netdev - Re: [PATCH net-next RFC 00/20] Introducing P4TC

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Date:   Sun, 29 Jan 2023 06:11:43 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     Willem de Bruijn <willemb@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Jamal Hadi Salim <hadi@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        kernel@...atatu.com, deb.chatterjee@...el.com,
        anjali.singhai@...el.com, namrata.limaye@...el.com,
        khalidm@...dia.com, tom@...anda.io, pratyush@...anda.io,
        xiyou.wangcong@...il.com, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, vladbu@...dia.com, simon.horman@...igine.com,
        stefanc@...vell.com, seong.kim@....com, mattyk@...dia.com,
        dan.daly@...el.com, john.andy.fingerhut@...el.com
Subject: Re: [PATCH net-next RFC 00/20] Introducing P4TC

On Sun, Jan 29, 2023 at 12:39 AM John Fastabend
<john.fastabend@...il.com> wrote:
>
> Willem de Bruijn wrote:
> > On Sat, Jan 28, 2023 at 10:10 AM Jamal Hadi Salim <jhs@...atatu.com> wrote:
> > >
>
> [...]
>
>
> Also there already exists a P4 backend that targets BPF.
>
>  https://github.com/p4lang/p4c

There's also one based on rust - does that mean we should rewrite our
code in rust?
Joking aside - rust was a suggestion made at a talk i did. I ended up
adding a slide for the next talk which read:

Title: So... how is this better than KDE?
  Attributed to Rusty Russell
     Who attributes it to Cort Dougan
      s/KDE/[rust/ebpf/dpdk/vpp/ovs]/g

We have very specific goals - of which the most important is met by
what works today and we are reusing that.

cheers,
jamal

> So as a SW object we can just do the P4 compilation step in user
> space and run it in BPF as suggested. Then for hw offload we really
> would need to see some hardware to have any concrete ideas on how
> to make it work.
>


> Also P4 defines a runtime API so would be good to see how all that
> works with any proposed offload.