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[mirror_ubuntu-bionic-kernel.git] / drivers / net / wireless / 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 if (IWL_MVM_RS_DISABLE_P2P_MIMO &&
181 iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p)
182 return false;
183
184 if (mvm->nvm_data->sku_cap_mimo_disabled)
185 return false;
186
187 return true;
188 }
189
190 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
191 struct rs_rate *rate,
192 const struct rs_tx_column *next_col)
193 {
194 if (!sta->ht_cap.ht_supported)
195 return false;
196
197 return true;
198 }
199
200 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
201 struct rs_rate *rate,
202 const struct rs_tx_column *next_col)
203 {
204 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
205 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
206
207 if (is_ht20(rate) && (ht_cap->cap &
208 IEEE80211_HT_CAP_SGI_20))
209 return true;
210 if (is_ht40(rate) && (ht_cap->cap &
211 IEEE80211_HT_CAP_SGI_40))
212 return true;
213 if (is_ht80(rate) && (vht_cap->cap &
214 IEEE80211_VHT_CAP_SHORT_GI_80))
215 return true;
216
217 return false;
218 }
219
220 static const struct rs_tx_column rs_tx_columns[] = {
221 [RS_COLUMN_LEGACY_ANT_A] = {
222 .mode = RS_LEGACY,
223 .ant = ANT_A,
224 .next_columns = {
225 RS_COLUMN_LEGACY_ANT_B,
226 RS_COLUMN_SISO_ANT_A,
227 RS_COLUMN_MIMO2,
228 RS_COLUMN_INVALID,
229 RS_COLUMN_INVALID,
230 RS_COLUMN_INVALID,
231 RS_COLUMN_INVALID,
232 },
233 .checks = {
234 rs_ant_allow,
235 },
236 },
237 [RS_COLUMN_LEGACY_ANT_B] = {
238 .mode = RS_LEGACY,
239 .ant = ANT_B,
240 .next_columns = {
241 RS_COLUMN_LEGACY_ANT_A,
242 RS_COLUMN_SISO_ANT_B,
243 RS_COLUMN_MIMO2,
244 RS_COLUMN_INVALID,
245 RS_COLUMN_INVALID,
246 RS_COLUMN_INVALID,
247 RS_COLUMN_INVALID,
248 },
249 .checks = {
250 rs_ant_allow,
251 },
252 },
253 [RS_COLUMN_SISO_ANT_A] = {
254 .mode = RS_SISO,
255 .ant = ANT_A,
256 .next_columns = {
257 RS_COLUMN_SISO_ANT_B,
258 RS_COLUMN_MIMO2,
259 RS_COLUMN_SISO_ANT_A_SGI,
260 RS_COLUMN_LEGACY_ANT_A,
261 RS_COLUMN_LEGACY_ANT_B,
262 RS_COLUMN_INVALID,
263 RS_COLUMN_INVALID,
264 },
265 .checks = {
266 rs_siso_allow,
267 rs_ant_allow,
268 },
269 },
270 [RS_COLUMN_SISO_ANT_B] = {
271 .mode = RS_SISO,
272 .ant = ANT_B,
273 .next_columns = {
274 RS_COLUMN_SISO_ANT_A,
275 RS_COLUMN_MIMO2,
276 RS_COLUMN_SISO_ANT_B_SGI,
277 RS_COLUMN_LEGACY_ANT_A,
278 RS_COLUMN_LEGACY_ANT_B,
279 RS_COLUMN_INVALID,
280 RS_COLUMN_INVALID,
281 },
282 .checks = {
283 rs_siso_allow,
284 rs_ant_allow,
285 },
286 },
287 [RS_COLUMN_SISO_ANT_A_SGI] = {
288 .mode = RS_SISO,
289 .ant = ANT_A,
290 .sgi = true,
291 .next_columns = {
292 RS_COLUMN_SISO_ANT_B_SGI,
293 RS_COLUMN_MIMO2_SGI,
294 RS_COLUMN_SISO_ANT_A,
295 RS_COLUMN_LEGACY_ANT_A,
296 RS_COLUMN_LEGACY_ANT_B,
297 RS_COLUMN_INVALID,
298 RS_COLUMN_INVALID,
299 },
300 .checks = {
301 rs_siso_allow,
302 rs_ant_allow,
303 rs_sgi_allow,
304 },
305 },
306 [RS_COLUMN_SISO_ANT_B_SGI] = {
307 .mode = RS_SISO,
308 .ant = ANT_B,
309 .sgi = true,
310 .next_columns = {
311 RS_COLUMN_SISO_ANT_A_SGI,
312 RS_COLUMN_MIMO2_SGI,
313 RS_COLUMN_SISO_ANT_B,
314 RS_COLUMN_LEGACY_ANT_A,
315 RS_COLUMN_LEGACY_ANT_B,
316 RS_COLUMN_INVALID,
317 RS_COLUMN_INVALID,
318 },
319 .checks = {
320 rs_siso_allow,
321 rs_ant_allow,
322 rs_sgi_allow,
323 },
324 },
325 [RS_COLUMN_MIMO2] = {
326 .mode = RS_MIMO2,
327 .ant = ANT_AB,
328 .next_columns = {
329 RS_COLUMN_SISO_ANT_A,
330 RS_COLUMN_MIMO2_SGI,
331 RS_COLUMN_LEGACY_ANT_A,
332 RS_COLUMN_LEGACY_ANT_B,
333 RS_COLUMN_INVALID,
334 RS_COLUMN_INVALID,
335 RS_COLUMN_INVALID,
336 },
337 .checks = {
338 rs_mimo_allow,
339 },
340 },
341 [RS_COLUMN_MIMO2_SGI] = {
342 .mode = RS_MIMO2,
343 .ant = ANT_AB,
344 .sgi = true,
345 .next_columns = {
346 RS_COLUMN_SISO_ANT_A_SGI,
347 RS_COLUMN_MIMO2,
348 RS_COLUMN_LEGACY_ANT_A,
349 RS_COLUMN_LEGACY_ANT_B,
350 RS_COLUMN_INVALID,
351 RS_COLUMN_INVALID,
352 RS_COLUMN_INVALID,
353 },
354 .checks = {
355 rs_mimo_allow,
356 rs_sgi_allow,
357 },
358 },
359 };
360
361 static inline u8 rs_extract_rate(u32 rate_n_flags)
362 {
363 /* also works for HT because bits 7:6 are zero there */
364 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
365 }
366
367 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
368 {
369 int idx = 0;
370
371 if (rate_n_flags & RATE_MCS_HT_MSK) {
372 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
373 idx += IWL_RATE_MCS_0_INDEX;
374
375 /* skip 9M not supported in HT*/
376 if (idx >= IWL_RATE_9M_INDEX)
377 idx += 1;
378 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
379 return idx;
380 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
381 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
382 idx += IWL_RATE_MCS_0_INDEX;
383
384 /* skip 9M not supported in VHT*/
385 if (idx >= IWL_RATE_9M_INDEX)
386 idx++;
387 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
388 return idx;
389 } else {
390 /* legacy rate format, search for match in table */
391
392 u8 legacy_rate = rs_extract_rate(rate_n_flags);
393 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
394 if (iwl_rates[idx].plcp == legacy_rate)
395 return idx;
396 }
397
398 return IWL_RATE_INVALID;
399 }
400
401 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
402 struct ieee80211_sta *sta,
403 struct iwl_lq_sta *lq_sta,
404 int tid);
405 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
406 struct ieee80211_sta *sta,
407 struct iwl_lq_sta *lq_sta,
408 const struct rs_rate *initial_rate);
409 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
410
411 /**
412 * The following tables contain the expected throughput metrics for all rates
413 *
414 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
415 *
416 * where invalid entries are zeros.
417 *
418 * CCK rates are only valid in legacy table and will only be used in G
419 * (2.4 GHz) band.
420 */
421
422 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
423 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
424 };
425
426 /* Expected TpT tables. 4 indexes:
427 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
428 */
429 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
430 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
431 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
432 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
433 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
434 };
435
436 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
437 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
438 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
439 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
440 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
441 };
442
443 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
444 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
445 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
446 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
447 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
448 };
449
450 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
451 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
452 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
453 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
454 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
455 };
456
457 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
458 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
459 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
460 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
461 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
462 };
463
464 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
465 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
466 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
467 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
468 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
469 };
470
471 /* mbps, mcs */
472 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
473 { "1", "BPSK DSSS"},
474 { "2", "QPSK DSSS"},
475 {"5.5", "BPSK CCK"},
476 { "11", "QPSK CCK"},
477 { "6", "BPSK 1/2"},
478 { "9", "BPSK 1/2"},
479 { "12", "QPSK 1/2"},
480 { "18", "QPSK 3/4"},
481 { "24", "16QAM 1/2"},
482 { "36", "16QAM 3/4"},
483 { "48", "64QAM 2/3"},
484 { "54", "64QAM 3/4"},
485 { "60", "64QAM 5/6"},
486 };
487
488 #define MCS_INDEX_PER_STREAM (8)
489
490 static const char *rs_pretty_ant(u8 ant)
491 {
492 static const char * const ant_name[] = {
493 [ANT_NONE] = "None",
494 [ANT_A] = "A",
495 [ANT_B] = "B",
496 [ANT_AB] = "AB",
497 [ANT_C] = "C",
498 [ANT_AC] = "AC",
499 [ANT_BC] = "BC",
500 [ANT_ABC] = "ABC",
501 };
502
503 if (ant > ANT_ABC)
504 return "UNKNOWN";
505
506 return ant_name[ant];
507 }
508
509 static const char *rs_pretty_lq_type(enum iwl_table_type type)
510 {
511 static const char * const lq_types[] = {
512 [LQ_NONE] = "NONE",
513 [LQ_LEGACY_A] = "LEGACY_A",
514 [LQ_LEGACY_G] = "LEGACY_G",
515 [LQ_HT_SISO] = "HT SISO",
516 [LQ_HT_MIMO2] = "HT MIMO",
517 [LQ_VHT_SISO] = "VHT SISO",
518 [LQ_VHT_MIMO2] = "VHT MIMO",
519 };
520
521 if (type < LQ_NONE || type >= LQ_MAX)
522 return "UNKNOWN";
523
524 return lq_types[type];
525 }
526
527 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
528 const char *prefix)
529 {
530 IWL_DEBUG_RATE(mvm,
531 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
532 prefix, rs_pretty_lq_type(rate->type),
533 rate->index, rs_pretty_ant(rate->ant),
534 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
535 }
536
537 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
538 {
539 window->data = 0;
540 window->success_counter = 0;
541 window->success_ratio = IWL_INVALID_VALUE;
542 window->counter = 0;
543 window->average_tpt = IWL_INVALID_VALUE;
544 }
545
546 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
547 struct iwl_scale_tbl_info *tbl)
548 {
549 int i;
550
551 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
552 for (i = 0; i < IWL_RATE_COUNT; i++)
553 rs_rate_scale_clear_window(&tbl->win[i]);
554
555 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
556 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
557 }
558
559 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
560 {
561 return (ant_type & valid_antenna) == ant_type;
562 }
563
564 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
565 struct iwl_lq_sta *lq_data, u8 tid,
566 struct ieee80211_sta *sta)
567 {
568 int ret = -EAGAIN;
569
570 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
571 sta->addr, tid);
572 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
573 if (ret == -EAGAIN) {
574 /*
575 * driver and mac80211 is out of sync
576 * this might be cause by reloading firmware
577 * stop the tx ba session here
578 */
579 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
580 tid);
581 ieee80211_stop_tx_ba_session(sta, tid);
582 }
583 return ret;
584 }
585
586 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
587 struct iwl_lq_sta *lq_data,
588 struct ieee80211_sta *sta)
589 {
590 if (tid < IWL_MAX_TID_COUNT)
591 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
592 else
593 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
594 tid, IWL_MAX_TID_COUNT);
595 }
596
597 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
598 {
599 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
600 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
601 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
602 }
603
604 /*
605 * Static function to get the expected throughput from an iwl_scale_tbl_info
606 * that wraps a NULL pointer check
607 */
608 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
609 {
610 if (tbl->expected_tpt)
611 return tbl->expected_tpt[rs_index];
612 return 0;
613 }
614
615 /**
616 * rs_collect_tx_data - Update the success/failure sliding window
617 *
618 * We keep a sliding window of the last 62 packets transmitted
619 * at this rate. window->data contains the bitmask of successful
620 * packets.
621 */
622 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
623 struct iwl_scale_tbl_info *tbl,
624 int scale_index, int attempts, int successes,
625 struct iwl_rate_scale_data *window)
626 {
627 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
628 s32 fail_count, tpt;
629
630 /* Get expected throughput */
631 tpt = get_expected_tpt(tbl, scale_index);
632
633 /*
634 * Keep track of only the latest 62 tx frame attempts in this rate's
635 * history window; anything older isn't really relevant any more.
636 * If we have filled up the sliding window, drop the oldest attempt;
637 * if the oldest attempt (highest bit in bitmap) shows "success",
638 * subtract "1" from the success counter (this is the main reason
639 * we keep these bitmaps!).
640 */
641 while (attempts > 0) {
642 if (window->counter >= IWL_RATE_MAX_WINDOW) {
643 /* remove earliest */
644 window->counter = IWL_RATE_MAX_WINDOW - 1;
645
646 if (window->data & mask) {
647 window->data &= ~mask;
648 window->success_counter--;
649 }
650 }
651
652 /* Increment frames-attempted counter */
653 window->counter++;
654
655 /* Shift bitmap by one frame to throw away oldest history */
656 window->data <<= 1;
657
658 /* Mark the most recent #successes attempts as successful */
659 if (successes > 0) {
660 window->success_counter++;
661 window->data |= 0x1;
662 successes--;
663 }
664
665 attempts--;
666 }
667
668 /* Calculate current success ratio, avoid divide-by-0! */
669 if (window->counter > 0)
670 window->success_ratio = 128 * (100 * window->success_counter)
671 / window->counter;
672 else
673 window->success_ratio = IWL_INVALID_VALUE;
674
675 fail_count = window->counter - window->success_counter;
676
677 /* Calculate average throughput, if we have enough history. */
678 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
679 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
680 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
681 else
682 window->average_tpt = IWL_INVALID_VALUE;
683
684 return 0;
685 }
686
687 static int rs_collect_tx_data(struct iwl_mvm *mvm,
688 struct iwl_lq_sta *lq_sta,
689 struct iwl_scale_tbl_info *tbl,
690 int scale_index, int attempts, int successes,
691 u8 reduced_txp)
692 {
693 struct iwl_rate_scale_data *window = NULL;
694 int ret;
695
696 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
697 return -EINVAL;
698
699 if (tbl->column != RS_COLUMN_INVALID) {
700 struct lq_sta_pers *pers = &lq_sta->pers;
701
702 pers->tx_stats[tbl->column][scale_index].total += attempts;
703 pers->tx_stats[tbl->column][scale_index].success += successes;
704 }
705
706 /* Select window for current tx bit rate */
707 window = &(tbl->win[scale_index]);
708
709 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
710 window);
711 if (ret)
712 return ret;
713
714 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
715 return -EINVAL;
716
717 window = &tbl->tpc_win[reduced_txp];
718 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
719 window);
720 }
721
722 /* Convert rs_rate object into ucode rate bitmask */
723 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
724 struct rs_rate *rate)
725 {
726 u32 ucode_rate = 0;
727 int index = rate->index;
728
729 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
730 RATE_MCS_ANT_ABC_MSK);
731
732 if (is_legacy(rate)) {
733 ucode_rate |= iwl_rates[index].plcp;
734 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
735 ucode_rate |= RATE_MCS_CCK_MSK;
736 return ucode_rate;
737 }
738
739 if (is_ht(rate)) {
740 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
741 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
742 index = IWL_LAST_HT_RATE;
743 }
744 ucode_rate |= RATE_MCS_HT_MSK;
745
746 if (is_ht_siso(rate))
747 ucode_rate |= iwl_rates[index].plcp_ht_siso;
748 else if (is_ht_mimo2(rate))
749 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
750 else
751 WARN_ON_ONCE(1);
752 } else if (is_vht(rate)) {
753 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
754 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
755 index = IWL_LAST_VHT_RATE;
756 }
757 ucode_rate |= RATE_MCS_VHT_MSK;
758 if (is_vht_siso(rate))
759 ucode_rate |= iwl_rates[index].plcp_vht_siso;
760 else if (is_vht_mimo2(rate))
761 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
762 else
763 WARN_ON_ONCE(1);
764
765 } else {
766 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
767 }
768
769 if (is_siso(rate) && rate->stbc) {
770 /* To enable STBC we need to set both a flag and ANT_AB */
771 ucode_rate |= RATE_MCS_ANT_AB_MSK;
772 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
773 }
774
775 ucode_rate |= rate->bw;
776 if (rate->sgi)
777 ucode_rate |= RATE_MCS_SGI_MSK;
778 if (rate->ldpc)
779 ucode_rate |= RATE_MCS_LDPC_MSK;
780
781 return ucode_rate;
782 }
783
784 /* Convert a ucode rate into an rs_rate object */
785 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
786 enum ieee80211_band band,
787 struct rs_rate *rate)
788 {
789 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
790 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
791 u8 nss;
792
793 memset(rate, 0, sizeof(*rate));
794 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
795
796 if (rate->index == IWL_RATE_INVALID)
797 return -EINVAL;
798
799 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
800
801 /* Legacy */
802 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
803 !(ucode_rate & RATE_MCS_VHT_MSK)) {
804 if (num_of_ant == 1) {
805 if (band == IEEE80211_BAND_5GHZ)
806 rate->type = LQ_LEGACY_A;
807 else
808 rate->type = LQ_LEGACY_G;
809 }
810
811 return 0;
812 }
813
814 /* HT or VHT */
815 if (ucode_rate & RATE_MCS_SGI_MSK)
816 rate->sgi = true;
817 if (ucode_rate & RATE_MCS_LDPC_MSK)
818 rate->ldpc = true;
819 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
820 rate->stbc = true;
821 if (ucode_rate & RATE_MCS_BF_MSK)
822 rate->bfer = true;
823
824 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
825
826 if (ucode_rate & RATE_MCS_HT_MSK) {
827 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
828 RATE_HT_MCS_NSS_POS) + 1;
829
830 if (nss == 1) {
831 rate->type = LQ_HT_SISO;
832 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
833 "stbc %d bfer %d",
834 rate->stbc, rate->bfer);
835 } else if (nss == 2) {
836 rate->type = LQ_HT_MIMO2;
837 WARN_ON_ONCE(num_of_ant != 2);
838 } else {
839 WARN_ON_ONCE(1);
840 }
841 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
842 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
843 RATE_VHT_MCS_NSS_POS) + 1;
844
845 if (nss == 1) {
846 rate->type = LQ_VHT_SISO;
847 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
848 "stbc %d bfer %d",
849 rate->stbc, rate->bfer);
850 } else if (nss == 2) {
851 rate->type = LQ_VHT_MIMO2;
852 WARN_ON_ONCE(num_of_ant != 2);
853 } else {
854 WARN_ON_ONCE(1);
855 }
856 }
857
858 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
859 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
860 !is_vht(rate));
861
862 return 0;
863 }
864
865 /* switch to another antenna/antennas and return 1 */
866 /* if no other valid antenna found, return 0 */
867 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
868 {
869 u8 new_ant_type;
870
871 if (!rate->ant || rate->ant > ANT_ABC)
872 return 0;
873
874 if (!rs_is_valid_ant(valid_ant, rate->ant))
875 return 0;
876
877 new_ant_type = ant_toggle_lookup[rate->ant];
878
879 while ((new_ant_type != rate->ant) &&
880 !rs_is_valid_ant(valid_ant, new_ant_type))
881 new_ant_type = ant_toggle_lookup[new_ant_type];
882
883 if (new_ant_type == rate->ant)
884 return 0;
885
886 rate->ant = new_ant_type;
887
888 return 1;
889 }
890
891 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
892 struct rs_rate *rate)
893 {
894 if (is_legacy(rate))
895 return lq_sta->active_legacy_rate;
896 else if (is_siso(rate))
897 return lq_sta->active_siso_rate;
898 else if (is_mimo2(rate))
899 return lq_sta->active_mimo2_rate;
900
901 WARN_ON_ONCE(1);
902 return 0;
903 }
904
905 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
906 int rate_type)
907 {
908 u8 high = IWL_RATE_INVALID;
909 u8 low = IWL_RATE_INVALID;
910
911 /* 802.11A or ht walks to the next literal adjacent rate in
912 * the rate table */
913 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
914 int i;
915 u32 mask;
916
917 /* Find the previous rate that is in the rate mask */
918 i = index - 1;
919 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
920 if (rate_mask & mask) {
921 low = i;
922 break;
923 }
924 }
925
926 /* Find the next rate that is in the rate mask */
927 i = index + 1;
928 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
929 if (rate_mask & mask) {
930 high = i;
931 break;
932 }
933 }
934
935 return (high << 8) | low;
936 }
937
938 low = index;
939 while (low != IWL_RATE_INVALID) {
940 low = iwl_rates[low].prev_rs;
941 if (low == IWL_RATE_INVALID)
942 break;
943 if (rate_mask & (1 << low))
944 break;
945 }
946
947 high = index;
948 while (high != IWL_RATE_INVALID) {
949 high = iwl_rates[high].next_rs;
950 if (high == IWL_RATE_INVALID)
951 break;
952 if (rate_mask & (1 << high))
953 break;
954 }
955
956 return (high << 8) | low;
957 }
958
959 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
960 struct rs_rate *rate)
961 {
962 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
963 }
964
965 /* Get the next supported lower rate in the current column.
966 * Return true if bottom rate in the current column was reached
967 */
968 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
969 struct rs_rate *rate)
970 {
971 u8 low;
972 u16 high_low;
973 u16 rate_mask;
974 struct iwl_mvm *mvm = lq_sta->pers.drv;
975
976 rate_mask = rs_get_supported_rates(lq_sta, rate);
977 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
978 rate->type);
979 low = high_low & 0xff;
980
981 /* Bottom rate of column reached */
982 if (low == IWL_RATE_INVALID)
983 return true;
984
985 rate->index = low;
986 return false;
987 }
988
989 /* Get the next rate to use following a column downgrade */
990 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
991 struct rs_rate *rate)
992 {
993 struct iwl_mvm *mvm = lq_sta->pers.drv;
994
995 if (is_legacy(rate)) {
996 /* No column to downgrade from Legacy */
997 return;
998 } else if (is_siso(rate)) {
999 /* Downgrade to Legacy if we were in SISO */
1000 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1001 rate->type = LQ_LEGACY_A;
1002 else
1003 rate->type = LQ_LEGACY_G;
1004
1005 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1006
1007 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1008 rate->index > IWL_RATE_MCS_9_INDEX);
1009
1010 rate->index = rs_ht_to_legacy[rate->index];
1011 rate->ldpc = false;
1012 } else {
1013 /* Downgrade to SISO with same MCS if in MIMO */
1014 rate->type = is_vht_mimo2(rate) ?
1015 LQ_VHT_SISO : LQ_HT_SISO;
1016 }
1017
1018 if (num_of_ant(rate->ant) > 1)
1019 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1020
1021 /* Relevant in both switching to SISO or Legacy */
1022 rate->sgi = false;
1023
1024 if (!rs_rate_supported(lq_sta, rate))
1025 rs_get_lower_rate_in_column(lq_sta, rate);
1026 }
1027
1028 /* Check if both rates are identical
1029 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1030 * with a rate indicating STBC/BFER and ANT_AB.
1031 */
1032 static inline bool rs_rate_equal(struct rs_rate *a,
1033 struct rs_rate *b,
1034 bool allow_ant_mismatch)
1035
1036 {
1037 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1038 (a->bfer == b->bfer);
1039
1040 if (allow_ant_mismatch) {
1041 if (a->stbc || a->bfer) {
1042 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1043 a->stbc, a->bfer, a->ant);
1044 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1045 } else if (b->stbc || b->bfer) {
1046 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1047 b->stbc, b->bfer, b->ant);
1048 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1049 }
1050 }
1051
1052 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1053 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1054 }
1055
1056 /* Check if both rates share the same column */
1057 static inline bool rs_rate_column_match(struct rs_rate *a,
1058 struct rs_rate *b)
1059 {
1060 bool ant_match;
1061
1062 if (a->stbc || a->bfer)
1063 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1064 else
1065 ant_match = (a->ant == b->ant);
1066
1067 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1068 && ant_match;
1069 }
1070
1071 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1072 {
1073 if (is_legacy(rate)) {
1074 if (rate->ant == ANT_A)
1075 return RS_COLUMN_LEGACY_ANT_A;
1076
1077 if (rate->ant == ANT_B)
1078 return RS_COLUMN_LEGACY_ANT_B;
1079
1080 goto err;
1081 }
1082
1083 if (is_siso(rate)) {
1084 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1085 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1086 RS_COLUMN_SISO_ANT_A;
1087
1088 if (rate->ant == ANT_B)
1089 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1090 RS_COLUMN_SISO_ANT_B;
1091
1092 goto err;
1093 }
1094
1095 if (is_mimo(rate))
1096 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1097
1098 err:
1099 return RS_COLUMN_INVALID;
1100 }
1101
1102 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1103 {
1104 u8 tid = IWL_MAX_TID_COUNT;
1105
1106 if (ieee80211_is_data_qos(hdr->frame_control)) {
1107 u8 *qc = ieee80211_get_qos_ctl(hdr);
1108 tid = qc[0] & 0xf;
1109 }
1110
1111 if (unlikely(tid > IWL_MAX_TID_COUNT))
1112 tid = IWL_MAX_TID_COUNT;
1113
1114 return tid;
1115 }
1116
1117 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1118 int tid, struct ieee80211_tx_info *info)
1119 {
1120 int legacy_success;
1121 int retries;
1122 int i;
1123 struct iwl_lq_cmd *table;
1124 u32 lq_hwrate;
1125 struct rs_rate lq_rate, tx_resp_rate;
1126 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1127 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1128 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1129 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1130 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1131 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1132 IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1133
1134 /* Treat uninitialized rate scaling data same as non-existing. */
1135 if (!lq_sta) {
1136 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1137 return;
1138 } else if (!lq_sta->pers.drv) {
1139 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1140 return;
1141 }
1142
1143 /* This packet was aggregated but doesn't carry status info */
1144 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1145 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1146 return;
1147
1148 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1149
1150 #ifdef CONFIG_MAC80211_DEBUGFS
1151 /* Disable last tx check if we are debugging with fixed rate but
1152 * update tx stats */
1153 if (lq_sta->pers.dbg_fixed_rate) {
1154 int index = tx_resp_rate.index;
1155 enum rs_column column;
1156 int attempts, success;
1157
1158 column = rs_get_column_from_rate(&tx_resp_rate);
1159 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1160 "Can't map rate 0x%x to column",
1161 tx_resp_hwrate))
1162 return;
1163
1164 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1165 attempts = info->status.ampdu_len;
1166 success = info->status.ampdu_ack_len;
1167 } else {
1168 attempts = info->status.rates[0].count;
1169 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1170 }
1171
1172 lq_sta->pers.tx_stats[column][index].total += attempts;
1173 lq_sta->pers.tx_stats[column][index].success += success;
1174
1175 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1176 tx_resp_hwrate, success, attempts);
1177 return;
1178 }
1179 #endif
1180
1181 if (time_after(jiffies,
1182 (unsigned long)(lq_sta->last_tx +
1183 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1184 int t;
1185
1186 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1187 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1188 ieee80211_stop_tx_ba_session(sta, t);
1189
1190 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1191 return;
1192 }
1193 lq_sta->last_tx = jiffies;
1194
1195 /* Ignore this Tx frame response if its initial rate doesn't match
1196 * that of latest Link Quality command. There may be stragglers
1197 * from a previous Link Quality command, but we're no longer interested
1198 * in those; they're either from the "active" mode while we're trying
1199 * to check "search" mode, or a prior "search" mode after we've moved
1200 * to a new "search" mode (which might become the new "active" mode).
1201 */
1202 table = &lq_sta->lq;
1203 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1204 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1205
1206 /* Here we actually compare this rate to the latest LQ command */
1207 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1208 IWL_DEBUG_RATE(mvm,
1209 "initial tx resp rate 0x%x does not match 0x%x\n",
1210 tx_resp_hwrate, lq_hwrate);
1211
1212 /*
1213 * Since rates mis-match, the last LQ command may have failed.
1214 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1215 * ... driver.
1216 */
1217 lq_sta->missed_rate_counter++;
1218 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1219 lq_sta->missed_rate_counter = 0;
1220 IWL_DEBUG_RATE(mvm,
1221 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1222 lq_sta->rs_state);
1223 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1224 }
1225 /* Regardless, ignore this status info for outdated rate */
1226 return;
1227 } else
1228 /* Rate did match, so reset the missed_rate_counter */
1229 lq_sta->missed_rate_counter = 0;
1230
1231 if (!lq_sta->search_better_tbl) {
1232 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1233 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1234 } else {
1235 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1236 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1237 }
1238
1239 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1240 IWL_DEBUG_RATE(mvm,
1241 "Neither active nor search matches tx rate\n");
1242 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1243 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1244 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1245 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1246 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1247
1248 /*
1249 * no matching table found, let's by-pass the data collection
1250 * and continue to perform rate scale to find the rate table
1251 */
1252 rs_stay_in_table(lq_sta, true);
1253 goto done;
1254 }
1255
1256 /*
1257 * Updating the frame history depends on whether packets were
1258 * aggregated.
1259 *
1260 * For aggregation, all packets were transmitted at the same rate, the
1261 * first index into rate scale table.
1262 */
1263 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1264 /* ampdu_ack_len = 0 marks no BA was received. In this case
1265 * treat it as a single frame loss as we don't want the success
1266 * ratio to dip too quickly because a BA wasn't received
1267 */
1268 if (info->status.ampdu_ack_len == 0)
1269 info->status.ampdu_len = 1;
1270
1271 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1272 info->status.ampdu_len,
1273 info->status.ampdu_ack_len,
1274 reduced_txp);
1275
1276 /* Update success/fail counts if not searching for new mode */
1277 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1278 lq_sta->total_success += info->status.ampdu_ack_len;
1279 lq_sta->total_failed += (info->status.ampdu_len -
1280 info->status.ampdu_ack_len);
1281 }
1282 } else {
1283 /* For legacy, update frame history with for each Tx retry. */
1284 retries = info->status.rates[0].count - 1;
1285 /* HW doesn't send more than 15 retries */
1286 retries = min(retries, 15);
1287
1288 /* The last transmission may have been successful */
1289 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1290 /* Collect data for each rate used during failed TX attempts */
1291 for (i = 0; i <= retries; ++i) {
1292 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1293 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1294 &lq_rate);
1295 /*
1296 * Only collect stats if retried rate is in the same RS
1297 * table as active/search.
1298 */
1299 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1300 tmp_tbl = curr_tbl;
1301 else if (rs_rate_column_match(&lq_rate,
1302 &other_tbl->rate))
1303 tmp_tbl = other_tbl;
1304 else
1305 continue;
1306
1307 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1308 1, i < retries ? 0 : legacy_success,
1309 reduced_txp);
1310 }
1311
1312 /* Update success/fail counts if not searching for new mode */
1313 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1314 lq_sta->total_success += legacy_success;
1315 lq_sta->total_failed += retries + (1 - legacy_success);
1316 }
1317 }
1318 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1319 lq_sta->last_rate_n_flags = lq_hwrate;
1320 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1321 done:
1322 /* See if there's a better rate or modulation mode to try. */
1323 if (sta->supp_rates[info->band])
1324 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1325 }
1326
1327 /*
1328 * mac80211 sends us Tx status
1329 */
1330 static void rs_mac80211_tx_status(void *mvm_r,
1331 struct ieee80211_supported_band *sband,
1332 struct ieee80211_sta *sta, void *priv_sta,
1333 struct sk_buff *skb)
1334 {
1335 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1336 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1337 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1338 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1339
1340 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1341 return;
1342
1343 if (!ieee80211_is_data(hdr->frame_control) ||
1344 info->flags & IEEE80211_TX_CTL_NO_ACK)
1345 return;
1346
1347 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1348 }
1349
1350 /*
1351 * Begin a period of staying with a selected modulation mode.
1352 * Set "stay_in_tbl" flag to prevent any mode switches.
1353 * Set frame tx success limits according to legacy vs. high-throughput,
1354 * and reset overall (spanning all rates) tx success history statistics.
1355 * These control how long we stay using same modulation mode before
1356 * searching for a new mode.
1357 */
1358 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1359 struct iwl_lq_sta *lq_sta)
1360 {
1361 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1362 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1363 if (is_legacy) {
1364 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1365 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1366 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1367 } else {
1368 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1369 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1370 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1371 }
1372 lq_sta->table_count = 0;
1373 lq_sta->total_failed = 0;
1374 lq_sta->total_success = 0;
1375 lq_sta->flush_timer = jiffies;
1376 lq_sta->visited_columns = 0;
1377 }
1378
1379 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1380 {
1381 if (rate_mask)
1382 return find_last_bit(&rate_mask, BITS_PER_LONG);
1383 return IWL_RATE_INVALID;
1384 }
1385
1386 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1387 const struct rs_tx_column *column)
1388 {
1389 switch (column->mode) {
1390 case RS_LEGACY:
1391 return lq_sta->max_legacy_rate_idx;
1392 case RS_SISO:
1393 return lq_sta->max_siso_rate_idx;
1394 case RS_MIMO2:
1395 return lq_sta->max_mimo2_rate_idx;
1396 default:
1397 WARN_ON_ONCE(1);
1398 }
1399
1400 return lq_sta->max_legacy_rate_idx;
1401 }
1402
1403 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1404 const struct rs_tx_column *column,
1405 u32 bw)
1406 {
1407 /* Used to choose among HT tables */
1408 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1409
1410 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1411 column->mode != RS_SISO &&
1412 column->mode != RS_MIMO2))
1413 return expected_tpt_legacy;
1414
1415 /* Legacy rates have only one table */
1416 if (column->mode == RS_LEGACY)
1417 return expected_tpt_legacy;
1418
1419 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1420 /* Choose among many HT tables depending on number of streams
1421 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1422 * status */
1423 if (column->mode == RS_SISO) {
1424 switch (bw) {
1425 case RATE_MCS_CHAN_WIDTH_20:
1426 ht_tbl_pointer = expected_tpt_siso_20MHz;
1427 break;
1428 case RATE_MCS_CHAN_WIDTH_40:
1429 ht_tbl_pointer = expected_tpt_siso_40MHz;
1430 break;
1431 case RATE_MCS_CHAN_WIDTH_80:
1432 ht_tbl_pointer = expected_tpt_siso_80MHz;
1433 break;
1434 default:
1435 WARN_ON_ONCE(1);
1436 }
1437 } else if (column->mode == RS_MIMO2) {
1438 switch (bw) {
1439 case RATE_MCS_CHAN_WIDTH_20:
1440 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1441 break;
1442 case RATE_MCS_CHAN_WIDTH_40:
1443 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1444 break;
1445 case RATE_MCS_CHAN_WIDTH_80:
1446 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1447 break;
1448 default:
1449 WARN_ON_ONCE(1);
1450 }
1451 } else {
1452 WARN_ON_ONCE(1);
1453 }
1454
1455 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1456 return ht_tbl_pointer[0];
1457 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1458 return ht_tbl_pointer[1];
1459 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1460 return ht_tbl_pointer[2];
1461 else /* AGG+SGI */
1462 return ht_tbl_pointer[3];
1463 }
1464
1465 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1466 struct iwl_scale_tbl_info *tbl)
1467 {
1468 struct rs_rate *rate = &tbl->rate;
1469 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1470
1471 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1472 }
1473
1474 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1475 struct iwl_lq_sta *lq_sta,
1476 struct iwl_scale_tbl_info *tbl, /* "search" */
1477 unsigned long rate_mask, s8 index)
1478 {
1479 struct iwl_scale_tbl_info *active_tbl =
1480 &(lq_sta->lq_info[lq_sta->active_tbl]);
1481 s32 success_ratio = active_tbl->win[index].success_ratio;
1482 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1483 const u16 *tpt_tbl = tbl->expected_tpt;
1484 u16 high_low;
1485 u32 target_tpt;
1486 int rate_idx;
1487
1488 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1489 target_tpt = 100 * expected_current_tpt;
1490 IWL_DEBUG_RATE(mvm,
1491 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1492 success_ratio, target_tpt);
1493 } else {
1494 target_tpt = lq_sta->last_tpt;
1495 IWL_DEBUG_RATE(mvm,
1496 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1497 success_ratio, target_tpt);
1498 }
1499
1500 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1501
1502 while (rate_idx != IWL_RATE_INVALID) {
1503 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1504 break;
1505
1506 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1507 tbl->rate.type);
1508
1509 rate_idx = (high_low >> 8) & 0xff;
1510 }
1511
1512 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1513 rate_idx, target_tpt,
1514 rate_idx != IWL_RATE_INVALID ?
1515 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1516
1517 return rate_idx;
1518 }
1519
1520 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1521 {
1522 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1523 return RATE_MCS_CHAN_WIDTH_80;
1524 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1525 return RATE_MCS_CHAN_WIDTH_40;
1526
1527 return RATE_MCS_CHAN_WIDTH_20;
1528 }
1529
1530 /*
1531 * Check whether we should continue using same modulation mode, or
1532 * begin search for a new mode, based on:
1533 * 1) # tx successes or failures while using this mode
1534 * 2) # times calling this function
1535 * 3) elapsed time in this mode (not used, for now)
1536 */
1537 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1538 {
1539 struct iwl_scale_tbl_info *tbl;
1540 int active_tbl;
1541 int flush_interval_passed = 0;
1542 struct iwl_mvm *mvm;
1543
1544 mvm = lq_sta->pers.drv;
1545 active_tbl = lq_sta->active_tbl;
1546
1547 tbl = &(lq_sta->lq_info[active_tbl]);
1548
1549 /* If we've been disallowing search, see if we should now allow it */
1550 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1551 /* Elapsed time using current modulation mode */
1552 if (lq_sta->flush_timer)
1553 flush_interval_passed =
1554 time_after(jiffies,
1555 (unsigned long)(lq_sta->flush_timer +
1556 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1557
1558 /*
1559 * Check if we should allow search for new modulation mode.
1560 * If many frames have failed or succeeded, or we've used
1561 * this same modulation for a long time, allow search, and
1562 * reset history stats that keep track of whether we should
1563 * allow a new search. Also (below) reset all bitmaps and
1564 * stats in active history.
1565 */
1566 if (force_search ||
1567 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1568 (lq_sta->total_success > lq_sta->max_success_limit) ||
1569 ((!lq_sta->search_better_tbl) &&
1570 (lq_sta->flush_timer) && (flush_interval_passed))) {
1571 IWL_DEBUG_RATE(mvm,
1572 "LQ: stay is expired %d %d %d\n",
1573 lq_sta->total_failed,
1574 lq_sta->total_success,
1575 flush_interval_passed);
1576
1577 /* Allow search for new mode */
1578 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1579 IWL_DEBUG_RATE(mvm,
1580 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1581 lq_sta->total_failed = 0;
1582 lq_sta->total_success = 0;
1583 lq_sta->flush_timer = 0;
1584 /* mark the current column as visited */
1585 lq_sta->visited_columns = BIT(tbl->column);
1586 /*
1587 * Else if we've used this modulation mode enough repetitions
1588 * (regardless of elapsed time or success/failure), reset
1589 * history bitmaps and rate-specific stats for all rates in
1590 * active table.
1591 */
1592 } else {
1593 lq_sta->table_count++;
1594 if (lq_sta->table_count >=
1595 lq_sta->table_count_limit) {
1596 lq_sta->table_count = 0;
1597
1598 IWL_DEBUG_RATE(mvm,
1599 "LQ: stay in table clear win\n");
1600 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1601 }
1602 }
1603
1604 /* If transitioning to allow "search", reset all history
1605 * bitmaps and stats in active table (this will become the new
1606 * "search" table). */
1607 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1608 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1609 }
1610 }
1611 }
1612
1613 /*
1614 * setup rate table in uCode
1615 */
1616 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1617 struct ieee80211_sta *sta,
1618 struct iwl_lq_sta *lq_sta,
1619 struct iwl_scale_tbl_info *tbl)
1620 {
1621 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1622 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1623 }
1624
1625 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1626 struct iwl_lq_sta *lq_sta,
1627 struct ieee80211_sta *sta,
1628 struct iwl_scale_tbl_info *tbl)
1629 {
1630 int i, j, max_rate;
1631 enum rs_column next_col_id;
1632 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1633 const struct rs_tx_column *next_col;
1634 allow_column_func_t allow_func;
1635 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1636 const u16 *expected_tpt_tbl;
1637 u16 tpt, max_expected_tpt;
1638
1639 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1640 next_col_id = curr_col->next_columns[i];
1641
1642 if (next_col_id == RS_COLUMN_INVALID)
1643 continue;
1644
1645 if (lq_sta->visited_columns & BIT(next_col_id)) {
1646 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1647 next_col_id);
1648 continue;
1649 }
1650
1651 next_col = &rs_tx_columns[next_col_id];
1652
1653 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1654 IWL_DEBUG_RATE(mvm,
1655 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1656 next_col_id, valid_ants, next_col->ant);
1657 continue;
1658 }
1659
1660 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1661 allow_func = next_col->checks[j];
1662 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1663 next_col))
1664 break;
1665 }
1666
1667 if (j != MAX_COLUMN_CHECKS) {
1668 IWL_DEBUG_RATE(mvm,
1669 "Skip column %d: not allowed (check %d failed)\n",
1670 next_col_id, j);
1671
1672 continue;
1673 }
1674
1675 tpt = lq_sta->last_tpt / 100;
1676 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1677 rs_bw_from_sta_bw(sta));
1678 if (WARN_ON_ONCE(!expected_tpt_tbl))
1679 continue;
1680
1681 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1682 if (max_rate == IWL_RATE_INVALID) {
1683 IWL_DEBUG_RATE(mvm,
1684 "Skip column %d: no rate is allowed in this column\n",
1685 next_col_id);
1686 continue;
1687 }
1688
1689 max_expected_tpt = expected_tpt_tbl[max_rate];
1690 if (tpt >= max_expected_tpt) {
1691 IWL_DEBUG_RATE(mvm,
1692 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1693 next_col_id, max_expected_tpt, tpt);
1694 continue;
1695 }
1696
1697 IWL_DEBUG_RATE(mvm,
1698 "Found potential column %d. Max expected %d current %d\n",
1699 next_col_id, max_expected_tpt, tpt);
1700 break;
1701 }
1702
1703 if (i == MAX_NEXT_COLUMNS)
1704 return RS_COLUMN_INVALID;
1705
1706 return next_col_id;
1707 }
1708
1709 static int rs_switch_to_column(struct iwl_mvm *mvm,
1710 struct iwl_lq_sta *lq_sta,
1711 struct ieee80211_sta *sta,
1712 enum rs_column col_id)
1713 {
1714 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1715 struct iwl_scale_tbl_info *search_tbl =
1716 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1717 struct rs_rate *rate = &search_tbl->rate;
1718 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1719 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1720 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1721 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1722 unsigned long rate_mask = 0;
1723 u32 rate_idx = 0;
1724
1725 memcpy(search_tbl, tbl, sz);
1726
1727 rate->sgi = column->sgi;
1728 rate->ant = column->ant;
1729
1730 if (column->mode == RS_LEGACY) {
1731 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1732 rate->type = LQ_LEGACY_A;
1733 else
1734 rate->type = LQ_LEGACY_G;
1735
1736 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1737 rate->ldpc = false;
1738 rate_mask = lq_sta->active_legacy_rate;
1739 } else if (column->mode == RS_SISO) {
1740 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1741 rate_mask = lq_sta->active_siso_rate;
1742 } else if (column->mode == RS_MIMO2) {
1743 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1744 rate_mask = lq_sta->active_mimo2_rate;
1745 } else {
1746 WARN_ON_ONCE("Bad column mode");
1747 }
1748
1749 if (column->mode != RS_LEGACY) {
1750 rate->bw = rs_bw_from_sta_bw(sta);
1751 rate->ldpc = lq_sta->ldpc;
1752 }
1753
1754 search_tbl->column = col_id;
1755 rs_set_expected_tpt_table(lq_sta, search_tbl);
1756
1757 lq_sta->visited_columns |= BIT(col_id);
1758
1759 /* Get the best matching rate if we're changing modes. e.g.
1760 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1761 */
1762 if (curr_column->mode != column->mode) {
1763 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1764 rate_mask, rate->index);
1765
1766 if ((rate_idx == IWL_RATE_INVALID) ||
1767 !(BIT(rate_idx) & rate_mask)) {
1768 IWL_DEBUG_RATE(mvm,
1769 "can not switch with index %d"
1770 " rate mask %lx\n",
1771 rate_idx, rate_mask);
1772
1773 goto err;
1774 }
1775
1776 rate->index = rate_idx;
1777 }
1778
1779 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1780 col_id, rate->index);
1781
1782 return 0;
1783
1784 err:
1785 rate->type = LQ_NONE;
1786 return -1;
1787 }
1788
1789 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1790 struct iwl_scale_tbl_info *tbl,
1791 s32 sr, int low, int high,
1792 int current_tpt,
1793 int low_tpt, int high_tpt)
1794 {
1795 enum rs_action action = RS_ACTION_STAY;
1796
1797 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1798 (current_tpt == 0)) {
1799 IWL_DEBUG_RATE(mvm,
1800 "Decrease rate because of low SR\n");
1801 return RS_ACTION_DOWNSCALE;
1802 }
1803
1804 if ((low_tpt == IWL_INVALID_VALUE) &&
1805 (high_tpt == IWL_INVALID_VALUE) &&
1806 (high != IWL_RATE_INVALID)) {
1807 IWL_DEBUG_RATE(mvm,
1808 "No data about high/low rates. Increase rate\n");
1809 return RS_ACTION_UPSCALE;
1810 }
1811
1812 if ((high_tpt == IWL_INVALID_VALUE) &&
1813 (high != IWL_RATE_INVALID) &&
1814 (low_tpt != IWL_INVALID_VALUE) &&
1815 (low_tpt < current_tpt)) {
1816 IWL_DEBUG_RATE(mvm,
1817 "No data about high rate and low rate is worse. Increase rate\n");
1818 return RS_ACTION_UPSCALE;
1819 }
1820
1821 if ((high_tpt != IWL_INVALID_VALUE) &&
1822 (high_tpt > current_tpt)) {
1823 IWL_DEBUG_RATE(mvm,
1824 "Higher rate is better. Increate rate\n");
1825 return RS_ACTION_UPSCALE;
1826 }
1827
1828 if ((low_tpt != IWL_INVALID_VALUE) &&
1829 (high_tpt != IWL_INVALID_VALUE) &&
1830 (low_tpt < current_tpt) &&
1831 (high_tpt < current_tpt)) {
1832 IWL_DEBUG_RATE(mvm,
1833 "Both high and low are worse. Maintain rate\n");
1834 return RS_ACTION_STAY;
1835 }
1836
1837 if ((low_tpt != IWL_INVALID_VALUE) &&
1838 (low_tpt > current_tpt)) {
1839 IWL_DEBUG_RATE(mvm,
1840 "Lower rate is better\n");
1841 action = RS_ACTION_DOWNSCALE;
1842 goto out;
1843 }
1844
1845 if ((low_tpt == IWL_INVALID_VALUE) &&
1846 (low != IWL_RATE_INVALID)) {
1847 IWL_DEBUG_RATE(mvm,
1848 "No data about lower rate\n");
1849 action = RS_ACTION_DOWNSCALE;
1850 goto out;
1851 }
1852
1853 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1854
1855 out:
1856 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1857 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1858 IWL_DEBUG_RATE(mvm,
1859 "SR is above NO DECREASE. Avoid downscale\n");
1860 action = RS_ACTION_STAY;
1861 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1862 IWL_DEBUG_RATE(mvm,
1863 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1864 action = RS_ACTION_STAY;
1865 } else {
1866 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1867 }
1868 }
1869
1870 return action;
1871 }
1872
1873 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1874 struct iwl_lq_sta *lq_sta)
1875 {
1876 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1877 * supports STBC of at least 1*SS
1878 */
1879 if (!lq_sta->stbc_capable)
1880 return false;
1881
1882 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1883 return false;
1884
1885 return true;
1886 }
1887
1888 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1889 int *weaker, int *stronger)
1890 {
1891 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1892 if (*weaker > TPC_MAX_REDUCTION)
1893 *weaker = TPC_INVALID;
1894
1895 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1896 if (*stronger < 0)
1897 *stronger = TPC_INVALID;
1898 }
1899
1900 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1901 struct rs_rate *rate, enum ieee80211_band band)
1902 {
1903 int index = rate->index;
1904 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1905 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1906 !vif->bss_conf.ps);
1907
1908 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1909 cam, sta_ps_disabled);
1910 /*
1911 * allow tpc only if power management is enabled, or bt coex
1912 * activity grade allows it and we are on 2.4Ghz.
1913 */
1914 if ((cam || sta_ps_disabled) &&
1915 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1916 return false;
1917
1918 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1919 if (is_legacy(rate))
1920 return index == IWL_RATE_54M_INDEX;
1921 if (is_ht(rate))
1922 return index == IWL_RATE_MCS_7_INDEX;
1923 if (is_vht(rate))
1924 return index == IWL_RATE_MCS_7_INDEX ||
1925 index == IWL_RATE_MCS_8_INDEX ||
1926 index == IWL_RATE_MCS_9_INDEX;
1927
1928 WARN_ON_ONCE(1);
1929 return false;
1930 }
1931
1932 enum tpc_action {
1933 TPC_ACTION_STAY,
1934 TPC_ACTION_DECREASE,
1935 TPC_ACTION_INCREASE,
1936 TPC_ACTION_NO_RESTIRCTION,
1937 };
1938
1939 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1940 s32 sr, int weak, int strong,
1941 int current_tpt,
1942 int weak_tpt, int strong_tpt)
1943 {
1944 /* stay until we have valid tpt */
1945 if (current_tpt == IWL_INVALID_VALUE) {
1946 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1947 return TPC_ACTION_STAY;
1948 }
1949
1950 /* Too many failures, increase txp */
1951 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1952 current_tpt == 0) {
1953 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1954 return TPC_ACTION_NO_RESTIRCTION;
1955 }
1956
1957 /* try decreasing first if applicable */
1958 if (weak != TPC_INVALID) {
1959 if (weak_tpt == IWL_INVALID_VALUE &&
1960 (strong_tpt == IWL_INVALID_VALUE ||
1961 current_tpt >= strong_tpt)) {
1962 IWL_DEBUG_RATE(mvm,
1963 "no weak txp measurement. decrease txp\n");
1964 return TPC_ACTION_DECREASE;
1965 }
1966
1967 if (weak_tpt > current_tpt) {
1968 IWL_DEBUG_RATE(mvm,
1969 "lower txp has better tpt. decrease txp\n");
1970 return TPC_ACTION_DECREASE;
1971 }
1972 }
1973
1974 /* next, increase if needed */
1975 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1976 strong != TPC_INVALID) {
1977 if (weak_tpt == IWL_INVALID_VALUE &&
1978 strong_tpt != IWL_INVALID_VALUE &&
1979 current_tpt < strong_tpt) {
1980 IWL_DEBUG_RATE(mvm,
1981 "higher txp has better tpt. increase txp\n");
1982 return TPC_ACTION_INCREASE;
1983 }
1984
1985 if (weak_tpt < current_tpt &&
1986 (strong_tpt == IWL_INVALID_VALUE ||
1987 strong_tpt > current_tpt)) {
1988 IWL_DEBUG_RATE(mvm,
1989 "lower txp has worse tpt. increase txp\n");
1990 return TPC_ACTION_INCREASE;
1991 }
1992 }
1993
1994 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1995 return TPC_ACTION_STAY;
1996 }
1997
1998 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1999 struct ieee80211_sta *sta,
2000 struct iwl_lq_sta *lq_sta,
2001 struct iwl_scale_tbl_info *tbl)
2002 {
2003 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2004 struct ieee80211_vif *vif = mvm_sta->vif;
2005 struct ieee80211_chanctx_conf *chanctx_conf;
2006 enum ieee80211_band band;
2007 struct iwl_rate_scale_data *window;
2008 struct rs_rate *rate = &tbl->rate;
2009 enum tpc_action action;
2010 s32 sr;
2011 u8 cur = lq_sta->lq.reduced_tpc;
2012 int current_tpt;
2013 int weak, strong;
2014 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2015
2016 #ifdef CONFIG_MAC80211_DEBUGFS
2017 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2018 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2019 lq_sta->pers.dbg_fixed_txp_reduction);
2020 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2021 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2022 }
2023 #endif
2024
2025 rcu_read_lock();
2026 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2027 if (WARN_ON(!chanctx_conf))
2028 band = IEEE80211_NUM_BANDS;
2029 else
2030 band = chanctx_conf->def.chan->band;
2031 rcu_read_unlock();
2032
2033 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2034 IWL_DEBUG_RATE(mvm,
2035 "tpc is not allowed. remove txp restrictions\n");
2036 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2037 return cur != TPC_NO_REDUCTION;
2038 }
2039
2040 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2041
2042 /* Collect measured throughputs for current and adjacent rates */
2043 window = tbl->tpc_win;
2044 sr = window[cur].success_ratio;
2045 current_tpt = window[cur].average_tpt;
2046 if (weak != TPC_INVALID)
2047 weak_tpt = window[weak].average_tpt;
2048 if (strong != TPC_INVALID)
2049 strong_tpt = window[strong].average_tpt;
2050
2051 IWL_DEBUG_RATE(mvm,
2052 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2053 cur, current_tpt, sr, weak, strong,
2054 weak_tpt, strong_tpt);
2055
2056 action = rs_get_tpc_action(mvm, sr, weak, strong,
2057 current_tpt, weak_tpt, strong_tpt);
2058
2059 /* override actions if we are on the edge */
2060 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2061 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2062 action = TPC_ACTION_STAY;
2063 } else if (strong == TPC_INVALID &&
2064 (action == TPC_ACTION_INCREASE ||
2065 action == TPC_ACTION_NO_RESTIRCTION)) {
2066 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2067 action = TPC_ACTION_STAY;
2068 }
2069
2070 switch (action) {
2071 case TPC_ACTION_DECREASE:
2072 lq_sta->lq.reduced_tpc = weak;
2073 return true;
2074 case TPC_ACTION_INCREASE:
2075 lq_sta->lq.reduced_tpc = strong;
2076 return true;
2077 case TPC_ACTION_NO_RESTIRCTION:
2078 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2079 return true;
2080 case TPC_ACTION_STAY:
2081 /* do nothing */
2082 break;
2083 }
2084 return false;
2085 }
2086
2087 /*
2088 * Do rate scaling and search for new modulation mode.
2089 */
2090 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2091 struct ieee80211_sta *sta,
2092 struct iwl_lq_sta *lq_sta,
2093 int tid)
2094 {
2095 int low = IWL_RATE_INVALID;
2096 int high = IWL_RATE_INVALID;
2097 int index;
2098 struct iwl_rate_scale_data *window = NULL;
2099 int current_tpt = IWL_INVALID_VALUE;
2100 int low_tpt = IWL_INVALID_VALUE;
2101 int high_tpt = IWL_INVALID_VALUE;
2102 u32 fail_count;
2103 enum rs_action scale_action = RS_ACTION_STAY;
2104 u16 rate_mask;
2105 u8 update_lq = 0;
2106 struct iwl_scale_tbl_info *tbl, *tbl1;
2107 u8 active_tbl = 0;
2108 u8 done_search = 0;
2109 u16 high_low;
2110 s32 sr;
2111 u8 prev_agg = lq_sta->is_agg;
2112 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2113 struct iwl_mvm_tid_data *tid_data;
2114 struct rs_rate *rate;
2115
2116 lq_sta->is_agg = !!sta_priv->agg_tids;
2117
2118 /*
2119 * Select rate-scale / modulation-mode table to work with in
2120 * the rest of this function: "search" if searching for better
2121 * modulation mode, or "active" if doing rate scaling within a mode.
2122 */
2123 if (!lq_sta->search_better_tbl)
2124 active_tbl = lq_sta->active_tbl;
2125 else
2126 active_tbl = 1 - lq_sta->active_tbl;
2127
2128 tbl = &(lq_sta->lq_info[active_tbl]);
2129 rate = &tbl->rate;
2130
2131 if (prev_agg != lq_sta->is_agg) {
2132 IWL_DEBUG_RATE(mvm,
2133 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2134 prev_agg, lq_sta->is_agg);
2135 rs_set_expected_tpt_table(lq_sta, tbl);
2136 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2137 }
2138
2139 /* current tx rate */
2140 index = rate->index;
2141
2142 /* rates available for this association, and for modulation mode */
2143 rate_mask = rs_get_supported_rates(lq_sta, rate);
2144
2145 if (!(BIT(index) & rate_mask)) {
2146 IWL_ERR(mvm, "Current Rate is not valid\n");
2147 if (lq_sta->search_better_tbl) {
2148 /* revert to active table if search table is not valid*/
2149 rate->type = LQ_NONE;
2150 lq_sta->search_better_tbl = 0;
2151 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2152 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2153 }
2154 return;
2155 }
2156
2157 /* Get expected throughput table and history window for current rate */
2158 if (!tbl->expected_tpt) {
2159 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2160 return;
2161 }
2162
2163 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2164 window = &(tbl->win[index]);
2165
2166 /*
2167 * If there is not enough history to calculate actual average
2168 * throughput, keep analyzing results of more tx frames, without
2169 * changing rate or mode (bypass most of the rest of this function).
2170 * Set up new rate table in uCode only if old rate is not supported
2171 * in current association (use new rate found above).
2172 */
2173 fail_count = window->counter - window->success_counter;
2174 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2175 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2176 IWL_DEBUG_RATE(mvm,
2177 "(%s: %d): Test Window: succ %d total %d\n",
2178 rs_pretty_lq_type(rate->type),
2179 index, window->success_counter, window->counter);
2180
2181 /* Can't calculate this yet; not enough history */
2182 window->average_tpt = IWL_INVALID_VALUE;
2183
2184 /* Should we stay with this modulation mode,
2185 * or search for a new one? */
2186 rs_stay_in_table(lq_sta, false);
2187
2188 return;
2189 }
2190
2191 /* If we are searching for better modulation mode, check success. */
2192 if (lq_sta->search_better_tbl) {
2193 /* If good success, continue using the "search" mode;
2194 * no need to send new link quality command, since we're
2195 * continuing to use the setup that we've been trying. */
2196 if (window->average_tpt > lq_sta->last_tpt) {
2197 IWL_DEBUG_RATE(mvm,
2198 "SWITCHING TO NEW TABLE SR: %d "
2199 "cur-tpt %d old-tpt %d\n",
2200 window->success_ratio,
2201 window->average_tpt,
2202 lq_sta->last_tpt);
2203
2204 /* Swap tables; "search" becomes "active" */
2205 lq_sta->active_tbl = active_tbl;
2206 current_tpt = window->average_tpt;
2207 /* Else poor success; go back to mode in "active" table */
2208 } else {
2209 IWL_DEBUG_RATE(mvm,
2210 "GOING BACK TO THE OLD TABLE: SR %d "
2211 "cur-tpt %d old-tpt %d\n",
2212 window->success_ratio,
2213 window->average_tpt,
2214 lq_sta->last_tpt);
2215
2216 /* Nullify "search" table */
2217 rate->type = LQ_NONE;
2218
2219 /* Revert to "active" table */
2220 active_tbl = lq_sta->active_tbl;
2221 tbl = &(lq_sta->lq_info[active_tbl]);
2222
2223 /* Revert to "active" rate and throughput info */
2224 index = tbl->rate.index;
2225 current_tpt = lq_sta->last_tpt;
2226
2227 /* Need to set up a new rate table in uCode */
2228 update_lq = 1;
2229 }
2230
2231 /* Either way, we've made a decision; modulation mode
2232 * search is done, allow rate adjustment next time. */
2233 lq_sta->search_better_tbl = 0;
2234 done_search = 1; /* Don't switch modes below! */
2235 goto lq_update;
2236 }
2237
2238 /* (Else) not in search of better modulation mode, try for better
2239 * starting rate, while staying in this mode. */
2240 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2241 low = high_low & 0xff;
2242 high = (high_low >> 8) & 0xff;
2243
2244 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2245
2246 sr = window->success_ratio;
2247
2248 /* Collect measured throughputs for current and adjacent rates */
2249 current_tpt = window->average_tpt;
2250 if (low != IWL_RATE_INVALID)
2251 low_tpt = tbl->win[low].average_tpt;
2252 if (high != IWL_RATE_INVALID)
2253 high_tpt = tbl->win[high].average_tpt;
2254
2255 IWL_DEBUG_RATE(mvm,
2256 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2257 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2258 low, high, low_tpt, high_tpt);
2259
2260 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2261 current_tpt, low_tpt, high_tpt);
2262
2263 /* Force a search in case BT doesn't like us being in MIMO */
2264 if (is_mimo(rate) &&
2265 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2266 IWL_DEBUG_RATE(mvm,
2267 "BT Coex forbids MIMO. Search for new config\n");
2268 rs_stay_in_table(lq_sta, true);
2269 goto lq_update;
2270 }
2271
2272 switch (scale_action) {
2273 case RS_ACTION_DOWNSCALE:
2274 /* Decrease starting rate, update uCode's rate table */
2275 if (low != IWL_RATE_INVALID) {
2276 update_lq = 1;
2277 index = low;
2278 } else {
2279 IWL_DEBUG_RATE(mvm,
2280 "At the bottom rate. Can't decrease\n");
2281 }
2282
2283 break;
2284 case RS_ACTION_UPSCALE:
2285 /* Increase starting rate, update uCode's rate table */
2286 if (high != IWL_RATE_INVALID) {
2287 update_lq = 1;
2288 index = high;
2289 } else {
2290 IWL_DEBUG_RATE(mvm,
2291 "At the top rate. Can't increase\n");
2292 }
2293
2294 break;
2295 case RS_ACTION_STAY:
2296 /* No change */
2297 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2298 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2299 break;
2300 default:
2301 break;
2302 }
2303
2304 lq_update:
2305 /* Replace uCode's rate table for the destination station. */
2306 if (update_lq) {
2307 tbl->rate.index = index;
2308 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2309 }
2310
2311 rs_stay_in_table(lq_sta, false);
2312
2313 /*
2314 * Search for new modulation mode if we're:
2315 * 1) Not changing rates right now
2316 * 2) Not just finishing up a search
2317 * 3) Allowing a new search
2318 */
2319 if (!update_lq && !done_search &&
2320 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2321 && window->counter) {
2322 enum rs_column next_column;
2323
2324 /* Save current throughput to compare with "search" throughput*/
2325 lq_sta->last_tpt = current_tpt;
2326
2327 IWL_DEBUG_RATE(mvm,
2328 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2329 update_lq, done_search, lq_sta->rs_state,
2330 window->counter);
2331
2332 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2333 if (next_column != RS_COLUMN_INVALID) {
2334 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2335 next_column);
2336 if (!ret)
2337 lq_sta->search_better_tbl = 1;
2338 } else {
2339 IWL_DEBUG_RATE(mvm,
2340 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2341 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2342 }
2343
2344 /* If new "search" mode was selected, set up in uCode table */
2345 if (lq_sta->search_better_tbl) {
2346 /* Access the "search" table, clear its history. */
2347 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2348 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2349
2350 /* Use new "search" start rate */
2351 index = tbl->rate.index;
2352
2353 rs_dump_rate(mvm, &tbl->rate,
2354 "Switch to SEARCH TABLE:");
2355 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2356 } else {
2357 done_search = 1;
2358 }
2359 }
2360
2361 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2362 /* If the "active" (non-search) mode was legacy,
2363 * and we've tried switching antennas,
2364 * but we haven't been able to try HT modes (not available),
2365 * stay with best antenna legacy modulation for a while
2366 * before next round of mode comparisons. */
2367 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2368 if (is_legacy(&tbl1->rate)) {
2369 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2370
2371 if (tid != IWL_MAX_TID_COUNT) {
2372 tid_data = &sta_priv->tid_data[tid];
2373 if (tid_data->state != IWL_AGG_OFF) {
2374 IWL_DEBUG_RATE(mvm,
2375 "Stop aggregation on tid %d\n",
2376 tid);
2377 ieee80211_stop_tx_ba_session(sta, tid);
2378 }
2379 }
2380 rs_set_stay_in_table(mvm, 1, lq_sta);
2381 } else {
2382 /* If we're in an HT mode, and all 3 mode switch actions
2383 * have been tried and compared, stay in this best modulation
2384 * mode for a while before next round of mode comparisons. */
2385 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2386 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2387 (tid != IWL_MAX_TID_COUNT)) {
2388 tid_data = &sta_priv->tid_data[tid];
2389 if (tid_data->state == IWL_AGG_OFF) {
2390 IWL_DEBUG_RATE(mvm,
2391 "try to aggregate tid %d\n",
2392 tid);
2393 rs_tl_turn_on_agg(mvm, tid,
2394 lq_sta, sta);
2395 }
2396 }
2397 rs_set_stay_in_table(mvm, 0, lq_sta);
2398 }
2399 }
2400 }
2401
2402 struct rs_init_rate_info {
2403 s8 rssi;
2404 u8 rate_idx;
2405 };
2406
2407 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2408 { -60, IWL_RATE_54M_INDEX },
2409 { -64, IWL_RATE_48M_INDEX },
2410 { -68, IWL_RATE_36M_INDEX },
2411 { -80, IWL_RATE_24M_INDEX },
2412 { -84, IWL_RATE_18M_INDEX },
2413 { -85, IWL_RATE_12M_INDEX },
2414 { -86, IWL_RATE_11M_INDEX },
2415 { -88, IWL_RATE_5M_INDEX },
2416 { -90, IWL_RATE_2M_INDEX },
2417 { S8_MIN, IWL_RATE_1M_INDEX },
2418 };
2419
2420 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2421 { -60, IWL_RATE_54M_INDEX },
2422 { -64, IWL_RATE_48M_INDEX },
2423 { -72, IWL_RATE_36M_INDEX },
2424 { -80, IWL_RATE_24M_INDEX },
2425 { -84, IWL_RATE_18M_INDEX },
2426 { -85, IWL_RATE_12M_INDEX },
2427 { -87, IWL_RATE_9M_INDEX },
2428 { S8_MIN, IWL_RATE_6M_INDEX },
2429 };
2430
2431 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2432 { -60, IWL_RATE_MCS_7_INDEX },
2433 { -64, IWL_RATE_MCS_6_INDEX },
2434 { -68, IWL_RATE_MCS_5_INDEX },
2435 { -72, IWL_RATE_MCS_4_INDEX },
2436 { -80, IWL_RATE_MCS_3_INDEX },
2437 { -84, IWL_RATE_MCS_2_INDEX },
2438 { -85, IWL_RATE_MCS_1_INDEX },
2439 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2440 };
2441
2442 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2443 { -60, IWL_RATE_MCS_8_INDEX },
2444 { -64, IWL_RATE_MCS_7_INDEX },
2445 { -68, IWL_RATE_MCS_6_INDEX },
2446 { -72, IWL_RATE_MCS_5_INDEX },
2447 { -80, IWL_RATE_MCS_4_INDEX },
2448 { -84, IWL_RATE_MCS_3_INDEX },
2449 { -85, IWL_RATE_MCS_2_INDEX },
2450 { -87, IWL_RATE_MCS_1_INDEX },
2451 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2452 };
2453
2454 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
2455 { -60, IWL_RATE_MCS_9_INDEX },
2456 { -64, IWL_RATE_MCS_8_INDEX },
2457 { -68, IWL_RATE_MCS_7_INDEX },
2458 { -72, IWL_RATE_MCS_6_INDEX },
2459 { -80, IWL_RATE_MCS_5_INDEX },
2460 { -84, IWL_RATE_MCS_4_INDEX },
2461 { -85, IWL_RATE_MCS_3_INDEX },
2462 { -87, IWL_RATE_MCS_2_INDEX },
2463 { -88, IWL_RATE_MCS_1_INDEX },
2464 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2465 };
2466
2467 /* Init the optimal rate based on STA caps
2468 * This combined with rssi is used to report the last tx rate
2469 * to userspace when we haven't transmitted enough frames.
2470 */
2471 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2472 struct ieee80211_sta *sta,
2473 struct iwl_lq_sta *lq_sta)
2474 {
2475 struct rs_rate *rate = &lq_sta->optimal_rate;
2476
2477 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2478 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2479 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2480 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2481 else if (lq_sta->band == IEEE80211_BAND_5GHZ)
2482 rate->type = LQ_LEGACY_A;
2483 else
2484 rate->type = LQ_LEGACY_G;
2485
2486 rate->bw = rs_bw_from_sta_bw(sta);
2487 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2488
2489 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2490
2491 if (is_mimo(rate)) {
2492 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2493 } else if (is_siso(rate)) {
2494 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2495 } else {
2496 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2497
2498 if (lq_sta->band == IEEE80211_BAND_5GHZ) {
2499 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2500 lq_sta->optimal_nentries =
2501 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2502 } else {
2503 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2504 lq_sta->optimal_nentries =
2505 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2506 }
2507 }
2508
2509 if (is_vht(rate)) {
2510 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2511 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2512 lq_sta->optimal_nentries =
2513 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2514 } else {
2515 lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
2516 lq_sta->optimal_nentries =
2517 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2518 }
2519 } else if (is_ht(rate)) {
2520 lq_sta->optimal_rates = rs_optimal_rates_ht;
2521 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2522 }
2523 }
2524
2525 /* Compute the optimal rate index based on RSSI */
2526 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2527 struct iwl_lq_sta *lq_sta)
2528 {
2529 struct rs_rate *rate = &lq_sta->optimal_rate;
2530 int i;
2531
2532 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2533 BITS_PER_LONG);
2534
2535 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2536 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2537
2538 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2539 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2540 rate->index = rate_idx;
2541 break;
2542 }
2543 }
2544
2545 rs_dump_rate(mvm, rate, "OPTIMAL RATE");
2546 return rate;
2547 }
2548
2549 /* Choose an initial legacy rate and antenna to use based on the RSSI
2550 * of last Rx
2551 */
2552 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2553 struct iwl_lq_sta *lq_sta,
2554 enum ieee80211_band band,
2555 struct rs_rate *rate)
2556 {
2557 int i, nentries;
2558 s8 best_rssi = S8_MIN;
2559 u8 best_ant = ANT_NONE;
2560 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2561 const struct rs_init_rate_info *initial_rates;
2562
2563 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2564 if (!(lq_sta->pers.chains & BIT(i)))
2565 continue;
2566
2567 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2568 best_rssi = lq_sta->pers.chain_signal[i];
2569 best_ant = BIT(i);
2570 }
2571 }
2572
2573 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2574 rs_pretty_ant(best_ant), best_rssi);
2575
2576 if (best_ant != ANT_A && best_ant != ANT_B)
2577 rate->ant = first_antenna(valid_tx_ant);
2578 else
2579 rate->ant = best_ant;
2580
2581 rate->sgi = false;
2582 rate->ldpc = false;
2583 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2584
2585 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2586 BITS_PER_LONG);
2587
2588 if (band == IEEE80211_BAND_5GHZ) {
2589 rate->type = LQ_LEGACY_A;
2590 initial_rates = rs_optimal_rates_5ghz_legacy;
2591 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2592 } else {
2593 rate->type = LQ_LEGACY_G;
2594 initial_rates = rs_optimal_rates_24ghz_legacy;
2595 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2596 }
2597
2598 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2599 for (i = 0; i < nentries; i++) {
2600 int rate_idx = initial_rates[i].rate_idx;
2601 if ((best_rssi >= initial_rates[i].rssi) &&
2602 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2603 rate->index = rate_idx;
2604 break;
2605 }
2606 }
2607 }
2608
2609 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2610 rs_pretty_ant(rate->ant));
2611 }
2612
2613 /* Save info about RSSI of last Rx */
2614 void rs_update_last_rssi(struct iwl_mvm *mvm,
2615 struct iwl_lq_sta *lq_sta,
2616 struct ieee80211_rx_status *rx_status)
2617 {
2618 int i;
2619
2620 lq_sta->pers.chains = rx_status->chains;
2621 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2622 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2623 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2624 lq_sta->pers.last_rssi = S8_MIN;
2625
2626 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2627 if (!(lq_sta->pers.chains & BIT(i)))
2628 continue;
2629
2630 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2631 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2632 }
2633 }
2634
2635 /**
2636 * rs_initialize_lq - Initialize a station's hardware rate table
2637 *
2638 * The uCode's station table contains a table of fallback rates
2639 * for automatic fallback during transmission.
2640 *
2641 * NOTE: This sets up a default set of values. These will be replaced later
2642 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2643 * rc80211_simple.
2644 *
2645 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2646 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2647 * which requires station table entry to exist).
2648 */
2649 static void rs_initialize_lq(struct iwl_mvm *mvm,
2650 struct ieee80211_sta *sta,
2651 struct iwl_lq_sta *lq_sta,
2652 enum ieee80211_band band,
2653 bool init)
2654 {
2655 struct iwl_scale_tbl_info *tbl;
2656 struct rs_rate *rate;
2657 u8 active_tbl = 0;
2658
2659 if (!sta || !lq_sta)
2660 return;
2661
2662 if (!lq_sta->search_better_tbl)
2663 active_tbl = lq_sta->active_tbl;
2664 else
2665 active_tbl = 1 - lq_sta->active_tbl;
2666
2667 tbl = &(lq_sta->lq_info[active_tbl]);
2668 rate = &tbl->rate;
2669
2670 rs_get_initial_rate(mvm, lq_sta, band, rate);
2671 rs_init_optimal_rate(mvm, sta, lq_sta);
2672
2673 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2674 if (rate->ant == ANT_A)
2675 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2676 else
2677 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2678
2679 rs_set_expected_tpt_table(lq_sta, tbl);
2680 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2681 /* TODO restore station should remember the lq cmd */
2682 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2683 }
2684
2685 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2686 struct ieee80211_tx_rate_control *txrc)
2687 {
2688 struct sk_buff *skb = txrc->skb;
2689 struct iwl_op_mode *op_mode __maybe_unused =
2690 (struct iwl_op_mode *)mvm_r;
2691 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2692 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2693 struct iwl_lq_sta *lq_sta = mvm_sta;
2694 struct rs_rate *optimal_rate;
2695 u32 last_ucode_rate;
2696
2697 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2698 /* if vif isn't initialized mvm doesn't know about
2699 * this station, so don't do anything with the it
2700 */
2701 sta = NULL;
2702 mvm_sta = NULL;
2703 }
2704
2705 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2706
2707 /* Treat uninitialized rate scaling data same as non-existing. */
2708 if (lq_sta && !lq_sta->pers.drv) {
2709 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2710 mvm_sta = NULL;
2711 }
2712
2713 /* Send management frames and NO_ACK data using lowest rate. */
2714 if (rate_control_send_low(sta, mvm_sta, txrc))
2715 return;
2716
2717 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2718 info->band, &info->control.rates[0]);
2719 info->control.rates[0].count = 1;
2720
2721 /* Report the optimal rate based on rssi and STA caps if we haven't
2722 * converged yet (too little traffic) or exploring other modulations
2723 */
2724 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2725 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2726 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2727 optimal_rate);
2728 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2729 &txrc->reported_rate);
2730 }
2731 }
2732
2733 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2734 gfp_t gfp)
2735 {
2736 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2737 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2738 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2739 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2740
2741 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2742
2743 lq_sta->pers.drv = mvm;
2744 #ifdef CONFIG_MAC80211_DEBUGFS
2745 lq_sta->pers.dbg_fixed_rate = 0;
2746 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2747 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2748 #endif
2749 lq_sta->pers.chains = 0;
2750 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2751 lq_sta->pers.last_rssi = S8_MIN;
2752
2753 return &sta_priv->lq_sta;
2754 }
2755
2756 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2757 int nss)
2758 {
2759 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2760 (0x3 << (2 * (nss - 1)));
2761 rx_mcs >>= (2 * (nss - 1));
2762
2763 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2764 return IWL_RATE_MCS_7_INDEX;
2765 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2766 return IWL_RATE_MCS_8_INDEX;
2767 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2768 return IWL_RATE_MCS_9_INDEX;
2769
2770 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2771 return -1;
2772 }
2773
2774 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2775 struct ieee80211_sta_vht_cap *vht_cap,
2776 struct iwl_lq_sta *lq_sta)
2777 {
2778 int i;
2779 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2780
2781 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2782 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2783 if (i == IWL_RATE_9M_INDEX)
2784 continue;
2785
2786 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2787 if (i == IWL_RATE_MCS_9_INDEX &&
2788 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2789 continue;
2790
2791 lq_sta->active_siso_rate |= BIT(i);
2792 }
2793 }
2794
2795 if (sta->rx_nss < 2)
2796 return;
2797
2798 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2799 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2800 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2801 if (i == IWL_RATE_9M_INDEX)
2802 continue;
2803
2804 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2805 if (i == IWL_RATE_MCS_9_INDEX &&
2806 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2807 continue;
2808
2809 lq_sta->active_mimo2_rate |= BIT(i);
2810 }
2811 }
2812 }
2813
2814 static void rs_ht_init(struct iwl_mvm *mvm,
2815 struct ieee80211_sta *sta,
2816 struct iwl_lq_sta *lq_sta,
2817 struct ieee80211_sta_ht_cap *ht_cap)
2818 {
2819 /* active_siso_rate mask includes 9 MBits (bit 5),
2820 * and CCK (bits 0-3), supp_rates[] does not;
2821 * shift to convert format, force 9 MBits off.
2822 */
2823 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2824 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2825 lq_sta->active_siso_rate &= ~((u16)0x2);
2826 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2827
2828 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2829 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2830 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2831 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2832
2833 if (mvm->cfg->ht_params->ldpc &&
2834 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2835 lq_sta->ldpc = true;
2836
2837 if (mvm->cfg->ht_params->stbc &&
2838 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2839 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2840 lq_sta->stbc_capable = true;
2841
2842 lq_sta->is_vht = false;
2843 }
2844
2845 static void rs_vht_init(struct iwl_mvm *mvm,
2846 struct ieee80211_sta *sta,
2847 struct iwl_lq_sta *lq_sta,
2848 struct ieee80211_sta_vht_cap *vht_cap)
2849 {
2850 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2851
2852 if (mvm->cfg->ht_params->ldpc &&
2853 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2854 lq_sta->ldpc = true;
2855
2856 if (mvm->cfg->ht_params->stbc &&
2857 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2858 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2859 lq_sta->stbc_capable = true;
2860
2861 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2862 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2863 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2864 lq_sta->bfer_capable = true;
2865
2866 lq_sta->is_vht = true;
2867 }
2868
2869 #ifdef CONFIG_IWLWIFI_DEBUGFS
2870 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2871 {
2872 spin_lock_bh(&mvm->drv_stats_lock);
2873 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2874 spin_unlock_bh(&mvm->drv_stats_lock);
2875 }
2876
2877 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2878 {
2879 u8 nss = 0, mcs = 0;
2880
2881 spin_lock(&mvm->drv_stats_lock);
2882
2883 if (agg)
2884 mvm->drv_rx_stats.agg_frames++;
2885
2886 mvm->drv_rx_stats.success_frames++;
2887
2888 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2889 case RATE_MCS_CHAN_WIDTH_20:
2890 mvm->drv_rx_stats.bw_20_frames++;
2891 break;
2892 case RATE_MCS_CHAN_WIDTH_40:
2893 mvm->drv_rx_stats.bw_40_frames++;
2894 break;
2895 case RATE_MCS_CHAN_WIDTH_80:
2896 mvm->drv_rx_stats.bw_80_frames++;
2897 break;
2898 default:
2899 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2900 }
2901
2902 if (rate & RATE_MCS_HT_MSK) {
2903 mvm->drv_rx_stats.ht_frames++;
2904 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2905 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2906 } else if (rate & RATE_MCS_VHT_MSK) {
2907 mvm->drv_rx_stats.vht_frames++;
2908 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2909 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2910 RATE_VHT_MCS_NSS_POS) + 1;
2911 } else {
2912 mvm->drv_rx_stats.legacy_frames++;
2913 }
2914
2915 if (nss == 1)
2916 mvm->drv_rx_stats.siso_frames++;
2917 else if (nss == 2)
2918 mvm->drv_rx_stats.mimo2_frames++;
2919
2920 if (rate & RATE_MCS_SGI_MSK)
2921 mvm->drv_rx_stats.sgi_frames++;
2922 else
2923 mvm->drv_rx_stats.ngi_frames++;
2924
2925 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2926 mvm->drv_rx_stats.last_frame_idx =
2927 (mvm->drv_rx_stats.last_frame_idx + 1) %
2928 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2929
2930 spin_unlock(&mvm->drv_stats_lock);
2931 }
2932 #endif
2933
2934 /*
2935 * Called after adding a new station to initialize rate scaling
2936 */
2937 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2938 enum ieee80211_band band, bool init)
2939 {
2940 int i, j;
2941 struct ieee80211_hw *hw = mvm->hw;
2942 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2943 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2944 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2945 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2946 struct ieee80211_supported_band *sband;
2947 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2948
2949 /* clear all non-persistent lq data */
2950 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2951
2952 sband = hw->wiphy->bands[band];
2953
2954 lq_sta->lq.sta_id = sta_priv->sta_id;
2955
2956 for (j = 0; j < LQ_SIZE; j++)
2957 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2958
2959 lq_sta->flush_timer = 0;
2960 lq_sta->last_tx = jiffies;
2961
2962 IWL_DEBUG_RATE(mvm,
2963 "LQ: *** rate scale station global init for station %d ***\n",
2964 sta_priv->sta_id);
2965 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2966 * the lowest or the highest rate.. Could consider using RSSI from
2967 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2968 * after assoc.. */
2969
2970 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2971 lq_sta->band = sband->band;
2972 /*
2973 * active legacy rates as per supported rates bitmap
2974 */
2975 supp = sta->supp_rates[sband->band];
2976 lq_sta->active_legacy_rate = 0;
2977 for_each_set_bit(i, &supp, BITS_PER_LONG)
2978 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2979
2980 /* TODO: should probably account for rx_highest for both HT/VHT */
2981 if (!vht_cap || !vht_cap->vht_supported)
2982 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2983 else
2984 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2985
2986 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2987 lq_sta->active_mimo2_rate = 0;
2988
2989 lq_sta->max_legacy_rate_idx =
2990 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2991 lq_sta->max_siso_rate_idx =
2992 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2993 lq_sta->max_mimo2_rate_idx =
2994 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2995
2996 IWL_DEBUG_RATE(mvm,
2997 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2998 lq_sta->active_legacy_rate,
2999 lq_sta->active_siso_rate,
3000 lq_sta->active_mimo2_rate,
3001 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3002 lq_sta->bfer_capable);
3003 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3004 lq_sta->max_legacy_rate_idx,
3005 lq_sta->max_siso_rate_idx,
3006 lq_sta->max_mimo2_rate_idx);
3007
3008 /* These values will be overridden later */
3009 lq_sta->lq.single_stream_ant_msk =
3010 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3011 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3012
3013 /* as default allow aggregation for all tids */
3014 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3015 lq_sta->is_agg = 0;
3016 #ifdef CONFIG_IWLWIFI_DEBUGFS
3017 iwl_mvm_reset_frame_stats(mvm);
3018 #endif
3019 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3020 }
3021
3022 static void rs_rate_update(void *mvm_r,
3023 struct ieee80211_supported_band *sband,
3024 struct cfg80211_chan_def *chandef,
3025 struct ieee80211_sta *sta, void *priv_sta,
3026 u32 changed)
3027 {
3028 u8 tid;
3029 struct iwl_op_mode *op_mode =
3030 (struct iwl_op_mode *)mvm_r;
3031 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3032
3033 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3034 return;
3035
3036 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3037 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3038 ieee80211_stop_tx_ba_session(sta, tid);
3039
3040 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3041 }
3042
3043 #ifdef CONFIG_MAC80211_DEBUGFS
3044 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3045 struct iwl_lq_cmd *lq_cmd,
3046 enum ieee80211_band band,
3047 u32 ucode_rate)
3048 {
3049 struct rs_rate rate;
3050 int i;
3051 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3052 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3053 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3054
3055 for (i = 0; i < num_rates; i++)
3056 lq_cmd->rs_table[i] = ucode_rate_le32;
3057
3058 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3059
3060 if (is_mimo(&rate))
3061 lq_cmd->mimo_delim = num_rates - 1;
3062 else
3063 lq_cmd->mimo_delim = 0;
3064
3065 lq_cmd->reduced_tpc = 0;
3066
3067 if (num_of_ant(ant) == 1)
3068 lq_cmd->single_stream_ant_msk = ant;
3069
3070 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3071 }
3072 #endif /* CONFIG_MAC80211_DEBUGFS */
3073
3074 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3075 struct iwl_lq_sta *lq_sta,
3076 struct rs_rate *rate,
3077 __le32 *rs_table, int *rs_table_index,
3078 int num_rates, int num_retries,
3079 u8 valid_tx_ant, bool toggle_ant)
3080 {
3081 int i, j;
3082 __le32 ucode_rate;
3083 bool bottom_reached = false;
3084 int prev_rate_idx = rate->index;
3085 int end = LINK_QUAL_MAX_RETRY_NUM;
3086 int index = *rs_table_index;
3087
3088 for (i = 0; i < num_rates && index < end; i++) {
3089 for (j = 0; j < num_retries && index < end; j++, index++) {
3090 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3091 rate));
3092 rs_table[index] = ucode_rate;
3093 if (toggle_ant)
3094 rs_toggle_antenna(valid_tx_ant, rate);
3095 }
3096
3097 prev_rate_idx = rate->index;
3098 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3099 if (bottom_reached && !is_legacy(rate))
3100 break;
3101 }
3102
3103 if (!bottom_reached && !is_legacy(rate))
3104 rate->index = prev_rate_idx;
3105
3106 *rs_table_index = index;
3107 }
3108
3109 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3110 * column the rate table should look like this:
3111 *
3112 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3113 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3114 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3115 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3116 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3117 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3118 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3119 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3120 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3121 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3122 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3123 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3124 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3125 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3126 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3127 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3128 */
3129 static void rs_build_rates_table(struct iwl_mvm *mvm,
3130 struct ieee80211_sta *sta,
3131 struct iwl_lq_sta *lq_sta,
3132 const struct rs_rate *initial_rate)
3133 {
3134 struct rs_rate rate;
3135 int num_rates, num_retries, index = 0;
3136 u8 valid_tx_ant = 0;
3137 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3138 bool toggle_ant = false;
3139
3140 memcpy(&rate, initial_rate, sizeof(rate));
3141
3142 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3143
3144 /* TODO: remove old API when min FW API hits 14 */
3145 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3146 rs_stbc_allow(mvm, sta, lq_sta))
3147 rate.stbc = true;
3148
3149 if (is_siso(&rate)) {
3150 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3151 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3152 } else if (is_mimo(&rate)) {
3153 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3154 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3155 } else {
3156 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3157 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3158 toggle_ant = true;
3159 }
3160
3161 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3162 num_rates, num_retries, valid_tx_ant,
3163 toggle_ant);
3164
3165 rs_get_lower_rate_down_column(lq_sta, &rate);
3166
3167 if (is_siso(&rate)) {
3168 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3169 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3170 lq_cmd->mimo_delim = index;
3171 } else if (is_legacy(&rate)) {
3172 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3173 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3174 } else {
3175 WARN_ON_ONCE(1);
3176 }
3177
3178 toggle_ant = true;
3179
3180 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3181 num_rates, num_retries, valid_tx_ant,
3182 toggle_ant);
3183
3184 rs_get_lower_rate_down_column(lq_sta, &rate);
3185
3186 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3187 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3188
3189 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3190 num_rates, num_retries, valid_tx_ant,
3191 toggle_ant);
3192
3193 }
3194
3195 struct rs_bfer_active_iter_data {
3196 struct ieee80211_sta *exclude_sta;
3197 struct iwl_mvm_sta *bfer_mvmsta;
3198 };
3199
3200 static void rs_bfer_active_iter(void *_data,
3201 struct ieee80211_sta *sta)
3202 {
3203 struct rs_bfer_active_iter_data *data = _data;
3204 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3205 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3206 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3207
3208 if (sta == data->exclude_sta)
3209 return;
3210
3211 /* The current sta has BFER allowed */
3212 if (ss_params & LQ_SS_BFER_ALLOWED) {
3213 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3214
3215 data->bfer_mvmsta = mvmsta;
3216 }
3217 }
3218
3219 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3220 {
3221 int prio = -1;
3222 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3223
3224 switch (viftype) {
3225 case NL80211_IFTYPE_AP:
3226 case NL80211_IFTYPE_P2P_GO:
3227 prio = 3;
3228 break;
3229 case NL80211_IFTYPE_P2P_CLIENT:
3230 prio = 2;
3231 break;
3232 case NL80211_IFTYPE_STATION:
3233 prio = 1;
3234 break;
3235 default:
3236 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3237 prio = -1;
3238 }
3239
3240 return prio;
3241 }
3242
3243 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3244 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3245 struct iwl_mvm_sta *sta2)
3246 {
3247 int prio1 = rs_bfer_priority(sta1);
3248 int prio2 = rs_bfer_priority(sta2);
3249
3250 if (prio1 > prio2)
3251 return 1;
3252 if (prio1 < prio2)
3253 return -1;
3254 return 0;
3255 }
3256
3257 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3258 struct ieee80211_sta *sta,
3259 struct iwl_lq_sta *lq_sta,
3260 const struct rs_rate *initial_rate)
3261 {
3262 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3263 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3264 struct rs_bfer_active_iter_data data = {
3265 .exclude_sta = sta,
3266 .bfer_mvmsta = NULL,
3267 };
3268 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3269 u32 ss_params = LQ_SS_PARAMS_VALID;
3270
3271 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3272 goto out;
3273
3274 #ifdef CONFIG_MAC80211_DEBUGFS
3275 /* Check if forcing the decision is configured.
3276 * Note that SISO is forced by not allowing STBC or BFER
3277 */
3278 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3279 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3280 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3281 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3282
3283 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3284 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3285 lq_sta->pers.ss_force);
3286 goto out;
3287 }
3288 #endif
3289
3290 if (lq_sta->stbc_capable)
3291 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3292
3293 if (!lq_sta->bfer_capable)
3294 goto out;
3295
3296 ieee80211_iterate_stations_atomic(mvm->hw,
3297 rs_bfer_active_iter,
3298 &data);
3299 bfer_mvmsta = data.bfer_mvmsta;
3300
3301 /* This code is safe as it doesn't run concurrently for different
3302 * stations. This is guaranteed by the fact that calls to
3303 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3304 */
3305 if (!bfer_mvmsta) {
3306 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3307
3308 ss_params |= LQ_SS_BFER_ALLOWED;
3309 goto out;
3310 }
3311
3312 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3313 bfer_mvmsta->sta_id);
3314
3315 /* Disallow BFER on another STA if active and we're a higher priority */
3316 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3317 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3318 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3319
3320 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3321 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3322 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3323
3324 ss_params |= LQ_SS_BFER_ALLOWED;
3325 IWL_DEBUG_RATE(mvm,
3326 "Lower priority BFER sta found (%d). Switch BFER\n",
3327 bfer_mvmsta->sta_id);
3328 }
3329 out:
3330 lq_cmd->ss_params = cpu_to_le32(ss_params);
3331 }
3332
3333 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3334 struct ieee80211_sta *sta,
3335 struct iwl_lq_sta *lq_sta,
3336 const struct rs_rate *initial_rate)
3337 {
3338 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3339 struct iwl_mvm_sta *mvmsta;
3340 struct iwl_mvm_vif *mvmvif;
3341
3342 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3343 lq_cmd->agg_time_limit =
3344 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3345
3346 #ifdef CONFIG_MAC80211_DEBUGFS
3347 if (lq_sta->pers.dbg_fixed_rate) {
3348 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3349 lq_sta->band,
3350 lq_sta->pers.dbg_fixed_rate);
3351 return;
3352 }
3353 #endif
3354 if (WARN_ON_ONCE(!sta || !initial_rate))
3355 return;
3356
3357 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3358
3359 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3360 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3361
3362 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3363 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3364
3365 if (num_of_ant(initial_rate->ant) == 1)
3366 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3367
3368 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3369
3370 /*
3371 * In case of low latency, tell the firmware to leave a frame in the
3372 * Tx Fifo so that it can start a transaction in the same TxOP. This
3373 * basically allows the firmware to send bursts.
3374 */
3375 if (iwl_mvm_vif_low_latency(mvmvif)) {
3376 lq_cmd->agg_frame_cnt_limit--;
3377
3378 if (mvm->low_latency_agg_frame_limit)
3379 lq_cmd->agg_frame_cnt_limit =
3380 min(lq_cmd->agg_frame_cnt_limit,
3381 mvm->low_latency_agg_frame_limit);
3382 }
3383
3384 if (mvmsta->vif->p2p)
3385 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3386
3387 lq_cmd->agg_time_limit =
3388 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3389 }
3390
3391 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3392 {
3393 return hw->priv;
3394 }
3395 /* rate scale requires free function to be implemented */
3396 static void rs_free(void *mvm_rate)
3397 {
3398 return;
3399 }
3400
3401 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3402 void *mvm_sta)
3403 {
3404 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3405 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3406
3407 IWL_DEBUG_RATE(mvm, "enter\n");
3408 IWL_DEBUG_RATE(mvm, "leave\n");
3409 }
3410
3411 #ifdef CONFIG_MAC80211_DEBUGFS
3412 int rs_pretty_print_rate(char *buf, const u32 rate)
3413 {
3414
3415 char *type, *bw;
3416 u8 mcs = 0, nss = 0;
3417 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3418
3419 if (!(rate & RATE_MCS_HT_MSK) &&
3420 !(rate & RATE_MCS_VHT_MSK)) {
3421 int index = iwl_hwrate_to_plcp_idx(rate);
3422
3423 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3424 rs_pretty_ant(ant),
3425 index == IWL_RATE_INVALID ? "BAD" :
3426 iwl_rate_mcs[index].mbps);
3427 }
3428
3429 if (rate & RATE_MCS_VHT_MSK) {
3430 type = "VHT";
3431 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3432 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3433 >> RATE_VHT_MCS_NSS_POS) + 1;
3434 } else if (rate & RATE_MCS_HT_MSK) {
3435 type = "HT";
3436 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3437 } else {
3438 type = "Unknown"; /* shouldn't happen */
3439 }
3440
3441 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3442 case RATE_MCS_CHAN_WIDTH_20:
3443 bw = "20Mhz";
3444 break;
3445 case RATE_MCS_CHAN_WIDTH_40:
3446 bw = "40Mhz";
3447 break;
3448 case RATE_MCS_CHAN_WIDTH_80:
3449 bw = "80Mhz";
3450 break;
3451 case RATE_MCS_CHAN_WIDTH_160:
3452 bw = "160Mhz";
3453 break;
3454 default:
3455 bw = "BAD BW";
3456 }
3457
3458 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3459 type, rs_pretty_ant(ant), bw, mcs, nss,
3460 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3461 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3462 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3463 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3464 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3465 }
3466
3467 /**
3468 * Program the device to use fixed rate for frame transmit
3469 * This is for debugging/testing only
3470 * once the device start use fixed rate, we need to reload the module
3471 * to being back the normal operation.
3472 */
3473 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3474 struct iwl_lq_sta *lq_sta)
3475 {
3476 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3477 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3478 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3479
3480 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3481 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3482
3483 if (lq_sta->pers.dbg_fixed_rate) {
3484 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3485 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3486 }
3487 }
3488
3489 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3490 const char __user *user_buf, size_t count, loff_t *ppos)
3491 {
3492 struct iwl_lq_sta *lq_sta = file->private_data;
3493 struct iwl_mvm *mvm;
3494 char buf[64];
3495 size_t buf_size;
3496 u32 parsed_rate;
3497
3498 mvm = lq_sta->pers.drv;
3499 memset(buf, 0, sizeof(buf));
3500 buf_size = min(count, sizeof(buf) - 1);
3501 if (copy_from_user(buf, user_buf, buf_size))
3502 return -EFAULT;
3503
3504 if (sscanf(buf, "%x", &parsed_rate) == 1)
3505 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3506 else
3507 lq_sta->pers.dbg_fixed_rate = 0;
3508
3509 rs_program_fix_rate(mvm, lq_sta);
3510
3511 return count;
3512 }
3513
3514 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3515 char __user *user_buf, size_t count, loff_t *ppos)
3516 {
3517 char *buff;
3518 int desc = 0;
3519 int i = 0;
3520 ssize_t ret;
3521
3522 struct iwl_lq_sta *lq_sta = file->private_data;
3523 struct iwl_mvm *mvm;
3524 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3525 struct rs_rate *rate = &tbl->rate;
3526 u32 ss_params;
3527 mvm = lq_sta->pers.drv;
3528 buff = kmalloc(2048, GFP_KERNEL);
3529 if (!buff)
3530 return -ENOMEM;
3531
3532 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3533 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3534 lq_sta->total_failed, lq_sta->total_success,
3535 lq_sta->active_legacy_rate);
3536 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3537 lq_sta->pers.dbg_fixed_rate);
3538 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3539 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3540 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3541 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3542 desc += sprintf(buff+desc, "lq type %s\n",
3543 (is_legacy(rate)) ? "legacy" :
3544 is_vht(rate) ? "VHT" : "HT");
3545 if (!is_legacy(rate)) {
3546 desc += sprintf(buff + desc, " %s",
3547 (is_siso(rate)) ? "SISO" : "MIMO2");
3548 desc += sprintf(buff + desc, " %s",
3549 (is_ht20(rate)) ? "20MHz" :
3550 (is_ht40(rate)) ? "40MHz" :
3551 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3552 desc += sprintf(buff + desc, " %s %s %s\n",
3553 (rate->sgi) ? "SGI" : "NGI",
3554 (rate->ldpc) ? "LDPC" : "BCC",
3555 (lq_sta->is_agg) ? "AGG on" : "");
3556 }
3557 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3558 lq_sta->last_rate_n_flags);
3559 desc += sprintf(buff+desc,
3560 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3561 lq_sta->lq.flags,
3562 lq_sta->lq.mimo_delim,
3563 lq_sta->lq.single_stream_ant_msk,
3564 lq_sta->lq.dual_stream_ant_msk);
3565
3566 desc += sprintf(buff+desc,
3567 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3568 le16_to_cpu(lq_sta->lq.agg_time_limit),
3569 lq_sta->lq.agg_disable_start_th,
3570 lq_sta->lq.agg_frame_cnt_limit);
3571
3572 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3573 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3574 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3575 (ss_params & LQ_SS_PARAMS_VALID) ?
3576 "VALID" : "INVALID",
3577 (ss_params & LQ_SS_BFER_ALLOWED) ?
3578 ", BFER" : "",
3579 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3580 ", STBC" : "",
3581 (ss_params & LQ_SS_FORCE) ?
3582 ", FORCE" : "");
3583 desc += sprintf(buff+desc,
3584 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3585 lq_sta->lq.initial_rate_index[0],
3586 lq_sta->lq.initial_rate_index[1],
3587 lq_sta->lq.initial_rate_index[2],
3588 lq_sta->lq.initial_rate_index[3]);
3589
3590 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3591 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3592
3593 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3594 desc += rs_pretty_print_rate(buff+desc, r);
3595 }
3596
3597 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3598 kfree(buff);
3599 return ret;
3600 }
3601
3602 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3603 .write = rs_sta_dbgfs_scale_table_write,
3604 .read = rs_sta_dbgfs_scale_table_read,
3605 .open = simple_open,
3606 .llseek = default_llseek,
3607 };
3608 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3609 char __user *user_buf, size_t count, loff_t *ppos)
3610 {
3611 char *buff;
3612 int desc = 0;
3613 int i, j;
3614 ssize_t ret;
3615 struct iwl_scale_tbl_info *tbl;
3616 struct rs_rate *rate;
3617 struct iwl_lq_sta *lq_sta = file->private_data;
3618
3619 buff = kmalloc(1024, GFP_KERNEL);
3620 if (!buff)
3621 return -ENOMEM;
3622
3623 for (i = 0; i < LQ_SIZE; i++) {
3624 tbl = &(lq_sta->lq_info[i]);
3625 rate = &tbl->rate;
3626 desc += sprintf(buff+desc,
3627 "%s type=%d SGI=%d BW=%s DUP=0\n"
3628 "index=%d\n",
3629 lq_sta->active_tbl == i ? "*" : "x",
3630 rate->type,
3631 rate->sgi,
3632 is_ht20(rate) ? "20Mhz" :
3633 is_ht40(rate) ? "40Mhz" :
3634 is_ht80(rate) ? "80Mhz" : "ERR",
3635 rate->index);
3636 for (j = 0; j < IWL_RATE_COUNT; j++) {
3637 desc += sprintf(buff+desc,
3638 "counter=%d success=%d %%=%d\n",
3639 tbl->win[j].counter,
3640 tbl->win[j].success_counter,
3641 tbl->win[j].success_ratio);
3642 }
3643 }
3644 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3645 kfree(buff);
3646 return ret;
3647 }
3648
3649 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3650 .read = rs_sta_dbgfs_stats_table_read,
3651 .open = simple_open,
3652 .llseek = default_llseek,
3653 };
3654
3655 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3656 char __user *user_buf,
3657 size_t count, loff_t *ppos)
3658 {
3659 static const char * const column_name[] = {
3660 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3661 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3662 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3663 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3664 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3665 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3666 [RS_COLUMN_MIMO2] = "MIMO2",
3667 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3668 };
3669
3670 static const char * const rate_name[] = {
3671 [IWL_RATE_1M_INDEX] = "1M",
3672 [IWL_RATE_2M_INDEX] = "2M",
3673 [IWL_RATE_5M_INDEX] = "5.5M",
3674 [IWL_RATE_11M_INDEX] = "11M",
3675 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3676 [IWL_RATE_9M_INDEX] = "9M",
3677 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3678 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3679 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3680 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3681 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3682 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3683 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3684 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3685 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3686 };
3687
3688 char *buff, *pos, *endpos;
3689 int col, rate;
3690 ssize_t ret;
3691 struct iwl_lq_sta *lq_sta = file->private_data;
3692 struct rs_rate_stats *stats;
3693 static const size_t bufsz = 1024;
3694
3695 buff = kmalloc(bufsz, GFP_KERNEL);
3696 if (!buff)
3697 return -ENOMEM;
3698
3699 pos = buff;
3700 endpos = pos + bufsz;
3701
3702 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3703 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3704 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3705 pos += scnprintf(pos, endpos - pos, "\n");
3706
3707 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3708 pos += scnprintf(pos, endpos - pos,
3709 "%s,", column_name[col]);
3710
3711 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3712 stats = &(lq_sta->pers.tx_stats[col][rate]);
3713 pos += scnprintf(pos, endpos - pos,
3714 "%llu/%llu,",
3715 stats->success,
3716 stats->total);
3717 }
3718 pos += scnprintf(pos, endpos - pos, "\n");
3719 }
3720
3721 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3722 kfree(buff);
3723 return ret;
3724 }
3725
3726 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3727 const char __user *user_buf,
3728 size_t count, loff_t *ppos)
3729 {
3730 struct iwl_lq_sta *lq_sta = file->private_data;
3731 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3732
3733 return count;
3734 }
3735
3736 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3737 .read = rs_sta_dbgfs_drv_tx_stats_read,
3738 .write = rs_sta_dbgfs_drv_tx_stats_write,
3739 .open = simple_open,
3740 .llseek = default_llseek,
3741 };
3742
3743 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3744 char __user *user_buf,
3745 size_t count, loff_t *ppos)
3746 {
3747 struct iwl_lq_sta *lq_sta = file->private_data;
3748 char buf[12];
3749 int bufsz = sizeof(buf);
3750 int pos = 0;
3751 static const char * const ss_force_name[] = {
3752 [RS_SS_FORCE_NONE] = "none",
3753 [RS_SS_FORCE_STBC] = "stbc",
3754 [RS_SS_FORCE_BFER] = "bfer",
3755 [RS_SS_FORCE_SISO] = "siso",
3756 };
3757
3758 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3759 ss_force_name[lq_sta->pers.ss_force]);
3760 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3761 }
3762
3763 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3764 size_t count, loff_t *ppos)
3765 {
3766 struct iwl_mvm *mvm = lq_sta->pers.drv;
3767 int ret = 0;
3768
3769 if (!strncmp("none", buf, 4)) {
3770 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3771 } else if (!strncmp("siso", buf, 4)) {
3772 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3773 } else if (!strncmp("stbc", buf, 4)) {
3774 if (lq_sta->stbc_capable) {
3775 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3776 } else {
3777 IWL_ERR(mvm,
3778 "can't force STBC. peer doesn't support\n");
3779 ret = -EINVAL;
3780 }
3781 } else if (!strncmp("bfer", buf, 4)) {
3782 if (lq_sta->bfer_capable) {
3783 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3784 } else {
3785 IWL_ERR(mvm,
3786 "can't force BFER. peer doesn't support\n");
3787 ret = -EINVAL;
3788 }
3789 } else {
3790 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3791 ret = -EINVAL;
3792 }
3793 return ret ?: count;
3794 }
3795
3796 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3797 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3798 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3799 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3800 &iwl_dbgfs_##name##_ops)) \
3801 goto err; \
3802 } while (0)
3803
3804 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3805
3806 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3807 {
3808 struct iwl_lq_sta *lq_sta = priv_sta;
3809 struct iwl_mvm_sta *mvmsta;
3810
3811 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3812
3813 if (!mvmsta->vif)
3814 return;
3815
3816 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3817 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3818 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3819 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3820 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3821 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3822 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3823 &lq_sta->tx_agg_tid_en);
3824 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3825 &lq_sta->pers.dbg_fixed_txp_reduction);
3826
3827 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3828 return;
3829 err:
3830 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3831 }
3832
3833 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3834 {
3835 }
3836 #endif
3837
3838 /*
3839 * Initialization of rate scaling information is done by driver after
3840 * the station is added. Since mac80211 calls this function before a
3841 * station is added we ignore it.
3842 */
3843 static void rs_rate_init_stub(void *mvm_r,
3844 struct ieee80211_supported_band *sband,
3845 struct cfg80211_chan_def *chandef,
3846 struct ieee80211_sta *sta, void *mvm_sta)
3847 {
3848 }
3849
3850 static const struct rate_control_ops rs_mvm_ops = {
3851 .name = RS_NAME,
3852 .tx_status = rs_mac80211_tx_status,
3853 .get_rate = rs_get_rate,
3854 .rate_init = rs_rate_init_stub,
3855 .alloc = rs_alloc,
3856 .free = rs_free,
3857 .alloc_sta = rs_alloc_sta,
3858 .free_sta = rs_free_sta,
3859 .rate_update = rs_rate_update,
3860 #ifdef CONFIG_MAC80211_DEBUGFS
3861 .add_sta_debugfs = rs_add_debugfs,
3862 .remove_sta_debugfs = rs_remove_debugfs,
3863 #endif
3864 };
3865
3866 int iwl_mvm_rate_control_register(void)
3867 {
3868 return ieee80211_rate_control_register(&rs_mvm_ops);
3869 }
3870
3871 void iwl_mvm_rate_control_unregister(void)
3872 {
3873 ieee80211_rate_control_unregister(&rs_mvm_ops);
3874 }
3875
3876 /**
3877 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3878 * Tx protection, according to this request and previous requests,
3879 * and send the LQ command.
3880 * @mvmsta: The station
3881 * @enable: Enable Tx protection?
3882 */
3883 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3884 bool enable)
3885 {
3886 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3887
3888 lockdep_assert_held(&mvm->mutex);
3889
3890 if (enable) {
3891 if (mvmsta->tx_protection == 0)
3892 lq->flags |= LQ_FLAG_USE_RTS_MSK;
3893 mvmsta->tx_protection++;
3894 } else {
3895 mvmsta->tx_protection--;
3896 if (mvmsta->tx_protection == 0)
3897 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3898 }
3899
3900 return iwl_mvm_send_lq_cmd(mvm, lq, false);
3901 }
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