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authorEric Dumazet <edumazet@google.com>2012-09-27 02:14:53 +0000
committerDavid S. Miller <davem@davemloft.net>2012-10-01 17:00:27 -0400
commit861b650101eb0c627d171eb18de81dddb93d395e (patch)
tree07c0b874476d6d82f8618c071402e742b1705b66 /net/ipv6
parent64c6d08e6490fb18cea09bb03686c149946bd818 (diff)
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tcp: gro: add checksuming helpers
skb with CHECKSUM_NONE cant currently be handled by GRO, and we notice this deep in GRO stack in tcp[46]_gro_receive() But there are cases where GRO can be a benefit, even with a lack of checksums. This preliminary work is needed to add GRO support to tunnels. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/tcp_ipv6.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index d6212d6bc8d..49c890386ce 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -763,6 +763,8 @@ static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
struct sk_buff *skb)
{
const struct ipv6hdr *iph = skb_gro_network_header(skb);
+ __wsum wsum;
+ __sum16 sum;
switch (skb->ip_summed) {
case CHECKSUM_COMPLETE:
@@ -771,11 +773,23 @@ static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
skb->ip_summed = CHECKSUM_UNNECESSARY;
break;
}
-
- /* fall through */
- case CHECKSUM_NONE:
+flush:
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
+
+ case CHECKSUM_NONE:
+ wsum = ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
+ skb_gro_len(skb),
+ IPPROTO_TCP, 0));
+ sum = csum_fold(skb_checksum(skb,
+ skb_gro_offset(skb),
+ skb_gro_len(skb),
+ wsum));
+ if (sum)
+ goto flush;
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ break;
}
return tcp_gro_receive(head, skb);