mac802154: add wpan_phy priv id

This patch adds an unique id for an wpan_phy. This behaviour is mostly
grabbed from wireless stack. This is needed for upcomming patches which
identify the wpan netdev while NETDEV_CHANGENAME in netdev notify function.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

include/net/cfg802154.h

@@ -42,6 +42,14 @@ struct cfg802154_ops {
 struct wpan_phy {
 	struct mutex pib_lock;
 
+	/* If multiple wpan_phys are registered and you're handed e.g.
+	 * a regular netdev with assigned ieee802154_ptr, you won't
+	 * know whether it points to a wpan_phy your driver has registered
+	 * or not. Assign this to something global to your driver to
+	 * help determine whether you own this wpan_phy or not.
+	 */
+	const void *privid;
+
 	/*
 	 * This is a PIB according to 802.15.4-2011.
 	 * We do not provide timing-related variables, as they

net/mac802154/ieee802154_i.h

@@ -96,6 +96,9 @@ struct ieee802154_sub_if_data {
 
 #define MAC802154_CHAN_NONE		0xff /* No channel is assigned */
 
+/* utility functions/constants */
+extern const void *const mac802154_wpan_phy_privid; /*  for wpan_phy privid */
+
 static inline struct ieee802154_local *
 hw_to_local(struct ieee802154_hw *hw)
 {

net/mac802154/main.c

@@ -92,6 +92,8 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
 		return NULL;
 	}
 
+	phy->privid = mac802154_wpan_phy_privid;
+
 	local = wpan_phy_priv(phy);
 	local->phy = phy;
 	local->hw.phy = local->phy;

net/mac802154/util.c

@@ -15,6 +15,9 @@
 
 #include "ieee802154_i.h"
 
+/* privid for wpan_phys to determine whether they belong to us or not */
+const void *const mac802154_wpan_phy_privid = &mac802154_wpan_phy_privid;
+
 void ieee802154_wake_queue(struct ieee802154_hw *hw)
 {
 	struct ieee802154_local *local = hw_to_local(hw);