netdev - Re: [PATCH v2] net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)

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Date:	Mon, 8 Jul 2013 17:54:55 +0200
From:	Arvid Brodin <arvid.brodin@...n.com>
To:	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <shemminger@...tta.com>,
	<joe@...ches.com>, <jboticario@...il.com>,
	<balferreira@...glemail.com>
Subject: Re: [PATCH v2] net/hsr: Add support for the High-availability Seamless
 Redundancy protocol (HSRv0)

On 2013-07-02 01:48, Arvid Brodin wrote:
> On 2013-06-29 06:16, David Miller wrote:
>> From: Arvid Brodin <arvid.brodin@...n.com>
>> Date: Wed, 26 Jun 2013 17:16:11 +0200
>>
>>> +static int hsr_dev_open(struct net_device *dev)
>>> +{
>>> +    struct hsr_priv *hsr_priv;
>>> +
>>> +    hsr_priv = netdev_priv(dev);
>>> +
>>> +    if (hsr_priv->slave[0])
>>> +        dev_open(hsr_priv->slave[0]);
>>> +    if (hsr_priv->slave[1])
>>> +        dev_open(hsr_priv->slave[1]);
>>> +
>>> +    return 0;
>>> +}
>>
>> dev_open() can and does fail, you must thus check for error returns, undo any
>> necessary state, and propagate that error to callers of hsr_dev_open.
>>
>
> I'm not sure it's an error (from the HSR interface's point of view) if the slave(s)
> won't come up here. The calls to dev_open() can be seen more like a convenience
> than a necessity (I actually left them out to begin with). If none of the slaves
> could go up the HSR interface would end up as admin UP but with operstate
> IF_OPER_LOWERLAYERDOWN until any of the slaves went up.
>
> I see that the VLAN code, in its vlan_dev_open(), checks the underlying interface's
> IFF_UP flag and returns -ENETDOWN if it's not set. That might be an option here -
> but then one would have to set three interfaces up to get a working HSR interface,
> which is a bit tedious... Also, the HSR interface could end up in the state above
> anyway if both slaves went down after the HSR interface went up successfully.
>
> What about checking the return values and printing a warning if a slave dev_open()
> fails, but still return success for the HSR interface no matter what?
>


Is there anything else I can do to get this patch accepted? Anything that's missing
or done incorrectly that I need to fix?


-- 
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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