wwan: core: support default netdev creation

Most, if not each WWAN device driver will create a netdev for the
default data channel. Therefore, add an option for the WWAN netdev ops
registration function to create a default netdev for the WWAN device.

A WWAN device driver should pass a default data channel link id to the
ops registering function to request the creation of a default netdev, or
a special value WWAN_NO_DEFAULT_LINK to inform the WWAN core that the
default netdev should not be created.

For now, only wwan_hwsim utilize the default link creation option. Other
drivers will be reworked next.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
CC: M Chetan Kumar <m.chetan.kumar@intel.com>
CC: Intel Corporation <linuxwwan@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 1 deletions

diff --git a/include/linux/wwan.h b/include/linux/wwan.h
index e1981ea3a2fd..91590db70a12 100644
--- a/include/linux/wwan.h
+++ b/include/linux/wwan.h
@@ -126,6 +126,12 @@ void wwan_port_txon(struct wwan_port *port);
  */
 void *wwan_port_get_drvdata(struct wwan_port *port);
 
+/*
+ * Used to indicate that the WWAN core should not create a default network
+ * link.
+ */
+#define WWAN_NO_DEFAULT_LINK		U32_MAX
+
 /**
  * struct wwan_ops - WWAN device ops
  * @priv_size: size of private netdev data area
@@ -143,7 +149,7 @@ struct wwan_ops {
 };
 
 int wwan_register_ops(struct device *parent, const struct wwan_ops *ops,
-		      void *ctxt);
+		      void *ctxt, u32 def_link_id);
 
 void wwan_unregister_ops(struct device *parent);