netdev - Re: [PATCH] net: add documentation for skb recycling

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Date:	Tue, 21 Oct 2008 05:17:32 +0200
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>,
	"Randy. Dunlap" <rdunlap@...otime.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: add documentation for skb recycling

On Mon, Oct 20, 2008 at 07:06:54PM -0700, Stephen Hemminger wrote:

> Include description of function from Lennert's original checkin.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
> ---
> As a matter of policy, any exported function should have docbook.
> 
> 
> --- a/net/core/skbuff.c	2008-10-20 16:10:44.000000000 -0700
> +++ b/net/core/skbuff.c	2008-10-20 16:16:01.000000000 -0700
> @@ -449,6 +449,18 @@ void kfree_skb(struct sk_buff *skb)
>  	__kfree_skb(skb);
>  }
>  
> +/**
> + * 	skb_recycle_check - check if skb can be reused for receive
> + *	@skb: buffer
> + * 	@skb_size: minimum receive buffer size
> + *
> + * 	Checks that the skb is not shared or cloned, and that it is
> + * 	linear and its head portion large enough (as determined by
> + * 	the driver) to be recycled as a receive buffer.  If these
> + * 	conditions are met, it does any necessary reference count
> + * 	dropping and cleans up the skbuff as if it just came from
> + * 	__alloc_skb().

How about tweaking this slightly and saying:

 * 	Checks that the skb passed in is not shared or cloned, and
 *	that it is linear and its head portion at least as large as
 *	skb_size so that it can be recycled as a receive buffer.
 * 	If these conditions are met, this function does any necessary
 *	reference count dropping and cleans up the skbuff as if it
 *	just came from __alloc_skb().

?
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