Source of tap.c - linux-imx - PHYTEC BitBucket (Stash)

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    skb_reset_mac_header(skb);
    skb->protocol = eth_hdr(skb)->h_proto;
​
    if (vnet_hdr_len) {
        err = virtio_net_hdr_to_skb(skb, &vnet_hdr,
                        tap_is_little_endian(q));
        if (err)
            goto err_kfree;
    }
​
    skb_probe_transport_header(skb, ETH_HLEN);
    skb_probe_transport_header(skb);
​
    /* Move network header to the right position for VLAN tagged packets */
    if ((skb->protocol == htons(ETH_P_8021Q) ||
         skb->protocol == htons(ETH_P_8021AD)) &&
        __vlan_get_protocol(skb, skb->protocol, &depth) != 0)
        skb_set_network_header(skb, depth);
​
    rcu_read_lock();
    tap = rcu_dereference(q->tap);
    /* copy skb_ubuf_info for callback when skb has no error */
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    /* Move network header to the right position for VLAN tagged packets */
    if ((skb->protocol == htons(ETH_P_8021Q) ||
         skb->protocol == htons(ETH_P_8021AD)) &&
        __vlan_get_protocol(skb, skb->protocol, &depth) != 0)
        skb_set_network_header(skb, depth);
​
    rcu_read_lock();
    tap = rcu_dereference(q->tap);
    if (tap) {
        skb->dev = tap->dev;
        skb_probe_transport_header(skb, ETH_HLEN);
        skb_probe_transport_header(skb);
        dev_queue_xmit(skb);
    } else {
        kfree_skb(skb);
    }
    rcu_read_unlock();
​
    return 0;
​
err_kfree:
    kfree_skb(skb);