netdev - Re: [PATCH v2] act_mirred: don't clone skb when skb isn't shared

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Date:	Sat, 5 Jun 2010 22:58:43 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	hadi@...erus.ca
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v2] act_mirred: don't clone skb when skb isn't shared

On Sat, Jun 5, 2010 at 10:49 PM, jamal <hadi@...erus.ca> wrote:
> On Sat, 2010-06-05 at 20:39 +0800, Changli Gao wrote:
>
>> +     if ((action == TC_ACT_SHOT || action == TC_ACT_STOLEN ||
>
> I am not so sure about SHOT; the other two are fine.

It is unlikely that this function will be called with TC_ACT_SHOT. In
fact, this function has only one user act_mirred. Should we remove
this flag, or keep STOLEN flag only?

>
>> -     skb2 = skb_act_clone(skb, GFP_ATOMIC);
>> +     at = G_TC_AT(skb->tc_verd);
>
> Was there any need to move above line?

skb2 maybe skb, and its tc_verd maybe mangled in skb_act_clone(), so I
move it up.

>
>> +     skb2 = skb_act_clone(skb, GFP_ATOMIC, m->tcf_action);
>
>
>> -     skb2->dev = dev;
>
> Or this one?
>
>>       skb2->skb_iif = skb->dev->ifindex;
>> +     skb2->dev = dev;
>

the same reason as above. skb2 and skb maybe the same. If we don't
move lines, skb->dev maybe over written.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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