netdev - Re: [RFT 3/4] Use mod_timer_noact to remove nf_conntrack

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Message-ID: <20090218110522.GA5408@ff.dom.local>
Date:	Wed, 18 Feb 2009 11:05:22 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>,
	Rick Jones <rick.jones2@...com>,
	Eric Dumazet <dada1@...mosbay.com>, netdev@...r.kernel.org,
	tglx@...utronix.de, netfilter-devel@...r.kernel.org,
	Martin Josefsson <gandalf@...g.westbo.se>
Subject: Re: [RFT 3/4] Use mod_timer_noact to remove nf_conntrack_lock

On 18-02-2009 06:19, Stephen Hemminger wrote:
> Now that we are using mod_timer_noact() for timer updates there's no need to

Hmm... so where exactly we are using this mod_timer_noact() now?

Jarek P.

> hold the global lock during the timer update since the actual timeout update
> is now protected by the timer locking.
> 
> Signed-off-by: Martin Josefsson <gandalf@...g.westbo.se>
> 
> ---
>  net/netfilter/nf_conntrack_core.c |    9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> --- a/net/netfilter/nf_conntrack_core.c	2009-02-17 10:55:33.370882059 -0800
> +++ b/net/netfilter/nf_conntrack_core.c	2009-02-17 13:48:25.080060712 -0800
> @@ -793,13 +793,12 @@ void __nf_ct_refresh_acct(struct nf_conn
>  	NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct);
>  	NF_CT_ASSERT(skb);
>  
> -	spin_lock_bh(&nf_conntrack_lock);
> -
>  	/* Only update if this is not a fixed timeout */
>  	if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status))
>  		goto acct;
>  
> -	/* If not in hash table, timer will not be active yet */
> +	/* If not in hash table, timer will not be active yet,
> +	   we are the only one able to see it. */
>  	if (!nf_ct_is_confirmed(ct)) {
>  		ct->timeout.expires = extra_jiffies;
>  		event = IPCT_REFRESH;
> @@ -821,16 +820,16 @@ acct:
>  	if (do_acct) {
>  		struct nf_conn_counter *acct;
>  
> +		spin_lock_bh(&nf_conntrack_lock);
>  		acct = nf_conn_acct_find(ct);
>  		if (acct) {
>  			acct[CTINFO2DIR(ctinfo)].packets++;
>  			acct[CTINFO2DIR(ctinfo)].bytes +=
>  				skb->len - skb_network_offset(skb);
>  		}
> +		spin_unlock_bh(&nf_conntrack_lock);
>  	}
>  
> -	spin_unlock_bh(&nf_conntrack_lock);
> -
>  	/* must be unlocked when calling event cache */
>  	if (event)
>  		nf_conntrack_event_cache(event, ct);
--
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