[Intel-wired-lan] FW: [PATCH bpf-next 2/4] xsk: allow AF_XDP sockets to receive packets directly from a queue

[Alexei Starovoitov]

On Thu, Oct 31, 2019 at 3:38 PM Samudrala, Sridhar
<sridhar.samudrala at intel.com> wrote:
>
> Alexei, Jakub
>
> Do you think it will be possible to avoid this overhead when mitigations are turned ON?

yes

> The other part of the overhead is going through the redirect path.
>
> Can i assume that your silence as an indication that you are now okay with optional bypass
> flag as long as it doesn't effect the normal XDP datapath. If so, i will respin and submit
> the patches against the latest bpf-next

I'm still against it.
Looks like the only motivation for it is extra overhead due to retpolines.
imo it's not a good reason to introduce a bunch of extra code helping
single kernel feature.
We will have proper solution for indirect calls.