netdev - Re: [PATCH] ip_gre: include route header_len in max

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Date:	Sat, 20 Mar 2010 20:37:36 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Timo Teras <timo.teras@....fi>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ip_gre: include route header_len in max_headroom
	calculation

On Sat, Mar 20, 2010 at 02:27:58PM +0200, Timo Teras wrote:
>
> diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
> index f47c9f7..f78402d 100644
> --- a/net/ipv4/ip_gre.c
> +++ b/net/ipv4/ip_gre.c
> @@ -810,11 +810,13 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
>  			tunnel->err_count = 0;
>  	}
>  
> -	max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen;
> +	max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->u.dst.header_len;
>  
>  	if (skb_headroom(skb) < max_headroom || skb_shared(skb)||
>  	    (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
>  		struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
> +		if (max_headroom > dev->needed_headroom)
> +			dev->needed_headroom = max_headroom;

Are you sure about this? LL_RESERVED_SPACE already includes
dev->needed_headroom so won't this get bigger each time?

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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