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ath9k: remove unused ath_rc_isvalid_txmask()
[linux-2.6.git] / drivers / net / wireless / ath / ath9k / rc.c
blobb0e3702ca06a63e56d5a3c1fd640db15fcbf2d23
1 /*
2 * Copyright (c) 2004 Video54 Technologies, Inc.
3 * Copyright (c) 2004-2009 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 "ath9k.h"
19
20 static const struct ath_rate_table ar5416_11na_ratetable = {
21 42,
22 {
23 { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
24 5400, 0x0b, 0x00, 12,
25 0, 2, 1, 0, 0, 0, 0, 0 },
26 { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
27 7800, 0x0f, 0x00, 18,
28 0, 3, 1, 1, 1, 1, 1, 0 },
29 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
30 10000, 0x0a, 0x00, 24,
31 2, 4, 2, 2, 2, 2, 2, 0 },
32 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
33 13900, 0x0e, 0x00, 36,
34 2, 6, 2, 3, 3, 3, 3, 0 },
35 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
36 17300, 0x09, 0x00, 48,
37 4, 10, 3, 4, 4, 4, 4, 0 },
38 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
39 23000, 0x0d, 0x00, 72,
40 4, 14, 3, 5, 5, 5, 5, 0 },
41 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
42 27400, 0x08, 0x00, 96,
43 4, 20, 3, 6, 6, 6, 6, 0 },
44 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
45 29300, 0x0c, 0x00, 108,
46 4, 23, 3, 7, 7, 7, 7, 0 },
47 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
48 6400, 0x80, 0x00, 0,
49 0, 2, 3, 8, 24, 8, 24, 3216 },
50 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
51 12700, 0x81, 0x00, 1,
52 2, 4, 3, 9, 25, 9, 25, 6434 },
53 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
54 18800, 0x82, 0x00, 2,
55 2, 6, 3, 10, 26, 10, 26, 9650 },
56 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
57 25000, 0x83, 0x00, 3,
58 4, 10, 3, 11, 27, 11, 27, 12868 },
59 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
60 36700, 0x84, 0x00, 4,
61 4, 14, 3, 12, 28, 12, 28, 19304 },
62 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
63 48100, 0x85, 0x00, 5,
64 4, 20, 3, 13, 29, 13, 29, 25740 },
65 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
66 53500, 0x86, 0x00, 6,
67 4, 23, 3, 14, 30, 14, 30, 28956 },
68 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
69 59000, 0x87, 0x00, 7,
70 4, 25, 3, 15, 31, 15, 32, 32180 },
71 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
72 12700, 0x88, 0x00,
73 8, 0, 2, 3, 16, 33, 16, 33, 6430 },
74 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
75 24800, 0x89, 0x00, 9,
76 2, 4, 3, 17, 34, 17, 34, 12860 },
77 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
78 36600, 0x8a, 0x00, 10,
79 2, 6, 3, 18, 35, 18, 35, 19300 },
80 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
81 48100, 0x8b, 0x00, 11,
82 4, 10, 3, 19, 36, 19, 36, 25736 },
83 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
84 69500, 0x8c, 0x00, 12,
85 4, 14, 3, 20, 37, 20, 37, 38600 },
86 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
87 89500, 0x8d, 0x00, 13,
88 4, 20, 3, 21, 38, 21, 38, 51472 },
89 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
90 98900, 0x8e, 0x00, 14,
91 4, 23, 3, 22, 39, 22, 39, 57890 },
92 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
93 108300, 0x8f, 0x00, 15,
94 4, 25, 3, 23, 40, 23, 41, 64320 },
95 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
96 13200, 0x80, 0x00, 0,
97 0, 2, 3, 8, 24, 24, 24, 6684 },
98 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
99 25900, 0x81, 0x00, 1,
100 2, 4, 3, 9, 25, 25, 25, 13368 },
101 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
102 38600, 0x82, 0x00, 2,
103 2, 6, 3, 10, 26, 26, 26, 20052 },
104 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
105 49800, 0x83, 0x00, 3,
106 4, 10, 3, 11, 27, 27, 27, 26738 },
107 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
108 72200, 0x84, 0x00, 4,
109 4, 14, 3, 12, 28, 28, 28, 40104 },
110 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
111 92900, 0x85, 0x00, 5,
112 4, 20, 3, 13, 29, 29, 29, 53476 },
113 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
114 102700, 0x86, 0x00, 6,
115 4, 23, 3, 14, 30, 30, 30, 60156 },
116 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
117 112000, 0x87, 0x00, 7,
118 4, 25, 3, 15, 31, 32, 32, 66840 },
119 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
120 122000, 0x87, 0x00, 7,
121 4, 25, 3, 15, 31, 32, 32, 74200 },
122 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
123 25800, 0x88, 0x00, 8,
124 0, 2, 3, 16, 33, 33, 33, 13360 },
125 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
126 49800, 0x89, 0x00, 9,
127 2, 4, 3, 17, 34, 34, 34, 26720 },
128 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
129 71900, 0x8a, 0x00, 10,
130 2, 6, 3, 18, 35, 35, 35, 40080 },
131 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
132 92500, 0x8b, 0x00, 11,
133 4, 10, 3, 19, 36, 36, 36, 53440 },
134 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
135 130300, 0x8c, 0x00, 12,
136 4, 14, 3, 20, 37, 37, 37, 80160 },
137 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
138 162800, 0x8d, 0x00, 13,
139 4, 20, 3, 21, 38, 38, 38, 106880 },
140 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
141 178200, 0x8e, 0x00, 14,
142 4, 23, 3, 22, 39, 39, 39, 120240 },
143 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
144 192100, 0x8f, 0x00, 15,
145 4, 25, 3, 23, 40, 41, 41, 133600 },
146 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
147 207000, 0x8f, 0x00, 15,
148 4, 25, 3, 23, 40, 41, 41, 148400 },
149 },
150 50, /* probe interval */
151 50, /* rssi reduce interval */
152 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
153 };
154
155 /* 4ms frame limit not used for NG mode. The values filled
156 * for HT are the 64K max aggregate limit */
157
158 static const struct ath_rate_table ar5416_11ng_ratetable = {
159 46,
160 {
161 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
162 900, 0x1b, 0x00, 2,
163 0, 0, 1, 0, 0, 0, 0, 0 },
164 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
165 1900, 0x1a, 0x04, 4,
166 1, 1, 1, 1, 1, 1, 1, 0 },
167 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
168 4900, 0x19, 0x04, 11,
169 2, 2, 2, 2, 2, 2, 2, 0 },
170 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
171 8100, 0x18, 0x04, 22,
172 3, 3, 2, 3, 3, 3, 3, 0 },
173 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
174 5400, 0x0b, 0x00, 12,
175 4, 2, 1, 4, 4, 4, 4, 0 },
176 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
177 7800, 0x0f, 0x00, 18,
178 4, 3, 1, 5, 5, 5, 5, 0 },
179 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
180 10100, 0x0a, 0x00, 24,
181 6, 4, 1, 6, 6, 6, 6, 0 },
182 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
183 14100, 0x0e, 0x00, 36,
184 6, 6, 2, 7, 7, 7, 7, 0 },
185 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
186 17700, 0x09, 0x00, 48,
187 8, 10, 3, 8, 8, 8, 8, 0 },
188 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
189 23700, 0x0d, 0x00, 72,
190 8, 14, 3, 9, 9, 9, 9, 0 },
191 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
192 27400, 0x08, 0x00, 96,
193 8, 20, 3, 10, 10, 10, 10, 0 },
194 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
195 30900, 0x0c, 0x00, 108,
196 8, 23, 3, 11, 11, 11, 11, 0 },
197 { INVALID, INVALID, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
198 6400, 0x80, 0x00, 0,
199 4, 2, 3, 12, 28, 12, 28, 3216 },
200 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
201 12700, 0x81, 0x00, 1,
202 6, 4, 3, 13, 29, 13, 29, 6434 },
203 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
204 18800, 0x82, 0x00, 2,
205 6, 6, 3, 14, 30, 14, 30, 9650 },
206 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
207 25000, 0x83, 0x00, 3,
208 8, 10, 3, 15, 31, 15, 31, 12868 },
209 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
210 36700, 0x84, 0x00, 4,
211 8, 14, 3, 16, 32, 16, 32, 19304 },
212 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
213 48100, 0x85, 0x00, 5,
214 8, 20, 3, 17, 33, 17, 33, 25740 },
215 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
216 53500, 0x86, 0x00, 6,
217 8, 23, 3, 18, 34, 18, 34, 28956 },
218 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
219 59000, 0x87, 0x00, 7,
220 8, 25, 3, 19, 35, 19, 36, 32180 },
221 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
222 12700, 0x88, 0x00, 8,
223 4, 2, 3, 20, 37, 20, 37, 6430 },
224 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
225 24800, 0x89, 0x00, 9,
226 6, 4, 3, 21, 38, 21, 38, 12860 },
227 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
228 36600, 0x8a, 0x00, 10,
229 6, 6, 3, 22, 39, 22, 39, 19300 },
230 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
231 48100, 0x8b, 0x00, 11,
232 8, 10, 3, 23, 40, 23, 40, 25736 },
233 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
234 69500, 0x8c, 0x00, 12,
235 8, 14, 3, 24, 41, 24, 41, 38600 },
236 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
237 89500, 0x8d, 0x00, 13,
238 8, 20, 3, 25, 42, 25, 42, 51472 },
239 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
240 98900, 0x8e, 0x00, 14,
241 8, 23, 3, 26, 43, 26, 44, 57890 },
242 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
243 108300, 0x8f, 0x00, 15,
244 8, 25, 3, 27, 44, 27, 45, 64320 },
245 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
246 13200, 0x80, 0x00, 0,
247 8, 2, 3, 12, 28, 28, 28, 6684 },
248 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
249 25900, 0x81, 0x00, 1,
250 8, 4, 3, 13, 29, 29, 29, 13368 },
251 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
252 38600, 0x82, 0x00, 2,
253 8, 6, 3, 14, 30, 30, 30, 20052 },
254 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
255 49800, 0x83, 0x00, 3,
256 8, 10, 3, 15, 31, 31, 31, 26738 },
257 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
258 72200, 0x84, 0x00, 4,
259 8, 14, 3, 16, 32, 32, 32, 40104 },
260 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
261 92900, 0x85, 0x00, 5,
262 8, 20, 3, 17, 33, 33, 33, 53476 },
263 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
264 102700, 0x86, 0x00, 6,
265 8, 23, 3, 18, 34, 34, 34, 60156 },
266 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
267 112000, 0x87, 0x00, 7,
268 8, 23, 3, 19, 35, 36, 36, 66840 },
269 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
270 122000, 0x87, 0x00, 7,
271 8, 25, 3, 19, 35, 36, 36, 74200 },
272 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
273 25800, 0x88, 0x00, 8,
274 8, 2, 3, 20, 37, 37, 37, 13360 },
275 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
276 49800, 0x89, 0x00, 9,
277 8, 4, 3, 21, 38, 38, 38, 26720 },
278 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
279 71900, 0x8a, 0x00, 10,
280 8, 6, 3, 22, 39, 39, 39, 40080 },
281 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
282 92500, 0x8b, 0x00, 11,
283 8, 10, 3, 23, 40, 40, 40, 53440 },
284 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
285 130300, 0x8c, 0x00, 12,
286 8, 14, 3, 24, 41, 41, 41, 80160 },
287 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
288 162800, 0x8d, 0x00, 13,
289 8, 20, 3, 25, 42, 42, 42, 106880 },
290 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
291 178200, 0x8e, 0x00, 14,
292 8, 23, 3, 26, 43, 43, 43, 120240 },
293 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
294 192100, 0x8f, 0x00, 15,
295 8, 23, 3, 27, 44, 45, 45, 133600 },
296 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
297 207000, 0x8f, 0x00, 15,
298 8, 25, 3, 27, 44, 45, 45, 148400 },
299 },
300 50, /* probe interval */
301 50, /* rssi reduce interval */
302 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
303 };
304
305 static const struct ath_rate_table ar5416_11a_ratetable = {
306 8,
307 {
308 { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
309 5400, 0x0b, 0x00, (0x80|12),
310 0, 2, 1, 0, 0 },
311 { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
312 7800, 0x0f, 0x00, 18,
313 0, 3, 1, 1, 0 },
314 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
315 10000, 0x0a, 0x00, (0x80|24),
316 2, 4, 2, 2, 0 },
317 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
318 13900, 0x0e, 0x00, 36,
319 2, 6, 2, 3, 0 },
320 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
321 17300, 0x09, 0x00, (0x80|48),
322 4, 10, 3, 4, 0 },
323 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
324 23000, 0x0d, 0x00, 72,
325 4, 14, 3, 5, 0 },
326 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
327 27400, 0x08, 0x00, 96,
328 4, 19, 3, 6, 0 },
329 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
330 29300, 0x0c, 0x00, 108,
331 4, 23, 3, 7, 0 },
332 },
333 50, /* probe interval */
334 50, /* rssi reduce interval */
335 0, /* Phy rates allowed initially */
336 };
337
338 static const struct ath_rate_table ar5416_11g_ratetable = {
339 12,
340 {
341 { VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
342 900, 0x1b, 0x00, 2,
343 0, 0, 1, 0, 0 },
344 { VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
345 1900, 0x1a, 0x04, 4,
346 1, 1, 1, 1, 0 },
347 { VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
348 4900, 0x19, 0x04, 11,
349 2, 2, 2, 2, 0 },
350 { VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
351 8100, 0x18, 0x04, 22,
352 3, 3, 2, 3, 0 },
353 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
354 5400, 0x0b, 0x00, 12,
355 4, 2, 1, 4, 0 },
356 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
357 7800, 0x0f, 0x00, 18,
358 4, 3, 1, 5, 0 },
359 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
360 10000, 0x0a, 0x00, 24,
361 6, 4, 1, 6, 0 },
362 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
363 13900, 0x0e, 0x00, 36,
364 6, 6, 2, 7, 0 },
365 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
366 17300, 0x09, 0x00, 48,
367 8, 10, 3, 8, 0 },
368 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
369 23000, 0x0d, 0x00, 72,
370 8, 14, 3, 9, 0 },
371 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
372 27400, 0x08, 0x00, 96,
373 8, 19, 3, 10, 0 },
374 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
375 29300, 0x0c, 0x00, 108,
376 8, 23, 3, 11, 0 },
377 },
378 50, /* probe interval */
379 50, /* rssi reduce interval */
380 0, /* Phy rates allowed initially */
381 };
382
383 static const struct ath_rate_table ar5416_11b_ratetable = {
384 4,
385 {
386 { VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
387 900, 0x1b, 0x00, (0x80|2),
388 0, 0, 1, 0, 0 },
389 { VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
390 1800, 0x1a, 0x04, (0x80|4),
391 1, 1, 1, 1, 0 },
392 { VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
393 4300, 0x19, 0x04, (0x80|11),
394 1, 2, 2, 2, 0 },
395 { VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
396 7100, 0x18, 0x04, (0x80|22),
397 1, 4, 100, 3, 0 },
398 },
399 100, /* probe interval */
400 100, /* rssi reduce interval */
401 0, /* Phy rates allowed initially */
402 };
403
404 static inline int8_t median(int8_t a, int8_t b, int8_t c)
405 {
406 if (a >= b) {
407 if (b >= c)
408 return b;
409 else if (a > c)
410 return c;
411 else
412 return a;
413 } else {
414 if (a >= c)
415 return a;
416 else if (b >= c)
417 return c;
418 else
419 return b;
420 }
421 }
422
423 static void ath_rc_sort_validrates(const struct ath_rate_table *rate_table,
424 struct ath_rate_priv *ath_rc_priv)
425 {
426 u8 i, j, idx, idx_next;
427
428 for (i = ath_rc_priv->max_valid_rate - 1; i > 0; i--) {
429 for (j = 0; j <= i-1; j++) {
430 idx = ath_rc_priv->valid_rate_index[j];
431 idx_next = ath_rc_priv->valid_rate_index[j+1];
432
433 if (rate_table->info[idx].ratekbps >
434 rate_table->info[idx_next].ratekbps) {
435 ath_rc_priv->valid_rate_index[j] = idx_next;
436 ath_rc_priv->valid_rate_index[j+1] = idx;
437 }
438 }
439 }
440 }
441
442 static void ath_rc_init_valid_txmask(struct ath_rate_priv *ath_rc_priv)
443 {
444 u8 i;
445
446 for (i = 0; i < ath_rc_priv->rate_table_size; i++)
447 ath_rc_priv->valid_rate_index[i] = 0;
448 }
449
450 static inline void ath_rc_set_valid_txmask(struct ath_rate_priv *ath_rc_priv,
451 u8 index, int valid_tx_rate)
452 {
453 ASSERT(index <= ath_rc_priv->rate_table_size);
454 ath_rc_priv->valid_rate_index[index] = valid_tx_rate ? 1 : 0;
455 }
456
457 static inline
458 int ath_rc_get_nextvalid_txrate(const struct ath_rate_table *rate_table,
459 struct ath_rate_priv *ath_rc_priv,
460 u8 cur_valid_txrate,
461 u8 *next_idx)
462 {
463 u8 i;
464
465 for (i = 0; i < ath_rc_priv->max_valid_rate - 1; i++) {
466 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
467 *next_idx = ath_rc_priv->valid_rate_index[i+1];
468 return 1;
469 }
470 }
471
472 /* No more valid rates */
473 *next_idx = 0;
474
475 return 0;
476 }
477
478 /* Return true only for single stream */
479
480 static int ath_rc_valid_phyrate(u32 phy, u32 capflag, int ignore_cw)
481 {
482 if (WLAN_RC_PHY_HT(phy) && !(capflag & WLAN_RC_HT_FLAG))
483 return 0;
484 if (WLAN_RC_PHY_DS(phy) && !(capflag & WLAN_RC_DS_FLAG))
485 return 0;
486 if (WLAN_RC_PHY_SGI(phy) && !(capflag & WLAN_RC_SGI_FLAG))
487 return 0;
488 if (!ignore_cw && WLAN_RC_PHY_HT(phy))
489 if (WLAN_RC_PHY_40(phy) && !(capflag & WLAN_RC_40_FLAG))
490 return 0;
491 if (!WLAN_RC_PHY_40(phy) && (capflag & WLAN_RC_40_FLAG))
492 return 0;
493 return 1;
494 }
495
496 static inline int
497 ath_rc_get_lower_rix(const struct ath_rate_table *rate_table,
498 struct ath_rate_priv *ath_rc_priv,
499 u8 cur_valid_txrate, u8 *next_idx)
500 {
501 int8_t i;
502
503 for (i = 1; i < ath_rc_priv->max_valid_rate ; i++) {
504 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
505 *next_idx = ath_rc_priv->valid_rate_index[i-1];
506 return 1;
507 }
508 }
509
510 return 0;
511 }
512
513 static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
514 const struct ath_rate_table *rate_table,
515 u32 capflag)
516 {
517 u8 i, hi = 0;
518 u32 valid;
519
520 for (i = 0; i < rate_table->rate_cnt; i++) {
521 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
522 rate_table->info[i].valid_single_stream :
523 rate_table->info[i].valid);
524 if (valid == 1) {
525 u32 phy = rate_table->info[i].phy;
526 u8 valid_rate_count = 0;
527
528 if (!ath_rc_valid_phyrate(phy, capflag, 0))
529 continue;
530
531 valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];
532
533 ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = i;
534 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
535 ath_rc_set_valid_txmask(ath_rc_priv, i, 1);
536 hi = A_MAX(hi, i);
537 }
538 }
539
540 return hi;
541 }
542
543 static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
544 const struct ath_rate_table *rate_table,
545 struct ath_rateset *rateset,
546 u32 capflag)
547 {
548 u8 i, j, hi = 0;
549
550 /* Use intersection of working rates and valid rates */
551 for (i = 0; i < rateset->rs_nrates; i++) {
552 for (j = 0; j < rate_table->rate_cnt; j++) {
553 u32 phy = rate_table->info[j].phy;
554 u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
555 rate_table->info[j].valid_single_stream :
556 rate_table->info[j].valid);
557 u8 rate = rateset->rs_rates[i];
558 u8 dot11rate = rate_table->info[j].dot11rate;
559
560 /* We allow a rate only if its valid and the
561 * capflag matches one of the validity
562 * (VALID/VALID_20/VALID_40) flags */
563
564 if (((rate & 0x7F) == (dot11rate & 0x7F)) &&
565 ((valid & WLAN_RC_CAP_MODE(capflag)) ==
566 WLAN_RC_CAP_MODE(capflag)) &&
567 !WLAN_RC_PHY_HT(phy)) {
568 u8 valid_rate_count = 0;
569
570 if (!ath_rc_valid_phyrate(phy, capflag, 0))
571 continue;
572
573 valid_rate_count =
574 ath_rc_priv->valid_phy_ratecnt[phy];
575
576 ath_rc_priv->valid_phy_rateidx[phy]
577 [valid_rate_count] = j;
578 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
579 ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
580 hi = A_MAX(hi, j);
581 }
582 }
583 }
584
585 return hi;
586 }
587
588 static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
589 const struct ath_rate_table *rate_table,
590 u8 *mcs_set, u32 capflag)
591 {
592 struct ath_rateset *rateset = (struct ath_rateset *)mcs_set;
593
594 u8 i, j, hi = 0;
595
596 /* Use intersection of working rates and valid rates */
597 for (i = 0; i < rateset->rs_nrates; i++) {
598 for (j = 0; j < rate_table->rate_cnt; j++) {
599 u32 phy = rate_table->info[j].phy;
600 u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
601 rate_table->info[j].valid_single_stream :
602 rate_table->info[j].valid);
603 u8 rate = rateset->rs_rates[i];
604 u8 dot11rate = rate_table->info[j].dot11rate;
605
606 if (((rate & 0x7F) != (dot11rate & 0x7F)) ||
607 !WLAN_RC_PHY_HT(phy) ||
608 !WLAN_RC_PHY_HT_VALID(valid, capflag))
609 continue;
610
611 if (!ath_rc_valid_phyrate(phy, capflag, 0))
612 continue;
613
614 ath_rc_priv->valid_phy_rateidx[phy]
615 [ath_rc_priv->valid_phy_ratecnt[phy]] = j;
616 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
617 ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
618 hi = A_MAX(hi, j);
619 }
620 }
621
622 return hi;
623 }
624
625 static u8 ath_rc_ratefind_ht(struct ath_softc *sc,
626 struct ath_rate_priv *ath_rc_priv,
627 const struct ath_rate_table *rate_table,
628 int *is_probing)
629 {
630 u32 dt, best_thruput, this_thruput, now_msec;
631 u8 rate, next_rate, best_rate, maxindex, minindex;
632 int8_t rssi_last, rssi_reduce = 0, index = 0;
633
634 *is_probing = 0;
635
636 rssi_last = median(ath_rc_priv->rssi_last,
637 ath_rc_priv->rssi_last_prev,
638 ath_rc_priv->rssi_last_prev2);
639
640 /*
641 * Age (reduce) last ack rssi based on how old it is.
642 * The bizarre numbers are so the delta is 160msec,
643 * meaning we divide by 16.
644 * 0msec <= dt <= 25msec: don't derate
645 * 25msec <= dt <= 185msec: derate linearly from 0 to 10dB
646 * 185msec <= dt: derate by 10dB
647 */
648
649 now_msec = jiffies_to_msecs(jiffies);
650 dt = now_msec - ath_rc_priv->rssi_time;
651
652 if (dt >= 185)
653 rssi_reduce = 10;
654 else if (dt >= 25)
655 rssi_reduce = (u8)((dt - 25) >> 4);
656
657 /* Now reduce rssi_last by rssi_reduce */
658 if (rssi_last < rssi_reduce)
659 rssi_last = 0;
660 else
661 rssi_last -= rssi_reduce;
662
663 /*
664 * Now look up the rate in the rssi table and return it.
665 * If no rates match then we return 0 (lowest rate)
666 */
667
668 best_thruput = 0;
669 maxindex = ath_rc_priv->max_valid_rate-1;
670
671 minindex = 0;
672 best_rate = minindex;
673
674 /*
675 * Try the higher rate first. It will reduce memory moving time
676 * if we have very good channel characteristics.
677 */
678 for (index = maxindex; index >= minindex ; index--) {
679 u8 per_thres;
680
681 rate = ath_rc_priv->valid_rate_index[index];
682 if (rate > ath_rc_priv->rate_max_phy)
683 continue;
684
685 /*
686 * For TCP the average collision rate is around 11%,
687 * so we ignore PERs less than this. This is to
688 * prevent the rate we are currently using (whose
689 * PER might be in the 10-15 range because of TCP
690 * collisions) looking worse than the next lower
691 * rate whose PER has decayed close to 0. If we
692 * used to next lower rate, its PER would grow to
693 * 10-15 and we would be worse off then staying
694 * at the current rate.
695 */
696 per_thres = ath_rc_priv->state[rate].per;
697 if (per_thres < 12)
698 per_thres = 12;
699
700 this_thruput = rate_table->info[rate].user_ratekbps *
701 (100 - per_thres);
702
703 if (best_thruput <= this_thruput) {
704 best_thruput = this_thruput;
705 best_rate = rate;
706 }
707 }
708
709 rate = best_rate;
710 ath_rc_priv->rssi_last_lookup = rssi_last;
711
712 /*
713 * Must check the actual rate (ratekbps) to account for
714 * non-monoticity of 11g's rate table
715 */
716
717 if (rate >= ath_rc_priv->rate_max_phy) {
718 rate = ath_rc_priv->rate_max_phy;
719
720 /* Probe the next allowed phy state */
721 if (ath_rc_get_nextvalid_txrate(rate_table,
722 ath_rc_priv, rate, &next_rate) &&
723 (now_msec - ath_rc_priv->probe_time >
724 rate_table->probe_interval) &&
725 (ath_rc_priv->hw_maxretry_pktcnt >= 1)) {
726 rate = next_rate;
727 ath_rc_priv->probe_rate = rate;
728 ath_rc_priv->probe_time = now_msec;
729 ath_rc_priv->hw_maxretry_pktcnt = 0;
730 *is_probing = 1;
731 }
732 }
733
734 if (rate > (ath_rc_priv->rate_table_size - 1))
735 rate = ath_rc_priv->rate_table_size - 1;
736
737 if (rate_table->info[rate].valid &&
738 (ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
739 return rate;
740
741 if (rate_table->info[rate].valid_single_stream &&
742 !(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG));
743 return rate;
744
745 /* This should not happen */
746 WARN_ON(1);
747
748 rate = ath_rc_priv->valid_rate_index[0];
749
750 return rate;
751 }
752
753 static void ath_rc_rate_set_series(const struct ath_rate_table *rate_table,
754 struct ieee80211_tx_rate *rate,
755 struct ieee80211_tx_rate_control *txrc,
756 u8 tries, u8 rix, int rtsctsenable)
757 {
758 rate->count = tries;
759 rate->idx = rix;
760
761 if (txrc->short_preamble)
762 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
763 if (txrc->rts || rtsctsenable)
764 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
765 if (WLAN_RC_PHY_40(rate_table->info[rix].phy))
766 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
767 if (WLAN_RC_PHY_SGI(rate_table->info[rix].phy))
768 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
769 if (WLAN_RC_PHY_HT(rate_table->info[rix].phy))
770 rate->flags |= IEEE80211_TX_RC_MCS;
771 }
772
773 static void ath_rc_rate_set_rtscts(struct ath_softc *sc,
774 const struct ath_rate_table *rate_table,
775 struct ieee80211_tx_info *tx_info)
776 {
777 struct ieee80211_tx_rate *rates = tx_info->control.rates;
778 int i = 0, rix = 0, cix, enable_g_protection = 0;
779
780 /* get the cix for the lowest valid rix */
781 for (i = 3; i >= 0; i--) {
782 if (rates[i].count && (rates[i].idx >= 0)) {
783 rix = rates[i].idx;
784 break;
785 }
786 }
787 cix = rate_table->info[rix].ctrl_rate;
788
789 /* All protection frames are transmited at 2Mb/s for 802.11g,
790 * otherwise we transmit them at 1Mb/s */
791 if (sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ &&
792 !conf_is_ht(&sc->hw->conf))
793 enable_g_protection = 1;
794
795 /*
796 * If 802.11g protection is enabled, determine whether to use RTS/CTS or
797 * just CTS. Note that this is only done for OFDM/HT unicast frames.
798 */
799 if ((sc->sc_flags & SC_OP_PROTECT_ENABLE) &&
800 !(tx_info->flags & IEEE80211_TX_CTL_NO_ACK) &&
801 (rate_table->info[rix].phy == WLAN_RC_PHY_OFDM ||
802 WLAN_RC_PHY_HT(rate_table->info[rix].phy))) {
803 rates[0].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
804 cix = rate_table->info[enable_g_protection].ctrl_rate;
805 }
806
807 tx_info->control.rts_cts_rate_idx = cix;
808 }
809
810 static void ath_rc_ratefind(struct ath_softc *sc,
811 struct ath_rate_priv *ath_rc_priv,
812 struct ieee80211_tx_rate_control *txrc)
813 {
814 const struct ath_rate_table *rate_table;
815 struct sk_buff *skb = txrc->skb;
816 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
817 struct ieee80211_tx_rate *rates = tx_info->control.rates;
818 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
819 __le16 fc = hdr->frame_control;
820 u8 try_per_rate, i = 0, rix, nrix;
821 int is_probe = 0;
822
823 /*
824 * For Multi Rate Retry we use a different number of
825 * retry attempt counts. This ends up looking like this:
826 *
827 * MRR[0] = 2
828 * MRR[1] = 2
829 * MRR[2] = 2
830 * MRR[3] = 4
831 *
832 */
833 try_per_rate = sc->hw->max_rate_tries;
834
835 rate_table = sc->cur_rate_table;
836 rix = ath_rc_ratefind_ht(sc, ath_rc_priv, rate_table, &is_probe);
837 nrix = rix;
838
839 if (is_probe) {
840 /* set one try for probe rates. For the
841 * probes don't enable rts */
842 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
843 1, nrix, 0);
844
845 /* Get the next tried/allowed rate. No RTS for the next series
846 * after the probe rate
847 */
848 ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &nrix);
849 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
850 try_per_rate, nrix, 0);
851
852 tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
853 } else {
854 /* Set the choosen rate. No RTS for first series entry. */
855 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
856 try_per_rate, nrix, 0);
857 }
858
859 /* Fill in the other rates for multirate retry */
860 for ( ; i < 4; i++) {
861 /* Use twice the number of tries for the last MRR segment. */
862 if (i + 1 == 4)
863 try_per_rate = 4;
864
865 ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &nrix);
866 /* All other rates in the series have RTS enabled */
867 ath_rc_rate_set_series(rate_table, &rates[i], txrc,
868 try_per_rate, nrix, 1);
869 }
870
871 /*
872 * NB:Change rate series to enable aggregation when operating
873 * at lower MCS rates. When first rate in series is MCS2
874 * in HT40 @ 2.4GHz, series should look like:
875 *
876 * {MCS2, MCS1, MCS0, MCS0}.
877 *
878 * When first rate in series is MCS3 in HT20 @ 2.4GHz, series should
879 * look like:
880 *
881 * {MCS3, MCS2, MCS1, MCS1}
882 *
883 * So, set fourth rate in series to be same as third one for
884 * above conditions.
885 */
886 if ((sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ) &&
887 (conf_is_ht(&sc->hw->conf))) {
888 u8 dot11rate = rate_table->info[rix].dot11rate;
889 u8 phy = rate_table->info[rix].phy;
890 if (i == 4 &&
891 ((dot11rate == 2 && phy == WLAN_RC_PHY_HT_40_SS) ||
892 (dot11rate == 3 && phy == WLAN_RC_PHY_HT_20_SS))) {
893 rates[3].idx = rates[2].idx;
894 rates[3].flags = rates[2].flags;
895 }
896 }
897
898 /*
899 * Force hardware to use computed duration for next
900 * fragment by disabling multi-rate retry, which
901 * updates duration based on the multi-rate duration table.
902 *
903 * FIXME: Fix duration
904 */
905 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK) &&
906 (ieee80211_has_morefrags(fc) ||
907 (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG))) {
908 rates[1].count = rates[2].count = rates[3].count = 0;
909 rates[1].idx = rates[2].idx = rates[3].idx = 0;
910 rates[0].count = ATH_TXMAXTRY;
911 }
912
913 /* Setup RTS/CTS */
914 ath_rc_rate_set_rtscts(sc, rate_table, tx_info);
915 }
916
917 static bool ath_rc_update_per(struct ath_softc *sc,
918 const struct ath_rate_table *rate_table,
919 struct ath_rate_priv *ath_rc_priv,
920 struct ath_tx_info_priv *tx_info_priv,
921 int tx_rate, int xretries, int retries,
922 u32 now_msec)
923 {
924 bool state_change = false;
925 int count;
926 u8 last_per;
927 static u32 nretry_to_per_lookup[10] = {
928 100 * 0 / 1,
929 100 * 1 / 4,
930 100 * 1 / 2,
931 100 * 3 / 4,
932 100 * 4 / 5,
933 100 * 5 / 6,
934 100 * 6 / 7,
935 100 * 7 / 8,
936 100 * 8 / 9,
937 100 * 9 / 10
938 };
939
940 last_per = ath_rc_priv->state[tx_rate].per;
941
942 if (xretries) {
943 if (xretries == 1) {
944 ath_rc_priv->state[tx_rate].per += 30;
945 if (ath_rc_priv->state[tx_rate].per > 100)
946 ath_rc_priv->state[tx_rate].per = 100;
947 } else {
948 /* xretries == 2 */
949 count = ARRAY_SIZE(nretry_to_per_lookup);
950 if (retries >= count)
951 retries = count - 1;
952
953 /* new_PER = 7/8*old_PER + 1/8*(currentPER) */
954 ath_rc_priv->state[tx_rate].per =
955 (u8)(last_per - (last_per >> 3) + (100 >> 3));
956 }
957
958 /* xretries == 1 or 2 */
959
960 if (ath_rc_priv->probe_rate == tx_rate)
961 ath_rc_priv->probe_rate = 0;
962
963 } else { /* xretries == 0 */
964 count = ARRAY_SIZE(nretry_to_per_lookup);
965 if (retries >= count)
966 retries = count - 1;
967
968 if (tx_info_priv->n_bad_frames) {
969 /* new_PER = 7/8*old_PER + 1/8*(currentPER)
970 * Assuming that n_frames is not 0. The current PER
971 * from the retries is 100 * retries / (retries+1),
972 * since the first retries attempts failed, and the
973 * next one worked. For the one that worked,
974 * n_bad_frames subframes out of n_frames wored,
975 * so the PER for that part is
976 * 100 * n_bad_frames / n_frames, and it contributes
977 * 100 * n_bad_frames / (n_frames * (retries+1)) to
978 * the above PER. The expression below is a
979 * simplified version of the sum of these two terms.
980 */
981 if (tx_info_priv->n_frames > 0) {
982 int n_frames, n_bad_frames;
983 u8 cur_per, new_per;
984
985 n_bad_frames = retries * tx_info_priv->n_frames +
986 tx_info_priv->n_bad_frames;
987 n_frames = tx_info_priv->n_frames * (retries + 1);
988 cur_per = (100 * n_bad_frames / n_frames) >> 3;
989 new_per = (u8)(last_per - (last_per >> 3) + cur_per);
990 ath_rc_priv->state[tx_rate].per = new_per;
991 }
992 } else {
993 ath_rc_priv->state[tx_rate].per =
994 (u8)(last_per - (last_per >> 3) +
995 (nretry_to_per_lookup[retries] >> 3));
996 }
997
998 ath_rc_priv->rssi_last_prev2 = ath_rc_priv->rssi_last_prev;
999 ath_rc_priv->rssi_last_prev = ath_rc_priv->rssi_last;
1000 ath_rc_priv->rssi_last = tx_info_priv->tx.ts_rssi;
1001 ath_rc_priv->rssi_time = now_msec;
1002
1003 /*
1004 * If we got at most one retry then increase the max rate if
1005 * this was a probe. Otherwise, ignore the probe.
1006 */
1007 if (ath_rc_priv->probe_rate && ath_rc_priv->probe_rate == tx_rate) {
1008 if (retries > 0 || 2 * tx_info_priv->n_bad_frames >
1009 tx_info_priv->n_frames) {
1010 /*
1011 * Since we probed with just a single attempt,
1012 * any retries means the probe failed. Also,
1013 * if the attempt worked, but more than half
1014 * the subframes were bad then also consider
1015 * the probe a failure.
1016 */
1017 ath_rc_priv->probe_rate = 0;
1018 } else {
1019 u8 probe_rate = 0;
1020
1021 ath_rc_priv->rate_max_phy =
1022 ath_rc_priv->probe_rate;
1023 probe_rate = ath_rc_priv->probe_rate;
1024
1025 if (ath_rc_priv->state[probe_rate].per > 30)
1026 ath_rc_priv->state[probe_rate].per = 20;
1027
1028 ath_rc_priv->probe_rate = 0;
1029
1030 /*
1031 * Since this probe succeeded, we allow the next
1032 * probe twice as soon. This allows the maxRate
1033 * to move up faster if the probes are
1034 * succesful.
1035 */
1036 ath_rc_priv->probe_time =
1037 now_msec - rate_table->probe_interval / 2;
1038 }
1039 }
1040
1041 if (retries > 0) {
1042 /*
1043 * Don't update anything. We don't know if
1044 * this was because of collisions or poor signal.
1045 *
1046 * Later: if rssi_ack is close to
1047 * ath_rc_priv->state[txRate].rssi_thres and we see lots
1048 * of retries, then we could increase
1049 * ath_rc_priv->state[txRate].rssi_thres.
1050 */
1051 ath_rc_priv->hw_maxretry_pktcnt = 0;
1052 } else {
1053 int32_t rssi_ackAvg;
1054 int8_t rssi_thres;
1055 int8_t rssi_ack_vmin;
1056
1057 /*
1058 * It worked with no retries. First ignore bogus (small)
1059 * rssi_ack values.
1060 */
1061 if (tx_rate == ath_rc_priv->rate_max_phy &&
1062 ath_rc_priv->hw_maxretry_pktcnt < 255) {
1063 ath_rc_priv->hw_maxretry_pktcnt++;
1064 }
1065
1066 if (tx_info_priv->tx.ts_rssi <
1067 rate_table->info[tx_rate].rssi_ack_validmin)
1068 goto exit;
1069
1070 /* Average the rssi */
1071 if (tx_rate != ath_rc_priv->rssi_sum_rate) {
1072 ath_rc_priv->rssi_sum_rate = tx_rate;
1073 ath_rc_priv->rssi_sum =
1074 ath_rc_priv->rssi_sum_cnt = 0;
1075 }
1076
1077 ath_rc_priv->rssi_sum += tx_info_priv->tx.ts_rssi;
1078 ath_rc_priv->rssi_sum_cnt++;
1079
1080 if (ath_rc_priv->rssi_sum_cnt < 4)
1081 goto exit;
1082
1083 rssi_ackAvg =
1084 (ath_rc_priv->rssi_sum + 2) / 4;
1085 rssi_thres =
1086 ath_rc_priv->state[tx_rate].rssi_thres;
1087 rssi_ack_vmin =
1088 rate_table->info[tx_rate].rssi_ack_validmin;
1089
1090 ath_rc_priv->rssi_sum =
1091 ath_rc_priv->rssi_sum_cnt = 0;
1092
1093 /* Now reduce the current rssi threshold */
1094 if ((rssi_ackAvg < rssi_thres + 2) &&
1095 (rssi_thres > rssi_ack_vmin)) {
1096 ath_rc_priv->state[tx_rate].rssi_thres--;
1097 }
1098
1099 state_change = true;
1100 }
1101 }
1102 exit:
1103 return state_change;
1104 }
1105
1106 /* Update PER, RSSI and whatever else that the code thinks it is doing.
1107 If you can make sense of all this, you really need to go out more. */
1108
1109 static void ath_rc_update_ht(struct ath_softc *sc,
1110 struct ath_rate_priv *ath_rc_priv,
1111 struct ath_tx_info_priv *tx_info_priv,
1112 int tx_rate, int xretries, int retries)
1113 {
1114 #define CHK_RSSI(rate) \
1115 ((ath_rc_priv->state[(rate)].rssi_thres + \
1116 rate_table->info[(rate)].rssi_ack_deltamin) > \
1117 ath_rc_priv->state[(rate)+1].rssi_thres)
1118
1119 u32 now_msec = jiffies_to_msecs(jiffies);
1120 int rate;
1121 u8 last_per;
1122 bool state_change = false;
1123 const struct ath_rate_table *rate_table = sc->cur_rate_table;
1124 int size = ath_rc_priv->rate_table_size;
1125
1126 if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
1127 return;
1128
1129 /* To compensate for some imbalance between ctrl and ext. channel */
1130
1131 if (WLAN_RC_PHY_40(rate_table->info[tx_rate].phy))
1132 tx_info_priv->tx.ts_rssi =
1133 tx_info_priv->tx.ts_rssi < 3 ? 0 :
1134 tx_info_priv->tx.ts_rssi - 3;
1135
1136 last_per = ath_rc_priv->state[tx_rate].per;
1137
1138 /* Update PER first */
1139 state_change = ath_rc_update_per(sc, rate_table, ath_rc_priv,
1140 tx_info_priv, tx_rate, xretries,
1141 retries, now_msec);
1142
1143 /*
1144 * If this rate looks bad (high PER) then stop using it for
1145 * a while (except if we are probing).
1146 */
1147 if (ath_rc_priv->state[tx_rate].per >= 55 && tx_rate > 0 &&
1148 rate_table->info[tx_rate].ratekbps <=
1149 rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
1150 ath_rc_get_lower_rix(rate_table, ath_rc_priv,
1151 (u8)tx_rate, &ath_rc_priv->rate_max_phy);
1152
1153 /* Don't probe for a little while. */
1154 ath_rc_priv->probe_time = now_msec;
1155 }
1156
1157 if (state_change) {
1158 /*
1159 * Make sure the rates above this have higher rssi thresholds.
1160 * (Note: Monotonicity is kept within the OFDM rates and
1161 * within the CCK rates. However, no adjustment is
1162 * made to keep the rssi thresholds monotonically
1163 * increasing between the CCK and OFDM rates.)
1164 */
1165 for (rate = tx_rate; rate < size - 1; rate++) {
1166 if (rate_table->info[rate+1].phy !=
1167 rate_table->info[tx_rate].phy)
1168 break;
1169
1170 if (CHK_RSSI(rate)) {
1171 ath_rc_priv->state[rate+1].rssi_thres =
1172 ath_rc_priv->state[rate].rssi_thres +
1173 rate_table->info[rate].rssi_ack_deltamin;
1174 }
1175 }
1176
1177 /* Make sure the rates below this have lower rssi thresholds. */
1178 for (rate = tx_rate - 1; rate >= 0; rate--) {
1179 if (rate_table->info[rate].phy !=
1180 rate_table->info[tx_rate].phy)
1181 break;
1182
1183 if (CHK_RSSI(rate)) {
1184 if (ath_rc_priv->state[rate+1].rssi_thres <
1185 rate_table->info[rate].rssi_ack_deltamin)
1186 ath_rc_priv->state[rate].rssi_thres = 0;
1187 else {
1188 ath_rc_priv->state[rate].rssi_thres =
1189 ath_rc_priv->state[rate+1].rssi_thres -
1190 rate_table->info[rate].rssi_ack_deltamin;
1191 }
1192
1193 if (ath_rc_priv->state[rate].rssi_thres <
1194 rate_table->info[rate].rssi_ack_validmin) {
1195 ath_rc_priv->state[rate].rssi_thres =
1196 rate_table->info[rate].rssi_ack_validmin;
1197 }
1198 }
1199 }
1200 }
1201
1202 /* Make sure the rates below this have lower PER */
1203 /* Monotonicity is kept only for rates below the current rate. */
1204 if (ath_rc_priv->state[tx_rate].per < last_per) {
1205 for (rate = tx_rate - 1; rate >= 0; rate--) {
1206 if (rate_table->info[rate].phy !=
1207 rate_table->info[tx_rate].phy)
1208 break;
1209
1210 if (ath_rc_priv->state[rate].per >
1211 ath_rc_priv->state[rate+1].per) {
1212 ath_rc_priv->state[rate].per =
1213 ath_rc_priv->state[rate+1].per;
1214 }
1215 }
1216 }
1217
1218 /* Maintain monotonicity for rates above the current rate */
1219 for (rate = tx_rate; rate < size - 1; rate++) {
1220 if (ath_rc_priv->state[rate+1].per <
1221 ath_rc_priv->state[rate].per)
1222 ath_rc_priv->state[rate+1].per =
1223 ath_rc_priv->state[rate].per;
1224 }
1225
1226 /* Every so often, we reduce the thresholds and
1227 * PER (different for CCK and OFDM). */
1228 if (now_msec - ath_rc_priv->rssi_down_time >=
1229 rate_table->rssi_reduce_interval) {
1230
1231 for (rate = 0; rate < size; rate++) {
1232 if (ath_rc_priv->state[rate].rssi_thres >
1233 rate_table->info[rate].rssi_ack_validmin)
1234 ath_rc_priv->state[rate].rssi_thres -= 1;
1235 }
1236 ath_rc_priv->rssi_down_time = now_msec;
1237 }
1238
1239 /* Every so often, we reduce the thresholds
1240 * and PER (different for CCK and OFDM). */
1241 if (now_msec - ath_rc_priv->per_down_time >=
1242 rate_table->rssi_reduce_interval) {
1243 for (rate = 0; rate < size; rate++) {
1244 ath_rc_priv->state[rate].per =
1245 7 * ath_rc_priv->state[rate].per / 8;
1246 }
1247
1248 ath_rc_priv->per_down_time = now_msec;
1249 }
1250
1251 ath_debug_stat_retries(sc, tx_rate, xretries, retries,
1252 ath_rc_priv->state[tx_rate].per);
1253
1254 #undef CHK_RSSI
1255 }
1256
1257 static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
1258 struct ieee80211_tx_rate *rate)
1259 {
1260 int rix;
1261
1262 if ((rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1263 (rate->flags & IEEE80211_TX_RC_SHORT_GI))
1264 rix = rate_table->info[rate->idx].ht_index;
1265 else if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
1266 rix = rate_table->info[rate->idx].sgi_index;
1267 else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1268 rix = rate_table->info[rate->idx].cw40index;
1269 else
1270 rix = rate_table->info[rate->idx].base_index;
1271
1272 return rix;
1273 }
1274
1275 static void ath_rc_tx_status(struct ath_softc *sc,
1276 struct ath_rate_priv *ath_rc_priv,
1277 struct ieee80211_tx_info *tx_info,
1278 int final_ts_idx, int xretries, int long_retry)
1279 {
1280 struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
1281 const struct ath_rate_table *rate_table;
1282 struct ieee80211_tx_rate *rates = tx_info->status.rates;
1283 u8 flags;
1284 u32 i = 0, rix;
1285
1286 rate_table = sc->cur_rate_table;
1287
1288 /*
1289 * If the first rate is not the final index, there
1290 * are intermediate rate failures to be processed.
1291 */
1292 if (final_ts_idx != 0) {
1293 /* Process intermediate rates that failed.*/
1294 for (i = 0; i < final_ts_idx ; i++) {
1295 if (rates[i].count != 0 && (rates[i].idx >= 0)) {
1296 flags = rates[i].flags;
1297
1298 /* If HT40 and we have switched mode from
1299 * 40 to 20 => don't update */
1300
1301 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1302 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
1303 return;
1304
1305 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
1306 ath_rc_update_ht(sc, ath_rc_priv,
1307 tx_info_priv, rix,
1308 xretries ? 1 : 2,
1309 rates[i].count);
1310 }
1311 }
1312 } else {
1313 /*
1314 * Handle the special case of MIMO PS burst, where the second
1315 * aggregate is sent out with only one rate and one try.
1316 * Treating it as an excessive retry penalizes the rate
1317 * inordinately.
1318 */
1319 if (rates[0].count == 1 && xretries == 1)
1320 xretries = 2;
1321 }
1322
1323 flags = rates[i].flags;
1324
1325 /* If HT40 and we have switched mode from 40 to 20 => don't update */
1326 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1327 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
1328 return;
1329
1330 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
1331 ath_rc_update_ht(sc, ath_rc_priv, tx_info_priv, rix,
1332 xretries, long_retry);
1333 }
1334
1335 static const
1336 struct ath_rate_table *ath_choose_rate_table(struct ath_softc *sc,
1337 enum ieee80211_band band,
1338 bool is_ht,
1339 bool is_cw_40)
1340 {
1341 int mode = 0;
1342
1343 switch(band) {
1344 case IEEE80211_BAND_2GHZ:
1345 mode = ATH9K_MODE_11G;
1346 if (is_ht)
1347 mode = ATH9K_MODE_11NG_HT20;
1348 if (is_cw_40)
1349 mode = ATH9K_MODE_11NG_HT40PLUS;
1350 break;
1351 case IEEE80211_BAND_5GHZ:
1352 mode = ATH9K_MODE_11A;
1353 if (is_ht)
1354 mode = ATH9K_MODE_11NA_HT20;
1355 if (is_cw_40)
1356 mode = ATH9K_MODE_11NA_HT40PLUS;
1357 break;
1358 default:
1359 DPRINTF(sc, ATH_DBG_CONFIG, "Invalid band\n");
1360 return NULL;
1361 }
1362
1363 BUG_ON(mode >= ATH9K_MODE_MAX);
1364
1365 DPRINTF(sc, ATH_DBG_CONFIG, "Choosing rate table for mode: %d\n", mode);
1366 return sc->hw_rate_table[mode];
1367 }
1368
1369 static void ath_rc_init(struct ath_softc *sc,
1370 struct ath_rate_priv *ath_rc_priv,
1371 struct ieee80211_supported_band *sband,
1372 struct ieee80211_sta *sta,
1373 const struct ath_rate_table *rate_table)
1374 {
1375 struct ath_rateset *rateset = &ath_rc_priv->neg_rates;
1376 u8 *ht_mcs = (u8 *)&ath_rc_priv->neg_ht_rates;
1377 u8 i, j, k, hi = 0, hthi = 0;
1378
1379 if (!rate_table) {
1380 DPRINTF(sc, ATH_DBG_FATAL, "Rate table not initialized\n");
1381 return;
1382 }
1383
1384 /* Initial rate table size. Will change depending
1385 * on the working rate set */
1386 ath_rc_priv->rate_table_size = RATE_TABLE_SIZE;
1387
1388 /* Initialize thresholds according to the global rate table */
1389 for (i = 0 ; i < ath_rc_priv->rate_table_size; i++) {
1390 ath_rc_priv->state[i].rssi_thres =
1391 rate_table->info[i].rssi_ack_validmin;
1392 ath_rc_priv->state[i].per = 0;
1393 }
1394
1395 /* Determine the valid rates */
1396 ath_rc_init_valid_txmask(ath_rc_priv);
1397
1398 for (i = 0; i < WLAN_RC_PHY_MAX; i++) {
1399 for (j = 0; j < MAX_TX_RATE_PHY; j++)
1400 ath_rc_priv->valid_phy_rateidx[i][j] = 0;
1401 ath_rc_priv->valid_phy_ratecnt[i] = 0;
1402 }
1403
1404 if (!rateset->rs_nrates) {
1405 /* No working rate, just initialize valid rates */
1406 hi = ath_rc_init_validrates(ath_rc_priv, rate_table,
1407 ath_rc_priv->ht_cap);
1408 } else {
1409 /* Use intersection of working rates and valid rates */
1410 hi = ath_rc_setvalid_rates(ath_rc_priv, rate_table,
1411 rateset, ath_rc_priv->ht_cap);
1412 if (ath_rc_priv->ht_cap & WLAN_RC_HT_FLAG) {
1413 hthi = ath_rc_setvalid_htrates(ath_rc_priv,
1414 rate_table,
1415 ht_mcs,
1416 ath_rc_priv->ht_cap);
1417 }
1418 hi = A_MAX(hi, hthi);
1419 }
1420
1421 ath_rc_priv->rate_table_size = hi + 1;
1422 ath_rc_priv->rate_max_phy = 0;
1423 ASSERT(ath_rc_priv->rate_table_size <= RATE_TABLE_SIZE);
1424
1425 for (i = 0, k = 0; i < WLAN_RC_PHY_MAX; i++) {
1426 for (j = 0; j < ath_rc_priv->valid_phy_ratecnt[i]; j++) {
1427 ath_rc_priv->valid_rate_index[k++] =
1428 ath_rc_priv->valid_phy_rateidx[i][j];
1429 }
1430
1431 if (!ath_rc_valid_phyrate(i, rate_table->initial_ratemax, 1)
1432 || !ath_rc_priv->valid_phy_ratecnt[i])
1433 continue;
1434
1435 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_phy_rateidx[i][j-1];
1436 }
1437 ASSERT(ath_rc_priv->rate_table_size <= RATE_TABLE_SIZE);
1438 ASSERT(k <= RATE_TABLE_SIZE);
1439
1440 ath_rc_priv->max_valid_rate = k;
1441 ath_rc_sort_validrates(rate_table, ath_rc_priv);
1442 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
1443 sc->cur_rate_table = rate_table;
1444
1445 DPRINTF(sc, ATH_DBG_CONFIG, "RC Initialized with capabilities: 0x%x\n",
1446 ath_rc_priv->ht_cap);
1447 }
1448
1449 static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta,
1450 bool is_cw40, bool is_sgi40)
1451 {
1452 u8 caps = 0;
1453
1454 if (sta->ht_cap.ht_supported) {
1455 caps = WLAN_RC_HT_FLAG;
1456 if (sc->sc_ah->caps.tx_chainmask != 1 &&
1457 ath9k_hw_getcapability(sc->sc_ah, ATH9K_CAP_DS, 0, NULL)) {
1458 if (sta->ht_cap.mcs.rx_mask[1])
1459 caps |= WLAN_RC_DS_FLAG;
1460 }
1461 if (is_cw40)
1462 caps |= WLAN_RC_40_FLAG;
1463 if (is_sgi40)
1464 caps |= WLAN_RC_SGI_FLAG;
1465 }
1466
1467 return caps;
1468 }
1469
1470 /***********************************/
1471 /* mac80211 Rate Control callbacks */
1472 /***********************************/
1473
1474 static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
1475 struct ieee80211_sta *sta, void *priv_sta,
1476 struct sk_buff *skb)
1477 {
1478 struct ath_softc *sc = priv;
1479 struct ath_rate_priv *ath_rc_priv = priv_sta;
1480 struct ath_tx_info_priv *tx_info_priv = NULL;
1481 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1482 struct ieee80211_hdr *hdr;
1483 int final_ts_idx, tx_status = 0, is_underrun = 0;
1484 __le16 fc;
1485
1486 hdr = (struct ieee80211_hdr *)skb->data;
1487 fc = hdr->frame_control;
1488 tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
1489 final_ts_idx = tx_info_priv->tx.ts_rateindex;
1490
1491 if (!priv_sta || !ieee80211_is_data(fc) ||
1492 !tx_info_priv->update_rc)
1493 goto exit;
1494
1495 if (tx_info_priv->tx.ts_status & ATH9K_TXERR_FILT)
1496 goto exit;
1497
1498 /*
1499 * If underrun error is seen assume it as an excessive retry only
1500 * if prefetch trigger level have reached the max (0x3f for 5416)
1501 * Adjust the long retry as if the frame was tried hw->max_rate_tries
1502 * times. This affects how ratectrl updates PER for the failed rate.
1503 */
1504 if (tx_info_priv->tx.ts_flags &
1505 (ATH9K_TX_DATA_UNDERRUN | ATH9K_TX_DELIM_UNDERRUN) &&
1506 ((sc->sc_ah->tx_trig_level) >= ath_rc_priv->tx_triglevel_max)) {
1507 tx_status = 1;
1508 is_underrun = 1;
1509 }
1510
1511 if ((tx_info_priv->tx.ts_status & ATH9K_TXERR_XRETRY) ||
1512 (tx_info_priv->tx.ts_status & ATH9K_TXERR_FIFO))
1513 tx_status = 1;
1514
1515 ath_rc_tx_status(sc, ath_rc_priv, tx_info, final_ts_idx, tx_status,
1516 (is_underrun) ? sc->hw->max_rate_tries :
1517 tx_info_priv->tx.ts_longretry);
1518
1519 /* Check if aggregation has to be enabled for this tid */
1520 if (conf_is_ht(&sc->hw->conf) &&
1521 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
1522 if (ieee80211_is_data_qos(fc)) {
1523 u8 *qc, tid;
1524 struct ath_node *an;
1525
1526 qc = ieee80211_get_qos_ctl(hdr);
1527 tid = qc[0] & 0xf;
1528 an = (struct ath_node *)sta->drv_priv;
1529
1530 if(ath_tx_aggr_check(sc, an, tid))
1531 ieee80211_start_tx_ba_session(sc->hw, hdr->addr1, tid);
1532 }
1533 }
1534
1535 ath_debug_stat_rc(sc, skb);
1536 exit:
1537 kfree(tx_info_priv);
1538 }
1539
1540 static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
1541 struct ieee80211_tx_rate_control *txrc)
1542 {
1543 struct ieee80211_supported_band *sband = txrc->sband;
1544 struct sk_buff *skb = txrc->skb;
1545 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1546 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1547 struct ath_softc *sc = priv;
1548 struct ath_rate_priv *ath_rc_priv = priv_sta;
1549 __le16 fc = hdr->frame_control;
1550
1551 /* lowest rate for management and NO_ACK frames */
1552 if (!ieee80211_is_data(fc) ||
1553 tx_info->flags & IEEE80211_TX_CTL_NO_ACK || !sta) {
1554 tx_info->control.rates[0].idx = rate_lowest_index(sband, sta);
1555 tx_info->control.rates[0].count =
1556 (tx_info->flags & IEEE80211_TX_CTL_NO_ACK) ?
1557 1 : ATH_MGT_TXMAXTRY;
1558 return;
1559 }
1560
1561 /* Find tx rate for unicast frames */
1562 ath_rc_ratefind(sc, ath_rc_priv, txrc);
1563 }
1564
1565 static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
1566 struct ieee80211_sta *sta, void *priv_sta)
1567 {
1568 struct ath_softc *sc = priv;
1569 struct ath_rate_priv *ath_rc_priv = priv_sta;
1570 const struct ath_rate_table *rate_table = NULL;
1571 bool is_cw40, is_sgi40;
1572 int i, j = 0;
1573
1574 for (i = 0; i < sband->n_bitrates; i++) {
1575 if (sta->supp_rates[sband->band] & BIT(i)) {
1576 ath_rc_priv->neg_rates.rs_rates[j]
1577 = (sband->bitrates[i].bitrate * 2) / 10;
1578 j++;
1579 }
1580 }
1581 ath_rc_priv->neg_rates.rs_nrates = j;
1582
1583 if (sta->ht_cap.ht_supported) {
1584 for (i = 0, j = 0; i < 77; i++) {
1585 if (sta->ht_cap.mcs.rx_mask[i/8] & (1<<(i%8)))
1586 ath_rc_priv->neg_ht_rates.rs_rates[j++] = i;
1587 if (j == ATH_RATE_MAX)
1588 break;
1589 }
1590 ath_rc_priv->neg_ht_rates.rs_nrates = j;
1591 }
1592
1593 is_cw40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
1594 is_sgi40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
1595
1596 /* Choose rate table first */
1597
1598 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) ||
1599 (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) ||
1600 (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC)) {
1601 rate_table = ath_choose_rate_table(sc, sband->band,
1602 sta->ht_cap.ht_supported,
1603 is_cw40);
1604 } else if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
1605 /* cur_rate_table would be set on init through config() */
1606 rate_table = sc->cur_rate_table;
1607 }
1608
1609 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta, is_cw40, is_sgi40);
1610 ath_rc_init(sc, priv_sta, sband, sta, rate_table);
1611 }
1612
1613 static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
1614 struct ieee80211_sta *sta, void *priv_sta,
1615 u32 changed)
1616 {
1617 struct ath_softc *sc = priv;
1618 struct ath_rate_priv *ath_rc_priv = priv_sta;
1619 const struct ath_rate_table *rate_table = NULL;
1620 bool oper_cw40 = false, oper_sgi40;
1621 bool local_cw40 = (ath_rc_priv->ht_cap & WLAN_RC_40_FLAG) ?
1622 true : false;
1623 bool local_sgi40 = (ath_rc_priv->ht_cap & WLAN_RC_SGI_FLAG) ?
1624 true : false;
1625
1626 /* FIXME: Handle AP mode later when we support CWM */
1627
1628 if (changed & IEEE80211_RC_HT_CHANGED) {
1629 if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
1630 return;
1631
1632 if (sc->hw->conf.channel_type == NL80211_CHAN_HT40MINUS ||
1633 sc->hw->conf.channel_type == NL80211_CHAN_HT40PLUS)
1634 oper_cw40 = true;
1635
1636 oper_sgi40 = (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40) ?
1637 true : false;
1638
1639 if ((local_cw40 != oper_cw40) || (local_sgi40 != oper_sgi40)) {
1640 rate_table = ath_choose_rate_table(sc, sband->band,
1641 sta->ht_cap.ht_supported,
1642 oper_cw40);
1643 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta,
1644 oper_cw40, oper_sgi40);
1645 ath_rc_init(sc, priv_sta, sband, sta, rate_table);
1646
1647 DPRINTF(sc, ATH_DBG_CONFIG,
1648 "Operating HT Bandwidth changed to: %d\n",
1649 sc->hw->conf.channel_type);
1650 }
1651 }
1652 }
1653
1654 static void *ath_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
1655 {
1656 struct ath_wiphy *aphy = hw->priv;
1657 return aphy->sc;
1658 }
1659
1660 static void ath_rate_free(void *priv)
1661 {
1662 return;
1663 }
1664
1665 static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
1666 {
1667 struct ath_softc *sc = priv;
1668 struct ath_rate_priv *rate_priv;
1669
1670 rate_priv = kzalloc(sizeof(struct ath_rate_priv), gfp);
1671 if (!rate_priv) {
1672 DPRINTF(sc, ATH_DBG_FATAL,
1673 "Unable to allocate private rc structure\n");
1674 return NULL;
1675 }
1676
1677 rate_priv->rssi_down_time = jiffies_to_msecs(jiffies);
1678 rate_priv->tx_triglevel_max = sc->sc_ah->caps.tx_triglevel_max;
1679
1680 return rate_priv;
1681 }
1682
1683 static void ath_rate_free_sta(void *priv, struct ieee80211_sta *sta,
1684 void *priv_sta)
1685 {
1686 struct ath_rate_priv *rate_priv = priv_sta;
1687 kfree(rate_priv);
1688 }
1689
1690 static struct rate_control_ops ath_rate_ops = {
1691 .module = NULL,
1692 .name = "ath9k_rate_control",
1693 .tx_status = ath_tx_status,
1694 .get_rate = ath_get_rate,
1695 .rate_init = ath_rate_init,
1696 .rate_update = ath_rate_update,
1697 .alloc = ath_rate_alloc,
1698 .free = ath_rate_free,
1699 .alloc_sta = ath_rate_alloc_sta,
1700 .free_sta = ath_rate_free_sta,
1701 };
1702
1703 void ath_rate_attach(struct ath_softc *sc)
1704 {
1705 sc->hw_rate_table[ATH9K_MODE_11B] =
1706 &ar5416_11b_ratetable;
1707 sc->hw_rate_table[ATH9K_MODE_11A] =
1708 &ar5416_11a_ratetable;
1709 sc->hw_rate_table[ATH9K_MODE_11G] =
1710 &ar5416_11g_ratetable;
1711 sc->hw_rate_table[ATH9K_MODE_11NA_HT20] =
1712 &ar5416_11na_ratetable;
1713 sc->hw_rate_table[ATH9K_MODE_11NG_HT20] =
1714 &ar5416_11ng_ratetable;
1715 sc->hw_rate_table[ATH9K_MODE_11NA_HT40PLUS] =
1716 &ar5416_11na_ratetable;
1717 sc->hw_rate_table[ATH9K_MODE_11NA_HT40MINUS] =
1718 &ar5416_11na_ratetable;
1719 sc->hw_rate_table[ATH9K_MODE_11NG_HT40PLUS] =
1720 &ar5416_11ng_ratetable;
1721 sc->hw_rate_table[ATH9K_MODE_11NG_HT40MINUS] =
1722 &ar5416_11ng_ratetable;
1723 }
1724
1725 int ath_rate_control_register(void)
1726 {
1727 return ieee80211_rate_control_register(&ath_rate_ops);
1728 }
1729
1730 void ath_rate_control_unregister(void)
1731 {
1732 ieee80211_rate_control_unregister(&ath_rate_ops);
1733 }
Linus' kernel tree