openwrt/package/madwifi/patches/448-beacon_handling_fixes.patch

--- a/ath/if_ath.c
+++ b/ath/if_ath.c
@@ -160,7 +160,7 @@ static int ath_check_beacon_done(struct
 static void ath_beacon_send(struct ath_softc *, int *, uint64_t hw_tsf);
 static void ath_beacon_return(struct ath_softc *, struct ath_buf *);
 static void ath_beacon_free(struct ath_softc *);
-static void ath_beacon_config(struct ath_softc *, struct ieee80211vap *);
+static void ath_beacon_config(struct ath_softc *, struct ieee80211vap *, int);
 static void ath_hw_beacon_stop(struct ath_softc *sc);
 static int ath_desc_alloc(struct ath_softc *);
 static void ath_desc_free(struct ath_softc *);
@@ -387,13 +387,11 @@ static void ath_set_timing(struct ath_so
 /* calibrate every 30 secs in steady state but check every second at first. */
 static int ath_calinterval = ATH_SHORT_CALINTERVAL;
 static int ath_xchanmode = AH_TRUE;		/* enable extended channels */
-static int ath_maxvaps = ATH_MAXVAPS_DEFAULT;   /* set default maximum vaps */
 static int bstuck_thresh = BSTUCK_THRESH;       /* Stuck beacon count required for reset */
 static char *autocreate = NULL;
 static char *ratectl = DEF_RATE_CTL;
 static int rfkill = 0;
 static int tpc = 1;
-static int maxvaps = -1;
 static int xchanmode = -1;
 #include "ath_wprobe.c"
 static int beacon_cal = 1;
@@ -432,7 +430,6 @@ static struct notifier_block ath_event_b
 
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,52))
 MODULE_PARM(beacon_cal, "i");
-MODULE_PARM(maxvaps, "i");
 MODULE_PARM(xchanmode, "i");
 MODULE_PARM(rfkill, "i");
 #ifdef ATH_CAP_TPC
@@ -444,7 +441,6 @@ MODULE_PARM(ratectl, "s");
 #else
 #include <linux/moduleparam.h>
 module_param(beacon_cal, int, 0600);
-module_param(maxvaps, int, 0600);
 module_param(xchanmode, int, 0600);
 module_param(rfkill, int, 0600);
 #ifdef ATH_CAP_TPC
@@ -454,7 +450,6 @@ module_param(bstuck_thresh, int, 0600);
 module_param(autocreate, charp, 0600);
 module_param(ratectl, charp, 0600);
 #endif
-MODULE_PARM_DESC(maxvaps, "Maximum VAPs");
 MODULE_PARM_DESC(xchanmode, "Enable/disable extended channel mode");
 MODULE_PARM_DESC(rfkill, "Enable/disable RFKILL capability");
 #ifdef ATH_CAP_TPC
@@ -512,7 +507,7 @@ MODULE_PARM_DESC(ieee80211_debug, "Load-
  * and use the higher bits as the index of the VAP.
  */
 #define ATH_SET_VAP_BSSID_MASK(bssid_mask)				\
-	((bssid_mask)[0] &= ~(((ath_maxvaps-1) << 2) | 0x02))
+	((bssid_mask)[0] &= ~(((ATH_MAXVAPS_BCN-1) << 2) | 0x02))
 #define ATH_GET_VAP_ID(bssid)                   ((bssid)[0] >> 2)
 #define ATH_SET_VAP_BSSID(bssid, id)					\
 		do {							\
@@ -604,8 +599,8 @@ ath_attach(u_int16_t devid, struct net_d
 
 	/* Allocate space for dynamically determined maximum VAP count */
 	sc->sc_bslot = 
-		kmalloc(ath_maxvaps * sizeof(struct ieee80211vap*), GFP_KERNEL);
-	memset(sc->sc_bslot, 0, ath_maxvaps * sizeof(struct ieee80211vap*));
+		kmalloc(ATH_MAXVAPS_BCN * sizeof(struct ieee80211vap*), GFP_KERNEL);
+	memset(sc->sc_bslot, 0, ATH_MAXVAPS_BCN * sizeof(struct ieee80211vap*));
 
 	/*
 	 * Cache line size is used to size and align various
@@ -694,13 +689,6 @@ ath_attach(u_int16_t devid, struct net_d
 	for (i = 0; i < sc->sc_keymax; i++)
 		ath_hal_keyreset(ah, i);
 
-	if (maxvaps != -1) {
-		ath_maxvaps = maxvaps;
-		if (ath_maxvaps < ATH_MAXVAPS_MIN)
-			ath_maxvaps = ATH_MAXVAPS_MIN;
-		else if (ath_maxvaps > ATH_MAXVAPS_MAX)
-			ath_maxvaps = ATH_MAXVAPS_MAX;
-	}
 	if (xchanmode != -1)
 		ath_xchanmode = xchanmode;
 	error = ath_getchannels(dev);
@@ -1349,12 +1337,6 @@ ath_vap_create(struct ieee80211com *ic,
 		return NULL;
 	}
 
-	if (sc->sc_nvaps >= ath_maxvaps) {
-		EPRINTF(sc, "Too many virtual APs (%d already exist).\n", 
-				sc->sc_nvaps);
-		return NULL;
-	}
-
 	dev = alloc_etherdev(sizeof(struct ath_vap) + sc->sc_rc->arc_vap_space);
 	if (dev == NULL) {
 		/* XXX msg */
@@ -1424,7 +1406,7 @@ ath_vap_create(struct ieee80211com *ic,
 		TAILQ_FOREACH(v, &ic->ic_vaps, iv_next)
 			id_mask |= (1 << ATH_GET_VAP_ID(v->iv_myaddr));
 
-		for (id = 0; id < ath_maxvaps; id++) {
+		for (id = 0; id < ATH_MAXVAPS_BCN; id++) {
 			/* get the first available slot */
 			if ((id_mask & (1 << id)) == 0) {
 				ATH_SET_VAP_BSSID(vap->iv_myaddr, id);
@@ -1451,11 +1433,11 @@ ath_vap_create(struct ieee80211com *ic,
 		/* Assign the VAP to a beacon xmit slot.  As
 		 * above, this cannot fail to find one. */
 		avp->av_bslot = 0;
-		for (slot = 0; slot < ath_maxvaps; slot++)
+		for (slot = 0; slot < ATH_MAXVAPS_BCN; slot++)
 			if (sc->sc_bslot[slot] == NULL) {
 				/* XXX: Hack, space out slots to better
 				 * deal with misses. */
-				if (slot + 1 < ath_maxvaps &&
+				if (slot + 1 < ATH_MAXVAPS_BCN &&
 				    sc->sc_bslot[slot+1] == NULL) {
 					avp->av_bslot = slot + 1;
 					break;
@@ -1463,8 +1445,11 @@ ath_vap_create(struct ieee80211com *ic,
 				avp->av_bslot = slot;
 				/* NB: keep looking for a double slot */
 			}
-		KASSERT(sc->sc_bslot[avp->av_bslot] == NULL,
-			("beacon slot %u not empty?", avp->av_bslot));
+		if (sc->sc_bslot[avp->av_bslot]) {
+			free_netdev(dev);
+			return NULL;
+		}
+
 		sc->sc_bslot[avp->av_bslot] = vap;
 		sc->sc_nbcnvaps++;
 
@@ -1475,15 +1460,7 @@ ath_vap_create(struct ieee80211com *ic,
 			 * of staggered beacons.
 			 */
 			/* XXX check for beacon interval too small */
-			if (ath_maxvaps > 4) {
-				DPRINTF(sc, ATH_DEBUG_BEACON, 
-						"Staggered beacons are not "
-						"possible with maxvaps set "
-						"to %d.\n", ath_maxvaps);
-				sc->sc_stagbeacons = 0;
-			} else {
-				sc->sc_stagbeacons = 1;
-			}
+			sc->sc_stagbeacons = 1;
 		}
 		DPRINTF(sc, ATH_DEBUG_BEACON, "sc->sc_stagbeacons %sabled\n", 
 				(sc->sc_stagbeacons ? "en" : "dis"));
@@ -1553,7 +1530,7 @@ ath_vap_create(struct ieee80211com *ic,
 		if (ath_startrecv(sc) != 0)	/* restart recv */
 			EPRINTF(sc, "Unable to start receive logic.\n");
 		if (sc->sc_beacons)
-			ath_beacon_config(sc, NULL);	/* restart beacons */
+			ath_beacon_config(sc, NULL, 0);	/* restart beacons */
 		ath_hal_intrset(ah, sc->sc_imask);
 	}
 
@@ -1681,7 +1658,7 @@ ath_vap_delete(struct ieee80211vap *vap)
 		if (ath_startrecv(sc) != 0)		/* restart recv. */
 			EPRINTF(sc, "Unable to start receive logic.\n");
 		if (sc->sc_beacons)
-			ath_beacon_config(sc, NULL);	/* restart beacons */
+			ath_beacon_config(sc, NULL, 0);	/* restart beacons */
 		ath_hal_intrset(ah, sc->sc_imask);
 	}
 }
@@ -3066,7 +3043,7 @@ ath_reset(struct net_device *dev)
 	 */
 	ath_chan_change(sc, c);
 	if (sc->sc_beacons)
-		ath_beacon_config(sc, NULL);	/* restart beacons */
+		ath_beacon_config(sc, NULL, 1);	/* restart beacons */
 	ath_hal_intrset(ah, sc->sc_imask);
 	ath_set_ack_bitrate(sc, sc->sc_ackrate);
 	netif_wake_queue(dev);		/* restart xmit */
@@ -4763,7 +4740,7 @@ ath_check_beacon_done(struct ath_softc *
 	/*
 	 * check if the last beacon went out with the mode change flag set.
 	 */
-	for (slot = 0; slot < ath_maxvaps; slot++) {
+	for (slot = 0; slot < ATH_MAXVAPS_BCN; slot++) {
 		if (sc->sc_bslot[slot]) {
 			vap = sc->sc_bslot[slot];
 			break;
@@ -4968,7 +4945,7 @@ ath_beacon_alloc_internal(struct ath_sof
 		 * has a timestamp in one beacon interval while the
 		 * others get a timestamp aligned to the next interval.
 		 */
-		tuadjust = (ni->ni_intval * (ath_maxvaps - avp->av_bslot)) / ath_maxvaps;
+		tuadjust = (ni->ni_intval * (ATH_MAXVAPS_BCN - avp->av_bslot)) / ATH_MAXVAPS_BCN;
 		tsfadjust = cpu_to_le64(tuadjust << 10);	/* TU->TSF */
 
 		DPRINTF(sc, ATH_DEBUG_BEACON,
@@ -5361,8 +5338,8 @@ ath_beacon_send(struct ath_softc *sc, in
 		u_int32_t tsftu;
 
 		tsftu = hw_tsf >> 10; /* NB: 64 -> 32: See note far above. */
-		slot = ((tsftu % ic->ic_lintval) * ath_maxvaps) / ic->ic_lintval;
-		vap = sc->sc_bslot[(slot + 1) % ath_maxvaps];
+		slot = ((tsftu % ic->ic_lintval) * ATH_MAXVAPS_BCN) / ic->ic_lintval;
+		vap = sc->sc_bslot[(slot + 1) % ATH_MAXVAPS_BCN];
 		DPRINTF(sc, ATH_DEBUG_BEACON_PROC,
 			"Slot %d [tsf %llu tsftu %llu intval %u] vap %p\n",
 			slot, (unsigned long long)hw_tsf, 
@@ -5377,7 +5354,7 @@ ath_beacon_send(struct ath_softc *sc, in
 		u_int32_t *bflink = NULL;
 
 		/* XXX: rotate/randomize order? */
-		for (slot = 0; slot < ath_maxvaps; slot++) {
+		for (slot = 0; slot < ATH_MAXVAPS_BCN; slot++) {
 			if ((vap = sc->sc_bslot[slot]) != NULL) {
 				if ((bf = ath_beacon_generate(
 						sc, vap, 
@@ -5418,7 +5395,7 @@ ath_beacon_send(struct ath_softc *sc, in
 	 *     again.  If we miss a beacon for that slot then we'll be
 	 *     slow to transition but we'll be sure at least one beacon
 	 *     interval has passed.  When bursting slot is always left
-	 *     set to ath_maxvaps so this check is a no-op.
+	 *     set to ATH_MAXVAPS_BCN so this check is a no-op.
 	 */
 	/* XXX locking */
 	if (sc->sc_updateslot == UPDATE) {
@@ -5526,7 +5503,7 @@ ath_beacon_free(struct ath_softc *sc)
  * (2^(32 + 10 - 1) - 1)us is a really long time.
  */
 static void
-ath_beacon_config(struct ath_softc *sc, struct ieee80211vap *vap)
+ath_beacon_config(struct ath_softc *sc, struct ieee80211vap *vap, int reset)
 {
 	struct ieee80211com *ic = &sc->sc_ic;
 	struct ath_hal *ah = sc->sc_ah;
@@ -5553,7 +5530,7 @@ ath_beacon_config(struct ath_softc *sc,
 	/* We should reset hw TSF only once, so we increment
 	 * ni_tstamp.tsf to avoid resetting the hw TSF multiple
 	 * times */
-	if (tsf == 0) {
+	if (tsf == 0 || reset) {
 		reset_tsf = 1;
 		ni->ni_tstamp.tsf = cpu_to_le64(1);
 	}
@@ -5567,7 +5544,7 @@ ath_beacon_config(struct ath_softc *sc,
 		/* NB: the beacon interval is kept internally in TUs */
 		intval = ic->ic_lintval & HAL_BEACON_PERIOD;
 		if (sc->sc_stagbeacons)
-			intval /= ath_maxvaps;	/* for staggered beacons */
+			intval /= ATH_MAXVAPS_BCN;	/* for staggered beacons */
 		if ((sc->sc_nostabeacons) &&
 		    (vap->iv_opmode == IEEE80211_M_HOSTAP))
 			reset_tsf = 1;
@@ -5583,31 +5560,24 @@ ath_beacon_config(struct ath_softc *sc,
 		 * time */
 		nexttbtt = intval;
 	} else if (intval) {	/* NB: can be 0 for monitor mode */
-		if (tsf == 1) {
-			/* We have not received any beacons or probe
-			 * responses. Since a beacon should be sent
-			 * every 'intval' ms, we compute the next
-			 * beacon timestamp using the hardware TSF. We
-			 * ensure that it is at least FUDGE TUs ahead
-			 * of the current TSF. Otherwise, we use the
-			 * next beacon timestamp again */
- 			nexttbtt = roundup(hw_tsftu + FUDGE, intval);
-		} 
-		else if (ic->ic_opmode == IEEE80211_M_IBSS) {
-			if (tsf > hw_tsf) {
-				/* We received a beacon, but the HW TSF has
-				 * not been updated (otherwise hw_tsf > tsf)
-				 * We cannot use the hardware TSF, so we
-				 * wait to synchronize beacons again. */
-				sc->sc_syncbeacon = 1;
-				goto ath_beacon_config_debug;
-			} else {
-				/* Normal case: we received a beacon to which
-				 * we have synchronized. Make sure that nexttbtt
-				 * is at least FUDGE TU ahead of hw_tsf */
-				nexttbtt = tsftu + roundup(hw_tsftu + FUDGE - 
-						tsftu, intval);
-			}
+		if ((tsf > hw_tsf) && (ic->ic_opmode == IEEE80211_M_IBSS)) {
+			/* We received a beacon, but the HW TSF has
+			 * not been updated (otherwise hw_tsf > tsf)
+			 * We cannot use the hardware TSF, so we
+			 * wait to synchronize beacons again. */
+			sc->sc_syncbeacon = 1;
+			goto ath_beacon_config_debug;
+		} else if ((tsftu + FUDGE) > hw_tsftu) {
+			if (tsftu > hw_tsftu + 2 * intval)
+				nexttbtt = roundup(hw_tsftu + FUDGE, intval);
+			else
+				nexttbtt = tsftu;
+		} else {
+			/* Normal case: we received a beacon to which
+			 * we have synchronized. Make sure that nexttbtt
+			 * is at least FUDGE TU ahead of hw_tsf */
+			nexttbtt = tsftu + roundup(hw_tsftu + FUDGE -
+					tsftu, intval);
 		}
 	}
 
@@ -5730,9 +5700,6 @@ ath_beacon_config(struct ath_softc *sc,
 		ath_beacon_dturbo_config(vap, intval &
 				~(HAL_BEACON_RESET_TSF | HAL_BEACON_ENA));
 #endif
-		if ((nexttbtt & HAL_BEACON_PERIOD) - (ath_hal_gettsf32(ah) >> 10)
-				<= ath_hal_sw_beacon_response_time)
-			nexttbtt += intval;
 		sc->sc_nexttbtt = nexttbtt;
 
 		/* stop beacons before reconfiguring the timers to avoid race
@@ -5889,7 +5856,7 @@ ath_desc_alloc(struct ath_softc *sc)
 
 	/* XXX allocate beacon state together with VAP */
 	error = ath_descdma_setup(sc, &sc->sc_bdma, &sc->sc_bbuf,
-			"beacon", ath_maxvaps, 1);
+			"beacon", ATH_MAXVAPS_BCN, 1);
 	if (error != 0) {
 		ath_descdma_cleanup(sc, &sc->sc_txdma, &sc->sc_txbuf,
 			BUS_DMA_TODEVICE);
@@ -6680,7 +6647,7 @@ ath_recv_mgmt(struct ieee80211vap * vap,
 			/* Resync beacon timers using the tsf of the
 			 * beacon frame we just received. */
 			vap->iv_flags_ext &= ~IEEE80211_FEXT_APPIE_UPDATE;
-			ath_beacon_config(sc, vap);
+			ath_beacon_config(sc, vap, 0);
 			DPRINTF(sc, ATH_DEBUG_BEACON, 
 				"Updated beacon timers\n");
 		}
@@ -9359,7 +9326,7 @@ ath_chan_set(struct ath_softc *sc, struc
 		 * HW seems to turn off beacons during turbo mode switch.
 		 */
 		if (sc->sc_beacons && !sc->sc_dfs_cac)
-			ath_beacon_config(sc, NULL);
+			ath_beacon_config(sc, NULL, 0);
 		/*
 		 * Re-enable interrupts.
 		 */
@@ -9813,7 +9780,7 @@ ath_newstate(struct ieee80211vap *vap, e
 					ATH_DEBUG_BEACON_PROC, 
 				"Beacons reconfigured by %p[%s]!\n",
 				vap, vap->iv_nickname);
-			ath_beacon_config(sc, vap);
+			ath_beacon_config(sc, vap, 1);
 			sc->sc_beacons = 1;
 		}
 	} else {
@@ -9948,9 +9915,6 @@ ath_dfs_cac_completed(unsigned long data
 		}
 		netif_wake_queue(dev);
 		ath_reset(dev);
-		if (sc->sc_beacons) {
-			ath_beacon_config(sc, NULL);
-		}
 		dev->watchdog_timeo = 5 * HZ; /* restore normal timeout */
 	} else {
 		do_gettimeofday(&tv);
@@ -11473,9 +11437,6 @@ ATH_SYSCTL_DECL(ath_sysctl_halparam, ctl
 		case ATH_OUTDOOR:
 			val = ic->ic_country_outdoor;
 			break;
-		case ATH_MAXVAPS:
-			val = ath_maxvaps;
-			break;
 		case ATH_REGDOMAIN:
 			ath_hal_getregdomain(ah, &val);
 			break;
@@ -11606,12 +11567,6 @@ static const ctl_table ath_sysctl_templa
 	  .extra2	= (void *)ATH_OUTDOOR,
 	},
 	{ .ctl_name	= CTL_AUTO,
-	  .procname	= "maxvaps",
-	  .mode		= 0444,
-	  .proc_handler	= ath_sysctl_halparam,
-	  .extra2	= (void *)ATH_MAXVAPS,
-	},
-	{ .ctl_name	= CTL_AUTO,
 	  .procname	= "regdomain",
 	  .mode		= 0644,
 	  .proc_handler	= ath_sysctl_halparam,
@@ -11928,13 +11883,6 @@ static ctl_table ath_static_sysctls[] =
 	},
 #endif
 	{ .ctl_name	= CTL_AUTO,
-	  .procname	= "maxvaps",
-	  .mode		= 0444,
-	  .data		= &ath_maxvaps,
-	  .maxlen	= sizeof(ath_maxvaps),
-	  .proc_handler	= proc_dointvec
-	},
-	{ .ctl_name	= CTL_AUTO,
 	  .procname	= "xchanmode",
 	  .mode		= 0444,
 	  .data		= &ath_xchanmode,
--- a/ath/if_athvar.h
+++ b/ath/if_athvar.h
@@ -211,9 +211,7 @@ static inline struct net_device *_alloc_
 #define	ATH_RXBUF	40		/* number of RX buffers */
 #define	ATH_TXBUF	200		/* number of TX buffers */
 
-#define ATH_MAXVAPS_MIN 	2	/* minimum number of beacon buffers */
-#define ATH_MAXVAPS_MAX 	64	/* maximum number of beacon buffers */
-#define ATH_MAXVAPS_DEFAULT 	4	/* default number of beacon buffers */
+#define ATH_MAXVAPS_BCN		4	/* maximum number of beacon buffers */
 
 /* free buffer threshold to restart net dev */
 #define	ATH_TXBUF_FREE_THRESHOLD  (ATH_TXBUF / 20)