virtio-net: support multi-buffer xdp
Driver can pass the skb to stack by build_skb_from_xdp_buff(). Driver forwards multi-buffer packets using the send queue when XDP_TX and XDP_REDIRECT, and clears the reference of multi pages when XDP_DROP. Signed-off-by: Heng Qi <hengqi@linux.alibaba.com> Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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