mac80211_hwsim: fix tsf adjustment

Make hwsim TSF offset adjustments cumulative and relative
to the fake PHY TSF. Now adding 1000us, then adding -1000us
doesn't result in a tsf_offset of -1000. Also the beacon
timestamp can now correctly be expressed as (tsf +
data->tsf_offset), which will be done in a later patch.

Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index d248a4cc6656..807d713414f8 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -361,7 +361,7 @@ struct mac80211_hwsim_data {
         int power_level;
 
         /* difference between this hw's clock and the real clock, in usecs */
-        u64 tsf_offset;
+        s64 tsf_offset;
 };
 
 
@@ -427,9 +427,10 @@ static void mac80211_hwsim_set_tsf(struct ieee80211_hw *hw,
                 struct ieee80211_vif *vif, u64 tsf)
 {
         struct mac80211_hwsim_data *data = hw->priv;
-        struct timeval tv = ktime_to_timeval(ktime_get_real());
-        u64 now = tv.tv_sec * USEC_PER_SEC + tv.tv_usec;
-        data->tsf_offset = tsf - now;
+        u64 now = mac80211_hwsim_get_tsf(hw, vif);
+        s64 delta = tsf - now;
+
+        data->tsf_offset += delta;
 }
 
 static void mac80211_hwsim_monitor_rx(struct ieee80211_hw *hw,