linux-kernel - Re: [PATCH 1/5] ethtool: cosmetics: enforce const-ness in ethtool_cmd

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Date:	Sun, 17 Apr 2011 03:06:09 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Decotigny <decot@...gle.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	ilon Greenstein <eilong@...adcom.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/5] ethtool: cosmetics: enforce const-ness in
 ethtool_cmd_speed

On Sat, 2011-04-16 at 17:54 -0700, David Decotigny wrote:
> The 'ep' argument of ethtool_cmd_speed is not altered: advertise it in
> protoype. +Indentation fix. Also add comments to advise using the
> ethtool_cmd_speed API to get/set the link speed.
> 
> Signed-off-by: David Decotigny <decot@...gle.com>
> ---
>  include/linux/ethtool.h |   14 ++++++++++----
>  1 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
> index 9de3127..170439e 100644
> --- a/include/linux/ethtool.h
> +++ b/include/linux/ethtool.h
> @@ -24,7 +24,10 @@ struct ethtool_cmd {
>  	__u32	cmd;
>  	__u32	supported;	/* Features this interface supports */
>  	__u32	advertising;	/* Features this interface advertises */
> -	__u16	speed;		/* The forced speed, 10Mb, 100Mb, gigabit */
> +	__u16	speed;	        /* The forced speed (lower bits): see
> +				 * SPEED_ macros below. Please use
> +				 * ethtool_cmd_speed()/_set() to
> +				 * access it */
[...]

Don't encourage use of the SPEED_* macros.  The speed is just a value in
units of Mbit/s.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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