netdev - [PATCH net-next v4 05/13] net: add netdev_for_each_upper_dev

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Message-Id: <1377725116-31126-6-git-send-email-vfalico@redhat.com>
Date:	Wed, 28 Aug 2013 23:25:08 +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>,
	Cong Wang <amwang@...hat.com>
Subject: [PATCH net-next v4 05/13] net: add netdev_for_each_upper_dev_rcu()

The new macro netdev_for_each_upper_dev_rcu(dev, upper, iter) iterates
through the dev->upper_dev_list starting from the first element, using
the netdev_upper_get_next_dev_rcu(dev, &iter).

Must be called under RCU read lock.

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>
CC: Cong Wang <amwang@...hat.com>
Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
---

Notes:
    v1: new patch
    v2: rename netdev_for_each_upper_dev{,_rcu} and use/export the renamed
        netdev_upper_get_next_dev_rcu().
    v3: no change
    v4: no change

 include/linux/netdevice.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5ccf5b7..3ad49b8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2768,6 +2768,16 @@ extern int		bpf_jit_enable;
 extern bool netdev_has_upper_dev(struct net_device *dev,
 				 struct net_device *upper_dev);
 extern bool netdev_has_any_upper_dev(struct net_device *dev);
+extern struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
+							struct list_head **iter);
+
+/* iterate through upper list, must be called under RCU read lock */
+#define netdev_for_each_upper_dev_rcu(dev, upper, iter) \
+	for (iter = &(dev)->upper_dev_list, \
+	     upper = netdev_upper_get_next_dev_rcu(dev, &(iter)); \
+	     upper; \
+	     upper = netdev_upper_get_next_dev_rcu(dev, &(iter)))
+
 extern struct net_device *netdev_master_upper_dev_get(struct net_device *dev);
 extern struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev);
 extern int netdev_upper_dev_link(struct net_device *dev,
-- 
1.8.4

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