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42 * Defintions for the Atheros Wireless LAN controller driver.
44 #ifndef _DEV_ATH_RATE_SAMPLE_H
45 #define _DEV_ATH_RATE_SAMPLE_H
47 /* per-device state */
49 struct ath_ratectrl arc; /* base class */
50 int smoothing_rate; /* ewma percentage [0..99] */
51 int smoothing_minpackets;
52 int sample_rate; /* %time to try different tx rates */
53 int max_successive_failures;
54 int stale_failure_timeout; /* how long to honor max_successive_failures */
55 int min_switch; /* min time between rate changes */
56 int min_good_pct; /* min good percentage for a rate to be considered */
58 #define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc)
61 unsigned average_tx_time;
62 int successive_failures;
64 uint64_t total_packets; /* pkts total since assoc */
65 uint64_t packets_acked; /* pkts acked since assoc */
66 int ewma_pct; /* EWMA percentage */
67 unsigned perfect_tx_time; /* transmit time for 0 retries */
72 uint8_t t0, r0; /* series 0: tries, rate code */
73 uint8_t t1, r1; /* series 1: tries, rate code */
74 uint8_t t2, r2; /* series 2: tries, rate code */
75 uint8_t t3, r3; /* series 3: tries, rate code */
79 * We track performance for eight different packet size buckets.
81 #define NUM_PACKET_SIZE_BINS 7
83 static const int packet_size_bins[NUM_PACKET_SIZE_BINS] = { 250, 1600, 4096, 8192, 16384, 32768, 65536 };
86 bin_to_size(int index)
88 return packet_size_bins[index];
93 int static_rix; /* rate index of fixed tx rate */
94 #define SAMPLE_MAXRATES 64 /* NB: corresponds to hal info[32] */
95 uint64_t ratemask; /* bit mask of valid rate indices */
96 const struct txschedule *sched; /* tx schedule table */
98 const HAL_RATE_TABLE *currates;
100 struct rate_stats stats[NUM_PACKET_SIZE_BINS][SAMPLE_MAXRATES];
101 int last_sample_rix[NUM_PACKET_SIZE_BINS];
103 int current_sample_rix[NUM_PACKET_SIZE_BINS];
104 int packets_sent[NUM_PACKET_SIZE_BINS];
106 int current_rix[NUM_PACKET_SIZE_BINS];
107 int packets_since_switch[NUM_PACKET_SIZE_BINS];
108 int ticks_since_switch[NUM_PACKET_SIZE_BINS];
110 int packets_since_sample[NUM_PACKET_SIZE_BINS];
111 unsigned sample_tt[NUM_PACKET_SIZE_BINS];
116 #define ATH_NODE_SAMPLE(an) ((struct sample_node *)&(an)[1])
117 #define IS_RATE_DEFINED(sn, rix) (((uint64_t) (sn)->ratemask & (1ULL<<((uint64_t) rix))) != 0)
120 #define MIN(a,b) ((a) < (b) ? (a) : (b))
123 #define MAX(a,b) ((a) > (b) ? (a) : (b))
126 #define WIFI_CW_MIN 31
127 #define WIFI_CW_MAX 1023
130 * Calculate the transmit duration of a frame.
132 static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
134 int rix, int short_retries,
135 int long_retries, int is_ht40)
137 const HAL_RATE_TABLE *rt = sc->sc_currates;
138 struct ieee80211com *ic = &sc->sc_ic;
141 unsigned t_slot = 20;
142 unsigned t_difs = 50;
143 unsigned t_sifs = 10;
146 int cw = WIFI_CW_MIN;
149 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
151 if (rix >= rt->rateCount) {
152 printf("bogus rix %d, max %u, mode %u\n",
153 rix, rt->rateCount, sc->sc_curmode);
156 cix = rt->info[rix].controlRate;
158 * XXX getting mac/phy level timings should be fixed for turbo
159 * rates, and there is probably a way to get this from the
162 switch (rt->info[rix].phy) {
163 case IEEE80211_T_OFDM:
168 case IEEE80211_T_TURBO:
179 /* fall through to default */
181 /* pg 205 ieee.802.11.pdf */
189 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
190 rt->info[rix].phy == IEEE80211_T_OFDM) {
191 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS)
193 else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY)
196 cix = rt->info[sc->sc_protrix].controlRate;
199 if (0 /*length > ic->ic_rtsthreshold */) {
207 /* NB: this is intentionally not a runtime check */
208 KASSERT(cix < rt->rateCount,
209 ("bogus cix %d, max %u, mode %u\n", cix, rt->rateCount,
212 ctsrate = rt->info[cix].rateCode | rt->info[cix].shortPreamble;
213 if (rts) /* SIFS + CTS */
214 ctsduration += rt->info[cix].spAckDuration;
216 /* XXX assumes short preamble, include SIFS */
217 ctsduration += ath_hal_pkt_txtime(sc->sc_ah, rt, length, rix,
220 if (cts) /* SIFS + ACK */
221 ctsduration += rt->info[cix].spAckDuration;
223 tt += (short_retries + 1) * ctsduration;
227 /* XXX assumes short preamble, include SIFS */
228 tt += (long_retries+1)*ath_hal_pkt_txtime(sc->sc_ah, rt, length, rix,
231 tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration);
233 for (x = 0; x <= short_retries + long_retries; x++) {
234 cw = MIN(WIFI_CW_MAX, (cw + 1) * 2);
235 tt += (t_slot * cw/2);
242 #endif /* _DEV_ATH_RATE_SAMPLE_H */