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macvlan: introduce macvlan_dev_real_dev() helper function

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Introduce helper function macvlan_dev_real_dev which returns the
underlying device of a macvlan device, similar to vlan_dev_real_dev()
for 802.1q VLAN devices.

v2: IFF_MACVLAN flag and equivalent of is_macvlan_dev() were
introduced in the meantime

v3: do BUG() if compiled without macvlan support

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Kubeček 2013-11-15 06:18:40 +01:00 committed by David S. Miller
parent f9de11a165
commit be9eac4827
1 changed files with 17 additions and 0 deletions
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17
include/linux/if_macvlan.h
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@ -119,4 +119,21 @@ extern int macvlan_link_register(struct rtnl_link_ops *ops);
extern netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
struct net_device *dev);
#if IS_ENABLED(CONFIG_MACVLAN)
static inline struct net_device *
macvlan_dev_real_dev(const struct net_device *dev)
{
struct macvlan_dev *macvlan = netdev_priv(dev);
return macvlan->lowerdev;
}
#else
static inline struct net_device *
macvlan_dev_real_dev(const struct net_device *dev)
{
BUG();
return NULL;
}
#endif
#endif /* _LINUX_IF_MACVLAN_H */