netdev - Re: [patch net-next v3 16/17] bridge: add brport flags to dflt bridge

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Date:	Wed, 26 Nov 2014 10:48:10 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, nhorman@...driver.com,
	andy@...yhouse.net, dborkman@...hat.com, ogerlitz@...lanox.com,
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	bcrl@...ck.org
Subject: Re: [patch net-next v3 16/17] bridge: add brport flags to dflt
 bridge_getlink

On 11/26/14 at 10:25am, Jiri Pirko wrote:
> Tue, Nov 25, 2014 at 11:07:53PM CET, tgraf@...g.ch wrote:
> >> +static int brport_nla_put_flag(struct sk_buff *skb, u32 flags, u32 mask,
> >> +			       unsigned int attrnum, unsigned int flag)
> >> +{
> >> +	if (mask & flag)
> >> +		return nla_put_u8(skb, attrnum, !!(flags & flag));
> >
> >nla_put_flag()?
> 
> No, that is not the same. nla_put_flag works differently. The attr is
> either present or not. But in this case, attr is always present and has
> value of either 0 or 1.

So this reports the driver capabilities through this interface as
well.  Cool. Wasn't obvious to me before but that justifies the waste.
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