[dpdk-stable] [PATCH 19.11] doc: add NASM installation steps

[Pablo de Lara]

[ upstream commit dede694cd58f6ee9c53f1e7d8d5960835bdc8fff ]

The intel-ipsec-mb library requires NASM as a dependency.
Steps on how to get and install NASM are added on the documentation
of the crypto PMDs which requires the library.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
---
 doc/guides/cryptodevs/aesni_gcm.rst | 13 +++++++++++++
 doc/guides/cryptodevs/aesni_mb.rst  | 13 +++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/doc/guides/cryptodevs/aesni_gcm.rst b/doc/guides/cryptodevs/aesni_gcm.rst
index 151aa30..a8ea320 100644
--- a/doc/guides/cryptodevs/aesni_gcm.rst
+++ b/doc/guides/cryptodevs/aesni_gcm.rst
@@ -45,6 +45,19 @@ can be downloaded in `<https://github.com/01org/intel-ipsec-mb/archive/v0.53.zip
     make
     make install
 
+The library requires NASM to be built. Depending on the library version, it might require a minimum NASM version (e.g. v0.53 requires at least NASM 2.13.03).
+
+NASM is packaged for different OS. However, on some OS the version is too old, so a manual installation is required.
+In that case, NASM can be downloaded from
+`NASM website <https://www.nasm.us/pub/nasm/releasebuilds/?C=M;O=D>`_.
+Once it is downloaded, extract it and follow these steps:
+
+.. code-block:: console
+
+    ./configure
+    make
+    make install
+
 As a reference, the following table shows a mapping between the past DPDK versions
 and the external crypto libraries supported by them:
 
diff --git a/doc/guides/cryptodevs/aesni_mb.rst b/doc/guides/cryptodevs/aesni_mb.rst
index 5d8fb46..ca6c169 100644
--- a/doc/guides/cryptodevs/aesni_mb.rst
+++ b/doc/guides/cryptodevs/aesni_mb.rst
@@ -72,6 +72,19 @@ can be downloaded from `<https://github.com/01org/intel-ipsec-mb/archive/v0.53.z
     make
     make install
 
+The library requires NASM to be built. Depending on the library version, it might require a minimum NASM version (e.g. v0.53 requires at least NASM 2.13.03).
+
+NASM is packaged for different OS. However, on some OS the version is too old, so a manual installation is required.
+In that case, NASM can be downloaded from
+`NASM website <https://www.nasm.us/pub/nasm/releasebuilds/?C=M;O=D>`_.
+Once it is downloaded, extract it and follow these steps:
+
+.. code-block:: console
+
+    ./configure
+    make
+    make install
+
 As a reference, the following table shows a mapping between the past DPDK versions
 and the Multi-Buffer library version supported by them:
 
-- 
2.7.5