This makes it possible to use some more advanced queuing
techniques with this driver.

When multi queue support will be added some changes to Byte Queue
handling is needed.
Signed-off-by: NHauke Mehrtens <hauke@hauke-m.de>
Reviewed-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>