Reduce log level of SDUs dropped in the stack to info. Added ul_dropped_sdus to stack metrics.

srsue/hdr/stack/ue_stack_lte.h

@@ -195,6 +195,9 @@ private:
 #endif
   srsue::nas                 nas;
   std::unique_ptr<usim_base> usim;
+
+  // Metrics helper
+  uint32_t ul_dropped_sdus = 0;
 };
 
 } // namespace srsue

srsue/hdr/ue_metrics_interface.h

@@ -27,6 +27,7 @@
 namespace srsue {
 
 typedef struct {
+  uint32_t              ul_dropped_sdus;
   mac_metrics_t         mac[SRSLTE_MAX_CARRIERS];
   srslte::rlc_metrics_t rlc;
   nas_metrics_t         nas;

srsue/src/stack/ue_stack_lte.cc

@@ -240,6 +240,7 @@ bool ue_stack_lte::get_metrics(stack_metrics_t* metrics)
   // use stack thread to query metrics
   ue_task_queue.try_push([this]() {
     stack_metrics_t metrics{};
+    metrics.ul_dropped_sdus = ul_dropped_sdus;
     mac.get_metrics(metrics.mac);
     rlc.get_metrics(metrics.rlc, metrics.mac[0].nof_tti);
     nas.get_metrics(&metrics.nas);
@@ -277,7 +278,8 @@ void ue_stack_lte::write_sdu(uint32_t lcid, srslte::unique_byte_buffer_t sdu)
   auto task = [this, lcid](srslte::unique_byte_buffer_t& sdu) { pdcp.write_sdu(lcid, std::move(sdu)); };
   bool ret  = gw_queue_id.try_push(std::bind(task, std::move(sdu))).first;
   if (not ret) {
-    pdcp_logger.warning("GW SDU with lcid=%d was discarded.", lcid);
+    pdcp_logger.info("GW SDU with lcid=%d was discarded.", lcid);
+    ul_dropped_sdus++;
   }
 }