devlink: rename devlink-info-versions.rst and add a header

Rename the devlink-info-versions.rst file to a plain devlink-info.rst
file. Add additional paragraphs explaining what devlink-info is for,
and the expectation that drivers use the generic names where plausible.

Note that drivers which use non-standard info version names ought to
document these in a driver-specific info-versions.rst file.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/devlink/devlink-info-versions.rst → Documentation/networking/devlink/devlink-info.rst

 .. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 
-=====================
-Devlink info versions
-=====================
+============
+Devlink Info
+============
+
+The ``devlink-info`` mechanism enables device drivers to report device
+information in a generic fashion. It is extensible, and enables exporting
+even device or driver specific information.
+
+devlink supports representing the following types of versions
+
+.. list-table:: List of version types
+   :widths: 5 95
+
+   * - Type
+     - Description
+   * - ``fixed``
+     - Represents fixed versions, which cannot change. For example,
+       component identifiers or the board version reported in the PCI VPD.
+   * - ``running``
+     - Represents the version of the currently running component. For
+       example the running version of firmware. These versions generally
+       only update after a reboot.
+   * - ``stored``
+     - Represents the version of a component as stored, such as after a
+       flash update. Stored values should update to reflect changes in the
+       flash even if a reboot has not yet occurred.
+
+Generic Versions
+================
+
+It is expected that drivers use the following generic names for exporting
+version information. Other information may be exposed using driver-specific
+names, but these should be documented in the driver-specific file.
 
 board.id
-========
+--------
 
 Unique identifier of the board design.
 
 board.rev
-=========
+---------
 
 Board design revision.
 
 asic.id
-=======
+-------
 
 ASIC design identifier.
 
 asic.rev
-========
+--------
 
 ASIC design revision.
 
 board.manufacture
-=================
+-----------------
 
 An identifier of the company or the facility which produced the part.
 
 fw
-==
+--
 
 Overall firmware version, often representing the collection of
 fw.mgmt, fw.app, etc.
 
 fw.mgmt
-=======
+-------
 
 Control unit firmware version. This firmware is responsible for house
 keeping tasks, PHY control etc. but not the packet-by-packet data path
 operation.
 
 fw.app
-======
+------
 
 Data path microcode controlling high-speed packet processing.
 
 fw.undi
-=======
+-------
 
 UNDI software, may include the UEFI driver, firmware or both.
 
 fw.ncsi
-=======
+-------
 
 Version of the software responsible for supporting/handling the
 Network Controller Sideband Interface.
 
 fw.psid
-=======
+-------
 
 Unique identifier of the firmware parameter set.

Documentation/networking/devlink/index.rst

@@ -10,6 +10,6 @@ Contents:
    :maxdepth: 1
 
    devlink-health
-   devlink-info-versions
+   devlink-info
    devlink-trap
    devlink-trap-netdevsim