Merge remote-tracking branch 'origin/remove-old-cuda-ldpc' into integration_2026_w13 (!4007)

Remove old CUDA LDPC implementation

A new implementation is under way in !3955. To simplify the MR, remove the old
LDPC CUDA implementation in a first step.

ci-scripts/xml_files/gnb_usrp_build.xml

@@ -44,7 +44,7 @@
     <class>Build_eNB</class>
     <desc>Build gNB (USRP)</desc>
     <node>caracal</node>
-    <Build_eNB_args>--gNB -w USRP --ninja -c -P --build-lib ldpc_cuda --build-lib ldpc_aal --cmake-opt -DASN1C_EXEC=/opt/asn1c/bin/asn1c --cmake-opt -DPHYSIM_CHECK_FILES="ThresholdsOffload.cmake"</Build_eNB_args>
+    <Build_eNB_args>--gNB -w USRP --ninja -c -P --build-lib ldpc_aal --cmake-opt -DASN1C_EXEC=/opt/asn1c/bin/asn1c --cmake-opt -DPHYSIM_CHECK_FILES="ThresholdsOffload.cmake"</Build_eNB_args>
   </testCase>
 
 </testCaseList>

cmake_targets/build_oai

@@ -40,7 +40,7 @@ HWs=""
 BUILD_DIR=ran_build
 CMAKE_BUILD_TYPE="RelWithDebInfo"
 CMAKE_CMD="$CMAKE"
-OPTIONAL_LIBRARIES="telnetsrv enbscope uescope nrscope ldpc_cuda ldpc_aal ldpc_xdma websrv oai_iqplayer imscope imscope_record"
+OPTIONAL_LIBRARIES="telnetsrv enbscope uescope nrscope ldpc_aal ldpc_xdma websrv oai_iqplayer imscope imscope_record"
 TARGET_LIST=""
 BUILD_TOOL_OPT="-j$(nproc)"
 

doc/BUILD.md

@@ -171,7 +171,6 @@ The following libraries are build in CI and should always work: `telnetsrv`,
 
 Some libraries have further dependencies and might not build on every system:
 - `enbscope`, `uescope`, `nrscope`: libforms/X
-- `ldpc_cuda`: CUDA
 - `websrv`: npm and others
 - `ldpc_aal`: DPDK with patch
 

openair1/PHY/CODING/CMakeLists.txt

@@ -31,41 +31,6 @@ add_dependencies(nr_ulschsim ldpc ldpc_orig)
 add_dependencies(nr_dlsim ldpc ldpc_orig)
 add_dependencies(nr_dlschsim ldpc ldpc_orig)
 
-##############################################
-# Base CUDA setting
-##############################################
-
-add_boolean_option(ENABLE_LDPC_CUDA OFF "Build support for CUDA" OFF)
-if (ENABLE_LDPC_CUDA)
-  find_package(CUDA REQUIRED)
-  if (NOT CUDA_FOUND)
-    message(FATAL_ERROR "no CUDA found")
-  endif()
-  SET(CUDA_NVCC_FLAG "${CUDA_NVCC_FLAGS};-arch=sm_60;")
-  SET(CUDA_VERBOSE_BUILD ON)
-  cuda_add_library(ldpc_cuda MODULE
-                   nrLDPC_decoder_LYC/nrLDPC_decoder_LYC.cu
-                   nrLDPC_encoder/ldpc_encoder_optim8segmulti.c
-                   # The slot coding layer cannot be linked with
-                   # target_link_libraries like above
-                   # because of cuda_add_library
-                   # which already uses target_link_libraries
-                   nrLDPC_coding/nrLDPC_coding_segment/nrLDPC_coding_segment_decoder.c
-                   nrLDPC_coding/nrLDPC_coding_segment/nrLDPC_coding_segment_encoder.c
-                   nrLDPC_coding/nrLDPC_coding_segment/nr_rate_matching.c
-  )
-  set_target_properties(ldpc_cuda PROPERTIES CUDA_SEPARABLE_COMPILATION ON)
-  set_target_properties(ldpc_cuda PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
-
-  add_dependencies(ldpctest ldpc_cuda)
-  add_dependencies(nr-softmodem ldpc_cuda)
-  add_dependencies(nr-uesoftmodem ldpc_cuda)
-  add_dependencies(nr_ulsim ldpc_cuda)
-  add_dependencies(nr_ulschsim ldpc_cuda)
-  add_dependencies(nr_dlsim ldpc_cuda)
-  add_dependencies(nr_dlschsim ldpc_cuda)
-endif()
-
 add_library(crc_byte OBJECT crc_byte.c)
 
 add_subdirectory(nrLDPC_coding)

openair1/PHY/CODING/DOC/LDPCImplementation.md

@@ -110,10 +110,10 @@ A mechanism to select ldpc implementation is also available in the `ldpctest` ph
 
 #### Examples of ldpc shared lib selection when running ldpctest:
 
-Loading libldpc_cuda.so, the cuda implementation of the ldpc decoder:
+Loading libldpc_orig.so, the legacy implementation of the ldpc decoder:
 
 ```
-$ ./ldpctest -v _cuda
+$ ./ldpctest -v _orig
 ```
 
 ### LDPC libraries
@@ -124,6 +124,4 @@ Libraries implementing the LDPC algorithms must be named `libldpc<_version>.so`,
 * `LDPCdecoder` implementing type `LDPC_decoderfunc_t *`
 * `LDPCencoder` implementing type `LDPC_encoderfunc_t *`
 
-`libldpc_cuda.so` has been tested with the `ldpctest` executable, usage from the softmodem's has to be tested.
-
 [oai Wikis home](https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/home)

openair1/PHY/CODING/TESTBENCH/ldpctest.c

@@ -30,7 +30,6 @@
 #include "common/utils/load_module_shlib.h"
 #include "PHY/CODING/nrLDPC_extern.h"
 // #include "openair1/SIMULATION/NR_PHY/nr_unitary_defs.h"
-#include "openair1/PHY/CODING/nrLDPC_decoder_LYC/nrLDPC_decoder_LYC.h"
 #include "openair1/PHY/defs_nr_common.h"
 #include "coding_unitary_defs.h"
 #include "common/utils/LOG/log.h"

openair1/PHY/CODING/nrLDPC_decoder_LYC/nrLDPC_decoder_LYC.h

-#ifndef __NR_LDPC_DECODER_LYC__H__
-#define __NR_LDPC_DECODER_LYC__H__
-
-
-/*! \file PHY/CODING/nrLDPC_decoder_LYC/nrLDPC_decoder_LYC.h
- * \brief LDPC cuda support BG1 all length
- * \author NCTU OpinConnect Terng-Yin Hsu,WEI-YING,LIN
- * \email tyhsu@cs.nctu.edu.tw
- * \date 13-05-2020
- * \version 
- * \note
- * \warning
- */
- 
-
-/***
-   \brief LDPC decoder
-   \param p_decParams LDPC decoder parameters
-   \param p_llr Input LLRs
-   \param p_llrOut Output vector
-   \param p_profiler LDPC profiler statistics
-****/
-
-int32_t nrLDPC_decoder_LYC(t_nrLDPC_dec_params* p_decParams, int8_t* p_llr, int8_t* p_out, int block_length, time_stats_t *time_decoder);
-
-
-void init_LLR_DMA_for_CUDA(t_nrLDPC_dec_params* p_decParams, int8_t* p_llr, int8_t* p_out, int block_length);
-
-void warmup_for_GPU(void);
-
-void set_compact_BG(int Zc, short BG);
-
-
-#endif