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Refactor TUN Interface Management and Move to SDAP Layer

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This commit refactors the TUN interface management by moving its creation
and configuration from the PDCP layer to the SDAP layer for UE.

Key changes include:

- Introduced `tun_generate_ue_ifname` and `tun_destroy` functions for better
  TUN interface lifecycle management.
- Added support for creating and destroying UE-specific TUN interfaces in SDAP.
- Refactored `nr_pdcp_module_init` to remove TUN-related logic and moved it
  to SDAP.
- Updated NAS and SDAP layers to handle PDU session-specific TUN interface
  creation and configuration.
- Enhanced SDAP entity management to include TUN socket handling and thread
  lifecycle.
- Updated NAS message handling to initialize default PDU session TUN
  interfaces in NOS1 mode.
- Use a single SDAP thread function for gNB and UE
- Allow noS1 mode also in SA on gNB

These changes improve modularity by isolating TUN interface management within
the SDAP layer, aligning with the 3GPP architecture, and simplifying the PDCP
layer.

Co-Authored-By: Robert Schmidt <robert.schmidt@openairinterface.org>
This commit is contained in:
Bartosz Podrygajlo
2025-02-17 13:12:48 +01:00
parent f3eb713084
commit 1ab8a58a2f
17 changed files with 238 additions and 272 deletions
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25
executables/nr-uesoftmodem.c
View File

@@ -301,25 +301,10 @@ void init_openair0()
static void init_pdcp(int ue_id)
{
uint32_t pdcp_initmask = (!IS_SOFTMODEM_NOS1) ? LINK_ENB_PDCP_TO_GTPV1U_BIT : LINK_ENB_PDCP_TO_GTPV1U_BIT;
/*if (IS_SOFTMODEM_RFSIM || (nfapi_getmode()==NFAPI_UE_STUB_PNF)) {
pdcp_initmask = pdcp_initmask | UE_NAS_USE_TUN_BIT;
}*/
// previous code was:
// if (IS_SOFTMODEM_NOKRNMOD)
// pdcp_initmask = pdcp_initmask | UE_NAS_USE_TUN_BIT;
// The kernel module (KRNMOD) has been removed from the project, so the 'if'
// was removed but the flag 'pdcp_initmask' was kept, as "no kernel module"
// was always set. further refactoring could take it out
pdcp_initmask = pdcp_initmask | UE_NAS_USE_TUN_BIT;
if (get_softmodem_params()->nsa && nr_rlc_module_init(0) != 0) {
LOG_I(RLC, "Problem at RLC initiation \n");
}
nr_pdcp_layer_init();
nr_pdcp_module_init(pdcp_initmask, ue_id);
}
// Stupid function addition because UE itti messages queues definition is common with eNB
@@ -449,6 +434,11 @@ int main(int argc, char **argv)
}
}
if (create_tasks_nrue(1) < 0) {
printf("cannot create ITTI tasks\n");
exit(-1); // need a softer mode
}
int mode_offset = get_softmodem_params()->nsa ? NUMBER_OF_UE_MAX : 1;
uint16_t node_number = get_softmodem_params()->node_number;
ue_id_g = (node_number == 0) ? 0 : node_number - 2;
@@ -557,11 +547,6 @@ int main(int argc, char **argv)
// wait for end of program
printf("TYPE <CTRL-C> TO TERMINATE\n");
if (create_tasks_nrue(1) < 0) {
printf("cannot create ITTI tasks\n");
exit(-1); // need a softer mode
}
// Sleep a while before checking all parameters have been used
// Some are used directly in external threads, asynchronously
sleep(2);