tuntap: XDP_TX can use native XDP
Now we have ndo_xdp_xmit, switch to use it instead of the slow generic XDP TX routine. XDP_TX on TAP gets ~20% improvements from ~1.5Mpps to ~1.8Mpps on 2.60GHz Core(TM) i7-5600U. Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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