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

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Date:	Tue, 25 Jun 2013 15:46:38 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Arvid Brodin <arvid.brodin@...n.com>
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 Wed, 26 Jun 2013 00:30:51 +0200
Arvid Brodin <arvid.brodin@...n.com> wrote:

> 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.
>

Then use netif_oper_up(dev) && netif_carrier_on(dev)

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