iwlwifi: mvm: expose device timestamp in radiotap

Set the relevant fields to export the 32-bit device timestamp to
radiotap using the new mac80211 infrastructure. This will be useful
to allow synchronising monitor captures taken on different hardware
simultaneously.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 45122dafe9226278abed80ebcba6cd5b49b19f4c..039cb2ad2d3e3cfca341ed0610d87dd2aef4cdf3 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -463,6 +463,13 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
                                    IEEE80211_RADIOTAP_MCS_HAVE_STBC;
        hw->radiotap_vht_details |= IEEE80211_RADIOTAP_VHT_KNOWN_STBC |
                IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED;
+
+       hw->radiotap_timestamp.units_pos =
+               IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US |
+               IEEE80211_RADIOTAP_TIMESTAMP_SPOS_PLCP_SIG_ACQ;
+       /* this is the case for CCK frames, it's better (only 8) for OFDM */
+       hw->radiotap_timestamp.accuracy = 22;
+
        hw->rate_control_algorithm = "iwl-mvm-rs";
        hw->uapsd_queues = IWL_MVM_UAPSD_QUEUES;
        hw->uapsd_max_sp_len = IWL_UAPSD_MAX_SP;