netdev - [PATCH RFC net-next 18/21] net: add a function to get the next/prev private

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Date:	Mon,  2 Sep 2013 23:39:22 +0200
From:	Veaceslav Falico <vfalico@...hat.com>
To:	netdev@...r.kernel.org
Cc:	Veaceslav Falico <vfalico@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Alexander Duyck <alexander.h.duyck@...el.com>
Subject: [PATCH RFC net-next 18/21] net: add a function to get the next/prev private

The boolean flag specifies which direction to go.

CC: "David S. Miller" <davem@...emloft.net>
CC: Eric Dumazet <edumazet@...gle.com>
CC: Jiri Pirko <jiri@...nulli.us>
CC: Alexander Duyck <alexander.h.duyck@...el.com>
Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
---
 include/linux/netdevice.h |  2 ++
 net/core/dev.c            | 24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index bde2244..a112ccc 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2835,6 +2835,8 @@ extern void *netdev_lower_dev_get_private_rcu(struct net_device *dev,
 					      struct net_device *lower_dev);
 extern void *netdev_lower_dev_get_private(struct net_device *dev,
 					  struct net_device *lower_dev);
+extern void *netdev_lower_dev_get_next_private(struct net_device *dev,
+					       void *private, bool prev);
 extern int skb_checksum_help(struct sk_buff *skb);
 extern struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
 	netdev_features_t features, bool tx_path);
diff --git a/net/core/dev.c b/net/core/dev.c
index 6df11a0..c694059 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5163,6 +5163,30 @@ void *netdev_lower_dev_get_private(struct net_device *dev,
 }
 EXPORT_SYMBOL(netdev_lower_dev_get_private);
 
+extern void *netdev_lower_dev_get_next_private(struct net_device *dev,
+					       void *private, bool prev)
+{
+	struct netdev_adjacent *lower;
+
+	list_for_each_entry(lower, &dev->neighbour_dev_list.lower, list)
+		if (lower->private == private)
+			break;
+
+	if (&lower->list == &dev->neighbour_dev_list.lower)
+		return NULL;
+
+	lower = prev ? list_entry(lower->list.prev, struct netdev_adjacent, list) :
+		       list_entry(lower->list.next, struct netdev_adjacent, list);
+	if (&lower->list != &dev->neighbour_dev_list.lower)
+		return lower->private;
+
+	lower = prev ? list_entry(lower->list.prev, struct netdev_adjacent, list) :
+		       list_entry(lower->list.next, struct netdev_adjacent, list);
+
+	return lower->private;
+}
+EXPORT_SYMBOL(netdev_lower_dev_get_next_private);
+
 static void dev_change_rx_flags(struct net_device *dev, int flags)
 {
 	const struct net_device_ops *ops = dev->netdev_ops;
-- 
1.8.4

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