rocker: Check Handle PORT_PRE_BRIDGE_FLAGS

In preparation for getting rid of switchdev_port_attr_get(), have rocker
check for the bridge flags being set through switchdev_port_attr_set()
with the SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS attribute identifier.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/rocker/rocker_main.c

@@ -1566,34 +1566,57 @@ static int rocker_world_port_attr_stp_state_set(struct rocker_port *rocker_port,
 }
 
 static int
-rocker_world_port_attr_bridge_flags_set(struct rocker_port *rocker_port,
-					unsigned long brport_flags,
-					struct switchdev_trans *trans)
+rocker_world_port_attr_bridge_flags_support_get(const struct rocker_port *
+						rocker_port,
+						unsigned long *
+						p_brport_flags_support)
 {
 	struct rocker_world_ops *wops = rocker_port->rocker->wops;
 
+	if (!wops->port_attr_bridge_flags_support_get)
+		return -EOPNOTSUPP;
+	return wops->port_attr_bridge_flags_support_get(rocker_port,
+							p_brport_flags_support);
+}
+
+static int
+rocker_world_port_attr_pre_bridge_flags_set(struct rocker_port *rocker_port,
+					    unsigned long brport_flags,
+					    struct switchdev_trans *trans)
+{
+	struct rocker_world_ops *wops = rocker_port->rocker->wops;
+	unsigned long brport_flags_s;
+	int err;
+
 	if (!wops->port_attr_bridge_flags_set)
 		return -EOPNOTSUPP;
 
-	if (switchdev_trans_ph_prepare(trans))
-		return 0;
+	err = rocker_world_port_attr_bridge_flags_support_get(rocker_port,
+							      &brport_flags_s);
+	if (err)
+		return err;
 
-	return wops->port_attr_bridge_flags_set(rocker_port, brport_flags,
-						trans);
+	if (brport_flags & ~brport_flags_s)
+		return -EINVAL;
+
+	return 0;
 }
 
 static int
-rocker_world_port_attr_bridge_flags_support_get(const struct rocker_port *
-						rocker_port,
-						unsigned long *
-						p_brport_flags_support)
+rocker_world_port_attr_bridge_flags_set(struct rocker_port *rocker_port,
+					unsigned long brport_flags,
+					struct switchdev_trans *trans)
 {
 	struct rocker_world_ops *wops = rocker_port->rocker->wops;
 
-	if (!wops->port_attr_bridge_flags_support_get)
+	if (!wops->port_attr_bridge_flags_set)
 		return -EOPNOTSUPP;
-	return wops->port_attr_bridge_flags_support_get(rocker_port,
-							p_brport_flags_support);
+
+	if (switchdev_trans_ph_prepare(trans))
+		return 0;
+
+	return wops->port_attr_bridge_flags_set(rocker_port, brport_flags,
+						trans);
 }
 
 static int
@@ -2074,6 +2097,10 @@ static int rocker_port_attr_set(struct net_device *dev,
 							   attr->u.stp_state,
 							   trans);
 		break;
+	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
+		err = rocker_world_port_attr_pre_bridge_flags_set(rocker_port,
+							      attr->u.brport_flags,
+							      trans);
 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
 		err = rocker_world_port_attr_bridge_flags_set(rocker_port,
 							      attr->u.brport_flags,