netdev - RE: [PATCH v2 3/3] ipgre: capture inner headers during encapsulation

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Date:	Wed, 14 Nov 2012 12:32:39 +0000
From:	"Dmitry Kravkov" <dmitry@...adcom.com>
To:	"Joseph Gasparakis" <joseph.gasparakis@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"shemminger@...tta.com" <shemminger@...tta.com>,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>
cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Peter P Waskiewicz Jr" <peter.p.waskiewicz.jr@...el.com>
Subject: RE: [PATCH v2 3/3] ipgre: capture inner headers during
 encapsulation

> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
> On Behalf Of Joseph Gasparakis
> Sent: Monday, November 12, 2012 5:04 AM
> To: davem@...emloft.net; shemminger@...tta.com; chrisw@...s-sol.org
> Cc: Joseph Gasparakis; netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> Peter P Waskiewicz Jr
> Subject: [PATCH v2 3/3] ipgre: capture inner headers during encapsulation
> 
> Populating the inner header pointers of skb for ipgre
> This patch has been compile-tested only.
> 
> v2 Makes sure that checksumming does not take place if the offload flag is set in
> the skb's netdev features
> 
> Signed-off-by: Joseph Gasparakis <joseph.gasparakis@...el.com>
> Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
> ---
>  net/ipv4/ip_gre.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
> index 7240f8e..e35ed52 100644
> --- a/net/ipv4/ip_gre.c
> +++ b/net/ipv4/ip_gre.c
> @@ -766,8 +766,10 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff
> *skb, struct net_device *dev
>  	int    gre_hlen;
>  	__be32 dst;
>  	int    mtu;
> +	unsigned int offset;
> 
> -	if (skb->ip_summed == CHECKSUM_PARTIAL &&
> +	if (!(skb->dev->features & NETIF_F_HW_CSUM_ENC_BIT) &&

 You should test for NETIF_F_HW_CSUM_ENC and not for NETIF_F_HW_CSUM_ENC_BIT

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