Merge branch 'bcmgenet-flow-control'

Florian Fainelli says:

====================
net: bcmgenet: support for flow control

This patch series adds support for flow control to the GENET driver, the
first 2 patches remove superfluous code, the 3rd one does re-organize
code a little bit and the 4th one ads the support for flow control
proper.
====================

drivers/net/ethernet/broadcom/genet/bcmgenet.c

@@ -935,6 +935,48 @@ static int bcmgenet_set_coalesce(struct net_device *dev,
 	return 0;
 }
 
+static void bcmgenet_get_pauseparam(struct net_device *dev,
+				    struct ethtool_pauseparam *epause)
+{
+	struct bcmgenet_priv *priv;
+	u32 umac_cmd;
+
+	priv = netdev_priv(dev);
+
+	epause->autoneg = priv->autoneg_pause;
+
+	if (netif_carrier_ok(dev)) {
+		/* report active state when link is up */
+		umac_cmd = bcmgenet_umac_readl(priv, UMAC_CMD);
+		epause->tx_pause = !(umac_cmd & CMD_TX_PAUSE_IGNORE);
+		epause->rx_pause = !(umac_cmd & CMD_RX_PAUSE_IGNORE);
+	} else {
+		/* otherwise report stored settings */
+		epause->tx_pause = priv->tx_pause;
+		epause->rx_pause = priv->rx_pause;
+	}
+}
+
+static int bcmgenet_set_pauseparam(struct net_device *dev,
+				   struct ethtool_pauseparam *epause)
+{
+	struct bcmgenet_priv *priv = netdev_priv(dev);
+
+	if (!dev->phydev)
+		return -ENODEV;
+
+	if (!phy_validate_pause(dev->phydev, epause))
+		return -EINVAL;
+
+	priv->autoneg_pause = !!epause->autoneg;
+	priv->tx_pause = !!epause->tx_pause;
+	priv->rx_pause = !!epause->rx_pause;
+
+	bcmgenet_phy_pause_set(dev, priv->rx_pause, priv->tx_pause);
+
+	return 0;
+}
+
 /* standard ethtool support functions. */
 enum bcmgenet_stat_type {
 	BCMGENET_STAT_NETDEV = -1,
@@ -1587,6 +1629,8 @@ static const struct ethtool_ops bcmgenet_ethtool_ops = {
 	.get_ts_info		= ethtool_op_get_ts_info,
 	.get_rxnfc		= bcmgenet_get_rxnfc,
 	.set_rxnfc		= bcmgenet_set_rxnfc,
+	.get_pauseparam		= bcmgenet_get_pauseparam,
+	.set_pauseparam		= bcmgenet_set_pauseparam,
 };
 
 /* Power down the unimac, based on mode. */
@@ -3364,6 +3408,8 @@ static int bcmgenet_open(struct net_device *dev)
 		goto err_irq1;
 	}
 
+	bcmgenet_phy_pause_set(dev, priv->rx_pause, priv->tx_pause);
+
 	bcmgenet_netif_start(dev);
 
 	netif_tx_start_all_queues(dev);
@@ -3408,11 +3454,6 @@ static void bcmgenet_netif_stop(struct net_device *dev)
 	 */
 	cancel_work_sync(&priv->bcmgenet_irq_work);
 
-	priv->old_link = -1;
-	priv->old_speed = -1;
-	priv->old_duplex = -1;
-	priv->old_pause = -1;
-
 	/* tx reclaim */
 	bcmgenet_tx_reclaim_all(dev);
 	bcmgenet_fini_dma(priv);
@@ -3950,6 +3991,11 @@ static int bcmgenet_probe(struct platform_device *pdev)
 
 	spin_lock_init(&priv->lock);
 
+	/* Set default pause parameters */
+	priv->autoneg_pause = 1;
+	priv->tx_pause = 1;
+	priv->rx_pause = 1;
+
 	SET_NETDEV_DEV(dev, &pdev->dev);
 	dev_set_drvdata(&pdev->dev, dev);
 	dev->watchdog_timeo = 2 * HZ;

drivers/net/ethernet/broadcom/genet/bcmgenet.h

@@ -594,6 +594,9 @@ struct bcmgenet_priv {
 
 	/* other misc variables */
 	struct bcmgenet_hw_params *hw_params;
+	unsigned autoneg_pause:1;
+	unsigned tx_pause:1;
+	unsigned rx_pause:1;
 
 	/* MDIO bus variables */
 	wait_queue_head_t wq;
@@ -606,10 +609,6 @@ struct bcmgenet_priv {
 	bool clk_eee_enabled;
 
 	/* PHY device variables */
-	int old_link;
-	int old_speed;
-	int old_duplex;
-	int old_pause;
 	phy_interface_t phy_interface;
 	int phy_addr;
 	int ext_phy;
@@ -690,6 +689,7 @@ int bcmgenet_mii_init(struct net_device *dev);
 int bcmgenet_mii_config(struct net_device *dev, bool init);
 int bcmgenet_mii_probe(struct net_device *dev);
 void bcmgenet_mii_exit(struct net_device *dev);
+void bcmgenet_phy_pause_set(struct net_device *dev, bool rx, bool tx);
 void bcmgenet_phy_power_set(struct net_device *dev, bool enable);
 void bcmgenet_mii_setup(struct net_device *dev);
 

drivers/net/ethernet/broadcom/genet/bcmmii.c

@@ -25,41 +25,11 @@
 
 #include "bcmgenet.h"
 
-/* setup netdev link state when PHY link status change and
- * update UMAC and RGMII block when link up
- */
-void bcmgenet_mii_setup(struct net_device *dev)
+static void bcmgenet_mac_config(struct net_device *dev)
 {
 	struct bcmgenet_priv *priv = netdev_priv(dev);
 	struct phy_device *phydev = dev->phydev;
 	u32 reg, cmd_bits = 0;
-	bool status_changed = false;
-
-	if (priv->old_link != phydev->link) {
-		status_changed = true;
-		priv->old_link = phydev->link;
-	}
-
-	if (phydev->link) {
-		/* check speed/duplex/pause changes */
-		if (priv->old_speed != phydev->speed) {
-			status_changed = true;
-			priv->old_speed = phydev->speed;
-		}
-
-		if (priv->old_duplex != phydev->duplex) {
-			status_changed = true;
-			priv->old_duplex = phydev->duplex;
-		}
-
-		if (priv->old_pause != phydev->pause) {
-			status_changed = true;
-			priv->old_pause = phydev->pause;
-		}
-
-		/* done if nothing has changed */
-		if (!status_changed)
-			return;
 
 	/* speed */
 	if (phydev->speed == SPEED_1000)
@@ -71,15 +41,31 @@ void bcmgenet_mii_setup(struct net_device *dev)
 	cmd_bits <<= CMD_SPEED_SHIFT;
 
 	/* duplex */
-		if (phydev->duplex != DUPLEX_FULL)
-			cmd_bits |= CMD_HD_EN;
+	if (phydev->duplex != DUPLEX_FULL) {
+		cmd_bits |= CMD_HD_EN |
+			CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE;
+	} else {
+		/* pause capability defaults to Symmetric */
+		if (priv->autoneg_pause) {
+			bool tx_pause = 0, rx_pause = 0;
 
-		/* pause capability */
-		if (!phydev->pause)
-			cmd_bits |= CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE;
+			if (phydev->autoneg)
+				phy_get_pause(phydev, &tx_pause, &rx_pause);
 
-		/*
-		 * Program UMAC and RGMII block based on established
+			if (!tx_pause)
+				cmd_bits |= CMD_TX_PAUSE_IGNORE;
+			if (!rx_pause)
+				cmd_bits |= CMD_RX_PAUSE_IGNORE;
+		}
+
+		/* Manual override */
+		if (!priv->rx_pause)
+			cmd_bits |= CMD_RX_PAUSE_IGNORE;
+		if (!priv->tx_pause)
+			cmd_bits |= CMD_TX_PAUSE_IGNORE;
+	}
+
+	/* Program UMAC and RGMII block based on established
 	 * link speed, duplex, and pause. The speed set in
 	 * umac->cmd tell RGMII block which clock to use for
 	 * transmit -- 25MHz(100Mbps) or 125MHz(1Gbps).
@@ -102,15 +88,17 @@ void bcmgenet_mii_setup(struct net_device *dev)
 		reg |= CMD_TX_EN | CMD_RX_EN;
 	}
 	bcmgenet_umac_writel(priv, reg, UMAC_CMD);
-	} else {
-		/* done if nothing has changed */
-		if (!status_changed)
-			return;
+}
 
-		/* needed for MoCA fixed PHY to reflect correct link status */
-		netif_carrier_off(dev);
-	}
+/* setup netdev link state when PHY link status change and
+ * update UMAC and RGMII block when link up
+ */
+void bcmgenet_mii_setup(struct net_device *dev)
+{
+	struct phy_device *phydev = dev->phydev;
 
+	if (phydev->link)
+		bcmgenet_mac_config(dev);
 	phy_print_status(phydev);
 }
 
@@ -130,6 +118,21 @@ static int bcmgenet_fixed_phy_link_update(struct net_device *dev,
 	return 0;
 }
 
+void bcmgenet_phy_pause_set(struct net_device *dev, bool rx, bool tx)
+{
+	struct phy_device *phydev = dev->phydev;
+
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->advertising, rx);
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->advertising,
+			 rx | tx);
+	phy_start_aneg(phydev);
+
+	mutex_lock(&phydev->lock);
+	if (phydev->link)
+		bcmgenet_mac_config(dev);
+	mutex_unlock(&phydev->lock);
+}
+
 void bcmgenet_phy_power_set(struct net_device *dev, bool enable)
 {
 	struct bcmgenet_priv *priv = netdev_priv(dev);
@@ -297,12 +300,6 @@ int bcmgenet_mii_probe(struct net_device *dev)
 	if (priv->internal_phy)
 		phy_flags = priv->gphy_rev;
 
-	/* Initialize link state variables that bcmgenet_mii_setup() uses */
-	priv->old_link = -1;
-	priv->old_speed = -1;
-	priv->old_duplex = -1;
-	priv->old_pause = -1;
-
 	/* This is an ugly quirk but we have not been correctly interpreting
 	 * the phy_interface values and we have done that across different
 	 * drivers, so at least we are consistent in our mistakes.
@@ -386,8 +383,6 @@ int bcmgenet_mii_probe(struct net_device *dev)
 		return ret;
 	}
 
-	linkmode_copy(phydev->advertising, phydev->supported);
-
 	/* The internal PHY has its link interrupts routed to the
 	 * Ethernet MAC ISRs. On GENETv5 there is a hardware issue
 	 * that prevents the signaling of link UP interrupts when