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iwlwifi: mvm: drop low_latency_agg_frame_cnt_limit
[mirror_ubuntu-artful-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 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 *
19 * The full GNU General Public License is included in this distribution in the
20 * file called LICENSE.
21 *
22 * Contact Information:
23 * Intel Linux Wireless <ilw@linux.intel.com>
24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *
26 *****************************************************************************/
27 #include <linux/kernel.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37 #include "rs.h"
38 #include "fw-api.h"
39 #include "sta.h"
40 #include "iwl-op-mode.h"
41 #include "mvm.h"
42 #include "debugfs.h"
43
44 #define RS_NAME "iwl-mvm-rs"
45
46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
47
48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
49 * Use this macro when dealing with thresholds consts set as a percentage
50 */
51 #define RS_PERCENT(x) (128 * x)
52
53 static u8 rs_ht_to_legacy[] = {
54 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
55 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
56 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
57 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
58 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
59 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
60 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
61 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 [ANT_NONE] = ANT_NONE,
68 [ANT_A] = ANT_B,
69 [ANT_B] = ANT_C,
70 [ANT_AB] = ANT_BC,
71 [ANT_C] = ANT_A,
72 [ANT_AC] = ANT_AB,
73 [ANT_BC] = ANT_AC,
74 [ANT_ABC] = ANT_ABC,
75 };
76
77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
83 IWL_RATE_##rp##M_INDEX, \
84 IWL_RATE_##rn##M_INDEX }
85
86 #define IWL_DECLARE_MCS_RATE(s) \
87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_INVM_INDEX, \
93 IWL_RATE_INVM_INDEX }
94
95 /*
96 * Parameter order:
97 * rate, ht rate, prev rate, next rate
98 *
99 * If there isn't a valid next or previous rate then INV is used which
100 * maps to IWL_RATE_INVALID
101 *
102 */
103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
104 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
105 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
106 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
107 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
109 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
119 };
120
121 enum rs_action {
122 RS_ACTION_STAY = 0,
123 RS_ACTION_DOWNSCALE = -1,
124 RS_ACTION_UPSCALE = 1,
125 };
126
127 enum rs_column_mode {
128 RS_INVALID = 0,
129 RS_LEGACY,
130 RS_SISO,
131 RS_MIMO2,
132 };
133
134 #define MAX_NEXT_COLUMNS 7
135 #define MAX_COLUMN_CHECKS 3
136
137 struct rs_tx_column;
138
139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
140 struct ieee80211_sta *sta,
141 struct rs_rate *rate,
142 const struct rs_tx_column *next_col);
143
144 struct rs_tx_column {
145 enum rs_column_mode mode;
146 u8 ant;
147 bool sgi;
148 enum rs_column next_columns[MAX_NEXT_COLUMNS];
149 allow_column_func_t checks[MAX_COLUMN_CHECKS];
150 };
151
152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
153 struct rs_rate *rate,
154 const struct rs_tx_column *next_col)
155 {
156 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
157 }
158
159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
160 struct rs_rate *rate,
161 const struct rs_tx_column *next_col)
162 {
163 struct iwl_mvm_sta *mvmsta;
164 struct iwl_mvm_vif *mvmvif;
165
166 if (!sta->ht_cap.ht_supported)
167 return false;
168
169 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
170 return false;
171
172 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
173 return false;
174
175 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
176 return false;
177
178 mvmsta = iwl_mvm_sta_from_mac80211(sta);
179 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
180
181 if (mvm->nvm_data->sku_cap_mimo_disabled)
182 return false;
183
184 return true;
185 }
186
187 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
188 struct rs_rate *rate,
189 const struct rs_tx_column *next_col)
190 {
191 if (!sta->ht_cap.ht_supported)
192 return false;
193
194 return true;
195 }
196
197 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
198 struct rs_rate *rate,
199 const struct rs_tx_column *next_col)
200 {
201 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
202 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
203
204 if (is_ht20(rate) && (ht_cap->cap &
205 IEEE80211_HT_CAP_SGI_20))
206 return true;
207 if (is_ht40(rate) && (ht_cap->cap &
208 IEEE80211_HT_CAP_SGI_40))
209 return true;
210 if (is_ht80(rate) && (vht_cap->cap &
211 IEEE80211_VHT_CAP_SHORT_GI_80))
212 return true;
213
214 return false;
215 }
216
217 static const struct rs_tx_column rs_tx_columns[] = {
218 [RS_COLUMN_LEGACY_ANT_A] = {
219 .mode = RS_LEGACY,
220 .ant = ANT_A,
221 .next_columns = {
222 RS_COLUMN_LEGACY_ANT_B,
223 RS_COLUMN_SISO_ANT_A,
224 RS_COLUMN_MIMO2,
225 RS_COLUMN_INVALID,
226 RS_COLUMN_INVALID,
227 RS_COLUMN_INVALID,
228 RS_COLUMN_INVALID,
229 },
230 .checks = {
231 rs_ant_allow,
232 },
233 },
234 [RS_COLUMN_LEGACY_ANT_B] = {
235 .mode = RS_LEGACY,
236 .ant = ANT_B,
237 .next_columns = {
238 RS_COLUMN_LEGACY_ANT_A,
239 RS_COLUMN_SISO_ANT_B,
240 RS_COLUMN_MIMO2,
241 RS_COLUMN_INVALID,
242 RS_COLUMN_INVALID,
243 RS_COLUMN_INVALID,
244 RS_COLUMN_INVALID,
245 },
246 .checks = {
247 rs_ant_allow,
248 },
249 },
250 [RS_COLUMN_SISO_ANT_A] = {
251 .mode = RS_SISO,
252 .ant = ANT_A,
253 .next_columns = {
254 RS_COLUMN_SISO_ANT_B,
255 RS_COLUMN_MIMO2,
256 RS_COLUMN_SISO_ANT_A_SGI,
257 RS_COLUMN_LEGACY_ANT_A,
258 RS_COLUMN_LEGACY_ANT_B,
259 RS_COLUMN_INVALID,
260 RS_COLUMN_INVALID,
261 },
262 .checks = {
263 rs_siso_allow,
264 rs_ant_allow,
265 },
266 },
267 [RS_COLUMN_SISO_ANT_B] = {
268 .mode = RS_SISO,
269 .ant = ANT_B,
270 .next_columns = {
271 RS_COLUMN_SISO_ANT_A,
272 RS_COLUMN_MIMO2,
273 RS_COLUMN_SISO_ANT_B_SGI,
274 RS_COLUMN_LEGACY_ANT_A,
275 RS_COLUMN_LEGACY_ANT_B,
276 RS_COLUMN_INVALID,
277 RS_COLUMN_INVALID,
278 },
279 .checks = {
280 rs_siso_allow,
281 rs_ant_allow,
282 },
283 },
284 [RS_COLUMN_SISO_ANT_A_SGI] = {
285 .mode = RS_SISO,
286 .ant = ANT_A,
287 .sgi = true,
288 .next_columns = {
289 RS_COLUMN_SISO_ANT_B_SGI,
290 RS_COLUMN_MIMO2_SGI,
291 RS_COLUMN_SISO_ANT_A,
292 RS_COLUMN_LEGACY_ANT_A,
293 RS_COLUMN_LEGACY_ANT_B,
294 RS_COLUMN_INVALID,
295 RS_COLUMN_INVALID,
296 },
297 .checks = {
298 rs_siso_allow,
299 rs_ant_allow,
300 rs_sgi_allow,
301 },
302 },
303 [RS_COLUMN_SISO_ANT_B_SGI] = {
304 .mode = RS_SISO,
305 .ant = ANT_B,
306 .sgi = true,
307 .next_columns = {
308 RS_COLUMN_SISO_ANT_A_SGI,
309 RS_COLUMN_MIMO2_SGI,
310 RS_COLUMN_SISO_ANT_B,
311 RS_COLUMN_LEGACY_ANT_A,
312 RS_COLUMN_LEGACY_ANT_B,
313 RS_COLUMN_INVALID,
314 RS_COLUMN_INVALID,
315 },
316 .checks = {
317 rs_siso_allow,
318 rs_ant_allow,
319 rs_sgi_allow,
320 },
321 },
322 [RS_COLUMN_MIMO2] = {
323 .mode = RS_MIMO2,
324 .ant = ANT_AB,
325 .next_columns = {
326 RS_COLUMN_SISO_ANT_A,
327 RS_COLUMN_MIMO2_SGI,
328 RS_COLUMN_LEGACY_ANT_A,
329 RS_COLUMN_LEGACY_ANT_B,
330 RS_COLUMN_INVALID,
331 RS_COLUMN_INVALID,
332 RS_COLUMN_INVALID,
333 },
334 .checks = {
335 rs_mimo_allow,
336 },
337 },
338 [RS_COLUMN_MIMO2_SGI] = {
339 .mode = RS_MIMO2,
340 .ant = ANT_AB,
341 .sgi = true,
342 .next_columns = {
343 RS_COLUMN_SISO_ANT_A_SGI,
344 RS_COLUMN_MIMO2,
345 RS_COLUMN_LEGACY_ANT_A,
346 RS_COLUMN_LEGACY_ANT_B,
347 RS_COLUMN_INVALID,
348 RS_COLUMN_INVALID,
349 RS_COLUMN_INVALID,
350 },
351 .checks = {
352 rs_mimo_allow,
353 rs_sgi_allow,
354 },
355 },
356 };
357
358 static inline u8 rs_extract_rate(u32 rate_n_flags)
359 {
360 /* also works for HT because bits 7:6 are zero there */
361 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
362 }
363
364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
365 {
366 int idx = 0;
367
368 if (rate_n_flags & RATE_MCS_HT_MSK) {
369 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
370 idx += IWL_RATE_MCS_0_INDEX;
371
372 /* skip 9M not supported in HT*/
373 if (idx >= IWL_RATE_9M_INDEX)
374 idx += 1;
375 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
376 return idx;
377 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
378 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
379 idx += IWL_RATE_MCS_0_INDEX;
380
381 /* skip 9M not supported in VHT*/
382 if (idx >= IWL_RATE_9M_INDEX)
383 idx++;
384 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
385 return idx;
386 } else {
387 /* legacy rate format, search for match in table */
388
389 u8 legacy_rate = rs_extract_rate(rate_n_flags);
390 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
391 if (iwl_rates[idx].plcp == legacy_rate)
392 return idx;
393 }
394
395 return IWL_RATE_INVALID;
396 }
397
398 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
399 struct ieee80211_sta *sta,
400 struct iwl_lq_sta *lq_sta,
401 int tid);
402 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
403 struct ieee80211_sta *sta,
404 struct iwl_lq_sta *lq_sta,
405 const struct rs_rate *initial_rate);
406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
407
408 /**
409 * The following tables contain the expected throughput metrics for all rates
410 *
411 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
412 *
413 * where invalid entries are zeros.
414 *
415 * CCK rates are only valid in legacy table and will only be used in G
416 * (2.4 GHz) band.
417 */
418
419 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
420 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
421 };
422
423 /* Expected TpT tables. 4 indexes:
424 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
425 */
426 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
427 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
428 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
429 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
430 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
431 };
432
433 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
434 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
435 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
436 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
437 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
438 };
439
440 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
441 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
442 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
443 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
444 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
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 /* mbps, mcs */
469 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
470 { "1", "BPSK DSSS"},
471 { "2", "QPSK DSSS"},
472 {"5.5", "BPSK CCK"},
473 { "11", "QPSK CCK"},
474 { "6", "BPSK 1/2"},
475 { "9", "BPSK 1/2"},
476 { "12", "QPSK 1/2"},
477 { "18", "QPSK 3/4"},
478 { "24", "16QAM 1/2"},
479 { "36", "16QAM 3/4"},
480 { "48", "64QAM 2/3"},
481 { "54", "64QAM 3/4"},
482 { "60", "64QAM 5/6"},
483 };
484
485 #define MCS_INDEX_PER_STREAM (8)
486
487 static const char *rs_pretty_ant(u8 ant)
488 {
489 static const char * const ant_name[] = {
490 [ANT_NONE] = "None",
491 [ANT_A] = "A",
492 [ANT_B] = "B",
493 [ANT_AB] = "AB",
494 [ANT_C] = "C",
495 [ANT_AC] = "AC",
496 [ANT_BC] = "BC",
497 [ANT_ABC] = "ABC",
498 };
499
500 if (ant > ANT_ABC)
501 return "UNKNOWN";
502
503 return ant_name[ant];
504 }
505
506 static const char *rs_pretty_lq_type(enum iwl_table_type type)
507 {
508 static const char * const lq_types[] = {
509 [LQ_NONE] = "NONE",
510 [LQ_LEGACY_A] = "LEGACY_A",
511 [LQ_LEGACY_G] = "LEGACY_G",
512 [LQ_HT_SISO] = "HT SISO",
513 [LQ_HT_MIMO2] = "HT MIMO",
514 [LQ_VHT_SISO] = "VHT SISO",
515 [LQ_VHT_MIMO2] = "VHT MIMO",
516 };
517
518 if (type < LQ_NONE || type >= LQ_MAX)
519 return "UNKNOWN";
520
521 return lq_types[type];
522 }
523
524 static char *rs_pretty_rate(const struct rs_rate *rate)
525 {
526 static char buf[40];
527 static const char * const legacy_rates[] = {
528 [IWL_RATE_1M_INDEX] = "1M",
529 [IWL_RATE_2M_INDEX] = "2M",
530 [IWL_RATE_5M_INDEX] = "5.5M",
531 [IWL_RATE_11M_INDEX] = "11M",
532 [IWL_RATE_6M_INDEX] = "6M",
533 [IWL_RATE_9M_INDEX] = "9M",
534 [IWL_RATE_12M_INDEX] = "12M",
535 [IWL_RATE_18M_INDEX] = "18M",
536 [IWL_RATE_24M_INDEX] = "24M",
537 [IWL_RATE_36M_INDEX] = "36M",
538 [IWL_RATE_48M_INDEX] = "48M",
539 [IWL_RATE_54M_INDEX] = "54M",
540 };
541 static const char *const ht_vht_rates[] = {
542 [IWL_RATE_MCS_0_INDEX] = "MCS0",
543 [IWL_RATE_MCS_1_INDEX] = "MCS1",
544 [IWL_RATE_MCS_2_INDEX] = "MCS2",
545 [IWL_RATE_MCS_3_INDEX] = "MCS3",
546 [IWL_RATE_MCS_4_INDEX] = "MCS4",
547 [IWL_RATE_MCS_5_INDEX] = "MCS5",
548 [IWL_RATE_MCS_6_INDEX] = "MCS6",
549 [IWL_RATE_MCS_7_INDEX] = "MCS7",
550 [IWL_RATE_MCS_8_INDEX] = "MCS8",
551 [IWL_RATE_MCS_9_INDEX] = "MCS9",
552 };
553 const char *rate_str;
554
555 if (is_type_legacy(rate->type))
556 rate_str = legacy_rates[rate->index];
557 else if (is_type_ht(rate->type) || is_type_vht(rate->type))
558 rate_str = ht_vht_rates[rate->index];
559 else
560 rate_str = "BAD_RATE";
561
562 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
563 rs_pretty_ant(rate->ant), rate_str);
564 return buf;
565 }
566
567 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
568 const char *prefix)
569 {
570 IWL_DEBUG_RATE(mvm,
571 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
572 prefix, rs_pretty_rate(rate), rate->bw,
573 rate->sgi, rate->ldpc, rate->stbc);
574 }
575
576 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
577 {
578 window->data = 0;
579 window->success_counter = 0;
580 window->success_ratio = IWL_INVALID_VALUE;
581 window->counter = 0;
582 window->average_tpt = IWL_INVALID_VALUE;
583 }
584
585 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
586 struct iwl_scale_tbl_info *tbl)
587 {
588 int i;
589
590 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
591 for (i = 0; i < IWL_RATE_COUNT; i++)
592 rs_rate_scale_clear_window(&tbl->win[i]);
593
594 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
595 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
596 }
597
598 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
599 {
600 return (ant_type & valid_antenna) == ant_type;
601 }
602
603 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
604 struct iwl_lq_sta *lq_data, u8 tid,
605 struct ieee80211_sta *sta)
606 {
607 int ret = -EAGAIN;
608
609 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
610 sta->addr, tid);
611 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
612 if (ret == -EAGAIN) {
613 /*
614 * driver and mac80211 is out of sync
615 * this might be cause by reloading firmware
616 * stop the tx ba session here
617 */
618 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
619 tid);
620 ieee80211_stop_tx_ba_session(sta, tid);
621 }
622 return ret;
623 }
624
625 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
626 struct iwl_lq_sta *lq_data,
627 struct ieee80211_sta *sta)
628 {
629 if (tid < IWL_MAX_TID_COUNT)
630 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
631 else
632 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
633 tid, IWL_MAX_TID_COUNT);
634 }
635
636 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
637 {
638 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
639 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
640 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
641 }
642
643 /*
644 * Static function to get the expected throughput from an iwl_scale_tbl_info
645 * that wraps a NULL pointer check
646 */
647 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
648 {
649 if (tbl->expected_tpt)
650 return tbl->expected_tpt[rs_index];
651 return 0;
652 }
653
654 /**
655 * rs_collect_tx_data - Update the success/failure sliding window
656 *
657 * We keep a sliding window of the last 62 packets transmitted
658 * at this rate. window->data contains the bitmask of successful
659 * packets.
660 */
661 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
662 struct iwl_scale_tbl_info *tbl,
663 int scale_index, int attempts, int successes,
664 struct iwl_rate_scale_data *window)
665 {
666 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
667 s32 fail_count, tpt;
668
669 /* Get expected throughput */
670 tpt = get_expected_tpt(tbl, scale_index);
671
672 /*
673 * Keep track of only the latest 62 tx frame attempts in this rate's
674 * history window; anything older isn't really relevant any more.
675 * If we have filled up the sliding window, drop the oldest attempt;
676 * if the oldest attempt (highest bit in bitmap) shows "success",
677 * subtract "1" from the success counter (this is the main reason
678 * we keep these bitmaps!).
679 */
680 while (attempts > 0) {
681 if (window->counter >= IWL_RATE_MAX_WINDOW) {
682 /* remove earliest */
683 window->counter = IWL_RATE_MAX_WINDOW - 1;
684
685 if (window->data & mask) {
686 window->data &= ~mask;
687 window->success_counter--;
688 }
689 }
690
691 /* Increment frames-attempted counter */
692 window->counter++;
693
694 /* Shift bitmap by one frame to throw away oldest history */
695 window->data <<= 1;
696
697 /* Mark the most recent #successes attempts as successful */
698 if (successes > 0) {
699 window->success_counter++;
700 window->data |= 0x1;
701 successes--;
702 }
703
704 attempts--;
705 }
706
707 /* Calculate current success ratio, avoid divide-by-0! */
708 if (window->counter > 0)
709 window->success_ratio = 128 * (100 * window->success_counter)
710 / window->counter;
711 else
712 window->success_ratio = IWL_INVALID_VALUE;
713
714 fail_count = window->counter - window->success_counter;
715
716 /* Calculate average throughput, if we have enough history. */
717 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
718 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
719 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
720 else
721 window->average_tpt = IWL_INVALID_VALUE;
722
723 return 0;
724 }
725
726 static int rs_collect_tx_data(struct iwl_mvm *mvm,
727 struct iwl_lq_sta *lq_sta,
728 struct iwl_scale_tbl_info *tbl,
729 int scale_index, int attempts, int successes,
730 u8 reduced_txp)
731 {
732 struct iwl_rate_scale_data *window = NULL;
733 int ret;
734
735 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
736 return -EINVAL;
737
738 if (tbl->column != RS_COLUMN_INVALID) {
739 struct lq_sta_pers *pers = &lq_sta->pers;
740
741 pers->tx_stats[tbl->column][scale_index].total += attempts;
742 pers->tx_stats[tbl->column][scale_index].success += successes;
743 }
744
745 /* Select window for current tx bit rate */
746 window = &(tbl->win[scale_index]);
747
748 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
749 window);
750 if (ret)
751 return ret;
752
753 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
754 return -EINVAL;
755
756 window = &tbl->tpc_win[reduced_txp];
757 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
758 window);
759 }
760
761 /* Convert rs_rate object into ucode rate bitmask */
762 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
763 struct rs_rate *rate)
764 {
765 u32 ucode_rate = 0;
766 int index = rate->index;
767
768 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
769 RATE_MCS_ANT_ABC_MSK);
770
771 if (is_legacy(rate)) {
772 ucode_rate |= iwl_rates[index].plcp;
773 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
774 ucode_rate |= RATE_MCS_CCK_MSK;
775 return ucode_rate;
776 }
777
778 if (is_ht(rate)) {
779 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
780 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
781 index = IWL_LAST_HT_RATE;
782 }
783 ucode_rate |= RATE_MCS_HT_MSK;
784
785 if (is_ht_siso(rate))
786 ucode_rate |= iwl_rates[index].plcp_ht_siso;
787 else if (is_ht_mimo2(rate))
788 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
789 else
790 WARN_ON_ONCE(1);
791 } else if (is_vht(rate)) {
792 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
793 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
794 index = IWL_LAST_VHT_RATE;
795 }
796 ucode_rate |= RATE_MCS_VHT_MSK;
797 if (is_vht_siso(rate))
798 ucode_rate |= iwl_rates[index].plcp_vht_siso;
799 else if (is_vht_mimo2(rate))
800 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
801 else
802 WARN_ON_ONCE(1);
803
804 } else {
805 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
806 }
807
808 if (is_siso(rate) && rate->stbc) {
809 /* To enable STBC we need to set both a flag and ANT_AB */
810 ucode_rate |= RATE_MCS_ANT_AB_MSK;
811 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
812 }
813
814 ucode_rate |= rate->bw;
815 if (rate->sgi)
816 ucode_rate |= RATE_MCS_SGI_MSK;
817 if (rate->ldpc)
818 ucode_rate |= RATE_MCS_LDPC_MSK;
819
820 return ucode_rate;
821 }
822
823 /* Convert a ucode rate into an rs_rate object */
824 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
825 enum ieee80211_band band,
826 struct rs_rate *rate)
827 {
828 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
829 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
830 u8 nss;
831
832 memset(rate, 0, sizeof(*rate));
833 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
834
835 if (rate->index == IWL_RATE_INVALID)
836 return -EINVAL;
837
838 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
839
840 /* Legacy */
841 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
842 !(ucode_rate & RATE_MCS_VHT_MSK)) {
843 if (num_of_ant == 1) {
844 if (band == IEEE80211_BAND_5GHZ)
845 rate->type = LQ_LEGACY_A;
846 else
847 rate->type = LQ_LEGACY_G;
848 }
849
850 return 0;
851 }
852
853 /* HT or VHT */
854 if (ucode_rate & RATE_MCS_SGI_MSK)
855 rate->sgi = true;
856 if (ucode_rate & RATE_MCS_LDPC_MSK)
857 rate->ldpc = true;
858 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
859 rate->stbc = true;
860 if (ucode_rate & RATE_MCS_BF_MSK)
861 rate->bfer = true;
862
863 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
864
865 if (ucode_rate & RATE_MCS_HT_MSK) {
866 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
867 RATE_HT_MCS_NSS_POS) + 1;
868
869 if (nss == 1) {
870 rate->type = LQ_HT_SISO;
871 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
872 "stbc %d bfer %d",
873 rate->stbc, rate->bfer);
874 } else if (nss == 2) {
875 rate->type = LQ_HT_MIMO2;
876 WARN_ON_ONCE(num_of_ant != 2);
877 } else {
878 WARN_ON_ONCE(1);
879 }
880 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
881 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
882 RATE_VHT_MCS_NSS_POS) + 1;
883
884 if (nss == 1) {
885 rate->type = LQ_VHT_SISO;
886 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
887 "stbc %d bfer %d",
888 rate->stbc, rate->bfer);
889 } else if (nss == 2) {
890 rate->type = LQ_VHT_MIMO2;
891 WARN_ON_ONCE(num_of_ant != 2);
892 } else {
893 WARN_ON_ONCE(1);
894 }
895 }
896
897 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
898 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
899 !is_vht(rate));
900
901 return 0;
902 }
903
904 /* switch to another antenna/antennas and return 1 */
905 /* if no other valid antenna found, return 0 */
906 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
907 {
908 u8 new_ant_type;
909
910 if (!rate->ant || rate->ant > ANT_ABC)
911 return 0;
912
913 if (!rs_is_valid_ant(valid_ant, rate->ant))
914 return 0;
915
916 new_ant_type = ant_toggle_lookup[rate->ant];
917
918 while ((new_ant_type != rate->ant) &&
919 !rs_is_valid_ant(valid_ant, new_ant_type))
920 new_ant_type = ant_toggle_lookup[new_ant_type];
921
922 if (new_ant_type == rate->ant)
923 return 0;
924
925 rate->ant = new_ant_type;
926
927 return 1;
928 }
929
930 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
931 struct rs_rate *rate)
932 {
933 if (is_legacy(rate))
934 return lq_sta->active_legacy_rate;
935 else if (is_siso(rate))
936 return lq_sta->active_siso_rate;
937 else if (is_mimo2(rate))
938 return lq_sta->active_mimo2_rate;
939
940 WARN_ON_ONCE(1);
941 return 0;
942 }
943
944 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
945 int rate_type)
946 {
947 u8 high = IWL_RATE_INVALID;
948 u8 low = IWL_RATE_INVALID;
949
950 /* 802.11A or ht walks to the next literal adjacent rate in
951 * the rate table */
952 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
953 int i;
954 u32 mask;
955
956 /* Find the previous rate that is in the rate mask */
957 i = index - 1;
958 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
959 if (rate_mask & mask) {
960 low = i;
961 break;
962 }
963 }
964
965 /* Find the next rate that is in the rate mask */
966 i = index + 1;
967 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
968 if (rate_mask & mask) {
969 high = i;
970 break;
971 }
972 }
973
974 return (high << 8) | low;
975 }
976
977 low = index;
978 while (low != IWL_RATE_INVALID) {
979 low = iwl_rates[low].prev_rs;
980 if (low == IWL_RATE_INVALID)
981 break;
982 if (rate_mask & (1 << low))
983 break;
984 }
985
986 high = index;
987 while (high != IWL_RATE_INVALID) {
988 high = iwl_rates[high].next_rs;
989 if (high == IWL_RATE_INVALID)
990 break;
991 if (rate_mask & (1 << high))
992 break;
993 }
994
995 return (high << 8) | low;
996 }
997
998 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
999 struct rs_rate *rate)
1000 {
1001 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1002 }
1003
1004 /* Get the next supported lower rate in the current column.
1005 * Return true if bottom rate in the current column was reached
1006 */
1007 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1008 struct rs_rate *rate)
1009 {
1010 u8 low;
1011 u16 high_low;
1012 u16 rate_mask;
1013 struct iwl_mvm *mvm = lq_sta->pers.drv;
1014
1015 rate_mask = rs_get_supported_rates(lq_sta, rate);
1016 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1017 rate->type);
1018 low = high_low & 0xff;
1019
1020 /* Bottom rate of column reached */
1021 if (low == IWL_RATE_INVALID)
1022 return true;
1023
1024 rate->index = low;
1025 return false;
1026 }
1027
1028 /* Get the next rate to use following a column downgrade */
1029 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1030 struct rs_rate *rate)
1031 {
1032 struct iwl_mvm *mvm = lq_sta->pers.drv;
1033
1034 if (is_legacy(rate)) {
1035 /* No column to downgrade from Legacy */
1036 return;
1037 } else if (is_siso(rate)) {
1038 /* Downgrade to Legacy if we were in SISO */
1039 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1040 rate->type = LQ_LEGACY_A;
1041 else
1042 rate->type = LQ_LEGACY_G;
1043
1044 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1045
1046 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1047 rate->index > IWL_RATE_MCS_9_INDEX);
1048
1049 rate->index = rs_ht_to_legacy[rate->index];
1050 rate->ldpc = false;
1051 } else {
1052 /* Downgrade to SISO with same MCS if in MIMO */
1053 rate->type = is_vht_mimo2(rate) ?
1054 LQ_VHT_SISO : LQ_HT_SISO;
1055 }
1056
1057 if (num_of_ant(rate->ant) > 1)
1058 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1059
1060 /* Relevant in both switching to SISO or Legacy */
1061 rate->sgi = false;
1062
1063 if (!rs_rate_supported(lq_sta, rate))
1064 rs_get_lower_rate_in_column(lq_sta, rate);
1065 }
1066
1067 /* Check if both rates are identical
1068 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1069 * with a rate indicating STBC/BFER and ANT_AB.
1070 */
1071 static inline bool rs_rate_equal(struct rs_rate *a,
1072 struct rs_rate *b,
1073 bool allow_ant_mismatch)
1074
1075 {
1076 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1077 (a->bfer == b->bfer);
1078
1079 if (allow_ant_mismatch) {
1080 if (a->stbc || a->bfer) {
1081 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1082 a->stbc, a->bfer, a->ant);
1083 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1084 } else if (b->stbc || b->bfer) {
1085 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1086 b->stbc, b->bfer, b->ant);
1087 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1088 }
1089 }
1090
1091 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1092 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1093 }
1094
1095 /* Check if both rates share the same column */
1096 static inline bool rs_rate_column_match(struct rs_rate *a,
1097 struct rs_rate *b)
1098 {
1099 bool ant_match;
1100
1101 if (a->stbc || a->bfer)
1102 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1103 else
1104 ant_match = (a->ant == b->ant);
1105
1106 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1107 && ant_match;
1108 }
1109
1110 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1111 {
1112 if (is_legacy(rate)) {
1113 if (rate->ant == ANT_A)
1114 return RS_COLUMN_LEGACY_ANT_A;
1115
1116 if (rate->ant == ANT_B)
1117 return RS_COLUMN_LEGACY_ANT_B;
1118
1119 goto err;
1120 }
1121
1122 if (is_siso(rate)) {
1123 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1124 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1125 RS_COLUMN_SISO_ANT_A;
1126
1127 if (rate->ant == ANT_B)
1128 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1129 RS_COLUMN_SISO_ANT_B;
1130
1131 goto err;
1132 }
1133
1134 if (is_mimo(rate))
1135 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1136
1137 err:
1138 return RS_COLUMN_INVALID;
1139 }
1140
1141 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1142 {
1143 u8 tid = IWL_MAX_TID_COUNT;
1144
1145 if (ieee80211_is_data_qos(hdr->frame_control)) {
1146 u8 *qc = ieee80211_get_qos_ctl(hdr);
1147 tid = qc[0] & 0xf;
1148 }
1149
1150 if (unlikely(tid > IWL_MAX_TID_COUNT))
1151 tid = IWL_MAX_TID_COUNT;
1152
1153 return tid;
1154 }
1155
1156 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1157 int tid, struct ieee80211_tx_info *info)
1158 {
1159 int legacy_success;
1160 int retries;
1161 int i;
1162 struct iwl_lq_cmd *table;
1163 u32 lq_hwrate;
1164 struct rs_rate lq_rate, tx_resp_rate;
1165 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1166 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1167 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1168 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1169 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1170 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1171 IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1172
1173 /* Treat uninitialized rate scaling data same as non-existing. */
1174 if (!lq_sta) {
1175 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1176 return;
1177 } else if (!lq_sta->pers.drv) {
1178 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1179 return;
1180 }
1181
1182 /* This packet was aggregated but doesn't carry status info */
1183 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1184 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1185 return;
1186
1187 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1188
1189 #ifdef CONFIG_MAC80211_DEBUGFS
1190 /* Disable last tx check if we are debugging with fixed rate but
1191 * update tx stats */
1192 if (lq_sta->pers.dbg_fixed_rate) {
1193 int index = tx_resp_rate.index;
1194 enum rs_column column;
1195 int attempts, success;
1196
1197 column = rs_get_column_from_rate(&tx_resp_rate);
1198 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1199 "Can't map rate 0x%x to column",
1200 tx_resp_hwrate))
1201 return;
1202
1203 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1204 attempts = info->status.ampdu_len;
1205 success = info->status.ampdu_ack_len;
1206 } else {
1207 attempts = info->status.rates[0].count;
1208 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1209 }
1210
1211 lq_sta->pers.tx_stats[column][index].total += attempts;
1212 lq_sta->pers.tx_stats[column][index].success += success;
1213
1214 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1215 tx_resp_hwrate, success, attempts);
1216 return;
1217 }
1218 #endif
1219
1220 if (time_after(jiffies,
1221 (unsigned long)(lq_sta->last_tx +
1222 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1223 int t;
1224
1225 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1226 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1227 ieee80211_stop_tx_ba_session(sta, t);
1228
1229 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1230 return;
1231 }
1232 lq_sta->last_tx = jiffies;
1233
1234 /* Ignore this Tx frame response if its initial rate doesn't match
1235 * that of latest Link Quality command. There may be stragglers
1236 * from a previous Link Quality command, but we're no longer interested
1237 * in those; they're either from the "active" mode while we're trying
1238 * to check "search" mode, or a prior "search" mode after we've moved
1239 * to a new "search" mode (which might become the new "active" mode).
1240 */
1241 table = &lq_sta->lq;
1242 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1243 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1244
1245 /* Here we actually compare this rate to the latest LQ command */
1246 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1247 IWL_DEBUG_RATE(mvm,
1248 "initial tx resp rate 0x%x does not match 0x%x\n",
1249 tx_resp_hwrate, lq_hwrate);
1250
1251 /*
1252 * Since rates mis-match, the last LQ command may have failed.
1253 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1254 * ... driver.
1255 */
1256 lq_sta->missed_rate_counter++;
1257 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1258 lq_sta->missed_rate_counter = 0;
1259 IWL_DEBUG_RATE(mvm,
1260 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1261 lq_sta->rs_state);
1262 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1263 }
1264 /* Regardless, ignore this status info for outdated rate */
1265 return;
1266 } else
1267 /* Rate did match, so reset the missed_rate_counter */
1268 lq_sta->missed_rate_counter = 0;
1269
1270 if (!lq_sta->search_better_tbl) {
1271 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1272 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1273 } else {
1274 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1275 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1276 }
1277
1278 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1279 IWL_DEBUG_RATE(mvm,
1280 "Neither active nor search matches tx rate\n");
1281 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1282 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1283 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1284 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1285 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1286
1287 /*
1288 * no matching table found, let's by-pass the data collection
1289 * and continue to perform rate scale to find the rate table
1290 */
1291 rs_stay_in_table(lq_sta, true);
1292 goto done;
1293 }
1294
1295 /*
1296 * Updating the frame history depends on whether packets were
1297 * aggregated.
1298 *
1299 * For aggregation, all packets were transmitted at the same rate, the
1300 * first index into rate scale table.
1301 */
1302 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1303 /* ampdu_ack_len = 0 marks no BA was received. In this case
1304 * treat it as a single frame loss as we don't want the success
1305 * ratio to dip too quickly because a BA wasn't received
1306 */
1307 if (info->status.ampdu_ack_len == 0)
1308 info->status.ampdu_len = 1;
1309
1310 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1311 info->status.ampdu_len,
1312 info->status.ampdu_ack_len,
1313 reduced_txp);
1314
1315 /* Update success/fail counts if not searching for new mode */
1316 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1317 lq_sta->total_success += info->status.ampdu_ack_len;
1318 lq_sta->total_failed += (info->status.ampdu_len -
1319 info->status.ampdu_ack_len);
1320 }
1321 } else {
1322 /* For legacy, update frame history with for each Tx retry. */
1323 retries = info->status.rates[0].count - 1;
1324 /* HW doesn't send more than 15 retries */
1325 retries = min(retries, 15);
1326
1327 /* The last transmission may have been successful */
1328 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1329 /* Collect data for each rate used during failed TX attempts */
1330 for (i = 0; i <= retries; ++i) {
1331 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1332 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1333 &lq_rate);
1334 /*
1335 * Only collect stats if retried rate is in the same RS
1336 * table as active/search.
1337 */
1338 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1339 tmp_tbl = curr_tbl;
1340 else if (rs_rate_column_match(&lq_rate,
1341 &other_tbl->rate))
1342 tmp_tbl = other_tbl;
1343 else
1344 continue;
1345
1346 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1347 1, i < retries ? 0 : legacy_success,
1348 reduced_txp);
1349 }
1350
1351 /* Update success/fail counts if not searching for new mode */
1352 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1353 lq_sta->total_success += legacy_success;
1354 lq_sta->total_failed += retries + (1 - legacy_success);
1355 }
1356 }
1357 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1358 lq_sta->last_rate_n_flags = lq_hwrate;
1359 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1360 done:
1361 /* See if there's a better rate or modulation mode to try. */
1362 if (sta->supp_rates[info->band])
1363 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1364 }
1365
1366 /*
1367 * mac80211 sends us Tx status
1368 */
1369 static void rs_mac80211_tx_status(void *mvm_r,
1370 struct ieee80211_supported_band *sband,
1371 struct ieee80211_sta *sta, void *priv_sta,
1372 struct sk_buff *skb)
1373 {
1374 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1375 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1376 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1377 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1378
1379 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1380 return;
1381
1382 if (!ieee80211_is_data(hdr->frame_control) ||
1383 info->flags & IEEE80211_TX_CTL_NO_ACK)
1384 return;
1385
1386 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1387 }
1388
1389 /*
1390 * Begin a period of staying with a selected modulation mode.
1391 * Set "stay_in_tbl" flag to prevent any mode switches.
1392 * Set frame tx success limits according to legacy vs. high-throughput,
1393 * and reset overall (spanning all rates) tx success history statistics.
1394 * These control how long we stay using same modulation mode before
1395 * searching for a new mode.
1396 */
1397 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1398 struct iwl_lq_sta *lq_sta)
1399 {
1400 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1401 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1402 if (is_legacy) {
1403 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1404 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1405 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1406 } else {
1407 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1408 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1409 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1410 }
1411 lq_sta->table_count = 0;
1412 lq_sta->total_failed = 0;
1413 lq_sta->total_success = 0;
1414 lq_sta->flush_timer = jiffies;
1415 lq_sta->visited_columns = 0;
1416 }
1417
1418 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1419 {
1420 if (rate_mask)
1421 return find_last_bit(&rate_mask, BITS_PER_LONG);
1422 return IWL_RATE_INVALID;
1423 }
1424
1425 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1426 const struct rs_tx_column *column)
1427 {
1428 switch (column->mode) {
1429 case RS_LEGACY:
1430 return lq_sta->max_legacy_rate_idx;
1431 case RS_SISO:
1432 return lq_sta->max_siso_rate_idx;
1433 case RS_MIMO2:
1434 return lq_sta->max_mimo2_rate_idx;
1435 default:
1436 WARN_ON_ONCE(1);
1437 }
1438
1439 return lq_sta->max_legacy_rate_idx;
1440 }
1441
1442 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1443 const struct rs_tx_column *column,
1444 u32 bw)
1445 {
1446 /* Used to choose among HT tables */
1447 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1448
1449 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1450 column->mode != RS_SISO &&
1451 column->mode != RS_MIMO2))
1452 return expected_tpt_legacy;
1453
1454 /* Legacy rates have only one table */
1455 if (column->mode == RS_LEGACY)
1456 return expected_tpt_legacy;
1457
1458 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1459 /* Choose among many HT tables depending on number of streams
1460 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1461 * status */
1462 if (column->mode == RS_SISO) {
1463 switch (bw) {
1464 case RATE_MCS_CHAN_WIDTH_20:
1465 ht_tbl_pointer = expected_tpt_siso_20MHz;
1466 break;
1467 case RATE_MCS_CHAN_WIDTH_40:
1468 ht_tbl_pointer = expected_tpt_siso_40MHz;
1469 break;
1470 case RATE_MCS_CHAN_WIDTH_80:
1471 ht_tbl_pointer = expected_tpt_siso_80MHz;
1472 break;
1473 default:
1474 WARN_ON_ONCE(1);
1475 }
1476 } else if (column->mode == RS_MIMO2) {
1477 switch (bw) {
1478 case RATE_MCS_CHAN_WIDTH_20:
1479 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1480 break;
1481 case RATE_MCS_CHAN_WIDTH_40:
1482 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1483 break;
1484 case RATE_MCS_CHAN_WIDTH_80:
1485 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1486 break;
1487 default:
1488 WARN_ON_ONCE(1);
1489 }
1490 } else {
1491 WARN_ON_ONCE(1);
1492 }
1493
1494 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1495 return ht_tbl_pointer[0];
1496 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1497 return ht_tbl_pointer[1];
1498 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1499 return ht_tbl_pointer[2];
1500 else /* AGG+SGI */
1501 return ht_tbl_pointer[3];
1502 }
1503
1504 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1505 struct iwl_scale_tbl_info *tbl)
1506 {
1507 struct rs_rate *rate = &tbl->rate;
1508 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1509
1510 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1511 }
1512
1513 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1514 struct iwl_lq_sta *lq_sta,
1515 struct iwl_scale_tbl_info *tbl, /* "search" */
1516 unsigned long rate_mask, s8 index)
1517 {
1518 struct iwl_scale_tbl_info *active_tbl =
1519 &(lq_sta->lq_info[lq_sta->active_tbl]);
1520 s32 success_ratio = active_tbl->win[index].success_ratio;
1521 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1522 const u16 *tpt_tbl = tbl->expected_tpt;
1523 u16 high_low;
1524 u32 target_tpt;
1525 int rate_idx;
1526
1527 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1528 target_tpt = 100 * expected_current_tpt;
1529 IWL_DEBUG_RATE(mvm,
1530 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1531 success_ratio, target_tpt);
1532 } else {
1533 target_tpt = lq_sta->last_tpt;
1534 IWL_DEBUG_RATE(mvm,
1535 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1536 success_ratio, target_tpt);
1537 }
1538
1539 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1540
1541 while (rate_idx != IWL_RATE_INVALID) {
1542 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1543 break;
1544
1545 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1546 tbl->rate.type);
1547
1548 rate_idx = (high_low >> 8) & 0xff;
1549 }
1550
1551 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1552 rate_idx, target_tpt,
1553 rate_idx != IWL_RATE_INVALID ?
1554 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1555
1556 return rate_idx;
1557 }
1558
1559 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1560 {
1561 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1562 return RATE_MCS_CHAN_WIDTH_80;
1563 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1564 return RATE_MCS_CHAN_WIDTH_40;
1565
1566 return RATE_MCS_CHAN_WIDTH_20;
1567 }
1568
1569 /*
1570 * Check whether we should continue using same modulation mode, or
1571 * begin search for a new mode, based on:
1572 * 1) # tx successes or failures while using this mode
1573 * 2) # times calling this function
1574 * 3) elapsed time in this mode (not used, for now)
1575 */
1576 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1577 {
1578 struct iwl_scale_tbl_info *tbl;
1579 int active_tbl;
1580 int flush_interval_passed = 0;
1581 struct iwl_mvm *mvm;
1582
1583 mvm = lq_sta->pers.drv;
1584 active_tbl = lq_sta->active_tbl;
1585
1586 tbl = &(lq_sta->lq_info[active_tbl]);
1587
1588 /* If we've been disallowing search, see if we should now allow it */
1589 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1590 /* Elapsed time using current modulation mode */
1591 if (lq_sta->flush_timer)
1592 flush_interval_passed =
1593 time_after(jiffies,
1594 (unsigned long)(lq_sta->flush_timer +
1595 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1596
1597 /*
1598 * Check if we should allow search for new modulation mode.
1599 * If many frames have failed or succeeded, or we've used
1600 * this same modulation for a long time, allow search, and
1601 * reset history stats that keep track of whether we should
1602 * allow a new search. Also (below) reset all bitmaps and
1603 * stats in active history.
1604 */
1605 if (force_search ||
1606 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1607 (lq_sta->total_success > lq_sta->max_success_limit) ||
1608 ((!lq_sta->search_better_tbl) &&
1609 (lq_sta->flush_timer) && (flush_interval_passed))) {
1610 IWL_DEBUG_RATE(mvm,
1611 "LQ: stay is expired %d %d %d\n",
1612 lq_sta->total_failed,
1613 lq_sta->total_success,
1614 flush_interval_passed);
1615
1616 /* Allow search for new mode */
1617 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1618 IWL_DEBUG_RATE(mvm,
1619 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1620 lq_sta->total_failed = 0;
1621 lq_sta->total_success = 0;
1622 lq_sta->flush_timer = 0;
1623 /* mark the current column as visited */
1624 lq_sta->visited_columns = BIT(tbl->column);
1625 /*
1626 * Else if we've used this modulation mode enough repetitions
1627 * (regardless of elapsed time or success/failure), reset
1628 * history bitmaps and rate-specific stats for all rates in
1629 * active table.
1630 */
1631 } else {
1632 lq_sta->table_count++;
1633 if (lq_sta->table_count >=
1634 lq_sta->table_count_limit) {
1635 lq_sta->table_count = 0;
1636
1637 IWL_DEBUG_RATE(mvm,
1638 "LQ: stay in table clear win\n");
1639 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1640 }
1641 }
1642
1643 /* If transitioning to allow "search", reset all history
1644 * bitmaps and stats in active table (this will become the new
1645 * "search" table). */
1646 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1647 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1648 }
1649 }
1650 }
1651
1652 /*
1653 * setup rate table in uCode
1654 */
1655 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1656 struct ieee80211_sta *sta,
1657 struct iwl_lq_sta *lq_sta,
1658 struct iwl_scale_tbl_info *tbl)
1659 {
1660 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1661 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1662 }
1663
1664 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1665 struct ieee80211_sta *sta,
1666 struct iwl_lq_sta *lq_sta,
1667 struct iwl_scale_tbl_info *tbl,
1668 enum rs_action scale_action)
1669 {
1670 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1671 return false;
1672
1673 if (!is_vht_siso(&tbl->rate))
1674 return false;
1675
1676 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1677 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1678 (scale_action == RS_ACTION_DOWNSCALE)) {
1679 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1680 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1681 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1682 goto tweaked;
1683 }
1684
1685 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1686 * sustainable, i.e. we're past the test window. We can't go back
1687 * if MCS5 is just tested as this will happen always after switching
1688 * to 20Mhz MCS4 because the rate stats are cleared.
1689 */
1690 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1691 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1692 (scale_action == RS_ACTION_STAY)) ||
1693 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1694 (scale_action == RS_ACTION_UPSCALE)))) {
1695 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1696 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1697 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1698 goto tweaked;
1699 }
1700
1701 return false;
1702
1703 tweaked:
1704 rs_set_expected_tpt_table(lq_sta, tbl);
1705 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1706 return true;
1707 }
1708
1709 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1710 struct iwl_lq_sta *lq_sta,
1711 struct ieee80211_sta *sta,
1712 struct iwl_scale_tbl_info *tbl)
1713 {
1714 int i, j, max_rate;
1715 enum rs_column next_col_id;
1716 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1717 const struct rs_tx_column *next_col;
1718 allow_column_func_t allow_func;
1719 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1720 const u16 *expected_tpt_tbl;
1721 u16 tpt, max_expected_tpt;
1722
1723 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1724 next_col_id = curr_col->next_columns[i];
1725
1726 if (next_col_id == RS_COLUMN_INVALID)
1727 continue;
1728
1729 if (lq_sta->visited_columns & BIT(next_col_id)) {
1730 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1731 next_col_id);
1732 continue;
1733 }
1734
1735 next_col = &rs_tx_columns[next_col_id];
1736
1737 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1738 IWL_DEBUG_RATE(mvm,
1739 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1740 next_col_id, valid_ants, next_col->ant);
1741 continue;
1742 }
1743
1744 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1745 allow_func = next_col->checks[j];
1746 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1747 next_col))
1748 break;
1749 }
1750
1751 if (j != MAX_COLUMN_CHECKS) {
1752 IWL_DEBUG_RATE(mvm,
1753 "Skip column %d: not allowed (check %d failed)\n",
1754 next_col_id, j);
1755
1756 continue;
1757 }
1758
1759 tpt = lq_sta->last_tpt / 100;
1760 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1761 rs_bw_from_sta_bw(sta));
1762 if (WARN_ON_ONCE(!expected_tpt_tbl))
1763 continue;
1764
1765 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1766 if (max_rate == IWL_RATE_INVALID) {
1767 IWL_DEBUG_RATE(mvm,
1768 "Skip column %d: no rate is allowed in this column\n",
1769 next_col_id);
1770 continue;
1771 }
1772
1773 max_expected_tpt = expected_tpt_tbl[max_rate];
1774 if (tpt >= max_expected_tpt) {
1775 IWL_DEBUG_RATE(mvm,
1776 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1777 next_col_id, max_expected_tpt, tpt);
1778 continue;
1779 }
1780
1781 IWL_DEBUG_RATE(mvm,
1782 "Found potential column %d. Max expected %d current %d\n",
1783 next_col_id, max_expected_tpt, tpt);
1784 break;
1785 }
1786
1787 if (i == MAX_NEXT_COLUMNS)
1788 return RS_COLUMN_INVALID;
1789
1790 return next_col_id;
1791 }
1792
1793 static int rs_switch_to_column(struct iwl_mvm *mvm,
1794 struct iwl_lq_sta *lq_sta,
1795 struct ieee80211_sta *sta,
1796 enum rs_column col_id)
1797 {
1798 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1799 struct iwl_scale_tbl_info *search_tbl =
1800 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1801 struct rs_rate *rate = &search_tbl->rate;
1802 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1803 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1804 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1805 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1806 unsigned long rate_mask = 0;
1807 u32 rate_idx = 0;
1808
1809 memcpy(search_tbl, tbl, sz);
1810
1811 rate->sgi = column->sgi;
1812 rate->ant = column->ant;
1813
1814 if (column->mode == RS_LEGACY) {
1815 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1816 rate->type = LQ_LEGACY_A;
1817 else
1818 rate->type = LQ_LEGACY_G;
1819
1820 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1821 rate->ldpc = false;
1822 rate_mask = lq_sta->active_legacy_rate;
1823 } else if (column->mode == RS_SISO) {
1824 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1825 rate_mask = lq_sta->active_siso_rate;
1826 } else if (column->mode == RS_MIMO2) {
1827 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1828 rate_mask = lq_sta->active_mimo2_rate;
1829 } else {
1830 WARN_ON_ONCE("Bad column mode");
1831 }
1832
1833 if (column->mode != RS_LEGACY) {
1834 rate->bw = rs_bw_from_sta_bw(sta);
1835 rate->ldpc = lq_sta->ldpc;
1836 }
1837
1838 search_tbl->column = col_id;
1839 rs_set_expected_tpt_table(lq_sta, search_tbl);
1840
1841 lq_sta->visited_columns |= BIT(col_id);
1842
1843 /* Get the best matching rate if we're changing modes. e.g.
1844 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1845 */
1846 if (curr_column->mode != column->mode) {
1847 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1848 rate_mask, rate->index);
1849
1850 if ((rate_idx == IWL_RATE_INVALID) ||
1851 !(BIT(rate_idx) & rate_mask)) {
1852 IWL_DEBUG_RATE(mvm,
1853 "can not switch with index %d"
1854 " rate mask %lx\n",
1855 rate_idx, rate_mask);
1856
1857 goto err;
1858 }
1859
1860 rate->index = rate_idx;
1861 }
1862
1863 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1864 col_id, rate->index);
1865
1866 return 0;
1867
1868 err:
1869 rate->type = LQ_NONE;
1870 return -1;
1871 }
1872
1873 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1874 struct iwl_scale_tbl_info *tbl,
1875 s32 sr, int low, int high,
1876 int current_tpt,
1877 int low_tpt, int high_tpt)
1878 {
1879 enum rs_action action = RS_ACTION_STAY;
1880
1881 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1882 (current_tpt == 0)) {
1883 IWL_DEBUG_RATE(mvm,
1884 "Decrease rate because of low SR\n");
1885 return RS_ACTION_DOWNSCALE;
1886 }
1887
1888 if ((low_tpt == IWL_INVALID_VALUE) &&
1889 (high_tpt == IWL_INVALID_VALUE) &&
1890 (high != IWL_RATE_INVALID)) {
1891 IWL_DEBUG_RATE(mvm,
1892 "No data about high/low rates. Increase rate\n");
1893 return RS_ACTION_UPSCALE;
1894 }
1895
1896 if ((high_tpt == IWL_INVALID_VALUE) &&
1897 (high != IWL_RATE_INVALID) &&
1898 (low_tpt != IWL_INVALID_VALUE) &&
1899 (low_tpt < current_tpt)) {
1900 IWL_DEBUG_RATE(mvm,
1901 "No data about high rate and low rate is worse. Increase rate\n");
1902 return RS_ACTION_UPSCALE;
1903 }
1904
1905 if ((high_tpt != IWL_INVALID_VALUE) &&
1906 (high_tpt > current_tpt)) {
1907 IWL_DEBUG_RATE(mvm,
1908 "Higher rate is better. Increate rate\n");
1909 return RS_ACTION_UPSCALE;
1910 }
1911
1912 if ((low_tpt != IWL_INVALID_VALUE) &&
1913 (high_tpt != IWL_INVALID_VALUE) &&
1914 (low_tpt < current_tpt) &&
1915 (high_tpt < current_tpt)) {
1916 IWL_DEBUG_RATE(mvm,
1917 "Both high and low are worse. Maintain rate\n");
1918 return RS_ACTION_STAY;
1919 }
1920
1921 if ((low_tpt != IWL_INVALID_VALUE) &&
1922 (low_tpt > current_tpt)) {
1923 IWL_DEBUG_RATE(mvm,
1924 "Lower rate is better\n");
1925 action = RS_ACTION_DOWNSCALE;
1926 goto out;
1927 }
1928
1929 if ((low_tpt == IWL_INVALID_VALUE) &&
1930 (low != IWL_RATE_INVALID)) {
1931 IWL_DEBUG_RATE(mvm,
1932 "No data about lower rate\n");
1933 action = RS_ACTION_DOWNSCALE;
1934 goto out;
1935 }
1936
1937 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1938
1939 out:
1940 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1941 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1942 IWL_DEBUG_RATE(mvm,
1943 "SR is above NO DECREASE. Avoid downscale\n");
1944 action = RS_ACTION_STAY;
1945 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1946 IWL_DEBUG_RATE(mvm,
1947 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1948 action = RS_ACTION_STAY;
1949 } else {
1950 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1951 }
1952 }
1953
1954 return action;
1955 }
1956
1957 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1958 struct iwl_lq_sta *lq_sta)
1959 {
1960 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1961 * supports STBC of at least 1*SS
1962 */
1963 if (!lq_sta->stbc_capable)
1964 return false;
1965
1966 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1967 return false;
1968
1969 return true;
1970 }
1971
1972 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1973 int *weaker, int *stronger)
1974 {
1975 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1976 if (*weaker > TPC_MAX_REDUCTION)
1977 *weaker = TPC_INVALID;
1978
1979 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1980 if (*stronger < 0)
1981 *stronger = TPC_INVALID;
1982 }
1983
1984 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1985 struct rs_rate *rate, enum ieee80211_band band)
1986 {
1987 int index = rate->index;
1988 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1989 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1990 !vif->bss_conf.ps);
1991
1992 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1993 cam, sta_ps_disabled);
1994 /*
1995 * allow tpc only if power management is enabled, or bt coex
1996 * activity grade allows it and we are on 2.4Ghz.
1997 */
1998 if ((cam || sta_ps_disabled) &&
1999 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2000 return false;
2001
2002 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2003 if (is_legacy(rate))
2004 return index == IWL_RATE_54M_INDEX;
2005 if (is_ht(rate))
2006 return index == IWL_RATE_MCS_7_INDEX;
2007 if (is_vht(rate))
2008 return index == IWL_RATE_MCS_7_INDEX ||
2009 index == IWL_RATE_MCS_8_INDEX ||
2010 index == IWL_RATE_MCS_9_INDEX;
2011
2012 WARN_ON_ONCE(1);
2013 return false;
2014 }
2015
2016 enum tpc_action {
2017 TPC_ACTION_STAY,
2018 TPC_ACTION_DECREASE,
2019 TPC_ACTION_INCREASE,
2020 TPC_ACTION_NO_RESTIRCTION,
2021 };
2022
2023 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2024 s32 sr, int weak, int strong,
2025 int current_tpt,
2026 int weak_tpt, int strong_tpt)
2027 {
2028 /* stay until we have valid tpt */
2029 if (current_tpt == IWL_INVALID_VALUE) {
2030 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2031 return TPC_ACTION_STAY;
2032 }
2033
2034 /* Too many failures, increase txp */
2035 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2036 current_tpt == 0) {
2037 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2038 return TPC_ACTION_NO_RESTIRCTION;
2039 }
2040
2041 /* try decreasing first if applicable */
2042 if (weak != TPC_INVALID) {
2043 if (weak_tpt == IWL_INVALID_VALUE &&
2044 (strong_tpt == IWL_INVALID_VALUE ||
2045 current_tpt >= strong_tpt)) {
2046 IWL_DEBUG_RATE(mvm,
2047 "no weak txp measurement. decrease txp\n");
2048 return TPC_ACTION_DECREASE;
2049 }
2050
2051 if (weak_tpt > current_tpt) {
2052 IWL_DEBUG_RATE(mvm,
2053 "lower txp has better tpt. decrease txp\n");
2054 return TPC_ACTION_DECREASE;
2055 }
2056 }
2057
2058 /* next, increase if needed */
2059 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2060 strong != TPC_INVALID) {
2061 if (weak_tpt == IWL_INVALID_VALUE &&
2062 strong_tpt != IWL_INVALID_VALUE &&
2063 current_tpt < strong_tpt) {
2064 IWL_DEBUG_RATE(mvm,
2065 "higher txp has better tpt. increase txp\n");
2066 return TPC_ACTION_INCREASE;
2067 }
2068
2069 if (weak_tpt < current_tpt &&
2070 (strong_tpt == IWL_INVALID_VALUE ||
2071 strong_tpt > current_tpt)) {
2072 IWL_DEBUG_RATE(mvm,
2073 "lower txp has worse tpt. increase txp\n");
2074 return TPC_ACTION_INCREASE;
2075 }
2076 }
2077
2078 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2079 return TPC_ACTION_STAY;
2080 }
2081
2082 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2083 struct ieee80211_sta *sta,
2084 struct iwl_lq_sta *lq_sta,
2085 struct iwl_scale_tbl_info *tbl)
2086 {
2087 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2088 struct ieee80211_vif *vif = mvm_sta->vif;
2089 struct ieee80211_chanctx_conf *chanctx_conf;
2090 enum ieee80211_band band;
2091 struct iwl_rate_scale_data *window;
2092 struct rs_rate *rate = &tbl->rate;
2093 enum tpc_action action;
2094 s32 sr;
2095 u8 cur = lq_sta->lq.reduced_tpc;
2096 int current_tpt;
2097 int weak, strong;
2098 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2099
2100 #ifdef CONFIG_MAC80211_DEBUGFS
2101 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2102 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2103 lq_sta->pers.dbg_fixed_txp_reduction);
2104 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2105 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2106 }
2107 #endif
2108
2109 rcu_read_lock();
2110 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2111 if (WARN_ON(!chanctx_conf))
2112 band = IEEE80211_NUM_BANDS;
2113 else
2114 band = chanctx_conf->def.chan->band;
2115 rcu_read_unlock();
2116
2117 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2118 IWL_DEBUG_RATE(mvm,
2119 "tpc is not allowed. remove txp restrictions\n");
2120 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2121 return cur != TPC_NO_REDUCTION;
2122 }
2123
2124 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2125
2126 /* Collect measured throughputs for current and adjacent rates */
2127 window = tbl->tpc_win;
2128 sr = window[cur].success_ratio;
2129 current_tpt = window[cur].average_tpt;
2130 if (weak != TPC_INVALID)
2131 weak_tpt = window[weak].average_tpt;
2132 if (strong != TPC_INVALID)
2133 strong_tpt = window[strong].average_tpt;
2134
2135 IWL_DEBUG_RATE(mvm,
2136 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2137 cur, current_tpt, sr, weak, strong,
2138 weak_tpt, strong_tpt);
2139
2140 action = rs_get_tpc_action(mvm, sr, weak, strong,
2141 current_tpt, weak_tpt, strong_tpt);
2142
2143 /* override actions if we are on the edge */
2144 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2145 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2146 action = TPC_ACTION_STAY;
2147 } else if (strong == TPC_INVALID &&
2148 (action == TPC_ACTION_INCREASE ||
2149 action == TPC_ACTION_NO_RESTIRCTION)) {
2150 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2151 action = TPC_ACTION_STAY;
2152 }
2153
2154 switch (action) {
2155 case TPC_ACTION_DECREASE:
2156 lq_sta->lq.reduced_tpc = weak;
2157 return true;
2158 case TPC_ACTION_INCREASE:
2159 lq_sta->lq.reduced_tpc = strong;
2160 return true;
2161 case TPC_ACTION_NO_RESTIRCTION:
2162 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2163 return true;
2164 case TPC_ACTION_STAY:
2165 /* do nothing */
2166 break;
2167 }
2168 return false;
2169 }
2170
2171 /*
2172 * Do rate scaling and search for new modulation mode.
2173 */
2174 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2175 struct ieee80211_sta *sta,
2176 struct iwl_lq_sta *lq_sta,
2177 int tid)
2178 {
2179 int low = IWL_RATE_INVALID;
2180 int high = IWL_RATE_INVALID;
2181 int index;
2182 struct iwl_rate_scale_data *window = NULL;
2183 int current_tpt = IWL_INVALID_VALUE;
2184 int low_tpt = IWL_INVALID_VALUE;
2185 int high_tpt = IWL_INVALID_VALUE;
2186 u32 fail_count;
2187 enum rs_action scale_action = RS_ACTION_STAY;
2188 u16 rate_mask;
2189 u8 update_lq = 0;
2190 struct iwl_scale_tbl_info *tbl, *tbl1;
2191 u8 active_tbl = 0;
2192 u8 done_search = 0;
2193 u16 high_low;
2194 s32 sr;
2195 u8 prev_agg = lq_sta->is_agg;
2196 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2197 struct iwl_mvm_tid_data *tid_data;
2198 struct rs_rate *rate;
2199
2200 lq_sta->is_agg = !!sta_priv->agg_tids;
2201
2202 /*
2203 * Select rate-scale / modulation-mode table to work with in
2204 * the rest of this function: "search" if searching for better
2205 * modulation mode, or "active" if doing rate scaling within a mode.
2206 */
2207 if (!lq_sta->search_better_tbl)
2208 active_tbl = lq_sta->active_tbl;
2209 else
2210 active_tbl = 1 - lq_sta->active_tbl;
2211
2212 tbl = &(lq_sta->lq_info[active_tbl]);
2213 rate = &tbl->rate;
2214
2215 if (prev_agg != lq_sta->is_agg) {
2216 IWL_DEBUG_RATE(mvm,
2217 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2218 prev_agg, lq_sta->is_agg);
2219 rs_set_expected_tpt_table(lq_sta, tbl);
2220 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2221 }
2222
2223 /* current tx rate */
2224 index = rate->index;
2225
2226 /* rates available for this association, and for modulation mode */
2227 rate_mask = rs_get_supported_rates(lq_sta, rate);
2228
2229 if (!(BIT(index) & rate_mask)) {
2230 IWL_ERR(mvm, "Current Rate is not valid\n");
2231 if (lq_sta->search_better_tbl) {
2232 /* revert to active table if search table is not valid*/
2233 rate->type = LQ_NONE;
2234 lq_sta->search_better_tbl = 0;
2235 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2236 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2237 }
2238 return;
2239 }
2240
2241 /* Get expected throughput table and history window for current rate */
2242 if (!tbl->expected_tpt) {
2243 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2244 return;
2245 }
2246
2247 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2248 window = &(tbl->win[index]);
2249
2250 /*
2251 * If there is not enough history to calculate actual average
2252 * throughput, keep analyzing results of more tx frames, without
2253 * changing rate or mode (bypass most of the rest of this function).
2254 * Set up new rate table in uCode only if old rate is not supported
2255 * in current association (use new rate found above).
2256 */
2257 fail_count = window->counter - window->success_counter;
2258 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2259 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2260 IWL_DEBUG_RATE(mvm,
2261 "%s: Test Window: succ %d total %d\n",
2262 rs_pretty_rate(rate),
2263 window->success_counter, window->counter);
2264
2265 /* Can't calculate this yet; not enough history */
2266 window->average_tpt = IWL_INVALID_VALUE;
2267
2268 /* Should we stay with this modulation mode,
2269 * or search for a new one? */
2270 rs_stay_in_table(lq_sta, false);
2271
2272 return;
2273 }
2274
2275 /* If we are searching for better modulation mode, check success. */
2276 if (lq_sta->search_better_tbl) {
2277 /* If good success, continue using the "search" mode;
2278 * no need to send new link quality command, since we're
2279 * continuing to use the setup that we've been trying. */
2280 if (window->average_tpt > lq_sta->last_tpt) {
2281 IWL_DEBUG_RATE(mvm,
2282 "SWITCHING TO NEW TABLE SR: %d "
2283 "cur-tpt %d old-tpt %d\n",
2284 window->success_ratio,
2285 window->average_tpt,
2286 lq_sta->last_tpt);
2287
2288 /* Swap tables; "search" becomes "active" */
2289 lq_sta->active_tbl = active_tbl;
2290 current_tpt = window->average_tpt;
2291 /* Else poor success; go back to mode in "active" table */
2292 } else {
2293 IWL_DEBUG_RATE(mvm,
2294 "GOING BACK TO THE OLD TABLE: SR %d "
2295 "cur-tpt %d old-tpt %d\n",
2296 window->success_ratio,
2297 window->average_tpt,
2298 lq_sta->last_tpt);
2299
2300 /* Nullify "search" table */
2301 rate->type = LQ_NONE;
2302
2303 /* Revert to "active" table */
2304 active_tbl = lq_sta->active_tbl;
2305 tbl = &(lq_sta->lq_info[active_tbl]);
2306
2307 /* Revert to "active" rate and throughput info */
2308 index = tbl->rate.index;
2309 current_tpt = lq_sta->last_tpt;
2310
2311 /* Need to set up a new rate table in uCode */
2312 update_lq = 1;
2313 }
2314
2315 /* Either way, we've made a decision; modulation mode
2316 * search is done, allow rate adjustment next time. */
2317 lq_sta->search_better_tbl = 0;
2318 done_search = 1; /* Don't switch modes below! */
2319 goto lq_update;
2320 }
2321
2322 /* (Else) not in search of better modulation mode, try for better
2323 * starting rate, while staying in this mode. */
2324 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2325 low = high_low & 0xff;
2326 high = (high_low >> 8) & 0xff;
2327
2328 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2329
2330 sr = window->success_ratio;
2331
2332 /* Collect measured throughputs for current and adjacent rates */
2333 current_tpt = window->average_tpt;
2334 if (low != IWL_RATE_INVALID)
2335 low_tpt = tbl->win[low].average_tpt;
2336 if (high != IWL_RATE_INVALID)
2337 high_tpt = tbl->win[high].average_tpt;
2338
2339 IWL_DEBUG_RATE(mvm,
2340 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2341 rs_pretty_rate(rate), current_tpt, sr,
2342 low, high, low_tpt, high_tpt);
2343
2344 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2345 current_tpt, low_tpt, high_tpt);
2346
2347 /* Force a search in case BT doesn't like us being in MIMO */
2348 if (is_mimo(rate) &&
2349 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2350 IWL_DEBUG_RATE(mvm,
2351 "BT Coex forbids MIMO. Search for new config\n");
2352 rs_stay_in_table(lq_sta, true);
2353 goto lq_update;
2354 }
2355
2356 switch (scale_action) {
2357 case RS_ACTION_DOWNSCALE:
2358 /* Decrease starting rate, update uCode's rate table */
2359 if (low != IWL_RATE_INVALID) {
2360 update_lq = 1;
2361 index = low;
2362 } else {
2363 IWL_DEBUG_RATE(mvm,
2364 "At the bottom rate. Can't decrease\n");
2365 }
2366
2367 break;
2368 case RS_ACTION_UPSCALE:
2369 /* Increase starting rate, update uCode's rate table */
2370 if (high != IWL_RATE_INVALID) {
2371 update_lq = 1;
2372 index = high;
2373 } else {
2374 IWL_DEBUG_RATE(mvm,
2375 "At the top rate. Can't increase\n");
2376 }
2377
2378 break;
2379 case RS_ACTION_STAY:
2380 /* No change */
2381 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2382 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2383 break;
2384 default:
2385 break;
2386 }
2387
2388 lq_update:
2389 /* Replace uCode's rate table for the destination station. */
2390 if (update_lq) {
2391 tbl->rate.index = index;
2392 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2393 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2394 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2395 }
2396
2397 rs_stay_in_table(lq_sta, false);
2398
2399 /*
2400 * Search for new modulation mode if we're:
2401 * 1) Not changing rates right now
2402 * 2) Not just finishing up a search
2403 * 3) Allowing a new search
2404 */
2405 if (!update_lq && !done_search &&
2406 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2407 && window->counter) {
2408 enum rs_column next_column;
2409
2410 /* Save current throughput to compare with "search" throughput*/
2411 lq_sta->last_tpt = current_tpt;
2412
2413 IWL_DEBUG_RATE(mvm,
2414 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2415 update_lq, done_search, lq_sta->rs_state,
2416 window->counter);
2417
2418 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2419 if (next_column != RS_COLUMN_INVALID) {
2420 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2421 next_column);
2422 if (!ret)
2423 lq_sta->search_better_tbl = 1;
2424 } else {
2425 IWL_DEBUG_RATE(mvm,
2426 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2427 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2428 }
2429
2430 /* If new "search" mode was selected, set up in uCode table */
2431 if (lq_sta->search_better_tbl) {
2432 /* Access the "search" table, clear its history. */
2433 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2434 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2435
2436 /* Use new "search" start rate */
2437 index = tbl->rate.index;
2438
2439 rs_dump_rate(mvm, &tbl->rate,
2440 "Switch to SEARCH TABLE:");
2441 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2442 } else {
2443 done_search = 1;
2444 }
2445 }
2446
2447 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2448 /* If the "active" (non-search) mode was legacy,
2449 * and we've tried switching antennas,
2450 * but we haven't been able to try HT modes (not available),
2451 * stay with best antenna legacy modulation for a while
2452 * before next round of mode comparisons. */
2453 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2454 if (is_legacy(&tbl1->rate)) {
2455 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2456
2457 if (tid != IWL_MAX_TID_COUNT) {
2458 tid_data = &sta_priv->tid_data[tid];
2459 if (tid_data->state != IWL_AGG_OFF) {
2460 IWL_DEBUG_RATE(mvm,
2461 "Stop aggregation on tid %d\n",
2462 tid);
2463 ieee80211_stop_tx_ba_session(sta, tid);
2464 }
2465 }
2466 rs_set_stay_in_table(mvm, 1, lq_sta);
2467 } else {
2468 /* If we're in an HT mode, and all 3 mode switch actions
2469 * have been tried and compared, stay in this best modulation
2470 * mode for a while before next round of mode comparisons. */
2471 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2472 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2473 (tid != IWL_MAX_TID_COUNT)) {
2474 tid_data = &sta_priv->tid_data[tid];
2475 if (tid_data->state == IWL_AGG_OFF) {
2476 IWL_DEBUG_RATE(mvm,
2477 "try to aggregate tid %d\n",
2478 tid);
2479 rs_tl_turn_on_agg(mvm, tid,
2480 lq_sta, sta);
2481 }
2482 }
2483 rs_set_stay_in_table(mvm, 0, lq_sta);
2484 }
2485 }
2486 }
2487
2488 struct rs_init_rate_info {
2489 s8 rssi;
2490 u8 rate_idx;
2491 };
2492
2493 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2494 { -60, IWL_RATE_54M_INDEX },
2495 { -64, IWL_RATE_48M_INDEX },
2496 { -68, IWL_RATE_36M_INDEX },
2497 { -80, IWL_RATE_24M_INDEX },
2498 { -84, IWL_RATE_18M_INDEX },
2499 { -85, IWL_RATE_12M_INDEX },
2500 { -86, IWL_RATE_11M_INDEX },
2501 { -88, IWL_RATE_5M_INDEX },
2502 { -90, IWL_RATE_2M_INDEX },
2503 { S8_MIN, IWL_RATE_1M_INDEX },
2504 };
2505
2506 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2507 { -60, IWL_RATE_54M_INDEX },
2508 { -64, IWL_RATE_48M_INDEX },
2509 { -72, IWL_RATE_36M_INDEX },
2510 { -80, IWL_RATE_24M_INDEX },
2511 { -84, IWL_RATE_18M_INDEX },
2512 { -85, IWL_RATE_12M_INDEX },
2513 { -87, IWL_RATE_9M_INDEX },
2514 { S8_MIN, IWL_RATE_6M_INDEX },
2515 };
2516
2517 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2518 { -60, IWL_RATE_MCS_7_INDEX },
2519 { -64, IWL_RATE_MCS_6_INDEX },
2520 { -68, IWL_RATE_MCS_5_INDEX },
2521 { -72, IWL_RATE_MCS_4_INDEX },
2522 { -80, IWL_RATE_MCS_3_INDEX },
2523 { -84, IWL_RATE_MCS_2_INDEX },
2524 { -85, IWL_RATE_MCS_1_INDEX },
2525 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2526 };
2527
2528 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2529 { -60, IWL_RATE_MCS_8_INDEX },
2530 { -64, IWL_RATE_MCS_7_INDEX },
2531 { -68, IWL_RATE_MCS_6_INDEX },
2532 { -72, IWL_RATE_MCS_5_INDEX },
2533 { -80, IWL_RATE_MCS_4_INDEX },
2534 { -84, IWL_RATE_MCS_3_INDEX },
2535 { -85, IWL_RATE_MCS_2_INDEX },
2536 { -87, IWL_RATE_MCS_1_INDEX },
2537 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2538 };
2539
2540 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
2541 { -60, IWL_RATE_MCS_9_INDEX },
2542 { -64, IWL_RATE_MCS_8_INDEX },
2543 { -68, IWL_RATE_MCS_7_INDEX },
2544 { -72, IWL_RATE_MCS_6_INDEX },
2545 { -80, IWL_RATE_MCS_5_INDEX },
2546 { -84, IWL_RATE_MCS_4_INDEX },
2547 { -85, IWL_RATE_MCS_3_INDEX },
2548 { -87, IWL_RATE_MCS_2_INDEX },
2549 { -88, IWL_RATE_MCS_1_INDEX },
2550 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2551 };
2552
2553 /* Init the optimal rate based on STA caps
2554 * This combined with rssi is used to report the last tx rate
2555 * to userspace when we haven't transmitted enough frames.
2556 */
2557 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2558 struct ieee80211_sta *sta,
2559 struct iwl_lq_sta *lq_sta)
2560 {
2561 struct rs_rate *rate = &lq_sta->optimal_rate;
2562
2563 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2564 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2565 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2566 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2567 else if (lq_sta->band == IEEE80211_BAND_5GHZ)
2568 rate->type = LQ_LEGACY_A;
2569 else
2570 rate->type = LQ_LEGACY_G;
2571
2572 rate->bw = rs_bw_from_sta_bw(sta);
2573 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2574
2575 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2576
2577 if (is_mimo(rate)) {
2578 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2579 } else if (is_siso(rate)) {
2580 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2581 } else {
2582 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2583
2584 if (lq_sta->band == IEEE80211_BAND_5GHZ) {
2585 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2586 lq_sta->optimal_nentries =
2587 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2588 } else {
2589 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2590 lq_sta->optimal_nentries =
2591 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2592 }
2593 }
2594
2595 if (is_vht(rate)) {
2596 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2597 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2598 lq_sta->optimal_nentries =
2599 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2600 } else {
2601 lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
2602 lq_sta->optimal_nentries =
2603 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2604 }
2605 } else if (is_ht(rate)) {
2606 lq_sta->optimal_rates = rs_optimal_rates_ht;
2607 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2608 }
2609 }
2610
2611 /* Compute the optimal rate index based on RSSI */
2612 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2613 struct iwl_lq_sta *lq_sta)
2614 {
2615 struct rs_rate *rate = &lq_sta->optimal_rate;
2616 int i;
2617
2618 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2619 BITS_PER_LONG);
2620
2621 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2622 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2623
2624 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2625 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2626 rate->index = rate_idx;
2627 break;
2628 }
2629 }
2630
2631 return rate;
2632 }
2633
2634 /* Choose an initial legacy rate and antenna to use based on the RSSI
2635 * of last Rx
2636 */
2637 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2638 struct iwl_lq_sta *lq_sta,
2639 enum ieee80211_band band,
2640 struct rs_rate *rate)
2641 {
2642 int i, nentries;
2643 s8 best_rssi = S8_MIN;
2644 u8 best_ant = ANT_NONE;
2645 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2646 const struct rs_init_rate_info *initial_rates;
2647
2648 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2649 if (!(lq_sta->pers.chains & BIT(i)))
2650 continue;
2651
2652 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2653 best_rssi = lq_sta->pers.chain_signal[i];
2654 best_ant = BIT(i);
2655 }
2656 }
2657
2658 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2659 rs_pretty_ant(best_ant), best_rssi);
2660
2661 if (best_ant != ANT_A && best_ant != ANT_B)
2662 rate->ant = first_antenna(valid_tx_ant);
2663 else
2664 rate->ant = best_ant;
2665
2666 rate->sgi = false;
2667 rate->ldpc = false;
2668 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2669
2670 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2671 BITS_PER_LONG);
2672
2673 if (band == IEEE80211_BAND_5GHZ) {
2674 rate->type = LQ_LEGACY_A;
2675 initial_rates = rs_optimal_rates_5ghz_legacy;
2676 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2677 } else {
2678 rate->type = LQ_LEGACY_G;
2679 initial_rates = rs_optimal_rates_24ghz_legacy;
2680 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2681 }
2682
2683 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2684 for (i = 0; i < nentries; i++) {
2685 int rate_idx = initial_rates[i].rate_idx;
2686 if ((best_rssi >= initial_rates[i].rssi) &&
2687 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2688 rate->index = rate_idx;
2689 break;
2690 }
2691 }
2692 }
2693
2694 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2695 rs_pretty_ant(rate->ant));
2696 }
2697
2698 /* Save info about RSSI of last Rx */
2699 void rs_update_last_rssi(struct iwl_mvm *mvm,
2700 struct iwl_lq_sta *lq_sta,
2701 struct ieee80211_rx_status *rx_status)
2702 {
2703 int i;
2704
2705 lq_sta->pers.chains = rx_status->chains;
2706 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2707 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2708 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2709 lq_sta->pers.last_rssi = S8_MIN;
2710
2711 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2712 if (!(lq_sta->pers.chains & BIT(i)))
2713 continue;
2714
2715 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2716 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2717 }
2718 }
2719
2720 /**
2721 * rs_initialize_lq - Initialize a station's hardware rate table
2722 *
2723 * The uCode's station table contains a table of fallback rates
2724 * for automatic fallback during transmission.
2725 *
2726 * NOTE: This sets up a default set of values. These will be replaced later
2727 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2728 * rc80211_simple.
2729 *
2730 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2731 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2732 * which requires station table entry to exist).
2733 */
2734 static void rs_initialize_lq(struct iwl_mvm *mvm,
2735 struct ieee80211_sta *sta,
2736 struct iwl_lq_sta *lq_sta,
2737 enum ieee80211_band band,
2738 bool init)
2739 {
2740 struct iwl_scale_tbl_info *tbl;
2741 struct rs_rate *rate;
2742 u8 active_tbl = 0;
2743
2744 if (!sta || !lq_sta)
2745 return;
2746
2747 if (!lq_sta->search_better_tbl)
2748 active_tbl = lq_sta->active_tbl;
2749 else
2750 active_tbl = 1 - lq_sta->active_tbl;
2751
2752 tbl = &(lq_sta->lq_info[active_tbl]);
2753 rate = &tbl->rate;
2754
2755 rs_get_initial_rate(mvm, lq_sta, band, rate);
2756 rs_init_optimal_rate(mvm, sta, lq_sta);
2757
2758 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2759 if (rate->ant == ANT_A)
2760 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2761 else
2762 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2763
2764 rs_set_expected_tpt_table(lq_sta, tbl);
2765 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2766 /* TODO restore station should remember the lq cmd */
2767 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2768 }
2769
2770 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2771 struct ieee80211_tx_rate_control *txrc)
2772 {
2773 struct sk_buff *skb = txrc->skb;
2774 struct iwl_op_mode *op_mode __maybe_unused =
2775 (struct iwl_op_mode *)mvm_r;
2776 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2777 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2778 struct iwl_lq_sta *lq_sta = mvm_sta;
2779 struct rs_rate *optimal_rate;
2780 u32 last_ucode_rate;
2781
2782 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2783 /* if vif isn't initialized mvm doesn't know about
2784 * this station, so don't do anything with the it
2785 */
2786 sta = NULL;
2787 mvm_sta = NULL;
2788 }
2789
2790 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2791
2792 /* Treat uninitialized rate scaling data same as non-existing. */
2793 if (lq_sta && !lq_sta->pers.drv) {
2794 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2795 mvm_sta = NULL;
2796 }
2797
2798 /* Send management frames and NO_ACK data using lowest rate. */
2799 if (rate_control_send_low(sta, mvm_sta, txrc))
2800 return;
2801
2802 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2803 info->band, &info->control.rates[0]);
2804 info->control.rates[0].count = 1;
2805
2806 /* Report the optimal rate based on rssi and STA caps if we haven't
2807 * converged yet (too little traffic) or exploring other modulations
2808 */
2809 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2810 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2811 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2812 optimal_rate);
2813 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2814 &txrc->reported_rate);
2815 }
2816 }
2817
2818 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2819 gfp_t gfp)
2820 {
2821 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2822 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2823 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2824 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2825
2826 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2827
2828 lq_sta->pers.drv = mvm;
2829 #ifdef CONFIG_MAC80211_DEBUGFS
2830 lq_sta->pers.dbg_fixed_rate = 0;
2831 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2832 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2833 #endif
2834 lq_sta->pers.chains = 0;
2835 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2836 lq_sta->pers.last_rssi = S8_MIN;
2837
2838 return &sta_priv->lq_sta;
2839 }
2840
2841 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2842 int nss)
2843 {
2844 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2845 (0x3 << (2 * (nss - 1)));
2846 rx_mcs >>= (2 * (nss - 1));
2847
2848 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2849 return IWL_RATE_MCS_7_INDEX;
2850 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2851 return IWL_RATE_MCS_8_INDEX;
2852 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2853 return IWL_RATE_MCS_9_INDEX;
2854
2855 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2856 return -1;
2857 }
2858
2859 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2860 struct ieee80211_sta_vht_cap *vht_cap,
2861 struct iwl_lq_sta *lq_sta)
2862 {
2863 int i;
2864 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2865
2866 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2867 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2868 if (i == IWL_RATE_9M_INDEX)
2869 continue;
2870
2871 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2872 if (i == IWL_RATE_MCS_9_INDEX &&
2873 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2874 continue;
2875
2876 lq_sta->active_siso_rate |= BIT(i);
2877 }
2878 }
2879
2880 if (sta->rx_nss < 2)
2881 return;
2882
2883 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2884 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2885 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2886 if (i == IWL_RATE_9M_INDEX)
2887 continue;
2888
2889 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2890 if (i == IWL_RATE_MCS_9_INDEX &&
2891 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2892 continue;
2893
2894 lq_sta->active_mimo2_rate |= BIT(i);
2895 }
2896 }
2897 }
2898
2899 static void rs_ht_init(struct iwl_mvm *mvm,
2900 struct ieee80211_sta *sta,
2901 struct iwl_lq_sta *lq_sta,
2902 struct ieee80211_sta_ht_cap *ht_cap)
2903 {
2904 /* active_siso_rate mask includes 9 MBits (bit 5),
2905 * and CCK (bits 0-3), supp_rates[] does not;
2906 * shift to convert format, force 9 MBits off.
2907 */
2908 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2909 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2910 lq_sta->active_siso_rate &= ~((u16)0x2);
2911 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2912
2913 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2914 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2915 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2916 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2917
2918 if (mvm->cfg->ht_params->ldpc &&
2919 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2920 lq_sta->ldpc = true;
2921
2922 if (mvm->cfg->ht_params->stbc &&
2923 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2924 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2925 lq_sta->stbc_capable = true;
2926
2927 lq_sta->is_vht = false;
2928 }
2929
2930 static void rs_vht_init(struct iwl_mvm *mvm,
2931 struct ieee80211_sta *sta,
2932 struct iwl_lq_sta *lq_sta,
2933 struct ieee80211_sta_vht_cap *vht_cap)
2934 {
2935 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2936
2937 if (mvm->cfg->ht_params->ldpc &&
2938 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2939 lq_sta->ldpc = true;
2940
2941 if (mvm->cfg->ht_params->stbc &&
2942 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2943 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2944 lq_sta->stbc_capable = true;
2945
2946 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2947 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2948 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2949 lq_sta->bfer_capable = true;
2950
2951 lq_sta->is_vht = true;
2952 }
2953
2954 #ifdef CONFIG_IWLWIFI_DEBUGFS
2955 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2956 {
2957 spin_lock_bh(&mvm->drv_stats_lock);
2958 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2959 spin_unlock_bh(&mvm->drv_stats_lock);
2960 }
2961
2962 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2963 {
2964 u8 nss = 0, mcs = 0;
2965
2966 spin_lock(&mvm->drv_stats_lock);
2967
2968 if (agg)
2969 mvm->drv_rx_stats.agg_frames++;
2970
2971 mvm->drv_rx_stats.success_frames++;
2972
2973 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2974 case RATE_MCS_CHAN_WIDTH_20:
2975 mvm->drv_rx_stats.bw_20_frames++;
2976 break;
2977 case RATE_MCS_CHAN_WIDTH_40:
2978 mvm->drv_rx_stats.bw_40_frames++;
2979 break;
2980 case RATE_MCS_CHAN_WIDTH_80:
2981 mvm->drv_rx_stats.bw_80_frames++;
2982 break;
2983 default:
2984 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2985 }
2986
2987 if (rate & RATE_MCS_HT_MSK) {
2988 mvm->drv_rx_stats.ht_frames++;
2989 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2990 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2991 } else if (rate & RATE_MCS_VHT_MSK) {
2992 mvm->drv_rx_stats.vht_frames++;
2993 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2994 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2995 RATE_VHT_MCS_NSS_POS) + 1;
2996 } else {
2997 mvm->drv_rx_stats.legacy_frames++;
2998 }
2999
3000 if (nss == 1)
3001 mvm->drv_rx_stats.siso_frames++;
3002 else if (nss == 2)
3003 mvm->drv_rx_stats.mimo2_frames++;
3004
3005 if (rate & RATE_MCS_SGI_MSK)
3006 mvm->drv_rx_stats.sgi_frames++;
3007 else
3008 mvm->drv_rx_stats.ngi_frames++;
3009
3010 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3011 mvm->drv_rx_stats.last_frame_idx =
3012 (mvm->drv_rx_stats.last_frame_idx + 1) %
3013 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3014
3015 spin_unlock(&mvm->drv_stats_lock);
3016 }
3017 #endif
3018
3019 /*
3020 * Called after adding a new station to initialize rate scaling
3021 */
3022 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3023 enum ieee80211_band band, bool init)
3024 {
3025 int i, j;
3026 struct ieee80211_hw *hw = mvm->hw;
3027 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3028 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3029 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3030 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3031 struct ieee80211_supported_band *sband;
3032 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3033
3034 /* clear all non-persistent lq data */
3035 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3036
3037 sband = hw->wiphy->bands[band];
3038
3039 lq_sta->lq.sta_id = sta_priv->sta_id;
3040
3041 for (j = 0; j < LQ_SIZE; j++)
3042 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3043
3044 lq_sta->flush_timer = 0;
3045 lq_sta->last_tx = jiffies;
3046
3047 IWL_DEBUG_RATE(mvm,
3048 "LQ: *** rate scale station global init for station %d ***\n",
3049 sta_priv->sta_id);
3050 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3051 * the lowest or the highest rate.. Could consider using RSSI from
3052 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3053 * after assoc.. */
3054
3055 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3056 lq_sta->band = sband->band;
3057 /*
3058 * active legacy rates as per supported rates bitmap
3059 */
3060 supp = sta->supp_rates[sband->band];
3061 lq_sta->active_legacy_rate = 0;
3062 for_each_set_bit(i, &supp, BITS_PER_LONG)
3063 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3064
3065 /* TODO: should probably account for rx_highest for both HT/VHT */
3066 if (!vht_cap || !vht_cap->vht_supported)
3067 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3068 else
3069 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3070
3071 lq_sta->max_legacy_rate_idx =
3072 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3073 lq_sta->max_siso_rate_idx =
3074 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3075 lq_sta->max_mimo2_rate_idx =
3076 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3077
3078 IWL_DEBUG_RATE(mvm,
3079 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3080 lq_sta->active_legacy_rate,
3081 lq_sta->active_siso_rate,
3082 lq_sta->active_mimo2_rate,
3083 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3084 lq_sta->bfer_capable);
3085 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3086 lq_sta->max_legacy_rate_idx,
3087 lq_sta->max_siso_rate_idx,
3088 lq_sta->max_mimo2_rate_idx);
3089
3090 /* These values will be overridden later */
3091 lq_sta->lq.single_stream_ant_msk =
3092 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3093 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3094
3095 /* as default allow aggregation for all tids */
3096 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3097 lq_sta->is_agg = 0;
3098 #ifdef CONFIG_IWLWIFI_DEBUGFS
3099 iwl_mvm_reset_frame_stats(mvm);
3100 #endif
3101 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3102 }
3103
3104 static void rs_rate_update(void *mvm_r,
3105 struct ieee80211_supported_band *sband,
3106 struct cfg80211_chan_def *chandef,
3107 struct ieee80211_sta *sta, void *priv_sta,
3108 u32 changed)
3109 {
3110 u8 tid;
3111 struct iwl_op_mode *op_mode =
3112 (struct iwl_op_mode *)mvm_r;
3113 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3114
3115 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3116 return;
3117
3118 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3119 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3120 ieee80211_stop_tx_ba_session(sta, tid);
3121
3122 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3123 }
3124
3125 #ifdef CONFIG_MAC80211_DEBUGFS
3126 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3127 struct iwl_lq_cmd *lq_cmd,
3128 enum ieee80211_band band,
3129 u32 ucode_rate)
3130 {
3131 struct rs_rate rate;
3132 int i;
3133 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3134 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3135 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3136
3137 for (i = 0; i < num_rates; i++)
3138 lq_cmd->rs_table[i] = ucode_rate_le32;
3139
3140 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3141
3142 if (is_mimo(&rate))
3143 lq_cmd->mimo_delim = num_rates - 1;
3144 else
3145 lq_cmd->mimo_delim = 0;
3146
3147 lq_cmd->reduced_tpc = 0;
3148
3149 if (num_of_ant(ant) == 1)
3150 lq_cmd->single_stream_ant_msk = ant;
3151
3152 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3153 }
3154 #endif /* CONFIG_MAC80211_DEBUGFS */
3155
3156 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3157 struct iwl_lq_sta *lq_sta,
3158 struct rs_rate *rate,
3159 __le32 *rs_table, int *rs_table_index,
3160 int num_rates, int num_retries,
3161 u8 valid_tx_ant, bool toggle_ant)
3162 {
3163 int i, j;
3164 __le32 ucode_rate;
3165 bool bottom_reached = false;
3166 int prev_rate_idx = rate->index;
3167 int end = LINK_QUAL_MAX_RETRY_NUM;
3168 int index = *rs_table_index;
3169
3170 for (i = 0; i < num_rates && index < end; i++) {
3171 for (j = 0; j < num_retries && index < end; j++, index++) {
3172 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3173 rate));
3174 rs_table[index] = ucode_rate;
3175 if (toggle_ant)
3176 rs_toggle_antenna(valid_tx_ant, rate);
3177 }
3178
3179 prev_rate_idx = rate->index;
3180 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3181 if (bottom_reached && !is_legacy(rate))
3182 break;
3183 }
3184
3185 if (!bottom_reached && !is_legacy(rate))
3186 rate->index = prev_rate_idx;
3187
3188 *rs_table_index = index;
3189 }
3190
3191 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3192 * column the rate table should look like this:
3193 *
3194 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3195 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3196 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3197 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3198 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3199 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3200 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3201 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3202 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3203 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3204 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3205 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3206 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3207 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3208 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3209 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3210 */
3211 static void rs_build_rates_table(struct iwl_mvm *mvm,
3212 struct ieee80211_sta *sta,
3213 struct iwl_lq_sta *lq_sta,
3214 const struct rs_rate *initial_rate)
3215 {
3216 struct rs_rate rate;
3217 int num_rates, num_retries, index = 0;
3218 u8 valid_tx_ant = 0;
3219 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3220 bool toggle_ant = false;
3221
3222 memcpy(&rate, initial_rate, sizeof(rate));
3223
3224 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3225
3226 /* TODO: remove old API when min FW API hits 14 */
3227 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3228 rs_stbc_allow(mvm, sta, lq_sta))
3229 rate.stbc = true;
3230
3231 if (is_siso(&rate)) {
3232 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3233 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3234 } else if (is_mimo(&rate)) {
3235 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3236 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3237 } else {
3238 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3239 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3240 toggle_ant = true;
3241 }
3242
3243 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3244 num_rates, num_retries, valid_tx_ant,
3245 toggle_ant);
3246
3247 rs_get_lower_rate_down_column(lq_sta, &rate);
3248
3249 if (is_siso(&rate)) {
3250 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3251 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3252 lq_cmd->mimo_delim = index;
3253 } else if (is_legacy(&rate)) {
3254 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3255 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3256 } else {
3257 WARN_ON_ONCE(1);
3258 }
3259
3260 toggle_ant = true;
3261
3262 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3263 num_rates, num_retries, valid_tx_ant,
3264 toggle_ant);
3265
3266 rs_get_lower_rate_down_column(lq_sta, &rate);
3267
3268 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3269 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3270
3271 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3272 num_rates, num_retries, valid_tx_ant,
3273 toggle_ant);
3274
3275 }
3276
3277 struct rs_bfer_active_iter_data {
3278 struct ieee80211_sta *exclude_sta;
3279 struct iwl_mvm_sta *bfer_mvmsta;
3280 };
3281
3282 static void rs_bfer_active_iter(void *_data,
3283 struct ieee80211_sta *sta)
3284 {
3285 struct rs_bfer_active_iter_data *data = _data;
3286 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3287 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3288 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3289
3290 if (sta == data->exclude_sta)
3291 return;
3292
3293 /* The current sta has BFER allowed */
3294 if (ss_params & LQ_SS_BFER_ALLOWED) {
3295 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3296
3297 data->bfer_mvmsta = mvmsta;
3298 }
3299 }
3300
3301 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3302 {
3303 int prio = -1;
3304 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3305
3306 switch (viftype) {
3307 case NL80211_IFTYPE_AP:
3308 case NL80211_IFTYPE_P2P_GO:
3309 prio = 3;
3310 break;
3311 case NL80211_IFTYPE_P2P_CLIENT:
3312 prio = 2;
3313 break;
3314 case NL80211_IFTYPE_STATION:
3315 prio = 1;
3316 break;
3317 default:
3318 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3319 prio = -1;
3320 }
3321
3322 return prio;
3323 }
3324
3325 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3326 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3327 struct iwl_mvm_sta *sta2)
3328 {
3329 int prio1 = rs_bfer_priority(sta1);
3330 int prio2 = rs_bfer_priority(sta2);
3331
3332 if (prio1 > prio2)
3333 return 1;
3334 if (prio1 < prio2)
3335 return -1;
3336 return 0;
3337 }
3338
3339 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3340 struct ieee80211_sta *sta,
3341 struct iwl_lq_sta *lq_sta,
3342 const struct rs_rate *initial_rate)
3343 {
3344 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3345 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3346 struct rs_bfer_active_iter_data data = {
3347 .exclude_sta = sta,
3348 .bfer_mvmsta = NULL,
3349 };
3350 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3351 u32 ss_params = LQ_SS_PARAMS_VALID;
3352
3353 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3354 goto out;
3355
3356 #ifdef CONFIG_MAC80211_DEBUGFS
3357 /* Check if forcing the decision is configured.
3358 * Note that SISO is forced by not allowing STBC or BFER
3359 */
3360 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3361 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3362 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3363 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3364
3365 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3366 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3367 lq_sta->pers.ss_force);
3368 goto out;
3369 }
3370 #endif
3371
3372 if (lq_sta->stbc_capable)
3373 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3374
3375 if (!lq_sta->bfer_capable)
3376 goto out;
3377
3378 ieee80211_iterate_stations_atomic(mvm->hw,
3379 rs_bfer_active_iter,
3380 &data);
3381 bfer_mvmsta = data.bfer_mvmsta;
3382
3383 /* This code is safe as it doesn't run concurrently for different
3384 * stations. This is guaranteed by the fact that calls to
3385 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3386 */
3387 if (!bfer_mvmsta) {
3388 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3389
3390 ss_params |= LQ_SS_BFER_ALLOWED;
3391 goto out;
3392 }
3393
3394 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3395 bfer_mvmsta->sta_id);
3396
3397 /* Disallow BFER on another STA if active and we're a higher priority */
3398 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3399 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3400 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3401
3402 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3403 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3404 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3405
3406 ss_params |= LQ_SS_BFER_ALLOWED;
3407 IWL_DEBUG_RATE(mvm,
3408 "Lower priority BFER sta found (%d). Switch BFER\n",
3409 bfer_mvmsta->sta_id);
3410 }
3411 out:
3412 lq_cmd->ss_params = cpu_to_le32(ss_params);
3413 }
3414
3415 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3416 struct ieee80211_sta *sta,
3417 struct iwl_lq_sta *lq_sta,
3418 const struct rs_rate *initial_rate)
3419 {
3420 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3421 struct iwl_mvm_sta *mvmsta;
3422 struct iwl_mvm_vif *mvmvif;
3423
3424 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3425 lq_cmd->agg_time_limit =
3426 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3427
3428 #ifdef CONFIG_MAC80211_DEBUGFS
3429 if (lq_sta->pers.dbg_fixed_rate) {
3430 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3431 lq_sta->band,
3432 lq_sta->pers.dbg_fixed_rate);
3433 return;
3434 }
3435 #endif
3436 if (WARN_ON_ONCE(!sta || !initial_rate))
3437 return;
3438
3439 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3440
3441 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3442 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3443
3444 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3445 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3446
3447 if (num_of_ant(initial_rate->ant) == 1)
3448 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3449
3450 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3451
3452 /*
3453 * In case of low latency, tell the firmware to leave a frame in the
3454 * Tx Fifo so that it can start a transaction in the same TxOP. This
3455 * basically allows the firmware to send bursts.
3456 */
3457 if (iwl_mvm_vif_low_latency(mvmvif))
3458 lq_cmd->agg_frame_cnt_limit--;
3459
3460 if (mvmsta->vif->p2p)
3461 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3462
3463 lq_cmd->agg_time_limit =
3464 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3465 }
3466
3467 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3468 {
3469 return hw->priv;
3470 }
3471 /* rate scale requires free function to be implemented */
3472 static void rs_free(void *mvm_rate)
3473 {
3474 return;
3475 }
3476
3477 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3478 void *mvm_sta)
3479 {
3480 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3481 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3482
3483 IWL_DEBUG_RATE(mvm, "enter\n");
3484 IWL_DEBUG_RATE(mvm, "leave\n");
3485 }
3486
3487 #ifdef CONFIG_MAC80211_DEBUGFS
3488 int rs_pretty_print_rate(char *buf, const u32 rate)
3489 {
3490
3491 char *type, *bw;
3492 u8 mcs = 0, nss = 0;
3493 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3494
3495 if (!(rate & RATE_MCS_HT_MSK) &&
3496 !(rate & RATE_MCS_VHT_MSK)) {
3497 int index = iwl_hwrate_to_plcp_idx(rate);
3498
3499 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3500 rs_pretty_ant(ant),
3501 index == IWL_RATE_INVALID ? "BAD" :
3502 iwl_rate_mcs[index].mbps);
3503 }
3504
3505 if (rate & RATE_MCS_VHT_MSK) {
3506 type = "VHT";
3507 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3508 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3509 >> RATE_VHT_MCS_NSS_POS) + 1;
3510 } else if (rate & RATE_MCS_HT_MSK) {
3511 type = "HT";
3512 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3513 } else {
3514 type = "Unknown"; /* shouldn't happen */
3515 }
3516
3517 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3518 case RATE_MCS_CHAN_WIDTH_20:
3519 bw = "20Mhz";
3520 break;
3521 case RATE_MCS_CHAN_WIDTH_40:
3522 bw = "40Mhz";
3523 break;
3524 case RATE_MCS_CHAN_WIDTH_80:
3525 bw = "80Mhz";
3526 break;
3527 case RATE_MCS_CHAN_WIDTH_160:
3528 bw = "160Mhz";
3529 break;
3530 default:
3531 bw = "BAD BW";
3532 }
3533
3534 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3535 type, rs_pretty_ant(ant), bw, mcs, nss,
3536 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3537 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3538 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3539 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3540 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3541 }
3542
3543 /**
3544 * Program the device to use fixed rate for frame transmit
3545 * This is for debugging/testing only
3546 * once the device start use fixed rate, we need to reload the module
3547 * to being back the normal operation.
3548 */
3549 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3550 struct iwl_lq_sta *lq_sta)
3551 {
3552 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3553 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3554 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3555
3556 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3557 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3558
3559 if (lq_sta->pers.dbg_fixed_rate) {
3560 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3561 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3562 }
3563 }
3564
3565 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3566 const char __user *user_buf, size_t count, loff_t *ppos)
3567 {
3568 struct iwl_lq_sta *lq_sta = file->private_data;
3569 struct iwl_mvm *mvm;
3570 char buf[64];
3571 size_t buf_size;
3572 u32 parsed_rate;
3573
3574 mvm = lq_sta->pers.drv;
3575 memset(buf, 0, sizeof(buf));
3576 buf_size = min(count, sizeof(buf) - 1);
3577 if (copy_from_user(buf, user_buf, buf_size))
3578 return -EFAULT;
3579
3580 if (sscanf(buf, "%x", &parsed_rate) == 1)
3581 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3582 else
3583 lq_sta->pers.dbg_fixed_rate = 0;
3584
3585 rs_program_fix_rate(mvm, lq_sta);
3586
3587 return count;
3588 }
3589
3590 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3591 char __user *user_buf, size_t count, loff_t *ppos)
3592 {
3593 char *buff;
3594 int desc = 0;
3595 int i = 0;
3596 ssize_t ret;
3597
3598 struct iwl_lq_sta *lq_sta = file->private_data;
3599 struct iwl_mvm *mvm;
3600 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3601 struct rs_rate *rate = &tbl->rate;
3602 u32 ss_params;
3603 mvm = lq_sta->pers.drv;
3604 buff = kmalloc(2048, GFP_KERNEL);
3605 if (!buff)
3606 return -ENOMEM;
3607
3608 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3609 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3610 lq_sta->total_failed, lq_sta->total_success,
3611 lq_sta->active_legacy_rate);
3612 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3613 lq_sta->pers.dbg_fixed_rate);
3614 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3615 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3616 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3617 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3618 desc += sprintf(buff+desc, "lq type %s\n",
3619 (is_legacy(rate)) ? "legacy" :
3620 is_vht(rate) ? "VHT" : "HT");
3621 if (!is_legacy(rate)) {
3622 desc += sprintf(buff + desc, " %s",
3623 (is_siso(rate)) ? "SISO" : "MIMO2");
3624 desc += sprintf(buff + desc, " %s",
3625 (is_ht20(rate)) ? "20MHz" :
3626 (is_ht40(rate)) ? "40MHz" :
3627 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3628 desc += sprintf(buff + desc, " %s %s %s\n",
3629 (rate->sgi) ? "SGI" : "NGI",
3630 (rate->ldpc) ? "LDPC" : "BCC",
3631 (lq_sta->is_agg) ? "AGG on" : "");
3632 }
3633 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3634 lq_sta->last_rate_n_flags);
3635 desc += sprintf(buff+desc,
3636 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3637 lq_sta->lq.flags,
3638 lq_sta->lq.mimo_delim,
3639 lq_sta->lq.single_stream_ant_msk,
3640 lq_sta->lq.dual_stream_ant_msk);
3641
3642 desc += sprintf(buff+desc,
3643 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3644 le16_to_cpu(lq_sta->lq.agg_time_limit),
3645 lq_sta->lq.agg_disable_start_th,
3646 lq_sta->lq.agg_frame_cnt_limit);
3647
3648 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3649 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3650 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3651 (ss_params & LQ_SS_PARAMS_VALID) ?
3652 "VALID" : "INVALID",
3653 (ss_params & LQ_SS_BFER_ALLOWED) ?
3654 ", BFER" : "",
3655 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3656 ", STBC" : "",
3657 (ss_params & LQ_SS_FORCE) ?
3658 ", FORCE" : "");
3659 desc += sprintf(buff+desc,
3660 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3661 lq_sta->lq.initial_rate_index[0],
3662 lq_sta->lq.initial_rate_index[1],
3663 lq_sta->lq.initial_rate_index[2],
3664 lq_sta->lq.initial_rate_index[3]);
3665
3666 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3667 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3668
3669 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3670 desc += rs_pretty_print_rate(buff+desc, r);
3671 }
3672
3673 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3674 kfree(buff);
3675 return ret;
3676 }
3677
3678 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3679 .write = rs_sta_dbgfs_scale_table_write,
3680 .read = rs_sta_dbgfs_scale_table_read,
3681 .open = simple_open,
3682 .llseek = default_llseek,
3683 };
3684 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3685 char __user *user_buf, size_t count, loff_t *ppos)
3686 {
3687 char *buff;
3688 int desc = 0;
3689 int i, j;
3690 ssize_t ret;
3691 struct iwl_scale_tbl_info *tbl;
3692 struct rs_rate *rate;
3693 struct iwl_lq_sta *lq_sta = file->private_data;
3694
3695 buff = kmalloc(1024, GFP_KERNEL);
3696 if (!buff)
3697 return -ENOMEM;
3698
3699 for (i = 0; i < LQ_SIZE; i++) {
3700 tbl = &(lq_sta->lq_info[i]);
3701 rate = &tbl->rate;
3702 desc += sprintf(buff+desc,
3703 "%s type=%d SGI=%d BW=%s DUP=0\n"
3704 "index=%d\n",
3705 lq_sta->active_tbl == i ? "*" : "x",
3706 rate->type,
3707 rate->sgi,
3708 is_ht20(rate) ? "20Mhz" :
3709 is_ht40(rate) ? "40Mhz" :
3710 is_ht80(rate) ? "80Mhz" : "ERR",
3711 rate->index);
3712 for (j = 0; j < IWL_RATE_COUNT; j++) {
3713 desc += sprintf(buff+desc,
3714 "counter=%d success=%d %%=%d\n",
3715 tbl->win[j].counter,
3716 tbl->win[j].success_counter,
3717 tbl->win[j].success_ratio);
3718 }
3719 }
3720 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3721 kfree(buff);
3722 return ret;
3723 }
3724
3725 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3726 .read = rs_sta_dbgfs_stats_table_read,
3727 .open = simple_open,
3728 .llseek = default_llseek,
3729 };
3730
3731 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3732 char __user *user_buf,
3733 size_t count, loff_t *ppos)
3734 {
3735 static const char * const column_name[] = {
3736 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3737 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3738 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3739 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3740 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3741 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3742 [RS_COLUMN_MIMO2] = "MIMO2",
3743 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3744 };
3745
3746 static const char * const rate_name[] = {
3747 [IWL_RATE_1M_INDEX] = "1M",
3748 [IWL_RATE_2M_INDEX] = "2M",
3749 [IWL_RATE_5M_INDEX] = "5.5M",
3750 [IWL_RATE_11M_INDEX] = "11M",
3751 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3752 [IWL_RATE_9M_INDEX] = "9M",
3753 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3754 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3755 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3756 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3757 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3758 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3759 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3760 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3761 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3762 };
3763
3764 char *buff, *pos, *endpos;
3765 int col, rate;
3766 ssize_t ret;
3767 struct iwl_lq_sta *lq_sta = file->private_data;
3768 struct rs_rate_stats *stats;
3769 static const size_t bufsz = 1024;
3770
3771 buff = kmalloc(bufsz, GFP_KERNEL);
3772 if (!buff)
3773 return -ENOMEM;
3774
3775 pos = buff;
3776 endpos = pos + bufsz;
3777
3778 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3779 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3780 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3781 pos += scnprintf(pos, endpos - pos, "\n");
3782
3783 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3784 pos += scnprintf(pos, endpos - pos,
3785 "%s,", column_name[col]);
3786
3787 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3788 stats = &(lq_sta->pers.tx_stats[col][rate]);
3789 pos += scnprintf(pos, endpos - pos,
3790 "%llu/%llu,",
3791 stats->success,
3792 stats->total);
3793 }
3794 pos += scnprintf(pos, endpos - pos, "\n");
3795 }
3796
3797 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3798 kfree(buff);
3799 return ret;
3800 }
3801
3802 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3803 const char __user *user_buf,
3804 size_t count, loff_t *ppos)
3805 {
3806 struct iwl_lq_sta *lq_sta = file->private_data;
3807 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3808
3809 return count;
3810 }
3811
3812 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3813 .read = rs_sta_dbgfs_drv_tx_stats_read,
3814 .write = rs_sta_dbgfs_drv_tx_stats_write,
3815 .open = simple_open,
3816 .llseek = default_llseek,
3817 };
3818
3819 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3820 char __user *user_buf,
3821 size_t count, loff_t *ppos)
3822 {
3823 struct iwl_lq_sta *lq_sta = file->private_data;
3824 char buf[12];
3825 int bufsz = sizeof(buf);
3826 int pos = 0;
3827 static const char * const ss_force_name[] = {
3828 [RS_SS_FORCE_NONE] = "none",
3829 [RS_SS_FORCE_STBC] = "stbc",
3830 [RS_SS_FORCE_BFER] = "bfer",
3831 [RS_SS_FORCE_SISO] = "siso",
3832 };
3833
3834 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3835 ss_force_name[lq_sta->pers.ss_force]);
3836 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3837 }
3838
3839 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3840 size_t count, loff_t *ppos)
3841 {
3842 struct iwl_mvm *mvm = lq_sta->pers.drv;
3843 int ret = 0;
3844
3845 if (!strncmp("none", buf, 4)) {
3846 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3847 } else if (!strncmp("siso", buf, 4)) {
3848 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3849 } else if (!strncmp("stbc", buf, 4)) {
3850 if (lq_sta->stbc_capable) {
3851 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3852 } else {
3853 IWL_ERR(mvm,
3854 "can't force STBC. peer doesn't support\n");
3855 ret = -EINVAL;
3856 }
3857 } else if (!strncmp("bfer", buf, 4)) {
3858 if (lq_sta->bfer_capable) {
3859 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3860 } else {
3861 IWL_ERR(mvm,
3862 "can't force BFER. peer doesn't support\n");
3863 ret = -EINVAL;
3864 }
3865 } else {
3866 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3867 ret = -EINVAL;
3868 }
3869 return ret ?: count;
3870 }
3871
3872 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3873 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3874 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3875 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3876 &iwl_dbgfs_##name##_ops)) \
3877 goto err; \
3878 } while (0)
3879
3880 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3881
3882 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3883 {
3884 struct iwl_lq_sta *lq_sta = priv_sta;
3885 struct iwl_mvm_sta *mvmsta;
3886
3887 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3888
3889 if (!mvmsta->vif)
3890 return;
3891
3892 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3893 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3894 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3895 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3896 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3897 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3898 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3899 &lq_sta->tx_agg_tid_en);
3900 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3901 &lq_sta->pers.dbg_fixed_txp_reduction);
3902
3903 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3904 return;
3905 err:
3906 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3907 }
3908
3909 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3910 {
3911 }
3912 #endif
3913
3914 /*
3915 * Initialization of rate scaling information is done by driver after
3916 * the station is added. Since mac80211 calls this function before a
3917 * station is added we ignore it.
3918 */
3919 static void rs_rate_init_stub(void *mvm_r,
3920 struct ieee80211_supported_band *sband,
3921 struct cfg80211_chan_def *chandef,
3922 struct ieee80211_sta *sta, void *mvm_sta)
3923 {
3924 }
3925
3926 static const struct rate_control_ops rs_mvm_ops = {
3927 .name = RS_NAME,
3928 .tx_status = rs_mac80211_tx_status,
3929 .get_rate = rs_get_rate,
3930 .rate_init = rs_rate_init_stub,
3931 .alloc = rs_alloc,
3932 .free = rs_free,
3933 .alloc_sta = rs_alloc_sta,
3934 .free_sta = rs_free_sta,
3935 .rate_update = rs_rate_update,
3936 #ifdef CONFIG_MAC80211_DEBUGFS
3937 .add_sta_debugfs = rs_add_debugfs,
3938 .remove_sta_debugfs = rs_remove_debugfs,
3939 #endif
3940 };
3941
3942 int iwl_mvm_rate_control_register(void)
3943 {
3944 return ieee80211_rate_control_register(&rs_mvm_ops);
3945 }
3946
3947 void iwl_mvm_rate_control_unregister(void)
3948 {
3949 ieee80211_rate_control_unregister(&rs_mvm_ops);
3950 }
3951
3952 /**
3953 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3954 * Tx protection, according to this request and previous requests,
3955 * and send the LQ command.
3956 * @mvmsta: The station
3957 * @enable: Enable Tx protection?
3958 */
3959 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3960 bool enable)
3961 {
3962 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3963
3964 lockdep_assert_held(&mvm->mutex);
3965
3966 if (enable) {
3967 if (mvmsta->tx_protection == 0)
3968 lq->flags |= LQ_FLAG_USE_RTS_MSK;
3969 mvmsta->tx_protection++;
3970 } else {
3971 mvmsta->tx_protection--;
3972 if (mvmsta->tx_protection == 0)
3973 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3974 }
3975
3976 return iwl_mvm_send_lq_cmd(mvm, lq, false);
3977 }
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