netdev - Re: [net-next 2/6] fm10k: reduce duplicate fm10k

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Date:   Tue, 08 May 2018 09:59:48 -0700
From:   Joe Perches <joe@...ches.com>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net
Cc:     Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com
Subject: Re: [net-next 2/6] fm10k: reduce duplicate fm10k_stat macro code

On Mon, 2018-05-07 at 07:45 -0700, Jeff Kirsher wrote:
> Share some of the code for setting up fm10k_stat macros by implementing
> an FM10K_STAT_FIELDS macro which we can use when setting up the type
> specific macros.
[]
> diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c b/drivers/net/ethernet/intel/fm10k/fm10k_ethtool.c
[]
> @@ -11,12 +11,16 @@ struct fm10k_stats {
>  	int stat_offset;
>  };o 
>  
> -#define FM10K_NETDEV_STAT(_net_stat) { \
> -	.stat_string = #_net_stat, \
> -	.sizeof_stat = FIELD_SIZEOF(struct net_device_stats, _net_stat), \
> -	.stat_offset = offsetof(struct net_device_stats, _net_stat) \
> +#define FM10K_STAT_FIELDS(_type, _name, _stat) { \
> +	.stat_string = _name, \
> +	.sizeof_stat = FIELD_SIZEOF(_type, _stat), \
> +	.stat_offset = offsetof(_type, _stat) \
>  }
>  
> +/* netdevice statistics */
> +#define FM10K_NETDEV_STAT(_net_stat) \
> +	FM10K_STAT_FIELDS(struct net_device_stats, #_net_stat, _net_stat)

trivia:

It's somewhat unusual to use # in a macro argument.
Perhaps this would be slightly easier to understand using __stringify

#define FM10K_NETDEV_STAT(_net_stat) \
	FM10K_STAT_FIELDS(struct net_device_stats, __stringify(_net_stat), _net_stat)