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Currently users of hardware vlan accleration need to know whether the device supports it before generating packets. However, vlan acceleration will soon be available in a more flexible manner so knowing ahead of time becomes much more difficult. This adds a software fallback path for vlan packets on devices without the necessary offloading support, similar to other types of hardware accleration. Signed-off-by: Jesse Gross <jesse@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>