netdev - Re: [PATCHv2] Refactor update of IPv6 flow destination address for srcrt (RH) option

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Message-ID: <87mxve8lfw.fsf@small.ssi.corp>
Date:	Tue, 01 Jun 2010 23:58:11 +0200
From:	arno@...isbad.org (Arnaud Ebalard)
To:	Joe Perches <joe@...ches.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>, netdev@...r.kernel.org
Subject: Re: [PATCHv2] Refactor update of IPv6 flow destination address for srcrt (RH) option

Hi,

Joe Perches <joe@...ches.com> writes:

>> +static inline struct in6_addr *srcrt_dst_flow_update(struct in6_addr *final,
>> +						     struct in6_addr *fl6dst,
>> +						     const struct ipv6_txoptions *opt)
>> +{
>> +	if (opt && opt->srcrt) {
>> +		const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
>> +		ipv6_addr_copy(final, fl6dst);
>> +		ipv6_addr_copy(fl6dst, rt0->addr);
>> +		return final;
>> +	}
>> +	return NULL;
>> +}
>> +
>
> Should this be inline?  Maybe it'd be better moved to exthdrs.c

I thought it was small enough to keep it inline in ipv6.h but removing
the inline and moving it to exthdrs.c makes sense. 

> Perhaps this is clearer as something like:
>
> /**
>  * fl6_update_dst - update flow destination address
>  *
>  * @fl: flowlabel fl_dst to update
>  * @opt: struct ipv6_txoptions
>  * @orig: original fl_dst if modified
>  *
>  * Returns NULL if no txoptions or no srcrt, otherwise
>  * returns orig and initial value of fl->fl6_dst set in orig
>  */
> struct in6_addr *fl6_update_dst(struct ip6_flowlabel *fl,
> 				const struct ipv6_txoptions *opt,
> 				struct in6_addr *orig)
> {
> 	if (!opt || !opt->srcrt)
> 		return NULL;
>
> 	ipv6_addr_copy(orig, &fl->fl6_dst);
> 	ipv6_addr_copy(&fl->fl6_dst, ((struct rt0_hdr *)opt->srcrt)->addr);
> 	return orig;
> }

I'll send an updated new version tomorrow, i.e. in a few hours (with
s/ip6_flowlabel/flowi/).

Thanks for your feedback.

Cheers,

a+
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