.. SPDX-License-Identifier: BSD-3-Clause
   Copyright(c) 2018 Cavium, Inc

Cavium OCTEON TX Crypto Poll Mode Driver
========================================

The OCTEON TX crypto poll mode driver provides support for offloading
cryptographic operations to cryptographic accelerator units on
**OCTEON TX** :sup:`®` family of processors (CN8XXX). The OCTEON TX crypto
poll mode driver enqueues the crypto request to this accelerator and dequeues
the response once the operation is completed.

Supported Algorithms
--------------------

Cipher Algorithms
~~~~~~~~~~~~~~~~~

* ``RTE_CRYPTO_CIPHER_NULL``
* ``RTE_CRYPTO_CIPHER_3DES_CBC``
* ``RTE_CRYPTO_CIPHER_3DES_ECB``
* ``RTE_CRYPTO_CIPHER_AES_CBC``
* ``RTE_CRYPTO_CIPHER_AES_CTR``
* ``RTE_CRYPTO_CIPHER_AES_XTS``
* ``RTE_CRYPTO_CIPHER_DES_CBC``
* ``RTE_CRYPTO_CIPHER_KASUMI_F8``
* ``RTE_CRYPTO_CIPHER_SNOW3G_UEA2``
* ``RTE_CRYPTO_CIPHER_ZUC_EEA3``

Hash Algorithms
~~~~~~~~~~~~~~~

* ``RTE_CRYPTO_AUTH_NULL``
* ``RTE_CRYPTO_AUTH_AES_GMAC``
* ``RTE_CRYPTO_AUTH_KASUMI_F9``
* ``RTE_CRYPTO_AUTH_MD5``
* ``RTE_CRYPTO_AUTH_MD5_HMAC``
* ``RTE_CRYPTO_AUTH_SHA1``
* ``RTE_CRYPTO_AUTH_SHA1_HMAC``
* ``RTE_CRYPTO_AUTH_SHA224``
* ``RTE_CRYPTO_AUTH_SHA224_HMAC``
* ``RTE_CRYPTO_AUTH_SHA256``
* ``RTE_CRYPTO_AUTH_SHA256_HMAC``
* ``RTE_CRYPTO_AUTH_SHA384``
* ``RTE_CRYPTO_AUTH_SHA384_HMAC``
* ``RTE_CRYPTO_AUTH_SHA512``
* ``RTE_CRYPTO_AUTH_SHA512_HMAC``
* ``RTE_CRYPTO_AUTH_SNOW3G_UIA2``
* ``RTE_CRYPTO_AUTH_ZUC_EIA3``

AEAD Algorithms
~~~~~~~~~~~~~~~

* ``RTE_CRYPTO_AEAD_AES_GCM``

Config flags
------------

For compiling the OCTEON TX crypto poll mode driver, please check if the
CONFIG_RTE_LIBRTE_PMD_OCTEONTX_CRYPTO setting is set to `y` in
config/common_base file.

* ``CONFIG_RTE_LIBRTE_PMD_OCTEONTX_CRYPTO=y``

Compilation
-----------

The OCTEON TX crypto poll mode driver can be compiled either natively on
**OCTEON TX** :sup:`®` board or cross-compiled on an x86 based platform.

Refer :doc:`../platform/octeontx` for details about setting up the platform
and building DPDK applications.

.. note::

   OCTEON TX crypto PF driver needs microcode to be available at `/lib/firmware/` directory.
   Refer SDK documents for further information.

SDK and related information can be obtained from: `Cavium support site <https://support.cavium.com/>`_.

Execution
---------

The number of crypto VFs to be enabled can be controlled by setting sysfs entry,
`sriov_numvfs`, for the corresponding PF driver.

.. code-block:: console

        echo <num_vfs> > /sys/bus/pci/devices/<dev_bus_id>/sriov_numvfs

The device bus ID, `dev_bus_id`, to be used in the above step can be found out
by using dpdk-devbind.py script. The OCTEON TX crypto PF device need to be
identified and the corresponding device number can be used to tune various PF
properties.


Once the required VFs are enabled, dpdk-devbind.py script can be used to
identify the VFs. To be accessible from DPDK, VFs need to be bound to vfio-pci
driver:

.. code-block:: console

        cd <dpdk directory>
        ./usertools/dpdk-devbind.py -u <vf device no>
        ./usertools/dpdk-devbind.py -b vfio-pci <vf device no>

Appropriate huge page need to be setup in order to run the DPDK example
applications.

.. code-block:: console

        echo 8 > /sys/kernel/mm/hugepages/hugepages-524288kB/nr_hugepages
        mkdir /mnt/huge
        mount -t hugetlbfs nodev /mnt/huge

Example applications can now be executed with crypto operations offloaded to
OCTEON TX crypto PMD.

.. code-block:: console

        ./build/ipsec-secgw --log-level=8 -c 0xff -- -P -p 0x3 -u 0x2 --config
        "(1,0,0),(0,0,0)" -f ep1.cfg
