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

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Message-ID: <504C9EFCA2D0054393414C9CB605C37F1C019A30@SJEXCHMB06.corp.ad.broadcom.com>
Date:	Tue, 19 Feb 2013 19:20:06 +0000
From:	"Dmitry Kravkov" <dmitry@...adcom.com>
To:	pravin <pravin.shelar@...il.com>
cc:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next v2 1/2] ip_gre: allow CSUM capable devices
 to handle packets


> -----Original Message-----
> From: pravin [mailto:pravin.shelar@...il.com]
> Sent: Tuesday, February 19, 2013 8:28 PM
> To: Dmitry Kravkov
> 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.

Testing for o_flags&GRE_CSUM does not look too hurt here, since it will be used in ipgre_tunnel_xmit() later on
This is the only problematic case, right?
 
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