+
+static void
+mlx5_crypto_sym_session_clear(struct rte_cryptodev *dev,
+			      struct rte_cryptodev_sym_session *sess)
+{
+	struct mlx5_crypto_priv *priv = dev->data->dev_private;
+	struct mlx5_crypto_session *sess_private_data =
+			get_sym_session_private_data(sess, dev->driver_id);
+
+	if (unlikely(sess_private_data == NULL)) {
+		DRV_LOG(ERR, "Failed to get session %p private data.",
+				sess_private_data);
+		return;
+	}
+	mlx5_crypto_dek_destroy(priv, sess_private_data->dek);
+	DRV_LOG(DEBUG, "Session %p was cleared.", sess_private_data);
+}

Memory leakage, mempool is not freed.
IMO, this driver is not properly tested with the unit test app.
Please add a note in the documentation that it is tested with autotest.