iwlwifi: mvm: no need to check return value of debugfs_create functions
[muen/linux.git] / drivers / net / wireless / intel / iwlwifi / mvm / rs.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
5  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
6  * Copyright(c) 2018 - 2019 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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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  */
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  */
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
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
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
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 */
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 */
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 */
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
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
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
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  */
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 */
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 */
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
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
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
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  */
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  */
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
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
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
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
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
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
1644 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1645 {
1646         struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap;
1647         struct ieee80211_vht_cap vht_cap = {
1648                 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1649                 .supp_mcs = sta_vht_cap->vht_mcs,
1650         };
1651
1652         switch (sta->bandwidth) {
1653         case IEEE80211_STA_RX_BW_160:
1654                 /*
1655                  * Don't use 160 MHz if VHT extended NSS support
1656                  * says we cannot use 2 streams, we don't want to
1657                  * deal with this.
1658                  * We only check MCS 0 - they will support that if
1659                  * we got here at all and we don't care which MCS,
1660                  * we want to determine a more global state.
1661                  */
1662                 if (ieee80211_get_vht_max_nss(&vht_cap,
1663                                               IEEE80211_VHT_CHANWIDTH_160MHZ,
1664                                               0, true) < sta->rx_nss)
1665                         return RATE_MCS_CHAN_WIDTH_80;
1666                 return RATE_MCS_CHAN_WIDTH_160;
1667         case IEEE80211_STA_RX_BW_80:
1668                 return RATE_MCS_CHAN_WIDTH_80;
1669         case IEEE80211_STA_RX_BW_40:
1670                 return RATE_MCS_CHAN_WIDTH_40;
1671         case IEEE80211_STA_RX_BW_20:
1672         default:
1673                 return RATE_MCS_CHAN_WIDTH_20;
1674         }
1675 }
1676
1677 /*
1678  * Check whether we should continue using same modulation mode, or
1679  * begin search for a new mode, based on:
1680  * 1) # tx successes or failures while using this mode
1681  * 2) # times calling this function
1682  * 3) elapsed time in this mode (not used, for now)
1683  */
1684 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1685 {
1686         struct iwl_scale_tbl_info *tbl;
1687         int active_tbl;
1688         int flush_interval_passed = 0;
1689         struct iwl_mvm *mvm;
1690
1691         mvm = lq_sta->pers.drv;
1692         active_tbl = lq_sta->active_tbl;
1693
1694         tbl = &(lq_sta->lq_info[active_tbl]);
1695
1696         /* If we've been disallowing search, see if we should now allow it */
1697         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1698                 /* Elapsed time using current modulation mode */
1699                 if (lq_sta->flush_timer)
1700                         flush_interval_passed =
1701                                 time_after(jiffies,
1702                                            (unsigned long)(lq_sta->flush_timer +
1703                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1704
1705                 /*
1706                  * Check if we should allow search for new modulation mode.
1707                  * If many frames have failed or succeeded, or we've used
1708                  * this same modulation for a long time, allow search, and
1709                  * reset history stats that keep track of whether we should
1710                  * allow a new search.  Also (below) reset all bitmaps and
1711                  * stats in active history.
1712                  */
1713                 if (force_search ||
1714                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1715                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1716                     ((!lq_sta->search_better_tbl) &&
1717                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1718                         IWL_DEBUG_RATE(mvm,
1719                                        "LQ: stay is expired %d %d %d\n",
1720                                      lq_sta->total_failed,
1721                                      lq_sta->total_success,
1722                                      flush_interval_passed);
1723
1724                         /* Allow search for new mode */
1725                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1726                         IWL_DEBUG_RATE(mvm,
1727                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1728                         lq_sta->total_failed = 0;
1729                         lq_sta->total_success = 0;
1730                         lq_sta->flush_timer = 0;
1731                         /* mark the current column as visited */
1732                         lq_sta->visited_columns = BIT(tbl->column);
1733                 /*
1734                  * Else if we've used this modulation mode enough repetitions
1735                  * (regardless of elapsed time or success/failure), reset
1736                  * history bitmaps and rate-specific stats for all rates in
1737                  * active table.
1738                  */
1739                 } else {
1740                         lq_sta->table_count++;
1741                         if (lq_sta->table_count >=
1742                             lq_sta->table_count_limit) {
1743                                 lq_sta->table_count = 0;
1744
1745                                 IWL_DEBUG_RATE(mvm,
1746                                                "LQ: stay in table clear win\n");
1747                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1748                         }
1749                 }
1750
1751                 /* If transitioning to allow "search", reset all history
1752                  * bitmaps and stats in active table (this will become the new
1753                  * "search" table). */
1754                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1755                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1756                 }
1757         }
1758 }
1759
1760 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1761                              struct iwl_scale_tbl_info *tbl,
1762                              enum rs_action scale_action)
1763 {
1764         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1765         int i;
1766
1767         /*
1768          * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1769          * or 0, since there is no per-TID alg.
1770          */
1771         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1772             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1773             scale_action == RS_ACTION_DOWNSCALE)
1774                 mvmsta->amsdu_enabled = 0;
1775         else
1776                 mvmsta->amsdu_enabled = 0xFFFF;
1777
1778         if (mvmsta->vif->bss_conf.he_support &&
1779             !iwlwifi_mod_params.disable_11ax)
1780                 mvmsta->max_amsdu_len = sta->max_amsdu_len;
1781         else
1782                 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1783
1784         sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1785
1786         for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1787                 if (mvmsta->amsdu_enabled)
1788                         sta->max_tid_amsdu_len[i] =
1789                                 iwl_mvm_max_amsdu_size(mvm, sta, i);
1790                 else
1791                         /*
1792                          * Not so elegant, but this will effectively
1793                          * prevent AMSDU on this TID
1794                          */
1795                         sta->max_tid_amsdu_len[i] = 1;
1796         }
1797 }
1798
1799 /*
1800  * setup rate table in uCode
1801  */
1802 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1803                                struct ieee80211_sta *sta,
1804                                struct iwl_lq_sta *lq_sta,
1805                                struct iwl_scale_tbl_info *tbl)
1806 {
1807         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1808         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1809 }
1810
1811 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1812                               struct ieee80211_sta *sta,
1813                               struct iwl_lq_sta *lq_sta,
1814                               struct iwl_scale_tbl_info *tbl,
1815                               enum rs_action scale_action)
1816 {
1817         if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1818                 return false;
1819
1820         if (!is_vht_siso(&tbl->rate))
1821                 return false;
1822
1823         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1824             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1825             (scale_action == RS_ACTION_DOWNSCALE)) {
1826                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1827                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1828                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1829                 goto tweaked;
1830         }
1831
1832         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1833          * sustainable, i.e. we're past the test window. We can't go back
1834          * if MCS5 is just tested as this will happen always after switching
1835          * to 20Mhz MCS4 because the rate stats are cleared.
1836          */
1837         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1838             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1839              (scale_action == RS_ACTION_STAY)) ||
1840              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1841               (scale_action == RS_ACTION_UPSCALE)))) {
1842                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1843                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1844                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1845                 goto tweaked;
1846         }
1847
1848         return false;
1849
1850 tweaked:
1851         rs_set_expected_tpt_table(lq_sta, tbl);
1852         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1853         return true;
1854 }
1855
1856 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1857                                          struct iwl_lq_sta *lq_sta,
1858                                          struct ieee80211_sta *sta,
1859                                          struct iwl_scale_tbl_info *tbl)
1860 {
1861         int i, j, max_rate;
1862         enum rs_column next_col_id;
1863         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1864         const struct rs_tx_column *next_col;
1865         allow_column_func_t allow_func;
1866         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1867         const u16 *expected_tpt_tbl;
1868         u16 tpt, max_expected_tpt;
1869
1870         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1871                 next_col_id = curr_col->next_columns[i];
1872
1873                 if (next_col_id == RS_COLUMN_INVALID)
1874                         continue;
1875
1876                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1877                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1878                                        next_col_id);
1879                         continue;
1880                 }
1881
1882                 next_col = &rs_tx_columns[next_col_id];
1883
1884                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1885                         IWL_DEBUG_RATE(mvm,
1886                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1887                                        next_col_id, valid_ants, next_col->ant);
1888                         continue;
1889                 }
1890
1891                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1892                         allow_func = next_col->checks[j];
1893                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1894                                                       next_col))
1895                                 break;
1896                 }
1897
1898                 if (j != MAX_COLUMN_CHECKS) {
1899                         IWL_DEBUG_RATE(mvm,
1900                                        "Skip column %d: not allowed (check %d failed)\n",
1901                                        next_col_id, j);
1902
1903                         continue;
1904                 }
1905
1906                 tpt = lq_sta->last_tpt / 100;
1907                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1908                                                      rs_bw_from_sta_bw(sta));
1909                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1910                         continue;
1911
1912                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1913                 if (max_rate == IWL_RATE_INVALID) {
1914                         IWL_DEBUG_RATE(mvm,
1915                                        "Skip column %d: no rate is allowed in this column\n",
1916                                        next_col_id);
1917                         continue;
1918                 }
1919
1920                 max_expected_tpt = expected_tpt_tbl[max_rate];
1921                 if (tpt >= max_expected_tpt) {
1922                         IWL_DEBUG_RATE(mvm,
1923                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1924                                        next_col_id, max_expected_tpt, tpt);
1925                         continue;
1926                 }
1927
1928                 IWL_DEBUG_RATE(mvm,
1929                                "Found potential column %d. Max expected %d current %d\n",
1930                                next_col_id, max_expected_tpt, tpt);
1931                 break;
1932         }
1933
1934         if (i == MAX_NEXT_COLUMNS)
1935                 return RS_COLUMN_INVALID;
1936
1937         return next_col_id;
1938 }
1939
1940 static int rs_switch_to_column(struct iwl_mvm *mvm,
1941                                struct iwl_lq_sta *lq_sta,
1942                                struct ieee80211_sta *sta,
1943                                enum rs_column col_id)
1944 {
1945         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1946         struct iwl_scale_tbl_info *search_tbl =
1947                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1948         struct rs_rate *rate = &search_tbl->rate;
1949         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1950         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1951         unsigned long rate_mask = 0;
1952         u32 rate_idx = 0;
1953
1954         memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1955
1956         rate->sgi = column->sgi;
1957         rate->ant = column->ant;
1958
1959         if (column->mode == RS_LEGACY) {
1960                 if (lq_sta->band == NL80211_BAND_5GHZ)
1961                         rate->type = LQ_LEGACY_A;
1962                 else
1963                         rate->type = LQ_LEGACY_G;
1964
1965                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1966                 rate->ldpc = false;
1967                 rate_mask = lq_sta->active_legacy_rate;
1968         } else if (column->mode == RS_SISO) {
1969                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1970                 rate_mask = lq_sta->active_siso_rate;
1971         } else if (column->mode == RS_MIMO2) {
1972                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1973                 rate_mask = lq_sta->active_mimo2_rate;
1974         } else {
1975                 WARN_ONCE(1, "Bad column mode");
1976         }
1977
1978         if (column->mode != RS_LEGACY) {
1979                 rate->bw = rs_bw_from_sta_bw(sta);
1980                 rate->ldpc = lq_sta->ldpc;
1981         }
1982
1983         search_tbl->column = col_id;
1984         rs_set_expected_tpt_table(lq_sta, search_tbl);
1985
1986         lq_sta->visited_columns |= BIT(col_id);
1987
1988         /* Get the best matching rate if we're changing modes. e.g.
1989          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1990          */
1991         if (curr_column->mode != column->mode) {
1992                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1993                                             rate_mask, rate->index);
1994
1995                 if ((rate_idx == IWL_RATE_INVALID) ||
1996                     !(BIT(rate_idx) & rate_mask)) {
1997                         IWL_DEBUG_RATE(mvm,
1998                                        "can not switch with index %d"
1999                                        " rate mask %lx\n",
2000                                        rate_idx, rate_mask);
2001
2002                         goto err;
2003                 }
2004
2005                 rate->index = rate_idx;
2006         }
2007
2008         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
2009                        col_id, rate->index);
2010
2011         return 0;
2012
2013 err:
2014         rate->type = LQ_NONE;
2015         return -1;
2016 }
2017
2018 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
2019                                          struct iwl_scale_tbl_info *tbl,
2020                                          s32 sr, int low, int high,
2021                                          int current_tpt,
2022                                          int low_tpt, int high_tpt)
2023 {
2024         enum rs_action action = RS_ACTION_STAY;
2025
2026         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
2027             (current_tpt == 0)) {
2028                 IWL_DEBUG_RATE(mvm,
2029                                "Decrease rate because of low SR\n");
2030                 return RS_ACTION_DOWNSCALE;
2031         }
2032
2033         if ((low_tpt == IWL_INVALID_VALUE) &&
2034             (high_tpt == IWL_INVALID_VALUE) &&
2035             (high != IWL_RATE_INVALID)) {
2036                 IWL_DEBUG_RATE(mvm,
2037                                "No data about high/low rates. Increase rate\n");
2038                 return RS_ACTION_UPSCALE;
2039         }
2040
2041         if ((high_tpt == IWL_INVALID_VALUE) &&
2042             (high != IWL_RATE_INVALID) &&
2043             (low_tpt != IWL_INVALID_VALUE) &&
2044             (low_tpt < current_tpt)) {
2045                 IWL_DEBUG_RATE(mvm,
2046                                "No data about high rate and low rate is worse. Increase rate\n");
2047                 return RS_ACTION_UPSCALE;
2048         }
2049
2050         if ((high_tpt != IWL_INVALID_VALUE) &&
2051             (high_tpt > current_tpt)) {
2052                 IWL_DEBUG_RATE(mvm,
2053                                "Higher rate is better. Increate rate\n");
2054                 return RS_ACTION_UPSCALE;
2055         }
2056
2057         if ((low_tpt != IWL_INVALID_VALUE) &&
2058             (high_tpt != IWL_INVALID_VALUE) &&
2059             (low_tpt < current_tpt) &&
2060             (high_tpt < current_tpt)) {
2061                 IWL_DEBUG_RATE(mvm,
2062                                "Both high and low are worse. Maintain rate\n");
2063                 return RS_ACTION_STAY;
2064         }
2065
2066         if ((low_tpt != IWL_INVALID_VALUE) &&
2067             (low_tpt > current_tpt)) {
2068                 IWL_DEBUG_RATE(mvm,
2069                                "Lower rate is better\n");
2070                 action = RS_ACTION_DOWNSCALE;
2071                 goto out;
2072         }
2073
2074         if ((low_tpt == IWL_INVALID_VALUE) &&
2075             (low != IWL_RATE_INVALID)) {
2076                 IWL_DEBUG_RATE(mvm,
2077                                "No data about lower rate\n");
2078                 action = RS_ACTION_DOWNSCALE;
2079                 goto out;
2080         }
2081
2082         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2083
2084 out:
2085         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2086                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2087                         IWL_DEBUG_RATE(mvm,
2088                                        "SR is above NO DECREASE. Avoid downscale\n");
2089                         action = RS_ACTION_STAY;
2090                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2091                         IWL_DEBUG_RATE(mvm,
2092                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2093                         action = RS_ACTION_STAY;
2094                 } else {
2095                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2096                 }
2097         }
2098
2099         return action;
2100 }
2101
2102 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2103                           struct iwl_lq_sta *lq_sta)
2104 {
2105         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2106          * supports STBC of at least 1*SS
2107          */
2108         if (!lq_sta->stbc_capable)
2109                 return false;
2110
2111         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2112                 return false;
2113
2114         return true;
2115 }
2116
2117 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2118                                 int *weaker, int *stronger)
2119 {
2120         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2121         if (*weaker > TPC_MAX_REDUCTION)
2122                 *weaker = TPC_INVALID;
2123
2124         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2125         if (*stronger < 0)
2126                 *stronger = TPC_INVALID;
2127 }
2128
2129 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2130                            struct rs_rate *rate, enum nl80211_band band)
2131 {
2132         int index = rate->index;
2133         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2134         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2135                                 !vif->bss_conf.ps);
2136
2137         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2138                        cam, sta_ps_disabled);
2139         /*
2140          * allow tpc only if power management is enabled, or bt coex
2141          * activity grade allows it and we are on 2.4Ghz.
2142          */
2143         if ((cam || sta_ps_disabled) &&
2144             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2145                 return false;
2146
2147         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2148         if (is_legacy(rate))
2149                 return index == IWL_RATE_54M_INDEX;
2150         if (is_ht(rate))
2151                 return index == IWL_RATE_MCS_7_INDEX;
2152         if (is_vht(rate))
2153                 return index == IWL_RATE_MCS_7_INDEX ||
2154                        index == IWL_RATE_MCS_8_INDEX ||
2155                        index == IWL_RATE_MCS_9_INDEX;
2156
2157         WARN_ON_ONCE(1);
2158         return false;
2159 }
2160
2161 enum tpc_action {
2162         TPC_ACTION_STAY,
2163         TPC_ACTION_DECREASE,
2164         TPC_ACTION_INCREASE,
2165         TPC_ACTION_NO_RESTIRCTION,
2166 };
2167
2168 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2169                                          s32 sr, int weak, int strong,
2170                                          int current_tpt,
2171                                          int weak_tpt, int strong_tpt)
2172 {
2173         /* stay until we have valid tpt */
2174         if (current_tpt == IWL_INVALID_VALUE) {
2175                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2176                 return TPC_ACTION_STAY;
2177         }
2178
2179         /* Too many failures, increase txp */
2180         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2181             current_tpt == 0) {
2182                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2183                 return TPC_ACTION_NO_RESTIRCTION;
2184         }
2185
2186         /* try decreasing first if applicable */
2187         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2188             weak != TPC_INVALID) {
2189                 if (weak_tpt == IWL_INVALID_VALUE &&
2190                     (strong_tpt == IWL_INVALID_VALUE ||
2191                      current_tpt >= strong_tpt)) {
2192                         IWL_DEBUG_RATE(mvm,
2193                                        "no weak txp measurement. decrease txp\n");
2194                         return TPC_ACTION_DECREASE;
2195                 }
2196
2197                 if (weak_tpt > current_tpt) {
2198                         IWL_DEBUG_RATE(mvm,
2199                                        "lower txp has better tpt. decrease txp\n");
2200                         return TPC_ACTION_DECREASE;
2201                 }
2202         }
2203
2204         /* next, increase if needed */
2205         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2206             strong != TPC_INVALID) {
2207                 if (weak_tpt == IWL_INVALID_VALUE &&
2208                     strong_tpt != IWL_INVALID_VALUE &&
2209                     current_tpt < strong_tpt) {
2210                         IWL_DEBUG_RATE(mvm,
2211                                        "higher txp has better tpt. increase txp\n");
2212                         return TPC_ACTION_INCREASE;
2213                 }
2214
2215                 if (weak_tpt < current_tpt &&
2216                     (strong_tpt == IWL_INVALID_VALUE ||
2217                      strong_tpt > current_tpt)) {
2218                         IWL_DEBUG_RATE(mvm,
2219                                        "lower txp has worse tpt. increase txp\n");
2220                         return TPC_ACTION_INCREASE;
2221                 }
2222         }
2223
2224         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2225         return TPC_ACTION_STAY;
2226 }
2227
2228 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2229                            struct ieee80211_sta *sta,
2230                            struct iwl_lq_sta *lq_sta,
2231                            struct iwl_scale_tbl_info *tbl)
2232 {
2233         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2234         struct ieee80211_vif *vif = mvm_sta->vif;
2235         struct ieee80211_chanctx_conf *chanctx_conf;
2236         enum nl80211_band band;
2237         struct iwl_rate_scale_data *window;
2238         struct rs_rate *rate = &tbl->rate;
2239         enum tpc_action action;
2240         s32 sr;
2241         u8 cur = lq_sta->lq.reduced_tpc;
2242         int current_tpt;
2243         int weak, strong;
2244         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2245
2246 #ifdef CONFIG_MAC80211_DEBUGFS
2247         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2248                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2249                                lq_sta->pers.dbg_fixed_txp_reduction);
2250                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2251                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2252         }
2253 #endif
2254
2255         rcu_read_lock();
2256         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2257         if (WARN_ON(!chanctx_conf))
2258                 band = NUM_NL80211_BANDS;
2259         else
2260                 band = chanctx_conf->def.chan->band;
2261         rcu_read_unlock();
2262
2263         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2264                 IWL_DEBUG_RATE(mvm,
2265                                "tpc is not allowed. remove txp restrictions\n");
2266                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2267                 return cur != TPC_NO_REDUCTION;
2268         }
2269
2270         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2271
2272         /* Collect measured throughputs for current and adjacent rates */
2273         window = tbl->tpc_win;
2274         sr = window[cur].success_ratio;
2275         current_tpt = window[cur].average_tpt;
2276         if (weak != TPC_INVALID)
2277                 weak_tpt = window[weak].average_tpt;
2278         if (strong != TPC_INVALID)
2279                 strong_tpt = window[strong].average_tpt;
2280
2281         IWL_DEBUG_RATE(mvm,
2282                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2283                        cur, current_tpt, sr, weak, strong,
2284                        weak_tpt, strong_tpt);
2285
2286         action = rs_get_tpc_action(mvm, sr, weak, strong,
2287                                    current_tpt, weak_tpt, strong_tpt);
2288
2289         /* override actions if we are on the edge */
2290         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2291                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2292                 action = TPC_ACTION_STAY;
2293         } else if (strong == TPC_INVALID &&
2294                    (action == TPC_ACTION_INCREASE ||
2295                     action == TPC_ACTION_NO_RESTIRCTION)) {
2296                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2297                 action = TPC_ACTION_STAY;
2298         }
2299
2300         switch (action) {
2301         case TPC_ACTION_DECREASE:
2302                 lq_sta->lq.reduced_tpc = weak;
2303                 return true;
2304         case TPC_ACTION_INCREASE:
2305                 lq_sta->lq.reduced_tpc = strong;
2306                 return true;
2307         case TPC_ACTION_NO_RESTIRCTION:
2308                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2309                 return true;
2310         case TPC_ACTION_STAY:
2311                 /* do nothing */
2312                 break;
2313         }
2314         return false;
2315 }
2316
2317 /*
2318  * Do rate scaling and search for new modulation mode.
2319  */
2320 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2321                                   struct ieee80211_sta *sta,
2322                                   struct iwl_lq_sta *lq_sta,
2323                                   int tid, bool ndp)
2324 {
2325         int low = IWL_RATE_INVALID;
2326         int high = IWL_RATE_INVALID;
2327         int index;
2328         struct iwl_rate_scale_data *window = NULL;
2329         int current_tpt = IWL_INVALID_VALUE;
2330         int low_tpt = IWL_INVALID_VALUE;
2331         int high_tpt = IWL_INVALID_VALUE;
2332         u32 fail_count;
2333         enum rs_action scale_action = RS_ACTION_STAY;
2334         u16 rate_mask;
2335         u8 update_lq = 0;
2336         struct iwl_scale_tbl_info *tbl, *tbl1;
2337         u8 active_tbl = 0;
2338         u8 done_search = 0;
2339         u16 high_low;
2340         s32 sr;
2341         u8 prev_agg = lq_sta->is_agg;
2342         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2343         struct rs_rate *rate;
2344
2345         lq_sta->is_agg = !!mvmsta->agg_tids;
2346
2347         /*
2348          * Select rate-scale / modulation-mode table to work with in
2349          * the rest of this function:  "search" if searching for better
2350          * modulation mode, or "active" if doing rate scaling within a mode.
2351          */
2352         if (!lq_sta->search_better_tbl)
2353                 active_tbl = lq_sta->active_tbl;
2354         else
2355                 active_tbl = 1 - lq_sta->active_tbl;
2356
2357         tbl = &(lq_sta->lq_info[active_tbl]);
2358         rate = &tbl->rate;
2359
2360         if (prev_agg != lq_sta->is_agg) {
2361                 IWL_DEBUG_RATE(mvm,
2362                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2363                                prev_agg, lq_sta->is_agg);
2364                 rs_set_expected_tpt_table(lq_sta, tbl);
2365                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2366         }
2367
2368         /* current tx rate */
2369         index = rate->index;
2370
2371         /* rates available for this association, and for modulation mode */
2372         rate_mask = rs_get_supported_rates(lq_sta, rate);
2373
2374         if (!(BIT(index) & rate_mask)) {
2375                 IWL_ERR(mvm, "Current Rate is not valid\n");
2376                 if (lq_sta->search_better_tbl) {
2377                         /* revert to active table if search table is not valid*/
2378                         rate->type = LQ_NONE;
2379                         lq_sta->search_better_tbl = 0;
2380                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2381                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2382                 }
2383                 return;
2384         }
2385
2386         /* Get expected throughput table and history window for current rate */
2387         if (!tbl->expected_tpt) {
2388                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2389                 return;
2390         }
2391
2392         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2393         window = &(tbl->win[index]);
2394
2395         /*
2396          * If there is not enough history to calculate actual average
2397          * throughput, keep analyzing results of more tx frames, without
2398          * changing rate or mode (bypass most of the rest of this function).
2399          * Set up new rate table in uCode only if old rate is not supported
2400          * in current association (use new rate found above).
2401          */
2402         fail_count = window->counter - window->success_counter;
2403         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2404             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2405                 IWL_DEBUG_RATE(mvm,
2406                                "%s: Test Window: succ %d total %d\n",
2407                                rs_pretty_rate(rate),
2408                                window->success_counter, window->counter);
2409
2410                 /* Can't calculate this yet; not enough history */
2411                 window->average_tpt = IWL_INVALID_VALUE;
2412
2413                 /* Should we stay with this modulation mode,
2414                  * or search for a new one? */
2415                 rs_stay_in_table(lq_sta, false);
2416
2417                 return;
2418         }
2419
2420         /* If we are searching for better modulation mode, check success. */
2421         if (lq_sta->search_better_tbl) {
2422                 /* If good success, continue using the "search" mode;
2423                  * no need to send new link quality command, since we're
2424                  * continuing to use the setup that we've been trying. */
2425                 if (window->average_tpt > lq_sta->last_tpt) {
2426                         IWL_DEBUG_RATE(mvm,
2427                                        "SWITCHING TO NEW TABLE SR: %d "
2428                                        "cur-tpt %d old-tpt %d\n",
2429                                        window->success_ratio,
2430                                        window->average_tpt,
2431                                        lq_sta->last_tpt);
2432
2433                         /* Swap tables; "search" becomes "active" */
2434                         lq_sta->active_tbl = active_tbl;
2435                         current_tpt = window->average_tpt;
2436                 /* Else poor success; go back to mode in "active" table */
2437                 } else {
2438                         IWL_DEBUG_RATE(mvm,
2439                                        "GOING BACK TO THE OLD TABLE: SR %d "
2440                                        "cur-tpt %d old-tpt %d\n",
2441                                        window->success_ratio,
2442                                        window->average_tpt,
2443                                        lq_sta->last_tpt);
2444
2445                         /* Nullify "search" table */
2446                         rate->type = LQ_NONE;
2447
2448                         /* Revert to "active" table */
2449                         active_tbl = lq_sta->active_tbl;
2450                         tbl = &(lq_sta->lq_info[active_tbl]);
2451
2452                         /* Revert to "active" rate and throughput info */
2453                         index = tbl->rate.index;
2454                         current_tpt = lq_sta->last_tpt;
2455
2456                         /* Need to set up a new rate table in uCode */
2457                         update_lq = 1;
2458                 }
2459
2460                 /* Either way, we've made a decision; modulation mode
2461                  * search is done, allow rate adjustment next time. */
2462                 lq_sta->search_better_tbl = 0;
2463                 done_search = 1;        /* Don't switch modes below! */
2464                 goto lq_update;
2465         }
2466
2467         /* (Else) not in search of better modulation mode, try for better
2468          * starting rate, while staying in this mode. */
2469         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2470         low = high_low & 0xff;
2471         high = (high_low >> 8) & 0xff;
2472
2473         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2474
2475         sr = window->success_ratio;
2476
2477         /* Collect measured throughputs for current and adjacent rates */
2478         current_tpt = window->average_tpt;
2479         if (low != IWL_RATE_INVALID)
2480                 low_tpt = tbl->win[low].average_tpt;
2481         if (high != IWL_RATE_INVALID)
2482                 high_tpt = tbl->win[high].average_tpt;
2483
2484         IWL_DEBUG_RATE(mvm,
2485                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2486                        rs_pretty_rate(rate), current_tpt, sr,
2487                        low, high, low_tpt, high_tpt);
2488
2489         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2490                                           current_tpt, low_tpt, high_tpt);
2491
2492         /* Force a search in case BT doesn't like us being in MIMO */
2493         if (is_mimo(rate) &&
2494             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2495                 IWL_DEBUG_RATE(mvm,
2496                                "BT Coex forbids MIMO. Search for new config\n");
2497                 rs_stay_in_table(lq_sta, true);
2498                 goto lq_update;
2499         }
2500
2501         switch (scale_action) {
2502         case RS_ACTION_DOWNSCALE:
2503                 /* Decrease starting rate, update uCode's rate table */
2504                 if (low != IWL_RATE_INVALID) {
2505                         update_lq = 1;
2506                         index = low;
2507                 } else {
2508                         IWL_DEBUG_RATE(mvm,
2509                                        "At the bottom rate. Can't decrease\n");
2510                 }
2511
2512                 break;
2513         case RS_ACTION_UPSCALE:
2514                 /* Increase starting rate, update uCode's rate table */
2515                 if (high != IWL_RATE_INVALID) {
2516                         update_lq = 1;
2517                         index = high;
2518                 } else {
2519                         IWL_DEBUG_RATE(mvm,
2520                                        "At the top rate. Can't increase\n");
2521                 }
2522
2523                 break;
2524         case RS_ACTION_STAY:
2525                 /* No change */
2526                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2527                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2528                 break;
2529         default:
2530                 break;
2531         }
2532
2533 lq_update:
2534         /* Replace uCode's rate table for the destination station. */
2535         if (update_lq) {
2536                 tbl->rate.index = index;
2537                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2538                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2539                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2540                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2541         }
2542
2543         rs_stay_in_table(lq_sta, false);
2544
2545         /*
2546          * Search for new modulation mode if we're:
2547          * 1)  Not changing rates right now
2548          * 2)  Not just finishing up a search
2549          * 3)  Allowing a new search
2550          */
2551         if (!update_lq && !done_search &&
2552             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2553             && window->counter) {
2554                 enum rs_column next_column;
2555
2556                 /* Save current throughput to compare with "search" throughput*/
2557                 lq_sta->last_tpt = current_tpt;
2558
2559                 IWL_DEBUG_RATE(mvm,
2560                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2561                                update_lq, done_search, lq_sta->rs_state,
2562                                window->counter);
2563
2564                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2565                 if (next_column != RS_COLUMN_INVALID) {
2566                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2567                                                       next_column);
2568                         if (!ret)
2569                                 lq_sta->search_better_tbl = 1;
2570                 } else {
2571                         IWL_DEBUG_RATE(mvm,
2572                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2573                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2574                 }
2575
2576                 /* If new "search" mode was selected, set up in uCode table */
2577                 if (lq_sta->search_better_tbl) {
2578                         /* Access the "search" table, clear its history. */
2579                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2580                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2581
2582                         /* Use new "search" start rate */
2583                         index = tbl->rate.index;
2584
2585                         rs_dump_rate(mvm, &tbl->rate,
2586                                      "Switch to SEARCH TABLE:");
2587                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2588                 } else {
2589                         done_search = 1;
2590                 }
2591         }
2592
2593         if (!ndp)
2594                 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2595
2596         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2597                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2598                 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2599         }
2600 }
2601
2602 struct rs_init_rate_info {
2603         s8 rssi;
2604         u8 rate_idx;
2605 };
2606
2607 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2608         { -60, IWL_RATE_54M_INDEX },
2609         { -64, IWL_RATE_48M_INDEX },
2610         { -68, IWL_RATE_36M_INDEX },
2611         { -80, IWL_RATE_24M_INDEX },
2612         { -84, IWL_RATE_18M_INDEX },
2613         { -85, IWL_RATE_12M_INDEX },
2614         { -86, IWL_RATE_11M_INDEX },
2615         { -88, IWL_RATE_5M_INDEX  },
2616         { -90, IWL_RATE_2M_INDEX  },
2617         { S8_MIN, IWL_RATE_1M_INDEX },
2618 };
2619
2620 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2621         { -60, IWL_RATE_54M_INDEX },
2622         { -64, IWL_RATE_48M_INDEX },
2623         { -72, IWL_RATE_36M_INDEX },
2624         { -80, IWL_RATE_24M_INDEX },
2625         { -84, IWL_RATE_18M_INDEX },
2626         { -85, IWL_RATE_12M_INDEX },
2627         { -87, IWL_RATE_9M_INDEX  },
2628         { S8_MIN, IWL_RATE_6M_INDEX },
2629 };
2630
2631 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2632         { -60, IWL_RATE_MCS_7_INDEX },
2633         { -64, IWL_RATE_MCS_6_INDEX },
2634         { -68, IWL_RATE_MCS_5_INDEX },
2635         { -72, IWL_RATE_MCS_4_INDEX },
2636         { -80, IWL_RATE_MCS_3_INDEX },
2637         { -84, IWL_RATE_MCS_2_INDEX },
2638         { -85, IWL_RATE_MCS_1_INDEX },
2639         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2640 };
2641
2642 /* MCS index 9 is not valid for 20MHz VHT channel width,
2643  * but is ok for 40, 80 and 160MHz channels.
2644  */
2645 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2646         { -60, IWL_RATE_MCS_8_INDEX },
2647         { -64, IWL_RATE_MCS_7_INDEX },
2648         { -68, IWL_RATE_MCS_6_INDEX },
2649         { -72, IWL_RATE_MCS_5_INDEX },
2650         { -80, IWL_RATE_MCS_4_INDEX },
2651         { -84, IWL_RATE_MCS_3_INDEX },
2652         { -85, IWL_RATE_MCS_2_INDEX },
2653         { -87, IWL_RATE_MCS_1_INDEX },
2654         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2655 };
2656
2657 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2658         { -60, IWL_RATE_MCS_9_INDEX },
2659         { -64, IWL_RATE_MCS_8_INDEX },
2660         { -68, IWL_RATE_MCS_7_INDEX },
2661         { -72, IWL_RATE_MCS_6_INDEX },
2662         { -80, IWL_RATE_MCS_5_INDEX },
2663         { -84, IWL_RATE_MCS_4_INDEX },
2664         { -85, IWL_RATE_MCS_3_INDEX },
2665         { -87, IWL_RATE_MCS_2_INDEX },
2666         { -88, IWL_RATE_MCS_1_INDEX },
2667         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2668 };
2669
2670 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2671
2672 /* Init the optimal rate based on STA caps
2673  * This combined with rssi is used to report the last tx rate
2674  * to userspace when we haven't transmitted enough frames.
2675  */
2676 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2677                                  struct ieee80211_sta *sta,
2678                                  struct iwl_lq_sta *lq_sta)
2679 {
2680         struct rs_rate *rate = &lq_sta->optimal_rate;
2681
2682         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2683                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2684         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2685                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2686         else if (lq_sta->band == NL80211_BAND_5GHZ)
2687                 rate->type = LQ_LEGACY_A;
2688         else
2689                 rate->type = LQ_LEGACY_G;
2690
2691         rate->bw = rs_bw_from_sta_bw(sta);
2692         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2693
2694         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2695
2696         if (is_mimo(rate)) {
2697                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2698         } else if (is_siso(rate)) {
2699                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2700         } else {
2701                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2702
2703                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2704                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2705                         lq_sta->optimal_nentries =
2706                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2707                 } else {
2708                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2709                         lq_sta->optimal_nentries =
2710                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2711                 }
2712         }
2713
2714         if (is_vht(rate)) {
2715                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2716                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2717                         lq_sta->optimal_nentries =
2718                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2719                 } else {
2720                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2721                         lq_sta->optimal_nentries =
2722                                 ARRAY_SIZE(rs_optimal_rates_vht);
2723                 }
2724         } else if (is_ht(rate)) {
2725                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2726                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2727         }
2728 }
2729
2730 /* Compute the optimal rate index based on RSSI */
2731 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2732                                            struct iwl_lq_sta *lq_sta)
2733 {
2734         struct rs_rate *rate = &lq_sta->optimal_rate;
2735         int i;
2736
2737         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2738                                      BITS_PER_LONG);
2739
2740         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2741                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2742
2743                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2744                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2745                         rate->index = rate_idx;
2746                         break;
2747                 }
2748         }
2749
2750         return rate;
2751 }
2752
2753 /* Choose an initial legacy rate and antenna to use based on the RSSI
2754  * of last Rx
2755  */
2756 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2757                                 struct ieee80211_sta *sta,
2758                                 struct iwl_lq_sta *lq_sta,
2759                                 enum nl80211_band band,
2760                                 struct rs_rate *rate)
2761 {
2762         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2763         int i, nentries;
2764         unsigned long active_rate;
2765         s8 best_rssi = S8_MIN;
2766         u8 best_ant = ANT_NONE;
2767         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2768         const struct rs_init_rate_info *initial_rates;
2769
2770         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2771                 if (!(lq_sta->pers.chains & BIT(i)))
2772                         continue;
2773
2774                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2775                         best_rssi = lq_sta->pers.chain_signal[i];
2776                         best_ant = BIT(i);
2777                 }
2778         }
2779
2780         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2781                        rs_pretty_ant(best_ant), best_rssi);
2782
2783         if (best_ant != ANT_A && best_ant != ANT_B)
2784                 rate->ant = first_antenna(valid_tx_ant);
2785         else
2786                 rate->ant = best_ant;
2787
2788         rate->sgi = false;
2789         rate->ldpc = false;
2790         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2791
2792         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2793                                      BITS_PER_LONG);
2794
2795         if (band == NL80211_BAND_5GHZ) {
2796                 rate->type = LQ_LEGACY_A;
2797                 initial_rates = rs_optimal_rates_5ghz_legacy;
2798                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2799         } else {
2800                 rate->type = LQ_LEGACY_G;
2801                 initial_rates = rs_optimal_rates_24ghz_legacy;
2802                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2803         }
2804
2805         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2806                 goto out;
2807
2808         /* Start from a higher rate if the corresponding debug capability
2809          * is enabled. The rate is chosen according to AP capabilities.
2810          * In case of VHT/HT when the rssi is low fallback to the case of
2811          * legacy rates.
2812          */
2813         if (sta->vht_cap.vht_supported &&
2814             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2815                 /*
2816                  * In AP mode, when a new station associates, rs is initialized
2817                  * immediately upon association completion, before the phy
2818                  * context is updated with the association parameters, so the
2819                  * sta bandwidth might be wider than the phy context allows.
2820                  * To avoid this issue, always initialize rs with 20mhz
2821                  * bandwidth rate, and after authorization, when the phy context
2822                  * is already up-to-date, re-init rs with the correct bw.
2823                  */
2824                 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2825                                 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2826
2827                 switch (bw) {
2828                 case RATE_MCS_CHAN_WIDTH_40:
2829                 case RATE_MCS_CHAN_WIDTH_80:
2830                 case RATE_MCS_CHAN_WIDTH_160:
2831                         initial_rates = rs_optimal_rates_vht;
2832                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2833                         break;
2834                 case RATE_MCS_CHAN_WIDTH_20:
2835                         initial_rates = rs_optimal_rates_vht_20mhz;
2836                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2837                         break;
2838                 default:
2839                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2840                         goto out;
2841                 }
2842
2843                 active_rate = lq_sta->active_siso_rate;
2844                 rate->type = LQ_VHT_SISO;
2845                 rate->bw = bw;
2846         } else if (sta->ht_cap.ht_supported &&
2847                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2848                 initial_rates = rs_optimal_rates_ht;
2849                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2850                 active_rate = lq_sta->active_siso_rate;
2851                 rate->type = LQ_HT_SISO;
2852         } else {
2853                 active_rate = lq_sta->active_legacy_rate;
2854         }
2855
2856         for (i = 0; i < nentries; i++) {
2857                 int rate_idx = initial_rates[i].rate_idx;
2858
2859                 if ((best_rssi >= initial_rates[i].rssi) &&
2860                     (BIT(rate_idx) & active_rate)) {
2861                         rate->index = rate_idx;
2862                         break;
2863                 }
2864         }
2865
2866 out:
2867         rs_dump_rate(mvm, rate, "INITIAL");
2868 }
2869
2870 /* Save info about RSSI of last Rx */
2871 void rs_update_last_rssi(struct iwl_mvm *mvm,
2872                          struct iwl_mvm_sta *mvmsta,
2873                          struct ieee80211_rx_status *rx_status)
2874 {
2875         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2876         int i;
2877
2878         lq_sta->pers.chains = rx_status->chains;
2879         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2880         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2881         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2882         lq_sta->pers.last_rssi = S8_MIN;
2883
2884         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2885                 if (!(lq_sta->pers.chains & BIT(i)))
2886                         continue;
2887
2888                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2889                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2890         }
2891 }
2892
2893 /**
2894  * rs_initialize_lq - Initialize a station's hardware rate table
2895  *
2896  * The uCode's station table contains a table of fallback rates
2897  * for automatic fallback during transmission.
2898  *
2899  * NOTE: This sets up a default set of values.  These will be replaced later
2900  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2901  *       rc80211_simple.
2902  *
2903  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2904  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2905  *       which requires station table entry to exist).
2906  */
2907 static void rs_initialize_lq(struct iwl_mvm *mvm,
2908                              struct ieee80211_sta *sta,
2909                              struct iwl_lq_sta *lq_sta,
2910                              enum nl80211_band band, bool update)
2911 {
2912         struct iwl_scale_tbl_info *tbl;
2913         struct rs_rate *rate;
2914         u8 active_tbl = 0;
2915
2916         if (!sta || !lq_sta)
2917                 return;
2918
2919         if (!lq_sta->search_better_tbl)
2920                 active_tbl = lq_sta->active_tbl;
2921         else
2922                 active_tbl = 1 - lq_sta->active_tbl;
2923
2924         tbl = &(lq_sta->lq_info[active_tbl]);
2925         rate = &tbl->rate;
2926
2927         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2928         rs_init_optimal_rate(mvm, sta, lq_sta);
2929
2930         WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2931                   "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2932                   rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2933                   mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2934
2935         tbl->column = rs_get_column_from_rate(rate);
2936
2937         rs_set_expected_tpt_table(lq_sta, tbl);
2938         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2939         /* TODO restore station should remember the lq cmd */
2940         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, !update);
2941 }
2942
2943 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2944                             void *mvm_sta,
2945                             struct ieee80211_tx_rate_control *txrc)
2946 {
2947         struct iwl_op_mode *op_mode = mvm_r;
2948         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2949         struct sk_buff *skb = txrc->skb;
2950         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2951         struct iwl_lq_sta *lq_sta;
2952         struct rs_rate *optimal_rate;
2953         u32 last_ucode_rate;
2954
2955         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2956                 /* if vif isn't initialized mvm doesn't know about
2957                  * this station, so don't do anything with the it
2958                  */
2959                 sta = NULL;
2960                 mvm_sta = NULL;
2961         }
2962
2963         /* Send management frames and NO_ACK data using lowest rate. */
2964         if (rate_control_send_low(sta, mvm_sta, txrc))
2965                 return;
2966
2967         if (!mvm_sta)
2968                 return;
2969
2970         lq_sta = mvm_sta;
2971         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2972                                   info->band, &info->control.rates[0]);
2973         info->control.rates[0].count = 1;
2974
2975         /* Report the optimal rate based on rssi and STA caps if we haven't
2976          * converged yet (too little traffic) or exploring other modulations
2977          */
2978         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2979                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2980                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2981                                                           optimal_rate);
2982                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2983                                           &txrc->reported_rate);
2984         }
2985 }
2986
2987 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2988                               gfp_t gfp)
2989 {
2990         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2991         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2992         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2993         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2994
2995         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2996
2997         lq_sta->pers.drv = mvm;
2998 #ifdef CONFIG_MAC80211_DEBUGFS
2999         lq_sta->pers.dbg_fixed_rate = 0;
3000         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
3001         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3002 #endif
3003         lq_sta->pers.chains = 0;
3004         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
3005         lq_sta->pers.last_rssi = S8_MIN;
3006
3007         return lq_sta;
3008 }
3009
3010 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
3011                                        int nss)
3012 {
3013         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
3014                 (0x3 << (2 * (nss - 1)));
3015         rx_mcs >>= (2 * (nss - 1));
3016