linux-kernel - Re: [RFC net-next 1/2] netdev-genl: Add an XSK attribute to queues

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Message-ID: <20250129175224.1613aac1@kernel.org>
Date: Wed, 29 Jan 2025 17:52:24 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Joe Damato <jdamato@...tly.com>
Cc: netdev@...r.kernel.org, sridhar.samudrala@...el.com, Donald Hunter
 <donald.hunter@...il.com>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon
 Horman <horms@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>, Xuan Zhuo
 <xuanzhuo@...ux.alibaba.com>, Mina Almasry <almasrymina@...gle.com>, Martin
 Karsten <mkarsten@...terloo.ca>, Amritha Nambiar
 <amritha.nambiar@...el.com>, Stanislav Fomichev <sdf@...ichev.me>, Daniel
 Jurgens <danielj@...dia.com>, linux-kernel@...r.kernel.org (open list)
Subject: Re: [RFC net-next 1/2] netdev-genl: Add an XSK attribute to queues

On Wed, 29 Jan 2025 17:24:24 +0000 Joe Damato wrote:
> Expose a new per-queue attribute, xsk, which indicates that a queue is
> being used for AF_XDP. Update the documentation to more explicitly state
> which queue types are linked.

Let's do the same thing we did for io_uring queues? An empty nest:
https://lore.kernel.org/all/20250116231704.2402455-6-dw@davidwei.uk/

At the protocol level nest is both smaller and more flexible.
It's just 4B with zero length and a "this is a nest" flag.
We can add attributes to it as we think of things to express.