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authorBenedict Wong <benedictwong@google.com>2018-07-19 20:50:44 +0300
committerSteffen Klassert <steffen.klassert@secunet.com>2018-07-20 11:14:41 +0300
commitbc56b33404599edc412b91933d74b36873e8ea25 (patch)
tree990df7b566ffa0a27de86bf1bac124a2b94f0101 /net/xfrm/xfrm_interface.c
parentfcb662deeb83bbc6df58b472a3bfe76981a8cc36 (diff)
downloadlinux-bc56b33404599edc412b91933d74b36873e8ea25.tar.xz
xfrm: Remove xfrmi interface ID from flowi
In order to remove performance impact of having the extra u32 in every single flowi, this change removes the flowi_xfrm struct, prefering to take the if_id as a method parameter where needed. In the inbound direction, if_id is only needed during the __xfrm_check_policy() function, and the if_id can be determined at that point based on the skb. As such, xfrmi_decode_session() is only called with the skb in __xfrm_check_policy(). In the outbound direction, the only place where if_id is needed is the xfrm_lookup() call in xfrmi_xmit2(). With this change, the if_id is directly passed into the xfrm_lookup_with_ifid() call. All existing callers can still call xfrm_lookup(), which uses a default if_id of 0. This change does not change any behavior of XFRMIs except for improving overall system performance via flowi size reduction. This change has been tested against the Android Kernel Networking Tests: https://android.googlesource.com/kernel/tests/+/master/net/test Signed-off-by: Benedict Wong <benedictwong@google.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm/xfrm_interface.c')
-rw-r--r--net/xfrm/xfrm_interface.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index 31cb1c7e3881..ccfe18d67e98 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -307,10 +307,8 @@ xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
if (!dst)
goto tx_err_link_failure;
- fl->flowi_xfrm.if_id = xi->p.if_id;
-
dst_hold(dst);
- dst = xfrm_lookup(xi->net, dst, fl, NULL, 0);
+ dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id);
if (IS_ERR(dst)) {
err = PTR_ERR(dst);
dst = NULL;