netdev - Re: [PATCH v2] ethernet: call __skb_pull() in eth_type

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Message-Id: <20100503.125404.134122628.davem@davemloft.net>
Date:	Mon, 03 May 2010 12:54:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	xiaosuo@...il.com
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2] ethernet: call __skb_pull() in eth_type_trans()

From: Changli Gao <xiaosuo@...il.com>
Date: Mon,  3 May 2010 22:12:52 +0800

> @@ -162,7 +162,10 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
>  
>  	skb->dev = dev;
>  	skb_reset_mac_header(skb);
> -	skb_pull_inline(skb, ETH_HLEN);
> +	if (unlikely(skb->len < ETH_ZLEN))
> +		dev_warn(&dev->dev, "too small ethernet packet: %u bytes\n",
> +			 skb->len);
> +	__skb_pull(skb, ETH_HLEN);
>  	eth = eth_hdr(skb);

And now it's even more expensive than skb_pull_inline() :-)

Really, things are fine as-is.
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