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Felix Fietkauec8aa662010-05-13 16:48:03 +02001/*
Felix Fietkaua0497f92013-02-13 10:51:08 +01002 * Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org>
Felix Fietkauec8aa662010-05-13 16:48:03 +02003 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8#include <linux/netdevice.h>
9#include <linux/types.h>
10#include <linux/skbuff.h>
11#include <linux/debugfs.h>
12#include <linux/random.h>
Karl Beldan92082472014-10-21 10:38:38 +020013#include <linux/moduleparam.h>
Felix Fietkauec8aa662010-05-13 16:48:03 +020014#include <linux/ieee80211.h>
15#include <net/mac80211.h>
16#include "rate.h"
17#include "rc80211_minstrel.h"
18#include "rc80211_minstrel_ht.h"
19
Felix Fietkaud66c2582015-03-13 10:54:44 +010020#define AVG_AMPDU_SIZE 16
Felix Fietkauec8aa662010-05-13 16:48:03 +020021#define AVG_PKT_SIZE 1200
Felix Fietkauec8aa662010-05-13 16:48:03 +020022
23/* Number of bits for an average sized packet */
Felix Fietkaud66c2582015-03-13 10:54:44 +010024#define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_SIZE) << 3)
Felix Fietkauec8aa662010-05-13 16:48:03 +020025
26/* Number of symbols for a packet with (bps) bits per symbol */
Johannes Berg00591ce2014-05-19 11:24:19 +020027#define MCS_NSYMS(bps) DIV_ROUND_UP(MCS_NBITS, (bps))
Felix Fietkauec8aa662010-05-13 16:48:03 +020028
Felix Fietkaued97a132013-03-02 21:20:12 +010029/* Transmission time (nanoseconds) for a packet containing (syms) symbols */
Felix Fietkauec8aa662010-05-13 16:48:03 +020030#define MCS_SYMBOL_TIME(sgi, syms) \
31 (sgi ? \
Felix Fietkaued97a132013-03-02 21:20:12 +010032 ((syms) * 18000 + 4000) / 5 : /* syms * 3.6 us */ \
33 ((syms) * 1000) << 2 /* syms * 4 us */ \
Felix Fietkauec8aa662010-05-13 16:48:03 +020034 )
35
36/* Transmit duration for the raw data part of an average sized packet */
Felix Fietkaud66c2582015-03-13 10:54:44 +010037#define MCS_DURATION(streams, sgi, bps) \
38 (MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps))) / AVG_AMPDU_SIZE)
Felix Fietkauec8aa662010-05-13 16:48:03 +020039
Karl Beldan8a0ee4f2014-10-20 15:46:00 +020040#define BW_20 0
41#define BW_40 1
Karl Beldan92082472014-10-21 10:38:38 +020042#define BW_80 2
Karl Beldan8a0ee4f2014-10-20 15:46:00 +020043
Helmut Schaaa5f69d942011-11-14 15:28:20 +010044/*
45 * Define group sort order: HT40 -> SGI -> #streams
46 */
47#define GROUP_IDX(_streams, _sgi, _ht40) \
Karl Beldan8a0ee4f2014-10-20 15:46:00 +020048 MINSTREL_HT_GROUP_0 + \
Helmut Schaaa5f69d942011-11-14 15:28:20 +010049 MINSTREL_MAX_STREAMS * 2 * _ht40 + \
Karl Beldan8a0ee4f2014-10-20 15:46:00 +020050 MINSTREL_MAX_STREAMS * _sgi + \
Helmut Schaaa5f69d942011-11-14 15:28:20 +010051 _streams - 1
52
Felix Fietkauec8aa662010-05-13 16:48:03 +020053/* MCS rate information for an MCS group */
Helmut Schaaa5f69d942011-11-14 15:28:20 +010054#define MCS_GROUP(_streams, _sgi, _ht40) \
55 [GROUP_IDX(_streams, _sgi, _ht40)] = { \
Felix Fietkauec8aa662010-05-13 16:48:03 +020056 .streams = _streams, \
57 .flags = \
Karl Beldan3ec373c2014-10-20 15:46:01 +020058 IEEE80211_TX_RC_MCS | \
Felix Fietkauec8aa662010-05-13 16:48:03 +020059 (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
60 (_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \
61 .duration = { \
62 MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26), \
63 MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52), \
64 MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78), \
65 MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104), \
66 MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156), \
67 MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208), \
68 MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234), \
69 MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) \
70 } \
71}
72
Karl Beldan92082472014-10-21 10:38:38 +020073#define VHT_GROUP_IDX(_streams, _sgi, _bw) \
74 (MINSTREL_VHT_GROUP_0 + \
75 MINSTREL_MAX_STREAMS * 2 * (_bw) + \
76 MINSTREL_MAX_STREAMS * (_sgi) + \
77 (_streams) - 1)
78
79#define BW2VBPS(_bw, r3, r2, r1) \
80 (_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1)
81
82#define VHT_GROUP(_streams, _sgi, _bw) \
83 [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \
84 .streams = _streams, \
85 .flags = \
86 IEEE80211_TX_RC_VHT_MCS | \
87 (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
88 (_bw == BW_80 ? IEEE80211_TX_RC_80_MHZ_WIDTH : \
89 _bw == BW_40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \
90 .duration = { \
91 MCS_DURATION(_streams, _sgi, \
92 BW2VBPS(_bw, 117, 54, 26)), \
93 MCS_DURATION(_streams, _sgi, \
94 BW2VBPS(_bw, 234, 108, 52)), \
95 MCS_DURATION(_streams, _sgi, \
96 BW2VBPS(_bw, 351, 162, 78)), \
97 MCS_DURATION(_streams, _sgi, \
98 BW2VBPS(_bw, 468, 216, 104)), \
99 MCS_DURATION(_streams, _sgi, \
100 BW2VBPS(_bw, 702, 324, 156)), \
101 MCS_DURATION(_streams, _sgi, \
102 BW2VBPS(_bw, 936, 432, 208)), \
103 MCS_DURATION(_streams, _sgi, \
104 BW2VBPS(_bw, 1053, 486, 234)), \
105 MCS_DURATION(_streams, _sgi, \
106 BW2VBPS(_bw, 1170, 540, 260)), \
107 MCS_DURATION(_streams, _sgi, \
108 BW2VBPS(_bw, 1404, 648, 312)), \
109 MCS_DURATION(_streams, _sgi, \
110 BW2VBPS(_bw, 1560, 720, 346)) \
111 } \
112}
113
Felix Fietkaua0497f92013-02-13 10:51:08 +0100114#define CCK_DURATION(_bitrate, _short, _len) \
Felix Fietkaued97a132013-03-02 21:20:12 +0100115 (1000 * (10 /* SIFS */ + \
Weilong Chenf359d3f2013-12-18 15:44:16 +0800116 (_short ? 72 + 24 : 144 + 48) + \
Felix Fietkaued97a132013-03-02 21:20:12 +0100117 (8 * (_len + 4) * 10) / (_bitrate)))
Felix Fietkaua0497f92013-02-13 10:51:08 +0100118
119#define CCK_ACK_DURATION(_bitrate, _short) \
120 (CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \
121 CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE))
122
123#define CCK_DURATION_LIST(_short) \
124 CCK_ACK_DURATION(10, _short), \
125 CCK_ACK_DURATION(20, _short), \
126 CCK_ACK_DURATION(55, _short), \
127 CCK_ACK_DURATION(110, _short)
128
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200129#define CCK_GROUP \
130 [MINSTREL_CCK_GROUP] = { \
131 .streams = 0, \
Karl Beldan3ec373c2014-10-20 15:46:01 +0200132 .flags = 0, \
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200133 .duration = { \
134 CCK_DURATION_LIST(false), \
135 CCK_DURATION_LIST(true) \
136 } \
Felix Fietkaua0497f92013-02-13 10:51:08 +0100137 }
138
Karl Beldan92082472014-10-21 10:38:38 +0200139#ifdef CONFIG_MAC80211_RC_MINSTREL_VHT
140static bool minstrel_vht_only = true;
141module_param(minstrel_vht_only, bool, 0644);
142MODULE_PARM_DESC(minstrel_vht_only,
143 "Use only VHT rates when VHT is supported by sta.");
144#endif
145
Felix Fietkauec8aa662010-05-13 16:48:03 +0200146/*
147 * To enable sufficiently targeted rate sampling, MCS rates are divided into
148 * groups, based on the number of streams and flags (HT40, SGI) that they
149 * use.
Helmut Schaaa5f69d942011-11-14 15:28:20 +0100150 *
151 * Sortorder has to be fixed for GROUP_IDX macro to be applicable:
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200152 * BW -> SGI -> #streams
Felix Fietkauec8aa662010-05-13 16:48:03 +0200153 */
154const struct mcs_group minstrel_mcs_groups[] = {
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200155 MCS_GROUP(1, 0, BW_20),
156 MCS_GROUP(2, 0, BW_20),
Felix Fietkauec8aa662010-05-13 16:48:03 +0200157#if MINSTREL_MAX_STREAMS >= 3
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200158 MCS_GROUP(3, 0, BW_20),
Felix Fietkauec8aa662010-05-13 16:48:03 +0200159#endif
160
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200161 MCS_GROUP(1, 1, BW_20),
162 MCS_GROUP(2, 1, BW_20),
Felix Fietkauec8aa662010-05-13 16:48:03 +0200163#if MINSTREL_MAX_STREAMS >= 3
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200164 MCS_GROUP(3, 1, BW_20),
Felix Fietkauec8aa662010-05-13 16:48:03 +0200165#endif
166
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200167 MCS_GROUP(1, 0, BW_40),
168 MCS_GROUP(2, 0, BW_40),
Felix Fietkauec8aa662010-05-13 16:48:03 +0200169#if MINSTREL_MAX_STREAMS >= 3
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200170 MCS_GROUP(3, 0, BW_40),
Felix Fietkauec8aa662010-05-13 16:48:03 +0200171#endif
172
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200173 MCS_GROUP(1, 1, BW_40),
174 MCS_GROUP(2, 1, BW_40),
Felix Fietkauec8aa662010-05-13 16:48:03 +0200175#if MINSTREL_MAX_STREAMS >= 3
Karl Beldan8a0ee4f2014-10-20 15:46:00 +0200176 MCS_GROUP(3, 1, BW_40),
Felix Fietkauec8aa662010-05-13 16:48:03 +0200177#endif
Felix Fietkaua0497f92013-02-13 10:51:08 +0100178
Karl Beldan92082472014-10-21 10:38:38 +0200179 CCK_GROUP,
Felix Fietkauec8aa662010-05-13 16:48:03 +0200180
Karl Beldan92082472014-10-21 10:38:38 +0200181#ifdef CONFIG_MAC80211_RC_MINSTREL_VHT
182 VHT_GROUP(1, 0, BW_20),
183 VHT_GROUP(2, 0, BW_20),
184#if MINSTREL_MAX_STREAMS >= 3
185 VHT_GROUP(3, 0, BW_20),
186#endif
187
188 VHT_GROUP(1, 1, BW_20),
189 VHT_GROUP(2, 1, BW_20),
190#if MINSTREL_MAX_STREAMS >= 3
191 VHT_GROUP(3, 1, BW_20),
192#endif
193
194 VHT_GROUP(1, 0, BW_40),
195 VHT_GROUP(2, 0, BW_40),
196#if MINSTREL_MAX_STREAMS >= 3
197 VHT_GROUP(3, 0, BW_40),
198#endif
199
200 VHT_GROUP(1, 1, BW_40),
201 VHT_GROUP(2, 1, BW_40),
202#if MINSTREL_MAX_STREAMS >= 3
203 VHT_GROUP(3, 1, BW_40),
204#endif
205
206 VHT_GROUP(1, 0, BW_80),
207 VHT_GROUP(2, 0, BW_80),
208#if MINSTREL_MAX_STREAMS >= 3
209 VHT_GROUP(3, 0, BW_80),
210#endif
211
212 VHT_GROUP(1, 1, BW_80),
213 VHT_GROUP(2, 1, BW_80),
214#if MINSTREL_MAX_STREAMS >= 3
215 VHT_GROUP(3, 1, BW_80),
216#endif
217#endif
218};
Felix Fietkaua0497f92013-02-13 10:51:08 +0100219
Johannes Bergf6e1a732014-01-21 00:32:52 +0100220static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200221
Felix Fietkaua8566662013-04-22 16:14:42 +0200222static void
223minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi);
224
Felix Fietkauec8aa662010-05-13 16:48:03 +0200225/*
Karl Beldan92082472014-10-21 10:38:38 +0200226 * Some VHT MCSes are invalid (when Ndbps / Nes is not an integer)
227 * e.g for MCS9@20MHzx1Nss: Ndbps=8x52*(5/6) Nes=1
228 *
229 * Returns the valid mcs map for struct minstrel_mcs_group_data.supported
230 */
231static u16
232minstrel_get_valid_vht_rates(int bw, int nss, __le16 mcs_map)
233{
234 u16 mask = 0;
235
236 if (bw == BW_20) {
237 if (nss != 3 && nss != 6)
238 mask = BIT(9);
239 } else if (bw == BW_80) {
240 if (nss == 3 || nss == 7)
241 mask = BIT(6);
242 else if (nss == 6)
243 mask = BIT(9);
244 } else {
245 WARN_ON(bw != BW_40);
246 }
247
248 switch ((le16_to_cpu(mcs_map) >> (2 * (nss - 1))) & 3) {
249 case IEEE80211_VHT_MCS_SUPPORT_0_7:
250 mask |= 0x300;
251 break;
252 case IEEE80211_VHT_MCS_SUPPORT_0_8:
253 mask |= 0x200;
254 break;
255 case IEEE80211_VHT_MCS_SUPPORT_0_9:
256 break;
257 default:
258 mask = 0x3ff;
259 }
260
261 return 0x3ff & ~mask;
262}
263
264/*
Felix Fietkauec8aa662010-05-13 16:48:03 +0200265 * Look up an MCS group index based on mac80211 rate information
266 */
267static int
268minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate)
269{
Karl Beldancc61d8d2014-09-29 02:36:30 +0200270 return GROUP_IDX((rate->idx / 8) + 1,
Helmut Schaaa5f69d942011-11-14 15:28:20 +0100271 !!(rate->flags & IEEE80211_TX_RC_SHORT_GI),
272 !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH));
Felix Fietkauec8aa662010-05-13 16:48:03 +0200273}
274
Karl Beldan92082472014-10-21 10:38:38 +0200275static int
276minstrel_vht_get_group_idx(struct ieee80211_tx_rate *rate)
277{
278 return VHT_GROUP_IDX(ieee80211_rate_get_vht_nss(rate),
279 !!(rate->flags & IEEE80211_TX_RC_SHORT_GI),
280 !!(rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) +
281 2*!!(rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH));
282}
283
Felix Fietkaua0497f92013-02-13 10:51:08 +0100284static struct minstrel_rate_stats *
285minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
286 struct ieee80211_tx_rate *rate)
287{
288 int group, idx;
289
290 if (rate->flags & IEEE80211_TX_RC_MCS) {
291 group = minstrel_ht_get_group_idx(rate);
Karl Beldan7a5e3fa2013-11-11 13:12:55 +0100292 idx = rate->idx % 8;
Karl Beldan92082472014-10-21 10:38:38 +0200293 } else if (rate->flags & IEEE80211_TX_RC_VHT_MCS) {
294 group = minstrel_vht_get_group_idx(rate);
295 idx = ieee80211_rate_get_vht_mcs(rate);
Felix Fietkaua0497f92013-02-13 10:51:08 +0100296 } else {
297 group = MINSTREL_CCK_GROUP;
298
299 for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++)
300 if (rate->idx == mp->cck_rates[idx])
301 break;
302
303 /* short preamble */
304 if (!(mi->groups[group].supported & BIT(idx)))
305 idx += 4;
306 }
307 return &mi->groups[group].rates[idx];
308}
309
Felix Fietkauec8aa662010-05-13 16:48:03 +0200310static inline struct minstrel_rate_stats *
311minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index)
312{
313 return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES];
314}
315
Felix Fietkauec8aa662010-05-13 16:48:03 +0200316/*
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100317 * Return current throughput based on the average A-MPDU length, taking into
318 * account the expected number of retransmissions and their expected length
Felix Fietkauec8aa662010-05-13 16:48:03 +0200319 */
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100320int
Thomas Huehn50e55a82015-03-24 21:09:41 +0100321minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
322 int prob_ewma)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200323{
Felix Fietkaued97a132013-03-02 21:20:12 +0100324 unsigned int nsecs = 0;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200325
Thomas Huehn91340732015-03-24 21:09:39 +0100326 /* do not account throughput if sucess prob is below 10% */
Thomas Huehn50e55a82015-03-24 21:09:41 +0100327 if (prob_ewma < MINSTREL_FRAC(10, 100))
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100328 return 0;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200329
Felix Fietkaua0497f92013-02-13 10:51:08 +0100330 if (group != MINSTREL_CCK_GROUP)
Felix Fietkaued97a132013-03-02 21:20:12 +0100331 nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len);
Felix Fietkaua0497f92013-02-13 10:51:08 +0100332
Felix Fietkaued97a132013-03-02 21:20:12 +0100333 nsecs += minstrel_mcs_groups[group].duration[rate];
Felix Fietkaued97a132013-03-02 21:20:12 +0100334
Thomas Huehn50e55a82015-03-24 21:09:41 +0100335 /*
336 * For the throughput calculation, limit the probability value to 90% to
337 * account for collision related packet error rate fluctuation
338 * (prob is scaled - see MINSTREL_FRAC above)
339 */
340 if (prob_ewma > MINSTREL_FRAC(90, 100))
341 return MINSTREL_TRUNC(100000 * ((MINSTREL_FRAC(90, 100) * 1000)
342 / nsecs));
343 else
344 return MINSTREL_TRUNC(100000 * ((prob_ewma * 1000) / nsecs));
Felix Fietkauec8aa662010-05-13 16:48:03 +0200345}
346
347/*
Thomas Huehn59358392014-09-09 23:22:14 +0200348 * Find & sort topmost throughput rates
349 *
350 * If multiple rates provide equal throughput the sorting is based on their
351 * current success probability. Higher success probability is preferred among
352 * MCS groups, CCK rates do not provide aggregation and are therefore at last.
353 */
354static void
Karl Beldand4d141c2014-10-20 15:45:59 +0200355minstrel_ht_sort_best_tp_rates(struct minstrel_ht_sta *mi, u16 index,
356 u16 *tp_list)
Thomas Huehn59358392014-09-09 23:22:14 +0200357{
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100358 int cur_group, cur_idx, cur_tp_avg, cur_prob;
359 int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob;
Thomas Huehn59358392014-09-09 23:22:14 +0200360 int j = MAX_THR_RATES;
361
362 cur_group = index / MCS_GROUP_RATES;
363 cur_idx = index % MCS_GROUP_RATES;
Thomas Huehn91340732015-03-24 21:09:39 +0100364 cur_prob = mi->groups[cur_group].rates[cur_idx].prob_ewma;
Thomas Huehn50e55a82015-03-24 21:09:41 +0100365 cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx, cur_prob);
Thomas Huehn59358392014-09-09 23:22:14 +0200366
Felix Fietkau280ba512014-11-18 22:35:31 +0100367 do {
Thomas Huehn59358392014-09-09 23:22:14 +0200368 tmp_group = tp_list[j - 1] / MCS_GROUP_RATES;
369 tmp_idx = tp_list[j - 1] % MCS_GROUP_RATES;
Thomas Huehn91340732015-03-24 21:09:39 +0100370 tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma;
Thomas Huehn50e55a82015-03-24 21:09:41 +0100371 tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx,
372 tmp_prob);
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100373 if (cur_tp_avg < tmp_tp_avg ||
374 (cur_tp_avg == tmp_tp_avg && cur_prob <= tmp_prob))
Felix Fietkau280ba512014-11-18 22:35:31 +0100375 break;
376 j--;
377 } while (j > 0);
Thomas Huehn59358392014-09-09 23:22:14 +0200378
379 if (j < MAX_THR_RATES - 1) {
380 memmove(&tp_list[j + 1], &tp_list[j], (sizeof(*tp_list) *
381 (MAX_THR_RATES - (j + 1))));
382 }
383 if (j < MAX_THR_RATES)
384 tp_list[j] = index;
385}
386
387/*
388 * Find and set the topmost probability rate per sta and per group
389 */
390static void
Karl Beldand4d141c2014-10-20 15:45:59 +0200391minstrel_ht_set_best_prob_rate(struct minstrel_ht_sta *mi, u16 index)
Thomas Huehn59358392014-09-09 23:22:14 +0200392{
393 struct minstrel_mcs_group_data *mg;
Thomas Huehn91340732015-03-24 21:09:39 +0100394 struct minstrel_rate_stats *mrs;
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100395 int tmp_group, tmp_idx, tmp_tp_avg, tmp_prob;
396 int max_tp_group, cur_tp_avg, cur_group, cur_idx;
Thomas Huehn50e55a82015-03-24 21:09:41 +0100397 int max_gpr_group, max_gpr_idx;
398 int max_gpr_tp_avg, max_gpr_prob;
Thomas Huehn59358392014-09-09 23:22:14 +0200399
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100400 cur_group = index / MCS_GROUP_RATES;
401 cur_idx = index % MCS_GROUP_RATES;
Thomas Huehn59358392014-09-09 23:22:14 +0200402 mg = &mi->groups[index / MCS_GROUP_RATES];
Thomas Huehn91340732015-03-24 21:09:39 +0100403 mrs = &mg->rates[index % MCS_GROUP_RATES];
Thomas Huehn59358392014-09-09 23:22:14 +0200404
405 tmp_group = mi->max_prob_rate / MCS_GROUP_RATES;
406 tmp_idx = mi->max_prob_rate % MCS_GROUP_RATES;
Thomas Huehn91340732015-03-24 21:09:39 +0100407 tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma;
Thomas Huehn50e55a82015-03-24 21:09:41 +0100408 tmp_tp_avg = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob);
Thomas Huehn59358392014-09-09 23:22:14 +0200409
410 /* if max_tp_rate[0] is from MCS_GROUP max_prob_rate get selected from
411 * MCS_GROUP as well as CCK_GROUP rates do not allow aggregation */
412 max_tp_group = mi->max_tp_rate[0] / MCS_GROUP_RATES;
413 if((index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) &&
414 (max_tp_group != MINSTREL_CCK_GROUP))
415 return;
416
Konstantin Khlebnikovf84a9372016-01-29 11:35:12 +0300417 max_gpr_group = mg->max_group_prob_rate / MCS_GROUP_RATES;
418 max_gpr_idx = mg->max_group_prob_rate % MCS_GROUP_RATES;
419 max_gpr_prob = mi->groups[max_gpr_group].rates[max_gpr_idx].prob_ewma;
420
Thomas Huehn91340732015-03-24 21:09:39 +0100421 if (mrs->prob_ewma > MINSTREL_FRAC(75, 100)) {
Thomas Huehn50e55a82015-03-24 21:09:41 +0100422 cur_tp_avg = minstrel_ht_get_tp_avg(mi, cur_group, cur_idx,
423 mrs->prob_ewma);
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100424 if (cur_tp_avg > tmp_tp_avg)
Thomas Huehn59358392014-09-09 23:22:14 +0200425 mi->max_prob_rate = index;
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100426
Thomas Huehn50e55a82015-03-24 21:09:41 +0100427 max_gpr_tp_avg = minstrel_ht_get_tp_avg(mi, max_gpr_group,
428 max_gpr_idx,
429 max_gpr_prob);
430 if (cur_tp_avg > max_gpr_tp_avg)
Thomas Huehn59358392014-09-09 23:22:14 +0200431 mg->max_group_prob_rate = index;
432 } else {
Thomas Huehn91340732015-03-24 21:09:39 +0100433 if (mrs->prob_ewma > tmp_prob)
Thomas Huehn59358392014-09-09 23:22:14 +0200434 mi->max_prob_rate = index;
Konstantin Khlebnikovf84a9372016-01-29 11:35:12 +0300435 if (mrs->prob_ewma > max_gpr_prob)
Thomas Huehn59358392014-09-09 23:22:14 +0200436 mg->max_group_prob_rate = index;
437 }
438}
439
440
441/*
442 * Assign new rate set per sta and use CCK rates only if the fastest
443 * rate (max_tp_rate[0]) is from CCK group. This prohibits such sorted
444 * rate sets where MCS and CCK rates are mixed, because CCK rates can
445 * not use aggregation.
446 */
447static void
448minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi,
Karl Beldand4d141c2014-10-20 15:45:59 +0200449 u16 tmp_mcs_tp_rate[MAX_THR_RATES],
450 u16 tmp_cck_tp_rate[MAX_THR_RATES])
Thomas Huehn59358392014-09-09 23:22:14 +0200451{
Thomas Huehn50e55a82015-03-24 21:09:41 +0100452 unsigned int tmp_group, tmp_idx, tmp_cck_tp, tmp_mcs_tp, tmp_prob;
Thomas Huehn59358392014-09-09 23:22:14 +0200453 int i;
454
455 tmp_group = tmp_cck_tp_rate[0] / MCS_GROUP_RATES;
456 tmp_idx = tmp_cck_tp_rate[0] % MCS_GROUP_RATES;
Thomas Huehn50e55a82015-03-24 21:09:41 +0100457 tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma;
458 tmp_cck_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob);
Thomas Huehn59358392014-09-09 23:22:14 +0200459
460 tmp_group = tmp_mcs_tp_rate[0] / MCS_GROUP_RATES;
461 tmp_idx = tmp_mcs_tp_rate[0] % MCS_GROUP_RATES;
Thomas Huehn50e55a82015-03-24 21:09:41 +0100462 tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma;
463 tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob);
Thomas Huehn59358392014-09-09 23:22:14 +0200464
465 if (tmp_cck_tp > tmp_mcs_tp) {
466 for(i = 0; i < MAX_THR_RATES; i++) {
467 minstrel_ht_sort_best_tp_rates(mi, tmp_cck_tp_rate[i],
468 tmp_mcs_tp_rate);
469 }
470 }
471
472}
473
474/*
475 * Try to increase robustness of max_prob rate by decrease number of
476 * streams if possible.
477 */
478static inline void
479minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi)
480{
481 struct minstrel_mcs_group_data *mg;
Thomas Huehn50e55a82015-03-24 21:09:41 +0100482 int tmp_max_streams, group, tmp_idx, tmp_prob;
Thomas Huehn59358392014-09-09 23:22:14 +0200483 int tmp_tp = 0;
484
485 tmp_max_streams = minstrel_mcs_groups[mi->max_tp_rate[0] /
486 MCS_GROUP_RATES].streams;
487 for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
488 mg = &mi->groups[group];
489 if (!mg->supported || group == MINSTREL_CCK_GROUP)
490 continue;
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100491
492 tmp_idx = mg->max_group_prob_rate % MCS_GROUP_RATES;
Thomas Huehn50e55a82015-03-24 21:09:41 +0100493 tmp_prob = mi->groups[group].rates[tmp_idx].prob_ewma;
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100494
Thomas Huehn50e55a82015-03-24 21:09:41 +0100495 if (tmp_tp < minstrel_ht_get_tp_avg(mi, group, tmp_idx, tmp_prob) &&
Thomas Huehn59358392014-09-09 23:22:14 +0200496 (minstrel_mcs_groups[group].streams < tmp_max_streams)) {
497 mi->max_prob_rate = mg->max_group_prob_rate;
Thomas Huehn6a27b2c2015-03-24 21:09:40 +0100498 tmp_tp = minstrel_ht_get_tp_avg(mi, group,
Thomas Huehn50e55a82015-03-24 21:09:41 +0100499 tmp_idx,
500 tmp_prob);
Thomas Huehn59358392014-09-09 23:22:14 +0200501 }
502 }
503}
504
505/*
Felix Fietkauec8aa662010-05-13 16:48:03 +0200506 * Update rate statistics and select new primary rates
507 *
508 * Rules for rate selection:
509 * - max_prob_rate must use only one stream, as a tradeoff between delivery
510 * probability and throughput during strong fluctuations
Thomas Huehn59358392014-09-09 23:22:14 +0200511 * - as long as the max prob rate has a probability of more than 75%, pick
Felix Fietkauec8aa662010-05-13 16:48:03 +0200512 * higher throughput rates, even if the probablity is a bit lower
513 */
514static void
515minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
516{
517 struct minstrel_mcs_group_data *mg;
Thomas Huehn91340732015-03-24 21:09:39 +0100518 struct minstrel_rate_stats *mrs;
Thomas Huehn50e55a82015-03-24 21:09:41 +0100519 int group, i, j, cur_prob;
Karl Beldand4d141c2014-10-20 15:45:59 +0200520 u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES];
521 u16 tmp_cck_tp_rate[MAX_THR_RATES], index;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200522
523 if (mi->ampdu_packets > 0) {
524 mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
525 MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL);
526 mi->ampdu_len = 0;
527 mi->ampdu_packets = 0;
528 }
529
530 mi->sample_slow = 0;
531 mi->sample_count = 0;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200532
Thomas Huehn59358392014-09-09 23:22:14 +0200533 /* Initialize global rate indexes */
534 for(j = 0; j < MAX_THR_RATES; j++){
535 tmp_mcs_tp_rate[j] = 0;
536 tmp_cck_tp_rate[j] = 0;
537 }
Karl Beldanc2eb5b02013-04-18 14:26:20 +0200538
Thomas Huehn59358392014-09-09 23:22:14 +0200539 /* Find best rate sets within all MCS groups*/
540 for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
Felix Fietkauec8aa662010-05-13 16:48:03 +0200541
542 mg = &mi->groups[group];
543 if (!mg->supported)
544 continue;
545
Felix Fietkauec8aa662010-05-13 16:48:03 +0200546 mi->sample_count++;
547
Thomas Huehn59358392014-09-09 23:22:14 +0200548 /* (re)Initialize group rate indexes */
549 for(j = 0; j < MAX_THR_RATES; j++)
550 tmp_group_tp_rate[j] = group;
551
Felix Fietkauec8aa662010-05-13 16:48:03 +0200552 for (i = 0; i < MCS_GROUP_RATES; i++) {
553 if (!(mg->supported & BIT(i)))
554 continue;
555
Karl Beldan351df092013-11-13 23:07:07 +0100556 index = MCS_GROUP_RATES * group + i;
557
Thomas Huehn91340732015-03-24 21:09:39 +0100558 mrs = &mg->rates[i];
559 mrs->retry_updated = false;
560 minstrel_calc_rate_stats(mrs);
Thomas Huehn50e55a82015-03-24 21:09:41 +0100561 cur_prob = mrs->prob_ewma;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200562
Thomas Huehn50e55a82015-03-24 21:09:41 +0100563 if (minstrel_ht_get_tp_avg(mi, group, i, cur_prob) == 0)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200564 continue;
565
Thomas Huehn59358392014-09-09 23:22:14 +0200566 /* Find max throughput rate set */
567 if (group != MINSTREL_CCK_GROUP) {
568 minstrel_ht_sort_best_tp_rates(mi, index,
569 tmp_mcs_tp_rate);
570 } else if (group == MINSTREL_CCK_GROUP) {
571 minstrel_ht_sort_best_tp_rates(mi, index,
572 tmp_cck_tp_rate);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200573 }
574
Thomas Huehn59358392014-09-09 23:22:14 +0200575 /* Find max throughput rate set within a group */
576 minstrel_ht_sort_best_tp_rates(mi, index,
577 tmp_group_tp_rate);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200578
Thomas Huehn59358392014-09-09 23:22:14 +0200579 /* Find max probability rate per group and global */
580 minstrel_ht_set_best_prob_rate(mi, index);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200581 }
Thomas Huehn59358392014-09-09 23:22:14 +0200582
583 memcpy(mg->max_group_tp_rate, tmp_group_tp_rate,
584 sizeof(mg->max_group_tp_rate));
Felix Fietkauec8aa662010-05-13 16:48:03 +0200585 }
586
Thomas Huehn59358392014-09-09 23:22:14 +0200587 /* Assign new rate set per sta */
588 minstrel_ht_assign_best_tp_rates(mi, tmp_mcs_tp_rate, tmp_cck_tp_rate);
589 memcpy(mi->max_tp_rate, tmp_mcs_tp_rate, sizeof(mi->max_tp_rate));
590
591 /* Try to increase robustness of max_prob_rate*/
592 minstrel_ht_prob_rate_reduce_streams(mi);
593
Felix Fietkau96d4ac32013-03-02 21:20:14 +0100594 /* try to sample all available rates during each interval */
595 mi->sample_count *= 8;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200596
Lorenzo Bianconi37feb7e2013-08-27 16:59:47 +0200597#ifdef CONFIG_MAC80211_DEBUGFS
598 /* use fixed index if set */
599 if (mp->fixed_rate_idx != -1) {
Thomas Huehn59358392014-09-09 23:22:14 +0200600 for (i = 0; i < 4; i++)
601 mi->max_tp_rate[i] = mp->fixed_rate_idx;
Lorenzo Bianconi37feb7e2013-08-27 16:59:47 +0200602 mi->max_prob_rate = mp->fixed_rate_idx;
603 }
604#endif
Felix Fietkaua299c6d2013-03-02 21:20:13 +0100605
Thomas Huehn59358392014-09-09 23:22:14 +0200606 /* Reset update timer */
Thomas Huehn91340732015-03-24 21:09:39 +0100607 mi->last_stats_update = jiffies;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200608}
609
610static bool
Felix Fietkaua0497f92013-02-13 10:51:08 +0100611minstrel_ht_txstat_valid(struct minstrel_priv *mp, struct ieee80211_tx_rate *rate)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200612{
Helmut Schaab79296b2011-11-14 15:28:19 +0100613 if (rate->idx < 0)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200614 return false;
615
Helmut Schaab79296b2011-11-14 15:28:19 +0100616 if (!rate->count)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200617 return false;
618
Karl Beldan92082472014-10-21 10:38:38 +0200619 if (rate->flags & IEEE80211_TX_RC_MCS ||
620 rate->flags & IEEE80211_TX_RC_VHT_MCS)
Felix Fietkaua0497f92013-02-13 10:51:08 +0100621 return true;
622
623 return rate->idx == mp->cck_rates[0] ||
624 rate->idx == mp->cck_rates[1] ||
625 rate->idx == mp->cck_rates[2] ||
626 rate->idx == mp->cck_rates[3];
Felix Fietkauec8aa662010-05-13 16:48:03 +0200627}
628
629static void
Thomas Huehn91340732015-03-24 21:09:39 +0100630minstrel_set_next_sample_idx(struct minstrel_ht_sta *mi)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200631{
632 struct minstrel_mcs_group_data *mg;
633
634 for (;;) {
635 mi->sample_group++;
636 mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups);
637 mg = &mi->groups[mi->sample_group];
638
639 if (!mg->supported)
640 continue;
641
642 if (++mg->index >= MCS_GROUP_RATES) {
643 mg->index = 0;
644 if (++mg->column >= ARRAY_SIZE(sample_table))
645 mg->column = 0;
646 }
647 break;
648 }
649}
650
651static void
Karl Beldand4d141c2014-10-20 15:45:59 +0200652minstrel_downgrade_rate(struct minstrel_ht_sta *mi, u16 *idx, bool primary)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200653{
654 int group, orig_group;
655
656 orig_group = group = *idx / MCS_GROUP_RATES;
657 while (group > 0) {
658 group--;
659
660 if (!mi->groups[group].supported)
661 continue;
662
663 if (minstrel_mcs_groups[group].streams >
664 minstrel_mcs_groups[orig_group].streams)
665 continue;
666
667 if (primary)
Thomas Huehn59358392014-09-09 23:22:14 +0200668 *idx = mi->groups[group].max_group_tp_rate[0];
Felix Fietkauec8aa662010-05-13 16:48:03 +0200669 else
Thomas Huehn59358392014-09-09 23:22:14 +0200670 *idx = mi->groups[group].max_group_tp_rate[1];
Felix Fietkauec8aa662010-05-13 16:48:03 +0200671 break;
672 }
673}
674
675static void
Patrick Kelle6048d7632011-11-15 16:44:48 +0100676minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200677{
678 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
679 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
680 u16 tid;
681
Felix Fietkau75769c82014-11-16 00:27:55 +0100682 if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO)
683 return;
684
Felix Fietkauec8aa662010-05-13 16:48:03 +0200685 if (unlikely(!ieee80211_is_data_qos(hdr->frame_control)))
686 return;
687
Johannes Berge133fae2013-08-22 08:36:41 +0200688 if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE)))
Felix Fietkauec8aa662010-05-13 16:48:03 +0200689 return;
690
691 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berga622ab72010-06-10 10:21:39 +0200692 if (likely(sta->ampdu_mlme.tid_tx[tid]))
Felix Fietkauec8aa662010-05-13 16:48:03 +0200693 return;
694
Felix Fietkau7a36b932016-02-18 19:49:18 +0100695 ieee80211_start_tx_ba_session(pubsta, tid, 0);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200696}
697
698static void
699minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
700 struct ieee80211_sta *sta, void *priv_sta,
Felix Fietkau63558a62014-11-19 20:08:10 +0100701 struct ieee80211_tx_info *info)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200702{
703 struct minstrel_ht_sta_priv *msp = priv_sta;
704 struct minstrel_ht_sta *mi = &msp->ht;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200705 struct ieee80211_tx_rate *ar = info->status.rates;
706 struct minstrel_rate_stats *rate, *rate2;
707 struct minstrel_priv *mp = priv;
Felix Fietkaua8566662013-04-22 16:14:42 +0200708 bool last, update = false;
Johannes Berga544ab72012-11-13 21:36:27 +0100709 int i;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200710
711 if (!msp->is_ht)
Felix Fietkau63558a62014-11-19 20:08:10 +0100712 return mac80211_minstrel.tx_status_noskb(priv, sband, sta,
713 &msp->legacy, info);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200714
715 /* This packet was aggregated but doesn't carry status info */
716 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
717 !(info->flags & IEEE80211_TX_STAT_AMPDU))
718 return;
719
Björn Smedman15d46f32010-10-10 22:14:25 +0200720 if (!(info->flags & IEEE80211_TX_STAT_AMPDU)) {
721 info->status.ampdu_ack_len =
722 (info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200723 info->status.ampdu_len = 1;
724 }
725
726 mi->ampdu_packets++;
727 mi->ampdu_len += info->status.ampdu_len;
728
729 if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) {
Felix Fietkauc7317e42010-10-21 02:47:25 +0200730 mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len);
Felix Fietkau52c00a32013-03-05 14:20:19 +0100731 mi->sample_tries = 1;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200732 mi->sample_count--;
733 }
734
Daniel Halperin8d5eab52011-03-09 03:10:18 -0800735 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200736 mi->sample_packets += info->status.ampdu_len;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200737
Felix Fietkaua0497f92013-02-13 10:51:08 +0100738 last = !minstrel_ht_txstat_valid(mp, &ar[0]);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200739 for (i = 0; !last; i++) {
740 last = (i == IEEE80211_TX_MAX_RATES - 1) ||
Felix Fietkaua0497f92013-02-13 10:51:08 +0100741 !minstrel_ht_txstat_valid(mp, &ar[i + 1]);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200742
Felix Fietkaua0497f92013-02-13 10:51:08 +0100743 rate = minstrel_ht_get_stats(mp, mi, &ar[i]);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200744
Björn Smedman15d46f32010-10-10 22:14:25 +0200745 if (last)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200746 rate->success += info->status.ampdu_ack_len;
747
748 rate->attempts += ar[i].count * info->status.ampdu_len;
749 }
750
751 /*
752 * check for sudden death of spatial multiplexing,
753 * downgrade to a lower number of streams if necessary.
754 */
Thomas Huehn59358392014-09-09 23:22:14 +0200755 rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200756 if (rate->attempts > 30 &&
757 MINSTREL_FRAC(rate->success, rate->attempts) <
Felix Fietkaua8566662013-04-22 16:14:42 +0200758 MINSTREL_FRAC(20, 100)) {
Thomas Huehn59358392014-09-09 23:22:14 +0200759 minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true);
Felix Fietkaua8566662013-04-22 16:14:42 +0200760 update = true;
761 }
Felix Fietkauec8aa662010-05-13 16:48:03 +0200762
Thomas Huehn59358392014-09-09 23:22:14 +0200763 rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]);
Ming Leiecc3d5a2010-07-01 23:19:50 +0800764 if (rate2->attempts > 30 &&
765 MINSTREL_FRAC(rate2->success, rate2->attempts) <
Felix Fietkaua8566662013-04-22 16:14:42 +0200766 MINSTREL_FRAC(20, 100)) {
Thomas Huehn59358392014-09-09 23:22:14 +0200767 minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false);
Felix Fietkaua8566662013-04-22 16:14:42 +0200768 update = true;
769 }
Felix Fietkauec8aa662010-05-13 16:48:03 +0200770
Thomas Huehn91340732015-03-24 21:09:39 +0100771 if (time_after(jiffies, mi->last_stats_update +
772 (mp->update_interval / 2 * HZ) / 1000)) {
Felix Fietkaua8566662013-04-22 16:14:42 +0200773 update = true;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200774 minstrel_ht_update_stats(mp, mi);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200775 }
Felix Fietkaua8566662013-04-22 16:14:42 +0200776
777 if (update)
778 minstrel_ht_update_rates(mp, mi);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200779}
780
781static void
782minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
783 int index)
784{
Thomas Huehn91340732015-03-24 21:09:39 +0100785 struct minstrel_rate_stats *mrs;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200786 const struct mcs_group *group;
787 unsigned int tx_time, tx_time_rtscts, tx_time_data;
788 unsigned int cw = mp->cw_min;
Daniel Halperin8fddddf2011-05-10 19:00:45 -0700789 unsigned int ctime = 0;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200790 unsigned int t_slot = 9; /* FIXME */
791 unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len);
Felix Fietkaua0497f92013-02-13 10:51:08 +0100792 unsigned int overhead = 0, overhead_rtscts = 0;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200793
Thomas Huehn91340732015-03-24 21:09:39 +0100794 mrs = minstrel_get_ratestats(mi, index);
795 if (mrs->prob_ewma < MINSTREL_FRAC(1, 10)) {
796 mrs->retry_count = 1;
797 mrs->retry_count_rtscts = 1;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200798 return;
799 }
800
Thomas Huehn91340732015-03-24 21:09:39 +0100801 mrs->retry_count = 2;
802 mrs->retry_count_rtscts = 2;
803 mrs->retry_updated = true;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200804
805 group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
Felix Fietkaued97a132013-03-02 21:20:12 +0100806 tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000;
Daniel Halperin8fddddf2011-05-10 19:00:45 -0700807
808 /* Contention time for first 2 tries */
809 ctime = (t_slot * cw) >> 1;
810 cw = min((cw << 1) | 1, mp->cw_max);
811 ctime += (t_slot * cw) >> 1;
812 cw = min((cw << 1) | 1, mp->cw_max);
813
Felix Fietkaua0497f92013-02-13 10:51:08 +0100814 if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) {
815 overhead = mi->overhead;
816 overhead_rtscts = mi->overhead_rtscts;
817 }
818
Daniel Halperin8fddddf2011-05-10 19:00:45 -0700819 /* Total TX time for data and Contention after first 2 tries */
Felix Fietkaua0497f92013-02-13 10:51:08 +0100820 tx_time = ctime + 2 * (overhead + tx_time_data);
821 tx_time_rtscts = ctime + 2 * (overhead_rtscts + tx_time_data);
Daniel Halperin8fddddf2011-05-10 19:00:45 -0700822
823 /* See how many more tries we can fit inside segment size */
Felix Fietkauec8aa662010-05-13 16:48:03 +0200824 do {
Daniel Halperin8fddddf2011-05-10 19:00:45 -0700825 /* Contention time for this try */
826 ctime = (t_slot * cw) >> 1;
827 cw = min((cw << 1) | 1, mp->cw_max);
828
829 /* Total TX time after this try */
Felix Fietkaua0497f92013-02-13 10:51:08 +0100830 tx_time += ctime + overhead + tx_time_data;
831 tx_time_rtscts += ctime + overhead_rtscts + tx_time_data;
Daniel Halperin8fddddf2011-05-10 19:00:45 -0700832
Felix Fietkauec8aa662010-05-13 16:48:03 +0200833 if (tx_time_rtscts < mp->segment_size)
Thomas Huehn91340732015-03-24 21:09:39 +0100834 mrs->retry_count_rtscts++;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200835 } while ((tx_time < mp->segment_size) &&
Thomas Huehn91340732015-03-24 21:09:39 +0100836 (++mrs->retry_count < mp->max_retry));
Felix Fietkauec8aa662010-05-13 16:48:03 +0200837}
838
839
840static void
841minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
Felix Fietkaua8566662013-04-22 16:14:42 +0200842 struct ieee80211_sta_rates *ratetbl, int offset, int index)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200843{
844 const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
Thomas Huehn91340732015-03-24 21:09:39 +0100845 struct minstrel_rate_stats *mrs;
Felix Fietkaua8566662013-04-22 16:14:42 +0200846 u8 idx;
Karl Beldan3ec373c2014-10-20 15:46:01 +0200847 u16 flags = group->flags;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200848
Thomas Huehn91340732015-03-24 21:09:39 +0100849 mrs = minstrel_get_ratestats(mi, index);
850 if (!mrs->retry_updated)
Felix Fietkauec8aa662010-05-13 16:48:03 +0200851 minstrel_calc_retransmit(mp, mi, index);
852
Thomas Huehn91340732015-03-24 21:09:39 +0100853 if (mrs->prob_ewma < MINSTREL_FRAC(20, 100) || !mrs->retry_count) {
Felix Fietkaua8566662013-04-22 16:14:42 +0200854 ratetbl->rate[offset].count = 2;
855 ratetbl->rate[offset].count_rts = 2;
856 ratetbl->rate[offset].count_cts = 2;
857 } else {
Thomas Huehn91340732015-03-24 21:09:39 +0100858 ratetbl->rate[offset].count = mrs->retry_count;
859 ratetbl->rate[offset].count_cts = mrs->retry_count;
860 ratetbl->rate[offset].count_rts = mrs->retry_count_rtscts;
Felix Fietkaua0497f92013-02-13 10:51:08 +0100861 }
862
Karl Beldan3ec373c2014-10-20 15:46:01 +0200863 if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP)
Felix Fietkaua8566662013-04-22 16:14:42 +0200864 idx = mp->cck_rates[index % ARRAY_SIZE(mp->cck_rates)];
Karl Beldan92082472014-10-21 10:38:38 +0200865 else if (flags & IEEE80211_TX_RC_VHT_MCS)
866 idx = ((group->streams - 1) << 4) |
867 ((index % MCS_GROUP_RATES) & 0xF);
Karl Beldan3ec373c2014-10-20 15:46:01 +0200868 else
Karl Beldan7a5e3fa2013-11-11 13:12:55 +0100869 idx = index % MCS_GROUP_RATES + (group->streams - 1) * 8;
Felix Fietkaua8566662013-04-22 16:14:42 +0200870
Krishna Chaitanyaa3ebb4e2015-06-12 02:34:52 +0530871 /* enable RTS/CTS if needed:
872 * - if station is in dynamic SMPS (and streams > 1)
873 * - for fallback rates, to increase chances of getting through
874 */
Felix Fietkauc36dd3e2016-02-24 12:07:17 +0100875 if (offset > 0 ||
Krishna Chaitanyaa3ebb4e2015-06-12 02:34:52 +0530876 (mi->sta->smps_mode == IEEE80211_SMPS_DYNAMIC &&
877 group->streams > 1)) {
Felix Fietkaua8566662013-04-22 16:14:42 +0200878 ratetbl->rate[offset].count = ratetbl->rate[offset].count_rts;
879 flags |= IEEE80211_TX_RC_USE_RTS_CTS;
880 }
881
882 ratetbl->rate[offset].idx = idx;
883 ratetbl->rate[offset].flags = flags;
884}
885
Felix Fietkau918fe042016-03-03 22:59:01 +0100886static inline int
887minstrel_ht_get_prob_ewma(struct minstrel_ht_sta *mi, int rate)
888{
889 int group = rate / MCS_GROUP_RATES;
890 rate %= MCS_GROUP_RATES;
891 return mi->groups[group].rates[rate].prob_ewma;
892}
893
894static int
895minstrel_ht_get_max_amsdu_len(struct minstrel_ht_sta *mi)
896{
897 int group = mi->max_prob_rate / MCS_GROUP_RATES;
898 const struct mcs_group *g = &minstrel_mcs_groups[group];
899 int rate = mi->max_prob_rate % MCS_GROUP_RATES;
900
901 /* Disable A-MSDU if max_prob_rate is bad */
902 if (mi->groups[group].rates[rate].prob_ewma < MINSTREL_FRAC(50, 100))
903 return 1;
904
905 /* If the rate is slower than single-stream MCS1, make A-MSDU limit small */
906 if (g->duration[rate] > MCS_DURATION(1, 0, 52))
907 return 500;
908
909 /*
910 * If the rate is slower than single-stream MCS4, limit A-MSDU to usual
911 * data packet size
912 */
913 if (g->duration[rate] > MCS_DURATION(1, 0, 104))
914 return 1600;
915
916 /*
917 * If the rate is slower than single-stream MCS7, or if the max throughput
918 * rate success probability is less than 75%, limit A-MSDU to twice the usual
919 * data packet size
920 */
921 if (g->duration[rate] > MCS_DURATION(1, 0, 260) ||
922 (minstrel_ht_get_prob_ewma(mi, mi->max_tp_rate[0]) <
923 MINSTREL_FRAC(75, 100)))
924 return 3200;
925
926 /*
927 * HT A-MPDU limits maximum MPDU size under BA agreement to 4095 bytes.
928 * Since aggregation sessions are started/stopped without txq flush, use
929 * the limit here to avoid the complexity of having to de-aggregate
930 * packets in the queue.
931 */
932 if (!mi->sta->vht_cap.vht_supported)
933 return IEEE80211_MAX_MPDU_LEN_HT_BA;
934
935 /* unlimited */
936 return 0;
937}
938
Felix Fietkaua8566662013-04-22 16:14:42 +0200939static void
940minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
941{
942 struct ieee80211_sta_rates *rates;
943 int i = 0;
944
945 rates = kzalloc(sizeof(*rates), GFP_ATOMIC);
946 if (!rates)
947 return;
948
Thomas Huehn59358392014-09-09 23:22:14 +0200949 /* Start with max_tp_rate[0] */
950 minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]);
Felix Fietkaua8566662013-04-22 16:14:42 +0200951
952 if (mp->hw->max_rates >= 3) {
Thomas Huehn59358392014-09-09 23:22:14 +0200953 /* At least 3 tx rates supported, use max_tp_rate[1] next */
954 minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[1]);
Felix Fietkaua8566662013-04-22 16:14:42 +0200955 }
956
957 if (mp->hw->max_rates >= 2) {
958 /*
959 * At least 2 tx rates supported, use max_prob_rate next */
960 minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_prob_rate);
961 }
962
Felix Fietkau918fe042016-03-03 22:59:01 +0100963 mi->sta->max_rc_amsdu_len = minstrel_ht_get_max_amsdu_len(mi);
Felix Fietkaua8566662013-04-22 16:14:42 +0200964 rates->rate[i].idx = -1;
965 rate_control_set_rates(mp->hw, mi->sta, rates);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200966}
967
968static inline int
969minstrel_get_duration(int index)
970{
971 const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
972 return group->duration[index % MCS_GROUP_RATES];
973}
974
975static int
976minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
977{
Thomas Huehn91340732015-03-24 21:09:39 +0100978 struct minstrel_rate_stats *mrs;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200979 struct minstrel_mcs_group_data *mg;
Thomas Huehn59358392014-09-09 23:22:14 +0200980 unsigned int sample_dur, sample_group, cur_max_tp_streams;
Felix Fietkau06171e92016-03-03 23:25:42 +0100981 int tp_rate1, tp_rate2;
Felix Fietkauec8aa662010-05-13 16:48:03 +0200982 int sample_idx = 0;
983
984 if (mi->sample_wait > 0) {
985 mi->sample_wait--;
986 return -1;
987 }
988
989 if (!mi->sample_tries)
990 return -1;
991
Felix Fietkau965237a2013-03-03 12:49:51 +0100992 sample_group = mi->sample_group;
Karl Beldanf12140c2013-11-11 13:10:49 +0100993 mg = &mi->groups[sample_group];
994 sample_idx = sample_table[mg->column][mg->index];
Thomas Huehn91340732015-03-24 21:09:39 +0100995 minstrel_set_next_sample_idx(mi);
Felix Fietkauec8aa662010-05-13 16:48:03 +0200996
Karl Beldanf12140c2013-11-11 13:10:49 +0100997 if (!(mg->supported & BIT(sample_idx)))
998 return -1;
999
Thomas Huehn91340732015-03-24 21:09:39 +01001000 mrs = &mg->rates[sample_idx];
Karl Beldanf12140c2013-11-11 13:10:49 +01001001 sample_idx += sample_group * MCS_GROUP_RATES;
1002
Felix Fietkau06171e92016-03-03 23:25:42 +01001003 /* Set tp_rate1, tp_rate2 to the highest / second highest max_tp_rate */
1004 if (minstrel_get_duration(mi->max_tp_rate[0]) >
1005 minstrel_get_duration(mi->max_tp_rate[1])) {
1006 tp_rate1 = mi->max_tp_rate[1];
1007 tp_rate2 = mi->max_tp_rate[0];
1008 } else {
1009 tp_rate1 = mi->max_tp_rate[0];
1010 tp_rate2 = mi->max_tp_rate[1];
1011 }
1012
Felix Fietkauec8aa662010-05-13 16:48:03 +02001013 /*
Helmut Schaaba6fa292012-03-14 13:31:11 +01001014 * Sampling might add some overhead (RTS, no aggregation)
Felix Fietkau06171e92016-03-03 23:25:42 +01001015 * to the frame. Hence, don't use sampling for the highest currently
1016 * used highest throughput or probability rate.
Helmut Schaaba6fa292012-03-14 13:31:11 +01001017 */
Felix Fietkau06171e92016-03-03 23:25:42 +01001018 if (sample_idx == mi->max_tp_rate[0] || sample_idx == mi->max_prob_rate)
Helmut Schaaba6fa292012-03-14 13:31:11 +01001019 return -1;
Felix Fietkaua0ca7962013-03-16 17:00:27 +01001020
Helmut Schaaba6fa292012-03-14 13:31:11 +01001021 /*
Felix Fietkaubc96f242013-03-16 17:00:26 +01001022 * Do not sample if the probability is already higher than 95%
1023 * to avoid wasting airtime.
Felix Fietkauec8aa662010-05-13 16:48:03 +02001024 */
Thomas Huehn91340732015-03-24 21:09:39 +01001025 if (mrs->prob_ewma > MINSTREL_FRAC(95, 100))
Daniel Halperin8d5eab52011-03-09 03:10:18 -08001026 return -1;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001027
1028 /*
1029 * Make sure that lower rates get sampled only occasionally,
1030 * if the link is working perfectly.
1031 */
Thomas Huehn59358392014-09-09 23:22:14 +02001032
Felix Fietkau06171e92016-03-03 23:25:42 +01001033 cur_max_tp_streams = minstrel_mcs_groups[tp_rate1 /
Thomas Huehn59358392014-09-09 23:22:14 +02001034 MCS_GROUP_RATES].streams;
Felix Fietkau965237a2013-03-03 12:49:51 +01001035 sample_dur = minstrel_get_duration(sample_idx);
Felix Fietkau06171e92016-03-03 23:25:42 +01001036 if (sample_dur >= minstrel_get_duration(tp_rate2) &&
Thomas Huehn59358392014-09-09 23:22:14 +02001037 (cur_max_tp_streams - 1 <
Felix Fietkau965237a2013-03-03 12:49:51 +01001038 minstrel_mcs_groups[sample_group].streams ||
1039 sample_dur >= minstrel_get_duration(mi->max_prob_rate))) {
Thomas Huehn91340732015-03-24 21:09:39 +01001040 if (mrs->sample_skipped < 20)
Daniel Halperin8d5eab52011-03-09 03:10:18 -08001041 return -1;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001042
1043 if (mi->sample_slow++ > 2)
Daniel Halperin8d5eab52011-03-09 03:10:18 -08001044 return -1;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001045 }
Felix Fietkau098b8af2013-03-03 12:49:52 +01001046 mi->sample_tries--;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001047
1048 return sample_idx;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001049}
1050
1051static void
Felix Fietkaua0497f92013-02-13 10:51:08 +01001052minstrel_ht_check_cck_shortpreamble(struct minstrel_priv *mp,
1053 struct minstrel_ht_sta *mi, bool val)
1054{
1055 u8 supported = mi->groups[MINSTREL_CCK_GROUP].supported;
1056
1057 if (!supported || !mi->cck_supported_short)
1058 return;
1059
1060 if (supported & (mi->cck_supported_short << (val * 4)))
1061 return;
1062
1063 supported ^= mi->cck_supported_short | (mi->cck_supported_short << 4);
1064 mi->groups[MINSTREL_CCK_GROUP].supported = supported;
1065}
1066
1067static void
Felix Fietkauec8aa662010-05-13 16:48:03 +02001068minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
1069 struct ieee80211_tx_rate_control *txrc)
1070{
Felix Fietkaua8566662013-04-22 16:14:42 +02001071 const struct mcs_group *sample_group;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001072 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
Felix Fietkaua8566662013-04-22 16:14:42 +02001073 struct ieee80211_tx_rate *rate = &info->status.rates[0];
Felix Fietkauec8aa662010-05-13 16:48:03 +02001074 struct minstrel_ht_sta_priv *msp = priv_sta;
1075 struct minstrel_ht_sta *mi = &msp->ht;
1076 struct minstrel_priv *mp = priv;
1077 int sample_idx;
1078
1079 if (rate_control_send_low(sta, priv_sta, txrc))
1080 return;
1081
1082 if (!msp->is_ht)
1083 return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc);
1084
Felix Fietkau95943422014-11-19 20:08:07 +01001085 if (!(info->flags & IEEE80211_TX_CTL_AMPDU) &&
1086 mi->max_prob_rate / MCS_GROUP_RATES != MINSTREL_CCK_GROUP)
1087 minstrel_aggr_check(sta, txrc->skb);
1088
Felix Fietkauec8aa662010-05-13 16:48:03 +02001089 info->flags |= mi->tx_flags;
Felix Fietkaua0497f92013-02-13 10:51:08 +01001090 minstrel_ht_check_cck_shortpreamble(mp, mi, txrc->short_preamble);
Helmut Schaa6de062c2011-08-01 11:32:53 +02001091
Lorenzo Bianconi37feb7e2013-08-27 16:59:47 +02001092#ifdef CONFIG_MAC80211_DEBUGFS
1093 if (mp->fixed_rate_idx != -1)
1094 return;
1095#endif
1096
Helmut Schaa6de062c2011-08-01 11:32:53 +02001097 /* Don't use EAPOL frames for sampling on non-mrr hw */
1098 if (mp->hw->max_rates == 1 &&
Johannes Bergaf61a162013-07-02 18:09:12 +02001099 (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO))
Helmut Schaa6de062c2011-08-01 11:32:53 +02001100 sample_idx = -1;
1101 else
1102 sample_idx = minstrel_get_sample_rate(mp, mi);
Zefir Kurtisi24f75802011-05-20 20:29:17 +02001103
Felix Fietkauec8aa662010-05-13 16:48:03 +02001104 mi->total_packets++;
1105
1106 /* wraparound */
1107 if (mi->total_packets == ~0) {
1108 mi->total_packets = 0;
1109 mi->sample_packets = 0;
1110 }
Felix Fietkaua8566662013-04-22 16:14:42 +02001111
1112 if (sample_idx < 0)
1113 return;
1114
1115 sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES];
1116 info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
Felix Fietkau1cd15852013-06-28 21:04:35 +02001117 rate->count = 1;
1118
1119 if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) {
1120 int idx = sample_idx % ARRAY_SIZE(mp->cck_rates);
1121 rate->idx = mp->cck_rates[idx];
Karl Beldan92082472014-10-21 10:38:38 +02001122 } else if (sample_group->flags & IEEE80211_TX_RC_VHT_MCS) {
1123 ieee80211_rate_set_vht(rate, sample_idx % MCS_GROUP_RATES,
1124 sample_group->streams);
Karl Beldan3ec373c2014-10-20 15:46:01 +02001125 } else {
1126 rate->idx = sample_idx % MCS_GROUP_RATES +
1127 (sample_group->streams - 1) * 8;
Felix Fietkau1cd15852013-06-28 21:04:35 +02001128 }
1129
Karl Beldan3ec373c2014-10-20 15:46:01 +02001130 rate->flags = sample_group->flags;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001131}
1132
1133static void
Felix Fietkaua0497f92013-02-13 10:51:08 +01001134minstrel_ht_update_cck(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
1135 struct ieee80211_supported_band *sband,
1136 struct ieee80211_sta *sta)
1137{
1138 int i;
1139
1140 if (sband->band != IEEE80211_BAND_2GHZ)
1141 return;
1142
Johannes Berg30686bf2015-06-02 21:39:54 +02001143 if (!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES))
Felix Fietkau2dfca312013-08-20 19:43:54 +02001144 return;
1145
Felix Fietkaua0497f92013-02-13 10:51:08 +01001146 mi->cck_supported = 0;
1147 mi->cck_supported_short = 0;
1148 for (i = 0; i < 4; i++) {
1149 if (!rate_supported(sta, sband->band, mp->cck_rates[i]))
1150 continue;
1151
1152 mi->cck_supported |= BIT(i);
1153 if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE)
1154 mi->cck_supported_short |= BIT(i);
1155 }
1156
1157 mi->groups[MINSTREL_CCK_GROUP].supported = mi->cck_supported;
1158}
1159
1160static void
Felix Fietkauec8aa662010-05-13 16:48:03 +02001161minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
Simon Wunderlich3de805c2013-07-08 16:55:50 +02001162 struct cfg80211_chan_def *chandef,
Johannes Berg64f68e52012-03-28 10:58:37 +02001163 struct ieee80211_sta *sta, void *priv_sta)
Felix Fietkauec8aa662010-05-13 16:48:03 +02001164{
1165 struct minstrel_priv *mp = priv;
1166 struct minstrel_ht_sta_priv *msp = priv_sta;
1167 struct minstrel_ht_sta *mi = &msp->ht;
1168 struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001169 u16 sta_cap = sta->ht_cap.cap;
Karl Beldan92082472014-10-21 10:38:38 +02001170 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
1171 int use_vht;
Felix Fietkau4dc217d2011-03-25 15:30:38 +01001172 int n_supported = 0;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001173 int ack_dur;
1174 int stbc;
1175 int i;
1176
1177 /* fall back to the old minstrel for legacy stations */
Felix Fietkau4dc217d2011-03-25 15:30:38 +01001178 if (!sta->ht_cap.ht_supported)
1179 goto use_legacy;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001180
Karl Beldan8a0ee4f2014-10-20 15:46:00 +02001181 BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) != MINSTREL_GROUPS_NB);
Felix Fietkauec8aa662010-05-13 16:48:03 +02001182
Karl Beldan92082472014-10-21 10:38:38 +02001183#ifdef CONFIG_MAC80211_RC_MINSTREL_VHT
1184 if (vht_cap->vht_supported)
1185 use_vht = vht_cap->vht_mcs.tx_mcs_map != cpu_to_le16(~0);
1186 else
1187#endif
1188 use_vht = 0;
1189
Felix Fietkauec8aa662010-05-13 16:48:03 +02001190 msp->is_ht = true;
1191 memset(mi, 0, sizeof(*mi));
Felix Fietkaua8566662013-04-22 16:14:42 +02001192
1193 mi->sta = sta;
Thomas Huehn91340732015-03-24 21:09:39 +01001194 mi->last_stats_update = jiffies;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001195
Simon Wunderlich438b61b2013-07-08 16:55:51 +02001196 ack_dur = ieee80211_frame_duration(sband->band, 10, 60, 1, 1, 0);
1197 mi->overhead = ieee80211_frame_duration(sband->band, 0, 60, 1, 1, 0);
1198 mi->overhead += ack_dur;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001199 mi->overhead_rtscts = mi->overhead + 2 * ack_dur;
1200
1201 mi->avg_ampdu_len = MINSTREL_FRAC(1, 1);
1202
1203 /* When using MRR, sample more on the first attempt, without delay */
1204 if (mp->has_mrr) {
1205 mi->sample_count = 16;
1206 mi->sample_wait = 0;
1207 } else {
1208 mi->sample_count = 8;
1209 mi->sample_wait = 8;
1210 }
1211 mi->sample_tries = 4;
1212
Karl Beldan92082472014-10-21 10:38:38 +02001213 /* TODO tx_flags for vht - ATM the RC API is not fine-grained enough */
1214 if (!use_vht) {
1215 stbc = (sta_cap & IEEE80211_HT_CAP_RX_STBC) >>
1216 IEEE80211_HT_CAP_RX_STBC_SHIFT;
1217 mi->tx_flags |= stbc << IEEE80211_TX_CTL_STBC_SHIFT;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001218
Karl Beldan92082472014-10-21 10:38:38 +02001219 if (sta_cap & IEEE80211_HT_CAP_LDPC_CODING)
1220 mi->tx_flags |= IEEE80211_TX_CTL_LDPC;
1221 }
Felix Fietkauec8aa662010-05-13 16:48:03 +02001222
Felix Fietkauec8aa662010-05-13 16:48:03 +02001223 for (i = 0; i < ARRAY_SIZE(mi->groups); i++) {
Karl Beldan3ec373c2014-10-20 15:46:01 +02001224 u32 gflags = minstrel_mcs_groups[i].flags;
Karl Beldan92082472014-10-21 10:38:38 +02001225 int bw, nss;
Karl Beldan3ec373c2014-10-20 15:46:01 +02001226
Felix Fietkauec8aa662010-05-13 16:48:03 +02001227 mi->groups[i].supported = 0;
Felix Fietkaua0497f92013-02-13 10:51:08 +01001228 if (i == MINSTREL_CCK_GROUP) {
1229 minstrel_ht_update_cck(mp, mi, sband, sta);
1230 continue;
1231 }
1232
Karl Beldan3ec373c2014-10-20 15:46:01 +02001233 if (gflags & IEEE80211_TX_RC_SHORT_GI) {
1234 if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
Johannes Berge1a0c6b2013-02-07 11:47:44 +01001235 if (!(sta_cap & IEEE80211_HT_CAP_SGI_40))
1236 continue;
1237 } else {
1238 if (!(sta_cap & IEEE80211_HT_CAP_SGI_20))
1239 continue;
1240 }
Felix Fietkauec8aa662010-05-13 16:48:03 +02001241 }
1242
Karl Beldan3ec373c2014-10-20 15:46:01 +02001243 if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH &&
Johannes Berge1a0c6b2013-02-07 11:47:44 +01001244 sta->bandwidth < IEEE80211_STA_RX_BW_40)
Felix Fietkauec8aa662010-05-13 16:48:03 +02001245 continue;
1246
Karl Beldan92082472014-10-21 10:38:38 +02001247 nss = minstrel_mcs_groups[i].streams;
1248
Helmut Schaae9219772012-03-09 14:13:45 +01001249 /* Mark MCS > 7 as unsupported if STA is in static SMPS mode */
Karl Beldan92082472014-10-21 10:38:38 +02001250 if (sta->smps_mode == IEEE80211_SMPS_STATIC && nss > 1)
Helmut Schaae9219772012-03-09 14:13:45 +01001251 continue;
1252
Karl Beldan92082472014-10-21 10:38:38 +02001253 /* HT rate */
1254 if (gflags & IEEE80211_TX_RC_MCS) {
1255#ifdef CONFIG_MAC80211_RC_MINSTREL_VHT
Karl Beldan9ffe9042014-10-24 14:34:49 +02001256 if (use_vht && minstrel_vht_only)
Karl Beldan92082472014-10-21 10:38:38 +02001257 continue;
1258#endif
1259 mi->groups[i].supported = mcs->rx_mask[nss - 1];
1260 if (mi->groups[i].supported)
1261 n_supported++;
1262 continue;
1263 }
1264
1265 /* VHT rate */
1266 if (!vht_cap->vht_supported ||
1267 WARN_ON(!(gflags & IEEE80211_TX_RC_VHT_MCS)) ||
1268 WARN_ON(gflags & IEEE80211_TX_RC_160_MHZ_WIDTH))
1269 continue;
1270
1271 if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH) {
1272 if (sta->bandwidth < IEEE80211_STA_RX_BW_80 ||
1273 ((gflags & IEEE80211_TX_RC_SHORT_GI) &&
1274 !(vht_cap->cap & IEEE80211_VHT_CAP_SHORT_GI_80))) {
1275 continue;
1276 }
1277 }
1278
1279 if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1280 bw = BW_40;
1281 else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1282 bw = BW_80;
1283 else
1284 bw = BW_20;
1285
1286 mi->groups[i].supported = minstrel_get_valid_vht_rates(bw, nss,
1287 vht_cap->vht_mcs.tx_mcs_map);
Felix Fietkau4dc217d2011-03-25 15:30:38 +01001288
1289 if (mi->groups[i].supported)
1290 n_supported++;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001291 }
Felix Fietkau4dc217d2011-03-25 15:30:38 +01001292
1293 if (!n_supported)
1294 goto use_legacy;
1295
Felix Fietkaua8566662013-04-22 16:14:42 +02001296 /* create an initial rate table with the lowest supported rates */
Karl Beldana3647362013-04-18 14:26:21 +02001297 minstrel_ht_update_stats(mp, mi);
Felix Fietkaua8566662013-04-22 16:14:42 +02001298 minstrel_ht_update_rates(mp, mi);
Karl Beldana3647362013-04-18 14:26:21 +02001299
Felix Fietkau4dc217d2011-03-25 15:30:38 +01001300 return;
1301
1302use_legacy:
1303 msp->is_ht = false;
1304 memset(&msp->legacy, 0, sizeof(msp->legacy));
1305 msp->legacy.r = msp->ratelist;
1306 msp->legacy.sample_table = msp->sample_table;
Simon Wunderlich3de805c2013-07-08 16:55:50 +02001307 return mac80211_minstrel.rate_init(priv, sband, chandef, sta,
1308 &msp->legacy);
Felix Fietkauec8aa662010-05-13 16:48:03 +02001309}
1310
1311static void
1312minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband,
Simon Wunderlich3de805c2013-07-08 16:55:50 +02001313 struct cfg80211_chan_def *chandef,
Felix Fietkauec8aa662010-05-13 16:48:03 +02001314 struct ieee80211_sta *sta, void *priv_sta)
1315{
Simon Wunderlich3de805c2013-07-08 16:55:50 +02001316 minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta);
Felix Fietkauec8aa662010-05-13 16:48:03 +02001317}
1318
1319static void
1320minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband,
Simon Wunderlich3de805c2013-07-08 16:55:50 +02001321 struct cfg80211_chan_def *chandef,
Felix Fietkauec8aa662010-05-13 16:48:03 +02001322 struct ieee80211_sta *sta, void *priv_sta,
Johannes Berg64f68e52012-03-28 10:58:37 +02001323 u32 changed)
Felix Fietkauec8aa662010-05-13 16:48:03 +02001324{
Simon Wunderlich3de805c2013-07-08 16:55:50 +02001325 minstrel_ht_update_caps(priv, sband, chandef, sta, priv_sta);
Felix Fietkauec8aa662010-05-13 16:48:03 +02001326}
1327
1328static void *
1329minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
1330{
1331 struct ieee80211_supported_band *sband;
1332 struct minstrel_ht_sta_priv *msp;
1333 struct minstrel_priv *mp = priv;
1334 struct ieee80211_hw *hw = mp->hw;
1335 int max_rates = 0;
1336 int i;
1337
1338 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1339 sband = hw->wiphy->bands[i];
1340 if (sband && sband->n_bitrates > max_rates)
1341 max_rates = sband->n_bitrates;
1342 }
1343
Thomas Huehn472dd352012-06-29 06:26:27 -07001344 msp = kzalloc(sizeof(*msp), gfp);
Felix Fietkauec8aa662010-05-13 16:48:03 +02001345 if (!msp)
1346 return NULL;
1347
1348 msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp);
1349 if (!msp->ratelist)
1350 goto error;
1351
1352 msp->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp);
1353 if (!msp->sample_table)
1354 goto error1;
1355
1356 return msp;
1357
1358error1:
Dan Carpenter7e988012010-07-22 13:14:19 +02001359 kfree(msp->ratelist);
Felix Fietkauec8aa662010-05-13 16:48:03 +02001360error:
1361 kfree(msp);
1362 return NULL;
1363}
1364
1365static void
1366minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta)
1367{
1368 struct minstrel_ht_sta_priv *msp = priv_sta;
1369
1370 kfree(msp->sample_table);
1371 kfree(msp->ratelist);
1372 kfree(msp);
1373}
1374
1375static void *
1376minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
1377{
1378 return mac80211_minstrel.alloc(hw, debugfsdir);
1379}
1380
1381static void
1382minstrel_ht_free(void *priv)
1383{
1384 mac80211_minstrel.free(priv);
1385}
1386
Antonio Quartullicca674d2014-05-19 21:53:20 +02001387static u32 minstrel_ht_get_expected_throughput(void *priv_sta)
1388{
1389 struct minstrel_ht_sta_priv *msp = priv_sta;
1390 struct minstrel_ht_sta *mi = &msp->ht;
Thomas Huehn50e55a82015-03-24 21:09:41 +01001391 int i, j, prob, tp_avg;
Antonio Quartullicca674d2014-05-19 21:53:20 +02001392
1393 if (!msp->is_ht)
1394 return mac80211_minstrel.get_expected_throughput(priv_sta);
1395
Thomas Huehn59358392014-09-09 23:22:14 +02001396 i = mi->max_tp_rate[0] / MCS_GROUP_RATES;
1397 j = mi->max_tp_rate[0] % MCS_GROUP_RATES;
Thomas Huehn50e55a82015-03-24 21:09:41 +01001398 prob = mi->groups[i].rates[j].prob_ewma;
Antonio Quartullicca674d2014-05-19 21:53:20 +02001399
Thomas Huehn6a27b2c2015-03-24 21:09:40 +01001400 /* convert tp_avg from pkt per second in kbps */
Sven Eckelmann212c5a52016-02-02 08:12:26 +01001401 tp_avg = minstrel_ht_get_tp_avg(mi, i, j, prob) * 10;
1402 tp_avg = tp_avg * AVG_PKT_SIZE * 8 / 1024;
Thomas Huehn6a27b2c2015-03-24 21:09:40 +01001403
1404 return tp_avg;
Antonio Quartullicca674d2014-05-19 21:53:20 +02001405}
1406
Johannes Berg631ad702014-01-20 23:29:34 +01001407static const struct rate_control_ops mac80211_minstrel_ht = {
Felix Fietkauec8aa662010-05-13 16:48:03 +02001408 .name = "minstrel_ht",
Felix Fietkau63558a62014-11-19 20:08:10 +01001409 .tx_status_noskb = minstrel_ht_tx_status,
Felix Fietkauec8aa662010-05-13 16:48:03 +02001410 .get_rate = minstrel_ht_get_rate,
1411 .rate_init = minstrel_ht_rate_init,
1412 .rate_update = minstrel_ht_rate_update,
1413 .alloc_sta = minstrel_ht_alloc_sta,
1414 .free_sta = minstrel_ht_free_sta,
1415 .alloc = minstrel_ht_alloc,
1416 .free = minstrel_ht_free,
1417#ifdef CONFIG_MAC80211_DEBUGFS
1418 .add_sta_debugfs = minstrel_ht_add_sta_debugfs,
1419 .remove_sta_debugfs = minstrel_ht_remove_sta_debugfs,
1420#endif
Antonio Quartullicca674d2014-05-19 21:53:20 +02001421 .get_expected_throughput = minstrel_ht_get_expected_throughput,
Felix Fietkauec8aa662010-05-13 16:48:03 +02001422};
1423
1424
Johannes Bergf6e1a732014-01-21 00:32:52 +01001425static void __init init_sample_table(void)
Felix Fietkauec8aa662010-05-13 16:48:03 +02001426{
1427 int col, i, new_idx;
1428 u8 rnd[MCS_GROUP_RATES];
1429
1430 memset(sample_table, 0xff, sizeof(sample_table));
1431 for (col = 0; col < SAMPLE_COLUMNS; col++) {
Karl Beldanf7d8ad82013-11-13 10:54:19 +01001432 prandom_bytes(rnd, sizeof(rnd));
Felix Fietkauec8aa662010-05-13 16:48:03 +02001433 for (i = 0; i < MCS_GROUP_RATES; i++) {
Felix Fietkauec8aa662010-05-13 16:48:03 +02001434 new_idx = (i + rnd[i]) % MCS_GROUP_RATES;
Felix Fietkauec8aa662010-05-13 16:48:03 +02001435 while (sample_table[col][new_idx] != 0xff)
1436 new_idx = (new_idx + 1) % MCS_GROUP_RATES;
1437
1438 sample_table[col][new_idx] = i;
1439 }
1440 }
1441}
1442
1443int __init
1444rc80211_minstrel_ht_init(void)
1445{
1446 init_sample_table();
1447 return ieee80211_rate_control_register(&mac80211_minstrel_ht);
1448}
1449
1450void
1451rc80211_minstrel_ht_exit(void)
1452{
1453 ieee80211_rate_control_unregister(&mac80211_minstrel_ht);
1454}