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For small packets we can simplify xmit processing by linearizing buffers with the header: most packets seem to have enough head room we can use for this purpose. Since existing hypervisors require that header is the first s/g element, we need a feature bit for this. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>