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Use spsc_q to process PRACH jobs

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Use two queues for PRACH processing:

- prach_ru_queue: pass jobs from TX thread (scheduler) to RU thread. For
  split 8, the RU thread itself handles PRACH processing; for split 7.2,
  it is the library that is responsible for handling PRACH messages (see
  oran_fh_if4p5_south_in())
- prach_l1rx_queue: after jobs have been handled in RU thread, use this
  queue to pass jobs to the RX thread. There, preamble detection is
  performed, and RACH.indication FAPI messages are filled if a preamble
  has been detected.

Together, these queues replace a linear search in a global array that
has been modified by three threads at the same time. The design ensures
that access now is thread-safe, and with less overhead.

Signed-off-by: Robert Schmidt <robert.schmidt@openairinterface.org>
This commit is contained in:
Robert Schmidt
2026-04-16 12:16:47 +02:00
parent 879e374d32
commit 03096dd495
11 changed files with 118 additions and 125 deletions
Download Patch File Download Diff File Expand all files Collapse all files
executables/nr-gnb.c
+6 -1
View File
@@ -161,7 +161,12 @@ static void rx_func(processingData_L1_t *info)
NR_UL_IND_t UL_INFO = {.frame = frame_rx, .slot = slot_rx, .module_id = gNB->Mod_id, .CC_id = gNB->CC_id};
// Do PRACH RU processing
UL_INFO.rach_ind.pdu_list = UL_INFO.prach_pdu_indication_list;
L1_nr_prach_procedures(gNB, frame_rx, slot_rx, &UL_INFO.rach_ind);
UL_INFO.rach_ind.number_of_pdus = 0;
// even if processing is late, we might collect all PRACH
// the last PRACH's frame/slot is when all UE's appear to have accessed
prach_item_t p;
while (spsc_q_get(&gNB->prach_l1rx_queue, &p, sizeof(p)))
L1_nr_prach_procedures(gNB, &p, &UL_INFO.rach_ind);
//WA: comment rotation in tx/rx
if (gNB->phase_comp) {
executables/nr-ru.c
+10 -4
View File
@@ -15,6 +15,7 @@
#include "common/utils/nr/nr_common.h"
#include "common/utils/assertions.h"
#include "common/utils/system.h"
#include "common/utils/fsn.h"
#include "common/ran_context.h"
#include "radio/COMMON/common_lib.h"
@@ -980,11 +981,16 @@ void *ru_thread(void *param)
proc->tti_rx * gNB->frame_parms.samples_per_slot_wCP);
// Do PRACH RU processing
prach_item_t *p =
find_nr_prach(&gNB->prach_list, proc->frame_rx, proc->tti_rx, gNB->frame_parms.nb_antennas_rx, NR_SEARCH_EXIST);
if (p) {
fsn_t now = {.f = proc->frame_rx, .s = proc->tti_rx, .mu = fp->numerology_index};
prach_item_t p;
while (get_next_nr_prach(&gNB->prach_ru_queue, &now, &p)) {
// need to extract RACH data for later processing by rx_nr_prach()
rx_nr_prach_ru(p, ru->common.rxdata, ru->nr_frame_parms, ru->N_TA_offset);
rx_nr_prach_ru(&p, ru->common.rxdata, ru->nr_frame_parms, ru->N_TA_offset);
bool success = spsc_q_put(&gNB->prach_l1rx_queue, &p, sizeof(p));
// assume prach_l1rx_queue never full: prach_ru_queue filled at
// constant pace, but prach_l1rx_queue emptied as fast as possible,
// see rx_func()
DevAssert(success);
} // end if (prach_id >= 0)
} // end if (ru->feprx)
} // end if (slot_type == NR_UPLINK_SLOT || slot_type == NR_MIXED_SLOT) {