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Message-ID: <20230130201224.435a4b5e@kernel.org>
Date: Mon, 30 Jan 2023 20:12:24 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: John Fastabend <john.fastabend@...il.com>,
"Singhai, Anjali" <anjali.singhai@...el.com>,
Toke Høiland-Jørgensen <toke@...hat.com>,
Jamal Hadi Salim <hadi@...atatu.com>,
Jiri Pirko <jiri@...nulli.us>,
Willem de Bruijn <willemb@...gle.com>,
Stanislav Fomichev <sdf@...gle.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"kernel@...atatu.com" <kernel@...atatu.com>,
"Chatterjee, Deb" <deb.chatterjee@...el.com>,
"Limaye, Namrata" <namrata.limaye@...el.com>,
"khalidm@...dia.com" <khalidm@...dia.com>,
"tom@...anda.io" <tom@...anda.io>,
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"Fingerhut, John Andy" <john.andy.fingerhut@...el.com>
Subject: Re: [PATCH net-next RFC 00/20] Introducing P4TC
On Mon, 30 Jan 2023 19:26:05 -0500 Jamal Hadi Salim wrote:
> > Didn't see this as it was top posted but, the answer is you don't program
> > hardware the ebpf when your underlying target is a MAT.
> >
> > Use devlink for the runtime programming as well, its there to program
> > hardware. This "Devlink is NOT for the runtime programming" is
> > just an artificate of the design here which I disagree with and it feels
> > like many other folks also disagree.
>
> We are going to need strong justification to use devlink for
> programming the binary interface to begin with
We may disagree on direction, but we should agree status quo / reality.
What John described is what we suggested to Intel to do (2+ years ago),
and what is already implemented upstream. Grep for DDP.
IIRC my opinion back then was that unless kernel has any use for
whatever the configuration exposes - we should stay out of it.
> - see the driver models discussion.
>
> And let me get this clear: you are suggesting we
> use it for runtime and redo all that tc ndo and associated infra?
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