macvlan: use rx_handler_data pointer to store macvlan_port pointer V2
Register macvlan_port pointer as rx_handler data pointer. As macvlan_port is
removed from struct net_device, another netdev priv_flag is added to indicate
the device serves as a macvlan port.
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 87a3bf6..e096875 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -40,6 +40,11 @@
struct rcu_head rcu;
};
+#define macvlan_port_get_rcu(dev) \
+ ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
+#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
+#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
+
static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
const unsigned char *addr)
{
@@ -155,7 +160,7 @@
struct net_device *dev;
unsigned int len;
- port = rcu_dereference(skb->dev->macvlan_port);
+ port = macvlan_port_get_rcu(skb->dev);
if (is_multicast_ether_addr(eth->h_dest)) {
src = macvlan_hash_lookup(port, eth->h_source);
if (!src)
@@ -530,14 +535,12 @@
INIT_LIST_HEAD(&port->vlans);
for (i = 0; i < MACVLAN_HASH_SIZE; i++)
INIT_HLIST_HEAD(&port->vlan_hash[i]);
- rcu_assign_pointer(dev->macvlan_port, port);
- err = netdev_rx_handler_register(dev, macvlan_handle_frame, NULL);
- if (err) {
- rcu_assign_pointer(dev->macvlan_port, NULL);
+ err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
+ if (err)
kfree(port);
- }
+ dev->priv_flags |= IFF_MACVLAN_PORT;
return err;
}
@@ -551,10 +554,10 @@
static void macvlan_port_destroy(struct net_device *dev)
{
- struct macvlan_port *port = dev->macvlan_port;
+ struct macvlan_port *port = macvlan_port_get(dev);
+ dev->priv_flags &= ~IFF_MACVLAN_PORT;
netdev_rx_handler_unregister(dev);
- rcu_assign_pointer(dev->macvlan_port, NULL);
call_rcu(&port->rcu, macvlan_port_rcu_free);
}
@@ -633,12 +636,12 @@
if (!tb[IFLA_ADDRESS])
random_ether_addr(dev->dev_addr);
- if (lowerdev->macvlan_port == NULL) {
+ if (!macvlan_port_exists(lowerdev)) {
err = macvlan_port_create(lowerdev);
if (err < 0)
return err;
}
- port = lowerdev->macvlan_port;
+ port = macvlan_port_get(lowerdev);
vlan->lowerdev = lowerdev;
vlan->dev = dev;
@@ -748,10 +751,11 @@
struct macvlan_dev *vlan, *next;
struct macvlan_port *port;
- port = dev->macvlan_port;
- if (port == NULL)
+ if (!macvlan_port_exists(dev))
return NOTIFY_DONE;
+ port = macvlan_port_get(dev);
+
switch (event) {
case NETDEV_CHANGE:
list_for_each_entry(vlan, &port->vlans, list)