branch Attitude Adjustment

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@33625 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 249 insertions, 0 deletions

diff --git a/package/madwifi/patches/389-autochannel.patch b/package/madwifi/patches/389-autochannel.patch
new file mode 100644
index 000000000..548f09e7d
--- /dev/null
+++ b/package/madwifi/patches/389-autochannel.patch
@@ -0,0 +1,249 @@
+--- a/ath/if_ath.c
++++ b/ath/if_ath.c
+@@ -384,6 +384,7 @@ static u_int32_t ath_get_real_maxtxpower
+ 
+ static void ath_poll_disable(struct net_device *dev);
+ static void ath_poll_enable(struct net_device *dev);
++static void ath_fetch_idle_time(struct ath_softc *sc);
+ 
+ /* calibrate every 30 secs in steady state but check every second at first. */
+ static int ath_calinterval = ATH_SHORT_CALINTERVAL;
+@@ -2581,6 +2582,7 @@ ath_init(struct net_device *dev)
+ 	 * be followed by initialization of the appropriate bits
+ 	 * and then setup of the interrupt mask.
+ 	 */
++	ath_fetch_idle_time(sc);
+ 	sc->sc_curchan.channel = ic->ic_curchan->ic_freq;
+ 	sc->sc_curchan.channelFlags = ath_chan2flags(ic->ic_curchan);
+ 	if (!ath_hal_reset(ah, sc->sc_opmode, &sc->sc_curchan, AH_FALSE, &status)) {
+@@ -2914,6 +2916,48 @@ ath_hw_check_atim(struct ath_softc *sc,
+ 	return 0;
+ }
+ 
++#define AR5K_MIBC       0x0040
++#define AR5K_MIBC_FREEZE   (1 << 1)
++#define AR5K_TXFC       0x80ec
++#define AR5K_RXFC       0x80f0
++#define AR5K_RXCLEAR	0x80f4
++#define AR5K_CYCLES		0x80f8
++static void
++ath_fetch_idle_time(struct ath_softc *sc)
++{
++	struct ieee80211com *ic = &sc->sc_ic;
++	struct ath_hal *ah = sc->sc_ah;
++	u_int32_t cc, rx;
++	u_int32_t time = 0;
++
++	if (sc->sc_ah->ah_macType < 5212)
++		return;
++
++	if (!ic->ic_curchan || (ic->ic_curchan == IEEE80211_CHAN_ANYC))
++		return;
++
++	OS_REG_WRITE(ah, AR5K_MIBC, AR5K_MIBC_FREEZE);
++	rx = OS_REG_READ(ah, AR5K_RXCLEAR);
++	cc = OS_REG_READ(ah, AR5K_CYCLES);
++
++	if (!cc)
++		return;
++
++	if (rx > cc)
++		return; /* should not happen */
++
++	if (sc->sc_last_chan)
++		sc->sc_last_chan->ic_idletime = 100 * (cc - rx) / cc;
++	sc->sc_last_chan = ic->ic_curchan;
++
++	OS_REG_WRITE(ah, AR5K_RXCLEAR, 0);
++	OS_REG_WRITE(ah, AR5K_CYCLES, 0);
++	OS_REG_WRITE(ah, AR5K_TXFC, 0);
++	OS_REG_WRITE(ah, AR5K_RXFC, 0);
++	OS_REG_WRITE(ah, AR5K_MIBC, 0);
++}
++#undef AR5K_RXCLEAR
++#undef AR5K_CYCLES
+ 
+ /*
+  * Reset the hardware w/o losing operational state.  This is
+@@ -2941,6 +2985,7 @@ ath_reset(struct net_device *dev)
+ 	 * Convert to a HAL channel description with the flags
+ 	 * constrained to reflect the current operating mode.
+ 	 */
++	ath_fetch_idle_time(sc);
+ 	c = ic->ic_curchan;
+ 	sc->sc_curchan.channel = c->ic_freq;
+ 	sc->sc_curchan.channelFlags = ath_chan2flags(c);
+@@ -9023,6 +9068,7 @@ ath_chan_set(struct ath_softc *sc, struc
+ 	u_int8_t channel_change_required = 0;
+ 	struct timeval tv;
+ 
++
+ 	/*
+ 	 * Convert to a HAL channel description with
+ 	 * the flags constrained to reflect the current
+@@ -9031,6 +9077,14 @@ ath_chan_set(struct ath_softc *sc, struc
+ 	memset(&hchan, 0, sizeof(HAL_CHANNEL));
+ 	hchan.channel = chan->ic_freq;
+ 	hchan.channelFlags = ath_chan2flags(chan);
++
++	/* don't do duplicate channel changes, but do
++	 * store the available idle time */
++	ath_fetch_idle_time(sc);
++	if ((sc->sc_curchan.channel == hchan.channel) &&
++		(sc->sc_curchan.channelFlags == hchan.channelFlags))
++		return 0;
++
+ 	KASSERT(hchan.channel != 0,
+ 		("bogus channel %u/0x%x", hchan.channel, hchan.channelFlags));
+ 	do_gettimeofday(&tv);
+--- a/ath/if_athvar.h
++++ b/ath/if_athvar.h
+@@ -774,6 +774,7 @@ struct ath_softc {
+ 	struct ieee80211vap **sc_bslot;		/* beacon xmit slots */
+ 	int sc_bnext;				/* next slot for beacon xmit */
+ 
++	struct ieee80211_channel *sc_last_chan;
+ 	int sc_beacon_cal;			/* use beacon timer for calibration */
+ 	u_int64_t sc_lastcal;			/* last time the calibration was performed */
+ 	struct timer_list sc_cal_ch;		/* calibration timer */
+--- a/net80211/_ieee80211.h
++++ b/net80211/_ieee80211.h
+@@ -148,6 +148,7 @@ struct ieee80211_channel {
+ 	int8_t ic_maxpower;	/* maximum tx power in dBm */
+ 	int8_t ic_minpower;	/* minimum tx power in dBm */
+ 	u_int8_t ic_scanflags;
++	u_int8_t ic_idletime; /* phy idle time in % */
+ };
+ 
+ #define	IEEE80211_CHAN_MAX	255
+--- a/net80211/ieee80211_scan_ap.c
++++ b/net80211/ieee80211_scan_ap.c
+@@ -417,6 +417,19 @@ pc_cmp_rssi(struct ap_state *as, struct
+ 
+ /* This function must be invoked with locks acquired */
+ static int
++pc_cmp_idletime(struct ieee80211_channel *a,
++		struct ieee80211_channel *b)
++{
++	if (!a->ic_idletime || !b->ic_idletime)
++		return 0;
++
++	/* a is better than b (return < 0) when a has more idle time than b */
++	return b->ic_idletime - a->ic_idletime;
++}
++
++
++/* This function must be invoked with locks acquired */
++static int
+ pc_cmp_samechan(struct ieee80211com *ic, struct ieee80211_channel *a,
+ 		struct ieee80211_channel *b)
+ {
+@@ -451,6 +464,7 @@ pc_cmp(const void *_a, const void *_b)
+ 
+ 	EVALUATE_CRITERION(radar, a, b);
+ 	EVALUATE_CRITERION(keepmode, params, a, b);
++	EVALUATE_CRITERION(idletime, a, b);
+ 	EVALUATE_CRITERION(sc, ic, a, b);
+ 	/* XXX: rssi useless? pick_channel evaluates it anyway */
+ 	EVALUATE_CRITERION(rssi, params->ss->ss_priv, a, b);
+@@ -519,16 +533,9 @@ pick_channel(struct ieee80211_scan_state
+ #endif
+ 
+ 	best = NULL;
+-	best_rssi = 0xff; /* If signal is bigger than 0xff, we'd be melting. */
+ 
+ 	for (i = 0; i < ss_last; i++) {
+ 		c = &chans[i];
+-		benefit = best_rssi - as->as_maxrssi[c->chan->ic_ieee];
+-		sta_assoc = ic->ic_sta_assoc;
+-
+-		/* Don't switch... */
+-		if (benefit <= 0)
+-			continue;
+ 
+ 		/* Verify channel is not marked for non-occupancy */
+ 		if (IEEE80211_IS_CHAN_RADAR(c->chan))
+@@ -546,31 +553,8 @@ pick_channel(struct ieee80211_scan_state
+ 				break;
+ 		}
+ 
+-		if (sta_assoc != 0) {
+-			int sl = ic->ic_cn_total - 
+-				ic->ic_chan_nodes[c->chan->ic_ieee]; /* count */
+-			if (ic->ic_sc_algorithm == IEEE80211_SC_LOOSE) {
+-				int sl_max = ic->ic_sc_sldg * benefit;
+-				sl = 1000 * sl / sta_assoc; /* permil */
+-				IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
+-						"%s: chan %d, dB gained: %d, "
+-						"STAs lost: %d permil (max %d)\n",
+-						__func__, c->chan->ic_ieee, 
+-						benefit, sl, sl_max);
+-				if (sl > sl_max)
+-					continue;
+-			} else if (((ic->ic_sc_algorithm == 
+-						 IEEE80211_SC_TIGHT) ||
+-					(ic->ic_sc_algorithm == 
+-						 IEEE80211_SC_STRICT)) && 
+-					(sl > 0)) {
+-				/* Break the loop as the subsequent chans 
+-				 * won't be better. */
+-				break;
+-			}
+-		}
+ 		best = c->chan;
+-		best_rssi = as->as_maxrssi[best->ic_ieee];
++		break;
+ 	}
+ 
+ 	if (best != NULL) {
+@@ -599,6 +583,9 @@ ap_end(struct ieee80211_scan_state *ss,
+ 		("wrong opmode %u", vap->iv_opmode));
+ 
+ 	ic = vap->iv_ic;
++
++	/* record stats for the channel that was scanned last */
++	ic->ic_set_channel(ic);
+ 	bestchan = pick_channel(ss, vap, flags);
+ 	if (bestchan == NULL) {
+ 		if (ss->ss_last > 0) {
+--- a/net80211/ieee80211_scan.c
++++ b/net80211/ieee80211_scan.c
+@@ -1002,20 +1002,34 @@ ieee80211_scan_add_channels(struct ieee8
+ {
+ 	struct ieee80211_channel *c, *cg;
+ 	u_int modeflags;
++	int has_non_turbo = 0;
+ 	int i;
+ 
+ 	KASSERT(mode < ARRAY_SIZE(chanflags), ("Unexpected mode %u", mode));
+ 	modeflags = chanflags[mode];
+ 	for (i = 0; i < ic->ic_nchans; i++) {
+ 		c = &ic->ic_channels[i];
++		if (c->ic_flags & (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO))
++			continue;
++
++		has_non_turbo = 1;
++		break;
++	}
++	for (i = 0; i < ic->ic_nchans; i++) {
++		c = &ic->ic_channels[i];
+ 		if (c == NULL || isclr(ic->ic_chan_active, c->ic_ieee))
+ 			continue;
+ 		if (c->ic_scanflags & IEEE80211_NOSCAN_SET)
+ 			continue;
+-		if (modeflags &&
+-			((c->ic_flags & IEEE80211_CHAN_ALLTURBO) !=
+-			 (modeflags & IEEE80211_CHAN_ALLTURBO)))
+-			continue;
++		if (modeflags) {
++			if ((c->ic_flags & IEEE80211_CHAN_ALLTURBO) !=
++				 (modeflags & IEEE80211_CHAN_ALLTURBO))
++				continue;
++		} else if (has_non_turbo) {
++			if ((ss->ss_vap->iv_opmode == IEEE80211_M_HOSTAP) &&
++				(c->ic_flags & (IEEE80211_CHAN_TURBO | IEEE80211_CHAN_STURBO)))
++				continue;
++		}
+ 		if (mode == IEEE80211_MODE_AUTO) {
+ 			/*
+ 			 * XXX special-case 11b/g channels so we select