doc: prefer https when pointing to dpdk.org

[dpdk.git] / doc / guides / prog_guide / cryptodev_lib.rst

diff --git a/doc/guides/prog_guide/cryptodev_lib.rst b/doc/guides/prog_guide/cryptodev_lib.rst
index bf0ee79..c14f750 100644 (file)
--- a/doc/guides/prog_guide/cryptodev_lib.rst
+++ b/doc/guides/prog_guide/cryptodev_lib.rst
@@ -1,5 +1,5 @@
 ..  SPDX-License-Identifier: BSD-3-Clause
-    Copyright(c) 2016-2017 Intel Corporation.
+    Copyright(c) 2016-2020 Intel Corporation.
 
 Cryptography Device Library
 ===========================
@@ -498,7 +498,7 @@ to specify the details of the Crypto operation. For chaining of symmetric
 operations such as cipher encrypt and authentication generate, the next pointer
 allows transform to be chained together. Crypto devices which support chaining
 must publish the chaining of symmetric Crypto operations feature flag. Allocation of the
-xform structure is in the the application domain. To allow future API extensions in a
+xform structure is in the application domain. To allow future API extensions in a
 backwardly compatible manner, e.g. addition of a new parameter, the application should
 zero the full xform struct before populating it.
 
@@ -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
 -----------
 
@@ -893,7 +924,7 @@ Asymmetric Crypto transforms (``rte_crypto_asym_xform``) are the mechanism used
 to specify the details of the asymmetric Crypto operation. Next pointer within
 xform allows transform to be chained together. Also it is important to note that
 the order in which the transforms are passed indicates the order of the chaining. Allocation
-of the xform structure is in the the application domain. To allow future API extensions in a
+of the xform structure is in the application domain. To allow future API extensions in a
 backwardly compatible manner, e.g. addition of a new parameter, the application should
 zero the full xform struct before populating it.
 
@@ -1097,4 +1128,4 @@ Asymmetric Crypto Device API
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The cryptodev Library API is described in the
-`DPDK API Reference <http://doc.dpdk.org/api/>`_
+`DPDK API Reference <https://doc.dpdk.org/api/>`_