net: dsa: use ports list to setup multiple master devices

Now that we have a potential list of CPU ports, make use of it instead
of only configuring the master device of an unique CPU port.
Signed-off-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

net/dsa/dsa2.c

@@ -493,19 +493,27 @@ static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst)
 
 static int dsa_tree_setup_master(struct dsa_switch_tree *dst)
 {
-	struct dsa_port *cpu_dp = dst->cpu_dp;
-	struct net_device *master = cpu_dp->master;
+	struct dsa_port *dp;
+	int err;
 
-	/* DSA currently supports a single pair of CPU port and master device */
-	return dsa_master_setup(master, cpu_dp);
+	list_for_each_entry(dp, &dst->ports, list) {
+		if (dsa_port_is_cpu(dp)) {
+			err = dsa_master_setup(dp->master, dp);
+			if (err)
+				return err;
+		}
+	}
+
+	return 0;
 }
 
 static void dsa_tree_teardown_master(struct dsa_switch_tree *dst)
 {
-	struct dsa_port *cpu_dp = dst->cpu_dp;
-	struct net_device *master = cpu_dp->master;
+	struct dsa_port *dp;
 
-	return dsa_master_teardown(master);
+	list_for_each_entry(dp, &dst->ports, list)
+		if (dsa_port_is_cpu(dp))
+			dsa_master_teardown(dp->master);
 }
 
 static int dsa_tree_setup(struct dsa_switch_tree *dst)