i40e: Align devlink info versions with ice driver and add docs

Align devlink info versions with ice driver so change 'fw.mgmt'
version to be 2-digit version [major.minor], add 'fw.mgmt.build'
that reports mgmt firmware build number and use '"fw.psid.api'
for NVM format version instead of incorrect '"fw.psid'.
Additionally add missing i40e devlink documentation.

Fixes: 5a423552e0 ("i40e: Add handler for devlink .info_get")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20231018123558.552453-1-ivecera@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/networking/devlink/i40e.rst

@@ -0,0 +1,59 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+====================
+i40e devlink support
+====================
+
+This document describes the devlink features implemented by the ``i40e``
+device driver.
+
+Info versions
+=============
+
+The ``i40e`` driver reports the following versions
+
+.. list-table:: devlink info versions implemented
+    :widths: 5 5 5 90
+
+    * - Name
+      - Type
+      - Example
+      - Description
+    * - ``board.id``
+      - fixed
+      - K15190-000
+      - The Product Board Assembly (PBA) identifier of the board.
+    * - ``fw.mgmt``
+      - running
+      - 9.130
+      - 2-digit version number of the management firmware that controls the
+        PHY, link, etc.
+    * - ``fw.mgmt.api``
+      - running
+      - 1.15
+      - 2-digit version number of the API exported over the AdminQ by the
+        management firmware. Used by the driver to identify what commands
+        are supported.
+    * - ``fw.mgmt.build``
+      - running
+      - 73618
+      - Build number of the source for the management firmware.
+    * - ``fw.undi``
+      - running
+      - 1.3429.0
+      - Version of the Option ROM containing the UEFI driver. The version is
+        reported in ``major.minor.patch`` format. The major version is
+        incremented whenever a major breaking change occurs, or when the
+        minor version would overflow. The minor version is incremented for
+        non-breaking changes and reset to 1 when the major version is
+        incremented. The patch version is normally 0 but is incremented when
+        a fix is delivered as a patch against an older base Option ROM.
+    * - ``fw.psid.api``
+      - running
+      - 9.30
+      - Version defining the format of the flash contents.
+    * - ``fw.bundle_id``
+      - running
+      - 0x8000e5f3
+      - Unique identifier of the firmware image file that was loaded onto
+        the device. Also referred to as the EETRACK identifier of the NVM.

Documentation/networking/devlink/index.rst

@@ -80,6 +80,7 @@ parameters, info versions, and other features it supports.
    bnxt
    etas_es58x
    hns3
+   i40e
    ionic
    ice
    mlx4