netdev - Re: [PATCH] net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)

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Date:	Wed, 26 Jun 2013 00:30:51 +0200
From:	Arvid Brodin <arvid.brodin@...n.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Joe Perches <joe@...ches.com>,
	Javier Boticario <jboticario@...il.com>,
	"balferreira@...glemail.com" <balferreira@...glemail.com>
Subject: Re: [PATCH] net/hsr: Add support for the High-availability Seamless
 Redundancy protocol (HSRv0)

On 2013-06-25 02:07, Stephen Hemminger wrote:
> On Mon, 24 Jun 2013 09:44:01 -0700
> Arvid Brodin <arvid.brodin@...n.com> wrote:
> 
>> +
>> +
>> +static bool is_admin_up(struct net_device *dev)
>> +{
>> +       return dev && (dev->flags & IFF_UP);
>> +}
>> +
>> +static bool is_operstate_up(struct net_device *dev)
>> +{
>> +       return (dev && (dev->operstate == IF_OPER_UP));
>> +}
>> +
> 
> Isn't is_admin_up the same as netif_running()?

I don't think so (but I'm unsure). This is netif_running() (from include/linux/netdevice.h):

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

I'm not sure what this does. I don't think it's the same as checking whether the admin has
issued an UP command?


> And is_operstate_up the same as netif_oper_up()?

netif_oper_up() also returns true if the device state is IF_OPER_UNKNOWN. A device can
have that state without even having carrier, so that's not OK for the HSR driver.



-- 
Arvid Brodin | Consultant (Linux)
T: +46-8-56254286 | M: +46-70-9714286 | arvid.brodin@...n.com
XDIN AB | Knarrarnäsgatan 7 | SE-164 40 Kista | Sweden | xdin.com
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