[PATCH 7/7] doc: updates cnxk doc for new devargs

[Rahul Bhansali <rbhansali@marvell.com>]

Adds details of below nix devargs
- force_tail_drop
- disable_xqe_drop

Signed-off-by: Rahul Bhansali <rbhansali@marvell.com>
---
 doc/guides/nics/cnxk.rst | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/doc/guides/nics/cnxk.rst b/doc/guides/nics/cnxk.rst
index 35f95dcc0a..7f4ff7b4fb 100644
--- a/doc/guides/nics/cnxk.rst
+++ b/doc/guides/nics/cnxk.rst
@@ -470,6 +470,29 @@ Runtime Config Options
    With the above configuration, inline inbound IPsec post-processing
    should be done by the application.
 
+- ``Enable force tail drop feature`` (default ``0``)
+
+   Force tail drop can be enabled by specifying ``force_tail_drop`` ``devargs``
+   parameter.
+   This option is for OCTEON CN10K SoC family.
+
+   For example::
+
+      -a 0002:02:00.0,force_tail_drop=1
+
+   With the above configuration, descriptors are internally increased and back
+   pressures are optimized to avoid CQ full situation due to inflight packets.
+
+- ``Disable RQ XQE drop`` (default ``0``)
+
+   Rx XQE drop can be disabled by specifying ``disable_xqe_drop`` ``devargs``
+   parameter.
+   This option is for OCTEON CN10K SoC family.
+
+   For example::
+
+      -a 0002:02:00.0,disable_xqe_drop=1
+
 .. note::
 
    Above devarg parameters are configurable per device, user needs to pass the
-- 
2.25.1