r8169: add support for returning tx_lpi_timer in ethtool get_eee

Add support for returning the tx_lpi_timer value to userspace.
This is supported by few chip versions only: RTL8168h/RTL8125/RTL8126

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/4eee9c34-c5d6-4c96-9b05-455896dea59a@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 5244f24a7cb88c225b61dddefecc753fa93add6c..7d3f6d59be8c269e412a06a7c376c4405a530517 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -2053,14 +2053,34 @@ static void rtl_set_eee_txidle_timer(struct rtl8169_private *tp)
        }
 }
 
+static unsigned int r8169_get_tx_lpi_timer_us(struct rtl8169_private *tp)
+{
+       unsigned int speed = tp->phydev->speed;
+       unsigned int timer = tp->tx_lpi_timer;
+
+       if (!timer || speed == SPEED_UNKNOWN)
+               return 0;
+
+       /* tx_lpi_timer value is in bytes */
+       return DIV_ROUND_CLOSEST(timer * BITS_PER_BYTE, speed);
+}
+
 static int rtl8169_get_eee(struct net_device *dev, struct ethtool_keee *data)
 {
        struct rtl8169_private *tp = netdev_priv(dev);
+       int ret;
 
        if (!rtl_supports_eee(tp))
                return -EOPNOTSUPP;
 
-       return phy_ethtool_get_eee(tp->phydev, data);
+       ret = phy_ethtool_get_eee(tp->phydev, data);
+       if (ret)
+               return ret;
+
+       data->tx_lpi_timer = r8169_get_tx_lpi_timer_us(tp);
+       data->tx_lpi_enabled = data->tx_lpi_timer ? data->eee_enabled : false;
+
+       return 0;
 }
 
 static int rtl8169_set_eee(struct net_device *dev, struct ethtool_keee *data)