netdev - Re: [GIT] Networking

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Date:	Thu, 02 May 2013 13:39:47 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	dcbw@...hat.com
Cc:	torvalds@...ux-foundation.org, hayeswang@...ltek.com,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT] Networking

From: Dan Williams <dcbw@...hat.com>
Date: Thu, 02 May 2013 11:34:27 -0500

> On Wed, 2013-05-01 at 18:28 -0700, Linus Torvalds wrote:
>> On Wed, May 1, 2013 at 1:47 PM, David Miller <davem@...emloft.net> wrote:
>> >
>> > Highlights (1721 non-merge commits, this has to be a record of some
>> > sort):
>> 
>> Lowlight: it completely breaks my machine with r8169 ethernet.  In the
>> networkmanager applet, it claims no cable connection, which is a bit
>> odd, because (a) it works with an older kernel and (b) the kernel
>> messages actually say
>> 
>>   r8169 0000:01:00.0 eth0: link up
> 
> NM calls ETHTOOL_GLINK and if that returns success, NM expects the
> driver to support carrier detection.  NM then listens to netlink for
> device flags changes, and uses IFF_LOWER_UP to determine carrier on/off
> state.  NM does not use NETIF_F_VLAN_CHALLENGED or any of the other
> ETHTOOL_GFEATURES flags yet, but will in the future.
> 
> Is the link status accurately reflected by /sys/class/net/eth0/carrier ?

Something cares about the .../eth0/flags value because with the bit
ordering different for bits 10 and above things break.
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