net: add netdev_for_each_upper_dev_rcu()

[karo-tx-linux.git] / include / linux / netdevice.h

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5ccf5b73c378c6f165965bdc1cbc4e5db03ffaa3..3ad49b833eabdd426de164a8bd56c5f271fe3a44 100644 (file)
--- 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,