netdev - Re: [patch net-next-2.6 V3] net: convert bonding to use rx

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Date:	Sat, 19 Feb 2011 15:32:44 +0100
From:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>
To:	Jiri Pirko <jpirko@...hat.com>
CC:	Jay Vosburgh <fubar@...ibm.com>,
	David Miller <davem@...emloft.net>, kaber@...sh.net,
	eric.dumazet@...il.com, netdev@...r.kernel.org,
	shemminger@...ux-foundation.org, andy@...yhouse.net
Subject: Re: [patch net-next-2.6 V3] net: convert bonding to use rx_handler

Le 19/02/2011 14:46, Jiri Pirko a écrit :
> Sat, Feb 19, 2011 at 02:18:00PM CET, nicolas.2p.debian@...il.com wrote:

[snip]
>> Inside the loop, we should only do exact match delivery, for
>> &ptype_all and for&ptype_base[ntohs(type)&  PTYPE_HASH_MASK]:
>>
>>         list_for_each_entry_rcu(ptype,&ptype_all, list) {
>> -               if (!ptype->dev || ptype->dev == dev) {
>> +               if (ptype->dev == dev) {
>>                         if (pt_prev)
>>                                 ret = deliver_skb(skb, pt_prev, orig_dev);
>>                         pt_prev = ptype;
>>                 }
>>         }
>>
>>
>>         list_for_each_entry_rcu(ptype,
>>                         &ptype_base[ntohs(type)&  PTYPE_HASH_MASK], list) {
>>                 if (ptype->type == type&&
>> -                   (ptype->dev == null_or_dev || ptype->dev == skb->dev)) {
>> +                   (ptype->dev == skb->dev)) {
>>                         if (pt_prev)
>>                                 ret = deliver_skb(skb, pt_prev, orig_dev);
>>                         pt_prev = ptype;
>>                 }
>>         }
>>
>> After leaving the loop, we can do wilcard delivery, if skb is not NULL.
>>
>>         list_for_each_entry_rcu(ptype,&ptype_all, list) {
>> -               if (!ptype->dev || ptype->dev == dev) {
>> +               if (!ptype->dev) {
>>                         if (pt_prev)
>>                                 ret = deliver_skb(skb, pt_prev, orig_dev);
>>                         pt_prev = ptype;
>>                }
>>         }
>>
>>
>>         list_for_each_entry_rcu(ptype,
>>                         &ptype_base[ntohs(type)&  PTYPE_HASH_MASK], list) {
>> -               if (ptype->type == type&&
>> -                   (ptype->dev == null_or_dev || ptype->dev == skb->dev)) {
>> +		if (ptype->type == type&&  !ptype->dev) {
>>                         if (pt_prev)
>>                                 ret = deliver_skb(skb, pt_prev, orig_dev);
>>                         pt_prev = ptype;
>>                 }
>>         }
>>
>> This would reduce the number of tests inside the
>> list_for_each_entry_rcu() loops. And because we match only ptype->dev
>> == dev inside the loop and !ptype->dev outside the loop, this should
>> avoid duplicate delivery.
>
> Would you care to put this into patch so I can see the whole picture?
> Thanks.

I will try.

	Nicolas.
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