On Tue, 4 Oct 2022 17:25:51 -0700 Martin KaFai Lau wrote: > A intentionally wild question, what does it take for the driver to return the > hints. Is the rx_desc and rx_queue enough? When the xdp prog is calling a > kfunc/bpf-helper, like 'hwtstamp = bpf_xdp_get_hwtstamp()', can the driver > replace it with some inline bpf code (like how the inline code is generated for > the map_lookup helper). The xdp prog can then store the hwstamp in the meta > area in any layout it wants. Since you mentioned it... FWIW that was always my preference rather than the BTF magic :) The jited image would have to be per-driver like we do for BPF offload but that's easy to do from the technical perspective (I doubt many deployments bind the same prog to multiple HW devices)..
