ofproto-dpif: Implement patch ports in userspace.

This commit moves responsibility for implementing patch ports from
the datapath to ofproto-dpif.  There are two main reasons to do
this.

The first is a matter of design:  ofproto-dpif both has more
information than the datapath, and is better suited to handle the
complexity required to implement patch ports.

The second is performance.  My setup is a virtual machine with two
basic learning bridges connected by patch ports.  I used
ovs-benchmark to ping the virtual router IP residing outside the
VM.  Over a 60 second run, "ovs-benchmark rate" improves from
14618.1 to 19311.9 transactions per second, or a 32% improvement.
Similarly, "ovs-benchmark latency" improves from 6ms to 4ms.

Signed-off-by: Ethan Jackson <ethan@nicira.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/lib/netdev-vport.h b/lib/netdev-vport.h
index 31c119870..b372a7448 100644
--- a/lib/netdev-vport.h
+++ b/lib/netdev-vport.h
@@ -18,9 +18,9 @@
 #define NETDEV_VPORT_H 1
 
 #include <stdbool.h>
-#include "openvswitch/types.h"
 
 struct dpif_linux_vport;
+struct dpif_flow_stats;
 struct netdev;
 struct netdev_stats;
 
@@ -30,7 +30,15 @@ const struct ofpbuf *netdev_vport_get_options(const struct netdev *);
 
 enum ovs_vport_type netdev_vport_get_vport_type(const struct netdev *);
 const char *netdev_vport_get_netdev_type(const struct dpif_linux_vport *);
+bool netdev_vport_is_patch(const struct netdev *);
 
 int netdev_vport_get_stats(const struct netdev *, struct netdev_stats *);
 
+const char *netdev_vport_patch_peer(const struct netdev *netdev);
+
+void netdev_vport_patch_inc_rx(const struct netdev *,
+                               const struct dpif_flow_stats *);
+void netdev_vport_patch_inc_tx(const struct netdev *,
+                               const struct dpif_flow_stats *);
+
 #endif /* netdev-vport.h */