nl80211: prepare for non-netdev wireless devs
In order to support a P2P device abstraction and
Bluetooth high-speed AMPs, we need to have a way
to identify virtual interfaces that don't have a
netdev associated.
Do this by adding a NL80211_ATTR_WDEV attribute
to identify a wdev which may or may not also be
a netdev.
To simplify things, use a 64-bit value with the
high 32 bits being the wiphy index for this new
wdev identifier in the nl80211 API.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index db961a5..e791487 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -771,6 +771,9 @@
* @NL80211_ATTR_IFNAME: network interface name
* @NL80211_ATTR_IFTYPE: type of virtual interface, see &enum nl80211_iftype
*
+ * @NL80211_ATTR_WDEV: wireless device identifier, used for pseudo-devices
+ * that don't have a netdev (u64)
+ *
* @NL80211_ATTR_MAC: MAC address (various uses)
*
* @NL80211_ATTR_KEY_DATA: (temporal) key data; for TKIP this consists of
@@ -1493,6 +1496,8 @@
NL80211_ATTR_BG_SCAN_PERIOD,
+ NL80211_ATTR_WDEV,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 51f67a9..a14e6a4 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2341,17 +2341,25 @@
struct cfg80211_cached_keys;
/**
- * struct wireless_dev - wireless per-netdev state
+ * struct wireless_dev - wireless device state
*
- * This structure must be allocated by the driver/stack
- * that uses the ieee80211_ptr field in struct net_device
- * (this is intentional so it can be allocated along with
- * the netdev.)
+ * For netdevs, this structure must be allocated by the driver
+ * that uses the ieee80211_ptr field in struct net_device (this
+ * is intentional so it can be allocated along with the netdev.)
+ * It need not be registered then as netdev registration will
+ * be intercepted by cfg80211 to see the new wireless device.
+ *
+ * For non-netdev uses, it must also be allocated by the driver
+ * in response to the cfg80211 callbacks that require it, as
+ * there's no netdev registration in that case it may not be
+ * allocated outside of callback operations that return it.
*
* @wiphy: pointer to hardware description
* @iftype: interface type
* @list: (private) Used to collect the interfaces
- * @netdev: (private) Used to reference back to the netdev
+ * @netdev: (private) Used to reference back to the netdev, may be %NULL
+ * @identifier: (private) Identifier used in nl80211 to identify this
+ * wireless device if it has no netdev
* @current_bss: (private) Used by the internal configuration code
* @channel: (private) Used by the internal configuration code to track
* the user-set AP, monitor and WDS channel
@@ -2383,6 +2391,8 @@
struct list_head list;
struct net_device *netdev;
+ u32 identifier;
+
struct list_head mgmt_registrations;
spinlock_t mgmt_registrations_lock;