cryptodev: remove mempool from session

Mempool pointer can be obtained from the object itself,
which means that it is not required to actually store the pointer
in the session.

Signed-off-by: Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>
Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Declan Doherty <declan.doherty@intel.com>
Acked-by: Akhil Goyal <akhil.goyal@nxp.com>

doc/guides/rel_notes/release_17_08.rst

@@ -115,6 +115,7 @@ New Features
 
   * ``dev_id`` field has been removed.
   * ``driver_id`` field has been removed.
+  * Mempool pointer ``mp`` has been removed.
 
 * **Updated cryptodev library.**
 

lib/librte_cryptodev/rte_cryptodev.c

@@ -1087,8 +1087,6 @@ rte_cryptodev_sym_session_init(struct rte_mempool *mp,
 {
 	memset(sess, 0, mp->elt_size);
 
-	sess->mp = mp;
-
 	if (dev->dev_ops->session_initialize)
 		(*dev->dev_ops->session_initialize)(mp, sess);
 }
@@ -1126,7 +1124,7 @@ rte_cryptodev_sym_session_create(uint8_t dev_id,
 				dev_id);
 
 		/* Return session to mempool */
-		rte_mempool_put(sess->mp, _sess);
+		rte_mempool_put(dev->data->session_pool, _sess);
 		return NULL;
 	}
 
@@ -1198,7 +1196,8 @@ rte_cryptodev_sym_session_free(uint8_t dev_id,
 	dev->dev_ops->session_clear(dev, (void *)sess->_private);
 
 	/* Return session to mempool */
-	rte_mempool_put(sess->mp, (void *)sess);
+	struct rte_mempool *mp = rte_mempool_from_obj(sess);
+	rte_mempool_put(mp, (void *)sess);
 
 	return NULL;
 }

lib/librte_cryptodev/rte_cryptodev.h

@@ -883,12 +883,6 @@ rte_cryptodev_enqueue_burst(uint8_t dev_id, uint16_t qp_id,
 /** Cryptodev symmetric crypto session */
 struct rte_cryptodev_sym_session {
 	RTE_STD_C11
-	struct {
-		struct rte_mempool *mp;
-		/**< Mempool session allocated from */
-	} __rte_aligned(8);
-	/**< Public symmetric session details */
-
 	__extension__ char _private[0];
 	/**< Private session material */
 };