[Bug 210488] ue0 axge AX88179 Ierrs errors under havy network load

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210488

--- Comment #3 from Pyun YongHyeon <yongari at FreeBSD.org> ---
(In reply to Pyun YongHyeon from comment #2)
I was able to reproduce the issue but I'm still not sure why it
happens.  Currently known workaround for the issue is enabling
Ethernet flow control like this.

#ifconfig ue0 media auto media-opt flow

The command above will re-establish a link with link partner
and enables Ethernet flow control.  Check current media with
ifconfig(8) after executing the command above.  You should see
"rxpause" and "txpause" in media row of ifconfig output when
everything goes right.
Note, link partner should also support flow control otherwise
the command above has no effect.

Probably driver needs some change on RX FIFO configuration when
flow-control is not active.  Unfortunately there is no publicly
available data sheet so I have to guess on that configuration.
If I manage to find a clue I'll let you know.

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