K 10
svn:author
V 8
gallatin
K 8
svn:date
V 27
2018-05-07T18:11:22.206023Z
K 7
svn:log
V 335
Fix an off-by-one error when deciding to request a tx interrupt

The canonical check for whether or not a ring is drainable is
TXQ_AVAIL() > MAX_TX_DESC() + 2.  Use this same construct here,
in order to avoid a potential off-by-one error where we might otherwise
fail to request an interrupt.

Reviewed by:	mmacy
Sponsored by:	Netflix

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