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31 .. _linux_gsg_compiling_dpdk:
33 Compiling the DPDK Target from Source
34 =====================================
38 Parts of this process can also be done using the setup script described in
39 the :ref:`linux_setup_script` section of this document.
41 Install the DPDK and Browse Sources
42 -----------------------------------
44 First, uncompress the archive and move to the uncompressed DPDK source directory:
46 .. code-block:: console
48 unzip DPDK-<version>.zip
51 The DPDK is composed of several directories:
53 * lib: Source code of DPDK libraries
55 * drivers: Source code of DPDK poll-mode drivers
57 * app: Source code of DPDK applications (automatic tests)
59 * examples: Source code of DPDK application examples
61 * config, tools, scripts, mk: Framework-related makefiles, scripts and configuration
63 Installation of DPDK Target Environments
64 ----------------------------------------
66 The format of a DPDK target is::
68 ARCH-MACHINE-EXECENV-TOOLCHAIN
72 * ``ARCH`` can be: ``i686``, ``x86_64``, ``ppc_64``
74 * ``MACHINE`` can be: ``native``, ``power8``
76 * ``EXECENV`` can be: ``linuxapp``, ``bsdapp``
78 * ``TOOLCHAIN`` can be: ``gcc``, ``icc``
80 The targets to be installed depend on the 32-bit and/or 64-bit packages and compilers installed on the host.
81 Available targets can be found in the DPDK/config directory.
82 The defconfig\_ prefix should not be used.
86 Configuration files are provided with the ``RTE_MACHINE`` optimization level set.
87 Within the configuration files, the ``RTE_MACHINE`` configuration value is set to native,
88 which means that the compiled software is tuned for the platform on which it is built.
89 For more information on this setting, and its possible values, see the *DPDK Programmers Guide*.
91 When using the IntelĀ® C++ Compiler (icc), one of the following commands should be invoked for 64-bit or 32-bit use respectively.
92 Notice that the shell scripts update the ``$PATH`` variable and therefore should not be performed in the same session.
93 Also, verify the compiler's installation directory since the path may be different:
95 .. code-block:: console
97 source /opt/intel/bin/iccvars.sh intel64
98 source /opt/intel/bin/iccvars.sh ia32
100 To install and make targets, use the ``make install T=<target>`` command in the top-level DPDK directory.
102 For example, to compile a 64-bit target using icc, run:
104 .. code-block:: console
106 make install T=x86_64-native-linuxapp-icc
108 To compile a 32-bit build using gcc, the make command should be:
110 .. code-block:: console
112 make install T=i686-native-linuxapp-gcc
114 To prepare a target without building it, for example, if the configuration changes need to be made before compilation,
115 use the ``make config T=<target>`` command:
117 .. code-block:: console
119 make config T=x86_64-native-linuxapp-gcc
123 Any kernel modules to be used, e.g. ``igb_uio``, ``kni``, must be compiled with the
124 same kernel as the one running on the target.
125 If the DPDK is not being built on the target machine,
126 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.
128 Once the target environment is created, the user may move to the target environment directory and continue to make code changes and re-compile.
129 The user may also make modifications to the compile-time DPDK configuration by editing the .config file in the build directory.
130 (This is a build-local copy of the defconfig file from the top- level config directory).
132 .. code-block:: console
134 cd x86_64-native-linuxapp-gcc
138 In addition, the make clean command can be used to remove any existing compiled files for a subsequent full, clean rebuild of the code.
140 Browsing the Installed DPDK Environment Target
141 ----------------------------------------------
143 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.
144 In addition, the test and testpmd applications are built under the build/app directory, which may be used for testing.
145 A kmod directory is also present that contains kernel modules which may be loaded if needed.
147 Loading Modules to Enable Userspace IO for DPDK
148 -----------------------------------------------
150 To run any DPDK application, a suitable uio module can be loaded into the running kernel.
151 In many cases, the standard ``uio_pci_generic`` module included in the Linux kernel
152 can provide the uio capability. This module can be loaded using the command
154 .. code-block:: console
156 sudo modprobe uio_pci_generic
158 As an alternative to the ``uio_pci_generic``, the DPDK also includes the igb_uio
159 module which can be found in the kmod subdirectory referred to above. It can
160 be loaded as shown below:
162 .. code-block:: console
165 sudo insmod kmod/igb_uio.ko
169 For some devices which lack support for legacy interrupts, e.g. virtual function
170 (VF) devices, the ``igb_uio`` module may be needed in place of ``uio_pci_generic``.
172 Since DPDK release 1.7 onward provides VFIO support, use of UIO is optional
173 for platforms that support using VFIO.
178 To run an DPDK application and make use of VFIO, the ``vfio-pci`` module must be loaded:
180 .. code-block:: console
182 sudo modprobe vfio-pci
184 Note that in order to use VFIO, your kernel must support it.
185 VFIO kernel modules have been included in the Linux kernel since version 3.6.0 and are usually present by default,
186 however please consult your distributions documentation to make sure that is the case.
188 Also, to use VFIO, both kernel and BIOS must support and be configured to use IO virtualization (such as IntelĀ® VT-d).
190 For proper operation of VFIO when running DPDK applications as a non-privileged user, correct permissions should also be set up.
191 This can be done by using the DPDK setup script (called dpdk-setup.sh and located in the tools directory).
193 .. _linux_gsg_binding_kernel:
195 Binding and Unbinding Network Ports to/from the Kernel Modules
196 --------------------------------------------------------------
198 As of release 1.4, DPDK applications no longer automatically unbind all supported network ports from the kernel driver in use.
199 Instead, all ports that are to be used by an DPDK application must be bound to the
200 ``uio_pci_generic``, ``igb_uio`` or ``vfio-pci`` module before the application is run.
201 Any network ports under Linux* control will be ignored by the DPDK poll-mode drivers and cannot be used by the application.
205 The DPDK will, by default, no longer automatically unbind network ports from the kernel driver at startup.
206 Any ports to be used by an DPDK application must be unbound from Linux* control and
207 bound to the ``uio_pci_generic``, ``igb_uio`` or ``vfio-pci`` module before the application is run.
209 To bind ports to the ``uio_pci_generic``, ``igb_uio`` or ``vfio-pci`` module for DPDK use,
210 and then subsequently return ports to Linux* control,
211 a utility script called dpdk_nic _bind.py is provided in the tools subdirectory.
212 This utility can be used to provide a view of the current state of the network ports on the system,
213 and to bind and unbind those ports from the different kernel modules, including the uio and vfio modules.
214 The following are some examples of how the script can be used.
215 A full description of the script and its parameters can be obtained by calling the script with the ``--help`` or ``--usage`` options.
216 Note that the uio or vfio kernel modules to be used, should be loaded into the kernel before
217 running the ``dpdk-devbind.py`` script.
221 Due to the way VFIO works, there are certain limitations to which devices can be used with VFIO.
222 Mainly it comes down to how IOMMU groups work.
223 Any Virtual Function device can be used with VFIO on its own, but physical devices will require either all ports bound to VFIO,
224 or some of them bound to VFIO while others not being bound to anything at all.
226 If your device is behind a PCI-to-PCI bridge, the bridge will then be part of the IOMMU group in which your device is in.
227 Therefore, the bridge driver should also be unbound from the bridge PCI device for VFIO to work with devices behind the bridge.
231 While any user can run the dpdk-devbind.py script to view the status of the network ports,
232 binding or unbinding network ports requires root privileges.
234 To see the status of all network ports on the system:
236 .. code-block:: console
238 ./tools/dpdk-devbind.py --status
240 Network devices using DPDK-compatible driver
241 ============================================
242 0000:82:00.0 '82599EB 10-GbE NIC' drv=uio_pci_generic unused=ixgbe
243 0000:82:00.1 '82599EB 10-GbE NIC' drv=uio_pci_generic unused=ixgbe
245 Network devices using kernel driver
246 ===================================
247 0000:04:00.0 'I350 1-GbE NIC' if=em0 drv=igb unused=uio_pci_generic *Active*
248 0000:04:00.1 'I350 1-GbE NIC' if=eth1 drv=igb unused=uio_pci_generic
249 0000:04:00.2 'I350 1-GbE NIC' if=eth2 drv=igb unused=uio_pci_generic
250 0000:04:00.3 'I350 1-GbE NIC' if=eth3 drv=igb unused=uio_pci_generic
252 Other network devices
253 =====================
256 To bind device ``eth1``,``04:00.1``, to the ``uio_pci_generic`` driver:
258 .. code-block:: console
260 ./tools/dpdk-devbind.py --bind=uio_pci_generic 04:00.1
264 .. code-block:: console
266 ./tools/dpdk-devbind.py --bind=uio_pci_generic eth1
268 To restore device ``82:00.0`` to its original kernel binding:
270 .. code-block:: console
272 ./tools/dpdk-devbind.py --bind=ixgbe 82:00.0