ath_rate/onoe/onoe.c

34  * Atsushi Onoe's rate control algorithm.
73  * Default parameters for the rate control algorithm.  These are
74  * all tunable with sysctls.  The rate controller runs periodically
78  * it gives a "raise rate credit".  If transmits look to not be working
80  * the transmit rate is raised.  Various error conditions force the
81  * the transmit rate to be dropped.
87  * the transmit rate is increased.
91 static	int ath_rateinterval = 1000;		/* rate ctl interval (ms)  */
93 static	int ath_rate_raise_threshold = 10;	/* rate ctl raise threshold */
96 			int rate);
130  * the returned rate with the relevant preamble rate flag.
191 ath_rate_update(struct ath_softc *sc, struct ieee80211_node *ni, int rate)
199 	KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
202 	     "%s: set xmit rate to %dM", __func__,
204 		(ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL) / 2 : 0);
207 	 * Before associating a node has no rate set setup
211 	 * lowest hardware rate.
215 	on->on_rix = rate;
216 	ni->ni_txrate = ni->ni_rates.rs_rates[rate] & IEEE80211_RATE_VAL;
224 		 * Hardware supports multi-rate retry; setup two
225 		 * step-down retry rates and make the lowest rate
230 		on->on_tx_try0 = 1 + 3;		/* 4 tries at rate 0 */
231 		if (--rate >= 0) {
233 				ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL];
240 		if (--rate >= 0) {
242 				ni->ni_rates.rs_rates[rate]&IEEE80211_RATE_VAL];
249 		if (rate > 0) {
258 		on->on_tx_try0 = ATH_TXMAXTRY;	/* max tries at rate 0 */
273  * Set the starting transmit rate for a node.
285 		 * No fixed rate is requested. For 11b start with
286 		 * the highest negotiated rate; otherwise, for 11g
292 			 * Scan the negotiated rate set to find the
293 			 * closest rate.
295 			/* NB: the rate set is assumed sorted */
301 		 * A fixed rate is to be used; ic_fixed_rate is the
302 		 * IEEE code for this rate (sans basic bit).  Convert this
303 		 * to the index into the negotiated rate set for
304 		 * the node.  We know the rate is there because the
305 		 * rate set is checked when the station associates.
307 		/* NB: the rate set is assumed sorted */
313 	 * The selected rate may not be available due to races
315 	 * adhoc mode may not have any rate set so this lookup
323  * Examine and potentially adjust the transmit rate.
370 		/* raise rate if we hit rate_raise_threshold */
400 		"rate control: operation interval (ms)");
404 		"rate control: retry threshold to credit rate raise (%%)");
407 		"rate control: # good periods before raising rate");