bpf_redirect and xdpgeneric

Weird question:

Should there be a reason for me to expect bpf_redirect to fail when
redirecting, in XDP, to the egress of an xdpgeneric device?

I'm redirecting from an XDP program on a tap device, out the igb eno1
to the Internet (and fixing MAC addresses). I can redirect to other
tap devices, but not to eno1.

I was going to try with bpf_redirect_map, but I'm having tooling
trouble there (I can't get iproute2 to load a BPF object file with a
pinned DEVMAP; it complains that the flags don't match). But for my
purposes, bpf_redirect would be fine.

(My testbed is 5.6, for whatever that's worth).

This mailing list is fantastic and you are all excellent. Thanks
whether or not anyone has any thoughts.

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Thomas H. Ptacek