Re: [PATCH net-next] net: sfp: Add quirk for Dell M14MK module

[Andrew Lunn <andrew@lunn.ch>]

On Fri, Aug 07, 2026 at 09:30:25PM +0000, Xander Wilmink wrote:
> Greetings,
> 
> This adds an quirk for the Dell M14MK (S28-10G-25G-SR-85C) SFP28 module.
> These are short range fiber modules, and should advertise 10000baseSR/Full.
> Incorrectly these advertise as being a copper module: 10000baseCR/Full. 
> The link fails to come up, and the kernel logs "unsupported SFP module: 
> no common interface modes."
> With the quirk added, the 10Gbit/s link comes up.
> 
> Tested on a Linksys LGS328PC with OpenWRT SNAPSHOT version:
> OpenWrt SNAPSHOT r35298-2a73f02e56 / LuCI Master 26.190.71895~a18dc50.
> Ethtool advertises now "10000baseSR/Full" and the link works on 10Gbit/s.
> 
> Thank you for your time.
> 
> Kind regards,
> 
> Xander Wilmink

The commit message should be formal, since it becomes part of the
Linux kernel. Please remove the Greetings, Thanks, Kind regards etc.

> +static void sfp_quirk_25g_10g_dual(const struct sfp_eeprom_id *id,
> +				   struct sfp_module_caps *caps)
> +{
> +	linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
> +			 caps->link_modes);
> +	__set_bit(PHY_INTERFACE_MODE_10GBASER, caps->interfaces);

Do you need to clear 10000baseCR/Full here?

Does it get the 25G part correct? The quirk itself is only touching
10G, so the _25g_ in the name seems irrelevant.

    Andrew

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