linux-kernel - Re: [PATCH 5.12 081/363] net: bridge: propagate error code and extack from br_mc_disabled

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Date:   Tue, 18 May 2021 14:12:42 +0000
From:   Rudi Heitbaum <rudi@...tbaum.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.12 081/363] net: bridge: propagate error code and
 extack from br_mc_disabled_update

On Tue, May 18, 2021 at 02:39:43PM +0200, Greg Kroah-Hartman wrote:
> On Tue, May 18, 2021 at 12:24:57PM +0000, Rudi Heitbaum wrote:
> > On Mon, May 17, 2021 at 03:59:07PM +0200, Greg Kroah-Hartman wrote:
> > > From: Florian Fainelli <f.fainelli@...il.com>
> > > 
> > > [ Upstream commit ae1ea84b33dab45c7b6c1754231ebda5959b504c ]
> > > 
> > > Some Ethernet switches might only be able to support disabling multicast
> > > snooping globally, which is an issue for example when several bridges
> > > span the same physical device and request contradictory settings.
> > > 
> > > Propagate the return value of br_mc_disabled_update() such that this
> > > limitation is transmitted correctly to user-space.
> > > 
> > > Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> > > Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> > > Signed-off-by: David S. Miller <davem@...emloft.net>
> > > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > > ---
> > >  net/bridge/br_multicast.c | 28 +++++++++++++++++++++-------
> > >  net/bridge/br_netlink.c   |  4 +++-
> > >  net/bridge/br_private.h   |  3 ++-
> > >  net/bridge/br_sysfs_br.c  |  8 +-------
> > >  4 files changed, 27 insertions(+), 16 deletions(-)
> > 
> > This patch results in docker failing to start, and a regression between
> > 5.12.4 and 5.12.5-rc1
> > 
> > A working dmesg output is like:
> > 
> > [   11.545255] device eth0 entered promiscuous mode
> > [   11.693848] process 'docker/tmp/qemu-check643160757/check' started with executable stack
> > [   17.233059] br-92020c7e3aea: port 1(veth17a0552) entered blocking state
> > [   17.233065] br-92020c7e3aea: port 1(veth17a0552) entered disabled state
> > [   17.233098] device veth17a0552 entered promiscuous mode
> > [   17.292839] docker0: port 2(veth9d227f5) entered blocking state
> > [   17.292848] docker0: port 2(veth9d227f5) entered disabled state
> > [   17.292946] device veth9d227f5 entered promiscuous mode
> > [   17.293070] docker0: port 2(veth9d227f5) entered blocking state
> > [   17.293075] docker0: port 2(veth9d227f5) entered forwarding state
> > 
> > with this patch "device veth17a0552 entered promiscuous mode" never
> > shows up.
> > 
> > the docker error itself is:
> > 
> > docker: Error response from daemon: failed to create endpoint
> > sleepy_dijkstra on network bridge: adding interface veth8cbd8f9 to
> > bridge docker0 failed: operation not supported.
> 
> Ick.
> 
> Does 5.13-rc1 also show this same problem?
> 
> And thanks for testing!
> 
> greg k-h

Hi Greg,

I can confirm that docker starts correctly with 5.13-rc1

# dmesg | head
[    0.000000] Linux version 5.13.0-rc1 (rudi@...f93d4a8a2) (x86_64-libreelec-linux-gnu-gcc-10.3.0 (GCC) 10.3.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP Tue May 18 14:00:41 UTC 2021
[    0.000000] Command line: BOOT_IMAGE=/KERNEL boot=LABEL=LIBREELEC disk=LABEL=STORAGE i915.enable_guc=2 quiet
...
[   11.214582] docker0: port 1(veth2b37ac4) entered blocking state
[   11.214589] docker0: port 1(veth2b37ac4) entered disabled state
[   11.214649] device veth2b37ac4 entered promiscuous mode
[   11.214752] docker0: port 1(veth2b37ac4) entered blocking state
[   11.214755] docker0: port 1(veth2b37ac4) entered forwarding state

Regards
Rudi