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

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Date:   Wed, 1 Jun 2022 09:48:25 +0800
From:   Yinjun Zhang <yinjun.zhang@...igine.com>
To:     Jakub Kicinski <kuba@...nel.org>
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 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.

> 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.

> 
> > rather than the NIC supported modes list.
> > 
> > Before this patch, the output is:
> >  # ethtool --show-fec <intf>
> >  FEC parameters for <intf>:
> >  Configured FEC encodings: Auto Off RS BaseR
> >  Active FEC encoding: None
> > 
> > With this patch, the corrected output is:
> >  # ethtool --show-fec <intf>
> >  FEC parameters for <intf>:
> >  Configured FEC encodings: Auto
> >  Active FEC encoding: None
>