netdev - Re: sit: Set SKB_GSO_SIT bit when performing GRO

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Date:	Thu, 16 Jul 2015 12:58:45 +0200
From:	Wolfgang Walter <linux@...m.de>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	netdev@...r.kernel.org, Tom Herbert <therbert@...gle.com>
Subject: Re: sit: Set SKB_GSO_SIT bit when performing GRO

Am Donnerstag, 16. Juli 2015, 08:23:50 schrieb Herbert Xu:
> On Wed, Jul 15, 2015 at 02:25:59PM +0200, Wolfgang Walter wrote:
> > Yes. Switching TSO off and leaving GRO on works, too.
> 
> OK, could you please try this patch?

Patch works here.

Thanks,

Wolfgang

> 
> ---8<---
> We need to set the SKB_GSO_SIT bit if we detect a 6-in-4 tunnel
> when doing GRO.  Otherwise we may throw a packet at TSO hardware
> that doesn't know what to do with it.
> 
> Fixes: 19424e052fb4 ("sit: Add gro callbacks to sit_offload")
> Reported-by: Wolfgang Walter <linux@...m.de>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> 
> diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
> index e893cd1..1252eac 100644
> --- a/net/ipv6/ip6_offload.c
> +++ b/net/ipv6/ip6_offload.c
> @@ -289,11 +289,21 @@ static struct packet_offload ipv6_packet_offload
> __read_mostly = { },
>  };
> 
> +static int sit_gro_complete(struct sk_buff *skb, int nhoff)
> +{
> +	int err = ipv6_gro_complete(skb, nhoff);
> +
> +	skb->encapsulation = 1;
> +	skb_shinfo(skb)->gso_type |= SKB_GSO_SIT;
> +
> +	return err;
> +}
> +
>  static const struct net_offload sit_offload = {
>  	.callbacks = {
>  		.gso_segment	= ipv6_gso_segment,
>  		.gro_receive	= ipv6_gro_receive,
> -		.gro_complete	= ipv6_gro_complete,
> +		.gro_complete	= sit_gro_complete,
>  	},
>  };

-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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