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.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2016-2020 Intel Corporation.
AES-NI GCM Crypto Poll Mode Driver
==================================
The AES-NI GCM PMD (**librte_pmd_aesni_gcm**) provides poll mode crypto driver
support for utilizing Intel multi buffer library (see AES-NI Multi-buffer PMD documentation
to learn more about it, including installation).
The AES-NI GCM PMD supports synchronous mode of operation with
``rte_cryptodev_sym_cpu_crypto_process`` function call for both AES-GCM and
GMAC, however GMAC support is limited to one segment per operation. Please
refer to ``rte_crypto`` programmer's guide for more detail.
Features
--------
AESNI GCM PMD has support for:
Authentication algorithms:
* RTE_CRYPTO_AUTH_AES_GMAC
AEAD algorithms:
* RTE_CRYPTO_AEAD_AES_GCM
Limitations
-----------
* In out-of-place operations, chained destination mbufs are not supported.
* Chained mbufs are only supported by RTE_CRYPTO_AEAD_AES_GCM algorithm,
not RTE_CRYPTO_AUTH_AES_GMAC.
* Cipher only is not supported.
Installation
------------
To build DPDK with the AESNI_GCM_PMD the user is required to download the multi-buffer
library from `here <https://github.com/01org/intel-ipsec-mb>`_
and compile it on their user system before building DPDK.
The latest version of the library supported by this PMD is v0.54, which
can be downloaded in `<https://github.com/01org/intel-ipsec-mb/archive/v0.54.zip>`_.
.. code-block:: console
make
make install
The library requires NASM to be built. Depending on the library version, it might
require a minimum NASM version (e.g. v0.54 requires at least NASM 2.14).
NASM is packaged for different OS. However, on some OS the version is too old,
so a manual installation is required. In that case, NASM can be downloaded from
`NASM website <https://www.nasm.us/pub/nasm/releasebuilds/?C=M;O=D>`_.
Once it is downloaded, extract it and follow these steps:
.. code-block:: console
./configure
make
make install
.. note::
Compilation of the Multi-Buffer library is broken when GCC < 5.0, if library <= v0.53.
If a lower GCC version than 5.0, the workaround proposed by the following link
should be used: `<https://github.com/intel/intel-ipsec-mb/issues/40>`_.
As a reference, the following table shows a mapping between the past DPDK versions
and the external crypto libraries supported by them:
.. _table_aesni_gcm_versions:
.. table:: DPDK and external crypto library version compatibility
============= ================================
DPDK version Crypto library version
============= ================================
16.04 - 16.11 Multi-buffer library 0.43 - 0.44
17.02 - 17.05 ISA-L Crypto v2.18
17.08 - 18.02 Multi-buffer library 0.46 - 0.48
18.05 - 19.02 Multi-buffer library 0.49 - 0.52
19.05+ Multi-buffer library 0.52 - 0.54
============= ================================
Initialization
--------------
In order to enable this virtual crypto PMD, user must:
* Build the multi buffer library (explained in Installation section).
* Set CONFIG_RTE_LIBRTE_PMD_AESNI_GCM=y in config/common_base.
To use the PMD in an application, user must:
* Call rte_vdev_init("crypto_aesni_gcm") within the application.
* Use --vdev="crypto_aesni_gcm" in the EAL options, which will call rte_vdev_init() internally.
The following parameters (all optional) can be provided in the previous two calls:
* socket_id: Specify the socket where the memory for the device is going to be allocated
(by default, socket_id will be the socket where the core that is creating the PMD is running on).
* max_nb_queue_pairs: Specify the maximum number of queue pairs in the device (8 by default).
* max_nb_sessions: Specify the maximum number of sessions that can be created (2048 by default).
Example:
.. code-block:: console
./l2fwd-crypto -l 1 -n 4 --vdev="crypto_aesni_gcm,socket_id=0,max_nb_sessions=128" \
-- -p 1 --cdev SW --chain AEAD --aead_algo "aes-gcm"
|
