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extend the timestamp from the rx descriptor to calculate the tsf to

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use when checking for an ibss merge
This commit is contained in:
Sam Leffler 2005-03-29 22:16:49 +00:00
parent 019b966921
commit 03ed599a2a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=144309
1 changed files with 24 additions and 7 deletions
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31
sys/dev/ath/if_ath.c
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@ -2417,6 +2417,21 @@ ath_rxbuf_init(struct ath_softc *sc, struct ath_buf *bf)
return 0;
}
/*
* Extend 15-bit time stamp from rx descriptor to
* a full 64-bit TSF using the current h/w TSF.
*/
static __inline u_int64_t
ath_extend_tsf(struct ath_hal *ah, u_int32_t rstamp)
{
u_int64_t tsf;
tsf = ath_hal_gettsf64(ah);
if ((tsf & 0x7fff) < rstamp)
tsf -= 0x8000;
return ((tsf &~ 0x7fff) | rstamp);
}
/*
* Intercept management frames to collect beacon rssi data
* and to do ibss merges.
@ -2441,10 +2456,7 @@ ath_recv_mgmt(struct ieee80211com *ic, struct mbuf *m,
case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
if (ic->ic_opmode == IEEE80211_M_IBSS &&
ic->ic_state == IEEE80211_S_RUN) {
struct ath_hal *ah = sc->sc_ah;
/* XXX extend rstamp */
u_int64_t tsf = ath_hal_gettsf64(ah);
u_int64_t tsf = ath_extend_tsf(sc->sc_ah, rstamp);
/*
* Handle ibss merge as needed; check the tsf on the
* frame before attempting the merge. The 802.11 spec
@ -2452,11 +2464,16 @@ ath_recv_mgmt(struct ieee80211com *ic, struct mbuf *m,
* the oldest station with the same ssid, where oldest
* is determined by the tsf. Note that hardware
* reconfiguration happens through callback to
* ath_newstate as the state machine will be go
* from RUN -> RUN when this happens.
* ath_newstate as the state machine will go from
* RUN -> RUN when this happens.
*/
if (le64toh(ni->ni_tstamp.tsf) >= tsf)
if (le64toh(ni->ni_tstamp.tsf) >= tsf) {
DPRINTF(sc, ATH_DEBUG_STATE,
"ibss merge, rstamp %u tsf %llu "
"tstamp %llu\n", rstamp, tsf,
ni->ni_tstamp.tsf);
(void) ieee80211_ibss_merge(ic, ni);
}
}
break;
}