From 8b5be8561b804edf6b58fc27edbccf1d45863e08 Mon Sep 17 00:00:00 2001 From: Veaceslav Falico Date: Wed, 28 Aug 2013 23:25:08 +0200 Subject: [PATCH] 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" CC: Eric Dumazet CC: Jiri Pirko CC: Alexander Duyck CC: Cong Wang Signed-off-by: Veaceslav Falico Signed-off-by: David S. Miller --- include/linux/netdevice.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 5ccf5b73c378..3ad49b833eab 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, -- 2.39.5