xen-netfront: request Tx response events more often

Trying to batch Tx response events results in poor performance because
this delays freeing the transmitted skbs.

Instead use the standard RING_FINAL_CHECK_FOR_RESPONSES() macro to be
notified once the next Tx response is placed on the ring.

Signed-off-by: Malcolm Crossley <[email protected]>
Signed-off-by: David Vrabel <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
1 file changed