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-rw-r--r--include/linux/netdevice.h5
-rw-r--r--include/net/ip.h5
2 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index cf0923579af4..9ef20389622d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1881,6 +1881,11 @@ struct net_device {
unsigned char if_port;
unsigned char dma;
+ /* Note : dev->mtu is often read without holding a lock.
+ * Writers usually hold RTNL.
+ * It is recommended to use READ_ONCE() to annotate the reads,
+ * and to use WRITE_ONCE() to annotate the writes.
+ */
unsigned int mtu;
unsigned int min_mtu;
unsigned int max_mtu;
diff --git a/include/net/ip.h b/include/net/ip.h
index 02d68e346f67..5b317c9f4470 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -760,4 +760,9 @@ int ip_misc_proc_init(void);
int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
struct netlink_ext_ack *extack);
+static inline bool inetdev_valid_mtu(unsigned int mtu)
+{
+ return likely(mtu >= IPV4_MIN_MTU);
+}
+
#endif /* _IP_H */