netdev - Re: Fw: [Bug 66691] New: iproute2: macvlan: Wrong root device shown if in different netns

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Message-ID: <CAGXE3d9hS4CBKTiKpn=_K3U6NPE+WzR4oFD1D3YtFb2NqzcxsA@mail.gmail.com>
Date:	Mon, 16 Dec 2013 11:47:14 +0100
From:	Helmut Schaa <helmut.schaa@...glemail.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: Fw: [Bug 66691] New: iproute2: macvlan: Wrong root device shown
 if in different netns

On Mon, Dec 16, 2013 at 11:41 AM, Pavel Emelyanov <xemul@...allels.com> wrote:
> On 12/16/2013 02:38 PM, Helmut Schaa wrote:
>> On Fri, Dec 6, 2013 at 9:05 PM, Stephen Hemminger
>> <stephen@...workplumber.org> wrote:
>>> This isn't a iproute2 bug, it is only reporting what the kernel tells it
>>
>> But iproute2 assumes that the ifindex is unique within all net
>> namespaces. This isn't true anymore
>> after commit aa79e66eee5d525e2fcbd2a5fcb87ae3dd4aa9e9 "net: Make
>> ifindex generation
>> per-net namespace".
>>
>> However, in order to do the right thing iproute2 would have to know
>> the ifindex of the
>> link device _and_ its associated netns.
>>
>> Not sure how to deal with that ...
>
> Helmut, what would you expect to see from "ip netns exec myns ip link"
> in case there were no device with ifindex 2 in the myns netns?

No idea, maybe something like "mac0@...nown" would be enough to express
that the link dev is not available within this netns.

My point was that it is confusing to show a clearly wrong link device.

Helmut
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