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Sometimes usespace may need to active/deactive a queue, this could be done by detaching and attaching a file from tuntap device. This patch introduces a new ioctls - TUNSETQUEUE which could be used to do this. Flag IFF_ATTACH_QUEUE were introduced to do attaching while IFF_DETACH_QUEUE were introduced to do the detaching. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>