Patchwork [net-next-2.6] net: Introduce skb_orphan_try()

From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 22 Apr 2010 09:47:03 +0200

> You could have one skb_orphan_try() call before the
> 
> if (netif_needs_gso(dev, skb)) {
> 
> and remove it from dev_gso_segment() ?

Yes, that's much more concise.  This should be ready to go:

net: Orphan and de-dst skbs earlier in xmit path.

This way GSO packets don't get handled differently.

With help from Eric Dumazet.

Signed-off-by: David S. Miller <davem@davemloft.net>

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Le jeudi 22 avril 2010 à 00:54 -0700, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@gmail.com>
> Date: Thu, 22 Apr 2010 09:47:03 +0200
> 
> > You could have one skb_orphan_try() call before the
> > 
> > if (netif_needs_gso(dev, skb)) {
> > 
> > and remove it from dev_gso_segment() ?
> 
> Yes, that's much more concise.  This should be ready to go:
> 
> net: Orphan and de-dst skbs earlier in xmit path.
> 
> This way GSO packets don't get handled differently.
> 
> With help from Eric Dumazet.
> 
> Signed-off-by: David S. Miller <davem@davemloft.net>
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 3ba774b..a4a7c36 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -1902,13 +1902,6 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
>  		if (!list_empty(&ptype_all))
>  			dev_queue_xmit_nit(skb, dev);
>  
> -		if (netif_needs_gso(dev, skb)) {
> -			if (unlikely(dev_gso_segment(skb)))
> -				goto out_kfree_skb;
> -			if (skb->next)
> -				goto gso;
> -		}
> -
>  		/*
>  		 * If device doesnt need skb->dst, release it right now while
>  		 * its hot in this cpu cache
> @@ -1917,6 +1910,14 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
>  			skb_dst_drop(skb);
>  
>  		skb_orphan_try(skb);
> +
> +		if (netif_needs_gso(dev, skb)) {
> +			if (unlikely(dev_gso_segment(skb)))
> +				goto out_kfree_skb;
> +			if (skb->next)
> +				goto gso;
> +		}
> +
>  		rc = ops->ndo_start_xmit(skb, dev);
>  		if (rc == NETDEV_TX_OK)
>  			txq_trans_update(txq);

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>

Thanks David !


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