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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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radio/fhi_72/oran_isolate.c
+17 -5
View File
@@ -12,6 +12,7 @@
#include "xran_sync_api.h"
#include "common/utils/LOG/log.h"
#include "common/utils/fsn.h"
#include "openair1/PHY/defs_gNB.h"
#include "openair1/PHY/NR_TRANSPORT/nr_transport_proto.h"
#include "oaioran.h"
@@ -205,19 +206,21 @@ void oran_fh_if4p5_south_in(RU_t *ru, int *frame, int *slot)
.prach_buf = NULL,
};
prach_item_t *prach_id = find_nr_prach(&ru->gNB_list[0]->prach_list, *frame, *slot, ru->nr_frame_parms->nb_antennas_rx, SEARCH_EXIST);
if (prach_id) {
prach_item_t p;
PHY_VARS_gNB *gNB = ru->gNB_list[0];
fsn_t now = {.f = *frame, .s = *slot, .mu = gNB->frame_parms.numerology_index};
if (get_next_nr_prach(&gNB->prach_ru_queue, &now, &p)) {
struct xran_fh_config *fh_cfg = get_xran_fh_config(0);
int slots_per_subframe = 1 << fh_cfg->frame_conf.nNumerology;
uint32_t subframe = *slot / slots_per_subframe; // `slot` = slot in which PRACH is received
// PRACH occasion in a frame if and only if SFN % x == y, TS 38.211 Table 6.3.3.2-2/3/4
nr_prach_info_t prach_info = get_prach_info(0);
bool is_prach_frame = (*frame % prach_info.x == prach_info.y);
bool is_prach_slot = is_prach_frame && xran_is_prach_slot(0, subframe, (prach_id->slot % slots_per_subframe)); // `prach_id->slot` = slot in which PRACH is scheduled
bool is_prach_slot = is_prach_frame && xran_is_prach_slot(0, subframe, (p.slot % slots_per_subframe)); // `p.slot` = slot in which PRACH is scheduled
if (is_prach_slot) {
ru_info.prach_buf = prach_id->prach_buf;
ru_info.prach_buf = p.prach_buf;
} else {
LOG_W(HW, "[%d.%d] Expected PRACH reception of scheduled slot %d\n", *frame, *slot, prach_id->slot);
LOG_W(HW, "[%d.%d] Expected PRACH reception of scheduled slot %d\n", *frame, *slot, p.slot);
}
}
@@ -232,6 +235,15 @@ void oran_fh_if4p5_south_in(RU_t *ru, int *frame, int *slot)
printf("ORAN: %d.%d ORAN_fh_if4p5_south_in ERROR in RX function \n", f, sl);
}
if (ru_info.prach_buf) {
// xran_fh_rx_read_slot() should have read PRACH, write back to queue
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);
}
int slots_per_frame = 10 << (ru->openair0_cfg.nr_scs_for_raster);
proc->tti_rx = sl;
proc->frame_rx = f;