From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laura Abbott Subject: Re: [PATCH v2 net-next] net/core: ensure features get disabled on new lower devs Date: Fri, 13 Nov 2015 14:31:44 -0800 Message-ID: <564664D0.9020007@redhat.com> References: <1446583017-19021-1-git-send-email-jarod@redhat.com> <1446610172-21420-1-git-send-email-jarod@redhat.com> <20151104.215632.964832400121049446.davem@davemloft.net> <56452E2A.9050501@gmail.com> <20151113102903.GB2143@nanopsycho.orion> <5645C0A5.2080506@cumulusnetworks.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: David Miller , jarod@redhat.com, linux-kernel@vger.kernel.org, edumazet@google.com, j.vosburgh@gmail.com, vfalico@gmail.com, gospo@cumulusnetworks.com, razor@blackwall.org, mkubecek@suse.cz, alexander.duyck@gmail.com, netdev@vger.kernel.org, Andrew Lunn , Vivien Didelot To: Nikolay Aleksandrov , Jiri Pirko , Florian Fainelli Return-path: In-Reply-To: <5645C0A5.2080506@cumulusnetworks.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org 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@gmail.com 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 >>>>> Signed-off-by: Jarod Wilson >>>>> --- >>>>> 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