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Message-ID: <aDQ5D8EFAL6JhMbM@pengutronix.de> Date: Mon, 26 May 2025 11:49:03 +0200 From: Oleksij Rempel <o.rempel@...gutronix.de> To: Kory Maincent <kory.maincent@...tlin.com> Cc: Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 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 Hi Kory, A short positive feedback: I partially tested this series and committed patches for PSE support and impressed how easy it is now to configure and use a switch with PoE support! For testing I used "Novarq Tactical 1000" switch with Microchip EV14Y36A PSE evaluation board attached to it. I didn't had enough equipment for actual prioritization testing, otherwise I would add my Tested-by here :) Thank you! On Sat, May 24, 2025 at 12:56:02PM +0200, 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> > --- > Changes in v12: > - Rebase on net-next. > - Link to v11: https://lore.kernel.org/r/20250520-feature_poe_port_prio-v11-0-bbaf447e1b28@bootlin.com > > Changes in v11: > - Move the PSE events enum description fully in the ethtool spec. > - Remove the first patch which was useless as not used. > - Split the second patch to separate the attached_phydev introduction to > the PSE interrupt support. > - Link to v10: https://lore.kernel.org/r/20250506-feature_poe_port_prio-v10-0-55679a4895f9@bootlin.com > > Changes in v10: > - Change patch 2 and 7 due to possible used after free scenario or > deadlock scenario. Move the PSE notification send management to a > workqueue to protect it from the deadlock scenario. > - Link to v9: https://lore.kernel.org/r/20250422-feature_poe_port_prio-v9-0-417fc007572d@bootlin.com > > Changes in v9: > - Add a missing check after skb creation. > - Link to v8: https://lore.kernel.org/r/20250416-feature_poe_port_prio-v8-0-446c39dc3738@bootlin.com > > Changes in v8: > - Rename a few functions for better clarity. > - Add missing kref_init in PSE power domain support and a wrong error > check condition. > - Link to v7: https://lore.kernel.org/r/20250408-feature_poe_port_prio-v7-0-9f5fc9e329cd@bootlin.com > > Changes in v7: > - Add reference count and mutex lock for PSE power domain. > - Add support to retry enabling port that failed to be powered in case of > port disconnection or priority change. > - Use flags definition for pse events in ethtool specs. > - Small changes in the TPS23881 driver. > - Link to v6: https://lore.kernel.org/r/20250304-feature_poe_port_prio-v6-0-3dc0c5ebaf32@bootlin.com > > Changes in v6: > - Few typos. > - Use uint instead of bitset for PSE_EVENT. > - Remove report of budget evaluation strategy in the uAPI. > - Link to v5: https://lore.kernel.org/r/20250218-feature_poe_port_prio-v5-0-3da486e5fd64@bootlin.com > > Changes in v5: > - Remove the first part of the patch series which tackled PSE > improvement and already gets merged: > https://lore.kernel.org/netdev/20250110-b4-feature_poe_arrange-v3-0-142279aedb94@bootlin.com/ > - Remove the PSE index support which is useless for now. The PSE power > domain ID is sufficient. > - Add support for PD692x0 power supplies other than Vmain which was already > in the patch series. > - Few other small fixes. > - Link to v4: https://lore.kernel.org/r/20250103-feature_poe_port_prio-v4-0-dc91a3c0c187@bootlin.com > > Changes in v4: > - Remove disconnection policy. > - Rename port priority mode to budget evaluation strategy. > - Add cosmetic changes in PSE core. > - Add support for port priority in PD692x0 driver. > - Link to v3: https://lore.kernel.org/r/20241121-feature_poe_port_prio-v3-0-83299fa6967c@bootlin.com > > Changes in v3: > - Move power budget to regulator core. > - Add disconnection policies with PIs using the same priority. > - Several fixes on the TPS23881 drivers. > - Several new cosmetic patches. > - Link to v2: https://lore.kernel.org/r/20241030-feature_poe_port_prio-v2-0-9559622ee47a@bootlin.com > > Changes in v2: > - Rethink the port priority management. > - Add PSE id. > - Add support for PSE power domains. > - Add get power budget regulator constraint. > - Link to v1: https://lore.kernel.org/r/20241002-feature_poe_port_prio-v1-0-787054f74ed5@bootlin.com > > --- > Kory Maincent (13): > net: pse-pd: Introduce attached_phydev to pse control > net: pse-pd: Add support for reporting events > net: pse-pd: tps23881: Add support for PSE events and interrupts > net: pse-pd: Add support for PSE power domains > net: ethtool: Add support for new power domains index description > net: pse-pd: Add helper to report hardware enable status of the PI > net: pse-pd: Add support for budget evaluation strategies > net: ethtool: Add PSE port priority support feature > net: pse-pd: pd692x0: Add support for PSE PI priority feature > net: pse-pd: pd692x0: Add support for controller and manager power supplies > dt-bindings: net: pse-pd: microchip,pd692x0: Add manager regulator supply > net: pse-pd: tps23881: Add support for static port priority feature > dt-bindings: net: pse-pd: ti,tps23881: Add interrupt description > > .../bindings/net/pse-pd/microchip,pd692x0.yaml | 22 +- > .../bindings/net/pse-pd/ti,tps23881.yaml | 8 + > Documentation/netlink/specs/ethtool.yaml | 76 ++ > Documentation/networking/ethtool-netlink.rst | 49 + > drivers/net/mdio/fwnode_mdio.c | 26 +- > drivers/net/pse-pd/pd692x0.c | 225 +++++ > drivers/net/pse-pd/pse_core.c | 1068 +++++++++++++++++++- > drivers/net/pse-pd/tps23881.c | 403 +++++++- > include/linux/ethtool_netlink.h | 9 + > include/linux/pse-pd/pse.h | 108 +- > include/uapi/linux/ethtool_netlink_generated.h | 40 + > net/ethtool/pse-pd.c | 63 ++ > 12 files changed, 2043 insertions(+), 54 deletions(-) > --- > base-commit: 573d51a171a9237a8ecd9921d9c69af74cc51ce8 > change-id: 20240913-feature_poe_port_prio-a51aed7332ec > > Best regards, > -- > Köry Maincent, Bootlin > Embedded Linux and kernel engineering > https://bootlin.com > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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