netdev - Re: [net] net: fix feature changes on devices without ndo_set

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Date:	Mon, 16 Nov 2015 10:01:14 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Nikolay Aleksandrov <razor@...ckwall.org>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	Jarod Wilson <jarod@...hat.com>, Jiri Pirko <jiri@...nulli.us>,
	Ido Schimmel <idosch@...lanox.com>,
	Sander Eikelenboom <linux@...elenboom.it>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [net] net: fix feature changes on devices without
 ndo_set_features

On 11/15/15 at 03:25pm, Dave Young wrote:
> On 11/13/15 at 02:54pm, Nikolay Aleksandrov wrote:
> > From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> > 
> > When __netdev_update_features() was updated to ensure some features are
> > disabled on new lower devices, an error was introduced for devices which
> > don't have the ndo_set_features() method set. Before we'll just set the
> > new features, but now we return an error and don't set them. Fix this by
> > returning the old behaviour and setting err to 0 when ndo_set_features
> > is not present.
> > 
> > Fixes: e7868a85e1b2 ("net/core: ensure features get disabled on new lower devs")
> > CC: Jarod Wilson <jarod@...hat.com>
> > CC: Jiri Pirko <jiri@...nulli.us>
> > CC: Ido Schimmel <idosch@...lanox.com>
> > CC: Sander Eikelenboom <linux@...elenboom.it>
> > CC: Andy Gospodarek <gospo@...ulusnetworks.com>
> > CC: Florian Fainelli <f.fainelli@...il.com>
> > Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
> > Reviewed-by: Jiri Pirko <jiri@...lanox.com>
> > Reviewed-by: Andy Gospodarek <gospo@...ulusnetworks.com>
> > Reviewed-by: Jarod Wilson <jarod@...hat.com>
> > Tested-by: Florian Fainelli <f.fainelli@...il.com>
> > ---
> > Sander please feel free to give your Tested-by.
> > 
> >  net/core/dev.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/net/core/dev.c b/net/core/dev.c
> > index ab9b8d0d115e..4a1d198dbbff 100644
> > --- a/net/core/dev.c
> > +++ b/net/core/dev.c
> > @@ -6426,6 +6426,8 @@ int __netdev_update_features(struct net_device *dev)
> >  
> >  	if (dev->netdev_ops->ndo_set_features)
> >  		err = dev->netdev_ops->ndo_set_features(dev, features);
> > +	else
> > +		err = 0;
> >  
> >  	if (unlikely(err < 0)) {
> >  		netdev_err(dev,
> 
> Tested-by: Dave Young <dyoung@...hat.com>
> 

BTW, more words about my testing. Latest mainline kernel breaks vpn connection.

Though vpnc connected successfully but ssh/web access failed. With this patch
applied it works again.

Thanks
Dave

> Thanks
> Dave
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