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ipv6: gro: fix CHECKSUM_COMPLETE support 

When GRE support was added in linux-3.14, CHECKSUM_COMPLETE handling
broke on GRE+IPv6 because we did not update/use the appropriate csum :

GRO layer is supposed to use/update NAPI_GRO_CB(skb)->csum instead of
skb->csum

Tested using a GRE tunnel and IPv6 traffic. GRO aggregation now happens
at the first level (ethernet device) instead of being done in gre
tunnel. Native IPv6+TCP is still properly aggregated.

Fixes: bf5a755f5e ("net-gre-gro: Add GRE support to the GRO stack")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jerry Chu <hkchu@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-05-19 21:56:34 -07:00 committed by David S. Miller
parent bf63ac73b3
commit 4de462ab63
2 changed files with 2 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
net/ipv6/ip6_offload.c
View File

@ -196,7 +196,6 @@ static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
unsigned int off;
u16 flush = 1;
int proto;
__wsum csum;
off = skb_gro_offset(skb);
hlen = off + sizeof(*iph);
@ -264,13 +263,10 @@ static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
NAPI_GRO_CB(skb)->flush |= flush;
csum = skb->csum;
skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
skb_gro_postpull_rcsum(skb, iph, nlen);
pp = ops->callbacks.gro_receive(head, skb);
skb->csum = csum;
out_unlock:
rcu_read_unlock();

2
net/ipv6/tcpv6_offload.c
View File

@ -42,7 +42,7 @@ static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
if (NAPI_GRO_CB(skb)->flush)
goto skip_csum;
wsum = skb->csum;
wsum = NAPI_GRO_CB(skb)->csum;
switch (skb->ip_summed) {
case CHECKSUM_NONE: