path: root/include
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authorAlexander Duyck <>2016-04-05 09:13:39 -0700
committerDavid S. Miller <>2016-04-07 16:56:33 -0400
commita0ca153f98db8cf25298565a09e11fe9d82846ad (patch)
tree5f7773cd6e2dbf30f3af97194a8b7d04b99fd1a0 /include
parent0a1a37b6d62e6864a77a82e925217c720f91f963 (diff)
GRE: Disable segmentation offloads w/ CSUM and we are encapsulated via FOU
This patch fixes an issue I found in which we were dropping frames if we had enabled checksums on GRE headers that were encapsulated by either FOU or GUE. Without this patch I was barely able to get 1 Gb/s of throughput. With this patch applied I am now at least getting around 6 Gb/s. The issue is due to the fact that with FOU or GUE applied we do not provide a transport offset pointing to the GRE header, nor do we offload it in software as the GRE header is completely skipped by GSO and treated like a VXLAN or GENEVE type header. As such we need to prevent the stack from generating it and also prevent GRE from generating it via any interface we create. Fixes: c3483384ee511 ("gro: Allow tunnel stacking in the case of FOU/GUE") Signed-off-by: Alexander Duyck <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'include')
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index cb0d5d09c2e4..8395308a2445 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2120,7 +2120,10 @@ struct napi_gro_cb {
/* Used in foo-over-udp, set in udp[46]_gro_receive */
u8 is_ipv6:1;
- /* 7 bit hole */
+ /* Used in GRE, set in fou/gue_gro_receive */
+ u8 is_fou:1;
+ /* 6 bit hole */
/* used to support CHECKSUM_COMPLETE for tunneling protocols */
__wsum csum;