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

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Date:   Fri, 27 Sep 2019 19:07:24 +0530
From:   Vasundhara Volam <vasundhara-v.volam@...adcom.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     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

On Fri, Sep 27, 2019 at 6:01 PM Andrew Lunn <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.
Thank you Andrew, I will modify the patch and resubmit.
>
>    Andrew