doc: add flow API to features list

[dpdk.git] / doc / guides / cryptodevs / null.rst

diff --git a/doc/guides/cryptodevs/null.rst b/doc/guides/cryptodevs/null.rst
index 3ea4d21..ec5bc70 100644 (file)
--- a/doc/guides/cryptodevs/null.rst
+++ b/doc/guides/cryptodevs/null.rst
@@ -27,7 +27,7 @@
     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-Null Crytpo Poll Mode Driver
+Null Crypto Poll Mode Driver
 ============================
 
 The Null Crypto PMD (**librte_pmd_null_crypto**) provides a crypto poll mode
@@ -70,3 +70,27 @@ Installation
 
 The Null Crypto PMD is enabled and built by default in both the Linux and
 FreeBSD builds.
+
+Initialization
+--------------
+
+To use the PMD in an application, user must:
+
+* Call rte_eal_vdev_init("crypto_null") within the application.
+
+* Use --vdev="crypto_null" in the EAL options, which will call rte_eal_vdev_init() internally.
+
+The following parameters (all optional) can be provided in the previous two calls:
+
+* socket_id: Specify the socket where the memory for the device is going to be allocated
+  (by default, socket_id will be the socket where the core that is creating the PMD is running on).
+
+* max_nb_queue_pairs: Specify the maximum number of queue pairs in the device (8 by default).
+
+* max_nb_sessions: Specify the maximum number of sessions that can be created (2048 by default).
+
+Example:
+
+.. code-block:: console
+
+    ./l2fwd-crypto -c 40 -n 4 --vdev="crypto_null,socket_id=1,max_nb_sessions=128"