Re: [PATCH v2 net-next] net/core: ensure features get disabled on new lower devs

[Laura Abbott]

On 11/13/2015 02:51 AM, Nikolay Aleksandrov wrote:
> On 11/13/2015 11:29 AM, Jiri Pirko wrote:
> > Fri, Nov 13, 2015 at 01:26:18AM CET, f.fainelli@xxxxxxxxx wrote:
> > > On 04/11/15 18:56, David Miller wrote:
> > > > > Fixes: fd867d51f889 ("net/core: generic support for disabling netdev features down stack")
> > > >   ...
> > > > > Reported-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
> > > > > Signed-off-by: Jarod Wilson <jarod@xxxxxxxxxx>
> > > > > ---
> > > > > v2: Based on suggestions from Alex, and with not changing err to ret, this
> > > > > patch actually becomes quite minimal and doesn't ugly up the code much.
> > > >
> > > > Applied, thanks.
> > >
> > > This causes some warnings to be displayed for DSA stacked devices:
> > >
> > > [    1.272297] brcm-sf2 f0b00000.ethernet_switch: Starfighter 2 top:
> > > 4.00, core: 2.00 base: 0xf0c80000, IRQs: 68, 69
> > > [    1.283181] libphy: dsa slave smi: probed
> > > [    1.344088] f0b403c0.mdio:05: Broadcom BCM7445 PHY revision: 0xd0,
> > > patch: 3
> > > [    1.658917] brcm-sf2 f0b00000.ethernet_switch gphy (uninitialized):
> > > attached PHY at address 5 [Broadcom BCM7445]
> > > [    1.669414] brcm-sf2 f0b00000.ethernet_switch gphy: set_features()
> > > failed (-1); wanted 0x0000000000004020, left 0x0000000000004820
> > > [    1.734202] brcm-sf2 f0b00000.ethernet_switch rgmii_1
> > > (uninitialized): attached PHY at address 0 [Generic PHY]
> > > [    1.744486] brcm-sf2 f0b00000.ethernet_switch rgmii_1: set_features()
> > > failed (-1); wanted 0x0000000000004020, left 0x0000000000004820
> > > [    1.809091] brcm-sf2 f0b00000.ethernet_switch rgmii_2
> > > (uninitialized): attached PHY at address 1 [Generic PHY]
> > > [    1.819364] brcm-sf2 f0b00000.ethernet_switch rgmii_2: set_features()
> > > failed (-1); wanted 0x0000000000004020, left 0x0000000000004820
> > > [    1.884090] brcm-sf2 f0b00000.ethernet_switch moca (uninitialized):
> > > attached PHY at address 2 [Generic PHY]
> > > [    1.894109] brcm-sf2 f0b00000.ethernet_switch moca: set_features()
> > > failed (-1); wanted 0x0000000000004020, left 0x0000000000004820
> > >
> > > DSA slave network devices are not associated with their master network
> > > device using the typical lower/upper netdev helpers.
> > >
> > > I do not have a good fix to come up with yet, but if you see something
> > > obvious with net/dsa/slave.c, feel free to send patches for testing, I
> > > can boot net-next on this platform.
> >
> > I'm having similar issues with bridge, with linus's git now:
> [snip]
>
> Hmm, I think it's because the bridge and dsa/slave don't have ndo_set_features()
> so err is left as -1 and thus an error is reported which isn't actually true.
> Before in this case the features would just get set, so could you please try
> the following patch ?
>
>
> 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,


The patch seems to be working for at least one person who reported the
problem in Fedora rawhide https://bugzilla.redhat.com/show_bug.cgi?id=1281674

Thanks,
Laura

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