I'd like to discuss a potential follow up for the previous "XDP RX metadata" series [0]. Now that we can access (a subset of) packet metadata at RX, I'd like to explore the options where we can export some of that metadata on TX. And also whether it might be possible to access some of the TX completion metadata (things like TX timestamp). I'm currently trying to understand whether the same approach I've used on RX could work at TX. By May I plan to have a bunch of options laid out (currently considering XSK tx/compl programs and XDP tx/compl programs) so we have something to discuss. I'd like to some more input on whether applying the same idea on TX makes sense or not and whether there are any sensible alternatives. (IIRC, there was an attempt to do XDP on egress that went nowhere). 0: https://lore.kernel.org/bpf/20230119221536.3349901-1-sdf@xxxxxxxxxx/
