Modified cryptodev library section in Programmer's Guide,
with the recent changes in the crypto sessions.
Signed-off-by: Slawomir Mrozowicz <slawomirx.mrozow...@intel.com>
Signed-off-by: Pablo de Lara <pablo.de.lara.gua...@intel.com>
---
doc/guides/prog_guide/cryptodev_lib.rst | 59 ++--
doc/guides/prog_guide/img/cryptodev_sym_sess.svg | 418 ++++++++++++++++++++---
2 files changed, 400 insertions(+), 77 deletions(-)
diff --git a/doc/guides/prog_guide/cryptodev_lib.rst
b/doc/guides/prog_guide/cryptodev_lib.rst
index 4644802..3d3239d 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 */
};
@@ -431,7 +424,7 @@ 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
@@ -442,27 +435,31 @@ 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.
+
+Unused session should be freed using ``rte_cryptodev_sym_session_free`` which
+returns them to their mempool.
**Note**: For AEAD operations the algorithm selected for authentication and
ciphering must aligned, eg AES_GCM.
diff --git a/doc/guides/prog_guide/img/cryptodev_sym_sess.svg
b/doc/guides/prog_guide/img/cryptodev_sym_sess.svg
index e5f41ec..a807ceb 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 @@
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