netdev - Re: [net-next 02/11] i40e: Add ability to display VF stats along with PF core stats

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Date:   Wed, 23 Oct 2019 20:41:49 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     davem@...emloft.net, Arkadiusz Grubba <arkadiusz.grubba@...el.com>,
        netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: Re: [net-next 02/11] i40e: Add ability to display VF stats along
 with PF core stats

On Wed, 23 Oct 2019 11:24:17 -0700, Jeff Kirsher wrote:
> From: Arkadiusz Grubba <arkadiusz.grubba@...el.com>
> 
> This change introduces the ability to display extended (enhanced)
> statistics for PF interfaces.
> 
> The patch introduces new arrays defined for these
> extra stats (in i40e_ethtool.c file) and enhances/extends ethtool ops
> functions intended for dealing with PF stats (i.e.: i40e_get_stats_count(),
> i40e_get_ethtool_stats(), i40e_get_stat_strings() ).

This commit message doesn't explain _what_ stats your adding, and _why_.

From glancing at the code you're dumping 128 * 12 stats, which are
basic netdev stats per-VF. 

These are trivially exposed on representors in modern designs.

> There have also been introduced the new build flag named
> "I40E_PF_EXTRA_STATS_OFF" to exclude from the driver code all code snippets
> associated with these extra stats.

And this doesn't even exist in the patch.

> Signed-off-by: Arkadiusz Grubba <arkadiusz.grubba@...el.com>
> Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>