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xfrm: Add support for network devices capable of removing the ESP trailer

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In conjunction with crypto offload [1], removing the ESP trailer by
hardware can potentially improve the performance by avoiding (1) a
cache miss incurred by reading the nexthdr field and (2) the necessity
to calculate the csum value of the trailer in order to keep skb->csum
valid.

This patch introduces the changes to the xfrm stack and merely serves
as an infrastructure. Subsequent patch to mlx5 driver will put this to
a good use.

[1] https://www.mail-archive.com/netdev@vger.kernel.org/msg175733.html

Signed-off-by: Yossi Kuperman <yossiku@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Yossi Kuperman
2017-08-30 11:30:39 +03:00
committed by Steffen Klassert
parent acfb98b996
commit 47ebcc0bb1
4 changed files with 89 additions and 38 deletions
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include/net/xfrm.h
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@@ -1019,6 +1019,7 @@ struct xfrm_offload {
#define CRYPTO_FALLBACK 8
#define XFRM_GSO_SEGMENT 16
#define XFRM_GRO 32
#define XFRM_ESP_NO_TRAILER 64
__u32 status;
#define CRYPTO_SUCCESS 1