From 92eb1d477145b2e7780b5002e856f70b8c3d74da Mon Sep 17 00:00:00 2001 From: Jesse Gross Date: Wed, 28 Nov 2012 14:01:52 -0800 Subject: openvswitch: Use RCU callback when detaching netdevices. Currently, each time a device is detached from an OVS datapath we call synchronize RCU before freeing associated data structures. However, if a bridge is deleted (which detaches all ports) when many devices are connected then there can be a long delay. This switches to use call_rcu() to group the cost together. Reported-by: Justin Pettit Signed-off-by: Jesse Gross --- net/openvswitch/vport-netdev.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'net/openvswitch/vport-netdev.c') diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c index a903348..a9327e2 100644 --- a/net/openvswitch/vport-netdev.c +++ b/net/openvswitch/vport-netdev.c @@ -114,6 +114,15 @@ error: return ERR_PTR(err); } +static void free_port_rcu(struct rcu_head *rcu) +{ + struct netdev_vport *netdev_vport = container_of(rcu, + struct netdev_vport, rcu); + + dev_put(netdev_vport->dev); + ovs_vport_free(vport_from_priv(netdev_vport)); +} + static void netdev_destroy(struct vport *vport) { struct netdev_vport *netdev_vport = netdev_vport_priv(vport); @@ -122,10 +131,7 @@ static void netdev_destroy(struct vport *vport) netdev_rx_handler_unregister(netdev_vport->dev); dev_set_promiscuity(netdev_vport->dev, -1); - synchronize_rcu(); - - dev_put(netdev_vport->dev); - ovs_vport_free(vport); + call_rcu(&netdev_vport->rcu, free_port_rcu); } const char *ovs_netdev_get_name(const struct vport *vport) -- cgit v1.1