[dpdk-dev] [PATCH v3] doc: add info on multiple instance SW crypto

[Vipin Varghese <vipin.varghese@intel.com>]

Add infomration to explain applications using multiple instances of sw
crypto with example.

Signed-off-by: Vipin Varghese <vipin.varghese@intel.com>
---

V3 Changes:
 - moved the multiple sw crypto to more generic place holder - Pablo

V2 Changes:
 - Updated Note for better wording - Pablo
 - Multiple instance information to Crypto Device Lib - Pablo
---
 doc/guides/prog_guide/cryptodev_lib.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/doc/guides/prog_guide/cryptodev_lib.rst b/doc/guides/prog_guide/cryptodev_lib.rst
index 2b338b9..d11e377 100644
--- a/doc/guides/prog_guide/cryptodev_lib.rst
+++ b/doc/guides/prog_guide/cryptodev_lib.rst
@@ -70,6 +70,15 @@ From the command line using the --vdev EAL option
 
    --vdev  'crypto_aesni_mb0,max_nb_queue_pairs=2,max_nb_sessions=1024,socket_id=0'
 
+.. Note::
+
+   * If DPDK application requires multiple software crypto PMD devices then required
+     number of ``--vdev`` with appropriate libraries are to be added.
+
+   * An Application with crypto PMD instaces sharing the same library requires unique ID.
+
+   Example: ``--vdev  'crypto_aesni_mb0' --vdev  'crypto_aesni_mb1'``
+
 Our using the rte_vdev_init API within the application code.
 
 .. code-block:: c
-- 
1.9.1