From: Kory Maincent (Dent Project) <kory.maincent@xxxxxxxxxxx> This series brings support for port priority 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. I have added regulator maintainers to have their opinion on adding power budget regulator constraint see patches 11 and 12. This patch series adds support for two mode port priority modes. 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. This patch series is currently untested and still lacks driver-level support for port priority. I would appreciate your feedback on the current implementation of port priority in the PSE core before proceeding further. Several Reviewed-by have been removed due to the changes. Thanks Oleksij for your pointers. Patches 1-3: Cosmetics. Patch 4: Adds support for last supported features in the TPS23881 drivers. Patches 5,6: Add support for PSE index in PSE core and ethtool. Patches 7-9: Add support for interrupt event report in PSE core, ethtool and ethtool specs. Patch 10: Adds support for interrupt and event report in TPS23881 driver. Patches 11,12: Add support for power budget in regulator framework. Patches 13,14: Add support for PSE power domain in PSE core and ethtool. Patches 15-17: Add support for port priority in PSE core, ethtool and ethtool specs. Patches 18: Add support for port priority in PD692x0 drivers. Signed-off-by: Kory Maincent <kory.maincent@xxxxxxxxxxx> --- 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@xxxxxxxxxxx --- Kory Maincent (18): net: pse-pd: Remove unused pse_ethtool_get_pw_limit function declaration net: pse-pd: tps23881: Simplify function returns by removing redundant checks net: pse-pd: tps23881: Use helpers to calculate bit offset for a channel net: pse-pd: tps23881: Add support for power limit and measurement features net: pse-pd: Add support for PSE device index net: ethtool: Add support for new PSE device index description net: ethtool: Add support for ethnl_info_init_ntf helper function net: pse-pd: Add support for reporting events netlink: specs: Add support for PSE netlink notifications net: pse-pd: tps23881: Add support for PSE events and interrupts regulator: Add support for power budget description regulator: dt-bindings: Add regulator-power-budget property net: pse-pd: Add support for PSE power domains net: ethtool: Add support for new power domains index description net: pse-pd: Add support for getting and setting port priority net: ethtool: Add PSE new port priority support feature netlink: specs: Expand the PSE netlink command with newly supported features net: pse-pd: pd692x0: Add support for PSE PI priority feature .../devicetree/bindings/regulator/regulator.yaml | 3 + Documentation/netlink/specs/ethtool.yaml | 53 ++ Documentation/networking/ethtool-netlink.rst | 71 +++ drivers/net/mdio/fwnode_mdio.c | 26 +- drivers/net/pse-pd/pd692x0.c | 24 + drivers/net/pse-pd/pse_core.c | 568 ++++++++++++++++++++- drivers/net/pse-pd/tps23881.c | 529 ++++++++++++++++--- drivers/regulator/core.c | 11 + drivers/regulator/of_regulator.c | 3 + include/linux/ethtool_netlink.h | 9 + include/linux/pse-pd/pse.h | 75 ++- include/linux/regulator/consumer.h | 6 + include/linux/regulator/machine.h | 2 + include/uapi/linux/ethtool.h | 35 ++ include/uapi/linux/ethtool_netlink.h | 17 + net/ethtool/netlink.c | 5 + net/ethtool/netlink.h | 2 + net/ethtool/pse-pd.c | 93 ++++ 18 files changed, 1442 insertions(+), 90 deletions(-) --- base-commit: 982a5437362e09def6c3152a9ec1392b9da16ece change-id: 20240913-feature_poe_port_prio-a51aed7332ec Best regards, -- Köry Maincent, Bootlin Embedded Linux and kernel engineering https://bootlin.com
