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ath9k: Change rateset calculation
[mirror_ubuntu-artful-kernel.git] / drivers / net / wireless / ath / ath9k / rc.c
1 /*
2 * Copyright (c) 2004 Video54 Technologies, Inc.
3 * Copyright (c) 2004-2011 Atheros Communications, Inc.
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
18 #include <linux/slab.h>
19 #include <linux/export.h>
20
21 #include "ath9k.h"
22
23 static const struct ath_rate_table ar5416_11na_ratetable = {
24 68,
25 8, /* MCS start */
26 {
27 [0] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 6000,
28 5400, 0, 12, 0, 0, 0, 0 }, /* 6 Mb */
29 [1] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 9000,
30 7800, 1, 18, 0, 1, 1, 1 }, /* 9 Mb */
31 [2] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 12000,
32 10000, 2, 24, 2, 2, 2, 2 }, /* 12 Mb */
33 [3] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 18000,
34 13900, 3, 36, 2, 3, 3, 3 }, /* 18 Mb */
35 [4] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 24000,
36 17300, 4, 48, 4, 4, 4, 4 }, /* 24 Mb */
37 [5] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 36000,
38 23000, 5, 72, 4, 5, 5, 5 }, /* 36 Mb */
39 [6] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 48000,
40 27400, 6, 96, 4, 6, 6, 6 }, /* 48 Mb */
41 [7] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 54000,
42 29300, 7, 108, 4, 7, 7, 7 }, /* 54 Mb */
43 [8] = { RC_HT_SDT_2040, WLAN_RC_PHY_HT_20_SS, 6500,
44 6400, 0, 0, 0, 38, 8, 38 }, /* 6.5 Mb */
45 [9] = { RC_HT_SDT_20, WLAN_RC_PHY_HT_20_SS, 13000,
46 12700, 1, 1, 2, 39, 9, 39 }, /* 13 Mb */
47 [10] = { RC_HT_SDT_20, WLAN_RC_PHY_HT_20_SS, 19500,
48 18800, 2, 2, 2, 40, 10, 40 }, /* 19.5 Mb */
49 [11] = { RC_HT_SD_20, WLAN_RC_PHY_HT_20_SS, 26000,
50 25000, 3, 3, 4, 41, 11, 41 }, /* 26 Mb */
51 [12] = { RC_HT_SD_20, WLAN_RC_PHY_HT_20_SS, 39000,
52 36700, 4, 4, 4, 42, 12, 42 }, /* 39 Mb */
53 [13] = { RC_HT_S_20, WLAN_RC_PHY_HT_20_SS, 52000,
54 48100, 5, 5, 4, 43, 13, 43 }, /* 52 Mb */
55 [14] = { RC_HT_S_20, WLAN_RC_PHY_HT_20_SS, 58500,
56 53500, 6, 6, 4, 44, 14, 44 }, /* 58.5 Mb */
57 [15] = { RC_HT_S_20, WLAN_RC_PHY_HT_20_SS, 65000,
58 59000, 7, 7, 4, 45, 16, 46 }, /* 65 Mb */
59 [16] = { RC_HT_S_20, WLAN_RC_PHY_HT_20_SS_HGI, 72200,
60 65400, 7, 7, 4, 45, 16, 46 }, /* 75 Mb */
61 [17] = { RC_INVALID, WLAN_RC_PHY_HT_20_DS, 13000,
62 12700, 8, 8, 0, 47, 17, 47 }, /* 13 Mb */
63 [18] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_DS, 26000,
64 24800, 9, 9, 2, 48, 18, 48 }, /* 26 Mb */
65 [19] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_DS, 39000,
66 36600, 10, 10, 2, 49, 19, 49 }, /* 39 Mb */
67 [20] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 52000,
68 48100, 11, 11, 4, 50, 20, 50 }, /* 52 Mb */
69 [21] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 78000,
70 69500, 12, 12, 4, 51, 21, 51 }, /* 78 Mb */
71 [22] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 104000,
72 89500, 13, 13, 4, 52, 22, 52 }, /* 104 Mb */
73 [23] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 117000,
74 98900, 14, 14, 4, 53, 23, 53 }, /* 117 Mb */
75 [24] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 130000,
76 108300, 15, 15, 4, 54, 25, 55 }, /* 130 Mb */
77 [25] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS_HGI, 144400,
78 120000, 15, 15, 4, 54, 25, 55 }, /* 144.4 Mb */
79 [26] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 19500,
80 17400, 16, 16, 0, 56, 26, 56 }, /* 19.5 Mb */
81 [27] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 39000,
82 35100, 17, 17, 2, 57, 27, 57 }, /* 39 Mb */
83 [28] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 58500,
84 52600, 18, 18, 2, 58, 28, 58 }, /* 58.5 Mb */
85 [29] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 78000,
86 70400, 19, 19, 4, 59, 29, 59 }, /* 78 Mb */
87 [30] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 117000,
88 104900, 20, 20, 4, 60, 31, 61 }, /* 117 Mb */
89 [31] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS_HGI, 130000,
90 115800, 20, 20, 4, 60, 31, 61 }, /* 130 Mb*/
91 [32] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS, 156000,
92 137200, 21, 21, 4, 62, 33, 63 }, /* 156 Mb */
93 [33] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS_HGI, 173300,
94 151100, 21, 21, 4, 62, 33, 63 }, /* 173.3 Mb */
95 [34] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS, 175500,
96 152800, 22, 22, 4, 64, 35, 65 }, /* 175.5 Mb */
97 [35] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS_HGI, 195000,
98 168400, 22, 22, 4, 64, 35, 65 }, /* 195 Mb*/
99 [36] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS, 195000,
100 168400, 23, 23, 4, 66, 37, 67 }, /* 195 Mb */
101 [37] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS_HGI, 216700,
102 185000, 23, 23, 4, 66, 37, 67 }, /* 216.7 Mb */
103 [38] = { RC_HT_SDT_40, WLAN_RC_PHY_HT_40_SS, 13500,
104 13200, 0, 0, 0, 38, 38, 38 }, /* 13.5 Mb*/
105 [39] = { RC_HT_SDT_40, WLAN_RC_PHY_HT_40_SS, 27500,
106 25900, 1, 1, 2, 39, 39, 39 }, /* 27.0 Mb*/
107 [40] = { RC_HT_SDT_40, WLAN_RC_PHY_HT_40_SS, 40500,
108 38600, 2, 2, 2, 40, 40, 40 }, /* 40.5 Mb*/
109 [41] = { RC_HT_SD_40, WLAN_RC_PHY_HT_40_SS, 54000,
110 49800, 3, 3, 4, 41, 41, 41 }, /* 54 Mb */
111 [42] = { RC_HT_SD_40, WLAN_RC_PHY_HT_40_SS, 81500,
112 72200, 4, 4, 4, 42, 42, 42 }, /* 81 Mb */
113 [43] = { RC_HT_S_40, WLAN_RC_PHY_HT_40_SS, 108000,
114 92900, 5, 5, 4, 43, 43, 43 }, /* 108 Mb */
115 [44] = { RC_HT_S_40, WLAN_RC_PHY_HT_40_SS, 121500,
116 102700, 6, 6, 4, 44, 44, 44 }, /* 121.5 Mb*/
117 [45] = { RC_HT_S_40, WLAN_RC_PHY_HT_40_SS, 135000,
118 112000, 7, 7, 4, 45, 46, 46 }, /* 135 Mb */
119 [46] = { RC_HT_S_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000,
120 122000, 7, 7, 4, 45, 46, 46 }, /* 150 Mb */
121 [47] = { RC_INVALID, WLAN_RC_PHY_HT_40_DS, 27000,
122 25800, 8, 8, 0, 47, 47, 47 }, /* 27 Mb */
123 [48] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_DS, 54000,
124 49800, 9, 9, 2, 48, 48, 48 }, /* 54 Mb */
125 [49] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_DS, 81000,
126 71900, 10, 10, 2, 49, 49, 49 }, /* 81 Mb */
127 [50] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 108000,
128 92500, 11, 11, 4, 50, 50, 50 }, /* 108 Mb */
129 [51] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 162000,
130 130300, 12, 12, 4, 51, 51, 51 }, /* 162 Mb */
131 [52] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 216000,
132 162800, 13, 13, 4, 52, 52, 52 }, /* 216 Mb */
133 [53] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 243000,
134 178200, 14, 14, 4, 53, 53, 53 }, /* 243 Mb */
135 [54] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 270000,
136 192100, 15, 15, 4, 54, 55, 55 }, /* 270 Mb */
137 [55] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS_HGI, 300000,
138 207000, 15, 15, 4, 54, 55, 55 }, /* 300 Mb */
139 [56] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 40500,
140 36100, 16, 16, 0, 56, 56, 56 }, /* 40.5 Mb */
141 [57] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 81000,
142 72900, 17, 17, 2, 57, 57, 57 }, /* 81 Mb */
143 [58] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 121500,
144 108300, 18, 18, 2, 58, 58, 58 }, /* 121.5 Mb */
145 [59] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 162000,
146 142000, 19, 19, 4, 59, 59, 59 }, /* 162 Mb */
147 [60] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 243000,
148 205100, 20, 20, 4, 60, 61, 61 }, /* 243 Mb */
149 [61] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS_HGI, 270000,
150 224700, 20, 20, 4, 60, 61, 61 }, /* 270 Mb */
151 [62] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS, 324000,
152 263100, 21, 21, 4, 62, 63, 63 }, /* 324 Mb */
153 [63] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS_HGI, 360000,
154 288000, 21, 21, 4, 62, 63, 63 }, /* 360 Mb */
155 [64] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS, 364500,
156 290700, 22, 22, 4, 64, 65, 65 }, /* 364.5 Mb */
157 [65] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS_HGI, 405000,
158 317200, 22, 22, 4, 64, 65, 65 }, /* 405 Mb */
159 [66] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS, 405000,
160 317200, 23, 23, 4, 66, 67, 67 }, /* 405 Mb */
161 [67] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS_HGI, 450000,
162 346400, 23, 23, 4, 66, 67, 67 }, /* 450 Mb */
163 },
164 50, /* probe interval */
165 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
166 };
167
168 /* 4ms frame limit not used for NG mode. The values filled
169 * for HT are the 64K max aggregate limit */
170
171 static const struct ath_rate_table ar5416_11ng_ratetable = {
172 72,
173 12, /* MCS start */
174 {
175 [0] = { RC_ALL, WLAN_RC_PHY_CCK, 1000,
176 900, 0, 2, 0, 0, 0, 0 }, /* 1 Mb */
177 [1] = { RC_ALL, WLAN_RC_PHY_CCK, 2000,
178 1900, 1, 4, 1, 1, 1, 1 }, /* 2 Mb */
179 [2] = { RC_ALL, WLAN_RC_PHY_CCK, 5500,
180 4900, 2, 11, 2, 2, 2, 2 }, /* 5.5 Mb */
181 [3] = { RC_ALL, WLAN_RC_PHY_CCK, 11000,
182 8100, 3, 22, 3, 3, 3, 3 }, /* 11 Mb */
183 [4] = { RC_INVALID, WLAN_RC_PHY_OFDM, 6000,
184 5400, 4, 12, 4, 4, 4, 4 }, /* 6 Mb */
185 [5] = { RC_INVALID, WLAN_RC_PHY_OFDM, 9000,
186 7800, 5, 18, 4, 5, 5, 5 }, /* 9 Mb */
187 [6] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 12000,
188 10100, 6, 24, 6, 6, 6, 6 }, /* 12 Mb */
189 [7] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 18000,
190 14100, 7, 36, 6, 7, 7, 7 }, /* 18 Mb */
191 [8] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 24000,
192 17700, 8, 48, 8, 8, 8, 8 }, /* 24 Mb */
193 [9] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 36000,
194 23700, 9, 72, 8, 9, 9, 9 }, /* 36 Mb */
195 [10] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 48000,
196 27400, 10, 96, 8, 10, 10, 10 }, /* 48 Mb */
197 [11] = { RC_L_SDT, WLAN_RC_PHY_OFDM, 54000,
198 30900, 11, 108, 8, 11, 11, 11 }, /* 54 Mb */
199 [12] = { RC_INVALID, WLAN_RC_PHY_HT_20_SS, 6500,
200 6400, 0, 0, 4, 42, 12, 42 }, /* 6.5 Mb */
201 [13] = { RC_HT_SDT_20, WLAN_RC_PHY_HT_20_SS, 13000,
202 12700, 1, 1, 6, 43, 13, 43 }, /* 13 Mb */
203 [14] = { RC_HT_SDT_20, WLAN_RC_PHY_HT_20_SS, 19500,
204 18800, 2, 2, 6, 44, 14, 44 }, /* 19.5 Mb*/
205 [15] = { RC_HT_SD_20, WLAN_RC_PHY_HT_20_SS, 26000,
206 25000, 3, 3, 8, 45, 15, 45 }, /* 26 Mb */
207 [16] = { RC_HT_SD_20, WLAN_RC_PHY_HT_20_SS, 39000,
208 36700, 4, 4, 8, 46, 16, 46 }, /* 39 Mb */
209 [17] = { RC_HT_S_20, WLAN_RC_PHY_HT_20_SS, 52000,
210 48100, 5, 5, 8, 47, 17, 47 }, /* 52 Mb */
211 [18] = { RC_HT_S_20, WLAN_RC_PHY_HT_20_SS, 58500,
212 53500, 6, 6, 8, 48, 18, 48 }, /* 58.5 Mb */
213 [19] = { RC_HT_S_20, WLAN_RC_PHY_HT_20_SS, 65000,
214 59000, 7, 7, 8, 49, 20, 50 }, /* 65 Mb */
215 [20] = { RC_HT_S_20, WLAN_RC_PHY_HT_20_SS_HGI, 72200,
216 65400, 7, 7, 8, 49, 20, 50 }, /* 65 Mb*/
217 [21] = { RC_INVALID, WLAN_RC_PHY_HT_20_DS, 13000,
218 12700, 8, 8, 4, 51, 21, 51 }, /* 13 Mb */
219 [22] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_DS, 26000,
220 24800, 9, 9, 6, 52, 22, 52 }, /* 26 Mb */
221 [23] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_DS, 39000,
222 36600, 10, 10, 6, 53, 23, 53 }, /* 39 Mb */
223 [24] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 52000,
224 48100, 11, 11, 8, 54, 24, 54 }, /* 52 Mb */
225 [25] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 78000,
226 69500, 12, 12, 8, 55, 25, 55 }, /* 78 Mb */
227 [26] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 104000,
228 89500, 13, 13, 8, 56, 26, 56 }, /* 104 Mb */
229 [27] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 117000,
230 98900, 14, 14, 8, 57, 27, 57 }, /* 117 Mb */
231 [28] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS, 130000,
232 108300, 15, 15, 8, 58, 29, 59 }, /* 130 Mb */
233 [29] = { RC_HT_DT_20, WLAN_RC_PHY_HT_20_DS_HGI, 144400,
234 120000, 15, 15, 8, 58, 29, 59 }, /* 144.4 Mb */
235 [30] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 19500,
236 17400, 16, 16, 4, 60, 30, 60 }, /* 19.5 Mb */
237 [31] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 39000,
238 35100, 17, 17, 6, 61, 31, 61 }, /* 39 Mb */
239 [32] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 58500,
240 52600, 18, 18, 6, 62, 32, 62 }, /* 58.5 Mb */
241 [33] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 78000,
242 70400, 19, 19, 8, 63, 33, 63 }, /* 78 Mb */
243 [34] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS, 117000,
244 104900, 20, 20, 8, 64, 35, 65 }, /* 117 Mb */
245 [35] = { RC_INVALID, WLAN_RC_PHY_HT_20_TS_HGI, 130000,
246 115800, 20, 20, 8, 64, 35, 65 }, /* 130 Mb */
247 [36] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS, 156000,
248 137200, 21, 21, 8, 66, 37, 67 }, /* 156 Mb */
249 [37] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS_HGI, 173300,
250 151100, 21, 21, 8, 66, 37, 67 }, /* 173.3 Mb */
251 [38] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS, 175500,
252 152800, 22, 22, 8, 68, 39, 69 }, /* 175.5 Mb */
253 [39] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS_HGI, 195000,
254 168400, 22, 22, 8, 68, 39, 69 }, /* 195 Mb */
255 [40] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS, 195000,
256 168400, 23, 23, 8, 70, 41, 71 }, /* 195 Mb */
257 [41] = { RC_HT_T_20, WLAN_RC_PHY_HT_20_TS_HGI, 216700,
258 185000, 23, 23, 8, 70, 41, 71 }, /* 216.7 Mb */
259 [42] = { RC_HT_SDT_40, WLAN_RC_PHY_HT_40_SS, 13500,
260 13200, 0, 0, 8, 42, 42, 42 }, /* 13.5 Mb */
261 [43] = { RC_HT_SDT_40, WLAN_RC_PHY_HT_40_SS, 27500,
262 25900, 1, 1, 8, 43, 43, 43 }, /* 27.0 Mb */
263 [44] = { RC_HT_SDT_40, WLAN_RC_PHY_HT_40_SS, 40500,
264 38600, 2, 2, 8, 44, 44, 44 }, /* 40.5 Mb */
265 [45] = { RC_HT_SD_40, WLAN_RC_PHY_HT_40_SS, 54000,
266 49800, 3, 3, 8, 45, 45, 45 }, /* 54 Mb */
267 [46] = { RC_HT_SD_40, WLAN_RC_PHY_HT_40_SS, 81500,
268 72200, 4, 4, 8, 46, 46, 46 }, /* 81 Mb */
269 [47] = { RC_HT_S_40 , WLAN_RC_PHY_HT_40_SS, 108000,
270 92900, 5, 5, 8, 47, 47, 47 }, /* 108 Mb */
271 [48] = { RC_HT_S_40, WLAN_RC_PHY_HT_40_SS, 121500,
272 102700, 6, 6, 8, 48, 48, 48 }, /* 121.5 Mb */
273 [49] = { RC_HT_S_40, WLAN_RC_PHY_HT_40_SS, 135000,
274 112000, 7, 7, 8, 49, 50, 50 }, /* 135 Mb */
275 [50] = { RC_HT_S_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000,
276 122000, 7, 7, 8, 49, 50, 50 }, /* 150 Mb */
277 [51] = { RC_INVALID, WLAN_RC_PHY_HT_40_DS, 27000,
278 25800, 8, 8, 8, 51, 51, 51 }, /* 27 Mb */
279 [52] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_DS, 54000,
280 49800, 9, 9, 8, 52, 52, 52 }, /* 54 Mb */
281 [53] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_DS, 81000,
282 71900, 10, 10, 8, 53, 53, 53 }, /* 81 Mb */
283 [54] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 108000,
284 92500, 11, 11, 8, 54, 54, 54 }, /* 108 Mb */
285 [55] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 162000,
286 130300, 12, 12, 8, 55, 55, 55 }, /* 162 Mb */
287 [56] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 216000,
288 162800, 13, 13, 8, 56, 56, 56 }, /* 216 Mb */
289 [57] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 243000,
290 178200, 14, 14, 8, 57, 57, 57 }, /* 243 Mb */
291 [58] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS, 270000,
292 192100, 15, 15, 8, 58, 59, 59 }, /* 270 Mb */
293 [59] = { RC_HT_DT_40, WLAN_RC_PHY_HT_40_DS_HGI, 300000,
294 207000, 15, 15, 8, 58, 59, 59 }, /* 300 Mb */
295 [60] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 40500,
296 36100, 16, 16, 8, 60, 60, 60 }, /* 40.5 Mb */
297 [61] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 81000,
298 72900, 17, 17, 8, 61, 61, 61 }, /* 81 Mb */
299 [62] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 121500,
300 108300, 18, 18, 8, 62, 62, 62 }, /* 121.5 Mb */
301 [63] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 162000,
302 142000, 19, 19, 8, 63, 63, 63 }, /* 162 Mb */
303 [64] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS, 243000,
304 205100, 20, 20, 8, 64, 65, 65 }, /* 243 Mb */
305 [65] = { RC_INVALID, WLAN_RC_PHY_HT_40_TS_HGI, 270000,
306 224700, 20, 20, 8, 64, 65, 65 }, /* 270 Mb */
307 [66] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS, 324000,
308 263100, 21, 21, 8, 66, 67, 67 }, /* 324 Mb */
309 [67] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS_HGI, 360000,
310 288000, 21, 21, 8, 66, 67, 67 }, /* 360 Mb */
311 [68] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS, 364500,
312 290700, 22, 22, 8, 68, 69, 69 }, /* 364.5 Mb */
313 [69] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS_HGI, 405000,
314 317200, 22, 22, 8, 68, 69, 69 }, /* 405 Mb */
315 [70] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS, 405000,
316 317200, 23, 23, 8, 70, 71, 71 }, /* 405 Mb */
317 [71] = { RC_HT_T_40, WLAN_RC_PHY_HT_40_TS_HGI, 450000,
318 346400, 23, 23, 8, 70, 71, 71 }, /* 450 Mb */
319 },
320 50, /* probe interval */
321 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
322 };
323
324 static const struct ath_rate_table ar5416_11a_ratetable = {
325 8,
326 0,
327 {
328 { RC_L_SDT, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
329 5400, 0, 12, 0},
330 { RC_L_SDT, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
331 7800, 1, 18, 0},
332 { RC_L_SDT, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
333 10000, 2, 24, 2},
334 { RC_L_SDT, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
335 13900, 3, 36, 2},
336 { RC_L_SDT, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
337 17300, 4, 48, 4},
338 { RC_L_SDT, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
339 23000, 5, 72, 4},
340 { RC_L_SDT, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
341 27400, 6, 96, 4},
342 { RC_L_SDT, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
343 29300, 7, 108, 4},
344 },
345 50, /* probe interval */
346 0, /* Phy rates allowed initially */
347 };
348
349 static const struct ath_rate_table ar5416_11g_ratetable = {
350 12,
351 0,
352 {
353 { RC_L_SDT, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
354 900, 0, 2, 0},
355 { RC_L_SDT, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
356 1900, 1, 4, 1},
357 { RC_L_SDT, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
358 4900, 2, 11, 2},
359 { RC_L_SDT, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
360 8100, 3, 22, 3},
361 { RC_INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
362 5400, 4, 12, 4},
363 { RC_INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
364 7800, 5, 18, 4},
365 { RC_L_SDT, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
366 10000, 6, 24, 6},
367 { RC_L_SDT, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
368 13900, 7, 36, 6},
369 { RC_L_SDT, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
370 17300, 8, 48, 8},
371 { RC_L_SDT, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
372 23000, 9, 72, 8},
373 { RC_L_SDT, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
374 27400, 10, 96, 8},
375 { RC_L_SDT, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
376 29300, 11, 108, 8},
377 },
378 50, /* probe interval */
379 0, /* Phy rates allowed initially */
380 };
381
382 static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
383 struct ieee80211_tx_rate *rate)
384 {
385 int rix = 0, i = 0;
386 static const int mcs_rix_off[] = { 7, 15, 20, 21, 22, 23 };
387
388 if (!(rate->flags & IEEE80211_TX_RC_MCS))
389 return rate->idx;
390
391 while (i < ARRAY_SIZE(mcs_rix_off) && rate->idx > mcs_rix_off[i]) {
392 rix++; i++;
393 }
394
395 rix += rate->idx + rate_table->mcs_start;
396
397 if ((rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
398 (rate->flags & IEEE80211_TX_RC_SHORT_GI))
399 rix = rate_table->info[rix].ht_index;
400 else if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
401 rix = rate_table->info[rix].sgi_index;
402 else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
403 rix = rate_table->info[rix].cw40index;
404
405 return rix;
406 }
407
408 static void ath_rc_sort_validrates(struct ath_rate_priv *ath_rc_priv)
409 {
410 const struct ath_rate_table *rate_table = ath_rc_priv->rate_table;
411 u8 i, j, idx, idx_next;
412
413 for (i = ath_rc_priv->max_valid_rate - 1; i > 0; i--) {
414 for (j = 0; j <= i-1; j++) {
415 idx = ath_rc_priv->valid_rate_index[j];
416 idx_next = ath_rc_priv->valid_rate_index[j+1];
417
418 if (rate_table->info[idx].ratekbps >
419 rate_table->info[idx_next].ratekbps) {
420 ath_rc_priv->valid_rate_index[j] = idx_next;
421 ath_rc_priv->valid_rate_index[j+1] = idx;
422 }
423 }
424 }
425 }
426
427 static inline void ath_rc_set_valid_rate_idx(struct ath_rate_priv *ath_rc_priv,
428 u8 index, int valid_tx_rate)
429 {
430 BUG_ON(index > ath_rc_priv->rate_table_size);
431 ath_rc_priv->valid_rate_index[index] = !!valid_tx_rate;
432 }
433
434 static inline
435 int ath_rc_get_nextvalid_txrate(const struct ath_rate_table *rate_table,
436 struct ath_rate_priv *ath_rc_priv,
437 u8 cur_valid_txrate,
438 u8 *next_idx)
439 {
440 u8 i;
441
442 for (i = 0; i < ath_rc_priv->max_valid_rate - 1; i++) {
443 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
444 *next_idx = ath_rc_priv->valid_rate_index[i+1];
445 return 1;
446 }
447 }
448
449 /* No more valid rates */
450 *next_idx = 0;
451
452 return 0;
453 }
454
455 /* Return true only for single stream */
456
457 static int ath_rc_valid_phyrate(u32 phy, u32 capflag, int ignore_cw)
458 {
459 if (WLAN_RC_PHY_HT(phy) && !(capflag & WLAN_RC_HT_FLAG))
460 return 0;
461 if (WLAN_RC_PHY_DS(phy) && !(capflag & WLAN_RC_DS_FLAG))
462 return 0;
463 if (WLAN_RC_PHY_TS(phy) && !(capflag & WLAN_RC_TS_FLAG))
464 return 0;
465 if (WLAN_RC_PHY_SGI(phy) && !(capflag & WLAN_RC_SGI_FLAG))
466 return 0;
467 if (!ignore_cw && WLAN_RC_PHY_HT(phy))
468 if (WLAN_RC_PHY_40(phy) && !(capflag & WLAN_RC_40_FLAG))
469 return 0;
470 return 1;
471 }
472
473 static inline int
474 ath_rc_get_lower_rix(struct ath_rate_priv *ath_rc_priv,
475 u8 cur_valid_txrate, u8 *next_idx)
476 {
477 int8_t i;
478
479 for (i = 1; i < ath_rc_priv->max_valid_rate ; i++) {
480 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
481 *next_idx = ath_rc_priv->valid_rate_index[i-1];
482 return 1;
483 }
484 }
485
486 return 0;
487 }
488
489 static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv)
490 {
491 const struct ath_rate_table *rate_table = ath_rc_priv->rate_table;
492 u8 i, hi = 0;
493
494 for (i = 0; i < rate_table->rate_cnt; i++) {
495 if (rate_table->info[i].rate_flags & RC_LEGACY) {
496 u32 phy = rate_table->info[i].phy;
497 u8 valid_rate_count = 0;
498
499 if (!ath_rc_valid_phyrate(phy, ath_rc_priv->ht_cap, 0))
500 continue;
501
502 valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];
503
504 ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = i;
505 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
506 ath_rc_set_valid_rate_idx(ath_rc_priv, i, 1);
507 hi = i;
508 }
509 }
510
511 return hi;
512 }
513
514 static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv)
515 {
516 const struct ath_rate_table *rate_table = ath_rc_priv->rate_table;
517 struct ath_rateset *rateset = &ath_rc_priv->neg_rates;
518 u32 phy, capflag = ath_rc_priv->ht_cap;
519 u16 rate_flags;
520 u8 i, j, hi = 0, rate, dot11rate, valid_rate_count;
521
522 for (i = 0; i < rateset->rs_nrates; i++) {
523 for (j = 0; j < rate_table->rate_cnt; j++) {
524 phy = rate_table->info[j].phy;
525 rate_flags = rate_table->info[j].rate_flags;
526 rate = rateset->rs_rates[i];
527 dot11rate = rate_table->info[j].dot11rate;
528
529 if (rate != dot11rate
530 || ((rate_flags & WLAN_RC_CAP_MODE(capflag)) !=
531 WLAN_RC_CAP_MODE(capflag))
532 || !(rate_flags & WLAN_RC_CAP_STREAM(capflag))
533 || WLAN_RC_PHY_HT(phy))
534 continue;
535
536 if (!ath_rc_valid_phyrate(phy, capflag, 0))
537 continue;
538
539 valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];
540 ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = j;
541 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
542 ath_rc_set_valid_rate_idx(ath_rc_priv, j, 1);
543 hi = max(hi, j);
544 }
545 }
546
547 return hi;
548 }
549
550 static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv)
551 {
552 const struct ath_rate_table *rate_table = ath_rc_priv->rate_table;
553 struct ath_rateset *rateset = &ath_rc_priv->neg_ht_rates;
554 u32 phy, capflag = ath_rc_priv->ht_cap;
555 u16 rate_flags;
556 u8 i, j, hi = 0, rate, dot11rate, valid_rate_count;
557
558 for (i = 0; i < rateset->rs_nrates; i++) {
559 for (j = 0; j < rate_table->rate_cnt; j++) {
560 phy = rate_table->info[j].phy;
561 rate_flags = rate_table->info[j].rate_flags;
562 rate = rateset->rs_rates[i];
563 dot11rate = rate_table->info[j].dot11rate;
564
565 if ((rate != dot11rate) || !WLAN_RC_PHY_HT(phy) ||
566 !(rate_flags & WLAN_RC_CAP_STREAM(capflag)) ||
567 !WLAN_RC_PHY_HT_VALID(rate_flags, capflag))
568 continue;
569
570 if (!ath_rc_valid_phyrate(phy, capflag, 0))
571 continue;
572
573 valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];
574 ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = j;
575 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
576 ath_rc_set_valid_rate_idx(ath_rc_priv, j, 1);
577 hi = max(hi, j);
578 }
579 }
580
581 return hi;
582 }
583
584 static u8 ath_rc_get_highest_rix(struct ath_rate_priv *ath_rc_priv,
585 int *is_probing)
586 {
587 const struct ath_rate_table *rate_table = ath_rc_priv->rate_table;
588 u32 best_thruput, this_thruput, now_msec;
589 u8 rate, next_rate, best_rate, maxindex, minindex;
590 int8_t index = 0;
591
592 now_msec = jiffies_to_msecs(jiffies);
593 *is_probing = 0;
594 best_thruput = 0;
595 maxindex = ath_rc_priv->max_valid_rate-1;
596 minindex = 0;
597 best_rate = minindex;
598
599 /*
600 * Try the higher rate first. It will reduce memory moving time
601 * if we have very good channel characteristics.
602 */
603 for (index = maxindex; index >= minindex ; index--) {
604 u8 per_thres;
605
606 rate = ath_rc_priv->valid_rate_index[index];
607 if (rate > ath_rc_priv->rate_max_phy)
608 continue;
609
610 /*
611 * For TCP the average collision rate is around 11%,
612 * so we ignore PERs less than this. This is to
613 * prevent the rate we are currently using (whose
614 * PER might be in the 10-15 range because of TCP
615 * collisions) looking worse than the next lower
616 * rate whose PER has decayed close to 0. If we
617 * used to next lower rate, its PER would grow to
618 * 10-15 and we would be worse off then staying
619 * at the current rate.
620 */
621 per_thres = ath_rc_priv->per[rate];
622 if (per_thres < 12)
623 per_thres = 12;
624
625 this_thruput = rate_table->info[rate].user_ratekbps *
626 (100 - per_thres);
627
628 if (best_thruput <= this_thruput) {
629 best_thruput = this_thruput;
630 best_rate = rate;
631 }
632 }
633
634 rate = best_rate;
635
636 /*
637 * Must check the actual rate (ratekbps) to account for
638 * non-monoticity of 11g's rate table
639 */
640
641 if (rate >= ath_rc_priv->rate_max_phy) {
642 rate = ath_rc_priv->rate_max_phy;
643
644 /* Probe the next allowed phy state */
645 if (ath_rc_get_nextvalid_txrate(rate_table,
646 ath_rc_priv, rate, &next_rate) &&
647 (now_msec - ath_rc_priv->probe_time >
648 rate_table->probe_interval) &&
649 (ath_rc_priv->hw_maxretry_pktcnt >= 1)) {
650 rate = next_rate;
651 ath_rc_priv->probe_rate = rate;
652 ath_rc_priv->probe_time = now_msec;
653 ath_rc_priv->hw_maxretry_pktcnt = 0;
654 *is_probing = 1;
655 }
656 }
657
658 if (rate > (ath_rc_priv->rate_table_size - 1))
659 rate = ath_rc_priv->rate_table_size - 1;
660
661 if (RC_TS_ONLY(rate_table->info[rate].rate_flags) &&
662 (ath_rc_priv->ht_cap & WLAN_RC_TS_FLAG))
663 return rate;
664
665 if (RC_DS_OR_LATER(rate_table->info[rate].rate_flags) &&
666 (ath_rc_priv->ht_cap & (WLAN_RC_DS_FLAG | WLAN_RC_TS_FLAG)))
667 return rate;
668
669 if (RC_SS_OR_LEGACY(rate_table->info[rate].rate_flags))
670 return rate;
671
672 /* This should not happen */
673 WARN_ON_ONCE(1);
674
675 rate = ath_rc_priv->valid_rate_index[0];
676
677 return rate;
678 }
679
680 static void ath_rc_rate_set_series(const struct ath_rate_table *rate_table,
681 struct ieee80211_tx_rate *rate,
682 struct ieee80211_tx_rate_control *txrc,
683 u8 tries, u8 rix, int rtsctsenable)
684 {
685 rate->count = tries;
686 rate->idx = rate_table->info[rix].ratecode;
687
688 if (txrc->short_preamble)
689 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
690 if (txrc->rts || rtsctsenable)
691 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
692
693 if (WLAN_RC_PHY_HT(rate_table->info[rix].phy)) {
694 rate->flags |= IEEE80211_TX_RC_MCS;
695 if (WLAN_RC_PHY_40(rate_table->info[rix].phy) &&
696 conf_is_ht40(&txrc->hw->conf))
697 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
698 if (WLAN_RC_PHY_SGI(rate_table->info[rix].phy))
699 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
700 }
701 }
702
703 static void ath_rc_rate_set_rtscts(struct ath_softc *sc,
704 const struct ath_rate_table *rate_table,
705 struct ieee80211_tx_info *tx_info)
706 {
707 struct ieee80211_tx_rate *rates = tx_info->control.rates;
708 int i = 0, rix = 0, cix, enable_g_protection = 0;
709
710 /* get the cix for the lowest valid rix */
711 for (i = 3; i >= 0; i--) {
712 if (rates[i].count && (rates[i].idx >= 0)) {
713 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
714 break;
715 }
716 }
717 cix = rate_table->info[rix].ctrl_rate;
718
719 /* All protection frames are transmited at 2Mb/s for 802.11g,
720 * otherwise we transmit them at 1Mb/s */
721 if (sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ &&
722 !conf_is_ht(&sc->hw->conf))
723 enable_g_protection = 1;
724
725 /*
726 * If 802.11g protection is enabled, determine whether to use RTS/CTS or
727 * just CTS. Note that this is only done for OFDM/HT unicast frames.
728 */
729 if ((tx_info->control.vif &&
730 tx_info->control.vif->bss_conf.use_cts_prot) &&
731 (rate_table->info[rix].phy == WLAN_RC_PHY_OFDM ||
732 WLAN_RC_PHY_HT(rate_table->info[rix].phy))) {
733 rates[0].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
734 cix = rate_table->info[enable_g_protection].ctrl_rate;
735 }
736
737 tx_info->control.rts_cts_rate_idx = cix;
738 }
739
740 static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
741 struct ieee80211_tx_rate_control *txrc)
742 {
743 struct ath_softc *sc = priv;
744 struct ath_rate_priv *ath_rc_priv = priv_sta;
745 const struct ath_rate_table *rate_table;
746 struct sk_buff *skb = txrc->skb;
747 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
748 struct ieee80211_tx_rate *rates = tx_info->control.rates;
749 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
750 __le16 fc = hdr->frame_control;
751 u8 try_per_rate, i = 0, rix;
752 int is_probe = 0;
753
754 if (rate_control_send_low(sta, priv_sta, txrc))
755 return;
756
757 /*
758 * For Multi Rate Retry we use a different number of
759 * retry attempt counts. This ends up looking like this:
760 *
761 * MRR[0] = 4
762 * MRR[1] = 4
763 * MRR[2] = 4
764 * MRR[3] = 8
765 *
766 */
767 try_per_rate = 4;
768
769 rate_table = ath_rc_priv->rate_table;
770 rix = ath_rc_get_highest_rix(ath_rc_priv, &is_probe);
771
772 if (conf_is_ht(&sc->hw->conf) &&
773 (sta->ht_cap.cap & IEEE80211_HT_CAP_LDPC_CODING))
774 tx_info->flags |= IEEE80211_TX_CTL_LDPC;
775
776 if (conf_is_ht(&sc->hw->conf) &&
777 (sta->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
778 tx_info->flags |= (1 << IEEE80211_TX_CTL_STBC_SHIFT);
779
780 if (is_probe) {
781 /*
782 * Set one try for probe rates. For the
783 * probes don't enable RTS.
784 */
785 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
786 1, rix, 0);
787 /*
788 * Get the next tried/allowed rate.
789 * No RTS for the next series after the probe rate.
790 */
791 ath_rc_get_lower_rix(ath_rc_priv, rix, &rix);
792 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
793 try_per_rate, rix, 0);
794
795 tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
796 } else {
797 /*
798 * Set the chosen rate. No RTS for first series entry.
799 */
800 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
801 try_per_rate, rix, 0);
802 }
803
804 for ( ; i < 4; i++) {
805 /*
806 * Use twice the number of tries for the last MRR segment.
807 */
808 if (i + 1 == 4)
809 try_per_rate = 8;
810
811 ath_rc_get_lower_rix(ath_rc_priv, rix, &rix);
812
813 /*
814 * All other rates in the series have RTS enabled.
815 */
816 ath_rc_rate_set_series(rate_table, &rates[i], txrc,
817 try_per_rate, rix, 1);
818 }
819
820 /*
821 * NB:Change rate series to enable aggregation when operating
822 * at lower MCS rates. When first rate in series is MCS2
823 * in HT40 @ 2.4GHz, series should look like:
824 *
825 * {MCS2, MCS1, MCS0, MCS0}.
826 *
827 * When first rate in series is MCS3 in HT20 @ 2.4GHz, series should
828 * look like:
829 *
830 * {MCS3, MCS2, MCS1, MCS1}
831 *
832 * So, set fourth rate in series to be same as third one for
833 * above conditions.
834 */
835 if ((sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ) &&
836 (conf_is_ht(&sc->hw->conf))) {
837 u8 dot11rate = rate_table->info[rix].dot11rate;
838 u8 phy = rate_table->info[rix].phy;
839 if (i == 4 &&
840 ((dot11rate == 2 && phy == WLAN_RC_PHY_HT_40_SS) ||
841 (dot11rate == 3 && phy == WLAN_RC_PHY_HT_20_SS))) {
842 rates[3].idx = rates[2].idx;
843 rates[3].flags = rates[2].flags;
844 }
845 }
846
847 /*
848 * Force hardware to use computed duration for next
849 * fragment by disabling multi-rate retry, which
850 * updates duration based on the multi-rate duration table.
851 *
852 * FIXME: Fix duration
853 */
854 if (ieee80211_has_morefrags(fc) ||
855 (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) {
856 rates[1].count = rates[2].count = rates[3].count = 0;
857 rates[1].idx = rates[2].idx = rates[3].idx = 0;
858 rates[0].count = ATH_TXMAXTRY;
859 }
860
861 /* Setup RTS/CTS */
862 ath_rc_rate_set_rtscts(sc, rate_table, tx_info);
863 }
864
865 static void ath_rc_update_per(struct ath_softc *sc,
866 const struct ath_rate_table *rate_table,
867 struct ath_rate_priv *ath_rc_priv,
868 struct ieee80211_tx_info *tx_info,
869 int tx_rate, int xretries, int retries,
870 u32 now_msec)
871 {
872 int count, n_bad_frames;
873 u8 last_per;
874 static const u32 nretry_to_per_lookup[10] = {
875 100 * 0 / 1,
876 100 * 1 / 4,
877 100 * 1 / 2,
878 100 * 3 / 4,
879 100 * 4 / 5,
880 100 * 5 / 6,
881 100 * 6 / 7,
882 100 * 7 / 8,
883 100 * 8 / 9,
884 100 * 9 / 10
885 };
886
887 last_per = ath_rc_priv->per[tx_rate];
888 n_bad_frames = tx_info->status.ampdu_len - tx_info->status.ampdu_ack_len;
889
890 if (xretries) {
891 if (xretries == 1) {
892 ath_rc_priv->per[tx_rate] += 30;
893 if (ath_rc_priv->per[tx_rate] > 100)
894 ath_rc_priv->per[tx_rate] = 100;
895 } else {
896 /* xretries == 2 */
897 count = ARRAY_SIZE(nretry_to_per_lookup);
898 if (retries >= count)
899 retries = count - 1;
900
901 /* new_PER = 7/8*old_PER + 1/8*(currentPER) */
902 ath_rc_priv->per[tx_rate] =
903 (u8)(last_per - (last_per >> 3) + (100 >> 3));
904 }
905
906 /* xretries == 1 or 2 */
907
908 if (ath_rc_priv->probe_rate == tx_rate)
909 ath_rc_priv->probe_rate = 0;
910
911 } else { /* xretries == 0 */
912 count = ARRAY_SIZE(nretry_to_per_lookup);
913 if (retries >= count)
914 retries = count - 1;
915
916 if (n_bad_frames) {
917 /* new_PER = 7/8*old_PER + 1/8*(currentPER)
918 * Assuming that n_frames is not 0. The current PER
919 * from the retries is 100 * retries / (retries+1),
920 * since the first retries attempts failed, and the
921 * next one worked. For the one that worked,
922 * n_bad_frames subframes out of n_frames wored,
923 * so the PER for that part is
924 * 100 * n_bad_frames / n_frames, and it contributes
925 * 100 * n_bad_frames / (n_frames * (retries+1)) to
926 * the above PER. The expression below is a
927 * simplified version of the sum of these two terms.
928 */
929 if (tx_info->status.ampdu_len > 0) {
930 int n_frames, n_bad_tries;
931 u8 cur_per, new_per;
932
933 n_bad_tries = retries * tx_info->status.ampdu_len +
934 n_bad_frames;
935 n_frames = tx_info->status.ampdu_len * (retries + 1);
936 cur_per = (100 * n_bad_tries / n_frames) >> 3;
937 new_per = (u8)(last_per - (last_per >> 3) + cur_per);
938 ath_rc_priv->per[tx_rate] = new_per;
939 }
940 } else {
941 ath_rc_priv->per[tx_rate] =
942 (u8)(last_per - (last_per >> 3) +
943 (nretry_to_per_lookup[retries] >> 3));
944 }
945
946
947 /*
948 * If we got at most one retry then increase the max rate if
949 * this was a probe. Otherwise, ignore the probe.
950 */
951 if (ath_rc_priv->probe_rate && ath_rc_priv->probe_rate == tx_rate) {
952 if (retries > 0 || 2 * n_bad_frames > tx_info->status.ampdu_len) {
953 /*
954 * Since we probed with just a single attempt,
955 * any retries means the probe failed. Also,
956 * if the attempt worked, but more than half
957 * the subframes were bad then also consider
958 * the probe a failure.
959 */
960 ath_rc_priv->probe_rate = 0;
961 } else {
962 u8 probe_rate = 0;
963
964 ath_rc_priv->rate_max_phy =
965 ath_rc_priv->probe_rate;
966 probe_rate = ath_rc_priv->probe_rate;
967
968 if (ath_rc_priv->per[probe_rate] > 30)
969 ath_rc_priv->per[probe_rate] = 20;
970
971 ath_rc_priv->probe_rate = 0;
972
973 /*
974 * Since this probe succeeded, we allow the next
975 * probe twice as soon. This allows the maxRate
976 * to move up faster if the probes are
977 * successful.
978 */
979 ath_rc_priv->probe_time =
980 now_msec - rate_table->probe_interval / 2;
981 }
982 }
983
984 if (retries > 0) {
985 /*
986 * Don't update anything. We don't know if
987 * this was because of collisions or poor signal.
988 */
989 ath_rc_priv->hw_maxretry_pktcnt = 0;
990 } else {
991 /*
992 * It worked with no retries. First ignore bogus (small)
993 * rssi_ack values.
994 */
995 if (tx_rate == ath_rc_priv->rate_max_phy &&
996 ath_rc_priv->hw_maxretry_pktcnt < 255) {
997 ath_rc_priv->hw_maxretry_pktcnt++;
998 }
999
1000 }
1001 }
1002 }
1003
1004 static void ath_debug_stat_retries(struct ath_rate_priv *rc, int rix,
1005 int xretries, int retries, u8 per)
1006 {
1007 struct ath_rc_stats *stats = &rc->rcstats[rix];
1008
1009 stats->xretries += xretries;
1010 stats->retries += retries;
1011 stats->per = per;
1012 }
1013
1014 /* Update PER, RSSI and whatever else that the code thinks it is doing.
1015 If you can make sense of all this, you really need to go out more. */
1016
1017 static void ath_rc_update_ht(struct ath_softc *sc,
1018 struct ath_rate_priv *ath_rc_priv,
1019 struct ieee80211_tx_info *tx_info,
1020 int tx_rate, int xretries, int retries)
1021 {
1022 u32 now_msec = jiffies_to_msecs(jiffies);
1023 int rate;
1024 u8 last_per;
1025 const struct ath_rate_table *rate_table = ath_rc_priv->rate_table;
1026 int size = ath_rc_priv->rate_table_size;
1027
1028 if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
1029 return;
1030
1031 last_per = ath_rc_priv->per[tx_rate];
1032
1033 /* Update PER first */
1034 ath_rc_update_per(sc, rate_table, ath_rc_priv,
1035 tx_info, tx_rate, xretries,
1036 retries, now_msec);
1037
1038 /*
1039 * If this rate looks bad (high PER) then stop using it for
1040 * a while (except if we are probing).
1041 */
1042 if (ath_rc_priv->per[tx_rate] >= 55 && tx_rate > 0 &&
1043 rate_table->info[tx_rate].ratekbps <=
1044 rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
1045 ath_rc_get_lower_rix(ath_rc_priv, (u8)tx_rate,
1046 &ath_rc_priv->rate_max_phy);
1047
1048 /* Don't probe for a little while. */
1049 ath_rc_priv->probe_time = now_msec;
1050 }
1051
1052 /* Make sure the rates below this have lower PER */
1053 /* Monotonicity is kept only for rates below the current rate. */
1054 if (ath_rc_priv->per[tx_rate] < last_per) {
1055 for (rate = tx_rate - 1; rate >= 0; rate--) {
1056
1057 if (ath_rc_priv->per[rate] >
1058 ath_rc_priv->per[rate+1]) {
1059 ath_rc_priv->per[rate] =
1060 ath_rc_priv->per[rate+1];
1061 }
1062 }
1063 }
1064
1065 /* Maintain monotonicity for rates above the current rate */
1066 for (rate = tx_rate; rate < size - 1; rate++) {
1067 if (ath_rc_priv->per[rate+1] <
1068 ath_rc_priv->per[rate])
1069 ath_rc_priv->per[rate+1] =
1070 ath_rc_priv->per[rate];
1071 }
1072
1073 /* Every so often, we reduce the thresholds
1074 * and PER (different for CCK and OFDM). */
1075 if (now_msec - ath_rc_priv->per_down_time >=
1076 rate_table->probe_interval) {
1077 for (rate = 0; rate < size; rate++) {
1078 ath_rc_priv->per[rate] =
1079 7 * ath_rc_priv->per[rate] / 8;
1080 }
1081
1082 ath_rc_priv->per_down_time = now_msec;
1083 }
1084
1085 ath_debug_stat_retries(ath_rc_priv, tx_rate, xretries, retries,
1086 ath_rc_priv->per[tx_rate]);
1087
1088 }
1089
1090
1091 static void ath_rc_tx_status(struct ath_softc *sc,
1092 struct ath_rate_priv *ath_rc_priv,
1093 struct ieee80211_tx_info *tx_info,
1094 int final_ts_idx, int xretries, int long_retry)
1095 {
1096 const struct ath_rate_table *rate_table;
1097 struct ieee80211_tx_rate *rates = tx_info->status.rates;
1098 u8 flags;
1099 u32 i = 0, rix;
1100
1101 rate_table = ath_rc_priv->rate_table;
1102
1103 /*
1104 * If the first rate is not the final index, there
1105 * are intermediate rate failures to be processed.
1106 */
1107 if (final_ts_idx != 0) {
1108 /* Process intermediate rates that failed.*/
1109 for (i = 0; i < final_ts_idx ; i++) {
1110 if (rates[i].count != 0 && (rates[i].idx >= 0)) {
1111 flags = rates[i].flags;
1112
1113 /* If HT40 and we have switched mode from
1114 * 40 to 20 => don't update */
1115
1116 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1117 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
1118 return;
1119
1120 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
1121 ath_rc_update_ht(sc, ath_rc_priv, tx_info,
1122 rix, xretries ? 1 : 2,
1123 rates[i].count);
1124 }
1125 }
1126 } else {
1127 /*
1128 * Handle the special case of MIMO PS burst, where the second
1129 * aggregate is sent out with only one rate and one try.
1130 * Treating it as an excessive retry penalizes the rate
1131 * inordinately.
1132 */
1133 if (rates[0].count == 1 && xretries == 1)
1134 xretries = 2;
1135 }
1136
1137 flags = rates[i].flags;
1138
1139 /* If HT40 and we have switched mode from 40 to 20 => don't update */
1140 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1141 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
1142 return;
1143
1144 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
1145 ath_rc_update_ht(sc, ath_rc_priv, tx_info, rix, xretries, long_retry);
1146 }
1147
1148 static const
1149 struct ath_rate_table *ath_choose_rate_table(struct ath_softc *sc,
1150 enum ieee80211_band band,
1151 bool is_ht)
1152 {
1153 switch(band) {
1154 case IEEE80211_BAND_2GHZ:
1155 if (is_ht)
1156 return &ar5416_11ng_ratetable;
1157 return &ar5416_11g_ratetable;
1158 case IEEE80211_BAND_5GHZ:
1159 if (is_ht)
1160 return &ar5416_11na_ratetable;
1161 return &ar5416_11a_ratetable;
1162 default:
1163 return NULL;
1164 }
1165 }
1166
1167 static void ath_rc_init(struct ath_softc *sc,
1168 struct ath_rate_priv *ath_rc_priv)
1169 {
1170 const struct ath_rate_table *rate_table = ath_rc_priv->rate_table;
1171 struct ath_rateset *rateset = &ath_rc_priv->neg_rates;
1172 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1173 u8 i, j, k, hi = 0, hthi = 0;
1174
1175 ath_rc_priv->rate_table_size = RATE_TABLE_SIZE;
1176
1177 for (i = 0 ; i < ath_rc_priv->rate_table_size; i++) {
1178 ath_rc_priv->per[i] = 0;
1179 ath_rc_priv->valid_rate_index[i] = 0;
1180 }
1181
1182 for (i = 0; i < WLAN_RC_PHY_MAX; i++) {
1183 for (j = 0; j < RATE_TABLE_SIZE; j++)
1184 ath_rc_priv->valid_phy_rateidx[i][j] = 0;
1185 ath_rc_priv->valid_phy_ratecnt[i] = 0;
1186 }
1187
1188 if (!rateset->rs_nrates) {
1189 hi = ath_rc_init_validrates(ath_rc_priv);
1190 } else {
1191 hi = ath_rc_setvalid_rates(ath_rc_priv);
1192
1193 if (ath_rc_priv->ht_cap & WLAN_RC_HT_FLAG)
1194 hthi = ath_rc_setvalid_htrates(ath_rc_priv);
1195
1196 hi = max(hi, hthi);
1197 }
1198
1199 ath_rc_priv->rate_table_size = hi + 1;
1200 ath_rc_priv->rate_max_phy = 0;
1201 WARN_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);
1202
1203 for (i = 0, k = 0; i < WLAN_RC_PHY_MAX; i++) {
1204 for (j = 0; j < ath_rc_priv->valid_phy_ratecnt[i]; j++) {
1205 ath_rc_priv->valid_rate_index[k++] =
1206 ath_rc_priv->valid_phy_rateidx[i][j];
1207 }
1208
1209 if (!ath_rc_valid_phyrate(i, rate_table->initial_ratemax, 1) ||
1210 !ath_rc_priv->valid_phy_ratecnt[i])
1211 continue;
1212
1213 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_phy_rateidx[i][j-1];
1214 }
1215 WARN_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);
1216 WARN_ON(k > RATE_TABLE_SIZE);
1217
1218 ath_rc_priv->max_valid_rate = k;
1219 ath_rc_sort_validrates(ath_rc_priv);
1220 ath_rc_priv->rate_max_phy = (k > 4) ?
1221 ath_rc_priv->valid_rate_index[k-4] :
1222 ath_rc_priv->valid_rate_index[k-1];
1223
1224 ath_dbg(common, CONFIG, "RC Initialized with capabilities: 0x%x\n",
1225 ath_rc_priv->ht_cap);
1226 }
1227
1228 static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta)
1229 {
1230 u8 caps = 0;
1231
1232 if (sta->ht_cap.ht_supported) {
1233 caps = WLAN_RC_HT_FLAG;
1234 if (sta->ht_cap.mcs.rx_mask[1] && sta->ht_cap.mcs.rx_mask[2])
1235 caps |= WLAN_RC_TS_FLAG | WLAN_RC_DS_FLAG;
1236 else if (sta->ht_cap.mcs.rx_mask[1])
1237 caps |= WLAN_RC_DS_FLAG;
1238 if (sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1239 caps |= WLAN_RC_40_FLAG;
1240 if (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40 ||
1241 sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20)
1242 caps |= WLAN_RC_SGI_FLAG;
1243 }
1244
1245 return caps;
1246 }
1247
1248 static bool ath_tx_aggr_check(struct ath_softc *sc, struct ieee80211_sta *sta,
1249 u8 tidno)
1250 {
1251 struct ath_node *an = (struct ath_node *)sta->drv_priv;
1252 struct ath_atx_tid *txtid;
1253
1254 if (!sta->ht_cap.ht_supported)
1255 return false;
1256
1257 txtid = ATH_AN_2_TID(an, tidno);
1258
1259 if (!(txtid->state & (AGGR_ADDBA_COMPLETE | AGGR_ADDBA_PROGRESS)))
1260 return true;
1261 return false;
1262 }
1263
1264
1265 /***********************************/
1266 /* mac80211 Rate Control callbacks */
1267 /***********************************/
1268
1269 static void ath_debug_stat_rc(struct ath_rate_priv *rc, int final_rate)
1270 {
1271 struct ath_rc_stats *stats;
1272
1273 stats = &rc->rcstats[final_rate];
1274 stats->success++;
1275 }
1276
1277
1278 static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
1279 struct ieee80211_sta *sta, void *priv_sta,
1280 struct sk_buff *skb)
1281 {
1282 struct ath_softc *sc = priv;
1283 struct ath_rate_priv *ath_rc_priv = priv_sta;
1284 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1285 struct ieee80211_hdr *hdr;
1286 int final_ts_idx = 0, tx_status = 0;
1287 int long_retry = 0;
1288 __le16 fc;
1289 int i;
1290
1291 hdr = (struct ieee80211_hdr *)skb->data;
1292 fc = hdr->frame_control;
1293 for (i = 0; i < sc->hw->max_rates; i++) {
1294 struct ieee80211_tx_rate *rate = &tx_info->status.rates[i];
1295 if (rate->idx < 0 || !rate->count)
1296 break;
1297
1298 final_ts_idx = i;
1299 long_retry = rate->count - 1;
1300 }
1301
1302 if (!priv_sta || !ieee80211_is_data(fc))
1303 return;
1304
1305 /* This packet was aggregated but doesn't carry status info */
1306 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) &&
1307 !(tx_info->flags & IEEE80211_TX_STAT_AMPDU))
1308 return;
1309
1310 if (tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED)
1311 return;
1312
1313 if (!(tx_info->flags & IEEE80211_TX_STAT_ACK))
1314 tx_status = 1;
1315
1316 ath_rc_tx_status(sc, ath_rc_priv, tx_info, final_ts_idx, tx_status,
1317 long_retry);
1318
1319 /* Check if aggregation has to be enabled for this tid */
1320 if (conf_is_ht(&sc->hw->conf) &&
1321 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
1322 if (ieee80211_is_data_qos(fc) &&
1323 skb_get_queue_mapping(skb) != IEEE80211_AC_VO) {
1324 u8 *qc, tid;
1325
1326 qc = ieee80211_get_qos_ctl(hdr);
1327 tid = qc[0] & 0xf;
1328
1329 if(ath_tx_aggr_check(sc, sta, tid))
1330 ieee80211_start_tx_ba_session(sta, tid, 0);
1331 }
1332 }
1333
1334 ath_debug_stat_rc(ath_rc_priv,
1335 ath_rc_get_rateindex(ath_rc_priv->rate_table,
1336 &tx_info->status.rates[final_ts_idx]));
1337 }
1338
1339 static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
1340 struct ieee80211_sta *sta, void *priv_sta)
1341 {
1342 struct ath_softc *sc = priv;
1343 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1344 struct ath_rate_priv *ath_rc_priv = priv_sta;
1345 int i, j = 0;
1346
1347 for (i = 0; i < sband->n_bitrates; i++) {
1348 if (sta->supp_rates[sband->band] & BIT(i)) {
1349 ath_rc_priv->neg_rates.rs_rates[j]
1350 = (sband->bitrates[i].bitrate * 2) / 10;
1351 j++;
1352 }
1353 }
1354 ath_rc_priv->neg_rates.rs_nrates = j;
1355
1356 if (sta->ht_cap.ht_supported) {
1357 for (i = 0, j = 0; i < 77; i++) {
1358 if (sta->ht_cap.mcs.rx_mask[i/8] & (1<<(i%8)))
1359 ath_rc_priv->neg_ht_rates.rs_rates[j++] = i;
1360 if (j == ATH_RATE_MAX)
1361 break;
1362 }
1363 ath_rc_priv->neg_ht_rates.rs_nrates = j;
1364 }
1365
1366 ath_rc_priv->rate_table = ath_choose_rate_table(sc, sband->band,
1367 sta->ht_cap.ht_supported);
1368 if (!ath_rc_priv->rate_table) {
1369 ath_err(common, "No rate table chosen\n");
1370 return;
1371 }
1372
1373 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta);
1374 ath_rc_init(sc, priv_sta);
1375 }
1376
1377 static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
1378 struct ieee80211_sta *sta, void *priv_sta,
1379 u32 changed)
1380 {
1381 struct ath_softc *sc = priv;
1382 struct ath_rate_priv *ath_rc_priv = priv_sta;
1383
1384 if (changed & IEEE80211_RC_BW_CHANGED) {
1385 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta);
1386 ath_rc_init(sc, priv_sta);
1387
1388 ath_dbg(ath9k_hw_common(sc->sc_ah), CONFIG,
1389 "Operating HT Bandwidth changed to: %d\n",
1390 sc->hw->conf.channel_type);
1391 }
1392 }
1393
1394 #ifdef CONFIG_ATH9K_DEBUGFS
1395
1396 static ssize_t read_file_rcstat(struct file *file, char __user *user_buf,
1397 size_t count, loff_t *ppos)
1398 {
1399 struct ath_rate_priv *rc = file->private_data;
1400 char *buf;
1401 unsigned int len = 0, max;
1402 int i = 0;
1403 ssize_t retval;
1404
1405 if (rc->rate_table == NULL)
1406 return 0;
1407
1408 max = 80 + rc->rate_table_size * 1024 + 1;
1409 buf = kmalloc(max, GFP_KERNEL);
1410 if (buf == NULL)
1411 return -ENOMEM;
1412
1413 len += sprintf(buf, "%6s %6s %6s "
1414 "%10s %10s %10s %10s\n",
1415 "HT", "MCS", "Rate",
1416 "Success", "Retries", "XRetries", "PER");
1417
1418 for (i = 0; i < rc->rate_table_size; i++) {
1419 u32 ratekbps = rc->rate_table->info[i].ratekbps;
1420 struct ath_rc_stats *stats = &rc->rcstats[i];
1421 char mcs[5];
1422 char htmode[5];
1423 int used_mcs = 0, used_htmode = 0;
1424
1425 if (WLAN_RC_PHY_HT(rc->rate_table->info[i].phy)) {
1426 used_mcs = snprintf(mcs, 5, "%d",
1427 rc->rate_table->info[i].ratecode);
1428
1429 if (WLAN_RC_PHY_40(rc->rate_table->info[i].phy))
1430 used_htmode = snprintf(htmode, 5, "HT40");
1431 else if (WLAN_RC_PHY_20(rc->rate_table->info[i].phy))
1432 used_htmode = snprintf(htmode, 5, "HT20");
1433 else
1434 used_htmode = snprintf(htmode, 5, "????");
1435 }
1436
1437 mcs[used_mcs] = '\0';
1438 htmode[used_htmode] = '\0';
1439
1440 len += snprintf(buf + len, max - len,
1441 "%6s %6s %3u.%d: "
1442 "%10u %10u %10u %10u\n",
1443 htmode,
1444 mcs,
1445 ratekbps / 1000,
1446 (ratekbps % 1000) / 100,
1447 stats->success,
1448 stats->retries,
1449 stats->xretries,
1450 stats->per);
1451 }
1452
1453 if (len > max)
1454 len = max;
1455
1456 retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
1457 kfree(buf);
1458 return retval;
1459 }
1460
1461 static const struct file_operations fops_rcstat = {
1462 .read = read_file_rcstat,
1463 .open = simple_open,
1464 .owner = THIS_MODULE
1465 };
1466
1467 static void ath_rate_add_sta_debugfs(void *priv, void *priv_sta,
1468 struct dentry *dir)
1469 {
1470 struct ath_rate_priv *rc = priv_sta;
1471 debugfs_create_file("rc_stats", S_IRUGO, dir, rc, &fops_rcstat);
1472 }
1473
1474 #endif /* CONFIG_ATH9K_DEBUGFS */
1475
1476 static void *ath_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
1477 {
1478 return hw->priv;
1479 }
1480
1481 static void ath_rate_free(void *priv)
1482 {
1483 return;
1484 }
1485
1486 static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
1487 {
1488 struct ath_softc *sc = priv;
1489 struct ath_rate_priv *rate_priv;
1490
1491 rate_priv = kzalloc(sizeof(struct ath_rate_priv), gfp);
1492 if (!rate_priv) {
1493 ath_err(ath9k_hw_common(sc->sc_ah),
1494 "Unable to allocate private rc structure\n");
1495 return NULL;
1496 }
1497
1498 return rate_priv;
1499 }
1500
1501 static void ath_rate_free_sta(void *priv, struct ieee80211_sta *sta,
1502 void *priv_sta)
1503 {
1504 struct ath_rate_priv *rate_priv = priv_sta;
1505 kfree(rate_priv);
1506 }
1507
1508 static struct rate_control_ops ath_rate_ops = {
1509 .module = NULL,
1510 .name = "ath9k_rate_control",
1511 .tx_status = ath_tx_status,
1512 .get_rate = ath_get_rate,
1513 .rate_init = ath_rate_init,
1514 .rate_update = ath_rate_update,
1515 .alloc = ath_rate_alloc,
1516 .free = ath_rate_free,
1517 .alloc_sta = ath_rate_alloc_sta,
1518 .free_sta = ath_rate_free_sta,
1519 #ifdef CONFIG_ATH9K_DEBUGFS
1520 .add_sta_debugfs = ath_rate_add_sta_debugfs,
1521 #endif
1522 };
1523
1524 int ath_rate_control_register(void)
1525 {
1526 return ieee80211_rate_control_register(&ath_rate_ops);
1527 }
1528
1529 void ath_rate_control_unregister(void)
1530 {
1531 ieee80211_rate_control_unregister(&ath_rate_ops);
1532 }
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