iwlwifi: mvm: configure scheduled scan according to traffic conditions

Change scan configuration (dwell time, suspend time etc.) according
to traffic conditions. This is useful for scans that are managed by
the FW (e.g. scheduled scan).

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

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

@@ -993,6 +993,7 @@ static void iwl_mvm_restart_cleanup(struct iwl_mvm *mvm)
 	mvm->vif_count = 0;
 	mvm->rx_ba_sessions = 0;
 	mvm->fw_dbg_conf = FW_DBG_INVALID;
+	mvm->scan_type = IWL_SCAN_TYPE_NOT_SET;
 
 	/* keep statistics ticking */
 	iwl_mvm_accu_radio_stats(mvm);
@@ -1868,6 +1869,9 @@ static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
 		iwl_mvm_bt_coex_vif_change(mvm);
 		iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT,
 				    IEEE80211_SMPS_AUTOMATIC);
+		if (fw_has_capa(&mvm->fw->ucode_capa,
+				IWL_UCODE_TLV_CAPA_UMAC_SCAN))
+			iwl_mvm_config_scan(mvm);
 	} else if (changes & BSS_CHANGED_BEACON_INFO) {
 		/*
 		 * We received a beacon _after_ association so

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

@@ -475,6 +475,14 @@ enum iwl_scan_status {
 	IWL_MVM_SCAN_MASK		= 0xff,
 };
 
+enum iwl_mvm_scan_type {
+	IWL_SCAN_TYPE_NOT_SET,
+	IWL_SCAN_TYPE_UNASSOC,
+	IWL_SCAN_TYPE_WILD,
+	IWL_SCAN_TYPE_MILD,
+	IWL_SCAN_TYPE_FRAGMENTED,
+};
+
 /**
  * struct iwl_nvm_section - describes an NVM section in memory.
  *
@@ -643,7 +651,7 @@ struct iwl_mvm {
 	unsigned int scan_status;
 	void *scan_cmd;
 	struct iwl_mcast_filter_cmd *mcast_filter_cmd;
-	bool scan_fragmented;
+	enum iwl_mvm_scan_type scan_type;
 
 	/* max number of simultaneous scans the FW supports */
 	unsigned int max_scans;

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

@@ -72,13 +72,6 @@
 #define IWL_DENSE_EBS_SCAN_RATIO 5
 #define IWL_SPARSE_EBS_SCAN_RATIO 1
 
-enum iwl_mvm_scan_type {
-	IWL_SCAN_TYPE_UNASSOC,
-	IWL_SCAN_TYPE_WILD,
-	IWL_SCAN_TYPE_MILD,
-	IWL_SCAN_TYPE_FRAGMENTED,
-};
-
 enum iwl_mvm_traffic_load {
 	IWL_MVM_TRAFFIC_LOW,
 	IWL_MVM_TRAFFIC_MEDIUM,
@@ -206,9 +199,7 @@ static enum iwl_mvm_traffic_load iwl_mvm_get_traffic_load(struct iwl_mvm *mvm)
 }
 
 static enum
-iwl_mvm_scan_type iwl_mvm_get_scan_type(struct iwl_mvm *mvm,
-					struct ieee80211_vif *vif,
-					struct iwl_mvm_scan_params *params)
+iwl_mvm_scan_type iwl_mvm_get_scan_type(struct iwl_mvm *mvm, bool p2p_device)
 {
 	int global_cnt = 0;
 	enum iwl_mvm_traffic_load load;
@@ -224,8 +215,7 @@ iwl_mvm_scan_type iwl_mvm_get_scan_type(struct iwl_mvm *mvm,
 	load = iwl_mvm_get_traffic_load(mvm);
 	low_latency = iwl_mvm_low_latency(mvm);
 
-	if ((load == IWL_MVM_TRAFFIC_HIGH || low_latency) &&
-	    vif->type != NL80211_IFTYPE_P2P_DEVICE &&
+	if ((load == IWL_MVM_TRAFFIC_HIGH || low_latency) && !p2p_device &&
 	    fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_FRAGMENTED_SCAN))
 		return IWL_SCAN_TYPE_FRAGMENTED;
 
@@ -917,18 +907,20 @@ int iwl_mvm_config_scan(struct iwl_mvm *mvm)
 	struct iwl_host_cmd cmd = {
 		.id = iwl_cmd_id(SCAN_CFG_CMD, IWL_ALWAYS_LONG_GROUP, 0),
 	};
+	enum iwl_mvm_scan_type type = iwl_mvm_get_scan_type(mvm, false);
 
 	if (WARN_ON(num_channels > mvm->fw->ucode_capa.n_scan_channels))
 		return -ENOBUFS;
 
+	if (type == mvm->scan_type)
+		return 0;
+
 	cmd_size = sizeof(*scan_config) + mvm->fw->ucode_capa.n_scan_channels;
 
 	scan_config = kzalloc(cmd_size, GFP_KERNEL);
 	if (!scan_config)
 		return -ENOMEM;
 
-	mvm->scan_fragmented = iwl_mvm_low_latency(mvm);
-
 	scan_config->flags = cpu_to_le32(SCAN_CONFIG_FLAG_ACTIVATE |
 					 SCAN_CONFIG_FLAG_ALLOW_CHUB_REQS |
 					 SCAN_CONFIG_FLAG_SET_TX_CHAINS |
@@ -938,17 +930,18 @@ int iwl_mvm_config_scan(struct iwl_mvm *mvm)
 					 SCAN_CONFIG_FLAG_SET_MAC_ADDR |
 					 SCAN_CONFIG_FLAG_SET_CHANNEL_FLAGS|
 					 SCAN_CONFIG_N_CHANNELS(num_channels) |
-					 (mvm->scan_fragmented ?
+					 (type == IWL_SCAN_TYPE_FRAGMENTED ?
 					  SCAN_CONFIG_FLAG_SET_FRAGMENTED :
 					  SCAN_CONFIG_FLAG_CLEAR_FRAGMENTED));
 	scan_config->tx_chains = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
 	scan_config->rx_chains = cpu_to_le32(iwl_mvm_scan_rx_ant(mvm));
 	scan_config->legacy_rates = iwl_mvm_scan_config_rates(mvm);
-	scan_config->out_of_channel_time = cpu_to_le32(170);
-	scan_config->suspend_time = cpu_to_le32(30);
-	scan_config->dwell_active = 20;
-	scan_config->dwell_passive = 110;
-	scan_config->dwell_fragmented = 20;
+	scan_config->out_of_channel_time =
+		cpu_to_le32(scan_timing[type].max_out_time);
+	scan_config->suspend_time = cpu_to_le32(scan_timing[type].suspend_time);
+	scan_config->dwell_active = scan_timing[type].dwell_active;
+	scan_config->dwell_passive = scan_timing[type].dwell_passive;
+	scan_config->dwell_fragmented = scan_timing[type].dwell_fragmented;
 
 	memcpy(&scan_config->mac_addr, &mvm->addresses[0].addr, ETH_ALEN);
 
@@ -972,6 +965,8 @@ int iwl_mvm_config_scan(struct iwl_mvm *mvm)
 	IWL_DEBUG_SCAN(mvm, "Sending UMAC scan config\n");
 
 	ret = iwl_mvm_send_cmd(mvm, &cmd);
+	if (!ret)
+		mvm->scan_type = type;
 
 	kfree(scan_config);
 	return ret;
@@ -1225,7 +1220,9 @@ int iwl_mvm_reg_scan_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 	params.scan_plans = &scan_plan;
 	params.n_scan_plans = 1;
 
-	params.type = iwl_mvm_get_scan_type(mvm, vif, &params);
+	params.type =
+		iwl_mvm_get_scan_type(mvm,
+				      vif->type == NL80211_IFTYPE_P2P_DEVICE);
 
 	iwl_mvm_build_scan_probe(mvm, vif, ies, &params);
 
@@ -1307,7 +1304,9 @@ int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
 	params.n_scan_plans = req->n_scan_plans;
 	params.scan_plans = req->scan_plans;
 
-	params.type = iwl_mvm_get_scan_type(mvm, vif, &params);
+	params.type =
+		iwl_mvm_get_scan_type(mvm,
+				      vif->type == NL80211_IFTYPE_P2P_DEVICE);
 
 	/* In theory, LMAC scans can handle a 32-bit delay, but since
 	 * waiting for over 18 hours to start the scan is a bit silly