Look up Cell by Cell ID

Currently, we are still limited to one Cell by DU, hence looking up a
cell comes down to looking up a DU.

openair2/RRC/NR/rrc_gNB_du.c

@@ -486,6 +486,18 @@ nr_rrc_du_container_t *get_du_by_assoc_id(gNB_RRC_INST *rrc, sctp_assoc_t assoc_
   return RB_FIND(rrc_du_tree, &rrc->dus, &e);
 }
 
+/* \brief find DU by cell ID. Note: currently the CU is limited to one cell per
+ * DU, hence here, DU == cell. Modify this to look up a specific cell. */
+nr_rrc_du_container_t *get_du_by_cell_id(gNB_RRC_INST *rrc, uint64_t cell_id)
+{
+  nr_rrc_du_container_t *du = NULL;
+  RB_FOREACH(du, rrc_du_tree, &rrc->dus) {
+    if (cell_id == du->setup_req->cell[0].info.nr_cellid)
+      return du;
+  }
+  return NULL;
+}
+
 void dump_du_info(const gNB_RRC_INST *rrc, FILE *f)
 {
   fprintf(f, "%ld connected DUs \n", rrc->num_dus);

openair2/RRC/NR/rrc_gNB_du.h

@@ -41,6 +41,7 @@ void rrc_gNB_process_f1_du_configuration_update(struct f1ap_gnb_du_configuration
 struct nr_rrc_du_container_t *get_du_for_ue(struct gNB_RRC_INST_s *rrc, uint32_t ue_id);
 struct nr_rrc_du_container_t *get_du_by_assoc_id(struct gNB_RRC_INST_s *rrc, sctp_assoc_t assoc_id);
 const struct f1ap_served_cell_info_t *get_cell_information_by_phycellId(int phyCellId);
+struct nr_rrc_du_container_t *get_du_by_cell_id(struct gNB_RRC_INST_s *rrc, uint64_t cell_id);
 
 void dump_du_info(const struct gNB_RRC_INST_s *rrc, FILE *f);