netdev - Re: [RFC net-next 0/5] Add ETS and TBF Qdisc offload for Airoha EN7581 SoC

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Message-ID: <Z2FRP6K0uZRyvtUC@pengutronix.de>
Date: Tue, 17 Dec 2024 11:23:59 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Lorenzo Bianconi <lorenzo@...nel.org>,
	Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
	Oleksij Rempel <linux@...pel-privat.de>, netdev@...r.kernel.org,
	andrew@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, horms@...nel.org, nbd@....name,
	sean.wang@...iatek.com, Mark-MC.Lee@...iatek.com,
	lorenzo.bianconi83@...il.com
Subject: Re: [RFC net-next 0/5] Add ETS and TBF Qdisc offload for Airoha
 EN7581 SoC

On Tue, Dec 17, 2024 at 12:17:24PM +0200, Vladimir Oltean wrote:
> On Tue, Dec 17, 2024 at 11:01:28AM +0100, Lorenzo Bianconi wrote:
> > I agree it is unnecessary, but w/o it we must rely on limited QoS capabilities
> > of the hw dsa switch. The goal of the series is just exploit enhanced QoS
> > capabilities available on the EN7581 SoC.
> (...)
> > AFIR there is even the possibility to configure inter-channel QoS on the chip,
> > like a Round Robin scheduler or Strict-Priority between channels.
> 
> So the conclusion of both these statements is that it would be good to understand
> the QoS algorithm among channels of the MAC chip, see if there is any classful
> root Qdisc which can describe that algorithm, then offload it with ndo_setup_tc(),
> then assign traffic to user ports probably using a software classifier + flowid.
> The ETS Qdiscs which you are trying to add here should not be attached to the root
> egress Qdisc of DSA user ports, but to the classes of this unknown conduit root
> Qdisc. Agree?

I would love to have some kind of easy to use DSA user ports classifiers.

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