netdev - Re: [net-next v3] bridge: trigger RTM_NEWLINK when interface is modified by bridge ioctl

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Date:   Thu, 21 Sep 2017 08:15:42 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Vincent Bernat <vincent@...nat.im>
Cc:     David Ahern <dsahern@...il.com>,
        David Miller <davem@...emloft.net>,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [net-next v3] bridge: trigger RTM_NEWLINK when interface is
 modified by bridge ioctl

On Thu, 21 Sep 2017 12:05:25 +0200
Vincent Bernat <vincent@...nat.im> wrote:

> Currently, there is a difference in netlink events received when an
> interface is modified through bridge ioctl() or through netlink. This
> patch generates additional events when an interface is added to or
> removed from a bridge via ioctl().
> 
> When adding then removing an interface from a bridge with netlink, we
> get:
> 
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master bridge0 state UNKNOWN group default
>     link/ether 9e:da:60:ee:cf:c8 brd ff:ff:ff:ff:ff:ff
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master bridge0 state UNKNOWN group default
>     link/ether 9e:da:60:ee:cf:c8 brd ff:ff:ff:ff:ff:ff
> 
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master bridge0 state UNKNOWN group default
>     link/ether 9e:da:60:ee:cf:c8 brd ff:ff:ff:ff:ff:ff
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> Deleted 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default
>     link/ether 9e:da:60:ee:cf:c8 brd ff:ff:ff:ff:ff:ff
> 
> When using ioctl():
> 
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master bridge0 state UNKNOWN group default
>     link/ether 9e:da:60:ee:cf:c8 brd ff:ff:ff:ff:ff:ff
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master bridge0 state UNKNOWN group default
>     link/ether 9e:da:60:ee:cf:c8 brd ff:ff:ff:ff:ff:ff
> 
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master bridge0 state UNKNOWN group default
>     link/ether 9e:da:60:ee:cf:c8 brd ff:ff:ff:ff:ff:ff
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> Deleted 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 master bridge0 state UNKNOWN
>     link/ether 9e:da:60:ee:cf:c8
> 5: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default
>     link/ether 9e:da:60:ee:cf:c8 brd ff:ff:ff:ff:ff:ff
> 
> Without this patch, the last netlink notification is not sent.
> 
> Signed-off-by: Vincent Bernat <vincent@...nat.im>

This makes sense, you should probably add a Fixes: tag to help maintainers
of long term stable kernels.

Reviewed-by: Stephen Hemminger <stephen@...workplumber.org>