[BRIDGE]: features change notification

Resend of earlier patch (no changes) from Catalin used to provide
device feature change notification.

Signed-off-by: Catalin BOIE <catab at umbrella.ro>
Acked-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -913,6 +913,7 @@ extern void		dev_mc_discard(struct net_device *dev);
 extern void		dev_set_promiscuity(struct net_device *dev, int inc);
 extern void		dev_set_allmulti(struct net_device *dev, int inc);
 extern void		netdev_state_change(struct net_device *dev);
+extern void		netdev_features_change(struct net_device *dev);
 /* Load a device via the kmod */
 extern void		dev_load(const char *name);
 extern void		dev_mcast_init(void);

include/linux/notifier.h

@@ -56,6 +56,7 @@ extern int notifier_call_chain(struct notifier_block **n, unsigned long val, voi
 #define NETDEV_CHANGEADDR	0x0008
 #define NETDEV_GOING_DOWN	0x0009
 #define NETDEV_CHANGENAME	0x000A
+#define NETDEV_FEAT_CHANGE	0x000B
 
 #define SYS_DOWN	0x0001	/* Notify of system down */
 #define SYS_RESTART	SYS_DOWN

net/core/dev.c

@@ -760,6 +760,18 @@ int dev_change_name(struct net_device *dev, char *newname)
 	return err;
 }
 
+/**
+ *	netdev_features_change - device changes fatures
+ *	@dev: device to cause notification
+ *
+ *	Called to indicate a device has changed features.
+ */
+void netdev_features_change(struct net_device *dev)
+{
+	notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
+}
+EXPORT_SYMBOL(netdev_features_change);
+
 /**
  *	netdev_state_change - device changes state
  *	@dev: device to cause notification

net/core/ethtool.c

@@ -682,6 +682,7 @@ int dev_ethtool(struct ifreq *ifr)
 	void __user *useraddr = ifr->ifr_data;
 	u32 ethcmd;
 	int rc;
+	int old_features;
 
 	/*
 	 * XXX: This can be pushed down into the ethtool_* handlers that
@@ -703,6 +704,8 @@ int dev_ethtool(struct ifreq *ifr)
 		if ((rc = dev->ethtool_ops->begin(dev)) < 0)
 			return rc;
 
+	old_features = dev->features;
+
 	switch (ethcmd) {
 	case ETHTOOL_GSET:
 		rc = ethtool_get_settings(dev, useraddr);
@@ -712,7 +715,6 @@ int dev_ethtool(struct ifreq *ifr)
 		break;
 	case ETHTOOL_GDRVINFO:
 		rc = ethtool_get_drvinfo(dev, useraddr);
-
 		break;
 	case ETHTOOL_GREGS:
 		rc = ethtool_get_regs(dev, useraddr);
@@ -801,6 +803,10 @@ int dev_ethtool(struct ifreq *ifr)
 
 	if(dev->ethtool_ops->complete)
 		dev->ethtool_ops->complete(dev);
+
+	if (old_features != dev->features)
+		netdev_features_change(dev);
+
 	return rc;
 
  ioctl: