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openairinterface5g/openair1/SCHED_NR/fapi_nr_l1.c
T
Raymond Knoppandkiran d52b81798b Introduce separate thread to handle gNB TX processing 
This commit introduces a separate thread (l1_tx_thread) that processes
gNB DL/TX slots. It receives a message from the ru_thread when a new
slot started, and starts processing.

The DL part of the scheduler is run in the l1_tx_thread.  Therefore,
only call UL indication (for scheduler) in UL slots.  The UL indication
previously triggered the DL scheduler -- hence, it had to be called in
every slot. Now, since the DL scheduler is moved into the DL thread, we
don't have to call the scheduler in every slot anymore.

The reorder thread is removed, as reordering with this scheme is not
necessary anymore.

The main advantage of this version is that the TX can be scheduled
earlier (sl_ahead). Further, there can no longer be race conditions in
the TX path, since the scheduler/L2, TX L1 processing and the RU tx
function are all execute in the same thread (L1_tX_thread).

Also, the scheduler prepares PRACH/PUSCH/PUCCH FAPI PDUs. As of this
commit, the scheduler runs in the TX processing chain, whereas these
PDUs are destined for RX processing.  Thus, too avoid data races,
instead of triggering the RX processing at the same time as TX
processing in the RU thread, this commit changes the code to trigger RX
processing after the scheduler has been run in TX processing to avoid
data races.

Finally, we synchronize RU and L1 threads. This is important for
rfsimulator, since unlike most radios, rfsimulator can run slower or
faster, depending on I/O and CPU (it does not have a stable "tick").

Co-authored-by: kiran <saikiran@iitj.ac.in>
2024-02-12 12:04:55 +01:00

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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/*! \file fapi_nr_l1.c
* \brief functions for FAPI L1 interface
* \author R. Knopp, WEI-TAI CHEN
* \date 2017, 2018
* \version 0.1
* \company Eurecom, NTUST
* \email: knopp@eurecom.fr, kroempa@gmail.com
* \note
* \warning
*/
#include "fapi_nr_l1.h"
#include "common/ran_context.h"
#include "PHY/NR_TRANSPORT/nr_transport_proto.h"
#include "PHY/NR_TRANSPORT/nr_dlsch.h"
#include "PHY/NR_TRANSPORT/nr_dci.h"
#include "nfapi/oai_integration/vendor_ext.h"
#include "openair2/NR_PHY_INTERFACE/nr_sched_response.h"
extern int oai_nfapi_dl_tti_req(nfapi_nr_dl_tti_request_t *dl_config_req);
extern int oai_nfapi_tx_data_req(nfapi_nr_tx_data_request_t *tx_data_req);
extern int oai_nfapi_ul_dci_req(nfapi_nr_ul_dci_request_t *ul_dci_req);
extern int oai_nfapi_ul_tti_req(nfapi_nr_ul_tti_request_t *ul_tti_req);
extern uint8_t nfapi_mode;
void handle_nr_nfapi_ssb_pdu(processingData_L1tx_t *msgTx,int frame,int slot,
nfapi_nr_dl_tti_request_pdu_t *dl_tti_pdu)
{
AssertFatal(dl_tti_pdu->ssb_pdu.ssb_pdu_rel15.bchPayloadFlag== 1, "bchPayloadFlat %d != 1\n",
dl_tti_pdu->ssb_pdu.ssb_pdu_rel15.bchPayloadFlag);
uint8_t i_ssb = dl_tti_pdu->ssb_pdu.ssb_pdu_rel15.SsbBlockIndex;
LOG_D(NR_PHY,"%d.%d : ssb index %d pbch_pdu: %x\n",frame,slot,i_ssb,dl_tti_pdu->ssb_pdu.ssb_pdu_rel15.bchPayload);
if (msgTx->ssb[i_ssb].active)
AssertFatal(1==0,"SSB PDU with index %d already active\n",i_ssb);
else {
msgTx->ssb[i_ssb].active = true;
memcpy((void*)&msgTx->ssb[i_ssb].ssb_pdu,&dl_tti_pdu->ssb_pdu,sizeof(dl_tti_pdu->ssb_pdu));
}
}
/*void handle_nr_nfapi_pdsch_pdu(PHY_VARS_gNB *gNB,int frame,int subframe,gNB_L1_rxtx_proc_t *proc,
uint8_t codeword_index,
uint8_t *sdu)
{
int UE_id = 0; //Hardcode UE_id for now
int harq_pid;
NR_gNB_DLSCH_t *dlsch0=NULL, *dlsch1=NULL;
NR_DL_gNB_HARQ_t *dlsch0_harq=NULL,*dlsch1_harq=NULL;
// Based on nr_fill_dci_and_dlsch only gNB->dlsch[0][0] gets filled now. So maybe we do not need dlsch1.
dlsch0 = gNB->dlsch[UE_id][0];
dlsch1 = gNB->dlsch[UE_id][1];
harq_pid = dlsch0->harq_ids[subframe];
dlsch0_harq = dlsch0->harq_processes[harq_pid];
dlsch1_harq = dlsch1->harq_processes[harq_pid];
//if (dlsch0_harq->round==0) { //get pointer to SDU if this a new SDU
if(sdu == NULL) {
LOG_E(PHY,"NFAPI: SFN/SF:%04d%d proc:TX:[frame %d subframe %d]: programming dlsch for round 0 \n",
frame,subframe,
proc->frame_tx,proc->slot_tx);
return;
}
//AssertFatal(sdu!=NULL,"NFAPI: SFN/SF:%04d%d proc:TX:[frame %d subframe %d]: programming dlsch for round 0, rnti %x, UE_id %d, harq_pid %d : sdu is null for pdu_index %d dlsch0_harq[round:%d SFN/SF:%d%d pdu:%p mcs:%d ndi:%d pdschstart:%d]\n",
// frame,subframe,
// proc->frame_tx,proc->subframe_tx,rel8->rnti,UE_id,harq_pid,
// dl_tti_pdu->pdsch_pdu.pdsch_pdu_rel8.pdu_index,dlsch0_harq->round,dlsch0_harq->frame,dlsch0_harq->subframe,dlsch0_harq->pdu,dlsch0_harq->mcs,dlsch0_harq->ndi,dlsch0_harq->pdsch_start);
if (codeword_index == 0) dlsch0_harq->pdu = sdu;
else dlsch1_harq->pdu = sdu;
LOG_I(PHY, "SFN/SF: %d/%d DLSCH PDU filled \n",frame, subframe);
// }
}*/
void handle_nfapi_nr_csirs_pdu(processingData_L1tx_t *msgTx, int frame, int slot, nfapi_nr_dl_tti_csi_rs_pdu *csirs_pdu)
{
int found = 0;
for (int id = 0; id < NR_SYMBOLS_PER_SLOT; id++) {
NR_gNB_CSIRS_t *csirs = &msgTx->csirs_pdu[id];
if (csirs->active == 0) {
LOG_D(NR_PHY,"Frame %d Slot %d CSI_RS with ID %d is now active\n",frame,slot,id);
csirs->active = 1;
memcpy((void*)&csirs->csirs_pdu, (void*)csirs_pdu, sizeof(nfapi_nr_dl_tti_csi_rs_pdu));
found = 1;
break;
}
}
if (found == 0)
LOG_E(MAC,"CSI-RS list is full\n");
}
void handle_nr_nfapi_pdsch_pdu(processingData_L1tx_t *msgTx,
nfapi_nr_dl_tti_pdsch_pdu *pdsch_pdu,
uint8_t *sdu)
{
nr_fill_dlsch(msgTx,pdsch_pdu,sdu);
}
void nr_schedule_response(NR_Sched_Rsp_t *Sched_INFO)
{
// copy data from L2 interface into L1 structures
module_id_t Mod_id = Sched_INFO->module_id;
nfapi_nr_dl_tti_request_t *DL_req = &Sched_INFO->DL_req;
nfapi_nr_tx_data_request_t *TX_req = &Sched_INFO->TX_req;
nfapi_nr_ul_tti_request_t *UL_tti_req = &Sched_INFO->UL_tti_req;
nfapi_nr_ul_dci_request_t *UL_dci_req = &Sched_INFO->UL_dci_req;
frame_t frame = Sched_INFO->frame;
sub_frame_t slot = Sched_INFO->slot;
AssertFatal(RC.gNB!=NULL,"RC.gNB is null\n");
AssertFatal(RC.gNB[Mod_id]!=NULL,"RC.gNB[%d] is null\n",Mod_id);
PHY_VARS_gNB *gNB = RC.gNB[Mod_id];
start_meas(&gNB->schedule_response_stats);
nfapi_nr_config_request_scf_t *cfg = &gNB->gNB_config;
int slot_type = nr_slot_select(cfg,frame,slot);
uint8_t number_dl_pdu = (DL_req==NULL) ? 0 : DL_req->dl_tti_request_body.nPDUs;
uint8_t number_ul_dci_pdu = (UL_dci_req==NULL) ? 0 : UL_dci_req->numPdus;
uint8_t number_ul_tti_pdu = (UL_tti_req==NULL) ? 0 : UL_tti_req->n_pdus;
uint8_t number_tx_data_pdu = (TX_req == NULL) ? 0 : TX_req->Number_of_PDUs;
if (NFAPI_MODE == NFAPI_MONOLITHIC){
if (slot_type == NR_DOWNLINK_SLOT || slot_type == NR_MIXED_SLOT) {
processingData_L1tx_t *msgTx=NULL;
msgTx = gNB->msgDataTx;
msgTx->num_pdsch_slot = 0;
msgTx->num_dl_pdcch = 0;
msgTx->num_ul_pdcch = number_ul_dci_pdu;
msgTx->slot = slot;
msgTx->frame = frame;
/* store the sched_response_id for the TX thread to release it when done */
msgTx->sched_response_id = Sched_INFO->sched_response_id;
for (int i=0;i<number_dl_pdu;i++) {
nfapi_nr_dl_tti_request_pdu_t *dl_tti_pdu = &DL_req->dl_tti_request_body.dl_tti_pdu_list[i];
LOG_D(NR_PHY,"NFAPI: dl_pdu %d : type %d\n",i,dl_tti_pdu->PDUType);
switch (dl_tti_pdu->PDUType) {
case NFAPI_NR_DL_TTI_SSB_PDU_TYPE:
handle_nr_nfapi_ssb_pdu(msgTx,frame,slot,
dl_tti_pdu);
break;
case NFAPI_NR_DL_TTI_PDCCH_PDU_TYPE:
LOG_D(NR_PHY,"frame %d, slot %d, Got NFAPI_NR_DL_TTI_PDCCH_PDU_TYPE for %d.%d\n",frame,slot,DL_req->SFN,DL_req->Slot);
msgTx->pdcch_pdu[msgTx->num_dl_pdcch] = dl_tti_pdu->pdcch_pdu;
msgTx->num_dl_pdcch++;
break;
case NFAPI_NR_DL_TTI_CSI_RS_PDU_TYPE:
LOG_D(NR_PHY,"frame %d, slot %d, Got NFAPI_NR_DL_TTI_CSI_RS_PDU_TYPE for %d.%d\n",frame,slot,DL_req->SFN,DL_req->Slot);
handle_nfapi_nr_csirs_pdu(msgTx,frame,slot,&dl_tti_pdu->csi_rs_pdu);
break;
case NFAPI_NR_DL_TTI_PDSCH_PDU_TYPE:
LOG_D(NR_PHY,"frame %d, slot %d, Got NFAPI_NR_DL_TTI_PDSCH_PDU_TYPE for %d.%d\n",frame,slot,DL_req->SFN,DL_req->Slot);
nfapi_nr_dl_tti_pdsch_pdu_rel15_t *pdsch_pdu_rel15 = &dl_tti_pdu->pdsch_pdu.pdsch_pdu_rel15;
uint16_t pduIndex = pdsch_pdu_rel15->pduIndex;
AssertFatal(TX_req->pdu_list[pduIndex].num_TLV == 1, "TX_req->pdu_list[%d].num_TLV %d != 1\n",
pduIndex,TX_req->pdu_list[pduIndex].num_TLV);
uint8_t *sdu = (uint8_t *)TX_req->pdu_list[pduIndex].TLVs[0].value.direct;
AssertFatal(msgTx->num_pdsch_slot < gNB->max_nb_pdsch,
"Number of PDSCH PDUs %d exceeded the limit %d\n",
msgTx->num_pdsch_slot,
gNB->max_nb_pdsch);
handle_nr_nfapi_pdsch_pdu(msgTx,&dl_tti_pdu->pdsch_pdu, sdu);
}
}
for (int i=0; i<number_ul_dci_pdu; i++)
msgTx->ul_pdcch_pdu[i] = UL_dci_req->ul_dci_pdu_list[i];
/* Both the current thread and the TX thread will access the sched_info
* at the same time, so increase its reference counter, so that it is
* released only when both threads are done with it.
*/
inc_ref_sched_response(Sched_INFO->sched_response_id);
}
for (int i = 0; i < number_ul_tti_pdu; i++) {
switch (UL_tti_req->pdus_list[i].pdu_type) {
case NFAPI_NR_UL_CONFIG_PUSCH_PDU_TYPE:
LOG_D(NR_PHY,"frame %d, slot %d, Got NFAPI_NR_UL_TTI_PUSCH_PDU_TYPE for %d.%d\n", frame, slot, UL_tti_req->SFN, UL_tti_req->Slot);
nr_fill_ulsch(gNB,UL_tti_req->SFN, UL_tti_req->Slot, &UL_tti_req->pdus_list[i].pusch_pdu);
break;
case NFAPI_NR_UL_CONFIG_PUCCH_PDU_TYPE:
LOG_D(NR_PHY,"frame %d, slot %d, Got NFAPI_NR_UL_TTI_PUCCH_PDU_TYPE for %d.%d\n", frame, slot, UL_tti_req->SFN, UL_tti_req->Slot);
nr_fill_pucch(gNB,UL_tti_req->SFN, UL_tti_req->Slot, &UL_tti_req->pdus_list[i].pucch_pdu);
break;
case NFAPI_NR_UL_CONFIG_PRACH_PDU_TYPE:
LOG_D(NR_PHY,"frame %d, slot %d, Got NFAPI_NR_UL_TTI_PRACH_PDU_TYPE for %d.%d\n", frame, slot, UL_tti_req->SFN, UL_tti_req->Slot);
nfapi_nr_prach_pdu_t *prach_pdu = &UL_tti_req->pdus_list[i].prach_pdu;
nr_fill_prach(gNB, UL_tti_req->SFN, UL_tti_req->Slot, prach_pdu);
if (gNB->RU_list[0]->if_south == LOCAL_RF ||
gNB->RU_list[0]->if_south == REMOTE_IF5) nr_fill_prach_ru(gNB->RU_list[0], UL_tti_req->SFN, UL_tti_req->Slot, prach_pdu);
break;
case NFAPI_NR_UL_CONFIG_SRS_PDU_TYPE:
LOG_D(NR_PHY,"frame %d, slot %d, Got NFAPI_NR_UL_CONFIG_SRS_PDU_TYPE for %d.%d\n", frame, slot, UL_tti_req->SFN, UL_tti_req->Slot);
nr_fill_srs(gNB,UL_tti_req->SFN, UL_tti_req->Slot, &UL_tti_req->pdus_list[i].srs_pdu);
break;
}
}
}
if (NFAPI_MODE == NFAPI_MODE_VNF) { //If VNF, oai_nfapi functions send respective p7 msgs to PNF for which nPDUs is greater than 0
if(number_ul_tti_pdu>0)
oai_nfapi_ul_tti_req(UL_tti_req);
if (number_ul_dci_pdu>0)
oai_nfapi_ul_dci_req(UL_dci_req);
if (number_tx_data_pdu>0)
oai_nfapi_tx_data_req(TX_req);
if (number_dl_pdu>0)
oai_nfapi_dl_tti_req(DL_req);
}
/* this thread is done with the sched_info, decrease the reference counter */
if (slot_type == NR_DOWNLINK_SLOT || slot_type == NR_MIXED_SLOT) {
LOG_D(NR_PHY, "Calling dref_sched_response for id %d in %d.%d (sched_response)\n", Sched_INFO->sched_response_id, frame, slot);
deref_sched_response(Sched_INFO->sched_response_id);
}
stop_meas(&gNB->schedule_response_stats);
}
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