macvtap: Let TUNSETOFFLOAD actually controll offload features.
When the user issues TUNSETOFFLOAD ioctl, macvtap does not do anything other then to verify arguments. This patch adds functionality to allow users to actually control offload features. NETIF_F_GSO and NETIF_F_GRO are always on, but the rest of the features can be controlled. Signed-off-by: NVlad Yasevich <vyasevic@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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