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

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Date:	Wed, 24 Jul 2013 00:10:19 -0700
From:	Joe Perches <joe@...ches.com>
To:	Wang Sheng-Hui <shhuiw@...il.com>
Cc:	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <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 Wed, 2013-07-24 at 14:53 +0800, Wang Sheng-Hui wrote:
> We have BOND_MODE_ROUNDROBIN pre-defined as 0, and it's the lowest mode number.
> Use it to check the arg lower bound instead of magic number 0 in bond_mode_name.
[]
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
[]
> @@ -273,7 +273,7 @@ const char *bond_mode_name(int mode)
>   		[BOND_MODE_ALB] = "adaptive load balancing",
>   	};
> 
> -	if (mode < 0 || mode > BOND_MODE_ALB)
> +	if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
>   		return "unknown";
> 
>   	return names[mode];

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";
	}


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