K 10
svn:author
V 5
gonzo
K 8
svn:date
V 27
2017-11-04T23:28:02.477714Z
K 7
svn:log
V 597
Increase TX_MAX_SEGS from 10 to 20 for the if_awg.c driver

Under certain traffic pattern awg driver does not recover from TX queue
full condition. The actual source of the problem is not identified yet
but jmcneill@ agreed that bumping TX_MAX_SEGS to 20 is OK as a workaround
for the problem (NetBSD has it set to 128).

Also add some diagnostic printfs to prevent silent failure of bus_dma
functions in the future

PR will be kept open until root cause of the issue is identified and fixed

PR:		219927
Submitted by:	Tom Vijlbrief <tvijlbrief@gmail.com>
Approved by:	jmcneill
MFC after:	2 weeks

END