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12 notice, this list of conditions and the following disclaimer in
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15 * Neither the name of Intel Corporation nor the names of its
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29 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 .. _compiling_sample_apps:
33 Compiling and Running Sample Applications
34 =========================================
36 The chapter describes how to compile and run applications in a DPDK
37 environment. It also provides a pointer to where sample applications are stored.
39 Compiling a Sample Application
40 ------------------------------
42 Once a DPDK target environment directory has been created (such as
43 ``x86_64-native-bsdapp-clang``), it contains all libraries and header files required
44 to build an application.
46 When compiling an application in the FreeBSD environment on the DPDK,
47 the following variables must be exported:
49 * ``RTE_SDK`` - Points to the DPDK installation directory.
51 * ``RTE_TARGET`` - Points to the DPDK target environment directory.
52 For FreeBSD, this is the ``x86_64-native-bsdapp-clang`` or
53 ``x86_64-native-bsdapp-gcc`` directory.
55 The following is an example of creating the ``helloworld`` application, which runs
56 in the DPDK FreeBSD environment. While the example demonstrates compiling
57 using gcc version 4.9, compiling with clang will be similar, except that the ``CC=``
58 parameter can probably be omitted. The ``helloworld`` example may be found in the
59 ``${RTE_SDK}/examples`` directory.
61 The directory contains the ``main.c`` file. This file, when combined with the
62 libraries in the DPDK target environment, calls the various functions to
63 initialize the DPDK environment, then launches an entry point (dispatch
64 application) for each core to be utilized. By default, the binary is generated
65 in the build directory.
67 .. code-block:: console
69 setenv RTE_SDK /home/user/DPDK
71 cd examples/helloworld/
72 setenv RTE_SDK $HOME/DPDK
73 setenv RTE_TARGET x86_64-native-bsdapp-gcc
78 INSTALL-APP helloworld
79 INSTALL-MAP helloworld.map
82 helloworld helloworld.map
86 In the above example, ``helloworld`` was in the directory structure of the
87 DPDK. However, it could have been located outside the directory
88 structure to keep the DPDK structure intact. In the following case,
89 the ``helloworld`` application is copied to a new directory as a new starting
92 .. code-block:: console
94 setenv RTE_SDK /home/user/DPDK
95 cp -r $(RTE_SDK)/examples/helloworld my_rte_app
97 setenv RTE_TARGET x86_64-native-bsdapp-gcc
102 INSTALL-APP helloworld
103 INSTALL-MAP helloworld.map
105 .. _running_sample_app:
107 Running a Sample Application
108 ----------------------------
110 #. The ``contigmem`` and ``nic_uio`` modules must be set up prior to running an application.
112 #. Any ports to be used by the application must be already bound to the ``nic_uio`` module,
113 as described in section :ref:`binding_network_ports`, prior to running the application.
114 The application is linked with the DPDK target environment's Environment
115 Abstraction Layer (EAL) library, which provides some options that are generic
116 to every DPDK application.
118 The following is the list of options that can be given to the EAL:
120 .. code-block:: console
122 ./rte-app -l CORELIST [-n NUM] [-b <domain:bus:devid.func>] \
123 [-r NUM] [-v] [--proc-type <primary|secondary|auto>]
127 EAL has a common interface between all operating systems and is based on the
128 Linux notation for PCI devices. For example, a FreeBSD device selector of
129 ``pci0:2:0:1`` is referred to as ``02:00.1`` in EAL.
131 The EAL options for FreeBSD are as follows:
133 * ``-c COREMASK`` or ``-l CORELIST``:
134 A hexadecimal bit mask of the cores to run on. Note that core numbering
135 can change between platforms and should be determined beforehand. The corelist
136 is a list of cores to use instead of a core mask.
139 Number of memory channels per processor socket.
141 * ``-b <domain:bus:devid.func>``:
142 Blacklisting of ports; prevent EAL from using specified PCI device
143 (multiple ``-b`` options are allowed).
146 Use the specified Ethernet device(s) only. Use comma-separate
147 ``[domain:]bus:devid.func`` values. Cannot be used with ``-b`` option.
150 Number of memory ranks.
153 Display version information on startup.
156 The type of process instance.
158 Other options, specific to Linux and are not supported under FreeBSD are as follows:
161 Memory to allocate from hugepages on specific sockets.
164 The directory where hugetlbfs is mounted.
167 The prefix text used for hugepage filenames.
170 Memory to allocate from hugepages, regardless of processor socket.
171 It is recommended that ``--socket-mem`` be used instead of this option.
173 The ``-c`` or ``-l`` option is mandatory; the others are optional.
175 Copy the DPDK application binary to your target, then run the application
176 as follows (assuming the platform has four memory channels, and that cores 0-3
177 are present and are to be used for running the application)::
179 ./helloworld -l 0-3 -n 4
183 The ``--proc-type`` and ``--file-prefix`` EAL options are used for running multiple
184 DPDK processes. See the "Multi-process Sample Application" chapter
185 in the *DPDK Sample Applications User Guide and the DPDK
186 Programmers Guide* for more details.
188 .. _running_non_root:
190 Running DPDK Applications Without Root Privileges
191 -------------------------------------------------
193 Although applications using the DPDK use network ports and other hardware
194 resources directly, with a number of small permission adjustments, it is possible
195 to run these applications as a user other than "root". To do so, the ownership,
196 or permissions, on the following file system objects should be adjusted to ensure
197 that the user account being used to run the DPDK application has access
200 * The userspace-io device files in ``/dev``, for example, ``/dev/uio0``, ``/dev/uio1``, and so on
202 * The userspace contiguous memory device: ``/dev/contigmem``
206 Please refer to the DPDK Release Notes for supported applications.