Introduce slot indication tick to run (DL) scheduler

The next commit introduces a separate gNB TX processing thread. To
properly separate DL scheduler (for scheduling decisions) from UL
indication handling (for UL packets), this commit introduces a slot
indication "tick" to run the DL scheduler which will be put into the gNB
TX processing chain instead of the UL indication.

executables/nr-gnb.c

@@ -52,6 +52,8 @@
 #include "PHY/MODULATION/nr_modulation.h"
 #include "PHY/NR_TRANSPORT/nr_dlsch.h"
 #include "openair2/NR_PHY_INTERFACE/nr_sched_response.h"
+#include "LAYER2/NR_MAC_COMMON/nr_mac_extern.h"
+#include "LAYER2/NR_MAC_gNB/mac_proto.h"
 
 #undef MALLOC //there are two conflicting definitions, so we better make sure we don't use it at all
 //#undef FRAME_LENGTH_COMPLEX_SAMPLES //there are two conflicting definitions, so we better make sure we don't use it at all

openair2/NR_PHY_INTERFACE/NR_IF_Module.c

@@ -385,12 +385,49 @@ static void match_crc_rx_pdu(nfapi_nr_rx_data_indication_t *rx_ind, nfapi_nr_crc
   }
 }
 
+static void run_scheduler(module_id_t module_id, int CC_id, int frame, int slot)
+{
+  NR_IF_Module_t *ifi = nr_if_inst[module_id];
+  // gNB_MAC_INST     *mac        = RC.nrmac[module_id];
+
+  NR_Sched_Rsp_t *sched_info;
+  LOG_D(NR_MAC, "Calling scheduler for %d.%d\n", frame, slot);
+  sched_info = allocate_sched_response();
+
+  // clear UL DCI prior to handling ULSCH
+  sched_info->UL_dci_req.numPdus = 0;
+  gNB_dlsch_ulsch_scheduler(module_id, frame, slot, sched_info);
+  ifi->CC_mask = 0;
+  sched_info->module_id = module_id;
+  sched_info->CC_id = CC_id;
+  sched_info->frame = frame;
+  sched_info->slot = slot;
+  /*
+  sched_info->DL_req      = &mac->DL_req[CC_id];
+  sched_info->UL_dci_req  = &mac->UL_dci_req[CC_id];
+
+  sched_info->UL_tti_req  = mac->UL_tti_req[CC_id];
+
+  sched_info->TX_req      = &mac->TX_req[CC_id];
+  */
+#ifdef DUMP_FAPI
+  dump_dl(sched_info);
+#endif
+
+  AssertFatal(ifi->NR_Schedule_response != NULL, "nr_schedule_response is null (mod %d, cc %d)\n", module_id, CC_id);
+  ifi->NR_Schedule_response(sched_info);
+
+  LOG_D(NR_PHY,
+        "NR_Schedule_response: SFN SLOT:%d %d dl_pdus:%d\n",
+        sched_info->frame,
+        sched_info->slot,
+        sched_info->DL_req.dl_tti_request_body.nPDUs);
+}
+
 void NR_UL_indication(NR_UL_IND_t *UL_info) {
   AssertFatal(UL_info!=NULL,"UL_info is null\n");
-  module_id_t      module_id   = UL_info->module_id;
-  int              CC_id       = UL_info->CC_id;
-  NR_Sched_Rsp_t   *sched_info;
-  NR_IF_Module_t   *ifi        = nr_if_inst[module_id];
+  module_id_t module_id = UL_info->module_id;
+  int CC_id = UL_info->CC_id;
 
   LOG_D(NR_PHY,"SFN/SLOT:%d.%d module_id:%d CC_id:%d UL_info[rach_pdus:%zu rx_ind:%zu crcs:%zu]\n",
         UL_info->frame, UL_info->slot,
@@ -449,56 +486,20 @@ void NR_UL_indication(NR_UL_IND_t *UL_info) {
   if (get_softmodem_params()->emulate_l1) {
     free_unqueued_nfapi_indications(rach_ind, uci_ind, rx_ind, crc_ind);
   }
-  if (NFAPI_MODE != NFAPI_MODE_PNF) {
-    gNB_MAC_INST     *mac        = RC.nrmac[module_id];
-    if (ifi->CC_mask==0) {
-      ifi->current_frame    = UL_info->frame;
-      ifi->current_slot = UL_info->slot;
-    } else {
-      AssertFatal(UL_info->frame != ifi->current_frame,"CC_mask %x is not full and frame has changed\n",ifi->CC_mask);
-      AssertFatal(UL_info->slot != ifi->current_slot,"CC_mask %x is not full and slot has changed\n",ifi->CC_mask);
-    }
-
-    ifi->CC_mask |= (1<<CC_id);
-
-    if (ifi->CC_mask == ((1<<MAX_NUM_CCs)-1)) {
-      /*
-      eNB_dlsch_ulsch_scheduler(module_id,
-          (UL_info->frame+((UL_info->slot>(9-sl_ahead))?1:0)) % 1024,
-          (UL_info->slot+sl_ahead)%10);
-      */
-      nfapi_nr_config_request_scf_t *cfg = &mac->config[CC_id];
-      int spf = get_spf(cfg);
-      sched_info = allocate_sched_response();
-      // clear UL DCI prior to handling ULSCH
-      sched_info->UL_dci_req.numPdus = 0;
-      gNB_dlsch_ulsch_scheduler(module_id,
-                                (UL_info->frame + ((UL_info->slot > (spf - 1 - ifi->sl_ahead)) ? 1 : 0)) % 1024,
-                                (UL_info->slot + ifi->sl_ahead) % spf,
-                                sched_info);
-
-      ifi->CC_mask            = 0;
-      sched_info->module_id   = module_id;
-      sched_info->CC_id       = CC_id;
-      sched_info->frame       = (UL_info->frame + ((UL_info->slot>(spf-1-ifi->sl_ahead)) ? 1 : 0)) % 1024;
-      sched_info->slot        = (UL_info->slot+ifi->sl_ahead)%spf;
 
-#ifdef DUMP_FAPI
-      dump_dl(sched_info);
-#endif
-
-      AssertFatal(ifi->NR_Schedule_response!=NULL,
-                  "nr_schedule_response is null (mod %d, cc %d)\n",
-                  module_id,
-                  CC_id);
-      ifi->NR_Schedule_response(sched_info);
-
-      LOG_D(NR_PHY,
-            "NR_Schedule_response: SFN SLOT:%d %d dl_pdus:%d\n",
-            sched_info->frame,
-            sched_info->slot,
-            sched_info->DL_req.dl_tti_request_body.nPDUs);
-    }
+  if (NFAPI_MODE != NFAPI_MODE_PNF) {
+    gNB_MAC_INST *mac = RC.nrmac[module_id];
+
+    NR_IF_Module_t *ifi = nr_if_inst[module_id];
+    ifi->current_frame = UL_info->frame;
+    ifi->current_slot = UL_info->slot;
+
+    nfapi_nr_config_request_scf_t *cfg = &mac->config[CC_id];
+    int spf = get_spf(cfg);
+    int CC_id = 0;
+    int frame_tx = UL_info->frame + ((UL_info->slot > (spf - 1 - ifi->sl_ahead)) ? 1 : 0);
+    int slot_tx = (UL_info->slot + ifi->sl_ahead) % spf;
+    ifi->NR_slot_indication(module_id, CC_id, frame_tx, slot_tx);
   }
 }
 
@@ -514,6 +515,7 @@ NR_IF_Module_t *NR_IF_Module_init(int Mod_id) {
 
     nr_if_inst[Mod_id]->CC_mask=0;
     nr_if_inst[Mod_id]->NR_UL_indication = NR_UL_indication;
+    nr_if_inst[Mod_id]->NR_slot_indication = run_scheduler;
     AssertFatal(pthread_mutex_init(&nr_if_inst[Mod_id]->if_mutex,NULL)==0,
                 "allocation of nr_if_inst[%d]->if_mutex fails\n",Mod_id);
   }

openair2/NR_PHY_INTERFACE/NR_IF_Module.h

@@ -113,6 +113,7 @@ typedef struct NR_IF_Module_s {
   //define the function pointer
   void (*NR_UL_indication)(NR_UL_IND_t *UL_INFO);
   void (*NR_Schedule_response)(NR_Sched_Rsp_t *Sched_INFO);
+  void (*NR_slot_indication)(module_id_t module_idP, int CC_id, int frame, int slot);
   void (*NR_PHY_config_req)(NR_PHY_Config_t *config_INFO);
   uint32_t CC_mask;
   uint16_t current_frame;