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xfrm: optimise to search the inexact policy list 

The policies are organized into list by priority ascent of policy,
so it is unnecessary to continue to loop the policy if the priority
of current looped police is larger than or equal priority which is
from the policy_bydst list.

This allows to match policy with ~0U priority in inexact list too.

Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Li RongQing 2015-05-14 11:16:59 +08:00 committed by Steffen Klassert
parent de2ad486cb
commit 8faf491e64
1 changed files with 8 additions and 3 deletions
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11
net/xfrm/xfrm_policy.c
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@ -1114,6 +1114,9 @@ static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
}
chain = &net->xfrm.policy_inexact[dir];
hlist_for_each_entry(pol, chain, bydst) {
if ((pol->priority >= priority) && ret)
break;
err = xfrm_policy_match(pol, fl, type, family, dir);
if (err) {
if (err == -ESRCH)
@ -1122,7 +1125,7 @@ static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
ret = ERR_PTR(err);
goto fail;
}
} else if (pol->priority < priority) {
} else {
ret = pol;
break;
}
@ -3203,9 +3206,11 @@ static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *
}
chain = &net->xfrm.policy_inexact[dir];
hlist_for_each_entry(pol, chain, bydst) {
if ((pol->priority >= priority) && ret)
break;
if (xfrm_migrate_selector_match(sel, &pol->selector) &&
pol->type == type &&
pol->priority < priority) {
pol->type == type) {
ret = pol;
break;
}