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

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Date:   Mon, 27 Jul 2020 18:27:00 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     "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>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "olteanv@...il.com" <olteanv@...il.com>
Subject: RE: [PATCH net-next v4 0/5] net: phy: add Lynx PCS MDIO module

> Subject: [PATCH net-next v4 0/5] net: phy: add Lynx PCS MDIO module
> 
> 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.
> 

Any feedback on the use of phylink_pcs?

Thanks,
Ioana

> 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 +++++++++++++++++++
>  drivers/net/phy/phylink.c                |  44 +++
>  include/linux/mdio.h                     |   6 +
>  include/linux/pcs-lynx.h                 |  21 ++
>  include/linux/phylink.h                  |   3 +
>  13 files changed, 442 insertions(+), 404 deletions(-)  create mode 100644
> drivers/net/phy/pcs-lynx.c  create mode 100644 include/linux/pcs-lynx.h
> 
> --
> 2.25.1