[Bug 221317] ifconfig down/up issue after ixgbe driver update in r320897

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221317

--- Comment #49 from Peter Vanek <pv at efficientip.com> ---
Hello all,

Just brief summary of our test yesterday:
Network Adapter X520

1. issue re-tested on default kernel

FreeBSD testing-host 11.2-STABLE FreeBSD 11.2-STABLE #274 r345055M: Tue Mar 12
18:46:49 UTC 2019

ix0 card will stay in down after few rounds of up and down.

Issue present - OK

================================

2. Applied patch

Script executing down/up on both ix0 and ix1 for 1000 times, waiting 2 seconds
sleep and displaying status of both interfaces
then continuing in next 1000 times of down/up

After few hours of stressing... result is good and we have both ix0 and ix1
full up and functional.

One more time thanks @Piotr for passing this patch to here.

Best Regards,
Peter

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