nr rlc: speedup ack/nack reception

The code completely changed, expect problems.

openair2/LAYER2/nr_rlc/nr_rlc_entity_am.h

@@ -84,9 +84,6 @@ typedef struct {
   nr_rlc_sdu_segment_t *wait_end;
 
   nr_rlc_sdu_segment_t *retransmit_list;
-  nr_rlc_sdu_segment_t *retransmit_end;
-
-  nr_rlc_sdu_segment_t *ack_list;
 } nr_rlc_entity_am_t;
 
 void nr_rlc_entity_am_recv_sdu(nr_rlc_entity_t *entity,

openair2/LAYER2/nr_rlc/nr_rlc_sdu.c

@@ -58,14 +58,19 @@ oom:
   exit(1);
 }
 
-void nr_rlc_free_sdu_segment(nr_rlc_sdu_segment_t *sdu)
+int nr_rlc_free_sdu_segment(nr_rlc_sdu_segment_t *sdu)
 {
-  sdu->sdu->ref_count--;
-  if (sdu->sdu->ref_count == 0) {
+  int ret = 0;
+
+  sdu->sdu->free_count++;
+  if (sdu->sdu->free_count == sdu->sdu->ref_count) {
     free(sdu->sdu->data);
     free(sdu->sdu);
+    ret = 1;
   }
   free(sdu);
+
+  return ret;
 }
 
 void nr_rlc_sdu_segment_list_append(nr_rlc_sdu_segment_t **list,

openair2/LAYER2/nr_rlc/nr_rlc_sdu.h

@@ -30,6 +30,10 @@ typedef struct nr_rlc_sdu_t {
   int retx_count;
 
   int ref_count;      /* incremented each time the SDU is segmented */
+  int free_count;     /* incremented each time a segment is freed
+                       * when it equals ref_count we can free the SDU
+                       * completely
+                       */
 } nr_rlc_sdu_t;
 
 typedef struct nr_rlc_sdu_segment_t {
@@ -44,7 +48,8 @@ typedef struct nr_rlc_sdu_segment_t {
 nr_rlc_sdu_segment_t *nr_rlc_new_sdu(
     char *buffer, int size,
     int upper_layer_id);
-void nr_rlc_free_sdu_segment(nr_rlc_sdu_segment_t *sdu);
+/* return 1 if the SDU has been freed too, 0 if not (more segments to free) */
+int nr_rlc_free_sdu_segment(nr_rlc_sdu_segment_t *sdu);
 void nr_rlc_sdu_segment_list_append(nr_rlc_sdu_segment_t **list,
                                     nr_rlc_sdu_segment_t **end,
                                     nr_rlc_sdu_segment_t *sdu);