Commit 92eb1d47 authored by Jesse Gross's avatar Jesse Gross

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: default avatarJustin Pettit <jpettit@nicira.com>
Signed-off-by: default avatarJesse Gross <jesse@nicira.com>
parent 39c7caeb
......@@ -114,6 +114,15 @@ static struct vport *netdev_create(const struct vport_parms *parms)
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)
......
......@@ -20,12 +20,15 @@
#define VPORT_NETDEV_H 1
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
#include "vport.h"
struct vport *ovs_netdev_get_vport(struct net_device *dev);
struct netdev_vport {
struct rcu_head rcu;
struct net_device *dev;
};
......
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