openvswitch: introduce rtnl ops stub

This stub now allows userspace to see IFLA_INFO_KIND for ovs master and
IFLA_INFO_SLAVE_KIND for slave.

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

net/openvswitch/datapath.c

@@ -2054,10 +2054,14 @@ static int __init dp_init(void)
 
 	pr_info("Open vSwitch switching datapath\n");
 
-	err = ovs_flow_init();
+	err = ovs_internal_dev_rtnl_link_register();
 	if (err)
 		goto error;
 
+	err = ovs_flow_init();
+	if (err)
+		goto error_unreg_rtnl_link;
+
 	err = ovs_vport_init();
 	if (err)
 		goto error_flow_exit;
@@ -2084,6 +2088,8 @@ static int __init dp_init(void)
 	ovs_vport_exit();
 error_flow_exit:
 	ovs_flow_exit();
+error_unreg_rtnl_link:
+	ovs_internal_dev_rtnl_link_unregister();
 error:
 	return err;
 }
@@ -2096,6 +2102,7 @@ static void dp_cleanup(void)
 	rcu_barrier();
 	ovs_vport_exit();
 	ovs_flow_exit();
+	ovs_internal_dev_rtnl_link_unregister();
 }
 
 module_init(dp_init);

net/openvswitch/vport-internal_dev.c

@@ -26,6 +26,7 @@
 
 #include <net/dst.h>
 #include <net/xfrm.h>
+#include <net/rtnetlink.h>
 
 #include "datapath.h"
 #include "vport-internal_dev.h"
@@ -121,6 +122,10 @@ static const struct net_device_ops internal_dev_netdev_ops = {
 	.ndo_get_stats64 = internal_dev_get_stats,
 };
 
+static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
+	.kind = "openvswitch",
+};
+
 static void do_setup(struct net_device *netdev)
 {
 	ether_setup(netdev);
@@ -131,6 +136,7 @@ static void do_setup(struct net_device *netdev)
 	netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
 	netdev->destructor = internal_dev_destructor;
 	netdev->ethtool_ops = &internal_dev_ethtool_ops;
+	netdev->rtnl_link_ops = &internal_dev_link_ops;
 	netdev->tx_queue_len = 0;
 
 	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
@@ -248,3 +254,13 @@ struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
 
 	return internal_dev_priv(netdev)->vport;
 }
+
+int ovs_internal_dev_rtnl_link_register(void)
+{
+	return rtnl_link_register(&internal_dev_link_ops);
+}
+
+void ovs_internal_dev_rtnl_link_unregister(void)
+{
+	rtnl_link_unregister(&internal_dev_link_ops);
+}

net/openvswitch/vport-internal_dev.h

@@ -24,5 +24,7 @@
 
 int ovs_is_internal_dev(const struct net_device *);
 struct vport *ovs_internal_dev_get_vport(struct net_device *);
+int ovs_internal_dev_rtnl_link_register(void);
+void ovs_internal_dev_rtnl_link_unregister(void);
 
 #endif /* vport-internal_dev.h */