1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2005 John Bicket 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer, 12 * without modification. 13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 15 * redistribution must be conditioned upon including a substantially 16 * similar Disclaimer requirement for further binary redistribution. 17 * 3. Neither the names of the above-listed copyright holders nor the names 18 * of any contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * Alternatively, this software may be distributed under the terms of the 22 * GNU General Public License ("GPL") version 2 as published by the Free 23 * Software Foundation. 24 * 25 * NO WARRANTY 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 28 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 29 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 30 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 31 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 34 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 36 * THE POSSIBILITY OF SUCH DAMAGES. 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 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 */ 54 int min_good_pct; /* min good percentage for a rate to be considered */ 55 }; 56 #define ATH_SOFTC_SAMPLE(sc) ((struct sample_softc *)sc->sc_rc) 57 58 struct rate_stats { 59 unsigned average_tx_time; 60 int successive_failures; 61 uint64_t tries; 62 uint64_t total_packets; /* pkts total since assoc */ 63 uint64_t packets_acked; /* pkts acked since assoc */ 64 int ewma_pct; /* EWMA percentage */ 65 unsigned perfect_tx_time; /* transmit time for 0 retries */ 66 int last_tx; 67 }; 68 69 struct txschedule { 70 uint8_t t0, r0; /* series 0: tries, rate code */ 71 uint8_t t1, r1; /* series 1: tries, rate code */ 72 uint8_t t2, r2; /* series 2: tries, rate code */ 73 uint8_t t3, r3; /* series 3: tries, rate code */ 74 }; 75 76 /* 77 * We track performance for eight different packet size buckets. 78 */ 79 #define NUM_PACKET_SIZE_BINS 7 80 81 static const int packet_size_bins[NUM_PACKET_SIZE_BINS] = { 250, 1600, 4096, 8192, 16384, 32768, 65536 }; 82 83 static inline int 84 bin_to_size(int index) 85 { 86 return packet_size_bins[index]; 87 } 88 89 /* per-node state */ 90 struct sample_node { 91 int static_rix; /* rate index of fixed tx rate */ 92 #define SAMPLE_MAXRATES 64 /* NB: corresponds to hal info[32] */ 93 uint64_t ratemask; /* bit mask of valid rate indices */ 94 const struct txschedule *sched; /* tx schedule table */ 95 96 const HAL_RATE_TABLE *currates; 97 98 struct rate_stats stats[NUM_PACKET_SIZE_BINS][SAMPLE_MAXRATES]; 99 int last_sample_rix[NUM_PACKET_SIZE_BINS]; 100 101 int current_sample_rix[NUM_PACKET_SIZE_BINS]; 102 int packets_sent[NUM_PACKET_SIZE_BINS]; 103 104 int current_rix[NUM_PACKET_SIZE_BINS]; 105 int packets_since_switch[NUM_PACKET_SIZE_BINS]; 106 int ticks_since_switch[NUM_PACKET_SIZE_BINS]; 107 108 int packets_since_sample[NUM_PACKET_SIZE_BINS]; 109 unsigned sample_tt[NUM_PACKET_SIZE_BINS]; 110 }; 111 112 #ifdef _KERNEL 113 114 #define ATH_NODE_SAMPLE(an) ((struct sample_node *)&(an)[1]) 115 #define IS_RATE_DEFINED(sn, rix) (((uint64_t) (sn)->ratemask & (1ULL<<((uint64_t) rix))) != 0) 116 117 #ifndef MIN 118 #define MIN(a,b) ((a) < (b) ? (a) : (b)) 119 #endif 120 #ifndef MAX 121 #define MAX(a,b) ((a) > (b) ? (a) : (b)) 122 #endif 123 124 #define WIFI_CW_MIN 31 125 #define WIFI_CW_MAX 1023 126 127 /* 128 * Calculate the transmit duration of a frame. 129 */ 130 static unsigned calc_usecs_unicast_packet(struct ath_softc *sc, 131 int length, 132 int rix, int short_retries, 133 int long_retries, int is_ht40) 134 { 135 const HAL_RATE_TABLE *rt = sc->sc_currates; 136 struct ieee80211com *ic = &sc->sc_ic; 137 int rts, cts; 138 139 unsigned t_slot = 20; 140 unsigned t_difs = 50; 141 unsigned t_sifs = 10; 142 int tt = 0; 143 int x = 0; 144 int cw = WIFI_CW_MIN; 145 int cix; 146 147 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode)); 148 149 if (rix >= rt->rateCount) { 150 printf("bogus rix %d, max %u, mode %u\n", 151 rix, rt->rateCount, sc->sc_curmode); 152 return 0; 153 } 154 cix = rt->info[rix].controlRate; 155 /* 156 * XXX getting mac/phy level timings should be fixed for turbo 157 * rates, and there is probably a way to get this from the 158 * hal... 159 */ 160 switch (rt->info[rix].phy) { 161 case IEEE80211_T_OFDM: 162 t_slot = 9; 163 t_sifs = 16; 164 t_difs = 28; 165 /* fall through */ 166 case IEEE80211_T_TURBO: 167 t_slot = 9; 168 t_sifs = 8; 169 t_difs = 28; 170 break; 171 case IEEE80211_T_HT: 172 t_slot = 9; 173 t_sifs = 8; 174 t_difs = 28; 175 break; 176 case IEEE80211_T_DS: 177 /* fall through to default */ 178 default: 179 /* pg 205 ieee.802.11.pdf */ 180 t_slot = 20; 181 t_difs = 50; 182 t_sifs = 10; 183 } 184 185 rts = cts = 0; 186 187 if ((ic->ic_flags & IEEE80211_F_USEPROT) && 188 rt->info[rix].phy == IEEE80211_T_OFDM) { 189 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) 190 rts = 1; 191 else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) 192 cts = 1; 193 194 cix = rt->info[sc->sc_protrix].controlRate; 195 } 196 197 if (0 /*length > ic->ic_rtsthreshold */) { 198 rts = 1; 199 } 200 201 if (rts || cts) { 202 int ctsrate; 203 int ctsduration = 0; 204 205 /* NB: this is intentionally not a runtime check */ 206 KASSERT(cix < rt->rateCount, 207 ("bogus cix %d, max %u, mode %u\n", cix, rt->rateCount, 208 sc->sc_curmode)); 209 210 ctsrate = rt->info[cix].rateCode | rt->info[cix].shortPreamble; 211 if (rts) /* SIFS + CTS */ 212 ctsduration += rt->info[cix].spAckDuration; 213 214 /* XXX assumes short preamble, include SIFS */ 215 ctsduration += ath_hal_pkt_txtime(sc->sc_ah, rt, length, rix, 216 is_ht40, 0, 1); 217 218 if (cts) /* SIFS + ACK */ 219 ctsduration += rt->info[cix].spAckDuration; 220 221 tt += (short_retries + 1) * ctsduration; 222 } 223 tt += t_difs; 224 225 /* XXX assumes short preamble, include SIFS */ 226 tt += (long_retries+1)*ath_hal_pkt_txtime(sc->sc_ah, rt, length, rix, 227 is_ht40, 0, 1); 228 229 tt += (long_retries+1)*(t_sifs + rt->info[rix].spAckDuration); 230 231 for (x = 0; x <= short_retries + long_retries; x++) { 232 cw = MIN(WIFI_CW_MAX, (cw + 1) * 2); 233 tt += (t_slot * cw/2); 234 } 235 return tt; 236 } 237 238 #endif /* _KERNEL */ 239 240 #endif /* _DEV_ATH_RATE_SAMPLE_H */ 241