netdev - Re: [PATCH net-next 0/8] bnxt_en: devlink param updates

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Message-ID: <CAACQVJp2Lg0E+i3nKuxVTH6v7zZOGsQur1sOr2Qb=kPvcU_XuA@mail.gmail.com>
Date:   Wed, 12 Sep 2018 12:10:44 +0530
From:   Vasundhara Volam <vasundhara-v.volam@...adcom.com>
To:     Jiří Pírko <jiri@...nulli.us>
Cc:     jakub.kicinski@...ronome.com, David Miller <davem@...emloft.net>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        Netdev <netdev@...r.kernel.org>, alexander.duyck@...il.com
Subject: Re: [PATCH net-next 0/8] bnxt_en: devlink param updates

On Tue, Sep 11, 2018 at 5:25 PM Jiri Pirko <jiri@...nulli.us> wrote:
>
> Tue, Sep 11, 2018 at 01:33:51PM CEST, jakub.kicinski@...ronome.com wrote:
> >On Tue, 11 Sep 2018 14:14:57 +0530, Vasundhara Volam wrote:
> >> This patchset adds support for 4 generic and 1 driver-specific devlink
> >> parameters.
> >>
> >> Also, this patchset adds support to return proper error code if
> >> HWRM_NVM_GET/SET_VARIABLE commands return error code
> >> HWRM_ERR_CODE_RESOURCE_ACCESS_DENIED.
> >>
> >> Vasundhara Volam (8):
> >>   devlink: Add generic parameter hw_tc_offload
> >
> >Much like Jiri, I can't help but wonder why do you need this?
> >
> >>   devlink: Add generic parameter ignore_ari
> >>   devlink: Add generic parameter msix_vec_per_pf_max
> >>   devlink: Add generic parameter msix_vec_per_pf_min
> >
> >IMHO more structured API would be preferable if possible.  The string
> >keys won't scale if you want to set the parameters per PF, and
> >creating more structured API for PCIe which is a relatively slow
> >moving HW spec seems tractable.
> >
> >Not to mention the question Alex posed before about where this knobs
> >should actually live.  I'm personally fine with devlink.
> >
> >>   bnxt_en: Use hw_tc_offload and ignore_ari devlink parameters
> >>   bnxt_en: return proper error when FW returns
> >>     HWRM_ERR_CODE_RESOURCE_ACCESS_DENIED
> >>   bnxt_en: Use msix_vec_per_pf_max and msix_vec_per_pf_min devlink
> >>     params.
> >>   bnxt_en: Add a driver specific devlink parameter.
> >
> >The details about the device specific devlink parameter are very much
> >lacking.  Why does the patch subject not mention any specifics?  What's
> >GRE in the first place?
> >
> >You really need to provide more details and docs for all these
> >parameters.
>
> We really need Documentation/networking/devlink-params.txt to describe
> these.
>
Sure. I will add the documentation in my next version of the patchset
for all generic and driver specific parameters.