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1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3 *
4 * Copyright(c) 2005 - 2014, 2018 - 2021 Intel Corporation. All rights reserved.
5 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
6 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
7 *****************************************************************************/
8#include <linux/kernel.h>
9#include <linux/skbuff.h>
10#include <linux/slab.h>
11#include <net/mac80211.h>
12
13#include <linux/netdevice.h>
14#include <linux/etherdevice.h>
15#include <linux/delay.h>
16
17#include <linux/workqueue.h>
18#include "rs.h"
19#include "fw-api.h"
20#include "sta.h"
21#include "iwl-op-mode.h"
22#include "mvm.h"
23#include "debugfs.h"
24
25#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
26
27/* Calculations of success ratio are done in fixed point where 12800 is 100%.
28 * Use this macro when dealing with thresholds consts set as a percentage
29 */
30#define RS_PERCENT(x) (128 * x)
31
32static u8 rs_ht_to_legacy[] = {
33 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
34 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
35 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
36 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
37 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
38 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
39 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
40 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
41 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
42 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
43};
44
45static const u8 ant_toggle_lookup[] = {
46 [ANT_NONE] = ANT_NONE,
47 [ANT_A] = ANT_B,
48 [ANT_B] = ANT_A,
49 [ANT_AB] = ANT_AB,
50};
51
52#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
53 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
54 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
55 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
56 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
57 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
58 IWL_RATE_##rp##M_INDEX, \
59 IWL_RATE_##rn##M_INDEX }
60
61#define IWL_DECLARE_MCS_RATE(s) \
62 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
63 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
64 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
65 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
66 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
67 IWL_RATE_INVM_INDEX, \
68 IWL_RATE_INVM_INDEX }
69
70/*
71 * Parameter order:
72 * rate, ht rate, prev rate, next rate
73 *
74 * If there isn't a valid next or previous rate then INV is used which
75 * maps to IWL_RATE_INVALID
76 *
77 */
78static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
79 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
80 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
81 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
82 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
83 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
84 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
85 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
86 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
87 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
88 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
89 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
90 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
91 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
92 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
93 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
94};
95
96enum rs_action {
97 RS_ACTION_STAY = 0,
98 RS_ACTION_DOWNSCALE = -1,
99 RS_ACTION_UPSCALE = 1,
100};
101
102enum rs_column_mode {
103 RS_INVALID = 0,
104 RS_LEGACY,
105 RS_SISO,
106 RS_MIMO2,
107};
108
109#define MAX_NEXT_COLUMNS 7
110#define MAX_COLUMN_CHECKS 3
111
112struct rs_tx_column;
113
114typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
115 struct ieee80211_sta *sta,
116 struct rs_rate *rate,
117 const struct rs_tx_column *next_col);
118
119struct rs_tx_column {
120 enum rs_column_mode mode;
121 u8 ant;
122 bool sgi;
123 enum rs_column next_columns[MAX_NEXT_COLUMNS];
124 allow_column_func_t checks[MAX_COLUMN_CHECKS];
125};
126
127static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
128 struct rs_rate *rate,
129 const struct rs_tx_column *next_col)
130{
131 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
132}
133
134static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
135 struct rs_rate *rate,
136 const struct rs_tx_column *next_col)
137{
138 if (!sta->deflink.ht_cap.ht_supported)
139 return false;
140
141 if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC)
142 return false;
143
144 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
145 return false;
146
147 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
148 return false;
149
150 if (mvm->nvm_data->sku_cap_mimo_disabled)
151 return false;
152
153 return true;
154}
155
156static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
157 struct rs_rate *rate,
158 const struct rs_tx_column *next_col)
159{
160 if (!sta->deflink.ht_cap.ht_supported)
161 return false;
162
163 return true;
164}
165
166static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
167 struct rs_rate *rate,
168 const struct rs_tx_column *next_col)
169{
170 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
171 struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
172
173 if (is_ht20(rate) && (ht_cap->cap &
174 IEEE80211_HT_CAP_SGI_20))
175 return true;
176 if (is_ht40(rate) && (ht_cap->cap &
177 IEEE80211_HT_CAP_SGI_40))
178 return true;
179 if (is_ht80(rate) && (vht_cap->cap &
180 IEEE80211_VHT_CAP_SHORT_GI_80))
181 return true;
182 if (is_ht160(rate) && (vht_cap->cap &
183 IEEE80211_VHT_CAP_SHORT_GI_160))
184 return true;
185
186 return false;
187}
188
189static const struct rs_tx_column rs_tx_columns[] = {
190 [RS_COLUMN_LEGACY_ANT_A] = {
191 .mode = RS_LEGACY,
192 .ant = ANT_A,
193 .next_columns = {
194 RS_COLUMN_LEGACY_ANT_B,
195 RS_COLUMN_SISO_ANT_A,
196 RS_COLUMN_MIMO2,
197 RS_COLUMN_INVALID,
198 RS_COLUMN_INVALID,
199 RS_COLUMN_INVALID,
200 RS_COLUMN_INVALID,
201 },
202 .checks = {
203 rs_ant_allow,
204 },
205 },
206 [RS_COLUMN_LEGACY_ANT_B] = {
207 .mode = RS_LEGACY,
208 .ant = ANT_B,
209 .next_columns = {
210 RS_COLUMN_LEGACY_ANT_A,
211 RS_COLUMN_SISO_ANT_B,
212 RS_COLUMN_MIMO2,
213 RS_COLUMN_INVALID,
214 RS_COLUMN_INVALID,
215 RS_COLUMN_INVALID,
216 RS_COLUMN_INVALID,
217 },
218 .checks = {
219 rs_ant_allow,
220 },
221 },
222 [RS_COLUMN_SISO_ANT_A] = {
223 .mode = RS_SISO,
224 .ant = ANT_A,
225 .next_columns = {
226 RS_COLUMN_SISO_ANT_B,
227 RS_COLUMN_MIMO2,
228 RS_COLUMN_SISO_ANT_A_SGI,
229 RS_COLUMN_LEGACY_ANT_A,
230 RS_COLUMN_LEGACY_ANT_B,
231 RS_COLUMN_INVALID,
232 RS_COLUMN_INVALID,
233 },
234 .checks = {
235 rs_siso_allow,
236 rs_ant_allow,
237 },
238 },
239 [RS_COLUMN_SISO_ANT_B] = {
240 .mode = RS_SISO,
241 .ant = ANT_B,
242 .next_columns = {
243 RS_COLUMN_SISO_ANT_A,
244 RS_COLUMN_MIMO2,
245 RS_COLUMN_SISO_ANT_B_SGI,
246 RS_COLUMN_LEGACY_ANT_A,
247 RS_COLUMN_LEGACY_ANT_B,
248 RS_COLUMN_INVALID,
249 RS_COLUMN_INVALID,
250 },
251 .checks = {
252 rs_siso_allow,
253 rs_ant_allow,
254 },
255 },
256 [RS_COLUMN_SISO_ANT_A_SGI] = {
257 .mode = RS_SISO,
258 .ant = ANT_A,
259 .sgi = true,
260 .next_columns = {
261 RS_COLUMN_SISO_ANT_B_SGI,
262 RS_COLUMN_MIMO2_SGI,
263 RS_COLUMN_SISO_ANT_A,
264 RS_COLUMN_LEGACY_ANT_A,
265 RS_COLUMN_LEGACY_ANT_B,
266 RS_COLUMN_INVALID,
267 RS_COLUMN_INVALID,
268 },
269 .checks = {
270 rs_siso_allow,
271 rs_ant_allow,
272 rs_sgi_allow,
273 },
274 },
275 [RS_COLUMN_SISO_ANT_B_SGI] = {
276 .mode = RS_SISO,
277 .ant = ANT_B,
278 .sgi = true,
279 .next_columns = {
280 RS_COLUMN_SISO_ANT_A_SGI,
281 RS_COLUMN_MIMO2_SGI,
282 RS_COLUMN_SISO_ANT_B,
283 RS_COLUMN_LEGACY_ANT_A,
284 RS_COLUMN_LEGACY_ANT_B,
285 RS_COLUMN_INVALID,
286 RS_COLUMN_INVALID,
287 },
288 .checks = {
289 rs_siso_allow,
290 rs_ant_allow,
291 rs_sgi_allow,
292 },
293 },
294 [RS_COLUMN_MIMO2] = {
295 .mode = RS_MIMO2,
296 .ant = ANT_AB,
297 .next_columns = {
298 RS_COLUMN_SISO_ANT_A,
299 RS_COLUMN_MIMO2_SGI,
300 RS_COLUMN_LEGACY_ANT_A,
301 RS_COLUMN_LEGACY_ANT_B,
302 RS_COLUMN_INVALID,
303 RS_COLUMN_INVALID,
304 RS_COLUMN_INVALID,
305 },
306 .checks = {
307 rs_mimo_allow,
308 },
309 },
310 [RS_COLUMN_MIMO2_SGI] = {
311 .mode = RS_MIMO2,
312 .ant = ANT_AB,
313 .sgi = true,
314 .next_columns = {
315 RS_COLUMN_SISO_ANT_A_SGI,
316 RS_COLUMN_MIMO2,
317 RS_COLUMN_LEGACY_ANT_A,
318 RS_COLUMN_LEGACY_ANT_B,
319 RS_COLUMN_INVALID,
320 RS_COLUMN_INVALID,
321 RS_COLUMN_INVALID,
322 },
323 .checks = {
324 rs_mimo_allow,
325 rs_sgi_allow,
326 },
327 },
328};
329
330static inline u8 rs_extract_rate(u32 rate_n_flags)
331{
332 /* also works for HT because bits 7:6 are zero there */
333 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK_V1);
334}
335
336static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
337{
338 int idx = 0;
339
340 if (rate_n_flags & RATE_MCS_HT_MSK_V1) {
341 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK_V1;
342 idx += IWL_RATE_MCS_0_INDEX;
343
344 /* skip 9M not supported in HT*/
345 if (idx >= IWL_RATE_9M_INDEX)
346 idx += 1;
347 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
348 return idx;
349 } else if (rate_n_flags & RATE_MCS_VHT_MSK_V1 ||
350 rate_n_flags & RATE_MCS_HE_MSK_V1) {
351 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
352 idx += IWL_RATE_MCS_0_INDEX;
353
354 /* skip 9M not supported in VHT*/
355 if (idx >= IWL_RATE_9M_INDEX)
356 idx++;
357 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
358 return idx;
359 if ((rate_n_flags & RATE_MCS_HE_MSK_V1) &&
360 idx <= IWL_LAST_HE_RATE)
361 return idx;
362 } else {
363 /* legacy rate format, search for match in table */
364
365 u8 legacy_rate = rs_extract_rate(rate_n_flags);
366 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
367 if (iwl_rates[idx].plcp == legacy_rate)
368 return idx;
369 }
370
371 return IWL_RATE_INVALID;
372}
373
374static void rs_rate_scale_perform(struct iwl_mvm *mvm,
375 struct ieee80211_sta *sta,
376 struct iwl_lq_sta *lq_sta,
377 int tid, bool ndp);
378static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
379 struct ieee80211_sta *sta,
380 struct iwl_lq_sta *lq_sta,
381 const struct rs_rate *initial_rate);
382static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
383
384/*
385 * The following tables contain the expected throughput metrics for all rates
386 *
387 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
388 *
389 * where invalid entries are zeros.
390 *
391 * CCK rates are only valid in legacy table and will only be used in G
392 * (2.4 GHz) band.
393 */
394static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
395 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
396};
397
398/* Expected TpT tables. 4 indexes:
399 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
400 */
401static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
402 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
403 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
404 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
405 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
406};
407
408static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
409 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
410 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
411 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
412 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
413};
414
415static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
416 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
417 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
418 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
419 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
420};
421
422static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
423 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
424 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
425 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
426 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
427};
428
429static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
430 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
431 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
432 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
433 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
434};
435
436static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
437 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
438 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
439 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
440 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
441};
442
443static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
444 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
445 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
446 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
447 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
448};
449
450static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
451 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
452 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
453 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
454 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
455};
456
457static const char *rs_pretty_lq_type(enum iwl_table_type type)
458{
459 static const char * const lq_types[] = {
460 [LQ_NONE] = "NONE",
461 [LQ_LEGACY_A] = "LEGACY_A",
462 [LQ_LEGACY_G] = "LEGACY_G",
463 [LQ_HT_SISO] = "HT SISO",
464 [LQ_HT_MIMO2] = "HT MIMO",
465 [LQ_VHT_SISO] = "VHT SISO",
466 [LQ_VHT_MIMO2] = "VHT MIMO",
467 [LQ_HE_SISO] = "HE SISO",
468 [LQ_HE_MIMO2] = "HE MIMO",
469 };
470
471 if (type < LQ_NONE || type >= LQ_MAX)
472 return "UNKNOWN";
473
474 return lq_types[type];
475}
476
477static char *rs_pretty_rate(const struct rs_rate *rate)
478{
479 static char buf[40];
480 static const char * const legacy_rates[] = {
481 [IWL_RATE_1M_INDEX] = "1M",
482 [IWL_RATE_2M_INDEX] = "2M",
483 [IWL_RATE_5M_INDEX] = "5.5M",
484 [IWL_RATE_11M_INDEX] = "11M",
485 [IWL_RATE_6M_INDEX] = "6M",
486 [IWL_RATE_9M_INDEX] = "9M",
487 [IWL_RATE_12M_INDEX] = "12M",
488 [IWL_RATE_18M_INDEX] = "18M",
489 [IWL_RATE_24M_INDEX] = "24M",
490 [IWL_RATE_36M_INDEX] = "36M",
491 [IWL_RATE_48M_INDEX] = "48M",
492 [IWL_RATE_54M_INDEX] = "54M",
493 };
494 static const char *const ht_vht_rates[] = {
495 [IWL_RATE_MCS_0_INDEX] = "MCS0",
496 [IWL_RATE_MCS_1_INDEX] = "MCS1",
497 [IWL_RATE_MCS_2_INDEX] = "MCS2",
498 [IWL_RATE_MCS_3_INDEX] = "MCS3",
499 [IWL_RATE_MCS_4_INDEX] = "MCS4",
500 [IWL_RATE_MCS_5_INDEX] = "MCS5",
501 [IWL_RATE_MCS_6_INDEX] = "MCS6",
502 [IWL_RATE_MCS_7_INDEX] = "MCS7",
503 [IWL_RATE_MCS_8_INDEX] = "MCS8",
504 [IWL_RATE_MCS_9_INDEX] = "MCS9",
505 };
506 const char *rate_str;
507
508 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
509 rate_str = legacy_rates[rate->index];
510 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
511 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
512 (rate->index <= IWL_RATE_MCS_9_INDEX))
513 rate_str = ht_vht_rates[rate->index];
514 else
515 rate_str = "BAD_RATE";
516
517 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
518 iwl_rs_pretty_ant(rate->ant), rate_str);
519 return buf;
520}
521
522static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
523 const char *prefix)
524{
525 IWL_DEBUG_RATE(mvm,
526 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
527 prefix, rs_pretty_rate(rate), rate->bw,
528 rate->sgi, rate->ldpc, rate->stbc);
529}
530
531static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
532{
533 window->data = 0;
534 window->success_counter = 0;
535 window->success_ratio = IWL_INVALID_VALUE;
536 window->counter = 0;
537 window->average_tpt = IWL_INVALID_VALUE;
538}
539
540static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
541 struct iwl_scale_tbl_info *tbl)
542{
543 int i;
544
545 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
546 for (i = 0; i < IWL_RATE_COUNT; i++)
547 rs_rate_scale_clear_window(&tbl->win[i]);
548
549 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
550 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
551}
552
553static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
554{
555 return (ant_type & valid_antenna) == ant_type;
556}
557
558static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
559 struct iwl_lq_sta *lq_data, u8 tid,
560 struct ieee80211_sta *sta)
561{
562 int ret;
563
564 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
565 sta->addr, tid);
566
567 /* start BA session until the peer sends del BA */
568 ret = ieee80211_start_tx_ba_session(sta, tid, 0);
569 if (ret == -EAGAIN) {
570 /*
571 * driver and mac80211 is out of sync
572 * this might be cause by reloading firmware
573 * stop the tx ba session here
574 */
575 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
576 tid);
577 ieee80211_stop_tx_ba_session(sta, tid);
578 }
579 return ret;
580}
581
582static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
583 u8 tid, struct iwl_lq_sta *lq_sta,
584 struct ieee80211_sta *sta)
585{
586 struct iwl_mvm_tid_data *tid_data;
587
588 /*
589 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
590 * when the frame is not QoS
591 */
592 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
593 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
594 tid, IWL_MAX_TID_COUNT);
595 return;
596 } else if (tid == IWL_MAX_TID_COUNT) {
597 return;
598 }
599
600 tid_data = &mvmsta->tid_data[tid];
601 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
602 tid_data->state == IWL_AGG_OFF &&
603 (lq_sta->tx_agg_tid_en & BIT(tid)) &&
604 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
605 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
606 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
607 tid_data->state = IWL_AGG_QUEUED;
608 }
609}
610
611static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
612{
613 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
614 !!(rate_n_flags & RATE_MCS_ANT_B_MSK);
615}
616
617/*
618 * Static function to get the expected throughput from an iwl_scale_tbl_info
619 * that wraps a NULL pointer check
620 */
621static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
622{
623 if (tbl->expected_tpt)
624 return tbl->expected_tpt[rs_index];
625 return 0;
626}
627
628/*
629 * rs_collect_tx_data - Update the success/failure sliding window
630 *
631 * We keep a sliding window of the last 62 packets transmitted
632 * at this rate. window->data contains the bitmask of successful
633 * packets.
634 */
635static int _rs_collect_tx_data(struct iwl_mvm *mvm,
636 struct iwl_scale_tbl_info *tbl,
637 int scale_index, int attempts, int successes,
638 struct iwl_rate_scale_data *window)
639{
640 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
641 s32 fail_count, tpt;
642
643 /* Get expected throughput */
644 tpt = get_expected_tpt(tbl, scale_index);
645
646 /*
647 * Keep track of only the latest 62 tx frame attempts in this rate's
648 * history window; anything older isn't really relevant any more.
649 * If we have filled up the sliding window, drop the oldest attempt;
650 * if the oldest attempt (highest bit in bitmap) shows "success",
651 * subtract "1" from the success counter (this is the main reason
652 * we keep these bitmaps!).
653 */
654 while (attempts > 0) {
655 if (window->counter >= IWL_RATE_MAX_WINDOW) {
656 /* remove earliest */
657 window->counter = IWL_RATE_MAX_WINDOW - 1;
658
659 if (window->data & mask) {
660 window->data &= ~mask;
661 window->success_counter--;
662 }
663 }
664
665 /* Increment frames-attempted counter */
666 window->counter++;
667
668 /* Shift bitmap by one frame to throw away oldest history */
669 window->data <<= 1;
670
671 /* Mark the most recent #successes attempts as successful */
672 if (successes > 0) {
673 window->success_counter++;
674 window->data |= 0x1;
675 successes--;
676 }
677
678 attempts--;
679 }
680
681 /* Calculate current success ratio, avoid divide-by-0! */
682 if (window->counter > 0)
683 window->success_ratio = 128 * (100 * window->success_counter)
684 / window->counter;
685 else
686 window->success_ratio = IWL_INVALID_VALUE;
687
688 fail_count = window->counter - window->success_counter;
689
690 /* Calculate average throughput, if we have enough history. */
691 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
692 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
693 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
694 else
695 window->average_tpt = IWL_INVALID_VALUE;
696
697 return 0;
698}
699
700static int rs_collect_tpc_data(struct iwl_mvm *mvm,
701 struct iwl_lq_sta *lq_sta,
702 struct iwl_scale_tbl_info *tbl,
703 int scale_index, int attempts, int successes,
704 u8 reduced_txp)
705{
706 struct iwl_rate_scale_data *window = NULL;
707
708 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
709 return -EINVAL;
710
711 window = &tbl->tpc_win[reduced_txp];
712 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
713 window);
714}
715
716static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
717 struct iwl_mvm_sta *mvmsta,
718 u8 tid, int successes)
719{
720 struct iwl_mvm_tid_data *tid_data;
721
722 if (tid >= IWL_MAX_TID_COUNT)
723 return;
724
725 tid_data = &mvmsta->tid_data[tid];
726
727 /*
728 * Measure if there're enough successful transmits per second.
729 * These statistics are used only to decide if we can start a
730 * BA session, so it should be updated only when A-MPDU is
731 * off.
732 */
733 if (tid_data->state != IWL_AGG_OFF)
734 return;
735
736 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
737 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
738 tid_data->tx_count_last = tid_data->tx_count;
739 tid_data->tx_count = 0;
740 tid_data->tpt_meas_start = jiffies;
741 } else {
742 tid_data->tx_count += successes;
743 }
744}
745
746static int rs_collect_tlc_data(struct iwl_mvm *mvm,
747 struct iwl_mvm_sta *mvmsta, u8 tid,
748 struct iwl_scale_tbl_info *tbl,
749 int scale_index, int attempts, int successes)
750{
751 struct iwl_rate_scale_data *window = NULL;
752
753 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
754 return -EINVAL;
755
756 if (tbl->column != RS_COLUMN_INVALID) {
757 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
758
759 pers->tx_stats[tbl->column][scale_index].total += attempts;
760 pers->tx_stats[tbl->column][scale_index].success += successes;
761 }
762
763 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
764
765 /* Select window for current tx bit rate */
766 window = &(tbl->win[scale_index]);
767 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
768 window);
769}
770
771/* Convert rs_rate object into ucode rate bitmask */
772static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
773 struct rs_rate *rate)
774{
775 u32 ucode_rate = 0;
776 int index = rate->index;
777
778 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
779 RATE_MCS_ANT_AB_MSK);
780
781 if (is_legacy(rate)) {
782 ucode_rate |= iwl_rates[index].plcp;
783 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
784 ucode_rate |= RATE_MCS_CCK_MSK_V1;
785 return ucode_rate;
786 }
787
788 /* set RTS protection for all non legacy rates
789 * This helps with congested environments reducing the conflict cost to
790 * RTS retries only, instead of the entire BA packet.
791 */
792 ucode_rate |= RATE_MCS_RTS_REQUIRED_MSK;
793
794 if (is_ht(rate)) {
795 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
796 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
797 index = IWL_LAST_HT_RATE;
798 }
799 ucode_rate |= RATE_MCS_HT_MSK_V1;
800
801 if (is_ht_siso(rate))
802 ucode_rate |= iwl_rates[index].plcp_ht_siso;
803 else if (is_ht_mimo2(rate))
804 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
805 else
806 WARN_ON_ONCE(1);
807 } else if (is_vht(rate)) {
808 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
809 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
810 index = IWL_LAST_VHT_RATE;
811 }
812 ucode_rate |= RATE_MCS_VHT_MSK_V1;
813 if (is_vht_siso(rate))
814 ucode_rate |= iwl_rates[index].plcp_vht_siso;
815 else if (is_vht_mimo2(rate))
816 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
817 else
818 WARN_ON_ONCE(1);
819
820 } else {
821 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
822 }
823
824 if (is_siso(rate) && rate->stbc) {
825 /* To enable STBC we need to set both a flag and ANT_AB */
826 ucode_rate |= RATE_MCS_ANT_AB_MSK;
827 ucode_rate |= RATE_MCS_STBC_MSK;
828 }
829
830 ucode_rate |= rate->bw;
831 if (rate->sgi)
832 ucode_rate |= RATE_MCS_SGI_MSK_V1;
833 if (rate->ldpc)
834 ucode_rate |= RATE_MCS_LDPC_MSK_V1;
835
836 return ucode_rate;
837}
838
839/* Convert a ucode rate into an rs_rate object */
840static int rs_rate_from_ucode_rate(const u32 ucode_rate,
841 enum nl80211_band band,
842 struct rs_rate *rate)
843{
844 u32 ant_msk = ucode_rate & RATE_MCS_ANT_AB_MSK;
845 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
846 u8 nss;
847
848 memset(rate, 0, sizeof(*rate));
849 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
850
851 if (rate->index == IWL_RATE_INVALID)
852 return -EINVAL;
853
854 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
855
856 /* Legacy */
857 if (!(ucode_rate & RATE_MCS_HT_MSK_V1) &&
858 !(ucode_rate & RATE_MCS_VHT_MSK_V1) &&
859 !(ucode_rate & RATE_MCS_HE_MSK_V1)) {
860 if (num_of_ant == 1) {
861 if (band == NL80211_BAND_5GHZ)
862 rate->type = LQ_LEGACY_A;
863 else
864 rate->type = LQ_LEGACY_G;
865 }
866
867 return 0;
868 }
869
870 /* HT, VHT or HE */
871 if (ucode_rate & RATE_MCS_SGI_MSK_V1)
872 rate->sgi = true;
873 if (ucode_rate & RATE_MCS_LDPC_MSK_V1)
874 rate->ldpc = true;
875 if (ucode_rate & RATE_MCS_STBC_MSK)
876 rate->stbc = true;
877 if (ucode_rate & RATE_MCS_BF_MSK)
878 rate->bfer = true;
879
880 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK_V1;
881
882 if (ucode_rate & RATE_MCS_HT_MSK_V1) {
883 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK_V1) >>
884 RATE_HT_MCS_NSS_POS_V1) + 1;
885
886 if (nss == 1) {
887 rate->type = LQ_HT_SISO;
888 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
889 "stbc %d bfer %d",
890 rate->stbc, rate->bfer);
891 } else if (nss == 2) {
892 rate->type = LQ_HT_MIMO2;
893 WARN_ON_ONCE(num_of_ant != 2);
894 } else {
895 WARN_ON_ONCE(1);
896 }
897 } else if (ucode_rate & RATE_MCS_VHT_MSK_V1) {
898 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
899 RATE_VHT_MCS_NSS_POS) + 1;
900
901 if (nss == 1) {
902 rate->type = LQ_VHT_SISO;
903 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
904 "stbc %d bfer %d",
905 rate->stbc, rate->bfer);
906 } else if (nss == 2) {
907 rate->type = LQ_VHT_MIMO2;
908 WARN_ON_ONCE(num_of_ant != 2);
909 } else {
910 WARN_ON_ONCE(1);
911 }
912 } else if (ucode_rate & RATE_MCS_HE_MSK_V1) {
913 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
914 RATE_VHT_MCS_NSS_POS) + 1;
915
916 if (nss == 1) {
917 rate->type = LQ_HE_SISO;
918 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
919 "stbc %d bfer %d", rate->stbc, rate->bfer);
920 } else if (nss == 2) {
921 rate->type = LQ_HE_MIMO2;
922 WARN_ON_ONCE(num_of_ant != 2);
923 } else {
924 WARN_ON_ONCE(1);
925 }
926 }
927
928 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
929 !is_he(rate) && !is_vht(rate));
930
931 return 0;
932}
933
934/* switch to another antenna/antennas and return 1 */
935/* if no other valid antenna found, return 0 */
936static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
937{
938 u8 new_ant_type;
939
940 if (!rs_is_valid_ant(valid_ant, rate->ant))
941 return 0;
942
943 new_ant_type = ant_toggle_lookup[rate->ant];
944
945 while ((new_ant_type != rate->ant) &&
946 !rs_is_valid_ant(valid_ant, new_ant_type))
947 new_ant_type = ant_toggle_lookup[new_ant_type];
948
949 if (new_ant_type == rate->ant)
950 return 0;
951
952 rate->ant = new_ant_type;
953
954 return 1;
955}
956
957static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
958 struct rs_rate *rate)
959{
960 if (is_legacy(rate))
961 return lq_sta->active_legacy_rate;
962 else if (is_siso(rate))
963 return lq_sta->active_siso_rate;
964 else if (is_mimo2(rate))
965 return lq_sta->active_mimo2_rate;
966
967 WARN_ON_ONCE(1);
968 return 0;
969}
970
971static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
972 int rate_type)
973{
974 u8 high = IWL_RATE_INVALID;
975 u8 low = IWL_RATE_INVALID;
976
977 /* 802.11A or ht walks to the next literal adjacent rate in
978 * the rate table */
979 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
980 int i;
981 u32 mask;
982
983 /* Find the previous rate that is in the rate mask */
984 i = index - 1;
985 if (i >= 0)
986 mask = BIT(i);
987 for (; i >= 0; i--, mask >>= 1) {
988 if (rate_mask & mask) {
989 low = i;
990 break;
991 }
992 }
993
994 /* Find the next rate that is in the rate mask */
995 i = index + 1;
996 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
997 if (rate_mask & mask) {
998 high = i;
999 break;
1000 }
1001 }
1002
1003 return (high << 8) | low;
1004 }
1005
1006 low = index;
1007 while (low != IWL_RATE_INVALID) {
1008 low = iwl_rates[low].prev_rs;
1009 if (low == IWL_RATE_INVALID)
1010 break;
1011 if (rate_mask & (1 << low))
1012 break;
1013 }
1014
1015 high = index;
1016 while (high != IWL_RATE_INVALID) {
1017 high = iwl_rates[high].next_rs;
1018 if (high == IWL_RATE_INVALID)
1019 break;
1020 if (rate_mask & (1 << high))
1021 break;
1022 }
1023
1024 return (high << 8) | low;
1025}
1026
1027static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1028 struct rs_rate *rate)
1029{
1030 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1031}
1032
1033/* Get the next supported lower rate in the current column.
1034 * Return true if bottom rate in the current column was reached
1035 */
1036static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1037 struct rs_rate *rate)
1038{
1039 u8 low;
1040 u16 high_low;
1041 u16 rate_mask;
1042 struct iwl_mvm *mvm = lq_sta->pers.drv;
1043
1044 rate_mask = rs_get_supported_rates(lq_sta, rate);
1045 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1046 rate->type);
1047 low = high_low & 0xff;
1048
1049 /* Bottom rate of column reached */
1050 if (low == IWL_RATE_INVALID)
1051 return true;
1052
1053 rate->index = low;
1054 return false;
1055}
1056
1057/* Get the next rate to use following a column downgrade */
1058static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1059 struct rs_rate *rate)
1060{
1061 struct iwl_mvm *mvm = lq_sta->pers.drv;
1062
1063 if (is_legacy(rate)) {
1064 /* No column to downgrade from Legacy */
1065 return;
1066 } else if (is_siso(rate)) {
1067 /* Downgrade to Legacy if we were in SISO */
1068 if (lq_sta->band == NL80211_BAND_5GHZ)
1069 rate->type = LQ_LEGACY_A;
1070 else
1071 rate->type = LQ_LEGACY_G;
1072
1073 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1074
1075 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1076 rate->index > IWL_RATE_MCS_9_INDEX);
1077
1078 rate->index = rs_ht_to_legacy[rate->index];
1079 rate->ldpc = false;
1080 } else {
1081 /* Downgrade to SISO with same MCS if in MIMO */
1082 rate->type = is_vht_mimo2(rate) ?
1083 LQ_VHT_SISO : LQ_HT_SISO;
1084 }
1085
1086 if (num_of_ant(rate->ant) > 1)
1087 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1088
1089 /* Relevant in both switching to SISO or Legacy */
1090 rate->sgi = false;
1091
1092 if (!rs_rate_supported(lq_sta, rate))
1093 rs_get_lower_rate_in_column(lq_sta, rate);
1094}
1095
1096/* Check if both rates share the same column */
1097static inline bool rs_rate_column_match(struct rs_rate *a,
1098 struct rs_rate *b)
1099{
1100 bool ant_match;
1101
1102 if (a->stbc || a->bfer)
1103 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1104 else
1105 ant_match = (a->ant == b->ant);
1106
1107 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1108 && ant_match;
1109}
1110
1111static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1112{
1113 if (is_legacy(rate)) {
1114 if (rate->ant == ANT_A)
1115 return RS_COLUMN_LEGACY_ANT_A;
1116
1117 if (rate->ant == ANT_B)
1118 return RS_COLUMN_LEGACY_ANT_B;
1119
1120 goto err;
1121 }
1122
1123 if (is_siso(rate)) {
1124 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1125 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1126 RS_COLUMN_SISO_ANT_A;
1127
1128 if (rate->ant == ANT_B)
1129 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1130 RS_COLUMN_SISO_ANT_B;
1131
1132 goto err;
1133 }
1134
1135 if (is_mimo(rate))
1136 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1137
1138err:
1139 return RS_COLUMN_INVALID;
1140}
1141
1142static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1143{
1144 u8 tid = IWL_MAX_TID_COUNT;
1145
1146 if (ieee80211_is_data_qos(hdr->frame_control)) {
1147 u8 *qc = ieee80211_get_qos_ctl(hdr);
1148 tid = qc[0] & 0xf;
1149 }
1150
1151 if (unlikely(tid > IWL_MAX_TID_COUNT))
1152 tid = IWL_MAX_TID_COUNT;
1153
1154 return tid;
1155}
1156
1157/*
1158 * mac80211 sends us Tx status
1159 */
1160static void rs_drv_mac80211_tx_status(void *mvm_r,
1161 struct ieee80211_supported_band *sband,
1162 struct ieee80211_sta *sta, void *priv_sta,
1163 struct sk_buff *skb)
1164{
1165 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1166 struct iwl_op_mode *op_mode = mvm_r;
1167 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1168 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1169 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1170
1171 if (!mvmsta->vif)
1172 return;
1173
1174 if (!ieee80211_is_data(hdr->frame_control) ||
1175 info->flags & IEEE80211_TX_CTL_NO_ACK)
1176 return;
1177
1178 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1179 ieee80211_is_qos_nullfunc(hdr->frame_control));
1180}
1181
1182/*
1183 * Begin a period of staying with a selected modulation mode.
1184 * Set "stay_in_tbl" flag to prevent any mode switches.
1185 * Set frame tx success limits according to legacy vs. high-throughput,
1186 * and reset overall (spanning all rates) tx success history statistics.
1187 * These control how long we stay using same modulation mode before
1188 * searching for a new mode.
1189 */
1190static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1191 struct iwl_lq_sta *lq_sta)
1192{
1193 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1194 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1195 if (is_legacy) {
1196 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1197 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1198 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1199 } else {
1200 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1201 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1202 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1203 }
1204 lq_sta->table_count = 0;
1205 lq_sta->total_failed = 0;
1206 lq_sta->total_success = 0;
1207 lq_sta->flush_timer = jiffies;
1208 lq_sta->visited_columns = 0;
1209}
1210
1211static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1212{
1213 if (rate_mask)
1214 return find_last_bit(&rate_mask, BITS_PER_LONG);
1215 return IWL_RATE_INVALID;
1216}
1217
1218static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1219 const struct rs_tx_column *column)
1220{
1221 switch (column->mode) {
1222 case RS_LEGACY:
1223 return lq_sta->max_legacy_rate_idx;
1224 case RS_SISO:
1225 return lq_sta->max_siso_rate_idx;
1226 case RS_MIMO2:
1227 return lq_sta->max_mimo2_rate_idx;
1228 default:
1229 WARN_ON_ONCE(1);
1230 }
1231
1232 return lq_sta->max_legacy_rate_idx;
1233}
1234
1235static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1236 const struct rs_tx_column *column,
1237 u32 bw)
1238{
1239 /* Used to choose among HT tables */
1240 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1241
1242 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1243 column->mode != RS_SISO &&
1244 column->mode != RS_MIMO2))
1245 return expected_tpt_legacy;
1246
1247 /* Legacy rates have only one table */
1248 if (column->mode == RS_LEGACY)
1249 return expected_tpt_legacy;
1250
1251 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1252 /* Choose among many HT tables depending on number of streams
1253 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1254 * status */
1255 if (column->mode == RS_SISO) {
1256 switch (bw) {
1257 case RATE_MCS_CHAN_WIDTH_20:
1258 ht_tbl_pointer = expected_tpt_siso_20MHz;
1259 break;
1260 case RATE_MCS_CHAN_WIDTH_40:
1261 ht_tbl_pointer = expected_tpt_siso_40MHz;
1262 break;
1263 case RATE_MCS_CHAN_WIDTH_80:
1264 ht_tbl_pointer = expected_tpt_siso_80MHz;
1265 break;
1266 case RATE_MCS_CHAN_WIDTH_160:
1267 ht_tbl_pointer = expected_tpt_siso_160MHz;
1268 break;
1269 default:
1270 WARN_ON_ONCE(1);
1271 }
1272 } else if (column->mode == RS_MIMO2) {
1273 switch (bw) {
1274 case RATE_MCS_CHAN_WIDTH_20:
1275 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1276 break;
1277 case RATE_MCS_CHAN_WIDTH_40:
1278 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1279 break;
1280 case RATE_MCS_CHAN_WIDTH_80:
1281 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1282 break;
1283 case RATE_MCS_CHAN_WIDTH_160:
1284 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1285 break;
1286 default:
1287 WARN_ON_ONCE(1);
1288 }
1289 } else {
1290 WARN_ON_ONCE(1);
1291 }
1292
1293 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1294 return ht_tbl_pointer[0];
1295 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1296 return ht_tbl_pointer[1];
1297 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1298 return ht_tbl_pointer[2];
1299 else /* AGG+SGI */
1300 return ht_tbl_pointer[3];
1301}
1302
1303static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1304 struct iwl_scale_tbl_info *tbl)
1305{
1306 struct rs_rate *rate = &tbl->rate;
1307 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1308
1309 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1310}
1311
1312/* rs uses two tables, one is active and the second is for searching better
1313 * configuration. This function, according to the index of the currently
1314 * active table returns the search table, which is located at the
1315 * index complementary to 1 according to the active table (active = 1,
1316 * search = 0 or active = 0, search = 1).
1317 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1318 */
1319static inline u8 rs_search_tbl(u8 active_tbl)
1320{
1321 return (active_tbl ^ 1) & 1;
1322}
1323
1324static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1325 struct iwl_lq_sta *lq_sta,
1326 struct iwl_scale_tbl_info *tbl, /* "search" */
1327 unsigned long rate_mask, s8 index)
1328{
1329 struct iwl_scale_tbl_info *active_tbl =
1330 &(lq_sta->lq_info[lq_sta->active_tbl]);
1331 s32 success_ratio = active_tbl->win[index].success_ratio;
1332 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1333 const u16 *tpt_tbl = tbl->expected_tpt;
1334 u16 high_low;
1335 u32 target_tpt;
1336 int rate_idx;
1337
1338 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1339 target_tpt = 100 * expected_current_tpt;
1340 IWL_DEBUG_RATE(mvm,
1341 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1342 success_ratio, target_tpt);
1343 } else {
1344 target_tpt = lq_sta->last_tpt;
1345 IWL_DEBUG_RATE(mvm,
1346 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1347 success_ratio, target_tpt);
1348 }
1349
1350 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1351
1352 while (rate_idx != IWL_RATE_INVALID) {
1353 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1354 break;
1355
1356 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1357 tbl->rate.type);
1358
1359 rate_idx = (high_low >> 8) & 0xff;
1360 }
1361
1362 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1363 rate_idx, target_tpt,
1364 rate_idx != IWL_RATE_INVALID ?
1365 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1366
1367 return rate_idx;
1368}
1369
1370static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1371{
1372 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->deflink.vht_cap;
1373 struct ieee80211_vht_cap vht_cap = {
1374 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1375 .supp_mcs = sta_vht_cap->vht_mcs,
1376 };
1377
1378 switch (sta->deflink.bandwidth) {
1379 case IEEE80211_STA_RX_BW_160:
1380 /*
1381 * Don't use 160 MHz if VHT extended NSS support
1382 * says we cannot use 2 streams, we don't want to
1383 * deal with this.
1384 * We only check MCS 0 - they will support that if
1385 * we got here at all and we don't care which MCS,
1386 * we want to determine a more global state.
1387 */
1388 if (ieee80211_get_vht_max_nss(&vht_cap,
1389 IEEE80211_VHT_CHANWIDTH_160MHZ,
1390 0, true,
1391 sta->deflink.rx_nss) < sta->deflink.rx_nss)
1392 return RATE_MCS_CHAN_WIDTH_80;
1393 return RATE_MCS_CHAN_WIDTH_160;
1394 case IEEE80211_STA_RX_BW_80:
1395 return RATE_MCS_CHAN_WIDTH_80;
1396 case IEEE80211_STA_RX_BW_40:
1397 return RATE_MCS_CHAN_WIDTH_40;
1398 case IEEE80211_STA_RX_BW_20:
1399 default:
1400 return RATE_MCS_CHAN_WIDTH_20;
1401 }
1402}
1403
1404/*
1405 * Check whether we should continue using same modulation mode, or
1406 * begin search for a new mode, based on:
1407 * 1) # tx successes or failures while using this mode
1408 * 2) # times calling this function
1409 * 3) elapsed time in this mode (not used, for now)
1410 */
1411static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1412{
1413 struct iwl_scale_tbl_info *tbl;
1414 int active_tbl;
1415 int flush_interval_passed = 0;
1416 struct iwl_mvm *mvm;
1417
1418 mvm = lq_sta->pers.drv;
1419 active_tbl = lq_sta->active_tbl;
1420
1421 tbl = &(lq_sta->lq_info[active_tbl]);
1422
1423 /* If we've been disallowing search, see if we should now allow it */
1424 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1425 /* Elapsed time using current modulation mode */
1426 if (lq_sta->flush_timer)
1427 flush_interval_passed =
1428 time_after(jiffies,
1429 (unsigned long)(lq_sta->flush_timer +
1430 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1431
1432 /*
1433 * Check if we should allow search for new modulation mode.
1434 * If many frames have failed or succeeded, or we've used
1435 * this same modulation for a long time, allow search, and
1436 * reset history stats that keep track of whether we should
1437 * allow a new search. Also (below) reset all bitmaps and
1438 * stats in active history.
1439 */
1440 if (force_search ||
1441 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1442 (lq_sta->total_success > lq_sta->max_success_limit) ||
1443 ((!lq_sta->search_better_tbl) &&
1444 (lq_sta->flush_timer) && (flush_interval_passed))) {
1445 IWL_DEBUG_RATE(mvm,
1446 "LQ: stay is expired %d %d %d\n",
1447 lq_sta->total_failed,
1448 lq_sta->total_success,
1449 flush_interval_passed);
1450
1451 /* Allow search for new mode */
1452 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1453 IWL_DEBUG_RATE(mvm,
1454 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1455 lq_sta->total_failed = 0;
1456 lq_sta->total_success = 0;
1457 lq_sta->flush_timer = 0;
1458 /* mark the current column as visited */
1459 lq_sta->visited_columns = BIT(tbl->column);
1460 /*
1461 * Else if we've used this modulation mode enough repetitions
1462 * (regardless of elapsed time or success/failure), reset
1463 * history bitmaps and rate-specific stats for all rates in
1464 * active table.
1465 */
1466 } else {
1467 lq_sta->table_count++;
1468 if (lq_sta->table_count >=
1469 lq_sta->table_count_limit) {
1470 lq_sta->table_count = 0;
1471
1472 IWL_DEBUG_RATE(mvm,
1473 "LQ: stay in table clear win\n");
1474 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1475 }
1476 }
1477
1478 /* If transitioning to allow "search", reset all history
1479 * bitmaps and stats in active table (this will become the new
1480 * "search" table). */
1481 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1482 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1483 }
1484 }
1485}
1486
1487static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1488 struct iwl_scale_tbl_info *tbl,
1489 enum rs_action scale_action)
1490{
1491 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1492 int i;
1493
1494 sta->deflink.agg.max_amsdu_len = rs_fw_get_max_amsdu_len(sta);
1495
1496 /*
1497 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1498 * or 0, since there is no per-TID alg.
1499 */
1500 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1501 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1502 scale_action == RS_ACTION_DOWNSCALE)
1503 mvmsta->amsdu_enabled = 0;
1504 else
1505 mvmsta->amsdu_enabled = 0xFFFF;
1506
1507 if (mvmsta->vif->bss_conf.he_support &&
1508 !iwlwifi_mod_params.disable_11ax)
1509 mvmsta->max_amsdu_len = sta->deflink.agg.max_amsdu_len;
1510 else
1511 mvmsta->max_amsdu_len =
1512 min_t(int, sta->deflink.agg.max_amsdu_len, 8500);
1513
1514 sta->deflink.agg.max_rc_amsdu_len = mvmsta->max_amsdu_len;
1515
1516 for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1517 if (mvmsta->amsdu_enabled)
1518 sta->deflink.agg.max_tid_amsdu_len[i] =
1519 iwl_mvm_max_amsdu_size(mvm, sta, i);
1520 else
1521 /*
1522 * Not so elegant, but this will effectively
1523 * prevent AMSDU on this TID
1524 */
1525 sta->deflink.agg.max_tid_amsdu_len[i] = 1;
1526 }
1527}
1528
1529/*
1530 * setup rate table in uCode
1531 */
1532static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1533 struct ieee80211_sta *sta,
1534 struct iwl_lq_sta *lq_sta,
1535 struct iwl_scale_tbl_info *tbl)
1536{
1537 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1538 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1539}
1540
1541static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1542 struct ieee80211_sta *sta,
1543 struct iwl_lq_sta *lq_sta,
1544 struct iwl_scale_tbl_info *tbl,
1545 enum rs_action scale_action)
1546{
1547 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1548 return false;
1549
1550 if (!is_vht_siso(&tbl->rate))
1551 return false;
1552
1553 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1554 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1555 (scale_action == RS_ACTION_DOWNSCALE)) {
1556 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1557 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1558 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1559 goto tweaked;
1560 }
1561
1562 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1563 * sustainable, i.e. we're past the test window. We can't go back
1564 * if MCS5 is just tested as this will happen always after switching
1565 * to 20Mhz MCS4 because the rate stats are cleared.
1566 */
1567 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1568 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1569 (scale_action == RS_ACTION_STAY)) ||
1570 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1571 (scale_action == RS_ACTION_UPSCALE)))) {
1572 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1573 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1574 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1575 goto tweaked;
1576 }
1577
1578 return false;
1579
1580tweaked:
1581 rs_set_expected_tpt_table(lq_sta, tbl);
1582 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1583 return true;
1584}
1585
1586static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1587 struct iwl_lq_sta *lq_sta,
1588 struct ieee80211_sta *sta,
1589 struct iwl_scale_tbl_info *tbl)
1590{
1591 int i, j, max_rate;
1592 enum rs_column next_col_id;
1593 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1594 const struct rs_tx_column *next_col;
1595 allow_column_func_t allow_func;
1596 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1597 const u16 *expected_tpt_tbl;
1598 u16 tpt, max_expected_tpt;
1599
1600 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1601 next_col_id = curr_col->next_columns[i];
1602
1603 if (next_col_id == RS_COLUMN_INVALID)
1604 continue;
1605
1606 if (lq_sta->visited_columns & BIT(next_col_id)) {
1607 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1608 next_col_id);
1609 continue;
1610 }
1611
1612 next_col = &rs_tx_columns[next_col_id];
1613
1614 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1615 IWL_DEBUG_RATE(mvm,
1616 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1617 next_col_id, valid_ants, next_col->ant);
1618 continue;
1619 }
1620
1621 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1622 allow_func = next_col->checks[j];
1623 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1624 next_col))
1625 break;
1626 }
1627
1628 if (j != MAX_COLUMN_CHECKS) {
1629 IWL_DEBUG_RATE(mvm,
1630 "Skip column %d: not allowed (check %d failed)\n",
1631 next_col_id, j);
1632
1633 continue;
1634 }
1635
1636 tpt = lq_sta->last_tpt / 100;
1637 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1638 rs_bw_from_sta_bw(sta));
1639 if (WARN_ON_ONCE(!expected_tpt_tbl))
1640 continue;
1641
1642 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1643 if (max_rate == IWL_RATE_INVALID) {
1644 IWL_DEBUG_RATE(mvm,
1645 "Skip column %d: no rate is allowed in this column\n",
1646 next_col_id);
1647 continue;
1648 }
1649
1650 max_expected_tpt = expected_tpt_tbl[max_rate];
1651 if (tpt >= max_expected_tpt) {
1652 IWL_DEBUG_RATE(mvm,
1653 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1654 next_col_id, max_expected_tpt, tpt);
1655 continue;
1656 }
1657
1658 IWL_DEBUG_RATE(mvm,
1659 "Found potential column %d. Max expected %d current %d\n",
1660 next_col_id, max_expected_tpt, tpt);
1661 break;
1662 }
1663
1664 if (i == MAX_NEXT_COLUMNS)
1665 return RS_COLUMN_INVALID;
1666
1667 return next_col_id;
1668}
1669
1670static int rs_switch_to_column(struct iwl_mvm *mvm,
1671 struct iwl_lq_sta *lq_sta,
1672 struct ieee80211_sta *sta,
1673 enum rs_column col_id)
1674{
1675 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1676 struct iwl_scale_tbl_info *search_tbl =
1677 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1678 struct rs_rate *rate = &search_tbl->rate;
1679 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1680 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1681 unsigned long rate_mask = 0;
1682 u32 rate_idx = 0;
1683
1684 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1685
1686 rate->sgi = column->sgi;
1687 rate->ant = column->ant;
1688
1689 if (column->mode == RS_LEGACY) {
1690 if (lq_sta->band == NL80211_BAND_5GHZ)
1691 rate->type = LQ_LEGACY_A;
1692 else
1693 rate->type = LQ_LEGACY_G;
1694
1695 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1696 rate->ldpc = false;
1697 rate_mask = lq_sta->active_legacy_rate;
1698 } else if (column->mode == RS_SISO) {
1699 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1700 rate_mask = lq_sta->active_siso_rate;
1701 } else if (column->mode == RS_MIMO2) {
1702 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1703 rate_mask = lq_sta->active_mimo2_rate;
1704 } else {
1705 WARN_ONCE(1, "Bad column mode");
1706 }
1707
1708 if (column->mode != RS_LEGACY) {
1709 rate->bw = rs_bw_from_sta_bw(sta);
1710 rate->ldpc = lq_sta->ldpc;
1711 }
1712
1713 search_tbl->column = col_id;
1714 rs_set_expected_tpt_table(lq_sta, search_tbl);
1715
1716 lq_sta->visited_columns |= BIT(col_id);
1717
1718 /* Get the best matching rate if we're changing modes. e.g.
1719 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1720 */
1721 if (curr_column->mode != column->mode) {
1722 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1723 rate_mask, rate->index);
1724
1725 if ((rate_idx == IWL_RATE_INVALID) ||
1726 !(BIT(rate_idx) & rate_mask)) {
1727 IWL_DEBUG_RATE(mvm,
1728 "can not switch with index %d"
1729 " rate mask %lx\n",
1730 rate_idx, rate_mask);
1731
1732 goto err;
1733 }
1734
1735 rate->index = rate_idx;
1736 }
1737
1738 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1739 col_id, rate->index);
1740
1741 return 0;
1742
1743err:
1744 rate->type = LQ_NONE;
1745 return -1;
1746}
1747
1748static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1749 struct iwl_scale_tbl_info *tbl,
1750 s32 sr, int low, int high,
1751 int current_tpt,
1752 int low_tpt, int high_tpt)
1753{
1754 enum rs_action action = RS_ACTION_STAY;
1755
1756 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1757 (current_tpt == 0)) {
1758 IWL_DEBUG_RATE(mvm,
1759 "Decrease rate because of low SR\n");
1760 return RS_ACTION_DOWNSCALE;
1761 }
1762
1763 if ((low_tpt == IWL_INVALID_VALUE) &&
1764 (high_tpt == IWL_INVALID_VALUE) &&
1765 (high != IWL_RATE_INVALID)) {
1766 IWL_DEBUG_RATE(mvm,
1767 "No data about high/low rates. Increase rate\n");
1768 return RS_ACTION_UPSCALE;
1769 }
1770
1771 if ((high_tpt == IWL_INVALID_VALUE) &&
1772 (high != IWL_RATE_INVALID) &&
1773 (low_tpt != IWL_INVALID_VALUE) &&
1774 (low_tpt < current_tpt)) {
1775 IWL_DEBUG_RATE(mvm,
1776 "No data about high rate and low rate is worse. Increase rate\n");
1777 return RS_ACTION_UPSCALE;
1778 }
1779
1780 if ((high_tpt != IWL_INVALID_VALUE) &&
1781 (high_tpt > current_tpt)) {
1782 IWL_DEBUG_RATE(mvm,
1783 "Higher rate is better. Increate rate\n");
1784 return RS_ACTION_UPSCALE;
1785 }
1786
1787 if ((low_tpt != IWL_INVALID_VALUE) &&
1788 (high_tpt != IWL_INVALID_VALUE) &&
1789 (low_tpt < current_tpt) &&
1790 (high_tpt < current_tpt)) {
1791 IWL_DEBUG_RATE(mvm,
1792 "Both high and low are worse. Maintain rate\n");
1793 return RS_ACTION_STAY;
1794 }
1795
1796 if ((low_tpt != IWL_INVALID_VALUE) &&
1797 (low_tpt > current_tpt)) {
1798 IWL_DEBUG_RATE(mvm,
1799 "Lower rate is better\n");
1800 action = RS_ACTION_DOWNSCALE;
1801 goto out;
1802 }
1803
1804 if ((low_tpt == IWL_INVALID_VALUE) &&
1805 (low != IWL_RATE_INVALID)) {
1806 IWL_DEBUG_RATE(mvm,
1807 "No data about lower rate\n");
1808 action = RS_ACTION_DOWNSCALE;
1809 goto out;
1810 }
1811
1812 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1813
1814out:
1815 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1816 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1817 IWL_DEBUG_RATE(mvm,
1818 "SR is above NO DECREASE. Avoid downscale\n");
1819 action = RS_ACTION_STAY;
1820 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1821 IWL_DEBUG_RATE(mvm,
1822 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1823 action = RS_ACTION_STAY;
1824 } else {
1825 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1826 }
1827 }
1828
1829 return action;
1830}
1831
1832static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1833 struct iwl_lq_sta *lq_sta)
1834{
1835 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1836 * supports STBC of at least 1*SS
1837 */
1838 if (!lq_sta->stbc_capable)
1839 return false;
1840
1841 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1842 return false;
1843
1844 return true;
1845}
1846
1847static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1848 int *weaker, int *stronger)
1849{
1850 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1851 if (*weaker > TPC_MAX_REDUCTION)
1852 *weaker = TPC_INVALID;
1853
1854 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1855 if (*stronger < 0)
1856 *stronger = TPC_INVALID;
1857}
1858
1859static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1860 struct rs_rate *rate, enum nl80211_band band)
1861{
1862 int index = rate->index;
1863 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1864 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1865 !vif->cfg.ps);
1866
1867 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1868 cam, sta_ps_disabled);
1869 /*
1870 * allow tpc only if power management is enabled, or bt coex
1871 * activity grade allows it and we are on 2.4Ghz.
1872 */
1873 if ((cam || sta_ps_disabled) &&
1874 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1875 return false;
1876
1877 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1878 if (is_legacy(rate))
1879 return index == IWL_RATE_54M_INDEX;
1880 if (is_ht(rate))
1881 return index == IWL_RATE_MCS_7_INDEX;
1882 if (is_vht(rate))
1883 return index == IWL_RATE_MCS_9_INDEX;
1884
1885 WARN_ON_ONCE(1);
1886 return false;
1887}
1888
1889enum tpc_action {
1890 TPC_ACTION_STAY,
1891 TPC_ACTION_DECREASE,
1892 TPC_ACTION_INCREASE,
1893 TPC_ACTION_NO_RESTIRCTION,
1894};
1895
1896static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1897 s32 sr, int weak, int strong,
1898 int current_tpt,
1899 int weak_tpt, int strong_tpt)
1900{
1901 /* stay until we have valid tpt */
1902 if (current_tpt == IWL_INVALID_VALUE) {
1903 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1904 return TPC_ACTION_STAY;
1905 }
1906
1907 /* Too many failures, increase txp */
1908 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1909 current_tpt == 0) {
1910 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1911 return TPC_ACTION_NO_RESTIRCTION;
1912 }
1913
1914 /* try decreasing first if applicable */
1915 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1916 weak != TPC_INVALID) {
1917 if (weak_tpt == IWL_INVALID_VALUE &&
1918 (strong_tpt == IWL_INVALID_VALUE ||
1919 current_tpt >= strong_tpt)) {
1920 IWL_DEBUG_RATE(mvm,
1921 "no weak txp measurement. decrease txp\n");
1922 return TPC_ACTION_DECREASE;
1923 }
1924
1925 if (weak_tpt > current_tpt) {
1926 IWL_DEBUG_RATE(mvm,
1927 "lower txp has better tpt. decrease txp\n");
1928 return TPC_ACTION_DECREASE;
1929 }
1930 }
1931
1932 /* next, increase if needed */
1933 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1934 strong != TPC_INVALID) {
1935 if (weak_tpt == IWL_INVALID_VALUE &&
1936 strong_tpt != IWL_INVALID_VALUE &&
1937 current_tpt < strong_tpt) {
1938 IWL_DEBUG_RATE(mvm,
1939 "higher txp has better tpt. increase txp\n");
1940 return TPC_ACTION_INCREASE;
1941 }
1942
1943 if (weak_tpt < current_tpt &&
1944 (strong_tpt == IWL_INVALID_VALUE ||
1945 strong_tpt > current_tpt)) {
1946 IWL_DEBUG_RATE(mvm,
1947 "lower txp has worse tpt. increase txp\n");
1948 return TPC_ACTION_INCREASE;
1949 }
1950 }
1951
1952 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1953 return TPC_ACTION_STAY;
1954}
1955
1956static bool rs_tpc_perform(struct iwl_mvm *mvm,
1957 struct ieee80211_sta *sta,
1958 struct iwl_lq_sta *lq_sta,
1959 struct iwl_scale_tbl_info *tbl)
1960{
1961 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1962 struct ieee80211_vif *vif = mvm_sta->vif;
1963 struct ieee80211_chanctx_conf *chanctx_conf;
1964 enum nl80211_band band;
1965 struct iwl_rate_scale_data *window;
1966 struct rs_rate *rate = &tbl->rate;
1967 enum tpc_action action;
1968 s32 sr;
1969 u8 cur = lq_sta->lq.reduced_tpc;
1970 int current_tpt;
1971 int weak, strong;
1972 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1973
1974#ifdef CONFIG_MAC80211_DEBUGFS
1975 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1976 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1977 lq_sta->pers.dbg_fixed_txp_reduction);
1978 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1979 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1980 }
1981#endif
1982
1983 rcu_read_lock();
1984 chanctx_conf = rcu_dereference(vif->bss_conf.chanctx_conf);
1985 if (WARN_ON(!chanctx_conf))
1986 band = NUM_NL80211_BANDS;
1987 else
1988 band = chanctx_conf->def.chan->band;
1989 rcu_read_unlock();
1990
1991 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1992 IWL_DEBUG_RATE(mvm,
1993 "tpc is not allowed. remove txp restrictions\n");
1994 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1995 return cur != TPC_NO_REDUCTION;
1996 }
1997
1998 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1999
2000 /* Collect measured throughputs for current and adjacent rates */
2001 window = tbl->tpc_win;
2002 sr = window[cur].success_ratio;
2003 current_tpt = window[cur].average_tpt;
2004 if (weak != TPC_INVALID)
2005 weak_tpt = window[weak].average_tpt;
2006 if (strong != TPC_INVALID)
2007 strong_tpt = window[strong].average_tpt;
2008
2009 IWL_DEBUG_RATE(mvm,
2010 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2011 cur, current_tpt, sr, weak, strong,
2012 weak_tpt, strong_tpt);
2013
2014 action = rs_get_tpc_action(mvm, sr, weak, strong,
2015 current_tpt, weak_tpt, strong_tpt);
2016
2017 /* override actions if we are on the edge */
2018 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2019 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2020 action = TPC_ACTION_STAY;
2021 } else if (strong == TPC_INVALID &&
2022 (action == TPC_ACTION_INCREASE ||
2023 action == TPC_ACTION_NO_RESTIRCTION)) {
2024 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2025 action = TPC_ACTION_STAY;
2026 }
2027
2028 switch (action) {
2029 case TPC_ACTION_DECREASE:
2030 lq_sta->lq.reduced_tpc = weak;
2031 return true;
2032 case TPC_ACTION_INCREASE:
2033 lq_sta->lq.reduced_tpc = strong;
2034 return true;
2035 case TPC_ACTION_NO_RESTIRCTION:
2036 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2037 return true;
2038 case TPC_ACTION_STAY:
2039 /* do nothing */
2040 break;
2041 }
2042 return false;
2043}
2044
2045/*
2046 * Do rate scaling and search for new modulation mode.
2047 */
2048static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2049 struct ieee80211_sta *sta,
2050 struct iwl_lq_sta *lq_sta,
2051 int tid, bool ndp)
2052{
2053 int low = IWL_RATE_INVALID;
2054 int high = IWL_RATE_INVALID;
2055 int index;
2056 struct iwl_rate_scale_data *window = NULL;
2057 int current_tpt = IWL_INVALID_VALUE;
2058 int low_tpt = IWL_INVALID_VALUE;
2059 int high_tpt = IWL_INVALID_VALUE;
2060 u32 fail_count;
2061 enum rs_action scale_action = RS_ACTION_STAY;
2062 u16 rate_mask;
2063 u8 update_lq = 0;
2064 struct iwl_scale_tbl_info *tbl, *tbl1;
2065 u8 active_tbl = 0;
2066 u8 done_search = 0;
2067 u16 high_low;
2068 s32 sr;
2069 u8 prev_agg = lq_sta->is_agg;
2070 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2071 struct rs_rate *rate;
2072
2073 lq_sta->is_agg = !!mvmsta->agg_tids;
2074
2075 /*
2076 * Select rate-scale / modulation-mode table to work with in
2077 * the rest of this function: "search" if searching for better
2078 * modulation mode, or "active" if doing rate scaling within a mode.
2079 */
2080 if (!lq_sta->search_better_tbl)
2081 active_tbl = lq_sta->active_tbl;
2082 else
2083 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2084
2085 tbl = &(lq_sta->lq_info[active_tbl]);
2086 rate = &tbl->rate;
2087
2088 if (prev_agg != lq_sta->is_agg) {
2089 IWL_DEBUG_RATE(mvm,
2090 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2091 prev_agg, lq_sta->is_agg);
2092 rs_set_expected_tpt_table(lq_sta, tbl);
2093 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2094 }
2095
2096 /* current tx rate */
2097 index = rate->index;
2098
2099 /* rates available for this association, and for modulation mode */
2100 rate_mask = rs_get_supported_rates(lq_sta, rate);
2101
2102 if (!(BIT(index) & rate_mask)) {
2103 IWL_ERR(mvm, "Current Rate is not valid\n");
2104 if (lq_sta->search_better_tbl) {
2105 /* revert to active table if search table is not valid*/
2106 rate->type = LQ_NONE;
2107 lq_sta->search_better_tbl = 0;
2108 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2109 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2110 }
2111 return;
2112 }
2113
2114 /* Get expected throughput table and history window for current rate */
2115 if (!tbl->expected_tpt) {
2116 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2117 return;
2118 }
2119
2120 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2121 window = &(tbl->win[index]);
2122
2123 /*
2124 * If there is not enough history to calculate actual average
2125 * throughput, keep analyzing results of more tx frames, without
2126 * changing rate or mode (bypass most of the rest of this function).
2127 * Set up new rate table in uCode only if old rate is not supported
2128 * in current association (use new rate found above).
2129 */
2130 fail_count = window->counter - window->success_counter;
2131 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2132 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2133 IWL_DEBUG_RATE(mvm,
2134 "%s: Test Window: succ %d total %d\n",
2135 rs_pretty_rate(rate),
2136 window->success_counter, window->counter);
2137
2138 /* Can't calculate this yet; not enough history */
2139 window->average_tpt = IWL_INVALID_VALUE;
2140
2141 /* Should we stay with this modulation mode,
2142 * or search for a new one? */
2143 rs_stay_in_table(lq_sta, false);
2144
2145 return;
2146 }
2147
2148 /* If we are searching for better modulation mode, check success. */
2149 if (lq_sta->search_better_tbl) {
2150 /* If good success, continue using the "search" mode;
2151 * no need to send new link quality command, since we're
2152 * continuing to use the setup that we've been trying. */
2153 if (window->average_tpt > lq_sta->last_tpt) {
2154 IWL_DEBUG_RATE(mvm,
2155 "SWITCHING TO NEW TABLE SR: %d "
2156 "cur-tpt %d old-tpt %d\n",
2157 window->success_ratio,
2158 window->average_tpt,
2159 lq_sta->last_tpt);
2160
2161 /* Swap tables; "search" becomes "active" */
2162 lq_sta->active_tbl = active_tbl;
2163 current_tpt = window->average_tpt;
2164 /* Else poor success; go back to mode in "active" table */
2165 } else {
2166 IWL_DEBUG_RATE(mvm,
2167 "GOING BACK TO THE OLD TABLE: SR %d "
2168 "cur-tpt %d old-tpt %d\n",
2169 window->success_ratio,
2170 window->average_tpt,
2171 lq_sta->last_tpt);
2172
2173 /* Nullify "search" table */
2174 rate->type = LQ_NONE;
2175
2176 /* Revert to "active" table */
2177 active_tbl = lq_sta->active_tbl;
2178 tbl = &(lq_sta->lq_info[active_tbl]);
2179
2180 /* Revert to "active" rate and throughput info */
2181 index = tbl->rate.index;
2182 current_tpt = lq_sta->last_tpt;
2183
2184 /* Need to set up a new rate table in uCode */
2185 update_lq = 1;
2186 }
2187
2188 /* Either way, we've made a decision; modulation mode
2189 * search is done, allow rate adjustment next time. */
2190 lq_sta->search_better_tbl = 0;
2191 done_search = 1; /* Don't switch modes below! */
2192 goto lq_update;
2193 }
2194
2195 /* (Else) not in search of better modulation mode, try for better
2196 * starting rate, while staying in this mode. */
2197 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2198 low = high_low & 0xff;
2199 high = (high_low >> 8) & 0xff;
2200
2201 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2202
2203 sr = window->success_ratio;
2204
2205 /* Collect measured throughputs for current and adjacent rates */
2206 current_tpt = window->average_tpt;
2207 if (low != IWL_RATE_INVALID)
2208 low_tpt = tbl->win[low].average_tpt;
2209 if (high != IWL_RATE_INVALID)
2210 high_tpt = tbl->win[high].average_tpt;
2211
2212 IWL_DEBUG_RATE(mvm,
2213 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2214 rs_pretty_rate(rate), current_tpt, sr,
2215 low, high, low_tpt, high_tpt);
2216
2217 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2218 current_tpt, low_tpt, high_tpt);
2219
2220 /* Force a search in case BT doesn't like us being in MIMO */
2221 if (is_mimo(rate) &&
2222 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2223 IWL_DEBUG_RATE(mvm,
2224 "BT Coex forbids MIMO. Search for new config\n");
2225 rs_stay_in_table(lq_sta, true);
2226 goto lq_update;
2227 }
2228
2229 switch (scale_action) {
2230 case RS_ACTION_DOWNSCALE:
2231 /* Decrease starting rate, update uCode's rate table */
2232 if (low != IWL_RATE_INVALID) {
2233 update_lq = 1;
2234 index = low;
2235 } else {
2236 IWL_DEBUG_RATE(mvm,
2237 "At the bottom rate. Can't decrease\n");
2238 }
2239
2240 break;
2241 case RS_ACTION_UPSCALE:
2242 /* Increase starting rate, update uCode's rate table */
2243 if (high != IWL_RATE_INVALID) {
2244 update_lq = 1;
2245 index = high;
2246 } else {
2247 IWL_DEBUG_RATE(mvm,
2248 "At the top rate. Can't increase\n");
2249 }
2250
2251 break;
2252 case RS_ACTION_STAY:
2253 /* No change */
2254 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2255 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2256 break;
2257 default:
2258 break;
2259 }
2260
2261lq_update:
2262 /* Replace uCode's rate table for the destination station. */
2263 if (update_lq) {
2264 tbl->rate.index = index;
2265 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2266 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2267 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2268 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2269 }
2270
2271 rs_stay_in_table(lq_sta, false);
2272
2273 /*
2274 * Search for new modulation mode if we're:
2275 * 1) Not changing rates right now
2276 * 2) Not just finishing up a search
2277 * 3) Allowing a new search
2278 */
2279 if (!update_lq && !done_search &&
2280 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2281 && window->counter) {
2282 enum rs_column next_column;
2283
2284 /* Save current throughput to compare with "search" throughput*/
2285 lq_sta->last_tpt = current_tpt;
2286
2287 IWL_DEBUG_RATE(mvm,
2288 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2289 update_lq, done_search, lq_sta->rs_state,
2290 window->counter);
2291
2292 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2293 if (next_column != RS_COLUMN_INVALID) {
2294 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2295 next_column);
2296 if (!ret)
2297 lq_sta->search_better_tbl = 1;
2298 } else {
2299 IWL_DEBUG_RATE(mvm,
2300 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2301 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2302 }
2303
2304 /* If new "search" mode was selected, set up in uCode table */
2305 if (lq_sta->search_better_tbl) {
2306 /* Access the "search" table, clear its history. */
2307 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2308 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2309
2310 /* Use new "search" start rate */
2311 index = tbl->rate.index;
2312
2313 rs_dump_rate(mvm, &tbl->rate,
2314 "Switch to SEARCH TABLE:");
2315 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2316 } else {
2317 done_search = 1;
2318 }
2319 }
2320
2321 if (!ndp)
2322 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2323
2324 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2325 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2326 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2327 }
2328}
2329
2330struct rs_init_rate_info {
2331 s8 rssi;
2332 u8 rate_idx;
2333};
2334
2335static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2336 { -60, IWL_RATE_54M_INDEX },
2337 { -64, IWL_RATE_48M_INDEX },
2338 { -68, IWL_RATE_36M_INDEX },
2339 { -80, IWL_RATE_24M_INDEX },
2340 { -84, IWL_RATE_18M_INDEX },
2341 { -85, IWL_RATE_12M_INDEX },
2342 { -86, IWL_RATE_11M_INDEX },
2343 { -88, IWL_RATE_5M_INDEX },
2344 { -90, IWL_RATE_2M_INDEX },
2345 { S8_MIN, IWL_RATE_1M_INDEX },
2346};
2347
2348static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2349 { -60, IWL_RATE_54M_INDEX },
2350 { -64, IWL_RATE_48M_INDEX },
2351 { -72, IWL_RATE_36M_INDEX },
2352 { -80, IWL_RATE_24M_INDEX },
2353 { -84, IWL_RATE_18M_INDEX },
2354 { -85, IWL_RATE_12M_INDEX },
2355 { -87, IWL_RATE_9M_INDEX },
2356 { S8_MIN, IWL_RATE_6M_INDEX },
2357};
2358
2359static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2360 { -60, IWL_RATE_MCS_7_INDEX },
2361 { -64, IWL_RATE_MCS_6_INDEX },
2362 { -68, IWL_RATE_MCS_5_INDEX },
2363 { -72, IWL_RATE_MCS_4_INDEX },
2364 { -80, IWL_RATE_MCS_3_INDEX },
2365 { -84, IWL_RATE_MCS_2_INDEX },
2366 { -85, IWL_RATE_MCS_1_INDEX },
2367 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2368};
2369
2370/* MCS index 9 is not valid for 20MHz VHT channel width,
2371 * but is ok for 40, 80 and 160MHz channels.
2372 */
2373static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2374 { -60, IWL_RATE_MCS_8_INDEX },
2375 { -64, IWL_RATE_MCS_7_INDEX },
2376 { -68, IWL_RATE_MCS_6_INDEX },
2377 { -72, IWL_RATE_MCS_5_INDEX },
2378 { -80, IWL_RATE_MCS_4_INDEX },
2379 { -84, IWL_RATE_MCS_3_INDEX },
2380 { -85, IWL_RATE_MCS_2_INDEX },
2381 { -87, IWL_RATE_MCS_1_INDEX },
2382 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2383};
2384
2385static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2386 { -60, IWL_RATE_MCS_9_INDEX },
2387 { -64, IWL_RATE_MCS_8_INDEX },
2388 { -68, IWL_RATE_MCS_7_INDEX },
2389 { -72, IWL_RATE_MCS_6_INDEX },
2390 { -80, IWL_RATE_MCS_5_INDEX },
2391 { -84, IWL_RATE_MCS_4_INDEX },
2392 { -85, IWL_RATE_MCS_3_INDEX },
2393 { -87, IWL_RATE_MCS_2_INDEX },
2394 { -88, IWL_RATE_MCS_1_INDEX },
2395 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2396};
2397
2398#define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2399
2400/* Init the optimal rate based on STA caps
2401 * This combined with rssi is used to report the last tx rate
2402 * to userspace when we haven't transmitted enough frames.
2403 */
2404static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2405 struct ieee80211_sta *sta,
2406 struct iwl_lq_sta *lq_sta)
2407{
2408 struct rs_rate *rate = &lq_sta->optimal_rate;
2409
2410 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2411 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2412 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2413 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2414 else if (lq_sta->band == NL80211_BAND_5GHZ)
2415 rate->type = LQ_LEGACY_A;
2416 else
2417 rate->type = LQ_LEGACY_G;
2418
2419 rate->bw = rs_bw_from_sta_bw(sta);
2420 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2421
2422 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2423
2424 if (is_mimo(rate)) {
2425 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2426 } else if (is_siso(rate)) {
2427 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2428 } else {
2429 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2430
2431 if (lq_sta->band == NL80211_BAND_5GHZ) {
2432 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2433 lq_sta->optimal_nentries =
2434 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2435 } else {
2436 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2437 lq_sta->optimal_nentries =
2438 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2439 }
2440 }
2441
2442 if (is_vht(rate)) {
2443 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2444 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2445 lq_sta->optimal_nentries =
2446 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2447 } else {
2448 lq_sta->optimal_rates = rs_optimal_rates_vht;
2449 lq_sta->optimal_nentries =
2450 ARRAY_SIZE(rs_optimal_rates_vht);
2451 }
2452 } else if (is_ht(rate)) {
2453 lq_sta->optimal_rates = rs_optimal_rates_ht;
2454 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2455 }
2456}
2457
2458/* Compute the optimal rate index based on RSSI */
2459static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2460 struct iwl_lq_sta *lq_sta)
2461{
2462 struct rs_rate *rate = &lq_sta->optimal_rate;
2463 int i;
2464
2465 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2466 BITS_PER_LONG);
2467
2468 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2469 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2470
2471 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2472 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2473 rate->index = rate_idx;
2474 break;
2475 }
2476 }
2477
2478 return rate;
2479}
2480
2481/* Choose an initial legacy rate and antenna to use based on the RSSI
2482 * of last Rx
2483 */
2484static void rs_get_initial_rate(struct iwl_mvm *mvm,
2485 struct ieee80211_sta *sta,
2486 struct iwl_lq_sta *lq_sta,
2487 enum nl80211_band band,
2488 struct rs_rate *rate)
2489{
2490 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2491 int i, nentries;
2492 unsigned long active_rate;
2493 s8 best_rssi = S8_MIN;
2494 u8 best_ant = ANT_NONE;
2495 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2496 const struct rs_init_rate_info *initial_rates;
2497
2498 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2499 if (!(lq_sta->pers.chains & BIT(i)))
2500 continue;
2501
2502 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2503 best_rssi = lq_sta->pers.chain_signal[i];
2504 best_ant = BIT(i);
2505 }
2506 }
2507
2508 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2509 iwl_rs_pretty_ant(best_ant), best_rssi);
2510
2511 if (best_ant != ANT_A && best_ant != ANT_B)
2512 rate->ant = first_antenna(valid_tx_ant);
2513 else
2514 rate->ant = best_ant;
2515
2516 rate->sgi = false;
2517 rate->ldpc = false;
2518 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2519
2520 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2521 BITS_PER_LONG);
2522
2523 if (band == NL80211_BAND_5GHZ) {
2524 rate->type = LQ_LEGACY_A;
2525 initial_rates = rs_optimal_rates_5ghz_legacy;
2526 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2527 } else {
2528 rate->type = LQ_LEGACY_G;
2529 initial_rates = rs_optimal_rates_24ghz_legacy;
2530 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2531 }
2532
2533 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2534 goto out;
2535
2536 /* Start from a higher rate if the corresponding debug capability
2537 * is enabled. The rate is chosen according to AP capabilities.
2538 * In case of VHT/HT when the rssi is low fallback to the case of
2539 * legacy rates.
2540 */
2541 if (sta->deflink.vht_cap.vht_supported &&
2542 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2543 /*
2544 * In AP mode, when a new station associates, rs is initialized
2545 * immediately upon association completion, before the phy
2546 * context is updated with the association parameters, so the
2547 * sta bandwidth might be wider than the phy context allows.
2548 * To avoid this issue, always initialize rs with 20mhz
2549 * bandwidth rate, and after authorization, when the phy context
2550 * is already up-to-date, re-init rs with the correct bw.
2551 */
2552 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2553 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2554
2555 switch (bw) {
2556 case RATE_MCS_CHAN_WIDTH_40:
2557 case RATE_MCS_CHAN_WIDTH_80:
2558 case RATE_MCS_CHAN_WIDTH_160:
2559 initial_rates = rs_optimal_rates_vht;
2560 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2561 break;
2562 case RATE_MCS_CHAN_WIDTH_20:
2563 initial_rates = rs_optimal_rates_vht_20mhz;
2564 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2565 break;
2566 default:
2567 IWL_ERR(mvm, "Invalid BW %d\n",
2568 sta->deflink.bandwidth);
2569 goto out;
2570 }
2571
2572 active_rate = lq_sta->active_siso_rate;
2573 rate->type = LQ_VHT_SISO;
2574 rate->bw = bw;
2575 } else if (sta->deflink.ht_cap.ht_supported &&
2576 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2577 initial_rates = rs_optimal_rates_ht;
2578 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2579 active_rate = lq_sta->active_siso_rate;
2580 rate->type = LQ_HT_SISO;
2581 } else {
2582 active_rate = lq_sta->active_legacy_rate;
2583 }
2584
2585 for (i = 0; i < nentries; i++) {
2586 int rate_idx = initial_rates[i].rate_idx;
2587
2588 if ((best_rssi >= initial_rates[i].rssi) &&
2589 (BIT(rate_idx) & active_rate)) {
2590 rate->index = rate_idx;
2591 break;
2592 }
2593 }
2594
2595out:
2596 rs_dump_rate(mvm, rate, "INITIAL");
2597}
2598
2599/* Save info about RSSI of last Rx */
2600void rs_update_last_rssi(struct iwl_mvm *mvm,
2601 struct iwl_mvm_sta *mvmsta,
2602 struct ieee80211_rx_status *rx_status)
2603{
2604 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2605 int i;
2606
2607 lq_sta->pers.chains = rx_status->chains;
2608 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2609 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2610 lq_sta->pers.last_rssi = S8_MIN;
2611
2612 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2613 if (!(lq_sta->pers.chains & BIT(i)))
2614 continue;
2615
2616 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2617 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2618 }
2619}
2620
2621/*
2622 * rs_initialize_lq - Initialize a station's hardware rate table
2623 *
2624 * The uCode's station table contains a table of fallback rates
2625 * for automatic fallback during transmission.
2626 *
2627 * NOTE: This sets up a default set of values. These will be replaced later
2628 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2629 * rc80211_simple.
2630 *
2631 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2632 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2633 * which requires station table entry to exist).
2634 */
2635static void rs_initialize_lq(struct iwl_mvm *mvm,
2636 struct ieee80211_sta *sta,
2637 struct iwl_lq_sta *lq_sta,
2638 enum nl80211_band band)
2639{
2640 struct iwl_scale_tbl_info *tbl;
2641 struct rs_rate *rate;
2642 u8 active_tbl = 0;
2643
2644 if (!sta || !lq_sta)
2645 return;
2646
2647 if (!lq_sta->search_better_tbl)
2648 active_tbl = lq_sta->active_tbl;
2649 else
2650 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2651
2652 tbl = &(lq_sta->lq_info[active_tbl]);
2653 rate = &tbl->rate;
2654
2655 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2656 rs_init_optimal_rate(mvm, sta, lq_sta);
2657
2658 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2659 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2660 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2661 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2662
2663 tbl->column = rs_get_column_from_rate(rate);
2664
2665 rs_set_expected_tpt_table(lq_sta, tbl);
2666 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2667 /* TODO restore station should remember the lq cmd */
2668 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2669}
2670
2671static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2672 void *mvm_sta,
2673 struct ieee80211_tx_rate_control *txrc)
2674{
2675 struct iwl_op_mode *op_mode = mvm_r;
2676 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2677 struct sk_buff *skb = txrc->skb;
2678 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2679 struct iwl_lq_sta *lq_sta;
2680 struct rs_rate *optimal_rate;
2681 u32 last_ucode_rate;
2682
2683 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2684 /* if vif isn't initialized mvm doesn't know about
2685 * this station, so don't do anything with the it
2686 */
2687 sta = NULL;
2688 mvm_sta = NULL;
2689 }
2690
2691 if (!mvm_sta)
2692 return;
2693
2694 lq_sta = mvm_sta;
2695 iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags,
2696 info->band, &info->control.rates[0]);
2697 info->control.rates[0].count = 1;
2698
2699 /* Report the optimal rate based on rssi and STA caps if we haven't
2700 * converged yet (too little traffic) or exploring other modulations
2701 */
2702 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2703 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2704 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2705 optimal_rate);
2706 iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band,
2707 &txrc->reported_rate);
2708 }
2709}
2710
2711static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2712 gfp_t gfp)
2713{
2714 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2715 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2716 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2717 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2718
2719 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2720
2721 lq_sta->pers.drv = mvm;
2722#ifdef CONFIG_MAC80211_DEBUGFS
2723 lq_sta->pers.dbg_fixed_rate = 0;
2724 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2725 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2726#endif
2727 lq_sta->pers.chains = 0;
2728 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2729 lq_sta->pers.last_rssi = S8_MIN;
2730
2731 return lq_sta;
2732}
2733
2734static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2735 int nss)
2736{
2737 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2738 (0x3 << (2 * (nss - 1)));
2739 rx_mcs >>= (2 * (nss - 1));
2740
2741 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2742 return IWL_RATE_MCS_7_INDEX;
2743 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2744 return IWL_RATE_MCS_8_INDEX;
2745 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2746 return IWL_RATE_MCS_9_INDEX;
2747
2748 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2749 return -1;
2750}
2751
2752static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2753 struct ieee80211_sta_vht_cap *vht_cap,
2754 struct iwl_lq_sta *lq_sta)
2755{
2756 int i;
2757 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2758
2759 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2760 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2761 if (i == IWL_RATE_9M_INDEX)
2762 continue;
2763
2764 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2765 if (i == IWL_RATE_MCS_9_INDEX &&
2766 sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2767 continue;
2768
2769 lq_sta->active_siso_rate |= BIT(i);
2770 }
2771 }
2772
2773 if (sta->deflink.rx_nss < 2)
2774 return;
2775
2776 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2777 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2778 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2779 if (i == IWL_RATE_9M_INDEX)
2780 continue;
2781
2782 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2783 if (i == IWL_RATE_MCS_9_INDEX &&
2784 sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2785 continue;
2786
2787 lq_sta->active_mimo2_rate |= BIT(i);
2788 }
2789 }
2790}
2791
2792static void rs_ht_init(struct iwl_mvm *mvm,
2793 struct ieee80211_sta *sta,
2794 struct iwl_lq_sta *lq_sta,
2795 struct ieee80211_sta_ht_cap *ht_cap)
2796{
2797 /* active_siso_rate mask includes 9 MBits (bit 5),
2798 * and CCK (bits 0-3), supp_rates[] does not;
2799 * shift to convert format, force 9 MBits off.
2800 */
2801 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2802 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2803 lq_sta->active_siso_rate &= ~((u16)0x2);
2804 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2805
2806 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2807 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2808 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2809 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2810
2811 if (mvm->cfg->ht_params->ldpc &&
2812 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2813 lq_sta->ldpc = true;
2814
2815 if (mvm->cfg->ht_params->stbc &&
2816 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2817 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2818 lq_sta->stbc_capable = true;
2819
2820 lq_sta->is_vht = false;
2821}
2822
2823static void rs_vht_init(struct iwl_mvm *mvm,
2824 struct ieee80211_sta *sta,
2825 struct iwl_lq_sta *lq_sta,
2826 struct ieee80211_sta_vht_cap *vht_cap)
2827{
2828 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2829
2830 if (mvm->cfg->ht_params->ldpc &&
2831 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2832 lq_sta->ldpc = true;
2833
2834 if (mvm->cfg->ht_params->stbc &&
2835 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2836 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2837 lq_sta->stbc_capable = true;
2838
2839 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2840 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2841 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2842 lq_sta->bfer_capable = true;
2843
2844 lq_sta->is_vht = true;
2845}
2846
2847#ifdef CONFIG_IWLWIFI_DEBUGFS
2848void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2849{
2850 spin_lock_bh(&mvm->drv_stats_lock);
2851 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2852 spin_unlock_bh(&mvm->drv_stats_lock);
2853}
2854
2855void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2856{
2857 u8 nss = 0;
2858
2859 spin_lock(&mvm->drv_stats_lock);
2860
2861 if (agg)
2862 mvm->drv_rx_stats.agg_frames++;
2863
2864 mvm->drv_rx_stats.success_frames++;
2865
2866 switch (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) {
2867 case RATE_MCS_CHAN_WIDTH_20:
2868 mvm->drv_rx_stats.bw_20_frames++;
2869 break;
2870 case RATE_MCS_CHAN_WIDTH_40:
2871 mvm->drv_rx_stats.bw_40_frames++;
2872 break;
2873 case RATE_MCS_CHAN_WIDTH_80:
2874 mvm->drv_rx_stats.bw_80_frames++;
2875 break;
2876 case RATE_MCS_CHAN_WIDTH_160:
2877 mvm->drv_rx_stats.bw_160_frames++;
2878 break;
2879 default:
2880 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2881 }
2882
2883 if (rate & RATE_MCS_HT_MSK_V1) {
2884 mvm->drv_rx_stats.ht_frames++;
2885 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) >> RATE_HT_MCS_NSS_POS_V1) + 1;
2886 } else if (rate & RATE_MCS_VHT_MSK_V1) {
2887 mvm->drv_rx_stats.vht_frames++;
2888 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2889 RATE_VHT_MCS_NSS_POS) + 1;
2890 } else {
2891 mvm->drv_rx_stats.legacy_frames++;
2892 }
2893
2894 if (nss == 1)
2895 mvm->drv_rx_stats.siso_frames++;
2896 else if (nss == 2)
2897 mvm->drv_rx_stats.mimo2_frames++;
2898
2899 if (rate & RATE_MCS_SGI_MSK_V1)
2900 mvm->drv_rx_stats.sgi_frames++;
2901 else
2902 mvm->drv_rx_stats.ngi_frames++;
2903
2904 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2905 mvm->drv_rx_stats.last_frame_idx =
2906 (mvm->drv_rx_stats.last_frame_idx + 1) %
2907 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2908
2909 spin_unlock(&mvm->drv_stats_lock);
2910}
2911#endif
2912
2913/*
2914 * Called after adding a new station to initialize rate scaling
2915 */
2916static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2917 enum nl80211_band band)
2918{
2919 int i, j;
2920 struct ieee80211_hw *hw = mvm->hw;
2921 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2922 struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
2923 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2924 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2925 struct ieee80211_supported_band *sband;
2926 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2927
2928 lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock);
2929
2930 /* clear all non-persistent lq data */
2931 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2932
2933 sband = hw->wiphy->bands[band];
2934
2935 lq_sta->lq.sta_id = mvmsta->sta_id;
2936 mvmsta->amsdu_enabled = 0;
2937 mvmsta->max_amsdu_len = sta->cur->max_amsdu_len;
2938
2939 for (j = 0; j < LQ_SIZE; j++)
2940 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2941
2942 lq_sta->flush_timer = 0;
2943 lq_sta->last_tx = jiffies;
2944
2945 IWL_DEBUG_RATE(mvm,
2946 "LQ: *** rate scale station global init for station %d ***\n",
2947 mvmsta->sta_id);
2948 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2949 * the lowest or the highest rate.. Could consider using RSSI from
2950 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2951 * after assoc.. */
2952
2953 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2954 lq_sta->band = sband->band;
2955 /*
2956 * active legacy rates as per supported rates bitmap
2957 */
2958 supp = sta->deflink.supp_rates[sband->band];
2959 lq_sta->active_legacy_rate = 0;
2960 for_each_set_bit(i, &supp, BITS_PER_LONG)
2961 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2962
2963 /* TODO: should probably account for rx_highest for both HT/VHT */
2964 if (!vht_cap || !vht_cap->vht_supported)
2965 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2966 else
2967 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2968
2969 lq_sta->max_legacy_rate_idx =
2970 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2971 lq_sta->max_siso_rate_idx =
2972 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2973 lq_sta->max_mimo2_rate_idx =
2974 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2975
2976 IWL_DEBUG_RATE(mvm,
2977 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2978 lq_sta->active_legacy_rate,
2979 lq_sta->active_siso_rate,
2980 lq_sta->active_mimo2_rate,
2981 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2982 lq_sta->bfer_capable);
2983 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2984 lq_sta->max_legacy_rate_idx,
2985 lq_sta->max_siso_rate_idx,
2986 lq_sta->max_mimo2_rate_idx);
2987
2988 /* These values will be overridden later */
2989 lq_sta->lq.single_stream_ant_msk =
2990 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
2991 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2992
2993 /* as default allow aggregation for all tids */
2994 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2995 lq_sta->is_agg = 0;
2996#ifdef CONFIG_IWLWIFI_DEBUGFS
2997 iwl_mvm_reset_frame_stats(mvm);
2998#endif
2999 rs_initialize_lq(mvm, sta, lq_sta, band);
3000}
3001
3002static void rs_drv_rate_update(void *mvm_r,
3003 struct ieee80211_supported_band *sband,
3004 struct cfg80211_chan_def *chandef,
3005 struct ieee80211_sta *sta,
3006 void *priv_sta, u32 changed)
3007{
3008 struct iwl_op_mode *op_mode = mvm_r;
3009 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3010 u8 tid;
3011
3012 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3013 return;
3014
3015 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3016 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3017 ieee80211_stop_tx_ba_session(sta, tid);
3018
3019 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3020}
3021
3022static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3023 struct ieee80211_sta *sta,
3024 int tid, struct ieee80211_tx_info *info,
3025 bool ndp)
3026{
3027 int legacy_success;
3028 int retries;
3029 int i;
3030 struct iwl_lq_cmd *table;
3031 u32 lq_hwrate;
3032 struct rs_rate lq_rate, tx_resp_rate;
3033 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3034 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3035 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3036 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3037 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3038 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3039 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3040
3041 if (!lq_sta->pers.drv) {
3042 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3043 return;
3044 }
3045
3046 /* This packet was aggregated but doesn't carry status info */
3047 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3048 !(info->flags & IEEE80211_TX_STAT_AMPDU))
3049 return;
3050
3051 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3052 &tx_resp_rate)) {
3053 WARN_ON_ONCE(1);
3054 return;
3055 }
3056
3057#ifdef CONFIG_MAC80211_DEBUGFS
3058 /* Disable last tx check if we are debugging with fixed rate but
3059 * update tx stats
3060 */
3061 if (lq_sta->pers.dbg_fixed_rate) {
3062 int index = tx_resp_rate.index;
3063 enum rs_column column;
3064 int attempts, success;
3065
3066 column = rs_get_column_from_rate(&tx_resp_rate);
3067 if (WARN_ONCE(column == RS_COLUMN_INVALID,
3068 "Can't map rate 0x%x to column",
3069 tx_resp_hwrate))
3070 return;
3071
3072 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3073 attempts = info->status.ampdu_len;
3074 success = info->status.ampdu_ack_len;
3075 } else {
3076 attempts = info->status.rates[0].count;
3077 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3078 }
3079
3080 lq_sta->pers.tx_stats[column][index].total += attempts;
3081 lq_sta->pers.tx_stats[column][index].success += success;
3082
3083 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3084 tx_resp_hwrate, success, attempts);
3085 return;
3086 }
3087#endif
3088
3089 if (time_after(jiffies,
3090 (unsigned long)(lq_sta->last_tx +
3091 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3092 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3093 /* reach here only in case of driver RS, call directly
3094 * the unlocked version
3095 */
3096 rs_drv_rate_init(mvm, sta, info->band);
3097 return;
3098 }
3099 lq_sta->last_tx = jiffies;
3100
3101 /* Ignore this Tx frame response if its initial rate doesn't match
3102 * that of latest Link Quality command. There may be stragglers
3103 * from a previous Link Quality command, but we're no longer interested
3104 * in those; they're either from the "active" mode while we're trying
3105 * to check "search" mode, or a prior "search" mode after we've moved
3106 * to a new "search" mode (which might become the new "active" mode).
3107 */
3108 table = &lq_sta->lq;
3109 lq_hwrate = le32_to_cpu(table->rs_table[0]);
3110 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3111 WARN_ON_ONCE(1);
3112 return;
3113 }
3114
3115 /* Here we actually compare this rate to the latest LQ command */
3116 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3117 IWL_DEBUG_RATE(mvm,
3118 "tx resp color 0x%x does not match 0x%x\n",
3119 lq_color, LQ_FLAG_COLOR_GET(table->flags));
3120
3121 /* Since rates mis-match, the last LQ command may have failed.
3122 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3123 * ... driver.
3124 */
3125 lq_sta->missed_rate_counter++;
3126 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3127 lq_sta->missed_rate_counter = 0;
3128 IWL_DEBUG_RATE(mvm,
3129 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3130 lq_sta->rs_state);
3131 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3132 }
3133 /* Regardless, ignore this status info for outdated rate */
3134 return;
3135 }
3136
3137 /* Rate did match, so reset the missed_rate_counter */
3138 lq_sta->missed_rate_counter = 0;
3139
3140 if (!lq_sta->search_better_tbl) {
3141 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3142 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3143 } else {
3144 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3145 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3146 }
3147
3148 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3149 IWL_DEBUG_RATE(mvm,
3150 "Neither active nor search matches tx rate\n");
3151 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3152 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3153 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3154 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3155 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3156
3157 /* no matching table found, let's by-pass the data collection
3158 * and continue to perform rate scale to find the rate table
3159 */
3160 rs_stay_in_table(lq_sta, true);
3161 goto done;
3162 }
3163
3164 /* Updating the frame history depends on whether packets were
3165 * aggregated.
3166 *
3167 * For aggregation, all packets were transmitted at the same rate, the
3168 * first index into rate scale table.
3169 */
3170 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3171 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3172 info->status.ampdu_len,
3173 info->status.ampdu_ack_len,
3174 reduced_txp);
3175
3176 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3177 * it as a single frame loss as we don't want the success ratio
3178 * to dip too quickly because a BA wasn't received.
3179 * For TPC, there's no need for this optimisation since we want
3180 * to recover very quickly from a bad power reduction and,
3181 * therefore we'd like the success ratio to get an immediate hit
3182 * when failing to get a BA, so we'd switch back to a lower or
3183 * zero power reduction. When FW transmits agg with a rate
3184 * different from the initial rate, it will not use reduced txp
3185 * and will send BA notification twice (one empty with reduced
3186 * txp equal to the value from LQ and one with reduced txp 0).
3187 * We need to update counters for each txp level accordingly.
3188 */
3189 if (info->status.ampdu_ack_len == 0)
3190 info->status.ampdu_len = 1;
3191
3192 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3193 tx_resp_rate.index,
3194 info->status.ampdu_len,
3195 info->status.ampdu_ack_len);
3196
3197 /* Update success/fail counts if not searching for new mode */
3198 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3199 lq_sta->total_success += info->status.ampdu_ack_len;
3200 lq_sta->total_failed += (info->status.ampdu_len -
3201 info->status.ampdu_ack_len);
3202 }
3203 } else {
3204 /* For legacy, update frame history with for each Tx retry. */
3205 retries = info->status.rates[0].count - 1;
3206 /* HW doesn't send more than 15 retries */
3207 retries = min(retries, 15);
3208
3209 /* The last transmission may have been successful */
3210 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3211 /* Collect data for each rate used during failed TX attempts */
3212 for (i = 0; i <= retries; ++i) {
3213 lq_hwrate = le32_to_cpu(table->rs_table[i]);
3214 if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3215 &lq_rate)) {
3216 WARN_ON_ONCE(1);
3217 return;
3218 }
3219
3220 /* Only collect stats if retried rate is in the same RS
3221 * table as active/search.
3222 */
3223 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3224 tmp_tbl = curr_tbl;
3225 else if (rs_rate_column_match(&lq_rate,
3226 &other_tbl->rate))
3227 tmp_tbl = other_tbl;
3228 else
3229 continue;
3230
3231 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3232 tx_resp_rate.index, 1,
3233 i < retries ? 0 : legacy_success,
3234 reduced_txp);
3235 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3236 tx_resp_rate.index, 1,
3237 i < retries ? 0 : legacy_success);
3238 }
3239
3240 /* Update success/fail counts if not searching for new mode */
3241 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3242 lq_sta->total_success += legacy_success;
3243 lq_sta->total_failed += retries + (1 - legacy_success);
3244 }
3245 }
3246 /* The last TX rate is cached in lq_sta; it's set in if/else above */
3247 lq_sta->last_rate_n_flags = lq_hwrate;
3248 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3249done:
3250 /* See if there's a better rate or modulation mode to try. */
3251 if (sta->deflink.supp_rates[info->band])
3252 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3253}
3254
3255void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3256 int tid, struct ieee80211_tx_info *info, bool ndp)
3257{
3258 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3259
3260 /* If it's locked we are in middle of init flow
3261 * just wait for next tx status to update the lq_sta data
3262 */
3263 if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock))
3264 return;
3265
3266 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3267 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
3268}
3269
3270#ifdef CONFIG_MAC80211_DEBUGFS
3271static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3272 struct iwl_lq_cmd *lq_cmd,
3273 enum nl80211_band band,
3274 u32 ucode_rate)
3275{
3276 struct rs_rate rate;
3277 int i;
3278 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3279 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3280 u8 ant = (ucode_rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3281
3282 for (i = 0; i < num_rates; i++)
3283 lq_cmd->rs_table[i] = ucode_rate_le32;
3284
3285 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3286 WARN_ON_ONCE(1);
3287 return;
3288 }
3289
3290 if (is_mimo(&rate))
3291 lq_cmd->mimo_delim = num_rates - 1;
3292 else
3293 lq_cmd->mimo_delim = 0;
3294
3295 lq_cmd->reduced_tpc = 0;
3296
3297 if (num_of_ant(ant) == 1)
3298 lq_cmd->single_stream_ant_msk = ant;
3299
3300 if (!mvm->trans->trans_cfg->gen2)
3301 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3302 else
3303 lq_cmd->agg_frame_cnt_limit =
3304 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3305}
3306#endif /* CONFIG_MAC80211_DEBUGFS */
3307
3308static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3309 struct iwl_lq_sta *lq_sta,
3310 struct rs_rate *rate,
3311 __le32 *rs_table, int *rs_table_index,
3312 int num_rates, int num_retries,
3313 u8 valid_tx_ant, bool toggle_ant)
3314{
3315 int i, j;
3316 __le32 ucode_rate;
3317 bool bottom_reached = false;
3318 int prev_rate_idx = rate->index;
3319 int end = LINK_QUAL_MAX_RETRY_NUM;
3320 int index = *rs_table_index;
3321
3322 for (i = 0; i < num_rates && index < end; i++) {
3323 for (j = 0; j < num_retries && index < end; j++, index++) {
3324 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3325 rate));
3326 rs_table[index] = ucode_rate;
3327 if (toggle_ant)
3328 rs_toggle_antenna(valid_tx_ant, rate);
3329 }
3330
3331 prev_rate_idx = rate->index;
3332 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3333 if (bottom_reached && !is_legacy(rate))
3334 break;
3335 }
3336
3337 if (!bottom_reached && !is_legacy(rate))
3338 rate->index = prev_rate_idx;
3339
3340 *rs_table_index = index;
3341}
3342
3343/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3344 * column the rate table should look like this:
3345 *
3346 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3347 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3348 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3349 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3350 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3351 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3352 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3353 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3354 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3355 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3356 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3357 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3358 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3359 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3360 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3361 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3362 */
3363static void rs_build_rates_table(struct iwl_mvm *mvm,
3364 struct ieee80211_sta *sta,
3365 struct iwl_lq_sta *lq_sta,
3366 const struct rs_rate *initial_rate)
3367{
3368 struct rs_rate rate;
3369 int num_rates, num_retries, index = 0;
3370 u8 valid_tx_ant = 0;
3371 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3372 bool toggle_ant = false;
3373 u32 color;
3374
3375 memcpy(&rate, initial_rate, sizeof(rate));
3376
3377 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3378
3379 /* TODO: remove old API when min FW API hits 14 */
3380 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3381 rs_stbc_allow(mvm, sta, lq_sta))
3382 rate.stbc = true;
3383
3384 if (is_siso(&rate)) {
3385 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3386 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3387 } else if (is_mimo(&rate)) {
3388 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3389 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3390 } else {
3391 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3392 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3393 toggle_ant = true;
3394 }
3395
3396 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3397 num_rates, num_retries, valid_tx_ant,
3398 toggle_ant);
3399
3400 rs_get_lower_rate_down_column(lq_sta, &rate);
3401
3402 if (is_siso(&rate)) {
3403 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3404 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3405 lq_cmd->mimo_delim = index;
3406 } else if (is_legacy(&rate)) {
3407 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3408 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3409 } else {
3410 WARN_ON_ONCE(1);
3411 }
3412
3413 toggle_ant = true;
3414
3415 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3416 num_rates, num_retries, valid_tx_ant,
3417 toggle_ant);
3418
3419 rs_get_lower_rate_down_column(lq_sta, &rate);
3420
3421 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3422 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3423
3424 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3425 num_rates, num_retries, valid_tx_ant,
3426 toggle_ant);
3427
3428 /* update the color of the LQ command (as a counter at bits 1-3) */
3429 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3430 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3431}
3432
3433struct rs_bfer_active_iter_data {
3434 struct ieee80211_sta *exclude_sta;
3435 struct iwl_mvm_sta *bfer_mvmsta;
3436};
3437
3438static void rs_bfer_active_iter(void *_data,
3439 struct ieee80211_sta *sta)
3440{
3441 struct rs_bfer_active_iter_data *data = _data;
3442 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3443 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3444 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3445
3446 if (sta == data->exclude_sta)
3447 return;
3448
3449 /* The current sta has BFER allowed */
3450 if (ss_params & LQ_SS_BFER_ALLOWED) {
3451 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3452
3453 data->bfer_mvmsta = mvmsta;
3454 }
3455}
3456
3457static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3458{
3459 int prio = -1;
3460 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3461
3462 switch (viftype) {
3463 case NL80211_IFTYPE_AP:
3464 case NL80211_IFTYPE_P2P_GO:
3465 prio = 3;
3466 break;
3467 case NL80211_IFTYPE_P2P_CLIENT:
3468 prio = 2;
3469 break;
3470 case NL80211_IFTYPE_STATION:
3471 prio = 1;
3472 break;
3473 default:
3474 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3475 prio = -1;
3476 }
3477
3478 return prio;
3479}
3480
3481/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3482static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3483 struct iwl_mvm_sta *sta2)
3484{
3485 int prio1 = rs_bfer_priority(sta1);
3486 int prio2 = rs_bfer_priority(sta2);
3487
3488 if (prio1 > prio2)
3489 return 1;
3490 if (prio1 < prio2)
3491 return -1;
3492 return 0;
3493}
3494
3495static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3496 struct ieee80211_sta *sta,
3497 struct iwl_lq_sta *lq_sta,
3498 const struct rs_rate *initial_rate)
3499{
3500 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3501 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3502 struct rs_bfer_active_iter_data data = {
3503 .exclude_sta = sta,
3504 .bfer_mvmsta = NULL,
3505 };
3506 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3507 u32 ss_params = LQ_SS_PARAMS_VALID;
3508
3509 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3510 goto out;
3511
3512#ifdef CONFIG_MAC80211_DEBUGFS
3513 /* Check if forcing the decision is configured.
3514 * Note that SISO is forced by not allowing STBC or BFER
3515 */
3516 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3517 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3518 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3519 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3520
3521 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3522 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3523 lq_sta->pers.ss_force);
3524 goto out;
3525 }
3526#endif
3527
3528 if (lq_sta->stbc_capable)
3529 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3530
3531 if (!lq_sta->bfer_capable)
3532 goto out;
3533
3534 ieee80211_iterate_stations_atomic(mvm->hw,
3535 rs_bfer_active_iter,
3536 &data);
3537 bfer_mvmsta = data.bfer_mvmsta;
3538
3539 /* This code is safe as it doesn't run concurrently for different
3540 * stations. This is guaranteed by the fact that calls to
3541 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3542 */
3543 if (!bfer_mvmsta) {
3544 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3545
3546 ss_params |= LQ_SS_BFER_ALLOWED;
3547 goto out;
3548 }
3549
3550 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3551 bfer_mvmsta->sta_id);
3552
3553 /* Disallow BFER on another STA if active and we're a higher priority */
3554 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3555 struct iwl_lq_cmd *bfersta_lq_cmd =
3556 &bfer_mvmsta->lq_sta.rs_drv.lq;
3557 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3558
3559 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3560 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3561 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3562
3563 ss_params |= LQ_SS_BFER_ALLOWED;
3564 IWL_DEBUG_RATE(mvm,
3565 "Lower priority BFER sta found (%d). Switch BFER\n",
3566 bfer_mvmsta->sta_id);
3567 }
3568out:
3569 lq_cmd->ss_params = cpu_to_le32(ss_params);
3570}
3571
3572static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3573 struct ieee80211_sta *sta,
3574 struct iwl_lq_sta *lq_sta,
3575 const struct rs_rate *initial_rate)
3576{
3577 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3578 struct iwl_mvm_sta *mvmsta;
3579 struct iwl_mvm_vif *mvmvif;
3580
3581 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3582 lq_cmd->agg_time_limit =
3583 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3584
3585#ifdef CONFIG_MAC80211_DEBUGFS
3586 if (lq_sta->pers.dbg_fixed_rate) {
3587 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3588 lq_sta->band,
3589 lq_sta->pers.dbg_fixed_rate);
3590 return;
3591 }
3592#endif
3593 if (WARN_ON_ONCE(!sta || !initial_rate))
3594 return;
3595
3596 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3597
3598 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3599 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3600
3601 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3602 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3603
3604 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3605 num_of_ant(initial_rate->ant) == 1)
3606 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3607
3608 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3609
3610 /*
3611 * In case of low latency, tell the firmware to leave a frame in the
3612 * Tx Fifo so that it can start a transaction in the same TxOP. This
3613 * basically allows the firmware to send bursts.
3614 */
3615 if (iwl_mvm_vif_low_latency(mvmvif))
3616 lq_cmd->agg_frame_cnt_limit--;
3617
3618 if (mvmsta->vif->p2p)
3619 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3620
3621 lq_cmd->agg_time_limit =
3622 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3623}
3624
3625static void *rs_alloc(struct ieee80211_hw *hw)
3626{
3627 return hw->priv;
3628}
3629
3630/* rate scale requires free function to be implemented */
3631static void rs_free(void *mvm_rate)
3632{
3633 return;
3634}
3635
3636static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3637{
3638 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3639 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3640
3641 IWL_DEBUG_RATE(mvm, "enter\n");
3642 IWL_DEBUG_RATE(mvm, "leave\n");
3643}
3644
3645int rs_pretty_print_rate_v1(char *buf, int bufsz, const u32 rate)
3646{
3647
3648 char *type;
3649 u8 mcs = 0, nss = 0;
3650 u8 ant = (rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3651 u32 bw = (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) >>
3652 RATE_MCS_CHAN_WIDTH_POS;
3653
3654 if (!(rate & RATE_MCS_HT_MSK_V1) &&
3655 !(rate & RATE_MCS_VHT_MSK_V1) &&
3656 !(rate & RATE_MCS_HE_MSK_V1)) {
3657 int index = iwl_hwrate_to_plcp_idx(rate);
3658
3659 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3660 iwl_rs_pretty_ant(ant),
3661 index == IWL_RATE_INVALID ? "BAD" :
3662 iwl_rate_mcs(index)->mbps);
3663 }
3664
3665 if (rate & RATE_MCS_VHT_MSK_V1) {
3666 type = "VHT";
3667 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3668 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3669 >> RATE_VHT_MCS_NSS_POS) + 1;
3670 } else if (rate & RATE_MCS_HT_MSK_V1) {
3671 type = "HT";
3672 mcs = rate & RATE_HT_MCS_INDEX_MSK_V1;
3673 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1)
3674 >> RATE_HT_MCS_NSS_POS_V1) + 1;
3675 } else if (rate & RATE_MCS_HE_MSK_V1) {
3676 type = "HE";
3677 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3678 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3679 >> RATE_VHT_MCS_NSS_POS) + 1;
3680 } else {
3681 type = "Unknown"; /* shouldn't happen */
3682 }
3683
3684 return scnprintf(buf, bufsz,
3685 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s",
3686 rate, type, iwl_rs_pretty_ant(ant), iwl_rs_pretty_bw(bw), mcs, nss,
3687 (rate & RATE_MCS_SGI_MSK_V1) ? "SGI " : "NGI ",
3688 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3689 (rate & RATE_MCS_LDPC_MSK_V1) ? "LDPC " : "",
3690 (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "",
3691 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3692}
3693
3694#ifdef CONFIG_MAC80211_DEBUGFS
3695/*
3696 * Program the device to use fixed rate for frame transmit
3697 * This is for debugging/testing only
3698 * once the device start use fixed rate, we need to reload the module
3699 * to being back the normal operation.
3700 */
3701static void rs_program_fix_rate(struct iwl_mvm *mvm,
3702 struct iwl_lq_sta *lq_sta)
3703{
3704 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3705 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3706 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3707
3708 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3709 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3710
3711 if (lq_sta->pers.dbg_fixed_rate) {
3712 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3713 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3714 }
3715}
3716
3717static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3718 const char __user *user_buf, size_t count, loff_t *ppos)
3719{
3720 struct iwl_lq_sta *lq_sta = file->private_data;
3721 struct iwl_mvm *mvm;
3722 char buf[64];
3723 size_t buf_size;
3724 u32 parsed_rate;
3725
3726 mvm = lq_sta->pers.drv;
3727 memset(buf, 0, sizeof(buf));
3728 buf_size = min(count, sizeof(buf) - 1);
3729 if (copy_from_user(buf, user_buf, buf_size))
3730 return -EFAULT;
3731
3732 if (sscanf(buf, "%x", &parsed_rate) == 1)
3733 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3734 else
3735 lq_sta->pers.dbg_fixed_rate = 0;
3736
3737 rs_program_fix_rate(mvm, lq_sta);
3738
3739 return count;
3740}
3741
3742static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3743 char __user *user_buf, size_t count, loff_t *ppos)
3744{
3745 char *buff;
3746 int desc = 0;
3747 int i = 0;
3748 ssize_t ret;
3749 static const size_t bufsz = 2048;
3750
3751 struct iwl_lq_sta *lq_sta = file->private_data;
3752 struct iwl_mvm_sta *mvmsta =
3753 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3754 struct iwl_mvm *mvm;
3755 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3756 struct rs_rate *rate = &tbl->rate;
3757 u32 ss_params;
3758
3759 mvm = lq_sta->pers.drv;
3760 buff = kmalloc(bufsz, GFP_KERNEL);
3761 if (!buff)
3762 return -ENOMEM;
3763
3764 desc += scnprintf(buff + desc, bufsz - desc,
3765 "sta_id %d\n", lq_sta->lq.sta_id);
3766 desc += scnprintf(buff + desc, bufsz - desc,
3767 "failed=%d success=%d rate=0%lX\n",
3768 lq_sta->total_failed, lq_sta->total_success,
3769 lq_sta->active_legacy_rate);
3770 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3771 lq_sta->pers.dbg_fixed_rate);
3772 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s\n",
3773 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3774 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "");
3775 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3776 (is_legacy(rate)) ? "legacy" :
3777 is_vht(rate) ? "VHT" : "HT");
3778 if (!is_legacy(rate)) {
3779 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3780 (is_siso(rate)) ? "SISO" : "MIMO2");
3781 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3782 (is_ht20(rate)) ? "20MHz" :
3783 (is_ht40(rate)) ? "40MHz" :
3784 (is_ht80(rate)) ? "80MHz" :
3785 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3786 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3787 (rate->sgi) ? "SGI" : "NGI",
3788 (rate->ldpc) ? "LDPC" : "BCC",
3789 (lq_sta->is_agg) ? "AGG on" : "",
3790 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3791 }
3792 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3793 lq_sta->last_rate_n_flags);
3794 desc += scnprintf(buff + desc, bufsz - desc,
3795 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3796 lq_sta->lq.flags,
3797 lq_sta->lq.mimo_delim,
3798 lq_sta->lq.single_stream_ant_msk,
3799 lq_sta->lq.dual_stream_ant_msk);
3800
3801 desc += scnprintf(buff + desc, bufsz - desc,
3802 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3803 le16_to_cpu(lq_sta->lq.agg_time_limit),
3804 lq_sta->lq.agg_disable_start_th,
3805 lq_sta->lq.agg_frame_cnt_limit);
3806
3807 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3808 lq_sta->lq.reduced_tpc);
3809 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3810 desc += scnprintf(buff + desc, bufsz - desc,
3811 "single stream params: %s%s%s%s\n",
3812 (ss_params & LQ_SS_PARAMS_VALID) ?
3813 "VALID" : "INVALID",
3814 (ss_params & LQ_SS_BFER_ALLOWED) ?
3815 ", BFER" : "",
3816 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3817 ", STBC" : "",
3818 (ss_params & LQ_SS_FORCE) ?
3819 ", FORCE" : "");
3820 desc += scnprintf(buff + desc, bufsz - desc,
3821 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3822 lq_sta->lq.initial_rate_index[0],
3823 lq_sta->lq.initial_rate_index[1],
3824 lq_sta->lq.initial_rate_index[2],
3825 lq_sta->lq.initial_rate_index[3]);
3826
3827 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3828 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3829
3830 desc += scnprintf(buff + desc, bufsz - desc,
3831 " rate[%d] 0x%X ", i, r);
3832 desc += rs_pretty_print_rate_v1(buff + desc, bufsz - desc, r);
3833 if (desc < bufsz - 1)
3834 buff[desc++] = '\n';
3835 }
3836
3837 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3838 kfree(buff);
3839 return ret;
3840}
3841
3842static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3843 .write = rs_sta_dbgfs_scale_table_write,
3844 .read = rs_sta_dbgfs_scale_table_read,
3845 .open = simple_open,
3846 .llseek = default_llseek,
3847};
3848static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3849 char __user *user_buf, size_t count, loff_t *ppos)
3850{
3851 char *buff;
3852 int desc = 0;
3853 int i, j;
3854 ssize_t ret;
3855 struct iwl_scale_tbl_info *tbl;
3856 struct rs_rate *rate;
3857 struct iwl_lq_sta *lq_sta = file->private_data;
3858
3859 buff = kmalloc(1024, GFP_KERNEL);
3860 if (!buff)
3861 return -ENOMEM;
3862
3863 for (i = 0; i < LQ_SIZE; i++) {
3864 tbl = &(lq_sta->lq_info[i]);
3865 rate = &tbl->rate;
3866 desc += sprintf(buff+desc,
3867 "%s type=%d SGI=%d BW=%s DUP=0\n"
3868 "index=%d\n",
3869 lq_sta->active_tbl == i ? "*" : "x",
3870 rate->type,
3871 rate->sgi,
3872 is_ht20(rate) ? "20MHz" :
3873 is_ht40(rate) ? "40MHz" :
3874 is_ht80(rate) ? "80MHz" :
3875 is_ht160(rate) ? "160MHz" : "ERR",
3876 rate->index);
3877 for (j = 0; j < IWL_RATE_COUNT; j++) {
3878 desc += sprintf(buff+desc,
3879 "counter=%d success=%d %%=%d\n",
3880 tbl->win[j].counter,
3881 tbl->win[j].success_counter,
3882 tbl->win[j].success_ratio);
3883 }
3884 }
3885 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3886 kfree(buff);
3887 return ret;
3888}
3889
3890static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3891 .read = rs_sta_dbgfs_stats_table_read,
3892 .open = simple_open,
3893 .llseek = default_llseek,
3894};
3895
3896static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3897 char __user *user_buf,
3898 size_t count, loff_t *ppos)
3899{
3900 static const char * const column_name[] = {
3901 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3902 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3903 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3904 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3905 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3906 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3907 [RS_COLUMN_MIMO2] = "MIMO2",
3908 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3909 };
3910
3911 static const char * const rate_name[] = {
3912 [IWL_RATE_1M_INDEX] = "1M",
3913 [IWL_RATE_2M_INDEX] = "2M",
3914 [IWL_RATE_5M_INDEX] = "5.5M",
3915 [IWL_RATE_11M_INDEX] = "11M",
3916 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3917 [IWL_RATE_9M_INDEX] = "9M",
3918 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3919 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3920 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3921 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3922 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3923 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3924 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3925 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3926 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3927 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3928 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3929 };
3930
3931 char *buff, *pos, *endpos;
3932 int col, rate;
3933 ssize_t ret;
3934 struct iwl_lq_sta *lq_sta = file->private_data;
3935 struct rs_rate_stats *stats;
3936 static const size_t bufsz = 1024;
3937
3938 buff = kmalloc(bufsz, GFP_KERNEL);
3939 if (!buff)
3940 return -ENOMEM;
3941
3942 pos = buff;
3943 endpos = pos + bufsz;
3944
3945 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3946 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3947 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3948 pos += scnprintf(pos, endpos - pos, "\n");
3949
3950 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3951 pos += scnprintf(pos, endpos - pos,
3952 "%s,", column_name[col]);
3953
3954 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3955 stats = &(lq_sta->pers.tx_stats[col][rate]);
3956 pos += scnprintf(pos, endpos - pos,
3957 "%llu/%llu,",
3958 stats->success,
3959 stats->total);
3960 }
3961 pos += scnprintf(pos, endpos - pos, "\n");
3962 }
3963
3964 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3965 kfree(buff);
3966 return ret;
3967}
3968
3969static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3970 const char __user *user_buf,
3971 size_t count, loff_t *ppos)
3972{
3973 struct iwl_lq_sta *lq_sta = file->private_data;
3974 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3975
3976 return count;
3977}
3978
3979static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3980 .read = rs_sta_dbgfs_drv_tx_stats_read,
3981 .write = rs_sta_dbgfs_drv_tx_stats_write,
3982 .open = simple_open,
3983 .llseek = default_llseek,
3984};
3985
3986static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3987 char __user *user_buf,
3988 size_t count, loff_t *ppos)
3989{
3990 struct iwl_lq_sta *lq_sta = file->private_data;
3991 char buf[12];
3992 int bufsz = sizeof(buf);
3993 int pos = 0;
3994 static const char * const ss_force_name[] = {
3995 [RS_SS_FORCE_NONE] = "none",
3996 [RS_SS_FORCE_STBC] = "stbc",
3997 [RS_SS_FORCE_BFER] = "bfer",
3998 [RS_SS_FORCE_SISO] = "siso",
3999 };
4000
4001 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4002 ss_force_name[lq_sta->pers.ss_force]);
4003 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4004}
4005
4006static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4007 size_t count, loff_t *ppos)
4008{
4009 struct iwl_mvm *mvm = lq_sta->pers.drv;
4010 int ret = 0;
4011
4012 if (!strncmp("none", buf, 4)) {
4013 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4014 } else if (!strncmp("siso", buf, 4)) {
4015 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4016 } else if (!strncmp("stbc", buf, 4)) {
4017 if (lq_sta->stbc_capable) {
4018 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4019 } else {
4020 IWL_ERR(mvm,
4021 "can't force STBC. peer doesn't support\n");
4022 ret = -EINVAL;
4023 }
4024 } else if (!strncmp("bfer", buf, 4)) {
4025 if (lq_sta->bfer_capable) {
4026 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4027 } else {
4028 IWL_ERR(mvm,
4029 "can't force BFER. peer doesn't support\n");
4030 ret = -EINVAL;
4031 }
4032 } else {
4033 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4034 ret = -EINVAL;
4035 }
4036 return ret ?: count;
4037}
4038
4039#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4040 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4041#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
4042 debugfs_create_file(#name, mode, parent, lq_sta, \
4043 &iwl_dbgfs_##name##_ops); \
4044 } while (0)
4045
4046MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4047
4048static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4049 struct dentry *dir)
4050{
4051 struct iwl_lq_sta *lq_sta = priv_sta;
4052 struct iwl_mvm_sta *mvmsta;
4053
4054 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4055
4056 if (!mvmsta->vif)
4057 return;
4058
4059 debugfs_create_file("rate_scale_table", 0600, dir,
4060 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4061 debugfs_create_file("rate_stats_table", 0400, dir,
4062 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4063 debugfs_create_file("drv_tx_stats", 0600, dir,
4064 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4065 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4066 &lq_sta->tx_agg_tid_en);
4067 debugfs_create_u8("reduced_tpc", 0600, dir,
4068 &lq_sta->pers.dbg_fixed_txp_reduction);
4069
4070 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4071}
4072#endif
4073
4074/*
4075 * Initialization of rate scaling information is done by driver after
4076 * the station is added. Since mac80211 calls this function before a
4077 * station is added we ignore it.
4078 */
4079static void rs_rate_init_ops(void *mvm_r,
4080 struct ieee80211_supported_band *sband,
4081 struct cfg80211_chan_def *chandef,
4082 struct ieee80211_sta *sta, void *mvm_sta)
4083{
4084}
4085
4086/* ops for rate scaling implemented in the driver */
4087static const struct rate_control_ops rs_mvm_ops_drv = {
4088 .name = RS_NAME,
4089 .tx_status = rs_drv_mac80211_tx_status,
4090 .get_rate = rs_drv_get_rate,
4091 .rate_init = rs_rate_init_ops,
4092 .alloc = rs_alloc,
4093 .free = rs_free,
4094 .alloc_sta = rs_drv_alloc_sta,
4095 .free_sta = rs_free_sta,
4096 .rate_update = rs_drv_rate_update,
4097#ifdef CONFIG_MAC80211_DEBUGFS
4098 .add_sta_debugfs = rs_drv_add_sta_debugfs,
4099#endif
4100 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4101};
4102
4103void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4104 enum nl80211_band band, bool update)
4105{
4106 if (iwl_mvm_has_tlc_offload(mvm)) {
4107 rs_fw_rate_init(mvm, sta, band, update);
4108 } else {
4109 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4110
4111 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock);
4112 rs_drv_rate_init(mvm, sta, band);
4113 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
4114 }
4115}
4116
4117int iwl_mvm_rate_control_register(void)
4118{
4119 return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4120}
4121
4122void iwl_mvm_rate_control_unregister(void)
4123{
4124 ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4125}
4126
4127static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4128 bool enable)
4129{
4130 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4131
4132 lockdep_assert_held(&mvm->mutex);
4133
4134 if (enable) {
4135 if (mvmsta->tx_protection == 0)
4136 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4137 mvmsta->tx_protection++;
4138 } else {
4139 mvmsta->tx_protection--;
4140 if (mvmsta->tx_protection == 0)
4141 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4142 }
4143
4144 return iwl_mvm_send_lq_cmd(mvm, lq);
4145}
4146
4147/**
4148 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4149 * @mvm: The mvm component
4150 * @mvmsta: The station
4151 * @enable: Enable Tx protection?
4152 */
4153int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4154 bool enable)
4155{
4156 if (iwl_mvm_has_tlc_offload(mvm))
4157 return rs_fw_tx_protection(mvm, mvmsta, enable);
4158 else
4159 return rs_drv_tx_protection(mvm, mvmsta, enable);
4160}