linux-kernel - Re: [PATCH RFC net-next v2 2/2] net: sfp: support 25G long-range modules (extended compliance code 0x3)

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Message-ID: <aVe-hq6yZfdKTT20@shell.armlinux.org.uk>
Date: Fri, 2 Jan 2026 12:48:06 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Josua Mayer <josua@...id-run.com>
Cc: 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: [PATCH RFC net-next v2 2/2] net: sfp: support 25G long-range
 modules (extended compliance code 0x3)

On Thu, Jan 01, 2026 at 06:05:39PM +0200, Josua Mayer wrote:
> The extended compliance code value SFF8024_ECC_100GBASE_ER4_25GBASE_ER
> (0x3) means either 4-lane 100G or single lane 25G.
> 
> Set 25000baseSR_Full mode supported in addition to the already set
> 100000baseLR4_ER4_Full.
> 
> This is slightly wrong considering 25000baseSR_Full is short-range but
> the compliance code means long range.
> 
> Unfortunately ethtool.h does not (currently) provide a bit for 25G
> long-range modules.
> Should it be added?
> Are there any reasons to not have long-range variants?

Good questions, not something I can answer though.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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