net: stmmac: Modify configuration method of EEE timers

Ethtool manual stated that the tx-timer is the "the amount of time the
device should stay in idle mode prior to asserting its Tx LPI". The
previous implementation for "ethtool --set-eee tx-timer" sets the LPI TW
timer duration which is not correct. Hence, this patch fixes the
"ethtool --set-eee tx-timer" to configure the EEE LPI timer.

The LPI TW Timer will be using the defined default value instead of
"ethtool --set-eee tx-timer" which follows the EEE LS timer implementation.

Changelog V2
*Not removing/modifying the eee_timer.
*EEE LPI timer can be configured through ethtool and also the eee_timer
module param.
*EEE TW Timer will be configured with default value only, not able to be
configured through ethtool or module param. This follows the implementation
of the EEE LS Timer.

Fixes: d765955d2ae0 ("stmmac: add the Energy Efficient Ethernet support")
Signed-off-by: Vineetha G. Jaya Kumaran <[e-mail]>
Signed-off-by: Voon Weifeng <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/stmicro/stmmac/stmmac.h

···
 	int eee_enabled;
 	int eee_active;
 	int tx_lpi_timer;
+	int tx_lpi_enabled;
+	int eee_tw_timer;
 	unsigned int mode;
 	unsigned int chain_mode;
 	int extend_desc;

drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c

···
 	edata->eee_enabled = priv->eee_enabled;
 	edata->eee_active = priv->eee_active;
 	edata->tx_lpi_timer = priv->tx_lpi_timer;
+	edata->tx_lpi_enabled = priv->tx_lpi_enabled;
 
 	return phylink_ethtool_get_eee(priv->phylink, edata);
 }
···
 	if (!priv->dma_cap.eee)
 		return -EOPNOTSUPP;
 
+	if (priv->tx_lpi_enabled != edata->tx_lpi_enabled)
+		netdev_warn(priv->dev,
+			    "Setting EEE tx-lpi is not supported\n");
+
 	if (!edata->eee_enabled)
 		stmmac_disable_eee_mode(priv);
 
···
 	if (ret)
 		return ret;
 
-	priv->tx_lpi_timer = edata->tx_lpi_timer;
+	if (edata->eee_enabled &&
+	    priv->tx_lpi_timer != edata->tx_lpi_timer) {
+		priv->tx_lpi_timer = edata->tx_lpi_timer;
+		stmmac_eee_init(priv);
+	}
+
 	return 0;
 }
 

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

···
 static int eee_timer = STMMAC_DEFAULT_LPI_TIMER;
 module_param(eee_timer, int, 0644);
 MODULE_PARM_DESC(eee_timer, "LPI tx expiration time in msec");
-#define STMMAC_LPI_T(x) (jiffies + msecs_to_jiffies(x))
+#define STMMAC_LPI_T(x) (jiffies + usecs_to_jiffies(x))
 
 /* By default the driver will use the ring mode to manage tx and rx descriptors,
  * but allow user to force to use the chain instead of the ring
···
 	struct stmmac_priv *priv = from_timer(priv, t, eee_ctrl_timer);
 
 	stmmac_enable_eee_mode(priv);
-	mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(eee_timer));
+	mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
 }
 
 /**
···
  */
 bool stmmac_eee_init(struct stmmac_priv *priv)
 {
-	int tx_lpi_timer = priv->tx_lpi_timer;
+	int eee_tw_timer = priv->eee_tw_timer;
 
 	/* Using PCS we cannot dial with the phy registers at this stage
 	 * so we do not support extra feature like EEE.
···
 		if (priv->eee_enabled) {
 			netdev_dbg(priv->dev, "disable EEE\n");
 			del_timer_sync(&priv->eee_ctrl_timer);
-			stmmac_set_eee_timer(priv, priv->hw, 0, tx_lpi_timer);
+			stmmac_set_eee_timer(priv, priv->hw, 0, eee_tw_timer);
 		}
 		mutex_unlock(&priv->lock);
 		return false;
···
 
 	if (priv->eee_active && !priv->eee_enabled) {
 		timer_setup(&priv->eee_ctrl_timer, stmmac_eee_ctrl_timer, 0);
-		mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(eee_timer));
 		stmmac_set_eee_timer(priv, priv->hw, STMMAC_DEFAULT_LIT_LS,
-				     tx_lpi_timer);
+				     eee_tw_timer);
 	}
+
+	mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
 
 	mutex_unlock(&priv->lock);
 	netdev_dbg(priv->dev, "Energy-Efficient Ethernet initialized\n");
···
 
 	stmmac_mac_set(priv, priv->ioaddr, false);
 	priv->eee_active = false;
+	priv->tx_lpi_enabled = false;
 	stmmac_eee_init(priv);
 	stmmac_set_eee_pls(priv, priv->hw, false);
 }
···
 	if (phy && priv->dma_cap.eee) {
 		priv->eee_active = phy_init_eee(phy, 1) >= 0;
 		priv->eee_enabled = stmmac_eee_init(priv);
+		priv->tx_lpi_enabled = priv->eee_enabled;
 		stmmac_set_eee_pls(priv, priv->hw, true);
 	}
 }
···
 
 	if ((priv->eee_enabled) && (!priv->tx_path_in_lpi_mode)) {
 		stmmac_enable_eee_mode(priv);
-		mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(eee_timer));
+		mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
 	}
 
 	/* We still have pending packets, let's call for a new scheduling */
···
 			netdev_warn(priv->dev, "PTP init failed\n");
 	}
 
-	priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
+	priv->eee_tw_timer = STMMAC_DEFAULT_TWT_LS;
+
+	/* Convert the timer from msec to usec */
+	if (!priv->tx_lpi_timer)
+		priv->tx_lpi_timer = eee_timer * 1000;
 
 	if (priv->use_riwt) {
 		if (!priv->rx_riwt)