[dpdk-dev] [PATCH v4 8/8] doc: add cpu crypto related documentation

[Marcin Smoczynski <marcinx.smoczynski@intel.com>]

Update documentation with a description of cpu crypto in cryptodev,
ipsec and security libraries.

Add release notes for 20.02.

Signed-off-by: Marcin Smoczynski <marcinx.smoczynski@intel.com>
---
 doc/guides/cryptodevs/aesni_gcm.rst     |  5 ++++
 doc/guides/prog_guide/cryptodev_lib.rst | 31 +++++++++++++++++++++++++
 doc/guides/prog_guide/ipsec_lib.rst     |  8 +++++++
 doc/guides/prog_guide/rte_security.rst  | 15 ++++++++----
 doc/guides/rel_notes/release_20_02.rst  |  8 +++++++
 5 files changed, 63 insertions(+), 4 deletions(-)

diff --git a/doc/guides/cryptodevs/aesni_gcm.rst b/doc/guides/cryptodevs/aesni_gcm.rst
index 151aa3060..6b1a3d2a0 100644
--- a/doc/guides/cryptodevs/aesni_gcm.rst
+++ b/doc/guides/cryptodevs/aesni_gcm.rst
@@ -9,6 +9,11 @@ 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
 --------
 
diff --git a/doc/guides/prog_guide/cryptodev_lib.rst b/doc/guides/prog_guide/cryptodev_lib.rst
index ac1643774..1a01e1bda 100644
--- a/doc/guides/prog_guide/cryptodev_lib.rst
+++ b/doc/guides/prog_guide/cryptodev_lib.rst
@@ -600,6 +600,37 @@ chain.
         };
     };
 
+Synchronous mode
+----------------
+
+Some cryptodevs support synchronous mode alongside with a standard asynchronous
+mode. In that case operations are performed directly when calling
+``rte_cryptodev_sym_cpu_crypto_process`` method instead of enqueuing and
+dequeuing an operation before. This mode of operation allows cryptodevs which
+utilize CPU cryptographic acceleration to have significant performance boost
+comparing to standard asynchronous approach. Cryptodevs supporting synchronous
+mode have ``RTE_CRYPTODEV_FF_SYM_CPU_CRYPTO`` feature flag set.
+
+To perform a synchronous operation a call to
+``rte_cryptodev_sym_cpu_crypto_process`` has to be made with vectorized
+operation descriptor (``struct rte_crypto_sym_vec``) containing:
+
+- ``num`` - number of operations to perform,
+- pointer to an array of size ``num`` containing a scatter-gather list
+  descriptors of performed operations (``struct rte_crypto_sgl``). Each instance
+  of ``struct rte_crypto_sgl`` consists of a number of segments and a pointer to
+  an array of segment descriptors ``struct rte_crypto_vec``;
+- pointers to arrays of size ``num`` containing IV, AAD and digest information,
+- pointer to an array of size ``num`` where status information will be stored
+  for each operation.
+
+Function returns a number of successfully completed operations and sets
+appropriate status number for each operation in the status array provided as
+a call argument. Status different than zero must be treated as error.
+
+For more details, e.g. how to convert an mbuf to an SGL, please refer to an
+example usage in the IPsec library implementation.
+
 Sample code
 -----------
 
diff --git a/doc/guides/prog_guide/ipsec_lib.rst b/doc/guides/prog_guide/ipsec_lib.rst
index 1ce0db453..e6a21fae6 100644
--- a/doc/guides/prog_guide/ipsec_lib.rst
+++ b/doc/guides/prog_guide/ipsec_lib.rst
@@ -81,6 +81,14 @@ In that mode the library functions perform
   - verify that crypto device operations (encryption, ICV generation)
     were completed successfully
 
+RTE_SECURITY_ACTION_TYPE_CPU_CRYPTO
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In that mode the library functions perform same operations as in
+``RTE_SECURITY_ACTION_TYPE_NONE``. The only differnce is that crypto operations
+are performed with CPU crypto synchronous API.
+
+
 RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/doc/guides/prog_guide/rte_security.rst b/doc/guides/prog_guide/rte_security.rst
index f77fb89dc..a911c676b 100644
--- a/doc/guides/prog_guide/rte_security.rst
+++ b/doc/guides/prog_guide/rte_security.rst
@@ -511,13 +511,20 @@ Offload.
         /**< No security actions */
         RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO,
         /**< Crypto processing for security protocol is processed inline
-         * during transmission */
+         * during transmission
+         */
         RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL,
         /**< All security protocol processing is performed inline during
-         * transmission */
-        RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL
+         * transmission
+         */
+        RTE_SECURITY_ACTION_TYPE_LOOKASIDE_PROTOCOL,
         /**< All security protocol processing including crypto is performed
-         * on a lookaside accelerator */
+         * on a lookaside accelerator
+         */
+        RTE_SECURITY_ACTION_TYPE_CPU_CRYPTO
+        /**< Crypto processing for security protocol is processed by CPU
+         * synchronously
+         */
     };
 
 The ``rte_security_session_protocol`` is defined as
diff --git a/doc/guides/rel_notes/release_20_02.rst b/doc/guides/rel_notes/release_20_02.rst
index 50e2c1484..b6cf0c4d1 100644
--- a/doc/guides/rel_notes/release_20_02.rst
+++ b/doc/guides/rel_notes/release_20_02.rst
@@ -143,6 +143,14 @@ New Features
   Added a new OCTEON TX2 rawdev PMD for End Point mode of operation.
   See the :doc:`../rawdevs/octeontx2_ep` for more details on this new PMD.
 
+* **Added synchronous Crypto burst API.**
+
+  A new API is introduced in crypto library to handle synchronous cryptographic
+  operations allowing to achieve performance gain for cryptodevs which use
+  CPU based acceleration, such as Intel AES-NI. An example implementation
+  for aesni_gcm cryptodev is provided including unit tests. The IPsec example
+  application and ipsec library itself were changed to allow utilization of this
+  new feature.
 
 Removed Items
 -------------
-- 
2.17.1