linux-kernel - Re: [PATCH net-next v12 09/18] net: ethernet: mtk_eth_soc: Fix link status for none-SGMII modes

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Message-ID: <ZAiA/ExxgHPEY15h@shell.armlinux.org.uk>
Date:   Wed, 8 Mar 2023 12:35:08 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Heiner Kallweit <hkallweit1@...il.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        John Crispin <john@...ozen.org>, Felix Fietkau <nbd@....name>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        DENG Qingfang <dqfext@...il.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Vladimir Oltean <olteanv@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Jianhui Zhao <zhaojh329@...il.com>,
        Bjørn Mork <bjorn@...k.no>,
        Alexander Couzens <lynxis@...0.eu>
Subject: Re: [PATCH net-next v12 09/18] net: ethernet: mtk_eth_soc: Fix link
 status for none-SGMII modes

On Wed, Mar 08, 2023 at 12:44:57PM +0100, Frank Wunderlich wrote:
> Am 8. März 2023 12:38:31 MEZ schrieb "Russell King (Oracle)" <linux@...linux.org.uk>:
> >On Tue, Mar 07, 2023 at 03:54:11PM +0000, Daniel Golle wrote:
> >> Link partner advertised link modes are not reported by the SerDes
> >> hardware if not operating in SGMII mode. Hence we cannot use
> >> phylink_mii_c22_pcs_decode_state() in this case.
> >> Implement reporting link and an_complete only and use speed according to
> >> the interface mode.
> >> 
> >> Fixes: 14a44ab0330d ("net: mtk_eth_soc: partially convert to phylink_pcs")
> >> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> >
> >This has been proven to work by Frank Wunderlich last October, so by
> >making this change, you will be regressing his setup.
> 
> Hi
> 
> My tests were done with 1 kind of 1g fibre sfp as i only have these atm...have ordered some 2g5 rj54 ones,but don't have them yet. I'm not sure if they are working with/without sgmii (1000base-X) and if they have builtin phy.

Fiber SFPs do not have a built in PHY. They merely convert the serdes
electrical waveform into light and back again, possibly with some
retiming of the received waveform, and a bit of monitoring. They're
pretty simple devices.

They certainly do not change the protocol in any way.

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