netdev - Re: Fw: [Bug 194749] New: kernel bonding does not work in a network nameservice in versions above 3.10.0-229.20.1

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Message-ID: <CAM_iQpVm_WK9X+3Vsm0OrFCOd3Srn-s+xqe9fQtoT=30JZeVJQ@mail.gmail.com>
Date:   Thu, 2 Mar 2017 12:11:29 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        chenweilong@...wei.com, dan@...ter.net,
        Jiri Pirko <jiri@...lanox.com>
Subject: Re: Fw: [Bug 194749] New: kernel bonding does not work in a network
 nameservice in versions above 3.10.0-229.20.1

On Thu, Mar 2, 2017 at 10:32 AM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
>
>
> Begin forwarded message:
>
> Date: Wed, 01 Mar 2017 21:08:01 +0000
> From: bugzilla-daemon@...zilla.kernel.org
> To: stephen@...workplumber.org
> Subject: [Bug 194749] New: kernel bonding does not work in a network nameservice in versions above 3.10.0-229.20.1
>
>
> https://bugzilla.kernel.org/show_bug.cgi?id=194749
>
>             Bug ID: 194749
>            Summary: kernel bonding does not work in a network nameservice
>                     in versions above 3.10.0-229.20.1
>            Product: Networking
>            Version: 2.5
>     Kernel Version: > 3.10.0-229.20.1
>           Hardware: x86-64
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: blocking
>           Priority: P1
>          Component: Other
>           Assignee: stephen@...workplumber.org
>           Reporter: dan@...ter.net
>         Regression: No
>
> bond interface is being used in active/standby mode with two physical NICs
> inside a network nameservice to provide switchpath redundancy.
>
> netns is instantiated post-boot with the following:
>
> ip netns add vntp
> ip link set p4p1 netns vntp
> ip link set p4p2 netns vntp
> ip link set bond0 netns vntp
> ip netns exec vntp ip link set lo up
> ip netns exec vntp ip link set p4p1 up
> ip netns exec vntp ip link set p4p2 up
> ip netns exec vntp ip link set bond0 up
> ip netns exec vntp ifenslave bond0 p4p1 p4p2

This is due to the following commit:

commit f9399814927ad9bb995a6e109c2a5f9d8a848209
Author: Weilong Chen <chenweilong@...wei.com>
Date:   Wed Jan 22 17:16:30 2014 +0800

    bonding: Don't allow bond devices to change network namespaces.

    Like bridge, bonding as netdevice doesn't cross netns boundaries.

    Bonding ports and bonding itself live in same netns.

    Signed-off-by: Weilong Chen <chenweilong@...wei.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>


NETIF_F_NETNS_LOCAL was introduced for loopback device which
is created for each netns, it is not clear why we need to add it to bond
and bridge...