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xfrm: Fix the gc threshold value for ipv4

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The xfrm gc threshold value depends on ip_rt_max_size. This
value was set to INT_MAX with the routing cache removal patch,
so we start doing garbage collecting when we have INT_MAX/2
IPsec routes cached. Fix this by going back to the static
threshold of 1024 routes.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2012-11-13 08:52:24 +01:00
parent a66fe1653f
commit 703fb94ec5
3 changed files with 3 additions and 14 deletions
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2
include/net/xfrm.h
View File

@ -1351,7 +1351,7 @@ struct xfrm6_tunnel {
};
extern void xfrm_init(void);
extern void xfrm4_init(int rt_hash_size);
extern void xfrm4_init(void);
extern int xfrm_state_init(struct net *net);
extern void xfrm_state_fini(struct net *net);
extern void xfrm4_state_init(void);

2
net/ipv4/route.c
View File

@ -2597,7 +2597,7 @@ int __init ip_rt_init(void)
pr_err("Unable to create route proc files\n");
#ifdef CONFIG_XFRM
xfrm_init();
xfrm4_init(ip_rt_max_size);
xfrm4_init();
#endif
rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, NULL);

13
net/ipv4/xfrm4_policy.c
View File

@ -279,19 +279,8 @@ static void __exit xfrm4_policy_fini(void)
xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
}
void __init xfrm4_init(int rt_max_size)
void __init xfrm4_init(void)
{
/*
* Select a default value for the gc_thresh based on the main route
* table hash size. It seems to me the worst case scenario is when
* we have ipsec operating in transport mode, in which we create a
* dst_entry per socket. The xfrm gc algorithm starts trying to remove
* entries at gc_thresh, and prevents new allocations as 2*gc_thresh
* so lets set an initial xfrm gc_thresh value at the rt_max_size/2.
* That will let us store an ipsec connection per route table entry,
* and start cleaning when were 1/2 full
*/
xfrm4_dst_ops.gc_thresh = rt_max_size/2;
dst_entries_init(&xfrm4_dst_ops);
xfrm4_state_init();