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