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authorTom Herbert <therbert@google.com>2014-09-01 02:12:43 +0400
committerDavid S. Miller <davem@davemloft.net>2014-09-02 08:36:28 +0400
commit2abb7cdc0dc84e99b76ef983a1ae1978922aa9b3 (patch)
tree9bf6029678d74ef6ad12e832d48d769caf88a4ed /net/ipv4/udp_offload.c
parentd96535a17dbbafd567961d14c08c0984ddda9c3c (diff)
downloadlinux-2abb7cdc0dc84e99b76ef983a1ae1978922aa9b3.tar.xz
udp: Add support for doing checksum unnecessary conversion
Add support for doing CHECKSUM_UNNECESSARY to CHECKSUM_COMPLETE conversion in UDP tunneling path. In the normal UDP path, we call skb_checksum_try_convert after locating the UDP socket. The check is that checksum conversion is enabled for the socket (new flag in UDP socket) and that checksum field is non-zero. In the UDP GRO path, we call skb_gro_checksum_try_convert after checksum is validated and checksum field is non-zero. Since this is already in GRO we assume that checksum conversion is always wanted. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp_offload.c')
-rw-r--r--net/ipv4/udp_offload.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index a6adff98382a..84e0e05c9c0e 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -290,16 +290,25 @@ static struct sk_buff **udp4_gro_receive(struct sk_buff **head,
{
struct udphdr *uh = udp_gro_udphdr(skb);
- /* Don't bother verifying checksum if we're going to flush anyway. */
- if (unlikely(!uh) ||
- (!NAPI_GRO_CB(skb)->flush &&
- skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
- inet_gro_compute_pseudo))) {
- NAPI_GRO_CB(skb)->flush = 1;
- return NULL;
- }
+ if (unlikely(!uh))
+ goto flush;
+ /* Don't bother verifying checksum if we're going to flush anyway. */
+ if (!NAPI_GRO_CB(skb)->flush)
+ goto skip;
+
+ if (skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
+ inet_gro_compute_pseudo))
+ goto flush;
+ else if (uh->check)
+ skb_gro_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
+ inet_gro_compute_pseudo);
+skip:
return udp_gro_receive(head, skb, uh);
+
+flush:
+ NAPI_GRO_CB(skb)->flush = 1;
+ return NULL;
}
int udp_gro_complete(struct sk_buff *skb, int nhoff)