Added structure to hold PDCP metrics

lib/include/srslte/upper/pdcp_metrics.h

@@ -0,0 +1,35 @@
+/**
+ *
+ * \section COPYRIGHT
+ *
+ * Copyright 2013-2020 Software Radio Systems Limited
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the distribution.
+ *
+ */
+
+#ifndef SRSLTE_PDCP_METRICS_H
+#define SRSLTE_PDCP_METRICS_H
+
+#include "srslte/common/common.h"
+#include <iostream>
+
+namespace srslte {
+
+typedef struct {
+  // ACK specific metrics (requires RLC AM)
+  uint64_t num_tx_acked_bytes;         //< Cumulative number of bytes that the PDCP knows to be acknowledged
+  uint64_t tx_notification_latency_ms; //< Average time in ms from PDU delivery to RLC to ACK notification from RLC
+  uint32_t num_tx_buffered_pdus;       //< Number of PDUs waiting for ACK
+  uint32_t num_tx_buffered_pdus_bytes; //< Number of bytes of PDUs waiting for ACK
+} pdcp_bearer_metrics_t;
+
+typedef struct {
+  pdcp_bearer_metrics_t bearer[SRSLTE_N_RADIO_BEARERS];
+} pdcp_metrics_t;
+
+} // namespace srslte
+
+#endif // SRSLTE_RLC_METRICS_H