[Bug 289907] cxlv: problem with receive checksum offload

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289907

--- Comment #2 from John Nielsen <john@jnielsen.net> ---
See also my post about this issue and followups:
https://lists.freebsd.org/archives/freebsd-net/2025-September/007641.html

Michael has pinpointed the issue much more clearly than I was able to, but
would love a fix that allows rxcsum on cxgbev to work correctly without any
additional tuning or configuration.

Happy to provide information from any of the machines I have, including a
FreeBSD 14-STABLE host with a T520 card and bhyve VMs (working correctly with
cxgbev) and an Arch Linux host with a T520 card and KVM/libvirtd VMs (another
guest running Windows 11 works correctly, FreeBSD guest needs -rxcsum to
process incoming packets). The FreeBSD VM is running 15-STABLE as of Saturday
(15.0-ALPHA4) but also showed the same behavior under 14-STABLE.

If comparison on the same hardware would be useful I can also boot the Arch
Linux machine into FreeBSD temporarily and run a bhyve VM to see if it still
exhibits the problem.

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