net: introduce netdev_change_features()

It will be needed by bonding and other drivers changing vlan_features
after ndo_init callback.

As a bonus, this includes kernel-doc for netdev_update_features().

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 00d650c748000a30abdc9cac51f42cc50219eed6..1d9696a9ee4dc58b9ab798f4bca3cfe03d3a9136 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2565,6 +2565,7 @@ u32 netdev_increment_features(u32 all, u32 one, u32 mask);
 u32 netdev_fix_features(struct net_device *dev, u32 features);
 int __netdev_update_features(struct net_device *dev);
 void netdev_update_features(struct net_device *dev);
+void netdev_change_features(struct net_device *dev);
 
 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
                                        struct net_device *dev);

diff --git a/net/core/dev.c b/net/core/dev.c
index 75898a32c03832a7ec876c1e3e4ac2232a660a41..ea23353e6251ae7b2f3053685242573803e9a054 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5289,6 +5289,14 @@ int __netdev_update_features(struct net_device *dev)
        return 1;
 }
 
+/**
+ *     netdev_update_features - recalculate device features
+ *     @dev: the device to check
+ *
+ *     Recalculate dev->features set and send notifications if it
+ *     has changed. Should be called after driver or hardware dependent
+ *     conditions might have changed that influence the features.
+ */
 void netdev_update_features(struct net_device *dev)
 {
        if (__netdev_update_features(dev))
@@ -5296,6 +5304,23 @@ void netdev_update_features(struct net_device *dev)
 }
 EXPORT_SYMBOL(netdev_update_features);
 
+/**
+ *     netdev_change_features - recalculate device features
+ *     @dev: the device to check
+ *
+ *     Recalculate dev->features set and send notifications even
+ *     if they have not changed. Should be called instead of
+ *     netdev_update_features() if also dev->vlan_features might
+ *     have changed to allow the changes to be propagated to stacked
+ *     VLAN devices.
+ */
+void netdev_change_features(struct net_device *dev)
+{
+       __netdev_update_features(dev);
+       netdev_features_change(dev);
+}
+EXPORT_SYMBOL(netdev_change_features);
+
 /**
  *     netif_stacked_transfer_operstate -      transfer operstate
  *     @rootdev: the root or lower level device to transfer state from