netdev - Re: [RFC PATCH 1/6] invisible network devices

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Message-ID: <20070129102814.6385ad2d@freekitty>
Date:	Mon, 29 Jan 2007 10:28:14 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Jiri Benc <jbenc@...e.cz>
Cc:	netdev@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	Stephen Hemminger <shemminger@...l.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC PATCH 1/6] invisible network devices

On Mon, 29 Jan 2007 18:48:06 +0100 (CET)
Jiri Benc <jbenc@...e.cz> wrote:

> The d80211 stack needs a network interface (called 'wmaster') used for
> communication with the hardware (it has 802.11 qdisc attached which perform
> MAC level QoS). This interface is not intended for users and it confuses
> them.
> 
> As a short time solution, this patch allows net_device to be registered as
> "invisible". This means it is not in the dev name hash list, its ifindex is
> -1 and protocols are not notified about its registration/unregistration.
> 
> Signed-off-by: Jiri Benc <jbenc@...e.cz>
>

Maybe code would be cleaner if you just could do:
	register_netdevice(mydev);

	cloak_netdevice(mydev);


And cloak_netdevice() just removed the network device from the 
name table.  I would rather keep it with a real ifindex and in the
device list, so that if the interface is miss used or the device
is referenced by other devices, we don't see unexpected surprises
like oops.

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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