This patchset adds support for getting/setting the Physical Layer Collision Avoidace (PLCA) Reconciliation Sublayer (RS) configuration and status on Ethernet PHYs that supports it. PLCA is a feature that provides improved media-access performance in terms of throughput, latency and fairness for multi-drop (P2MP) half-duplex PHYs. PLCA is defined in Clause 148 of the IEEE802.3 specifications as amended by 802.3cg-2019. Currently, PLCA is supported by the 10BASE-T1S single-pair Ethernet PHY defined in the same standard and related amendments. The OPEN Alliance SIG TC14 defines additional specifications for the 10BASE-T1S PHY, including a standard register map for PHYs that embeds the PLCA RS (see PLCA management registers at https://www.opensig.org/about/specifications/). The changes proposed herein add the appropriate ethtool netlink interface for configuring the PLCA RS on PHYs that supports it. A separate patchset further modifies the ethtool userspace program to show and modify the configuration/status of the PLCA RS. Additionally, this patchset adds support for the onsemi NCN26000 Industrial Ethernet 10BASE-T1S PHY that uses the newly added PLCA infrastructure. Piergiorgio Beruto (5): net/ethtool: add netlink interface for the PLCA RS drivers/net/phy: add the link modes for the 10BASE-T1S Ethernet PHY drivers/net/phy: add connection between ethtool and phylib for PLCA drivers/net/phy: add helpers to get/set PLCA configuration drivers/net/phy: add driver for the onsemi NCN26000 10BASE-T1S PHY Documentation/networking/ethtool-netlink.rst | 138 +++++++++ MAINTAINERS | 14 + drivers/net/phy/Kconfig | 7 + drivers/net/phy/Makefile | 1 + drivers/net/phy/mdio-open-alliance.h | 46 +++ drivers/net/phy/ncn26000.c | 173 ++++++++++++ drivers/net/phy/phy-c45.c | 183 ++++++++++++ drivers/net/phy/phy-core.c | 5 +- drivers/net/phy/phy.c | 174 ++++++++++++ drivers/net/phy/phy_device.c | 17 ++ drivers/net/phy/phylink.c | 6 +- include/linux/ethtool.h | 12 + include/linux/phy.h | 84 ++++++ include/uapi/linux/ethtool.h | 3 + include/uapi/linux/ethtool_netlink.h | 25 ++ net/ethtool/Makefile | 2 +- net/ethtool/common.c | 8 + net/ethtool/netlink.c | 29 ++ net/ethtool/netlink.h | 6 + net/ethtool/plca.c | 277 +++++++++++++++++++ 20 files changed, 1207 insertions(+), 3 deletions(-) create mode 100644 drivers/net/phy/mdio-open-alliance.h create mode 100644 drivers/net/phy/ncn26000.c create mode 100644 net/ethtool/plca.c -- 2.37.4
