[Bug 276760] vtnet driver incorrectly calculates checksums

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276760

            Bug ID: 276760
           Summary: vtnet driver incorrectly calculates checksums
           Product: Base System
           Version: 13.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: cryptogranny@gmail.com

I've got two free virtual machines in Oracle Cloud to run a VPN service there.
I've noticed that the network speed was ok with direct connection, but was
extreamly slow, when traffic crosses vtnet and VPN interfaces (tried both IPsec
and OpenVPN).

Adding hw.vtnet.csum_disable=1 fixed the problem. Seems like it is for a while
in the wild, and still not fixed.

https://serverfault.com/questions/817664/slow-network-fixed-adding-hw-vtnet-csum-disable-1-what-are-the-posible-side-effe

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