wifi: cfg80211: add inform_bss op to update BSS

This new function is called from within the inform_bss(_frame)_data
functions in order for the driver to update data that it is tracking.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230616094949.8d7781b0f965.I80041183072b75c081996a1a5a230b34aff5c668@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/cfg80211.h

@@ -2720,6 +2720,7 @@ enum cfg80211_signal_type {
  *	the BSS that requested the scan in which the beacon/probe was received.
  * @chains: bitmask for filled values in @chain_signal.
  * @chain_signal: per-chain signal strength of last received BSS in dBm.
+ * @drv_data: Data to be passed through to @inform_bss
  */
 struct cfg80211_inform_bss {
 	struct ieee80211_channel *chan;
@@ -2730,6 +2731,8 @@ struct cfg80211_inform_bss {
 	u8 parent_bssid[ETH_ALEN] __aligned(2);
 	u8 chains;
 	s8 chain_signal[IEEE80211_MAX_CHAINS];
+
+	void *drv_data;
 };
 
 /**
@@ -4101,6 +4104,13 @@ struct mgmt_frame_regs {
  *
  * @change_bss: Modify parameters for a given BSS.
  *
+ * @inform_bss: Called by cfg80211 while being informed about new BSS data
+ *	for every BSS found within the reported data or frame. This is called
+ *	from within the cfg8011 inform_bss handlers while holding the bss_lock.
+ *	The data parameter is passed through from drv_data inside
+ *	struct cfg80211_inform_bss.
+ *	The new IE data for the BSS is explicitly passed.
+ *
  * @set_txq_params: Set TX queue parameters
  *
  * @libertas_set_mesh_channel: Only for backward compatibility for libertas,
@@ -4488,6 +4498,9 @@ struct cfg80211_ops {
 	int	(*change_bss)(struct wiphy *wiphy, struct net_device *dev,
 			      struct bss_parameters *params);
 
+	void	(*inform_bss)(struct wiphy *wiphy, struct cfg80211_bss *bss,
+			      const struct cfg80211_bss_ies *ies, void *data);
+
 	int	(*set_txq_params)(struct wiphy *wiphy, struct net_device *dev,
 				  struct ieee80211_txq_params *params);
 

net/wireless/rdev-ops.h

@@ -407,6 +407,18 @@ static inline int rdev_change_bss(struct cfg80211_registered_device *rdev,
 	return ret;
 }
 
+static inline void rdev_inform_bss(struct cfg80211_registered_device *rdev,
+				   struct cfg80211_bss *bss,
+				   const struct cfg80211_bss_ies *ies,
+				   void *drv_data)
+
+{
+	trace_rdev_inform_bss(&rdev->wiphy, bss);
+	if (rdev->ops->inform_bss)
+		rdev->ops->inform_bss(&rdev->wiphy, bss, ies, drv_data);
+	trace_rdev_return_void(&rdev->wiphy);
+}
+
 static inline int rdev_set_txq_params(struct cfg80211_registered_device *rdev,
 				      struct net_device *dev,
 				      struct ieee80211_txq_params *params)

net/wireless/scan.c

@@ -2027,6 +2027,8 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 	if (!res)
 		goto drop;
 
+	rdev_inform_bss(rdev, &res->pub, ies, data->drv_data);
+
 	if (non_tx_data) {
 		/* this is a nontransmitting bss, we need to add it to
 		 * transmitting bss' list if it is not there
@@ -2502,6 +2504,8 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
 	if (!res)
 		goto drop;
 
+	rdev_inform_bss(rdev, &res->pub, ies, data->drv_data);
+
 	spin_unlock_bh(&rdev->bss_lock);
 
 	trace_cfg80211_return_bss(&res->pub);

net/wireless/trace.h

@@ -1159,6 +1159,23 @@ TRACE_EVENT(rdev_change_bss,
 		  __entry->ap_isolate, __entry->ht_opmode)
 );
 
+TRACE_EVENT(rdev_inform_bss,
+	TP_PROTO(struct wiphy *wiphy, struct cfg80211_bss *bss),
+	TP_ARGS(wiphy, bss),
+	TP_STRUCT__entry(
+		WIPHY_ENTRY
+		MAC_ENTRY(bssid)
+		CHAN_ENTRY
+	),
+	TP_fast_assign(
+		WIPHY_ASSIGN;
+		MAC_ASSIGN(bssid, bss->bssid);
+		CHAN_ASSIGN(bss->channel);
+	),
+	TP_printk(WIPHY_PR_FMT ", %pM, " CHAN_PR_FMT,
+		  WIPHY_PR_ARG, __entry->bssid, CHAN_PR_ARG)
+);
+
 TRACE_EVENT(rdev_set_txq_params,
 	TP_PROTO(struct wiphy *wiphy, struct net_device *netdev,
 		 struct ieee80211_txq_params *params),