linux-kernel - Re: [RFC PATCH net-next 1/7] net: phy: introduce phy numbering and phy namespaces

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Date:   Mon, 11 Sep 2023 15:05:44 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Nicolò Veronese <nicveronese@...il.com>,
        thomas.petazzoni@...tlin.com,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [RFC PATCH net-next 1/7] net: phy: introduce phy numbering and
 phy namespaces

Hello Jakub,

On Fri, 8 Sep 2023 08:36:08 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> On Thu, 7 Sep 2023 14:19:04 +0200 Maxime Chevallier wrote:
> > > I think you can simplify this code quite a bit by using idr.
> > > idr_alloc_cyclic() looks like it will do the allocation you want,
> > > plus the IDR subsystem will store the pointer to the object (in
> > > this case the phy device) and allow you to look that up. That
> > > probably gets rid of quite a bit of code.
> > > 
> > > You will need to handle the locking around IDR however.    
> > 
> > Oh thanks for pointing this out. I had considered idr but I didn't spot
> > the _cyclic() helper, and I had ruled that out thinking it would re-use
> > ids directly after freeing them. I'll be more than happy to use that.  
> 
> Perhaps use xarray directly, I don't think we need the @base offset or
> quick access to @next which AFAICT is the only reason one would prefer
> IDR?

Oh indeed xa_alloc_cyclic looks to fit perfectly, thanks !

Maxime