devlink: add documentation for octeontx2 driver

Add a file to document devlink support for octeontx2
driver. Driver-specific parameters implemented by
AF, PF and VF drivers are documented.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/devlink/index.rst

@@ -48,3 +48,4 @@ parameters, info versions, and other features it supports.
    am65-nuss-cpsw-switch
    prestera
    iosm
+   octeontx2

Documentation/networking/devlink/octeontx2.rst

+.. SPDX-License-Identifier: GPL-2.0
+
+=========================
+octeontx2 devlink support
+=========================
+
+This document describes the devlink features implemented by the ``octeontx2 AF, PF and VF``
+device drivers.
+
+Parameters
+==========
+
+The ``octeontx2 PF and VF`` drivers implement the following driver-specific parameters.
+
+.. list-table:: Driver-specific parameters implemented
+   :widths: 5 5 5 85
+
+   * - Name
+     - Type
+     - Mode
+     - Description
+   * - ``mcam_count``
+     - u16
+     - runtime
+     - Select number of match CAM entries to be allocated for an interface.
+       The same is used for ntuple filters of the interface. Supported by
+       PF and VF drivers.
+
+The ``octeontx2 AF`` driver implements the following driver-specific parameters.
+
+.. list-table:: Driver-specific parameters implemented
+   :widths: 5 5 5 85
+
+   * - Name
+     - Type
+     - Mode
+     - Description
+   * - ``dwrr_mtu``
+     - u32
+     - runtime
+     - Use to set the quantum which hardware uses for scheduling among transmit queues.
+       Hardware uses weighted DWRR algorithm to schedule among all transmit queues.