nr rlc tm: reduce "SDU rejected" logging

once per second is enough

openair2/LAYER2/nr_rlc/nr_rlc_entity_tm.c

@@ -136,9 +136,16 @@ void nr_rlc_entity_tm_recv_sdu(nr_rlc_entity_t *_entity,
     exit(1);
   }
 
+  /* log SDUs rejected, at most once per second */
+  if (entity->sdu_rejected != 0
+      && entity->t_current > entity->t_log_buffer_full + 1000) {
+    LOG_E(RLC, "%d SDU rejected, SDU buffer full\n", entity->sdu_rejected);
+    entity->sdu_rejected = 0;
+    entity->t_log_buffer_full = entity->t_current;
+  }
+
   if (entity->tx_size + size > entity->tx_maxsize) {
-    LOG_D(RLC, "%s:%d:%s: warning: SDU rejected, SDU buffer full\n",
-          __FILE__, __LINE__, __FUNCTION__);
+    entity->sdu_rejected++;
 
     entity->common.stats.rxsdu_dd_pkts++;
     entity->common.stats.rxsdu_dd_bytes += size;
@@ -181,6 +188,9 @@ void nr_rlc_entity_tm_discard_sdu(nr_rlc_entity_t *_entity, int sdu_id)
 
 static void clear_entity(nr_rlc_entity_tm_t *entity)
 {
+  entity->t_log_buffer_full = 0;
+  entity->sdu_rejected      = 0;
+
   nr_rlc_free_sdu_segment_list(entity->tx_list);
 
   entity->tx_list         = NULL;

openair2/LAYER2/nr_rlc/nr_rlc_entity_tm.h

@@ -31,6 +31,10 @@ typedef struct {
   /* set to the latest know time by the user of the module. Unit: ms */
   uint64_t t_current;
 
+  /* deal with logging of buffer full */
+  uint64_t t_log_buffer_full;
+  int      sdu_rejected;
+
   /* tx management */
   nr_rlc_sdu_segment_t *tx_list;
   nr_rlc_sdu_segment_t *tx_end;