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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 has current only been tested on Fedora 21 64-bit with gcc.

Features
--------

AESNI GCM PMD has support for:

Cipher algorithms:

* RTE_CRYPTO_CIPHER_AES_GCM

Authentication algorithms:

* RTE_CRYPTO_AUTH_AES_GCM

Initialization
--------------

In order to enable this virtual crypto PMD, user must:

* Export the environmental variable AESNI_MULTI_BUFFER_LIB_PATH with the path where
  the library was extracted.

* Build the multi buffer library (go to Installation section in AES-NI MB PMD documentation).

* Set CONFIG_RTE_LIBRTE_PMD_AESNI_GCM=y in config/common_base.

To use the PMD in an application, user must:

* Call rte_eal_vdev_init("cryptodev_aesni_gcm_pmd") within the application.

* Use --vdev="cryptodev_aesni_gcm_pmd" in the EAL options, which will call rte_eal_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 -c 40 -n 4 --vdev="cryptodev_aesni_gcm_pmd,socket_id=1,max_nb_sessions=128"

Limitations
-----------

* Chained mbufs are not supported.
* Hash only is not supported.
* Cipher only is not supported.
* Only in-place is currently supported (destination address is the same as source address).
* Only supports session-oriented API implementation (session-less APIs are not supported).
*  Not performance tuned.