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Date:   Tue, 18 May 2021 12:24:57 +0000
From:   Rudi Heitbaum <rudi@heitbaum.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Florian Fainelli <f.fainelli@gmail.com>,
        Vladimir Oltean <vladimir.oltean@nxp.com>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: Re: [PATCH 5.12 081/363] net: bridge: propagate error code and
 extack from br_mc_disabled_update
Message-ID: <20210518122449.GA65@ec3d6f83b95b>
References: <20210517140302.508966430@linuxfoundation.org>
 <20210517140305.339768334@linuxfoundation.org>
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On Mon, May 17, 2021 at 03:59:07PM +0200, Greg Kroah-Hartman wrote:
> From: Florian Fainelli <f.fainelli@gmail.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@gmail.com>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
> Signed-off-by: David S. Miller <davem@davemloft.net>
> Signed-off-by: Sasha Levin <sashal@kernel.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.

Regards
Rudi