net: introduce generic switch devices support

The goal of this is to provide a possibility to support various switch
chips. Drivers should implement relevant ndos to do so. Now there is
only one ndo defined:
- for getting physical switch id is in place.

Note that user can use random port netdevice to access the switch.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Reviewed-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 4bd41d72559d..3603f31e78f3 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1018,6 +1018,12 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
  *      performing GSO on a packet. The device returns true if it is
  *      able to GSO the packet, false otherwise. If the return value is
  *      false the stack will do software GSO.
+ *
+ * int (*ndo_switch_parent_id_get)(struct net_device *dev,
+ *                                 struct netdev_phys_item_id *psid);
+ *      Called to get an ID of the switch chip this port is part of.
+ *      If driver implements this, it indicates that it represents a port
+ *      of a switch chip.
  */
 struct net_device_ops {
         int                     (*ndo_init)(struct net_device *dev);
@@ -1171,6 +1177,10 @@ struct net_device_ops {
         int                     (*ndo_get_lock_subclass)(struct net_device *dev);
         bool                    (*ndo_gso_check) (struct sk_buff *skb,
                                                   struct net_device *dev);
+#ifdef CONFIG_NET_SWITCHDEV
+        int                     (*ndo_switch_parent_id_get)(struct net_device *dev,
+                                                            struct netdev_phys_item_id *psid);
+#endif
 };
 
 /**