netdev - Re: [Patch net] macvlan: add NETIF_F_NETNS

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Message-ID: <CAHA+R7N2rxt5vyF+i8mi04dJaLk5bCgMAZOCexOLULLcQ-mT6w@mail.gmail.com>
Date:	Mon, 10 Feb 2014 18:25:51 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Cong Wang <xiyou.wangcong@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	Cong Wang <cwang@...pensource.com>
Subject: Re: [Patch net] macvlan: add NETIF_F_NETNS_LOCAL flag

On Mon, Feb 10, 2014 at 5:45 PM, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:
> On Mon, Feb 10, 2014 at 05:36:33PM -0800, Cong Wang wrote:
>> From: Cong Wang <cwang@...pensource.com>
>>
>> BZ: https://bugzilla.kernel.org/show_bug.cgi?id=66691
>>
>> There is no point to allow moving a macvlan device to
>> another namespace while the lower device is still in
>> this namespace. tunnels already set this flag.
>
> Can't we solve this somehow differently, like not showing anything at all
> etc.? I guess this is a feature some people use and haven't noticed yet.
>

I don't understand what you mean by "not showing anything at all".
I assume you mean mac1@xxx, not matter whether we show xxx
here, mac1 relies on xxx to function.

Please give a real use case rather than just guessing, I don't think
there is any valid case until we support moving multiple devices into
a netns atomically.
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