iwlwifi: mvm: add adaptive dwell support

Update the scan command API with support for adaptive dwell.  Adaptive
dwell is a type of scan that dynamically changes the time it remains
on each channel listening for beacons or probe responses.
Signed-off-by: Roee Zamir <roee.zamir@intel.com>
Signed-off-by: Beni Lev <beni.lev@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

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

@@ -110,6 +110,8 @@
 #define IWL_MVM_SW_TX_CSUM_OFFLOAD		0
 #define IWL_MVM_HW_CSUM_DISABLE			0
 #define IWL_MVM_PARSE_NVM			0
+#define IWL_MVM_ADWELL_ENABLE			1
+#define IWL_MVM_ADWELL_MAX_BUDGET		0
 #define IWL_MVM_RS_NUM_TRY_BEFORE_ANT_TOGGLE    1
 #define IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE      2
 #define IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE_TW   1

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

@@ -86,6 +86,15 @@ enum iwl_mvm_traffic_load {
 #define IWL_SCAN_DWELL_FRAGMENTED	44
 #define IWL_SCAN_DWELL_EXTENDED		90
 
+/* adaptive dwell max budget time [TU] for full scan */
+#define IWL_SCAN_ADWELL_MAX_BUDGET_FULL_SCAN 300
+/* adaptive dwell max budget time [TU] for directed scan */
+#define IWL_SCAN_ADWELL_MAX_BUDGET_DIRECTED_SCAN 100
+/* adaptive dwell default APs number */
+#define IWL_SCAN_ADWELL_DEFAULT_N_APS 2
+/* adaptive dwell default APs number in social channels (1, 6, 11) */
+#define IWL_SCAN_ADWELL_DEFAULT_N_APS_SOCIAL 10
+
 struct iwl_mvm_scan_timing_params {
 	u32 suspend_time;
 	u32 max_out_time;
@@ -1115,11 +1124,6 @@ static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
 {
 	struct iwl_mvm_scan_timing_params *timing = &scan_timing[params->type];
 
-	if (iwl_mvm_is_regular_scan(params))
-		cmd->ooc_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
-	else
-		cmd->ooc_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_2);
-
 	if (iwl_mvm_is_adaptive_dwell_supported(mvm)) {
 		if (params->measurement_dwell) {
 			cmd->v7.active_dwell = params->measurement_dwell;
@@ -1129,6 +1133,21 @@ static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
 			cmd->v7.passive_dwell = IWL_SCAN_DWELL_PASSIVE;
 		}
 		cmd->v7.fragmented_dwell = IWL_SCAN_DWELL_FRAGMENTED;
+		cmd->v7.adwell_default_n_aps_social =
+			IWL_SCAN_ADWELL_DEFAULT_N_APS_SOCIAL;
+		cmd->v7.adwell_default_n_aps =
+			IWL_SCAN_ADWELL_DEFAULT_N_APS;
+
+		/* if custom max budget was configured with debugfs */
+		if (IWL_MVM_ADWELL_MAX_BUDGET)
+			cmd->v7.adwell_max_budget =
+				cpu_to_le16(IWL_MVM_ADWELL_MAX_BUDGET);
+		else if (params->ssids && params->ssids[0].ssid_len)
+			cmd->v7.adwell_max_budget =
+				cpu_to_le16(IWL_SCAN_ADWELL_MAX_BUDGET_DIRECTED_SCAN);
+		else
+			cmd->v7.adwell_max_budget =
+				cpu_to_le16(IWL_SCAN_ADWELL_MAX_BUDGET_FULL_SCAN);
 
 		cmd->v7.scan_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
 		cmd->v7.max_out_time[SCAN_LB_LMAC_IDX] =
@@ -1136,15 +1155,12 @@ static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
 		cmd->v7.suspend_time[SCAN_LB_LMAC_IDX] =
 			cpu_to_le32(timing->suspend_time);
 		if (iwl_mvm_is_cdb_supported(mvm)) {
-			cmd->v7.max_out_time[SCAN_HB_LMAC_IDX] =
+			cmd->v6.max_out_time[SCAN_HB_LMAC_IDX] =
 				cpu_to_le32(timing->max_out_time);
-			cmd->v7.suspend_time[SCAN_HB_LMAC_IDX] =
+			cmd->v6.suspend_time[SCAN_HB_LMAC_IDX] =
 				cpu_to_le32(timing->suspend_time);
 		}
-
-		return;
-	}
-
+	} else {
 		if (params->measurement_dwell) {
 			cmd->v1.active_dwell = params->measurement_dwell;
 			cmd->v1.passive_dwell = params->measurement_dwell;
@@ -1155,24 +1171,31 @@ static void iwl_mvm_scan_umac_dwell(struct iwl_mvm *mvm,
 			cmd->v1.extended_dwell = IWL_SCAN_DWELL_EXTENDED;
 		}
 		cmd->v1.fragmented_dwell = IWL_SCAN_DWELL_FRAGMENTED;
+		if (iwl_mvm_is_cdb_supported(mvm)) {
+			struct iwl_mvm_scan_timing_params *hb_timing =
+				&scan_timing[params->type];
+
+			cmd->v6.max_out_time[SCAN_HB_LMAC_IDX] =
+					cpu_to_le32(hb_timing->max_out_time);
+			cmd->v6.suspend_time[SCAN_HB_LMAC_IDX] =
+					cpu_to_le32(hb_timing->suspend_time);
+		}
 
 		if (iwl_mvm_has_new_tx_api(mvm)) {
-		cmd->v6.scan_priority = cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
+			cmd->v6.scan_priority =
+				cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
 			cmd->v6.max_out_time[SCAN_LB_LMAC_IDX] =
 				cpu_to_le32(timing->max_out_time);
 			cmd->v6.suspend_time[SCAN_LB_LMAC_IDX] =
 				cpu_to_le32(timing->suspend_time);
-		if (iwl_mvm_is_cdb_supported(mvm)) {
-			cmd->v6.max_out_time[SCAN_HB_LMAC_IDX] =
-				cpu_to_le32(timing->max_out_time);
-			cmd->v6.suspend_time[SCAN_HB_LMAC_IDX] =
-				cpu_to_le32(timing->suspend_time);
-		}
 		} else {
-		cmd->v1.max_out_time = cpu_to_le32(timing->max_out_time);
-		cmd->v1.suspend_time = cpu_to_le32(timing->suspend_time);
 			cmd->v1.scan_priority =
 				cpu_to_le32(IWL_SCAN_PRIORITY_EXT_6);
+			cmd->v1.max_out_time =
+				cpu_to_le32(timing->max_out_time);
+			cmd->v1.suspend_time =
+				cpu_to_le32(timing->suspend_time);
+		}
 	}
 }
 
@@ -1234,6 +1257,15 @@ static u16 iwl_mvm_scan_umac_flags(struct iwl_mvm *mvm,
 	if (mvm->sched_scan_pass_all == SCHED_SCAN_PASS_ALL_ENABLED)
 		flags |= IWL_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE;
 
+	if (iwl_mvm_is_adaptive_dwell_supported(mvm) && IWL_MVM_ADWELL_ENABLE &&
+	    vif->type != NL80211_IFTYPE_P2P_DEVICE)
+		flags |= IWL_UMAC_SCAN_GEN_FLAGS_ADAPTIVE_DWELL;
+
+	/*
+	 * Extended dwell is relevant only for low band to start with, as it is
+	 * being used for social channles only (1, 6, 11), so we can check
+	 * only scan type on low band also for CDB.
+	 */
 	if (iwl_mvm_is_regular_scan(params) &&
 	    vif->type != NL80211_IFTYPE_P2P_DEVICE &&
 	    params->type != IWL_SCAN_TYPE_FRAGMENTED)