Add a tunable/sysctl "hw.fxp_noflow" which disables flow control support

on if_fxp cards.  When flow control is enabled, if the operating system
doesn't acknowledge the packet buffer filling, the card will begin to
generate ethernet quench packets, but appears to get into a feedback
loop of some sort, hosing local switches.  This is a temporary workaround
for 5.1: the ability to configure flow control should probably be
exposed by some or another management interface on ethernet link layer
devices.

Approved by:	re (bmah)
Reviewed by:	mux

0 files changed, 0 insertions, 0 deletions