K 10
svn:author
V 8
jhibbits
K 8
svn:date
V 27
2017-04-04T02:48:27.034615Z
K 7
svn:log
V 404
Defragment the transmit mbuf chain only if necessary.

Use a method similar to the if_dwc driver.  Use a wmb() before the flags of the
first transmit buffer of a frame are written.

Group transmit/receive structure members for better cache efficiency.

Tested on P1020RDB.  TCP transmit throughput increases from 60MiB/s to
90MiB/s.

Submitted by:	Sebastian Huber <sebastian.huber_AT_embedded-brains.de>

END