netdev - Re: [PATCH net] devlink: Fix error handling in param and info

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Date:   Fri, 27 Sep 2019 15:08:32 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>, Jiri Pirko <jiri@...lanox.com>,
        Michael Chan <michael.chan@...adcom.com>
Subject: Re: [PATCH net] devlink: Fix error handling in param and info_get
 dumpit cb

Fri, Sep 27, 2019 at 02:31:29PM CEST, andrew@...n.ch wrote:
>On Fri, Sep 27, 2019 at 10:28:36AM +0530, Vasundhara Volam wrote:
>> On Thu, Sep 26, 2019 at 5:57 PM Andrew Lunn <andrew@...n.ch> wrote:
>> >
>> > On Thu, Sep 26, 2019 at 03:05:54PM +0530, Vasundhara Volam wrote:
>> > > If any of the param or info_get op returns error, dumpit cb is
>> > > skipping to dump remaining params or info_get ops for all the
>> > > drivers.
>> > >
>> > > Instead skip only for the param/info_get op which returned error
>> > > and continue to dump remaining information, except if the return
>> > > code is EMSGSIZE.
>> >
>> > Hi Vasundhara
>> >
>> > How do we get to see something did fail? If it failed, it failed for a
>> > reason, and we want to know.
>> >
>> > What is your real use case here? What is failing, and why are you
>> > O.K. to skip this failure?
>> >
>> >      Andrew
>> Hi Andrew,
>> 
>> Thank you for looking into the patch.
>> 
>> If any of the devlink parameter is returning error like EINVAL, then
>> current code is not displaying any further parameters for all the other
>> devices as well.
>> 
>> In bnxt_en driver case, some of the parameters are not supported in
>> certain configurations like if the parameter is not part of the
>> NVM configuration, driver returns EINVAL error to the stack. And devlink is
>> skipping to display all the remaining parameters for that device and others
>> as well.
>> 
>> I am trying to fix to skip only the error parameter and display the remaining
>> parameters.
>
>Hi Vasundhara
>
>Thanks for explaining your use case. It sounds sensible. But i would
>narrow this down.
>
>Make the driver return EOPNOTSUP, not EINVAL. And then in dump, only
>skip EOPNOTSUP. Any other errors cause the error to be returned, so we
>get to see them.

Agreed, that would be more reasonable.

>
>   Andrew