linux-kernel - Re: Aquantia PHY in OCSGMII mode?

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Message-ID: <aJDI8K2+kQQwH/dp@FUE-ALEWI-WINX>
Date: Mon, 4 Aug 2025 16:51:28 +0200
From: Alexander Wilhelm <alexander.wilhelm@...termo.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Vladimir Oltean <vladimir.oltean@....com>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: Aquantia PHY in OCSGMII mode?

Am Mon, Aug 04, 2025 at 03:22:50PM +0100 schrieb Russell King (Oracle):
> On Mon, Aug 04, 2025 at 03:01:44PM +0200, Alexander Wilhelm wrote:
> > Am Mon, Aug 04, 2025 at 01:01:39PM +0300 schrieb Vladimir Oltean:
> > > On Mon, Aug 04, 2025 at 08:17:47AM +0200, Alexander Wilhelm wrote:
> > > > Am Fri, Aug 01, 2025 at 04:04:20PM +0300 schrieb Vladimir Oltean:
> > > > > On Fri, Aug 01, 2025 at 01:23:44PM +0100, Russell King (Oracle) wrote:
> > > > > > It looks like memac_select_pcs() and memac_prepare() fail to
> > > > > > handle 2500BASEX despite memac_initialization() suggesting the
> > > > > > SGMII PCS supports 2500BASEX.
> > > > > 
> > > > > Thanks for pointing this out, it seems to be a regression introduced by
> > > > > commit 5d93cfcf7360 ("net: dpaa: Convert to phylink").
> > > > > 
> > > > > If there are no other volunteers, I can offer to submit a patch if
> > > > > Alexander confirms this fixes his setup.
> > > > 
> > > > I'd be happy to help by applying the patch on my system and running some tests.
> > > > Please let me know if there are any specific steps or scenarios you'd like me to
> > > > focus on.
> > > > 
> > > > Best regards
> > > > Alexander Wilhelm
> > > 
> > > Please find the attached patch.
> > [...]
> > 
> > Hi Vladimir,
> > 
> > I’ve applied the patch you provided, but it doesn’t seem to fully resolve the
> > issue -- or perhaps I’ve misconfigured something. I’m encountering the following
> > error during initialization:
> > 
> >     mdio_bus 0x0000000ffe4e7000:00: AN not supported on 3.125GHz SerDes lane
> >     fsl_dpaa_mac ffe4e6000.ethernet eth0: pcs_config failed: -EOPNOTSUPP
> 
> We're falling foul of the historic crap that 2500base-X is (802.3 were
> very very late to the party in "standardising" it, but after there were
> many different implementations with varying capabilities already on the
> market.)
> 
> aquantia_main.c needs to implement the .inband_caps() method, and
> report what its actual capabilities are for the supplied interface
> mode according to how it has been provisioned.

Good to know, thank you. I found some implementation on marvell drivers that I
could use as a reference.


Best regards
Alexander Wilhelm