madwifi: rework tx power handling, don't clamp user-configured tx power limit based on current channel properties

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15031 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 243 insertions, 0 deletions

diff --git a/package/madwifi/patches/414-txpower.patch b/package/madwifi/patches/414-txpower.patch
new file mode 100644
index 000000000..3e7e315d1
--- /dev/null
+++ b/package/madwifi/patches/414-txpower.patch
@@ -0,0 +1,243 @@
+--- a/net80211/ieee80211.c
++++ b/net80211/ieee80211.c
+@@ -270,6 +270,7 @@ ieee80211_ifattach(struct ieee80211com *
+ 		("invalid number of channels specified: %u", ic->ic_nchans));
+ 	memset(ic->ic_chan_avail, 0, sizeof(ic->ic_chan_avail));
+ 	ic->ic_modecaps |= 1 << IEEE80211_MODE_AUTO;
++	ic->ic_max_txpower = IEEE80211_TXPOWER_MIN;
+ 
+ 	for (i = 0; i < ic->ic_nchans; i++) {
+ 		c = &ic->ic_channels[i];
+@@ -277,6 +278,7 @@ ieee80211_ifattach(struct ieee80211com *
+ 		KASSERT(c->ic_ieee < IEEE80211_CHAN_MAX,
+ 			("channel with bogus ieee number %u", c->ic_ieee));
+ 		setbit(ic->ic_chan_avail, c->ic_ieee);
++		ic->ic_max_txpower = max(ic->ic_max_txpower, (u16) c->ic_maxpower * 2);
+ 
+ 		if (c->ic_scanflags & IEEE80211_NOSCAN_DEFAULT)
+ 			c->ic_scanflags |= IEEE80211_NOSCAN_SET;
+@@ -346,8 +348,6 @@ ieee80211_ifattach(struct ieee80211com *
+ 	TAILQ_INIT(&ic->ic_vaps);
+ 
+ 	ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
+-	ic->ic_txpowlimit = IEEE80211_TXPOWER_MIN;
+-	ic->ic_newtxpowlimit = IEEE80211_TXPOWER_MAX;
+ 
+ 	init_timer(&ic->ic_dfs_excl_timer);
+ 	ic->ic_dfs_excl_timer.function = 
+--- a/net80211/ieee80211_node.c
++++ b/net80211/ieee80211_node.c
+@@ -1125,7 +1125,7 @@ ieee80211_alloc_node(struct ieee80211vap
+ 
+ 		ni->ni_chan = IEEE80211_CHAN_ANYC;
+ 		ni->ni_authmode = IEEE80211_AUTH_OPEN;
+-		ni->ni_txpower = ic->ic_txpowlimit;
++		ni->ni_txpower = IEEE80211_TXPOWER_MAX;
+ 
+ 		ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey,
+ 			IEEE80211_KEYIX_NONE);
+--- a/net80211/ieee80211_var.h
++++ b/net80211/ieee80211_var.h
+@@ -343,8 +343,9 @@ struct ieee80211com {
+ 	u_int16_t ic_holdover;			/* PM hold over duration */
+ 	u_int16_t ic_bmissthreshold;		/* beacon miss threshold (# beacons) */
+ 	unsigned long ic_bmiss_guard;		/* when to cease ignoring bmiss (jiffies) */
+-	u_int16_t ic_txpowlimit; 		/* global tx power limit (in 0.5 dBm) */
+-	u_int16_t ic_newtxpowlimit; 		/* tx power limit to change to (in 0.5 dBm) */
++	u_int16_t ic_txpowlimit; 		/* configured global tx power limit (in 0.5 dBm) */
++	u_int16_t ic_max_txpower;			/* global hardware tx power limit */
++	u_int16_t ic_cur_txpower;			/* current tx power */
+ 	u_int16_t ic_uapsdmaxtriggers; 		/* max triggers that could arrive */
+ 	u_int8_t ic_coverageclass; 		/* coverage class */
+ 	u_int8_t ic_protmode_rssi;			/* rssi threshold for protection mode */
+--- a/net80211/ieee80211_wireless.c
++++ b/net80211/ieee80211_wireless.c
+@@ -920,17 +920,23 @@ ieee80211_ioctl_giwrange(struct net_devi
+ 	u_int8_t reported[IEEE80211_CHAN_BYTES];	/* XXX stack usage? */
+ 	int i, r;
+ 	int step = 0;
++	u_int16_t power;
+ 
+ 	data->length = sizeof(struct iw_range);
+ 	memset(range, 0, sizeof(struct iw_range));
+ 
++	power = ic->ic_max_txpower;
++	if (ic->ic_bsschan && (ic->ic_bsschan != IEEE80211_CHAN_ANYC))
++		power = min(power, ic->ic_bsschan->ic_maxpower);
++
+ 	/* txpower (128 values, but will print out only IW_MAX_TXPOWER) */
+-	range->num_txpower = (ic->ic_txpowlimit >= 8) ? IW_MAX_TXPOWER : ic->ic_txpowlimit;
+-	step = ic->ic_txpowlimit / (2 * (IW_MAX_TXPOWER - 1));
++	power /= 2; /* Unit: 0.5 dBm */
++	range->num_txpower = (power >= 8) ? IW_MAX_TXPOWER : power;
++	step = power / (IW_MAX_TXPOWER - 1);
+ 
+ 	range->txpower[0] = 0;
+ 	for (i = 1; i < IW_MAX_TXPOWER; i++)
+-		range->txpower[i] = (ic->ic_txpowlimit/2)
++		range->txpower[i] = power
+ 			- (IW_MAX_TXPOWER - i - 1) * step;
+ 
+ 	range->txpower_capa = IW_TXPOW_DBM;
+@@ -1382,10 +1388,8 @@ ieee80211_ioctl_siwtxpow(struct net_devi
+ 	disabled = (fixed && vap->iv_bss->ni_txpower == 0);
+ 	if (rrq->disabled) {
+ 		if (!disabled) {
+-			if ((ic->ic_caps & IEEE80211_C_TXPMGT) == 0)
+-				return -EOPNOTSUPP;
+ 			ic->ic_flags |= IEEE80211_F_TXPOW_FIXED;
+-			vap->iv_bss->ni_txpower = 0;
++			ic->ic_txpowlimit = 0;
+ 			goto done;
+ 		}
+ 		return 0;
+@@ -1396,30 +1400,12 @@ ieee80211_ioctl_siwtxpow(struct net_devi
+ 			return -EOPNOTSUPP;
+ 		if (rrq->flags != IW_TXPOW_DBM)
+ 			return -EINVAL;
+-		if (ic->ic_bsschan != IEEE80211_CHAN_ANYC) {
+-			if ((ic->ic_bsschan->ic_maxregpower >= rrq->value) &&
+-			    (ic->ic_txpowlimit/2 >= rrq->value)) {
+-				vap->iv_bss->ni_txpower = 2 * rrq->value;
+-				ic->ic_newtxpowlimit = 2 * rrq->value;
+-				ic->ic_flags |= IEEE80211_F_TXPOW_FIXED;
+-			} else
+-				return -EINVAL;
+-		} else {
+-			/*
+-			 * No channel set yet
+-			 */
+-			if (ic->ic_txpowlimit/2 >= rrq->value) {
+-				vap->iv_bss->ni_txpower = 2 * rrq->value;
+-				ic->ic_newtxpowlimit = 2 * rrq->value;
+-				ic->ic_flags |= IEEE80211_F_TXPOW_FIXED;
+-			}
+-			else
+-				return -EINVAL;
+-		}
++		ic->ic_txpowlimit = 2 * rrq->value;
++		ic->ic_flags |= IEEE80211_F_TXPOW_FIXED;
+ 	} else {
+ 		if (!fixed)		/* no change */
+ 			return 0;
+-		ic->ic_newtxpowlimit = IEEE80211_TXPOWER_MAX;
++		ic->ic_txpowlimit = IEEE80211_TXPOWER_MAX;
+ 		ic->ic_flags &= ~IEEE80211_F_TXPOW_FIXED;
+ 	}
+ done:
+@@ -1588,9 +1574,22 @@ ieee80211_ioctl_giwtxpow(struct net_devi
+ {
+ 	struct ieee80211vap *vap = dev->priv;
+ 	struct ieee80211com *ic = vap->iv_ic;
+-
+-	rrq->value = vap->iv_bss->ni_txpower / 2;
+-	rrq->fixed = (ic->ic_flags & IEEE80211_F_TXPOW_FIXED) != 0;
++	unsigned int power = ic->ic_txpowlimit;
++	struct ieee80211_channel *c;
++	u_int16_t txp = ic->ic_max_txpower;
++
++	if (ic->ic_bsschan && (ic->ic_bsschan != IEEE80211_CHAN_ANYC))
++		txp = min(txp, ic->ic_bsschan->ic_maxpower);
++	} else if (ic->ic_cur_txpower > 0) {
++		txp = min(txp, ic->ic_cur_txpower);
++	}
++	if (ic->ic_flags & IEEE80211_F_TXPOW_FIXED) {
++		txp = min(txp, ic->ic_txpowlimit);
++		rrq->fixed = 1;
++	} else {
++		rrq->fixed = 0;
++	}
++	rrq->value = txp / 2;
+ 	rrq->disabled = (rrq->fixed && rrq->value == 0);
+ 	rrq->flags = IW_TXPOW_DBM;
+ 	return 0;
+--- a/ath/if_ath.c
++++ b/ath/if_ath.c
+@@ -380,7 +380,6 @@ static unsigned int ath_dump_hal_map(str
+ static u_int32_t ath_get_clamped_maxtxpower(struct ath_softc *sc);
+ static u_int32_t ath_set_clamped_maxtxpower(struct ath_softc *sc, 
+ 		u_int32_t new_clamped_maxtxpower);
+-static u_int32_t ath_get_real_maxtxpower(struct ath_softc *sc);
+ 
+ static void ath_poll_disable(struct net_device *dev);
+ static void ath_poll_enable(struct net_device *dev);
+@@ -3159,7 +3158,7 @@ ath_tx_startraw(struct net_device *dev, 
+ 	try0 = ph->try0;
+ 	rt = sc->sc_currates;
+ 	txrate = dot11_to_ratecode(sc, rt, ph->rate0);
+-	power = ph->power > 60 ? 60 : ph->power;
++	power = ph->power > 63 ? 63 : ph->power;
+ 	hdrlen = ieee80211_anyhdrsize(wh);
+ 	pktlen = skb->len + IEEE80211_CRC_LEN;
+ 
+@@ -8381,7 +8380,7 @@ ath_tx_start(struct net_device *dev, str
+ 			    pktlen,			/* packet length */
+ 			    hdrlen,			/* header length */
+ 			    atype,			/* Atheros packet type */
+-			    MIN(ni->ni_txpower, 60),	/* txpower */
++			    MIN(ni->ni_txpower, 63),	/* txpower */
+ 			    txrate, try0,		/* series 0 rate/tries */
+ 			    keyix,			/* key cache index */
+ 			    antenna,			/* antenna mode */
+@@ -10364,59 +10363,16 @@ ath_get_clamped_maxtxpower(struct ath_so
+ 
+ /* XXX: this function needs some locking to avoid being called 
+  * twice/interrupted */
+-/* 1. Save the currently specified maximum txpower (as clamped by madwifi)
+- * 2. Determine the real maximum txpower the card can support by
+- *    setting a value that exceeds the maximum range (by one) and
+- *    finding out what it limits us to.
+- * 3. Restore the saved maxtxpower value we had previously specified */
+-static u_int32_t
+-ath_get_real_maxtxpower(struct ath_softc *sc)
+-{
+-	u_int32_t saved_clamped_maxtxpower;
+-	u_int32_t real_maxtxpower;
+-
+-	saved_clamped_maxtxpower = ath_get_clamped_maxtxpower(sc);
+-	real_maxtxpower = 
+-		ath_set_clamped_maxtxpower(sc, IEEE80211_TXPOWER_MAX + 1);
+-	ath_set_clamped_maxtxpower(sc, saved_clamped_maxtxpower);
+-	return real_maxtxpower;
+-}
+-
+-
+-/* XXX: this function needs some locking to avoid being called 
+- * twice/interrupted */
+ static void
+ ath_update_txpow(struct ath_softc *sc)
+ {
+ 	struct ieee80211com *ic = &sc->sc_ic;
+ 	struct ieee80211vap *vap = NULL;
+ 	struct ath_hal *ah = sc->sc_ah;
+-	u_int32_t prev_clamped_maxtxpower = 0;
+-	u_int32_t new_clamped_maxtxpower = 0;
+ 
+ 	/* Determine the previous value of maxtxpower */
+-	prev_clamped_maxtxpower = ath_get_clamped_maxtxpower(sc);
+-	/* Determine the real maximum txpower the card can support */
+-	ic->ic_txpowlimit = ath_get_real_maxtxpower(sc);
+-	/* Grab the new maxtxpower setting (which may have changed) */
+-	new_clamped_maxtxpower = ic->ic_newtxpowlimit;
+-	/* Make sure the change is within limits, clamp it otherwise */
+-	if (ic->ic_newtxpowlimit > ic->ic_txpowlimit)
+-		new_clamped_maxtxpower = ic->ic_txpowlimit;
+-	/* Search for the VAP that needs a txpow change, if any */
+-	TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
+-		if (!tpc || ic->ic_newtxpowlimit != vap->iv_bss->ni_txpower) {
+-			vap->iv_bss->ni_txpower = new_clamped_maxtxpower;
+-			ieee80211_iterate_nodes(&vap->iv_ic->ic_sta, 
+-					set_node_txpower, 
+-					&new_clamped_maxtxpower);
+-		}
+-	}
+-
+-	/* Store the assigned (clamped) maximum txpower and update the HAL */
+-	sc->sc_curtxpow = new_clamped_maxtxpower;
+-	if (new_clamped_maxtxpower != prev_clamped_maxtxpower)
+-		ath_hal_settxpowlimit(ah, new_clamped_maxtxpower);
++	ath_set_clamped_maxtxpower(sc, ic->ic_txpowlimit);
++	ic->ic_cur_txpower = ath_get_clamped_maxtxpower(sc);
+ }
+ 
+ #ifdef ATH_SUPERG_XR