Re: XDP Redirect detail

[Marco <ctxspi@gmail.com>]

Hi Toke

Your information is very useful for me.

Thanks for your reply.

Marco

Il giorno sab 16 apr 2022 alle ore 19:02 Toke Høiland-Jørgensen
<toke@redhat.com> ha scritto:
>
> Marco <ctxspi@gmail.com> writes:
>
> > Hi
> >
> > Can XDP_REDIRECT forward packets to egress interface with speed
> > different than ingress interface?
> >
> > More precisely, if ingress interface speed is 100 Gbps and the egress
> > interface speed is 10 Gbps, the xdp program can be load on two
> > interfaces and forward traffic (using XDP_REDIRECT) between them?
>
> Well, yes, it can forward packets just fine; but it'll just forward each
> packet as it comes in, there's no mechanism for queueing or otherwise
> rate limiting them. 10->100G is fine, of course, but in the other
> direction, if you are receiving at 100Gbps line rate, you'll end up
> forwarding 10 Gbps of it out the 10G interface and dropping the rest,
> semi-randomly as the TX buffers overflow.
>
> We're working on adding a  queueing mechanism to XDP to help with this,
> but it'll probably be a little while yet before it surfaces...
>
> -Toke
>


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