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-rw-r--r--include/linux/rtnetlink.h30
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 58d44491880f..d42f274418b8 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -6,6 +6,7 @@
#include <linux/if_link.h>
#include <linux/if_addr.h>
#include <linux/neighbour.h>
+#include <linux/netdevice.h>
/* rtnetlink families. Values up to 127 are reserved for real address
* families, values above 128 may be used arbitrarily.
@@ -749,6 +750,35 @@ extern int rtnl_is_locked(void);
extern int lockdep_rtnl_is_held(void);
#endif /* #ifdef CONFIG_PROVE_LOCKING */
+/**
+ * rcu_dereference_rtnl - rcu_dereference with debug checking
+ * @p: The pointer to read, prior to dereferencing
+ *
+ * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
+ * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
+ */
+#define rcu_dereference_rtnl(p) \
+ rcu_dereference_check(p, rcu_read_lock_held() || \
+ lockdep_rtnl_is_held())
+
+/**
+ * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
+ * @p: The pointer to read, prior to dereferencing
+ *
+ * Return the value of the specified RCU-protected pointer, but omit
+ * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
+ * caller holds RTNL.
+ */
+#define rtnl_dereference(p) \
+ rcu_dereference_protected(p, lockdep_rtnl_is_held())
+
+static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
+{
+ return rtnl_dereference(dev->ingress_queue);
+}
+
+extern struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
+
extern void rtnetlink_init(void);
extern void __rtnl_unlock(void);