On 4/16/21 5:03 AM, Konrad Zemek wrote: > So both vlan fields in the output struct bpf_fib_lookup are always zero. I > haven't seen this commented on anywhere, including the discussion around > introducing bpf_fib_lookup, so I assume it's an accidental oversight. The uapi was setup to cover the use case, but VLANs are not supported at the moment. > > Do you have any proposals for a workaround? Right now I'm thinking of > creating a BPF map that would map ifindex->vlan, populated in the userspace > - but that assumes the output (struct bpf_fib_lookup*)->ifindex will be an > index of the vlan device and not the physical device the vlan is attached > on, which I'm not sure is the case yet. > vlan netdevices do not support XDP redirect. It's not a trivial problem to handle VLANs or stacked devices in general. I have working code here: https://github.com/dsahern/linux/commits/bpf/mpls-vlan-fwd but it is not ready for submitting upstream yet. The use case and related ones need more work.
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