netdev - Re: [PATCH net-next-2.6] ip_frag: Remove some atomic ops

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Date:	Mon, 14 Jun 2010 16:18:04 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Shan Wei <shanwei@...fujitsu.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] ip_frag: Remove some atomic ops

Le lundi 14 juin 2010 à 22:01 +0800, Shan Wei a écrit :
> Eric Dumazet wrote, at 06/14/2010 05:02 PM:
> > Instead of doing one atomic operation per frag, we can factorize them.
> > 
> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> 
> IPv6 netfilter has implemented owns queue to manage/reassemble defragments.
> So, you miss this one.
> 

Not exactly missed, its only a different thing :)

I prefer to separate if possible net patches (David) and netfilter ones
(Patrick), because of delay between git trees.

> [PATCH 1/2] netfilter: defrag: remove one redundant atomic ops
> 
> Instead of doing one atomic operation per frag, we can factorize them.
> Reported from Eric Dumazet.
> 
> Signed-off-by: Shan Wei <shanwei@...fujitsu.com>

Acked-by: Eric Dumazet <eric.dumazet@...il.com>

> ---
>  net/ipv6/netfilter/nf_conntrack_reasm.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
> index 6fb8901..bc5b86d 100644
> --- a/net/ipv6/netfilter/nf_conntrack_reasm.c
> +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
> @@ -442,7 +442,6 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
>  	skb_shinfo(head)->frag_list = head->next;
>  	skb_reset_transport_header(head);
>  	skb_push(head, head->data - skb_network_header(head));
> -	atomic_sub(head->truesize, &nf_init_frags.mem);
>  
>  	for (fp=head->next; fp; fp = fp->next) {
>  		head->data_len += fp->len;
> @@ -452,8 +451,8 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
>  		else if (head->ip_summed == CHECKSUM_COMPLETE)
>  			head->csum = csum_add(head->csum, fp->csum);
>  		head->truesize += fp->truesize;
> -		atomic_sub(fp->truesize, &nf_init_frags.mem);
>  	}
> +	atomic_sub(head->truesize, &nf_init_frags.mem);
>  
>  	head->next = NULL;
>  	head->dev = dev;


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