cmake: Find DPDK via pkg-config, if available

Debian uses pkg-config without the libdpdk.so linker script. Use
the pkg-config file to grab the installed libraries and determine
what to link to.

1 files changed, 55 insertions, 25 deletions

diff --git a/host/cmake/Modules/FindDPDK.cmake b/host/cmake/Modules/FindDPDK.cmake
index a5029b94c..90240e61d 100644
--- a/host/cmake/Modules/FindDPDK.cmake
+++ b/host/cmake/Modules/FindDPDK.cmake
@@ -1,12 +1,13 @@
 #
 # Copyright 2018 Ettus Research, a National Instruments Company
+# Copyright 2020 Ettus Research, a National Instruments Brand
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 #
 # - Find DPDK
 # Find the DPDK includes and client library
 # This module defines
-#  DPDK_INCLUDE_DIR, where to find rte_config.h
+#  DPDK_INCLUDE_DIRS, where to find rte_config.h and rte_version.h
 #  DPDK_LIBRARIES, the libraries needed by a DPDK user
 #  DPDK_FOUND, If false, do not try to use DPDK.
 # also defined, but not for general use are
@@ -14,46 +15,75 @@
 
 include(FindPackageHandleStandardArgs)
 
-find_path ( DPDK_INCLUDE_CONFIG_DIR rte_config.h
-    PATHS ENV RTE_INCLUDE
-    PATH_SUFFIXES dpdk
-)
+function(DPDK_READ_VERSION DPDK_VERSION DPDK_INCLUDE_DIRS)
+    if(NOT DPDK_INCLUDE_DIRS)
+        return()
+    endif()
+
+    file(READ "${DPDK_INCLUDE_DIRS}/rte_version.h"
+        DPDK_VERSION_STR
+    )
+    string(REGEX MATCH "#define RTE_VER_YEAR ([0-9]+)" _ ${DPDK_VERSION_STR})
+    set(DPDK_VERSION_MAJOR ${CMAKE_MATCH_1})
+
+    string(REGEX MATCH "#define RTE_VER_MONTH ([0-9]+)" _ ${DPDK_VERSION_STR})
+    set(DPDK_VERSION_MINOR ${CMAKE_MATCH_1})
 
-find_path ( DPDK_INCLUDE_ETHDEV_DIR rte_ethdev.h
+    set(DPDK_VERSION "${DPDK_VERSION_MAJOR}.${DPDK_VERSION_MINOR}" PARENT_SCOPE)
+endfunction()
+
+if(DPDK_LIBRARIES AND DPDK_INCLUDE_DIRS)
+    set(DPDK_USER_PROVIDED ON)
+else()
+    set(DPDK_USER_PROVIDED OFF)
+endif()
+
+find_package(PkgConfig)
+PKG_CHECK_MODULES(PC_DPDK QUIET libdpdk>=18.11)
+
+find_path (DPDK_VERSION_INCLUDE_DIR rte_version.h
+    HINTS ${PC_DPDK_INCLUDE_DIRS}
     PATHS ENV RTE_INCLUDE
     PATH_SUFFIXES dpdk
 )
-
-find_path ( DPDK_INCLUDE_VERSION_DIR rte_version.h
+find_path (DPDK_CONFIG_INCLUDE_DIR rte_config.h
+    HINTS ${PC_DPDK_INCLUDE_DIRS}
     PATHS ENV RTE_INCLUDE
     PATH_SUFFIXES dpdk
 )
 
-set(DPDK_INCLUDE_DIR ${DPDK_INCLUDE_CONFIG_DIR} ${DPDK_INCLUDE_ETHDEV_DIR})
-list(REMOVE_DUPLICATES DPDK_INCLUDE_DIR)
-
+# Check for linker script that pulls in the APIs
 find_library(DPDK_LIBRARY
+    dpdk
+    HINTS ${PC_DPDK_LIBDIR}
     PATHS $ENV{RTE_SDK_DIR}/$ENV{RTE_TARGET}/lib
 )
 
-list(APPEND DPDK_LIBRARIES dpdk)
+if(NOT DPDK_USER_PROVIDED)
+    set(DPDK_INCLUDE_DIRS ${PC_DPDK_INCLUDE_DIRS})
+    list(APPEND DPDK_INCLUDE_DIRS ${DPDK_VERSION_INCLUDE_DIR})
+    list(APPEND DPDK_INCLUDE_DIRS ${DPDK_CONFIG_INCLUDE_DIR})
+    list(REMOVE_DUPLICATES DPDK_INCLUDE_DIRS)
+endif()
 
-if(DPDK_INCLUDE_VERSION_DIR)
-    file(READ "${DPDK_INCLUDE_VERSION_DIR}/rte_version.h"
-        DPDK_VERSION_STR
-    )
-    
-    string(REGEX MATCH "#define RTE_VER_YEAR ([0-9]+)" _ ${DPDK_VERSION_STR})
-    set(DPDK_VERSION_MAJOR ${CMAKE_MATCH_1})
-    
-    string(REGEX MATCH "#define RTE_VER_MONTH ([0-9]+)" _ ${DPDK_VERSION_STR})
-    set(DPDK_VERSION_MINOR ${CMAKE_MATCH_1})
-endif(DPDK_INCLUDE_VERSION_DIR)
+if(DPDK_USER_PROVIDED)
+    DPDK_READ_VERSION(DPDK_VERSION ${DPDK_INCLUDE_DIRS})
+else()
+    set(DPDK_LIBRARIES ${PC_DPDK_LIBRARIES})
 
+    if(DPDK_LIBRARY)
+        list(APPEND DPDK_LIBRARIES ${DPDK_LIBRARY})
+        list(REMOVE_DUPLICATES DPDK_LIBRARIES)
+    endif()
 
-set(DPDK_VERSION "${DPDK_VERSION_MAJOR}.${DPDK_VERSION_MINOR}")
+    if(PC_DPDK_FOUND)
+        set(DPDK_VERSION ${PC_DPDK_VERSION})
+    else()
+        DPDK_READ_VERSION(DPDK_VERSION ${DPDK_INCLUDE_DIRS})
+    endif(PC_DPDK_FOUND)
+endif()
 
 find_package_handle_standard_args(DPDK
-    REQUIRED_VARS DPDK_INCLUDE_DIR DPDK_LIBRARIES
+    REQUIRED_VARS DPDK_INCLUDE_DIRS DPDK_LIBRARIES
     VERSION_VAR DPDK_VERSION
 )