netdev - Re: [patch iproute2-next v2] devlink: add reload failed indication

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Date:   Thu, 19 Sep 2019 08:49:42 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, stephen@...workplumber.org,
        idosch@...lanox.com, jakub.kicinski@...ronome.com,
        tariqt@...lanox.com, mlxsw@...lanox.com
Subject: Re: [patch iproute2-next v2] devlink: add reload failed indication

On 9/18/19 2:23 PM, Jiri Pirko wrote:
> Wed, Sep 18, 2019 at 10:01:31PM CEST, dsahern@...il.com wrote:
>> On 9/18/19 1:37 AM, Jiri Pirko wrote:
>>> Wed, Sep 18, 2019 at 01:46:13AM CEST, dsahern@...il.com wrote:
>>>> On 9/17/19 12:36 PM, Jiri Pirko wrote:
>>>>> Tue, Sep 17, 2019 at 06:46:31PM CEST, dsahern@...il.com wrote:
>>>>>> On 9/16/19 3:44 AM, Jiri Pirko wrote:
>>>>>>> From: Jiri Pirko <jiri@...lanox.com>
>>>>>>>
>>>>>>> Add indication about previous failed devlink reload.
>>>>>>>
>>>>>>> Example outputs:
>>>>>>>
>>>>>>> $ devlink dev
>>>>>>> netdevsim/netdevsim10: reload_failed true
>>>>>>
>>>>>> odd output to user. Why not just "reload failed"?
>>>>>
>>>>> Well it is common to have "name value". The extra space would seem
>>>>> confusing for the reader..
>>>>> Also it is common to have "_" instead of space for the output in cases
>>>>> like this.
>>>>>
>>>>
>>>> I am not understanding your point.
>>>>
>>>> "reload failed" is still a name/value pair. It is short and to the point
>>>> as to what it indicates. There is no need for the name in the uapi (ie.,
>>>> the name of the netlink attribute) to be dumped here.
>>>
>>> Ah, got it. Well it is a bool value, that means it is "true" or "false".
>>> In json output, it is True of False. App processing json would have to
>>> handle this case in a special way.
>>>
>>
>> Technically it is a u8. But really I do not understand why it is
>> RELOAD_FAILED and not RELOAD_STATUS which is more generic and re-usable.
>> e.g,. 'none', 'failed', 'success'.
> 
> I was thinking about that. But I was not able to figure out any other
> possible values. So it is bool. For indication of some other status,
> there would have to be independent bool/othertype anyway.
> 

applied to iproute2-next, but I think this API is reactionary and not
very good from a user perspective.