netdev - Re: [PATCH v3 net-next 1/2] ipv4: L3 hash-based multipath

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Message-ID: <560035BD.6090908@cumulusnetworks.com>
Date:	Mon, 21 Sep 2015 10:52:13 -0600
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Peter Nørlund <pch@...bogen.com>,
	netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH v3 net-next 1/2] ipv4: L3 hash-based multipath

On 9/15/15 2:29 PM, Peter Nørlund wrote:
> @@ -1094,8 +1142,15 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
>
>   	change_nexthops(fi) {
>   		fib_info_update_nh_saddr(net, nexthop_nh);
> +#ifdef CONFIG_IP_ROUTE_MULTIPATH
> +		fi->fib_weight += nexthop_nh->nh_weight;
> +#endif
>   	} endfor_nexthops(fi)
>
> +#ifdef CONFIG_IP_ROUTE_MULTIPATH
> +	fib_rebalance(fi);
> +#endif

The ifdefs everywhere make this harder to read. Just have a second 
definition above for fib_rebalance(fi) when CONFIG_IP_ROUTE_MULTIPATH is 
not defined.

Similarly an inlined macro of fi->fib_weight that compiles out if 
CONFIG_IP_ROUTE_MULTIPATH is not defined.

David
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