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32 dpdk-pdump Application
33 ======================
35 The ``dpdk-pdump`` tool is a Data Plane Development Kit (DPDK) tool that runs as
36 a DPDK secondary process and is capable of enabling packet capture on dpdk ports.
39 * The ``dpdk-pdump`` tool can only be used in conjunction with a primary
40 application which has the packet capture framework initialized already.
41 In dpdk, only the ``testpmd`` is modified to initialize packet capture
42 framework, other applications remain untouched. So, if the ``dpdk-pdump``
43 tool has to be used with any application other than the testpmd, user
44 needs to explicitly modify that application to call packet capture
45 framework initialization code. Refer ``app/test-pmd/testpmd.c``
46 code to see how this is done.
48 * The ``dpdk-pdump`` tool depends on libpcap based PMD which is disabled
49 by default in the build configuration files,
50 owing to an external dependency on the libpcap development files
51 which must be installed on the board.
52 Once the libpcap development files are installed, the libpcap based PMD
53 can be enabled by setting CONFIG_RTE_LIBRTE_PMD_PCAP=y and recompiling the DPDK.
56 Running the Application
57 -----------------------
59 The tool has a number of command line options:
61 .. code-block:: console
63 ./build/app/dpdk-pdump --
64 --pdump '(port=<port id> | device_id=<pci id or vdev name>),
66 (rx-dev=<iface or pcap file> |
67 tx-dev=<iface or pcap file>),
68 [ring-size=<ring size>],
69 [mbuf-size=<mbuf data size>],
70 [total-num-mbufs=<number of mbufs>]'
71 [--server-socket-path=<server socket dir>]
72 [--client-socket-path=<client socket dir>]
74 The ``--pdump`` command line option is mandatory and it takes various sub arguments which are described in
79 * Parameters inside the parentheses represents mandatory parameters.
81 * Parameters inside the square brackets represents optional parameters.
83 * Multiple instances of ``--pdump`` can be passed to capture packets on different port and queue combinations.
85 The ``--server-socket-path`` command line option is optional. This represents the server socket directory.
86 If no value is passed default values are used i.e. ``/var/run/.dpdk/`` for root users and ``~/.dpdk/``
89 The ``--client-socket-path`` command line option is optional. This represents the client socket directory.
90 If no value is passed default values are used i.e. ``/var/run/.dpdk/`` for root users and ``~/.dpdk/``
94 The ``--pdump`` parameters
95 ~~~~~~~~~~~~~~~~~~~~~~~~~~
98 Port id of the eth device on which packets should be captured.
101 PCI address (or) name of the eth device on which packets should be captured.
105 * As of now the ``dpdk-pdump`` tool cannot capture the packets of virtual devices
106 in the primary process due to a bug in the ethdev library. Due to this bug, in a multi process context,
107 when the primary and secondary have different ports set, then the secondary process
108 (here the ``dpdk-pdump`` tool) overwrites the ``rte_eth_devices[]`` entries of the primary process.
111 Queue id of the eth device on which packets should be captured. The user can pass a queue value of ``*`` to enable
112 packet capture on all queues of the eth device.
115 Can be either a pcap file name or any Linux iface.
118 Can be either a pcap file name or any Linux iface.
122 * To receive ingress packets only, ``rx-dev`` should be passed.
124 * To receive egress packets only, ``tx-dev`` should be passed.
126 * To receive ingress and egress packets separately ``rx-dev`` and ``tx-dev``
127 should both be passed with the different file names or the Linux iface names.
129 * To receive ingress and egress packets together, ``rx-dev`` and ``tx-dev``
130 should both be passed with the same file name or the same Linux iface name.
133 Size of the ring. This value is used internally for ring creation. The ring will be used to enqueue the packets from
134 the primary application to the secondary. This is an optional parameter with default size 16384.
137 Size of the mbuf data. This is used internally for mempool creation. Ideally this value must be same as
138 the primary application's mempool's mbuf data size which is used for packet RX. This is an optional parameter with
142 Total number mbufs in mempool. This is used internally for mempool creation. This is an optional parameter with default
149 .. code-block:: console
151 $ sudo ./build/app/dpdk-pdump -- --pdump 'port=0,queue=*,rx-dev=/tmp/rx.pcap'