api: vat2 and json autogeneration for api messages

VAT2: A completely auto-generated replacement of VAT.
Reads input message in JSON from stdin and outputs received messages in JSON.

A VAT2 plugin is automatically built for a .api file.
There no longer a need for a separate _test.c.

Example:
vat2 show_version {}
{
        "_msgname":     "show_version_reply",
        "retval":       0,
        "program":      "vpe",
        "version":      "21.01-rc0~411-gf6eb348a6",
        "build_date":   "2020-11-19T09:49:25",
        "build_directory":      "/vpp/autogen3"
}

vat2 sw_interface_dump '{"sw_if_index": -1,
                         "name_filter_valid": 0,
                         "name_filter": ""}'
[{
                "_msgname":     "sw_interface_details",
                "sw_if_index":  0,
                "sup_sw_if_index":      0,
                "l2_address":   "00:00:00:00:00:00",
                "flags":        "Invalid ENUM",
                "type": "IF_API_TYPE_HARDWARE",
                "link_duplex":  "LINK_DUPLEX_API_UNKNOWN",
                "link_speed":   0,
                "link_mtu":     0,
                "mtu":  [0, 0, 0, 0],
                "sub_id":       0,
                "sub_number_of_tags":   0,
                "sub_outer_vlan_id":    0,
                "sub_inner_vlan_id":    0,
                "sub_if_flags": "Invalid ENUM",
                "vtr_op":       0,
                "vtr_push_dot1q":       0,
                "vtr_tag1":     0,
                "vtr_tag2":     0,
                "outer_tag":    0,
                "b_dmac":       "00:00:00:00:00:00",
                "b_smac":       "00:00:00:00:00:00",
                "b_vlanid":     0,
                "i_sid":        0,
                "interface_name":       "local0",
                "interface_dev_type":   "local",
                "tag":  ""
        }]

This is the first phase and vat2 is not integrated in packaging yet.

Type: feature
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: Ib45ddeafb180ea7da8c5dc274a9274d7a4edc876
Signed-off-by: Ole Troan <ot@cisco.com>

3 files changed, 57 insertions, 2 deletions

diff --git a/src/cmake/api.cmake b/src/cmake/api.cmake
index fe2cad6bc46..f3af68748d6 100644
--- a/src/cmake/api.cmake
+++ b/src/cmake/api.cmake
@@ -23,13 +23,32 @@ function(vpp_generate_api_c_header file)
   if (VPP_INCLUDE_DIR)
     set(includedir "--includedir" ${VPP_INCLUDE_DIR})
   endif()
-  add_custom_command (OUTPUT ${output_name}
+
+  set(OUTPUT_HEADERS
+    "${CMAKE_CURRENT_BINARY_DIR}/${file}.h"
+    "${CMAKE_CURRENT_BINARY_DIR}/${file}_fromjson.h"
+    "${CMAKE_CURRENT_BINARY_DIR}/${file}_tojson.h"
+    "${CMAKE_CURRENT_BINARY_DIR}/${file}_enum.h"
+    "${CMAKE_CURRENT_BINARY_DIR}/${file}_types.h"
+    "${CMAKE_CURRENT_BINARY_DIR}/${file}.c"
+    "${CMAKE_CURRENT_BINARY_DIR}/${file}_test.c"
+    "${CMAKE_CURRENT_BINARY_DIR}/${file}_test2.c"
+  )
+
+  add_custom_command (
+    OUTPUT ${OUTPUT_HEADERS}
     COMMAND mkdir -p ${output_dir}
     COMMAND ${VPP_APIGEN}
     ARGS ${includedir} --includedir ${CMAKE_SOURCE_DIR} --input ${CMAKE_CURRENT_SOURCE_DIR}/${file} --outputdir ${output_dir} --output ${output_name}
     DEPENDS ${VPP_APIGEN} ${CMAKE_CURRENT_SOURCE_DIR}/${file}
     COMMENT "Generating API header ${output_name}"
   )
+  get_filename_component(barename ${file} NAME)
+  set(t ${barename}_deps)
+  if (NOT TARGET ${t})
+    add_custom_target(${t} ALL DEPENDS ${OUTPUT_HEADERS})
+    add_dependencies(api_headers ${t})
+  endif()
 endfunction()
 
 function(vpp_generate_api_json_header file dir component)
diff --git a/src/cmake/library.cmake b/src/cmake/library.cmake
index a5b6c76d2d1..3f17e30daab 100644
--- a/src/cmake/library.cmake
+++ b/src/cmake/library.cmake
@@ -57,6 +57,8 @@ macro(add_vpp_library lib)
 	FILES ${file} ${CMAKE_CURRENT_BINARY_DIR}/${file}.h
 	${CMAKE_CURRENT_BINARY_DIR}/${file}_enum.h
 	${CMAKE_CURRENT_BINARY_DIR}/${file}_types.h
+	${CMAKE_CURRENT_BINARY_DIR}/${file}_tojson.h
+	${CMAKE_CURRENT_BINARY_DIR}/${file}_fromjson.h
 	DESTINATION include/${lib}/${dir}
 	COMPONENT vpp-dev
       )
@@ -93,3 +95,33 @@ function (add_vpp_headers path)
     )
   endforeach()
 endfunction()
+
+macro(add_vpp_test_library lib)
+  cmake_parse_arguments(TEST
+    ""
+    ""
+    ${ARGN}
+  )
+
+  foreach(file ${ARGN})
+    get_filename_component(name ${file} NAME_WE)
+    set(test_lib ${lib}_${name}_plugin)
+    add_library(${test_lib} SHARED ${file}_test2.c)
+    if(NOT VPP_EXTERNAL_PROJECT)
+      add_dependencies(${test_lib} api_headers)
+    endif()
+    include_directories(${CMAKE_CURRENT_BINARY_DIR})
+    set_target_properties(${test_lib} PROPERTIES NO_SONAME 1)
+    set_target_properties(${test_lib} PROPERTIES
+      PREFIX ""
+      LIBRARY_OUTPUT_DIRECTORY ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/vat2_plugins)
+
+    # Later: Install and package
+    # install .so
+    #install(
+    #  TARGETS ${test_lib}
+    #  DESTINATION ${VPP_LIBRARY_DIR}/vat2_plugins
+    #  #COMPONENT ${ARG_COMPONENT}
+    #  )
+  endforeach()
+endmacro()
diff --git a/src/cmake/plugin.cmake b/src/cmake/plugin.cmake
index 2aae89510c1..c165b5914dc 100644
--- a/src/cmake/plugin.cmake
+++ b/src/cmake/plugin.cmake
@@ -15,7 +15,7 @@ macro(add_vpp_plugin name)
   cmake_parse_arguments(PLUGIN
     ""
     "LINK_FLAGS;COMPONENT;DEV_COMPONENT"
-    "SOURCES;API_FILES;MULTIARCH_SOURCES;LINK_LIBRARIES;INSTALL_HEADERS;API_TEST_SOURCES"
+    "SOURCES;API_FILES;MULTIARCH_SOURCES;LINK_LIBRARIES;INSTALL_HEADERS;API_TEST_SOURCES;"
     ${ARGN}
   )
   set(plugin_name ${name}_plugin)
@@ -99,6 +99,10 @@ macro(add_vpp_plugin name)
       COMPONENT ${PLUGIN_COMPONENT}
     )
   endif()
+  if (PLUGIN_API_FILES)
+    add_vpp_test_library(${name}_test_plugin ${PLUGIN_API_FILES})
+  endif()
+
   install(
     TARGETS ${plugin_name}
     DESTINATION ${VPP_LIBRARY_DIR}/vpp_plugins