linux-kernel - Re: [PATCH net-next RFC v2 01/13] devlink: Add reload action option to devlink reload command

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Message-ID: <20200819124616.GA2314@nanopsycho.orion>
Date:   Wed, 19 Aug 2020 14:46:16 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Moshe Shemesh <moshe@...dia.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Moshe Shemesh <moshe@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next RFC v2 01/13] devlink: Add reload action option
 to devlink reload command

Wed, Aug 19, 2020 at 02:18:22PM CEST, moshe@...dia.com wrote:
>
>On 8/19/2020 3:10 AM, Jakub Kicinski wrote:
>> 
>> On Tue, 18 Aug 2020 12:10:36 +0300 Moshe Shemesh wrote:
>> > On 8/17/2020 7:36 PM, Jiri Pirko wrote:
>> > > Mon, Aug 17, 2020 at 11:37:40AM CEST, moshe@...lanox.com wrote:
>> > > > Add devlink reload action to allow the user to request a specific reload
>> > > > action. The action parameter is optional, if not specified then devlink
>> > > > driver re-init action is used (backward compatible).
>> > > > Note that when required to do firmware activation some drivers may need
>> > > > to reload the driver. On the other hand some drivers may need to reset
>> > > Sounds reasonable. I think it would be good to indicate that though. Not
>> > > sure how...
>> > Maybe counters on the actions done ? Actually such counters can be
>> > useful on debug, knowing what reloads we had since driver was up.
>> Wouldn't we need to know all types of reset of drivers may do?
>
>
>Right, we can't tell all reset types driver may have, but we can tell which
>reload actions were done.
>
>> I think documenting this clearly should be sufficient.
>> 
>> A reset counter for the _requested_ reset type (fully maintained by
>> core), however - that may be useful. The question "why did this NIC
>> reset itself / why did the link just flap" comes up repeatedly.
>
>
>I will add counters on which reload were done. reload_down()/up() can return
>which actions were actually done and devlink will show counters.

Why a counter? Just return what was done over netlink reply.

>