netdev - Re: [PATCH net-next-2.6] net: Introduce skb_orphan

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Message-ID: <1271921637.7895.4791.camel@edumazet-laptop>
Date:	Thu, 22 Apr 2010 09:33:57 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] net: Introduce skb_orphan_try()

Le jeudi 22 avril 2010 à 00:26 -0700, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Thu, 22 Apr 2010 09:24:05 +0200
> 
> > Hmm... are you sure we want to call destructor for each skb ?
> > 
> > Should'nt we do it before initial skb is split ?
> 
> Good idea, therefore you mean something like this?
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 3ba774b..f3c3885 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -1865,6 +1865,7 @@ static int dev_gso_segment(struct sk_buff *skb)
>  	int features = dev->features & ~(illegal_highdma(dev, skb) ?
>  					 NETIF_F_SG : 0);
>  
> +	skb_orphan_try(skb);
>  	segs = skb_gso_segment(skb, features);
>  
>  	/* Verifying header integrity only. */

Yes, it seems better.

What about the 

if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
	skb_dst_drop(skb);

This thing might also be moved before the split, since split probably
clone all dst ?


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