Move radio CMakeLists.txt to subdirectory

- move following radios: AW2S, BladeRF, IRIS, LMSSDR, RFsimulator, USRP
- move following transports: Ethernet, benetel4g, benetel5g
- for each: create independent cmake variable to switch compilation
  on/off, in order: OAI_AW2S, OAI_BLADERF, OAI_IRIS, OAI_LMSSDR,
  OAI_SIMU, OAI_USRP, OAI_ETHERNET, OAI_BENETEL4G, OAI_BENETEL5G
- Remove RF_BOARD variable, allows to compile multiple boards at once
- where applicable: remove USERSPACE/LIB in path, i.e., move files up to
  directories, as all are userspace libraries

Note that with the above, it is now mandatory to enable a radio
implementation before compiling it, e.g., for USRP:

./build_oai -w USRP
cmake .. -DOAI_USRP=ON && ninja oai_usrpdevif

radio/ETHERNET/CMakeLists.txt

@@ -0,0 +1,9 @@
+add_library(oai_eth_transpro MODULE
+            ethernet_lib.c
+            eth_udp.c
+            eth_raw.c
+)
+target_include_directories(oai_eth_transpro PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+set_target_properties(oai_eth_transpro PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
+
+add_subdirectory(benetel)

radio/ETHERNET/benetel/4g/CMakeLists.txt

@@ -0,0 +1,17 @@
+pkg_check_modules(libdpdk REQUIRED libdpdk=20.05.0)
+
+add_library(benetel_4g MODULE
+            benetel.c
+            shared_buffers.c
+            low.c
+            low_dpdk.c
+            dpdk_driver.c
+)
+
+target_compile_definitions(benetel_4g PROPERTIES COMPILE_FLAGS "-fvisibility=hidden -I$ENV{RTE_SDK}/$ENV{RTE_TARGET}/include")
+
+SET(DPDK_LIBS "-Wl,-rpath,$ENV{RTE_SDK}/$ENV{RTE_TARGET}/lib -Wl,--whole-archive -L$ENV{RTE_SDK}/$ENV{RTE_TARGET}/lib -ldpdk -Wl,--no-whole-archive")
+target_include_directories(benetel_4g PRIVATE ${libdpdk_INCLUDE_DIRS})
+target_link_libraries(benetel_4g PRIVATE ${libdpdk_LIBRARIES})
+target_link_libraries(benetel_4g PRIVATE pthread dl rt m numa)
+set_target_properties(benetel_4g PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})

radio/ETHERNET/benetel/5g/CMakeLists.txt

@@ -0,0 +1,16 @@
+pkg_check_modules(libdpdk REQUIRED libdpdk=20.05.0)
+
+add_library(benetel_5g MODULE
+            benetel.c
+            shared_buffers.c
+            low.c
+            low_dpdk.c
+            dpdk_driver.c
+)
+
+SET(DPDK_LIBS "-Wl,-rpath,$ENV{RTE_SDK}/$ENV{RTE_TARGET}/lib -Wl,--whole-archive -L$ENV{RTE_SDK}/$ENV{RTE_TARGET}/lib -ldpdk -Wl,--no-whole-archive")
+target_include_directories(benetel_5g PRIVATE ${libdpdk_INCLUDE_DIRS})
+target_link_libraries(benetel_5g PRIVATE ${libdpdk_LIBRARIES})
+target_link_libraries(benetel_5g PRIVATE pthread dl rt m numa)
+set_target_properties(benetel_5g PROPERTIES COMPILE_FLAGS "-fvisibility=hidden -I$ENV{RTE_SDK}/$ENV{RTE_TARGET}/include")
+set_target_properties(benetel_5g PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})

radio/ETHERNET/benetel/CMakeLists.txt

@@ -0,0 +1,9 @@
+add_boolean_option(OAI_BENETEL4G OFF "Activate OAI's Benetel 4G radio driver" OFF)
+if(OAI_BENETEL4G)
+  add_subdirectory(4g)
+endif()
+
+add_boolean_option(OAI_BENETEL5G OFF "Activate OAI's Benetel 5G radio driver" OFF)
+if(OAI_BENETEL5G)
+  add_subdirectory(5g)
+endif()

radio/ETHERNET/if_defs.h

@@ -19,7 +19,7 @@
  *      contact@openairinterface.org
  */
 
-/*! \file radio/ETHERNET/USERSPACE/LIB/if_defs.h
+/*! \file radio/ETHERNET/if_defs.h
 * \brief 
 * \author S. Sandeep Kumar, Raymond Knopp
 * \date 2016