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Date: Wed, 8 Jan 2025 09:42:01 -0800
From: Jakub Kicinski <kuba@kernel.org>
To: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Kory Maincent <kory.maincent@bootlin.com>, Andrew Lunn
 <andrew+netdev@lunn.ch>, "David S. Miller" <davem@davemloft.net>, Eric
 Dumazet <edumazet@google.com>, Paolo Abeni <pabeni@redhat.com>, Simon
 Horman <horms@kernel.org>, Donald Hunter <donald.hunter@gmail.com>,
 Jonathan Corbet <corbet@lwn.net>, Liam Girdwood <lgirdwood@gmail.com>, Mark
 Brown <broonie@kernel.org>, Thomas Petazzoni
 <thomas.petazzoni@bootlin.com>, linux-kernel@vger.kernel.org,
 netdev@vger.kernel.org, linux-doc@vger.kernel.org, Kyle Swenson
 <kyle.swenson@est.tech>, Dent Project <dentproject@linuxfoundation.org>,
 kernel@pengutronix.de, Maxime Chevallier <maxime.chevallier@bootlin.com>
Subject: Re: [PATCH net-next 11/14] net: pse-pd: Add support for PSE device
 index
Message-ID: <20250108094201.63463180@kernel.org>
In-Reply-To: <Z34RXjqUKBdDqAGF@pengutronix.de>
References: <20250104-b4-feature_poe_arrange-v1-0-92f804bd74ed@bootlin.com>
	<20250104-b4-feature_poe_arrange-v1-11-92f804bd74ed@bootlin.com>
	<20250107171834.6e688a6b@kernel.org>
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On Wed, 8 Jan 2025 06:47:10 +0100 Oleksij Rempel wrote:
> On Tue, Jan 07, 2025 at 05:18:34PM -0800, Jakub Kicinski wrote:
> > On Sat, 04 Jan 2025 23:27:36 +0100 Kory Maincent wrote:  
> > > From: Kory Maincent (Dent Project) <kory.maincent@bootlin.com>
> > > 
> > > Add support for a PSE device index to report the PSE controller index to
> > > the user through ethtool. This will be useful for future support of power
> > > domains and port priority management.  
> > 
> > Can you say more? How do the PSE controllers relate to netdevs?
> > ethtool is primarily driven by netdev / ifindex.
> > If you're starting to build your own object hierarchy you may be
> > better off with a separate genl family.  
>             
> I hope this schema may help to explain the topology:
> 
> 	                              +--- netdev / ifindex 0
> 	    +--- PSE power domain 0 --+--- netdev / ifindex 1
>             |                         +--- netdev / ifindex 2
> PSE ctrl 0 -+
>             |                         +--- netdev / ifindex 3
>             +--- PSE power domain 1 --+--- netdev / ifindex 4
> 	                              +--- netdev / ifindex 5
> 
> 	                              +--- netdev / ifindex 6
> 	    +--- PSE power domain 2 --+--- netdev / ifindex 7
>             |                         +--- netdev / ifindex 8
> PSE ctrl 1 -+
>             |                         +--- netdev / ifindex 9
>             +--- PSE power domain 3 --+--- netdev / ifindex 10
> 	                              +--- netdev / ifindex 11
> 
> PSE device index is needed to find actually PSE controller related to
> specific netdev / ifindex.

Makes sense. So how does it end up looking in terms of APIs 
and attributes? Will we need much more than power limits at
the domain and ctrl level?