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                   | 171 ++++++++++++
 drivers/net/phy/phy-c45.c                    | 183 ++++++++++++
 drivers/net/phy/phy-core.c                   |   5 +-
 drivers/net/phy/phy.c                        | 172 ++++++++++++
 drivers/net/phy/phy_device.c                 |  17 ++
 drivers/net/phy/phylink.c                    |   6 +-
 include/linux/ethtool.h                      |  12 +
 include/linux/phy.h                          |  83 ++++++
 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                           | 276 +++++++++++++++++++
 20 files changed, 1201 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

On Sat, 17 Dec 2022 01:48:09 +0100 Piergiorgio Beruto wrote:
> 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.

# Form letter - net-next is closed

We have already submitted the networking pull request to Linus
for v6.2 and therefore net-next is closed for new drivers, features,
code refactoring and optimizations. We are currently accepting
bug fixes only.

Please repost when net-next reopens after Jan 2nd.

RFC patches sent for review only are obviously welcome at any time.

On Fri, Dec 16, 2022 at 08:45:38PM -0800, Jakub Kicinski wrote:
> On Sat, 17 Dec 2022 01:48:09 +0100 Piergiorgio Beruto wrote:
> > 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.
> 
> # Form letter - net-next is closed
> 
> We have already submitted the networking pull request to Linus
> for v6.2 and therefore net-next is closed for new drivers, features,
> code refactoring and optimizations. We are currently accepting
> bug fixes only.
> 
> Please repost when net-next reopens after Jan 2nd.
> 
> RFC patches sent for review only are obviously welcome at any time.
Hello Jakub, sorry for asking dumb questions, but what exactly "RFC"
means? I understand you cannot accept new submissions at this time, but
does this means the patchset I just submitted can still be reviewd so
they are ready for integration on Jan 2nd?

Thanks,
Piergiorgio

On Sat, 17 Dec 2022 11:10:47 +0100 Piergiorgio Beruto wrote:
> > # Form letter - net-next is closed
> > 
> > We have already submitted the networking pull request to Linus
> > for v6.2 and therefore net-next is closed for new drivers, features,
> > code refactoring and optimizations. We are currently accepting
> > bug fixes only.
> > 
> > Please repost when net-next reopens after Jan 2nd.
> > 
> > RFC patches sent for review only are obviously welcome at any time.  
>
> Hello Jakub, sorry for asking dumb questions, but what exactly "RFC"
> means? I understand you cannot accept new submissions at this time, but
> does this means the patchset I just submitted can still be reviewd so
> they are ready for integration on Jan 2nd?

Yes, exactly. You can keep posting new versions, to get reviews and get
the code ready for merging once net-next re-opens. Once net-next
re-opens you'll need to repost (it'd be too much work for us to keep
track of all "pending" work during the shutdown).

By the RFC I mean - change the [PATCH net-next] to [RFC net-next] or
[PATCH RFC net-next] if you post during shutdown, so that we know that
you know that the patches can't be merged _right now_.