linux-kernel - Re: [PATCH net-next] udp: Neaten and reduce size of compute

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Date:	Mon, 01 Dec 2014 19:09:20 -0800
From:	Joe Perches <joe@...ches.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] udp: Neaten and reduce size of compute_score
 functions

On Mon, 2014-12-01 at 18:59 -0800, Eric Dumazet wrote:
> On Mon, 2014-12-01 at 17:39 -0800, Joe Perches wrote:
> > The compute_score functions are a bit difficult to read.
> > 
> > Neaten them a bit to reduce object sizes and make them a
> > bit more intelligible.
> > 
> > Return early to avoid indentation and avoid unnecessary
> > initializations.
[]
> > +	if (!(net_eq(sock_net(sk), net) &&
> > +	      udp_sk(sk)->udp_port_hash == hnum &&
> > +	      !ipv6_only_sock(sk)))
> > +		return -1
> 
> Or even better :
> 
> 
> 	if (!net_eq(sock_net(sk), net) ||
> 	    udp_sk(sk)->udp_port_hash != hnum ||
> 	    ipv6_only_sock(sk))
> 		return -1;

Hi Eric.

Yeah, I thought about it but thought it
simpler to not change the logic.

Either way is fine with me.

David?

btw: the same thing can be done for the v6 block too:

+       if (!(net_eq(sock_net(sk), net) && !ipv6_only_sock(sk)))
+               return -1;
 
-               if (inet->inet_rcv_saddr != daddr)
+       inet = inet_sk(sk);
+
+       if (inet->inet_rcv_saddr != daddr)
+               return -1;
+       if (inet->inet_num != hnum)
+               return -1;

to:

	if (!net_eq(sock_net(sk, net) ||
	    ipv6_only_sock(sk))
		return -1;

	inet = inet_sk(sk);

	if (inet->inet_rcv_saddr != daddr ||
	    inet->inet_num != hnum)
		return -1;


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