On Tue, 03 Jan 2023 16:19:49 +0100 Toke Høiland-Jørgensen wrote: > Hmm, good question! I don't think we've ever explicitly documented any > assumptions one way or the other. My own mental model has certainly > always assumed the first frag would continue to be the same size as in > non-multi-buf packets. Interesting! :) My mental model was closer to GRO by frags so the linear part would have no data, just headers. A random datapoint is that bpf_xdp_adjust_head() seems to enforce that there is at least ETH_HLEN.
