fw: Forwarder provides CS hit/miss counters

refs #4219

Change-Id: I7058c43bac4a5508d4b9907f6e684663b8953656
diff --git a/daemon/fw/forwarder-counters.hpp b/daemon/fw/forwarder-counters.hpp
index 3f8c751..5a63406 100644
--- a/daemon/fw/forwarder-counters.hpp
+++ b/daemon/fw/forwarder-counters.hpp
@@ -1,12 +1,12 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014,  Regents of the University of California,
- *                      Arizona Board of Regents,
- *                      Colorado State University,
- *                      University Pierre & Marie Curie, Sorbonne University,
- *                      Washington University in St. Louis,
- *                      Beijing Institute of Technology,
- *                      The University of Memphis
+/*
+ * Copyright (c) 2014-2017,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
  *
  * This file is part of NFD (Named Data Networking Forwarding Daemon).
  * See AUTHORS.md for complete list of NFD authors and contributors.
@@ -41,6 +41,9 @@
   PacketCounter nOutData;
   PacketCounter nInNacks;
   PacketCounter nOutNacks;
+
+  PacketCounter nCsHits;
+  PacketCounter nCsMisses;
 };
 
 } // namespace nfd
diff --git a/daemon/fw/forwarder.cpp b/daemon/fw/forwarder.cpp
index 9e0b8bb..69a93de 100644
--- a/daemon/fw/forwarder.cpp
+++ b/daemon/fw/forwarder.cpp
@@ -164,6 +164,7 @@
                               const Interest& interest)
 {
   NFD_LOG_DEBUG("onContentStoreMiss interest=" << interest.getName());
+  ++m_counters.nCsMisses;
 
   // insert in-record
   pitEntry->insertOrUpdateInRecord(const_cast<Face&>(inFace), interest);
@@ -195,6 +196,7 @@
                              const Interest& interest, const Data& data)
 {
   NFD_LOG_DEBUG("onContentStoreHit interest=" << interest.getName());
+  ++m_counters.nCsHits;
 
   data.setTag(make_shared<lp::IncomingFaceIdTag>(face::FACEID_CONTENT_STORE));
   // XXX should we lookup PIT for other Interests that also match csMatch?