[PATCH v5 4/4] doc: add usage doc for ENETC PMD

[Gagandeep Singh <g.singh@nxp.com>]

Add enetc usage document to compile and run the
DPDK application on enetc supported platform.
This document introduces the enetc driver, supported
platforms and supported features.

Signed-off-by: Gagandeep Singh <g.singh@nxp.com>
---
 MAINTAINERS                            |   1 +
 doc/guides/nics/enetc.rst              | 110 +++++++++++++++++++++++++
 doc/guides/nics/features/enetc.ini     |   1 +
 doc/guides/nics/index.rst              |   1 +
 doc/guides/rel_notes/release_18_11.rst |   5 ++
 5 files changed, 118 insertions(+)
 create mode 100644 doc/guides/nics/enetc.rst

diff --git a/MAINTAINERS b/MAINTAINERS
index 0443addc0..b67f2afa4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -647,6 +647,7 @@ NXP enetc
 M: Gagandeep Singh <g.singh@nxp.com>
 M: Pankaj Chauhan <pankaj.chauhan@nxp.com>
 F: drivers/net/enetc/
+F: doc/guides/nics/enetc.rst
 F: doc/guides/nics/features/enetc.ini
 
 QLogic bnx2x
diff --git a/doc/guides/nics/enetc.rst b/doc/guides/nics/enetc.rst
new file mode 100644
index 000000000..8038bf205
--- /dev/null
+++ b/doc/guides/nics/enetc.rst
@@ -0,0 +1,110 @@
+.. SPDX-License-Identifier: BSD-3-Clause
+   Copyright 2018 NXP
+
+ENETC Poll Mode Driver
+======================
+
+The ENETC NIC PMD (**librte_pmd_enetc**) provides poll mode driver
+support for the inbuilt NIC found in the **NXP LS1028** SoC.
+
+More information can be found at `NXP Official Website
+<https://www.nxp.com/products/processors-and-microcontrollers/arm-based-processors-and-mcus/qoriq-layerscape-arm-processors/qoriq-layerscape-1028a-industrial-applications-processor:LS1028A>`_.
+
+ENETC
+-----
+
+This section provides an overview of the NXP ENETC
+and how it is integrated into the DPDK.
+
+Contents summary
+
+- ENETC overview
+- ENETC features
+- PCI bus driver
+- NIC driver
+- Supported ENETC SoCs
+- Prerequisites
+- Driver compilation and testing
+
+ENETC Overview
+~~~~~~~~~~~~~~
+
+ENETC is a PCI Integrated End Point(IEP). IEP implements
+peripheral devices in an SoC such that software sees them as PCIe device.
+ENETC is an evolution of BDR(Buffer Descriptor Ring) based networking
+IPs.
+
+This infrastructure simplifies adding support for IEP and facilitates in following:
+
+- Device discovery and location
+- Resource requirement discovery and allocation (e.g. interrupt assignment,
+  device register address)
+- Event reporting
+
+ENETC Features
+~~~~~~~~~~~~~~
+
+- Link Status
+- Packet type information
+
+NIC Driver (PMD)
+~~~~~~~~~~~~~~~~
+
+ENETC PMD is traditional DPDK PMD which provides necessary interface between
+RTE framework and ENETC internal drivers.
+
+- Driver registers the device vendor table in PCI subsystem.
+- RTE framework scans the PCI bus for connected devices.
+- This scanning will invoke the probe function of ENETC driver.
+- The probe function will set the basic device registers and also setups BD rings.
+- On packet Rx the respective BD Ring status bit is set which is then used for
+  packet processing.
+- Then Tx is done first followed by Rx.
+
+Supported ENETC SoCs
+~~~~~~~~~~~~~~~~~~~~
+
+- LS1028
+
+Prerequisites
+~~~~~~~~~~~~~
+
+There are three main pre-requisities for executing ENETC PMD on a ENETC
+compatible board:
+
+1. **ARM 64 Tool Chain**
+
+   For example, the `*aarch64* Linaro Toolchain <https://releases.linaro.org/components/toolchain/binaries/7.3-2018.05/aarch64-linux-gnu/gcc-linaro-7.3.1-2018.05-i686_aarch64-linux-gnu.tar.xz>`_.
+
+2. **Linux Kernel**
+
+   It can be obtained from `NXP's Github hosting <https://source.codeaurora.org/external/qoriq/qoriq-components/linux>`_.
+
+3. **Rootfile system**
+
+   Any *aarch64* supporting filesystem can be used. For example,
+   Ubuntu 16.04 LTS (Xenial) or 18.04 (Bionic) userland which can be obtained
+   from `here <http://cdimage.ubuntu.com/ubuntu-base/releases/18.04/release/ubuntu-base-18.04.1-base-arm64.tar.gz>`_.
+
+The following dependencies are not part of DPDK and must be installed
+separately:
+
+- **NXP Linux LSDK**
+
+  NXP Layerscape software development kit (LSDK) includes support for family
+  of QorIQ® ARM-Architecture-based system on chip (SoC) processors
+  and corresponding boards.
+
+  It includes the Linux board support packages (BSPs) for NXP SoCs,
+  a fully operational tool chain, kernel and board specific modules.
+
+  LSDK and related information can be obtained from:  `LSDK <https://www.nxp.com/support/developer-resources/run-time-software/linux-software-and-development-tools/layerscape-software-development-kit:LAYERSCAPE-SDK>`_
+
+Driver compilation and testing
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Follow instructions available in the document
+:ref:`compiling and testing a PMD for a NIC <pmd_build_and_test>`
+to launch **testpmd**
+
+To compile in performance mode, please set ``CONFIG_RTE_CACHE_LINE_SIZE=64``
diff --git a/doc/guides/nics/features/enetc.ini b/doc/guides/nics/features/enetc.ini
index bd9cb0bc0..69476a2a1 100644
--- a/doc/guides/nics/features/enetc.ini
+++ b/doc/guides/nics/features/enetc.ini
@@ -8,3 +8,4 @@ Packet type parsing  = Y
 Link status          = Y
 Linux VFIO           = Y
 ARMv8                = Y
+Usage doc            = Y
diff --git a/doc/guides/nics/index.rst b/doc/guides/nics/index.rst
index 59f6063dc..0323035d3 100644
--- a/doc/guides/nics/index.rst
+++ b/doc/guides/nics/index.rst
@@ -21,6 +21,7 @@ Network Interface Controller Drivers
     dpaa2
     e1000em
     ena
+    enetc
     enic
     fm10k
     i40e
diff --git a/doc/guides/rel_notes/release_18_11.rst b/doc/guides/rel_notes/release_18_11.rst
index 3ae6b3f58..1fa7152d2 100644
--- a/doc/guides/rel_notes/release_18_11.rst
+++ b/doc/guides/rel_notes/release_18_11.rst
@@ -50,6 +50,11 @@ New Features
      * Other libs
      * Apps, Examples, Tools (if significative)
 
+   * **Added NXP ENETC PMD.**
+
+     Added the new enetc driver for NXP enetc platform. See the
+     "ENETC Poll Mode Driver" document for more details on this new driver.
+
      This section is a comment. Do not overwrite or remove it.
      Also, make sure to start the actual text at the margin.
      =========================================================
-- 
2.17.1