netdev - Re: Aquantia PHY in OCSGMII mode?

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Message-ID: <aK7J7kOltB/IiYUd@FUE-ALEWI-WINX>
Date: Wed, 27 Aug 2025 11:03:42 +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 Wed, Aug 27, 2025 at 09:47:49AM +0100 schrieb Russell King (Oracle):
> On Wed, Aug 27, 2025 at 10:41:11AM +0200, Alexander Wilhelm wrote:
> > Set to 100M:
> > 
> >     fsl_dpaa_mac: [DEBUG] <memac_link_down> called
> >     fsl_dpaa_mac: [DEBUG] <memac_link_up> called
> >     fsl_dpaa_mac: [DEBUG] * mode: 0
> >     fsl_dpaa_mac: [DEBUG] * phy_mode(interface): 2500base-x
> >     fsl_dpaa_mac: [DEBUG] * memac_if_mode: 00000002 (IF_MODE_GMII)
> >     fsl_dpaa_mac: [DEBUG] * speed: 2500
> >     fsl_dpaa_mac: [DEBUG] * duplex: 1
> >     fsl_dpaa_mac: [DEBUG] * tx_pause: 1
> >     fsl_dpaa_mac: [DEBUG] * rx_pause: 1
> 
> So the PHY reported that it's using 2500base-X ("OCSGMII") for 100M,
> which means 0x31b 3 LSBs are 4. Your hardware engineer appears to be
> incorrect in his statement.

I asked the hardware engineer again. The point is that the MAC does not set
SGMII for 100M. It still uses 2500base-x but with 10x paket repetition. He could
measure and proof that with a logic analyzer.


Best regards
Alexander Wilhelm