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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[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_0_INDEX) &&
560 (rate->index <= IWL_RATE_MCS_9_INDEX))
561 rate_str = ht_vht_rates[rate->index];
562 else
563 rate_str = "BAD_RATE";
564
565 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
566 rs_pretty_ant(rate->ant), rate_str);
567 return buf;
568 }
569
570 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
571 const char *prefix)
572 {
573 IWL_DEBUG_RATE(mvm,
574 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
575 prefix, rs_pretty_rate(rate), rate->bw,
576 rate->sgi, rate->ldpc, rate->stbc);
577 }
578
579 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
580 {
581 window->data = 0;
582 window->success_counter = 0;
583 window->success_ratio = IWL_INVALID_VALUE;
584 window->counter = 0;
585 window->average_tpt = IWL_INVALID_VALUE;
586 }
587
588 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
589 struct iwl_scale_tbl_info *tbl)
590 {
591 int i;
592
593 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
594 for (i = 0; i < IWL_RATE_COUNT; i++)
595 rs_rate_scale_clear_window(&tbl->win[i]);
596
597 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
598 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
599 }
600
601 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
602 {
603 return (ant_type & valid_antenna) == ant_type;
604 }
605
606 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
607 struct iwl_lq_sta *lq_data, u8 tid,
608 struct ieee80211_sta *sta)
609 {
610 int ret = -EAGAIN;
611
612 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
613 sta->addr, tid);
614 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
615 if (ret == -EAGAIN) {
616 /*
617 * driver and mac80211 is out of sync
618 * this might be cause by reloading firmware
619 * stop the tx ba session here
620 */
621 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
622 tid);
623 ieee80211_stop_tx_ba_session(sta, tid);
624 }
625 return ret;
626 }
627
628 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
629 struct iwl_lq_sta *lq_data,
630 struct ieee80211_sta *sta)
631 {
632 if (tid < IWL_MAX_TID_COUNT)
633 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
634 else
635 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
636 tid, IWL_MAX_TID_COUNT);
637 }
638
639 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
640 {
641 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
642 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
643 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
644 }
645
646 /*
647 * Static function to get the expected throughput from an iwl_scale_tbl_info
648 * that wraps a NULL pointer check
649 */
650 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
651 {
652 if (tbl->expected_tpt)
653 return tbl->expected_tpt[rs_index];
654 return 0;
655 }
656
657 /**
658 * rs_collect_tx_data - Update the success/failure sliding window
659 *
660 * We keep a sliding window of the last 62 packets transmitted
661 * at this rate. window->data contains the bitmask of successful
662 * packets.
663 */
664 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
665 struct iwl_scale_tbl_info *tbl,
666 int scale_index, int attempts, int successes,
667 struct iwl_rate_scale_data *window)
668 {
669 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
670 s32 fail_count, tpt;
671
672 /* Get expected throughput */
673 tpt = get_expected_tpt(tbl, scale_index);
674
675 /*
676 * Keep track of only the latest 62 tx frame attempts in this rate's
677 * history window; anything older isn't really relevant any more.
678 * If we have filled up the sliding window, drop the oldest attempt;
679 * if the oldest attempt (highest bit in bitmap) shows "success",
680 * subtract "1" from the success counter (this is the main reason
681 * we keep these bitmaps!).
682 */
683 while (attempts > 0) {
684 if (window->counter >= IWL_RATE_MAX_WINDOW) {
685 /* remove earliest */
686 window->counter = IWL_RATE_MAX_WINDOW - 1;
687
688 if (window->data & mask) {
689 window->data &= ~mask;
690 window->success_counter--;
691 }
692 }
693
694 /* Increment frames-attempted counter */
695 window->counter++;
696
697 /* Shift bitmap by one frame to throw away oldest history */
698 window->data <<= 1;
699
700 /* Mark the most recent #successes attempts as successful */
701 if (successes > 0) {
702 window->success_counter++;
703 window->data |= 0x1;
704 successes--;
705 }
706
707 attempts--;
708 }
709
710 /* Calculate current success ratio, avoid divide-by-0! */
711 if (window->counter > 0)
712 window->success_ratio = 128 * (100 * window->success_counter)
713 / window->counter;
714 else
715 window->success_ratio = IWL_INVALID_VALUE;
716
717 fail_count = window->counter - window->success_counter;
718
719 /* Calculate average throughput, if we have enough history. */
720 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
721 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
722 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
723 else
724 window->average_tpt = IWL_INVALID_VALUE;
725
726 return 0;
727 }
728
729 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
730 struct iwl_lq_sta *lq_sta,
731 struct iwl_scale_tbl_info *tbl,
732 int scale_index, int attempts, int successes,
733 u8 reduced_txp)
734 {
735 struct iwl_rate_scale_data *window = NULL;
736
737 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
738 return -EINVAL;
739
740 window = &tbl->tpc_win[reduced_txp];
741 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
742 window);
743 }
744
745 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
746 struct iwl_lq_sta *lq_sta,
747 struct iwl_scale_tbl_info *tbl,
748 int scale_index, int attempts, int successes)
749 {
750 struct iwl_rate_scale_data *window = NULL;
751
752 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
753 return -EINVAL;
754
755 if (tbl->column != RS_COLUMN_INVALID) {
756 struct lq_sta_pers *pers = &lq_sta->pers;
757
758 pers->tx_stats[tbl->column][scale_index].total += attempts;
759 pers->tx_stats[tbl->column][scale_index].success += successes;
760 }
761
762 /* Select window for current tx bit rate */
763 window = &(tbl->win[scale_index]);
764 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
765 window);
766 }
767
768 /* Convert rs_rate object into ucode rate bitmask */
769 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
770 struct rs_rate *rate)
771 {
772 u32 ucode_rate = 0;
773 int index = rate->index;
774
775 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
776 RATE_MCS_ANT_ABC_MSK);
777
778 if (is_legacy(rate)) {
779 ucode_rate |= iwl_rates[index].plcp;
780 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
781 ucode_rate |= RATE_MCS_CCK_MSK;
782 return ucode_rate;
783 }
784
785 if (is_ht(rate)) {
786 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
787 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
788 index = IWL_LAST_HT_RATE;
789 }
790 ucode_rate |= RATE_MCS_HT_MSK;
791
792 if (is_ht_siso(rate))
793 ucode_rate |= iwl_rates[index].plcp_ht_siso;
794 else if (is_ht_mimo2(rate))
795 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
796 else
797 WARN_ON_ONCE(1);
798 } else if (is_vht(rate)) {
799 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
800 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
801 index = IWL_LAST_VHT_RATE;
802 }
803 ucode_rate |= RATE_MCS_VHT_MSK;
804 if (is_vht_siso(rate))
805 ucode_rate |= iwl_rates[index].plcp_vht_siso;
806 else if (is_vht_mimo2(rate))
807 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
808 else
809 WARN_ON_ONCE(1);
810
811 } else {
812 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
813 }
814
815 if (is_siso(rate) && rate->stbc) {
816 /* To enable STBC we need to set both a flag and ANT_AB */
817 ucode_rate |= RATE_MCS_ANT_AB_MSK;
818 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
819 }
820
821 ucode_rate |= rate->bw;
822 if (rate->sgi)
823 ucode_rate |= RATE_MCS_SGI_MSK;
824 if (rate->ldpc)
825 ucode_rate |= RATE_MCS_LDPC_MSK;
826
827 return ucode_rate;
828 }
829
830 /* Convert a ucode rate into an rs_rate object */
831 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
832 enum ieee80211_band band,
833 struct rs_rate *rate)
834 {
835 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
836 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
837 u8 nss;
838
839 memset(rate, 0, sizeof(*rate));
840 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
841
842 if (rate->index == IWL_RATE_INVALID)
843 return -EINVAL;
844
845 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
846
847 /* Legacy */
848 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
849 !(ucode_rate & RATE_MCS_VHT_MSK)) {
850 if (num_of_ant == 1) {
851 if (band == IEEE80211_BAND_5GHZ)
852 rate->type = LQ_LEGACY_A;
853 else
854 rate->type = LQ_LEGACY_G;
855 }
856
857 return 0;
858 }
859
860 /* HT or VHT */
861 if (ucode_rate & RATE_MCS_SGI_MSK)
862 rate->sgi = true;
863 if (ucode_rate & RATE_MCS_LDPC_MSK)
864 rate->ldpc = true;
865 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
866 rate->stbc = true;
867 if (ucode_rate & RATE_MCS_BF_MSK)
868 rate->bfer = true;
869
870 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
871
872 if (ucode_rate & RATE_MCS_HT_MSK) {
873 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
874 RATE_HT_MCS_NSS_POS) + 1;
875
876 if (nss == 1) {
877 rate->type = LQ_HT_SISO;
878 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
879 "stbc %d bfer %d",
880 rate->stbc, rate->bfer);
881 } else if (nss == 2) {
882 rate->type = LQ_HT_MIMO2;
883 WARN_ON_ONCE(num_of_ant != 2);
884 } else {
885 WARN_ON_ONCE(1);
886 }
887 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
888 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
889 RATE_VHT_MCS_NSS_POS) + 1;
890
891 if (nss == 1) {
892 rate->type = LQ_VHT_SISO;
893 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
894 "stbc %d bfer %d",
895 rate->stbc, rate->bfer);
896 } else if (nss == 2) {
897 rate->type = LQ_VHT_MIMO2;
898 WARN_ON_ONCE(num_of_ant != 2);
899 } else {
900 WARN_ON_ONCE(1);
901 }
902 }
903
904 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
905 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
906 !is_vht(rate));
907
908 return 0;
909 }
910
911 /* switch to another antenna/antennas and return 1 */
912 /* if no other valid antenna found, return 0 */
913 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
914 {
915 u8 new_ant_type;
916
917 if (!rate->ant || rate->ant > ANT_ABC)
918 return 0;
919
920 if (!rs_is_valid_ant(valid_ant, rate->ant))
921 return 0;
922
923 new_ant_type = ant_toggle_lookup[rate->ant];
924
925 while ((new_ant_type != rate->ant) &&
926 !rs_is_valid_ant(valid_ant, new_ant_type))
927 new_ant_type = ant_toggle_lookup[new_ant_type];
928
929 if (new_ant_type == rate->ant)
930 return 0;
931
932 rate->ant = new_ant_type;
933
934 return 1;
935 }
936
937 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
938 struct rs_rate *rate)
939 {
940 if (is_legacy(rate))
941 return lq_sta->active_legacy_rate;
942 else if (is_siso(rate))
943 return lq_sta->active_siso_rate;
944 else if (is_mimo2(rate))
945 return lq_sta->active_mimo2_rate;
946
947 WARN_ON_ONCE(1);
948 return 0;
949 }
950
951 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
952 int rate_type)
953 {
954 u8 high = IWL_RATE_INVALID;
955 u8 low = IWL_RATE_INVALID;
956
957 /* 802.11A or ht walks to the next literal adjacent rate in
958 * the rate table */
959 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
960 int i;
961 u32 mask;
962
963 /* Find the previous rate that is in the rate mask */
964 i = index - 1;
965 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
966 if (rate_mask & mask) {
967 low = i;
968 break;
969 }
970 }
971
972 /* Find the next rate that is in the rate mask */
973 i = index + 1;
974 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
975 if (rate_mask & mask) {
976 high = i;
977 break;
978 }
979 }
980
981 return (high << 8) | low;
982 }
983
984 low = index;
985 while (low != IWL_RATE_INVALID) {
986 low = iwl_rates[low].prev_rs;
987 if (low == IWL_RATE_INVALID)
988 break;
989 if (rate_mask & (1 << low))
990 break;
991 }
992
993 high = index;
994 while (high != IWL_RATE_INVALID) {
995 high = iwl_rates[high].next_rs;
996 if (high == IWL_RATE_INVALID)
997 break;
998 if (rate_mask & (1 << high))
999 break;
1000 }
1001
1002 return (high << 8) | low;
1003 }
1004
1005 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1006 struct rs_rate *rate)
1007 {
1008 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1009 }
1010
1011 /* Get the next supported lower rate in the current column.
1012 * Return true if bottom rate in the current column was reached
1013 */
1014 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1015 struct rs_rate *rate)
1016 {
1017 u8 low;
1018 u16 high_low;
1019 u16 rate_mask;
1020 struct iwl_mvm *mvm = lq_sta->pers.drv;
1021
1022 rate_mask = rs_get_supported_rates(lq_sta, rate);
1023 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1024 rate->type);
1025 low = high_low & 0xff;
1026
1027 /* Bottom rate of column reached */
1028 if (low == IWL_RATE_INVALID)
1029 return true;
1030
1031 rate->index = low;
1032 return false;
1033 }
1034
1035 /* Get the next rate to use following a column downgrade */
1036 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1037 struct rs_rate *rate)
1038 {
1039 struct iwl_mvm *mvm = lq_sta->pers.drv;
1040
1041 if (is_legacy(rate)) {
1042 /* No column to downgrade from Legacy */
1043 return;
1044 } else if (is_siso(rate)) {
1045 /* Downgrade to Legacy if we were in SISO */
1046 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1047 rate->type = LQ_LEGACY_A;
1048 else
1049 rate->type = LQ_LEGACY_G;
1050
1051 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1052
1053 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1054 rate->index > IWL_RATE_MCS_9_INDEX);
1055
1056 rate->index = rs_ht_to_legacy[rate->index];
1057 rate->ldpc = false;
1058 } else {
1059 /* Downgrade to SISO with same MCS if in MIMO */
1060 rate->type = is_vht_mimo2(rate) ?
1061 LQ_VHT_SISO : LQ_HT_SISO;
1062 }
1063
1064 if (num_of_ant(rate->ant) > 1)
1065 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1066
1067 /* Relevant in both switching to SISO or Legacy */
1068 rate->sgi = false;
1069
1070 if (!rs_rate_supported(lq_sta, rate))
1071 rs_get_lower_rate_in_column(lq_sta, rate);
1072 }
1073
1074 /* Check if both rates are identical
1075 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1076 * with a rate indicating STBC/BFER and ANT_AB.
1077 */
1078 static inline bool rs_rate_equal(struct rs_rate *a,
1079 struct rs_rate *b,
1080 bool allow_ant_mismatch)
1081
1082 {
1083 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1084 (a->bfer == b->bfer);
1085
1086 if (allow_ant_mismatch) {
1087 if (a->stbc || a->bfer) {
1088 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1089 a->stbc, a->bfer, a->ant);
1090 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1091 } else if (b->stbc || b->bfer) {
1092 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1093 b->stbc, b->bfer, b->ant);
1094 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1095 }
1096 }
1097
1098 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1099 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1100 }
1101
1102 /* Check if both rates share the same column */
1103 static inline bool rs_rate_column_match(struct rs_rate *a,
1104 struct rs_rate *b)
1105 {
1106 bool ant_match;
1107
1108 if (a->stbc || a->bfer)
1109 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1110 else
1111 ant_match = (a->ant == b->ant);
1112
1113 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1114 && ant_match;
1115 }
1116
1117 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1118 {
1119 if (is_legacy(rate)) {
1120 if (rate->ant == ANT_A)
1121 return RS_COLUMN_LEGACY_ANT_A;
1122
1123 if (rate->ant == ANT_B)
1124 return RS_COLUMN_LEGACY_ANT_B;
1125
1126 goto err;
1127 }
1128
1129 if (is_siso(rate)) {
1130 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1131 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1132 RS_COLUMN_SISO_ANT_A;
1133
1134 if (rate->ant == ANT_B)
1135 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1136 RS_COLUMN_SISO_ANT_B;
1137
1138 goto err;
1139 }
1140
1141 if (is_mimo(rate))
1142 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1143
1144 err:
1145 return RS_COLUMN_INVALID;
1146 }
1147
1148 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1149 {
1150 u8 tid = IWL_MAX_TID_COUNT;
1151
1152 if (ieee80211_is_data_qos(hdr->frame_control)) {
1153 u8 *qc = ieee80211_get_qos_ctl(hdr);
1154 tid = qc[0] & 0xf;
1155 }
1156
1157 if (unlikely(tid > IWL_MAX_TID_COUNT))
1158 tid = IWL_MAX_TID_COUNT;
1159
1160 return tid;
1161 }
1162
1163 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1164 int tid, struct ieee80211_tx_info *info)
1165 {
1166 int legacy_success;
1167 int retries;
1168 int i;
1169 struct iwl_lq_cmd *table;
1170 u32 lq_hwrate;
1171 struct rs_rate lq_rate, tx_resp_rate;
1172 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1173 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1174 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1175 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1176 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1177 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1178 IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1179
1180 /* Treat uninitialized rate scaling data same as non-existing. */
1181 if (!lq_sta) {
1182 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1183 return;
1184 } else if (!lq_sta->pers.drv) {
1185 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1186 return;
1187 }
1188
1189 /* This packet was aggregated but doesn't carry status info */
1190 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1191 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1192 return;
1193
1194 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1195
1196 #ifdef CONFIG_MAC80211_DEBUGFS
1197 /* Disable last tx check if we are debugging with fixed rate but
1198 * update tx stats */
1199 if (lq_sta->pers.dbg_fixed_rate) {
1200 int index = tx_resp_rate.index;
1201 enum rs_column column;
1202 int attempts, success;
1203
1204 column = rs_get_column_from_rate(&tx_resp_rate);
1205 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1206 "Can't map rate 0x%x to column",
1207 tx_resp_hwrate))
1208 return;
1209
1210 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1211 attempts = info->status.ampdu_len;
1212 success = info->status.ampdu_ack_len;
1213 } else {
1214 attempts = info->status.rates[0].count;
1215 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1216 }
1217
1218 lq_sta->pers.tx_stats[column][index].total += attempts;
1219 lq_sta->pers.tx_stats[column][index].success += success;
1220
1221 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1222 tx_resp_hwrate, success, attempts);
1223 return;
1224 }
1225 #endif
1226
1227 if (time_after(jiffies,
1228 (unsigned long)(lq_sta->last_tx +
1229 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1230 int t;
1231
1232 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1233 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1234 ieee80211_stop_tx_ba_session(sta, t);
1235
1236 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1237 return;
1238 }
1239 lq_sta->last_tx = jiffies;
1240
1241 /* Ignore this Tx frame response if its initial rate doesn't match
1242 * that of latest Link Quality command. There may be stragglers
1243 * from a previous Link Quality command, but we're no longer interested
1244 * in those; they're either from the "active" mode while we're trying
1245 * to check "search" mode, or a prior "search" mode after we've moved
1246 * to a new "search" mode (which might become the new "active" mode).
1247 */
1248 table = &lq_sta->lq;
1249 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1250 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1251
1252 /* Here we actually compare this rate to the latest LQ command */
1253 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1254 IWL_DEBUG_RATE(mvm,
1255 "initial tx resp rate 0x%x does not match 0x%x\n",
1256 tx_resp_hwrate, lq_hwrate);
1257
1258 /*
1259 * Since rates mis-match, the last LQ command may have failed.
1260 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1261 * ... driver.
1262 */
1263 lq_sta->missed_rate_counter++;
1264 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1265 lq_sta->missed_rate_counter = 0;
1266 IWL_DEBUG_RATE(mvm,
1267 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1268 lq_sta->rs_state);
1269 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1270 }
1271 /* Regardless, ignore this status info for outdated rate */
1272 return;
1273 } else
1274 /* Rate did match, so reset the missed_rate_counter */
1275 lq_sta->missed_rate_counter = 0;
1276
1277 if (!lq_sta->search_better_tbl) {
1278 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1279 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1280 } else {
1281 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1282 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1283 }
1284
1285 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1286 IWL_DEBUG_RATE(mvm,
1287 "Neither active nor search matches tx rate\n");
1288 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1289 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1290 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1291 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1292 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1293
1294 /*
1295 * no matching table found, let's by-pass the data collection
1296 * and continue to perform rate scale to find the rate table
1297 */
1298 rs_stay_in_table(lq_sta, true);
1299 goto done;
1300 }
1301
1302 /*
1303 * Updating the frame history depends on whether packets were
1304 * aggregated.
1305 *
1306 * For aggregation, all packets were transmitted at the same rate, the
1307 * first index into rate scale table.
1308 */
1309 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1310 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1311 info->status.ampdu_len,
1312 info->status.ampdu_ack_len,
1313 reduced_txp);
1314
1315 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1316 * it as a single frame loss as we don't want the success ratio
1317 * to dip too quickly because a BA wasn't received.
1318 * For TPC, there's no need for this optimisation since we want
1319 * to recover very quickly from a bad power reduction and,
1320 * therefore we'd like the success ratio to get an immediate hit
1321 * when failing to get a BA, so we'd switch back to a lower or
1322 * zero power reduction. When FW transmits agg with a rate
1323 * different from the initial rate, it will not use reduced txp
1324 * and will send BA notification twice (one empty with reduced
1325 * txp equal to the value from LQ and one with reduced txp 0).
1326 * We need to update counters for each txp level accordingly.
1327 */
1328 if (info->status.ampdu_ack_len == 0)
1329 info->status.ampdu_len = 1;
1330
1331 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1332 info->status.ampdu_len,
1333 info->status.ampdu_ack_len);
1334
1335 /* Update success/fail counts if not searching for new mode */
1336 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1337 lq_sta->total_success += info->status.ampdu_ack_len;
1338 lq_sta->total_failed += (info->status.ampdu_len -
1339 info->status.ampdu_ack_len);
1340 }
1341 } else {
1342 /* For legacy, update frame history with for each Tx retry. */
1343 retries = info->status.rates[0].count - 1;
1344 /* HW doesn't send more than 15 retries */
1345 retries = min(retries, 15);
1346
1347 /* The last transmission may have been successful */
1348 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1349 /* Collect data for each rate used during failed TX attempts */
1350 for (i = 0; i <= retries; ++i) {
1351 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1352 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1353 &lq_rate);
1354 /*
1355 * Only collect stats if retried rate is in the same RS
1356 * table as active/search.
1357 */
1358 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1359 tmp_tbl = curr_tbl;
1360 else if (rs_rate_column_match(&lq_rate,
1361 &other_tbl->rate))
1362 tmp_tbl = other_tbl;
1363 else
1364 continue;
1365
1366 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1367 lq_rate.index, 1,
1368 i < retries ? 0 : legacy_success,
1369 reduced_txp);
1370 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1371 lq_rate.index, 1,
1372 i < retries ? 0 : legacy_success);
1373 }
1374
1375 /* Update success/fail counts if not searching for new mode */
1376 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1377 lq_sta->total_success += legacy_success;
1378 lq_sta->total_failed += retries + (1 - legacy_success);
1379 }
1380 }
1381 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1382 lq_sta->last_rate_n_flags = lq_hwrate;
1383 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1384 done:
1385 /* See if there's a better rate or modulation mode to try. */
1386 if (sta->supp_rates[info->band])
1387 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1388 }
1389
1390 /*
1391 * mac80211 sends us Tx status
1392 */
1393 static void rs_mac80211_tx_status(void *mvm_r,
1394 struct ieee80211_supported_band *sband,
1395 struct ieee80211_sta *sta, void *priv_sta,
1396 struct sk_buff *skb)
1397 {
1398 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1399 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1400 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1402
1403 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1404 return;
1405
1406 if (!ieee80211_is_data(hdr->frame_control) ||
1407 info->flags & IEEE80211_TX_CTL_NO_ACK)
1408 return;
1409
1410 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1411 }
1412
1413 /*
1414 * Begin a period of staying with a selected modulation mode.
1415 * Set "stay_in_tbl" flag to prevent any mode switches.
1416 * Set frame tx success limits according to legacy vs. high-throughput,
1417 * and reset overall (spanning all rates) tx success history statistics.
1418 * These control how long we stay using same modulation mode before
1419 * searching for a new mode.
1420 */
1421 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1422 struct iwl_lq_sta *lq_sta)
1423 {
1424 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1425 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1426 if (is_legacy) {
1427 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1428 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1429 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1430 } else {
1431 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1432 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1433 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1434 }
1435 lq_sta->table_count = 0;
1436 lq_sta->total_failed = 0;
1437 lq_sta->total_success = 0;
1438 lq_sta->flush_timer = jiffies;
1439 lq_sta->visited_columns = 0;
1440 }
1441
1442 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1443 {
1444 if (rate_mask)
1445 return find_last_bit(&rate_mask, BITS_PER_LONG);
1446 return IWL_RATE_INVALID;
1447 }
1448
1449 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1450 const struct rs_tx_column *column)
1451 {
1452 switch (column->mode) {
1453 case RS_LEGACY:
1454 return lq_sta->max_legacy_rate_idx;
1455 case RS_SISO:
1456 return lq_sta->max_siso_rate_idx;
1457 case RS_MIMO2:
1458 return lq_sta->max_mimo2_rate_idx;
1459 default:
1460 WARN_ON_ONCE(1);
1461 }
1462
1463 return lq_sta->max_legacy_rate_idx;
1464 }
1465
1466 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1467 const struct rs_tx_column *column,
1468 u32 bw)
1469 {
1470 /* Used to choose among HT tables */
1471 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1472
1473 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1474 column->mode != RS_SISO &&
1475 column->mode != RS_MIMO2))
1476 return expected_tpt_legacy;
1477
1478 /* Legacy rates have only one table */
1479 if (column->mode == RS_LEGACY)
1480 return expected_tpt_legacy;
1481
1482 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1483 /* Choose among many HT tables depending on number of streams
1484 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1485 * status */
1486 if (column->mode == RS_SISO) {
1487 switch (bw) {
1488 case RATE_MCS_CHAN_WIDTH_20:
1489 ht_tbl_pointer = expected_tpt_siso_20MHz;
1490 break;
1491 case RATE_MCS_CHAN_WIDTH_40:
1492 ht_tbl_pointer = expected_tpt_siso_40MHz;
1493 break;
1494 case RATE_MCS_CHAN_WIDTH_80:
1495 ht_tbl_pointer = expected_tpt_siso_80MHz;
1496 break;
1497 default:
1498 WARN_ON_ONCE(1);
1499 }
1500 } else if (column->mode == RS_MIMO2) {
1501 switch (bw) {
1502 case RATE_MCS_CHAN_WIDTH_20:
1503 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1504 break;
1505 case RATE_MCS_CHAN_WIDTH_40:
1506 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1507 break;
1508 case RATE_MCS_CHAN_WIDTH_80:
1509 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1510 break;
1511 default:
1512 WARN_ON_ONCE(1);
1513 }
1514 } else {
1515 WARN_ON_ONCE(1);
1516 }
1517
1518 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1519 return ht_tbl_pointer[0];
1520 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1521 return ht_tbl_pointer[1];
1522 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1523 return ht_tbl_pointer[2];
1524 else /* AGG+SGI */
1525 return ht_tbl_pointer[3];
1526 }
1527
1528 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1529 struct iwl_scale_tbl_info *tbl)
1530 {
1531 struct rs_rate *rate = &tbl->rate;
1532 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1533
1534 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1535 }
1536
1537 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1538 struct iwl_lq_sta *lq_sta,
1539 struct iwl_scale_tbl_info *tbl, /* "search" */
1540 unsigned long rate_mask, s8 index)
1541 {
1542 struct iwl_scale_tbl_info *active_tbl =
1543 &(lq_sta->lq_info[lq_sta->active_tbl]);
1544 s32 success_ratio = active_tbl->win[index].success_ratio;
1545 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1546 const u16 *tpt_tbl = tbl->expected_tpt;
1547 u16 high_low;
1548 u32 target_tpt;
1549 int rate_idx;
1550
1551 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1552 target_tpt = 100 * expected_current_tpt;
1553 IWL_DEBUG_RATE(mvm,
1554 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1555 success_ratio, target_tpt);
1556 } else {
1557 target_tpt = lq_sta->last_tpt;
1558 IWL_DEBUG_RATE(mvm,
1559 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1560 success_ratio, target_tpt);
1561 }
1562
1563 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1564
1565 while (rate_idx != IWL_RATE_INVALID) {
1566 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1567 break;
1568
1569 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1570 tbl->rate.type);
1571
1572 rate_idx = (high_low >> 8) & 0xff;
1573 }
1574
1575 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1576 rate_idx, target_tpt,
1577 rate_idx != IWL_RATE_INVALID ?
1578 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1579
1580 return rate_idx;
1581 }
1582
1583 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1584 {
1585 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1586 return RATE_MCS_CHAN_WIDTH_80;
1587 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1588 return RATE_MCS_CHAN_WIDTH_40;
1589
1590 return RATE_MCS_CHAN_WIDTH_20;
1591 }
1592
1593 /*
1594 * Check whether we should continue using same modulation mode, or
1595 * begin search for a new mode, based on:
1596 * 1) # tx successes or failures while using this mode
1597 * 2) # times calling this function
1598 * 3) elapsed time in this mode (not used, for now)
1599 */
1600 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1601 {
1602 struct iwl_scale_tbl_info *tbl;
1603 int active_tbl;
1604 int flush_interval_passed = 0;
1605 struct iwl_mvm *mvm;
1606
1607 mvm = lq_sta->pers.drv;
1608 active_tbl = lq_sta->active_tbl;
1609
1610 tbl = &(lq_sta->lq_info[active_tbl]);
1611
1612 /* If we've been disallowing search, see if we should now allow it */
1613 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1614 /* Elapsed time using current modulation mode */
1615 if (lq_sta->flush_timer)
1616 flush_interval_passed =
1617 time_after(jiffies,
1618 (unsigned long)(lq_sta->flush_timer +
1619 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1620
1621 /*
1622 * Check if we should allow search for new modulation mode.
1623 * If many frames have failed or succeeded, or we've used
1624 * this same modulation for a long time, allow search, and
1625 * reset history stats that keep track of whether we should
1626 * allow a new search. Also (below) reset all bitmaps and
1627 * stats in active history.
1628 */
1629 if (force_search ||
1630 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1631 (lq_sta->total_success > lq_sta->max_success_limit) ||
1632 ((!lq_sta->search_better_tbl) &&
1633 (lq_sta->flush_timer) && (flush_interval_passed))) {
1634 IWL_DEBUG_RATE(mvm,
1635 "LQ: stay is expired %d %d %d\n",
1636 lq_sta->total_failed,
1637 lq_sta->total_success,
1638 flush_interval_passed);
1639
1640 /* Allow search for new mode */
1641 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1642 IWL_DEBUG_RATE(mvm,
1643 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1644 lq_sta->total_failed = 0;
1645 lq_sta->total_success = 0;
1646 lq_sta->flush_timer = 0;
1647 /* mark the current column as visited */
1648 lq_sta->visited_columns = BIT(tbl->column);
1649 /*
1650 * Else if we've used this modulation mode enough repetitions
1651 * (regardless of elapsed time or success/failure), reset
1652 * history bitmaps and rate-specific stats for all rates in
1653 * active table.
1654 */
1655 } else {
1656 lq_sta->table_count++;
1657 if (lq_sta->table_count >=
1658 lq_sta->table_count_limit) {
1659 lq_sta->table_count = 0;
1660
1661 IWL_DEBUG_RATE(mvm,
1662 "LQ: stay in table clear win\n");
1663 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1664 }
1665 }
1666
1667 /* If transitioning to allow "search", reset all history
1668 * bitmaps and stats in active table (this will become the new
1669 * "search" table). */
1670 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1671 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1672 }
1673 }
1674 }
1675
1676 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1677 struct iwl_scale_tbl_info *tbl,
1678 enum rs_action scale_action)
1679 {
1680 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1681
1682 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1683 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1684 scale_action == RS_ACTION_DOWNSCALE)
1685 sta_priv->tlc_amsdu = false;
1686 else
1687 sta_priv->tlc_amsdu = true;
1688 }
1689
1690 /*
1691 * setup rate table in uCode
1692 */
1693 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1694 struct ieee80211_sta *sta,
1695 struct iwl_lq_sta *lq_sta,
1696 struct iwl_scale_tbl_info *tbl)
1697 {
1698 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1699 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1700 }
1701
1702 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1703 struct ieee80211_sta *sta,
1704 struct iwl_lq_sta *lq_sta,
1705 struct iwl_scale_tbl_info *tbl,
1706 enum rs_action scale_action)
1707 {
1708 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1709 return false;
1710
1711 if (!is_vht_siso(&tbl->rate))
1712 return false;
1713
1714 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1715 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1716 (scale_action == RS_ACTION_DOWNSCALE)) {
1717 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1718 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1719 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1720 goto tweaked;
1721 }
1722
1723 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1724 * sustainable, i.e. we're past the test window. We can't go back
1725 * if MCS5 is just tested as this will happen always after switching
1726 * to 20Mhz MCS4 because the rate stats are cleared.
1727 */
1728 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1729 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1730 (scale_action == RS_ACTION_STAY)) ||
1731 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1732 (scale_action == RS_ACTION_UPSCALE)))) {
1733 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1734 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1735 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1736 goto tweaked;
1737 }
1738
1739 return false;
1740
1741 tweaked:
1742 rs_set_expected_tpt_table(lq_sta, tbl);
1743 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1744 return true;
1745 }
1746
1747 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1748 struct iwl_lq_sta *lq_sta,
1749 struct ieee80211_sta *sta,
1750 struct iwl_scale_tbl_info *tbl)
1751 {
1752 int i, j, max_rate;
1753 enum rs_column next_col_id;
1754 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1755 const struct rs_tx_column *next_col;
1756 allow_column_func_t allow_func;
1757 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1758 const u16 *expected_tpt_tbl;
1759 u16 tpt, max_expected_tpt;
1760
1761 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1762 next_col_id = curr_col->next_columns[i];
1763
1764 if (next_col_id == RS_COLUMN_INVALID)
1765 continue;
1766
1767 if (lq_sta->visited_columns & BIT(next_col_id)) {
1768 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1769 next_col_id);
1770 continue;
1771 }
1772
1773 next_col = &rs_tx_columns[next_col_id];
1774
1775 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1776 IWL_DEBUG_RATE(mvm,
1777 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1778 next_col_id, valid_ants, next_col->ant);
1779 continue;
1780 }
1781
1782 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1783 allow_func = next_col->checks[j];
1784 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1785 next_col))
1786 break;
1787 }
1788
1789 if (j != MAX_COLUMN_CHECKS) {
1790 IWL_DEBUG_RATE(mvm,
1791 "Skip column %d: not allowed (check %d failed)\n",
1792 next_col_id, j);
1793
1794 continue;
1795 }
1796
1797 tpt = lq_sta->last_tpt / 100;
1798 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1799 rs_bw_from_sta_bw(sta));
1800 if (WARN_ON_ONCE(!expected_tpt_tbl))
1801 continue;
1802
1803 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1804 if (max_rate == IWL_RATE_INVALID) {
1805 IWL_DEBUG_RATE(mvm,
1806 "Skip column %d: no rate is allowed in this column\n",
1807 next_col_id);
1808 continue;
1809 }
1810
1811 max_expected_tpt = expected_tpt_tbl[max_rate];
1812 if (tpt >= max_expected_tpt) {
1813 IWL_DEBUG_RATE(mvm,
1814 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1815 next_col_id, max_expected_tpt, tpt);
1816 continue;
1817 }
1818
1819 IWL_DEBUG_RATE(mvm,
1820 "Found potential column %d. Max expected %d current %d\n",
1821 next_col_id, max_expected_tpt, tpt);
1822 break;
1823 }
1824
1825 if (i == MAX_NEXT_COLUMNS)
1826 return RS_COLUMN_INVALID;
1827
1828 return next_col_id;
1829 }
1830
1831 static int rs_switch_to_column(struct iwl_mvm *mvm,
1832 struct iwl_lq_sta *lq_sta,
1833 struct ieee80211_sta *sta,
1834 enum rs_column col_id)
1835 {
1836 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1837 struct iwl_scale_tbl_info *search_tbl =
1838 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1839 struct rs_rate *rate = &search_tbl->rate;
1840 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1841 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1842 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1843 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1844 unsigned long rate_mask = 0;
1845 u32 rate_idx = 0;
1846
1847 memcpy(search_tbl, tbl, sz);
1848
1849 rate->sgi = column->sgi;
1850 rate->ant = column->ant;
1851
1852 if (column->mode == RS_LEGACY) {
1853 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1854 rate->type = LQ_LEGACY_A;
1855 else
1856 rate->type = LQ_LEGACY_G;
1857
1858 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1859 rate->ldpc = false;
1860 rate_mask = lq_sta->active_legacy_rate;
1861 } else if (column->mode == RS_SISO) {
1862 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1863 rate_mask = lq_sta->active_siso_rate;
1864 } else if (column->mode == RS_MIMO2) {
1865 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1866 rate_mask = lq_sta->active_mimo2_rate;
1867 } else {
1868 WARN_ONCE(1, "Bad column mode");
1869 }
1870
1871 if (column->mode != RS_LEGACY) {
1872 rate->bw = rs_bw_from_sta_bw(sta);
1873 rate->ldpc = lq_sta->ldpc;
1874 }
1875
1876 search_tbl->column = col_id;
1877 rs_set_expected_tpt_table(lq_sta, search_tbl);
1878
1879 lq_sta->visited_columns |= BIT(col_id);
1880
1881 /* Get the best matching rate if we're changing modes. e.g.
1882 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1883 */
1884 if (curr_column->mode != column->mode) {
1885 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1886 rate_mask, rate->index);
1887
1888 if ((rate_idx == IWL_RATE_INVALID) ||
1889 !(BIT(rate_idx) & rate_mask)) {
1890 IWL_DEBUG_RATE(mvm,
1891 "can not switch with index %d"
1892 " rate mask %lx\n",
1893 rate_idx, rate_mask);
1894
1895 goto err;
1896 }
1897
1898 rate->index = rate_idx;
1899 }
1900
1901 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1902 col_id, rate->index);
1903
1904 return 0;
1905
1906 err:
1907 rate->type = LQ_NONE;
1908 return -1;
1909 }
1910
1911 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1912 struct iwl_scale_tbl_info *tbl,
1913 s32 sr, int low, int high,
1914 int current_tpt,
1915 int low_tpt, int high_tpt)
1916 {
1917 enum rs_action action = RS_ACTION_STAY;
1918
1919 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1920 (current_tpt == 0)) {
1921 IWL_DEBUG_RATE(mvm,
1922 "Decrease rate because of low SR\n");
1923 return RS_ACTION_DOWNSCALE;
1924 }
1925
1926 if ((low_tpt == IWL_INVALID_VALUE) &&
1927 (high_tpt == IWL_INVALID_VALUE) &&
1928 (high != IWL_RATE_INVALID)) {
1929 IWL_DEBUG_RATE(mvm,
1930 "No data about high/low rates. Increase rate\n");
1931 return RS_ACTION_UPSCALE;
1932 }
1933
1934 if ((high_tpt == IWL_INVALID_VALUE) &&
1935 (high != IWL_RATE_INVALID) &&
1936 (low_tpt != IWL_INVALID_VALUE) &&
1937 (low_tpt < current_tpt)) {
1938 IWL_DEBUG_RATE(mvm,
1939 "No data about high rate and low rate is worse. Increase rate\n");
1940 return RS_ACTION_UPSCALE;
1941 }
1942
1943 if ((high_tpt != IWL_INVALID_VALUE) &&
1944 (high_tpt > current_tpt)) {
1945 IWL_DEBUG_RATE(mvm,
1946 "Higher rate is better. Increate rate\n");
1947 return RS_ACTION_UPSCALE;
1948 }
1949
1950 if ((low_tpt != IWL_INVALID_VALUE) &&
1951 (high_tpt != IWL_INVALID_VALUE) &&
1952 (low_tpt < current_tpt) &&
1953 (high_tpt < current_tpt)) {
1954 IWL_DEBUG_RATE(mvm,
1955 "Both high and low are worse. Maintain rate\n");
1956 return RS_ACTION_STAY;
1957 }
1958
1959 if ((low_tpt != IWL_INVALID_VALUE) &&
1960 (low_tpt > current_tpt)) {
1961 IWL_DEBUG_RATE(mvm,
1962 "Lower rate is better\n");
1963 action = RS_ACTION_DOWNSCALE;
1964 goto out;
1965 }
1966
1967 if ((low_tpt == IWL_INVALID_VALUE) &&
1968 (low != IWL_RATE_INVALID)) {
1969 IWL_DEBUG_RATE(mvm,
1970 "No data about lower rate\n");
1971 action = RS_ACTION_DOWNSCALE;
1972 goto out;
1973 }
1974
1975 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1976
1977 out:
1978 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1979 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1980 IWL_DEBUG_RATE(mvm,
1981 "SR is above NO DECREASE. Avoid downscale\n");
1982 action = RS_ACTION_STAY;
1983 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1984 IWL_DEBUG_RATE(mvm,
1985 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1986 action = RS_ACTION_STAY;
1987 } else {
1988 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1989 }
1990 }
1991
1992 return action;
1993 }
1994
1995 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1996 struct iwl_lq_sta *lq_sta)
1997 {
1998 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1999 * supports STBC of at least 1*SS
2000 */
2001 if (!lq_sta->stbc_capable)
2002 return false;
2003
2004 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2005 return false;
2006
2007 return true;
2008 }
2009
2010 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2011 int *weaker, int *stronger)
2012 {
2013 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2014 if (*weaker > TPC_MAX_REDUCTION)
2015 *weaker = TPC_INVALID;
2016
2017 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2018 if (*stronger < 0)
2019 *stronger = TPC_INVALID;
2020 }
2021
2022 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2023 struct rs_rate *rate, enum ieee80211_band band)
2024 {
2025 int index = rate->index;
2026 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2027 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2028 !vif->bss_conf.ps);
2029
2030 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2031 cam, sta_ps_disabled);
2032 /*
2033 * allow tpc only if power management is enabled, or bt coex
2034 * activity grade allows it and we are on 2.4Ghz.
2035 */
2036 if ((cam || sta_ps_disabled) &&
2037 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2038 return false;
2039
2040 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2041 if (is_legacy(rate))
2042 return index == IWL_RATE_54M_INDEX;
2043 if (is_ht(rate))
2044 return index == IWL_RATE_MCS_7_INDEX;
2045 if (is_vht(rate))
2046 return index == IWL_RATE_MCS_7_INDEX ||
2047 index == IWL_RATE_MCS_8_INDEX ||
2048 index == IWL_RATE_MCS_9_INDEX;
2049
2050 WARN_ON_ONCE(1);
2051 return false;
2052 }
2053
2054 enum tpc_action {
2055 TPC_ACTION_STAY,
2056 TPC_ACTION_DECREASE,
2057 TPC_ACTION_INCREASE,
2058 TPC_ACTION_NO_RESTIRCTION,
2059 };
2060
2061 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2062 s32 sr, int weak, int strong,
2063 int current_tpt,
2064 int weak_tpt, int strong_tpt)
2065 {
2066 /* stay until we have valid tpt */
2067 if (current_tpt == IWL_INVALID_VALUE) {
2068 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2069 return TPC_ACTION_STAY;
2070 }
2071
2072 /* Too many failures, increase txp */
2073 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2074 current_tpt == 0) {
2075 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2076 return TPC_ACTION_NO_RESTIRCTION;
2077 }
2078
2079 /* try decreasing first if applicable */
2080 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2081 weak != TPC_INVALID) {
2082 if (weak_tpt == IWL_INVALID_VALUE &&
2083 (strong_tpt == IWL_INVALID_VALUE ||
2084 current_tpt >= strong_tpt)) {
2085 IWL_DEBUG_RATE(mvm,
2086 "no weak txp measurement. decrease txp\n");
2087 return TPC_ACTION_DECREASE;
2088 }
2089
2090 if (weak_tpt > current_tpt) {
2091 IWL_DEBUG_RATE(mvm,
2092 "lower txp has better tpt. decrease txp\n");
2093 return TPC_ACTION_DECREASE;
2094 }
2095 }
2096
2097 /* next, increase if needed */
2098 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2099 strong != TPC_INVALID) {
2100 if (weak_tpt == IWL_INVALID_VALUE &&
2101 strong_tpt != IWL_INVALID_VALUE &&
2102 current_tpt < strong_tpt) {
2103 IWL_DEBUG_RATE(mvm,
2104 "higher txp has better tpt. increase txp\n");
2105 return TPC_ACTION_INCREASE;
2106 }
2107
2108 if (weak_tpt < current_tpt &&
2109 (strong_tpt == IWL_INVALID_VALUE ||
2110 strong_tpt > current_tpt)) {
2111 IWL_DEBUG_RATE(mvm,
2112 "lower txp has worse tpt. increase txp\n");
2113 return TPC_ACTION_INCREASE;
2114 }
2115 }
2116
2117 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2118 return TPC_ACTION_STAY;
2119 }
2120
2121 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2122 struct ieee80211_sta *sta,
2123 struct iwl_lq_sta *lq_sta,
2124 struct iwl_scale_tbl_info *tbl)
2125 {
2126 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2127 struct ieee80211_vif *vif = mvm_sta->vif;
2128 struct ieee80211_chanctx_conf *chanctx_conf;
2129 enum ieee80211_band band;
2130 struct iwl_rate_scale_data *window;
2131 struct rs_rate *rate = &tbl->rate;
2132 enum tpc_action action;
2133 s32 sr;
2134 u8 cur = lq_sta->lq.reduced_tpc;
2135 int current_tpt;
2136 int weak, strong;
2137 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2138
2139 #ifdef CONFIG_MAC80211_DEBUGFS
2140 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2141 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2142 lq_sta->pers.dbg_fixed_txp_reduction);
2143 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2144 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2145 }
2146 #endif
2147
2148 rcu_read_lock();
2149 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2150 if (WARN_ON(!chanctx_conf))
2151 band = IEEE80211_NUM_BANDS;
2152 else
2153 band = chanctx_conf->def.chan->band;
2154 rcu_read_unlock();
2155
2156 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2157 IWL_DEBUG_RATE(mvm,
2158 "tpc is not allowed. remove txp restrictions\n");
2159 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2160 return cur != TPC_NO_REDUCTION;
2161 }
2162
2163 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2164
2165 /* Collect measured throughputs for current and adjacent rates */
2166 window = tbl->tpc_win;
2167 sr = window[cur].success_ratio;
2168 current_tpt = window[cur].average_tpt;
2169 if (weak != TPC_INVALID)
2170 weak_tpt = window[weak].average_tpt;
2171 if (strong != TPC_INVALID)
2172 strong_tpt = window[strong].average_tpt;
2173
2174 IWL_DEBUG_RATE(mvm,
2175 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2176 cur, current_tpt, sr, weak, strong,
2177 weak_tpt, strong_tpt);
2178
2179 action = rs_get_tpc_action(mvm, sr, weak, strong,
2180 current_tpt, weak_tpt, strong_tpt);
2181
2182 /* override actions if we are on the edge */
2183 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2184 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2185 action = TPC_ACTION_STAY;
2186 } else if (strong == TPC_INVALID &&
2187 (action == TPC_ACTION_INCREASE ||
2188 action == TPC_ACTION_NO_RESTIRCTION)) {
2189 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2190 action = TPC_ACTION_STAY;
2191 }
2192
2193 switch (action) {
2194 case TPC_ACTION_DECREASE:
2195 lq_sta->lq.reduced_tpc = weak;
2196 return true;
2197 case TPC_ACTION_INCREASE:
2198 lq_sta->lq.reduced_tpc = strong;
2199 return true;
2200 case TPC_ACTION_NO_RESTIRCTION:
2201 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2202 return true;
2203 case TPC_ACTION_STAY:
2204 /* do nothing */
2205 break;
2206 }
2207 return false;
2208 }
2209
2210 /*
2211 * Do rate scaling and search for new modulation mode.
2212 */
2213 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2214 struct ieee80211_sta *sta,
2215 struct iwl_lq_sta *lq_sta,
2216 int tid)
2217 {
2218 int low = IWL_RATE_INVALID;
2219 int high = IWL_RATE_INVALID;
2220 int index;
2221 struct iwl_rate_scale_data *window = NULL;
2222 int current_tpt = IWL_INVALID_VALUE;
2223 int low_tpt = IWL_INVALID_VALUE;
2224 int high_tpt = IWL_INVALID_VALUE;
2225 u32 fail_count;
2226 enum rs_action scale_action = RS_ACTION_STAY;
2227 u16 rate_mask;
2228 u8 update_lq = 0;
2229 struct iwl_scale_tbl_info *tbl, *tbl1;
2230 u8 active_tbl = 0;
2231 u8 done_search = 0;
2232 u16 high_low;
2233 s32 sr;
2234 u8 prev_agg = lq_sta->is_agg;
2235 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2236 struct iwl_mvm_tid_data *tid_data;
2237 struct rs_rate *rate;
2238
2239 lq_sta->is_agg = !!sta_priv->agg_tids;
2240
2241 /*
2242 * Select rate-scale / modulation-mode table to work with in
2243 * the rest of this function: "search" if searching for better
2244 * modulation mode, or "active" if doing rate scaling within a mode.
2245 */
2246 if (!lq_sta->search_better_tbl)
2247 active_tbl = lq_sta->active_tbl;
2248 else
2249 active_tbl = 1 - lq_sta->active_tbl;
2250
2251 tbl = &(lq_sta->lq_info[active_tbl]);
2252 rate = &tbl->rate;
2253
2254 if (prev_agg != lq_sta->is_agg) {
2255 IWL_DEBUG_RATE(mvm,
2256 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2257 prev_agg, lq_sta->is_agg);
2258 rs_set_expected_tpt_table(lq_sta, tbl);
2259 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2260 }
2261
2262 /* current tx rate */
2263 index = rate->index;
2264
2265 /* rates available for this association, and for modulation mode */
2266 rate_mask = rs_get_supported_rates(lq_sta, rate);
2267
2268 if (!(BIT(index) & rate_mask)) {
2269 IWL_ERR(mvm, "Current Rate is not valid\n");
2270 if (lq_sta->search_better_tbl) {
2271 /* revert to active table if search table is not valid*/
2272 rate->type = LQ_NONE;
2273 lq_sta->search_better_tbl = 0;
2274 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2275 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2276 }
2277 return;
2278 }
2279
2280 /* Get expected throughput table and history window for current rate */
2281 if (!tbl->expected_tpt) {
2282 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2283 return;
2284 }
2285
2286 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2287 window = &(tbl->win[index]);
2288
2289 /*
2290 * If there is not enough history to calculate actual average
2291 * throughput, keep analyzing results of more tx frames, without
2292 * changing rate or mode (bypass most of the rest of this function).
2293 * Set up new rate table in uCode only if old rate is not supported
2294 * in current association (use new rate found above).
2295 */
2296 fail_count = window->counter - window->success_counter;
2297 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2298 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2299 IWL_DEBUG_RATE(mvm,
2300 "%s: Test Window: succ %d total %d\n",
2301 rs_pretty_rate(rate),
2302 window->success_counter, window->counter);
2303
2304 /* Can't calculate this yet; not enough history */
2305 window->average_tpt = IWL_INVALID_VALUE;
2306
2307 /* Should we stay with this modulation mode,
2308 * or search for a new one? */
2309 rs_stay_in_table(lq_sta, false);
2310
2311 return;
2312 }
2313
2314 /* If we are searching for better modulation mode, check success. */
2315 if (lq_sta->search_better_tbl) {
2316 /* If good success, continue using the "search" mode;
2317 * no need to send new link quality command, since we're
2318 * continuing to use the setup that we've been trying. */
2319 if (window->average_tpt > lq_sta->last_tpt) {
2320 IWL_DEBUG_RATE(mvm,
2321 "SWITCHING TO NEW TABLE SR: %d "
2322 "cur-tpt %d old-tpt %d\n",
2323 window->success_ratio,
2324 window->average_tpt,
2325 lq_sta->last_tpt);
2326
2327 /* Swap tables; "search" becomes "active" */
2328 lq_sta->active_tbl = active_tbl;
2329 current_tpt = window->average_tpt;
2330 /* Else poor success; go back to mode in "active" table */
2331 } else {
2332 IWL_DEBUG_RATE(mvm,
2333 "GOING BACK TO THE OLD TABLE: SR %d "
2334 "cur-tpt %d old-tpt %d\n",
2335 window->success_ratio,
2336 window->average_tpt,
2337 lq_sta->last_tpt);
2338
2339 /* Nullify "search" table */
2340 rate->type = LQ_NONE;
2341
2342 /* Revert to "active" table */
2343 active_tbl = lq_sta->active_tbl;
2344 tbl = &(lq_sta->lq_info[active_tbl]);
2345
2346 /* Revert to "active" rate and throughput info */
2347 index = tbl->rate.index;
2348 current_tpt = lq_sta->last_tpt;
2349
2350 /* Need to set up a new rate table in uCode */
2351 update_lq = 1;
2352 }
2353
2354 /* Either way, we've made a decision; modulation mode
2355 * search is done, allow rate adjustment next time. */
2356 lq_sta->search_better_tbl = 0;
2357 done_search = 1; /* Don't switch modes below! */
2358 goto lq_update;
2359 }
2360
2361 /* (Else) not in search of better modulation mode, try for better
2362 * starting rate, while staying in this mode. */
2363 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2364 low = high_low & 0xff;
2365 high = (high_low >> 8) & 0xff;
2366
2367 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2368
2369 sr = window->success_ratio;
2370
2371 /* Collect measured throughputs for current and adjacent rates */
2372 current_tpt = window->average_tpt;
2373 if (low != IWL_RATE_INVALID)
2374 low_tpt = tbl->win[low].average_tpt;
2375 if (high != IWL_RATE_INVALID)
2376 high_tpt = tbl->win[high].average_tpt;
2377
2378 IWL_DEBUG_RATE(mvm,
2379 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2380 rs_pretty_rate(rate), current_tpt, sr,
2381 low, high, low_tpt, high_tpt);
2382
2383 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2384 current_tpt, low_tpt, high_tpt);
2385
2386 /* Force a search in case BT doesn't like us being in MIMO */
2387 if (is_mimo(rate) &&
2388 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2389 IWL_DEBUG_RATE(mvm,
2390 "BT Coex forbids MIMO. Search for new config\n");
2391 rs_stay_in_table(lq_sta, true);
2392 goto lq_update;
2393 }
2394
2395 switch (scale_action) {
2396 case RS_ACTION_DOWNSCALE:
2397 /* Decrease starting rate, update uCode's rate table */
2398 if (low != IWL_RATE_INVALID) {
2399 update_lq = 1;
2400 index = low;
2401 } else {
2402 IWL_DEBUG_RATE(mvm,
2403 "At the bottom rate. Can't decrease\n");
2404 }
2405
2406 break;
2407 case RS_ACTION_UPSCALE:
2408 /* Increase starting rate, update uCode's rate table */
2409 if (high != IWL_RATE_INVALID) {
2410 update_lq = 1;
2411 index = high;
2412 } else {
2413 IWL_DEBUG_RATE(mvm,
2414 "At the top rate. Can't increase\n");
2415 }
2416
2417 break;
2418 case RS_ACTION_STAY:
2419 /* No change */
2420 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2421 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2422 break;
2423 default:
2424 break;
2425 }
2426
2427 lq_update:
2428 /* Replace uCode's rate table for the destination station. */
2429 if (update_lq) {
2430 tbl->rate.index = index;
2431 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2432 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2433 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2434 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2435 }
2436
2437 rs_stay_in_table(lq_sta, false);
2438
2439 /*
2440 * Search for new modulation mode if we're:
2441 * 1) Not changing rates right now
2442 * 2) Not just finishing up a search
2443 * 3) Allowing a new search
2444 */
2445 if (!update_lq && !done_search &&
2446 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2447 && window->counter) {
2448 enum rs_column next_column;
2449
2450 /* Save current throughput to compare with "search" throughput*/
2451 lq_sta->last_tpt = current_tpt;
2452
2453 IWL_DEBUG_RATE(mvm,
2454 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2455 update_lq, done_search, lq_sta->rs_state,
2456 window->counter);
2457
2458 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2459 if (next_column != RS_COLUMN_INVALID) {
2460 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2461 next_column);
2462 if (!ret)
2463 lq_sta->search_better_tbl = 1;
2464 } else {
2465 IWL_DEBUG_RATE(mvm,
2466 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2467 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2468 }
2469
2470 /* If new "search" mode was selected, set up in uCode table */
2471 if (lq_sta->search_better_tbl) {
2472 /* Access the "search" table, clear its history. */
2473 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2474 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2475
2476 /* Use new "search" start rate */
2477 index = tbl->rate.index;
2478
2479 rs_dump_rate(mvm, &tbl->rate,
2480 "Switch to SEARCH TABLE:");
2481 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2482 } else {
2483 done_search = 1;
2484 }
2485 }
2486
2487 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2488 /* If the "active" (non-search) mode was legacy,
2489 * and we've tried switching antennas,
2490 * but we haven't been able to try HT modes (not available),
2491 * stay with best antenna legacy modulation for a while
2492 * before next round of mode comparisons. */
2493 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2494 if (is_legacy(&tbl1->rate)) {
2495 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2496
2497 if (tid != IWL_MAX_TID_COUNT) {
2498 tid_data = &sta_priv->tid_data[tid];
2499 if (tid_data->state != IWL_AGG_OFF) {
2500 IWL_DEBUG_RATE(mvm,
2501 "Stop aggregation on tid %d\n",
2502 tid);
2503 ieee80211_stop_tx_ba_session(sta, tid);
2504 }
2505 }
2506 rs_set_stay_in_table(mvm, 1, lq_sta);
2507 } else {
2508 /* If we're in an HT mode, and all 3 mode switch actions
2509 * have been tried and compared, stay in this best modulation
2510 * mode for a while before next round of mode comparisons. */
2511 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2512 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2513 (tid != IWL_MAX_TID_COUNT)) {
2514 tid_data = &sta_priv->tid_data[tid];
2515 if (tid_data->state == IWL_AGG_OFF) {
2516 IWL_DEBUG_RATE(mvm,
2517 "try to aggregate tid %d\n",
2518 tid);
2519 rs_tl_turn_on_agg(mvm, tid,
2520 lq_sta, sta);
2521 }
2522 }
2523 rs_set_stay_in_table(mvm, 0, lq_sta);
2524 }
2525 }
2526 }
2527
2528 struct rs_init_rate_info {
2529 s8 rssi;
2530 u8 rate_idx;
2531 };
2532
2533 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2534 { -60, IWL_RATE_54M_INDEX },
2535 { -64, IWL_RATE_48M_INDEX },
2536 { -68, IWL_RATE_36M_INDEX },
2537 { -80, IWL_RATE_24M_INDEX },
2538 { -84, IWL_RATE_18M_INDEX },
2539 { -85, IWL_RATE_12M_INDEX },
2540 { -86, IWL_RATE_11M_INDEX },
2541 { -88, IWL_RATE_5M_INDEX },
2542 { -90, IWL_RATE_2M_INDEX },
2543 { S8_MIN, IWL_RATE_1M_INDEX },
2544 };
2545
2546 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2547 { -60, IWL_RATE_54M_INDEX },
2548 { -64, IWL_RATE_48M_INDEX },
2549 { -72, IWL_RATE_36M_INDEX },
2550 { -80, IWL_RATE_24M_INDEX },
2551 { -84, IWL_RATE_18M_INDEX },
2552 { -85, IWL_RATE_12M_INDEX },
2553 { -87, IWL_RATE_9M_INDEX },
2554 { S8_MIN, IWL_RATE_6M_INDEX },
2555 };
2556
2557 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2558 { -60, IWL_RATE_MCS_7_INDEX },
2559 { -64, IWL_RATE_MCS_6_INDEX },
2560 { -68, IWL_RATE_MCS_5_INDEX },
2561 { -72, IWL_RATE_MCS_4_INDEX },
2562 { -80, IWL_RATE_MCS_3_INDEX },
2563 { -84, IWL_RATE_MCS_2_INDEX },
2564 { -85, IWL_RATE_MCS_1_INDEX },
2565 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2566 };
2567
2568 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2569 { -60, IWL_RATE_MCS_8_INDEX },
2570 { -64, IWL_RATE_MCS_7_INDEX },
2571 { -68, IWL_RATE_MCS_6_INDEX },
2572 { -72, IWL_RATE_MCS_5_INDEX },
2573 { -80, IWL_RATE_MCS_4_INDEX },
2574 { -84, IWL_RATE_MCS_3_INDEX },
2575 { -85, IWL_RATE_MCS_2_INDEX },
2576 { -87, IWL_RATE_MCS_1_INDEX },
2577 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2578 };
2579
2580 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = {
2581 { -60, IWL_RATE_MCS_9_INDEX },
2582 { -64, IWL_RATE_MCS_8_INDEX },
2583 { -68, IWL_RATE_MCS_7_INDEX },
2584 { -72, IWL_RATE_MCS_6_INDEX },
2585 { -80, IWL_RATE_MCS_5_INDEX },
2586 { -84, IWL_RATE_MCS_4_INDEX },
2587 { -85, IWL_RATE_MCS_3_INDEX },
2588 { -87, IWL_RATE_MCS_2_INDEX },
2589 { -88, IWL_RATE_MCS_1_INDEX },
2590 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2591 };
2592
2593 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2594
2595 /* Init the optimal rate based on STA caps
2596 * This combined with rssi is used to report the last tx rate
2597 * to userspace when we haven't transmitted enough frames.
2598 */
2599 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2600 struct ieee80211_sta *sta,
2601 struct iwl_lq_sta *lq_sta)
2602 {
2603 struct rs_rate *rate = &lq_sta->optimal_rate;
2604
2605 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2606 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2607 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2608 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2609 else if (lq_sta->band == IEEE80211_BAND_5GHZ)
2610 rate->type = LQ_LEGACY_A;
2611 else
2612 rate->type = LQ_LEGACY_G;
2613
2614 rate->bw = rs_bw_from_sta_bw(sta);
2615 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2616
2617 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2618
2619 if (is_mimo(rate)) {
2620 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2621 } else if (is_siso(rate)) {
2622 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2623 } else {
2624 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2625
2626 if (lq_sta->band == IEEE80211_BAND_5GHZ) {
2627 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2628 lq_sta->optimal_nentries =
2629 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2630 } else {
2631 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2632 lq_sta->optimal_nentries =
2633 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2634 }
2635 }
2636
2637 if (is_vht(rate)) {
2638 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2639 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2640 lq_sta->optimal_nentries =
2641 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2642 } else {
2643 lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz;
2644 lq_sta->optimal_nentries =
2645 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2646 }
2647 } else if (is_ht(rate)) {
2648 lq_sta->optimal_rates = rs_optimal_rates_ht;
2649 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2650 }
2651 }
2652
2653 /* Compute the optimal rate index based on RSSI */
2654 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2655 struct iwl_lq_sta *lq_sta)
2656 {
2657 struct rs_rate *rate = &lq_sta->optimal_rate;
2658 int i;
2659
2660 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2661 BITS_PER_LONG);
2662
2663 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2664 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2665
2666 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2667 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2668 rate->index = rate_idx;
2669 break;
2670 }
2671 }
2672
2673 return rate;
2674 }
2675
2676 /* Choose an initial legacy rate and antenna to use based on the RSSI
2677 * of last Rx
2678 */
2679 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2680 struct ieee80211_sta *sta,
2681 struct iwl_lq_sta *lq_sta,
2682 enum ieee80211_band band,
2683 struct rs_rate *rate)
2684 {
2685 int i, nentries;
2686 unsigned long active_rate;
2687 s8 best_rssi = S8_MIN;
2688 u8 best_ant = ANT_NONE;
2689 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2690 const struct rs_init_rate_info *initial_rates;
2691
2692 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2693 if (!(lq_sta->pers.chains & BIT(i)))
2694 continue;
2695
2696 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2697 best_rssi = lq_sta->pers.chain_signal[i];
2698 best_ant = BIT(i);
2699 }
2700 }
2701
2702 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2703 rs_pretty_ant(best_ant), best_rssi);
2704
2705 if (best_ant != ANT_A && best_ant != ANT_B)
2706 rate->ant = first_antenna(valid_tx_ant);
2707 else
2708 rate->ant = best_ant;
2709
2710 rate->sgi = false;
2711 rate->ldpc = false;
2712 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2713
2714 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2715 BITS_PER_LONG);
2716
2717 if (band == IEEE80211_BAND_5GHZ) {
2718 rate->type = LQ_LEGACY_A;
2719 initial_rates = rs_optimal_rates_5ghz_legacy;
2720 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2721 } else {
2722 rate->type = LQ_LEGACY_G;
2723 initial_rates = rs_optimal_rates_24ghz_legacy;
2724 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2725 }
2726
2727 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2728 goto out;
2729
2730 /* Start from a higher rate if the corresponding debug capability
2731 * is enabled. The rate is chosen according to AP capabilities.
2732 * In case of VHT/HT when the rssi is low fallback to the case of
2733 * legacy rates.
2734 */
2735 if (sta->vht_cap.vht_supported &&
2736 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2737 if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) {
2738 initial_rates = rs_optimal_rates_vht_40_80mhz;
2739 nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz);
2740 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
2741 rate->bw = RATE_MCS_CHAN_WIDTH_80;
2742 else
2743 rate->bw = RATE_MCS_CHAN_WIDTH_40;
2744 } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) {
2745 initial_rates = rs_optimal_rates_vht_20mhz;
2746 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2747 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2748 } else {
2749 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2750 goto out;
2751 }
2752 active_rate = lq_sta->active_siso_rate;
2753 rate->type = LQ_VHT_SISO;
2754 } else if (sta->ht_cap.ht_supported &&
2755 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2756 initial_rates = rs_optimal_rates_ht;
2757 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2758 active_rate = lq_sta->active_siso_rate;
2759 rate->type = LQ_HT_SISO;
2760 } else {
2761 active_rate = lq_sta->active_legacy_rate;
2762 }
2763
2764 for (i = 0; i < nentries; i++) {
2765 int rate_idx = initial_rates[i].rate_idx;
2766
2767 if ((best_rssi >= initial_rates[i].rssi) &&
2768 (BIT(rate_idx) & active_rate)) {
2769 rate->index = rate_idx;
2770 break;
2771 }
2772 }
2773
2774 out:
2775 rs_dump_rate(mvm, rate, "INITIAL");
2776 }
2777
2778 /* Save info about RSSI of last Rx */
2779 void rs_update_last_rssi(struct iwl_mvm *mvm,
2780 struct iwl_lq_sta *lq_sta,
2781 struct ieee80211_rx_status *rx_status)
2782 {
2783 int i;
2784
2785 lq_sta->pers.chains = rx_status->chains;
2786 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2787 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2788 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2789 lq_sta->pers.last_rssi = S8_MIN;
2790
2791 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2792 if (!(lq_sta->pers.chains & BIT(i)))
2793 continue;
2794
2795 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2796 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2797 }
2798 }
2799
2800 /**
2801 * rs_initialize_lq - Initialize a station's hardware rate table
2802 *
2803 * The uCode's station table contains a table of fallback rates
2804 * for automatic fallback during transmission.
2805 *
2806 * NOTE: This sets up a default set of values. These will be replaced later
2807 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2808 * rc80211_simple.
2809 *
2810 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2811 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2812 * which requires station table entry to exist).
2813 */
2814 static void rs_initialize_lq(struct iwl_mvm *mvm,
2815 struct ieee80211_sta *sta,
2816 struct iwl_lq_sta *lq_sta,
2817 enum ieee80211_band band,
2818 bool init)
2819 {
2820 struct iwl_scale_tbl_info *tbl;
2821 struct rs_rate *rate;
2822 u8 active_tbl = 0;
2823
2824 if (!sta || !lq_sta)
2825 return;
2826
2827 if (!lq_sta->search_better_tbl)
2828 active_tbl = lq_sta->active_tbl;
2829 else
2830 active_tbl = 1 - lq_sta->active_tbl;
2831
2832 tbl = &(lq_sta->lq_info[active_tbl]);
2833 rate = &tbl->rate;
2834
2835 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2836 rs_init_optimal_rate(mvm, sta, lq_sta);
2837
2838 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2839 tbl->column = rs_get_column_from_rate(rate);
2840
2841 rs_set_expected_tpt_table(lq_sta, tbl);
2842 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2843 /* TODO restore station should remember the lq cmd */
2844 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2845 }
2846
2847 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2848 struct ieee80211_tx_rate_control *txrc)
2849 {
2850 struct sk_buff *skb = txrc->skb;
2851 struct iwl_op_mode *op_mode __maybe_unused =
2852 (struct iwl_op_mode *)mvm_r;
2853 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2854 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2855 struct iwl_lq_sta *lq_sta = mvm_sta;
2856 struct rs_rate *optimal_rate;
2857 u32 last_ucode_rate;
2858
2859 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2860 /* if vif isn't initialized mvm doesn't know about
2861 * this station, so don't do anything with the it
2862 */
2863 sta = NULL;
2864 mvm_sta = NULL;
2865 }
2866
2867 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2868
2869 /* Treat uninitialized rate scaling data same as non-existing. */
2870 if (lq_sta && !lq_sta->pers.drv) {
2871 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2872 mvm_sta = NULL;
2873 }
2874
2875 /* Send management frames and NO_ACK data using lowest rate. */
2876 if (rate_control_send_low(sta, mvm_sta, txrc))
2877 return;
2878
2879 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2880 info->band, &info->control.rates[0]);
2881 info->control.rates[0].count = 1;
2882
2883 /* Report the optimal rate based on rssi and STA caps if we haven't
2884 * converged yet (too little traffic) or exploring other modulations
2885 */
2886 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2887 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2888 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2889 optimal_rate);
2890 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2891 &txrc->reported_rate);
2892 }
2893 }
2894
2895 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2896 gfp_t gfp)
2897 {
2898 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2899 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2900 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2901 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2902
2903 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2904
2905 lq_sta->pers.drv = mvm;
2906 #ifdef CONFIG_MAC80211_DEBUGFS
2907 lq_sta->pers.dbg_fixed_rate = 0;
2908 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2909 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2910 #endif
2911 lq_sta->pers.chains = 0;
2912 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2913 lq_sta->pers.last_rssi = S8_MIN;
2914
2915 return &sta_priv->lq_sta;
2916 }
2917
2918 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2919 int nss)
2920 {
2921 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2922 (0x3 << (2 * (nss - 1)));
2923 rx_mcs >>= (2 * (nss - 1));
2924
2925 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2926 return IWL_RATE_MCS_7_INDEX;
2927 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2928 return IWL_RATE_MCS_8_INDEX;
2929 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2930 return IWL_RATE_MCS_9_INDEX;
2931
2932 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2933 return -1;
2934 }
2935
2936 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2937 struct ieee80211_sta_vht_cap *vht_cap,
2938 struct iwl_lq_sta *lq_sta)
2939 {
2940 int i;
2941 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2942
2943 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2944 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2945 if (i == IWL_RATE_9M_INDEX)
2946 continue;
2947
2948 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2949 if (i == IWL_RATE_MCS_9_INDEX &&
2950 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2951 continue;
2952
2953 lq_sta->active_siso_rate |= BIT(i);
2954 }
2955 }
2956
2957 if (sta->rx_nss < 2)
2958 return;
2959
2960 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2961 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2962 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2963 if (i == IWL_RATE_9M_INDEX)
2964 continue;
2965
2966 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2967 if (i == IWL_RATE_MCS_9_INDEX &&
2968 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2969 continue;
2970
2971 lq_sta->active_mimo2_rate |= BIT(i);
2972 }
2973 }
2974 }
2975
2976 static void rs_ht_init(struct iwl_mvm *mvm,
2977 struct ieee80211_sta *sta,
2978 struct iwl_lq_sta *lq_sta,
2979 struct ieee80211_sta_ht_cap *ht_cap)
2980 {
2981 /* active_siso_rate mask includes 9 MBits (bit 5),
2982 * and CCK (bits 0-3), supp_rates[] does not;
2983 * shift to convert format, force 9 MBits off.
2984 */
2985 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2986 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2987 lq_sta->active_siso_rate &= ~((u16)0x2);
2988 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2989
2990 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2991 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2992 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2993 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2994
2995 if (mvm->cfg->ht_params->ldpc &&
2996 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2997 lq_sta->ldpc = true;
2998
2999 if (mvm->cfg->ht_params->stbc &&
3000 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3001 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3002 lq_sta->stbc_capable = true;
3003
3004 lq_sta->is_vht = false;
3005 }
3006
3007 static void rs_vht_init(struct iwl_mvm *mvm,
3008 struct ieee80211_sta *sta,
3009 struct iwl_lq_sta *lq_sta,
3010 struct ieee80211_sta_vht_cap *vht_cap)
3011 {
3012 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3013
3014 if (mvm->cfg->ht_params->ldpc &&
3015 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3016 lq_sta->ldpc = true;
3017
3018 if (mvm->cfg->ht_params->stbc &&
3019 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3020 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3021 lq_sta->stbc_capable = true;
3022
3023 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3024 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3025 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3026 lq_sta->bfer_capable = true;
3027
3028 lq_sta->is_vht = true;
3029 }
3030
3031 #ifdef CONFIG_IWLWIFI_DEBUGFS
3032 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3033 {
3034 spin_lock_bh(&mvm->drv_stats_lock);
3035 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3036 spin_unlock_bh(&mvm->drv_stats_lock);
3037 }
3038
3039 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3040 {
3041 u8 nss = 0, mcs = 0;
3042
3043 spin_lock(&mvm->drv_stats_lock);
3044
3045 if (agg)
3046 mvm->drv_rx_stats.agg_frames++;
3047
3048 mvm->drv_rx_stats.success_frames++;
3049
3050 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3051 case RATE_MCS_CHAN_WIDTH_20:
3052 mvm->drv_rx_stats.bw_20_frames++;
3053 break;
3054 case RATE_MCS_CHAN_WIDTH_40:
3055 mvm->drv_rx_stats.bw_40_frames++;
3056 break;
3057 case RATE_MCS_CHAN_WIDTH_80:
3058 mvm->drv_rx_stats.bw_80_frames++;
3059 break;
3060 default:
3061 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3062 }
3063
3064 if (rate & RATE_MCS_HT_MSK) {
3065 mvm->drv_rx_stats.ht_frames++;
3066 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
3067 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3068 } else if (rate & RATE_MCS_VHT_MSK) {
3069 mvm->drv_rx_stats.vht_frames++;
3070 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3071 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3072 RATE_VHT_MCS_NSS_POS) + 1;
3073 } else {
3074 mvm->drv_rx_stats.legacy_frames++;
3075 }
3076
3077 if (nss == 1)
3078 mvm->drv_rx_stats.siso_frames++;
3079 else if (nss == 2)
3080 mvm->drv_rx_stats.mimo2_frames++;
3081
3082 if (rate & RATE_MCS_SGI_MSK)
3083 mvm->drv_rx_stats.sgi_frames++;
3084 else
3085 mvm->drv_rx_stats.ngi_frames++;
3086
3087 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3088 mvm->drv_rx_stats.last_frame_idx =
3089 (mvm->drv_rx_stats.last_frame_idx + 1) %
3090 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3091
3092 spin_unlock(&mvm->drv_stats_lock);
3093 }
3094 #endif
3095
3096 /*
3097 * Called after adding a new station to initialize rate scaling
3098 */
3099 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3100 enum ieee80211_band band, bool init)
3101 {
3102 int i, j;
3103 struct ieee80211_hw *hw = mvm->hw;
3104 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3105 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3106 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3107 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3108 struct ieee80211_supported_band *sband;
3109 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3110
3111 /* clear all non-persistent lq data */
3112 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3113
3114 sband = hw->wiphy->bands[band];
3115
3116 lq_sta->lq.sta_id = sta_priv->sta_id;
3117 sta_priv->tlc_amsdu = false;
3118
3119 for (j = 0; j < LQ_SIZE; j++)
3120 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3121
3122 lq_sta->flush_timer = 0;
3123 lq_sta->last_tx = jiffies;
3124
3125 IWL_DEBUG_RATE(mvm,
3126 "LQ: *** rate scale station global init for station %d ***\n",
3127 sta_priv->sta_id);
3128 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3129 * the lowest or the highest rate.. Could consider using RSSI from
3130 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3131 * after assoc.. */
3132
3133 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3134 lq_sta->band = sband->band;
3135 /*
3136 * active legacy rates as per supported rates bitmap
3137 */
3138 supp = sta->supp_rates[sband->band];
3139 lq_sta->active_legacy_rate = 0;
3140 for_each_set_bit(i, &supp, BITS_PER_LONG)
3141 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3142
3143 /* TODO: should probably account for rx_highest for both HT/VHT */
3144 if (!vht_cap || !vht_cap->vht_supported)
3145 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3146 else
3147 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3148
3149 lq_sta->max_legacy_rate_idx =
3150 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3151 lq_sta->max_siso_rate_idx =
3152 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3153 lq_sta->max_mimo2_rate_idx =
3154 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3155
3156 IWL_DEBUG_RATE(mvm,
3157 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3158 lq_sta->active_legacy_rate,
3159 lq_sta->active_siso_rate,
3160 lq_sta->active_mimo2_rate,
3161 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3162 lq_sta->bfer_capable);
3163 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3164 lq_sta->max_legacy_rate_idx,
3165 lq_sta->max_siso_rate_idx,
3166 lq_sta->max_mimo2_rate_idx);
3167
3168 /* These values will be overridden later */
3169 lq_sta->lq.single_stream_ant_msk =
3170 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3171 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3172
3173 /* as default allow aggregation for all tids */
3174 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3175 lq_sta->is_agg = 0;
3176 #ifdef CONFIG_IWLWIFI_DEBUGFS
3177 iwl_mvm_reset_frame_stats(mvm);
3178 #endif
3179 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3180 }
3181
3182 static void rs_rate_update(void *mvm_r,
3183 struct ieee80211_supported_band *sband,
3184 struct cfg80211_chan_def *chandef,
3185 struct ieee80211_sta *sta, void *priv_sta,
3186 u32 changed)
3187 {
3188 u8 tid;
3189 struct iwl_op_mode *op_mode =
3190 (struct iwl_op_mode *)mvm_r;
3191 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3192
3193 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3194 return;
3195
3196 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3197 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3198 ieee80211_stop_tx_ba_session(sta, tid);
3199
3200 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3201 }
3202
3203 #ifdef CONFIG_MAC80211_DEBUGFS
3204 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3205 struct iwl_lq_cmd *lq_cmd,
3206 enum ieee80211_band band,
3207 u32 ucode_rate)
3208 {
3209 struct rs_rate rate;
3210 int i;
3211 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3212 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3213 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3214
3215 for (i = 0; i < num_rates; i++)
3216 lq_cmd->rs_table[i] = ucode_rate_le32;
3217
3218 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3219
3220 if (is_mimo(&rate))
3221 lq_cmd->mimo_delim = num_rates - 1;
3222 else
3223 lq_cmd->mimo_delim = 0;
3224
3225 lq_cmd->reduced_tpc = 0;
3226
3227 if (num_of_ant(ant) == 1)
3228 lq_cmd->single_stream_ant_msk = ant;
3229
3230 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3231 }
3232 #endif /* CONFIG_MAC80211_DEBUGFS */
3233
3234 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3235 struct iwl_lq_sta *lq_sta,
3236 struct rs_rate *rate,
3237 __le32 *rs_table, int *rs_table_index,
3238 int num_rates, int num_retries,
3239 u8 valid_tx_ant, bool toggle_ant)
3240 {
3241 int i, j;
3242 __le32 ucode_rate;
3243 bool bottom_reached = false;
3244 int prev_rate_idx = rate->index;
3245 int end = LINK_QUAL_MAX_RETRY_NUM;
3246 int index = *rs_table_index;
3247
3248 for (i = 0; i < num_rates && index < end; i++) {
3249 for (j = 0; j < num_retries && index < end; j++, index++) {
3250 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3251 rate));
3252 rs_table[index] = ucode_rate;
3253 if (toggle_ant)
3254 rs_toggle_antenna(valid_tx_ant, rate);
3255 }
3256
3257 prev_rate_idx = rate->index;
3258 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3259 if (bottom_reached && !is_legacy(rate))
3260 break;
3261 }
3262
3263 if (!bottom_reached && !is_legacy(rate))
3264 rate->index = prev_rate_idx;
3265
3266 *rs_table_index = index;
3267 }
3268
3269 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3270 * column the rate table should look like this:
3271 *
3272 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3273 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3274 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3275 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3276 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3277 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3278 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3279 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3280 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3281 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3282 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3283 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3284 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3285 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3286 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3287 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3288 */
3289 static void rs_build_rates_table(struct iwl_mvm *mvm,
3290 struct ieee80211_sta *sta,
3291 struct iwl_lq_sta *lq_sta,
3292 const struct rs_rate *initial_rate)
3293 {
3294 struct rs_rate rate;
3295 int num_rates, num_retries, index = 0;
3296 u8 valid_tx_ant = 0;
3297 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3298 bool toggle_ant = false;
3299
3300 memcpy(&rate, initial_rate, sizeof(rate));
3301
3302 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3303
3304 /* TODO: remove old API when min FW API hits 14 */
3305 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3306 rs_stbc_allow(mvm, sta, lq_sta))
3307 rate.stbc = true;
3308
3309 if (is_siso(&rate)) {
3310 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3311 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3312 } else if (is_mimo(&rate)) {
3313 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3314 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3315 } else {
3316 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3317 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3318 toggle_ant = true;
3319 }
3320
3321 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3322 num_rates, num_retries, valid_tx_ant,
3323 toggle_ant);
3324
3325 rs_get_lower_rate_down_column(lq_sta, &rate);
3326
3327 if (is_siso(&rate)) {
3328 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3329 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3330 lq_cmd->mimo_delim = index;
3331 } else if (is_legacy(&rate)) {
3332 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3333 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3334 } else {
3335 WARN_ON_ONCE(1);
3336 }
3337
3338 toggle_ant = true;
3339
3340 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3341 num_rates, num_retries, valid_tx_ant,
3342 toggle_ant);
3343
3344 rs_get_lower_rate_down_column(lq_sta, &rate);
3345
3346 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3347 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3348
3349 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3350 num_rates, num_retries, valid_tx_ant,
3351 toggle_ant);
3352
3353 }
3354
3355 struct rs_bfer_active_iter_data {
3356 struct ieee80211_sta *exclude_sta;
3357 struct iwl_mvm_sta *bfer_mvmsta;
3358 };
3359
3360 static void rs_bfer_active_iter(void *_data,
3361 struct ieee80211_sta *sta)
3362 {
3363 struct rs_bfer_active_iter_data *data = _data;
3364 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3365 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3366 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3367
3368 if (sta == data->exclude_sta)
3369 return;
3370
3371 /* The current sta has BFER allowed */
3372 if (ss_params & LQ_SS_BFER_ALLOWED) {
3373 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3374
3375 data->bfer_mvmsta = mvmsta;
3376 }
3377 }
3378
3379 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3380 {
3381 int prio = -1;
3382 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3383
3384 switch (viftype) {
3385 case NL80211_IFTYPE_AP:
3386 case NL80211_IFTYPE_P2P_GO:
3387 prio = 3;
3388 break;
3389 case NL80211_IFTYPE_P2P_CLIENT:
3390 prio = 2;
3391 break;
3392 case NL80211_IFTYPE_STATION:
3393 prio = 1;
3394 break;
3395 default:
3396 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3397 prio = -1;
3398 }
3399
3400 return prio;
3401 }
3402
3403 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3404 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3405 struct iwl_mvm_sta *sta2)
3406 {
3407 int prio1 = rs_bfer_priority(sta1);
3408 int prio2 = rs_bfer_priority(sta2);
3409
3410 if (prio1 > prio2)
3411 return 1;
3412 if (prio1 < prio2)
3413 return -1;
3414 return 0;
3415 }
3416
3417 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3418 struct ieee80211_sta *sta,
3419 struct iwl_lq_sta *lq_sta,
3420 const struct rs_rate *initial_rate)
3421 {
3422 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3423 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3424 struct rs_bfer_active_iter_data data = {
3425 .exclude_sta = sta,
3426 .bfer_mvmsta = NULL,
3427 };
3428 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3429 u32 ss_params = LQ_SS_PARAMS_VALID;
3430
3431 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3432 goto out;
3433
3434 #ifdef CONFIG_MAC80211_DEBUGFS
3435 /* Check if forcing the decision is configured.
3436 * Note that SISO is forced by not allowing STBC or BFER
3437 */
3438 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3439 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3440 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3441 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3442
3443 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3444 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3445 lq_sta->pers.ss_force);
3446 goto out;
3447 }
3448 #endif
3449
3450 if (lq_sta->stbc_capable)
3451 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3452
3453 if (!lq_sta->bfer_capable)
3454 goto out;
3455
3456 ieee80211_iterate_stations_atomic(mvm->hw,
3457 rs_bfer_active_iter,
3458 &data);
3459 bfer_mvmsta = data.bfer_mvmsta;
3460
3461 /* This code is safe as it doesn't run concurrently for different
3462 * stations. This is guaranteed by the fact that calls to
3463 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3464 */
3465 if (!bfer_mvmsta) {
3466 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3467
3468 ss_params |= LQ_SS_BFER_ALLOWED;
3469 goto out;
3470 }
3471
3472 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3473 bfer_mvmsta->sta_id);
3474
3475 /* Disallow BFER on another STA if active and we're a higher priority */
3476 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3477 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3478 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3479
3480 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3481 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3482 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3483
3484 ss_params |= LQ_SS_BFER_ALLOWED;
3485 IWL_DEBUG_RATE(mvm,
3486 "Lower priority BFER sta found (%d). Switch BFER\n",
3487 bfer_mvmsta->sta_id);
3488 }
3489 out:
3490 lq_cmd->ss_params = cpu_to_le32(ss_params);
3491 }
3492
3493 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3494 struct ieee80211_sta *sta,
3495 struct iwl_lq_sta *lq_sta,
3496 const struct rs_rate *initial_rate)
3497 {
3498 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3499 struct iwl_mvm_sta *mvmsta;
3500 struct iwl_mvm_vif *mvmvif;
3501
3502 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3503 lq_cmd->agg_time_limit =
3504 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3505
3506 #ifdef CONFIG_MAC80211_DEBUGFS
3507 if (lq_sta->pers.dbg_fixed_rate) {
3508 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3509 lq_sta->band,
3510 lq_sta->pers.dbg_fixed_rate);
3511 return;
3512 }
3513 #endif
3514 if (WARN_ON_ONCE(!sta || !initial_rate))
3515 return;
3516
3517 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3518
3519 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3520 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3521
3522 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3523 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3524
3525 if (num_of_ant(initial_rate->ant) == 1)
3526 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3527
3528 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3529
3530 /*
3531 * In case of low latency, tell the firmware to leave a frame in the
3532 * Tx Fifo so that it can start a transaction in the same TxOP. This
3533 * basically allows the firmware to send bursts.
3534 */
3535 if (iwl_mvm_vif_low_latency(mvmvif))
3536 lq_cmd->agg_frame_cnt_limit--;
3537
3538 if (mvmsta->vif->p2p)
3539 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3540
3541 lq_cmd->agg_time_limit =
3542 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3543 }
3544
3545 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3546 {
3547 return hw->priv;
3548 }
3549 /* rate scale requires free function to be implemented */
3550 static void rs_free(void *mvm_rate)
3551 {
3552 return;
3553 }
3554
3555 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3556 void *mvm_sta)
3557 {
3558 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3559 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3560
3561 IWL_DEBUG_RATE(mvm, "enter\n");
3562 IWL_DEBUG_RATE(mvm, "leave\n");
3563 }
3564
3565 #ifdef CONFIG_MAC80211_DEBUGFS
3566 int rs_pretty_print_rate(char *buf, const u32 rate)
3567 {
3568
3569 char *type, *bw;
3570 u8 mcs = 0, nss = 0;
3571 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3572
3573 if (!(rate & RATE_MCS_HT_MSK) &&
3574 !(rate & RATE_MCS_VHT_MSK)) {
3575 int index = iwl_hwrate_to_plcp_idx(rate);
3576
3577 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3578 rs_pretty_ant(ant),
3579 index == IWL_RATE_INVALID ? "BAD" :
3580 iwl_rate_mcs[index].mbps);
3581 }
3582
3583 if (rate & RATE_MCS_VHT_MSK) {
3584 type = "VHT";
3585 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3586 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3587 >> RATE_VHT_MCS_NSS_POS) + 1;
3588 } else if (rate & RATE_MCS_HT_MSK) {
3589 type = "HT";
3590 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3591 } else {
3592 type = "Unknown"; /* shouldn't happen */
3593 }
3594
3595 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3596 case RATE_MCS_CHAN_WIDTH_20:
3597 bw = "20Mhz";
3598 break;
3599 case RATE_MCS_CHAN_WIDTH_40:
3600 bw = "40Mhz";
3601 break;
3602 case RATE_MCS_CHAN_WIDTH_80:
3603 bw = "80Mhz";
3604 break;
3605 case RATE_MCS_CHAN_WIDTH_160:
3606 bw = "160Mhz";
3607 break;
3608 default:
3609 bw = "BAD BW";
3610 }
3611
3612 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3613 type, rs_pretty_ant(ant), bw, mcs, nss,
3614 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3615 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3616 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3617 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3618 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3619 }
3620
3621 /**
3622 * Program the device to use fixed rate for frame transmit
3623 * This is for debugging/testing only
3624 * once the device start use fixed rate, we need to reload the module
3625 * to being back the normal operation.
3626 */
3627 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3628 struct iwl_lq_sta *lq_sta)
3629 {
3630 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3631 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3632 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3633
3634 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3635 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3636
3637 if (lq_sta->pers.dbg_fixed_rate) {
3638 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3639 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3640 }
3641 }
3642
3643 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3644 const char __user *user_buf, size_t count, loff_t *ppos)
3645 {
3646 struct iwl_lq_sta *lq_sta = file->private_data;
3647 struct iwl_mvm *mvm;
3648 char buf[64];
3649 size_t buf_size;
3650 u32 parsed_rate;
3651
3652 mvm = lq_sta->pers.drv;
3653 memset(buf, 0, sizeof(buf));
3654 buf_size = min(count, sizeof(buf) - 1);
3655 if (copy_from_user(buf, user_buf, buf_size))
3656 return -EFAULT;
3657
3658 if (sscanf(buf, "%x", &parsed_rate) == 1)
3659 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3660 else
3661 lq_sta->pers.dbg_fixed_rate = 0;
3662
3663 rs_program_fix_rate(mvm, lq_sta);
3664
3665 return count;
3666 }
3667
3668 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3669 char __user *user_buf, size_t count, loff_t *ppos)
3670 {
3671 char *buff;
3672 int desc = 0;
3673 int i = 0;
3674 ssize_t ret;
3675
3676 struct iwl_lq_sta *lq_sta = file->private_data;
3677 struct iwl_mvm_sta *mvmsta =
3678 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3679 struct iwl_mvm *mvm;
3680 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3681 struct rs_rate *rate = &tbl->rate;
3682 u32 ss_params;
3683
3684 mvm = lq_sta->pers.drv;
3685 buff = kmalloc(2048, GFP_KERNEL);
3686 if (!buff)
3687 return -ENOMEM;
3688
3689 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3690 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3691 lq_sta->total_failed, lq_sta->total_success,
3692 lq_sta->active_legacy_rate);
3693 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3694 lq_sta->pers.dbg_fixed_rate);
3695 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3696 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3697 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3698 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3699 desc += sprintf(buff+desc, "lq type %s\n",
3700 (is_legacy(rate)) ? "legacy" :
3701 is_vht(rate) ? "VHT" : "HT");
3702 if (!is_legacy(rate)) {
3703 desc += sprintf(buff + desc, " %s",
3704 (is_siso(rate)) ? "SISO" : "MIMO2");
3705 desc += sprintf(buff + desc, " %s",
3706 (is_ht20(rate)) ? "20MHz" :
3707 (is_ht40(rate)) ? "40MHz" :
3708 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3709 desc += sprintf(buff + desc, " %s %s %s %s\n",
3710 (rate->sgi) ? "SGI" : "NGI",
3711 (rate->ldpc) ? "LDPC" : "BCC",
3712 (lq_sta->is_agg) ? "AGG on" : "",
3713 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3714 }
3715 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3716 lq_sta->last_rate_n_flags);
3717 desc += sprintf(buff+desc,
3718 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3719 lq_sta->lq.flags,
3720 lq_sta->lq.mimo_delim,
3721 lq_sta->lq.single_stream_ant_msk,
3722 lq_sta->lq.dual_stream_ant_msk);
3723
3724 desc += sprintf(buff+desc,
3725 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3726 le16_to_cpu(lq_sta->lq.agg_time_limit),
3727 lq_sta->lq.agg_disable_start_th,
3728 lq_sta->lq.agg_frame_cnt_limit);
3729
3730 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3731 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3732 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3733 (ss_params & LQ_SS_PARAMS_VALID) ?
3734 "VALID" : "INVALID",
3735 (ss_params & LQ_SS_BFER_ALLOWED) ?
3736 ", BFER" : "",
3737 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3738 ", STBC" : "",
3739 (ss_params & LQ_SS_FORCE) ?
3740 ", FORCE" : "");
3741 desc += sprintf(buff+desc,
3742 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3743 lq_sta->lq.initial_rate_index[0],
3744 lq_sta->lq.initial_rate_index[1],
3745 lq_sta->lq.initial_rate_index[2],
3746 lq_sta->lq.initial_rate_index[3]);
3747
3748 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3749 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3750
3751 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3752 desc += rs_pretty_print_rate(buff+desc, r);
3753 }
3754
3755 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3756 kfree(buff);
3757 return ret;
3758 }
3759
3760 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3761 .write = rs_sta_dbgfs_scale_table_write,
3762 .read = rs_sta_dbgfs_scale_table_read,
3763 .open = simple_open,
3764 .llseek = default_llseek,
3765 };
3766 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3767 char __user *user_buf, size_t count, loff_t *ppos)
3768 {
3769 char *buff;
3770 int desc = 0;
3771 int i, j;
3772 ssize_t ret;
3773 struct iwl_scale_tbl_info *tbl;
3774 struct rs_rate *rate;
3775 struct iwl_lq_sta *lq_sta = file->private_data;
3776
3777 buff = kmalloc(1024, GFP_KERNEL);
3778 if (!buff)
3779 return -ENOMEM;
3780
3781 for (i = 0; i < LQ_SIZE; i++) {
3782 tbl = &(lq_sta->lq_info[i]);
3783 rate = &tbl->rate;
3784 desc += sprintf(buff+desc,
3785 "%s type=%d SGI=%d BW=%s DUP=0\n"
3786 "index=%d\n",
3787 lq_sta->active_tbl == i ? "*" : "x",
3788 rate->type,
3789 rate->sgi,
3790 is_ht20(rate) ? "20Mhz" :
3791 is_ht40(rate) ? "40Mhz" :
3792 is_ht80(rate) ? "80Mhz" : "ERR",
3793 rate->index);
3794 for (j = 0; j < IWL_RATE_COUNT; j++) {
3795 desc += sprintf(buff+desc,
3796 "counter=%d success=%d %%=%d\n",
3797 tbl->win[j].counter,
3798 tbl->win[j].success_counter,
3799 tbl->win[j].success_ratio);
3800 }
3801 }
3802 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3803 kfree(buff);
3804 return ret;
3805 }
3806
3807 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3808 .read = rs_sta_dbgfs_stats_table_read,
3809 .open = simple_open,
3810 .llseek = default_llseek,
3811 };
3812
3813 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3814 char __user *user_buf,
3815 size_t count, loff_t *ppos)
3816 {
3817 static const char * const column_name[] = {
3818 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3819 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3820 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3821 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3822 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3823 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3824 [RS_COLUMN_MIMO2] = "MIMO2",
3825 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3826 };
3827
3828 static const char * const rate_name[] = {
3829 [IWL_RATE_1M_INDEX] = "1M",
3830 [IWL_RATE_2M_INDEX] = "2M",
3831 [IWL_RATE_5M_INDEX] = "5.5M",
3832 [IWL_RATE_11M_INDEX] = "11M",
3833 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3834 [IWL_RATE_9M_INDEX] = "9M",
3835 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3836 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3837 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3838 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3839 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3840 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3841 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3842 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3843 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3844 };
3845
3846 char *buff, *pos, *endpos;
3847 int col, rate;
3848 ssize_t ret;
3849 struct iwl_lq_sta *lq_sta = file->private_data;
3850 struct rs_rate_stats *stats;
3851 static const size_t bufsz = 1024;
3852
3853 buff = kmalloc(bufsz, GFP_KERNEL);
3854 if (!buff)
3855 return -ENOMEM;
3856
3857 pos = buff;
3858 endpos = pos + bufsz;
3859
3860 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3861 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3862 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3863 pos += scnprintf(pos, endpos - pos, "\n");
3864
3865 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3866 pos += scnprintf(pos, endpos - pos,
3867 "%s,", column_name[col]);
3868
3869 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3870 stats = &(lq_sta->pers.tx_stats[col][rate]);
3871 pos += scnprintf(pos, endpos - pos,
3872 "%llu/%llu,",
3873 stats->success,
3874 stats->total);
3875 }
3876 pos += scnprintf(pos, endpos - pos, "\n");
3877 }
3878
3879 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3880 kfree(buff);
3881 return ret;
3882 }
3883
3884 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3885 const char __user *user_buf,
3886 size_t count, loff_t *ppos)
3887 {
3888 struct iwl_lq_sta *lq_sta = file->private_data;
3889 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3890
3891 return count;
3892 }
3893
3894 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3895 .read = rs_sta_dbgfs_drv_tx_stats_read,
3896 .write = rs_sta_dbgfs_drv_tx_stats_write,
3897 .open = simple_open,
3898 .llseek = default_llseek,
3899 };
3900
3901 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3902 char __user *user_buf,
3903 size_t count, loff_t *ppos)
3904 {
3905 struct iwl_lq_sta *lq_sta = file->private_data;
3906 char buf[12];
3907 int bufsz = sizeof(buf);
3908 int pos = 0;
3909 static const char * const ss_force_name[] = {
3910 [RS_SS_FORCE_NONE] = "none",
3911 [RS_SS_FORCE_STBC] = "stbc",
3912 [RS_SS_FORCE_BFER] = "bfer",
3913 [RS_SS_FORCE_SISO] = "siso",
3914 };
3915
3916 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3917 ss_force_name[lq_sta->pers.ss_force]);
3918 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3919 }
3920
3921 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3922 size_t count, loff_t *ppos)
3923 {
3924 struct iwl_mvm *mvm = lq_sta->pers.drv;
3925 int ret = 0;
3926
3927 if (!strncmp("none", buf, 4)) {
3928 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3929 } else if (!strncmp("siso", buf, 4)) {
3930 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3931 } else if (!strncmp("stbc", buf, 4)) {
3932 if (lq_sta->stbc_capable) {
3933 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3934 } else {
3935 IWL_ERR(mvm,
3936 "can't force STBC. peer doesn't support\n");
3937 ret = -EINVAL;
3938 }
3939 } else if (!strncmp("bfer", buf, 4)) {
3940 if (lq_sta->bfer_capable) {
3941 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3942 } else {
3943 IWL_ERR(mvm,
3944 "can't force BFER. peer doesn't support\n");
3945 ret = -EINVAL;
3946 }
3947 } else {
3948 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3949 ret = -EINVAL;
3950 }
3951 return ret ?: count;
3952 }
3953
3954 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3955 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3956 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3957 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3958 &iwl_dbgfs_##name##_ops)) \
3959 goto err; \
3960 } while (0)
3961
3962 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3963
3964 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3965 {
3966 struct iwl_lq_sta *lq_sta = priv_sta;
3967 struct iwl_mvm_sta *mvmsta;
3968
3969 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3970
3971 if (!mvmsta->vif)
3972 return;
3973
3974 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3975 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3976 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3977 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3978 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3979 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3980 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3981 &lq_sta->tx_agg_tid_en);
3982 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3983 &lq_sta->pers.dbg_fixed_txp_reduction);
3984
3985 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3986 return;
3987 err:
3988 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3989 }
3990
3991 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3992 {
3993 }
3994 #endif
3995
3996 /*
3997 * Initialization of rate scaling information is done by driver after
3998 * the station is added. Since mac80211 calls this function before a
3999 * station is added we ignore it.
4000 */
4001 static void rs_rate_init_stub(void *mvm_r,
4002 struct ieee80211_supported_band *sband,
4003 struct cfg80211_chan_def *chandef,
4004 struct ieee80211_sta *sta, void *mvm_sta)
4005 {
4006 }
4007
4008 static const struct rate_control_ops rs_mvm_ops = {
4009 .name = RS_NAME,
4010 .tx_status = rs_mac80211_tx_status,
4011 .get_rate = rs_get_rate,
4012 .rate_init = rs_rate_init_stub,
4013 .alloc = rs_alloc,
4014 .free = rs_free,
4015 .alloc_sta = rs_alloc_sta,
4016 .free_sta = rs_free_sta,
4017 .rate_update = rs_rate_update,
4018 #ifdef CONFIG_MAC80211_DEBUGFS
4019 .add_sta_debugfs = rs_add_debugfs,
4020 .remove_sta_debugfs = rs_remove_debugfs,
4021 #endif
4022 };
4023
4024 int iwl_mvm_rate_control_register(void)
4025 {
4026 return ieee80211_rate_control_register(&rs_mvm_ops);
4027 }
4028
4029 void iwl_mvm_rate_control_unregister(void)
4030 {
4031 ieee80211_rate_control_unregister(&rs_mvm_ops);
4032 }
4033
4034 /**
4035 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4036 * Tx protection, according to this request and previous requests,
4037 * and send the LQ command.
4038 * @mvmsta: The station
4039 * @enable: Enable Tx protection?
4040 */
4041 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4042 bool enable)
4043 {
4044 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4045
4046 lockdep_assert_held(&mvm->mutex);
4047
4048 if (enable) {
4049 if (mvmsta->tx_protection == 0)
4050 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4051 mvmsta->tx_protection++;
4052 } else {
4053 mvmsta->tx_protection--;
4054 if (mvmsta->tx_protection == 0)
4055 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4056 }
4057
4058 return iwl_mvm_send_lq_cmd(mvm, lq, false);
4059 }
Linux kernel - Deliverables
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