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Merge tag 'for-linus-20170825' of git://git.infradead.org/linux-mtd
[mirror_ubuntu-artful-kernel.git] / drivers / net / wireless / intel / iwlwifi / mvm / rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
5 * Copyright(c) 2016 - 2017 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 if (!sta->ht_cap.ht_supported)
165 return false;
166
167 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
168 return false;
169
170 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
171 return false;
172
173 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
174 return false;
175
176 if (mvm->nvm_data->sku_cap_mimo_disabled)
177 return false;
178
179 return true;
180 }
181
182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
183 struct rs_rate *rate,
184 const struct rs_tx_column *next_col)
185 {
186 if (!sta->ht_cap.ht_supported)
187 return false;
188
189 return true;
190 }
191
192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
193 struct rs_rate *rate,
194 const struct rs_tx_column *next_col)
195 {
196 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
197 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
198
199 if (is_ht20(rate) && (ht_cap->cap &
200 IEEE80211_HT_CAP_SGI_20))
201 return true;
202 if (is_ht40(rate) && (ht_cap->cap &
203 IEEE80211_HT_CAP_SGI_40))
204 return true;
205 if (is_ht80(rate) && (vht_cap->cap &
206 IEEE80211_VHT_CAP_SHORT_GI_80))
207 return true;
208 if (is_ht160(rate) && (vht_cap->cap &
209 IEEE80211_VHT_CAP_SHORT_GI_160))
210 return true;
211
212 return false;
213 }
214
215 static const struct rs_tx_column rs_tx_columns[] = {
216 [RS_COLUMN_LEGACY_ANT_A] = {
217 .mode = RS_LEGACY,
218 .ant = ANT_A,
219 .next_columns = {
220 RS_COLUMN_LEGACY_ANT_B,
221 RS_COLUMN_SISO_ANT_A,
222 RS_COLUMN_MIMO2,
223 RS_COLUMN_INVALID,
224 RS_COLUMN_INVALID,
225 RS_COLUMN_INVALID,
226 RS_COLUMN_INVALID,
227 },
228 .checks = {
229 rs_ant_allow,
230 },
231 },
232 [RS_COLUMN_LEGACY_ANT_B] = {
233 .mode = RS_LEGACY,
234 .ant = ANT_B,
235 .next_columns = {
236 RS_COLUMN_LEGACY_ANT_A,
237 RS_COLUMN_SISO_ANT_B,
238 RS_COLUMN_MIMO2,
239 RS_COLUMN_INVALID,
240 RS_COLUMN_INVALID,
241 RS_COLUMN_INVALID,
242 RS_COLUMN_INVALID,
243 },
244 .checks = {
245 rs_ant_allow,
246 },
247 },
248 [RS_COLUMN_SISO_ANT_A] = {
249 .mode = RS_SISO,
250 .ant = ANT_A,
251 .next_columns = {
252 RS_COLUMN_SISO_ANT_B,
253 RS_COLUMN_MIMO2,
254 RS_COLUMN_SISO_ANT_A_SGI,
255 RS_COLUMN_LEGACY_ANT_A,
256 RS_COLUMN_LEGACY_ANT_B,
257 RS_COLUMN_INVALID,
258 RS_COLUMN_INVALID,
259 },
260 .checks = {
261 rs_siso_allow,
262 rs_ant_allow,
263 },
264 },
265 [RS_COLUMN_SISO_ANT_B] = {
266 .mode = RS_SISO,
267 .ant = ANT_B,
268 .next_columns = {
269 RS_COLUMN_SISO_ANT_A,
270 RS_COLUMN_MIMO2,
271 RS_COLUMN_SISO_ANT_B_SGI,
272 RS_COLUMN_LEGACY_ANT_A,
273 RS_COLUMN_LEGACY_ANT_B,
274 RS_COLUMN_INVALID,
275 RS_COLUMN_INVALID,
276 },
277 .checks = {
278 rs_siso_allow,
279 rs_ant_allow,
280 },
281 },
282 [RS_COLUMN_SISO_ANT_A_SGI] = {
283 .mode = RS_SISO,
284 .ant = ANT_A,
285 .sgi = true,
286 .next_columns = {
287 RS_COLUMN_SISO_ANT_B_SGI,
288 RS_COLUMN_MIMO2_SGI,
289 RS_COLUMN_SISO_ANT_A,
290 RS_COLUMN_LEGACY_ANT_A,
291 RS_COLUMN_LEGACY_ANT_B,
292 RS_COLUMN_INVALID,
293 RS_COLUMN_INVALID,
294 },
295 .checks = {
296 rs_siso_allow,
297 rs_ant_allow,
298 rs_sgi_allow,
299 },
300 },
301 [RS_COLUMN_SISO_ANT_B_SGI] = {
302 .mode = RS_SISO,
303 .ant = ANT_B,
304 .sgi = true,
305 .next_columns = {
306 RS_COLUMN_SISO_ANT_A_SGI,
307 RS_COLUMN_MIMO2_SGI,
308 RS_COLUMN_SISO_ANT_B,
309 RS_COLUMN_LEGACY_ANT_A,
310 RS_COLUMN_LEGACY_ANT_B,
311 RS_COLUMN_INVALID,
312 RS_COLUMN_INVALID,
313 },
314 .checks = {
315 rs_siso_allow,
316 rs_ant_allow,
317 rs_sgi_allow,
318 },
319 },
320 [RS_COLUMN_MIMO2] = {
321 .mode = RS_MIMO2,
322 .ant = ANT_AB,
323 .next_columns = {
324 RS_COLUMN_SISO_ANT_A,
325 RS_COLUMN_MIMO2_SGI,
326 RS_COLUMN_LEGACY_ANT_A,
327 RS_COLUMN_LEGACY_ANT_B,
328 RS_COLUMN_INVALID,
329 RS_COLUMN_INVALID,
330 RS_COLUMN_INVALID,
331 },
332 .checks = {
333 rs_mimo_allow,
334 },
335 },
336 [RS_COLUMN_MIMO2_SGI] = {
337 .mode = RS_MIMO2,
338 .ant = ANT_AB,
339 .sgi = true,
340 .next_columns = {
341 RS_COLUMN_SISO_ANT_A_SGI,
342 RS_COLUMN_MIMO2,
343 RS_COLUMN_LEGACY_ANT_A,
344 RS_COLUMN_LEGACY_ANT_B,
345 RS_COLUMN_INVALID,
346 RS_COLUMN_INVALID,
347 RS_COLUMN_INVALID,
348 },
349 .checks = {
350 rs_mimo_allow,
351 rs_sgi_allow,
352 },
353 },
354 };
355
356 static inline u8 rs_extract_rate(u32 rate_n_flags)
357 {
358 /* also works for HT because bits 7:6 are zero there */
359 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
360 }
361
362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
363 {
364 int idx = 0;
365
366 if (rate_n_flags & RATE_MCS_HT_MSK) {
367 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
368 idx += IWL_RATE_MCS_0_INDEX;
369
370 /* skip 9M not supported in HT*/
371 if (idx >= IWL_RATE_9M_INDEX)
372 idx += 1;
373 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
374 return idx;
375 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
376 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
377 idx += IWL_RATE_MCS_0_INDEX;
378
379 /* skip 9M not supported in VHT*/
380 if (idx >= IWL_RATE_9M_INDEX)
381 idx++;
382 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
383 return idx;
384 } else {
385 /* legacy rate format, search for match in table */
386
387 u8 legacy_rate = rs_extract_rate(rate_n_flags);
388 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
389 if (iwl_rates[idx].plcp == legacy_rate)
390 return idx;
391 }
392
393 return IWL_RATE_INVALID;
394 }
395
396 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
397 struct ieee80211_sta *sta,
398 struct iwl_lq_sta *lq_sta,
399 int tid, bool ndp);
400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
401 struct ieee80211_sta *sta,
402 struct iwl_lq_sta *lq_sta,
403 const struct rs_rate *initial_rate);
404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
405
406 /**
407 * The following tables contain the expected throughput metrics for all rates
408 *
409 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
410 *
411 * where invalid entries are zeros.
412 *
413 * CCK rates are only valid in legacy table and will only be used in G
414 * (2.4 GHz) band.
415 */
416
417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
418 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
419 };
420
421 /* Expected TpT tables. 4 indexes:
422 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
423 */
424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
425 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
426 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
427 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
428 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
429 };
430
431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
432 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
433 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
434 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
435 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
436 };
437
438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
439 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
440 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
441 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
442 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
443 };
444
445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
446 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
447 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
448 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
449 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
450 };
451
452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
453 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
454 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
455 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
456 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
457 };
458
459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
460 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
461 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
462 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
463 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
464 };
465
466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
467 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
468 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
469 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
470 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
471 };
472
473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
474 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
475 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
476 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
477 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
478 };
479
480 /* mbps, mcs */
481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
482 { "1", "BPSK DSSS"},
483 { "2", "QPSK DSSS"},
484 {"5.5", "BPSK CCK"},
485 { "11", "QPSK CCK"},
486 { "6", "BPSK 1/2"},
487 { "9", "BPSK 1/2"},
488 { "12", "QPSK 1/2"},
489 { "18", "QPSK 3/4"},
490 { "24", "16QAM 1/2"},
491 { "36", "16QAM 3/4"},
492 { "48", "64QAM 2/3"},
493 { "54", "64QAM 3/4"},
494 { "60", "64QAM 5/6"},
495 };
496
497 #define MCS_INDEX_PER_STREAM (8)
498
499 static const char *rs_pretty_ant(u8 ant)
500 {
501 static const char * const ant_name[] = {
502 [ANT_NONE] = "None",
503 [ANT_A] = "A",
504 [ANT_B] = "B",
505 [ANT_AB] = "AB",
506 [ANT_C] = "C",
507 [ANT_AC] = "AC",
508 [ANT_BC] = "BC",
509 [ANT_ABC] = "ABC",
510 };
511
512 if (ant > ANT_ABC)
513 return "UNKNOWN";
514
515 return ant_name[ant];
516 }
517
518 static const char *rs_pretty_lq_type(enum iwl_table_type type)
519 {
520 static const char * const lq_types[] = {
521 [LQ_NONE] = "NONE",
522 [LQ_LEGACY_A] = "LEGACY_A",
523 [LQ_LEGACY_G] = "LEGACY_G",
524 [LQ_HT_SISO] = "HT SISO",
525 [LQ_HT_MIMO2] = "HT MIMO",
526 [LQ_VHT_SISO] = "VHT SISO",
527 [LQ_VHT_MIMO2] = "VHT MIMO",
528 };
529
530 if (type < LQ_NONE || type >= LQ_MAX)
531 return "UNKNOWN";
532
533 return lq_types[type];
534 }
535
536 static char *rs_pretty_rate(const struct rs_rate *rate)
537 {
538 static char buf[40];
539 static const char * const legacy_rates[] = {
540 [IWL_RATE_1M_INDEX] = "1M",
541 [IWL_RATE_2M_INDEX] = "2M",
542 [IWL_RATE_5M_INDEX] = "5.5M",
543 [IWL_RATE_11M_INDEX] = "11M",
544 [IWL_RATE_6M_INDEX] = "6M",
545 [IWL_RATE_9M_INDEX] = "9M",
546 [IWL_RATE_12M_INDEX] = "12M",
547 [IWL_RATE_18M_INDEX] = "18M",
548 [IWL_RATE_24M_INDEX] = "24M",
549 [IWL_RATE_36M_INDEX] = "36M",
550 [IWL_RATE_48M_INDEX] = "48M",
551 [IWL_RATE_54M_INDEX] = "54M",
552 };
553 static const char *const ht_vht_rates[] = {
554 [IWL_RATE_MCS_0_INDEX] = "MCS0",
555 [IWL_RATE_MCS_1_INDEX] = "MCS1",
556 [IWL_RATE_MCS_2_INDEX] = "MCS2",
557 [IWL_RATE_MCS_3_INDEX] = "MCS3",
558 [IWL_RATE_MCS_4_INDEX] = "MCS4",
559 [IWL_RATE_MCS_5_INDEX] = "MCS5",
560 [IWL_RATE_MCS_6_INDEX] = "MCS6",
561 [IWL_RATE_MCS_7_INDEX] = "MCS7",
562 [IWL_RATE_MCS_8_INDEX] = "MCS8",
563 [IWL_RATE_MCS_9_INDEX] = "MCS9",
564 };
565 const char *rate_str;
566
567 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
568 rate_str = legacy_rates[rate->index];
569 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
570 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
571 (rate->index <= IWL_RATE_MCS_9_INDEX))
572 rate_str = ht_vht_rates[rate->index];
573 else
574 rate_str = "BAD_RATE";
575
576 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
577 rs_pretty_ant(rate->ant), rate_str);
578 return buf;
579 }
580
581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
582 const char *prefix)
583 {
584 IWL_DEBUG_RATE(mvm,
585 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
586 prefix, rs_pretty_rate(rate), rate->bw,
587 rate->sgi, rate->ldpc, rate->stbc);
588 }
589
590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
591 {
592 window->data = 0;
593 window->success_counter = 0;
594 window->success_ratio = IWL_INVALID_VALUE;
595 window->counter = 0;
596 window->average_tpt = IWL_INVALID_VALUE;
597 }
598
599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
600 struct iwl_scale_tbl_info *tbl)
601 {
602 int i;
603
604 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
605 for (i = 0; i < IWL_RATE_COUNT; i++)
606 rs_rate_scale_clear_window(&tbl->win[i]);
607
608 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
609 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
610 }
611
612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
613 {
614 return (ant_type & valid_antenna) == ant_type;
615 }
616
617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
618 struct iwl_lq_sta *lq_data, u8 tid,
619 struct ieee80211_sta *sta)
620 {
621 int ret = -EAGAIN;
622
623 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
624 sta->addr, tid);
625 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
626 if (ret == -EAGAIN) {
627 /*
628 * driver and mac80211 is out of sync
629 * this might be cause by reloading firmware
630 * stop the tx ba session here
631 */
632 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
633 tid);
634 ieee80211_stop_tx_ba_session(sta, tid);
635 }
636 return ret;
637 }
638
639 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
640 struct iwl_lq_sta *lq_data,
641 struct ieee80211_sta *sta)
642 {
643 if (tid < IWL_MAX_TID_COUNT)
644 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
645 else
646 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
647 tid, IWL_MAX_TID_COUNT);
648 }
649
650 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
651 {
652 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
653 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
654 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
655 }
656
657 /*
658 * Static function to get the expected throughput from an iwl_scale_tbl_info
659 * that wraps a NULL pointer check
660 */
661 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
662 {
663 if (tbl->expected_tpt)
664 return tbl->expected_tpt[rs_index];
665 return 0;
666 }
667
668 /**
669 * rs_collect_tx_data - Update the success/failure sliding window
670 *
671 * We keep a sliding window of the last 62 packets transmitted
672 * at this rate. window->data contains the bitmask of successful
673 * packets.
674 */
675 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
676 struct iwl_scale_tbl_info *tbl,
677 int scale_index, int attempts, int successes,
678 struct iwl_rate_scale_data *window)
679 {
680 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
681 s32 fail_count, tpt;
682
683 /* Get expected throughput */
684 tpt = get_expected_tpt(tbl, scale_index);
685
686 /*
687 * Keep track of only the latest 62 tx frame attempts in this rate's
688 * history window; anything older isn't really relevant any more.
689 * If we have filled up the sliding window, drop the oldest attempt;
690 * if the oldest attempt (highest bit in bitmap) shows "success",
691 * subtract "1" from the success counter (this is the main reason
692 * we keep these bitmaps!).
693 */
694 while (attempts > 0) {
695 if (window->counter >= IWL_RATE_MAX_WINDOW) {
696 /* remove earliest */
697 window->counter = IWL_RATE_MAX_WINDOW - 1;
698
699 if (window->data & mask) {
700 window->data &= ~mask;
701 window->success_counter--;
702 }
703 }
704
705 /* Increment frames-attempted counter */
706 window->counter++;
707
708 /* Shift bitmap by one frame to throw away oldest history */
709 window->data <<= 1;
710
711 /* Mark the most recent #successes attempts as successful */
712 if (successes > 0) {
713 window->success_counter++;
714 window->data |= 0x1;
715 successes--;
716 }
717
718 attempts--;
719 }
720
721 /* Calculate current success ratio, avoid divide-by-0! */
722 if (window->counter > 0)
723 window->success_ratio = 128 * (100 * window->success_counter)
724 / window->counter;
725 else
726 window->success_ratio = IWL_INVALID_VALUE;
727
728 fail_count = window->counter - window->success_counter;
729
730 /* Calculate average throughput, if we have enough history. */
731 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
732 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
733 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
734 else
735 window->average_tpt = IWL_INVALID_VALUE;
736
737 return 0;
738 }
739
740 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
741 struct iwl_lq_sta *lq_sta,
742 struct iwl_scale_tbl_info *tbl,
743 int scale_index, int attempts, int successes,
744 u8 reduced_txp)
745 {
746 struct iwl_rate_scale_data *window = NULL;
747
748 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
749 return -EINVAL;
750
751 window = &tbl->tpc_win[reduced_txp];
752 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
753 window);
754 }
755
756 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
757 struct iwl_lq_sta *lq_sta,
758 struct iwl_scale_tbl_info *tbl,
759 int scale_index, int attempts, int successes)
760 {
761 struct iwl_rate_scale_data *window = NULL;
762
763 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
764 return -EINVAL;
765
766 if (tbl->column != RS_COLUMN_INVALID) {
767 struct lq_sta_pers *pers = &lq_sta->pers;
768
769 pers->tx_stats[tbl->column][scale_index].total += attempts;
770 pers->tx_stats[tbl->column][scale_index].success += successes;
771 }
772
773 /* Select window for current tx bit rate */
774 window = &(tbl->win[scale_index]);
775 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
776 window);
777 }
778
779 /* Convert rs_rate object into ucode rate bitmask */
780 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
781 struct rs_rate *rate)
782 {
783 u32 ucode_rate = 0;
784 int index = rate->index;
785
786 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
787 RATE_MCS_ANT_ABC_MSK);
788
789 if (is_legacy(rate)) {
790 ucode_rate |= iwl_rates[index].plcp;
791 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
792 ucode_rate |= RATE_MCS_CCK_MSK;
793 return ucode_rate;
794 }
795
796 if (is_ht(rate)) {
797 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
798 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
799 index = IWL_LAST_HT_RATE;
800 }
801 ucode_rate |= RATE_MCS_HT_MSK;
802
803 if (is_ht_siso(rate))
804 ucode_rate |= iwl_rates[index].plcp_ht_siso;
805 else if (is_ht_mimo2(rate))
806 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
807 else
808 WARN_ON_ONCE(1);
809 } else if (is_vht(rate)) {
810 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
811 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
812 index = IWL_LAST_VHT_RATE;
813 }
814 ucode_rate |= RATE_MCS_VHT_MSK;
815 if (is_vht_siso(rate))
816 ucode_rate |= iwl_rates[index].plcp_vht_siso;
817 else if (is_vht_mimo2(rate))
818 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
819 else
820 WARN_ON_ONCE(1);
821
822 } else {
823 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
824 }
825
826 if (is_siso(rate) && rate->stbc) {
827 /* To enable STBC we need to set both a flag and ANT_AB */
828 ucode_rate |= RATE_MCS_ANT_AB_MSK;
829 ucode_rate |= RATE_MCS_STBC_MSK;
830 }
831
832 ucode_rate |= rate->bw;
833 if (rate->sgi)
834 ucode_rate |= RATE_MCS_SGI_MSK;
835 if (rate->ldpc)
836 ucode_rate |= RATE_MCS_LDPC_MSK;
837
838 return ucode_rate;
839 }
840
841 /* Convert a ucode rate into an rs_rate object */
842 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
843 enum nl80211_band band,
844 struct rs_rate *rate)
845 {
846 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
847 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
848 u8 nss;
849
850 memset(rate, 0, sizeof(*rate));
851 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
852
853 if (rate->index == IWL_RATE_INVALID)
854 return -EINVAL;
855
856 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
857
858 /* Legacy */
859 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
860 !(ucode_rate & RATE_MCS_VHT_MSK)) {
861 if (num_of_ant == 1) {
862 if (band == NL80211_BAND_5GHZ)
863 rate->type = LQ_LEGACY_A;
864 else
865 rate->type = LQ_LEGACY_G;
866 }
867
868 return 0;
869 }
870
871 /* HT or VHT */
872 if (ucode_rate & RATE_MCS_SGI_MSK)
873 rate->sgi = true;
874 if (ucode_rate & RATE_MCS_LDPC_MSK)
875 rate->ldpc = true;
876 if (ucode_rate & RATE_MCS_STBC_MSK)
877 rate->stbc = true;
878 if (ucode_rate & RATE_MCS_BF_MSK)
879 rate->bfer = true;
880
881 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
882
883 if (ucode_rate & RATE_MCS_HT_MSK) {
884 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
885 RATE_HT_MCS_NSS_POS) + 1;
886
887 if (nss == 1) {
888 rate->type = LQ_HT_SISO;
889 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
890 "stbc %d bfer %d",
891 rate->stbc, rate->bfer);
892 } else if (nss == 2) {
893 rate->type = LQ_HT_MIMO2;
894 WARN_ON_ONCE(num_of_ant != 2);
895 } else {
896 WARN_ON_ONCE(1);
897 }
898 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
899 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
900 RATE_VHT_MCS_NSS_POS) + 1;
901
902 if (nss == 1) {
903 rate->type = LQ_VHT_SISO;
904 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
905 "stbc %d bfer %d",
906 rate->stbc, rate->bfer);
907 } else if (nss == 2) {
908 rate->type = LQ_VHT_MIMO2;
909 WARN_ON_ONCE(num_of_ant != 2);
910 } else {
911 WARN_ON_ONCE(1);
912 }
913 }
914
915 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
916 !is_vht(rate));
917
918 return 0;
919 }
920
921 /* switch to another antenna/antennas and return 1 */
922 /* if no other valid antenna found, return 0 */
923 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
924 {
925 u8 new_ant_type;
926
927 if (!rate->ant || rate->ant > ANT_ABC)
928 return 0;
929
930 if (!rs_is_valid_ant(valid_ant, rate->ant))
931 return 0;
932
933 new_ant_type = ant_toggle_lookup[rate->ant];
934
935 while ((new_ant_type != rate->ant) &&
936 !rs_is_valid_ant(valid_ant, new_ant_type))
937 new_ant_type = ant_toggle_lookup[new_ant_type];
938
939 if (new_ant_type == rate->ant)
940 return 0;
941
942 rate->ant = new_ant_type;
943
944 return 1;
945 }
946
947 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
948 struct rs_rate *rate)
949 {
950 if (is_legacy(rate))
951 return lq_sta->active_legacy_rate;
952 else if (is_siso(rate))
953 return lq_sta->active_siso_rate;
954 else if (is_mimo2(rate))
955 return lq_sta->active_mimo2_rate;
956
957 WARN_ON_ONCE(1);
958 return 0;
959 }
960
961 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
962 int rate_type)
963 {
964 u8 high = IWL_RATE_INVALID;
965 u8 low = IWL_RATE_INVALID;
966
967 /* 802.11A or ht walks to the next literal adjacent rate in
968 * the rate table */
969 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
970 int i;
971 u32 mask;
972
973 /* Find the previous rate that is in the rate mask */
974 i = index - 1;
975 if (i >= 0)
976 mask = BIT(i);
977 for (; i >= 0; i--, mask >>= 1) {
978 if (rate_mask & mask) {
979 low = i;
980 break;
981 }
982 }
983
984 /* Find the next rate that is in the rate mask */
985 i = index + 1;
986 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
987 if (rate_mask & mask) {
988 high = i;
989 break;
990 }
991 }
992
993 return (high << 8) | low;
994 }
995
996 low = index;
997 while (low != IWL_RATE_INVALID) {
998 low = iwl_rates[low].prev_rs;
999 if (low == IWL_RATE_INVALID)
1000 break;
1001 if (rate_mask & (1 << low))
1002 break;
1003 }
1004
1005 high = index;
1006 while (high != IWL_RATE_INVALID) {
1007 high = iwl_rates[high].next_rs;
1008 if (high == IWL_RATE_INVALID)
1009 break;
1010 if (rate_mask & (1 << high))
1011 break;
1012 }
1013
1014 return (high << 8) | low;
1015 }
1016
1017 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1018 struct rs_rate *rate)
1019 {
1020 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1021 }
1022
1023 /* Get the next supported lower rate in the current column.
1024 * Return true if bottom rate in the current column was reached
1025 */
1026 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1027 struct rs_rate *rate)
1028 {
1029 u8 low;
1030 u16 high_low;
1031 u16 rate_mask;
1032 struct iwl_mvm *mvm = lq_sta->pers.drv;
1033
1034 rate_mask = rs_get_supported_rates(lq_sta, rate);
1035 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1036 rate->type);
1037 low = high_low & 0xff;
1038
1039 /* Bottom rate of column reached */
1040 if (low == IWL_RATE_INVALID)
1041 return true;
1042
1043 rate->index = low;
1044 return false;
1045 }
1046
1047 /* Get the next rate to use following a column downgrade */
1048 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1049 struct rs_rate *rate)
1050 {
1051 struct iwl_mvm *mvm = lq_sta->pers.drv;
1052
1053 if (is_legacy(rate)) {
1054 /* No column to downgrade from Legacy */
1055 return;
1056 } else if (is_siso(rate)) {
1057 /* Downgrade to Legacy if we were in SISO */
1058 if (lq_sta->band == NL80211_BAND_5GHZ)
1059 rate->type = LQ_LEGACY_A;
1060 else
1061 rate->type = LQ_LEGACY_G;
1062
1063 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1064
1065 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1066 rate->index > IWL_RATE_MCS_9_INDEX);
1067
1068 rate->index = rs_ht_to_legacy[rate->index];
1069 rate->ldpc = false;
1070 } else {
1071 /* Downgrade to SISO with same MCS if in MIMO */
1072 rate->type = is_vht_mimo2(rate) ?
1073 LQ_VHT_SISO : LQ_HT_SISO;
1074 }
1075
1076 if (num_of_ant(rate->ant) > 1)
1077 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1078
1079 /* Relevant in both switching to SISO or Legacy */
1080 rate->sgi = false;
1081
1082 if (!rs_rate_supported(lq_sta, rate))
1083 rs_get_lower_rate_in_column(lq_sta, rate);
1084 }
1085
1086 /* Check if both rates share the same column */
1087 static inline bool rs_rate_column_match(struct rs_rate *a,
1088 struct rs_rate *b)
1089 {
1090 bool ant_match;
1091
1092 if (a->stbc || a->bfer)
1093 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1094 else
1095 ant_match = (a->ant == b->ant);
1096
1097 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1098 && ant_match;
1099 }
1100
1101 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1102 {
1103 if (is_legacy(rate)) {
1104 if (rate->ant == ANT_A)
1105 return RS_COLUMN_LEGACY_ANT_A;
1106
1107 if (rate->ant == ANT_B)
1108 return RS_COLUMN_LEGACY_ANT_B;
1109
1110 goto err;
1111 }
1112
1113 if (is_siso(rate)) {
1114 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1115 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1116 RS_COLUMN_SISO_ANT_A;
1117
1118 if (rate->ant == ANT_B)
1119 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1120 RS_COLUMN_SISO_ANT_B;
1121
1122 goto err;
1123 }
1124
1125 if (is_mimo(rate))
1126 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1127
1128 err:
1129 return RS_COLUMN_INVALID;
1130 }
1131
1132 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1133 {
1134 u8 tid = IWL_MAX_TID_COUNT;
1135
1136 if (ieee80211_is_data_qos(hdr->frame_control)) {
1137 u8 *qc = ieee80211_get_qos_ctl(hdr);
1138 tid = qc[0] & 0xf;
1139 }
1140
1141 if (unlikely(tid > IWL_MAX_TID_COUNT))
1142 tid = IWL_MAX_TID_COUNT;
1143
1144 return tid;
1145 }
1146
1147 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1148 int tid, struct ieee80211_tx_info *info, bool ndp)
1149 {
1150 int legacy_success;
1151 int retries;
1152 int i;
1153 struct iwl_lq_cmd *table;
1154 u32 lq_hwrate;
1155 struct rs_rate lq_rate, tx_resp_rate;
1156 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1157 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1158 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1159 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1160 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1161 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1162 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1163
1164 /* Treat uninitialized rate scaling data same as non-existing. */
1165 if (!lq_sta) {
1166 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1167 return;
1168 } else if (!lq_sta->pers.drv) {
1169 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1170 return;
1171 }
1172
1173 /* This packet was aggregated but doesn't carry status info */
1174 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1175 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1176 return;
1177
1178 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1179
1180 #ifdef CONFIG_MAC80211_DEBUGFS
1181 /* Disable last tx check if we are debugging with fixed rate but
1182 * update tx stats */
1183 if (lq_sta->pers.dbg_fixed_rate) {
1184 int index = tx_resp_rate.index;
1185 enum rs_column column;
1186 int attempts, success;
1187
1188 column = rs_get_column_from_rate(&tx_resp_rate);
1189 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1190 "Can't map rate 0x%x to column",
1191 tx_resp_hwrate))
1192 return;
1193
1194 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1195 attempts = info->status.ampdu_len;
1196 success = info->status.ampdu_ack_len;
1197 } else {
1198 attempts = info->status.rates[0].count;
1199 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1200 }
1201
1202 lq_sta->pers.tx_stats[column][index].total += attempts;
1203 lq_sta->pers.tx_stats[column][index].success += success;
1204
1205 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1206 tx_resp_hwrate, success, attempts);
1207 return;
1208 }
1209 #endif
1210
1211 if (time_after(jiffies,
1212 (unsigned long)(lq_sta->last_tx +
1213 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1214 int t;
1215
1216 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1217 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1218 ieee80211_stop_tx_ba_session(sta, t);
1219
1220 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1221 return;
1222 }
1223 lq_sta->last_tx = jiffies;
1224
1225 /* Ignore this Tx frame response if its initial rate doesn't match
1226 * that of latest Link Quality command. There may be stragglers
1227 * from a previous Link Quality command, but we're no longer interested
1228 * in those; they're either from the "active" mode while we're trying
1229 * to check "search" mode, or a prior "search" mode after we've moved
1230 * to a new "search" mode (which might become the new "active" mode).
1231 */
1232 table = &lq_sta->lq;
1233 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1234 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1235
1236 /* Here we actually compare this rate to the latest LQ command */
1237 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1238 IWL_DEBUG_RATE(mvm,
1239 "tx resp color 0x%x does not match 0x%x\n",
1240 lq_color, LQ_FLAG_COLOR_GET(table->flags));
1241
1242 /*
1243 * Since rates mis-match, the last LQ command may have failed.
1244 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1245 * ... driver.
1246 */
1247 lq_sta->missed_rate_counter++;
1248 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1249 lq_sta->missed_rate_counter = 0;
1250 IWL_DEBUG_RATE(mvm,
1251 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1252 lq_sta->rs_state);
1253 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1254 }
1255 /* Regardless, ignore this status info for outdated rate */
1256 return;
1257 } else
1258 /* Rate did match, so reset the missed_rate_counter */
1259 lq_sta->missed_rate_counter = 0;
1260
1261 if (!lq_sta->search_better_tbl) {
1262 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1263 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1264 } else {
1265 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1266 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1267 }
1268
1269 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1270 IWL_DEBUG_RATE(mvm,
1271 "Neither active nor search matches tx rate\n");
1272 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1273 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1274 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1275 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1276 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1277
1278 /*
1279 * no matching table found, let's by-pass the data collection
1280 * and continue to perform rate scale to find the rate table
1281 */
1282 rs_stay_in_table(lq_sta, true);
1283 goto done;
1284 }
1285
1286 /*
1287 * Updating the frame history depends on whether packets were
1288 * aggregated.
1289 *
1290 * For aggregation, all packets were transmitted at the same rate, the
1291 * first index into rate scale table.
1292 */
1293 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1294 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1295 info->status.ampdu_len,
1296 info->status.ampdu_ack_len,
1297 reduced_txp);
1298
1299 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1300 * it as a single frame loss as we don't want the success ratio
1301 * to dip too quickly because a BA wasn't received.
1302 * For TPC, there's no need for this optimisation since we want
1303 * to recover very quickly from a bad power reduction and,
1304 * therefore we'd like the success ratio to get an immediate hit
1305 * when failing to get a BA, so we'd switch back to a lower or
1306 * zero power reduction. When FW transmits agg with a rate
1307 * different from the initial rate, it will not use reduced txp
1308 * and will send BA notification twice (one empty with reduced
1309 * txp equal to the value from LQ and one with reduced txp 0).
1310 * We need to update counters for each txp level accordingly.
1311 */
1312 if (info->status.ampdu_ack_len == 0)
1313 info->status.ampdu_len = 1;
1314
1315 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1316 info->status.ampdu_len,
1317 info->status.ampdu_ack_len);
1318
1319 /* Update success/fail counts if not searching for new mode */
1320 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1321 lq_sta->total_success += info->status.ampdu_ack_len;
1322 lq_sta->total_failed += (info->status.ampdu_len -
1323 info->status.ampdu_ack_len);
1324 }
1325 } else {
1326 /* For legacy, update frame history with for each Tx retry. */
1327 retries = info->status.rates[0].count - 1;
1328 /* HW doesn't send more than 15 retries */
1329 retries = min(retries, 15);
1330
1331 /* The last transmission may have been successful */
1332 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1333 /* Collect data for each rate used during failed TX attempts */
1334 for (i = 0; i <= retries; ++i) {
1335 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1336 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1337 &lq_rate);
1338 /*
1339 * Only collect stats if retried rate is in the same RS
1340 * table as active/search.
1341 */
1342 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1343 tmp_tbl = curr_tbl;
1344 else if (rs_rate_column_match(&lq_rate,
1345 &other_tbl->rate))
1346 tmp_tbl = other_tbl;
1347 else
1348 continue;
1349
1350 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1351 tx_resp_rate.index, 1,
1352 i < retries ? 0 : legacy_success,
1353 reduced_txp);
1354 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1355 tx_resp_rate.index, 1,
1356 i < retries ? 0 : legacy_success);
1357 }
1358
1359 /* Update success/fail counts if not searching for new mode */
1360 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1361 lq_sta->total_success += legacy_success;
1362 lq_sta->total_failed += retries + (1 - legacy_success);
1363 }
1364 }
1365 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1366 lq_sta->last_rate_n_flags = lq_hwrate;
1367 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1368 done:
1369 /* See if there's a better rate or modulation mode to try. */
1370 if (sta->supp_rates[info->band])
1371 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1372 }
1373
1374 /*
1375 * mac80211 sends us Tx status
1376 */
1377 static void rs_mac80211_tx_status(void *mvm_r,
1378 struct ieee80211_supported_band *sband,
1379 struct ieee80211_sta *sta, void *priv_sta,
1380 struct sk_buff *skb)
1381 {
1382 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1383 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1384 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1385 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1386
1387 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1388 return;
1389
1390 if (!ieee80211_is_data(hdr->frame_control) ||
1391 info->flags & IEEE80211_TX_CTL_NO_ACK)
1392 return;
1393
1394 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1395 ieee80211_is_qos_nullfunc(hdr->frame_control));
1396 }
1397
1398 /*
1399 * Begin a period of staying with a selected modulation mode.
1400 * Set "stay_in_tbl" flag to prevent any mode switches.
1401 * Set frame tx success limits according to legacy vs. high-throughput,
1402 * and reset overall (spanning all rates) tx success history statistics.
1403 * These control how long we stay using same modulation mode before
1404 * searching for a new mode.
1405 */
1406 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1407 struct iwl_lq_sta *lq_sta)
1408 {
1409 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1410 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1411 if (is_legacy) {
1412 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1413 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1414 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1415 } else {
1416 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1417 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1418 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1419 }
1420 lq_sta->table_count = 0;
1421 lq_sta->total_failed = 0;
1422 lq_sta->total_success = 0;
1423 lq_sta->flush_timer = jiffies;
1424 lq_sta->visited_columns = 0;
1425 }
1426
1427 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1428 {
1429 if (rate_mask)
1430 return find_last_bit(&rate_mask, BITS_PER_LONG);
1431 return IWL_RATE_INVALID;
1432 }
1433
1434 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1435 const struct rs_tx_column *column)
1436 {
1437 switch (column->mode) {
1438 case RS_LEGACY:
1439 return lq_sta->max_legacy_rate_idx;
1440 case RS_SISO:
1441 return lq_sta->max_siso_rate_idx;
1442 case RS_MIMO2:
1443 return lq_sta->max_mimo2_rate_idx;
1444 default:
1445 WARN_ON_ONCE(1);
1446 }
1447
1448 return lq_sta->max_legacy_rate_idx;
1449 }
1450
1451 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1452 const struct rs_tx_column *column,
1453 u32 bw)
1454 {
1455 /* Used to choose among HT tables */
1456 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1457
1458 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1459 column->mode != RS_SISO &&
1460 column->mode != RS_MIMO2))
1461 return expected_tpt_legacy;
1462
1463 /* Legacy rates have only one table */
1464 if (column->mode == RS_LEGACY)
1465 return expected_tpt_legacy;
1466
1467 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1468 /* Choose among many HT tables depending on number of streams
1469 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1470 * status */
1471 if (column->mode == RS_SISO) {
1472 switch (bw) {
1473 case RATE_MCS_CHAN_WIDTH_20:
1474 ht_tbl_pointer = expected_tpt_siso_20MHz;
1475 break;
1476 case RATE_MCS_CHAN_WIDTH_40:
1477 ht_tbl_pointer = expected_tpt_siso_40MHz;
1478 break;
1479 case RATE_MCS_CHAN_WIDTH_80:
1480 ht_tbl_pointer = expected_tpt_siso_80MHz;
1481 break;
1482 case RATE_MCS_CHAN_WIDTH_160:
1483 ht_tbl_pointer = expected_tpt_siso_160MHz;
1484 break;
1485 default:
1486 WARN_ON_ONCE(1);
1487 }
1488 } else if (column->mode == RS_MIMO2) {
1489 switch (bw) {
1490 case RATE_MCS_CHAN_WIDTH_20:
1491 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1492 break;
1493 case RATE_MCS_CHAN_WIDTH_40:
1494 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1495 break;
1496 case RATE_MCS_CHAN_WIDTH_80:
1497 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1498 break;
1499 case RATE_MCS_CHAN_WIDTH_160:
1500 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1501 break;
1502 default:
1503 WARN_ON_ONCE(1);
1504 }
1505 } else {
1506 WARN_ON_ONCE(1);
1507 }
1508
1509 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1510 return ht_tbl_pointer[0];
1511 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1512 return ht_tbl_pointer[1];
1513 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1514 return ht_tbl_pointer[2];
1515 else /* AGG+SGI */
1516 return ht_tbl_pointer[3];
1517 }
1518
1519 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1520 struct iwl_scale_tbl_info *tbl)
1521 {
1522 struct rs_rate *rate = &tbl->rate;
1523 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1524
1525 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1526 }
1527
1528 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1529 struct iwl_lq_sta *lq_sta,
1530 struct iwl_scale_tbl_info *tbl, /* "search" */
1531 unsigned long rate_mask, s8 index)
1532 {
1533 struct iwl_scale_tbl_info *active_tbl =
1534 &(lq_sta->lq_info[lq_sta->active_tbl]);
1535 s32 success_ratio = active_tbl->win[index].success_ratio;
1536 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1537 const u16 *tpt_tbl = tbl->expected_tpt;
1538 u16 high_low;
1539 u32 target_tpt;
1540 int rate_idx;
1541
1542 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1543 target_tpt = 100 * expected_current_tpt;
1544 IWL_DEBUG_RATE(mvm,
1545 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1546 success_ratio, target_tpt);
1547 } else {
1548 target_tpt = lq_sta->last_tpt;
1549 IWL_DEBUG_RATE(mvm,
1550 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1551 success_ratio, target_tpt);
1552 }
1553
1554 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1555
1556 while (rate_idx != IWL_RATE_INVALID) {
1557 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1558 break;
1559
1560 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1561 tbl->rate.type);
1562
1563 rate_idx = (high_low >> 8) & 0xff;
1564 }
1565
1566 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1567 rate_idx, target_tpt,
1568 rate_idx != IWL_RATE_INVALID ?
1569 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1570
1571 return rate_idx;
1572 }
1573
1574 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1575 {
1576 switch (sta->bandwidth) {
1577 case IEEE80211_STA_RX_BW_160:
1578 return RATE_MCS_CHAN_WIDTH_160;
1579 case IEEE80211_STA_RX_BW_80:
1580 return RATE_MCS_CHAN_WIDTH_80;
1581 case IEEE80211_STA_RX_BW_40:
1582 return RATE_MCS_CHAN_WIDTH_40;
1583 case IEEE80211_STA_RX_BW_20:
1584 default:
1585 return RATE_MCS_CHAN_WIDTH_20;
1586 }
1587 }
1588
1589 /*
1590 * Check whether we should continue using same modulation mode, or
1591 * begin search for a new mode, based on:
1592 * 1) # tx successes or failures while using this mode
1593 * 2) # times calling this function
1594 * 3) elapsed time in this mode (not used, for now)
1595 */
1596 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1597 {
1598 struct iwl_scale_tbl_info *tbl;
1599 int active_tbl;
1600 int flush_interval_passed = 0;
1601 struct iwl_mvm *mvm;
1602
1603 mvm = lq_sta->pers.drv;
1604 active_tbl = lq_sta->active_tbl;
1605
1606 tbl = &(lq_sta->lq_info[active_tbl]);
1607
1608 /* If we've been disallowing search, see if we should now allow it */
1609 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1610 /* Elapsed time using current modulation mode */
1611 if (lq_sta->flush_timer)
1612 flush_interval_passed =
1613 time_after(jiffies,
1614 (unsigned long)(lq_sta->flush_timer +
1615 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1616
1617 /*
1618 * Check if we should allow search for new modulation mode.
1619 * If many frames have failed or succeeded, or we've used
1620 * this same modulation for a long time, allow search, and
1621 * reset history stats that keep track of whether we should
1622 * allow a new search. Also (below) reset all bitmaps and
1623 * stats in active history.
1624 */
1625 if (force_search ||
1626 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1627 (lq_sta->total_success > lq_sta->max_success_limit) ||
1628 ((!lq_sta->search_better_tbl) &&
1629 (lq_sta->flush_timer) && (flush_interval_passed))) {
1630 IWL_DEBUG_RATE(mvm,
1631 "LQ: stay is expired %d %d %d\n",
1632 lq_sta->total_failed,
1633 lq_sta->total_success,
1634 flush_interval_passed);
1635
1636 /* Allow search for new mode */
1637 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1638 IWL_DEBUG_RATE(mvm,
1639 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1640 lq_sta->total_failed = 0;
1641 lq_sta->total_success = 0;
1642 lq_sta->flush_timer = 0;
1643 /* mark the current column as visited */
1644 lq_sta->visited_columns = BIT(tbl->column);
1645 /*
1646 * Else if we've used this modulation mode enough repetitions
1647 * (regardless of elapsed time or success/failure), reset
1648 * history bitmaps and rate-specific stats for all rates in
1649 * active table.
1650 */
1651 } else {
1652 lq_sta->table_count++;
1653 if (lq_sta->table_count >=
1654 lq_sta->table_count_limit) {
1655 lq_sta->table_count = 0;
1656
1657 IWL_DEBUG_RATE(mvm,
1658 "LQ: stay in table clear win\n");
1659 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1660 }
1661 }
1662
1663 /* If transitioning to allow "search", reset all history
1664 * bitmaps and stats in active table (this will become the new
1665 * "search" table). */
1666 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1667 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1668 }
1669 }
1670 }
1671
1672 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1673 struct iwl_scale_tbl_info *tbl,
1674 enum rs_action scale_action)
1675 {
1676 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1677
1678 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1679 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1680 scale_action == RS_ACTION_DOWNSCALE)
1681 sta_priv->tlc_amsdu = false;
1682 else
1683 sta_priv->tlc_amsdu = true;
1684 }
1685
1686 /*
1687 * setup rate table in uCode
1688 */
1689 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1690 struct ieee80211_sta *sta,
1691 struct iwl_lq_sta *lq_sta,
1692 struct iwl_scale_tbl_info *tbl)
1693 {
1694 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1695 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1696 }
1697
1698 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1699 struct ieee80211_sta *sta,
1700 struct iwl_lq_sta *lq_sta,
1701 struct iwl_scale_tbl_info *tbl,
1702 enum rs_action scale_action)
1703 {
1704 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1705 return false;
1706
1707 if (!is_vht_siso(&tbl->rate))
1708 return false;
1709
1710 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1711 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1712 (scale_action == RS_ACTION_DOWNSCALE)) {
1713 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1714 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1715 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1716 goto tweaked;
1717 }
1718
1719 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1720 * sustainable, i.e. we're past the test window. We can't go back
1721 * if MCS5 is just tested as this will happen always after switching
1722 * to 20Mhz MCS4 because the rate stats are cleared.
1723 */
1724 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1725 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1726 (scale_action == RS_ACTION_STAY)) ||
1727 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1728 (scale_action == RS_ACTION_UPSCALE)))) {
1729 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1730 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1731 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1732 goto tweaked;
1733 }
1734
1735 return false;
1736
1737 tweaked:
1738 rs_set_expected_tpt_table(lq_sta, tbl);
1739 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1740 return true;
1741 }
1742
1743 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1744 struct iwl_lq_sta *lq_sta,
1745 struct ieee80211_sta *sta,
1746 struct iwl_scale_tbl_info *tbl)
1747 {
1748 int i, j, max_rate;
1749 enum rs_column next_col_id;
1750 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1751 const struct rs_tx_column *next_col;
1752 allow_column_func_t allow_func;
1753 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1754 const u16 *expected_tpt_tbl;
1755 u16 tpt, max_expected_tpt;
1756
1757 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1758 next_col_id = curr_col->next_columns[i];
1759
1760 if (next_col_id == RS_COLUMN_INVALID)
1761 continue;
1762
1763 if (lq_sta->visited_columns & BIT(next_col_id)) {
1764 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1765 next_col_id);
1766 continue;
1767 }
1768
1769 next_col = &rs_tx_columns[next_col_id];
1770
1771 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1772 IWL_DEBUG_RATE(mvm,
1773 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1774 next_col_id, valid_ants, next_col->ant);
1775 continue;
1776 }
1777
1778 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1779 allow_func = next_col->checks[j];
1780 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1781 next_col))
1782 break;
1783 }
1784
1785 if (j != MAX_COLUMN_CHECKS) {
1786 IWL_DEBUG_RATE(mvm,
1787 "Skip column %d: not allowed (check %d failed)\n",
1788 next_col_id, j);
1789
1790 continue;
1791 }
1792
1793 tpt = lq_sta->last_tpt / 100;
1794 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1795 rs_bw_from_sta_bw(sta));
1796 if (WARN_ON_ONCE(!expected_tpt_tbl))
1797 continue;
1798
1799 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1800 if (max_rate == IWL_RATE_INVALID) {
1801 IWL_DEBUG_RATE(mvm,
1802 "Skip column %d: no rate is allowed in this column\n",
1803 next_col_id);
1804 continue;
1805 }
1806
1807 max_expected_tpt = expected_tpt_tbl[max_rate];
1808 if (tpt >= max_expected_tpt) {
1809 IWL_DEBUG_RATE(mvm,
1810 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1811 next_col_id, max_expected_tpt, tpt);
1812 continue;
1813 }
1814
1815 IWL_DEBUG_RATE(mvm,
1816 "Found potential column %d. Max expected %d current %d\n",
1817 next_col_id, max_expected_tpt, tpt);
1818 break;
1819 }
1820
1821 if (i == MAX_NEXT_COLUMNS)
1822 return RS_COLUMN_INVALID;
1823
1824 return next_col_id;
1825 }
1826
1827 static int rs_switch_to_column(struct iwl_mvm *mvm,
1828 struct iwl_lq_sta *lq_sta,
1829 struct ieee80211_sta *sta,
1830 enum rs_column col_id)
1831 {
1832 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1833 struct iwl_scale_tbl_info *search_tbl =
1834 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1835 struct rs_rate *rate = &search_tbl->rate;
1836 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1837 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1838 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1839 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1840 unsigned long rate_mask = 0;
1841 u32 rate_idx = 0;
1842
1843 memcpy(search_tbl, tbl, sz);
1844
1845 rate->sgi = column->sgi;
1846 rate->ant = column->ant;
1847
1848 if (column->mode == RS_LEGACY) {
1849 if (lq_sta->band == NL80211_BAND_5GHZ)
1850 rate->type = LQ_LEGACY_A;
1851 else
1852 rate->type = LQ_LEGACY_G;
1853
1854 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1855 rate->ldpc = false;
1856 rate_mask = lq_sta->active_legacy_rate;
1857 } else if (column->mode == RS_SISO) {
1858 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1859 rate_mask = lq_sta->active_siso_rate;
1860 } else if (column->mode == RS_MIMO2) {
1861 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1862 rate_mask = lq_sta->active_mimo2_rate;
1863 } else {
1864 WARN_ONCE(1, "Bad column mode");
1865 }
1866
1867 if (column->mode != RS_LEGACY) {
1868 rate->bw = rs_bw_from_sta_bw(sta);
1869 rate->ldpc = lq_sta->ldpc;
1870 }
1871
1872 search_tbl->column = col_id;
1873 rs_set_expected_tpt_table(lq_sta, search_tbl);
1874
1875 lq_sta->visited_columns |= BIT(col_id);
1876
1877 /* Get the best matching rate if we're changing modes. e.g.
1878 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1879 */
1880 if (curr_column->mode != column->mode) {
1881 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1882 rate_mask, rate->index);
1883
1884 if ((rate_idx == IWL_RATE_INVALID) ||
1885 !(BIT(rate_idx) & rate_mask)) {
1886 IWL_DEBUG_RATE(mvm,
1887 "can not switch with index %d"
1888 " rate mask %lx\n",
1889 rate_idx, rate_mask);
1890
1891 goto err;
1892 }
1893
1894 rate->index = rate_idx;
1895 }
1896
1897 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1898 col_id, rate->index);
1899
1900 return 0;
1901
1902 err:
1903 rate->type = LQ_NONE;
1904 return -1;
1905 }
1906
1907 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1908 struct iwl_scale_tbl_info *tbl,
1909 s32 sr, int low, int high,
1910 int current_tpt,
1911 int low_tpt, int high_tpt)
1912 {
1913 enum rs_action action = RS_ACTION_STAY;
1914
1915 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1916 (current_tpt == 0)) {
1917 IWL_DEBUG_RATE(mvm,
1918 "Decrease rate because of low SR\n");
1919 return RS_ACTION_DOWNSCALE;
1920 }
1921
1922 if ((low_tpt == IWL_INVALID_VALUE) &&
1923 (high_tpt == IWL_INVALID_VALUE) &&
1924 (high != IWL_RATE_INVALID)) {
1925 IWL_DEBUG_RATE(mvm,
1926 "No data about high/low rates. Increase rate\n");
1927 return RS_ACTION_UPSCALE;
1928 }
1929
1930 if ((high_tpt == IWL_INVALID_VALUE) &&
1931 (high != IWL_RATE_INVALID) &&
1932 (low_tpt != IWL_INVALID_VALUE) &&
1933 (low_tpt < current_tpt)) {
1934 IWL_DEBUG_RATE(mvm,
1935 "No data about high rate and low rate is worse. Increase rate\n");
1936 return RS_ACTION_UPSCALE;
1937 }
1938
1939 if ((high_tpt != IWL_INVALID_VALUE) &&
1940 (high_tpt > current_tpt)) {
1941 IWL_DEBUG_RATE(mvm,
1942 "Higher rate is better. Increate rate\n");
1943 return RS_ACTION_UPSCALE;
1944 }
1945
1946 if ((low_tpt != IWL_INVALID_VALUE) &&
1947 (high_tpt != IWL_INVALID_VALUE) &&
1948 (low_tpt < current_tpt) &&
1949 (high_tpt < current_tpt)) {
1950 IWL_DEBUG_RATE(mvm,
1951 "Both high and low are worse. Maintain rate\n");
1952 return RS_ACTION_STAY;
1953 }
1954
1955 if ((low_tpt != IWL_INVALID_VALUE) &&
1956 (low_tpt > current_tpt)) {
1957 IWL_DEBUG_RATE(mvm,
1958 "Lower rate is better\n");
1959 action = RS_ACTION_DOWNSCALE;
1960 goto out;
1961 }
1962
1963 if ((low_tpt == IWL_INVALID_VALUE) &&
1964 (low != IWL_RATE_INVALID)) {
1965 IWL_DEBUG_RATE(mvm,
1966 "No data about lower rate\n");
1967 action = RS_ACTION_DOWNSCALE;
1968 goto out;
1969 }
1970
1971 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1972
1973 out:
1974 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1975 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1976 IWL_DEBUG_RATE(mvm,
1977 "SR is above NO DECREASE. Avoid downscale\n");
1978 action = RS_ACTION_STAY;
1979 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1980 IWL_DEBUG_RATE(mvm,
1981 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1982 action = RS_ACTION_STAY;
1983 } else {
1984 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1985 }
1986 }
1987
1988 return action;
1989 }
1990
1991 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1992 struct iwl_lq_sta *lq_sta)
1993 {
1994 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1995 * supports STBC of at least 1*SS
1996 */
1997 if (!lq_sta->stbc_capable)
1998 return false;
1999
2000 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2001 return false;
2002
2003 return true;
2004 }
2005
2006 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2007 int *weaker, int *stronger)
2008 {
2009 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2010 if (*weaker > TPC_MAX_REDUCTION)
2011 *weaker = TPC_INVALID;
2012
2013 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2014 if (*stronger < 0)
2015 *stronger = TPC_INVALID;
2016 }
2017
2018 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2019 struct rs_rate *rate, enum nl80211_band band)
2020 {
2021 int index = rate->index;
2022 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2023 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2024 !vif->bss_conf.ps);
2025
2026 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2027 cam, sta_ps_disabled);
2028 /*
2029 * allow tpc only if power management is enabled, or bt coex
2030 * activity grade allows it and we are on 2.4Ghz.
2031 */
2032 if ((cam || sta_ps_disabled) &&
2033 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2034 return false;
2035
2036 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2037 if (is_legacy(rate))
2038 return index == IWL_RATE_54M_INDEX;
2039 if (is_ht(rate))
2040 return index == IWL_RATE_MCS_7_INDEX;
2041 if (is_vht(rate))
2042 return index == IWL_RATE_MCS_7_INDEX ||
2043 index == IWL_RATE_MCS_8_INDEX ||
2044 index == IWL_RATE_MCS_9_INDEX;
2045
2046 WARN_ON_ONCE(1);
2047 return false;
2048 }
2049
2050 enum tpc_action {
2051 TPC_ACTION_STAY,
2052 TPC_ACTION_DECREASE,
2053 TPC_ACTION_INCREASE,
2054 TPC_ACTION_NO_RESTIRCTION,
2055 };
2056
2057 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2058 s32 sr, int weak, int strong,
2059 int current_tpt,
2060 int weak_tpt, int strong_tpt)
2061 {
2062 /* stay until we have valid tpt */
2063 if (current_tpt == IWL_INVALID_VALUE) {
2064 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2065 return TPC_ACTION_STAY;
2066 }
2067
2068 /* Too many failures, increase txp */
2069 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2070 current_tpt == 0) {
2071 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2072 return TPC_ACTION_NO_RESTIRCTION;
2073 }
2074
2075 /* try decreasing first if applicable */
2076 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2077 weak != TPC_INVALID) {
2078 if (weak_tpt == IWL_INVALID_VALUE &&
2079 (strong_tpt == IWL_INVALID_VALUE ||
2080 current_tpt >= strong_tpt)) {
2081 IWL_DEBUG_RATE(mvm,
2082 "no weak txp measurement. decrease txp\n");
2083 return TPC_ACTION_DECREASE;
2084 }
2085
2086 if (weak_tpt > current_tpt) {
2087 IWL_DEBUG_RATE(mvm,
2088 "lower txp has better tpt. decrease txp\n");
2089 return TPC_ACTION_DECREASE;
2090 }
2091 }
2092
2093 /* next, increase if needed */
2094 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2095 strong != TPC_INVALID) {
2096 if (weak_tpt == IWL_INVALID_VALUE &&
2097 strong_tpt != IWL_INVALID_VALUE &&
2098 current_tpt < strong_tpt) {
2099 IWL_DEBUG_RATE(mvm,
2100 "higher txp has better tpt. increase txp\n");
2101 return TPC_ACTION_INCREASE;
2102 }
2103
2104 if (weak_tpt < current_tpt &&
2105 (strong_tpt == IWL_INVALID_VALUE ||
2106 strong_tpt > current_tpt)) {
2107 IWL_DEBUG_RATE(mvm,
2108 "lower txp has worse tpt. increase txp\n");
2109 return TPC_ACTION_INCREASE;
2110 }
2111 }
2112
2113 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2114 return TPC_ACTION_STAY;
2115 }
2116
2117 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2118 struct ieee80211_sta *sta,
2119 struct iwl_lq_sta *lq_sta,
2120 struct iwl_scale_tbl_info *tbl)
2121 {
2122 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2123 struct ieee80211_vif *vif = mvm_sta->vif;
2124 struct ieee80211_chanctx_conf *chanctx_conf;
2125 enum nl80211_band band;
2126 struct iwl_rate_scale_data *window;
2127 struct rs_rate *rate = &tbl->rate;
2128 enum tpc_action action;
2129 s32 sr;
2130 u8 cur = lq_sta->lq.reduced_tpc;
2131 int current_tpt;
2132 int weak, strong;
2133 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2134
2135 #ifdef CONFIG_MAC80211_DEBUGFS
2136 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2137 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2138 lq_sta->pers.dbg_fixed_txp_reduction);
2139 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2140 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2141 }
2142 #endif
2143
2144 rcu_read_lock();
2145 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2146 if (WARN_ON(!chanctx_conf))
2147 band = NUM_NL80211_BANDS;
2148 else
2149 band = chanctx_conf->def.chan->band;
2150 rcu_read_unlock();
2151
2152 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2153 IWL_DEBUG_RATE(mvm,
2154 "tpc is not allowed. remove txp restrictions\n");
2155 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2156 return cur != TPC_NO_REDUCTION;
2157 }
2158
2159 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2160
2161 /* Collect measured throughputs for current and adjacent rates */
2162 window = tbl->tpc_win;
2163 sr = window[cur].success_ratio;
2164 current_tpt = window[cur].average_tpt;
2165 if (weak != TPC_INVALID)
2166 weak_tpt = window[weak].average_tpt;
2167 if (strong != TPC_INVALID)
2168 strong_tpt = window[strong].average_tpt;
2169
2170 IWL_DEBUG_RATE(mvm,
2171 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2172 cur, current_tpt, sr, weak, strong,
2173 weak_tpt, strong_tpt);
2174
2175 action = rs_get_tpc_action(mvm, sr, weak, strong,
2176 current_tpt, weak_tpt, strong_tpt);
2177
2178 /* override actions if we are on the edge */
2179 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2180 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2181 action = TPC_ACTION_STAY;
2182 } else if (strong == TPC_INVALID &&
2183 (action == TPC_ACTION_INCREASE ||
2184 action == TPC_ACTION_NO_RESTIRCTION)) {
2185 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2186 action = TPC_ACTION_STAY;
2187 }
2188
2189 switch (action) {
2190 case TPC_ACTION_DECREASE:
2191 lq_sta->lq.reduced_tpc = weak;
2192 return true;
2193 case TPC_ACTION_INCREASE:
2194 lq_sta->lq.reduced_tpc = strong;
2195 return true;
2196 case TPC_ACTION_NO_RESTIRCTION:
2197 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2198 return true;
2199 case TPC_ACTION_STAY:
2200 /* do nothing */
2201 break;
2202 }
2203 return false;
2204 }
2205
2206 /*
2207 * Do rate scaling and search for new modulation mode.
2208 */
2209 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2210 struct ieee80211_sta *sta,
2211 struct iwl_lq_sta *lq_sta,
2212 int tid, bool ndp)
2213 {
2214 int low = IWL_RATE_INVALID;
2215 int high = IWL_RATE_INVALID;
2216 int index;
2217 struct iwl_rate_scale_data *window = NULL;
2218 int current_tpt = IWL_INVALID_VALUE;
2219 int low_tpt = IWL_INVALID_VALUE;
2220 int high_tpt = IWL_INVALID_VALUE;
2221 u32 fail_count;
2222 enum rs_action scale_action = RS_ACTION_STAY;
2223 u16 rate_mask;
2224 u8 update_lq = 0;
2225 struct iwl_scale_tbl_info *tbl, *tbl1;
2226 u8 active_tbl = 0;
2227 u8 done_search = 0;
2228 u16 high_low;
2229 s32 sr;
2230 u8 prev_agg = lq_sta->is_agg;
2231 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2232 struct iwl_mvm_tid_data *tid_data;
2233 struct rs_rate *rate;
2234
2235 lq_sta->is_agg = !!sta_priv->agg_tids;
2236
2237 /*
2238 * Select rate-scale / modulation-mode table to work with in
2239 * the rest of this function: "search" if searching for better
2240 * modulation mode, or "active" if doing rate scaling within a mode.
2241 */
2242 if (!lq_sta->search_better_tbl)
2243 active_tbl = lq_sta->active_tbl;
2244 else
2245 active_tbl = 1 - lq_sta->active_tbl;
2246
2247 tbl = &(lq_sta->lq_info[active_tbl]);
2248 rate = &tbl->rate;
2249
2250 if (prev_agg != lq_sta->is_agg) {
2251 IWL_DEBUG_RATE(mvm,
2252 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2253 prev_agg, lq_sta->is_agg);
2254 rs_set_expected_tpt_table(lq_sta, tbl);
2255 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2256 }
2257
2258 /* current tx rate */
2259 index = rate->index;
2260
2261 /* rates available for this association, and for modulation mode */
2262 rate_mask = rs_get_supported_rates(lq_sta, rate);
2263
2264 if (!(BIT(index) & rate_mask)) {
2265 IWL_ERR(mvm, "Current Rate is not valid\n");
2266 if (lq_sta->search_better_tbl) {
2267 /* revert to active table if search table is not valid*/
2268 rate->type = LQ_NONE;
2269 lq_sta->search_better_tbl = 0;
2270 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2271 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2272 }
2273 return;
2274 }
2275
2276 /* Get expected throughput table and history window for current rate */
2277 if (!tbl->expected_tpt) {
2278 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2279 return;
2280 }
2281
2282 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2283 window = &(tbl->win[index]);
2284
2285 /*
2286 * If there is not enough history to calculate actual average
2287 * throughput, keep analyzing results of more tx frames, without
2288 * changing rate or mode (bypass most of the rest of this function).
2289 * Set up new rate table in uCode only if old rate is not supported
2290 * in current association (use new rate found above).
2291 */
2292 fail_count = window->counter - window->success_counter;
2293 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2294 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2295 IWL_DEBUG_RATE(mvm,
2296 "%s: Test Window: succ %d total %d\n",
2297 rs_pretty_rate(rate),
2298 window->success_counter, window->counter);
2299
2300 /* Can't calculate this yet; not enough history */
2301 window->average_tpt = IWL_INVALID_VALUE;
2302
2303 /* Should we stay with this modulation mode,
2304 * or search for a new one? */
2305 rs_stay_in_table(lq_sta, false);
2306
2307 return;
2308 }
2309
2310 /* If we are searching for better modulation mode, check success. */
2311 if (lq_sta->search_better_tbl) {
2312 /* If good success, continue using the "search" mode;
2313 * no need to send new link quality command, since we're
2314 * continuing to use the setup that we've been trying. */
2315 if (window->average_tpt > lq_sta->last_tpt) {
2316 IWL_DEBUG_RATE(mvm,
2317 "SWITCHING TO NEW TABLE SR: %d "
2318 "cur-tpt %d old-tpt %d\n",
2319 window->success_ratio,
2320 window->average_tpt,
2321 lq_sta->last_tpt);
2322
2323 /* Swap tables; "search" becomes "active" */
2324 lq_sta->active_tbl = active_tbl;
2325 current_tpt = window->average_tpt;
2326 /* Else poor success; go back to mode in "active" table */
2327 } else {
2328 IWL_DEBUG_RATE(mvm,
2329 "GOING BACK TO THE OLD TABLE: SR %d "
2330 "cur-tpt %d old-tpt %d\n",
2331 window->success_ratio,
2332 window->average_tpt,
2333 lq_sta->last_tpt);
2334
2335 /* Nullify "search" table */
2336 rate->type = LQ_NONE;
2337
2338 /* Revert to "active" table */
2339 active_tbl = lq_sta->active_tbl;
2340 tbl = &(lq_sta->lq_info[active_tbl]);
2341
2342 /* Revert to "active" rate and throughput info */
2343 index = tbl->rate.index;
2344 current_tpt = lq_sta->last_tpt;
2345
2346 /* Need to set up a new rate table in uCode */
2347 update_lq = 1;
2348 }
2349
2350 /* Either way, we've made a decision; modulation mode
2351 * search is done, allow rate adjustment next time. */
2352 lq_sta->search_better_tbl = 0;
2353 done_search = 1; /* Don't switch modes below! */
2354 goto lq_update;
2355 }
2356
2357 /* (Else) not in search of better modulation mode, try for better
2358 * starting rate, while staying in this mode. */
2359 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2360 low = high_low & 0xff;
2361 high = (high_low >> 8) & 0xff;
2362
2363 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2364
2365 sr = window->success_ratio;
2366
2367 /* Collect measured throughputs for current and adjacent rates */
2368 current_tpt = window->average_tpt;
2369 if (low != IWL_RATE_INVALID)
2370 low_tpt = tbl->win[low].average_tpt;
2371 if (high != IWL_RATE_INVALID)
2372 high_tpt = tbl->win[high].average_tpt;
2373
2374 IWL_DEBUG_RATE(mvm,
2375 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2376 rs_pretty_rate(rate), current_tpt, sr,
2377 low, high, low_tpt, high_tpt);
2378
2379 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2380 current_tpt, low_tpt, high_tpt);
2381
2382 /* Force a search in case BT doesn't like us being in MIMO */
2383 if (is_mimo(rate) &&
2384 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2385 IWL_DEBUG_RATE(mvm,
2386 "BT Coex forbids MIMO. Search for new config\n");
2387 rs_stay_in_table(lq_sta, true);
2388 goto lq_update;
2389 }
2390
2391 switch (scale_action) {
2392 case RS_ACTION_DOWNSCALE:
2393 /* Decrease starting rate, update uCode's rate table */
2394 if (low != IWL_RATE_INVALID) {
2395 update_lq = 1;
2396 index = low;
2397 } else {
2398 IWL_DEBUG_RATE(mvm,
2399 "At the bottom rate. Can't decrease\n");
2400 }
2401
2402 break;
2403 case RS_ACTION_UPSCALE:
2404 /* Increase starting rate, update uCode's rate table */
2405 if (high != IWL_RATE_INVALID) {
2406 update_lq = 1;
2407 index = high;
2408 } else {
2409 IWL_DEBUG_RATE(mvm,
2410 "At the top rate. Can't increase\n");
2411 }
2412
2413 break;
2414 case RS_ACTION_STAY:
2415 /* No change */
2416 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2417 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2418 break;
2419 default:
2420 break;
2421 }
2422
2423 lq_update:
2424 /* Replace uCode's rate table for the destination station. */
2425 if (update_lq) {
2426 tbl->rate.index = index;
2427 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2428 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2429 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2430 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2431 }
2432
2433 rs_stay_in_table(lq_sta, false);
2434
2435 /*
2436 * Search for new modulation mode if we're:
2437 * 1) Not changing rates right now
2438 * 2) Not just finishing up a search
2439 * 3) Allowing a new search
2440 */
2441 if (!update_lq && !done_search &&
2442 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2443 && window->counter) {
2444 enum rs_column next_column;
2445
2446 /* Save current throughput to compare with "search" throughput*/
2447 lq_sta->last_tpt = current_tpt;
2448
2449 IWL_DEBUG_RATE(mvm,
2450 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2451 update_lq, done_search, lq_sta->rs_state,
2452 window->counter);
2453
2454 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2455 if (next_column != RS_COLUMN_INVALID) {
2456 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2457 next_column);
2458 if (!ret)
2459 lq_sta->search_better_tbl = 1;
2460 } else {
2461 IWL_DEBUG_RATE(mvm,
2462 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2463 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2464 }
2465
2466 /* If new "search" mode was selected, set up in uCode table */
2467 if (lq_sta->search_better_tbl) {
2468 /* Access the "search" table, clear its history. */
2469 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2470 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2471
2472 /* Use new "search" start rate */
2473 index = tbl->rate.index;
2474
2475 rs_dump_rate(mvm, &tbl->rate,
2476 "Switch to SEARCH TABLE:");
2477 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2478 } else {
2479 done_search = 1;
2480 }
2481 }
2482
2483 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2484 /* If the "active" (non-search) mode was legacy,
2485 * and we've tried switching antennas,
2486 * but we haven't been able to try HT modes (not available),
2487 * stay with best antenna legacy modulation for a while
2488 * before next round of mode comparisons. */
2489 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2490 if (is_legacy(&tbl1->rate)) {
2491 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2492
2493 if (tid != IWL_MAX_TID_COUNT) {
2494 tid_data = &sta_priv->tid_data[tid];
2495 if (tid_data->state != IWL_AGG_OFF) {
2496 IWL_DEBUG_RATE(mvm,
2497 "Stop aggregation on tid %d\n",
2498 tid);
2499 ieee80211_stop_tx_ba_session(sta, tid);
2500 }
2501 }
2502 rs_set_stay_in_table(mvm, 1, lq_sta);
2503 } else {
2504 /* If we're in an HT mode, and all 3 mode switch actions
2505 * have been tried and compared, stay in this best modulation
2506 * mode for a while before next round of mode comparisons. */
2507 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2508 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2509 (tid != IWL_MAX_TID_COUNT)) {
2510 tid_data = &sta_priv->tid_data[tid];
2511 if (tid_data->state == IWL_AGG_OFF && !ndp) {
2512 IWL_DEBUG_RATE(mvm,
2513 "try to aggregate tid %d\n",
2514 tid);
2515 rs_tl_turn_on_agg(mvm, tid,
2516 lq_sta, sta);
2517 }
2518 }
2519 rs_set_stay_in_table(mvm, 0, lq_sta);
2520 }
2521 }
2522 }
2523
2524 struct rs_init_rate_info {
2525 s8 rssi;
2526 u8 rate_idx;
2527 };
2528
2529 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2530 { -60, IWL_RATE_54M_INDEX },
2531 { -64, IWL_RATE_48M_INDEX },
2532 { -68, IWL_RATE_36M_INDEX },
2533 { -80, IWL_RATE_24M_INDEX },
2534 { -84, IWL_RATE_18M_INDEX },
2535 { -85, IWL_RATE_12M_INDEX },
2536 { -86, IWL_RATE_11M_INDEX },
2537 { -88, IWL_RATE_5M_INDEX },
2538 { -90, IWL_RATE_2M_INDEX },
2539 { S8_MIN, IWL_RATE_1M_INDEX },
2540 };
2541
2542 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2543 { -60, IWL_RATE_54M_INDEX },
2544 { -64, IWL_RATE_48M_INDEX },
2545 { -72, IWL_RATE_36M_INDEX },
2546 { -80, IWL_RATE_24M_INDEX },
2547 { -84, IWL_RATE_18M_INDEX },
2548 { -85, IWL_RATE_12M_INDEX },
2549 { -87, IWL_RATE_9M_INDEX },
2550 { S8_MIN, IWL_RATE_6M_INDEX },
2551 };
2552
2553 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2554 { -60, IWL_RATE_MCS_7_INDEX },
2555 { -64, IWL_RATE_MCS_6_INDEX },
2556 { -68, IWL_RATE_MCS_5_INDEX },
2557 { -72, IWL_RATE_MCS_4_INDEX },
2558 { -80, IWL_RATE_MCS_3_INDEX },
2559 { -84, IWL_RATE_MCS_2_INDEX },
2560 { -85, IWL_RATE_MCS_1_INDEX },
2561 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2562 };
2563
2564 /* MCS index 9 is not valid for 20MHz VHT channel width,
2565 * but is ok for 40, 80 and 160MHz channels.
2566 */
2567 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2568 { -60, IWL_RATE_MCS_8_INDEX },
2569 { -64, IWL_RATE_MCS_7_INDEX },
2570 { -68, IWL_RATE_MCS_6_INDEX },
2571 { -72, IWL_RATE_MCS_5_INDEX },
2572 { -80, IWL_RATE_MCS_4_INDEX },
2573 { -84, IWL_RATE_MCS_3_INDEX },
2574 { -85, IWL_RATE_MCS_2_INDEX },
2575 { -87, IWL_RATE_MCS_1_INDEX },
2576 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2577 };
2578
2579 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2580 { -60, IWL_RATE_MCS_9_INDEX },
2581 { -64, IWL_RATE_MCS_8_INDEX },
2582 { -68, IWL_RATE_MCS_7_INDEX },
2583 { -72, IWL_RATE_MCS_6_INDEX },
2584 { -80, IWL_RATE_MCS_5_INDEX },
2585 { -84, IWL_RATE_MCS_4_INDEX },
2586 { -85, IWL_RATE_MCS_3_INDEX },
2587 { -87, IWL_RATE_MCS_2_INDEX },
2588 { -88, IWL_RATE_MCS_1_INDEX },
2589 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2590 };
2591
2592 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2593
2594 /* Init the optimal rate based on STA caps
2595 * This combined with rssi is used to report the last tx rate
2596 * to userspace when we haven't transmitted enough frames.
2597 */
2598 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2599 struct ieee80211_sta *sta,
2600 struct iwl_lq_sta *lq_sta)
2601 {
2602 struct rs_rate *rate = &lq_sta->optimal_rate;
2603
2604 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2605 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2606 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2607 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2608 else if (lq_sta->band == NL80211_BAND_5GHZ)
2609 rate->type = LQ_LEGACY_A;
2610 else
2611 rate->type = LQ_LEGACY_G;
2612
2613 rate->bw = rs_bw_from_sta_bw(sta);
2614 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2615
2616 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2617
2618 if (is_mimo(rate)) {
2619 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2620 } else if (is_siso(rate)) {
2621 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2622 } else {
2623 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2624
2625 if (lq_sta->band == NL80211_BAND_5GHZ) {
2626 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2627 lq_sta->optimal_nentries =
2628 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2629 } else {
2630 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2631 lq_sta->optimal_nentries =
2632 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2633 }
2634 }
2635
2636 if (is_vht(rate)) {
2637 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2638 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2639 lq_sta->optimal_nentries =
2640 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2641 } else {
2642 lq_sta->optimal_rates = rs_optimal_rates_vht;
2643 lq_sta->optimal_nentries =
2644 ARRAY_SIZE(rs_optimal_rates_vht);
2645 }
2646 } else if (is_ht(rate)) {
2647 lq_sta->optimal_rates = rs_optimal_rates_ht;
2648 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2649 }
2650 }
2651
2652 /* Compute the optimal rate index based on RSSI */
2653 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2654 struct iwl_lq_sta *lq_sta)
2655 {
2656 struct rs_rate *rate = &lq_sta->optimal_rate;
2657 int i;
2658
2659 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2660 BITS_PER_LONG);
2661
2662 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2663 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2664
2665 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2666 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2667 rate->index = rate_idx;
2668 break;
2669 }
2670 }
2671
2672 return rate;
2673 }
2674
2675 /* Choose an initial legacy rate and antenna to use based on the RSSI
2676 * of last Rx
2677 */
2678 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2679 struct ieee80211_sta *sta,
2680 struct iwl_lq_sta *lq_sta,
2681 enum nl80211_band band,
2682 struct rs_rate *rate)
2683 {
2684 int i, nentries;
2685 unsigned long active_rate;
2686 s8 best_rssi = S8_MIN;
2687 u8 best_ant = ANT_NONE;
2688 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2689 const struct rs_init_rate_info *initial_rates;
2690
2691 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2692 if (!(lq_sta->pers.chains & BIT(i)))
2693 continue;
2694
2695 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2696 best_rssi = lq_sta->pers.chain_signal[i];
2697 best_ant = BIT(i);
2698 }
2699 }
2700
2701 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2702 rs_pretty_ant(best_ant), best_rssi);
2703
2704 if (best_ant != ANT_A && best_ant != ANT_B)
2705 rate->ant = first_antenna(valid_tx_ant);
2706 else
2707 rate->ant = best_ant;
2708
2709 rate->sgi = false;
2710 rate->ldpc = false;
2711 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2712
2713 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2714 BITS_PER_LONG);
2715
2716 if (band == NL80211_BAND_5GHZ) {
2717 rate->type = LQ_LEGACY_A;
2718 initial_rates = rs_optimal_rates_5ghz_legacy;
2719 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2720 } else {
2721 rate->type = LQ_LEGACY_G;
2722 initial_rates = rs_optimal_rates_24ghz_legacy;
2723 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2724 }
2725
2726 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2727 goto out;
2728
2729 /* Start from a higher rate if the corresponding debug capability
2730 * is enabled. The rate is chosen according to AP capabilities.
2731 * In case of VHT/HT when the rssi is low fallback to the case of
2732 * legacy rates.
2733 */
2734 if (sta->vht_cap.vht_supported &&
2735 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2736 switch (sta->bandwidth) {
2737 case IEEE80211_STA_RX_BW_160:
2738 case IEEE80211_STA_RX_BW_80:
2739 case IEEE80211_STA_RX_BW_40:
2740 initial_rates = rs_optimal_rates_vht;
2741 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2742 break;
2743 case IEEE80211_STA_RX_BW_20:
2744 initial_rates = rs_optimal_rates_vht_20mhz;
2745 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2746 break;
2747 default:
2748 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2749 goto out;
2750 }
2751
2752 active_rate = lq_sta->active_siso_rate;
2753 rate->type = LQ_VHT_SISO;
2754 rate->bw = rs_bw_from_sta_bw(sta);
2755 } else if (sta->ht_cap.ht_supported &&
2756 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2757 initial_rates = rs_optimal_rates_ht;
2758 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2759 active_rate = lq_sta->active_siso_rate;
2760 rate->type = LQ_HT_SISO;
2761 } else {
2762 active_rate = lq_sta->active_legacy_rate;
2763 }
2764
2765 for (i = 0; i < nentries; i++) {
2766 int rate_idx = initial_rates[i].rate_idx;
2767
2768 if ((best_rssi >= initial_rates[i].rssi) &&
2769 (BIT(rate_idx) & active_rate)) {
2770 rate->index = rate_idx;
2771 break;
2772 }
2773 }
2774
2775 out:
2776 rs_dump_rate(mvm, rate, "INITIAL");
2777 }
2778
2779 /* Save info about RSSI of last Rx */
2780 void rs_update_last_rssi(struct iwl_mvm *mvm,
2781 struct iwl_lq_sta *lq_sta,
2782 struct ieee80211_rx_status *rx_status)
2783 {
2784 int i;
2785
2786 lq_sta->pers.chains = rx_status->chains;
2787 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2788 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2789 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2790 lq_sta->pers.last_rssi = S8_MIN;
2791
2792 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2793 if (!(lq_sta->pers.chains & BIT(i)))
2794 continue;
2795
2796 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2797 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2798 }
2799 }
2800
2801 /**
2802 * rs_initialize_lq - Initialize a station's hardware rate table
2803 *
2804 * The uCode's station table contains a table of fallback rates
2805 * for automatic fallback during transmission.
2806 *
2807 * NOTE: This sets up a default set of values. These will be replaced later
2808 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2809 * rc80211_simple.
2810 *
2811 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2812 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2813 * which requires station table entry to exist).
2814 */
2815 static void rs_initialize_lq(struct iwl_mvm *mvm,
2816 struct ieee80211_sta *sta,
2817 struct iwl_lq_sta *lq_sta,
2818 enum nl80211_band band,
2819 bool init)
2820 {
2821 struct iwl_scale_tbl_info *tbl;
2822 struct rs_rate *rate;
2823 u8 active_tbl = 0;
2824
2825 if (!sta || !lq_sta)
2826 return;
2827
2828 if (!lq_sta->search_better_tbl)
2829 active_tbl = lq_sta->active_tbl;
2830 else
2831 active_tbl = 1 - lq_sta->active_tbl;
2832
2833 tbl = &(lq_sta->lq_info[active_tbl]);
2834 rate = &tbl->rate;
2835
2836 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2837 rs_init_optimal_rate(mvm, sta, lq_sta);
2838
2839 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2840 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2841 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2842 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2843
2844 tbl->column = rs_get_column_from_rate(rate);
2845
2846 rs_set_expected_tpt_table(lq_sta, tbl);
2847 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2848 /* TODO restore station should remember the lq cmd */
2849 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2850 }
2851
2852 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2853 struct ieee80211_tx_rate_control *txrc)
2854 {
2855 struct sk_buff *skb = txrc->skb;
2856 struct iwl_op_mode *op_mode __maybe_unused =
2857 (struct iwl_op_mode *)mvm_r;
2858 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2859 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2860 struct iwl_lq_sta *lq_sta = mvm_sta;
2861 struct rs_rate *optimal_rate;
2862 u32 last_ucode_rate;
2863
2864 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2865 /* if vif isn't initialized mvm doesn't know about
2866 * this station, so don't do anything with the it
2867 */
2868 sta = NULL;
2869 mvm_sta = NULL;
2870 }
2871
2872 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2873
2874 /* Treat uninitialized rate scaling data same as non-existing. */
2875 if (lq_sta && !lq_sta->pers.drv) {
2876 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2877 mvm_sta = NULL;
2878 }
2879
2880 /* Send management frames and NO_ACK data using lowest rate. */
2881 if (rate_control_send_low(sta, mvm_sta, txrc))
2882 return;
2883
2884 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2885 info->band, &info->control.rates[0]);
2886 info->control.rates[0].count = 1;
2887
2888 /* Report the optimal rate based on rssi and STA caps if we haven't
2889 * converged yet (too little traffic) or exploring other modulations
2890 */
2891 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2892 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2893 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2894 optimal_rate);
2895 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2896 &txrc->reported_rate);
2897 }
2898 }
2899
2900 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2901 gfp_t gfp)
2902 {
2903 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2904 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2905 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2906 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2907
2908 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2909
2910 lq_sta->pers.drv = mvm;
2911 #ifdef CONFIG_MAC80211_DEBUGFS
2912 lq_sta->pers.dbg_fixed_rate = 0;
2913 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2914 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2915 #endif
2916 lq_sta->pers.chains = 0;
2917 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2918 lq_sta->pers.last_rssi = S8_MIN;
2919
2920 return &sta_priv->lq_sta;
2921 }
2922
2923 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2924 int nss)
2925 {
2926 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2927 (0x3 << (2 * (nss - 1)));
2928 rx_mcs >>= (2 * (nss - 1));
2929
2930 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2931 return IWL_RATE_MCS_7_INDEX;
2932 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2933 return IWL_RATE_MCS_8_INDEX;
2934 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2935 return IWL_RATE_MCS_9_INDEX;
2936
2937 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2938 return -1;
2939 }
2940
2941 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2942 struct ieee80211_sta_vht_cap *vht_cap,
2943 struct iwl_lq_sta *lq_sta)
2944 {
2945 int i;
2946 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2947
2948 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2949 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2950 if (i == IWL_RATE_9M_INDEX)
2951 continue;
2952
2953 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2954 if (i == IWL_RATE_MCS_9_INDEX &&
2955 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2956 continue;
2957
2958 lq_sta->active_siso_rate |= BIT(i);
2959 }
2960 }
2961
2962 if (sta->rx_nss < 2)
2963 return;
2964
2965 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2966 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2967 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2968 if (i == IWL_RATE_9M_INDEX)
2969 continue;
2970
2971 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2972 if (i == IWL_RATE_MCS_9_INDEX &&
2973 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2974 continue;
2975
2976 lq_sta->active_mimo2_rate |= BIT(i);
2977 }
2978 }
2979 }
2980
2981 static void rs_ht_init(struct iwl_mvm *mvm,
2982 struct ieee80211_sta *sta,
2983 struct iwl_lq_sta *lq_sta,
2984 struct ieee80211_sta_ht_cap *ht_cap)
2985 {
2986 /* active_siso_rate mask includes 9 MBits (bit 5),
2987 * and CCK (bits 0-3), supp_rates[] does not;
2988 * shift to convert format, force 9 MBits off.
2989 */
2990 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2991 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2992 lq_sta->active_siso_rate &= ~((u16)0x2);
2993 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2994
2995 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2996 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2997 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2998 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2999
3000 if (mvm->cfg->ht_params->ldpc &&
3001 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3002 lq_sta->ldpc = true;
3003
3004 if (mvm->cfg->ht_params->stbc &&
3005 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3006 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3007 lq_sta->stbc_capable = true;
3008
3009 lq_sta->is_vht = false;
3010 }
3011
3012 static void rs_vht_init(struct iwl_mvm *mvm,
3013 struct ieee80211_sta *sta,
3014 struct iwl_lq_sta *lq_sta,
3015 struct ieee80211_sta_vht_cap *vht_cap)
3016 {
3017 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3018
3019 if (mvm->cfg->ht_params->ldpc &&
3020 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3021 lq_sta->ldpc = true;
3022
3023 if (mvm->cfg->ht_params->stbc &&
3024 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3025 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3026 lq_sta->stbc_capable = true;
3027
3028 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3029 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3030 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3031 lq_sta->bfer_capable = true;
3032
3033 lq_sta->is_vht = true;
3034 }
3035
3036 #ifdef CONFIG_IWLWIFI_DEBUGFS
3037 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3038 {
3039 spin_lock_bh(&mvm->drv_stats_lock);
3040 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3041 spin_unlock_bh(&mvm->drv_stats_lock);
3042 }
3043
3044 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3045 {
3046 u8 nss = 0;
3047
3048 spin_lock(&mvm->drv_stats_lock);
3049
3050 if (agg)
3051 mvm->drv_rx_stats.agg_frames++;
3052
3053 mvm->drv_rx_stats.success_frames++;
3054
3055 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3056 case RATE_MCS_CHAN_WIDTH_20:
3057 mvm->drv_rx_stats.bw_20_frames++;
3058 break;
3059 case RATE_MCS_CHAN_WIDTH_40:
3060 mvm->drv_rx_stats.bw_40_frames++;
3061 break;
3062 case RATE_MCS_CHAN_WIDTH_80:
3063 mvm->drv_rx_stats.bw_80_frames++;
3064 break;
3065 case RATE_MCS_CHAN_WIDTH_160:
3066 mvm->drv_rx_stats.bw_160_frames++;
3067 break;
3068 default:
3069 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3070 }
3071
3072 if (rate & RATE_MCS_HT_MSK) {
3073 mvm->drv_rx_stats.ht_frames++;
3074 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3075 } else if (rate & RATE_MCS_VHT_MSK) {
3076 mvm->drv_rx_stats.vht_frames++;
3077 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3078 RATE_VHT_MCS_NSS_POS) + 1;
3079 } else {
3080 mvm->drv_rx_stats.legacy_frames++;
3081 }
3082
3083 if (nss == 1)
3084 mvm->drv_rx_stats.siso_frames++;
3085 else if (nss == 2)
3086 mvm->drv_rx_stats.mimo2_frames++;
3087
3088 if (rate & RATE_MCS_SGI_MSK)
3089 mvm->drv_rx_stats.sgi_frames++;
3090 else
3091 mvm->drv_rx_stats.ngi_frames++;
3092
3093 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3094 mvm->drv_rx_stats.last_frame_idx =
3095 (mvm->drv_rx_stats.last_frame_idx + 1) %
3096 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3097
3098 spin_unlock(&mvm->drv_stats_lock);
3099 }
3100 #endif
3101
3102 /*
3103 * Called after adding a new station to initialize rate scaling
3104 */
3105 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3106 enum nl80211_band band, bool init)
3107 {
3108 int i, j;
3109 struct ieee80211_hw *hw = mvm->hw;
3110 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3111 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3112 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3113 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3114 struct ieee80211_supported_band *sband;
3115 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3116
3117 /* clear all non-persistent lq data */
3118 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3119
3120 sband = hw->wiphy->bands[band];
3121
3122 lq_sta->lq.sta_id = sta_priv->sta_id;
3123 sta_priv->tlc_amsdu = false;
3124
3125 for (j = 0; j < LQ_SIZE; j++)
3126 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3127
3128 lq_sta->flush_timer = 0;
3129 lq_sta->last_tx = jiffies;
3130
3131 IWL_DEBUG_RATE(mvm,
3132 "LQ: *** rate scale station global init for station %d ***\n",
3133 sta_priv->sta_id);
3134 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3135 * the lowest or the highest rate.. Could consider using RSSI from
3136 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3137 * after assoc.. */
3138
3139 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3140 lq_sta->band = sband->band;
3141 /*
3142 * active legacy rates as per supported rates bitmap
3143 */
3144 supp = sta->supp_rates[sband->band];
3145 lq_sta->active_legacy_rate = 0;
3146 for_each_set_bit(i, &supp, BITS_PER_LONG)
3147 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3148
3149 /* TODO: should probably account for rx_highest for both HT/VHT */
3150 if (!vht_cap || !vht_cap->vht_supported)
3151 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3152 else
3153 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3154
3155 lq_sta->max_legacy_rate_idx =
3156 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3157 lq_sta->max_siso_rate_idx =
3158 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3159 lq_sta->max_mimo2_rate_idx =
3160 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3161
3162 IWL_DEBUG_RATE(mvm,
3163 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3164 lq_sta->active_legacy_rate,
3165 lq_sta->active_siso_rate,
3166 lq_sta->active_mimo2_rate,
3167 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3168 lq_sta->bfer_capable);
3169 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3170 lq_sta->max_legacy_rate_idx,
3171 lq_sta->max_siso_rate_idx,
3172 lq_sta->max_mimo2_rate_idx);
3173
3174 /* These values will be overridden later */
3175 lq_sta->lq.single_stream_ant_msk =
3176 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3177 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3178
3179 /* as default allow aggregation for all tids */
3180 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3181 lq_sta->is_agg = 0;
3182 #ifdef CONFIG_IWLWIFI_DEBUGFS
3183 iwl_mvm_reset_frame_stats(mvm);
3184 #endif
3185 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3186 }
3187
3188 static void rs_rate_update(void *mvm_r,
3189 struct ieee80211_supported_band *sband,
3190 struct cfg80211_chan_def *chandef,
3191 struct ieee80211_sta *sta, void *priv_sta,
3192 u32 changed)
3193 {
3194 u8 tid;
3195 struct iwl_op_mode *op_mode =
3196 (struct iwl_op_mode *)mvm_r;
3197 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3198
3199 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3200 return;
3201
3202 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3203 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3204 ieee80211_stop_tx_ba_session(sta, tid);
3205
3206 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3207 }
3208
3209 #ifdef CONFIG_MAC80211_DEBUGFS
3210 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3211 struct iwl_lq_cmd *lq_cmd,
3212 enum nl80211_band band,
3213 u32 ucode_rate)
3214 {
3215 struct rs_rate rate;
3216 int i;
3217 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3218 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3219 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3220
3221 for (i = 0; i < num_rates; i++)
3222 lq_cmd->rs_table[i] = ucode_rate_le32;
3223
3224 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3225
3226 if (is_mimo(&rate))
3227 lq_cmd->mimo_delim = num_rates - 1;
3228 else
3229 lq_cmd->mimo_delim = 0;
3230
3231 lq_cmd->reduced_tpc = 0;
3232
3233 if (num_of_ant(ant) == 1)
3234 lq_cmd->single_stream_ant_msk = ant;
3235
3236 if (!mvm->trans->cfg->gen2)
3237 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3238 else
3239 lq_cmd->agg_frame_cnt_limit =
3240 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3241 }
3242 #endif /* CONFIG_MAC80211_DEBUGFS */
3243
3244 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3245 struct iwl_lq_sta *lq_sta,
3246 struct rs_rate *rate,
3247 __le32 *rs_table, int *rs_table_index,
3248 int num_rates, int num_retries,
3249 u8 valid_tx_ant, bool toggle_ant)
3250 {
3251 int i, j;
3252 __le32 ucode_rate;
3253 bool bottom_reached = false;
3254 int prev_rate_idx = rate->index;
3255 int end = LINK_QUAL_MAX_RETRY_NUM;
3256 int index = *rs_table_index;
3257
3258 for (i = 0; i < num_rates && index < end; i++) {
3259 for (j = 0; j < num_retries && index < end; j++, index++) {
3260 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3261 rate));
3262 rs_table[index] = ucode_rate;
3263 if (toggle_ant)
3264 rs_toggle_antenna(valid_tx_ant, rate);
3265 }
3266
3267 prev_rate_idx = rate->index;
3268 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3269 if (bottom_reached && !is_legacy(rate))
3270 break;
3271 }
3272
3273 if (!bottom_reached && !is_legacy(rate))
3274 rate->index = prev_rate_idx;
3275
3276 *rs_table_index = index;
3277 }
3278
3279 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3280 * column the rate table should look like this:
3281 *
3282 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3283 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3284 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3285 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3286 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3287 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3288 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3289 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3290 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3291 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3292 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3293 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3294 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3295 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3296 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3297 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3298 */
3299 static void rs_build_rates_table(struct iwl_mvm *mvm,
3300 struct ieee80211_sta *sta,
3301 struct iwl_lq_sta *lq_sta,
3302 const struct rs_rate *initial_rate)
3303 {
3304 struct rs_rate rate;
3305 int num_rates, num_retries, index = 0;
3306 u8 valid_tx_ant = 0;
3307 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3308 bool toggle_ant = false;
3309 u32 color;
3310
3311 memcpy(&rate, initial_rate, sizeof(rate));
3312
3313 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3314
3315 /* TODO: remove old API when min FW API hits 14 */
3316 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3317 rs_stbc_allow(mvm, sta, lq_sta))
3318 rate.stbc = true;
3319
3320 if (is_siso(&rate)) {
3321 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3322 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3323 } else if (is_mimo(&rate)) {
3324 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3325 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3326 } else {
3327 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3328 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3329 toggle_ant = true;
3330 }
3331
3332 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3333 num_rates, num_retries, valid_tx_ant,
3334 toggle_ant);
3335
3336 rs_get_lower_rate_down_column(lq_sta, &rate);
3337
3338 if (is_siso(&rate)) {
3339 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3340 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3341 lq_cmd->mimo_delim = index;
3342 } else if (is_legacy(&rate)) {
3343 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3344 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3345 } else {
3346 WARN_ON_ONCE(1);
3347 }
3348
3349 toggle_ant = true;
3350
3351 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3352 num_rates, num_retries, valid_tx_ant,
3353 toggle_ant);
3354
3355 rs_get_lower_rate_down_column(lq_sta, &rate);
3356
3357 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3358 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3359
3360 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3361 num_rates, num_retries, valid_tx_ant,
3362 toggle_ant);
3363
3364 /* update the color of the LQ command (as a counter at bits 1-3) */
3365 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3366 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3367 }
3368
3369 struct rs_bfer_active_iter_data {
3370 struct ieee80211_sta *exclude_sta;
3371 struct iwl_mvm_sta *bfer_mvmsta;
3372 };
3373
3374 static void rs_bfer_active_iter(void *_data,
3375 struct ieee80211_sta *sta)
3376 {
3377 struct rs_bfer_active_iter_data *data = _data;
3378 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3379 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3380 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3381
3382 if (sta == data->exclude_sta)
3383 return;
3384
3385 /* The current sta has BFER allowed */
3386 if (ss_params & LQ_SS_BFER_ALLOWED) {
3387 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3388
3389 data->bfer_mvmsta = mvmsta;
3390 }
3391 }
3392
3393 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3394 {
3395 int prio = -1;
3396 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3397
3398 switch (viftype) {
3399 case NL80211_IFTYPE_AP:
3400 case NL80211_IFTYPE_P2P_GO:
3401 prio = 3;
3402 break;
3403 case NL80211_IFTYPE_P2P_CLIENT:
3404 prio = 2;
3405 break;
3406 case NL80211_IFTYPE_STATION:
3407 prio = 1;
3408 break;
3409 default:
3410 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3411 prio = -1;
3412 }
3413
3414 return prio;
3415 }
3416
3417 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3418 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3419 struct iwl_mvm_sta *sta2)
3420 {
3421 int prio1 = rs_bfer_priority(sta1);
3422 int prio2 = rs_bfer_priority(sta2);
3423
3424 if (prio1 > prio2)
3425 return 1;
3426 if (prio1 < prio2)
3427 return -1;
3428 return 0;
3429 }
3430
3431 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3432 struct ieee80211_sta *sta,
3433 struct iwl_lq_sta *lq_sta,
3434 const struct rs_rate *initial_rate)
3435 {
3436 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3437 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3438 struct rs_bfer_active_iter_data data = {
3439 .exclude_sta = sta,
3440 .bfer_mvmsta = NULL,
3441 };
3442 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3443 u32 ss_params = LQ_SS_PARAMS_VALID;
3444
3445 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3446 goto out;
3447
3448 #ifdef CONFIG_MAC80211_DEBUGFS
3449 /* Check if forcing the decision is configured.
3450 * Note that SISO is forced by not allowing STBC or BFER
3451 */
3452 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3453 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3454 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3455 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3456
3457 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3458 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3459 lq_sta->pers.ss_force);
3460 goto out;
3461 }
3462 #endif
3463
3464 if (lq_sta->stbc_capable)
3465 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3466
3467 if (!lq_sta->bfer_capable)
3468 goto out;
3469
3470 ieee80211_iterate_stations_atomic(mvm->hw,
3471 rs_bfer_active_iter,
3472 &data);
3473 bfer_mvmsta = data.bfer_mvmsta;
3474
3475 /* This code is safe as it doesn't run concurrently for different
3476 * stations. This is guaranteed by the fact that calls to
3477 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3478 */
3479 if (!bfer_mvmsta) {
3480 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3481
3482 ss_params |= LQ_SS_BFER_ALLOWED;
3483 goto out;
3484 }
3485
3486 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3487 bfer_mvmsta->sta_id);
3488
3489 /* Disallow BFER on another STA if active and we're a higher priority */
3490 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3491 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3492 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3493
3494 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3495 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3496 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3497
3498 ss_params |= LQ_SS_BFER_ALLOWED;
3499 IWL_DEBUG_RATE(mvm,
3500 "Lower priority BFER sta found (%d). Switch BFER\n",
3501 bfer_mvmsta->sta_id);
3502 }
3503 out:
3504 lq_cmd->ss_params = cpu_to_le32(ss_params);
3505 }
3506
3507 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3508 struct ieee80211_sta *sta,
3509 struct iwl_lq_sta *lq_sta,
3510 const struct rs_rate *initial_rate)
3511 {
3512 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3513 struct iwl_mvm_sta *mvmsta;
3514 struct iwl_mvm_vif *mvmvif;
3515
3516 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3517 lq_cmd->agg_time_limit =
3518 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3519
3520 #ifdef CONFIG_MAC80211_DEBUGFS
3521 if (lq_sta->pers.dbg_fixed_rate) {
3522 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3523 lq_sta->band,
3524 lq_sta->pers.dbg_fixed_rate);
3525 return;
3526 }
3527 #endif
3528 if (WARN_ON_ONCE(!sta || !initial_rate))
3529 return;
3530
3531 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3532
3533 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3534 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3535
3536 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3537 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3538
3539 if (num_of_ant(initial_rate->ant) == 1)
3540 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3541
3542 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3543
3544 /*
3545 * In case of low latency, tell the firmware to leave a frame in the
3546 * Tx Fifo so that it can start a transaction in the same TxOP. This
3547 * basically allows the firmware to send bursts.
3548 */
3549 if (iwl_mvm_vif_low_latency(mvmvif))
3550 lq_cmd->agg_frame_cnt_limit--;
3551
3552 if (mvmsta->vif->p2p)
3553 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3554
3555 lq_cmd->agg_time_limit =
3556 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3557 }
3558
3559 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3560 {
3561 return hw->priv;
3562 }
3563 /* rate scale requires free function to be implemented */
3564 static void rs_free(void *mvm_rate)
3565 {
3566 return;
3567 }
3568
3569 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3570 void *mvm_sta)
3571 {
3572 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3573 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3574
3575 IWL_DEBUG_RATE(mvm, "enter\n");
3576 IWL_DEBUG_RATE(mvm, "leave\n");
3577 }
3578
3579 #ifdef CONFIG_MAC80211_DEBUGFS
3580 int rs_pretty_print_rate(char *buf, const u32 rate)
3581 {
3582
3583 char *type, *bw;
3584 u8 mcs = 0, nss = 0;
3585 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3586
3587 if (!(rate & RATE_MCS_HT_MSK) &&
3588 !(rate & RATE_MCS_VHT_MSK)) {
3589 int index = iwl_hwrate_to_plcp_idx(rate);
3590
3591 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3592 rs_pretty_ant(ant),
3593 index == IWL_RATE_INVALID ? "BAD" :
3594 iwl_rate_mcs[index].mbps);
3595 }
3596
3597 if (rate & RATE_MCS_VHT_MSK) {
3598 type = "VHT";
3599 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3600 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3601 >> RATE_VHT_MCS_NSS_POS) + 1;
3602 } else if (rate & RATE_MCS_HT_MSK) {
3603 type = "HT";
3604 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3605 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3606 >> RATE_HT_MCS_NSS_POS) + 1;
3607 } else {
3608 type = "Unknown"; /* shouldn't happen */
3609 }
3610
3611 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3612 case RATE_MCS_CHAN_WIDTH_20:
3613 bw = "20Mhz";
3614 break;
3615 case RATE_MCS_CHAN_WIDTH_40:
3616 bw = "40Mhz";
3617 break;
3618 case RATE_MCS_CHAN_WIDTH_80:
3619 bw = "80Mhz";
3620 break;
3621 case RATE_MCS_CHAN_WIDTH_160:
3622 bw = "160Mhz";
3623 break;
3624 default:
3625 bw = "BAD BW";
3626 }
3627
3628 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3629 type, rs_pretty_ant(ant), bw, mcs, nss,
3630 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3631 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3632 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3633 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3634 }
3635
3636 /**
3637 * Program the device to use fixed rate for frame transmit
3638 * This is for debugging/testing only
3639 * once the device start use fixed rate, we need to reload the module
3640 * to being back the normal operation.
3641 */
3642 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3643 struct iwl_lq_sta *lq_sta)
3644 {
3645 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3646 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3647 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3648
3649 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3650 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3651
3652 if (lq_sta->pers.dbg_fixed_rate) {
3653 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3654 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3655 }
3656 }
3657
3658 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3659 const char __user *user_buf, size_t count, loff_t *ppos)
3660 {
3661 struct iwl_lq_sta *lq_sta = file->private_data;
3662 struct iwl_mvm *mvm;
3663 char buf[64];
3664 size_t buf_size;
3665 u32 parsed_rate;
3666
3667 mvm = lq_sta->pers.drv;
3668 memset(buf, 0, sizeof(buf));
3669 buf_size = min(count, sizeof(buf) - 1);
3670 if (copy_from_user(buf, user_buf, buf_size))
3671 return -EFAULT;
3672
3673 if (sscanf(buf, "%x", &parsed_rate) == 1)
3674 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3675 else
3676 lq_sta->pers.dbg_fixed_rate = 0;
3677
3678 rs_program_fix_rate(mvm, lq_sta);
3679
3680 return count;
3681 }
3682
3683 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3684 char __user *user_buf, size_t count, loff_t *ppos)
3685 {
3686 char *buff;
3687 int desc = 0;
3688 int i = 0;
3689 ssize_t ret;
3690
3691 struct iwl_lq_sta *lq_sta = file->private_data;
3692 struct iwl_mvm_sta *mvmsta =
3693 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3694 struct iwl_mvm *mvm;
3695 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3696 struct rs_rate *rate = &tbl->rate;
3697 u32 ss_params;
3698
3699 mvm = lq_sta->pers.drv;
3700 buff = kmalloc(2048, GFP_KERNEL);
3701 if (!buff)
3702 return -ENOMEM;
3703
3704 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3705 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3706 lq_sta->total_failed, lq_sta->total_success,
3707 lq_sta->active_legacy_rate);
3708 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3709 lq_sta->pers.dbg_fixed_rate);
3710 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3711 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3712 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3713 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3714 desc += sprintf(buff+desc, "lq type %s\n",
3715 (is_legacy(rate)) ? "legacy" :
3716 is_vht(rate) ? "VHT" : "HT");
3717 if (!is_legacy(rate)) {
3718 desc += sprintf(buff + desc, " %s",
3719 (is_siso(rate)) ? "SISO" : "MIMO2");
3720 desc += sprintf(buff + desc, " %s",
3721 (is_ht20(rate)) ? "20MHz" :
3722 (is_ht40(rate)) ? "40MHz" :
3723 (is_ht80(rate)) ? "80MHz" :
3724 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3725 desc += sprintf(buff + desc, " %s %s %s %s\n",
3726 (rate->sgi) ? "SGI" : "NGI",
3727 (rate->ldpc) ? "LDPC" : "BCC",
3728 (lq_sta->is_agg) ? "AGG on" : "",
3729 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3730 }
3731 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3732 lq_sta->last_rate_n_flags);
3733 desc += sprintf(buff+desc,
3734 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3735 lq_sta->lq.flags,
3736 lq_sta->lq.mimo_delim,
3737 lq_sta->lq.single_stream_ant_msk,
3738 lq_sta->lq.dual_stream_ant_msk);
3739
3740 desc += sprintf(buff+desc,
3741 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3742 le16_to_cpu(lq_sta->lq.agg_time_limit),
3743 lq_sta->lq.agg_disable_start_th,
3744 lq_sta->lq.agg_frame_cnt_limit);
3745
3746 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3747 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3748 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3749 (ss_params & LQ_SS_PARAMS_VALID) ?
3750 "VALID" : "INVALID",
3751 (ss_params & LQ_SS_BFER_ALLOWED) ?
3752 ", BFER" : "",
3753 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3754 ", STBC" : "",
3755 (ss_params & LQ_SS_FORCE) ?
3756 ", FORCE" : "");
3757 desc += sprintf(buff+desc,
3758 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3759 lq_sta->lq.initial_rate_index[0],
3760 lq_sta->lq.initial_rate_index[1],
3761 lq_sta->lq.initial_rate_index[2],
3762 lq_sta->lq.initial_rate_index[3]);
3763
3764 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3765 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3766
3767 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3768 desc += rs_pretty_print_rate(buff+desc, r);
3769 }
3770
3771 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3772 kfree(buff);
3773 return ret;
3774 }
3775
3776 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3777 .write = rs_sta_dbgfs_scale_table_write,
3778 .read = rs_sta_dbgfs_scale_table_read,
3779 .open = simple_open,
3780 .llseek = default_llseek,
3781 };
3782 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3783 char __user *user_buf, size_t count, loff_t *ppos)
3784 {
3785 char *buff;
3786 int desc = 0;
3787 int i, j;
3788 ssize_t ret;
3789 struct iwl_scale_tbl_info *tbl;
3790 struct rs_rate *rate;
3791 struct iwl_lq_sta *lq_sta = file->private_data;
3792
3793 buff = kmalloc(1024, GFP_KERNEL);
3794 if (!buff)
3795 return -ENOMEM;
3796
3797 for (i = 0; i < LQ_SIZE; i++) {
3798 tbl = &(lq_sta->lq_info[i]);
3799 rate = &tbl->rate;
3800 desc += sprintf(buff+desc,
3801 "%s type=%d SGI=%d BW=%s DUP=0\n"
3802 "index=%d\n",
3803 lq_sta->active_tbl == i ? "*" : "x",
3804 rate->type,
3805 rate->sgi,
3806 is_ht20(rate) ? "20MHz" :
3807 is_ht40(rate) ? "40MHz" :
3808 is_ht80(rate) ? "80MHz" :
3809 is_ht160(rate) ? "160MHz" : "ERR",
3810 rate->index);
3811 for (j = 0; j < IWL_RATE_COUNT; j++) {
3812 desc += sprintf(buff+desc,
3813 "counter=%d success=%d %%=%d\n",
3814 tbl->win[j].counter,
3815 tbl->win[j].success_counter,
3816 tbl->win[j].success_ratio);
3817 }
3818 }
3819 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3820 kfree(buff);
3821 return ret;
3822 }
3823
3824 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3825 .read = rs_sta_dbgfs_stats_table_read,
3826 .open = simple_open,
3827 .llseek = default_llseek,
3828 };
3829
3830 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3831 char __user *user_buf,
3832 size_t count, loff_t *ppos)
3833 {
3834 static const char * const column_name[] = {
3835 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3836 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3837 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3838 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3839 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3840 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3841 [RS_COLUMN_MIMO2] = "MIMO2",
3842 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3843 };
3844
3845 static const char * const rate_name[] = {
3846 [IWL_RATE_1M_INDEX] = "1M",
3847 [IWL_RATE_2M_INDEX] = "2M",
3848 [IWL_RATE_5M_INDEX] = "5.5M",
3849 [IWL_RATE_11M_INDEX] = "11M",
3850 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3851 [IWL_RATE_9M_INDEX] = "9M",
3852 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3853 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3854 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3855 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3856 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3857 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3858 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3859 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3860 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3861 };
3862
3863 char *buff, *pos, *endpos;
3864 int col, rate;
3865 ssize_t ret;
3866 struct iwl_lq_sta *lq_sta = file->private_data;
3867 struct rs_rate_stats *stats;
3868 static const size_t bufsz = 1024;
3869
3870 buff = kmalloc(bufsz, GFP_KERNEL);
3871 if (!buff)
3872 return -ENOMEM;
3873
3874 pos = buff;
3875 endpos = pos + bufsz;
3876
3877 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3878 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3879 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3880 pos += scnprintf(pos, endpos - pos, "\n");
3881
3882 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3883 pos += scnprintf(pos, endpos - pos,
3884 "%s,", column_name[col]);
3885
3886 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3887 stats = &(lq_sta->pers.tx_stats[col][rate]);
3888 pos += scnprintf(pos, endpos - pos,
3889 "%llu/%llu,",
3890 stats->success,
3891 stats->total);
3892 }
3893 pos += scnprintf(pos, endpos - pos, "\n");
3894 }
3895
3896 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3897 kfree(buff);
3898 return ret;
3899 }
3900
3901 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3902 const char __user *user_buf,
3903 size_t count, loff_t *ppos)
3904 {
3905 struct iwl_lq_sta *lq_sta = file->private_data;
3906 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3907
3908 return count;
3909 }
3910
3911 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3912 .read = rs_sta_dbgfs_drv_tx_stats_read,
3913 .write = rs_sta_dbgfs_drv_tx_stats_write,
3914 .open = simple_open,
3915 .llseek = default_llseek,
3916 };
3917
3918 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3919 char __user *user_buf,
3920 size_t count, loff_t *ppos)
3921 {
3922 struct iwl_lq_sta *lq_sta = file->private_data;
3923 char buf[12];
3924 int bufsz = sizeof(buf);
3925 int pos = 0;
3926 static const char * const ss_force_name[] = {
3927 [RS_SS_FORCE_NONE] = "none",
3928 [RS_SS_FORCE_STBC] = "stbc",
3929 [RS_SS_FORCE_BFER] = "bfer",
3930 [RS_SS_FORCE_SISO] = "siso",
3931 };
3932
3933 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3934 ss_force_name[lq_sta->pers.ss_force]);
3935 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3936 }
3937
3938 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3939 size_t count, loff_t *ppos)
3940 {
3941 struct iwl_mvm *mvm = lq_sta->pers.drv;
3942 int ret = 0;
3943
3944 if (!strncmp("none", buf, 4)) {
3945 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3946 } else if (!strncmp("siso", buf, 4)) {
3947 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3948 } else if (!strncmp("stbc", buf, 4)) {
3949 if (lq_sta->stbc_capable) {
3950 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3951 } else {
3952 IWL_ERR(mvm,
3953 "can't force STBC. peer doesn't support\n");
3954 ret = -EINVAL;
3955 }
3956 } else if (!strncmp("bfer", buf, 4)) {
3957 if (lq_sta->bfer_capable) {
3958 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3959 } else {
3960 IWL_ERR(mvm,
3961 "can't force BFER. peer doesn't support\n");
3962 ret = -EINVAL;
3963 }
3964 } else {
3965 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3966 ret = -EINVAL;
3967 }
3968 return ret ?: count;
3969 }
3970
3971 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3972 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3973 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3974 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3975 &iwl_dbgfs_##name##_ops)) \
3976 goto err; \
3977 } while (0)
3978
3979 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3980
3981 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3982 {
3983 struct iwl_lq_sta *lq_sta = priv_sta;
3984 struct iwl_mvm_sta *mvmsta;
3985
3986 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3987
3988 if (!mvmsta->vif)
3989 return;
3990
3991 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3992 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3993 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3994 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3995 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3996 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3997 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3998 &lq_sta->tx_agg_tid_en);
3999 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4000 &lq_sta->pers.dbg_fixed_txp_reduction);
4001
4002 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4003 return;
4004 err:
4005 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4006 }
4007
4008 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4009 {
4010 }
4011 #endif
4012
4013 /*
4014 * Initialization of rate scaling information is done by driver after
4015 * the station is added. Since mac80211 calls this function before a
4016 * station is added we ignore it.
4017 */
4018 static void rs_rate_init_stub(void *mvm_r,
4019 struct ieee80211_supported_band *sband,
4020 struct cfg80211_chan_def *chandef,
4021 struct ieee80211_sta *sta, void *mvm_sta)
4022 {
4023 }
4024
4025 static const struct rate_control_ops rs_mvm_ops = {
4026 .name = RS_NAME,
4027 .tx_status = rs_mac80211_tx_status,
4028 .get_rate = rs_get_rate,
4029 .rate_init = rs_rate_init_stub,
4030 .alloc = rs_alloc,
4031 .free = rs_free,
4032 .alloc_sta = rs_alloc_sta,
4033 .free_sta = rs_free_sta,
4034 .rate_update = rs_rate_update,
4035 #ifdef CONFIG_MAC80211_DEBUGFS
4036 .add_sta_debugfs = rs_add_debugfs,
4037 .remove_sta_debugfs = rs_remove_debugfs,
4038 #endif
4039 };
4040
4041 int iwl_mvm_rate_control_register(void)
4042 {
4043 return ieee80211_rate_control_register(&rs_mvm_ops);
4044 }
4045
4046 void iwl_mvm_rate_control_unregister(void)
4047 {
4048 ieee80211_rate_control_unregister(&rs_mvm_ops);
4049 }
4050
4051 /**
4052 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4053 * Tx protection, according to this request and previous requests,
4054 * and send the LQ command.
4055 * @mvmsta: The station
4056 * @enable: Enable Tx protection?
4057 */
4058 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4059 bool enable)
4060 {
4061 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4062
4063 lockdep_assert_held(&mvm->mutex);
4064
4065 if (enable) {
4066 if (mvmsta->tx_protection == 0)
4067 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4068 mvmsta->tx_protection++;
4069 } else {
4070 mvmsta->tx_protection--;
4071 if (mvmsta->tx_protection == 0)
4072 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4073 }
4074
4075 return iwl_mvm_send_lq_cmd(mvm, lq, false);
4076 }
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