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ath9k: remove pointless wrapper ath_rc_rate_getidx()
[deliverable/linux.git] / drivers / net / wireless / ath / ath9k / rc.c
CommitLineData
f078f209
LR		 1/*
2 * Copyright (c) 2004 Video54 Technologies, Inc.
cee075a2 3 * Copyright (c) 2004-2009 Atheros Communications, Inc.
f078f209
LR		 4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
394cf0a1 18#include "ath9k.h"
f078f209 19
4f0fc7c3 20static const struct ath_rate_table ar5416_11na_ratetable = {
f078f209
LR		 21 42,
22 {
46d14a58 23 { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
f078f209
LR		 24 5400, 0x0b, 0x00, 12,
25 0, 2, 1, 0, 0, 0, 0, 0 },
e8324357 26 { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
f078f209
LR		 27 7800, 0x0f, 0x00, 18,
28 0, 3, 1, 1, 1, 1, 1, 0 },
46d14a58 29 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
f078f209
LR		 30 10000, 0x0a, 0x00, 24,
31 2, 4, 2, 2, 2, 2, 2, 0 },
46d14a58 32 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
f078f209
LR		 33 13900, 0x0e, 0x00, 36,
34 2, 6, 2, 3, 3, 3, 3, 0 },
46d14a58 35 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
f078f209
LR		 36 17300, 0x09, 0x00, 48,
37 4, 10, 3, 4, 4, 4, 4, 0 },
46d14a58 38 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
f078f209
LR		 39 23000, 0x0d, 0x00, 72,
40 4, 14, 3, 5, 5, 5, 5, 0 },
46d14a58 41 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
f078f209
LR		 42 27400, 0x08, 0x00, 96,
43 4, 20, 3, 6, 6, 6, 6, 0 },
46d14a58 44 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
f078f209
LR		 45 29300, 0x0c, 0x00, 108,
46 4, 23, 3, 7, 7, 7, 7, 0 },
46d14a58 47 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
f078f209
LR		 48 6400, 0x80, 0x00, 0,
49 0, 2, 3, 8, 24, 8, 24, 3216 },
46d14a58 50 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
f078f209
LR		 51 12700, 0x81, 0x00, 1,
52 2, 4, 3, 9, 25, 9, 25, 6434 },
46d14a58 53 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
f078f209
LR		 54 18800, 0x82, 0x00, 2,
55 2, 6, 3, 10, 26, 10, 26, 9650 },
46d14a58 56 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
f078f209
LR		 57 25000, 0x83, 0x00, 3,
58 4, 10, 3, 11, 27, 11, 27, 12868 },
46d14a58 59 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
f078f209
LR		 60 36700, 0x84, 0x00, 4,
61 4, 14, 3, 12, 28, 12, 28, 19304 },
46d14a58 62 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
f078f209
LR		 63 48100, 0x85, 0x00, 5,
64 4, 20, 3, 13, 29, 13, 29, 25740 },
46d14a58 65 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
f078f209
LR		 66 53500, 0x86, 0x00, 6,
67 4, 23, 3, 14, 30, 14, 30, 28956 },
46d14a58 68 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
f078f209
LR		 69 59000, 0x87, 0x00, 7,
70 4, 25, 3, 15, 31, 15, 32, 32180 },
46d14a58 71 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
f078f209
LR		 72 12700, 0x88, 0x00,
73 8, 0, 2, 3, 16, 33, 16, 33, 6430 },
46d14a58 74 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
f078f209
LR		 75 24800, 0x89, 0x00, 9,
76 2, 4, 3, 17, 34, 17, 34, 12860 },
46d14a58 77 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
f078f209
LR		 78 36600, 0x8a, 0x00, 10,
79 2, 6, 3, 18, 35, 18, 35, 19300 },
46d14a58 80 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
f078f209
LR		 81 48100, 0x8b, 0x00, 11,
82 4, 10, 3, 19, 36, 19, 36, 25736 },
46d14a58 83 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
f078f209
LR		 84 69500, 0x8c, 0x00, 12,
85 4, 14, 3, 20, 37, 20, 37, 38600 },
46d14a58 86 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
f078f209
LR		 87 89500, 0x8d, 0x00, 13,
88 4, 20, 3, 21, 38, 21, 38, 51472 },
46d14a58 89 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
f078f209
LR		 90 98900, 0x8e, 0x00, 14,
91 4, 23, 3, 22, 39, 22, 39, 57890 },
46d14a58 92 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
f078f209
LR		 93 108300, 0x8f, 0x00, 15,
94 4, 25, 3, 23, 40, 23, 41, 64320 },
46d14a58 95 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
f078f209
LR		 96 13200, 0x80, 0x00, 0,
97 0, 2, 3, 8, 24, 24, 24, 6684 },
46d14a58 98 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
f078f209
LR		 99 25900, 0x81, 0x00, 1,
100 2, 4, 3, 9, 25, 25, 25, 13368 },
46d14a58 101 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
f078f209
LR		 102 38600, 0x82, 0x00, 2,
103 2, 6, 3, 10, 26, 26, 26, 20052 },
46d14a58 104 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
f078f209
LR		 105 49800, 0x83, 0x00, 3,
106 4, 10, 3, 11, 27, 27, 27, 26738 },
46d14a58 107 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
f078f209
LR		 108 72200, 0x84, 0x00, 4,
109 4, 14, 3, 12, 28, 28, 28, 40104 },
46d14a58 110 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
f078f209
LR		 111 92900, 0x85, 0x00, 5,
112 4, 20, 3, 13, 29, 29, 29, 53476 },
46d14a58 113 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
f078f209
LR		 114 102700, 0x86, 0x00, 6,
115 4, 23, 3, 14, 30, 30, 30, 60156 },
46d14a58 116 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
f078f209
LR		 117 112000, 0x87, 0x00, 7,
118 4, 25, 3, 15, 31, 32, 32, 66840 },
46d14a58 119 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
f078f209
LR		 120 122000, 0x87, 0x00, 7,
121 4, 25, 3, 15, 31, 32, 32, 74200 },
46d14a58 122 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
f078f209
LR		 123 25800, 0x88, 0x00, 8,
124 0, 2, 3, 16, 33, 33, 33, 13360 },
46d14a58 125 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
f078f209
LR		 126 49800, 0x89, 0x00, 9,
127 2, 4, 3, 17, 34, 34, 34, 26720 },
46d14a58 128 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
f078f209
LR		 129 71900, 0x8a, 0x00, 10,
130 2, 6, 3, 18, 35, 35, 35, 40080 },
46d14a58 131 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
f078f209
LR		 132 92500, 0x8b, 0x00, 11,
133 4, 10, 3, 19, 36, 36, 36, 53440 },
46d14a58 134 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
f078f209
LR		 135 130300, 0x8c, 0x00, 12,
136 4, 14, 3, 20, 37, 37, 37, 80160 },
46d14a58 137 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
f078f209
LR		 138 162800, 0x8d, 0x00, 13,
139 4, 20, 3, 21, 38, 38, 38, 106880 },
46d14a58 140 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
f078f209
LR		 141 178200, 0x8e, 0x00, 14,
142 4, 23, 3, 22, 39, 39, 39, 120240 },
46d14a58 143 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
f078f209
LR		 144 192100, 0x8f, 0x00, 15,
145 4, 25, 3, 23, 40, 41, 41, 133600 },
46d14a58 146 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
f078f209
LR		 147 207000, 0x8f, 0x00, 15,
148 4, 25, 3, 23, 40, 41, 41, 148400 },
149 },
150 50, /* probe interval */
151 50, /* rssi reduce interval */
152 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
153};
154
f078f209
LR		 155/* 4ms frame limit not used for NG mode. The values filled
156 * for HT are the 64K max aggregate limit */
157
4f0fc7c3 158static const struct ath_rate_table ar5416_11ng_ratetable = {
f078f209
LR		 159 46,
160 {
46d14a58 161 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
f078f209
LR		 162 900, 0x1b, 0x00, 2,
163 0, 0, 1, 0, 0, 0, 0, 0 },
46d14a58 164 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
f078f209
LR		 165 1900, 0x1a, 0x04, 4,
166 1, 1, 1, 1, 1, 1, 1, 0 },
46d14a58 167 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
f078f209
LR		 168 4900, 0x19, 0x04, 11,
169 2, 2, 2, 2, 2, 2, 2, 0 },
46d14a58 170 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
f078f209
LR		 171 8100, 0x18, 0x04, 22,
172 3, 3, 2, 3, 3, 3, 3, 0 },
46d14a58 173 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
f078f209
LR		 174 5400, 0x0b, 0x00, 12,
175 4, 2, 1, 4, 4, 4, 4, 0 },
46d14a58 176 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
f078f209
LR		 177 7800, 0x0f, 0x00, 18,
178 4, 3, 1, 5, 5, 5, 5, 0 },
46d14a58 179 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
f078f209
LR		 180 10100, 0x0a, 0x00, 24,
181 6, 4, 1, 6, 6, 6, 6, 0 },
46d14a58 182 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
f078f209
LR		 183 14100, 0x0e, 0x00, 36,
184 6, 6, 2, 7, 7, 7, 7, 0 },
46d14a58 185 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
f078f209
LR		 186 17700, 0x09, 0x00, 48,
187 8, 10, 3, 8, 8, 8, 8, 0 },
46d14a58 188 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
f078f209
LR		 189 23700, 0x0d, 0x00, 72,
190 8, 14, 3, 9, 9, 9, 9, 0 },
46d14a58 191 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
f078f209
LR		 192 27400, 0x08, 0x00, 96,
193 8, 20, 3, 10, 10, 10, 10, 0 },
46d14a58 194 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
f078f209
LR		 195 30900, 0x0c, 0x00, 108,
196 8, 23, 3, 11, 11, 11, 11, 0 },
46d14a58 197 { INVALID, INVALID, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
f078f209
LR		 198 6400, 0x80, 0x00, 0,
199 4, 2, 3, 12, 28, 12, 28, 3216 },
46d14a58 200 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
f078f209
LR		 201 12700, 0x81, 0x00, 1,
202 6, 4, 3, 13, 29, 13, 29, 6434 },
46d14a58 203 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
f078f209
LR		 204 18800, 0x82, 0x00, 2,
205 6, 6, 3, 14, 30, 14, 30, 9650 },
46d14a58 206 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
f078f209
LR		 207 25000, 0x83, 0x00, 3,
208 8, 10, 3, 15, 31, 15, 31, 12868 },
46d14a58 209 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
f078f209
LR		 210 36700, 0x84, 0x00, 4,
211 8, 14, 3, 16, 32, 16, 32, 19304 },
46d14a58 212 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
f078f209
LR		 213 48100, 0x85, 0x00, 5,
214 8, 20, 3, 17, 33, 17, 33, 25740 },
46d14a58 215 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
f078f209
LR		 216 53500, 0x86, 0x00, 6,
217 8, 23, 3, 18, 34, 18, 34, 28956 },
46d14a58 218 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
f078f209
LR		 219 59000, 0x87, 0x00, 7,
220 8, 25, 3, 19, 35, 19, 36, 32180 },
46d14a58 221 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
f078f209
LR		 222 12700, 0x88, 0x00, 8,
223 4, 2, 3, 20, 37, 20, 37, 6430 },
46d14a58 224 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
f078f209
LR		 225 24800, 0x89, 0x00, 9,
226 6, 4, 3, 21, 38, 21, 38, 12860 },
46d14a58 227 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
f078f209
LR		 228 36600, 0x8a, 0x00, 10,
229 6, 6, 3, 22, 39, 22, 39, 19300 },
46d14a58 230 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
f078f209
LR		 231 48100, 0x8b, 0x00, 11,
232 8, 10, 3, 23, 40, 23, 40, 25736 },
46d14a58 233 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
f078f209
LR		 234 69500, 0x8c, 0x00, 12,
235 8, 14, 3, 24, 41, 24, 41, 38600 },
46d14a58 236 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
f078f209
LR		 237 89500, 0x8d, 0x00, 13,
238 8, 20, 3, 25, 42, 25, 42, 51472 },
46d14a58 239 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
f078f209
LR		 240 98900, 0x8e, 0x00, 14,
241 8, 23, 3, 26, 43, 26, 44, 57890 },
46d14a58 242 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
f078f209
LR		 243 108300, 0x8f, 0x00, 15,
244 8, 25, 3, 27, 44, 27, 45, 64320 },
46d14a58 245 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
f078f209
LR		 246 13200, 0x80, 0x00, 0,
247 8, 2, 3, 12, 28, 28, 28, 6684 },
46d14a58 248 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
f078f209
LR		 249 25900, 0x81, 0x00, 1,
250 8, 4, 3, 13, 29, 29, 29, 13368 },
46d14a58 251 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
f078f209
LR		 252 38600, 0x82, 0x00, 2,
253 8, 6, 3, 14, 30, 30, 30, 20052 },
46d14a58 254 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
f078f209
LR		 255 49800, 0x83, 0x00, 3,
256 8, 10, 3, 15, 31, 31, 31, 26738 },
46d14a58 257 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
f078f209
LR		 258 72200, 0x84, 0x00, 4,
259 8, 14, 3, 16, 32, 32, 32, 40104 },
46d14a58 260 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
f078f209
LR		 261 92900, 0x85, 0x00, 5,
262 8, 20, 3, 17, 33, 33, 33, 53476 },
46d14a58 263 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
f078f209
LR		 264 102700, 0x86, 0x00, 6,
265 8, 23, 3, 18, 34, 34, 34, 60156 },
46d14a58 266 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
f078f209
LR		 267 112000, 0x87, 0x00, 7,
268 8, 23, 3, 19, 35, 36, 36, 66840 },
46d14a58 269 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
f078f209
LR		 270 122000, 0x87, 0x00, 7,
271 8, 25, 3, 19, 35, 36, 36, 74200 },
46d14a58 272 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
f078f209
LR		 273 25800, 0x88, 0x00, 8,
274 8, 2, 3, 20, 37, 37, 37, 13360 },
46d14a58 275 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
f078f209
LR		 276 49800, 0x89, 0x00, 9,
277 8, 4, 3, 21, 38, 38, 38, 26720 },
46d14a58 278 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
f078f209
LR		 279 71900, 0x8a, 0x00, 10,
280 8, 6, 3, 22, 39, 39, 39, 40080 },
46d14a58 281 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
f078f209
LR		 282 92500, 0x8b, 0x00, 11,
283 8, 10, 3, 23, 40, 40, 40, 53440 },
46d14a58 284 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
f078f209
LR		 285 130300, 0x8c, 0x00, 12,
286 8, 14, 3, 24, 41, 41, 41, 80160 },
46d14a58 287 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
f078f209
LR		 288 162800, 0x8d, 0x00, 13,
289 8, 20, 3, 25, 42, 42, 42, 106880 },
46d14a58 290 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
f078f209
LR		 291 178200, 0x8e, 0x00, 14,
292 8, 23, 3, 26, 43, 43, 43, 120240 },
46d14a58 293 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
f078f209
LR		 294 192100, 0x8f, 0x00, 15,
295 8, 23, 3, 27, 44, 45, 45, 133600 },
46d14a58 296 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
f078f209
LR		 297 207000, 0x8f, 0x00, 15,
298 8, 25, 3, 27, 44, 45, 45, 148400 },
299 },
300 50, /* probe interval */
301 50, /* rssi reduce interval */
302 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
303};
304
4f0fc7c3 305static const struct ath_rate_table ar5416_11a_ratetable = {
f078f209
LR		 306 8,
307 {
46d14a58 308 { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
f078f209
LR		 309 5400, 0x0b, 0x00, (0x80|12),
310 0, 2, 1, 0, 0 },
46d14a58 311 { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
f078f209
LR		 312 7800, 0x0f, 0x00, 18,
313 0, 3, 1, 1, 0 },
46d14a58 314 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
f078f209
LR		 315 10000, 0x0a, 0x00, (0x80|24),
316 2, 4, 2, 2, 0 },
46d14a58 317 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
f078f209
LR		 318 13900, 0x0e, 0x00, 36,
319 2, 6, 2, 3, 0 },
46d14a58 320 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
f078f209
LR		 321 17300, 0x09, 0x00, (0x80|48),
322 4, 10, 3, 4, 0 },
46d14a58 323 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
f078f209
LR		 324 23000, 0x0d, 0x00, 72,
325 4, 14, 3, 5, 0 },
46d14a58 326 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
f078f209
LR		 327 27400, 0x08, 0x00, 96,
328 4, 19, 3, 6, 0 },
46d14a58 329 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
f078f209
LR		 330 29300, 0x0c, 0x00, 108,
331 4, 23, 3, 7, 0 },
332 },
333 50, /* probe interval */
334 50, /* rssi reduce interval */
335 0, /* Phy rates allowed initially */
336};
337
4f0fc7c3 338static const struct ath_rate_table ar5416_11g_ratetable = {
f078f209
LR		 339 12,
340 {
46d14a58 341 { VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
f078f209
LR		 342 900, 0x1b, 0x00, 2,
343 0, 0, 1, 0, 0 },
46d14a58 344 { VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
f078f209
LR		 345 1900, 0x1a, 0x04, 4,
346 1, 1, 1, 1, 0 },
46d14a58 347 { VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
f078f209
LR		 348 4900, 0x19, 0x04, 11,
349 2, 2, 2, 2, 0 },
46d14a58 350 { VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
f078f209
LR		 351 8100, 0x18, 0x04, 22,
352 3, 3, 2, 3, 0 },
46d14a58 353 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
f078f209
LR		 354 5400, 0x0b, 0x00, 12,
355 4, 2, 1, 4, 0 },
46d14a58 356 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
f078f209
LR		 357 7800, 0x0f, 0x00, 18,
358 4, 3, 1, 5, 0 },
46d14a58 359 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
f078f209
LR		 360 10000, 0x0a, 0x00, 24,
361 6, 4, 1, 6, 0 },
46d14a58 362 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
f078f209
LR		 363 13900, 0x0e, 0x00, 36,
364 6, 6, 2, 7, 0 },
46d14a58 365 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
f078f209
LR		 366 17300, 0x09, 0x00, 48,
367 8, 10, 3, 8, 0 },
46d14a58 368 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
f078f209
LR		 369 23000, 0x0d, 0x00, 72,
370 8, 14, 3, 9, 0 },
46d14a58 371 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
f078f209
LR		 372 27400, 0x08, 0x00, 96,
373 8, 19, 3, 10, 0 },
46d14a58 374 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
f078f209
LR		 375 29300, 0x0c, 0x00, 108,
376 8, 23, 3, 11, 0 },
377 },
378 50, /* probe interval */
379 50, /* rssi reduce interval */
380 0, /* Phy rates allowed initially */
381};
382
4f0fc7c3 383static const struct ath_rate_table ar5416_11b_ratetable = {
f078f209
LR		 384 4,
385 {
46d14a58 386 { VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
f078f209
LR		 387 900, 0x1b, 0x00, (0x80|2),
388 0, 0, 1, 0, 0 },
46d14a58 389 { VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
f078f209
LR		 390 1800, 0x1a, 0x04, (0x80|4),
391 1, 1, 1, 1, 0 },
46d14a58 392 { VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
f078f209
LR		 393 4300, 0x19, 0x04, (0x80|11),
394 1, 2, 2, 2, 0 },
46d14a58 395 { VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
f078f209
LR		 396 7100, 0x18, 0x04, (0x80|22),
397 1, 4, 100, 3, 0 },
398 },
399 100, /* probe interval */
400 100, /* rssi reduce interval */
401 0, /* Phy rates allowed initially */
402};
403
f078f209
LR		 404static inline int8_t median(int8_t a, int8_t b, int8_t c)
405{
406 if (a >= b) {
407 if (b >= c)
408 return b;
409 else if (a > c)
410 return c;
411 else
412 return a;
413 } else {
414 if (a >= c)
415 return a;
416 else if (b >= c)
417 return c;
418 else
419 return b;
420 }
421}
422
4f0fc7c3 423static void ath_rc_sort_validrates(const struct ath_rate_table *rate_table,
46d14a58 424 struct ath_rate_priv *ath_rc_priv)
f078f209
LR		 425{
426 u8 i, j, idx, idx_next;
427
256b7759 428 for (i = ath_rc_priv->max_valid_rate - 1; i > 0; i--) {
f078f209 429 for (j = 0; j <= i-1; j++) {
256b7759
S		 430 idx = ath_rc_priv->valid_rate_index[j];
431 idx_next = ath_rc_priv->valid_rate_index[j+1];
f078f209
LR		 432
433 if (rate_table->info[idx].ratekbps >
434 rate_table->info[idx_next].ratekbps) {
256b7759
S		 435 ath_rc_priv->valid_rate_index[j] = idx_next;
436 ath_rc_priv->valid_rate_index[j+1] = idx;
f078f209
LR		 437 }
438 }
439 }
440}
441
46d14a58 442static void ath_rc_init_valid_txmask(struct ath_rate_priv *ath_rc_priv)
f078f209
LR		 443{
444 u8 i;
445
256b7759 446 for (i = 0; i < ath_rc_priv->rate_table_size; i++)
46d14a58 447 ath_rc_priv->valid_rate_index[i] = 0;
f078f209
LR		 448}
449
46d14a58 450static inline void ath_rc_set_valid_txmask(struct ath_rate_priv *ath_rc_priv,
f078f209
LR		 451 u8 index, int valid_tx_rate)
452{
256b7759 453 ASSERT(index <= ath_rc_priv->rate_table_size);
46d14a58 454 ath_rc_priv->valid_rate_index[index] = valid_tx_rate ? 1 : 0;
f078f209
LR		 455}
456
46d14a58 457static inline int ath_rc_isvalid_txmask(struct ath_rate_priv *ath_rc_priv,
f078f209
LR		 458 u8 index)
459{
256b7759
S		 460 ASSERT(index <= ath_rc_priv->rate_table_size);
461 return ath_rc_priv->valid_rate_index[index];
f078f209
LR		 462}
463
4f0fc7c3
LR		 464static inline
465int ath_rc_get_nextvalid_txrate(const struct ath_rate_table *rate_table,
466 struct ath_rate_priv *ath_rc_priv,
467 u8 cur_valid_txrate,
468 u8 *next_idx)
f078f209
LR		 469{
470 u8 i;
471
256b7759
S		 472 for (i = 0; i < ath_rc_priv->max_valid_rate - 1; i++) {
473 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
474 *next_idx = ath_rc_priv->valid_rate_index[i+1];
46d14a58 475 return 1;
f078f209
LR		 476 }
477 }
478
479 /* No more valid rates */
480 *next_idx = 0;
2c5a744d 481
46d14a58 482 return 0;
f078f209
LR		 483}
484
485/* Return true only for single stream */
486
487static int ath_rc_valid_phyrate(u32 phy, u32 capflag, int ignore_cw)
488{
b657eade 489 if (WLAN_RC_PHY_HT(phy) && !(capflag & WLAN_RC_HT_FLAG))
46d14a58 490 return 0;
f078f209 491 if (WLAN_RC_PHY_DS(phy) && !(capflag & WLAN_RC_DS_FLAG))
46d14a58 492 return 0;
f078f209 493 if (WLAN_RC_PHY_SGI(phy) && !(capflag & WLAN_RC_SGI_FLAG))
46d14a58 494 return 0;
f078f209
LR		 495 if (!ignore_cw && WLAN_RC_PHY_HT(phy))
496 if (WLAN_RC_PHY_40(phy) && !(capflag & WLAN_RC_40_FLAG))
46d14a58 497 return 0;
f078f209 498 if (!WLAN_RC_PHY_40(phy) && (capflag & WLAN_RC_40_FLAG))
46d14a58
S		 499 return 0;
500 return 1;
f078f209
LR		 501}
502
503static inline int
4f0fc7c3 504ath_rc_get_nextlowervalid_txrate(const struct ath_rate_table *rate_table,
46d14a58 505 struct ath_rate_priv *ath_rc_priv,
f078f209
LR		 506 u8 cur_valid_txrate, u8 *next_idx)
507{
508 int8_t i;
509
256b7759
S		 510 for (i = 1; i < ath_rc_priv->max_valid_rate ; i++) {
511 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
512 *next_idx = ath_rc_priv->valid_rate_index[i-1];
46d14a58 513 return 1;
f078f209
LR		 514 }
515 }
2c5a744d 516
46d14a58 517 return 0;
f078f209
LR		 518}
519
2c5a744d 520static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
4f0fc7c3 521 const struct ath_rate_table *rate_table,
2c5a744d 522 u32 capflag)
f078f209 523{
f078f209
LR		 524 u8 i, hi = 0;
525 u32 valid;
526
f078f209 527 for (i = 0; i < rate_table->rate_cnt; i++) {
c6483cfe 528 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
dc2222a8
S		 529 rate_table->info[i].valid_single_stream :
530 rate_table->info[i].valid);
46d14a58 531 if (valid == 1) {
f078f209
LR		 532 u32 phy = rate_table->info[i].phy;
533 u8 valid_rate_count = 0;
534
46d14a58 535 if (!ath_rc_valid_phyrate(phy, capflag, 0))
f078f209
LR		 536 continue;
537
256b7759 538 valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];
f078f209 539
256b7759
S		 540 ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = i;
541 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
46d14a58 542 ath_rc_set_valid_txmask(ath_rc_priv, i, 1);
f078f209
LR		 543 hi = A_MAX(hi, i);
544 }
545 }
2c5a744d 546
f078f209
LR		 547 return hi;
548}
549
2c5a744d 550static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
4f0fc7c3 551 const struct ath_rate_table *rate_table,
2c5a744d
S		 552 struct ath_rateset *rateset,
553 u32 capflag)
f078f209 554{
f078f209 555 u8 i, j, hi = 0;
f078f209
LR		 556
557 /* Use intersection of working rates and valid rates */
558 for (i = 0; i < rateset->rs_nrates; i++) {
559 for (j = 0; j < rate_table->rate_cnt; j++) {
560 u32 phy = rate_table->info[j].phy;
c6483cfe
S		 561 u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
562 rate_table->info[j].valid_single_stream :
563 rate_table->info[j].valid);
2c5a744d
S		 564 u8 rate = rateset->rs_rates[i];
565 u8 dot11rate = rate_table->info[j].dot11rate;
f078f209
LR		 566
567 /* We allow a rate only if its valid and the
568 * capflag matches one of the validity
46d14a58 569 * (VALID/VALID_20/VALID_40) flags */
f078f209 570
2c5a744d
S		 571 if (((rate & 0x7F) == (dot11rate & 0x7F)) &&
572 ((valid & WLAN_RC_CAP_MODE(capflag)) ==
573 WLAN_RC_CAP_MODE(capflag)) &&
574 !WLAN_RC_PHY_HT(phy)) {
f078f209
LR		 575 u8 valid_rate_count = 0;
576
46d14a58 577 if (!ath_rc_valid_phyrate(phy, capflag, 0))
f078f209
LR		 578 continue;
579
580 valid_rate_count =
256b7759 581 ath_rc_priv->valid_phy_ratecnt[phy];
f078f209 582
256b7759 583 ath_rc_priv->valid_phy_rateidx[phy]
f078f209 584 [valid_rate_count] = j;
256b7759 585 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
46d14a58 586 ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
f078f209
LR		 587 hi = A_MAX(hi, j);
588 }
589 }
590 }
2c5a744d 591
f078f209
LR		 592 return hi;
593}
594
2c5a744d 595static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
4f0fc7c3 596 const struct ath_rate_table *rate_table,
2c5a744d 597 u8 *mcs_set, u32 capflag)
f078f209 598{
2c5a744d
S		 599 struct ath_rateset *rateset = (struct ath_rateset *)mcs_set;
600
f078f209 601 u8 i, j, hi = 0;
f078f209
LR		 602
603 /* Use intersection of working rates and valid rates */
2c5a744d 604 for (i = 0; i < rateset->rs_nrates; i++) {
f078f209
LR		 605 for (j = 0; j < rate_table->rate_cnt; j++) {
606 u32 phy = rate_table->info[j].phy;
c6483cfe 607 u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
dc2222a8
S		 608 rate_table->info[j].valid_single_stream :
609 rate_table->info[j].valid);
2c5a744d
S		 610 u8 rate = rateset->rs_rates[i];
611 u8 dot11rate = rate_table->info[j].dot11rate;
f078f209 612
2c5a744d 613 if (((rate & 0x7F) != (dot11rate & 0x7F)) ||
dc2222a8
S		 614 !WLAN_RC_PHY_HT(phy) ||
615 !WLAN_RC_PHY_HT_VALID(valid, capflag))
f078f209
LR		 616 continue;
617
46d14a58 618 if (!ath_rc_valid_phyrate(phy, capflag, 0))
f078f209
LR		 619 continue;
620
256b7759
S		 621 ath_rc_priv->valid_phy_rateidx[phy]
622 [ath_rc_priv->valid_phy_ratecnt[phy]] = j;
623 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
46d14a58 624 ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
f078f209
LR		 625 hi = A_MAX(hi, j);
626 }
627 }
f078f209 628
2c5a744d 629 return hi;
f078f209
LR		 630}
631
f078f209 632static u8 ath_rc_ratefind_ht(struct ath_softc *sc,
46d14a58 633 struct ath_rate_priv *ath_rc_priv,
4f0fc7c3 634 const struct ath_rate_table *rate_table,
3900898c 635 int *is_probing)
f078f209
LR		 636{
637 u32 dt, best_thruput, this_thruput, now_msec;
638 u8 rate, next_rate, best_rate, maxindex, minindex;
639 int8_t rssi_last, rssi_reduce = 0, index = 0;
f078f209 640
46d14a58 641 *is_probing = 0;
f078f209 642
256b7759
S		 643 rssi_last = median(ath_rc_priv->rssi_last,
644 ath_rc_priv->rssi_last_prev,
645 ath_rc_priv->rssi_last_prev2);
f078f209
LR		 646
647 /*
648 * Age (reduce) last ack rssi based on how old it is.
649 * The bizarre numbers are so the delta is 160msec,
650 * meaning we divide by 16.
651 * 0msec <= dt <= 25msec: don't derate
652 * 25msec <= dt <= 185msec: derate linearly from 0 to 10dB
653 * 185msec <= dt: derate by 10dB
654 */
655
656 now_msec = jiffies_to_msecs(jiffies);
256b7759 657 dt = now_msec - ath_rc_priv->rssi_time;
f078f209
LR		 658
659 if (dt >= 185)
660 rssi_reduce = 10;
661 else if (dt >= 25)
662 rssi_reduce = (u8)((dt - 25) >> 4);
663
664 /* Now reduce rssi_last by rssi_reduce */
665 if (rssi_last < rssi_reduce)
666 rssi_last = 0;
667 else
668 rssi_last -= rssi_reduce;
669
670 /*
671 * Now look up the rate in the rssi table and return it.
672 * If no rates match then we return 0 (lowest rate)
673 */
674
675 best_thruput = 0;
256b7759 676 maxindex = ath_rc_priv->max_valid_rate-1;
f078f209
LR		 677
678 minindex = 0;
679 best_rate = minindex;
680
681 /*
682 * Try the higher rate first. It will reduce memory moving time
683 * if we have very good channel characteristics.
684 */
685 for (index = maxindex; index >= minindex ; index--) {
686 u8 per_thres;
687
256b7759
S		 688 rate = ath_rc_priv->valid_rate_index[index];
689 if (rate > ath_rc_priv->rate_max_phy)
f078f209
LR		 690 continue;
691
692 /*
693 * For TCP the average collision rate is around 11%,
694 * so we ignore PERs less than this. This is to
695 * prevent the rate we are currently using (whose
696 * PER might be in the 10-15 range because of TCP
697 * collisions) looking worse than the next lower
698 * rate whose PER has decayed close to 0. If we
699 * used to next lower rate, its PER would grow to
700 * 10-15 and we would be worse off then staying
701 * at the current rate.
702 */
256b7759 703 per_thres = ath_rc_priv->state[rate].per;
f078f209
LR		 704 if (per_thres < 12)
705 per_thres = 12;
706
707 this_thruput = rate_table->info[rate].user_ratekbps *
708 (100 - per_thres);
709
710 if (best_thruput <= this_thruput) {
711 best_thruput = this_thruput;
712 best_rate = rate;
713 }
714 }
715
716 rate = best_rate;
256b7759 717 ath_rc_priv->rssi_last_lookup = rssi_last;
f078f209
LR		 718
719 /*
720 * Must check the actual rate (ratekbps) to account for
721 * non-monoticity of 11g's rate table
722 */
723
3900898c 724 if (rate >= ath_rc_priv->rate_max_phy) {
256b7759 725 rate = ath_rc_priv->rate_max_phy;
f078f209
LR		 726
727 /* Probe the next allowed phy state */
f078f209 728 if (ath_rc_get_nextvalid_txrate(rate_table,
3900898c 729 ath_rc_priv, rate, &next_rate) &&
256b7759 730 (now_msec - ath_rc_priv->probe_time >
f078f209 731 rate_table->probe_interval) &&
256b7759 732 (ath_rc_priv->hw_maxretry_pktcnt >= 1)) {
f078f209 733 rate = next_rate;
256b7759
S		 734 ath_rc_priv->probe_rate = rate;
735 ath_rc_priv->probe_time = now_msec;
736 ath_rc_priv->hw_maxretry_pktcnt = 0;
46d14a58 737 *is_probing = 1;
f078f209
LR		 738 }
739 }
740
256b7759
S		 741 if (rate > (ath_rc_priv->rate_table_size - 1))
742 rate = ath_rc_priv->rate_table_size - 1;
f078f209 743
e43419f9
LR		 744 if (rate_table->info[rate].valid &&
745 (ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
746 return rate;
747
748 if (rate_table->info[rate].valid_single_stream &&
749 !(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG));
750 return rate;
751
752 /* This should not happen */
753 WARN_ON(1);
754
755 rate = ath_rc_priv->valid_rate_index[0];
f078f209
LR		 756
757 return rate;
758}
759
4f0fc7c3 760static void ath_rc_rate_set_series(const struct ath_rate_table *rate_table,
a8efee4f 761 struct ieee80211_tx_rate *rate,
c89424df 762 struct ieee80211_tx_rate_control *txrc,
2c5a744d 763 u8 tries, u8 rix, int rtsctsenable)
f078f209 764{
a8efee4f
S		 765 rate->count = tries;
766 rate->idx = rix;
767
c89424df
S		 768 if (txrc->short_preamble)
769 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
770 if (txrc->rts || rtsctsenable)
a8efee4f
S		 771 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
772 if (WLAN_RC_PHY_40(rate_table->info[rix].phy))
773 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
774 if (WLAN_RC_PHY_SGI(rate_table->info[rix].phy))
775 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
776 if (WLAN_RC_PHY_HT(rate_table->info[rix].phy))
777 rate->flags |= IEEE80211_TX_RC_MCS;
f078f209
LR		 778}
779
c89424df 780static void ath_rc_rate_set_rtscts(struct ath_softc *sc,
4f0fc7c3 781 const struct ath_rate_table *rate_table,
c89424df
S		 782 struct ieee80211_tx_info *tx_info)
783{
784 struct ieee80211_tx_rate *rates = tx_info->control.rates;
785 int i = 0, rix = 0, cix, enable_g_protection = 0;
786
787 /* get the cix for the lowest valid rix */
788 for (i = 3; i >= 0; i--) {
789 if (rates[i].count && (rates[i].idx >= 0)) {
790 rix = rates[i].idx;
791 break;
792 }
793 }
794 cix = rate_table->info[rix].ctrl_rate;
795
796 /* All protection frames are transmited at 2Mb/s for 802.11g,
797 * otherwise we transmit them at 1Mb/s */
798 if (sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ &&
799 !conf_is_ht(&sc->hw->conf))
800 enable_g_protection = 1;
801
802 /*
803 * If 802.11g protection is enabled, determine whether to use RTS/CTS or
804 * just CTS. Note that this is only done for OFDM/HT unicast frames.
805 */
806 if ((sc->sc_flags & SC_OP_PROTECT_ENABLE) &&
807 !(tx_info->flags & IEEE80211_TX_CTL_NO_ACK) &&
808 (rate_table->info[rix].phy == WLAN_RC_PHY_OFDM ||
809 WLAN_RC_PHY_HT(rate_table->info[rix].phy))) {
810 rates[0].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
811 cix = rate_table->info[enable_g_protection].ctrl_rate;
812 }
813
814 tx_info->control.rts_cts_rate_idx = cix;
815}
816
f078f209 817static void ath_rc_ratefind(struct ath_softc *sc,
46d14a58 818 struct ath_rate_priv *ath_rc_priv,
3900898c 819 struct ieee80211_tx_rate_control *txrc)
f078f209 820{
4f0fc7c3 821 const struct ath_rate_table *rate_table;
3900898c
S		 822 struct sk_buff *skb = txrc->skb;
823 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
a8efee4f 824 struct ieee80211_tx_rate *rates = tx_info->control.rates;
c89424df
S		 825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
826 __le16 fc = hdr->frame_control;
dd190183 827 u8 try_per_rate, i = 0, rix, nrix;
3900898c 828 int is_probe = 0;
f078f209 829
dd190183
LR		 830 /*
831 * For Multi Rate Retry we use a different number of
832 * retry attempt counts. This ends up looking like this:
833 *
834 * MRR[0] = 2
835 * MRR[1] = 2
836 * MRR[2] = 2
837 * MRR[3] = 4
838 *
839 */
840 try_per_rate = sc->hw->max_rate_tries;
841
40990ec0 842 rate_table = sc->cur_rate_table;
3900898c 843 rix = ath_rc_ratefind_ht(sc, ath_rc_priv, rate_table, &is_probe);
f078f209
LR		 844 nrix = rix;
845
3900898c 846 if (is_probe) {
f078f209
LR		 847 /* set one try for probe rates. For the
848 * probes don't enable rts */
c89424df 849 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
3900898c 850 1, nrix, 0);
f078f209 851
f078f209
LR		 852 /* Get the next tried/allowed rate. No RTS for the next series
853 * after the probe rate
854 */
20f57215
LR		 855 ath_rc_get_nextlowervalid_txrate(rate_table, ath_rc_priv,
856 rix, &nrix);
c89424df 857 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
3900898c 858 try_per_rate, nrix, 0);
14587ce2
VT		 859
860 tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
f078f209 861 } else {
f078f209 862 /* Set the choosen rate. No RTS for first series entry. */
c89424df 863 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
3900898c 864 try_per_rate, nrix, 0);
f078f209
LR		 865 }
866
867 /* Fill in the other rates for multirate retry */
3900898c 868 for ( ; i < 4; i++) {
dd190183
LR		 869 /* Use twice the number of tries for the last MRR segment. */
870 if (i + 1 == 4)
871 try_per_rate = 4;
872
20f57215
LR		 873 ath_rc_get_nextlowervalid_txrate(rate_table, ath_rc_priv,
874 rix, &nrix);
f078f209 875 /* All other rates in the series have RTS enabled */
c89424df 876 ath_rc_rate_set_series(rate_table, &rates[i], txrc,
dd190183 877 try_per_rate, nrix, 1);
f078f209
LR		 878 }
879
880 /*
881 * NB:Change rate series to enable aggregation when operating
882 * at lower MCS rates. When first rate in series is MCS2
883 * in HT40 @ 2.4GHz, series should look like:
884 *
885 * {MCS2, MCS1, MCS0, MCS0}.
886 *
887 * When first rate in series is MCS3 in HT20 @ 2.4GHz, series should
888 * look like:
889 *
890 * {MCS3, MCS2, MCS1, MCS1}
891 *
892 * So, set fourth rate in series to be same as third one for
893 * above conditions.
894 */
3706de6f 895 if ((sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ) &&
ecf70441 896 (conf_is_ht(&sc->hw->conf))) {
40990ec0 897 u8 dot11rate = rate_table->info[rix].dot11rate;
f078f209
LR		 898 u8 phy = rate_table->info[rix].phy;
899 if (i == 4 &&
900 ((dot11rate == 2 && phy == WLAN_RC_PHY_HT_40_SS) ||
dc2222a8 901 (dot11rate == 3 && phy == WLAN_RC_PHY_HT_20_SS))) {
a8efee4f
S		 902 rates[3].idx = rates[2].idx;
903 rates[3].flags = rates[2].flags;
f078f209
LR		 904 }
905 }
c89424df
S		 906
907 /*
908 * Force hardware to use computed duration for next
909 * fragment by disabling multi-rate retry, which
910 * updates duration based on the multi-rate duration table.
911 *
912 * FIXME: Fix duration
913 */
914 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK) &&
915 (ieee80211_has_morefrags(fc) ||
916 (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG))) {
917 rates[1].count = rates[2].count = rates[3].count = 0;
918 rates[1].idx = rates[2].idx = rates[3].idx = 0;
919 rates[0].count = ATH_TXMAXTRY;
920 }
921
922 /* Setup RTS/CTS */
923 ath_rc_rate_set_rtscts(sc, rate_table, tx_info);
f078f209
LR		 924}
925
2c5a744d 926static bool ath_rc_update_per(struct ath_softc *sc,
4f0fc7c3 927 const struct ath_rate_table *rate_table,
2c5a744d
S		 928 struct ath_rate_priv *ath_rc_priv,
929 struct ath_tx_info_priv *tx_info_priv,
930 int tx_rate, int xretries, int retries,
931 u32 now_msec)
f078f209 932{
2c5a744d
S		 933 bool state_change = false;
934 int count;
f078f209 935 u8 last_per;
f078f209
LR		 936 static u32 nretry_to_per_lookup[10] = {
937 100 * 0 / 1,
938 100 * 1 / 4,
939 100 * 1 / 2,
940 100 * 3 / 4,
941 100 * 4 / 5,
942 100 * 5 / 6,
943 100 * 6 / 7,
944 100 * 7 / 8,
945 100 * 8 / 9,
946 100 * 9 / 10
947 };
948
256b7759 949 last_per = ath_rc_priv->state[tx_rate].per;
f078f209
LR		 950
951 if (xretries) {
f078f209 952 if (xretries == 1) {
256b7759
S		 953 ath_rc_priv->state[tx_rate].per += 30;
954 if (ath_rc_priv->state[tx_rate].per > 100)
955 ath_rc_priv->state[tx_rate].per = 100;
f078f209
LR		 956 } else {
957 /* xretries == 2 */
87c1687d 958 count = ARRAY_SIZE(nretry_to_per_lookup);
f078f209
LR		 959 if (retries >= count)
960 retries = count - 1;
2c5a744d 961
f078f209 962 /* new_PER = 7/8*old_PER + 1/8*(currentPER) */
256b7759 963 ath_rc_priv->state[tx_rate].per =
2c5a744d 964 (u8)(last_per - (last_per >> 3) + (100 >> 3));
f078f209
LR		 965 }
966
967 /* xretries == 1 or 2 */
968
256b7759
S		 969 if (ath_rc_priv->probe_rate == tx_rate)
970 ath_rc_priv->probe_rate = 0;
f078f209 971
2c5a744d 972 } else { /* xretries == 0 */
87c1687d 973 count = ARRAY_SIZE(nretry_to_per_lookup);
f078f209
LR		 974 if (retries >= count)
975 retries = count - 1;
2c5a744d 976
46d14a58 977 if (tx_info_priv->n_bad_frames) {
dc2222a8 978 /* new_PER = 7/8*old_PER + 1/8*(currentPER)
f078f209
LR		 979 * Assuming that n_frames is not 0. The current PER
980 * from the retries is 100 * retries / (retries+1),
981 * since the first retries attempts failed, and the
982 * next one worked. For the one that worked,
983 * n_bad_frames subframes out of n_frames wored,
984 * so the PER for that part is
985 * 100 * n_bad_frames / n_frames, and it contributes
986 * 100 * n_bad_frames / (n_frames * (retries+1)) to
987 * the above PER. The expression below is a
988 * simplified version of the sum of these two terms.
989 */
2c5a744d
S		 990 if (tx_info_priv->n_frames > 0) {
991 int n_frames, n_bad_frames;
992 u8 cur_per, new_per;
993
994 n_bad_frames = retries * tx_info_priv->n_frames +
995 tx_info_priv->n_bad_frames;
996 n_frames = tx_info_priv->n_frames * (retries + 1);
997 cur_per = (100 * n_bad_frames / n_frames) >> 3;
998 new_per = (u8)(last_per - (last_per >> 3) + cur_per);
999 ath_rc_priv->state[tx_rate].per = new_per;
1000 }
f078f209 1001 } else {
2c5a744d
S		 1002 ath_rc_priv->state[tx_rate].per =
1003 (u8)(last_per - (last_per >> 3) +
1004 (nretry_to_per_lookup[retries] >> 3));
f078f209
LR		 1005 }
1006
256b7759
S		 1007 ath_rc_priv->rssi_last_prev2 = ath_rc_priv->rssi_last_prev;
1008 ath_rc_priv->rssi_last_prev = ath_rc_priv->rssi_last;
46d14a58 1009 ath_rc_priv->rssi_last = tx_info_priv->tx.ts_rssi;
256b7759 1010 ath_rc_priv->rssi_time = now_msec;
f078f209
LR		 1011
1012 /*
1013 * If we got at most one retry then increase the max rate if
1014 * this was a probe. Otherwise, ignore the probe.
1015 */
256b7759 1016 if (ath_rc_priv->probe_rate && ath_rc_priv->probe_rate == tx_rate) {
46d14a58
S		 1017 if (retries > 0 || 2 * tx_info_priv->n_bad_frames >
1018 tx_info_priv->n_frames) {
f078f209
LR		 1019 /*
1020 * Since we probed with just a single attempt,
1021 * any retries means the probe failed. Also,
1022 * if the attempt worked, but more than half
1023 * the subframes were bad then also consider
1024 * the probe a failure.
1025 */
256b7759 1026 ath_rc_priv->probe_rate = 0;
f078f209
LR		 1027 } else {
1028 u8 probe_rate = 0;
1029
2c5a744d
S		 1030 ath_rc_priv->rate_max_phy =
1031 ath_rc_priv->probe_rate;
256b7759 1032 probe_rate = ath_rc_priv->probe_rate;
f078f209 1033
256b7759
S		 1034 if (ath_rc_priv->state[probe_rate].per > 30)
1035 ath_rc_priv->state[probe_rate].per = 20;
f078f209 1036
256b7759 1037 ath_rc_priv->probe_rate = 0;
f078f209
LR		 1038
1039 /*
1040 * Since this probe succeeded, we allow the next
1041 * probe twice as soon. This allows the maxRate
1042 * to move up faster if the probes are
1043 * succesful.
1044 */
2c5a744d
S		 1045 ath_rc_priv->probe_time =
1046 now_msec - rate_table->probe_interval / 2;
f078f209
LR		 1047 }
1048 }
1049
1050 if (retries > 0) {
1051 /*
1052 * Don't update anything. We don't know if
1053 * this was because of collisions or poor signal.
1054 *
1055 * Later: if rssi_ack is close to
256b7759 1056 * ath_rc_priv->state[txRate].rssi_thres and we see lots
f078f209 1057 * of retries, then we could increase
256b7759 1058 * ath_rc_priv->state[txRate].rssi_thres.
f078f209 1059 */
256b7759 1060 ath_rc_priv->hw_maxretry_pktcnt = 0;
f078f209 1061 } else {
2c5a744d
S		 1062 int32_t rssi_ackAvg;
1063 int8_t rssi_thres;
1064 int8_t rssi_ack_vmin;
1065
f078f209
LR		 1066 /*
1067 * It worked with no retries. First ignore bogus (small)
1068 * rssi_ack values.
1069 */
256b7759
S		 1070 if (tx_rate == ath_rc_priv->rate_max_phy &&
1071 ath_rc_priv->hw_maxretry_pktcnt < 255) {
1072 ath_rc_priv->hw_maxretry_pktcnt++;
f078f209
LR		 1073 }
1074
2c5a744d
S		 1075 if (tx_info_priv->tx.ts_rssi <
1076 rate_table->info[tx_rate].rssi_ack_validmin)
1077 goto exit;
f078f209 1078
2c5a744d
S		 1079 /* Average the rssi */
1080 if (tx_rate != ath_rc_priv->rssi_sum_rate) {
1081 ath_rc_priv->rssi_sum_rate = tx_rate;
1082 ath_rc_priv->rssi_sum =
1083 ath_rc_priv->rssi_sum_cnt = 0;
1084 }
1085
1086 ath_rc_priv->rssi_sum += tx_info_priv->tx.ts_rssi;
1087 ath_rc_priv->rssi_sum_cnt++;
1088
1089 if (ath_rc_priv->rssi_sum_cnt < 4)
1090 goto exit;
1091
1092 rssi_ackAvg =
1093 (ath_rc_priv->rssi_sum + 2) / 4;
1094 rssi_thres =
1095 ath_rc_priv->state[tx_rate].rssi_thres;
1096 rssi_ack_vmin =
1097 rate_table->info[tx_rate].rssi_ack_validmin;
1098
1099 ath_rc_priv->rssi_sum =
1100 ath_rc_priv->rssi_sum_cnt = 0;
1101
1102 /* Now reduce the current rssi threshold */
1103 if ((rssi_ackAvg < rssi_thres + 2) &&
1104 (rssi_thres > rssi_ack_vmin)) {
1105 ath_rc_priv->state[tx_rate].rssi_thres--;
f078f209 1106 }
2c5a744d
S		 1107
1108 state_change = true;
f078f209
LR		 1109 }
1110 }
2c5a744d
S		 1111exit:
1112 return state_change;
1113}
1114
1115/* Update PER, RSSI and whatever else that the code thinks it is doing.
1116 If you can make sense of all this, you really need to go out more. */
1117
1118static void ath_rc_update_ht(struct ath_softc *sc,
1119 struct ath_rate_priv *ath_rc_priv,
1120 struct ath_tx_info_priv *tx_info_priv,
1121 int tx_rate, int xretries, int retries)
1122{
1123#define CHK_RSSI(rate) \
1124 ((ath_rc_priv->state[(rate)].rssi_thres + \
1125 rate_table->info[(rate)].rssi_ack_deltamin) > \
1126 ath_rc_priv->state[(rate)+1].rssi_thres)
1127
1128 u32 now_msec = jiffies_to_msecs(jiffies);
1129 int rate;
1130 u8 last_per;
1131 bool state_change = false;
4f0fc7c3 1132 const struct ath_rate_table *rate_table = sc->cur_rate_table;
2c5a744d
S		 1133 int size = ath_rc_priv->rate_table_size;
1134
1135 if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
1136 return;
f078f209 1137
2c5a744d
S		 1138 /* To compensate for some imbalance between ctrl and ext. channel */
1139
1140 if (WLAN_RC_PHY_40(rate_table->info[tx_rate].phy))
1141 tx_info_priv->tx.ts_rssi =
1142 tx_info_priv->tx.ts_rssi < 3 ? 0 :
1143 tx_info_priv->tx.ts_rssi - 3;
1144
1145 last_per = ath_rc_priv->state[tx_rate].per;
1146
1147 /* Update PER first */
1148 state_change = ath_rc_update_per(sc, rate_table, ath_rc_priv,
1149 tx_info_priv, tx_rate, xretries,
1150 retries, now_msec);
f078f209
LR		 1151
1152 /*
1153 * If this rate looks bad (high PER) then stop using it for
1154 * a while (except if we are probing).
1155 */
256b7759 1156 if (ath_rc_priv->state[tx_rate].per >= 55 && tx_rate > 0 &&
dc2222a8 1157 rate_table->info[tx_rate].ratekbps <=
256b7759
S		 1158 rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
1159 ath_rc_get_nextlowervalid_txrate(rate_table, ath_rc_priv,
2c5a744d 1160 (u8)tx_rate, &ath_rc_priv->rate_max_phy);
f078f209
LR		 1161
1162 /* Don't probe for a little while. */
256b7759 1163 ath_rc_priv->probe_time = now_msec;
f078f209
LR		 1164 }
1165
1166 if (state_change) {
1167 /*
1168 * Make sure the rates above this have higher rssi thresholds.
1169 * (Note: Monotonicity is kept within the OFDM rates and
1170 * within the CCK rates. However, no adjustment is
1171 * made to keep the rssi thresholds monotonically
1172 * increasing between the CCK and OFDM rates.)
1173 */
2c5a744d 1174 for (rate = tx_rate; rate < size - 1; rate++) {
f078f209 1175 if (rate_table->info[rate+1].phy !=
2c5a744d 1176 rate_table->info[tx_rate].phy)
f078f209
LR		 1177 break;
1178
2c5a744d 1179 if (CHK_RSSI(rate)) {
256b7759 1180 ath_rc_priv->state[rate+1].rssi_thres =
2c5a744d
S		 1181 ath_rc_priv->state[rate].rssi_thres +
1182 rate_table->info[rate].rssi_ack_deltamin;
f078f209
LR		 1183 }
1184 }
1185
1186 /* Make sure the rates below this have lower rssi thresholds. */
1187 for (rate = tx_rate - 1; rate >= 0; rate--) {
1188 if (rate_table->info[rate].phy !=
dc2222a8 1189 rate_table->info[tx_rate].phy)
f078f209
LR		 1190 break;
1191
2c5a744d 1192 if (CHK_RSSI(rate)) {
256b7759 1193 if (ath_rc_priv->state[rate+1].rssi_thres <
2c5a744d 1194 rate_table->info[rate].rssi_ack_deltamin)
256b7759 1195 ath_rc_priv->state[rate].rssi_thres = 0;
f078f209 1196 else {
256b7759 1197 ath_rc_priv->state[rate].rssi_thres =
2c5a744d
S		 1198 ath_rc_priv->state[rate+1].rssi_thres -
1199 rate_table->info[rate].rssi_ack_deltamin;
f078f209
LR		 1200 }
1201
256b7759 1202 if (ath_rc_priv->state[rate].rssi_thres <
2c5a744d 1203 rate_table->info[rate].rssi_ack_validmin) {
256b7759 1204 ath_rc_priv->state[rate].rssi_thres =
2c5a744d 1205 rate_table->info[rate].rssi_ack_validmin;
f078f209
LR		 1206 }
1207 }
1208 }
1209 }
1210
1211 /* Make sure the rates below this have lower PER */
1212 /* Monotonicity is kept only for rates below the current rate. */
256b7759 1213 if (ath_rc_priv->state[tx_rate].per < last_per) {
f078f209
LR		 1214 for (rate = tx_rate - 1; rate >= 0; rate--) {
1215 if (rate_table->info[rate].phy !=
dc2222a8 1216 rate_table->info[tx_rate].phy)
f078f209
LR		 1217 break;
1218
256b7759
S		 1219 if (ath_rc_priv->state[rate].per >
1220 ath_rc_priv->state[rate+1].per) {
1221 ath_rc_priv->state[rate].per =
1222 ath_rc_priv->state[rate+1].per;
f078f209
LR		 1223 }
1224 }
1225 }
1226
1227 /* Maintain monotonicity for rates above the current rate */
2c5a744d
S		 1228 for (rate = tx_rate; rate < size - 1; rate++) {
1229 if (ath_rc_priv->state[rate+1].per <
1230 ath_rc_priv->state[rate].per)
256b7759
S		 1231 ath_rc_priv->state[rate+1].per =
1232 ath_rc_priv->state[rate].per;
f078f209
LR		 1233 }
1234
1235 /* Every so often, we reduce the thresholds and
1236 * PER (different for CCK and OFDM). */
256b7759 1237 if (now_msec - ath_rc_priv->rssi_down_time >=
dc2222a8 1238 rate_table->rssi_reduce_interval) {
f078f209 1239
2c5a744d 1240 for (rate = 0; rate < size; rate++) {
256b7759 1241 if (ath_rc_priv->state[rate].rssi_thres >
dc2222a8 1242 rate_table->info[rate].rssi_ack_validmin)
256b7759 1243 ath_rc_priv->state[rate].rssi_thres -= 1;
f078f209 1244 }
256b7759 1245 ath_rc_priv->rssi_down_time = now_msec;
f078f209
LR		 1246 }
1247
1248 /* Every so often, we reduce the thresholds
1249 * and PER (different for CCK and OFDM). */
256b7759 1250 if (now_msec - ath_rc_priv->per_down_time >=
dc2222a8 1251 rate_table->rssi_reduce_interval) {
2c5a744d 1252 for (rate = 0; rate < size; rate++) {
256b7759
S		 1253 ath_rc_priv->state[rate].per =
1254 7 * ath_rc_priv->state[rate].per / 8;
f078f209
LR		 1255 }
1256
256b7759 1257 ath_rc_priv->per_down_time = now_msec;
f078f209 1258 }
2c5a744d 1259
9e712790
S		 1260 ath_debug_stat_retries(sc, tx_rate, xretries, retries,
1261 ath_rc_priv->state[tx_rate].per);
029bc432 1262
2c5a744d
S		 1263#undef CHK_RSSI
1264}
1265
4f0fc7c3 1266static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
2c5a744d
S		 1267 struct ieee80211_tx_rate *rate)
1268{
1269 int rix;
1270
1271 if ((rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1272 (rate->flags & IEEE80211_TX_RC_SHORT_GI))
1273 rix = rate_table->info[rate->idx].ht_index;
1274 else if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
1275 rix = rate_table->info[rate->idx].sgi_index;
1276 else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1277 rix = rate_table->info[rate->idx].cw40index;
1278 else
1279 rix = rate_table->info[rate->idx].base_index;
1280
1281 return rix;
f078f209
LR		 1282}
1283
46d14a58
S		 1284static void ath_rc_tx_status(struct ath_softc *sc,
1285 struct ath_rate_priv *ath_rc_priv,
1286 struct ieee80211_tx_info *tx_info,
1287 int final_ts_idx, int xretries, int long_retry)
f078f209 1288{
46d14a58 1289 struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
4f0fc7c3 1290 const struct ath_rate_table *rate_table;
a8efee4f 1291 struct ieee80211_tx_rate *rates = tx_info->status.rates;
f078f209 1292 u8 flags;
2c5a744d 1293 u32 i = 0, rix;
f078f209 1294
40990ec0 1295 rate_table = sc->cur_rate_table;
f078f209
LR		 1296
1297 /*
1298 * If the first rate is not the final index, there
1299 * are intermediate rate failures to be processed.
1300 */
1301 if (final_ts_idx != 0) {
1302 /* Process intermediate rates that failed.*/
2c5a744d
S		 1303 for (i = 0; i < final_ts_idx ; i++) {
1304 if (rates[i].count != 0 && (rates[i].idx >= 0)) {
1305 flags = rates[i].flags;
1306
f078f209
LR		 1307 /* If HT40 and we have switched mode from
1308 * 40 to 20 => don't update */
2c5a744d 1309
a8efee4f 1310 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
f5c38ef0 1311 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
f078f209 1312 return;
e63835b0 1313
2c5a744d 1314 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
f078f209 1315 ath_rc_update_ht(sc, ath_rc_priv,
46d14a58 1316 tx_info_priv, rix,
f078f209 1317 xretries ? 1 : 2,
2c5a744d 1318 rates[i].count);
f078f209
LR		 1319 }
1320 }
1321 } else {
1322 /*
1323 * Handle the special case of MIMO PS burst, where the second
1324 * aggregate is sent out with only one rate and one try.
1325 * Treating it as an excessive retry penalizes the rate
1326 * inordinately.
1327 */
a8efee4f 1328 if (rates[0].count == 1 && xretries == 1)
f078f209
LR		 1329 xretries = 2;
1330 }
1331
2c5a744d
S		 1332 flags = rates[i].flags;
1333
f078f209 1334 /* If HT40 and we have switched mode from 40 to 20 => don't update */
a8efee4f 1335 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
f5c38ef0 1336 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
f078f209
LR		 1337 return;
1338
2c5a744d 1339 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
46d14a58 1340 ath_rc_update_ht(sc, ath_rc_priv, tx_info_priv, rix,
2c5a744d 1341 xretries, long_retry);
f078f209
LR		 1342}
1343
4f0fc7c3
LR		 1344static const
1345struct ath_rate_table *ath_choose_rate_table(struct ath_softc *sc,
1346 enum ieee80211_band band,
1347 bool is_ht,
1348 bool is_cw_40)
e11602b7
S		 1349{
1350 int mode = 0;
1351
1352 switch(band) {
1353 case IEEE80211_BAND_2GHZ:
1354 mode = ATH9K_MODE_11G;
1355 if (is_ht)
1356 mode = ATH9K_MODE_11NG_HT20;
1357 if (is_cw_40)
1358 mode = ATH9K_MODE_11NG_HT40PLUS;
1359 break;
1360 case IEEE80211_BAND_5GHZ:
1361 mode = ATH9K_MODE_11A;
1362 if (is_ht)
1363 mode = ATH9K_MODE_11NA_HT20;
1364 if (is_cw_40)
1365 mode = ATH9K_MODE_11NA_HT40PLUS;
1366 break;
1367 default:
04bd4638 1368 DPRINTF(sc, ATH_DBG_CONFIG, "Invalid band\n");
e11602b7
S		 1369 return NULL;
1370 }
1371
1372 BUG_ON(mode >= ATH9K_MODE_MAX);
1373
04bd4638 1374 DPRINTF(sc, ATH_DBG_CONFIG, "Choosing rate table for mode: %d\n", mode);
e11602b7
S		 1375 return sc->hw_rate_table[mode];
1376}
1377
5ddfac3b 1378static void ath_rc_init(struct ath_softc *sc,
46d14a58 1379 struct ath_rate_priv *ath_rc_priv,
5ddfac3b 1380 struct ieee80211_supported_band *sband,
9331ec80 1381 struct ieee80211_sta *sta,
4f0fc7c3 1382 const struct ath_rate_table *rate_table)
f078f209 1383{
5ddfac3b
S		 1384 struct ath_rateset *rateset = &ath_rc_priv->neg_rates;
1385 u8 *ht_mcs = (u8 *)&ath_rc_priv->neg_ht_rates;
f078f209 1386 u8 i, j, k, hi = 0, hthi = 0;
f078f209 1387
e11602b7
S		 1388 if (!rate_table) {
1389 DPRINTF(sc, ATH_DBG_FATAL, "Rate table not initialized\n");
1390 return;
1391 }
5ddfac3b 1392
f078f209
LR		 1393 /* Initial rate table size. Will change depending
1394 * on the working rate set */
46d14a58 1395 ath_rc_priv->rate_table_size = RATE_TABLE_SIZE;
f078f209
LR		 1396
1397 /* Initialize thresholds according to the global rate table */
5ddfac3b 1398 for (i = 0 ; i < ath_rc_priv->rate_table_size; i++) {
256b7759 1399 ath_rc_priv->state[i].rssi_thres =
f078f209 1400 rate_table->info[i].rssi_ack_validmin;
256b7759 1401 ath_rc_priv->state[i].per = 0;
f078f209
LR		 1402 }
1403
1404 /* Determine the valid rates */
256b7759 1405 ath_rc_init_valid_txmask(ath_rc_priv);
f078f209
LR		 1406
1407 for (i = 0; i < WLAN_RC_PHY_MAX; i++) {
1408 for (j = 0; j < MAX_TX_RATE_PHY; j++)
256b7759
S		 1409 ath_rc_priv->valid_phy_rateidx[i][j] = 0;
1410 ath_rc_priv->valid_phy_ratecnt[i] = 0;
f078f209 1411 }
f078f209 1412
f078f209
LR		 1413 if (!rateset->rs_nrates) {
1414 /* No working rate, just initialize valid rates */
2c5a744d 1415 hi = ath_rc_init_validrates(ath_rc_priv, rate_table,
c89424df 1416 ath_rc_priv->ht_cap);
f078f209
LR		 1417 } else {
1418 /* Use intersection of working rates and valid rates */
2c5a744d 1419 hi = ath_rc_setvalid_rates(ath_rc_priv, rate_table,
c89424df 1420 rateset, ath_rc_priv->ht_cap);
5ddfac3b 1421 if (ath_rc_priv->ht_cap & WLAN_RC_HT_FLAG) {
2c5a744d 1422 hthi = ath_rc_setvalid_htrates(ath_rc_priv,
c89424df
S		 1423 rate_table,
1424 ht_mcs,
1425 ath_rc_priv->ht_cap);
f078f209
LR		 1426 }
1427 hi = A_MAX(hi, hthi);
1428 }
1429
256b7759
S		 1430 ath_rc_priv->rate_table_size = hi + 1;
1431 ath_rc_priv->rate_max_phy = 0;
46d14a58 1432 ASSERT(ath_rc_priv->rate_table_size <= RATE_TABLE_SIZE);
f078f209
LR		 1433
1434 for (i = 0, k = 0; i < WLAN_RC_PHY_MAX; i++) {
256b7759
S		 1435 for (j = 0; j < ath_rc_priv->valid_phy_ratecnt[i]; j++) {
1436 ath_rc_priv->valid_rate_index[k++] =
1437 ath_rc_priv->valid_phy_rateidx[i][j];
f078f209
LR		 1438 }
1439
46d14a58 1440 if (!ath_rc_valid_phyrate(i, rate_table->initial_ratemax, 1)
256b7759 1441 || !ath_rc_priv->valid_phy_ratecnt[i])
f078f209
LR		 1442 continue;
1443
256b7759 1444 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_phy_rateidx[i][j-1];
f078f209 1445 }
46d14a58
S		 1446 ASSERT(ath_rc_priv->rate_table_size <= RATE_TABLE_SIZE);
1447 ASSERT(k <= RATE_TABLE_SIZE);
f078f209 1448
256b7759 1449 ath_rc_priv->max_valid_rate = k;
256b7759
S		 1450 ath_rc_sort_validrates(rate_table, ath_rc_priv);
1451 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
40990ec0 1452 sc->cur_rate_table = rate_table;
9331ec80
S		 1453
1454 DPRINTF(sc, ATH_DBG_CONFIG, "RC Initialized with capabilities: 0x%x\n",
1455 ath_rc_priv->ht_cap);
f078f209
LR		 1456}
1457
c2da50e5
S		 1458static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta,
1459 bool is_cw40, bool is_sgi40)
9331ec80
S		 1460{
1461 u8 caps = 0;
1462
c2da50e5 1463 if (sta->ht_cap.ht_supported) {
9331ec80
S		 1464 caps = WLAN_RC_HT_FLAG;
1465 if (sc->sc_ah->caps.tx_chainmask != 1 &&
c2da50e5
S		 1466 ath9k_hw_getcapability(sc->sc_ah, ATH9K_CAP_DS, 0, NULL)) {
1467 if (sta->ht_cap.mcs.rx_mask[1])
1468 caps |= WLAN_RC_DS_FLAG;
1469 }
9331ec80
S		 1470 if (is_cw40)
1471 caps |= WLAN_RC_40_FLAG;
1472 if (is_sgi40)
1473 caps |= WLAN_RC_SGI_FLAG;
1474 }
1475
1476 return caps;
1477}
1478
1479/***********************************/
1480/* mac80211 Rate Control callbacks */
1481/***********************************/
1482
4b7679a5
JB		 1483static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
1484 struct ieee80211_sta *sta, void *priv_sta,
f078f209
LR		 1485 struct sk_buff *skb)
1486{
1487 struct ath_softc *sc = priv;
46d14a58
S		 1488 struct ath_rate_priv *ath_rc_priv = priv_sta;
1489 struct ath_tx_info_priv *tx_info_priv = NULL;
f078f209
LR		 1490 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1491 struct ieee80211_hdr *hdr;
46d14a58 1492 int final_ts_idx, tx_status = 0, is_underrun = 0;
f078f209
LR		 1493 __le16 fc;
1494
f078f209
LR		 1495 hdr = (struct ieee80211_hdr *)skb->data;
1496 fc = hdr->frame_control;
46d14a58 1497 tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
46d14a58 1498 final_ts_idx = tx_info_priv->tx.ts_rateindex;
f078f209 1499
ff37e337 1500 if (!priv_sta || !ieee80211_is_data(fc) ||
7ac47010 1501 !tx_info_priv->update_rc)
46d14a58 1502 goto exit;
e6a9854b 1503
46d14a58
S		 1504 if (tx_info_priv->tx.ts_status & ATH9K_TXERR_FILT)
1505 goto exit;
e6a9854b 1506
46d14a58
S		 1507 /*
1508 * If underrun error is seen assume it as an excessive retry only
1509 * if prefetch trigger level have reached the max (0x3f for 5416)
dd190183 1510 * Adjust the long retry as if the frame was tried hw->max_rate_tries
46d14a58
S		 1511 * times. This affects how ratectrl updates PER for the failed rate.
1512 */
1513 if (tx_info_priv->tx.ts_flags &
1514 (ATH9K_TX_DATA_UNDERRUN | ATH9K_TX_DELIM_UNDERRUN) &&
2660b81a 1515 ((sc->sc_ah->tx_trig_level) >= ath_rc_priv->tx_triglevel_max)) {
46d14a58
S		 1516 tx_status = 1;
1517 is_underrun = 1;
1518 }
1519
1520 if ((tx_info_priv->tx.ts_status & ATH9K_TXERR_XRETRY) ||
1521 (tx_info_priv->tx.ts_status & ATH9K_TXERR_FIFO))
1522 tx_status = 1;
1523
1524 ath_rc_tx_status(sc, ath_rc_priv, tx_info, final_ts_idx, tx_status,
dd190183 1525 (is_underrun) ? sc->hw->max_rate_tries :
46d14a58
S		 1526 tx_info_priv->tx.ts_longretry);
1527
d22b0022 1528 /* Check if aggregation has to be enabled for this tid */
d5c232ff
VT		 1529 if (conf_is_ht(&sc->hw->conf) &&
1530 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
d22b0022
S		 1531 if (ieee80211_is_data_qos(fc)) {
1532 u8 *qc, tid;
1533 struct ath_node *an;
1534
1535 qc = ieee80211_get_qos_ctl(hdr);
1536 tid = qc[0] & 0xf;
1537 an = (struct ath_node *)sta->drv_priv;
1538
1539 if(ath_tx_aggr_check(sc, an, tid))
1540 ieee80211_start_tx_ba_session(sc->hw, hdr->addr1, tid);
1541 }
1542 }
7a7dec65
S		 1543
1544 ath_debug_stat_rc(sc, skb);
46d14a58 1545exit:
e6a9854b 1546 kfree(tx_info_priv);
f078f209
LR		 1547}
1548
e6a9854b
JB		 1549static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
1550 struct ieee80211_tx_rate_control *txrc)
f078f209 1551{
e6a9854b
JB		 1552 struct ieee80211_supported_band *sband = txrc->sband;
1553 struct sk_buff *skb = txrc->skb;
f078f209 1554 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
3900898c 1555 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
4b7679a5 1556 struct ath_softc *sc = priv;
46d14a58 1557 struct ath_rate_priv *ath_rc_priv = priv_sta;
f078f209 1558 __le16 fc = hdr->frame_control;
f078f209 1559
97d3f458
GS		 1560 /* lowest rate for management and NO_ACK frames */
1561 if (!ieee80211_is_data(fc) ||
1562 tx_info->flags & IEEE80211_TX_CTL_NO_ACK || !sta) {
a8efee4f
S		 1563 tx_info->control.rates[0].idx = rate_lowest_index(sband, sta);
1564 tx_info->control.rates[0].count =
97d3f458
GS		 1565 (tx_info->flags & IEEE80211_TX_CTL_NO_ACK) ?
1566 1 : ATH_MGT_TXMAXTRY;
f078f209
LR		 1567 return;
1568 }
1569
f078f209 1570 /* Find tx rate for unicast frames */
3900898c 1571 ath_rc_ratefind(sc, ath_rc_priv, txrc);
f078f209
LR		 1572}
1573
4b7679a5
JB		 1574static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
1575 struct ieee80211_sta *sta, void *priv_sta)
f078f209 1576{
4b7679a5 1577 struct ath_softc *sc = priv;
46d14a58 1578 struct ath_rate_priv *ath_rc_priv = priv_sta;
4f0fc7c3 1579 const struct ath_rate_table *rate_table = NULL;
9331ec80 1580 bool is_cw40, is_sgi40;
f078f209
LR		 1581 int i, j = 0;
1582
7b4d2735
S		 1583 for (i = 0; i < sband->n_bitrates; i++) {
1584 if (sta->supp_rates[sband->band] & BIT(i)) {
1585 ath_rc_priv->neg_rates.rs_rates[j]
1586 = (sband->bitrates[i].bitrate * 2) / 10;
1587 j++;
1588 }
1589 }
1590 ath_rc_priv->neg_rates.rs_nrates = j;
f078f209 1591
a4510bf8 1592 if (sta->ht_cap.ht_supported) {
7b4d2735 1593 for (i = 0, j = 0; i < 77; i++) {
ae5eb026 1594 if (sta->ht_cap.mcs.rx_mask[i/8] & (1<<(i%8)))
dc2222a8 1595 ath_rc_priv->neg_ht_rates.rs_rates[j++] = i;
f078f209
LR		 1596 if (j == ATH_RATE_MAX)
1597 break;
1598 }
dc2222a8 1599 ath_rc_priv->neg_ht_rates.rs_nrates = j;
f078f209 1600 }
7b4d2735 1601
9331ec80
S		 1602 is_cw40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
1603 is_sgi40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
1604
1605 /* Choose rate table first */
1606
1607 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) ||
9cb5412b 1608 (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) ||
9331ec80
S		 1609 (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC)) {
1610 rate_table = ath_choose_rate_table(sc, sband->band,
1611 sta->ht_cap.ht_supported,
1612 is_cw40);
1613 } else if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
1614 /* cur_rate_table would be set on init through config() */
1615 rate_table = sc->cur_rate_table;
1616 }
1617
c2da50e5 1618 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta, is_cw40, is_sgi40);
9331ec80
S		 1619 ath_rc_init(sc, priv_sta, sband, sta, rate_table);
1620}
1621
1622static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
1623 struct ieee80211_sta *sta, void *priv_sta,
1624 u32 changed)
1625{
1626 struct ath_softc *sc = priv;
1627 struct ath_rate_priv *ath_rc_priv = priv_sta;
4f0fc7c3 1628 const struct ath_rate_table *rate_table = NULL;
9331ec80
S		 1629 bool oper_cw40 = false, oper_sgi40;
1630 bool local_cw40 = (ath_rc_priv->ht_cap & WLAN_RC_40_FLAG) ?
1631 true : false;
1632 bool local_sgi40 = (ath_rc_priv->ht_cap & WLAN_RC_SGI_FLAG) ?
1633 true : false;
1634
1635 /* FIXME: Handle AP mode later when we support CWM */
1636
1637 if (changed & IEEE80211_RC_HT_CHANGED) {
1638 if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
1639 return;
1640
1641 if (sc->hw->conf.channel_type == NL80211_CHAN_HT40MINUS ||
1642 sc->hw->conf.channel_type == NL80211_CHAN_HT40PLUS)
1643 oper_cw40 = true;
1644
1645 oper_sgi40 = (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40) ?
1646 true : false;
1647
1648 if ((local_cw40 != oper_cw40) || (local_sgi40 != oper_sgi40)) {
1649 rate_table = ath_choose_rate_table(sc, sband->band,
1650 sta->ht_cap.ht_supported,
1651 oper_cw40);
c2da50e5 1652 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta,
9331ec80
S		 1653 oper_cw40, oper_sgi40);
1654 ath_rc_init(sc, priv_sta, sband, sta, rate_table);
1655
1656 DPRINTF(sc, ATH_DBG_CONFIG,
1657 "Operating HT Bandwidth changed to: %d\n",
1658 sc->hw->conf.channel_type);
1659 }
1660 }
f078f209
LR		 1661}
1662
4b7679a5 1663static void *ath_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
f078f209 1664{
bce048d7
JM		 1665 struct ath_wiphy *aphy = hw->priv;
1666 return aphy->sc;
f078f209
LR		 1667}
1668
1669static void ath_rate_free(void *priv)
1670{
1671 return;
1672}
1673
4b7679a5 1674static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
f078f209
LR		 1675{
1676 struct ath_softc *sc = priv;
46d14a58 1677 struct ath_rate_priv *rate_priv;
f078f209 1678
46d14a58 1679 rate_priv = kzalloc(sizeof(struct ath_rate_priv), gfp);
f078f209 1680 if (!rate_priv) {
dc2222a8 1681 DPRINTF(sc, ATH_DBG_FATAL,
04bd4638 1682 "Unable to allocate private rc structure\n");
f078f209
LR		 1683 return NULL;
1684 }
fe60594a 1685
fe60594a 1686 rate_priv->rssi_down_time = jiffies_to_msecs(jiffies);
2660b81a 1687 rate_priv->tx_triglevel_max = sc->sc_ah->caps.tx_triglevel_max;
dc2222a8 1688
f078f209
LR		 1689 return rate_priv;
1690}
1691
4b7679a5
JB		 1692static void ath_rate_free_sta(void *priv, struct ieee80211_sta *sta,
1693 void *priv_sta)
f078f209 1694{
46d14a58 1695 struct ath_rate_priv *rate_priv = priv_sta;
fe60594a 1696 kfree(rate_priv);
f078f209
LR		 1697}
1698
1699static struct rate_control_ops ath_rate_ops = {
1700 .module = NULL,
1701 .name = "ath9k_rate_control",
1702 .tx_status = ath_tx_status,
1703 .get_rate = ath_get_rate,
1704 .rate_init = ath_rate_init,
9331ec80 1705 .rate_update = ath_rate_update,
f078f209
LR		 1706 .alloc = ath_rate_alloc,
1707 .free = ath_rate_free,
1708 .alloc_sta = ath_rate_alloc_sta,
4b7679a5 1709 .free_sta = ath_rate_free_sta,
f078f209
LR		 1710};
1711
fe7f4a77
S		 1712void ath_rate_attach(struct ath_softc *sc)
1713{
1714 sc->hw_rate_table[ATH9K_MODE_11B] =
1715 &ar5416_11b_ratetable;
1716 sc->hw_rate_table[ATH9K_MODE_11A] =
1717 &ar5416_11a_ratetable;
1718 sc->hw_rate_table[ATH9K_MODE_11G] =
1719 &ar5416_11g_ratetable;
1720 sc->hw_rate_table[ATH9K_MODE_11NA_HT20] =
1721 &ar5416_11na_ratetable;
1722 sc->hw_rate_table[ATH9K_MODE_11NG_HT20] =
1723 &ar5416_11ng_ratetable;
1724 sc->hw_rate_table[ATH9K_MODE_11NA_HT40PLUS] =
1725 &ar5416_11na_ratetable;
1726 sc->hw_rate_table[ATH9K_MODE_11NA_HT40MINUS] =
1727 &ar5416_11na_ratetable;
1728 sc->hw_rate_table[ATH9K_MODE_11NG_HT40PLUS] =
1729 &ar5416_11ng_ratetable;
1730 sc->hw_rate_table[ATH9K_MODE_11NG_HT40MINUS] =
1731 &ar5416_11ng_ratetable;
1732}
1733
f078f209
LR		 1734int ath_rate_control_register(void)
1735{
1736 return ieee80211_rate_control_register(&ath_rate_ops);
1737}
1738
1739void ath_rate_control_unregister(void)
1740{
1741 ieee80211_rate_control_unregister(&ath_rate_ops);
1742}
Linux kernel - Deliverables
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