linux-kernel - Re: [PATCH net-next 0/8] Improvements for RealTek 2.5G Ethernet PHYs

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Date:   Thu, 11 May 2023 13:44:48 +0200
From:   Daniel Golle <daniel@...rotopia.org>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH net-next 0/8] Improvements for RealTek 2.5G Ethernet PHYs

On Thu, May 11, 2023 at 07:29:21AM +0200, Heiner Kallweit wrote:
> On 11.05.2023 00:53, Daniel Golle wrote:
> > Improve support for RealTek 2.5G Ethernet PHYs (RTL822x series).
> > The PHYs can operate with Clause-22 and Clause-45 MDIO.
> > [...]
> 
> Has this series been tested with RTL8125A/B to ensure that the internal
> PHY use case still works?

The series has been present in OpenWrt for a while now and initially
contained a bug which broke the RTL8221 PCIe RealTek NICs. It has since been
resolved and re-tested, and it seems all fine:

https://github.com/openwrt/openwrt/commit/998b9731577dedc7747dcfa412e4543dabaaa131#r110201620

I assume that quite some OpenWrt users may use RTL8125B PCIe NICs, but I
have asked in the OpenWrt forum for testing results including this series:

https://forum.openwrt.org/t/nanopi-r6s-kernel-6-1-intergration/154677/3?u=daniel

As the r8169 driver is not using phylink and uses C22 to connect to the
PHY the main difference which will affect these devices is that
genphy_soft_reset will be called as a result of
r8169_hw_phy_config->phy_init_hw->(phydrv).soft_reset

Also note the r8169 driver always sets the interface mode to either
PHY_INTERFACE_MODE_GMII or PHY_INTERFACE_MODE_MII in
r8169_phy_connect() before calling phy_connect_direct(). While this is
certainly not technically correct for the 2.5G NICs in the strict sense,
it does have the desired effect that the newly introduced function
rtl8221b_config_init() just returns without making any changes.