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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 state */
48 int ath_smoothing_rate; /* ewma percentage (out of 100) */
49 int ath_sample_rate; /* send a different bit-rate 1/X packets */
51 #define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc)
57 int shortPreambleRateCode;
62 unsigned average_tx_time;
63 int successive_failures;
67 unsigned perfect_tx_time; /* transmit time for 0 retries */
72 * for now, we track performance for three different packet
75 #define NUM_PACKET_SIZE_BINS 3
76 static int packet_size_bins[NUM_PACKET_SIZE_BINS] = {250, 1600, 3000};
83 struct rate_info rates[IEEE80211_RATE_MAXSIZE];
85 struct rate_stats stats[NUM_PACKET_SIZE_BINS][IEEE80211_RATE_MAXSIZE];
86 int last_sample_ndx[NUM_PACKET_SIZE_BINS];
88 int current_sample_ndx[NUM_PACKET_SIZE_BINS];
89 int packets_sent[NUM_PACKET_SIZE_BINS];
91 int current_rate[NUM_PACKET_SIZE_BINS];
92 int packets_since_switch[NUM_PACKET_SIZE_BINS];
93 unsigned ticks_since_switch[NUM_PACKET_SIZE_BINS];
95 int packets_since_sample[NUM_PACKET_SIZE_BINS];
96 unsigned sample_tt[NUM_PACKET_SIZE_BINS];
98 #define ATH_NODE_SAMPLE(an) ((struct sample_node *)&an[1])
101 #define MIN(a,b) ((a) < (b) ? (a) : (b))
104 #define MAX(a,b) ((a) > (b) ? (a) : (b))
107 #define WIFI_CW_MIN 31
108 #define WIFI_CW_MAX 1023
111 * Definitions for pulling the rate and trie counts from
112 * a 5212 h/w descriptor. These Don't belong here; the
113 * driver should record this information so the rate control
114 * code doesn't go groveling around in the descriptor bits.
116 #define ds_ctl2 ds_hw[0]
117 #define ds_ctl3 ds_hw[1]
120 #define AR_XmitDataTries0 0x000f0000 /* series 0 max attempts */
121 #define AR_XmitDataTries0_S 16
122 #define AR_XmitDataTries1 0x00f00000 /* series 1 max attempts */
123 #define AR_XmitDataTries1_S 20
124 #define AR_XmitDataTries2 0x0f000000 /* series 2 max attempts */
125 #define AR_XmitDataTries2_S 24
126 #define AR_XmitDataTries3 0xf0000000 /* series 3 max attempts */
127 #define AR_XmitDataTries3_S 28
130 #define AR_XmitRate0 0x0000001f /* series 0 tx rate */
131 #define AR_XmitRate0_S 0
132 #define AR_XmitRate1 0x000003e0 /* series 1 tx rate */
133 #define AR_XmitRate1_S 5
134 #define AR_XmitRate2 0x00007c00 /* series 2 tx rate */
135 #define AR_XmitRate2_S 10
136 #define AR_XmitRate3 0x000f8000 /* series 3 tx rate */
137 #define AR_XmitRate3_S 15
139 /* TX ds_ctl3 for 5416 */
140 #define AR5416_XmitRate0 0x000000ff /* series 0 tx rate */
141 #define AR5416_XmitRate0_S 0
142 #define AR5416_XmitRate1 0x0000ff00 /* series 1 tx rate */
143 #define AR5416_XmitRate1_S 8
144 #define AR5416_XmitRate2 0x00ff0000 /* series 2 tx rate */
145 #define AR5416_XmitRate2_S 16
146 #define AR5416_XmitRate3 0xff000000 /* series 3 tx rate */
147 #define AR5416_XmitRate3_S 24
149 #define MS(_v, _f) (((_v) & (_f)) >> _f##_S)
152 * Calculate the transmit duration of a frame.
154 static unsigned calc_usecs_unicast_packet(struct ath_softc *sc,
156 int rix, int short_retries, int long_retries) {
157 const HAL_RATE_TABLE *rt = sc->sc_currates;
160 unsigned t_slot = 20;
161 unsigned t_difs = 50;
162 unsigned t_sifs = 10;
163 struct ieee80211com *ic = &sc->sc_ic;
166 int cw = WIFI_CW_MIN;
169 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
171 if (rix >= rt->rateCount) {
172 printf("bogus rix %d, max %u, mode %u\n",
173 rix, rt->rateCount, sc->sc_curmode);
176 cix = rt->info[rix].controlRate;
178 * XXX getting mac/phy level timings should be fixed for turbo
179 * rates, and there is probably a way to get this from the
182 switch (rt->info[rix].phy) {
183 case IEEE80211_T_OFDM:
188 case IEEE80211_T_TURBO:
194 /* fall through to default */
196 /* pg 205 ieee.802.11.pdf */
204 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
205 rt->info[rix].phy == IEEE80211_T_OFDM) {
206 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS)
208 else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY)
211 cix = rt->info[sc->sc_protrix].controlRate;
215 if (0 /*length > ic->ic_rtsthreshold */) {
223 /* NB: this is intentionally not a runtime check */
224 KASSERT(cix < rt->rateCount,
225 ("bogus cix %d, max %u, mode %u\n", cix, rt->rateCount,
228 ctsrate = rt->info[cix].rateCode | rt->info[cix].shortPreamble;
229 if (rts) /* SIFS + CTS */
230 ctsduration += rt->info[cix].spAckDuration;
232 ctsduration += ath_hal_computetxtime(sc->sc_ah,
233 rt, length, rix, AH_TRUE);
235 if (cts) /* SIFS + ACK */
236 ctsduration += rt->info[cix].spAckDuration;
238 tt += (short_retries + 1) * ctsduration;
241 tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration);
242 tt += (long_retries+1)*ath_hal_computetxtime(sc->sc_ah, rt, length,
244 for (x = 0; x <= short_retries + long_retries; x++) {
245 cw = MIN(WIFI_CW_MAX, (cw + 1) * 2);
246 tt += (t_slot * cw/2);
250 #endif /* _DEV_ATH_RATE_SAMPLE_H */