Add table for environment variables used by cnxk drivers.

Signed-off-by: Nithin Dabilpuram <ndabilpu...@marvell.com>
---
 doc/guides/platform/cnxk.rst | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/doc/guides/platform/cnxk.rst b/doc/guides/platform/cnxk.rst
index 97e38c8..1cce2f9 100644
--- a/doc/guides/platform/cnxk.rst
+++ b/doc/guides/platform/cnxk.rst
@@ -606,3 +606,24 @@ CN10K:
    if Marvell toolchain is available then it can be used by overriding the
    c, cpp, ar, strip ``binaries`` attributes to respective Marvell
    toolchain binaries in ``config/arm/arm64_cn10k_linux_gcc`` file.
+
+Environment Variables
+~~~~~~~~~~~~~~~~~~~~~
+
+.. table:: cnxk environment variables
+
+   
+---+-----------------------------+-----------------------------------------+
+   | # | Variable name               | Usage                                   
|
+   
+===+=============================+=========================================+
+   | 1 | BPHY_INTR_MLOCK_DISABLE     | When defined disables memory locking in 
|
+   |   |                             | BPHY environment.                       
|
+   
+---+-----------------------------+-----------------------------------------+
+   | 2 | ROC_CN10K_MBOX_TIMEOUT      | When set, overrides MBOX timeout by     
|
+   |   | ROC_MBOX_TIMEOUT            | value in milli seconds.                 
|
+   
+---+-----------------------------+-----------------------------------------+
+   | 3 | CN10K_ETH_SEC_IV_OVR        | When set, overrides outbound inline SA  
|
+   |   |                             | IV in CN10K. By default IV is generated 
|
+   |   |                             | by HW. Format of variable is string     
|
+   |   |                             | of comma separated one byte values as   
|
+   |   |                             | for ex: "0x0, 0x10, 0x20, ..."          
|
+   
+---+-----------------------------+-----------------------------------------+
-- 
2.8.4

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