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