iwlwifi: mvm: use the new session protection command

The firmware has now a new session protection command.
This new API allows the firmware to manage the protection
needed for association. It'll also remove the event when
the association is complete.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

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

@@ -8,7 +8,7 @@
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
- * Copyright(c) 2018 Intel Corporation
+ * Copyright(c) 2018 - 2019 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -31,7 +31,7 @@
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
- * Copyright(c) 2018 Intel Corporation
+ * Copyright(c) 2018 - 2019 Intel Corporation
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -77,6 +77,16 @@ enum iwl_mac_conf_subcmd_ids {
 	 * @CHANNEL_SWITCH_TIME_EVENT_CMD: &struct iwl_chan_switch_te_cmd
 	 */
 	CHANNEL_SWITCH_TIME_EVENT_CMD = 0x4,
+	/**
+	 * @SESSION_PROTECTION_CMD: &struct iwl_mvm_session_prot_cmd
+	 */
+	SESSION_PROTECTION_CMD = 0x5,
+
+	/**
+	 * @SESSION_PROTECTION_NOTIF: &struct iwl_mvm_session_prot_notif
+	 */
+	SESSION_PROTECTION_NOTIF = 0xFB,
+
 	/**
 	 * @PROBE_RESPONSE_DATA_NOTIF: &struct iwl_probe_resp_data_notif
 	 */

drivers/net/wireless/intel/iwlwifi/fw/api/time-event.h

@@ -8,7 +8,7 @@
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
- * Copyright(c) 2018        Intel Corporation
+ * Copyright(c) 2018 - 2019 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -31,7 +31,7 @@
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
- * Copyright(c) 2018        Intel Corporation
+ * Copyright(c) 2018 - 2019 Intel Corporation
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -393,4 +393,80 @@ struct iwl_hs20_roc_res {
 	__le32 status;
 } __packed; /* HOT_SPOT_RSP_API_S_VER_1 */
 
+/**
+ * enum iwl_mvm_session_prot_conf_id - session protection's configurations
+ * @SESSION_PROTECT_CONF_ASSOC: Start a session protection for association.
+ *	The firmware will allocate two events.
+ *	Valid for BSS_STA and P2P_STA.
+ *	* A rather short event that can't be fragmented and with a very
+ *	high priority. If every goes well (99% of the cases) the
+ *	association should complete within this first event. During
+ *	that event, no other activity will happen in the firmware,
+ *	which is why it can't be too long.
+ *	The length of this event is hard-coded in the firmware: 300TUs.
+ *	* Another event which can be much longer (it's duration is
+ *	configurable by the driver) which has a slightly lower
+ *	priority and that can be fragmented allowing other activities
+ *	to run while this event is running.
+ *	The firmware will automatically remove both events once the driver sets
+ *	the BSS MAC as associated. Neither of the events will be removed
+ *	for the P2P_STA MAC.
+ *	Only the duration is configurable for this protection.
+ * @SESSION_PROTECT_CONF_GO_CLIENT_ASSOC: not used
+ * @SESSION_PROTECT_CONF_P2P_DEVICE_DISCOV: Schedule the P2P Device to be in
+ *	listen mode. Will be fragmented. Valid only on the P2P Device MAC.
+ *	Valid only on the P2P Device MAC. The firmware will take into account
+ *	the duration, the interval and the repetition count.
+ * @SESSION_PROTECT_CONF_P2P_GO_NEGOTIATION: Schedule the P2P Device to be be
+ *	able to run the GO Negotiation. Will not be fragmented and not
+ *	repetitive. Valid only on the P2P Device MAC. Only the duration will
+ *	be taken into account.
+ */
+enum iwl_mvm_session_prot_conf_id {
+	SESSION_PROTECT_CONF_ASSOC,
+	SESSION_PROTECT_CONF_GO_CLIENT_ASSOC,
+	SESSION_PROTECT_CONF_P2P_DEVICE_DISCOV,
+	SESSION_PROTECT_CONF_P2P_GO_NEGOTIATION,
+}; /* SESSION_PROTECTION_CONF_ID_E_VER_1 */
+
+/**
+ * struct iwl_mvm_session_prot_cmd - configure a session protection
+ * @id_and_color: the id and color of the mac for which this session protection
+ *	is sent
+ * @action: can be either FW_CTXT_ACTION_ADD or FW_CTXT_ACTION_REMOVE
+ * @conf_id: see &enum iwl_mvm_session_prot_conf_id
+ * @duration_tu: the duration of the whole protection in TUs.
+ * @repetition_count: not used
+ * @interval: not used
+ *
+ * Note: the session protection will always be scheduled to start as
+ * early as possible, but the maximum delay is configuration dependent.
+ * The firmware supports only one concurrent session protection per vif.
+ * Adding a new session protection will remove any currently running session.
+ */
+struct iwl_mvm_session_prot_cmd {
+	/* COMMON_INDEX_HDR_API_S_VER_1 hdr */
+	__le32 id_and_color;
+	__le32 action;
+	__le32 conf_id;
+	__le32 duration_tu;
+	__le32 repetition_count;
+	__le32 interval;
+} __packed; /* SESSION_PROTECTION_CMD_API_S_VER_1 */
+
+/**
+ * struct iwl_mvm_session_prot_notif - session protection started / ended
+ * @mac_id: the mac id for which the session protection started / ended
+ * @status: 1 means success, 0 means failure
+ * @start: 1 means the session protection started, 0 means it ended
+ *
+ * Note that any session protection will always get two notifications: start
+ * and end even the firmware could not schedule it.
+ */
+struct iwl_mvm_session_prot_notif {
+	__le32 mac_id;
+	__le32 status;
+	__le32 start;
+} __packed; /* SESSION_PROTECTION_NOTIFICATION_API_S_VER_1 */
+
 #endif /* __iwl_fw_api_time_event_h__ */

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

@@ -445,6 +445,7 @@ enum iwl_ucode_tlv_capa {
 	IWL_UCODE_TLV_CAPA_CS_MODIFY			= (__force iwl_ucode_tlv_capa_t)49,
 	IWL_UCODE_TLV_CAPA_SET_LTR_GEN2			= (__force iwl_ucode_tlv_capa_t)50,
 	IWL_UCODE_TLV_CAPA_SET_PPAG			= (__force iwl_ucode_tlv_capa_t)52,
+	IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD		= (__force iwl_ucode_tlv_capa_t)54,
 
 	/* set 2 */
 	IWL_UCODE_TLV_CAPA_EXTENDED_DTS_MEASURE		= (__force iwl_ucode_tlv_capa_t)64,

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

@@ -2280,7 +2280,9 @@ static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
 			}
 
 			if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART,
-				     &mvm->status)) {
+				     &mvm->status) &&
+			    !fw_has_capa(&mvm->fw->ucode_capa,
+					 IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD)) {
 				/*
 				 * If we're restarting then the firmware will
 				 * obviously have lost synchronisation with
@@ -2294,6 +2296,10 @@ static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
 				 *
 				 * Set a large maximum delay to allow for more
 				 * than a single interface.
+				 *
+				 * For new firmware versions, rely on the
+				 * firmware. This is relevant for DCM scenarios
+				 * only anyway.
 				 */
 				u32 dur = (11 * vif->bss_conf.beacon_int) / 10;
 				iwl_mvm_protect_session(mvm, vif, dur, dur,
@@ -2384,8 +2390,11 @@ static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
 		/*
 		 * We received a beacon from the associated AP so
 		 * remove the session protection.
+		 * A firmware with the new API will remove it automatically.
 		 */
-		iwl_mvm_stop_session_protection(mvm, vif);
+		if (!fw_has_capa(&mvm->fw->ucode_capa,
+				 IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD))
+			iwl_mvm_stop_session_protection(mvm, vif);
 
 		iwl_mvm_sf_update(mvm, vif, false);
 		WARN_ON(iwl_mvm_enable_beacon_filter(mvm, vif, 0));
@@ -3255,8 +3264,22 @@ static void iwl_mvm_mac_mgd_prepare_tx(struct ieee80211_hw *hw,
 		duration = req_duration;
 
 	mutex_lock(&mvm->mutex);
-	/* Try really hard to protect the session and hear a beacon */
-	iwl_mvm_protect_session(mvm, vif, duration, min_duration, 500, false);
+	/* Try really hard to protect the session and hear a beacon
+	 * The new session protection command allows us to protect the
+	 * session for a much longer time since the firmware will internally
+	 * create two events: a 300TU one with a very high priority that
+	 * won't be fragmented which should be enough for 99% of the cases,
+	 * and another one (which we configure here to be 900TU long) which
+	 * will have a slightly lower priority, but more importantly, can be
+	 * fragmented so that it'll allow other activities to run.
+	 */
+	if (fw_has_capa(&mvm->fw->ucode_capa,
+			IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD))
+		iwl_mvm_schedule_session_protection(mvm, vif, 900,
+						    min_duration);
+	else
+		iwl_mvm_protect_session(mvm, vif, duration,
+					min_duration, 500, false);
 	mutex_unlock(&mvm->mutex);
 }
 
@@ -3848,7 +3871,7 @@ static int iwl_mvm_cancel_roc(struct ieee80211_hw *hw,
 	IWL_DEBUG_MAC80211(mvm, "enter\n");
 
 	mutex_lock(&mvm->mutex);
-	iwl_mvm_stop_roc(mvm);
+	iwl_mvm_stop_roc(mvm, vif);
 	mutex_unlock(&mvm->mutex);
 
 	IWL_DEBUG_MAC80211(mvm, "leave\n");

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

@@ -263,6 +263,8 @@ static const struct iwl_rx_handlers iwl_mvm_rx_handlers[] = {
 
 	RX_HANDLER(TIME_EVENT_NOTIFICATION, iwl_mvm_rx_time_event_notif,
 		   RX_HANDLER_SYNC),
+	RX_HANDLER_GRP(MAC_CONF_GROUP, SESSION_PROTECTION_NOTIF,
+		       iwl_mvm_rx_session_protect_notif, RX_HANDLER_SYNC),
 	RX_HANDLER(MCC_CHUB_UPDATE_CMD, iwl_mvm_rx_chub_update_mcc,
 		   RX_HANDLER_ASYNC_LOCKED),
 
@@ -432,6 +434,8 @@ static const struct iwl_hcmd_names iwl_mvm_system_names[] = {
  */
 static const struct iwl_hcmd_names iwl_mvm_mac_conf_names[] = {
 	HCMD_NAME(CHANNEL_SWITCH_TIME_EVENT_CMD),
+	HCMD_NAME(SESSION_PROTECTION_CMD),
+	HCMD_NAME(SESSION_PROTECTION_NOTIF),
 	HCMD_NAME(CHANNEL_SWITCH_NOA_NOTIF),
 };