iwlwifi: mvm: support beacon storing

Currently firmware is configured to filter out beacons. In case
a beacon was changed - it is waking the host.
However, some vendors change their IEs frequently without any
significant change, and redundant wakeups are triggered as a
result.
As a solution disable beacon filtering when entering d0i3.
Instead, firmware will store the latest beacon and upon exiting
d0i3 it will send it up to the host, so the host can act upon
changes (if there were any).
This beacon will arrive as a dedicated notification - support it
as well.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 19 insertions, 3 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 6bf2bde239a0..3c869ad6aaec 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -33,6 +33,7 @@
  *
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
+ * Copyright(c) 2016 Intel Deutschland GmbH
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -267,6 +268,8 @@ static const struct iwl_rx_handlers iwl_mvm_rx_handlers[] = {
 		   true),
 	RX_HANDLER(MFUART_LOAD_NOTIFICATION, iwl_mvm_rx_mfuart_notif, false),
 	RX_HANDLER(TOF_NOTIFICATION, iwl_mvm_tof_resp_handler, true),
+	RX_HANDLER_GRP(PROT_OFFLOAD_GROUP, STORED_BEACON_NTF,
+		       iwl_mvm_rx_stored_beacon_notif, false),
 
 };
 #undef RX_HANDLER
@@ -386,10 +389,18 @@ static const struct iwl_hcmd_names iwl_mvm_phy_names[] = {
 	HCMD_NAME(DTS_MEASUREMENT_NOTIF_WIDE),
 };
 
+/* Please keep this array *SORTED* by hex value.
+ * Access is done through binary search
+ */
+static const struct iwl_hcmd_names iwl_mvm_prot_offload_names[] = {
+	HCMD_NAME(STORED_BEACON_NTF),
+};
+
 static const struct iwl_hcmd_arr iwl_mvm_groups[] = {
 	[LEGACY_GROUP] = HCMD_ARR(iwl_mvm_legacy_names),
 	[LONG_GROUP] = HCMD_ARR(iwl_mvm_legacy_names),
 	[PHY_OPS_GROUP] = HCMD_ARR(iwl_mvm_phy_names),
+	[PROT_OFFLOAD_GROUP] = HCMD_ARR(iwl_mvm_prot_offload_names),
 };
 
 /* this forward declaration can avoid to export the function */
@@ -1195,7 +1206,7 @@ static void iwl_mvm_set_wowlan_data(struct iwl_mvm *mvm,
 	cmd->is_11n_connection = ap_sta->ht_cap.ht_supported;
 	cmd->offloading_tid = iter_data->offloading_tid;
 	cmd->flags = ENABLE_L3_FILTERING | ENABLE_NBNS_FILTERING |
-		ENABLE_DHCP_FILTERING;
+		ENABLE_DHCP_FILTERING | ENABLE_STORE_BEACON;
 	/*
 	 * The d0i3 uCode takes care of the nonqos counters,
 	 * so configure only the qos seq ones.
@@ -1216,8 +1227,7 @@ int iwl_mvm_enter_d0i3(struct iwl_op_mode *op_mode)
 	struct iwl_wowlan_config_cmd wowlan_config_cmd = {
 		.wakeup_filter = cpu_to_le32(IWL_WOWLAN_WAKEUP_RX_FRAME |
 					     IWL_WOWLAN_WAKEUP_BEACON_MISS |
-					     IWL_WOWLAN_WAKEUP_LINK_CHANGE |
-					     IWL_WOWLAN_WAKEUP_BCN_FILTERING),
+					     IWL_WOWLAN_WAKEUP_LINK_CHANGE),
 	};
 	struct iwl_d3_manager_config d3_cfg_cmd = {
 		.min_sleep_time = cpu_to_le32(1000),
@@ -1267,6 +1277,12 @@ int iwl_mvm_enter_d0i3(struct iwl_op_mode *op_mode)
 
 	/* configure wowlan configuration only if needed */
 	if (mvm->d0i3_ap_sta_id != IWL_MVM_STATION_COUNT) {
+		/* wake on beacons only if beacon storing isn't supported */
+		if (!fw_has_capa(&mvm->fw->ucode_capa,
+				 IWL_UCODE_TLV_CAPA_BEACON_STORING))
+			wowlan_config_cmd.wakeup_filter |=
+				cpu_to_le32(IWL_WOWLAN_WAKEUP_BCN_FILTERING);
+
 		iwl_mvm_wowlan_config_key_params(mvm,
 						 d0i3_iter_data.connected_vif,
 						 true, flags);