netdev - Re: [PATCH v2 net-next 3/4] ipv6: Add gro functions to sit

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Date:	Fri, 16 Oct 2015 08:23:49 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesse Gross <jesse@...ira.com>, Jerry Chu <hkchu@...gle.com>
Cc:	Tom Herbert <tom@...bertland.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, kernel-team@...com,
	Wolfgang Walter <linux@...m.de>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH v2 net-next 3/4] ipv6: Add gro functions to sit_offloads

On Thu, 2015-08-06 at 17:15 -0700, Jesse Gross wrote:
> On Mon, Aug 3, 2015 at 10:11 AM, Tom Herbert <tom@...bertland.com> wrote:
> > For GRO to work with sit we need gro_receive and gro_complete populated
> > in the sit_offload structure.
> >
> > Signed-off-by: Tom Herbert <tom@...bertland.com>
> 
> You might want to checkout the recent history on this file unless
> there's something that's changed in the last couple of weeks:
> 
> commit fdbf5b097bbd9693a86c0b8bfdd071a9a2117cfc
> Author: Herbert Xu <herbert@...dor.apana.org.au>
> Date:   Mon Jul 20 17:55:38 2015 +0800
> 
>     Revert "sit: Add gro callbacks to sit_offload"
> 
>     This patch reverts 19424e052fb44da2f00d1a868cbb51f3e9f4bbb5 ("sit:
>     Add gro callbacks to sit_offload") because it generates packets
>     that cannot be handled even by our own GSO.
> 
>     Reported-by: Wolfgang Walter <linux@...m.de>
>     Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
>     Signed-off-by: David S. Miller <davem@...emloft.net>
> --


What about the following more complete patch ?

We properly set skb->encapsulation and inner network header as some NIC
drivers depend on it. Our GSO should also work properly I think.

Wolfgang, could you please test it ? (this is a patch on top of David
Miller net-next tree)

Both Google and Facebook are eager to get proper GRO/SIT support ;)

Thanks !

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 08b62047c67f..eeca943f12dc 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -264,6 +264,9 @@ static int ipv6_gro_complete(struct sk_buff *skb, int nhoff)
 	struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + nhoff);
 	int err = -ENOSYS;
 
+	if (skb->encapsulation)
+		skb_set_inner_network_header(skb, nhoff);
+
 	iph->payload_len = htons(skb->len - nhoff - sizeof(*iph));
 
 	rcu_read_lock();
@@ -280,6 +283,13 @@ out_unlock:
 	return err;
 }
 
+static int sit_gro_complete(struct sk_buff *skb, int nhoff)
+{
+	skb->encapsulation = 1;
+	skb_shinfo(skb)->gso_type |= SKB_GSO_SIT;
+	return ipv6_gro_complete(skb, nhoff);
+}
+
 static struct packet_offload ipv6_packet_offload __read_mostly = {
 	.type = cpu_to_be16(ETH_P_IPV6),
 	.callbacks = {
@@ -292,6 +302,8 @@ static struct packet_offload ipv6_packet_offload __read_mostly = {
 static const struct net_offload sit_offload = {
 	.callbacks = {
 		.gso_segment	= ipv6_gso_segment,
+		.gro_receive    = ipv6_gro_receive,
+		.gro_complete   = sit_gro_complete,
 	},
 };
 


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