net/8021q/vlan_core.c

   1 #include <linux/skbuff.h>
   2 #include <linux/netdevice.h>
   3 #include <linux/if_vlan.h>
   4 #include <linux/netpoll.h>
   5 #include "vlan.h"
   6
   7 bool vlan_hwaccel_do_receive(struct sk_buff **skbp)
   8 {
   9         struct sk_buff *skb = *skbp;
  10         u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
  11         struct net_device *vlan_dev;
  12         struct vlan_rx_stats *rx_stats;
  13
  14         vlan_dev = vlan_find_dev(skb->dev, vlan_id);
  15         if (!vlan_dev) {
  16                 if (vlan_id)
  17                         skb->pkt_type = PACKET_OTHERHOST;
  18                 return false;
  19         }
  20
  21         skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
  22         if (unlikely(!skb))
  23                 return false;
  24
  25         skb->dev = vlan_dev;
  26         skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
  27         skb->vlan_tci = 0;
  28
  29         rx_stats = this_cpu_ptr(vlan_dev_info(vlan_dev)->vlan_rx_stats);
  30
  31         u64_stats_update_begin(&rx_stats->syncp);
  32         rx_stats->rx_packets++;
  33         rx_stats->rx_bytes += skb->len;
  34
  35         switch (skb->pkt_type) {
  36         case PACKET_BROADCAST:
  37                 break;
  38         case PACKET_MULTICAST:
  39                 rx_stats->rx_multicast++;
  40                 break;
  41         case PACKET_OTHERHOST:
  42                 /* Our lower layer thinks this is not local, let's make sure.
  43                  * This allows the VLAN to have a different MAC than the
  44                  * underlying device, and still route correctly. */
  45                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
  46                                         vlan_dev->dev_addr))
  47                         skb->pkt_type = PACKET_HOST;
  48                 break;
  49         }
  50         u64_stats_update_end(&rx_stats->syncp);
  51
  52         return true;
  53 }
  54
  55 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
  56 {
  57         return vlan_dev_info(dev)->real_dev;
  58 }
  59 EXPORT_SYMBOL(vlan_dev_real_dev);
  60
  61 u16 vlan_dev_vlan_id(const struct net_device *dev)
  62 {
  63         return vlan_dev_info(dev)->vlan_id;
  64 }
  65 EXPORT_SYMBOL(vlan_dev_vlan_id);
  66
  67 /* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
  68 int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
  69                       u16 vlan_tci, int polling)
  70 {
  71         __vlan_hwaccel_put_tag(skb, vlan_tci);
  72         return polling ? netif_receive_skb(skb) : netif_rx(skb);
  73 }
  74 EXPORT_SYMBOL(__vlan_hwaccel_rx);
  75
  76 gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
  77                               unsigned int vlan_tci, struct sk_buff *skb)
  78 {
  79         __vlan_hwaccel_put_tag(skb, vlan_tci);
  80         return napi_gro_receive(napi, skb);
  81 }
  82 EXPORT_SYMBOL(vlan_gro_receive);
  83
  84 gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
  85                             unsigned int vlan_tci)
  86 {
  87         __vlan_hwaccel_put_tag(napi->skb, vlan_tci);
  88         return napi_gro_frags(napi);
  89 }
  90 EXPORT_SYMBOL(vlan_gro_frags);