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Refactor code to wait for free RX job

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Some radios (e.g., RFsim) can run faster. A mechanism has been put in
place to keep RX/TX frame/slot numbers not too far from each other.
Refactor in a separate function with documentation to make this clearer.
This commit is contained in:
Robert Schmidt
2025-02-13 09:17:01 +01:00
parent 540d918a09
commit 99c849c249
1 changed files with 44 additions and 28 deletions
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executables/nr-ru.c
+44 -28
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@@ -1084,6 +1084,48 @@ void ru_tx_func(void *param)
}//else emulate_rf
}
/* @brief wait for the next RX TTI to be free
*
* Certain radios, e.g., RFsim, can run faster than real-time. This might
* create problems, e.g., if RX and TX get too far from each other. This
* function ensures that a maximum of 4 RX slots are processed at a time (and
* not more than those four are started).
*
* Through the queue L1_rx_out, we are informed about completed RX jobs.
* rx_tti_busy keeps track of individual slots that have been started; this
* function blocks until the current frame/slot is completed, signaled through
* a message.
*
* @param L1_rx_out the queue from which to read completed RX jobs
* @param rx_tti_busy array to mark RX job completion
* @param frame_rx the frame to wait for
* @param slot_rx the slot to wait for
*/
static bool wait_free_rx_tti(notifiedFIFO_t *L1_rx_out, bool rx_tti_busy[RU_RX_SLOT_DEPTH], int frame_rx, int slot_rx)
{
int idx = slot_rx % RU_RX_SLOT_DEPTH;
if (rx_tti_busy[idx]) {
bool not_done = true;
LOG_D(NR_PHY, "%d.%d Waiting to access RX slot %d\n", frame_rx, slot_rx, idx);
// block and wait for frame_rx/slot_rx free from previous slot processing.
// as we can get other slots, we loop on the queue
while (not_done) {
notifiedFIFO_elt_t *res = pullNotifiedFIFO(L1_rx_out);
if (!res)
return false;
processingData_L1_t *info = NotifiedFifoData(res);
LOG_D(NR_PHY, "%d.%d Got access to RX slot %d.%d (%d)\n", frame_rx, slot_rx, info->frame_rx, info->slot_rx, idx);
rx_tti_busy[info->slot_rx % RU_RX_SLOT_DEPTH] = false;
if ((info->slot_rx % RU_RX_SLOT_DEPTH) == idx)
not_done = false;
delNotifiedFIFO_elt(res);
}
}
// set the tti to busy: the caller will process this slot now
rx_tti_busy[idx] = true;
return true;
}
void *ru_thread(void *param)
{
static int ru_thread_status;
@@ -1250,34 +1292,8 @@ void *ru_thread(void *param)
int slot_type = nr_slot_select(&ru->config, proc->frame_rx, proc->tti_rx);
if (slot_type == NR_UPLINK_SLOT || slot_type == NR_MIXED_SLOT) {
if (ru->feprx) {
if (rx_tti_busy[proc->tti_rx % RU_RX_SLOT_DEPTH]) {
bool not_done = true;
LOG_D(NR_PHY, "%d.%d Waiting to access RX slot %d\n", proc->frame_rx, proc->tti_rx, proc->tti_rx % RU_RX_SLOT_DEPTH);
// now we block and wait our slot memory zone is freed from previous slot processing
// as we can get other slots ending, we loop on the queue
notifiedFIFO_elt_t *res = NULL;
while (not_done) {
res = pullNotifiedFIFO(&gNB->L1_rx_out);
if (!res)
break;
processingData_L1_t *info = (processingData_L1_t *)NotifiedFifoData(res);
LOG_D(NR_PHY,
"%d.%d Got access to RX slot %d.%d (%d)\n",
proc->frame_rx,
proc->tti_rx,
info->frame_rx,
info->slot_rx,
proc->tti_rx % RU_RX_SLOT_DEPTH);
rx_tti_busy[info->slot_rx % RU_RX_SLOT_DEPTH] = false;
if ((info->slot_rx % RU_RX_SLOT_DEPTH) == (proc->tti_rx % RU_RX_SLOT_DEPTH))
not_done = false;
delNotifiedFIFO_elt(res);
}
if (!res)
break;
}
// set the tti that was generated to busy
rx_tti_busy[proc->tti_rx % RU_RX_SLOT_DEPTH] = true;
if (!wait_free_rx_tti(&gNB->L1_rx_out, rx_tti_busy, proc->frame_rx, proc->tti_rx))
break; // nothing to wait for: we have to stop
ru->feprx(ru,proc->tti_rx);
LOG_D(NR_PHY, "Setting %d.%d (%d) to busy\n", proc->frame_rx, proc->tti_rx, proc->tti_rx % RU_RX_SLOT_DEPTH);
//LOG_M("rxdata.m","rxs",ru->common.rxdata[0],1228800,1,1);