[PATCH 5/6] ipip: Optimize multiple unregistration
From: Eric Dumazet <hidden>
Date: 2009-10-27 17:07:12
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
Speedup module unloading by factorizing synchronize_rcu() calls Signed-off-by: Eric Dumazet <redacted> --- net/ipv4/ipip.c | 17 +++++++++++------ 1 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 3bd6998..a2ca53d 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c@@ -754,16 +754,19 @@ static struct xfrm_tunnel ipip_handler = { static const char banner[] __initconst = KERN_INFO "IPv4 over IPv4 tunneling driver\n"; -static void ipip_destroy_tunnels(struct ipip_net *ipn) +static void ipip_destroy_tunnels(struct ipip_net *ipn, struct list_head *head) { int prio; for (prio = 1; prio < 4; prio++) { int h; for (h = 0; h < HASH_SIZE; h++) { - struct ip_tunnel *t; - while ((t = ipn->tunnels[prio][h]) != NULL) - unregister_netdevice(t->dev); + struct ip_tunnel *t = ipn->tunnels[prio][h]; + + while (t != NULL) { + unregister_netdevice_queue(t->dev, head); + t = t->next; + } } } }
@@ -816,11 +819,13 @@ err_alloc: static void ipip_exit_net(struct net *net) { struct ipip_net *ipn; + LIST_HEAD(list); ipn = net_generic(net, ipip_net_id); rtnl_lock(); - ipip_destroy_tunnels(ipn); - unregister_netdevice(ipn->fb_tunnel_dev); + ipip_destroy_tunnels(ipn, &list); + unregister_netdevice_queue(ipn->fb_tunnel_dev, &list); + unregister_netdevice_many(&list); rtnl_unlock(); kfree(ipn); }