[Bug 221919] ixl: TX queue hang when using TSO and having a high and mixed network load

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221919

--- Comment #25 from Peter Eriksson <peter.x.eriksson at liu.se> ---
> Do you have any scripts that reconfigure the interface (ifconfig ixl0 down 
> up/mtu/tso) while it receives/transmits traffic?

Hmm... Aha! Bingo!

When testing on the production servers (that always receive SMB/NFS/SSH
traffic) I just did an "ifconfig lagg0 tso" to enable it and then started my
iperf3 testing (and some off and on to get test data).

I can now reliably reproduce this if I start an "iperf3" test session between
two servers and while it is running disable / enable tso "on the fly".

I can now provoke the "hang" on:
FreeBSD 11.2-RELEASE-p6 with ixl driver 1.9.9-k and firmware 5.60
FreeBSD 11.2-RELEASE-p6 with ixl driver 1.10.4 and firmware 6.80

I've not (so far) been able to provoke it to occur on:
FreeBSD 12.0-RELEASE-p0 with ixl driver 2.1.0-k and firmware 6.80

Sometimes it self-heals after a while, but most often I have to do an "ifconfig
lagg0 down ; ifconfig lagg0 up" to get it to recover.

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