[dpdk-dev] [PATCH v4] cryptodev: extend api of asymmetric crypto by sessionless

[Arek Kusztal <arkadiuszx.kusztal@intel.com>]

This commit adds asymmetric session-less option to
rte_crypto_asym_op. Feature flag for sessionless is added
to rte_cryptodev.

Signed-off-by: Arek Kusztal <arkadiuszx.kusztal@intel.com>
---
v2:
- added union
v3:
- added entry into feature matrix
- added information to prog_guide
v4:
- fixed formatting
- fixed grammar

 doc/guides/cryptodevs/features/default.ini | 1 +
 doc/guides/prog_guide/cryptodev_lib.rst    | 9 ++++++++-
 lib/librte_cryptodev/rte_crypto_asym.h     | 9 +++++++--
 lib/librte_cryptodev/rte_cryptodev.h       | 2 ++
 4 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/doc/guides/cryptodevs/features/default.ini b/doc/guides/cryptodevs/features/default.ini
index d3ee1af..b7f9a0a 100644
--- a/doc/guides/cryptodevs/features/default.ini
+++ b/doc/guides/cryptodevs/features/default.ini
@@ -26,6 +26,7 @@ OOP LB  In LB  Out     =
 RSA PRIV OP KEY EXP    =
 RSA PRIV OP KEY QT     =
 Digest encrypted       =
+Asymmetric sessionless =
 
 ;
 ; Supported crypto algorithms of a default crypto driver.
diff --git a/doc/guides/prog_guide/cryptodev_lib.rst b/doc/guides/prog_guide/cryptodev_lib.rst
index 9719944..4584834 100644
--- a/doc/guides/prog_guide/cryptodev_lib.rst
+++ b/doc/guides/prog_guide/cryptodev_lib.rst
@@ -876,7 +876,14 @@ private asymmetric session data. Once this is done, session should be freed usin
 
 Asymmetric Sessionless Support
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-Currently asymmetric crypto framework does not support sessionless.
+Asymmetric crypto framework supports sessionless operations.
+
+Fields that should be set by user are:
+
+Member xform of struct rte_crypto_asym_op should point to the user created rte_crypto_asym_xform.
+Note that this rte_crypto_asym_xform should be immutable for the lifetime of associated crypto_op.
+
+Member sess_type of rte_crypto_op should be set to RTE_CRYPTO_OP_SESSIONLESS.
 
 Transforms and Transform Chaining
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/lib/librte_cryptodev/rte_crypto_asym.h b/lib/librte_cryptodev/rte_crypto_asym.h
index 4fbef2f..0d34ce8 100644
--- a/lib/librte_cryptodev/rte_crypto_asym.h
+++ b/lib/librte_cryptodev/rte_crypto_asym.h
@@ -522,8 +522,13 @@ struct rte_crypto_dsa_op_param {
  *
  */
 struct rte_crypto_asym_op {
-	struct rte_cryptodev_asym_session *session;
-	/**< Handle for the initialised session context */
+	RTE_STD_C11
+	union {
+		struct rte_cryptodev_asym_session *session;
+		/**< Handle for the initialised session context */
+		struct rte_crypto_asym_xform *xform;
+		/**< Session-less API crypto operation parameters */
+	};
 
 	__extension__
 	union {
diff --git a/lib/librte_cryptodev/rte_cryptodev.h b/lib/librte_cryptodev/rte_cryptodev.h
index e175b83..c6ffa3b 100644
--- a/lib/librte_cryptodev/rte_cryptodev.h
+++ b/lib/librte_cryptodev/rte_cryptodev.h
@@ -448,6 +448,8 @@ rte_cryptodev_asym_get_xform_enum(enum rte_crypto_asym_xform_type *xform_enum,
 /**< Support RSA Private Key OP with CRT (quintuple) Keys */
 #define RTE_CRYPTODEV_FF_DIGEST_ENCRYPTED		(1ULL << 19)
 /**< Support encrypted-digest operations where digest is appended to data */
+#define RTE_CRYPTODEV_FF_ASYM_SESSIONLESS		(1ULL << 20)
+/**< Support asymmetric session-less operations */
 
 
 /**
-- 
2.1.0