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[BRIDGE]: set features based on enslaved devices

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Make features of the bridge pseudo-device be a subset of the underlying
devices.  Motivated by Xen and others who use bridging to do failover.

Signed-off-by: Catalin BOIE <catab at umrella.ro>
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2005-05-29 14:15:17 -07:00 committed by David S. Miller
parent 81e8157583
commit 81d35307dd
4 changed files with 40 additions and 8 deletions
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15
net/bridge/br_device.c
View File

@ -21,10 +21,7 @@
static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
{
struct net_bridge *br;
br = dev->priv;
struct net_bridge *br = netdev_priv(dev);
return &br->statistics;
}
@ -54,9 +51,11 @@ int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
static int br_dev_open(struct net_device *dev)
{
netif_start_queue(dev);
struct net_bridge *br = netdev_priv(dev);
br_stp_enable_bridge(dev->priv);
br_features_recompute(br);
netif_start_queue(dev);
br_stp_enable_bridge(br);
return 0;
}
@ -67,7 +66,7 @@ static void br_dev_set_multicast_list(struct net_device *dev)
static int br_dev_stop(struct net_device *dev)
{
br_stp_disable_bridge(dev->priv);
br_stp_disable_bridge(netdev_priv(dev));
netif_stop_queue(dev);
@ -76,7 +75,7 @@ static int br_dev_stop(struct net_device *dev)
static int br_change_mtu(struct net_device *dev, int new_mtu)
{
if ((new_mtu < 68) || new_mtu > br_min_mtu(dev->priv))
if (new_mtu < 68 || new_mtu > br_min_mtu(netdev_priv(dev)))
return -EINVAL;
dev->mtu = new_mtu;

23
net/bridge/br_if.c
View File

@ -314,6 +314,28 @@ int br_min_mtu(const struct net_bridge *br)
return mtu;
}
/*
* Recomputes features using slave's features
*/
void br_features_recompute(struct net_bridge *br)
{
struct net_bridge_port *p;
unsigned long features, checksum;
features = NETIF_F_SG | NETIF_F_FRAGLIST
| NETIF_F_HIGHDMA | NETIF_F_TSO;
checksum = NETIF_F_IP_CSUM; /* least commmon subset */
list_for_each_entry(p, &br->port_list, list) {
if (!(p->dev->features
& (NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM)))
checksum = 0;
features &= p->dev->features;
}
br->dev->features = features | checksum | NETIF_F_LLTX;
}
/* called with RTNL */
int br_add_if(struct net_bridge *br, struct net_device *dev)
{
@ -368,6 +390,7 @@ int br_del_if(struct net_bridge *br, struct net_device *dev)
spin_lock_bh(&br->lock);
br_stp_recalculate_bridge_id(br);
br_features_recompute(br);
spin_unlock_bh(&br->lock);
return 0;

9
net/bridge/br_notify.c
View File

@ -65,6 +65,15 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
}
break;
case NETDEV_FEAT_CHANGE:
if (br->dev->flags & IFF_UP)
br_features_recompute(br);
/* could do recursive feature change notification
* but who would care??
*/
break;
case NETDEV_DOWN:
if (br->dev->flags & IFF_UP)
br_stp_disable_port(p);

1
net/bridge/br_private.h
View File

@ -174,6 +174,7 @@ extern int br_add_if(struct net_bridge *br,
extern int br_del_if(struct net_bridge *br,
struct net_device *dev);
extern int br_min_mtu(const struct net_bridge *br);
extern void br_features_recompute(struct net_bridge *br);
/* br_input.c */
extern int br_handle_frame_finish(struct sk_buff *skb);