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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / mvm / rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 *
19 * The full GNU General Public License is included in this distribution in the
20 * file called LICENSE.
21 *
22 * Contact Information:
23 * Intel Linux Wireless <ilw@linux.intel.com>
24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *
26 *****************************************************************************/
27 #include <linux/kernel.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37 #include "rs.h"
38 #include "fw-api.h"
39 #include "sta.h"
40 #include "iwl-op-mode.h"
41 #include "mvm.h"
42 #include "debugfs.h"
43
44 #define RS_NAME "iwl-mvm-rs"
45
46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
47
48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
49 * Use this macro when dealing with thresholds consts set as a percentage
50 */
51 #define RS_PERCENT(x) (128 * x)
52
53 static u8 rs_ht_to_legacy[] = {
54 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
55 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
56 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
57 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
58 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
59 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
60 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
61 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 [ANT_NONE] = ANT_NONE,
68 [ANT_A] = ANT_B,
69 [ANT_B] = ANT_C,
70 [ANT_AB] = ANT_BC,
71 [ANT_C] = ANT_A,
72 [ANT_AC] = ANT_AB,
73 [ANT_BC] = ANT_AC,
74 [ANT_ABC] = ANT_ABC,
75 };
76
77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
83 IWL_RATE_##rp##M_INDEX, \
84 IWL_RATE_##rn##M_INDEX }
85
86 #define IWL_DECLARE_MCS_RATE(s) \
87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_INVM_INDEX, \
93 IWL_RATE_INVM_INDEX }
94
95 /*
96 * Parameter order:
97 * rate, ht rate, prev rate, next rate
98 *
99 * If there isn't a valid next or previous rate then INV is used which
100 * maps to IWL_RATE_INVALID
101 *
102 */
103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
104 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
105 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
106 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
107 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
109 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
119 };
120
121 enum rs_action {
122 RS_ACTION_STAY = 0,
123 RS_ACTION_DOWNSCALE = -1,
124 RS_ACTION_UPSCALE = 1,
125 };
126
127 enum rs_column_mode {
128 RS_INVALID = 0,
129 RS_LEGACY,
130 RS_SISO,
131 RS_MIMO2,
132 };
133
134 #define MAX_NEXT_COLUMNS 7
135 #define MAX_COLUMN_CHECKS 3
136
137 struct rs_tx_column;
138
139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
140 struct ieee80211_sta *sta,
141 struct iwl_scale_tbl_info *tbl,
142 const struct rs_tx_column *next_col);
143
144 struct rs_tx_column {
145 enum rs_column_mode mode;
146 u8 ant;
147 bool sgi;
148 enum rs_column next_columns[MAX_NEXT_COLUMNS];
149 allow_column_func_t checks[MAX_COLUMN_CHECKS];
150 };
151
152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
153 struct iwl_scale_tbl_info *tbl,
154 const struct rs_tx_column *next_col)
155 {
156 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
157 }
158
159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
160 struct iwl_scale_tbl_info *tbl,
161 const struct rs_tx_column *next_col)
162 {
163 if (!sta->ht_cap.ht_supported)
164 return false;
165
166 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
167 return false;
168
169 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
170 return false;
171
172 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
173 return false;
174
175 return true;
176 }
177
178 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
179 struct iwl_scale_tbl_info *tbl,
180 const struct rs_tx_column *next_col)
181 {
182 if (!sta->ht_cap.ht_supported)
183 return false;
184
185 return true;
186 }
187
188 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
189 struct iwl_scale_tbl_info *tbl,
190 const struct rs_tx_column *next_col)
191 {
192 struct rs_rate *rate = &tbl->rate;
193 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
194 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
195
196 if (is_ht20(rate) && (ht_cap->cap &
197 IEEE80211_HT_CAP_SGI_20))
198 return true;
199 if (is_ht40(rate) && (ht_cap->cap &
200 IEEE80211_HT_CAP_SGI_40))
201 return true;
202 if (is_ht80(rate) && (vht_cap->cap &
203 IEEE80211_VHT_CAP_SHORT_GI_80))
204 return true;
205
206 return false;
207 }
208
209 static const struct rs_tx_column rs_tx_columns[] = {
210 [RS_COLUMN_LEGACY_ANT_A] = {
211 .mode = RS_LEGACY,
212 .ant = ANT_A,
213 .next_columns = {
214 RS_COLUMN_LEGACY_ANT_B,
215 RS_COLUMN_SISO_ANT_A,
216 RS_COLUMN_MIMO2,
217 RS_COLUMN_INVALID,
218 RS_COLUMN_INVALID,
219 RS_COLUMN_INVALID,
220 RS_COLUMN_INVALID,
221 },
222 .checks = {
223 rs_ant_allow,
224 },
225 },
226 [RS_COLUMN_LEGACY_ANT_B] = {
227 .mode = RS_LEGACY,
228 .ant = ANT_B,
229 .next_columns = {
230 RS_COLUMN_LEGACY_ANT_A,
231 RS_COLUMN_SISO_ANT_B,
232 RS_COLUMN_MIMO2,
233 RS_COLUMN_INVALID,
234 RS_COLUMN_INVALID,
235 RS_COLUMN_INVALID,
236 RS_COLUMN_INVALID,
237 },
238 .checks = {
239 rs_ant_allow,
240 },
241 },
242 [RS_COLUMN_SISO_ANT_A] = {
243 .mode = RS_SISO,
244 .ant = ANT_A,
245 .next_columns = {
246 RS_COLUMN_SISO_ANT_B,
247 RS_COLUMN_MIMO2,
248 RS_COLUMN_SISO_ANT_A_SGI,
249 RS_COLUMN_LEGACY_ANT_A,
250 RS_COLUMN_LEGACY_ANT_B,
251 RS_COLUMN_INVALID,
252 RS_COLUMN_INVALID,
253 },
254 .checks = {
255 rs_siso_allow,
256 rs_ant_allow,
257 },
258 },
259 [RS_COLUMN_SISO_ANT_B] = {
260 .mode = RS_SISO,
261 .ant = ANT_B,
262 .next_columns = {
263 RS_COLUMN_SISO_ANT_A,
264 RS_COLUMN_MIMO2,
265 RS_COLUMN_SISO_ANT_B_SGI,
266 RS_COLUMN_LEGACY_ANT_A,
267 RS_COLUMN_LEGACY_ANT_B,
268 RS_COLUMN_INVALID,
269 RS_COLUMN_INVALID,
270 },
271 .checks = {
272 rs_siso_allow,
273 rs_ant_allow,
274 },
275 },
276 [RS_COLUMN_SISO_ANT_A_SGI] = {
277 .mode = RS_SISO,
278 .ant = ANT_A,
279 .sgi = true,
280 .next_columns = {
281 RS_COLUMN_SISO_ANT_B_SGI,
282 RS_COLUMN_MIMO2_SGI,
283 RS_COLUMN_SISO_ANT_A,
284 RS_COLUMN_LEGACY_ANT_A,
285 RS_COLUMN_LEGACY_ANT_B,
286 RS_COLUMN_INVALID,
287 RS_COLUMN_INVALID,
288 },
289 .checks = {
290 rs_siso_allow,
291 rs_ant_allow,
292 rs_sgi_allow,
293 },
294 },
295 [RS_COLUMN_SISO_ANT_B_SGI] = {
296 .mode = RS_SISO,
297 .ant = ANT_B,
298 .sgi = true,
299 .next_columns = {
300 RS_COLUMN_SISO_ANT_A_SGI,
301 RS_COLUMN_MIMO2_SGI,
302 RS_COLUMN_SISO_ANT_B,
303 RS_COLUMN_LEGACY_ANT_A,
304 RS_COLUMN_LEGACY_ANT_B,
305 RS_COLUMN_INVALID,
306 RS_COLUMN_INVALID,
307 },
308 .checks = {
309 rs_siso_allow,
310 rs_ant_allow,
311 rs_sgi_allow,
312 },
313 },
314 [RS_COLUMN_MIMO2] = {
315 .mode = RS_MIMO2,
316 .ant = ANT_AB,
317 .next_columns = {
318 RS_COLUMN_SISO_ANT_A,
319 RS_COLUMN_MIMO2_SGI,
320 RS_COLUMN_LEGACY_ANT_A,
321 RS_COLUMN_LEGACY_ANT_B,
322 RS_COLUMN_INVALID,
323 RS_COLUMN_INVALID,
324 RS_COLUMN_INVALID,
325 },
326 .checks = {
327 rs_mimo_allow,
328 },
329 },
330 [RS_COLUMN_MIMO2_SGI] = {
331 .mode = RS_MIMO2,
332 .ant = ANT_AB,
333 .sgi = true,
334 .next_columns = {
335 RS_COLUMN_SISO_ANT_A_SGI,
336 RS_COLUMN_MIMO2,
337 RS_COLUMN_LEGACY_ANT_A,
338 RS_COLUMN_LEGACY_ANT_B,
339 RS_COLUMN_INVALID,
340 RS_COLUMN_INVALID,
341 RS_COLUMN_INVALID,
342 },
343 .checks = {
344 rs_mimo_allow,
345 rs_sgi_allow,
346 },
347 },
348 };
349
350 static inline u8 rs_extract_rate(u32 rate_n_flags)
351 {
352 /* also works for HT because bits 7:6 are zero there */
353 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
354 }
355
356 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
357 {
358 int idx = 0;
359
360 if (rate_n_flags & RATE_MCS_HT_MSK) {
361 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
362 idx += IWL_RATE_MCS_0_INDEX;
363
364 /* skip 9M not supported in HT*/
365 if (idx >= IWL_RATE_9M_INDEX)
366 idx += 1;
367 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
368 return idx;
369 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
370 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
371 idx += IWL_RATE_MCS_0_INDEX;
372
373 /* skip 9M not supported in VHT*/
374 if (idx >= IWL_RATE_9M_INDEX)
375 idx++;
376 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
377 return idx;
378 } else {
379 /* legacy rate format, search for match in table */
380
381 u8 legacy_rate = rs_extract_rate(rate_n_flags);
382 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
383 if (iwl_rates[idx].plcp == legacy_rate)
384 return idx;
385 }
386
387 return IWL_RATE_INVALID;
388 }
389
390 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
391 struct ieee80211_sta *sta,
392 struct iwl_lq_sta *lq_sta,
393 int tid);
394 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
395 struct ieee80211_sta *sta,
396 struct iwl_lq_sta *lq_sta,
397 const struct rs_rate *initial_rate);
398 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
399
400 /**
401 * The following tables contain the expected throughput metrics for all rates
402 *
403 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
404 *
405 * where invalid entries are zeros.
406 *
407 * CCK rates are only valid in legacy table and will only be used in G
408 * (2.4 GHz) band.
409 */
410
411 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
412 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
413 };
414
415 /* Expected TpT tables. 4 indexes:
416 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
417 */
418 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
419 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
420 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
421 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
422 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
423 };
424
425 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
426 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
427 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
428 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
429 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
430 };
431
432 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
433 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
434 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
435 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
436 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
437 };
438
439 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
440 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
441 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
442 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
443 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
444 };
445
446 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
447 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
448 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
449 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
450 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
451 };
452
453 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
454 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
455 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
456 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
457 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
458 };
459
460 /* mbps, mcs */
461 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
462 { "1", "BPSK DSSS"},
463 { "2", "QPSK DSSS"},
464 {"5.5", "BPSK CCK"},
465 { "11", "QPSK CCK"},
466 { "6", "BPSK 1/2"},
467 { "9", "BPSK 1/2"},
468 { "12", "QPSK 1/2"},
469 { "18", "QPSK 3/4"},
470 { "24", "16QAM 1/2"},
471 { "36", "16QAM 3/4"},
472 { "48", "64QAM 2/3"},
473 { "54", "64QAM 3/4"},
474 { "60", "64QAM 5/6"},
475 };
476
477 #define MCS_INDEX_PER_STREAM (8)
478
479 static const char *rs_pretty_ant(u8 ant)
480 {
481 static const char * const ant_name[] = {
482 [ANT_NONE] = "None",
483 [ANT_A] = "A",
484 [ANT_B] = "B",
485 [ANT_AB] = "AB",
486 [ANT_C] = "C",
487 [ANT_AC] = "AC",
488 [ANT_BC] = "BC",
489 [ANT_ABC] = "ABC",
490 };
491
492 if (ant > ANT_ABC)
493 return "UNKNOWN";
494
495 return ant_name[ant];
496 }
497
498 static const char *rs_pretty_lq_type(enum iwl_table_type type)
499 {
500 static const char * const lq_types[] = {
501 [LQ_NONE] = "NONE",
502 [LQ_LEGACY_A] = "LEGACY_A",
503 [LQ_LEGACY_G] = "LEGACY_G",
504 [LQ_HT_SISO] = "HT SISO",
505 [LQ_HT_MIMO2] = "HT MIMO",
506 [LQ_VHT_SISO] = "VHT SISO",
507 [LQ_VHT_MIMO2] = "VHT MIMO",
508 };
509
510 if (type < LQ_NONE || type >= LQ_MAX)
511 return "UNKNOWN";
512
513 return lq_types[type];
514 }
515
516 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
517 const char *prefix)
518 {
519 IWL_DEBUG_RATE(mvm,
520 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
521 prefix, rs_pretty_lq_type(rate->type),
522 rate->index, rs_pretty_ant(rate->ant),
523 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
524 }
525
526 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
527 {
528 window->data = 0;
529 window->success_counter = 0;
530 window->success_ratio = IWL_INVALID_VALUE;
531 window->counter = 0;
532 window->average_tpt = IWL_INVALID_VALUE;
533 }
534
535 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
536 struct iwl_scale_tbl_info *tbl)
537 {
538 int i;
539
540 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
541 for (i = 0; i < IWL_RATE_COUNT; i++)
542 rs_rate_scale_clear_window(&tbl->win[i]);
543
544 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
545 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
546 }
547
548 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
549 {
550 return (ant_type & valid_antenna) == ant_type;
551 }
552
553 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
554 struct iwl_lq_sta *lq_data, u8 tid,
555 struct ieee80211_sta *sta)
556 {
557 int ret = -EAGAIN;
558
559 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
560 sta->addr, tid);
561 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
562 if (ret == -EAGAIN) {
563 /*
564 * driver and mac80211 is out of sync
565 * this might be cause by reloading firmware
566 * stop the tx ba session here
567 */
568 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
569 tid);
570 ieee80211_stop_tx_ba_session(sta, tid);
571 }
572 return ret;
573 }
574
575 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
576 struct iwl_lq_sta *lq_data,
577 struct ieee80211_sta *sta)
578 {
579 if (tid < IWL_MAX_TID_COUNT)
580 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
581 else
582 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
583 tid, IWL_MAX_TID_COUNT);
584 }
585
586 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
587 {
588 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
589 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
590 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
591 }
592
593 /*
594 * Static function to get the expected throughput from an iwl_scale_tbl_info
595 * that wraps a NULL pointer check
596 */
597 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
598 {
599 if (tbl->expected_tpt)
600 return tbl->expected_tpt[rs_index];
601 return 0;
602 }
603
604 /**
605 * rs_collect_tx_data - Update the success/failure sliding window
606 *
607 * We keep a sliding window of the last 62 packets transmitted
608 * at this rate. window->data contains the bitmask of successful
609 * packets.
610 */
611 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
612 struct iwl_scale_tbl_info *tbl,
613 int scale_index, int attempts, int successes,
614 struct iwl_rate_scale_data *window)
615 {
616 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
617 s32 fail_count, tpt;
618
619 /* Get expected throughput */
620 tpt = get_expected_tpt(tbl, scale_index);
621
622 /*
623 * Keep track of only the latest 62 tx frame attempts in this rate's
624 * history window; anything older isn't really relevant any more.
625 * If we have filled up the sliding window, drop the oldest attempt;
626 * if the oldest attempt (highest bit in bitmap) shows "success",
627 * subtract "1" from the success counter (this is the main reason
628 * we keep these bitmaps!).
629 */
630 while (attempts > 0) {
631 if (window->counter >= IWL_RATE_MAX_WINDOW) {
632 /* remove earliest */
633 window->counter = IWL_RATE_MAX_WINDOW - 1;
634
635 if (window->data & mask) {
636 window->data &= ~mask;
637 window->success_counter--;
638 }
639 }
640
641 /* Increment frames-attempted counter */
642 window->counter++;
643
644 /* Shift bitmap by one frame to throw away oldest history */
645 window->data <<= 1;
646
647 /* Mark the most recent #successes attempts as successful */
648 if (successes > 0) {
649 window->success_counter++;
650 window->data |= 0x1;
651 successes--;
652 }
653
654 attempts--;
655 }
656
657 /* Calculate current success ratio, avoid divide-by-0! */
658 if (window->counter > 0)
659 window->success_ratio = 128 * (100 * window->success_counter)
660 / window->counter;
661 else
662 window->success_ratio = IWL_INVALID_VALUE;
663
664 fail_count = window->counter - window->success_counter;
665
666 /* Calculate average throughput, if we have enough history. */
667 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
668 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
669 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
670 else
671 window->average_tpt = IWL_INVALID_VALUE;
672
673 return 0;
674 }
675
676 static int rs_collect_tx_data(struct iwl_mvm *mvm,
677 struct iwl_lq_sta *lq_sta,
678 struct iwl_scale_tbl_info *tbl,
679 int scale_index, int attempts, int successes,
680 u8 reduced_txp)
681 {
682 struct iwl_rate_scale_data *window = NULL;
683 int ret;
684
685 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
686 return -EINVAL;
687
688 if (tbl->column != RS_COLUMN_INVALID) {
689 struct lq_sta_pers *pers = &lq_sta->pers;
690
691 pers->tx_stats[tbl->column][scale_index].total += attempts;
692 pers->tx_stats[tbl->column][scale_index].success += successes;
693 }
694
695 /* Select window for current tx bit rate */
696 window = &(tbl->win[scale_index]);
697
698 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
699 window);
700 if (ret)
701 return ret;
702
703 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
704 return -EINVAL;
705
706 window = &tbl->tpc_win[reduced_txp];
707 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
708 window);
709 }
710
711 /* Convert rs_rate object into ucode rate bitmask */
712 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
713 struct rs_rate *rate)
714 {
715 u32 ucode_rate = 0;
716 int index = rate->index;
717
718 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
719 RATE_MCS_ANT_ABC_MSK);
720
721 if (is_legacy(rate)) {
722 ucode_rate |= iwl_rates[index].plcp;
723 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
724 ucode_rate |= RATE_MCS_CCK_MSK;
725 return ucode_rate;
726 }
727
728 if (is_ht(rate)) {
729 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
730 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
731 index = IWL_LAST_HT_RATE;
732 }
733 ucode_rate |= RATE_MCS_HT_MSK;
734
735 if (is_ht_siso(rate))
736 ucode_rate |= iwl_rates[index].plcp_ht_siso;
737 else if (is_ht_mimo2(rate))
738 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
739 else
740 WARN_ON_ONCE(1);
741 } else if (is_vht(rate)) {
742 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
743 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
744 index = IWL_LAST_VHT_RATE;
745 }
746 ucode_rate |= RATE_MCS_VHT_MSK;
747 if (is_vht_siso(rate))
748 ucode_rate |= iwl_rates[index].plcp_vht_siso;
749 else if (is_vht_mimo2(rate))
750 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
751 else
752 WARN_ON_ONCE(1);
753
754 } else {
755 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
756 }
757
758 if (is_siso(rate) && rate->stbc) {
759 /* To enable STBC we need to set both a flag and ANT_AB */
760 ucode_rate |= RATE_MCS_ANT_AB_MSK;
761 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
762 }
763
764 ucode_rate |= rate->bw;
765 if (rate->sgi)
766 ucode_rate |= RATE_MCS_SGI_MSK;
767 if (rate->ldpc)
768 ucode_rate |= RATE_MCS_LDPC_MSK;
769
770 return ucode_rate;
771 }
772
773 /* Convert a ucode rate into an rs_rate object */
774 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
775 enum ieee80211_band band,
776 struct rs_rate *rate)
777 {
778 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
779 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
780 u8 nss;
781
782 memset(rate, 0, sizeof(*rate));
783 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
784
785 if (rate->index == IWL_RATE_INVALID)
786 return -EINVAL;
787
788 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
789
790 /* Legacy */
791 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
792 !(ucode_rate & RATE_MCS_VHT_MSK)) {
793 if (num_of_ant == 1) {
794 if (band == IEEE80211_BAND_5GHZ)
795 rate->type = LQ_LEGACY_A;
796 else
797 rate->type = LQ_LEGACY_G;
798 }
799
800 return 0;
801 }
802
803 /* HT or VHT */
804 if (ucode_rate & RATE_MCS_SGI_MSK)
805 rate->sgi = true;
806 if (ucode_rate & RATE_MCS_LDPC_MSK)
807 rate->ldpc = true;
808 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
809 rate->stbc = true;
810
811 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
812
813 if (ucode_rate & RATE_MCS_HT_MSK) {
814 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
815 RATE_HT_MCS_NSS_POS) + 1;
816
817 if (nss == 1) {
818 rate->type = LQ_HT_SISO;
819 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
820 } else if (nss == 2) {
821 rate->type = LQ_HT_MIMO2;
822 WARN_ON_ONCE(num_of_ant != 2);
823 } else {
824 WARN_ON_ONCE(1);
825 }
826 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
827 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
828 RATE_VHT_MCS_NSS_POS) + 1;
829
830 if (nss == 1) {
831 rate->type = LQ_VHT_SISO;
832 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
833 } else if (nss == 2) {
834 rate->type = LQ_VHT_MIMO2;
835 WARN_ON_ONCE(num_of_ant != 2);
836 } else {
837 WARN_ON_ONCE(1);
838 }
839 }
840
841 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
842 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
843 !is_vht(rate));
844
845 return 0;
846 }
847
848 /* switch to another antenna/antennas and return 1 */
849 /* if no other valid antenna found, return 0 */
850 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
851 {
852 u8 new_ant_type;
853
854 if (!rate->ant || rate->ant > ANT_ABC)
855 return 0;
856
857 if (!rs_is_valid_ant(valid_ant, rate->ant))
858 return 0;
859
860 new_ant_type = ant_toggle_lookup[rate->ant];
861
862 while ((new_ant_type != rate->ant) &&
863 !rs_is_valid_ant(valid_ant, new_ant_type))
864 new_ant_type = ant_toggle_lookup[new_ant_type];
865
866 if (new_ant_type == rate->ant)
867 return 0;
868
869 rate->ant = new_ant_type;
870
871 return 1;
872 }
873
874 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
875 struct rs_rate *rate)
876 {
877 if (is_legacy(rate))
878 return lq_sta->active_legacy_rate;
879 else if (is_siso(rate))
880 return lq_sta->active_siso_rate;
881 else if (is_mimo2(rate))
882 return lq_sta->active_mimo2_rate;
883
884 WARN_ON_ONCE(1);
885 return 0;
886 }
887
888 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
889 int rate_type)
890 {
891 u8 high = IWL_RATE_INVALID;
892 u8 low = IWL_RATE_INVALID;
893
894 /* 802.11A or ht walks to the next literal adjacent rate in
895 * the rate table */
896 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
897 int i;
898 u32 mask;
899
900 /* Find the previous rate that is in the rate mask */
901 i = index - 1;
902 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
903 if (rate_mask & mask) {
904 low = i;
905 break;
906 }
907 }
908
909 /* Find the next rate that is in the rate mask */
910 i = index + 1;
911 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
912 if (rate_mask & mask) {
913 high = i;
914 break;
915 }
916 }
917
918 return (high << 8) | low;
919 }
920
921 low = index;
922 while (low != IWL_RATE_INVALID) {
923 low = iwl_rates[low].prev_rs;
924 if (low == IWL_RATE_INVALID)
925 break;
926 if (rate_mask & (1 << low))
927 break;
928 }
929
930 high = index;
931 while (high != IWL_RATE_INVALID) {
932 high = iwl_rates[high].next_rs;
933 if (high == IWL_RATE_INVALID)
934 break;
935 if (rate_mask & (1 << high))
936 break;
937 }
938
939 return (high << 8) | low;
940 }
941
942 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
943 struct rs_rate *rate)
944 {
945 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
946 }
947
948 /* Get the next supported lower rate in the current column.
949 * Return true if bottom rate in the current column was reached
950 */
951 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
952 struct rs_rate *rate)
953 {
954 u8 low;
955 u16 high_low;
956 u16 rate_mask;
957 struct iwl_mvm *mvm = lq_sta->pers.drv;
958
959 rate_mask = rs_get_supported_rates(lq_sta, rate);
960 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
961 rate->type);
962 low = high_low & 0xff;
963
964 /* Bottom rate of column reached */
965 if (low == IWL_RATE_INVALID)
966 return true;
967
968 rate->index = low;
969 return false;
970 }
971
972 /* Get the next rate to use following a column downgrade */
973 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
974 struct rs_rate *rate)
975 {
976 struct iwl_mvm *mvm = lq_sta->pers.drv;
977
978 if (is_legacy(rate)) {
979 /* No column to downgrade from Legacy */
980 return;
981 } else if (is_siso(rate)) {
982 /* Downgrade to Legacy if we were in SISO */
983 if (lq_sta->band == IEEE80211_BAND_5GHZ)
984 rate->type = LQ_LEGACY_A;
985 else
986 rate->type = LQ_LEGACY_G;
987
988 rate->bw = RATE_MCS_CHAN_WIDTH_20;
989
990 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
991 rate->index > IWL_RATE_MCS_9_INDEX);
992
993 rate->index = rs_ht_to_legacy[rate->index];
994 rate->ldpc = false;
995 } else {
996 /* Downgrade to SISO with same MCS if in MIMO */
997 rate->type = is_vht_mimo2(rate) ?
998 LQ_VHT_SISO : LQ_HT_SISO;
999 }
1000
1001 if (num_of_ant(rate->ant) > 1)
1002 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1003
1004 /* Relevant in both switching to SISO or Legacy */
1005 rate->sgi = false;
1006
1007 if (!rs_rate_supported(lq_sta, rate))
1008 rs_get_lower_rate_in_column(lq_sta, rate);
1009 }
1010
1011 /* Simple function to compare two rate scale table types */
1012 static inline bool rs_rate_match(struct rs_rate *a,
1013 struct rs_rate *b)
1014 {
1015 bool ant_match;
1016
1017 if (a->stbc)
1018 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1019 else
1020 ant_match = (a->ant == b->ant);
1021
1022 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1023 && ant_match;
1024 }
1025
1026 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1027 {
1028 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1029 return RATE_MCS_CHAN_WIDTH_40;
1030 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1031 return RATE_MCS_CHAN_WIDTH_80;
1032 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1033 return RATE_MCS_CHAN_WIDTH_160;
1034
1035 return RATE_MCS_CHAN_WIDTH_20;
1036 }
1037
1038 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1039 {
1040 u8 tid = IWL_MAX_TID_COUNT;
1041
1042 if (ieee80211_is_data_qos(hdr->frame_control)) {
1043 u8 *qc = ieee80211_get_qos_ctl(hdr);
1044 tid = qc[0] & 0xf;
1045 }
1046
1047 if (unlikely(tid > IWL_MAX_TID_COUNT))
1048 tid = IWL_MAX_TID_COUNT;
1049
1050 return tid;
1051 }
1052
1053 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1054 int tid, struct ieee80211_tx_info *info)
1055 {
1056 int legacy_success;
1057 int retries;
1058 int mac_index, i;
1059 struct iwl_lq_cmd *table;
1060 enum mac80211_rate_control_flags mac_flags;
1061 u32 ucode_rate;
1062 struct rs_rate rate;
1063 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1064 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1065 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1066 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1067
1068 /* Treat uninitialized rate scaling data same as non-existing. */
1069 if (!lq_sta) {
1070 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1071 return;
1072 } else if (!lq_sta->pers.drv) {
1073 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1074 return;
1075 }
1076
1077 #ifdef CONFIG_MAC80211_DEBUGFS
1078 /* Disable last tx check if we are debugging with fixed rate */
1079 if (lq_sta->pers.dbg_fixed_rate) {
1080 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1081 return;
1082 }
1083 #endif
1084 /* This packet was aggregated but doesn't carry status info */
1085 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1086 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1087 return;
1088
1089 /*
1090 * Ignore this Tx frame response if its initial rate doesn't match
1091 * that of latest Link Quality command. There may be stragglers
1092 * from a previous Link Quality command, but we're no longer interested
1093 * in those; they're either from the "active" mode while we're trying
1094 * to check "search" mode, or a prior "search" mode after we've moved
1095 * to a new "search" mode (which might become the new "active" mode).
1096 */
1097 table = &lq_sta->lq;
1098 ucode_rate = le32_to_cpu(table->rs_table[0]);
1099 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1100 if (info->band == IEEE80211_BAND_5GHZ)
1101 rate.index -= IWL_FIRST_OFDM_RATE;
1102 mac_flags = info->status.rates[0].flags;
1103 mac_index = info->status.rates[0].idx;
1104 /* For HT packets, map MCS to PLCP */
1105 if (mac_flags & IEEE80211_TX_RC_MCS) {
1106 /* Remove # of streams */
1107 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1108 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1109 mac_index++;
1110 /*
1111 * mac80211 HT index is always zero-indexed; we need to move
1112 * HT OFDM rates after CCK rates in 2.4 GHz band
1113 */
1114 if (info->band == IEEE80211_BAND_2GHZ)
1115 mac_index += IWL_FIRST_OFDM_RATE;
1116 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1117 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1118 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1119 mac_index++;
1120 }
1121
1122 if (time_after(jiffies,
1123 (unsigned long)(lq_sta->last_tx +
1124 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1125 int t;
1126
1127 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1128 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1129 ieee80211_stop_tx_ba_session(sta, t);
1130
1131 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1132 return;
1133 }
1134 lq_sta->last_tx = jiffies;
1135
1136 /* Here we actually compare this rate to the latest LQ command */
1137 if ((mac_index < 0) ||
1138 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1139 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1140 (rate.ant != info->status.antenna) ||
1141 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1142 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1143 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1144 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1145 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1146 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1147 (rate.index != mac_index)) {
1148 IWL_DEBUG_RATE(mvm,
1149 "initial rate %d does not match %d (0x%x)\n",
1150 mac_index, rate.index, ucode_rate);
1151 /*
1152 * Since rates mis-match, the last LQ command may have failed.
1153 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1154 * ... driver.
1155 */
1156 lq_sta->missed_rate_counter++;
1157 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1158 lq_sta->missed_rate_counter = 0;
1159 IWL_DEBUG_RATE(mvm,
1160 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1161 lq_sta->rs_state);
1162 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1163 }
1164 /* Regardless, ignore this status info for outdated rate */
1165 return;
1166 } else
1167 /* Rate did match, so reset the missed_rate_counter */
1168 lq_sta->missed_rate_counter = 0;
1169
1170 if (!lq_sta->search_better_tbl) {
1171 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1172 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1173 } else {
1174 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1175 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1176 }
1177
1178 if (WARN_ON_ONCE(!rs_rate_match(&rate, &curr_tbl->rate))) {
1179 IWL_DEBUG_RATE(mvm,
1180 "Neither active nor search matches tx rate\n");
1181 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1182 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1183 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1184 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1185 rs_dump_rate(mvm, &rate, "ACTUAL");
1186
1187 /*
1188 * no matching table found, let's by-pass the data collection
1189 * and continue to perform rate scale to find the rate table
1190 */
1191 rs_stay_in_table(lq_sta, true);
1192 goto done;
1193 }
1194
1195 /*
1196 * Updating the frame history depends on whether packets were
1197 * aggregated.
1198 *
1199 * For aggregation, all packets were transmitted at the same rate, the
1200 * first index into rate scale table.
1201 */
1202 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1203 /* ampdu_ack_len = 0 marks no BA was received. In this case
1204 * treat it as a single frame loss as we don't want the success
1205 * ratio to dip too quickly because a BA wasn't received
1206 */
1207 if (info->status.ampdu_ack_len == 0)
1208 info->status.ampdu_len = 1;
1209
1210 ucode_rate = le32_to_cpu(table->rs_table[0]);
1211 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1212 rs_collect_tx_data(mvm, lq_sta, curr_tbl, rate.index,
1213 info->status.ampdu_len,
1214 info->status.ampdu_ack_len,
1215 reduced_txp);
1216
1217 /* Update success/fail counts if not searching for new mode */
1218 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1219 lq_sta->total_success += info->status.ampdu_ack_len;
1220 lq_sta->total_failed += (info->status.ampdu_len -
1221 info->status.ampdu_ack_len);
1222 }
1223 } else {
1224 /*
1225 * For legacy, update frame history with for each Tx retry.
1226 */
1227 retries = info->status.rates[0].count - 1;
1228 /* HW doesn't send more than 15 retries */
1229 retries = min(retries, 15);
1230
1231 /* The last transmission may have been successful */
1232 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1233 /* Collect data for each rate used during failed TX attempts */
1234 for (i = 0; i <= retries; ++i) {
1235 ucode_rate = le32_to_cpu(table->rs_table[i]);
1236 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1237 /*
1238 * Only collect stats if retried rate is in the same RS
1239 * table as active/search.
1240 */
1241 if (rs_rate_match(&rate, &curr_tbl->rate))
1242 tmp_tbl = curr_tbl;
1243 else if (rs_rate_match(&rate, &other_tbl->rate))
1244 tmp_tbl = other_tbl;
1245 else
1246 continue;
1247
1248 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, rate.index, 1,
1249 i < retries ? 0 : legacy_success,
1250 reduced_txp);
1251 }
1252
1253 /* Update success/fail counts if not searching for new mode */
1254 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1255 lq_sta->total_success += legacy_success;
1256 lq_sta->total_failed += retries + (1 - legacy_success);
1257 }
1258 }
1259 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1260 lq_sta->last_rate_n_flags = ucode_rate;
1261 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1262 done:
1263 /* See if there's a better rate or modulation mode to try. */
1264 if (sta->supp_rates[info->band])
1265 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1266 }
1267
1268 /*
1269 * mac80211 sends us Tx status
1270 */
1271 static void rs_mac80211_tx_status(void *mvm_r,
1272 struct ieee80211_supported_band *sband,
1273 struct ieee80211_sta *sta, void *priv_sta,
1274 struct sk_buff *skb)
1275 {
1276 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1277 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1278 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1279 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1280
1281 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1282 return;
1283
1284 if (!ieee80211_is_data(hdr->frame_control) ||
1285 info->flags & IEEE80211_TX_CTL_NO_ACK)
1286 return;
1287
1288 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1289 }
1290
1291 /*
1292 * Begin a period of staying with a selected modulation mode.
1293 * Set "stay_in_tbl" flag to prevent any mode switches.
1294 * Set frame tx success limits according to legacy vs. high-throughput,
1295 * and reset overall (spanning all rates) tx success history statistics.
1296 * These control how long we stay using same modulation mode before
1297 * searching for a new mode.
1298 */
1299 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1300 struct iwl_lq_sta *lq_sta)
1301 {
1302 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1303 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1304 if (is_legacy) {
1305 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1306 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1307 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1308 } else {
1309 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1310 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1311 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1312 }
1313 lq_sta->table_count = 0;
1314 lq_sta->total_failed = 0;
1315 lq_sta->total_success = 0;
1316 lq_sta->flush_timer = jiffies;
1317 lq_sta->visited_columns = 0;
1318 }
1319
1320 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1321 {
1322 if (rate_mask)
1323 return find_last_bit(&rate_mask, BITS_PER_LONG);
1324 return IWL_RATE_INVALID;
1325 }
1326
1327 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1328 const struct rs_tx_column *column)
1329 {
1330 switch (column->mode) {
1331 case RS_LEGACY:
1332 return lq_sta->max_legacy_rate_idx;
1333 case RS_SISO:
1334 return lq_sta->max_siso_rate_idx;
1335 case RS_MIMO2:
1336 return lq_sta->max_mimo2_rate_idx;
1337 default:
1338 WARN_ON_ONCE(1);
1339 }
1340
1341 return lq_sta->max_legacy_rate_idx;
1342 }
1343
1344 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1345 const struct rs_tx_column *column,
1346 u32 bw)
1347 {
1348 /* Used to choose among HT tables */
1349 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1350
1351 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1352 column->mode != RS_SISO &&
1353 column->mode != RS_MIMO2))
1354 return expected_tpt_legacy;
1355
1356 /* Legacy rates have only one table */
1357 if (column->mode == RS_LEGACY)
1358 return expected_tpt_legacy;
1359
1360 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1361 /* Choose among many HT tables depending on number of streams
1362 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1363 * status */
1364 if (column->mode == RS_SISO) {
1365 switch (bw) {
1366 case RATE_MCS_CHAN_WIDTH_20:
1367 ht_tbl_pointer = expected_tpt_siso_20MHz;
1368 break;
1369 case RATE_MCS_CHAN_WIDTH_40:
1370 ht_tbl_pointer = expected_tpt_siso_40MHz;
1371 break;
1372 case RATE_MCS_CHAN_WIDTH_80:
1373 ht_tbl_pointer = expected_tpt_siso_80MHz;
1374 break;
1375 default:
1376 WARN_ON_ONCE(1);
1377 }
1378 } else if (column->mode == RS_MIMO2) {
1379 switch (bw) {
1380 case RATE_MCS_CHAN_WIDTH_20:
1381 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1382 break;
1383 case RATE_MCS_CHAN_WIDTH_40:
1384 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1385 break;
1386 case RATE_MCS_CHAN_WIDTH_80:
1387 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1388 break;
1389 default:
1390 WARN_ON_ONCE(1);
1391 }
1392 } else {
1393 WARN_ON_ONCE(1);
1394 }
1395
1396 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1397 return ht_tbl_pointer[0];
1398 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1399 return ht_tbl_pointer[1];
1400 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1401 return ht_tbl_pointer[2];
1402 else /* AGG+SGI */
1403 return ht_tbl_pointer[3];
1404 }
1405
1406 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1407 struct iwl_scale_tbl_info *tbl)
1408 {
1409 struct rs_rate *rate = &tbl->rate;
1410 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1411
1412 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1413 }
1414
1415 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1416 struct iwl_lq_sta *lq_sta,
1417 struct iwl_scale_tbl_info *tbl, /* "search" */
1418 unsigned long rate_mask, s8 index)
1419 {
1420 struct iwl_scale_tbl_info *active_tbl =
1421 &(lq_sta->lq_info[lq_sta->active_tbl]);
1422 s32 success_ratio = active_tbl->win[index].success_ratio;
1423 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1424 const u16 *tpt_tbl = tbl->expected_tpt;
1425 u16 high_low;
1426 u32 target_tpt;
1427 int rate_idx;
1428
1429 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1430 target_tpt = 100 * expected_current_tpt;
1431 IWL_DEBUG_RATE(mvm,
1432 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1433 success_ratio, target_tpt);
1434 } else {
1435 target_tpt = lq_sta->last_tpt;
1436 IWL_DEBUG_RATE(mvm,
1437 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1438 success_ratio, target_tpt);
1439 }
1440
1441 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1442
1443 while (rate_idx != IWL_RATE_INVALID) {
1444 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1445 break;
1446
1447 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1448 tbl->rate.type);
1449
1450 rate_idx = (high_low >> 8) & 0xff;
1451 }
1452
1453 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1454 rate_idx, target_tpt,
1455 rate_idx != IWL_RATE_INVALID ?
1456 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1457
1458 return rate_idx;
1459 }
1460
1461 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1462 {
1463 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1464 return RATE_MCS_CHAN_WIDTH_80;
1465 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1466 return RATE_MCS_CHAN_WIDTH_40;
1467
1468 return RATE_MCS_CHAN_WIDTH_20;
1469 }
1470
1471 /*
1472 * Check whether we should continue using same modulation mode, or
1473 * begin search for a new mode, based on:
1474 * 1) # tx successes or failures while using this mode
1475 * 2) # times calling this function
1476 * 3) elapsed time in this mode (not used, for now)
1477 */
1478 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1479 {
1480 struct iwl_scale_tbl_info *tbl;
1481 int active_tbl;
1482 int flush_interval_passed = 0;
1483 struct iwl_mvm *mvm;
1484
1485 mvm = lq_sta->pers.drv;
1486 active_tbl = lq_sta->active_tbl;
1487
1488 tbl = &(lq_sta->lq_info[active_tbl]);
1489
1490 /* If we've been disallowing search, see if we should now allow it */
1491 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1492 /* Elapsed time using current modulation mode */
1493 if (lq_sta->flush_timer)
1494 flush_interval_passed =
1495 time_after(jiffies,
1496 (unsigned long)(lq_sta->flush_timer +
1497 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1498
1499 /*
1500 * Check if we should allow search for new modulation mode.
1501 * If many frames have failed or succeeded, or we've used
1502 * this same modulation for a long time, allow search, and
1503 * reset history stats that keep track of whether we should
1504 * allow a new search. Also (below) reset all bitmaps and
1505 * stats in active history.
1506 */
1507 if (force_search ||
1508 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1509 (lq_sta->total_success > lq_sta->max_success_limit) ||
1510 ((!lq_sta->search_better_tbl) &&
1511 (lq_sta->flush_timer) && (flush_interval_passed))) {
1512 IWL_DEBUG_RATE(mvm,
1513 "LQ: stay is expired %d %d %d\n",
1514 lq_sta->total_failed,
1515 lq_sta->total_success,
1516 flush_interval_passed);
1517
1518 /* Allow search for new mode */
1519 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1520 IWL_DEBUG_RATE(mvm,
1521 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1522 lq_sta->total_failed = 0;
1523 lq_sta->total_success = 0;
1524 lq_sta->flush_timer = 0;
1525 /* mark the current column as visited */
1526 lq_sta->visited_columns = BIT(tbl->column);
1527 /*
1528 * Else if we've used this modulation mode enough repetitions
1529 * (regardless of elapsed time or success/failure), reset
1530 * history bitmaps and rate-specific stats for all rates in
1531 * active table.
1532 */
1533 } else {
1534 lq_sta->table_count++;
1535 if (lq_sta->table_count >=
1536 lq_sta->table_count_limit) {
1537 lq_sta->table_count = 0;
1538
1539 IWL_DEBUG_RATE(mvm,
1540 "LQ: stay in table clear win\n");
1541 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1542 }
1543 }
1544
1545 /* If transitioning to allow "search", reset all history
1546 * bitmaps and stats in active table (this will become the new
1547 * "search" table). */
1548 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1549 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1550 }
1551 }
1552 }
1553
1554 /*
1555 * setup rate table in uCode
1556 */
1557 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1558 struct ieee80211_sta *sta,
1559 struct iwl_lq_sta *lq_sta,
1560 struct rs_rate *rate)
1561 {
1562 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1563 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1564 }
1565
1566 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1567 struct iwl_lq_sta *lq_sta,
1568 struct ieee80211_sta *sta,
1569 struct iwl_scale_tbl_info *tbl)
1570 {
1571 int i, j, max_rate;
1572 enum rs_column next_col_id;
1573 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1574 const struct rs_tx_column *next_col;
1575 allow_column_func_t allow_func;
1576 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1577 const u16 *expected_tpt_tbl;
1578 u16 tpt, max_expected_tpt;
1579
1580 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1581 next_col_id = curr_col->next_columns[i];
1582
1583 if (next_col_id == RS_COLUMN_INVALID)
1584 continue;
1585
1586 if (lq_sta->visited_columns & BIT(next_col_id)) {
1587 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1588 next_col_id);
1589 continue;
1590 }
1591
1592 next_col = &rs_tx_columns[next_col_id];
1593
1594 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1595 IWL_DEBUG_RATE(mvm,
1596 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1597 next_col_id, valid_ants, next_col->ant);
1598 continue;
1599 }
1600
1601 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1602 allow_func = next_col->checks[j];
1603 if (allow_func && !allow_func(mvm, sta, tbl, next_col))
1604 break;
1605 }
1606
1607 if (j != MAX_COLUMN_CHECKS) {
1608 IWL_DEBUG_RATE(mvm,
1609 "Skip column %d: not allowed (check %d failed)\n",
1610 next_col_id, j);
1611
1612 continue;
1613 }
1614
1615 tpt = lq_sta->last_tpt / 100;
1616 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1617 rs_bw_from_sta_bw(sta));
1618 if (WARN_ON_ONCE(!expected_tpt_tbl))
1619 continue;
1620
1621 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1622 if (max_rate == IWL_RATE_INVALID) {
1623 IWL_DEBUG_RATE(mvm,
1624 "Skip column %d: no rate is allowed in this column\n",
1625 next_col_id);
1626 continue;
1627 }
1628
1629 max_expected_tpt = expected_tpt_tbl[max_rate];
1630 if (tpt >= max_expected_tpt) {
1631 IWL_DEBUG_RATE(mvm,
1632 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1633 next_col_id, max_expected_tpt, tpt);
1634 continue;
1635 }
1636
1637 IWL_DEBUG_RATE(mvm,
1638 "Found potential column %d. Max expected %d current %d\n",
1639 next_col_id, max_expected_tpt, tpt);
1640 break;
1641 }
1642
1643 if (i == MAX_NEXT_COLUMNS)
1644 return RS_COLUMN_INVALID;
1645
1646 return next_col_id;
1647 }
1648
1649 static int rs_switch_to_column(struct iwl_mvm *mvm,
1650 struct iwl_lq_sta *lq_sta,
1651 struct ieee80211_sta *sta,
1652 enum rs_column col_id)
1653 {
1654 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1655 struct iwl_scale_tbl_info *search_tbl =
1656 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1657 struct rs_rate *rate = &search_tbl->rate;
1658 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1659 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1660 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1661 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1662 unsigned long rate_mask = 0;
1663 u32 rate_idx = 0;
1664
1665 memcpy(search_tbl, tbl, sz);
1666
1667 rate->sgi = column->sgi;
1668 rate->ant = column->ant;
1669
1670 if (column->mode == RS_LEGACY) {
1671 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1672 rate->type = LQ_LEGACY_A;
1673 else
1674 rate->type = LQ_LEGACY_G;
1675
1676 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1677 rate->ldpc = false;
1678 rate_mask = lq_sta->active_legacy_rate;
1679 } else if (column->mode == RS_SISO) {
1680 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1681 rate_mask = lq_sta->active_siso_rate;
1682 } else if (column->mode == RS_MIMO2) {
1683 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1684 rate_mask = lq_sta->active_mimo2_rate;
1685 } else {
1686 WARN_ON_ONCE("Bad column mode");
1687 }
1688
1689 if (column->mode != RS_LEGACY) {
1690 rate->bw = rs_bw_from_sta_bw(sta);
1691 rate->ldpc = lq_sta->ldpc;
1692 }
1693
1694 search_tbl->column = col_id;
1695 rs_set_expected_tpt_table(lq_sta, search_tbl);
1696
1697 lq_sta->visited_columns |= BIT(col_id);
1698
1699 /* Get the best matching rate if we're changing modes. e.g.
1700 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1701 */
1702 if (curr_column->mode != column->mode) {
1703 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1704 rate_mask, rate->index);
1705
1706 if ((rate_idx == IWL_RATE_INVALID) ||
1707 !(BIT(rate_idx) & rate_mask)) {
1708 IWL_DEBUG_RATE(mvm,
1709 "can not switch with index %d"
1710 " rate mask %lx\n",
1711 rate_idx, rate_mask);
1712
1713 goto err;
1714 }
1715
1716 rate->index = rate_idx;
1717 }
1718
1719 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1720 col_id, rate->index);
1721
1722 return 0;
1723
1724 err:
1725 rate->type = LQ_NONE;
1726 return -1;
1727 }
1728
1729 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1730 struct iwl_scale_tbl_info *tbl,
1731 s32 sr, int low, int high,
1732 int current_tpt,
1733 int low_tpt, int high_tpt)
1734 {
1735 enum rs_action action = RS_ACTION_STAY;
1736
1737 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1738 (current_tpt == 0)) {
1739 IWL_DEBUG_RATE(mvm,
1740 "Decrease rate because of low SR\n");
1741 return RS_ACTION_DOWNSCALE;
1742 }
1743
1744 if ((low_tpt == IWL_INVALID_VALUE) &&
1745 (high_tpt == IWL_INVALID_VALUE) &&
1746 (high != IWL_RATE_INVALID)) {
1747 IWL_DEBUG_RATE(mvm,
1748 "No data about high/low rates. Increase rate\n");
1749 return RS_ACTION_UPSCALE;
1750 }
1751
1752 if ((high_tpt == IWL_INVALID_VALUE) &&
1753 (high != IWL_RATE_INVALID) &&
1754 (low_tpt != IWL_INVALID_VALUE) &&
1755 (low_tpt < current_tpt)) {
1756 IWL_DEBUG_RATE(mvm,
1757 "No data about high rate and low rate is worse. Increase rate\n");
1758 return RS_ACTION_UPSCALE;
1759 }
1760
1761 if ((high_tpt != IWL_INVALID_VALUE) &&
1762 (high_tpt > current_tpt)) {
1763 IWL_DEBUG_RATE(mvm,
1764 "Higher rate is better. Increate rate\n");
1765 return RS_ACTION_UPSCALE;
1766 }
1767
1768 if ((low_tpt != IWL_INVALID_VALUE) &&
1769 (high_tpt != IWL_INVALID_VALUE) &&
1770 (low_tpt < current_tpt) &&
1771 (high_tpt < current_tpt)) {
1772 IWL_DEBUG_RATE(mvm,
1773 "Both high and low are worse. Maintain rate\n");
1774 return RS_ACTION_STAY;
1775 }
1776
1777 if ((low_tpt != IWL_INVALID_VALUE) &&
1778 (low_tpt > current_tpt)) {
1779 IWL_DEBUG_RATE(mvm,
1780 "Lower rate is better\n");
1781 action = RS_ACTION_DOWNSCALE;
1782 goto out;
1783 }
1784
1785 if ((low_tpt == IWL_INVALID_VALUE) &&
1786 (low != IWL_RATE_INVALID)) {
1787 IWL_DEBUG_RATE(mvm,
1788 "No data about lower rate\n");
1789 action = RS_ACTION_DOWNSCALE;
1790 goto out;
1791 }
1792
1793 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1794
1795 out:
1796 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1797 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1798 IWL_DEBUG_RATE(mvm,
1799 "SR is above NO DECREASE. Avoid downscale\n");
1800 action = RS_ACTION_STAY;
1801 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1802 IWL_DEBUG_RATE(mvm,
1803 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1804 action = RS_ACTION_STAY;
1805 } else {
1806 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1807 }
1808 }
1809
1810 return action;
1811 }
1812
1813 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1814 struct iwl_lq_sta *lq_sta)
1815 {
1816 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1817 * supports STBC of at least 1*SS
1818 */
1819 if (!lq_sta->stbc_capable)
1820 return false;
1821
1822 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1823 return false;
1824
1825 return true;
1826 }
1827
1828 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1829 int *weaker, int *stronger)
1830 {
1831 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1832 if (*weaker > TPC_MAX_REDUCTION)
1833 *weaker = TPC_INVALID;
1834
1835 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1836 if (*stronger < 0)
1837 *stronger = TPC_INVALID;
1838 }
1839
1840 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1841 struct rs_rate *rate, enum ieee80211_band band)
1842 {
1843 int index = rate->index;
1844 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1845 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1846 !vif->bss_conf.ps);
1847
1848 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1849 cam, sta_ps_disabled);
1850 /*
1851 * allow tpc only if power management is enabled, or bt coex
1852 * activity grade allows it and we are on 2.4Ghz.
1853 */
1854 if ((cam || sta_ps_disabled) &&
1855 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1856 return false;
1857
1858 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1859 if (is_legacy(rate))
1860 return index == IWL_RATE_54M_INDEX;
1861 if (is_ht(rate))
1862 return index == IWL_RATE_MCS_7_INDEX;
1863 if (is_vht(rate))
1864 return index == IWL_RATE_MCS_7_INDEX ||
1865 index == IWL_RATE_MCS_8_INDEX ||
1866 index == IWL_RATE_MCS_9_INDEX;
1867
1868 WARN_ON_ONCE(1);
1869 return false;
1870 }
1871
1872 enum tpc_action {
1873 TPC_ACTION_STAY,
1874 TPC_ACTION_DECREASE,
1875 TPC_ACTION_INCREASE,
1876 TPC_ACTION_NO_RESTIRCTION,
1877 };
1878
1879 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1880 s32 sr, int weak, int strong,
1881 int current_tpt,
1882 int weak_tpt, int strong_tpt)
1883 {
1884 /* stay until we have valid tpt */
1885 if (current_tpt == IWL_INVALID_VALUE) {
1886 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1887 return TPC_ACTION_STAY;
1888 }
1889
1890 /* Too many failures, increase txp */
1891 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1892 current_tpt == 0) {
1893 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1894 return TPC_ACTION_NO_RESTIRCTION;
1895 }
1896
1897 /* try decreasing first if applicable */
1898 if (weak != TPC_INVALID) {
1899 if (weak_tpt == IWL_INVALID_VALUE &&
1900 (strong_tpt == IWL_INVALID_VALUE ||
1901 current_tpt >= strong_tpt)) {
1902 IWL_DEBUG_RATE(mvm,
1903 "no weak txp measurement. decrease txp\n");
1904 return TPC_ACTION_DECREASE;
1905 }
1906
1907 if (weak_tpt > current_tpt) {
1908 IWL_DEBUG_RATE(mvm,
1909 "lower txp has better tpt. decrease txp\n");
1910 return TPC_ACTION_DECREASE;
1911 }
1912 }
1913
1914 /* next, increase if needed */
1915 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1916 strong != TPC_INVALID) {
1917 if (weak_tpt == IWL_INVALID_VALUE &&
1918 strong_tpt != IWL_INVALID_VALUE &&
1919 current_tpt < strong_tpt) {
1920 IWL_DEBUG_RATE(mvm,
1921 "higher txp has better tpt. increase txp\n");
1922 return TPC_ACTION_INCREASE;
1923 }
1924
1925 if (weak_tpt < current_tpt &&
1926 (strong_tpt == IWL_INVALID_VALUE ||
1927 strong_tpt > current_tpt)) {
1928 IWL_DEBUG_RATE(mvm,
1929 "lower txp has worse tpt. increase txp\n");
1930 return TPC_ACTION_INCREASE;
1931 }
1932 }
1933
1934 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1935 return TPC_ACTION_STAY;
1936 }
1937
1938 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1939 struct ieee80211_sta *sta,
1940 struct iwl_lq_sta *lq_sta,
1941 struct iwl_scale_tbl_info *tbl)
1942 {
1943 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1944 struct ieee80211_vif *vif = mvm_sta->vif;
1945 struct ieee80211_chanctx_conf *chanctx_conf;
1946 enum ieee80211_band band;
1947 struct iwl_rate_scale_data *window;
1948 struct rs_rate *rate = &tbl->rate;
1949 enum tpc_action action;
1950 s32 sr;
1951 u8 cur = lq_sta->lq.reduced_tpc;
1952 int current_tpt;
1953 int weak, strong;
1954 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1955
1956 #ifdef CONFIG_MAC80211_DEBUGFS
1957 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1958 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1959 lq_sta->pers.dbg_fixed_txp_reduction);
1960 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1961 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1962 }
1963 #endif
1964
1965 rcu_read_lock();
1966 chanctx_conf = rcu_dereference(vif->chanctx_conf);
1967 if (WARN_ON(!chanctx_conf))
1968 band = IEEE80211_NUM_BANDS;
1969 else
1970 band = chanctx_conf->def.chan->band;
1971 rcu_read_unlock();
1972
1973 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1974 IWL_DEBUG_RATE(mvm,
1975 "tpc is not allowed. remove txp restrictions\n");
1976 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1977 return cur != TPC_NO_REDUCTION;
1978 }
1979
1980 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1981
1982 /* Collect measured throughputs for current and adjacent rates */
1983 window = tbl->tpc_win;
1984 sr = window[cur].success_ratio;
1985 current_tpt = window[cur].average_tpt;
1986 if (weak != TPC_INVALID)
1987 weak_tpt = window[weak].average_tpt;
1988 if (strong != TPC_INVALID)
1989 strong_tpt = window[strong].average_tpt;
1990
1991 IWL_DEBUG_RATE(mvm,
1992 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1993 cur, current_tpt, sr, weak, strong,
1994 weak_tpt, strong_tpt);
1995
1996 action = rs_get_tpc_action(mvm, sr, weak, strong,
1997 current_tpt, weak_tpt, strong_tpt);
1998
1999 /* override actions if we are on the edge */
2000 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2001 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2002 action = TPC_ACTION_STAY;
2003 } else if (strong == TPC_INVALID &&
2004 (action == TPC_ACTION_INCREASE ||
2005 action == TPC_ACTION_NO_RESTIRCTION)) {
2006 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2007 action = TPC_ACTION_STAY;
2008 }
2009
2010 switch (action) {
2011 case TPC_ACTION_DECREASE:
2012 lq_sta->lq.reduced_tpc = weak;
2013 return true;
2014 case TPC_ACTION_INCREASE:
2015 lq_sta->lq.reduced_tpc = strong;
2016 return true;
2017 case TPC_ACTION_NO_RESTIRCTION:
2018 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2019 return true;
2020 case TPC_ACTION_STAY:
2021 /* do nothing */
2022 break;
2023 }
2024 return false;
2025 }
2026
2027 /*
2028 * Do rate scaling and search for new modulation mode.
2029 */
2030 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2031 struct ieee80211_sta *sta,
2032 struct iwl_lq_sta *lq_sta,
2033 int tid)
2034 {
2035 int low = IWL_RATE_INVALID;
2036 int high = IWL_RATE_INVALID;
2037 int index;
2038 struct iwl_rate_scale_data *window = NULL;
2039 int current_tpt = IWL_INVALID_VALUE;
2040 int low_tpt = IWL_INVALID_VALUE;
2041 int high_tpt = IWL_INVALID_VALUE;
2042 u32 fail_count;
2043 enum rs_action scale_action = RS_ACTION_STAY;
2044 u16 rate_mask;
2045 u8 update_lq = 0;
2046 struct iwl_scale_tbl_info *tbl, *tbl1;
2047 u8 active_tbl = 0;
2048 u8 done_search = 0;
2049 u16 high_low;
2050 s32 sr;
2051 u8 prev_agg = lq_sta->is_agg;
2052 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2053 struct iwl_mvm_tid_data *tid_data;
2054 struct rs_rate *rate;
2055
2056 lq_sta->is_agg = !!sta_priv->agg_tids;
2057
2058 /*
2059 * Select rate-scale / modulation-mode table to work with in
2060 * the rest of this function: "search" if searching for better
2061 * modulation mode, or "active" if doing rate scaling within a mode.
2062 */
2063 if (!lq_sta->search_better_tbl)
2064 active_tbl = lq_sta->active_tbl;
2065 else
2066 active_tbl = 1 - lq_sta->active_tbl;
2067
2068 tbl = &(lq_sta->lq_info[active_tbl]);
2069 rate = &tbl->rate;
2070
2071 if (prev_agg != lq_sta->is_agg) {
2072 IWL_DEBUG_RATE(mvm,
2073 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2074 prev_agg, lq_sta->is_agg);
2075 rs_set_expected_tpt_table(lq_sta, tbl);
2076 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2077 }
2078
2079 /* current tx rate */
2080 index = lq_sta->last_txrate_idx;
2081
2082 /* rates available for this association, and for modulation mode */
2083 rate_mask = rs_get_supported_rates(lq_sta, rate);
2084
2085 if (!(BIT(index) & rate_mask)) {
2086 IWL_ERR(mvm, "Current Rate is not valid\n");
2087 if (lq_sta->search_better_tbl) {
2088 /* revert to active table if search table is not valid*/
2089 rate->type = LQ_NONE;
2090 lq_sta->search_better_tbl = 0;
2091 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2092 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2093 }
2094 return;
2095 }
2096
2097 /* Get expected throughput table and history window for current rate */
2098 if (!tbl->expected_tpt) {
2099 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2100 return;
2101 }
2102
2103 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2104 window = &(tbl->win[index]);
2105
2106 /*
2107 * If there is not enough history to calculate actual average
2108 * throughput, keep analyzing results of more tx frames, without
2109 * changing rate or mode (bypass most of the rest of this function).
2110 * Set up new rate table in uCode only if old rate is not supported
2111 * in current association (use new rate found above).
2112 */
2113 fail_count = window->counter - window->success_counter;
2114 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2115 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2116 IWL_DEBUG_RATE(mvm,
2117 "(%s: %d): Test Window: succ %d total %d\n",
2118 rs_pretty_lq_type(rate->type),
2119 index, window->success_counter, window->counter);
2120
2121 /* Can't calculate this yet; not enough history */
2122 window->average_tpt = IWL_INVALID_VALUE;
2123
2124 /* Should we stay with this modulation mode,
2125 * or search for a new one? */
2126 rs_stay_in_table(lq_sta, false);
2127
2128 goto out;
2129 }
2130 /* Else we have enough samples; calculate estimate of
2131 * actual average throughput */
2132 if (window->average_tpt != ((window->success_ratio *
2133 tbl->expected_tpt[index] + 64) / 128)) {
2134 window->average_tpt = ((window->success_ratio *
2135 tbl->expected_tpt[index] + 64) / 128);
2136 }
2137
2138 /* If we are searching for better modulation mode, check success. */
2139 if (lq_sta->search_better_tbl) {
2140 /* If good success, continue using the "search" mode;
2141 * no need to send new link quality command, since we're
2142 * continuing to use the setup that we've been trying. */
2143 if (window->average_tpt > lq_sta->last_tpt) {
2144 IWL_DEBUG_RATE(mvm,
2145 "SWITCHING TO NEW TABLE SR: %d "
2146 "cur-tpt %d old-tpt %d\n",
2147 window->success_ratio,
2148 window->average_tpt,
2149 lq_sta->last_tpt);
2150
2151 /* Swap tables; "search" becomes "active" */
2152 lq_sta->active_tbl = active_tbl;
2153 current_tpt = window->average_tpt;
2154 /* Else poor success; go back to mode in "active" table */
2155 } else {
2156 IWL_DEBUG_RATE(mvm,
2157 "GOING BACK TO THE OLD TABLE: SR %d "
2158 "cur-tpt %d old-tpt %d\n",
2159 window->success_ratio,
2160 window->average_tpt,
2161 lq_sta->last_tpt);
2162
2163 /* Nullify "search" table */
2164 rate->type = LQ_NONE;
2165
2166 /* Revert to "active" table */
2167 active_tbl = lq_sta->active_tbl;
2168 tbl = &(lq_sta->lq_info[active_tbl]);
2169
2170 /* Revert to "active" rate and throughput info */
2171 index = tbl->rate.index;
2172 current_tpt = lq_sta->last_tpt;
2173
2174 /* Need to set up a new rate table in uCode */
2175 update_lq = 1;
2176 }
2177
2178 /* Either way, we've made a decision; modulation mode
2179 * search is done, allow rate adjustment next time. */
2180 lq_sta->search_better_tbl = 0;
2181 done_search = 1; /* Don't switch modes below! */
2182 goto lq_update;
2183 }
2184
2185 /* (Else) not in search of better modulation mode, try for better
2186 * starting rate, while staying in this mode. */
2187 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2188 low = high_low & 0xff;
2189 high = (high_low >> 8) & 0xff;
2190
2191 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2192
2193 sr = window->success_ratio;
2194
2195 /* Collect measured throughputs for current and adjacent rates */
2196 current_tpt = window->average_tpt;
2197 if (low != IWL_RATE_INVALID)
2198 low_tpt = tbl->win[low].average_tpt;
2199 if (high != IWL_RATE_INVALID)
2200 high_tpt = tbl->win[high].average_tpt;
2201
2202 IWL_DEBUG_RATE(mvm,
2203 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2204 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2205 low, high, low_tpt, high_tpt);
2206
2207 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2208 current_tpt, low_tpt, high_tpt);
2209
2210 /* Force a search in case BT doesn't like us being in MIMO */
2211 if (is_mimo(rate) &&
2212 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2213 IWL_DEBUG_RATE(mvm,
2214 "BT Coex forbids MIMO. Search for new config\n");
2215 rs_stay_in_table(lq_sta, true);
2216 goto lq_update;
2217 }
2218
2219 switch (scale_action) {
2220 case RS_ACTION_DOWNSCALE:
2221 /* Decrease starting rate, update uCode's rate table */
2222 if (low != IWL_RATE_INVALID) {
2223 update_lq = 1;
2224 index = low;
2225 } else {
2226 IWL_DEBUG_RATE(mvm,
2227 "At the bottom rate. Can't decrease\n");
2228 }
2229
2230 break;
2231 case RS_ACTION_UPSCALE:
2232 /* Increase starting rate, update uCode's rate table */
2233 if (high != IWL_RATE_INVALID) {
2234 update_lq = 1;
2235 index = high;
2236 } else {
2237 IWL_DEBUG_RATE(mvm,
2238 "At the top rate. Can't increase\n");
2239 }
2240
2241 break;
2242 case RS_ACTION_STAY:
2243 /* No change */
2244 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2245 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2246 break;
2247 default:
2248 break;
2249 }
2250
2251 lq_update:
2252 /* Replace uCode's rate table for the destination station. */
2253 if (update_lq) {
2254 tbl->rate.index = index;
2255 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2256 }
2257
2258 rs_stay_in_table(lq_sta, false);
2259
2260 /*
2261 * Search for new modulation mode if we're:
2262 * 1) Not changing rates right now
2263 * 2) Not just finishing up a search
2264 * 3) Allowing a new search
2265 */
2266 if (!update_lq && !done_search &&
2267 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2268 && window->counter) {
2269 enum rs_column next_column;
2270
2271 /* Save current throughput to compare with "search" throughput*/
2272 lq_sta->last_tpt = current_tpt;
2273
2274 IWL_DEBUG_RATE(mvm,
2275 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2276 update_lq, done_search, lq_sta->rs_state,
2277 window->counter);
2278
2279 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2280 if (next_column != RS_COLUMN_INVALID) {
2281 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2282 next_column);
2283 if (!ret)
2284 lq_sta->search_better_tbl = 1;
2285 } else {
2286 IWL_DEBUG_RATE(mvm,
2287 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2288 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2289 }
2290
2291 /* If new "search" mode was selected, set up in uCode table */
2292 if (lq_sta->search_better_tbl) {
2293 /* Access the "search" table, clear its history. */
2294 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2295 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2296
2297 /* Use new "search" start rate */
2298 index = tbl->rate.index;
2299
2300 rs_dump_rate(mvm, &tbl->rate,
2301 "Switch to SEARCH TABLE:");
2302 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2303 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2304 } else {
2305 done_search = 1;
2306 }
2307 }
2308
2309 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2310 /* If the "active" (non-search) mode was legacy,
2311 * and we've tried switching antennas,
2312 * but we haven't been able to try HT modes (not available),
2313 * stay with best antenna legacy modulation for a while
2314 * before next round of mode comparisons. */
2315 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2316 if (is_legacy(&tbl1->rate)) {
2317 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2318
2319 if (tid != IWL_MAX_TID_COUNT) {
2320 tid_data = &sta_priv->tid_data[tid];
2321 if (tid_data->state != IWL_AGG_OFF) {
2322 IWL_DEBUG_RATE(mvm,
2323 "Stop aggregation on tid %d\n",
2324 tid);
2325 ieee80211_stop_tx_ba_session(sta, tid);
2326 }
2327 }
2328 rs_set_stay_in_table(mvm, 1, lq_sta);
2329 } else {
2330 /* If we're in an HT mode, and all 3 mode switch actions
2331 * have been tried and compared, stay in this best modulation
2332 * mode for a while before next round of mode comparisons. */
2333 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2334 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2335 (tid != IWL_MAX_TID_COUNT)) {
2336 tid_data = &sta_priv->tid_data[tid];
2337 if (tid_data->state == IWL_AGG_OFF) {
2338 IWL_DEBUG_RATE(mvm,
2339 "try to aggregate tid %d\n",
2340 tid);
2341 rs_tl_turn_on_agg(mvm, tid,
2342 lq_sta, sta);
2343 }
2344 }
2345 rs_set_stay_in_table(mvm, 0, lq_sta);
2346 }
2347 }
2348
2349 out:
2350 lq_sta->last_txrate_idx = index;
2351 }
2352
2353 struct rs_init_rate_info {
2354 s8 rssi;
2355 u8 rate_idx;
2356 };
2357
2358 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2359 { -60, IWL_RATE_54M_INDEX },
2360 { -64, IWL_RATE_48M_INDEX },
2361 { -68, IWL_RATE_36M_INDEX },
2362 { -80, IWL_RATE_24M_INDEX },
2363 { -84, IWL_RATE_18M_INDEX },
2364 { -85, IWL_RATE_12M_INDEX },
2365 { -86, IWL_RATE_11M_INDEX },
2366 { -88, IWL_RATE_5M_INDEX },
2367 { -90, IWL_RATE_2M_INDEX },
2368 { S8_MIN, IWL_RATE_1M_INDEX },
2369 };
2370
2371 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2372 { -60, IWL_RATE_54M_INDEX },
2373 { -64, IWL_RATE_48M_INDEX },
2374 { -72, IWL_RATE_36M_INDEX },
2375 { -80, IWL_RATE_24M_INDEX },
2376 { -84, IWL_RATE_18M_INDEX },
2377 { -85, IWL_RATE_12M_INDEX },
2378 { -87, IWL_RATE_9M_INDEX },
2379 { S8_MIN, IWL_RATE_6M_INDEX },
2380 };
2381
2382 /* Choose an initial legacy rate and antenna to use based on the RSSI
2383 * of last Rx
2384 */
2385 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2386 struct iwl_lq_sta *lq_sta,
2387 enum ieee80211_band band,
2388 struct rs_rate *rate)
2389 {
2390 int i, nentries;
2391 s8 best_rssi = S8_MIN;
2392 u8 best_ant = ANT_NONE;
2393 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2394 const struct rs_init_rate_info *initial_rates;
2395
2396 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2397 if (!(lq_sta->pers.chains & BIT(i)))
2398 continue;
2399
2400 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2401 best_rssi = lq_sta->pers.chain_signal[i];
2402 best_ant = BIT(i);
2403 }
2404 }
2405
2406 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2407 rs_pretty_ant(best_ant), best_rssi);
2408
2409 if (best_ant != ANT_A && best_ant != ANT_B)
2410 rate->ant = first_antenna(valid_tx_ant);
2411 else
2412 rate->ant = best_ant;
2413
2414 rate->sgi = false;
2415 rate->ldpc = false;
2416 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2417
2418 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2419 BITS_PER_LONG);
2420
2421 if (band == IEEE80211_BAND_5GHZ) {
2422 rate->type = LQ_LEGACY_A;
2423 initial_rates = rs_init_rates_5ghz;
2424 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2425 } else {
2426 rate->type = LQ_LEGACY_G;
2427 initial_rates = rs_init_rates_24ghz;
2428 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2429 }
2430
2431 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2432 for (i = 0; i < nentries; i++) {
2433 int rate_idx = initial_rates[i].rate_idx;
2434 if ((best_rssi >= initial_rates[i].rssi) &&
2435 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2436 rate->index = rate_idx;
2437 break;
2438 }
2439 }
2440 }
2441
2442 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2443 rs_pretty_ant(rate->ant));
2444 }
2445
2446 /* Save info about RSSI of last Rx */
2447 void rs_update_last_rssi(struct iwl_mvm *mvm,
2448 struct iwl_lq_sta *lq_sta,
2449 struct ieee80211_rx_status *rx_status)
2450 {
2451 lq_sta->pers.chains = rx_status->chains;
2452 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2453 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2454 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2455 }
2456
2457 /**
2458 * rs_initialize_lq - Initialize a station's hardware rate table
2459 *
2460 * The uCode's station table contains a table of fallback rates
2461 * for automatic fallback during transmission.
2462 *
2463 * NOTE: This sets up a default set of values. These will be replaced later
2464 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2465 * rc80211_simple.
2466 *
2467 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2468 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2469 * which requires station table entry to exist).
2470 */
2471 static void rs_initialize_lq(struct iwl_mvm *mvm,
2472 struct ieee80211_sta *sta,
2473 struct iwl_lq_sta *lq_sta,
2474 enum ieee80211_band band,
2475 bool init)
2476 {
2477 struct iwl_scale_tbl_info *tbl;
2478 struct rs_rate *rate;
2479 u8 active_tbl = 0;
2480
2481 if (!sta || !lq_sta)
2482 return;
2483
2484 if (!lq_sta->search_better_tbl)
2485 active_tbl = lq_sta->active_tbl;
2486 else
2487 active_tbl = 1 - lq_sta->active_tbl;
2488
2489 tbl = &(lq_sta->lq_info[active_tbl]);
2490 rate = &tbl->rate;
2491
2492 rs_get_initial_rate(mvm, lq_sta, band, rate);
2493 lq_sta->last_txrate_idx = rate->index;
2494
2495 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2496 if (rate->ant == ANT_A)
2497 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2498 else
2499 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2500
2501 rs_set_expected_tpt_table(lq_sta, tbl);
2502 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2503 /* TODO restore station should remember the lq cmd */
2504 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2505 }
2506
2507 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2508 struct ieee80211_tx_rate_control *txrc)
2509 {
2510 struct sk_buff *skb = txrc->skb;
2511 struct iwl_op_mode *op_mode __maybe_unused =
2512 (struct iwl_op_mode *)mvm_r;
2513 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2514 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2515 struct iwl_lq_sta *lq_sta = mvm_sta;
2516
2517 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2518 /* if vif isn't initialized mvm doesn't know about
2519 * this station, so don't do anything with the it
2520 */
2521 sta = NULL;
2522 mvm_sta = NULL;
2523 }
2524
2525 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2526
2527 /* Treat uninitialized rate scaling data same as non-existing. */
2528 if (lq_sta && !lq_sta->pers.drv) {
2529 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2530 mvm_sta = NULL;
2531 }
2532
2533 /* Send management frames and NO_ACK data using lowest rate. */
2534 if (rate_control_send_low(sta, mvm_sta, txrc))
2535 return;
2536
2537 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2538 info->band, &info->control.rates[0]);
2539
2540 info->control.rates[0].count = 1;
2541 }
2542
2543 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2544 gfp_t gfp)
2545 {
2546 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2547 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2548 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2549 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2550
2551 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2552
2553 lq_sta->pers.drv = mvm;
2554 #ifdef CONFIG_MAC80211_DEBUGFS
2555 lq_sta->pers.dbg_fixed_rate = 0;
2556 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2557 #endif
2558 lq_sta->pers.chains = 0;
2559 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2560
2561 return &sta_priv->lq_sta;
2562 }
2563
2564 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2565 int nss)
2566 {
2567 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2568 (0x3 << (2 * (nss - 1)));
2569 rx_mcs >>= (2 * (nss - 1));
2570
2571 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2572 return IWL_RATE_MCS_7_INDEX;
2573 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2574 return IWL_RATE_MCS_8_INDEX;
2575 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2576 return IWL_RATE_MCS_9_INDEX;
2577
2578 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2579 return -1;
2580 }
2581
2582 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2583 struct ieee80211_sta_vht_cap *vht_cap,
2584 struct iwl_lq_sta *lq_sta)
2585 {
2586 int i;
2587 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2588
2589 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2590 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2591 if (i == IWL_RATE_9M_INDEX)
2592 continue;
2593
2594 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2595 if (i == IWL_RATE_MCS_9_INDEX &&
2596 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2597 continue;
2598
2599 lq_sta->active_siso_rate |= BIT(i);
2600 }
2601 }
2602
2603 if (sta->rx_nss < 2)
2604 return;
2605
2606 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2607 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2608 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2609 if (i == IWL_RATE_9M_INDEX)
2610 continue;
2611
2612 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2613 if (i == IWL_RATE_MCS_9_INDEX &&
2614 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2615 continue;
2616
2617 lq_sta->active_mimo2_rate |= BIT(i);
2618 }
2619 }
2620 }
2621
2622 static void rs_ht_init(struct iwl_mvm *mvm,
2623 struct ieee80211_sta *sta,
2624 struct iwl_lq_sta *lq_sta,
2625 struct ieee80211_sta_ht_cap *ht_cap)
2626 {
2627 /* active_siso_rate mask includes 9 MBits (bit 5),
2628 * and CCK (bits 0-3), supp_rates[] does not;
2629 * shift to convert format, force 9 MBits off.
2630 */
2631 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2632 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2633 lq_sta->active_siso_rate &= ~((u16)0x2);
2634 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2635
2636 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2637 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2638 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2639 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2640
2641 if (mvm->cfg->ht_params->ldpc &&
2642 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2643 lq_sta->ldpc = true;
2644
2645 if (mvm->cfg->ht_params->stbc &&
2646 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2647 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2648 lq_sta->stbc_capable = true;
2649
2650 lq_sta->is_vht = false;
2651 }
2652
2653 static void rs_vht_init(struct iwl_mvm *mvm,
2654 struct ieee80211_sta *sta,
2655 struct iwl_lq_sta *lq_sta,
2656 struct ieee80211_sta_vht_cap *vht_cap)
2657 {
2658 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2659
2660 if (mvm->cfg->ht_params->ldpc &&
2661 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2662 lq_sta->ldpc = true;
2663
2664 if (mvm->cfg->ht_params->stbc &&
2665 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2666 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2667 lq_sta->stbc_capable = true;
2668
2669 if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2670 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2671 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2672 lq_sta->bfer_capable = true;
2673
2674 lq_sta->is_vht = true;
2675 }
2676
2677 #ifdef CONFIG_IWLWIFI_DEBUGFS
2678 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2679 {
2680 spin_lock_bh(&mvm->drv_stats_lock);
2681 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2682 spin_unlock_bh(&mvm->drv_stats_lock);
2683 }
2684
2685 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2686 {
2687 u8 nss = 0, mcs = 0;
2688
2689 spin_lock(&mvm->drv_stats_lock);
2690
2691 if (agg)
2692 mvm->drv_rx_stats.agg_frames++;
2693
2694 mvm->drv_rx_stats.success_frames++;
2695
2696 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2697 case RATE_MCS_CHAN_WIDTH_20:
2698 mvm->drv_rx_stats.bw_20_frames++;
2699 break;
2700 case RATE_MCS_CHAN_WIDTH_40:
2701 mvm->drv_rx_stats.bw_40_frames++;
2702 break;
2703 case RATE_MCS_CHAN_WIDTH_80:
2704 mvm->drv_rx_stats.bw_80_frames++;
2705 break;
2706 default:
2707 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2708 }
2709
2710 if (rate & RATE_MCS_HT_MSK) {
2711 mvm->drv_rx_stats.ht_frames++;
2712 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2713 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2714 } else if (rate & RATE_MCS_VHT_MSK) {
2715 mvm->drv_rx_stats.vht_frames++;
2716 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2717 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2718 RATE_VHT_MCS_NSS_POS) + 1;
2719 } else {
2720 mvm->drv_rx_stats.legacy_frames++;
2721 }
2722
2723 if (nss == 1)
2724 mvm->drv_rx_stats.siso_frames++;
2725 else if (nss == 2)
2726 mvm->drv_rx_stats.mimo2_frames++;
2727
2728 if (rate & RATE_MCS_SGI_MSK)
2729 mvm->drv_rx_stats.sgi_frames++;
2730 else
2731 mvm->drv_rx_stats.ngi_frames++;
2732
2733 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2734 mvm->drv_rx_stats.last_frame_idx =
2735 (mvm->drv_rx_stats.last_frame_idx + 1) %
2736 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2737
2738 spin_unlock(&mvm->drv_stats_lock);
2739 }
2740 #endif
2741
2742 /*
2743 * Called after adding a new station to initialize rate scaling
2744 */
2745 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2746 enum ieee80211_band band, bool init)
2747 {
2748 int i, j;
2749 struct ieee80211_hw *hw = mvm->hw;
2750 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2751 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2752 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2753 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2754 struct ieee80211_supported_band *sband;
2755 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2756
2757 /* clear all non-persistent lq data */
2758 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2759
2760 sband = hw->wiphy->bands[band];
2761
2762 lq_sta->lq.sta_id = sta_priv->sta_id;
2763
2764 for (j = 0; j < LQ_SIZE; j++)
2765 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2766
2767 lq_sta->flush_timer = 0;
2768 lq_sta->last_tx = jiffies;
2769
2770 IWL_DEBUG_RATE(mvm,
2771 "LQ: *** rate scale station global init for station %d ***\n",
2772 sta_priv->sta_id);
2773 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2774 * the lowest or the highest rate.. Could consider using RSSI from
2775 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2776 * after assoc.. */
2777
2778 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2779 lq_sta->band = sband->band;
2780 /*
2781 * active legacy rates as per supported rates bitmap
2782 */
2783 supp = sta->supp_rates[sband->band];
2784 lq_sta->active_legacy_rate = 0;
2785 for_each_set_bit(i, &supp, BITS_PER_LONG)
2786 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2787
2788 /* TODO: should probably account for rx_highest for both HT/VHT */
2789 if (!vht_cap || !vht_cap->vht_supported)
2790 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2791 else
2792 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2793
2794 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2795 lq_sta->active_mimo2_rate = 0;
2796
2797 lq_sta->max_legacy_rate_idx =
2798 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2799 lq_sta->max_siso_rate_idx =
2800 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2801 lq_sta->max_mimo2_rate_idx =
2802 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2803
2804 IWL_DEBUG_RATE(mvm,
2805 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2806 lq_sta->active_legacy_rate,
2807 lq_sta->active_siso_rate,
2808 lq_sta->active_mimo2_rate,
2809 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2810 lq_sta->bfer_capable);
2811 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2812 lq_sta->max_legacy_rate_idx,
2813 lq_sta->max_siso_rate_idx,
2814 lq_sta->max_mimo2_rate_idx);
2815
2816 /* These values will be overridden later */
2817 lq_sta->lq.single_stream_ant_msk =
2818 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2819 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2820
2821 /* as default allow aggregation for all tids */
2822 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2823 lq_sta->is_agg = 0;
2824 #ifdef CONFIG_IWLWIFI_DEBUGFS
2825 iwl_mvm_reset_frame_stats(mvm);
2826 #endif
2827 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2828 }
2829
2830 static void rs_rate_update(void *mvm_r,
2831 struct ieee80211_supported_band *sband,
2832 struct cfg80211_chan_def *chandef,
2833 struct ieee80211_sta *sta, void *priv_sta,
2834 u32 changed)
2835 {
2836 u8 tid;
2837 struct iwl_op_mode *op_mode =
2838 (struct iwl_op_mode *)mvm_r;
2839 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2840
2841 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
2842 return;
2843
2844 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2845 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2846 ieee80211_stop_tx_ba_session(sta, tid);
2847
2848 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2849 }
2850
2851 #ifdef CONFIG_MAC80211_DEBUGFS
2852 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2853 struct iwl_lq_cmd *lq_cmd,
2854 enum ieee80211_band band,
2855 u32 ucode_rate)
2856 {
2857 struct rs_rate rate;
2858 int i;
2859 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2860 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2861 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2862
2863 for (i = 0; i < num_rates; i++)
2864 lq_cmd->rs_table[i] = ucode_rate_le32;
2865
2866 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2867
2868 if (is_mimo(&rate))
2869 lq_cmd->mimo_delim = num_rates - 1;
2870 else
2871 lq_cmd->mimo_delim = 0;
2872
2873 lq_cmd->reduced_tpc = 0;
2874
2875 if (num_of_ant(ant) == 1)
2876 lq_cmd->single_stream_ant_msk = ant;
2877
2878 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2879 }
2880 #endif /* CONFIG_MAC80211_DEBUGFS */
2881
2882 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2883 struct iwl_lq_sta *lq_sta,
2884 struct rs_rate *rate,
2885 __le32 *rs_table, int *rs_table_index,
2886 int num_rates, int num_retries,
2887 u8 valid_tx_ant, bool toggle_ant)
2888 {
2889 int i, j;
2890 __le32 ucode_rate;
2891 bool bottom_reached = false;
2892 int prev_rate_idx = rate->index;
2893 int end = LINK_QUAL_MAX_RETRY_NUM;
2894 int index = *rs_table_index;
2895
2896 for (i = 0; i < num_rates && index < end; i++) {
2897 for (j = 0; j < num_retries && index < end; j++, index++) {
2898 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2899 rate));
2900 rs_table[index] = ucode_rate;
2901 if (toggle_ant)
2902 rs_toggle_antenna(valid_tx_ant, rate);
2903 }
2904
2905 prev_rate_idx = rate->index;
2906 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2907 if (bottom_reached && !is_legacy(rate))
2908 break;
2909 }
2910
2911 if (!bottom_reached && !is_legacy(rate))
2912 rate->index = prev_rate_idx;
2913
2914 *rs_table_index = index;
2915 }
2916
2917 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2918 * column the rate table should look like this:
2919 *
2920 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2921 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2922 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2923 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2924 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2925 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2926 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2927 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2928 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2929 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2930 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2931 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2932 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2933 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2934 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2935 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2936 */
2937 static void rs_build_rates_table(struct iwl_mvm *mvm,
2938 struct ieee80211_sta *sta,
2939 struct iwl_lq_sta *lq_sta,
2940 const struct rs_rate *initial_rate)
2941 {
2942 struct rs_rate rate;
2943 int num_rates, num_retries, index = 0;
2944 u8 valid_tx_ant = 0;
2945 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2946 bool toggle_ant = false;
2947
2948 memcpy(&rate, initial_rate, sizeof(rate));
2949
2950 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2951
2952 /* TODO: remove old API when min FW API hits 14 */
2953 if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
2954 rs_stbc_allow(mvm, sta, lq_sta))
2955 rate.stbc = true;
2956
2957 if (is_siso(&rate)) {
2958 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2959 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2960 } else if (is_mimo(&rate)) {
2961 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2962 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2963 } else {
2964 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
2965 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
2966 toggle_ant = true;
2967 }
2968
2969 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2970 num_rates, num_retries, valid_tx_ant,
2971 toggle_ant);
2972
2973 rs_get_lower_rate_down_column(lq_sta, &rate);
2974
2975 if (is_siso(&rate)) {
2976 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2977 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
2978 lq_cmd->mimo_delim = index;
2979 } else if (is_legacy(&rate)) {
2980 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2981 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2982 } else {
2983 WARN_ON_ONCE(1);
2984 }
2985
2986 toggle_ant = true;
2987
2988 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2989 num_rates, num_retries, valid_tx_ant,
2990 toggle_ant);
2991
2992 rs_get_lower_rate_down_column(lq_sta, &rate);
2993
2994 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2995 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2996
2997 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2998 num_rates, num_retries, valid_tx_ant,
2999 toggle_ant);
3000
3001 }
3002
3003 struct rs_bfer_active_iter_data {
3004 struct ieee80211_sta *exclude_sta;
3005 struct iwl_mvm_sta *bfer_mvmsta;
3006 };
3007
3008 static void rs_bfer_active_iter(void *_data,
3009 struct ieee80211_sta *sta)
3010 {
3011 struct rs_bfer_active_iter_data *data = _data;
3012 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3013 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3014 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3015
3016 if (sta == data->exclude_sta)
3017 return;
3018
3019 /* The current sta has BFER allowed */
3020 if (ss_params & LQ_SS_BFER_ALLOWED) {
3021 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3022
3023 data->bfer_mvmsta = mvmsta;
3024 }
3025 }
3026
3027 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3028 {
3029 int prio = -1;
3030 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3031
3032 switch (viftype) {
3033 case NL80211_IFTYPE_AP:
3034 case NL80211_IFTYPE_P2P_GO:
3035 prio = 3;
3036 break;
3037 case NL80211_IFTYPE_P2P_CLIENT:
3038 prio = 2;
3039 break;
3040 case NL80211_IFTYPE_STATION:
3041 prio = 1;
3042 break;
3043 default:
3044 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3045 prio = -1;
3046 }
3047
3048 return prio;
3049 }
3050
3051 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3052 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3053 struct iwl_mvm_sta *sta2)
3054 {
3055 int prio1 = rs_bfer_priority(sta1);
3056 int prio2 = rs_bfer_priority(sta2);
3057
3058 if (prio1 > prio2)
3059 return 1;
3060 if (prio1 < prio2)
3061 return -1;
3062 return 0;
3063 }
3064
3065 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3066 struct ieee80211_sta *sta,
3067 struct iwl_lq_sta *lq_sta,
3068 const struct rs_rate *initial_rate)
3069 {
3070 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3071 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3072 struct rs_bfer_active_iter_data data = {
3073 .exclude_sta = sta,
3074 .bfer_mvmsta = NULL,
3075 };
3076 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3077 u32 ss_params = LQ_SS_PARAMS_VALID;
3078
3079 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3080 goto out;
3081
3082 /* Check if forcing the decision is configured.
3083 * Note that SISO is forced by not allowing STBC or BFER
3084 */
3085 if (lq_sta->ss_force == RS_SS_FORCE_STBC)
3086 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3087 else if (lq_sta->ss_force == RS_SS_FORCE_BFER)
3088 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3089
3090 if (lq_sta->ss_force != RS_SS_FORCE_NONE) {
3091 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3092 lq_sta->ss_force);
3093 goto out;
3094 }
3095
3096 if (lq_sta->stbc_capable)
3097 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3098
3099 if (!lq_sta->bfer_capable)
3100 goto out;
3101
3102 ieee80211_iterate_stations_atomic(mvm->hw,
3103 rs_bfer_active_iter,
3104 &data);
3105 bfer_mvmsta = data.bfer_mvmsta;
3106
3107 /* This code is safe as it doesn't run concurrently for different
3108 * stations. This is guaranteed by the fact that calls to
3109 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3110 */
3111 if (!bfer_mvmsta) {
3112 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3113
3114 ss_params |= LQ_SS_BFER_ALLOWED;
3115 goto out;
3116 }
3117
3118 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3119 bfer_mvmsta->sta_id);
3120
3121 /* Disallow BFER on another STA if active and we're a higher priority */
3122 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3123 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3124 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3125
3126 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3127 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3128 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3129
3130 ss_params |= LQ_SS_BFER_ALLOWED;
3131 IWL_DEBUG_RATE(mvm,
3132 "Lower priority BFER sta found (%d). Switch BFER\n",
3133 bfer_mvmsta->sta_id);
3134 }
3135 out:
3136 lq_cmd->ss_params = cpu_to_le32(ss_params);
3137 }
3138
3139 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3140 struct ieee80211_sta *sta,
3141 struct iwl_lq_sta *lq_sta,
3142 const struct rs_rate *initial_rate)
3143 {
3144 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3145 struct iwl_mvm_sta *mvmsta;
3146 struct iwl_mvm_vif *mvmvif;
3147
3148 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3149 lq_cmd->agg_time_limit =
3150 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3151
3152 #ifdef CONFIG_MAC80211_DEBUGFS
3153 if (lq_sta->pers.dbg_fixed_rate) {
3154 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3155 lq_sta->band,
3156 lq_sta->pers.dbg_fixed_rate);
3157 return;
3158 }
3159 #endif
3160 if (WARN_ON_ONCE(!sta || !initial_rate))
3161 return;
3162
3163 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3164
3165 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3166 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3167
3168 if (num_of_ant(initial_rate->ant) == 1)
3169 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3170
3171 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3172 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3173
3174 if (num_of_ant(initial_rate->ant) == 1)
3175 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3176
3177 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3178
3179 /*
3180 * In case of low latency, tell the firwmare to leave a frame in the
3181 * Tx Fifo so that it can start a transaction in the same TxOP. This
3182 * basically allows the firmware to send bursts.
3183 */
3184 if (iwl_mvm_vif_low_latency(mvmvif)) {
3185 lq_cmd->agg_frame_cnt_limit--;
3186
3187 if (mvm->low_latency_agg_frame_limit)
3188 lq_cmd->agg_frame_cnt_limit =
3189 min(lq_cmd->agg_frame_cnt_limit,
3190 mvm->low_latency_agg_frame_limit);
3191 }
3192
3193 if (mvmsta->vif->p2p)
3194 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3195
3196 lq_cmd->agg_time_limit =
3197 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3198 }
3199
3200 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3201 {
3202 return hw->priv;
3203 }
3204 /* rate scale requires free function to be implemented */
3205 static void rs_free(void *mvm_rate)
3206 {
3207 return;
3208 }
3209
3210 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3211 void *mvm_sta)
3212 {
3213 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3214 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3215
3216 IWL_DEBUG_RATE(mvm, "enter\n");
3217 IWL_DEBUG_RATE(mvm, "leave\n");
3218 }
3219
3220 #ifdef CONFIG_MAC80211_DEBUGFS
3221 int rs_pretty_print_rate(char *buf, const u32 rate)
3222 {
3223
3224 char *type, *bw;
3225 u8 mcs = 0, nss = 0;
3226 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3227
3228 if (!(rate & RATE_MCS_HT_MSK) &&
3229 !(rate & RATE_MCS_VHT_MSK)) {
3230 int index = iwl_hwrate_to_plcp_idx(rate);
3231
3232 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3233 rs_pretty_ant(ant),
3234 index == IWL_RATE_INVALID ? "BAD" :
3235 iwl_rate_mcs[index].mbps);
3236 }
3237
3238 if (rate & RATE_MCS_VHT_MSK) {
3239 type = "VHT";
3240 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3241 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3242 >> RATE_VHT_MCS_NSS_POS) + 1;
3243 } else if (rate & RATE_MCS_HT_MSK) {
3244 type = "HT";
3245 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3246 } else {
3247 type = "Unknown"; /* shouldn't happen */
3248 }
3249
3250 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3251 case RATE_MCS_CHAN_WIDTH_20:
3252 bw = "20Mhz";
3253 break;
3254 case RATE_MCS_CHAN_WIDTH_40:
3255 bw = "40Mhz";
3256 break;
3257 case RATE_MCS_CHAN_WIDTH_80:
3258 bw = "80Mhz";
3259 break;
3260 case RATE_MCS_CHAN_WIDTH_160:
3261 bw = "160Mhz";
3262 break;
3263 default:
3264 bw = "BAD BW";
3265 }
3266
3267 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3268 type, rs_pretty_ant(ant), bw, mcs, nss,
3269 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3270 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3271 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3272 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3273 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3274 }
3275
3276 /**
3277 * Program the device to use fixed rate for frame transmit
3278 * This is for debugging/testing only
3279 * once the device start use fixed rate, we need to reload the module
3280 * to being back the normal operation.
3281 */
3282 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3283 struct iwl_lq_sta *lq_sta)
3284 {
3285 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3286 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3287 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3288
3289 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3290 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3291
3292 if (lq_sta->pers.dbg_fixed_rate) {
3293 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3294 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3295 }
3296 }
3297
3298 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3299 const char __user *user_buf, size_t count, loff_t *ppos)
3300 {
3301 struct iwl_lq_sta *lq_sta = file->private_data;
3302 struct iwl_mvm *mvm;
3303 char buf[64];
3304 size_t buf_size;
3305 u32 parsed_rate;
3306
3307 mvm = lq_sta->pers.drv;
3308 memset(buf, 0, sizeof(buf));
3309 buf_size = min(count, sizeof(buf) - 1);
3310 if (copy_from_user(buf, user_buf, buf_size))
3311 return -EFAULT;
3312
3313 if (sscanf(buf, "%x", &parsed_rate) == 1)
3314 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3315 else
3316 lq_sta->pers.dbg_fixed_rate = 0;
3317
3318 rs_program_fix_rate(mvm, lq_sta);
3319
3320 return count;
3321 }
3322
3323 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3324 char __user *user_buf, size_t count, loff_t *ppos)
3325 {
3326 char *buff;
3327 int desc = 0;
3328 int i = 0;
3329 ssize_t ret;
3330
3331 struct iwl_lq_sta *lq_sta = file->private_data;
3332 struct iwl_mvm *mvm;
3333 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3334 struct rs_rate *rate = &tbl->rate;
3335 mvm = lq_sta->pers.drv;
3336 buff = kmalloc(2048, GFP_KERNEL);
3337 if (!buff)
3338 return -ENOMEM;
3339
3340 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3341 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3342 lq_sta->total_failed, lq_sta->total_success,
3343 lq_sta->active_legacy_rate);
3344 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3345 lq_sta->pers.dbg_fixed_rate);
3346 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3347 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3348 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3349 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3350 desc += sprintf(buff+desc, "lq type %s\n",
3351 (is_legacy(rate)) ? "legacy" :
3352 is_vht(rate) ? "VHT" : "HT");
3353 if (!is_legacy(rate)) {
3354 desc += sprintf(buff+desc, " %s",
3355 (is_siso(rate)) ? "SISO" : "MIMO2");
3356 desc += sprintf(buff+desc, " %s",
3357 (is_ht20(rate)) ? "20MHz" :
3358 (is_ht40(rate)) ? "40MHz" :
3359 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3360 desc += sprintf(buff+desc, " %s %s %s\n",
3361 (rate->sgi) ? "SGI" : "NGI",
3362 (rate->ldpc) ? "LDPC" : "BCC",
3363 (lq_sta->is_agg) ? "AGG on" : "");
3364 }
3365 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3366 lq_sta->last_rate_n_flags);
3367 desc += sprintf(buff+desc,
3368 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3369 lq_sta->lq.flags,
3370 lq_sta->lq.mimo_delim,
3371 lq_sta->lq.single_stream_ant_msk,
3372 lq_sta->lq.dual_stream_ant_msk);
3373
3374 desc += sprintf(buff+desc,
3375 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3376 le16_to_cpu(lq_sta->lq.agg_time_limit),
3377 lq_sta->lq.agg_disable_start_th,
3378 lq_sta->lq.agg_frame_cnt_limit);
3379
3380 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3381 desc += sprintf(buff+desc,
3382 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3383 lq_sta->lq.initial_rate_index[0],
3384 lq_sta->lq.initial_rate_index[1],
3385 lq_sta->lq.initial_rate_index[2],
3386 lq_sta->lq.initial_rate_index[3]);
3387
3388 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3389 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3390
3391 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3392 desc += rs_pretty_print_rate(buff+desc, r);
3393 }
3394
3395 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3396 kfree(buff);
3397 return ret;
3398 }
3399
3400 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3401 .write = rs_sta_dbgfs_scale_table_write,
3402 .read = rs_sta_dbgfs_scale_table_read,
3403 .open = simple_open,
3404 .llseek = default_llseek,
3405 };
3406 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3407 char __user *user_buf, size_t count, loff_t *ppos)
3408 {
3409 char *buff;
3410 int desc = 0;
3411 int i, j;
3412 ssize_t ret;
3413 struct iwl_scale_tbl_info *tbl;
3414 struct rs_rate *rate;
3415 struct iwl_lq_sta *lq_sta = file->private_data;
3416
3417 buff = kmalloc(1024, GFP_KERNEL);
3418 if (!buff)
3419 return -ENOMEM;
3420
3421 for (i = 0; i < LQ_SIZE; i++) {
3422 tbl = &(lq_sta->lq_info[i]);
3423 rate = &tbl->rate;
3424 desc += sprintf(buff+desc,
3425 "%s type=%d SGI=%d BW=%s DUP=0\n"
3426 "index=%d\n",
3427 lq_sta->active_tbl == i ? "*" : "x",
3428 rate->type,
3429 rate->sgi,
3430 is_ht20(rate) ? "20Mhz" :
3431 is_ht40(rate) ? "40Mhz" :
3432 is_ht80(rate) ? "80Mhz" : "ERR",
3433 rate->index);
3434 for (j = 0; j < IWL_RATE_COUNT; j++) {
3435 desc += sprintf(buff+desc,
3436 "counter=%d success=%d %%=%d\n",
3437 tbl->win[j].counter,
3438 tbl->win[j].success_counter,
3439 tbl->win[j].success_ratio);
3440 }
3441 }
3442 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3443 kfree(buff);
3444 return ret;
3445 }
3446
3447 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3448 .read = rs_sta_dbgfs_stats_table_read,
3449 .open = simple_open,
3450 .llseek = default_llseek,
3451 };
3452
3453 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3454 char __user *user_buf,
3455 size_t count, loff_t *ppos)
3456 {
3457 static const char * const column_name[] = {
3458 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3459 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3460 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3461 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3462 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3463 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3464 [RS_COLUMN_MIMO2] = "MIMO2",
3465 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3466 };
3467
3468 static const char * const rate_name[] = {
3469 [IWL_RATE_1M_INDEX] = "1M",
3470 [IWL_RATE_2M_INDEX] = "2M",
3471 [IWL_RATE_5M_INDEX] = "5.5M",
3472 [IWL_RATE_11M_INDEX] = "11M",
3473 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3474 [IWL_RATE_9M_INDEX] = "9M",
3475 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3476 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3477 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3478 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3479 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3480 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3481 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3482 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3483 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3484 };
3485
3486 char *buff, *pos, *endpos;
3487 int col, rate;
3488 ssize_t ret;
3489 struct iwl_lq_sta *lq_sta = file->private_data;
3490 struct rs_rate_stats *stats;
3491 static const size_t bufsz = 1024;
3492
3493 buff = kmalloc(bufsz, GFP_KERNEL);
3494 if (!buff)
3495 return -ENOMEM;
3496
3497 pos = buff;
3498 endpos = pos + bufsz;
3499
3500 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3501 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3502 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3503 pos += scnprintf(pos, endpos - pos, "\n");
3504
3505 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3506 pos += scnprintf(pos, endpos - pos,
3507 "%s,", column_name[col]);
3508
3509 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3510 stats = &(lq_sta->pers.tx_stats[col][rate]);
3511 pos += scnprintf(pos, endpos - pos,
3512 "%llu/%llu,",
3513 stats->success,
3514 stats->total);
3515 }
3516 pos += scnprintf(pos, endpos - pos, "\n");
3517 }
3518
3519 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3520 kfree(buff);
3521 return ret;
3522 }
3523
3524 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3525 const char __user *user_buf,
3526 size_t count, loff_t *ppos)
3527 {
3528 struct iwl_lq_sta *lq_sta = file->private_data;
3529 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3530
3531 return count;
3532 }
3533
3534 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3535 .read = rs_sta_dbgfs_drv_tx_stats_read,
3536 .write = rs_sta_dbgfs_drv_tx_stats_write,
3537 .open = simple_open,
3538 .llseek = default_llseek,
3539 };
3540
3541 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3542 char __user *user_buf,
3543 size_t count, loff_t *ppos)
3544 {
3545 struct iwl_lq_sta *lq_sta = file->private_data;
3546 char buf[12];
3547 int bufsz = sizeof(buf);
3548 int pos = 0;
3549 static const char * const ss_force_name[] = {
3550 [RS_SS_FORCE_NONE] = "none",
3551 [RS_SS_FORCE_STBC] = "stbc",
3552 [RS_SS_FORCE_BFER] = "bfer",
3553 [RS_SS_FORCE_SISO] = "siso",
3554 };
3555
3556 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3557 ss_force_name[lq_sta->ss_force]);
3558 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3559 }
3560
3561 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3562 size_t count, loff_t *ppos)
3563 {
3564 struct iwl_mvm *mvm = lq_sta->pers.drv;
3565 int ret = 0;
3566
3567 if (!strncmp("none", buf, 4)) {
3568 lq_sta->ss_force = RS_SS_FORCE_NONE;
3569 } else if (!strncmp("siso", buf, 4)) {
3570 lq_sta->ss_force = RS_SS_FORCE_SISO;
3571 } else if (!strncmp("stbc", buf, 4)) {
3572 if (lq_sta->stbc_capable) {
3573 lq_sta->ss_force = RS_SS_FORCE_STBC;
3574 } else {
3575 IWL_ERR(mvm,
3576 "can't force STBC. peer doesn't support\n");
3577 ret = -EINVAL;
3578 }
3579 } else if (!strncmp("bfer", buf, 4)) {
3580 if (lq_sta->bfer_capable) {
3581 lq_sta->ss_force = RS_SS_FORCE_BFER;
3582 } else {
3583 IWL_ERR(mvm,
3584 "can't force BFER. peer doesn't support\n");
3585 ret = -EINVAL;
3586 }
3587 } else {
3588 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3589 ret = -EINVAL;
3590 }
3591 return ret ?: count;
3592 }
3593
3594 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3595 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3596 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3597 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3598 &iwl_dbgfs_##name##_ops)) \
3599 goto err; \
3600 } while (0)
3601
3602 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3603
3604 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3605 {
3606 struct iwl_lq_sta *lq_sta = priv_sta;
3607 struct iwl_mvm_sta *mvmsta;
3608
3609 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3610
3611 if (!mvmsta->vif)
3612 return;
3613
3614 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3615 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3616 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3617 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3618 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3619 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3620 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3621 &lq_sta->tx_agg_tid_en);
3622 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3623 &lq_sta->pers.dbg_fixed_txp_reduction);
3624
3625 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3626 return;
3627 err:
3628 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3629 }
3630
3631 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3632 {
3633 }
3634 #endif
3635
3636 /*
3637 * Initialization of rate scaling information is done by driver after
3638 * the station is added. Since mac80211 calls this function before a
3639 * station is added we ignore it.
3640 */
3641 static void rs_rate_init_stub(void *mvm_r,
3642 struct ieee80211_supported_band *sband,
3643 struct cfg80211_chan_def *chandef,
3644 struct ieee80211_sta *sta, void *mvm_sta)
3645 {
3646 }
3647
3648 static const struct rate_control_ops rs_mvm_ops = {
3649 .name = RS_NAME,
3650 .tx_status = rs_mac80211_tx_status,
3651 .get_rate = rs_get_rate,
3652 .rate_init = rs_rate_init_stub,
3653 .alloc = rs_alloc,
3654 .free = rs_free,
3655 .alloc_sta = rs_alloc_sta,
3656 .free_sta = rs_free_sta,
3657 .rate_update = rs_rate_update,
3658 #ifdef CONFIG_MAC80211_DEBUGFS
3659 .add_sta_debugfs = rs_add_debugfs,
3660 .remove_sta_debugfs = rs_remove_debugfs,
3661 #endif
3662 };
3663
3664 int iwl_mvm_rate_control_register(void)
3665 {
3666 return ieee80211_rate_control_register(&rs_mvm_ops);
3667 }
3668
3669 void iwl_mvm_rate_control_unregister(void)
3670 {
3671 ieee80211_rate_control_unregister(&rs_mvm_ops);
3672 }
3673
3674 /**
3675 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3676 * Tx protection, according to this rquest and previous requests,
3677 * and send the LQ command.
3678 * @mvmsta: The station
3679 * @enable: Enable Tx protection?
3680 */
3681 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3682 bool enable)
3683 {
3684 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3685
3686 lockdep_assert_held(&mvm->mutex);
3687
3688 if (enable) {
3689 if (mvmsta->tx_protection == 0)
3690 lq->flags |= LQ_FLAG_USE_RTS_MSK;
3691 mvmsta->tx_protection++;
3692 } else {
3693 mvmsta->tx_protection--;
3694 if (mvmsta->tx_protection == 0)
3695 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3696 }
3697
3698 return iwl_mvm_send_lq_cmd(mvm, lq, false);
3699 }
Linux kernel - Deliverables
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