netdev - Re: [PATCH] ipv4/route.c: respect prefsrc for local routes

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Date:	Tue, 04 Jan 2011 09:38:35 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Joe Perches <joe@...ches.com>, Joel Sing <jsing@...gle.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4/route.c: respect prefsrc for local routes

Le mardi 04 janvier 2011 à 16:07 +0800, Changli Gao a écrit :
> On Tue, Jan 4, 2011 at 3:33 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > Le mardi 04 janvier 2011 à 08:24 +0100, Eric Dumazet a écrit :
> >
> >> Please use FIB_RES_PREFSRC(res)
> >>
> >
> > Hmm no, this is not applicable, but this could be shorter :
> >
> > fl.fl4_src = res.fi->fib_prefsrc ? : fl.fl4_dst;
> >
> >
> 
> I think Joe may object the use of "? :"
> 

Ternary operator is standard C idiom, used in networking stuff, for
example in FIB_RES_PREFSRC() ;)

This could be properly done using another macro in include/net/ip_fib.h
to centralize this ternary op in one point :

#define __FIB_RES_PREFSRC(res, default) ((res).fi->fib_prefsrc ? : default)
#define FIB_RES_PREFSRC(res) __FIB_RES_PREFSRC(res, default, __fib_res_prefsrc(&res))



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