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authorTom Herbert <therbert@google.com>2014-08-27 21:26:56 -0700
committerDavid S. Miller <davem@davemloft.net>2014-08-29 20:41:11 -0700
commit662880f4420340aad4f9a62a349c6c9d4faa1a5d (patch)
treed62876eeef140de3256a22f0632571dc00c9745c /net/core/dev.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 <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 26d296c2447c..a6077ef56345 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3962,13 +3962,6 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff
gro_list_prepare(napi, skb);
- if (skb->ip_summed == CHECKSUM_COMPLETE) {
- NAPI_GRO_CB(skb)->csum = skb->csum;
- NAPI_GRO_CB(skb)->csum_valid = 1;
- } else {
- NAPI_GRO_CB(skb)->csum_valid = 0;
- }
-
rcu_read_lock();
list_for_each_entry_rcu(ptype, head, list) {
if (ptype->type != type || !ptype->callbacks.gro_receive)
@@ -3980,7 +3973,22 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff
NAPI_GRO_CB(skb)->flush = 0;
NAPI_GRO_CB(skb)->free = 0;
NAPI_GRO_CB(skb)->udp_mark = 0;
- NAPI_GRO_CB(skb)->encapsulation = 0;
+
+ /* Setup for GRO checksum validation */
+ switch (skb->ip_summed) {
+ case CHECKSUM_COMPLETE:
+ NAPI_GRO_CB(skb)->csum = skb->csum;
+ NAPI_GRO_CB(skb)->csum_valid = 1;
+ NAPI_GRO_CB(skb)->csum_cnt = 0;
+ break;
+ case CHECKSUM_UNNECESSARY:
+ NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
+ NAPI_GRO_CB(skb)->csum_valid = 0;
+ break;
+ default:
+ NAPI_GRO_CB(skb)->csum_cnt = 0;
+ NAPI_GRO_CB(skb)->csum_valid = 0;
+ }
pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
break;