cfg80211: change internal management frame registration API

Almost all drivers below cfg80211 get the API wrong (except for
cfg80211) and are unable to cope with multiple registrations for
the same frame type, which is valid due to the match filter.
This seems to indicate the API is wrong, and we should maintain
the full information in cfg80211 instead of the drivers.

Change the API to no longer inform the driver about individual
registrations and unregistrations, but rather every time about
the entire state of the entire wiphy and single wdev, whenever
it may have changed. This also simplifies the code in cfg80211
as it no longer has to track exactly what was unregistered and
can free things immediately.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Reviewed-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Link: https://lore.kernel.org/r/20200417124300.f47f3828afc8.I7f81ef59c2c5a340d7075fb3c6d0e08e8aeffe07@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 19 insertions, 6 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 775952677b3d..bc273f6d60f2 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -3385,6 +3385,17 @@ struct cfg80211_update_owe_info {
 };
 
 /**
+ * struct mgmt_frame_regs - management frame registrations data
+ * @global_stypes: bitmap of management frame subtypes registered
+ *	for the entire device
+ * @interface_stypes: bitmap of management frame subtypes registered
+ *	for the given interface
+ */
+struct mgmt_frame_regs {
+	u32 global_stypes, interface_stypes;
+};
+
+/**
  * struct cfg80211_ops - backend description for wireless configuration
  *
  * This struct is registered by fullmac card drivers and/or wireless stacks
@@ -3608,8 +3619,8 @@ struct cfg80211_update_owe_info {
  *	The driver should not call cfg80211_sched_scan_stopped() for a requested
  *	stop (when this method returns 0).
  *
- * @mgmt_frame_register: Notify driver that a management frame type was
- *	registered. The callback is allowed to sleep.
+ * @update_mgmt_frame_registrations: Notify the driver that management frame
+ *	registrations were updated. The callback is allowed to sleep.
  *
  * @set_antenna: Set antenna configuration (tx_ant, rx_ant) on the device.
  *	Parameters are bitmaps of allowed antennas to use for TX/RX. Drivers may
@@ -3932,9 +3943,9 @@ struct cfg80211_ops {
 				      struct net_device *dev,
 				      u32 rate, u32 pkts, u32 intvl);
 
-	void	(*mgmt_frame_register)(struct wiphy *wiphy,
-				       struct wireless_dev *wdev,
-				       u16 frame_type, bool reg);
+	void	(*update_mgmt_frame_registrations)(struct wiphy *wiphy,
+						   struct wireless_dev *wdev,
+						   struct mgmt_frame_regs *upd);
 
 	int	(*set_antenna)(struct wiphy *wiphy, u32 tx_ant, u32 rx_ant);
 	int	(*get_antenna)(struct wiphy *wiphy, u32 *tx_ant, u32 *rx_ant);
@@ -5015,6 +5026,7 @@ struct cfg80211_cqm_config;
  *	by cfg80211 on change_interface
  * @mgmt_registrations: list of registrations for management frames
  * @mgmt_registrations_lock: lock for the list
+ * @mgmt_registrations_update_wk: update work to defer from atomic context
  * @mtx: mutex used to lock data in this struct, may be used by drivers
  *	and some API functions require it held
  * @beacon_interval: beacon interval used on this device for transmitting
@@ -5060,6 +5072,7 @@ struct wireless_dev {
 
 	struct list_head mgmt_registrations;
 	spinlock_t mgmt_registrations_lock;
+	struct work_struct mgmt_registrations_update_wk;
 
 	struct mutex mtx;
 
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index b6b4de0e4b5e..f6dc5a38720f 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1647,7 +1647,7 @@ struct ieee80211_vif {
 	struct dentry *debugfs_dir;
 #endif
 
-	unsigned int probe_req_reg;
+	bool probe_req_reg;
 
 	bool txqs_stopped[IEEE80211_NUM_ACS];