Trigger Reestablishment via resetting RLC sequence numbers

Plugin can trigger reestablishment (on DU)
and show counters of reestablishment (on CU)

openair2/LAYER2/nr_rlc/nr_rlc_oai_api.c

@@ -1010,6 +1010,24 @@ rlc_op_status_t rrc_rlc_remove_ue (const protocol_ctxt_t* const x)
   return RLC_OP_STATUS_OK;
 }
 
+/* This function is for testing purposes. At least on a COTS UE, it will
+ * trigger a reestablishment. */
+void nr_rlc_test_trigger_reestablishment(int rnti)
+{
+  nr_rlc_manager_lock(nr_rlc_ue_manager);
+  nr_rlc_ue_t *ue = nr_rlc_manager_get_ue(nr_rlc_ue_manager, rnti);
+  if (ue == NULL) {
+    nr_rlc_manager_unlock(nr_rlc_ue_manager);
+    LOG_E(RLC, "Cannot find RLC entity for UE %04x\n", rnti);
+    return;
+  }
+  /* we simply assume the SRB exists, because the scheduler creates it as soon
+   * as the UE context is created. */
+  nr_rlc_entity_t *ent = ue->srb[0];
+  ent->reestablishment(ent);
+  nr_rlc_manager_unlock(nr_rlc_ue_manager);
+}
+
 void nr_rlc_tick(int frame, int subframe)
 {
   if (frame != nr_rlc_current_time_last_frame ||

openair2/LAYER2/nr_rlc/nr_rlc_oai_api.h

@@ -44,6 +44,9 @@ void nr_rlc_add_drb(int rnti, int drb_id, const NR_RLC_BearerConfig_t *rlc_Beare
 
 void nr_rlc_remove_ue(int rnti);
 
+/* test function for CI to trigger reestablishments */
+void nr_rlc_test_trigger_reestablishment(int rnti);
+
 int nr_rlc_get_available_tx_space(
   const rnti_t            rntiP,
   const logical_chan_id_t channel_idP);