netdev - Re: [PATCH net-next 4/6] octeontx2-vf: Ethtool support

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Message-ID: <20200311070549.GG4215@unreal>
Date:   Wed, 11 Mar 2020 09:05:49 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Sunil Kovvuri <sunil.kovvuri@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Linux Netdev List <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Tomasz Duszynski <tduszynski@...vell.com>,
        Sunil Goutham <sgoutham@...vell.com>
Subject: Re: [PATCH net-next 4/6] octeontx2-vf: Ethtool support

On Wed, Mar 11, 2020 at 12:09:45PM +0530, Sunil Kovvuri wrote:
> On Wed, Mar 11, 2020 at 12:51 AM Andrew Lunn <andrew@...n.ch> wrote:
> >
> > On Wed, Mar 11, 2020 at 12:17:23AM +0530, sunil.kovvuri@...il.com wrote:
> > > +int __weak otx2vf_open(struct net_device *netdev)
> > > +{
> > > +     return 0;
> > > +}
> > > +
> > > +int __weak otx2vf_stop(struct net_device *netdev)
> > > +{
> > > +     return 0;
> > > +}
> >
> > Hi Sunil
> >
> > weak symbols are very unusual in a driver. Why are they required?
> >
> > Thanks
> >         Andrew
>
> For ethtool configs which need interface reinitialization of interface
> we need to either call PF or VF open/close fn()s.
> If VF driver is not compiled in, then PF driver compilation will fail
> without these weak symbols.
> They are there just for compilation purpose, no other use.

It doesn't make sense, your PF driver should be changed to allow
compilation with those empty functions.

Thanks

>
> Thanks,
> Sunil.