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ip_tunnel: embed hash list head 

The IP tunnel hash heads can be embedded in the per-net structure
since it is a fixed size. Reduce the size so that the total structure
fits in a page size. The original size was overly large, even NETDEV_HASHBITS
is only 8 bits!

Also, add some white space for readability.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Pravin B Shelar <pshelar@nicira.com>.
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2013-08-05 22:51:37 -07:00 committed by David S. Miller
parent 8a56d243ca
commit 6261d983f2
2 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/ip_tunnels.h
View File

@ -86,12 +86,12 @@ struct tnl_ptk_info {
#define PACKET_RCVD 0
#define PACKET_REJECT 1
#define IP_TNL_HASH_BITS 10
#define IP_TNL_HASH_BITS 7
#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
struct ip_tunnel_net {
struct hlist_head *tunnels;
struct net_device *fb_tunnel_dev;
struct hlist_head tunnels[IP_TNL_HASH_SIZE];
};
#ifdef CONFIG_INET

13
net/ipv4/ip_tunnel.c
View File

@ -838,15 +838,16 @@ int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
{
struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
struct ip_tunnel_parm parms;
unsigned int i;
itn->tunnels = kzalloc(IP_TNL_HASH_SIZE * sizeof(struct hlist_head), GFP_KERNEL);
if (!itn->tunnels)
return -ENOMEM;
for (i = 0; i < IP_TNL_HASH_SIZE; i++)
INIT_HLIST_HEAD(&itn->tunnels[i]);
if (!ops) {
itn->fb_tunnel_dev = NULL;
return 0;
}
memset(&parms, 0, sizeof(parms));
if (devname)
strlcpy(parms.name, devname, IFNAMSIZ);
@ -854,10 +855,9 @@ int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
rtnl_lock();
itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
rtnl_unlock();
if (IS_ERR(itn->fb_tunnel_dev)) {
kfree(itn->tunnels);
if (IS_ERR(itn->fb_tunnel_dev))
return PTR_ERR(itn->fb_tunnel_dev);
}
return 0;
}
@ -887,7 +887,6 @@ void ip_tunnel_delete_net(struct ip_tunnel_net *itn)
ip_tunnel_destroy(itn, &list);
unregister_netdevice_many(&list);
rtnl_unlock();
kfree(itn->tunnels);
}
EXPORT_SYMBOL_GPL(ip_tunnel_delete_net);