netdev - Re: [PATCH 1/1] Tell linkwatch about new interfaces

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Date:	Tue, 14 Jul 2009 14:17:21 -0300
From:	Sergio Luis <eeeesti@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	amluto@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] Tell linkwatch about new interfaces

Hello Dave,

On Sat, Apr 4, 2009 at 9:05 PM, David Miller<davem@...emloft.net> wrote:
> From: Andrew Lutomirski <amluto@...il.com>
> Date: Wed, 1 Apr 2009 11:40:06 -0400
>
>> When a network driver registers a new interface, linkwatch will not notice,
>> and hence not set the rfc2863 operstate, until netif_carrier_on gets called.
>> If the new interface has no carrier when it is connected, then a status of
>> "unknown" is reported to userspace, which confuses various tools
>> (NetworkManager, for example).
>>
>> This fires a linkwatch event for all new interfaces, so that operstate
>> gets set reasonably quickly.
>>
>> Signed-off-by: Andrew Lutomirski <amluto@...il.com>
>
> The default assumed state for a freshly registered network
> device is that the link is up.
>
> If that disagrees from reality, the driver should make the
> appropriate netif_carrier_off() call.
>
> I'm sure you'll find that the e1000 driver is not doing this
> and that is what causes the bug you are seeing.
> --

is this patch incorrect, though? with the linkwatch_fire_event() call,
the rfc2863 operstate will be set for everyone at device register
time.
in here I am having the interface operstate as 'unknown', but I do
ifconfig down and up or unplug/plug the cable again it will finally
set the correct rfc2863 operstate.

or should this be fixed on a per-driver basis, like it apparently was
in this case, for his e1000? (drivers/net/skge.c in here).

thanks,
sergio
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