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Introduce separate thread to handle gNB TX processing

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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>
This commit is contained in:
Raymond Knopp
2024-02-12 12:04:55 +01:00
committed by Robert Schmidt
co-authored by kiran
parent fb69d9c635
commit d52b81798b
16 changed files with 228 additions and 283 deletions
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executables/softmodem-common.h
+1 -7
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@@ -44,7 +44,6 @@ extern "C"
example: -1,3 launches two working threads one floating, the second set on core 3\n\
default 8 floating threads\n\
use N for no pool (runs in calling thread) recommended with rfsim.\n"
#define CONFIG_HLP_REORDER "Disable reorder thread\n"
#define CONFIG_HLP_ULMAXE "set the eNodeB max ULSCH erros\n"
#define CONFIG_HLP_CALUER "set UE RX calibration\n"
#define CONFIG_HLP_CALUERM ""
@@ -147,7 +146,6 @@ extern "C"
#define NID2 softmodem_params.nid2
#define LDPC_OFFLOAD_FLAG softmodem_params.ldpc_offload_flag
#define REORDER_THREAD_DISABLE softmodem_params.reorder_thread_disable
#define DEFAULT_RFCONFIG_FILE "/usr/local/etc/syriq/ue.band7.tm1.PRB100.NR40.dat";
extern int usrp_tx_thread;
@@ -155,7 +153,6 @@ extern int usrp_tx_thread;
#define CMDLINE_PARAMS_DESC { \
{"rf-config-file", CONFIG_HLP_RFCFGF, 0, .strptr=&RF_CONFIG_FILE, .defstrval=NULL, TYPE_STRING, 0}, \
{"thread-pool", CONFIG_HLP_TPOOL, 0, .strptr=&TP_CONFIG, .defstrval="-1,-1,-1,-1,-1,-1,-1,-1", TYPE_STRING, 0}, \
{"reorder-thread-disable",CONFIG_HLP_REORDER, PARAMFLAG_BOOL, .iptr=&REORDER_THREAD_DISABLE, .defintval=0, TYPE_INT, 0}, \
{"phy-test", CONFIG_HLP_PHYTST, PARAMFLAG_BOOL, .iptr=&PHY_TEST, .defintval=0, TYPE_INT, 0}, \
{"do-ra", CONFIG_HLP_DORA, PARAMFLAG_BOOL, .iptr=&DO_RA, .defintval=0, TYPE_INT, 0}, \
{"sa", CONFIG_HLP_SA, PARAMFLAG_BOOL, .iptr=&SA, .defintval=0, TYPE_INT, 0}, \
@@ -232,7 +229,6 @@ extern int usrp_tx_thread;
{ .s5 = { NULL } }, \
{ .s5 = { NULL } }, \
{ .s5 = { NULL } }, \
{ .s5 = { NULL } }, \
{ .s3a = { config_checkstr_assign_integer, \
{"MONOLITHIC", "PNF", "VNF","UE_STUB_PNF","UE_STUB_OFFNET","STANDALONE_PNF"}, \
{NFAPI_MONOLITHIC, NFAPI_MODE_PNF, NFAPI_MODE_VNF,NFAPI_UE_STUB_PNF,NFAPI_UE_STUB_OFFNET,NFAPI_MODE_STANDALONE_PNF}, \
@@ -326,8 +322,7 @@ typedef struct {
uint64_t optmask;
//THREAD_STRUCT thread_struct;
char *rf_config_file;
char *threadPoolConfig;
int reorder_thread_disable;
char *threadPoolConfig;
int phy_test;
int do_ra;
int sa;
@@ -375,7 +370,6 @@ extern uint16_t sl_ahead;
extern uint16_t sf_ahead;
extern int oai_exit;
void tx_func(void *param);
void rx_func(void *param);
void ru_tx_func(void *param);
extern uint8_t nfapi_mode;