blob: 600ee0ba2880e07d76d9be805bc15aefedc43d87 [file] [log] [blame]
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001/*
2 * Copyright (c) 2004 Video54 Technologies, Inc.
Sujithcee075a2009-03-13 09:07:23 +05303 * Copyright (c) 2004-2009 Atheros Communications, Inc.
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07004 *
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
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
19
Sujith394cf0a2009-02-09 13:26:54 +053020#include "ath9k.h"
Luis R. Rodriguezf078f202008-08-04 00:16:41 -070021
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -040022static const struct ath_rate_table ar5416_11na_ratetable = {
Vasanthakumar Thiagarajan9e55ba72010-06-02 17:22:47 -070023 43,
Felix Fietkau545750d2009-11-23 22:21:01 +010024 8, /* MCS start */
Luis R. Rodriguezf078f202008-08-04 00:16:41 -070025 {
Sujith46d14a52008-11-18 09:08:13 +053026 { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +010027 5400, 0, 12, 0, 0, 0, 0, 0 },
Sujithe8324352009-01-16 21:38:42 +053028 { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +010029 7800, 1, 18, 0, 1, 1, 1, 1 },
Sujith46d14a52008-11-18 09:08:13 +053030 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +010031 10000, 2, 24, 2, 2, 2, 2, 2 },
Sujith46d14a52008-11-18 09:08:13 +053032 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +010033 13900, 3, 36, 2, 3, 3, 3, 3 },
Sujith46d14a52008-11-18 09:08:13 +053034 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +010035 17300, 4, 48, 4, 4, 4, 4, 4 },
Sujith46d14a52008-11-18 09:08:13 +053036 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +010037 23000, 5, 72, 4, 5, 5, 5, 5 },
Sujith46d14a52008-11-18 09:08:13 +053038 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +010039 27400, 6, 96, 4, 6, 6, 6, 6 },
Sujith46d14a52008-11-18 09:08:13 +053040 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +010041 29300, 7, 108, 4, 7, 7, 7, 7 },
Vasanthakumar Thiagarajan42e88562009-07-29 15:05:21 +053042 { VALID_2040, VALID_2040, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070043 6400, 0, 0, 0, 8, 25, 8, 25 },
Sujith46d14a52008-11-18 09:08:13 +053044 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070045 12700, 1, 1, 2, 9, 26, 9, 26 },
Sujith46d14a52008-11-18 09:08:13 +053046 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070047 18800, 2, 2, 2, 10, 27, 10, 27 },
Sujith46d14a52008-11-18 09:08:13 +053048 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070049 25000, 3, 3, 4, 11, 28, 11, 28 },
Sujith46d14a52008-11-18 09:08:13 +053050 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070051 36700, 4, 4, 4, 12, 29, 12, 29 },
Sujith46d14a52008-11-18 09:08:13 +053052 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070053 48100, 5, 5, 4, 13, 30, 13, 30 },
Sujith46d14a52008-11-18 09:08:13 +053054 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070055 53500, 6, 6, 4, 14, 31, 14, 31 },
Sujith46d14a52008-11-18 09:08:13 +053056 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070057 59000, 7, 7, 4, 15, 32, 15, 33 },
Sujith46d14a52008-11-18 09:08:13 +053058 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070059 12700, 8, 8, 3, 16, 34, 16, 34 },
Sujith46d14a52008-11-18 09:08:13 +053060 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070061 24800, 9, 9, 2, 17, 35, 17, 35 },
Sujith46d14a52008-11-18 09:08:13 +053062 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070063 36600, 10, 10, 2, 18, 36, 18, 36 },
Sujith46d14a52008-11-18 09:08:13 +053064 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070065 48100, 11, 11, 4, 19, 37, 19, 37 },
Sujith46d14a52008-11-18 09:08:13 +053066 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070067 69500, 12, 12, 4, 20, 38, 20, 38 },
Sujith46d14a52008-11-18 09:08:13 +053068 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070069 89500, 13, 13, 4, 21, 39, 21, 39 },
Sujith46d14a52008-11-18 09:08:13 +053070 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070071 98900, 14, 14, 4, 22, 40, 22, 40 },
Sujith46d14a52008-11-18 09:08:13 +053072 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070073 108300, 15, 15, 4, 23, 41, 24, 42 },
74 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS_HGI, 144400, /* 144.4 Mb */
75 12000, 15, 15, 4, 23, 41, 24, 42 },
Sujith46d14a52008-11-18 09:08:13 +053076 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070077 13200, 0, 0, 0, 8, 25, 25, 25 },
Sujith46d14a52008-11-18 09:08:13 +053078 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070079 25900, 1, 1, 2, 9, 26, 26, 26 },
Sujith46d14a52008-11-18 09:08:13 +053080 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070081 38600, 2, 2, 2, 10, 27, 27, 27 },
Sujith46d14a52008-11-18 09:08:13 +053082 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070083 49800, 3, 3, 4, 11, 28, 28, 28 },
Sujith46d14a52008-11-18 09:08:13 +053084 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070085 72200, 4, 4, 4, 12, 29, 29, 29 },
Sujith46d14a52008-11-18 09:08:13 +053086 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070087 92900, 5, 5, 4, 13, 30, 30, 30 },
Sujith46d14a52008-11-18 09:08:13 +053088 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070089 102700, 6, 6, 4, 14, 31, 31, 31 },
Sujith46d14a52008-11-18 09:08:13 +053090 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070091 112000, 7, 7, 4, 15, 32, 33, 33 },
Sujith46d14a52008-11-18 09:08:13 +053092 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070093 122000, 7, 7, 4, 15, 32, 33, 33 },
Sujith46d14a52008-11-18 09:08:13 +053094 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070095 25800, 8, 8, 0, 16, 34, 34, 34 },
Sujith46d14a52008-11-18 09:08:13 +053096 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070097 49800, 9, 9, 2, 17, 35, 35, 35 },
Sujith46d14a52008-11-18 09:08:13 +053098 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -070099 71900, 10, 10, 2, 18, 36, 36, 36 },
Sujith46d14a52008-11-18 09:08:13 +0530100 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700101 92500, 11, 11, 4, 19, 37, 37, 37 },
Sujith46d14a52008-11-18 09:08:13 +0530102 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700103 130300, 12, 12, 4, 20, 38, 38, 38 },
Sujith46d14a52008-11-18 09:08:13 +0530104 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700105 162800, 13, 13, 4, 21, 39, 39, 39 },
Sujith46d14a52008-11-18 09:08:13 +0530106 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700107 178200, 14, 14, 4, 22, 40, 40, 40 },
Sujith46d14a52008-11-18 09:08:13 +0530108 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700109 192100, 15, 15, 4, 23, 41, 42, 42 },
Sujith46d14a52008-11-18 09:08:13 +0530110 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700111 207000, 15, 15, 4, 23, 41, 42, 42 },
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700112 },
113 50, /* probe interval */
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700114 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
115};
116
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700117/* 4ms frame limit not used for NG mode. The values filled
118 * for HT are the 64K max aggregate limit */
119
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400120static const struct ath_rate_table ar5416_11ng_ratetable = {
Vasanthakumar Thiagarajan9e55ba72010-06-02 17:22:47 -0700121 47,
Felix Fietkau545750d2009-11-23 22:21:01 +0100122 12, /* MCS start */
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700123 {
Sujith46d14a52008-11-18 09:08:13 +0530124 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100125 900, 0, 2, 0, 0, 0, 0, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530126 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100127 1900, 1, 4, 1, 1, 1, 1, 1 },
Sujith46d14a52008-11-18 09:08:13 +0530128 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100129 4900, 2, 11, 2, 2, 2, 2, 2 },
Sujith46d14a52008-11-18 09:08:13 +0530130 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100131 8100, 3, 22, 3, 3, 3, 3, 3 },
Sujith46d14a52008-11-18 09:08:13 +0530132 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100133 5400, 4, 12, 4, 4, 4, 4, 4 },
Sujith46d14a52008-11-18 09:08:13 +0530134 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100135 7800, 5, 18, 4, 5, 5, 5, 5 },
Sujith46d14a52008-11-18 09:08:13 +0530136 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100137 10100, 6, 24, 6, 6, 6, 6, 6 },
Sujith46d14a52008-11-18 09:08:13 +0530138 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100139 14100, 7, 36, 6, 7, 7, 7, 7 },
Sujith46d14a52008-11-18 09:08:13 +0530140 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100141 17700, 8, 48, 8, 8, 8, 8, 8 },
Sujith46d14a52008-11-18 09:08:13 +0530142 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100143 23700, 9, 72, 8, 9, 9, 9, 9 },
Sujith46d14a52008-11-18 09:08:13 +0530144 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100145 27400, 10, 96, 8, 10, 10, 10, 10 },
Sujith46d14a52008-11-18 09:08:13 +0530146 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100147 30900, 11, 108, 8, 11, 11, 11, 11 },
Sujith46d14a52008-11-18 09:08:13 +0530148 { INVALID, INVALID, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700149 6400, 0, 0, 4, 12, 29, 12, 29 },
Sujith46d14a52008-11-18 09:08:13 +0530150 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700151 12700, 1, 1, 6, 13, 30, 13, 30 },
Sujith46d14a52008-11-18 09:08:13 +0530152 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700153 18800, 2, 2, 6, 14, 31, 14, 31 },
Sujith46d14a52008-11-18 09:08:13 +0530154 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700155 25000, 3, 3, 8, 15, 32, 15, 32 },
Sujith46d14a52008-11-18 09:08:13 +0530156 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700157 36700, 4, 4, 8, 16, 33, 16, 33 },
Sujith46d14a52008-11-18 09:08:13 +0530158 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700159 48100, 5, 5, 8, 17, 34, 17, 34 },
Sujith46d14a52008-11-18 09:08:13 +0530160 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700161 53500, 6, 6, 8, 18, 35, 18, 35 },
Sujith46d14a52008-11-18 09:08:13 +0530162 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700163 59000, 7, 7, 8, 19, 36, 19, 37 },
Sujith46d14a52008-11-18 09:08:13 +0530164 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700165 12700, 8, 8, 4, 20, 38, 20, 38 },
Sujith46d14a52008-11-18 09:08:13 +0530166 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700167 24800, 9, 9, 6, 21, 39, 21, 39 },
Sujith46d14a52008-11-18 09:08:13 +0530168 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700169 36600, 10, 10, 6, 22, 40, 22, 40 },
Sujith46d14a52008-11-18 09:08:13 +0530170 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700171 48100, 11, 11, 8, 23, 41, 23, 41 },
Sujith46d14a52008-11-18 09:08:13 +0530172 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700173 69500, 12, 12, 8, 24, 42, 24, 42 },
Sujith46d14a52008-11-18 09:08:13 +0530174 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700175 89500, 13, 13, 8, 25, 43, 25, 43 },
Sujith46d14a52008-11-18 09:08:13 +0530176 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700177 98900, 14, 14, 8, 26, 44, 26, 44 },
Sujith46d14a52008-11-18 09:08:13 +0530178 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700179 108300, 15, 15, 8, 27, 45, 28, 46 },
180 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS_HGI, 144400, /* 130 Mb */
181 120000, 15, 15, 8, 27, 45, 28, 46 },
Sujith46d14a52008-11-18 09:08:13 +0530182 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700183 13200, 0, 0, 8, 12, 29, 29, 29 },
Sujith46d14a52008-11-18 09:08:13 +0530184 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700185 25900, 1, 1, 8, 13, 30, 30, 30 },
Sujith46d14a52008-11-18 09:08:13 +0530186 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700187 38600, 2, 2, 8, 14, 31, 31, 31 },
Sujith46d14a52008-11-18 09:08:13 +0530188 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700189 49800, 3, 3, 8, 15, 32, 32, 32 },
Sujith46d14a52008-11-18 09:08:13 +0530190 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700191 72200, 4, 4, 8, 16, 33, 33, 33 },
Sujith46d14a52008-11-18 09:08:13 +0530192 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700193 92900, 5, 5, 8, 17, 34, 34, 34 },
Sujith46d14a52008-11-18 09:08:13 +0530194 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700195 102700, 6, 6, 8, 18, 35, 35, 35 },
Sujith46d14a52008-11-18 09:08:13 +0530196 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700197 112000, 7, 7, 8, 19, 36, 37, 37 },
Sujith46d14a52008-11-18 09:08:13 +0530198 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700199 122000, 7, 7, 8, 19, 36, 37, 37 },
Sujith46d14a52008-11-18 09:08:13 +0530200 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700201 25800, 8, 8, 8, 20, 38, 38, 38 },
Sujith46d14a52008-11-18 09:08:13 +0530202 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700203 49800, 9, 9, 8, 21, 39, 39, 39 },
Sujith46d14a52008-11-18 09:08:13 +0530204 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700205 71900, 10, 10, 8, 22, 40, 40, 40 },
Sujith46d14a52008-11-18 09:08:13 +0530206 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700207 92500, 11, 11, 8, 23, 41, 41, 41 },
Sujith46d14a52008-11-18 09:08:13 +0530208 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700209 130300, 12, 12, 8, 24, 42, 42, 42 },
Sujith46d14a52008-11-18 09:08:13 +0530210 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700211 162800, 13, 13, 8, 25, 43, 43, 43 },
Sujith46d14a52008-11-18 09:08:13 +0530212 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700213 178200, 14, 14, 8, 26, 44, 44, 44 },
Sujith46d14a52008-11-18 09:08:13 +0530214 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700215 192100, 15, 15, 8, 27, 45, 46, 46 },
Sujith46d14a52008-11-18 09:08:13 +0530216 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -0700217 207000, 15, 15, 8, 27, 45, 46, 46 },
Felix Fietkau1fe82342009-11-23 22:22:27 +0100218 },
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700219 50, /* probe interval */
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700220 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
221};
222
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400223static const struct ath_rate_table ar5416_11a_ratetable = {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700224 8,
Felix Fietkau545750d2009-11-23 22:21:01 +0100225 0,
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700226 {
Sujith46d14a52008-11-18 09:08:13 +0530227 { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100228 5400, 0, 12, 0, 0, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530229 { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100230 7800, 1, 18, 0, 1, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530231 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100232 10000, 2, 24, 2, 2, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530233 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100234 13900, 3, 36, 2, 3, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530235 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100236 17300, 4, 48, 4, 4, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530237 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100238 23000, 5, 72, 4, 5, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530239 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100240 27400, 6, 96, 4, 6, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530241 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100242 29300, 7, 108, 4, 7, 0 },
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700243 },
244 50, /* probe interval */
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700245 0, /* Phy rates allowed initially */
246};
247
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400248static const struct ath_rate_table ar5416_11g_ratetable = {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700249 12,
Felix Fietkau545750d2009-11-23 22:21:01 +0100250 0,
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700251 {
Sujith46d14a52008-11-18 09:08:13 +0530252 { VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100253 900, 0, 2, 0, 0, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530254 { VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100255 1900, 1, 4, 1, 1, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530256 { VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100257 4900, 2, 11, 2, 2, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530258 { VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100259 8100, 3, 22, 3, 3, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530260 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100261 5400, 4, 12, 4, 4, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530262 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100263 7800, 5, 18, 4, 5, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530264 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100265 10000, 6, 24, 6, 6, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530266 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100267 13900, 7, 36, 6, 7, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530268 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100269 17300, 8, 48, 8, 8, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530270 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100271 23000, 9, 72, 8, 9, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530272 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100273 27400, 10, 96, 8, 10, 0 },
Sujith46d14a52008-11-18 09:08:13 +0530274 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
Felix Fietkau1fe82342009-11-23 22:22:27 +0100275 29300, 11, 108, 8, 11, 0 },
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700276 },
277 50, /* probe interval */
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700278 0, /* Phy rates allowed initially */
279};
280
Felix Fietkau545750d2009-11-23 22:21:01 +0100281static const struct ath_rate_table *hw_rate_table[ATH9K_MODE_MAX] = {
282 [ATH9K_MODE_11A] = &ar5416_11a_ratetable,
283 [ATH9K_MODE_11G] = &ar5416_11g_ratetable,
284 [ATH9K_MODE_11NA_HT20] = &ar5416_11na_ratetable,
285 [ATH9K_MODE_11NG_HT20] = &ar5416_11ng_ratetable,
286 [ATH9K_MODE_11NA_HT40PLUS] = &ar5416_11na_ratetable,
287 [ATH9K_MODE_11NA_HT40MINUS] = &ar5416_11na_ratetable,
288 [ATH9K_MODE_11NG_HT40PLUS] = &ar5416_11ng_ratetable,
289 [ATH9K_MODE_11NG_HT40MINUS] = &ar5416_11ng_ratetable,
290};
291
292static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
293 struct ieee80211_tx_rate *rate);
294
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700295static inline int8_t median(int8_t a, int8_t b, int8_t c)
296{
297 if (a >= b) {
298 if (b >= c)
299 return b;
300 else if (a > c)
301 return c;
302 else
303 return a;
304 } else {
305 if (a >= c)
306 return a;
307 else if (b >= c)
308 return c;
309 else
310 return b;
311 }
312}
313
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400314static void ath_rc_sort_validrates(const struct ath_rate_table *rate_table,
Sujith46d14a52008-11-18 09:08:13 +0530315 struct ath_rate_priv *ath_rc_priv)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700316{
317 u8 i, j, idx, idx_next;
318
Sujith256b77592008-11-18 09:03:12 +0530319 for (i = ath_rc_priv->max_valid_rate - 1; i > 0; i--) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700320 for (j = 0; j <= i-1; j++) {
Sujith256b77592008-11-18 09:03:12 +0530321 idx = ath_rc_priv->valid_rate_index[j];
322 idx_next = ath_rc_priv->valid_rate_index[j+1];
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700323
324 if (rate_table->info[idx].ratekbps >
325 rate_table->info[idx_next].ratekbps) {
Sujith256b77592008-11-18 09:03:12 +0530326 ath_rc_priv->valid_rate_index[j] = idx_next;
327 ath_rc_priv->valid_rate_index[j+1] = idx;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700328 }
329 }
330 }
331}
332
Sujith46d14a52008-11-18 09:08:13 +0530333static void ath_rc_init_valid_txmask(struct ath_rate_priv *ath_rc_priv)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700334{
335 u8 i;
336
Sujith256b77592008-11-18 09:03:12 +0530337 for (i = 0; i < ath_rc_priv->rate_table_size; i++)
Sujith46d14a52008-11-18 09:08:13 +0530338 ath_rc_priv->valid_rate_index[i] = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700339}
340
Sujith46d14a52008-11-18 09:08:13 +0530341static inline void ath_rc_set_valid_txmask(struct ath_rate_priv *ath_rc_priv,
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700342 u8 index, int valid_tx_rate)
343{
Luis R. Rodriguez9680e8a2009-09-13 23:28:00 -0700344 BUG_ON(index > ath_rc_priv->rate_table_size);
Sujith46d14a52008-11-18 09:08:13 +0530345 ath_rc_priv->valid_rate_index[index] = valid_tx_rate ? 1 : 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700346}
347
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400348static inline
349int ath_rc_get_nextvalid_txrate(const struct ath_rate_table *rate_table,
350 struct ath_rate_priv *ath_rc_priv,
351 u8 cur_valid_txrate,
352 u8 *next_idx)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700353{
354 u8 i;
355
Sujith256b77592008-11-18 09:03:12 +0530356 for (i = 0; i < ath_rc_priv->max_valid_rate - 1; i++) {
357 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
358 *next_idx = ath_rc_priv->valid_rate_index[i+1];
Sujith46d14a52008-11-18 09:08:13 +0530359 return 1;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700360 }
361 }
362
363 /* No more valid rates */
364 *next_idx = 0;
Sujith2c5a7442008-11-18 09:08:33 +0530365
Sujith46d14a52008-11-18 09:08:13 +0530366 return 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700367}
368
369/* Return true only for single stream */
370
371static int ath_rc_valid_phyrate(u32 phy, u32 capflag, int ignore_cw)
372{
Jouni Malinenb657ead2009-01-13 14:33:49 +0200373 if (WLAN_RC_PHY_HT(phy) && !(capflag & WLAN_RC_HT_FLAG))
Sujith46d14a52008-11-18 09:08:13 +0530374 return 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700375 if (WLAN_RC_PHY_DS(phy) && !(capflag & WLAN_RC_DS_FLAG))
Sujith46d14a52008-11-18 09:08:13 +0530376 return 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700377 if (WLAN_RC_PHY_SGI(phy) && !(capflag & WLAN_RC_SGI_FLAG))
Sujith46d14a52008-11-18 09:08:13 +0530378 return 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700379 if (!ignore_cw && WLAN_RC_PHY_HT(phy))
380 if (WLAN_RC_PHY_40(phy) && !(capflag & WLAN_RC_40_FLAG))
Sujith46d14a52008-11-18 09:08:13 +0530381 return 0;
Sujith46d14a52008-11-18 09:08:13 +0530382 return 1;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700383}
384
385static inline int
Luis R. Rodriguez39448b02009-07-14 20:14:00 -0400386ath_rc_get_lower_rix(const struct ath_rate_table *rate_table,
387 struct ath_rate_priv *ath_rc_priv,
388 u8 cur_valid_txrate, u8 *next_idx)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700389{
390 int8_t i;
391
Sujith256b77592008-11-18 09:03:12 +0530392 for (i = 1; i < ath_rc_priv->max_valid_rate ; i++) {
393 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
394 *next_idx = ath_rc_priv->valid_rate_index[i-1];
Sujith46d14a52008-11-18 09:08:13 +0530395 return 1;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700396 }
397 }
Sujith2c5a7442008-11-18 09:08:33 +0530398
Sujith46d14a52008-11-18 09:08:13 +0530399 return 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700400}
401
Sujith2c5a7442008-11-18 09:08:33 +0530402static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400403 const struct ath_rate_table *rate_table,
Sujith2c5a7442008-11-18 09:08:33 +0530404 u32 capflag)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700405{
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700406 u8 i, hi = 0;
407 u32 valid;
408
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700409 for (i = 0; i < rate_table->rate_cnt; i++) {
Sujithc6483cf2009-03-30 15:28:56 +0530410 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
Sujithdc2222a2008-08-14 13:26:55 +0530411 rate_table->info[i].valid_single_stream :
412 rate_table->info[i].valid);
Sujith46d14a52008-11-18 09:08:13 +0530413 if (valid == 1) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700414 u32 phy = rate_table->info[i].phy;
415 u8 valid_rate_count = 0;
416
Sujith46d14a52008-11-18 09:08:13 +0530417 if (!ath_rc_valid_phyrate(phy, capflag, 0))
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700418 continue;
419
Sujith256b77592008-11-18 09:03:12 +0530420 valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700421
Sujith256b77592008-11-18 09:03:12 +0530422 ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = i;
423 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
Sujith46d14a52008-11-18 09:08:13 +0530424 ath_rc_set_valid_txmask(ath_rc_priv, i, 1);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700425 hi = A_MAX(hi, i);
426 }
427 }
Sujith2c5a7442008-11-18 09:08:33 +0530428
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700429 return hi;
430}
431
Sujith2c5a7442008-11-18 09:08:33 +0530432static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400433 const struct ath_rate_table *rate_table,
Sujith2c5a7442008-11-18 09:08:33 +0530434 struct ath_rateset *rateset,
435 u32 capflag)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700436{
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700437 u8 i, j, hi = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700438
439 /* Use intersection of working rates and valid rates */
440 for (i = 0; i < rateset->rs_nrates; i++) {
441 for (j = 0; j < rate_table->rate_cnt; j++) {
442 u32 phy = rate_table->info[j].phy;
Sujithc6483cf2009-03-30 15:28:56 +0530443 u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
444 rate_table->info[j].valid_single_stream :
445 rate_table->info[j].valid);
Sujith2c5a7442008-11-18 09:08:33 +0530446 u8 rate = rateset->rs_rates[i];
447 u8 dot11rate = rate_table->info[j].dot11rate;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700448
449 /* We allow a rate only if its valid and the
450 * capflag matches one of the validity
Sujith46d14a52008-11-18 09:08:13 +0530451 * (VALID/VALID_20/VALID_40) flags */
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700452
Felix Fietkau545750d2009-11-23 22:21:01 +0100453 if ((rate == dot11rate) &&
Sujith2c5a7442008-11-18 09:08:33 +0530454 ((valid & WLAN_RC_CAP_MODE(capflag)) ==
455 WLAN_RC_CAP_MODE(capflag)) &&
456 !WLAN_RC_PHY_HT(phy)) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700457 u8 valid_rate_count = 0;
458
Sujith46d14a52008-11-18 09:08:13 +0530459 if (!ath_rc_valid_phyrate(phy, capflag, 0))
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700460 continue;
461
462 valid_rate_count =
Sujith256b77592008-11-18 09:03:12 +0530463 ath_rc_priv->valid_phy_ratecnt[phy];
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700464
Sujith256b77592008-11-18 09:03:12 +0530465 ath_rc_priv->valid_phy_rateidx[phy]
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700466 [valid_rate_count] = j;
Sujith256b77592008-11-18 09:03:12 +0530467 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
Sujith46d14a52008-11-18 09:08:13 +0530468 ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700469 hi = A_MAX(hi, j);
470 }
471 }
472 }
Sujith2c5a7442008-11-18 09:08:33 +0530473
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700474 return hi;
475}
476
Sujith2c5a7442008-11-18 09:08:33 +0530477static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400478 const struct ath_rate_table *rate_table,
Sujith2c5a7442008-11-18 09:08:33 +0530479 u8 *mcs_set, u32 capflag)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700480{
Sujith2c5a7442008-11-18 09:08:33 +0530481 struct ath_rateset *rateset = (struct ath_rateset *)mcs_set;
482
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700483 u8 i, j, hi = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700484
485 /* Use intersection of working rates and valid rates */
Sujith2c5a7442008-11-18 09:08:33 +0530486 for (i = 0; i < rateset->rs_nrates; i++) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700487 for (j = 0; j < rate_table->rate_cnt; j++) {
488 u32 phy = rate_table->info[j].phy;
Sujithc6483cf2009-03-30 15:28:56 +0530489 u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
Sujithdc2222a2008-08-14 13:26:55 +0530490 rate_table->info[j].valid_single_stream :
491 rate_table->info[j].valid);
Sujith2c5a7442008-11-18 09:08:33 +0530492 u8 rate = rateset->rs_rates[i];
493 u8 dot11rate = rate_table->info[j].dot11rate;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700494
Felix Fietkau545750d2009-11-23 22:21:01 +0100495 if ((rate != dot11rate) || !WLAN_RC_PHY_HT(phy) ||
Sujithdc2222a2008-08-14 13:26:55 +0530496 !WLAN_RC_PHY_HT_VALID(valid, capflag))
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700497 continue;
498
Sujith46d14a52008-11-18 09:08:13 +0530499 if (!ath_rc_valid_phyrate(phy, capflag, 0))
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700500 continue;
501
Sujith256b77592008-11-18 09:03:12 +0530502 ath_rc_priv->valid_phy_rateidx[phy]
503 [ath_rc_priv->valid_phy_ratecnt[phy]] = j;
504 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
Sujith46d14a52008-11-18 09:08:13 +0530505 ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700506 hi = A_MAX(hi, j);
507 }
508 }
Sujith2c5a7442008-11-18 09:08:33 +0530509
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700510 return hi;
511}
512
Luis R. Rodriguez201c3b42009-07-14 20:14:04 -0400513/* Finds the highest rate index we can use */
514static u8 ath_rc_get_highest_rix(struct ath_softc *sc,
515 struct ath_rate_priv *ath_rc_priv,
516 const struct ath_rate_table *rate_table,
517 int *is_probing)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700518{
Vasanthakumar Thiagarajan39a4caf2009-07-14 20:14:10 -0400519 u32 best_thruput, this_thruput, now_msec;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700520 u8 rate, next_rate, best_rate, maxindex, minindex;
Vasanthakumar Thiagarajan39a4caf2009-07-14 20:14:10 -0400521 int8_t index = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700522
523 now_msec = jiffies_to_msecs(jiffies);
Vasanthakumar Thiagarajan39a4caf2009-07-14 20:14:10 -0400524 *is_probing = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700525 best_thruput = 0;
Sujith256b77592008-11-18 09:03:12 +0530526 maxindex = ath_rc_priv->max_valid_rate-1;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700527 minindex = 0;
528 best_rate = minindex;
529
530 /*
531 * Try the higher rate first. It will reduce memory moving time
532 * if we have very good channel characteristics.
533 */
534 for (index = maxindex; index >= minindex ; index--) {
535 u8 per_thres;
536
Sujith256b77592008-11-18 09:03:12 +0530537 rate = ath_rc_priv->valid_rate_index[index];
538 if (rate > ath_rc_priv->rate_max_phy)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700539 continue;
540
541 /*
542 * For TCP the average collision rate is around 11%,
543 * so we ignore PERs less than this. This is to
544 * prevent the rate we are currently using (whose
545 * PER might be in the 10-15 range because of TCP
546 * collisions) looking worse than the next lower
547 * rate whose PER has decayed close to 0. If we
548 * used to next lower rate, its PER would grow to
549 * 10-15 and we would be worse off then staying
550 * at the current rate.
551 */
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400552 per_thres = ath_rc_priv->per[rate];
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700553 if (per_thres < 12)
554 per_thres = 12;
555
556 this_thruput = rate_table->info[rate].user_ratekbps *
557 (100 - per_thres);
558
559 if (best_thruput <= this_thruput) {
560 best_thruput = this_thruput;
561 best_rate = rate;
562 }
563 }
564
565 rate = best_rate;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700566
567 /*
568 * Must check the actual rate (ratekbps) to account for
569 * non-monoticity of 11g's rate table
570 */
571
Sujith39008982009-01-30 14:29:15 +0530572 if (rate >= ath_rc_priv->rate_max_phy) {
Sujith256b77592008-11-18 09:03:12 +0530573 rate = ath_rc_priv->rate_max_phy;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700574
575 /* Probe the next allowed phy state */
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700576 if (ath_rc_get_nextvalid_txrate(rate_table,
Sujith39008982009-01-30 14:29:15 +0530577 ath_rc_priv, rate, &next_rate) &&
Sujith256b77592008-11-18 09:03:12 +0530578 (now_msec - ath_rc_priv->probe_time >
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700579 rate_table->probe_interval) &&
Sujith256b77592008-11-18 09:03:12 +0530580 (ath_rc_priv->hw_maxretry_pktcnt >= 1)) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700581 rate = next_rate;
Sujith256b77592008-11-18 09:03:12 +0530582 ath_rc_priv->probe_rate = rate;
583 ath_rc_priv->probe_time = now_msec;
584 ath_rc_priv->hw_maxretry_pktcnt = 0;
Sujith46d14a52008-11-18 09:08:13 +0530585 *is_probing = 1;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700586 }
587 }
588
Sujith256b77592008-11-18 09:03:12 +0530589 if (rate > (ath_rc_priv->rate_table_size - 1))
590 rate = ath_rc_priv->rate_table_size - 1;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700591
Luis R. Rodrigueze43419f2009-07-14 20:13:54 -0400592 if (rate_table->info[rate].valid &&
593 (ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
594 return rate;
595
596 if (rate_table->info[rate].valid_single_stream &&
Luis R. Rodrigueze55ea2b2009-10-28 20:19:06 -0400597 !(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
Luis R. Rodrigueze43419f2009-07-14 20:13:54 -0400598 return rate;
599
600 /* This should not happen */
601 WARN_ON(1);
602
603 rate = ath_rc_priv->valid_rate_index[0];
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700604
605 return rate;
606}
607
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400608static void ath_rc_rate_set_series(const struct ath_rate_table *rate_table,
Sujitha8efee42008-11-18 09:07:30 +0530609 struct ieee80211_tx_rate *rate,
Sujithc89424d2009-01-30 14:29:28 +0530610 struct ieee80211_tx_rate_control *txrc,
Sujith2c5a7442008-11-18 09:08:33 +0530611 u8 tries, u8 rix, int rtsctsenable)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700612{
Sujitha8efee42008-11-18 09:07:30 +0530613 rate->count = tries;
Felix Fietkau545750d2009-11-23 22:21:01 +0100614 rate->idx = rate_table->info[rix].ratecode;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700615
Sujithc89424d2009-01-30 14:29:28 +0530616 if (txrc->short_preamble)
617 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
618 if (txrc->rts || rtsctsenable)
Sujitha8efee42008-11-18 09:07:30 +0530619 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
Felix Fietkau545750d2009-11-23 22:21:01 +0100620
621 if (WLAN_RC_PHY_HT(rate_table->info[rix].phy)) {
Sujitha8efee42008-11-18 09:07:30 +0530622 rate->flags |= IEEE80211_TX_RC_MCS;
Felix Fietkau545750d2009-11-23 22:21:01 +0100623 if (WLAN_RC_PHY_40(rate_table->info[rix].phy))
624 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
625 if (WLAN_RC_PHY_SGI(rate_table->info[rix].phy))
626 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
627 }
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700628}
629
Sujithc89424d2009-01-30 14:29:28 +0530630static void ath_rc_rate_set_rtscts(struct ath_softc *sc,
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400631 const struct ath_rate_table *rate_table,
Sujithc89424d2009-01-30 14:29:28 +0530632 struct ieee80211_tx_info *tx_info)
633{
634 struct ieee80211_tx_rate *rates = tx_info->control.rates;
635 int i = 0, rix = 0, cix, enable_g_protection = 0;
636
637 /* get the cix for the lowest valid rix */
638 for (i = 3; i >= 0; i--) {
639 if (rates[i].count && (rates[i].idx >= 0)) {
Felix Fietkau545750d2009-11-23 22:21:01 +0100640 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
Sujithc89424d2009-01-30 14:29:28 +0530641 break;
642 }
643 }
644 cix = rate_table->info[rix].ctrl_rate;
645
646 /* All protection frames are transmited at 2Mb/s for 802.11g,
647 * otherwise we transmit them at 1Mb/s */
648 if (sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ &&
649 !conf_is_ht(&sc->hw->conf))
650 enable_g_protection = 1;
651
652 /*
653 * If 802.11g protection is enabled, determine whether to use RTS/CTS or
654 * just CTS. Note that this is only done for OFDM/HT unicast frames.
655 */
656 if ((sc->sc_flags & SC_OP_PROTECT_ENABLE) &&
Sujithc89424d2009-01-30 14:29:28 +0530657 (rate_table->info[rix].phy == WLAN_RC_PHY_OFDM ||
658 WLAN_RC_PHY_HT(rate_table->info[rix].phy))) {
659 rates[0].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
660 cix = rate_table->info[enable_g_protection].ctrl_rate;
661 }
662
663 tx_info->control.rts_cts_rate_idx = cix;
664}
665
Luis R. Rodrigueze25739a2009-07-14 20:14:09 -0400666static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
667 struct ieee80211_tx_rate_control *txrc)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700668{
Luis R. Rodrigueze25739a2009-07-14 20:14:09 -0400669 struct ath_softc *sc = priv;
670 struct ath_rate_priv *ath_rc_priv = priv_sta;
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400671 const struct ath_rate_table *rate_table;
Sujith39008982009-01-30 14:29:15 +0530672 struct sk_buff *skb = txrc->skb;
673 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
Sujitha8efee42008-11-18 09:07:30 +0530674 struct ieee80211_tx_rate *rates = tx_info->control.rates;
Sujithc89424d2009-01-30 14:29:28 +0530675 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
676 __le16 fc = hdr->frame_control;
Felix Fietkau5c0ba622010-02-19 01:46:36 +0100677 u8 try_per_rate, i = 0, rix;
Sujith39008982009-01-30 14:29:15 +0530678 int is_probe = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700679
Luis R. Rodrigueze25739a2009-07-14 20:14:09 -0400680 if (rate_control_send_low(sta, priv_sta, txrc))
681 return;
682
Luis R. Rodriguezdd190182009-07-14 20:13:56 -0400683 /*
684 * For Multi Rate Retry we use a different number of
685 * retry attempt counts. This ends up looking like this:
686 *
Felix Fietkau65896512010-01-24 03:26:11 +0100687 * MRR[0] = 4
688 * MRR[1] = 4
689 * MRR[2] = 4
690 * MRR[3] = 8
Luis R. Rodriguezdd190182009-07-14 20:13:56 -0400691 *
692 */
Felix Fietkau65896512010-01-24 03:26:11 +0100693 try_per_rate = 4;
Luis R. Rodriguezdd190182009-07-14 20:13:56 -0400694
Sujith40990ec2008-12-07 21:41:37 +0530695 rate_table = sc->cur_rate_table;
Luis R. Rodriguez201c3b42009-07-14 20:14:04 -0400696 rix = ath_rc_get_highest_rix(sc, ath_rc_priv, rate_table, &is_probe);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700697
Luis R. Rodriguezb0a33442010-04-15 17:39:39 -0400698 /*
699 * If we're in HT mode and both us and our peer supports LDPC.
700 * We don't need to check our own device's capabilities as our own
701 * ht capabilities would have already been intersected with our peer's.
702 */
703 if (conf_is_ht(&sc->hw->conf) &&
704 (sta->ht_cap.cap & IEEE80211_HT_CAP_LDPC_CODING))
705 tx_info->flags |= IEEE80211_TX_CTL_LDPC;
706
Felix Fietkau58b51902010-04-19 19:57:37 +0200707 if (conf_is_ht(&sc->hw->conf) &&
708 (sta->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
709 tx_info->flags |= (1 << IEEE80211_TX_CTL_STBC_SHIFT);
710
Sujith39008982009-01-30 14:29:15 +0530711 if (is_probe) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700712 /* set one try for probe rates. For the
713 * probes don't enable rts */
Sujithc89424d2009-01-30 14:29:28 +0530714 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
Felix Fietkau5c0ba622010-02-19 01:46:36 +0100715 1, rix, 0);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700716
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700717 /* Get the next tried/allowed rate. No RTS for the next series
718 * after the probe rate
719 */
Felix Fietkau5c0ba622010-02-19 01:46:36 +0100720 ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
Sujithc89424d2009-01-30 14:29:28 +0530721 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
Felix Fietkau5c0ba622010-02-19 01:46:36 +0100722 try_per_rate, rix, 0);
Vasanthakumar Thiagarajan14587ce2009-03-12 15:32:54 +0530723
724 tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700725 } else {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700726 /* Set the choosen rate. No RTS for first series entry. */
Sujithc89424d2009-01-30 14:29:28 +0530727 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
Felix Fietkau5c0ba622010-02-19 01:46:36 +0100728 try_per_rate, rix, 0);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700729 }
730
731 /* Fill in the other rates for multirate retry */
Sujith39008982009-01-30 14:29:15 +0530732 for ( ; i < 4; i++) {
Luis R. Rodriguezdd190182009-07-14 20:13:56 -0400733 /* Use twice the number of tries for the last MRR segment. */
734 if (i + 1 == 4)
Felix Fietkau65896512010-01-24 03:26:11 +0100735 try_per_rate = 8;
Luis R. Rodriguezdd190182009-07-14 20:13:56 -0400736
Felix Fietkau5c0ba622010-02-19 01:46:36 +0100737 ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700738 /* All other rates in the series have RTS enabled */
Sujithc89424d2009-01-30 14:29:28 +0530739 ath_rc_rate_set_series(rate_table, &rates[i], txrc,
Felix Fietkau5c0ba622010-02-19 01:46:36 +0100740 try_per_rate, rix, 1);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700741 }
742
743 /*
744 * NB:Change rate series to enable aggregation when operating
745 * at lower MCS rates. When first rate in series is MCS2
746 * in HT40 @ 2.4GHz, series should look like:
747 *
748 * {MCS2, MCS1, MCS0, MCS0}.
749 *
750 * When first rate in series is MCS3 in HT20 @ 2.4GHz, series should
751 * look like:
752 *
753 * {MCS3, MCS2, MCS1, MCS1}
754 *
755 * So, set fourth rate in series to be same as third one for
756 * above conditions.
757 */
Sujith3706de62008-12-07 21:42:10 +0530758 if ((sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ) &&
Luis R. Rodriguezecf70442008-12-23 15:58:43 -0800759 (conf_is_ht(&sc->hw->conf))) {
Sujith40990ec2008-12-07 21:41:37 +0530760 u8 dot11rate = rate_table->info[rix].dot11rate;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700761 u8 phy = rate_table->info[rix].phy;
762 if (i == 4 &&
763 ((dot11rate == 2 && phy == WLAN_RC_PHY_HT_40_SS) ||
Sujithdc2222a2008-08-14 13:26:55 +0530764 (dot11rate == 3 && phy == WLAN_RC_PHY_HT_20_SS))) {
Sujitha8efee42008-11-18 09:07:30 +0530765 rates[3].idx = rates[2].idx;
766 rates[3].flags = rates[2].flags;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700767 }
768 }
Sujithc89424d2009-01-30 14:29:28 +0530769
770 /*
771 * Force hardware to use computed duration for next
772 * fragment by disabling multi-rate retry, which
773 * updates duration based on the multi-rate duration table.
774 *
775 * FIXME: Fix duration
776 */
Luis R. Rodriguez7682a762009-07-14 20:14:05 -0400777 if (ieee80211_has_morefrags(fc) ||
778 (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) {
Sujithc89424d2009-01-30 14:29:28 +0530779 rates[1].count = rates[2].count = rates[3].count = 0;
780 rates[1].idx = rates[2].idx = rates[3].idx = 0;
781 rates[0].count = ATH_TXMAXTRY;
782 }
783
784 /* Setup RTS/CTS */
785 ath_rc_rate_set_rtscts(sc, rate_table, tx_info);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700786}
787
Sujith2c5a7442008-11-18 09:08:33 +0530788static bool ath_rc_update_per(struct ath_softc *sc,
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400789 const struct ath_rate_table *rate_table,
Sujith2c5a7442008-11-18 09:08:33 +0530790 struct ath_rate_priv *ath_rc_priv,
Felix Fietkau827e69b2009-11-15 23:09:25 +0100791 struct ieee80211_tx_info *tx_info,
Sujith2c5a7442008-11-18 09:08:33 +0530792 int tx_rate, int xretries, int retries,
793 u32 now_msec)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700794{
Sujith2c5a7442008-11-18 09:08:33 +0530795 bool state_change = false;
Felix Fietkau827e69b2009-11-15 23:09:25 +0100796 int count, n_bad_frames;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700797 u8 last_per;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700798 static u32 nretry_to_per_lookup[10] = {
799 100 * 0 / 1,
800 100 * 1 / 4,
801 100 * 1 / 2,
802 100 * 3 / 4,
803 100 * 4 / 5,
804 100 * 5 / 6,
805 100 * 6 / 7,
806 100 * 7 / 8,
807 100 * 8 / 9,
808 100 * 9 / 10
809 };
810
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400811 last_per = ath_rc_priv->per[tx_rate];
Felix Fietkau827e69b2009-11-15 23:09:25 +0100812 n_bad_frames = tx_info->status.ampdu_len - tx_info->status.ampdu_ack_len;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700813
814 if (xretries) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700815 if (xretries == 1) {
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400816 ath_rc_priv->per[tx_rate] += 30;
817 if (ath_rc_priv->per[tx_rate] > 100)
818 ath_rc_priv->per[tx_rate] = 100;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700819 } else {
820 /* xretries == 2 */
Julia Lawall87c16872008-11-09 17:56:10 +0100821 count = ARRAY_SIZE(nretry_to_per_lookup);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700822 if (retries >= count)
823 retries = count - 1;
Sujith2c5a7442008-11-18 09:08:33 +0530824
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700825 /* new_PER = 7/8*old_PER + 1/8*(currentPER) */
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400826 ath_rc_priv->per[tx_rate] =
Sujith2c5a7442008-11-18 09:08:33 +0530827 (u8)(last_per - (last_per >> 3) + (100 >> 3));
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700828 }
829
830 /* xretries == 1 or 2 */
831
Sujith256b77592008-11-18 09:03:12 +0530832 if (ath_rc_priv->probe_rate == tx_rate)
833 ath_rc_priv->probe_rate = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700834
Sujith2c5a7442008-11-18 09:08:33 +0530835 } else { /* xretries == 0 */
Julia Lawall87c16872008-11-09 17:56:10 +0100836 count = ARRAY_SIZE(nretry_to_per_lookup);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700837 if (retries >= count)
838 retries = count - 1;
Sujith2c5a7442008-11-18 09:08:33 +0530839
Felix Fietkau827e69b2009-11-15 23:09:25 +0100840 if (n_bad_frames) {
Sujithdc2222a2008-08-14 13:26:55 +0530841 /* new_PER = 7/8*old_PER + 1/8*(currentPER)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700842 * Assuming that n_frames is not 0. The current PER
843 * from the retries is 100 * retries / (retries+1),
844 * since the first retries attempts failed, and the
845 * next one worked. For the one that worked,
846 * n_bad_frames subframes out of n_frames wored,
847 * so the PER for that part is
848 * 100 * n_bad_frames / n_frames, and it contributes
849 * 100 * n_bad_frames / (n_frames * (retries+1)) to
850 * the above PER. The expression below is a
851 * simplified version of the sum of these two terms.
852 */
Felix Fietkau827e69b2009-11-15 23:09:25 +0100853 if (tx_info->status.ampdu_len > 0) {
854 int n_frames, n_bad_tries;
Sujith2c5a7442008-11-18 09:08:33 +0530855 u8 cur_per, new_per;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700856
Felix Fietkau827e69b2009-11-15 23:09:25 +0100857 n_bad_tries = retries * tx_info->status.ampdu_len +
858 n_bad_frames;
859 n_frames = tx_info->status.ampdu_len * (retries + 1);
860 cur_per = (100 * n_bad_tries / n_frames) >> 3;
Sujith2c5a7442008-11-18 09:08:33 +0530861 new_per = (u8)(last_per - (last_per >> 3) + cur_per);
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400862 ath_rc_priv->per[tx_rate] = new_per;
Sujith2c5a7442008-11-18 09:08:33 +0530863 }
864 } else {
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400865 ath_rc_priv->per[tx_rate] =
Sujith2c5a7442008-11-18 09:08:33 +0530866 (u8)(last_per - (last_per >> 3) +
867 (nretry_to_per_lookup[retries] >> 3));
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700868 }
869
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700870
871 /*
872 * If we got at most one retry then increase the max rate if
873 * this was a probe. Otherwise, ignore the probe.
874 */
Sujith256b77592008-11-18 09:03:12 +0530875 if (ath_rc_priv->probe_rate && ath_rc_priv->probe_rate == tx_rate) {
Felix Fietkau827e69b2009-11-15 23:09:25 +0100876 if (retries > 0 || 2 * n_bad_frames > tx_info->status.ampdu_len) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700877 /*
878 * Since we probed with just a single attempt,
879 * any retries means the probe failed. Also,
880 * if the attempt worked, but more than half
881 * the subframes were bad then also consider
882 * the probe a failure.
883 */
Sujith256b77592008-11-18 09:03:12 +0530884 ath_rc_priv->probe_rate = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700885 } else {
886 u8 probe_rate = 0;
887
Sujith2c5a7442008-11-18 09:08:33 +0530888 ath_rc_priv->rate_max_phy =
889 ath_rc_priv->probe_rate;
Sujith256b77592008-11-18 09:03:12 +0530890 probe_rate = ath_rc_priv->probe_rate;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700891
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400892 if (ath_rc_priv->per[probe_rate] > 30)
893 ath_rc_priv->per[probe_rate] = 20;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700894
Sujith256b77592008-11-18 09:03:12 +0530895 ath_rc_priv->probe_rate = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700896
897 /*
898 * Since this probe succeeded, we allow the next
899 * probe twice as soon. This allows the maxRate
900 * to move up faster if the probes are
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200901 * successful.
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700902 */
Sujith2c5a7442008-11-18 09:08:33 +0530903 ath_rc_priv->probe_time =
904 now_msec - rate_table->probe_interval / 2;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700905 }
906 }
907
908 if (retries > 0) {
909 /*
910 * Don't update anything. We don't know if
911 * this was because of collisions or poor signal.
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700912 */
Sujith256b77592008-11-18 09:03:12 +0530913 ath_rc_priv->hw_maxretry_pktcnt = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700914 } else {
915 /*
916 * It worked with no retries. First ignore bogus (small)
917 * rssi_ack values.
918 */
Sujith256b77592008-11-18 09:03:12 +0530919 if (tx_rate == ath_rc_priv->rate_max_phy &&
920 ath_rc_priv->hw_maxretry_pktcnt < 255) {
921 ath_rc_priv->hw_maxretry_pktcnt++;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700922 }
923
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700924 }
925 }
Vasanthakumar Thiagarajan39a4caf2009-07-14 20:14:10 -0400926
Sujith2c5a7442008-11-18 09:08:33 +0530927 return state_change;
928}
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700929
Sujith2c5a7442008-11-18 09:08:33 +0530930/* Update PER, RSSI and whatever else that the code thinks it is doing.
931 If you can make sense of all this, you really need to go out more. */
932
933static void ath_rc_update_ht(struct ath_softc *sc,
934 struct ath_rate_priv *ath_rc_priv,
Felix Fietkau827e69b2009-11-15 23:09:25 +0100935 struct ieee80211_tx_info *tx_info,
Sujith2c5a7442008-11-18 09:08:33 +0530936 int tx_rate, int xretries, int retries)
937{
Sujith2c5a7442008-11-18 09:08:33 +0530938 u32 now_msec = jiffies_to_msecs(jiffies);
939 int rate;
940 u8 last_per;
941 bool state_change = false;
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -0400942 const struct ath_rate_table *rate_table = sc->cur_rate_table;
Sujith2c5a7442008-11-18 09:08:33 +0530943 int size = ath_rc_priv->rate_table_size;
944
945 if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
946 return;
947
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400948 last_per = ath_rc_priv->per[tx_rate];
Sujith2c5a7442008-11-18 09:08:33 +0530949
950 /* Update PER first */
951 state_change = ath_rc_update_per(sc, rate_table, ath_rc_priv,
Felix Fietkau827e69b2009-11-15 23:09:25 +0100952 tx_info, tx_rate, xretries,
Sujith2c5a7442008-11-18 09:08:33 +0530953 retries, now_msec);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700954
955 /*
956 * If this rate looks bad (high PER) then stop using it for
957 * a while (except if we are probing).
958 */
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400959 if (ath_rc_priv->per[tx_rate] >= 55 && tx_rate > 0 &&
Sujithdc2222a2008-08-14 13:26:55 +0530960 rate_table->info[tx_rate].ratekbps <=
Sujith256b77592008-11-18 09:03:12 +0530961 rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
Luis R. Rodriguez39448b02009-07-14 20:14:00 -0400962 ath_rc_get_lower_rix(rate_table, ath_rc_priv,
963 (u8)tx_rate, &ath_rc_priv->rate_max_phy);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700964
965 /* Don't probe for a little while. */
Sujith256b77592008-11-18 09:03:12 +0530966 ath_rc_priv->probe_time = now_msec;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700967 }
968
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700969 /* Make sure the rates below this have lower PER */
970 /* Monotonicity is kept only for rates below the current rate. */
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400971 if (ath_rc_priv->per[tx_rate] < last_per) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700972 for (rate = tx_rate - 1; rate >= 0; rate--) {
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700973
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400974 if (ath_rc_priv->per[rate] >
975 ath_rc_priv->per[rate+1]) {
976 ath_rc_priv->per[rate] =
977 ath_rc_priv->per[rate+1];
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700978 }
979 }
980 }
981
982 /* Maintain monotonicity for rates above the current rate */
Sujith2c5a7442008-11-18 09:08:33 +0530983 for (rate = tx_rate; rate < size - 1; rate++) {
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400984 if (ath_rc_priv->per[rate+1] <
985 ath_rc_priv->per[rate])
986 ath_rc_priv->per[rate+1] =
987 ath_rc_priv->per[rate];
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700988 }
989
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700990 /* Every so often, we reduce the thresholds
991 * and PER (different for CCK and OFDM). */
Sujith256b77592008-11-18 09:03:12 +0530992 if (now_msec - ath_rc_priv->per_down_time >=
Vasanthakumar Thiagarajanc4130462009-07-14 20:14:12 -0400993 rate_table->probe_interval) {
Sujith2c5a7442008-11-18 09:08:33 +0530994 for (rate = 0; rate < size; rate++) {
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -0400995 ath_rc_priv->per[rate] =
996 7 * ath_rc_priv->per[rate] / 8;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -0700997 }
998
Sujith256b77592008-11-18 09:03:12 +0530999 ath_rc_priv->per_down_time = now_msec;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001000 }
Sujith2c5a7442008-11-18 09:08:33 +05301001
Sujith9e712792009-02-20 15:13:20 +05301002 ath_debug_stat_retries(sc, tx_rate, xretries, retries,
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -04001003 ath_rc_priv->per[tx_rate]);
Sujith029bc432009-02-04 08:10:26 +05301004
Sujith2c5a7442008-11-18 09:08:33 +05301005}
1006
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -04001007static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
Sujith2c5a7442008-11-18 09:08:33 +05301008 struct ieee80211_tx_rate *rate)
1009{
1010 int rix;
1011
Felix Fietkau545750d2009-11-23 22:21:01 +01001012 if (!(rate->flags & IEEE80211_TX_RC_MCS))
1013 return rate->idx;
1014
1015 rix = rate->idx + rate_table->mcs_start;
Sujith2c5a7442008-11-18 09:08:33 +05301016 if ((rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1017 (rate->flags & IEEE80211_TX_RC_SHORT_GI))
Felix Fietkau545750d2009-11-23 22:21:01 +01001018 rix = rate_table->info[rix].ht_index;
Sujith2c5a7442008-11-18 09:08:33 +05301019 else if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
Felix Fietkau545750d2009-11-23 22:21:01 +01001020 rix = rate_table->info[rix].sgi_index;
Sujith2c5a7442008-11-18 09:08:33 +05301021 else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
Felix Fietkau545750d2009-11-23 22:21:01 +01001022 rix = rate_table->info[rix].cw40index;
Sujith2c5a7442008-11-18 09:08:33 +05301023 else
Felix Fietkau545750d2009-11-23 22:21:01 +01001024 rix = rate_table->info[rix].base_index;
Sujith2c5a7442008-11-18 09:08:33 +05301025
1026 return rix;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001027}
1028
Sujith46d14a52008-11-18 09:08:13 +05301029static void ath_rc_tx_status(struct ath_softc *sc,
1030 struct ath_rate_priv *ath_rc_priv,
1031 struct ieee80211_tx_info *tx_info,
1032 int final_ts_idx, int xretries, int long_retry)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001033{
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -04001034 const struct ath_rate_table *rate_table;
Sujitha8efee42008-11-18 09:07:30 +05301035 struct ieee80211_tx_rate *rates = tx_info->status.rates;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001036 u8 flags;
Sujith2c5a7442008-11-18 09:08:33 +05301037 u32 i = 0, rix;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001038
Sujith40990ec2008-12-07 21:41:37 +05301039 rate_table = sc->cur_rate_table;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001040
1041 /*
1042 * If the first rate is not the final index, there
1043 * are intermediate rate failures to be processed.
1044 */
1045 if (final_ts_idx != 0) {
1046 /* Process intermediate rates that failed.*/
Sujith2c5a7442008-11-18 09:08:33 +05301047 for (i = 0; i < final_ts_idx ; i++) {
1048 if (rates[i].count != 0 && (rates[i].idx >= 0)) {
1049 flags = rates[i].flags;
1050
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001051 /* If HT40 and we have switched mode from
1052 * 40 to 20 => don't update */
Sujith2c5a7442008-11-18 09:08:33 +05301053
Sujitha8efee42008-11-18 09:07:30 +05301054 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
Sujithf5c38ef2009-03-30 15:28:57 +05301055 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001056 return;
Sujithe63835b2008-11-18 09:07:53 +05301057
Sujith2c5a7442008-11-18 09:08:33 +05301058 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
Felix Fietkau827e69b2009-11-15 23:09:25 +01001059 ath_rc_update_ht(sc, ath_rc_priv, tx_info,
1060 rix, xretries ? 1 : 2,
Sujith2c5a7442008-11-18 09:08:33 +05301061 rates[i].count);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001062 }
1063 }
1064 } else {
1065 /*
1066 * Handle the special case of MIMO PS burst, where the second
1067 * aggregate is sent out with only one rate and one try.
1068 * Treating it as an excessive retry penalizes the rate
1069 * inordinately.
1070 */
Sujitha8efee42008-11-18 09:07:30 +05301071 if (rates[0].count == 1 && xretries == 1)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001072 xretries = 2;
1073 }
1074
Sujith2c5a7442008-11-18 09:08:33 +05301075 flags = rates[i].flags;
1076
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001077 /* If HT40 and we have switched mode from 40 to 20 => don't update */
Sujitha8efee42008-11-18 09:07:30 +05301078 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
Sujithf5c38ef2009-03-30 15:28:57 +05301079 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001080 return;
1081
Sujith2c5a7442008-11-18 09:08:33 +05301082 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
Felix Fietkau827e69b2009-11-15 23:09:25 +01001083 ath_rc_update_ht(sc, ath_rc_priv, tx_info, rix, xretries, long_retry);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001084}
1085
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -04001086static const
1087struct ath_rate_table *ath_choose_rate_table(struct ath_softc *sc,
1088 enum ieee80211_band band,
1089 bool is_ht,
1090 bool is_cw_40)
Sujithe11602b2008-11-27 09:46:27 +05301091{
1092 int mode = 0;
Luis R. Rodriguezc46917b2009-09-13 02:42:02 -07001093 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
Sujithe11602b2008-11-27 09:46:27 +05301094
1095 switch(band) {
1096 case IEEE80211_BAND_2GHZ:
1097 mode = ATH9K_MODE_11G;
1098 if (is_ht)
1099 mode = ATH9K_MODE_11NG_HT20;
1100 if (is_cw_40)
1101 mode = ATH9K_MODE_11NG_HT40PLUS;
1102 break;
1103 case IEEE80211_BAND_5GHZ:
1104 mode = ATH9K_MODE_11A;
1105 if (is_ht)
1106 mode = ATH9K_MODE_11NA_HT20;
1107 if (is_cw_40)
1108 mode = ATH9K_MODE_11NA_HT40PLUS;
1109 break;
1110 default:
Luis R. Rodriguezc46917b2009-09-13 02:42:02 -07001111 ath_print(common, ATH_DBG_CONFIG, "Invalid band\n");
Sujithe11602b2008-11-27 09:46:27 +05301112 return NULL;
1113 }
1114
1115 BUG_ON(mode >= ATH9K_MODE_MAX);
1116
Luis R. Rodriguezc46917b2009-09-13 02:42:02 -07001117 ath_print(common, ATH_DBG_CONFIG,
1118 "Choosing rate table for mode: %d\n", mode);
Felix Fietkau545750d2009-11-23 22:21:01 +01001119
1120 sc->cur_rate_mode = mode;
1121 return hw_rate_table[mode];
Sujithe11602b2008-11-27 09:46:27 +05301122}
1123
Sujith5ddfac32008-11-18 09:06:44 +05301124static void ath_rc_init(struct ath_softc *sc,
Sujith46d14a52008-11-18 09:08:13 +05301125 struct ath_rate_priv *ath_rc_priv,
Sujith5ddfac32008-11-18 09:06:44 +05301126 struct ieee80211_supported_band *sband,
Sujith9331ec82009-03-02 13:29:45 +05301127 struct ieee80211_sta *sta,
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -04001128 const struct ath_rate_table *rate_table)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001129{
Sujith5ddfac32008-11-18 09:06:44 +05301130 struct ath_rateset *rateset = &ath_rc_priv->neg_rates;
Luis R. Rodriguezc46917b2009-09-13 02:42:02 -07001131 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
Sujith5ddfac32008-11-18 09:06:44 +05301132 u8 *ht_mcs = (u8 *)&ath_rc_priv->neg_ht_rates;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001133 u8 i, j, k, hi = 0, hthi = 0;
Sujithe11602b2008-11-27 09:46:27 +05301134
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001135 /* Initial rate table size. Will change depending
1136 * on the working rate set */
Sujith46d14a52008-11-18 09:08:13 +05301137 ath_rc_priv->rate_table_size = RATE_TABLE_SIZE;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001138
1139 /* Initialize thresholds according to the global rate table */
Sujith5ddfac32008-11-18 09:06:44 +05301140 for (i = 0 ; i < ath_rc_priv->rate_table_size; i++) {
Vasanthakumar Thiagarajan922bac62009-07-14 20:14:13 -04001141 ath_rc_priv->per[i] = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001142 }
1143
1144 /* Determine the valid rates */
Sujith256b77592008-11-18 09:03:12 +05301145 ath_rc_init_valid_txmask(ath_rc_priv);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001146
1147 for (i = 0; i < WLAN_RC_PHY_MAX; i++) {
1148 for (j = 0; j < MAX_TX_RATE_PHY; j++)
Sujith256b77592008-11-18 09:03:12 +05301149 ath_rc_priv->valid_phy_rateidx[i][j] = 0;
1150 ath_rc_priv->valid_phy_ratecnt[i] = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001151 }
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001152
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001153 if (!rateset->rs_nrates) {
1154 /* No working rate, just initialize valid rates */
Sujith2c5a7442008-11-18 09:08:33 +05301155 hi = ath_rc_init_validrates(ath_rc_priv, rate_table,
Sujithc89424d2009-01-30 14:29:28 +05301156 ath_rc_priv->ht_cap);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001157 } else {
1158 /* Use intersection of working rates and valid rates */
Sujith2c5a7442008-11-18 09:08:33 +05301159 hi = ath_rc_setvalid_rates(ath_rc_priv, rate_table,
Sujithc89424d2009-01-30 14:29:28 +05301160 rateset, ath_rc_priv->ht_cap);
Sujith5ddfac32008-11-18 09:06:44 +05301161 if (ath_rc_priv->ht_cap & WLAN_RC_HT_FLAG) {
Sujith2c5a7442008-11-18 09:08:33 +05301162 hthi = ath_rc_setvalid_htrates(ath_rc_priv,
Sujithc89424d2009-01-30 14:29:28 +05301163 rate_table,
1164 ht_mcs,
1165 ath_rc_priv->ht_cap);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001166 }
1167 hi = A_MAX(hi, hthi);
1168 }
1169
Sujith256b77592008-11-18 09:03:12 +05301170 ath_rc_priv->rate_table_size = hi + 1;
1171 ath_rc_priv->rate_max_phy = 0;
Luis R. Rodriguez9680e8a2009-09-13 23:28:00 -07001172 BUG_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001173
1174 for (i = 0, k = 0; i < WLAN_RC_PHY_MAX; i++) {
Sujith256b77592008-11-18 09:03:12 +05301175 for (j = 0; j < ath_rc_priv->valid_phy_ratecnt[i]; j++) {
1176 ath_rc_priv->valid_rate_index[k++] =
1177 ath_rc_priv->valid_phy_rateidx[i][j];
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001178 }
1179
Sujith46d14a52008-11-18 09:08:13 +05301180 if (!ath_rc_valid_phyrate(i, rate_table->initial_ratemax, 1)
Sujith256b77592008-11-18 09:03:12 +05301181 || !ath_rc_priv->valid_phy_ratecnt[i])
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001182 continue;
1183
Sujith256b77592008-11-18 09:03:12 +05301184 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_phy_rateidx[i][j-1];
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001185 }
Luis R. Rodriguez9680e8a2009-09-13 23:28:00 -07001186 BUG_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);
1187 BUG_ON(k > RATE_TABLE_SIZE);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001188
Sujith256b77592008-11-18 09:03:12 +05301189 ath_rc_priv->max_valid_rate = k;
Sujith256b77592008-11-18 09:03:12 +05301190 ath_rc_sort_validrates(rate_table, ath_rc_priv);
1191 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
Sujith40990ec2008-12-07 21:41:37 +05301192 sc->cur_rate_table = rate_table;
Sujith9331ec82009-03-02 13:29:45 +05301193
Luis R. Rodriguezc46917b2009-09-13 02:42:02 -07001194 ath_print(common, ATH_DBG_CONFIG,
1195 "RC Initialized with capabilities: 0x%x\n",
1196 ath_rc_priv->ht_cap);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001197}
1198
Sujithc2da50e2009-03-13 08:56:11 +05301199static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta,
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001200 bool is_cw40, bool is_sgi)
Sujith9331ec82009-03-02 13:29:45 +05301201{
1202 u8 caps = 0;
1203
Sujithc2da50e2009-03-13 08:56:11 +05301204 if (sta->ht_cap.ht_supported) {
Sujith9331ec82009-03-02 13:29:45 +05301205 caps = WLAN_RC_HT_FLAG;
Felix Fietkau35537272010-06-12 17:22:33 +02001206 if (sta->ht_cap.mcs.rx_mask[1])
1207 caps |= WLAN_RC_DS_FLAG;
Sujith9331ec82009-03-02 13:29:45 +05301208 if (is_cw40)
1209 caps |= WLAN_RC_40_FLAG;
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001210 if (is_sgi)
Sujith9331ec82009-03-02 13:29:45 +05301211 caps |= WLAN_RC_SGI_FLAG;
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001212
Sujith9331ec82009-03-02 13:29:45 +05301213 }
1214
1215 return caps;
1216}
1217
1218/***********************************/
1219/* mac80211 Rate Control callbacks */
1220/***********************************/
1221
Johannes Berg4b7679a2008-09-18 18:14:18 +02001222static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
1223 struct ieee80211_sta *sta, void *priv_sta,
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001224 struct sk_buff *skb)
1225{
1226 struct ath_softc *sc = priv;
Sujith46d14a52008-11-18 09:08:13 +05301227 struct ath_rate_priv *ath_rc_priv = priv_sta;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001228 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1229 struct ieee80211_hdr *hdr;
Felix Fietkau827e69b2009-11-15 23:09:25 +01001230 int final_ts_idx = 0, tx_status = 0, is_underrun = 0;
1231 int long_retry = 0;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001232 __le16 fc;
Felix Fietkau827e69b2009-11-15 23:09:25 +01001233 int i;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001234
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001235 hdr = (struct ieee80211_hdr *)skb->data;
1236 fc = hdr->frame_control;
Felix Fietkau827e69b2009-11-15 23:09:25 +01001237 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
1238 struct ieee80211_tx_rate *rate = &tx_info->status.rates[i];
1239 if (!rate->count)
1240 break;
1241
1242 final_ts_idx = i;
1243 long_retry = rate->count - 1;
1244 }
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001245
Felix Fietkaud9698472010-03-01 13:32:11 +01001246 if (!priv_sta || !ieee80211_is_data(fc))
1247 return;
1248
1249 /* This packet was aggregated but doesn't carry status info */
1250 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) &&
1251 !(tx_info->flags & IEEE80211_TX_STAT_AMPDU))
Felix Fietkau827e69b2009-11-15 23:09:25 +01001252 return;
Johannes Berge6a98542008-10-21 12:40:02 +02001253
Felix Fietkau827e69b2009-11-15 23:09:25 +01001254 if (tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED)
1255 return;
Johannes Berge6a98542008-10-21 12:40:02 +02001256
Sujith46d14a52008-11-18 09:08:13 +05301257 /*
Luis R. Rodriguezf4709fd2009-11-24 21:37:57 -05001258 * If an underrun error is seen assume it as an excessive retry only
1259 * if max frame trigger level has been reached (2 KB for singel stream,
1260 * and 4 KB for dual stream). Adjust the long retry as if the frame was
1261 * tried hw->max_rate_tries times to affect how ratectrl updates PER for
1262 * the failed rate. In case of congestion on the bus penalizing these
1263 * type of underruns should help hardware actually transmit new frames
1264 * successfully by eventually preferring slower rates. This itself
1265 * should also alleviate congestion on the bus.
Sujith46d14a52008-11-18 09:08:13 +05301266 */
Felix Fietkau827e69b2009-11-15 23:09:25 +01001267 if ((tx_info->pad[0] & ATH_TX_INFO_UNDERRUN) &&
1268 (sc->sc_ah->tx_trig_level >= ath_rc_priv->tx_triglevel_max)) {
Sujith46d14a52008-11-18 09:08:13 +05301269 tx_status = 1;
1270 is_underrun = 1;
1271 }
1272
Felix Fietkau827e69b2009-11-15 23:09:25 +01001273 if (tx_info->pad[0] & ATH_TX_INFO_XRETRY)
Sujith46d14a52008-11-18 09:08:13 +05301274 tx_status = 1;
1275
1276 ath_rc_tx_status(sc, ath_rc_priv, tx_info, final_ts_idx, tx_status,
Felix Fietkau827e69b2009-11-15 23:09:25 +01001277 (is_underrun) ? sc->hw->max_rate_tries : long_retry);
Sujith46d14a52008-11-18 09:08:13 +05301278
Sujithd22b0022009-01-28 11:55:45 +05301279 /* Check if aggregation has to be enabled for this tid */
Vasanthakumar Thiagarajand5c232f2009-02-18 10:22:02 +05301280 if (conf_is_ht(&sc->hw->conf) &&
1281 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
Sujithd22b0022009-01-28 11:55:45 +05301282 if (ieee80211_is_data_qos(fc)) {
1283 u8 *qc, tid;
1284 struct ath_node *an;
1285
1286 qc = ieee80211_get_qos_ctl(hdr);
1287 tid = qc[0] & 0xf;
1288 an = (struct ath_node *)sta->drv_priv;
1289
1290 if(ath_tx_aggr_check(sc, an, tid))
Johannes Bergc951ad32009-11-16 12:00:38 +01001291 ieee80211_start_tx_ba_session(sta, tid);
Sujithd22b0022009-01-28 11:55:45 +05301292 }
1293 }
Sujith7a7dec62009-01-30 14:32:09 +05301294
Felix Fietkau545750d2009-11-23 22:21:01 +01001295 ath_debug_stat_rc(sc, ath_rc_get_rateindex(sc->cur_rate_table,
1296 &tx_info->status.rates[final_ts_idx]));
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001297}
1298
Johannes Berg4b7679a2008-09-18 18:14:18 +02001299static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
1300 struct ieee80211_sta *sta, void *priv_sta)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001301{
Johannes Berg4b7679a2008-09-18 18:14:18 +02001302 struct ath_softc *sc = priv;
Sujith46d14a52008-11-18 09:08:13 +05301303 struct ath_rate_priv *ath_rc_priv = priv_sta;
Felix Fietkau545750d2009-11-23 22:21:01 +01001304 const struct ath_rate_table *rate_table;
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001305 bool is_cw40, is_sgi = false;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001306 int i, j = 0;
1307
Sujith7b4d2732008-11-18 09:04:00 +05301308 for (i = 0; i < sband->n_bitrates; i++) {
1309 if (sta->supp_rates[sband->band] & BIT(i)) {
1310 ath_rc_priv->neg_rates.rs_rates[j]
1311 = (sband->bitrates[i].bitrate * 2) / 10;
1312 j++;
1313 }
1314 }
1315 ath_rc_priv->neg_rates.rs_nrates = j;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001316
Sujitha4510bf2008-10-23 12:15:19 +05301317 if (sta->ht_cap.ht_supported) {
Sujith7b4d2732008-11-18 09:04:00 +05301318 for (i = 0, j = 0; i < 77; i++) {
Johannes Bergae5eb022008-10-14 16:58:37 +02001319 if (sta->ht_cap.mcs.rx_mask[i/8] & (1<<(i%8)))
Sujithdc2222a2008-08-14 13:26:55 +05301320 ath_rc_priv->neg_ht_rates.rs_rates[j++] = i;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001321 if (j == ATH_RATE_MAX)
1322 break;
1323 }
Sujithdc2222a2008-08-14 13:26:55 +05301324 ath_rc_priv->neg_ht_rates.rs_nrates = j;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001325 }
Sujith7b4d2732008-11-18 09:04:00 +05301326
Sujith9331ec82009-03-02 13:29:45 +05301327 is_cw40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001328
1329 if (is_cw40)
1330 is_sgi = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
1331 else if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_SGI_20)
1332 is_sgi = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
Sujith9331ec82009-03-02 13:29:45 +05301333
1334 /* Choose rate table first */
1335
1336 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) ||
Pat Erley9cb54122009-03-20 22:59:59 -04001337 (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) ||
Sujith9331ec82009-03-02 13:29:45 +05301338 (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC)) {
1339 rate_table = ath_choose_rate_table(sc, sband->band,
Felix Fietkau545750d2009-11-23 22:21:01 +01001340 sta->ht_cap.ht_supported, is_cw40);
1341 } else {
1342 rate_table = hw_rate_table[sc->cur_rate_mode];
Sujith9331ec82009-03-02 13:29:45 +05301343 }
1344
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001345 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta, is_cw40, is_sgi);
Sujith9331ec82009-03-02 13:29:45 +05301346 ath_rc_init(sc, priv_sta, sband, sta, rate_table);
1347}
1348
1349static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
1350 struct ieee80211_sta *sta, void *priv_sta,
Sujith4fa00432010-03-01 14:42:57 +05301351 u32 changed, enum nl80211_channel_type oper_chan_type)
Sujith9331ec82009-03-02 13:29:45 +05301352{
1353 struct ath_softc *sc = priv;
1354 struct ath_rate_priv *ath_rc_priv = priv_sta;
Luis R. Rodriguez4f0fc7c2009-05-06 02:20:00 -04001355 const struct ath_rate_table *rate_table = NULL;
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001356 bool oper_cw40 = false, oper_sgi;
Sujith9331ec82009-03-02 13:29:45 +05301357 bool local_cw40 = (ath_rc_priv->ht_cap & WLAN_RC_40_FLAG) ?
1358 true : false;
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001359 bool local_sgi = (ath_rc_priv->ht_cap & WLAN_RC_SGI_FLAG) ?
Sujith9331ec82009-03-02 13:29:45 +05301360 true : false;
1361
1362 /* FIXME: Handle AP mode later when we support CWM */
1363
1364 if (changed & IEEE80211_RC_HT_CHANGED) {
1365 if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
1366 return;
1367
Sujith4fa00432010-03-01 14:42:57 +05301368 if (oper_chan_type == NL80211_CHAN_HT40MINUS ||
1369 oper_chan_type == NL80211_CHAN_HT40PLUS)
Sujith9331ec82009-03-02 13:29:45 +05301370 oper_cw40 = true;
1371
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001372 if (oper_cw40)
1373 oper_sgi = (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40) ?
1374 true : false;
1375 else if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_SGI_20)
1376 oper_sgi = (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20) ?
1377 true : false;
1378 else
1379 oper_sgi = false;
Sujith9331ec82009-03-02 13:29:45 +05301380
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001381 if ((local_cw40 != oper_cw40) || (local_sgi != oper_sgi)) {
Sujith9331ec82009-03-02 13:29:45 +05301382 rate_table = ath_choose_rate_table(sc, sband->band,
1383 sta->ht_cap.ht_supported,
1384 oper_cw40);
Sujithc2da50e2009-03-13 08:56:11 +05301385 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta,
Vasanthakumar Thiagarajan6473d242010-05-13 18:42:38 -07001386 oper_cw40, oper_sgi);
Sujith9331ec82009-03-02 13:29:45 +05301387 ath_rc_init(sc, priv_sta, sband, sta, rate_table);
1388
Luis R. Rodriguezc46917b2009-09-13 02:42:02 -07001389 ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_CONFIG,
1390 "Operating HT Bandwidth changed to: %d\n",
1391 sc->hw->conf.channel_type);
Felix Fietkau545750d2009-11-23 22:21:01 +01001392 sc->cur_rate_table = hw_rate_table[sc->cur_rate_mode];
Sujith9331ec82009-03-02 13:29:45 +05301393 }
1394 }
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001395}
1396
Johannes Berg4b7679a2008-09-18 18:14:18 +02001397static void *ath_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001398{
Jouni Malinenbce048d2009-03-03 19:23:28 +02001399 struct ath_wiphy *aphy = hw->priv;
1400 return aphy->sc;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001401}
1402
1403static void ath_rate_free(void *priv)
1404{
1405 return;
1406}
1407
Johannes Berg4b7679a2008-09-18 18:14:18 +02001408static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001409{
1410 struct ath_softc *sc = priv;
Sujith46d14a52008-11-18 09:08:13 +05301411 struct ath_rate_priv *rate_priv;
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001412
Sujith46d14a52008-11-18 09:08:13 +05301413 rate_priv = kzalloc(sizeof(struct ath_rate_priv), gfp);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001414 if (!rate_priv) {
Luis R. Rodriguezc46917b2009-09-13 02:42:02 -07001415 ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
1416 "Unable to allocate private rc structure\n");
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001417 return NULL;
1418 }
Sujithfe605942008-11-18 09:03:36 +05301419
Sujith2660b812009-02-09 13:27:26 +05301420 rate_priv->tx_triglevel_max = sc->sc_ah->caps.tx_triglevel_max;
Sujithdc2222a2008-08-14 13:26:55 +05301421
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001422 return rate_priv;
1423}
1424
Johannes Berg4b7679a2008-09-18 18:14:18 +02001425static void ath_rate_free_sta(void *priv, struct ieee80211_sta *sta,
1426 void *priv_sta)
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001427{
Sujith46d14a52008-11-18 09:08:13 +05301428 struct ath_rate_priv *rate_priv = priv_sta;
Sujithfe605942008-11-18 09:03:36 +05301429 kfree(rate_priv);
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001430}
1431
1432static struct rate_control_ops ath_rate_ops = {
1433 .module = NULL,
1434 .name = "ath9k_rate_control",
1435 .tx_status = ath_tx_status,
1436 .get_rate = ath_get_rate,
1437 .rate_init = ath_rate_init,
Sujith9331ec82009-03-02 13:29:45 +05301438 .rate_update = ath_rate_update,
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001439 .alloc = ath_rate_alloc,
1440 .free = ath_rate_free,
1441 .alloc_sta = ath_rate_alloc_sta,
Johannes Berg4b7679a2008-09-18 18:14:18 +02001442 .free_sta = ath_rate_free_sta,
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001443};
1444
Luis R. Rodriguezf078f202008-08-04 00:16:41 -07001445int ath_rate_control_register(void)
1446{
1447 return ieee80211_rate_control_register(&ath_rate_ops);
1448}
1449
1450void ath_rate_control_unregister(void)
1451{
1452 ieee80211_rate_control_unregister(&ath_rate_ops);
1453}