[RFC net-next 0/2] ethtool: add interface caps and PHY tests

[Shubham Das <shubham.das@intel.com>]

This series adds two new ethtool netlink commands:

1. intf-caps-get: Discovers the functional block layout of a network
   interface. Each block represents a hardware point (MAC/PHY/MODULE) at
   a specific 802.3 sublayer (RS/PCS/FEC/PMA/PMD) with its supported
   capabilities (loopback, test patterns, BERT, error injection).

2. Add ETHTOOL_MSG_PHY_TEST_GET and ETHTOOL_MSG_PHY_TEST_SET for per-block,
  per-lane PHY testing using test patterns, BERT (Bit Error Ratio Test),
  and error injection. The block_id from intf-caps-get identifies which
  hardware point to test.

The block model uses:
  - component: identifies the hardware entity (MAC, PHY, or module).
  - sublayer: identifies the 802.3 sublayer (RS, PCS, FEC, PMA, or PMD).
  - instance: identifies multiple instances of the same component, such as
    internal and external PHYs.
  - depth: identifies the host-side or line-side block within the same
    sublayer.

Prior discussion on this proposal:
https://lore.kernel.org/netdev/SN7PR11MB810923BBDEC398E860099150FF1B2

Shubham Das (2):
  ethtool: add interface capabilities query (intf-caps-get)
  ethtool: add PHY test framework (phy-test-get, phy-test-set)

 Documentation/netlink/specs/ethtool.yaml      | 211 ++++++++++++++++++
 include/linux/ethtool.h                       |  94 ++++++++
 include/linux/phy.h                           |  16 ++
 include/linux/phylink.h                       |   7 +
 .../uapi/linux/ethtool_netlink_generated.h    | 106 +++++++++
 net/ethtool/Makefile                          |   2 +-
 net/ethtool/intf_caps.c                       | 130 +++++++++++
 net/ethtool/netlink.c                         |  24 ++
 net/ethtool/netlink.h                         |  10 +
 net/ethtool/phytest.c                         | 183 +++++++++++++++
 10 files changed, 782 insertions(+), 1 deletion(-)
 create mode 100644 net/ethtool/intf_caps.c
 create mode 100644 net/ethtool/phytest.c


base-commit: 001b5d347d8ba39b2dccaefcc57967b18caec8fe
-- 
2.25.1