linux-kernel - [PATCH net-next 07/13] net: phy: phy_caps: Move __set_linkmode_max_speed to phy

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Message-ID: <20250222142727.894124-8-maxime.chevallier@bootlin.com>
Date: Sat, 22 Feb 2025 15:27:19 +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,
	linux-arm-kernel@...ts.infradead.org,
	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>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Simon Horman <horms@...nel.org>,
	Romain Gantois <romain.gantois@...tlin.com>
Subject: [PATCH net-next 07/13] net: phy: phy_caps: Move __set_linkmode_max_speed to phy_caps

Convert the __set_linkmode_max_speed to use the link_capabilities array.
This makes it easy to clamp the linkmodes to a given max speed.
Introduce a new helper phy_caps_linkmode_max_speed to replace the
previous one that used phy_settings.

Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
---
 drivers/net/phy/phy-caps.h |  2 ++
 drivers/net/phy/phy-core.c | 19 ++++---------------
 drivers/net/phy/phy_caps.c | 16 ++++++++++++++++
 3 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/drivers/net/phy/phy-caps.h b/drivers/net/phy/phy-caps.h
index d4cd91fd0911..55d83661fa18 100644
--- a/drivers/net/phy/phy-caps.h
+++ b/drivers/net/phy/phy-caps.h
@@ -23,5 +23,7 @@ int phy_interface_max_speed(phy_interface_t interface);
 
 size_t phy_caps_speeds(unsigned int *speeds, size_t size,
 		       unsigned long *linkmodes);
+void phy_caps_linkmode_max_speed(u32 max_speed, unsigned long *linkmodes);
+
 
 #endif /* __PHY_CAPS_H */
diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
index e2850d6fe158..300d47d4fd3c 100644
--- a/drivers/net/phy/phy-core.c
+++ b/drivers/net/phy/phy-core.c
@@ -6,6 +6,8 @@
 #include <linux/phy.h>
 #include <linux/of.h>
 
+#include "phy-caps.h"
+
 /**
  * phy_speed_to_str - Return a string representing the PHY link speed
  *
@@ -337,22 +339,9 @@ phy_lookup_setting(int speed, int duplex, const unsigned long *mask, bool exact)
 }
 EXPORT_SYMBOL_GPL(phy_lookup_setting);
 
-static void __set_linkmode_max_speed(u32 max_speed, unsigned long *addr)
-{
-	const struct phy_setting *p;
-	int i;
-
-	for (i = 0, p = settings; i < ARRAY_SIZE(settings); i++, p++) {
-		if (p->speed > max_speed)
-			linkmode_clear_bit(p->bit, addr);
-		else
-			break;
-	}
-}
-
 static void __set_phy_supported(struct phy_device *phydev, u32 max_speed)
 {
-	__set_linkmode_max_speed(max_speed, phydev->supported);
+	phy_caps_linkmode_max_speed(max_speed, phydev->supported);
 }
 
 /**
@@ -556,7 +545,7 @@ int phy_speed_down_core(struct phy_device *phydev)
 	if (min_common_speed == SPEED_UNKNOWN)
 		return -EINVAL;
 
-	__set_linkmode_max_speed(min_common_speed, phydev->advertising);
+	phy_caps_linkmode_max_speed(min_common_speed, phydev->advertising);
 
 	return 0;
 }
diff --git a/drivers/net/phy/phy_caps.c b/drivers/net/phy/phy_caps.c
index ee8aa1217a6e..cb7a5fa177b1 100644
--- a/drivers/net/phy/phy_caps.c
+++ b/drivers/net/phy/phy_caps.c
@@ -129,6 +129,22 @@ size_t phy_caps_speeds(unsigned int *speeds, size_t size,
 	return count;
 }
 
+/**
+ * phy_caps_linkmode_max_speed() - Clamp a linkmodes set to a max speed
+ * @max_speed: Speed limit for the linkmode set
+ * @linkmodes: Linkmodes to limit
+ */
+void phy_caps_linkmode_max_speed(u32 max_speed, unsigned long *linkmodes)
+{
+	int capa;
+
+	for (capa = __LINK_CAPA_LAST; capa >= 0; capa--)
+		if (link_caps[capa].speed > max_speed)
+			linkmode_andnot(linkmodes, linkmodes, link_caps[capa].linkmodes);
+		else
+			break;
+}
+
 /**
  * linkmode_from_caps() - Convert capabilities to ethtool link modes
  * @linkmodes: ethtool linkmode mask (must be already initialised)
-- 
2.48.1