path: root/net/ipv4/gre_offload.c
diff options
authorTom Herbert <>2014-08-27 21:26:56 -0700
committerDavid S. Miller <>2014-08-29 20:41:11 -0700
commit662880f4420340aad4f9a62a349c6c9d4faa1a5d (patch)
treed62876eeef140de3256a22f0632571dc00c9745c /net/ipv4/gre_offload.c
parent77cffe23c1f88835f6bd7b47bfa0c060c2969828 (diff)
net: Allow GRO to use and set levels of checksum unnecessary
Allow GRO path to "consume" checksums provided in CHECKSUM_UNNECESSARY and to report new checksums verfied for use in fallback to normal path. Change GRO checksum path to track csum_level using a csum_cnt field in NAPI_GRO_CB. On GRO initialization, if ip_summed is CHECKSUM_UNNECESSARY set NAPI_GRO_CB(skb)->csum_cnt to skb->csum_level + 1. For each checksum verified, decrement NAPI_GRO_CB(skb)->csum_cnt while its greater than zero. If a checksum is verfied and NAPI_GRO_CB(skb)->csum_cnt == 0, we have verified a deeper checksum than originally indicated in skbuf so increment csum_level (or initialize to CHECKSUM_UNNECESSARY if ip_summed is CHECKSUM_NONE or CHECKSUM_COMPLETE). Signed-off-by: Tom Herbert <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'net/ipv4/gre_offload.c')
1 files changed, 2 insertions, 5 deletions
diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index d1bd16937d93..a4d7965fb880 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -172,12 +172,9 @@ static struct sk_buff **gre_gro_receive(struct sk_buff **head,
/* Don't bother verifying checksum if we're going to flush anyway. */
- if (greh->flags & GRE_CSUM) {
- if (!NAPI_GRO_CB(skb)->flush &&
- skb_gro_checksum_simple_validate(skb))
+ if ((greh->flags & GRE_CSUM) && !NAPI_GRO_CB(skb)->flush &&
+ skb_gro_checksum_simple_validate(skb))
goto out_unlock;
- NAPI_GRO_CB(skb)->encapsulation++;
- }
flush = 0;