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

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Date:   Wed, 19 Aug 2020 17:23:25 +0300
From:   Moshe Shemesh <moshe@...dia.com>
To:     Jiri Pirko <jiri@...nulli.us>
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


On 8/19/2020 3:46 PM, Jiri Pirko wrote:
> 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.


Such counters can be useful for debugging, telling which reload actions 
were done on this dev from the point it was up.