switchdev: Adding complete operation to deferred switchdev ops

When using switchdev deferred operation (SWITCHDEV_F_DEFER), the operation
is executed in different context and the application doesn't have any way
to get the operation real status.

Adding a completion callback fixes that. This patch adds fields to
switchdev_attr and switchdev_obj "complete_priv" field which is used by
the "complete" callback.

Application can set a complete function which will be called once the
operation executed.

Signed-off-by: Elad Raz <eladr@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/switchdev.h

@@ -54,6 +54,8 @@ struct switchdev_attr {
 	struct net_device *orig_dev;
 	enum switchdev_attr_id id;
 	u32 flags;
+	void *complete_priv;
+	void (*complete)(struct net_device *dev, int err, void *priv);
 	union {
 		struct netdev_phys_item_id ppid;	/* PORT_PARENT_ID */
 		u8 stp_state;				/* PORT_STP_STATE */
@@ -75,6 +77,8 @@ struct switchdev_obj {
 	struct net_device *orig_dev;
 	enum switchdev_obj_id id;
 	u32 flags;
+	void *complete_priv;
+	void (*complete)(struct net_device *dev, int err, void *priv);
 };
 
 /* SWITCHDEV_OBJ_ID_PORT_VLAN */

net/switchdev/switchdev.c

@@ -305,6 +305,8 @@ static void switchdev_port_attr_set_deferred(struct net_device *dev,
 	if (err && err != -EOPNOTSUPP)
 		netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n",
 			   err, attr->id);
+	if (attr->complete)
+		attr->complete(dev, err, attr->complete_priv);
 }
 
 static int switchdev_port_attr_set_defer(struct net_device *dev,
@@ -434,6 +436,8 @@ static void switchdev_port_obj_add_deferred(struct net_device *dev,
 	if (err && err != -EOPNOTSUPP)
 		netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
 			   err, obj->id);
+	if (obj->complete)
+		obj->complete(dev, err, obj->complete_priv);
 }
 
 static int switchdev_port_obj_add_defer(struct net_device *dev,
@@ -502,6 +506,8 @@ static void switchdev_port_obj_del_deferred(struct net_device *dev,
 	if (err && err != -EOPNOTSUPP)
 		netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
 			   err, obj->id);
+	if (obj->complete)
+		obj->complete(dev, err, obj->complete_priv);
 }
 
 static int switchdev_port_obj_del_defer(struct net_device *dev,