net: dsa: qca8k: use dsa_for_each macro instead of for loop

Convert for loop to dsa_for_each macro to save some redundant write on
unconnected/unused port and tidy things up.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20230730074113.21889-5-ansuelsmth@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Author: Ansuel

drivers/net/dsa/qca/qca8k-8xxx.c

@@ -1800,7 +1800,8 @@ static int
 qca8k_setup(struct dsa_switch *ds)
 {
 	struct qca8k_priv *priv = ds->priv;
-	int cpu_port, ret, i;
+	struct dsa_port *dp;
+	int cpu_port, ret;
 	u32 mask;
 
 	cpu_port = qca8k_find_cpu_port(ds);
@@ -1855,27 +1856,27 @@ qca8k_setup(struct dsa_switch *ds)
 		dev_warn(priv->dev, "mib init failed");
 
 	/* Initial setup of all ports */
-	for (i = 0; i < QCA8K_NUM_PORTS; i++) {
+	dsa_switch_for_each_port(dp, ds) {
 		/* Disable forwarding by default on all ports */
-		ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
+		ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(dp->index),
 				QCA8K_PORT_LOOKUP_MEMBER, 0);
 		if (ret)
 			return ret;
+	}
 
-		/* Enable QCA header mode on all cpu ports */
-		if (dsa_is_cpu_port(ds, i)) {
-			ret = qca8k_write(priv, QCA8K_REG_PORT_HDR_CTRL(i),
-					  FIELD_PREP(QCA8K_PORT_HDR_CTRL_TX_MASK, QCA8K_PORT_HDR_CTRL_ALL) |
-					  FIELD_PREP(QCA8K_PORT_HDR_CTRL_RX_MASK, QCA8K_PORT_HDR_CTRL_ALL));
-			if (ret) {
-				dev_err(priv->dev, "failed enabling QCA header mode");
-				return ret;
-			}
+	/* Disable MAC by default on all user ports */
+	dsa_switch_for_each_user_port(dp, ds)
+		qca8k_port_set_status(priv, dp->index, 0);
+
+	/* Enable QCA header mode on all cpu ports */
+	dsa_switch_for_each_cpu_port(dp, ds) {
+		ret = qca8k_write(priv, QCA8K_REG_PORT_HDR_CTRL(dp->index),
+				  FIELD_PREP(QCA8K_PORT_HDR_CTRL_TX_MASK, QCA8K_PORT_HDR_CTRL_ALL) |
+				  FIELD_PREP(QCA8K_PORT_HDR_CTRL_RX_MASK, QCA8K_PORT_HDR_CTRL_ALL));
+		if (ret) {
+			dev_err(priv->dev, "failed enabling QCA header mode on port %d", dp->index);
+			return ret;
 		}
-
-		/* Disable MAC by default on all user ports */
-		if (dsa_is_user_port(ds, i))
-			qca8k_port_set_status(priv, i, 0);
 	}
 
 	/* Forward all unknown frames to CPU port for Linux processing
@@ -1897,48 +1898,48 @@ qca8k_setup(struct dsa_switch *ds)
 		return ret;
 
 	/* Setup connection between CPU port & user ports
-	 * Configure specific switch configuration for ports
+	 * Individual user ports get connected to CPU port only
 	 */
-	for (i = 0; i < QCA8K_NUM_PORTS; i++) {
-		/* Individual user ports get connected to CPU port only */
-		if (dsa_is_user_port(ds, i)) {
-			ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
-					QCA8K_PORT_LOOKUP_MEMBER,
-					BIT(cpu_port));
-			if (ret)
-				return ret;
-
-			ret = regmap_clear_bits(priv->regmap, QCA8K_PORT_LOOKUP_CTRL(i),
-						QCA8K_PORT_LOOKUP_LEARN);
-			if (ret)
-				return ret;
-
-			/* For port based vlans to work we need to set the
-			 * default egress vid
-			 */
-			ret = qca8k_rmw(priv, QCA8K_EGRESS_VLAN(i),
-					QCA8K_EGREES_VLAN_PORT_MASK(i),
-					QCA8K_EGREES_VLAN_PORT(i, QCA8K_PORT_VID_DEF));
-			if (ret)
-				return ret;
-
-			ret = qca8k_write(priv, QCA8K_REG_PORT_VLAN_CTRL0(i),
-					  QCA8K_PORT_VLAN_CVID(QCA8K_PORT_VID_DEF) |
-					  QCA8K_PORT_VLAN_SVID(QCA8K_PORT_VID_DEF));
-			if (ret)
-				return ret;
-		}
+	dsa_switch_for_each_user_port(dp, ds) {
+		u8 port = dp->index;
+
+		ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(port),
+				QCA8K_PORT_LOOKUP_MEMBER,
+				BIT(cpu_port));
+		if (ret)
+			return ret;
+
+		ret = regmap_clear_bits(priv->regmap, QCA8K_PORT_LOOKUP_CTRL(port),
+					QCA8K_PORT_LOOKUP_LEARN);
+		if (ret)
+			return ret;
 
-		/* The port 5 of the qca8337 have some problem in flood condition. The
-		 * original legacy driver had some specific buffer and priority settings
-		 * for the different port suggested by the QCA switch team. Add this
-		 * missing settings to improve switch stability under load condition.
-		 * This problem is limited to qca8337 and other qca8k switch are not affected.
+		/* For port based vlans to work we need to set the
+		 * default egress vid
 		 */
-		if (priv->switch_id == QCA8K_ID_QCA8337)
-			qca8k_setup_hol_fixup(priv, i);
+		ret = qca8k_rmw(priv, QCA8K_EGRESS_VLAN(port),
+				QCA8K_EGREES_VLAN_PORT_MASK(port),
+				QCA8K_EGREES_VLAN_PORT(port, QCA8K_PORT_VID_DEF));
+		if (ret)
+			return ret;
+
+		ret = qca8k_write(priv, QCA8K_REG_PORT_VLAN_CTRL0(port),
+				  QCA8K_PORT_VLAN_CVID(QCA8K_PORT_VID_DEF) |
+				  QCA8K_PORT_VLAN_SVID(QCA8K_PORT_VID_DEF));
+		if (ret)
+			return ret;
 	}
 
+	/* The port 5 of the qca8337 have some problem in flood condition. The
+	 * original legacy driver had some specific buffer and priority settings
+	 * for the different port suggested by the QCA switch team. Add this
+	 * missing settings to improve switch stability under load condition.
+	 * This problem is limited to qca8337 and other qca8k switch are not affected.
+	 */
+	if (priv->switch_id == QCA8K_ID_QCA8337)
+		dsa_switch_for_each_available_port(dp, ds)
+			qca8k_setup_hol_fixup(priv, dp->index);
+
 	/* Special GLOBAL_FC_THRESH value are needed for ar8327 switch */
 	if (priv->switch_id == QCA8K_ID_QCA8327) {
 		mask = QCA8K_GLOBAL_FC_GOL_XON_THRES(288) |