From a21202743f9ce4063e86b99cccaef48ef9813379 Mon Sep 17 00:00:00 2001
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Date: Sun, 31 Aug 2025 18:34:43 +0100
Subject: net: phylink: disable autoneg for interfaces that have no inband

Mathew reports that as a result of commit 6561f0e547be ("net: pcs:
pcs-lynx: implement pcs_inband_caps() method"), 10G SFP modules no
longer work with the Lynx PCS.

This problem is not specific to the Lynx PCS, but is caused by commit
df874f9e52c3 ("net: phylink: add pcs_inband_caps() method") which added
validation of the autoneg state to the optical SFP configuration path.

Fix this by handling interface modes that fundamentally have no
inband negotiation more correctly - if we only have a single interface
mode, clear the Autoneg support bit and the advertising mask. If the
module can operate with several different interface modes, autoneg may
be supported for other modes, so leave the support mask alone and just
clear the Autoneg bit in the advertising mask.

This restores 10G optical module functionality with PCS that supply
their inband support, and makes ethtool output look sane.

Reported-by: Mathew McBride <matt@traverse.com.au>
Closes: https://lore.kernel.org/r/025c0ebe-5537-4fa3-b05a-8b835e5ad317@app.fastmail.com
Fixes: df874f9e52c3 ("net: phylink: add pcs_inband_caps() method")
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/E1uslwx-00000001SPB-2kiM@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/phy/phylink.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -3500,6 +3500,7 @@ static int phylink_sfp_config_optical(st
 	__ETHTOOL_DECLARE_LINK_MODE_MASK(support);
 	DECLARE_PHY_INTERFACE_MASK(interfaces);
 	struct phylink_link_state config;
+	enum inband_type inband_type;
 	phy_interface_t interface;
 	int ret;
 
@@ -3546,6 +3547,23 @@ static int phylink_sfp_config_optical(st
 	phylink_dbg(pl, "optical SFP: chosen %s interface\n",
 		    phy_modes(interface));
 
+	inband_type = phylink_get_inband_type(interface);
+	if (inband_type == INBAND_NONE) {
+		/* If this is the sole interface, and there is no inband
+		 * support, clear the advertising mask and Autoneg bit in
+		 * the support mask. Otherwise, just clear the Autoneg bit
+		 * in the advertising mask.
+		 */
+		if (phy_interface_weight(pl->sfp_interfaces) == 1) {
+			linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+					   pl->sfp_support);
+			linkmode_zero(config.advertising);
+		} else {
+			linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+					   config.advertising);
+		}
+	}
+
 	if (!phylink_validate_pcs_inband_autoneg(pl, interface,
 						 config.advertising)) {
 		phylink_err(pl, "autoneg setting not compatible with PCS");
