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Message-ID: <1412249728.16704.76.camel@edumazet-glaptop2.roam.corp.google.com>
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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