net: dsa: consolidate phylink creation

The code in port.c and slave.c creating the phylink instance is very
similar - let's consolidate this into a single function.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/dsa/dsa_priv.h

@@ -258,13 +258,13 @@ int dsa_port_mrp_add_ring_role(const struct dsa_port *dp,
 			       const struct switchdev_obj_ring_role_mrp *mrp);
 int dsa_port_mrp_del_ring_role(const struct dsa_port *dp,
 			       const struct switchdev_obj_ring_role_mrp *mrp);
+int dsa_port_phylink_create(struct dsa_port *dp);
 int dsa_port_link_register_of(struct dsa_port *dp);
 void dsa_port_link_unregister_of(struct dsa_port *dp);
 int dsa_port_hsr_join(struct dsa_port *dp, struct net_device *hsr);
 void dsa_port_hsr_leave(struct dsa_port *dp, struct net_device *hsr);
 int dsa_port_tag_8021q_vlan_add(struct dsa_port *dp, u16 vid, bool broadcast);
 void dsa_port_tag_8021q_vlan_del(struct dsa_port *dp, u16 vid, bool broadcast);
-extern const struct phylink_mac_ops dsa_port_phylink_mac_ops;
 
 static inline bool dsa_port_offloads_bridge_port(struct dsa_port *dp,
 						 const struct net_device *dev)

net/dsa/port.c

@@ -1072,7 +1072,7 @@ static void dsa_port_phylink_mac_link_up(struct phylink_config *config,
 				     speed, duplex, tx_pause, rx_pause);
 }
 
-const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
+static const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
 	.validate = dsa_port_phylink_validate,
 	.mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state,
 	.mac_config = dsa_port_phylink_mac_config,
@@ -1081,6 +1081,30 @@ const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
 	.mac_link_up = dsa_port_phylink_mac_link_up,
 };
 
+int dsa_port_phylink_create(struct dsa_port *dp)
+{
+	struct dsa_switch *ds = dp->ds;
+	phy_interface_t mode;
+	int err;
+
+	err = of_get_phy_mode(dp->dn, &mode);
+	if (err)
+		mode = PHY_INTERFACE_MODE_NA;
+
+	if (ds->ops->phylink_get_interfaces)
+		ds->ops->phylink_get_interfaces(ds, dp->index,
+					dp->pl_config.supported_interfaces);
+
+	dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(dp->dn),
+				mode, &dsa_port_phylink_mac_ops);
+	if (IS_ERR(dp->pl)) {
+		pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
+		return PTR_ERR(dp->pl);
+	}
+
+	return 0;
+}
+
 static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
 {
 	struct dsa_switch *ds = dp->ds;
@@ -1157,27 +1181,15 @@ static int dsa_port_phylink_register(struct dsa_port *dp)
 {
 	struct dsa_switch *ds = dp->ds;
 	struct device_node *port_dn = dp->dn;
-	phy_interface_t mode;
 	int err;
 
-	err = of_get_phy_mode(port_dn, &mode);
-	if (err)
-		mode = PHY_INTERFACE_MODE_NA;
-
 	dp->pl_config.dev = ds->dev;
 	dp->pl_config.type = PHYLINK_DEV;
 	dp->pl_config.pcs_poll = ds->pcs_poll;
 
-	if (ds->ops->phylink_get_interfaces)
-		ds->ops->phylink_get_interfaces(ds, dp->index,
-					dp->pl_config.supported_interfaces);
-
-	dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn),
-				mode, &dsa_port_phylink_mac_ops);
-	if (IS_ERR(dp->pl)) {
-		pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
-		return PTR_ERR(dp->pl);
-	}
+	err = dsa_port_phylink_create(dp);
+	if (err)
+		return err;
 
 	err = phylink_of_phy_connect(dp->pl, port_dn, 0);
 	if (err && err != -ENODEV) {

net/dsa/slave.c

@@ -1851,14 +1851,9 @@ static int dsa_slave_phy_setup(struct net_device *slave_dev)
 	struct dsa_port *dp = dsa_slave_to_port(slave_dev);
 	struct device_node *port_dn = dp->dn;
 	struct dsa_switch *ds = dp->ds;
-	phy_interface_t mode;
 	u32 phy_flags = 0;
 	int ret;
 
-	ret = of_get_phy_mode(port_dn, &mode);
-	if (ret)
-		mode = PHY_INTERFACE_MODE_NA;
-
 	dp->pl_config.dev = &slave_dev->dev;
 	dp->pl_config.type = PHYLINK_NETDEV;
 
@@ -1871,17 +1866,9 @@ static int dsa_slave_phy_setup(struct net_device *slave_dev)
 		dp->pl_config.poll_fixed_state = true;
 	}
 
-	if (ds->ops->phylink_get_interfaces)
-		ds->ops->phylink_get_interfaces(ds, dp->index,
-					dp->pl_config.supported_interfaces);
-
-	dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn), mode,
-				&dsa_port_phylink_mac_ops);
-	if (IS_ERR(dp->pl)) {
-		netdev_err(slave_dev,
-			   "error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
-		return PTR_ERR(dp->pl);
-	}
+	ret = dsa_port_phylink_create(dp);
+	if (ret)
+		return ret;
 
 	if (ds->ops->get_phy_flags)
 		phy_flags = ds->ops->get_phy_flags(ds, dp->index);