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iwlwifi: mvm: rs: disable MIMO for low latency P2P
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / mvm / rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 *
19 * The full GNU General Public License is included in this distribution in the
20 * file called LICENSE.
21 *
22 * Contact Information:
23 * Intel Linux Wireless <ilw@linux.intel.com>
24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *
26 *****************************************************************************/
27 #include <linux/kernel.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37 #include "rs.h"
38 #include "fw-api.h"
39 #include "sta.h"
40 #include "iwl-op-mode.h"
41 #include "mvm.h"
42 #include "debugfs.h"
43
44 #define RS_NAME "iwl-mvm-rs"
45
46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
47
48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
49 * Use this macro when dealing with thresholds consts set as a percentage
50 */
51 #define RS_PERCENT(x) (128 * x)
52
53 static u8 rs_ht_to_legacy[] = {
54 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
55 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
56 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
57 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
58 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
59 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
60 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
61 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
64 };
65
66 static const u8 ant_toggle_lookup[] = {
67 [ANT_NONE] = ANT_NONE,
68 [ANT_A] = ANT_B,
69 [ANT_B] = ANT_C,
70 [ANT_AB] = ANT_BC,
71 [ANT_C] = ANT_A,
72 [ANT_AC] = ANT_AB,
73 [ANT_BC] = ANT_AC,
74 [ANT_ABC] = ANT_ABC,
75 };
76
77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
83 IWL_RATE_##rp##M_INDEX, \
84 IWL_RATE_##rn##M_INDEX }
85
86 #define IWL_DECLARE_MCS_RATE(s) \
87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_INVM_INDEX, \
93 IWL_RATE_INVM_INDEX }
94
95 /*
96 * Parameter order:
97 * rate, ht rate, prev rate, next rate
98 *
99 * If there isn't a valid next or previous rate then INV is used which
100 * maps to IWL_RATE_INVALID
101 *
102 */
103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
104 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
105 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
106 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
107 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
109 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
119 };
120
121 enum rs_action {
122 RS_ACTION_STAY = 0,
123 RS_ACTION_DOWNSCALE = -1,
124 RS_ACTION_UPSCALE = 1,
125 };
126
127 enum rs_column_mode {
128 RS_INVALID = 0,
129 RS_LEGACY,
130 RS_SISO,
131 RS_MIMO2,
132 };
133
134 #define MAX_NEXT_COLUMNS 7
135 #define MAX_COLUMN_CHECKS 3
136
137 struct rs_tx_column;
138
139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
140 struct ieee80211_sta *sta,
141 struct iwl_scale_tbl_info *tbl,
142 const struct rs_tx_column *next_col);
143
144 struct rs_tx_column {
145 enum rs_column_mode mode;
146 u8 ant;
147 bool sgi;
148 enum rs_column next_columns[MAX_NEXT_COLUMNS];
149 allow_column_func_t checks[MAX_COLUMN_CHECKS];
150 };
151
152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
153 struct iwl_scale_tbl_info *tbl,
154 const struct rs_tx_column *next_col)
155 {
156 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
157 }
158
159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
160 struct iwl_scale_tbl_info *tbl,
161 const struct rs_tx_column *next_col)
162 {
163 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 return true;
184 }
185
186 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
187 struct iwl_scale_tbl_info *tbl,
188 const struct rs_tx_column *next_col)
189 {
190 if (!sta->ht_cap.ht_supported)
191 return false;
192
193 return true;
194 }
195
196 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
197 struct iwl_scale_tbl_info *tbl,
198 const struct rs_tx_column *next_col)
199 {
200 struct rs_rate *rate = &tbl->rate;
201 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
202 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
203
204 if (is_ht20(rate) && (ht_cap->cap &
205 IEEE80211_HT_CAP_SGI_20))
206 return true;
207 if (is_ht40(rate) && (ht_cap->cap &
208 IEEE80211_HT_CAP_SGI_40))
209 return true;
210 if (is_ht80(rate) && (vht_cap->cap &
211 IEEE80211_VHT_CAP_SHORT_GI_80))
212 return true;
213
214 return false;
215 }
216
217 static const struct rs_tx_column rs_tx_columns[] = {
218 [RS_COLUMN_LEGACY_ANT_A] = {
219 .mode = RS_LEGACY,
220 .ant = ANT_A,
221 .next_columns = {
222 RS_COLUMN_LEGACY_ANT_B,
223 RS_COLUMN_SISO_ANT_A,
224 RS_COLUMN_MIMO2,
225 RS_COLUMN_INVALID,
226 RS_COLUMN_INVALID,
227 RS_COLUMN_INVALID,
228 RS_COLUMN_INVALID,
229 },
230 .checks = {
231 rs_ant_allow,
232 },
233 },
234 [RS_COLUMN_LEGACY_ANT_B] = {
235 .mode = RS_LEGACY,
236 .ant = ANT_B,
237 .next_columns = {
238 RS_COLUMN_LEGACY_ANT_A,
239 RS_COLUMN_SISO_ANT_B,
240 RS_COLUMN_MIMO2,
241 RS_COLUMN_INVALID,
242 RS_COLUMN_INVALID,
243 RS_COLUMN_INVALID,
244 RS_COLUMN_INVALID,
245 },
246 .checks = {
247 rs_ant_allow,
248 },
249 },
250 [RS_COLUMN_SISO_ANT_A] = {
251 .mode = RS_SISO,
252 .ant = ANT_A,
253 .next_columns = {
254 RS_COLUMN_SISO_ANT_B,
255 RS_COLUMN_MIMO2,
256 RS_COLUMN_SISO_ANT_A_SGI,
257 RS_COLUMN_LEGACY_ANT_A,
258 RS_COLUMN_LEGACY_ANT_B,
259 RS_COLUMN_INVALID,
260 RS_COLUMN_INVALID,
261 },
262 .checks = {
263 rs_siso_allow,
264 rs_ant_allow,
265 },
266 },
267 [RS_COLUMN_SISO_ANT_B] = {
268 .mode = RS_SISO,
269 .ant = ANT_B,
270 .next_columns = {
271 RS_COLUMN_SISO_ANT_A,
272 RS_COLUMN_MIMO2,
273 RS_COLUMN_SISO_ANT_B_SGI,
274 RS_COLUMN_LEGACY_ANT_A,
275 RS_COLUMN_LEGACY_ANT_B,
276 RS_COLUMN_INVALID,
277 RS_COLUMN_INVALID,
278 },
279 .checks = {
280 rs_siso_allow,
281 rs_ant_allow,
282 },
283 },
284 [RS_COLUMN_SISO_ANT_A_SGI] = {
285 .mode = RS_SISO,
286 .ant = ANT_A,
287 .sgi = true,
288 .next_columns = {
289 RS_COLUMN_SISO_ANT_B_SGI,
290 RS_COLUMN_MIMO2_SGI,
291 RS_COLUMN_SISO_ANT_A,
292 RS_COLUMN_LEGACY_ANT_A,
293 RS_COLUMN_LEGACY_ANT_B,
294 RS_COLUMN_INVALID,
295 RS_COLUMN_INVALID,
296 },
297 .checks = {
298 rs_siso_allow,
299 rs_ant_allow,
300 rs_sgi_allow,
301 },
302 },
303 [RS_COLUMN_SISO_ANT_B_SGI] = {
304 .mode = RS_SISO,
305 .ant = ANT_B,
306 .sgi = true,
307 .next_columns = {
308 RS_COLUMN_SISO_ANT_A_SGI,
309 RS_COLUMN_MIMO2_SGI,
310 RS_COLUMN_SISO_ANT_B,
311 RS_COLUMN_LEGACY_ANT_A,
312 RS_COLUMN_LEGACY_ANT_B,
313 RS_COLUMN_INVALID,
314 RS_COLUMN_INVALID,
315 },
316 .checks = {
317 rs_siso_allow,
318 rs_ant_allow,
319 rs_sgi_allow,
320 },
321 },
322 [RS_COLUMN_MIMO2] = {
323 .mode = RS_MIMO2,
324 .ant = ANT_AB,
325 .next_columns = {
326 RS_COLUMN_SISO_ANT_A,
327 RS_COLUMN_MIMO2_SGI,
328 RS_COLUMN_LEGACY_ANT_A,
329 RS_COLUMN_LEGACY_ANT_B,
330 RS_COLUMN_INVALID,
331 RS_COLUMN_INVALID,
332 RS_COLUMN_INVALID,
333 },
334 .checks = {
335 rs_mimo_allow,
336 },
337 },
338 [RS_COLUMN_MIMO2_SGI] = {
339 .mode = RS_MIMO2,
340 .ant = ANT_AB,
341 .sgi = true,
342 .next_columns = {
343 RS_COLUMN_SISO_ANT_A_SGI,
344 RS_COLUMN_MIMO2,
345 RS_COLUMN_LEGACY_ANT_A,
346 RS_COLUMN_LEGACY_ANT_B,
347 RS_COLUMN_INVALID,
348 RS_COLUMN_INVALID,
349 RS_COLUMN_INVALID,
350 },
351 .checks = {
352 rs_mimo_allow,
353 rs_sgi_allow,
354 },
355 },
356 };
357
358 static inline u8 rs_extract_rate(u32 rate_n_flags)
359 {
360 /* also works for HT because bits 7:6 are zero there */
361 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
362 }
363
364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
365 {
366 int idx = 0;
367
368 if (rate_n_flags & RATE_MCS_HT_MSK) {
369 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
370 idx += IWL_RATE_MCS_0_INDEX;
371
372 /* skip 9M not supported in HT*/
373 if (idx >= IWL_RATE_9M_INDEX)
374 idx += 1;
375 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
376 return idx;
377 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
378 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
379 idx += IWL_RATE_MCS_0_INDEX;
380
381 /* skip 9M not supported in VHT*/
382 if (idx >= IWL_RATE_9M_INDEX)
383 idx++;
384 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
385 return idx;
386 } else {
387 /* legacy rate format, search for match in table */
388
389 u8 legacy_rate = rs_extract_rate(rate_n_flags);
390 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
391 if (iwl_rates[idx].plcp == legacy_rate)
392 return idx;
393 }
394
395 return IWL_RATE_INVALID;
396 }
397
398 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
399 struct ieee80211_sta *sta,
400 struct iwl_lq_sta *lq_sta,
401 int tid);
402 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
403 struct ieee80211_sta *sta,
404 struct iwl_lq_sta *lq_sta,
405 const struct rs_rate *initial_rate);
406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
407
408 /**
409 * The following tables contain the expected throughput metrics for all rates
410 *
411 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
412 *
413 * where invalid entries are zeros.
414 *
415 * CCK rates are only valid in legacy table and will only be used in G
416 * (2.4 GHz) band.
417 */
418
419 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
420 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
421 };
422
423 /* Expected TpT tables. 4 indexes:
424 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
425 */
426 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
427 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
428 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
429 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
430 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
431 };
432
433 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
434 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
435 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
436 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
437 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
438 };
439
440 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
441 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
442 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
443 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
444 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
445 };
446
447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
448 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
449 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
450 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
451 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
452 };
453
454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
455 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
456 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
457 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
458 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
459 };
460
461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
462 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
463 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
464 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
465 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
466 };
467
468 /* mbps, mcs */
469 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
470 { "1", "BPSK DSSS"},
471 { "2", "QPSK DSSS"},
472 {"5.5", "BPSK CCK"},
473 { "11", "QPSK CCK"},
474 { "6", "BPSK 1/2"},
475 { "9", "BPSK 1/2"},
476 { "12", "QPSK 1/2"},
477 { "18", "QPSK 3/4"},
478 { "24", "16QAM 1/2"},
479 { "36", "16QAM 3/4"},
480 { "48", "64QAM 2/3"},
481 { "54", "64QAM 3/4"},
482 { "60", "64QAM 5/6"},
483 };
484
485 #define MCS_INDEX_PER_STREAM (8)
486
487 static const char *rs_pretty_ant(u8 ant)
488 {
489 static const char * const ant_name[] = {
490 [ANT_NONE] = "None",
491 [ANT_A] = "A",
492 [ANT_B] = "B",
493 [ANT_AB] = "AB",
494 [ANT_C] = "C",
495 [ANT_AC] = "AC",
496 [ANT_BC] = "BC",
497 [ANT_ABC] = "ABC",
498 };
499
500 if (ant > ANT_ABC)
501 return "UNKNOWN";
502
503 return ant_name[ant];
504 }
505
506 static const char *rs_pretty_lq_type(enum iwl_table_type type)
507 {
508 static const char * const lq_types[] = {
509 [LQ_NONE] = "NONE",
510 [LQ_LEGACY_A] = "LEGACY_A",
511 [LQ_LEGACY_G] = "LEGACY_G",
512 [LQ_HT_SISO] = "HT SISO",
513 [LQ_HT_MIMO2] = "HT MIMO",
514 [LQ_VHT_SISO] = "VHT SISO",
515 [LQ_VHT_MIMO2] = "VHT MIMO",
516 };
517
518 if (type < LQ_NONE || type >= LQ_MAX)
519 return "UNKNOWN";
520
521 return lq_types[type];
522 }
523
524 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
525 const char *prefix)
526 {
527 IWL_DEBUG_RATE(mvm,
528 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
529 prefix, rs_pretty_lq_type(rate->type),
530 rate->index, rs_pretty_ant(rate->ant),
531 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
532 }
533
534 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
535 {
536 window->data = 0;
537 window->success_counter = 0;
538 window->success_ratio = IWL_INVALID_VALUE;
539 window->counter = 0;
540 window->average_tpt = IWL_INVALID_VALUE;
541 }
542
543 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
544 struct iwl_scale_tbl_info *tbl)
545 {
546 int i;
547
548 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
549 for (i = 0; i < IWL_RATE_COUNT; i++)
550 rs_rate_scale_clear_window(&tbl->win[i]);
551
552 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
553 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
554 }
555
556 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
557 {
558 return (ant_type & valid_antenna) == ant_type;
559 }
560
561 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
562 struct iwl_lq_sta *lq_data, u8 tid,
563 struct ieee80211_sta *sta)
564 {
565 int ret = -EAGAIN;
566
567 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
568 sta->addr, tid);
569 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
570 if (ret == -EAGAIN) {
571 /*
572 * driver and mac80211 is out of sync
573 * this might be cause by reloading firmware
574 * stop the tx ba session here
575 */
576 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
577 tid);
578 ieee80211_stop_tx_ba_session(sta, tid);
579 }
580 return ret;
581 }
582
583 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
584 struct iwl_lq_sta *lq_data,
585 struct ieee80211_sta *sta)
586 {
587 if (tid < IWL_MAX_TID_COUNT)
588 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
589 else
590 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
591 tid, IWL_MAX_TID_COUNT);
592 }
593
594 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
595 {
596 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
597 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
598 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
599 }
600
601 /*
602 * Static function to get the expected throughput from an iwl_scale_tbl_info
603 * that wraps a NULL pointer check
604 */
605 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
606 {
607 if (tbl->expected_tpt)
608 return tbl->expected_tpt[rs_index];
609 return 0;
610 }
611
612 /**
613 * rs_collect_tx_data - Update the success/failure sliding window
614 *
615 * We keep a sliding window of the last 62 packets transmitted
616 * at this rate. window->data contains the bitmask of successful
617 * packets.
618 */
619 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
620 struct iwl_scale_tbl_info *tbl,
621 int scale_index, int attempts, int successes,
622 struct iwl_rate_scale_data *window)
623 {
624 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
625 s32 fail_count, tpt;
626
627 /* Get expected throughput */
628 tpt = get_expected_tpt(tbl, scale_index);
629
630 /*
631 * Keep track of only the latest 62 tx frame attempts in this rate's
632 * history window; anything older isn't really relevant any more.
633 * If we have filled up the sliding window, drop the oldest attempt;
634 * if the oldest attempt (highest bit in bitmap) shows "success",
635 * subtract "1" from the success counter (this is the main reason
636 * we keep these bitmaps!).
637 */
638 while (attempts > 0) {
639 if (window->counter >= IWL_RATE_MAX_WINDOW) {
640 /* remove earliest */
641 window->counter = IWL_RATE_MAX_WINDOW - 1;
642
643 if (window->data & mask) {
644 window->data &= ~mask;
645 window->success_counter--;
646 }
647 }
648
649 /* Increment frames-attempted counter */
650 window->counter++;
651
652 /* Shift bitmap by one frame to throw away oldest history */
653 window->data <<= 1;
654
655 /* Mark the most recent #successes attempts as successful */
656 if (successes > 0) {
657 window->success_counter++;
658 window->data |= 0x1;
659 successes--;
660 }
661
662 attempts--;
663 }
664
665 /* Calculate current success ratio, avoid divide-by-0! */
666 if (window->counter > 0)
667 window->success_ratio = 128 * (100 * window->success_counter)
668 / window->counter;
669 else
670 window->success_ratio = IWL_INVALID_VALUE;
671
672 fail_count = window->counter - window->success_counter;
673
674 /* Calculate average throughput, if we have enough history. */
675 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
676 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
677 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
678 else
679 window->average_tpt = IWL_INVALID_VALUE;
680
681 return 0;
682 }
683
684 static int rs_collect_tx_data(struct iwl_mvm *mvm,
685 struct iwl_lq_sta *lq_sta,
686 struct iwl_scale_tbl_info *tbl,
687 int scale_index, int attempts, int successes,
688 u8 reduced_txp)
689 {
690 struct iwl_rate_scale_data *window = NULL;
691 int ret;
692
693 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
694 return -EINVAL;
695
696 if (tbl->column != RS_COLUMN_INVALID) {
697 struct lq_sta_pers *pers = &lq_sta->pers;
698
699 pers->tx_stats[tbl->column][scale_index].total += attempts;
700 pers->tx_stats[tbl->column][scale_index].success += successes;
701 }
702
703 /* Select window for current tx bit rate */
704 window = &(tbl->win[scale_index]);
705
706 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
707 window);
708 if (ret)
709 return ret;
710
711 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
712 return -EINVAL;
713
714 window = &tbl->tpc_win[reduced_txp];
715 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
716 window);
717 }
718
719 /* Convert rs_rate object into ucode rate bitmask */
720 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
721 struct rs_rate *rate)
722 {
723 u32 ucode_rate = 0;
724 int index = rate->index;
725
726 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
727 RATE_MCS_ANT_ABC_MSK);
728
729 if (is_legacy(rate)) {
730 ucode_rate |= iwl_rates[index].plcp;
731 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
732 ucode_rate |= RATE_MCS_CCK_MSK;
733 return ucode_rate;
734 }
735
736 if (is_ht(rate)) {
737 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
738 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
739 index = IWL_LAST_HT_RATE;
740 }
741 ucode_rate |= RATE_MCS_HT_MSK;
742
743 if (is_ht_siso(rate))
744 ucode_rate |= iwl_rates[index].plcp_ht_siso;
745 else if (is_ht_mimo2(rate))
746 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
747 else
748 WARN_ON_ONCE(1);
749 } else if (is_vht(rate)) {
750 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
751 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
752 index = IWL_LAST_VHT_RATE;
753 }
754 ucode_rate |= RATE_MCS_VHT_MSK;
755 if (is_vht_siso(rate))
756 ucode_rate |= iwl_rates[index].plcp_vht_siso;
757 else if (is_vht_mimo2(rate))
758 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
759 else
760 WARN_ON_ONCE(1);
761
762 } else {
763 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
764 }
765
766 if (is_siso(rate) && rate->stbc) {
767 /* To enable STBC we need to set both a flag and ANT_AB */
768 ucode_rate |= RATE_MCS_ANT_AB_MSK;
769 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
770 }
771
772 ucode_rate |= rate->bw;
773 if (rate->sgi)
774 ucode_rate |= RATE_MCS_SGI_MSK;
775 if (rate->ldpc)
776 ucode_rate |= RATE_MCS_LDPC_MSK;
777
778 return ucode_rate;
779 }
780
781 /* Convert a ucode rate into an rs_rate object */
782 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
783 enum ieee80211_band band,
784 struct rs_rate *rate)
785 {
786 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
787 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
788 u8 nss;
789
790 memset(rate, 0, sizeof(*rate));
791 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
792
793 if (rate->index == IWL_RATE_INVALID)
794 return -EINVAL;
795
796 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
797
798 /* Legacy */
799 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
800 !(ucode_rate & RATE_MCS_VHT_MSK)) {
801 if (num_of_ant == 1) {
802 if (band == IEEE80211_BAND_5GHZ)
803 rate->type = LQ_LEGACY_A;
804 else
805 rate->type = LQ_LEGACY_G;
806 }
807
808 return 0;
809 }
810
811 /* HT or VHT */
812 if (ucode_rate & RATE_MCS_SGI_MSK)
813 rate->sgi = true;
814 if (ucode_rate & RATE_MCS_LDPC_MSK)
815 rate->ldpc = true;
816 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
817 rate->stbc = true;
818 if (ucode_rate & RATE_MCS_BF_MSK)
819 rate->bfer = true;
820
821 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
822
823 if (ucode_rate & RATE_MCS_HT_MSK) {
824 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
825 RATE_HT_MCS_NSS_POS) + 1;
826
827 if (nss == 1) {
828 rate->type = LQ_HT_SISO;
829 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
830 "stbc %d bfer %d",
831 rate->stbc, rate->bfer);
832 } else if (nss == 2) {
833 rate->type = LQ_HT_MIMO2;
834 WARN_ON_ONCE(num_of_ant != 2);
835 } else {
836 WARN_ON_ONCE(1);
837 }
838 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
839 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
840 RATE_VHT_MCS_NSS_POS) + 1;
841
842 if (nss == 1) {
843 rate->type = LQ_VHT_SISO;
844 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
845 "stbc %d bfer %d",
846 rate->stbc, rate->bfer);
847 } else if (nss == 2) {
848 rate->type = LQ_VHT_MIMO2;
849 WARN_ON_ONCE(num_of_ant != 2);
850 } else {
851 WARN_ON_ONCE(1);
852 }
853 }
854
855 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
856 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
857 !is_vht(rate));
858
859 return 0;
860 }
861
862 /* switch to another antenna/antennas and return 1 */
863 /* if no other valid antenna found, return 0 */
864 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
865 {
866 u8 new_ant_type;
867
868 if (!rate->ant || rate->ant > ANT_ABC)
869 return 0;
870
871 if (!rs_is_valid_ant(valid_ant, rate->ant))
872 return 0;
873
874 new_ant_type = ant_toggle_lookup[rate->ant];
875
876 while ((new_ant_type != rate->ant) &&
877 !rs_is_valid_ant(valid_ant, new_ant_type))
878 new_ant_type = ant_toggle_lookup[new_ant_type];
879
880 if (new_ant_type == rate->ant)
881 return 0;
882
883 rate->ant = new_ant_type;
884
885 return 1;
886 }
887
888 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
889 struct rs_rate *rate)
890 {
891 if (is_legacy(rate))
892 return lq_sta->active_legacy_rate;
893 else if (is_siso(rate))
894 return lq_sta->active_siso_rate;
895 else if (is_mimo2(rate))
896 return lq_sta->active_mimo2_rate;
897
898 WARN_ON_ONCE(1);
899 return 0;
900 }
901
902 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
903 int rate_type)
904 {
905 u8 high = IWL_RATE_INVALID;
906 u8 low = IWL_RATE_INVALID;
907
908 /* 802.11A or ht walks to the next literal adjacent rate in
909 * the rate table */
910 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
911 int i;
912 u32 mask;
913
914 /* Find the previous rate that is in the rate mask */
915 i = index - 1;
916 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
917 if (rate_mask & mask) {
918 low = i;
919 break;
920 }
921 }
922
923 /* Find the next rate that is in the rate mask */
924 i = index + 1;
925 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
926 if (rate_mask & mask) {
927 high = i;
928 break;
929 }
930 }
931
932 return (high << 8) | low;
933 }
934
935 low = index;
936 while (low != IWL_RATE_INVALID) {
937 low = iwl_rates[low].prev_rs;
938 if (low == IWL_RATE_INVALID)
939 break;
940 if (rate_mask & (1 << low))
941 break;
942 }
943
944 high = index;
945 while (high != IWL_RATE_INVALID) {
946 high = iwl_rates[high].next_rs;
947 if (high == IWL_RATE_INVALID)
948 break;
949 if (rate_mask & (1 << high))
950 break;
951 }
952
953 return (high << 8) | low;
954 }
955
956 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
957 struct rs_rate *rate)
958 {
959 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
960 }
961
962 /* Get the next supported lower rate in the current column.
963 * Return true if bottom rate in the current column was reached
964 */
965 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
966 struct rs_rate *rate)
967 {
968 u8 low;
969 u16 high_low;
970 u16 rate_mask;
971 struct iwl_mvm *mvm = lq_sta->pers.drv;
972
973 rate_mask = rs_get_supported_rates(lq_sta, rate);
974 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
975 rate->type);
976 low = high_low & 0xff;
977
978 /* Bottom rate of column reached */
979 if (low == IWL_RATE_INVALID)
980 return true;
981
982 rate->index = low;
983 return false;
984 }
985
986 /* Get the next rate to use following a column downgrade */
987 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
988 struct rs_rate *rate)
989 {
990 struct iwl_mvm *mvm = lq_sta->pers.drv;
991
992 if (is_legacy(rate)) {
993 /* No column to downgrade from Legacy */
994 return;
995 } else if (is_siso(rate)) {
996 /* Downgrade to Legacy if we were in SISO */
997 if (lq_sta->band == IEEE80211_BAND_5GHZ)
998 rate->type = LQ_LEGACY_A;
999 else
1000 rate->type = LQ_LEGACY_G;
1001
1002 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1003
1004 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1005 rate->index > IWL_RATE_MCS_9_INDEX);
1006
1007 rate->index = rs_ht_to_legacy[rate->index];
1008 rate->ldpc = false;
1009 } else {
1010 /* Downgrade to SISO with same MCS if in MIMO */
1011 rate->type = is_vht_mimo2(rate) ?
1012 LQ_VHT_SISO : LQ_HT_SISO;
1013 }
1014
1015 if (num_of_ant(rate->ant) > 1)
1016 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1017
1018 /* Relevant in both switching to SISO or Legacy */
1019 rate->sgi = false;
1020
1021 if (!rs_rate_supported(lq_sta, rate))
1022 rs_get_lower_rate_in_column(lq_sta, rate);
1023 }
1024
1025 /* Check if both rates are identical
1026 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1027 * with a rate indicating STBC/BFER and ANT_AB.
1028 */
1029 static inline bool rs_rate_equal(struct rs_rate *a,
1030 struct rs_rate *b,
1031 bool allow_ant_mismatch)
1032
1033 {
1034 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1035 (a->bfer == b->bfer);
1036
1037 if (allow_ant_mismatch) {
1038 if (a->stbc || a->bfer) {
1039 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1040 a->stbc, a->bfer, a->ant);
1041 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1042 } else if (b->stbc || b->bfer) {
1043 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1044 b->stbc, b->bfer, b->ant);
1045 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1046 }
1047 }
1048
1049 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1050 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1051 }
1052
1053 /* Check if both rates share the same column */
1054 static inline bool rs_rate_column_match(struct rs_rate *a,
1055 struct rs_rate *b)
1056 {
1057 bool ant_match;
1058
1059 if (a->stbc || a->bfer)
1060 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1061 else
1062 ant_match = (a->ant == b->ant);
1063
1064 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1065 && ant_match;
1066 }
1067
1068 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1069 {
1070 u8 tid = IWL_MAX_TID_COUNT;
1071
1072 if (ieee80211_is_data_qos(hdr->frame_control)) {
1073 u8 *qc = ieee80211_get_qos_ctl(hdr);
1074 tid = qc[0] & 0xf;
1075 }
1076
1077 if (unlikely(tid > IWL_MAX_TID_COUNT))
1078 tid = IWL_MAX_TID_COUNT;
1079
1080 return tid;
1081 }
1082
1083 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1084 int tid, struct ieee80211_tx_info *info)
1085 {
1086 int legacy_success;
1087 int retries;
1088 int i;
1089 struct iwl_lq_cmd *table;
1090 u32 lq_hwrate;
1091 struct rs_rate lq_rate, tx_resp_rate;
1092 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1093 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1094 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1095 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1096 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1097 bool allow_ant_mismatch = mvm->fw->ucode_capa.api[0] &
1098 IWL_UCODE_TLV_API_LQ_SS_PARAMS;
1099
1100 /* Treat uninitialized rate scaling data same as non-existing. */
1101 if (!lq_sta) {
1102 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1103 return;
1104 } else if (!lq_sta->pers.drv) {
1105 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1106 return;
1107 }
1108
1109 #ifdef CONFIG_MAC80211_DEBUGFS
1110 /* Disable last tx check if we are debugging with fixed rate */
1111 if (lq_sta->pers.dbg_fixed_rate) {
1112 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1113 return;
1114 }
1115 #endif
1116 /* This packet was aggregated but doesn't carry status info */
1117 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1118 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1119 return;
1120
1121 if (time_after(jiffies,
1122 (unsigned long)(lq_sta->last_tx +
1123 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1124 int t;
1125
1126 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1127 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1128 ieee80211_stop_tx_ba_session(sta, t);
1129
1130 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1131 return;
1132 }
1133 lq_sta->last_tx = jiffies;
1134
1135 /* Ignore this Tx frame response if its initial rate doesn't match
1136 * that of latest Link Quality command. There may be stragglers
1137 * from a previous Link Quality command, but we're no longer interested
1138 * in those; they're either from the "active" mode while we're trying
1139 * to check "search" mode, or a prior "search" mode after we've moved
1140 * to a new "search" mode (which might become the new "active" mode).
1141 */
1142 table = &lq_sta->lq;
1143 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1144 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1145 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1146
1147 /* Here we actually compare this rate to the latest LQ command */
1148 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1149 IWL_DEBUG_RATE(mvm,
1150 "initial tx resp rate 0x%x does not match 0x%x\n",
1151 tx_resp_hwrate, lq_hwrate);
1152
1153 /*
1154 * Since rates mis-match, the last LQ command may have failed.
1155 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1156 * ... driver.
1157 */
1158 lq_sta->missed_rate_counter++;
1159 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1160 lq_sta->missed_rate_counter = 0;
1161 IWL_DEBUG_RATE(mvm,
1162 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1163 lq_sta->rs_state);
1164 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1165 }
1166 /* Regardless, ignore this status info for outdated rate */
1167 return;
1168 } else
1169 /* Rate did match, so reset the missed_rate_counter */
1170 lq_sta->missed_rate_counter = 0;
1171
1172 if (!lq_sta->search_better_tbl) {
1173 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1174 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1175 } else {
1176 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1177 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1178 }
1179
1180 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1181 IWL_DEBUG_RATE(mvm,
1182 "Neither active nor search matches tx rate\n");
1183 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1184 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1185 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1186 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1187 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1188
1189 /*
1190 * no matching table found, let's by-pass the data collection
1191 * and continue to perform rate scale to find the rate table
1192 */
1193 rs_stay_in_table(lq_sta, true);
1194 goto done;
1195 }
1196
1197 /*
1198 * Updating the frame history depends on whether packets were
1199 * aggregated.
1200 *
1201 * For aggregation, all packets were transmitted at the same rate, the
1202 * first index into rate scale table.
1203 */
1204 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1205 /* ampdu_ack_len = 0 marks no BA was received. In this case
1206 * treat it as a single frame loss as we don't want the success
1207 * ratio to dip too quickly because a BA wasn't received
1208 */
1209 if (info->status.ampdu_ack_len == 0)
1210 info->status.ampdu_len = 1;
1211
1212 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1213 info->status.ampdu_len,
1214 info->status.ampdu_ack_len,
1215 reduced_txp);
1216
1217 /* Update success/fail counts if not searching for new mode */
1218 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1219 lq_sta->total_success += info->status.ampdu_ack_len;
1220 lq_sta->total_failed += (info->status.ampdu_len -
1221 info->status.ampdu_ack_len);
1222 }
1223 } else {
1224 /*
1225 * For legacy, update frame history with for each Tx retry.
1226 */
1227 retries = info->status.rates[0].count - 1;
1228 /* HW doesn't send more than 15 retries */
1229 retries = min(retries, 15);
1230
1231 /* The last transmission may have been successful */
1232 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1233 /* Collect data for each rate used during failed TX attempts */
1234 for (i = 0; i <= retries; ++i) {
1235 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1236 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1237 &lq_rate);
1238 /*
1239 * Only collect stats if retried rate is in the same RS
1240 * table as active/search.
1241 */
1242 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1243 tmp_tbl = curr_tbl;
1244 else if (rs_rate_column_match(&lq_rate,
1245 &other_tbl->rate))
1246 tmp_tbl = other_tbl;
1247 else
1248 continue;
1249
1250 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1251 1, i < retries ? 0 : legacy_success,
1252 reduced_txp);
1253 }
1254
1255 /* Update success/fail counts if not searching for new mode */
1256 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1257 lq_sta->total_success += legacy_success;
1258 lq_sta->total_failed += retries + (1 - legacy_success);
1259 }
1260 }
1261 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1262 lq_sta->last_rate_n_flags = lq_hwrate;
1263 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1264 done:
1265 /* See if there's a better rate or modulation mode to try. */
1266 if (sta->supp_rates[info->band])
1267 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1268 }
1269
1270 /*
1271 * mac80211 sends us Tx status
1272 */
1273 static void rs_mac80211_tx_status(void *mvm_r,
1274 struct ieee80211_supported_band *sband,
1275 struct ieee80211_sta *sta, void *priv_sta,
1276 struct sk_buff *skb)
1277 {
1278 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1279 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1280 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1281 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1282
1283 if (!ieee80211_is_data(hdr->frame_control) ||
1284 info->flags & IEEE80211_TX_CTL_NO_ACK)
1285 return;
1286
1287 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1288 }
1289
1290 /*
1291 * Begin a period of staying with a selected modulation mode.
1292 * Set "stay_in_tbl" flag to prevent any mode switches.
1293 * Set frame tx success limits according to legacy vs. high-throughput,
1294 * and reset overall (spanning all rates) tx success history statistics.
1295 * These control how long we stay using same modulation mode before
1296 * searching for a new mode.
1297 */
1298 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1299 struct iwl_lq_sta *lq_sta)
1300 {
1301 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1302 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1303 if (is_legacy) {
1304 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1305 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1306 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1307 } else {
1308 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1309 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1310 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1311 }
1312 lq_sta->table_count = 0;
1313 lq_sta->total_failed = 0;
1314 lq_sta->total_success = 0;
1315 lq_sta->flush_timer = jiffies;
1316 lq_sta->visited_columns = 0;
1317 }
1318
1319 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1320 {
1321 if (rate_mask)
1322 return find_last_bit(&rate_mask, BITS_PER_LONG);
1323 return IWL_RATE_INVALID;
1324 }
1325
1326 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1327 const struct rs_tx_column *column)
1328 {
1329 switch (column->mode) {
1330 case RS_LEGACY:
1331 return lq_sta->max_legacy_rate_idx;
1332 case RS_SISO:
1333 return lq_sta->max_siso_rate_idx;
1334 case RS_MIMO2:
1335 return lq_sta->max_mimo2_rate_idx;
1336 default:
1337 WARN_ON_ONCE(1);
1338 }
1339
1340 return lq_sta->max_legacy_rate_idx;
1341 }
1342
1343 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1344 const struct rs_tx_column *column,
1345 u32 bw)
1346 {
1347 /* Used to choose among HT tables */
1348 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1349
1350 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1351 column->mode != RS_SISO &&
1352 column->mode != RS_MIMO2))
1353 return expected_tpt_legacy;
1354
1355 /* Legacy rates have only one table */
1356 if (column->mode == RS_LEGACY)
1357 return expected_tpt_legacy;
1358
1359 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1360 /* Choose among many HT tables depending on number of streams
1361 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1362 * status */
1363 if (column->mode == RS_SISO) {
1364 switch (bw) {
1365 case RATE_MCS_CHAN_WIDTH_20:
1366 ht_tbl_pointer = expected_tpt_siso_20MHz;
1367 break;
1368 case RATE_MCS_CHAN_WIDTH_40:
1369 ht_tbl_pointer = expected_tpt_siso_40MHz;
1370 break;
1371 case RATE_MCS_CHAN_WIDTH_80:
1372 ht_tbl_pointer = expected_tpt_siso_80MHz;
1373 break;
1374 default:
1375 WARN_ON_ONCE(1);
1376 }
1377 } else if (column->mode == RS_MIMO2) {
1378 switch (bw) {
1379 case RATE_MCS_CHAN_WIDTH_20:
1380 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1381 break;
1382 case RATE_MCS_CHAN_WIDTH_40:
1383 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1384 break;
1385 case RATE_MCS_CHAN_WIDTH_80:
1386 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1387 break;
1388 default:
1389 WARN_ON_ONCE(1);
1390 }
1391 } else {
1392 WARN_ON_ONCE(1);
1393 }
1394
1395 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1396 return ht_tbl_pointer[0];
1397 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1398 return ht_tbl_pointer[1];
1399 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1400 return ht_tbl_pointer[2];
1401 else /* AGG+SGI */
1402 return ht_tbl_pointer[3];
1403 }
1404
1405 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1406 struct iwl_scale_tbl_info *tbl)
1407 {
1408 struct rs_rate *rate = &tbl->rate;
1409 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1410
1411 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1412 }
1413
1414 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1415 struct iwl_lq_sta *lq_sta,
1416 struct iwl_scale_tbl_info *tbl, /* "search" */
1417 unsigned long rate_mask, s8 index)
1418 {
1419 struct iwl_scale_tbl_info *active_tbl =
1420 &(lq_sta->lq_info[lq_sta->active_tbl]);
1421 s32 success_ratio = active_tbl->win[index].success_ratio;
1422 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1423 const u16 *tpt_tbl = tbl->expected_tpt;
1424 u16 high_low;
1425 u32 target_tpt;
1426 int rate_idx;
1427
1428 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1429 target_tpt = 100 * expected_current_tpt;
1430 IWL_DEBUG_RATE(mvm,
1431 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1432 success_ratio, target_tpt);
1433 } else {
1434 target_tpt = lq_sta->last_tpt;
1435 IWL_DEBUG_RATE(mvm,
1436 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1437 success_ratio, target_tpt);
1438 }
1439
1440 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1441
1442 while (rate_idx != IWL_RATE_INVALID) {
1443 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1444 break;
1445
1446 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1447 tbl->rate.type);
1448
1449 rate_idx = (high_low >> 8) & 0xff;
1450 }
1451
1452 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1453 rate_idx, target_tpt,
1454 rate_idx != IWL_RATE_INVALID ?
1455 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1456
1457 return rate_idx;
1458 }
1459
1460 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1461 {
1462 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1463 return RATE_MCS_CHAN_WIDTH_80;
1464 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1465 return RATE_MCS_CHAN_WIDTH_40;
1466
1467 return RATE_MCS_CHAN_WIDTH_20;
1468 }
1469
1470 /*
1471 * Check whether we should continue using same modulation mode, or
1472 * begin search for a new mode, based on:
1473 * 1) # tx successes or failures while using this mode
1474 * 2) # times calling this function
1475 * 3) elapsed time in this mode (not used, for now)
1476 */
1477 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1478 {
1479 struct iwl_scale_tbl_info *tbl;
1480 int active_tbl;
1481 int flush_interval_passed = 0;
1482 struct iwl_mvm *mvm;
1483
1484 mvm = lq_sta->pers.drv;
1485 active_tbl = lq_sta->active_tbl;
1486
1487 tbl = &(lq_sta->lq_info[active_tbl]);
1488
1489 /* If we've been disallowing search, see if we should now allow it */
1490 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1491 /* Elapsed time using current modulation mode */
1492 if (lq_sta->flush_timer)
1493 flush_interval_passed =
1494 time_after(jiffies,
1495 (unsigned long)(lq_sta->flush_timer +
1496 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1497
1498 /*
1499 * Check if we should allow search for new modulation mode.
1500 * If many frames have failed or succeeded, or we've used
1501 * this same modulation for a long time, allow search, and
1502 * reset history stats that keep track of whether we should
1503 * allow a new search. Also (below) reset all bitmaps and
1504 * stats in active history.
1505 */
1506 if (force_search ||
1507 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1508 (lq_sta->total_success > lq_sta->max_success_limit) ||
1509 ((!lq_sta->search_better_tbl) &&
1510 (lq_sta->flush_timer) && (flush_interval_passed))) {
1511 IWL_DEBUG_RATE(mvm,
1512 "LQ: stay is expired %d %d %d\n",
1513 lq_sta->total_failed,
1514 lq_sta->total_success,
1515 flush_interval_passed);
1516
1517 /* Allow search for new mode */
1518 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1519 IWL_DEBUG_RATE(mvm,
1520 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1521 lq_sta->total_failed = 0;
1522 lq_sta->total_success = 0;
1523 lq_sta->flush_timer = 0;
1524 /* mark the current column as visited */
1525 lq_sta->visited_columns = BIT(tbl->column);
1526 /*
1527 * Else if we've used this modulation mode enough repetitions
1528 * (regardless of elapsed time or success/failure), reset
1529 * history bitmaps and rate-specific stats for all rates in
1530 * active table.
1531 */
1532 } else {
1533 lq_sta->table_count++;
1534 if (lq_sta->table_count >=
1535 lq_sta->table_count_limit) {
1536 lq_sta->table_count = 0;
1537
1538 IWL_DEBUG_RATE(mvm,
1539 "LQ: stay in table clear win\n");
1540 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1541 }
1542 }
1543
1544 /* If transitioning to allow "search", reset all history
1545 * bitmaps and stats in active table (this will become the new
1546 * "search" table). */
1547 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1548 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1549 }
1550 }
1551 }
1552
1553 /*
1554 * setup rate table in uCode
1555 */
1556 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1557 struct ieee80211_sta *sta,
1558 struct iwl_lq_sta *lq_sta,
1559 struct rs_rate *rate)
1560 {
1561 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1562 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1563 }
1564
1565 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1566 struct iwl_lq_sta *lq_sta,
1567 struct ieee80211_sta *sta,
1568 struct iwl_scale_tbl_info *tbl)
1569 {
1570 int i, j, max_rate;
1571 enum rs_column next_col_id;
1572 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1573 const struct rs_tx_column *next_col;
1574 allow_column_func_t allow_func;
1575 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1576 const u16 *expected_tpt_tbl;
1577 u16 tpt, max_expected_tpt;
1578
1579 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1580 next_col_id = curr_col->next_columns[i];
1581
1582 if (next_col_id == RS_COLUMN_INVALID)
1583 continue;
1584
1585 if (lq_sta->visited_columns & BIT(next_col_id)) {
1586 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1587 next_col_id);
1588 continue;
1589 }
1590
1591 next_col = &rs_tx_columns[next_col_id];
1592
1593 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1594 IWL_DEBUG_RATE(mvm,
1595 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1596 next_col_id, valid_ants, next_col->ant);
1597 continue;
1598 }
1599
1600 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1601 allow_func = next_col->checks[j];
1602 if (allow_func && !allow_func(mvm, sta, tbl, next_col))
1603 break;
1604 }
1605
1606 if (j != MAX_COLUMN_CHECKS) {
1607 IWL_DEBUG_RATE(mvm,
1608 "Skip column %d: not allowed (check %d failed)\n",
1609 next_col_id, j);
1610
1611 continue;
1612 }
1613
1614 tpt = lq_sta->last_tpt / 100;
1615 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1616 rs_bw_from_sta_bw(sta));
1617 if (WARN_ON_ONCE(!expected_tpt_tbl))
1618 continue;
1619
1620 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1621 if (max_rate == IWL_RATE_INVALID) {
1622 IWL_DEBUG_RATE(mvm,
1623 "Skip column %d: no rate is allowed in this column\n",
1624 next_col_id);
1625 continue;
1626 }
1627
1628 max_expected_tpt = expected_tpt_tbl[max_rate];
1629 if (tpt >= max_expected_tpt) {
1630 IWL_DEBUG_RATE(mvm,
1631 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1632 next_col_id, max_expected_tpt, tpt);
1633 continue;
1634 }
1635
1636 IWL_DEBUG_RATE(mvm,
1637 "Found potential column %d. Max expected %d current %d\n",
1638 next_col_id, max_expected_tpt, tpt);
1639 break;
1640 }
1641
1642 if (i == MAX_NEXT_COLUMNS)
1643 return RS_COLUMN_INVALID;
1644
1645 return next_col_id;
1646 }
1647
1648 static int rs_switch_to_column(struct iwl_mvm *mvm,
1649 struct iwl_lq_sta *lq_sta,
1650 struct ieee80211_sta *sta,
1651 enum rs_column col_id)
1652 {
1653 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1654 struct iwl_scale_tbl_info *search_tbl =
1655 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1656 struct rs_rate *rate = &search_tbl->rate;
1657 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1658 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1659 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1660 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1661 unsigned long rate_mask = 0;
1662 u32 rate_idx = 0;
1663
1664 memcpy(search_tbl, tbl, sz);
1665
1666 rate->sgi = column->sgi;
1667 rate->ant = column->ant;
1668
1669 if (column->mode == RS_LEGACY) {
1670 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1671 rate->type = LQ_LEGACY_A;
1672 else
1673 rate->type = LQ_LEGACY_G;
1674
1675 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1676 rate->ldpc = false;
1677 rate_mask = lq_sta->active_legacy_rate;
1678 } else if (column->mode == RS_SISO) {
1679 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1680 rate_mask = lq_sta->active_siso_rate;
1681 } else if (column->mode == RS_MIMO2) {
1682 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1683 rate_mask = lq_sta->active_mimo2_rate;
1684 } else {
1685 WARN_ON_ONCE("Bad column mode");
1686 }
1687
1688 if (column->mode != RS_LEGACY) {
1689 rate->bw = rs_bw_from_sta_bw(sta);
1690 rate->ldpc = lq_sta->ldpc;
1691 }
1692
1693 search_tbl->column = col_id;
1694 rs_set_expected_tpt_table(lq_sta, search_tbl);
1695
1696 lq_sta->visited_columns |= BIT(col_id);
1697
1698 /* Get the best matching rate if we're changing modes. e.g.
1699 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1700 */
1701 if (curr_column->mode != column->mode) {
1702 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1703 rate_mask, rate->index);
1704
1705 if ((rate_idx == IWL_RATE_INVALID) ||
1706 !(BIT(rate_idx) & rate_mask)) {
1707 IWL_DEBUG_RATE(mvm,
1708 "can not switch with index %d"
1709 " rate mask %lx\n",
1710 rate_idx, rate_mask);
1711
1712 goto err;
1713 }
1714
1715 rate->index = rate_idx;
1716 }
1717
1718 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1719 col_id, rate->index);
1720
1721 return 0;
1722
1723 err:
1724 rate->type = LQ_NONE;
1725 return -1;
1726 }
1727
1728 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1729 struct iwl_scale_tbl_info *tbl,
1730 s32 sr, int low, int high,
1731 int current_tpt,
1732 int low_tpt, int high_tpt)
1733 {
1734 enum rs_action action = RS_ACTION_STAY;
1735
1736 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1737 (current_tpt == 0)) {
1738 IWL_DEBUG_RATE(mvm,
1739 "Decrease rate because of low SR\n");
1740 return RS_ACTION_DOWNSCALE;
1741 }
1742
1743 if ((low_tpt == IWL_INVALID_VALUE) &&
1744 (high_tpt == IWL_INVALID_VALUE) &&
1745 (high != IWL_RATE_INVALID)) {
1746 IWL_DEBUG_RATE(mvm,
1747 "No data about high/low rates. Increase rate\n");
1748 return RS_ACTION_UPSCALE;
1749 }
1750
1751 if ((high_tpt == IWL_INVALID_VALUE) &&
1752 (high != IWL_RATE_INVALID) &&
1753 (low_tpt != IWL_INVALID_VALUE) &&
1754 (low_tpt < current_tpt)) {
1755 IWL_DEBUG_RATE(mvm,
1756 "No data about high rate and low rate is worse. Increase rate\n");
1757 return RS_ACTION_UPSCALE;
1758 }
1759
1760 if ((high_tpt != IWL_INVALID_VALUE) &&
1761 (high_tpt > current_tpt)) {
1762 IWL_DEBUG_RATE(mvm,
1763 "Higher rate is better. Increate rate\n");
1764 return RS_ACTION_UPSCALE;
1765 }
1766
1767 if ((low_tpt != IWL_INVALID_VALUE) &&
1768 (high_tpt != IWL_INVALID_VALUE) &&
1769 (low_tpt < current_tpt) &&
1770 (high_tpt < current_tpt)) {
1771 IWL_DEBUG_RATE(mvm,
1772 "Both high and low are worse. Maintain rate\n");
1773 return RS_ACTION_STAY;
1774 }
1775
1776 if ((low_tpt != IWL_INVALID_VALUE) &&
1777 (low_tpt > current_tpt)) {
1778 IWL_DEBUG_RATE(mvm,
1779 "Lower rate is better\n");
1780 action = RS_ACTION_DOWNSCALE;
1781 goto out;
1782 }
1783
1784 if ((low_tpt == IWL_INVALID_VALUE) &&
1785 (low != IWL_RATE_INVALID)) {
1786 IWL_DEBUG_RATE(mvm,
1787 "No data about lower rate\n");
1788 action = RS_ACTION_DOWNSCALE;
1789 goto out;
1790 }
1791
1792 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1793
1794 out:
1795 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1796 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1797 IWL_DEBUG_RATE(mvm,
1798 "SR is above NO DECREASE. Avoid downscale\n");
1799 action = RS_ACTION_STAY;
1800 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1801 IWL_DEBUG_RATE(mvm,
1802 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1803 action = RS_ACTION_STAY;
1804 } else {
1805 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1806 }
1807 }
1808
1809 return action;
1810 }
1811
1812 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1813 struct iwl_lq_sta *lq_sta)
1814 {
1815 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1816 * supports STBC of at least 1*SS
1817 */
1818 if (!lq_sta->stbc_capable)
1819 return false;
1820
1821 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1822 return false;
1823
1824 return true;
1825 }
1826
1827 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1828 int *weaker, int *stronger)
1829 {
1830 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1831 if (*weaker > TPC_MAX_REDUCTION)
1832 *weaker = TPC_INVALID;
1833
1834 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1835 if (*stronger < 0)
1836 *stronger = TPC_INVALID;
1837 }
1838
1839 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1840 struct rs_rate *rate, enum ieee80211_band band)
1841 {
1842 int index = rate->index;
1843 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1844 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1845 !vif->bss_conf.ps);
1846
1847 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1848 cam, sta_ps_disabled);
1849 /*
1850 * allow tpc only if power management is enabled, or bt coex
1851 * activity grade allows it and we are on 2.4Ghz.
1852 */
1853 if ((cam || sta_ps_disabled) &&
1854 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1855 return false;
1856
1857 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1858 if (is_legacy(rate))
1859 return index == IWL_RATE_54M_INDEX;
1860 if (is_ht(rate))
1861 return index == IWL_RATE_MCS_7_INDEX;
1862 if (is_vht(rate))
1863 return index == IWL_RATE_MCS_7_INDEX ||
1864 index == IWL_RATE_MCS_8_INDEX ||
1865 index == IWL_RATE_MCS_9_INDEX;
1866
1867 WARN_ON_ONCE(1);
1868 return false;
1869 }
1870
1871 enum tpc_action {
1872 TPC_ACTION_STAY,
1873 TPC_ACTION_DECREASE,
1874 TPC_ACTION_INCREASE,
1875 TPC_ACTION_NO_RESTIRCTION,
1876 };
1877
1878 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1879 s32 sr, int weak, int strong,
1880 int current_tpt,
1881 int weak_tpt, int strong_tpt)
1882 {
1883 /* stay until we have valid tpt */
1884 if (current_tpt == IWL_INVALID_VALUE) {
1885 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1886 return TPC_ACTION_STAY;
1887 }
1888
1889 /* Too many failures, increase txp */
1890 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1891 current_tpt == 0) {
1892 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1893 return TPC_ACTION_NO_RESTIRCTION;
1894 }
1895
1896 /* try decreasing first if applicable */
1897 if (weak != TPC_INVALID) {
1898 if (weak_tpt == IWL_INVALID_VALUE &&
1899 (strong_tpt == IWL_INVALID_VALUE ||
1900 current_tpt >= strong_tpt)) {
1901 IWL_DEBUG_RATE(mvm,
1902 "no weak txp measurement. decrease txp\n");
1903 return TPC_ACTION_DECREASE;
1904 }
1905
1906 if (weak_tpt > current_tpt) {
1907 IWL_DEBUG_RATE(mvm,
1908 "lower txp has better tpt. decrease txp\n");
1909 return TPC_ACTION_DECREASE;
1910 }
1911 }
1912
1913 /* next, increase if needed */
1914 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1915 strong != TPC_INVALID) {
1916 if (weak_tpt == IWL_INVALID_VALUE &&
1917 strong_tpt != IWL_INVALID_VALUE &&
1918 current_tpt < strong_tpt) {
1919 IWL_DEBUG_RATE(mvm,
1920 "higher txp has better tpt. increase txp\n");
1921 return TPC_ACTION_INCREASE;
1922 }
1923
1924 if (weak_tpt < current_tpt &&
1925 (strong_tpt == IWL_INVALID_VALUE ||
1926 strong_tpt > current_tpt)) {
1927 IWL_DEBUG_RATE(mvm,
1928 "lower txp has worse tpt. increase txp\n");
1929 return TPC_ACTION_INCREASE;
1930 }
1931 }
1932
1933 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1934 return TPC_ACTION_STAY;
1935 }
1936
1937 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1938 struct ieee80211_sta *sta,
1939 struct iwl_lq_sta *lq_sta,
1940 struct iwl_scale_tbl_info *tbl)
1941 {
1942 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1943 struct ieee80211_vif *vif = mvm_sta->vif;
1944 struct ieee80211_chanctx_conf *chanctx_conf;
1945 enum ieee80211_band band;
1946 struct iwl_rate_scale_data *window;
1947 struct rs_rate *rate = &tbl->rate;
1948 enum tpc_action action;
1949 s32 sr;
1950 u8 cur = lq_sta->lq.reduced_tpc;
1951 int current_tpt;
1952 int weak, strong;
1953 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1954
1955 #ifdef CONFIG_MAC80211_DEBUGFS
1956 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1957 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1958 lq_sta->pers.dbg_fixed_txp_reduction);
1959 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1960 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1961 }
1962 #endif
1963
1964 rcu_read_lock();
1965 chanctx_conf = rcu_dereference(vif->chanctx_conf);
1966 if (WARN_ON(!chanctx_conf))
1967 band = IEEE80211_NUM_BANDS;
1968 else
1969 band = chanctx_conf->def.chan->band;
1970 rcu_read_unlock();
1971
1972 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1973 IWL_DEBUG_RATE(mvm,
1974 "tpc is not allowed. remove txp restrictions\n");
1975 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1976 return cur != TPC_NO_REDUCTION;
1977 }
1978
1979 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1980
1981 /* Collect measured throughputs for current and adjacent rates */
1982 window = tbl->tpc_win;
1983 sr = window[cur].success_ratio;
1984 current_tpt = window[cur].average_tpt;
1985 if (weak != TPC_INVALID)
1986 weak_tpt = window[weak].average_tpt;
1987 if (strong != TPC_INVALID)
1988 strong_tpt = window[strong].average_tpt;
1989
1990 IWL_DEBUG_RATE(mvm,
1991 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1992 cur, current_tpt, sr, weak, strong,
1993 weak_tpt, strong_tpt);
1994
1995 action = rs_get_tpc_action(mvm, sr, weak, strong,
1996 current_tpt, weak_tpt, strong_tpt);
1997
1998 /* override actions if we are on the edge */
1999 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2000 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2001 action = TPC_ACTION_STAY;
2002 } else if (strong == TPC_INVALID &&
2003 (action == TPC_ACTION_INCREASE ||
2004 action == TPC_ACTION_NO_RESTIRCTION)) {
2005 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2006 action = TPC_ACTION_STAY;
2007 }
2008
2009 switch (action) {
2010 case TPC_ACTION_DECREASE:
2011 lq_sta->lq.reduced_tpc = weak;
2012 return true;
2013 case TPC_ACTION_INCREASE:
2014 lq_sta->lq.reduced_tpc = strong;
2015 return true;
2016 case TPC_ACTION_NO_RESTIRCTION:
2017 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2018 return true;
2019 case TPC_ACTION_STAY:
2020 /* do nothing */
2021 break;
2022 }
2023 return false;
2024 }
2025
2026 /*
2027 * Do rate scaling and search for new modulation mode.
2028 */
2029 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2030 struct ieee80211_sta *sta,
2031 struct iwl_lq_sta *lq_sta,
2032 int tid)
2033 {
2034 int low = IWL_RATE_INVALID;
2035 int high = IWL_RATE_INVALID;
2036 int index;
2037 struct iwl_rate_scale_data *window = NULL;
2038 int current_tpt = IWL_INVALID_VALUE;
2039 int low_tpt = IWL_INVALID_VALUE;
2040 int high_tpt = IWL_INVALID_VALUE;
2041 u32 fail_count;
2042 enum rs_action scale_action = RS_ACTION_STAY;
2043 u16 rate_mask;
2044 u8 update_lq = 0;
2045 struct iwl_scale_tbl_info *tbl, *tbl1;
2046 u8 active_tbl = 0;
2047 u8 done_search = 0;
2048 u16 high_low;
2049 s32 sr;
2050 u8 prev_agg = lq_sta->is_agg;
2051 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2052 struct iwl_mvm_tid_data *tid_data;
2053 struct rs_rate *rate;
2054
2055 lq_sta->is_agg = !!sta_priv->agg_tids;
2056
2057 /*
2058 * Select rate-scale / modulation-mode table to work with in
2059 * the rest of this function: "search" if searching for better
2060 * modulation mode, or "active" if doing rate scaling within a mode.
2061 */
2062 if (!lq_sta->search_better_tbl)
2063 active_tbl = lq_sta->active_tbl;
2064 else
2065 active_tbl = 1 - lq_sta->active_tbl;
2066
2067 tbl = &(lq_sta->lq_info[active_tbl]);
2068 rate = &tbl->rate;
2069
2070 if (prev_agg != lq_sta->is_agg) {
2071 IWL_DEBUG_RATE(mvm,
2072 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2073 prev_agg, lq_sta->is_agg);
2074 rs_set_expected_tpt_table(lq_sta, tbl);
2075 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2076 }
2077
2078 /* current tx rate */
2079 index = lq_sta->last_txrate_idx;
2080
2081 /* rates available for this association, and for modulation mode */
2082 rate_mask = rs_get_supported_rates(lq_sta, rate);
2083
2084 if (!(BIT(index) & rate_mask)) {
2085 IWL_ERR(mvm, "Current Rate is not valid\n");
2086 if (lq_sta->search_better_tbl) {
2087 /* revert to active table if search table is not valid*/
2088 rate->type = LQ_NONE;
2089 lq_sta->search_better_tbl = 0;
2090 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2091 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2092 }
2093 return;
2094 }
2095
2096 /* Get expected throughput table and history window for current rate */
2097 if (!tbl->expected_tpt) {
2098 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2099 return;
2100 }
2101
2102 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2103 window = &(tbl->win[index]);
2104
2105 /*
2106 * If there is not enough history to calculate actual average
2107 * throughput, keep analyzing results of more tx frames, without
2108 * changing rate or mode (bypass most of the rest of this function).
2109 * Set up new rate table in uCode only if old rate is not supported
2110 * in current association (use new rate found above).
2111 */
2112 fail_count = window->counter - window->success_counter;
2113 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2114 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2115 IWL_DEBUG_RATE(mvm,
2116 "(%s: %d): Test Window: succ %d total %d\n",
2117 rs_pretty_lq_type(rate->type),
2118 index, window->success_counter, window->counter);
2119
2120 /* Can't calculate this yet; not enough history */
2121 window->average_tpt = IWL_INVALID_VALUE;
2122
2123 /* Should we stay with this modulation mode,
2124 * or search for a new one? */
2125 rs_stay_in_table(lq_sta, false);
2126
2127 goto out;
2128 }
2129 /* Else we have enough samples; calculate estimate of
2130 * actual average throughput */
2131 if (window->average_tpt != ((window->success_ratio *
2132 tbl->expected_tpt[index] + 64) / 128)) {
2133 window->average_tpt = ((window->success_ratio *
2134 tbl->expected_tpt[index] + 64) / 128);
2135 }
2136
2137 /* If we are searching for better modulation mode, check success. */
2138 if (lq_sta->search_better_tbl) {
2139 /* If good success, continue using the "search" mode;
2140 * no need to send new link quality command, since we're
2141 * continuing to use the setup that we've been trying. */
2142 if (window->average_tpt > lq_sta->last_tpt) {
2143 IWL_DEBUG_RATE(mvm,
2144 "SWITCHING TO NEW TABLE SR: %d "
2145 "cur-tpt %d old-tpt %d\n",
2146 window->success_ratio,
2147 window->average_tpt,
2148 lq_sta->last_tpt);
2149
2150 /* Swap tables; "search" becomes "active" */
2151 lq_sta->active_tbl = active_tbl;
2152 current_tpt = window->average_tpt;
2153 /* Else poor success; go back to mode in "active" table */
2154 } else {
2155 IWL_DEBUG_RATE(mvm,
2156 "GOING BACK TO THE OLD TABLE: SR %d "
2157 "cur-tpt %d old-tpt %d\n",
2158 window->success_ratio,
2159 window->average_tpt,
2160 lq_sta->last_tpt);
2161
2162 /* Nullify "search" table */
2163 rate->type = LQ_NONE;
2164
2165 /* Revert to "active" table */
2166 active_tbl = lq_sta->active_tbl;
2167 tbl = &(lq_sta->lq_info[active_tbl]);
2168
2169 /* Revert to "active" rate and throughput info */
2170 index = tbl->rate.index;
2171 current_tpt = lq_sta->last_tpt;
2172
2173 /* Need to set up a new rate table in uCode */
2174 update_lq = 1;
2175 }
2176
2177 /* Either way, we've made a decision; modulation mode
2178 * search is done, allow rate adjustment next time. */
2179 lq_sta->search_better_tbl = 0;
2180 done_search = 1; /* Don't switch modes below! */
2181 goto lq_update;
2182 }
2183
2184 /* (Else) not in search of better modulation mode, try for better
2185 * starting rate, while staying in this mode. */
2186 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2187 low = high_low & 0xff;
2188 high = (high_low >> 8) & 0xff;
2189
2190 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2191
2192 sr = window->success_ratio;
2193
2194 /* Collect measured throughputs for current and adjacent rates */
2195 current_tpt = window->average_tpt;
2196 if (low != IWL_RATE_INVALID)
2197 low_tpt = tbl->win[low].average_tpt;
2198 if (high != IWL_RATE_INVALID)
2199 high_tpt = tbl->win[high].average_tpt;
2200
2201 IWL_DEBUG_RATE(mvm,
2202 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2203 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2204 low, high, low_tpt, high_tpt);
2205
2206 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2207 current_tpt, low_tpt, high_tpt);
2208
2209 /* Force a search in case BT doesn't like us being in MIMO */
2210 if (is_mimo(rate) &&
2211 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2212 IWL_DEBUG_RATE(mvm,
2213 "BT Coex forbids MIMO. Search for new config\n");
2214 rs_stay_in_table(lq_sta, true);
2215 goto lq_update;
2216 }
2217
2218 switch (scale_action) {
2219 case RS_ACTION_DOWNSCALE:
2220 /* Decrease starting rate, update uCode's rate table */
2221 if (low != IWL_RATE_INVALID) {
2222 update_lq = 1;
2223 index = low;
2224 } else {
2225 IWL_DEBUG_RATE(mvm,
2226 "At the bottom rate. Can't decrease\n");
2227 }
2228
2229 break;
2230 case RS_ACTION_UPSCALE:
2231 /* Increase starting rate, update uCode's rate table */
2232 if (high != IWL_RATE_INVALID) {
2233 update_lq = 1;
2234 index = high;
2235 } else {
2236 IWL_DEBUG_RATE(mvm,
2237 "At the top rate. Can't increase\n");
2238 }
2239
2240 break;
2241 case RS_ACTION_STAY:
2242 /* No change */
2243 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2244 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2245 break;
2246 default:
2247 break;
2248 }
2249
2250 lq_update:
2251 /* Replace uCode's rate table for the destination station. */
2252 if (update_lq) {
2253 tbl->rate.index = index;
2254 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2255 }
2256
2257 rs_stay_in_table(lq_sta, false);
2258
2259 /*
2260 * Search for new modulation mode if we're:
2261 * 1) Not changing rates right now
2262 * 2) Not just finishing up a search
2263 * 3) Allowing a new search
2264 */
2265 if (!update_lq && !done_search &&
2266 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2267 && window->counter) {
2268 enum rs_column next_column;
2269
2270 /* Save current throughput to compare with "search" throughput*/
2271 lq_sta->last_tpt = current_tpt;
2272
2273 IWL_DEBUG_RATE(mvm,
2274 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2275 update_lq, done_search, lq_sta->rs_state,
2276 window->counter);
2277
2278 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2279 if (next_column != RS_COLUMN_INVALID) {
2280 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2281 next_column);
2282 if (!ret)
2283 lq_sta->search_better_tbl = 1;
2284 } else {
2285 IWL_DEBUG_RATE(mvm,
2286 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2287 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2288 }
2289
2290 /* If new "search" mode was selected, set up in uCode table */
2291 if (lq_sta->search_better_tbl) {
2292 /* Access the "search" table, clear its history. */
2293 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2294 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2295
2296 /* Use new "search" start rate */
2297 index = tbl->rate.index;
2298
2299 rs_dump_rate(mvm, &tbl->rate,
2300 "Switch to SEARCH TABLE:");
2301 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2302 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2303 } else {
2304 done_search = 1;
2305 }
2306 }
2307
2308 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2309 /* If the "active" (non-search) mode was legacy,
2310 * and we've tried switching antennas,
2311 * but we haven't been able to try HT modes (not available),
2312 * stay with best antenna legacy modulation for a while
2313 * before next round of mode comparisons. */
2314 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2315 if (is_legacy(&tbl1->rate)) {
2316 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2317
2318 if (tid != IWL_MAX_TID_COUNT) {
2319 tid_data = &sta_priv->tid_data[tid];
2320 if (tid_data->state != IWL_AGG_OFF) {
2321 IWL_DEBUG_RATE(mvm,
2322 "Stop aggregation on tid %d\n",
2323 tid);
2324 ieee80211_stop_tx_ba_session(sta, tid);
2325 }
2326 }
2327 rs_set_stay_in_table(mvm, 1, lq_sta);
2328 } else {
2329 /* If we're in an HT mode, and all 3 mode switch actions
2330 * have been tried and compared, stay in this best modulation
2331 * mode for a while before next round of mode comparisons. */
2332 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2333 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2334 (tid != IWL_MAX_TID_COUNT)) {
2335 tid_data = &sta_priv->tid_data[tid];
2336 if (tid_data->state == IWL_AGG_OFF) {
2337 IWL_DEBUG_RATE(mvm,
2338 "try to aggregate tid %d\n",
2339 tid);
2340 rs_tl_turn_on_agg(mvm, tid,
2341 lq_sta, sta);
2342 }
2343 }
2344 rs_set_stay_in_table(mvm, 0, lq_sta);
2345 }
2346 }
2347
2348 out:
2349 lq_sta->last_txrate_idx = index;
2350 }
2351
2352 struct rs_init_rate_info {
2353 s8 rssi;
2354 u8 rate_idx;
2355 };
2356
2357 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2358 { -60, IWL_RATE_54M_INDEX },
2359 { -64, IWL_RATE_48M_INDEX },
2360 { -68, IWL_RATE_36M_INDEX },
2361 { -80, IWL_RATE_24M_INDEX },
2362 { -84, IWL_RATE_18M_INDEX },
2363 { -85, IWL_RATE_12M_INDEX },
2364 { -86, IWL_RATE_11M_INDEX },
2365 { -88, IWL_RATE_5M_INDEX },
2366 { -90, IWL_RATE_2M_INDEX },
2367 { S8_MIN, IWL_RATE_1M_INDEX },
2368 };
2369
2370 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2371 { -60, IWL_RATE_54M_INDEX },
2372 { -64, IWL_RATE_48M_INDEX },
2373 { -72, IWL_RATE_36M_INDEX },
2374 { -80, IWL_RATE_24M_INDEX },
2375 { -84, IWL_RATE_18M_INDEX },
2376 { -85, IWL_RATE_12M_INDEX },
2377 { -87, IWL_RATE_9M_INDEX },
2378 { S8_MIN, IWL_RATE_6M_INDEX },
2379 };
2380
2381 /* Choose an initial legacy rate and antenna to use based on the RSSI
2382 * of last Rx
2383 */
2384 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2385 struct iwl_lq_sta *lq_sta,
2386 enum ieee80211_band band,
2387 struct rs_rate *rate)
2388 {
2389 int i, nentries;
2390 s8 best_rssi = S8_MIN;
2391 u8 best_ant = ANT_NONE;
2392 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2393 const struct rs_init_rate_info *initial_rates;
2394
2395 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2396 if (!(lq_sta->pers.chains & BIT(i)))
2397 continue;
2398
2399 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2400 best_rssi = lq_sta->pers.chain_signal[i];
2401 best_ant = BIT(i);
2402 }
2403 }
2404
2405 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2406 rs_pretty_ant(best_ant), best_rssi);
2407
2408 if (best_ant != ANT_A && best_ant != ANT_B)
2409 rate->ant = first_antenna(valid_tx_ant);
2410 else
2411 rate->ant = best_ant;
2412
2413 rate->sgi = false;
2414 rate->ldpc = false;
2415 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2416
2417 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2418 BITS_PER_LONG);
2419
2420 if (band == IEEE80211_BAND_5GHZ) {
2421 rate->type = LQ_LEGACY_A;
2422 initial_rates = rs_init_rates_5ghz;
2423 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2424 } else {
2425 rate->type = LQ_LEGACY_G;
2426 initial_rates = rs_init_rates_24ghz;
2427 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2428 }
2429
2430 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2431 for (i = 0; i < nentries; i++) {
2432 int rate_idx = initial_rates[i].rate_idx;
2433 if ((best_rssi >= initial_rates[i].rssi) &&
2434 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2435 rate->index = rate_idx;
2436 break;
2437 }
2438 }
2439 }
2440
2441 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2442 rs_pretty_ant(rate->ant));
2443 }
2444
2445 /* Save info about RSSI of last Rx */
2446 void rs_update_last_rssi(struct iwl_mvm *mvm,
2447 struct iwl_lq_sta *lq_sta,
2448 struct ieee80211_rx_status *rx_status)
2449 {
2450 lq_sta->pers.chains = rx_status->chains;
2451 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2452 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2453 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2454 }
2455
2456 /**
2457 * rs_initialize_lq - Initialize a station's hardware rate table
2458 *
2459 * The uCode's station table contains a table of fallback rates
2460 * for automatic fallback during transmission.
2461 *
2462 * NOTE: This sets up a default set of values. These will be replaced later
2463 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2464 * rc80211_simple.
2465 *
2466 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2467 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2468 * which requires station table entry to exist).
2469 */
2470 static void rs_initialize_lq(struct iwl_mvm *mvm,
2471 struct ieee80211_sta *sta,
2472 struct iwl_lq_sta *lq_sta,
2473 enum ieee80211_band band,
2474 bool init)
2475 {
2476 struct iwl_scale_tbl_info *tbl;
2477 struct rs_rate *rate;
2478 u8 active_tbl = 0;
2479
2480 if (!sta || !lq_sta)
2481 return;
2482
2483 if (!lq_sta->search_better_tbl)
2484 active_tbl = lq_sta->active_tbl;
2485 else
2486 active_tbl = 1 - lq_sta->active_tbl;
2487
2488 tbl = &(lq_sta->lq_info[active_tbl]);
2489 rate = &tbl->rate;
2490
2491 rs_get_initial_rate(mvm, lq_sta, band, rate);
2492 lq_sta->last_txrate_idx = rate->index;
2493
2494 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2495 if (rate->ant == ANT_A)
2496 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2497 else
2498 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2499
2500 rs_set_expected_tpt_table(lq_sta, tbl);
2501 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2502 /* TODO restore station should remember the lq cmd */
2503 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2504 }
2505
2506 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2507 struct ieee80211_tx_rate_control *txrc)
2508 {
2509 struct sk_buff *skb = txrc->skb;
2510 struct iwl_op_mode *op_mode __maybe_unused =
2511 (struct iwl_op_mode *)mvm_r;
2512 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2513 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2514 struct iwl_lq_sta *lq_sta = mvm_sta;
2515
2516 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2517
2518 /* Treat uninitialized rate scaling data same as non-existing. */
2519 if (lq_sta && !lq_sta->pers.drv) {
2520 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2521 mvm_sta = NULL;
2522 }
2523
2524 /* Send management frames and NO_ACK data using lowest rate. */
2525 if (rate_control_send_low(sta, mvm_sta, txrc))
2526 return;
2527
2528 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2529 info->band, &info->control.rates[0]);
2530
2531 info->control.rates[0].count = 1;
2532 }
2533
2534 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2535 gfp_t gfp)
2536 {
2537 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2538 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2539 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2540 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2541
2542 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2543
2544 lq_sta->pers.drv = mvm;
2545 #ifdef CONFIG_MAC80211_DEBUGFS
2546 lq_sta->pers.dbg_fixed_rate = 0;
2547 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2548 #endif
2549 lq_sta->pers.chains = 0;
2550 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2551
2552 return &sta_priv->lq_sta;
2553 }
2554
2555 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2556 int nss)
2557 {
2558 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2559 (0x3 << (2 * (nss - 1)));
2560 rx_mcs >>= (2 * (nss - 1));
2561
2562 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2563 return IWL_RATE_MCS_7_INDEX;
2564 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2565 return IWL_RATE_MCS_8_INDEX;
2566 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2567 return IWL_RATE_MCS_9_INDEX;
2568
2569 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2570 return -1;
2571 }
2572
2573 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2574 struct ieee80211_sta_vht_cap *vht_cap,
2575 struct iwl_lq_sta *lq_sta)
2576 {
2577 int i;
2578 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2579
2580 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2581 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2582 if (i == IWL_RATE_9M_INDEX)
2583 continue;
2584
2585 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2586 if (i == IWL_RATE_MCS_9_INDEX &&
2587 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2588 continue;
2589
2590 lq_sta->active_siso_rate |= BIT(i);
2591 }
2592 }
2593
2594 if (sta->rx_nss < 2)
2595 return;
2596
2597 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2598 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2599 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2600 if (i == IWL_RATE_9M_INDEX)
2601 continue;
2602
2603 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2604 if (i == IWL_RATE_MCS_9_INDEX &&
2605 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2606 continue;
2607
2608 lq_sta->active_mimo2_rate |= BIT(i);
2609 }
2610 }
2611 }
2612
2613 static void rs_ht_init(struct iwl_mvm *mvm,
2614 struct ieee80211_sta *sta,
2615 struct iwl_lq_sta *lq_sta,
2616 struct ieee80211_sta_ht_cap *ht_cap)
2617 {
2618 /* active_siso_rate mask includes 9 MBits (bit 5),
2619 * and CCK (bits 0-3), supp_rates[] does not;
2620 * shift to convert format, force 9 MBits off.
2621 */
2622 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2623 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2624 lq_sta->active_siso_rate &= ~((u16)0x2);
2625 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2626
2627 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2628 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2629 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2630 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2631
2632 if (mvm->cfg->ht_params->ldpc &&
2633 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2634 lq_sta->ldpc = true;
2635
2636 if (mvm->cfg->ht_params->stbc &&
2637 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2638 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2639 lq_sta->stbc_capable = true;
2640
2641 lq_sta->is_vht = false;
2642 }
2643
2644 static void rs_vht_init(struct iwl_mvm *mvm,
2645 struct ieee80211_sta *sta,
2646 struct iwl_lq_sta *lq_sta,
2647 struct ieee80211_sta_vht_cap *vht_cap)
2648 {
2649 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2650
2651 if (mvm->cfg->ht_params->ldpc &&
2652 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2653 lq_sta->ldpc = true;
2654
2655 if (mvm->cfg->ht_params->stbc &&
2656 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2657 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2658 lq_sta->stbc_capable = true;
2659
2660 if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2661 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2662 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2663 lq_sta->bfer_capable = true;
2664
2665 lq_sta->is_vht = true;
2666 }
2667
2668 #ifdef CONFIG_IWLWIFI_DEBUGFS
2669 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2670 {
2671 spin_lock_bh(&mvm->drv_stats_lock);
2672 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2673 spin_unlock_bh(&mvm->drv_stats_lock);
2674 }
2675
2676 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2677 {
2678 u8 nss = 0, mcs = 0;
2679
2680 spin_lock(&mvm->drv_stats_lock);
2681
2682 if (agg)
2683 mvm->drv_rx_stats.agg_frames++;
2684
2685 mvm->drv_rx_stats.success_frames++;
2686
2687 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2688 case RATE_MCS_CHAN_WIDTH_20:
2689 mvm->drv_rx_stats.bw_20_frames++;
2690 break;
2691 case RATE_MCS_CHAN_WIDTH_40:
2692 mvm->drv_rx_stats.bw_40_frames++;
2693 break;
2694 case RATE_MCS_CHAN_WIDTH_80:
2695 mvm->drv_rx_stats.bw_80_frames++;
2696 break;
2697 default:
2698 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2699 }
2700
2701 if (rate & RATE_MCS_HT_MSK) {
2702 mvm->drv_rx_stats.ht_frames++;
2703 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2704 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2705 } else if (rate & RATE_MCS_VHT_MSK) {
2706 mvm->drv_rx_stats.vht_frames++;
2707 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2708 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2709 RATE_VHT_MCS_NSS_POS) + 1;
2710 } else {
2711 mvm->drv_rx_stats.legacy_frames++;
2712 }
2713
2714 if (nss == 1)
2715 mvm->drv_rx_stats.siso_frames++;
2716 else if (nss == 2)
2717 mvm->drv_rx_stats.mimo2_frames++;
2718
2719 if (rate & RATE_MCS_SGI_MSK)
2720 mvm->drv_rx_stats.sgi_frames++;
2721 else
2722 mvm->drv_rx_stats.ngi_frames++;
2723
2724 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2725 mvm->drv_rx_stats.last_frame_idx =
2726 (mvm->drv_rx_stats.last_frame_idx + 1) %
2727 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2728
2729 spin_unlock(&mvm->drv_stats_lock);
2730 }
2731 #endif
2732
2733 /*
2734 * Called after adding a new station to initialize rate scaling
2735 */
2736 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2737 enum ieee80211_band band, bool init)
2738 {
2739 int i, j;
2740 struct ieee80211_hw *hw = mvm->hw;
2741 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2742 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2743 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2744 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2745 struct ieee80211_supported_band *sband;
2746 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2747
2748 /* clear all non-persistent lq data */
2749 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2750
2751 sband = hw->wiphy->bands[band];
2752
2753 lq_sta->lq.sta_id = sta_priv->sta_id;
2754
2755 for (j = 0; j < LQ_SIZE; j++)
2756 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2757
2758 lq_sta->flush_timer = 0;
2759 lq_sta->last_tx = jiffies;
2760
2761 IWL_DEBUG_RATE(mvm,
2762 "LQ: *** rate scale station global init for station %d ***\n",
2763 sta_priv->sta_id);
2764 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2765 * the lowest or the highest rate.. Could consider using RSSI from
2766 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2767 * after assoc.. */
2768
2769 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2770 lq_sta->band = sband->band;
2771 /*
2772 * active legacy rates as per supported rates bitmap
2773 */
2774 supp = sta->supp_rates[sband->band];
2775 lq_sta->active_legacy_rate = 0;
2776 for_each_set_bit(i, &supp, BITS_PER_LONG)
2777 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2778
2779 /* TODO: should probably account for rx_highest for both HT/VHT */
2780 if (!vht_cap || !vht_cap->vht_supported)
2781 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2782 else
2783 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2784
2785 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2786 lq_sta->active_mimo2_rate = 0;
2787
2788 lq_sta->max_legacy_rate_idx =
2789 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2790 lq_sta->max_siso_rate_idx =
2791 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2792 lq_sta->max_mimo2_rate_idx =
2793 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2794
2795 IWL_DEBUG_RATE(mvm,
2796 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2797 lq_sta->active_legacy_rate,
2798 lq_sta->active_siso_rate,
2799 lq_sta->active_mimo2_rate,
2800 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2801 lq_sta->bfer_capable);
2802 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2803 lq_sta->max_legacy_rate_idx,
2804 lq_sta->max_siso_rate_idx,
2805 lq_sta->max_mimo2_rate_idx);
2806
2807 /* These values will be overridden later */
2808 lq_sta->lq.single_stream_ant_msk =
2809 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2810 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2811
2812 /* as default allow aggregation for all tids */
2813 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2814 lq_sta->is_agg = 0;
2815 #ifdef CONFIG_IWLWIFI_DEBUGFS
2816 iwl_mvm_reset_frame_stats(mvm);
2817 #endif
2818 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2819 }
2820
2821 static void rs_rate_update(void *mvm_r,
2822 struct ieee80211_supported_band *sband,
2823 struct cfg80211_chan_def *chandef,
2824 struct ieee80211_sta *sta, void *priv_sta,
2825 u32 changed)
2826 {
2827 u8 tid;
2828 struct iwl_op_mode *op_mode =
2829 (struct iwl_op_mode *)mvm_r;
2830 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2831
2832 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2833 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2834 ieee80211_stop_tx_ba_session(sta, tid);
2835
2836 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2837 }
2838
2839 #ifdef CONFIG_MAC80211_DEBUGFS
2840 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2841 struct iwl_lq_cmd *lq_cmd,
2842 enum ieee80211_band band,
2843 u32 ucode_rate)
2844 {
2845 struct rs_rate rate;
2846 int i;
2847 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2848 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2849 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2850
2851 for (i = 0; i < num_rates; i++)
2852 lq_cmd->rs_table[i] = ucode_rate_le32;
2853
2854 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2855
2856 if (is_mimo(&rate))
2857 lq_cmd->mimo_delim = num_rates - 1;
2858 else
2859 lq_cmd->mimo_delim = 0;
2860
2861 lq_cmd->reduced_tpc = 0;
2862
2863 if (num_of_ant(ant) == 1)
2864 lq_cmd->single_stream_ant_msk = ant;
2865
2866 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2867 }
2868 #endif /* CONFIG_MAC80211_DEBUGFS */
2869
2870 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2871 struct iwl_lq_sta *lq_sta,
2872 struct rs_rate *rate,
2873 __le32 *rs_table, int *rs_table_index,
2874 int num_rates, int num_retries,
2875 u8 valid_tx_ant, bool toggle_ant)
2876 {
2877 int i, j;
2878 __le32 ucode_rate;
2879 bool bottom_reached = false;
2880 int prev_rate_idx = rate->index;
2881 int end = LINK_QUAL_MAX_RETRY_NUM;
2882 int index = *rs_table_index;
2883
2884 for (i = 0; i < num_rates && index < end; i++) {
2885 for (j = 0; j < num_retries && index < end; j++, index++) {
2886 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2887 rate));
2888 rs_table[index] = ucode_rate;
2889 if (toggle_ant)
2890 rs_toggle_antenna(valid_tx_ant, rate);
2891 }
2892
2893 prev_rate_idx = rate->index;
2894 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2895 if (bottom_reached && !is_legacy(rate))
2896 break;
2897 }
2898
2899 if (!bottom_reached && !is_legacy(rate))
2900 rate->index = prev_rate_idx;
2901
2902 *rs_table_index = index;
2903 }
2904
2905 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2906 * column the rate table should look like this:
2907 *
2908 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2909 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2910 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2911 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2912 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2913 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2914 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2915 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2916 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2917 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2918 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2919 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2920 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2921 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2922 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2923 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2924 */
2925 static void rs_build_rates_table(struct iwl_mvm *mvm,
2926 struct ieee80211_sta *sta,
2927 struct iwl_lq_sta *lq_sta,
2928 const struct rs_rate *initial_rate)
2929 {
2930 struct rs_rate rate;
2931 int num_rates, num_retries, index = 0;
2932 u8 valid_tx_ant = 0;
2933 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2934 bool toggle_ant = false;
2935
2936 memcpy(&rate, initial_rate, sizeof(rate));
2937
2938 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2939
2940 /* TODO: remove old API when min FW API hits 14 */
2941 if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
2942 rs_stbc_allow(mvm, sta, lq_sta))
2943 rate.stbc = true;
2944
2945 if (is_siso(&rate)) {
2946 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2947 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2948 } else if (is_mimo(&rate)) {
2949 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2950 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2951 } else {
2952 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
2953 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
2954 toggle_ant = true;
2955 }
2956
2957 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2958 num_rates, num_retries, valid_tx_ant,
2959 toggle_ant);
2960
2961 rs_get_lower_rate_down_column(lq_sta, &rate);
2962
2963 if (is_siso(&rate)) {
2964 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2965 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
2966 lq_cmd->mimo_delim = index;
2967 } else if (is_legacy(&rate)) {
2968 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2969 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2970 } else {
2971 WARN_ON_ONCE(1);
2972 }
2973
2974 toggle_ant = true;
2975
2976 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2977 num_rates, num_retries, valid_tx_ant,
2978 toggle_ant);
2979
2980 rs_get_lower_rate_down_column(lq_sta, &rate);
2981
2982 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2983 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2984
2985 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2986 num_rates, num_retries, valid_tx_ant,
2987 toggle_ant);
2988
2989 }
2990
2991 struct rs_bfer_active_iter_data {
2992 struct ieee80211_sta *exclude_sta;
2993 struct iwl_mvm_sta *bfer_mvmsta;
2994 };
2995
2996 static void rs_bfer_active_iter(void *_data,
2997 struct ieee80211_sta *sta)
2998 {
2999 struct rs_bfer_active_iter_data *data = _data;
3000 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3001 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3002 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3003
3004 if (sta == data->exclude_sta)
3005 return;
3006
3007 /* The current sta has BFER allowed */
3008 if (ss_params & LQ_SS_BFER_ALLOWED) {
3009 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3010
3011 data->bfer_mvmsta = mvmsta;
3012 }
3013 }
3014
3015 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3016 {
3017 int prio = -1;
3018 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3019
3020 switch (viftype) {
3021 case NL80211_IFTYPE_AP:
3022 case NL80211_IFTYPE_P2P_GO:
3023 prio = 3;
3024 break;
3025 case NL80211_IFTYPE_P2P_CLIENT:
3026 prio = 2;
3027 break;
3028 case NL80211_IFTYPE_STATION:
3029 prio = 1;
3030 break;
3031 default:
3032 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3033 prio = -1;
3034 }
3035
3036 return prio;
3037 }
3038
3039 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3040 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3041 struct iwl_mvm_sta *sta2)
3042 {
3043 int prio1 = rs_bfer_priority(sta1);
3044 int prio2 = rs_bfer_priority(sta2);
3045
3046 if (prio1 > prio2)
3047 return 1;
3048 if (prio1 < prio2)
3049 return -1;
3050 return 0;
3051 }
3052
3053 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3054 struct ieee80211_sta *sta,
3055 struct iwl_lq_sta *lq_sta,
3056 const struct rs_rate *initial_rate)
3057 {
3058 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3059 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3060 struct rs_bfer_active_iter_data data = {
3061 .exclude_sta = sta,
3062 .bfer_mvmsta = NULL,
3063 };
3064 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3065 u32 ss_params = LQ_SS_PARAMS_VALID;
3066
3067 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3068 goto out;
3069
3070 /* Check if forcing the decision is configured.
3071 * Note that SISO is forced by not allowing STBC or BFER
3072 */
3073 if (lq_sta->ss_force == RS_SS_FORCE_STBC)
3074 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3075 else if (lq_sta->ss_force == RS_SS_FORCE_BFER)
3076 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3077
3078 if (lq_sta->ss_force != RS_SS_FORCE_NONE) {
3079 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3080 lq_sta->ss_force);
3081 goto out;
3082 }
3083
3084 if (lq_sta->stbc_capable)
3085 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3086
3087 if (!lq_sta->bfer_capable)
3088 goto out;
3089
3090 ieee80211_iterate_stations_atomic(mvm->hw,
3091 rs_bfer_active_iter,
3092 &data);
3093 bfer_mvmsta = data.bfer_mvmsta;
3094
3095 /* This code is safe as it doesn't run concurrently for different
3096 * stations. This is guaranteed by the fact that calls to
3097 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3098 */
3099 if (!bfer_mvmsta) {
3100 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3101
3102 ss_params |= LQ_SS_BFER_ALLOWED;
3103 goto out;
3104 }
3105
3106 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3107 bfer_mvmsta->sta_id);
3108
3109 /* Disallow BFER on another STA if active and we're a higher priority */
3110 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3111 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3112 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3113
3114 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3115 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3116 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3117
3118 ss_params |= LQ_SS_BFER_ALLOWED;
3119 IWL_DEBUG_RATE(mvm,
3120 "Lower priority BFER sta found (%d). Switch BFER\n",
3121 bfer_mvmsta->sta_id);
3122 }
3123 out:
3124 lq_cmd->ss_params = cpu_to_le32(ss_params);
3125 }
3126
3127 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3128 struct ieee80211_sta *sta,
3129 struct iwl_lq_sta *lq_sta,
3130 const struct rs_rate *initial_rate)
3131 {
3132 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3133 struct iwl_mvm_sta *mvmsta;
3134 struct iwl_mvm_vif *mvmvif;
3135
3136 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3137 lq_cmd->agg_time_limit =
3138 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3139
3140 #ifdef CONFIG_MAC80211_DEBUGFS
3141 if (lq_sta->pers.dbg_fixed_rate) {
3142 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3143 lq_sta->band,
3144 lq_sta->pers.dbg_fixed_rate);
3145 return;
3146 }
3147 #endif
3148 if (WARN_ON_ONCE(!sta || !initial_rate))
3149 return;
3150
3151 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3152
3153 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3154 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3155
3156 if (num_of_ant(initial_rate->ant) == 1)
3157 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3158
3159 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3160 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3161
3162 if (num_of_ant(initial_rate->ant) == 1)
3163 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3164
3165 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3166
3167 /*
3168 * In case of low latency, tell the firwmare to leave a frame in the
3169 * Tx Fifo so that it can start a transaction in the same TxOP. This
3170 * basically allows the firmware to send bursts.
3171 */
3172 if (iwl_mvm_vif_low_latency(mvmvif)) {
3173 lq_cmd->agg_frame_cnt_limit--;
3174
3175 if (mvm->low_latency_agg_frame_limit)
3176 lq_cmd->agg_frame_cnt_limit =
3177 min(lq_cmd->agg_frame_cnt_limit,
3178 mvm->low_latency_agg_frame_limit);
3179 }
3180
3181 if (mvmsta->vif->p2p)
3182 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3183
3184 lq_cmd->agg_time_limit =
3185 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3186 }
3187
3188 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3189 {
3190 return hw->priv;
3191 }
3192 /* rate scale requires free function to be implemented */
3193 static void rs_free(void *mvm_rate)
3194 {
3195 return;
3196 }
3197
3198 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3199 void *mvm_sta)
3200 {
3201 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3202 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3203
3204 IWL_DEBUG_RATE(mvm, "enter\n");
3205 IWL_DEBUG_RATE(mvm, "leave\n");
3206 }
3207
3208 #ifdef CONFIG_MAC80211_DEBUGFS
3209 int rs_pretty_print_rate(char *buf, const u32 rate)
3210 {
3211
3212 char *type, *bw;
3213 u8 mcs = 0, nss = 0;
3214 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3215
3216 if (!(rate & RATE_MCS_HT_MSK) &&
3217 !(rate & RATE_MCS_VHT_MSK)) {
3218 int index = iwl_hwrate_to_plcp_idx(rate);
3219
3220 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3221 rs_pretty_ant(ant),
3222 index == IWL_RATE_INVALID ? "BAD" :
3223 iwl_rate_mcs[index].mbps);
3224 }
3225
3226 if (rate & RATE_MCS_VHT_MSK) {
3227 type = "VHT";
3228 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3229 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3230 >> RATE_VHT_MCS_NSS_POS) + 1;
3231 } else if (rate & RATE_MCS_HT_MSK) {
3232 type = "HT";
3233 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3234 } else {
3235 type = "Unknown"; /* shouldn't happen */
3236 }
3237
3238 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3239 case RATE_MCS_CHAN_WIDTH_20:
3240 bw = "20Mhz";
3241 break;
3242 case RATE_MCS_CHAN_WIDTH_40:
3243 bw = "40Mhz";
3244 break;
3245 case RATE_MCS_CHAN_WIDTH_80:
3246 bw = "80Mhz";
3247 break;
3248 case RATE_MCS_CHAN_WIDTH_160:
3249 bw = "160Mhz";
3250 break;
3251 default:
3252 bw = "BAD BW";
3253 }
3254
3255 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3256 type, rs_pretty_ant(ant), bw, mcs, nss,
3257 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3258 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3259 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3260 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3261 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3262 }
3263
3264 /**
3265 * Program the device to use fixed rate for frame transmit
3266 * This is for debugging/testing only
3267 * once the device start use fixed rate, we need to reload the module
3268 * to being back the normal operation.
3269 */
3270 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3271 struct iwl_lq_sta *lq_sta)
3272 {
3273 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3274 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3275 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3276
3277 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3278 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3279
3280 if (lq_sta->pers.dbg_fixed_rate) {
3281 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3282 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3283 }
3284 }
3285
3286 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3287 const char __user *user_buf, size_t count, loff_t *ppos)
3288 {
3289 struct iwl_lq_sta *lq_sta = file->private_data;
3290 struct iwl_mvm *mvm;
3291 char buf[64];
3292 size_t buf_size;
3293 u32 parsed_rate;
3294
3295 mvm = lq_sta->pers.drv;
3296 memset(buf, 0, sizeof(buf));
3297 buf_size = min(count, sizeof(buf) - 1);
3298 if (copy_from_user(buf, user_buf, buf_size))
3299 return -EFAULT;
3300
3301 if (sscanf(buf, "%x", &parsed_rate) == 1)
3302 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3303 else
3304 lq_sta->pers.dbg_fixed_rate = 0;
3305
3306 rs_program_fix_rate(mvm, lq_sta);
3307
3308 return count;
3309 }
3310
3311 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3312 char __user *user_buf, size_t count, loff_t *ppos)
3313 {
3314 char *buff;
3315 int desc = 0;
3316 int i = 0;
3317 ssize_t ret;
3318
3319 struct iwl_lq_sta *lq_sta = file->private_data;
3320 struct iwl_mvm *mvm;
3321 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3322 struct rs_rate *rate = &tbl->rate;
3323 mvm = lq_sta->pers.drv;
3324 buff = kmalloc(2048, GFP_KERNEL);
3325 if (!buff)
3326 return -ENOMEM;
3327
3328 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3329 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3330 lq_sta->total_failed, lq_sta->total_success,
3331 lq_sta->active_legacy_rate);
3332 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3333 lq_sta->pers.dbg_fixed_rate);
3334 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3335 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3336 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3337 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3338 desc += sprintf(buff+desc, "lq type %s\n",
3339 (is_legacy(rate)) ? "legacy" :
3340 is_vht(rate) ? "VHT" : "HT");
3341 if (!is_legacy(rate)) {
3342 desc += sprintf(buff+desc, " %s",
3343 (is_siso(rate)) ? "SISO" : "MIMO2");
3344 desc += sprintf(buff+desc, " %s",
3345 (is_ht20(rate)) ? "20MHz" :
3346 (is_ht40(rate)) ? "40MHz" :
3347 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3348 desc += sprintf(buff+desc, " %s %s %s\n",
3349 (rate->sgi) ? "SGI" : "NGI",
3350 (rate->ldpc) ? "LDPC" : "BCC",
3351 (lq_sta->is_agg) ? "AGG on" : "");
3352 }
3353 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3354 lq_sta->last_rate_n_flags);
3355 desc += sprintf(buff+desc,
3356 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3357 lq_sta->lq.flags,
3358 lq_sta->lq.mimo_delim,
3359 lq_sta->lq.single_stream_ant_msk,
3360 lq_sta->lq.dual_stream_ant_msk);
3361
3362 desc += sprintf(buff+desc,
3363 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3364 le16_to_cpu(lq_sta->lq.agg_time_limit),
3365 lq_sta->lq.agg_disable_start_th,
3366 lq_sta->lq.agg_frame_cnt_limit);
3367
3368 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3369 desc += sprintf(buff+desc,
3370 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3371 lq_sta->lq.initial_rate_index[0],
3372 lq_sta->lq.initial_rate_index[1],
3373 lq_sta->lq.initial_rate_index[2],
3374 lq_sta->lq.initial_rate_index[3]);
3375
3376 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3377 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3378
3379 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3380 desc += rs_pretty_print_rate(buff+desc, r);
3381 }
3382
3383 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3384 kfree(buff);
3385 return ret;
3386 }
3387
3388 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3389 .write = rs_sta_dbgfs_scale_table_write,
3390 .read = rs_sta_dbgfs_scale_table_read,
3391 .open = simple_open,
3392 .llseek = default_llseek,
3393 };
3394 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3395 char __user *user_buf, size_t count, loff_t *ppos)
3396 {
3397 char *buff;
3398 int desc = 0;
3399 int i, j;
3400 ssize_t ret;
3401 struct iwl_scale_tbl_info *tbl;
3402 struct rs_rate *rate;
3403 struct iwl_lq_sta *lq_sta = file->private_data;
3404
3405 buff = kmalloc(1024, GFP_KERNEL);
3406 if (!buff)
3407 return -ENOMEM;
3408
3409 for (i = 0; i < LQ_SIZE; i++) {
3410 tbl = &(lq_sta->lq_info[i]);
3411 rate = &tbl->rate;
3412 desc += sprintf(buff+desc,
3413 "%s type=%d SGI=%d BW=%s DUP=0\n"
3414 "index=%d\n",
3415 lq_sta->active_tbl == i ? "*" : "x",
3416 rate->type,
3417 rate->sgi,
3418 is_ht20(rate) ? "20Mhz" :
3419 is_ht40(rate) ? "40Mhz" :
3420 is_ht80(rate) ? "80Mhz" : "ERR",
3421 rate->index);
3422 for (j = 0; j < IWL_RATE_COUNT; j++) {
3423 desc += sprintf(buff+desc,
3424 "counter=%d success=%d %%=%d\n",
3425 tbl->win[j].counter,
3426 tbl->win[j].success_counter,
3427 tbl->win[j].success_ratio);
3428 }
3429 }
3430 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3431 kfree(buff);
3432 return ret;
3433 }
3434
3435 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3436 .read = rs_sta_dbgfs_stats_table_read,
3437 .open = simple_open,
3438 .llseek = default_llseek,
3439 };
3440
3441 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3442 char __user *user_buf,
3443 size_t count, loff_t *ppos)
3444 {
3445 static const char * const column_name[] = {
3446 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3447 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3448 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3449 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3450 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3451 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3452 [RS_COLUMN_MIMO2] = "MIMO2",
3453 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3454 };
3455
3456 static const char * const rate_name[] = {
3457 [IWL_RATE_1M_INDEX] = "1M",
3458 [IWL_RATE_2M_INDEX] = "2M",
3459 [IWL_RATE_5M_INDEX] = "5.5M",
3460 [IWL_RATE_11M_INDEX] = "11M",
3461 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3462 [IWL_RATE_9M_INDEX] = "9M",
3463 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3464 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3465 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3466 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3467 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3468 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3469 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3470 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3471 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3472 };
3473
3474 char *buff, *pos, *endpos;
3475 int col, rate;
3476 ssize_t ret;
3477 struct iwl_lq_sta *lq_sta = file->private_data;
3478 struct rs_rate_stats *stats;
3479 static const size_t bufsz = 1024;
3480
3481 buff = kmalloc(bufsz, GFP_KERNEL);
3482 if (!buff)
3483 return -ENOMEM;
3484
3485 pos = buff;
3486 endpos = pos + bufsz;
3487
3488 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3489 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3490 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3491 pos += scnprintf(pos, endpos - pos, "\n");
3492
3493 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3494 pos += scnprintf(pos, endpos - pos,
3495 "%s,", column_name[col]);
3496
3497 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3498 stats = &(lq_sta->pers.tx_stats[col][rate]);
3499 pos += scnprintf(pos, endpos - pos,
3500 "%llu/%llu,",
3501 stats->success,
3502 stats->total);
3503 }
3504 pos += scnprintf(pos, endpos - pos, "\n");
3505 }
3506
3507 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3508 kfree(buff);
3509 return ret;
3510 }
3511
3512 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3513 const char __user *user_buf,
3514 size_t count, loff_t *ppos)
3515 {
3516 struct iwl_lq_sta *lq_sta = file->private_data;
3517 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3518
3519 return count;
3520 }
3521
3522 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3523 .read = rs_sta_dbgfs_drv_tx_stats_read,
3524 .write = rs_sta_dbgfs_drv_tx_stats_write,
3525 .open = simple_open,
3526 .llseek = default_llseek,
3527 };
3528
3529 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3530 char __user *user_buf,
3531 size_t count, loff_t *ppos)
3532 {
3533 struct iwl_lq_sta *lq_sta = file->private_data;
3534 char buf[12];
3535 int bufsz = sizeof(buf);
3536 int pos = 0;
3537 static const char * const ss_force_name[] = {
3538 [RS_SS_FORCE_NONE] = "none",
3539 [RS_SS_FORCE_STBC] = "stbc",
3540 [RS_SS_FORCE_BFER] = "bfer",
3541 [RS_SS_FORCE_SISO] = "siso",
3542 };
3543
3544 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3545 ss_force_name[lq_sta->ss_force]);
3546 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3547 }
3548
3549 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3550 size_t count, loff_t *ppos)
3551 {
3552 struct iwl_mvm *mvm = lq_sta->pers.drv;
3553 int ret = 0;
3554
3555 if (!strncmp("none", buf, 4)) {
3556 lq_sta->ss_force = RS_SS_FORCE_NONE;
3557 } else if (!strncmp("siso", buf, 4)) {
3558 lq_sta->ss_force = RS_SS_FORCE_SISO;
3559 } else if (!strncmp("stbc", buf, 4)) {
3560 if (lq_sta->stbc_capable) {
3561 lq_sta->ss_force = RS_SS_FORCE_STBC;
3562 } else {
3563 IWL_ERR(mvm,
3564 "can't force STBC. peer doesn't support\n");
3565 ret = -EINVAL;
3566 }
3567 } else if (!strncmp("bfer", buf, 4)) {
3568 if (lq_sta->bfer_capable) {
3569 lq_sta->ss_force = RS_SS_FORCE_BFER;
3570 } else {
3571 IWL_ERR(mvm,
3572 "can't force BFER. peer doesn't support\n");
3573 ret = -EINVAL;
3574 }
3575 } else {
3576 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3577 ret = -EINVAL;
3578 }
3579 return ret ?: count;
3580 }
3581
3582 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3583 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3584 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3585 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3586 &iwl_dbgfs_##name##_ops)) \
3587 goto err; \
3588 } while (0)
3589
3590 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3591
3592 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3593 {
3594 struct iwl_lq_sta *lq_sta = mvm_sta;
3595
3596 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3597 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3598 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3599 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3600 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3601 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3602 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3603 &lq_sta->tx_agg_tid_en);
3604 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3605 &lq_sta->pers.dbg_fixed_txp_reduction);
3606
3607 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3608 return;
3609 err:
3610 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3611 }
3612
3613 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3614 {
3615 }
3616 #endif
3617
3618 /*
3619 * Initialization of rate scaling information is done by driver after
3620 * the station is added. Since mac80211 calls this function before a
3621 * station is added we ignore it.
3622 */
3623 static void rs_rate_init_stub(void *mvm_r,
3624 struct ieee80211_supported_band *sband,
3625 struct cfg80211_chan_def *chandef,
3626 struct ieee80211_sta *sta, void *mvm_sta)
3627 {
3628 }
3629
3630 static const struct rate_control_ops rs_mvm_ops = {
3631 .name = RS_NAME,
3632 .tx_status = rs_mac80211_tx_status,
3633 .get_rate = rs_get_rate,
3634 .rate_init = rs_rate_init_stub,
3635 .alloc = rs_alloc,
3636 .free = rs_free,
3637 .alloc_sta = rs_alloc_sta,
3638 .free_sta = rs_free_sta,
3639 .rate_update = rs_rate_update,
3640 #ifdef CONFIG_MAC80211_DEBUGFS
3641 .add_sta_debugfs = rs_add_debugfs,
3642 .remove_sta_debugfs = rs_remove_debugfs,
3643 #endif
3644 };
3645
3646 int iwl_mvm_rate_control_register(void)
3647 {
3648 return ieee80211_rate_control_register(&rs_mvm_ops);
3649 }
3650
3651 void iwl_mvm_rate_control_unregister(void)
3652 {
3653 ieee80211_rate_control_unregister(&rs_mvm_ops);
3654 }
3655
3656 /**
3657 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3658 * Tx protection, according to this rquest and previous requests,
3659 * and send the LQ command.
3660 * @mvmsta: The station
3661 * @enable: Enable Tx protection?
3662 */
3663 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3664 bool enable)
3665 {
3666 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3667
3668 lockdep_assert_held(&mvm->mutex);
3669
3670 if (enable) {
3671 if (mvmsta->tx_protection == 0)
3672 lq->flags |= LQ_FLAG_USE_RTS_MSK;
3673 mvmsta->tx_protection++;
3674 } else {
3675 mvmsta->tx_protection--;
3676 if (mvmsta->tx_protection == 0)
3677 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3678 }
3679
3680 return iwl_mvm_send_lq_cmd(mvm, lq, false);
3681 }
Linux kernel - Deliverables
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