netdev - Re: [PATCH] bonding: use pre-defined macro in bond_mode

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Date:	Fri, 26 Jul 2013 13:56:10 -0700
From:	Joe Perches <joe@...ches.com>
To:	David Miller <davem@...emloft.net>
Cc:	shhuiw@...il.com, fubar@...ibm.com, andy@...yhouse.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH] bonding: use pre-defined macro in bond_mode_name
 instead of magic number 0

On Fri, 2013-07-26 at 13:53 -0700, David Miller wrote:
> From: Joe Perches <joe@...ches.com>
> Date: Wed, 24 Jul 2013 00:10:19 -0700
> 
> > Probably be simpler, less confusing, and more normal style
> > to use a switch case.
> > 
> >       switch (mode) {
> >       case BOND_MODE_ROUNDROBIN:
> >               return "load balancing (round-robin)";
> >       case BOND_MODE_ACTIVEBACKUP:
> >               return "fault-tolerance (active-backup)";
> >       case BOND_MODE_XOR:
> >               return "load balancing (xor)";
> >       case BOND_MODE_BROADCAST;
> >               return "fault-tolerance (broadcast)";
> >       case BOND_MODE_8023AD:
> >               return "IEEE 802.3ad Dynamic link aggregation";
> >       case BOND_MODE_TLB:
> >               return "transmit load balancing";
> >       case BOND_MODE_ALB:
> >               return "adaptive load balancing";
> >       default:
> >               return "unknown";
> >       }
> 
> I have to say that I do not prefer this approach.
> 
> I have a good idea what the compiler ends up outputting for the above,
> and the "indexed table of strings" approach is much less code.

It has the benefit of not breaking if ever the
BOND_MODE_<foo> #defines are ever non-consecutive.


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