This series adds a new ethtool command to read well defined device statistics. There is nothing clever here, just a netlink API for dumping statistics defined by standards and RFCs which today end up in ethtool -S under infinite variations of names.
This series adds basic IEEE stats (for PHY, MAC, Ctrl frames) and RMON stats. AFAICT other RFCs only duplicate the IEEE stats. This series does _not_ add a netlink API to read driver-defined stats. There seems to be little to gain from moving that part to netlink. The netlink message format is very simple, and aims to allow adding stats and groups with no changes to user tooling (which IIUC is expected for ethtool). Stats are dumped directly into netlink with netlink attributes used as IDs. This is perhaps where the biggest question mark is. We could instead pack the stats into individual wrappers: [grp] [stat] // nest [id] // u32 [value] // u64 [stat] // nest [id] // u32 [value] // u64 which would increase the message size 2x but allow to ID the stats from 0, saving strset space as well as allow seamless adding of legacy stats to this API (which are IDed from 0). On user space side we can re-use -S, and make it dump standard stats if --groups are defined. $ ethtool -S eth0 --groups eth-phy eth-mac rmon eth-ctrl Stats for eth0: eth-phy-SymbolErrorDuringCarrier: 0 eth-mac-FramesTransmittedOK: 0 eth-mac-FrameTooLongErrors: 0 eth-ctrl-MACControlFramesTransmitted: 0 eth-ctrl-MACControlFramesReceived: 1 eth-ctrl-UnsupportedOpcodesReceived: 0 rmon-etherStatsUndersizePkts: 0 rmon-etherStatsJabbers: 0 rmon-rx-etherStatsPkts64Octets: 1 rmon-rx-etherStatsPkts128to255Octets: 0 rmon-rx-etherStatsPkts1024toMaxOctets: 1 rmon-tx-etherStatsPkts64Octets: 1 rmon-tx-etherStatsPkts128to255Octets: 0 rmon-tx-etherStatsPkts1024toMaxOctets: 1 Jakub Kicinski (6): docs: networking: extend the statistics documentation docs: ethtool: document standard statistics ethtool: add a new command for reading standard stats ethtool: add interface to read standard MAC stats ethtool: add interface to read standard MAC Ctrl stats ethtool: add interface to read RMON stats Documentation/networking/ethtool-netlink.rst | 74 ++++ Documentation/networking/statistics.rst | 44 ++- include/linux/ethtool.h | 95 +++++ include/uapi/linux/ethtool.h | 10 + include/uapi/linux/ethtool_netlink.h | 134 +++++++ net/ethtool/Makefile | 2 +- net/ethtool/netlink.c | 10 + net/ethtool/netlink.h | 8 + net/ethtool/stats.c | 374 +++++++++++++++++++ net/ethtool/strset.c | 25 ++ 10 files changed, 773 insertions(+), 3 deletions(-) create mode 100644 net/ethtool/stats.c -- 2.30.2