats->rx_bytes         += rxbytes;
 653                         stats->multicast        += rxmulticast;
 654                         stats->tx_packets       += txpackets;
 655                         stats->tx_bytes         += txbytes;
 656                         /* rx_errors & tx_dropped are u32 */
 657                         rx_errors       += p->rx_errors;
 658                         tx_dropped      += p->tx_dropped;
 659                 }
 660                 stats->rx_errors  = rx_errors;
 661                 stats->tx_dropped = tx_dropped;
 662         }
 663         return stats;
 664 }
 665
 666 #ifdef CONFIG_NET_POLL_CONTROLLER
 667 static void vlan_dev_poll_controller(struct net_device *dev)
 668 {
 669         return;
 670 }
 671
 672 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 673 {
 674         struct vlan_dev_priv *info = vlan_dev_priv(dev);
 675         struct net_device *real_dev = info->real_dev;
 676         struct netpoll *netpoll;
 677         int err = 0;
 678
 679         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 680         err = -ENOMEM;
 681         if (!netpoll)
 682                 goto out;
 683
 684         netpoll->dev = real_dev;
 685         strlcpy(netpoll->dev_name, real_dev->name, IFNAMSIZ);
 686
 687         err = __netpoll_setup(netpoll);
 688         if (err) {
 689                 kfree(netpoll);
 690                 goto out;
 691         }
 692
 693         info->netpoll = netpoll;
 694
 695 out:
 696         return err;
 697 }
 698
 699 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 700 {
 701         struct vlan_dev_priv *info = vlan_dev_priv(dev);
 702         struct netpoll *netpoll = info->netpoll;
 703
 704         if (!netpoll)
 705                 return;
 706
 707         info->netpoll = NULL;
 708
 709         /* Wait for transmitting packets to finish before freeing. */
 710         synchronize_rcu_bh();
 711
 712         __netpoll_cleanup(netpoll);
 713         kfree(netpoll);
 714 }
 715 #endif /* CONFIG_NET_POLL_CONTROLLER */
 716
 717 static const struct ethtool_ops vlan_ethtool_ops = {
 718         .get_settings           = vlan_ethtool_get_settings,
 719         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 720         .get_link               = ethtool_op_get_link,
 721 };
 722
 723 static const struct net_device_ops vlan_netdev_ops = {
 724         .ndo_change_mtu         = vlan_dev_change_mtu,
 725         .ndo_init               = vlan_dev_init,
 726         .ndo_uninit             = vlan_dev_uninit,
 727         .ndo_open               = vlan_dev_open,
 728         .ndo_stop               = vlan_dev_stop,
 729         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 730         .ndo_validate_addr      = eth_validate_addr,
 731         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 732         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 733         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 734         .ndo_do_ioctl           = vlan_dev_ioctl,
 735         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 736         .ndo_get_stats64        = vlan_dev_get_stats64,
 737 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 738         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 739         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 740         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 741         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 742         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 743         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 744 #endif
 745 #ifdef CONFIG_NET_POLL_CONTROLLER
 746         .ndo_poll_controller    = vlan_dev_poll_controller,
 747         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 748         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 749 #endif
 750         .ndo_fix_features       = vlan_dev_fix_features,
 751 };
 752
 753 void vlan_setup(struct net_device *dev)
 754 {
 755         ether_setup(dev);
 756
 757         dev->priv_flags         |= IFF_802_1Q_VLAN;
 758         dev->priv_flags         &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 759         dev->tx_queue_len       = 0;
 760
 761         dev->netdev_ops         = &vlan_netdev_ops;
 762         dev->destructor         = free_netdev;
 763         dev->ethtool_ops        = &vlan_ethtool_ops;
 764
 765         memset(dev->broadcast, 0, ETH_ALEN);
 766 }