netdev - Re: [PATCH 0/4][RFC] netns: sysfs: add a netns suffix to net device sysfs entries

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Date:	Wed, 22 Oct 2008 14:24:17 -0700
From:	Greg KH <gregkh@...e.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Benjamin Thery <benjamin.thery@...l.net>,
	netdev <netdev@...r.kernel.org>,
	Dave Miller <davem@...emloft.net>,
	Al Viro <viro@....linux.org.uk>,
	Serge Hallyn <serue@...ibm.com>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	linux-kernel@...r.kernel.org, Tejun Heo <htejun@...il.com>,
	Denis Lunev <den@...nvz.org>,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH 0/4][RFC] netns: sysfs: add a netns suffix to net
	device sysfs entries

On Wed, Oct 22, 2008 at 02:08:26PM -0700, Eric W. Biederman wrote:
> Greg KH <gregkh@...e.de> writes:
> 
> > On Wed, Oct 22, 2008 at 05:21:44PM +0200, Benjamin Thery wrote:
> >> Network devices from sub-network namespaces appear in sysfs
> >> with a name that looks like this: device_name@...ns_id
> >> eg: lo@3, eth0@4e
> >
> > How does the default udev rules as shipped by most distros handle the
> > renaming of the network device if the MAC address is duplicated like it
> > will be for these eth devices?
> 
> The mac address is not duplicated.

Ah, ok, I really don't think I want to know more :)

> Further devices like eth0@4e are completely unusable to the udev
> rules in the initial network namespace because they can not talk
> to or affect them.

Oh, good point.

> As I read it Ben's ``solution'' puts entries in sysfs that are
> completely unusable to udev.

That's not a good thing to do, if udev can't see them, than HAL can't
see them, then the rest of userspace usually has no idea they are
present either.

thanks,

greg k-h
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