From 6261d983f226f0a6a8d4d32b57a032bc23a5ebb6 Mon Sep 17 00:00:00 2001 From: stephen hemminger Date: Mon, 5 Aug 2013 22:51:37 -0700 Subject: [PATCH] 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 Acked-by: Pravin B Shelar . Signed-off-by: David S. Miller --- include/net/ip_tunnels.h | 4 ++-- net/ipv4/ip_tunnel.c | 13 ++++++------- 2 files changed, 8 insertions(+), 9 deletions(-) diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h index 781b3cf86a2f..c6acd9f8f877 100644 --- a/include/net/ip_tunnels.h +++ b/include/net/ip_tunnels.h @@ -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 diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c index ca1cb2d5f6e2..9fdf8a6d95f3 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -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); -- 2.34.1