wifi: iwlwifi: mvm: support enabling and disabling HW timestamping

Instead of enabling HW timestamping by default every time a station
is connected, disable it by default and enable it only upon request
for a specific station. HW timestamping can be enabled for only one
peer at a time.
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230320122330.62b98fbf545b.I450c1017ada7900a71a63d879bb542a08e3166c8@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

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

@@ -21,6 +21,7 @@
 #include "iwl-phy-db.h"
 #include "iwl-modparams.h"
 #include "iwl-nvm-parse.h"
+#include "time-sync.h"
 
 #define MVM_UCODE_ALIVE_TIMEOUT	(HZ)
 #define MVM_UCODE_CALIB_TIMEOUT	(2 * HZ)
@@ -1666,8 +1667,12 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
 			goto error;
 	}
 
-	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
+	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
 		iwl_mvm_send_recovery_cmd(mvm, ERROR_RECOVERY_UPDATE_DB);
+		iwl_mvm_time_sync_config(mvm, mvm->time_sync.peer_addr,
+					 IWL_TIME_SYNC_PROTOCOL_TM |
+					 IWL_TIME_SYNC_PROTOCOL_FTM);
+	}
 
 	if (!mvm->ptp_data.ptp_clock)
 		iwl_mvm_ptp_init(mvm);

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

@@ -28,6 +28,7 @@
 #include "fw/error-dump.h"
 #include "iwl-prph.h"
 #include "iwl-nvm-parse.h"
+#include "time-sync.h"
 
 static const struct ieee80211_iface_limit iwl_mvm_limits[] = {
 	{
@@ -416,6 +417,10 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
 		wiphy_ext_feature_set(hw->wiphy,
 				      NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT);
 
+	if (fw_has_capa(&mvm->fw->ucode_capa,
+			IWL_UCODE_TLV_CAPA_TIME_SYNC_BOTH_FTM_TM))
+		hw->wiphy->hw_timestamp_max_peers = 1;
+
 	ieee80211_hw_set(hw, SINGLE_SCAN_ON_ALL_BANDS);
 	hw->wiphy->features |=
 		NL80211_FEATURE_SCHED_SCAN_RANDOM_MAC_ADDR |
@@ -5765,6 +5770,29 @@ static bool iwl_mvm_mac_can_aggregate(struct ieee80211_hw *hw,
 	return iwl_mvm_can_hw_csum(skb) == iwl_mvm_can_hw_csum(head);
 }
 
+static int iwl_mvm_set_hw_timestamp(struct ieee80211_hw *hw,
+				    struct ieee80211_vif *vif,
+				    struct cfg80211_set_hw_timestamp *hwts)
+{
+	struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
+	u32 protocols = 0;
+	int ret;
+
+	/* HW timestamping is only supported for a specific station */
+	if (!hwts->macaddr)
+		return -EOPNOTSUPP;
+
+	if (hwts->enable)
+		protocols =
+			IWL_TIME_SYNC_PROTOCOL_TM | IWL_TIME_SYNC_PROTOCOL_FTM;
+
+	mutex_lock(&mvm->mutex);
+	ret = iwl_mvm_time_sync_config(mvm, hwts->macaddr, protocols);
+	mutex_unlock(&mvm->mutex);
+
+	return ret;
+}
+
 const struct ieee80211_ops iwl_mvm_hw_ops = {
 	.tx = iwl_mvm_mac_tx,
 	.wake_tx_queue = iwl_mvm_mac_wake_tx_queue,
@@ -5853,4 +5881,5 @@ const struct ieee80211_ops iwl_mvm_hw_ops = {
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 	.sta_add_debugfs = iwl_mvm_sta_add_debugfs,
 #endif
+	.set_hw_timestamp = iwl_mvm_set_hw_timestamp,
 };

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

@@ -9,7 +9,6 @@
 #include "mvm.h"
 #include "sta.h"
 #include "rs.h"
-#include "time-sync.h"
 
 /*
  * New version of ADD_STA_sta command added new fields at the end of the
@@ -1793,11 +1792,6 @@ int iwl_mvm_add_sta(struct iwl_mvm *mvm,
 		}
 	}
 
-	if (!sta->tdls)
-		iwl_mvm_time_sync_config(mvm, sta->addr,
-					 IWL_TIME_SYNC_PROTOCOL_TM |
-					 IWL_TIME_SYNC_PROTOCOL_FTM);
-
 	rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id], sta);
 
 	return 0;
@@ -1987,8 +1981,6 @@ static bool iwl_mvm_sta_del(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 	spin_lock_bh(&mvm_sta->lock);
 	spin_unlock_bh(&mvm_sta->lock);
 
-	iwl_mvm_time_sync_sta_rm(mvm, sta);
-
 	return false;
 }
 

drivers/net/wireless/intel/iwlwifi/mvm/time-sync.c

@@ -125,7 +125,7 @@ void iwl_mvm_time_sync_msmt_confirm_event(struct iwl_mvm *mvm,
 	ieee80211_tx_status_ext(mvm->hw, &status);
 }
 
-int iwl_mvm_time_sync_config(struct iwl_mvm *mvm, u8 *addr, u32 protocols)
+int iwl_mvm_time_sync_config(struct iwl_mvm *mvm, const u8 *addr, u32 protocols)
 {
 	struct iwl_time_sync_cfg_cmd cmd = {};
 	int err;
@@ -166,13 +166,8 @@ int iwl_mvm_time_sync_config(struct iwl_mvm *mvm, u8 *addr, u32 protocols)
 		IWL_DEBUG_INFO(mvm, "Time sync: set peer addr=%pM\n", addr);
 	}
 
-	return err;
-}
+	if (!mvm->time_sync.active)
+		skb_queue_purge(&mvm->time_sync.frame_list);
 
-void iwl_mvm_time_sync_sta_rm(struct iwl_mvm *mvm, struct ieee80211_sta *sta)
-{
-	/* Disable time sync with this station */
-	iwl_mvm_time_sync_config(mvm, sta->addr, 0);
-
-	skb_queue_purge(&mvm->time_sync.frame_list);
+	return err;
 }

drivers/net/wireless/intel/iwlwifi/mvm/time-sync.h

@@ -13,8 +13,8 @@ void iwl_mvm_time_sync_msmt_event(struct iwl_mvm *mvm,
 				  struct iwl_rx_cmd_buffer *rxb);
 void iwl_mvm_time_sync_msmt_confirm_event(struct iwl_mvm *mvm,
 					  struct iwl_rx_cmd_buffer *rxb);
-int iwl_mvm_time_sync_config(struct iwl_mvm *mvm, u8 *addr, u32 protocols);
-void iwl_mvm_time_sync_sta_rm(struct iwl_mvm *mvm, struct ieee80211_sta *sta);
+int iwl_mvm_time_sync_config(struct iwl_mvm *mvm, const u8 *addr,
+			     u32 protocols);
 
 static inline
 bool iwl_mvm_time_sync_frame(struct iwl_mvm *mvm, struct sk_buff *skb, u8 *addr)

intc-scripts/chromeOS/adjustments/024-time-sync.spatch

+@@
+struct ieee80211_hw *hw;
+expression val;
+@@
+-hw->wiphy->hw_timestamp_max_peers = val
++hw_timestamp_max_peers(hw)