[v4,net-next,0/4] Add ethtool interface for SyncE

Synchronous Ethernet networks use a physical layer clock to syntonize
the frequency across different network elements.

Basic SyncE node defined in the ITU-T G.8264 consist of an Ethernet
Equipment Clock (EEC) and have the ability to recover synchronization
from the synchronization inputs - either traffic interfaces or external
frequency sources.
The EEC can synchronize its frequency (syntonize) to any of those sources.
It is also able to select synchronization source through priority tables
and synchronization status messaging. It also provides neccessary
filtering and holdover capabilities

This patch series introduces basic interface for reading and configuring
recover clocks on a SyncE capable device

v4:
- Dropped EEC_STATE reporting (TBD: DPLL subsystem)
- moved recovered clock configuration to ethtool netlink

v3:
- remove RTM_GETRCLKRANGE
- return state of all possible pins in the RTM_GETRCLKSTATE
- clarify documentation

v2:
- improved documentation
- fixed kdoc warning

RFC history:
v2:
- removed whitespace changes
- fix issues reported by test robot
v3:
- Changed naming from SyncE to EEC
- Clarify cover letter and commit message for patch 1
v4:
- Removed sync_source and pin_idx info
- Changed one structure to attributes
- Added EEC_SRC_PORT flag to indicate that the EEC is synchronized
  to the recovered clock of a port that returns the state
v5:
- add EEC source as an optiona attribute
- implement support for recovered clocks
- align states returned by EEC to ITU-T G.781
v6:
- fix EEC clock state reporting
- add documentation
- fix descriptions in code comments

Maciej Machnikowski (4):
  ice: add support detecting features based on netlist
  ethtool: Add ability to configure recovered clock for SyncE feature
  ice: add support for monitoring SyncE DPLL state
  ice: add support for SyncE recovered clocks

 Documentation/networking/ethtool-netlink.rst  |  67 +++++
 drivers/net/ethernet/intel/ice/ice.h          |   7 +
 .../net/ethernet/intel/ice/ice_adminq_cmd.h   |  70 ++++-
 drivers/net/ethernet/intel/ice/ice_common.c   | 224 +++++++++++++++
 drivers/net/ethernet/intel/ice/ice_common.h   |  20 +-
 drivers/net/ethernet/intel/ice/ice_devids.h   |   3 +
 drivers/net/ethernet/intel/ice/ice_ethtool.c  |  97 +++++++
 drivers/net/ethernet/intel/ice/ice_lib.c      |   6 +-
 drivers/net/ethernet/intel/ice/ice_ptp.c      |  35 +++
 drivers/net/ethernet/intel/ice/ice_ptp_hw.c   |  49 ++++
 drivers/net/ethernet/intel/ice/ice_ptp_hw.h   |  36 +++
 drivers/net/ethernet/intel/ice/ice_type.h     |   1 +
 include/linux/ethtool.h                       |   9 +
 include/uapi/linux/ethtool_netlink.h          |  21 ++
 net/ethtool/Makefile                          |   3 +-
 net/ethtool/netlink.c                         |  20 ++
 net/ethtool/netlink.h                         |   4 +
 net/ethtool/synce.c                           | 267 ++++++++++++++++++
 18 files changed, 935 insertions(+), 4 deletions(-)
 create mode 100644 net/ethtool/synce.c