[PATCH v3 5/6] doc: add documentation for szedata2 PMD

[Matej Vido <matejvido@gmail.com>]

v3:
Edit formatting.
Add links.

Signed-off-by: Matej Vido <matejvido@gmail.com>
---
 doc/guides/nics/index.rst            |   1 +
 doc/guides/nics/szedata2.rst         | 127 +++++++++++++++++++++++++++++++++++
 doc/guides/prog_guide/source_org.rst |   1 +
 3 files changed, 129 insertions(+)
 create mode 100644 doc/guides/nics/szedata2.rst

diff --git a/doc/guides/nics/index.rst b/doc/guides/nics/index.rst
index 2d4936d..0a0b724 100644
--- a/doc/guides/nics/index.rst
+++ b/doc/guides/nics/index.rst
@@ -46,6 +46,7 @@ Network Interface Controller Drivers
     intel_vf
     mlx4
     mlx5
+    szedata2
     virtio
     vmxnet3
     pcap_ring
diff --git a/doc/guides/nics/szedata2.rst b/doc/guides/nics/szedata2.rst
new file mode 100644
index 0000000..b952b46
--- /dev/null
+++ b/doc/guides/nics/szedata2.rst
@@ -0,0 +1,127 @@
+..  BSD LICENSE
+    Copyright 2015 CESNET
+    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 CESNET 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.
+
+SZEDATA2 poll mode driver library
+=================================
+
+The SZEDATA2 poll mode driver library implements support for cards from COMBO
+family (**COMBO-80G**, **COMBO-100G**).
+The SZEDATA2 PMD is virtual PMD which uses interface provided by libsze2
+library to communicate with COMBO cards over sze2 layer.
+
+More information about family of
+`COMBO cards <https://www.liberouter.org/technologies/cards/>`_
+and used technology
+(`NetCOPE platform <https://www.liberouter.org/technologies/netcope/>`_) can be
+found on the `Liberouter website <https://www.liberouter.org/>`_.
+
+.. note::
+
+   This driver has external dependencies.
+   Therefore it is disabled in default configuration files.
+   It can be enabled by setting ``CONFIG_RTE_LIBRTE_PMD_SZEDATA2=y``
+   and recompiling.
+
+Prerequisities
+--------------
+
+This PMD requires kernel modules which are responsible for initialization and
+allocation of resources needed for sze2 layer function.
+Communication between PMD and kernel modules is mediated by libsze2 library.
+These kernel modules and library are not part of DPDK and must be installed
+separately:
+
+*  **libsze2 library**
+
+   The library provides API for initialization of sze2 transfers, receiving and
+   transmitting data segments.
+
+*  **Kernel modules**
+
+   * combov3
+   * szedata2_cv3
+
+   Kernel modules manage initialization of hardware, allocation and
+   sharing of resources for user space applications:
+
+Information about getting the dependencies can be found `here
+<https://www.liberouter.org/technologies/netcope/access-to-libsze2-library/>`_.
+
+
+Using the SZEDATA2 PMD
+----------------------
+
+SZEDATA2 PMD can be created by passing ``--vdev=`` option to EAL in the
+following format:
+
+.. code-block:: console
+
+   --vdev 'DEVICE,dev_path=PATH,rx_ifaces=RX_MASK,tx_ifaces=TX_MASK'
+
+``DEVICE`` and options ``dev_path``, ``rx_ifaces``, ``tx_ifaces`` are mandatory
+and must be separated by commas.
+
+*  ``DEVICE``: contains prefix ``eth_szedata2`` followed by numbers or letters,
+   must be unique for each virtual device
+
+*  ``dev_path``: Defines path to szedata2 device.
+   Value is valid path to szedata2 device. Example:
+
+   .. code-block:: console
+
+      dev_path=/dev/szedataII0
+
+*  ``rx_ifaces``: Defines which receive channels will be used.
+   For each channel is created one queue. Value is mask for selecting which
+   receive channels are required. Example:
+
+   .. code-block:: console
+
+      rx_ifaces=0x3
+
+*  ``tx_ifaces``: Defines which transmit channels will be used.
+   For each channel is created one queue. Value is mask for selecting which
+   transmit channels are required. Example:
+
+   .. code-block:: console
+
+      tx_ifaces=0x3
+
+Example of usage
+----------------
+
+Read packets from 0. and 1. receive channel and write them to 0. and 1.
+transmit channel:
+
+.. code-block:: console
+
+   $RTE_TARGET/app/testpmd -c 0xf -n 2 \
+   --vdev 'eth_szedata20,dev_path=/dev/szedataII0,rx_ifaces=0x3,tx_ifaces=0x3' \
+   -- --port-topology=chained --rxq=2 --txq=2 --nb-cores=2
diff --git a/doc/guides/prog_guide/source_org.rst b/doc/guides/prog_guide/source_org.rst
index ae11b3b..0c06d47 100644
--- a/doc/guides/prog_guide/source_org.rst
+++ b/doc/guides/prog_guide/source_org.rst
@@ -106,6 +106,7 @@ The drivers directory has a *net* subdirectory which contains::
     +-- null               # NULL poll mode driver for testing
     +-- pcap               # PCAP poll mode driver
     +-- ring               # Ring poll mode driver
+    +-- szedata2           # SZEDATA2 poll mode driver
     +-- virtio             # Virtio poll mode driver
     +-- vmxnet3            # VMXNET3 poll mode driver
     +-- xenvirt            # Xen virtio poll mode driver
-- 
1.9.1