1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *
4 * Copyright(c) 2005 - 2014, 2018 - 2020 Intel Corporation. All rights reserved.
5 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
6 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
7 *
8 * Contact Information:
9 * Intel Linux Wireless <linuxwifi@intel.com>
10 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
11 *
12 *****************************************************************************/
13 #include <linux/kernel.h>
14 #include <linux/skbuff.h>
15 #include <linux/slab.h>
16 #include <net/mac80211.h>
17
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/delay.h>
21
22 #include <linux/workqueue.h>
23 #include "rs.h"
24 #include "fw-api.h"
25 #include "sta.h"
26 #include "iwl-op-mode.h"
27 #include "mvm.h"
28 #include "debugfs.h"
29
30 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
31
32 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
33 * Use this macro when dealing with thresholds consts set as a percentage
34 */
35 #define RS_PERCENT(x) (128 * x)
36
37 static u8 rs_ht_to_legacy[] = {
38 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
39 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
40 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
41 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
42 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
43 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
44 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
45 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
46 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
47 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
48 };
49
50 static const u8 ant_toggle_lookup[] = {
51 [ANT_NONE] = ANT_NONE,
52 [ANT_A] = ANT_B,
53 [ANT_B] = ANT_A,
54 [ANT_AB] = ANT_AB,
55 };
56
57 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
58 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
59 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
60 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
61 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
62 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
63 IWL_RATE_##rp##M_INDEX, \
64 IWL_RATE_##rn##M_INDEX }
65
66 #define IWL_DECLARE_MCS_RATE(s) \
67 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
68 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
69 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
70 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
71 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
72 IWL_RATE_INVM_INDEX, \
73 IWL_RATE_INVM_INDEX }
74
75 /*
76 * Parameter order:
77 * rate, ht rate, prev rate, next rate
78 *
79 * If there isn't a valid next or previous rate then INV is used which
80 * maps to IWL_RATE_INVALID
81 *
82 */
83 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
84 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
85 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
86 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
87 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
88 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
89 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
90 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
91 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
92 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
93 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
94 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
95 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
96 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
97 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
98 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
99 };
100
101 enum rs_action {
102 RS_ACTION_STAY = 0,
103 RS_ACTION_DOWNSCALE = -1,
104 RS_ACTION_UPSCALE = 1,
105 };
106
107 enum rs_column_mode {
108 RS_INVALID = 0,
109 RS_LEGACY,
110 RS_SISO,
111 RS_MIMO2,
112 };
113
114 #define MAX_NEXT_COLUMNS 7
115 #define MAX_COLUMN_CHECKS 3
116
117 struct rs_tx_column;
118
119 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
120 struct ieee80211_sta *sta,
121 struct rs_rate *rate,
122 const struct rs_tx_column *next_col);
123
124 struct rs_tx_column {
125 enum rs_column_mode mode;
126 u8 ant;
127 bool sgi;
128 enum rs_column next_columns[MAX_NEXT_COLUMNS];
129 allow_column_func_t checks[MAX_COLUMN_CHECKS];
130 };
131
rs_ant_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)132 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
133 struct rs_rate *rate,
134 const struct rs_tx_column *next_col)
135 {
136 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
137 }
138
rs_mimo_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)139 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
140 struct rs_rate *rate,
141 const struct rs_tx_column *next_col)
142 {
143 if (!sta->ht_cap.ht_supported)
144 return false;
145
146 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
147 return false;
148
149 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
150 return false;
151
152 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
153 return false;
154
155 if (mvm->nvm_data->sku_cap_mimo_disabled)
156 return false;
157
158 return true;
159 }
160
rs_siso_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)161 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
162 struct rs_rate *rate,
163 const struct rs_tx_column *next_col)
164 {
165 if (!sta->ht_cap.ht_supported)
166 return false;
167
168 return true;
169 }
170
rs_sgi_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)171 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
172 struct rs_rate *rate,
173 const struct rs_tx_column *next_col)
174 {
175 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
176 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
177
178 if (is_ht20(rate) && (ht_cap->cap &
179 IEEE80211_HT_CAP_SGI_20))
180 return true;
181 if (is_ht40(rate) && (ht_cap->cap &
182 IEEE80211_HT_CAP_SGI_40))
183 return true;
184 if (is_ht80(rate) && (vht_cap->cap &
185 IEEE80211_VHT_CAP_SHORT_GI_80))
186 return true;
187 if (is_ht160(rate) && (vht_cap->cap &
188 IEEE80211_VHT_CAP_SHORT_GI_160))
189 return true;
190
191 return false;
192 }
193
194 static const struct rs_tx_column rs_tx_columns[] = {
195 [RS_COLUMN_LEGACY_ANT_A] = {
196 .mode = RS_LEGACY,
197 .ant = ANT_A,
198 .next_columns = {
199 RS_COLUMN_LEGACY_ANT_B,
200 RS_COLUMN_SISO_ANT_A,
201 RS_COLUMN_MIMO2,
202 RS_COLUMN_INVALID,
203 RS_COLUMN_INVALID,
204 RS_COLUMN_INVALID,
205 RS_COLUMN_INVALID,
206 },
207 .checks = {
208 rs_ant_allow,
209 },
210 },
211 [RS_COLUMN_LEGACY_ANT_B] = {
212 .mode = RS_LEGACY,
213 .ant = ANT_B,
214 .next_columns = {
215 RS_COLUMN_LEGACY_ANT_A,
216 RS_COLUMN_SISO_ANT_B,
217 RS_COLUMN_MIMO2,
218 RS_COLUMN_INVALID,
219 RS_COLUMN_INVALID,
220 RS_COLUMN_INVALID,
221 RS_COLUMN_INVALID,
222 },
223 .checks = {
224 rs_ant_allow,
225 },
226 },
227 [RS_COLUMN_SISO_ANT_A] = {
228 .mode = RS_SISO,
229 .ant = ANT_A,
230 .next_columns = {
231 RS_COLUMN_SISO_ANT_B,
232 RS_COLUMN_MIMO2,
233 RS_COLUMN_SISO_ANT_A_SGI,
234 RS_COLUMN_LEGACY_ANT_A,
235 RS_COLUMN_LEGACY_ANT_B,
236 RS_COLUMN_INVALID,
237 RS_COLUMN_INVALID,
238 },
239 .checks = {
240 rs_siso_allow,
241 rs_ant_allow,
242 },
243 },
244 [RS_COLUMN_SISO_ANT_B] = {
245 .mode = RS_SISO,
246 .ant = ANT_B,
247 .next_columns = {
248 RS_COLUMN_SISO_ANT_A,
249 RS_COLUMN_MIMO2,
250 RS_COLUMN_SISO_ANT_B_SGI,
251 RS_COLUMN_LEGACY_ANT_A,
252 RS_COLUMN_LEGACY_ANT_B,
253 RS_COLUMN_INVALID,
254 RS_COLUMN_INVALID,
255 },
256 .checks = {
257 rs_siso_allow,
258 rs_ant_allow,
259 },
260 },
261 [RS_COLUMN_SISO_ANT_A_SGI] = {
262 .mode = RS_SISO,
263 .ant = ANT_A,
264 .sgi = true,
265 .next_columns = {
266 RS_COLUMN_SISO_ANT_B_SGI,
267 RS_COLUMN_MIMO2_SGI,
268 RS_COLUMN_SISO_ANT_A,
269 RS_COLUMN_LEGACY_ANT_A,
270 RS_COLUMN_LEGACY_ANT_B,
271 RS_COLUMN_INVALID,
272 RS_COLUMN_INVALID,
273 },
274 .checks = {
275 rs_siso_allow,
276 rs_ant_allow,
277 rs_sgi_allow,
278 },
279 },
280 [RS_COLUMN_SISO_ANT_B_SGI] = {
281 .mode = RS_SISO,
282 .ant = ANT_B,
283 .sgi = true,
284 .next_columns = {
285 RS_COLUMN_SISO_ANT_A_SGI,
286 RS_COLUMN_MIMO2_SGI,
287 RS_COLUMN_SISO_ANT_B,
288 RS_COLUMN_LEGACY_ANT_A,
289 RS_COLUMN_LEGACY_ANT_B,
290 RS_COLUMN_INVALID,
291 RS_COLUMN_INVALID,
292 },
293 .checks = {
294 rs_siso_allow,
295 rs_ant_allow,
296 rs_sgi_allow,
297 },
298 },
299 [RS_COLUMN_MIMO2] = {
300 .mode = RS_MIMO2,
301 .ant = ANT_AB,
302 .next_columns = {
303 RS_COLUMN_SISO_ANT_A,
304 RS_COLUMN_MIMO2_SGI,
305 RS_COLUMN_LEGACY_ANT_A,
306 RS_COLUMN_LEGACY_ANT_B,
307 RS_COLUMN_INVALID,
308 RS_COLUMN_INVALID,
309 RS_COLUMN_INVALID,
310 },
311 .checks = {
312 rs_mimo_allow,
313 },
314 },
315 [RS_COLUMN_MIMO2_SGI] = {
316 .mode = RS_MIMO2,
317 .ant = ANT_AB,
318 .sgi = true,
319 .next_columns = {
320 RS_COLUMN_SISO_ANT_A_SGI,
321 RS_COLUMN_MIMO2,
322 RS_COLUMN_LEGACY_ANT_A,
323 RS_COLUMN_LEGACY_ANT_B,
324 RS_COLUMN_INVALID,
325 RS_COLUMN_INVALID,
326 RS_COLUMN_INVALID,
327 },
328 .checks = {
329 rs_mimo_allow,
330 rs_sgi_allow,
331 },
332 },
333 };
334
rs_extract_rate(u32 rate_n_flags)335 static inline u8 rs_extract_rate(u32 rate_n_flags)
336 {
337 /* also works for HT because bits 7:6 are zero there */
338 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
339 }
340
iwl_hwrate_to_plcp_idx(u32 rate_n_flags)341 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
342 {
343 int idx = 0;
344
345 if (rate_n_flags & RATE_MCS_HT_MSK) {
346 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
347 idx += IWL_RATE_MCS_0_INDEX;
348
349 /* skip 9M not supported in HT*/
350 if (idx >= IWL_RATE_9M_INDEX)
351 idx += 1;
352 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
353 return idx;
354 } else if (rate_n_flags & RATE_MCS_VHT_MSK ||
355 rate_n_flags & RATE_MCS_HE_MSK) {
356 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
357 idx += IWL_RATE_MCS_0_INDEX;
358
359 /* skip 9M not supported in VHT*/
360 if (idx >= IWL_RATE_9M_INDEX)
361 idx++;
362 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
363 return idx;
364 if ((rate_n_flags & RATE_MCS_HE_MSK) &&
365 (idx <= IWL_LAST_HE_RATE))
366 return idx;
367 } else {
368 /* legacy rate format, search for match in table */
369
370 u8 legacy_rate = rs_extract_rate(rate_n_flags);
371 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
372 if (iwl_rates[idx].plcp == legacy_rate)
373 return idx;
374 }
375
376 return IWL_RATE_INVALID;
377 }
378
379 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
380 struct ieee80211_sta *sta,
381 struct iwl_lq_sta *lq_sta,
382 int tid, bool ndp);
383 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
384 struct ieee80211_sta *sta,
385 struct iwl_lq_sta *lq_sta,
386 const struct rs_rate *initial_rate);
387 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
388
389 /**
390 * The following tables contain the expected throughput metrics for all rates
391 *
392 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
393 *
394 * where invalid entries are zeros.
395 *
396 * CCK rates are only valid in legacy table and will only be used in G
397 * (2.4 GHz) band.
398 */
399
400 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
401 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
402 };
403
404 /* Expected TpT tables. 4 indexes:
405 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
406 */
407 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
408 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
409 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
410 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
411 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
412 };
413
414 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
415 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
416 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
417 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
418 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
419 };
420
421 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
422 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
423 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
424 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
425 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
426 };
427
428 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
429 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
430 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
431 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
432 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
433 };
434
435 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
436 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
437 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
438 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
439 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
440 };
441
442 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
443 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
444 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
445 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
446 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
447 };
448
449 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
450 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
451 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
452 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
453 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
454 };
455
456 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
457 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
458 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
459 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
460 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
461 };
462
463 /* mbps, mcs */
464 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
465 { "1", "BPSK DSSS"},
466 { "2", "QPSK DSSS"},
467 {"5.5", "BPSK CCK"},
468 { "11", "QPSK CCK"},
469 { "6", "BPSK 1/2"},
470 { "9", "BPSK 1/2"},
471 { "12", "QPSK 1/2"},
472 { "18", "QPSK 3/4"},
473 { "24", "16QAM 1/2"},
474 { "36", "16QAM 3/4"},
475 { "48", "64QAM 2/3"},
476 { "54", "64QAM 3/4"},
477 { "60", "64QAM 5/6"},
478 };
479
480 #define MCS_INDEX_PER_STREAM (8)
481
rs_pretty_ant(u8 ant)482 static const char *rs_pretty_ant(u8 ant)
483 {
484 static const char * const ant_name[] = {
485 [ANT_NONE] = "None",
486 [ANT_A] = "A",
487 [ANT_B] = "B",
488 [ANT_AB] = "AB",
489 [ANT_C] = "C",
490 [ANT_AC] = "AC",
491 [ANT_BC] = "BC",
492 [ANT_ABC] = "ABC",
493 };
494
495 if (ant > ANT_ABC)
496 return "UNKNOWN";
497
498 return ant_name[ant];
499 }
500
rs_pretty_lq_type(enum iwl_table_type type)501 static const char *rs_pretty_lq_type(enum iwl_table_type type)
502 {
503 static const char * const lq_types[] = {
504 [LQ_NONE] = "NONE",
505 [LQ_LEGACY_A] = "LEGACY_A",
506 [LQ_LEGACY_G] = "LEGACY_G",
507 [LQ_HT_SISO] = "HT SISO",
508 [LQ_HT_MIMO2] = "HT MIMO",
509 [LQ_VHT_SISO] = "VHT SISO",
510 [LQ_VHT_MIMO2] = "VHT MIMO",
511 [LQ_HE_SISO] = "HE SISO",
512 [LQ_HE_MIMO2] = "HE MIMO",
513 };
514
515 if (type < LQ_NONE || type >= LQ_MAX)
516 return "UNKNOWN";
517
518 return lq_types[type];
519 }
520
rs_pretty_rate(const struct rs_rate * rate)521 static char *rs_pretty_rate(const struct rs_rate *rate)
522 {
523 static char buf[40];
524 static const char * const legacy_rates[] = {
525 [IWL_RATE_1M_INDEX] = "1M",
526 [IWL_RATE_2M_INDEX] = "2M",
527 [IWL_RATE_5M_INDEX] = "5.5M",
528 [IWL_RATE_11M_INDEX] = "11M",
529 [IWL_RATE_6M_INDEX] = "6M",
530 [IWL_RATE_9M_INDEX] = "9M",
531 [IWL_RATE_12M_INDEX] = "12M",
532 [IWL_RATE_18M_INDEX] = "18M",
533 [IWL_RATE_24M_INDEX] = "24M",
534 [IWL_RATE_36M_INDEX] = "36M",
535 [IWL_RATE_48M_INDEX] = "48M",
536 [IWL_RATE_54M_INDEX] = "54M",
537 };
538 static const char *const ht_vht_rates[] = {
539 [IWL_RATE_MCS_0_INDEX] = "MCS0",
540 [IWL_RATE_MCS_1_INDEX] = "MCS1",
541 [IWL_RATE_MCS_2_INDEX] = "MCS2",
542 [IWL_RATE_MCS_3_INDEX] = "MCS3",
543 [IWL_RATE_MCS_4_INDEX] = "MCS4",
544 [IWL_RATE_MCS_5_INDEX] = "MCS5",
545 [IWL_RATE_MCS_6_INDEX] = "MCS6",
546 [IWL_RATE_MCS_7_INDEX] = "MCS7",
547 [IWL_RATE_MCS_8_INDEX] = "MCS8",
548 [IWL_RATE_MCS_9_INDEX] = "MCS9",
549 };
550 const char *rate_str;
551
552 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
553 rate_str = legacy_rates[rate->index];
554 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
555 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
556 (rate->index <= IWL_RATE_MCS_9_INDEX))
557 rate_str = ht_vht_rates[rate->index];
558 else
559 rate_str = "BAD_RATE";
560
561 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
562 rs_pretty_ant(rate->ant), rate_str);
563 return buf;
564 }
565
rs_dump_rate(struct iwl_mvm * mvm,const struct rs_rate * rate,const char * prefix)566 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
567 const char *prefix)
568 {
569 IWL_DEBUG_RATE(mvm,
570 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
571 prefix, rs_pretty_rate(rate), rate->bw,
572 rate->sgi, rate->ldpc, rate->stbc);
573 }
574
rs_rate_scale_clear_window(struct iwl_rate_scale_data * window)575 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
576 {
577 window->data = 0;
578 window->success_counter = 0;
579 window->success_ratio = IWL_INVALID_VALUE;
580 window->counter = 0;
581 window->average_tpt = IWL_INVALID_VALUE;
582 }
583
rs_rate_scale_clear_tbl_windows(struct iwl_mvm * mvm,struct iwl_scale_tbl_info * tbl)584 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
585 struct iwl_scale_tbl_info *tbl)
586 {
587 int i;
588
589 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
590 for (i = 0; i < IWL_RATE_COUNT; i++)
591 rs_rate_scale_clear_window(&tbl->win[i]);
592
593 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
594 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
595 }
596
rs_is_valid_ant(u8 valid_antenna,u8 ant_type)597 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
598 {
599 return (ant_type & valid_antenna) == ant_type;
600 }
601
rs_tl_turn_on_agg_for_tid(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_data,u8 tid,struct ieee80211_sta * sta)602 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
603 struct iwl_lq_sta *lq_data, u8 tid,
604 struct ieee80211_sta *sta)
605 {
606 int ret;
607
608 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
609 sta->addr, tid);
610
611 /* start BA session until the peer sends del BA */
612 ret = ieee80211_start_tx_ba_session(sta, tid, 0);
613 if (ret == -EAGAIN) {
614 /*
615 * driver and mac80211 is out of sync
616 * this might be cause by reloading firmware
617 * stop the tx ba session here
618 */
619 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
620 tid);
621 ieee80211_stop_tx_ba_session(sta, tid);
622 }
623 return ret;
624 }
625
rs_tl_turn_on_agg(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,u8 tid,struct iwl_lq_sta * lq_sta,struct ieee80211_sta * sta)626 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
627 u8 tid, struct iwl_lq_sta *lq_sta,
628 struct ieee80211_sta *sta)
629 {
630 struct iwl_mvm_tid_data *tid_data;
631
632 /*
633 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
634 * when the frame is not QoS
635 */
636 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
637 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
638 tid, IWL_MAX_TID_COUNT);
639 return;
640 } else if (tid == IWL_MAX_TID_COUNT) {
641 return;
642 }
643
644 tid_data = &mvmsta->tid_data[tid];
645 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
646 tid_data->state == IWL_AGG_OFF &&
647 (lq_sta->tx_agg_tid_en & BIT(tid)) &&
648 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
649 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
650 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
651 tid_data->state = IWL_AGG_QUEUED;
652 }
653 }
654
get_num_of_ant_from_rate(u32 rate_n_flags)655 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
656 {
657 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
658 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
659 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
660 }
661
662 /*
663 * Static function to get the expected throughput from an iwl_scale_tbl_info
664 * that wraps a NULL pointer check
665 */
get_expected_tpt(struct iwl_scale_tbl_info * tbl,int rs_index)666 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
667 {
668 if (tbl->expected_tpt)
669 return tbl->expected_tpt[rs_index];
670 return 0;
671 }
672
673 /**
674 * rs_collect_tx_data - Update the success/failure sliding window
675 *
676 * We keep a sliding window of the last 62 packets transmitted
677 * at this rate. window->data contains the bitmask of successful
678 * packets.
679 */
_rs_collect_tx_data(struct iwl_mvm * mvm,struct iwl_scale_tbl_info * tbl,int scale_index,int attempts,int successes,struct iwl_rate_scale_data * window)680 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
681 struct iwl_scale_tbl_info *tbl,
682 int scale_index, int attempts, int successes,
683 struct iwl_rate_scale_data *window)
684 {
685 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
686 s32 fail_count, tpt;
687
688 /* Get expected throughput */
689 tpt = get_expected_tpt(tbl, scale_index);
690
691 /*
692 * Keep track of only the latest 62 tx frame attempts in this rate's
693 * history window; anything older isn't really relevant any more.
694 * If we have filled up the sliding window, drop the oldest attempt;
695 * if the oldest attempt (highest bit in bitmap) shows "success",
696 * subtract "1" from the success counter (this is the main reason
697 * we keep these bitmaps!).
698 */
699 while (attempts > 0) {
700 if (window->counter >= IWL_RATE_MAX_WINDOW) {
701 /* remove earliest */
702 window->counter = IWL_RATE_MAX_WINDOW - 1;
703
704 if (window->data & mask) {
705 window->data &= ~mask;
706 window->success_counter--;
707 }
708 }
709
710 /* Increment frames-attempted counter */
711 window->counter++;
712
713 /* Shift bitmap by one frame to throw away oldest history */
714 window->data <<= 1;
715
716 /* Mark the most recent #successes attempts as successful */
717 if (successes > 0) {
718 window->success_counter++;
719 window->data |= 0x1;
720 successes--;
721 }
722
723 attempts--;
724 }
725
726 /* Calculate current success ratio, avoid divide-by-0! */
727 if (window->counter > 0)
728 window->success_ratio = 128 * (100 * window->success_counter)
729 / window->counter;
730 else
731 window->success_ratio = IWL_INVALID_VALUE;
732
733 fail_count = window->counter - window->success_counter;
734
735 /* Calculate average throughput, if we have enough history. */
736 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
737 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
738 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
739 else
740 window->average_tpt = IWL_INVALID_VALUE;
741
742 return 0;
743 }
744
rs_collect_tpc_data(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,int scale_index,int attempts,int successes,u8 reduced_txp)745 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
746 struct iwl_lq_sta *lq_sta,
747 struct iwl_scale_tbl_info *tbl,
748 int scale_index, int attempts, int successes,
749 u8 reduced_txp)
750 {
751 struct iwl_rate_scale_data *window = NULL;
752
753 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
754 return -EINVAL;
755
756 window = &tbl->tpc_win[reduced_txp];
757 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
758 window);
759 }
760
rs_update_tid_tpt_stats(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,u8 tid,int successes)761 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
762 struct iwl_mvm_sta *mvmsta,
763 u8 tid, int successes)
764 {
765 struct iwl_mvm_tid_data *tid_data;
766
767 if (tid >= IWL_MAX_TID_COUNT)
768 return;
769
770 tid_data = &mvmsta->tid_data[tid];
771
772 /*
773 * Measure if there're enough successful transmits per second.
774 * These statistics are used only to decide if we can start a
775 * BA session, so it should be updated only when A-MPDU is
776 * off.
777 */
778 if (tid_data->state != IWL_AGG_OFF)
779 return;
780
781 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
782 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
783 tid_data->tx_count_last = tid_data->tx_count;
784 tid_data->tx_count = 0;
785 tid_data->tpt_meas_start = jiffies;
786 } else {
787 tid_data->tx_count += successes;
788 }
789 }
790
rs_collect_tlc_data(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,u8 tid,struct iwl_scale_tbl_info * tbl,int scale_index,int attempts,int successes)791 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
792 struct iwl_mvm_sta *mvmsta, u8 tid,
793 struct iwl_scale_tbl_info *tbl,
794 int scale_index, int attempts, int successes)
795 {
796 struct iwl_rate_scale_data *window = NULL;
797
798 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
799 return -EINVAL;
800
801 if (tbl->column != RS_COLUMN_INVALID) {
802 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
803
804 pers->tx_stats[tbl->column][scale_index].total += attempts;
805 pers->tx_stats[tbl->column][scale_index].success += successes;
806 }
807
808 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
809
810 /* Select window for current tx bit rate */
811 window = &(tbl->win[scale_index]);
812 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
813 window);
814 }
815
816 /* Convert rs_rate object into ucode rate bitmask */
ucode_rate_from_rs_rate(struct iwl_mvm * mvm,struct rs_rate * rate)817 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
818 struct rs_rate *rate)
819 {
820 u32 ucode_rate = 0;
821 int index = rate->index;
822
823 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
824 RATE_MCS_ANT_ABC_MSK);
825
826 if (is_legacy(rate)) {
827 ucode_rate |= iwl_rates[index].plcp;
828 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
829 ucode_rate |= RATE_MCS_CCK_MSK;
830 return ucode_rate;
831 }
832
833 /* set RTS protection for all non legacy rates
834 * This helps with congested environments reducing the conflict cost to
835 * RTS retries only, instead of the entire BA packet.
836 */
837 ucode_rate |= RATE_MCS_RTS_REQUIRED_MSK;
838
839 if (is_ht(rate)) {
840 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
841 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
842 index = IWL_LAST_HT_RATE;
843 }
844 ucode_rate |= RATE_MCS_HT_MSK;
845
846 if (is_ht_siso(rate))
847 ucode_rate |= iwl_rates[index].plcp_ht_siso;
848 else if (is_ht_mimo2(rate))
849 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
850 else
851 WARN_ON_ONCE(1);
852 } else if (is_vht(rate)) {
853 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
854 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
855 index = IWL_LAST_VHT_RATE;
856 }
857 ucode_rate |= RATE_MCS_VHT_MSK;
858 if (is_vht_siso(rate))
859 ucode_rate |= iwl_rates[index].plcp_vht_siso;
860 else if (is_vht_mimo2(rate))
861 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
862 else
863 WARN_ON_ONCE(1);
864
865 } else {
866 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
867 }
868
869 if (is_siso(rate) && rate->stbc) {
870 /* To enable STBC we need to set both a flag and ANT_AB */
871 ucode_rate |= RATE_MCS_ANT_AB_MSK;
872 ucode_rate |= RATE_MCS_STBC_MSK;
873 }
874
875 ucode_rate |= rate->bw;
876 if (rate->sgi)
877 ucode_rate |= RATE_MCS_SGI_MSK;
878 if (rate->ldpc)
879 ucode_rate |= RATE_MCS_LDPC_MSK;
880
881 return ucode_rate;
882 }
883
884 /* Convert a ucode rate into an rs_rate object */
rs_rate_from_ucode_rate(const u32 ucode_rate,enum nl80211_band band,struct rs_rate * rate)885 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
886 enum nl80211_band band,
887 struct rs_rate *rate)
888 {
889 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
890 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
891 u8 nss;
892
893 memset(rate, 0, sizeof(*rate));
894 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
895
896 if (rate->index == IWL_RATE_INVALID)
897 return -EINVAL;
898
899 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
900
901 /* Legacy */
902 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
903 !(ucode_rate & RATE_MCS_VHT_MSK) &&
904 !(ucode_rate & RATE_MCS_HE_MSK)) {
905 if (num_of_ant == 1) {
906 if (band == NL80211_BAND_5GHZ)
907 rate->type = LQ_LEGACY_A;
908 else
909 rate->type = LQ_LEGACY_G;
910 }
911
912 return 0;
913 }
914
915 /* HT, VHT or HE */
916 if (ucode_rate & RATE_MCS_SGI_MSK)
917 rate->sgi = true;
918 if (ucode_rate & RATE_MCS_LDPC_MSK)
919 rate->ldpc = true;
920 if (ucode_rate & RATE_MCS_STBC_MSK)
921 rate->stbc = true;
922 if (ucode_rate & RATE_MCS_BF_MSK)
923 rate->bfer = true;
924
925 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
926
927 if (ucode_rate & RATE_MCS_HT_MSK) {
928 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
929 RATE_HT_MCS_NSS_POS) + 1;
930
931 if (nss == 1) {
932 rate->type = LQ_HT_SISO;
933 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
934 "stbc %d bfer %d",
935 rate->stbc, rate->bfer);
936 } else if (nss == 2) {
937 rate->type = LQ_HT_MIMO2;
938 WARN_ON_ONCE(num_of_ant != 2);
939 } else {
940 WARN_ON_ONCE(1);
941 }
942 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
943 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
944 RATE_VHT_MCS_NSS_POS) + 1;
945
946 if (nss == 1) {
947 rate->type = LQ_VHT_SISO;
948 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
949 "stbc %d bfer %d",
950 rate->stbc, rate->bfer);
951 } else if (nss == 2) {
952 rate->type = LQ_VHT_MIMO2;
953 WARN_ON_ONCE(num_of_ant != 2);
954 } else {
955 WARN_ON_ONCE(1);
956 }
957 } else if (ucode_rate & RATE_MCS_HE_MSK) {
958 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
959 RATE_VHT_MCS_NSS_POS) + 1;
960
961 if (nss == 1) {
962 rate->type = LQ_HE_SISO;
963 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
964 "stbc %d bfer %d", rate->stbc, rate->bfer);
965 } else if (nss == 2) {
966 rate->type = LQ_HE_MIMO2;
967 WARN_ON_ONCE(num_of_ant != 2);
968 } else {
969 WARN_ON_ONCE(1);
970 }
971 }
972
973 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
974 !is_he(rate) && !is_vht(rate));
975
976 return 0;
977 }
978
979 /* switch to another antenna/antennas and return 1 */
980 /* if no other valid antenna found, return 0 */
rs_toggle_antenna(u32 valid_ant,struct rs_rate * rate)981 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
982 {
983 u8 new_ant_type;
984
985 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C))
986 return 0;
987
988 if (!rs_is_valid_ant(valid_ant, rate->ant))
989 return 0;
990
991 new_ant_type = ant_toggle_lookup[rate->ant];
992
993 while ((new_ant_type != rate->ant) &&
994 !rs_is_valid_ant(valid_ant, new_ant_type))
995 new_ant_type = ant_toggle_lookup[new_ant_type];
996
997 if (new_ant_type == rate->ant)
998 return 0;
999
1000 rate->ant = new_ant_type;
1001
1002 return 1;
1003 }
1004
rs_get_supported_rates(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1005 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
1006 struct rs_rate *rate)
1007 {
1008 if (is_legacy(rate))
1009 return lq_sta->active_legacy_rate;
1010 else if (is_siso(rate))
1011 return lq_sta->active_siso_rate;
1012 else if (is_mimo2(rate))
1013 return lq_sta->active_mimo2_rate;
1014
1015 WARN_ON_ONCE(1);
1016 return 0;
1017 }
1018
rs_get_adjacent_rate(struct iwl_mvm * mvm,u8 index,u16 rate_mask,int rate_type)1019 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1020 int rate_type)
1021 {
1022 u8 high = IWL_RATE_INVALID;
1023 u8 low = IWL_RATE_INVALID;
1024
1025 /* 802.11A or ht walks to the next literal adjacent rate in
1026 * the rate table */
1027 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1028 int i;
1029 u32 mask;
1030
1031 /* Find the previous rate that is in the rate mask */
1032 i = index - 1;
1033 if (i >= 0)
1034 mask = BIT(i);
1035 for (; i >= 0; i--, mask >>= 1) {
1036 if (rate_mask & mask) {
1037 low = i;
1038 break;
1039 }
1040 }
1041
1042 /* Find the next rate that is in the rate mask */
1043 i = index + 1;
1044 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1045 if (rate_mask & mask) {
1046 high = i;
1047 break;
1048 }
1049 }
1050
1051 return (high << 8) | low;
1052 }
1053
1054 low = index;
1055 while (low != IWL_RATE_INVALID) {
1056 low = iwl_rates[low].prev_rs;
1057 if (low == IWL_RATE_INVALID)
1058 break;
1059 if (rate_mask & (1 << low))
1060 break;
1061 }
1062
1063 high = index;
1064 while (high != IWL_RATE_INVALID) {
1065 high = iwl_rates[high].next_rs;
1066 if (high == IWL_RATE_INVALID)
1067 break;
1068 if (rate_mask & (1 << high))
1069 break;
1070 }
1071
1072 return (high << 8) | low;
1073 }
1074
rs_rate_supported(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1075 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1076 struct rs_rate *rate)
1077 {
1078 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1079 }
1080
1081 /* Get the next supported lower rate in the current column.
1082 * Return true if bottom rate in the current column was reached
1083 */
rs_get_lower_rate_in_column(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1084 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1085 struct rs_rate *rate)
1086 {
1087 u8 low;
1088 u16 high_low;
1089 u16 rate_mask;
1090 struct iwl_mvm *mvm = lq_sta->pers.drv;
1091
1092 rate_mask = rs_get_supported_rates(lq_sta, rate);
1093 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1094 rate->type);
1095 low = high_low & 0xff;
1096
1097 /* Bottom rate of column reached */
1098 if (low == IWL_RATE_INVALID)
1099 return true;
1100
1101 rate->index = low;
1102 return false;
1103 }
1104
1105 /* Get the next rate to use following a column downgrade */
rs_get_lower_rate_down_column(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1106 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1107 struct rs_rate *rate)
1108 {
1109 struct iwl_mvm *mvm = lq_sta->pers.drv;
1110
1111 if (is_legacy(rate)) {
1112 /* No column to downgrade from Legacy */
1113 return;
1114 } else if (is_siso(rate)) {
1115 /* Downgrade to Legacy if we were in SISO */
1116 if (lq_sta->band == NL80211_BAND_5GHZ)
1117 rate->type = LQ_LEGACY_A;
1118 else
1119 rate->type = LQ_LEGACY_G;
1120
1121 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1122
1123 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1124 rate->index > IWL_RATE_MCS_9_INDEX);
1125
1126 rate->index = rs_ht_to_legacy[rate->index];
1127 rate->ldpc = false;
1128 } else {
1129 /* Downgrade to SISO with same MCS if in MIMO */
1130 rate->type = is_vht_mimo2(rate) ?
1131 LQ_VHT_SISO : LQ_HT_SISO;
1132 }
1133
1134 if (num_of_ant(rate->ant) > 1)
1135 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1136
1137 /* Relevant in both switching to SISO or Legacy */
1138 rate->sgi = false;
1139
1140 if (!rs_rate_supported(lq_sta, rate))
1141 rs_get_lower_rate_in_column(lq_sta, rate);
1142 }
1143
1144 /* Check if both rates share the same column */
rs_rate_column_match(struct rs_rate * a,struct rs_rate * b)1145 static inline bool rs_rate_column_match(struct rs_rate *a,
1146 struct rs_rate *b)
1147 {
1148 bool ant_match;
1149
1150 if (a->stbc || a->bfer)
1151 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1152 else
1153 ant_match = (a->ant == b->ant);
1154
1155 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1156 && ant_match;
1157 }
1158
rs_get_column_from_rate(struct rs_rate * rate)1159 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1160 {
1161 if (is_legacy(rate)) {
1162 if (rate->ant == ANT_A)
1163 return RS_COLUMN_LEGACY_ANT_A;
1164
1165 if (rate->ant == ANT_B)
1166 return RS_COLUMN_LEGACY_ANT_B;
1167
1168 goto err;
1169 }
1170
1171 if (is_siso(rate)) {
1172 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1173 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1174 RS_COLUMN_SISO_ANT_A;
1175
1176 if (rate->ant == ANT_B)
1177 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1178 RS_COLUMN_SISO_ANT_B;
1179
1180 goto err;
1181 }
1182
1183 if (is_mimo(rate))
1184 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1185
1186 err:
1187 return RS_COLUMN_INVALID;
1188 }
1189
rs_get_tid(struct ieee80211_hdr * hdr)1190 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1191 {
1192 u8 tid = IWL_MAX_TID_COUNT;
1193
1194 if (ieee80211_is_data_qos(hdr->frame_control)) {
1195 u8 *qc = ieee80211_get_qos_ctl(hdr);
1196 tid = qc[0] & 0xf;
1197 }
1198
1199 if (unlikely(tid > IWL_MAX_TID_COUNT))
1200 tid = IWL_MAX_TID_COUNT;
1201
1202 return tid;
1203 }
1204
1205 /*
1206 * mac80211 sends us Tx status
1207 */
rs_drv_mac80211_tx_status(void * mvm_r,struct ieee80211_supported_band * sband,struct ieee80211_sta * sta,void * priv_sta,struct sk_buff * skb)1208 static void rs_drv_mac80211_tx_status(void *mvm_r,
1209 struct ieee80211_supported_band *sband,
1210 struct ieee80211_sta *sta, void *priv_sta,
1211 struct sk_buff *skb)
1212 {
1213 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1214 struct iwl_op_mode *op_mode = mvm_r;
1215 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1216 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1217 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1218
1219 if (!mvmsta->vif)
1220 return;
1221
1222 if (!ieee80211_is_data(hdr->frame_control) ||
1223 info->flags & IEEE80211_TX_CTL_NO_ACK)
1224 return;
1225
1226 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1227 ieee80211_is_qos_nullfunc(hdr->frame_control));
1228 }
1229
1230 /*
1231 * Begin a period of staying with a selected modulation mode.
1232 * Set "stay_in_tbl" flag to prevent any mode switches.
1233 * Set frame tx success limits according to legacy vs. high-throughput,
1234 * and reset overall (spanning all rates) tx success history statistics.
1235 * These control how long we stay using same modulation mode before
1236 * searching for a new mode.
1237 */
rs_set_stay_in_table(struct iwl_mvm * mvm,u8 is_legacy,struct iwl_lq_sta * lq_sta)1238 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1239 struct iwl_lq_sta *lq_sta)
1240 {
1241 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1242 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1243 if (is_legacy) {
1244 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1245 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1246 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1247 } else {
1248 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1249 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1250 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1251 }
1252 lq_sta->table_count = 0;
1253 lq_sta->total_failed = 0;
1254 lq_sta->total_success = 0;
1255 lq_sta->flush_timer = jiffies;
1256 lq_sta->visited_columns = 0;
1257 }
1258
rs_get_max_rate_from_mask(unsigned long rate_mask)1259 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1260 {
1261 if (rate_mask)
1262 return find_last_bit(&rate_mask, BITS_PER_LONG);
1263 return IWL_RATE_INVALID;
1264 }
1265
rs_get_max_allowed_rate(struct iwl_lq_sta * lq_sta,const struct rs_tx_column * column)1266 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1267 const struct rs_tx_column *column)
1268 {
1269 switch (column->mode) {
1270 case RS_LEGACY:
1271 return lq_sta->max_legacy_rate_idx;
1272 case RS_SISO:
1273 return lq_sta->max_siso_rate_idx;
1274 case RS_MIMO2:
1275 return lq_sta->max_mimo2_rate_idx;
1276 default:
1277 WARN_ON_ONCE(1);
1278 }
1279
1280 return lq_sta->max_legacy_rate_idx;
1281 }
1282
rs_get_expected_tpt_table(struct iwl_lq_sta * lq_sta,const struct rs_tx_column * column,u32 bw)1283 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1284 const struct rs_tx_column *column,
1285 u32 bw)
1286 {
1287 /* Used to choose among HT tables */
1288 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1289
1290 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1291 column->mode != RS_SISO &&
1292 column->mode != RS_MIMO2))
1293 return expected_tpt_legacy;
1294
1295 /* Legacy rates have only one table */
1296 if (column->mode == RS_LEGACY)
1297 return expected_tpt_legacy;
1298
1299 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1300 /* Choose among many HT tables depending on number of streams
1301 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1302 * status */
1303 if (column->mode == RS_SISO) {
1304 switch (bw) {
1305 case RATE_MCS_CHAN_WIDTH_20:
1306 ht_tbl_pointer = expected_tpt_siso_20MHz;
1307 break;
1308 case RATE_MCS_CHAN_WIDTH_40:
1309 ht_tbl_pointer = expected_tpt_siso_40MHz;
1310 break;
1311 case RATE_MCS_CHAN_WIDTH_80:
1312 ht_tbl_pointer = expected_tpt_siso_80MHz;
1313 break;
1314 case RATE_MCS_CHAN_WIDTH_160:
1315 ht_tbl_pointer = expected_tpt_siso_160MHz;
1316 break;
1317 default:
1318 WARN_ON_ONCE(1);
1319 }
1320 } else if (column->mode == RS_MIMO2) {
1321 switch (bw) {
1322 case RATE_MCS_CHAN_WIDTH_20:
1323 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1324 break;
1325 case RATE_MCS_CHAN_WIDTH_40:
1326 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1327 break;
1328 case RATE_MCS_CHAN_WIDTH_80:
1329 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1330 break;
1331 case RATE_MCS_CHAN_WIDTH_160:
1332 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1333 break;
1334 default:
1335 WARN_ON_ONCE(1);
1336 }
1337 } else {
1338 WARN_ON_ONCE(1);
1339 }
1340
1341 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1342 return ht_tbl_pointer[0];
1343 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1344 return ht_tbl_pointer[1];
1345 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1346 return ht_tbl_pointer[2];
1347 else /* AGG+SGI */
1348 return ht_tbl_pointer[3];
1349 }
1350
rs_set_expected_tpt_table(struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)1351 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1352 struct iwl_scale_tbl_info *tbl)
1353 {
1354 struct rs_rate *rate = &tbl->rate;
1355 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1356
1357 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1358 }
1359
1360 /* rs uses two tables, one is active and the second is for searching better
1361 * configuration. This function, according to the index of the currently
1362 * active table returns the search table, which is located at the
1363 * index complementary to 1 according to the active table (active = 1,
1364 * search = 0 or active = 0, search = 1).
1365 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1366 */
rs_search_tbl(u8 active_tbl)1367 static inline u8 rs_search_tbl(u8 active_tbl)
1368 {
1369 return (active_tbl ^ 1) & 1;
1370 }
1371
rs_get_best_rate(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,unsigned long rate_mask,s8 index)1372 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1373 struct iwl_lq_sta *lq_sta,
1374 struct iwl_scale_tbl_info *tbl, /* "search" */
1375 unsigned long rate_mask, s8 index)
1376 {
1377 struct iwl_scale_tbl_info *active_tbl =
1378 &(lq_sta->lq_info[lq_sta->active_tbl]);
1379 s32 success_ratio = active_tbl->win[index].success_ratio;
1380 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1381 const u16 *tpt_tbl = tbl->expected_tpt;
1382 u16 high_low;
1383 u32 target_tpt;
1384 int rate_idx;
1385
1386 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1387 target_tpt = 100 * expected_current_tpt;
1388 IWL_DEBUG_RATE(mvm,
1389 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1390 success_ratio, target_tpt);
1391 } else {
1392 target_tpt = lq_sta->last_tpt;
1393 IWL_DEBUG_RATE(mvm,
1394 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1395 success_ratio, target_tpt);
1396 }
1397
1398 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1399
1400 while (rate_idx != IWL_RATE_INVALID) {
1401 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1402 break;
1403
1404 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1405 tbl->rate.type);
1406
1407 rate_idx = (high_low >> 8) & 0xff;
1408 }
1409
1410 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1411 rate_idx, target_tpt,
1412 rate_idx != IWL_RATE_INVALID ?
1413 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1414
1415 return rate_idx;
1416 }
1417
rs_bw_from_sta_bw(struct ieee80211_sta * sta)1418 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1419 {
1420 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap;
1421 struct ieee80211_vht_cap vht_cap = {
1422 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1423 .supp_mcs = sta_vht_cap->vht_mcs,
1424 };
1425
1426 switch (sta->bandwidth) {
1427 case IEEE80211_STA_RX_BW_160:
1428 /*
1429 * Don't use 160 MHz if VHT extended NSS support
1430 * says we cannot use 2 streams, we don't want to
1431 * deal with this.
1432 * We only check MCS 0 - they will support that if
1433 * we got here at all and we don't care which MCS,
1434 * we want to determine a more global state.
1435 */
1436 if (ieee80211_get_vht_max_nss(&vht_cap,
1437 IEEE80211_VHT_CHANWIDTH_160MHZ,
1438 0, true,
1439 sta->rx_nss) < sta->rx_nss)
1440 return RATE_MCS_CHAN_WIDTH_80;
1441 return RATE_MCS_CHAN_WIDTH_160;
1442 case IEEE80211_STA_RX_BW_80:
1443 return RATE_MCS_CHAN_WIDTH_80;
1444 case IEEE80211_STA_RX_BW_40:
1445 return RATE_MCS_CHAN_WIDTH_40;
1446 case IEEE80211_STA_RX_BW_20:
1447 default:
1448 return RATE_MCS_CHAN_WIDTH_20;
1449 }
1450 }
1451
1452 /*
1453 * Check whether we should continue using same modulation mode, or
1454 * begin search for a new mode, based on:
1455 * 1) # tx successes or failures while using this mode
1456 * 2) # times calling this function
1457 * 3) elapsed time in this mode (not used, for now)
1458 */
rs_stay_in_table(struct iwl_lq_sta * lq_sta,bool force_search)1459 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1460 {
1461 struct iwl_scale_tbl_info *tbl;
1462 int active_tbl;
1463 int flush_interval_passed = 0;
1464 struct iwl_mvm *mvm;
1465
1466 mvm = lq_sta->pers.drv;
1467 active_tbl = lq_sta->active_tbl;
1468
1469 tbl = &(lq_sta->lq_info[active_tbl]);
1470
1471 /* If we've been disallowing search, see if we should now allow it */
1472 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1473 /* Elapsed time using current modulation mode */
1474 if (lq_sta->flush_timer)
1475 flush_interval_passed =
1476 time_after(jiffies,
1477 (unsigned long)(lq_sta->flush_timer +
1478 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1479
1480 /*
1481 * Check if we should allow search for new modulation mode.
1482 * If many frames have failed or succeeded, or we've used
1483 * this same modulation for a long time, allow search, and
1484 * reset history stats that keep track of whether we should
1485 * allow a new search. Also (below) reset all bitmaps and
1486 * stats in active history.
1487 */
1488 if (force_search ||
1489 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1490 (lq_sta->total_success > lq_sta->max_success_limit) ||
1491 ((!lq_sta->search_better_tbl) &&
1492 (lq_sta->flush_timer) && (flush_interval_passed))) {
1493 IWL_DEBUG_RATE(mvm,
1494 "LQ: stay is expired %d %d %d\n",
1495 lq_sta->total_failed,
1496 lq_sta->total_success,
1497 flush_interval_passed);
1498
1499 /* Allow search for new mode */
1500 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1501 IWL_DEBUG_RATE(mvm,
1502 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1503 lq_sta->total_failed = 0;
1504 lq_sta->total_success = 0;
1505 lq_sta->flush_timer = 0;
1506 /* mark the current column as visited */
1507 lq_sta->visited_columns = BIT(tbl->column);
1508 /*
1509 * Else if we've used this modulation mode enough repetitions
1510 * (regardless of elapsed time or success/failure), reset
1511 * history bitmaps and rate-specific stats for all rates in
1512 * active table.
1513 */
1514 } else {
1515 lq_sta->table_count++;
1516 if (lq_sta->table_count >=
1517 lq_sta->table_count_limit) {
1518 lq_sta->table_count = 0;
1519
1520 IWL_DEBUG_RATE(mvm,
1521 "LQ: stay in table clear win\n");
1522 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1523 }
1524 }
1525
1526 /* If transitioning to allow "search", reset all history
1527 * bitmaps and stats in active table (this will become the new
1528 * "search" table). */
1529 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1530 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1531 }
1532 }
1533 }
1534
rs_set_amsdu_len(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl,enum rs_action scale_action)1535 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1536 struct iwl_scale_tbl_info *tbl,
1537 enum rs_action scale_action)
1538 {
1539 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1540 int i;
1541
1542 sta->max_amsdu_len = rs_fw_get_max_amsdu_len(sta);
1543
1544 /*
1545 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1546 * or 0, since there is no per-TID alg.
1547 */
1548 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1549 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1550 scale_action == RS_ACTION_DOWNSCALE)
1551 mvmsta->amsdu_enabled = 0;
1552 else
1553 mvmsta->amsdu_enabled = 0xFFFF;
1554
1555 if (mvmsta->vif->bss_conf.he_support &&
1556 !iwlwifi_mod_params.disable_11ax)
1557 mvmsta->max_amsdu_len = sta->max_amsdu_len;
1558 else
1559 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1560
1561 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1562
1563 for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1564 if (mvmsta->amsdu_enabled)
1565 sta->max_tid_amsdu_len[i] =
1566 iwl_mvm_max_amsdu_size(mvm, sta, i);
1567 else
1568 /*
1569 * Not so elegant, but this will effectively
1570 * prevent AMSDU on this TID
1571 */
1572 sta->max_tid_amsdu_len[i] = 1;
1573 }
1574 }
1575
1576 /*
1577 * setup rate table in uCode
1578 */
rs_update_rate_tbl(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)1579 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1580 struct ieee80211_sta *sta,
1581 struct iwl_lq_sta *lq_sta,
1582 struct iwl_scale_tbl_info *tbl)
1583 {
1584 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1585 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1586 }
1587
rs_tweak_rate_tbl(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl,enum rs_action scale_action)1588 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1589 struct ieee80211_sta *sta,
1590 struct iwl_lq_sta *lq_sta,
1591 struct iwl_scale_tbl_info *tbl,
1592 enum rs_action scale_action)
1593 {
1594 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1595 return false;
1596
1597 if (!is_vht_siso(&tbl->rate))
1598 return false;
1599
1600 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1601 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1602 (scale_action == RS_ACTION_DOWNSCALE)) {
1603 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1604 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1605 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1606 goto tweaked;
1607 }
1608
1609 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1610 * sustainable, i.e. we're past the test window. We can't go back
1611 * if MCS5 is just tested as this will happen always after switching
1612 * to 20Mhz MCS4 because the rate stats are cleared.
1613 */
1614 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1615 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1616 (scale_action == RS_ACTION_STAY)) ||
1617 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1618 (scale_action == RS_ACTION_UPSCALE)))) {
1619 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1620 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1621 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1622 goto tweaked;
1623 }
1624
1625 return false;
1626
1627 tweaked:
1628 rs_set_expected_tpt_table(lq_sta, tbl);
1629 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1630 return true;
1631 }
1632
rs_get_next_column(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl)1633 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1634 struct iwl_lq_sta *lq_sta,
1635 struct ieee80211_sta *sta,
1636 struct iwl_scale_tbl_info *tbl)
1637 {
1638 int i, j, max_rate;
1639 enum rs_column next_col_id;
1640 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1641 const struct rs_tx_column *next_col;
1642 allow_column_func_t allow_func;
1643 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1644 const u16 *expected_tpt_tbl;
1645 u16 tpt, max_expected_tpt;
1646
1647 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1648 next_col_id = curr_col->next_columns[i];
1649
1650 if (next_col_id == RS_COLUMN_INVALID)
1651 continue;
1652
1653 if (lq_sta->visited_columns & BIT(next_col_id)) {
1654 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1655 next_col_id);
1656 continue;
1657 }
1658
1659 next_col = &rs_tx_columns[next_col_id];
1660
1661 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1662 IWL_DEBUG_RATE(mvm,
1663 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1664 next_col_id, valid_ants, next_col->ant);
1665 continue;
1666 }
1667
1668 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1669 allow_func = next_col->checks[j];
1670 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1671 next_col))
1672 break;
1673 }
1674
1675 if (j != MAX_COLUMN_CHECKS) {
1676 IWL_DEBUG_RATE(mvm,
1677 "Skip column %d: not allowed (check %d failed)\n",
1678 next_col_id, j);
1679
1680 continue;
1681 }
1682
1683 tpt = lq_sta->last_tpt / 100;
1684 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1685 rs_bw_from_sta_bw(sta));
1686 if (WARN_ON_ONCE(!expected_tpt_tbl))
1687 continue;
1688
1689 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1690 if (max_rate == IWL_RATE_INVALID) {
1691 IWL_DEBUG_RATE(mvm,
1692 "Skip column %d: no rate is allowed in this column\n",
1693 next_col_id);
1694 continue;
1695 }
1696
1697 max_expected_tpt = expected_tpt_tbl[max_rate];
1698 if (tpt >= max_expected_tpt) {
1699 IWL_DEBUG_RATE(mvm,
1700 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1701 next_col_id, max_expected_tpt, tpt);
1702 continue;
1703 }
1704
1705 IWL_DEBUG_RATE(mvm,
1706 "Found potential column %d. Max expected %d current %d\n",
1707 next_col_id, max_expected_tpt, tpt);
1708 break;
1709 }
1710
1711 if (i == MAX_NEXT_COLUMNS)
1712 return RS_COLUMN_INVALID;
1713
1714 return next_col_id;
1715 }
1716
rs_switch_to_column(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct ieee80211_sta * sta,enum rs_column col_id)1717 static int rs_switch_to_column(struct iwl_mvm *mvm,
1718 struct iwl_lq_sta *lq_sta,
1719 struct ieee80211_sta *sta,
1720 enum rs_column col_id)
1721 {
1722 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1723 struct iwl_scale_tbl_info *search_tbl =
1724 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1725 struct rs_rate *rate = &search_tbl->rate;
1726 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1727 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1728 unsigned long rate_mask = 0;
1729 u32 rate_idx = 0;
1730
1731 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1732
1733 rate->sgi = column->sgi;
1734 rate->ant = column->ant;
1735
1736 if (column->mode == RS_LEGACY) {
1737 if (lq_sta->band == NL80211_BAND_5GHZ)
1738 rate->type = LQ_LEGACY_A;
1739 else
1740 rate->type = LQ_LEGACY_G;
1741
1742 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1743 rate->ldpc = false;
1744 rate_mask = lq_sta->active_legacy_rate;
1745 } else if (column->mode == RS_SISO) {
1746 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1747 rate_mask = lq_sta->active_siso_rate;
1748 } else if (column->mode == RS_MIMO2) {
1749 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1750 rate_mask = lq_sta->active_mimo2_rate;
1751 } else {
1752 WARN_ONCE(1, "Bad column mode");
1753 }
1754
1755 if (column->mode != RS_LEGACY) {
1756 rate->bw = rs_bw_from_sta_bw(sta);
1757 rate->ldpc = lq_sta->ldpc;
1758 }
1759
1760 search_tbl->column = col_id;
1761 rs_set_expected_tpt_table(lq_sta, search_tbl);
1762
1763 lq_sta->visited_columns |= BIT(col_id);
1764
1765 /* Get the best matching rate if we're changing modes. e.g.
1766 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1767 */
1768 if (curr_column->mode != column->mode) {
1769 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1770 rate_mask, rate->index);
1771
1772 if ((rate_idx == IWL_RATE_INVALID) ||
1773 !(BIT(rate_idx) & rate_mask)) {
1774 IWL_DEBUG_RATE(mvm,
1775 "can not switch with index %d"
1776 " rate mask %lx\n",
1777 rate_idx, rate_mask);
1778
1779 goto err;
1780 }
1781
1782 rate->index = rate_idx;
1783 }
1784
1785 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1786 col_id, rate->index);
1787
1788 return 0;
1789
1790 err:
1791 rate->type = LQ_NONE;
1792 return -1;
1793 }
1794
rs_get_rate_action(struct iwl_mvm * mvm,struct iwl_scale_tbl_info * tbl,s32 sr,int low,int high,int current_tpt,int low_tpt,int high_tpt)1795 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1796 struct iwl_scale_tbl_info *tbl,
1797 s32 sr, int low, int high,
1798 int current_tpt,
1799 int low_tpt, int high_tpt)
1800 {
1801 enum rs_action action = RS_ACTION_STAY;
1802
1803 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1804 (current_tpt == 0)) {
1805 IWL_DEBUG_RATE(mvm,
1806 "Decrease rate because of low SR\n");
1807 return RS_ACTION_DOWNSCALE;
1808 }
1809
1810 if ((low_tpt == IWL_INVALID_VALUE) &&
1811 (high_tpt == IWL_INVALID_VALUE) &&
1812 (high != IWL_RATE_INVALID)) {
1813 IWL_DEBUG_RATE(mvm,
1814 "No data about high/low rates. Increase rate\n");
1815 return RS_ACTION_UPSCALE;
1816 }
1817
1818 if ((high_tpt == IWL_INVALID_VALUE) &&
1819 (high != IWL_RATE_INVALID) &&
1820 (low_tpt != IWL_INVALID_VALUE) &&
1821 (low_tpt < current_tpt)) {
1822 IWL_DEBUG_RATE(mvm,
1823 "No data about high rate and low rate is worse. Increase rate\n");
1824 return RS_ACTION_UPSCALE;
1825 }
1826
1827 if ((high_tpt != IWL_INVALID_VALUE) &&
1828 (high_tpt > current_tpt)) {
1829 IWL_DEBUG_RATE(mvm,
1830 "Higher rate is better. Increate rate\n");
1831 return RS_ACTION_UPSCALE;
1832 }
1833
1834 if ((low_tpt != IWL_INVALID_VALUE) &&
1835 (high_tpt != IWL_INVALID_VALUE) &&
1836 (low_tpt < current_tpt) &&
1837 (high_tpt < current_tpt)) {
1838 IWL_DEBUG_RATE(mvm,
1839 "Both high and low are worse. Maintain rate\n");
1840 return RS_ACTION_STAY;
1841 }
1842
1843 if ((low_tpt != IWL_INVALID_VALUE) &&
1844 (low_tpt > current_tpt)) {
1845 IWL_DEBUG_RATE(mvm,
1846 "Lower rate is better\n");
1847 action = RS_ACTION_DOWNSCALE;
1848 goto out;
1849 }
1850
1851 if ((low_tpt == IWL_INVALID_VALUE) &&
1852 (low != IWL_RATE_INVALID)) {
1853 IWL_DEBUG_RATE(mvm,
1854 "No data about lower rate\n");
1855 action = RS_ACTION_DOWNSCALE;
1856 goto out;
1857 }
1858
1859 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1860
1861 out:
1862 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1863 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1864 IWL_DEBUG_RATE(mvm,
1865 "SR is above NO DECREASE. Avoid downscale\n");
1866 action = RS_ACTION_STAY;
1867 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1868 IWL_DEBUG_RATE(mvm,
1869 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1870 action = RS_ACTION_STAY;
1871 } else {
1872 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1873 }
1874 }
1875
1876 return action;
1877 }
1878
rs_stbc_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)1879 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1880 struct iwl_lq_sta *lq_sta)
1881 {
1882 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1883 * supports STBC of at least 1*SS
1884 */
1885 if (!lq_sta->stbc_capable)
1886 return false;
1887
1888 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1889 return false;
1890
1891 return true;
1892 }
1893
rs_get_adjacent_txp(struct iwl_mvm * mvm,int index,int * weaker,int * stronger)1894 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1895 int *weaker, int *stronger)
1896 {
1897 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1898 if (*weaker > TPC_MAX_REDUCTION)
1899 *weaker = TPC_INVALID;
1900
1901 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1902 if (*stronger < 0)
1903 *stronger = TPC_INVALID;
1904 }
1905
rs_tpc_allowed(struct iwl_mvm * mvm,struct ieee80211_vif * vif,struct rs_rate * rate,enum nl80211_band band)1906 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1907 struct rs_rate *rate, enum nl80211_band band)
1908 {
1909 int index = rate->index;
1910 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1911 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1912 !vif->bss_conf.ps);
1913
1914 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1915 cam, sta_ps_disabled);
1916 /*
1917 * allow tpc only if power management is enabled, or bt coex
1918 * activity grade allows it and we are on 2.4Ghz.
1919 */
1920 if ((cam || sta_ps_disabled) &&
1921 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1922 return false;
1923
1924 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1925 if (is_legacy(rate))
1926 return index == IWL_RATE_54M_INDEX;
1927 if (is_ht(rate))
1928 return index == IWL_RATE_MCS_7_INDEX;
1929 if (is_vht(rate))
1930 return index == IWL_RATE_MCS_7_INDEX ||
1931 index == IWL_RATE_MCS_8_INDEX ||
1932 index == IWL_RATE_MCS_9_INDEX;
1933
1934 WARN_ON_ONCE(1);
1935 return false;
1936 }
1937
1938 enum tpc_action {
1939 TPC_ACTION_STAY,
1940 TPC_ACTION_DECREASE,
1941 TPC_ACTION_INCREASE,
1942 TPC_ACTION_NO_RESTIRCTION,
1943 };
1944
rs_get_tpc_action(struct iwl_mvm * mvm,s32 sr,int weak,int strong,int current_tpt,int weak_tpt,int strong_tpt)1945 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1946 s32 sr, int weak, int strong,
1947 int current_tpt,
1948 int weak_tpt, int strong_tpt)
1949 {
1950 /* stay until we have valid tpt */
1951 if (current_tpt == IWL_INVALID_VALUE) {
1952 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1953 return TPC_ACTION_STAY;
1954 }
1955
1956 /* Too many failures, increase txp */
1957 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1958 current_tpt == 0) {
1959 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1960 return TPC_ACTION_NO_RESTIRCTION;
1961 }
1962
1963 /* try decreasing first if applicable */
1964 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1965 weak != TPC_INVALID) {
1966 if (weak_tpt == IWL_INVALID_VALUE &&
1967 (strong_tpt == IWL_INVALID_VALUE ||
1968 current_tpt >= strong_tpt)) {
1969 IWL_DEBUG_RATE(mvm,
1970 "no weak txp measurement. decrease txp\n");
1971 return TPC_ACTION_DECREASE;
1972 }
1973
1974 if (weak_tpt > current_tpt) {
1975 IWL_DEBUG_RATE(mvm,
1976 "lower txp has better tpt. decrease txp\n");
1977 return TPC_ACTION_DECREASE;
1978 }
1979 }
1980
1981 /* next, increase if needed */
1982 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1983 strong != TPC_INVALID) {
1984 if (weak_tpt == IWL_INVALID_VALUE &&
1985 strong_tpt != IWL_INVALID_VALUE &&
1986 current_tpt < strong_tpt) {
1987 IWL_DEBUG_RATE(mvm,
1988 "higher txp has better tpt. increase txp\n");
1989 return TPC_ACTION_INCREASE;
1990 }
1991
1992 if (weak_tpt < current_tpt &&
1993 (strong_tpt == IWL_INVALID_VALUE ||
1994 strong_tpt > current_tpt)) {
1995 IWL_DEBUG_RATE(mvm,
1996 "lower txp has worse tpt. increase txp\n");
1997 return TPC_ACTION_INCREASE;
1998 }
1999 }
2000
2001 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2002 return TPC_ACTION_STAY;
2003 }
2004
rs_tpc_perform(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)2005 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2006 struct ieee80211_sta *sta,
2007 struct iwl_lq_sta *lq_sta,
2008 struct iwl_scale_tbl_info *tbl)
2009 {
2010 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2011 struct ieee80211_vif *vif = mvm_sta->vif;
2012 struct ieee80211_chanctx_conf *chanctx_conf;
2013 enum nl80211_band band;
2014 struct iwl_rate_scale_data *window;
2015 struct rs_rate *rate = &tbl->rate;
2016 enum tpc_action action;
2017 s32 sr;
2018 u8 cur = lq_sta->lq.reduced_tpc;
2019 int current_tpt;
2020 int weak, strong;
2021 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2022
2023 #ifdef CONFIG_MAC80211_DEBUGFS
2024 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2025 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2026 lq_sta->pers.dbg_fixed_txp_reduction);
2027 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2028 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2029 }
2030 #endif
2031
2032 rcu_read_lock();
2033 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2034 if (WARN_ON(!chanctx_conf))
2035 band = NUM_NL80211_BANDS;
2036 else
2037 band = chanctx_conf->def.chan->band;
2038 rcu_read_unlock();
2039
2040 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2041 IWL_DEBUG_RATE(mvm,
2042 "tpc is not allowed. remove txp restrictions\n");
2043 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2044 return cur != TPC_NO_REDUCTION;
2045 }
2046
2047 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2048
2049 /* Collect measured throughputs for current and adjacent rates */
2050 window = tbl->tpc_win;
2051 sr = window[cur].success_ratio;
2052 current_tpt = window[cur].average_tpt;
2053 if (weak != TPC_INVALID)
2054 weak_tpt = window[weak].average_tpt;
2055 if (strong != TPC_INVALID)
2056 strong_tpt = window[strong].average_tpt;
2057
2058 IWL_DEBUG_RATE(mvm,
2059 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2060 cur, current_tpt, sr, weak, strong,
2061 weak_tpt, strong_tpt);
2062
2063 action = rs_get_tpc_action(mvm, sr, weak, strong,
2064 current_tpt, weak_tpt, strong_tpt);
2065
2066 /* override actions if we are on the edge */
2067 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2068 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2069 action = TPC_ACTION_STAY;
2070 } else if (strong == TPC_INVALID &&
2071 (action == TPC_ACTION_INCREASE ||
2072 action == TPC_ACTION_NO_RESTIRCTION)) {
2073 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2074 action = TPC_ACTION_STAY;
2075 }
2076
2077 switch (action) {
2078 case TPC_ACTION_DECREASE:
2079 lq_sta->lq.reduced_tpc = weak;
2080 return true;
2081 case TPC_ACTION_INCREASE:
2082 lq_sta->lq.reduced_tpc = strong;
2083 return true;
2084 case TPC_ACTION_NO_RESTIRCTION:
2085 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2086 return true;
2087 case TPC_ACTION_STAY:
2088 /* do nothing */
2089 break;
2090 }
2091 return false;
2092 }
2093
2094 /*
2095 * Do rate scaling and search for new modulation mode.
2096 */
rs_rate_scale_perform(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,int tid,bool ndp)2097 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2098 struct ieee80211_sta *sta,
2099 struct iwl_lq_sta *lq_sta,
2100 int tid, bool ndp)
2101 {
2102 int low = IWL_RATE_INVALID;
2103 int high = IWL_RATE_INVALID;
2104 int index;
2105 struct iwl_rate_scale_data *window = NULL;
2106 int current_tpt = IWL_INVALID_VALUE;
2107 int low_tpt = IWL_INVALID_VALUE;
2108 int high_tpt = IWL_INVALID_VALUE;
2109 u32 fail_count;
2110 enum rs_action scale_action = RS_ACTION_STAY;
2111 u16 rate_mask;
2112 u8 update_lq = 0;
2113 struct iwl_scale_tbl_info *tbl, *tbl1;
2114 u8 active_tbl = 0;
2115 u8 done_search = 0;
2116 u16 high_low;
2117 s32 sr;
2118 u8 prev_agg = lq_sta->is_agg;
2119 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2120 struct rs_rate *rate;
2121
2122 lq_sta->is_agg = !!mvmsta->agg_tids;
2123
2124 /*
2125 * Select rate-scale / modulation-mode table to work with in
2126 * the rest of this function: "search" if searching for better
2127 * modulation mode, or "active" if doing rate scaling within a mode.
2128 */
2129 if (!lq_sta->search_better_tbl)
2130 active_tbl = lq_sta->active_tbl;
2131 else
2132 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2133
2134 tbl = &(lq_sta->lq_info[active_tbl]);
2135 rate = &tbl->rate;
2136
2137 if (prev_agg != lq_sta->is_agg) {
2138 IWL_DEBUG_RATE(mvm,
2139 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2140 prev_agg, lq_sta->is_agg);
2141 rs_set_expected_tpt_table(lq_sta, tbl);
2142 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2143 }
2144
2145 /* current tx rate */
2146 index = rate->index;
2147
2148 /* rates available for this association, and for modulation mode */
2149 rate_mask = rs_get_supported_rates(lq_sta, rate);
2150
2151 if (!(BIT(index) & rate_mask)) {
2152 IWL_ERR(mvm, "Current Rate is not valid\n");
2153 if (lq_sta->search_better_tbl) {
2154 /* revert to active table if search table is not valid*/
2155 rate->type = LQ_NONE;
2156 lq_sta->search_better_tbl = 0;
2157 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2158 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2159 }
2160 return;
2161 }
2162
2163 /* Get expected throughput table and history window for current rate */
2164 if (!tbl->expected_tpt) {
2165 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2166 return;
2167 }
2168
2169 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2170 window = &(tbl->win[index]);
2171
2172 /*
2173 * If there is not enough history to calculate actual average
2174 * throughput, keep analyzing results of more tx frames, without
2175 * changing rate or mode (bypass most of the rest of this function).
2176 * Set up new rate table in uCode only if old rate is not supported
2177 * in current association (use new rate found above).
2178 */
2179 fail_count = window->counter - window->success_counter;
2180 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2181 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2182 IWL_DEBUG_RATE(mvm,
2183 "%s: Test Window: succ %d total %d\n",
2184 rs_pretty_rate(rate),
2185 window->success_counter, window->counter);
2186
2187 /* Can't calculate this yet; not enough history */
2188 window->average_tpt = IWL_INVALID_VALUE;
2189
2190 /* Should we stay with this modulation mode,
2191 * or search for a new one? */
2192 rs_stay_in_table(lq_sta, false);
2193
2194 return;
2195 }
2196
2197 /* If we are searching for better modulation mode, check success. */
2198 if (lq_sta->search_better_tbl) {
2199 /* If good success, continue using the "search" mode;
2200 * no need to send new link quality command, since we're
2201 * continuing to use the setup that we've been trying. */
2202 if (window->average_tpt > lq_sta->last_tpt) {
2203 IWL_DEBUG_RATE(mvm,
2204 "SWITCHING TO NEW TABLE SR: %d "
2205 "cur-tpt %d old-tpt %d\n",
2206 window->success_ratio,
2207 window->average_tpt,
2208 lq_sta->last_tpt);
2209
2210 /* Swap tables; "search" becomes "active" */
2211 lq_sta->active_tbl = active_tbl;
2212 current_tpt = window->average_tpt;
2213 /* Else poor success; go back to mode in "active" table */
2214 } else {
2215 IWL_DEBUG_RATE(mvm,
2216 "GOING BACK TO THE OLD TABLE: SR %d "
2217 "cur-tpt %d old-tpt %d\n",
2218 window->success_ratio,
2219 window->average_tpt,
2220 lq_sta->last_tpt);
2221
2222 /* Nullify "search" table */
2223 rate->type = LQ_NONE;
2224
2225 /* Revert to "active" table */
2226 active_tbl = lq_sta->active_tbl;
2227 tbl = &(lq_sta->lq_info[active_tbl]);
2228
2229 /* Revert to "active" rate and throughput info */
2230 index = tbl->rate.index;
2231 current_tpt = lq_sta->last_tpt;
2232
2233 /* Need to set up a new rate table in uCode */
2234 update_lq = 1;
2235 }
2236
2237 /* Either way, we've made a decision; modulation mode
2238 * search is done, allow rate adjustment next time. */
2239 lq_sta->search_better_tbl = 0;
2240 done_search = 1; /* Don't switch modes below! */
2241 goto lq_update;
2242 }
2243
2244 /* (Else) not in search of better modulation mode, try for better
2245 * starting rate, while staying in this mode. */
2246 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2247 low = high_low & 0xff;
2248 high = (high_low >> 8) & 0xff;
2249
2250 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2251
2252 sr = window->success_ratio;
2253
2254 /* Collect measured throughputs for current and adjacent rates */
2255 current_tpt = window->average_tpt;
2256 if (low != IWL_RATE_INVALID)
2257 low_tpt = tbl->win[low].average_tpt;
2258 if (high != IWL_RATE_INVALID)
2259 high_tpt = tbl->win[high].average_tpt;
2260
2261 IWL_DEBUG_RATE(mvm,
2262 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2263 rs_pretty_rate(rate), current_tpt, sr,
2264 low, high, low_tpt, high_tpt);
2265
2266 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2267 current_tpt, low_tpt, high_tpt);
2268
2269 /* Force a search in case BT doesn't like us being in MIMO */
2270 if (is_mimo(rate) &&
2271 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2272 IWL_DEBUG_RATE(mvm,
2273 "BT Coex forbids MIMO. Search for new config\n");
2274 rs_stay_in_table(lq_sta, true);
2275 goto lq_update;
2276 }
2277
2278 switch (scale_action) {
2279 case RS_ACTION_DOWNSCALE:
2280 /* Decrease starting rate, update uCode's rate table */
2281 if (low != IWL_RATE_INVALID) {
2282 update_lq = 1;
2283 index = low;
2284 } else {
2285 IWL_DEBUG_RATE(mvm,
2286 "At the bottom rate. Can't decrease\n");
2287 }
2288
2289 break;
2290 case RS_ACTION_UPSCALE:
2291 /* Increase starting rate, update uCode's rate table */
2292 if (high != IWL_RATE_INVALID) {
2293 update_lq = 1;
2294 index = high;
2295 } else {
2296 IWL_DEBUG_RATE(mvm,
2297 "At the top rate. Can't increase\n");
2298 }
2299
2300 break;
2301 case RS_ACTION_STAY:
2302 /* No change */
2303 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2304 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2305 break;
2306 default:
2307 break;
2308 }
2309
2310 lq_update:
2311 /* Replace uCode's rate table for the destination station. */
2312 if (update_lq) {
2313 tbl->rate.index = index;
2314 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2315 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2316 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2317 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2318 }
2319
2320 rs_stay_in_table(lq_sta, false);
2321
2322 /*
2323 * Search for new modulation mode if we're:
2324 * 1) Not changing rates right now
2325 * 2) Not just finishing up a search
2326 * 3) Allowing a new search
2327 */
2328 if (!update_lq && !done_search &&
2329 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2330 && window->counter) {
2331 enum rs_column next_column;
2332
2333 /* Save current throughput to compare with "search" throughput*/
2334 lq_sta->last_tpt = current_tpt;
2335
2336 IWL_DEBUG_RATE(mvm,
2337 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2338 update_lq, done_search, lq_sta->rs_state,
2339 window->counter);
2340
2341 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2342 if (next_column != RS_COLUMN_INVALID) {
2343 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2344 next_column);
2345 if (!ret)
2346 lq_sta->search_better_tbl = 1;
2347 } else {
2348 IWL_DEBUG_RATE(mvm,
2349 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2350 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2351 }
2352
2353 /* If new "search" mode was selected, set up in uCode table */
2354 if (lq_sta->search_better_tbl) {
2355 /* Access the "search" table, clear its history. */
2356 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2357 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2358
2359 /* Use new "search" start rate */
2360 index = tbl->rate.index;
2361
2362 rs_dump_rate(mvm, &tbl->rate,
2363 "Switch to SEARCH TABLE:");
2364 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2365 } else {
2366 done_search = 1;
2367 }
2368 }
2369
2370 if (!ndp)
2371 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2372
2373 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2374 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2375 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2376 }
2377 }
2378
2379 struct rs_init_rate_info {
2380 s8 rssi;
2381 u8 rate_idx;
2382 };
2383
2384 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2385 { -60, IWL_RATE_54M_INDEX },
2386 { -64, IWL_RATE_48M_INDEX },
2387 { -68, IWL_RATE_36M_INDEX },
2388 { -80, IWL_RATE_24M_INDEX },
2389 { -84, IWL_RATE_18M_INDEX },
2390 { -85, IWL_RATE_12M_INDEX },
2391 { -86, IWL_RATE_11M_INDEX },
2392 { -88, IWL_RATE_5M_INDEX },
2393 { -90, IWL_RATE_2M_INDEX },
2394 { S8_MIN, IWL_RATE_1M_INDEX },
2395 };
2396
2397 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2398 { -60, IWL_RATE_54M_INDEX },
2399 { -64, IWL_RATE_48M_INDEX },
2400 { -72, IWL_RATE_36M_INDEX },
2401 { -80, IWL_RATE_24M_INDEX },
2402 { -84, IWL_RATE_18M_INDEX },
2403 { -85, IWL_RATE_12M_INDEX },
2404 { -87, IWL_RATE_9M_INDEX },
2405 { S8_MIN, IWL_RATE_6M_INDEX },
2406 };
2407
2408 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2409 { -60, IWL_RATE_MCS_7_INDEX },
2410 { -64, IWL_RATE_MCS_6_INDEX },
2411 { -68, IWL_RATE_MCS_5_INDEX },
2412 { -72, IWL_RATE_MCS_4_INDEX },
2413 { -80, IWL_RATE_MCS_3_INDEX },
2414 { -84, IWL_RATE_MCS_2_INDEX },
2415 { -85, IWL_RATE_MCS_1_INDEX },
2416 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2417 };
2418
2419 /* MCS index 9 is not valid for 20MHz VHT channel width,
2420 * but is ok for 40, 80 and 160MHz channels.
2421 */
2422 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2423 { -60, IWL_RATE_MCS_8_INDEX },
2424 { -64, IWL_RATE_MCS_7_INDEX },
2425 { -68, IWL_RATE_MCS_6_INDEX },
2426 { -72, IWL_RATE_MCS_5_INDEX },
2427 { -80, IWL_RATE_MCS_4_INDEX },
2428 { -84, IWL_RATE_MCS_3_INDEX },
2429 { -85, IWL_RATE_MCS_2_INDEX },
2430 { -87, IWL_RATE_MCS_1_INDEX },
2431 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2432 };
2433
2434 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2435 { -60, IWL_RATE_MCS_9_INDEX },
2436 { -64, IWL_RATE_MCS_8_INDEX },
2437 { -68, IWL_RATE_MCS_7_INDEX },
2438 { -72, IWL_RATE_MCS_6_INDEX },
2439 { -80, IWL_RATE_MCS_5_INDEX },
2440 { -84, IWL_RATE_MCS_4_INDEX },
2441 { -85, IWL_RATE_MCS_3_INDEX },
2442 { -87, IWL_RATE_MCS_2_INDEX },
2443 { -88, IWL_RATE_MCS_1_INDEX },
2444 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2445 };
2446
2447 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2448
2449 /* Init the optimal rate based on STA caps
2450 * This combined with rssi is used to report the last tx rate
2451 * to userspace when we haven't transmitted enough frames.
2452 */
rs_init_optimal_rate(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)2453 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2454 struct ieee80211_sta *sta,
2455 struct iwl_lq_sta *lq_sta)
2456 {
2457 struct rs_rate *rate = &lq_sta->optimal_rate;
2458
2459 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2460 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2461 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2462 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2463 else if (lq_sta->band == NL80211_BAND_5GHZ)
2464 rate->type = LQ_LEGACY_A;
2465 else
2466 rate->type = LQ_LEGACY_G;
2467
2468 rate->bw = rs_bw_from_sta_bw(sta);
2469 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2470
2471 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2472
2473 if (is_mimo(rate)) {
2474 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2475 } else if (is_siso(rate)) {
2476 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2477 } else {
2478 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2479
2480 if (lq_sta->band == NL80211_BAND_5GHZ) {
2481 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2482 lq_sta->optimal_nentries =
2483 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2484 } else {
2485 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2486 lq_sta->optimal_nentries =
2487 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2488 }
2489 }
2490
2491 if (is_vht(rate)) {
2492 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2493 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2494 lq_sta->optimal_nentries =
2495 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2496 } else {
2497 lq_sta->optimal_rates = rs_optimal_rates_vht;
2498 lq_sta->optimal_nentries =
2499 ARRAY_SIZE(rs_optimal_rates_vht);
2500 }
2501 } else if (is_ht(rate)) {
2502 lq_sta->optimal_rates = rs_optimal_rates_ht;
2503 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2504 }
2505 }
2506
2507 /* Compute the optimal rate index based on RSSI */
rs_get_optimal_rate(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta)2508 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2509 struct iwl_lq_sta *lq_sta)
2510 {
2511 struct rs_rate *rate = &lq_sta->optimal_rate;
2512 int i;
2513
2514 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2515 BITS_PER_LONG);
2516
2517 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2518 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2519
2520 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2521 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2522 rate->index = rate_idx;
2523 break;
2524 }
2525 }
2526
2527 return rate;
2528 }
2529
2530 /* Choose an initial legacy rate and antenna to use based on the RSSI
2531 * of last Rx
2532 */
rs_get_initial_rate(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,enum nl80211_band band,struct rs_rate * rate)2533 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2534 struct ieee80211_sta *sta,
2535 struct iwl_lq_sta *lq_sta,
2536 enum nl80211_band band,
2537 struct rs_rate *rate)
2538 {
2539 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2540 int i, nentries;
2541 unsigned long active_rate;
2542 s8 best_rssi = S8_MIN;
2543 u8 best_ant = ANT_NONE;
2544 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2545 const struct rs_init_rate_info *initial_rates;
2546
2547 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2548 if (!(lq_sta->pers.chains & BIT(i)))
2549 continue;
2550
2551 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2552 best_rssi = lq_sta->pers.chain_signal[i];
2553 best_ant = BIT(i);
2554 }
2555 }
2556
2557 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2558 rs_pretty_ant(best_ant), best_rssi);
2559
2560 if (best_ant != ANT_A && best_ant != ANT_B)
2561 rate->ant = first_antenna(valid_tx_ant);
2562 else
2563 rate->ant = best_ant;
2564
2565 rate->sgi = false;
2566 rate->ldpc = false;
2567 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2568
2569 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2570 BITS_PER_LONG);
2571
2572 if (band == NL80211_BAND_5GHZ) {
2573 rate->type = LQ_LEGACY_A;
2574 initial_rates = rs_optimal_rates_5ghz_legacy;
2575 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2576 } else {
2577 rate->type = LQ_LEGACY_G;
2578 initial_rates = rs_optimal_rates_24ghz_legacy;
2579 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2580 }
2581
2582 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2583 goto out;
2584
2585 /* Start from a higher rate if the corresponding debug capability
2586 * is enabled. The rate is chosen according to AP capabilities.
2587 * In case of VHT/HT when the rssi is low fallback to the case of
2588 * legacy rates.
2589 */
2590 if (sta->vht_cap.vht_supported &&
2591 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2592 /*
2593 * In AP mode, when a new station associates, rs is initialized
2594 * immediately upon association completion, before the phy
2595 * context is updated with the association parameters, so the
2596 * sta bandwidth might be wider than the phy context allows.
2597 * To avoid this issue, always initialize rs with 20mhz
2598 * bandwidth rate, and after authorization, when the phy context
2599 * is already up-to-date, re-init rs with the correct bw.
2600 */
2601 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2602 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2603
2604 switch (bw) {
2605 case RATE_MCS_CHAN_WIDTH_40:
2606 case RATE_MCS_CHAN_WIDTH_80:
2607 case RATE_MCS_CHAN_WIDTH_160:
2608 initial_rates = rs_optimal_rates_vht;
2609 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2610 break;
2611 case RATE_MCS_CHAN_WIDTH_20:
2612 initial_rates = rs_optimal_rates_vht_20mhz;
2613 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2614 break;
2615 default:
2616 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2617 goto out;
2618 }
2619
2620 active_rate = lq_sta->active_siso_rate;
2621 rate->type = LQ_VHT_SISO;
2622 rate->bw = bw;
2623 } else if (sta->ht_cap.ht_supported &&
2624 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2625 initial_rates = rs_optimal_rates_ht;
2626 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2627 active_rate = lq_sta->active_siso_rate;
2628 rate->type = LQ_HT_SISO;
2629 } else {
2630 active_rate = lq_sta->active_legacy_rate;
2631 }
2632
2633 for (i = 0; i < nentries; i++) {
2634 int rate_idx = initial_rates[i].rate_idx;
2635
2636 if ((best_rssi >= initial_rates[i].rssi) &&
2637 (BIT(rate_idx) & active_rate)) {
2638 rate->index = rate_idx;
2639 break;
2640 }
2641 }
2642
2643 out:
2644 rs_dump_rate(mvm, rate, "INITIAL");
2645 }
2646
2647 /* Save info about RSSI of last Rx */
rs_update_last_rssi(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,struct ieee80211_rx_status * rx_status)2648 void rs_update_last_rssi(struct iwl_mvm *mvm,
2649 struct iwl_mvm_sta *mvmsta,
2650 struct ieee80211_rx_status *rx_status)
2651 {
2652 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2653 int i;
2654
2655 lq_sta->pers.chains = rx_status->chains;
2656 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2657 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2658 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2659 lq_sta->pers.last_rssi = S8_MIN;
2660
2661 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2662 if (!(lq_sta->pers.chains & BIT(i)))
2663 continue;
2664
2665 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2666 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2667 }
2668 }
2669
2670 /**
2671 * rs_initialize_lq - Initialize a station's hardware rate table
2672 *
2673 * The uCode's station table contains a table of fallback rates
2674 * for automatic fallback during transmission.
2675 *
2676 * NOTE: This sets up a default set of values. These will be replaced later
2677 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2678 * rc80211_simple.
2679 *
2680 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2681 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2682 * which requires station table entry to exist).
2683 */
rs_initialize_lq(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,enum nl80211_band band)2684 static void rs_initialize_lq(struct iwl_mvm *mvm,
2685 struct ieee80211_sta *sta,
2686 struct iwl_lq_sta *lq_sta,
2687 enum nl80211_band band)
2688 {
2689 struct iwl_scale_tbl_info *tbl;
2690 struct rs_rate *rate;
2691 u8 active_tbl = 0;
2692
2693 if (!sta || !lq_sta)
2694 return;
2695
2696 if (!lq_sta->search_better_tbl)
2697 active_tbl = lq_sta->active_tbl;
2698 else
2699 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2700
2701 tbl = &(lq_sta->lq_info[active_tbl]);
2702 rate = &tbl->rate;
2703
2704 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2705 rs_init_optimal_rate(mvm, sta, lq_sta);
2706
2707 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2708 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2709 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2710 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2711
2712 tbl->column = rs_get_column_from_rate(rate);
2713
2714 rs_set_expected_tpt_table(lq_sta, tbl);
2715 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2716 /* TODO restore station should remember the lq cmd */
2717 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2718 }
2719
rs_drv_get_rate(void * mvm_r,struct ieee80211_sta * sta,void * mvm_sta,struct ieee80211_tx_rate_control * txrc)2720 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2721 void *mvm_sta,
2722 struct ieee80211_tx_rate_control *txrc)
2723 {
2724 struct iwl_op_mode *op_mode = mvm_r;
2725 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2726 struct sk_buff *skb = txrc->skb;
2727 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2728 struct iwl_lq_sta *lq_sta;
2729 struct rs_rate *optimal_rate;
2730 u32 last_ucode_rate;
2731
2732 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2733 /* if vif isn't initialized mvm doesn't know about
2734 * this station, so don't do anything with the it
2735 */
2736 sta = NULL;
2737 mvm_sta = NULL;
2738 }
2739
2740 if (!mvm_sta)
2741 return;
2742
2743 lq_sta = mvm_sta;
2744 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2745 info->band, &info->control.rates[0]);
2746 info->control.rates[0].count = 1;
2747
2748 /* Report the optimal rate based on rssi and STA caps if we haven't
2749 * converged yet (too little traffic) or exploring other modulations
2750 */
2751 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2752 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2753 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2754 optimal_rate);
2755 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2756 &txrc->reported_rate);
2757 }
2758 }
2759
rs_drv_alloc_sta(void * mvm_rate,struct ieee80211_sta * sta,gfp_t gfp)2760 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2761 gfp_t gfp)
2762 {
2763 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2764 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2765 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2766 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2767
2768 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2769
2770 lq_sta->pers.drv = mvm;
2771 #ifdef CONFIG_MAC80211_DEBUGFS
2772 lq_sta->pers.dbg_fixed_rate = 0;
2773 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2774 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2775 #endif
2776 lq_sta->pers.chains = 0;
2777 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2778 lq_sta->pers.last_rssi = S8_MIN;
2779
2780 return lq_sta;
2781 }
2782
rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap * vht_cap,int nss)2783 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2784 int nss)
2785 {
2786 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2787 (0x3 << (2 * (nss - 1)));
2788 rx_mcs >>= (2 * (nss - 1));
2789
2790 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2791 return IWL_RATE_MCS_7_INDEX;
2792 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2793 return IWL_RATE_MCS_8_INDEX;
2794 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2795 return IWL_RATE_MCS_9_INDEX;
2796
2797 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2798 return -1;
2799 }
2800
rs_vht_set_enabled_rates(struct ieee80211_sta * sta,struct ieee80211_sta_vht_cap * vht_cap,struct iwl_lq_sta * lq_sta)2801 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2802 struct ieee80211_sta_vht_cap *vht_cap,
2803 struct iwl_lq_sta *lq_sta)
2804 {
2805 int i;
2806 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2807
2808 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2809 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2810 if (i == IWL_RATE_9M_INDEX)
2811 continue;
2812
2813 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2814 if (i == IWL_RATE_MCS_9_INDEX &&
2815 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2816 continue;
2817
2818 lq_sta->active_siso_rate |= BIT(i);
2819 }
2820 }
2821
2822 if (sta->rx_nss < 2)
2823 return;
2824
2825 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2826 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2827 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2828 if (i == IWL_RATE_9M_INDEX)
2829 continue;
2830
2831 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2832 if (i == IWL_RATE_MCS_9_INDEX &&
2833 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2834 continue;
2835
2836 lq_sta->active_mimo2_rate |= BIT(i);
2837 }
2838 }
2839 }
2840
rs_ht_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct ieee80211_sta_ht_cap * ht_cap)2841 static void rs_ht_init(struct iwl_mvm *mvm,
2842 struct ieee80211_sta *sta,
2843 struct iwl_lq_sta *lq_sta,
2844 struct ieee80211_sta_ht_cap *ht_cap)
2845 {
2846 /* active_siso_rate mask includes 9 MBits (bit 5),
2847 * and CCK (bits 0-3), supp_rates[] does not;
2848 * shift to convert format, force 9 MBits off.
2849 */
2850 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2851 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2852 lq_sta->active_siso_rate &= ~((u16)0x2);
2853 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2854
2855 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2856 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2857 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2858 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2859
2860 if (mvm->cfg->ht_params->ldpc &&
2861 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2862 lq_sta->ldpc = true;
2863
2864 if (mvm->cfg->ht_params->stbc &&
2865 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2866 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2867 lq_sta->stbc_capable = true;
2868
2869 lq_sta->is_vht = false;
2870 }
2871
rs_vht_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct ieee80211_sta_vht_cap * vht_cap)2872 static void rs_vht_init(struct iwl_mvm *mvm,
2873 struct ieee80211_sta *sta,
2874 struct iwl_lq_sta *lq_sta,
2875 struct ieee80211_sta_vht_cap *vht_cap)
2876 {
2877 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2878
2879 if (mvm->cfg->ht_params->ldpc &&
2880 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2881 lq_sta->ldpc = true;
2882
2883 if (mvm->cfg->ht_params->stbc &&
2884 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2885 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2886 lq_sta->stbc_capable = true;
2887
2888 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2889 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2890 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2891 lq_sta->bfer_capable = true;
2892
2893 lq_sta->is_vht = true;
2894 }
2895
2896 #ifdef CONFIG_IWLWIFI_DEBUGFS
iwl_mvm_reset_frame_stats(struct iwl_mvm * mvm)2897 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2898 {
2899 spin_lock_bh(&mvm->drv_stats_lock);
2900 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2901 spin_unlock_bh(&mvm->drv_stats_lock);
2902 }
2903
iwl_mvm_update_frame_stats(struct iwl_mvm * mvm,u32 rate,bool agg)2904 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2905 {
2906 u8 nss = 0;
2907
2908 spin_lock(&mvm->drv_stats_lock);
2909
2910 if (agg)
2911 mvm->drv_rx_stats.agg_frames++;
2912
2913 mvm->drv_rx_stats.success_frames++;
2914
2915 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2916 case RATE_MCS_CHAN_WIDTH_20:
2917 mvm->drv_rx_stats.bw_20_frames++;
2918 break;
2919 case RATE_MCS_CHAN_WIDTH_40:
2920 mvm->drv_rx_stats.bw_40_frames++;
2921 break;
2922 case RATE_MCS_CHAN_WIDTH_80:
2923 mvm->drv_rx_stats.bw_80_frames++;
2924 break;
2925 case RATE_MCS_CHAN_WIDTH_160:
2926 mvm->drv_rx_stats.bw_160_frames++;
2927 break;
2928 default:
2929 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2930 }
2931
2932 if (rate & RATE_MCS_HT_MSK) {
2933 mvm->drv_rx_stats.ht_frames++;
2934 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2935 } else if (rate & RATE_MCS_VHT_MSK) {
2936 mvm->drv_rx_stats.vht_frames++;
2937 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2938 RATE_VHT_MCS_NSS_POS) + 1;
2939 } else {
2940 mvm->drv_rx_stats.legacy_frames++;
2941 }
2942
2943 if (nss == 1)
2944 mvm->drv_rx_stats.siso_frames++;
2945 else if (nss == 2)
2946 mvm->drv_rx_stats.mimo2_frames++;
2947
2948 if (rate & RATE_MCS_SGI_MSK)
2949 mvm->drv_rx_stats.sgi_frames++;
2950 else
2951 mvm->drv_rx_stats.ngi_frames++;
2952
2953 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2954 mvm->drv_rx_stats.last_frame_idx =
2955 (mvm->drv_rx_stats.last_frame_idx + 1) %
2956 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2957
2958 spin_unlock(&mvm->drv_stats_lock);
2959 }
2960 #endif
2961
2962 /*
2963 * Called after adding a new station to initialize rate scaling
2964 */
rs_drv_rate_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,enum nl80211_band band)2965 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2966 enum nl80211_band band)
2967 {
2968 int i, j;
2969 struct ieee80211_hw *hw = mvm->hw;
2970 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2971 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2972 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2973 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2974 struct ieee80211_supported_band *sband;
2975 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2976
2977 lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock);
2978
2979 /* clear all non-persistent lq data */
2980 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2981
2982 sband = hw->wiphy->bands[band];
2983
2984 lq_sta->lq.sta_id = mvmsta->sta_id;
2985 mvmsta->amsdu_enabled = 0;
2986 mvmsta->max_amsdu_len = sta->max_amsdu_len;
2987
2988 for (j = 0; j < LQ_SIZE; j++)
2989 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2990
2991 lq_sta->flush_timer = 0;
2992 lq_sta->last_tx = jiffies;
2993
2994 IWL_DEBUG_RATE(mvm,
2995 "LQ: *** rate scale station global init for station %d ***\n",
2996 mvmsta->sta_id);
2997 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2998 * the lowest or the highest rate.. Could consider using RSSI from
2999 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3000 * after assoc.. */
3001
3002 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3003 lq_sta->band = sband->band;
3004 /*
3005 * active legacy rates as per supported rates bitmap
3006 */
3007 supp = sta->supp_rates[sband->band];
3008 lq_sta->active_legacy_rate = 0;
3009 for_each_set_bit(i, &supp, BITS_PER_LONG)
3010 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3011
3012 /* TODO: should probably account for rx_highest for both HT/VHT */
3013 if (!vht_cap || !vht_cap->vht_supported)
3014 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3015 else
3016 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3017
3018 lq_sta->max_legacy_rate_idx =
3019 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3020 lq_sta->max_siso_rate_idx =
3021 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3022 lq_sta->max_mimo2_rate_idx =
3023 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3024
3025 IWL_DEBUG_RATE(mvm,
3026 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3027 lq_sta->active_legacy_rate,
3028 lq_sta->active_siso_rate,
3029 lq_sta->active_mimo2_rate,
3030 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3031 lq_sta->bfer_capable);
3032 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3033 lq_sta->max_legacy_rate_idx,
3034 lq_sta->max_siso_rate_idx,
3035 lq_sta->max_mimo2_rate_idx);
3036
3037 /* These values will be overridden later */
3038 lq_sta->lq.single_stream_ant_msk =
3039 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
3040 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3041
3042 /* as default allow aggregation for all tids */
3043 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3044 lq_sta->is_agg = 0;
3045 #ifdef CONFIG_IWLWIFI_DEBUGFS
3046 iwl_mvm_reset_frame_stats(mvm);
3047 #endif
3048 rs_initialize_lq(mvm, sta, lq_sta, band);
3049 }
3050
rs_drv_rate_update(void * mvm_r,struct ieee80211_supported_band * sband,struct cfg80211_chan_def * chandef,struct ieee80211_sta * sta,void * priv_sta,u32 changed)3051 static void rs_drv_rate_update(void *mvm_r,
3052 struct ieee80211_supported_band *sband,
3053 struct cfg80211_chan_def *chandef,
3054 struct ieee80211_sta *sta,
3055 void *priv_sta, u32 changed)
3056 {
3057 struct iwl_op_mode *op_mode = mvm_r;
3058 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3059 u8 tid;
3060
3061 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3062 return;
3063
3064 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3065 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3066 ieee80211_stop_tx_ba_session(sta, tid);
3067
3068 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3069 }
3070
__iwl_mvm_rs_tx_status(struct iwl_mvm * mvm,struct ieee80211_sta * sta,int tid,struct ieee80211_tx_info * info,bool ndp)3071 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3072 struct ieee80211_sta *sta,
3073 int tid, struct ieee80211_tx_info *info,
3074 bool ndp)
3075 {
3076 int legacy_success;
3077 int retries;
3078 int i;
3079 struct iwl_lq_cmd *table;
3080 u32 lq_hwrate;
3081 struct rs_rate lq_rate, tx_resp_rate;
3082 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3083 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3084 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3085 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3086 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3087 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3088 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3089
3090 if (!lq_sta->pers.drv) {
3091 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3092 return;
3093 }
3094
3095 /* This packet was aggregated but doesn't carry status info */
3096 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3097 !(info->flags & IEEE80211_TX_STAT_AMPDU))
3098 return;
3099
3100 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3101 &tx_resp_rate)) {
3102 WARN_ON_ONCE(1);
3103 return;
3104 }
3105
3106 #ifdef CONFIG_MAC80211_DEBUGFS
3107 /* Disable last tx check if we are debugging with fixed rate but
3108 * update tx stats
3109 */
3110 if (lq_sta->pers.dbg_fixed_rate) {
3111 int index = tx_resp_rate.index;
3112 enum rs_column column;
3113 int attempts, success;
3114
3115 column = rs_get_column_from_rate(&tx_resp_rate);
3116 if (WARN_ONCE(column == RS_COLUMN_INVALID,
3117 "Can't map rate 0x%x to column",
3118 tx_resp_hwrate))
3119 return;
3120
3121 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3122 attempts = info->status.ampdu_len;
3123 success = info->status.ampdu_ack_len;
3124 } else {
3125 attempts = info->status.rates[0].count;
3126 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3127 }
3128
3129 lq_sta->pers.tx_stats[column][index].total += attempts;
3130 lq_sta->pers.tx_stats[column][index].success += success;
3131
3132 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3133 tx_resp_hwrate, success, attempts);
3134 return;
3135 }
3136 #endif
3137
3138 if (time_after(jiffies,
3139 (unsigned long)(lq_sta->last_tx +
3140 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3141 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3142 /* reach here only in case of driver RS, call directly
3143 * the unlocked version
3144 */
3145 rs_drv_rate_init(mvm, sta, info->band);
3146 return;
3147 }
3148 lq_sta->last_tx = jiffies;
3149
3150 /* Ignore this Tx frame response if its initial rate doesn't match
3151 * that of latest Link Quality command. There may be stragglers
3152 * from a previous Link Quality command, but we're no longer interested
3153 * in those; they're either from the "active" mode while we're trying
3154 * to check "search" mode, or a prior "search" mode after we've moved
3155 * to a new "search" mode (which might become the new "active" mode).
3156 */
3157 table = &lq_sta->lq;
3158 lq_hwrate = le32_to_cpu(table->rs_table[0]);
3159 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3160 WARN_ON_ONCE(1);
3161 return;
3162 }
3163
3164 /* Here we actually compare this rate to the latest LQ command */
3165 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3166 IWL_DEBUG_RATE(mvm,
3167 "tx resp color 0x%x does not match 0x%x\n",
3168 lq_color, LQ_FLAG_COLOR_GET(table->flags));
3169
3170 /* Since rates mis-match, the last LQ command may have failed.
3171 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3172 * ... driver.
3173 */
3174 lq_sta->missed_rate_counter++;
3175 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3176 lq_sta->missed_rate_counter = 0;
3177 IWL_DEBUG_RATE(mvm,
3178 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3179 lq_sta->rs_state);
3180 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3181 }
3182 /* Regardless, ignore this status info for outdated rate */
3183 return;
3184 }
3185
3186 /* Rate did match, so reset the missed_rate_counter */
3187 lq_sta->missed_rate_counter = 0;
3188
3189 if (!lq_sta->search_better_tbl) {
3190 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3191 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3192 } else {
3193 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3194 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3195 }
3196
3197 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3198 IWL_DEBUG_RATE(mvm,
3199 "Neither active nor search matches tx rate\n");
3200 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3201 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3202 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3203 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3204 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3205
3206 /* no matching table found, let's by-pass the data collection
3207 * and continue to perform rate scale to find the rate table
3208 */
3209 rs_stay_in_table(lq_sta, true);
3210 goto done;
3211 }
3212
3213 /* Updating the frame history depends on whether packets were
3214 * aggregated.
3215 *
3216 * For aggregation, all packets were transmitted at the same rate, the
3217 * first index into rate scale table.
3218 */
3219 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3220 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3221 info->status.ampdu_len,
3222 info->status.ampdu_ack_len,
3223 reduced_txp);
3224
3225 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3226 * it as a single frame loss as we don't want the success ratio
3227 * to dip too quickly because a BA wasn't received.
3228 * For TPC, there's no need for this optimisation since we want
3229 * to recover very quickly from a bad power reduction and,
3230 * therefore we'd like the success ratio to get an immediate hit
3231 * when failing to get a BA, so we'd switch back to a lower or
3232 * zero power reduction. When FW transmits agg with a rate
3233 * different from the initial rate, it will not use reduced txp
3234 * and will send BA notification twice (one empty with reduced
3235 * txp equal to the value from LQ and one with reduced txp 0).
3236 * We need to update counters for each txp level accordingly.
3237 */
3238 if (info->status.ampdu_ack_len == 0)
3239 info->status.ampdu_len = 1;
3240
3241 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3242 tx_resp_rate.index,
3243 info->status.ampdu_len,
3244 info->status.ampdu_ack_len);
3245
3246 /* Update success/fail counts if not searching for new mode */
3247 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3248 lq_sta->total_success += info->status.ampdu_ack_len;
3249 lq_sta->total_failed += (info->status.ampdu_len -
3250 info->status.ampdu_ack_len);
3251 }
3252 } else {
3253 /* For legacy, update frame history with for each Tx retry. */
3254 retries = info->status.rates[0].count - 1;
3255 /* HW doesn't send more than 15 retries */
3256 retries = min(retries, 15);
3257
3258 /* The last transmission may have been successful */
3259 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3260 /* Collect data for each rate used during failed TX attempts */
3261 for (i = 0; i <= retries; ++i) {
3262 lq_hwrate = le32_to_cpu(table->rs_table[i]);
3263 if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3264 &lq_rate)) {
3265 WARN_ON_ONCE(1);
3266 return;
3267 }
3268
3269 /* Only collect stats if retried rate is in the same RS
3270 * table as active/search.
3271 */
3272 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3273 tmp_tbl = curr_tbl;
3274 else if (rs_rate_column_match(&lq_rate,
3275 &other_tbl->rate))
3276 tmp_tbl = other_tbl;
3277 else
3278 continue;
3279
3280 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3281 tx_resp_rate.index, 1,
3282 i < retries ? 0 : legacy_success,
3283 reduced_txp);
3284 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3285 tx_resp_rate.index, 1,
3286 i < retries ? 0 : legacy_success);
3287 }
3288
3289 /* Update success/fail counts if not searching for new mode */
3290 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3291 lq_sta->total_success += legacy_success;
3292 lq_sta->total_failed += retries + (1 - legacy_success);
3293 }
3294 }
3295 /* The last TX rate is cached in lq_sta; it's set in if/else above */
3296 lq_sta->last_rate_n_flags = lq_hwrate;
3297 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3298 done:
3299 /* See if there's a better rate or modulation mode to try. */
3300 if (sta->supp_rates[info->band])
3301 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3302 }
3303
iwl_mvm_rs_tx_status(struct iwl_mvm * mvm,struct ieee80211_sta * sta,int tid,struct ieee80211_tx_info * info,bool ndp)3304 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3305 int tid, struct ieee80211_tx_info *info, bool ndp)
3306 {
3307 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3308
3309 /* If it's locked we are in middle of init flow
3310 * just wait for next tx status to update the lq_sta data
3311 */
3312 if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock))
3313 return;
3314
3315 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3316 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
3317 }
3318
3319 #ifdef CONFIG_MAC80211_DEBUGFS
rs_build_rates_table_from_fixed(struct iwl_mvm * mvm,struct iwl_lq_cmd * lq_cmd,enum nl80211_band band,u32 ucode_rate)3320 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3321 struct iwl_lq_cmd *lq_cmd,
3322 enum nl80211_band band,
3323 u32 ucode_rate)
3324 {
3325 struct rs_rate rate;
3326 int i;
3327 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3328 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3329 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3330
3331 for (i = 0; i < num_rates; i++)
3332 lq_cmd->rs_table[i] = ucode_rate_le32;
3333
3334 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3335 WARN_ON_ONCE(1);
3336 return;
3337 }
3338
3339 if (is_mimo(&rate))
3340 lq_cmd->mimo_delim = num_rates - 1;
3341 else
3342 lq_cmd->mimo_delim = 0;
3343
3344 lq_cmd->reduced_tpc = 0;
3345
3346 if (num_of_ant(ant) == 1)
3347 lq_cmd->single_stream_ant_msk = ant;
3348
3349 if (!mvm->trans->trans_cfg->gen2)
3350 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3351 else
3352 lq_cmd->agg_frame_cnt_limit =
3353 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3354 }
3355 #endif /* CONFIG_MAC80211_DEBUGFS */
3356
rs_fill_rates_for_column(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct rs_rate * rate,__le32 * rs_table,int * rs_table_index,int num_rates,int num_retries,u8 valid_tx_ant,bool toggle_ant)3357 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3358 struct iwl_lq_sta *lq_sta,
3359 struct rs_rate *rate,
3360 __le32 *rs_table, int *rs_table_index,
3361 int num_rates, int num_retries,
3362 u8 valid_tx_ant, bool toggle_ant)
3363 {
3364 int i, j;
3365 __le32 ucode_rate;
3366 bool bottom_reached = false;
3367 int prev_rate_idx = rate->index;
3368 int end = LINK_QUAL_MAX_RETRY_NUM;
3369 int index = *rs_table_index;
3370
3371 for (i = 0; i < num_rates && index < end; i++) {
3372 for (j = 0; j < num_retries && index < end; j++, index++) {
3373 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3374 rate));
3375 rs_table[index] = ucode_rate;
3376 if (toggle_ant)
3377 rs_toggle_antenna(valid_tx_ant, rate);
3378 }
3379
3380 prev_rate_idx = rate->index;
3381 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3382 if (bottom_reached && !is_legacy(rate))
3383 break;
3384 }
3385
3386 if (!bottom_reached && !is_legacy(rate))
3387 rate->index = prev_rate_idx;
3388
3389 *rs_table_index = index;
3390 }
3391
3392 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3393 * column the rate table should look like this:
3394 *
3395 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3396 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3397 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3398 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3399 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3400 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3401 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3402 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3403 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3404 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3405 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3406 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3407 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3408 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3409 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3410 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3411 */
rs_build_rates_table(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,const struct rs_rate * initial_rate)3412 static void rs_build_rates_table(struct iwl_mvm *mvm,
3413 struct ieee80211_sta *sta,
3414 struct iwl_lq_sta *lq_sta,
3415 const struct rs_rate *initial_rate)
3416 {
3417 struct rs_rate rate;
3418 int num_rates, num_retries, index = 0;
3419 u8 valid_tx_ant = 0;
3420 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3421 bool toggle_ant = false;
3422 u32 color;
3423
3424 memcpy(&rate, initial_rate, sizeof(rate));
3425
3426 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3427
3428 /* TODO: remove old API when min FW API hits 14 */
3429 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3430 rs_stbc_allow(mvm, sta, lq_sta))
3431 rate.stbc = true;
3432
3433 if (is_siso(&rate)) {
3434 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3435 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3436 } else if (is_mimo(&rate)) {
3437 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3438 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3439 } else {
3440 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3441 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3442 toggle_ant = true;
3443 }
3444
3445 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3446 num_rates, num_retries, valid_tx_ant,
3447 toggle_ant);
3448
3449 rs_get_lower_rate_down_column(lq_sta, &rate);
3450
3451 if (is_siso(&rate)) {
3452 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3453 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3454 lq_cmd->mimo_delim = index;
3455 } else if (is_legacy(&rate)) {
3456 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3457 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3458 } else {
3459 WARN_ON_ONCE(1);
3460 }
3461
3462 toggle_ant = true;
3463
3464 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3465 num_rates, num_retries, valid_tx_ant,
3466 toggle_ant);
3467
3468 rs_get_lower_rate_down_column(lq_sta, &rate);
3469
3470 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3471 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3472
3473 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3474 num_rates, num_retries, valid_tx_ant,
3475 toggle_ant);
3476
3477 /* update the color of the LQ command (as a counter at bits 1-3) */
3478 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3479 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3480 }
3481
3482 struct rs_bfer_active_iter_data {
3483 struct ieee80211_sta *exclude_sta;
3484 struct iwl_mvm_sta *bfer_mvmsta;
3485 };
3486
rs_bfer_active_iter(void * _data,struct ieee80211_sta * sta)3487 static void rs_bfer_active_iter(void *_data,
3488 struct ieee80211_sta *sta)
3489 {
3490 struct rs_bfer_active_iter_data *data = _data;
3491 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3492 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3493 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3494
3495 if (sta == data->exclude_sta)
3496 return;
3497
3498 /* The current sta has BFER allowed */
3499 if (ss_params & LQ_SS_BFER_ALLOWED) {
3500 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3501
3502 data->bfer_mvmsta = mvmsta;
3503 }
3504 }
3505
rs_bfer_priority(struct iwl_mvm_sta * sta)3506 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3507 {
3508 int prio = -1;
3509 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3510
3511 switch (viftype) {
3512 case NL80211_IFTYPE_AP:
3513 case NL80211_IFTYPE_P2P_GO:
3514 prio = 3;
3515 break;
3516 case NL80211_IFTYPE_P2P_CLIENT:
3517 prio = 2;
3518 break;
3519 case NL80211_IFTYPE_STATION:
3520 prio = 1;
3521 break;
3522 default:
3523 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3524 prio = -1;
3525 }
3526
3527 return prio;
3528 }
3529
3530 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
rs_bfer_priority_cmp(struct iwl_mvm_sta * sta1,struct iwl_mvm_sta * sta2)3531 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3532 struct iwl_mvm_sta *sta2)
3533 {
3534 int prio1 = rs_bfer_priority(sta1);
3535 int prio2 = rs_bfer_priority(sta2);
3536
3537 if (prio1 > prio2)
3538 return 1;
3539 if (prio1 < prio2)
3540 return -1;
3541 return 0;
3542 }
3543
rs_set_lq_ss_params(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,const struct rs_rate * initial_rate)3544 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3545 struct ieee80211_sta *sta,
3546 struct iwl_lq_sta *lq_sta,
3547 const struct rs_rate *initial_rate)
3548 {
3549 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3550 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3551 struct rs_bfer_active_iter_data data = {
3552 .exclude_sta = sta,
3553 .bfer_mvmsta = NULL,
3554 };
3555 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3556 u32 ss_params = LQ_SS_PARAMS_VALID;
3557
3558 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3559 goto out;
3560
3561 #ifdef CONFIG_MAC80211_DEBUGFS
3562 /* Check if forcing the decision is configured.
3563 * Note that SISO is forced by not allowing STBC or BFER
3564 */
3565 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3566 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3567 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3568 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3569
3570 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3571 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3572 lq_sta->pers.ss_force);
3573 goto out;
3574 }
3575 #endif
3576
3577 if (lq_sta->stbc_capable)
3578 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3579
3580 if (!lq_sta->bfer_capable)
3581 goto out;
3582
3583 ieee80211_iterate_stations_atomic(mvm->hw,
3584 rs_bfer_active_iter,
3585 &data);
3586 bfer_mvmsta = data.bfer_mvmsta;
3587
3588 /* This code is safe as it doesn't run concurrently for different
3589 * stations. This is guaranteed by the fact that calls to
3590 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3591 */
3592 if (!bfer_mvmsta) {
3593 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3594
3595 ss_params |= LQ_SS_BFER_ALLOWED;
3596 goto out;
3597 }
3598
3599 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3600 bfer_mvmsta->sta_id);
3601
3602 /* Disallow BFER on another STA if active and we're a higher priority */
3603 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3604 struct iwl_lq_cmd *bfersta_lq_cmd =
3605 &bfer_mvmsta->lq_sta.rs_drv.lq;
3606 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3607
3608 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3609 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3610 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3611
3612 ss_params |= LQ_SS_BFER_ALLOWED;
3613 IWL_DEBUG_RATE(mvm,
3614 "Lower priority BFER sta found (%d). Switch BFER\n",
3615 bfer_mvmsta->sta_id);
3616 }
3617 out:
3618 lq_cmd->ss_params = cpu_to_le32(ss_params);
3619 }
3620
rs_fill_lq_cmd(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,const struct rs_rate * initial_rate)3621 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3622 struct ieee80211_sta *sta,
3623 struct iwl_lq_sta *lq_sta,
3624 const struct rs_rate *initial_rate)
3625 {
3626 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3627 struct iwl_mvm_sta *mvmsta;
3628 struct iwl_mvm_vif *mvmvif;
3629
3630 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3631 lq_cmd->agg_time_limit =
3632 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3633
3634 #ifdef CONFIG_MAC80211_DEBUGFS
3635 if (lq_sta->pers.dbg_fixed_rate) {
3636 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3637 lq_sta->band,
3638 lq_sta->pers.dbg_fixed_rate);
3639 return;
3640 }
3641 #endif
3642 if (WARN_ON_ONCE(!sta || !initial_rate))
3643 return;
3644
3645 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3646
3647 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3648 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3649
3650 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3651 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3652
3653 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3654 num_of_ant(initial_rate->ant) == 1)
3655 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3656
3657 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3658
3659 /*
3660 * In case of low latency, tell the firmware to leave a frame in the
3661 * Tx Fifo so that it can start a transaction in the same TxOP. This
3662 * basically allows the firmware to send bursts.
3663 */
3664 if (iwl_mvm_vif_low_latency(mvmvif))
3665 lq_cmd->agg_frame_cnt_limit--;
3666
3667 if (mvmsta->vif->p2p)
3668 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3669
3670 lq_cmd->agg_time_limit =
3671 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3672 }
3673
rs_alloc(struct ieee80211_hw * hw)3674 static void *rs_alloc(struct ieee80211_hw *hw)
3675 {
3676 return hw->priv;
3677 }
3678
3679 /* rate scale requires free function to be implemented */
rs_free(void * mvm_rate)3680 static void rs_free(void *mvm_rate)
3681 {
3682 return;
3683 }
3684
rs_free_sta(void * mvm_r,struct ieee80211_sta * sta,void * mvm_sta)3685 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3686 {
3687 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3688 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3689
3690 IWL_DEBUG_RATE(mvm, "enter\n");
3691 IWL_DEBUG_RATE(mvm, "leave\n");
3692 }
3693
rs_pretty_print_rate(char * buf,int bufsz,const u32 rate)3694 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3695 {
3696
3697 char *type, *bw;
3698 u8 mcs = 0, nss = 0;
3699 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3700
3701 if (!(rate & RATE_MCS_HT_MSK) &&
3702 !(rate & RATE_MCS_VHT_MSK) &&
3703 !(rate & RATE_MCS_HE_MSK)) {
3704 int index = iwl_hwrate_to_plcp_idx(rate);
3705
3706 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3707 rs_pretty_ant(ant),
3708 index == IWL_RATE_INVALID ? "BAD" :
3709 iwl_rate_mcs[index].mbps);
3710 }
3711
3712 if (rate & RATE_MCS_VHT_MSK) {
3713 type = "VHT";
3714 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3715 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3716 >> RATE_VHT_MCS_NSS_POS) + 1;
3717 } else if (rate & RATE_MCS_HT_MSK) {
3718 type = "HT";
3719 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3720 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3721 >> RATE_HT_MCS_NSS_POS) + 1;
3722 } else if (rate & RATE_MCS_HE_MSK) {
3723 type = "HE";
3724 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3725 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3726 >> RATE_VHT_MCS_NSS_POS) + 1;
3727 } else {
3728 type = "Unknown"; /* shouldn't happen */
3729 }
3730
3731 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3732 case RATE_MCS_CHAN_WIDTH_20:
3733 bw = "20Mhz";
3734 break;
3735 case RATE_MCS_CHAN_WIDTH_40:
3736 bw = "40Mhz";
3737 break;
3738 case RATE_MCS_CHAN_WIDTH_80:
3739 bw = "80Mhz";
3740 break;
3741 case RATE_MCS_CHAN_WIDTH_160:
3742 bw = "160Mhz";
3743 break;
3744 default:
3745 bw = "BAD BW";
3746 }
3747
3748 return scnprintf(buf, bufsz,
3749 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s",
3750 rate, type, rs_pretty_ant(ant), bw, mcs, nss,
3751 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3752 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3753 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3754 (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "",
3755 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3756 }
3757
3758 #ifdef CONFIG_MAC80211_DEBUGFS
3759 /**
3760 * Program the device to use fixed rate for frame transmit
3761 * This is for debugging/testing only
3762 * once the device start use fixed rate, we need to reload the module
3763 * to being back the normal operation.
3764 */
rs_program_fix_rate(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta)3765 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3766 struct iwl_lq_sta *lq_sta)
3767 {
3768 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3769 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3770 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3771
3772 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3773 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3774
3775 if (lq_sta->pers.dbg_fixed_rate) {
3776 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3777 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3778 }
3779 }
3780
rs_sta_dbgfs_scale_table_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)3781 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3782 const char __user *user_buf, size_t count, loff_t *ppos)
3783 {
3784 struct iwl_lq_sta *lq_sta = file->private_data;
3785 struct iwl_mvm *mvm;
3786 char buf[64];
3787 size_t buf_size;
3788 u32 parsed_rate;
3789
3790 mvm = lq_sta->pers.drv;
3791 memset(buf, 0, sizeof(buf));
3792 buf_size = min(count, sizeof(buf) - 1);
3793 if (copy_from_user(buf, user_buf, buf_size))
3794 return -EFAULT;
3795
3796 if (sscanf(buf, "%x", &parsed_rate) == 1)
3797 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3798 else
3799 lq_sta->pers.dbg_fixed_rate = 0;
3800
3801 rs_program_fix_rate(mvm, lq_sta);
3802
3803 return count;
3804 }
3805
rs_sta_dbgfs_scale_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3806 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3807 char __user *user_buf, size_t count, loff_t *ppos)
3808 {
3809 char *buff;
3810 int desc = 0;
3811 int i = 0;
3812 ssize_t ret;
3813 static const size_t bufsz = 2048;
3814
3815 struct iwl_lq_sta *lq_sta = file->private_data;
3816 struct iwl_mvm_sta *mvmsta =
3817 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3818 struct iwl_mvm *mvm;
3819 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3820 struct rs_rate *rate = &tbl->rate;
3821 u32 ss_params;
3822
3823 mvm = lq_sta->pers.drv;
3824 buff = kmalloc(bufsz, GFP_KERNEL);
3825 if (!buff)
3826 return -ENOMEM;
3827
3828 desc += scnprintf(buff + desc, bufsz - desc,
3829 "sta_id %d\n", lq_sta->lq.sta_id);
3830 desc += scnprintf(buff + desc, bufsz - desc,
3831 "failed=%d success=%d rate=0%lX\n",
3832 lq_sta->total_failed, lq_sta->total_success,
3833 lq_sta->active_legacy_rate);
3834 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3835 lq_sta->pers.dbg_fixed_rate);
3836 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3837 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3838 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3839 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3840 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3841 (is_legacy(rate)) ? "legacy" :
3842 is_vht(rate) ? "VHT" : "HT");
3843 if (!is_legacy(rate)) {
3844 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3845 (is_siso(rate)) ? "SISO" : "MIMO2");
3846 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3847 (is_ht20(rate)) ? "20MHz" :
3848 (is_ht40(rate)) ? "40MHz" :
3849 (is_ht80(rate)) ? "80MHz" :
3850 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3851 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3852 (rate->sgi) ? "SGI" : "NGI",
3853 (rate->ldpc) ? "LDPC" : "BCC",
3854 (lq_sta->is_agg) ? "AGG on" : "",
3855 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3856 }
3857 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3858 lq_sta->last_rate_n_flags);
3859 desc += scnprintf(buff + desc, bufsz - desc,
3860 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3861 lq_sta->lq.flags,
3862 lq_sta->lq.mimo_delim,
3863 lq_sta->lq.single_stream_ant_msk,
3864 lq_sta->lq.dual_stream_ant_msk);
3865
3866 desc += scnprintf(buff + desc, bufsz - desc,
3867 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3868 le16_to_cpu(lq_sta->lq.agg_time_limit),
3869 lq_sta->lq.agg_disable_start_th,
3870 lq_sta->lq.agg_frame_cnt_limit);
3871
3872 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3873 lq_sta->lq.reduced_tpc);
3874 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3875 desc += scnprintf(buff + desc, bufsz - desc,
3876 "single stream params: %s%s%s%s\n",
3877 (ss_params & LQ_SS_PARAMS_VALID) ?
3878 "VALID" : "INVALID",
3879 (ss_params & LQ_SS_BFER_ALLOWED) ?
3880 ", BFER" : "",
3881 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3882 ", STBC" : "",
3883 (ss_params & LQ_SS_FORCE) ?
3884 ", FORCE" : "");
3885 desc += scnprintf(buff + desc, bufsz - desc,
3886 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3887 lq_sta->lq.initial_rate_index[0],
3888 lq_sta->lq.initial_rate_index[1],
3889 lq_sta->lq.initial_rate_index[2],
3890 lq_sta->lq.initial_rate_index[3]);
3891
3892 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3893 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3894
3895 desc += scnprintf(buff + desc, bufsz - desc,
3896 " rate[%d] 0x%X ", i, r);
3897 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3898 if (desc < bufsz - 1)
3899 buff[desc++] = '\n';
3900 }
3901
3902 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3903 kfree(buff);
3904 return ret;
3905 }
3906
3907 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3908 .write = rs_sta_dbgfs_scale_table_write,
3909 .read = rs_sta_dbgfs_scale_table_read,
3910 .open = simple_open,
3911 .llseek = default_llseek,
3912 };
rs_sta_dbgfs_stats_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3913 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3914 char __user *user_buf, size_t count, loff_t *ppos)
3915 {
3916 char *buff;
3917 int desc = 0;
3918 int i, j;
3919 ssize_t ret;
3920 struct iwl_scale_tbl_info *tbl;
3921 struct rs_rate *rate;
3922 struct iwl_lq_sta *lq_sta = file->private_data;
3923
3924 buff = kmalloc(1024, GFP_KERNEL);
3925 if (!buff)
3926 return -ENOMEM;
3927
3928 for (i = 0; i < LQ_SIZE; i++) {
3929 tbl = &(lq_sta->lq_info[i]);
3930 rate = &tbl->rate;
3931 desc += sprintf(buff+desc,
3932 "%s type=%d SGI=%d BW=%s DUP=0\n"
3933 "index=%d\n",
3934 lq_sta->active_tbl == i ? "*" : "x",
3935 rate->type,
3936 rate->sgi,
3937 is_ht20(rate) ? "20MHz" :
3938 is_ht40(rate) ? "40MHz" :
3939 is_ht80(rate) ? "80MHz" :
3940 is_ht160(rate) ? "160MHz" : "ERR",
3941 rate->index);
3942 for (j = 0; j < IWL_RATE_COUNT; j++) {
3943 desc += sprintf(buff+desc,
3944 "counter=%d success=%d %%=%d\n",
3945 tbl->win[j].counter,
3946 tbl->win[j].success_counter,
3947 tbl->win[j].success_ratio);
3948 }
3949 }
3950 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3951 kfree(buff);
3952 return ret;
3953 }
3954
3955 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3956 .read = rs_sta_dbgfs_stats_table_read,
3957 .open = simple_open,
3958 .llseek = default_llseek,
3959 };
3960
rs_sta_dbgfs_drv_tx_stats_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3961 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3962 char __user *user_buf,
3963 size_t count, loff_t *ppos)
3964 {
3965 static const char * const column_name[] = {
3966 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3967 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3968 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3969 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3970 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3971 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3972 [RS_COLUMN_MIMO2] = "MIMO2",
3973 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3974 };
3975
3976 static const char * const rate_name[] = {
3977 [IWL_RATE_1M_INDEX] = "1M",
3978 [IWL_RATE_2M_INDEX] = "2M",
3979 [IWL_RATE_5M_INDEX] = "5.5M",
3980 [IWL_RATE_11M_INDEX] = "11M",
3981 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3982 [IWL_RATE_9M_INDEX] = "9M",
3983 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3984 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3985 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3986 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3987 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3988 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3989 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3990 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3991 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3992 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3993 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3994 };
3995
3996 char *buff, *pos, *endpos;
3997 int col, rate;
3998 ssize_t ret;
3999 struct iwl_lq_sta *lq_sta = file->private_data;
4000 struct rs_rate_stats *stats;
4001 static const size_t bufsz = 1024;
4002
4003 buff = kmalloc(bufsz, GFP_KERNEL);
4004 if (!buff)
4005 return -ENOMEM;
4006
4007 pos = buff;
4008 endpos = pos + bufsz;
4009
4010 pos += scnprintf(pos, endpos - pos, "COLUMN,");
4011 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
4012 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
4013 pos += scnprintf(pos, endpos - pos, "\n");
4014
4015 for (col = 0; col < RS_COLUMN_COUNT; col++) {
4016 pos += scnprintf(pos, endpos - pos,
4017 "%s,", column_name[col]);
4018
4019 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
4020 stats = &(lq_sta->pers.tx_stats[col][rate]);
4021 pos += scnprintf(pos, endpos - pos,
4022 "%llu/%llu,",
4023 stats->success,
4024 stats->total);
4025 }
4026 pos += scnprintf(pos, endpos - pos, "\n");
4027 }
4028
4029 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
4030 kfree(buff);
4031 return ret;
4032 }
4033
rs_sta_dbgfs_drv_tx_stats_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)4034 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
4035 const char __user *user_buf,
4036 size_t count, loff_t *ppos)
4037 {
4038 struct iwl_lq_sta *lq_sta = file->private_data;
4039 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
4040
4041 return count;
4042 }
4043
4044 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
4045 .read = rs_sta_dbgfs_drv_tx_stats_read,
4046 .write = rs_sta_dbgfs_drv_tx_stats_write,
4047 .open = simple_open,
4048 .llseek = default_llseek,
4049 };
4050
iwl_dbgfs_ss_force_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)4051 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
4052 char __user *user_buf,
4053 size_t count, loff_t *ppos)
4054 {
4055 struct iwl_lq_sta *lq_sta = file->private_data;
4056 char buf[12];
4057 int bufsz = sizeof(buf);
4058 int pos = 0;
4059 static const char * const ss_force_name[] = {
4060 [RS_SS_FORCE_NONE] = "none",
4061 [RS_SS_FORCE_STBC] = "stbc",
4062 [RS_SS_FORCE_BFER] = "bfer",
4063 [RS_SS_FORCE_SISO] = "siso",
4064 };
4065
4066 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4067 ss_force_name[lq_sta->pers.ss_force]);
4068 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4069 }
4070
iwl_dbgfs_ss_force_write(struct iwl_lq_sta * lq_sta,char * buf,size_t count,loff_t * ppos)4071 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4072 size_t count, loff_t *ppos)
4073 {
4074 struct iwl_mvm *mvm = lq_sta->pers.drv;
4075 int ret = 0;
4076
4077 if (!strncmp("none", buf, 4)) {
4078 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4079 } else if (!strncmp("siso", buf, 4)) {
4080 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4081 } else if (!strncmp("stbc", buf, 4)) {
4082 if (lq_sta->stbc_capable) {
4083 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4084 } else {
4085 IWL_ERR(mvm,
4086 "can't force STBC. peer doesn't support\n");
4087 ret = -EINVAL;
4088 }
4089 } else if (!strncmp("bfer", buf, 4)) {
4090 if (lq_sta->bfer_capable) {
4091 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4092 } else {
4093 IWL_ERR(mvm,
4094 "can't force BFER. peer doesn't support\n");
4095 ret = -EINVAL;
4096 }
4097 } else {
4098 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4099 ret = -EINVAL;
4100 }
4101 return ret ?: count;
4102 }
4103
4104 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4105 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4106 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
4107 debugfs_create_file(#name, mode, parent, lq_sta, \
4108 &iwl_dbgfs_##name##_ops); \
4109 } while (0)
4110
4111 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4112
rs_drv_add_sta_debugfs(void * mvm,void * priv_sta,struct dentry * dir)4113 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4114 struct dentry *dir)
4115 {
4116 struct iwl_lq_sta *lq_sta = priv_sta;
4117 struct iwl_mvm_sta *mvmsta;
4118
4119 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4120
4121 if (!mvmsta->vif)
4122 return;
4123
4124 debugfs_create_file("rate_scale_table", 0600, dir,
4125 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4126 debugfs_create_file("rate_stats_table", 0400, dir,
4127 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4128 debugfs_create_file("drv_tx_stats", 0600, dir,
4129 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4130 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4131 &lq_sta->tx_agg_tid_en);
4132 debugfs_create_u8("reduced_tpc", 0600, dir,
4133 &lq_sta->pers.dbg_fixed_txp_reduction);
4134
4135 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4136 }
4137 #endif
4138
4139 /*
4140 * Initialization of rate scaling information is done by driver after
4141 * the station is added. Since mac80211 calls this function before a
4142 * station is added we ignore it.
4143 */
rs_rate_init_ops(void * mvm_r,struct ieee80211_supported_band * sband,struct cfg80211_chan_def * chandef,struct ieee80211_sta * sta,void * mvm_sta)4144 static void rs_rate_init_ops(void *mvm_r,
4145 struct ieee80211_supported_band *sband,
4146 struct cfg80211_chan_def *chandef,
4147 struct ieee80211_sta *sta, void *mvm_sta)
4148 {
4149 }
4150
4151 /* ops for rate scaling implemented in the driver */
4152 static const struct rate_control_ops rs_mvm_ops_drv = {
4153 .name = RS_NAME,
4154 .tx_status = rs_drv_mac80211_tx_status,
4155 .get_rate = rs_drv_get_rate,
4156 .rate_init = rs_rate_init_ops,
4157 .alloc = rs_alloc,
4158 .free = rs_free,
4159 .alloc_sta = rs_drv_alloc_sta,
4160 .free_sta = rs_free_sta,
4161 .rate_update = rs_drv_rate_update,
4162 #ifdef CONFIG_MAC80211_DEBUGFS
4163 .add_sta_debugfs = rs_drv_add_sta_debugfs,
4164 #endif
4165 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4166 };
4167
iwl_mvm_rs_rate_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,enum nl80211_band band,bool update)4168 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4169 enum nl80211_band band, bool update)
4170 {
4171 if (iwl_mvm_has_tlc_offload(mvm)) {
4172 rs_fw_rate_init(mvm, sta, band, update);
4173 } else {
4174 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4175
4176 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock);
4177 rs_drv_rate_init(mvm, sta, band);
4178 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock);
4179 }
4180 }
4181
iwl_mvm_rate_control_register(void)4182 int iwl_mvm_rate_control_register(void)
4183 {
4184 return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4185 }
4186
iwl_mvm_rate_control_unregister(void)4187 void iwl_mvm_rate_control_unregister(void)
4188 {
4189 ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4190 }
4191
rs_drv_tx_protection(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,bool enable)4192 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4193 bool enable)
4194 {
4195 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4196
4197 lockdep_assert_held(&mvm->mutex);
4198
4199 if (enable) {
4200 if (mvmsta->tx_protection == 0)
4201 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4202 mvmsta->tx_protection++;
4203 } else {
4204 mvmsta->tx_protection--;
4205 if (mvmsta->tx_protection == 0)
4206 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4207 }
4208
4209 return iwl_mvm_send_lq_cmd(mvm, lq);
4210 }
4211
4212 /**
4213 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4214 * @mvmsta: The station
4215 * @enable: Enable Tx protection?
4216 */
iwl_mvm_tx_protection(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,bool enable)4217 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4218 bool enable)
4219 {
4220 if (iwl_mvm_has_tlc_offload(mvm))
4221 return rs_fw_tx_protection(mvm, mvmsta, enable);
4222 else
4223 return rs_drv_tx_protection(mvm, mvmsta, enable);
4224 }
4225