linux-kernel - Re: [net-next PATCH 1/2] net: ethtool: add define for link speed mode number

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Date:   Wed, 13 Dec 2023 20:23:57 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Kees Cook <keescook@...omium.org>,
        Piergiorgio Beruto <piergiorgio.beruto@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH 1/2] net: ethtool: add define for link speed
 mode number

On Wed, Dec 13, 2023 at 09:15:27PM +0100, Christian Marangi wrote:
> On Wed, Dec 13, 2023 at 08:10:42PM +0000, Russell King (Oracle) wrote:
> > NAK.
> > 
> > You *clearly* didn't look before you leaped.
> > 
> > On Wed, Dec 13, 2023 at 07:15:53PM +0100, Christian Marangi wrote:
> > > +enum ethtool_link_speeds {
> > > +	SPEED_10 = 0,
> > > +	SPEED_100,
> > > +	SPEED_1000,
> > ...
> > 
> > and from the context immediately below, included in your patch:
> > >  #define SPEED_10		10
> >            ^^^^^^^^
> > >  #define SPEED_100		100
> >            ^^^^^^^^^
> > >  #define SPEED_1000		1000
> >            ^^^^^^^^^^
> > 
> > Your enumerated values will be overridden by the preprocessor
> > definitions.
> > 
> > Moreover, SPEED_xxx is an already taken namespace and part of the UAPI,
> > and thus can _not_ be changed. Convention is that SPEED_x will be
> > defined as the numeric speed.
> >
> 
> Well yes that is the idea of having the enum to count them and then redefining
> them to the correct value. (wasn't trying to introduce new define for
> the speed and trying to assign incremental values)
> 
> Any idea how to handle this without the enum - redefine thing?
> 
> Was trying to find a more automated way than defining the raw number of
> the current modes. (but maybe this is not that bad? since on adding more
> modes, other values has to be changed so it would be just another value
> to document in the comment)

I think my comment on patch 2 gives some ideas! :D

-- 
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