Merge pull request #1663 from weaveworks/issues/1592-fdp-miss-counter

Add FDP miss counter to reports

router/fastdp.go

@@ -40,6 +40,7 @@ type FastDatapath struct {
 	dpif             *odp.Dpif
 	dp               odp.DatapathHandle
 	deleteFlowsCount uint64
+	missCount        uint64
 	missHandlers     map[odp.VportID]missHandler
 	localPeer        *mesh.Peer
 	peers            *mesh.Peers
@@ -216,8 +217,13 @@ func (fastdp fastDatapathBridge) String() string {
 	return fmt.Sprint(fastdp.dpname, " (via ODP)")
 }
 
-func (fastDatapathBridge) Stats() map[string]int {
-	return nil
+func (fastdp fastDatapathBridge) Stats() map[string]int {
+	lock := fastdp.startLock()
+	defer lock.unlock()
+
+	return map[string]int{
+		"FlowMisses": int(fastdp.missCount),
+	}
 }
 
 var routerBridgePortID = bridgePortID{router: true}
@@ -937,6 +943,8 @@ func (fastdp *FastDatapath) Miss(packet []byte, fks odp.FlowKeys) error {
 	lock := fastdp.startLock()
 	defer lock.unlock()
 
+	fastdp.missCount++
+
 	handler := fastdp.getMissHandler(ingress)
 	if handler == nil {
 		return nil