netdev - RE: [PATCH net-next v4 0/5] net: phy: add Lynx PCS MDIO module

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Date:   Mon, 27 Jul 2020 18:48:58 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Vladimir Oltean <vladimir.oltean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandru Marginean <alexandru.marginean@....com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "olteanv@...il.com" <olteanv@...il.com>
Subject: RE: [PATCH net-next v4 0/5] net: phy: add Lynx PCS MDIO module

> Subject: Re: [PATCH net-next v4 0/5] net: phy: add Lynx PCS MDIO module
> 
> 
> 
> On 7/24/2020 1:01 AM, Ioana Ciornei wrote:
> > Add support for the Lynx PCS as a separate module in drivers/net/phy/.
> > The advantage of this structure is that multiple ethernet or switch
> > drivers used on NXP hardware (ENETC, Seville, Felix DSA switch etc)
> > can share the same implementation of PCS configuration and runtime
> > management.
> >
> > The module implements phylink_pcs_ops and exports a phylink_pcs
> > (incorporated into a lynx_pcs) which can be directly passed to phylink
> > through phylink_pcs_set.
> >
> > The first 3 patches add some missing pieces in phylink and the locked
> > mdiobus write accessor. Next, the Lynx PCS MDIO module is added as a
> > standalone module. The majority of the code is extracted from the
> > Felix DSA driver. The last patch makes the necessary changes in the
> > Felix and Seville drivers in order to use the new common PCS implementation.
> >
> > At the moment, USXGMII (only with in-band AN), SGMII, QSGMII (with and
> > without in-band AN) and 2500Base-X (only w/o in-band AN) are supported
> > by the Lynx PCS MDIO module since these were also supported by Felix
> > and no functional change is intended at this time.
> >
> > Changes in v2:
> >  * got rid of the mdio_lynx_pcs structure and directly exported the
> > functions without the need of an indirection
> >  * made the necessary adjustments for this in the Felix DSA driver
> >  * solved the broken allmodconfig build test by making the module
> > tristate instead of bool
> >  * fixed a memory leakage in the Felix driver (the pcs structure was
> > allocated twice)
> >
> > Changes in v3:
> >  * added support for PHYLINK PCS ops in DSA (patch 5/9)
> >  * cleanup in Felix PHYLINK operations and migrate to
> >  phylink_mac_link_up() being the callback of choice for applying MAC
> > configuration (patches 6-8)
> >
> > Changes in v4:
> >  * use the newly introduced phylink PCS mechanism
> >  * install the phylink_pcs in the phylink_mac_config DSA ops
> >  * remove the direct implementations of the PCS ops
> >  * do no use the SGMII_ prefix when referring to the IF_MORE register
> >  * add a phylink helper to decode the USXGMII code word
> >  * remove cleanup patches for Felix (these have been already accepted)
> >  * Seville (recently introduced) now has PCS support through the same
> > Lynx PCS module
> >
> > Ioana Ciornei (5):
> >   net: phylink: add helper function to decode USXGMII word
> >   net: phylink: consider QSGMII interface mode in
> >     phylink_mii_c22_pcs_get_state
> >   net: mdiobus: add clause 45 mdiobus write accessor
> >   net: phy: add Lynx PCS module
> >   net: dsa: ocelot: use the Lynx PCS helpers in Felix and Seville
> >
> >  MAINTAINERS                              |   7 +
> >  drivers/net/dsa/ocelot/Kconfig           |   1 +
> >  drivers/net/dsa/ocelot/felix.c           |  28 +-
> >  drivers/net/dsa/ocelot/felix.h           |  20 +-
> >  drivers/net/dsa/ocelot/felix_vsc9959.c   | 374 ++---------------------
> >  drivers/net/dsa/ocelot/seville_vsc9953.c |  21 +-
> >  drivers/net/phy/Kconfig                  |   6 +
> >  drivers/net/phy/Makefile                 |   1 +
> >  drivers/net/phy/pcs-lynx.c               | 314 +++++++++++++++++++
> 
> I believe Andrew had a plan to create a better organization within
> drivers/net/phy, while this happens, maybe you can already create
> drivers/net/phy/pcs/ regardless of the state of Andrew's work?
> 

I got the impression from Andrew that the plan was to do this at a later stage
together with the Synopsys XPCS. I could certainly do what you say, I am just
not very keen to add such things into this patch set. 

Ioana

> >  drivers/net/phy/phylink.c                |  44 +++
> >  include/linux/mdio.h                     |   6 +
> >  include/linux/pcs-lynx.h                 |  21 ++
> 
> And likewise for this header.
> --
> Florian