netdev - Re: Basic PCP/DEI-based queue classification

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Message-ID: <20220829075342.5ztd5hf4sznl7req@lx-anielsen>
Date:   Mon, 29 Aug 2022 09:53:42 +0200
From:   "Allan W. Nielsen" <Allan.Nielsen@...rochip.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     Petr Machata <petrm@...dia.com>, <Daniel.Machon@...rochip.com>,
        <netdev@...r.kernel.org>, <vinicius.gomes@...el.com>,
        <vladimir.oltean@....com>, <thomas.petazzoni@...tlin.com>,
        <maxime.chevallier@...tlin.com>, <roopa@...dia.com>
Subject: Re: Basic PCP/DEI-based queue classification

Hi,

On 24.08.2022 17:54, Jakub Kicinski wrote:
>For an uneducated maintainer like myself, how do embedded people look
>at DCB? Only place I've seen it used is in RDMA clusers. I suggested
>to Vladimir to look at DCBNL for frame preemption because it's the only
>existing API we have that's vaguely relevant to HW/prio control but he
>ended up going with ethtool.
>No preference here, just trying to map it out in my head.

As I work toghether with Daniel, I'm biased. But I work a lot with
embedded devices ;-)

I think this feature belong in DCB simply because DCB already have the
related configurations (like the default prio, priority-flow-control
etc), and it will be more logical for the user to find the PCP mapping
in the same place.

I think that framepreemption should be in ethtool as it is partly
defined in IEEE802.3 (the physical layer) and it is ethernet only
technology.

/Allan