diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/netdevice.h | 5 | ||||
| -rw-r--r-- | include/net/ip.h | 5 |
2 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 88292953aa6f..9d639ea51acd 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1848,6 +1848,11 @@ 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 e6609ab69161..df712087320a 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -759,4 +759,9 @@ 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 */ |