2 * Copyright (c) 2005 John Bicket
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40 * Defintions for the Atheros Wireless LAN controller driver.
42 #ifndef _DEV_ATH_RATE_SAMPLE_H
43 #define _DEV_ATH_RATE_SAMPLE_H
45 /* per-device state */
47 struct ath_ratectrl arc; /* base class */
48 int smoothing_rate; /* ewma percentage [0..99] */
49 int smoothing_minpackets;
50 int sample_rate; /* %time to try different tx rates */
51 int max_successive_failures;
52 int stale_failure_timeout; /* how long to honor max_successive_failures */
53 int min_switch; /* min time between rate changes */
55 #define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc)
58 unsigned average_tx_time;
59 int successive_failures;
63 unsigned perfect_tx_time; /* transmit time for 0 retries */
68 uint8_t t0, r0; /* series 0: tries, rate code */
69 uint8_t t1, r1; /* series 1: tries, rate code */
70 uint8_t t2, r2; /* series 2: tries, rate code */
71 uint8_t t3, r3; /* series 3: tries, rate code */
75 * for now, we track performance for three different packet
78 #define NUM_PACKET_SIZE_BINS 2
82 int static_rix; /* rate index of fixed tx rate */
83 #define SAMPLE_MAXRATES 32 /* NB: corresponds to hal info[32] */
84 uint32_t ratemask; /* bit mask of valid rate indices */
85 const struct txschedule *sched; /* tx schedule table */
87 struct rate_stats stats[NUM_PACKET_SIZE_BINS][SAMPLE_MAXRATES];
88 int last_sample_rix[NUM_PACKET_SIZE_BINS];
90 int current_sample_rix[NUM_PACKET_SIZE_BINS];
91 int packets_sent[NUM_PACKET_SIZE_BINS];
93 int current_rix[NUM_PACKET_SIZE_BINS];
94 int packets_since_switch[NUM_PACKET_SIZE_BINS];
95 unsigned ticks_since_switch[NUM_PACKET_SIZE_BINS];
97 int packets_since_sample[NUM_PACKET_SIZE_BINS];
98 unsigned sample_tt[NUM_PACKET_SIZE_BINS];
100 #define ATH_NODE_SAMPLE(an) ((struct sample_node *)&(an)[1])
101 #define IS_RATE_DEFINED(sn, rix) (((sn)->ratemask & (1<<(rix))) != 0)
104 #define MIN(a,b) ((a) < (b) ? (a) : (b))
107 #define MAX(a,b) ((a) > (b) ? (a) : (b))
110 #define WIFI_CW_MIN 31
111 #define WIFI_CW_MAX 1023
114 * Calculate the transmit duration of a frame.
116 static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
118 int rix, int short_retries,
119 int long_retries, int is_ht40)
121 const HAL_RATE_TABLE *rt = sc->sc_currates;
122 struct ifnet *ifp = sc->sc_ifp;
123 struct ieee80211com *ic = ifp->if_l2com;
126 unsigned t_slot = 20;
127 unsigned t_difs = 50;
128 unsigned t_sifs = 10;
131 int cw = WIFI_CW_MIN;
134 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
136 if (rix >= rt->rateCount) {
137 printf("bogus rix %d, max %u, mode %u\n",
138 rix, rt->rateCount, sc->sc_curmode);
141 cix = rt->info[rix].controlRate;
143 * XXX getting mac/phy level timings should be fixed for turbo
144 * rates, and there is probably a way to get this from the
147 switch (rt->info[rix].phy) {
148 case IEEE80211_T_OFDM:
153 case IEEE80211_T_TURBO:
164 /* fall through to default */
166 /* pg 205 ieee.802.11.pdf */
174 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
175 rt->info[rix].phy == IEEE80211_T_OFDM) {
176 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS)
178 else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY)
181 cix = rt->info[sc->sc_protrix].controlRate;
184 if (0 /*length > ic->ic_rtsthreshold */) {
192 /* NB: this is intentionally not a runtime check */
193 KASSERT(cix < rt->rateCount,
194 ("bogus cix %d, max %u, mode %u\n", cix, rt->rateCount,
197 ctsrate = rt->info[cix].rateCode | rt->info[cix].shortPreamble;
198 if (rts) /* SIFS + CTS */
199 ctsduration += rt->info[cix].spAckDuration;
201 /* XXX assumes short preamble */
202 ctsduration += ath_hal_pkt_txtime(sc->sc_ah, rt, length, rix,
205 if (cts) /* SIFS + ACK */
206 ctsduration += rt->info[cix].spAckDuration;
208 tt += (short_retries + 1) * ctsduration;
212 /* XXX assumes short preamble */
213 tt += (long_retries+1)*ath_hal_pkt_txtime(sc->sc_ah, rt, length, rix,
216 tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration);
218 for (x = 0; x <= short_retries + long_retries; x++) {
219 cw = MIN(WIFI_CW_MAX, (cw + 1) * 2);
220 tt += (t_slot * cw/2);
224 #endif /* _DEV_ATH_RATE_SAMPLE_H */