netdev - Re: [PATCH net-next] bridge: add notification over netlink when STP changes state

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Date:	Wed, 18 May 2011 08:39:48 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	David Miller <davem@...emloft.net>, bridge@...ux-foundation.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] bridge: add notification over netlink when STP
 changes state

On Wed, 18 May 2011 08:19:40 -0700
Ben Greear <greearb@...delatech.com> wrote:

> On 05/18/2011 08:17 AM, Stephen Hemminger wrote:
> > The first netlink code in the bridge module was to notify
> > user space implementations of Spanning Tree Protocol about
> > new ports. It did not handle the case of kernel mode STP
> > changing states which could be useful for monitoring.
> >
> > This patch causes RTM_NEWLINK message to occur on kernel
> > transitions. It does not send message if request was from user
> > space STP, since that would cause reflection and break existing
> > API.
> 
> So one app monitoring the system won't get updates if another
> app makes changes?
> 
> Ben

For now, yes. Just don't want to break any existing users
which is more important.

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