linux-kernel - [PATCH net-next 01/13] net: phy: phy_port: Correctly recompute the port's linkmodes

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Message-ID: <20260127134202.8208-2-maxime.chevallier@bootlin.com>
Date: Tue, 27 Jan 2026 14:41:49 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: davem@...emloft.net,
	Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Russell King <linux@...linux.org.uk>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	thomas.petazzoni@...tlin.com,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Herve Codina <herve.codina@...tlin.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Köry Maincent <kory.maincent@...tlin.com>,
	Marek Behún <kabel@...nel.org>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Nicolò Veronese <nicveronese@...il.com>,
	Simon Horman <horms@...nel.org>,
	mwojtas@...omium.org,
	Romain Gantois <romain.gantois@...tlin.com>,
	Daniel Golle <daniel@...rotopia.org>,
	Dimitri Fedrau <dimitri.fedrau@...bherr.com>
Subject: [PATCH net-next 01/13] net: phy: phy_port: Correctly recompute the port's linkmodes

a PHY-driven phy_port contains a 'supported' field containing the
linkmodes available on this port. This is populated based on :
 - The PHY's reported features
 - The DT representation of the connector
 - The PHY's attach_mdi() callback

As these different attrbutin methods work in conjunction, the helper
phy_port_update_supported() recomputes the final 'supported' value based
on the populated mediums, linkmodes and pairs.

However this recompute wasn't correctly implemented, and added more
modes than necessary by or'ing the medium-specific modes to the existing
support. Let's fix this and properly filter the modes.

Fixes: 589e934d2735 ("net: phy: Introduce PHY ports representation")
Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
---
 drivers/net/phy/phy_port.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/phy_port.c b/drivers/net/phy/phy_port.c
index ec93c8ca051e..68a0068220ed 100644
--- a/drivers/net/phy/phy_port.c
+++ b/drivers/net/phy/phy_port.c
@@ -118,11 +118,14 @@ void phy_port_update_supported(struct phy_port *port)
 	int i;
 
 	for_each_set_bit(i, &port->mediums, __ETHTOOL_LINK_MEDIUM_LAST) {
-		linkmode_zero(supported);
-		phy_caps_medium_get_supported(supported, i, port->pairs);
-		linkmode_or(port->supported, port->supported, supported);
+		__ETHTOOL_DECLARE_LINK_MODE_MASK(med_supported) = {0};
+
+		phy_caps_medium_get_supported(med_supported, i, port->pairs);
+		linkmode_or(supported, supported, med_supported);
 	}
 
+	linkmode_and(port->supported, port->supported, supported);
+
 	/* If there's no pairs specified, we grab the default number of
 	 * pairs as the max of the default pairs for each linkmode
 	 */
-- 
2.49.0