rlc_metrics: add sdu rx latency and buffered bytes

lib/include/srslte/upper/rlc_metrics.h

@@ -25,7 +25,7 @@ typedef struct {
   uint64_t num_tx_sdu_bytes;
   uint64_t num_rx_sdu_bytes;
   uint32_t num_lost_sdus; //< Count dropped SDUs at Tx due to bearer inactivity or empty buffer
-  uint64_t sdu_tx_latency_us;
+  uint64_t rx_latency_ms; //< Average time in ms from first RLC segment to full SDU
 
   // PDU metrics
   uint32_t num_tx_pdus;
@@ -33,6 +33,9 @@ typedef struct {
   uint64_t num_tx_pdu_bytes;
   uint64_t num_rx_pdu_bytes;
   uint32_t num_lost_pdus; //< Lost PDUs registered at Rx
+
+  // misc metrics
+  uint32_t rx_buffered_bytes; //< sum of payload of PDUs buffered in rx_window
 } rlc_bearer_metrics_t;
 
 typedef struct {

lib/src/upper/rlc_am_lte.cc

@@ -837,17 +837,7 @@ int rlc_am_lte::rlc_am_lte_tx::build_data_pdu(uint8_t* payload, uint32_t nof_byt
     tx_sdu->N_bytes -= to_move;
     tx_sdu->msg += to_move;
     if (tx_sdu->N_bytes == 0) {
-#ifdef ENABLE_TIMESTAMP
+      log->debug("%s Complete SDU scheduled for tx.\n", RB_NAME);
-      long latency_us = tx_sdu->get_latency_us().count();
-      mean_pdu_latency_us.push(latency_us);
-      parent->metrics.sdu_tx_latency_us = mean_pdu_latency_us.value();
-      log->debug("%s Complete SDU scheduled for tx. Stack latency (last/average): %ld/%ld us\n",
-                 RB_NAME,
-                 latency_us,
-                 (long)parent->metrics.sdu_tx_latency_us);
-#else
-      log->debug("%s Complete SDU scheduled for tx.\n", rb_name.c_str());
-#endif
       tx_sdu.reset();
     }
     if (pdu_space > to_move) {
@@ -886,17 +876,7 @@ int rlc_am_lte::rlc_am_lte_tx::build_data_pdu(uint8_t* payload, uint32_t nof_byt
     tx_sdu->N_bytes -= to_move;
     tx_sdu->msg += to_move;
     if (tx_sdu->N_bytes == 0) {
-#ifdef ENABLE_TIMESTAMP
+      log->debug("%s Complete SDU scheduled for tx.\n", RB_NAME);
-      long latency_us = tx_sdu->get_latency_us().count();
-      mean_pdu_latency_us.push(latency_us);
-      parent->metrics.sdu_tx_latency_us = mean_pdu_latency_us.value();
-      log->debug("%s Complete SDU scheduled for tx. Stack latency (last/average): %ld/%ld us\n",
-                 RB_NAME,
-                 latency_us,
-                 (long)parent->metrics.sdu_tx_latency_us);
-#else
-      log->debug("%s Complete SDU scheduled for tx.\n", rb_name.c_str());
-#endif
       tx_sdu.reset();
     }
     if (pdu_space > to_move) {