netdev - Re: Aquantia PHY in OCSGMII mode?

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Message-ID: <aK7GNVi8ED0YiWau@shell.armlinux.org.uk>
Date: Wed, 27 Aug 2025 09:47:49 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Alexander Wilhelm <alexander.wilhelm@...termo.com>
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?

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.

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