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Merge tag 'timers-urgent-2020-04-25' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-hirsute-kernel.git] / drivers / net / wireless / intel / iwlwifi / mvm / rs.c
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
38 static 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
51 static 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 */
84 static 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
102 enum rs_action {
103 RS_ACTION_STAY = 0,
104 RS_ACTION_DOWNSCALE = -1,
105 RS_ACTION_UPSCALE = 1,
106 };
107
108 enum 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
118 struct rs_tx_column;
119
120 typedef 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
125 struct 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
133 static 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
140 static 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
162 static 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
172 static 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
195 static 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
336 static 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
342 static 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
380 static 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);
384 static 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);
388 static 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
401 static 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 */
408 static 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
415 static 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
422 static 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
429 static 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
436 static 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
443 static 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
450 static 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
457 static 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 */
465 static 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
483 static 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
502 static 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
522 static 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
567 static 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
576 static 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
585 static 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
598 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
599 {
600 return (ant_type & valid_antenna) == ant_type;
601 }
602
603 static 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
627 static 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
656 static 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 */
667 static 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 */
681 static 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
746 static 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
762 static 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
792 static 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 */
818 static 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 */
880 static 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 */
976 static 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
1000 static 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
1014 static 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
1070 static 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 */
1079 static 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 */
1101 static 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 */
1140 static 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
1154 static 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
1181 err:
1182 return RS_COLUMN_INVALID;
1183 }
1184
1185 static 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 */
1203 static 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 */
1233 static 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
1254 static 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
1261 static 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
1278 static 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
1346 static 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 */
1362 static inline u8 rs_search_tbl(u8 active_tbl)
1363 {
1364 return (active_tbl ^ 1) & 1;
1365 }
1366
1367 static 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
1413 static 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 */
1453 static 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
1529 static 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 sta->max_amsdu_len = rs_fw_get_max_amsdu_len(sta);
1537
1538 /*
1539 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1540 * or 0, since there is no per-TID alg.
1541 */
1542 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1543 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1544 scale_action == RS_ACTION_DOWNSCALE)
1545 mvmsta->amsdu_enabled = 0;
1546 else
1547 mvmsta->amsdu_enabled = 0xFFFF;
1548
1549 if (mvmsta->vif->bss_conf.he_support &&
1550 !iwlwifi_mod_params.disable_11ax)
1551 mvmsta->max_amsdu_len = sta->max_amsdu_len;
1552 else
1553 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1554
1555 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1556
1557 for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1558 if (mvmsta->amsdu_enabled)
1559 sta->max_tid_amsdu_len[i] =
1560 iwl_mvm_max_amsdu_size(mvm, sta, i);
1561 else
1562 /*
1563 * Not so elegant, but this will effectively
1564 * prevent AMSDU on this TID
1565 */
1566 sta->max_tid_amsdu_len[i] = 1;
1567 }
1568 }
1569
1570 /*
1571 * setup rate table in uCode
1572 */
1573 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1574 struct ieee80211_sta *sta,
1575 struct iwl_lq_sta *lq_sta,
1576 struct iwl_scale_tbl_info *tbl)
1577 {
1578 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1579 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1580 }
1581
1582 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1583 struct ieee80211_sta *sta,
1584 struct iwl_lq_sta *lq_sta,
1585 struct iwl_scale_tbl_info *tbl,
1586 enum rs_action scale_action)
1587 {
1588 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1589 return false;
1590
1591 if (!is_vht_siso(&tbl->rate))
1592 return false;
1593
1594 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1595 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1596 (scale_action == RS_ACTION_DOWNSCALE)) {
1597 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1598 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1599 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1600 goto tweaked;
1601 }
1602
1603 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1604 * sustainable, i.e. we're past the test window. We can't go back
1605 * if MCS5 is just tested as this will happen always after switching
1606 * to 20Mhz MCS4 because the rate stats are cleared.
1607 */
1608 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1609 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1610 (scale_action == RS_ACTION_STAY)) ||
1611 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1612 (scale_action == RS_ACTION_UPSCALE)))) {
1613 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1614 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1615 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1616 goto tweaked;
1617 }
1618
1619 return false;
1620
1621 tweaked:
1622 rs_set_expected_tpt_table(lq_sta, tbl);
1623 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1624 return true;
1625 }
1626
1627 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1628 struct iwl_lq_sta *lq_sta,
1629 struct ieee80211_sta *sta,
1630 struct iwl_scale_tbl_info *tbl)
1631 {
1632 int i, j, max_rate;
1633 enum rs_column next_col_id;
1634 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1635 const struct rs_tx_column *next_col;
1636 allow_column_func_t allow_func;
1637 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1638 const u16 *expected_tpt_tbl;
1639 u16 tpt, max_expected_tpt;
1640
1641 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1642 next_col_id = curr_col->next_columns[i];
1643
1644 if (next_col_id == RS_COLUMN_INVALID)
1645 continue;
1646
1647 if (lq_sta->visited_columns & BIT(next_col_id)) {
1648 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1649 next_col_id);
1650 continue;
1651 }
1652
1653 next_col = &rs_tx_columns[next_col_id];
1654
1655 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1656 IWL_DEBUG_RATE(mvm,
1657 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1658 next_col_id, valid_ants, next_col->ant);
1659 continue;
1660 }
1661
1662 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1663 allow_func = next_col->checks[j];
1664 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1665 next_col))
1666 break;
1667 }
1668
1669 if (j != MAX_COLUMN_CHECKS) {
1670 IWL_DEBUG_RATE(mvm,
1671 "Skip column %d: not allowed (check %d failed)\n",
1672 next_col_id, j);
1673
1674 continue;
1675 }
1676
1677 tpt = lq_sta->last_tpt / 100;
1678 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1679 rs_bw_from_sta_bw(sta));
1680 if (WARN_ON_ONCE(!expected_tpt_tbl))
1681 continue;
1682
1683 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1684 if (max_rate == IWL_RATE_INVALID) {
1685 IWL_DEBUG_RATE(mvm,
1686 "Skip column %d: no rate is allowed in this column\n",
1687 next_col_id);
1688 continue;
1689 }
1690
1691 max_expected_tpt = expected_tpt_tbl[max_rate];
1692 if (tpt >= max_expected_tpt) {
1693 IWL_DEBUG_RATE(mvm,
1694 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1695 next_col_id, max_expected_tpt, tpt);
1696 continue;
1697 }
1698
1699 IWL_DEBUG_RATE(mvm,
1700 "Found potential column %d. Max expected %d current %d\n",
1701 next_col_id, max_expected_tpt, tpt);
1702 break;
1703 }
1704
1705 if (i == MAX_NEXT_COLUMNS)
1706 return RS_COLUMN_INVALID;
1707
1708 return next_col_id;
1709 }
1710
1711 static int rs_switch_to_column(struct iwl_mvm *mvm,
1712 struct iwl_lq_sta *lq_sta,
1713 struct ieee80211_sta *sta,
1714 enum rs_column col_id)
1715 {
1716 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1717 struct iwl_scale_tbl_info *search_tbl =
1718 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1719 struct rs_rate *rate = &search_tbl->rate;
1720 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1721 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1722 unsigned long rate_mask = 0;
1723 u32 rate_idx = 0;
1724
1725 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1726
1727 rate->sgi = column->sgi;
1728 rate->ant = column->ant;
1729
1730 if (column->mode == RS_LEGACY) {
1731 if (lq_sta->band == NL80211_BAND_5GHZ)
1732 rate->type = LQ_LEGACY_A;
1733 else
1734 rate->type = LQ_LEGACY_G;
1735
1736 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1737 rate->ldpc = false;
1738 rate_mask = lq_sta->active_legacy_rate;
1739 } else if (column->mode == RS_SISO) {
1740 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1741 rate_mask = lq_sta->active_siso_rate;
1742 } else if (column->mode == RS_MIMO2) {
1743 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1744 rate_mask = lq_sta->active_mimo2_rate;
1745 } else {
1746 WARN_ONCE(1, "Bad column mode");
1747 }
1748
1749 if (column->mode != RS_LEGACY) {
1750 rate->bw = rs_bw_from_sta_bw(sta);
1751 rate->ldpc = lq_sta->ldpc;
1752 }
1753
1754 search_tbl->column = col_id;
1755 rs_set_expected_tpt_table(lq_sta, search_tbl);
1756
1757 lq_sta->visited_columns |= BIT(col_id);
1758
1759 /* Get the best matching rate if we're changing modes. e.g.
1760 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1761 */
1762 if (curr_column->mode != column->mode) {
1763 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1764 rate_mask, rate->index);
1765
1766 if ((rate_idx == IWL_RATE_INVALID) ||
1767 !(BIT(rate_idx) & rate_mask)) {
1768 IWL_DEBUG_RATE(mvm,
1769 "can not switch with index %d"
1770 " rate mask %lx\n",
1771 rate_idx, rate_mask);
1772
1773 goto err;
1774 }
1775
1776 rate->index = rate_idx;
1777 }
1778
1779 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1780 col_id, rate->index);
1781
1782 return 0;
1783
1784 err:
1785 rate->type = LQ_NONE;
1786 return -1;
1787 }
1788
1789 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1790 struct iwl_scale_tbl_info *tbl,
1791 s32 sr, int low, int high,
1792 int current_tpt,
1793 int low_tpt, int high_tpt)
1794 {
1795 enum rs_action action = RS_ACTION_STAY;
1796
1797 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1798 (current_tpt == 0)) {
1799 IWL_DEBUG_RATE(mvm,
1800 "Decrease rate because of low SR\n");
1801 return RS_ACTION_DOWNSCALE;
1802 }
1803
1804 if ((low_tpt == IWL_INVALID_VALUE) &&
1805 (high_tpt == IWL_INVALID_VALUE) &&
1806 (high != IWL_RATE_INVALID)) {
1807 IWL_DEBUG_RATE(mvm,
1808 "No data about high/low rates. Increase rate\n");
1809 return RS_ACTION_UPSCALE;
1810 }
1811
1812 if ((high_tpt == IWL_INVALID_VALUE) &&
1813 (high != IWL_RATE_INVALID) &&
1814 (low_tpt != IWL_INVALID_VALUE) &&
1815 (low_tpt < current_tpt)) {
1816 IWL_DEBUG_RATE(mvm,
1817 "No data about high rate and low rate is worse. Increase rate\n");
1818 return RS_ACTION_UPSCALE;
1819 }
1820
1821 if ((high_tpt != IWL_INVALID_VALUE) &&
1822 (high_tpt > current_tpt)) {
1823 IWL_DEBUG_RATE(mvm,
1824 "Higher rate is better. Increate rate\n");
1825 return RS_ACTION_UPSCALE;
1826 }
1827
1828 if ((low_tpt != IWL_INVALID_VALUE) &&
1829 (high_tpt != IWL_INVALID_VALUE) &&
1830 (low_tpt < current_tpt) &&
1831 (high_tpt < current_tpt)) {
1832 IWL_DEBUG_RATE(mvm,
1833 "Both high and low are worse. Maintain rate\n");
1834 return RS_ACTION_STAY;
1835 }
1836
1837 if ((low_tpt != IWL_INVALID_VALUE) &&
1838 (low_tpt > current_tpt)) {
1839 IWL_DEBUG_RATE(mvm,
1840 "Lower rate is better\n");
1841 action = RS_ACTION_DOWNSCALE;
1842 goto out;
1843 }
1844
1845 if ((low_tpt == IWL_INVALID_VALUE) &&
1846 (low != IWL_RATE_INVALID)) {
1847 IWL_DEBUG_RATE(mvm,
1848 "No data about lower rate\n");
1849 action = RS_ACTION_DOWNSCALE;
1850 goto out;
1851 }
1852
1853 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1854
1855 out:
1856 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1857 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1858 IWL_DEBUG_RATE(mvm,
1859 "SR is above NO DECREASE. Avoid downscale\n");
1860 action = RS_ACTION_STAY;
1861 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1862 IWL_DEBUG_RATE(mvm,
1863 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1864 action = RS_ACTION_STAY;
1865 } else {
1866 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1867 }
1868 }
1869
1870 return action;
1871 }
1872
1873 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1874 struct iwl_lq_sta *lq_sta)
1875 {
1876 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1877 * supports STBC of at least 1*SS
1878 */
1879 if (!lq_sta->stbc_capable)
1880 return false;
1881
1882 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1883 return false;
1884
1885 return true;
1886 }
1887
1888 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1889 int *weaker, int *stronger)
1890 {
1891 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1892 if (*weaker > TPC_MAX_REDUCTION)
1893 *weaker = TPC_INVALID;
1894
1895 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1896 if (*stronger < 0)
1897 *stronger = TPC_INVALID;
1898 }
1899
1900 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1901 struct rs_rate *rate, enum nl80211_band band)
1902 {
1903 int index = rate->index;
1904 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1905 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1906 !vif->bss_conf.ps);
1907
1908 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1909 cam, sta_ps_disabled);
1910 /*
1911 * allow tpc only if power management is enabled, or bt coex
1912 * activity grade allows it and we are on 2.4Ghz.
1913 */
1914 if ((cam || sta_ps_disabled) &&
1915 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1916 return false;
1917
1918 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1919 if (is_legacy(rate))
1920 return index == IWL_RATE_54M_INDEX;
1921 if (is_ht(rate))
1922 return index == IWL_RATE_MCS_7_INDEX;
1923 if (is_vht(rate))
1924 return index == IWL_RATE_MCS_7_INDEX ||
1925 index == IWL_RATE_MCS_8_INDEX ||
1926 index == IWL_RATE_MCS_9_INDEX;
1927
1928 WARN_ON_ONCE(1);
1929 return false;
1930 }
1931
1932 enum tpc_action {
1933 TPC_ACTION_STAY,
1934 TPC_ACTION_DECREASE,
1935 TPC_ACTION_INCREASE,
1936 TPC_ACTION_NO_RESTIRCTION,
1937 };
1938
1939 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1940 s32 sr, int weak, int strong,
1941 int current_tpt,
1942 int weak_tpt, int strong_tpt)
1943 {
1944 /* stay until we have valid tpt */
1945 if (current_tpt == IWL_INVALID_VALUE) {
1946 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1947 return TPC_ACTION_STAY;
1948 }
1949
1950 /* Too many failures, increase txp */
1951 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1952 current_tpt == 0) {
1953 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1954 return TPC_ACTION_NO_RESTIRCTION;
1955 }
1956
1957 /* try decreasing first if applicable */
1958 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1959 weak != TPC_INVALID) {
1960 if (weak_tpt == IWL_INVALID_VALUE &&
1961 (strong_tpt == IWL_INVALID_VALUE ||
1962 current_tpt >= strong_tpt)) {
1963 IWL_DEBUG_RATE(mvm,
1964 "no weak txp measurement. decrease txp\n");
1965 return TPC_ACTION_DECREASE;
1966 }
1967
1968 if (weak_tpt > current_tpt) {
1969 IWL_DEBUG_RATE(mvm,
1970 "lower txp has better tpt. decrease txp\n");
1971 return TPC_ACTION_DECREASE;
1972 }
1973 }
1974
1975 /* next, increase if needed */
1976 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1977 strong != TPC_INVALID) {
1978 if (weak_tpt == IWL_INVALID_VALUE &&
1979 strong_tpt != IWL_INVALID_VALUE &&
1980 current_tpt < strong_tpt) {
1981 IWL_DEBUG_RATE(mvm,
1982 "higher txp has better tpt. increase txp\n");
1983 return TPC_ACTION_INCREASE;
1984 }
1985
1986 if (weak_tpt < current_tpt &&
1987 (strong_tpt == IWL_INVALID_VALUE ||
1988 strong_tpt > current_tpt)) {
1989 IWL_DEBUG_RATE(mvm,
1990 "lower txp has worse tpt. increase txp\n");
1991 return TPC_ACTION_INCREASE;
1992 }
1993 }
1994
1995 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1996 return TPC_ACTION_STAY;
1997 }
1998
1999 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2000 struct ieee80211_sta *sta,
2001 struct iwl_lq_sta *lq_sta,
2002 struct iwl_scale_tbl_info *tbl)
2003 {
2004 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2005 struct ieee80211_vif *vif = mvm_sta->vif;
2006 struct ieee80211_chanctx_conf *chanctx_conf;
2007 enum nl80211_band band;
2008 struct iwl_rate_scale_data *window;
2009 struct rs_rate *rate = &tbl->rate;
2010 enum tpc_action action;
2011 s32 sr;
2012 u8 cur = lq_sta->lq.reduced_tpc;
2013 int current_tpt;
2014 int weak, strong;
2015 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2016
2017 #ifdef CONFIG_MAC80211_DEBUGFS
2018 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2019 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2020 lq_sta->pers.dbg_fixed_txp_reduction);
2021 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2022 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2023 }
2024 #endif
2025
2026 rcu_read_lock();
2027 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2028 if (WARN_ON(!chanctx_conf))
2029 band = NUM_NL80211_BANDS;
2030 else
2031 band = chanctx_conf->def.chan->band;
2032 rcu_read_unlock();
2033
2034 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2035 IWL_DEBUG_RATE(mvm,
2036 "tpc is not allowed. remove txp restrictions\n");
2037 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2038 return cur != TPC_NO_REDUCTION;
2039 }
2040
2041 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2042
2043 /* Collect measured throughputs for current and adjacent rates */
2044 window = tbl->tpc_win;
2045 sr = window[cur].success_ratio;
2046 current_tpt = window[cur].average_tpt;
2047 if (weak != TPC_INVALID)
2048 weak_tpt = window[weak].average_tpt;
2049 if (strong != TPC_INVALID)
2050 strong_tpt = window[strong].average_tpt;
2051
2052 IWL_DEBUG_RATE(mvm,
2053 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2054 cur, current_tpt, sr, weak, strong,
2055 weak_tpt, strong_tpt);
2056
2057 action = rs_get_tpc_action(mvm, sr, weak, strong,
2058 current_tpt, weak_tpt, strong_tpt);
2059
2060 /* override actions if we are on the edge */
2061 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2062 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2063 action = TPC_ACTION_STAY;
2064 } else if (strong == TPC_INVALID &&
2065 (action == TPC_ACTION_INCREASE ||
2066 action == TPC_ACTION_NO_RESTIRCTION)) {
2067 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2068 action = TPC_ACTION_STAY;
2069 }
2070
2071 switch (action) {
2072 case TPC_ACTION_DECREASE:
2073 lq_sta->lq.reduced_tpc = weak;
2074 return true;
2075 case TPC_ACTION_INCREASE:
2076 lq_sta->lq.reduced_tpc = strong;
2077 return true;
2078 case TPC_ACTION_NO_RESTIRCTION:
2079 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2080 return true;
2081 case TPC_ACTION_STAY:
2082 /* do nothing */
2083 break;
2084 }
2085 return false;
2086 }
2087
2088 /*
2089 * Do rate scaling and search for new modulation mode.
2090 */
2091 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2092 struct ieee80211_sta *sta,
2093 struct iwl_lq_sta *lq_sta,
2094 int tid, bool ndp)
2095 {
2096 int low = IWL_RATE_INVALID;
2097 int high = IWL_RATE_INVALID;
2098 int index;
2099 struct iwl_rate_scale_data *window = NULL;
2100 int current_tpt = IWL_INVALID_VALUE;
2101 int low_tpt = IWL_INVALID_VALUE;
2102 int high_tpt = IWL_INVALID_VALUE;
2103 u32 fail_count;
2104 enum rs_action scale_action = RS_ACTION_STAY;
2105 u16 rate_mask;
2106 u8 update_lq = 0;
2107 struct iwl_scale_tbl_info *tbl, *tbl1;
2108 u8 active_tbl = 0;
2109 u8 done_search = 0;
2110 u16 high_low;
2111 s32 sr;
2112 u8 prev_agg = lq_sta->is_agg;
2113 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2114 struct rs_rate *rate;
2115
2116 lq_sta->is_agg = !!mvmsta->agg_tids;
2117
2118 /*
2119 * Select rate-scale / modulation-mode table to work with in
2120 * the rest of this function: "search" if searching for better
2121 * modulation mode, or "active" if doing rate scaling within a mode.
2122 */
2123 if (!lq_sta->search_better_tbl)
2124 active_tbl = lq_sta->active_tbl;
2125 else
2126 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2127
2128 tbl = &(lq_sta->lq_info[active_tbl]);
2129 rate = &tbl->rate;
2130
2131 if (prev_agg != lq_sta->is_agg) {
2132 IWL_DEBUG_RATE(mvm,
2133 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2134 prev_agg, lq_sta->is_agg);
2135 rs_set_expected_tpt_table(lq_sta, tbl);
2136 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2137 }
2138
2139 /* current tx rate */
2140 index = rate->index;
2141
2142 /* rates available for this association, and for modulation mode */
2143 rate_mask = rs_get_supported_rates(lq_sta, rate);
2144
2145 if (!(BIT(index) & rate_mask)) {
2146 IWL_ERR(mvm, "Current Rate is not valid\n");
2147 if (lq_sta->search_better_tbl) {
2148 /* revert to active table if search table is not valid*/
2149 rate->type = LQ_NONE;
2150 lq_sta->search_better_tbl = 0;
2151 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2152 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2153 }
2154 return;
2155 }
2156
2157 /* Get expected throughput table and history window for current rate */
2158 if (!tbl->expected_tpt) {
2159 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2160 return;
2161 }
2162
2163 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2164 window = &(tbl->win[index]);
2165
2166 /*
2167 * If there is not enough history to calculate actual average
2168 * throughput, keep analyzing results of more tx frames, without
2169 * changing rate or mode (bypass most of the rest of this function).
2170 * Set up new rate table in uCode only if old rate is not supported
2171 * in current association (use new rate found above).
2172 */
2173 fail_count = window->counter - window->success_counter;
2174 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2175 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2176 IWL_DEBUG_RATE(mvm,
2177 "%s: Test Window: succ %d total %d\n",
2178 rs_pretty_rate(rate),
2179 window->success_counter, window->counter);
2180
2181 /* Can't calculate this yet; not enough history */
2182 window->average_tpt = IWL_INVALID_VALUE;
2183
2184 /* Should we stay with this modulation mode,
2185 * or search for a new one? */
2186 rs_stay_in_table(lq_sta, false);
2187
2188 return;
2189 }
2190
2191 /* If we are searching for better modulation mode, check success. */
2192 if (lq_sta->search_better_tbl) {
2193 /* If good success, continue using the "search" mode;
2194 * no need to send new link quality command, since we're
2195 * continuing to use the setup that we've been trying. */
2196 if (window->average_tpt > lq_sta->last_tpt) {
2197 IWL_DEBUG_RATE(mvm,
2198 "SWITCHING TO NEW TABLE SR: %d "
2199 "cur-tpt %d old-tpt %d\n",
2200 window->success_ratio,
2201 window->average_tpt,
2202 lq_sta->last_tpt);
2203
2204 /* Swap tables; "search" becomes "active" */
2205 lq_sta->active_tbl = active_tbl;
2206 current_tpt = window->average_tpt;
2207 /* Else poor success; go back to mode in "active" table */
2208 } else {
2209 IWL_DEBUG_RATE(mvm,
2210 "GOING BACK TO THE OLD TABLE: SR %d "
2211 "cur-tpt %d old-tpt %d\n",
2212 window->success_ratio,
2213 window->average_tpt,
2214 lq_sta->last_tpt);
2215
2216 /* Nullify "search" table */
2217 rate->type = LQ_NONE;
2218
2219 /* Revert to "active" table */
2220 active_tbl = lq_sta->active_tbl;
2221 tbl = &(lq_sta->lq_info[active_tbl]);
2222
2223 /* Revert to "active" rate and throughput info */
2224 index = tbl->rate.index;
2225 current_tpt = lq_sta->last_tpt;
2226
2227 /* Need to set up a new rate table in uCode */
2228 update_lq = 1;
2229 }
2230
2231 /* Either way, we've made a decision; modulation mode
2232 * search is done, allow rate adjustment next time. */
2233 lq_sta->search_better_tbl = 0;
2234 done_search = 1; /* Don't switch modes below! */
2235 goto lq_update;
2236 }
2237
2238 /* (Else) not in search of better modulation mode, try for better
2239 * starting rate, while staying in this mode. */
2240 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2241 low = high_low & 0xff;
2242 high = (high_low >> 8) & 0xff;
2243
2244 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2245
2246 sr = window->success_ratio;
2247
2248 /* Collect measured throughputs for current and adjacent rates */
2249 current_tpt = window->average_tpt;
2250 if (low != IWL_RATE_INVALID)
2251 low_tpt = tbl->win[low].average_tpt;
2252 if (high != IWL_RATE_INVALID)
2253 high_tpt = tbl->win[high].average_tpt;
2254
2255 IWL_DEBUG_RATE(mvm,
2256 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2257 rs_pretty_rate(rate), current_tpt, sr,
2258 low, high, low_tpt, high_tpt);
2259
2260 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2261 current_tpt, low_tpt, high_tpt);
2262
2263 /* Force a search in case BT doesn't like us being in MIMO */
2264 if (is_mimo(rate) &&
2265 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2266 IWL_DEBUG_RATE(mvm,
2267 "BT Coex forbids MIMO. Search for new config\n");
2268 rs_stay_in_table(lq_sta, true);
2269 goto lq_update;
2270 }
2271
2272 switch (scale_action) {
2273 case RS_ACTION_DOWNSCALE:
2274 /* Decrease starting rate, update uCode's rate table */
2275 if (low != IWL_RATE_INVALID) {
2276 update_lq = 1;
2277 index = low;
2278 } else {
2279 IWL_DEBUG_RATE(mvm,
2280 "At the bottom rate. Can't decrease\n");
2281 }
2282
2283 break;
2284 case RS_ACTION_UPSCALE:
2285 /* Increase starting rate, update uCode's rate table */
2286 if (high != IWL_RATE_INVALID) {
2287 update_lq = 1;
2288 index = high;
2289 } else {
2290 IWL_DEBUG_RATE(mvm,
2291 "At the top rate. Can't increase\n");
2292 }
2293
2294 break;
2295 case RS_ACTION_STAY:
2296 /* No change */
2297 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2298 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2299 break;
2300 default:
2301 break;
2302 }
2303
2304 lq_update:
2305 /* Replace uCode's rate table for the destination station. */
2306 if (update_lq) {
2307 tbl->rate.index = index;
2308 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2309 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2310 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2311 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2312 }
2313
2314 rs_stay_in_table(lq_sta, false);
2315
2316 /*
2317 * Search for new modulation mode if we're:
2318 * 1) Not changing rates right now
2319 * 2) Not just finishing up a search
2320 * 3) Allowing a new search
2321 */
2322 if (!update_lq && !done_search &&
2323 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2324 && window->counter) {
2325 enum rs_column next_column;
2326
2327 /* Save current throughput to compare with "search" throughput*/
2328 lq_sta->last_tpt = current_tpt;
2329
2330 IWL_DEBUG_RATE(mvm,
2331 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2332 update_lq, done_search, lq_sta->rs_state,
2333 window->counter);
2334
2335 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2336 if (next_column != RS_COLUMN_INVALID) {
2337 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2338 next_column);
2339 if (!ret)
2340 lq_sta->search_better_tbl = 1;
2341 } else {
2342 IWL_DEBUG_RATE(mvm,
2343 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2344 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2345 }
2346
2347 /* If new "search" mode was selected, set up in uCode table */
2348 if (lq_sta->search_better_tbl) {
2349 /* Access the "search" table, clear its history. */
2350 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2351 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2352
2353 /* Use new "search" start rate */
2354 index = tbl->rate.index;
2355
2356 rs_dump_rate(mvm, &tbl->rate,
2357 "Switch to SEARCH TABLE:");
2358 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2359 } else {
2360 done_search = 1;
2361 }
2362 }
2363
2364 if (!ndp)
2365 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2366
2367 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2368 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2369 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2370 }
2371 }
2372
2373 struct rs_init_rate_info {
2374 s8 rssi;
2375 u8 rate_idx;
2376 };
2377
2378 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2379 { -60, IWL_RATE_54M_INDEX },
2380 { -64, IWL_RATE_48M_INDEX },
2381 { -68, IWL_RATE_36M_INDEX },
2382 { -80, IWL_RATE_24M_INDEX },
2383 { -84, IWL_RATE_18M_INDEX },
2384 { -85, IWL_RATE_12M_INDEX },
2385 { -86, IWL_RATE_11M_INDEX },
2386 { -88, IWL_RATE_5M_INDEX },
2387 { -90, IWL_RATE_2M_INDEX },
2388 { S8_MIN, IWL_RATE_1M_INDEX },
2389 };
2390
2391 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2392 { -60, IWL_RATE_54M_INDEX },
2393 { -64, IWL_RATE_48M_INDEX },
2394 { -72, IWL_RATE_36M_INDEX },
2395 { -80, IWL_RATE_24M_INDEX },
2396 { -84, IWL_RATE_18M_INDEX },
2397 { -85, IWL_RATE_12M_INDEX },
2398 { -87, IWL_RATE_9M_INDEX },
2399 { S8_MIN, IWL_RATE_6M_INDEX },
2400 };
2401
2402 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2403 { -60, IWL_RATE_MCS_7_INDEX },
2404 { -64, IWL_RATE_MCS_6_INDEX },
2405 { -68, IWL_RATE_MCS_5_INDEX },
2406 { -72, IWL_RATE_MCS_4_INDEX },
2407 { -80, IWL_RATE_MCS_3_INDEX },
2408 { -84, IWL_RATE_MCS_2_INDEX },
2409 { -85, IWL_RATE_MCS_1_INDEX },
2410 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2411 };
2412
2413 /* MCS index 9 is not valid for 20MHz VHT channel width,
2414 * but is ok for 40, 80 and 160MHz channels.
2415 */
2416 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2417 { -60, IWL_RATE_MCS_8_INDEX },
2418 { -64, IWL_RATE_MCS_7_INDEX },
2419 { -68, IWL_RATE_MCS_6_INDEX },
2420 { -72, IWL_RATE_MCS_5_INDEX },
2421 { -80, IWL_RATE_MCS_4_INDEX },
2422 { -84, IWL_RATE_MCS_3_INDEX },
2423 { -85, IWL_RATE_MCS_2_INDEX },
2424 { -87, IWL_RATE_MCS_1_INDEX },
2425 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2426 };
2427
2428 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2429 { -60, IWL_RATE_MCS_9_INDEX },
2430 { -64, IWL_RATE_MCS_8_INDEX },
2431 { -68, IWL_RATE_MCS_7_INDEX },
2432 { -72, IWL_RATE_MCS_6_INDEX },
2433 { -80, IWL_RATE_MCS_5_INDEX },
2434 { -84, IWL_RATE_MCS_4_INDEX },
2435 { -85, IWL_RATE_MCS_3_INDEX },
2436 { -87, IWL_RATE_MCS_2_INDEX },
2437 { -88, IWL_RATE_MCS_1_INDEX },
2438 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2439 };
2440
2441 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2442
2443 /* Init the optimal rate based on STA caps
2444 * This combined with rssi is used to report the last tx rate
2445 * to userspace when we haven't transmitted enough frames.
2446 */
2447 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2448 struct ieee80211_sta *sta,
2449 struct iwl_lq_sta *lq_sta)
2450 {
2451 struct rs_rate *rate = &lq_sta->optimal_rate;
2452
2453 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2454 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2455 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2456 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2457 else if (lq_sta->band == NL80211_BAND_5GHZ)
2458 rate->type = LQ_LEGACY_A;
2459 else
2460 rate->type = LQ_LEGACY_G;
2461
2462 rate->bw = rs_bw_from_sta_bw(sta);
2463 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2464
2465 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2466
2467 if (is_mimo(rate)) {
2468 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2469 } else if (is_siso(rate)) {
2470 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2471 } else {
2472 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2473
2474 if (lq_sta->band == NL80211_BAND_5GHZ) {
2475 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2476 lq_sta->optimal_nentries =
2477 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2478 } else {
2479 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2480 lq_sta->optimal_nentries =
2481 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2482 }
2483 }
2484
2485 if (is_vht(rate)) {
2486 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2487 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2488 lq_sta->optimal_nentries =
2489 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2490 } else {
2491 lq_sta->optimal_rates = rs_optimal_rates_vht;
2492 lq_sta->optimal_nentries =
2493 ARRAY_SIZE(rs_optimal_rates_vht);
2494 }
2495 } else if (is_ht(rate)) {
2496 lq_sta->optimal_rates = rs_optimal_rates_ht;
2497 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2498 }
2499 }
2500
2501 /* Compute the optimal rate index based on RSSI */
2502 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2503 struct iwl_lq_sta *lq_sta)
2504 {
2505 struct rs_rate *rate = &lq_sta->optimal_rate;
2506 int i;
2507
2508 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2509 BITS_PER_LONG);
2510
2511 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2512 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2513
2514 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2515 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2516 rate->index = rate_idx;
2517 break;
2518 }
2519 }
2520
2521 return rate;
2522 }
2523
2524 /* Choose an initial legacy rate and antenna to use based on the RSSI
2525 * of last Rx
2526 */
2527 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2528 struct ieee80211_sta *sta,
2529 struct iwl_lq_sta *lq_sta,
2530 enum nl80211_band band,
2531 struct rs_rate *rate)
2532 {
2533 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2534 int i, nentries;
2535 unsigned long active_rate;
2536 s8 best_rssi = S8_MIN;
2537 u8 best_ant = ANT_NONE;
2538 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2539 const struct rs_init_rate_info *initial_rates;
2540
2541 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2542 if (!(lq_sta->pers.chains & BIT(i)))
2543 continue;
2544
2545 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2546 best_rssi = lq_sta->pers.chain_signal[i];
2547 best_ant = BIT(i);
2548 }
2549 }
2550
2551 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2552 rs_pretty_ant(best_ant), best_rssi);
2553
2554 if (best_ant != ANT_A && best_ant != ANT_B)
2555 rate->ant = first_antenna(valid_tx_ant);
2556 else
2557 rate->ant = best_ant;
2558
2559 rate->sgi = false;
2560 rate->ldpc = false;
2561 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2562
2563 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2564 BITS_PER_LONG);
2565
2566 if (band == NL80211_BAND_5GHZ) {
2567 rate->type = LQ_LEGACY_A;
2568 initial_rates = rs_optimal_rates_5ghz_legacy;
2569 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2570 } else {
2571 rate->type = LQ_LEGACY_G;
2572 initial_rates = rs_optimal_rates_24ghz_legacy;
2573 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2574 }
2575
2576 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2577 goto out;
2578
2579 /* Start from a higher rate if the corresponding debug capability
2580 * is enabled. The rate is chosen according to AP capabilities.
2581 * In case of VHT/HT when the rssi is low fallback to the case of
2582 * legacy rates.
2583 */
2584 if (sta->vht_cap.vht_supported &&
2585 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2586 /*
2587 * In AP mode, when a new station associates, rs is initialized
2588 * immediately upon association completion, before the phy
2589 * context is updated with the association parameters, so the
2590 * sta bandwidth might be wider than the phy context allows.
2591 * To avoid this issue, always initialize rs with 20mhz
2592 * bandwidth rate, and after authorization, when the phy context
2593 * is already up-to-date, re-init rs with the correct bw.
2594 */
2595 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2596 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2597
2598 switch (bw) {
2599 case RATE_MCS_CHAN_WIDTH_40:
2600 case RATE_MCS_CHAN_WIDTH_80:
2601 case RATE_MCS_CHAN_WIDTH_160:
2602 initial_rates = rs_optimal_rates_vht;
2603 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2604 break;
2605 case RATE_MCS_CHAN_WIDTH_20:
2606 initial_rates = rs_optimal_rates_vht_20mhz;
2607 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2608 break;
2609 default:
2610 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2611 goto out;
2612 }
2613
2614 active_rate = lq_sta->active_siso_rate;
2615 rate->type = LQ_VHT_SISO;
2616 rate->bw = bw;
2617 } else if (sta->ht_cap.ht_supported &&
2618 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2619 initial_rates = rs_optimal_rates_ht;
2620 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2621 active_rate = lq_sta->active_siso_rate;
2622 rate->type = LQ_HT_SISO;
2623 } else {
2624 active_rate = lq_sta->active_legacy_rate;
2625 }
2626
2627 for (i = 0; i < nentries; i++) {
2628 int rate_idx = initial_rates[i].rate_idx;
2629
2630 if ((best_rssi >= initial_rates[i].rssi) &&
2631 (BIT(rate_idx) & active_rate)) {
2632 rate->index = rate_idx;
2633 break;
2634 }
2635 }
2636
2637 out:
2638 rs_dump_rate(mvm, rate, "INITIAL");
2639 }
2640
2641 /* Save info about RSSI of last Rx */
2642 void rs_update_last_rssi(struct iwl_mvm *mvm,
2643 struct iwl_mvm_sta *mvmsta,
2644 struct ieee80211_rx_status *rx_status)
2645 {
2646 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2647 int i;
2648
2649 lq_sta->pers.chains = rx_status->chains;
2650 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2651 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2652 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2653 lq_sta->pers.last_rssi = S8_MIN;
2654
2655 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2656 if (!(lq_sta->pers.chains & BIT(i)))
2657 continue;
2658
2659 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2660 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2661 }
2662 }
2663
2664 /**
2665 * rs_initialize_lq - Initialize a station's hardware rate table
2666 *
2667 * The uCode's station table contains a table of fallback rates
2668 * for automatic fallback during transmission.
2669 *
2670 * NOTE: This sets up a default set of values. These will be replaced later
2671 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2672 * rc80211_simple.
2673 *
2674 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2675 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2676 * which requires station table entry to exist).
2677 */
2678 static void rs_initialize_lq(struct iwl_mvm *mvm,
2679 struct ieee80211_sta *sta,
2680 struct iwl_lq_sta *lq_sta,
2681 enum nl80211_band band)
2682 {
2683 struct iwl_scale_tbl_info *tbl;
2684 struct rs_rate *rate;
2685 u8 active_tbl = 0;
2686
2687 if (!sta || !lq_sta)
2688 return;
2689
2690 if (!lq_sta->search_better_tbl)
2691 active_tbl = lq_sta->active_tbl;
2692 else
2693 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2694
2695 tbl = &(lq_sta->lq_info[active_tbl]);
2696 rate = &tbl->rate;
2697
2698 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2699 rs_init_optimal_rate(mvm, sta, lq_sta);
2700
2701 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2702 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2703 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2704 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2705
2706 tbl->column = rs_get_column_from_rate(rate);
2707
2708 rs_set_expected_tpt_table(lq_sta, tbl);
2709 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2710 /* TODO restore station should remember the lq cmd */
2711 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2712 }
2713
2714 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2715 void *mvm_sta,
2716 struct ieee80211_tx_rate_control *txrc)
2717 {
2718 struct iwl_op_mode *op_mode = mvm_r;
2719 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2720 struct sk_buff *skb = txrc->skb;
2721 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2722 struct iwl_lq_sta *lq_sta;
2723 struct rs_rate *optimal_rate;
2724 u32 last_ucode_rate;
2725
2726 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2727 /* if vif isn't initialized mvm doesn't know about
2728 * this station, so don't do anything with the it
2729 */
2730 sta = NULL;
2731 mvm_sta = NULL;
2732 }
2733
2734 if (!mvm_sta)
2735 return;
2736
2737 lq_sta = mvm_sta;
2738 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2739 info->band, &info->control.rates[0]);
2740 info->control.rates[0].count = 1;
2741
2742 /* Report the optimal rate based on rssi and STA caps if we haven't
2743 * converged yet (too little traffic) or exploring other modulations
2744 */
2745 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2746 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2747 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2748 optimal_rate);
2749 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2750 &txrc->reported_rate);
2751 }
2752 }
2753
2754 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2755 gfp_t gfp)
2756 {
2757 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2758 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2759 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2760 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2761
2762 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2763
2764 lq_sta->pers.drv = mvm;
2765 #ifdef CONFIG_MAC80211_DEBUGFS
2766 lq_sta->pers.dbg_fixed_rate = 0;
2767 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2768 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2769 #endif
2770 lq_sta->pers.chains = 0;
2771 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2772 lq_sta->pers.last_rssi = S8_MIN;
2773
2774 return lq_sta;
2775 }
2776
2777 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2778 int nss)
2779 {
2780 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2781 (0x3 << (2 * (nss - 1)));
2782 rx_mcs >>= (2 * (nss - 1));
2783
2784 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2785 return IWL_RATE_MCS_7_INDEX;
2786 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2787 return IWL_RATE_MCS_8_INDEX;
2788 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2789 return IWL_RATE_MCS_9_INDEX;
2790
2791 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2792 return -1;
2793 }
2794
2795 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2796 struct ieee80211_sta_vht_cap *vht_cap,
2797 struct iwl_lq_sta *lq_sta)
2798 {
2799 int i;
2800 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2801
2802 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2803 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2804 if (i == IWL_RATE_9M_INDEX)
2805 continue;
2806
2807 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2808 if (i == IWL_RATE_MCS_9_INDEX &&
2809 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2810 continue;
2811
2812 lq_sta->active_siso_rate |= BIT(i);
2813 }
2814 }
2815
2816 if (sta->rx_nss < 2)
2817 return;
2818
2819 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2820 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2821 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2822 if (i == IWL_RATE_9M_INDEX)
2823 continue;
2824
2825 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2826 if (i == IWL_RATE_MCS_9_INDEX &&
2827 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2828 continue;
2829
2830 lq_sta->active_mimo2_rate |= BIT(i);
2831 }
2832 }
2833 }
2834
2835 static void rs_ht_init(struct iwl_mvm *mvm,
2836 struct ieee80211_sta *sta,
2837 struct iwl_lq_sta *lq_sta,
2838 struct ieee80211_sta_ht_cap *ht_cap)
2839 {
2840 /* active_siso_rate mask includes 9 MBits (bit 5),
2841 * and CCK (bits 0-3), supp_rates[] does not;
2842 * shift to convert format, force 9 MBits off.
2843 */
2844 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2845 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2846 lq_sta->active_siso_rate &= ~((u16)0x2);
2847 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2848
2849 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2850 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2851 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2852 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2853
2854 if (mvm->cfg->ht_params->ldpc &&
2855 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2856 lq_sta->ldpc = true;
2857
2858 if (mvm->cfg->ht_params->stbc &&
2859 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2860 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2861 lq_sta->stbc_capable = true;
2862
2863 lq_sta->is_vht = false;
2864 }
2865
2866 static void rs_vht_init(struct iwl_mvm *mvm,
2867 struct ieee80211_sta *sta,
2868 struct iwl_lq_sta *lq_sta,
2869 struct ieee80211_sta_vht_cap *vht_cap)
2870 {
2871 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2872
2873 if (mvm->cfg->ht_params->ldpc &&
2874 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2875 lq_sta->ldpc = true;
2876
2877 if (mvm->cfg->ht_params->stbc &&
2878 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2879 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2880 lq_sta->stbc_capable = true;
2881
2882 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2883 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2884 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2885 lq_sta->bfer_capable = true;
2886
2887 lq_sta->is_vht = true;
2888 }
2889
2890 #ifdef CONFIG_IWLWIFI_DEBUGFS
2891 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2892 {
2893 spin_lock_bh(&mvm->drv_stats_lock);
2894 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2895 spin_unlock_bh(&mvm->drv_stats_lock);
2896 }
2897
2898 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2899 {
2900 u8 nss = 0;
2901
2902 spin_lock(&mvm->drv_stats_lock);
2903
2904 if (agg)
2905 mvm->drv_rx_stats.agg_frames++;
2906
2907 mvm->drv_rx_stats.success_frames++;
2908
2909 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2910 case RATE_MCS_CHAN_WIDTH_20:
2911 mvm->drv_rx_stats.bw_20_frames++;
2912 break;
2913 case RATE_MCS_CHAN_WIDTH_40:
2914 mvm->drv_rx_stats.bw_40_frames++;
2915 break;
2916 case RATE_MCS_CHAN_WIDTH_80:
2917 mvm->drv_rx_stats.bw_80_frames++;
2918 break;
2919 case RATE_MCS_CHAN_WIDTH_160:
2920 mvm->drv_rx_stats.bw_160_frames++;
2921 break;
2922 default:
2923 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2924 }
2925
2926 if (rate & RATE_MCS_HT_MSK) {
2927 mvm->drv_rx_stats.ht_frames++;
2928 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2929 } else if (rate & RATE_MCS_VHT_MSK) {
2930 mvm->drv_rx_stats.vht_frames++;
2931 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2932 RATE_VHT_MCS_NSS_POS) + 1;
2933 } else {
2934 mvm->drv_rx_stats.legacy_frames++;
2935 }
2936
2937 if (nss == 1)
2938 mvm->drv_rx_stats.siso_frames++;
2939 else if (nss == 2)
2940 mvm->drv_rx_stats.mimo2_frames++;
2941
2942 if (rate & RATE_MCS_SGI_MSK)
2943 mvm->drv_rx_stats.sgi_frames++;
2944 else
2945 mvm->drv_rx_stats.ngi_frames++;
2946
2947 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2948 mvm->drv_rx_stats.last_frame_idx =
2949 (mvm->drv_rx_stats.last_frame_idx + 1) %
2950 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2951
2952 spin_unlock(&mvm->drv_stats_lock);
2953 }
2954 #endif
2955
2956 /*
2957 * Called after adding a new station to initialize rate scaling
2958 */
2959 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2960 enum nl80211_band band)
2961 {
2962 int i, j;
2963 struct ieee80211_hw *hw = mvm->hw;
2964 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2965 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2966 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2967 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2968 struct ieee80211_supported_band *sband;
2969 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2970
2971 lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock);
2972
2973 /* clear all non-persistent lq data */
2974 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2975
2976 sband = hw->wiphy->bands[band];
2977
2978 lq_sta->lq.sta_id = mvmsta->sta_id;
2979 mvmsta->amsdu_enabled = 0;
2980 mvmsta->max_amsdu_len = sta->max_amsdu_len;
2981
2982 for (j = 0; j < LQ_SIZE; j++)
2983 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2984
2985 lq_sta->flush_timer = 0;
2986 lq_sta->last_tx = jiffies;
2987
2988 IWL_DEBUG_RATE(mvm,
2989 "LQ: *** rate scale station global init for station %d ***\n",
2990 mvmsta->sta_id);
2991 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2992 * the lowest or the highest rate.. Could consider using RSSI from
2993 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2994 * after assoc.. */
2995
2996 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2997 lq_sta->band = sband->band;
2998 /*
2999 * active legacy rates as per supported rates bitmap
3000 */
3001 supp = sta->supp_rates[sband->band];
3002 lq_sta->active_legacy_rate = 0;
3003 for_each_set_bit(i, &supp, BITS_PER_LONG)
3004 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3005
3006 /* TODO: should probably account for rx_highest for both HT/VHT */
3007 if (!vht_cap || !vht_cap->vht_supported)
3008 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3009 else
3010 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3011
3012 lq_sta->max_legacy_rate_idx =
3013 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3014 lq_sta->max_siso_rate_idx =
3015 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3016 lq_sta->max_mimo2_rate_idx =
3017 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3018
3019 IWL_DEBUG_RATE(mvm,
3020 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3021 lq_sta->active_legacy_rate,
3022 lq_sta->active_siso_rate,
3023 lq_sta->active_mimo2_rate,
3024 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3025 lq_sta->bfer_capable);
3026 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3027 lq_sta->max_legacy_rate_idx,
3028 lq_sta->max_siso_rate_idx,
3029 lq_sta->max_mimo2_rate_idx);
3030
3031 /* These values will be overridden later */
3032 lq_sta->lq.single_stream_ant_msk =
3033 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
3034 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3035
3036 /* as default allow aggregation for all tids */
3037 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3038 lq_sta->is_agg = 0;
3039 #ifdef CONFIG_IWLWIFI_DEBUGFS
3040 iwl_mvm_reset_frame_stats(mvm);
3041 #endif
3042 rs_initialize_lq(mvm, sta, lq_sta, band);
3043 }
3044
3045 static void rs_drv_rate_update(void *mvm_r,
3046 struct ieee80211_supported_band *sband,
3047 struct cfg80211_chan_def *chandef,
3048 struct ieee80211_sta *sta,
3049 void *priv_sta, u32 changed)
3050 {
3051 struct iwl_op_mode *op_mode = mvm_r;
3052 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3053 u8 tid;
3054
3055 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3056 return;
3057
3058 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3059 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3060 ieee80211_stop_tx_ba_session(sta, tid);
3061
3062 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3063 }
3064
3065 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3066 struct ieee80211_sta *sta,
3067 int tid, struct ieee80211_tx_info *info,
3068 bool ndp)
3069 {
3070 int legacy_success;
3071 int retries;
3072 int i;
3073 struct iwl_lq_cmd *table;
3074 u32 lq_hwrate;
3075 struct rs_rate lq_rate, tx_resp_rate;
3076 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3077 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3078 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3079 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3080 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3081 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3082 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3083
3084 if (!lq_sta->pers.drv) {
3085 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3086 return;
3087 }
3088
3089 /* This packet was aggregated but doesn't carry status info */
3090 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3091 !(info->flags & IEEE80211_TX_STAT_AMPDU))
3092 return;
3093
3094 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3095 &tx_resp_rate)) {
3096 WARN_ON_ONCE(1);
3097 return;
3098 }
3099
3100 #ifdef CONFIG_MAC80211_DEBUGFS
3101 /* Disable last tx check if we are debugging with fixed rate but
3102 * update tx stats
3103 */
3104 if (lq_sta->pers.dbg_fixed_rate) {
3105 int index = tx_resp_rate.index;
3106 enum rs_column column;
3107 int attempts, success;
3108
3109 column = rs_get_column_from_rate(&tx_resp_rate);
3110 if (WARN_ONCE(column == RS_COLUMN_INVALID,
3111 "Can't map rate 0x%x to column",
3112 tx_resp_hwrate))
3113 return;
3114
3115 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3116 attempts = info->status.ampdu_len;
3117 success = info->status.ampdu_ack_len;
3118 } else {
3119 attempts = info->status.rates[0].count;
3120 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3121 }
3122
3123 lq_sta->pers.tx_stats[column][index].total += attempts;
3124 lq_sta->pers.tx_stats[column][index].success += success;
3125
3126 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3127 tx_resp_hwrate, success, attempts);
3128 return;
3129 }
3130 #endif
3131
3132 if (time_after(jiffies,
3133 (unsigned long)(lq_sta->last_tx +
3134 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3135 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3136 /* reach here only in case of driver RS, call directly
3137 * the unlocked version
3138 */
3139 rs_drv_rate_init(mvm, sta, info->band);
3140 return;
3141 }
3142 lq_sta->last_tx = jiffies;
3143
3144 /* Ignore this Tx frame response if its initial rate doesn't match
3145 * that of latest Link Quality command. There may be stragglers
3146 * from a previous Link Quality command, but we're no longer interested
3147 * in those; they're either from the "active" mode while we're trying
3148 * to check "search" mode, or a prior "search" mode after we've moved
3149 * to a new "search" mode (which might become the new "active" mode).
3150 */
3151 table = &lq_sta->lq;
3152 lq_hwrate = le32_to_cpu(table->rs_table[0]);
3153 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3154 WARN_ON_ONCE(1);
3155 return;
3156 }
3157
3158 /* Here we actually compare this rate to the latest LQ command */
3159 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3160 IWL_DEBUG_RATE(mvm,
3161 "tx resp color 0x%x does not match 0x%x\n",
3162 lq_color, LQ_FLAG_COLOR_GET(table->flags));
3163
3164 /* Since rates mis-match, the last LQ command may have failed.
3165 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3166 * ... driver.
3167 */
3168 lq_sta->missed_rate_counter++;
3169 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3170 lq_sta->missed_rate_counter = 0;
3171 IWL_DEBUG_RATE(mvm,
3172 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3173 lq_sta->rs_state);
3174 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3175 }
3176 /* Regardless, ignore this status info for outdated rate */
3177 return;
3178 }
3179
3180 /* Rate did match, so reset the missed_rate_counter */
3181 lq_sta->missed_rate_counter = 0;
3182
3183 if (!lq_sta->search_better_tbl) {
3184 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3185 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3186 } else {
3187 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3188 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3189 }
3190
3191 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3192 IWL_DEBUG_RATE(mvm,
3193 "Neither active nor search matches tx rate\n");
3194 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3195 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3196 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3197 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3198 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3199
3200 /* no matching table found, let's by-pass the data collection
3201 * and continue to perform rate scale to find the rate table
3202 */
3203 rs_stay_in_table(lq_sta, true);
3204 goto done;
3205 }
3206
3207 /* Updating the frame history depends on whether packets were
3208 * aggregated.
3209 *
3210 * For aggregation, all packets were transmitted at the same rate, the
3211 * first index into rate scale table.
3212 */
3213 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3214 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3215 info->status.ampdu_len,
3216 info->status.ampdu_ack_len,
3217 reduced_txp);
3218
3219 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3220 * it as a single frame loss as we don't want the success ratio
3221 * to dip too quickly because a BA wasn't received.
3222 * For TPC, there's no need for this optimisation since we want
3223 * to recover very quickly from a bad power reduction and,
3224 * therefore we'd like the success ratio to get an immediate hit
3225 * when failing to get a BA, so we'd switch back to a lower or
3226 * zero power reduction. When FW transmits agg with a rate
3227 * different from the initial rate, it will not use reduced txp
3228 * and will send BA notification twice (one empty with reduced
3229 * txp equal to the value from LQ and one with reduced txp 0).
3230 * We need to update counters for each txp level accordingly.
3231 */
3232 if (info->status.ampdu_ack_len == 0)
3233 info->status.ampdu_len = 1;
3234
3235 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3236 tx_resp_rate.index,
3237 info->status.ampdu_len,
3238 info->status.ampdu_ack_len);
3239
3240 /* Update success/fail counts if not searching for new mode */
3241 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3242 lq_sta->total_success += info->status.ampdu_ack_len;
3243 lq_sta->total_failed += (info->status.ampdu_len -
3244 info->status.ampdu_ack_len);
3245 }
3246 } else {
3247 /* For legacy, update frame history with for each Tx retry. */
3248 retries = info->status.rates[0].count - 1;
3249 /* HW doesn't send more than 15 retries */
3250 retries = min(retries, 15);
3251
3252 /* The last transmission may have been successful */
3253 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3254 /* Collect data for each rate used during failed TX attempts */
3255 for (i = 0; i <= retries; ++i) {
3256 lq_hwrate = le32_to_cpu(table->rs_table[i]);
3257 if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3258 &lq_rate)) {
3259 WARN_ON_ONCE(1);
3260 return;
3261 }
3262
3263 /* Only collect stats if retried rate is in the same RS
3264 * table as active/search.
3265 */
3266 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3267 tmp_tbl = curr_tbl;
3268 else if (rs_rate_column_match(&lq_rate,
3269 &other_tbl->rate))
3270 tmp_tbl = other_tbl;
3271 else
3272 continue;
3273
3274 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3275 tx_resp_rate.index, 1,
3276 i < retries ? 0 : legacy_success,
3277 reduced_txp);
3278 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3279 tx_resp_rate.index, 1,
3280 i < retries ? 0 : legacy_success);
3281 }
3282
3283 /* Update success/fail counts if not searching for new mode */
3284 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3285 lq_sta->total_success += legacy_success;
3286 lq_sta->total_failed += retries + (1 - legacy_success);
3287 }
3288 }
3289 /* The last TX rate is cached in lq_sta; it's set in if/else above */
3290 lq_sta->last_rate_n_flags = lq_hwrate;
3291 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3292 done:
3293 /* See if there's a better rate or modulation mode to try. */
3294 if (sta->supp_rates[info->band])
3295 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3296 }
3297
3298 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3299 int tid, struct ieee80211_tx_info *info, bool ndp)
3300 {
3301 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3302
3303 /* If it's locked we are in middle of init flow
3304 * just wait for next tx status to update the lq_sta data
3305 */
3306 if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock))
3307 return;
3308
3309 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3310 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
3311 }
3312
3313 #ifdef CONFIG_MAC80211_DEBUGFS
3314 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3315 struct iwl_lq_cmd *lq_cmd,
3316 enum nl80211_band band,
3317 u32 ucode_rate)
3318 {
3319 struct rs_rate rate;
3320 int i;
3321 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3322 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3323 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3324
3325 for (i = 0; i < num_rates; i++)
3326 lq_cmd->rs_table[i] = ucode_rate_le32;
3327
3328 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3329 WARN_ON_ONCE(1);
3330 return;
3331 }
3332
3333 if (is_mimo(&rate))
3334 lq_cmd->mimo_delim = num_rates - 1;
3335 else
3336 lq_cmd->mimo_delim = 0;
3337
3338 lq_cmd->reduced_tpc = 0;
3339
3340 if (num_of_ant(ant) == 1)
3341 lq_cmd->single_stream_ant_msk = ant;
3342
3343 if (!mvm->trans->trans_cfg->gen2)
3344 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3345 else
3346 lq_cmd->agg_frame_cnt_limit =
3347 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3348 }
3349 #endif /* CONFIG_MAC80211_DEBUGFS */
3350
3351 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3352 struct iwl_lq_sta *lq_sta,
3353 struct rs_rate *rate,
3354 __le32 *rs_table, int *rs_table_index,
3355 int num_rates, int num_retries,
3356 u8 valid_tx_ant, bool toggle_ant)
3357 {
3358 int i, j;
3359 __le32 ucode_rate;
3360 bool bottom_reached = false;
3361 int prev_rate_idx = rate->index;
3362 int end = LINK_QUAL_MAX_RETRY_NUM;
3363 int index = *rs_table_index;
3364
3365 for (i = 0; i < num_rates && index < end; i++) {
3366 for (j = 0; j < num_retries && index < end; j++, index++) {
3367 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3368 rate));
3369 rs_table[index] = ucode_rate;
3370 if (toggle_ant)
3371 rs_toggle_antenna(valid_tx_ant, rate);
3372 }
3373
3374 prev_rate_idx = rate->index;
3375 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3376 if (bottom_reached && !is_legacy(rate))
3377 break;
3378 }
3379
3380 if (!bottom_reached && !is_legacy(rate))
3381 rate->index = prev_rate_idx;
3382
3383 *rs_table_index = index;
3384 }
3385
3386 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3387 * column the rate table should look like this:
3388 *
3389 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3390 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3391 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3392 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3393 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3394 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3395 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3396 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3397 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3398 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3399 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3400 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3401 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3402 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3403 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3404 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3405 */
3406 static void rs_build_rates_table(struct iwl_mvm *mvm,
3407 struct ieee80211_sta *sta,
3408 struct iwl_lq_sta *lq_sta,
3409 const struct rs_rate *initial_rate)
3410 {
3411 struct rs_rate rate;
3412 int num_rates, num_retries, index = 0;
3413 u8 valid_tx_ant = 0;
3414 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3415 bool toggle_ant = false;
3416 u32 color;
3417
3418 memcpy(&rate, initial_rate, sizeof(rate));
3419
3420 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3421
3422 /* TODO: remove old API when min FW API hits 14 */
3423 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3424 rs_stbc_allow(mvm, sta, lq_sta))
3425 rate.stbc = true;
3426
3427 if (is_siso(&rate)) {
3428 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3429 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3430 } else if (is_mimo(&rate)) {
3431 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3432 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3433 } else {
3434 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3435 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3436 toggle_ant = true;
3437 }
3438
3439 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3440 num_rates, num_retries, valid_tx_ant,
3441 toggle_ant);
3442
3443 rs_get_lower_rate_down_column(lq_sta, &rate);
3444
3445 if (is_siso(&rate)) {
3446 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3447 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3448 lq_cmd->mimo_delim = index;
3449 } else if (is_legacy(&rate)) {
3450 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3451 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3452 } else {
3453 WARN_ON_ONCE(1);
3454 }
3455
3456 toggle_ant = true;
3457
3458 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3459 num_rates, num_retries, valid_tx_ant,
3460 toggle_ant);
3461
3462 rs_get_lower_rate_down_column(lq_sta, &rate);
3463
3464 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3465 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3466
3467 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3468 num_rates, num_retries, valid_tx_ant,
3469 toggle_ant);
3470
3471 /* update the color of the LQ command (as a counter at bits 1-3) */
3472 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3473 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3474 }
3475
3476 struct rs_bfer_active_iter_data {
3477 struct ieee80211_sta *exclude_sta;
3478 struct iwl_mvm_sta *bfer_mvmsta;
3479 };
3480
3481 static void rs_bfer_active_iter(void *_data,
3482 struct ieee80211_sta *sta)
3483 {
3484 struct rs_bfer_active_iter_data *data = _data;
3485 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3486 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3487 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3488
3489 if (sta == data->exclude_sta)
3490 return;
3491
3492 /* The current sta has BFER allowed */
3493 if (ss_params & LQ_SS_BFER_ALLOWED) {
3494 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3495
3496 data->bfer_mvmsta = mvmsta;
3497 }
3498 }
3499
3500 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3501 {
3502 int prio = -1;
3503 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3504
3505 switch (viftype) {
3506 case NL80211_IFTYPE_AP:
3507 case NL80211_IFTYPE_P2P_GO:
3508 prio = 3;
3509 break;
3510 case NL80211_IFTYPE_P2P_CLIENT:
3511 prio = 2;
3512 break;
3513 case NL80211_IFTYPE_STATION:
3514 prio = 1;
3515 break;
3516 default:
3517 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3518 prio = -1;
3519 }
3520
3521 return prio;
3522 }
3523
3524 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3525 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3526 struct iwl_mvm_sta *sta2)
3527 {
3528 int prio1 = rs_bfer_priority(sta1);
3529 int prio2 = rs_bfer_priority(sta2);
3530
3531 if (prio1 > prio2)
3532 return 1;
3533 if (prio1 < prio2)
3534 return -1;
3535 return 0;
3536 }
3537
3538 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3539 struct ieee80211_sta *sta,
3540 struct iwl_lq_sta *lq_sta,
3541 const struct rs_rate *initial_rate)
3542 {
3543 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3544 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3545 struct rs_bfer_active_iter_data data = {
3546 .exclude_sta = sta,
3547 .bfer_mvmsta = NULL,
3548 };
3549 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3550 u32 ss_params = LQ_SS_PARAMS_VALID;
3551
3552 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3553 goto out;
3554
3555 #ifdef CONFIG_MAC80211_DEBUGFS
3556 /* Check if forcing the decision is configured.
3557 * Note that SISO is forced by not allowing STBC or BFER
3558 */
3559 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3560 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3561 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3562 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3563
3564 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3565 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3566 lq_sta->pers.ss_force);
3567 goto out;
3568 }
3569 #endif
3570
3571 if (lq_sta->stbc_capable)
3572 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3573
3574 if (!lq_sta->bfer_capable)
3575 goto out;
3576
3577 ieee80211_iterate_stations_atomic(mvm->hw,
3578 rs_bfer_active_iter,
3579 &data);
3580 bfer_mvmsta = data.bfer_mvmsta;
3581
3582 /* This code is safe as it doesn't run concurrently for different
3583 * stations. This is guaranteed by the fact that calls to
3584 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3585 */
3586 if (!bfer_mvmsta) {
3587 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3588
3589 ss_params |= LQ_SS_BFER_ALLOWED;
3590 goto out;
3591 }
3592
3593 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3594 bfer_mvmsta->sta_id);
3595
3596 /* Disallow BFER on another STA if active and we're a higher priority */
3597 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3598 struct iwl_lq_cmd *bfersta_lq_cmd =
3599 &bfer_mvmsta->lq_sta.rs_drv.lq;
3600 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3601
3602 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3603 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3604 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3605
3606 ss_params |= LQ_SS_BFER_ALLOWED;
3607 IWL_DEBUG_RATE(mvm,
3608 "Lower priority BFER sta found (%d). Switch BFER\n",
3609 bfer_mvmsta->sta_id);
3610 }
3611 out:
3612 lq_cmd->ss_params = cpu_to_le32(ss_params);
3613 }
3614
3615 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3616 struct ieee80211_sta *sta,
3617 struct iwl_lq_sta *lq_sta,
3618 const struct rs_rate *initial_rate)
3619 {
3620 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3621 struct iwl_mvm_sta *mvmsta;
3622 struct iwl_mvm_vif *mvmvif;
3623
3624 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3625 lq_cmd->agg_time_limit =
3626 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3627
3628 #ifdef CONFIG_MAC80211_DEBUGFS
3629 if (lq_sta->pers.dbg_fixed_rate) {
3630 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3631 lq_sta->band,
3632 lq_sta->pers.dbg_fixed_rate);
3633 return;
3634 }
3635 #endif
3636 if (WARN_ON_ONCE(!sta || !initial_rate))
3637 return;
3638
3639 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3640
3641 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3642 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3643
3644 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3645 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3646
3647 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3648 num_of_ant(initial_rate->ant) == 1)
3649 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3650
3651 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3652
3653 /*
3654 * In case of low latency, tell the firmware to leave a frame in the
3655 * Tx Fifo so that it can start a transaction in the same TxOP. This
3656 * basically allows the firmware to send bursts.
3657 */
3658 if (iwl_mvm_vif_low_latency(mvmvif))
3659 lq_cmd->agg_frame_cnt_limit--;
3660
3661 if (mvmsta->vif->p2p)
3662 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3663
3664 lq_cmd->agg_time_limit =
3665 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3666 }
3667
3668 static void *rs_alloc(struct ieee80211_hw *hw)
3669 {
3670 return hw->priv;
3671 }
3672
3673 /* rate scale requires free function to be implemented */
3674 static void rs_free(void *mvm_rate)
3675 {
3676 return;
3677 }
3678
3679 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3680 {
3681 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3682 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3683
3684 IWL_DEBUG_RATE(mvm, "enter\n");
3685 IWL_DEBUG_RATE(mvm, "leave\n");
3686 }
3687
3688 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3689 {
3690
3691 char *type, *bw;
3692 u8 mcs = 0, nss = 0;
3693 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3694
3695 if (!(rate & RATE_MCS_HT_MSK) &&
3696 !(rate & RATE_MCS_VHT_MSK) &&
3697 !(rate & RATE_MCS_HE_MSK)) {
3698 int index = iwl_hwrate_to_plcp_idx(rate);
3699
3700 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3701 rs_pretty_ant(ant),
3702 index == IWL_RATE_INVALID ? "BAD" :
3703 iwl_rate_mcs[index].mbps);
3704 }
3705
3706 if (rate & RATE_MCS_VHT_MSK) {
3707 type = "VHT";
3708 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3709 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3710 >> RATE_VHT_MCS_NSS_POS) + 1;
3711 } else if (rate & RATE_MCS_HT_MSK) {
3712 type = "HT";
3713 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3714 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3715 >> RATE_HT_MCS_NSS_POS) + 1;
3716 } else if (rate & RATE_MCS_HE_MSK) {
3717 type = "HE";
3718 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3719 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3720 >> RATE_VHT_MCS_NSS_POS) + 1;
3721 } else {
3722 type = "Unknown"; /* shouldn't happen */
3723 }
3724
3725 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3726 case RATE_MCS_CHAN_WIDTH_20:
3727 bw = "20Mhz";
3728 break;
3729 case RATE_MCS_CHAN_WIDTH_40:
3730 bw = "40Mhz";
3731 break;
3732 case RATE_MCS_CHAN_WIDTH_80:
3733 bw = "80Mhz";
3734 break;
3735 case RATE_MCS_CHAN_WIDTH_160:
3736 bw = "160Mhz";
3737 break;
3738 default:
3739 bw = "BAD BW";
3740 }
3741
3742 return scnprintf(buf, bufsz,
3743 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s",
3744 rate, type, rs_pretty_ant(ant), bw, mcs, nss,
3745 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3746 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3747 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3748 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3749 }
3750
3751 #ifdef CONFIG_MAC80211_DEBUGFS
3752 /**
3753 * Program the device to use fixed rate for frame transmit
3754 * This is for debugging/testing only
3755 * once the device start use fixed rate, we need to reload the module
3756 * to being back the normal operation.
3757 */
3758 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3759 struct iwl_lq_sta *lq_sta)
3760 {
3761 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3762 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3763 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3764
3765 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3766 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3767
3768 if (lq_sta->pers.dbg_fixed_rate) {
3769 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3770 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3771 }
3772 }
3773
3774 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3775 const char __user *user_buf, size_t count, loff_t *ppos)
3776 {
3777 struct iwl_lq_sta *lq_sta = file->private_data;
3778 struct iwl_mvm *mvm;
3779 char buf[64];
3780 size_t buf_size;
3781 u32 parsed_rate;
3782
3783 mvm = lq_sta->pers.drv;
3784 memset(buf, 0, sizeof(buf));
3785 buf_size = min(count, sizeof(buf) - 1);
3786 if (copy_from_user(buf, user_buf, buf_size))
3787 return -EFAULT;
3788
3789 if (sscanf(buf, "%x", &parsed_rate) == 1)
3790 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3791 else
3792 lq_sta->pers.dbg_fixed_rate = 0;
3793
3794 rs_program_fix_rate(mvm, lq_sta);
3795
3796 return count;
3797 }
3798
3799 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3800 char __user *user_buf, size_t count, loff_t *ppos)
3801 {
3802 char *buff;
3803 int desc = 0;
3804 int i = 0;
3805 ssize_t ret;
3806 static const size_t bufsz = 2048;
3807
3808 struct iwl_lq_sta *lq_sta = file->private_data;
3809 struct iwl_mvm_sta *mvmsta =
3810 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3811 struct iwl_mvm *mvm;
3812 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3813 struct rs_rate *rate = &tbl->rate;
3814 u32 ss_params;
3815
3816 mvm = lq_sta->pers.drv;
3817 buff = kmalloc(bufsz, GFP_KERNEL);
3818 if (!buff)
3819 return -ENOMEM;
3820
3821 desc += scnprintf(buff + desc, bufsz - desc,
3822 "sta_id %d\n", lq_sta->lq.sta_id);
3823 desc += scnprintf(buff + desc, bufsz - desc,
3824 "failed=%d success=%d rate=0%lX\n",
3825 lq_sta->total_failed, lq_sta->total_success,
3826 lq_sta->active_legacy_rate);
3827 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3828 lq_sta->pers.dbg_fixed_rate);
3829 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3830 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3831 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3832 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3833 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3834 (is_legacy(rate)) ? "legacy" :
3835 is_vht(rate) ? "VHT" : "HT");
3836 if (!is_legacy(rate)) {
3837 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3838 (is_siso(rate)) ? "SISO" : "MIMO2");
3839 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3840 (is_ht20(rate)) ? "20MHz" :
3841 (is_ht40(rate)) ? "40MHz" :
3842 (is_ht80(rate)) ? "80MHz" :
3843 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3844 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3845 (rate->sgi) ? "SGI" : "NGI",
3846 (rate->ldpc) ? "LDPC" : "BCC",
3847 (lq_sta->is_agg) ? "AGG on" : "",
3848 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3849 }
3850 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3851 lq_sta->last_rate_n_flags);
3852 desc += scnprintf(buff + desc, bufsz - desc,
3853 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3854 lq_sta->lq.flags,
3855 lq_sta->lq.mimo_delim,
3856 lq_sta->lq.single_stream_ant_msk,
3857 lq_sta->lq.dual_stream_ant_msk);
3858
3859 desc += scnprintf(buff + desc, bufsz - desc,
3860 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3861 le16_to_cpu(lq_sta->lq.agg_time_limit),
3862 lq_sta->lq.agg_disable_start_th,
3863 lq_sta->lq.agg_frame_cnt_limit);
3864
3865 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3866 lq_sta->lq.reduced_tpc);
3867 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3868 desc += scnprintf(buff + desc, bufsz - desc,
3869 "single stream params: %s%s%s%s\n",
3870 (ss_params & LQ_SS_PARAMS_VALID) ?
3871 "VALID" : "INVALID",
3872 (ss_params & LQ_SS_BFER_ALLOWED) ?
3873 ", BFER" : "",
3874 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3875 ", STBC" : "",
3876 (ss_params & LQ_SS_FORCE) ?
3877 ", FORCE" : "");
3878 desc += scnprintf(buff + desc, bufsz - desc,
3879 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3880 lq_sta->lq.initial_rate_index[0],
3881 lq_sta->lq.initial_rate_index[1],
3882 lq_sta->lq.initial_rate_index[2],
3883 lq_sta->lq.initial_rate_index[3]);
3884
3885 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3886 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3887
3888 desc += scnprintf(buff + desc, bufsz - desc,
3889 " rate[%d] 0x%X ", i, r);
3890 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3891 if (desc < bufsz - 1)
3892 buff[desc++] = '\n';
3893 }
3894
3895 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3896 kfree(buff);
3897 return ret;
3898 }
3899
3900 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3901 .write = rs_sta_dbgfs_scale_table_write,
3902 .read = rs_sta_dbgfs_scale_table_read,
3903 .open = simple_open,
3904 .llseek = default_llseek,
3905 };
3906 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3907 char __user *user_buf, size_t count, loff_t *ppos)
3908 {
3909 char *buff;
3910 int desc = 0;
3911 int i, j;
3912 ssize_t ret;
3913 struct iwl_scale_tbl_info *tbl;
3914 struct rs_rate *rate;
3915 struct iwl_lq_sta *lq_sta = file->private_data;
3916
3917 buff = kmalloc(1024, GFP_KERNEL);
3918 if (!buff)
3919 return -ENOMEM;
3920
3921 for (i = 0; i < LQ_SIZE; i++) {
3922 tbl = &(lq_sta->lq_info[i]);
3923 rate = &tbl->rate;
3924 desc += sprintf(buff+desc,
3925 "%s type=%d SGI=%d BW=%s DUP=0\n"
3926 "index=%d\n",
3927 lq_sta->active_tbl == i ? "*" : "x",
3928 rate->type,
3929 rate->sgi,
3930 is_ht20(rate) ? "20MHz" :
3931 is_ht40(rate) ? "40MHz" :
3932 is_ht80(rate) ? "80MHz" :
3933 is_ht160(rate) ? "160MHz" : "ERR",
3934 rate->index);
3935 for (j = 0; j < IWL_RATE_COUNT; j++) {
3936 desc += sprintf(buff+desc,
3937 "counter=%d success=%d %%=%d\n",
3938 tbl->win[j].counter,
3939 tbl->win[j].success_counter,
3940 tbl->win[j].success_ratio);
3941 }
3942 }
3943 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3944 kfree(buff);
3945 return ret;
3946 }
3947
3948 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3949 .read = rs_sta_dbgfs_stats_table_read,
3950 .open = simple_open,
3951 .llseek = default_llseek,
3952 };
3953
3954 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3955 char __user *user_buf,
3956 size_t count, loff_t *ppos)
3957 {
3958 static const char * const column_name[] = {
3959 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3960 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3961 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3962 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3963 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3964 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3965 [RS_COLUMN_MIMO2] = "MIMO2",
3966 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3967 };
3968
3969 static const char * const rate_name[] = {
3970 [IWL_RATE_1M_INDEX] = "1M",
3971 [IWL_RATE_2M_INDEX] = "2M",
3972 [IWL_RATE_5M_INDEX] = "5.5M",
3973 [IWL_RATE_11M_INDEX] = "11M",
3974 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3975 [IWL_RATE_9M_INDEX] = "9M",
3976 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3977 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3978 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3979 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3980 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3981 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3982 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3983 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3984 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3985 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3986 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3987 };
3988
3989 char *buff, *pos, *endpos;
3990 int col, rate;
3991 ssize_t ret;
3992 struct iwl_lq_sta *lq_sta = file->private_data;
3993 struct rs_rate_stats *stats;
3994 static const size_t bufsz = 1024;
3995
3996 buff = kmalloc(bufsz, GFP_KERNEL);
3997 if (!buff)
3998 return -ENOMEM;
3999
4000 pos = buff;
4001 endpos = pos + bufsz;
4002
4003 pos += scnprintf(pos, endpos - pos, "COLUMN,");
4004 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
4005 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
4006 pos += scnprintf(pos, endpos - pos, "\n");
4007
4008 for (col = 0; col < RS_COLUMN_COUNT; col++) {
4009 pos += scnprintf(pos, endpos - pos,
4010 "%s,", column_name[col]);
4011
4012 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
4013 stats = &(lq_sta->pers.tx_stats[col][rate]);
4014 pos += scnprintf(pos, endpos - pos,
4015 "%llu/%llu,",
4016 stats->success,
4017 stats->total);
4018 }
4019 pos += scnprintf(pos, endpos - pos, "\n");
4020 }
4021
4022 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
4023 kfree(buff);
4024 return ret;
4025 }
4026
4027 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
4028 const char __user *user_buf,
4029 size_t count, loff_t *ppos)
4030 {
4031 struct iwl_lq_sta *lq_sta = file->private_data;
4032 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
4033
4034 return count;
4035 }
4036
4037 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
4038 .read = rs_sta_dbgfs_drv_tx_stats_read,
4039 .write = rs_sta_dbgfs_drv_tx_stats_write,
4040 .open = simple_open,
4041 .llseek = default_llseek,
4042 };
4043
4044 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
4045 char __user *user_buf,
4046 size_t count, loff_t *ppos)
4047 {
4048 struct iwl_lq_sta *lq_sta = file->private_data;
4049 char buf[12];
4050 int bufsz = sizeof(buf);
4051 int pos = 0;
4052 static const char * const ss_force_name[] = {
4053 [RS_SS_FORCE_NONE] = "none",
4054 [RS_SS_FORCE_STBC] = "stbc",
4055 [RS_SS_FORCE_BFER] = "bfer",
4056 [RS_SS_FORCE_SISO] = "siso",
4057 };
4058
4059 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4060 ss_force_name[lq_sta->pers.ss_force]);
4061 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4062 }
4063
4064 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4065 size_t count, loff_t *ppos)
4066 {
4067 struct iwl_mvm *mvm = lq_sta->pers.drv;
4068 int ret = 0;
4069
4070 if (!strncmp("none", buf, 4)) {
4071 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4072 } else if (!strncmp("siso", buf, 4)) {
4073 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4074 } else if (!strncmp("stbc", buf, 4)) {
4075 if (lq_sta->stbc_capable) {
4076 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4077 } else {
4078 IWL_ERR(mvm,
4079 "can't force STBC. peer doesn't support\n");
4080 ret = -EINVAL;
4081 }
4082 } else if (!strncmp("bfer", buf, 4)) {
4083 if (lq_sta->bfer_capable) {
4084 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4085 } else {
4086 IWL_ERR(mvm,
4087 "can't force BFER. peer doesn't support\n");
4088 ret = -EINVAL;
4089 }
4090 } else {
4091 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4092 ret = -EINVAL;
4093 }
4094 return ret ?: count;
4095 }
4096
4097 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4098 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4099 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
4100 debugfs_create_file(#name, mode, parent, lq_sta, \
4101 &iwl_dbgfs_##name##_ops); \
4102 } while (0)
4103
4104 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4105
4106 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4107 struct dentry *dir)
4108 {
4109 struct iwl_lq_sta *lq_sta = priv_sta;
4110 struct iwl_mvm_sta *mvmsta;
4111
4112 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4113
4114 if (!mvmsta->vif)
4115 return;
4116
4117 debugfs_create_file("rate_scale_table", 0600, dir,
4118 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4119 debugfs_create_file("rate_stats_table", 0400, dir,
4120 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4121 debugfs_create_file("drv_tx_stats", 0600, dir,
4122 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4123 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4124 &lq_sta->tx_agg_tid_en);
4125 debugfs_create_u8("reduced_tpc", 0600, dir,
4126 &lq_sta->pers.dbg_fixed_txp_reduction);
4127
4128 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4129 }
4130 #endif
4131
4132 /*
4133 * Initialization of rate scaling information is done by driver after
4134 * the station is added. Since mac80211 calls this function before a
4135 * station is added we ignore it.
4136 */
4137 static void rs_rate_init_ops(void *mvm_r,
4138 struct ieee80211_supported_band *sband,
4139 struct cfg80211_chan_def *chandef,
4140 struct ieee80211_sta *sta, void *mvm_sta)
4141 {
4142 }
4143
4144 /* ops for rate scaling implemented in the driver */
4145 static const struct rate_control_ops rs_mvm_ops_drv = {
4146 .name = RS_NAME,
4147 .tx_status = rs_drv_mac80211_tx_status,
4148 .get_rate = rs_drv_get_rate,
4149 .rate_init = rs_rate_init_ops,
4150 .alloc = rs_alloc,
4151 .free = rs_free,
4152 .alloc_sta = rs_drv_alloc_sta,
4153 .free_sta = rs_free_sta,
4154 .rate_update = rs_drv_rate_update,
4155 #ifdef CONFIG_MAC80211_DEBUGFS
4156 .add_sta_debugfs = rs_drv_add_sta_debugfs,
4157 #endif
4158 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4159 };
4160
4161 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4162 enum nl80211_band band, bool update)
4163 {
4164 if (iwl_mvm_has_tlc_offload(mvm)) {
4165 rs_fw_rate_init(mvm, sta, band, update);
4166 } else {
4167 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4168
4169 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock);
4170 rs_drv_rate_init(mvm, sta, band);
4171 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
4172 }
4173 }
4174
4175 int iwl_mvm_rate_control_register(void)
4176 {
4177 return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4178 }
4179
4180 void iwl_mvm_rate_control_unregister(void)
4181 {
4182 ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4183 }
4184
4185 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4186 bool enable)
4187 {
4188 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4189
4190 lockdep_assert_held(&mvm->mutex);
4191
4192 if (enable) {
4193 if (mvmsta->tx_protection == 0)
4194 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4195 mvmsta->tx_protection++;
4196 } else {
4197 mvmsta->tx_protection--;
4198 if (mvmsta->tx_protection == 0)
4199 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4200 }
4201
4202 return iwl_mvm_send_lq_cmd(mvm, lq);
4203 }
4204
4205 /**
4206 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4207 * @mvmsta: The station
4208 * @enable: Enable Tx protection?
4209 */
4210 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4211 bool enable)
4212 {
4213 if (iwl_mvm_has_tlc_offload(mvm))
4214 return rs_fw_tx_protection(mvm, mvmsta, enable);
4215 else
4216 return rs_drv_tx_protection(mvm, mvmsta, enable);
4217 }
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