netdev - [PATCH net v3 1/2] macvlan: introduce macvlan_dev_real

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Message-Id: <38a7b0ac80c26d6856444fedce47cec03efc5801.1384492269.git.mkubecek@suse.cz>
Date:	Fri, 15 Nov 2013 06:18:40 +0100 (CET)
From:	Michal Kubecek <mkubecek@...e.cz>
To:	netdev@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>,
	John Fastabend <john.r.fastabend@...el.com>,
	Vlad Yasevich <vyasevich@...il.com>
Subject: [PATCH net v3 1/2] macvlan: introduce macvlan_dev_real_dev() helper
 function

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@...e.cz>
---
 include/linux/if_macvlan.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/if_macvlan.h b/include/linux/if_macvlan.h
index c270285..84ba5ac 100644
--- a/include/linux/if_macvlan.h
+++ b/include/linux/if_macvlan.h
@@ -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 */
-- 
1.8.1.4

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