netdev - Re: [PATCH 05/11] net: core: provide devm_register

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Date:   Thu, 7 May 2020 09:53:15 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Arnd Bergmann <arnd@...db.de>,
        Fabien Parent <fparent@...libre.com>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH 05/11] net: core: provide devm_register_netdev()

On Thu, 7 May 2020 11:25:01 +0200 Bartosz Golaszewski wrote:
> śr., 6 maj 2020 o 19:12 Jakub Kicinski <kuba@...nel.org> napisał(a):
> >
> > On Wed, 6 May 2020 08:39:47 +0200 Bartosz Golaszewski wrote:  
> > > wt., 5 maj 2020 o 19:31 Jakub Kicinski <kuba@...nel.org> napisał(a):  
> > > >
> > > > On Tue,  5 May 2020 16:02:25 +0200 Bartosz Golaszewski wrote:  
> > > > > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> > > > >
> > > > > Provide devm_register_netdev() - a device resource managed variant
> > > > > of register_netdev(). This new helper will only work for net_device
> > > > > structs that have a parent device assigned and are devres managed too.
> > > > >
> > > > > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>  
> > > >  
> > > > > diff --git a/net/core/dev.c b/net/core/dev.c
> > > > > index 522288177bbd..99db537c9468 100644
> > > > > --- a/net/core/dev.c
> > > > > +++ b/net/core/dev.c
> > > > > @@ -9519,6 +9519,54 @@ int register_netdev(struct net_device *dev)
> > > > >  }
> > > > >  EXPORT_SYMBOL(register_netdev);
> > > > >
> > > > > +struct netdevice_devres {
> > > > > +     struct net_device *ndev;
> > > > > +};  
> > > >
> > > > Is there really a need to define a structure if we only need a pointer?
> > > >  
> > >
> > > There is no need for that, but it really is more readable this way.
> > > Also: using a pointer directly doesn't save us any memory nor code
> > > here.  
> >
> > I don't care either way but devm_alloc_etherdev_mqs() and co. are using
> > the double pointer directly. Please make things consistent. Either do
> > the same, or define the structure in some header and convert other
> > helpers to also make use of it.  
> 
> In order to use devres_find() to check if struct net_device is managed
> in devm_register_netdev() I need to know the address of the release
> function used by devm_alloc_etherdev_mqs(). Do you mind if I move all
> networking devres routines (currently only devm_alloc_etherdev_mqs())
> into a separate .c file (e.g. under net/devres.c)?

To implement Edwin's suggestion? Makes sense, but I'm no expert, let's
also CC Heiner since he was asking about it last time.