212 lines
8.0 KiB
Plaintext
212 lines
8.0 KiB
Plaintext
INSTALLING DPDK USING THE MESON BUILD SYSTEM
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---------------------------------------------
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NOTE: Compiling and installing DPDK using ``meson`` and ``ninja``, rather
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than using ``make`` (GNU make) is EXPERIMENTAL. Official builds of DPDK
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should always be done using ``make``, as described in the ``Getting Started
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Guide`` documentation, and at "http://core.dpdk.org/doc/quick-start".
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Summary
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--------
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For many platforms, compiling and installing DPDK should work using the
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following set of commands::
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meson build
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cd build
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ninja
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ninja install
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This will compile DPDK in the ``build`` subdirectory, and then install the
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resulting libraries, drivers and header files onto the system - generally
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in /usr/local. A package-config file, ``libdpdk.pc``, for DPDK will also
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be installed to allow ease of compiling and linking with applications.
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After installation, to use DPDK, the necessary CFLAG and LDFLAG variables
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can be got from pkg-config::
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pkg-config --cflags libdpdk
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pkg-config --libs libdpdk
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More detail on each of these steps can be got from the following sections.
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Getting the Tools
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------------------
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The ``meson`` tool is used to configure a DPDK build. On most Linux
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distributions this can be got using the local package management system,
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e.g. ``dnf install meson`` or ``apt-get install meson``. If meson is not
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available as a suitable package, it can also be installed using the Python
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3 ``pip`` tool, e.g. ``pip3 install meson``. Version 0.42 of meson is
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recommended - if the version packaged is too old, the latest version is
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generally available from "pip".
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The other dependency for building is the ``ninja`` tool, which acts similar
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to make and performs the actual build using information provided by meson.
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Installing meson will, in many cases, also install ninja, but, if not
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already installed, it too is generally packaged by most Linux distributions.
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If not available as a package, it can be downloaded as source or binary from
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https://ninja-build.org/
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Configuring the Build
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----------------------
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To configure a build, run the meson tool, passing the path to the directory
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to be used for the build e.g. ``meson build``, as shown above. If calling
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meson from somewhere other than the root directory of the DPDK project the
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path to the root directory should be passed as the first parameter, and the
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build path as the second. For example, to build DPDK in /tmp/dpdk-build::
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user@host:/tmp$ meson ~user/dpdk dpdk-build
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Meson will then configure the build based on settings in the project's
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meson.build files, and by checking the build environment for e.g. compiler
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properties or the presence of dependencies, such as libpcap, or openssl
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libcrypto libraries. Once done, meson writes a ``build.ninja`` file in the
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build directory to be used to do the build itself when ninja is called.
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Tuning of the build is possible, both as part of the original meson call,
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or subsequently using ``meson configure`` command (``mesonconf`` in some
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older versions). Some options, such as ``buildtype``, or ``werror`` are
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built into meson, while others, such as ``max_lcores``, or the list of
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examples to build, are DPDK-specific. To have a list of all options
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available run ``meson configure`` in the build directory.
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Examples of adjusting the defaults when doing initial meson configuration.
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Project-specific options are passed used -Doption=value::
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meson --werror werrorbuild # build with warnings as errors
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meson --buildtype=debug debugbuild # build for debugging
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meson -Dexamples=l3fwd,l2fwd fwdbuild # build some examples as
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# part of the normal DPDK build
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meson -Dmax_lcores=8 smallbuild # scale build for smaller systems
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meson -Denable_docs=true fullbuild # build and install docs
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Examples of setting the same options using meson configure::
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meson configure -Dwerror=true
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meson configure -Dbuildtype=debug
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meson configure -Dexamples=l3fwd,l2fwd
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meson configure -Dmax_lcores=8
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NOTE: once meson has been run to configure a build in a directory, it
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cannot be run again on the same directory. Instead ``meson configure``
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should be used to change the build settings within the directory, and when
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``ninja`` is called to do the build itself, it will trigger the necessary
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re-scan from meson.
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As well as those settings taken from ``meson configure``, other options
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such as the compiler to use can be passed via environment variables. For
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example::
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CC=clang meson clang-build
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NOTE: for more comprehensive overriding of compilers or other environment
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settings, the tools for cross-compilation may be considered. However, for
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basic overriding of the compiler etc., the above form works as expected.
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Performing the Build
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---------------------
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Use ``ninja`` to perform the actual build inside the build folder
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previously configured. In most cases no arguments are necessary.
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Ninja accepts a number of flags which are similar to make. For example, to
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call ninja from outside the build folder, you can use ``ninja -C build``.
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Ninja also runs parallel builds by default, but you can limit this using
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the ``-j`` flag, e.g. ``ninja -j1 -v`` to do the build one step at a time,
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printing each command on a new line as it runs.
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Installing the Compiled Files
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------------------------------
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Use ``ninja install`` to install the required DPDK files onto the system.
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The install prefix defaults to ``/usr/local`` but can be used as with other
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options above. The environment variable ``DESTDIR`` can be used to adjust
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the root directory for the install, for example when packaging.
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With the base install directory, the individual directories for libraries
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and headers are configurable. By default, the following will be the
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installed layout::
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headers -> /usr/local/include
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libraries -> /usr/local/lib64
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drivers -> /usr/local/lib64/dpdk/drivers
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libdpdk.pc -> /usr/local/lib64/pkgconfig
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For the drivers, these will also be symbolically linked into the library
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install directory, so that ld.so can find them in cases where one driver may
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depend on another, e.g. a NIC PMD depending upon the PCI bus driver. Within
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the EAL, the default search path for drivers will be set to the configured
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driver install path, so dynamically-linked applications can be run without
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having to pass in ``-d /path/to/driver`` options for standard drivers.
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Cross Compiling DPDK
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--------------------
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To cross-compile DPDK on a desired target machine we can use the following
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command::
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meson cross-build --cross-file <target_machine_configuration>
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For example if the target machine is arm64 we can use the following
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command::
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meson arm-build --cross-file config/arm/arm64_armv8_linuxapp_gcc
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where config/arm/arm64_armv8_linuxapp_gcc contains the following
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parameters::
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[binaries]
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c = 'aarch64-linux-gnu-gcc'
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cpp = 'aarch64-linux-gnu-cpp'
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ar = 'aarch64-linux-gnu-ar'
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[host_machine]
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system = 'linux'
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cpu_family = 'aarch64'
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cpu = 'armv8-a'
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endian = 'little'
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Using the DPDK within an Application
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-------------------------------------
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To compile and link against DPDK within an application, pkg-config should
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be used to query the correct parameters. Examples of this are given in the
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makefiles for the example applications included with DPDK. They demonstrate
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how to link either against the DPDK shared libraries, or against the static
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versions of the same.
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From examples/helloworld/Makefile::
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PC_FILE := $(shell pkg-config --path libdpdk)
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CFLAGS += -O3 $(shell pkg-config --cflags libdpdk)
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LDFLAGS_SHARED = $(shell pkg-config --libs libdpdk)
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LDFLAGS_STATIC = -Wl,-Bstatic $(shell pkg-config --static --libs libdpdk)
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build/$(APP)-shared: $(SRCS-y) Makefile $(PC_FILE) | build
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$(CC) $(CFLAGS) $(SRCS-y) -o $@ $(LDFLAGS) $(LDFLAGS_SHARED)
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build/$(APP)-static: $(SRCS-y) Makefile $(PC_FILE) | build
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$(CC) $(CFLAGS) $(SRCS-y) -o $@ $(LDFLAGS) $(LDFLAGS_STATIC)
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build:
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@mkdir -p $@
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NOTE: for --static builds, DPDK needs to be built with Meson >= 0.46 in order to
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fully generate the list of private dependencies. If DPDK is built with an older
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version of Meson, it might be necessary to manually specify dependencies of DPDK
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PMDs/libraries, for example -lmlx5 -lmnl for librte-pmd-mlx5, or the static link
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step might fail.
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