[PATCH v3 3/4] crypto: add asym session user data API

[Ciara Power <ciara.power@intel.com>]

A user data field is added to the asymmetric session structure.
Relevant API added to get/set the field.

Signed-off-by: Ciara Power <ciara.power@intel.com>
Acked-by: Fan Zhang <roy.fan.zhang@intel.com>
Acked-by: Anoob Joseph <anoobj@marvell.com>

---
v2: Corrected order of version map entries.
v3:
  - Corrected formatting of struct comments.
  - Added setting user data size in pool creation.
  - Added documentation.
---
 app/test/test_cryptodev_asym.c          |  2 +-
 doc/guides/prog_guide/cryptodev_lib.rst | 21 ++++++++++++-
 doc/guides/rel_notes/release_22_03.rst  |  6 +++-
 lib/cryptodev/cryptodev_pmd.h           |  4 ++-
 lib/cryptodev/rte_cryptodev.c           | 40 ++++++++++++++++++++++---
 lib/cryptodev/rte_cryptodev.h           | 34 ++++++++++++++++++++-
 lib/cryptodev/rte_cryptodev_trace.h     |  3 +-
 lib/cryptodev/version.map               |  2 ++
 8 files changed, 102 insertions(+), 10 deletions(-)

diff --git a/app/test/test_cryptodev_asym.c b/app/test/test_cryptodev_asym.c
index f93f39af42..a81d6292f6 100644
--- a/app/test/test_cryptodev_asym.c
+++ b/app/test/test_cryptodev_asym.c
@@ -897,7 +897,7 @@ testsuite_setup(void)
 	}
 
 	ts_params->session_mpool = rte_cryptodev_asym_session_pool_create(
-			"test_asym_sess_mp", TEST_NUM_SESSIONS * 2, 0,
+			"test_asym_sess_mp", TEST_NUM_SESSIONS * 2, 0, 0,
 			SOCKET_ID_ANY);
 
 	TEST_ASSERT_NOT_NULL(ts_params->session_mpool,
diff --git a/doc/guides/prog_guide/cryptodev_lib.rst b/doc/guides/prog_guide/cryptodev_lib.rst
index 56b19da3ae..62bd3577f5 100644
--- a/doc/guides/prog_guide/cryptodev_lib.rst
+++ b/doc/guides/prog_guide/cryptodev_lib.rst
@@ -1110,6 +1110,25 @@ They operate on data buffer of type ``rte_crypto_param``.
 
 See *DPDK API Reference* for details on each rte_crypto_xxx_op_param struct
 
+Private user data
+~~~~~~~~~~~~~~~~~
+
+Similar to symmetric above, asymmetric also has a set and get API that provides a
+mechanism for an application to store and retrieve the private user data information
+stored along with the crypto session.
+
+.. code-block:: c
+
+	int rte_cryptodev_asym_session_set_user_data(void *sess,
+		void *data, uint16_t size);
+
+	void * rte_cryptodev_asym_session_get_user_data(void *sess);
+
+Please note the ``size`` passed to set API cannot be bigger than the predefined
+``user_data_sz`` when creating the session mempool, otherwise the function will
+return an error. Also when ``user_data_sz`` was defined as ``0`` when
+creating the session mempool, the get API will always return ``NULL``.
+
 Asymmetric crypto Sample code
 -----------------------------
 
@@ -1166,7 +1185,7 @@ crypto operations is similar except change to respective op and xform setup).
      */
     asym_session_pool = rte_cryptodev_asym_session_pool_create(
                         "asym_session_pool", MAX_ASYM_SESSIONS, 0, 0,
-                        socket_id);
+                        0, socket_id);
 
     /* Configure the crypto device. */
     struct rte_cryptodev_config conf = {
diff --git a/doc/guides/rel_notes/release_22_03.rst b/doc/guides/rel_notes/release_22_03.rst
index c4a25f54cd..1022f77828 100644
--- a/doc/guides/rel_notes/release_22_03.rst
+++ b/doc/guides/rel_notes/release_22_03.rst
@@ -65,6 +65,10 @@ New Features
   * Added AES-XCBC support in lookaside protocol (IPsec) for CN9K & CN10K.
   * Added AES-CMAC support in CN9K & CN10K.
 
+* **Added an API for private user data in asymmetric session.**
+
+  An API was added for getting and setting an asymmetric session's user data.
+
 * **Added an API to retrieve event port id of ethdev Rx adapter.**
 
   The new API ``rte_event_eth_rx_adapter_event_port_get()`` was added.
@@ -104,7 +108,7 @@ API Changes
   and moved to ``cryptodev_pmd.h``, hiding it from applications.
   A ``rte_cryptodev_asym_session_pool_create`` function was added to
   create a mempool with element size to hold the generic asym session header,
-  along with the max size for a device private session data.
+  along with the max size for a device private session data, and user data size.
   ``rte_cryptodev_asym_session_init`` was removed as this initialisation is
   now done by ``rte_cryptodev_asym_session_create``.
 
diff --git a/lib/cryptodev/cryptodev_pmd.h b/lib/cryptodev/cryptodev_pmd.h
index d21db89837..a866440b0b 100644
--- a/lib/cryptodev/cryptodev_pmd.h
+++ b/lib/cryptodev/cryptodev_pmd.h
@@ -636,7 +636,9 @@ __extension__ struct rte_cryptodev_asym_session {
 	/**< Session driver ID. */
 	uint16_t max_priv_session_sz;
 	/**< Size of private session data used when creating mempool */
-	uint8_t padding[5];
+	uint16_t user_data_sz;
+	/**< Session user data will be placed after sess_data */
+	uint8_t padding[3];
 	uint8_t sess_private_data[0];
 };
 
diff --git a/lib/cryptodev/rte_cryptodev.c b/lib/cryptodev/rte_cryptodev.c
index a839abe34d..0d816ed4a9 100644
--- a/lib/cryptodev/rte_cryptodev.c
+++ b/lib/cryptodev/rte_cryptodev.c
@@ -210,6 +210,8 @@ struct rte_cryptodev_sym_session_pool_private_data {
 struct rte_cryptodev_asym_session_pool_private_data {
 	uint16_t max_priv_session_sz;
 	/**< Size of private session data used when creating mempool */
+	uint16_t user_data_sz;
+	/**< Session user data will be placed after sess_private_data */
 };
 
 int
@@ -1803,7 +1805,7 @@ rte_cryptodev_sym_session_pool_create(const char *name, uint32_t nb_elts,
 
 struct rte_mempool *
 rte_cryptodev_asym_session_pool_create(const char *name, uint32_t nb_elts,
-	uint32_t cache_size, int socket_id)
+	uint32_t cache_size, uint16_t user_data_size, int socket_id)
 {
 	struct rte_mempool *mp;
 	struct rte_cryptodev_asym_session_pool_private_data *pool_priv;
@@ -1821,7 +1823,8 @@ rte_cryptodev_asym_session_pool_create(const char *name, uint32_t nb_elts,
 		return NULL;
 	}
 
-	obj_sz = rte_cryptodev_asym_get_header_session_size() + max_priv_sz;
+	obj_sz = rte_cryptodev_asym_get_header_session_size() + max_priv_sz +
+			user_data_size;
 	obj_sz_aligned =  RTE_ALIGN_CEIL(obj_sz, RTE_CACHE_LINE_SIZE);
 
 	mp = rte_mempool_create(name, nb_elts, obj_sz_aligned, cache_size,
@@ -1842,9 +1845,10 @@ rte_cryptodev_asym_session_pool_create(const char *name, uint32_t nb_elts,
 		return NULL;
 	}
 	pool_priv->max_priv_session_sz = max_priv_sz;
+	pool_priv->user_data_sz = user_data_size;
 
 	rte_cryptodev_trace_asym_session_pool_create(name, nb_elts,
-		cache_size, mp);
+		user_data_size, cache_size, mp);
 	return mp;
 }
 
@@ -1958,12 +1962,13 @@ rte_cryptodev_asym_session_create(struct rte_mempool *mp, uint8_t dev_id,
 	}
 
 	sess->driver_id = dev->driver_id;
+	sess->user_data_sz = pool_priv->user_data_sz;
 	sess->max_priv_session_sz = pool_priv->max_priv_session_sz;
 
 	/* Clear device session pointer.
 	 * Include the flag indicating presence of private data
 	 */
-	memset(sess->sess_private_data, 0, session_priv_data_sz);
+	memset(sess->sess_private_data, 0, session_priv_data_sz + sess->user_data_sz);
 
 	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->asym_session_configure, NULL);
 
@@ -2173,6 +2178,33 @@ rte_cryptodev_sym_session_get_user_data(
 	return (void *)(sess->sess_data + sess->nb_drivers);
 }
 
+int
+rte_cryptodev_asym_session_set_user_data(void *session, void *data, uint16_t size)
+{
+	struct rte_cryptodev_asym_session *sess = session;
+	if (sess == NULL)
+		return -EINVAL;
+
+	if (sess->user_data_sz < size)
+		return -ENOMEM;
+
+	rte_memcpy(sess->sess_private_data +
+			sess->max_priv_session_sz,
+			data, size);
+	return 0;
+}
+
+void *
+rte_cryptodev_asym_session_get_user_data(void *session)
+{
+	struct rte_cryptodev_asym_session *sess = session;
+	if (sess == NULL || sess->user_data_sz == 0)
+		return NULL;
+
+	return (void *)(sess->sess_private_data +
+			sess->max_priv_session_sz);
+}
+
 static inline void
 sym_crypto_fill_status(struct rte_crypto_sym_vec *vec, int32_t errnum)
 {
diff --git a/lib/cryptodev/rte_cryptodev.h b/lib/cryptodev/rte_cryptodev.h
index af328de896..6a4d6d9934 100644
--- a/lib/cryptodev/rte_cryptodev.h
+++ b/lib/cryptodev/rte_cryptodev.h
@@ -959,6 +959,8 @@ rte_cryptodev_sym_session_pool_create(const char *name, uint32_t nb_elts,
  *   The number of elements in the mempool.
  * @param cache_size
  *   The number of per-lcore cache elements
+ * @param user_data_size
+ *   The size of user data to be placed after session private data.
  * @param socket_id
  *   The *socket_id* argument is the socket identifier in the case of
  *   NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA
@@ -971,7 +973,7 @@ rte_cryptodev_sym_session_pool_create(const char *name, uint32_t nb_elts,
 __rte_experimental
 struct rte_mempool *
 rte_cryptodev_asym_session_pool_create(const char *name, uint32_t nb_elts,
-	uint32_t cache_size, int socket_id);
+	uint32_t cache_size, uint16_t user_data_size, int socket_id);
 
 /**
  * Create symmetric crypto session header (generic with no private data)
@@ -1213,6 +1215,36 @@ void *
 rte_cryptodev_sym_session_get_user_data(
 					struct rte_cryptodev_sym_session *sess);
 
+/**
+ * Store user data in an asymmetric session.
+ *
+ * @param	sess		Session pointer allocated by
+ *				*rte_cryptodev_asym_session_create*.
+ * @param	data		Pointer to the user data.
+ * @param	size		Size of the user data.
+ *
+ * @return
+ *  - On success, zero.
+ *  - On failure, a negative value.
+ */
+__rte_experimental
+int
+rte_cryptodev_asym_session_set_user_data(void *sess, void *data, uint16_t size);
+
+/**
+ * Get user data stored in an asymmetric session.
+ *
+ * @param	sess		Session pointer allocated by
+ *				*rte_cryptodev_asym_session_create*.
+ *
+ * @return
+ *  - On success return pointer to user data.
+ *  - On failure returns NULL.
+ */
+__rte_experimental
+void *
+rte_cryptodev_asym_session_get_user_data(void *sess);
+
 /**
  * Perform actual crypto processing (encrypt/digest or auth/decrypt)
  * on user provided data.
diff --git a/lib/cryptodev/rte_cryptodev_trace.h b/lib/cryptodev/rte_cryptodev_trace.h
index 82ef876c72..0980c7d7af 100644
--- a/lib/cryptodev/rte_cryptodev_trace.h
+++ b/lib/cryptodev/rte_cryptodev_trace.h
@@ -86,9 +86,10 @@ RTE_TRACE_POINT(
 RTE_TRACE_POINT(
 	rte_cryptodev_trace_asym_session_pool_create,
 	RTE_TRACE_POINT_ARGS(const char *name, uint32_t nb_elts,
-		uint32_t cache_size, void *mempool),
+		uint16_t user_data_size, uint32_t cache_size, void *mempool),
 	rte_trace_point_emit_string(name);
 	rte_trace_point_emit_u32(nb_elts);
+	rte_trace_point_emit_u16(user_data_size);
 	rte_trace_point_emit_u32(cache_size);
 	rte_trace_point_emit_ptr(mempool);
 )
diff --git a/lib/cryptodev/version.map b/lib/cryptodev/version.map
index eaea976f21..3528aa44b1 100644
--- a/lib/cryptodev/version.map
+++ b/lib/cryptodev/version.map
@@ -103,7 +103,9 @@ EXPERIMENTAL {
 	rte_cryptodev_remove_enq_callback;
 
 	# added 22.03
+	rte_cryptodev_asym_session_get_user_data;
 	rte_cryptodev_asym_session_pool_create;
+	rte_cryptodev_asym_session_set_user_data;
 	__rte_cryptodev_trace_asym_session_pool_create;
 };
 
-- 
2.25.1