esp: Add a software GRO codepath
This patch adds GRO ifrastructure and callbacks for ESP on
ipv4 and ipv6.
In case the GRO layer detects an ESP packet, the
esp{4,6}_gro_receive() function does a xfrm state lookup
and calls the xfrm input layer if it finds a matching state.
The packet will be decapsulated and reinjected it into layer 2.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 6e7baaf..e0878c3 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -360,6 +360,19 @@
If unsure, say Y.
+config INET_ESP_OFFLOAD
+ tristate "IP: ESP transformation offload"
+ depends on INET_ESP
+ select XFRM_OFFLOAD
+ default n
+ ---help---
+ Support for ESP transformation offload. This makes sense
+ only if this system really does IPsec and want to do it
+ with high throughput. A typical desktop system does not
+ need it, even if it does IPsec.
+
+ If unsure, say N.
+
config INET_IPCOMP
tristate "IP: IPComp transformation"
select INET_XFRM_TUNNEL