xref: /dpdk/doc/guides/prog_guide/source_org.rst (revision fc1f2750a3ec6da919e3c86e59d56f34ec97154b)

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**Part 2: Development Environment**

Source Organization
===================

This section describes the organization of sources in the Intel® DPDK framework.

Makefiles and Config
--------------------

.. note::

    In the following descriptions,
    RTE_SDK is the environment variable that points to the base directory into which the tarball was extracted.
    See
    :ref:`Useful Variables Provided by the Build System <Useful_Variables_Provided_by_the_Build_System>`
    for descriptions of other variables.

Makefiles that are provided by the Intel® DPDK libraries and applications are located in $(RTE_SDK)/mk.

Config templates are located in $(RTE_SDK)/config. The templates describe the options that are enabled for each target.
The config file also contains items that can be enabled and disabled for many of the Intel® DPDK libraries,
including debug options.
The user should look at the config file and become familiar with the options.
The config file is also used to create a header file, which will be located in the new build directory.

Libraries
---------

Libraries are located in subdirectories of $(RTE_SDK)/lib.
By convention, we call a library any code that provides an API to an application.
Typically, it generates an archive file (.a), but a kernel module should also go in the same directory.

The lib directory contains::

    lib
    +-- librte_cmdline      # command line interface helper
    +-- librte_distributor  # packet distributor
    +-- librte_eal          # environment abstraction layer
    +-- librte_ether        # generic interface to poll mode driver
    +-- librte_hash         # hash library
    +-- librte_ip_frag      # IP fragmentation library
    +-- librte_ivshmem      # QEMU IVSHMEM library
    +-- librte_kni          # kernel NIC interface
    +-- librte_kvargs       # argument parsing library
    +-- librte_lpm          # longest prefix match library
    +-- librte_malloc       # malloc-like functions
    +-- librte_mbuf         # packet and control mbuf manipulation library
    +-- librte_mempool      # memory pool manager (fixedsized objects)
    +-- librte_meter        # QoS metering library
    +-- librte_net          # various IP-related headers
    +-- librte_pmd_bond     # bonding poll mode driver
    +-- librte_pmd_e1000    # 1GbE poll mode drivers (igb and em)
    +-- librte_pmd_ixgbe    # 10GbE poll mode driver
    +-- librte_pmd_i40e     # 40GbE poll mode driver
    +-- librte_pmd_pcap     # PCAP poll mode driver
    +-- librte_pmd_ring     # ring poll mode driver
    +-- librte_pmd_virtio   # virtio poll mode driver
    +-- librte_pmd_vmxnet3  # VMXNET3 poll mode driver
    +-- librte_pmd_xenvirt  # Xen virtio poll mode driver
    +-- librte_power        # power management library
    +-- librte_ring         # software rings (act as lockless FIFOs)
    +-- librte_sched        # QoS scheduler and dropper library
    +-- librte_timer        # timer library

Applications
------------

Applications are sources that contain a main() function.
They are located in the $(RTE_SDK)/app and $(RTE_SDK)/examples directories.

The app directory contains sample applications that are used to test the Intel® DPDK (autotests).
The examples directory contains sample applications that show how libraries can be used.

::

    app
    +-- chkincs            # test prog to check include depends
    +-- test               # autotests, to validate DPDK features
    `-- test-pmd           # test and bench poll mode driver examples

    examples
    +-- cmdline            # Example of using cmdline library
    +-- dpdk_qat           # Example showing integration with Intel QuickAssist
    +-- exception_path     # Sending packets to and from Linux ethernet device (TAP)
    +-- helloworld         # Helloworld basic example
    +-- ip_reassembly      # Example showing IP Reassembly
    +-- ip_fragmentation   # Example showing IPv4 Fragmentation
    +-- ipv4_multicast     # Example showing IPv4 Multicast
    +-- kni                # Kernel NIC Interface example
    +-- l2fwd              # L2 Forwarding example with and without SR-IOV
    +-- l3fwd              # L3 Forwarding example
    +-- l3fwd-power        # L3 Forwarding example with power management
    +-- l3fwd-vf           # L3 Forwarding example with SR-IOV
    +-- link_status_interrupt # Link status change interrupt example
    +-- load_balancer      # Load balancing across multiple cores/sockets
    +-- multi_process      # Example applications with multiple DPDK processes
    +-- qos_meter          # QoS metering example
    +-- qos_sched          # QoS scheduler and dropper example
    +-- timer              # Example of using librte_timer library
    +-- vmdq_dcb           # Intel 82599 Ethernet Controller VMDQ and DCB receiving
    +-- vmdq               # Example of VMDQ receiving for both Intel 10G (82599) and 1G (82576, 82580 and I350) Ethernet Controllers
    `-- vhost              # Example of userspace vhost and switch

.. note::

    The actual examples directory may contain additional sample applications to those shown above.
    Check the latest Intel® DPDK source files for details.