net: dsa: Add a ports structure and use it in the switch structure

There are going to be more per-port members added to the switch
structure. So add a port structure and move the netdev into it.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 17c3d37..9aed857 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -119,6 +119,10 @@
 	struct dsa_switch	*ds[DSA_MAX_SWITCHES];
 };
 
+struct dsa_port {
+	struct net_device	*netdev;
+};
+
 struct dsa_switch {
 	struct device *dev;
 
@@ -158,8 +162,8 @@
 	u32			dsa_port_mask;
 	u32			enabled_port_mask;
 	u32			phys_mii_mask;
+	struct dsa_port		ports[DSA_MAX_PORTS];
 	struct mii_bus		*slave_mii_bus;
-	struct net_device	*ports[DSA_MAX_PORTS];
 };
 
 static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
@@ -174,7 +178,7 @@
 
 static inline bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
 {
-	return ds->enabled_port_mask & (1 << p) && ds->ports[p];
+	return ds->enabled_port_mask & (1 << p) && ds->ports[p].netdev;
 }
 
 static inline u8 dsa_upstream_port(struct dsa_switch *ds)