netdev - Re: how to figure out which device a given IFB is connected to

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Message-ID: <20140915135508.5b346e22@urahara>
Date:	Mon, 15 Sep 2014 13:55:08 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Sebastian Moeller <moeller0@....de>
Cc:	Cong Wang <cwang@...pensource.com>, netdev <netdev@...r.kernel.org>
Subject: Re: how to figure out which device a given IFB is connected to

On Mon, 15 Sep 2014 21:06:31 +0200
Sebastian Moeller <moeller0@....de> wrote:

> Hi Mr. Wang,
> 
> Thank you for your help.
> 
> On Sep 15, 2014, at 18:08 , Cong Wang <cwang@...pensource.com> wrote:
> 
> > On Mon, Sep 15, 2014 at 7:37 AM, Sebastian Moeller <moeller0@....de> wrote:
> >> I am looking for a way of doing the reverse,i.e.  figuring out for a given IFB if it is “connected” to a real interface and, if yes, which interface. Basically, I want to recycle unused IFBs, but want to make sure that they really are unused…
> >> 
> > 
> > There is no way to figure that out.
> 
> 	That is rather unfortunate, so my only recourse is to get a list of all interfaces and query each whether it is attached to an fib and prune a list of IFBs so that only the unused ones remain (which is far from elegant ;) ).

It can be a many to one mapping.
There are cases where you want multiple incoming devices to all be QoS'd together.
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