netdev - Re: [PATCH net-next] net: Cleanup skb cloning by adding SKB_FCLONE

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Date:	Thu, 02 Oct 2014 04:35:28 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vijay Subramanian <subramanian.vijay@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com
Subject: Re: [PATCH net-next] net: Cleanup skb cloning  by adding
 SKB_FCLONE_FREE

On Wed, 2014-10-01 at 23:33 -0700, Vijay Subramanian wrote:
> SKB_FCLONE_UNAVAILABLE has overloaded meaning depending on type of skb.
> 1: If skb is allocated from head_cache, it indicates fclone is not available.
> 2: If skb is a companion fclone skb (allocated from fclone_cache), it indicates
> it is available to be used.
> 
> To avoid confusion for case 2 above, this patch  replaces
> SKB_FCLONE_UNAVAILABLE with SKB_FCLONE_FREE where appropriate. For fclone
> companion skbs, this indicates it is free for use.
> 
> SKB_FCLONE_UNAVAILABLE will now simply indicate skb is from head_cache and
> cannot / will not have a companion fclone.
> 
> Signed-off-by: Vijay Subramanian <subramanian.vijay@...il.com>
> ---
>  include/linux/skbuff.h | 3 ++-
>  net/core/skbuff.c      | 8 ++++----
>  2 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 7c5036d..6c3fb9a 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -339,9 +339,10 @@ struct skb_shared_info {
>  
> 
>  enum {
> -	SKB_FCLONE_UNAVAILABLE,
> +	SKB_FCLONE_UNAVAILABLE,	/* skb has no fclone */
>  	SKB_FCLONE_ORIG,
>  	SKB_FCLONE_CLONE,
> +	SKB_FCLONE_FREE,	/* this fclone skb is available */
>  };
>  
Please comment all the states, now there is no ambiguity ?



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