net: add support for phys_port_name

Similar to port id allow netdevices to specify port names and export
the name via sysfs. Drivers can implement the netdevice operation to
assist udev in having sane default names for the devices using the
rule:

$ cat /etc/udev/rules.d/80-net-setup-link.rules
SUBSYSTEM=="net", ACTION=="add", ATTR{phys_port_name}!="",
NAME="$attr{phys_port_name}"

Use of phys_name versus phys_id was suggested-by Jiri Pirko.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 76c5de4978a8..ec8f9b5f6500 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1164,6 +1164,8 @@ struct net_device_ops {
                                                       bool new_carrier);
         int                     (*ndo_get_phys_port_id)(struct net_device *dev,
                                                         struct netdev_phys_item_id *ppid);
+        int                     (*ndo_get_phys_port_name)(struct net_device *dev,
+                                                          char *name, size_t len);
         void                    (*ndo_add_vxlan_port)(struct  net_device *dev,
                                                       sa_family_t sa_family,
                                                       __be16 port);
@@ -2947,6 +2949,8 @@ int dev_set_mac_address(struct net_device *, struct sockaddr *);
 int dev_change_carrier(struct net_device *, bool new_carrier);
 int dev_get_phys_port_id(struct net_device *dev,
                          struct netdev_phys_item_id *ppid);
+int dev_get_phys_port_name(struct net_device *dev,
+                           char *name, size_t len);
 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev);
 struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
                                     struct netdev_queue *txq, int *ret);
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 756436e1ce89..7158fd00a109 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -147,6 +147,7 @@ enum {
         IFLA_CARRIER_CHANGES,
         IFLA_PHYS_SWITCH_ID,
         IFLA_LINK_NETNSID,
+        IFLA_PHYS_PORT_NAME,
         __IFLA_MAX
 };