switchdev: add switchdev_trans_ph_prepare/commit helpers

Add helpers which should be used int attr_set/obj_add switchdev ops to
check the phase of transaction.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/switchdev.h

@@ -35,6 +35,16 @@ struct switchdev_trans {
 	enum switchdev_trans_ph ph;
 };
 
+static inline bool switchdev_trans_ph_prepare(struct switchdev_trans *trans)
+{
+	return trans && trans->ph == SWITCHDEV_TRANS_PREPARE;
+}
+
+static inline bool switchdev_trans_ph_commit(struct switchdev_trans *trans)
+{
+	return trans && trans->ph == SWITCHDEV_TRANS_COMMIT;
+}
+
 enum switchdev_attr_id {
 	SWITCHDEV_ATTR_UNDEFINED,
 	SWITCHDEV_ATTR_PORT_PARENT_ID,