Add number of ack frames sent counter for connection

Reviewed By: mjoras

Differential Revision: D62206780

fbshipit-source-id: 60bf94971a31335469a56efcb0a97dcb40ec15c0

quic/api/QuicTransportFunctions.cpp

@@ -709,6 +709,7 @@ void updateConnection(
                  << " sent packet with largestAcked="
                  << largestAckedPacketWritten << " packetNum=" << packetNum
                  << " " << conn;
+        ++conn.numAckFramesSent;
         updateAckSendStateOnSentPacketWithAcks(
             conn,
             getAckState(conn, packetNumberSpace),

quic/client/QuicClientTransport.cpp

@@ -1861,4 +1861,8 @@ void QuicClientTransport::RecvmmsgStorage::resize(size_t numPackets) {
   }
 }
 
+uint64_t QuicClientTransport::getNumAckFramesSent() const {
+  return conn_->numAckFramesSent;
+}
+
 } // namespace quic

quic/client/QuicClientTransport.h

@@ -216,6 +216,8 @@ class QuicClientTransport
   Optional<std::vector<TransportParameter>> getPeerTransportParams()
       const override;
 
+  uint64_t getNumAckFramesSent() const;
+
   class HappyEyeballsConnAttemptDelayTimeout : public QuicTimerCallback {
    public:
     explicit HappyEyeballsConnAttemptDelayTimeout(

quic/state/StateData.h

@@ -492,6 +492,8 @@ struct QuicConnectionStateBase : public folly::DelayedDestruction {
   // This contains the ack and packet number related states for all three
   // packet number spaces.
   AckStates ackStates;
+  // Number of ack frames sent on connection across all packet number spaces.
+  uint64_t numAckFramesSent{0};
 
   struct ConnectionFlowControlState {
     // The size of the connection flow control window.