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[deliverable/linux.git] / drivers / net / wireless / intel / iwlwifi / mvm / rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
5 * Copyright(c) 2016 Intel Deutschland GmbH
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
19 *
20 * The full GNU General Public License is included in this distribution in the
21 * file called LICENSE.
22 *
23 * Contact Information:
24 * Intel Linux Wireless <linuxwifi@intel.com>
25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26 *
27 *****************************************************************************/
28 #include <linux/kernel.h>
29 #include <linux/skbuff.h>
30 #include <linux/slab.h>
31 #include <net/mac80211.h>
32
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
36
37 #include <linux/workqueue.h>
38 #include "rs.h"
39 #include "fw-api.h"
40 #include "sta.h"
41 #include "iwl-op-mode.h"
42 #include "mvm.h"
43 #include "debugfs.h"
44
45 #define RS_NAME "iwl-mvm-rs"
46
47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
48
49 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
50 * Use this macro when dealing with thresholds consts set as a percentage
51 */
52 #define RS_PERCENT(x) (128 * x)
53
54 static u8 rs_ht_to_legacy[] = {
55 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
56 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
57 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
58 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
59 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
60 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
61 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
62 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
64 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
65 };
66
67 static const u8 ant_toggle_lookup[] = {
68 [ANT_NONE] = ANT_NONE,
69 [ANT_A] = ANT_B,
70 [ANT_B] = ANT_C,
71 [ANT_AB] = ANT_BC,
72 [ANT_C] = ANT_A,
73 [ANT_AC] = ANT_AB,
74 [ANT_BC] = ANT_AC,
75 [ANT_ABC] = ANT_ABC,
76 };
77
78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
84 IWL_RATE_##rp##M_INDEX, \
85 IWL_RATE_##rn##M_INDEX }
86
87 #define IWL_DECLARE_MCS_RATE(s) \
88 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
89 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
90 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
92 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
93 IWL_RATE_INVM_INDEX, \
94 IWL_RATE_INVM_INDEX }
95
96 /*
97 * Parameter order:
98 * rate, ht rate, prev rate, next rate
99 *
100 * If there isn't a valid next or previous rate then INV is used which
101 * maps to IWL_RATE_INVALID
102 *
103 */
104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
105 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
106 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
107 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
108 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
109 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
110 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
111 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
112 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
113 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
114 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
115 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
116 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
117 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
118 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
119 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
120 };
121
122 enum rs_action {
123 RS_ACTION_STAY = 0,
124 RS_ACTION_DOWNSCALE = -1,
125 RS_ACTION_UPSCALE = 1,
126 };
127
128 enum rs_column_mode {
129 RS_INVALID = 0,
130 RS_LEGACY,
131 RS_SISO,
132 RS_MIMO2,
133 };
134
135 #define MAX_NEXT_COLUMNS 7
136 #define MAX_COLUMN_CHECKS 3
137
138 struct rs_tx_column;
139
140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
141 struct ieee80211_sta *sta,
142 struct rs_rate *rate,
143 const struct rs_tx_column *next_col);
144
145 struct rs_tx_column {
146 enum rs_column_mode mode;
147 u8 ant;
148 bool sgi;
149 enum rs_column next_columns[MAX_NEXT_COLUMNS];
150 allow_column_func_t checks[MAX_COLUMN_CHECKS];
151 };
152
153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
154 struct rs_rate *rate,
155 const struct rs_tx_column *next_col)
156 {
157 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
158 }
159
160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
161 struct rs_rate *rate,
162 const struct rs_tx_column *next_col)
163 {
164 struct iwl_mvm_sta *mvmsta;
165 struct iwl_mvm_vif *mvmvif;
166
167 if (!sta->ht_cap.ht_supported)
168 return false;
169
170 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
171 return false;
172
173 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
174 return false;
175
176 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
177 return false;
178
179 mvmsta = iwl_mvm_sta_from_mac80211(sta);
180 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
181
182 if (mvm->nvm_data->sku_cap_mimo_disabled)
183 return false;
184
185 return true;
186 }
187
188 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
189 struct rs_rate *rate,
190 const struct rs_tx_column *next_col)
191 {
192 if (!sta->ht_cap.ht_supported)
193 return false;
194
195 return true;
196 }
197
198 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
199 struct rs_rate *rate,
200 const struct rs_tx_column *next_col)
201 {
202 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
203 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
204
205 if (is_ht20(rate) && (ht_cap->cap &
206 IEEE80211_HT_CAP_SGI_20))
207 return true;
208 if (is_ht40(rate) && (ht_cap->cap &
209 IEEE80211_HT_CAP_SGI_40))
210 return true;
211 if (is_ht80(rate) && (vht_cap->cap &
212 IEEE80211_VHT_CAP_SHORT_GI_80))
213 return true;
214
215 return false;
216 }
217
218 static const struct rs_tx_column rs_tx_columns[] = {
219 [RS_COLUMN_LEGACY_ANT_A] = {
220 .mode = RS_LEGACY,
221 .ant = ANT_A,
222 .next_columns = {
223 RS_COLUMN_LEGACY_ANT_B,
224 RS_COLUMN_SISO_ANT_A,
225 RS_COLUMN_MIMO2,
226 RS_COLUMN_INVALID,
227 RS_COLUMN_INVALID,
228 RS_COLUMN_INVALID,
229 RS_COLUMN_INVALID,
230 },
231 .checks = {
232 rs_ant_allow,
233 },
234 },
235 [RS_COLUMN_LEGACY_ANT_B] = {
236 .mode = RS_LEGACY,
237 .ant = ANT_B,
238 .next_columns = {
239 RS_COLUMN_LEGACY_ANT_A,
240 RS_COLUMN_SISO_ANT_B,
241 RS_COLUMN_MIMO2,
242 RS_COLUMN_INVALID,
243 RS_COLUMN_INVALID,
244 RS_COLUMN_INVALID,
245 RS_COLUMN_INVALID,
246 },
247 .checks = {
248 rs_ant_allow,
249 },
250 },
251 [RS_COLUMN_SISO_ANT_A] = {
252 .mode = RS_SISO,
253 .ant = ANT_A,
254 .next_columns = {
255 RS_COLUMN_SISO_ANT_B,
256 RS_COLUMN_MIMO2,
257 RS_COLUMN_SISO_ANT_A_SGI,
258 RS_COLUMN_LEGACY_ANT_A,
259 RS_COLUMN_LEGACY_ANT_B,
260 RS_COLUMN_INVALID,
261 RS_COLUMN_INVALID,
262 },
263 .checks = {
264 rs_siso_allow,
265 rs_ant_allow,
266 },
267 },
268 [RS_COLUMN_SISO_ANT_B] = {
269 .mode = RS_SISO,
270 .ant = ANT_B,
271 .next_columns = {
272 RS_COLUMN_SISO_ANT_A,
273 RS_COLUMN_MIMO2,
274 RS_COLUMN_SISO_ANT_B_SGI,
275 RS_COLUMN_LEGACY_ANT_A,
276 RS_COLUMN_LEGACY_ANT_B,
277 RS_COLUMN_INVALID,
278 RS_COLUMN_INVALID,
279 },
280 .checks = {
281 rs_siso_allow,
282 rs_ant_allow,
283 },
284 },
285 [RS_COLUMN_SISO_ANT_A_SGI] = {
286 .mode = RS_SISO,
287 .ant = ANT_A,
288 .sgi = true,
289 .next_columns = {
290 RS_COLUMN_SISO_ANT_B_SGI,
291 RS_COLUMN_MIMO2_SGI,
292 RS_COLUMN_SISO_ANT_A,
293 RS_COLUMN_LEGACY_ANT_A,
294 RS_COLUMN_LEGACY_ANT_B,
295 RS_COLUMN_INVALID,
296 RS_COLUMN_INVALID,
297 },
298 .checks = {
299 rs_siso_allow,
300 rs_ant_allow,
301 rs_sgi_allow,
302 },
303 },
304 [RS_COLUMN_SISO_ANT_B_SGI] = {
305 .mode = RS_SISO,
306 .ant = ANT_B,
307 .sgi = true,
308 .next_columns = {
309 RS_COLUMN_SISO_ANT_A_SGI,
310 RS_COLUMN_MIMO2_SGI,
311 RS_COLUMN_SISO_ANT_B,
312 RS_COLUMN_LEGACY_ANT_A,
313 RS_COLUMN_LEGACY_ANT_B,
314 RS_COLUMN_INVALID,
315 RS_COLUMN_INVALID,
316 },
317 .checks = {
318 rs_siso_allow,
319 rs_ant_allow,
320 rs_sgi_allow,
321 },
322 },
323 [RS_COLUMN_MIMO2] = {
324 .mode = RS_MIMO2,
325 .ant = ANT_AB,
326 .next_columns = {
327 RS_COLUMN_SISO_ANT_A,
328 RS_COLUMN_MIMO2_SGI,
329 RS_COLUMN_LEGACY_ANT_A,
330 RS_COLUMN_LEGACY_ANT_B,
331 RS_COLUMN_INVALID,
332 RS_COLUMN_INVALID,
333 RS_COLUMN_INVALID,
334 },
335 .checks = {
336 rs_mimo_allow,
337 },
338 },
339 [RS_COLUMN_MIMO2_SGI] = {
340 .mode = RS_MIMO2,
341 .ant = ANT_AB,
342 .sgi = true,
343 .next_columns = {
344 RS_COLUMN_SISO_ANT_A_SGI,
345 RS_COLUMN_MIMO2,
346 RS_COLUMN_LEGACY_ANT_A,
347 RS_COLUMN_LEGACY_ANT_B,
348 RS_COLUMN_INVALID,
349 RS_COLUMN_INVALID,
350 RS_COLUMN_INVALID,
351 },
352 .checks = {
353 rs_mimo_allow,
354 rs_sgi_allow,
355 },
356 },
357 };
358
359 static inline u8 rs_extract_rate(u32 rate_n_flags)
360 {
361 /* also works for HT because bits 7:6 are zero there */
362 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
363 }
364
365 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
366 {
367 int idx = 0;
368
369 if (rate_n_flags & RATE_MCS_HT_MSK) {
370 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
371 idx += IWL_RATE_MCS_0_INDEX;
372
373 /* skip 9M not supported in HT*/
374 if (idx >= IWL_RATE_9M_INDEX)
375 idx += 1;
376 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
377 return idx;
378 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
379 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
380 idx += IWL_RATE_MCS_0_INDEX;
381
382 /* skip 9M not supported in VHT*/
383 if (idx >= IWL_RATE_9M_INDEX)
384 idx++;
385 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
386 return idx;
387 } else {
388 /* legacy rate format, search for match in table */
389
390 u8 legacy_rate = rs_extract_rate(rate_n_flags);
391 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
392 if (iwl_rates[idx].plcp == legacy_rate)
393 return idx;
394 }
395
396 return IWL_RATE_INVALID;
397 }
398
399 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
400 struct ieee80211_sta *sta,
401 struct iwl_lq_sta *lq_sta,
402 int tid);
403 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
404 struct ieee80211_sta *sta,
405 struct iwl_lq_sta *lq_sta,
406 const struct rs_rate *initial_rate);
407 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
408
409 /**
410 * The following tables contain the expected throughput metrics for all rates
411 *
412 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
413 *
414 * where invalid entries are zeros.
415 *
416 * CCK rates are only valid in legacy table and will only be used in G
417 * (2.4 GHz) band.
418 */
419
420 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
421 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
422 };
423
424 /* Expected TpT tables. 4 indexes:
425 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
426 */
427 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
428 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
429 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
430 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
431 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
432 };
433
434 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
435 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
436 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
437 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
438 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
439 };
440
441 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
442 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
443 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
444 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
445 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
446 };
447
448 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
449 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
450 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
451 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
452 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
453 };
454
455 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
456 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
457 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
458 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
459 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
460 };
461
462 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
463 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
464 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
465 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
466 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
467 };
468
469 /* mbps, mcs */
470 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
471 { "1", "BPSK DSSS"},
472 { "2", "QPSK DSSS"},
473 {"5.5", "BPSK CCK"},
474 { "11", "QPSK CCK"},
475 { "6", "BPSK 1/2"},
476 { "9", "BPSK 1/2"},
477 { "12", "QPSK 1/2"},
478 { "18", "QPSK 3/4"},
479 { "24", "16QAM 1/2"},
480 { "36", "16QAM 3/4"},
481 { "48", "64QAM 2/3"},
482 { "54", "64QAM 3/4"},
483 { "60", "64QAM 5/6"},
484 };
485
486 #define MCS_INDEX_PER_STREAM (8)
487
488 static const char *rs_pretty_ant(u8 ant)
489 {
490 static const char * const ant_name[] = {
491 [ANT_NONE] = "None",
492 [ANT_A] = "A",
493 [ANT_B] = "B",
494 [ANT_AB] = "AB",
495 [ANT_C] = "C",
496 [ANT_AC] = "AC",
497 [ANT_BC] = "BC",
498 [ANT_ABC] = "ABC",
499 };
500
501 if (ant > ANT_ABC)
502 return "UNKNOWN";
503
504 return ant_name[ant];
505 }
506
507 static const char *rs_pretty_lq_type(enum iwl_table_type type)
508 {
509 static const char * const lq_types[] = {
510 [LQ_NONE] = "NONE",
511 [LQ_LEGACY_A] = "LEGACY_A",
512 [LQ_LEGACY_G] = "LEGACY_G",
513 [LQ_HT_SISO] = "HT SISO",
514 [LQ_HT_MIMO2] = "HT MIMO",
515 [LQ_VHT_SISO] = "VHT SISO",
516 [LQ_VHT_MIMO2] = "VHT MIMO",
517 };
518
519 if (type < LQ_NONE || type >= LQ_MAX)
520 return "UNKNOWN";
521
522 return lq_types[type];
523 }
524
525 static char *rs_pretty_rate(const struct rs_rate *rate)
526 {
527 static char buf[40];
528 static const char * const legacy_rates[] = {
529 [IWL_RATE_1M_INDEX] = "1M",
530 [IWL_RATE_2M_INDEX] = "2M",
531 [IWL_RATE_5M_INDEX] = "5.5M",
532 [IWL_RATE_11M_INDEX] = "11M",
533 [IWL_RATE_6M_INDEX] = "6M",
534 [IWL_RATE_9M_INDEX] = "9M",
535 [IWL_RATE_12M_INDEX] = "12M",
536 [IWL_RATE_18M_INDEX] = "18M",
537 [IWL_RATE_24M_INDEX] = "24M",
538 [IWL_RATE_36M_INDEX] = "36M",
539 [IWL_RATE_48M_INDEX] = "48M",
540 [IWL_RATE_54M_INDEX] = "54M",
541 };
542 static const char *const ht_vht_rates[] = {
543 [IWL_RATE_MCS_0_INDEX] = "MCS0",
544 [IWL_RATE_MCS_1_INDEX] = "MCS1",
545 [IWL_RATE_MCS_2_INDEX] = "MCS2",
546 [IWL_RATE_MCS_3_INDEX] = "MCS3",
547 [IWL_RATE_MCS_4_INDEX] = "MCS4",
548 [IWL_RATE_MCS_5_INDEX] = "MCS5",
549 [IWL_RATE_MCS_6_INDEX] = "MCS6",
550 [IWL_RATE_MCS_7_INDEX] = "MCS7",
551 [IWL_RATE_MCS_8_INDEX] = "MCS8",
552 [IWL_RATE_MCS_9_INDEX] = "MCS9",
553 };
554 const char *rate_str;
555
556 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
557 rate_str = legacy_rates[rate->index];
558 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
559 (rate->index <= IWL_RATE_MCS_9_INDEX))
560 rate_str = ht_vht_rates[rate->index];
561 else
562 rate_str = "BAD_RATE";
563
564 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
565 rs_pretty_ant(rate->ant), rate_str);
566 return buf;
567 }
568
569 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
570 const char *prefix)
571 {
572 IWL_DEBUG_RATE(mvm,
573 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
574 prefix, rs_pretty_rate(rate), rate->bw,
575 rate->sgi, rate->ldpc, rate->stbc);
576 }
577
578 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
579 {
580 window->data = 0;
581 window->success_counter = 0;
582 window->success_ratio = IWL_INVALID_VALUE;
583 window->counter = 0;
584 window->average_tpt = IWL_INVALID_VALUE;
585 }
586
587 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
588 struct iwl_scale_tbl_info *tbl)
589 {
590 int i;
591
592 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
593 for (i = 0; i < IWL_RATE_COUNT; i++)
594 rs_rate_scale_clear_window(&tbl->win[i]);
595
596 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
597 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
598 }
599
600 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
601 {
602 return (ant_type & valid_antenna) == ant_type;
603 }
604
605 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
606 struct iwl_lq_sta *lq_data, u8 tid,
607 struct ieee80211_sta *sta)
608 {
609 int ret = -EAGAIN;
610
611 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
612 sta->addr, tid);
613 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
614 if (ret == -EAGAIN) {
615 /*
616 * driver and mac80211 is out of sync
617 * this might be cause by reloading firmware
618 * stop the tx ba session here
619 */
620 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
621 tid);
622 ieee80211_stop_tx_ba_session(sta, tid);
623 }
624 return ret;
625 }
626
627 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
628 struct iwl_lq_sta *lq_data,
629 struct ieee80211_sta *sta)
630 {
631 if (tid < IWL_MAX_TID_COUNT)
632 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
633 else
634 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
635 tid, IWL_MAX_TID_COUNT);
636 }
637
638 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
639 {
640 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
641 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
642 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
643 }
644
645 /*
646 * Static function to get the expected throughput from an iwl_scale_tbl_info
647 * that wraps a NULL pointer check
648 */
649 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
650 {
651 if (tbl->expected_tpt)
652 return tbl->expected_tpt[rs_index];
653 return 0;
654 }
655
656 /**
657 * rs_collect_tx_data - Update the success/failure sliding window
658 *
659 * We keep a sliding window of the last 62 packets transmitted
660 * at this rate. window->data contains the bitmask of successful
661 * packets.
662 */
663 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
664 struct iwl_scale_tbl_info *tbl,
665 int scale_index, int attempts, int successes,
666 struct iwl_rate_scale_data *window)
667 {
668 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
669 s32 fail_count, tpt;
670
671 /* Get expected throughput */
672 tpt = get_expected_tpt(tbl, scale_index);
673
674 /*
675 * Keep track of only the latest 62 tx frame attempts in this rate's
676 * history window; anything older isn't really relevant any more.
677 * If we have filled up the sliding window, drop the oldest attempt;
678 * if the oldest attempt (highest bit in bitmap) shows "success",
679 * subtract "1" from the success counter (this is the main reason
680 * we keep these bitmaps!).
681 */
682 while (attempts > 0) {
683 if (window->counter >= IWL_RATE_MAX_WINDOW) {
684 /* remove earliest */
685 window->counter = IWL_RATE_MAX_WINDOW - 1;
686
687 if (window->data & mask) {
688 window->data &= ~mask;
689 window->success_counter--;
690 }
691 }
692
693 /* Increment frames-attempted counter */
694 window->counter++;
695
696 /* Shift bitmap by one frame to throw away oldest history */
697 window->data <<= 1;
698
699 /* Mark the most recent #successes attempts as successful */
700 if (successes > 0) {
701 window->success_counter++;
702 window->data |= 0x1;
703 successes--;
704 }
705
706 attempts--;
707 }
708
709 /* Calculate current success ratio, avoid divide-by-0! */
710 if (window->counter > 0)
711 window->success_ratio = 128 * (100 * window->success_counter)
712 / window->counter;
713 else
714 window->success_ratio = IWL_INVALID_VALUE;
715
716 fail_count = window->counter - window->success_counter;
717
718 /* Calculate average throughput, if we have enough history. */
719 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
720 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
721 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
722 else
723 window->average_tpt = IWL_INVALID_VALUE;
724
725 return 0;
726 }
727
728 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
729 struct iwl_lq_sta *lq_sta,
730 struct iwl_scale_tbl_info *tbl,
731 int scale_index, int attempts, int successes,
732 u8 reduced_txp)
733 {
734 struct iwl_rate_scale_data *window = NULL;
735
736 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
737 return -EINVAL;
738
739 window = &tbl->tpc_win[reduced_txp];
740 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
741 window);
742 }
743
744 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
745 struct iwl_lq_sta *lq_sta,
746 struct iwl_scale_tbl_info *tbl,
747 int scale_index, int attempts, int successes)
748 {
749 struct iwl_rate_scale_data *window = NULL;
750
751 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
752 return -EINVAL;
753
754 if (tbl->column != RS_COLUMN_INVALID) {
755 struct lq_sta_pers *pers = &lq_sta->pers;
756
757 pers->tx_stats[tbl->column][scale_index].total += attempts;
758 pers->tx_stats[tbl->column][scale_index].success += successes;
759 }
760
761 /* Select window for current tx bit rate */
762 window = &(tbl->win[scale_index]);
763 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
764 window);
765 }
766
767 /* Convert rs_rate object into ucode rate bitmask */
768 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
769 struct rs_rate *rate)
770 {
771 u32 ucode_rate = 0;
772 int index = rate->index;
773
774 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
775 RATE_MCS_ANT_ABC_MSK);
776
777 if (is_legacy(rate)) {
778 ucode_rate |= iwl_rates[index].plcp;
779 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
780 ucode_rate |= RATE_MCS_CCK_MSK;
781 return ucode_rate;
782 }
783
784 if (is_ht(rate)) {
785 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
786 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
787 index = IWL_LAST_HT_RATE;
788 }
789 ucode_rate |= RATE_MCS_HT_MSK;
790
791 if (is_ht_siso(rate))
792 ucode_rate |= iwl_rates[index].plcp_ht_siso;
793 else if (is_ht_mimo2(rate))
794 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
795 else
796 WARN_ON_ONCE(1);
797 } else if (is_vht(rate)) {
798 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
799 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
800 index = IWL_LAST_VHT_RATE;
801 }
802 ucode_rate |= RATE_MCS_VHT_MSK;
803 if (is_vht_siso(rate))
804 ucode_rate |= iwl_rates[index].plcp_vht_siso;
805 else if (is_vht_mimo2(rate))
806 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
807 else
808 WARN_ON_ONCE(1);
809
810 } else {
811 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
812 }
813
814 if (is_siso(rate) && rate->stbc) {
815 /* To enable STBC we need to set both a flag and ANT_AB */
816 ucode_rate |= RATE_MCS_ANT_AB_MSK;
817 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
818 }
819
820 ucode_rate |= rate->bw;
821 if (rate->sgi)
822 ucode_rate |= RATE_MCS_SGI_MSK;
823 if (rate->ldpc)
824 ucode_rate |= RATE_MCS_LDPC_MSK;
825
826 return ucode_rate;
827 }
828
829 /* Convert a ucode rate into an rs_rate object */
830 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
831 enum ieee80211_band band,
832 struct rs_rate *rate)
833 {
834 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
835 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
836 u8 nss;
837
838 memset(rate, 0, sizeof(*rate));
839 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
840
841 if (rate->index == IWL_RATE_INVALID)
842 return -EINVAL;
843
844 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
845
846 /* Legacy */
847 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
848 !(ucode_rate & RATE_MCS_VHT_MSK)) {
849 if (num_of_ant == 1) {
850 if (band == IEEE80211_BAND_5GHZ)
851 rate->type = LQ_LEGACY_A;
852 else
853 rate->type = LQ_LEGACY_G;
854 }
855
856 return 0;
857 }
858
859 /* HT or VHT */
860 if (ucode_rate & RATE_MCS_SGI_MSK)
861 rate->sgi = true;
862 if (ucode_rate & RATE_MCS_LDPC_MSK)
863 rate->ldpc = true;
864 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
865 rate->stbc = true;
866 if (ucode_rate & RATE_MCS_BF_MSK)
867 rate->bfer = true;
868
869 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
870
871 if (ucode_rate & RATE_MCS_HT_MSK) {
872 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
873 RATE_HT_MCS_NSS_POS) + 1;
874
875 if (nss == 1) {
876 rate->type = LQ_HT_SISO;
877 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
878 "stbc %d bfer %d",
879 rate->stbc, rate->bfer);
880 } else if (nss == 2) {
881 rate->type = LQ_HT_MIMO2;
882 WARN_ON_ONCE(num_of_ant != 2);
883 } else {
884 WARN_ON_ONCE(1);
885 }
886 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
887 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
888 RATE_VHT_MCS_NSS_POS) + 1;
889
890 if (nss == 1) {
891 rate->type = LQ_VHT_SISO;
892 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
893 "stbc %d bfer %d",
894 rate->stbc, rate->bfer);
895 } else if (nss == 2) {
896 rate->type = LQ_VHT_MIMO2;
897 WARN_ON_ONCE(num_of_ant != 2);
898 } else {
899 WARN_ON_ONCE(1);
900 }
901 }
902
903 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
904 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
905 !is_vht(rate));
906
907 return 0;
908 }
909
910 /* switch to another antenna/antennas and return 1 */
911 /* if no other valid antenna found, return 0 */
912 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
913 {
914 u8 new_ant_type;
915
916 if (!rate->ant || rate->ant > ANT_ABC)
917 return 0;
918
919 if (!rs_is_valid_ant(valid_ant, rate->ant))
920 return 0;
921
922 new_ant_type = ant_toggle_lookup[rate->ant];
923
924 while ((new_ant_type != rate->ant) &&
925 !rs_is_valid_ant(valid_ant, new_ant_type))
926 new_ant_type = ant_toggle_lookup[new_ant_type];
927
928 if (new_ant_type == rate->ant)
929 return 0;
930
931 rate->ant = new_ant_type;
932
933 return 1;
934 }
935
936 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
937 struct rs_rate *rate)
938 {
939 if (is_legacy(rate))
940 return lq_sta->active_legacy_rate;
941 else if (is_siso(rate))
942 return lq_sta->active_siso_rate;
943 else if (is_mimo2(rate))
944 return lq_sta->active_mimo2_rate;
945
946 WARN_ON_ONCE(1);
947 return 0;
948 }
949
950 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
951 int rate_type)
952 {
953 u8 high = IWL_RATE_INVALID;
954 u8 low = IWL_RATE_INVALID;
955
956 /* 802.11A or ht walks to the next literal adjacent rate in
957 * the rate table */
958 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
959 int i;
960 u32 mask;
961
962 /* Find the previous rate that is in the rate mask */
963 i = index - 1;
964 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
965 if (rate_mask & mask) {
966 low = i;
967 break;
968 }
969 }
970
971 /* Find the next rate that is in the rate mask */
972 i = index + 1;
973 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
974 if (rate_mask & mask) {
975 high = i;
976 break;
977 }
978 }
979
980 return (high << 8) | low;
981 }
982
983 low = index;
984 while (low != IWL_RATE_INVALID) {
985 low = iwl_rates[low].prev_rs;
986 if (low == IWL_RATE_INVALID)
987 break;
988 if (rate_mask & (1 << low))
989 break;
990 }
991
992 high = index;
993 while (high != IWL_RATE_INVALID) {
994 high = iwl_rates[high].next_rs;
995 if (high == IWL_RATE_INVALID)
996 break;
997 if (rate_mask & (1 << high))
998 break;
999 }
1000
1001 return (high << 8) | low;
1002 }
1003
1004 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1005 struct rs_rate *rate)
1006 {
1007 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1008 }
1009
1010 /* Get the next supported lower rate in the current column.
1011 * Return true if bottom rate in the current column was reached
1012 */
1013 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1014 struct rs_rate *rate)
1015 {
1016 u8 low;
1017 u16 high_low;
1018 u16 rate_mask;
1019 struct iwl_mvm *mvm = lq_sta->pers.drv;
1020
1021 rate_mask = rs_get_supported_rates(lq_sta, rate);
1022 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1023 rate->type);
1024 low = high_low & 0xff;
1025
1026 /* Bottom rate of column reached */
1027 if (low == IWL_RATE_INVALID)
1028 return true;
1029
1030 rate->index = low;
1031 return false;
1032 }
1033
1034 /* Get the next rate to use following a column downgrade */
1035 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1036 struct rs_rate *rate)
1037 {
1038 struct iwl_mvm *mvm = lq_sta->pers.drv;
1039
1040 if (is_legacy(rate)) {
1041 /* No column to downgrade from Legacy */
1042 return;
1043 } else if (is_siso(rate)) {
1044 /* Downgrade to Legacy if we were in SISO */
1045 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1046 rate->type = LQ_LEGACY_A;
1047 else
1048 rate->type = LQ_LEGACY_G;
1049
1050 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1051
1052 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1053 rate->index > IWL_RATE_MCS_9_INDEX);
1054
1055 rate->index = rs_ht_to_legacy[rate->index];
1056 rate->ldpc = false;
1057 } else {
1058 /* Downgrade to SISO with same MCS if in MIMO */
1059 rate->type = is_vht_mimo2(rate) ?
1060 LQ_VHT_SISO : LQ_HT_SISO;
1061 }
1062
1063 if (num_of_ant(rate->ant) > 1)
1064 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1065
1066 /* Relevant in both switching to SISO or Legacy */
1067 rate->sgi = false;
1068
1069 if (!rs_rate_supported(lq_sta, rate))
1070 rs_get_lower_rate_in_column(lq_sta, rate);
1071 }
1072
1073 /* Check if both rates are identical
1074 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1075 * with a rate indicating STBC/BFER and ANT_AB.
1076 */
1077 static inline bool rs_rate_equal(struct rs_rate *a,
1078 struct rs_rate *b,
1079 bool allow_ant_mismatch)
1080
1081 {
1082 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1083 (a->bfer == b->bfer);
1084
1085 if (allow_ant_mismatch) {
1086 if (a->stbc || a->bfer) {
1087 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1088 a->stbc, a->bfer, a->ant);
1089 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1090 } else if (b->stbc || b->bfer) {
1091 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1092 b->stbc, b->bfer, b->ant);
1093 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1094 }
1095 }
1096
1097 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1098 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1099 }
1100
1101 /* Check if both rates share the same column */
1102 static inline bool rs_rate_column_match(struct rs_rate *a,
1103 struct rs_rate *b)
1104 {
1105 bool ant_match;
1106
1107 if (a->stbc || a->bfer)
1108 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1109 else
1110 ant_match = (a->ant == b->ant);
1111
1112 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1113 && ant_match;
1114 }
1115
1116 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1117 {
1118 if (is_legacy(rate)) {
1119 if (rate->ant == ANT_A)
1120 return RS_COLUMN_LEGACY_ANT_A;
1121
1122 if (rate->ant == ANT_B)
1123 return RS_COLUMN_LEGACY_ANT_B;
1124
1125 goto err;
1126 }
1127
1128 if (is_siso(rate)) {
1129 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1130 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1131 RS_COLUMN_SISO_ANT_A;
1132
1133 if (rate->ant == ANT_B)
1134 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1135 RS_COLUMN_SISO_ANT_B;
1136
1137 goto err;
1138 }
1139
1140 if (is_mimo(rate))
1141 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1142
1143 err:
1144 return RS_COLUMN_INVALID;
1145 }
1146
1147 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1148 {
1149 u8 tid = IWL_MAX_TID_COUNT;
1150
1151 if (ieee80211_is_data_qos(hdr->frame_control)) {
1152 u8 *qc = ieee80211_get_qos_ctl(hdr);
1153 tid = qc[0] & 0xf;
1154 }
1155
1156 if (unlikely(tid > IWL_MAX_TID_COUNT))
1157 tid = IWL_MAX_TID_COUNT;
1158
1159 return tid;
1160 }
1161
1162 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1163 int tid, struct ieee80211_tx_info *info)
1164 {
1165 int legacy_success;
1166 int retries;
1167 int i;
1168 struct iwl_lq_cmd *table;
1169 u32 lq_hwrate;
1170 struct rs_rate lq_rate, tx_resp_rate;
1171 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1172 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1173 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1174 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1175 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1176 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1177 IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1178
1179 /* Treat uninitialized rate scaling data same as non-existing. */
1180 if (!lq_sta) {
1181 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1182 return;
1183 } else if (!lq_sta->pers.drv) {
1184 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1185 return;
1186 }
1187
1188 /* This packet was aggregated but doesn't carry status info */
1189 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1190 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1191 return;
1192
1193 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1194
1195 #ifdef CONFIG_MAC80211_DEBUGFS
1196 /* Disable last tx check if we are debugging with fixed rate but
1197 * update tx stats */
1198 if (lq_sta->pers.dbg_fixed_rate) {
1199 int index = tx_resp_rate.index;
1200 enum rs_column column;
1201 int attempts, success;
1202
1203 column = rs_get_column_from_rate(&tx_resp_rate);
1204 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1205 "Can't map rate 0x%x to column",
1206 tx_resp_hwrate))
1207 return;
1208
1209 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1210 attempts = info->status.ampdu_len;
1211 success = info->status.ampdu_ack_len;
1212 } else {
1213 attempts = info->status.rates[0].count;
1214 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1215 }
1216
1217 lq_sta->pers.tx_stats[column][index].total += attempts;
1218 lq_sta->pers.tx_stats[column][index].success += success;
1219
1220 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1221 tx_resp_hwrate, success, attempts);
1222 return;
1223 }
1224 #endif
1225
1226 if (time_after(jiffies,
1227 (unsigned long)(lq_sta->last_tx +
1228 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1229 int t;
1230
1231 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1232 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1233 ieee80211_stop_tx_ba_session(sta, t);
1234
1235 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1236 return;
1237 }
1238 lq_sta->last_tx = jiffies;
1239
1240 /* Ignore this Tx frame response if its initial rate doesn't match
1241 * that of latest Link Quality command. There may be stragglers
1242 * from a previous Link Quality command, but we're no longer interested
1243 * in those; they're either from the "active" mode while we're trying
1244 * to check "search" mode, or a prior "search" mode after we've moved
1245 * to a new "search" mode (which might become the new "active" mode).
1246 */
1247 table = &lq_sta->lq;
1248 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1249 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1250
1251 /* Here we actually compare this rate to the latest LQ command */
1252 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1253 IWL_DEBUG_RATE(mvm,
1254 "initial tx resp rate 0x%x does not match 0x%x\n",
1255 tx_resp_hwrate, lq_hwrate);
1256
1257 /*
1258 * Since rates mis-match, the last LQ command may have failed.
1259 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1260 * ... driver.
1261 */
1262 lq_sta->missed_rate_counter++;
1263 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1264 lq_sta->missed_rate_counter = 0;
1265 IWL_DEBUG_RATE(mvm,
1266 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1267 lq_sta->rs_state);
1268 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1269 }
1270 /* Regardless, ignore this status info for outdated rate */
1271 return;
1272 } else
1273 /* Rate did match, so reset the missed_rate_counter */
1274 lq_sta->missed_rate_counter = 0;
1275
1276 if (!lq_sta->search_better_tbl) {
1277 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1278 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1279 } else {
1280 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1281 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1282 }
1283
1284 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1285 IWL_DEBUG_RATE(mvm,
1286 "Neither active nor search matches tx rate\n");
1287 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1288 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1289 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1290 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1291 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1292
1293 /*
1294 * no matching table found, let's by-pass the data collection
1295 * and continue to perform rate scale to find the rate table
1296 */
1297 rs_stay_in_table(lq_sta, true);
1298 goto done;
1299 }
1300
1301 /*
1302 * Updating the frame history depends on whether packets were
1303 * aggregated.
1304 *
1305 * For aggregation, all packets were transmitted at the same rate, the
1306 * first index into rate scale table.
1307 */
1308 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1309 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1310 info->status.ampdu_len,
1311 info->status.ampdu_ack_len,
1312 reduced_txp);
1313
1314 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1315 * it as a single frame loss as we don't want the success ratio
1316 * to dip too quickly because a BA wasn't received.
1317 * For TPC, there's no need for this optimisation since we want
1318 * to recover very quickly from a bad power reduction and,
1319 * therefore we'd like the success ratio to get an immediate hit
1320 * when failing to get a BA, so we'd switch back to a lower or
1321 * zero power reduction. When FW transmits agg with a rate
1322 * different from the initial rate, it will not use reduced txp
1323 * and will send BA notification twice (one empty with reduced
1324 * txp equal to the value from LQ and one with reduced txp 0).
1325 * We need to update counters for each txp level accordingly.
1326 */
1327 if (info->status.ampdu_ack_len == 0)
1328 info->status.ampdu_len = 1;
1329
1330 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1331 info->status.ampdu_len,
1332 info->status.ampdu_ack_len);
1333
1334 /* Update success/fail counts if not searching for new mode */
1335 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1336 lq_sta->total_success += info->status.ampdu_ack_len;
1337 lq_sta->total_failed += (info->status.ampdu_len -
1338 info->status.ampdu_ack_len);
1339 }
1340 } else {
1341 /* For legacy, update frame history with for each Tx retry. */
1342 retries = info->status.rates[0].count - 1;
1343 /* HW doesn't send more than 15 retries */
1344 retries = min(retries, 15);
1345
1346 /* The last transmission may have been successful */
1347 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1348 /* Collect data for each rate used during failed TX attempts */
1349 for (i = 0; i <= retries; ++i) {
1350 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1351 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1352 &lq_rate);
1353 /*
1354 * Only collect stats if retried rate is in the same RS
1355 * table as active/search.
1356 */
1357 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1358 tmp_tbl = curr_tbl;
1359 else if (rs_rate_column_match(&lq_rate,
1360 &other_tbl->rate))
1361 tmp_tbl = other_tbl;
1362 else
1363 continue;
1364
1365 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1366 lq_rate.index, 1,
1367 i < retries ? 0 : legacy_success,
1368 reduced_txp);
1369 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1370 lq_rate.index, 1,
1371 i < retries ? 0 : legacy_success);
1372 }
1373
1374 /* Update success/fail counts if not searching for new mode */
1375 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1376 lq_sta->total_success += legacy_success;
1377 lq_sta->total_failed += retries + (1 - legacy_success);
1378 }
1379 }
1380 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1381 lq_sta->last_rate_n_flags = lq_hwrate;
1382 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1383 done:
1384 /* See if there's a better rate or modulation mode to try. */
1385 if (sta->supp_rates[info->band])
1386 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1387 }
1388
1389 /*
1390 * mac80211 sends us Tx status
1391 */
1392 static void rs_mac80211_tx_status(void *mvm_r,
1393 struct ieee80211_supported_band *sband,
1394 struct ieee80211_sta *sta, void *priv_sta,
1395 struct sk_buff *skb)
1396 {
1397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1398 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1399 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1400 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1401
1402 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1403 return;
1404
1405 if (!ieee80211_is_data(hdr->frame_control) ||
1406 info->flags & IEEE80211_TX_CTL_NO_ACK)
1407 return;
1408
1409 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1410 }
1411
1412 /*
1413 * Begin a period of staying with a selected modulation mode.
1414 * Set "stay_in_tbl" flag to prevent any mode switches.
1415 * Set frame tx success limits according to legacy vs. high-throughput,
1416 * and reset overall (spanning all rates) tx success history statistics.
1417 * These control how long we stay using same modulation mode before
1418 * searching for a new mode.
1419 */
1420 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1421 struct iwl_lq_sta *lq_sta)
1422 {
1423 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1424 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1425 if (is_legacy) {
1426 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1427 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1428 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1429 } else {
1430 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1431 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1432 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1433 }
1434 lq_sta->table_count = 0;
1435 lq_sta->total_failed = 0;
1436 lq_sta->total_success = 0;
1437 lq_sta->flush_timer = jiffies;
1438 lq_sta->visited_columns = 0;
1439 }
1440
1441 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1442 {
1443 if (rate_mask)
1444 return find_last_bit(&rate_mask, BITS_PER_LONG);
1445 return IWL_RATE_INVALID;
1446 }
1447
1448 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1449 const struct rs_tx_column *column)
1450 {
1451 switch (column->mode) {
1452 case RS_LEGACY:
1453 return lq_sta->max_legacy_rate_idx;
1454 case RS_SISO:
1455 return lq_sta->max_siso_rate_idx;
1456 case RS_MIMO2:
1457 return lq_sta->max_mimo2_rate_idx;
1458 default:
1459 WARN_ON_ONCE(1);
1460 }
1461
1462 return lq_sta->max_legacy_rate_idx;
1463 }
1464
1465 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1466 const struct rs_tx_column *column,
1467 u32 bw)
1468 {
1469 /* Used to choose among HT tables */
1470 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1471
1472 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1473 column->mode != RS_SISO &&
1474 column->mode != RS_MIMO2))
1475 return expected_tpt_legacy;
1476
1477 /* Legacy rates have only one table */
1478 if (column->mode == RS_LEGACY)
1479 return expected_tpt_legacy;
1480
1481 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1482 /* Choose among many HT tables depending on number of streams
1483 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1484 * status */
1485 if (column->mode == RS_SISO) {
1486 switch (bw) {
1487 case RATE_MCS_CHAN_WIDTH_20:
1488 ht_tbl_pointer = expected_tpt_siso_20MHz;
1489 break;
1490 case RATE_MCS_CHAN_WIDTH_40:
1491 ht_tbl_pointer = expected_tpt_siso_40MHz;
1492 break;
1493 case RATE_MCS_CHAN_WIDTH_80:
1494 ht_tbl_pointer = expected_tpt_siso_80MHz;
1495 break;
1496 default:
1497 WARN_ON_ONCE(1);
1498 }
1499 } else if (column->mode == RS_MIMO2) {
1500 switch (bw) {
1501 case RATE_MCS_CHAN_WIDTH_20:
1502 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1503 break;
1504 case RATE_MCS_CHAN_WIDTH_40:
1505 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1506 break;
1507 case RATE_MCS_CHAN_WIDTH_80:
1508 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1509 break;
1510 default:
1511 WARN_ON_ONCE(1);
1512 }
1513 } else {
1514 WARN_ON_ONCE(1);
1515 }
1516
1517 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1518 return ht_tbl_pointer[0];
1519 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1520 return ht_tbl_pointer[1];
1521 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1522 return ht_tbl_pointer[2];
1523 else /* AGG+SGI */
1524 return ht_tbl_pointer[3];
1525 }
1526
1527 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1528 struct iwl_scale_tbl_info *tbl)
1529 {
1530 struct rs_rate *rate = &tbl->rate;
1531 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1532
1533 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1534 }
1535
1536 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1537 struct iwl_lq_sta *lq_sta,
1538 struct iwl_scale_tbl_info *tbl, /* "search" */
1539 unsigned long rate_mask, s8 index)
1540 {
1541 struct iwl_scale_tbl_info *active_tbl =
1542 &(lq_sta->lq_info[lq_sta->active_tbl]);
1543 s32 success_ratio = active_tbl->win[index].success_ratio;
1544 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1545 const u16 *tpt_tbl = tbl->expected_tpt;
1546 u16 high_low;
1547 u32 target_tpt;
1548 int rate_idx;
1549
1550 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1551 target_tpt = 100 * expected_current_tpt;
1552 IWL_DEBUG_RATE(mvm,
1553 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1554 success_ratio, target_tpt);
1555 } else {
1556 target_tpt = lq_sta->last_tpt;
1557 IWL_DEBUG_RATE(mvm,
1558 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1559 success_ratio, target_tpt);
1560 }
1561
1562 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1563
1564 while (rate_idx != IWL_RATE_INVALID) {
1565 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1566 break;
1567
1568 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1569 tbl->rate.type);
1570
1571 rate_idx = (high_low >> 8) & 0xff;
1572 }
1573
1574 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1575 rate_idx, target_tpt,
1576 rate_idx != IWL_RATE_INVALID ?
1577 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1578
1579 return rate_idx;
1580 }
1581
1582 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1583 {
1584 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1585 return RATE_MCS_CHAN_WIDTH_80;
1586 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1587 return RATE_MCS_CHAN_WIDTH_40;
1588
1589 return RATE_MCS_CHAN_WIDTH_20;
1590 }
1591
1592 /*
1593 * Check whether we should continue using same modulation mode, or
1594 * begin search for a new mode, based on:
1595 * 1) # tx successes or failures while using this mode
1596 * 2) # times calling this function
1597 * 3) elapsed time in this mode (not used, for now)
1598 */
1599 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1600 {
1601 struct iwl_scale_tbl_info *tbl;
1602 int active_tbl;
1603 int flush_interval_passed = 0;
1604 struct iwl_mvm *mvm;
1605
1606 mvm = lq_sta->pers.drv;
1607 active_tbl = lq_sta->active_tbl;
1608
1609 tbl = &(lq_sta->lq_info[active_tbl]);
1610
1611 /* If we've been disallowing search, see if we should now allow it */
1612 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1613 /* Elapsed time using current modulation mode */
1614 if (lq_sta->flush_timer)
1615 flush_interval_passed =
1616 time_after(jiffies,
1617 (unsigned long)(lq_sta->flush_timer +
1618 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1619
1620 /*
1621 * Check if we should allow search for new modulation mode.
1622 * If many frames have failed or succeeded, or we've used
1623 * this same modulation for a long time, allow search, and
1624 * reset history stats that keep track of whether we should
1625 * allow a new search. Also (below) reset all bitmaps and
1626 * stats in active history.
1627 */
1628 if (force_search ||
1629 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1630 (lq_sta->total_success > lq_sta->max_success_limit) ||
1631 ((!lq_sta->search_better_tbl) &&
1632 (lq_sta->flush_timer) && (flush_interval_passed))) {
1633 IWL_DEBUG_RATE(mvm,
1634 "LQ: stay is expired %d %d %d\n",
1635 lq_sta->total_failed,
1636 lq_sta->total_success,
1637 flush_interval_passed);
1638
1639 /* Allow search for new mode */
1640 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1641 IWL_DEBUG_RATE(mvm,
1642 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1643 lq_sta->total_failed = 0;
1644 lq_sta->total_success = 0;
1645 lq_sta->flush_timer = 0;
1646 /* mark the current column as visited */
1647 lq_sta->visited_columns = BIT(tbl->column);
1648 /*
1649 * Else if we've used this modulation mode enough repetitions
1650 * (regardless of elapsed time or success/failure), reset
1651 * history bitmaps and rate-specific stats for all rates in
1652 * active table.
1653 */
1654 } else {
1655 lq_sta->table_count++;
1656 if (lq_sta->table_count >=
1657 lq_sta->table_count_limit) {
1658 lq_sta->table_count = 0;
1659
1660 IWL_DEBUG_RATE(mvm,
1661 "LQ: stay in table clear win\n");
1662 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1663 }
1664 }
1665
1666 /* If transitioning to allow "search", reset all history
1667 * bitmaps and stats in active table (this will become the new
1668 * "search" table). */
1669 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1670 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1671 }
1672 }
1673 }
1674
1675 /*
1676 * setup rate table in uCode
1677 */
1678 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1679 struct ieee80211_sta *sta,
1680 struct iwl_lq_sta *lq_sta,
1681 struct iwl_scale_tbl_info *tbl)
1682 {
1683 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1684 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1685 }
1686
1687 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1688 struct ieee80211_sta *sta,
1689 struct iwl_lq_sta *lq_sta,
1690 struct iwl_scale_tbl_info *tbl,
1691 enum rs_action scale_action)
1692 {
1693 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1694 return false;
1695
1696 if (!is_vht_siso(&tbl->rate))
1697 return false;
1698
1699 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1700 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1701 (scale_action == RS_ACTION_DOWNSCALE)) {
1702 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1703 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1704 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1705 goto tweaked;
1706 }
1707
1708 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1709 * sustainable, i.e. we're past the test window. We can't go back
1710 * if MCS5 is just tested as this will happen always after switching
1711 * to 20Mhz MCS4 because the rate stats are cleared.
1712 */
1713 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1714 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1715 (scale_action == RS_ACTION_STAY)) ||
1716 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1717 (scale_action == RS_ACTION_UPSCALE)))) {
1718 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1719 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1720 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1721 goto tweaked;
1722 }
1723
1724 return false;
1725
1726 tweaked:
1727 rs_set_expected_tpt_table(lq_sta, tbl);
1728 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1729 return true;
1730 }
1731
1732 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1733 struct iwl_lq_sta *lq_sta,
1734 struct ieee80211_sta *sta,
1735 struct iwl_scale_tbl_info *tbl)
1736 {
1737 int i, j, max_rate;
1738 enum rs_column next_col_id;
1739 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1740 const struct rs_tx_column *next_col;
1741 allow_column_func_t allow_func;
1742 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1743 const u16 *expected_tpt_tbl;
1744 u16 tpt, max_expected_tpt;
1745
1746 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1747 next_col_id = curr_col->next_columns[i];
1748
1749 if (next_col_id == RS_COLUMN_INVALID)
1750 continue;
1751
1752 if (lq_sta->visited_columns & BIT(next_col_id)) {
1753 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1754 next_col_id);
1755 continue;
1756 }
1757
1758 next_col = &rs_tx_columns[next_col_id];
1759
1760 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1761 IWL_DEBUG_RATE(mvm,
1762 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1763 next_col_id, valid_ants, next_col->ant);
1764 continue;
1765 }
1766
1767 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1768 allow_func = next_col->checks[j];
1769 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1770 next_col))
1771 break;
1772 }
1773
1774 if (j != MAX_COLUMN_CHECKS) {
1775 IWL_DEBUG_RATE(mvm,
1776 "Skip column %d: not allowed (check %d failed)\n",
1777 next_col_id, j);
1778
1779 continue;
1780 }
1781
1782 tpt = lq_sta->last_tpt / 100;
1783 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1784 rs_bw_from_sta_bw(sta));
1785 if (WARN_ON_ONCE(!expected_tpt_tbl))
1786 continue;
1787
1788 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1789 if (max_rate == IWL_RATE_INVALID) {
1790 IWL_DEBUG_RATE(mvm,
1791 "Skip column %d: no rate is allowed in this column\n",
1792 next_col_id);
1793 continue;
1794 }
1795
1796 max_expected_tpt = expected_tpt_tbl[max_rate];
1797 if (tpt >= max_expected_tpt) {
1798 IWL_DEBUG_RATE(mvm,
1799 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1800 next_col_id, max_expected_tpt, tpt);
1801 continue;
1802 }
1803
1804 IWL_DEBUG_RATE(mvm,
1805 "Found potential column %d. Max expected %d current %d\n",
1806 next_col_id, max_expected_tpt, tpt);
1807 break;
1808 }
1809
1810 if (i == MAX_NEXT_COLUMNS)
1811 return RS_COLUMN_INVALID;
1812
1813 return next_col_id;
1814 }
1815
1816 static int rs_switch_to_column(struct iwl_mvm *mvm,
1817 struct iwl_lq_sta *lq_sta,
1818 struct ieee80211_sta *sta,
1819 enum rs_column col_id)
1820 {
1821 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1822 struct iwl_scale_tbl_info *search_tbl =
1823 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1824 struct rs_rate *rate = &search_tbl->rate;
1825 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1826 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1827 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1828 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1829 unsigned long rate_mask = 0;
1830 u32 rate_idx = 0;
1831
1832 memcpy(search_tbl, tbl, sz);
1833
1834 rate->sgi = column->sgi;
1835 rate->ant = column->ant;
1836
1837 if (column->mode == RS_LEGACY) {
1838 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1839 rate->type = LQ_LEGACY_A;
1840 else
1841 rate->type = LQ_LEGACY_G;
1842
1843 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1844 rate->ldpc = false;
1845 rate_mask = lq_sta->active_legacy_rate;
1846 } else if (column->mode == RS_SISO) {
1847 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1848 rate_mask = lq_sta->active_siso_rate;
1849 } else if (column->mode == RS_MIMO2) {
1850 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1851 rate_mask = lq_sta->active_mimo2_rate;
1852 } else {
1853 WARN_ONCE(1, "Bad column mode");
1854 }
1855
1856 if (column->mode != RS_LEGACY) {
1857 rate->bw = rs_bw_from_sta_bw(sta);
1858 rate->ldpc = lq_sta->ldpc;
1859 }
1860
1861 search_tbl->column = col_id;
1862 rs_set_expected_tpt_table(lq_sta, search_tbl);
1863
1864 lq_sta->visited_columns |= BIT(col_id);
1865
1866 /* Get the best matching rate if we're changing modes. e.g.
1867 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1868 */
1869 if (curr_column->mode != column->mode) {
1870 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1871 rate_mask, rate->index);
1872
1873 if ((rate_idx == IWL_RATE_INVALID) ||
1874 !(BIT(rate_idx) & rate_mask)) {
1875 IWL_DEBUG_RATE(mvm,
1876 "can not switch with index %d"
1877 " rate mask %lx\n",
1878 rate_idx, rate_mask);
1879
1880 goto err;
1881 }
1882
1883 rate->index = rate_idx;
1884 }
1885
1886 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1887 col_id, rate->index);
1888
1889 return 0;
1890
1891 err:
1892 rate->type = LQ_NONE;
1893 return -1;
1894 }
1895
1896 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1897 struct iwl_scale_tbl_info *tbl,
1898 s32 sr, int low, int high,
1899 int current_tpt,
1900 int low_tpt, int high_tpt)
1901 {
1902 enum rs_action action = RS_ACTION_STAY;
1903
1904 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1905 (current_tpt == 0)) {
1906 IWL_DEBUG_RATE(mvm,
1907 "Decrease rate because of low SR\n");
1908 return RS_ACTION_DOWNSCALE;
1909 }
1910
1911 if ((low_tpt == IWL_INVALID_VALUE) &&
1912 (high_tpt == IWL_INVALID_VALUE) &&
1913 (high != IWL_RATE_INVALID)) {
1914 IWL_DEBUG_RATE(mvm,
1915 "No data about high/low rates. Increase rate\n");
1916 return RS_ACTION_UPSCALE;
1917 }
1918
1919 if ((high_tpt == IWL_INVALID_VALUE) &&
1920 (high != IWL_RATE_INVALID) &&
1921 (low_tpt != IWL_INVALID_VALUE) &&
1922 (low_tpt < current_tpt)) {
1923 IWL_DEBUG_RATE(mvm,
1924 "No data about high rate and low rate is worse. Increase rate\n");
1925 return RS_ACTION_UPSCALE;
1926 }
1927
1928 if ((high_tpt != IWL_INVALID_VALUE) &&
1929 (high_tpt > current_tpt)) {
1930 IWL_DEBUG_RATE(mvm,
1931 "Higher rate is better. Increate rate\n");
1932 return RS_ACTION_UPSCALE;
1933 }
1934
1935 if ((low_tpt != IWL_INVALID_VALUE) &&
1936 (high_tpt != IWL_INVALID_VALUE) &&
1937 (low_tpt < current_tpt) &&
1938 (high_tpt < current_tpt)) {
1939 IWL_DEBUG_RATE(mvm,
1940 "Both high and low are worse. Maintain rate\n");
1941 return RS_ACTION_STAY;
1942 }
1943
1944 if ((low_tpt != IWL_INVALID_VALUE) &&
1945 (low_tpt > current_tpt)) {
1946 IWL_DEBUG_RATE(mvm,
1947 "Lower rate is better\n");
1948 action = RS_ACTION_DOWNSCALE;
1949 goto out;
1950 }
1951
1952 if ((low_tpt == IWL_INVALID_VALUE) &&
1953 (low != IWL_RATE_INVALID)) {
1954 IWL_DEBUG_RATE(mvm,
1955 "No data about lower rate\n");
1956 action = RS_ACTION_DOWNSCALE;
1957 goto out;
1958 }
1959
1960 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1961
1962 out:
1963 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1964 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1965 IWL_DEBUG_RATE(mvm,
1966 "SR is above NO DECREASE. Avoid downscale\n");
1967 action = RS_ACTION_STAY;
1968 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1969 IWL_DEBUG_RATE(mvm,
1970 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1971 action = RS_ACTION_STAY;
1972 } else {
1973 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1974 }
1975 }
1976
1977 return action;
1978 }
1979
1980 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1981 struct iwl_lq_sta *lq_sta)
1982 {
1983 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1984 * supports STBC of at least 1*SS
1985 */
1986 if (!lq_sta->stbc_capable)
1987 return false;
1988
1989 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1990 return false;
1991
1992 return true;
1993 }
1994
1995 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1996 int *weaker, int *stronger)
1997 {
1998 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1999 if (*weaker > TPC_MAX_REDUCTION)
2000 *weaker = TPC_INVALID;
2001
2002 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2003 if (*stronger < 0)
2004 *stronger = TPC_INVALID;
2005 }
2006
2007 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2008 struct rs_rate *rate, enum ieee80211_band band)
2009 {
2010 int index = rate->index;
2011 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2012 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2013 !vif->bss_conf.ps);
2014
2015 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2016 cam, sta_ps_disabled);
2017 /*
2018 * allow tpc only if power management is enabled, or bt coex
2019 * activity grade allows it and we are on 2.4Ghz.
2020 */
2021 if ((cam || sta_ps_disabled) &&
2022 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2023 return false;
2024
2025 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2026 if (is_legacy(rate))
2027 return index == IWL_RATE_54M_INDEX;
2028 if (is_ht(rate))
2029 return index == IWL_RATE_MCS_7_INDEX;
2030 if (is_vht(rate))
2031 return index == IWL_RATE_MCS_7_INDEX ||
2032 index == IWL_RATE_MCS_8_INDEX ||
2033 index == IWL_RATE_MCS_9_INDEX;
2034
2035 WARN_ON_ONCE(1);
2036 return false;
2037 }
2038
2039 enum tpc_action {
2040 TPC_ACTION_STAY,
2041 TPC_ACTION_DECREASE,
2042 TPC_ACTION_INCREASE,
2043 TPC_ACTION_NO_RESTIRCTION,
2044 };
2045
2046 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2047 s32 sr, int weak, int strong,
2048 int current_tpt,
2049 int weak_tpt, int strong_tpt)
2050 {
2051 /* stay until we have valid tpt */
2052 if (current_tpt == IWL_INVALID_VALUE) {
2053 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2054 return TPC_ACTION_STAY;
2055 }
2056
2057 /* Too many failures, increase txp */
2058 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2059 current_tpt == 0) {
2060 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2061 return TPC_ACTION_NO_RESTIRCTION;
2062 }
2063
2064 /* try decreasing first if applicable */
2065 if (weak != TPC_INVALID) {
2066 if (weak_tpt == IWL_INVALID_VALUE &&
2067 (strong_tpt == IWL_INVALID_VALUE ||
2068 current_tpt >= strong_tpt)) {
2069 IWL_DEBUG_RATE(mvm,
2070 "no weak txp measurement. decrease txp\n");
2071 return TPC_ACTION_DECREASE;
2072 }
2073
2074 if (weak_tpt > current_tpt) {
2075 IWL_DEBUG_RATE(mvm,
2076 "lower txp has better tpt. decrease txp\n");
2077 return TPC_ACTION_DECREASE;
2078 }
2079 }
2080
2081 /* next, increase if needed */
2082 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2083 strong != TPC_INVALID) {
2084 if (weak_tpt == IWL_INVALID_VALUE &&
2085 strong_tpt != IWL_INVALID_VALUE &&
2086 current_tpt < strong_tpt) {
2087 IWL_DEBUG_RATE(mvm,
2088 "higher txp has better tpt. increase txp\n");
2089 return TPC_ACTION_INCREASE;
2090 }
2091
2092 if (weak_tpt < current_tpt &&
2093 (strong_tpt == IWL_INVALID_VALUE ||
2094 strong_tpt > current_tpt)) {
2095 IWL_DEBUG_RATE(mvm,
2096 "lower txp has worse tpt. increase txp\n");
2097 return TPC_ACTION_INCREASE;
2098 }
2099 }
2100
2101 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2102 return TPC_ACTION_STAY;
2103 }
2104
2105 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2106 struct ieee80211_sta *sta,
2107 struct iwl_lq_sta *lq_sta,
2108 struct iwl_scale_tbl_info *tbl)
2109 {
2110 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2111 struct ieee80211_vif *vif = mvm_sta->vif;
2112 struct ieee80211_chanctx_conf *chanctx_conf;
2113 enum ieee80211_band band;
2114 struct iwl_rate_scale_data *window;
2115 struct rs_rate *rate = &tbl->rate;
2116 enum tpc_action action;
2117 s32 sr;
2118 u8 cur = lq_sta->lq.reduced_tpc;
2119 int current_tpt;
2120 int weak, strong;
2121 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2122
2123 #ifdef CONFIG_MAC80211_DEBUGFS
2124 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2125 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2126 lq_sta->pers.dbg_fixed_txp_reduction);
2127 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2128 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2129 }
2130 #endif
2131
2132 rcu_read_lock();
2133 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2134 if (WARN_ON(!chanctx_conf))
2135 band = IEEE80211_NUM_BANDS;
2136 else
2137 band = chanctx_conf->def.chan->band;
2138 rcu_read_unlock();
2139
2140 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2141 IWL_DEBUG_RATE(mvm,
2142 "tpc is not allowed. remove txp restrictions\n");
2143 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2144 return cur != TPC_NO_REDUCTION;
2145 }
2146
2147 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2148
2149 /* Collect measured throughputs for current and adjacent rates */
2150 window = tbl->tpc_win;
2151 sr = window[cur].success_ratio;
2152 current_tpt = window[cur].average_tpt;
2153 if (weak != TPC_INVALID)
2154 weak_tpt = window[weak].average_tpt;
2155 if (strong != TPC_INVALID)
2156 strong_tpt = window[strong].average_tpt;
2157
2158 IWL_DEBUG_RATE(mvm,
2159 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2160 cur, current_tpt, sr, weak, strong,
2161 weak_tpt, strong_tpt);
2162
2163 action = rs_get_tpc_action(mvm, sr, weak, strong,
2164 current_tpt, weak_tpt, strong_tpt);
2165
2166 /* override actions if we are on the edge */
2167 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2168 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2169 action = TPC_ACTION_STAY;
2170 } else if (strong == TPC_INVALID &&
2171 (action == TPC_ACTION_INCREASE ||
2172 action == TPC_ACTION_NO_RESTIRCTION)) {
2173 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2174 action = TPC_ACTION_STAY;
2175 }
2176
2177 switch (action) {
2178 case TPC_ACTION_DECREASE:
2179 lq_sta->lq.reduced_tpc = weak;
2180 return true;
2181 case TPC_ACTION_INCREASE:
2182 lq_sta->lq.reduced_tpc = strong;
2183 return true;
2184 case TPC_ACTION_NO_RESTIRCTION:
2185 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2186 return true;
2187 case TPC_ACTION_STAY:
2188 /* do nothing */
2189 break;
2190 }
2191 return false;
2192 }
2193
2194 /*
2195 * Do rate scaling and search for new modulation mode.
2196 */
2197 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2198 struct ieee80211_sta *sta,
2199 struct iwl_lq_sta *lq_sta,
2200 int tid)
2201 {
2202 int low = IWL_RATE_INVALID;
2203 int high = IWL_RATE_INVALID;
2204 int index;
2205 struct iwl_rate_scale_data *window = NULL;
2206 int current_tpt = IWL_INVALID_VALUE;
2207 int low_tpt = IWL_INVALID_VALUE;
2208 int high_tpt = IWL_INVALID_VALUE;
2209 u32 fail_count;
2210 enum rs_action scale_action = RS_ACTION_STAY;
2211 u16 rate_mask;
2212 u8 update_lq = 0;
2213 struct iwl_scale_tbl_info *tbl, *tbl1;
2214 u8 active_tbl = 0;
2215 u8 done_search = 0;
2216 u16 high_low;
2217 s32 sr;
2218 u8 prev_agg = lq_sta->is_agg;
2219 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2220 struct iwl_mvm_tid_data *tid_data;
2221 struct rs_rate *rate;
2222
2223 lq_sta->is_agg = !!sta_priv->agg_tids;
2224
2225 /*
2226 * Select rate-scale / modulation-mode table to work with in
2227 * the rest of this function: "search" if searching for better
2228 * modulation mode, or "active" if doing rate scaling within a mode.
2229 */
2230 if (!lq_sta->search_better_tbl)
2231 active_tbl = lq_sta->active_tbl;
2232 else
2233 active_tbl = 1 - lq_sta->active_tbl;
2234
2235 tbl = &(lq_sta->lq_info[active_tbl]);
2236 rate = &tbl->rate;
2237
2238 if (prev_agg != lq_sta->is_agg) {
2239 IWL_DEBUG_RATE(mvm,
2240 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2241 prev_agg, lq_sta->is_agg);
2242 rs_set_expected_tpt_table(lq_sta, tbl);
2243 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2244 }
2245
2246 /* current tx rate */
2247 index = rate->index;
2248
2249 /* rates available for this association, and for modulation mode */
2250 rate_mask = rs_get_supported_rates(lq_sta, rate);
2251
2252 if (!(BIT(index) & rate_mask)) {
2253 IWL_ERR(mvm, "Current Rate is not valid\n");
2254 if (lq_sta->search_better_tbl) {
2255 /* revert to active table if search table is not valid*/
2256 rate->type = LQ_NONE;
2257 lq_sta->search_better_tbl = 0;
2258 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2259 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2260 }
2261 return;
2262 }
2263
2264 /* Get expected throughput table and history window for current rate */
2265 if (!tbl->expected_tpt) {
2266 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2267 return;
2268 }
2269
2270 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2271 window = &(tbl->win[index]);
2272
2273 /*
2274 * If there is not enough history to calculate actual average
2275 * throughput, keep analyzing results of more tx frames, without
2276 * changing rate or mode (bypass most of the rest of this function).
2277 * Set up new rate table in uCode only if old rate is not supported
2278 * in current association (use new rate found above).
2279 */
2280 fail_count = window->counter - window->success_counter;
2281 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2282 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2283 IWL_DEBUG_RATE(mvm,
2284 "%s: Test Window: succ %d total %d\n",
2285 rs_pretty_rate(rate),
2286 window->success_counter, window->counter);
2287
2288 /* Can't calculate this yet; not enough history */
2289 window->average_tpt = IWL_INVALID_VALUE;
2290
2291 /* Should we stay with this modulation mode,
2292 * or search for a new one? */
2293 rs_stay_in_table(lq_sta, false);
2294
2295 return;
2296 }
2297
2298 /* If we are searching for better modulation mode, check success. */
2299 if (lq_sta->search_better_tbl) {
2300 /* If good success, continue using the "search" mode;
2301 * no need to send new link quality command, since we're
2302 * continuing to use the setup that we've been trying. */
2303 if (window->average_tpt > lq_sta->last_tpt) {
2304 IWL_DEBUG_RATE(mvm,
2305 "SWITCHING TO NEW TABLE SR: %d "
2306 "cur-tpt %d old-tpt %d\n",
2307 window->success_ratio,
2308 window->average_tpt,
2309 lq_sta->last_tpt);
2310
2311 /* Swap tables; "search" becomes "active" */
2312 lq_sta->active_tbl = active_tbl;
2313 current_tpt = window->average_tpt;
2314 /* Else poor success; go back to mode in "active" table */
2315 } else {
2316 IWL_DEBUG_RATE(mvm,
2317 "GOING BACK TO THE OLD TABLE: SR %d "
2318 "cur-tpt %d old-tpt %d\n",
2319 window->success_ratio,
2320 window->average_tpt,
2321 lq_sta->last_tpt);
2322
2323 /* Nullify "search" table */
2324 rate->type = LQ_NONE;
2325
2326 /* Revert to "active" table */
2327 active_tbl = lq_sta->active_tbl;
2328 tbl = &(lq_sta->lq_info[active_tbl]);
2329
2330 /* Revert to "active" rate and throughput info */
2331 index = tbl->rate.index;
2332 current_tpt = lq_sta->last_tpt;
2333
2334 /* Need to set up a new rate table in uCode */
2335 update_lq = 1;
2336 }
2337
2338 /* Either way, we've made a decision; modulation mode
2339 * search is done, allow rate adjustment next time. */
2340 lq_sta->search_better_tbl = 0;
2341 done_search = 1; /* Don't switch modes below! */
2342 goto lq_update;
2343 }
2344
2345 /* (Else) not in search of better modulation mode, try for better
2346 * starting rate, while staying in this mode. */
2347 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2348 low = high_low & 0xff;
2349 high = (high_low >> 8) & 0xff;
2350
2351 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2352
2353 sr = window->success_ratio;
2354
2355 /* Collect measured throughputs for current and adjacent rates */
2356 current_tpt = window->average_tpt;
2357 if (low != IWL_RATE_INVALID)
2358 low_tpt = tbl->win[low].average_tpt;
2359 if (high != IWL_RATE_INVALID)
2360 high_tpt = tbl->win[high].average_tpt;
2361
2362 IWL_DEBUG_RATE(mvm,
2363 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2364 rs_pretty_rate(rate), current_tpt, sr,
2365 low, high, low_tpt, high_tpt);
2366
2367 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2368 current_tpt, low_tpt, high_tpt);
2369
2370 /* Force a search in case BT doesn't like us being in MIMO */
2371 if (is_mimo(rate) &&
2372 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2373 IWL_DEBUG_RATE(mvm,
2374 "BT Coex forbids MIMO. Search for new config\n");
2375 rs_stay_in_table(lq_sta, true);
2376 goto lq_update;
2377 }
2378
2379 switch (scale_action) {
2380 case RS_ACTION_DOWNSCALE:
2381 /* Decrease starting rate, update uCode's rate table */
2382 if (low != IWL_RATE_INVALID) {
2383 update_lq = 1;
2384 index = low;
2385 } else {
2386 IWL_DEBUG_RATE(mvm,
2387 "At the bottom rate. Can't decrease\n");
2388 }
2389
2390 break;
2391 case RS_ACTION_UPSCALE:
2392 /* Increase starting rate, update uCode's rate table */
2393 if (high != IWL_RATE_INVALID) {
2394 update_lq = 1;
2395 index = high;
2396 } else {
2397 IWL_DEBUG_RATE(mvm,
2398 "At the top rate. Can't increase\n");
2399 }
2400
2401 break;
2402 case RS_ACTION_STAY:
2403 /* No change */
2404 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2405 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2406 break;
2407 default:
2408 break;
2409 }
2410
2411 lq_update:
2412 /* Replace uCode's rate table for the destination station. */
2413 if (update_lq) {
2414 tbl->rate.index = index;
2415 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2416 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2417 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2418 }
2419
2420 rs_stay_in_table(lq_sta, false);
2421
2422 /*
2423 * Search for new modulation mode if we're:
2424 * 1) Not changing rates right now
2425 * 2) Not just finishing up a search
2426 * 3) Allowing a new search
2427 */
2428 if (!update_lq && !done_search &&
2429 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2430 && window->counter) {
2431 enum rs_column next_column;
2432
2433 /* Save current throughput to compare with "search" throughput*/
2434 lq_sta->last_tpt = current_tpt;
2435
2436 IWL_DEBUG_RATE(mvm,
2437 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2438 update_lq, done_search, lq_sta->rs_state,
2439 window->counter);
2440
2441 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2442 if (next_column != RS_COLUMN_INVALID) {
2443 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2444 next_column);
2445 if (!ret)
2446 lq_sta->search_better_tbl = 1;
2447 } else {
2448 IWL_DEBUG_RATE(mvm,
2449 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2450 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2451 }
2452
2453 /* If new "search" mode was selected, set up in uCode table */
2454 if (lq_sta->search_better_tbl) {
2455 /* Access the "search" table, clear its history. */
2456 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2457 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2458
2459 /* Use new "search" start rate */
2460 index = tbl->rate.index;
2461
2462 rs_dump_rate(mvm, &tbl->rate,
2463 "Switch to SEARCH TABLE:");
2464 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2465 } else {
2466 done_search = 1;
2467 }
2468 }
2469
2470 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2471 /* If the "active" (non-search) mode was legacy,
2472 * and we've tried switching antennas,
2473 * but we haven't been able to try HT modes (not available),
2474 * stay with best antenna legacy modulation for a while
2475 * before next round of mode comparisons. */
2476 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2477 if (is_legacy(&tbl1->rate)) {
2478 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2479
2480 if (tid != IWL_MAX_TID_COUNT) {
2481 tid_data = &sta_priv->tid_data[tid];
2482 if (tid_data->state != IWL_AGG_OFF) {
2483 IWL_DEBUG_RATE(mvm,
2484 "Stop aggregation on tid %d\n",
2485 tid);
2486 ieee80211_stop_tx_ba_session(sta, tid);
2487 }
2488 }
2489 rs_set_stay_in_table(mvm, 1, lq_sta);
2490 } else {
2491 /* If we're in an HT mode, and all 3 mode switch actions
2492 * have been tried and compared, stay in this best modulation
2493 * mode for a while before next round of mode comparisons. */
2494 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2495 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2496 (tid != IWL_MAX_TID_COUNT)) {
2497 tid_data = &sta_priv->tid_data[tid];
2498 if (tid_data->state == IWL_AGG_OFF) {
2499 IWL_DEBUG_RATE(mvm,
2500 "try to aggregate tid %d\n",
2501 tid);
2502 rs_tl_turn_on_agg(mvm, tid,
2503 lq_sta, sta);
2504 }
2505 }
2506 rs_set_stay_in_table(mvm, 0, lq_sta);
2507 }
2508 }
2509 }
2510
2511 struct rs_init_rate_info {
2512 s8 rssi;
2513 u8 rate_idx;
2514 };
2515
2516 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2517 { -60, IWL_RATE_54M_INDEX },
2518 { -64, IWL_RATE_48M_INDEX },
2519 { -68, IWL_RATE_36M_INDEX },
2520 { -80, IWL_RATE_24M_INDEX },
2521 { -84, IWL_RATE_18M_INDEX },
2522 { -85, IWL_RATE_12M_INDEX },
2523 { -86, IWL_RATE_11M_INDEX },
2524 { -88, IWL_RATE_5M_INDEX },
2525 { -90, IWL_RATE_2M_INDEX },
2526 { S8_MIN, IWL_RATE_1M_INDEX },
2527 };
2528
2529 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2530 { -60, IWL_RATE_54M_INDEX },
2531 { -64, IWL_RATE_48M_INDEX },
2532 { -72, IWL_RATE_36M_INDEX },
2533 { -80, IWL_RATE_24M_INDEX },
2534 { -84, IWL_RATE_18M_INDEX },
2535 { -85, IWL_RATE_12M_INDEX },
2536 { -87, IWL_RATE_9M_INDEX },
2537 { S8_MIN, IWL_RATE_6M_INDEX },
2538 };
2539
2540 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2541 { -60, IWL_RATE_MCS_7_INDEX },
2542 { -64, IWL_RATE_MCS_6_INDEX },
2543 { -68, IWL_RATE_MCS_5_INDEX },
2544 { -72, IWL_RATE_MCS_4_INDEX },
2545 { -80, IWL_RATE_MCS_3_INDEX },
2546 { -84, IWL_RATE_MCS_2_INDEX },
2547 { -85, IWL_RATE_MCS_1_INDEX },
2548 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2549 };
2550
2551 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2552 { -60, IWL_RATE_MCS_8_INDEX },
2553 { -64, IWL_RATE_MCS_7_INDEX },
2554 { -68, IWL_RATE_MCS_6_INDEX },
2555 { -72, IWL_RATE_MCS_5_INDEX },
2556 { -80, IWL_RATE_MCS_4_INDEX },
2557 { -84, IWL_RATE_MCS_3_INDEX },
2558 { -85, IWL_RATE_MCS_2_INDEX },
2559 { -87, IWL_RATE_MCS_1_INDEX },
2560 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2561 };
2562
2563 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
2564 { -60, IWL_RATE_MCS_9_INDEX },
2565 { -64, IWL_RATE_MCS_8_INDEX },
2566 { -68, IWL_RATE_MCS_7_INDEX },
2567 { -72, IWL_RATE_MCS_6_INDEX },
2568 { -80, IWL_RATE_MCS_5_INDEX },
2569 { -84, IWL_RATE_MCS_4_INDEX },
2570 { -85, IWL_RATE_MCS_3_INDEX },
2571 { -87, IWL_RATE_MCS_2_INDEX },
2572 { -88, IWL_RATE_MCS_1_INDEX },
2573 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2574 };
2575
2576 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2577
2578 /* Init the optimal rate based on STA caps
2579 * This combined with rssi is used to report the last tx rate
2580 * to userspace when we haven't transmitted enough frames.
2581 */
2582 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2583 struct ieee80211_sta *sta,
2584 struct iwl_lq_sta *lq_sta)
2585 {
2586 struct rs_rate *rate = &lq_sta->optimal_rate;
2587
2588 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2589 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2590 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2591 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2592 else if (lq_sta->band == IEEE80211_BAND_5GHZ)
2593 rate->type = LQ_LEGACY_A;
2594 else
2595 rate->type = LQ_LEGACY_G;
2596
2597 rate->bw = rs_bw_from_sta_bw(sta);
2598 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2599
2600 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2601
2602 if (is_mimo(rate)) {
2603 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2604 } else if (is_siso(rate)) {
2605 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2606 } else {
2607 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2608
2609 if (lq_sta->band == IEEE80211_BAND_5GHZ) {
2610 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2611 lq_sta->optimal_nentries =
2612 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2613 } else {
2614 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2615 lq_sta->optimal_nentries =
2616 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2617 }
2618 }
2619
2620 if (is_vht(rate)) {
2621 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2622 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2623 lq_sta->optimal_nentries =
2624 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2625 } else {
2626 lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
2627 lq_sta->optimal_nentries =
2628 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2629 }
2630 } else if (is_ht(rate)) {
2631 lq_sta->optimal_rates = rs_optimal_rates_ht;
2632 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2633 }
2634 }
2635
2636 /* Compute the optimal rate index based on RSSI */
2637 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2638 struct iwl_lq_sta *lq_sta)
2639 {
2640 struct rs_rate *rate = &lq_sta->optimal_rate;
2641 int i;
2642
2643 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2644 BITS_PER_LONG);
2645
2646 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2647 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2648
2649 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2650 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2651 rate->index = rate_idx;
2652 break;
2653 }
2654 }
2655
2656 return rate;
2657 }
2658
2659 /* Choose an initial legacy rate and antenna to use based on the RSSI
2660 * of last Rx
2661 */
2662 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2663 struct ieee80211_sta *sta,
2664 struct iwl_lq_sta *lq_sta,
2665 enum ieee80211_band band,
2666 struct rs_rate *rate)
2667 {
2668 int i, nentries;
2669 unsigned long active_rate;
2670 s8 best_rssi = S8_MIN;
2671 u8 best_ant = ANT_NONE;
2672 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2673 const struct rs_init_rate_info *initial_rates;
2674
2675 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2676 if (!(lq_sta->pers.chains & BIT(i)))
2677 continue;
2678
2679 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2680 best_rssi = lq_sta->pers.chain_signal[i];
2681 best_ant = BIT(i);
2682 }
2683 }
2684
2685 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2686 rs_pretty_ant(best_ant), best_rssi);
2687
2688 if (best_ant != ANT_A && best_ant != ANT_B)
2689 rate->ant = first_antenna(valid_tx_ant);
2690 else
2691 rate->ant = best_ant;
2692
2693 rate->sgi = false;
2694 rate->ldpc = false;
2695 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2696
2697 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2698 BITS_PER_LONG);
2699
2700 if (band == IEEE80211_BAND_5GHZ) {
2701 rate->type = LQ_LEGACY_A;
2702 initial_rates = rs_optimal_rates_5ghz_legacy;
2703 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2704 } else {
2705 rate->type = LQ_LEGACY_G;
2706 initial_rates = rs_optimal_rates_24ghz_legacy;
2707 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2708 }
2709
2710 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2711 goto out;
2712
2713 /* Start from a higher rate if the corresponding debug capability
2714 * is enabled. The rate is chosen according to AP capabilities.
2715 * In case of VHT/HT when the rssi is low fallback to the case of
2716 * legacy rates.
2717 */
2718 if (sta->vht_cap.vht_supported &&
2719 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2720 if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) {
2721 initial_rates = rs_optimal_rates_vht_40_80mhz;
2722 nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2723 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
2724 rate->bw = RATE_MCS_CHAN_WIDTH_80;
2725 else
2726 rate->bw = RATE_MCS_CHAN_WIDTH_40;
2727 } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) {
2728 initial_rates = rs_optimal_rates_vht_20mhz;
2729 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2730 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2731 } else {
2732 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2733 goto out;
2734 }
2735 active_rate = lq_sta->active_siso_rate;
2736 rate->type = LQ_VHT_SISO;
2737 } else if (sta->ht_cap.ht_supported &&
2738 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2739 initial_rates = rs_optimal_rates_ht;
2740 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2741 active_rate = lq_sta->active_siso_rate;
2742 rate->type = LQ_HT_SISO;
2743 } else {
2744 active_rate = lq_sta->active_legacy_rate;
2745 }
2746
2747 for (i = 0; i < nentries; i++) {
2748 int rate_idx = initial_rates[i].rate_idx;
2749
2750 if ((best_rssi >= initial_rates[i].rssi) &&
2751 (BIT(rate_idx) & active_rate)) {
2752 rate->index = rate_idx;
2753 break;
2754 }
2755 }
2756
2757 out:
2758 rs_dump_rate(mvm, rate, "INITIAL");
2759 }
2760
2761 /* Save info about RSSI of last Rx */
2762 void rs_update_last_rssi(struct iwl_mvm *mvm,
2763 struct iwl_lq_sta *lq_sta,
2764 struct ieee80211_rx_status *rx_status)
2765 {
2766 int i;
2767
2768 lq_sta->pers.chains = rx_status->chains;
2769 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2770 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2771 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2772 lq_sta->pers.last_rssi = S8_MIN;
2773
2774 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2775 if (!(lq_sta->pers.chains & BIT(i)))
2776 continue;
2777
2778 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2779 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2780 }
2781 }
2782
2783 /**
2784 * rs_initialize_lq - Initialize a station's hardware rate table
2785 *
2786 * The uCode's station table contains a table of fallback rates
2787 * for automatic fallback during transmission.
2788 *
2789 * NOTE: This sets up a default set of values. These will be replaced later
2790 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2791 * rc80211_simple.
2792 *
2793 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2794 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2795 * which requires station table entry to exist).
2796 */
2797 static void rs_initialize_lq(struct iwl_mvm *mvm,
2798 struct ieee80211_sta *sta,
2799 struct iwl_lq_sta *lq_sta,
2800 enum ieee80211_band band,
2801 bool init)
2802 {
2803 struct iwl_scale_tbl_info *tbl;
2804 struct rs_rate *rate;
2805 u8 active_tbl = 0;
2806
2807 if (!sta || !lq_sta)
2808 return;
2809
2810 if (!lq_sta->search_better_tbl)
2811 active_tbl = lq_sta->active_tbl;
2812 else
2813 active_tbl = 1 - lq_sta->active_tbl;
2814
2815 tbl = &(lq_sta->lq_info[active_tbl]);
2816 rate = &tbl->rate;
2817
2818 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2819 rs_init_optimal_rate(mvm, sta, lq_sta);
2820
2821 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2822 tbl->column = rs_get_column_from_rate(rate);
2823
2824 rs_set_expected_tpt_table(lq_sta, tbl);
2825 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2826 /* TODO restore station should remember the lq cmd */
2827 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2828 }
2829
2830 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2831 struct ieee80211_tx_rate_control *txrc)
2832 {
2833 struct sk_buff *skb = txrc->skb;
2834 struct iwl_op_mode *op_mode __maybe_unused =
2835 (struct iwl_op_mode *)mvm_r;
2836 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2838 struct iwl_lq_sta *lq_sta = mvm_sta;
2839 struct rs_rate *optimal_rate;
2840 u32 last_ucode_rate;
2841
2842 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2843 /* if vif isn't initialized mvm doesn't know about
2844 * this station, so don't do anything with the it
2845 */
2846 sta = NULL;
2847 mvm_sta = NULL;
2848 }
2849
2850 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2851
2852 /* Treat uninitialized rate scaling data same as non-existing. */
2853 if (lq_sta && !lq_sta->pers.drv) {
2854 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2855 mvm_sta = NULL;
2856 }
2857
2858 /* Send management frames and NO_ACK data using lowest rate. */
2859 if (rate_control_send_low(sta, mvm_sta, txrc))
2860 return;
2861
2862 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2863 info->band, &info->control.rates[0]);
2864 info->control.rates[0].count = 1;
2865
2866 /* Report the optimal rate based on rssi and STA caps if we haven't
2867 * converged yet (too little traffic) or exploring other modulations
2868 */
2869 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2870 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2871 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2872 optimal_rate);
2873 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2874 &txrc->reported_rate);
2875 }
2876 }
2877
2878 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2879 gfp_t gfp)
2880 {
2881 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2882 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2883 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2884 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2885
2886 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2887
2888 lq_sta->pers.drv = mvm;
2889 #ifdef CONFIG_MAC80211_DEBUGFS
2890 lq_sta->pers.dbg_fixed_rate = 0;
2891 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2892 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2893 #endif
2894 lq_sta->pers.chains = 0;
2895 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2896 lq_sta->pers.last_rssi = S8_MIN;
2897
2898 return &sta_priv->lq_sta;
2899 }
2900
2901 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2902 int nss)
2903 {
2904 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2905 (0x3 << (2 * (nss - 1)));
2906 rx_mcs >>= (2 * (nss - 1));
2907
2908 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2909 return IWL_RATE_MCS_7_INDEX;
2910 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2911 return IWL_RATE_MCS_8_INDEX;
2912 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2913 return IWL_RATE_MCS_9_INDEX;
2914
2915 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2916 return -1;
2917 }
2918
2919 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2920 struct ieee80211_sta_vht_cap *vht_cap,
2921 struct iwl_lq_sta *lq_sta)
2922 {
2923 int i;
2924 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2925
2926 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2927 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2928 if (i == IWL_RATE_9M_INDEX)
2929 continue;
2930
2931 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2932 if (i == IWL_RATE_MCS_9_INDEX &&
2933 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2934 continue;
2935
2936 lq_sta->active_siso_rate |= BIT(i);
2937 }
2938 }
2939
2940 if (sta->rx_nss < 2)
2941 return;
2942
2943 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2944 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2945 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2946 if (i == IWL_RATE_9M_INDEX)
2947 continue;
2948
2949 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2950 if (i == IWL_RATE_MCS_9_INDEX &&
2951 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2952 continue;
2953
2954 lq_sta->active_mimo2_rate |= BIT(i);
2955 }
2956 }
2957 }
2958
2959 static void rs_ht_init(struct iwl_mvm *mvm,
2960 struct ieee80211_sta *sta,
2961 struct iwl_lq_sta *lq_sta,
2962 struct ieee80211_sta_ht_cap *ht_cap)
2963 {
2964 /* active_siso_rate mask includes 9 MBits (bit 5),
2965 * and CCK (bits 0-3), supp_rates[] does not;
2966 * shift to convert format, force 9 MBits off.
2967 */
2968 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2969 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2970 lq_sta->active_siso_rate &= ~((u16)0x2);
2971 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2972
2973 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2974 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2975 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2976 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2977
2978 if (mvm->cfg->ht_params->ldpc &&
2979 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2980 lq_sta->ldpc = true;
2981
2982 if (mvm->cfg->ht_params->stbc &&
2983 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2984 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2985 lq_sta->stbc_capable = true;
2986
2987 lq_sta->is_vht = false;
2988 }
2989
2990 static void rs_vht_init(struct iwl_mvm *mvm,
2991 struct ieee80211_sta *sta,
2992 struct iwl_lq_sta *lq_sta,
2993 struct ieee80211_sta_vht_cap *vht_cap)
2994 {
2995 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2996
2997 if (mvm->cfg->ht_params->ldpc &&
2998 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2999 lq_sta->ldpc = true;
3000
3001 if (mvm->cfg->ht_params->stbc &&
3002 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3003 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3004 lq_sta->stbc_capable = true;
3005
3006 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3007 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3008 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3009 lq_sta->bfer_capable = true;
3010
3011 lq_sta->is_vht = true;
3012 }
3013
3014 #ifdef CONFIG_IWLWIFI_DEBUGFS
3015 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3016 {
3017 spin_lock_bh(&mvm->drv_stats_lock);
3018 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3019 spin_unlock_bh(&mvm->drv_stats_lock);
3020 }
3021
3022 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3023 {
3024 u8 nss = 0, mcs = 0;
3025
3026 spin_lock(&mvm->drv_stats_lock);
3027
3028 if (agg)
3029 mvm->drv_rx_stats.agg_frames++;
3030
3031 mvm->drv_rx_stats.success_frames++;
3032
3033 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3034 case RATE_MCS_CHAN_WIDTH_20:
3035 mvm->drv_rx_stats.bw_20_frames++;
3036 break;
3037 case RATE_MCS_CHAN_WIDTH_40:
3038 mvm->drv_rx_stats.bw_40_frames++;
3039 break;
3040 case RATE_MCS_CHAN_WIDTH_80:
3041 mvm->drv_rx_stats.bw_80_frames++;
3042 break;
3043 default:
3044 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3045 }
3046
3047 if (rate & RATE_MCS_HT_MSK) {
3048 mvm->drv_rx_stats.ht_frames++;
3049 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
3050 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3051 } else if (rate & RATE_MCS_VHT_MSK) {
3052 mvm->drv_rx_stats.vht_frames++;
3053 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3054 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3055 RATE_VHT_MCS_NSS_POS) + 1;
3056 } else {
3057 mvm->drv_rx_stats.legacy_frames++;
3058 }
3059
3060 if (nss == 1)
3061 mvm->drv_rx_stats.siso_frames++;
3062 else if (nss == 2)
3063 mvm->drv_rx_stats.mimo2_frames++;
3064
3065 if (rate & RATE_MCS_SGI_MSK)
3066 mvm->drv_rx_stats.sgi_frames++;
3067 else
3068 mvm->drv_rx_stats.ngi_frames++;
3069
3070 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3071 mvm->drv_rx_stats.last_frame_idx =
3072 (mvm->drv_rx_stats.last_frame_idx + 1) %
3073 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3074
3075 spin_unlock(&mvm->drv_stats_lock);
3076 }
3077 #endif
3078
3079 /*
3080 * Called after adding a new station to initialize rate scaling
3081 */
3082 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3083 enum ieee80211_band band, bool init)
3084 {
3085 int i, j;
3086 struct ieee80211_hw *hw = mvm->hw;
3087 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3088 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3089 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3090 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3091 struct ieee80211_supported_band *sband;
3092 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3093
3094 /* clear all non-persistent lq data */
3095 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3096
3097 sband = hw->wiphy->bands[band];
3098
3099 lq_sta->lq.sta_id = sta_priv->sta_id;
3100
3101 for (j = 0; j < LQ_SIZE; j++)
3102 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3103
3104 lq_sta->flush_timer = 0;
3105 lq_sta->last_tx = jiffies;
3106
3107 IWL_DEBUG_RATE(mvm,
3108 "LQ: *** rate scale station global init for station %d ***\n",
3109 sta_priv->sta_id);
3110 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3111 * the lowest or the highest rate.. Could consider using RSSI from
3112 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3113 * after assoc.. */
3114
3115 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3116 lq_sta->band = sband->band;
3117 /*
3118 * active legacy rates as per supported rates bitmap
3119 */
3120 supp = sta->supp_rates[sband->band];
3121 lq_sta->active_legacy_rate = 0;
3122 for_each_set_bit(i, &supp, BITS_PER_LONG)
3123 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3124
3125 /* TODO: should probably account for rx_highest for both HT/VHT */
3126 if (!vht_cap || !vht_cap->vht_supported)
3127 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3128 else
3129 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3130
3131 lq_sta->max_legacy_rate_idx =
3132 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3133 lq_sta->max_siso_rate_idx =
3134 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3135 lq_sta->max_mimo2_rate_idx =
3136 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3137
3138 IWL_DEBUG_RATE(mvm,
3139 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3140 lq_sta->active_legacy_rate,
3141 lq_sta->active_siso_rate,
3142 lq_sta->active_mimo2_rate,
3143 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3144 lq_sta->bfer_capable);
3145 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3146 lq_sta->max_legacy_rate_idx,
3147 lq_sta->max_siso_rate_idx,
3148 lq_sta->max_mimo2_rate_idx);
3149
3150 /* These values will be overridden later */
3151 lq_sta->lq.single_stream_ant_msk =
3152 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3153 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3154
3155 /* as default allow aggregation for all tids */
3156 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3157 lq_sta->is_agg = 0;
3158 #ifdef CONFIG_IWLWIFI_DEBUGFS
3159 iwl_mvm_reset_frame_stats(mvm);
3160 #endif
3161 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3162 }
3163
3164 static void rs_rate_update(void *mvm_r,
3165 struct ieee80211_supported_band *sband,
3166 struct cfg80211_chan_def *chandef,
3167 struct ieee80211_sta *sta, void *priv_sta,
3168 u32 changed)
3169 {
3170 u8 tid;
3171 struct iwl_op_mode *op_mode =
3172 (struct iwl_op_mode *)mvm_r;
3173 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3174
3175 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3176 return;
3177
3178 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3179 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3180 ieee80211_stop_tx_ba_session(sta, tid);
3181
3182 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3183 }
3184
3185 #ifdef CONFIG_MAC80211_DEBUGFS
3186 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3187 struct iwl_lq_cmd *lq_cmd,
3188 enum ieee80211_band band,
3189 u32 ucode_rate)
3190 {
3191 struct rs_rate rate;
3192 int i;
3193 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3194 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3195 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3196
3197 for (i = 0; i < num_rates; i++)
3198 lq_cmd->rs_table[i] = ucode_rate_le32;
3199
3200 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3201
3202 if (is_mimo(&rate))
3203 lq_cmd->mimo_delim = num_rates - 1;
3204 else
3205 lq_cmd->mimo_delim = 0;
3206
3207 lq_cmd->reduced_tpc = 0;
3208
3209 if (num_of_ant(ant) == 1)
3210 lq_cmd->single_stream_ant_msk = ant;
3211
3212 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3213 }
3214 #endif /* CONFIG_MAC80211_DEBUGFS */
3215
3216 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3217 struct iwl_lq_sta *lq_sta,
3218 struct rs_rate *rate,
3219 __le32 *rs_table, int *rs_table_index,
3220 int num_rates, int num_retries,
3221 u8 valid_tx_ant, bool toggle_ant)
3222 {
3223 int i, j;
3224 __le32 ucode_rate;
3225 bool bottom_reached = false;
3226 int prev_rate_idx = rate->index;
3227 int end = LINK_QUAL_MAX_RETRY_NUM;
3228 int index = *rs_table_index;
3229
3230 for (i = 0; i < num_rates && index < end; i++) {
3231 for (j = 0; j < num_retries && index < end; j++, index++) {
3232 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3233 rate));
3234 rs_table[index] = ucode_rate;
3235 if (toggle_ant)
3236 rs_toggle_antenna(valid_tx_ant, rate);
3237 }
3238
3239 prev_rate_idx = rate->index;
3240 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3241 if (bottom_reached && !is_legacy(rate))
3242 break;
3243 }
3244
3245 if (!bottom_reached && !is_legacy(rate))
3246 rate->index = prev_rate_idx;
3247
3248 *rs_table_index = index;
3249 }
3250
3251 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3252 * column the rate table should look like this:
3253 *
3254 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3255 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3256 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3257 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3258 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3259 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3260 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3261 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3262 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3263 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3264 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3265 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3266 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3267 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3268 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3269 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3270 */
3271 static void rs_build_rates_table(struct iwl_mvm *mvm,
3272 struct ieee80211_sta *sta,
3273 struct iwl_lq_sta *lq_sta,
3274 const struct rs_rate *initial_rate)
3275 {
3276 struct rs_rate rate;
3277 int num_rates, num_retries, index = 0;
3278 u8 valid_tx_ant = 0;
3279 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3280 bool toggle_ant = false;
3281
3282 memcpy(&rate, initial_rate, sizeof(rate));
3283
3284 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3285
3286 /* TODO: remove old API when min FW API hits 14 */
3287 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3288 rs_stbc_allow(mvm, sta, lq_sta))
3289 rate.stbc = true;
3290
3291 if (is_siso(&rate)) {
3292 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3293 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3294 } else if (is_mimo(&rate)) {
3295 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3296 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3297 } else {
3298 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3299 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3300 toggle_ant = true;
3301 }
3302
3303 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3304 num_rates, num_retries, valid_tx_ant,
3305 toggle_ant);
3306
3307 rs_get_lower_rate_down_column(lq_sta, &rate);
3308
3309 if (is_siso(&rate)) {
3310 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3311 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3312 lq_cmd->mimo_delim = index;
3313 } else if (is_legacy(&rate)) {
3314 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3315 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3316 } else {
3317 WARN_ON_ONCE(1);
3318 }
3319
3320 toggle_ant = true;
3321
3322 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3323 num_rates, num_retries, valid_tx_ant,
3324 toggle_ant);
3325
3326 rs_get_lower_rate_down_column(lq_sta, &rate);
3327
3328 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3329 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3330
3331 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3332 num_rates, num_retries, valid_tx_ant,
3333 toggle_ant);
3334
3335 }
3336
3337 struct rs_bfer_active_iter_data {
3338 struct ieee80211_sta *exclude_sta;
3339 struct iwl_mvm_sta *bfer_mvmsta;
3340 };
3341
3342 static void rs_bfer_active_iter(void *_data,
3343 struct ieee80211_sta *sta)
3344 {
3345 struct rs_bfer_active_iter_data *data = _data;
3346 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3347 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3348 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3349
3350 if (sta == data->exclude_sta)
3351 return;
3352
3353 /* The current sta has BFER allowed */
3354 if (ss_params & LQ_SS_BFER_ALLOWED) {
3355 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3356
3357 data->bfer_mvmsta = mvmsta;
3358 }
3359 }
3360
3361 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3362 {
3363 int prio = -1;
3364 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3365
3366 switch (viftype) {
3367 case NL80211_IFTYPE_AP:
3368 case NL80211_IFTYPE_P2P_GO:
3369 prio = 3;
3370 break;
3371 case NL80211_IFTYPE_P2P_CLIENT:
3372 prio = 2;
3373 break;
3374 case NL80211_IFTYPE_STATION:
3375 prio = 1;
3376 break;
3377 default:
3378 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3379 prio = -1;
3380 }
3381
3382 return prio;
3383 }
3384
3385 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3386 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3387 struct iwl_mvm_sta *sta2)
3388 {
3389 int prio1 = rs_bfer_priority(sta1);
3390 int prio2 = rs_bfer_priority(sta2);
3391
3392 if (prio1 > prio2)
3393 return 1;
3394 if (prio1 < prio2)
3395 return -1;
3396 return 0;
3397 }
3398
3399 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3400 struct ieee80211_sta *sta,
3401 struct iwl_lq_sta *lq_sta,
3402 const struct rs_rate *initial_rate)
3403 {
3404 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3405 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3406 struct rs_bfer_active_iter_data data = {
3407 .exclude_sta = sta,
3408 .bfer_mvmsta = NULL,
3409 };
3410 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3411 u32 ss_params = LQ_SS_PARAMS_VALID;
3412
3413 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3414 goto out;
3415
3416 #ifdef CONFIG_MAC80211_DEBUGFS
3417 /* Check if forcing the decision is configured.
3418 * Note that SISO is forced by not allowing STBC or BFER
3419 */
3420 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3421 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3422 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3423 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3424
3425 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3426 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3427 lq_sta->pers.ss_force);
3428 goto out;
3429 }
3430 #endif
3431
3432 if (lq_sta->stbc_capable)
3433 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3434
3435 if (!lq_sta->bfer_capable)
3436 goto out;
3437
3438 ieee80211_iterate_stations_atomic(mvm->hw,
3439 rs_bfer_active_iter,
3440 &data);
3441 bfer_mvmsta = data.bfer_mvmsta;
3442
3443 /* This code is safe as it doesn't run concurrently for different
3444 * stations. This is guaranteed by the fact that calls to
3445 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3446 */
3447 if (!bfer_mvmsta) {
3448 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3449
3450 ss_params |= LQ_SS_BFER_ALLOWED;
3451 goto out;
3452 }
3453
3454 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3455 bfer_mvmsta->sta_id);
3456
3457 /* Disallow BFER on another STA if active and we're a higher priority */
3458 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3459 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3460 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3461
3462 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3463 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3464 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3465
3466 ss_params |= LQ_SS_BFER_ALLOWED;
3467 IWL_DEBUG_RATE(mvm,
3468 "Lower priority BFER sta found (%d). Switch BFER\n",
3469 bfer_mvmsta->sta_id);
3470 }
3471 out:
3472 lq_cmd->ss_params = cpu_to_le32(ss_params);
3473 }
3474
3475 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3476 struct ieee80211_sta *sta,
3477 struct iwl_lq_sta *lq_sta,
3478 const struct rs_rate *initial_rate)
3479 {
3480 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3481 struct iwl_mvm_sta *mvmsta;
3482 struct iwl_mvm_vif *mvmvif;
3483
3484 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3485 lq_cmd->agg_time_limit =
3486 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3487
3488 #ifdef CONFIG_MAC80211_DEBUGFS
3489 if (lq_sta->pers.dbg_fixed_rate) {
3490 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3491 lq_sta->band,
3492 lq_sta->pers.dbg_fixed_rate);
3493 return;
3494 }
3495 #endif
3496 if (WARN_ON_ONCE(!sta || !initial_rate))
3497 return;
3498
3499 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3500
3501 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3502 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3503
3504 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3505 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3506
3507 if (num_of_ant(initial_rate->ant) == 1)
3508 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3509
3510 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3511
3512 /*
3513 * In case of low latency, tell the firmware to leave a frame in the
3514 * Tx Fifo so that it can start a transaction in the same TxOP. This
3515 * basically allows the firmware to send bursts.
3516 */
3517 if (iwl_mvm_vif_low_latency(mvmvif))
3518 lq_cmd->agg_frame_cnt_limit--;
3519
3520 if (mvmsta->vif->p2p)
3521 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3522
3523 lq_cmd->agg_time_limit =
3524 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3525 }
3526
3527 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3528 {
3529 return hw->priv;
3530 }
3531 /* rate scale requires free function to be implemented */
3532 static void rs_free(void *mvm_rate)
3533 {
3534 return;
3535 }
3536
3537 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3538 void *mvm_sta)
3539 {
3540 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3541 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3542
3543 IWL_DEBUG_RATE(mvm, "enter\n");
3544 IWL_DEBUG_RATE(mvm, "leave\n");
3545 }
3546
3547 #ifdef CONFIG_MAC80211_DEBUGFS
3548 int rs_pretty_print_rate(char *buf, const u32 rate)
3549 {
3550
3551 char *type, *bw;
3552 u8 mcs = 0, nss = 0;
3553 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3554
3555 if (!(rate & RATE_MCS_HT_MSK) &&
3556 !(rate & RATE_MCS_VHT_MSK)) {
3557 int index = iwl_hwrate_to_plcp_idx(rate);
3558
3559 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3560 rs_pretty_ant(ant),
3561 index == IWL_RATE_INVALID ? "BAD" :
3562 iwl_rate_mcs[index].mbps);
3563 }
3564
3565 if (rate & RATE_MCS_VHT_MSK) {
3566 type = "VHT";
3567 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3568 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3569 >> RATE_VHT_MCS_NSS_POS) + 1;
3570 } else if (rate & RATE_MCS_HT_MSK) {
3571 type = "HT";
3572 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3573 } else {
3574 type = "Unknown"; /* shouldn't happen */
3575 }
3576
3577 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3578 case RATE_MCS_CHAN_WIDTH_20:
3579 bw = "20Mhz";
3580 break;
3581 case RATE_MCS_CHAN_WIDTH_40:
3582 bw = "40Mhz";
3583 break;
3584 case RATE_MCS_CHAN_WIDTH_80:
3585 bw = "80Mhz";
3586 break;
3587 case RATE_MCS_CHAN_WIDTH_160:
3588 bw = "160Mhz";
3589 break;
3590 default:
3591 bw = "BAD BW";
3592 }
3593
3594 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3595 type, rs_pretty_ant(ant), bw, mcs, nss,
3596 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3597 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3598 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3599 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3600 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3601 }
3602
3603 /**
3604 * Program the device to use fixed rate for frame transmit
3605 * This is for debugging/testing only
3606 * once the device start use fixed rate, we need to reload the module
3607 * to being back the normal operation.
3608 */
3609 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3610 struct iwl_lq_sta *lq_sta)
3611 {
3612 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3613 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3614 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3615
3616 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3617 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3618
3619 if (lq_sta->pers.dbg_fixed_rate) {
3620 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3621 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3622 }
3623 }
3624
3625 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3626 const char __user *user_buf, size_t count, loff_t *ppos)
3627 {
3628 struct iwl_lq_sta *lq_sta = file->private_data;
3629 struct iwl_mvm *mvm;
3630 char buf[64];
3631 size_t buf_size;
3632 u32 parsed_rate;
3633
3634 mvm = lq_sta->pers.drv;
3635 memset(buf, 0, sizeof(buf));
3636 buf_size = min(count, sizeof(buf) - 1);
3637 if (copy_from_user(buf, user_buf, buf_size))
3638 return -EFAULT;
3639
3640 if (sscanf(buf, "%x", &parsed_rate) == 1)
3641 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3642 else
3643 lq_sta->pers.dbg_fixed_rate = 0;
3644
3645 rs_program_fix_rate(mvm, lq_sta);
3646
3647 return count;
3648 }
3649
3650 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3651 char __user *user_buf, size_t count, loff_t *ppos)
3652 {
3653 char *buff;
3654 int desc = 0;
3655 int i = 0;
3656 ssize_t ret;
3657
3658 struct iwl_lq_sta *lq_sta = file->private_data;
3659 struct iwl_mvm *mvm;
3660 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3661 struct rs_rate *rate = &tbl->rate;
3662 u32 ss_params;
3663 mvm = lq_sta->pers.drv;
3664 buff = kmalloc(2048, GFP_KERNEL);
3665 if (!buff)
3666 return -ENOMEM;
3667
3668 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3669 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3670 lq_sta->total_failed, lq_sta->total_success,
3671 lq_sta->active_legacy_rate);
3672 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3673 lq_sta->pers.dbg_fixed_rate);
3674 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3675 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3676 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3677 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3678 desc += sprintf(buff+desc, "lq type %s\n",
3679 (is_legacy(rate)) ? "legacy" :
3680 is_vht(rate) ? "VHT" : "HT");
3681 if (!is_legacy(rate)) {
3682 desc += sprintf(buff + desc, " %s",
3683 (is_siso(rate)) ? "SISO" : "MIMO2");
3684 desc += sprintf(buff + desc, " %s",
3685 (is_ht20(rate)) ? "20MHz" :
3686 (is_ht40(rate)) ? "40MHz" :
3687 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3688 desc += sprintf(buff + desc, " %s %s %s\n",
3689 (rate->sgi) ? "SGI" : "NGI",
3690 (rate->ldpc) ? "LDPC" : "BCC",
3691 (lq_sta->is_agg) ? "AGG on" : "");
3692 }
3693 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3694 lq_sta->last_rate_n_flags);
3695 desc += sprintf(buff+desc,
3696 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3697 lq_sta->lq.flags,
3698 lq_sta->lq.mimo_delim,
3699 lq_sta->lq.single_stream_ant_msk,
3700 lq_sta->lq.dual_stream_ant_msk);
3701
3702 desc += sprintf(buff+desc,
3703 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3704 le16_to_cpu(lq_sta->lq.agg_time_limit),
3705 lq_sta->lq.agg_disable_start_th,
3706 lq_sta->lq.agg_frame_cnt_limit);
3707
3708 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3709 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3710 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3711 (ss_params & LQ_SS_PARAMS_VALID) ?
3712 "VALID" : "INVALID",
3713 (ss_params & LQ_SS_BFER_ALLOWED) ?
3714 ", BFER" : "",
3715 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3716 ", STBC" : "",
3717 (ss_params & LQ_SS_FORCE) ?
3718 ", FORCE" : "");
3719 desc += sprintf(buff+desc,
3720 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3721 lq_sta->lq.initial_rate_index[0],
3722 lq_sta->lq.initial_rate_index[1],
3723 lq_sta->lq.initial_rate_index[2],
3724 lq_sta->lq.initial_rate_index[3]);
3725
3726 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3727 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3728
3729 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3730 desc += rs_pretty_print_rate(buff+desc, r);
3731 }
3732
3733 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3734 kfree(buff);
3735 return ret;
3736 }
3737
3738 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3739 .write = rs_sta_dbgfs_scale_table_write,
3740 .read = rs_sta_dbgfs_scale_table_read,
3741 .open = simple_open,
3742 .llseek = default_llseek,
3743 };
3744 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3745 char __user *user_buf, size_t count, loff_t *ppos)
3746 {
3747 char *buff;
3748 int desc = 0;
3749 int i, j;
3750 ssize_t ret;
3751 struct iwl_scale_tbl_info *tbl;
3752 struct rs_rate *rate;
3753 struct iwl_lq_sta *lq_sta = file->private_data;
3754
3755 buff = kmalloc(1024, GFP_KERNEL);
3756 if (!buff)
3757 return -ENOMEM;
3758
3759 for (i = 0; i < LQ_SIZE; i++) {
3760 tbl = &(lq_sta->lq_info[i]);
3761 rate = &tbl->rate;
3762 desc += sprintf(buff+desc,
3763 "%s type=%d SGI=%d BW=%s DUP=0\n"
3764 "index=%d\n",
3765 lq_sta->active_tbl == i ? "*" : "x",
3766 rate->type,
3767 rate->sgi,
3768 is_ht20(rate) ? "20Mhz" :
3769 is_ht40(rate) ? "40Mhz" :
3770 is_ht80(rate) ? "80Mhz" : "ERR",
3771 rate->index);
3772 for (j = 0; j < IWL_RATE_COUNT; j++) {
3773 desc += sprintf(buff+desc,
3774 "counter=%d success=%d %%=%d\n",
3775 tbl->win[j].counter,
3776 tbl->win[j].success_counter,
3777 tbl->win[j].success_ratio);
3778 }
3779 }
3780 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3781 kfree(buff);
3782 return ret;
3783 }
3784
3785 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3786 .read = rs_sta_dbgfs_stats_table_read,
3787 .open = simple_open,
3788 .llseek = default_llseek,
3789 };
3790
3791 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3792 char __user *user_buf,
3793 size_t count, loff_t *ppos)
3794 {
3795 static const char * const column_name[] = {
3796 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3797 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3798 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3799 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3800 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3801 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3802 [RS_COLUMN_MIMO2] = "MIMO2",
3803 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3804 };
3805
3806 static const char * const rate_name[] = {
3807 [IWL_RATE_1M_INDEX] = "1M",
3808 [IWL_RATE_2M_INDEX] = "2M",
3809 [IWL_RATE_5M_INDEX] = "5.5M",
3810 [IWL_RATE_11M_INDEX] = "11M",
3811 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3812 [IWL_RATE_9M_INDEX] = "9M",
3813 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3814 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3815 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3816 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3817 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3818 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3819 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3820 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3821 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3822 };
3823
3824 char *buff, *pos, *endpos;
3825 int col, rate;
3826 ssize_t ret;
3827 struct iwl_lq_sta *lq_sta = file->private_data;
3828 struct rs_rate_stats *stats;
3829 static const size_t bufsz = 1024;
3830
3831 buff = kmalloc(bufsz, GFP_KERNEL);
3832 if (!buff)
3833 return -ENOMEM;
3834
3835 pos = buff;
3836 endpos = pos + bufsz;
3837
3838 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3839 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3840 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3841 pos += scnprintf(pos, endpos - pos, "\n");
3842
3843 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3844 pos += scnprintf(pos, endpos - pos,
3845 "%s,", column_name[col]);
3846
3847 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3848 stats = &(lq_sta->pers.tx_stats[col][rate]);
3849 pos += scnprintf(pos, endpos - pos,
3850 "%llu/%llu,",
3851 stats->success,
3852 stats->total);
3853 }
3854 pos += scnprintf(pos, endpos - pos, "\n");
3855 }
3856
3857 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3858 kfree(buff);
3859 return ret;
3860 }
3861
3862 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3863 const char __user *user_buf,
3864 size_t count, loff_t *ppos)
3865 {
3866 struct iwl_lq_sta *lq_sta = file->private_data;
3867 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3868
3869 return count;
3870 }
3871
3872 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3873 .read = rs_sta_dbgfs_drv_tx_stats_read,
3874 .write = rs_sta_dbgfs_drv_tx_stats_write,
3875 .open = simple_open,
3876 .llseek = default_llseek,
3877 };
3878
3879 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3880 char __user *user_buf,
3881 size_t count, loff_t *ppos)
3882 {
3883 struct iwl_lq_sta *lq_sta = file->private_data;
3884 char buf[12];
3885 int bufsz = sizeof(buf);
3886 int pos = 0;
3887 static const char * const ss_force_name[] = {
3888 [RS_SS_FORCE_NONE] = "none",
3889 [RS_SS_FORCE_STBC] = "stbc",
3890 [RS_SS_FORCE_BFER] = "bfer",
3891 [RS_SS_FORCE_SISO] = "siso",
3892 };
3893
3894 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3895 ss_force_name[lq_sta->pers.ss_force]);
3896 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3897 }
3898
3899 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3900 size_t count, loff_t *ppos)
3901 {
3902 struct iwl_mvm *mvm = lq_sta->pers.drv;
3903 int ret = 0;
3904
3905 if (!strncmp("none", buf, 4)) {
3906 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3907 } else if (!strncmp("siso", buf, 4)) {
3908 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3909 } else if (!strncmp("stbc", buf, 4)) {
3910 if (lq_sta->stbc_capable) {
3911 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3912 } else {
3913 IWL_ERR(mvm,
3914 "can't force STBC. peer doesn't support\n");
3915 ret = -EINVAL;
3916 }
3917 } else if (!strncmp("bfer", buf, 4)) {
3918 if (lq_sta->bfer_capable) {
3919 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3920 } else {
3921 IWL_ERR(mvm,
3922 "can't force BFER. peer doesn't support\n");
3923 ret = -EINVAL;
3924 }
3925 } else {
3926 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3927 ret = -EINVAL;
3928 }
3929 return ret ?: count;
3930 }
3931
3932 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3933 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3934 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3935 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3936 &iwl_dbgfs_##name##_ops)) \
3937 goto err; \
3938 } while (0)
3939
3940 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3941
3942 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3943 {
3944 struct iwl_lq_sta *lq_sta = priv_sta;
3945 struct iwl_mvm_sta *mvmsta;
3946
3947 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3948
3949 if (!mvmsta->vif)
3950 return;
3951
3952 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3953 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3954 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3955 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3956 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3957 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3958 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3959 &lq_sta->tx_agg_tid_en);
3960 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3961 &lq_sta->pers.dbg_fixed_txp_reduction);
3962
3963 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3964 return;
3965 err:
3966 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3967 }
3968
3969 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3970 {
3971 }
3972 #endif
3973
3974 /*
3975 * Initialization of rate scaling information is done by driver after
3976 * the station is added. Since mac80211 calls this function before a
3977 * station is added we ignore it.
3978 */
3979 static void rs_rate_init_stub(void *mvm_r,
3980 struct ieee80211_supported_band *sband,
3981 struct cfg80211_chan_def *chandef,
3982 struct ieee80211_sta *sta, void *mvm_sta)
3983 {
3984 }
3985
3986 static const struct rate_control_ops rs_mvm_ops = {
3987 .name = RS_NAME,
3988 .tx_status = rs_mac80211_tx_status,
3989 .get_rate = rs_get_rate,
3990 .rate_init = rs_rate_init_stub,
3991 .alloc = rs_alloc,
3992 .free = rs_free,
3993 .alloc_sta = rs_alloc_sta,
3994 .free_sta = rs_free_sta,
3995 .rate_update = rs_rate_update,
3996 #ifdef CONFIG_MAC80211_DEBUGFS
3997 .add_sta_debugfs = rs_add_debugfs,
3998 .remove_sta_debugfs = rs_remove_debugfs,
3999 #endif
4000 };
4001
4002 int iwl_mvm_rate_control_register(void)
4003 {
4004 return ieee80211_rate_control_register(&rs_mvm_ops);
4005 }
4006
4007 void iwl_mvm_rate_control_unregister(void)
4008 {
4009 ieee80211_rate_control_unregister(&rs_mvm_ops);
4010 }
4011
4012 /**
4013 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4014 * Tx protection, according to this request and previous requests,
4015 * and send the LQ command.
4016 * @mvmsta: The station
4017 * @enable: Enable Tx protection?
4018 */
4019 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4020 bool enable)
4021 {
4022 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4023
4024 lockdep_assert_held(&mvm->mutex);
4025
4026 if (enable) {
4027 if (mvmsta->tx_protection == 0)
4028 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4029 mvmsta->tx_protection++;
4030 } else {
4031 mvmsta->tx_protection--;
4032 if (mvmsta->tx_protection == 0)
4033 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4034 }
4035
4036 return iwl_mvm_send_lq_cmd(mvm, lq, false);
4037 }
Linux kernel - Deliverables
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