linux-kernel - Re: [PATCH RFC net-next] net: phylink: always config mac for (delayed) phy

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Message-ID: <a5beb529-5769-4310-b6a4-0ddccd85caf1@lunn.ch>
Date: Tue, 7 Jan 2025 14:26:32 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Daniel Golle <daniel@...rotopia.org>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>,
	Eric Woudstra <ericwouds@...il.com>,
	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>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Frank Wunderlich <frank-w@...lic-files.de>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, bridge@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFC net-next] net: phylink: always config mac for
 (delayed) phy

> The PCS doesn't support in-band status in 2500Base-X mode, or at least
> the implementation isn't compatible with those RealTek PHYs.

Is one or the other not actually 2500Base-X, but SGMII over clocked?

Overclocked SGMII cannot do in-band signalling. It could well be the
PCS is 2500BaseX, but the PHY is over clocked SGMII, and so the PCS is
not seeing the in-band signalling it expects, so never reports link.

	Andrew