netdev - Re: [patch net-next 0/4] net: allow to change carrier from userspace

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Date:	Wed, 12 Dec 2012 19:25:56 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	bhutchings@...arflare.com, mirqus@...il.com,
	greearb@...delatech.com, fbl@...hat.com
Subject: Re: [patch net-next 0/4] net: allow to change carrier from userspace

Wed, Dec 12, 2012 at 07:12:08PM CET, shemminger@...tta.com wrote:
>On Wed, 12 Dec 2012 19:10:17 +0100
>Jiri Pirko <jiri@...nulli.us> wrote:
>
>> ># ip li show dev dummy0
>> >12: dummy0: <NO-CARRIER,BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state DORMANT mode DORMANT   
>> 
>> if you mean this "NO-CARRIER"
>> it has no direct relation with netif_carrier_ok().
>
>It is the same value (IFF_RUNNING) that is visible from user space.

static inline bool netif_carrier_ok(const struct net_device *dev)
{
	        return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
}

So netif_carrier[ok/on/off] are working with on __LINK_STATE_NOCARRIER
bit. Not with IFF_RUNNING flag.
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