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05 April 2024, 19:05:47 UTC
Revision a0ca153f98db8cf25298565a09e11fe9d82846ad authored by Alexander Duyck on 05 April 2016, 16:13:39 UTC, committed by David S. Miller on 07 April 2016, 20:56:33 UTC 
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 <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 0a1a37b
History
Tip revision: a0ca153f98db8cf25298565a09e11fe9d82846ad authored by Alexander Duyck on 05 April 2016, 16:13:39 UTC
GRE: Disable segmentation offloads w/ CSUM and we are encapsulated via FOU
Tip revision: a0ca153
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