netdev - Re: [PATCH] netfilter: define NF_CT_EXT

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Date:	Mon, 15 Nov 2010 19:19:09 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netfilter: define NF_CT_EXT_* as needed

On Mon, Nov 15, 2010 at 7:13 PM, Patrick McHardy <kaber@...sh.net> wrote:
> On 15.11.2010 10:25, Changli Gao wrote:
>>  #ifdef CONFIG_NF_CONNTRACK_EVENTS
>> diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h
>> index 0772d29..1a9f96d 100644
>> --- a/include/net/netfilter/nf_conntrack_extend.h
>> +++ b/include/net/netfilter/nf_conntrack_extend.h
>> @@ -7,10 +7,16 @@
>>
>>  enum nf_ct_ext_id {
>>       NF_CT_EXT_HELPER,
>> +#if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE)
>>       NF_CT_EXT_NAT,
>> +#endif
>>       NF_CT_EXT_ACCT,
>> +#ifdef CONFIG_NF_CONNTRACK_EVENTS
>>       NF_CT_EXT_ECACHE,
>> +#endif
>> +#ifdef CONFIG_NF_CONNTRACK_ZONES
>>       NF_CT_EXT_ZONE,
>> +#endif
>>       NF_CT_EXT_NUM,
>
> What is the purpose of #ifdef'ing the extension IDs?
>

struct nf_ct_ext {
        struct rcu_head rcu;
        u8 offset[NF_CT_EXT_NUM];
        u8 len;
        char data[0];
};

Less IDs make nf_ct_ext smaller.
-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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