2 * Copyright (c) 2005 John Bicket
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36 * $FreeBSD: src/sys/dev/ath/ath_rate/sample/sample.h,v 1.7 2007/01/15 01:17:44 sam Exp $
37 * $DragonFly: src/sys/dev/netif/ath/rate_sample/sample.h,v 1.5 2007/02/22 05:17:10 sephe Exp $
41 * Defintions for the Atheros Wireless LAN controller driver.
43 #ifndef _DEV_ATH_RATE_SAMPLE_H
44 #define _DEV_ATH_RATE_SAMPLE_H
46 /* per-device state */
48 struct ath_ratectrl arc; /* base state */
49 int ath_smoothing_rate; /* ewma percentage (out of 100) */
50 int ath_sample_rate; /* send a different bit-rate 1/X packets */
52 #define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc)
58 int shortPreambleRateCode;
63 unsigned average_tx_time;
64 int successive_failures;
68 unsigned perfect_tx_time; /* transmit time for 0 retries */
73 * for now, we track performance for three different packet
76 #define NUM_PACKET_SIZE_BINS 3
77 static int packet_size_bins[NUM_PACKET_SIZE_BINS] = {250, 1600, 3000};
84 struct rate_info rates[IEEE80211_RATE_MAXSIZE];
86 struct rate_stats stats[NUM_PACKET_SIZE_BINS][IEEE80211_RATE_MAXSIZE];
87 int last_sample_ndx[NUM_PACKET_SIZE_BINS];
89 int current_sample_ndx[NUM_PACKET_SIZE_BINS];
90 int packets_sent[NUM_PACKET_SIZE_BINS];
92 int current_rate[NUM_PACKET_SIZE_BINS];
93 int packets_since_switch[NUM_PACKET_SIZE_BINS];
94 unsigned ticks_since_switch[NUM_PACKET_SIZE_BINS];
96 int packets_since_sample[NUM_PACKET_SIZE_BINS];
97 unsigned sample_tt[NUM_PACKET_SIZE_BINS];
99 #define ATH_NODE_SAMPLE(an) ((struct sample_node *)&an[1])
102 #define MIN(a,b) ((a) < (b) ? (a) : (b))
105 #define MAX(a,b) ((a) > (b) ? (a) : (b))
108 #define WIFI_CW_MIN 31
109 #define WIFI_CW_MAX 1023
112 * Definitions for pulling the rate and trie counts from
113 * a 5212 h/w descriptor. These Don't belong here; the
114 * driver should record this information so the rate control
115 * code doesn't go groveling around in the descriptor bits.
117 #define ds_ctl2 ds_hw[0]
118 #define ds_ctl3 ds_hw[1]
121 #define AR_XmitDataTries0 0x000f0000 /* series 0 max attempts */
122 #define AR_XmitDataTries0_S 16
123 #define AR_XmitDataTries1 0x00f00000 /* series 1 max attempts */
124 #define AR_XmitDataTries1_S 20
125 #define AR_XmitDataTries2 0x0f000000 /* series 2 max attempts */
126 #define AR_XmitDataTries2_S 24
127 #define AR_XmitDataTries3 0xf0000000 /* series 3 max attempts */
128 #define AR_XmitDataTries3_S 28
131 #define AR_XmitRate0 0x0000001f /* series 0 tx rate */
132 #define AR_XmitRate0_S 0
133 #define AR_XmitRate1 0x000003e0 /* series 1 tx rate */
134 #define AR_XmitRate1_S 5
135 #define AR_XmitRate2 0x00007c00 /* series 2 tx rate */
136 #define AR_XmitRate2_S 10
137 #define AR_XmitRate3 0x000f8000 /* series 3 tx rate */
138 #define AR_XmitRate3_S 15
140 /* TX ds_ctl3 for 5416 */
141 #define AR5416_XmitRate0 0x000000ff /* series 0 tx rate */
142 #define AR5416_XmitRate0_S 0
143 #define AR5416_XmitRate1 0x0000ff00 /* series 1 tx rate */
144 #define AR5416_XmitRate1_S 8
145 #define AR5416_XmitRate2 0x00ff0000 /* series 2 tx rate */
146 #define AR5416_XmitRate2_S 16
147 #define AR5416_XmitRate3 0xff000000 /* series 3 tx rate */
148 #define AR5416_XmitRate3_S 24
150 #define MS(_v, _f) (((_v) & (_f)) >> _f##_S)
153 * Calculate the transmit duration of a frame.
156 calc_usecs_unicast_packet(struct ath_softc *sc, int length, int rix,
157 int short_retries, int long_retries)
159 const HAL_RATE_TABLE *rt = sc->sc_currates;
162 unsigned t_slot = 20;
163 unsigned t_difs = 50;
164 unsigned t_sifs = 10;
165 struct ieee80211com *ic = &sc->sc_ic;
168 int cw = WIFI_CW_MIN;
171 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
173 if (rix >= rt->rateCount) {
174 kprintf("bogus rix %d, max %u, mode %u\n",
175 rix, rt->rateCount, sc->sc_curmode);
178 cix = rt->info[rix].controlRate;
180 * XXX getting mac/phy level timings should be fixed for turbo
181 * rates, and there is probably a way to get this from the
184 switch (rt->info[rix].phy) {
185 case IEEE80211_T_OFDM:
190 case IEEE80211_T_TURBO:
196 /* fall through to default */
198 /* pg 205 ieee.802.11.pdf */
206 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
207 rt->info[rix].phy == IEEE80211_T_OFDM) {
208 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS)
210 else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY)
213 cix = rt->info[sc->sc_protrix].controlRate;
217 if (0 /*length > ic->ic_rtsthreshold */)
224 /* NB: this is intentionally not a runtime check */
225 KASSERT(cix < rt->rateCount,
226 ("bogus cix %d, max %u, mode %u\n",
227 cix, rt->rateCount, sc->sc_curmode));
229 ctsrate = rt->info[cix].rateCode | rt->info[cix].shortPreamble;
230 if (rts) /* SIFS + CTS */
231 ctsduration += rt->info[cix].spAckDuration;
233 ctsduration += ath_hal_computetxtime(sc->sc_ah,
234 rt, length, rix, AH_TRUE);
236 if (cts) /* SIFS + ACK */
237 ctsduration += rt->info[cix].spAckDuration;
239 tt += (short_retries + 1) * ctsduration;
242 tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration);
243 tt += (long_retries+1)*ath_hal_computetxtime(sc->sc_ah, rt, length,
245 for (x = 0; x <= short_retries + long_retries; x++) {
246 cw = MIN(WIFI_CW_MAX, (cw + 1) * 2);
247 tt += (t_slot * cw/2);
251 #endif /* _DEV_ATH_RATE_SAMPLE_H */