Some ethernet PHYs allow access to raw TDR data in addition to summary diagnostics information. Add support for retrieving this data via netlink ethtool. The basic structure in the core is the same as for normal phy diagnostics, the PHY driver simply uses different helpers to fill the netlink message with different data.
There is a graphical tool under development, as well a ethtool(1) which can dump the data as text and JSON. Thanks for Chris Healy for lots of testing. Andrew Lunn (7): net: ethtool: Add attributes for cable test TDR data net: ethtool: Add generic parts of cable test TDR net: ethtool: Add helpers for cable test TDR data net: phy: marvell: Add support for amplitude graph net: ethtool: Allow PHY cable test TDR data to configured net : phy: marvell: Speedup TDR data retrieval by only changing page once net: phy: marvell: Configure TDR pulse based on measurement length Documentation/networking/ethtool-netlink.rst | 79 ++++++ drivers/net/phy/marvell.c | 276 ++++++++++++++++++- drivers/net/phy/phy.c | 67 ++++- include/linux/ethtool_netlink.h | 25 +- include/linux/phy.h | 17 ++ include/uapi/linux/ethtool_netlink.h | 67 +++++ net/ethtool/cabletest.c | 209 +++++++++++++- net/ethtool/netlink.c | 5 + net/ethtool/netlink.h | 1 + 9 files changed, 734 insertions(+), 12 deletions(-) -- 2.26.2