2 * Copyright (c) 2004 Video54 Technologies, Inc.
3 * Copyright (c) 2004-2009 Atheros Communications, Inc.
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.
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.
18 #include <linux/slab.h>
22 static const struct ath_rate_table ar5416_11na_ratetable = {
26 { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
27 5400, 0, 12, 0, 0, 0, 0, 0 },
28 { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
29 7800, 1, 18, 0, 1, 1, 1, 1 },
30 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
31 10000, 2, 24, 2, 2, 2, 2, 2 },
32 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
33 13900, 3, 36, 2, 3, 3, 3, 3 },
34 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
35 17300, 4, 48, 4, 4, 4, 4, 4 },
36 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
37 23000, 5, 72, 4, 5, 5, 5, 5 },
38 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
39 27400, 6, 96, 4, 6, 6, 6, 6 },
40 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
41 29300, 7, 108, 4, 7, 7, 7, 7 },
42 { VALID_2040, VALID_2040, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
43 6400, 0, 0, 0, 8, 24, 8, 24 },
44 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
45 12700, 1, 1, 2, 9, 25, 9, 25 },
46 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
47 18800, 2, 2, 2, 10, 26, 10, 26 },
48 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
49 25000, 3, 3, 4, 11, 27, 11, 27 },
50 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
51 36700, 4, 4, 4, 12, 28, 12, 28 },
52 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
53 48100, 5, 5, 4, 13, 29, 13, 29 },
54 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
55 53500, 6, 6, 4, 14, 30, 14, 30 },
56 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
57 59000, 7, 7, 4, 15, 31, 15, 32 },
58 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
59 12700, 8, 8, 3, 16, 33, 16, 33 },
60 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
61 24800, 9, 9, 2, 17, 34, 17, 34 },
62 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
63 36600, 10, 10, 2, 18, 35, 18, 35 },
64 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
65 48100, 11, 11, 4, 19, 36, 19, 36 },
66 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
67 69500, 12, 12, 4, 20, 37, 20, 37 },
68 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
69 89500, 13, 13, 4, 21, 38, 21, 38 },
70 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
71 98900, 14, 14, 4, 22, 39, 22, 39 },
72 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
73 108300, 15, 15, 4, 23, 40, 23, 41 },
74 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
75 13200, 0, 0, 0, 8, 24, 24, 24 },
76 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
77 25900, 1, 1, 2, 9, 25, 25, 25 },
78 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
79 38600, 2, 2, 2, 10, 26, 26, 26 },
80 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
81 49800, 3, 3, 4, 11, 27, 27, 27 },
82 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
83 72200, 4, 4, 4, 12, 28, 28, 28 },
84 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
85 92900, 5, 5, 4, 13, 29, 29, 29 },
86 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
87 102700, 6, 6, 4, 14, 30, 30, 30 },
88 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
89 112000, 7, 7, 4, 15, 31, 32, 32 },
90 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
91 122000, 7, 7, 4, 15, 31, 32, 32 },
92 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
93 25800, 8, 8, 0, 16, 33, 33, 33 },
94 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
95 49800, 9, 9, 2, 17, 34, 34, 34 },
96 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
97 71900, 10, 10, 2, 18, 35, 35, 35 },
98 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
99 92500, 11, 11, 4, 19, 36, 36, 36 },
100 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
101 130300, 12, 12, 4, 20, 37, 37, 37 },
102 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
103 162800, 13, 13, 4, 21, 38, 38, 38 },
104 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
105 178200, 14, 14, 4, 22, 39, 39, 39 },
106 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
107 192100, 15, 15, 4, 23, 40, 41, 41 },
108 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
109 207000, 15, 15, 4, 23, 40, 41, 41 },
111 50, /* probe interval */
112 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
115 /* 4ms frame limit not used for NG mode. The values filled
116 * for HT are the 64K max aggregate limit */
118 static const struct ath_rate_table ar5416_11ng_ratetable = {
122 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
123 900, 0, 2, 0, 0, 0, 0, 0 },
124 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
125 1900, 1, 4, 1, 1, 1, 1, 1 },
126 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
127 4900, 2, 11, 2, 2, 2, 2, 2 },
128 { VALID_ALL, VALID_ALL, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
129 8100, 3, 22, 3, 3, 3, 3, 3 },
130 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
131 5400, 4, 12, 4, 4, 4, 4, 4 },
132 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
133 7800, 5, 18, 4, 5, 5, 5, 5 },
134 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
135 10100, 6, 24, 6, 6, 6, 6, 6 },
136 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
137 14100, 7, 36, 6, 7, 7, 7, 7 },
138 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
139 17700, 8, 48, 8, 8, 8, 8, 8 },
140 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
141 23700, 9, 72, 8, 9, 9, 9, 9 },
142 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
143 27400, 10, 96, 8, 10, 10, 10, 10 },
144 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
145 30900, 11, 108, 8, 11, 11, 11, 11 },
146 { INVALID, INVALID, WLAN_RC_PHY_HT_20_SS, 6500, /* 6.5 Mb */
147 6400, 0, 0, 4, 12, 28, 12, 28 },
148 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 13000, /* 13 Mb */
149 12700, 1, 1, 6, 13, 29, 13, 29 },
150 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 19500, /* 19.5 Mb */
151 18800, 2, 2, 6, 14, 30, 14, 30 },
152 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 26000, /* 26 Mb */
153 25000, 3, 3, 8, 15, 31, 15, 31 },
154 { VALID_20, VALID_20, WLAN_RC_PHY_HT_20_SS, 39000, /* 39 Mb */
155 36700, 4, 4, 8, 16, 32, 16, 32 },
156 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 52000, /* 52 Mb */
157 48100, 5, 5, 8, 17, 33, 17, 33 },
158 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 58500, /* 58.5 Mb */
159 53500, 6, 6, 8, 18, 34, 18, 34 },
160 { INVALID, VALID_20, WLAN_RC_PHY_HT_20_SS, 65000, /* 65 Mb */
161 59000, 7, 7, 8, 19, 35, 19, 36 },
162 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 13000, /* 13 Mb */
163 12700, 8, 8, 4, 20, 37, 20, 37 },
164 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 26000, /* 26 Mb */
165 24800, 9, 9, 6, 21, 38, 21, 38 },
166 { INVALID, INVALID, WLAN_RC_PHY_HT_20_DS, 39000, /* 39 Mb */
167 36600, 10, 10, 6, 22, 39, 22, 39 },
168 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 52000, /* 52 Mb */
169 48100, 11, 11, 8, 23, 40, 23, 40 },
170 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 78000, /* 78 Mb */
171 69500, 12, 12, 8, 24, 41, 24, 41 },
172 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 104000, /* 104 Mb */
173 89500, 13, 13, 8, 25, 42, 25, 42 },
174 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 117000, /* 117 Mb */
175 98900, 14, 14, 8, 26, 43, 26, 44 },
176 { VALID_20, INVALID, WLAN_RC_PHY_HT_20_DS, 130000, /* 130 Mb */
177 108300, 15, 15, 8, 27, 44, 27, 45 },
178 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 13500, /* 13.5 Mb */
179 13200, 0, 0, 8, 12, 28, 28, 28 },
180 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 27500, /* 27.0 Mb */
181 25900, 1, 1, 8, 13, 29, 29, 29 },
182 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 40500, /* 40.5 Mb */
183 38600, 2, 2, 8, 14, 30, 30, 30 },
184 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 54000, /* 54 Mb */
185 49800, 3, 3, 8, 15, 31, 31, 31 },
186 { VALID_40, VALID_40, WLAN_RC_PHY_HT_40_SS, 81500, /* 81 Mb */
187 72200, 4, 4, 8, 16, 32, 32, 32 },
188 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 108000, /* 108 Mb */
189 92900, 5, 5, 8, 17, 33, 33, 33 },
190 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 121500, /* 121.5 Mb */
191 102700, 6, 6, 8, 18, 34, 34, 34 },
192 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS, 135000, /* 135 Mb */
193 112000, 7, 7, 8, 19, 35, 36, 36 },
194 { INVALID, VALID_40, WLAN_RC_PHY_HT_40_SS_HGI, 150000, /* 150 Mb */
195 122000, 7, 7, 8, 19, 35, 36, 36 },
196 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 27000, /* 27 Mb */
197 25800, 8, 8, 8, 20, 37, 37, 37 },
198 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 54000, /* 54 Mb */
199 49800, 9, 9, 8, 21, 38, 38, 38 },
200 { INVALID, INVALID, WLAN_RC_PHY_HT_40_DS, 81000, /* 81 Mb */
201 71900, 10, 10, 8, 22, 39, 39, 39 },
202 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 108000, /* 108 Mb */
203 92500, 11, 11, 8, 23, 40, 40, 40 },
204 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 162000, /* 162 Mb */
205 130300, 12, 12, 8, 24, 41, 41, 41 },
206 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 216000, /* 216 Mb */
207 162800, 13, 13, 8, 25, 42, 42, 42 },
208 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 243000, /* 243 Mb */
209 178200, 14, 14, 8, 26, 43, 43, 43 },
210 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS, 270000, /* 270 Mb */
211 192100, 15, 15, 8, 27, 44, 45, 45 },
212 { VALID_40, INVALID, WLAN_RC_PHY_HT_40_DS_HGI, 300000, /* 300 Mb */
213 207000, 15, 15, 8, 27, 44, 45, 45 },
215 50, /* probe interval */
216 WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
219 static const struct ath_rate_table ar5416_11a_ratetable = {
223 { VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
224 5400, 0, 12, 0, 0, 0 },
225 { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
226 7800, 1, 18, 0, 1, 0 },
227 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
228 10000, 2, 24, 2, 2, 0 },
229 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
230 13900, 3, 36, 2, 3, 0 },
231 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
232 17300, 4, 48, 4, 4, 0 },
233 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
234 23000, 5, 72, 4, 5, 0 },
235 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
236 27400, 6, 96, 4, 6, 0 },
237 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
238 29300, 7, 108, 4, 7, 0 },
240 50, /* probe interval */
241 0, /* Phy rates allowed initially */
244 static const struct ath_rate_table ar5416_11g_ratetable = {
248 { VALID, VALID, WLAN_RC_PHY_CCK, 1000, /* 1 Mb */
249 900, 0, 2, 0, 0, 0 },
250 { VALID, VALID, WLAN_RC_PHY_CCK, 2000, /* 2 Mb */
251 1900, 1, 4, 1, 1, 0 },
252 { VALID, VALID, WLAN_RC_PHY_CCK, 5500, /* 5.5 Mb */
253 4900, 2, 11, 2, 2, 0 },
254 { VALID, VALID, WLAN_RC_PHY_CCK, 11000, /* 11 Mb */
255 8100, 3, 22, 3, 3, 0 },
256 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
257 5400, 4, 12, 4, 4, 0 },
258 { INVALID, INVALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
259 7800, 5, 18, 4, 5, 0 },
260 { VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
261 10000, 6, 24, 6, 6, 0 },
262 { VALID, VALID, WLAN_RC_PHY_OFDM, 18000, /* 18 Mb */
263 13900, 7, 36, 6, 7, 0 },
264 { VALID, VALID, WLAN_RC_PHY_OFDM, 24000, /* 24 Mb */
265 17300, 8, 48, 8, 8, 0 },
266 { VALID, VALID, WLAN_RC_PHY_OFDM, 36000, /* 36 Mb */
267 23000, 9, 72, 8, 9, 0 },
268 { VALID, VALID, WLAN_RC_PHY_OFDM, 48000, /* 48 Mb */
269 27400, 10, 96, 8, 10, 0 },
270 { VALID, VALID, WLAN_RC_PHY_OFDM, 54000, /* 54 Mb */
271 29300, 11, 108, 8, 11, 0 },
273 50, /* probe interval */
274 0, /* Phy rates allowed initially */
277 static const struct ath_rate_table *hw_rate_table[ATH9K_MODE_MAX] = {
278 [ATH9K_MODE_11A] = &ar5416_11a_ratetable,
279 [ATH9K_MODE_11G] = &ar5416_11g_ratetable,
280 [ATH9K_MODE_11NA_HT20] = &ar5416_11na_ratetable,
281 [ATH9K_MODE_11NG_HT20] = &ar5416_11ng_ratetable,
282 [ATH9K_MODE_11NA_HT40PLUS] = &ar5416_11na_ratetable,
283 [ATH9K_MODE_11NA_HT40MINUS] = &ar5416_11na_ratetable,
284 [ATH9K_MODE_11NG_HT40PLUS] = &ar5416_11ng_ratetable,
285 [ATH9K_MODE_11NG_HT40MINUS] = &ar5416_11ng_ratetable,
288 static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
289 struct ieee80211_tx_rate *rate);
291 static inline int8_t median(int8_t a, int8_t b, int8_t c)
310 static void ath_rc_sort_validrates(const struct ath_rate_table *rate_table,
311 struct ath_rate_priv *ath_rc_priv)
313 u8 i, j, idx, idx_next;
315 for (i = ath_rc_priv->max_valid_rate - 1; i > 0; i--) {
316 for (j = 0; j <= i-1; j++) {
317 idx = ath_rc_priv->valid_rate_index[j];
318 idx_next = ath_rc_priv->valid_rate_index[j+1];
320 if (rate_table->info[idx].ratekbps >
321 rate_table->info[idx_next].ratekbps) {
322 ath_rc_priv->valid_rate_index[j] = idx_next;
323 ath_rc_priv->valid_rate_index[j+1] = idx;
329 static void ath_rc_init_valid_txmask(struct ath_rate_priv *ath_rc_priv)
333 for (i = 0; i < ath_rc_priv->rate_table_size; i++)
334 ath_rc_priv->valid_rate_index[i] = 0;
337 static inline void ath_rc_set_valid_txmask(struct ath_rate_priv *ath_rc_priv,
338 u8 index, int valid_tx_rate)
340 BUG_ON(index > ath_rc_priv->rate_table_size);
341 ath_rc_priv->valid_rate_index[index] = valid_tx_rate ? 1 : 0;
345 int ath_rc_get_nextvalid_txrate(const struct ath_rate_table *rate_table,
346 struct ath_rate_priv *ath_rc_priv,
352 for (i = 0; i < ath_rc_priv->max_valid_rate - 1; i++) {
353 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
354 *next_idx = ath_rc_priv->valid_rate_index[i+1];
359 /* No more valid rates */
365 /* Return true only for single stream */
367 static int ath_rc_valid_phyrate(u32 phy, u32 capflag, int ignore_cw)
369 if (WLAN_RC_PHY_HT(phy) && !(capflag & WLAN_RC_HT_FLAG))
371 if (WLAN_RC_PHY_DS(phy) && !(capflag & WLAN_RC_DS_FLAG))
373 if (WLAN_RC_PHY_SGI(phy) && !(capflag & WLAN_RC_SGI_FLAG))
375 if (!ignore_cw && WLAN_RC_PHY_HT(phy))
376 if (WLAN_RC_PHY_40(phy) && !(capflag & WLAN_RC_40_FLAG))
382 ath_rc_get_lower_rix(const struct ath_rate_table *rate_table,
383 struct ath_rate_priv *ath_rc_priv,
384 u8 cur_valid_txrate, u8 *next_idx)
388 for (i = 1; i < ath_rc_priv->max_valid_rate ; i++) {
389 if (ath_rc_priv->valid_rate_index[i] == cur_valid_txrate) {
390 *next_idx = ath_rc_priv->valid_rate_index[i-1];
398 static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
399 const struct ath_rate_table *rate_table,
405 for (i = 0; i < rate_table->rate_cnt; i++) {
406 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
407 rate_table->info[i].valid_single_stream :
408 rate_table->info[i].valid);
410 u32 phy = rate_table->info[i].phy;
411 u8 valid_rate_count = 0;
413 if (!ath_rc_valid_phyrate(phy, capflag, 0))
416 valid_rate_count = ath_rc_priv->valid_phy_ratecnt[phy];
418 ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = i;
419 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
420 ath_rc_set_valid_txmask(ath_rc_priv, i, 1);
428 static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
429 const struct ath_rate_table *rate_table,
430 struct ath_rateset *rateset,
435 /* Use intersection of working rates and valid rates */
436 for (i = 0; i < rateset->rs_nrates; i++) {
437 for (j = 0; j < rate_table->rate_cnt; j++) {
438 u32 phy = rate_table->info[j].phy;
439 u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
440 rate_table->info[j].valid_single_stream :
441 rate_table->info[j].valid);
442 u8 rate = rateset->rs_rates[i];
443 u8 dot11rate = rate_table->info[j].dot11rate;
445 /* We allow a rate only if its valid and the
446 * capflag matches one of the validity
447 * (VALID/VALID_20/VALID_40) flags */
449 if ((rate == dot11rate) &&
450 ((valid & WLAN_RC_CAP_MODE(capflag)) ==
451 WLAN_RC_CAP_MODE(capflag)) &&
452 !WLAN_RC_PHY_HT(phy)) {
453 u8 valid_rate_count = 0;
455 if (!ath_rc_valid_phyrate(phy, capflag, 0))
459 ath_rc_priv->valid_phy_ratecnt[phy];
461 ath_rc_priv->valid_phy_rateidx[phy]
462 [valid_rate_count] = j;
463 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
464 ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
473 static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
474 const struct ath_rate_table *rate_table,
475 u8 *mcs_set, u32 capflag)
477 struct ath_rateset *rateset = (struct ath_rateset *)mcs_set;
481 /* Use intersection of working rates and valid rates */
482 for (i = 0; i < rateset->rs_nrates; i++) {
483 for (j = 0; j < rate_table->rate_cnt; j++) {
484 u32 phy = rate_table->info[j].phy;
485 u32 valid = (!(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG) ?
486 rate_table->info[j].valid_single_stream :
487 rate_table->info[j].valid);
488 u8 rate = rateset->rs_rates[i];
489 u8 dot11rate = rate_table->info[j].dot11rate;
491 if ((rate != dot11rate) || !WLAN_RC_PHY_HT(phy) ||
492 !WLAN_RC_PHY_HT_VALID(valid, capflag))
495 if (!ath_rc_valid_phyrate(phy, capflag, 0))
498 ath_rc_priv->valid_phy_rateidx[phy]
499 [ath_rc_priv->valid_phy_ratecnt[phy]] = j;
500 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
501 ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
509 /* Finds the highest rate index we can use */
510 static u8 ath_rc_get_highest_rix(struct ath_softc *sc,
511 struct ath_rate_priv *ath_rc_priv,
512 const struct ath_rate_table *rate_table,
515 u32 best_thruput, this_thruput, now_msec;
516 u8 rate, next_rate, best_rate, maxindex, minindex;
519 now_msec = jiffies_to_msecs(jiffies);
522 maxindex = ath_rc_priv->max_valid_rate-1;
524 best_rate = minindex;
527 * Try the higher rate first. It will reduce memory moving time
528 * if we have very good channel characteristics.
530 for (index = maxindex; index >= minindex ; index--) {
533 rate = ath_rc_priv->valid_rate_index[index];
534 if (rate > ath_rc_priv->rate_max_phy)
538 * For TCP the average collision rate is around 11%,
539 * so we ignore PERs less than this. This is to
540 * prevent the rate we are currently using (whose
541 * PER might be in the 10-15 range because of TCP
542 * collisions) looking worse than the next lower
543 * rate whose PER has decayed close to 0. If we
544 * used to next lower rate, its PER would grow to
545 * 10-15 and we would be worse off then staying
546 * at the current rate.
548 per_thres = ath_rc_priv->per[rate];
552 this_thruput = rate_table->info[rate].user_ratekbps *
555 if (best_thruput <= this_thruput) {
556 best_thruput = this_thruput;
564 * Must check the actual rate (ratekbps) to account for
565 * non-monoticity of 11g's rate table
568 if (rate >= ath_rc_priv->rate_max_phy) {
569 rate = ath_rc_priv->rate_max_phy;
571 /* Probe the next allowed phy state */
572 if (ath_rc_get_nextvalid_txrate(rate_table,
573 ath_rc_priv, rate, &next_rate) &&
574 (now_msec - ath_rc_priv->probe_time >
575 rate_table->probe_interval) &&
576 (ath_rc_priv->hw_maxretry_pktcnt >= 1)) {
578 ath_rc_priv->probe_rate = rate;
579 ath_rc_priv->probe_time = now_msec;
580 ath_rc_priv->hw_maxretry_pktcnt = 0;
585 if (rate > (ath_rc_priv->rate_table_size - 1))
586 rate = ath_rc_priv->rate_table_size - 1;
588 if (rate_table->info[rate].valid &&
589 (ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
592 if (rate_table->info[rate].valid_single_stream &&
593 !(ath_rc_priv->ht_cap & WLAN_RC_DS_FLAG))
596 /* This should not happen */
599 rate = ath_rc_priv->valid_rate_index[0];
604 static void ath_rc_rate_set_series(const struct ath_rate_table *rate_table,
605 struct ieee80211_tx_rate *rate,
606 struct ieee80211_tx_rate_control *txrc,
607 u8 tries, u8 rix, int rtsctsenable)
610 rate->idx = rate_table->info[rix].ratecode;
612 if (txrc->short_preamble)
613 rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
614 if (txrc->rts || rtsctsenable)
615 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
617 if (WLAN_RC_PHY_HT(rate_table->info[rix].phy)) {
618 rate->flags |= IEEE80211_TX_RC_MCS;
619 if (WLAN_RC_PHY_40(rate_table->info[rix].phy))
620 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
621 if (WLAN_RC_PHY_SGI(rate_table->info[rix].phy))
622 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
626 static void ath_rc_rate_set_rtscts(struct ath_softc *sc,
627 const struct ath_rate_table *rate_table,
628 struct ieee80211_tx_info *tx_info)
630 struct ieee80211_tx_rate *rates = tx_info->control.rates;
631 int i = 0, rix = 0, cix, enable_g_protection = 0;
633 /* get the cix for the lowest valid rix */
634 for (i = 3; i >= 0; i--) {
635 if (rates[i].count && (rates[i].idx >= 0)) {
636 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
640 cix = rate_table->info[rix].ctrl_rate;
642 /* All protection frames are transmited at 2Mb/s for 802.11g,
643 * otherwise we transmit them at 1Mb/s */
644 if (sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ &&
645 !conf_is_ht(&sc->hw->conf))
646 enable_g_protection = 1;
649 * If 802.11g protection is enabled, determine whether to use RTS/CTS or
650 * just CTS. Note that this is only done for OFDM/HT unicast frames.
652 if ((sc->sc_flags & SC_OP_PROTECT_ENABLE) &&
653 (rate_table->info[rix].phy == WLAN_RC_PHY_OFDM ||
654 WLAN_RC_PHY_HT(rate_table->info[rix].phy))) {
655 rates[0].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
656 cix = rate_table->info[enable_g_protection].ctrl_rate;
659 tx_info->control.rts_cts_rate_idx = cix;
662 static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
663 struct ieee80211_tx_rate_control *txrc)
665 struct ath_softc *sc = priv;
666 struct ath_rate_priv *ath_rc_priv = priv_sta;
667 const struct ath_rate_table *rate_table;
668 struct sk_buff *skb = txrc->skb;
669 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
670 struct ieee80211_tx_rate *rates = tx_info->control.rates;
671 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
672 __le16 fc = hdr->frame_control;
673 u8 try_per_rate, i = 0, rix;
676 if (rate_control_send_low(sta, priv_sta, txrc))
680 * For Multi Rate Retry we use a different number of
681 * retry attempt counts. This ends up looking like this:
691 rate_table = sc->cur_rate_table;
692 rix = ath_rc_get_highest_rix(sc, ath_rc_priv, rate_table, &is_probe);
695 * If we're in HT mode and both us and our peer supports LDPC.
696 * We don't need to check our own device's capabilities as our own
697 * ht capabilities would have already been intersected with our peer's.
699 if (conf_is_ht(&sc->hw->conf) &&
700 (sta->ht_cap.cap & IEEE80211_HT_CAP_LDPC_CODING))
701 tx_info->flags |= IEEE80211_TX_CTL_LDPC;
703 if (conf_is_ht(&sc->hw->conf) &&
704 (sta->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
705 tx_info->flags |= (1 << IEEE80211_TX_CTL_STBC_SHIFT);
708 /* set one try for probe rates. For the
709 * probes don't enable rts */
710 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
713 /* Get the next tried/allowed rate. No RTS for the next series
714 * after the probe rate
716 ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
717 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
718 try_per_rate, rix, 0);
720 tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
722 /* Set the choosen rate. No RTS for first series entry. */
723 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
724 try_per_rate, rix, 0);
727 /* Fill in the other rates for multirate retry */
728 for ( ; i < 4; i++) {
729 /* Use twice the number of tries for the last MRR segment. */
733 ath_rc_get_lower_rix(rate_table, ath_rc_priv, rix, &rix);
734 /* All other rates in the series have RTS enabled */
735 ath_rc_rate_set_series(rate_table, &rates[i], txrc,
736 try_per_rate, rix, 1);
740 * NB:Change rate series to enable aggregation when operating
741 * at lower MCS rates. When first rate in series is MCS2
742 * in HT40 @ 2.4GHz, series should look like:
744 * {MCS2, MCS1, MCS0, MCS0}.
746 * When first rate in series is MCS3 in HT20 @ 2.4GHz, series should
749 * {MCS3, MCS2, MCS1, MCS1}
751 * So, set fourth rate in series to be same as third one for
754 if ((sc->hw->conf.channel->band == IEEE80211_BAND_2GHZ) &&
755 (conf_is_ht(&sc->hw->conf))) {
756 u8 dot11rate = rate_table->info[rix].dot11rate;
757 u8 phy = rate_table->info[rix].phy;
759 ((dot11rate == 2 && phy == WLAN_RC_PHY_HT_40_SS) ||
760 (dot11rate == 3 && phy == WLAN_RC_PHY_HT_20_SS))) {
761 rates[3].idx = rates[2].idx;
762 rates[3].flags = rates[2].flags;
767 * Force hardware to use computed duration for next
768 * fragment by disabling multi-rate retry, which
769 * updates duration based on the multi-rate duration table.
771 * FIXME: Fix duration
773 if (ieee80211_has_morefrags(fc) ||
774 (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) {
775 rates[1].count = rates[2].count = rates[3].count = 0;
776 rates[1].idx = rates[2].idx = rates[3].idx = 0;
777 rates[0].count = ATH_TXMAXTRY;
781 ath_rc_rate_set_rtscts(sc, rate_table, tx_info);
784 static bool ath_rc_update_per(struct ath_softc *sc,
785 const struct ath_rate_table *rate_table,
786 struct ath_rate_priv *ath_rc_priv,
787 struct ieee80211_tx_info *tx_info,
788 int tx_rate, int xretries, int retries,
791 bool state_change = false;
792 int count, n_bad_frames;
794 static u32 nretry_to_per_lookup[10] = {
807 last_per = ath_rc_priv->per[tx_rate];
808 n_bad_frames = tx_info->status.ampdu_len - tx_info->status.ampdu_ack_len;
812 ath_rc_priv->per[tx_rate] += 30;
813 if (ath_rc_priv->per[tx_rate] > 100)
814 ath_rc_priv->per[tx_rate] = 100;
817 count = ARRAY_SIZE(nretry_to_per_lookup);
818 if (retries >= count)
821 /* new_PER = 7/8*old_PER + 1/8*(currentPER) */
822 ath_rc_priv->per[tx_rate] =
823 (u8)(last_per - (last_per >> 3) + (100 >> 3));
826 /* xretries == 1 or 2 */
828 if (ath_rc_priv->probe_rate == tx_rate)
829 ath_rc_priv->probe_rate = 0;
831 } else { /* xretries == 0 */
832 count = ARRAY_SIZE(nretry_to_per_lookup);
833 if (retries >= count)
837 /* new_PER = 7/8*old_PER + 1/8*(currentPER)
838 * Assuming that n_frames is not 0. The current PER
839 * from the retries is 100 * retries / (retries+1),
840 * since the first retries attempts failed, and the
841 * next one worked. For the one that worked,
842 * n_bad_frames subframes out of n_frames wored,
843 * so the PER for that part is
844 * 100 * n_bad_frames / n_frames, and it contributes
845 * 100 * n_bad_frames / (n_frames * (retries+1)) to
846 * the above PER. The expression below is a
847 * simplified version of the sum of these two terms.
849 if (tx_info->status.ampdu_len > 0) {
850 int n_frames, n_bad_tries;
853 n_bad_tries = retries * tx_info->status.ampdu_len +
855 n_frames = tx_info->status.ampdu_len * (retries + 1);
856 cur_per = (100 * n_bad_tries / n_frames) >> 3;
857 new_per = (u8)(last_per - (last_per >> 3) + cur_per);
858 ath_rc_priv->per[tx_rate] = new_per;
861 ath_rc_priv->per[tx_rate] =
862 (u8)(last_per - (last_per >> 3) +
863 (nretry_to_per_lookup[retries] >> 3));
868 * If we got at most one retry then increase the max rate if
869 * this was a probe. Otherwise, ignore the probe.
871 if (ath_rc_priv->probe_rate && ath_rc_priv->probe_rate == tx_rate) {
872 if (retries > 0 || 2 * n_bad_frames > tx_info->status.ampdu_len) {
874 * Since we probed with just a single attempt,
875 * any retries means the probe failed. Also,
876 * if the attempt worked, but more than half
877 * the subframes were bad then also consider
878 * the probe a failure.
880 ath_rc_priv->probe_rate = 0;
884 ath_rc_priv->rate_max_phy =
885 ath_rc_priv->probe_rate;
886 probe_rate = ath_rc_priv->probe_rate;
888 if (ath_rc_priv->per[probe_rate] > 30)
889 ath_rc_priv->per[probe_rate] = 20;
891 ath_rc_priv->probe_rate = 0;
894 * Since this probe succeeded, we allow the next
895 * probe twice as soon. This allows the maxRate
896 * to move up faster if the probes are
899 ath_rc_priv->probe_time =
900 now_msec - rate_table->probe_interval / 2;
906 * Don't update anything. We don't know if
907 * this was because of collisions or poor signal.
909 ath_rc_priv->hw_maxretry_pktcnt = 0;
912 * It worked with no retries. First ignore bogus (small)
915 if (tx_rate == ath_rc_priv->rate_max_phy &&
916 ath_rc_priv->hw_maxretry_pktcnt < 255) {
917 ath_rc_priv->hw_maxretry_pktcnt++;
926 /* Update PER, RSSI and whatever else that the code thinks it is doing.
927 If you can make sense of all this, you really need to go out more. */
929 static void ath_rc_update_ht(struct ath_softc *sc,
930 struct ath_rate_priv *ath_rc_priv,
931 struct ieee80211_tx_info *tx_info,
932 int tx_rate, int xretries, int retries)
934 u32 now_msec = jiffies_to_msecs(jiffies);
937 bool state_change = false;
938 const struct ath_rate_table *rate_table = sc->cur_rate_table;
939 int size = ath_rc_priv->rate_table_size;
941 if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
944 last_per = ath_rc_priv->per[tx_rate];
946 /* Update PER first */
947 state_change = ath_rc_update_per(sc, rate_table, ath_rc_priv,
948 tx_info, tx_rate, xretries,
952 * If this rate looks bad (high PER) then stop using it for
953 * a while (except if we are probing).
955 if (ath_rc_priv->per[tx_rate] >= 55 && tx_rate > 0 &&
956 rate_table->info[tx_rate].ratekbps <=
957 rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
958 ath_rc_get_lower_rix(rate_table, ath_rc_priv,
959 (u8)tx_rate, &ath_rc_priv->rate_max_phy);
961 /* Don't probe for a little while. */
962 ath_rc_priv->probe_time = now_msec;
965 /* Make sure the rates below this have lower PER */
966 /* Monotonicity is kept only for rates below the current rate. */
967 if (ath_rc_priv->per[tx_rate] < last_per) {
968 for (rate = tx_rate - 1; rate >= 0; rate--) {
970 if (ath_rc_priv->per[rate] >
971 ath_rc_priv->per[rate+1]) {
972 ath_rc_priv->per[rate] =
973 ath_rc_priv->per[rate+1];
978 /* Maintain monotonicity for rates above the current rate */
979 for (rate = tx_rate; rate < size - 1; rate++) {
980 if (ath_rc_priv->per[rate+1] <
981 ath_rc_priv->per[rate])
982 ath_rc_priv->per[rate+1] =
983 ath_rc_priv->per[rate];
986 /* Every so often, we reduce the thresholds
987 * and PER (different for CCK and OFDM). */
988 if (now_msec - ath_rc_priv->per_down_time >=
989 rate_table->probe_interval) {
990 for (rate = 0; rate < size; rate++) {
991 ath_rc_priv->per[rate] =
992 7 * ath_rc_priv->per[rate] / 8;
995 ath_rc_priv->per_down_time = now_msec;
998 ath_debug_stat_retries(sc, tx_rate, xretries, retries,
999 ath_rc_priv->per[tx_rate]);
1003 static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
1004 struct ieee80211_tx_rate *rate)
1008 if (!(rate->flags & IEEE80211_TX_RC_MCS))
1011 rix = rate->idx + rate_table->mcs_start;
1012 if ((rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1013 (rate->flags & IEEE80211_TX_RC_SHORT_GI))
1014 rix = rate_table->info[rix].ht_index;
1015 else if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
1016 rix = rate_table->info[rix].sgi_index;
1017 else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1018 rix = rate_table->info[rix].cw40index;
1020 rix = rate_table->info[rix].base_index;
1025 static void ath_rc_tx_status(struct ath_softc *sc,
1026 struct ath_rate_priv *ath_rc_priv,
1027 struct ieee80211_tx_info *tx_info,
1028 int final_ts_idx, int xretries, int long_retry)
1030 const struct ath_rate_table *rate_table;
1031 struct ieee80211_tx_rate *rates = tx_info->status.rates;
1035 rate_table = sc->cur_rate_table;
1038 * If the first rate is not the final index, there
1039 * are intermediate rate failures to be processed.
1041 if (final_ts_idx != 0) {
1042 /* Process intermediate rates that failed.*/
1043 for (i = 0; i < final_ts_idx ; i++) {
1044 if (rates[i].count != 0 && (rates[i].idx >= 0)) {
1045 flags = rates[i].flags;
1047 /* If HT40 and we have switched mode from
1048 * 40 to 20 => don't update */
1050 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1051 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
1054 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
1055 ath_rc_update_ht(sc, ath_rc_priv, tx_info,
1056 rix, xretries ? 1 : 2,
1062 * Handle the special case of MIMO PS burst, where the second
1063 * aggregate is sent out with only one rate and one try.
1064 * Treating it as an excessive retry penalizes the rate
1067 if (rates[0].count == 1 && xretries == 1)
1071 flags = rates[i].flags;
1073 /* If HT40 and we have switched mode from 40 to 20 => don't update */
1074 if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
1075 !(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG))
1078 rix = ath_rc_get_rateindex(rate_table, &rates[i]);
1079 ath_rc_update_ht(sc, ath_rc_priv, tx_info, rix, xretries, long_retry);
1083 struct ath_rate_table *ath_choose_rate_table(struct ath_softc *sc,
1084 enum ieee80211_band band,
1089 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1092 case IEEE80211_BAND_2GHZ:
1093 mode = ATH9K_MODE_11G;
1095 mode = ATH9K_MODE_11NG_HT20;
1097 mode = ATH9K_MODE_11NG_HT40PLUS;
1099 case IEEE80211_BAND_5GHZ:
1100 mode = ATH9K_MODE_11A;
1102 mode = ATH9K_MODE_11NA_HT20;
1104 mode = ATH9K_MODE_11NA_HT40PLUS;
1107 ath_print(common, ATH_DBG_CONFIG, "Invalid band\n");
1111 BUG_ON(mode >= ATH9K_MODE_MAX);
1113 ath_print(common, ATH_DBG_CONFIG,
1114 "Choosing rate table for mode: %d\n", mode);
1116 sc->cur_rate_mode = mode;
1117 return hw_rate_table[mode];
1120 static void ath_rc_init(struct ath_softc *sc,
1121 struct ath_rate_priv *ath_rc_priv,
1122 struct ieee80211_supported_band *sband,
1123 struct ieee80211_sta *sta,
1124 const struct ath_rate_table *rate_table)
1126 struct ath_rateset *rateset = &ath_rc_priv->neg_rates;
1127 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1128 u8 *ht_mcs = (u8 *)&ath_rc_priv->neg_ht_rates;
1129 u8 i, j, k, hi = 0, hthi = 0;
1131 /* Initial rate table size. Will change depending
1132 * on the working rate set */
1133 ath_rc_priv->rate_table_size = RATE_TABLE_SIZE;
1135 /* Initialize thresholds according to the global rate table */
1136 for (i = 0 ; i < ath_rc_priv->rate_table_size; i++) {
1137 ath_rc_priv->per[i] = 0;
1140 /* Determine the valid rates */
1141 ath_rc_init_valid_txmask(ath_rc_priv);
1143 for (i = 0; i < WLAN_RC_PHY_MAX; i++) {
1144 for (j = 0; j < MAX_TX_RATE_PHY; j++)
1145 ath_rc_priv->valid_phy_rateidx[i][j] = 0;
1146 ath_rc_priv->valid_phy_ratecnt[i] = 0;
1149 if (!rateset->rs_nrates) {
1150 /* No working rate, just initialize valid rates */
1151 hi = ath_rc_init_validrates(ath_rc_priv, rate_table,
1152 ath_rc_priv->ht_cap);
1154 /* Use intersection of working rates and valid rates */
1155 hi = ath_rc_setvalid_rates(ath_rc_priv, rate_table,
1156 rateset, ath_rc_priv->ht_cap);
1157 if (ath_rc_priv->ht_cap & WLAN_RC_HT_FLAG) {
1158 hthi = ath_rc_setvalid_htrates(ath_rc_priv,
1161 ath_rc_priv->ht_cap);
1163 hi = A_MAX(hi, hthi);
1166 ath_rc_priv->rate_table_size = hi + 1;
1167 ath_rc_priv->rate_max_phy = 0;
1168 BUG_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);
1170 for (i = 0, k = 0; i < WLAN_RC_PHY_MAX; i++) {
1171 for (j = 0; j < ath_rc_priv->valid_phy_ratecnt[i]; j++) {
1172 ath_rc_priv->valid_rate_index[k++] =
1173 ath_rc_priv->valid_phy_rateidx[i][j];
1176 if (!ath_rc_valid_phyrate(i, rate_table->initial_ratemax, 1)
1177 || !ath_rc_priv->valid_phy_ratecnt[i])
1180 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_phy_rateidx[i][j-1];
1182 BUG_ON(ath_rc_priv->rate_table_size > RATE_TABLE_SIZE);
1183 BUG_ON(k > RATE_TABLE_SIZE);
1185 ath_rc_priv->max_valid_rate = k;
1186 ath_rc_sort_validrates(rate_table, ath_rc_priv);
1187 ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
1188 sc->cur_rate_table = rate_table;
1190 ath_print(common, ATH_DBG_CONFIG,
1191 "RC Initialized with capabilities: 0x%x\n",
1192 ath_rc_priv->ht_cap);
1195 static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta,
1196 bool is_cw40, bool is_sgi40)
1200 if (sta->ht_cap.ht_supported) {
1201 caps = WLAN_RC_HT_FLAG;
1202 if (sc->sc_ah->caps.tx_chainmask != 1 &&
1203 ath9k_hw_getcapability(sc->sc_ah, ATH9K_CAP_DS, 0, NULL)) {
1204 if (sta->ht_cap.mcs.rx_mask[1])
1205 caps |= WLAN_RC_DS_FLAG;
1208 caps |= WLAN_RC_40_FLAG;
1210 caps |= WLAN_RC_SGI_FLAG;
1216 /***********************************/
1217 /* mac80211 Rate Control callbacks */
1218 /***********************************/
1220 static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
1221 struct ieee80211_sta *sta, void *priv_sta,
1222 struct sk_buff *skb)
1224 struct ath_softc *sc = priv;
1225 struct ath_rate_priv *ath_rc_priv = priv_sta;
1226 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1227 struct ieee80211_hdr *hdr;
1228 int final_ts_idx = 0, tx_status = 0, is_underrun = 0;
1233 hdr = (struct ieee80211_hdr *)skb->data;
1234 fc = hdr->frame_control;
1235 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
1236 struct ieee80211_tx_rate *rate = &tx_info->status.rates[i];
1241 long_retry = rate->count - 1;
1244 if (!priv_sta || !ieee80211_is_data(fc))
1247 /* This packet was aggregated but doesn't carry status info */
1248 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) &&
1249 !(tx_info->flags & IEEE80211_TX_STAT_AMPDU))
1252 if (tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED)
1256 * If an underrun error is seen assume it as an excessive retry only
1257 * if max frame trigger level has been reached (2 KB for singel stream,
1258 * and 4 KB for dual stream). Adjust the long retry as if the frame was
1259 * tried hw->max_rate_tries times to affect how ratectrl updates PER for
1260 * the failed rate. In case of congestion on the bus penalizing these
1261 * type of underruns should help hardware actually transmit new frames
1262 * successfully by eventually preferring slower rates. This itself
1263 * should also alleviate congestion on the bus.
1265 if ((tx_info->pad[0] & ATH_TX_INFO_UNDERRUN) &&
1266 (sc->sc_ah->tx_trig_level >= ath_rc_priv->tx_triglevel_max)) {
1271 if (tx_info->pad[0] & ATH_TX_INFO_XRETRY)
1274 ath_rc_tx_status(sc, ath_rc_priv, tx_info, final_ts_idx, tx_status,
1275 (is_underrun) ? sc->hw->max_rate_tries : long_retry);
1277 /* Check if aggregation has to be enabled for this tid */
1278 if (conf_is_ht(&sc->hw->conf) &&
1279 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
1280 if (ieee80211_is_data_qos(fc)) {
1282 struct ath_node *an;
1284 qc = ieee80211_get_qos_ctl(hdr);
1286 an = (struct ath_node *)sta->drv_priv;
1288 if(ath_tx_aggr_check(sc, an, tid))
1289 ieee80211_start_tx_ba_session(sta, tid);
1293 ath_debug_stat_rc(sc, ath_rc_get_rateindex(sc->cur_rate_table,
1294 &tx_info->status.rates[final_ts_idx]));
1297 static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
1298 struct ieee80211_sta *sta, void *priv_sta)
1300 struct ath_softc *sc = priv;
1301 struct ath_rate_priv *ath_rc_priv = priv_sta;
1302 const struct ath_rate_table *rate_table;
1303 bool is_cw40, is_sgi40;
1306 for (i = 0; i < sband->n_bitrates; i++) {
1307 if (sta->supp_rates[sband->band] & BIT(i)) {
1308 ath_rc_priv->neg_rates.rs_rates[j]
1309 = (sband->bitrates[i].bitrate * 2) / 10;
1313 ath_rc_priv->neg_rates.rs_nrates = j;
1315 if (sta->ht_cap.ht_supported) {
1316 for (i = 0, j = 0; i < 77; i++) {
1317 if (sta->ht_cap.mcs.rx_mask[i/8] & (1<<(i%8)))
1318 ath_rc_priv->neg_ht_rates.rs_rates[j++] = i;
1319 if (j == ATH_RATE_MAX)
1322 ath_rc_priv->neg_ht_rates.rs_nrates = j;
1325 is_cw40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
1326 is_sgi40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
1328 /* Choose rate table first */
1330 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) ||
1331 (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) ||
1332 (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC)) {
1333 rate_table = ath_choose_rate_table(sc, sband->band,
1334 sta->ht_cap.ht_supported, is_cw40);
1336 rate_table = hw_rate_table[sc->cur_rate_mode];
1339 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta, is_cw40, is_sgi40);
1340 ath_rc_init(sc, priv_sta, sband, sta, rate_table);
1343 static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
1344 struct ieee80211_sta *sta, void *priv_sta,
1345 u32 changed, enum nl80211_channel_type oper_chan_type)
1347 struct ath_softc *sc = priv;
1348 struct ath_rate_priv *ath_rc_priv = priv_sta;
1349 const struct ath_rate_table *rate_table = NULL;
1350 bool oper_cw40 = false, oper_sgi40;
1351 bool local_cw40 = (ath_rc_priv->ht_cap & WLAN_RC_40_FLAG) ?
1353 bool local_sgi40 = (ath_rc_priv->ht_cap & WLAN_RC_SGI_FLAG) ?
1356 /* FIXME: Handle AP mode later when we support CWM */
1358 if (changed & IEEE80211_RC_HT_CHANGED) {
1359 if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
1362 if (oper_chan_type == NL80211_CHAN_HT40MINUS ||
1363 oper_chan_type == NL80211_CHAN_HT40PLUS)
1366 oper_sgi40 = (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40) ?
1369 if ((local_cw40 != oper_cw40) || (local_sgi40 != oper_sgi40)) {
1370 rate_table = ath_choose_rate_table(sc, sband->band,
1371 sta->ht_cap.ht_supported,
1373 ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta,
1374 oper_cw40, oper_sgi40);
1375 ath_rc_init(sc, priv_sta, sband, sta, rate_table);
1377 ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_CONFIG,
1378 "Operating HT Bandwidth changed to: %d\n",
1379 sc->hw->conf.channel_type);
1380 sc->cur_rate_table = hw_rate_table[sc->cur_rate_mode];
1385 static void *ath_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
1387 struct ath_wiphy *aphy = hw->priv;
1391 static void ath_rate_free(void *priv)
1396 static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
1398 struct ath_softc *sc = priv;
1399 struct ath_rate_priv *rate_priv;
1401 rate_priv = kzalloc(sizeof(struct ath_rate_priv), gfp);
1403 ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
1404 "Unable to allocate private rc structure\n");
1408 rate_priv->tx_triglevel_max = sc->sc_ah->caps.tx_triglevel_max;
1413 static void ath_rate_free_sta(void *priv, struct ieee80211_sta *sta,
1416 struct ath_rate_priv *rate_priv = priv_sta;
1420 static struct rate_control_ops ath_rate_ops = {
1422 .name = "ath9k_rate_control",
1423 .tx_status = ath_tx_status,
1424 .get_rate = ath_get_rate,
1425 .rate_init = ath_rate_init,
1426 .rate_update = ath_rate_update,
1427 .alloc = ath_rate_alloc,
1428 .free = ath_rate_free,
1429 .alloc_sta = ath_rate_alloc_sta,
1430 .free_sta = ath_rate_free_sta,
1433 int ath_rate_control_register(void)
1435 return ieee80211_rate_control_register(&ath_rate_ops);
1438 void ath_rate_control_unregister(void)
1440 ieee80211_rate_control_unregister(&ath_rate_ops);