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authorYossi Kuperman <yossiku@mellanox.com>2017-08-30 11:30:39 +0300
committerSteffen Klassert <steffen.klassert@secunet.com>2017-08-31 10:04:03 +0300
commit47ebcc0bb1d5eb7f1b1eeab675409ea7f67b4a5c (patch)
tree1718a09f7321053903a758a82b0101595113cad0 /include/net/xfrm.h
parentacfb98b99647aa7dc7c111db52d5f4199d2b641f (diff)
downloadlinux-47ebcc0bb1d5eb7f1b1eeab675409ea7f67b4a5c.tar.xz
xfrm: Add support for network devices capable of removing the ESP trailer
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>
Diffstat (limited to 'include/net/xfrm.h')
-rw-r--r--include/net/xfrm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 9c7b70cce6d6..f002a2c5e33c 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -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