How to get the interface index of an incoming packet in an XDP program?

[gth828r]

Hi,

I saw that the C struct xdp_md defined in the Linux headers under include/uapi/linux/bpf.h has a field ingress_ifindex. When I look at the definition of the XdpContext in Aya here I do not see a way to access that field. Is there a reason for that?

At this point I am just playing around, but one of the things I was trying to do was attach the eBPF program to multiple interfaces and get packet counters. In order to do that per-interface with the C API, I was relying on the ingress_ifindex. Is there an alternative way to do that in Aya?

Thanks!
Tim

[gth828r]

For the record, I've added support for ingress_ifindex on my local copy of Aya to support what I need, which was trivial. I am happy to create a PR, but I'm still not clear on why this wasn't added in the first place. If it was intentional, then I don't want to waste people's time with the PR.

[gth828r]

I'm opening #1140 for this and I plan to submit a PR. I'll close this out in favor of tracking the answers there.