Hans Petter Selasky af89c4aff6 Optimise use of doorbell and remove redundant NOPs
Store the last doorbell write in the mlx5e_sq structure and write the
doorbell to the hardware when the transmit routine finishes
transmitting all queued mbufs.

Sponsored by:	Mellanox Technologies
Tested by:	Netflix
MFC after:	1 week
2016-05-20 06:59:38 +00:00
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