openvswitch: Add gre tunnel support.

Add gre vport implementation.  Most of gre protocol processing
is pushed to gre module. It make use of gre demultiplexer
therefore it can co-exist with linux device based gre tunnels.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 0 deletions

diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 413287a1877f..f52dfb9cb5a7 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -38,6 +38,10 @@
 static const struct vport_ops *vport_ops_list[] = {
         &ovs_netdev_vport_ops,
         &ovs_internal_vport_ops,
+
+#ifdef CONFIG_NET_IPGRE_DEMUX
+        &ovs_gre_vport_ops,
+#endif
 };
 
 /* Protected by RCU read lock for reading, ovs_mutex for writing. */
@@ -404,3 +408,18 @@ void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type)
 
         spin_unlock(&vport->stats_lock);
 }
+
+static void free_vport_rcu(struct rcu_head *rcu)
+{
+        struct vport *vport = container_of(rcu, struct vport, rcu);
+
+        ovs_vport_free(vport);
+}
+
+void ovs_vport_deferred_free(struct vport *vport)
+{
+        if (!vport)
+                return;
+
+        call_rcu(&vport->rcu, free_vport_rcu);
+}