Add nr_dlbench: standalone DL scheduler + PHY TX benchmark

Assisted-by: Claude-Code:Opus-4.8
Signed-off-by: Maxime Elkael <m.elkael@northeastern.edu>

tests/CMakeLists.txt

@@ -3,3 +3,4 @@
 add_subdirectory(nr-cuup)
 add_subdirectory(nr-cu-nrppa)
 add_subdirectory(nr-ue-nas-simulator)
+add_subdirectory(nrdlbench)

tests/nrdlbench/CMakeLists.txt

+# nr_dlbench: standalone gNB DL-scheduler + PHY-TX micro-benchmark.
+# Lives under tests/ (not openair1/SIMULATION/NR_PHY) because it drives the full
+# MAC scheduler path, not just the PHY.
+add_executable(nr_dlbench
+  dlbench.c
+  ${PHY_INTERFACE_DIR}/queue_t.c
+  )
+target_link_libraries(nr_dlbench PRIVATE
+  -Wl,--start-group UTIL SIMU PHY_NR_COMMON PHY_NR SCHED_NR_LIB MAC_NR_COMMON CONFIG_LIB L2_NR -Wl,--end-group
+  m pthread ${T_LIB} ITTI dl physim_common
+  softmodem_common
+  )
+target_link_libraries(nr_dlbench PRIVATE asn1_nr_rrc_hdrs asn1_lte_rrc_hdrs)
+
+if(ENABLE_TESTS)
+  add_dependencies(tests nr_dlbench)
+  # Functional smoke tests via a wrapper script (room to grow richer checks):
+  # run a short benchmark in UM and AM (-A) modes and verify it completes.
+  add_test(NAME nr_dlbench_um_functional_test
+           COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/nr-dlbench-functional-test.sh $<TARGET_FILE:nr_dlbench> -A 0)
+  add_test(NAME nr_dlbench_am_functional_test
+           COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/nr-dlbench-functional-test.sh $<TARGET_FILE:nr_dlbench> -A 50)
+endif()

tests/nrdlbench/nr-dlbench-functional-test.sh

+#!/bin/bash
+# SPDX-License-Identifier: LicenseRef-CSSL-1.0
+
+# usage: nr-dlbench-functional-test.sh <nr_dlbench-binary> [extra nr_dlbench args]
+
+if [ $# -lt 1 ]; then
+  echo "usage: $0 <nr_dlbench-binary> [extra nr_dlbench args]"
+  exit 1
+fi
+
+BIN=$1
+shift
+
+# Small, fast config: 1 UE, 24 RBs (10 MHz, the minimum that fits a CORESET),
+# 200 slots. Caller-supplied args (e.g. -A <depth> for AM mode) are appended.
+set -x
+OUT=$("${BIN}" -u 1 -R 24 -n 200 -L 0 "$@" 2>&1)
+RET=$?
+set +x
+
+echo "${OUT}"
+
+if [ ${RET} -ne 0 ]; then
+  echo "FAIL: nr_dlbench exited with code ${RET}"
+  exit 1
+fi
+if ! echo "${OUT}" | grep -q "=== Results"; then
+  echo "FAIL: no results summary in nr_dlbench output"
+  exit 1
+fi
+echo "PASS"
+exit 0