linux-kernel - Re: [PATCH net-next RFC v2 13/13] devlink: Add Documentation/networking/devlink/devlink-reload.rst

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Message-ID: <20200818110740.GC2627@nanopsycho>
Date:   Tue, 18 Aug 2020 13:07:40 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Moshe Shemesh <moshe@...dia.com>
Cc:     Moshe Shemesh <moshe@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next RFC v2 13/13] devlink: Add
 Documentation/networking/devlink/devlink-reload.rst

Tue, Aug 18, 2020 at 11:14:16AM CEST, moshe@...dia.com wrote:
>
>On 8/17/2020 7:39 PM, Jiri Pirko wrote:
>> Mon, Aug 17, 2020 at 11:37:52AM CEST, moshe@...lanox.com wrote:
>> > Add devlink reload rst documentation file.
>> > Update index file to include it.
>> > 
>> > Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
>> > ---
>> > - Instead of reload levels driver,fw_reset,fw_live_patch have reload
>> >   actions driver_reinit,fw_activate,fw_live_patch
>> > ---
>> > .../networking/devlink/devlink-reload.rst     | 54 +++++++++++++++++++
>> > Documentation/networking/devlink/index.rst    |  1 +
>> > 2 files changed, 55 insertions(+)
>> > create mode 100644 Documentation/networking/devlink/devlink-reload.rst
>> > 
>> > diff --git a/Documentation/networking/devlink/devlink-reload.rst b/Documentation/networking/devlink/devlink-reload.rst
>> > new file mode 100644
>> > index 000000000000..9846ea727f3b
>> > --- /dev/null
>> > +++ b/Documentation/networking/devlink/devlink-reload.rst
>> > @@ -0,0 +1,54 @@
>> > +.. SPDX-License-Identifier: GPL-2.0
>> > +
>> > +==============
>> > +Devlink Reload
>> > +==============
>> > +
>> > +``devlink-reload`` provides mechanism to either reload driver entities,
>> > +applying ``devlink-params`` and ``devlink-resources`` new values or firmware
>> > +activation depends on reload action selected.
>> > +
>> > +Reload actions
>> > +=============
>> > +
>> > +User may select a reload action.
>> > +By default ``driver_reinit`` action is done.
>> > +
>> > +.. list-table:: Possible reload actions
>> > +   :widths: 5 90
>> > +
>> > +   * - Name
>> > +     - Description
>> > +   * - ``driver-reinit``
>> > +     - Driver entities re-initialization, including applying
>> > +       new values to devlink entities which are used during driver
>> > +       load such as ``devlink-params`` in configuration mode
>> > +       ``driverinit`` or ``devlink-resources``
>> > +   * - ``fw_activate``
>> > +     - Firmware activate. Can be used for firmware reload or firmware
>> > +       upgrade if new firmware is stored and driver supports such
>> > +       firmware upgrade.
>> Does this do the same as "driver-reinit" + fw activation? If yes, it
>> should be written here. If no, it should be written here as well.
>> 
>
>No, The only thing required here is the action of firmware activation. If a
>driver needs to do reload to make that happen and do reinit that's ok, but
>not required.

What does the "FW activation" mean? I believe that this needs explicit
documentation here.


>
>> > +   * - ``fw_live_patch``
>> > +     - Firmware live patch, applies firmware changes without reset.
>> > +
>> > +Change namespace
>> > +================
>> > +
>> > +All devlink instances are created in init_net and stay there for a
>> > +lifetime. Allow user to be able to move devlink instances into
>> > +namespaces during devlink reload operation. That ensures proper
>> > +re-instantiation of driver objects, including netdevices.
>> > +
>> > +example usage
>> > +-------------
>> > +
>> > +.. code:: shell
>> > +
>> > +    $ devlink dev reload help
>> > +    $ devlink dev reload DEV [ netns { PID | NAME | ID } ] [ action { fw_live_patch | driver_reinit | fw_activate } ]
>> > +
>> > +    # Run reload command for devlink driver entities re-initialization:
>> > +    $ devlink dev reload pci/0000:82:00.0 action driver_reinit
>> > +
>> > +    # Run reload command to activate firmware:
>> > +    $ devlink dev reload pci/0000:82:00.0 action fw_activate
>> > diff --git a/Documentation/networking/devlink/index.rst b/Documentation/networking/devlink/index.rst
>> > index 7684ae5c4a4a..d82874760ae2 100644
>> > --- a/Documentation/networking/devlink/index.rst
>> > +++ b/Documentation/networking/devlink/index.rst
>> > @@ -20,6 +20,7 @@ general.
>> >     devlink-params
>> >     devlink-region
>> >     devlink-resource
>> > +   devlink-reload
>> >     devlink-trap
>> > 
>> > Driver-specific documentation
>> > -- 
>> > 2.17.1
>> >