f1ap,du_mgr: populate slices information in F1 setup request

Author: herlesupreeth

include/srsran/f1ap/du/f1ap_du_connection_manager.h

@@ -16,6 +16,7 @@
 #include "srsran/ran/gnb_du_id.h"
 #include "srsran/ran/nr_cgi.h"
 #include "srsran/ran/pci.h"
+#include "srsran/ran/s_nssai.h"
 #include "srsran/ran/subcarrier_spacing.h"
 #include "srsran/support/async/async_task.h"
 #include <optional>
@@ -35,6 +36,7 @@ struct f1_cell_setup_params {
   byte_buffer                          packed_meas_time_cfg;
   byte_buffer                          packed_mib;
   byte_buffer                          packed_sib1;
+  std::vector<s_nssai_t>               slices;
 };
 
 /// \brief Message that initiates a F1 Setup procedure.

lib/du_manager/converters/f1ap_configuration_helpers.cpp

@@ -642,6 +642,9 @@ void srsran::srs_du::fill_f1_setup_request(f1_setup_request_message&
     serv_cell.duplx_mode = cell_cfg.tdd_ul_dl_cfg_common.has_value() ? duplex_mode::TDD : duplex_mode::FDD;
     serv_cell.scs_common = cell_cfg.scs_common;
     serv_cell.dl_carrier = cell_cfg.dl_carrier;
+    for (const auto& slice : cell_cfg.rrm_policy_members) {
+      serv_cell.slices.push_back(slice.rrc_member.s_nssai);
+    }
     if (serv_cell.duplx_mode == duplex_mode::FDD) {
       serv_cell.ul_carrier = cell_cfg.ul_carrier;
     }

lib/f1ap/du/procedures/f1ap_du_setup_procedure.cpp

@@ -101,6 +101,19 @@ void f1ap_du_setup_procedure::send_f1_setup_request()
     auto plmn_bytes                                    = cell_cfg.nr_cgi.plmn_id.to_bytes();
     f1ap_cell.served_cell_info.served_plmns[0].plmn_id = plmn_bytes;
 
+    // Fill slicing information.
+    f1ap_cell.served_cell_info.served_plmns[0].ie_exts_present                        = not cell_cfg.slices.empty();
+    f1ap_cell.served_cell_info.served_plmns[0].ie_exts.tai_slice_support_list_present = not cell_cfg.slices.empty();
+    for (const s_nssai_t& s_nssai : cell_cfg.slices) {
+      slice_support_item_s slice{};
+      slice.snssai.sst.from_number(s_nssai.sst);
+      slice.snssai.sd_present = s_nssai.sd.has_value();
+      if (slice.snssai.sd_present) {
+        slice.snssai.sd.from_number(*s_nssai.sd);
+      }
+      f1ap_cell.served_cell_info.served_plmns[0].ie_exts.tai_slice_support_list.push_back(slice);
+    }
+
     // Fill Served Cell Information.
     f1ap_cell.served_cell_info.nr_pci         = cell_cfg.pci;
     f1ap_cell.served_cell_info.nr_cgi.plmn_id = plmn_bytes;