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

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Message-Id: <20260118-sfp-25g-lr-v1-2-2daf48ffae7f@solid-run.com>
Date: Sun, 18 Jan 2026 16:07:38 +0200
From: Josua Mayer <josua@...id-run.com>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 Russell King <linux@...linux.org.uk>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Simon Horman <horms@...nel.org>
Cc: Mikhail Anikin <mikhail.anikin@...id-run.com>,
 Rabeeh Khoury <rabeeh@...id-run.com>,
 Yazan Shhady <yazan.shhady@...id-run.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, Josua Mayer <josua@...id-run.com>
Subject: [PATCH 2/2] net: sfp: support 25G long-range modules (extended
 compliance code 0x3)

The extended compliance code value SFF8024_ECC_100GBASE_ER4_25GBASE_ER
(0x3) means either 4-lane 100G or single lane 25G.

Set 25000baseLR_Full mode supported in addition to the already set
100000baseLR4_ER4_Full, and handle it in sfp_select_interface.

This fixes detection of 25G capability for two SFP fiber modules:

- GigaLight GSS-SPO250-LRT
- FS SFP-25G23-BX20-I

Signed-off-by: Josua Mayer <josua@...id-run.com>
---
 drivers/net/phy/sfp-bus.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index b945d75966d5..2caa0e0c4ec8 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -247,6 +247,7 @@ static void sfp_module_parse_support(struct sfp_bus *bus,
 	case SFF8024_ECC_100GBASE_LR4_25GBASE_LR:
 	case SFF8024_ECC_100GBASE_ER4_25GBASE_ER:
 		phylink_set(modes, 100000baseLR4_ER4_Full);
+		phylink_set(modes, 25000baseLR_Full);
 		break;
 	case SFF8024_ECC_100GBASE_CR4:
 		phylink_set(modes, 100000baseCR4_Full);
@@ -342,7 +343,8 @@ phy_interface_t sfp_select_interface(struct sfp_bus *bus,
 {
 	if (phylink_test(link_modes, 25000baseCR_Full) ||
 	    phylink_test(link_modes, 25000baseKR_Full) ||
-	    phylink_test(link_modes, 25000baseSR_Full))
+	    phylink_test(link_modes, 25000baseSR_Full) ||
+	    phylink_test(link_modes, 25000baseLR_Full))
 		return PHY_INTERFACE_MODE_25GBASER;

 	if (phylink_test(link_modes, 10000baseCR_Full) ||

-- 
2.43.0