From: Pablo de Lara Date: Wed, 5 Jul 2017 05:26:20 +0000 (+0100) Subject: doc: add new crypto session information X-Git-Tag: spdx-start~2646 X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=bb59dac7b37dfd250a297a264a21cf4bea2516ab;p=dpdk.git doc: add new crypto session information Modified cryptodev library section in Programmer's Guide, with the recent changes in the crypto sessions. Signed-off-by: Slawomir Mrozowicz Signed-off-by: Pablo de Lara Acked-by: Declan Doherty Acked-by: Akhil Goyal Acked-by: John McNamara --- diff --git a/doc/guides/prog_guide/cryptodev_lib.rst b/doc/guides/prog_guide/cryptodev_lib.rst index 8feaeced27..bfef7cc6ac 100644 --- a/doc/guides/prog_guide/cryptodev_lib.rst +++ b/doc/guides/prog_guide/cryptodev_lib.rst @@ -114,9 +114,8 @@ The rte_cryptodev_configure API is used to configure a Crypto device. int rte_cryptodev_configure(uint8_t dev_id, struct rte_cryptodev_config *config) -The ``rte_cryptodev_config`` structure is used to pass the configuration parameters. -In contains parameter for socket selection, number of queue pairs and the -session mempool configuration. +The ``rte_cryptodev_config`` structure is used to pass the configuration +parameters for socket selection and number of queue pairs. .. code-block:: c @@ -125,12 +124,6 @@ session mempool configuration. /**< Socket to allocate resources on */ uint16_t nb_queue_pairs; /**< Number of queue pairs to configure on device */ - - struct { - uint32_t nb_objs; - uint32_t cache_size; - } session_mp; - /**< Session mempool configuration */ }; @@ -432,7 +425,7 @@ operations, as well as also supporting AEAD operations. Session and Session Management -Session are used in symmetric cryptographic processing to store the immutable +Sessions are used in symmetric cryptographic processing to store the immutable data defined in a cryptographic transform which is used in the operation processing of a packet flow. Sessions are used to manage information such as expand cipher keys and HMAC IPADs and OPADs, which need to be calculated for a @@ -443,27 +436,33 @@ Crypto workloads. .. figure:: img/cryptodev_sym_sess.* -The Crypto device framework provides a set of session pool management APIs for -the creation and freeing of the sessions, utilizing the Mempool Library. - -The framework also provides hooks so the PMDs can pass the amount of memory -required for that PMDs private session parameters, as well as initialization -functions for the configuration of the session parameters and freeing function -so the PMD can managed the memory on destruction of a session. - -**Note**: Sessions created on a particular device can only be used on Crypto -devices of the same type - the same driver id used by this devices, -and if you try to use a session on a device different -to that on which it was created then the Crypto operation will fail. - -``rte_cryptodev_sym_session_create()`` is used to create a symmetric session on -Crypto device. A symmetric transform chain is used to specify the particular -operation and its parameters. See the section below for details on transforms. - -.. code-block:: c - - struct rte_cryptodev_sym_session * rte_cryptodev_sym_session_create( - uint8_t dev_id, struct rte_crypto_sym_xform *xform); +The Crypto device framework provides APIs to allocate and initizalize sessions +for crypto devices, where sessions are mempool objects. +It is the application's responsibility to create and manage the session mempools. +This approach allows for different scenarios such as having a single session +mempool for all crypto devices (where the mempool object size is big +enough to hold the private session of any crypto device), as well as having +multiple session mempools of different sizes for better memory usage. + +An application can use ``rte_cryptodev_get_private_session_size()`` to +get the private session size of given crypto device. This function would allow +an application to calculate the max device session size of all crypto devices +to create a single session mempool. +If instead an application creates multiple session mempools, the Crypto device +framework also provides ``rte_cryptodev_get_header_session_size`` to get +the size of an uninitialized session. + +Once the session mempools have been created, ``rte_cryptodev_sym_session_create()`` +is used to allocate an uninitialized session from the given mempool. +The session then must be initialized using ``rte_cryptodev_sym_session_init()`` +for each of the required crypto devices. A symmetric transform chain +is used to specify the operation and its parameters. See the section below for +details on transforms. + +When a session is no longer used, user must call ``rte_cryptodev_sym_session_clear()`` +for each of the crypto devices that are using the session, to free all driver +private session data. Once this is done, session should be freed using +``rte_cryptodev_sym_session_free`` which returns them to their mempool. Transforms and Transform Chaining diff --git a/doc/guides/prog_guide/img/cryptodev_sym_sess.svg b/doc/guides/prog_guide/img/cryptodev_sym_sess.svg index e5f41ec5f5..a807cebac4 100644 --- a/doc/guides/prog_guide/img/cryptodev_sym_sess.svg +++ b/doc/guides/prog_guide/img/cryptodev_sym_sess.svg @@ -1,10 +1,50 @@ - - -