net: Merge VXLAN and GENEVE push notifiers into a single notifier

This patch merges the notifiers for VXLAN and GENEVE into a single UDP
tunnel notifier.  The idea is that we will want to only have to make one
notifier call to receive the list of ports for VXLAN and GENEVE tunnels
that need to be offloaded.

In addition we add a new set of ndo functions named ndo_udp_tunnel_add and
ndo_udp_tunnel_del that are meant to allow us to track the tunnel meta-data
such as port and address family as tunnels are added and removed.  The
tunnel meta-data is now transported in a structure named udp_tunnel_info
which for now carries the type, address family, and port number.  In the
future this could be updated so that we can include a tuple of values
including things such as the destination IP address and other fields.

I also ended up going with a naming scheme that consisted of using the
prefix udp_tunnel on function names.  I applied this to the notifier and
ndo ops as well so that it hopefully points to the fact that these are
primarily used in the udp_tunnel functions.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 2 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 890158e99159..577d2a1814b1 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -61,6 +61,8 @@ struct wireless_dev;
 /* 802.15.4 specific */
 struct wpan_dev;
 struct mpls_dev;
+/* UDP Tunnel offloads */
+struct udp_tunnel_info;
 
 void netdev_set_default_ethtool_ops(struct net_device *dev,
                                     const struct ethtool_ops *ops);
@@ -1050,6 +1052,19 @@ struct tc_to_netdev {
  *      address family that vxlan is not listening to anymore. The operation
  *      is protected by the vxlan_net->sock_lock.
  *
+ * void (*ndo_udp_tunnel_add)(struct net_device *dev,
+ *                            struct udp_tunnel_info *ti);
+ *      Called by UDP tunnel to notify a driver about the UDP port and socket
+ *      address family that a UDP tunnel is listnening to. It is called only
+ *      when a new port starts listening. The operation is protected by the
+ *      RTNL.
+ *
+ * void (*ndo_udp_tunnel_del)(struct net_device *dev,
+ *                            struct udp_tunnel_info *ti);
+ *      Called by UDP tunnel to notify the driver about a UDP port and socket
+ *      address family that the UDP tunnel is not listening to anymore. The
+ *      operation is protected by the RTNL.
+ *
  * void* (*ndo_dfwd_add_station)(struct net_device *pdev,
  *                               struct net_device *dev)
  *      Called by upper layer devices to accelerate switching or other
@@ -1269,6 +1284,10 @@ struct net_device_ops {
         void                    (*ndo_del_geneve_port)(struct  net_device *dev,
                                                        sa_family_t sa_family,
                                                        __be16 port);
+        void                    (*ndo_udp_tunnel_add)(struct net_device *dev,
+                                                      struct udp_tunnel_info *ti);
+        void                    (*ndo_udp_tunnel_del)(struct net_device *dev,
+                                                      struct udp_tunnel_info *ti);
         void*                   (*ndo_dfwd_add_station)(struct net_device *pdev,
                                                         struct net_device *dev);
         void                    (*ndo_dfwd_del_station)(struct net_device *pdev,
@@ -2255,8 +2274,7 @@ struct netdev_lag_lower_state_info {
 #define NETDEV_BONDING_INFO     0x0019
 #define NETDEV_PRECHANGEUPPER   0x001A
 #define NETDEV_CHANGELOWERSTATE 0x001B
-#define NETDEV_OFFLOAD_PUSH_VXLAN       0x001C
-#define NETDEV_OFFLOAD_PUSH_GENEVE      0x001D
+#define NETDEV_UDP_TUNNEL_PUSH_INFO     0x001C
 
 int register_netdevice_notifier(struct notifier_block *nb);
 int unregister_netdevice_notifier(struct notifier_block *nb);