[dpdk-dev] [RFC v2, 1/2] cryptodev: add support to set session private data

[Abhinandan Gujjar]

Update rte_crypto_op to indicate private data offset.

The application may want to store private data along with the
rte_cryptodev that is transparent to the rte_cryptodev layer.
For e.g., If an eventdev based application is submitting a
rte_cryptodev_sym_session operation and wants to indicate event
information required to construct a new event that will be
enqueued to eventdev after completion of the rte_cryptodev_sym_session
operation. This patch provides a mechanism for the application
to associate this information with the rte_cryptodev_sym_session session.
The application can set the private data using
rte_cryptodev_sym_session_set_private_data() and retrieve it using
rte_cryptodev_sym_session_get_private_data().

Signed-off-by: Abhinandan Gujjar <abhinandan.gujjar at intel.com>
Signed-off-by: Nikhil Rao <nikhil.rao at intel.com>
---
Notes:
        V2:
	1. Removed enum rte_crypto_op_private_data_type
	2. Corrected formatting

 lib/librte_cryptodev/rte_crypto.h    |  8 ++++++--
 lib/librte_cryptodev/rte_cryptodev.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/lib/librte_cryptodev/rte_crypto.h b/lib/librte_cryptodev/rte_crypto.h
index 95cf861..14c87c8 100644
--- a/lib/librte_cryptodev/rte_crypto.h
+++ b/lib/librte_cryptodev/rte_crypto.h
@@ -84,8 +84,12 @@ struct rte_crypto_op {
 	 */
 	uint8_t sess_type;
 	/**< operation session type */
-
-	uint8_t reserved[5];
+	uint16_t private_data_offset;
+	/**< Offset to indicate start of private data (if any). The private
+	 * data may be used by the application to store information which
+	 * should remain untouched in the library/driver
+	 */
+	uint8_t reserved[3];
 	/**< Reserved bytes to fill 64 bits for future additions */
 	struct rte_mempool *mempool;
 	/**< crypto operation mempool which operation is allocated from */
diff --git a/lib/librte_cryptodev/rte_cryptodev.h b/lib/librte_cryptodev/rte_cryptodev.h
index c8fa689..2f4affe 100644
--- a/lib/librte_cryptodev/rte_cryptodev.h
+++ b/lib/librte_cryptodev/rte_cryptodev.h
@@ -1037,6 +1037,38 @@ struct rte_cryptodev_sym_session *
  */
 const char *rte_cryptodev_driver_name_get(uint8_t driver_id);
 
+/**
+ * Set private data for a session.
+ *
+ * @param	sess		Session pointer allocated by
+ *				*rte_cryptodev_sym_session_create*.
+ * @param	data		Pointer to the private data.
+ * @param	size		Size of the private data.
+ *
+ * @return
+ *  - On success, zero.
+ *  - On failure, a negative value.
+ */
+int
+rte_cryptodev_sym_session_set_private_data(
+					struct rte_cryptodev_sym_session *sess,
+					void *data,
+					uint16_t size);
+
+/**
+ * Get private data of a session.
+ *
+ * @param	sess		Session pointer allocated by
+ *				*rte_cryptodev_sym_session_create*.
+ *
+ * @return
+ *  - On success return pointer to private data.
+ *  - On failure returns NULL.
+ */
+void *
+rte_cryptodev_sym_session_get_private_data(
+				const struct rte_cryptodev_sym_session *sess);
+
 #ifdef __cplusplus
 }
 #endif
-- 
1.9.1