K 10
svn:author
V 7
davidcs
K 8
svn:date
V 27
2015-08-05T00:00:06.414933Z
K 7
svn:log
V 599
MFC r285973
  - Avoid lock contention in the if_transmit callback by using trylock and
   enqueueing the frames when it fails. This way there is some latency
   removed from the transmitting path.
  - If IFF_DRV_OACTIVE is set (and also if IFF_DRV_RUNNING is not) just
   enqueue the desired frames and return successful transmit. This way we
   avoid to return errors on transmit side and resulting in
   possible out-of-order frames. Please note that IFF_DRV_OACTIVE is set
   everytime we get the threshold ring hit, so this can be happening quite
   often.

Submitted by:	Attilio.Rao@isilon.com

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