linux-kernel - Re: [PATCH 3/3] ipgre: capture inner headers during encapsulation

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Message-ID: <1352647110.5201.4.camel@lb-tlvb-dmitry.il.broadcom.com>
Date:	Sun, 11 Nov 2012 17:18:30 +0200
From:	"Dmitry Kravkov" <dmitry@...adcom.com>
To:	"Joseph Gasparakis" <joseph.gasparakis@...el.com>
cc:	davem@...emloft.net, shemminger@...tta.com, chrisw@...s-sol.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Peter P Waskiewicz Jr" <peter.p.waskiewicz.jr@...el.com>
Subject: Re: [PATCH 3/3] ipgre: capture inner headers during
 encapsulation

On Thu, 2012-11-08 at 18:18 -0800, Joseph Gasparakis wrote:
>  
>  	if (skb->ip_summed == CHECKSUM_PARTIAL &&
>  	    skb_checksum_help(skb))
> @@ -902,6 +903,17 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
>  			tunnel->err_count = 0;
>  	}
>  
> +	offset = skb->data - skb->head;
> +
> +	skb_reset_inner_mac_header(skb);
> +
> +	if (skb->network_header)
> +		skb_set_inner_network_header(skb, skb->network_header - offset);
> +
> +	if (skb->transport_header)
> +		skb_set_inner_transport_header(skb, skb->transport_header -
> +					       offset);
> +
>  	max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len;
>  
>  	if (skb_headroom(skb) < max_headroom || skb_shared(skb)||

How it will be useful if skb_checksum_help(skb) will calculate csum? And
leaves nothing to offload 



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