1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
5 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
6 * Copyright(c) 2018 Intel Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of version 2 of the GNU General Public License as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * The full GNU General Public License is included in this distribution in the
18 * file called LICENSE.
19 *
20 * Contact Information:
21 * Intel Linux Wireless <linuxwifi@intel.com>
22 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
23 *
24 *****************************************************************************/
25 #include <linux/kernel.h>
26 #include <linux/skbuff.h>
27 #include <linux/slab.h>
28 #include <net/mac80211.h>
29
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/delay.h>
33
34 #include <linux/workqueue.h>
35 #include "rs.h"
36 #include "fw-api.h"
37 #include "sta.h"
38 #include "iwl-op-mode.h"
39 #include "mvm.h"
40 #include "debugfs.h"
41
42 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
43
44 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
45 * Use this macro when dealing with thresholds consts set as a percentage
46 */
47 #define RS_PERCENT(x) (128 * x)
48
49 static u8 rs_ht_to_legacy[] = {
50 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
51 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
52 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
53 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
54 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
55 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
56 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
57 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
58 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
59 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
60 };
61
62 static const u8 ant_toggle_lookup[] = {
63 [ANT_NONE] = ANT_NONE,
64 [ANT_A] = ANT_B,
65 [ANT_B] = ANT_A,
66 [ANT_AB] = ANT_AB,
67 };
68
69 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
70 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
71 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
72 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
73 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
74 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
75 IWL_RATE_##rp##M_INDEX, \
76 IWL_RATE_##rn##M_INDEX }
77
78 #define IWL_DECLARE_MCS_RATE(s) \
79 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
84 IWL_RATE_INVM_INDEX, \
85 IWL_RATE_INVM_INDEX }
86
87 /*
88 * Parameter order:
89 * rate, ht rate, prev rate, next rate
90 *
91 * If there isn't a valid next or previous rate then INV is used which
92 * maps to IWL_RATE_INVALID
93 *
94 */
95 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
96 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
97 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
98 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
99 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
100 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
101 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
102 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
103 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
104 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
105 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
106 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
107 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
108 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
109 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
110 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
111 };
112
113 enum rs_action {
114 RS_ACTION_STAY = 0,
115 RS_ACTION_DOWNSCALE = -1,
116 RS_ACTION_UPSCALE = 1,
117 };
118
119 enum rs_column_mode {
120 RS_INVALID = 0,
121 RS_LEGACY,
122 RS_SISO,
123 RS_MIMO2,
124 };
125
126 #define MAX_NEXT_COLUMNS 7
127 #define MAX_COLUMN_CHECKS 3
128
129 struct rs_tx_column;
130
131 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
132 struct ieee80211_sta *sta,
133 struct rs_rate *rate,
134 const struct rs_tx_column *next_col);
135
136 struct rs_tx_column {
137 enum rs_column_mode mode;
138 u8 ant;
139 bool sgi;
140 enum rs_column next_columns[MAX_NEXT_COLUMNS];
141 allow_column_func_t checks[MAX_COLUMN_CHECKS];
142 };
143
rs_ant_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)144 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
145 struct rs_rate *rate,
146 const struct rs_tx_column *next_col)
147 {
148 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
149 }
150
rs_mimo_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)151 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
152 struct rs_rate *rate,
153 const struct rs_tx_column *next_col)
154 {
155 if (!sta->ht_cap.ht_supported)
156 return false;
157
158 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
159 return false;
160
161 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
162 return false;
163
164 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
165 return false;
166
167 if (mvm->nvm_data->sku_cap_mimo_disabled)
168 return false;
169
170 return true;
171 }
172
rs_siso_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)173 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
174 struct rs_rate *rate,
175 const struct rs_tx_column *next_col)
176 {
177 if (!sta->ht_cap.ht_supported)
178 return false;
179
180 return true;
181 }
182
rs_sgi_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct rs_rate * rate,const struct rs_tx_column * next_col)183 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
184 struct rs_rate *rate,
185 const struct rs_tx_column *next_col)
186 {
187 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
188 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
189
190 if (is_ht20(rate) && (ht_cap->cap &
191 IEEE80211_HT_CAP_SGI_20))
192 return true;
193 if (is_ht40(rate) && (ht_cap->cap &
194 IEEE80211_HT_CAP_SGI_40))
195 return true;
196 if (is_ht80(rate) && (vht_cap->cap &
197 IEEE80211_VHT_CAP_SHORT_GI_80))
198 return true;
199 if (is_ht160(rate) && (vht_cap->cap &
200 IEEE80211_VHT_CAP_SHORT_GI_160))
201 return true;
202
203 return false;
204 }
205
206 static const struct rs_tx_column rs_tx_columns[] = {
207 [RS_COLUMN_LEGACY_ANT_A] = {
208 .mode = RS_LEGACY,
209 .ant = ANT_A,
210 .next_columns = {
211 RS_COLUMN_LEGACY_ANT_B,
212 RS_COLUMN_SISO_ANT_A,
213 RS_COLUMN_MIMO2,
214 RS_COLUMN_INVALID,
215 RS_COLUMN_INVALID,
216 RS_COLUMN_INVALID,
217 RS_COLUMN_INVALID,
218 },
219 .checks = {
220 rs_ant_allow,
221 },
222 },
223 [RS_COLUMN_LEGACY_ANT_B] = {
224 .mode = RS_LEGACY,
225 .ant = ANT_B,
226 .next_columns = {
227 RS_COLUMN_LEGACY_ANT_A,
228 RS_COLUMN_SISO_ANT_B,
229 RS_COLUMN_MIMO2,
230 RS_COLUMN_INVALID,
231 RS_COLUMN_INVALID,
232 RS_COLUMN_INVALID,
233 RS_COLUMN_INVALID,
234 },
235 .checks = {
236 rs_ant_allow,
237 },
238 },
239 [RS_COLUMN_SISO_ANT_A] = {
240 .mode = RS_SISO,
241 .ant = ANT_A,
242 .next_columns = {
243 RS_COLUMN_SISO_ANT_B,
244 RS_COLUMN_MIMO2,
245 RS_COLUMN_SISO_ANT_A_SGI,
246 RS_COLUMN_LEGACY_ANT_A,
247 RS_COLUMN_LEGACY_ANT_B,
248 RS_COLUMN_INVALID,
249 RS_COLUMN_INVALID,
250 },
251 .checks = {
252 rs_siso_allow,
253 rs_ant_allow,
254 },
255 },
256 [RS_COLUMN_SISO_ANT_B] = {
257 .mode = RS_SISO,
258 .ant = ANT_B,
259 .next_columns = {
260 RS_COLUMN_SISO_ANT_A,
261 RS_COLUMN_MIMO2,
262 RS_COLUMN_SISO_ANT_B_SGI,
263 RS_COLUMN_LEGACY_ANT_A,
264 RS_COLUMN_LEGACY_ANT_B,
265 RS_COLUMN_INVALID,
266 RS_COLUMN_INVALID,
267 },
268 .checks = {
269 rs_siso_allow,
270 rs_ant_allow,
271 },
272 },
273 [RS_COLUMN_SISO_ANT_A_SGI] = {
274 .mode = RS_SISO,
275 .ant = ANT_A,
276 .sgi = true,
277 .next_columns = {
278 RS_COLUMN_SISO_ANT_B_SGI,
279 RS_COLUMN_MIMO2_SGI,
280 RS_COLUMN_SISO_ANT_A,
281 RS_COLUMN_LEGACY_ANT_A,
282 RS_COLUMN_LEGACY_ANT_B,
283 RS_COLUMN_INVALID,
284 RS_COLUMN_INVALID,
285 },
286 .checks = {
287 rs_siso_allow,
288 rs_ant_allow,
289 rs_sgi_allow,
290 },
291 },
292 [RS_COLUMN_SISO_ANT_B_SGI] = {
293 .mode = RS_SISO,
294 .ant = ANT_B,
295 .sgi = true,
296 .next_columns = {
297 RS_COLUMN_SISO_ANT_A_SGI,
298 RS_COLUMN_MIMO2_SGI,
299 RS_COLUMN_SISO_ANT_B,
300 RS_COLUMN_LEGACY_ANT_A,
301 RS_COLUMN_LEGACY_ANT_B,
302 RS_COLUMN_INVALID,
303 RS_COLUMN_INVALID,
304 },
305 .checks = {
306 rs_siso_allow,
307 rs_ant_allow,
308 rs_sgi_allow,
309 },
310 },
311 [RS_COLUMN_MIMO2] = {
312 .mode = RS_MIMO2,
313 .ant = ANT_AB,
314 .next_columns = {
315 RS_COLUMN_SISO_ANT_A,
316 RS_COLUMN_MIMO2_SGI,
317 RS_COLUMN_LEGACY_ANT_A,
318 RS_COLUMN_LEGACY_ANT_B,
319 RS_COLUMN_INVALID,
320 RS_COLUMN_INVALID,
321 RS_COLUMN_INVALID,
322 },
323 .checks = {
324 rs_mimo_allow,
325 },
326 },
327 [RS_COLUMN_MIMO2_SGI] = {
328 .mode = RS_MIMO2,
329 .ant = ANT_AB,
330 .sgi = true,
331 .next_columns = {
332 RS_COLUMN_SISO_ANT_A_SGI,
333 RS_COLUMN_MIMO2,
334 RS_COLUMN_LEGACY_ANT_A,
335 RS_COLUMN_LEGACY_ANT_B,
336 RS_COLUMN_INVALID,
337 RS_COLUMN_INVALID,
338 RS_COLUMN_INVALID,
339 },
340 .checks = {
341 rs_mimo_allow,
342 rs_sgi_allow,
343 },
344 },
345 };
346
rs_extract_rate(u32 rate_n_flags)347 static inline u8 rs_extract_rate(u32 rate_n_flags)
348 {
349 /* also works for HT because bits 7:6 are zero there */
350 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
351 }
352
iwl_hwrate_to_plcp_idx(u32 rate_n_flags)353 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
354 {
355 int idx = 0;
356
357 if (rate_n_flags & RATE_MCS_HT_MSK) {
358 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
359 idx += IWL_RATE_MCS_0_INDEX;
360
361 /* skip 9M not supported in HT*/
362 if (idx >= IWL_RATE_9M_INDEX)
363 idx += 1;
364 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
365 return idx;
366 } else if (rate_n_flags & RATE_MCS_VHT_MSK ||
367 rate_n_flags & RATE_MCS_HE_MSK) {
368 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
369 idx += IWL_RATE_MCS_0_INDEX;
370
371 /* skip 9M not supported in VHT*/
372 if (idx >= IWL_RATE_9M_INDEX)
373 idx++;
374 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
375 return idx;
376 if ((rate_n_flags & RATE_MCS_HE_MSK) &&
377 (idx <= IWL_LAST_HE_RATE))
378 return idx;
379 } else {
380 /* legacy rate format, search for match in table */
381
382 u8 legacy_rate = rs_extract_rate(rate_n_flags);
383 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
384 if (iwl_rates[idx].plcp == legacy_rate)
385 return idx;
386 }
387
388 return IWL_RATE_INVALID;
389 }
390
391 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
392 struct ieee80211_sta *sta,
393 struct iwl_lq_sta *lq_sta,
394 int tid, bool ndp);
395 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
396 struct ieee80211_sta *sta,
397 struct iwl_lq_sta *lq_sta,
398 const struct rs_rate *initial_rate);
399 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
400
401 /**
402 * The following tables contain the expected throughput metrics for all rates
403 *
404 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
405 *
406 * where invalid entries are zeros.
407 *
408 * CCK rates are only valid in legacy table and will only be used in G
409 * (2.4 GHz) band.
410 */
411
412 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
413 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
414 };
415
416 /* Expected TpT tables. 4 indexes:
417 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
418 */
419 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
420 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
421 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
422 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
423 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
424 };
425
426 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
427 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
428 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
429 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
430 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
431 };
432
433 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
434 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
435 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
436 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
437 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
438 };
439
440 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
441 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
442 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
443 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
444 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
445 };
446
447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
448 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
449 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
450 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
451 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
452 };
453
454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
455 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
456 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
457 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
458 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
459 };
460
461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
462 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
463 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
464 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
465 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
466 };
467
468 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
469 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
470 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
471 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
472 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
473 };
474
475 /* mbps, mcs */
476 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
477 { "1", "BPSK DSSS"},
478 { "2", "QPSK DSSS"},
479 {"5.5", "BPSK CCK"},
480 { "11", "QPSK CCK"},
481 { "6", "BPSK 1/2"},
482 { "9", "BPSK 1/2"},
483 { "12", "QPSK 1/2"},
484 { "18", "QPSK 3/4"},
485 { "24", "16QAM 1/2"},
486 { "36", "16QAM 3/4"},
487 { "48", "64QAM 2/3"},
488 { "54", "64QAM 3/4"},
489 { "60", "64QAM 5/6"},
490 };
491
492 #define MCS_INDEX_PER_STREAM (8)
493
rs_pretty_ant(u8 ant)494 static const char *rs_pretty_ant(u8 ant)
495 {
496 static const char * const ant_name[] = {
497 [ANT_NONE] = "None",
498 [ANT_A] = "A",
499 [ANT_B] = "B",
500 [ANT_AB] = "AB",
501 [ANT_C] = "C",
502 [ANT_AC] = "AC",
503 [ANT_BC] = "BC",
504 [ANT_ABC] = "ABC",
505 };
506
507 if (ant > ANT_ABC)
508 return "UNKNOWN";
509
510 return ant_name[ant];
511 }
512
rs_pretty_lq_type(enum iwl_table_type type)513 static const char *rs_pretty_lq_type(enum iwl_table_type type)
514 {
515 static const char * const lq_types[] = {
516 [LQ_NONE] = "NONE",
517 [LQ_LEGACY_A] = "LEGACY_A",
518 [LQ_LEGACY_G] = "LEGACY_G",
519 [LQ_HT_SISO] = "HT SISO",
520 [LQ_HT_MIMO2] = "HT MIMO",
521 [LQ_VHT_SISO] = "VHT SISO",
522 [LQ_VHT_MIMO2] = "VHT MIMO",
523 [LQ_HE_SISO] = "HE SISO",
524 [LQ_HE_MIMO2] = "HE MIMO",
525 };
526
527 if (type < LQ_NONE || type >= LQ_MAX)
528 return "UNKNOWN";
529
530 return lq_types[type];
531 }
532
rs_pretty_rate(const struct rs_rate * rate)533 static char *rs_pretty_rate(const struct rs_rate *rate)
534 {
535 static char buf[40];
536 static const char * const legacy_rates[] = {
537 [IWL_RATE_1M_INDEX] = "1M",
538 [IWL_RATE_2M_INDEX] = "2M",
539 [IWL_RATE_5M_INDEX] = "5.5M",
540 [IWL_RATE_11M_INDEX] = "11M",
541 [IWL_RATE_6M_INDEX] = "6M",
542 [IWL_RATE_9M_INDEX] = "9M",
543 [IWL_RATE_12M_INDEX] = "12M",
544 [IWL_RATE_18M_INDEX] = "18M",
545 [IWL_RATE_24M_INDEX] = "24M",
546 [IWL_RATE_36M_INDEX] = "36M",
547 [IWL_RATE_48M_INDEX] = "48M",
548 [IWL_RATE_54M_INDEX] = "54M",
549 };
550 static const char *const ht_vht_rates[] = {
551 [IWL_RATE_MCS_0_INDEX] = "MCS0",
552 [IWL_RATE_MCS_1_INDEX] = "MCS1",
553 [IWL_RATE_MCS_2_INDEX] = "MCS2",
554 [IWL_RATE_MCS_3_INDEX] = "MCS3",
555 [IWL_RATE_MCS_4_INDEX] = "MCS4",
556 [IWL_RATE_MCS_5_INDEX] = "MCS5",
557 [IWL_RATE_MCS_6_INDEX] = "MCS6",
558 [IWL_RATE_MCS_7_INDEX] = "MCS7",
559 [IWL_RATE_MCS_8_INDEX] = "MCS8",
560 [IWL_RATE_MCS_9_INDEX] = "MCS9",
561 };
562 const char *rate_str;
563
564 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
565 rate_str = legacy_rates[rate->index];
566 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
567 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
568 (rate->index <= IWL_RATE_MCS_9_INDEX))
569 rate_str = ht_vht_rates[rate->index];
570 else
571 rate_str = "BAD_RATE";
572
573 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
574 rs_pretty_ant(rate->ant), rate_str);
575 return buf;
576 }
577
rs_dump_rate(struct iwl_mvm * mvm,const struct rs_rate * rate,const char * prefix)578 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
579 const char *prefix)
580 {
581 IWL_DEBUG_RATE(mvm,
582 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
583 prefix, rs_pretty_rate(rate), rate->bw,
584 rate->sgi, rate->ldpc, rate->stbc);
585 }
586
rs_rate_scale_clear_window(struct iwl_rate_scale_data * window)587 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
588 {
589 window->data = 0;
590 window->success_counter = 0;
591 window->success_ratio = IWL_INVALID_VALUE;
592 window->counter = 0;
593 window->average_tpt = IWL_INVALID_VALUE;
594 }
595
rs_rate_scale_clear_tbl_windows(struct iwl_mvm * mvm,struct iwl_scale_tbl_info * tbl)596 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
597 struct iwl_scale_tbl_info *tbl)
598 {
599 int i;
600
601 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
602 for (i = 0; i < IWL_RATE_COUNT; i++)
603 rs_rate_scale_clear_window(&tbl->win[i]);
604
605 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
606 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
607 }
608
rs_is_valid_ant(u8 valid_antenna,u8 ant_type)609 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
610 {
611 return (ant_type & valid_antenna) == ant_type;
612 }
613
rs_tl_turn_on_agg_for_tid(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_data,u8 tid,struct ieee80211_sta * sta)614 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
615 struct iwl_lq_sta *lq_data, u8 tid,
616 struct ieee80211_sta *sta)
617 {
618 int ret = -EAGAIN;
619
620 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
621 sta->addr, tid);
622
623 /* start BA session until the peer sends del BA */
624 ret = ieee80211_start_tx_ba_session(sta, tid, 0);
625 if (ret == -EAGAIN) {
626 /*
627 * driver and mac80211 is out of sync
628 * this might be cause by reloading firmware
629 * stop the tx ba session here
630 */
631 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
632 tid);
633 ieee80211_stop_tx_ba_session(sta, tid);
634 }
635 return ret;
636 }
637
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)638 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
639 u8 tid, struct iwl_lq_sta *lq_sta,
640 struct ieee80211_sta *sta)
641 {
642 struct iwl_mvm_tid_data *tid_data;
643
644 /*
645 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
646 * when the frame is not QoS
647 */
648 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
649 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
650 tid, IWL_MAX_TID_COUNT);
651 return;
652 } else if (tid == IWL_MAX_TID_COUNT) {
653 return;
654 }
655
656 tid_data = &mvmsta->tid_data[tid];
657 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
658 tid_data->state == IWL_AGG_OFF &&
659 (lq_sta->tx_agg_tid_en & BIT(tid)) &&
660 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
661 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
662 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
663 tid_data->state = IWL_AGG_QUEUED;
664 }
665 }
666
get_num_of_ant_from_rate(u32 rate_n_flags)667 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
668 {
669 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
670 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
671 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
672 }
673
674 /*
675 * Static function to get the expected throughput from an iwl_scale_tbl_info
676 * that wraps a NULL pointer check
677 */
get_expected_tpt(struct iwl_scale_tbl_info * tbl,int rs_index)678 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
679 {
680 if (tbl->expected_tpt)
681 return tbl->expected_tpt[rs_index];
682 return 0;
683 }
684
685 /**
686 * rs_collect_tx_data - Update the success/failure sliding window
687 *
688 * We keep a sliding window of the last 62 packets transmitted
689 * at this rate. window->data contains the bitmask of successful
690 * packets.
691 */
_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)692 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
693 struct iwl_scale_tbl_info *tbl,
694 int scale_index, int attempts, int successes,
695 struct iwl_rate_scale_data *window)
696 {
697 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
698 s32 fail_count, tpt;
699
700 /* Get expected throughput */
701 tpt = get_expected_tpt(tbl, scale_index);
702
703 /*
704 * Keep track of only the latest 62 tx frame attempts in this rate's
705 * history window; anything older isn't really relevant any more.
706 * If we have filled up the sliding window, drop the oldest attempt;
707 * if the oldest attempt (highest bit in bitmap) shows "success",
708 * subtract "1" from the success counter (this is the main reason
709 * we keep these bitmaps!).
710 */
711 while (attempts > 0) {
712 if (window->counter >= IWL_RATE_MAX_WINDOW) {
713 /* remove earliest */
714 window->counter = IWL_RATE_MAX_WINDOW - 1;
715
716 if (window->data & mask) {
717 window->data &= ~mask;
718 window->success_counter--;
719 }
720 }
721
722 /* Increment frames-attempted counter */
723 window->counter++;
724
725 /* Shift bitmap by one frame to throw away oldest history */
726 window->data <<= 1;
727
728 /* Mark the most recent #successes attempts as successful */
729 if (successes > 0) {
730 window->success_counter++;
731 window->data |= 0x1;
732 successes--;
733 }
734
735 attempts--;
736 }
737
738 /* Calculate current success ratio, avoid divide-by-0! */
739 if (window->counter > 0)
740 window->success_ratio = 128 * (100 * window->success_counter)
741 / window->counter;
742 else
743 window->success_ratio = IWL_INVALID_VALUE;
744
745 fail_count = window->counter - window->success_counter;
746
747 /* Calculate average throughput, if we have enough history. */
748 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
749 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
750 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
751 else
752 window->average_tpt = IWL_INVALID_VALUE;
753
754 return 0;
755 }
756
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)757 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
758 struct iwl_lq_sta *lq_sta,
759 struct iwl_scale_tbl_info *tbl,
760 int scale_index, int attempts, int successes,
761 u8 reduced_txp)
762 {
763 struct iwl_rate_scale_data *window = NULL;
764
765 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
766 return -EINVAL;
767
768 window = &tbl->tpc_win[reduced_txp];
769 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
770 window);
771 }
772
rs_update_tid_tpt_stats(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,u8 tid,int successes)773 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
774 struct iwl_mvm_sta *mvmsta,
775 u8 tid, int successes)
776 {
777 struct iwl_mvm_tid_data *tid_data;
778
779 if (tid >= IWL_MAX_TID_COUNT)
780 return;
781
782 tid_data = &mvmsta->tid_data[tid];
783
784 /*
785 * Measure if there're enough successful transmits per second.
786 * These statistics are used only to decide if we can start a
787 * BA session, so it should be updated only when A-MPDU is
788 * off.
789 */
790 if (tid_data->state != IWL_AGG_OFF)
791 return;
792
793 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
794 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
795 tid_data->tx_count_last = tid_data->tx_count;
796 tid_data->tx_count = 0;
797 tid_data->tpt_meas_start = jiffies;
798 } else {
799 tid_data->tx_count += successes;
800 }
801 }
802
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)803 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
804 struct iwl_mvm_sta *mvmsta, u8 tid,
805 struct iwl_scale_tbl_info *tbl,
806 int scale_index, int attempts, int successes)
807 {
808 struct iwl_rate_scale_data *window = NULL;
809
810 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
811 return -EINVAL;
812
813 if (tbl->column != RS_COLUMN_INVALID) {
814 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
815
816 pers->tx_stats[tbl->column][scale_index].total += attempts;
817 pers->tx_stats[tbl->column][scale_index].success += successes;
818 }
819
820 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
821
822 /* Select window for current tx bit rate */
823 window = &(tbl->win[scale_index]);
824 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
825 window);
826 }
827
828 /* Convert rs_rate object into ucode rate bitmask */
ucode_rate_from_rs_rate(struct iwl_mvm * mvm,struct rs_rate * rate)829 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
830 struct rs_rate *rate)
831 {
832 u32 ucode_rate = 0;
833 int index = rate->index;
834
835 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
836 RATE_MCS_ANT_ABC_MSK);
837
838 if (is_legacy(rate)) {
839 ucode_rate |= iwl_rates[index].plcp;
840 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
841 ucode_rate |= RATE_MCS_CCK_MSK;
842 return ucode_rate;
843 }
844
845 if (is_ht(rate)) {
846 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
847 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
848 index = IWL_LAST_HT_RATE;
849 }
850 ucode_rate |= RATE_MCS_HT_MSK;
851
852 if (is_ht_siso(rate))
853 ucode_rate |= iwl_rates[index].plcp_ht_siso;
854 else if (is_ht_mimo2(rate))
855 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
856 else
857 WARN_ON_ONCE(1);
858 } else if (is_vht(rate)) {
859 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
860 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
861 index = IWL_LAST_VHT_RATE;
862 }
863 ucode_rate |= RATE_MCS_VHT_MSK;
864 if (is_vht_siso(rate))
865 ucode_rate |= iwl_rates[index].plcp_vht_siso;
866 else if (is_vht_mimo2(rate))
867 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
868 else
869 WARN_ON_ONCE(1);
870
871 } else {
872 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
873 }
874
875 if (is_siso(rate) && rate->stbc) {
876 /* To enable STBC we need to set both a flag and ANT_AB */
877 ucode_rate |= RATE_MCS_ANT_AB_MSK;
878 ucode_rate |= RATE_MCS_STBC_MSK;
879 }
880
881 ucode_rate |= rate->bw;
882 if (rate->sgi)
883 ucode_rate |= RATE_MCS_SGI_MSK;
884 if (rate->ldpc)
885 ucode_rate |= RATE_MCS_LDPC_MSK;
886
887 return ucode_rate;
888 }
889
890 /* 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)891 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
892 enum nl80211_band band,
893 struct rs_rate *rate)
894 {
895 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
896 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
897 u8 nss;
898
899 memset(rate, 0, sizeof(*rate));
900 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
901
902 if (rate->index == IWL_RATE_INVALID)
903 return -EINVAL;
904
905 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
906
907 /* Legacy */
908 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
909 !(ucode_rate & RATE_MCS_VHT_MSK) &&
910 !(ucode_rate & RATE_MCS_HE_MSK)) {
911 if (num_of_ant == 1) {
912 if (band == NL80211_BAND_5GHZ)
913 rate->type = LQ_LEGACY_A;
914 else
915 rate->type = LQ_LEGACY_G;
916 }
917
918 return 0;
919 }
920
921 /* HT, VHT or HE */
922 if (ucode_rate & RATE_MCS_SGI_MSK)
923 rate->sgi = true;
924 if (ucode_rate & RATE_MCS_LDPC_MSK)
925 rate->ldpc = true;
926 if (ucode_rate & RATE_MCS_STBC_MSK)
927 rate->stbc = true;
928 if (ucode_rate & RATE_MCS_BF_MSK)
929 rate->bfer = true;
930
931 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
932
933 if (ucode_rate & RATE_MCS_HT_MSK) {
934 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
935 RATE_HT_MCS_NSS_POS) + 1;
936
937 if (nss == 1) {
938 rate->type = LQ_HT_SISO;
939 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
940 "stbc %d bfer %d",
941 rate->stbc, rate->bfer);
942 } else if (nss == 2) {
943 rate->type = LQ_HT_MIMO2;
944 WARN_ON_ONCE(num_of_ant != 2);
945 } else {
946 WARN_ON_ONCE(1);
947 }
948 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
949 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
950 RATE_VHT_MCS_NSS_POS) + 1;
951
952 if (nss == 1) {
953 rate->type = LQ_VHT_SISO;
954 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
955 "stbc %d bfer %d",
956 rate->stbc, rate->bfer);
957 } else if (nss == 2) {
958 rate->type = LQ_VHT_MIMO2;
959 WARN_ON_ONCE(num_of_ant != 2);
960 } else {
961 WARN_ON_ONCE(1);
962 }
963 } else if (ucode_rate & RATE_MCS_HE_MSK) {
964 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
965 RATE_VHT_MCS_NSS_POS) + 1;
966
967 if (nss == 1) {
968 rate->type = LQ_HE_SISO;
969 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
970 "stbc %d bfer %d", rate->stbc, rate->bfer);
971 } else if (nss == 2) {
972 rate->type = LQ_HE_MIMO2;
973 WARN_ON_ONCE(num_of_ant != 2);
974 } else {
975 WARN_ON_ONCE(1);
976 }
977 }
978
979 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
980 !is_he(rate) && !is_vht(rate));
981
982 return 0;
983 }
984
985 /* switch to another antenna/antennas and return 1 */
986 /* if no other valid antenna found, return 0 */
rs_toggle_antenna(u32 valid_ant,struct rs_rate * rate)987 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
988 {
989 u8 new_ant_type;
990
991 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C))
992 return 0;
993
994 if (!rs_is_valid_ant(valid_ant, rate->ant))
995 return 0;
996
997 new_ant_type = ant_toggle_lookup[rate->ant];
998
999 while ((new_ant_type != rate->ant) &&
1000 !rs_is_valid_ant(valid_ant, new_ant_type))
1001 new_ant_type = ant_toggle_lookup[new_ant_type];
1002
1003 if (new_ant_type == rate->ant)
1004 return 0;
1005
1006 rate->ant = new_ant_type;
1007
1008 return 1;
1009 }
1010
rs_get_supported_rates(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1011 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
1012 struct rs_rate *rate)
1013 {
1014 if (is_legacy(rate))
1015 return lq_sta->active_legacy_rate;
1016 else if (is_siso(rate))
1017 return lq_sta->active_siso_rate;
1018 else if (is_mimo2(rate))
1019 return lq_sta->active_mimo2_rate;
1020
1021 WARN_ON_ONCE(1);
1022 return 0;
1023 }
1024
rs_get_adjacent_rate(struct iwl_mvm * mvm,u8 index,u16 rate_mask,int rate_type)1025 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1026 int rate_type)
1027 {
1028 u8 high = IWL_RATE_INVALID;
1029 u8 low = IWL_RATE_INVALID;
1030
1031 /* 802.11A or ht walks to the next literal adjacent rate in
1032 * the rate table */
1033 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1034 int i;
1035 u32 mask;
1036
1037 /* Find the previous rate that is in the rate mask */
1038 i = index - 1;
1039 if (i >= 0)
1040 mask = BIT(i);
1041 for (; i >= 0; i--, mask >>= 1) {
1042 if (rate_mask & mask) {
1043 low = i;
1044 break;
1045 }
1046 }
1047
1048 /* Find the next rate that is in the rate mask */
1049 i = index + 1;
1050 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1051 if (rate_mask & mask) {
1052 high = i;
1053 break;
1054 }
1055 }
1056
1057 return (high << 8) | low;
1058 }
1059
1060 low = index;
1061 while (low != IWL_RATE_INVALID) {
1062 low = iwl_rates[low].prev_rs;
1063 if (low == IWL_RATE_INVALID)
1064 break;
1065 if (rate_mask & (1 << low))
1066 break;
1067 }
1068
1069 high = index;
1070 while (high != IWL_RATE_INVALID) {
1071 high = iwl_rates[high].next_rs;
1072 if (high == IWL_RATE_INVALID)
1073 break;
1074 if (rate_mask & (1 << high))
1075 break;
1076 }
1077
1078 return (high << 8) | low;
1079 }
1080
rs_rate_supported(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1081 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1082 struct rs_rate *rate)
1083 {
1084 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1085 }
1086
1087 /* Get the next supported lower rate in the current column.
1088 * Return true if bottom rate in the current column was reached
1089 */
rs_get_lower_rate_in_column(struct iwl_lq_sta * lq_sta,struct rs_rate * rate)1090 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1091 struct rs_rate *rate)
1092 {
1093 u8 low;
1094 u16 high_low;
1095 u16 rate_mask;
1096 struct iwl_mvm *mvm = lq_sta->pers.drv;
1097
1098 rate_mask = rs_get_supported_rates(lq_sta, rate);
1099 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1100 rate->type);
1101 low = high_low & 0xff;
1102
1103 /* Bottom rate of column reached */
1104 if (low == IWL_RATE_INVALID)
1105 return true;
1106
1107 rate->index = low;
1108 return false;
1109 }
1110
1111 /* 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)1112 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1113 struct rs_rate *rate)
1114 {
1115 struct iwl_mvm *mvm = lq_sta->pers.drv;
1116
1117 if (is_legacy(rate)) {
1118 /* No column to downgrade from Legacy */
1119 return;
1120 } else if (is_siso(rate)) {
1121 /* Downgrade to Legacy if we were in SISO */
1122 if (lq_sta->band == NL80211_BAND_5GHZ)
1123 rate->type = LQ_LEGACY_A;
1124 else
1125 rate->type = LQ_LEGACY_G;
1126
1127 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1128
1129 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1130 rate->index > IWL_RATE_MCS_9_INDEX);
1131
1132 rate->index = rs_ht_to_legacy[rate->index];
1133 rate->ldpc = false;
1134 } else {
1135 /* Downgrade to SISO with same MCS if in MIMO */
1136 rate->type = is_vht_mimo2(rate) ?
1137 LQ_VHT_SISO : LQ_HT_SISO;
1138 }
1139
1140 if (num_of_ant(rate->ant) > 1)
1141 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1142
1143 /* Relevant in both switching to SISO or Legacy */
1144 rate->sgi = false;
1145
1146 if (!rs_rate_supported(lq_sta, rate))
1147 rs_get_lower_rate_in_column(lq_sta, rate);
1148 }
1149
1150 /* Check if both rates share the same column */
rs_rate_column_match(struct rs_rate * a,struct rs_rate * b)1151 static inline bool rs_rate_column_match(struct rs_rate *a,
1152 struct rs_rate *b)
1153 {
1154 bool ant_match;
1155
1156 if (a->stbc || a->bfer)
1157 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1158 else
1159 ant_match = (a->ant == b->ant);
1160
1161 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1162 && ant_match;
1163 }
1164
rs_get_column_from_rate(struct rs_rate * rate)1165 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1166 {
1167 if (is_legacy(rate)) {
1168 if (rate->ant == ANT_A)
1169 return RS_COLUMN_LEGACY_ANT_A;
1170
1171 if (rate->ant == ANT_B)
1172 return RS_COLUMN_LEGACY_ANT_B;
1173
1174 goto err;
1175 }
1176
1177 if (is_siso(rate)) {
1178 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1179 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1180 RS_COLUMN_SISO_ANT_A;
1181
1182 if (rate->ant == ANT_B)
1183 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1184 RS_COLUMN_SISO_ANT_B;
1185
1186 goto err;
1187 }
1188
1189 if (is_mimo(rate))
1190 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1191
1192 err:
1193 return RS_COLUMN_INVALID;
1194 }
1195
rs_get_tid(struct ieee80211_hdr * hdr)1196 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1197 {
1198 u8 tid = IWL_MAX_TID_COUNT;
1199
1200 if (ieee80211_is_data_qos(hdr->frame_control)) {
1201 u8 *qc = ieee80211_get_qos_ctl(hdr);
1202 tid = qc[0] & 0xf;
1203 }
1204
1205 if (unlikely(tid > IWL_MAX_TID_COUNT))
1206 tid = IWL_MAX_TID_COUNT;
1207
1208 return tid;
1209 }
1210
iwl_mvm_rs_tx_status(struct iwl_mvm * mvm,struct ieee80211_sta * sta,int tid,struct ieee80211_tx_info * info,bool ndp)1211 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1212 int tid, struct ieee80211_tx_info *info, bool ndp)
1213 {
1214 int legacy_success;
1215 int retries;
1216 int i;
1217 struct iwl_lq_cmd *table;
1218 u32 lq_hwrate;
1219 struct rs_rate lq_rate, tx_resp_rate;
1220 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1221 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1222 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1223 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1224 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1225 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1226 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
1227
1228 /* Treat uninitialized rate scaling data same as non-existing. */
1229 if (!lq_sta) {
1230 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1231 return;
1232 } else if (!lq_sta->pers.drv) {
1233 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1234 return;
1235 }
1236
1237 /* This packet was aggregated but doesn't carry status info */
1238 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1239 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1240 return;
1241
1242 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
1243 &tx_resp_rate)) {
1244 WARN_ON_ONCE(1);
1245 return;
1246 }
1247
1248 #ifdef CONFIG_MAC80211_DEBUGFS
1249 /* Disable last tx check if we are debugging with fixed rate but
1250 * update tx stats */
1251 if (lq_sta->pers.dbg_fixed_rate) {
1252 int index = tx_resp_rate.index;
1253 enum rs_column column;
1254 int attempts, success;
1255
1256 column = rs_get_column_from_rate(&tx_resp_rate);
1257 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1258 "Can't map rate 0x%x to column",
1259 tx_resp_hwrate))
1260 return;
1261
1262 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1263 attempts = info->status.ampdu_len;
1264 success = info->status.ampdu_ack_len;
1265 } else {
1266 attempts = info->status.rates[0].count;
1267 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1268 }
1269
1270 lq_sta->pers.tx_stats[column][index].total += attempts;
1271 lq_sta->pers.tx_stats[column][index].success += success;
1272
1273 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1274 tx_resp_hwrate, success, attempts);
1275 return;
1276 }
1277 #endif
1278
1279 if (time_after(jiffies,
1280 (unsigned long)(lq_sta->last_tx +
1281 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1282 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1283 iwl_mvm_rs_rate_init(mvm, sta, info->band, true);
1284 return;
1285 }
1286 lq_sta->last_tx = jiffies;
1287
1288 /* Ignore this Tx frame response if its initial rate doesn't match
1289 * that of latest Link Quality command. There may be stragglers
1290 * from a previous Link Quality command, but we're no longer interested
1291 * in those; they're either from the "active" mode while we're trying
1292 * to check "search" mode, or a prior "search" mode after we've moved
1293 * to a new "search" mode (which might become the new "active" mode).
1294 */
1295 table = &lq_sta->lq;
1296 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1297 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
1298 WARN_ON_ONCE(1);
1299 return;
1300 }
1301
1302 /* Here we actually compare this rate to the latest LQ command */
1303 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1304 IWL_DEBUG_RATE(mvm,
1305 "tx resp color 0x%x does not match 0x%x\n",
1306 lq_color, LQ_FLAG_COLOR_GET(table->flags));
1307
1308 /*
1309 * Since rates mis-match, the last LQ command may have failed.
1310 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1311 * ... driver.
1312 */
1313 lq_sta->missed_rate_counter++;
1314 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1315 lq_sta->missed_rate_counter = 0;
1316 IWL_DEBUG_RATE(mvm,
1317 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1318 lq_sta->rs_state);
1319 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1320 }
1321 /* Regardless, ignore this status info for outdated rate */
1322 return;
1323 } else
1324 /* Rate did match, so reset the missed_rate_counter */
1325 lq_sta->missed_rate_counter = 0;
1326
1327 if (!lq_sta->search_better_tbl) {
1328 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1329 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1330 } else {
1331 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1332 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1333 }
1334
1335 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1336 IWL_DEBUG_RATE(mvm,
1337 "Neither active nor search matches tx rate\n");
1338 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1339 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1340 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1341 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1342 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1343
1344 /*
1345 * no matching table found, let's by-pass the data collection
1346 * and continue to perform rate scale to find the rate table
1347 */
1348 rs_stay_in_table(lq_sta, true);
1349 goto done;
1350 }
1351
1352 /*
1353 * Updating the frame history depends on whether packets were
1354 * aggregated.
1355 *
1356 * For aggregation, all packets were transmitted at the same rate, the
1357 * first index into rate scale table.
1358 */
1359 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1360 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1361 info->status.ampdu_len,
1362 info->status.ampdu_ack_len,
1363 reduced_txp);
1364
1365 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1366 * it as a single frame loss as we don't want the success ratio
1367 * to dip too quickly because a BA wasn't received.
1368 * For TPC, there's no need for this optimisation since we want
1369 * to recover very quickly from a bad power reduction and,
1370 * therefore we'd like the success ratio to get an immediate hit
1371 * when failing to get a BA, so we'd switch back to a lower or
1372 * zero power reduction. When FW transmits agg with a rate
1373 * different from the initial rate, it will not use reduced txp
1374 * and will send BA notification twice (one empty with reduced
1375 * txp equal to the value from LQ and one with reduced txp 0).
1376 * We need to update counters for each txp level accordingly.
1377 */
1378 if (info->status.ampdu_ack_len == 0)
1379 info->status.ampdu_len = 1;
1380
1381 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index,
1382 info->status.ampdu_len,
1383 info->status.ampdu_ack_len);
1384
1385 /* Update success/fail counts if not searching for new mode */
1386 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1387 lq_sta->total_success += info->status.ampdu_ack_len;
1388 lq_sta->total_failed += (info->status.ampdu_len -
1389 info->status.ampdu_ack_len);
1390 }
1391 } else {
1392 /* For legacy, update frame history with for each Tx retry. */
1393 retries = info->status.rates[0].count - 1;
1394 /* HW doesn't send more than 15 retries */
1395 retries = min(retries, 15);
1396
1397 /* The last transmission may have been successful */
1398 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1399 /* Collect data for each rate used during failed TX attempts */
1400 for (i = 0; i <= retries; ++i) {
1401 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1402 if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
1403 &lq_rate)) {
1404 WARN_ON_ONCE(1);
1405 return;
1406 }
1407
1408 /*
1409 * Only collect stats if retried rate is in the same RS
1410 * table as active/search.
1411 */
1412 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1413 tmp_tbl = curr_tbl;
1414 else if (rs_rate_column_match(&lq_rate,
1415 &other_tbl->rate))
1416 tmp_tbl = other_tbl;
1417 else
1418 continue;
1419
1420 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1421 tx_resp_rate.index, 1,
1422 i < retries ? 0 : legacy_success,
1423 reduced_txp);
1424 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
1425 tx_resp_rate.index, 1,
1426 i < retries ? 0 : legacy_success);
1427 }
1428
1429 /* Update success/fail counts if not searching for new mode */
1430 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1431 lq_sta->total_success += legacy_success;
1432 lq_sta->total_failed += retries + (1 - legacy_success);
1433 }
1434 }
1435 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1436 lq_sta->last_rate_n_flags = lq_hwrate;
1437 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1438 done:
1439 /* See if there's a better rate or modulation mode to try. */
1440 if (sta->supp_rates[info->band])
1441 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1442 }
1443
1444 /*
1445 * mac80211 sends us Tx status
1446 */
rs_drv_mac80211_tx_status(void * mvm_r,struct ieee80211_supported_band * sband,struct ieee80211_sta * sta,void * priv_sta,struct sk_buff * skb)1447 static void rs_drv_mac80211_tx_status(void *mvm_r,
1448 struct ieee80211_supported_band *sband,
1449 struct ieee80211_sta *sta, void *priv_sta,
1450 struct sk_buff *skb)
1451 {
1452 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1453 struct iwl_op_mode *op_mode = mvm_r;
1454 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1455 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1456
1457 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1458 return;
1459
1460 if (!ieee80211_is_data(hdr->frame_control) ||
1461 info->flags & IEEE80211_TX_CTL_NO_ACK)
1462 return;
1463
1464 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1465 ieee80211_is_qos_nullfunc(hdr->frame_control));
1466 }
1467
1468 /*
1469 * Begin a period of staying with a selected modulation mode.
1470 * Set "stay_in_tbl" flag to prevent any mode switches.
1471 * Set frame tx success limits according to legacy vs. high-throughput,
1472 * and reset overall (spanning all rates) tx success history statistics.
1473 * These control how long we stay using same modulation mode before
1474 * searching for a new mode.
1475 */
rs_set_stay_in_table(struct iwl_mvm * mvm,u8 is_legacy,struct iwl_lq_sta * lq_sta)1476 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1477 struct iwl_lq_sta *lq_sta)
1478 {
1479 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1480 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1481 if (is_legacy) {
1482 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1483 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1484 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1485 } else {
1486 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1487 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1488 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1489 }
1490 lq_sta->table_count = 0;
1491 lq_sta->total_failed = 0;
1492 lq_sta->total_success = 0;
1493 lq_sta->flush_timer = jiffies;
1494 lq_sta->visited_columns = 0;
1495 }
1496
rs_get_max_rate_from_mask(unsigned long rate_mask)1497 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1498 {
1499 if (rate_mask)
1500 return find_last_bit(&rate_mask, BITS_PER_LONG);
1501 return IWL_RATE_INVALID;
1502 }
1503
rs_get_max_allowed_rate(struct iwl_lq_sta * lq_sta,const struct rs_tx_column * column)1504 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1505 const struct rs_tx_column *column)
1506 {
1507 switch (column->mode) {
1508 case RS_LEGACY:
1509 return lq_sta->max_legacy_rate_idx;
1510 case RS_SISO:
1511 return lq_sta->max_siso_rate_idx;
1512 case RS_MIMO2:
1513 return lq_sta->max_mimo2_rate_idx;
1514 default:
1515 WARN_ON_ONCE(1);
1516 }
1517
1518 return lq_sta->max_legacy_rate_idx;
1519 }
1520
rs_get_expected_tpt_table(struct iwl_lq_sta * lq_sta,const struct rs_tx_column * column,u32 bw)1521 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1522 const struct rs_tx_column *column,
1523 u32 bw)
1524 {
1525 /* Used to choose among HT tables */
1526 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1527
1528 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1529 column->mode != RS_SISO &&
1530 column->mode != RS_MIMO2))
1531 return expected_tpt_legacy;
1532
1533 /* Legacy rates have only one table */
1534 if (column->mode == RS_LEGACY)
1535 return expected_tpt_legacy;
1536
1537 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1538 /* Choose among many HT tables depending on number of streams
1539 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1540 * status */
1541 if (column->mode == RS_SISO) {
1542 switch (bw) {
1543 case RATE_MCS_CHAN_WIDTH_20:
1544 ht_tbl_pointer = expected_tpt_siso_20MHz;
1545 break;
1546 case RATE_MCS_CHAN_WIDTH_40:
1547 ht_tbl_pointer = expected_tpt_siso_40MHz;
1548 break;
1549 case RATE_MCS_CHAN_WIDTH_80:
1550 ht_tbl_pointer = expected_tpt_siso_80MHz;
1551 break;
1552 case RATE_MCS_CHAN_WIDTH_160:
1553 ht_tbl_pointer = expected_tpt_siso_160MHz;
1554 break;
1555 default:
1556 WARN_ON_ONCE(1);
1557 }
1558 } else if (column->mode == RS_MIMO2) {
1559 switch (bw) {
1560 case RATE_MCS_CHAN_WIDTH_20:
1561 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1562 break;
1563 case RATE_MCS_CHAN_WIDTH_40:
1564 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1565 break;
1566 case RATE_MCS_CHAN_WIDTH_80:
1567 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1568 break;
1569 case RATE_MCS_CHAN_WIDTH_160:
1570 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1571 break;
1572 default:
1573 WARN_ON_ONCE(1);
1574 }
1575 } else {
1576 WARN_ON_ONCE(1);
1577 }
1578
1579 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1580 return ht_tbl_pointer[0];
1581 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1582 return ht_tbl_pointer[1];
1583 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1584 return ht_tbl_pointer[2];
1585 else /* AGG+SGI */
1586 return ht_tbl_pointer[3];
1587 }
1588
rs_set_expected_tpt_table(struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)1589 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1590 struct iwl_scale_tbl_info *tbl)
1591 {
1592 struct rs_rate *rate = &tbl->rate;
1593 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1594
1595 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1596 }
1597
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)1598 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1599 struct iwl_lq_sta *lq_sta,
1600 struct iwl_scale_tbl_info *tbl, /* "search" */
1601 unsigned long rate_mask, s8 index)
1602 {
1603 struct iwl_scale_tbl_info *active_tbl =
1604 &(lq_sta->lq_info[lq_sta->active_tbl]);
1605 s32 success_ratio = active_tbl->win[index].success_ratio;
1606 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1607 const u16 *tpt_tbl = tbl->expected_tpt;
1608 u16 high_low;
1609 u32 target_tpt;
1610 int rate_idx;
1611
1612 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1613 target_tpt = 100 * expected_current_tpt;
1614 IWL_DEBUG_RATE(mvm,
1615 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1616 success_ratio, target_tpt);
1617 } else {
1618 target_tpt = lq_sta->last_tpt;
1619 IWL_DEBUG_RATE(mvm,
1620 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1621 success_ratio, target_tpt);
1622 }
1623
1624 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1625
1626 while (rate_idx != IWL_RATE_INVALID) {
1627 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1628 break;
1629
1630 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1631 tbl->rate.type);
1632
1633 rate_idx = (high_low >> 8) & 0xff;
1634 }
1635
1636 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1637 rate_idx, target_tpt,
1638 rate_idx != IWL_RATE_INVALID ?
1639 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1640
1641 return rate_idx;
1642 }
1643
rs_bw_from_sta_bw(struct ieee80211_sta * sta)1644 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1645 {
1646 switch (sta->bandwidth) {
1647 case IEEE80211_STA_RX_BW_160:
1648 return RATE_MCS_CHAN_WIDTH_160;
1649 case IEEE80211_STA_RX_BW_80:
1650 return RATE_MCS_CHAN_WIDTH_80;
1651 case IEEE80211_STA_RX_BW_40:
1652 return RATE_MCS_CHAN_WIDTH_40;
1653 case IEEE80211_STA_RX_BW_20:
1654 default:
1655 return RATE_MCS_CHAN_WIDTH_20;
1656 }
1657 }
1658
1659 /*
1660 * Check whether we should continue using same modulation mode, or
1661 * begin search for a new mode, based on:
1662 * 1) # tx successes or failures while using this mode
1663 * 2) # times calling this function
1664 * 3) elapsed time in this mode (not used, for now)
1665 */
rs_stay_in_table(struct iwl_lq_sta * lq_sta,bool force_search)1666 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1667 {
1668 struct iwl_scale_tbl_info *tbl;
1669 int active_tbl;
1670 int flush_interval_passed = 0;
1671 struct iwl_mvm *mvm;
1672
1673 mvm = lq_sta->pers.drv;
1674 active_tbl = lq_sta->active_tbl;
1675
1676 tbl = &(lq_sta->lq_info[active_tbl]);
1677
1678 /* If we've been disallowing search, see if we should now allow it */
1679 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1680 /* Elapsed time using current modulation mode */
1681 if (lq_sta->flush_timer)
1682 flush_interval_passed =
1683 time_after(jiffies,
1684 (unsigned long)(lq_sta->flush_timer +
1685 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1686
1687 /*
1688 * Check if we should allow search for new modulation mode.
1689 * If many frames have failed or succeeded, or we've used
1690 * this same modulation for a long time, allow search, and
1691 * reset history stats that keep track of whether we should
1692 * allow a new search. Also (below) reset all bitmaps and
1693 * stats in active history.
1694 */
1695 if (force_search ||
1696 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1697 (lq_sta->total_success > lq_sta->max_success_limit) ||
1698 ((!lq_sta->search_better_tbl) &&
1699 (lq_sta->flush_timer) && (flush_interval_passed))) {
1700 IWL_DEBUG_RATE(mvm,
1701 "LQ: stay is expired %d %d %d\n",
1702 lq_sta->total_failed,
1703 lq_sta->total_success,
1704 flush_interval_passed);
1705
1706 /* Allow search for new mode */
1707 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1708 IWL_DEBUG_RATE(mvm,
1709 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1710 lq_sta->total_failed = 0;
1711 lq_sta->total_success = 0;
1712 lq_sta->flush_timer = 0;
1713 /* mark the current column as visited */
1714 lq_sta->visited_columns = BIT(tbl->column);
1715 /*
1716 * Else if we've used this modulation mode enough repetitions
1717 * (regardless of elapsed time or success/failure), reset
1718 * history bitmaps and rate-specific stats for all rates in
1719 * active table.
1720 */
1721 } else {
1722 lq_sta->table_count++;
1723 if (lq_sta->table_count >=
1724 lq_sta->table_count_limit) {
1725 lq_sta->table_count = 0;
1726
1727 IWL_DEBUG_RATE(mvm,
1728 "LQ: stay in table clear win\n");
1729 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1730 }
1731 }
1732
1733 /* If transitioning to allow "search", reset all history
1734 * bitmaps and stats in active table (this will become the new
1735 * "search" table). */
1736 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1737 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1738 }
1739 }
1740 }
1741
rs_set_amsdu_len(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl,enum rs_action scale_action)1742 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1743 struct iwl_scale_tbl_info *tbl,
1744 enum rs_action scale_action)
1745 {
1746 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1747
1748 /*
1749 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1750 * or 0, since there is no per-TID alg.
1751 */
1752 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1753 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1754 scale_action == RS_ACTION_DOWNSCALE)
1755 mvmsta->amsdu_enabled = 0;
1756 else
1757 mvmsta->amsdu_enabled = 0xFFFF;
1758
1759 mvmsta->max_amsdu_len = sta->max_amsdu_len;
1760 }
1761
1762 /*
1763 * setup rate table in uCode
1764 */
rs_update_rate_tbl(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)1765 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1766 struct ieee80211_sta *sta,
1767 struct iwl_lq_sta *lq_sta,
1768 struct iwl_scale_tbl_info *tbl)
1769 {
1770 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1771 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1772 }
1773
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)1774 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1775 struct ieee80211_sta *sta,
1776 struct iwl_lq_sta *lq_sta,
1777 struct iwl_scale_tbl_info *tbl,
1778 enum rs_action scale_action)
1779 {
1780 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1781 return false;
1782
1783 if (!is_vht_siso(&tbl->rate))
1784 return false;
1785
1786 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1787 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1788 (scale_action == RS_ACTION_DOWNSCALE)) {
1789 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1790 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1791 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1792 goto tweaked;
1793 }
1794
1795 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1796 * sustainable, i.e. we're past the test window. We can't go back
1797 * if MCS5 is just tested as this will happen always after switching
1798 * to 20Mhz MCS4 because the rate stats are cleared.
1799 */
1800 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1801 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1802 (scale_action == RS_ACTION_STAY)) ||
1803 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1804 (scale_action == RS_ACTION_UPSCALE)))) {
1805 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1806 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1807 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1808 goto tweaked;
1809 }
1810
1811 return false;
1812
1813 tweaked:
1814 rs_set_expected_tpt_table(lq_sta, tbl);
1815 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1816 return true;
1817 }
1818
rs_get_next_column(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct ieee80211_sta * sta,struct iwl_scale_tbl_info * tbl)1819 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1820 struct iwl_lq_sta *lq_sta,
1821 struct ieee80211_sta *sta,
1822 struct iwl_scale_tbl_info *tbl)
1823 {
1824 int i, j, max_rate;
1825 enum rs_column next_col_id;
1826 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1827 const struct rs_tx_column *next_col;
1828 allow_column_func_t allow_func;
1829 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1830 const u16 *expected_tpt_tbl;
1831 u16 tpt, max_expected_tpt;
1832
1833 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1834 next_col_id = curr_col->next_columns[i];
1835
1836 if (next_col_id == RS_COLUMN_INVALID)
1837 continue;
1838
1839 if (lq_sta->visited_columns & BIT(next_col_id)) {
1840 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1841 next_col_id);
1842 continue;
1843 }
1844
1845 next_col = &rs_tx_columns[next_col_id];
1846
1847 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1848 IWL_DEBUG_RATE(mvm,
1849 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1850 next_col_id, valid_ants, next_col->ant);
1851 continue;
1852 }
1853
1854 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1855 allow_func = next_col->checks[j];
1856 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1857 next_col))
1858 break;
1859 }
1860
1861 if (j != MAX_COLUMN_CHECKS) {
1862 IWL_DEBUG_RATE(mvm,
1863 "Skip column %d: not allowed (check %d failed)\n",
1864 next_col_id, j);
1865
1866 continue;
1867 }
1868
1869 tpt = lq_sta->last_tpt / 100;
1870 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1871 rs_bw_from_sta_bw(sta));
1872 if (WARN_ON_ONCE(!expected_tpt_tbl))
1873 continue;
1874
1875 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1876 if (max_rate == IWL_RATE_INVALID) {
1877 IWL_DEBUG_RATE(mvm,
1878 "Skip column %d: no rate is allowed in this column\n",
1879 next_col_id);
1880 continue;
1881 }
1882
1883 max_expected_tpt = expected_tpt_tbl[max_rate];
1884 if (tpt >= max_expected_tpt) {
1885 IWL_DEBUG_RATE(mvm,
1886 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1887 next_col_id, max_expected_tpt, tpt);
1888 continue;
1889 }
1890
1891 IWL_DEBUG_RATE(mvm,
1892 "Found potential column %d. Max expected %d current %d\n",
1893 next_col_id, max_expected_tpt, tpt);
1894 break;
1895 }
1896
1897 if (i == MAX_NEXT_COLUMNS)
1898 return RS_COLUMN_INVALID;
1899
1900 return next_col_id;
1901 }
1902
rs_switch_to_column(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta,struct ieee80211_sta * sta,enum rs_column col_id)1903 static int rs_switch_to_column(struct iwl_mvm *mvm,
1904 struct iwl_lq_sta *lq_sta,
1905 struct ieee80211_sta *sta,
1906 enum rs_column col_id)
1907 {
1908 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1909 struct iwl_scale_tbl_info *search_tbl =
1910 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1911 struct rs_rate *rate = &search_tbl->rate;
1912 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1913 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1914 unsigned long rate_mask = 0;
1915 u32 rate_idx = 0;
1916
1917 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1918
1919 rate->sgi = column->sgi;
1920 rate->ant = column->ant;
1921
1922 if (column->mode == RS_LEGACY) {
1923 if (lq_sta->band == NL80211_BAND_5GHZ)
1924 rate->type = LQ_LEGACY_A;
1925 else
1926 rate->type = LQ_LEGACY_G;
1927
1928 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1929 rate->ldpc = false;
1930 rate_mask = lq_sta->active_legacy_rate;
1931 } else if (column->mode == RS_SISO) {
1932 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1933 rate_mask = lq_sta->active_siso_rate;
1934 } else if (column->mode == RS_MIMO2) {
1935 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1936 rate_mask = lq_sta->active_mimo2_rate;
1937 } else {
1938 WARN_ONCE(1, "Bad column mode");
1939 }
1940
1941 if (column->mode != RS_LEGACY) {
1942 rate->bw = rs_bw_from_sta_bw(sta);
1943 rate->ldpc = lq_sta->ldpc;
1944 }
1945
1946 search_tbl->column = col_id;
1947 rs_set_expected_tpt_table(lq_sta, search_tbl);
1948
1949 lq_sta->visited_columns |= BIT(col_id);
1950
1951 /* Get the best matching rate if we're changing modes. e.g.
1952 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1953 */
1954 if (curr_column->mode != column->mode) {
1955 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1956 rate_mask, rate->index);
1957
1958 if ((rate_idx == IWL_RATE_INVALID) ||
1959 !(BIT(rate_idx) & rate_mask)) {
1960 IWL_DEBUG_RATE(mvm,
1961 "can not switch with index %d"
1962 " rate mask %lx\n",
1963 rate_idx, rate_mask);
1964
1965 goto err;
1966 }
1967
1968 rate->index = rate_idx;
1969 }
1970
1971 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1972 col_id, rate->index);
1973
1974 return 0;
1975
1976 err:
1977 rate->type = LQ_NONE;
1978 return -1;
1979 }
1980
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)1981 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1982 struct iwl_scale_tbl_info *tbl,
1983 s32 sr, int low, int high,
1984 int current_tpt,
1985 int low_tpt, int high_tpt)
1986 {
1987 enum rs_action action = RS_ACTION_STAY;
1988
1989 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1990 (current_tpt == 0)) {
1991 IWL_DEBUG_RATE(mvm,
1992 "Decrease rate because of low SR\n");
1993 return RS_ACTION_DOWNSCALE;
1994 }
1995
1996 if ((low_tpt == IWL_INVALID_VALUE) &&
1997 (high_tpt == IWL_INVALID_VALUE) &&
1998 (high != IWL_RATE_INVALID)) {
1999 IWL_DEBUG_RATE(mvm,
2000 "No data about high/low rates. Increase rate\n");
2001 return RS_ACTION_UPSCALE;
2002 }
2003
2004 if ((high_tpt == IWL_INVALID_VALUE) &&
2005 (high != IWL_RATE_INVALID) &&
2006 (low_tpt != IWL_INVALID_VALUE) &&
2007 (low_tpt < current_tpt)) {
2008 IWL_DEBUG_RATE(mvm,
2009 "No data about high rate and low rate is worse. Increase rate\n");
2010 return RS_ACTION_UPSCALE;
2011 }
2012
2013 if ((high_tpt != IWL_INVALID_VALUE) &&
2014 (high_tpt > current_tpt)) {
2015 IWL_DEBUG_RATE(mvm,
2016 "Higher rate is better. Increate rate\n");
2017 return RS_ACTION_UPSCALE;
2018 }
2019
2020 if ((low_tpt != IWL_INVALID_VALUE) &&
2021 (high_tpt != IWL_INVALID_VALUE) &&
2022 (low_tpt < current_tpt) &&
2023 (high_tpt < current_tpt)) {
2024 IWL_DEBUG_RATE(mvm,
2025 "Both high and low are worse. Maintain rate\n");
2026 return RS_ACTION_STAY;
2027 }
2028
2029 if ((low_tpt != IWL_INVALID_VALUE) &&
2030 (low_tpt > current_tpt)) {
2031 IWL_DEBUG_RATE(mvm,
2032 "Lower rate is better\n");
2033 action = RS_ACTION_DOWNSCALE;
2034 goto out;
2035 }
2036
2037 if ((low_tpt == IWL_INVALID_VALUE) &&
2038 (low != IWL_RATE_INVALID)) {
2039 IWL_DEBUG_RATE(mvm,
2040 "No data about lower rate\n");
2041 action = RS_ACTION_DOWNSCALE;
2042 goto out;
2043 }
2044
2045 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2046
2047 out:
2048 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2049 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2050 IWL_DEBUG_RATE(mvm,
2051 "SR is above NO DECREASE. Avoid downscale\n");
2052 action = RS_ACTION_STAY;
2053 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2054 IWL_DEBUG_RATE(mvm,
2055 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2056 action = RS_ACTION_STAY;
2057 } else {
2058 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2059 }
2060 }
2061
2062 return action;
2063 }
2064
rs_stbc_allow(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)2065 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2066 struct iwl_lq_sta *lq_sta)
2067 {
2068 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2069 * supports STBC of at least 1*SS
2070 */
2071 if (!lq_sta->stbc_capable)
2072 return false;
2073
2074 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2075 return false;
2076
2077 return true;
2078 }
2079
rs_get_adjacent_txp(struct iwl_mvm * mvm,int index,int * weaker,int * stronger)2080 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2081 int *weaker, int *stronger)
2082 {
2083 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2084 if (*weaker > TPC_MAX_REDUCTION)
2085 *weaker = TPC_INVALID;
2086
2087 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2088 if (*stronger < 0)
2089 *stronger = TPC_INVALID;
2090 }
2091
rs_tpc_allowed(struct iwl_mvm * mvm,struct ieee80211_vif * vif,struct rs_rate * rate,enum nl80211_band band)2092 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2093 struct rs_rate *rate, enum nl80211_band band)
2094 {
2095 int index = rate->index;
2096 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2097 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2098 !vif->bss_conf.ps);
2099
2100 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2101 cam, sta_ps_disabled);
2102 /*
2103 * allow tpc only if power management is enabled, or bt coex
2104 * activity grade allows it and we are on 2.4Ghz.
2105 */
2106 if ((cam || sta_ps_disabled) &&
2107 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2108 return false;
2109
2110 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2111 if (is_legacy(rate))
2112 return index == IWL_RATE_54M_INDEX;
2113 if (is_ht(rate))
2114 return index == IWL_RATE_MCS_7_INDEX;
2115 if (is_vht(rate))
2116 return index == IWL_RATE_MCS_7_INDEX ||
2117 index == IWL_RATE_MCS_8_INDEX ||
2118 index == IWL_RATE_MCS_9_INDEX;
2119
2120 WARN_ON_ONCE(1);
2121 return false;
2122 }
2123
2124 enum tpc_action {
2125 TPC_ACTION_STAY,
2126 TPC_ACTION_DECREASE,
2127 TPC_ACTION_INCREASE,
2128 TPC_ACTION_NO_RESTIRCTION,
2129 };
2130
rs_get_tpc_action(struct iwl_mvm * mvm,s32 sr,int weak,int strong,int current_tpt,int weak_tpt,int strong_tpt)2131 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2132 s32 sr, int weak, int strong,
2133 int current_tpt,
2134 int weak_tpt, int strong_tpt)
2135 {
2136 /* stay until we have valid tpt */
2137 if (current_tpt == IWL_INVALID_VALUE) {
2138 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2139 return TPC_ACTION_STAY;
2140 }
2141
2142 /* Too many failures, increase txp */
2143 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2144 current_tpt == 0) {
2145 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2146 return TPC_ACTION_NO_RESTIRCTION;
2147 }
2148
2149 /* try decreasing first if applicable */
2150 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2151 weak != TPC_INVALID) {
2152 if (weak_tpt == IWL_INVALID_VALUE &&
2153 (strong_tpt == IWL_INVALID_VALUE ||
2154 current_tpt >= strong_tpt)) {
2155 IWL_DEBUG_RATE(mvm,
2156 "no weak txp measurement. decrease txp\n");
2157 return TPC_ACTION_DECREASE;
2158 }
2159
2160 if (weak_tpt > current_tpt) {
2161 IWL_DEBUG_RATE(mvm,
2162 "lower txp has better tpt. decrease txp\n");
2163 return TPC_ACTION_DECREASE;
2164 }
2165 }
2166
2167 /* next, increase if needed */
2168 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2169 strong != TPC_INVALID) {
2170 if (weak_tpt == IWL_INVALID_VALUE &&
2171 strong_tpt != IWL_INVALID_VALUE &&
2172 current_tpt < strong_tpt) {
2173 IWL_DEBUG_RATE(mvm,
2174 "higher txp has better tpt. increase txp\n");
2175 return TPC_ACTION_INCREASE;
2176 }
2177
2178 if (weak_tpt < current_tpt &&
2179 (strong_tpt == IWL_INVALID_VALUE ||
2180 strong_tpt > current_tpt)) {
2181 IWL_DEBUG_RATE(mvm,
2182 "lower txp has worse tpt. increase txp\n");
2183 return TPC_ACTION_INCREASE;
2184 }
2185 }
2186
2187 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2188 return TPC_ACTION_STAY;
2189 }
2190
rs_tpc_perform(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct iwl_scale_tbl_info * tbl)2191 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2192 struct ieee80211_sta *sta,
2193 struct iwl_lq_sta *lq_sta,
2194 struct iwl_scale_tbl_info *tbl)
2195 {
2196 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2197 struct ieee80211_vif *vif = mvm_sta->vif;
2198 struct ieee80211_chanctx_conf *chanctx_conf;
2199 enum nl80211_band band;
2200 struct iwl_rate_scale_data *window;
2201 struct rs_rate *rate = &tbl->rate;
2202 enum tpc_action action;
2203 s32 sr;
2204 u8 cur = lq_sta->lq.reduced_tpc;
2205 int current_tpt;
2206 int weak, strong;
2207 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2208
2209 #ifdef CONFIG_MAC80211_DEBUGFS
2210 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2211 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2212 lq_sta->pers.dbg_fixed_txp_reduction);
2213 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2214 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2215 }
2216 #endif
2217
2218 rcu_read_lock();
2219 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2220 if (WARN_ON(!chanctx_conf))
2221 band = NUM_NL80211_BANDS;
2222 else
2223 band = chanctx_conf->def.chan->band;
2224 rcu_read_unlock();
2225
2226 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2227 IWL_DEBUG_RATE(mvm,
2228 "tpc is not allowed. remove txp restrictions\n");
2229 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2230 return cur != TPC_NO_REDUCTION;
2231 }
2232
2233 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2234
2235 /* Collect measured throughputs for current and adjacent rates */
2236 window = tbl->tpc_win;
2237 sr = window[cur].success_ratio;
2238 current_tpt = window[cur].average_tpt;
2239 if (weak != TPC_INVALID)
2240 weak_tpt = window[weak].average_tpt;
2241 if (strong != TPC_INVALID)
2242 strong_tpt = window[strong].average_tpt;
2243
2244 IWL_DEBUG_RATE(mvm,
2245 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2246 cur, current_tpt, sr, weak, strong,
2247 weak_tpt, strong_tpt);
2248
2249 action = rs_get_tpc_action(mvm, sr, weak, strong,
2250 current_tpt, weak_tpt, strong_tpt);
2251
2252 /* override actions if we are on the edge */
2253 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2254 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2255 action = TPC_ACTION_STAY;
2256 } else if (strong == TPC_INVALID &&
2257 (action == TPC_ACTION_INCREASE ||
2258 action == TPC_ACTION_NO_RESTIRCTION)) {
2259 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2260 action = TPC_ACTION_STAY;
2261 }
2262
2263 switch (action) {
2264 case TPC_ACTION_DECREASE:
2265 lq_sta->lq.reduced_tpc = weak;
2266 return true;
2267 case TPC_ACTION_INCREASE:
2268 lq_sta->lq.reduced_tpc = strong;
2269 return true;
2270 case TPC_ACTION_NO_RESTIRCTION:
2271 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2272 return true;
2273 case TPC_ACTION_STAY:
2274 /* do nothing */
2275 break;
2276 }
2277 return false;
2278 }
2279
2280 /*
2281 * Do rate scaling and search for new modulation mode.
2282 */
rs_rate_scale_perform(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,int tid,bool ndp)2283 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2284 struct ieee80211_sta *sta,
2285 struct iwl_lq_sta *lq_sta,
2286 int tid, bool ndp)
2287 {
2288 int low = IWL_RATE_INVALID;
2289 int high = IWL_RATE_INVALID;
2290 int index;
2291 struct iwl_rate_scale_data *window = NULL;
2292 int current_tpt = IWL_INVALID_VALUE;
2293 int low_tpt = IWL_INVALID_VALUE;
2294 int high_tpt = IWL_INVALID_VALUE;
2295 u32 fail_count;
2296 enum rs_action scale_action = RS_ACTION_STAY;
2297 u16 rate_mask;
2298 u8 update_lq = 0;
2299 struct iwl_scale_tbl_info *tbl, *tbl1;
2300 u8 active_tbl = 0;
2301 u8 done_search = 0;
2302 u16 high_low;
2303 s32 sr;
2304 u8 prev_agg = lq_sta->is_agg;
2305 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2306 struct rs_rate *rate;
2307
2308 lq_sta->is_agg = !!mvmsta->agg_tids;
2309
2310 /*
2311 * Select rate-scale / modulation-mode table to work with in
2312 * the rest of this function: "search" if searching for better
2313 * modulation mode, or "active" if doing rate scaling within a mode.
2314 */
2315 if (!lq_sta->search_better_tbl)
2316 active_tbl = lq_sta->active_tbl;
2317 else
2318 active_tbl = 1 - lq_sta->active_tbl;
2319
2320 tbl = &(lq_sta->lq_info[active_tbl]);
2321 rate = &tbl->rate;
2322
2323 if (prev_agg != lq_sta->is_agg) {
2324 IWL_DEBUG_RATE(mvm,
2325 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2326 prev_agg, lq_sta->is_agg);
2327 rs_set_expected_tpt_table(lq_sta, tbl);
2328 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2329 }
2330
2331 /* current tx rate */
2332 index = rate->index;
2333
2334 /* rates available for this association, and for modulation mode */
2335 rate_mask = rs_get_supported_rates(lq_sta, rate);
2336
2337 if (!(BIT(index) & rate_mask)) {
2338 IWL_ERR(mvm, "Current Rate is not valid\n");
2339 if (lq_sta->search_better_tbl) {
2340 /* revert to active table if search table is not valid*/
2341 rate->type = LQ_NONE;
2342 lq_sta->search_better_tbl = 0;
2343 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2344 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2345 }
2346 return;
2347 }
2348
2349 /* Get expected throughput table and history window for current rate */
2350 if (!tbl->expected_tpt) {
2351 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2352 return;
2353 }
2354
2355 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2356 window = &(tbl->win[index]);
2357
2358 /*
2359 * If there is not enough history to calculate actual average
2360 * throughput, keep analyzing results of more tx frames, without
2361 * changing rate or mode (bypass most of the rest of this function).
2362 * Set up new rate table in uCode only if old rate is not supported
2363 * in current association (use new rate found above).
2364 */
2365 fail_count = window->counter - window->success_counter;
2366 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2367 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2368 IWL_DEBUG_RATE(mvm,
2369 "%s: Test Window: succ %d total %d\n",
2370 rs_pretty_rate(rate),
2371 window->success_counter, window->counter);
2372
2373 /* Can't calculate this yet; not enough history */
2374 window->average_tpt = IWL_INVALID_VALUE;
2375
2376 /* Should we stay with this modulation mode,
2377 * or search for a new one? */
2378 rs_stay_in_table(lq_sta, false);
2379
2380 return;
2381 }
2382
2383 /* If we are searching for better modulation mode, check success. */
2384 if (lq_sta->search_better_tbl) {
2385 /* If good success, continue using the "search" mode;
2386 * no need to send new link quality command, since we're
2387 * continuing to use the setup that we've been trying. */
2388 if (window->average_tpt > lq_sta->last_tpt) {
2389 IWL_DEBUG_RATE(mvm,
2390 "SWITCHING TO NEW TABLE SR: %d "
2391 "cur-tpt %d old-tpt %d\n",
2392 window->success_ratio,
2393 window->average_tpt,
2394 lq_sta->last_tpt);
2395
2396 /* Swap tables; "search" becomes "active" */
2397 lq_sta->active_tbl = active_tbl;
2398 current_tpt = window->average_tpt;
2399 /* Else poor success; go back to mode in "active" table */
2400 } else {
2401 IWL_DEBUG_RATE(mvm,
2402 "GOING BACK TO THE OLD TABLE: SR %d "
2403 "cur-tpt %d old-tpt %d\n",
2404 window->success_ratio,
2405 window->average_tpt,
2406 lq_sta->last_tpt);
2407
2408 /* Nullify "search" table */
2409 rate->type = LQ_NONE;
2410
2411 /* Revert to "active" table */
2412 active_tbl = lq_sta->active_tbl;
2413 tbl = &(lq_sta->lq_info[active_tbl]);
2414
2415 /* Revert to "active" rate and throughput info */
2416 index = tbl->rate.index;
2417 current_tpt = lq_sta->last_tpt;
2418
2419 /* Need to set up a new rate table in uCode */
2420 update_lq = 1;
2421 }
2422
2423 /* Either way, we've made a decision; modulation mode
2424 * search is done, allow rate adjustment next time. */
2425 lq_sta->search_better_tbl = 0;
2426 done_search = 1; /* Don't switch modes below! */
2427 goto lq_update;
2428 }
2429
2430 /* (Else) not in search of better modulation mode, try for better
2431 * starting rate, while staying in this mode. */
2432 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2433 low = high_low & 0xff;
2434 high = (high_low >> 8) & 0xff;
2435
2436 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2437
2438 sr = window->success_ratio;
2439
2440 /* Collect measured throughputs for current and adjacent rates */
2441 current_tpt = window->average_tpt;
2442 if (low != IWL_RATE_INVALID)
2443 low_tpt = tbl->win[low].average_tpt;
2444 if (high != IWL_RATE_INVALID)
2445 high_tpt = tbl->win[high].average_tpt;
2446
2447 IWL_DEBUG_RATE(mvm,
2448 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2449 rs_pretty_rate(rate), current_tpt, sr,
2450 low, high, low_tpt, high_tpt);
2451
2452 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2453 current_tpt, low_tpt, high_tpt);
2454
2455 /* Force a search in case BT doesn't like us being in MIMO */
2456 if (is_mimo(rate) &&
2457 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2458 IWL_DEBUG_RATE(mvm,
2459 "BT Coex forbids MIMO. Search for new config\n");
2460 rs_stay_in_table(lq_sta, true);
2461 goto lq_update;
2462 }
2463
2464 switch (scale_action) {
2465 case RS_ACTION_DOWNSCALE:
2466 /* Decrease starting rate, update uCode's rate table */
2467 if (low != IWL_RATE_INVALID) {
2468 update_lq = 1;
2469 index = low;
2470 } else {
2471 IWL_DEBUG_RATE(mvm,
2472 "At the bottom rate. Can't decrease\n");
2473 }
2474
2475 break;
2476 case RS_ACTION_UPSCALE:
2477 /* Increase starting rate, update uCode's rate table */
2478 if (high != IWL_RATE_INVALID) {
2479 update_lq = 1;
2480 index = high;
2481 } else {
2482 IWL_DEBUG_RATE(mvm,
2483 "At the top rate. Can't increase\n");
2484 }
2485
2486 break;
2487 case RS_ACTION_STAY:
2488 /* No change */
2489 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2490 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2491 break;
2492 default:
2493 break;
2494 }
2495
2496 lq_update:
2497 /* Replace uCode's rate table for the destination station. */
2498 if (update_lq) {
2499 tbl->rate.index = index;
2500 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2501 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2502 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2503 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2504 }
2505
2506 rs_stay_in_table(lq_sta, false);
2507
2508 /*
2509 * Search for new modulation mode if we're:
2510 * 1) Not changing rates right now
2511 * 2) Not just finishing up a search
2512 * 3) Allowing a new search
2513 */
2514 if (!update_lq && !done_search &&
2515 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2516 && window->counter) {
2517 enum rs_column next_column;
2518
2519 /* Save current throughput to compare with "search" throughput*/
2520 lq_sta->last_tpt = current_tpt;
2521
2522 IWL_DEBUG_RATE(mvm,
2523 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2524 update_lq, done_search, lq_sta->rs_state,
2525 window->counter);
2526
2527 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2528 if (next_column != RS_COLUMN_INVALID) {
2529 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2530 next_column);
2531 if (!ret)
2532 lq_sta->search_better_tbl = 1;
2533 } else {
2534 IWL_DEBUG_RATE(mvm,
2535 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2536 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2537 }
2538
2539 /* If new "search" mode was selected, set up in uCode table */
2540 if (lq_sta->search_better_tbl) {
2541 /* Access the "search" table, clear its history. */
2542 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2543 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2544
2545 /* Use new "search" start rate */
2546 index = tbl->rate.index;
2547
2548 rs_dump_rate(mvm, &tbl->rate,
2549 "Switch to SEARCH TABLE:");
2550 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2551 } else {
2552 done_search = 1;
2553 }
2554 }
2555
2556 if (!ndp)
2557 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2558
2559 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2560 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2561 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2562 }
2563 }
2564
2565 struct rs_init_rate_info {
2566 s8 rssi;
2567 u8 rate_idx;
2568 };
2569
2570 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2571 { -60, IWL_RATE_54M_INDEX },
2572 { -64, IWL_RATE_48M_INDEX },
2573 { -68, IWL_RATE_36M_INDEX },
2574 { -80, IWL_RATE_24M_INDEX },
2575 { -84, IWL_RATE_18M_INDEX },
2576 { -85, IWL_RATE_12M_INDEX },
2577 { -86, IWL_RATE_11M_INDEX },
2578 { -88, IWL_RATE_5M_INDEX },
2579 { -90, IWL_RATE_2M_INDEX },
2580 { S8_MIN, IWL_RATE_1M_INDEX },
2581 };
2582
2583 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2584 { -60, IWL_RATE_54M_INDEX },
2585 { -64, IWL_RATE_48M_INDEX },
2586 { -72, IWL_RATE_36M_INDEX },
2587 { -80, IWL_RATE_24M_INDEX },
2588 { -84, IWL_RATE_18M_INDEX },
2589 { -85, IWL_RATE_12M_INDEX },
2590 { -87, IWL_RATE_9M_INDEX },
2591 { S8_MIN, IWL_RATE_6M_INDEX },
2592 };
2593
2594 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2595 { -60, IWL_RATE_MCS_7_INDEX },
2596 { -64, IWL_RATE_MCS_6_INDEX },
2597 { -68, IWL_RATE_MCS_5_INDEX },
2598 { -72, IWL_RATE_MCS_4_INDEX },
2599 { -80, IWL_RATE_MCS_3_INDEX },
2600 { -84, IWL_RATE_MCS_2_INDEX },
2601 { -85, IWL_RATE_MCS_1_INDEX },
2602 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2603 };
2604
2605 /* MCS index 9 is not valid for 20MHz VHT channel width,
2606 * but is ok for 40, 80 and 160MHz channels.
2607 */
2608 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2609 { -60, IWL_RATE_MCS_8_INDEX },
2610 { -64, IWL_RATE_MCS_7_INDEX },
2611 { -68, IWL_RATE_MCS_6_INDEX },
2612 { -72, IWL_RATE_MCS_5_INDEX },
2613 { -80, IWL_RATE_MCS_4_INDEX },
2614 { -84, IWL_RATE_MCS_3_INDEX },
2615 { -85, IWL_RATE_MCS_2_INDEX },
2616 { -87, IWL_RATE_MCS_1_INDEX },
2617 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2618 };
2619
2620 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2621 { -60, IWL_RATE_MCS_9_INDEX },
2622 { -64, IWL_RATE_MCS_8_INDEX },
2623 { -68, IWL_RATE_MCS_7_INDEX },
2624 { -72, IWL_RATE_MCS_6_INDEX },
2625 { -80, IWL_RATE_MCS_5_INDEX },
2626 { -84, IWL_RATE_MCS_4_INDEX },
2627 { -85, IWL_RATE_MCS_3_INDEX },
2628 { -87, IWL_RATE_MCS_2_INDEX },
2629 { -88, IWL_RATE_MCS_1_INDEX },
2630 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2631 };
2632
2633 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2634
2635 /* Init the optimal rate based on STA caps
2636 * This combined with rssi is used to report the last tx rate
2637 * to userspace when we haven't transmitted enough frames.
2638 */
rs_init_optimal_rate(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta)2639 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2640 struct ieee80211_sta *sta,
2641 struct iwl_lq_sta *lq_sta)
2642 {
2643 struct rs_rate *rate = &lq_sta->optimal_rate;
2644
2645 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2646 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2647 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2648 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2649 else if (lq_sta->band == NL80211_BAND_5GHZ)
2650 rate->type = LQ_LEGACY_A;
2651 else
2652 rate->type = LQ_LEGACY_G;
2653
2654 rate->bw = rs_bw_from_sta_bw(sta);
2655 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2656
2657 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2658
2659 if (is_mimo(rate)) {
2660 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2661 } else if (is_siso(rate)) {
2662 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2663 } else {
2664 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2665
2666 if (lq_sta->band == NL80211_BAND_5GHZ) {
2667 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2668 lq_sta->optimal_nentries =
2669 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2670 } else {
2671 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2672 lq_sta->optimal_nentries =
2673 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2674 }
2675 }
2676
2677 if (is_vht(rate)) {
2678 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2679 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2680 lq_sta->optimal_nentries =
2681 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2682 } else {
2683 lq_sta->optimal_rates = rs_optimal_rates_vht;
2684 lq_sta->optimal_nentries =
2685 ARRAY_SIZE(rs_optimal_rates_vht);
2686 }
2687 } else if (is_ht(rate)) {
2688 lq_sta->optimal_rates = rs_optimal_rates_ht;
2689 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2690 }
2691 }
2692
2693 /* Compute the optimal rate index based on RSSI */
rs_get_optimal_rate(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta)2694 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2695 struct iwl_lq_sta *lq_sta)
2696 {
2697 struct rs_rate *rate = &lq_sta->optimal_rate;
2698 int i;
2699
2700 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2701 BITS_PER_LONG);
2702
2703 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2704 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2705
2706 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2707 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2708 rate->index = rate_idx;
2709 break;
2710 }
2711 }
2712
2713 return rate;
2714 }
2715
2716 /* Choose an initial legacy rate and antenna to use based on the RSSI
2717 * of last Rx
2718 */
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)2719 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2720 struct ieee80211_sta *sta,
2721 struct iwl_lq_sta *lq_sta,
2722 enum nl80211_band band,
2723 struct rs_rate *rate)
2724 {
2725 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2726 int i, nentries;
2727 unsigned long active_rate;
2728 s8 best_rssi = S8_MIN;
2729 u8 best_ant = ANT_NONE;
2730 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2731 const struct rs_init_rate_info *initial_rates;
2732
2733 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2734 if (!(lq_sta->pers.chains & BIT(i)))
2735 continue;
2736
2737 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2738 best_rssi = lq_sta->pers.chain_signal[i];
2739 best_ant = BIT(i);
2740 }
2741 }
2742
2743 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2744 rs_pretty_ant(best_ant), best_rssi);
2745
2746 if (best_ant != ANT_A && best_ant != ANT_B)
2747 rate->ant = first_antenna(valid_tx_ant);
2748 else
2749 rate->ant = best_ant;
2750
2751 rate->sgi = false;
2752 rate->ldpc = false;
2753 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2754
2755 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2756 BITS_PER_LONG);
2757
2758 if (band == NL80211_BAND_5GHZ) {
2759 rate->type = LQ_LEGACY_A;
2760 initial_rates = rs_optimal_rates_5ghz_legacy;
2761 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2762 } else {
2763 rate->type = LQ_LEGACY_G;
2764 initial_rates = rs_optimal_rates_24ghz_legacy;
2765 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2766 }
2767
2768 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2769 goto out;
2770
2771 /* Start from a higher rate if the corresponding debug capability
2772 * is enabled. The rate is chosen according to AP capabilities.
2773 * In case of VHT/HT when the rssi is low fallback to the case of
2774 * legacy rates.
2775 */
2776 if (sta->vht_cap.vht_supported &&
2777 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2778 /*
2779 * In AP mode, when a new station associates, rs is initialized
2780 * immediately upon association completion, before the phy
2781 * context is updated with the association parameters, so the
2782 * sta bandwidth might be wider than the phy context allows.
2783 * To avoid this issue, always initialize rs with 20mhz
2784 * bandwidth rate, and after authorization, when the phy context
2785 * is already up-to-date, re-init rs with the correct bw.
2786 */
2787 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2788 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2789
2790 switch (bw) {
2791 case RATE_MCS_CHAN_WIDTH_40:
2792 case RATE_MCS_CHAN_WIDTH_80:
2793 case RATE_MCS_CHAN_WIDTH_160:
2794 initial_rates = rs_optimal_rates_vht;
2795 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2796 break;
2797 case RATE_MCS_CHAN_WIDTH_20:
2798 initial_rates = rs_optimal_rates_vht_20mhz;
2799 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2800 break;
2801 default:
2802 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2803 goto out;
2804 }
2805
2806 active_rate = lq_sta->active_siso_rate;
2807 rate->type = LQ_VHT_SISO;
2808 rate->bw = bw;
2809 } else if (sta->ht_cap.ht_supported &&
2810 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2811 initial_rates = rs_optimal_rates_ht;
2812 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2813 active_rate = lq_sta->active_siso_rate;
2814 rate->type = LQ_HT_SISO;
2815 } else {
2816 active_rate = lq_sta->active_legacy_rate;
2817 }
2818
2819 for (i = 0; i < nentries; i++) {
2820 int rate_idx = initial_rates[i].rate_idx;
2821
2822 if ((best_rssi >= initial_rates[i].rssi) &&
2823 (BIT(rate_idx) & active_rate)) {
2824 rate->index = rate_idx;
2825 break;
2826 }
2827 }
2828
2829 out:
2830 rs_dump_rate(mvm, rate, "INITIAL");
2831 }
2832
2833 /* 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)2834 void rs_update_last_rssi(struct iwl_mvm *mvm,
2835 struct iwl_mvm_sta *mvmsta,
2836 struct ieee80211_rx_status *rx_status)
2837 {
2838 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2839 int i;
2840
2841 lq_sta->pers.chains = rx_status->chains;
2842 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2843 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2844 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2845 lq_sta->pers.last_rssi = S8_MIN;
2846
2847 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2848 if (!(lq_sta->pers.chains & BIT(i)))
2849 continue;
2850
2851 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2852 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2853 }
2854 }
2855
2856 /**
2857 * rs_initialize_lq - Initialize a station's hardware rate table
2858 *
2859 * The uCode's station table contains a table of fallback rates
2860 * for automatic fallback during transmission.
2861 *
2862 * NOTE: This sets up a default set of values. These will be replaced later
2863 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2864 * rc80211_simple.
2865 *
2866 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2867 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2868 * which requires station table entry to exist).
2869 */
rs_initialize_lq(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,enum nl80211_band band,bool update)2870 static void rs_initialize_lq(struct iwl_mvm *mvm,
2871 struct ieee80211_sta *sta,
2872 struct iwl_lq_sta *lq_sta,
2873 enum nl80211_band band, bool update)
2874 {
2875 struct iwl_scale_tbl_info *tbl;
2876 struct rs_rate *rate;
2877 u8 active_tbl = 0;
2878
2879 if (!sta || !lq_sta)
2880 return;
2881
2882 if (!lq_sta->search_better_tbl)
2883 active_tbl = lq_sta->active_tbl;
2884 else
2885 active_tbl = 1 - lq_sta->active_tbl;
2886
2887 tbl = &(lq_sta->lq_info[active_tbl]);
2888 rate = &tbl->rate;
2889
2890 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2891 rs_init_optimal_rate(mvm, sta, lq_sta);
2892
2893 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2894 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2895 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2896 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2897
2898 tbl->column = rs_get_column_from_rate(rate);
2899
2900 rs_set_expected_tpt_table(lq_sta, tbl);
2901 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2902 /* TODO restore station should remember the lq cmd */
2903 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, !update);
2904 }
2905
rs_drv_get_rate(void * mvm_r,struct ieee80211_sta * sta,void * mvm_sta,struct ieee80211_tx_rate_control * txrc)2906 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2907 void *mvm_sta,
2908 struct ieee80211_tx_rate_control *txrc)
2909 {
2910 struct iwl_op_mode *op_mode = mvm_r;
2911 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2912 struct sk_buff *skb = txrc->skb;
2913 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2914 struct iwl_lq_sta *lq_sta;
2915 struct rs_rate *optimal_rate;
2916 u32 last_ucode_rate;
2917
2918 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2919 /* if vif isn't initialized mvm doesn't know about
2920 * this station, so don't do anything with the it
2921 */
2922 sta = NULL;
2923 mvm_sta = NULL;
2924 }
2925
2926 /* Send management frames and NO_ACK data using lowest rate. */
2927 if (rate_control_send_low(sta, mvm_sta, txrc))
2928 return;
2929
2930 if (!mvm_sta)
2931 return;
2932
2933 lq_sta = mvm_sta;
2934 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2935 info->band, &info->control.rates[0]);
2936 info->control.rates[0].count = 1;
2937
2938 /* Report the optimal rate based on rssi and STA caps if we haven't
2939 * converged yet (too little traffic) or exploring other modulations
2940 */
2941 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2942 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2943 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2944 optimal_rate);
2945 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2946 &txrc->reported_rate);
2947 }
2948 }
2949
rs_drv_alloc_sta(void * mvm_rate,struct ieee80211_sta * sta,gfp_t gfp)2950 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2951 gfp_t gfp)
2952 {
2953 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2954 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2955 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2956 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2957
2958 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2959
2960 lq_sta->pers.drv = mvm;
2961 #ifdef CONFIG_MAC80211_DEBUGFS
2962 lq_sta->pers.dbg_fixed_rate = 0;
2963 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2964 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2965 #endif
2966 lq_sta->pers.chains = 0;
2967 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2968 lq_sta->pers.last_rssi = S8_MIN;
2969
2970 return lq_sta;
2971 }
2972
rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap * vht_cap,int nss)2973 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2974 int nss)
2975 {
2976 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2977 (0x3 << (2 * (nss - 1)));
2978 rx_mcs >>= (2 * (nss - 1));
2979
2980 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2981 return IWL_RATE_MCS_7_INDEX;
2982 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2983 return IWL_RATE_MCS_8_INDEX;
2984 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2985 return IWL_RATE_MCS_9_INDEX;
2986
2987 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2988 return -1;
2989 }
2990
rs_vht_set_enabled_rates(struct ieee80211_sta * sta,struct ieee80211_sta_vht_cap * vht_cap,struct iwl_lq_sta * lq_sta)2991 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2992 struct ieee80211_sta_vht_cap *vht_cap,
2993 struct iwl_lq_sta *lq_sta)
2994 {
2995 int i;
2996 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2997
2998 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2999 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3000 if (i == IWL_RATE_9M_INDEX)
3001 continue;
3002
3003 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3004 if (i == IWL_RATE_MCS_9_INDEX &&
3005 sta->bandwidth == IEEE80211_STA_RX_BW_20)
3006 continue;
3007
3008 lq_sta->active_siso_rate |= BIT(i);
3009 }
3010 }
3011
3012 if (sta->rx_nss < 2)
3013 return;
3014
3015 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
3016 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3017 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3018 if (i == IWL_RATE_9M_INDEX)
3019 continue;
3020
3021 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3022 if (i == IWL_RATE_MCS_9_INDEX &&
3023 sta->bandwidth == IEEE80211_STA_RX_BW_20)
3024 continue;
3025
3026 lq_sta->active_mimo2_rate |= BIT(i);
3027 }
3028 }
3029 }
3030
rs_ht_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct ieee80211_sta_ht_cap * ht_cap)3031 static void rs_ht_init(struct iwl_mvm *mvm,
3032 struct ieee80211_sta *sta,
3033 struct iwl_lq_sta *lq_sta,
3034 struct ieee80211_sta_ht_cap *ht_cap)
3035 {
3036 /* active_siso_rate mask includes 9 MBits (bit 5),
3037 * and CCK (bits 0-3), supp_rates[] does not;
3038 * shift to convert format, force 9 MBits off.
3039 */
3040 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3041 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3042 lq_sta->active_siso_rate &= ~((u16)0x2);
3043 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3044
3045 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3046 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3047 lq_sta->active_mimo2_rate &= ~((u16)0x2);
3048 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3049
3050 if (mvm->cfg->ht_params->ldpc &&
3051 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3052 lq_sta->ldpc = true;
3053
3054 if (mvm->cfg->ht_params->stbc &&
3055 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3056 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3057 lq_sta->stbc_capable = true;
3058
3059 lq_sta->is_vht = false;
3060 }
3061
rs_vht_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,struct ieee80211_sta_vht_cap * vht_cap)3062 static void rs_vht_init(struct iwl_mvm *mvm,
3063 struct ieee80211_sta *sta,
3064 struct iwl_lq_sta *lq_sta,
3065 struct ieee80211_sta_vht_cap *vht_cap)
3066 {
3067 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3068
3069 if (mvm->cfg->ht_params->ldpc &&
3070 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3071 lq_sta->ldpc = true;
3072
3073 if (mvm->cfg->ht_params->stbc &&
3074 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3075 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3076 lq_sta->stbc_capable = true;
3077
3078 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3079 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3080 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3081 lq_sta->bfer_capable = true;
3082
3083 lq_sta->is_vht = true;
3084 }
3085
3086 #ifdef CONFIG_IWLWIFI_DEBUGFS
iwl_mvm_reset_frame_stats(struct iwl_mvm * mvm)3087 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3088 {
3089 spin_lock_bh(&mvm->drv_stats_lock);
3090 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3091 spin_unlock_bh(&mvm->drv_stats_lock);
3092 }
3093
iwl_mvm_update_frame_stats(struct iwl_mvm * mvm,u32 rate,bool agg)3094 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3095 {
3096 u8 nss = 0;
3097
3098 spin_lock(&mvm->drv_stats_lock);
3099
3100 if (agg)
3101 mvm->drv_rx_stats.agg_frames++;
3102
3103 mvm->drv_rx_stats.success_frames++;
3104
3105 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3106 case RATE_MCS_CHAN_WIDTH_20:
3107 mvm->drv_rx_stats.bw_20_frames++;
3108 break;
3109 case RATE_MCS_CHAN_WIDTH_40:
3110 mvm->drv_rx_stats.bw_40_frames++;
3111 break;
3112 case RATE_MCS_CHAN_WIDTH_80:
3113 mvm->drv_rx_stats.bw_80_frames++;
3114 break;
3115 case RATE_MCS_CHAN_WIDTH_160:
3116 mvm->drv_rx_stats.bw_160_frames++;
3117 break;
3118 default:
3119 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3120 }
3121
3122 if (rate & RATE_MCS_HT_MSK) {
3123 mvm->drv_rx_stats.ht_frames++;
3124 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3125 } else if (rate & RATE_MCS_VHT_MSK) {
3126 mvm->drv_rx_stats.vht_frames++;
3127 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3128 RATE_VHT_MCS_NSS_POS) + 1;
3129 } else {
3130 mvm->drv_rx_stats.legacy_frames++;
3131 }
3132
3133 if (nss == 1)
3134 mvm->drv_rx_stats.siso_frames++;
3135 else if (nss == 2)
3136 mvm->drv_rx_stats.mimo2_frames++;
3137
3138 if (rate & RATE_MCS_SGI_MSK)
3139 mvm->drv_rx_stats.sgi_frames++;
3140 else
3141 mvm->drv_rx_stats.ngi_frames++;
3142
3143 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3144 mvm->drv_rx_stats.last_frame_idx =
3145 (mvm->drv_rx_stats.last_frame_idx + 1) %
3146 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3147
3148 spin_unlock(&mvm->drv_stats_lock);
3149 }
3150 #endif
3151
3152 /*
3153 * Called after adding a new station to initialize rate scaling
3154 */
rs_drv_rate_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,enum nl80211_band band,bool update)3155 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3156 enum nl80211_band band, bool update)
3157 {
3158 int i, j;
3159 struct ieee80211_hw *hw = mvm->hw;
3160 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3161 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3162 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3163 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3164 struct ieee80211_supported_band *sband;
3165 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3166
3167 /* clear all non-persistent lq data */
3168 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3169
3170 sband = hw->wiphy->bands[band];
3171
3172 lq_sta->lq.sta_id = mvmsta->sta_id;
3173 mvmsta->amsdu_enabled = 0;
3174 mvmsta->max_amsdu_len = sta->max_amsdu_len;
3175
3176 for (j = 0; j < LQ_SIZE; j++)
3177 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3178
3179 lq_sta->flush_timer = 0;
3180 lq_sta->last_tx = jiffies;
3181
3182 IWL_DEBUG_RATE(mvm,
3183 "LQ: *** rate scale station global init for station %d ***\n",
3184 mvmsta->sta_id);
3185 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3186 * the lowest or the highest rate.. Could consider using RSSI from
3187 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3188 * after assoc.. */
3189
3190 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3191 lq_sta->band = sband->band;
3192 /*
3193 * active legacy rates as per supported rates bitmap
3194 */
3195 supp = sta->supp_rates[sband->band];
3196 lq_sta->active_legacy_rate = 0;
3197 for_each_set_bit(i, &supp, BITS_PER_LONG)
3198 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3199
3200 /* TODO: should probably account for rx_highest for both HT/VHT */
3201 if (!vht_cap || !vht_cap->vht_supported)
3202 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3203 else
3204 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3205
3206 lq_sta->max_legacy_rate_idx =
3207 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3208 lq_sta->max_siso_rate_idx =
3209 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3210 lq_sta->max_mimo2_rate_idx =
3211 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3212
3213 IWL_DEBUG_RATE(mvm,
3214 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3215 lq_sta->active_legacy_rate,
3216 lq_sta->active_siso_rate,
3217 lq_sta->active_mimo2_rate,
3218 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3219 lq_sta->bfer_capable);
3220 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3221 lq_sta->max_legacy_rate_idx,
3222 lq_sta->max_siso_rate_idx,
3223 lq_sta->max_mimo2_rate_idx);
3224
3225 /* These values will be overridden later */
3226 lq_sta->lq.single_stream_ant_msk =
3227 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3228 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3229
3230 /* as default allow aggregation for all tids */
3231 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3232 lq_sta->is_agg = 0;
3233 #ifdef CONFIG_IWLWIFI_DEBUGFS
3234 iwl_mvm_reset_frame_stats(mvm);
3235 #endif
3236 rs_initialize_lq(mvm, sta, lq_sta, band, update);
3237 }
3238
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)3239 static void rs_drv_rate_update(void *mvm_r,
3240 struct ieee80211_supported_band *sband,
3241 struct cfg80211_chan_def *chandef,
3242 struct ieee80211_sta *sta,
3243 void *priv_sta, u32 changed)
3244 {
3245 struct iwl_op_mode *op_mode = mvm_r;
3246 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3247 u8 tid;
3248
3249 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3250 return;
3251
3252 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3253 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3254 ieee80211_stop_tx_ba_session(sta, tid);
3255
3256 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3257 }
3258
3259 #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)3260 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3261 struct iwl_lq_cmd *lq_cmd,
3262 enum nl80211_band band,
3263 u32 ucode_rate)
3264 {
3265 struct rs_rate rate;
3266 int i;
3267 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3268 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3269 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3270
3271 for (i = 0; i < num_rates; i++)
3272 lq_cmd->rs_table[i] = ucode_rate_le32;
3273
3274 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3275 WARN_ON_ONCE(1);
3276 return;
3277 }
3278
3279 if (is_mimo(&rate))
3280 lq_cmd->mimo_delim = num_rates - 1;
3281 else
3282 lq_cmd->mimo_delim = 0;
3283
3284 lq_cmd->reduced_tpc = 0;
3285
3286 if (num_of_ant(ant) == 1)
3287 lq_cmd->single_stream_ant_msk = ant;
3288
3289 if (!mvm->trans->cfg->gen2)
3290 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3291 else
3292 lq_cmd->agg_frame_cnt_limit =
3293 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3294 }
3295 #endif /* CONFIG_MAC80211_DEBUGFS */
3296
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)3297 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3298 struct iwl_lq_sta *lq_sta,
3299 struct rs_rate *rate,
3300 __le32 *rs_table, int *rs_table_index,
3301 int num_rates, int num_retries,
3302 u8 valid_tx_ant, bool toggle_ant)
3303 {
3304 int i, j;
3305 __le32 ucode_rate;
3306 bool bottom_reached = false;
3307 int prev_rate_idx = rate->index;
3308 int end = LINK_QUAL_MAX_RETRY_NUM;
3309 int index = *rs_table_index;
3310
3311 for (i = 0; i < num_rates && index < end; i++) {
3312 for (j = 0; j < num_retries && index < end; j++, index++) {
3313 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3314 rate));
3315 rs_table[index] = ucode_rate;
3316 if (toggle_ant)
3317 rs_toggle_antenna(valid_tx_ant, rate);
3318 }
3319
3320 prev_rate_idx = rate->index;
3321 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3322 if (bottom_reached && !is_legacy(rate))
3323 break;
3324 }
3325
3326 if (!bottom_reached && !is_legacy(rate))
3327 rate->index = prev_rate_idx;
3328
3329 *rs_table_index = index;
3330 }
3331
3332 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3333 * column the rate table should look like this:
3334 *
3335 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3336 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3337 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3338 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3339 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3340 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3341 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3342 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3343 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3344 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3345 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3346 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3347 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3348 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3349 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3350 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3351 */
rs_build_rates_table(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,const struct rs_rate * initial_rate)3352 static void rs_build_rates_table(struct iwl_mvm *mvm,
3353 struct ieee80211_sta *sta,
3354 struct iwl_lq_sta *lq_sta,
3355 const struct rs_rate *initial_rate)
3356 {
3357 struct rs_rate rate;
3358 int num_rates, num_retries, index = 0;
3359 u8 valid_tx_ant = 0;
3360 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3361 bool toggle_ant = false;
3362 u32 color;
3363
3364 memcpy(&rate, initial_rate, sizeof(rate));
3365
3366 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3367
3368 /* TODO: remove old API when min FW API hits 14 */
3369 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3370 rs_stbc_allow(mvm, sta, lq_sta))
3371 rate.stbc = true;
3372
3373 if (is_siso(&rate)) {
3374 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3375 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3376 } else if (is_mimo(&rate)) {
3377 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3378 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3379 } else {
3380 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3381 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3382 toggle_ant = true;
3383 }
3384
3385 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3386 num_rates, num_retries, valid_tx_ant,
3387 toggle_ant);
3388
3389 rs_get_lower_rate_down_column(lq_sta, &rate);
3390
3391 if (is_siso(&rate)) {
3392 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3393 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3394 lq_cmd->mimo_delim = index;
3395 } else if (is_legacy(&rate)) {
3396 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3397 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3398 } else {
3399 WARN_ON_ONCE(1);
3400 }
3401
3402 toggle_ant = true;
3403
3404 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3405 num_rates, num_retries, valid_tx_ant,
3406 toggle_ant);
3407
3408 rs_get_lower_rate_down_column(lq_sta, &rate);
3409
3410 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3411 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3412
3413 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3414 num_rates, num_retries, valid_tx_ant,
3415 toggle_ant);
3416
3417 /* update the color of the LQ command (as a counter at bits 1-3) */
3418 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3419 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3420 }
3421
3422 struct rs_bfer_active_iter_data {
3423 struct ieee80211_sta *exclude_sta;
3424 struct iwl_mvm_sta *bfer_mvmsta;
3425 };
3426
rs_bfer_active_iter(void * _data,struct ieee80211_sta * sta)3427 static void rs_bfer_active_iter(void *_data,
3428 struct ieee80211_sta *sta)
3429 {
3430 struct rs_bfer_active_iter_data *data = _data;
3431 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3432 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3433 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3434
3435 if (sta == data->exclude_sta)
3436 return;
3437
3438 /* The current sta has BFER allowed */
3439 if (ss_params & LQ_SS_BFER_ALLOWED) {
3440 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3441
3442 data->bfer_mvmsta = mvmsta;
3443 }
3444 }
3445
rs_bfer_priority(struct iwl_mvm_sta * sta)3446 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3447 {
3448 int prio = -1;
3449 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3450
3451 switch (viftype) {
3452 case NL80211_IFTYPE_AP:
3453 case NL80211_IFTYPE_P2P_GO:
3454 prio = 3;
3455 break;
3456 case NL80211_IFTYPE_P2P_CLIENT:
3457 prio = 2;
3458 break;
3459 case NL80211_IFTYPE_STATION:
3460 prio = 1;
3461 break;
3462 default:
3463 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3464 prio = -1;
3465 }
3466
3467 return prio;
3468 }
3469
3470 /* 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)3471 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3472 struct iwl_mvm_sta *sta2)
3473 {
3474 int prio1 = rs_bfer_priority(sta1);
3475 int prio2 = rs_bfer_priority(sta2);
3476
3477 if (prio1 > prio2)
3478 return 1;
3479 if (prio1 < prio2)
3480 return -1;
3481 return 0;
3482 }
3483
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)3484 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3485 struct ieee80211_sta *sta,
3486 struct iwl_lq_sta *lq_sta,
3487 const struct rs_rate *initial_rate)
3488 {
3489 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3490 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3491 struct rs_bfer_active_iter_data data = {
3492 .exclude_sta = sta,
3493 .bfer_mvmsta = NULL,
3494 };
3495 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3496 u32 ss_params = LQ_SS_PARAMS_VALID;
3497
3498 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3499 goto out;
3500
3501 #ifdef CONFIG_MAC80211_DEBUGFS
3502 /* Check if forcing the decision is configured.
3503 * Note that SISO is forced by not allowing STBC or BFER
3504 */
3505 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3506 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3507 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3508 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3509
3510 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3511 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3512 lq_sta->pers.ss_force);
3513 goto out;
3514 }
3515 #endif
3516
3517 if (lq_sta->stbc_capable)
3518 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3519
3520 if (!lq_sta->bfer_capable)
3521 goto out;
3522
3523 ieee80211_iterate_stations_atomic(mvm->hw,
3524 rs_bfer_active_iter,
3525 &data);
3526 bfer_mvmsta = data.bfer_mvmsta;
3527
3528 /* This code is safe as it doesn't run concurrently for different
3529 * stations. This is guaranteed by the fact that calls to
3530 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3531 */
3532 if (!bfer_mvmsta) {
3533 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3534
3535 ss_params |= LQ_SS_BFER_ALLOWED;
3536 goto out;
3537 }
3538
3539 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3540 bfer_mvmsta->sta_id);
3541
3542 /* Disallow BFER on another STA if active and we're a higher priority */
3543 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3544 struct iwl_lq_cmd *bfersta_lq_cmd =
3545 &bfer_mvmsta->lq_sta.rs_drv.lq;
3546 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3547
3548 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3549 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3550 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3551
3552 ss_params |= LQ_SS_BFER_ALLOWED;
3553 IWL_DEBUG_RATE(mvm,
3554 "Lower priority BFER sta found (%d). Switch BFER\n",
3555 bfer_mvmsta->sta_id);
3556 }
3557 out:
3558 lq_cmd->ss_params = cpu_to_le32(ss_params);
3559 }
3560
rs_fill_lq_cmd(struct iwl_mvm * mvm,struct ieee80211_sta * sta,struct iwl_lq_sta * lq_sta,const struct rs_rate * initial_rate)3561 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3562 struct ieee80211_sta *sta,
3563 struct iwl_lq_sta *lq_sta,
3564 const struct rs_rate *initial_rate)
3565 {
3566 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3567 struct iwl_mvm_sta *mvmsta;
3568 struct iwl_mvm_vif *mvmvif;
3569
3570 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3571 lq_cmd->agg_time_limit =
3572 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3573
3574 #ifdef CONFIG_MAC80211_DEBUGFS
3575 if (lq_sta->pers.dbg_fixed_rate) {
3576 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3577 lq_sta->band,
3578 lq_sta->pers.dbg_fixed_rate);
3579 return;
3580 }
3581 #endif
3582 if (WARN_ON_ONCE(!sta || !initial_rate))
3583 return;
3584
3585 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3586
3587 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3588 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3589
3590 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3591 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3592
3593 if (num_of_ant(initial_rate->ant) == 1)
3594 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3595
3596 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3597
3598 /*
3599 * In case of low latency, tell the firmware to leave a frame in the
3600 * Tx Fifo so that it can start a transaction in the same TxOP. This
3601 * basically allows the firmware to send bursts.
3602 */
3603 if (iwl_mvm_vif_low_latency(mvmvif))
3604 lq_cmd->agg_frame_cnt_limit--;
3605
3606 if (mvmsta->vif->p2p)
3607 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3608
3609 lq_cmd->agg_time_limit =
3610 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3611 }
3612
rs_alloc(struct ieee80211_hw * hw,struct dentry * debugfsdir)3613 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3614 {
3615 return hw->priv;
3616 }
3617
3618 /* rate scale requires free function to be implemented */
rs_free(void * mvm_rate)3619 static void rs_free(void *mvm_rate)
3620 {
3621 return;
3622 }
3623
rs_free_sta(void * mvm_r,struct ieee80211_sta * sta,void * mvm_sta)3624 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3625 {
3626 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3627 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3628
3629 IWL_DEBUG_RATE(mvm, "enter\n");
3630 IWL_DEBUG_RATE(mvm, "leave\n");
3631 }
3632
3633 #ifdef CONFIG_MAC80211_DEBUGFS
rs_pretty_print_rate(char * buf,int bufsz,const u32 rate)3634 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3635 {
3636
3637 char *type, *bw;
3638 u8 mcs = 0, nss = 0;
3639 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3640
3641 if (!(rate & RATE_MCS_HT_MSK) &&
3642 !(rate & RATE_MCS_VHT_MSK) &&
3643 !(rate & RATE_MCS_HE_MSK)) {
3644 int index = iwl_hwrate_to_plcp_idx(rate);
3645
3646 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n",
3647 rs_pretty_ant(ant),
3648 index == IWL_RATE_INVALID ? "BAD" :
3649 iwl_rate_mcs[index].mbps);
3650 }
3651
3652 if (rate & RATE_MCS_VHT_MSK) {
3653 type = "VHT";
3654 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3655 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3656 >> RATE_VHT_MCS_NSS_POS) + 1;
3657 } else if (rate & RATE_MCS_HT_MSK) {
3658 type = "HT";
3659 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3660 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3661 >> RATE_HT_MCS_NSS_POS) + 1;
3662 } else if (rate & RATE_MCS_HE_MSK) {
3663 type = "HE";
3664 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3665 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3666 >> RATE_VHT_MCS_NSS_POS) + 1;
3667 } else {
3668 type = "Unknown"; /* shouldn't happen */
3669 }
3670
3671 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3672 case RATE_MCS_CHAN_WIDTH_20:
3673 bw = "20Mhz";
3674 break;
3675 case RATE_MCS_CHAN_WIDTH_40:
3676 bw = "40Mhz";
3677 break;
3678 case RATE_MCS_CHAN_WIDTH_80:
3679 bw = "80Mhz";
3680 break;
3681 case RATE_MCS_CHAN_WIDTH_160:
3682 bw = "160Mhz";
3683 break;
3684 default:
3685 bw = "BAD BW";
3686 }
3687
3688 return scnprintf(buf, bufsz,
3689 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3690 type, rs_pretty_ant(ant), bw, mcs, nss,
3691 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3692 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3693 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3694 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3695 }
3696
3697 /**
3698 * Program the device to use fixed rate for frame transmit
3699 * This is for debugging/testing only
3700 * once the device start use fixed rate, we need to reload the module
3701 * to being back the normal operation.
3702 */
rs_program_fix_rate(struct iwl_mvm * mvm,struct iwl_lq_sta * lq_sta)3703 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3704 struct iwl_lq_sta *lq_sta)
3705 {
3706 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3707 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3708 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3709
3710 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3711 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3712
3713 if (lq_sta->pers.dbg_fixed_rate) {
3714 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3715 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3716 }
3717 }
3718
rs_sta_dbgfs_scale_table_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)3719 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3720 const char __user *user_buf, size_t count, loff_t *ppos)
3721 {
3722 struct iwl_lq_sta *lq_sta = file->private_data;
3723 struct iwl_mvm *mvm;
3724 char buf[64];
3725 size_t buf_size;
3726 u32 parsed_rate;
3727
3728 mvm = lq_sta->pers.drv;
3729 memset(buf, 0, sizeof(buf));
3730 buf_size = min(count, sizeof(buf) - 1);
3731 if (copy_from_user(buf, user_buf, buf_size))
3732 return -EFAULT;
3733
3734 if (sscanf(buf, "%x", &parsed_rate) == 1)
3735 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3736 else
3737 lq_sta->pers.dbg_fixed_rate = 0;
3738
3739 rs_program_fix_rate(mvm, lq_sta);
3740
3741 return count;
3742 }
3743
rs_sta_dbgfs_scale_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3744 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3745 char __user *user_buf, size_t count, loff_t *ppos)
3746 {
3747 char *buff;
3748 int desc = 0;
3749 int i = 0;
3750 ssize_t ret;
3751 static const size_t bufsz = 2048;
3752
3753 struct iwl_lq_sta *lq_sta = file->private_data;
3754 struct iwl_mvm_sta *mvmsta =
3755 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3756 struct iwl_mvm *mvm;
3757 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3758 struct rs_rate *rate = &tbl->rate;
3759 u32 ss_params;
3760
3761 mvm = lq_sta->pers.drv;
3762 buff = kmalloc(bufsz, GFP_KERNEL);
3763 if (!buff)
3764 return -ENOMEM;
3765
3766 desc += scnprintf(buff + desc, bufsz - desc,
3767 "sta_id %d\n", lq_sta->lq.sta_id);
3768 desc += scnprintf(buff + desc, bufsz - desc,
3769 "failed=%d success=%d rate=0%lX\n",
3770 lq_sta->total_failed, lq_sta->total_success,
3771 lq_sta->active_legacy_rate);
3772 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3773 lq_sta->pers.dbg_fixed_rate);
3774 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3775 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3776 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3777 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3778 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3779 (is_legacy(rate)) ? "legacy" :
3780 is_vht(rate) ? "VHT" : "HT");
3781 if (!is_legacy(rate)) {
3782 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3783 (is_siso(rate)) ? "SISO" : "MIMO2");
3784 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3785 (is_ht20(rate)) ? "20MHz" :
3786 (is_ht40(rate)) ? "40MHz" :
3787 (is_ht80(rate)) ? "80MHz" :
3788 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3789 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3790 (rate->sgi) ? "SGI" : "NGI",
3791 (rate->ldpc) ? "LDPC" : "BCC",
3792 (lq_sta->is_agg) ? "AGG on" : "",
3793 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3794 }
3795 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3796 lq_sta->last_rate_n_flags);
3797 desc += scnprintf(buff + desc, bufsz - desc,
3798 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3799 lq_sta->lq.flags,
3800 lq_sta->lq.mimo_delim,
3801 lq_sta->lq.single_stream_ant_msk,
3802 lq_sta->lq.dual_stream_ant_msk);
3803
3804 desc += scnprintf(buff + desc, bufsz - desc,
3805 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3806 le16_to_cpu(lq_sta->lq.agg_time_limit),
3807 lq_sta->lq.agg_disable_start_th,
3808 lq_sta->lq.agg_frame_cnt_limit);
3809
3810 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3811 lq_sta->lq.reduced_tpc);
3812 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3813 desc += scnprintf(buff + desc, bufsz - desc,
3814 "single stream params: %s%s%s%s\n",
3815 (ss_params & LQ_SS_PARAMS_VALID) ?
3816 "VALID" : "INVALID",
3817 (ss_params & LQ_SS_BFER_ALLOWED) ?
3818 ", BFER" : "",
3819 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3820 ", STBC" : "",
3821 (ss_params & LQ_SS_FORCE) ?
3822 ", FORCE" : "");
3823 desc += scnprintf(buff + desc, bufsz - desc,
3824 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3825 lq_sta->lq.initial_rate_index[0],
3826 lq_sta->lq.initial_rate_index[1],
3827 lq_sta->lq.initial_rate_index[2],
3828 lq_sta->lq.initial_rate_index[3]);
3829
3830 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3831 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3832
3833 desc += scnprintf(buff + desc, bufsz - desc,
3834 " rate[%d] 0x%X ", i, r);
3835 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3836 }
3837
3838 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3839 kfree(buff);
3840 return ret;
3841 }
3842
3843 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3844 .write = rs_sta_dbgfs_scale_table_write,
3845 .read = rs_sta_dbgfs_scale_table_read,
3846 .open = simple_open,
3847 .llseek = default_llseek,
3848 };
rs_sta_dbgfs_stats_table_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3849 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3850 char __user *user_buf, size_t count, loff_t *ppos)
3851 {
3852 char *buff;
3853 int desc = 0;
3854 int i, j;
3855 ssize_t ret;
3856 struct iwl_scale_tbl_info *tbl;
3857 struct rs_rate *rate;
3858 struct iwl_lq_sta *lq_sta = file->private_data;
3859
3860 buff = kmalloc(1024, GFP_KERNEL);
3861 if (!buff)
3862 return -ENOMEM;
3863
3864 for (i = 0; i < LQ_SIZE; i++) {
3865 tbl = &(lq_sta->lq_info[i]);
3866 rate = &tbl->rate;
3867 desc += sprintf(buff+desc,
3868 "%s type=%d SGI=%d BW=%s DUP=0\n"
3869 "index=%d\n",
3870 lq_sta->active_tbl == i ? "*" : "x",
3871 rate->type,
3872 rate->sgi,
3873 is_ht20(rate) ? "20MHz" :
3874 is_ht40(rate) ? "40MHz" :
3875 is_ht80(rate) ? "80MHz" :
3876 is_ht160(rate) ? "160MHz" : "ERR",
3877 rate->index);
3878 for (j = 0; j < IWL_RATE_COUNT; j++) {
3879 desc += sprintf(buff+desc,
3880 "counter=%d success=%d %%=%d\n",
3881 tbl->win[j].counter,
3882 tbl->win[j].success_counter,
3883 tbl->win[j].success_ratio);
3884 }
3885 }
3886 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3887 kfree(buff);
3888 return ret;
3889 }
3890
3891 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3892 .read = rs_sta_dbgfs_stats_table_read,
3893 .open = simple_open,
3894 .llseek = default_llseek,
3895 };
3896
rs_sta_dbgfs_drv_tx_stats_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3897 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3898 char __user *user_buf,
3899 size_t count, loff_t *ppos)
3900 {
3901 static const char * const column_name[] = {
3902 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3903 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3904 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3905 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3906 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3907 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3908 [RS_COLUMN_MIMO2] = "MIMO2",
3909 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3910 };
3911
3912 static const char * const rate_name[] = {
3913 [IWL_RATE_1M_INDEX] = "1M",
3914 [IWL_RATE_2M_INDEX] = "2M",
3915 [IWL_RATE_5M_INDEX] = "5.5M",
3916 [IWL_RATE_11M_INDEX] = "11M",
3917 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3918 [IWL_RATE_9M_INDEX] = "9M",
3919 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3920 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3921 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3922 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3923 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3924 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3925 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3926 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3927 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3928 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3929 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3930 };
3931
3932 char *buff, *pos, *endpos;
3933 int col, rate;
3934 ssize_t ret;
3935 struct iwl_lq_sta *lq_sta = file->private_data;
3936 struct rs_rate_stats *stats;
3937 static const size_t bufsz = 1024;
3938
3939 buff = kmalloc(bufsz, GFP_KERNEL);
3940 if (!buff)
3941 return -ENOMEM;
3942
3943 pos = buff;
3944 endpos = pos + bufsz;
3945
3946 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3947 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3948 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3949 pos += scnprintf(pos, endpos - pos, "\n");
3950
3951 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3952 pos += scnprintf(pos, endpos - pos,
3953 "%s,", column_name[col]);
3954
3955 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3956 stats = &(lq_sta->pers.tx_stats[col][rate]);
3957 pos += scnprintf(pos, endpos - pos,
3958 "%llu/%llu,",
3959 stats->success,
3960 stats->total);
3961 }
3962 pos += scnprintf(pos, endpos - pos, "\n");
3963 }
3964
3965 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3966 kfree(buff);
3967 return ret;
3968 }
3969
rs_sta_dbgfs_drv_tx_stats_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)3970 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3971 const char __user *user_buf,
3972 size_t count, loff_t *ppos)
3973 {
3974 struct iwl_lq_sta *lq_sta = file->private_data;
3975 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3976
3977 return count;
3978 }
3979
3980 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3981 .read = rs_sta_dbgfs_drv_tx_stats_read,
3982 .write = rs_sta_dbgfs_drv_tx_stats_write,
3983 .open = simple_open,
3984 .llseek = default_llseek,
3985 };
3986
iwl_dbgfs_ss_force_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)3987 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3988 char __user *user_buf,
3989 size_t count, loff_t *ppos)
3990 {
3991 struct iwl_lq_sta *lq_sta = file->private_data;
3992 char buf[12];
3993 int bufsz = sizeof(buf);
3994 int pos = 0;
3995 static const char * const ss_force_name[] = {
3996 [RS_SS_FORCE_NONE] = "none",
3997 [RS_SS_FORCE_STBC] = "stbc",
3998 [RS_SS_FORCE_BFER] = "bfer",
3999 [RS_SS_FORCE_SISO] = "siso",
4000 };
4001
4002 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4003 ss_force_name[lq_sta->pers.ss_force]);
4004 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4005 }
4006
iwl_dbgfs_ss_force_write(struct iwl_lq_sta * lq_sta,char * buf,size_t count,loff_t * ppos)4007 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4008 size_t count, loff_t *ppos)
4009 {
4010 struct iwl_mvm *mvm = lq_sta->pers.drv;
4011 int ret = 0;
4012
4013 if (!strncmp("none", buf, 4)) {
4014 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4015 } else if (!strncmp("siso", buf, 4)) {
4016 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4017 } else if (!strncmp("stbc", buf, 4)) {
4018 if (lq_sta->stbc_capable) {
4019 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4020 } else {
4021 IWL_ERR(mvm,
4022 "can't force STBC. peer doesn't support\n");
4023 ret = -EINVAL;
4024 }
4025 } else if (!strncmp("bfer", buf, 4)) {
4026 if (lq_sta->bfer_capable) {
4027 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4028 } else {
4029 IWL_ERR(mvm,
4030 "can't force BFER. peer doesn't support\n");
4031 ret = -EINVAL;
4032 }
4033 } else {
4034 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4035 ret = -EINVAL;
4036 }
4037 return ret ?: count;
4038 }
4039
4040 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4041 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4042 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
4043 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
4044 &iwl_dbgfs_##name##_ops)) \
4045 goto err; \
4046 } while (0)
4047
4048 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4049
rs_drv_add_sta_debugfs(void * mvm,void * priv_sta,struct dentry * dir)4050 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4051 struct dentry *dir)
4052 {
4053 struct iwl_lq_sta *lq_sta = priv_sta;
4054 struct iwl_mvm_sta *mvmsta;
4055
4056 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4057
4058 if (!mvmsta->vif)
4059 return;
4060
4061 debugfs_create_file("rate_scale_table", 0600, dir,
4062 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4063 debugfs_create_file("rate_stats_table", 0400, dir,
4064 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4065 debugfs_create_file("drv_tx_stats", 0600, dir,
4066 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4067 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4068 &lq_sta->tx_agg_tid_en);
4069 debugfs_create_u8("reduced_tpc", 0600, dir,
4070 &lq_sta->pers.dbg_fixed_txp_reduction);
4071
4072 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4073 return;
4074 err:
4075 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4076 }
4077
rs_remove_sta_debugfs(void * mvm,void * mvm_sta)4078 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta)
4079 {
4080 }
4081 #endif
4082
4083 /*
4084 * Initialization of rate scaling information is done by driver after
4085 * the station is added. Since mac80211 calls this function before a
4086 * station is added we ignore it.
4087 */
rs_rate_init_ops(void * mvm_r,struct ieee80211_supported_band * sband,struct cfg80211_chan_def * chandef,struct ieee80211_sta * sta,void * mvm_sta)4088 static void rs_rate_init_ops(void *mvm_r,
4089 struct ieee80211_supported_band *sband,
4090 struct cfg80211_chan_def *chandef,
4091 struct ieee80211_sta *sta, void *mvm_sta)
4092 {
4093 }
4094
4095 /* ops for rate scaling implemented in the driver */
4096 static const struct rate_control_ops rs_mvm_ops_drv = {
4097 .name = RS_NAME,
4098 .tx_status = rs_drv_mac80211_tx_status,
4099 .get_rate = rs_drv_get_rate,
4100 .rate_init = rs_rate_init_ops,
4101 .alloc = rs_alloc,
4102 .free = rs_free,
4103 .alloc_sta = rs_drv_alloc_sta,
4104 .free_sta = rs_free_sta,
4105 .rate_update = rs_drv_rate_update,
4106 #ifdef CONFIG_MAC80211_DEBUGFS
4107 .add_sta_debugfs = rs_drv_add_sta_debugfs,
4108 .remove_sta_debugfs = rs_remove_sta_debugfs,
4109 #endif
4110 };
4111
iwl_mvm_rs_rate_init(struct iwl_mvm * mvm,struct ieee80211_sta * sta,enum nl80211_band band,bool update)4112 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4113 enum nl80211_band band, bool update)
4114 {
4115 if (iwl_mvm_has_tlc_offload(mvm))
4116 rs_fw_rate_init(mvm, sta, band, update);
4117 else
4118 rs_drv_rate_init(mvm, sta, band, update);
4119 }
4120
iwl_mvm_rate_control_register(void)4121 int iwl_mvm_rate_control_register(void)
4122 {
4123 return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4124 }
4125
iwl_mvm_rate_control_unregister(void)4126 void iwl_mvm_rate_control_unregister(void)
4127 {
4128 ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4129 }
4130
rs_drv_tx_protection(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,bool enable)4131 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4132 bool enable)
4133 {
4134 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4135
4136 lockdep_assert_held(&mvm->mutex);
4137
4138 if (enable) {
4139 if (mvmsta->tx_protection == 0)
4140 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4141 mvmsta->tx_protection++;
4142 } else {
4143 mvmsta->tx_protection--;
4144 if (mvmsta->tx_protection == 0)
4145 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4146 }
4147
4148 return iwl_mvm_send_lq_cmd(mvm, lq, false);
4149 }
4150
4151 /**
4152 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4153 * @mvmsta: The station
4154 * @enable: Enable Tx protection?
4155 */
iwl_mvm_tx_protection(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,bool enable)4156 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4157 bool enable)
4158 {
4159 if (iwl_mvm_has_tlc_offload(mvm))
4160 return rs_fw_tx_protection(mvm, mvmsta, enable);
4161 else
4162 return rs_drv_tx_protection(mvm, mvmsta, enable);
4163 }
4164