Re: [dpdk-dev] [PATCH] ethdev: decrease log level for successful API

[Kevin Traynor <ktraynor@redhat.com>]

On 08/02/2018 07:01 PM, Andrew Rybchenko wrote:
> On 02.08.2018 19:14, Thomas Monjalon wrote:
>> 02/08/2018 16:52, Kevin Traynor:
>>> On 08/02/2018 03:41 PM, Andrew Rybchenko wrote:
>>>> On 02.08.2018 17:09, Kevin Traynor wrote:
>>>>> On 08/02/2018 02:52 PM, Andrew Rybchenko wrote:
>>>>>> On 02.08.2018 16:35, Kevin Traynor wrote:
>>>>>>> On 08/02/2018 01:59 PM, Andrew Rybchenko wrote:
>>>>>>>> On 02.08.2018 15:33, Kevin Traynor wrote:
>>>>>>>>> @@ -1319,5 +1319,5 @@ struct rte_eth_dev *
>>>>>>>>>            if (dev->data->dev_started == 0) {
>>>>>>>>> -        RTE_ETHDEV_LOG(ERR,
>>>>>>>>> +        RTE_ETHDEV_LOG(DEBUG,
>>>>>>>>>                  "Device with port_id=%"PRIu16" already
>>>>>>>>> stopped\n",
>>>>>>>>>                  port_id);
>>>>>>>> I would suggest to use WARNING here. Yes, it is not an error since
>>>>>>>> nothing bad has
>>>>>>>> happened and we handle duplicate stop and duplicate start,
>>>>>>>> but I think it is bad that (buggy?) application does it. Making it
>>>>>>>> debug
>>>>>>>> we simply
>>>>>>>> hide it too much.
>>>>>>>>
>>>>>>> I think an application following the documented API is not bad or
>>>>>>> buggy.
>>>>>> I've failed to find the place were it is documented that device/queue
>>>>>> may be stopped/started twice. Could you point out?
>>>>>> Yes, return value 0 means success, but it is a separate thing.
>>>>>>
>>>>> I was commenting directly on the API and it's documentation e.g. below
>>>>> for dev start. I'm not aware of other documentation specifying how it
>>>>> can/cannot be called.
>>>> I would not say so. "0: Success. Ethernet device started" means that
>>>> function managed to do the job and finally the device is started.
>>>>
>>>> Never-mind it is not that important and already paid to much attention.
>>>> I've included in CC other ethdev maintainers (who should be there from
>>>> the very beginning). I don't mind if it is acked by other ethdev
>>>> maintainer
>>>> and applied. It is definitely not an error as it is now. Thanks.
>>>>
>>> Sure, sounds good - I'm glad we agree on something :-) I'll leave it for
>>> a day and can re-spin tomorrow.
>> I would like to give an opinion, but unfortunately it's hard to decide.
>> For sure, it should not be a WARNING level (used for non-fatal errors).
>> What else do we have? NOTICE, INFO and DEBUG.
>> I think it can be INFO.
> 
> So, we have ERR (now), WARNING (my initial suggestion), NOTICE
> (by Stephen), INFO (by Thomas) and DEBUG (by Kevin)  :)
> 

Well, we completed the set :-)

> If it is not treated as an error in application behaviour, I agree that my
> suggestion of WARNING is not suitable. Typically NOTICE is the default
> log level and if we consider such behaviour of apps correct, it should
> be INFO to be silent by default. I really don't like DEBUG since these
> messages are still important and could be simply lost in DEBUG
> which could to be very-very verbose.

ok, I'll update and send as INFO before someone suggests adding new log
levels to choose from.