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[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 - 2015 Intel Mobile Communications GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 *
19 * The full GNU General Public License is included in this distribution in the
20 * file called LICENSE.
21 *
22 * Contact Information:
23 * Intel Linux Wireless <ilw@linux.intel.com>
24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *
26 *****************************************************************************/
27 #include <linux/kernel.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37 #include "rs.h"
38 #include "fw-api.h"
39 #include "sta.h"
40 #include "iwl-op-mode.h"
41 #include "mvm.h"
42 #include "debugfs.h"
43
44 #define RS_NAME "iwl-mvm-rs"
45
46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
47
48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
49 * Use this macro when dealing with thresholds consts set as a percentage
50 */
51 #define RS_PERCENT(x) (128 * x)
52
53 static u8 rs_ht_to_legacy[] = {
54 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
55 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
56 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
57 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
58 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
59 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
60 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
61 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 [ANT_NONE] = ANT_NONE,
68 [ANT_A] = ANT_B,
69 [ANT_B] = ANT_C,
70 [ANT_AB] = ANT_BC,
71 [ANT_C] = ANT_A,
72 [ANT_AC] = ANT_AB,
73 [ANT_BC] = ANT_AC,
74 [ANT_ABC] = ANT_ABC,
75 };
76
77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
83 IWL_RATE_##rp##M_INDEX, \
84 IWL_RATE_##rn##M_INDEX }
85
86 #define IWL_DECLARE_MCS_RATE(s) \
87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_INVM_INDEX, \
93 IWL_RATE_INVM_INDEX }
94
95 /*
96 * Parameter order:
97 * rate, ht rate, prev rate, next rate
98 *
99 * If there isn't a valid next or previous rate then INV is used which
100 * maps to IWL_RATE_INVALID
101 *
102 */
103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
104 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
105 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
106 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
107 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
109 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
119 };
120
121 enum rs_action {
122 RS_ACTION_STAY = 0,
123 RS_ACTION_DOWNSCALE = -1,
124 RS_ACTION_UPSCALE = 1,
125 };
126
127 enum rs_column_mode {
128 RS_INVALID = 0,
129 RS_LEGACY,
130 RS_SISO,
131 RS_MIMO2,
132 };
133
134 #define MAX_NEXT_COLUMNS 7
135 #define MAX_COLUMN_CHECKS 3
136
137 struct rs_tx_column;
138
139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
140 struct ieee80211_sta *sta,
141 struct rs_rate *rate,
142 const struct rs_tx_column *next_col);
143
144 struct rs_tx_column {
145 enum rs_column_mode mode;
146 u8 ant;
147 bool sgi;
148 enum rs_column next_columns[MAX_NEXT_COLUMNS];
149 allow_column_func_t checks[MAX_COLUMN_CHECKS];
150 };
151
152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
153 struct rs_rate *rate,
154 const struct rs_tx_column *next_col)
155 {
156 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
157 }
158
159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
160 struct rs_rate *rate,
161 const struct rs_tx_column *next_col)
162 {
163 struct iwl_mvm_sta *mvmsta;
164 struct iwl_mvm_vif *mvmvif;
165
166 if (!sta->ht_cap.ht_supported)
167 return false;
168
169 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
170 return false;
171
172 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
173 return false;
174
175 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
176 return false;
177
178 mvmsta = iwl_mvm_sta_from_mac80211(sta);
179 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
180 if (iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p)
181 return false;
182
183 if (mvm->nvm_data->sku_cap_mimo_disabled)
184 return false;
185
186 return true;
187 }
188
189 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
190 struct rs_rate *rate,
191 const struct rs_tx_column *next_col)
192 {
193 if (!sta->ht_cap.ht_supported)
194 return false;
195
196 return true;
197 }
198
199 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
200 struct rs_rate *rate,
201 const struct rs_tx_column *next_col)
202 {
203 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
204 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
205
206 if (is_ht20(rate) && (ht_cap->cap &
207 IEEE80211_HT_CAP_SGI_20))
208 return true;
209 if (is_ht40(rate) && (ht_cap->cap &
210 IEEE80211_HT_CAP_SGI_40))
211 return true;
212 if (is_ht80(rate) && (vht_cap->cap &
213 IEEE80211_VHT_CAP_SHORT_GI_80))
214 return true;
215
216 return false;
217 }
218
219 static const struct rs_tx_column rs_tx_columns[] = {
220 [RS_COLUMN_LEGACY_ANT_A] = {
221 .mode = RS_LEGACY,
222 .ant = ANT_A,
223 .next_columns = {
224 RS_COLUMN_LEGACY_ANT_B,
225 RS_COLUMN_SISO_ANT_A,
226 RS_COLUMN_MIMO2,
227 RS_COLUMN_INVALID,
228 RS_COLUMN_INVALID,
229 RS_COLUMN_INVALID,
230 RS_COLUMN_INVALID,
231 },
232 .checks = {
233 rs_ant_allow,
234 },
235 },
236 [RS_COLUMN_LEGACY_ANT_B] = {
237 .mode = RS_LEGACY,
238 .ant = ANT_B,
239 .next_columns = {
240 RS_COLUMN_LEGACY_ANT_A,
241 RS_COLUMN_SISO_ANT_B,
242 RS_COLUMN_MIMO2,
243 RS_COLUMN_INVALID,
244 RS_COLUMN_INVALID,
245 RS_COLUMN_INVALID,
246 RS_COLUMN_INVALID,
247 },
248 .checks = {
249 rs_ant_allow,
250 },
251 },
252 [RS_COLUMN_SISO_ANT_A] = {
253 .mode = RS_SISO,
254 .ant = ANT_A,
255 .next_columns = {
256 RS_COLUMN_SISO_ANT_B,
257 RS_COLUMN_MIMO2,
258 RS_COLUMN_SISO_ANT_A_SGI,
259 RS_COLUMN_LEGACY_ANT_A,
260 RS_COLUMN_LEGACY_ANT_B,
261 RS_COLUMN_INVALID,
262 RS_COLUMN_INVALID,
263 },
264 .checks = {
265 rs_siso_allow,
266 rs_ant_allow,
267 },
268 },
269 [RS_COLUMN_SISO_ANT_B] = {
270 .mode = RS_SISO,
271 .ant = ANT_B,
272 .next_columns = {
273 RS_COLUMN_SISO_ANT_A,
274 RS_COLUMN_MIMO2,
275 RS_COLUMN_SISO_ANT_B_SGI,
276 RS_COLUMN_LEGACY_ANT_A,
277 RS_COLUMN_LEGACY_ANT_B,
278 RS_COLUMN_INVALID,
279 RS_COLUMN_INVALID,
280 },
281 .checks = {
282 rs_siso_allow,
283 rs_ant_allow,
284 },
285 },
286 [RS_COLUMN_SISO_ANT_A_SGI] = {
287 .mode = RS_SISO,
288 .ant = ANT_A,
289 .sgi = true,
290 .next_columns = {
291 RS_COLUMN_SISO_ANT_B_SGI,
292 RS_COLUMN_MIMO2_SGI,
293 RS_COLUMN_SISO_ANT_A,
294 RS_COLUMN_LEGACY_ANT_A,
295 RS_COLUMN_LEGACY_ANT_B,
296 RS_COLUMN_INVALID,
297 RS_COLUMN_INVALID,
298 },
299 .checks = {
300 rs_siso_allow,
301 rs_ant_allow,
302 rs_sgi_allow,
303 },
304 },
305 [RS_COLUMN_SISO_ANT_B_SGI] = {
306 .mode = RS_SISO,
307 .ant = ANT_B,
308 .sgi = true,
309 .next_columns = {
310 RS_COLUMN_SISO_ANT_A_SGI,
311 RS_COLUMN_MIMO2_SGI,
312 RS_COLUMN_SISO_ANT_B,
313 RS_COLUMN_LEGACY_ANT_A,
314 RS_COLUMN_LEGACY_ANT_B,
315 RS_COLUMN_INVALID,
316 RS_COLUMN_INVALID,
317 },
318 .checks = {
319 rs_siso_allow,
320 rs_ant_allow,
321 rs_sgi_allow,
322 },
323 },
324 [RS_COLUMN_MIMO2] = {
325 .mode = RS_MIMO2,
326 .ant = ANT_AB,
327 .next_columns = {
328 RS_COLUMN_SISO_ANT_A,
329 RS_COLUMN_MIMO2_SGI,
330 RS_COLUMN_LEGACY_ANT_A,
331 RS_COLUMN_LEGACY_ANT_B,
332 RS_COLUMN_INVALID,
333 RS_COLUMN_INVALID,
334 RS_COLUMN_INVALID,
335 },
336 .checks = {
337 rs_mimo_allow,
338 },
339 },
340 [RS_COLUMN_MIMO2_SGI] = {
341 .mode = RS_MIMO2,
342 .ant = ANT_AB,
343 .sgi = true,
344 .next_columns = {
345 RS_COLUMN_SISO_ANT_A_SGI,
346 RS_COLUMN_MIMO2,
347 RS_COLUMN_LEGACY_ANT_A,
348 RS_COLUMN_LEGACY_ANT_B,
349 RS_COLUMN_INVALID,
350 RS_COLUMN_INVALID,
351 RS_COLUMN_INVALID,
352 },
353 .checks = {
354 rs_mimo_allow,
355 rs_sgi_allow,
356 },
357 },
358 };
359
360 static inline u8 rs_extract_rate(u32 rate_n_flags)
361 {
362 /* also works for HT because bits 7:6 are zero there */
363 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
364 }
365
366 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
367 {
368 int idx = 0;
369
370 if (rate_n_flags & RATE_MCS_HT_MSK) {
371 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
372 idx += IWL_RATE_MCS_0_INDEX;
373
374 /* skip 9M not supported in HT*/
375 if (idx >= IWL_RATE_9M_INDEX)
376 idx += 1;
377 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
378 return idx;
379 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
380 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
381 idx += IWL_RATE_MCS_0_INDEX;
382
383 /* skip 9M not supported in VHT*/
384 if (idx >= IWL_RATE_9M_INDEX)
385 idx++;
386 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
387 return idx;
388 } else {
389 /* legacy rate format, search for match in table */
390
391 u8 legacy_rate = rs_extract_rate(rate_n_flags);
392 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
393 if (iwl_rates[idx].plcp == legacy_rate)
394 return idx;
395 }
396
397 return IWL_RATE_INVALID;
398 }
399
400 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
401 struct ieee80211_sta *sta,
402 struct iwl_lq_sta *lq_sta,
403 int tid);
404 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
405 struct ieee80211_sta *sta,
406 struct iwl_lq_sta *lq_sta,
407 const struct rs_rate *initial_rate);
408 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
409
410 /**
411 * The following tables contain the expected throughput metrics for all rates
412 *
413 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
414 *
415 * where invalid entries are zeros.
416 *
417 * CCK rates are only valid in legacy table and will only be used in G
418 * (2.4 GHz) band.
419 */
420
421 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
422 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
423 };
424
425 /* Expected TpT tables. 4 indexes:
426 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
427 */
428 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
429 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
430 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
431 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
432 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
433 };
434
435 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
436 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
437 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
438 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
439 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
440 };
441
442 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
443 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
444 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
445 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
446 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
447 };
448
449 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
450 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
451 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
452 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
453 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
454 };
455
456 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
457 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
458 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
459 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
460 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
461 };
462
463 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
464 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
465 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
466 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
467 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
468 };
469
470 /* mbps, mcs */
471 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
472 { "1", "BPSK DSSS"},
473 { "2", "QPSK DSSS"},
474 {"5.5", "BPSK CCK"},
475 { "11", "QPSK CCK"},
476 { "6", "BPSK 1/2"},
477 { "9", "BPSK 1/2"},
478 { "12", "QPSK 1/2"},
479 { "18", "QPSK 3/4"},
480 { "24", "16QAM 1/2"},
481 { "36", "16QAM 3/4"},
482 { "48", "64QAM 2/3"},
483 { "54", "64QAM 3/4"},
484 { "60", "64QAM 5/6"},
485 };
486
487 #define MCS_INDEX_PER_STREAM (8)
488
489 static const char *rs_pretty_ant(u8 ant)
490 {
491 static const char * const ant_name[] = {
492 [ANT_NONE] = "None",
493 [ANT_A] = "A",
494 [ANT_B] = "B",
495 [ANT_AB] = "AB",
496 [ANT_C] = "C",
497 [ANT_AC] = "AC",
498 [ANT_BC] = "BC",
499 [ANT_ABC] = "ABC",
500 };
501
502 if (ant > ANT_ABC)
503 return "UNKNOWN";
504
505 return ant_name[ant];
506 }
507
508 static const char *rs_pretty_lq_type(enum iwl_table_type type)
509 {
510 static const char * const lq_types[] = {
511 [LQ_NONE] = "NONE",
512 [LQ_LEGACY_A] = "LEGACY_A",
513 [LQ_LEGACY_G] = "LEGACY_G",
514 [LQ_HT_SISO] = "HT SISO",
515 [LQ_HT_MIMO2] = "HT MIMO",
516 [LQ_VHT_SISO] = "VHT SISO",
517 [LQ_VHT_MIMO2] = "VHT MIMO",
518 };
519
520 if (type < LQ_NONE || type >= LQ_MAX)
521 return "UNKNOWN";
522
523 return lq_types[type];
524 }
525
526 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
527 const char *prefix)
528 {
529 IWL_DEBUG_RATE(mvm,
530 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
531 prefix, rs_pretty_lq_type(rate->type),
532 rate->index, rs_pretty_ant(rate->ant),
533 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
534 }
535
536 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
537 {
538 window->data = 0;
539 window->success_counter = 0;
540 window->success_ratio = IWL_INVALID_VALUE;
541 window->counter = 0;
542 window->average_tpt = IWL_INVALID_VALUE;
543 }
544
545 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
546 struct iwl_scale_tbl_info *tbl)
547 {
548 int i;
549
550 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
551 for (i = 0; i < IWL_RATE_COUNT; i++)
552 rs_rate_scale_clear_window(&tbl->win[i]);
553
554 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
555 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
556 }
557
558 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
559 {
560 return (ant_type & valid_antenna) == ant_type;
561 }
562
563 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
564 struct iwl_lq_sta *lq_data, u8 tid,
565 struct ieee80211_sta *sta)
566 {
567 int ret = -EAGAIN;
568
569 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
570 sta->addr, tid);
571 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
572 if (ret == -EAGAIN) {
573 /*
574 * driver and mac80211 is out of sync
575 * this might be cause by reloading firmware
576 * stop the tx ba session here
577 */
578 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
579 tid);
580 ieee80211_stop_tx_ba_session(sta, tid);
581 }
582 return ret;
583 }
584
585 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
586 struct iwl_lq_sta *lq_data,
587 struct ieee80211_sta *sta)
588 {
589 if (tid < IWL_MAX_TID_COUNT)
590 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
591 else
592 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
593 tid, IWL_MAX_TID_COUNT);
594 }
595
596 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
597 {
598 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
599 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
600 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
601 }
602
603 /*
604 * Static function to get the expected throughput from an iwl_scale_tbl_info
605 * that wraps a NULL pointer check
606 */
607 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
608 {
609 if (tbl->expected_tpt)
610 return tbl->expected_tpt[rs_index];
611 return 0;
612 }
613
614 /**
615 * rs_collect_tx_data - Update the success/failure sliding window
616 *
617 * We keep a sliding window of the last 62 packets transmitted
618 * at this rate. window->data contains the bitmask of successful
619 * packets.
620 */
621 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
622 struct iwl_scale_tbl_info *tbl,
623 int scale_index, int attempts, int successes,
624 struct iwl_rate_scale_data *window)
625 {
626 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
627 s32 fail_count, tpt;
628
629 /* Get expected throughput */
630 tpt = get_expected_tpt(tbl, scale_index);
631
632 /*
633 * Keep track of only the latest 62 tx frame attempts in this rate's
634 * history window; anything older isn't really relevant any more.
635 * If we have filled up the sliding window, drop the oldest attempt;
636 * if the oldest attempt (highest bit in bitmap) shows "success",
637 * subtract "1" from the success counter (this is the main reason
638 * we keep these bitmaps!).
639 */
640 while (attempts > 0) {
641 if (window->counter >= IWL_RATE_MAX_WINDOW) {
642 /* remove earliest */
643 window->counter = IWL_RATE_MAX_WINDOW - 1;
644
645 if (window->data & mask) {
646 window->data &= ~mask;
647 window->success_counter--;
648 }
649 }
650
651 /* Increment frames-attempted counter */
652 window->counter++;
653
654 /* Shift bitmap by one frame to throw away oldest history */
655 window->data <<= 1;
656
657 /* Mark the most recent #successes attempts as successful */
658 if (successes > 0) {
659 window->success_counter++;
660 window->data |= 0x1;
661 successes--;
662 }
663
664 attempts--;
665 }
666
667 /* Calculate current success ratio, avoid divide-by-0! */
668 if (window->counter > 0)
669 window->success_ratio = 128 * (100 * window->success_counter)
670 / window->counter;
671 else
672 window->success_ratio = IWL_INVALID_VALUE;
673
674 fail_count = window->counter - window->success_counter;
675
676 /* Calculate average throughput, if we have enough history. */
677 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
678 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
679 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
680 else
681 window->average_tpt = IWL_INVALID_VALUE;
682
683 return 0;
684 }
685
686 static int rs_collect_tx_data(struct iwl_mvm *mvm,
687 struct iwl_lq_sta *lq_sta,
688 struct iwl_scale_tbl_info *tbl,
689 int scale_index, int attempts, int successes,
690 u8 reduced_txp)
691 {
692 struct iwl_rate_scale_data *window = NULL;
693 int ret;
694
695 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
696 return -EINVAL;
697
698 if (tbl->column != RS_COLUMN_INVALID) {
699 struct lq_sta_pers *pers = &lq_sta->pers;
700
701 pers->tx_stats[tbl->column][scale_index].total += attempts;
702 pers->tx_stats[tbl->column][scale_index].success += successes;
703 }
704
705 /* Select window for current tx bit rate */
706 window = &(tbl->win[scale_index]);
707
708 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
709 window);
710 if (ret)
711 return ret;
712
713 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
714 return -EINVAL;
715
716 window = &tbl->tpc_win[reduced_txp];
717 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
718 window);
719 }
720
721 /* Convert rs_rate object into ucode rate bitmask */
722 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
723 struct rs_rate *rate)
724 {
725 u32 ucode_rate = 0;
726 int index = rate->index;
727
728 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
729 RATE_MCS_ANT_ABC_MSK);
730
731 if (is_legacy(rate)) {
732 ucode_rate |= iwl_rates[index].plcp;
733 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
734 ucode_rate |= RATE_MCS_CCK_MSK;
735 return ucode_rate;
736 }
737
738 if (is_ht(rate)) {
739 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
740 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
741 index = IWL_LAST_HT_RATE;
742 }
743 ucode_rate |= RATE_MCS_HT_MSK;
744
745 if (is_ht_siso(rate))
746 ucode_rate |= iwl_rates[index].plcp_ht_siso;
747 else if (is_ht_mimo2(rate))
748 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
749 else
750 WARN_ON_ONCE(1);
751 } else if (is_vht(rate)) {
752 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
753 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
754 index = IWL_LAST_VHT_RATE;
755 }
756 ucode_rate |= RATE_MCS_VHT_MSK;
757 if (is_vht_siso(rate))
758 ucode_rate |= iwl_rates[index].plcp_vht_siso;
759 else if (is_vht_mimo2(rate))
760 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
761 else
762 WARN_ON_ONCE(1);
763
764 } else {
765 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
766 }
767
768 if (is_siso(rate) && rate->stbc) {
769 /* To enable STBC we need to set both a flag and ANT_AB */
770 ucode_rate |= RATE_MCS_ANT_AB_MSK;
771 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
772 }
773
774 ucode_rate |= rate->bw;
775 if (rate->sgi)
776 ucode_rate |= RATE_MCS_SGI_MSK;
777 if (rate->ldpc)
778 ucode_rate |= RATE_MCS_LDPC_MSK;
779
780 return ucode_rate;
781 }
782
783 /* Convert a ucode rate into an rs_rate object */
784 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
785 enum ieee80211_band band,
786 struct rs_rate *rate)
787 {
788 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
789 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
790 u8 nss;
791
792 memset(rate, 0, sizeof(*rate));
793 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
794
795 if (rate->index == IWL_RATE_INVALID)
796 return -EINVAL;
797
798 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
799
800 /* Legacy */
801 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
802 !(ucode_rate & RATE_MCS_VHT_MSK)) {
803 if (num_of_ant == 1) {
804 if (band == IEEE80211_BAND_5GHZ)
805 rate->type = LQ_LEGACY_A;
806 else
807 rate->type = LQ_LEGACY_G;
808 }
809
810 return 0;
811 }
812
813 /* HT or VHT */
814 if (ucode_rate & RATE_MCS_SGI_MSK)
815 rate->sgi = true;
816 if (ucode_rate & RATE_MCS_LDPC_MSK)
817 rate->ldpc = true;
818 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
819 rate->stbc = true;
820 if (ucode_rate & RATE_MCS_BF_MSK)
821 rate->bfer = true;
822
823 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
824
825 if (ucode_rate & RATE_MCS_HT_MSK) {
826 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
827 RATE_HT_MCS_NSS_POS) + 1;
828
829 if (nss == 1) {
830 rate->type = LQ_HT_SISO;
831 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
832 "stbc %d bfer %d",
833 rate->stbc, rate->bfer);
834 } else if (nss == 2) {
835 rate->type = LQ_HT_MIMO2;
836 WARN_ON_ONCE(num_of_ant != 2);
837 } else {
838 WARN_ON_ONCE(1);
839 }
840 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
841 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
842 RATE_VHT_MCS_NSS_POS) + 1;
843
844 if (nss == 1) {
845 rate->type = LQ_VHT_SISO;
846 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
847 "stbc %d bfer %d",
848 rate->stbc, rate->bfer);
849 } else if (nss == 2) {
850 rate->type = LQ_VHT_MIMO2;
851 WARN_ON_ONCE(num_of_ant != 2);
852 } else {
853 WARN_ON_ONCE(1);
854 }
855 }
856
857 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
858 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
859 !is_vht(rate));
860
861 return 0;
862 }
863
864 /* switch to another antenna/antennas and return 1 */
865 /* if no other valid antenna found, return 0 */
866 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
867 {
868 u8 new_ant_type;
869
870 if (!rate->ant || rate->ant > ANT_ABC)
871 return 0;
872
873 if (!rs_is_valid_ant(valid_ant, rate->ant))
874 return 0;
875
876 new_ant_type = ant_toggle_lookup[rate->ant];
877
878 while ((new_ant_type != rate->ant) &&
879 !rs_is_valid_ant(valid_ant, new_ant_type))
880 new_ant_type = ant_toggle_lookup[new_ant_type];
881
882 if (new_ant_type == rate->ant)
883 return 0;
884
885 rate->ant = new_ant_type;
886
887 return 1;
888 }
889
890 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
891 struct rs_rate *rate)
892 {
893 if (is_legacy(rate))
894 return lq_sta->active_legacy_rate;
895 else if (is_siso(rate))
896 return lq_sta->active_siso_rate;
897 else if (is_mimo2(rate))
898 return lq_sta->active_mimo2_rate;
899
900 WARN_ON_ONCE(1);
901 return 0;
902 }
903
904 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
905 int rate_type)
906 {
907 u8 high = IWL_RATE_INVALID;
908 u8 low = IWL_RATE_INVALID;
909
910 /* 802.11A or ht walks to the next literal adjacent rate in
911 * the rate table */
912 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
913 int i;
914 u32 mask;
915
916 /* Find the previous rate that is in the rate mask */
917 i = index - 1;
918 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
919 if (rate_mask & mask) {
920 low = i;
921 break;
922 }
923 }
924
925 /* Find the next rate that is in the rate mask */
926 i = index + 1;
927 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
928 if (rate_mask & mask) {
929 high = i;
930 break;
931 }
932 }
933
934 return (high << 8) | low;
935 }
936
937 low = index;
938 while (low != IWL_RATE_INVALID) {
939 low = iwl_rates[low].prev_rs;
940 if (low == IWL_RATE_INVALID)
941 break;
942 if (rate_mask & (1 << low))
943 break;
944 }
945
946 high = index;
947 while (high != IWL_RATE_INVALID) {
948 high = iwl_rates[high].next_rs;
949 if (high == IWL_RATE_INVALID)
950 break;
951 if (rate_mask & (1 << high))
952 break;
953 }
954
955 return (high << 8) | low;
956 }
957
958 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
959 struct rs_rate *rate)
960 {
961 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
962 }
963
964 /* Get the next supported lower rate in the current column.
965 * Return true if bottom rate in the current column was reached
966 */
967 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
968 struct rs_rate *rate)
969 {
970 u8 low;
971 u16 high_low;
972 u16 rate_mask;
973 struct iwl_mvm *mvm = lq_sta->pers.drv;
974
975 rate_mask = rs_get_supported_rates(lq_sta, rate);
976 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
977 rate->type);
978 low = high_low & 0xff;
979
980 /* Bottom rate of column reached */
981 if (low == IWL_RATE_INVALID)
982 return true;
983
984 rate->index = low;
985 return false;
986 }
987
988 /* Get the next rate to use following a column downgrade */
989 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
990 struct rs_rate *rate)
991 {
992 struct iwl_mvm *mvm = lq_sta->pers.drv;
993
994 if (is_legacy(rate)) {
995 /* No column to downgrade from Legacy */
996 return;
997 } else if (is_siso(rate)) {
998 /* Downgrade to Legacy if we were in SISO */
999 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1000 rate->type = LQ_LEGACY_A;
1001 else
1002 rate->type = LQ_LEGACY_G;
1003
1004 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1005
1006 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1007 rate->index > IWL_RATE_MCS_9_INDEX);
1008
1009 rate->index = rs_ht_to_legacy[rate->index];
1010 rate->ldpc = false;
1011 } else {
1012 /* Downgrade to SISO with same MCS if in MIMO */
1013 rate->type = is_vht_mimo2(rate) ?
1014 LQ_VHT_SISO : LQ_HT_SISO;
1015 }
1016
1017 if (num_of_ant(rate->ant) > 1)
1018 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1019
1020 /* Relevant in both switching to SISO or Legacy */
1021 rate->sgi = false;
1022
1023 if (!rs_rate_supported(lq_sta, rate))
1024 rs_get_lower_rate_in_column(lq_sta, rate);
1025 }
1026
1027 /* Check if both rates are identical
1028 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1029 * with a rate indicating STBC/BFER and ANT_AB.
1030 */
1031 static inline bool rs_rate_equal(struct rs_rate *a,
1032 struct rs_rate *b,
1033 bool allow_ant_mismatch)
1034
1035 {
1036 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1037 (a->bfer == b->bfer);
1038
1039 if (allow_ant_mismatch) {
1040 if (a->stbc || a->bfer) {
1041 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1042 a->stbc, a->bfer, a->ant);
1043 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1044 } else if (b->stbc || b->bfer) {
1045 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1046 b->stbc, b->bfer, b->ant);
1047 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1048 }
1049 }
1050
1051 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1052 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1053 }
1054
1055 /* Check if both rates share the same column */
1056 static inline bool rs_rate_column_match(struct rs_rate *a,
1057 struct rs_rate *b)
1058 {
1059 bool ant_match;
1060
1061 if (a->stbc || a->bfer)
1062 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1063 else
1064 ant_match = (a->ant == b->ant);
1065
1066 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1067 && ant_match;
1068 }
1069
1070 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1071 {
1072 if (is_legacy(rate)) {
1073 if (rate->ant == ANT_A)
1074 return RS_COLUMN_LEGACY_ANT_A;
1075
1076 if (rate->ant == ANT_B)
1077 return RS_COLUMN_LEGACY_ANT_B;
1078
1079 goto err;
1080 }
1081
1082 if (is_siso(rate)) {
1083 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1084 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1085 RS_COLUMN_SISO_ANT_A;
1086
1087 if (rate->ant == ANT_B)
1088 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1089 RS_COLUMN_SISO_ANT_B;
1090
1091 goto err;
1092 }
1093
1094 if (is_mimo(rate))
1095 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1096
1097 err:
1098 return RS_COLUMN_INVALID;
1099 }
1100
1101 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1102 {
1103 u8 tid = IWL_MAX_TID_COUNT;
1104
1105 if (ieee80211_is_data_qos(hdr->frame_control)) {
1106 u8 *qc = ieee80211_get_qos_ctl(hdr);
1107 tid = qc[0] & 0xf;
1108 }
1109
1110 if (unlikely(tid > IWL_MAX_TID_COUNT))
1111 tid = IWL_MAX_TID_COUNT;
1112
1113 return tid;
1114 }
1115
1116 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1117 int tid, struct ieee80211_tx_info *info)
1118 {
1119 int legacy_success;
1120 int retries;
1121 int i;
1122 struct iwl_lq_cmd *table;
1123 u32 lq_hwrate;
1124 struct rs_rate lq_rate, tx_resp_rate;
1125 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1126 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1127 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1128 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1129 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1130 bool allow_ant_mismatch = mvm->fw->ucode_capa.api[0] &
1131 IWL_UCODE_TLV_API_LQ_SS_PARAMS;
1132
1133 /* Treat uninitialized rate scaling data same as non-existing. */
1134 if (!lq_sta) {
1135 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1136 return;
1137 } else if (!lq_sta->pers.drv) {
1138 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1139 return;
1140 }
1141
1142 /* This packet was aggregated but doesn't carry status info */
1143 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1144 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1145 return;
1146
1147 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1148
1149 #ifdef CONFIG_MAC80211_DEBUGFS
1150 /* Disable last tx check if we are debugging with fixed rate but
1151 * update tx stats */
1152 if (lq_sta->pers.dbg_fixed_rate) {
1153 int index = tx_resp_rate.index;
1154 enum rs_column column;
1155 int attempts, success;
1156
1157 column = rs_get_column_from_rate(&tx_resp_rate);
1158 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1159 "Can't map rate 0x%x to column",
1160 tx_resp_hwrate))
1161 return;
1162
1163 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1164 attempts = info->status.ampdu_len;
1165 success = info->status.ampdu_ack_len;
1166 } else {
1167 attempts = info->status.rates[0].count;
1168 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1169 }
1170
1171 lq_sta->pers.tx_stats[column][index].total += attempts;
1172 lq_sta->pers.tx_stats[column][index].success += success;
1173
1174 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1175 tx_resp_hwrate, success, attempts);
1176 return;
1177 }
1178 #endif
1179
1180 if (time_after(jiffies,
1181 (unsigned long)(lq_sta->last_tx +
1182 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1183 int t;
1184
1185 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1186 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1187 ieee80211_stop_tx_ba_session(sta, t);
1188
1189 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1190 return;
1191 }
1192 lq_sta->last_tx = jiffies;
1193
1194 /* Ignore this Tx frame response if its initial rate doesn't match
1195 * that of latest Link Quality command. There may be stragglers
1196 * from a previous Link Quality command, but we're no longer interested
1197 * in those; they're either from the "active" mode while we're trying
1198 * to check "search" mode, or a prior "search" mode after we've moved
1199 * to a new "search" mode (which might become the new "active" mode).
1200 */
1201 table = &lq_sta->lq;
1202 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1203 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1204
1205 /* Here we actually compare this rate to the latest LQ command */
1206 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1207 IWL_DEBUG_RATE(mvm,
1208 "initial tx resp rate 0x%x does not match 0x%x\n",
1209 tx_resp_hwrate, lq_hwrate);
1210
1211 /*
1212 * Since rates mis-match, the last LQ command may have failed.
1213 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1214 * ... driver.
1215 */
1216 lq_sta->missed_rate_counter++;
1217 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1218 lq_sta->missed_rate_counter = 0;
1219 IWL_DEBUG_RATE(mvm,
1220 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1221 lq_sta->rs_state);
1222 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1223 }
1224 /* Regardless, ignore this status info for outdated rate */
1225 return;
1226 } else
1227 /* Rate did match, so reset the missed_rate_counter */
1228 lq_sta->missed_rate_counter = 0;
1229
1230 if (!lq_sta->search_better_tbl) {
1231 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1232 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1233 } else {
1234 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1235 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1236 }
1237
1238 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1239 IWL_DEBUG_RATE(mvm,
1240 "Neither active nor search matches tx rate\n");
1241 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1242 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1243 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1244 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1245 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1246
1247 /*
1248 * no matching table found, let's by-pass the data collection
1249 * and continue to perform rate scale to find the rate table
1250 */
1251 rs_stay_in_table(lq_sta, true);
1252 goto done;
1253 }
1254
1255 /*
1256 * Updating the frame history depends on whether packets were
1257 * aggregated.
1258 *
1259 * For aggregation, all packets were transmitted at the same rate, the
1260 * first index into rate scale table.
1261 */
1262 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1263 /* ampdu_ack_len = 0 marks no BA was received. In this case
1264 * treat it as a single frame loss as we don't want the success
1265 * ratio to dip too quickly because a BA wasn't received
1266 */
1267 if (info->status.ampdu_ack_len == 0)
1268 info->status.ampdu_len = 1;
1269
1270 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1271 info->status.ampdu_len,
1272 info->status.ampdu_ack_len,
1273 reduced_txp);
1274
1275 /* Update success/fail counts if not searching for new mode */
1276 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1277 lq_sta->total_success += info->status.ampdu_ack_len;
1278 lq_sta->total_failed += (info->status.ampdu_len -
1279 info->status.ampdu_ack_len);
1280 }
1281 } else {
1282 /* For legacy, update frame history with for each Tx retry. */
1283 retries = info->status.rates[0].count - 1;
1284 /* HW doesn't send more than 15 retries */
1285 retries = min(retries, 15);
1286
1287 /* The last transmission may have been successful */
1288 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1289 /* Collect data for each rate used during failed TX attempts */
1290 for (i = 0; i <= retries; ++i) {
1291 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1292 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1293 &lq_rate);
1294 /*
1295 * Only collect stats if retried rate is in the same RS
1296 * table as active/search.
1297 */
1298 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1299 tmp_tbl = curr_tbl;
1300 else if (rs_rate_column_match(&lq_rate,
1301 &other_tbl->rate))
1302 tmp_tbl = other_tbl;
1303 else
1304 continue;
1305
1306 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1307 1, i < retries ? 0 : legacy_success,
1308 reduced_txp);
1309 }
1310
1311 /* Update success/fail counts if not searching for new mode */
1312 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1313 lq_sta->total_success += legacy_success;
1314 lq_sta->total_failed += retries + (1 - legacy_success);
1315 }
1316 }
1317 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1318 lq_sta->last_rate_n_flags = lq_hwrate;
1319 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1320 done:
1321 /* See if there's a better rate or modulation mode to try. */
1322 if (sta->supp_rates[info->band])
1323 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1324 }
1325
1326 /*
1327 * mac80211 sends us Tx status
1328 */
1329 static void rs_mac80211_tx_status(void *mvm_r,
1330 struct ieee80211_supported_band *sband,
1331 struct ieee80211_sta *sta, void *priv_sta,
1332 struct sk_buff *skb)
1333 {
1334 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1335 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1336 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1337 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1338
1339 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1340 return;
1341
1342 if (!ieee80211_is_data(hdr->frame_control) ||
1343 info->flags & IEEE80211_TX_CTL_NO_ACK)
1344 return;
1345
1346 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1347 }
1348
1349 /*
1350 * Begin a period of staying with a selected modulation mode.
1351 * Set "stay_in_tbl" flag to prevent any mode switches.
1352 * Set frame tx success limits according to legacy vs. high-throughput,
1353 * and reset overall (spanning all rates) tx success history statistics.
1354 * These control how long we stay using same modulation mode before
1355 * searching for a new mode.
1356 */
1357 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1358 struct iwl_lq_sta *lq_sta)
1359 {
1360 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1361 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1362 if (is_legacy) {
1363 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1364 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1365 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1366 } else {
1367 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1368 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1369 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1370 }
1371 lq_sta->table_count = 0;
1372 lq_sta->total_failed = 0;
1373 lq_sta->total_success = 0;
1374 lq_sta->flush_timer = jiffies;
1375 lq_sta->visited_columns = 0;
1376 }
1377
1378 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1379 {
1380 if (rate_mask)
1381 return find_last_bit(&rate_mask, BITS_PER_LONG);
1382 return IWL_RATE_INVALID;
1383 }
1384
1385 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1386 const struct rs_tx_column *column)
1387 {
1388 switch (column->mode) {
1389 case RS_LEGACY:
1390 return lq_sta->max_legacy_rate_idx;
1391 case RS_SISO:
1392 return lq_sta->max_siso_rate_idx;
1393 case RS_MIMO2:
1394 return lq_sta->max_mimo2_rate_idx;
1395 default:
1396 WARN_ON_ONCE(1);
1397 }
1398
1399 return lq_sta->max_legacy_rate_idx;
1400 }
1401
1402 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1403 const struct rs_tx_column *column,
1404 u32 bw)
1405 {
1406 /* Used to choose among HT tables */
1407 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1408
1409 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1410 column->mode != RS_SISO &&
1411 column->mode != RS_MIMO2))
1412 return expected_tpt_legacy;
1413
1414 /* Legacy rates have only one table */
1415 if (column->mode == RS_LEGACY)
1416 return expected_tpt_legacy;
1417
1418 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1419 /* Choose among many HT tables depending on number of streams
1420 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1421 * status */
1422 if (column->mode == RS_SISO) {
1423 switch (bw) {
1424 case RATE_MCS_CHAN_WIDTH_20:
1425 ht_tbl_pointer = expected_tpt_siso_20MHz;
1426 break;
1427 case RATE_MCS_CHAN_WIDTH_40:
1428 ht_tbl_pointer = expected_tpt_siso_40MHz;
1429 break;
1430 case RATE_MCS_CHAN_WIDTH_80:
1431 ht_tbl_pointer = expected_tpt_siso_80MHz;
1432 break;
1433 default:
1434 WARN_ON_ONCE(1);
1435 }
1436 } else if (column->mode == RS_MIMO2) {
1437 switch (bw) {
1438 case RATE_MCS_CHAN_WIDTH_20:
1439 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1440 break;
1441 case RATE_MCS_CHAN_WIDTH_40:
1442 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1443 break;
1444 case RATE_MCS_CHAN_WIDTH_80:
1445 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1446 break;
1447 default:
1448 WARN_ON_ONCE(1);
1449 }
1450 } else {
1451 WARN_ON_ONCE(1);
1452 }
1453
1454 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1455 return ht_tbl_pointer[0];
1456 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1457 return ht_tbl_pointer[1];
1458 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1459 return ht_tbl_pointer[2];
1460 else /* AGG+SGI */
1461 return ht_tbl_pointer[3];
1462 }
1463
1464 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1465 struct iwl_scale_tbl_info *tbl)
1466 {
1467 struct rs_rate *rate = &tbl->rate;
1468 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1469
1470 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1471 }
1472
1473 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1474 struct iwl_lq_sta *lq_sta,
1475 struct iwl_scale_tbl_info *tbl, /* "search" */
1476 unsigned long rate_mask, s8 index)
1477 {
1478 struct iwl_scale_tbl_info *active_tbl =
1479 &(lq_sta->lq_info[lq_sta->active_tbl]);
1480 s32 success_ratio = active_tbl->win[index].success_ratio;
1481 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1482 const u16 *tpt_tbl = tbl->expected_tpt;
1483 u16 high_low;
1484 u32 target_tpt;
1485 int rate_idx;
1486
1487 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1488 target_tpt = 100 * expected_current_tpt;
1489 IWL_DEBUG_RATE(mvm,
1490 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1491 success_ratio, target_tpt);
1492 } else {
1493 target_tpt = lq_sta->last_tpt;
1494 IWL_DEBUG_RATE(mvm,
1495 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1496 success_ratio, target_tpt);
1497 }
1498
1499 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1500
1501 while (rate_idx != IWL_RATE_INVALID) {
1502 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1503 break;
1504
1505 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1506 tbl->rate.type);
1507
1508 rate_idx = (high_low >> 8) & 0xff;
1509 }
1510
1511 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1512 rate_idx, target_tpt,
1513 rate_idx != IWL_RATE_INVALID ?
1514 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1515
1516 return rate_idx;
1517 }
1518
1519 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1520 {
1521 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1522 return RATE_MCS_CHAN_WIDTH_80;
1523 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1524 return RATE_MCS_CHAN_WIDTH_40;
1525
1526 return RATE_MCS_CHAN_WIDTH_20;
1527 }
1528
1529 /*
1530 * Check whether we should continue using same modulation mode, or
1531 * begin search for a new mode, based on:
1532 * 1) # tx successes or failures while using this mode
1533 * 2) # times calling this function
1534 * 3) elapsed time in this mode (not used, for now)
1535 */
1536 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1537 {
1538 struct iwl_scale_tbl_info *tbl;
1539 int active_tbl;
1540 int flush_interval_passed = 0;
1541 struct iwl_mvm *mvm;
1542
1543 mvm = lq_sta->pers.drv;
1544 active_tbl = lq_sta->active_tbl;
1545
1546 tbl = &(lq_sta->lq_info[active_tbl]);
1547
1548 /* If we've been disallowing search, see if we should now allow it */
1549 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1550 /* Elapsed time using current modulation mode */
1551 if (lq_sta->flush_timer)
1552 flush_interval_passed =
1553 time_after(jiffies,
1554 (unsigned long)(lq_sta->flush_timer +
1555 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1556
1557 /*
1558 * Check if we should allow search for new modulation mode.
1559 * If many frames have failed or succeeded, or we've used
1560 * this same modulation for a long time, allow search, and
1561 * reset history stats that keep track of whether we should
1562 * allow a new search. Also (below) reset all bitmaps and
1563 * stats in active history.
1564 */
1565 if (force_search ||
1566 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1567 (lq_sta->total_success > lq_sta->max_success_limit) ||
1568 ((!lq_sta->search_better_tbl) &&
1569 (lq_sta->flush_timer) && (flush_interval_passed))) {
1570 IWL_DEBUG_RATE(mvm,
1571 "LQ: stay is expired %d %d %d\n",
1572 lq_sta->total_failed,
1573 lq_sta->total_success,
1574 flush_interval_passed);
1575
1576 /* Allow search for new mode */
1577 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1578 IWL_DEBUG_RATE(mvm,
1579 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1580 lq_sta->total_failed = 0;
1581 lq_sta->total_success = 0;
1582 lq_sta->flush_timer = 0;
1583 /* mark the current column as visited */
1584 lq_sta->visited_columns = BIT(tbl->column);
1585 /*
1586 * Else if we've used this modulation mode enough repetitions
1587 * (regardless of elapsed time or success/failure), reset
1588 * history bitmaps and rate-specific stats for all rates in
1589 * active table.
1590 */
1591 } else {
1592 lq_sta->table_count++;
1593 if (lq_sta->table_count >=
1594 lq_sta->table_count_limit) {
1595 lq_sta->table_count = 0;
1596
1597 IWL_DEBUG_RATE(mvm,
1598 "LQ: stay in table clear win\n");
1599 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1600 }
1601 }
1602
1603 /* If transitioning to allow "search", reset all history
1604 * bitmaps and stats in active table (this will become the new
1605 * "search" table). */
1606 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1607 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1608 }
1609 }
1610 }
1611
1612 /*
1613 * setup rate table in uCode
1614 */
1615 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1616 struct ieee80211_sta *sta,
1617 struct iwl_lq_sta *lq_sta,
1618 struct iwl_scale_tbl_info *tbl)
1619 {
1620 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1621 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1622 }
1623
1624 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1625 struct iwl_lq_sta *lq_sta,
1626 struct ieee80211_sta *sta,
1627 struct iwl_scale_tbl_info *tbl)
1628 {
1629 int i, j, max_rate;
1630 enum rs_column next_col_id;
1631 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1632 const struct rs_tx_column *next_col;
1633 allow_column_func_t allow_func;
1634 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1635 const u16 *expected_tpt_tbl;
1636 u16 tpt, max_expected_tpt;
1637
1638 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1639 next_col_id = curr_col->next_columns[i];
1640
1641 if (next_col_id == RS_COLUMN_INVALID)
1642 continue;
1643
1644 if (lq_sta->visited_columns & BIT(next_col_id)) {
1645 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1646 next_col_id);
1647 continue;
1648 }
1649
1650 next_col = &rs_tx_columns[next_col_id];
1651
1652 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1653 IWL_DEBUG_RATE(mvm,
1654 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1655 next_col_id, valid_ants, next_col->ant);
1656 continue;
1657 }
1658
1659 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1660 allow_func = next_col->checks[j];
1661 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1662 next_col))
1663 break;
1664 }
1665
1666 if (j != MAX_COLUMN_CHECKS) {
1667 IWL_DEBUG_RATE(mvm,
1668 "Skip column %d: not allowed (check %d failed)\n",
1669 next_col_id, j);
1670
1671 continue;
1672 }
1673
1674 tpt = lq_sta->last_tpt / 100;
1675 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1676 rs_bw_from_sta_bw(sta));
1677 if (WARN_ON_ONCE(!expected_tpt_tbl))
1678 continue;
1679
1680 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1681 if (max_rate == IWL_RATE_INVALID) {
1682 IWL_DEBUG_RATE(mvm,
1683 "Skip column %d: no rate is allowed in this column\n",
1684 next_col_id);
1685 continue;
1686 }
1687
1688 max_expected_tpt = expected_tpt_tbl[max_rate];
1689 if (tpt >= max_expected_tpt) {
1690 IWL_DEBUG_RATE(mvm,
1691 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1692 next_col_id, max_expected_tpt, tpt);
1693 continue;
1694 }
1695
1696 IWL_DEBUG_RATE(mvm,
1697 "Found potential column %d. Max expected %d current %d\n",
1698 next_col_id, max_expected_tpt, tpt);
1699 break;
1700 }
1701
1702 if (i == MAX_NEXT_COLUMNS)
1703 return RS_COLUMN_INVALID;
1704
1705 return next_col_id;
1706 }
1707
1708 static int rs_switch_to_column(struct iwl_mvm *mvm,
1709 struct iwl_lq_sta *lq_sta,
1710 struct ieee80211_sta *sta,
1711 enum rs_column col_id)
1712 {
1713 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1714 struct iwl_scale_tbl_info *search_tbl =
1715 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1716 struct rs_rate *rate = &search_tbl->rate;
1717 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1718 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1719 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1720 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1721 unsigned long rate_mask = 0;
1722 u32 rate_idx = 0;
1723
1724 memcpy(search_tbl, tbl, sz);
1725
1726 rate->sgi = column->sgi;
1727 rate->ant = column->ant;
1728
1729 if (column->mode == RS_LEGACY) {
1730 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1731 rate->type = LQ_LEGACY_A;
1732 else
1733 rate->type = LQ_LEGACY_G;
1734
1735 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1736 rate->ldpc = false;
1737 rate_mask = lq_sta->active_legacy_rate;
1738 } else if (column->mode == RS_SISO) {
1739 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1740 rate_mask = lq_sta->active_siso_rate;
1741 } else if (column->mode == RS_MIMO2) {
1742 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1743 rate_mask = lq_sta->active_mimo2_rate;
1744 } else {
1745 WARN_ON_ONCE("Bad column mode");
1746 }
1747
1748 if (column->mode != RS_LEGACY) {
1749 rate->bw = rs_bw_from_sta_bw(sta);
1750 rate->ldpc = lq_sta->ldpc;
1751 }
1752
1753 search_tbl->column = col_id;
1754 rs_set_expected_tpt_table(lq_sta, search_tbl);
1755
1756 lq_sta->visited_columns |= BIT(col_id);
1757
1758 /* Get the best matching rate if we're changing modes. e.g.
1759 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1760 */
1761 if (curr_column->mode != column->mode) {
1762 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1763 rate_mask, rate->index);
1764
1765 if ((rate_idx == IWL_RATE_INVALID) ||
1766 !(BIT(rate_idx) & rate_mask)) {
1767 IWL_DEBUG_RATE(mvm,
1768 "can not switch with index %d"
1769 " rate mask %lx\n",
1770 rate_idx, rate_mask);
1771
1772 goto err;
1773 }
1774
1775 rate->index = rate_idx;
1776 }
1777
1778 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1779 col_id, rate->index);
1780
1781 return 0;
1782
1783 err:
1784 rate->type = LQ_NONE;
1785 return -1;
1786 }
1787
1788 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1789 struct iwl_scale_tbl_info *tbl,
1790 s32 sr, int low, int high,
1791 int current_tpt,
1792 int low_tpt, int high_tpt)
1793 {
1794 enum rs_action action = RS_ACTION_STAY;
1795
1796 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1797 (current_tpt == 0)) {
1798 IWL_DEBUG_RATE(mvm,
1799 "Decrease rate because of low SR\n");
1800 return RS_ACTION_DOWNSCALE;
1801 }
1802
1803 if ((low_tpt == IWL_INVALID_VALUE) &&
1804 (high_tpt == IWL_INVALID_VALUE) &&
1805 (high != IWL_RATE_INVALID)) {
1806 IWL_DEBUG_RATE(mvm,
1807 "No data about high/low rates. Increase rate\n");
1808 return RS_ACTION_UPSCALE;
1809 }
1810
1811 if ((high_tpt == IWL_INVALID_VALUE) &&
1812 (high != IWL_RATE_INVALID) &&
1813 (low_tpt != IWL_INVALID_VALUE) &&
1814 (low_tpt < current_tpt)) {
1815 IWL_DEBUG_RATE(mvm,
1816 "No data about high rate and low rate is worse. Increase rate\n");
1817 return RS_ACTION_UPSCALE;
1818 }
1819
1820 if ((high_tpt != IWL_INVALID_VALUE) &&
1821 (high_tpt > current_tpt)) {
1822 IWL_DEBUG_RATE(mvm,
1823 "Higher rate is better. Increate rate\n");
1824 return RS_ACTION_UPSCALE;
1825 }
1826
1827 if ((low_tpt != IWL_INVALID_VALUE) &&
1828 (high_tpt != IWL_INVALID_VALUE) &&
1829 (low_tpt < current_tpt) &&
1830 (high_tpt < current_tpt)) {
1831 IWL_DEBUG_RATE(mvm,
1832 "Both high and low are worse. Maintain rate\n");
1833 return RS_ACTION_STAY;
1834 }
1835
1836 if ((low_tpt != IWL_INVALID_VALUE) &&
1837 (low_tpt > current_tpt)) {
1838 IWL_DEBUG_RATE(mvm,
1839 "Lower rate is better\n");
1840 action = RS_ACTION_DOWNSCALE;
1841 goto out;
1842 }
1843
1844 if ((low_tpt == IWL_INVALID_VALUE) &&
1845 (low != IWL_RATE_INVALID)) {
1846 IWL_DEBUG_RATE(mvm,
1847 "No data about lower rate\n");
1848 action = RS_ACTION_DOWNSCALE;
1849 goto out;
1850 }
1851
1852 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1853
1854 out:
1855 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1856 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1857 IWL_DEBUG_RATE(mvm,
1858 "SR is above NO DECREASE. Avoid downscale\n");
1859 action = RS_ACTION_STAY;
1860 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1861 IWL_DEBUG_RATE(mvm,
1862 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1863 action = RS_ACTION_STAY;
1864 } else {
1865 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1866 }
1867 }
1868
1869 return action;
1870 }
1871
1872 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1873 struct iwl_lq_sta *lq_sta)
1874 {
1875 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1876 * supports STBC of at least 1*SS
1877 */
1878 if (!lq_sta->stbc_capable)
1879 return false;
1880
1881 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1882 return false;
1883
1884 return true;
1885 }
1886
1887 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1888 int *weaker, int *stronger)
1889 {
1890 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1891 if (*weaker > TPC_MAX_REDUCTION)
1892 *weaker = TPC_INVALID;
1893
1894 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1895 if (*stronger < 0)
1896 *stronger = TPC_INVALID;
1897 }
1898
1899 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1900 struct rs_rate *rate, enum ieee80211_band band)
1901 {
1902 int index = rate->index;
1903 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1904 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1905 !vif->bss_conf.ps);
1906
1907 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1908 cam, sta_ps_disabled);
1909 /*
1910 * allow tpc only if power management is enabled, or bt coex
1911 * activity grade allows it and we are on 2.4Ghz.
1912 */
1913 if ((cam || sta_ps_disabled) &&
1914 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1915 return false;
1916
1917 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1918 if (is_legacy(rate))
1919 return index == IWL_RATE_54M_INDEX;
1920 if (is_ht(rate))
1921 return index == IWL_RATE_MCS_7_INDEX;
1922 if (is_vht(rate))
1923 return index == IWL_RATE_MCS_7_INDEX ||
1924 index == IWL_RATE_MCS_8_INDEX ||
1925 index == IWL_RATE_MCS_9_INDEX;
1926
1927 WARN_ON_ONCE(1);
1928 return false;
1929 }
1930
1931 enum tpc_action {
1932 TPC_ACTION_STAY,
1933 TPC_ACTION_DECREASE,
1934 TPC_ACTION_INCREASE,
1935 TPC_ACTION_NO_RESTIRCTION,
1936 };
1937
1938 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1939 s32 sr, int weak, int strong,
1940 int current_tpt,
1941 int weak_tpt, int strong_tpt)
1942 {
1943 /* stay until we have valid tpt */
1944 if (current_tpt == IWL_INVALID_VALUE) {
1945 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1946 return TPC_ACTION_STAY;
1947 }
1948
1949 /* Too many failures, increase txp */
1950 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1951 current_tpt == 0) {
1952 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1953 return TPC_ACTION_NO_RESTIRCTION;
1954 }
1955
1956 /* try decreasing first if applicable */
1957 if (weak != TPC_INVALID) {
1958 if (weak_tpt == IWL_INVALID_VALUE &&
1959 (strong_tpt == IWL_INVALID_VALUE ||
1960 current_tpt >= strong_tpt)) {
1961 IWL_DEBUG_RATE(mvm,
1962 "no weak txp measurement. decrease txp\n");
1963 return TPC_ACTION_DECREASE;
1964 }
1965
1966 if (weak_tpt > current_tpt) {
1967 IWL_DEBUG_RATE(mvm,
1968 "lower txp has better tpt. decrease txp\n");
1969 return TPC_ACTION_DECREASE;
1970 }
1971 }
1972
1973 /* next, increase if needed */
1974 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1975 strong != TPC_INVALID) {
1976 if (weak_tpt == IWL_INVALID_VALUE &&
1977 strong_tpt != IWL_INVALID_VALUE &&
1978 current_tpt < strong_tpt) {
1979 IWL_DEBUG_RATE(mvm,
1980 "higher txp has better tpt. increase txp\n");
1981 return TPC_ACTION_INCREASE;
1982 }
1983
1984 if (weak_tpt < current_tpt &&
1985 (strong_tpt == IWL_INVALID_VALUE ||
1986 strong_tpt > current_tpt)) {
1987 IWL_DEBUG_RATE(mvm,
1988 "lower txp has worse tpt. increase txp\n");
1989 return TPC_ACTION_INCREASE;
1990 }
1991 }
1992
1993 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1994 return TPC_ACTION_STAY;
1995 }
1996
1997 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1998 struct ieee80211_sta *sta,
1999 struct iwl_lq_sta *lq_sta,
2000 struct iwl_scale_tbl_info *tbl)
2001 {
2002 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2003 struct ieee80211_vif *vif = mvm_sta->vif;
2004 struct ieee80211_chanctx_conf *chanctx_conf;
2005 enum ieee80211_band band;
2006 struct iwl_rate_scale_data *window;
2007 struct rs_rate *rate = &tbl->rate;
2008 enum tpc_action action;
2009 s32 sr;
2010 u8 cur = lq_sta->lq.reduced_tpc;
2011 int current_tpt;
2012 int weak, strong;
2013 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2014
2015 #ifdef CONFIG_MAC80211_DEBUGFS
2016 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2017 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2018 lq_sta->pers.dbg_fixed_txp_reduction);
2019 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2020 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2021 }
2022 #endif
2023
2024 rcu_read_lock();
2025 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2026 if (WARN_ON(!chanctx_conf))
2027 band = IEEE80211_NUM_BANDS;
2028 else
2029 band = chanctx_conf->def.chan->band;
2030 rcu_read_unlock();
2031
2032 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2033 IWL_DEBUG_RATE(mvm,
2034 "tpc is not allowed. remove txp restrictions\n");
2035 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2036 return cur != TPC_NO_REDUCTION;
2037 }
2038
2039 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2040
2041 /* Collect measured throughputs for current and adjacent rates */
2042 window = tbl->tpc_win;
2043 sr = window[cur].success_ratio;
2044 current_tpt = window[cur].average_tpt;
2045 if (weak != TPC_INVALID)
2046 weak_tpt = window[weak].average_tpt;
2047 if (strong != TPC_INVALID)
2048 strong_tpt = window[strong].average_tpt;
2049
2050 IWL_DEBUG_RATE(mvm,
2051 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2052 cur, current_tpt, sr, weak, strong,
2053 weak_tpt, strong_tpt);
2054
2055 action = rs_get_tpc_action(mvm, sr, weak, strong,
2056 current_tpt, weak_tpt, strong_tpt);
2057
2058 /* override actions if we are on the edge */
2059 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2060 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2061 action = TPC_ACTION_STAY;
2062 } else if (strong == TPC_INVALID &&
2063 (action == TPC_ACTION_INCREASE ||
2064 action == TPC_ACTION_NO_RESTIRCTION)) {
2065 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2066 action = TPC_ACTION_STAY;
2067 }
2068
2069 switch (action) {
2070 case TPC_ACTION_DECREASE:
2071 lq_sta->lq.reduced_tpc = weak;
2072 return true;
2073 case TPC_ACTION_INCREASE:
2074 lq_sta->lq.reduced_tpc = strong;
2075 return true;
2076 case TPC_ACTION_NO_RESTIRCTION:
2077 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2078 return true;
2079 case TPC_ACTION_STAY:
2080 /* do nothing */
2081 break;
2082 }
2083 return false;
2084 }
2085
2086 /*
2087 * Do rate scaling and search for new modulation mode.
2088 */
2089 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2090 struct ieee80211_sta *sta,
2091 struct iwl_lq_sta *lq_sta,
2092 int tid)
2093 {
2094 int low = IWL_RATE_INVALID;
2095 int high = IWL_RATE_INVALID;
2096 int index;
2097 struct iwl_rate_scale_data *window = NULL;
2098 int current_tpt = IWL_INVALID_VALUE;
2099 int low_tpt = IWL_INVALID_VALUE;
2100 int high_tpt = IWL_INVALID_VALUE;
2101 u32 fail_count;
2102 enum rs_action scale_action = RS_ACTION_STAY;
2103 u16 rate_mask;
2104 u8 update_lq = 0;
2105 struct iwl_scale_tbl_info *tbl, *tbl1;
2106 u8 active_tbl = 0;
2107 u8 done_search = 0;
2108 u16 high_low;
2109 s32 sr;
2110 u8 prev_agg = lq_sta->is_agg;
2111 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2112 struct iwl_mvm_tid_data *tid_data;
2113 struct rs_rate *rate;
2114
2115 lq_sta->is_agg = !!sta_priv->agg_tids;
2116
2117 /*
2118 * Select rate-scale / modulation-mode table to work with in
2119 * the rest of this function: "search" if searching for better
2120 * modulation mode, or "active" if doing rate scaling within a mode.
2121 */
2122 if (!lq_sta->search_better_tbl)
2123 active_tbl = lq_sta->active_tbl;
2124 else
2125 active_tbl = 1 - lq_sta->active_tbl;
2126
2127 tbl = &(lq_sta->lq_info[active_tbl]);
2128 rate = &tbl->rate;
2129
2130 if (prev_agg != lq_sta->is_agg) {
2131 IWL_DEBUG_RATE(mvm,
2132 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2133 prev_agg, lq_sta->is_agg);
2134 rs_set_expected_tpt_table(lq_sta, tbl);
2135 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2136 }
2137
2138 /* current tx rate */
2139 index = rate->index;
2140
2141 /* rates available for this association, and for modulation mode */
2142 rate_mask = rs_get_supported_rates(lq_sta, rate);
2143
2144 if (!(BIT(index) & rate_mask)) {
2145 IWL_ERR(mvm, "Current Rate is not valid\n");
2146 if (lq_sta->search_better_tbl) {
2147 /* revert to active table if search table is not valid*/
2148 rate->type = LQ_NONE;
2149 lq_sta->search_better_tbl = 0;
2150 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2151 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2152 }
2153 return;
2154 }
2155
2156 /* Get expected throughput table and history window for current rate */
2157 if (!tbl->expected_tpt) {
2158 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2159 return;
2160 }
2161
2162 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2163 window = &(tbl->win[index]);
2164
2165 /*
2166 * If there is not enough history to calculate actual average
2167 * throughput, keep analyzing results of more tx frames, without
2168 * changing rate or mode (bypass most of the rest of this function).
2169 * Set up new rate table in uCode only if old rate is not supported
2170 * in current association (use new rate found above).
2171 */
2172 fail_count = window->counter - window->success_counter;
2173 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2174 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2175 IWL_DEBUG_RATE(mvm,
2176 "(%s: %d): Test Window: succ %d total %d\n",
2177 rs_pretty_lq_type(rate->type),
2178 index, window->success_counter, window->counter);
2179
2180 /* Can't calculate this yet; not enough history */
2181 window->average_tpt = IWL_INVALID_VALUE;
2182
2183 /* Should we stay with this modulation mode,
2184 * or search for a new one? */
2185 rs_stay_in_table(lq_sta, false);
2186
2187 return;
2188 }
2189
2190 /* If we are searching for better modulation mode, check success. */
2191 if (lq_sta->search_better_tbl) {
2192 /* If good success, continue using the "search" mode;
2193 * no need to send new link quality command, since we're
2194 * continuing to use the setup that we've been trying. */
2195 if (window->average_tpt > lq_sta->last_tpt) {
2196 IWL_DEBUG_RATE(mvm,
2197 "SWITCHING TO NEW TABLE SR: %d "
2198 "cur-tpt %d old-tpt %d\n",
2199 window->success_ratio,
2200 window->average_tpt,
2201 lq_sta->last_tpt);
2202
2203 /* Swap tables; "search" becomes "active" */
2204 lq_sta->active_tbl = active_tbl;
2205 current_tpt = window->average_tpt;
2206 /* Else poor success; go back to mode in "active" table */
2207 } else {
2208 IWL_DEBUG_RATE(mvm,
2209 "GOING BACK TO THE OLD TABLE: SR %d "
2210 "cur-tpt %d old-tpt %d\n",
2211 window->success_ratio,
2212 window->average_tpt,
2213 lq_sta->last_tpt);
2214
2215 /* Nullify "search" table */
2216 rate->type = LQ_NONE;
2217
2218 /* Revert to "active" table */
2219 active_tbl = lq_sta->active_tbl;
2220 tbl = &(lq_sta->lq_info[active_tbl]);
2221
2222 /* Revert to "active" rate and throughput info */
2223 index = tbl->rate.index;
2224 current_tpt = lq_sta->last_tpt;
2225
2226 /* Need to set up a new rate table in uCode */
2227 update_lq = 1;
2228 }
2229
2230 /* Either way, we've made a decision; modulation mode
2231 * search is done, allow rate adjustment next time. */
2232 lq_sta->search_better_tbl = 0;
2233 done_search = 1; /* Don't switch modes below! */
2234 goto lq_update;
2235 }
2236
2237 /* (Else) not in search of better modulation mode, try for better
2238 * starting rate, while staying in this mode. */
2239 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2240 low = high_low & 0xff;
2241 high = (high_low >> 8) & 0xff;
2242
2243 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2244
2245 sr = window->success_ratio;
2246
2247 /* Collect measured throughputs for current and adjacent rates */
2248 current_tpt = window->average_tpt;
2249 if (low != IWL_RATE_INVALID)
2250 low_tpt = tbl->win[low].average_tpt;
2251 if (high != IWL_RATE_INVALID)
2252 high_tpt = tbl->win[high].average_tpt;
2253
2254 IWL_DEBUG_RATE(mvm,
2255 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2256 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2257 low, high, low_tpt, high_tpt);
2258
2259 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2260 current_tpt, low_tpt, high_tpt);
2261
2262 /* Force a search in case BT doesn't like us being in MIMO */
2263 if (is_mimo(rate) &&
2264 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2265 IWL_DEBUG_RATE(mvm,
2266 "BT Coex forbids MIMO. Search for new config\n");
2267 rs_stay_in_table(lq_sta, true);
2268 goto lq_update;
2269 }
2270
2271 switch (scale_action) {
2272 case RS_ACTION_DOWNSCALE:
2273 /* Decrease starting rate, update uCode's rate table */
2274 if (low != IWL_RATE_INVALID) {
2275 update_lq = 1;
2276 index = low;
2277 } else {
2278 IWL_DEBUG_RATE(mvm,
2279 "At the bottom rate. Can't decrease\n");
2280 }
2281
2282 break;
2283 case RS_ACTION_UPSCALE:
2284 /* Increase starting rate, update uCode's rate table */
2285 if (high != IWL_RATE_INVALID) {
2286 update_lq = 1;
2287 index = high;
2288 } else {
2289 IWL_DEBUG_RATE(mvm,
2290 "At the top rate. Can't increase\n");
2291 }
2292
2293 break;
2294 case RS_ACTION_STAY:
2295 /* No change */
2296 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2297 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2298 break;
2299 default:
2300 break;
2301 }
2302
2303 lq_update:
2304 /* Replace uCode's rate table for the destination station. */
2305 if (update_lq) {
2306 tbl->rate.index = index;
2307 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2308 }
2309
2310 rs_stay_in_table(lq_sta, false);
2311
2312 /*
2313 * Search for new modulation mode if we're:
2314 * 1) Not changing rates right now
2315 * 2) Not just finishing up a search
2316 * 3) Allowing a new search
2317 */
2318 if (!update_lq && !done_search &&
2319 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2320 && window->counter) {
2321 enum rs_column next_column;
2322
2323 /* Save current throughput to compare with "search" throughput*/
2324 lq_sta->last_tpt = current_tpt;
2325
2326 IWL_DEBUG_RATE(mvm,
2327 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2328 update_lq, done_search, lq_sta->rs_state,
2329 window->counter);
2330
2331 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2332 if (next_column != RS_COLUMN_INVALID) {
2333 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2334 next_column);
2335 if (!ret)
2336 lq_sta->search_better_tbl = 1;
2337 } else {
2338 IWL_DEBUG_RATE(mvm,
2339 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2340 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2341 }
2342
2343 /* If new "search" mode was selected, set up in uCode table */
2344 if (lq_sta->search_better_tbl) {
2345 /* Access the "search" table, clear its history. */
2346 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2347 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2348
2349 /* Use new "search" start rate */
2350 index = tbl->rate.index;
2351
2352 rs_dump_rate(mvm, &tbl->rate,
2353 "Switch to SEARCH TABLE:");
2354 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2355 } else {
2356 done_search = 1;
2357 }
2358 }
2359
2360 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2361 /* If the "active" (non-search) mode was legacy,
2362 * and we've tried switching antennas,
2363 * but we haven't been able to try HT modes (not available),
2364 * stay with best antenna legacy modulation for a while
2365 * before next round of mode comparisons. */
2366 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2367 if (is_legacy(&tbl1->rate)) {
2368 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2369
2370 if (tid != IWL_MAX_TID_COUNT) {
2371 tid_data = &sta_priv->tid_data[tid];
2372 if (tid_data->state != IWL_AGG_OFF) {
2373 IWL_DEBUG_RATE(mvm,
2374 "Stop aggregation on tid %d\n",
2375 tid);
2376 ieee80211_stop_tx_ba_session(sta, tid);
2377 }
2378 }
2379 rs_set_stay_in_table(mvm, 1, lq_sta);
2380 } else {
2381 /* If we're in an HT mode, and all 3 mode switch actions
2382 * have been tried and compared, stay in this best modulation
2383 * mode for a while before next round of mode comparisons. */
2384 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2385 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2386 (tid != IWL_MAX_TID_COUNT)) {
2387 tid_data = &sta_priv->tid_data[tid];
2388 if (tid_data->state == IWL_AGG_OFF) {
2389 IWL_DEBUG_RATE(mvm,
2390 "try to aggregate tid %d\n",
2391 tid);
2392 rs_tl_turn_on_agg(mvm, tid,
2393 lq_sta, sta);
2394 }
2395 }
2396 rs_set_stay_in_table(mvm, 0, lq_sta);
2397 }
2398 }
2399 }
2400
2401 struct rs_init_rate_info {
2402 s8 rssi;
2403 u8 rate_idx;
2404 };
2405
2406 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2407 { -60, IWL_RATE_54M_INDEX },
2408 { -64, IWL_RATE_48M_INDEX },
2409 { -68, IWL_RATE_36M_INDEX },
2410 { -80, IWL_RATE_24M_INDEX },
2411 { -84, IWL_RATE_18M_INDEX },
2412 { -85, IWL_RATE_12M_INDEX },
2413 { -86, IWL_RATE_11M_INDEX },
2414 { -88, IWL_RATE_5M_INDEX },
2415 { -90, IWL_RATE_2M_INDEX },
2416 { S8_MIN, IWL_RATE_1M_INDEX },
2417 };
2418
2419 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2420 { -60, IWL_RATE_54M_INDEX },
2421 { -64, IWL_RATE_48M_INDEX },
2422 { -72, IWL_RATE_36M_INDEX },
2423 { -80, IWL_RATE_24M_INDEX },
2424 { -84, IWL_RATE_18M_INDEX },
2425 { -85, IWL_RATE_12M_INDEX },
2426 { -87, IWL_RATE_9M_INDEX },
2427 { S8_MIN, IWL_RATE_6M_INDEX },
2428 };
2429
2430 /* Choose an initial legacy rate and antenna to use based on the RSSI
2431 * of last Rx
2432 */
2433 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2434 struct iwl_lq_sta *lq_sta,
2435 enum ieee80211_band band,
2436 struct rs_rate *rate)
2437 {
2438 int i, nentries;
2439 s8 best_rssi = S8_MIN;
2440 u8 best_ant = ANT_NONE;
2441 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2442 const struct rs_init_rate_info *initial_rates;
2443
2444 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2445 if (!(lq_sta->pers.chains & BIT(i)))
2446 continue;
2447
2448 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2449 best_rssi = lq_sta->pers.chain_signal[i];
2450 best_ant = BIT(i);
2451 }
2452 }
2453
2454 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2455 rs_pretty_ant(best_ant), best_rssi);
2456
2457 if (best_ant != ANT_A && best_ant != ANT_B)
2458 rate->ant = first_antenna(valid_tx_ant);
2459 else
2460 rate->ant = best_ant;
2461
2462 rate->sgi = false;
2463 rate->ldpc = false;
2464 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2465
2466 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2467 BITS_PER_LONG);
2468
2469 if (band == IEEE80211_BAND_5GHZ) {
2470 rate->type = LQ_LEGACY_A;
2471 initial_rates = rs_init_rates_5ghz;
2472 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2473 } else {
2474 rate->type = LQ_LEGACY_G;
2475 initial_rates = rs_init_rates_24ghz;
2476 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2477 }
2478
2479 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2480 for (i = 0; i < nentries; i++) {
2481 int rate_idx = initial_rates[i].rate_idx;
2482 if ((best_rssi >= initial_rates[i].rssi) &&
2483 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2484 rate->index = rate_idx;
2485 break;
2486 }
2487 }
2488 }
2489
2490 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2491 rs_pretty_ant(rate->ant));
2492 }
2493
2494 /* Save info about RSSI of last Rx */
2495 void rs_update_last_rssi(struct iwl_mvm *mvm,
2496 struct iwl_lq_sta *lq_sta,
2497 struct ieee80211_rx_status *rx_status)
2498 {
2499 lq_sta->pers.chains = rx_status->chains;
2500 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2501 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2502 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2503 }
2504
2505 /**
2506 * rs_initialize_lq - Initialize a station's hardware rate table
2507 *
2508 * The uCode's station table contains a table of fallback rates
2509 * for automatic fallback during transmission.
2510 *
2511 * NOTE: This sets up a default set of values. These will be replaced later
2512 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2513 * rc80211_simple.
2514 *
2515 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2516 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2517 * which requires station table entry to exist).
2518 */
2519 static void rs_initialize_lq(struct iwl_mvm *mvm,
2520 struct ieee80211_sta *sta,
2521 struct iwl_lq_sta *lq_sta,
2522 enum ieee80211_band band,
2523 bool init)
2524 {
2525 struct iwl_scale_tbl_info *tbl;
2526 struct rs_rate *rate;
2527 u8 active_tbl = 0;
2528
2529 if (!sta || !lq_sta)
2530 return;
2531
2532 if (!lq_sta->search_better_tbl)
2533 active_tbl = lq_sta->active_tbl;
2534 else
2535 active_tbl = 1 - lq_sta->active_tbl;
2536
2537 tbl = &(lq_sta->lq_info[active_tbl]);
2538 rate = &tbl->rate;
2539
2540 rs_get_initial_rate(mvm, lq_sta, band, rate);
2541
2542 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2543 if (rate->ant == ANT_A)
2544 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2545 else
2546 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2547
2548 rs_set_expected_tpt_table(lq_sta, tbl);
2549 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2550 /* TODO restore station should remember the lq cmd */
2551 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2552 }
2553
2554 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2555 struct ieee80211_tx_rate_control *txrc)
2556 {
2557 struct sk_buff *skb = txrc->skb;
2558 struct iwl_op_mode *op_mode __maybe_unused =
2559 (struct iwl_op_mode *)mvm_r;
2560 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2561 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2562 struct iwl_lq_sta *lq_sta = mvm_sta;
2563
2564 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2565 /* if vif isn't initialized mvm doesn't know about
2566 * this station, so don't do anything with the it
2567 */
2568 sta = NULL;
2569 mvm_sta = NULL;
2570 }
2571
2572 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2573
2574 /* Treat uninitialized rate scaling data same as non-existing. */
2575 if (lq_sta && !lq_sta->pers.drv) {
2576 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2577 mvm_sta = NULL;
2578 }
2579
2580 /* Send management frames and NO_ACK data using lowest rate. */
2581 if (rate_control_send_low(sta, mvm_sta, txrc))
2582 return;
2583
2584 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2585 info->band, &info->control.rates[0]);
2586
2587 info->control.rates[0].count = 1;
2588 }
2589
2590 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2591 gfp_t gfp)
2592 {
2593 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2594 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2595 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2596 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2597
2598 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2599
2600 lq_sta->pers.drv = mvm;
2601 #ifdef CONFIG_MAC80211_DEBUGFS
2602 lq_sta->pers.dbg_fixed_rate = 0;
2603 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2604 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2605 #endif
2606 lq_sta->pers.chains = 0;
2607 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2608
2609 return &sta_priv->lq_sta;
2610 }
2611
2612 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2613 int nss)
2614 {
2615 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2616 (0x3 << (2 * (nss - 1)));
2617 rx_mcs >>= (2 * (nss - 1));
2618
2619 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2620 return IWL_RATE_MCS_7_INDEX;
2621 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2622 return IWL_RATE_MCS_8_INDEX;
2623 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2624 return IWL_RATE_MCS_9_INDEX;
2625
2626 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2627 return -1;
2628 }
2629
2630 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2631 struct ieee80211_sta_vht_cap *vht_cap,
2632 struct iwl_lq_sta *lq_sta)
2633 {
2634 int i;
2635 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2636
2637 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2638 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2639 if (i == IWL_RATE_9M_INDEX)
2640 continue;
2641
2642 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2643 if (i == IWL_RATE_MCS_9_INDEX &&
2644 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2645 continue;
2646
2647 lq_sta->active_siso_rate |= BIT(i);
2648 }
2649 }
2650
2651 if (sta->rx_nss < 2)
2652 return;
2653
2654 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2655 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2656 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2657 if (i == IWL_RATE_9M_INDEX)
2658 continue;
2659
2660 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2661 if (i == IWL_RATE_MCS_9_INDEX &&
2662 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2663 continue;
2664
2665 lq_sta->active_mimo2_rate |= BIT(i);
2666 }
2667 }
2668 }
2669
2670 static void rs_ht_init(struct iwl_mvm *mvm,
2671 struct ieee80211_sta *sta,
2672 struct iwl_lq_sta *lq_sta,
2673 struct ieee80211_sta_ht_cap *ht_cap)
2674 {
2675 /* active_siso_rate mask includes 9 MBits (bit 5),
2676 * and CCK (bits 0-3), supp_rates[] does not;
2677 * shift to convert format, force 9 MBits off.
2678 */
2679 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2680 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2681 lq_sta->active_siso_rate &= ~((u16)0x2);
2682 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2683
2684 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2685 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2686 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2687 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2688
2689 if (mvm->cfg->ht_params->ldpc &&
2690 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2691 lq_sta->ldpc = true;
2692
2693 if (mvm->cfg->ht_params->stbc &&
2694 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2695 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2696 lq_sta->stbc_capable = true;
2697
2698 lq_sta->is_vht = false;
2699 }
2700
2701 static void rs_vht_init(struct iwl_mvm *mvm,
2702 struct ieee80211_sta *sta,
2703 struct iwl_lq_sta *lq_sta,
2704 struct ieee80211_sta_vht_cap *vht_cap)
2705 {
2706 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2707
2708 if (mvm->cfg->ht_params->ldpc &&
2709 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2710 lq_sta->ldpc = true;
2711
2712 if (mvm->cfg->ht_params->stbc &&
2713 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2714 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2715 lq_sta->stbc_capable = true;
2716
2717 if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2718 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2719 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2720 lq_sta->bfer_capable = true;
2721
2722 lq_sta->is_vht = true;
2723 }
2724
2725 #ifdef CONFIG_IWLWIFI_DEBUGFS
2726 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2727 {
2728 spin_lock_bh(&mvm->drv_stats_lock);
2729 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2730 spin_unlock_bh(&mvm->drv_stats_lock);
2731 }
2732
2733 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2734 {
2735 u8 nss = 0, mcs = 0;
2736
2737 spin_lock(&mvm->drv_stats_lock);
2738
2739 if (agg)
2740 mvm->drv_rx_stats.agg_frames++;
2741
2742 mvm->drv_rx_stats.success_frames++;
2743
2744 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2745 case RATE_MCS_CHAN_WIDTH_20:
2746 mvm->drv_rx_stats.bw_20_frames++;
2747 break;
2748 case RATE_MCS_CHAN_WIDTH_40:
2749 mvm->drv_rx_stats.bw_40_frames++;
2750 break;
2751 case RATE_MCS_CHAN_WIDTH_80:
2752 mvm->drv_rx_stats.bw_80_frames++;
2753 break;
2754 default:
2755 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2756 }
2757
2758 if (rate & RATE_MCS_HT_MSK) {
2759 mvm->drv_rx_stats.ht_frames++;
2760 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2761 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2762 } else if (rate & RATE_MCS_VHT_MSK) {
2763 mvm->drv_rx_stats.vht_frames++;
2764 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2765 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2766 RATE_VHT_MCS_NSS_POS) + 1;
2767 } else {
2768 mvm->drv_rx_stats.legacy_frames++;
2769 }
2770
2771 if (nss == 1)
2772 mvm->drv_rx_stats.siso_frames++;
2773 else if (nss == 2)
2774 mvm->drv_rx_stats.mimo2_frames++;
2775
2776 if (rate & RATE_MCS_SGI_MSK)
2777 mvm->drv_rx_stats.sgi_frames++;
2778 else
2779 mvm->drv_rx_stats.ngi_frames++;
2780
2781 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2782 mvm->drv_rx_stats.last_frame_idx =
2783 (mvm->drv_rx_stats.last_frame_idx + 1) %
2784 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2785
2786 spin_unlock(&mvm->drv_stats_lock);
2787 }
2788 #endif
2789
2790 /*
2791 * Called after adding a new station to initialize rate scaling
2792 */
2793 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2794 enum ieee80211_band band, bool init)
2795 {
2796 int i, j;
2797 struct ieee80211_hw *hw = mvm->hw;
2798 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2799 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2800 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2801 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2802 struct ieee80211_supported_band *sband;
2803 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2804
2805 /* clear all non-persistent lq data */
2806 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2807
2808 sband = hw->wiphy->bands[band];
2809
2810 lq_sta->lq.sta_id = sta_priv->sta_id;
2811
2812 for (j = 0; j < LQ_SIZE; j++)
2813 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2814
2815 lq_sta->flush_timer = 0;
2816 lq_sta->last_tx = jiffies;
2817
2818 IWL_DEBUG_RATE(mvm,
2819 "LQ: *** rate scale station global init for station %d ***\n",
2820 sta_priv->sta_id);
2821 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2822 * the lowest or the highest rate.. Could consider using RSSI from
2823 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2824 * after assoc.. */
2825
2826 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2827 lq_sta->band = sband->band;
2828 /*
2829 * active legacy rates as per supported rates bitmap
2830 */
2831 supp = sta->supp_rates[sband->band];
2832 lq_sta->active_legacy_rate = 0;
2833 for_each_set_bit(i, &supp, BITS_PER_LONG)
2834 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2835
2836 /* TODO: should probably account for rx_highest for both HT/VHT */
2837 if (!vht_cap || !vht_cap->vht_supported)
2838 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2839 else
2840 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2841
2842 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2843 lq_sta->active_mimo2_rate = 0;
2844
2845 lq_sta->max_legacy_rate_idx =
2846 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2847 lq_sta->max_siso_rate_idx =
2848 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2849 lq_sta->max_mimo2_rate_idx =
2850 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2851
2852 IWL_DEBUG_RATE(mvm,
2853 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2854 lq_sta->active_legacy_rate,
2855 lq_sta->active_siso_rate,
2856 lq_sta->active_mimo2_rate,
2857 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2858 lq_sta->bfer_capable);
2859 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2860 lq_sta->max_legacy_rate_idx,
2861 lq_sta->max_siso_rate_idx,
2862 lq_sta->max_mimo2_rate_idx);
2863
2864 /* These values will be overridden later */
2865 lq_sta->lq.single_stream_ant_msk =
2866 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2867 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2868
2869 /* as default allow aggregation for all tids */
2870 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2871 lq_sta->is_agg = 0;
2872 #ifdef CONFIG_IWLWIFI_DEBUGFS
2873 iwl_mvm_reset_frame_stats(mvm);
2874 #endif
2875 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2876 }
2877
2878 static void rs_rate_update(void *mvm_r,
2879 struct ieee80211_supported_band *sband,
2880 struct cfg80211_chan_def *chandef,
2881 struct ieee80211_sta *sta, void *priv_sta,
2882 u32 changed)
2883 {
2884 u8 tid;
2885 struct iwl_op_mode *op_mode =
2886 (struct iwl_op_mode *)mvm_r;
2887 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2888
2889 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
2890 return;
2891
2892 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2893 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2894 ieee80211_stop_tx_ba_session(sta, tid);
2895
2896 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2897 }
2898
2899 #ifdef CONFIG_MAC80211_DEBUGFS
2900 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2901 struct iwl_lq_cmd *lq_cmd,
2902 enum ieee80211_band band,
2903 u32 ucode_rate)
2904 {
2905 struct rs_rate rate;
2906 int i;
2907 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2908 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2909 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2910
2911 for (i = 0; i < num_rates; i++)
2912 lq_cmd->rs_table[i] = ucode_rate_le32;
2913
2914 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2915
2916 if (is_mimo(&rate))
2917 lq_cmd->mimo_delim = num_rates - 1;
2918 else
2919 lq_cmd->mimo_delim = 0;
2920
2921 lq_cmd->reduced_tpc = 0;
2922
2923 if (num_of_ant(ant) == 1)
2924 lq_cmd->single_stream_ant_msk = ant;
2925
2926 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2927 }
2928 #endif /* CONFIG_MAC80211_DEBUGFS */
2929
2930 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2931 struct iwl_lq_sta *lq_sta,
2932 struct rs_rate *rate,
2933 __le32 *rs_table, int *rs_table_index,
2934 int num_rates, int num_retries,
2935 u8 valid_tx_ant, bool toggle_ant)
2936 {
2937 int i, j;
2938 __le32 ucode_rate;
2939 bool bottom_reached = false;
2940 int prev_rate_idx = rate->index;
2941 int end = LINK_QUAL_MAX_RETRY_NUM;
2942 int index = *rs_table_index;
2943
2944 for (i = 0; i < num_rates && index < end; i++) {
2945 for (j = 0; j < num_retries && index < end; j++, index++) {
2946 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2947 rate));
2948 rs_table[index] = ucode_rate;
2949 if (toggle_ant)
2950 rs_toggle_antenna(valid_tx_ant, rate);
2951 }
2952
2953 prev_rate_idx = rate->index;
2954 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2955 if (bottom_reached && !is_legacy(rate))
2956 break;
2957 }
2958
2959 if (!bottom_reached && !is_legacy(rate))
2960 rate->index = prev_rate_idx;
2961
2962 *rs_table_index = index;
2963 }
2964
2965 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2966 * column the rate table should look like this:
2967 *
2968 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2969 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2970 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2971 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2972 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2973 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2974 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2975 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2976 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2977 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2978 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2979 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2980 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2981 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2982 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2983 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2984 */
2985 static void rs_build_rates_table(struct iwl_mvm *mvm,
2986 struct ieee80211_sta *sta,
2987 struct iwl_lq_sta *lq_sta,
2988 const struct rs_rate *initial_rate)
2989 {
2990 struct rs_rate rate;
2991 int num_rates, num_retries, index = 0;
2992 u8 valid_tx_ant = 0;
2993 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2994 bool toggle_ant = false;
2995
2996 memcpy(&rate, initial_rate, sizeof(rate));
2997
2998 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2999
3000 /* TODO: remove old API when min FW API hits 14 */
3001 if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3002 rs_stbc_allow(mvm, sta, lq_sta))
3003 rate.stbc = true;
3004
3005 if (is_siso(&rate)) {
3006 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3007 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3008 } else if (is_mimo(&rate)) {
3009 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3010 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3011 } else {
3012 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3013 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3014 toggle_ant = true;
3015 }
3016
3017 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3018 num_rates, num_retries, valid_tx_ant,
3019 toggle_ant);
3020
3021 rs_get_lower_rate_down_column(lq_sta, &rate);
3022
3023 if (is_siso(&rate)) {
3024 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3025 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3026 lq_cmd->mimo_delim = index;
3027 } else if (is_legacy(&rate)) {
3028 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3029 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3030 } else {
3031 WARN_ON_ONCE(1);
3032 }
3033
3034 toggle_ant = true;
3035
3036 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3037 num_rates, num_retries, valid_tx_ant,
3038 toggle_ant);
3039
3040 rs_get_lower_rate_down_column(lq_sta, &rate);
3041
3042 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3043 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3044
3045 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3046 num_rates, num_retries, valid_tx_ant,
3047 toggle_ant);
3048
3049 }
3050
3051 struct rs_bfer_active_iter_data {
3052 struct ieee80211_sta *exclude_sta;
3053 struct iwl_mvm_sta *bfer_mvmsta;
3054 };
3055
3056 static void rs_bfer_active_iter(void *_data,
3057 struct ieee80211_sta *sta)
3058 {
3059 struct rs_bfer_active_iter_data *data = _data;
3060 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3061 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3062 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3063
3064 if (sta == data->exclude_sta)
3065 return;
3066
3067 /* The current sta has BFER allowed */
3068 if (ss_params & LQ_SS_BFER_ALLOWED) {
3069 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3070
3071 data->bfer_mvmsta = mvmsta;
3072 }
3073 }
3074
3075 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3076 {
3077 int prio = -1;
3078 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3079
3080 switch (viftype) {
3081 case NL80211_IFTYPE_AP:
3082 case NL80211_IFTYPE_P2P_GO:
3083 prio = 3;
3084 break;
3085 case NL80211_IFTYPE_P2P_CLIENT:
3086 prio = 2;
3087 break;
3088 case NL80211_IFTYPE_STATION:
3089 prio = 1;
3090 break;
3091 default:
3092 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3093 prio = -1;
3094 }
3095
3096 return prio;
3097 }
3098
3099 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3100 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3101 struct iwl_mvm_sta *sta2)
3102 {
3103 int prio1 = rs_bfer_priority(sta1);
3104 int prio2 = rs_bfer_priority(sta2);
3105
3106 if (prio1 > prio2)
3107 return 1;
3108 if (prio1 < prio2)
3109 return -1;
3110 return 0;
3111 }
3112
3113 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3114 struct ieee80211_sta *sta,
3115 struct iwl_lq_sta *lq_sta,
3116 const struct rs_rate *initial_rate)
3117 {
3118 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3119 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3120 struct rs_bfer_active_iter_data data = {
3121 .exclude_sta = sta,
3122 .bfer_mvmsta = NULL,
3123 };
3124 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3125 u32 ss_params = LQ_SS_PARAMS_VALID;
3126
3127 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3128 goto out;
3129
3130 #ifdef CONFIG_MAC80211_DEBUGFS
3131 /* Check if forcing the decision is configured.
3132 * Note that SISO is forced by not allowing STBC or BFER
3133 */
3134 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3135 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3136 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3137 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3138
3139 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3140 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3141 lq_sta->pers.ss_force);
3142 goto out;
3143 }
3144 #endif
3145
3146 if (lq_sta->stbc_capable)
3147 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3148
3149 if (!lq_sta->bfer_capable)
3150 goto out;
3151
3152 ieee80211_iterate_stations_atomic(mvm->hw,
3153 rs_bfer_active_iter,
3154 &data);
3155 bfer_mvmsta = data.bfer_mvmsta;
3156
3157 /* This code is safe as it doesn't run concurrently for different
3158 * stations. This is guaranteed by the fact that calls to
3159 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3160 */
3161 if (!bfer_mvmsta) {
3162 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3163
3164 ss_params |= LQ_SS_BFER_ALLOWED;
3165 goto out;
3166 }
3167
3168 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3169 bfer_mvmsta->sta_id);
3170
3171 /* Disallow BFER on another STA if active and we're a higher priority */
3172 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3173 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3174 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3175
3176 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3177 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3178 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3179
3180 ss_params |= LQ_SS_BFER_ALLOWED;
3181 IWL_DEBUG_RATE(mvm,
3182 "Lower priority BFER sta found (%d). Switch BFER\n",
3183 bfer_mvmsta->sta_id);
3184 }
3185 out:
3186 lq_cmd->ss_params = cpu_to_le32(ss_params);
3187 }
3188
3189 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3190 struct ieee80211_sta *sta,
3191 struct iwl_lq_sta *lq_sta,
3192 const struct rs_rate *initial_rate)
3193 {
3194 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3195 struct iwl_mvm_sta *mvmsta;
3196 struct iwl_mvm_vif *mvmvif;
3197
3198 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3199 lq_cmd->agg_time_limit =
3200 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3201
3202 #ifdef CONFIG_MAC80211_DEBUGFS
3203 if (lq_sta->pers.dbg_fixed_rate) {
3204 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3205 lq_sta->band,
3206 lq_sta->pers.dbg_fixed_rate);
3207 return;
3208 }
3209 #endif
3210 if (WARN_ON_ONCE(!sta || !initial_rate))
3211 return;
3212
3213 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3214
3215 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3216 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3217
3218 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3219 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3220
3221 if (num_of_ant(initial_rate->ant) == 1)
3222 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3223
3224 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3225
3226 /*
3227 * In case of low latency, tell the firmware to leave a frame in the
3228 * Tx Fifo so that it can start a transaction in the same TxOP. This
3229 * basically allows the firmware to send bursts.
3230 */
3231 if (iwl_mvm_vif_low_latency(mvmvif)) {
3232 lq_cmd->agg_frame_cnt_limit--;
3233
3234 if (mvm->low_latency_agg_frame_limit)
3235 lq_cmd->agg_frame_cnt_limit =
3236 min(lq_cmd->agg_frame_cnt_limit,
3237 mvm->low_latency_agg_frame_limit);
3238 }
3239
3240 if (mvmsta->vif->p2p)
3241 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3242
3243 lq_cmd->agg_time_limit =
3244 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3245 }
3246
3247 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3248 {
3249 return hw->priv;
3250 }
3251 /* rate scale requires free function to be implemented */
3252 static void rs_free(void *mvm_rate)
3253 {
3254 return;
3255 }
3256
3257 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3258 void *mvm_sta)
3259 {
3260 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3261 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3262
3263 IWL_DEBUG_RATE(mvm, "enter\n");
3264 IWL_DEBUG_RATE(mvm, "leave\n");
3265 }
3266
3267 #ifdef CONFIG_MAC80211_DEBUGFS
3268 int rs_pretty_print_rate(char *buf, const u32 rate)
3269 {
3270
3271 char *type, *bw;
3272 u8 mcs = 0, nss = 0;
3273 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3274
3275 if (!(rate & RATE_MCS_HT_MSK) &&
3276 !(rate & RATE_MCS_VHT_MSK)) {
3277 int index = iwl_hwrate_to_plcp_idx(rate);
3278
3279 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3280 rs_pretty_ant(ant),
3281 index == IWL_RATE_INVALID ? "BAD" :
3282 iwl_rate_mcs[index].mbps);
3283 }
3284
3285 if (rate & RATE_MCS_VHT_MSK) {
3286 type = "VHT";
3287 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3288 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3289 >> RATE_VHT_MCS_NSS_POS) + 1;
3290 } else if (rate & RATE_MCS_HT_MSK) {
3291 type = "HT";
3292 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3293 } else {
3294 type = "Unknown"; /* shouldn't happen */
3295 }
3296
3297 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3298 case RATE_MCS_CHAN_WIDTH_20:
3299 bw = "20Mhz";
3300 break;
3301 case RATE_MCS_CHAN_WIDTH_40:
3302 bw = "40Mhz";
3303 break;
3304 case RATE_MCS_CHAN_WIDTH_80:
3305 bw = "80Mhz";
3306 break;
3307 case RATE_MCS_CHAN_WIDTH_160:
3308 bw = "160Mhz";
3309 break;
3310 default:
3311 bw = "BAD BW";
3312 }
3313
3314 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3315 type, rs_pretty_ant(ant), bw, mcs, nss,
3316 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3317 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3318 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3319 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3320 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3321 }
3322
3323 /**
3324 * Program the device to use fixed rate for frame transmit
3325 * This is for debugging/testing only
3326 * once the device start use fixed rate, we need to reload the module
3327 * to being back the normal operation.
3328 */
3329 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3330 struct iwl_lq_sta *lq_sta)
3331 {
3332 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3333 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3334 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3335
3336 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3337 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3338
3339 if (lq_sta->pers.dbg_fixed_rate) {
3340 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3341 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3342 }
3343 }
3344
3345 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3346 const char __user *user_buf, size_t count, loff_t *ppos)
3347 {
3348 struct iwl_lq_sta *lq_sta = file->private_data;
3349 struct iwl_mvm *mvm;
3350 char buf[64];
3351 size_t buf_size;
3352 u32 parsed_rate;
3353
3354 mvm = lq_sta->pers.drv;
3355 memset(buf, 0, sizeof(buf));
3356 buf_size = min(count, sizeof(buf) - 1);
3357 if (copy_from_user(buf, user_buf, buf_size))
3358 return -EFAULT;
3359
3360 if (sscanf(buf, "%x", &parsed_rate) == 1)
3361 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3362 else
3363 lq_sta->pers.dbg_fixed_rate = 0;
3364
3365 rs_program_fix_rate(mvm, lq_sta);
3366
3367 return count;
3368 }
3369
3370 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3371 char __user *user_buf, size_t count, loff_t *ppos)
3372 {
3373 char *buff;
3374 int desc = 0;
3375 int i = 0;
3376 ssize_t ret;
3377
3378 struct iwl_lq_sta *lq_sta = file->private_data;
3379 struct iwl_mvm *mvm;
3380 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3381 struct rs_rate *rate = &tbl->rate;
3382 u32 ss_params;
3383 mvm = lq_sta->pers.drv;
3384 buff = kmalloc(2048, GFP_KERNEL);
3385 if (!buff)
3386 return -ENOMEM;
3387
3388 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3389 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3390 lq_sta->total_failed, lq_sta->total_success,
3391 lq_sta->active_legacy_rate);
3392 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3393 lq_sta->pers.dbg_fixed_rate);
3394 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3395 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3396 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3397 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3398 desc += sprintf(buff+desc, "lq type %s\n",
3399 (is_legacy(rate)) ? "legacy" :
3400 is_vht(rate) ? "VHT" : "HT");
3401 if (!is_legacy(rate)) {
3402 desc += sprintf(buff + desc, " %s",
3403 (is_siso(rate)) ? "SISO" : "MIMO2");
3404 desc += sprintf(buff + desc, " %s",
3405 (is_ht20(rate)) ? "20MHz" :
3406 (is_ht40(rate)) ? "40MHz" :
3407 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3408 desc += sprintf(buff + desc, " %s %s %s\n",
3409 (rate->sgi) ? "SGI" : "NGI",
3410 (rate->ldpc) ? "LDPC" : "BCC",
3411 (lq_sta->is_agg) ? "AGG on" : "");
3412 }
3413 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3414 lq_sta->last_rate_n_flags);
3415 desc += sprintf(buff+desc,
3416 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3417 lq_sta->lq.flags,
3418 lq_sta->lq.mimo_delim,
3419 lq_sta->lq.single_stream_ant_msk,
3420 lq_sta->lq.dual_stream_ant_msk);
3421
3422 desc += sprintf(buff+desc,
3423 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3424 le16_to_cpu(lq_sta->lq.agg_time_limit),
3425 lq_sta->lq.agg_disable_start_th,
3426 lq_sta->lq.agg_frame_cnt_limit);
3427
3428 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3429 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3430 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3431 (ss_params & LQ_SS_PARAMS_VALID) ?
3432 "VALID" : "INVALID",
3433 (ss_params & LQ_SS_BFER_ALLOWED) ?
3434 ", BFER" : "",
3435 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3436 ", STBC" : "",
3437 (ss_params & LQ_SS_FORCE) ?
3438 ", FORCE" : "");
3439 desc += sprintf(buff+desc,
3440 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3441 lq_sta->lq.initial_rate_index[0],
3442 lq_sta->lq.initial_rate_index[1],
3443 lq_sta->lq.initial_rate_index[2],
3444 lq_sta->lq.initial_rate_index[3]);
3445
3446 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3447 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3448
3449 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3450 desc += rs_pretty_print_rate(buff+desc, r);
3451 }
3452
3453 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3454 kfree(buff);
3455 return ret;
3456 }
3457
3458 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3459 .write = rs_sta_dbgfs_scale_table_write,
3460 .read = rs_sta_dbgfs_scale_table_read,
3461 .open = simple_open,
3462 .llseek = default_llseek,
3463 };
3464 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3465 char __user *user_buf, size_t count, loff_t *ppos)
3466 {
3467 char *buff;
3468 int desc = 0;
3469 int i, j;
3470 ssize_t ret;
3471 struct iwl_scale_tbl_info *tbl;
3472 struct rs_rate *rate;
3473 struct iwl_lq_sta *lq_sta = file->private_data;
3474
3475 buff = kmalloc(1024, GFP_KERNEL);
3476 if (!buff)
3477 return -ENOMEM;
3478
3479 for (i = 0; i < LQ_SIZE; i++) {
3480 tbl = &(lq_sta->lq_info[i]);
3481 rate = &tbl->rate;
3482 desc += sprintf(buff+desc,
3483 "%s type=%d SGI=%d BW=%s DUP=0\n"
3484 "index=%d\n",
3485 lq_sta->active_tbl == i ? "*" : "x",
3486 rate->type,
3487 rate->sgi,
3488 is_ht20(rate) ? "20Mhz" :
3489 is_ht40(rate) ? "40Mhz" :
3490 is_ht80(rate) ? "80Mhz" : "ERR",
3491 rate->index);
3492 for (j = 0; j < IWL_RATE_COUNT; j++) {
3493 desc += sprintf(buff+desc,
3494 "counter=%d success=%d %%=%d\n",
3495 tbl->win[j].counter,
3496 tbl->win[j].success_counter,
3497 tbl->win[j].success_ratio);
3498 }
3499 }
3500 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3501 kfree(buff);
3502 return ret;
3503 }
3504
3505 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3506 .read = rs_sta_dbgfs_stats_table_read,
3507 .open = simple_open,
3508 .llseek = default_llseek,
3509 };
3510
3511 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3512 char __user *user_buf,
3513 size_t count, loff_t *ppos)
3514 {
3515 static const char * const column_name[] = {
3516 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3517 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3518 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3519 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3520 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3521 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3522 [RS_COLUMN_MIMO2] = "MIMO2",
3523 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3524 };
3525
3526 static const char * const rate_name[] = {
3527 [IWL_RATE_1M_INDEX] = "1M",
3528 [IWL_RATE_2M_INDEX] = "2M",
3529 [IWL_RATE_5M_INDEX] = "5.5M",
3530 [IWL_RATE_11M_INDEX] = "11M",
3531 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3532 [IWL_RATE_9M_INDEX] = "9M",
3533 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3534 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3535 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3536 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3537 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3538 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3539 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3540 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3541 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3542 };
3543
3544 char *buff, *pos, *endpos;
3545 int col, rate;
3546 ssize_t ret;
3547 struct iwl_lq_sta *lq_sta = file->private_data;
3548 struct rs_rate_stats *stats;
3549 static const size_t bufsz = 1024;
3550
3551 buff = kmalloc(bufsz, GFP_KERNEL);
3552 if (!buff)
3553 return -ENOMEM;
3554
3555 pos = buff;
3556 endpos = pos + bufsz;
3557
3558 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3559 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3560 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3561 pos += scnprintf(pos, endpos - pos, "\n");
3562
3563 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3564 pos += scnprintf(pos, endpos - pos,
3565 "%s,", column_name[col]);
3566
3567 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3568 stats = &(lq_sta->pers.tx_stats[col][rate]);
3569 pos += scnprintf(pos, endpos - pos,
3570 "%llu/%llu,",
3571 stats->success,
3572 stats->total);
3573 }
3574 pos += scnprintf(pos, endpos - pos, "\n");
3575 }
3576
3577 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3578 kfree(buff);
3579 return ret;
3580 }
3581
3582 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3583 const char __user *user_buf,
3584 size_t count, loff_t *ppos)
3585 {
3586 struct iwl_lq_sta *lq_sta = file->private_data;
3587 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3588
3589 return count;
3590 }
3591
3592 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3593 .read = rs_sta_dbgfs_drv_tx_stats_read,
3594 .write = rs_sta_dbgfs_drv_tx_stats_write,
3595 .open = simple_open,
3596 .llseek = default_llseek,
3597 };
3598
3599 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3600 char __user *user_buf,
3601 size_t count, loff_t *ppos)
3602 {
3603 struct iwl_lq_sta *lq_sta = file->private_data;
3604 char buf[12];
3605 int bufsz = sizeof(buf);
3606 int pos = 0;
3607 static const char * const ss_force_name[] = {
3608 [RS_SS_FORCE_NONE] = "none",
3609 [RS_SS_FORCE_STBC] = "stbc",
3610 [RS_SS_FORCE_BFER] = "bfer",
3611 [RS_SS_FORCE_SISO] = "siso",
3612 };
3613
3614 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3615 ss_force_name[lq_sta->pers.ss_force]);
3616 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3617 }
3618
3619 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3620 size_t count, loff_t *ppos)
3621 {
3622 struct iwl_mvm *mvm = lq_sta->pers.drv;
3623 int ret = 0;
3624
3625 if (!strncmp("none", buf, 4)) {
3626 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3627 } else if (!strncmp("siso", buf, 4)) {
3628 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3629 } else if (!strncmp("stbc", buf, 4)) {
3630 if (lq_sta->stbc_capable) {
3631 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3632 } else {
3633 IWL_ERR(mvm,
3634 "can't force STBC. peer doesn't support\n");
3635 ret = -EINVAL;
3636 }
3637 } else if (!strncmp("bfer", buf, 4)) {
3638 if (lq_sta->bfer_capable) {
3639 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3640 } else {
3641 IWL_ERR(mvm,
3642 "can't force BFER. peer doesn't support\n");
3643 ret = -EINVAL;
3644 }
3645 } else {
3646 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3647 ret = -EINVAL;
3648 }
3649 return ret ?: count;
3650 }
3651
3652 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3653 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3654 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3655 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3656 &iwl_dbgfs_##name##_ops)) \
3657 goto err; \
3658 } while (0)
3659
3660 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3661
3662 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3663 {
3664 struct iwl_lq_sta *lq_sta = priv_sta;
3665 struct iwl_mvm_sta *mvmsta;
3666
3667 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3668
3669 if (!mvmsta->vif)
3670 return;
3671
3672 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3673 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3674 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3675 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3676 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3677 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3678 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3679 &lq_sta->tx_agg_tid_en);
3680 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3681 &lq_sta->pers.dbg_fixed_txp_reduction);
3682
3683 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3684 return;
3685 err:
3686 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3687 }
3688
3689 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3690 {
3691 }
3692 #endif
3693
3694 /*
3695 * Initialization of rate scaling information is done by driver after
3696 * the station is added. Since mac80211 calls this function before a
3697 * station is added we ignore it.
3698 */
3699 static void rs_rate_init_stub(void *mvm_r,
3700 struct ieee80211_supported_band *sband,
3701 struct cfg80211_chan_def *chandef,
3702 struct ieee80211_sta *sta, void *mvm_sta)
3703 {
3704 }
3705
3706 static const struct rate_control_ops rs_mvm_ops = {
3707 .name = RS_NAME,
3708 .tx_status = rs_mac80211_tx_status,
3709 .get_rate = rs_get_rate,
3710 .rate_init = rs_rate_init_stub,
3711 .alloc = rs_alloc,
3712 .free = rs_free,
3713 .alloc_sta = rs_alloc_sta,
3714 .free_sta = rs_free_sta,
3715 .rate_update = rs_rate_update,
3716 #ifdef CONFIG_MAC80211_DEBUGFS
3717 .add_sta_debugfs = rs_add_debugfs,
3718 .remove_sta_debugfs = rs_remove_debugfs,
3719 #endif
3720 };
3721
3722 int iwl_mvm_rate_control_register(void)
3723 {
3724 return ieee80211_rate_control_register(&rs_mvm_ops);
3725 }
3726
3727 void iwl_mvm_rate_control_unregister(void)
3728 {
3729 ieee80211_rate_control_unregister(&rs_mvm_ops);
3730 }
3731
3732 /**
3733 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3734 * Tx protection, according to this request and previous requests,
3735 * and send the LQ command.
3736 * @mvmsta: The station
3737 * @enable: Enable Tx protection?
3738 */
3739 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3740 bool enable)
3741 {
3742 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3743
3744 lockdep_assert_held(&mvm->mutex);
3745
3746 if (enable) {
3747 if (mvmsta->tx_protection == 0)
3748 lq->flags |= LQ_FLAG_USE_RTS_MSK;
3749 mvmsta->tx_protection++;
3750 } else {
3751 mvmsta->tx_protection--;
3752 if (mvmsta->tx_protection == 0)
3753 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3754 }
3755
3756 return iwl_mvm_send_lq_cmd(mvm, lq, false);
3757 }
Linux kernel - Deliverables
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