[PATCH v5 4/7] doc: update documentation about ARMv8 crypto PMD

[<zbigniew.bodek@caviumnetworks.com>]

From: Zbigniew Bodek <zbigniew.bodek@caviumnetworks.com>

Add documentation about the driver and update
release notes.

Signed-off-by: Zbigniew Bodek <zbigniew.bodek@caviumnetworks.com>
Reviewed-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
---
 doc/guides/cryptodevs/armv8.rst        | 96 ++++++++++++++++++++++++++++++++++
 doc/guides/cryptodevs/index.rst        |  1 +
 doc/guides/rel_notes/release_17_02.rst |  5 ++
 3 files changed, 102 insertions(+)
 create mode 100644 doc/guides/cryptodevs/armv8.rst

diff --git a/doc/guides/cryptodevs/armv8.rst b/doc/guides/cryptodevs/armv8.rst
new file mode 100644
index 0000000..ca8781e
--- /dev/null
+++ b/doc/guides/cryptodevs/armv8.rst
@@ -0,0 +1,96 @@
+..  BSD LICENSE
+    Copyright (C) Cavium networks Ltd. 2017.
+
+    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 Cavium networks 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.
+
+
+ARMv8 Crypto Poll Mode Driver
+================================
+
+This code provides the initial implementation of the ARMv8 crypto PMD.
+The driver uses ARMv8 cryptographic extensions to process chained crypto
+operations in an optimized way. The core functionality is provided by
+a low-level library, written in the assembly code.
+
+Features
+--------
+
+ARMv8 Crypto PMD has support for the following algorithm pairs:
+
+Supported cipher algorithms:
+* ``RTE_CRYPTO_CIPHER_AES_CBC``
+
+Supported authentication algorithms:
+* ``RTE_CRYPTO_AUTH_SHA1_HMAC``
+* ``RTE_CRYPTO_AUTH_SHA256_HMAC``
+
+Installation
+------------
+
+In order to enable this virtual crypto PMD, user must:
+
+* Download ARMv8 crypto library source code from
+  `here <https://github.com/caviumnetworks/armv8_crypto>`_
+
+* Export the environmental variable ARMV8_CRYPTO_LIB_PATH with
+  the path where the ``armv8_crypto`` library was downloaded
+  or cloned.
+
+* Build the library by invoking:
+
+.. code-block:: console
+
+	make -C $ARMV8_CRYPTO_LIB_PATH/
+
+* Set CONFIG_RTE_LIBRTE_PMD_ARMV8_CRYPTO=y in
+  config/defconfig_arm64-armv8a-linuxapp-gcc
+
+The corresponding device can be created only if the following features
+are supported by the CPU:
+
+* ``RTE_CPUFLAG_AES``
+* ``RTE_CPUFLAG_SHA1``
+* ``RTE_CPUFLAG_SHA2``
+* ``RTE_CPUFLAG_NEON``
+
+Initialization
+--------------
+
+User can use app/test application to check how to use this PMD and to verify
+crypto processing.
+
+Test name is cryptodev_sw_armv8_autotest.
+For performance test cryptodev_sw_armv8_perftest can be used.
+
+Limitations
+-----------
+
+* Maximum number of sessions is 2048.
+* Only chained operations are supported.
+* AES-128-CBC is the only supported cipher variant.
+* Cipher input data has to be a multiple of 16 bytes.
+* Digest input data has to be a multiple of 8 bytes.
diff --git a/doc/guides/cryptodevs/index.rst b/doc/guides/cryptodevs/index.rst
index a6a9f23..06c3f6e 100644
--- a/doc/guides/cryptodevs/index.rst
+++ b/doc/guides/cryptodevs/index.rst
@@ -38,6 +38,7 @@ Crypto Device Drivers
     overview
     aesni_mb
     aesni_gcm
+    armv8
     kasumi
     openssl
     null
diff --git a/doc/guides/rel_notes/release_17_02.rst b/doc/guides/rel_notes/release_17_02.rst
index d59e386..e9c6c00 100644
--- a/doc/guides/rel_notes/release_17_02.rst
+++ b/doc/guides/rel_notes/release_17_02.rst
@@ -111,6 +111,11 @@ New Features
 
   * Support for single operations (cipher only and authentication only).
 
+* **Added armv8 crypto PMD.**
+
+  A new crypto PMD has been added, which provides combined mode cryptografic
+  operations optimized for ARMv8 processors. The driver can be used to enhance
+  performance in processing chained operations such as cipher + HMAC.
 
 Resolved Issues
 ---------------
-- 
1.9.1