netdev - Re: [PATCH net-next 00/12] mlxsw: Preparations for XDP support

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Message-ID: <CAADnVQLJfd201t_-bgWHRJRDHm4FQDNapbmAQhPd18OEFq_QdA@mail.gmail.com>
Date: Tue, 4 Feb 2025 16:02:12 +0000
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Amit Cohen <amcohen@...dia.com>
Cc: Petr Machata <petrm@...dia.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Andrew Lunn <andrew+netdev@...n.ch>, Network Development <netdev@...r.kernel.org>, 
	Ido Schimmel <idosch@...dia.com>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, 
	John Fastabend <john.fastabend@...il.com>, bpf <bpf@...r.kernel.org>, mlxsw <mlxsw@...dia.com>
Subject: Re: [PATCH net-next 00/12] mlxsw: Preparations for XDP support

On Tue, Feb 4, 2025 at 3:59 PM Amit Cohen <amcohen@...dia.com> wrote:
>
>
>
> > -----Original Message-----
> > From: Alexei Starovoitov <alexei.starovoitov@...il.com>
> > Sent: Tuesday, 4 February 2025 17:56
> > To: Petr Machata <petrm@...dia.com>
> > Cc: David S. Miller <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni
> > <pabeni@...hat.com>; Andrew Lunn <andrew+netdev@...n.ch>; Network Development <netdev@...r.kernel.org>; Amit Cohen
> > <amcohen@...dia.com>; Ido Schimmel <idosch@...dia.com>; Alexei Starovoitov <ast@...nel.org>; Daniel Borkmann
> > <daniel@...earbox.net>; Jesper Dangaard Brouer <hawk@...nel.org>; John Fastabend <john.fastabend@...il.com>; bpf
> > <bpf@...r.kernel.org>; mlxsw <mlxsw@...dia.com>
> > Subject: Re: [PATCH net-next 00/12] mlxsw: Preparations for XDP support
> >
> > On Tue, Feb 4, 2025 at 11:06 AM Petr Machata <petrm@...dia.com> wrote:
> > >
> > > Amit Cohen writes:
> > >
> > > A future patch set will add support for XDP in mlxsw driver. This set adds
> > > some preparations.
> >
> > Why?
> > What is the goal here?
> > My understanding is that mlxsw is a hw switch and skb-s are used to
> > implement tap functionality for few listeners.
> > The volume of such packets is supposed to be small.
> > Even if XDP is added there is a huge mismatch in packet rates.
> > Hence the question. Why bother?
>
> You're right, most of packets should be handled by HW, XDP is mainly useful for telemetry.

Why skb path is not enough?