Re: [PATCH v4] netdev attribute to control xdpgeneric skb linearization

[Daniel Borkmann]

On 3/3/20 9:50 PM, Jakub Kicinski wrote:
> On Tue, 3 Mar 2020 20:46:55 +0100 Daniel Borkmann wrote:
> > Thus, when the data/data_end test fails in generic XDP, the user can
> > call e.g. bpf_xdp_pull_data(xdp, 64) to make sure we pull in as much as
> > is needed w/o full linearization and once done the data/data_end can be
> > repeated to proceed. Native XDP will leave xdp->rxq->skb as NULL, but
> > later we could perhaps reuse the same bpf_xdp_pull_data() helper for
> > native with skb-less backing. Thoughts?
>
> I'm curious why we consider a xdpgeneric-only addition. Is attaching
> a cls_bpf program noticeably slower than xdpgeneric?

Yeah, agree, I'm curious about that part as well.

Thanks,
Daniel