Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1 | /* |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 2 | * Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org> |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | #include <linux/netdevice.h> |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/skbuff.h> |
| 11 | #include <linux/debugfs.h> |
| 12 | #include <linux/random.h> |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 13 | #include <linux/moduleparam.h> |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 14 | #include <linux/ieee80211.h> |
| 15 | #include <net/mac80211.h> |
| 16 | #include "rate.h" |
| 17 | #include "rc80211_minstrel.h" |
| 18 | #include "rc80211_minstrel_ht.h" |
| 19 | |
Felix Fietkau | d66c258 | 2015-03-13 10:54:44 +0100 | [diff] [blame] | 20 | #define AVG_AMPDU_SIZE 16 |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 21 | #define AVG_PKT_SIZE 1200 |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 22 | |
| 23 | /* Number of bits for an average sized packet */ |
Felix Fietkau | d66c258 | 2015-03-13 10:54:44 +0100 | [diff] [blame] | 24 | #define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_SIZE) << 3) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 25 | |
| 26 | /* Number of symbols for a packet with (bps) bits per symbol */ |
Johannes Berg | 00591ce | 2014-05-19 11:24:19 +0200 | [diff] [blame] | 27 | #define MCS_NSYMS(bps) DIV_ROUND_UP(MCS_NBITS, (bps)) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 28 | |
Felix Fietkau | ed97a13 | 2013-03-02 21:20:12 +0100 | [diff] [blame] | 29 | /* Transmission time (nanoseconds) for a packet containing (syms) symbols */ |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 30 | #define MCS_SYMBOL_TIME(sgi, syms) \ |
| 31 | (sgi ? \ |
Felix Fietkau | ed97a13 | 2013-03-02 21:20:12 +0100 | [diff] [blame] | 32 | ((syms) * 18000 + 4000) / 5 : /* syms * 3.6 us */ \ |
| 33 | ((syms) * 1000) << 2 /* syms * 4 us */ \ |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 34 | ) |
| 35 | |
| 36 | /* Transmit duration for the raw data part of an average sized packet */ |
Felix Fietkau | d66c258 | 2015-03-13 10:54:44 +0100 | [diff] [blame] | 37 | #define MCS_DURATION(streams, sgi, bps) \ |
| 38 | (MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps))) / AVG_AMPDU_SIZE) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 39 | |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 40 | #define BW_20 0 |
| 41 | #define BW_40 1 |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 42 | #define BW_80 2 |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 43 | |
Helmut Schaa | a5f69d94 | 2011-11-14 15:28:20 +0100 | [diff] [blame] | 44 | /* |
| 45 | * Define group sort order: HT40 -> SGI -> #streams |
| 46 | */ |
| 47 | #define GROUP_IDX(_streams, _sgi, _ht40) \ |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 48 | MINSTREL_HT_GROUP_0 + \ |
Helmut Schaa | a5f69d94 | 2011-11-14 15:28:20 +0100 | [diff] [blame] | 49 | MINSTREL_MAX_STREAMS * 2 * _ht40 + \ |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 50 | MINSTREL_MAX_STREAMS * _sgi + \ |
Helmut Schaa | a5f69d94 | 2011-11-14 15:28:20 +0100 | [diff] [blame] | 51 | _streams - 1 |
| 52 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 53 | /* MCS rate information for an MCS group */ |
Helmut Schaa | a5f69d94 | 2011-11-14 15:28:20 +0100 | [diff] [blame] | 54 | #define MCS_GROUP(_streams, _sgi, _ht40) \ |
| 55 | [GROUP_IDX(_streams, _sgi, _ht40)] = { \ |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 56 | .streams = _streams, \ |
| 57 | .flags = \ |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 58 | IEEE80211_TX_RC_MCS | \ |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 59 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ |
| 60 | (_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ |
| 61 | .duration = { \ |
| 62 | MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26), \ |
| 63 | MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52), \ |
| 64 | MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78), \ |
| 65 | MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104), \ |
| 66 | MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156), \ |
| 67 | MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208), \ |
| 68 | MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234), \ |
| 69 | MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) \ |
| 70 | } \ |
| 71 | } |
| 72 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 73 | #define VHT_GROUP_IDX(_streams, _sgi, _bw) \ |
| 74 | (MINSTREL_VHT_GROUP_0 + \ |
| 75 | MINSTREL_MAX_STREAMS * 2 * (_bw) + \ |
| 76 | MINSTREL_MAX_STREAMS * (_sgi) + \ |
| 77 | (_streams) - 1) |
| 78 | |
| 79 | #define BW2VBPS(_bw, r3, r2, r1) \ |
| 80 | (_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1) |
| 81 | |
| 82 | #define VHT_GROUP(_streams, _sgi, _bw) \ |
| 83 | [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \ |
| 84 | .streams = _streams, \ |
| 85 | .flags = \ |
| 86 | IEEE80211_TX_RC_VHT_MCS | \ |
| 87 | (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \ |
| 88 | (_bw == BW_80 ? IEEE80211_TX_RC_80_MHZ_WIDTH : \ |
| 89 | _bw == BW_40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \ |
| 90 | .duration = { \ |
| 91 | MCS_DURATION(_streams, _sgi, \ |
| 92 | BW2VBPS(_bw, 117, 54, 26)), \ |
| 93 | MCS_DURATION(_streams, _sgi, \ |
| 94 | BW2VBPS(_bw, 234, 108, 52)), \ |
| 95 | MCS_DURATION(_streams, _sgi, \ |
| 96 | BW2VBPS(_bw, 351, 162, 78)), \ |
| 97 | MCS_DURATION(_streams, _sgi, \ |
| 98 | BW2VBPS(_bw, 468, 216, 104)), \ |
| 99 | MCS_DURATION(_streams, _sgi, \ |
| 100 | BW2VBPS(_bw, 702, 324, 156)), \ |
| 101 | MCS_DURATION(_streams, _sgi, \ |
| 102 | BW2VBPS(_bw, 936, 432, 208)), \ |
| 103 | MCS_DURATION(_streams, _sgi, \ |
| 104 | BW2VBPS(_bw, 1053, 486, 234)), \ |
| 105 | MCS_DURATION(_streams, _sgi, \ |
| 106 | BW2VBPS(_bw, 1170, 540, 260)), \ |
| 107 | MCS_DURATION(_streams, _sgi, \ |
| 108 | BW2VBPS(_bw, 1404, 648, 312)), \ |
| 109 | MCS_DURATION(_streams, _sgi, \ |
| 110 | BW2VBPS(_bw, 1560, 720, 346)) \ |
| 111 | } \ |
| 112 | } |
| 113 | |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 114 | #define CCK_DURATION(_bitrate, _short, _len) \ |
Felix Fietkau | ed97a13 | 2013-03-02 21:20:12 +0100 | [diff] [blame] | 115 | (1000 * (10 /* SIFS */ + \ |
Weilong Chen | f359d3f | 2013-12-18 15:44:16 +0800 | [diff] [blame] | 116 | (_short ? 72 + 24 : 144 + 48) + \ |
Felix Fietkau | ed97a13 | 2013-03-02 21:20:12 +0100 | [diff] [blame] | 117 | (8 * (_len + 4) * 10) / (_bitrate))) |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 118 | |
| 119 | #define CCK_ACK_DURATION(_bitrate, _short) \ |
| 120 | (CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \ |
| 121 | CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE)) |
| 122 | |
| 123 | #define CCK_DURATION_LIST(_short) \ |
| 124 | CCK_ACK_DURATION(10, _short), \ |
| 125 | CCK_ACK_DURATION(20, _short), \ |
| 126 | CCK_ACK_DURATION(55, _short), \ |
| 127 | CCK_ACK_DURATION(110, _short) |
| 128 | |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 129 | #define CCK_GROUP \ |
| 130 | [MINSTREL_CCK_GROUP] = { \ |
| 131 | .streams = 0, \ |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 132 | .flags = 0, \ |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 133 | .duration = { \ |
| 134 | CCK_DURATION_LIST(false), \ |
| 135 | CCK_DURATION_LIST(true) \ |
| 136 | } \ |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 137 | } |
| 138 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 139 | #ifdef CONFIG_MAC80211_RC_MINSTREL_VHT |
| 140 | static bool minstrel_vht_only = true; |
| 141 | module_param(minstrel_vht_only, bool, 0644); |
| 142 | MODULE_PARM_DESC(minstrel_vht_only, |
| 143 | "Use only VHT rates when VHT is supported by sta."); |
| 144 | #endif |
| 145 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 146 | /* |
| 147 | * To enable sufficiently targeted rate sampling, MCS rates are divided into |
| 148 | * groups, based on the number of streams and flags (HT40, SGI) that they |
| 149 | * use. |
Helmut Schaa | a5f69d94 | 2011-11-14 15:28:20 +0100 | [diff] [blame] | 150 | * |
| 151 | * Sortorder has to be fixed for GROUP_IDX macro to be applicable: |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 152 | * BW -> SGI -> #streams |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 153 | */ |
| 154 | const struct mcs_group minstrel_mcs_groups[] = { |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 155 | MCS_GROUP(1, 0, BW_20), |
| 156 | MCS_GROUP(2, 0, BW_20), |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 157 | #if MINSTREL_MAX_STREAMS >= 3 |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 158 | MCS_GROUP(3, 0, BW_20), |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 159 | #endif |
| 160 | |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 161 | MCS_GROUP(1, 1, BW_20), |
| 162 | MCS_GROUP(2, 1, BW_20), |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 163 | #if MINSTREL_MAX_STREAMS >= 3 |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 164 | MCS_GROUP(3, 1, BW_20), |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 165 | #endif |
| 166 | |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 167 | MCS_GROUP(1, 0, BW_40), |
| 168 | MCS_GROUP(2, 0, BW_40), |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 169 | #if MINSTREL_MAX_STREAMS >= 3 |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 170 | MCS_GROUP(3, 0, BW_40), |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 171 | #endif |
| 172 | |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 173 | MCS_GROUP(1, 1, BW_40), |
| 174 | MCS_GROUP(2, 1, BW_40), |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 175 | #if MINSTREL_MAX_STREAMS >= 3 |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 176 | MCS_GROUP(3, 1, BW_40), |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 177 | #endif |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 178 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 179 | CCK_GROUP, |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 180 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 181 | #ifdef CONFIG_MAC80211_RC_MINSTREL_VHT |
| 182 | VHT_GROUP(1, 0, BW_20), |
| 183 | VHT_GROUP(2, 0, BW_20), |
| 184 | #if MINSTREL_MAX_STREAMS >= 3 |
| 185 | VHT_GROUP(3, 0, BW_20), |
| 186 | #endif |
| 187 | |
| 188 | VHT_GROUP(1, 1, BW_20), |
| 189 | VHT_GROUP(2, 1, BW_20), |
| 190 | #if MINSTREL_MAX_STREAMS >= 3 |
| 191 | VHT_GROUP(3, 1, BW_20), |
| 192 | #endif |
| 193 | |
| 194 | VHT_GROUP(1, 0, BW_40), |
| 195 | VHT_GROUP(2, 0, BW_40), |
| 196 | #if MINSTREL_MAX_STREAMS >= 3 |
| 197 | VHT_GROUP(3, 0, BW_40), |
| 198 | #endif |
| 199 | |
| 200 | VHT_GROUP(1, 1, BW_40), |
| 201 | VHT_GROUP(2, 1, BW_40), |
| 202 | #if MINSTREL_MAX_STREAMS >= 3 |
| 203 | VHT_GROUP(3, 1, BW_40), |
| 204 | #endif |
| 205 | |
| 206 | VHT_GROUP(1, 0, BW_80), |
| 207 | VHT_GROUP(2, 0, BW_80), |
| 208 | #if MINSTREL_MAX_STREAMS >= 3 |
| 209 | VHT_GROUP(3, 0, BW_80), |
| 210 | #endif |
| 211 | |
| 212 | VHT_GROUP(1, 1, BW_80), |
| 213 | VHT_GROUP(2, 1, BW_80), |
| 214 | #if MINSTREL_MAX_STREAMS >= 3 |
| 215 | VHT_GROUP(3, 1, BW_80), |
| 216 | #endif |
| 217 | #endif |
| 218 | }; |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 219 | |
Johannes Berg | f6e1a73 | 2014-01-21 00:32:52 +0100 | [diff] [blame] | 220 | static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 221 | |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 222 | static void |
| 223 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi); |
| 224 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 225 | /* |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 226 | * Some VHT MCSes are invalid (when Ndbps / Nes is not an integer) |
| 227 | * e.g for MCS9@20MHzx1Nss: Ndbps=8x52*(5/6) Nes=1 |
| 228 | * |
| 229 | * Returns the valid mcs map for struct minstrel_mcs_group_data.supported |
| 230 | */ |
| 231 | static u16 |
| 232 | minstrel_get_valid_vht_rates(int bw, int nss, __le16 mcs_map) |
| 233 | { |
| 234 | u16 mask = 0; |
| 235 | |
| 236 | if (bw == BW_20) { |
| 237 | if (nss != 3 && nss != 6) |
| 238 | mask = BIT(9); |
| 239 | } else if (bw == BW_80) { |
| 240 | if (nss == 3 || nss == 7) |
| 241 | mask = BIT(6); |
| 242 | else if (nss == 6) |
| 243 | mask = BIT(9); |
| 244 | } else { |
| 245 | WARN_ON(bw != BW_40); |
| 246 | } |
| 247 | |
| 248 | switch ((le16_to_cpu(mcs_map) >> (2 * (nss - 1))) & 3) { |
| 249 | case IEEE80211_VHT_MCS_SUPPORT_0_7: |
| 250 | mask |= 0x300; |
| 251 | break; |
| 252 | case IEEE80211_VHT_MCS_SUPPORT_0_8: |
| 253 | mask |= 0x200; |
| 254 | break; |
| 255 | case IEEE80211_VHT_MCS_SUPPORT_0_9: |
| 256 | break; |
| 257 | default: |
| 258 | mask = 0x3ff; |
| 259 | } |
| 260 | |
| 261 | return 0x3ff & ~mask; |
| 262 | } |
| 263 | |
| 264 | /* |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 265 | * Look up an MCS group index based on mac80211 rate information |
| 266 | */ |
| 267 | static int |
| 268 | minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate) |
| 269 | { |
Karl Beldan | cc61d8d | 2014-09-29 02:36:30 +0200 | [diff] [blame] | 270 | return GROUP_IDX((rate->idx / 8) + 1, |
Helmut Schaa | a5f69d94 | 2011-11-14 15:28:20 +0100 | [diff] [blame] | 271 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
| 272 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 273 | } |
| 274 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 275 | static int |
| 276 | minstrel_vht_get_group_idx(struct ieee80211_tx_rate *rate) |
| 277 | { |
| 278 | return VHT_GROUP_IDX(ieee80211_rate_get_vht_nss(rate), |
| 279 | !!(rate->flags & IEEE80211_TX_RC_SHORT_GI), |
| 280 | !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) + |
| 281 | 2*!!(rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)); |
| 282 | } |
| 283 | |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 284 | static struct minstrel_rate_stats * |
| 285 | minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
| 286 | struct ieee80211_tx_rate *rate) |
| 287 | { |
| 288 | int group, idx; |
| 289 | |
| 290 | if (rate->flags & IEEE80211_TX_RC_MCS) { |
| 291 | group = minstrel_ht_get_group_idx(rate); |
Karl Beldan | 7a5e3fa | 2013-11-11 13:12:55 +0100 | [diff] [blame] | 292 | idx = rate->idx % 8; |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 293 | } else if (rate->flags & IEEE80211_TX_RC_VHT_MCS) { |
| 294 | group = minstrel_vht_get_group_idx(rate); |
| 295 | idx = ieee80211_rate_get_vht_mcs(rate); |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 296 | } else { |
| 297 | group = MINSTREL_CCK_GROUP; |
| 298 | |
| 299 | for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) |
| 300 | if (rate->idx == mp->cck_rates[idx]) |
| 301 | break; |
| 302 | |
| 303 | /* short preamble */ |
| 304 | if (!(mi->groups[group].supported & BIT(idx))) |
| 305 | idx += 4; |
| 306 | } |
| 307 | return &mi->groups[group].rates[idx]; |
| 308 | } |
| 309 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 310 | static inline struct minstrel_rate_stats * |
| 311 | minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index) |
| 312 | { |
| 313 | return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES]; |
| 314 | } |
| 315 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 316 | /* |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 317 | * Return current throughput based on the average A-MPDU length, taking into |
| 318 | * account the expected number of retransmissions and their expected length |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 319 | */ |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 320 | int |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 321 | minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate, |
| 322 | int prob_ewma) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 323 | { |
Felix Fietkau | ed97a13 | 2013-03-02 21:20:12 +0100 | [diff] [blame] | 324 | unsigned int nsecs = 0; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 325 | |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 326 | /* do not account throughput if sucess prob is below 10% */ |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 327 | if (prob_ewma < MINSTREL_FRAC(10, 100)) |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 328 | return 0; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 329 | |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 330 | if (group != MINSTREL_CCK_GROUP) |
Felix Fietkau | ed97a13 | 2013-03-02 21:20:12 +0100 | [diff] [blame] | 331 | nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len); |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 332 | |
Felix Fietkau | ed97a13 | 2013-03-02 21:20:12 +0100 | [diff] [blame] | 333 | nsecs += minstrel_mcs_groups[group].duration[rate]; |
Felix Fietkau | ed97a13 | 2013-03-02 21:20:12 +0100 | [diff] [blame] | 334 | |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 335 | /* |
| 336 | * For the throughput calculation, limit the probability value to 90% to |
| 337 | * account for collision related packet error rate fluctuation |
| 338 | * (prob is scaled - see MINSTREL_FRAC above) |
| 339 | */ |
| 340 | if (prob_ewma > MINSTREL_FRAC(90, 100)) |
| 341 | return MINSTREL_TRUNC(100000 * ((MINSTREL_FRAC(90, 100) * 1000) |
| 342 | / nsecs)); |
| 343 | else |
| 344 | return MINSTREL_TRUNC(100000 * ((prob_ewma * 1000) / nsecs)); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /* |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 348 | * Find & sort topmost throughput rates |
| 349 | * |
| 350 | * If multiple rates provide equal throughput the sorting is based on their |
| 351 | * current success probability. Higher success probability is preferred among |
| 352 | * MCS groups, CCK rates do not provide aggregation and are therefore at last. |
| 353 | */ |
| 354 | static void |
Karl Beldan | d4d141c | 2014-10-20 15:45:59 +0200 | [diff] [blame] | 355 | minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u16 index, |
| 356 | u16 *tp_list) |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 357 | { |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 358 | int cur_group, cur_idx, cur_tp_avg, cur_prob; |
| 359 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 360 | int j = MAX_THR_RATES; |
| 361 | |
| 362 | cur_group = index / MCS_GROUP_RATES; |
| 363 | cur_idx = index % MCS_GROUP_RATES; |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 364 | cur_prob = mi->groups[cur_group].rates[cur_idx].prob_ewma; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 365 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, cur_prob); |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 366 | |
Felix Fietkau | 280ba51 | 2014-11-18 22:35:31 +0100 | [diff] [blame] | 367 | do { |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 368 | tmp_group = tp_list[j - 1] / MCS_GROUP_RATES; |
| 369 | tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES; |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 370 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 371 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, |
| 372 | tmp_prob); |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 373 | if (cur_tp_avg < tmp_tp_avg || |
| 374 | (cur_tp_avg == tmp_tp_avg && cur_prob <= tmp_prob)) |
Felix Fietkau | 280ba51 | 2014-11-18 22:35:31 +0100 | [diff] [blame] | 375 | break; |
| 376 | j--; |
| 377 | } while (j > 0); |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 378 | |
| 379 | if (j < MAX_THR_RATES - 1) { |
| 380 | memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) * |
| 381 | (MAX_THR_RATES - (j + 1)))); |
| 382 | } |
| 383 | if (j < MAX_THR_RATES) |
| 384 | tp_list[j] = index; |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * Find and set the topmost probability rate per sta and per group |
| 389 | */ |
| 390 | static void |
Karl Beldan | d4d141c | 2014-10-20 15:45:59 +0200 | [diff] [blame] | 391 | minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 index) |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 392 | { |
| 393 | struct minstrel_mcs_group_data *mg; |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 394 | struct minstrel_rate_stats *mrs; |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 395 | int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob; |
| 396 | int max_tp_group, cur_tp_avg, cur_group, cur_idx; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 397 | int max_gpr_group, max_gpr_idx; |
| 398 | int max_gpr_tp_avg, max_gpr_prob; |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 399 | |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 400 | cur_group = index / MCS_GROUP_RATES; |
| 401 | cur_idx = index % MCS_GROUP_RATES; |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 402 | mg = &mi->groups[index / MCS_GROUP_RATES]; |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 403 | mrs = &mg->rates[index % MCS_GROUP_RATES]; |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 404 | |
| 405 | tmp_group = mi->max_prob_rate / MCS_GROUP_RATES; |
| 406 | tmp_idx = mi->max_prob_rate % MCS_GROUP_RATES; |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 407 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 408 | tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 409 | |
| 410 | /* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from |
| 411 | * MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */ |
| 412 | max_tp_group = mi->max_tp_rate[0] / MCS_GROUP_RATES; |
| 413 | if((index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) && |
| 414 | (max_tp_group != MINSTREL_CCK_GROUP)) |
| 415 | return; |
| 416 | |
Konstantin Khlebnikov | f84a937 | 2016-01-29 11:35:12 +0300 | [diff] [blame] | 417 | max_gpr_group = mg->max_group_prob_rate / MCS_GROUP_RATES; |
| 418 | max_gpr_idx = mg->max_group_prob_rate % MCS_GROUP_RATES; |
| 419 | max_gpr_prob = mi->groups[max_gpr_group].rates[max_gpr_idx].prob_ewma; |
| 420 | |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 421 | if (mrs->prob_ewma > MINSTREL_FRAC(75, 100)) { |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 422 | cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, |
| 423 | mrs->prob_ewma); |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 424 | if (cur_tp_avg > tmp_tp_avg) |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 425 | mi->max_prob_rate = index; |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 426 | |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 427 | max_gpr_tp_avg = minstrel_ht_get_tp_avg(mi, max_gpr_group, |
| 428 | max_gpr_idx, |
| 429 | max_gpr_prob); |
| 430 | if (cur_tp_avg > max_gpr_tp_avg) |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 431 | mg->max_group_prob_rate = index; |
| 432 | } else { |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 433 | if (mrs->prob_ewma > tmp_prob) |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 434 | mi->max_prob_rate = index; |
Konstantin Khlebnikov | f84a937 | 2016-01-29 11:35:12 +0300 | [diff] [blame] | 435 | if (mrs->prob_ewma > max_gpr_prob) |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 436 | mg->max_group_prob_rate = index; |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | |
| 441 | /* |
| 442 | * Assign new rate set per sta and use CCK rates only if the fastest |
| 443 | * rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted |
| 444 | * rate sets where MCS and CCK rates are mixed, because CCK rates can |
| 445 | * not use aggregation. |
| 446 | */ |
| 447 | static void |
| 448 | minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi, |
Karl Beldan | d4d141c | 2014-10-20 15:45:59 +0200 | [diff] [blame] | 449 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], |
| 450 | u16 tmp_cck_tp_rate[MAX_THR_RATES]) |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 451 | { |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 452 | unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp, tmp_prob; |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 453 | int i; |
| 454 | |
| 455 | tmp_group = tmp_cck_tp_rate[0] / MCS_GROUP_RATES; |
| 456 | tmp_idx = tmp_cck_tp_rate[0] % MCS_GROUP_RATES; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 457 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
| 458 | tmp_cck_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 459 | |
| 460 | tmp_group = tmp_mcs_tp_rate[0] / MCS_GROUP_RATES; |
| 461 | tmp_idx = tmp_mcs_tp_rate[0] % MCS_GROUP_RATES; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 462 | tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma; |
| 463 | tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob); |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 464 | |
| 465 | if (tmp_cck_tp > tmp_mcs_tp) { |
| 466 | for(i = 0; i < MAX_THR_RATES; i++) { |
| 467 | minstrel_ht_sort_best_tp_rates(mi, tmp_cck_tp_rate[i], |
| 468 | tmp_mcs_tp_rate); |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Try to increase robustness of max_prob rate by decrease number of |
| 476 | * streams if possible. |
| 477 | */ |
| 478 | static inline void |
| 479 | minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi) |
| 480 | { |
| 481 | struct minstrel_mcs_group_data *mg; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 482 | int tmp_max_streams, group, tmp_idx, tmp_prob; |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 483 | int tmp_tp = 0; |
| 484 | |
| 485 | tmp_max_streams = minstrel_mcs_groups[mi->max_tp_rate[0] / |
| 486 | MCS_GROUP_RATES].streams; |
| 487 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { |
| 488 | mg = &mi->groups[group]; |
| 489 | if (!mg->supported || group == MINSTREL_CCK_GROUP) |
| 490 | continue; |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 491 | |
| 492 | tmp_idx = mg->max_group_prob_rate % MCS_GROUP_RATES; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 493 | tmp_prob = mi->groups[group].rates[tmp_idx].prob_ewma; |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 494 | |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 495 | if (tmp_tp < minstrel_ht_get_tp_avg(mi, group, tmp_idx, tmp_prob) && |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 496 | (minstrel_mcs_groups[group].streams < tmp_max_streams)) { |
| 497 | mi->max_prob_rate = mg->max_group_prob_rate; |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 498 | tmp_tp = minstrel_ht_get_tp_avg(mi, group, |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 499 | tmp_idx, |
| 500 | tmp_prob); |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 501 | } |
| 502 | } |
| 503 | } |
| 504 | |
| 505 | /* |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 506 | * Update rate statistics and select new primary rates |
| 507 | * |
| 508 | * Rules for rate selection: |
| 509 | * - max_prob_rate must use only one stream, as a tradeoff between delivery |
| 510 | * probability and throughput during strong fluctuations |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 511 | * - as long as the max prob rate has a probability of more than 75%, pick |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 512 | * higher throughput rates, even if the probablity is a bit lower |
| 513 | */ |
| 514 | static void |
| 515 | minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) |
| 516 | { |
| 517 | struct minstrel_mcs_group_data *mg; |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 518 | struct minstrel_rate_stats *mrs; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 519 | int group, i, j, cur_prob; |
Karl Beldan | d4d141c | 2014-10-20 15:45:59 +0200 | [diff] [blame] | 520 | u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES]; |
| 521 | u16 tmp_cck_tp_rate[MAX_THR_RATES], index; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 522 | |
| 523 | if (mi->ampdu_packets > 0) { |
| 524 | mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len, |
| 525 | MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL); |
| 526 | mi->ampdu_len = 0; |
| 527 | mi->ampdu_packets = 0; |
| 528 | } |
| 529 | |
| 530 | mi->sample_slow = 0; |
| 531 | mi->sample_count = 0; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 532 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 533 | /* Initialize global rate indexes */ |
| 534 | for(j = 0; j < MAX_THR_RATES; j++){ |
| 535 | tmp_mcs_tp_rate[j] = 0; |
| 536 | tmp_cck_tp_rate[j] = 0; |
| 537 | } |
Karl Beldan | c2eb5b0 | 2013-04-18 14:26:20 +0200 | [diff] [blame] | 538 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 539 | /* Find best rate sets within all MCS groups*/ |
| 540 | for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) { |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 541 | |
| 542 | mg = &mi->groups[group]; |
| 543 | if (!mg->supported) |
| 544 | continue; |
| 545 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 546 | mi->sample_count++; |
| 547 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 548 | /* (re)Initialize group rate indexes */ |
| 549 | for(j = 0; j < MAX_THR_RATES; j++) |
| 550 | tmp_group_tp_rate[j] = group; |
| 551 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 552 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
| 553 | if (!(mg->supported & BIT(i))) |
| 554 | continue; |
| 555 | |
Karl Beldan | 351df09 | 2013-11-13 23:07:07 +0100 | [diff] [blame] | 556 | index = MCS_GROUP_RATES * group + i; |
| 557 | |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 558 | mrs = &mg->rates[i]; |
| 559 | mrs->retry_updated = false; |
| 560 | minstrel_calc_rate_stats(mrs); |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 561 | cur_prob = mrs->prob_ewma; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 562 | |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 563 | if (minstrel_ht_get_tp_avg(mi, group, i, cur_prob) == 0) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 564 | continue; |
| 565 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 566 | /* Find max throughput rate set */ |
| 567 | if (group != MINSTREL_CCK_GROUP) { |
| 568 | minstrel_ht_sort_best_tp_rates(mi, index, |
| 569 | tmp_mcs_tp_rate); |
| 570 | } else if (group == MINSTREL_CCK_GROUP) { |
| 571 | minstrel_ht_sort_best_tp_rates(mi, index, |
| 572 | tmp_cck_tp_rate); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 573 | } |
| 574 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 575 | /* Find max throughput rate set within a group */ |
| 576 | minstrel_ht_sort_best_tp_rates(mi, index, |
| 577 | tmp_group_tp_rate); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 578 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 579 | /* Find max probability rate per group and global */ |
| 580 | minstrel_ht_set_best_prob_rate(mi, index); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 581 | } |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 582 | |
| 583 | memcpy(mg->max_group_tp_rate, tmp_group_tp_rate, |
| 584 | sizeof(mg->max_group_tp_rate)); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 585 | } |
| 586 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 587 | /* Assign new rate set per sta */ |
| 588 | minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate, tmp_cck_tp_rate); |
| 589 | memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate)); |
| 590 | |
| 591 | /* Try to increase robustness of max_prob_rate*/ |
| 592 | minstrel_ht_prob_rate_reduce_streams(mi); |
| 593 | |
Felix Fietkau | 96d4ac3 | 2013-03-02 21:20:14 +0100 | [diff] [blame] | 594 | /* try to sample all available rates during each interval */ |
| 595 | mi->sample_count *= 8; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 596 | |
Lorenzo Bianconi | 37feb7e | 2013-08-27 16:59:47 +0200 | [diff] [blame] | 597 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 598 | /* use fixed index if set */ |
| 599 | if (mp->fixed_rate_idx != -1) { |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 600 | for (i = 0; i < 4; i++) |
| 601 | mi->max_tp_rate[i] = mp->fixed_rate_idx; |
Lorenzo Bianconi | 37feb7e | 2013-08-27 16:59:47 +0200 | [diff] [blame] | 602 | mi->max_prob_rate = mp->fixed_rate_idx; |
| 603 | } |
| 604 | #endif |
Felix Fietkau | a299c6d | 2013-03-02 21:20:13 +0100 | [diff] [blame] | 605 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 606 | /* Reset update timer */ |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 607 | mi->last_stats_update = jiffies; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 608 | } |
| 609 | |
| 610 | static bool |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 611 | minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 612 | { |
Helmut Schaa | b79296b | 2011-11-14 15:28:19 +0100 | [diff] [blame] | 613 | if (rate->idx < 0) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 614 | return false; |
| 615 | |
Helmut Schaa | b79296b | 2011-11-14 15:28:19 +0100 | [diff] [blame] | 616 | if (!rate->count) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 617 | return false; |
| 618 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 619 | if (rate->flags & IEEE80211_TX_RC_MCS || |
| 620 | rate->flags & IEEE80211_TX_RC_VHT_MCS) |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 621 | return true; |
| 622 | |
| 623 | return rate->idx == mp->cck_rates[0] || |
| 624 | rate->idx == mp->cck_rates[1] || |
| 625 | rate->idx == mp->cck_rates[2] || |
| 626 | rate->idx == mp->cck_rates[3]; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 627 | } |
| 628 | |
| 629 | static void |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 630 | minstrel_set_next_sample_idx(struct minstrel_ht_sta *mi) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 631 | { |
| 632 | struct minstrel_mcs_group_data *mg; |
| 633 | |
| 634 | for (;;) { |
| 635 | mi->sample_group++; |
| 636 | mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups); |
| 637 | mg = &mi->groups[mi->sample_group]; |
| 638 | |
| 639 | if (!mg->supported) |
| 640 | continue; |
| 641 | |
| 642 | if (++mg->index >= MCS_GROUP_RATES) { |
| 643 | mg->index = 0; |
| 644 | if (++mg->column >= ARRAY_SIZE(sample_table)) |
| 645 | mg->column = 0; |
| 646 | } |
| 647 | break; |
| 648 | } |
| 649 | } |
| 650 | |
| 651 | static void |
Karl Beldan | d4d141c | 2014-10-20 15:45:59 +0200 | [diff] [blame] | 652 | minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u16 *idx, bool primary) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 653 | { |
| 654 | int group, orig_group; |
| 655 | |
| 656 | orig_group = group = *idx / MCS_GROUP_RATES; |
| 657 | while (group > 0) { |
| 658 | group--; |
| 659 | |
| 660 | if (!mi->groups[group].supported) |
| 661 | continue; |
| 662 | |
| 663 | if (minstrel_mcs_groups[group].streams > |
| 664 | minstrel_mcs_groups[orig_group].streams) |
| 665 | continue; |
| 666 | |
| 667 | if (primary) |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 668 | *idx = mi->groups[group].max_group_tp_rate[0]; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 669 | else |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 670 | *idx = mi->groups[group].max_group_tp_rate[1]; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 671 | break; |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | static void |
Patrick Kelle | 6048d763 | 2011-11-15 16:44:48 +0100 | [diff] [blame] | 676 | minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 677 | { |
| 678 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 679 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
| 680 | u16 tid; |
| 681 | |
Felix Fietkau | 75769c8 | 2014-11-16 00:27:55 +0100 | [diff] [blame] | 682 | if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) |
| 683 | return; |
| 684 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 685 | if (unlikely(!ieee80211_is_data_qos(hdr->frame_control))) |
| 686 | return; |
| 687 | |
Johannes Berg | e133fae | 2013-08-22 08:36:41 +0200 | [diff] [blame] | 688 | if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE))) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 689 | return; |
| 690 | |
| 691 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
Johannes Berg | a622ab7 | 2010-06-10 10:21:39 +0200 | [diff] [blame] | 692 | if (likely(sta->ampdu_mlme.tid_tx[tid])) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 693 | return; |
| 694 | |
Felix Fietkau | 7a36b93 | 2016-02-18 19:49:18 +0100 | [diff] [blame] | 695 | ieee80211_start_tx_ba_session(pubsta, tid, 0); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 696 | } |
| 697 | |
| 698 | static void |
| 699 | minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband, |
| 700 | struct ieee80211_sta *sta, void *priv_sta, |
Felix Fietkau | 63558a6 | 2014-11-19 20:08:10 +0100 | [diff] [blame] | 701 | struct ieee80211_tx_info *info) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 702 | { |
| 703 | struct minstrel_ht_sta_priv *msp = priv_sta; |
| 704 | struct minstrel_ht_sta *mi = &msp->ht; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 705 | struct ieee80211_tx_rate *ar = info->status.rates; |
| 706 | struct minstrel_rate_stats *rate, *rate2; |
| 707 | struct minstrel_priv *mp = priv; |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 708 | bool last, update = false; |
Johannes Berg | a544ab7 | 2012-11-13 21:36:27 +0100 | [diff] [blame] | 709 | int i; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 710 | |
| 711 | if (!msp->is_ht) |
Felix Fietkau | 63558a6 | 2014-11-19 20:08:10 +0100 | [diff] [blame] | 712 | return mac80211_minstrel.tx_status_noskb(priv, sband, sta, |
| 713 | &msp->legacy, info); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 714 | |
| 715 | /* This packet was aggregated but doesn't carry status info */ |
| 716 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && |
| 717 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) |
| 718 | return; |
| 719 | |
Björn Smedman | 15d46f3 | 2010-10-10 22:14:25 +0200 | [diff] [blame] | 720 | if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) { |
| 721 | info->status.ampdu_ack_len = |
| 722 | (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 723 | info->status.ampdu_len = 1; |
| 724 | } |
| 725 | |
| 726 | mi->ampdu_packets++; |
| 727 | mi->ampdu_len += info->status.ampdu_len; |
| 728 | |
| 729 | if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) { |
Felix Fietkau | c7317e4 | 2010-10-21 02:47:25 +0200 | [diff] [blame] | 730 | mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len); |
Felix Fietkau | 52c00a3 | 2013-03-05 14:20:19 +0100 | [diff] [blame] | 731 | mi->sample_tries = 1; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 732 | mi->sample_count--; |
| 733 | } |
| 734 | |
Daniel Halperin | 8d5eab5 | 2011-03-09 03:10:18 -0800 | [diff] [blame] | 735 | if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 736 | mi->sample_packets += info->status.ampdu_len; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 737 | |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 738 | last = !minstrel_ht_txstat_valid(mp, &ar[0]); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 739 | for (i = 0; !last; i++) { |
| 740 | last = (i == IEEE80211_TX_MAX_RATES - 1) || |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 741 | !minstrel_ht_txstat_valid(mp, &ar[i + 1]); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 742 | |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 743 | rate = minstrel_ht_get_stats(mp, mi, &ar[i]); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 744 | |
Björn Smedman | 15d46f3 | 2010-10-10 22:14:25 +0200 | [diff] [blame] | 745 | if (last) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 746 | rate->success += info->status.ampdu_ack_len; |
| 747 | |
| 748 | rate->attempts += ar[i].count * info->status.ampdu_len; |
| 749 | } |
| 750 | |
| 751 | /* |
| 752 | * check for sudden death of spatial multiplexing, |
| 753 | * downgrade to a lower number of streams if necessary. |
| 754 | */ |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 755 | rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 756 | if (rate->attempts > 30 && |
| 757 | MINSTREL_FRAC(rate->success, rate->attempts) < |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 758 | MINSTREL_FRAC(20, 100)) { |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 759 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true); |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 760 | update = true; |
| 761 | } |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 762 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 763 | rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]); |
Ming Lei | ecc3d5a | 2010-07-01 23:19:50 +0800 | [diff] [blame] | 764 | if (rate2->attempts > 30 && |
| 765 | MINSTREL_FRAC(rate2->success, rate2->attempts) < |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 766 | MINSTREL_FRAC(20, 100)) { |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 767 | minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false); |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 768 | update = true; |
| 769 | } |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 770 | |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 771 | if (time_after(jiffies, mi->last_stats_update + |
| 772 | (mp->update_interval / 2 * HZ) / 1000)) { |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 773 | update = true; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 774 | minstrel_ht_update_stats(mp, mi); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 775 | } |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 776 | |
| 777 | if (update) |
| 778 | minstrel_ht_update_rates(mp, mi); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 779 | } |
| 780 | |
| 781 | static void |
| 782 | minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
| 783 | int index) |
| 784 | { |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 785 | struct minstrel_rate_stats *mrs; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 786 | const struct mcs_group *group; |
| 787 | unsigned int tx_time, tx_time_rtscts, tx_time_data; |
| 788 | unsigned int cw = mp->cw_min; |
Daniel Halperin | 8fddddf | 2011-05-10 19:00:45 -0700 | [diff] [blame] | 789 | unsigned int ctime = 0; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 790 | unsigned int t_slot = 9; /* FIXME */ |
| 791 | unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len); |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 792 | unsigned int overhead = 0, overhead_rtscts = 0; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 793 | |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 794 | mrs = minstrel_get_ratestats(mi, index); |
| 795 | if (mrs->prob_ewma < MINSTREL_FRAC(1, 10)) { |
| 796 | mrs->retry_count = 1; |
| 797 | mrs->retry_count_rtscts = 1; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 798 | return; |
| 799 | } |
| 800 | |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 801 | mrs->retry_count = 2; |
| 802 | mrs->retry_count_rtscts = 2; |
| 803 | mrs->retry_updated = true; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 804 | |
| 805 | group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; |
Felix Fietkau | ed97a13 | 2013-03-02 21:20:12 +0100 | [diff] [blame] | 806 | tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000; |
Daniel Halperin | 8fddddf | 2011-05-10 19:00:45 -0700 | [diff] [blame] | 807 | |
| 808 | /* Contention time for first 2 tries */ |
| 809 | ctime = (t_slot * cw) >> 1; |
| 810 | cw = min((cw << 1) | 1, mp->cw_max); |
| 811 | ctime += (t_slot * cw) >> 1; |
| 812 | cw = min((cw << 1) | 1, mp->cw_max); |
| 813 | |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 814 | if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) { |
| 815 | overhead = mi->overhead; |
| 816 | overhead_rtscts = mi->overhead_rtscts; |
| 817 | } |
| 818 | |
Daniel Halperin | 8fddddf | 2011-05-10 19:00:45 -0700 | [diff] [blame] | 819 | /* Total TX time for data and Contention after first 2 tries */ |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 820 | tx_time = ctime + 2 * (overhead + tx_time_data); |
| 821 | tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data); |
Daniel Halperin | 8fddddf | 2011-05-10 19:00:45 -0700 | [diff] [blame] | 822 | |
| 823 | /* See how many more tries we can fit inside segment size */ |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 824 | do { |
Daniel Halperin | 8fddddf | 2011-05-10 19:00:45 -0700 | [diff] [blame] | 825 | /* Contention time for this try */ |
| 826 | ctime = (t_slot * cw) >> 1; |
| 827 | cw = min((cw << 1) | 1, mp->cw_max); |
| 828 | |
| 829 | /* Total TX time after this try */ |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 830 | tx_time += ctime + overhead + tx_time_data; |
| 831 | tx_time_rtscts += ctime + overhead_rtscts + tx_time_data; |
Daniel Halperin | 8fddddf | 2011-05-10 19:00:45 -0700 | [diff] [blame] | 832 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 833 | if (tx_time_rtscts < mp->segment_size) |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 834 | mrs->retry_count_rtscts++; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 835 | } while ((tx_time < mp->segment_size) && |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 836 | (++mrs->retry_count < mp->max_retry)); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 837 | } |
| 838 | |
| 839 | |
| 840 | static void |
| 841 | minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 842 | struct ieee80211_sta_rates *ratetbl, int offset, int index) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 843 | { |
| 844 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 845 | struct minstrel_rate_stats *mrs; |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 846 | u8 idx; |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 847 | u16 flags = group->flags; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 848 | |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 849 | mrs = minstrel_get_ratestats(mi, index); |
| 850 | if (!mrs->retry_updated) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 851 | minstrel_calc_retransmit(mp, mi, index); |
| 852 | |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 853 | if (mrs->prob_ewma < MINSTREL_FRAC(20, 100) || !mrs->retry_count) { |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 854 | ratetbl->rate[offset].count = 2; |
| 855 | ratetbl->rate[offset].count_rts = 2; |
| 856 | ratetbl->rate[offset].count_cts = 2; |
| 857 | } else { |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 858 | ratetbl->rate[offset].count = mrs->retry_count; |
| 859 | ratetbl->rate[offset].count_cts = mrs->retry_count; |
| 860 | ratetbl->rate[offset].count_rts = mrs->retry_count_rtscts; |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 861 | } |
| 862 | |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 863 | if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 864 | idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)]; |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 865 | else if (flags & IEEE80211_TX_RC_VHT_MCS) |
| 866 | idx = ((group->streams - 1) << 4) | |
| 867 | ((index % MCS_GROUP_RATES) & 0xF); |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 868 | else |
Karl Beldan | 7a5e3fa | 2013-11-11 13:12:55 +0100 | [diff] [blame] | 869 | idx = index % MCS_GROUP_RATES + (group->streams - 1) * 8; |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 870 | |
Krishna Chaitanya | a3ebb4e | 2015-06-12 02:34:52 +0530 | [diff] [blame] | 871 | /* enable RTS/CTS if needed: |
| 872 | * - if station is in dynamic SMPS (and streams > 1) |
| 873 | * - for fallback rates, to increase chances of getting through |
| 874 | */ |
Felix Fietkau | c36dd3e | 2016-02-24 12:07:17 +0100 | [diff] [blame] | 875 | if (offset > 0 || |
Krishna Chaitanya | a3ebb4e | 2015-06-12 02:34:52 +0530 | [diff] [blame] | 876 | (mi->sta->smps_mode == IEEE80211_SMPS_DYNAMIC && |
| 877 | group->streams > 1)) { |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 878 | ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts; |
| 879 | flags |= IEEE80211_TX_RC_USE_RTS_CTS; |
| 880 | } |
| 881 | |
| 882 | ratetbl->rate[offset].idx = idx; |
| 883 | ratetbl->rate[offset].flags = flags; |
| 884 | } |
| 885 | |
| 886 | static void |
| 887 | minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) |
| 888 | { |
| 889 | struct ieee80211_sta_rates *rates; |
| 890 | int i = 0; |
| 891 | |
| 892 | rates = kzalloc(sizeof(*rates), GFP_ATOMIC); |
| 893 | if (!rates) |
| 894 | return; |
| 895 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 896 | /* Start with max_tp_rate[0] */ |
| 897 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]); |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 898 | |
| 899 | if (mp->hw->max_rates >= 3) { |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 900 | /* At least 3 tx rates supported, use max_tp_rate[1] next */ |
| 901 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]); |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 902 | } |
| 903 | |
| 904 | if (mp->hw->max_rates >= 2) { |
| 905 | /* |
| 906 | * At least 2 tx rates supported, use max_prob_rate next */ |
| 907 | minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate); |
| 908 | } |
| 909 | |
| 910 | rates->rate[i].idx = -1; |
| 911 | rate_control_set_rates(mp->hw, mi->sta, rates); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 912 | } |
| 913 | |
| 914 | static inline int |
| 915 | minstrel_get_duration(int index) |
| 916 | { |
| 917 | const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES]; |
| 918 | return group->duration[index % MCS_GROUP_RATES]; |
| 919 | } |
| 920 | |
| 921 | static int |
| 922 | minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi) |
| 923 | { |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 924 | struct minstrel_rate_stats *mrs; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 925 | struct minstrel_mcs_group_data *mg; |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 926 | unsigned int sample_dur, sample_group, cur_max_tp_streams; |
Felix Fietkau | 06171e9 | 2016-03-03 23:25:42 +0100 | [diff] [blame^] | 927 | int tp_rate1, tp_rate2; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 928 | int sample_idx = 0; |
| 929 | |
| 930 | if (mi->sample_wait > 0) { |
| 931 | mi->sample_wait--; |
| 932 | return -1; |
| 933 | } |
| 934 | |
| 935 | if (!mi->sample_tries) |
| 936 | return -1; |
| 937 | |
Felix Fietkau | 965237a | 2013-03-03 12:49:51 +0100 | [diff] [blame] | 938 | sample_group = mi->sample_group; |
Karl Beldan | f12140c | 2013-11-11 13:10:49 +0100 | [diff] [blame] | 939 | mg = &mi->groups[sample_group]; |
| 940 | sample_idx = sample_table[mg->column][mg->index]; |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 941 | minstrel_set_next_sample_idx(mi); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 942 | |
Karl Beldan | f12140c | 2013-11-11 13:10:49 +0100 | [diff] [blame] | 943 | if (!(mg->supported & BIT(sample_idx))) |
| 944 | return -1; |
| 945 | |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 946 | mrs = &mg->rates[sample_idx]; |
Karl Beldan | f12140c | 2013-11-11 13:10:49 +0100 | [diff] [blame] | 947 | sample_idx += sample_group * MCS_GROUP_RATES; |
| 948 | |
Felix Fietkau | 06171e9 | 2016-03-03 23:25:42 +0100 | [diff] [blame^] | 949 | /* Set tp_rate1, tp_rate2 to the highest / second highest max_tp_rate */ |
| 950 | if (minstrel_get_duration(mi->max_tp_rate[0]) > |
| 951 | minstrel_get_duration(mi->max_tp_rate[1])) { |
| 952 | tp_rate1 = mi->max_tp_rate[1]; |
| 953 | tp_rate2 = mi->max_tp_rate[0]; |
| 954 | } else { |
| 955 | tp_rate1 = mi->max_tp_rate[0]; |
| 956 | tp_rate2 = mi->max_tp_rate[1]; |
| 957 | } |
| 958 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 959 | /* |
Helmut Schaa | ba6fa29 | 2012-03-14 13:31:11 +0100 | [diff] [blame] | 960 | * Sampling might add some overhead (RTS, no aggregation) |
Felix Fietkau | 06171e9 | 2016-03-03 23:25:42 +0100 | [diff] [blame^] | 961 | * to the frame. Hence, don't use sampling for the highest currently |
| 962 | * used highest throughput or probability rate. |
Helmut Schaa | ba6fa29 | 2012-03-14 13:31:11 +0100 | [diff] [blame] | 963 | */ |
Felix Fietkau | 06171e9 | 2016-03-03 23:25:42 +0100 | [diff] [blame^] | 964 | if (sample_idx == mi->max_tp_rate[0] || sample_idx == mi->max_prob_rate) |
Helmut Schaa | ba6fa29 | 2012-03-14 13:31:11 +0100 | [diff] [blame] | 965 | return -1; |
Felix Fietkau | a0ca796 | 2013-03-16 17:00:27 +0100 | [diff] [blame] | 966 | |
Helmut Schaa | ba6fa29 | 2012-03-14 13:31:11 +0100 | [diff] [blame] | 967 | /* |
Felix Fietkau | bc96f24 | 2013-03-16 17:00:26 +0100 | [diff] [blame] | 968 | * Do not sample if the probability is already higher than 95% |
| 969 | * to avoid wasting airtime. |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 970 | */ |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 971 | if (mrs->prob_ewma > MINSTREL_FRAC(95, 100)) |
Daniel Halperin | 8d5eab5 | 2011-03-09 03:10:18 -0800 | [diff] [blame] | 972 | return -1; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 973 | |
| 974 | /* |
| 975 | * Make sure that lower rates get sampled only occasionally, |
| 976 | * if the link is working perfectly. |
| 977 | */ |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 978 | |
Felix Fietkau | 06171e9 | 2016-03-03 23:25:42 +0100 | [diff] [blame^] | 979 | cur_max_tp_streams = minstrel_mcs_groups[tp_rate1 / |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 980 | MCS_GROUP_RATES].streams; |
Felix Fietkau | 965237a | 2013-03-03 12:49:51 +0100 | [diff] [blame] | 981 | sample_dur = minstrel_get_duration(sample_idx); |
Felix Fietkau | 06171e9 | 2016-03-03 23:25:42 +0100 | [diff] [blame^] | 982 | if (sample_dur >= minstrel_get_duration(tp_rate2) && |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 983 | (cur_max_tp_streams - 1 < |
Felix Fietkau | 965237a | 2013-03-03 12:49:51 +0100 | [diff] [blame] | 984 | minstrel_mcs_groups[sample_group].streams || |
| 985 | sample_dur >= minstrel_get_duration(mi->max_prob_rate))) { |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 986 | if (mrs->sample_skipped < 20) |
Daniel Halperin | 8d5eab5 | 2011-03-09 03:10:18 -0800 | [diff] [blame] | 987 | return -1; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 988 | |
| 989 | if (mi->sample_slow++ > 2) |
Daniel Halperin | 8d5eab5 | 2011-03-09 03:10:18 -0800 | [diff] [blame] | 990 | return -1; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 991 | } |
Felix Fietkau | 098b8af | 2013-03-03 12:49:52 +0100 | [diff] [blame] | 992 | mi->sample_tries--; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 993 | |
| 994 | return sample_idx; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 995 | } |
| 996 | |
| 997 | static void |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 998 | minstrel_ht_check_cck_shortpreamble(struct minstrel_priv *mp, |
| 999 | struct minstrel_ht_sta *mi, bool val) |
| 1000 | { |
| 1001 | u8 supported = mi->groups[MINSTREL_CCK_GROUP].supported; |
| 1002 | |
| 1003 | if (!supported || !mi->cck_supported_short) |
| 1004 | return; |
| 1005 | |
| 1006 | if (supported & (mi->cck_supported_short << (val * 4))) |
| 1007 | return; |
| 1008 | |
| 1009 | supported ^= mi->cck_supported_short | (mi->cck_supported_short << 4); |
| 1010 | mi->groups[MINSTREL_CCK_GROUP].supported = supported; |
| 1011 | } |
| 1012 | |
| 1013 | static void |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1014 | minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, |
| 1015 | struct ieee80211_tx_rate_control *txrc) |
| 1016 | { |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 1017 | const struct mcs_group *sample_group; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1018 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 1019 | struct ieee80211_tx_rate *rate = &info->status.rates[0]; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1020 | struct minstrel_ht_sta_priv *msp = priv_sta; |
| 1021 | struct minstrel_ht_sta *mi = &msp->ht; |
| 1022 | struct minstrel_priv *mp = priv; |
| 1023 | int sample_idx; |
| 1024 | |
| 1025 | if (rate_control_send_low(sta, priv_sta, txrc)) |
| 1026 | return; |
| 1027 | |
| 1028 | if (!msp->is_ht) |
| 1029 | return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc); |
| 1030 | |
Felix Fietkau | 9594342 | 2014-11-19 20:08:07 +0100 | [diff] [blame] | 1031 | if (!(info->flags & IEEE80211_TX_CTL_AMPDU) && |
| 1032 | mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) |
| 1033 | minstrel_aggr_check(sta, txrc->skb); |
| 1034 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1035 | info->flags |= mi->tx_flags; |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 1036 | minstrel_ht_check_cck_shortpreamble(mp, mi, txrc->short_preamble); |
Helmut Schaa | 6de062c | 2011-08-01 11:32:53 +0200 | [diff] [blame] | 1037 | |
Lorenzo Bianconi | 37feb7e | 2013-08-27 16:59:47 +0200 | [diff] [blame] | 1038 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 1039 | if (mp->fixed_rate_idx != -1) |
| 1040 | return; |
| 1041 | #endif |
| 1042 | |
Helmut Schaa | 6de062c | 2011-08-01 11:32:53 +0200 | [diff] [blame] | 1043 | /* Don't use EAPOL frames for sampling on non-mrr hw */ |
| 1044 | if (mp->hw->max_rates == 1 && |
Johannes Berg | af61a16 | 2013-07-02 18:09:12 +0200 | [diff] [blame] | 1045 | (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)) |
Helmut Schaa | 6de062c | 2011-08-01 11:32:53 +0200 | [diff] [blame] | 1046 | sample_idx = -1; |
| 1047 | else |
| 1048 | sample_idx = minstrel_get_sample_rate(mp, mi); |
Zefir Kurtisi | 24f7580 | 2011-05-20 20:29:17 +0200 | [diff] [blame] | 1049 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1050 | mi->total_packets++; |
| 1051 | |
| 1052 | /* wraparound */ |
| 1053 | if (mi->total_packets == ~0) { |
| 1054 | mi->total_packets = 0; |
| 1055 | mi->sample_packets = 0; |
| 1056 | } |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 1057 | |
| 1058 | if (sample_idx < 0) |
| 1059 | return; |
| 1060 | |
| 1061 | sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES]; |
| 1062 | info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE; |
Felix Fietkau | 1cd1585 | 2013-06-28 21:04:35 +0200 | [diff] [blame] | 1063 | rate->count = 1; |
| 1064 | |
| 1065 | if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) { |
| 1066 | int idx = sample_idx % ARRAY_SIZE(mp->cck_rates); |
| 1067 | rate->idx = mp->cck_rates[idx]; |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1068 | } else if (sample_group->flags & IEEE80211_TX_RC_VHT_MCS) { |
| 1069 | ieee80211_rate_set_vht(rate, sample_idx % MCS_GROUP_RATES, |
| 1070 | sample_group->streams); |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 1071 | } else { |
| 1072 | rate->idx = sample_idx % MCS_GROUP_RATES + |
| 1073 | (sample_group->streams - 1) * 8; |
Felix Fietkau | 1cd1585 | 2013-06-28 21:04:35 +0200 | [diff] [blame] | 1074 | } |
| 1075 | |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 1076 | rate->flags = sample_group->flags; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1077 | } |
| 1078 | |
| 1079 | static void |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 1080 | minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi, |
| 1081 | struct ieee80211_supported_band *sband, |
| 1082 | struct ieee80211_sta *sta) |
| 1083 | { |
| 1084 | int i; |
| 1085 | |
| 1086 | if (sband->band != IEEE80211_BAND_2GHZ) |
| 1087 | return; |
| 1088 | |
Johannes Berg | 30686bf | 2015-06-02 21:39:54 +0200 | [diff] [blame] | 1089 | if (!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES)) |
Felix Fietkau | 2dfca31 | 2013-08-20 19:43:54 +0200 | [diff] [blame] | 1090 | return; |
| 1091 | |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 1092 | mi->cck_supported = 0; |
| 1093 | mi->cck_supported_short = 0; |
| 1094 | for (i = 0; i < 4; i++) { |
| 1095 | if (!rate_supported(sta, sband->band, mp->cck_rates[i])) |
| 1096 | continue; |
| 1097 | |
| 1098 | mi->cck_supported |= BIT(i); |
| 1099 | if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE) |
| 1100 | mi->cck_supported_short |= BIT(i); |
| 1101 | } |
| 1102 | |
| 1103 | mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported; |
| 1104 | } |
| 1105 | |
| 1106 | static void |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1107 | minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband, |
Simon Wunderlich | 3de805c | 2013-07-08 16:55:50 +0200 | [diff] [blame] | 1108 | struct cfg80211_chan_def *chandef, |
Johannes Berg | 64f68e5 | 2012-03-28 10:58:37 +0200 | [diff] [blame] | 1109 | struct ieee80211_sta *sta, void *priv_sta) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1110 | { |
| 1111 | struct minstrel_priv *mp = priv; |
| 1112 | struct minstrel_ht_sta_priv *msp = priv_sta; |
| 1113 | struct minstrel_ht_sta *mi = &msp->ht; |
| 1114 | struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1115 | u16 sta_cap = sta->ht_cap.cap; |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1116 | struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; |
| 1117 | int use_vht; |
Felix Fietkau | 4dc217d | 2011-03-25 15:30:38 +0100 | [diff] [blame] | 1118 | int n_supported = 0; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1119 | int ack_dur; |
| 1120 | int stbc; |
| 1121 | int i; |
| 1122 | |
| 1123 | /* fall back to the old minstrel for legacy stations */ |
Felix Fietkau | 4dc217d | 2011-03-25 15:30:38 +0100 | [diff] [blame] | 1124 | if (!sta->ht_cap.ht_supported) |
| 1125 | goto use_legacy; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1126 | |
Karl Beldan | 8a0ee4f | 2014-10-20 15:46:00 +0200 | [diff] [blame] | 1127 | BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1128 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1129 | #ifdef CONFIG_MAC80211_RC_MINSTREL_VHT |
| 1130 | if (vht_cap->vht_supported) |
| 1131 | use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0); |
| 1132 | else |
| 1133 | #endif |
| 1134 | use_vht = 0; |
| 1135 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1136 | msp->is_ht = true; |
| 1137 | memset(mi, 0, sizeof(*mi)); |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 1138 | |
| 1139 | mi->sta = sta; |
Thomas Huehn | 9134073 | 2015-03-24 21:09:39 +0100 | [diff] [blame] | 1140 | mi->last_stats_update = jiffies; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1141 | |
Simon Wunderlich | 438b61b | 2013-07-08 16:55:51 +0200 | [diff] [blame] | 1142 | ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0); |
| 1143 | mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0); |
| 1144 | mi->overhead += ack_dur; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1145 | mi->overhead_rtscts = mi->overhead + 2 * ack_dur; |
| 1146 | |
| 1147 | mi->avg_ampdu_len = MINSTREL_FRAC(1, 1); |
| 1148 | |
| 1149 | /* When using MRR, sample more on the first attempt, without delay */ |
| 1150 | if (mp->has_mrr) { |
| 1151 | mi->sample_count = 16; |
| 1152 | mi->sample_wait = 0; |
| 1153 | } else { |
| 1154 | mi->sample_count = 8; |
| 1155 | mi->sample_wait = 8; |
| 1156 | } |
| 1157 | mi->sample_tries = 4; |
| 1158 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1159 | /* TODO tx_flags for vht - ATM the RC API is not fine-grained enough */ |
| 1160 | if (!use_vht) { |
| 1161 | stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >> |
| 1162 | IEEE80211_HT_CAP_RX_STBC_SHIFT; |
| 1163 | mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1164 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1165 | if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING) |
| 1166 | mi->tx_flags |= IEEE80211_TX_CTL_LDPC; |
| 1167 | } |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1168 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1169 | for (i = 0; i < ARRAY_SIZE(mi->groups); i++) { |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 1170 | u32 gflags = minstrel_mcs_groups[i].flags; |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1171 | int bw, nss; |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 1172 | |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1173 | mi->groups[i].supported = 0; |
Felix Fietkau | a0497f9 | 2013-02-13 10:51:08 +0100 | [diff] [blame] | 1174 | if (i == MINSTREL_CCK_GROUP) { |
| 1175 | minstrel_ht_update_cck(mp, mi, sband, sta); |
| 1176 | continue; |
| 1177 | } |
| 1178 | |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 1179 | if (gflags & IEEE80211_TX_RC_SHORT_GI) { |
| 1180 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) { |
Johannes Berg | e1a0c6b | 2013-02-07 11:47:44 +0100 | [diff] [blame] | 1181 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_40)) |
| 1182 | continue; |
| 1183 | } else { |
| 1184 | if (!(sta_cap & IEEE80211_HT_CAP_SGI_20)) |
| 1185 | continue; |
| 1186 | } |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1187 | } |
| 1188 | |
Karl Beldan | 3ec373c | 2014-10-20 15:46:01 +0200 | [diff] [blame] | 1189 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH && |
Johannes Berg | e1a0c6b | 2013-02-07 11:47:44 +0100 | [diff] [blame] | 1190 | sta->bandwidth < IEEE80211_STA_RX_BW_40) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1191 | continue; |
| 1192 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1193 | nss = minstrel_mcs_groups[i].streams; |
| 1194 | |
Helmut Schaa | e921977 | 2012-03-09 14:13:45 +0100 | [diff] [blame] | 1195 | /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */ |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1196 | if (sta->smps_mode == IEEE80211_SMPS_STATIC && nss > 1) |
Helmut Schaa | e921977 | 2012-03-09 14:13:45 +0100 | [diff] [blame] | 1197 | continue; |
| 1198 | |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1199 | /* HT rate */ |
| 1200 | if (gflags & IEEE80211_TX_RC_MCS) { |
| 1201 | #ifdef CONFIG_MAC80211_RC_MINSTREL_VHT |
Karl Beldan | 9ffe904 | 2014-10-24 14:34:49 +0200 | [diff] [blame] | 1202 | if (use_vht && minstrel_vht_only) |
Karl Beldan | 9208247 | 2014-10-21 10:38:38 +0200 | [diff] [blame] | 1203 | continue; |
| 1204 | #endif |
| 1205 | mi->groups[i].supported = mcs->rx_mask[nss - 1]; |
| 1206 | if (mi->groups[i].supported) |
| 1207 | n_supported++; |
| 1208 | continue; |
| 1209 | } |
| 1210 | |
| 1211 | /* VHT rate */ |
| 1212 | if (!vht_cap->vht_supported || |
| 1213 | WARN_ON(!(gflags & IEEE80211_TX_RC_VHT_MCS)) || |
| 1214 | WARN_ON(gflags & IEEE80211_TX_RC_160_MHZ_WIDTH)) |
| 1215 | continue; |
| 1216 | |
| 1217 | if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) { |
| 1218 | if (sta->bandwidth < IEEE80211_STA_RX_BW_80 || |
| 1219 | ((gflags & IEEE80211_TX_RC_SHORT_GI) && |
| 1220 | !(vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80))) { |
| 1221 | continue; |
| 1222 | } |
| 1223 | } |
| 1224 | |
| 1225 | if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) |
| 1226 | bw = BW_40; |
| 1227 | else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) |
| 1228 | bw = BW_80; |
| 1229 | else |
| 1230 | bw = BW_20; |
| 1231 | |
| 1232 | mi->groups[i].supported = minstrel_get_valid_vht_rates(bw, nss, |
| 1233 | vht_cap->vht_mcs.tx_mcs_map); |
Felix Fietkau | 4dc217d | 2011-03-25 15:30:38 +0100 | [diff] [blame] | 1234 | |
| 1235 | if (mi->groups[i].supported) |
| 1236 | n_supported++; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1237 | } |
Felix Fietkau | 4dc217d | 2011-03-25 15:30:38 +0100 | [diff] [blame] | 1238 | |
| 1239 | if (!n_supported) |
| 1240 | goto use_legacy; |
| 1241 | |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 1242 | /* create an initial rate table with the lowest supported rates */ |
Karl Beldan | a364736 | 2013-04-18 14:26:21 +0200 | [diff] [blame] | 1243 | minstrel_ht_update_stats(mp, mi); |
Felix Fietkau | a856666 | 2013-04-22 16:14:42 +0200 | [diff] [blame] | 1244 | minstrel_ht_update_rates(mp, mi); |
Karl Beldan | a364736 | 2013-04-18 14:26:21 +0200 | [diff] [blame] | 1245 | |
Felix Fietkau | 4dc217d | 2011-03-25 15:30:38 +0100 | [diff] [blame] | 1246 | return; |
| 1247 | |
| 1248 | use_legacy: |
| 1249 | msp->is_ht = false; |
| 1250 | memset(&msp->legacy, 0, sizeof(msp->legacy)); |
| 1251 | msp->legacy.r = msp->ratelist; |
| 1252 | msp->legacy.sample_table = msp->sample_table; |
Simon Wunderlich | 3de805c | 2013-07-08 16:55:50 +0200 | [diff] [blame] | 1253 | return mac80211_minstrel.rate_init(priv, sband, chandef, sta, |
| 1254 | &msp->legacy); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1255 | } |
| 1256 | |
| 1257 | static void |
| 1258 | minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband, |
Simon Wunderlich | 3de805c | 2013-07-08 16:55:50 +0200 | [diff] [blame] | 1259 | struct cfg80211_chan_def *chandef, |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1260 | struct ieee80211_sta *sta, void *priv_sta) |
| 1261 | { |
Simon Wunderlich | 3de805c | 2013-07-08 16:55:50 +0200 | [diff] [blame] | 1262 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1263 | } |
| 1264 | |
| 1265 | static void |
| 1266 | minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband, |
Simon Wunderlich | 3de805c | 2013-07-08 16:55:50 +0200 | [diff] [blame] | 1267 | struct cfg80211_chan_def *chandef, |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1268 | struct ieee80211_sta *sta, void *priv_sta, |
Johannes Berg | 64f68e5 | 2012-03-28 10:58:37 +0200 | [diff] [blame] | 1269 | u32 changed) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1270 | { |
Simon Wunderlich | 3de805c | 2013-07-08 16:55:50 +0200 | [diff] [blame] | 1271 | minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1272 | } |
| 1273 | |
| 1274 | static void * |
| 1275 | minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp) |
| 1276 | { |
| 1277 | struct ieee80211_supported_band *sband; |
| 1278 | struct minstrel_ht_sta_priv *msp; |
| 1279 | struct minstrel_priv *mp = priv; |
| 1280 | struct ieee80211_hw *hw = mp->hw; |
| 1281 | int max_rates = 0; |
| 1282 | int i; |
| 1283 | |
| 1284 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { |
| 1285 | sband = hw->wiphy->bands[i]; |
| 1286 | if (sband && sband->n_bitrates > max_rates) |
| 1287 | max_rates = sband->n_bitrates; |
| 1288 | } |
| 1289 | |
Thomas Huehn | 472dd35 | 2012-06-29 06:26:27 -0700 | [diff] [blame] | 1290 | msp = kzalloc(sizeof(*msp), gfp); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1291 | if (!msp) |
| 1292 | return NULL; |
| 1293 | |
| 1294 | msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp); |
| 1295 | if (!msp->ratelist) |
| 1296 | goto error; |
| 1297 | |
| 1298 | msp->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp); |
| 1299 | if (!msp->sample_table) |
| 1300 | goto error1; |
| 1301 | |
| 1302 | return msp; |
| 1303 | |
| 1304 | error1: |
Dan Carpenter | 7e98801 | 2010-07-22 13:14:19 +0200 | [diff] [blame] | 1305 | kfree(msp->ratelist); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1306 | error: |
| 1307 | kfree(msp); |
| 1308 | return NULL; |
| 1309 | } |
| 1310 | |
| 1311 | static void |
| 1312 | minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta) |
| 1313 | { |
| 1314 | struct minstrel_ht_sta_priv *msp = priv_sta; |
| 1315 | |
| 1316 | kfree(msp->sample_table); |
| 1317 | kfree(msp->ratelist); |
| 1318 | kfree(msp); |
| 1319 | } |
| 1320 | |
| 1321 | static void * |
| 1322 | minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) |
| 1323 | { |
| 1324 | return mac80211_minstrel.alloc(hw, debugfsdir); |
| 1325 | } |
| 1326 | |
| 1327 | static void |
| 1328 | minstrel_ht_free(void *priv) |
| 1329 | { |
| 1330 | mac80211_minstrel.free(priv); |
| 1331 | } |
| 1332 | |
Antonio Quartulli | cca674d | 2014-05-19 21:53:20 +0200 | [diff] [blame] | 1333 | static u32 minstrel_ht_get_expected_throughput(void *priv_sta) |
| 1334 | { |
| 1335 | struct minstrel_ht_sta_priv *msp = priv_sta; |
| 1336 | struct minstrel_ht_sta *mi = &msp->ht; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 1337 | int i, j, prob, tp_avg; |
Antonio Quartulli | cca674d | 2014-05-19 21:53:20 +0200 | [diff] [blame] | 1338 | |
| 1339 | if (!msp->is_ht) |
| 1340 | return mac80211_minstrel.get_expected_throughput(priv_sta); |
| 1341 | |
Thomas Huehn | 5935839 | 2014-09-09 23:22:14 +0200 | [diff] [blame] | 1342 | i = mi->max_tp_rate[0] / MCS_GROUP_RATES; |
| 1343 | j = mi->max_tp_rate[0] % MCS_GROUP_RATES; |
Thomas Huehn | 50e55a8 | 2015-03-24 21:09:41 +0100 | [diff] [blame] | 1344 | prob = mi->groups[i].rates[j].prob_ewma; |
Antonio Quartulli | cca674d | 2014-05-19 21:53:20 +0200 | [diff] [blame] | 1345 | |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 1346 | /* convert tp_avg from pkt per second in kbps */ |
Sven Eckelmann | 212c5a5 | 2016-02-02 08:12:26 +0100 | [diff] [blame] | 1347 | tp_avg = minstrel_ht_get_tp_avg(mi, i, j, prob) * 10; |
| 1348 | tp_avg = tp_avg * AVG_PKT_SIZE * 8 / 1024; |
Thomas Huehn | 6a27b2c | 2015-03-24 21:09:40 +0100 | [diff] [blame] | 1349 | |
| 1350 | return tp_avg; |
Antonio Quartulli | cca674d | 2014-05-19 21:53:20 +0200 | [diff] [blame] | 1351 | } |
| 1352 | |
Johannes Berg | 631ad70 | 2014-01-20 23:29:34 +0100 | [diff] [blame] | 1353 | static const struct rate_control_ops mac80211_minstrel_ht = { |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1354 | .name = "minstrel_ht", |
Felix Fietkau | 63558a6 | 2014-11-19 20:08:10 +0100 | [diff] [blame] | 1355 | .tx_status_noskb = minstrel_ht_tx_status, |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1356 | .get_rate = minstrel_ht_get_rate, |
| 1357 | .rate_init = minstrel_ht_rate_init, |
| 1358 | .rate_update = minstrel_ht_rate_update, |
| 1359 | .alloc_sta = minstrel_ht_alloc_sta, |
| 1360 | .free_sta = minstrel_ht_free_sta, |
| 1361 | .alloc = minstrel_ht_alloc, |
| 1362 | .free = minstrel_ht_free, |
| 1363 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 1364 | .add_sta_debugfs = minstrel_ht_add_sta_debugfs, |
| 1365 | .remove_sta_debugfs = minstrel_ht_remove_sta_debugfs, |
| 1366 | #endif |
Antonio Quartulli | cca674d | 2014-05-19 21:53:20 +0200 | [diff] [blame] | 1367 | .get_expected_throughput = minstrel_ht_get_expected_throughput, |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1368 | }; |
| 1369 | |
| 1370 | |
Johannes Berg | f6e1a73 | 2014-01-21 00:32:52 +0100 | [diff] [blame] | 1371 | static void __init init_sample_table(void) |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1372 | { |
| 1373 | int col, i, new_idx; |
| 1374 | u8 rnd[MCS_GROUP_RATES]; |
| 1375 | |
| 1376 | memset(sample_table, 0xff, sizeof(sample_table)); |
| 1377 | for (col = 0; col < SAMPLE_COLUMNS; col++) { |
Karl Beldan | f7d8ad8 | 2013-11-13 10:54:19 +0100 | [diff] [blame] | 1378 | prandom_bytes(rnd, sizeof(rnd)); |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1379 | for (i = 0; i < MCS_GROUP_RATES; i++) { |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1380 | new_idx = (i + rnd[i]) % MCS_GROUP_RATES; |
Felix Fietkau | ec8aa66 | 2010-05-13 16:48:03 +0200 | [diff] [blame] | 1381 | while (sample_table[col][new_idx] != 0xff) |
| 1382 | new_idx = (new_idx + 1) % MCS_GROUP_RATES; |
| 1383 | |
| 1384 | sample_table[col][new_idx] = i; |
| 1385 | } |
| 1386 | } |
| 1387 | } |
| 1388 | |
| 1389 | int __init |
| 1390 | rc80211_minstrel_ht_init(void) |
| 1391 | { |
| 1392 | init_sample_table(); |
| 1393 | return ieee80211_rate_control_register(&mac80211_minstrel_ht); |
| 1394 | } |
| 1395 | |
| 1396 | void |
| 1397 | rc80211_minstrel_ht_exit(void) |
| 1398 | { |
| 1399 | ieee80211_rate_control_unregister(&mac80211_minstrel_ht); |
| 1400 | } |