Commit cd556e40 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by David S. Miller

devlink: expand the devlink-info documentation

We are having multiple review cycles with all vendors trying
to implement devlink-info. Let's expand the documentation with
more information about what's implemented and motivation behind
this interface in an attempt to make the implementations easier.

Describe what each info section is supposed to contain, and make
some references to other HW interfaces (PCI caps).

Document how firmware management is expected to look, to make
it clear how devlink-info and devlink-flash work in concert.

Name some future work.

v2: - improve wording
v3: - improve wording
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
Reviewed-by: default avatarRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2283a02b
.. SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
.. _devlink_flash:
=============
Devlink Flash
=============
The ``devlink-flash`` API allows updating device firmware. It replaces the
older ``ethtool-flash`` mechanism, and doesn't require taking any
networking locks in the kernel to perform the flash update. Example use::
$ devlink dev flash pci/0000:05:00.0 file flash-boot.bin
Note that the file name is a path relative to the firmware loading path
(usually ``/lib/firmware/``). Drivers may send status updates to inform
user space about the progress of the update operation.
Firmware Loading
================
Devices which require firmware to operate usually store it in non-volatile
memory on the board, e.g. flash. Some devices store only basic firmware on
the board, and the driver loads the rest from disk during probing.
``devlink-info`` allows users to query firmware information (loaded
components and versions).
In other cases the device can both store the image on the board, load from
disk, or automatically flash a new image from disk. The ``fw_load_policy``
devlink parameter can be used to control this behavior
(:ref:`Documentation/networking/devlink/devlink-params.rst <devlink_params_generic>`).
On-disk firmware files are usually stored in ``/lib/firmware/``.
Firmware Version Management
===========================
Drivers are expected to implement ``devlink-flash`` and ``devlink-info``
functionality, which together allow for implementing vendor-independent
automated firmware update facilities.
``devlink-info`` exposes the ``driver`` name and three version groups
(``fixed``, ``running``, ``stored``).
The ``driver`` attribute and ``fixed`` group identify the specific device
design, e.g. for looking up applicable firmware updates. This is why
``serial_number`` is not part of the ``fixed`` versions (even though it
is fixed) - ``fixed`` versions should identify the design, not a single
device.
``running`` and ``stored`` firmware versions identify the firmware running
on the device, and firmware which will be activated after reboot or device
reset.
The firmware update agent is supposed to be able to follow this simple
algorithm to update firmware contents, regardless of the device vendor:
.. code-block:: sh
# Get unique HW design identifier
$hw_id = devlink-dev-info['fixed']
# Find out which FW flash we want to use for this NIC
$want_flash_vers = some-db-backed.lookup($hw_id, 'flash')
# Update flash if necessary
if $want_flash_vers != devlink-dev-info['stored']:
$file = some-db-backed.download($hw_id, 'flash')
devlink-dev-flash($file)
# Find out the expected overall firmware versions
$want_fw_vers = some-db-backed.lookup($hw_id, 'all')
# Update on-disk file if necessary
if $want_fw_vers != devlink-dev-info['running']:
$file = some-db-backed.download($hw_id, 'disk')
write($file, '/lib/firmware/')
# Try device reset, if available
if $want_fw_vers != devlink-dev-info['running']:
devlink-reset()
# Reboot, if reset wasn't enough
if $want_fw_vers != devlink-dev-info['running']:
reboot()
Note that each reference to ``devlink-dev-info`` in this pseudo-code
is expected to fetch up-to-date information from the kernel.
For the convenience of identifying firmware files some vendors add
``bundle_id`` information to the firmware versions. This meta-version covers
multiple per-component versions and can be used e.g. in firmware file names
(all component versions could get rather long.)
......@@ -5,34 +5,119 @@ 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.
(hardware and firmware) information in a standard, extensible fashion.
devlink supports representing the following types of versions
The original motivation for the ``devlink-info`` API was twofold:
.. list-table:: List of version types
- making it possible to automate device and firmware management in a fleet
of machines in a vendor-independent fashion (see also
:ref:`Documentation/networking/devlink/devlink-flash.rst <devlink_flash>`);
- name the per component FW versions (as opposed to the crowded ethtool
version string).
``devlink-info`` supports reporting multiple types of objects. Reporting driver
versions is generally discouraged - here, and via any other Linux API.
.. list-table:: List of top level info objects
:widths: 5 95
* - Type
* - Name
- Description
* - ``driver``
- Name of the currently used device driver, also available through sysfs.
* - ``serial_number``
- Serial number of the device.
This is usually the serial number of the ASIC, also often available
in PCI config space of the device in the *Device Serial Number*
capability.
The serial number should be unique per physical device.
Sometimes the serial number of the device is only 48 bits long (the
length of the Ethernet MAC address), and since PCI DSN is 64 bits long
devices pad or encode additional information into the serial number.
One example is adding port ID or PCI interface ID in the extra two bytes.
Drivers should make sure to strip or normalize any such padding
or interface ID, and report only the part of the serial number
which uniquely identifies the hardware. In other words serial number
reported for two ports of the same device or on two hosts of
a multi-host device should be identical.
.. note:: ``devlink-info`` API should be extended with a new field
if devices want to report board/product serial number (often
reported in PCI *Vital Product Data* capability).
* - ``fixed``
- Represents fixed versions, which cannot change. For example,
- Group for hardware identifiers, and versions of components
which are not field-updatable.
Versions in this section identify the device design. For example,
component identifiers or the board version reported in the PCI VPD.
Data in ``devlink-info`` should be broken into the smallest logical
components, e.g. PCI VPD may concatenate various information
to form the Part Number string, while in ``devlink-info`` all parts
should be reported as separate items.
This group must not contain any frequently changing identifiers,
such as serial numbers. See
:ref:`Documentation/networking/devlink/devlink-flash.rst <devlink_flash>`
to understand why.
* - ``running``
- Represents the version of the currently running component. For
example the running version of firmware. These versions generally
only update after a reboot.
- Group for information about currently running software/firmware.
These versions often only update after a reboot, sometimes device reset.
* - ``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.
- Group for software/firmware versions in device flash.
Stored values must update to reflect changes in the flash even
if reboot has not yet occurred. If device is not capable of updating
``stored`` versions when new software is flashed, it must not report
them.
Each version can be reported at most once in each version group. Firmware
components stored on the flash should feature in both the ``running`` and
``stored`` sections, if device is capable of reporting ``stored`` versions
(see :ref:`Documentation/networking/devlink/devlink-flash.rst <devlink_flash>`).
In case software/firmware components are loaded from the disk (e.g.
``/lib/firmware``) only the running version should be reported via
the kernel API.
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.
version information. If a generic name for a given component doesn't exist yet,
driver authors should consult existing driver-specific versions and attempt
reuse. As last resort, if a component is truly unique, using driver-specific
names is allowed, but these should be documented in the driver-specific file.
All versions should try to use the following terminology:
.. list-table:: List of common version suffixes
:widths: 10 90
* - Name
- Description
* - ``id``, ``revision``
- Identifiers of designs and revision, mostly used for hardware versions.
* - ``api``
- Version of API between components. API items are usually of limited
value to the user, and can be inferred from other versions by the vendor,
so adding API versions is generally discouraged as noise.
* - ``bundle_id``
- Identifier of a distribution package which was flashed onto the device.
This is an attribute of a firmware package which covers multiple versions
for ease of managing firmware images (see
:ref:`Documentation/networking/devlink/devlink-flash.rst <devlink_flash>`).
``bundle_id`` can appear in both ``running`` and ``stored`` versions,
but it must not be reported if any of the components covered by the
``bundle_id`` was changed and no longer matches the version from
the bundle.
board.id
--------
......@@ -52,7 +137,7 @@ ASIC design identifier.
asic.rev
--------
ASIC design revision.
ASIC design revision/stepping.
board.manufacture
-----------------
......@@ -91,7 +176,8 @@ Network Controller Sideband Interface.
fw.psid
-------
Unique identifier of the firmware parameter set.
Unique identifier of the firmware parameter set. These are usually
parameters of a particular board, defined at manufacturing time.
fw.roce
-------
......@@ -103,3 +189,18 @@ fw.bundle_id
------------
Unique identifier of the entire firmware bundle.
Future work
===========
The following extensions could be useful:
- product serial number - NIC boards often get labeled with a board serial
number rather than ASIC serial number; it'd be useful to add board serial
numbers to the API if they can be retrieved from the device;
- on-disk firmware file names - drivers list the file names of firmware they
may need to load onto devices via the ``MODULE_FIRMWARE()`` macro. These,
however, are per module, rather than per device. It'd be useful to list
the names of firmware files the driver will try to load for a given device,
in order of priority.
......@@ -41,6 +41,8 @@ In order for ``driverinit`` parameters to take effect, the driver must
support reloading via the ``devlink-reload`` command. This command will
request a reload of the device driver.
.. _devlink_params_generic:
Generic configuration parameters
================================
The following is a list of generic configuration parameters that drivers may
......
......@@ -16,6 +16,7 @@ general.
devlink-dpipe
devlink-health
devlink-info
devlink-flash
devlink-params
devlink-region
devlink-resource
......
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