1 .. SPDX-License-Identifier: BSD-3-Clause
2 Copyright(c) 2010-2015 Intel Corporation.
4 .. _linux_gsg_compiling_dpdk:
6 Compiling the DPDK Target from Source
7 =====================================
11 Parts of this process can also be done using the setup script described in
12 the :ref:`linux_setup_script` section of this document.
14 Uncompress DPDK and Browse Sources
15 ----------------------------------
17 First, uncompress the archive and move to the uncompressed DPDK source directory:
19 .. code-block:: console
21 tar xJf dpdk-<version>.tar.xz
24 The DPDK is composed of several directories:
26 * lib: Source code of DPDK libraries
28 * drivers: Source code of DPDK poll-mode drivers
30 * app: Source code of DPDK applications (automatic tests)
32 * examples: Source code of DPDK application examples
34 * config, buildtools, mk: Framework-related makefiles, scripts and configuration
36 Compiling and Installing DPDK System-wide
37 -----------------------------------------
39 DPDK can be configured, built and installed on your system using the tools
40 ``meson`` and ``ninja``.
44 The older makefile-based build system used in older DPDK releases is
45 still present and its use is described in section
46 `Installation of DPDK Target Environment using Make`_.
51 To configure a DPDK build use:
53 .. code-block:: console
57 where "build" is the desired output build directory, and "<options>" can be
58 empty or one of a number of meson or DPDK-specific build options, described
59 later in this section. The configuration process will finish with a summary
60 of what DPDK libraries and drivers are to be built and installed, and for
61 each item disabled, a reason why that is the case. This information can be
62 used, for example, to identify any missing required packages for a driver.
64 Once configured, to build and then install DPDK system-wide use:
66 .. code-block:: console
73 The last two commands above generally need to be run as root,
74 with the `ninja install` step copying the built objects to their final system-wide locations,
75 and the last step causing the dynamic loader `ld.so` to update its cache to take account of the new objects.
79 On some linux distributions, such as Fedora or Redhat, paths in `/usr/local` are
80 not in the default paths for the loader. Therefore, on these
81 distributions, `/usr/local/lib` and `/usr/local/lib64` should be added
82 to a file in `/etc/ld.so.conf.d/` before running `ldconfig`.
85 Adjusting Build Options
86 ~~~~~~~~~~~~~~~~~~~~~~~
88 DPDK has a number of options that can be adjusted as part of the build configuration process.
89 These options can be listed by running ``meson configure`` inside a configured build folder.
90 Many of these options come from the "meson" tool itself and can be seen documented on the
91 `Meson Website <https://mesonbuild.com/Builtin-options.html>`_.
93 For example, to change the build-type from the default, "debugoptimized",
94 to a regular "debug" build, you can either:
96 * pass ``-Dbuildtype=debug`` or ``--buildtype=debug`` to meson when configuring the build folder initially
98 * run ``meson configure -Dbuildtype=debug`` inside the build folder after the initial meson run.
100 Other options are specific to the DPDK project but can be adjusted similarly.
101 To set the "max_lcores" value to 256, for example, you can either:
103 * pass ``-Dmax_lcores=256`` to meson when configuring the build folder initially
105 * run ``meson configure -Dmax_lcores=256`` inside the build folder after the initial meson run.
107 Some of the DPDK sample applications in the `examples` directory can be
108 automatically built as part of a meson build too.
109 To do so, pass a comma-separated list of the examples to build to the
110 `-Dexamples` meson option as below::
112 meson -Dexamples=l2fwd,l3fwd build
114 As with other meson options, this can also be set post-initial-config using `meson configure` in the build directory.
115 There is also a special value "all" to request that all example applications whose
116 dependencies are met on the current system are built.
117 When `-Dexamples=all` is set as a meson option, meson will check each example application to see if it can be built,
118 and add all which can be built to the list of tasks in the ninja build configuration file.
120 Building Applications Using Installed DPDK
121 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
123 When installed system-wide, DPDK provides a pkg-config file ``libdpdk.pc`` for applications to query as part of their build.
124 It's recommended that the pkg-config file be used, rather than hard-coding the parameters (cflags/ldflags)
125 for DPDK into the application build process.
127 An example of how to query and use the pkg-config file can be found in the ``Makefile`` of each of the example applications included with DPDK.
128 A simplified example snippet is shown below, where the target binary name has been stored in the variable ``$(APP)``
129 and the sources for that build are stored in ``$(SRCS-y)``.
131 .. code-block:: makefile
135 CFLAGS += -O3 $(shell $(PKGCONF) --cflags libdpdk)
136 LDFLAGS += $(shell $(PKGCONF) --libs libdpdk)
138 $(APP): $(SRCS-y) Makefile
139 $(CC) $(CFLAGS) $(SRCS-y) -o $@ $(LDFLAGS)
143 Unlike with the older make build system, the meson system is not
144 designed to be used directly from a build directory. Instead it is
145 recommended that it be installed either system-wide or to a known
146 location in the user's home directory. The install location can be set
147 using the `--prefix` meson option (default: `/usr/local`).
149 an equivalent build recipe for a simple DPDK application using meson as a
150 build system is shown below:
152 .. code-block:: python
154 project('dpdk-app', 'c')
156 dpdk = dependency('libdpdk')
157 sources = files('main.c')
158 executable('dpdk-app', sources, dependencies: dpdk)
161 Installation of DPDK Target Environment using Make
162 --------------------------------------------------
166 The building of DPDK using make will be deprecated in a future release. It
167 is therefore recommended that DPDK installation is done using meson and
168 ninja as described above.
170 Get a native target environment automatically::
172 make defconfig O=mybuild
176 Within the configuration files, the ``RTE_MACHINE`` configuration value is set to native,
177 which means that the compiled software is tuned for the platform on which it is built.
179 Or get a specific target environment::
181 make config T=x86_64-native-linux-gcc O=mybuild
183 The format of a DPDK target is "ARCH-MACHINE-EXECENV-TOOLCHAIN".
184 Available targets can be found with::
188 Customize the target configuration in the generated ``.config`` file.
189 Example for enabling the pcap PMD::
191 sed -ri 's,(PMD_PCAP=).*,\1y,' mybuild/.config
199 Any kernel modules to be used, e.g. ``igb_uio``, ``kni``, must be compiled with the
200 same kernel as the one running on the target.
201 If the DPDK is not being built on the target machine,
202 the ``RTE_KERNELDIR`` environment variable should be used to point the compilation at a copy of the kernel version to be used on the target machine.
204 Install the target in a separate directory::
206 make install O=mybuild DESTDIR=myinstall prefix=
208 The environment is ready to build a DPDK application::
210 RTE_SDK=$(pwd)/myinstall/share/dpdk RTE_TARGET=x86_64-native-linux-gcc make -C myapp
212 In addition, the make clean command can be used to remove any existing compiled files for a subsequent full, clean rebuild of the code.
214 Browsing the Installed DPDK Environment Target
215 ----------------------------------------------
217 Once a target is created it contains all libraries, including poll-mode drivers, and header files for the DPDK environment that are required to build customer applications.
218 In addition, the test applications are built under the app directory, which may be used for testing.
219 A kmod directory is also present that contains kernel modules which may be loaded if needed.