net: bridge: split out the switchdev portion of br_mdb_notify

Similar to fdb_notify() and br_switchdev_fdb_notify(), split the
switchdev specific logic from br_mdb_notify() into a different function.
This will be moved later in br_switchdev.c.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/bridge/br_mdb.c

@@ -759,7 +759,7 @@ static void br_mdb_switchdev_host(struct net_device *dev,
 		br_mdb_switchdev_host_port(dev, lower_dev, mp, type);
 }
 
-void br_mdb_notify(struct net_device *dev,
+static void br_switchdev_mdb_notify(struct net_device *dev,
 				    struct net_bridge_mdb_entry *mp,
 				    struct net_bridge_port_group *pg,
 				    int type)
@@ -771,11 +771,10 @@ void br_mdb_notify(struct net_device *dev,
 			.flags = SWITCHDEV_F_DEFER,
 		},
 	};
-	struct net *net = dev_net(dev);
-	struct sk_buff *skb;
-	int err = -ENOBUFS;
 
-	if (pg) {
+	if (!pg)
+		return br_mdb_switchdev_host(dev, mp, type);
+
 	br_switchdev_mdb_populate(&mdb, mp);
 
 	mdb.obj.orig_dev = pg->key.port->dev;
@@ -795,9 +794,18 @@ void br_mdb_notify(struct net_device *dev,
 		switchdev_port_obj_del(pg->key.port->dev, &mdb.obj);
 		break;
 	}
-	} else {
-		br_mdb_switchdev_host(dev, mp, type);
-	}
+}
+
+void br_mdb_notify(struct net_device *dev,
+		   struct net_bridge_mdb_entry *mp,
+		   struct net_bridge_port_group *pg,
+		   int type)
+{
+	struct net *net = dev_net(dev);
+	struct sk_buff *skb;
+	int err = -ENOBUFS;
+
+	br_switchdev_mdb_notify(dev, mp, pg, type);
 
 	skb = nlmsg_new(rtnl_mdb_nlmsg_size(pg), GFP_ATOMIC);
 	if (!skb)