Commit 2ecc3905 authored by Alexander Bondar's avatar Alexander Bondar Committed by Johannes Berg
Browse files

mac80211: Update beacon's timing and DTIM count on every beacon 



Beacon's timestamp, device system time associated with this beacon and
DTIM count parameters are not updated in the associated vif context
if the latest beacon's content is identical to the previously received.
It make sense to update these changing parameters on every beacon so the
driver can get most updated values. This may be necessary, for example,
to avoid either beacons' drift effect or device time stamp overrun.
IMPORTANT: Three sync_* parameters - sync_ts, sync_device_ts and
sync_dtim_count would possibly be out of sync by the time the driver will
use them. The synchronized view is currently guaranteed only in certain
callbacks.

Signed-off-by: default avatarAlexander Bondar <alexander.bondar@intel.com>
Signed-off-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 5fc74329

include/net/mac80211.h

+5 −2
Original line number Diff line number Diff line
@@ -337,12 +337,15 @@ enum ieee80211_rssi_event { 
 *	HW flag %IEEE80211_HW_TIMING_BEACON_ONLY is set, then this can

 *	only come from a beacon, but might not become valid until after

 *	association when a beacon is received (which is notified with the

 *	%BSS_CHANGED_DTIM flag.)

 *	%BSS_CHANGED_DTIM flag.). See also sync_dtim_count important notice.

 * @sync_device_ts: the device timestamp corresponding to the sync_tsf,

 *	the driver/device can use this to calculate synchronisation

 *	(see @sync_tsf)

 *	(see @sync_tsf). See also sync_dtim_count important notice.

 * @sync_dtim_count: Only valid when %IEEE80211_HW_TIMING_BEACON_ONLY

 *	is requested, see @sync_tsf/@sync_device_ts.

 *	IMPORTANT: These three sync_* parameters would possibly be out of sync

 *	by the time the driver will use them. The synchronized view is currently

 *	guaranteed only in certain callbacks.

 * @beacon_int: beacon interval

 * @assoc_capability: capabilities taken from assoc resp

 * @basic_rates: bitmap of basic rates, each bit stands for an

net/mac80211/mlme.c

+20 −12
Original line number Diff line number Diff line
@@ -3419,6 +3419,26 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 
	if (ifmgd->csa_waiting_bcn)

		ieee80211_chswitch_post_beacon(sdata);



	/*

	 * Update beacon timing and dtim count on every beacon appearance. This

	 * will allow the driver to use the most updated values. Do it before

	 * comparing this one with last received beacon.

	 * IMPORTANT: These parameters would possibly be out of sync by the time

	 * the driver will use them. The synchronized view is currently

	 * guaranteed only in certain callbacks.

	 */

	if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {

		sdata->vif.bss_conf.sync_tsf =

			le64_to_cpu(mgmt->u.beacon.timestamp);

		sdata->vif.bss_conf.sync_device_ts =

			rx_status->device_timestamp;

		if (elems.tim)

			sdata->vif.bss_conf.sync_dtim_count =

				elems.tim->dtim_count;

		else

			sdata->vif.bss_conf.sync_dtim_count = 0;

	}



	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)

		return;

	ifmgd->beacon_crc = ncrc;
@@ -3446,18 +3466,6 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata, 
		else

			bss_conf->dtim_period = 1;



		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {

			sdata->vif.bss_conf.sync_tsf =

				le64_to_cpu(mgmt->u.beacon.timestamp);

			sdata->vif.bss_conf.sync_device_ts =

				rx_status->device_timestamp;

			if (elems.tim)

				sdata->vif.bss_conf.sync_dtim_count =

					elems.tim->dtim_count;

			else

				sdata->vif.bss_conf.sync_dtim_count = 0;

		}



		changed |= BSS_CHANGED_BEACON_INFO;

		ifmgd->have_beacon = true;

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