root/net/8021q/vlan_core.c

DEFINITIONS

1. __vlan_hwaccel_rx
2. vlan_dev_real_dev
3. vlan_dev_vlan_id

#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include "vlan.h"

/* VLAN rx hw acceleration helper.  This acts like netif_{rx,receive_skb}(). */
int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
                      u16 vlan_tci, int polling)
{
        struct net_device_stats *stats;

        if (skb_bond_should_drop(skb)) {
                dev_kfree_skb_any(skb);
                return NET_RX_DROP;
        }

        skb->vlan_tci = vlan_tci;
        netif_nit_deliver(skb);

        skb->dev = vlan_group_get_device(grp, vlan_tci & VLAN_VID_MASK);
        if (skb->dev == NULL) {
                dev_kfree_skb_any(skb);
                /* Not NET_RX_DROP, this is not being dropped
                 * due to congestion. */
                return NET_RX_SUCCESS;
        }
        skb->dev->last_rx = jiffies;
        skb->vlan_tci = 0;

        stats = &skb->dev->stats;
        stats->rx_packets++;
        stats->rx_bytes += skb->len;

        skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
        switch (skb->pkt_type) {
        case PACKET_BROADCAST:
                break;
        case PACKET_MULTICAST:
                stats->multicast++;
                break;
        case PACKET_OTHERHOST:
                /* Our lower layer thinks this is not local, let's make sure.
                 * This allows the VLAN to have a different MAC than the
                 * underlying device, and still route correctly. */
                if (!compare_ether_addr(eth_hdr(skb)->h_dest,
                                        skb->dev->dev_addr))
                        skb->pkt_type = PACKET_HOST;
                break;
        };
        return (polling ? netif_receive_skb(skb) : netif_rx(skb));
}
EXPORT_SYMBOL(__vlan_hwaccel_rx);

struct net_device *vlan_dev_real_dev(const struct net_device *dev)
{
        return vlan_dev_info(dev)->real_dev;
}
EXPORT_SYMBOL_GPL(vlan_dev_real_dev);

u16 vlan_dev_vlan_id(const struct net_device *dev)
{
        return vlan_dev_info(dev)->vlan_id;
}
EXPORT_SYMBOL_GPL(vlan_dev_vlan_id);