bonding: switch bond_net_exit() to batch mode

cleanup_net() is competing with other rtnl users.

Batching bond_net_exit() factorizes all rtnl acquistions
to a single one, giving chance for cleanup_net()
to progress much faster, holding rtnl a bit longer.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jay Vosburgh <j.vosburgh@gmail.com>
Cc: Veaceslav Falico <vfalico@gmail.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 238b56d..617c2bf 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -6048,27 +6048,38 @@ static int __net_init bond_net_init(struct net *net)
        return 0;
 }
 
-static void __net_exit bond_net_exit(struct net *net)
+static void __net_exit bond_net_exit_batch(struct list_head *net_list)
 {
-       struct bond_net *bn = net_generic(net, bond_net_id);
-       struct bonding *bond, *tmp_bond;
+       struct bond_net *bn;
+       struct net *net;
        LIST_HEAD(list);
 
-       bond_destroy_sysfs(bn);
+       list_for_each_entry(net, net_list, exit_list) {
+               bn = net_generic(net, bond_net_id);
+               bond_destroy_sysfs(bn);
+       }
 
        /* Kill off any bonds created after unregistering bond rtnl ops */
        rtnl_lock();
-       list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
-               unregister_netdevice_queue(bond->dev, &list);
+       list_for_each_entry(net, net_list, exit_list) {
+               struct bonding *bond, *tmp_bond;
+
+               bn = net_generic(net, bond_net_id);
+               list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
+                       unregister_netdevice_queue(bond->dev, &list);
+       }
        unregister_netdevice_many(&list);
        rtnl_unlock();
 
-       bond_destroy_proc_dir(bn);
+       list_for_each_entry(net, net_list, exit_list) {
+               bn = net_generic(net, bond_net_id);
+               bond_destroy_proc_dir(bn);
+       }
 }
 
 static struct pernet_operations bond_net_ops = {
        .init = bond_net_init,
-       .exit = bond_net_exit,
+       .exit_batch = bond_net_exit_batch,
        .id   = &bond_net_id,
        .size = sizeof(struct bond_net),
 };

diff --git a/drivers/net/bonding/bond_procfs.c b/drivers/net/bonding/bond_procfs.c
index 46b150e..cfe37be 100644 (file)
--- a/drivers/net/bonding/bond_procfs.c
+++ b/drivers/net/bonding/bond_procfs.c
@@ -307,7 +307,6 @@ void __net_init bond_create_proc_dir(struct bond_net *bn)
 }
 
 /* Destroy the bonding directory under /proc/net, if empty.
- * Caller must hold rtnl_lock.
  */
 void __net_exit bond_destroy_proc_dir(struct bond_net *bn)
 {