net: add ndo to get id of physical port of the device

This patch adds a ndo for getting physical port of the device. Driver
which is aware of being virtual function of some physical port should
implement this ndo. This is applicable not only for IOV, but for other
solutions (NPAR, multichannel) as well. Basically if there is possible
to have multiple netdevs on the single hw port.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 3ca60b070ef0..875f869dc38a 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -728,6 +728,16 @@ struct netdev_fcoe_hbainfo {
 };
 #endif
 
+#define MAX_PHYS_PORT_ID_LEN 32
+
+/* This structure holds a unique identifier to identify the
+ * physical port used by a netdevice.
+ */
+struct netdev_phys_port_id {
+        unsigned char id[MAX_PHYS_PORT_ID_LEN];
+        unsigned char id_len;
+};
+
 /*
  * This structure defines the management hooks for network devices.
  * The following hooks can be defined; unless noted otherwise, they are
@@ -932,6 +942,12 @@ struct netdev_fcoe_hbainfo {
  *      that determine carrier state from physical hardware properties (eg
  *      network cables) or protocol-dependent mechanisms (eg
  *      USB_CDC_NOTIFY_NETWORK_CONNECTION) should NOT implement this function.
+ *
+ * int (*ndo_get_phys_port_id)(struct net_device *dev,
+ *                             struct netdev_phys_port_id *ppid);
+ *      Called to get ID of physical port of this device. If driver does
+ *      not implement this, it is assumed that the hw is not able to have
+ *      multiple net devices on single physical port.
  */
 struct net_device_ops {
         int                     (*ndo_init)(struct net_device *dev);
@@ -1060,6 +1076,8 @@ struct net_device_ops {
                                                       struct nlmsghdr *nlh);
         int                     (*ndo_change_carrier)(struct net_device *dev,
                                                       bool new_carrier);
+        int                     (*ndo_get_phys_port_id)(struct net_device *dev,
+                                                        struct netdev_phys_port_id *ppid);
 };
 
 /*
@@ -2315,6 +2333,8 @@ extern int		dev_set_mac_address(struct net_device *,
                                             struct sockaddr *);
 extern int              dev_change_carrier(struct net_device *,
                                            bool new_carrier);
+extern int              dev_get_phys_port_id(struct net_device *dev,
+                                             struct netdev_phys_port_id *ppid);
 extern int              dev_hard_start_xmit(struct sk_buff *skb,
                                             struct net_device *dev,
                                             struct netdev_queue *txq);