netdev - [PATCH v4 net-next 6/9] net: phy: Immediately call adjust_link if only tx_lpi

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Message-Id: <20230618184119.4017149-7-andrew@lunn.ch>
Date: Sun, 18 Jun 2023 20:41:16 +0200
From: Andrew Lunn <andrew@...n.ch>
To: netdev <netdev@...r.kernel.org>
Cc: Russell King <rmk+kernel@...linux.org.uk>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Oleksij Rempel <linux@...pel-privat.de>,
	Andrew Lunn <andrew@...n.ch>
Subject: [PATCH v4 net-next 6/9] net: phy: Immediately call adjust_link if only tx_lpi_enabled changes

The MAC driver changes its EEE hardware configuration in its
adjust_link callback. This is called when auto-neg
completes. Disabling EEE via eee_enabled false will trigger an
autoneg, and as a result the adjust_link callback will be called with
phydev->enable_tx_lpi set to false. Similarly, eee_enabled set to true
and with a change of advertised link modes will result in a new
autoneg, and a call the adjust_link call.

If set_eee is called with only a change to tx_lpi_enabled which does
not trigger an auto-neg, it is necessary to call the adjust_link
callback so that the MAC is reconfigured to take this change into
account.

When setting phydev->enable_tx_lpi, take both eee_enabled and
tx_lpi_enabled into account, so the MAC drivers just needs to act on
phydev->enable_tx_lpi and not the whole EEE configuration.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/phy/phy-c45.c | 11 ++++++++---
 drivers/net/phy/phy.c     | 25 ++++++++++++++++++++++---
 2 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index d1d7cf34ac0b..7ddae1df9254 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -1434,6 +1434,8 @@ EXPORT_SYMBOL(genphy_c45_ethtool_get_eee);
  * advertised, but the previously advertised link modes are
  * retained. This allows EEE to be enabled/disabled in a none
  * destructive way.
+ * Returns either error code, 0 if there was no change, or positive if
+ * there was a change which triggered auto-neg.
  */
 int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
 			       struct ethtool_eee *data)
@@ -1467,9 +1469,12 @@ int genphy_c45_ethtool_set_eee(struct phy_device *phydev,
 	ret = genphy_c45_an_config_eee_aneg(phydev);
 	if (ret < 0)
 		return ret;
-	if (ret > 0)
-		return phy_restart_aneg(phydev);
-
+	if (ret > 0) {
+		ret = phy_restart_aneg(phydev);
+		if (ret < 0)
+			return ret;
+		return 1;
+	}
 	return 0;
 }
 EXPORT_SYMBOL(genphy_c45_ethtool_set_eee);
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 48150d5626d8..830bca772f68 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -934,7 +934,8 @@ static int phy_check_link_status(struct phy_device *phydev)
 		if (err < 0)
 			phydev->enable_tx_lpi = false;
 		else
-			phydev->enable_tx_lpi = err;
+			phydev->enable_tx_lpi = (err & phydev->eee_cfg.tx_lpi_enabled);
+
 		phy_link_up(phydev);
 	} else if (!phydev->link && phydev->state != PHY_NOLINK) {
 		phydev->state = PHY_NOLINK;
@@ -1606,6 +1607,21 @@ int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data)
 }
 EXPORT_SYMBOL(phy_ethtool_get_eee);
 
+/* auto-neg not triggered, directly inform the MAC if something
+ * changed'
+ */
+static void phy_ethtool_set_eee_noneg(struct phy_device *phydev,
+				      struct ethtool_eee *data)
+{
+	if (phydev->eee_cfg.tx_lpi_enabled !=
+	    data->tx_lpi_enabled) {
+		eee_to_eeecfg(data, &phydev->eee_cfg);
+		phydev->enable_tx_lpi = eeecfg_mac_can_tx_lpi(&phydev->eee_cfg);
+		if (phydev->link)
+			phy_link_up(phydev);
+	}
+}
+
 /**
  * phy_ethtool_set_eee - set EEE supported and status
  * @phydev: target phy_device struct
@@ -1622,11 +1638,14 @@ int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data)
 
 	mutex_lock(&phydev->lock);
 	ret = genphy_c45_ethtool_set_eee(phydev, data);
-	if (!ret)
+	if (ret >= 0) {
+		if (ret == 0)
+			phy_ethtool_set_eee_noneg(phydev, data);
 		eee_to_eeecfg(data, &phydev->eee_cfg);
+	}
 	mutex_unlock(&phydev->lock);
 
-	return ret;
+	return (ret < 0 ? ret : 0);
 }
 EXPORT_SYMBOL(phy_ethtool_set_eee);
 
-- 
2.40.1