Ring TX doorbell only if xmit_more is not set or the queue is stopped.
Suggested-by: NDaniel Borkmann <dborkman@redhat.com>
Signed-off-by: NPrashant Sreedharan <prashant@broadcom.com>
Signed-off-by: NMichael Chan <mchan@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>