nr rlc: reduce "buffer full" log

openair2/LAYER2/nr_rlc/nr_rlc_entity_am.c

@@ -1596,9 +1596,18 @@ void nr_rlc_entity_am_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, "%s:%d:%s: warning: %d SDU rejected, SDU buffer full\n",
+          __FILE__, __LINE__, __FUNCTION__,
+          entity->sdu_rejected);
+    entity->sdu_rejected = 0;
+    entity->t_log_buffer_full = entity->t_current;
+  }
+
   if (entity->tx_size + size > entity->tx_maxsize) {
-    LOG_E(RLC, "%s:%d:%s: warning: SDU rejected, SDU buffer full\n",
-          __FILE__, __LINE__, __FUNCTION__);
+    entity->sdu_rejected++;
     return;
   }
 
@@ -1827,6 +1836,9 @@ static void clear_entity(nr_rlc_entity_am_t *entity)
 
   entity->t_current = 0;
 
+  entity->t_log_buffer_full = 0;
+  entity->sdu_rejected      = 0;
+
   entity->t_poll_retransmit_start = 0;
   entity->t_reassembly_start      = 0;
   entity->t_status_prohibit_start = 0;

openair2/LAYER2/nr_rlc/nr_rlc_entity_am.h

@@ -60,6 +60,10 @@ 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;
+
   /* timers (stores the TTI of activation, 0 means not active) */
   uint64_t t_poll_retransmit_start;
   uint64_t t_reassembly_start;