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ath9k: Simplify RC alloc/free functions
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / ath9k / rc.c
blob09d622ab313c34e21206cd4c396a535c7568e9f1
1 /*
2 * Copyright (c) 2004 Video54 Technologies, Inc.
3 * Copyright (c) 2004-2008 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 /*
19 * Atheros rate control algorithm
20 */
21
22 #include "core.h"
23 /* FIXME: remove this include! */
24 #include "../net/mac80211/rate.h"
25
26 static u32 tx_triglevel_max;
27
28 static struct ath_rate_table ar5416_11na_ratetable = {
29 42,
30 {
31 { TRUE, TRUE, WLAN_PHY_OFDM, 6000, /* 6 Mb */
32 5400, 0x0b, 0x00, 12,
33 0, 2, 1, 0, 0, 0, 0, 0 },
34 { TRUE, TRUE, WLAN_PHY_OFDM, 9000, /* 9 Mb */
35 7800, 0x0f, 0x00, 18,
36 0, 3, 1, 1, 1, 1, 1, 0 },
37 { TRUE, TRUE, WLAN_PHY_OFDM, 12000, /* 12 Mb */
38 10000, 0x0a, 0x00, 24,
39 2, 4, 2, 2, 2, 2, 2, 0 },
40 { TRUE, TRUE, WLAN_PHY_OFDM, 18000, /* 18 Mb */
41 13900, 0x0e, 0x00, 36,
42 2, 6, 2, 3, 3, 3, 3, 0 },
43 { TRUE, TRUE, WLAN_PHY_OFDM, 24000, /* 24 Mb */
44 17300, 0x09, 0x00, 48,
45 4, 10, 3, 4, 4, 4, 4, 0 },
46 { TRUE, TRUE, WLAN_PHY_OFDM, 36000, /* 36 Mb */
47 23000, 0x0d, 0x00, 72,
48 4, 14, 3, 5, 5, 5, 5, 0 },
49 { TRUE, TRUE, WLAN_PHY_OFDM, 48000, /* 48 Mb */
50 27400, 0x08, 0x00, 96,
51 4, 20, 3, 6, 6, 6, 6, 0 },
52 { TRUE, TRUE, WLAN_PHY_OFDM, 54000, /* 54 Mb */
53 29300, 0x0c, 0x00, 108,
54 4, 23, 3, 7, 7, 7, 7, 0 },
55 { TRUE_20, TRUE_20, WLAN_PHY_HT_20_SS, 6500, /* 6.5 Mb */
56 6400, 0x80, 0x00, 0,
57 0, 2, 3, 8, 24, 8, 24, 3216 },
58 { TRUE_20, TRUE_20, WLAN_PHY_HT_20_SS, 13000, /* 13 Mb */
59 12700, 0x81, 0x00, 1,
60 2, 4, 3, 9, 25, 9, 25, 6434 },
61 { TRUE_20, TRUE_20, WLAN_PHY_HT_20_SS, 19500, /* 19.5 Mb */
62 18800, 0x82, 0x00, 2,
63 2, 6, 3, 10, 26, 10, 26, 9650 },
64 { TRUE_20, TRUE_20, WLAN_PHY_HT_20_SS, 26000, /* 26 Mb */
65 25000, 0x83, 0x00, 3,
66 4, 10, 3, 11, 27, 11, 27, 12868 },
67 { TRUE_20, TRUE_20, WLAN_PHY_HT_20_SS, 39000, /* 39 Mb */
68 36700, 0x84, 0x00, 4,
69 4, 14, 3, 12, 28, 12, 28, 19304 },
70 { FALSE, TRUE_20, WLAN_PHY_HT_20_SS, 52000, /* 52 Mb */
71 48100, 0x85, 0x00, 5,
72 4, 20, 3, 13, 29, 13, 29, 25740 },
73 { FALSE, TRUE_20, WLAN_PHY_HT_20_SS, 58500, /* 58.5 Mb */
74 53500, 0x86, 0x00, 6,
75 4, 23, 3, 14, 30, 14, 30, 28956 },
76 { FALSE, TRUE_20, WLAN_PHY_HT_20_SS, 65000, /* 65 Mb */
77 59000, 0x87, 0x00, 7,
78 4, 25, 3, 15, 31, 15, 32, 32180 },
79 { FALSE, FALSE, WLAN_PHY_HT_20_DS, 13000, /* 13 Mb */
80 12700, 0x88, 0x00,
81 8, 0, 2, 3, 16, 33, 16, 33, 6430 },
82 { FALSE, FALSE, WLAN_PHY_HT_20_DS, 26000, /* 26 Mb */
83 24800, 0x89, 0x00, 9,
84 2, 4, 3, 17, 34, 17, 34, 12860 },
85 { FALSE, FALSE, WLAN_PHY_HT_20_DS, 39000, /* 39 Mb */
86 36600, 0x8a, 0x00, 10,
87 2, 6, 3, 18, 35, 18, 35, 19300 },
88 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 52000, /* 52 Mb */
89 48100, 0x8b, 0x00, 11,
90 4, 10, 3, 19, 36, 19, 36, 25736 },
91 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 78000, /* 78 Mb */
92 69500, 0x8c, 0x00, 12,
93 4, 14, 3, 20, 37, 20, 37, 38600 },
94 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 104000, /* 104 Mb */
95 89500, 0x8d, 0x00, 13,
96 4, 20, 3, 21, 38, 21, 38, 51472 },
97 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 117000, /* 117 Mb */
98 98900, 0x8e, 0x00, 14,
99 4, 23, 3, 22, 39, 22, 39, 57890 },
100 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 130000, /* 130 Mb */
101 108300, 0x8f, 0x00, 15,
102 4, 25, 3, 23, 40, 23, 41, 64320 },
103 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 13500, /* 13.5 Mb */
104 13200, 0x80, 0x00, 0,
105 0, 2, 3, 8, 24, 24, 24, 6684 },
106 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 27500, /* 27.0 Mb */
107 25900, 0x81, 0x00, 1,
108 2, 4, 3, 9, 25, 25, 25, 13368 },
109 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 40500, /* 40.5 Mb */
110 38600, 0x82, 0x00, 2,
111 2, 6, 3, 10, 26, 26, 26, 20052 },
112 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 54000, /* 54 Mb */
113 49800, 0x83, 0x00, 3,
114 4, 10, 3, 11, 27, 27, 27, 26738 },
115 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 81500, /* 81 Mb */
116 72200, 0x84, 0x00, 4,
117 4, 14, 3, 12, 28, 28, 28, 40104 },
118 { FALSE, TRUE_40, WLAN_PHY_HT_40_SS, 108000, /* 108 Mb */
119 92900, 0x85, 0x00, 5,
120 4, 20, 3, 13, 29, 29, 29, 53476 },
121 { FALSE, TRUE_40, WLAN_PHY_HT_40_SS, 121500, /* 121.5 Mb */
122 102700, 0x86, 0x00, 6,
123 4, 23, 3, 14, 30, 30, 30, 60156 },
124 { FALSE, TRUE_40, WLAN_PHY_HT_40_SS, 135000, /* 135 Mb */
125 112000, 0x87, 0x00, 7,
126 4, 25, 3, 15, 31, 32, 32, 66840 },
127 { FALSE, TRUE_40, WLAN_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
128 122000, 0x87, 0x00, 7,
129 4, 25, 3, 15, 31, 32, 32, 74200 },
130 { FALSE, FALSE, WLAN_PHY_HT_40_DS, 27000, /* 27 Mb */
131 25800, 0x88, 0x00, 8,
132 0, 2, 3, 16, 33, 33, 33, 13360 },
133 { FALSE, FALSE, WLAN_PHY_HT_40_DS, 54000, /* 54 Mb */
134 49800, 0x89, 0x00, 9,
135 2, 4, 3, 17, 34, 34, 34, 26720 },
136 { FALSE, FALSE, WLAN_PHY_HT_40_DS, 81000, /* 81 Mb */
137 71900, 0x8a, 0x00, 10,
138 2, 6, 3, 18, 35, 35, 35, 40080 },
139 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 108000, /* 108 Mb */
140 92500, 0x8b, 0x00, 11,
141 4, 10, 3, 19, 36, 36, 36, 53440 },
142 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 162000, /* 162 Mb */
143 130300, 0x8c, 0x00, 12,
144 4, 14, 3, 20, 37, 37, 37, 80160 },
145 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 216000, /* 216 Mb */
146 162800, 0x8d, 0x00, 13,
147 4, 20, 3, 21, 38, 38, 38, 106880 },
148 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 243000, /* 243 Mb */
149 178200, 0x8e, 0x00, 14,
150 4, 23, 3, 22, 39, 39, 39, 120240 },
151 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 270000, /* 270 Mb */
152 192100, 0x8f, 0x00, 15,
153 4, 25, 3, 23, 40, 41, 41, 133600 },
154 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
155 207000, 0x8f, 0x00, 15,
156 4, 25, 3, 23, 40, 41, 41, 148400 },
157 },
158 50, /* probe interval */
159 50, /* rssi reduce interval */
160 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
161 };
162
163 /* TRUE_ALL - valid for 20/40/Legacy,
164 * TRUE - Legacy only,
165 * TRUE_20 - HT 20 only,
166 * TRUE_40 - HT 40 only */
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 struct ath_rate_table ar5416_11ng_ratetable = {
172 46,
173 {
174 { TRUE_ALL, TRUE_ALL, WLAN_PHY_CCK, 1000, /* 1 Mb */
175 900, 0x1b, 0x00, 2,
176 0, 0, 1, 0, 0, 0, 0, 0 },
177 { TRUE_ALL, TRUE_ALL, WLAN_PHY_CCK, 2000, /* 2 Mb */
178 1900, 0x1a, 0x04, 4,
179 1, 1, 1, 1, 1, 1, 1, 0 },
180 { TRUE_ALL, TRUE_ALL, WLAN_PHY_CCK, 5500, /* 5.5 Mb */
181 4900, 0x19, 0x04, 11,
182 2, 2, 2, 2, 2, 2, 2, 0 },
183 { TRUE_ALL, TRUE_ALL, WLAN_PHY_CCK, 11000, /* 11 Mb */
184 8100, 0x18, 0x04, 22,
185 3, 3, 2, 3, 3, 3, 3, 0 },
186 { FALSE, FALSE, WLAN_PHY_OFDM, 6000, /* 6 Mb */
187 5400, 0x0b, 0x00, 12,
188 4, 2, 1, 4, 4, 4, 4, 0 },
189 { FALSE, FALSE, WLAN_PHY_OFDM, 9000, /* 9 Mb */
190 7800, 0x0f, 0x00, 18,
191 4, 3, 1, 5, 5, 5, 5, 0 },
192 { TRUE, TRUE, WLAN_PHY_OFDM, 12000, /* 12 Mb */
193 10100, 0x0a, 0x00, 24,
194 6, 4, 1, 6, 6, 6, 6, 0 },
195 { TRUE, TRUE, WLAN_PHY_OFDM, 18000, /* 18 Mb */
196 14100, 0x0e, 0x00, 36,
197 6, 6, 2, 7, 7, 7, 7, 0 },
198 { TRUE, TRUE, WLAN_PHY_OFDM, 24000, /* 24 Mb */
199 17700, 0x09, 0x00, 48,
200 8, 10, 3, 8, 8, 8, 8, 0 },
201 { TRUE, TRUE, WLAN_PHY_OFDM, 36000, /* 36 Mb */
202 23700, 0x0d, 0x00, 72,
203 8, 14, 3, 9, 9, 9, 9, 0 },
204 { TRUE, TRUE, WLAN_PHY_OFDM, 48000, /* 48 Mb */
205 27400, 0x08, 0x00, 96,
206 8, 20, 3, 10, 10, 10, 10, 0 },
207 { TRUE, TRUE, WLAN_PHY_OFDM, 54000, /* 54 Mb */
208 30900, 0x0c, 0x00, 108,
209 8, 23, 3, 11, 11, 11, 11, 0 },
210 { FALSE, FALSE, WLAN_PHY_HT_20_SS, 6500, /* 6.5 Mb */
211 6400, 0x80, 0x00, 0,
212 4, 2, 3, 12, 28, 12, 28, 3216 },
213 { TRUE_20, TRUE_20, WLAN_PHY_HT_20_SS, 13000, /* 13 Mb */
214 12700, 0x81, 0x00, 1,
215 6, 4, 3, 13, 29, 13, 29, 6434 },
216 { TRUE_20, TRUE_20, WLAN_PHY_HT_20_SS, 19500, /* 19.5 Mb */
217 18800, 0x82, 0x00, 2,
218 6, 6, 3, 14, 30, 14, 30, 9650 },
219 { TRUE_20, TRUE_20, WLAN_PHY_HT_20_SS, 26000, /* 26 Mb */
220 25000, 0x83, 0x00, 3,
221 8, 10, 3, 15, 31, 15, 31, 12868 },
222 { TRUE_20, TRUE_20, WLAN_PHY_HT_20_SS, 39000, /* 39 Mb */
223 36700, 0x84, 0x00, 4,
224 8, 14, 3, 16, 32, 16, 32, 19304 },
225 { FALSE, TRUE_20, WLAN_PHY_HT_20_SS, 52000, /* 52 Mb */
226 48100, 0x85, 0x00, 5,
227 8, 20, 3, 17, 33, 17, 33, 25740 },
228 { FALSE, TRUE_20, WLAN_PHY_HT_20_SS, 58500, /* 58.5 Mb */
229 53500, 0x86, 0x00, 6,
230 8, 23, 3, 18, 34, 18, 34, 28956 },
231 { FALSE, TRUE_20, WLAN_PHY_HT_20_SS, 65000, /* 65 Mb */
232 59000, 0x87, 0x00, 7,
233 8, 25, 3, 19, 35, 19, 36, 32180 },
234 { FALSE, FALSE, WLAN_PHY_HT_20_DS, 13000, /* 13 Mb */
235 12700, 0x88, 0x00, 8,
236 4, 2, 3, 20, 37, 20, 37, 6430 },
237 { FALSE, FALSE, WLAN_PHY_HT_20_DS, 26000, /* 26 Mb */
238 24800, 0x89, 0x00, 9,
239 6, 4, 3, 21, 38, 21, 38, 12860 },
240 { FALSE, FALSE, WLAN_PHY_HT_20_DS, 39000, /* 39 Mb */
241 36600, 0x8a, 0x00, 10,
242 6, 6, 3, 22, 39, 22, 39, 19300 },
243 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 52000, /* 52 Mb */
244 48100, 0x8b, 0x00, 11,
245 8, 10, 3, 23, 40, 23, 40, 25736 },
246 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 78000, /* 78 Mb */
247 69500, 0x8c, 0x00, 12,
248 8, 14, 3, 24, 41, 24, 41, 38600 },
249 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 104000, /* 104 Mb */
250 89500, 0x8d, 0x00, 13,
251 8, 20, 3, 25, 42, 25, 42, 51472 },
252 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 117000, /* 117 Mb */
253 98900, 0x8e, 0x00, 14,
254 8, 23, 3, 26, 43, 26, 44, 57890 },
255 { TRUE_20, FALSE, WLAN_PHY_HT_20_DS, 130000, /* 130 Mb */
256 108300, 0x8f, 0x00, 15,
257 8, 25, 3, 27, 44, 27, 45, 64320 },
258 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 13500, /* 13.5 Mb */
259 13200, 0x80, 0x00, 0,
260 8, 2, 3, 12, 28, 28, 28, 6684 },
261 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 27500, /* 27.0 Mb */
262 25900, 0x81, 0x00, 1,
263 8, 4, 3, 13, 29, 29, 29, 13368 },
264 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 40500, /* 40.5 Mb */
265 38600, 0x82, 0x00, 2,
266 8, 6, 3, 14, 30, 30, 30, 20052 },
267 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 54000, /* 54 Mb */
268 49800, 0x83, 0x00, 3,
269 8, 10, 3, 15, 31, 31, 31, 26738 },
270 { TRUE_40, TRUE_40, WLAN_PHY_HT_40_SS, 81500, /* 81 Mb */
271 72200, 0x84, 0x00, 4,
272 8, 14, 3, 16, 32, 32, 32, 40104 },
273 { FALSE, TRUE_40, WLAN_PHY_HT_40_SS, 108000, /* 108 Mb */
274 92900, 0x85, 0x00, 5,
275 8, 20, 3, 17, 33, 33, 33, 53476 },
276 { FALSE, TRUE_40, WLAN_PHY_HT_40_SS, 121500, /* 121.5 Mb */
277 102700, 0x86, 0x00, 6,
278 8, 23, 3, 18, 34, 34, 34, 60156 },
279 { FALSE, TRUE_40, WLAN_PHY_HT_40_SS, 135000, /* 135 Mb */
280 112000, 0x87, 0x00, 7,
281 8, 23, 3, 19, 35, 36, 36, 66840 },
282 { FALSE, TRUE_40, WLAN_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
283 122000, 0x87, 0x00, 7,
284 8, 25, 3, 19, 35, 36, 36, 74200 },
285 { FALSE, FALSE, WLAN_PHY_HT_40_DS, 27000, /* 27 Mb */
286 25800, 0x88, 0x00, 8,
287 8, 2, 3, 20, 37, 37, 37, 13360 },
288 { FALSE, FALSE, WLAN_PHY_HT_40_DS, 54000, /* 54 Mb */
289 49800, 0x89, 0x00, 9,
290 8, 4, 3, 21, 38, 38, 38, 26720 },
291 { FALSE, FALSE, WLAN_PHY_HT_40_DS, 81000, /* 81 Mb */
292 71900, 0x8a, 0x00, 10,
293 8, 6, 3, 22, 39, 39, 39, 40080 },
294 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 108000, /* 108 Mb */
295 92500, 0x8b, 0x00, 11,
296 8, 10, 3, 23, 40, 40, 40, 53440 },
297 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 162000, /* 162 Mb */
298 130300, 0x8c, 0x00, 12,
299 8, 14, 3, 24, 41, 41, 41, 80160 },
300 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 216000, /* 216 Mb */
301 162800, 0x8d, 0x00, 13,
302 8, 20, 3, 25, 42, 42, 42, 106880 },
303 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 243000, /* 243 Mb */
304 178200, 0x8e, 0x00, 14,
305 8, 23, 3, 26, 43, 43, 43, 120240 },
306 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS, 270000, /* 270 Mb */
307 192100, 0x8f, 0x00, 15,
308 8, 23, 3, 27, 44, 45, 45, 133600 },
309 { TRUE_40, FALSE, WLAN_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
310 207000, 0x8f, 0x00, 15,
311 8, 25, 3, 27, 44, 45, 45, 148400 },
312 },
313 50, /* probe interval */
314 50, /* rssi reduce interval */
315 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
316 };
317
318 static struct ath_rate_table ar5416_11a_ratetable = {
319 8,
320 {
321 { TRUE, TRUE, WLAN_PHY_OFDM, 6000, /* 6 Mb */
322 5400, 0x0b, 0x00, (0x80|12),
323 0, 2, 1, 0, 0 },
324 { TRUE, TRUE, WLAN_PHY_OFDM, 9000, /* 9 Mb */
325 7800, 0x0f, 0x00, 18,
326 0, 3, 1, 1, 0 },
327 { TRUE, TRUE, WLAN_PHY_OFDM, 12000, /* 12 Mb */
328 10000, 0x0a, 0x00, (0x80|24),
329 2, 4, 2, 2, 0 },
330 { TRUE, TRUE, WLAN_PHY_OFDM, 18000, /* 18 Mb */
331 13900, 0x0e, 0x00, 36,
332 2, 6, 2, 3, 0 },
333 { TRUE, TRUE, WLAN_PHY_OFDM, 24000, /* 24 Mb */
334 17300, 0x09, 0x00, (0x80|48),
335 4, 10, 3, 4, 0 },
336 { TRUE, TRUE, WLAN_PHY_OFDM, 36000, /* 36 Mb */
337 23000, 0x0d, 0x00, 72,
338 4, 14, 3, 5, 0 },
339 { TRUE, TRUE, WLAN_PHY_OFDM, 48000, /* 48 Mb */
340 27400, 0x08, 0x00, 96,
341 4, 19, 3, 6, 0 },
342 { TRUE, TRUE, WLAN_PHY_OFDM, 54000, /* 54 Mb */
343 29300, 0x0c, 0x00, 108,
344 4, 23, 3, 7, 0 },
345 },
346 50, /* probe interval */
347 50, /* rssi reduce interval */
348 0, /* Phy rates allowed initially */
349 };
350
351 static struct ath_rate_table ar5416_11a_ratetable_Half = {
352 8,
353 {
354 { TRUE, TRUE, WLAN_PHY_OFDM, 3000, /* 6 Mb */
355 2700, 0x0b, 0x00, (0x80|6),
356 0, 2, 1, 0, 0},
357 { TRUE, TRUE, WLAN_PHY_OFDM, 4500, /* 9 Mb */
358 3900, 0x0f, 0x00, 9,
359 0, 3, 1, 1, 0 },
360 { TRUE, TRUE, WLAN_PHY_OFDM, 6000, /* 12 Mb */
361 5000, 0x0a, 0x00, (0x80|12),
362 2, 4, 2, 2, 0 },
363 { TRUE, TRUE, WLAN_PHY_OFDM, 9000, /* 18 Mb */
364 6950, 0x0e, 0x00, 18,
365 2, 6, 2, 3, 0 },
366 { TRUE, TRUE, WLAN_PHY_OFDM, 12000, /* 24 Mb */
367 8650, 0x09, 0x00, (0x80|24),
368 4, 10, 3, 4, 0 },
369 { TRUE, TRUE, WLAN_PHY_OFDM, 18000, /* 36 Mb */
370 11500, 0x0d, 0x00, 36,
371 4, 14, 3, 5, 0 },
372 { TRUE, TRUE, WLAN_PHY_OFDM, 24000, /* 48 Mb */
373 13700, 0x08, 0x00, 48,
374 4, 19, 3, 6, 0 },
375 { TRUE, TRUE, WLAN_PHY_OFDM, 27000, /* 54 Mb */
376 14650, 0x0c, 0x00, 54,
377 4, 23, 3, 7, 0 },
378 },
379 50, /* probe interval */
380 50, /* rssi reduce interval */
381 0, /* Phy rates allowed initially */
382 };
383
384 static struct ath_rate_table ar5416_11a_ratetable_Quarter = {
385 8,
386 {
387 { TRUE, TRUE, WLAN_PHY_OFDM, 1500, /* 6 Mb */
388 1350, 0x0b, 0x00, (0x80|3),
389 0, 2, 1, 0, 0 },
390 { TRUE, TRUE, WLAN_PHY_OFDM, 2250, /* 9 Mb */
391 1950, 0x0f, 0x00, 4,
392 0, 3, 1, 1, 0 },
393 { TRUE, TRUE, WLAN_PHY_OFDM, 3000, /* 12 Mb */
394 2500, 0x0a, 0x00, (0x80|6),
395 2, 4, 2, 2, 0 },
396 { TRUE, TRUE, WLAN_PHY_OFDM, 4500, /* 18 Mb */
397 3475, 0x0e, 0x00, 9,
398 2, 6, 2, 3, 0 },
399 { TRUE, TRUE, WLAN_PHY_OFDM, 6000, /* 25 Mb */
400 4325, 0x09, 0x00, (0x80|12),
401 4, 10, 3, 4, 0 },
402 { TRUE, TRUE, WLAN_PHY_OFDM, 9000, /* 36 Mb */
403 5750, 0x0d, 0x00, 18,
404 4, 14, 3, 5, 0 },
405 { TRUE, TRUE, WLAN_PHY_OFDM, 12000, /* 48 Mb */
406 6850, 0x08, 0x00, 24,
407 4, 19, 3, 6, 0 },
408 { TRUE, TRUE, WLAN_PHY_OFDM, 13500, /* 54 Mb */
409 7325, 0x0c, 0x00, 27,
410 4, 23, 3, 7, 0 },
411 },
412 50, /* probe interval */
413 50, /* rssi reduce interval */
414 0, /* Phy rates allowed initially */
415 };
416
417 static struct ath_rate_table ar5416_11g_ratetable = {
418 12,
419 {
420 { TRUE, TRUE, WLAN_PHY_CCK, 1000, /* 1 Mb */
421 900, 0x1b, 0x00, 2,
422 0, 0, 1, 0, 0 },
423 { TRUE, TRUE, WLAN_PHY_CCK, 2000, /* 2 Mb */
424 1900, 0x1a, 0x04, 4,
425 1, 1, 1, 1, 0 },
426 { TRUE, TRUE, WLAN_PHY_CCK, 5500, /* 5.5 Mb */
427 4900, 0x19, 0x04, 11,
428 2, 2, 2, 2, 0 },
429 { TRUE, TRUE, WLAN_PHY_CCK, 11000, /* 11 Mb */
430 8100, 0x18, 0x04, 22,
431 3, 3, 2, 3, 0 },
432 { FALSE, FALSE, WLAN_PHY_OFDM, 6000, /* 6 Mb */
433 5400, 0x0b, 0x00, 12,
434 4, 2, 1, 4, 0 },
435 { FALSE, FALSE, WLAN_PHY_OFDM, 9000, /* 9 Mb */
436 7800, 0x0f, 0x00, 18,
437 4, 3, 1, 5, 0 },
438 { TRUE, TRUE, WLAN_PHY_OFDM, 12000, /* 12 Mb */
439 10000, 0x0a, 0x00, 24,
440 6, 4, 1, 6, 0 },
441 { TRUE, TRUE, WLAN_PHY_OFDM, 18000, /* 18 Mb */
442 13900, 0x0e, 0x00, 36,
443 6, 6, 2, 7, 0 },
444 { TRUE, TRUE, WLAN_PHY_OFDM, 24000, /* 24 Mb */
445 17300, 0x09, 0x00, 48,
446 8, 10, 3, 8, 0 },
447 { TRUE, TRUE, WLAN_PHY_OFDM, 36000, /* 36 Mb */
448 23000, 0x0d, 0x00, 72,
449 8, 14, 3, 9, 0 },
450 { TRUE, TRUE, WLAN_PHY_OFDM, 48000, /* 48 Mb */
451 27400, 0x08, 0x00, 96,
452 8, 19, 3, 10, 0 },
453 { TRUE, TRUE, WLAN_PHY_OFDM, 54000, /* 54 Mb */
454 29300, 0x0c, 0x00, 108,
455 8, 23, 3, 11, 0 },
456 },
457 50, /* probe interval */
458 50, /* rssi reduce interval */
459 0, /* Phy rates allowed initially */
460 };
461
462 static struct ath_rate_table ar5416_11b_ratetable = {
463 4,
464 {
465 { TRUE, TRUE, WLAN_PHY_CCK, 1000, /* 1 Mb */
466 900, 0x1b, 0x00, (0x80|2),
467 0, 0, 1, 0, 0 },
468 { TRUE, TRUE, WLAN_PHY_CCK, 2000, /* 2 Mb */
469 1800, 0x1a, 0x04, (0x80|4),
470 1, 1, 1, 1, 0 },
471 { TRUE, TRUE, WLAN_PHY_CCK, 5500, /* 5.5 Mb */
472 4300, 0x19, 0x04, (0x80|11),
473 1, 2, 2, 2, 0 },
474 { TRUE, TRUE, WLAN_PHY_CCK, 11000, /* 11 Mb */
475 7100, 0x18, 0x04, (0x80|22),
476 1, 4, 100, 3, 0 },
477 },
478 100, /* probe interval */
479 100, /* rssi reduce interval */
480 0, /* Phy rates allowed initially */
481 };
482
483 static void ar5416_attach_ratetables(struct ath_rate_softc *sc)
484 {
485 /*
486 * Attach rate tables.
487 */
488 sc->hw_rate_table[ATH9K_MODE_11B] = &ar5416_11b_ratetable;
489 sc->hw_rate_table[ATH9K_MODE_11A] = &ar5416_11a_ratetable;
490 sc->hw_rate_table[ATH9K_MODE_11G] = &ar5416_11g_ratetable;
491
492 sc->hw_rate_table[ATH9K_MODE_11NA_HT20] = &ar5416_11na_ratetable;
493 sc->hw_rate_table[ATH9K_MODE_11NG_HT20] = &ar5416_11ng_ratetable;
494 sc->hw_rate_table[ATH9K_MODE_11NA_HT40PLUS] =
495 &ar5416_11na_ratetable;
496 sc->hw_rate_table[ATH9K_MODE_11NA_HT40MINUS] =
497 &ar5416_11na_ratetable;
498 sc->hw_rate_table[ATH9K_MODE_11NG_HT40PLUS] =
499 &ar5416_11ng_ratetable;
500 sc->hw_rate_table[ATH9K_MODE_11NG_HT40MINUS] =
501 &ar5416_11ng_ratetable;
502 }
503
504 static void ar5416_setquarter_ratetable(struct ath_rate_softc *sc)
505 {
506 sc->hw_rate_table[ATH9K_MODE_11A] = &ar5416_11a_ratetable_Quarter;
507 return;
508 }
509
510 static void ar5416_sethalf_ratetable(struct ath_rate_softc *sc)
511 {
512 sc->hw_rate_table[ATH9K_MODE_11A] = &ar5416_11a_ratetable_Half;
513 return;
514 }
515
516 static void ar5416_setfull_ratetable(struct ath_rate_softc *sc)
517 {
518 sc->hw_rate_table[ATH9K_MODE_11A] = &ar5416_11a_ratetable;
519 return;
520 }
521
522 /*
523 * Return the median of three numbers
524 */
525 static inline int8_t median(int8_t a, int8_t b, int8_t c)
526 {
527 if (a >= b) {
528 if (b >= c)
529 return b;
530 else if (a > c)
531 return c;
532 else
533 return a;
534 } else {
535 if (a >= c)
536 return a;
537 else if (b >= c)
538 return c;
539 else
540 return b;
541 }
542 }
543
544 static void ath_rc_sort_validrates(const struct ath_rate_table *rate_table,
545 struct ath_rate_node *ath_rc_priv)
546 {
547 u8 i, j, idx, idx_next;
548
549 for (i = ath_rc_priv->max_valid_rate - 1; i > 0; i--) {
550 for (j = 0; j <= i-1; j++) {
551 idx = ath_rc_priv->valid_rate_index[j];
552 idx_next = ath_rc_priv->valid_rate_index[j+1];
553
554 if (rate_table->info[idx].ratekbps >
555 rate_table->info[idx_next].ratekbps) {
556 ath_rc_priv->valid_rate_index[j] = idx_next;
557 ath_rc_priv->valid_rate_index[j+1] = idx;
558 }
559 }
560 }
561 }
562
563 /* Access functions for valid_txrate_mask */
564
565 static void ath_rc_init_valid_txmask(struct ath_rate_node *ath_rc_priv)
566 {
567 u8 i;
568
569 for (i = 0; i < ath_rc_priv->rate_table_size; i++)
570 ath_rc_priv->valid_rate_index[i] = FALSE;
571 }
572
573 static inline void ath_rc_set_valid_txmask(struct ath_rate_node *ath_rc_priv,
574 u8 index, int valid_tx_rate)
575 {
576 ASSERT(index <= ath_rc_priv->rate_table_size);
577 ath_rc_priv->valid_rate_index[index] = valid_tx_rate ? TRUE : FALSE;
578 }
579
580 static inline int ath_rc_isvalid_txmask(struct ath_rate_node *ath_rc_priv,
581 u8 index)
582 {
583 ASSERT(index <= ath_rc_priv->rate_table_size);
584 return ath_rc_priv->valid_rate_index[index];
585 }
586
587 /* Iterators for valid_txrate_mask */
588 static inline int
589 ath_rc_get_nextvalid_txrate(const struct ath_rate_table *rate_table,
590 struct ath_rate_node *ath_rc_priv,
591 u8 cur_valid_txrate,
592 u8 *next_idx)
593 {
594 u8 i;
595
596 for (i = 0; i < ath_rc_priv->max_valid_rate - 1; i++) {
597 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
598 *next_idx = ath_rc_priv->valid_rate_index[i+1];
599 return TRUE;
600 }
601 }
602
603 /* No more valid rates */
604 *next_idx = 0;
605 return FALSE;
606 }
607
608 /* Return true only for single stream */
609
610 static int ath_rc_valid_phyrate(u32 phy, u32 capflag, int ignore_cw)
611 {
612 if (WLAN_RC_PHY_HT(phy) & !(capflag & WLAN_RC_HT_FLAG))
613 return FALSE;
614 if (WLAN_RC_PHY_DS(phy) && !(capflag & WLAN_RC_DS_FLAG))
615 return FALSE;
616 if (WLAN_RC_PHY_SGI(phy) && !(capflag & WLAN_RC_SGI_FLAG))
617 return FALSE;
618 if (!ignore_cw && WLAN_RC_PHY_HT(phy))
619 if (WLAN_RC_PHY_40(phy) && !(capflag & WLAN_RC_40_FLAG))
620 return FALSE;
621 if (!WLAN_RC_PHY_40(phy) && (capflag & WLAN_RC_40_FLAG))
622 return FALSE;
623 return TRUE;
624 }
625
626 static inline int
627 ath_rc_get_nextlowervalid_txrate(const struct ath_rate_table *rate_table,
628 struct ath_rate_node *ath_rc_priv,
629 u8 cur_valid_txrate, u8 *next_idx)
630 {
631 int8_t i;
632
633 for (i = 1; i < ath_rc_priv->max_valid_rate ; i++) {
634 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
635 *next_idx = ath_rc_priv->valid_rate_index[i-1];
636 return TRUE;
637 }
638 }
639 return FALSE;
640 }
641
642 /*
643 * Initialize the Valid Rate Index from valid entries in Rate Table
644 */
645 static u8
646 ath_rc_sib_init_validrates(struct ath_rate_node *ath_rc_priv,
647 const struct ath_rate_table *rate_table,
648 u32 capflag)
649 {
650 u8 i, hi = 0;
651 u32 valid;
652
653 for (i = 0; i < rate_table->rate_cnt; i++) {
654 valid = (ath_rc_priv->single_stream ?
655 rate_table->info[i].valid_single_stream :
656 rate_table->info[i].valid);
657 if (valid == TRUE) {
658 u32 phy = rate_table->info[i].phy;
659 u8 valid_rate_count = 0;
660
661 if (!ath_rc_valid_phyrate(phy, capflag, FALSE))
662 continue;
663
664 valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];
665
666 ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = i;
667 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
668 ath_rc_set_valid_txmask(ath_rc_priv, i, TRUE);
669 hi = A_MAX(hi, i);
670 }
671 }
672 return hi;
673 }
674
675 /*
676 * Initialize the Valid Rate Index from Rate Set
677 */
678 static u8
679 ath_rc_sib_setvalid_rates(struct ath_rate_node *ath_rc_priv,
680 const struct ath_rate_table *rate_table,
681 struct ath_rateset *rateset,
682 u32 capflag)
683 {
684 /* XXX: Clean me up and make identation friendly */
685 u8 i, j, hi = 0;
686
687 /* Use intersection of working rates and valid rates */
688 for (i = 0; i < rateset->rs_nrates; i++) {
689 for (j = 0; j < rate_table->rate_cnt; j++) {
690 u32 phy = rate_table->info[j].phy;
691 u32 valid = (ath_rc_priv->single_stream ?
692 rate_table->info[j].valid_single_stream :
693 rate_table->info[j].valid);
694
695 /* We allow a rate only if its valid and the
696 * capflag matches one of the validity
697 * (TRUE/TRUE_20/TRUE_40) flags */
698
699 /* XXX: catch the negative of this branch
700 * first and then continue */
701 if (((rateset->rs_rates[i] & 0x7F) ==
702 (rate_table->info[j].dot11rate & 0x7F)) &&
703 ((valid & WLAN_RC_CAP_MODE(capflag)) ==
704 WLAN_RC_CAP_MODE(capflag)) &&
705 !WLAN_RC_PHY_HT(phy)) {
706
707 u8 valid_rate_count = 0;
708
709 if (!ath_rc_valid_phyrate(phy, capflag, FALSE))
710 continue;
711
712 valid_rate_count =
713 ath_rc_priv->valid_phy_ratecnt[phy];
714
715 ath_rc_priv->valid_phy_rateidx[phy]
716 [valid_rate_count] = j;
717 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
718 ath_rc_set_valid_txmask(ath_rc_priv, j, TRUE);
719 hi = A_MAX(hi, j);
720 }
721 }
722 }
723 return hi;
724 }
725
726 static u8
727 ath_rc_sib_setvalid_htrates(struct ath_rate_node *ath_rc_priv,
728 const struct ath_rate_table *rate_table,
729 u8 *mcs_set, u32 capflag)
730 {
731 u8 i, j, hi = 0;
732
733 /* Use intersection of working rates and valid rates */
734 for (i = 0; i < ((struct ath_rateset *)mcs_set)->rs_nrates; i++) {
735 for (j = 0; j < rate_table->rate_cnt; j++) {
736 u32 phy = rate_table->info[j].phy;
737 u32 valid = (ath_rc_priv->single_stream ?
738 rate_table->info[j].valid_single_stream :
739 rate_table->info[j].valid);
740
741 if (((((struct ath_rateset *)
742 mcs_set)->rs_rates[i] & 0x7F) !=
743 (rate_table->info[j].dot11rate & 0x7F)) ||
744 !WLAN_RC_PHY_HT(phy) ||
745 !WLAN_RC_PHY_HT_VALID(valid, capflag))
746 continue;
747
748 if (!ath_rc_valid_phyrate(phy, capflag, FALSE))
749 continue;
750
751 ath_rc_priv->valid_phy_rateidx[phy]
752 [ath_rc_priv->valid_phy_ratecnt[phy]] = j;
753 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
754 ath_rc_set_valid_txmask(ath_rc_priv, j, TRUE);
755 hi = A_MAX(hi, j);
756 }
757 }
758 return hi;
759 }
760
761 /*
762 * Attach to a device instance. Setup the public definition
763 * of how much per-node space we need and setup the private
764 * phy tables that have rate control parameters.
765 */
766 struct ath_rate_softc *ath_rate_attach(struct ath_hal *ah)
767 {
768 struct ath_rate_softc *asc;
769
770 /* we are only in user context so we can sleep for memory */
771 asc = kzalloc(sizeof(struct ath_rate_softc), GFP_KERNEL);
772 if (asc == NULL)
773 return NULL;
774
775 ar5416_attach_ratetables(asc);
776
777 /* Save Maximum TX Trigger Level (used for 11n) */
778 tx_triglevel_max = ah->ah_caps.tx_triglevel_max;
779 /* return alias for ath_rate_softc * */
780 return asc;
781 }
782
783 void ath_rate_detach(struct ath_rate_softc *asc)
784 {
785 if (asc != NULL)
786 kfree(asc);
787 }
788
789 u8 ath_rate_findrateix(struct ath_softc *sc,
790 u8 dot11rate)
791 {
792 const struct ath_rate_table *ratetable;
793 struct ath_rate_softc *rsc = sc->sc_rc;
794 int i;
795
796 ratetable = rsc->hw_rate_table[sc->sc_curmode];
797
798 if (WARN_ON(!ratetable))
799 return 0;
800
801 for (i = 0; i < ratetable->rate_cnt; i++) {
802 if ((ratetable->info[i].dot11rate & 0x7f) == (dot11rate & 0x7f))
803 return i;
804 }
805
806 return 0;
807 }
808
809 /*
810 * Update rate-control state on a device state change. When
811 * operating as a station this includes associate/reassociate
812 * with an AP. Otherwise this gets called, for example, when
813 * the we transition to run state when operating as an AP.
814 */
815 void ath_rate_newstate(struct ath_softc *sc, struct ath_vap *avp)
816 {
817 struct ath_rate_softc *asc = sc->sc_rc;
818
819 /* For half and quarter rate channles use different
820 * rate tables
821 */
822 if (sc->sc_ah->ah_curchan->channelFlags & CHANNEL_HALF)
823 ar5416_sethalf_ratetable(asc);
824 else if (sc->sc_ah->ah_curchan->channelFlags & CHANNEL_QUARTER)
825 ar5416_setquarter_ratetable(asc);
826 else /* full rate */
827 ar5416_setfull_ratetable(asc);
828
829 if (avp->av_config.av_fixed_rateset != IEEE80211_FIXED_RATE_NONE) {
830 asc->fixedrix =
831 sc->sc_rixmap[avp->av_config.av_fixed_rateset & 0xff];
832 /* NB: check the fixed rate exists */
833 if (asc->fixedrix == 0xff)
834 asc->fixedrix = IEEE80211_FIXED_RATE_NONE;
835 } else {
836 asc->fixedrix = IEEE80211_FIXED_RATE_NONE;
837 }
838 }
839
840 static u8 ath_rc_ratefind_ht(struct ath_softc *sc,
841 struct ath_rate_node *ath_rc_priv,
842 const struct ath_rate_table *rate_table,
843 int probe_allowed, int *is_probing,
844 int is_retry)
845 {
846 u32 dt, best_thruput, this_thruput, now_msec;
847 u8 rate, next_rate, best_rate, maxindex, minindex;
848 int8_t rssi_last, rssi_reduce = 0, index = 0;
849
850 *is_probing = FALSE;
851
852 rssi_last = median(ath_rc_priv->rssi_last,
853 ath_rc_priv->rssi_last_prev,
854 ath_rc_priv->rssi_last_prev2);
855
856 /*
857 * Age (reduce) last ack rssi based on how old it is.
858 * The bizarre numbers are so the delta is 160msec,
859 * meaning we divide by 16.
860 * 0msec <= dt <= 25msec: don't derate
861 * 25msec <= dt <= 185msec: derate linearly from 0 to 10dB
862 * 185msec <= dt: derate by 10dB
863 */
864
865 now_msec = jiffies_to_msecs(jiffies);
866 dt = now_msec - ath_rc_priv->rssi_time;
867
868 if (dt >= 185)
869 rssi_reduce = 10;
870 else if (dt >= 25)
871 rssi_reduce = (u8)((dt - 25) >> 4);
872
873 /* Now reduce rssi_last by rssi_reduce */
874 if (rssi_last < rssi_reduce)
875 rssi_last = 0;
876 else
877 rssi_last -= rssi_reduce;
878
879 /*
880 * Now look up the rate in the rssi table and return it.
881 * If no rates match then we return 0 (lowest rate)
882 */
883
884 best_thruput = 0;
885 maxindex = ath_rc_priv->max_valid_rate-1;
886
887 minindex = 0;
888 best_rate = minindex;
889
890 /*
891 * Try the higher rate first. It will reduce memory moving time
892 * if we have very good channel characteristics.
893 */
894 for (index = maxindex; index >= minindex ; index--) {
895 u8 per_thres;
896
897 rate = ath_rc_priv->valid_rate_index[index];
898 if (rate > ath_rc_priv->rate_max_phy)
899 continue;
900
901 /*
902 * For TCP the average collision rate is around 11%,
903 * so we ignore PERs less than this. This is to
904 * prevent the rate we are currently using (whose
905 * PER might be in the 10-15 range because of TCP
906 * collisions) looking worse than the next lower
907 * rate whose PER has decayed close to 0. If we
908 * used to next lower rate, its PER would grow to
909 * 10-15 and we would be worse off then staying
910 * at the current rate.
911 */
912 per_thres = ath_rc_priv->state[rate].per;
913 if (per_thres < 12)
914 per_thres = 12;
915
916 this_thruput = rate_table->info[rate].user_ratekbps *
917 (100 - per_thres);
918
919 if (best_thruput <= this_thruput) {
920 best_thruput = this_thruput;
921 best_rate = rate;
922 }
923 }
924
925 rate = best_rate;
926
927 /* if we are retrying for more than half the number
928 * of max retries, use the min rate for the next retry
929 */
930 if (is_retry)
931 rate = ath_rc_priv->valid_rate_index[minindex];
932
933 ath_rc_priv->rssi_last_lookup = rssi_last;
934
935 /*
936 * Must check the actual rate (ratekbps) to account for
937 * non-monoticity of 11g's rate table
938 */
939
940 if (rate >= ath_rc_priv->rate_max_phy && probe_allowed) {
941 rate = ath_rc_priv->rate_max_phy;
942
943 /* Probe the next allowed phy state */
944 /* FIXME:XXXX Check to make sure ratMax is checked properly */
945 if (ath_rc_get_nextvalid_txrate(rate_table,
946 ath_rc_priv, rate, &next_rate) &&
947 (now_msec - ath_rc_priv->probe_time >
948 rate_table->probe_interval) &&
949 (ath_rc_priv->hw_maxretry_pktcnt >= 1)) {
950 rate = next_rate;
951 ath_rc_priv->probe_rate = rate;
952 ath_rc_priv->probe_time = now_msec;
953 ath_rc_priv->hw_maxretry_pktcnt = 0;
954 *is_probing = TRUE;
955 }
956 }
957
958 /*
959 * Make sure rate is not higher than the allowed maximum.
960 * We should also enforce the min, but I suspect the min is
961 * normally 1 rather than 0 because of the rate 9 vs 6 issue
962 * in the old code.
963 */
964 if (rate > (ath_rc_priv->rate_table_size - 1))
965 rate = ath_rc_priv->rate_table_size - 1;
966
967 ASSERT((rate_table->info[rate].valid && !ath_rc_priv->single_stream) ||
968 (rate_table->info[rate].valid_single_stream &&
969 ath_rc_priv->single_stream));
970
971 return rate;
972 }
973
974 static void ath_rc_rate_set_series(const struct ath_rate_table *rate_table ,
975 struct ath_rc_series *series,
976 u8 tries,
977 u8 rix,
978 int rtsctsenable)
979 {
980 series->tries = tries;
981 series->flags = (rtsctsenable ? ATH_RC_RTSCTS_FLAG : 0) |
982 (WLAN_RC_PHY_DS(rate_table->info[rix].phy) ?
983 ATH_RC_DS_FLAG : 0) |
984 (WLAN_RC_PHY_40(rate_table->info[rix].phy) ?
985 ATH_RC_CW40_FLAG : 0) |
986 (WLAN_RC_PHY_SGI(rate_table->info[rix].phy) ?
987 ATH_RC_SGI_FLAG : 0);
988
989 series->rix = rate_table->info[rix].base_index;
990 series->max_4ms_framelen = rate_table->info[rix].max_4ms_framelen;
991 }
992
993 static u8 ath_rc_rate_getidx(struct ath_softc *sc,
994 struct ath_rate_node *ath_rc_priv,
995 const struct ath_rate_table *rate_table,
996 u8 rix, u16 stepdown,
997 u16 min_rate)
998 {
999 u32 j;
1000 u8 nextindex;
1001
1002 if (min_rate) {
1003 for (j = RATE_TABLE_SIZE; j > 0; j--) {
1004 if (ath_rc_get_nextlowervalid_txrate(rate_table,
1005 ath_rc_priv, rix, &nextindex))
1006 rix = nextindex;
1007 else
1008 break;
1009 }
1010 } else {
1011 for (j = stepdown; j > 0; j--) {
1012 if (ath_rc_get_nextlowervalid_txrate(rate_table,
1013 ath_rc_priv, rix, &nextindex))
1014 rix = nextindex;
1015 else
1016 break;
1017 }
1018 }
1019 return rix;
1020 }
1021
1022 static void ath_rc_ratefind(struct ath_softc *sc,
1023 struct ath_rate_node *ath_rc_priv,
1024 int num_tries, int num_rates, unsigned int rcflag,
1025 struct ath_rc_series series[], int *is_probe,
1026 int is_retry)
1027 {
1028 u8 try_per_rate = 0, i = 0, rix, nrix;
1029 struct ath_rate_softc *asc = (struct ath_rate_softc *)sc->sc_rc;
1030 struct ath_rate_table *rate_table;
1031
1032 rate_table =
1033 (struct ath_rate_table *)asc->hw_rate_table[sc->sc_curmode];
1034 rix = ath_rc_ratefind_ht(sc, ath_rc_priv, rate_table,
1035 (rcflag & ATH_RC_PROBE_ALLOWED) ? 1 : 0,
1036 is_probe, is_retry);
1037 nrix = rix;
1038
1039 if ((rcflag & ATH_RC_PROBE_ALLOWED) && (*is_probe)) {
1040 /* set one try for probe rates. For the
1041 * probes don't enable rts */
1042 ath_rc_rate_set_series(rate_table,
1043 &series[i++], 1, nrix, FALSE);
1044
1045 try_per_rate = (num_tries/num_rates);
1046 /* Get the next tried/allowed rate. No RTS for the next series
1047 * after the probe rate
1048 */
1049 nrix = ath_rc_rate_getidx(sc,
1050 ath_rc_priv, rate_table, nrix, 1, FALSE);
1051 ath_rc_rate_set_series(rate_table,
1052 &series[i++], try_per_rate, nrix, 0);
1053 } else {
1054 try_per_rate = (num_tries/num_rates);
1055 /* Set the choosen rate. No RTS for first series entry. */
1056 ath_rc_rate_set_series(rate_table,
1057 &series[i++], try_per_rate, nrix, FALSE);
1058 }
1059
1060 /* Fill in the other rates for multirate retry */
1061 for ( ; i < num_rates; i++) {
1062 u8 try_num;
1063 u8 min_rate;
1064
1065 try_num = ((i + 1) == num_rates) ?
1066 num_tries - (try_per_rate * i) : try_per_rate ;
1067 min_rate = (((i + 1) == num_rates) &&
1068 (rcflag & ATH_RC_MINRATE_LASTRATE)) ? 1 : 0;
1069
1070 nrix = ath_rc_rate_getidx(sc, ath_rc_priv,
1071 rate_table, nrix, 1, min_rate);
1072 /* All other rates in the series have RTS enabled */
1073 ath_rc_rate_set_series(rate_table,
1074 &series[i], try_num, nrix, TRUE);
1075 }
1076
1077 /*
1078 * NB:Change rate series to enable aggregation when operating
1079 * at lower MCS rates. When first rate in series is MCS2
1080 * in HT40 @ 2.4GHz, series should look like:
1081 *
1082 * {MCS2, MCS1, MCS0, MCS0}.
1083 *
1084 * When first rate in series is MCS3 in HT20 @ 2.4GHz, series should
1085 * look like:
1086 *
1087 * {MCS3, MCS2, MCS1, MCS1}
1088 *
1089 * So, set fourth rate in series to be same as third one for
1090 * above conditions.
1091 */
1092 if ((sc->sc_curmode == ATH9K_MODE_11NG_HT20) ||
1093 (sc->sc_curmode == ATH9K_MODE_11NG_HT40PLUS) ||
1094 (sc->sc_curmode == ATH9K_MODE_11NG_HT40MINUS)) {
1095 u8 dot11rate = rate_table->info[rix].dot11rate;
1096 u8 phy = rate_table->info[rix].phy;
1097 if (i == 4 &&
1098 ((dot11rate == 2 && phy == WLAN_RC_PHY_HT_40_SS) ||
1099 (dot11rate == 3 && phy == WLAN_RC_PHY_HT_20_SS))) {
1100 series[3].rix = series[2].rix;
1101 series[3].flags = series[2].flags;
1102 series[3].max_4ms_framelen = series[2].max_4ms_framelen;
1103 }
1104 }
1105 }
1106
1107 /*
1108 * Return the Tx rate series.
1109 */
1110 static void ath_rate_findrate(struct ath_softc *sc,
1111 struct ath_rate_node *ath_rc_priv,
1112 int num_tries,
1113 int num_rates,
1114 unsigned int rcflag,
1115 struct ath_rc_series series[],
1116 int *is_probe,
1117 int is_retry)
1118 {
1119 struct ath_vap *avp = ath_rc_priv->avp;
1120
1121 DPRINTF(sc, ATH_DBG_RATE, "%s\n", __func__);
1122
1123 if (!num_rates || !num_tries)
1124 return;
1125
1126 if (avp->av_config.av_fixed_rateset == IEEE80211_FIXED_RATE_NONE) {
1127 ath_rc_ratefind(sc, ath_rc_priv, num_tries, num_rates,
1128 rcflag, series, is_probe, is_retry);
1129 } else {
1130 /* Fixed rate */
1131 int idx;
1132 u8 flags;
1133 u32 rix;
1134 struct ath_rate_softc *asc = ath_rc_priv->asc;
1135 struct ath_rate_table *rate_table;
1136
1137 rate_table = (struct ath_rate_table *)
1138 asc->hw_rate_table[sc->sc_curmode];
1139
1140 for (idx = 0; idx < 4; idx++) {
1141 unsigned int mcs;
1142 u8 series_rix = 0;
1143
1144 series[idx].tries = IEEE80211_RATE_IDX_ENTRY(
1145 avp->av_config.av_fixed_retryset, idx);
1146
1147 mcs = IEEE80211_RATE_IDX_ENTRY(
1148 avp->av_config.av_fixed_rateset, idx);
1149
1150 if (idx == 3 && (mcs & 0xf0) == 0x70)
1151 mcs = (mcs & ~0xf0)|0x80;
1152
1153 if (!(mcs & 0x80))
1154 flags = 0;
1155 else
1156 flags = ((ath_rc_priv->ht_cap &
1157 WLAN_RC_DS_FLAG) ?
1158 ATH_RC_DS_FLAG : 0) |
1159 ((ath_rc_priv->ht_cap &
1160 WLAN_RC_40_FLAG) ?
1161 ATH_RC_CW40_FLAG : 0) |
1162 ((ath_rc_priv->ht_cap &
1163 WLAN_RC_SGI_FLAG) ?
1164 ((ath_rc_priv->ht_cap &
1165 WLAN_RC_40_FLAG) ?
1166 ATH_RC_SGI_FLAG : 0) : 0);
1167
1168 series[idx].rix = sc->sc_rixmap[mcs];
1169 series_rix = series[idx].rix;
1170
1171 /* XXX: Give me some cleanup love */
1172 if ((flags & ATH_RC_CW40_FLAG) &&
1173 (flags & ATH_RC_SGI_FLAG))
1174 rix = rate_table->info[series_rix].ht_index;
1175 else if (flags & ATH_RC_SGI_FLAG)
1176 rix = rate_table->info[series_rix].sgi_index;
1177 else if (flags & ATH_RC_CW40_FLAG)
1178 rix = rate_table->info[series_rix].cw40index;
1179 else
1180 rix = rate_table->info[series_rix].base_index;
1181 series[idx].max_4ms_framelen =
1182 rate_table->info[rix].max_4ms_framelen;
1183 series[idx].flags = flags;
1184 }
1185 }
1186 }
1187
1188 static void ath_rc_update_ht(struct ath_softc *sc,
1189 struct ath_rate_node *ath_rc_priv,
1190 struct ath_tx_info_priv *info_priv,
1191 int tx_rate, int xretries, int retries)
1192 {
1193 u32 now_msec = jiffies_to_msecs(jiffies);
1194 int state_change = FALSE, rate, count;
1195 u8 last_per;
1196 struct ath_rate_softc *asc = (struct ath_rate_softc *)sc->sc_rc;
1197 struct ath_rate_table *rate_table =
1198 (struct ath_rate_table *)asc->hw_rate_table[sc->sc_curmode];
1199
1200 static u32 nretry_to_per_lookup[10] = {
1201 100 * 0 / 1,
1202 100 * 1 / 4,
1203 100 * 1 / 2,
1204 100 * 3 / 4,
1205 100 * 4 / 5,
1206 100 * 5 / 6,
1207 100 * 6 / 7,
1208 100 * 7 / 8,
1209 100 * 8 / 9,
1210 100 * 9 / 10
1211 };
1212
1213 if (!ath_rc_priv)
1214 return;
1215
1216 ASSERT(tx_rate >= 0);
1217 if (tx_rate < 0)
1218 return;
1219
1220 /* To compensate for some imbalance between ctrl and ext. channel */
1221
1222 if (WLAN_RC_PHY_40(rate_table->info[tx_rate].phy))
1223 info_priv->tx.ts_rssi =
1224 info_priv->tx.ts_rssi < 3 ? 0 :
1225 info_priv->tx.ts_rssi - 3;
1226
1227 last_per = ath_rc_priv->state[tx_rate].per;
1228
1229 if (xretries) {
1230 /* Update the PER. */
1231 if (xretries == 1) {
1232 ath_rc_priv->state[tx_rate].per += 30;
1233 if (ath_rc_priv->state[tx_rate].per > 100)
1234 ath_rc_priv->state[tx_rate].per = 100;
1235 } else {
1236 /* xretries == 2 */
1237 count = ARRAY_SIZE(nretry_to_per_lookup);
1238 if (retries >= count)
1239 retries = count - 1;
1240 /* new_PER = 7/8*old_PER + 1/8*(currentPER) */
1241 ath_rc_priv->state[tx_rate].per =
1242 (u8)(ath_rc_priv->state[tx_rate].per -
1243 (ath_rc_priv->state[tx_rate].per >> 3) +
1244 ((100) >> 3));
1245 }
1246
1247 /* xretries == 1 or 2 */
1248
1249 if (ath_rc_priv->probe_rate == tx_rate)
1250 ath_rc_priv->probe_rate = 0;
1251
1252 } else { /* xretries == 0 */
1253 /* Update the PER. */
1254 /* Make sure it doesn't index out of array's bounds. */
1255 count = ARRAY_SIZE(nretry_to_per_lookup);
1256 if (retries >= count)
1257 retries = count - 1;
1258 if (info_priv->n_bad_frames) {
1259 /* new_PER = 7/8*old_PER + 1/8*(currentPER)
1260 * Assuming that n_frames is not 0. The current PER
1261 * from the retries is 100 * retries / (retries+1),
1262 * since the first retries attempts failed, and the
1263 * next one worked. For the one that worked,
1264 * n_bad_frames subframes out of n_frames wored,
1265 * so the PER for that part is
1266 * 100 * n_bad_frames / n_frames, and it contributes
1267 * 100 * n_bad_frames / (n_frames * (retries+1)) to
1268 * the above PER. The expression below is a
1269 * simplified version of the sum of these two terms.
1270 */
1271 if (info_priv->n_frames > 0)
1272 ath_rc_priv->state[tx_rate].per
1273 = (u8)
1274 (ath_rc_priv->state[tx_rate].per -
1275 (ath_rc_priv->state[tx_rate].per >> 3) +
1276 ((100*(retries*info_priv->n_frames +
1277 info_priv->n_bad_frames) /
1278 (info_priv->n_frames *
1279 (retries+1))) >> 3));
1280 } else {
1281 /* new_PER = 7/8*old_PER + 1/8*(currentPER) */
1282
1283 ath_rc_priv->state[tx_rate].per = (u8)
1284 (ath_rc_priv->state[tx_rate].per -
1285 (ath_rc_priv->state[tx_rate].per >> 3) +
1286 (nretry_to_per_lookup[retries] >> 3));
1287 }
1288
1289 ath_rc_priv->rssi_last_prev2 = ath_rc_priv->rssi_last_prev;
1290 ath_rc_priv->rssi_last_prev = ath_rc_priv->rssi_last;
1291 ath_rc_priv->rssi_last = info_priv->tx.ts_rssi;
1292 ath_rc_priv->rssi_time = now_msec;
1293
1294 /*
1295 * If we got at most one retry then increase the max rate if
1296 * this was a probe. Otherwise, ignore the probe.
1297 */
1298
1299 if (ath_rc_priv->probe_rate && ath_rc_priv->probe_rate == tx_rate) {
1300 if (retries > 0 || 2 * info_priv->n_bad_frames >
1301 info_priv->n_frames) {
1302 /*
1303 * Since we probed with just a single attempt,
1304 * any retries means the probe failed. Also,
1305 * if the attempt worked, but more than half
1306 * the subframes were bad then also consider
1307 * the probe a failure.
1308 */
1309 ath_rc_priv->probe_rate = 0;
1310 } else {
1311 u8 probe_rate = 0;
1312
1313 ath_rc_priv->rate_max_phy = ath_rc_priv->probe_rate;
1314 probe_rate = ath_rc_priv->probe_rate;
1315
1316 if (ath_rc_priv->state[probe_rate].per > 30)
1317 ath_rc_priv->state[probe_rate].per = 20;
1318
1319 ath_rc_priv->probe_rate = 0;
1320
1321 /*
1322 * Since this probe succeeded, we allow the next
1323 * probe twice as soon. This allows the maxRate
1324 * to move up faster if the probes are
1325 * succesful.
1326 */
1327 ath_rc_priv->probe_time = now_msec -
1328 rate_table->probe_interval / 2;
1329 }
1330 }
1331
1332 if (retries > 0) {
1333 /*
1334 * Don't update anything. We don't know if
1335 * this was because of collisions or poor signal.
1336 *
1337 * Later: if rssi_ack is close to
1338 * ath_rc_priv->state[txRate].rssi_thres and we see lots
1339 * of retries, then we could increase
1340 * ath_rc_priv->state[txRate].rssi_thres.
1341 */
1342 ath_rc_priv->hw_maxretry_pktcnt = 0;
1343 } else {
1344 /*
1345 * It worked with no retries. First ignore bogus (small)
1346 * rssi_ack values.
1347 */
1348 if (tx_rate == ath_rc_priv->rate_max_phy &&
1349 ath_rc_priv->hw_maxretry_pktcnt < 255) {
1350 ath_rc_priv->hw_maxretry_pktcnt++;
1351 }
1352
1353 if (info_priv->tx.ts_rssi >=
1354 rate_table->info[tx_rate].rssi_ack_validmin) {
1355 /* Average the rssi */
1356 if (tx_rate != ath_rc_priv->rssi_sum_rate) {
1357 ath_rc_priv->rssi_sum_rate = tx_rate;
1358 ath_rc_priv->rssi_sum =
1359 ath_rc_priv->rssi_sum_cnt = 0;
1360 }
1361
1362 ath_rc_priv->rssi_sum += info_priv->tx.ts_rssi;
1363 ath_rc_priv->rssi_sum_cnt++;
1364
1365 if (ath_rc_priv->rssi_sum_cnt > 4) {
1366 int32_t rssi_ackAvg =
1367 (ath_rc_priv->rssi_sum + 2) / 4;
1368 int8_t rssi_thres =
1369 ath_rc_priv->state[tx_rate].
1370 rssi_thres;
1371 int8_t rssi_ack_vmin =
1372 rate_table->info[tx_rate].
1373 rssi_ack_validmin;
1374
1375 ath_rc_priv->rssi_sum =
1376 ath_rc_priv->rssi_sum_cnt = 0;
1377
1378 /* Now reduce the current
1379 * rssi threshold. */
1380 if ((rssi_ackAvg < rssi_thres + 2) &&
1381 (rssi_thres > rssi_ack_vmin)) {
1382 ath_rc_priv->state[tx_rate].
1383 rssi_thres--;
1384 }
1385
1386 state_change = TRUE;
1387 }
1388 }
1389 }
1390 }
1391
1392 /* For all cases */
1393
1394 /*
1395 * If this rate looks bad (high PER) then stop using it for
1396 * a while (except if we are probing).
1397 */
1398 if (ath_rc_priv->state[tx_rate].per >= 55 && tx_rate > 0 &&
1399 rate_table->info[tx_rate].ratekbps <=
1400 rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
1401 ath_rc_get_nextlowervalid_txrate(rate_table, ath_rc_priv,
1402 (u8) tx_rate, &ath_rc_priv->rate_max_phy);
1403
1404 /* Don't probe for a little while. */
1405 ath_rc_priv->probe_time = now_msec;
1406 }
1407
1408 if (state_change) {
1409 /*
1410 * Make sure the rates above this have higher rssi thresholds.
1411 * (Note: Monotonicity is kept within the OFDM rates and
1412 * within the CCK rates. However, no adjustment is
1413 * made to keep the rssi thresholds monotonically
1414 * increasing between the CCK and OFDM rates.)
1415 */
1416 for (rate = tx_rate; rate <
1417 ath_rc_priv->rate_table_size - 1; rate++) {
1418 if (rate_table->info[rate+1].phy !=
1419 rate_table->info[tx_rate].phy)
1420 break;
1421
1422 if (ath_rc_priv->state[rate].rssi_thres +
1423 rate_table->info[rate].rssi_ack_deltamin >
1424 ath_rc_priv->state[rate+1].rssi_thres) {
1425 ath_rc_priv->state[rate+1].rssi_thres =
1426 ath_rc_priv->state[rate].
1427 rssi_thres +
1428 rate_table->info[rate].
1429 rssi_ack_deltamin;
1430 }
1431 }
1432
1433 /* Make sure the rates below this have lower rssi thresholds. */
1434 for (rate = tx_rate - 1; rate >= 0; rate--) {
1435 if (rate_table->info[rate].phy !=
1436 rate_table->info[tx_rate].phy)
1437 break;
1438
1439 if (ath_rc_priv->state[rate].rssi_thres +
1440 rate_table->info[rate].rssi_ack_deltamin >
1441 ath_rc_priv->state[rate+1].rssi_thres) {
1442 if (ath_rc_priv->state[rate+1].rssi_thres <
1443 rate_table->info[rate].
1444 rssi_ack_deltamin)
1445 ath_rc_priv->state[rate].rssi_thres = 0;
1446 else {
1447 ath_rc_priv->state[rate].rssi_thres =
1448 ath_rc_priv->state[rate+1].
1449 rssi_thres -
1450 rate_table->info[rate].
1451 rssi_ack_deltamin;
1452 }
1453
1454 if (ath_rc_priv->state[rate].rssi_thres <
1455 rate_table->info[rate].
1456 rssi_ack_validmin) {
1457 ath_rc_priv->state[rate].rssi_thres =
1458 rate_table->info[rate].
1459 rssi_ack_validmin;
1460 }
1461 }
1462 }
1463 }
1464
1465 /* Make sure the rates below this have lower PER */
1466 /* Monotonicity is kept only for rates below the current rate. */
1467 if (ath_rc_priv->state[tx_rate].per < last_per) {
1468 for (rate = tx_rate - 1; rate >= 0; rate--) {
1469 if (rate_table->info[rate].phy !=
1470 rate_table->info[tx_rate].phy)
1471 break;
1472
1473 if (ath_rc_priv->state[rate].per >
1474 ath_rc_priv->state[rate+1].per) {
1475 ath_rc_priv->state[rate].per =
1476 ath_rc_priv->state[rate+1].per;
1477 }
1478 }
1479 }
1480
1481 /* Maintain monotonicity for rates above the current rate */
1482 for (rate = tx_rate; rate < ath_rc_priv->rate_table_size - 1; rate++) {
1483 if (ath_rc_priv->state[rate+1].per < ath_rc_priv->state[rate].per)
1484 ath_rc_priv->state[rate+1].per =
1485 ath_rc_priv->state[rate].per;
1486 }
1487
1488 /* Every so often, we reduce the thresholds and
1489 * PER (different for CCK and OFDM). */
1490 if (now_msec - ath_rc_priv->rssi_down_time >=
1491 rate_table->rssi_reduce_interval) {
1492
1493 for (rate = 0; rate < ath_rc_priv->rate_table_size; rate++) {
1494 if (ath_rc_priv->state[rate].rssi_thres >
1495 rate_table->info[rate].rssi_ack_validmin)
1496 ath_rc_priv->state[rate].rssi_thres -= 1;
1497 }
1498 ath_rc_priv->rssi_down_time = now_msec;
1499 }
1500
1501 /* Every so often, we reduce the thresholds
1502 * and PER (different for CCK and OFDM). */
1503 if (now_msec - ath_rc_priv->per_down_time >=
1504 rate_table->rssi_reduce_interval) {
1505 for (rate = 0; rate < ath_rc_priv->rate_table_size; rate++) {
1506 ath_rc_priv->state[rate].per =
1507 7 * ath_rc_priv->state[rate].per / 8;
1508 }
1509
1510 ath_rc_priv->per_down_time = now_msec;
1511 }
1512 }
1513
1514 /*
1515 * This routine is called in rate control callback tx_status() to give
1516 * the status of previous frames.
1517 */
1518 static void ath_rc_update(struct ath_softc *sc,
1519 struct ath_rate_node *ath_rc_priv,
1520 struct ath_tx_info_priv *info_priv, int final_ts_idx,
1521 int xretries, int long_retry)
1522 {
1523 struct ath_rate_softc *asc = (struct ath_rate_softc *)sc->sc_rc;
1524 struct ath_rate_table *rate_table;
1525 struct ath_rc_series rcs[4];
1526 u8 flags;
1527 u32 series = 0, rix;
1528
1529 memcpy(rcs, info_priv->rcs, 4 * sizeof(rcs[0]));
1530 rate_table = (struct ath_rate_table *)
1531 asc->hw_rate_table[sc->sc_curmode];
1532 ASSERT(rcs[0].tries != 0);
1533
1534 /*
1535 * If the first rate is not the final index, there
1536 * are intermediate rate failures to be processed.
1537 */
1538 if (final_ts_idx != 0) {
1539 /* Process intermediate rates that failed.*/
1540 for (series = 0; series < final_ts_idx ; series++) {
1541 if (rcs[series].tries != 0) {
1542 flags = rcs[series].flags;
1543 /* If HT40 and we have switched mode from
1544 * 40 to 20 => don't update */
1545 if ((flags & ATH_RC_CW40_FLAG) &&
1546 (ath_rc_priv->rc_phy_mode !=
1547 (flags & ATH_RC_CW40_FLAG)))
1548 return;
1549 if ((flags & ATH_RC_CW40_FLAG) &&
1550 (flags & ATH_RC_SGI_FLAG))
1551 rix = rate_table->info[
1552 rcs[series].rix].ht_index;
1553 else if (flags & ATH_RC_SGI_FLAG)
1554 rix = rate_table->info[
1555 rcs[series].rix].sgi_index;
1556 else if (flags & ATH_RC_CW40_FLAG)
1557 rix = rate_table->info[
1558 rcs[series].rix].cw40index;
1559 else
1560 rix = rate_table->info[
1561 rcs[series].rix].base_index;
1562 ath_rc_update_ht(sc, ath_rc_priv,
1563 info_priv, rix,
1564 xretries ? 1 : 2,
1565 rcs[series].tries);
1566 }
1567 }
1568 } else {
1569 /*
1570 * Handle the special case of MIMO PS burst, where the second
1571 * aggregate is sent out with only one rate and one try.
1572 * Treating it as an excessive retry penalizes the rate
1573 * inordinately.
1574 */
1575 if (rcs[0].tries == 1 && xretries == 1)
1576 xretries = 2;
1577 }
1578
1579 flags = rcs[series].flags;
1580 /* If HT40 and we have switched mode from 40 to 20 => don't update */
1581 if ((flags & ATH_RC_CW40_FLAG) &&
1582 (ath_rc_priv->rc_phy_mode != (flags & ATH_RC_CW40_FLAG)))
1583 return;
1584
1585 if ((flags & ATH_RC_CW40_FLAG) && (flags & ATH_RC_SGI_FLAG))
1586 rix = rate_table->info[rcs[series].rix].ht_index;
1587 else if (flags & ATH_RC_SGI_FLAG)
1588 rix = rate_table->info[rcs[series].rix].sgi_index;
1589 else if (flags & ATH_RC_CW40_FLAG)
1590 rix = rate_table->info[rcs[series].rix].cw40index;
1591 else
1592 rix = rate_table->info[rcs[series].rix].base_index;
1593
1594 ath_rc_update_ht(sc, ath_rc_priv, info_priv, rix,
1595 xretries, long_retry);
1596 }
1597
1598 /*
1599 * Process a tx descriptor for a completed transmit (success or failure).
1600 */
1601 static void ath_rate_tx_complete(struct ath_softc *sc,
1602 struct ath_node *an,
1603 struct ath_rate_node *rc_priv,
1604 struct ath_tx_info_priv *info_priv)
1605 {
1606 int final_ts_idx = info_priv->tx.ts_rateindex;
1607 int tx_status = 0, is_underrun = 0;
1608 struct ath_vap *avp;
1609
1610 avp = rc_priv->avp;
1611 if ((avp->av_config.av_fixed_rateset != IEEE80211_FIXED_RATE_NONE) ||
1612 (info_priv->tx.ts_status & ATH9K_TXERR_FILT))
1613 return;
1614
1615 if (info_priv->tx.ts_rssi > 0) {
1616 ATH_RSSI_LPF(an->an_chainmask_sel.tx_avgrssi,
1617 info_priv->tx.ts_rssi);
1618 }
1619
1620 /*
1621 * If underrun error is seen assume it as an excessive retry only
1622 * if prefetch trigger level have reached the max (0x3f for 5416)
1623 * Adjust the long retry as if the frame was tried ATH_11N_TXMAXTRY
1624 * times. This affects how ratectrl updates PER for the failed rate.
1625 */
1626 if (info_priv->tx.ts_flags &
1627 (ATH9K_TX_DATA_UNDERRUN | ATH9K_TX_DELIM_UNDERRUN) &&
1628 ((sc->sc_ah->ah_txTrigLevel) >= tx_triglevel_max)) {
1629 tx_status = 1;
1630 is_underrun = 1;
1631 }
1632
1633 if ((info_priv->tx.ts_status & ATH9K_TXERR_XRETRY) ||
1634 (info_priv->tx.ts_status & ATH9K_TXERR_FIFO))
1635 tx_status = 1;
1636
1637 ath_rc_update(sc, rc_priv, info_priv, final_ts_idx, tx_status,
1638 (is_underrun) ? ATH_11N_TXMAXTRY :
1639 info_priv->tx.ts_longretry);
1640 }
1641
1642 /*
1643 * Update the SIB's rate control information
1644 *
1645 * This should be called when the supported rates change
1646 * (e.g. SME operation, wireless mode change)
1647 *
1648 * It will determine which rates are valid for use.
1649 */
1650 static void ath_rc_sib_update(struct ath_softc *sc,
1651 struct ath_rate_node *ath_rc_priv,
1652 u32 capflag, int keep_state,
1653 struct ath_rateset *negotiated_rates,
1654 struct ath_rateset *negotiated_htrates)
1655 {
1656 struct ath_rate_table *rate_table = NULL;
1657 struct ath_rate_softc *asc = (struct ath_rate_softc *)sc->sc_rc;
1658 struct ath_rateset *rateset = negotiated_rates;
1659 u8 *ht_mcs = (u8 *)negotiated_htrates;
1660 u8 i, j, k, hi = 0, hthi = 0;
1661
1662 rate_table = (struct ath_rate_table *)
1663 asc->hw_rate_table[sc->sc_curmode];
1664
1665 /* Initial rate table size. Will change depending
1666 * on the working rate set */
1667 ath_rc_priv->rate_table_size = MAX_TX_RATE_TBL;
1668
1669 /* Initialize thresholds according to the global rate table */
1670 for (i = 0 ; (i < ath_rc_priv->rate_table_size) && (!keep_state); i++) {
1671 ath_rc_priv->state[i].rssi_thres =
1672 rate_table->info[i].rssi_ack_validmin;
1673 ath_rc_priv->state[i].per = 0;
1674 }
1675
1676 /* Determine the valid rates */
1677 ath_rc_init_valid_txmask(ath_rc_priv);
1678
1679 for (i = 0; i < WLAN_RC_PHY_MAX; i++) {
1680 for (j = 0; j < MAX_TX_RATE_PHY; j++)
1681 ath_rc_priv->valid_phy_rateidx[i][j] = 0;
1682 ath_rc_priv->valid_phy_ratecnt[i] = 0;
1683 }
1684 ath_rc_priv->rc_phy_mode = (capflag & WLAN_RC_40_FLAG);
1685
1686 /* Set stream capability */
1687 ath_rc_priv->single_stream = (capflag & WLAN_RC_DS_FLAG) ? 0 : 1;
1688
1689 if (!rateset->rs_nrates) {
1690 /* No working rate, just initialize valid rates */
1691 hi = ath_rc_sib_init_validrates(ath_rc_priv, rate_table,
1692 capflag);
1693 } else {
1694 /* Use intersection of working rates and valid rates */
1695 hi = ath_rc_sib_setvalid_rates(ath_rc_priv, rate_table,
1696 rateset, capflag);
1697 if (capflag & WLAN_RC_HT_FLAG) {
1698 hthi = ath_rc_sib_setvalid_htrates(ath_rc_priv,
1699 rate_table,
1700 ht_mcs,
1701 capflag);
1702 }
1703 hi = A_MAX(hi, hthi);
1704 }
1705
1706 ath_rc_priv->rate_table_size = hi + 1;
1707 ath_rc_priv->rate_max_phy = 0;
1708 ASSERT(ath_rc_priv->rate_table_size <= MAX_TX_RATE_TBL);
1709
1710 for (i = 0, k = 0; i < WLAN_RC_PHY_MAX; i++) {
1711 for (j = 0; j < ath_rc_priv->valid_phy_ratecnt[i]; j++) {
1712 ath_rc_priv->valid_rate_index[k++] =
1713 ath_rc_priv->valid_phy_rateidx[i][j];
1714 }
1715
1716 if (!ath_rc_valid_phyrate(i, rate_table->initial_ratemax, TRUE)
1717 || !ath_rc_priv->valid_phy_ratecnt[i])
1718 continue;
1719
1720 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_phy_rateidx[i][j-1];
1721 }
1722 ASSERT(ath_rc_priv->rate_table_size <= MAX_TX_RATE_TBL);
1723 ASSERT(k <= MAX_TX_RATE_TBL);
1724
1725 ath_rc_priv->max_valid_rate = k;
1726 /*
1727 * Some third party vendors don't send the supported rate series in
1728 * order. So sorting to make sure its in order, otherwise our RateFind
1729 * Algo will select wrong rates
1730 */
1731 ath_rc_sort_validrates(rate_table, ath_rc_priv);
1732 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
1733 }
1734
1735 /*
1736 * Update rate-control state on station associate/reassociate.
1737 */
1738 static int ath_rate_newassoc(struct ath_softc *sc,
1739 struct ath_rate_node *ath_rc_priv,
1740 unsigned int capflag,
1741 struct ath_rateset *negotiated_rates,
1742 struct ath_rateset *negotiated_htrates)
1743 {
1744
1745
1746 ath_rc_priv->ht_cap =
1747 ((capflag & ATH_RC_DS_FLAG) ? WLAN_RC_DS_FLAG : 0) |
1748 ((capflag & ATH_RC_SGI_FLAG) ? WLAN_RC_SGI_FLAG : 0) |
1749 ((capflag & ATH_RC_HT_FLAG) ? WLAN_RC_HT_FLAG : 0) |
1750 ((capflag & ATH_RC_CW40_FLAG) ? WLAN_RC_40_FLAG : 0);
1751
1752 ath_rc_sib_update(sc, ath_rc_priv, ath_rc_priv->ht_cap, 0,
1753 negotiated_rates, negotiated_htrates);
1754
1755 return 0;
1756 }
1757
1758 static void ath_setup_rates(struct ath_softc *sc,
1759 struct ieee80211_supported_band *sband,
1760 struct ieee80211_sta *sta,
1761 struct ath_rate_node *rc_priv)
1762
1763 {
1764 int i, j = 0;
1765
1766 DPRINTF(sc, ATH_DBG_RATE, "%s\n", __func__);
1767
1768 for (i = 0; i < sband->n_bitrates; i++) {
1769 if (sta->supp_rates[sband->band] & BIT(i)) {
1770 rc_priv->neg_rates.rs_rates[j]
1771 = (sband->bitrates[i].bitrate * 2) / 10;
1772 j++;
1773 }
1774 }
1775 rc_priv->neg_rates.rs_nrates = j;
1776 }
1777
1778 void ath_rc_node_update(struct ieee80211_hw *hw, struct ath_rate_node *rc_priv)
1779 {
1780 struct ath_softc *sc = hw->priv;
1781 u32 capflag = 0;
1782
1783 if (hw->conf.ht.enabled) {
1784 capflag |= ATH_RC_HT_FLAG | ATH_RC_DS_FLAG;
1785 if (sc->sc_ht_info.tx_chan_width == ATH9K_HT_MACMODE_2040)
1786 capflag |= ATH_RC_CW40_FLAG;
1787 }
1788
1789 ath_rate_newassoc(sc, rc_priv, capflag,
1790 &rc_priv->neg_rates,
1791 &rc_priv->neg_ht_rates);
1792
1793 }
1794
1795 /* Rate Control callbacks */
1796 static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
1797 struct ieee80211_sta *sta, void *priv_sta,
1798 struct sk_buff *skb)
1799 {
1800 struct ath_softc *sc = priv;
1801 struct ath_tx_info_priv *tx_info_priv;
1802 struct ath_node *an;
1803 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1804 struct ieee80211_hdr *hdr;
1805 __le16 fc;
1806
1807 hdr = (struct ieee80211_hdr *)skb->data;
1808 fc = hdr->frame_control;
1809 /* XXX: UGLY HACK!! */
1810 tx_info_priv = (struct ath_tx_info_priv *)tx_info->control.vif;
1811
1812 an = (struct ath_node *)sta->drv_priv;
1813
1814 if (tx_info_priv == NULL)
1815 return;
1816
1817 if (an && priv_sta && ieee80211_is_data(fc))
1818 ath_rate_tx_complete(sc, an, priv_sta, tx_info_priv);
1819
1820 kfree(tx_info_priv);
1821 tx_info->control.vif = NULL;
1822 }
1823
1824 static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
1825 struct ieee80211_tx_rate_control *txrc)
1826 {
1827 struct ieee80211_supported_band *sband = txrc->sband;
1828 struct sk_buff *skb = txrc->skb;
1829 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1830 struct ath_softc *sc = priv;
1831 struct ieee80211_hw *hw = sc->hw;
1832 struct ath_tx_info_priv *tx_info_priv;
1833 struct ath_rate_node *ath_rc_priv = priv_sta;
1834 struct ath_node *an;
1835 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1836 int is_probe = FALSE;
1837 s8 lowest_idx;
1838 __le16 fc = hdr->frame_control;
1839 u8 *qc, tid;
1840
1841 DPRINTF(sc, ATH_DBG_RATE, "%s\n", __func__);
1842
1843 /* allocate driver private area of tx_info, XXX: UGLY HACK! */
1844 tx_info->control.vif = kzalloc(sizeof(*tx_info_priv), GFP_ATOMIC);
1845 tx_info_priv = (struct ath_tx_info_priv *)tx_info->control.vif;
1846 ASSERT(tx_info_priv != NULL);
1847
1848 lowest_idx = rate_lowest_index(sband, sta);
1849 tx_info_priv->min_rate = (sband->bitrates[lowest_idx].bitrate * 2) / 10;
1850 /* lowest rate for management and multicast/broadcast frames */
1851 if (!ieee80211_is_data(fc) ||
1852 is_multicast_ether_addr(hdr->addr1) || !sta) {
1853 tx_info->control.rates[0].idx = lowest_idx;
1854 return;
1855 }
1856
1857 /* Find tx rate for unicast frames */
1858 ath_rate_findrate(sc, ath_rc_priv,
1859 ATH_11N_TXMAXTRY, 4,
1860 ATH_RC_PROBE_ALLOWED,
1861 tx_info_priv->rcs,
1862 &is_probe,
1863 false);
1864 #if 0
1865 if (is_probe)
1866 sel->probe_idx = ath_rc_priv->tx_ratectrl.probe_rate;
1867 #endif
1868
1869 /* Ratecontrol sometimes returns invalid rate index */
1870 if (tx_info_priv->rcs[0].rix != 0xff)
1871 ath_rc_priv->prev_data_rix = tx_info_priv->rcs[0].rix;
1872 else
1873 tx_info_priv->rcs[0].rix = ath_rc_priv->prev_data_rix;
1874
1875 tx_info->control.rates[0].idx = tx_info_priv->rcs[0].rix;
1876
1877 /* Check if aggregation has to be enabled for this tid */
1878
1879 if (hw->conf.ht.enabled) {
1880 if (ieee80211_is_data_qos(fc)) {
1881 qc = ieee80211_get_qos_ctl(hdr);
1882 tid = qc[0] & 0xf;
1883 an = (struct ath_node *)sta->drv_priv;
1884
1885 if(ath_tx_aggr_check(sc, an, tid))
1886 ieee80211_start_tx_ba_session(hw, hdr->addr1, tid);
1887 }
1888 }
1889 }
1890
1891 static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
1892 struct ieee80211_sta *sta, void *priv_sta)
1893 {
1894 struct ath_softc *sc = priv;
1895 struct ath_rate_node *ath_rc_priv = priv_sta;
1896 int i, j = 0;
1897
1898 DPRINTF(sc, ATH_DBG_RATE, "%s\n", __func__);
1899
1900 ath_setup_rates(sc, sband, sta, ath_rc_priv);
1901 if (sta->ht_cap.ht_supported) {
1902 for (i = 0; i < 77; i++) {
1903 if (sta->ht_cap.mcs.rx_mask[i/8] & (1<<(i%8)))
1904 ath_rc_priv->neg_ht_rates.rs_rates[j++] = i;
1905 if (j == ATH_RATE_MAX)
1906 break;
1907 }
1908 ath_rc_priv->neg_ht_rates.rs_nrates = j;
1909 }
1910 ath_rc_node_update(sc->hw, priv_sta);
1911 }
1912
1913 static void *ath_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
1914 {
1915 struct ath_softc *sc = hw->priv;
1916
1917 DPRINTF(sc, ATH_DBG_RATE, "%s\n", __func__);
1918 return hw->priv;
1919 }
1920
1921 static void ath_rate_free(void *priv)
1922 {
1923 return;
1924 }
1925
1926 static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
1927 {
1928 struct ieee80211_vif *vif;
1929 struct ath_softc *sc = priv;
1930 struct ath_vap *avp;
1931 struct ath_rate_node *rate_priv;
1932
1933 vif = sc->sc_vaps[0];
1934 ASSERT(vif);
1935
1936 avp = (void *)vif->drv_priv;
1937
1938 rate_priv = kzalloc(sizeof(struct ath_rate_node), gfp);
1939 if (!rate_priv) {
1940 DPRINTF(sc, ATH_DBG_FATAL,
1941 "%s: Unable to allocate private rc structure\n",
1942 __func__);
1943 return NULL;
1944 }
1945
1946 rate_priv->avp = avp;
1947 rate_priv->asc = sc->sc_rc;
1948 avp->rc_node = rate_priv;
1949 rate_priv->rssi_down_time = jiffies_to_msecs(jiffies);
1950
1951 return rate_priv;
1952 }
1953
1954 static void ath_rate_free_sta(void *priv, struct ieee80211_sta *sta,
1955 void *priv_sta)
1956 {
1957 struct ath_rate_node *rate_priv = priv_sta;
1958
1959 kfree(rate_priv);
1960 }
1961
1962 static struct rate_control_ops ath_rate_ops = {
1963 .module = NULL,
1964 .name = "ath9k_rate_control",
1965 .tx_status = ath_tx_status,
1966 .get_rate = ath_get_rate,
1967 .rate_init = ath_rate_init,
1968 .alloc = ath_rate_alloc,
1969 .free = ath_rate_free,
1970 .alloc_sta = ath_rate_alloc_sta,
1971 .free_sta = ath_rate_free_sta,
1972 };
1973
1974 int ath_rate_control_register(void)
1975 {
1976 return ieee80211_rate_control_register(&ath_rate_ops);
1977 }
1978
1979 void ath_rate_control_unregister(void)
1980 {
1981 ieee80211_rate_control_unregister(&ath_rate_ops);
1982 }
1983
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree