If the packet size is greater than mtu and the device supports chaining of
skbs, the skbs are constructed and chained in the next pointer. Then the head
skb is sent once to the driver and the driver asynchronously dispatches every
skb in the chain. This works for isolated drivers that supports async dispatch.
For this work ufo needs to be off. In recent kernels, ufo support is entirely
removed.

Signed-off-by: Vikram Narayanan <vikram186@gmail.com>