Hello list, I configured an address in the kernel on one side of veth and attached the other side to VPP using AF_XDP, then I found that kernel-sent packets into this veth pair would be forwarded by VPP without fixing checksums. Kernel seems to believe the veth has checksum offload features, well apparently it has not; the receiver then discards all TCP/UDP packets, but ICMP packets are accepted. This can be fixed by `ethtool -K interface tx off` on the kernel side, but it is quite slow (~10Gbps); is this expected on AF_XDP with veth, or is there a toggle to fixup checksums on an AF_XDP interface, or should I use some other interface to connect to my running kernel?
I have tried `create tap`, but using vpp 22.02-release package for ubuntu focal running kernel 5.14.0-1024-oem, in rx-mode=adaptive it misses quite some packets (~3% packet loss in ping tests). Using the same 22.02-release in ubuntu focal userspace but running kernel 5.16.12-arch1-1 (this is a ubuntu chroot on arch linux) it works fine. Maybe something was fixed between the two kernels, but I want to run ubuntu kernels without busy polling, so unfortunately I cannot use tap for now.
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