netdev - Re: [PATCH net-next 0/5] add phylink support for PCS

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Message-ID: <CA+h21hoq2qkmxDFEb2QgLfrbC0PYRBHsca=0cDcGOr3txy9hsg@mail.gmail.com>
Date:   Wed, 11 Mar 2020 14:46:33 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 0/5] add phylink support for PCS

Hi Russell,

On Wed, 11 Mar 2020 at 14:09, Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
>
> Hi,
>
> This series adds support for IEEE 802.3 register set compliant PCS
> for phylink.  In order to do this, we:
>
> 1. convert the existing (unused) mii_lpa_to_ethtool_lpa_x() function
>    to a linkmode variant.
> 2. add a helper for clause 37 advertisements, supporting both the
>    1000baseX and defacto 2500baseX variants. Note that ethtool does
>    not support half duplex for either of these, and we make no effort
>    to do so.
> 3. add accessors for modifying a MDIO device register, and use them in
>    phylib, rather than duplicating the code from phylib.

Have you considered accessing the PCS as a phy_device structure, a la
drivers/net/dsa/ocelot/felix_vsc9959.c?

> 4. add support for decoding the advertisement from clause 22 compatible
>    register sets for clause 37 advertisements and SGMII advertisements.
> 5. add support for clause 45 register sets for 10GBASE-R PCS.
>
> These have been tested on the LX2160A Clearfog-CX platform.
>
>  drivers/net/phy/mdio_bus.c |  55 +++++++++++
>  drivers/net/phy/phy-core.c |  31 ------
>  drivers/net/phy/phylink.c  | 236 +++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mdio.h       |   4 +
>  include/linux/mii.h        |  57 +++++++----
>  include/linux/phy.h        |  19 ++++
>  include/linux/phylink.h    |   8 ++
>  include/uapi/linux/mii.h   |   5 +
>  8 files changed, 366 insertions(+), 49 deletions(-)
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 10.2Mbps down 587kbps up

Regards,
-Vladimir