iwlwifi: mvm: set BT-coex high priority for 802.1X/4-way-HS

Set BT coex high priority during the 802.1X handshake to avoid
issues where BT is active enough to kill all the big negotiation
frames that we may need to send (e.g. with a large certificate),
leading to the connection not being established correctly. Give
WiFi priority over BT during this short but critical phase.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NLuca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211017165728.a1825bbba397.I10315577fb41dfcec15c92e8f6785d9655f74c6a@changeidSigned-off-by: NLuca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/api/mac.h

@@ -138,6 +138,8 @@ struct iwl_mac_data_ibss {
  * @FLEXIBLE_TWT_SUPPORTED: AP supports flexible TWT schedule
  * @PROTECTED_TWT_SUPPORTED: AP supports protected TWT frames (with 11w)
  * @BROADCAST_TWT_SUPPORTED: AP and STA support broadcast TWT
+ * @COEX_HIGH_PRIORITY_ENABLE: high priority mode for BT coex, to be used
+ *	during 802.1X negotiation (and allowed during 4-way-HS)
  */
 enum iwl_mac_data_policy {
 	TWT_SUPPORTED = BIT(0),
@@ -145,6 +147,7 @@ enum iwl_mac_data_policy {
 	FLEXIBLE_TWT_SUPPORTED = BIT(2),
 	PROTECTED_TWT_SUPPORTED = BIT(3),
 	BROADCAST_TWT_SUPPORTED = BIT(4),
+	COEX_HIGH_PRIORITY_ENABLE = BIT(5),
 };
 
 /**

drivers/net/wireless/intel/iwlwifi/fw/file.h

@@ -420,6 +420,7 @@ enum iwl_ucode_tlv_capa {
 	IWL_UCODE_TLV_CAPA_PASSIVE_6GHZ_SCAN		= (__force iwl_ucode_tlv_capa_t)58,
 	IWL_UCODE_TLV_CAPA_HIDDEN_6GHZ_SCAN		= (__force iwl_ucode_tlv_capa_t)59,
 	IWL_UCODE_TLV_CAPA_BROADCAST_TWT		= (__force iwl_ucode_tlv_capa_t)60,
+	IWL_UCODE_TLV_CAPA_COEX_HIGH_PRIO		= (__force iwl_ucode_tlv_capa_t)61,
 
 	/* set 2 */
 	IWL_UCODE_TLV_CAPA_EXTENDED_DTS_MEASURE		= (__force iwl_ucode_tlv_capa_t)64,

drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c

@@ -604,6 +604,12 @@ static int iwl_mvm_mac_ctxt_cmd_sta(struct iwl_mvm *mvm,
 
 		ctxt_sta->is_assoc = cpu_to_le32(1);
 
+		if (!mvmvif->authorized &&
+		    fw_has_capa(&mvm->fw->ucode_capa,
+				IWL_UCODE_TLV_CAPA_COEX_HIGH_PRIO))
+			ctxt_sta->data_policy |=
+				cpu_to_le32(COEX_HIGH_PRIORITY_ENABLE);
+
 		/*
 		 * allow multicast data frames only as long as the station is
 		 * authorized, i.e., GTK keys are already installed (if needed)

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -3201,6 +3201,8 @@ static int iwl_mvm_mac_sta_state(struct ieee80211_hw *hw,
 			/* enable beacon filtering */
 			WARN_ON(iwl_mvm_enable_beacon_filter(mvm, vif, 0));
 
+			mvmvif->authorized = 1;
+
 			/*
 			 * Now that the station is authorized, i.e., keys were already
 			 * installed, need to indicate to the FW that
@@ -3217,6 +3219,12 @@ static int iwl_mvm_mac_sta_state(struct ieee80211_hw *hw,
 			/* Multicast data frames are no longer allowed */
 			iwl_mvm_mac_ctxt_changed(mvm, vif, false, NULL);
 
+			/*
+			 * Set this after the above iwl_mvm_mac_ctxt_changed()
+			 * to avoid sending high prio again for a little time.
+			 */
+			mvmvif->authorized = 0;
+
 			/* disable beacon filtering */
 			ret = iwl_mvm_disable_beacon_filter(mvm, vif, 0);
 			WARN_ON(ret &&

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -297,6 +297,7 @@ struct iwl_probe_resp_data {
  *	see enum &iwl_mvm_low_latency_cause for causes.
  * @low_latency_actual: boolean, indicates low latency is set,
  *	as a result from low_latency bit flags and takes force into account.
+ * @authorized: indicates the AP station was set to authorized
  * @ps_disabled: indicates that this interface requires PS to be disabled
  * @queue_params: QoS params for this MAC
  * @bcast_sta: station used for broadcast packets. Used by the following
@@ -330,6 +331,7 @@ struct iwl_mvm_vif {
 	bool monitor_active;
 	u8 low_latency: 6;
 	u8 low_latency_actual: 1;
+	u8 authorized:1;
 	bool ps_disabled;
 	struct iwl_mvm_vif_bf_data bf_data;