netdev - Re: [PATCH net] gre: Fix regression in gretap TSO support

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Date:	Wed, 29 Oct 2014 22:14:57 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	alexander.duyck@...il.com
Cc:	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	"H.K. Jerry Chu" <hkchu@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Alexander Duyck <alexander.h.duyck@...hat.com>,
	Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [PATCH net] gre: Fix regression in gretap TSO support

On Wed, Oct 29, 2014 at 8:26 PM,  <alexander.duyck@...il.com> wrote:
> From: Alexander Duyck <alexander.h.duyck@...hat.com>
>
> On recent kernels I found that TSO on gretap interfaces didn't work.  After
> bisecting it I found that commit b884b1a4 had introduced a regression in
> which the Ethernet header was being included in the GRE header length.
>
> This change corrects that by basing the GRE header length on the inner mac
> header in the case of GRE tunnels using transparent Ethernet bridging, and
> uses the network header for all other GRE tunnel types.
>
> Fixes: b884b1a4 ("gre_offload: simplify GRE header length calculation in gre_gso_segment()")
> Cc: Neal Cardwell <ncardwell@...gle.com>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: H.K. Jerry Chu <hkchu@...gle.com>
> Cc: Pravin B Shelar <pshelar@...ira.com>
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...hat.com>

Patch also fixed problem with ovs-gre.

Acked-by: Pravin B Shelar <pshelar@...ira.com>

Thanks.

> ---
>  net/ipv4/gre_offload.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
> index f6e345c..67a1f66 100644
> --- a/net/ipv4/gre_offload.c
> +++ b/net/ipv4/gre_offload.c
> @@ -47,7 +47,10 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
>
>         greh = (struct gre_base_hdr *)skb_transport_header(skb);
>
> -       ghl = skb_inner_network_header(skb) - skb_transport_header(skb);
> +       if (greh->protocol == htons(ETH_P_TEB))
> +               ghl = skb_inner_mac_header(skb) - skb_transport_header(skb);
> +       else
> +               ghl = skb_inner_network_header(skb) - skb_transport_header(skb);
>         if (unlikely(ghl < sizeof(*greh)))
>                 goto out;
>
>
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