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

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Date:   Fri, 14 Sep 2018 12:01:29 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>
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

Fri, Sep 14, 2018 at 06:17:07AM CEST, vasundhara-v.volam@...adcom.com wrote:
>On Wed, Sep 12, 2018 at 3:20 PM Jakub Kicinski
><jakub.kicinski@...ronome.com> wrote:
>>
>> On Wed, 12 Sep 2018 12:09:37 +0530, Vasundhara Volam wrote:
>> > On Tue, Sep 11, 2018 at 5:04 PM Jakub Kicinski 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?
>> >
>> > There is a request from our customer for a way to toggle tc_offload
>> > feature in our adapter.
>>
>> Vasundhara, again, we don't need to know who asked you to do this, but
>> _why_.  What problem are you solving?  What is the customer trying to
>> achieve?
>For Brand new big features like TC_offload, few customers are not willing
>to enable it by default in the adapter(Firmware). This was a subjective decision
>to disable TC_offload by default in the adapter.

Again, why? Why it cannot be enabled in FW and just enabled/disabled by
ethtool flag? Don't say that "customers want it" please...


>>
>> > > >   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.
>> >
>> > Sorry, could you please suggest an example? We will try to adapt.
>>
>> My thinking was that the same way devlink device has ports, it should
>> have PCIe functions as objects which then have attributes.  Instead of
>> making everything a string-identified device attribute.  But I'm not
>> dead set on this if others don't think its a good idea.
>Actually this parameters are for the port but the value given to this param
>is applicable for individual PF. That's the reason I have added "per_pf" string.
>If you think this is not a good idea, I can move this params to driver-specific.