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1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3 *
4 * Copyright(c) 2005 - 2014, 2018 - 2023 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 = NULL;
516
517 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
518 iwl_rs_pretty_ant(rate->ant), rate_str ?: "BAD_RATE");
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->deflink.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 = FIELD_GET(RATE_MCS_NSS_MSK, ucode_rate) + 1;
899
900 if (nss == 1) {
901 rate->type = LQ_VHT_SISO;
902 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
903 "stbc %d bfer %d",
904 rate->stbc, rate->bfer);
905 } else if (nss == 2) {
906 rate->type = LQ_VHT_MIMO2;
907 WARN_ON_ONCE(num_of_ant != 2);
908 } else {
909 WARN_ON_ONCE(1);
910 }
911 } else if (ucode_rate & RATE_MCS_HE_MSK_V1) {
912 nss = FIELD_GET(RATE_MCS_NSS_MSK, ucode_rate) + 1;
913
914 if (nss == 1) {
915 rate->type = LQ_HE_SISO;
916 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
917 "stbc %d bfer %d", rate->stbc, rate->bfer);
918 } else if (nss == 2) {
919 rate->type = LQ_HE_MIMO2;
920 WARN_ON_ONCE(num_of_ant != 2);
921 } else {
922 WARN_ON_ONCE(1);
923 }
924 }
925
926 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
927 !is_he(rate) && !is_vht(rate));
928
929 return 0;
930}
931
932/* switch to another antenna/antennas and return 1 */
933/* if no other valid antenna found, return 0 */
934static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
935{
936 u8 new_ant_type;
937
938 if (!rs_is_valid_ant(valid_ant, rate->ant))
939 return 0;
940
941 new_ant_type = ant_toggle_lookup[rate->ant];
942
943 while ((new_ant_type != rate->ant) &&
944 !rs_is_valid_ant(valid_ant, new_ant_type))
945 new_ant_type = ant_toggle_lookup[new_ant_type];
946
947 if (new_ant_type == rate->ant)
948 return 0;
949
950 rate->ant = new_ant_type;
951
952 return 1;
953}
954
955static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
956 struct rs_rate *rate)
957{
958 if (is_legacy(rate))
959 return lq_sta->active_legacy_rate;
960 else if (is_siso(rate))
961 return lq_sta->active_siso_rate;
962 else if (is_mimo2(rate))
963 return lq_sta->active_mimo2_rate;
964
965 WARN_ON_ONCE(1);
966 return 0;
967}
968
969static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
970 int rate_type)
971{
972 u8 high = IWL_RATE_INVALID;
973 u8 low = IWL_RATE_INVALID;
974
975 /* 802.11A or ht walks to the next literal adjacent rate in
976 * the rate table */
977 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
978 int i;
979 u32 mask;
980
981 /* Find the previous rate that is in the rate mask */
982 i = index - 1;
983 if (i >= 0)
984 mask = BIT(i);
985 for (; i >= 0; i--, mask >>= 1) {
986 if (rate_mask & mask) {
987 low = i;
988 break;
989 }
990 }
991
992 /* Find the next rate that is in the rate mask */
993 i = index + 1;
994 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
995 if (rate_mask & mask) {
996 high = i;
997 break;
998 }
999 }
1000
1001 return (high << 8) | low;
1002 }
1003
1004 low = index;
1005 while (low != IWL_RATE_INVALID) {
1006 low = iwl_rates[low].prev_rs;
1007 if (low == IWL_RATE_INVALID)
1008 break;
1009 if (rate_mask & (1 << low))
1010 break;
1011 }
1012
1013 high = index;
1014 while (high != IWL_RATE_INVALID) {
1015 high = iwl_rates[high].next_rs;
1016 if (high == IWL_RATE_INVALID)
1017 break;
1018 if (rate_mask & (1 << high))
1019 break;
1020 }
1021
1022 return (high << 8) | low;
1023}
1024
1025static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1026 struct rs_rate *rate)
1027{
1028 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1029}
1030
1031/* Get the next supported lower rate in the current column.
1032 * Return true if bottom rate in the current column was reached
1033 */
1034static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1035 struct rs_rate *rate)
1036{
1037 u8 low;
1038 u16 high_low;
1039 u16 rate_mask;
1040 struct iwl_mvm *mvm = lq_sta->pers.drv;
1041
1042 rate_mask = rs_get_supported_rates(lq_sta, rate);
1043 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1044 rate->type);
1045 low = high_low & 0xff;
1046
1047 /* Bottom rate of column reached */
1048 if (low == IWL_RATE_INVALID)
1049 return true;
1050
1051 rate->index = low;
1052 return false;
1053}
1054
1055/* Get the next rate to use following a column downgrade */
1056static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1057 struct rs_rate *rate)
1058{
1059 struct iwl_mvm *mvm = lq_sta->pers.drv;
1060
1061 if (is_legacy(rate)) {
1062 /* No column to downgrade from Legacy */
1063 return;
1064 } else if (is_siso(rate)) {
1065 /* Downgrade to Legacy if we were in SISO */
1066 if (lq_sta->band == NL80211_BAND_5GHZ)
1067 rate->type = LQ_LEGACY_A;
1068 else
1069 rate->type = LQ_LEGACY_G;
1070
1071 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1072
1073 if (WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX))
1074 rate->index = rs_ht_to_legacy[IWL_RATE_MCS_0_INDEX];
1075 else if (WARN_ON_ONCE(rate->index > IWL_RATE_MCS_9_INDEX))
1076 rate->index = rs_ht_to_legacy[IWL_RATE_MCS_9_INDEX];
1077 else
1078 rate->index = rs_ht_to_legacy[rate->index];
1079
1080 rate->ldpc = false;
1081 } else {
1082 /* Downgrade to SISO with same MCS if in MIMO */
1083 rate->type = is_vht_mimo2(rate) ?
1084 LQ_VHT_SISO : LQ_HT_SISO;
1085 }
1086
1087 if (num_of_ant(rate->ant) > 1)
1088 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1089
1090 /* Relevant in both switching to SISO or Legacy */
1091 rate->sgi = false;
1092
1093 if (!rs_rate_supported(lq_sta, rate))
1094 rs_get_lower_rate_in_column(lq_sta, rate);
1095}
1096
1097/* Check if both rates share the same column */
1098static inline bool rs_rate_column_match(struct rs_rate *a,
1099 struct rs_rate *b)
1100{
1101 bool ant_match;
1102
1103 if (a->stbc || a->bfer)
1104 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1105 else
1106 ant_match = (a->ant == b->ant);
1107
1108 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1109 && ant_match;
1110}
1111
1112static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1113{
1114 if (is_legacy(rate)) {
1115 if (rate->ant == ANT_A)
1116 return RS_COLUMN_LEGACY_ANT_A;
1117
1118 if (rate->ant == ANT_B)
1119 return RS_COLUMN_LEGACY_ANT_B;
1120
1121 goto err;
1122 }
1123
1124 if (is_siso(rate)) {
1125 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1126 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1127 RS_COLUMN_SISO_ANT_A;
1128
1129 if (rate->ant == ANT_B)
1130 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1131 RS_COLUMN_SISO_ANT_B;
1132
1133 goto err;
1134 }
1135
1136 if (is_mimo(rate))
1137 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1138
1139err:
1140 return RS_COLUMN_INVALID;
1141}
1142
1143static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1144{
1145 u8 tid = IWL_MAX_TID_COUNT;
1146
1147 if (ieee80211_is_data_qos(hdr->frame_control)) {
1148 u8 *qc = ieee80211_get_qos_ctl(hdr);
1149 tid = qc[0] & 0xf;
1150 }
1151
1152 if (unlikely(tid > IWL_MAX_TID_COUNT))
1153 tid = IWL_MAX_TID_COUNT;
1154
1155 return tid;
1156}
1157
1158/*
1159 * mac80211 sends us Tx status
1160 */
1161static void rs_drv_mac80211_tx_status(void *mvm_r,
1162 struct ieee80211_supported_band *sband,
1163 struct ieee80211_sta *sta, void *priv_sta,
1164 struct sk_buff *skb)
1165{
1166 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1167 struct iwl_op_mode *op_mode = mvm_r;
1168 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1169 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1170 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1171
1172 if (!mvmsta->vif)
1173 return;
1174
1175 if (!ieee80211_is_data(hdr->frame_control) ||
1176 info->flags & IEEE80211_TX_CTL_NO_ACK)
1177 return;
1178
1179 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1180 ieee80211_is_qos_nullfunc(hdr->frame_control));
1181}
1182
1183/*
1184 * Begin a period of staying with a selected modulation mode.
1185 * Set "stay_in_tbl" flag to prevent any mode switches.
1186 * Set frame tx success limits according to legacy vs. high-throughput,
1187 * and reset overall (spanning all rates) tx success history statistics.
1188 * These control how long we stay using same modulation mode before
1189 * searching for a new mode.
1190 */
1191static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1192 struct iwl_lq_sta *lq_sta)
1193{
1194 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1195 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1196 if (is_legacy) {
1197 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1198 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1199 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1200 } else {
1201 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1202 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1203 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1204 }
1205 lq_sta->table_count = 0;
1206 lq_sta->total_failed = 0;
1207 lq_sta->total_success = 0;
1208 lq_sta->flush_timer = jiffies;
1209 lq_sta->visited_columns = 0;
1210}
1211
1212static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1213{
1214 if (rate_mask)
1215 return find_last_bit(&rate_mask, BITS_PER_LONG);
1216 return IWL_RATE_INVALID;
1217}
1218
1219static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1220 const struct rs_tx_column *column)
1221{
1222 switch (column->mode) {
1223 case RS_LEGACY:
1224 return lq_sta->max_legacy_rate_idx;
1225 case RS_SISO:
1226 return lq_sta->max_siso_rate_idx;
1227 case RS_MIMO2:
1228 return lq_sta->max_mimo2_rate_idx;
1229 default:
1230 WARN_ON_ONCE(1);
1231 }
1232
1233 return lq_sta->max_legacy_rate_idx;
1234}
1235
1236static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1237 const struct rs_tx_column *column,
1238 u32 bw)
1239{
1240 /* Used to choose among HT tables */
1241 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1242
1243 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1244 column->mode != RS_SISO &&
1245 column->mode != RS_MIMO2))
1246 return expected_tpt_legacy;
1247
1248 /* Legacy rates have only one table */
1249 if (column->mode == RS_LEGACY)
1250 return expected_tpt_legacy;
1251
1252 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1253 /* Choose among many HT tables depending on number of streams
1254 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1255 * status */
1256 if (column->mode == RS_SISO) {
1257 switch (bw) {
1258 case RATE_MCS_CHAN_WIDTH_20:
1259 ht_tbl_pointer = expected_tpt_siso_20MHz;
1260 break;
1261 case RATE_MCS_CHAN_WIDTH_40:
1262 ht_tbl_pointer = expected_tpt_siso_40MHz;
1263 break;
1264 case RATE_MCS_CHAN_WIDTH_80:
1265 ht_tbl_pointer = expected_tpt_siso_80MHz;
1266 break;
1267 case RATE_MCS_CHAN_WIDTH_160:
1268 ht_tbl_pointer = expected_tpt_siso_160MHz;
1269 break;
1270 default:
1271 WARN_ON_ONCE(1);
1272 }
1273 } else if (column->mode == RS_MIMO2) {
1274 switch (bw) {
1275 case RATE_MCS_CHAN_WIDTH_20:
1276 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1277 break;
1278 case RATE_MCS_CHAN_WIDTH_40:
1279 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1280 break;
1281 case RATE_MCS_CHAN_WIDTH_80:
1282 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1283 break;
1284 case RATE_MCS_CHAN_WIDTH_160:
1285 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1286 break;
1287 default:
1288 WARN_ON_ONCE(1);
1289 }
1290 } else {
1291 WARN_ON_ONCE(1);
1292 }
1293
1294 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1295 return ht_tbl_pointer[0];
1296 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1297 return ht_tbl_pointer[1];
1298 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1299 return ht_tbl_pointer[2];
1300 else /* AGG+SGI */
1301 return ht_tbl_pointer[3];
1302}
1303
1304static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1305 struct iwl_scale_tbl_info *tbl)
1306{
1307 struct rs_rate *rate = &tbl->rate;
1308 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1309
1310 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1311}
1312
1313/* rs uses two tables, one is active and the second is for searching better
1314 * configuration. This function, according to the index of the currently
1315 * active table returns the search table, which is located at the
1316 * index complementary to 1 according to the active table (active = 1,
1317 * search = 0 or active = 0, search = 1).
1318 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1319 */
1320static inline u8 rs_search_tbl(u8 active_tbl)
1321{
1322 return (active_tbl ^ 1) & 1;
1323}
1324
1325static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1326 struct iwl_lq_sta *lq_sta,
1327 struct iwl_scale_tbl_info *tbl, /* "search" */
1328 unsigned long rate_mask, s8 index)
1329{
1330 struct iwl_scale_tbl_info *active_tbl =
1331 &(lq_sta->lq_info[lq_sta->active_tbl]);
1332 s32 success_ratio = active_tbl->win[index].success_ratio;
1333 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1334 const u16 *tpt_tbl = tbl->expected_tpt;
1335 u16 high_low;
1336 u32 target_tpt;
1337 int rate_idx;
1338
1339 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1340 target_tpt = 100 * expected_current_tpt;
1341 IWL_DEBUG_RATE(mvm,
1342 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1343 success_ratio, target_tpt);
1344 } else {
1345 target_tpt = lq_sta->last_tpt;
1346 IWL_DEBUG_RATE(mvm,
1347 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1348 success_ratio, target_tpt);
1349 }
1350
1351 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1352
1353 while (rate_idx != IWL_RATE_INVALID) {
1354 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1355 break;
1356
1357 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1358 tbl->rate.type);
1359
1360 rate_idx = (high_low >> 8) & 0xff;
1361 }
1362
1363 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1364 rate_idx, target_tpt,
1365 rate_idx != IWL_RATE_INVALID ?
1366 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1367
1368 return rate_idx;
1369}
1370
1371static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1372{
1373 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->deflink.vht_cap;
1374 struct ieee80211_vht_cap vht_cap = {
1375 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1376 .supp_mcs = sta_vht_cap->vht_mcs,
1377 };
1378
1379 switch (sta->deflink.bandwidth) {
1380 case IEEE80211_STA_RX_BW_160:
1381 /*
1382 * Don't use 160 MHz if VHT extended NSS support
1383 * says we cannot use 2 streams, we don't want to
1384 * deal with this.
1385 * We only check MCS 0 - they will support that if
1386 * we got here at all and we don't care which MCS,
1387 * we want to determine a more global state.
1388 */
1389 if (ieee80211_get_vht_max_nss(&vht_cap,
1390 IEEE80211_VHT_CHANWIDTH_160MHZ,
1391 0, true,
1392 sta->deflink.rx_nss) < sta->deflink.rx_nss)
1393 return RATE_MCS_CHAN_WIDTH_80;
1394 return RATE_MCS_CHAN_WIDTH_160;
1395 case IEEE80211_STA_RX_BW_80:
1396 return RATE_MCS_CHAN_WIDTH_80;
1397 case IEEE80211_STA_RX_BW_40:
1398 return RATE_MCS_CHAN_WIDTH_40;
1399 case IEEE80211_STA_RX_BW_20:
1400 default:
1401 return RATE_MCS_CHAN_WIDTH_20;
1402 }
1403}
1404
1405/*
1406 * Check whether we should continue using same modulation mode, or
1407 * begin search for a new mode, based on:
1408 * 1) # tx successes or failures while using this mode
1409 * 2) # times calling this function
1410 * 3) elapsed time in this mode (not used, for now)
1411 */
1412static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1413{
1414 struct iwl_scale_tbl_info *tbl;
1415 int active_tbl;
1416 int flush_interval_passed = 0;
1417 struct iwl_mvm *mvm;
1418
1419 mvm = lq_sta->pers.drv;
1420 active_tbl = lq_sta->active_tbl;
1421
1422 tbl = &(lq_sta->lq_info[active_tbl]);
1423
1424 /* If we've been disallowing search, see if we should now allow it */
1425 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1426 /* Elapsed time using current modulation mode */
1427 if (lq_sta->flush_timer)
1428 flush_interval_passed =
1429 time_after(jiffies,
1430 (unsigned long)(lq_sta->flush_timer +
1431 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1432
1433 /*
1434 * Check if we should allow search for new modulation mode.
1435 * If many frames have failed or succeeded, or we've used
1436 * this same modulation for a long time, allow search, and
1437 * reset history stats that keep track of whether we should
1438 * allow a new search. Also (below) reset all bitmaps and
1439 * stats in active history.
1440 */
1441 if (force_search ||
1442 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1443 (lq_sta->total_success > lq_sta->max_success_limit) ||
1444 ((!lq_sta->search_better_tbl) &&
1445 (lq_sta->flush_timer) && (flush_interval_passed))) {
1446 IWL_DEBUG_RATE(mvm,
1447 "LQ: stay is expired %d %d %d\n",
1448 lq_sta->total_failed,
1449 lq_sta->total_success,
1450 flush_interval_passed);
1451
1452 /* Allow search for new mode */
1453 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1454 IWL_DEBUG_RATE(mvm,
1455 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1456 lq_sta->total_failed = 0;
1457 lq_sta->total_success = 0;
1458 lq_sta->flush_timer = 0;
1459 /* mark the current column as visited */
1460 lq_sta->visited_columns = BIT(tbl->column);
1461 /*
1462 * Else if we've used this modulation mode enough repetitions
1463 * (regardless of elapsed time or success/failure), reset
1464 * history bitmaps and rate-specific stats for all rates in
1465 * active table.
1466 */
1467 } else {
1468 lq_sta->table_count++;
1469 if (lq_sta->table_count >=
1470 lq_sta->table_count_limit) {
1471 lq_sta->table_count = 0;
1472
1473 IWL_DEBUG_RATE(mvm,
1474 "LQ: stay in table clear win\n");
1475 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1476 }
1477 }
1478
1479 /* If transitioning to allow "search", reset all history
1480 * bitmaps and stats in active table (this will become the new
1481 * "search" table). */
1482 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1483 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1484 }
1485 }
1486}
1487
1488static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1489 struct iwl_scale_tbl_info *tbl,
1490 enum rs_action scale_action)
1491{
1492 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1493 struct ieee80211_bss_conf *bss_conf = &mvmsta->vif->bss_conf;
1494 int i;
1495
1496 sta->deflink.agg.max_amsdu_len =
1497 rs_fw_get_max_amsdu_len(sta, bss_conf, &sta->deflink);
1498
1499 /*
1500 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1501 * or 0, since there is no per-TID alg.
1502 */
1503 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1504 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1505 scale_action == RS_ACTION_DOWNSCALE)
1506 mvmsta->amsdu_enabled = 0;
1507 else
1508 mvmsta->amsdu_enabled = 0xFFFF;
1509
1510 if (bss_conf->he_support &&
1511 !iwlwifi_mod_params.disable_11ax)
1512 mvmsta->max_amsdu_len = sta->deflink.agg.max_amsdu_len;
1513 else
1514 mvmsta->max_amsdu_len =
1515 min_t(int, sta->deflink.agg.max_amsdu_len, 8500);
1516
1517 sta->deflink.agg.max_rc_amsdu_len = mvmsta->max_amsdu_len;
1518
1519 for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1520 if (mvmsta->amsdu_enabled)
1521 sta->deflink.agg.max_tid_amsdu_len[i] =
1522 iwl_mvm_max_amsdu_size(mvm, sta, i);
1523 else
1524 /*
1525 * Not so elegant, but this will effectively
1526 * prevent AMSDU on this TID
1527 */
1528 sta->deflink.agg.max_tid_amsdu_len[i] = 1;
1529 }
1530}
1531
1532/*
1533 * setup rate table in uCode
1534 */
1535static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1536 struct ieee80211_sta *sta,
1537 struct iwl_lq_sta *lq_sta,
1538 struct iwl_scale_tbl_info *tbl)
1539{
1540 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1541 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1542}
1543
1544static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1545 struct ieee80211_sta *sta,
1546 struct iwl_lq_sta *lq_sta,
1547 struct iwl_scale_tbl_info *tbl,
1548 enum rs_action scale_action)
1549{
1550 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1551 return false;
1552
1553 if (!is_vht_siso(&tbl->rate))
1554 return false;
1555
1556 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1557 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1558 (scale_action == RS_ACTION_DOWNSCALE)) {
1559 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1560 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1561 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1562 goto tweaked;
1563 }
1564
1565 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1566 * sustainable, i.e. we're past the test window. We can't go back
1567 * if MCS5 is just tested as this will happen always after switching
1568 * to 20Mhz MCS4 because the rate stats are cleared.
1569 */
1570 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1571 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1572 (scale_action == RS_ACTION_STAY)) ||
1573 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1574 (scale_action == RS_ACTION_UPSCALE)))) {
1575 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1576 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1577 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1578 goto tweaked;
1579 }
1580
1581 return false;
1582
1583tweaked:
1584 rs_set_expected_tpt_table(lq_sta, tbl);
1585 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1586 return true;
1587}
1588
1589static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1590 struct iwl_lq_sta *lq_sta,
1591 struct ieee80211_sta *sta,
1592 struct iwl_scale_tbl_info *tbl)
1593{
1594 int i, j, max_rate;
1595 enum rs_column next_col_id;
1596 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1597 const struct rs_tx_column *next_col;
1598 allow_column_func_t allow_func;
1599 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1600 const u16 *expected_tpt_tbl;
1601 u16 tpt, max_expected_tpt;
1602
1603 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1604 next_col_id = curr_col->next_columns[i];
1605
1606 if (next_col_id == RS_COLUMN_INVALID)
1607 continue;
1608
1609 if (lq_sta->visited_columns & BIT(next_col_id)) {
1610 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1611 next_col_id);
1612 continue;
1613 }
1614
1615 next_col = &rs_tx_columns[next_col_id];
1616
1617 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1618 IWL_DEBUG_RATE(mvm,
1619 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1620 next_col_id, valid_ants, next_col->ant);
1621 continue;
1622 }
1623
1624 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1625 allow_func = next_col->checks[j];
1626 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1627 next_col))
1628 break;
1629 }
1630
1631 if (j != MAX_COLUMN_CHECKS) {
1632 IWL_DEBUG_RATE(mvm,
1633 "Skip column %d: not allowed (check %d failed)\n",
1634 next_col_id, j);
1635
1636 continue;
1637 }
1638
1639 tpt = lq_sta->last_tpt / 100;
1640 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1641 rs_bw_from_sta_bw(sta));
1642 if (WARN_ON_ONCE(!expected_tpt_tbl))
1643 continue;
1644
1645 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1646 if (max_rate == IWL_RATE_INVALID) {
1647 IWL_DEBUG_RATE(mvm,
1648 "Skip column %d: no rate is allowed in this column\n",
1649 next_col_id);
1650 continue;
1651 }
1652
1653 max_expected_tpt = expected_tpt_tbl[max_rate];
1654 if (tpt >= max_expected_tpt) {
1655 IWL_DEBUG_RATE(mvm,
1656 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1657 next_col_id, max_expected_tpt, tpt);
1658 continue;
1659 }
1660
1661 IWL_DEBUG_RATE(mvm,
1662 "Found potential column %d. Max expected %d current %d\n",
1663 next_col_id, max_expected_tpt, tpt);
1664 break;
1665 }
1666
1667 if (i == MAX_NEXT_COLUMNS)
1668 return RS_COLUMN_INVALID;
1669
1670 return next_col_id;
1671}
1672
1673static int rs_switch_to_column(struct iwl_mvm *mvm,
1674 struct iwl_lq_sta *lq_sta,
1675 struct ieee80211_sta *sta,
1676 enum rs_column col_id)
1677{
1678 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1679 struct iwl_scale_tbl_info *search_tbl =
1680 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1681 struct rs_rate *rate = &search_tbl->rate;
1682 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1683 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1684 unsigned long rate_mask = 0;
1685 u32 rate_idx = 0;
1686
1687 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1688
1689 rate->sgi = column->sgi;
1690 rate->ant = column->ant;
1691
1692 if (column->mode == RS_LEGACY) {
1693 if (lq_sta->band == NL80211_BAND_5GHZ)
1694 rate->type = LQ_LEGACY_A;
1695 else
1696 rate->type = LQ_LEGACY_G;
1697
1698 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1699 rate->ldpc = false;
1700 rate_mask = lq_sta->active_legacy_rate;
1701 } else if (column->mode == RS_SISO) {
1702 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1703 rate_mask = lq_sta->active_siso_rate;
1704 } else if (column->mode == RS_MIMO2) {
1705 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1706 rate_mask = lq_sta->active_mimo2_rate;
1707 } else {
1708 WARN_ONCE(1, "Bad column mode");
1709 }
1710
1711 if (column->mode != RS_LEGACY) {
1712 rate->bw = rs_bw_from_sta_bw(sta);
1713 rate->ldpc = lq_sta->ldpc;
1714 }
1715
1716 search_tbl->column = col_id;
1717 rs_set_expected_tpt_table(lq_sta, search_tbl);
1718
1719 lq_sta->visited_columns |= BIT(col_id);
1720
1721 /* Get the best matching rate if we're changing modes. e.g.
1722 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1723 */
1724 if (curr_column->mode != column->mode) {
1725 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1726 rate_mask, rate->index);
1727
1728 if ((rate_idx == IWL_RATE_INVALID) ||
1729 !(BIT(rate_idx) & rate_mask)) {
1730 IWL_DEBUG_RATE(mvm,
1731 "can not switch with index %d"
1732 " rate mask %lx\n",
1733 rate_idx, rate_mask);
1734
1735 goto err;
1736 }
1737
1738 rate->index = rate_idx;
1739 }
1740
1741 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1742 col_id, rate->index);
1743
1744 return 0;
1745
1746err:
1747 rate->type = LQ_NONE;
1748 return -1;
1749}
1750
1751static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1752 struct iwl_scale_tbl_info *tbl,
1753 s32 sr, int low, int high,
1754 int current_tpt,
1755 int low_tpt, int high_tpt)
1756{
1757 enum rs_action action = RS_ACTION_STAY;
1758
1759 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1760 (current_tpt == 0)) {
1761 IWL_DEBUG_RATE(mvm,
1762 "Decrease rate because of low SR\n");
1763 return RS_ACTION_DOWNSCALE;
1764 }
1765
1766 if ((low_tpt == IWL_INVALID_VALUE) &&
1767 (high_tpt == IWL_INVALID_VALUE) &&
1768 (high != IWL_RATE_INVALID)) {
1769 IWL_DEBUG_RATE(mvm,
1770 "No data about high/low rates. Increase rate\n");
1771 return RS_ACTION_UPSCALE;
1772 }
1773
1774 if ((high_tpt == IWL_INVALID_VALUE) &&
1775 (high != IWL_RATE_INVALID) &&
1776 (low_tpt != IWL_INVALID_VALUE) &&
1777 (low_tpt < current_tpt)) {
1778 IWL_DEBUG_RATE(mvm,
1779 "No data about high rate and low rate is worse. Increase rate\n");
1780 return RS_ACTION_UPSCALE;
1781 }
1782
1783 if ((high_tpt != IWL_INVALID_VALUE) &&
1784 (high_tpt > current_tpt)) {
1785 IWL_DEBUG_RATE(mvm,
1786 "Higher rate is better. Increate rate\n");
1787 return RS_ACTION_UPSCALE;
1788 }
1789
1790 if ((low_tpt != IWL_INVALID_VALUE) &&
1791 (high_tpt != IWL_INVALID_VALUE) &&
1792 (low_tpt < current_tpt) &&
1793 (high_tpt < current_tpt)) {
1794 IWL_DEBUG_RATE(mvm,
1795 "Both high and low are worse. Maintain rate\n");
1796 return RS_ACTION_STAY;
1797 }
1798
1799 if ((low_tpt != IWL_INVALID_VALUE) &&
1800 (low_tpt > current_tpt)) {
1801 IWL_DEBUG_RATE(mvm,
1802 "Lower rate is better\n");
1803 action = RS_ACTION_DOWNSCALE;
1804 goto out;
1805 }
1806
1807 if ((low_tpt == IWL_INVALID_VALUE) &&
1808 (low != IWL_RATE_INVALID)) {
1809 IWL_DEBUG_RATE(mvm,
1810 "No data about lower rate\n");
1811 action = RS_ACTION_DOWNSCALE;
1812 goto out;
1813 }
1814
1815 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1816
1817out:
1818 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1819 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1820 IWL_DEBUG_RATE(mvm,
1821 "SR is above NO DECREASE. Avoid downscale\n");
1822 action = RS_ACTION_STAY;
1823 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1824 IWL_DEBUG_RATE(mvm,
1825 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1826 action = RS_ACTION_STAY;
1827 } else {
1828 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1829 }
1830 }
1831
1832 return action;
1833}
1834
1835static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1836 struct iwl_lq_sta *lq_sta)
1837{
1838 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1839 * supports STBC of at least 1*SS
1840 */
1841 if (!lq_sta->stbc_capable)
1842 return false;
1843
1844 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1845 return false;
1846
1847 return true;
1848}
1849
1850static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1851 int *weaker, int *stronger)
1852{
1853 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1854 if (*weaker > TPC_MAX_REDUCTION)
1855 *weaker = TPC_INVALID;
1856
1857 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1858 if (*stronger < 0)
1859 *stronger = TPC_INVALID;
1860}
1861
1862static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1863 struct rs_rate *rate, enum nl80211_band band)
1864{
1865 int index = rate->index;
1866 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1867 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1868 !vif->cfg.ps);
1869
1870 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1871 cam, sta_ps_disabled);
1872 /*
1873 * allow tpc only if power management is enabled, or bt coex
1874 * activity grade allows it and we are on 2.4Ghz.
1875 */
1876 if ((cam || sta_ps_disabled) &&
1877 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1878 return false;
1879
1880 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1881 if (is_legacy(rate))
1882 return index == IWL_RATE_54M_INDEX;
1883 if (is_ht(rate))
1884 return index == IWL_RATE_MCS_7_INDEX;
1885 if (is_vht(rate))
1886 return index == IWL_RATE_MCS_9_INDEX;
1887
1888 WARN_ON_ONCE(1);
1889 return false;
1890}
1891
1892enum tpc_action {
1893 TPC_ACTION_STAY,
1894 TPC_ACTION_DECREASE,
1895 TPC_ACTION_INCREASE,
1896 TPC_ACTION_NO_RESTIRCTION,
1897};
1898
1899static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1900 s32 sr, int weak, int strong,
1901 int current_tpt,
1902 int weak_tpt, int strong_tpt)
1903{
1904 /* stay until we have valid tpt */
1905 if (current_tpt == IWL_INVALID_VALUE) {
1906 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1907 return TPC_ACTION_STAY;
1908 }
1909
1910 /* Too many failures, increase txp */
1911 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1912 current_tpt == 0) {
1913 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1914 return TPC_ACTION_NO_RESTIRCTION;
1915 }
1916
1917 /* try decreasing first if applicable */
1918 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1919 weak != TPC_INVALID) {
1920 if (weak_tpt == IWL_INVALID_VALUE &&
1921 (strong_tpt == IWL_INVALID_VALUE ||
1922 current_tpt >= strong_tpt)) {
1923 IWL_DEBUG_RATE(mvm,
1924 "no weak txp measurement. decrease txp\n");
1925 return TPC_ACTION_DECREASE;
1926 }
1927
1928 if (weak_tpt > current_tpt) {
1929 IWL_DEBUG_RATE(mvm,
1930 "lower txp has better tpt. decrease txp\n");
1931 return TPC_ACTION_DECREASE;
1932 }
1933 }
1934
1935 /* next, increase if needed */
1936 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1937 strong != TPC_INVALID) {
1938 if (weak_tpt == IWL_INVALID_VALUE &&
1939 strong_tpt != IWL_INVALID_VALUE &&
1940 current_tpt < strong_tpt) {
1941 IWL_DEBUG_RATE(mvm,
1942 "higher txp has better tpt. increase txp\n");
1943 return TPC_ACTION_INCREASE;
1944 }
1945
1946 if (weak_tpt < current_tpt &&
1947 (strong_tpt == IWL_INVALID_VALUE ||
1948 strong_tpt > current_tpt)) {
1949 IWL_DEBUG_RATE(mvm,
1950 "lower txp has worse tpt. increase txp\n");
1951 return TPC_ACTION_INCREASE;
1952 }
1953 }
1954
1955 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1956 return TPC_ACTION_STAY;
1957}
1958
1959static bool rs_tpc_perform(struct iwl_mvm *mvm,
1960 struct ieee80211_sta *sta,
1961 struct iwl_lq_sta *lq_sta,
1962 struct iwl_scale_tbl_info *tbl)
1963{
1964 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1965 struct ieee80211_vif *vif = mvm_sta->vif;
1966 struct ieee80211_chanctx_conf *chanctx_conf;
1967 enum nl80211_band band;
1968 struct iwl_rate_scale_data *window;
1969 struct rs_rate *rate = &tbl->rate;
1970 enum tpc_action action;
1971 s32 sr;
1972 u8 cur = lq_sta->lq.reduced_tpc;
1973 int current_tpt;
1974 int weak, strong;
1975 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1976
1977#ifdef CONFIG_MAC80211_DEBUGFS
1978 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1979 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1980 lq_sta->pers.dbg_fixed_txp_reduction);
1981 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1982 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1983 }
1984#endif
1985
1986 rcu_read_lock();
1987 chanctx_conf = rcu_dereference(vif->bss_conf.chanctx_conf);
1988 if (WARN_ON(!chanctx_conf))
1989 band = NUM_NL80211_BANDS;
1990 else
1991 band = chanctx_conf->def.chan->band;
1992 rcu_read_unlock();
1993
1994 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1995 IWL_DEBUG_RATE(mvm,
1996 "tpc is not allowed. remove txp restrictions\n");
1997 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1998 return cur != TPC_NO_REDUCTION;
1999 }
2000
2001 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2002
2003 /* Collect measured throughputs for current and adjacent rates */
2004 window = tbl->tpc_win;
2005 sr = window[cur].success_ratio;
2006 current_tpt = window[cur].average_tpt;
2007 if (weak != TPC_INVALID)
2008 weak_tpt = window[weak].average_tpt;
2009 if (strong != TPC_INVALID)
2010 strong_tpt = window[strong].average_tpt;
2011
2012 IWL_DEBUG_RATE(mvm,
2013 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2014 cur, current_tpt, sr, weak, strong,
2015 weak_tpt, strong_tpt);
2016
2017 action = rs_get_tpc_action(mvm, sr, weak, strong,
2018 current_tpt, weak_tpt, strong_tpt);
2019
2020 /* override actions if we are on the edge */
2021 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2022 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2023 action = TPC_ACTION_STAY;
2024 } else if (strong == TPC_INVALID &&
2025 (action == TPC_ACTION_INCREASE ||
2026 action == TPC_ACTION_NO_RESTIRCTION)) {
2027 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2028 action = TPC_ACTION_STAY;
2029 }
2030
2031 switch (action) {
2032 case TPC_ACTION_DECREASE:
2033 lq_sta->lq.reduced_tpc = weak;
2034 return true;
2035 case TPC_ACTION_INCREASE:
2036 lq_sta->lq.reduced_tpc = strong;
2037 return true;
2038 case TPC_ACTION_NO_RESTIRCTION:
2039 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2040 return true;
2041 case TPC_ACTION_STAY:
2042 /* do nothing */
2043 break;
2044 }
2045 return false;
2046}
2047
2048/*
2049 * Do rate scaling and search for new modulation mode.
2050 */
2051static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2052 struct ieee80211_sta *sta,
2053 struct iwl_lq_sta *lq_sta,
2054 int tid, bool ndp)
2055{
2056 int low = IWL_RATE_INVALID;
2057 int high = IWL_RATE_INVALID;
2058 int index;
2059 struct iwl_rate_scale_data *window = NULL;
2060 int current_tpt = IWL_INVALID_VALUE;
2061 int low_tpt = IWL_INVALID_VALUE;
2062 int high_tpt = IWL_INVALID_VALUE;
2063 u32 fail_count;
2064 enum rs_action scale_action = RS_ACTION_STAY;
2065 u16 rate_mask;
2066 u8 update_lq = 0;
2067 struct iwl_scale_tbl_info *tbl, *tbl1;
2068 u8 active_tbl = 0;
2069 u8 done_search = 0;
2070 u16 high_low;
2071 s32 sr;
2072 u8 prev_agg = lq_sta->is_agg;
2073 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2074 struct rs_rate *rate;
2075
2076 lq_sta->is_agg = !!mvmsta->agg_tids;
2077
2078 /*
2079 * Select rate-scale / modulation-mode table to work with in
2080 * the rest of this function: "search" if searching for better
2081 * modulation mode, or "active" if doing rate scaling within a mode.
2082 */
2083 if (!lq_sta->search_better_tbl)
2084 active_tbl = lq_sta->active_tbl;
2085 else
2086 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2087
2088 tbl = &(lq_sta->lq_info[active_tbl]);
2089 rate = &tbl->rate;
2090
2091 if (prev_agg != lq_sta->is_agg) {
2092 IWL_DEBUG_RATE(mvm,
2093 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2094 prev_agg, lq_sta->is_agg);
2095 rs_set_expected_tpt_table(lq_sta, tbl);
2096 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2097 }
2098
2099 /* current tx rate */
2100 index = rate->index;
2101
2102 /* rates available for this association, and for modulation mode */
2103 rate_mask = rs_get_supported_rates(lq_sta, rate);
2104
2105 if (!(BIT(index) & rate_mask)) {
2106 IWL_ERR(mvm, "Current Rate is not valid\n");
2107 if (lq_sta->search_better_tbl) {
2108 /* revert to active table if search table is not valid*/
2109 rate->type = LQ_NONE;
2110 lq_sta->search_better_tbl = 0;
2111 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2112 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2113 }
2114 return;
2115 }
2116
2117 /* Get expected throughput table and history window for current rate */
2118 if (!tbl->expected_tpt) {
2119 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2120 return;
2121 }
2122
2123 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2124 window = &(tbl->win[index]);
2125
2126 /*
2127 * If there is not enough history to calculate actual average
2128 * throughput, keep analyzing results of more tx frames, without
2129 * changing rate or mode (bypass most of the rest of this function).
2130 * Set up new rate table in uCode only if old rate is not supported
2131 * in current association (use new rate found above).
2132 */
2133 fail_count = window->counter - window->success_counter;
2134 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2135 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2136 IWL_DEBUG_RATE(mvm,
2137 "%s: Test Window: succ %d total %d\n",
2138 rs_pretty_rate(rate),
2139 window->success_counter, window->counter);
2140
2141 /* Can't calculate this yet; not enough history */
2142 window->average_tpt = IWL_INVALID_VALUE;
2143
2144 /* Should we stay with this modulation mode,
2145 * or search for a new one? */
2146 rs_stay_in_table(lq_sta, false);
2147
2148 return;
2149 }
2150
2151 /* If we are searching for better modulation mode, check success. */
2152 if (lq_sta->search_better_tbl) {
2153 /* If good success, continue using the "search" mode;
2154 * no need to send new link quality command, since we're
2155 * continuing to use the setup that we've been trying. */
2156 if (window->average_tpt > lq_sta->last_tpt) {
2157 IWL_DEBUG_RATE(mvm,
2158 "SWITCHING TO NEW TABLE SR: %d "
2159 "cur-tpt %d old-tpt %d\n",
2160 window->success_ratio,
2161 window->average_tpt,
2162 lq_sta->last_tpt);
2163
2164 /* Swap tables; "search" becomes "active" */
2165 lq_sta->active_tbl = active_tbl;
2166 current_tpt = window->average_tpt;
2167 /* Else poor success; go back to mode in "active" table */
2168 } else {
2169 IWL_DEBUG_RATE(mvm,
2170 "GOING BACK TO THE OLD TABLE: SR %d "
2171 "cur-tpt %d old-tpt %d\n",
2172 window->success_ratio,
2173 window->average_tpt,
2174 lq_sta->last_tpt);
2175
2176 /* Nullify "search" table */
2177 rate->type = LQ_NONE;
2178
2179 /* Revert to "active" table */
2180 active_tbl = lq_sta->active_tbl;
2181 tbl = &(lq_sta->lq_info[active_tbl]);
2182
2183 /* Revert to "active" rate and throughput info */
2184 index = tbl->rate.index;
2185 current_tpt = lq_sta->last_tpt;
2186
2187 /* Need to set up a new rate table in uCode */
2188 update_lq = 1;
2189 }
2190
2191 /* Either way, we've made a decision; modulation mode
2192 * search is done, allow rate adjustment next time. */
2193 lq_sta->search_better_tbl = 0;
2194 done_search = 1; /* Don't switch modes below! */
2195 goto lq_update;
2196 }
2197
2198 /* (Else) not in search of better modulation mode, try for better
2199 * starting rate, while staying in this mode. */
2200 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2201 low = high_low & 0xff;
2202 high = (high_low >> 8) & 0xff;
2203
2204 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2205
2206 sr = window->success_ratio;
2207
2208 /* Collect measured throughputs for current and adjacent rates */
2209 current_tpt = window->average_tpt;
2210 if (low != IWL_RATE_INVALID)
2211 low_tpt = tbl->win[low].average_tpt;
2212 if (high != IWL_RATE_INVALID)
2213 high_tpt = tbl->win[high].average_tpt;
2214
2215 IWL_DEBUG_RATE(mvm,
2216 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2217 rs_pretty_rate(rate), current_tpt, sr,
2218 low, high, low_tpt, high_tpt);
2219
2220 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2221 current_tpt, low_tpt, high_tpt);
2222
2223 /* Force a search in case BT doesn't like us being in MIMO */
2224 if (is_mimo(rate) &&
2225 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2226 IWL_DEBUG_RATE(mvm,
2227 "BT Coex forbids MIMO. Search for new config\n");
2228 rs_stay_in_table(lq_sta, true);
2229 goto lq_update;
2230 }
2231
2232 switch (scale_action) {
2233 case RS_ACTION_DOWNSCALE:
2234 /* Decrease starting rate, update uCode's rate table */
2235 if (low != IWL_RATE_INVALID) {
2236 update_lq = 1;
2237 index = low;
2238 } else {
2239 IWL_DEBUG_RATE(mvm,
2240 "At the bottom rate. Can't decrease\n");
2241 }
2242
2243 break;
2244 case RS_ACTION_UPSCALE:
2245 /* Increase starting rate, update uCode's rate table */
2246 if (high != IWL_RATE_INVALID) {
2247 update_lq = 1;
2248 index = high;
2249 } else {
2250 IWL_DEBUG_RATE(mvm,
2251 "At the top rate. Can't increase\n");
2252 }
2253
2254 break;
2255 case RS_ACTION_STAY:
2256 /* No change */
2257 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2258 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2259 break;
2260 default:
2261 break;
2262 }
2263
2264lq_update:
2265 /* Replace uCode's rate table for the destination station. */
2266 if (update_lq) {
2267 tbl->rate.index = index;
2268 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2269 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2270 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2271 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2272 }
2273
2274 rs_stay_in_table(lq_sta, false);
2275
2276 /*
2277 * Search for new modulation mode if we're:
2278 * 1) Not changing rates right now
2279 * 2) Not just finishing up a search
2280 * 3) Allowing a new search
2281 */
2282 if (!update_lq && !done_search &&
2283 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2284 && window->counter) {
2285 enum rs_column next_column;
2286
2287 /* Save current throughput to compare with "search" throughput*/
2288 lq_sta->last_tpt = current_tpt;
2289
2290 IWL_DEBUG_RATE(mvm,
2291 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2292 update_lq, done_search, lq_sta->rs_state,
2293 window->counter);
2294
2295 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2296 if (next_column != RS_COLUMN_INVALID) {
2297 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2298 next_column);
2299 if (!ret)
2300 lq_sta->search_better_tbl = 1;
2301 } else {
2302 IWL_DEBUG_RATE(mvm,
2303 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2304 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2305 }
2306
2307 /* If new "search" mode was selected, set up in uCode table */
2308 if (lq_sta->search_better_tbl) {
2309 /* Access the "search" table, clear its history. */
2310 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2311 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2312
2313 /* Use new "search" start rate */
2314 index = tbl->rate.index;
2315
2316 rs_dump_rate(mvm, &tbl->rate,
2317 "Switch to SEARCH TABLE:");
2318 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2319 } else {
2320 done_search = 1;
2321 }
2322 }
2323
2324 if (!ndp)
2325 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2326
2327 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2328 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2329 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2330 }
2331}
2332
2333struct rs_init_rate_info {
2334 s8 rssi;
2335 u8 rate_idx;
2336};
2337
2338static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2339 { -60, IWL_RATE_54M_INDEX },
2340 { -64, IWL_RATE_48M_INDEX },
2341 { -68, IWL_RATE_36M_INDEX },
2342 { -80, IWL_RATE_24M_INDEX },
2343 { -84, IWL_RATE_18M_INDEX },
2344 { -85, IWL_RATE_12M_INDEX },
2345 { -86, IWL_RATE_11M_INDEX },
2346 { -88, IWL_RATE_5M_INDEX },
2347 { -90, IWL_RATE_2M_INDEX },
2348 { S8_MIN, IWL_RATE_1M_INDEX },
2349};
2350
2351static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2352 { -60, IWL_RATE_54M_INDEX },
2353 { -64, IWL_RATE_48M_INDEX },
2354 { -72, IWL_RATE_36M_INDEX },
2355 { -80, IWL_RATE_24M_INDEX },
2356 { -84, IWL_RATE_18M_INDEX },
2357 { -85, IWL_RATE_12M_INDEX },
2358 { -87, IWL_RATE_9M_INDEX },
2359 { S8_MIN, IWL_RATE_6M_INDEX },
2360};
2361
2362static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2363 { -60, IWL_RATE_MCS_7_INDEX },
2364 { -64, IWL_RATE_MCS_6_INDEX },
2365 { -68, IWL_RATE_MCS_5_INDEX },
2366 { -72, IWL_RATE_MCS_4_INDEX },
2367 { -80, IWL_RATE_MCS_3_INDEX },
2368 { -84, IWL_RATE_MCS_2_INDEX },
2369 { -85, IWL_RATE_MCS_1_INDEX },
2370 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2371};
2372
2373/* MCS index 9 is not valid for 20MHz VHT channel width,
2374 * but is ok for 40, 80 and 160MHz channels.
2375 */
2376static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2377 { -60, IWL_RATE_MCS_8_INDEX },
2378 { -64, IWL_RATE_MCS_7_INDEX },
2379 { -68, IWL_RATE_MCS_6_INDEX },
2380 { -72, IWL_RATE_MCS_5_INDEX },
2381 { -80, IWL_RATE_MCS_4_INDEX },
2382 { -84, IWL_RATE_MCS_3_INDEX },
2383 { -85, IWL_RATE_MCS_2_INDEX },
2384 { -87, IWL_RATE_MCS_1_INDEX },
2385 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2386};
2387
2388static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2389 { -60, IWL_RATE_MCS_9_INDEX },
2390 { -64, IWL_RATE_MCS_8_INDEX },
2391 { -68, IWL_RATE_MCS_7_INDEX },
2392 { -72, IWL_RATE_MCS_6_INDEX },
2393 { -80, IWL_RATE_MCS_5_INDEX },
2394 { -84, IWL_RATE_MCS_4_INDEX },
2395 { -85, IWL_RATE_MCS_3_INDEX },
2396 { -87, IWL_RATE_MCS_2_INDEX },
2397 { -88, IWL_RATE_MCS_1_INDEX },
2398 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2399};
2400
2401#define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2402
2403/* Init the optimal rate based on STA caps
2404 * This combined with rssi is used to report the last tx rate
2405 * to userspace when we haven't transmitted enough frames.
2406 */
2407static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2408 struct ieee80211_sta *sta,
2409 struct iwl_lq_sta *lq_sta)
2410{
2411 struct rs_rate *rate = &lq_sta->optimal_rate;
2412
2413 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2414 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2415 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2416 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2417 else if (lq_sta->band == NL80211_BAND_5GHZ)
2418 rate->type = LQ_LEGACY_A;
2419 else
2420 rate->type = LQ_LEGACY_G;
2421
2422 rate->bw = rs_bw_from_sta_bw(sta);
2423 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2424
2425 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2426
2427 if (is_mimo(rate)) {
2428 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2429 } else if (is_siso(rate)) {
2430 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2431 } else {
2432 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2433
2434 if (lq_sta->band == NL80211_BAND_5GHZ) {
2435 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2436 lq_sta->optimal_nentries =
2437 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2438 } else {
2439 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2440 lq_sta->optimal_nentries =
2441 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2442 }
2443 }
2444
2445 if (is_vht(rate)) {
2446 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2447 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2448 lq_sta->optimal_nentries =
2449 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2450 } else {
2451 lq_sta->optimal_rates = rs_optimal_rates_vht;
2452 lq_sta->optimal_nentries =
2453 ARRAY_SIZE(rs_optimal_rates_vht);
2454 }
2455 } else if (is_ht(rate)) {
2456 lq_sta->optimal_rates = rs_optimal_rates_ht;
2457 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2458 }
2459}
2460
2461/* Compute the optimal rate index based on RSSI */
2462static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2463 struct iwl_lq_sta *lq_sta)
2464{
2465 struct rs_rate *rate = &lq_sta->optimal_rate;
2466 int i;
2467
2468 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2469 BITS_PER_LONG);
2470
2471 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2472 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2473
2474 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2475 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2476 rate->index = rate_idx;
2477 break;
2478 }
2479 }
2480
2481 return rate;
2482}
2483
2484/* Choose an initial legacy rate and antenna to use based on the RSSI
2485 * of last Rx
2486 */
2487static void rs_get_initial_rate(struct iwl_mvm *mvm,
2488 struct ieee80211_sta *sta,
2489 struct iwl_lq_sta *lq_sta,
2490 enum nl80211_band band,
2491 struct rs_rate *rate)
2492{
2493 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2494 int i, nentries;
2495 unsigned long active_rate;
2496 s8 best_rssi = S8_MIN;
2497 u8 best_ant = ANT_NONE;
2498 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2499 const struct rs_init_rate_info *initial_rates;
2500
2501 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2502 if (!(lq_sta->pers.chains & BIT(i)))
2503 continue;
2504
2505 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2506 best_rssi = lq_sta->pers.chain_signal[i];
2507 best_ant = BIT(i);
2508 }
2509 }
2510
2511 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2512 iwl_rs_pretty_ant(best_ant), best_rssi);
2513
2514 if (best_ant != ANT_A && best_ant != ANT_B)
2515 rate->ant = first_antenna(valid_tx_ant);
2516 else
2517 rate->ant = best_ant;
2518
2519 rate->sgi = false;
2520 rate->ldpc = false;
2521 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2522
2523 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2524 BITS_PER_LONG);
2525
2526 if (band == NL80211_BAND_5GHZ) {
2527 rate->type = LQ_LEGACY_A;
2528 initial_rates = rs_optimal_rates_5ghz_legacy;
2529 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2530 } else {
2531 rate->type = LQ_LEGACY_G;
2532 initial_rates = rs_optimal_rates_24ghz_legacy;
2533 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2534 }
2535
2536 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2537 goto out;
2538
2539 /* Start from a higher rate if the corresponding debug capability
2540 * is enabled. The rate is chosen according to AP capabilities.
2541 * In case of VHT/HT when the rssi is low fallback to the case of
2542 * legacy rates.
2543 */
2544 if (sta->deflink.vht_cap.vht_supported &&
2545 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2546 /*
2547 * In AP mode, when a new station associates, rs is initialized
2548 * immediately upon association completion, before the phy
2549 * context is updated with the association parameters, so the
2550 * sta bandwidth might be wider than the phy context allows.
2551 * To avoid this issue, always initialize rs with 20mhz
2552 * bandwidth rate, and after authorization, when the phy context
2553 * is already up-to-date, re-init rs with the correct bw.
2554 */
2555 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2556 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2557
2558 switch (bw) {
2559 case RATE_MCS_CHAN_WIDTH_40:
2560 case RATE_MCS_CHAN_WIDTH_80:
2561 case RATE_MCS_CHAN_WIDTH_160:
2562 initial_rates = rs_optimal_rates_vht;
2563 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2564 break;
2565 case RATE_MCS_CHAN_WIDTH_20:
2566 initial_rates = rs_optimal_rates_vht_20mhz;
2567 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2568 break;
2569 default:
2570 IWL_ERR(mvm, "Invalid BW %d\n",
2571 sta->deflink.bandwidth);
2572 goto out;
2573 }
2574
2575 active_rate = lq_sta->active_siso_rate;
2576 rate->type = LQ_VHT_SISO;
2577 rate->bw = bw;
2578 } else if (sta->deflink.ht_cap.ht_supported &&
2579 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2580 initial_rates = rs_optimal_rates_ht;
2581 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2582 active_rate = lq_sta->active_siso_rate;
2583 rate->type = LQ_HT_SISO;
2584 } else {
2585 active_rate = lq_sta->active_legacy_rate;
2586 }
2587
2588 for (i = 0; i < nentries; i++) {
2589 int rate_idx = initial_rates[i].rate_idx;
2590
2591 if ((best_rssi >= initial_rates[i].rssi) &&
2592 (BIT(rate_idx) & active_rate)) {
2593 rate->index = rate_idx;
2594 break;
2595 }
2596 }
2597
2598out:
2599 rs_dump_rate(mvm, rate, "INITIAL");
2600}
2601
2602/* Save info about RSSI of last Rx */
2603void rs_update_last_rssi(struct iwl_mvm *mvm,
2604 struct iwl_mvm_sta *mvmsta,
2605 struct ieee80211_rx_status *rx_status)
2606{
2607 struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2608 int i;
2609
2610 lq_sta->pers.chains = rx_status->chains;
2611 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2612 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2613 lq_sta->pers.last_rssi = S8_MIN;
2614
2615 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2616 if (!(lq_sta->pers.chains & BIT(i)))
2617 continue;
2618
2619 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2620 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2621 }
2622}
2623
2624/*
2625 * rs_initialize_lq - Initialize a station's hardware rate table
2626 *
2627 * The uCode's station table contains a table of fallback rates
2628 * for automatic fallback during transmission.
2629 *
2630 * NOTE: This sets up a default set of values. These will be replaced later
2631 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2632 * rc80211_simple.
2633 *
2634 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2635 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2636 * which requires station table entry to exist).
2637 */
2638static void rs_initialize_lq(struct iwl_mvm *mvm,
2639 struct ieee80211_sta *sta,
2640 struct iwl_lq_sta *lq_sta,
2641 enum nl80211_band band)
2642{
2643 struct iwl_scale_tbl_info *tbl;
2644 struct rs_rate *rate;
2645 u8 active_tbl = 0;
2646
2647 if (!sta || !lq_sta)
2648 return;
2649
2650 if (!lq_sta->search_better_tbl)
2651 active_tbl = lq_sta->active_tbl;
2652 else
2653 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2654
2655 tbl = &(lq_sta->lq_info[active_tbl]);
2656 rate = &tbl->rate;
2657
2658 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2659 rs_init_optimal_rate(mvm, sta, lq_sta);
2660
2661 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2662 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2663 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2664 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2665
2666 tbl->column = rs_get_column_from_rate(rate);
2667
2668 rs_set_expected_tpt_table(lq_sta, tbl);
2669 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2670 /* TODO restore station should remember the lq cmd */
2671 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2672}
2673
2674static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2675 void *mvm_sta,
2676 struct ieee80211_tx_rate_control *txrc)
2677{
2678 struct iwl_op_mode *op_mode = mvm_r;
2679 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2680 struct sk_buff *skb = txrc->skb;
2681 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2682 struct iwl_lq_sta *lq_sta;
2683 struct rs_rate *optimal_rate;
2684 u32 last_ucode_rate;
2685
2686 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2687 /* if vif isn't initialized mvm doesn't know about
2688 * this station, so don't do anything with the it
2689 */
2690 mvm_sta = NULL;
2691 }
2692
2693 if (!mvm_sta)
2694 return;
2695
2696 lq_sta = mvm_sta;
2697
2698 spin_lock_bh(&lq_sta->pers.lock);
2699 iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags,
2700 info->band, &info->control.rates[0]);
2701 info->control.rates[0].count = 1;
2702
2703 /* Report the optimal rate based on rssi and STA caps if we haven't
2704 * converged yet (too little traffic) or exploring other modulations
2705 */
2706 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2707 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2708 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2709 optimal_rate);
2710 iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band,
2711 &txrc->reported_rate);
2712 }
2713 spin_unlock_bh(&lq_sta->pers.lock);
2714}
2715
2716static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2717 gfp_t gfp)
2718{
2719 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2720 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2721 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2722 struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2723
2724 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2725
2726 lq_sta->pers.drv = mvm;
2727#ifdef CONFIG_MAC80211_DEBUGFS
2728 lq_sta->pers.dbg_fixed_rate = 0;
2729 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2730 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2731#endif
2732 lq_sta->pers.chains = 0;
2733 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2734 lq_sta->pers.last_rssi = S8_MIN;
2735
2736 return lq_sta;
2737}
2738
2739static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2740 int nss)
2741{
2742 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2743 (0x3 << (2 * (nss - 1)));
2744 rx_mcs >>= (2 * (nss - 1));
2745
2746 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2747 return IWL_RATE_MCS_7_INDEX;
2748 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2749 return IWL_RATE_MCS_8_INDEX;
2750 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2751 return IWL_RATE_MCS_9_INDEX;
2752
2753 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2754 return -1;
2755}
2756
2757static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2758 struct ieee80211_sta_vht_cap *vht_cap,
2759 struct iwl_lq_sta *lq_sta)
2760{
2761 int i;
2762 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2763
2764 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2765 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2766 if (i == IWL_RATE_9M_INDEX)
2767 continue;
2768
2769 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2770 if (i == IWL_RATE_MCS_9_INDEX &&
2771 sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2772 continue;
2773
2774 lq_sta->active_siso_rate |= BIT(i);
2775 }
2776 }
2777
2778 if (sta->deflink.rx_nss < 2)
2779 return;
2780
2781 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2782 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2783 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2784 if (i == IWL_RATE_9M_INDEX)
2785 continue;
2786
2787 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2788 if (i == IWL_RATE_MCS_9_INDEX &&
2789 sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2790 continue;
2791
2792 lq_sta->active_mimo2_rate |= BIT(i);
2793 }
2794 }
2795}
2796
2797static void rs_ht_init(struct iwl_mvm *mvm,
2798 struct ieee80211_sta *sta,
2799 struct iwl_lq_sta *lq_sta,
2800 struct ieee80211_sta_ht_cap *ht_cap)
2801{
2802 /* active_siso_rate mask includes 9 MBits (bit 5),
2803 * and CCK (bits 0-3), supp_rates[] does not;
2804 * shift to convert format, force 9 MBits off.
2805 */
2806 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2807 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2808 lq_sta->active_siso_rate &= ~((u16)0x2);
2809 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2810
2811 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2812 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2813 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2814 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2815
2816 if (mvm->cfg->ht_params->ldpc &&
2817 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2818 lq_sta->ldpc = true;
2819
2820 if (mvm->cfg->ht_params->stbc &&
2821 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2822 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2823 lq_sta->stbc_capable = true;
2824
2825 lq_sta->is_vht = false;
2826}
2827
2828static void rs_vht_init(struct iwl_mvm *mvm,
2829 struct ieee80211_sta *sta,
2830 struct iwl_lq_sta *lq_sta,
2831 struct ieee80211_sta_vht_cap *vht_cap)
2832{
2833 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2834
2835 if (mvm->cfg->ht_params->ldpc &&
2836 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2837 lq_sta->ldpc = true;
2838
2839 if (mvm->cfg->ht_params->stbc &&
2840 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2841 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2842 lq_sta->stbc_capable = true;
2843
2844 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2845 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2846 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2847 lq_sta->bfer_capable = true;
2848
2849 lq_sta->is_vht = true;
2850}
2851
2852#ifdef CONFIG_IWLWIFI_DEBUGFS
2853void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2854{
2855 spin_lock_bh(&mvm->drv_stats_lock);
2856 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2857 spin_unlock_bh(&mvm->drv_stats_lock);
2858}
2859
2860void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2861{
2862 u8 nss = 0;
2863
2864 spin_lock(&mvm->drv_stats_lock);
2865
2866 if (agg)
2867 mvm->drv_rx_stats.agg_frames++;
2868
2869 mvm->drv_rx_stats.success_frames++;
2870
2871 switch (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) {
2872 case RATE_MCS_CHAN_WIDTH_20:
2873 mvm->drv_rx_stats.bw_20_frames++;
2874 break;
2875 case RATE_MCS_CHAN_WIDTH_40:
2876 mvm->drv_rx_stats.bw_40_frames++;
2877 break;
2878 case RATE_MCS_CHAN_WIDTH_80:
2879 mvm->drv_rx_stats.bw_80_frames++;
2880 break;
2881 case RATE_MCS_CHAN_WIDTH_160:
2882 mvm->drv_rx_stats.bw_160_frames++;
2883 break;
2884 default:
2885 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2886 }
2887
2888 if (rate & RATE_MCS_HT_MSK_V1) {
2889 mvm->drv_rx_stats.ht_frames++;
2890 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) >> RATE_HT_MCS_NSS_POS_V1) + 1;
2891 } else if (rate & RATE_MCS_VHT_MSK_V1) {
2892 mvm->drv_rx_stats.vht_frames++;
2893 nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
2894 } else {
2895 mvm->drv_rx_stats.legacy_frames++;
2896 }
2897
2898 if (nss == 1)
2899 mvm->drv_rx_stats.siso_frames++;
2900 else if (nss == 2)
2901 mvm->drv_rx_stats.mimo2_frames++;
2902
2903 if (rate & RATE_MCS_SGI_MSK_V1)
2904 mvm->drv_rx_stats.sgi_frames++;
2905 else
2906 mvm->drv_rx_stats.ngi_frames++;
2907
2908 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2909 mvm->drv_rx_stats.last_frame_idx =
2910 (mvm->drv_rx_stats.last_frame_idx + 1) %
2911 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2912
2913 spin_unlock(&mvm->drv_stats_lock);
2914}
2915#endif
2916
2917/*
2918 * Called after adding a new station to initialize rate scaling
2919 */
2920static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2921 enum nl80211_band band)
2922{
2923 int i, j;
2924 struct ieee80211_hw *hw = mvm->hw;
2925 struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2926 struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
2927 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2928 struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2929 struct ieee80211_supported_band *sband;
2930 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2931
2932 lockdep_assert_held(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
2933
2934 /* clear all non-persistent lq data */
2935 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2936
2937 sband = hw->wiphy->bands[band];
2938
2939 lq_sta->lq.sta_id = mvmsta->deflink.sta_id;
2940 mvmsta->amsdu_enabled = 0;
2941 mvmsta->max_amsdu_len = sta->cur->max_amsdu_len;
2942
2943 for (j = 0; j < LQ_SIZE; j++)
2944 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2945
2946 lq_sta->flush_timer = 0;
2947 lq_sta->last_tx = jiffies;
2948
2949 IWL_DEBUG_RATE(mvm,
2950 "LQ: *** rate scale station global init for station %d ***\n",
2951 mvmsta->deflink.sta_id);
2952 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2953 * the lowest or the highest rate.. Could consider using RSSI from
2954 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2955 * after assoc.. */
2956
2957 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2958 lq_sta->band = sband->band;
2959 /*
2960 * active legacy rates as per supported rates bitmap
2961 */
2962 supp = sta->deflink.supp_rates[sband->band];
2963 lq_sta->active_legacy_rate = 0;
2964 for_each_set_bit(i, &supp, BITS_PER_LONG)
2965 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2966
2967 /* TODO: should probably account for rx_highest for both HT/VHT */
2968 if (!vht_cap || !vht_cap->vht_supported)
2969 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2970 else
2971 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2972
2973 lq_sta->max_legacy_rate_idx =
2974 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2975 lq_sta->max_siso_rate_idx =
2976 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2977 lq_sta->max_mimo2_rate_idx =
2978 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2979
2980 IWL_DEBUG_RATE(mvm,
2981 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2982 lq_sta->active_legacy_rate,
2983 lq_sta->active_siso_rate,
2984 lq_sta->active_mimo2_rate,
2985 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2986 lq_sta->bfer_capable);
2987 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2988 lq_sta->max_legacy_rate_idx,
2989 lq_sta->max_siso_rate_idx,
2990 lq_sta->max_mimo2_rate_idx);
2991
2992 /* These values will be overridden later */
2993 lq_sta->lq.single_stream_ant_msk =
2994 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
2995 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2996
2997 /* as default allow aggregation for all tids */
2998 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2999 lq_sta->is_agg = 0;
3000#ifdef CONFIG_IWLWIFI_DEBUGFS
3001 iwl_mvm_reset_frame_stats(mvm);
3002#endif
3003 rs_initialize_lq(mvm, sta, lq_sta, band);
3004}
3005
3006static void rs_drv_rate_update(void *mvm_r,
3007 struct ieee80211_supported_band *sband,
3008 struct cfg80211_chan_def *chandef,
3009 struct ieee80211_sta *sta,
3010 void *priv_sta, u32 changed)
3011{
3012 struct iwl_op_mode *op_mode = mvm_r;
3013 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3014 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3015 u8 tid;
3016
3017 if (!mvmsta->vif)
3018 return;
3019
3020 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3021 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3022 ieee80211_stop_tx_ba_session(sta, tid);
3023
3024 iwl_mvm_rs_rate_init(mvm, mvmsta->vif, sta,
3025 &mvmsta->vif->bss_conf, &sta->deflink,
3026 sband->band);
3027}
3028
3029static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3030 struct ieee80211_sta *sta,
3031 int tid, struct ieee80211_tx_info *info,
3032 bool ndp)
3033{
3034 int legacy_success;
3035 int retries;
3036 int i;
3037 struct iwl_lq_cmd *table;
3038 u32 lq_hwrate;
3039 struct rs_rate lq_rate, tx_resp_rate;
3040 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3041 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3042 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3043 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3044 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3045 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3046 struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
3047
3048 if (!lq_sta->pers.drv) {
3049 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3050 return;
3051 }
3052
3053 /* This packet was aggregated but doesn't carry status info */
3054 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3055 !(info->flags & IEEE80211_TX_STAT_AMPDU))
3056 return;
3057
3058 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3059 &tx_resp_rate)) {
3060 WARN_ON_ONCE(1);
3061 return;
3062 }
3063
3064#ifdef CONFIG_MAC80211_DEBUGFS
3065 /* Disable last tx check if we are debugging with fixed rate but
3066 * update tx stats
3067 */
3068 if (lq_sta->pers.dbg_fixed_rate) {
3069 int index = tx_resp_rate.index;
3070 enum rs_column column;
3071 int attempts, success;
3072
3073 column = rs_get_column_from_rate(&tx_resp_rate);
3074 if (WARN_ONCE(column == RS_COLUMN_INVALID,
3075 "Can't map rate 0x%x to column",
3076 tx_resp_hwrate))
3077 return;
3078
3079 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3080 attempts = info->status.ampdu_len;
3081 success = info->status.ampdu_ack_len;
3082 } else {
3083 attempts = info->status.rates[0].count;
3084 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3085 }
3086
3087 lq_sta->pers.tx_stats[column][index].total += attempts;
3088 lq_sta->pers.tx_stats[column][index].success += success;
3089
3090 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3091 tx_resp_hwrate, success, attempts);
3092 return;
3093 }
3094#endif
3095
3096 if (time_after(jiffies,
3097 (unsigned long)(lq_sta->last_tx +
3098 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3099 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3100 /* reach here only in case of driver RS, call directly
3101 * the unlocked version
3102 */
3103 rs_drv_rate_init(mvm, sta, info->band);
3104 return;
3105 }
3106 lq_sta->last_tx = jiffies;
3107
3108 /* Ignore this Tx frame response if its initial rate doesn't match
3109 * that of latest Link Quality command. There may be stragglers
3110 * from a previous Link Quality command, but we're no longer interested
3111 * in those; they're either from the "active" mode while we're trying
3112 * to check "search" mode, or a prior "search" mode after we've moved
3113 * to a new "search" mode (which might become the new "active" mode).
3114 */
3115 table = &lq_sta->lq;
3116 lq_hwrate = le32_to_cpu(table->rs_table[0]);
3117 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3118 WARN_ON_ONCE(1);
3119 return;
3120 }
3121
3122 /* Here we actually compare this rate to the latest LQ command */
3123 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3124 IWL_DEBUG_RATE(mvm,
3125 "tx resp color 0x%x does not match 0x%x\n",
3126 lq_color, LQ_FLAG_COLOR_GET(table->flags));
3127
3128 /* Since rates mis-match, the last LQ command may have failed.
3129 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3130 * ... driver.
3131 */
3132 lq_sta->missed_rate_counter++;
3133 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3134 lq_sta->missed_rate_counter = 0;
3135 IWL_DEBUG_RATE(mvm,
3136 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3137 lq_sta->rs_state);
3138 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3139 }
3140 /* Regardless, ignore this status info for outdated rate */
3141 return;
3142 }
3143
3144 /* Rate did match, so reset the missed_rate_counter */
3145 lq_sta->missed_rate_counter = 0;
3146
3147 if (!lq_sta->search_better_tbl) {
3148 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3149 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3150 } else {
3151 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3152 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3153 }
3154
3155 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3156 IWL_DEBUG_RATE(mvm,
3157 "Neither active nor search matches tx rate\n");
3158 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3159 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3160 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3161 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3162 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3163
3164 /* no matching table found, let's by-pass the data collection
3165 * and continue to perform rate scale to find the rate table
3166 */
3167 rs_stay_in_table(lq_sta, true);
3168 goto done;
3169 }
3170
3171 /* Updating the frame history depends on whether packets were
3172 * aggregated.
3173 *
3174 * For aggregation, all packets were transmitted at the same rate, the
3175 * first index into rate scale table.
3176 */
3177 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3178 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3179 info->status.ampdu_len,
3180 info->status.ampdu_ack_len,
3181 reduced_txp);
3182
3183 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3184 * it as a single frame loss as we don't want the success ratio
3185 * to dip too quickly because a BA wasn't received.
3186 * For TPC, there's no need for this optimisation since we want
3187 * to recover very quickly from a bad power reduction and,
3188 * therefore we'd like the success ratio to get an immediate hit
3189 * when failing to get a BA, so we'd switch back to a lower or
3190 * zero power reduction. When FW transmits agg with a rate
3191 * different from the initial rate, it will not use reduced txp
3192 * and will send BA notification twice (one empty with reduced
3193 * txp equal to the value from LQ and one with reduced txp 0).
3194 * We need to update counters for each txp level accordingly.
3195 */
3196 if (info->status.ampdu_ack_len == 0)
3197 info->status.ampdu_len = 1;
3198
3199 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3200 tx_resp_rate.index,
3201 info->status.ampdu_len,
3202 info->status.ampdu_ack_len);
3203
3204 /* Update success/fail counts if not searching for new mode */
3205 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3206 lq_sta->total_success += info->status.ampdu_ack_len;
3207 lq_sta->total_failed += (info->status.ampdu_len -
3208 info->status.ampdu_ack_len);
3209 }
3210 } else {
3211 /* For legacy, update frame history with for each Tx retry. */
3212 retries = info->status.rates[0].count - 1;
3213 /* HW doesn't send more than 15 retries */
3214 retries = min(retries, 15);
3215
3216 /* The last transmission may have been successful */
3217 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3218 /* Collect data for each rate used during failed TX attempts */
3219 for (i = 0; i <= retries; ++i) {
3220 lq_hwrate = le32_to_cpu(table->rs_table[i]);
3221 if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3222 &lq_rate)) {
3223 WARN_ON_ONCE(1);
3224 return;
3225 }
3226
3227 /* Only collect stats if retried rate is in the same RS
3228 * table as active/search.
3229 */
3230 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3231 tmp_tbl = curr_tbl;
3232 else if (rs_rate_column_match(&lq_rate,
3233 &other_tbl->rate))
3234 tmp_tbl = other_tbl;
3235 else
3236 continue;
3237
3238 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3239 tx_resp_rate.index, 1,
3240 i < retries ? 0 : legacy_success,
3241 reduced_txp);
3242 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3243 tx_resp_rate.index, 1,
3244 i < retries ? 0 : legacy_success);
3245 }
3246
3247 /* Update success/fail counts if not searching for new mode */
3248 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3249 lq_sta->total_success += legacy_success;
3250 lq_sta->total_failed += retries + (1 - legacy_success);
3251 }
3252 }
3253 /* The last TX rate is cached in lq_sta; it's set in if/else above */
3254 lq_sta->last_rate_n_flags = lq_hwrate;
3255 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3256done:
3257 /* See if there's a better rate or modulation mode to try. */
3258 if (sta->deflink.supp_rates[info->band])
3259 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3260}
3261
3262void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3263 int tid, struct ieee80211_tx_info *info, bool ndp)
3264{
3265 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3266
3267 /* If it's locked we are in middle of init flow
3268 * just wait for next tx status to update the lq_sta data
3269 */
3270 if (!spin_trylock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock))
3271 return;
3272
3273 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3274 spin_unlock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
3275}
3276
3277#ifdef CONFIG_MAC80211_DEBUGFS
3278static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3279 struct iwl_lq_cmd *lq_cmd,
3280 enum nl80211_band band,
3281 u32 ucode_rate)
3282{
3283 struct rs_rate rate;
3284 int i;
3285 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3286 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3287 u8 ant = (ucode_rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3288
3289 for (i = 0; i < num_rates; i++)
3290 lq_cmd->rs_table[i] = ucode_rate_le32;
3291
3292 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3293 WARN_ON_ONCE(1);
3294 return;
3295 }
3296
3297 if (is_mimo(&rate))
3298 lq_cmd->mimo_delim = num_rates - 1;
3299 else
3300 lq_cmd->mimo_delim = 0;
3301
3302 lq_cmd->reduced_tpc = 0;
3303
3304 if (num_of_ant(ant) == 1)
3305 lq_cmd->single_stream_ant_msk = ant;
3306
3307 if (!mvm->trans->trans_cfg->gen2)
3308 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3309 else
3310 lq_cmd->agg_frame_cnt_limit =
3311 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3312}
3313#endif /* CONFIG_MAC80211_DEBUGFS */
3314
3315static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3316 struct iwl_lq_sta *lq_sta,
3317 struct rs_rate *rate,
3318 __le32 *rs_table, int *rs_table_index,
3319 int num_rates, int num_retries,
3320 u8 valid_tx_ant, bool toggle_ant)
3321{
3322 int i, j;
3323 __le32 ucode_rate;
3324 bool bottom_reached = false;
3325 int prev_rate_idx = rate->index;
3326 int end = LINK_QUAL_MAX_RETRY_NUM;
3327 int index = *rs_table_index;
3328
3329 for (i = 0; i < num_rates && index < end; i++) {
3330 for (j = 0; j < num_retries && index < end; j++, index++) {
3331 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3332 rate));
3333 rs_table[index] = ucode_rate;
3334 if (toggle_ant)
3335 rs_toggle_antenna(valid_tx_ant, rate);
3336 }
3337
3338 prev_rate_idx = rate->index;
3339 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3340 if (bottom_reached && !is_legacy(rate))
3341 break;
3342 }
3343
3344 if (!bottom_reached && !is_legacy(rate))
3345 rate->index = prev_rate_idx;
3346
3347 *rs_table_index = index;
3348}
3349
3350/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3351 * column the rate table should look like this:
3352 *
3353 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3354 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3355 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3356 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3357 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3358 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3359 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3360 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3361 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3362 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3363 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3364 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3365 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3366 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3367 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3368 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3369 */
3370static void rs_build_rates_table(struct iwl_mvm *mvm,
3371 struct ieee80211_sta *sta,
3372 struct iwl_lq_sta *lq_sta,
3373 const struct rs_rate *initial_rate)
3374{
3375 struct rs_rate rate;
3376 int num_rates, num_retries, index = 0;
3377 u8 valid_tx_ant = 0;
3378 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3379 bool toggle_ant = false;
3380 u32 color;
3381
3382 memcpy(&rate, initial_rate, sizeof(rate));
3383
3384 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3385
3386 /* TODO: remove old API when min FW API hits 14 */
3387 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3388 rs_stbc_allow(mvm, sta, lq_sta))
3389 rate.stbc = true;
3390
3391 if (is_siso(&rate)) {
3392 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3393 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3394 } else if (is_mimo(&rate)) {
3395 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3396 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3397 } else {
3398 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3399 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3400 toggle_ant = true;
3401 }
3402
3403 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3404 num_rates, num_retries, valid_tx_ant,
3405 toggle_ant);
3406
3407 rs_get_lower_rate_down_column(lq_sta, &rate);
3408
3409 if (is_siso(&rate)) {
3410 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3411 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3412 lq_cmd->mimo_delim = index;
3413 } else if (is_legacy(&rate)) {
3414 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3415 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3416 } else {
3417 WARN_ON_ONCE(1);
3418 }
3419
3420 toggle_ant = true;
3421
3422 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3423 num_rates, num_retries, valid_tx_ant,
3424 toggle_ant);
3425
3426 rs_get_lower_rate_down_column(lq_sta, &rate);
3427
3428 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3429 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3430
3431 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3432 num_rates, num_retries, valid_tx_ant,
3433 toggle_ant);
3434
3435 /* update the color of the LQ command (as a counter at bits 1-3) */
3436 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3437 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3438}
3439
3440struct rs_bfer_active_iter_data {
3441 struct ieee80211_sta *exclude_sta;
3442 struct iwl_mvm_sta *bfer_mvmsta;
3443};
3444
3445static void rs_bfer_active_iter(void *_data,
3446 struct ieee80211_sta *sta)
3447{
3448 struct rs_bfer_active_iter_data *data = _data;
3449 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3450 struct iwl_lq_cmd *lq_cmd = &mvmsta->deflink.lq_sta.rs_drv.lq;
3451 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3452
3453 if (sta == data->exclude_sta)
3454 return;
3455
3456 /* The current sta has BFER allowed */
3457 if (ss_params & LQ_SS_BFER_ALLOWED) {
3458 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3459
3460 data->bfer_mvmsta = mvmsta;
3461 }
3462}
3463
3464static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3465{
3466 int prio = -1;
3467 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3468
3469 switch (viftype) {
3470 case NL80211_IFTYPE_AP:
3471 case NL80211_IFTYPE_P2P_GO:
3472 prio = 3;
3473 break;
3474 case NL80211_IFTYPE_P2P_CLIENT:
3475 prio = 2;
3476 break;
3477 case NL80211_IFTYPE_STATION:
3478 prio = 1;
3479 break;
3480 default:
3481 WARN_ONCE(true, "viftype %d sta_id %d", viftype,
3482 sta->deflink.sta_id);
3483 prio = -1;
3484 }
3485
3486 return prio;
3487}
3488
3489/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3490static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3491 struct iwl_mvm_sta *sta2)
3492{
3493 int prio1 = rs_bfer_priority(sta1);
3494 int prio2 = rs_bfer_priority(sta2);
3495
3496 if (prio1 > prio2)
3497 return 1;
3498 if (prio1 < prio2)
3499 return -1;
3500 return 0;
3501}
3502
3503static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3504 struct ieee80211_sta *sta,
3505 struct iwl_lq_sta *lq_sta,
3506 const struct rs_rate *initial_rate)
3507{
3508 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3509 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3510 struct rs_bfer_active_iter_data data = {
3511 .exclude_sta = sta,
3512 .bfer_mvmsta = NULL,
3513 };
3514 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3515 u32 ss_params = LQ_SS_PARAMS_VALID;
3516
3517 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3518 goto out;
3519
3520#ifdef CONFIG_MAC80211_DEBUGFS
3521 /* Check if forcing the decision is configured.
3522 * Note that SISO is forced by not allowing STBC or BFER
3523 */
3524 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3525 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3526 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3527 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3528
3529 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3530 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3531 lq_sta->pers.ss_force);
3532 goto out;
3533 }
3534#endif
3535
3536 if (lq_sta->stbc_capable)
3537 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3538
3539 if (!lq_sta->bfer_capable)
3540 goto out;
3541
3542 ieee80211_iterate_stations_atomic(mvm->hw,
3543 rs_bfer_active_iter,
3544 &data);
3545 bfer_mvmsta = data.bfer_mvmsta;
3546
3547 /* This code is safe as it doesn't run concurrently for different
3548 * stations. This is guaranteed by the fact that calls to
3549 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3550 */
3551 if (!bfer_mvmsta) {
3552 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3553
3554 ss_params |= LQ_SS_BFER_ALLOWED;
3555 goto out;
3556 }
3557
3558 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3559 bfer_mvmsta->deflink.sta_id);
3560
3561 /* Disallow BFER on another STA if active and we're a higher priority */
3562 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3563 struct iwl_lq_cmd *bfersta_lq_cmd =
3564 &bfer_mvmsta->deflink.lq_sta.rs_drv.lq;
3565 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3566
3567 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3568 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3569 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3570
3571 ss_params |= LQ_SS_BFER_ALLOWED;
3572 IWL_DEBUG_RATE(mvm,
3573 "Lower priority BFER sta found (%d). Switch BFER\n",
3574 bfer_mvmsta->deflink.sta_id);
3575 }
3576out:
3577 lq_cmd->ss_params = cpu_to_le32(ss_params);
3578}
3579
3580static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3581 struct ieee80211_sta *sta,
3582 struct iwl_lq_sta *lq_sta,
3583 const struct rs_rate *initial_rate)
3584{
3585 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3586 struct iwl_mvm_sta *mvmsta;
3587 struct iwl_mvm_vif *mvmvif;
3588
3589 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3590 lq_cmd->agg_time_limit =
3591 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3592
3593#ifdef CONFIG_MAC80211_DEBUGFS
3594 if (lq_sta->pers.dbg_fixed_rate) {
3595 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3596 lq_sta->band,
3597 lq_sta->pers.dbg_fixed_rate);
3598 return;
3599 }
3600#endif
3601 if (WARN_ON_ONCE(!sta || !initial_rate))
3602 return;
3603
3604 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3605
3606 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3607 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3608
3609 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3610 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3611
3612 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3613 num_of_ant(initial_rate->ant) == 1)
3614 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3615
3616 lq_cmd->agg_frame_cnt_limit = lq_sta->pers.max_agg_bufsize;
3617
3618 /*
3619 * In case of low latency, tell the firmware to leave a frame in the
3620 * Tx Fifo so that it can start a transaction in the same TxOP. This
3621 * basically allows the firmware to send bursts.
3622 */
3623 if (iwl_mvm_vif_low_latency(mvmvif))
3624 lq_cmd->agg_frame_cnt_limit--;
3625
3626 if (mvmsta->vif->p2p)
3627 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3628
3629 lq_cmd->agg_time_limit =
3630 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3631}
3632
3633static void *rs_alloc(struct ieee80211_hw *hw)
3634{
3635 return hw->priv;
3636}
3637
3638/* rate scale requires free function to be implemented */
3639static void rs_free(void *mvm_rate)
3640{
3641 return;
3642}
3643
3644static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3645{
3646 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3647 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3648
3649 IWL_DEBUG_RATE(mvm, "enter\n");
3650 IWL_DEBUG_RATE(mvm, "leave\n");
3651}
3652
3653int rs_pretty_print_rate_v1(char *buf, int bufsz, const u32 rate)
3654{
3655
3656 char *type;
3657 u8 mcs = 0, nss = 0;
3658 u8 ant = (rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3659 u32 bw = (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) >>
3660 RATE_MCS_CHAN_WIDTH_POS;
3661
3662 if (!(rate & RATE_MCS_HT_MSK_V1) &&
3663 !(rate & RATE_MCS_VHT_MSK_V1) &&
3664 !(rate & RATE_MCS_HE_MSK_V1)) {
3665 int index = iwl_hwrate_to_plcp_idx(rate);
3666
3667 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3668 iwl_rs_pretty_ant(ant),
3669 index == IWL_RATE_INVALID ? "BAD" :
3670 iwl_rate_mcs(index)->mbps);
3671 }
3672
3673 if (rate & RATE_MCS_VHT_MSK_V1) {
3674 type = "VHT";
3675 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3676 nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
3677 } else if (rate & RATE_MCS_HT_MSK_V1) {
3678 type = "HT";
3679 mcs = rate & RATE_HT_MCS_INDEX_MSK_V1;
3680 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1)
3681 >> RATE_HT_MCS_NSS_POS_V1) + 1;
3682 } else if (rate & RATE_MCS_HE_MSK_V1) {
3683 type = "HE";
3684 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3685 nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
3686 } else {
3687 type = "Unknown"; /* shouldn't happen */
3688 }
3689
3690 return scnprintf(buf, bufsz,
3691 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s",
3692 rate, type, iwl_rs_pretty_ant(ant), iwl_rs_pretty_bw(bw), mcs, nss,
3693 (rate & RATE_MCS_SGI_MSK_V1) ? "SGI " : "NGI ",
3694 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3695 (rate & RATE_MCS_LDPC_MSK_V1) ? "LDPC " : "",
3696 (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "",
3697 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3698}
3699
3700#ifdef CONFIG_MAC80211_DEBUGFS
3701/*
3702 * Program the device to use fixed rate for frame transmit
3703 * This is for debugging/testing only
3704 * once the device start use fixed rate, we need to reload the module
3705 * to being back the normal operation.
3706 */
3707static void rs_program_fix_rate(struct iwl_mvm *mvm,
3708 struct iwl_lq_sta *lq_sta)
3709{
3710 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3711 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3712 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3713
3714 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3715 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3716
3717 if (lq_sta->pers.dbg_fixed_rate) {
3718 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3719 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3720 }
3721}
3722
3723static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3724 const char __user *user_buf, size_t count, loff_t *ppos)
3725{
3726 struct iwl_lq_sta *lq_sta = file->private_data;
3727 struct iwl_mvm *mvm;
3728 char buf[64];
3729 size_t buf_size;
3730 u32 parsed_rate;
3731
3732 mvm = lq_sta->pers.drv;
3733 memset(buf, 0, sizeof(buf));
3734 buf_size = min(count, sizeof(buf) - 1);
3735 if (copy_from_user(buf, user_buf, buf_size))
3736 return -EFAULT;
3737
3738 if (sscanf(buf, "%x", &parsed_rate) == 1)
3739 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3740 else
3741 lq_sta->pers.dbg_fixed_rate = 0;
3742
3743 rs_program_fix_rate(mvm, lq_sta);
3744
3745 return count;
3746}
3747
3748static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3749 char __user *user_buf, size_t count, loff_t *ppos)
3750{
3751 char *buff;
3752 int desc = 0;
3753 int i = 0;
3754 ssize_t ret;
3755 static const size_t bufsz = 2048;
3756
3757 struct iwl_lq_sta *lq_sta = file->private_data;
3758 struct iwl_mvm_sta *mvmsta =
3759 container_of(lq_sta, struct iwl_mvm_sta, deflink.lq_sta.rs_drv);
3760 struct iwl_mvm *mvm;
3761 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3762 struct rs_rate *rate = &tbl->rate;
3763 u32 ss_params;
3764
3765 mvm = lq_sta->pers.drv;
3766 buff = kmalloc(bufsz, GFP_KERNEL);
3767 if (!buff)
3768 return -ENOMEM;
3769
3770 desc += scnprintf(buff + desc, bufsz - desc,
3771 "sta_id %d\n", lq_sta->lq.sta_id);
3772 desc += scnprintf(buff + desc, bufsz - desc,
3773 "failed=%d success=%d rate=0%lX\n",
3774 lq_sta->total_failed, lq_sta->total_success,
3775 lq_sta->active_legacy_rate);
3776 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3777 lq_sta->pers.dbg_fixed_rate);
3778 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s\n",
3779 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3780 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "");
3781 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3782 (is_legacy(rate)) ? "legacy" :
3783 is_vht(rate) ? "VHT" : "HT");
3784 if (!is_legacy(rate)) {
3785 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3786 (is_siso(rate)) ? "SISO" : "MIMO2");
3787 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3788 (is_ht20(rate)) ? "20MHz" :
3789 (is_ht40(rate)) ? "40MHz" :
3790 (is_ht80(rate)) ? "80MHz" :
3791 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3792 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3793 (rate->sgi) ? "SGI" : "NGI",
3794 (rate->ldpc) ? "LDPC" : "BCC",
3795 (lq_sta->is_agg) ? "AGG on" : "",
3796 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3797 }
3798 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3799 lq_sta->last_rate_n_flags);
3800 desc += scnprintf(buff + desc, bufsz - desc,
3801 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3802 lq_sta->lq.flags,
3803 lq_sta->lq.mimo_delim,
3804 lq_sta->lq.single_stream_ant_msk,
3805 lq_sta->lq.dual_stream_ant_msk);
3806
3807 desc += scnprintf(buff + desc, bufsz - desc,
3808 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3809 le16_to_cpu(lq_sta->lq.agg_time_limit),
3810 lq_sta->lq.agg_disable_start_th,
3811 lq_sta->lq.agg_frame_cnt_limit);
3812
3813 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3814 lq_sta->lq.reduced_tpc);
3815 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3816 desc += scnprintf(buff + desc, bufsz - desc,
3817 "single stream params: %s%s%s%s\n",
3818 (ss_params & LQ_SS_PARAMS_VALID) ?
3819 "VALID" : "INVALID",
3820 (ss_params & LQ_SS_BFER_ALLOWED) ?
3821 ", BFER" : "",
3822 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3823 ", STBC" : "",
3824 (ss_params & LQ_SS_FORCE) ?
3825 ", FORCE" : "");
3826 desc += scnprintf(buff + desc, bufsz - desc,
3827 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3828 lq_sta->lq.initial_rate_index[0],
3829 lq_sta->lq.initial_rate_index[1],
3830 lq_sta->lq.initial_rate_index[2],
3831 lq_sta->lq.initial_rate_index[3]);
3832
3833 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3834 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3835
3836 desc += scnprintf(buff + desc, bufsz - desc,
3837 " rate[%d] 0x%X ", i, r);
3838 desc += rs_pretty_print_rate_v1(buff + desc, bufsz - desc, r);
3839 if (desc < bufsz - 1)
3840 buff[desc++] = '\n';
3841 }
3842
3843 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3844 kfree(buff);
3845 return ret;
3846}
3847
3848static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3849 .write = rs_sta_dbgfs_scale_table_write,
3850 .read = rs_sta_dbgfs_scale_table_read,
3851 .open = simple_open,
3852 .llseek = default_llseek,
3853};
3854static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3855 char __user *user_buf, size_t count, loff_t *ppos)
3856{
3857 char *buff;
3858 int desc = 0;
3859 int i, j;
3860 ssize_t ret;
3861 struct iwl_scale_tbl_info *tbl;
3862 struct rs_rate *rate;
3863 struct iwl_lq_sta *lq_sta = file->private_data;
3864
3865 buff = kmalloc(1024, GFP_KERNEL);
3866 if (!buff)
3867 return -ENOMEM;
3868
3869 for (i = 0; i < LQ_SIZE; i++) {
3870 tbl = &(lq_sta->lq_info[i]);
3871 rate = &tbl->rate;
3872 desc += sprintf(buff+desc,
3873 "%s type=%d SGI=%d BW=%s DUP=0\n"
3874 "index=%d\n",
3875 lq_sta->active_tbl == i ? "*" : "x",
3876 rate->type,
3877 rate->sgi,
3878 is_ht20(rate) ? "20MHz" :
3879 is_ht40(rate) ? "40MHz" :
3880 is_ht80(rate) ? "80MHz" :
3881 is_ht160(rate) ? "160MHz" : "ERR",
3882 rate->index);
3883 for (j = 0; j < IWL_RATE_COUNT; j++) {
3884 desc += sprintf(buff+desc,
3885 "counter=%d success=%d %%=%d\n",
3886 tbl->win[j].counter,
3887 tbl->win[j].success_counter,
3888 tbl->win[j].success_ratio);
3889 }
3890 }
3891 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3892 kfree(buff);
3893 return ret;
3894}
3895
3896static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3897 .read = rs_sta_dbgfs_stats_table_read,
3898 .open = simple_open,
3899 .llseek = default_llseek,
3900};
3901
3902static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3903 char __user *user_buf,
3904 size_t count, loff_t *ppos)
3905{
3906 static const char * const column_name[] = {
3907 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3908 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3909 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3910 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3911 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3912 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3913 [RS_COLUMN_MIMO2] = "MIMO2",
3914 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3915 };
3916
3917 static const char * const rate_name[] = {
3918 [IWL_RATE_1M_INDEX] = "1M",
3919 [IWL_RATE_2M_INDEX] = "2M",
3920 [IWL_RATE_5M_INDEX] = "5.5M",
3921 [IWL_RATE_11M_INDEX] = "11M",
3922 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3923 [IWL_RATE_9M_INDEX] = "9M",
3924 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3925 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3926 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3927 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3928 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3929 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3930 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3931 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3932 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3933 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3934 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3935 };
3936
3937 char *buff, *pos, *endpos;
3938 int col, rate;
3939 ssize_t ret;
3940 struct iwl_lq_sta *lq_sta = file->private_data;
3941 struct rs_rate_stats *stats;
3942 static const size_t bufsz = 1024;
3943
3944 buff = kmalloc(bufsz, GFP_KERNEL);
3945 if (!buff)
3946 return -ENOMEM;
3947
3948 pos = buff;
3949 endpos = pos + bufsz;
3950
3951 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3952 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3953 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3954 pos += scnprintf(pos, endpos - pos, "\n");
3955
3956 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3957 pos += scnprintf(pos, endpos - pos,
3958 "%s,", column_name[col]);
3959
3960 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3961 stats = &(lq_sta->pers.tx_stats[col][rate]);
3962 pos += scnprintf(pos, endpos - pos,
3963 "%llu/%llu,",
3964 stats->success,
3965 stats->total);
3966 }
3967 pos += scnprintf(pos, endpos - pos, "\n");
3968 }
3969
3970 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3971 kfree(buff);
3972 return ret;
3973}
3974
3975static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3976 const char __user *user_buf,
3977 size_t count, loff_t *ppos)
3978{
3979 struct iwl_lq_sta *lq_sta = file->private_data;
3980 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3981
3982 return count;
3983}
3984
3985static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3986 .read = rs_sta_dbgfs_drv_tx_stats_read,
3987 .write = rs_sta_dbgfs_drv_tx_stats_write,
3988 .open = simple_open,
3989 .llseek = default_llseek,
3990};
3991
3992static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3993 char __user *user_buf,
3994 size_t count, loff_t *ppos)
3995{
3996 struct iwl_lq_sta *lq_sta = file->private_data;
3997 char buf[12];
3998 int bufsz = sizeof(buf);
3999 int pos = 0;
4000 static const char * const ss_force_name[] = {
4001 [RS_SS_FORCE_NONE] = "none",
4002 [RS_SS_FORCE_STBC] = "stbc",
4003 [RS_SS_FORCE_BFER] = "bfer",
4004 [RS_SS_FORCE_SISO] = "siso",
4005 };
4006
4007 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4008 ss_force_name[lq_sta->pers.ss_force]);
4009 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4010}
4011
4012static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4013 size_t count, loff_t *ppos)
4014{
4015 struct iwl_mvm *mvm = lq_sta->pers.drv;
4016 int ret = 0;
4017
4018 if (!strncmp("none", buf, 4)) {
4019 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4020 } else if (!strncmp("siso", buf, 4)) {
4021 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4022 } else if (!strncmp("stbc", buf, 4)) {
4023 if (lq_sta->stbc_capable) {
4024 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4025 } else {
4026 IWL_ERR(mvm,
4027 "can't force STBC. peer doesn't support\n");
4028 ret = -EINVAL;
4029 }
4030 } else if (!strncmp("bfer", buf, 4)) {
4031 if (lq_sta->bfer_capable) {
4032 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4033 } else {
4034 IWL_ERR(mvm,
4035 "can't force BFER. peer doesn't support\n");
4036 ret = -EINVAL;
4037 }
4038 } else {
4039 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4040 ret = -EINVAL;
4041 }
4042 return ret ?: count;
4043}
4044
4045#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4046 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4047#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
4048 debugfs_create_file(#name, mode, parent, lq_sta, \
4049 &iwl_dbgfs_##name##_ops); \
4050 } while (0)
4051
4052MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4053
4054static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4055 struct dentry *dir)
4056{
4057 struct iwl_lq_sta *lq_sta = priv_sta;
4058 struct iwl_mvm_sta *mvmsta;
4059
4060 mvmsta = container_of(lq_sta, struct iwl_mvm_sta,
4061 deflink.lq_sta.rs_drv);
4062
4063 if (!mvmsta->vif)
4064 return;
4065
4066 debugfs_create_file("rate_scale_table", 0600, dir,
4067 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4068 debugfs_create_file("rate_stats_table", 0400, dir,
4069 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4070 debugfs_create_file("drv_tx_stats", 0600, dir,
4071 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4072 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4073 &lq_sta->tx_agg_tid_en);
4074 debugfs_create_u8("reduced_tpc", 0600, dir,
4075 &lq_sta->pers.dbg_fixed_txp_reduction);
4076
4077 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4078}
4079#endif
4080
4081/*
4082 * Initialization of rate scaling information is done by driver after
4083 * the station is added. Since mac80211 calls this function before a
4084 * station is added we ignore it.
4085 */
4086static void rs_rate_init_ops(void *mvm_r,
4087 struct ieee80211_supported_band *sband,
4088 struct cfg80211_chan_def *chandef,
4089 struct ieee80211_sta *sta, void *mvm_sta)
4090{
4091}
4092
4093/* ops for rate scaling implemented in the driver */
4094static const struct rate_control_ops rs_mvm_ops_drv = {
4095 .name = RS_NAME,
4096 .tx_status = rs_drv_mac80211_tx_status,
4097 .get_rate = rs_drv_get_rate,
4098 .rate_init = rs_rate_init_ops,
4099 .alloc = rs_alloc,
4100 .free = rs_free,
4101 .alloc_sta = rs_drv_alloc_sta,
4102 .free_sta = rs_free_sta,
4103 .rate_update = rs_drv_rate_update,
4104#ifdef CONFIG_MAC80211_DEBUGFS
4105 .add_sta_debugfs = rs_drv_add_sta_debugfs,
4106#endif
4107 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4108};
4109
4110void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm,
4111 struct ieee80211_vif *vif,
4112 struct ieee80211_sta *sta,
4113 struct ieee80211_bss_conf *link_conf,
4114 struct ieee80211_link_sta *link_sta,
4115 enum nl80211_band band)
4116{
4117 if (iwl_mvm_has_tlc_offload(mvm)) {
4118 iwl_mvm_rs_fw_rate_init(mvm, vif, sta, link_conf,
4119 link_sta, band);
4120 } else {
4121 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4122
4123 spin_lock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
4124 rs_drv_rate_init(mvm, sta, band);
4125 spin_unlock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
4126 }
4127}
4128
4129int iwl_mvm_rate_control_register(void)
4130{
4131 return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4132}
4133
4134void iwl_mvm_rate_control_unregister(void)
4135{
4136 ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4137}
4138
4139static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4140 bool enable)
4141{
4142 struct iwl_lq_cmd *lq = &mvmsta->deflink.lq_sta.rs_drv.lq;
4143
4144 lockdep_assert_held(&mvm->mutex);
4145
4146 if (enable) {
4147 if (mvmsta->tx_protection == 0)
4148 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4149 mvmsta->tx_protection++;
4150 } else {
4151 mvmsta->tx_protection--;
4152 if (mvmsta->tx_protection == 0)
4153 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4154 }
4155
4156 return iwl_mvm_send_lq_cmd(mvm, lq);
4157}
4158
4159/**
4160 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4161 * @mvm: The mvm component
4162 * @mvmsta: The station
4163 * @enable: Enable Tx protection?
4164 */
4165int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4166 bool enable)
4167{
4168 if (iwl_mvm_has_tlc_offload(mvm))
4169 return rs_fw_tx_protection(mvm, mvmsta, enable);
4170 else
4171 return rs_drv_tx_protection(mvm, mvmsta, enable);
4172}
1// SPDX-License-Identifier: GPL-2.0-only
2/******************************************************************************
3 *
4 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
5 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
6 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
7 * Copyright(c) 2018 - 2019 Intel Corporation
8 *
9 * Contact Information:
10 * Intel Linux Wireless <linuxwifi@intel.com>
11 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
12 *
13 *****************************************************************************/
14#include <linux/kernel.h>
15#include <linux/skbuff.h>
16#include <linux/slab.h>
17#include <net/mac80211.h>
18
19#include <linux/netdevice.h>
20#include <linux/etherdevice.h>
21#include <linux/delay.h>
22
23#include <linux/workqueue.h>
24#include "rs.h"
25#include "fw-api.h"
26#include "sta.h"
27#include "iwl-op-mode.h"
28#include "mvm.h"
29#include "debugfs.h"
30
31#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
32
33/* Calculations of success ratio are done in fixed point where 12800 is 100%.
34 * Use this macro when dealing with thresholds consts set as a percentage
35 */
36#define RS_PERCENT(x) (128 * x)
37
38static u8 rs_ht_to_legacy[] = {
39 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
40 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
41 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
42 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
43 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
44 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
45 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
46 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
47 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
48 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
49};
50
51static const u8 ant_toggle_lookup[] = {
52 [ANT_NONE] = ANT_NONE,
53 [ANT_A] = ANT_B,
54 [ANT_B] = ANT_A,
55 [ANT_AB] = ANT_AB,
56};
57
58#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
59 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
60 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
61 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
62 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
63 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
64 IWL_RATE_##rp##M_INDEX, \
65 IWL_RATE_##rn##M_INDEX }
66
67#define IWL_DECLARE_MCS_RATE(s) \
68 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
69 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
70 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
71 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
72 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
73 IWL_RATE_INVM_INDEX, \
74 IWL_RATE_INVM_INDEX }
75
76/*
77 * Parameter order:
78 * rate, ht rate, prev rate, next rate
79 *
80 * If there isn't a valid next or previous rate then INV is used which
81 * maps to IWL_RATE_INVALID
82 *
83 */
84static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
85 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
86 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
87 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
88 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
89 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
90 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
91 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
92 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
93 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
94 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
95 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
96 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
97 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
98 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
99 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
100};
101
102enum rs_action {
103 RS_ACTION_STAY = 0,
104 RS_ACTION_DOWNSCALE = -1,
105 RS_ACTION_UPSCALE = 1,
106};
107
108enum rs_column_mode {
109 RS_INVALID = 0,
110 RS_LEGACY,
111 RS_SISO,
112 RS_MIMO2,
113};
114
115#define MAX_NEXT_COLUMNS 7
116#define MAX_COLUMN_CHECKS 3
117
118struct rs_tx_column;
119
120typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
121 struct ieee80211_sta *sta,
122 struct rs_rate *rate,
123 const struct rs_tx_column *next_col);
124
125struct rs_tx_column {
126 enum rs_column_mode mode;
127 u8 ant;
128 bool sgi;
129 enum rs_column next_columns[MAX_NEXT_COLUMNS];
130 allow_column_func_t checks[MAX_COLUMN_CHECKS];
131};
132
133static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
134 struct rs_rate *rate,
135 const struct rs_tx_column *next_col)
136{
137 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
138}
139
140static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
141 struct rs_rate *rate,
142 const struct rs_tx_column *next_col)
143{
144 if (!sta->ht_cap.ht_supported)
145 return false;
146
147 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
148 return false;
149
150 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
151 return false;
152
153 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
154 return false;
155
156 if (mvm->nvm_data->sku_cap_mimo_disabled)
157 return false;
158
159 return true;
160}
161
162static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
163 struct rs_rate *rate,
164 const struct rs_tx_column *next_col)
165{
166 if (!sta->ht_cap.ht_supported)
167 return false;
168
169 return true;
170}
171
172static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
173 struct rs_rate *rate,
174 const struct rs_tx_column *next_col)
175{
176 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
177 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
178
179 if (is_ht20(rate) && (ht_cap->cap &
180 IEEE80211_HT_CAP_SGI_20))
181 return true;
182 if (is_ht40(rate) && (ht_cap->cap &
183 IEEE80211_HT_CAP_SGI_40))
184 return true;
185 if (is_ht80(rate) && (vht_cap->cap &
186 IEEE80211_VHT_CAP_SHORT_GI_80))
187 return true;
188 if (is_ht160(rate) && (vht_cap->cap &
189 IEEE80211_VHT_CAP_SHORT_GI_160))
190 return true;
191
192 return false;
193}
194
195static const struct rs_tx_column rs_tx_columns[] = {
196 [RS_COLUMN_LEGACY_ANT_A] = {
197 .mode = RS_LEGACY,
198 .ant = ANT_A,
199 .next_columns = {
200 RS_COLUMN_LEGACY_ANT_B,
201 RS_COLUMN_SISO_ANT_A,
202 RS_COLUMN_MIMO2,
203 RS_COLUMN_INVALID,
204 RS_COLUMN_INVALID,
205 RS_COLUMN_INVALID,
206 RS_COLUMN_INVALID,
207 },
208 .checks = {
209 rs_ant_allow,
210 },
211 },
212 [RS_COLUMN_LEGACY_ANT_B] = {
213 .mode = RS_LEGACY,
214 .ant = ANT_B,
215 .next_columns = {
216 RS_COLUMN_LEGACY_ANT_A,
217 RS_COLUMN_SISO_ANT_B,
218 RS_COLUMN_MIMO2,
219 RS_COLUMN_INVALID,
220 RS_COLUMN_INVALID,
221 RS_COLUMN_INVALID,
222 RS_COLUMN_INVALID,
223 },
224 .checks = {
225 rs_ant_allow,
226 },
227 },
228 [RS_COLUMN_SISO_ANT_A] = {
229 .mode = RS_SISO,
230 .ant = ANT_A,
231 .next_columns = {
232 RS_COLUMN_SISO_ANT_B,
233 RS_COLUMN_MIMO2,
234 RS_COLUMN_SISO_ANT_A_SGI,
235 RS_COLUMN_LEGACY_ANT_A,
236 RS_COLUMN_LEGACY_ANT_B,
237 RS_COLUMN_INVALID,
238 RS_COLUMN_INVALID,
239 },
240 .checks = {
241 rs_siso_allow,
242 rs_ant_allow,
243 },
244 },
245 [RS_COLUMN_SISO_ANT_B] = {
246 .mode = RS_SISO,
247 .ant = ANT_B,
248 .next_columns = {
249 RS_COLUMN_SISO_ANT_A,
250 RS_COLUMN_MIMO2,
251 RS_COLUMN_SISO_ANT_B_SGI,
252 RS_COLUMN_LEGACY_ANT_A,
253 RS_COLUMN_LEGACY_ANT_B,
254 RS_COLUMN_INVALID,
255 RS_COLUMN_INVALID,
256 },
257 .checks = {
258 rs_siso_allow,
259 rs_ant_allow,
260 },
261 },
262 [RS_COLUMN_SISO_ANT_A_SGI] = {
263 .mode = RS_SISO,
264 .ant = ANT_A,
265 .sgi = true,
266 .next_columns = {
267 RS_COLUMN_SISO_ANT_B_SGI,
268 RS_COLUMN_MIMO2_SGI,
269 RS_COLUMN_SISO_ANT_A,
270 RS_COLUMN_LEGACY_ANT_A,
271 RS_COLUMN_LEGACY_ANT_B,
272 RS_COLUMN_INVALID,
273 RS_COLUMN_INVALID,
274 },
275 .checks = {
276 rs_siso_allow,
277 rs_ant_allow,
278 rs_sgi_allow,
279 },
280 },
281 [RS_COLUMN_SISO_ANT_B_SGI] = {
282 .mode = RS_SISO,
283 .ant = ANT_B,
284 .sgi = true,
285 .next_columns = {
286 RS_COLUMN_SISO_ANT_A_SGI,
287 RS_COLUMN_MIMO2_SGI,
288 RS_COLUMN_SISO_ANT_B,
289 RS_COLUMN_LEGACY_ANT_A,
290 RS_COLUMN_LEGACY_ANT_B,
291 RS_COLUMN_INVALID,
292 RS_COLUMN_INVALID,
293 },
294 .checks = {
295 rs_siso_allow,
296 rs_ant_allow,
297 rs_sgi_allow,
298 },
299 },
300 [RS_COLUMN_MIMO2] = {
301 .mode = RS_MIMO2,
302 .ant = ANT_AB,
303 .next_columns = {
304 RS_COLUMN_SISO_ANT_A,
305 RS_COLUMN_MIMO2_SGI,
306 RS_COLUMN_LEGACY_ANT_A,
307 RS_COLUMN_LEGACY_ANT_B,
308 RS_COLUMN_INVALID,
309 RS_COLUMN_INVALID,
310 RS_COLUMN_INVALID,
311 },
312 .checks = {
313 rs_mimo_allow,
314 },
315 },
316 [RS_COLUMN_MIMO2_SGI] = {
317 .mode = RS_MIMO2,
318 .ant = ANT_AB,
319 .sgi = true,
320 .next_columns = {
321 RS_COLUMN_SISO_ANT_A_SGI,
322 RS_COLUMN_MIMO2,
323 RS_COLUMN_LEGACY_ANT_A,
324 RS_COLUMN_LEGACY_ANT_B,
325 RS_COLUMN_INVALID,
326 RS_COLUMN_INVALID,
327 RS_COLUMN_INVALID,
328 },
329 .checks = {
330 rs_mimo_allow,
331 rs_sgi_allow,
332 },
333 },
334};
335
336static inline u8 rs_extract_rate(u32 rate_n_flags)
337{
338 /* also works for HT because bits 7:6 are zero there */
339 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
340}
341
342static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
343{
344 int idx = 0;
345
346 if (rate_n_flags & RATE_MCS_HT_MSK) {
347 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
348 idx += IWL_RATE_MCS_0_INDEX;
349
350 /* skip 9M not supported in HT*/
351 if (idx >= IWL_RATE_9M_INDEX)
352 idx += 1;
353 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
354 return idx;
355 } else if (rate_n_flags & RATE_MCS_VHT_MSK ||
356 rate_n_flags & RATE_MCS_HE_MSK) {
357 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
358 idx += IWL_RATE_MCS_0_INDEX;
359
360 /* skip 9M not supported in VHT*/
361 if (idx >= IWL_RATE_9M_INDEX)
362 idx++;
363 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
364 return idx;
365 if ((rate_n_flags & RATE_MCS_HE_MSK) &&
366 (idx <= IWL_LAST_HE_RATE))
367 return idx;
368 } else {
369 /* legacy rate format, search for match in table */
370
371 u8 legacy_rate = rs_extract_rate(rate_n_flags);
372 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
373 if (iwl_rates[idx].plcp == legacy_rate)
374 return idx;
375 }
376
377 return IWL_RATE_INVALID;
378}
379
380static void rs_rate_scale_perform(struct iwl_mvm *mvm,
381 struct ieee80211_sta *sta,
382 struct iwl_lq_sta *lq_sta,
383 int tid, bool ndp);
384static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
385 struct ieee80211_sta *sta,
386 struct iwl_lq_sta *lq_sta,
387 const struct rs_rate *initial_rate);
388static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
389
390/**
391 * The following tables contain the expected throughput metrics for all rates
392 *
393 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
394 *
395 * where invalid entries are zeros.
396 *
397 * CCK rates are only valid in legacy table and will only be used in G
398 * (2.4 GHz) band.
399 */
400
401static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
402 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
403};
404
405/* Expected TpT tables. 4 indexes:
406 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
407 */
408static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
409 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
410 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
411 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
412 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
413};
414
415static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
416 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
417 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
418 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
419 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
420};
421
422static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
423 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
424 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
425 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
426 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
427};
428
429static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
430 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
431 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
432 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
433 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
434};
435
436static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
437 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
438 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
439 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
440 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
441};
442
443static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
444 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
445 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
446 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
447 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
448};
449
450static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
451 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
452 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
453 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
454 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
455};
456
457static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
458 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
459 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
460 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
461 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
462};
463
464/* mbps, mcs */
465static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
466 { "1", "BPSK DSSS"},
467 { "2", "QPSK DSSS"},
468 {"5.5", "BPSK CCK"},
469 { "11", "QPSK CCK"},
470 { "6", "BPSK 1/2"},
471 { "9", "BPSK 1/2"},
472 { "12", "QPSK 1/2"},
473 { "18", "QPSK 3/4"},
474 { "24", "16QAM 1/2"},
475 { "36", "16QAM 3/4"},
476 { "48", "64QAM 2/3"},
477 { "54", "64QAM 3/4"},
478 { "60", "64QAM 5/6"},
479};
480
481#define MCS_INDEX_PER_STREAM (8)
482
483static const char *rs_pretty_ant(u8 ant)
484{
485 static const char * const ant_name[] = {
486 [ANT_NONE] = "None",
487 [ANT_A] = "A",
488 [ANT_B] = "B",
489 [ANT_AB] = "AB",
490 [ANT_C] = "C",
491 [ANT_AC] = "AC",
492 [ANT_BC] = "BC",
493 [ANT_ABC] = "ABC",
494 };
495
496 if (ant > ANT_ABC)
497 return "UNKNOWN";
498
499 return ant_name[ant];
500}
501
502static const char *rs_pretty_lq_type(enum iwl_table_type type)
503{
504 static const char * const lq_types[] = {
505 [LQ_NONE] = "NONE",
506 [LQ_LEGACY_A] = "LEGACY_A",
507 [LQ_LEGACY_G] = "LEGACY_G",
508 [LQ_HT_SISO] = "HT SISO",
509 [LQ_HT_MIMO2] = "HT MIMO",
510 [LQ_VHT_SISO] = "VHT SISO",
511 [LQ_VHT_MIMO2] = "VHT MIMO",
512 [LQ_HE_SISO] = "HE SISO",
513 [LQ_HE_MIMO2] = "HE MIMO",
514 };
515
516 if (type < LQ_NONE || type >= LQ_MAX)
517 return "UNKNOWN";
518
519 return lq_types[type];
520}
521
522static char *rs_pretty_rate(const struct rs_rate *rate)
523{
524 static char buf[40];
525 static const char * const legacy_rates[] = {
526 [IWL_RATE_1M_INDEX] = "1M",
527 [IWL_RATE_2M_INDEX] = "2M",
528 [IWL_RATE_5M_INDEX] = "5.5M",
529 [IWL_RATE_11M_INDEX] = "11M",
530 [IWL_RATE_6M_INDEX] = "6M",
531 [IWL_RATE_9M_INDEX] = "9M",
532 [IWL_RATE_12M_INDEX] = "12M",
533 [IWL_RATE_18M_INDEX] = "18M",
534 [IWL_RATE_24M_INDEX] = "24M",
535 [IWL_RATE_36M_INDEX] = "36M",
536 [IWL_RATE_48M_INDEX] = "48M",
537 [IWL_RATE_54M_INDEX] = "54M",
538 };
539 static const char *const ht_vht_rates[] = {
540 [IWL_RATE_MCS_0_INDEX] = "MCS0",
541 [IWL_RATE_MCS_1_INDEX] = "MCS1",
542 [IWL_RATE_MCS_2_INDEX] = "MCS2",
543 [IWL_RATE_MCS_3_INDEX] = "MCS3",
544 [IWL_RATE_MCS_4_INDEX] = "MCS4",
545 [IWL_RATE_MCS_5_INDEX] = "MCS5",
546 [IWL_RATE_MCS_6_INDEX] = "MCS6",
547 [IWL_RATE_MCS_7_INDEX] = "MCS7",
548 [IWL_RATE_MCS_8_INDEX] = "MCS8",
549 [IWL_RATE_MCS_9_INDEX] = "MCS9",
550 };
551 const char *rate_str;
552
553 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
554 rate_str = legacy_rates[rate->index];
555 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
556 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
557 (rate->index <= IWL_RATE_MCS_9_INDEX))
558 rate_str = ht_vht_rates[rate->index];
559 else
560 rate_str = "BAD_RATE";
561
562 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
563 rs_pretty_ant(rate->ant), rate_str);
564 return buf;
565}
566
567static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
568 const char *prefix)
569{
570 IWL_DEBUG_RATE(mvm,
571 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
572 prefix, rs_pretty_rate(rate), rate->bw,
573 rate->sgi, rate->ldpc, rate->stbc);
574}
575
576static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
577{
578 window->data = 0;
579 window->success_counter = 0;
580 window->success_ratio = IWL_INVALID_VALUE;
581 window->counter = 0;
582 window->average_tpt = IWL_INVALID_VALUE;
583}
584
585static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
586 struct iwl_scale_tbl_info *tbl)
587{
588 int i;
589
590 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
591 for (i = 0; i < IWL_RATE_COUNT; i++)
592 rs_rate_scale_clear_window(&tbl->win[i]);
593
594 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
595 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
596}
597
598static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
599{
600 return (ant_type & valid_antenna) == ant_type;
601}
602
603static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
604 struct iwl_lq_sta *lq_data, u8 tid,
605 struct ieee80211_sta *sta)
606{
607 int ret = -EAGAIN;
608
609 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
610 sta->addr, tid);
611
612 /* start BA session until the peer sends del BA */
613 ret = ieee80211_start_tx_ba_session(sta, tid, 0);
614 if (ret == -EAGAIN) {
615 /*
616 * driver and mac80211 is out of sync
617 * this might be cause by reloading firmware
618 * stop the tx ba session here
619 */
620 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
621 tid);
622 ieee80211_stop_tx_ba_session(sta, tid);
623 }
624 return ret;
625}
626
627static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
628 u8 tid, struct iwl_lq_sta *lq_sta,
629 struct ieee80211_sta *sta)
630{
631 struct iwl_mvm_tid_data *tid_data;
632
633 /*
634 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
635 * when the frame is not QoS
636 */
637 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
638 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
639 tid, IWL_MAX_TID_COUNT);
640 return;
641 } else if (tid == IWL_MAX_TID_COUNT) {
642 return;
643 }
644
645 tid_data = &mvmsta->tid_data[tid];
646 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
647 tid_data->state == IWL_AGG_OFF &&
648 (lq_sta->tx_agg_tid_en & BIT(tid)) &&
649 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
650 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
651 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
652 tid_data->state = IWL_AGG_QUEUED;
653 }
654}
655
656static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
657{
658 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
659 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
660 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
661}
662
663/*
664 * Static function to get the expected throughput from an iwl_scale_tbl_info
665 * that wraps a NULL pointer check
666 */
667static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
668{
669 if (tbl->expected_tpt)
670 return tbl->expected_tpt[rs_index];
671 return 0;
672}
673
674/**
675 * rs_collect_tx_data - Update the success/failure sliding window
676 *
677 * We keep a sliding window of the last 62 packets transmitted
678 * at this rate. window->data contains the bitmask of successful
679 * packets.
680 */
681static int _rs_collect_tx_data(struct iwl_mvm *mvm,
682 struct iwl_scale_tbl_info *tbl,
683 int scale_index, int attempts, int successes,
684 struct iwl_rate_scale_data *window)
685{
686 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
687 s32 fail_count, tpt;
688
689 /* Get expected throughput */
690 tpt = get_expected_tpt(tbl, scale_index);
691
692 /*
693 * Keep track of only the latest 62 tx frame attempts in this rate's
694 * history window; anything older isn't really relevant any more.
695 * If we have filled up the sliding window, drop the oldest attempt;
696 * if the oldest attempt (highest bit in bitmap) shows "success",
697 * subtract "1" from the success counter (this is the main reason
698 * we keep these bitmaps!).
699 */
700 while (attempts > 0) {
701 if (window->counter >= IWL_RATE_MAX_WINDOW) {
702 /* remove earliest */
703 window->counter = IWL_RATE_MAX_WINDOW - 1;
704
705 if (window->data & mask) {
706 window->data &= ~mask;
707 window->success_counter--;
708 }
709 }
710
711 /* Increment frames-attempted counter */
712 window->counter++;
713
714 /* Shift bitmap by one frame to throw away oldest history */
715 window->data <<= 1;
716
717 /* Mark the most recent #successes attempts as successful */
718 if (successes > 0) {
719 window->success_counter++;
720 window->data |= 0x1;
721 successes--;
722 }
723
724 attempts--;
725 }
726
727 /* Calculate current success ratio, avoid divide-by-0! */
728 if (window->counter > 0)
729 window->success_ratio = 128 * (100 * window->success_counter)
730 / window->counter;
731 else
732 window->success_ratio = IWL_INVALID_VALUE;
733
734 fail_count = window->counter - window->success_counter;
735
736 /* Calculate average throughput, if we have enough history. */
737 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
738 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
739 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
740 else
741 window->average_tpt = IWL_INVALID_VALUE;
742
743 return 0;
744}
745
746static int rs_collect_tpc_data(struct iwl_mvm *mvm,
747 struct iwl_lq_sta *lq_sta,
748 struct iwl_scale_tbl_info *tbl,
749 int scale_index, int attempts, int successes,
750 u8 reduced_txp)
751{
752 struct iwl_rate_scale_data *window = NULL;
753
754 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
755 return -EINVAL;
756
757 window = &tbl->tpc_win[reduced_txp];
758 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
759 window);
760}
761
762static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
763 struct iwl_mvm_sta *mvmsta,
764 u8 tid, int successes)
765{
766 struct iwl_mvm_tid_data *tid_data;
767
768 if (tid >= IWL_MAX_TID_COUNT)
769 return;
770
771 tid_data = &mvmsta->tid_data[tid];
772
773 /*
774 * Measure if there're enough successful transmits per second.
775 * These statistics are used only to decide if we can start a
776 * BA session, so it should be updated only when A-MPDU is
777 * off.
778 */
779 if (tid_data->state != IWL_AGG_OFF)
780 return;
781
782 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
783 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
784 tid_data->tx_count_last = tid_data->tx_count;
785 tid_data->tx_count = 0;
786 tid_data->tpt_meas_start = jiffies;
787 } else {
788 tid_data->tx_count += successes;
789 }
790}
791
792static int rs_collect_tlc_data(struct iwl_mvm *mvm,
793 struct iwl_mvm_sta *mvmsta, u8 tid,
794 struct iwl_scale_tbl_info *tbl,
795 int scale_index, int attempts, int successes)
796{
797 struct iwl_rate_scale_data *window = NULL;
798
799 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
800 return -EINVAL;
801
802 if (tbl->column != RS_COLUMN_INVALID) {
803 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
804
805 pers->tx_stats[tbl->column][scale_index].total += attempts;
806 pers->tx_stats[tbl->column][scale_index].success += successes;
807 }
808
809 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
810
811 /* Select window for current tx bit rate */
812 window = &(tbl->win[scale_index]);
813 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
814 window);
815}
816
817/* Convert rs_rate object into ucode rate bitmask */
818static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
819 struct rs_rate *rate)
820{
821 u32 ucode_rate = 0;
822 int index = rate->index;
823
824 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
825 RATE_MCS_ANT_ABC_MSK);
826
827 if (is_legacy(rate)) {
828 ucode_rate |= iwl_rates[index].plcp;
829 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
830 ucode_rate |= RATE_MCS_CCK_MSK;
831 return ucode_rate;
832 }
833
834 if (is_ht(rate)) {
835 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
836 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
837 index = IWL_LAST_HT_RATE;
838 }
839 ucode_rate |= RATE_MCS_HT_MSK;
840
841 if (is_ht_siso(rate))
842 ucode_rate |= iwl_rates[index].plcp_ht_siso;
843 else if (is_ht_mimo2(rate))
844 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
845 else
846 WARN_ON_ONCE(1);
847 } else if (is_vht(rate)) {
848 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
849 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
850 index = IWL_LAST_VHT_RATE;
851 }
852 ucode_rate |= RATE_MCS_VHT_MSK;
853 if (is_vht_siso(rate))
854 ucode_rate |= iwl_rates[index].plcp_vht_siso;
855 else if (is_vht_mimo2(rate))
856 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
857 else
858 WARN_ON_ONCE(1);
859
860 } else {
861 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
862 }
863
864 if (is_siso(rate) && rate->stbc) {
865 /* To enable STBC we need to set both a flag and ANT_AB */
866 ucode_rate |= RATE_MCS_ANT_AB_MSK;
867 ucode_rate |= RATE_MCS_STBC_MSK;
868 }
869
870 ucode_rate |= rate->bw;
871 if (rate->sgi)
872 ucode_rate |= RATE_MCS_SGI_MSK;
873 if (rate->ldpc)
874 ucode_rate |= RATE_MCS_LDPC_MSK;
875
876 return ucode_rate;
877}
878
879/* Convert a ucode rate into an rs_rate object */
880static int rs_rate_from_ucode_rate(const u32 ucode_rate,
881 enum nl80211_band band,
882 struct rs_rate *rate)
883{
884 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
885 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
886 u8 nss;
887
888 memset(rate, 0, sizeof(*rate));
889 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
890
891 if (rate->index == IWL_RATE_INVALID)
892 return -EINVAL;
893
894 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
895
896 /* Legacy */
897 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
898 !(ucode_rate & RATE_MCS_VHT_MSK) &&
899 !(ucode_rate & RATE_MCS_HE_MSK)) {
900 if (num_of_ant == 1) {
901 if (band == NL80211_BAND_5GHZ)
902 rate->type = LQ_LEGACY_A;
903 else
904 rate->type = LQ_LEGACY_G;
905 }
906
907 return 0;
908 }
909
910 /* HT, VHT or HE */
911 if (ucode_rate & RATE_MCS_SGI_MSK)
912 rate->sgi = true;
913 if (ucode_rate & RATE_MCS_LDPC_MSK)
914 rate->ldpc = true;
915 if (ucode_rate & RATE_MCS_STBC_MSK)
916 rate->stbc = true;
917 if (ucode_rate & RATE_MCS_BF_MSK)
918 rate->bfer = true;
919
920 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
921
922 if (ucode_rate & RATE_MCS_HT_MSK) {
923 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
924 RATE_HT_MCS_NSS_POS) + 1;
925
926 if (nss == 1) {
927 rate->type = LQ_HT_SISO;
928 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
929 "stbc %d bfer %d",
930 rate->stbc, rate->bfer);
931 } else if (nss == 2) {
932 rate->type = LQ_HT_MIMO2;
933 WARN_ON_ONCE(num_of_ant != 2);
934 } else {
935 WARN_ON_ONCE(1);
936 }
937 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
938 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
939 RATE_VHT_MCS_NSS_POS) + 1;
940
941 if (nss == 1) {
942 rate->type = LQ_VHT_SISO;
943 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
944 "stbc %d bfer %d",
945 rate->stbc, rate->bfer);
946 } else if (nss == 2) {
947 rate->type = LQ_VHT_MIMO2;
948 WARN_ON_ONCE(num_of_ant != 2);
949 } else {
950 WARN_ON_ONCE(1);
951 }
952 } else if (ucode_rate & RATE_MCS_HE_MSK) {
953 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
954 RATE_VHT_MCS_NSS_POS) + 1;
955
956 if (nss == 1) {
957 rate->type = LQ_HE_SISO;
958 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
959 "stbc %d bfer %d", rate->stbc, rate->bfer);
960 } else if (nss == 2) {
961 rate->type = LQ_HE_MIMO2;
962 WARN_ON_ONCE(num_of_ant != 2);
963 } else {
964 WARN_ON_ONCE(1);
965 }
966 }
967
968 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
969 !is_he(rate) && !is_vht(rate));
970
971 return 0;
972}
973
974/* switch to another antenna/antennas and return 1 */
975/* if no other valid antenna found, return 0 */
976static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
977{
978 u8 new_ant_type;
979
980 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C))
981 return 0;
982
983 if (!rs_is_valid_ant(valid_ant, rate->ant))
984 return 0;
985
986 new_ant_type = ant_toggle_lookup[rate->ant];
987
988 while ((new_ant_type != rate->ant) &&
989 !rs_is_valid_ant(valid_ant, new_ant_type))
990 new_ant_type = ant_toggle_lookup[new_ant_type];
991
992 if (new_ant_type == rate->ant)
993 return 0;
994
995 rate->ant = new_ant_type;
996
997 return 1;
998}
999
1000static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
1001 struct rs_rate *rate)
1002{
1003 if (is_legacy(rate))
1004 return lq_sta->active_legacy_rate;
1005 else if (is_siso(rate))
1006 return lq_sta->active_siso_rate;
1007 else if (is_mimo2(rate))
1008 return lq_sta->active_mimo2_rate;
1009
1010 WARN_ON_ONCE(1);
1011 return 0;
1012}
1013
1014static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1015 int rate_type)
1016{
1017 u8 high = IWL_RATE_INVALID;
1018 u8 low = IWL_RATE_INVALID;
1019
1020 /* 802.11A or ht walks to the next literal adjacent rate in
1021 * the rate table */
1022 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1023 int i;
1024 u32 mask;
1025
1026 /* Find the previous rate that is in the rate mask */
1027 i = index - 1;
1028 if (i >= 0)
1029 mask = BIT(i);
1030 for (; i >= 0; i--, mask >>= 1) {
1031 if (rate_mask & mask) {
1032 low = i;
1033 break;
1034 }
1035 }
1036
1037 /* Find the next rate that is in the rate mask */
1038 i = index + 1;
1039 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1040 if (rate_mask & mask) {
1041 high = i;
1042 break;
1043 }
1044 }
1045
1046 return (high << 8) | low;
1047 }
1048
1049 low = index;
1050 while (low != IWL_RATE_INVALID) {
1051 low = iwl_rates[low].prev_rs;
1052 if (low == IWL_RATE_INVALID)
1053 break;
1054 if (rate_mask & (1 << low))
1055 break;
1056 }
1057
1058 high = index;
1059 while (high != IWL_RATE_INVALID) {
1060 high = iwl_rates[high].next_rs;
1061 if (high == IWL_RATE_INVALID)
1062 break;
1063 if (rate_mask & (1 << high))
1064 break;
1065 }
1066
1067 return (high << 8) | low;
1068}
1069
1070static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1071 struct rs_rate *rate)
1072{
1073 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1074}
1075
1076/* Get the next supported lower rate in the current column.
1077 * Return true if bottom rate in the current column was reached
1078 */
1079static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1080 struct rs_rate *rate)
1081{
1082 u8 low;
1083 u16 high_low;
1084 u16 rate_mask;
1085 struct iwl_mvm *mvm = lq_sta->pers.drv;
1086
1087 rate_mask = rs_get_supported_rates(lq_sta, rate);
1088 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1089 rate->type);
1090 low = high_low & 0xff;
1091
1092 /* Bottom rate of column reached */
1093 if (low == IWL_RATE_INVALID)
1094 return true;
1095
1096 rate->index = low;
1097 return false;
1098}
1099
1100/* Get the next rate to use following a column downgrade */
1101static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1102 struct rs_rate *rate)
1103{
1104 struct iwl_mvm *mvm = lq_sta->pers.drv;
1105
1106 if (is_legacy(rate)) {
1107 /* No column to downgrade from Legacy */
1108 return;
1109 } else if (is_siso(rate)) {
1110 /* Downgrade to Legacy if we were in SISO */
1111 if (lq_sta->band == NL80211_BAND_5GHZ)
1112 rate->type = LQ_LEGACY_A;
1113 else
1114 rate->type = LQ_LEGACY_G;
1115
1116 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1117
1118 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1119 rate->index > IWL_RATE_MCS_9_INDEX);
1120
1121 rate->index = rs_ht_to_legacy[rate->index];
1122 rate->ldpc = false;
1123 } else {
1124 /* Downgrade to SISO with same MCS if in MIMO */
1125 rate->type = is_vht_mimo2(rate) ?
1126 LQ_VHT_SISO : LQ_HT_SISO;
1127 }
1128
1129 if (num_of_ant(rate->ant) > 1)
1130 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1131
1132 /* Relevant in both switching to SISO or Legacy */
1133 rate->sgi = false;
1134
1135 if (!rs_rate_supported(lq_sta, rate))
1136 rs_get_lower_rate_in_column(lq_sta, rate);
1137}
1138
1139/* Check if both rates share the same column */
1140static inline bool rs_rate_column_match(struct rs_rate *a,
1141 struct rs_rate *b)
1142{
1143 bool ant_match;
1144
1145 if (a->stbc || a->bfer)
1146 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1147 else
1148 ant_match = (a->ant == b->ant);
1149
1150 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1151 && ant_match;
1152}
1153
1154static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1155{
1156 if (is_legacy(rate)) {
1157 if (rate->ant == ANT_A)
1158 return RS_COLUMN_LEGACY_ANT_A;
1159
1160 if (rate->ant == ANT_B)
1161 return RS_COLUMN_LEGACY_ANT_B;
1162
1163 goto err;
1164 }
1165
1166 if (is_siso(rate)) {
1167 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1168 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1169 RS_COLUMN_SISO_ANT_A;
1170
1171 if (rate->ant == ANT_B)
1172 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1173 RS_COLUMN_SISO_ANT_B;
1174
1175 goto err;
1176 }
1177
1178 if (is_mimo(rate))
1179 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1180
1181err:
1182 return RS_COLUMN_INVALID;
1183}
1184
1185static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1186{
1187 u8 tid = IWL_MAX_TID_COUNT;
1188
1189 if (ieee80211_is_data_qos(hdr->frame_control)) {
1190 u8 *qc = ieee80211_get_qos_ctl(hdr);
1191 tid = qc[0] & 0xf;
1192 }
1193
1194 if (unlikely(tid > IWL_MAX_TID_COUNT))
1195 tid = IWL_MAX_TID_COUNT;
1196
1197 return tid;
1198}
1199
1200/*
1201 * mac80211 sends us Tx status
1202 */
1203static void rs_drv_mac80211_tx_status(void *mvm_r,
1204 struct ieee80211_supported_band *sband,
1205 struct ieee80211_sta *sta, void *priv_sta,
1206 struct sk_buff *skb)
1207{
1208 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1209 struct iwl_op_mode *op_mode = mvm_r;
1210 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1212 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1213
1214 if (!mvmsta->vif)
1215 return;
1216
1217 if (!ieee80211_is_data(hdr->frame_control) ||
1218 info->flags & IEEE80211_TX_CTL_NO_ACK)
1219 return;
1220
1221 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1222 ieee80211_is_qos_nullfunc(hdr->frame_control));
1223}
1224
1225/*
1226 * Begin a period of staying with a selected modulation mode.
1227 * Set "stay_in_tbl" flag to prevent any mode switches.
1228 * Set frame tx success limits according to legacy vs. high-throughput,
1229 * and reset overall (spanning all rates) tx success history statistics.
1230 * These control how long we stay using same modulation mode before
1231 * searching for a new mode.
1232 */
1233static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1234 struct iwl_lq_sta *lq_sta)
1235{
1236 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1237 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1238 if (is_legacy) {
1239 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1240 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1241 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1242 } else {
1243 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1244 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1245 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1246 }
1247 lq_sta->table_count = 0;
1248 lq_sta->total_failed = 0;
1249 lq_sta->total_success = 0;
1250 lq_sta->flush_timer = jiffies;
1251 lq_sta->visited_columns = 0;
1252}
1253
1254static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1255{
1256 if (rate_mask)
1257 return find_last_bit(&rate_mask, BITS_PER_LONG);
1258 return IWL_RATE_INVALID;
1259}
1260
1261static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1262 const struct rs_tx_column *column)
1263{
1264 switch (column->mode) {
1265 case RS_LEGACY:
1266 return lq_sta->max_legacy_rate_idx;
1267 case RS_SISO:
1268 return lq_sta->max_siso_rate_idx;
1269 case RS_MIMO2:
1270 return lq_sta->max_mimo2_rate_idx;
1271 default:
1272 WARN_ON_ONCE(1);
1273 }
1274
1275 return lq_sta->max_legacy_rate_idx;
1276}
1277
1278static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1279 const struct rs_tx_column *column,
1280 u32 bw)
1281{
1282 /* Used to choose among HT tables */
1283 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1284
1285 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1286 column->mode != RS_SISO &&
1287 column->mode != RS_MIMO2))
1288 return expected_tpt_legacy;
1289
1290 /* Legacy rates have only one table */
1291 if (column->mode == RS_LEGACY)
1292 return expected_tpt_legacy;
1293
1294 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1295 /* Choose among many HT tables depending on number of streams
1296 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1297 * status */
1298 if (column->mode == RS_SISO) {
1299 switch (bw) {
1300 case RATE_MCS_CHAN_WIDTH_20:
1301 ht_tbl_pointer = expected_tpt_siso_20MHz;
1302 break;
1303 case RATE_MCS_CHAN_WIDTH_40:
1304 ht_tbl_pointer = expected_tpt_siso_40MHz;
1305 break;
1306 case RATE_MCS_CHAN_WIDTH_80:
1307 ht_tbl_pointer = expected_tpt_siso_80MHz;
1308 break;
1309 case RATE_MCS_CHAN_WIDTH_160:
1310 ht_tbl_pointer = expected_tpt_siso_160MHz;
1311 break;
1312 default:
1313 WARN_ON_ONCE(1);
1314 }
1315 } else if (column->mode == RS_MIMO2) {
1316 switch (bw) {
1317 case RATE_MCS_CHAN_WIDTH_20:
1318 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1319 break;
1320 case RATE_MCS_CHAN_WIDTH_40:
1321 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1322 break;
1323 case RATE_MCS_CHAN_WIDTH_80:
1324 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1325 break;
1326 case RATE_MCS_CHAN_WIDTH_160:
1327 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1328 break;
1329 default:
1330 WARN_ON_ONCE(1);
1331 }
1332 } else {
1333 WARN_ON_ONCE(1);
1334 }
1335
1336 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1337 return ht_tbl_pointer[0];
1338 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1339 return ht_tbl_pointer[1];
1340 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1341 return ht_tbl_pointer[2];
1342 else /* AGG+SGI */
1343 return ht_tbl_pointer[3];
1344}
1345
1346static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1347 struct iwl_scale_tbl_info *tbl)
1348{
1349 struct rs_rate *rate = &tbl->rate;
1350 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1351
1352 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1353}
1354
1355/* rs uses two tables, one is active and the second is for searching better
1356 * configuration. This function, according to the index of the currently
1357 * active table returns the search table, which is located at the
1358 * index complementary to 1 according to the active table (active = 1,
1359 * search = 0 or active = 0, search = 1).
1360 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1361 */
1362static inline u8 rs_search_tbl(u8 active_tbl)
1363{
1364 return (active_tbl ^ 1) & 1;
1365}
1366
1367static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1368 struct iwl_lq_sta *lq_sta,
1369 struct iwl_scale_tbl_info *tbl, /* "search" */
1370 unsigned long rate_mask, s8 index)
1371{
1372 struct iwl_scale_tbl_info *active_tbl =
1373 &(lq_sta->lq_info[lq_sta->active_tbl]);
1374 s32 success_ratio = active_tbl->win[index].success_ratio;
1375 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1376 const u16 *tpt_tbl = tbl->expected_tpt;
1377 u16 high_low;
1378 u32 target_tpt;
1379 int rate_idx;
1380
1381 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1382 target_tpt = 100 * expected_current_tpt;
1383 IWL_DEBUG_RATE(mvm,
1384 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1385 success_ratio, target_tpt);
1386 } else {
1387 target_tpt = lq_sta->last_tpt;
1388 IWL_DEBUG_RATE(mvm,
1389 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1390 success_ratio, target_tpt);
1391 }
1392
1393 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1394
1395 while (rate_idx != IWL_RATE_INVALID) {
1396 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1397 break;
1398
1399 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1400 tbl->rate.type);
1401
1402 rate_idx = (high_low >> 8) & 0xff;
1403 }
1404
1405 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1406 rate_idx, target_tpt,
1407 rate_idx != IWL_RATE_INVALID ?
1408 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1409
1410 return rate_idx;
1411}
1412
1413static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1414{
1415 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap;
1416 struct ieee80211_vht_cap vht_cap = {
1417 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1418 .supp_mcs = sta_vht_cap->vht_mcs,
1419 };
1420
1421 switch (sta->bandwidth) {
1422 case IEEE80211_STA_RX_BW_160:
1423 /*
1424 * Don't use 160 MHz if VHT extended NSS support
1425 * says we cannot use 2 streams, we don't want to
1426 * deal with this.
1427 * We only check MCS 0 - they will support that if
1428 * we got here at all and we don't care which MCS,
1429 * we want to determine a more global state.
1430 */
1431 if (ieee80211_get_vht_max_nss(&vht_cap,
1432 IEEE80211_VHT_CHANWIDTH_160MHZ,
1433 0, true) < sta->rx_nss)
1434 return RATE_MCS_CHAN_WIDTH_80;
1435 return RATE_MCS_CHAN_WIDTH_160;
1436 case IEEE80211_STA_RX_BW_80:
1437 return RATE_MCS_CHAN_WIDTH_80;
1438 case IEEE80211_STA_RX_BW_40:
1439 return RATE_MCS_CHAN_WIDTH_40;
1440 case IEEE80211_STA_RX_BW_20:
1441 default:
1442 return RATE_MCS_CHAN_WIDTH_20;
1443 }
1444}
1445
1446/*
1447 * Check whether we should continue using same modulation mode, or
1448 * begin search for a new mode, based on:
1449 * 1) # tx successes or failures while using this mode
1450 * 2) # times calling this function
1451 * 3) elapsed time in this mode (not used, for now)
1452 */
1453static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1454{
1455 struct iwl_scale_tbl_info *tbl;
1456 int active_tbl;
1457 int flush_interval_passed = 0;
1458 struct iwl_mvm *mvm;
1459
1460 mvm = lq_sta->pers.drv;
1461 active_tbl = lq_sta->active_tbl;
1462
1463 tbl = &(lq_sta->lq_info[active_tbl]);
1464
1465 /* If we've been disallowing search, see if we should now allow it */
1466 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1467 /* Elapsed time using current modulation mode */
1468 if (lq_sta->flush_timer)
1469 flush_interval_passed =
1470 time_after(jiffies,
1471 (unsigned long)(lq_sta->flush_timer +
1472 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1473
1474 /*
1475 * Check if we should allow search for new modulation mode.
1476 * If many frames have failed or succeeded, or we've used
1477 * this same modulation for a long time, allow search, and
1478 * reset history stats that keep track of whether we should
1479 * allow a new search. Also (below) reset all bitmaps and
1480 * stats in active history.
1481 */
1482 if (force_search ||
1483 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1484 (lq_sta->total_success > lq_sta->max_success_limit) ||
1485 ((!lq_sta->search_better_tbl) &&
1486 (lq_sta->flush_timer) && (flush_interval_passed))) {
1487 IWL_DEBUG_RATE(mvm,
1488 "LQ: stay is expired %d %d %d\n",
1489 lq_sta->total_failed,
1490 lq_sta->total_success,
1491 flush_interval_passed);
1492
1493 /* Allow search for new mode */
1494 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1495 IWL_DEBUG_RATE(mvm,
1496 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1497 lq_sta->total_failed = 0;
1498 lq_sta->total_success = 0;
1499 lq_sta->flush_timer = 0;
1500 /* mark the current column as visited */
1501 lq_sta->visited_columns = BIT(tbl->column);
1502 /*
1503 * Else if we've used this modulation mode enough repetitions
1504 * (regardless of elapsed time or success/failure), reset
1505 * history bitmaps and rate-specific stats for all rates in
1506 * active table.
1507 */
1508 } else {
1509 lq_sta->table_count++;
1510 if (lq_sta->table_count >=
1511 lq_sta->table_count_limit) {
1512 lq_sta->table_count = 0;
1513
1514 IWL_DEBUG_RATE(mvm,
1515 "LQ: stay in table clear win\n");
1516 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1517 }
1518 }
1519
1520 /* If transitioning to allow "search", reset all history
1521 * bitmaps and stats in active table (this will become the new
1522 * "search" table). */
1523 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1524 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1525 }
1526 }
1527}
1528
1529static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1530 struct iwl_scale_tbl_info *tbl,
1531 enum rs_action scale_action)
1532{
1533 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1534 int i;
1535
1536 /*
1537 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1538 * or 0, since there is no per-TID alg.
1539 */
1540 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1541 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1542 scale_action == RS_ACTION_DOWNSCALE)
1543 mvmsta->amsdu_enabled = 0;
1544 else
1545 mvmsta->amsdu_enabled = 0xFFFF;
1546
1547 if (mvmsta->vif->bss_conf.he_support &&
1548 !iwlwifi_mod_params.disable_11ax)
1549 mvmsta->max_amsdu_len = sta->max_amsdu_len;
1550 else
1551 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1552
1553 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1554
1555 for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1556 if (mvmsta->amsdu_enabled)
1557 sta->max_tid_amsdu_len[i] =
1558 iwl_mvm_max_amsdu_size(mvm, sta, i);
1559 else
1560 /*
1561 * Not so elegant, but this will effectively
1562 * prevent AMSDU on this TID
1563 */
1564 sta->max_tid_amsdu_len[i] = 1;
1565 }
1566}
1567
1568/*
1569 * setup rate table in uCode
1570 */
1571static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1572 struct ieee80211_sta *sta,
1573 struct iwl_lq_sta *lq_sta,
1574 struct iwl_scale_tbl_info *tbl)
1575{
1576 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1577 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1578}
1579
1580static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1581 struct ieee80211_sta *sta,
1582 struct iwl_lq_sta *lq_sta,
1583 struct iwl_scale_tbl_info *tbl,
1584 enum rs_action scale_action)
1585{
1586 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1587 return false;
1588
1589 if (!is_vht_siso(&tbl->rate))
1590 return false;
1591
1592 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1593 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1594 (scale_action == RS_ACTION_DOWNSCALE)) {
1595 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1596 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1597 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1598 goto tweaked;
1599 }
1600
1601 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1602 * sustainable, i.e. we're past the test window. We can't go back
1603 * if MCS5 is just tested as this will happen always after switching
1604 * to 20Mhz MCS4 because the rate stats are cleared.
1605 */
1606 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1607 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1608 (scale_action == RS_ACTION_STAY)) ||
1609 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1610 (scale_action == RS_ACTION_UPSCALE)))) {
1611 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1612 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1613 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1614 goto tweaked;
1615 }
1616
1617 return false;
1618
1619tweaked:
1620 rs_set_expected_tpt_table(lq_sta, tbl);
1621 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1622 return true;
1623}
1624
1625static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1626 struct iwl_lq_sta *lq_sta,
1627 struct ieee80211_sta *sta,
1628 struct iwl_scale_tbl_info *tbl)
1629{
1630 int i, j, max_rate;
1631 enum rs_column next_col_id;
1632 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1633 const struct rs_tx_column *next_col;
1634 allow_column_func_t allow_func;
1635 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1636 const u16 *expected_tpt_tbl;
1637 u16 tpt, max_expected_tpt;
1638
1639 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1640 next_col_id = curr_col->next_columns[i];
1641
1642 if (next_col_id == RS_COLUMN_INVALID)
1643 continue;
1644
1645 if (lq_sta->visited_columns & BIT(next_col_id)) {
1646 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1647 next_col_id);
1648 continue;
1649 }
1650
1651 next_col = &rs_tx_columns[next_col_id];
1652
1653 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1654 IWL_DEBUG_RATE(mvm,
1655 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1656 next_col_id, valid_ants, next_col->ant);
1657 continue;
1658 }
1659
1660 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1661 allow_func = next_col->checks[j];
1662 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1663 next_col))
1664 break;
1665 }
1666
1667 if (j != MAX_COLUMN_CHECKS) {
1668 IWL_DEBUG_RATE(mvm,
1669 "Skip column %d: not allowed (check %d failed)\n",
1670 next_col_id, j);
1671
1672 continue;
1673 }
1674
1675 tpt = lq_sta->last_tpt / 100;
1676 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1677 rs_bw_from_sta_bw(sta));
1678 if (WARN_ON_ONCE(!expected_tpt_tbl))
1679 continue;
1680
1681 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1682 if (max_rate == IWL_RATE_INVALID) {
1683 IWL_DEBUG_RATE(mvm,
1684 "Skip column %d: no rate is allowed in this column\n",
1685 next_col_id);
1686 continue;
1687 }
1688
1689 max_expected_tpt = expected_tpt_tbl[max_rate];
1690 if (tpt >= max_expected_tpt) {
1691 IWL_DEBUG_RATE(mvm,
1692 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1693 next_col_id, max_expected_tpt, tpt);
1694 continue;
1695 }
1696
1697 IWL_DEBUG_RATE(mvm,
1698 "Found potential column %d. Max expected %d current %d\n",
1699 next_col_id, max_expected_tpt, tpt);
1700 break;
1701 }
1702
1703 if (i == MAX_NEXT_COLUMNS)
1704 return RS_COLUMN_INVALID;
1705
1706 return next_col_id;
1707}
1708
1709static int rs_switch_to_column(struct iwl_mvm *mvm,
1710 struct iwl_lq_sta *lq_sta,
1711 struct ieee80211_sta *sta,
1712 enum rs_column col_id)
1713{
1714 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1715 struct iwl_scale_tbl_info *search_tbl =
1716 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1717 struct rs_rate *rate = &search_tbl->rate;
1718 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1719 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1720 unsigned long rate_mask = 0;
1721 u32 rate_idx = 0;
1722
1723 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1724
1725 rate->sgi = column->sgi;
1726 rate->ant = column->ant;
1727
1728 if (column->mode == RS_LEGACY) {
1729 if (lq_sta->band == NL80211_BAND_5GHZ)
1730 rate->type = LQ_LEGACY_A;
1731 else
1732 rate->type = LQ_LEGACY_G;
1733
1734 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1735 rate->ldpc = false;
1736 rate_mask = lq_sta->active_legacy_rate;
1737 } else if (column->mode == RS_SISO) {
1738 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1739 rate_mask = lq_sta->active_siso_rate;
1740 } else if (column->mode == RS_MIMO2) {
1741 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1742 rate_mask = lq_sta->active_mimo2_rate;
1743 } else {
1744 WARN_ONCE(1, "Bad column mode");
1745 }
1746
1747 if (column->mode != RS_LEGACY) {
1748 rate->bw = rs_bw_from_sta_bw(sta);
1749 rate->ldpc = lq_sta->ldpc;
1750 }
1751
1752 search_tbl->column = col_id;
1753 rs_set_expected_tpt_table(lq_sta, search_tbl);
1754
1755 lq_sta->visited_columns |= BIT(col_id);
1756
1757 /* Get the best matching rate if we're changing modes. e.g.
1758 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1759 */
1760 if (curr_column->mode != column->mode) {
1761 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1762 rate_mask, rate->index);
1763
1764 if ((rate_idx == IWL_RATE_INVALID) ||
1765 !(BIT(rate_idx) & rate_mask)) {
1766 IWL_DEBUG_RATE(mvm,
1767 "can not switch with index %d"
1768 " rate mask %lx\n",
1769 rate_idx, rate_mask);
1770
1771 goto err;
1772 }
1773
1774 rate->index = rate_idx;
1775 }
1776
1777 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1778 col_id, rate->index);
1779
1780 return 0;
1781
1782err:
1783 rate->type = LQ_NONE;
1784 return -1;
1785}
1786
1787static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1788 struct iwl_scale_tbl_info *tbl,
1789 s32 sr, int low, int high,
1790 int current_tpt,
1791 int low_tpt, int high_tpt)
1792{
1793 enum rs_action action = RS_ACTION_STAY;
1794
1795 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1796 (current_tpt == 0)) {
1797 IWL_DEBUG_RATE(mvm,
1798 "Decrease rate because of low SR\n");
1799 return RS_ACTION_DOWNSCALE;
1800 }
1801
1802 if ((low_tpt == IWL_INVALID_VALUE) &&
1803 (high_tpt == IWL_INVALID_VALUE) &&
1804 (high != IWL_RATE_INVALID)) {
1805 IWL_DEBUG_RATE(mvm,
1806 "No data about high/low rates. Increase rate\n");
1807 return RS_ACTION_UPSCALE;
1808 }
1809
1810 if ((high_tpt == IWL_INVALID_VALUE) &&
1811 (high != IWL_RATE_INVALID) &&
1812 (low_tpt != IWL_INVALID_VALUE) &&
1813 (low_tpt < current_tpt)) {
1814 IWL_DEBUG_RATE(mvm,
1815 "No data about high rate and low rate is worse. Increase rate\n");
1816 return RS_ACTION_UPSCALE;
1817 }
1818
1819 if ((high_tpt != IWL_INVALID_VALUE) &&
1820 (high_tpt > current_tpt)) {
1821 IWL_DEBUG_RATE(mvm,
1822 "Higher rate is better. Increate rate\n");
1823 return RS_ACTION_UPSCALE;
1824 }
1825
1826 if ((low_tpt != IWL_INVALID_VALUE) &&
1827 (high_tpt != IWL_INVALID_VALUE) &&
1828 (low_tpt < current_tpt) &&
1829 (high_tpt < current_tpt)) {
1830 IWL_DEBUG_RATE(mvm,
1831 "Both high and low are worse. Maintain rate\n");
1832 return RS_ACTION_STAY;
1833 }
1834
1835 if ((low_tpt != IWL_INVALID_VALUE) &&
1836 (low_tpt > current_tpt)) {
1837 IWL_DEBUG_RATE(mvm,
1838 "Lower rate is better\n");
1839 action = RS_ACTION_DOWNSCALE;
1840 goto out;
1841 }
1842
1843 if ((low_tpt == IWL_INVALID_VALUE) &&
1844 (low != IWL_RATE_INVALID)) {
1845 IWL_DEBUG_RATE(mvm,
1846 "No data about lower rate\n");
1847 action = RS_ACTION_DOWNSCALE;
1848 goto out;
1849 }
1850
1851 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1852
1853out:
1854 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1855 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1856 IWL_DEBUG_RATE(mvm,
1857 "SR is above NO DECREASE. Avoid downscale\n");
1858 action = RS_ACTION_STAY;
1859 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1860 IWL_DEBUG_RATE(mvm,
1861 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1862 action = RS_ACTION_STAY;
1863 } else {
1864 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1865 }
1866 }
1867
1868 return action;
1869}
1870
1871static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1872 struct iwl_lq_sta *lq_sta)
1873{
1874 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1875 * supports STBC of at least 1*SS
1876 */
1877 if (!lq_sta->stbc_capable)
1878 return false;
1879
1880 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1881 return false;
1882
1883 return true;
1884}
1885
1886static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1887 int *weaker, int *stronger)
1888{
1889 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1890 if (*weaker > TPC_MAX_REDUCTION)
1891 *weaker = TPC_INVALID;
1892
1893 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1894 if (*stronger < 0)
1895 *stronger = TPC_INVALID;
1896}
1897
1898static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1899 struct rs_rate *rate, enum nl80211_band band)
1900{
1901 int index = rate->index;
1902 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1903 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1904 !vif->bss_conf.ps);
1905
1906 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1907 cam, sta_ps_disabled);
1908 /*
1909 * allow tpc only if power management is enabled, or bt coex
1910 * activity grade allows it and we are on 2.4Ghz.
1911 */
1912 if ((cam || sta_ps_disabled) &&
1913 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1914 return false;
1915
1916 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1917 if (is_legacy(rate))
1918 return index == IWL_RATE_54M_INDEX;
1919 if (is_ht(rate))
1920 return index == IWL_RATE_MCS_7_INDEX;
1921 if (is_vht(rate))
1922 return index == IWL_RATE_MCS_7_INDEX ||
1923 index == IWL_RATE_MCS_8_INDEX ||
1924 index == IWL_RATE_MCS_9_INDEX;
1925
1926 WARN_ON_ONCE(1);
1927 return false;
1928}
1929
1930enum tpc_action {
1931 TPC_ACTION_STAY,
1932 TPC_ACTION_DECREASE,
1933 TPC_ACTION_INCREASE,
1934 TPC_ACTION_NO_RESTIRCTION,
1935};
1936
1937static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1938 s32 sr, int weak, int strong,
1939 int current_tpt,
1940 int weak_tpt, int strong_tpt)
1941{
1942 /* stay until we have valid tpt */
1943 if (current_tpt == IWL_INVALID_VALUE) {
1944 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1945 return TPC_ACTION_STAY;
1946 }
1947
1948 /* Too many failures, increase txp */
1949 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1950 current_tpt == 0) {
1951 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1952 return TPC_ACTION_NO_RESTIRCTION;
1953 }
1954
1955 /* try decreasing first if applicable */
1956 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1957 weak != TPC_INVALID) {
1958 if (weak_tpt == IWL_INVALID_VALUE &&
1959 (strong_tpt == IWL_INVALID_VALUE ||
1960 current_tpt >= strong_tpt)) {
1961 IWL_DEBUG_RATE(mvm,
1962 "no weak txp measurement. decrease txp\n");
1963 return TPC_ACTION_DECREASE;
1964 }
1965
1966 if (weak_tpt > current_tpt) {
1967 IWL_DEBUG_RATE(mvm,
1968 "lower txp has better tpt. decrease txp\n");
1969 return TPC_ACTION_DECREASE;
1970 }
1971 }
1972
1973 /* next, increase if needed */
1974 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1975 strong != TPC_INVALID) {
1976 if (weak_tpt == IWL_INVALID_VALUE &&
1977 strong_tpt != IWL_INVALID_VALUE &&
1978 current_tpt < strong_tpt) {
1979 IWL_DEBUG_RATE(mvm,
1980 "higher txp has better tpt. increase txp\n");
1981 return TPC_ACTION_INCREASE;
1982 }
1983
1984 if (weak_tpt < current_tpt &&
1985 (strong_tpt == IWL_INVALID_VALUE ||
1986 strong_tpt > current_tpt)) {
1987 IWL_DEBUG_RATE(mvm,
1988 "lower txp has worse tpt. increase txp\n");
1989 return TPC_ACTION_INCREASE;
1990 }
1991 }
1992
1993 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1994 return TPC_ACTION_STAY;
1995}
1996
1997static bool rs_tpc_perform(struct iwl_mvm *mvm,
1998 struct ieee80211_sta *sta,
1999 struct iwl_lq_sta *lq_sta,
2000 struct iwl_scale_tbl_info *tbl)
2001{
2002 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2003 struct ieee80211_vif *vif = mvm_sta->vif;
2004 struct ieee80211_chanctx_conf *chanctx_conf;
2005 enum nl80211_band band;
2006 struct iwl_rate_scale_data *window;
2007 struct rs_rate *rate = &tbl->rate;
2008 enum tpc_action action;
2009 s32 sr;
2010 u8 cur = lq_sta->lq.reduced_tpc;
2011 int current_tpt;
2012 int weak, strong;
2013 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2014
2015#ifdef CONFIG_MAC80211_DEBUGFS
2016 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2017 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2018 lq_sta->pers.dbg_fixed_txp_reduction);
2019 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2020 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2021 }
2022#endif
2023
2024 rcu_read_lock();
2025 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2026 if (WARN_ON(!chanctx_conf))
2027 band = NUM_NL80211_BANDS;
2028 else
2029 band = chanctx_conf->def.chan->band;
2030 rcu_read_unlock();
2031
2032 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2033 IWL_DEBUG_RATE(mvm,
2034 "tpc is not allowed. remove txp restrictions\n");
2035 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2036 return cur != TPC_NO_REDUCTION;
2037 }
2038
2039 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2040
2041 /* Collect measured throughputs for current and adjacent rates */
2042 window = tbl->tpc_win;
2043 sr = window[cur].success_ratio;
2044 current_tpt = window[cur].average_tpt;
2045 if (weak != TPC_INVALID)
2046 weak_tpt = window[weak].average_tpt;
2047 if (strong != TPC_INVALID)
2048 strong_tpt = window[strong].average_tpt;
2049
2050 IWL_DEBUG_RATE(mvm,
2051 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2052 cur, current_tpt, sr, weak, strong,
2053 weak_tpt, strong_tpt);
2054
2055 action = rs_get_tpc_action(mvm, sr, weak, strong,
2056 current_tpt, weak_tpt, strong_tpt);
2057
2058 /* override actions if we are on the edge */
2059 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2060 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2061 action = TPC_ACTION_STAY;
2062 } else if (strong == TPC_INVALID &&
2063 (action == TPC_ACTION_INCREASE ||
2064 action == TPC_ACTION_NO_RESTIRCTION)) {
2065 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2066 action = TPC_ACTION_STAY;
2067 }
2068
2069 switch (action) {
2070 case TPC_ACTION_DECREASE:
2071 lq_sta->lq.reduced_tpc = weak;
2072 return true;
2073 case TPC_ACTION_INCREASE:
2074 lq_sta->lq.reduced_tpc = strong;
2075 return true;
2076 case TPC_ACTION_NO_RESTIRCTION:
2077 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2078 return true;
2079 case TPC_ACTION_STAY:
2080 /* do nothing */
2081 break;
2082 }
2083 return false;
2084}
2085
2086/*
2087 * Do rate scaling and search for new modulation mode.
2088 */
2089static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2090 struct ieee80211_sta *sta,
2091 struct iwl_lq_sta *lq_sta,
2092 int tid, bool ndp)
2093{
2094 int low = IWL_RATE_INVALID;
2095 int high = IWL_RATE_INVALID;
2096 int index;
2097 struct iwl_rate_scale_data *window = NULL;
2098 int current_tpt = IWL_INVALID_VALUE;
2099 int low_tpt = IWL_INVALID_VALUE;
2100 int high_tpt = IWL_INVALID_VALUE;
2101 u32 fail_count;
2102 enum rs_action scale_action = RS_ACTION_STAY;
2103 u16 rate_mask;
2104 u8 update_lq = 0;
2105 struct iwl_scale_tbl_info *tbl, *tbl1;
2106 u8 active_tbl = 0;
2107 u8 done_search = 0;
2108 u16 high_low;
2109 s32 sr;
2110 u8 prev_agg = lq_sta->is_agg;
2111 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2112 struct rs_rate *rate;
2113
2114 lq_sta->is_agg = !!mvmsta->agg_tids;
2115
2116 /*
2117 * Select rate-scale / modulation-mode table to work with in
2118 * the rest of this function: "search" if searching for better
2119 * modulation mode, or "active" if doing rate scaling within a mode.
2120 */
2121 if (!lq_sta->search_better_tbl)
2122 active_tbl = lq_sta->active_tbl;
2123 else
2124 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2125
2126 tbl = &(lq_sta->lq_info[active_tbl]);
2127 rate = &tbl->rate;
2128
2129 if (prev_agg != lq_sta->is_agg) {
2130 IWL_DEBUG_RATE(mvm,
2131 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2132 prev_agg, lq_sta->is_agg);
2133 rs_set_expected_tpt_table(lq_sta, tbl);
2134 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2135 }
2136
2137 /* current tx rate */
2138 index = rate->index;
2139
2140 /* rates available for this association, and for modulation mode */
2141 rate_mask = rs_get_supported_rates(lq_sta, rate);
2142
2143 if (!(BIT(index) & rate_mask)) {
2144 IWL_ERR(mvm, "Current Rate is not valid\n");
2145 if (lq_sta->search_better_tbl) {
2146 /* revert to active table if search table is not valid*/
2147 rate->type = LQ_NONE;
2148 lq_sta->search_better_tbl = 0;
2149 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2150 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2151 }
2152 return;
2153 }
2154
2155 /* Get expected throughput table and history window for current rate */
2156 if (!tbl->expected_tpt) {
2157 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2158 return;
2159 }
2160
2161 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2162 window = &(tbl->win[index]);
2163
2164 /*
2165 * If there is not enough history to calculate actual average
2166 * throughput, keep analyzing results of more tx frames, without
2167 * changing rate or mode (bypass most of the rest of this function).
2168 * Set up new rate table in uCode only if old rate is not supported
2169 * in current association (use new rate found above).
2170 */
2171 fail_count = window->counter - window->success_counter;
2172 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2173 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2174 IWL_DEBUG_RATE(mvm,
2175 "%s: Test Window: succ %d total %d\n",
2176 rs_pretty_rate(rate),
2177 window->success_counter, window->counter);
2178
2179 /* Can't calculate this yet; not enough history */
2180 window->average_tpt = IWL_INVALID_VALUE;
2181
2182 /* Should we stay with this modulation mode,
2183 * or search for a new one? */
2184 rs_stay_in_table(lq_sta, false);
2185
2186 return;
2187 }
2188
2189 /* If we are searching for better modulation mode, check success. */
2190 if (lq_sta->search_better_tbl) {
2191 /* If good success, continue using the "search" mode;
2192 * no need to send new link quality command, since we're
2193 * continuing to use the setup that we've been trying. */
2194 if (window->average_tpt > lq_sta->last_tpt) {
2195 IWL_DEBUG_RATE(mvm,
2196 "SWITCHING TO NEW TABLE SR: %d "
2197 "cur-tpt %d old-tpt %d\n",
2198 window->success_ratio,
2199 window->average_tpt,
2200 lq_sta->last_tpt);
2201
2202 /* Swap tables; "search" becomes "active" */
2203 lq_sta->active_tbl = active_tbl;
2204 current_tpt = window->average_tpt;
2205 /* Else poor success; go back to mode in "active" table */
2206 } else {
2207 IWL_DEBUG_RATE(mvm,
2208 "GOING BACK TO THE OLD TABLE: SR %d "
2209 "cur-tpt %d old-tpt %d\n",
2210 window->success_ratio,
2211 window->average_tpt,
2212 lq_sta->last_tpt);
2213
2214 /* Nullify "search" table */
2215 rate->type = LQ_NONE;
2216
2217 /* Revert to "active" table */
2218 active_tbl = lq_sta->active_tbl;
2219 tbl = &(lq_sta->lq_info[active_tbl]);
2220
2221 /* Revert to "active" rate and throughput info */
2222 index = tbl->rate.index;
2223 current_tpt = lq_sta->last_tpt;
2224
2225 /* Need to set up a new rate table in uCode */
2226 update_lq = 1;
2227 }
2228
2229 /* Either way, we've made a decision; modulation mode
2230 * search is done, allow rate adjustment next time. */
2231 lq_sta->search_better_tbl = 0;
2232 done_search = 1; /* Don't switch modes below! */
2233 goto lq_update;
2234 }
2235
2236 /* (Else) not in search of better modulation mode, try for better
2237 * starting rate, while staying in this mode. */
2238 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2239 low = high_low & 0xff;
2240 high = (high_low >> 8) & 0xff;
2241
2242 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2243
2244 sr = window->success_ratio;
2245
2246 /* Collect measured throughputs for current and adjacent rates */
2247 current_tpt = window->average_tpt;
2248 if (low != IWL_RATE_INVALID)
2249 low_tpt = tbl->win[low].average_tpt;
2250 if (high != IWL_RATE_INVALID)
2251 high_tpt = tbl->win[high].average_tpt;
2252
2253 IWL_DEBUG_RATE(mvm,
2254 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2255 rs_pretty_rate(rate), current_tpt, sr,
2256 low, high, low_tpt, high_tpt);
2257
2258 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2259 current_tpt, low_tpt, high_tpt);
2260
2261 /* Force a search in case BT doesn't like us being in MIMO */
2262 if (is_mimo(rate) &&
2263 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2264 IWL_DEBUG_RATE(mvm,
2265 "BT Coex forbids MIMO. Search for new config\n");
2266 rs_stay_in_table(lq_sta, true);
2267 goto lq_update;
2268 }
2269
2270 switch (scale_action) {
2271 case RS_ACTION_DOWNSCALE:
2272 /* Decrease starting rate, update uCode's rate table */
2273 if (low != IWL_RATE_INVALID) {
2274 update_lq = 1;
2275 index = low;
2276 } else {
2277 IWL_DEBUG_RATE(mvm,
2278 "At the bottom rate. Can't decrease\n");
2279 }
2280
2281 break;
2282 case RS_ACTION_UPSCALE:
2283 /* Increase starting rate, update uCode's rate table */
2284 if (high != IWL_RATE_INVALID) {
2285 update_lq = 1;
2286 index = high;
2287 } else {
2288 IWL_DEBUG_RATE(mvm,
2289 "At the top rate. Can't increase\n");
2290 }
2291
2292 break;
2293 case RS_ACTION_STAY:
2294 /* No change */
2295 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2296 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2297 break;
2298 default:
2299 break;
2300 }
2301
2302lq_update:
2303 /* Replace uCode's rate table for the destination station. */
2304 if (update_lq) {
2305 tbl->rate.index = index;
2306 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2307 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2308 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2309 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2310 }
2311
2312 rs_stay_in_table(lq_sta, false);
2313
2314 /*
2315 * Search for new modulation mode if we're:
2316 * 1) Not changing rates right now
2317 * 2) Not just finishing up a search
2318 * 3) Allowing a new search
2319 */
2320 if (!update_lq && !done_search &&
2321 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2322 && window->counter) {
2323 enum rs_column next_column;
2324
2325 /* Save current throughput to compare with "search" throughput*/
2326 lq_sta->last_tpt = current_tpt;
2327
2328 IWL_DEBUG_RATE(mvm,
2329 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2330 update_lq, done_search, lq_sta->rs_state,
2331 window->counter);
2332
2333 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2334 if (next_column != RS_COLUMN_INVALID) {
2335 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2336 next_column);
2337 if (!ret)
2338 lq_sta->search_better_tbl = 1;
2339 } else {
2340 IWL_DEBUG_RATE(mvm,
2341 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2342 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2343 }
2344
2345 /* If new "search" mode was selected, set up in uCode table */
2346 if (lq_sta->search_better_tbl) {
2347 /* Access the "search" table, clear its history. */
2348 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2349 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2350
2351 /* Use new "search" start rate */
2352 index = tbl->rate.index;
2353
2354 rs_dump_rate(mvm, &tbl->rate,
2355 "Switch to SEARCH TABLE:");
2356 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2357 } else {
2358 done_search = 1;
2359 }
2360 }
2361
2362 if (!ndp)
2363 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2364
2365 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2366 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2367 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2368 }
2369}
2370
2371struct rs_init_rate_info {
2372 s8 rssi;
2373 u8 rate_idx;
2374};
2375
2376static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2377 { -60, IWL_RATE_54M_INDEX },
2378 { -64, IWL_RATE_48M_INDEX },
2379 { -68, IWL_RATE_36M_INDEX },
2380 { -80, IWL_RATE_24M_INDEX },
2381 { -84, IWL_RATE_18M_INDEX },
2382 { -85, IWL_RATE_12M_INDEX },
2383 { -86, IWL_RATE_11M_INDEX },
2384 { -88, IWL_RATE_5M_INDEX },
2385 { -90, IWL_RATE_2M_INDEX },
2386 { S8_MIN, IWL_RATE_1M_INDEX },
2387};
2388
2389static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2390 { -60, IWL_RATE_54M_INDEX },
2391 { -64, IWL_RATE_48M_INDEX },
2392 { -72, IWL_RATE_36M_INDEX },
2393 { -80, IWL_RATE_24M_INDEX },
2394 { -84, IWL_RATE_18M_INDEX },
2395 { -85, IWL_RATE_12M_INDEX },
2396 { -87, IWL_RATE_9M_INDEX },
2397 { S8_MIN, IWL_RATE_6M_INDEX },
2398};
2399
2400static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2401 { -60, IWL_RATE_MCS_7_INDEX },
2402 { -64, IWL_RATE_MCS_6_INDEX },
2403 { -68, IWL_RATE_MCS_5_INDEX },
2404 { -72, IWL_RATE_MCS_4_INDEX },
2405 { -80, IWL_RATE_MCS_3_INDEX },
2406 { -84, IWL_RATE_MCS_2_INDEX },
2407 { -85, IWL_RATE_MCS_1_INDEX },
2408 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2409};
2410
2411/* MCS index 9 is not valid for 20MHz VHT channel width,
2412 * but is ok for 40, 80 and 160MHz channels.
2413 */
2414static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2415 { -60, IWL_RATE_MCS_8_INDEX },
2416 { -64, IWL_RATE_MCS_7_INDEX },
2417 { -68, IWL_RATE_MCS_6_INDEX },
2418 { -72, IWL_RATE_MCS_5_INDEX },
2419 { -80, IWL_RATE_MCS_4_INDEX },
2420 { -84, IWL_RATE_MCS_3_INDEX },
2421 { -85, IWL_RATE_MCS_2_INDEX },
2422 { -87, IWL_RATE_MCS_1_INDEX },
2423 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2424};
2425
2426static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2427 { -60, IWL_RATE_MCS_9_INDEX },
2428 { -64, IWL_RATE_MCS_8_INDEX },
2429 { -68, IWL_RATE_MCS_7_INDEX },
2430 { -72, IWL_RATE_MCS_6_INDEX },
2431 { -80, IWL_RATE_MCS_5_INDEX },
2432 { -84, IWL_RATE_MCS_4_INDEX },
2433 { -85, IWL_RATE_MCS_3_INDEX },
2434 { -87, IWL_RATE_MCS_2_INDEX },
2435 { -88, IWL_RATE_MCS_1_INDEX },
2436 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2437};
2438
2439#define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2440
2441/* Init the optimal rate based on STA caps
2442 * This combined with rssi is used to report the last tx rate
2443 * to userspace when we haven't transmitted enough frames.
2444 */
2445static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2446 struct ieee80211_sta *sta,
2447 struct iwl_lq_sta *lq_sta)
2448{
2449 struct rs_rate *rate = &lq_sta->optimal_rate;
2450
2451 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2452 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2453 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2454 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2455 else if (lq_sta->band == NL80211_BAND_5GHZ)
2456 rate->type = LQ_LEGACY_A;
2457 else
2458 rate->type = LQ_LEGACY_G;
2459
2460 rate->bw = rs_bw_from_sta_bw(sta);
2461 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2462
2463 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2464
2465 if (is_mimo(rate)) {
2466 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2467 } else if (is_siso(rate)) {
2468 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2469 } else {
2470 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2471
2472 if (lq_sta->band == NL80211_BAND_5GHZ) {
2473 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2474 lq_sta->optimal_nentries =
2475 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2476 } else {
2477 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2478 lq_sta->optimal_nentries =
2479 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2480 }
2481 }
2482
2483 if (is_vht(rate)) {
2484 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2485 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2486 lq_sta->optimal_nentries =
2487 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2488 } else {
2489 lq_sta->optimal_rates = rs_optimal_rates_vht;
2490 lq_sta->optimal_nentries =
2491 ARRAY_SIZE(rs_optimal_rates_vht);
2492 }
2493 } else if (is_ht(rate)) {
2494 lq_sta->optimal_rates = rs_optimal_rates_ht;
2495 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2496 }
2497}
2498
2499/* Compute the optimal rate index based on RSSI */
2500static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2501 struct iwl_lq_sta *lq_sta)
2502{
2503 struct rs_rate *rate = &lq_sta->optimal_rate;
2504 int i;
2505
2506 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2507 BITS_PER_LONG);
2508
2509 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2510 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2511
2512 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2513 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2514 rate->index = rate_idx;
2515 break;
2516 }
2517 }
2518
2519 return rate;
2520}
2521
2522/* Choose an initial legacy rate and antenna to use based on the RSSI
2523 * of last Rx
2524 */
2525static void rs_get_initial_rate(struct iwl_mvm *mvm,
2526 struct ieee80211_sta *sta,
2527 struct iwl_lq_sta *lq_sta,
2528 enum nl80211_band band,
2529 struct rs_rate *rate)
2530{
2531 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2532 int i, nentries;
2533 unsigned long active_rate;
2534 s8 best_rssi = S8_MIN;
2535 u8 best_ant = ANT_NONE;
2536 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2537 const struct rs_init_rate_info *initial_rates;
2538
2539 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2540 if (!(lq_sta->pers.chains & BIT(i)))
2541 continue;
2542
2543 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2544 best_rssi = lq_sta->pers.chain_signal[i];
2545 best_ant = BIT(i);
2546 }
2547 }
2548
2549 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2550 rs_pretty_ant(best_ant), best_rssi);
2551
2552 if (best_ant != ANT_A && best_ant != ANT_B)
2553 rate->ant = first_antenna(valid_tx_ant);
2554 else
2555 rate->ant = best_ant;
2556
2557 rate->sgi = false;
2558 rate->ldpc = false;
2559 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2560
2561 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2562 BITS_PER_LONG);
2563
2564 if (band == NL80211_BAND_5GHZ) {
2565 rate->type = LQ_LEGACY_A;
2566 initial_rates = rs_optimal_rates_5ghz_legacy;
2567 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2568 } else {
2569 rate->type = LQ_LEGACY_G;
2570 initial_rates = rs_optimal_rates_24ghz_legacy;
2571 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2572 }
2573
2574 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2575 goto out;
2576
2577 /* Start from a higher rate if the corresponding debug capability
2578 * is enabled. The rate is chosen according to AP capabilities.
2579 * In case of VHT/HT when the rssi is low fallback to the case of
2580 * legacy rates.
2581 */
2582 if (sta->vht_cap.vht_supported &&
2583 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2584 /*
2585 * In AP mode, when a new station associates, rs is initialized
2586 * immediately upon association completion, before the phy
2587 * context is updated with the association parameters, so the
2588 * sta bandwidth might be wider than the phy context allows.
2589 * To avoid this issue, always initialize rs with 20mhz
2590 * bandwidth rate, and after authorization, when the phy context
2591 * is already up-to-date, re-init rs with the correct bw.
2592 */
2593 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2594 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2595
2596 switch (bw) {
2597 case RATE_MCS_CHAN_WIDTH_40:
2598 case RATE_MCS_CHAN_WIDTH_80:
2599 case RATE_MCS_CHAN_WIDTH_160:
2600 initial_rates = rs_optimal_rates_vht;
2601 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2602 break;
2603 case RATE_MCS_CHAN_WIDTH_20:
2604 initial_rates = rs_optimal_rates_vht_20mhz;
2605 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2606 break;
2607 default:
2608 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2609 goto out;
2610 }
2611
2612 active_rate = lq_sta->active_siso_rate;
2613 rate->type = LQ_VHT_SISO;
2614 rate->bw = bw;
2615 } else if (sta->ht_cap.ht_supported &&
2616 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2617 initial_rates = rs_optimal_rates_ht;
2618 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2619 active_rate = lq_sta->active_siso_rate;
2620 rate->type = LQ_HT_SISO;
2621 } else {
2622 active_rate = lq_sta->active_legacy_rate;
2623 }
2624
2625 for (i = 0; i < nentries; i++) {
2626 int rate_idx = initial_rates[i].rate_idx;
2627
2628 if ((best_rssi >= initial_rates[i].rssi) &&
2629 (BIT(rate_idx) & active_rate)) {
2630 rate->index = rate_idx;
2631 break;
2632 }
2633 }
2634
2635out:
2636 rs_dump_rate(mvm, rate, "INITIAL");
2637}
2638
2639/* Save info about RSSI of last Rx */
2640void rs_update_last_rssi(struct iwl_mvm *mvm,
2641 struct iwl_mvm_sta *mvmsta,
2642 struct ieee80211_rx_status *rx_status)
2643{
2644 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2645 int i;
2646
2647 lq_sta->pers.chains = rx_status->chains;
2648 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2649 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2650 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2651 lq_sta->pers.last_rssi = S8_MIN;
2652
2653 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2654 if (!(lq_sta->pers.chains & BIT(i)))
2655 continue;
2656
2657 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2658 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2659 }
2660}
2661
2662/**
2663 * rs_initialize_lq - Initialize a station's hardware rate table
2664 *
2665 * The uCode's station table contains a table of fallback rates
2666 * for automatic fallback during transmission.
2667 *
2668 * NOTE: This sets up a default set of values. These will be replaced later
2669 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2670 * rc80211_simple.
2671 *
2672 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2673 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2674 * which requires station table entry to exist).
2675 */
2676static void rs_initialize_lq(struct iwl_mvm *mvm,
2677 struct ieee80211_sta *sta,
2678 struct iwl_lq_sta *lq_sta,
2679 enum nl80211_band band)
2680{
2681 struct iwl_scale_tbl_info *tbl;
2682 struct rs_rate *rate;
2683 u8 active_tbl = 0;
2684
2685 if (!sta || !lq_sta)
2686 return;
2687
2688 if (!lq_sta->search_better_tbl)
2689 active_tbl = lq_sta->active_tbl;
2690 else
2691 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2692
2693 tbl = &(lq_sta->lq_info[active_tbl]);
2694 rate = &tbl->rate;
2695
2696 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2697 rs_init_optimal_rate(mvm, sta, lq_sta);
2698
2699 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2700 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2701 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2702 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2703
2704 tbl->column = rs_get_column_from_rate(rate);
2705
2706 rs_set_expected_tpt_table(lq_sta, tbl);
2707 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2708 /* TODO restore station should remember the lq cmd */
2709 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2710}
2711
2712static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2713 void *mvm_sta,
2714 struct ieee80211_tx_rate_control *txrc)
2715{
2716 struct iwl_op_mode *op_mode = mvm_r;
2717 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2718 struct sk_buff *skb = txrc->skb;
2719 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2720 struct iwl_lq_sta *lq_sta;
2721 struct rs_rate *optimal_rate;
2722 u32 last_ucode_rate;
2723
2724 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2725 /* if vif isn't initialized mvm doesn't know about
2726 * this station, so don't do anything with the it
2727 */
2728 sta = NULL;
2729 mvm_sta = NULL;
2730 }
2731
2732 if (!mvm_sta)
2733 return;
2734
2735 lq_sta = mvm_sta;
2736 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2737 info->band, &info->control.rates[0]);
2738 info->control.rates[0].count = 1;
2739
2740 /* Report the optimal rate based on rssi and STA caps if we haven't
2741 * converged yet (too little traffic) or exploring other modulations
2742 */
2743 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2744 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2745 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2746 optimal_rate);
2747 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2748 &txrc->reported_rate);
2749 }
2750}
2751
2752static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2753 gfp_t gfp)
2754{
2755 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2756 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2757 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2758 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2759
2760 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2761
2762 lq_sta->pers.drv = mvm;
2763#ifdef CONFIG_MAC80211_DEBUGFS
2764 lq_sta->pers.dbg_fixed_rate = 0;
2765 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2766 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2767#endif
2768 lq_sta->pers.chains = 0;
2769 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2770 lq_sta->pers.last_rssi = S8_MIN;
2771
2772 return lq_sta;
2773}
2774
2775static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2776 int nss)
2777{
2778 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2779 (0x3 << (2 * (nss - 1)));
2780 rx_mcs >>= (2 * (nss - 1));
2781
2782 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2783 return IWL_RATE_MCS_7_INDEX;
2784 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2785 return IWL_RATE_MCS_8_INDEX;
2786 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2787 return IWL_RATE_MCS_9_INDEX;
2788
2789 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2790 return -1;
2791}
2792
2793static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2794 struct ieee80211_sta_vht_cap *vht_cap,
2795 struct iwl_lq_sta *lq_sta)
2796{
2797 int i;
2798 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2799
2800 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2801 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2802 if (i == IWL_RATE_9M_INDEX)
2803 continue;
2804
2805 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2806 if (i == IWL_RATE_MCS_9_INDEX &&
2807 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2808 continue;
2809
2810 lq_sta->active_siso_rate |= BIT(i);
2811 }
2812 }
2813
2814 if (sta->rx_nss < 2)
2815 return;
2816
2817 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2818 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2819 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2820 if (i == IWL_RATE_9M_INDEX)
2821 continue;
2822
2823 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2824 if (i == IWL_RATE_MCS_9_INDEX &&
2825 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2826 continue;
2827
2828 lq_sta->active_mimo2_rate |= BIT(i);
2829 }
2830 }
2831}
2832
2833static void rs_ht_init(struct iwl_mvm *mvm,
2834 struct ieee80211_sta *sta,
2835 struct iwl_lq_sta *lq_sta,
2836 struct ieee80211_sta_ht_cap *ht_cap)
2837{
2838 /* active_siso_rate mask includes 9 MBits (bit 5),
2839 * and CCK (bits 0-3), supp_rates[] does not;
2840 * shift to convert format, force 9 MBits off.
2841 */
2842 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2843 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2844 lq_sta->active_siso_rate &= ~((u16)0x2);
2845 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2846
2847 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2848 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2849 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2850 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2851
2852 if (mvm->cfg->ht_params->ldpc &&
2853 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2854 lq_sta->ldpc = true;
2855
2856 if (mvm->cfg->ht_params->stbc &&
2857 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2858 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2859 lq_sta->stbc_capable = true;
2860
2861 lq_sta->is_vht = false;
2862}
2863
2864static void rs_vht_init(struct iwl_mvm *mvm,
2865 struct ieee80211_sta *sta,
2866 struct iwl_lq_sta *lq_sta,
2867 struct ieee80211_sta_vht_cap *vht_cap)
2868{
2869 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2870
2871 if (mvm->cfg->ht_params->ldpc &&
2872 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2873 lq_sta->ldpc = true;
2874
2875 if (mvm->cfg->ht_params->stbc &&
2876 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2877 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2878 lq_sta->stbc_capable = true;
2879
2880 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2881 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2882 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2883 lq_sta->bfer_capable = true;
2884
2885 lq_sta->is_vht = true;
2886}
2887
2888#ifdef CONFIG_IWLWIFI_DEBUGFS
2889void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2890{
2891 spin_lock_bh(&mvm->drv_stats_lock);
2892 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2893 spin_unlock_bh(&mvm->drv_stats_lock);
2894}
2895
2896void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2897{
2898 u8 nss = 0;
2899
2900 spin_lock(&mvm->drv_stats_lock);
2901
2902 if (agg)
2903 mvm->drv_rx_stats.agg_frames++;
2904
2905 mvm->drv_rx_stats.success_frames++;
2906
2907 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2908 case RATE_MCS_CHAN_WIDTH_20:
2909 mvm->drv_rx_stats.bw_20_frames++;
2910 break;
2911 case RATE_MCS_CHAN_WIDTH_40:
2912 mvm->drv_rx_stats.bw_40_frames++;
2913 break;
2914 case RATE_MCS_CHAN_WIDTH_80:
2915 mvm->drv_rx_stats.bw_80_frames++;
2916 break;
2917 case RATE_MCS_CHAN_WIDTH_160:
2918 mvm->drv_rx_stats.bw_160_frames++;
2919 break;
2920 default:
2921 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2922 }
2923
2924 if (rate & RATE_MCS_HT_MSK) {
2925 mvm->drv_rx_stats.ht_frames++;
2926 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2927 } else if (rate & RATE_MCS_VHT_MSK) {
2928 mvm->drv_rx_stats.vht_frames++;
2929 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2930 RATE_VHT_MCS_NSS_POS) + 1;
2931 } else {
2932 mvm->drv_rx_stats.legacy_frames++;
2933 }
2934
2935 if (nss == 1)
2936 mvm->drv_rx_stats.siso_frames++;
2937 else if (nss == 2)
2938 mvm->drv_rx_stats.mimo2_frames++;
2939
2940 if (rate & RATE_MCS_SGI_MSK)
2941 mvm->drv_rx_stats.sgi_frames++;
2942 else
2943 mvm->drv_rx_stats.ngi_frames++;
2944
2945 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2946 mvm->drv_rx_stats.last_frame_idx =
2947 (mvm->drv_rx_stats.last_frame_idx + 1) %
2948 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2949
2950 spin_unlock(&mvm->drv_stats_lock);
2951}
2952#endif
2953
2954/*
2955 * Called after adding a new station to initialize rate scaling
2956 */
2957static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2958 enum nl80211_band band)
2959{
2960 int i, j;
2961 struct ieee80211_hw *hw = mvm->hw;
2962 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2963 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2964 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2965 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2966 struct ieee80211_supported_band *sband;
2967 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2968
2969 lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock);
2970
2971 /* clear all non-persistent lq data */
2972 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2973
2974 sband = hw->wiphy->bands[band];
2975
2976 lq_sta->lq.sta_id = mvmsta->sta_id;
2977 mvmsta->amsdu_enabled = 0;
2978 mvmsta->max_amsdu_len = sta->max_amsdu_len;
2979
2980 for (j = 0; j < LQ_SIZE; j++)
2981 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2982
2983 lq_sta->flush_timer = 0;
2984 lq_sta->last_tx = jiffies;
2985
2986 IWL_DEBUG_RATE(mvm,
2987 "LQ: *** rate scale station global init for station %d ***\n",
2988 mvmsta->sta_id);
2989 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2990 * the lowest or the highest rate.. Could consider using RSSI from
2991 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2992 * after assoc.. */
2993
2994 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2995 lq_sta->band = sband->band;
2996 /*
2997 * active legacy rates as per supported rates bitmap
2998 */
2999 supp = sta->supp_rates[sband->band];
3000 lq_sta->active_legacy_rate = 0;
3001 for_each_set_bit(i, &supp, BITS_PER_LONG)
3002 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3003
3004 /* TODO: should probably account for rx_highest for both HT/VHT */
3005 if (!vht_cap || !vht_cap->vht_supported)
3006 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3007 else
3008 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3009
3010 lq_sta->max_legacy_rate_idx =
3011 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3012 lq_sta->max_siso_rate_idx =
3013 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3014 lq_sta->max_mimo2_rate_idx =
3015 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3016
3017 IWL_DEBUG_RATE(mvm,
3018 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3019 lq_sta->active_legacy_rate,
3020 lq_sta->active_siso_rate,
3021 lq_sta->active_mimo2_rate,
3022 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3023 lq_sta->bfer_capable);
3024 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3025 lq_sta->max_legacy_rate_idx,
3026 lq_sta->max_siso_rate_idx,
3027 lq_sta->max_mimo2_rate_idx);
3028
3029 /* These values will be overridden later */
3030 lq_sta->lq.single_stream_ant_msk =
3031 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
3032 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3033
3034 /* as default allow aggregation for all tids */
3035 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3036 lq_sta->is_agg = 0;
3037#ifdef CONFIG_IWLWIFI_DEBUGFS
3038 iwl_mvm_reset_frame_stats(mvm);
3039#endif
3040 rs_initialize_lq(mvm, sta, lq_sta, band);
3041}
3042
3043static void rs_drv_rate_update(void *mvm_r,
3044 struct ieee80211_supported_band *sband,
3045 struct cfg80211_chan_def *chandef,
3046 struct ieee80211_sta *sta,
3047 void *priv_sta, u32 changed)
3048{
3049 struct iwl_op_mode *op_mode = mvm_r;
3050 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3051 u8 tid;
3052
3053 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3054 return;
3055
3056 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3057 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3058 ieee80211_stop_tx_ba_session(sta, tid);
3059
3060 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3061}
3062
3063static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3064 struct ieee80211_sta *sta,
3065 int tid, struct ieee80211_tx_info *info,
3066 bool ndp)
3067{
3068 int legacy_success;
3069 int retries;
3070 int i;
3071 struct iwl_lq_cmd *table;
3072 u32 lq_hwrate;
3073 struct rs_rate lq_rate, tx_resp_rate;
3074 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3075 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3076 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3077 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3078 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3079 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3080 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3081
3082 if (!lq_sta->pers.drv) {
3083 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3084 return;
3085 }
3086
3087 /* This packet was aggregated but doesn't carry status info */
3088 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3089 !(info->flags & IEEE80211_TX_STAT_AMPDU))
3090 return;
3091
3092 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3093 &tx_resp_rate)) {
3094 WARN_ON_ONCE(1);
3095 return;
3096 }
3097
3098#ifdef CONFIG_MAC80211_DEBUGFS
3099 /* Disable last tx check if we are debugging with fixed rate but
3100 * update tx stats
3101 */
3102 if (lq_sta->pers.dbg_fixed_rate) {
3103 int index = tx_resp_rate.index;
3104 enum rs_column column;
3105 int attempts, success;
3106
3107 column = rs_get_column_from_rate(&tx_resp_rate);
3108 if (WARN_ONCE(column == RS_COLUMN_INVALID,
3109 "Can't map rate 0x%x to column",
3110 tx_resp_hwrate))
3111 return;
3112
3113 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3114 attempts = info->status.ampdu_len;
3115 success = info->status.ampdu_ack_len;
3116 } else {
3117 attempts = info->status.rates[0].count;
3118 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3119 }
3120
3121 lq_sta->pers.tx_stats[column][index].total += attempts;
3122 lq_sta->pers.tx_stats[column][index].success += success;
3123
3124 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3125 tx_resp_hwrate, success, attempts);
3126 return;
3127 }
3128#endif
3129
3130 if (time_after(jiffies,
3131 (unsigned long)(lq_sta->last_tx +
3132 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3133 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3134 /* reach here only in case of driver RS, call directly
3135 * the unlocked version
3136 */
3137 rs_drv_rate_init(mvm, sta, info->band);
3138 return;
3139 }
3140 lq_sta->last_tx = jiffies;
3141
3142 /* Ignore this Tx frame response if its initial rate doesn't match
3143 * that of latest Link Quality command. There may be stragglers
3144 * from a previous Link Quality command, but we're no longer interested
3145 * in those; they're either from the "active" mode while we're trying
3146 * to check "search" mode, or a prior "search" mode after we've moved
3147 * to a new "search" mode (which might become the new "active" mode).
3148 */
3149 table = &lq_sta->lq;
3150 lq_hwrate = le32_to_cpu(table->rs_table[0]);
3151 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3152 WARN_ON_ONCE(1);
3153 return;
3154 }
3155
3156 /* Here we actually compare this rate to the latest LQ command */
3157 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3158 IWL_DEBUG_RATE(mvm,
3159 "tx resp color 0x%x does not match 0x%x\n",
3160 lq_color, LQ_FLAG_COLOR_GET(table->flags));
3161
3162 /* Since rates mis-match, the last LQ command may have failed.
3163 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3164 * ... driver.
3165 */
3166 lq_sta->missed_rate_counter++;
3167 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3168 lq_sta->missed_rate_counter = 0;
3169 IWL_DEBUG_RATE(mvm,
3170 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3171 lq_sta->rs_state);
3172 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3173 }
3174 /* Regardless, ignore this status info for outdated rate */
3175 return;
3176 }
3177
3178 /* Rate did match, so reset the missed_rate_counter */
3179 lq_sta->missed_rate_counter = 0;
3180
3181 if (!lq_sta->search_better_tbl) {
3182 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3183 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3184 } else {
3185 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3186 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3187 }
3188
3189 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3190 IWL_DEBUG_RATE(mvm,
3191 "Neither active nor search matches tx rate\n");
3192 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3193 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3194 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3195 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3196 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3197
3198 /* no matching table found, let's by-pass the data collection
3199 * and continue to perform rate scale to find the rate table
3200 */
3201 rs_stay_in_table(lq_sta, true);
3202 goto done;
3203 }
3204
3205 /* Updating the frame history depends on whether packets were
3206 * aggregated.
3207 *
3208 * For aggregation, all packets were transmitted at the same rate, the
3209 * first index into rate scale table.
3210 */
3211 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3212 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3213 info->status.ampdu_len,
3214 info->status.ampdu_ack_len,
3215 reduced_txp);
3216
3217 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3218 * it as a single frame loss as we don't want the success ratio
3219 * to dip too quickly because a BA wasn't received.
3220 * For TPC, there's no need for this optimisation since we want
3221 * to recover very quickly from a bad power reduction and,
3222 * therefore we'd like the success ratio to get an immediate hit
3223 * when failing to get a BA, so we'd switch back to a lower or
3224 * zero power reduction. When FW transmits agg with a rate
3225 * different from the initial rate, it will not use reduced txp
3226 * and will send BA notification twice (one empty with reduced
3227 * txp equal to the value from LQ and one with reduced txp 0).
3228 * We need to update counters for each txp level accordingly.
3229 */
3230 if (info->status.ampdu_ack_len == 0)
3231 info->status.ampdu_len = 1;
3232
3233 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3234 tx_resp_rate.index,
3235 info->status.ampdu_len,
3236 info->status.ampdu_ack_len);
3237
3238 /* Update success/fail counts if not searching for new mode */
3239 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3240 lq_sta->total_success += info->status.ampdu_ack_len;
3241 lq_sta->total_failed += (info->status.ampdu_len -
3242 info->status.ampdu_ack_len);
3243 }
3244 } else {
3245 /* For legacy, update frame history with for each Tx retry. */
3246 retries = info->status.rates[0].count - 1;
3247 /* HW doesn't send more than 15 retries */
3248 retries = min(retries, 15);
3249
3250 /* The last transmission may have been successful */
3251 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3252 /* Collect data for each rate used during failed TX attempts */
3253 for (i = 0; i <= retries; ++i) {
3254 lq_hwrate = le32_to_cpu(table->rs_table[i]);
3255 if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3256 &lq_rate)) {
3257 WARN_ON_ONCE(1);
3258 return;
3259 }
3260
3261 /* Only collect stats if retried rate is in the same RS
3262 * table as active/search.
3263 */
3264 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3265 tmp_tbl = curr_tbl;
3266 else if (rs_rate_column_match(&lq_rate,
3267 &other_tbl->rate))
3268 tmp_tbl = other_tbl;
3269 else
3270 continue;
3271
3272 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3273 tx_resp_rate.index, 1,
3274 i < retries ? 0 : legacy_success,
3275 reduced_txp);
3276 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3277 tx_resp_rate.index, 1,
3278 i < retries ? 0 : legacy_success);
3279 }
3280
3281 /* Update success/fail counts if not searching for new mode */
3282 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3283 lq_sta->total_success += legacy_success;
3284 lq_sta->total_failed += retries + (1 - legacy_success);
3285 }
3286 }
3287 /* The last TX rate is cached in lq_sta; it's set in if/else above */
3288 lq_sta->last_rate_n_flags = lq_hwrate;
3289 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3290done:
3291 /* See if there's a better rate or modulation mode to try. */
3292 if (sta->supp_rates[info->band])
3293 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3294}
3295
3296void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3297 int tid, struct ieee80211_tx_info *info, bool ndp)
3298{
3299 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3300
3301 /* If it's locked we are in middle of init flow
3302 * just wait for next tx status to update the lq_sta data
3303 */
3304 if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock))
3305 return;
3306
3307 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3308 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
3309}
3310
3311#ifdef CONFIG_MAC80211_DEBUGFS
3312static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3313 struct iwl_lq_cmd *lq_cmd,
3314 enum nl80211_band band,
3315 u32 ucode_rate)
3316{
3317 struct rs_rate rate;
3318 int i;
3319 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3320 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3321 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3322
3323 for (i = 0; i < num_rates; i++)
3324 lq_cmd->rs_table[i] = ucode_rate_le32;
3325
3326 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3327 WARN_ON_ONCE(1);
3328 return;
3329 }
3330
3331 if (is_mimo(&rate))
3332 lq_cmd->mimo_delim = num_rates - 1;
3333 else
3334 lq_cmd->mimo_delim = 0;
3335
3336 lq_cmd->reduced_tpc = 0;
3337
3338 if (num_of_ant(ant) == 1)
3339 lq_cmd->single_stream_ant_msk = ant;
3340
3341 if (!mvm->trans->trans_cfg->gen2)
3342 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3343 else
3344 lq_cmd->agg_frame_cnt_limit =
3345 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3346}
3347#endif /* CONFIG_MAC80211_DEBUGFS */
3348
3349static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3350 struct iwl_lq_sta *lq_sta,
3351 struct rs_rate *rate,
3352 __le32 *rs_table, int *rs_table_index,
3353 int num_rates, int num_retries,
3354 u8 valid_tx_ant, bool toggle_ant)
3355{
3356 int i, j;
3357 __le32 ucode_rate;
3358 bool bottom_reached = false;
3359 int prev_rate_idx = rate->index;
3360 int end = LINK_QUAL_MAX_RETRY_NUM;
3361 int index = *rs_table_index;
3362
3363 for (i = 0; i < num_rates && index < end; i++) {
3364 for (j = 0; j < num_retries && index < end; j++, index++) {
3365 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3366 rate));
3367 rs_table[index] = ucode_rate;
3368 if (toggle_ant)
3369 rs_toggle_antenna(valid_tx_ant, rate);
3370 }
3371
3372 prev_rate_idx = rate->index;
3373 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3374 if (bottom_reached && !is_legacy(rate))
3375 break;
3376 }
3377
3378 if (!bottom_reached && !is_legacy(rate))
3379 rate->index = prev_rate_idx;
3380
3381 *rs_table_index = index;
3382}
3383
3384/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3385 * column the rate table should look like this:
3386 *
3387 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3388 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3389 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3390 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3391 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3392 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3393 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3394 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3395 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3396 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3397 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3398 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3399 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3400 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3401 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3402 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3403 */
3404static void rs_build_rates_table(struct iwl_mvm *mvm,
3405 struct ieee80211_sta *sta,
3406 struct iwl_lq_sta *lq_sta,
3407 const struct rs_rate *initial_rate)
3408{
3409 struct rs_rate rate;
3410 int num_rates, num_retries, index = 0;
3411 u8 valid_tx_ant = 0;
3412 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3413 bool toggle_ant = false;
3414 u32 color;
3415
3416 memcpy(&rate, initial_rate, sizeof(rate));
3417
3418 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3419
3420 /* TODO: remove old API when min FW API hits 14 */
3421 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3422 rs_stbc_allow(mvm, sta, lq_sta))
3423 rate.stbc = true;
3424
3425 if (is_siso(&rate)) {
3426 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3427 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3428 } else if (is_mimo(&rate)) {
3429 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3430 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3431 } else {
3432 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3433 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3434 toggle_ant = true;
3435 }
3436
3437 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3438 num_rates, num_retries, valid_tx_ant,
3439 toggle_ant);
3440
3441 rs_get_lower_rate_down_column(lq_sta, &rate);
3442
3443 if (is_siso(&rate)) {
3444 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3445 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3446 lq_cmd->mimo_delim = index;
3447 } else if (is_legacy(&rate)) {
3448 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3449 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3450 } else {
3451 WARN_ON_ONCE(1);
3452 }
3453
3454 toggle_ant = true;
3455
3456 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3457 num_rates, num_retries, valid_tx_ant,
3458 toggle_ant);
3459
3460 rs_get_lower_rate_down_column(lq_sta, &rate);
3461
3462 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3463 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3464
3465 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3466 num_rates, num_retries, valid_tx_ant,
3467 toggle_ant);
3468
3469 /* update the color of the LQ command (as a counter at bits 1-3) */
3470 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3471 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3472}
3473
3474struct rs_bfer_active_iter_data {
3475 struct ieee80211_sta *exclude_sta;
3476 struct iwl_mvm_sta *bfer_mvmsta;
3477};
3478
3479static void rs_bfer_active_iter(void *_data,
3480 struct ieee80211_sta *sta)
3481{
3482 struct rs_bfer_active_iter_data *data = _data;
3483 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3484 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3485 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3486
3487 if (sta == data->exclude_sta)
3488 return;
3489
3490 /* The current sta has BFER allowed */
3491 if (ss_params & LQ_SS_BFER_ALLOWED) {
3492 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3493
3494 data->bfer_mvmsta = mvmsta;
3495 }
3496}
3497
3498static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3499{
3500 int prio = -1;
3501 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3502
3503 switch (viftype) {
3504 case NL80211_IFTYPE_AP:
3505 case NL80211_IFTYPE_P2P_GO:
3506 prio = 3;
3507 break;
3508 case NL80211_IFTYPE_P2P_CLIENT:
3509 prio = 2;
3510 break;
3511 case NL80211_IFTYPE_STATION:
3512 prio = 1;
3513 break;
3514 default:
3515 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3516 prio = -1;
3517 }
3518
3519 return prio;
3520}
3521
3522/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3523static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3524 struct iwl_mvm_sta *sta2)
3525{
3526 int prio1 = rs_bfer_priority(sta1);
3527 int prio2 = rs_bfer_priority(sta2);
3528
3529 if (prio1 > prio2)
3530 return 1;
3531 if (prio1 < prio2)
3532 return -1;
3533 return 0;
3534}
3535
3536static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3537 struct ieee80211_sta *sta,
3538 struct iwl_lq_sta *lq_sta,
3539 const struct rs_rate *initial_rate)
3540{
3541 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3542 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3543 struct rs_bfer_active_iter_data data = {
3544 .exclude_sta = sta,
3545 .bfer_mvmsta = NULL,
3546 };
3547 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3548 u32 ss_params = LQ_SS_PARAMS_VALID;
3549
3550 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3551 goto out;
3552
3553#ifdef CONFIG_MAC80211_DEBUGFS
3554 /* Check if forcing the decision is configured.
3555 * Note that SISO is forced by not allowing STBC or BFER
3556 */
3557 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3558 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3559 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3560 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3561
3562 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3563 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3564 lq_sta->pers.ss_force);
3565 goto out;
3566 }
3567#endif
3568
3569 if (lq_sta->stbc_capable)
3570 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3571
3572 if (!lq_sta->bfer_capable)
3573 goto out;
3574
3575 ieee80211_iterate_stations_atomic(mvm->hw,
3576 rs_bfer_active_iter,
3577 &data);
3578 bfer_mvmsta = data.bfer_mvmsta;
3579
3580 /* This code is safe as it doesn't run concurrently for different
3581 * stations. This is guaranteed by the fact that calls to
3582 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3583 */
3584 if (!bfer_mvmsta) {
3585 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3586
3587 ss_params |= LQ_SS_BFER_ALLOWED;
3588 goto out;
3589 }
3590
3591 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3592 bfer_mvmsta->sta_id);
3593
3594 /* Disallow BFER on another STA if active and we're a higher priority */
3595 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3596 struct iwl_lq_cmd *bfersta_lq_cmd =
3597 &bfer_mvmsta->lq_sta.rs_drv.lq;
3598 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3599
3600 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3601 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3602 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3603
3604 ss_params |= LQ_SS_BFER_ALLOWED;
3605 IWL_DEBUG_RATE(mvm,
3606 "Lower priority BFER sta found (%d). Switch BFER\n",
3607 bfer_mvmsta->sta_id);
3608 }
3609out:
3610 lq_cmd->ss_params = cpu_to_le32(ss_params);
3611}
3612
3613static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3614 struct ieee80211_sta *sta,
3615 struct iwl_lq_sta *lq_sta,
3616 const struct rs_rate *initial_rate)
3617{
3618 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3619 struct iwl_mvm_sta *mvmsta;
3620 struct iwl_mvm_vif *mvmvif;
3621
3622 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3623 lq_cmd->agg_time_limit =
3624 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3625
3626#ifdef CONFIG_MAC80211_DEBUGFS
3627 if (lq_sta->pers.dbg_fixed_rate) {
3628 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3629 lq_sta->band,
3630 lq_sta->pers.dbg_fixed_rate);
3631 return;
3632 }
3633#endif
3634 if (WARN_ON_ONCE(!sta || !initial_rate))
3635 return;
3636
3637 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3638
3639 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3640 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3641
3642 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3643 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3644
3645 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3646 num_of_ant(initial_rate->ant) == 1)
3647 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3648
3649 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3650
3651 /*
3652 * In case of low latency, tell the firmware to leave a frame in the
3653 * Tx Fifo so that it can start a transaction in the same TxOP. This
3654 * basically allows the firmware to send bursts.
3655 */
3656 if (iwl_mvm_vif_low_latency(mvmvif))
3657 lq_cmd->agg_frame_cnt_limit--;
3658
3659 if (mvmsta->vif->p2p)
3660 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3661
3662 lq_cmd->agg_time_limit =
3663 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3664}
3665
3666static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3667{
3668 return hw->priv;
3669}
3670
3671/* rate scale requires free function to be implemented */
3672static void rs_free(void *mvm_rate)
3673{
3674 return;
3675}
3676
3677static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3678{
3679 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3680 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3681
3682 IWL_DEBUG_RATE(mvm, "enter\n");
3683 IWL_DEBUG_RATE(mvm, "leave\n");
3684}
3685
3686#ifdef CONFIG_MAC80211_DEBUGFS
3687int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3688{
3689
3690 char *type, *bw;
3691 u8 mcs = 0, nss = 0;
3692 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3693
3694 if (!(rate & RATE_MCS_HT_MSK) &&
3695 !(rate & RATE_MCS_VHT_MSK) &&
3696 !(rate & RATE_MCS_HE_MSK)) {
3697 int index = iwl_hwrate_to_plcp_idx(rate);
3698
3699 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n",
3700 rs_pretty_ant(ant),
3701 index == IWL_RATE_INVALID ? "BAD" :
3702 iwl_rate_mcs[index].mbps);
3703 }
3704
3705 if (rate & RATE_MCS_VHT_MSK) {
3706 type = "VHT";
3707 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3708 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3709 >> RATE_VHT_MCS_NSS_POS) + 1;
3710 } else if (rate & RATE_MCS_HT_MSK) {
3711 type = "HT";
3712 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3713 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3714 >> RATE_HT_MCS_NSS_POS) + 1;
3715 } else if (rate & RATE_MCS_HE_MSK) {
3716 type = "HE";
3717 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3718 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3719 >> RATE_VHT_MCS_NSS_POS) + 1;
3720 } else {
3721 type = "Unknown"; /* shouldn't happen */
3722 }
3723
3724 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3725 case RATE_MCS_CHAN_WIDTH_20:
3726 bw = "20Mhz";
3727 break;
3728 case RATE_MCS_CHAN_WIDTH_40:
3729 bw = "40Mhz";
3730 break;
3731 case RATE_MCS_CHAN_WIDTH_80:
3732 bw = "80Mhz";
3733 break;
3734 case RATE_MCS_CHAN_WIDTH_160:
3735 bw = "160Mhz";
3736 break;
3737 default:
3738 bw = "BAD BW";
3739 }
3740
3741 return scnprintf(buf, bufsz,
3742 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3743 type, rs_pretty_ant(ant), bw, mcs, nss,
3744 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3745 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3746 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3747 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3748}
3749
3750/**
3751 * Program the device to use fixed rate for frame transmit
3752 * This is for debugging/testing only
3753 * once the device start use fixed rate, we need to reload the module
3754 * to being back the normal operation.
3755 */
3756static void rs_program_fix_rate(struct iwl_mvm *mvm,
3757 struct iwl_lq_sta *lq_sta)
3758{
3759 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3760 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3761 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3762
3763 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3764 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3765
3766 if (lq_sta->pers.dbg_fixed_rate) {
3767 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3768 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3769 }
3770}
3771
3772static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3773 const char __user *user_buf, size_t count, loff_t *ppos)
3774{
3775 struct iwl_lq_sta *lq_sta = file->private_data;
3776 struct iwl_mvm *mvm;
3777 char buf[64];
3778 size_t buf_size;
3779 u32 parsed_rate;
3780
3781 mvm = lq_sta->pers.drv;
3782 memset(buf, 0, sizeof(buf));
3783 buf_size = min(count, sizeof(buf) - 1);
3784 if (copy_from_user(buf, user_buf, buf_size))
3785 return -EFAULT;
3786
3787 if (sscanf(buf, "%x", &parsed_rate) == 1)
3788 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3789 else
3790 lq_sta->pers.dbg_fixed_rate = 0;
3791
3792 rs_program_fix_rate(mvm, lq_sta);
3793
3794 return count;
3795}
3796
3797static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3798 char __user *user_buf, size_t count, loff_t *ppos)
3799{
3800 char *buff;
3801 int desc = 0;
3802 int i = 0;
3803 ssize_t ret;
3804 static const size_t bufsz = 2048;
3805
3806 struct iwl_lq_sta *lq_sta = file->private_data;
3807 struct iwl_mvm_sta *mvmsta =
3808 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3809 struct iwl_mvm *mvm;
3810 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3811 struct rs_rate *rate = &tbl->rate;
3812 u32 ss_params;
3813
3814 mvm = lq_sta->pers.drv;
3815 buff = kmalloc(bufsz, GFP_KERNEL);
3816 if (!buff)
3817 return -ENOMEM;
3818
3819 desc += scnprintf(buff + desc, bufsz - desc,
3820 "sta_id %d\n", lq_sta->lq.sta_id);
3821 desc += scnprintf(buff + desc, bufsz - desc,
3822 "failed=%d success=%d rate=0%lX\n",
3823 lq_sta->total_failed, lq_sta->total_success,
3824 lq_sta->active_legacy_rate);
3825 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3826 lq_sta->pers.dbg_fixed_rate);
3827 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3828 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3829 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3830 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3831 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3832 (is_legacy(rate)) ? "legacy" :
3833 is_vht(rate) ? "VHT" : "HT");
3834 if (!is_legacy(rate)) {
3835 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3836 (is_siso(rate)) ? "SISO" : "MIMO2");
3837 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3838 (is_ht20(rate)) ? "20MHz" :
3839 (is_ht40(rate)) ? "40MHz" :
3840 (is_ht80(rate)) ? "80MHz" :
3841 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3842 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3843 (rate->sgi) ? "SGI" : "NGI",
3844 (rate->ldpc) ? "LDPC" : "BCC",
3845 (lq_sta->is_agg) ? "AGG on" : "",
3846 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3847 }
3848 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3849 lq_sta->last_rate_n_flags);
3850 desc += scnprintf(buff + desc, bufsz - desc,
3851 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3852 lq_sta->lq.flags,
3853 lq_sta->lq.mimo_delim,
3854 lq_sta->lq.single_stream_ant_msk,
3855 lq_sta->lq.dual_stream_ant_msk);
3856
3857 desc += scnprintf(buff + desc, bufsz - desc,
3858 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3859 le16_to_cpu(lq_sta->lq.agg_time_limit),
3860 lq_sta->lq.agg_disable_start_th,
3861 lq_sta->lq.agg_frame_cnt_limit);
3862
3863 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3864 lq_sta->lq.reduced_tpc);
3865 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3866 desc += scnprintf(buff + desc, bufsz - desc,
3867 "single stream params: %s%s%s%s\n",
3868 (ss_params & LQ_SS_PARAMS_VALID) ?
3869 "VALID" : "INVALID",
3870 (ss_params & LQ_SS_BFER_ALLOWED) ?
3871 ", BFER" : "",
3872 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3873 ", STBC" : "",
3874 (ss_params & LQ_SS_FORCE) ?
3875 ", FORCE" : "");
3876 desc += scnprintf(buff + desc, bufsz - desc,
3877 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3878 lq_sta->lq.initial_rate_index[0],
3879 lq_sta->lq.initial_rate_index[1],
3880 lq_sta->lq.initial_rate_index[2],
3881 lq_sta->lq.initial_rate_index[3]);
3882
3883 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3884 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3885
3886 desc += scnprintf(buff + desc, bufsz - desc,
3887 " rate[%d] 0x%X ", i, r);
3888 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3889 }
3890
3891 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3892 kfree(buff);
3893 return ret;
3894}
3895
3896static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3897 .write = rs_sta_dbgfs_scale_table_write,
3898 .read = rs_sta_dbgfs_scale_table_read,
3899 .open = simple_open,
3900 .llseek = default_llseek,
3901};
3902static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3903 char __user *user_buf, size_t count, loff_t *ppos)
3904{
3905 char *buff;
3906 int desc = 0;
3907 int i, j;
3908 ssize_t ret;
3909 struct iwl_scale_tbl_info *tbl;
3910 struct rs_rate *rate;
3911 struct iwl_lq_sta *lq_sta = file->private_data;
3912
3913 buff = kmalloc(1024, GFP_KERNEL);
3914 if (!buff)
3915 return -ENOMEM;
3916
3917 for (i = 0; i < LQ_SIZE; i++) {
3918 tbl = &(lq_sta->lq_info[i]);
3919 rate = &tbl->rate;
3920 desc += sprintf(buff+desc,
3921 "%s type=%d SGI=%d BW=%s DUP=0\n"
3922 "index=%d\n",
3923 lq_sta->active_tbl == i ? "*" : "x",
3924 rate->type,
3925 rate->sgi,
3926 is_ht20(rate) ? "20MHz" :
3927 is_ht40(rate) ? "40MHz" :
3928 is_ht80(rate) ? "80MHz" :
3929 is_ht160(rate) ? "160MHz" : "ERR",
3930 rate->index);
3931 for (j = 0; j < IWL_RATE_COUNT; j++) {
3932 desc += sprintf(buff+desc,
3933 "counter=%d success=%d %%=%d\n",
3934 tbl->win[j].counter,
3935 tbl->win[j].success_counter,
3936 tbl->win[j].success_ratio);
3937 }
3938 }
3939 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3940 kfree(buff);
3941 return ret;
3942}
3943
3944static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3945 .read = rs_sta_dbgfs_stats_table_read,
3946 .open = simple_open,
3947 .llseek = default_llseek,
3948};
3949
3950static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3951 char __user *user_buf,
3952 size_t count, loff_t *ppos)
3953{
3954 static const char * const column_name[] = {
3955 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3956 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3957 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3958 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3959 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3960 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3961 [RS_COLUMN_MIMO2] = "MIMO2",
3962 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3963 };
3964
3965 static const char * const rate_name[] = {
3966 [IWL_RATE_1M_INDEX] = "1M",
3967 [IWL_RATE_2M_INDEX] = "2M",
3968 [IWL_RATE_5M_INDEX] = "5.5M",
3969 [IWL_RATE_11M_INDEX] = "11M",
3970 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3971 [IWL_RATE_9M_INDEX] = "9M",
3972 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3973 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3974 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3975 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3976 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3977 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3978 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3979 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3980 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3981 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3982 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3983 };
3984
3985 char *buff, *pos, *endpos;
3986 int col, rate;
3987 ssize_t ret;
3988 struct iwl_lq_sta *lq_sta = file->private_data;
3989 struct rs_rate_stats *stats;
3990 static const size_t bufsz = 1024;
3991
3992 buff = kmalloc(bufsz, GFP_KERNEL);
3993 if (!buff)
3994 return -ENOMEM;
3995
3996 pos = buff;
3997 endpos = pos + bufsz;
3998
3999 pos += scnprintf(pos, endpos - pos, "COLUMN,");
4000 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
4001 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
4002 pos += scnprintf(pos, endpos - pos, "\n");
4003
4004 for (col = 0; col < RS_COLUMN_COUNT; col++) {
4005 pos += scnprintf(pos, endpos - pos,
4006 "%s,", column_name[col]);
4007
4008 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
4009 stats = &(lq_sta->pers.tx_stats[col][rate]);
4010 pos += scnprintf(pos, endpos - pos,
4011 "%llu/%llu,",
4012 stats->success,
4013 stats->total);
4014 }
4015 pos += scnprintf(pos, endpos - pos, "\n");
4016 }
4017
4018 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
4019 kfree(buff);
4020 return ret;
4021}
4022
4023static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
4024 const char __user *user_buf,
4025 size_t count, loff_t *ppos)
4026{
4027 struct iwl_lq_sta *lq_sta = file->private_data;
4028 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
4029
4030 return count;
4031}
4032
4033static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
4034 .read = rs_sta_dbgfs_drv_tx_stats_read,
4035 .write = rs_sta_dbgfs_drv_tx_stats_write,
4036 .open = simple_open,
4037 .llseek = default_llseek,
4038};
4039
4040static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
4041 char __user *user_buf,
4042 size_t count, loff_t *ppos)
4043{
4044 struct iwl_lq_sta *lq_sta = file->private_data;
4045 char buf[12];
4046 int bufsz = sizeof(buf);
4047 int pos = 0;
4048 static const char * const ss_force_name[] = {
4049 [RS_SS_FORCE_NONE] = "none",
4050 [RS_SS_FORCE_STBC] = "stbc",
4051 [RS_SS_FORCE_BFER] = "bfer",
4052 [RS_SS_FORCE_SISO] = "siso",
4053 };
4054
4055 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4056 ss_force_name[lq_sta->pers.ss_force]);
4057 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4058}
4059
4060static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4061 size_t count, loff_t *ppos)
4062{
4063 struct iwl_mvm *mvm = lq_sta->pers.drv;
4064 int ret = 0;
4065
4066 if (!strncmp("none", buf, 4)) {
4067 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4068 } else if (!strncmp("siso", buf, 4)) {
4069 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4070 } else if (!strncmp("stbc", buf, 4)) {
4071 if (lq_sta->stbc_capable) {
4072 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4073 } else {
4074 IWL_ERR(mvm,
4075 "can't force STBC. peer doesn't support\n");
4076 ret = -EINVAL;
4077 }
4078 } else if (!strncmp("bfer", buf, 4)) {
4079 if (lq_sta->bfer_capable) {
4080 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4081 } else {
4082 IWL_ERR(mvm,
4083 "can't force BFER. peer doesn't support\n");
4084 ret = -EINVAL;
4085 }
4086 } else {
4087 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4088 ret = -EINVAL;
4089 }
4090 return ret ?: count;
4091}
4092
4093#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4094 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4095#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
4096 debugfs_create_file(#name, mode, parent, lq_sta, \
4097 &iwl_dbgfs_##name##_ops); \
4098 } while (0)
4099
4100MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4101
4102static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4103 struct dentry *dir)
4104{
4105 struct iwl_lq_sta *lq_sta = priv_sta;
4106 struct iwl_mvm_sta *mvmsta;
4107
4108 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4109
4110 if (!mvmsta->vif)
4111 return;
4112
4113 debugfs_create_file("rate_scale_table", 0600, dir,
4114 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4115 debugfs_create_file("rate_stats_table", 0400, dir,
4116 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4117 debugfs_create_file("drv_tx_stats", 0600, dir,
4118 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4119 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4120 &lq_sta->tx_agg_tid_en);
4121 debugfs_create_u8("reduced_tpc", 0600, dir,
4122 &lq_sta->pers.dbg_fixed_txp_reduction);
4123
4124 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4125}
4126#endif
4127
4128/*
4129 * Initialization of rate scaling information is done by driver after
4130 * the station is added. Since mac80211 calls this function before a
4131 * station is added we ignore it.
4132 */
4133static void rs_rate_init_ops(void *mvm_r,
4134 struct ieee80211_supported_band *sband,
4135 struct cfg80211_chan_def *chandef,
4136 struct ieee80211_sta *sta, void *mvm_sta)
4137{
4138}
4139
4140/* ops for rate scaling implemented in the driver */
4141static const struct rate_control_ops rs_mvm_ops_drv = {
4142 .name = RS_NAME,
4143 .tx_status = rs_drv_mac80211_tx_status,
4144 .get_rate = rs_drv_get_rate,
4145 .rate_init = rs_rate_init_ops,
4146 .alloc = rs_alloc,
4147 .free = rs_free,
4148 .alloc_sta = rs_drv_alloc_sta,
4149 .free_sta = rs_free_sta,
4150 .rate_update = rs_drv_rate_update,
4151#ifdef CONFIG_MAC80211_DEBUGFS
4152 .add_sta_debugfs = rs_drv_add_sta_debugfs,
4153#endif
4154 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4155};
4156
4157void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4158 enum nl80211_band band, bool update)
4159{
4160 if (iwl_mvm_has_tlc_offload(mvm)) {
4161 rs_fw_rate_init(mvm, sta, band, update);
4162 } else {
4163 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4164
4165 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock);
4166 rs_drv_rate_init(mvm, sta, band);
4167 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
4168 }
4169}
4170
4171int iwl_mvm_rate_control_register(void)
4172{
4173 return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4174}
4175
4176void iwl_mvm_rate_control_unregister(void)
4177{
4178 ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4179}
4180
4181static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4182 bool enable)
4183{
4184 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4185
4186 lockdep_assert_held(&mvm->mutex);
4187
4188 if (enable) {
4189 if (mvmsta->tx_protection == 0)
4190 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4191 mvmsta->tx_protection++;
4192 } else {
4193 mvmsta->tx_protection--;
4194 if (mvmsta->tx_protection == 0)
4195 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4196 }
4197
4198 return iwl_mvm_send_lq_cmd(mvm, lq);
4199}
4200
4201/**
4202 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4203 * @mvmsta: The station
4204 * @enable: Enable Tx protection?
4205 */
4206int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4207 bool enable)
4208{
4209 if (iwl_mvm_has_tlc_offload(mvm))
4210 return rs_fw_tx_protection(mvm, mvmsta, enable);
4211 else
4212 return rs_drv_tx_protection(mvm, mvmsta, enable);
4213}