netdev - Re: [PATCH] net: increase skb->users instead of skb

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Message-ID: <1292485808.2603.78.camel@edumazet-laptop>
Date:	Thu, 16 Dec 2010 08:50:08 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>,
	Jiri Pirko <jpirko@...hat.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Junchang Wang <junchangwang@...il.com>,
	Xinan Tang <xinan.tang@...el.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: increase skb->users instead of skb_clone()

Le jeudi 16 décembre 2010 à 15:23 +0800, Changli Gao a écrit :
> On Thu, Dec 16, 2010 at 3:18 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >
> > You beat me, but I was thinking of a different way, adding a new
> > pt_prev->xmit_func(), handling all the details (no need for atomic ops
> > on skb users if packet is not delivered at all).
> >
> > By the way, your patch is not 100% safe/OK, because af_packet rcv()
> > handler writes on skb (skb_pull() and all)
> >
> 
> But af_packet_rcv() restores skbs at last.
> 
>         if (skb_head != skb->data && skb_shared(skb)) {
>                 skb->data = skb_head;
>                 skb->len = skb_len;
>         }
> 

Thats right, your patch seems fine, thanks !

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



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