linux-kernel - Re: [PATCH net-next v5 0/5] ethtool: introduce PHY MSE diagnostics UAPI and drivers

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Message-ID: <20250911191846.273bc7db@kernel.org>
Date: Thu, 11 Sep 2025 19:18:46 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon
 Horman <horms@...nel.org>, Donald Hunter <donald.hunter@...il.com>,
 Jonathan Corbet <corbet@....net>, Heiner Kallweit <hkallweit1@...il.com>,
 Russell King <linux@...linux.org.uk>, Kory Maincent
 <kory.maincent@...tlin.com>, Maxime Chevallier
 <maxime.chevallier@...tlin.com>, Nishanth Menon <nm@...com>,
 kernel@...gutronix.de, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, UNGLinuxDriver@...rochip.com,
 linux-doc@...r.kernel.org, Michal Kubecek <mkubecek@...e.cz>, Roan van Dijk
 <roan@...tonic.nl>
Subject: Re: [PATCH net-next v5 0/5] ethtool: introduce PHY MSE diagnostics
 UAPI and drivers

On Mon,  8 Sep 2025 14:46:05 +0200 Oleksij Rempel wrote:
>  In practice, such scenarios can only be investigated in
> fixed-link mode; here, MSE can provide an empirically estimated value
> indicating conditions under which autonegotiation would not succeed.

Does fixed-link make sense here? I thought fixed-link meant MAC-to-MAC
in most contexts