linux-kernel - Re: [PATCH net-next v12 00/13] Add support for PSE budget evaluation strategy

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Message-ID: <20250528151715.59b8f738@kmaincent-XPS-13-7390>
Date: Wed, 28 May 2025 15:17:15 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: Paolo Abeni <pabeni@...hat.com>
Cc: Andrew Lunn <andrew@...n.ch>, Oleksij Rempel <o.rempel@...gutronix.de>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Jonathan Corbet
 <corbet@....net>, Donald Hunter <donald.hunter@...il.com>, Rob Herring
 <robh@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>, Simon Horman
 <horms@...nel.org>, Heiner Kallweit <hkallweit1@...il.com>, Russell King
 <linux@...linux.org.uk>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, Liam Girdwood <lgirdwood@...il.com>, Mark
 Brown <broonie@...nel.org>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
 linux-doc@...r.kernel.org, Kyle Swenson <kyle.swenson@....tech>, Dent
 Project <dentproject@...uxfoundation.org>, kernel@...gutronix.de, Maxime
 Chevallier <maxime.chevallier@...tlin.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Krzysztof Kozlowski
 <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH net-next v12 00/13] Add support for PSE budget
 evaluation strategy

Le Wed, 28 May 2025 09:31:20 +0200,
Paolo Abeni <pabeni@...hat.com> a écrit :

> On 5/24/25 12:56 PM, Kory Maincent wrote:
> > From: Kory Maincent (Dent Project) <kory.maincent@...tlin.com>
> > 
> > This series brings support for budget evaluation strategy in the PSE
> > subsystem. PSE controllers can set priorities to decide which ports should
> > be turned off in case of special events like over-current.
> > 
> > This patch series adds support for two budget evaluation strategy.
> > 1. Static Method:
> > 
> >    This method involves distributing power based on PD classification.
> >    It’s straightforward and stable, the PSE core keeping track of the
> >    budget and subtracting the power requested by each PD’s class.
> > 
> >    Advantages: Every PD gets its promised power at any time, which
> >    guarantees reliability.
> > 
> >    Disadvantages: PD classification steps are large, meaning devices
> >    request much more power than they actually need. As a result, the power
> >    supply may only operate at, say, 50% capacity, which is inefficient and
> >    wastes money.
> > 
> > 2. Dynamic Method:
> > 
> >    To address the inefficiencies of the static method, vendors like
> >    Microchip have introduced dynamic power budgeting, as seen in the
> >    PD692x0 firmware. This method monitors the current consumption per port
> >    and subtracts it from the available power budget. When the budget is
> >    exceeded, lower-priority ports are shut down.
> > 
> >    Advantages: This method optimizes resource utilization, saving costs.
> > 
> >    Disadvantages: Low-priority devices may experience instability.
> > 
> > The UAPI allows adding support for software port priority mode managed from
> > userspace later if needed.
> > 
> > Patches 1-2: Add support for interrupt event report in PSE core, ethtool
> > 	     and ethtool specs.
> > Patch 3: Adds support for interrupt and event report in TPS23881 driver.
> > Patches 4,5: Add support for PSE power domain in PSE core and ethtool.
> > Patches 6-8: Add support for budget evaluation strategy in PSE core,
> > 	     ethtool and ethtool specs.
> > Patches 9-11: Add support for port priority and power supplies in PD692x0
> > 	      drivers.
> > Patches 12,13: Add support for port priority in TPS23881 drivers.
> > 
> > Signed-off-by: Kory Maincent (Dent Project) <kory.maincent@...tlin.com>  
> 
> I'm sorry, even if this has been posted (just) before the merge window,
> I think an uAPI extension this late is a bit too dangerous, please
> repost when net-next will reopen after the merge window.

Ok I will.
Would it be possible to review the netlink part of the series? (patch 2, 7 and
8) 

Regard,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com