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

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Date:   Tue, 11 Sep 2018 13:51:26 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        davem@...emloft.net, michael.chan@...adcom.com,
        netdev@...r.kernel.org, Alexander Duyck <alexander.duyck@...il.com>
Subject: Re: [PATCH net-next 0/8] bnxt_en: devlink param updates

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.