wifi: iwlwifi: mvm: coex: start handling multiple links

Iterate all the links here and check which ones are active,
then adjust them accordingly.

This is still wrong as far as the RSSI event is concerned
(calling iwl_mvm_bt_coex_enable_rssi_event) since we call
that now multiple times, which could overwrite the data;
we need to either make that per link or call it only once,
but need to sort out first what the firmware will be doing
for beacon filtering/beacon abort in MLO.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230329100039.fe813fd8de5d.I216236717876510e51e4c21c7fac7691925443f1@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/coex.c

@@ -257,33 +257,35 @@ static void iwl_mvm_bt_coex_tcm_based_ci(struct iwl_mvm *mvm,
 	swap(data->primary, data->secondary);
 }
 
-/* must be called under rcu_read_lock */
-static void iwl_mvm_bt_notif_iterator(void *_data, u8 *mac,
-				      struct ieee80211_vif *vif)
+static void iwl_mvm_bt_notif_per_link(struct iwl_mvm *mvm,
+				      struct ieee80211_vif *vif,
+				      struct iwl_bt_iterator_data *data,
+				      unsigned int link_id)
 {
-	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
-	struct iwl_bt_iterator_data *data = _data;
-	struct iwl_mvm *mvm = data->mvm;
-	struct ieee80211_chanctx_conf *chanctx_conf;
 	/* default smps_mode is AUTOMATIC - only used for client modes */
 	enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_AUTOMATIC;
+	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 	u32 bt_activity_grading, min_ag_for_static_smps;
+	struct ieee80211_chanctx_conf *chanctx_conf;
+	struct iwl_mvm_vif_link_info *link_info;
+	struct ieee80211_bss_conf *link_conf;
 	int ave_rssi;
 
 	lockdep_assert_held(&mvm->mutex);
 
-	switch (vif->type) {
-	case NL80211_IFTYPE_STATION:
-		break;
-	case NL80211_IFTYPE_AP:
-		if (!mvmvif->ap_ibss_active)
-			return;
-		break;
-	default:
+	link_info = mvmvif->link[link_id];
+	if (!link_info)
 		return;
-	}
 
-	chanctx_conf = rcu_dereference(vif->bss_conf.chanctx_conf);
+	link_conf = rcu_dereference(vif->link_conf[link_id]);
+	/* This can happen due to races: if we receive the notification
+	 * and have the mutex held, while mac80211 is stuck on our mutex
+	 * in the middle of removing the link.
+	 */
+	if (!link_conf)
+		return;
+
+	chanctx_conf = rcu_dereference(link_conf->chanctx_conf);
 
 	/* If channel context is invalid or not on 2.4GHz .. */
 	if ((!chanctx_conf ||
@@ -291,10 +293,10 @@ static void iwl_mvm_bt_notif_iterator(void *_data, u8 *mac,
 		if (vif->type == NL80211_IFTYPE_STATION) {
 			/* ... relax constraints and disable rssi events */
 			iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_BT_COEX,
-					    smps_mode, 0);
-			iwl_mvm_bt_coex_reduced_txp(mvm,
-						    mvmvif->deflink.ap_sta_id,
+					    smps_mode, link_id);
+			iwl_mvm_bt_coex_reduced_txp(mvm, link_info->ap_sta_id,
 						    false);
+			/* FIXME: should this be per link? */
 			iwl_mvm_bt_coex_enable_rssi_event(mvm, vif, false, 0);
 		}
 		return;
@@ -315,17 +317,18 @@ static void iwl_mvm_bt_notif_iterator(void *_data, u8 *mac,
 	if (!vif->cfg.assoc)
 		smps_mode = IEEE80211_SMPS_AUTOMATIC;
 
-	if (mvmvif->deflink.phy_ctxt &&
-	    (mvm->last_bt_notif.rrc_status & BIT(mvmvif->deflink.phy_ctxt->id)))
+	if (link_info->phy_ctxt &&
+	    (mvm->last_bt_notif.rrc_status & BIT(link_info->phy_ctxt->id)))
 		smps_mode = IEEE80211_SMPS_AUTOMATIC;
 
 	IWL_DEBUG_COEX(data->mvm,
-		       "mac %d: bt_activity_grading %d smps_req %d\n",
-		       mvmvif->id, bt_activity_grading, smps_mode);
+		       "mac %d link %d: bt_activity_grading %d smps_req %d\n",
+		       mvmvif->id, link_info->fw_link_id,
+		       bt_activity_grading, smps_mode);
 
 	if (vif->type == NL80211_IFTYPE_STATION)
 		iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_BT_COEX,
-				    smps_mode, 0);
+				    smps_mode, link_id);
 
 	/* low latency is always primary */
 	if (iwl_mvm_vif_low_latency(mvmvif)) {
@@ -354,6 +357,7 @@ static void iwl_mvm_bt_notif_iterator(void *_data, u8 *mac,
 			data->secondary = chanctx_conf;
 		}
 
+		/* FIXME: TCM load per interface? or need something per link? */
 		if (data->primary == chanctx_conf)
 			data->primary_load = mvm->tcm.result.load[mvmvif->id];
 		else if (data->secondary == chanctx_conf)
@@ -371,6 +375,7 @@ static void iwl_mvm_bt_notif_iterator(void *_data, u8 *mac,
 		/* if secondary is not NULL, it might be a GO */
 		data->secondary = chanctx_conf;
 
+	/* FIXME: TCM load per interface? or need something per link? */
 	if (data->primary == chanctx_conf)
 		data->primary_load = mvm->tcm.result.load[mvmvif->id];
 	else if (data->secondary == chanctx_conf)
@@ -385,8 +390,8 @@ static void iwl_mvm_bt_notif_iterator(void *_data, u8 *mac,
 	if (iwl_get_coex_type(mvm, vif) == BT_COEX_LOOSE_LUT ||
 	    mvm->cfg->bt_shared_single_ant || !vif->cfg.assoc ||
 	    le32_to_cpu(mvm->last_bt_notif.bt_activity_grading) == BT_OFF) {
-		iwl_mvm_bt_coex_reduced_txp(mvm, mvmvif->deflink.ap_sta_id,
-					    false);
+		iwl_mvm_bt_coex_reduced_txp(mvm, link_info->ap_sta_id, false);
+		/* FIXME: should this be per link? */
 		iwl_mvm_bt_coex_enable_rssi_event(mvm, vif, false, 0);
 		return;
 	}
@@ -398,11 +403,11 @@ static void iwl_mvm_bt_notif_iterator(void *_data, u8 *mac,
 	if (!ave_rssi)
 		ave_rssi = -100;
 	if (ave_rssi > -IWL_MVM_BT_COEX_EN_RED_TXP_THRESH) {
-		if (iwl_mvm_bt_coex_reduced_txp(mvm, mvmvif->deflink.ap_sta_id,
+		if (iwl_mvm_bt_coex_reduced_txp(mvm, link_info->ap_sta_id,
 						true))
 			IWL_ERR(mvm, "Couldn't send BT_CONFIG cmd\n");
 	} else if (ave_rssi < -IWL_MVM_BT_COEX_DIS_RED_TXP_THRESH) {
-		if (iwl_mvm_bt_coex_reduced_txp(mvm, mvmvif->deflink.ap_sta_id,
+		if (iwl_mvm_bt_coex_reduced_txp(mvm, link_info->ap_sta_id,
 						false))
 			IWL_ERR(mvm, "Couldn't send BT_CONFIG cmd\n");
 	}
@@ -411,6 +416,32 @@ static void iwl_mvm_bt_notif_iterator(void *_data, u8 *mac,
 	iwl_mvm_bt_coex_enable_rssi_event(mvm, vif, true, ave_rssi);
 }
 
+/* must be called under rcu_read_lock */
+static void iwl_mvm_bt_notif_iterator(void *_data, u8 *mac,
+				      struct ieee80211_vif *vif)
+{
+	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+	struct iwl_bt_iterator_data *data = _data;
+	struct iwl_mvm *mvm = data->mvm;
+	unsigned int link_id;
+
+	lockdep_assert_held(&mvm->mutex);
+
+	switch (vif->type) {
+	case NL80211_IFTYPE_STATION:
+		break;
+	case NL80211_IFTYPE_AP:
+		if (!mvmvif->ap_ibss_active)
+			return;
+		break;
+	default:
+		return;
+	}
+
+	for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
+		iwl_mvm_bt_notif_per_link(mvm, vif, data, link_id);
+}
+
 static void iwl_mvm_bt_coex_notif_handle(struct iwl_mvm *mvm)
 {
 	struct iwl_bt_iterator_data data = {

drivers/net/wireless/intel/iwlwifi/mvm/utils.c

@@ -296,6 +296,10 @@ void iwl_mvm_update_smps(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 		return;
 
 	mvmvif = iwl_mvm_vif_from_mac80211(vif);
+
+	if (WARN_ON_ONCE(!mvmvif->link[link_id]))
+		return;
+
 	mvmvif->link[link_id]->smps_requests[req_type] = smps_request;
 	for (i = 0; i < NUM_IWL_MVM_SMPS_REQ; i++) {
 		if (mvmvif->link[link_id]->smps_requests[i] ==