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197 lines
5.9 KiB
197 lines
5.9 KiB
Index: madwifi-ng-r2568-20070710/ath/if_ath.c
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===================================================================
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--- madwifi-ng-r2568-20070710.orig/ath/if_ath.c 2007-07-11 22:59:41.856233797 +0200
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+++ madwifi-ng-r2568-20070710/ath/if_ath.c 2007-07-11 22:59:42.416265710 +0200
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@@ -4426,16 +4426,31 @@
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struct ieee80211com *ic = &sc->sc_ic;
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struct ath_hal *ah = sc->sc_ah;
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struct ieee80211_node *ni;
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- u_int32_t nexttbtt, intval;
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+ u_int32_t nexttbtt = 0;
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+ u_int32_t intval;
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+ u_int64_t tsf, hw_tsf;
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+ u_int32_t tsftu, hw_tsftu;
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+ int should_reset_tsf = 0;
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if (vap == NULL)
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vap = TAILQ_FIRST(&ic->ic_vaps); /* XXX */
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ni = vap->iv_bss;
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- /* extract tstamp from last beacon and convert to TU */
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- nexttbtt = TSF_TO_TU(LE_READ_4(ni->ni_tstamp.data + 4),
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- LE_READ_4(ni->ni_tstamp.data));
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+ hw_tsf = ath_hal_gettsf64(ah);
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+ tsf = le64_to_cpu(ni->ni_tstamp.tsf);
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+ hw_tsftu = hw_tsf >> 10;
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+ tsftu = tsf >> 10;
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+
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+ /* we should reset hw TSF only once, so we increment
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+ ni_tstamp.tsf to avoid resetting the hw TSF multiple
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+ times */
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+
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+ if (tsf == 0) {
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+ should_reset_tsf = 1;
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+ ni->ni_tstamp.tsf = cpu_to_le64(1);
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+ }
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+
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/* XXX conditionalize multi-bss support? */
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if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
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/*
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@@ -4449,20 +4464,61 @@
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if (sc->sc_stagbeacons)
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intval /= ATH_BCBUF; /* for staggered beacons */
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if ((sc->sc_nostabeacons) &&
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- (vap->iv_opmode == IEEE80211_M_HOSTAP))
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- nexttbtt = 0;
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+ (vap->iv_opmode == IEEE80211_M_HOSTAP))
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+ should_reset_tsf = 1;
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} else
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intval = ni->ni_intval & HAL_BEACON_PERIOD;
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- if (nexttbtt == 0) /* e.g. for ap mode */
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+
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+#define FUDGE 2
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+ sc->sc_syncbeacon = 0;
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+ if (should_reset_tsf) {
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+
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+ /* We just created the interface and TSF will be reset to
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+ zero, so next beacon will be sent at the next intval
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+ time */
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+
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nexttbtt = intval;
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- else if (intval) /* NB: can be 0 for monitor mode */
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- nexttbtt = roundup(nexttbtt, intval);
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- DPRINTF(sc, ATH_DEBUG_BEACON, "%s: nexttbtt %u intval %u (%u)\n",
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- __func__, nexttbtt, intval, ni->ni_intval);
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+ } else if (intval) { /* NB: can be 0 for monitor mode */
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+ if (tsf == 1) {
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+
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+ /* We do not receive any beacons or probe response. Since
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+ a beacon should be sent every 'intval' ms, we compute
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+ the next beacon timestamp using the hardware TSF. We
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+ ensure that it is at least FUDGE ms ahead of the
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+ current TSF. Otherwise, we use the next beacon
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+ timestamp again */
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+
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+ nexttbtt = roundup(hw_tsftu +1, intval);
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+ while (nexttbtt <= hw_tsftu + FUDGE) {
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+ nexttbtt += intval;
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+ }
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+ } else {
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+ if (tsf > hw_tsf) {
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+
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+ /* We do receive a beacon from someone else in the past,
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+ but the hw TSF has not been updated (otherwise we
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+ would have tsf >= hw_tsf). Since we cannot use the
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+ hardware TSF, we will do nothing and wait for the
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+ next beacon. In order to do so, we set sc->syncbeacon
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+ again */
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+
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+ sc->sc_syncbeacon = 1;
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+ goto ath_beacon_config_debug;
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+ } else {
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+ /* We do receive a beacon in the past, normal case. We
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+ make sure that the timestamp is at least FUDGE ms
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+ ahead of the hardware TSF */
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+
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+ nexttbtt = tsftu + intval;
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+ while (nexttbtt <= hw_tsftu + FUDGE) {
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+ nexttbtt += intval;
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+ }
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+ }
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+ }
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+ }
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+
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if (ic->ic_opmode == IEEE80211_M_STA && !(sc->sc_nostabeacons)) {
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HAL_BEACON_STATE bs;
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- u_int64_t tsf;
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- u_int32_t tsftu;
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int dtimperiod, dtimcount;
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int cfpperiod, cfpcount;
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@@ -4478,13 +4534,13 @@
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dtimcount = 0; /* XXX? */
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cfpperiod = 1; /* NB: no PCF support yet */
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cfpcount = 0;
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-#define FUDGE 2
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/*
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* Pull nexttbtt forward to reflect the current
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* TSF and calculate dtim+cfp state for the result.
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*/
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- tsf = ath_hal_gettsf64(ah);
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- tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
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+ nexttbtt = tsftu;
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+ if (nexttbtt == 0) /* e.g. for ap mode */
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+ nexttbtt = intval;
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do {
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nexttbtt += intval;
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if (--dtimcount < 0) {
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@@ -4492,7 +4548,7 @@
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if (--cfpcount < 0)
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cfpcount = cfpperiod - 1;
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}
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- } while (nexttbtt < tsftu);
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+ } while (nexttbtt < hw_tsftu + FUDGE);
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#undef FUDGE
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memset(&bs, 0, sizeof(bs));
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bs.bs_intval = intval;
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@@ -4544,7 +4600,7 @@
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DPRINTF(sc, ATH_DEBUG_BEACON,
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"%s: tsf %llu tsf:tu %u intval %u nexttbtt %u dtim %u nextdtim %u bmiss %u sleep %u cfp:period %u maxdur %u next %u timoffset %u\n",
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__func__,
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- (unsigned long long) tsf, tsftu,
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+ (unsigned long long) hw_tsf, hw_tsftu,
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bs.bs_intval,
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bs.bs_nexttbtt,
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bs.bs_dtimperiod,
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@@ -4566,7 +4622,7 @@
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ath_hal_intrset(ah, sc->sc_imask);
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} else {
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ath_hal_intrset(ah, 0);
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- if (nexttbtt == intval)
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+ if (should_reset_tsf)
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intval |= HAL_BEACON_RESET_TSF;
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if (ic->ic_opmode == IEEE80211_M_IBSS) {
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/*
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@@ -4603,8 +4659,40 @@
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if (ic->ic_opmode == IEEE80211_M_IBSS && sc->sc_hasveol)
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ath_beacon_start_adhoc(sc, vap);
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}
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- sc->sc_syncbeacon = 0;
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#undef TSF_TO_TU
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+
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+ ath_beacon_config_debug:
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+
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+ /* we print all debug messages here, in order to preserve the
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+ time critical aspect of this function */
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+
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+ DPRINTF(sc, ATH_DEBUG_BEACON,
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+ "%s: ni=%p tsf=%llu hw_tsf=%llu tsftu=%u hw_tsftu=%u\n",
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+ __func__, ni, tsf, hw_tsf, tsftu, hw_tsftu);
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+
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+ if (should_reset_tsf) {
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+ /* we just created the interface */
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+ DPRINTF(sc, ATH_DEBUG_BEACON, "%s: first beacon\n",__func__);
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+ } else {
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+ if (tsf == 1) {
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+ /* we do not receive any beacons or probe response */
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+ DPRINTF(sc, ATH_DEBUG_BEACON,
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+ "%s: no beacon received...\n",__func__);
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+ } else {
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+ if (tsf > hw_tsf) {
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+ /* we do receive a beacon and the hw TSF has not been updated */
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+ DPRINTF(sc, ATH_DEBUG_BEACON,
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+ "%s: beacon received, but TSF is incorrect\n",__func__);
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+ } else {
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+ /* we do receive a beacon in the past, normal case */
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+ DPRINTF(sc, ATH_DEBUG_BEACON,
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+ "%s: beacon received, TSF is correct\n",__func__);
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+ }
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+ }
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+ }
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+
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+ DPRINTF(sc, ATH_DEBUG_BEACON, "%s: nexttbtt=%u intval=%u\n",
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+ __func__,nexttbtt, intval & HAL_BEACON_PERIOD);
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}
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static int
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