netdev - Re: [PATCH net] nfp: correct the output of `ethtool --show-fec <intf>`

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Date:   Tue, 31 May 2022 19:46:07 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yinjun Zhang <yinjun.zhang@...igine.com>
Cc:     Simon Horman <simon.horman@...igine.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        oss-drivers@...igine.com, Yu Xiao <yu.xiao@...igine.com>,
        Louis Peens <louis.peens@...igine.com>
Subject: Re: [PATCH net] nfp: correct the output of `ethtool --show-fec
 <intf>`

On Wed, 1 Jun 2022 09:48:25 +0800 Yinjun Zhang wrote:
> On Mon, May 30, 2022 at 09:32:32PM -0700, Jakub Kicinski wrote:
> > On Mon, 30 May 2022 10:48:42 +0200 Simon Horman wrote:  
> > > The output  of `Configured FEC encodings` should display user
> > > configured/requested value,  
> > 
> > That stands to reason, but when I checked what all drivers do 7 out 
> > of 10 upstream drivers at the time used it to report supported modes.  
> 
> It seems you're right. I agree it's OK that nfp driver keep the same with
> majority drivers' implementations.

FWIW this is what I found in my notes:

get:
 s - supported
 c - configured
set:
 1 - single mode
 m - multiple modes

      nfp | ionic | lio | cxgb4 | hns3 | i40e | ice | mlx5 | qede | sfc | bnxt
-----------------------------------------------------------------------------
get |  s  |   s   |  s  |   s   |  s   |  c?  |  s  |  c?  |  s   |  c? |
set |  1  |   1   |  1  |   m   |  m   |  1   |  1  |  m?  |  m   |  m  |

I don't know how accurate that was, hard to tell those things 
by looking only at the kernel driver.

> > At which point it may be better to change the text in ethtool user
> > space that try to change the meaning of the field..  
> 
> To adapt to both implementations, "Supported/Configured FEC encodings"
> would be a compromise I think.

Yup, it should help avoid bug reports. I don't have better ideas :(