netdev - Re: [net-2.6 PATCH 1/3] net: dcb: match dcb_app protocol field with 802.1Qaz spec

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Date:	Mon, 31 Jan 2011 20:41:04 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	john.r.fastabend@...el.com
Cc:	netdev@...r.kernel.org
Subject: Re: [net-2.6 PATCH 1/3] net: dcb: match dcb_app protocol field
 with 802.1Qaz spec

From: John Fastabend <john.r.fastabend@...el.com>
Date: Mon, 31 Jan 2011 14:00:49 -0800

> The dcb_app protocol field is a __u32 however the 802.1Qaz
> specification defines it as a 16 bit field. This patch brings
> the structure inline with the spec making it a __u16.
> 
> Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
 ...
> @@ -101,7 +101,7 @@ struct ieee_pfc {
>   */
>  struct dcb_app {
>  	__u8	selector;
> -	__u32	protocol;
> +	__u16	protocol;
>  	__u8	priority;
>  };
>  

If we're going to do this, please fix this wasteful structure
layout.  Put the "protocol" either first, or last, so that the
structure size is 4 bytes, rather than something like 8.
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