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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
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executables/nr-gnb.c
+6 -1
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@@ -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) {