2 Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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15 * Neither the name of Intel Corporation nor the names of its
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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 4.8, 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 ${RTE_SDK}/examples directory.
61 The directory contains the main.c file. This file, when combined with the
62 libraries in the DPDK target environment, calls the various functions to
63 initialize the DPDK environment, then launches an entry point (dispatch
64 application) for each core to be utilized. By default, the binary is generated
65 in the build directory.
67 .. code-block:: console
69 user@host:~/DPDK$ cd examples/helloworld/
70 user@host:~/DPDK/examples/helloworld$ setenv RTE_SDK $HOME/DPDK
71 user@host:~/DPDK/examples/helloworld$ setenv RTE_TARGET x86_64-native-bsdapp-gcc
72 user@host:~/DPDK/examples/helloworld$ gmake CC=gcc48
75 INSTALL-APP helloworld
76 INSTALL-MAP helloworld.map
77 user@host:~/DPDK/examples/helloworld$ ls build/app
78 helloworld helloworld.map
82 In the above example, helloworld was in the directory structure of the
83 DPDK. However, it could have been located outside the directory
84 structure to keep the DPDK structure intact. In the following case,
85 the helloworld application is copied to a new directory as a new starting
88 .. code-block:: console
90 user@host:~$ setenv RTE_SDK /home/user/DPDK
91 user@host:~$ cp -r $(RTE_SDK)/examples/helloworld my_rte_app
92 user@host:~$ cd my_rte_app/
93 user@host:~$ setenv RTE_TARGET x86_64-native-bsdapp-gcc
94 user@host:~/my_rte_app$ gmake CC=gcc48
97 INSTALL-APP helloworld
98 INSTALL-MAP helloworld.map
100 .. _running_sample_app:
102 Running a Sample Application
103 ----------------------------
105 #. The contigmem and nic_uio modules must be set up prior to running an application.
107 #. Any ports to be used by the application must be already bound to the nic_uio module,
108 as described in section :ref:`binding_network_ports`, prior to running the application.
109 The application is linked with the DPDK target environment's Environment
110 Abstraction Layer (EAL) library, which provides some options that are generic
111 to every DPDK application.
113 The following is the list of options that can be given to the EAL:
115 .. code-block:: console
117 ./rte-app -n NUM [-c COREMASK] [-b <domain:bus:devid.func>] [-r NUM] [-v] [--proc-type <primary|secondary|auto>]
121 EAL has a common interface between all operating systems and is based on the
122 Linux* notation for PCI devices. For example, a FreeBSD* device selector of
123 pci0:2:0:1 is referred to as 02:00.1 in EAL.
125 The EAL options for FreeBSD* are as follows:
128 : A hexadecimal bit mask of the cores to run on. Note that core numbering
129 can change between platforms and should be determined beforehand.
132 : Number of memory channels per processor socket.
134 * -b <domain:bus:devid.func>
135 : blacklisting of ports; prevent EAL from using specified PCI device
136 (multiple -b options are allowed).
139 : use the specified Ethernet device(s) only. Use comma-separate
140 <[domain:]bus:devid.func> values. Cannot be used with -b option.
143 : Number of memory ranks.
146 : Display version information on startup.
149 : The type of process instance.
151 Other options, specific to Linux* and are not supported under FreeBSD* are as follows:
154 : Memory to allocate from hugepages on specific sockets.
157 : The directory where hugetlbfs is mounted.
160 : The prefix text used for hugepage filenames.
163 : Memory to allocate from hugepages, regardless of processor socket.
164 It is recommended that --socket-mem be used instead of this option.
166 The -c and the -n options are mandatory; the others are optional.
168 Copy the DPDK application binary to your target, then run the application
169 as follows (assuming the platform has four memory channels, and that cores 0-3
170 are present and are to be used for running the application):
172 .. code-block:: console
174 root@target:~$ ./helloworld -c f -n 4
178 The --proc-type and --file-prefix EAL options are used for running multiple
179 DPDK processes. See the “Multi-process Sample Application” chapter
180 in the *DPDK Sample Applications User Guide and the DPDK
181 Programmers Guide* for more details.
183 .. _running_non_root:
185 Running DPDK Applications Without Root Privileges
186 -------------------------------------------------
188 Although applications using the DPDK use network ports and other hardware
189 resources directly, with a number of small permission adjustments, it is possible
190 to run these applications as a user other than “root”. To do so, the ownership,
191 or permissions, on the following file system objects should be adjusted to ensure
192 that the user account being used to run the DPDK application has access
195 * The userspace-io device files in /dev, for example, /dev/uio0, /dev/uio1, and so on
197 * The userspace contiguous memory device: /dev/contigmem
201 Please refer to the DPDK Release Notes for supported applications.