netdev - Re: [PATCH net-next v2 1/2] ip_gre: allow CSUM capable devices to handle packets

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Message-ID: <CANvJab2uOKaGG6SrJCjvhe39oPqQbLBuc44j_nkShz_NW8G98w@mail.gmail.com>
Date:	Tue, 19 Feb 2013 10:28:19 -0800
From:	pravin <pravin.shelar@...il.com>
To:	Dmitry Kravkov <dmitry@...adcom.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/2] ip_gre: allow CSUM capable devices to
 handle packets

On Mon, Feb 18, 2013 at 11:50 AM, Dmitry Kravkov <dmitry@...adcom.com> wrote:
> If device is not able to handle checksumming it will
> be handled in dev_xmit
>
> Signed-off-by: Dmitry Kravkov <dmitry@...adcom.com>
> ---
> Changes from v1: fixed email address
>
>  net/ipv4/ip_gre.c |    7 ++-----
>  1 files changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
> index a56f118..cdc31ac 100644
> --- a/net/ipv4/ip_gre.c
> +++ b/net/ipv4/ip_gre.c
> @@ -745,12 +745,9 @@ static struct sk_buff *handle_offloads(struct sk_buff *skb)
>                         goto error;
>                 skb_shinfo(skb)->gso_type |= SKB_GSO_GRE;
>                 return skb;
> -       } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
> -               err = skb_checksum_help(skb);
> -               if (unlikely(err))
> -                       goto error;
>         }
> -       skb->ip_summed = CHECKSUM_NONE;
> +       if (skb->ip_summed != CHECKSUM_PARTIAL)
> +               skb->ip_summed = CHECKSUM_NONE;
>
>         return skb;
>
> --
> 1.7.7.2
>
>

This patch breaks GRE tunnel with GRE_CSUM. since GRE_CSUM need
complete IP packet to checksum entire GRE payload.

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