[PATCH v5 8/9] doc: update doc for packet capture framework

[Reshma Pattan <reshma.pattan@intel.com>]

Added programmers guide for librte_pdump.
Added sample application guide for app/pdump application.
Updated release note for packet capture framework changes.

Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
---
 MAINTAINERS                             |   3 +
 doc/guides/prog_guide/index.rst         |   1 +
 doc/guides/prog_guide/pdump_library.rst | 107 ++++++++++++++++++++++++++++
 doc/guides/rel_notes/release_16_07.rst  |  13 ++++
 doc/guides/sample_app_ug/index.rst      |   1 +
 doc/guides/sample_app_ug/pdump.rst      | 122 ++++++++++++++++++++++++++++++++
 6 files changed, 247 insertions(+)
 create mode 100644 doc/guides/prog_guide/pdump_library.rst
 create mode 100644 doc/guides/sample_app_ug/pdump.rst

diff --git a/MAINTAINERS b/MAINTAINERS
index a48c8de..ce7c941 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -436,6 +436,9 @@ Pdump
 M: Reshma Pattan <reshma.pattan@intel.com>
 F: lib/librte_pdump/
 F: app/pdump/
+F: doc/guides/prog_guide/pdump_library.rst
+F: doc/guides/sample_app_ug/pdump.rst
+
 
 Hierarchical scheduler
 M: Cristian Dumitrescu <cristian.dumitrescu@intel.com>
diff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst
index b862d0c..4caf969 100644
--- a/doc/guides/prog_guide/index.rst
+++ b/doc/guides/prog_guide/index.rst
@@ -71,6 +71,7 @@ Programmer's Guide
     writing_efficient_code
     profile_app
     glossary
+    pdump_library
 
 
 **Figures**
diff --git a/doc/guides/prog_guide/pdump_library.rst b/doc/guides/prog_guide/pdump_library.rst
new file mode 100644
index 0000000..1809234
--- /dev/null
+++ b/doc/guides/prog_guide/pdump_library.rst
@@ -0,0 +1,107 @@
+..  BSD LICENSE
+    Copyright(c) 2016 Intel Corporation. All rights reserved.
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+
+    * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+    * Neither the name of Intel Corporation nor the names of its
+    contributors may be used to endorse or promote products derived
+    from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+.. _pdump_library:
+
+The librte_pdump Library
+========================
+
+The ``librte_pdump`` library provides a framework for packet capturing in DPDK.
+The library provides the following APIs to initialize the packet capture framework, to enable
+or disable the packet capture, and to uninitialize it:
+
+* ``rte_pdump_init()``:
+  This API initializes the packet capture framework.
+
+* ``rte_pdump_enable()``:
+  This API enables the packet capture on a given port and queue.
+  Note: The filter option in the API is a place holder for future enhancements.
+
+* ``rte_pdump_enable_by_deviceid()``:
+  This API enables the packet capture on a given device id (``vdev name or pci address``) and queue.
+  Note: The filter option in the API is a place holder for future enhancements.
+
+* ``rte_pdump_disable()``:
+  This API disables the packet capture on a given port and queue.
+
+* ``rte_pdump_disable_by_deviceid()``:
+  This API disables the packet capture on a given device id (``vdev name or pci address``) and queue.
+
+* ``rte_pdump_uninit()``:
+  This API uninitializes the packet capture framework.
+
+
+Operation
+---------
+
+The ``librte_pdump`` library works on a client/server model. The server is responsible for enabling or
+disabling the packet capture and the clients are responsible for requesting the enabling or disabling of
+the packet capture.
+
+The packet capture framework, as part of its initialization, creates the pthread and the server socket in
+the pthread. The application that calls the framework initialization first will have the server socket created.
+Further calls to the framework initialization by the same application or other applications is not allowed i.e., only
+one server socket is allowed on the system. So the other applications can only request enabling or disabling of
+the packet capture at which point the client socket is created for them to send the request to the server.
+The server socket will listen for client requests for enabling or disabling the packet capture.
+
+
+Implementation Details
+----------------------
+
+The library API ``rte_pdump_init()``, initializes the packet capture framework by creating the pthread and the server
+socket. The server socket in the pthread context will be listening to the client requests to enable or disable the
+packet capture. Whoever calls this API first will have the server socket created, the subsequent calls to this APIs
+will not create any further server socket. i.e. only one server socket is allowed.
+
+The library APIs ``rte_pdump_enable()`` and ``rte_pdump_enable_by_deviceid()`` enables the packet capture.
+On each call to these APIs, the library creates a separate client socket, creates the "pdump enable" request and sends
+the request to the server. The server that is listening on the socket will take the request and enable the packet capture
+by registering the Ethernet RX and TX callbacks for the given port or device_id and queue combinations.
+Then the server will mirror the packets to the new mempool and enqueue them to the rte_ring that clients have passed
+to these APIs. The server also sends the response back to the client about the status of the request that was processed.
+After the response is received from the server, the client socket is closed.
+
+The library APIs ``rte_pdump_disable()`` and ``rte_pdump_disable_by_deviceid()`` disables the packet capture.
+On each call to these APIs, the library creates a separate client socket, creates the "pdump disable" request and sends
+the request to the server. The server that is listening on the socket will take the request and disable the packet
+capture by removing the Ethernet RX and TX callbacks for the given port or device_id and queue combinations. The server
+also sends the response back to the client about the status of the request that was processed. After the response is
+received from the server, the client socket is closed.
+
+The library API ``rte_pdump_uninit()``, uninitializes the packet capture framework by closing the pthread and the
+server socket.
+
+
+Use Case: Packet Capturing
+--------------------------
+
+The DPDK ``app/pdump`` tool is developed based on this library to capture packets in DPDK.
+Users can use this as an example to develop their own packet capturing application.
diff --git a/doc/guides/rel_notes/release_16_07.rst b/doc/guides/rel_notes/release_16_07.rst
index 307e7c4..438b705 100644
--- a/doc/guides/rel_notes/release_16_07.rst
+++ b/doc/guides/rel_notes/release_16_07.rst
@@ -57,6 +57,11 @@ New Features
   Enabled support for the AES CTR algorithm for Intel QuickAssist devices.
   Provided support for algorithm-chaining operations.
 
+* **Added packet capture framework.**
+
+  * A new library ``librte_pdump`` is added to provide packet capture APIs.
+  * A new ``app/pdump`` tool is added to capture packets in DPDK.
+
 
 Resolved Issues
 ---------------
@@ -126,6 +131,11 @@ API Changes
   ibadcrc, ibadlen, imcasts, fdirmatch, fdirmiss,
   tx_pause_xon, rx_pause_xon, tx_pause_xoff, rx_pause_xoff.
 
+* Function ``rte_eth_dev_get_port_by_name`` changed to a public API.
+
+* Function ``rte_eth_dev_info_get`` updated to return new fields ``nb_rx_queues`` and ``nb_tx_queues``
+  in the ``rte_eth_dev_info`` object.
+
 
 ABI Changes
 -----------
@@ -137,6 +147,9 @@ ABI Changes
 * The ``rte_port_source_params`` structure has new fields to support PCAP file.
   It was already in release 16.04 with ``RTE_NEXT_ABI`` flag.
 
+* The ``rte_eth_dev_info`` structure has new fields ``nb_rx_queues`` and ``nb_tx_queues``
+  to support number of queues configured by software.
+
 
 Shared Library Versions
 -----------------------
diff --git a/doc/guides/sample_app_ug/index.rst b/doc/guides/sample_app_ug/index.rst
index 930f68c..96bb317 100644
--- a/doc/guides/sample_app_ug/index.rst
+++ b/doc/guides/sample_app_ug/index.rst
@@ -76,6 +76,7 @@ Sample Applications User Guide
     ptpclient
     performance_thread
     ipsec_secgw
+    pdump
 
 **Figures**
 
diff --git a/doc/guides/sample_app_ug/pdump.rst b/doc/guides/sample_app_ug/pdump.rst
new file mode 100644
index 0000000..96c8709
--- /dev/null
+++ b/doc/guides/sample_app_ug/pdump.rst
@@ -0,0 +1,122 @@
+
+..  BSD LICENSE
+    Copyright(c) 2016 Intel Corporation. All rights reserved.
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+
+    * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+    * Neither the name of Intel Corporation nor the names of its
+    contributors may be used to endorse or promote products derived
+    from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+dpdk_pdump Application
+======================
+
+The ``dpdk_pdump`` application is a Data Plane Development Kit (DPDK) application that runs as a DPDK secondary process and
+is capable of enabling packet capture on dpdk ports.
+
+
+Running the Application
+-----------------------
+
+The application has a ``--pdump`` command line option with various sub arguments:
+
+.. code-block:: console
+
+   ./build/app/dpdk_pdump --
+                          --pdump '(port=<port id> | device_id=<pci id or vdev name>),
+                                   (queue=<queue_id>),
+                                   (rx-dev=<iface or pcap file> |
+                                    tx-dev=<iface or pcap file>),
+                                   [ring-size=<ring size>],
+                                   [mbuf-size=<mbuf data size>],
+                                   [total-num-mbufs=<number of mbufs>]'
+
+Note:
+
+* Parameters inside the parentheses represents mandatory parameters.
+
+* Parameters inside the square brackets represents optional parameters.
+
+Multiple instances of ``--pdump`` can be passed to capture packets on different port and queue combinations.
+
+
+Parameters
+~~~~~~~~~~
+
+``port``:
+Port id of the eth device on which packets should be captured.
+
+``device_id``:
+PCI address (or) name of the eth device on which packets should be captured.
+
+   .. Note::
+
+      * As of now the ``dpdk_pdump`` tool cannot capture the packets of virtual devices
+        in the primary process due to a bug in the ethdev library. Due to this bug, in a multi process context,
+        when the primary and secondary have different ports set, then the secondary process
+        (here the ``dpdk_pdump`` tool) overwrites the ``rte_eth_devices[]`` entries of the primary process.
+
+``queue``:
+Queue id of the eth device on which packets should be captured. The user can pass a queue value of ``*`` to enable
+packet capture on all queues of the eth device.
+
+``rx-dev``:
+Can be either a pcap file name or any Linux iface.
+
+``tx-dev``:
+Can be either a pcap file name or any Linux iface.
+
+   .. Note::
+
+      * To receive ingress packets only, ``rx-dev`` should be passed.
+
+      * To receive egress packets only, ``tx-dev`` should be passed.
+
+      * To receive ingress and egress packets separately ``rx-dev`` and ``tx-dev``
+        should both be passed with the different file names or the Linux iface names.
+
+      * To receive ingress and egress packets separately ``rx-dev`` and ``tx-dev``
+        should both be passed with the same file names or the the Linux iface names.
+
+``ring-size``:
+Size of the ring. This value is used internally for ring creation. The ring will be used to enqueue the packets from
+the primary application to the secondary. This is an optional parameter with default size 16384.
+
+``mbuf-size``:
+Size of the mbuf data. This is used internally for mempool creation. Ideally this value must be same as
+the primary application's mempool's mbuf data size which is used for packet RX. This is an optional parameter with
+default size 2176.
+
+``total-num-mbufs``:
+Total number mbufs in mempool. This is used internally for mempool creation. This is an optional parameter with default
+value 65535.
+
+
+Example
+-------
+
+.. code-block:: console
+
+   $ sudo ./build/app/dpdk_pdump -- --pdump 'port=0,queue=*,rx-dev=/tmp/rx.pcap'
-- 
2.5.0