1 /*- 2 * Copyright (c) 2005 John Bicket 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer, 10 * without modification. 11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 13 * redistribution must be conditioned upon including a substantially 14 * similar Disclaimer requirement for further binary redistribution. 15 * 3. Neither the names of the above-listed copyright holders nor the names 16 * of any contributors may be used to endorse or promote products derived 17 * from this software without specific prior written permission. 18 * 19 * Alternatively, this software may be distributed under the terms of the 20 * GNU General Public License ("GPL") version 2 as published by the Free 21 * Software Foundation. 22 * 23 * NO WARRANTY 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 26 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 27 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 28 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 29 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 32 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 34 * THE POSSIBILITY OF SUCH DAMAGES. 35 * 36 * $FreeBSD$ 37 */ 38 39 /* 40 * Defintions for the Atheros Wireless LAN controller driver. 41 */ 42 #ifndef _DEV_ATH_RATE_SAMPLE_H 43 #define _DEV_ATH_RATE_SAMPLE_H 44 45 /* per-device state */ 46 struct sample_softc { 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 */ 50 }; 51 #define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc) 52 53 struct rate_info { 54 int rate; 55 int rix; 56 int rateCode; 57 int shortPreambleRateCode; 58 }; 59 60 61 struct rate_stats { 62 unsigned average_tx_time; 63 int successive_failures; 64 int tries; 65 int total_packets; 66 int packets_acked; 67 unsigned perfect_tx_time; /* transmit time for 0 retries */ 68 int last_tx; 69 }; 70 71 /* 72 * for now, we track performance for three different packet 73 * size buckets 74 */ 75 #define NUM_PACKET_SIZE_BINS 3 76 static int packet_size_bins[NUM_PACKET_SIZE_BINS] = {250, 1600, 3000}; 77 78 /* per-node state */ 79 struct sample_node { 80 int static_rate_ndx; 81 int num_rates; 82 83 struct rate_info rates[IEEE80211_RATE_MAXSIZE]; 84 85 struct rate_stats stats[NUM_PACKET_SIZE_BINS][IEEE80211_RATE_MAXSIZE]; 86 int last_sample_ndx[NUM_PACKET_SIZE_BINS]; 87 88 int current_sample_ndx[NUM_PACKET_SIZE_BINS]; 89 int packets_sent[NUM_PACKET_SIZE_BINS]; 90 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]; 94 95 int packets_since_sample[NUM_PACKET_SIZE_BINS]; 96 unsigned sample_tt[NUM_PACKET_SIZE_BINS]; 97 }; 98 #define ATH_NODE_SAMPLE(an) ((struct sample_node *)&an[1]) 99 100 #ifndef MIN 101 #define MIN(a,b) ((a) < (b) ? (a) : (b)) 102 #endif 103 #ifndef MAX 104 #define MAX(a,b) ((a) > (b) ? (a) : (b)) 105 #endif 106 107 #define WIFI_CW_MIN 31 108 #define WIFI_CW_MAX 1023 109 110 /* 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. 115 */ 116 #define ds_ctl2 ds_hw[0] 117 #define ds_ctl3 ds_hw[1] 118 119 /* TX ds_ctl2 */ 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 28 128 129 /* TX ds_ctl3 */ 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 15 138 139 #define MS(_v, _f) (((_v) & (_f)) >> _f##_S) 140 141 /* 142 * Calculate the transmit duration of a frame. 143 */ 144 static unsigned calc_usecs_unicast_packet(struct ath_softc *sc, 145 int length, 146 int rix, int short_retries, int long_retries) { 147 const HAL_RATE_TABLE *rt = sc->sc_currates; 148 int rts, cts; 149 150 unsigned t_slot = 20; 151 unsigned t_difs = 50; 152 unsigned t_sifs = 10; 153 struct ieee80211com *ic = &sc->sc_ic; 154 int tt = 0; 155 int x = 0; 156 int cw = WIFI_CW_MIN; 157 int cix; 158 159 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode)); 160 161 if (rix >= rt->rateCount) { 162 printf("bogus rix %d, max %u, mode %u\n", 163 rix, rt->rateCount, sc->sc_curmode); 164 return 0; 165 } 166 cix = rt->info[rix].controlRate; 167 /* 168 * XXX getting mac/phy level timings should be fixed for turbo 169 * rates, and there is probably a way to get this from the 170 * hal... 171 */ 172 switch (rt->info[rix].phy) { 173 case IEEE80211_T_OFDM: 174 t_slot = 9; 175 t_sifs = 16; 176 t_difs = 28; 177 /* fall through */ 178 case IEEE80211_T_TURBO: 179 t_slot = 9; 180 t_sifs = 8; 181 t_difs = 28; 182 break; 183 case IEEE80211_T_DS: 184 /* fall through to default */ 185 default: 186 /* pg 205 ieee.802.11.pdf */ 187 t_slot = 20; 188 t_difs = 50; 189 t_sifs = 10; 190 } 191 192 rts = cts = 0; 193 194 if ((ic->ic_flags & IEEE80211_F_USEPROT) && 195 rt->info[rix].phy == IEEE80211_T_OFDM) { 196 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) 197 rts = 1; 198 else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) 199 cts = 1; 200 201 cix = rt->info[sc->sc_protrix].controlRate; 202 203 } 204 205 if (0 /*length > ic->ic_rtsthreshold */) { 206 rts = 1; 207 } 208 209 if (rts || cts) { 210 int ctsrate; 211 int ctsduration = 0; 212 213 /* NB: this is intentionally not a runtime check */ 214 KASSERT(cix < rt->rateCount, 215 ("bogus cix %d, max %u, mode %u\n", cix, rt->rateCount, 216 sc->sc_curmode)); 217 218 ctsrate = rt->info[cix].rateCode | rt->info[cix].shortPreamble; 219 if (rts) /* SIFS + CTS */ 220 ctsduration += rt->info[cix].spAckDuration; 221 222 ctsduration += ath_hal_computetxtime(sc->sc_ah, 223 rt, length, rix, AH_TRUE); 224 225 if (cts) /* SIFS + ACK */ 226 ctsduration += rt->info[cix].spAckDuration; 227 228 tt += (short_retries + 1) * ctsduration; 229 } 230 tt += t_difs; 231 tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration); 232 tt += (long_retries+1)*ath_hal_computetxtime(sc->sc_ah, rt, length, 233 rix, AH_TRUE); 234 for (x = 0; x <= short_retries + long_retries; x++) { 235 cw = MIN(WIFI_CW_MAX, (cw + 1) * 2); 236 tt += (t_slot * cw/2); 237 } 238 return tt; 239 } 240 #endif /* _DEV_ATH_RATE_SAMPLE_H */ 241