]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - drivers/net/wireless/intel/iwlwifi/mvm/rs.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
iwlwifi: dvm: don't call << operator with a negative value
[mirror_ubuntu-artful-kernel.git] / drivers / net / wireless / intel / iwlwifi / mvm / rs.c
CommitLineData
8ca151b5
JB		 1/******************************************************************************
2 *
51368bf7 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
fcc5e851 4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
69c7fda4 5 * Copyright(c) 2016 Intel Deutschland GmbH
8ca151b5
JB		 6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
19 *
20 * The full GNU General Public License is included in this distribution in the
21 * file called LICENSE.
22 *
23 * Contact Information:
cb2f8277 24 * Intel Linux Wireless <linuxwifi@intel.com>
8ca151b5
JB		 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26 *
27 *****************************************************************************/
28#include <linux/kernel.h>
8ca151b5
JB		 29#include <linux/skbuff.h>
30#include <linux/slab.h>
31#include <net/mac80211.h>
32
33#include <linux/netdevice.h>
34#include <linux/etherdevice.h>
35#include <linux/delay.h>
36
37#include <linux/workqueue.h>
38#include "rs.h"
39#include "fw-api.h"
40#include "sta.h"
41#include "iwl-op-mode.h"
42#include "mvm.h"
1e9c62fa 43#include "debugfs.h"
8ca151b5
JB		 44
45#define RS_NAME "iwl-mvm-rs"
46
8ca151b5 47#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
8ca151b5 48
834437da
ES		 49/* Calculations of success ratio are done in fixed point where 12800 is 100%.
50 * Use this macro when dealing with thresholds consts set as a percentage
51 */
52#define RS_PERCENT(x) (128 * x)
8ca151b5
JB		 53
54static u8 rs_ht_to_legacy[] = {
da87d7d5
ES		 55 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
56 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
57 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
58 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
59 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
60 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
61 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
62 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
64 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
8ca151b5
JB		 65};
66
67static const u8 ant_toggle_lookup[] = {
ef4394b9
EP		 68 [ANT_NONE] = ANT_NONE,
69 [ANT_A] = ANT_B,
70 [ANT_B] = ANT_C,
71 [ANT_AB] = ANT_BC,
72 [ANT_C] = ANT_A,
73 [ANT_AC] = ANT_AB,
74 [ANT_BC] = ANT_AC,
75 [ANT_ABC] = ANT_ABC,
8ca151b5
JB		 76};
77
d310e405
ES		 78#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_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_##rp##M_INDEX, \
ab055ce9 85 IWL_RATE_##rn##M_INDEX }
8ca151b5 86
d310e405
ES		 87#define IWL_DECLARE_MCS_RATE(s) \
88 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
89 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
90 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
92 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
93 IWL_RATE_INVM_INDEX, \
94 IWL_RATE_INVM_INDEX }
95
8ca151b5
JB		 96/*
97 * Parameter order:
ab055ce9 98 * rate, ht rate, prev rate, next rate
8ca151b5
JB		 99 *
100 * If there isn't a valid next or previous rate then INV is used which
101 * maps to IWL_RATE_INVALID
102 *
103 */
104static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
ab055ce9
ES		 105 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
106 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
107 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
108 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
d310e405
ES		 109 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
110 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
111 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
112 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
113 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
114 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
115 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
116 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
117 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
118 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
119 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
8ca151b5
JB		 120};
121
4e4b815c
ES		 122enum rs_action {
123 RS_ACTION_STAY = 0,
124 RS_ACTION_DOWNSCALE = -1,
125 RS_ACTION_UPSCALE = 1,
126};
127
b3b06a32
ES		 128enum rs_column_mode {
129 RS_INVALID = 0,
130 RS_LEGACY,
131 RS_SISO,
132 RS_MIMO2,
133};
134
fd7dbee5 135#define MAX_NEXT_COLUMNS 7
b3b06a32
ES		 136#define MAX_COLUMN_CHECKS 3
137
0b8d17f3
ES		 138struct rs_tx_column;
139
b3b06a32
ES		 140typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
141 struct ieee80211_sta *sta,
bb8f44c9 142 struct rs_rate *rate,
0b8d17f3 143 const struct rs_tx_column *next_col);
b3b06a32
ES		 144
145struct rs_tx_column {
146 enum rs_column_mode mode;
147 u8 ant;
148 bool sgi;
149 enum rs_column next_columns[MAX_NEXT_COLUMNS];
150 allow_column_func_t checks[MAX_COLUMN_CHECKS];
151};
152
219fb66b 153static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
bb8f44c9 154 struct rs_rate *rate,
0b8d17f3 155 const struct rs_tx_column *next_col)
219fb66b 156{
0b8d17f3 157 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
219fb66b
EG		 158}
159
b3b06a32 160static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
bb8f44c9 161 struct rs_rate *rate,
0b8d17f3 162 const struct rs_tx_column *next_col)
b3b06a32
ES		 163{
164 if (!sta->ht_cap.ht_supported)
165 return false;
166
167 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
168 return false;
169
a0544272 170 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
b3b06a32
ES		 171 return false;
172
173 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
174 return false;
175
5f0d98f2
EG		 176 if (mvm->nvm_data->sku_cap_mimo_disabled)
177 return false;
178
b3b06a32
ES		 179 return true;
180}
181
182static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
bb8f44c9 183 struct rs_rate *rate,
0b8d17f3 184 const struct rs_tx_column *next_col)
b3b06a32
ES		 185{
186 if (!sta->ht_cap.ht_supported)
187 return false;
188
189 return true;
190}
191
192static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
bb8f44c9 193 struct rs_rate *rate,
0b8d17f3 194 const struct rs_tx_column *next_col)
b3b06a32 195{
b3b06a32
ES		 196 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
197 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
198
199 if (is_ht20(rate) && (ht_cap->cap &
200 IEEE80211_HT_CAP_SGI_20))
201 return true;
202 if (is_ht40(rate) && (ht_cap->cap &
203 IEEE80211_HT_CAP_SGI_40))
204 return true;
205 if (is_ht80(rate) && (vht_cap->cap &
206 IEEE80211_VHT_CAP_SHORT_GI_80))
207 return true;
855f492f
GG		 208 if (is_ht160(rate) && (vht_cap->cap &
209 IEEE80211_VHT_CAP_SHORT_GI_160))
210 return true;
b3b06a32
ES		 211
212 return false;
213}
214
215static const struct rs_tx_column rs_tx_columns[] = {
216 [RS_COLUMN_LEGACY_ANT_A] = {
217 .mode = RS_LEGACY,
218 .ant = ANT_A,
219 .next_columns = {
220 RS_COLUMN_LEGACY_ANT_B,
221 RS_COLUMN_SISO_ANT_A,
31b20452 222 RS_COLUMN_MIMO2,
d8fff919
ES		 223 RS_COLUMN_INVALID,
224 RS_COLUMN_INVALID,
fd7dbee5
ES		 225 RS_COLUMN_INVALID,
226 RS_COLUMN_INVALID,
b3b06a32 227 },
219fb66b
EG		 228 .checks = {
229 rs_ant_allow,
230 },
b3b06a32
ES		 231 },
232 [RS_COLUMN_LEGACY_ANT_B] = {
233 .mode = RS_LEGACY,
234 .ant = ANT_B,
235 .next_columns = {
236 RS_COLUMN_LEGACY_ANT_A,
237 RS_COLUMN_SISO_ANT_B,
31b20452 238 RS_COLUMN_MIMO2,
d8fff919
ES		 239 RS_COLUMN_INVALID,
240 RS_COLUMN_INVALID,
fd7dbee5
ES		 241 RS_COLUMN_INVALID,
242 RS_COLUMN_INVALID,
b3b06a32 243 },
219fb66b
EG		 244 .checks = {
245 rs_ant_allow,
246 },
b3b06a32
ES		 247 },
248 [RS_COLUMN_SISO_ANT_A] = {
249 .mode = RS_SISO,
250 .ant = ANT_A,
251 .next_columns = {
252 RS_COLUMN_SISO_ANT_B,
253 RS_COLUMN_MIMO2,
254 RS_COLUMN_SISO_ANT_A_SGI,
fd7dbee5
ES		 255 RS_COLUMN_LEGACY_ANT_A,
256 RS_COLUMN_LEGACY_ANT_B,
d8fff919 257 RS_COLUMN_INVALID,
31b20452 258 RS_COLUMN_INVALID,
b3b06a32
ES		 259 },
260 .checks = {
261 rs_siso_allow,
219fb66b 262 rs_ant_allow,
b3b06a32
ES		 263 },
264 },
265 [RS_COLUMN_SISO_ANT_B] = {
266 .mode = RS_SISO,
267 .ant = ANT_B,
268 .next_columns = {
269 RS_COLUMN_SISO_ANT_A,
270 RS_COLUMN_MIMO2,
271 RS_COLUMN_SISO_ANT_B_SGI,
fd7dbee5
ES		 272 RS_COLUMN_LEGACY_ANT_A,
273 RS_COLUMN_LEGACY_ANT_B,
d8fff919 274 RS_COLUMN_INVALID,
31b20452 275 RS_COLUMN_INVALID,
b3b06a32
ES		 276 },
277 .checks = {
278 rs_siso_allow,
219fb66b 279 rs_ant_allow,
b3b06a32
ES		 280 },
281 },
282 [RS_COLUMN_SISO_ANT_A_SGI] = {
283 .mode = RS_SISO,
284 .ant = ANT_A,
285 .sgi = true,
286 .next_columns = {
287 RS_COLUMN_SISO_ANT_B_SGI,
288 RS_COLUMN_MIMO2_SGI,
289 RS_COLUMN_SISO_ANT_A,
fd7dbee5
ES		 290 RS_COLUMN_LEGACY_ANT_A,
291 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 292 RS_COLUMN_INVALID,
293 RS_COLUMN_INVALID,
b3b06a32
ES		 294 },
295 .checks = {
296 rs_siso_allow,
219fb66b 297 rs_ant_allow,
b3b06a32
ES		 298 rs_sgi_allow,
299 },
300 },
301 [RS_COLUMN_SISO_ANT_B_SGI] = {
302 .mode = RS_SISO,
303 .ant = ANT_B,
304 .sgi = true,
305 .next_columns = {
306 RS_COLUMN_SISO_ANT_A_SGI,
307 RS_COLUMN_MIMO2_SGI,
308 RS_COLUMN_SISO_ANT_B,
fd7dbee5
ES		 309 RS_COLUMN_LEGACY_ANT_A,
310 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 311 RS_COLUMN_INVALID,
312 RS_COLUMN_INVALID,
b3b06a32
ES		 313 },
314 .checks = {
315 rs_siso_allow,
219fb66b 316 rs_ant_allow,
b3b06a32
ES		 317 rs_sgi_allow,
318 },
319 },
320 [RS_COLUMN_MIMO2] = {
321 .mode = RS_MIMO2,
322 .ant = ANT_AB,
323 .next_columns = {
324 RS_COLUMN_SISO_ANT_A,
325 RS_COLUMN_MIMO2_SGI,
fd7dbee5
ES		 326 RS_COLUMN_LEGACY_ANT_A,
327 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 328 RS_COLUMN_INVALID,
329 RS_COLUMN_INVALID,
330 RS_COLUMN_INVALID,
b3b06a32
ES		 331 },
332 .checks = {
333 rs_mimo_allow,
334 },
335 },
336 [RS_COLUMN_MIMO2_SGI] = {
337 .mode = RS_MIMO2,
338 .ant = ANT_AB,
339 .sgi = true,
340 .next_columns = {
341 RS_COLUMN_SISO_ANT_A_SGI,
342 RS_COLUMN_MIMO2,
fd7dbee5
ES		 343 RS_COLUMN_LEGACY_ANT_A,
344 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 345 RS_COLUMN_INVALID,
346 RS_COLUMN_INVALID,
347 RS_COLUMN_INVALID,
b3b06a32
ES		 348 },
349 .checks = {
350 rs_mimo_allow,
351 rs_sgi_allow,
352 },
353 },
354};
355
8ca151b5
JB		 356static inline u8 rs_extract_rate(u32 rate_n_flags)
357{
358 /* also works for HT because bits 7:6 are zero there */
359 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
360}
361
362static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
363{
364 int idx = 0;
365
8ca151b5 366 if (rate_n_flags & RATE_MCS_HT_MSK) {
d310e405
ES		 367 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
368 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 369
d310e405 370 /* skip 9M not supported in HT*/
8ca151b5
JB		 371 if (idx >= IWL_RATE_9M_INDEX)
372 idx += 1;
4e82dd3a 373 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
8ca151b5 374 return idx;
d310e405
ES		 375 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
376 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
377 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 378
d310e405
ES		 379 /* skip 9M not supported in VHT*/
380 if (idx >= IWL_RATE_9M_INDEX)
381 idx++;
382 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
383 return idx;
8ca151b5 384 } else {
d310e405
ES		 385 /* legacy rate format, search for match in table */
386
387 u8 legacy_rate = rs_extract_rate(rate_n_flags);
8ca151b5 388 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
d310e405 389 if (iwl_rates[idx].plcp == legacy_rate)
8ca151b5
JB		 390 return idx;
391 }
392
560843f4 393 return IWL_RATE_INVALID;
8ca151b5
JB		 394}
395
396static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1ebc8f2e
ES		 397 struct ieee80211_sta *sta,
398 struct iwl_lq_sta *lq_sta,
ff7a68d0 399 int tid, bool ndp);
8fc7c58c
ES		 400static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
401 struct ieee80211_sta *sta,
402 struct iwl_lq_sta *lq_sta,
403 const struct rs_rate *initial_rate);
8ca151b5 404static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
8ca151b5 405
8ca151b5
JB		 406/**
407 * The following tables contain the expected throughput metrics for all rates
408 *
409 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
410 *
411 * where invalid entries are zeros.
412 *
413 * CCK rates are only valid in legacy table and will only be used in G
414 * (2.4 GHz) band.
415 */
416
a34529e8 417static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
4e82dd3a 418 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
8ca151b5
JB		 419};
420
4e82dd3a
ES		 421/* Expected TpT tables. 4 indexes:
422 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
423 */
a34529e8 424static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 425 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
426 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
427 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
428 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
8ca151b5
JB		 429};
430
a34529e8 431static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 432 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
433 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
434 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
435 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
8ca151b5
JB		 436};
437
a34529e8 438static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 439 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
440 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
441 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
442 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
443};
444
855f492f
GG		 445static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
446 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
447 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
448 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
449 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
450};
451
a34529e8 452static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 453 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
454 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
455 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
456 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
8ca151b5
JB		 457};
458
a34529e8 459static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 460 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
461 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
462 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
463 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
8ca151b5
JB		 464};
465
a34529e8 466static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 467 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
468 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
469 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
470 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
471};
472
855f492f
GG		 473static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
474 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
475 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
476 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
477 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
478};
479
8ca151b5
JB		 480/* mbps, mcs */
481static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
482 { "1", "BPSK DSSS"},
483 { "2", "QPSK DSSS"},
484 {"5.5", "BPSK CCK"},
485 { "11", "QPSK CCK"},
486 { "6", "BPSK 1/2"},
487 { "9", "BPSK 1/2"},
488 { "12", "QPSK 1/2"},
489 { "18", "QPSK 3/4"},
490 { "24", "16QAM 1/2"},
491 { "36", "16QAM 3/4"},
492 { "48", "64QAM 2/3"},
493 { "54", "64QAM 3/4"},
494 { "60", "64QAM 5/6"},
495};
496
497#define MCS_INDEX_PER_STREAM (8)
498
9d10849e
EG		 499static const char *rs_pretty_ant(u8 ant)
500{
501 static const char * const ant_name[] = {
502 [ANT_NONE] = "None",
503 [ANT_A] = "A",
504 [ANT_B] = "B",
505 [ANT_AB] = "AB",
506 [ANT_C] = "C",
507 [ANT_AC] = "AC",
508 [ANT_BC] = "BC",
509 [ANT_ABC] = "ABC",
510 };
511
512 if (ant > ANT_ABC)
513 return "UNKNOWN";
514
515 return ant_name[ant];
516}
517
518static const char *rs_pretty_lq_type(enum iwl_table_type type)
519{
520 static const char * const lq_types[] = {
521 [LQ_NONE] = "NONE",
522 [LQ_LEGACY_A] = "LEGACY_A",
523 [LQ_LEGACY_G] = "LEGACY_G",
524 [LQ_HT_SISO] = "HT SISO",
525 [LQ_HT_MIMO2] = "HT MIMO",
526 [LQ_VHT_SISO] = "VHT SISO",
527 [LQ_VHT_MIMO2] = "VHT MIMO",
528 };
529
530 if (type < LQ_NONE || type >= LQ_MAX)
531 return "UNKNOWN";
532
533 return lq_types[type];
534}
535
cc60c6e9
ES		 536static char *rs_pretty_rate(const struct rs_rate *rate)
537{
538 static char buf[40];
539 static const char * const legacy_rates[] = {
540 [IWL_RATE_1M_INDEX] = "1M",
541 [IWL_RATE_2M_INDEX] = "2M",
542 [IWL_RATE_5M_INDEX] = "5.5M",
543 [IWL_RATE_11M_INDEX] = "11M",
544 [IWL_RATE_6M_INDEX] = "6M",
545 [IWL_RATE_9M_INDEX] = "9M",
546 [IWL_RATE_12M_INDEX] = "12M",
547 [IWL_RATE_18M_INDEX] = "18M",
548 [IWL_RATE_24M_INDEX] = "24M",
549 [IWL_RATE_36M_INDEX] = "36M",
550 [IWL_RATE_48M_INDEX] = "48M",
551 [IWL_RATE_54M_INDEX] = "54M",
552 };
553 static const char *const ht_vht_rates[] = {
554 [IWL_RATE_MCS_0_INDEX] = "MCS0",
555 [IWL_RATE_MCS_1_INDEX] = "MCS1",
556 [IWL_RATE_MCS_2_INDEX] = "MCS2",
557 [IWL_RATE_MCS_3_INDEX] = "MCS3",
558 [IWL_RATE_MCS_4_INDEX] = "MCS4",
559 [IWL_RATE_MCS_5_INDEX] = "MCS5",
560 [IWL_RATE_MCS_6_INDEX] = "MCS6",
561 [IWL_RATE_MCS_7_INDEX] = "MCS7",
562 [IWL_RATE_MCS_8_INDEX] = "MCS8",
563 [IWL_RATE_MCS_9_INDEX] = "MCS9",
564 };
565 const char *rate_str;
566
e8b3f7b6 567 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
cc60c6e9 568 rate_str = legacy_rates[rate->index];
e8b3f7b6 569 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
4494541c 570 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
e8b3f7b6 571 (rate->index <= IWL_RATE_MCS_9_INDEX))
cc60c6e9
ES		 572 rate_str = ht_vht_rates[rate->index];
573 else
574 rate_str = "BAD_RATE";
575
576 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
577 rs_pretty_ant(rate->ant), rate_str);
578 return buf;
579}
580
5aa33553
ES		 581static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
582 const char *prefix)
583{
d8bafeaf 584 IWL_DEBUG_RATE(mvm,
cc60c6e9
ES		 585 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
586 prefix, rs_pretty_rate(rate), rate->bw,
587 rate->sgi, rate->ldpc, rate->stbc);
5aa33553
ES		 588}
589
8ca151b5
JB		 590static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
591{
592 window->data = 0;
593 window->success_counter = 0;
594 window->success_ratio = IWL_INVALID_VALUE;
595 window->counter = 0;
596 window->average_tpt = IWL_INVALID_VALUE;
8ca151b5
JB		 597}
598
b804eeb6
ES		 599static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
600 struct iwl_scale_tbl_info *tbl)
3ca71f60
EP		 601{
602 int i;
603
b804eeb6 604 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
3ca71f60
EP		 605 for (i = 0; i < IWL_RATE_COUNT; i++)
606 rs_rate_scale_clear_window(&tbl->win[i]);
2fd647f8
EP		 607
608 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
609 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
3ca71f60
EP		 610}
611
8ca151b5
JB		 612static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
613{
614 return (ant_type & valid_antenna) == ant_type;
615}
616
8ca151b5 617static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
40ce5ed1
ES		 618 struct iwl_lq_sta *lq_data, u8 tid,
619 struct ieee80211_sta *sta)
8ca151b5
JB		 620{
621 int ret = -EAGAIN;
8ca151b5 622
44cc429c
EG		 623 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
624 sta->addr, tid);
625 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
626 if (ret == -EAGAIN) {
627 /*
628 * driver and mac80211 is out of sync
629 * this might be cause by reloading firmware
630 * stop the tx ba session here
631 */
632 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
633 tid);
634 ieee80211_stop_tx_ba_session(sta, tid);
8ca151b5
JB		 635 }
636 return ret;
637}
638
639static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
640 struct iwl_lq_sta *lq_data,
641 struct ieee80211_sta *sta)
642{
643 if (tid < IWL_MAX_TID_COUNT)
644 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
645 else
646 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
647 tid, IWL_MAX_TID_COUNT);
648}
649
650static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
651{
652 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
653 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
654 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
655}
656
657/*
658 * Static function to get the expected throughput from an iwl_scale_tbl_info
659 * that wraps a NULL pointer check
660 */
661static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
662{
663 if (tbl->expected_tpt)
664 return tbl->expected_tpt[rs_index];
665 return 0;
666}
667
668/**
669 * rs_collect_tx_data - Update the success/failure sliding window
670 *
671 * We keep a sliding window of the last 62 packets transmitted
672 * at this rate. window->data contains the bitmask of successful
673 * packets.
674 */
834437da
ES		 675static int _rs_collect_tx_data(struct iwl_mvm *mvm,
676 struct iwl_scale_tbl_info *tbl,
0bd3c5a7
EP		 677 int scale_index, int attempts, int successes,
678 struct iwl_rate_scale_data *window)
8ca151b5 679{
8ca151b5
JB		 680 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
681 s32 fail_count, tpt;
682
8ca151b5
JB		 683 /* Get expected throughput */
684 tpt = get_expected_tpt(tbl, scale_index);
685
686 /*
687 * Keep track of only the latest 62 tx frame attempts in this rate's
688 * history window; anything older isn't really relevant any more.
689 * If we have filled up the sliding window, drop the oldest attempt;
690 * if the oldest attempt (highest bit in bitmap) shows "success",
691 * subtract "1" from the success counter (this is the main reason
692 * we keep these bitmaps!).
693 */
694 while (attempts > 0) {
695 if (window->counter >= IWL_RATE_MAX_WINDOW) {
696 /* remove earliest */
697 window->counter = IWL_RATE_MAX_WINDOW - 1;
698
699 if (window->data & mask) {
700 window->data &= ~mask;
701 window->success_counter--;
702 }
703 }
704
705 /* Increment frames-attempted counter */
706 window->counter++;
707
708 /* Shift bitmap by one frame to throw away oldest history */
709 window->data <<= 1;
710
711 /* Mark the most recent #successes attempts as successful */
712 if (successes > 0) {
713 window->success_counter++;
714 window->data |= 0x1;
715 successes--;
716 }
717
718 attempts--;
719 }
720
721 /* Calculate current success ratio, avoid divide-by-0! */
722 if (window->counter > 0)
723 window->success_ratio = 128 * (100 * window->success_counter)
724 / window->counter;
725 else
726 window->success_ratio = IWL_INVALID_VALUE;
727
728 fail_count = window->counter - window->success_counter;
729
730 /* Calculate average throughput, if we have enough history. */
834437da
ES		 731 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
732 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
8ca151b5
JB		 733 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
734 else
735 window->average_tpt = IWL_INVALID_VALUE;
736
8ca151b5
JB		 737 return 0;
738}
739
69c7fda4
GG		 740static int rs_collect_tpc_data(struct iwl_mvm *mvm,
741 struct iwl_lq_sta *lq_sta,
742 struct iwl_scale_tbl_info *tbl,
743 int scale_index, int attempts, int successes,
744 u8 reduced_txp)
745{
746 struct iwl_rate_scale_data *window = NULL;
747
748 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
749 return -EINVAL;
750
751 window = &tbl->tpc_win[reduced_txp];
752 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
753 window);
754}
755
756static int rs_collect_tlc_data(struct iwl_mvm *mvm,
757 struct iwl_lq_sta *lq_sta,
758 struct iwl_scale_tbl_info *tbl,
759 int scale_index, int attempts, int successes)
0bd3c5a7
EP		 760{
761 struct iwl_rate_scale_data *window = NULL;
762
763 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
764 return -EINVAL;
765
757cf23b 766 if (tbl->column != RS_COLUMN_INVALID) {
f58220f6
ES		 767 struct lq_sta_pers *pers = &lq_sta->pers;
768
769 pers->tx_stats[tbl->column][scale_index].total += attempts;
770 pers->tx_stats[tbl->column][scale_index].success += successes;
757cf23b
ES		 771 }
772
0bd3c5a7
EP		 773 /* Select window for current tx bit rate */
774 window = &(tbl->win[scale_index]);
834437da 775 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
0bd3c5a7
EP		 776 window);
777}
778
5aa33553
ES		 779/* Convert rs_rate object into ucode rate bitmask */
780static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
8fc7c58c 781 struct rs_rate *rate)
8ca151b5 782{
5aa33553
ES		 783 u32 ucode_rate = 0;
784 int index = rate->index;
8ca151b5 785
5aa33553 786 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
d310e405
ES		 787 RATE_MCS_ANT_ABC_MSK);
788
5aa33553
ES		 789 if (is_legacy(rate)) {
790 ucode_rate |= iwl_rates[index].plcp;
8ca151b5 791 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
5aa33553
ES		 792 ucode_rate |= RATE_MCS_CCK_MSK;
793 return ucode_rate;
d310e405
ES		 794 }
795
5aa33553 796 if (is_ht(rate)) {
d310e405 797 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
8ca151b5 798 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
4e82dd3a 799 index = IWL_LAST_HT_RATE;
8ca151b5 800 }
5aa33553 801 ucode_rate |= RATE_MCS_HT_MSK;
8ca151b5 802
5aa33553
ES		 803 if (is_ht_siso(rate))
804 ucode_rate |= iwl_rates[index].plcp_ht_siso;
805 else if (is_ht_mimo2(rate))
806 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
8ca151b5 807 else
d972ab31 808 WARN_ON_ONCE(1);
5aa33553 809 } else if (is_vht(rate)) {
d310e405
ES		 810 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
811 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
812 index = IWL_LAST_VHT_RATE;
813 }
5aa33553
ES		 814 ucode_rate |= RATE_MCS_VHT_MSK;
815 if (is_vht_siso(rate))
816 ucode_rate |= iwl_rates[index].plcp_vht_siso;
817 else if (is_vht_mimo2(rate))
818 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
d310e405
ES		 819 else
820 WARN_ON_ONCE(1);
821
8ca151b5 822 } else {
5aa33553 823 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
8ca151b5
JB		 824 }
825
d8bafeaf
ES		 826 if (is_siso(rate) && rate->stbc) {
827 /* To enable STBC we need to set both a flag and ANT_AB */
828 ucode_rate |= RATE_MCS_ANT_AB_MSK;
829 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
830 }
831
5aa33553
ES		 832 ucode_rate |= rate->bw;
833 if (rate->sgi)
834 ucode_rate |= RATE_MCS_SGI_MSK;
a3576ff2
ES		 835 if (rate->ldpc)
836 ucode_rate |= RATE_MCS_LDPC_MSK;
d310e405 837
5aa33553 838 return ucode_rate;
8ca151b5
JB		 839}
840
5aa33553
ES		 841/* Convert a ucode rate into an rs_rate object */
842static int rs_rate_from_ucode_rate(const u32 ucode_rate,
57fbcce3 843 enum nl80211_band band,
5aa33553 844 struct rs_rate *rate)
8ca151b5 845{
5aa33553
ES		 846 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
847 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
d310e405 848 u8 nss;
8ca151b5 849
9e898f1b 850 memset(rate, 0, sizeof(*rate));
5aa33553 851 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
8ca151b5 852
560843f4 853 if (rate->index == IWL_RATE_INVALID)
8ca151b5 854 return -EINVAL;
5aa33553
ES		 855
856 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
8ca151b5 857
d310e405 858 /* Legacy */
5aa33553
ES		 859 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
860 !(ucode_rate & RATE_MCS_VHT_MSK)) {
8ca151b5 861 if (num_of_ant == 1) {
57fbcce3 862 if (band == NL80211_BAND_5GHZ)
5aa33553 863 rate->type = LQ_LEGACY_A;
8ca151b5 864 else
5aa33553 865 rate->type = LQ_LEGACY_G;
8ca151b5 866 }
d310e405
ES		 867
868 return 0;
869 }
870
871 /* HT or VHT */
5aa33553
ES		 872 if (ucode_rate & RATE_MCS_SGI_MSK)
873 rate->sgi = true;
a3576ff2
ES		 874 if (ucode_rate & RATE_MCS_LDPC_MSK)
875 rate->ldpc = true;
d8bafeaf
ES		 876 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
877 rate->stbc = true;
ba69d0e3
ES		 878 if (ucode_rate & RATE_MCS_BF_MSK)
879 rate->bfer = true;
d310e405 880
5aa33553 881 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
d310e405 882
5aa33553
ES		 883 if (ucode_rate & RATE_MCS_HT_MSK) {
884 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
d310e405
ES		 885 RATE_HT_MCS_NSS_POS) + 1;
886
887 if (nss == 1) {
5aa33553 888 rate->type = LQ_HT_SISO;
ba69d0e3
ES		 889 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
890 "stbc %d bfer %d",
891 rate->stbc, rate->bfer);
d310e405 892 } else if (nss == 2) {
5aa33553 893 rate->type = LQ_HT_MIMO2;
d310e405 894 WARN_ON_ONCE(num_of_ant != 2);
8ca151b5 895 } else {
d310e405
ES		 896 WARN_ON_ONCE(1);
897 }
5aa33553
ES		 898 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
899 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
d310e405
ES		 900 RATE_VHT_MCS_NSS_POS) + 1;
901
902 if (nss == 1) {
5aa33553 903 rate->type = LQ_VHT_SISO;
ba69d0e3
ES		 904 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
905 "stbc %d bfer %d",
906 rate->stbc, rate->bfer);
d310e405 907 } else if (nss == 2) {
5aa33553 908 rate->type = LQ_VHT_MIMO2;
d310e405
ES		 909 WARN_ON_ONCE(num_of_ant != 2);
910 } else {
911 WARN_ON_ONCE(1);
8ca151b5
JB		 912 }
913 }
d310e405 914
5aa33553
ES		 915 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
916 !is_vht(rate));
d310e405 917
8ca151b5
JB		 918 return 0;
919}
920
921/* switch to another antenna/antennas and return 1 */
922/* if no other valid antenna found, return 0 */
8fc7c58c 923static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
8ca151b5
JB		 924{
925 u8 new_ant_type;
926
5aa33553 927 if (!rate->ant || rate->ant > ANT_ABC)
8ca151b5
JB		 928 return 0;
929
5aa33553 930 if (!rs_is_valid_ant(valid_ant, rate->ant))
8ca151b5
JB		 931 return 0;
932
5aa33553 933 new_ant_type = ant_toggle_lookup[rate->ant];
8ca151b5 934
5aa33553 935 while ((new_ant_type != rate->ant) &&
8ca151b5
JB		 936 !rs_is_valid_ant(valid_ant, new_ant_type))
937 new_ant_type = ant_toggle_lookup[new_ant_type];
938
5aa33553 939 if (new_ant_type == rate->ant)
8ca151b5
JB		 940 return 0;
941
5aa33553
ES		 942 rate->ant = new_ant_type;
943
8ca151b5
JB		 944 return 1;
945}
946
8ca151b5 947static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
5aa33553 948 struct rs_rate *rate)
8ca151b5 949{
5aa33553 950 if (is_legacy(rate))
8ca151b5 951 return lq_sta->active_legacy_rate;
5aa33553 952 else if (is_siso(rate))
d310e405 953 return lq_sta->active_siso_rate;
5aa33553 954 else if (is_mimo2(rate))
d310e405
ES		 955 return lq_sta->active_mimo2_rate;
956
957 WARN_ON_ONCE(1);
958 return 0;
8ca151b5
JB		 959}
960
961static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
962 int rate_type)
963{
964 u8 high = IWL_RATE_INVALID;
965 u8 low = IWL_RATE_INVALID;
966
967 /* 802.11A or ht walks to the next literal adjacent rate in
968 * the rate table */
5aa33553 969 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
8ca151b5
JB		 970 int i;
971 u32 mask;
972
973 /* Find the previous rate that is in the rate mask */
974 i = index - 1;
975 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
976 if (rate_mask & mask) {
977 low = i;
978 break;
979 }
980 }
981
982 /* Find the next rate that is in the rate mask */
983 i = index + 1;
984 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
985 if (rate_mask & mask) {
986 high = i;
987 break;
988 }
989 }
990
991 return (high << 8) | low;
992 }
993
994 low = index;
995 while (low != IWL_RATE_INVALID) {
996 low = iwl_rates[low].prev_rs;
997 if (low == IWL_RATE_INVALID)
998 break;
999 if (rate_mask & (1 << low))
1000 break;
8ca151b5
JB		 1001 }
1002
1003 high = index;
1004 while (high != IWL_RATE_INVALID) {
1005 high = iwl_rates[high].next_rs;
1006 if (high == IWL_RATE_INVALID)
1007 break;
1008 if (rate_mask & (1 << high))
1009 break;
8ca151b5
JB		 1010 }
1011
1012 return (high << 8) | low;
1013}
1014
e07be6d3
ES		 1015static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1016 struct rs_rate *rate)
8ca151b5 1017{
e07be6d3
ES		 1018 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1019}
1020
1021/* Get the next supported lower rate in the current column.
1022 * Return true if bottom rate in the current column was reached
1023 */
1024static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1025 struct rs_rate *rate)
1026{
1027 u8 low;
8ca151b5 1028 u16 high_low;
e07be6d3 1029 u16 rate_mask;
ae969afe 1030 struct iwl_mvm *mvm = lq_sta->pers.drv;
e07be6d3
ES		 1031
1032 rate_mask = rs_get_supported_rates(lq_sta, rate);
1033 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1034 rate->type);
1035 low = high_low & 0xff;
1036
1037 /* Bottom rate of column reached */
1038 if (low == IWL_RATE_INVALID)
1039 return true;
1040
1041 rate->index = low;
1042 return false;
1043}
1044
1045/* Get the next rate to use following a column downgrade */
1046static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1047 struct rs_rate *rate)
1048{
ae969afe 1049 struct iwl_mvm *mvm = lq_sta->pers.drv;
8ca151b5 1050
e07be6d3
ES		 1051 if (is_legacy(rate)) {
1052 /* No column to downgrade from Legacy */
1053 return;
1054 } else if (is_siso(rate)) {
1055 /* Downgrade to Legacy if we were in SISO */
57fbcce3 1056 if (lq_sta->band == NL80211_BAND_5GHZ)
5aa33553 1057 rate->type = LQ_LEGACY_A;
8ca151b5 1058 else
5aa33553 1059 rate->type = LQ_LEGACY_G;
8ca151b5 1060
a56db7d1 1061 rate->bw = RATE_MCS_CHAN_WIDTH_20;
8ca151b5 1062
b800040d 1063 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
e07be6d3 1064 rate->index > IWL_RATE_MCS_9_INDEX);
8ca151b5 1065
e07be6d3 1066 rate->index = rs_ht_to_legacy[rate->index];
a3576ff2 1067 rate->ldpc = false;
e07be6d3
ES		 1068 } else {
1069 /* Downgrade to SISO with same MCS if in MIMO */
1070 rate->type = is_vht_mimo2(rate) ?
1071 LQ_VHT_SISO : LQ_HT_SISO;
8ca151b5
JB		 1072 }
1073
e07be6d3 1074 if (num_of_ant(rate->ant) > 1)
a0544272 1075 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
8ca151b5 1076
e07be6d3
ES		 1077 /* Relevant in both switching to SISO or Legacy */
1078 rate->sgi = false;
1079
1080 if (!rs_rate_supported(lq_sta, rate))
1081 rs_get_lower_rate_in_column(lq_sta, rate);
8ca151b5
JB		 1082}
1083
ba69d0e3
ES		 1084/* Check if both rates are identical
1085 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1086 * with a rate indicating STBC/BFER and ANT_AB.
1087 */
929e6ede 1088static inline bool rs_rate_equal(struct rs_rate *a,
ba69d0e3
ES		 1089 struct rs_rate *b,
1090 bool allow_ant_mismatch)
1091
929e6ede 1092{
ba69d0e3
ES		 1093 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1094 (a->bfer == b->bfer);
1095
1096 if (allow_ant_mismatch) {
1097 if (a->stbc || a->bfer) {
1098 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1099 a->stbc, a->bfer, a->ant);
1100 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1101 } else if (b->stbc || b->bfer) {
1102 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1103 b->stbc, b->bfer, b->ant);
1104 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1105 }
1106 }
1107
929e6ede 1108 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
ba69d0e3 1109 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
929e6ede
ES		 1110}
1111
1112/* Check if both rates share the same column */
1113static inline bool rs_rate_column_match(struct rs_rate *a,
1114 struct rs_rate *b)
8ca151b5 1115{
d8bafeaf
ES		 1116 bool ant_match;
1117
ba69d0e3 1118 if (a->stbc || a->bfer)
d8bafeaf
ES		 1119 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1120 else
1121 ant_match = (a->ant == b->ant);
1122
1123 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1124 && ant_match;
8ca151b5
JB		 1125}
1126
ad82d8a5
ES		 1127static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1128{
1129 if (is_legacy(rate)) {
1130 if (rate->ant == ANT_A)
1131 return RS_COLUMN_LEGACY_ANT_A;
1132
1133 if (rate->ant == ANT_B)
1134 return RS_COLUMN_LEGACY_ANT_B;
1135
1136 goto err;
1137 }
1138
1139 if (is_siso(rate)) {
1140 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1141 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1142 RS_COLUMN_SISO_ANT_A;
1143
1144 if (rate->ant == ANT_B)
1145 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1146 RS_COLUMN_SISO_ANT_B;
1147
1148 goto err;
1149 }
1150
1151 if (is_mimo(rate))
1152 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1153
1154err:
1155 return RS_COLUMN_INVALID;
1156}
1157
1ebc8f2e
ES		 1158static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1159{
1160 u8 tid = IWL_MAX_TID_COUNT;
1161
1162 if (ieee80211_is_data_qos(hdr->frame_control)) {
1163 u8 *qc = ieee80211_get_qos_ctl(hdr);
1164 tid = qc[0] & 0xf;
1165 }
1166
1167 if (unlikely(tid > IWL_MAX_TID_COUNT))
1168 tid = IWL_MAX_TID_COUNT;
1169
1170 return tid;
1171}
1172
1173void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
ff7a68d0 1174 int tid, struct ieee80211_tx_info *info, bool ndp)
8ca151b5
JB		 1175{
1176 int legacy_success;
1177 int retries;
929e6ede 1178 int i;
8ca151b5 1179 struct iwl_lq_cmd *table;
929e6ede
ES		 1180 u32 lq_hwrate;
1181 struct rs_rate lq_rate, tx_resp_rate;
8ca151b5 1182 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
2fd647f8 1183 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
929e6ede 1184 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1ebc8f2e
ES		 1185 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1186 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
859d914c
JB		 1187 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1188 IWL_UCODE_TLV_API_LQ_SS_PARAMS);
8ca151b5 1189
8ca151b5
JB		 1190 /* Treat uninitialized rate scaling data same as non-existing. */
1191 if (!lq_sta) {
1192 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1193 return;
ae969afe 1194 } else if (!lq_sta->pers.drv) {
8ca151b5
JB		 1195 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1196 return;
1197 }
1198
ad82d8a5
ES		 1199 /* This packet was aggregated but doesn't carry status info */
1200 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1201 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1202 return;
1203
1204 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1205
8e96440e 1206#ifdef CONFIG_MAC80211_DEBUGFS
ad82d8a5
ES		 1207 /* Disable last tx check if we are debugging with fixed rate but
1208 * update tx stats */
ae969afe 1209 if (lq_sta->pers.dbg_fixed_rate) {
ad82d8a5
ES		 1210 int index = tx_resp_rate.index;
1211 enum rs_column column;
1212 int attempts, success;
1213
1214 column = rs_get_column_from_rate(&tx_resp_rate);
1215 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1216 "Can't map rate 0x%x to column",
1217 tx_resp_hwrate))
1218 return;
1219
1220 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1221 attempts = info->status.ampdu_len;
1222 success = info->status.ampdu_ack_len;
1223 } else {
1224 attempts = info->status.rates[0].count;
1225 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1226 }
1227
1228 lq_sta->pers.tx_stats[column][index].total += attempts;
1229 lq_sta->pers.tx_stats[column][index].success += success;
1230
1231 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1232 tx_resp_hwrate, success, attempts);
87d5e415
ES		 1233 return;
1234 }
1235#endif
8ca151b5 1236
87d5e415 1237 if (time_after(jiffies,
834437da
ES		 1238 (unsigned long)(lq_sta->last_tx +
1239 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
efad21d2
JB		 1240 int t;
1241
87d5e415 1242 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
efad21d2
JB		 1243 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1244 ieee80211_stop_tx_ba_session(sta, t);
87d5e415 1245
1ebc8f2e 1246 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
87d5e415
ES		 1247 return;
1248 }
1249 lq_sta->last_tx = jiffies;
1250
929e6ede
ES		 1251 /* Ignore this Tx frame response if its initial rate doesn't match
1252 * that of latest Link Quality command. There may be stragglers
1253 * from a previous Link Quality command, but we're no longer interested
1254 * in those; they're either from the "active" mode while we're trying
1255 * to check "search" mode, or a prior "search" mode after we've moved
1256 * to a new "search" mode (which might become the new "active" mode).
1257 */
1258 table = &lq_sta->lq;
1259 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1260 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
929e6ede 1261
8ca151b5 1262 /* Here we actually compare this rate to the latest LQ command */
ba69d0e3 1263 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
8ca151b5 1264 IWL_DEBUG_RATE(mvm,
929e6ede
ES		 1265 "initial tx resp rate 0x%x does not match 0x%x\n",
1266 tx_resp_hwrate, lq_hwrate);
1267
8ca151b5
JB		 1268 /*
1269 * Since rates mis-match, the last LQ command may have failed.
1270 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1271 * ... driver.
1272 */
1273 lq_sta->missed_rate_counter++;
834437da 1274 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
8ca151b5 1275 lq_sta->missed_rate_counter = 0;
b3b06a32
ES		 1276 IWL_DEBUG_RATE(mvm,
1277 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1278 lq_sta->rs_state);
9e680946 1279 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1280 }
1281 /* Regardless, ignore this status info for outdated rate */
1282 return;
1283 } else
1284 /* Rate did match, so reset the missed_rate_counter */
1285 lq_sta->missed_rate_counter = 0;
1286
26a2cc01 1287 if (!lq_sta->search_better_tbl) {
8ca151b5
JB		 1288 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1289 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
26a2cc01 1290 } else {
8ca151b5
JB		 1291 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1292 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
26a2cc01
ES		 1293 }
1294
929e6ede 1295 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
8ca151b5
JB		 1296 IWL_DEBUG_RATE(mvm,
1297 "Neither active nor search matches tx rate\n");
1298 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 1299 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
8ca151b5 1300 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553 1301 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
929e6ede 1302 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
5aa33553 1303
8ca151b5
JB		 1304 /*
1305 * no matching table found, let's by-pass the data collection
1306 * and continue to perform rate scale to find the rate table
1307 */
1308 rs_stay_in_table(lq_sta, true);
1309 goto done;
1310 }
1311
1312 /*
1313 * Updating the frame history depends on whether packets were
1314 * aggregated.
1315 *
1316 * For aggregation, all packets were transmitted at the same rate, the
1317 * first index into rate scale table.
1318 */
1319 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
69c7fda4
GG		 1320 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1321 info->status.ampdu_len,
1322 info->status.ampdu_ack_len,
1323 reduced_txp);
1324
1325 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1326 * it as a single frame loss as we don't want the success ratio
1327 * to dip too quickly because a BA wasn't received.
1328 * For TPC, there's no need for this optimisation since we want
1329 * to recover very quickly from a bad power reduction and,
1330 * therefore we'd like the success ratio to get an immediate hit
1331 * when failing to get a BA, so we'd switch back to a lower or
1332 * zero power reduction. When FW transmits agg with a rate
1333 * different from the initial rate, it will not use reduced txp
1334 * and will send BA notification twice (one empty with reduced
1335 * txp equal to the value from LQ and one with reduced txp 0).
1336 * We need to update counters for each txp level accordingly.
d6bda667
ES		 1337 */
1338 if (info->status.ampdu_ack_len == 0)
1339 info->status.ampdu_len = 1;
1340
69c7fda4
GG		 1341 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1342 info->status.ampdu_len,
1343 info->status.ampdu_ack_len);
8ca151b5
JB		 1344
1345 /* Update success/fail counts if not searching for new mode */
b3b06a32 1346 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1347 lq_sta->total_success += info->status.ampdu_ack_len;
1348 lq_sta->total_failed += (info->status.ampdu_len -
1349 info->status.ampdu_ack_len);
1350 }
1351 } else {
90cb1237 1352 /* For legacy, update frame history with for each Tx retry. */
8ca151b5
JB		 1353 retries = info->status.rates[0].count - 1;
1354 /* HW doesn't send more than 15 retries */
1355 retries = min(retries, 15);
1356
1357 /* The last transmission may have been successful */
1358 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1359 /* Collect data for each rate used during failed TX attempts */
1360 for (i = 0; i <= retries; ++i) {
929e6ede
ES		 1361 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1362 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1363 &lq_rate);
8ca151b5
JB		 1364 /*
1365 * Only collect stats if retried rate is in the same RS
1366 * table as active/search.
1367 */
929e6ede 1368 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
8ca151b5 1369 tmp_tbl = curr_tbl;
929e6ede
ES		 1370 else if (rs_rate_column_match(&lq_rate,
1371 &other_tbl->rate))
8ca151b5 1372 tmp_tbl = other_tbl;
4107dbd2 1373 else
8ca151b5 1374 continue;
4107dbd2 1375
69c7fda4
GG		 1376 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1377 lq_rate.index, 1,
1378 i < retries ? 0 : legacy_success,
1379 reduced_txp);
1380 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1381 lq_rate.index, 1,
1382 i < retries ? 0 : legacy_success);
8ca151b5
JB		 1383 }
1384
1385 /* Update success/fail counts if not searching for new mode */
b3b06a32 1386 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1387 lq_sta->total_success += legacy_success;
1388 lq_sta->total_failed += retries + (1 - legacy_success);
1389 }
1390 }
1391 /* The last TX rate is cached in lq_sta; it's set in if/else above */
929e6ede 1392 lq_sta->last_rate_n_flags = lq_hwrate;
2fd647f8 1393 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
8ca151b5
JB		 1394done:
1395 /* See if there's a better rate or modulation mode to try. */
8dfc2751 1396 if (sta->supp_rates[info->band])
ff7a68d0 1397 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1ebc8f2e
ES		 1398}
1399
1400/*
1401 * mac80211 sends us Tx status
1402 */
1403static void rs_mac80211_tx_status(void *mvm_r,
1404 struct ieee80211_supported_band *sband,
1405 struct ieee80211_sta *sta, void *priv_sta,
1406 struct sk_buff *skb)
1407{
1408 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1409 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1410 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1411 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1412
dcbc17ad
JB		 1413 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1414 return;
1415
1ebc8f2e
ES		 1416 if (!ieee80211_is_data(hdr->frame_control) ||
1417 info->flags & IEEE80211_TX_CTL_NO_ACK)
1418 return;
1419
ff7a68d0
MG		 1420 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1421 ieee80211_is_qos_nullfunc(hdr->frame_control));
8ca151b5
JB		 1422}
1423
1424/*
1425 * Begin a period of staying with a selected modulation mode.
1426 * Set "stay_in_tbl" flag to prevent any mode switches.
1427 * Set frame tx success limits according to legacy vs. high-throughput,
1428 * and reset overall (spanning all rates) tx success history statistics.
1429 * These control how long we stay using same modulation mode before
1430 * searching for a new mode.
1431 */
1432static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1433 struct iwl_lq_sta *lq_sta)
1434{
b3b06a32
ES		 1435 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1436 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
8ca151b5 1437 if (is_legacy) {
834437da
ES		 1438 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1439 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1440 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
8ca151b5 1441 } else {
834437da
ES		 1442 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1443 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1444 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
8ca151b5
JB		 1445 }
1446 lq_sta->table_count = 0;
1447 lq_sta->total_failed = 0;
1448 lq_sta->total_success = 0;
1449 lq_sta->flush_timer = jiffies;
b3b06a32 1450 lq_sta->visited_columns = 0;
8ca151b5
JB		 1451}
1452
6a028d9a
ES		 1453static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1454{
1455 if (rate_mask)
1456 return find_last_bit(&rate_mask, BITS_PER_LONG);
1457 return IWL_RATE_INVALID;
1458}
1459
198266a3
ES		 1460static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1461 const struct rs_tx_column *column)
1462{
1463 switch (column->mode) {
1464 case RS_LEGACY:
1465 return lq_sta->max_legacy_rate_idx;
1466 case RS_SISO:
1467 return lq_sta->max_siso_rate_idx;
1468 case RS_MIMO2:
1469 return lq_sta->max_mimo2_rate_idx;
1470 default:
1471 WARN_ON_ONCE(1);
1472 }
1473
1474 return lq_sta->max_legacy_rate_idx;
1475}
1476
a34529e8 1477static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
198266a3
ES		 1478 const struct rs_tx_column *column,
1479 u32 bw)
8ca151b5
JB		 1480{
1481 /* Used to choose among HT tables */
a34529e8 1482 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
8ca151b5 1483
b3b06a32
ES		 1484 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1485 column->mode != RS_SISO &&
1486 column->mode != RS_MIMO2))
1487 return expected_tpt_legacy;
8ca151b5
JB		 1488
1489 /* Legacy rates have only one table */
b3b06a32
ES		 1490 if (column->mode == RS_LEGACY)
1491 return expected_tpt_legacy;
8ca151b5 1492
d310e405 1493 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
8ca151b5 1494 /* Choose among many HT tables depending on number of streams
d310e405 1495 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
8ca151b5 1496 * status */
b3b06a32
ES		 1497 if (column->mode == RS_SISO) {
1498 switch (bw) {
d310e405
ES		 1499 case RATE_MCS_CHAN_WIDTH_20:
1500 ht_tbl_pointer = expected_tpt_siso_20MHz;
1501 break;
1502 case RATE_MCS_CHAN_WIDTH_40:
1503 ht_tbl_pointer = expected_tpt_siso_40MHz;
1504 break;
1505 case RATE_MCS_CHAN_WIDTH_80:
1506 ht_tbl_pointer = expected_tpt_siso_80MHz;
1507 break;
855f492f
GG		 1508 case RATE_MCS_CHAN_WIDTH_160:
1509 ht_tbl_pointer = expected_tpt_siso_160MHz;
1510 break;
d310e405
ES		 1511 default:
1512 WARN_ON_ONCE(1);
1513 }
b3b06a32
ES		 1514 } else if (column->mode == RS_MIMO2) {
1515 switch (bw) {
d310e405
ES		 1516 case RATE_MCS_CHAN_WIDTH_20:
1517 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1518 break;
1519 case RATE_MCS_CHAN_WIDTH_40:
1520 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1521 break;
1522 case RATE_MCS_CHAN_WIDTH_80:
1523 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1524 break;
855f492f
GG		 1525 case RATE_MCS_CHAN_WIDTH_160:
1526 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1527 break;
d310e405
ES		 1528 default:
1529 WARN_ON_ONCE(1);
1530 }
1531 } else {
1532 WARN_ON_ONCE(1);
d972ab31 1533 }
8ca151b5 1534
b3b06a32
ES		 1535 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1536 return ht_tbl_pointer[0];
1537 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1538 return ht_tbl_pointer[1];
1539 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1540 return ht_tbl_pointer[2];
8ca151b5 1541 else /* AGG+SGI */
b3b06a32
ES		 1542 return ht_tbl_pointer[3];
1543}
1544
1545static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1546 struct iwl_scale_tbl_info *tbl)
1547{
1548 struct rs_rate *rate = &tbl->rate;
1549 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1550
1551 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
8ca151b5
JB		 1552}
1553
8ca151b5
JB		 1554static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1555 struct iwl_lq_sta *lq_sta,
1556 struct iwl_scale_tbl_info *tbl, /* "search" */
80763515 1557 unsigned long rate_mask, s8 index)
8ca151b5 1558{
8ca151b5
JB		 1559 struct iwl_scale_tbl_info *active_tbl =
1560 &(lq_sta->lq_info[lq_sta->active_tbl]);
80763515
ES		 1561 s32 success_ratio = active_tbl->win[index].success_ratio;
1562 u16 expected_current_tpt = active_tbl->expected_tpt[index];
a34529e8 1563 const u16 *tpt_tbl = tbl->expected_tpt;
8ca151b5 1564 u16 high_low;
80763515
ES		 1565 u32 target_tpt;
1566 int rate_idx;
8ca151b5 1567
ed21a384 1568 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
80763515
ES		 1569 target_tpt = 100 * expected_current_tpt;
1570 IWL_DEBUG_RATE(mvm,
1571 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1572 success_ratio, target_tpt);
1573 } else {
1574 target_tpt = lq_sta->last_tpt;
1575 IWL_DEBUG_RATE(mvm,
ed21a384 1576 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
80763515
ES		 1577 success_ratio, target_tpt);
1578 }
8ca151b5 1579
80763515 1580 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
8ca151b5 1581
80763515
ES		 1582 while (rate_idx != IWL_RATE_INVALID) {
1583 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1584 break;
8ca151b5 1585
80763515
ES		 1586 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1587 tbl->rate.type);
8ca151b5 1588
80763515 1589 rate_idx = (high_low >> 8) & 0xff;
8ca151b5
JB		 1590 }
1591
80763515
ES		 1592 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1593 rate_idx, target_tpt,
1594 rate_idx != IWL_RATE_INVALID ?
1595 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1596
1597 return rate_idx;
8ca151b5
JB		 1598}
1599
5aa33553 1600static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
d310e405 1601{
855f492f
GG		 1602 switch (sta->bandwidth) {
1603 case IEEE80211_STA_RX_BW_160:
1604 return RATE_MCS_CHAN_WIDTH_160;
1605 case IEEE80211_STA_RX_BW_80:
5aa33553 1606 return RATE_MCS_CHAN_WIDTH_80;
855f492f 1607 case IEEE80211_STA_RX_BW_40:
5aa33553 1608 return RATE_MCS_CHAN_WIDTH_40;
855f492f
GG		 1609 case IEEE80211_STA_RX_BW_20:
1610 default:
1611 return RATE_MCS_CHAN_WIDTH_20;
1612 }
d310e405
ES		 1613}
1614
8ca151b5
JB		 1615/*
1616 * Check whether we should continue using same modulation mode, or
1617 * begin search for a new mode, based on:
1618 * 1) # tx successes or failures while using this mode
1619 * 2) # times calling this function
1620 * 3) elapsed time in this mode (not used, for now)
1621 */
1622static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1623{
1624 struct iwl_scale_tbl_info *tbl;
8ca151b5
JB		 1625 int active_tbl;
1626 int flush_interval_passed = 0;
1627 struct iwl_mvm *mvm;
1628
ae969afe 1629 mvm = lq_sta->pers.drv;
8ca151b5
JB		 1630 active_tbl = lq_sta->active_tbl;
1631
1632 tbl = &(lq_sta->lq_info[active_tbl]);
1633
1634 /* If we've been disallowing search, see if we should now allow it */
b3b06a32 1635 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1636 /* Elapsed time using current modulation mode */
1637 if (lq_sta->flush_timer)
1638 flush_interval_passed =
1639 time_after(jiffies,
1640 (unsigned long)(lq_sta->flush_timer +
834437da 1641 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
8ca151b5
JB		 1642
1643 /*
1644 * Check if we should allow search for new modulation mode.
1645 * If many frames have failed or succeeded, or we've used
1646 * this same modulation for a long time, allow search, and
1647 * reset history stats that keep track of whether we should
1648 * allow a new search. Also (below) reset all bitmaps and
1649 * stats in active history.
1650 */
1651 if (force_search ||
1652 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1653 (lq_sta->total_success > lq_sta->max_success_limit) ||
1654 ((!lq_sta->search_better_tbl) &&
1655 (lq_sta->flush_timer) && (flush_interval_passed))) {
1656 IWL_DEBUG_RATE(mvm,
1657 "LQ: stay is expired %d %d %d\n",
1658 lq_sta->total_failed,
1659 lq_sta->total_success,
1660 flush_interval_passed);
1661
1662 /* Allow search for new mode */
b3b06a32
ES		 1663 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1664 IWL_DEBUG_RATE(mvm,
1665 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
8ca151b5
JB		 1666 lq_sta->total_failed = 0;
1667 lq_sta->total_success = 0;
1668 lq_sta->flush_timer = 0;
b3b06a32
ES		 1669 /* mark the current column as visited */
1670 lq_sta->visited_columns = BIT(tbl->column);
8ca151b5
JB		 1671 /*
1672 * Else if we've used this modulation mode enough repetitions
1673 * (regardless of elapsed time or success/failure), reset
1674 * history bitmaps and rate-specific stats for all rates in
1675 * active table.
1676 */
1677 } else {
1678 lq_sta->table_count++;
1679 if (lq_sta->table_count >=
1680 lq_sta->table_count_limit) {
1681 lq_sta->table_count = 0;
1682
1683 IWL_DEBUG_RATE(mvm,
1684 "LQ: stay in table clear win\n");
b804eeb6 1685 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1686 }
1687 }
1688
1689 /* If transitioning to allow "search", reset all history
1690 * bitmaps and stats in active table (this will become the new
1691 * "search" table). */
b3b06a32 1692 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
b804eeb6 1693 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1694 }
1695 }
1696}
1697
04e3a5da
EG		 1698static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1699 struct iwl_scale_tbl_info *tbl,
1700 enum rs_action scale_action)
1701{
1702 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1703
1704 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1705 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1706 scale_action == RS_ACTION_DOWNSCALE)
1707 sta_priv->tlc_amsdu = false;
1708 else
1709 sta_priv->tlc_amsdu = true;
1710}
1711
8ca151b5
JB		 1712/*
1713 * setup rate table in uCode
1714 */
1715static void rs_update_rate_tbl(struct iwl_mvm *mvm,
9145d151 1716 struct ieee80211_sta *sta,
8ca151b5 1717 struct iwl_lq_sta *lq_sta,
7b9d74e4 1718 struct iwl_scale_tbl_info *tbl)
8ca151b5 1719{
7b9d74e4 1720 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
9e680946 1721 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1722}
1723
1191f646
ES		 1724static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1725 struct ieee80211_sta *sta,
1726 struct iwl_lq_sta *lq_sta,
1727 struct iwl_scale_tbl_info *tbl,
1728 enum rs_action scale_action)
1729{
1730 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1731 return false;
1732
1733 if (!is_vht_siso(&tbl->rate))
1734 return false;
1735
1736 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1737 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1738 (scale_action == RS_ACTION_DOWNSCALE)) {
1739 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1740 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1741 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1742 goto tweaked;
1743 }
1744
1745 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1746 * sustainable, i.e. we're past the test window. We can't go back
1747 * if MCS5 is just tested as this will happen always after switching
1748 * to 20Mhz MCS4 because the rate stats are cleared.
1749 */
1750 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1751 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1752 (scale_action == RS_ACTION_STAY)) ||
1753 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1754 (scale_action == RS_ACTION_UPSCALE)))) {
1755 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1756 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1757 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1758 goto tweaked;
1759 }
1760
1761 return false;
1762
1763tweaked:
1764 rs_set_expected_tpt_table(lq_sta, tbl);
1765 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1766 return true;
1767}
1768
b3b06a32
ES		 1769static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1770 struct iwl_lq_sta *lq_sta,
1771 struct ieee80211_sta *sta,
1772 struct iwl_scale_tbl_info *tbl)
1773{
198266a3 1774 int i, j, max_rate;
b3b06a32
ES		 1775 enum rs_column next_col_id;
1776 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1777 const struct rs_tx_column *next_col;
1778 allow_column_func_t allow_func;
a0544272 1779 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
a34529e8 1780 const u16 *expected_tpt_tbl;
198266a3 1781 u16 tpt, max_expected_tpt;
b3b06a32
ES		 1782
1783 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1784 next_col_id = curr_col->next_columns[i];
1785
1786 if (next_col_id == RS_COLUMN_INVALID)
1787 continue;
1788
1789 if (lq_sta->visited_columns & BIT(next_col_id)) {
1790 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1791 next_col_id);
1792 continue;
1793 }
1794
1795 next_col = &rs_tx_columns[next_col_id];
1796
1797 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1798 IWL_DEBUG_RATE(mvm,
1799 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1800 next_col_id, valid_ants, next_col->ant);
1801 continue;
1802 }
1803
1804 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1805 allow_func = next_col->checks[j];
bb8f44c9
ES		 1806 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1807 next_col))
b3b06a32
ES		 1808 break;
1809 }
1810
1811 if (j != MAX_COLUMN_CHECKS) {
1812 IWL_DEBUG_RATE(mvm,
1813 "Skip column %d: not allowed (check %d failed)\n",
1814 next_col_id, j);
1815
1816 continue;
1817 }
1818
1819 tpt = lq_sta->last_tpt / 100;
1820 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
049e0c33 1821 rs_bw_from_sta_bw(sta));
b3b06a32
ES		 1822 if (WARN_ON_ONCE(!expected_tpt_tbl))
1823 continue;
1824
198266a3 1825 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
6a028d9a
ES		 1826 if (max_rate == IWL_RATE_INVALID) {
1827 IWL_DEBUG_RATE(mvm,
1828 "Skip column %d: no rate is allowed in this column\n",
1829 next_col_id);
198266a3 1830 continue;
6a028d9a 1831 }
b3b06a32 1832
198266a3 1833 max_expected_tpt = expected_tpt_tbl[max_rate];
b3b06a32
ES		 1834 if (tpt >= max_expected_tpt) {
1835 IWL_DEBUG_RATE(mvm,
1836 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1837 next_col_id, max_expected_tpt, tpt);
1838 continue;
1839 }
1840
198266a3
ES		 1841 IWL_DEBUG_RATE(mvm,
1842 "Found potential column %d. Max expected %d current %d\n",
1843 next_col_id, max_expected_tpt, tpt);
b3b06a32
ES		 1844 break;
1845 }
1846
1847 if (i == MAX_NEXT_COLUMNS)
1848 return RS_COLUMN_INVALID;
1849
b3b06a32
ES		 1850 return next_col_id;
1851}
1852
1853static int rs_switch_to_column(struct iwl_mvm *mvm,
1854 struct iwl_lq_sta *lq_sta,
1855 struct ieee80211_sta *sta,
1856 enum rs_column col_id)
1857{
1858 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1859 struct iwl_scale_tbl_info *search_tbl =
1860 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1861 struct rs_rate *rate = &search_tbl->rate;
1862 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1863 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1864 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1865 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
80763515 1866 unsigned long rate_mask = 0;
b3b06a32
ES		 1867 u32 rate_idx = 0;
1868
1869 memcpy(search_tbl, tbl, sz);
1870
1871 rate->sgi = column->sgi;
1872 rate->ant = column->ant;
1873
1874 if (column->mode == RS_LEGACY) {
57fbcce3 1875 if (lq_sta->band == NL80211_BAND_5GHZ)
b3b06a32
ES		 1876 rate->type = LQ_LEGACY_A;
1877 else
1878 rate->type = LQ_LEGACY_G;
1879
d8bafeaf
ES		 1880 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1881 rate->ldpc = false;
b3b06a32
ES		 1882 rate_mask = lq_sta->active_legacy_rate;
1883 } else if (column->mode == RS_SISO) {
1884 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1885 rate_mask = lq_sta->active_siso_rate;
1886 } else if (column->mode == RS_MIMO2) {
1887 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1888 rate_mask = lq_sta->active_mimo2_rate;
1889 } else {
7281b164 1890 WARN_ONCE(1, "Bad column mode");
b3b06a32
ES		 1891 }
1892
d8bafeaf
ES		 1893 if (column->mode != RS_LEGACY) {
1894 rate->bw = rs_bw_from_sta_bw(sta);
1895 rate->ldpc = lq_sta->ldpc;
1896 }
1897
b3b06a32
ES		 1898 search_tbl->column = col_id;
1899 rs_set_expected_tpt_table(lq_sta, search_tbl);
1900
75d3e2d6
ES		 1901 lq_sta->visited_columns |= BIT(col_id);
1902
b3b06a32
ES		 1903 /* Get the best matching rate if we're changing modes. e.g.
1904 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1905 */
1906 if (curr_column->mode != column->mode) {
1907 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1908 rate_mask, rate->index);
1909
1910 if ((rate_idx == IWL_RATE_INVALID) ||
1911 !(BIT(rate_idx) & rate_mask)) {
1912 IWL_DEBUG_RATE(mvm,
1913 "can not switch with index %d"
80763515 1914 " rate mask %lx\n",
b3b06a32
ES		 1915 rate_idx, rate_mask);
1916
1917 goto err;
1918 }
1919
1920 rate->index = rate_idx;
1921 }
1922
b3b06a32
ES		 1923 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1924 col_id, rate->index);
1925
b3b06a32
ES		 1926 return 0;
1927
1928err:
1929 rate->type = LQ_NONE;
1930 return -1;
1931}
1932
4e4b815c
ES		 1933static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1934 struct iwl_scale_tbl_info *tbl,
1935 s32 sr, int low, int high,
1936 int current_tpt,
1937 int low_tpt, int high_tpt)
1938{
1939 enum rs_action action = RS_ACTION_STAY;
1940
834437da
ES		 1941 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1942 (current_tpt == 0)) {
4e4b815c 1943 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1944 "Decrease rate because of low SR\n");
1945 return RS_ACTION_DOWNSCALE;
4e4b815c
ES		 1946 }
1947
e53839eb
ES		 1948 if ((low_tpt == IWL_INVALID_VALUE) &&
1949 (high_tpt == IWL_INVALID_VALUE) &&
1950 (high != IWL_RATE_INVALID)) {
4e4b815c 1951 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1952 "No data about high/low rates. Increase rate\n");
1953 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1954 }
1955
e53839eb
ES		 1956 if ((high_tpt == IWL_INVALID_VALUE) &&
1957 (high != IWL_RATE_INVALID) &&
1958 (low_tpt != IWL_INVALID_VALUE) &&
1959 (low_tpt < current_tpt)) {
1960 IWL_DEBUG_RATE(mvm,
1961 "No data about high rate and low rate is worse. Increase rate\n");
1962 return RS_ACTION_UPSCALE;
1963 }
4e4b815c 1964
e53839eb
ES		 1965 if ((high_tpt != IWL_INVALID_VALUE) &&
1966 (high_tpt > current_tpt)) {
1967 IWL_DEBUG_RATE(mvm,
1968 "Higher rate is better. Increate rate\n");
1969 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1970 }
1971
e53839eb
ES		 1972 if ((low_tpt != IWL_INVALID_VALUE) &&
1973 (high_tpt != IWL_INVALID_VALUE) &&
1974 (low_tpt < current_tpt) &&
1975 (high_tpt < current_tpt)) {
4e4b815c 1976 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1977 "Both high and low are worse. Maintain rate\n");
1978 return RS_ACTION_STAY;
1979 }
1980
1981 if ((low_tpt != IWL_INVALID_VALUE) &&
1982 (low_tpt > current_tpt)) {
1983 IWL_DEBUG_RATE(mvm,
1984 "Lower rate is better\n");
1985 action = RS_ACTION_DOWNSCALE;
1986 goto out;
1987 }
1988
1989 if ((low_tpt == IWL_INVALID_VALUE) &&
1990 (low != IWL_RATE_INVALID)) {
4e4b815c 1991 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1992 "No data about lower rate\n");
1993 action = RS_ACTION_DOWNSCALE;
1994 goto out;
1995 }
1996
1997 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1998
1999out:
2000 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
834437da 2001 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
e53839eb
ES		 2002 IWL_DEBUG_RATE(mvm,
2003 "SR is above NO DECREASE. Avoid downscale\n");
2004 action = RS_ACTION_STAY;
2005 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2006 IWL_DEBUG_RATE(mvm,
2007 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2008 action = RS_ACTION_STAY;
2009 } else {
2010 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2011 }
4e4b815c
ES		 2012 }
2013
2014 return action;
2015}
b3b06a32 2016
d8bafeaf
ES		 2017static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2018 struct iwl_lq_sta *lq_sta)
2019{
d8bafeaf
ES		 2020 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2021 * supports STBC of at least 1*SS
2022 */
3d44eebf 2023 if (!lq_sta->stbc_capable)
d8bafeaf
ES		 2024 return false;
2025
d8bafeaf
ES		 2026 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2027 return false;
2028
2029 return true;
2030}
2031
2fd647f8
EP		 2032static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2033 int *weaker, int *stronger)
2034{
834437da 2035 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2fd647f8
EP		 2036 if (*weaker > TPC_MAX_REDUCTION)
2037 *weaker = TPC_INVALID;
2038
834437da 2039 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2fd647f8
EP		 2040 if (*stronger < 0)
2041 *stronger = TPC_INVALID;
2042}
2043
1e9551de 2044static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
57fbcce3 2045 struct rs_rate *rate, enum nl80211_band band)
2fd647f8
EP		 2046{
2047 int index = rate->index;
1e9551de
ES		 2048 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2049 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2050 !vif->bss_conf.ps);
2fd647f8 2051
1e9551de
ES		 2052 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2053 cam, sta_ps_disabled);
2fd647f8
EP		 2054 /*
2055 * allow tpc only if power management is enabled, or bt coex
2056 * activity grade allows it and we are on 2.4Ghz.
2057 */
1e9551de 2058 if ((cam || sta_ps_disabled) &&
2fd647f8
EP		 2059 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2060 return false;
2061
2062 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2063 if (is_legacy(rate))
2064 return index == IWL_RATE_54M_INDEX;
2065 if (is_ht(rate))
2066 return index == IWL_RATE_MCS_7_INDEX;
2067 if (is_vht(rate))
2068 return index == IWL_RATE_MCS_7_INDEX ||
2069 index == IWL_RATE_MCS_8_INDEX ||
2070 index == IWL_RATE_MCS_9_INDEX;
2071
2072 WARN_ON_ONCE(1);
2073 return false;
2074}
2075
2076enum tpc_action {
2077 TPC_ACTION_STAY,
2078 TPC_ACTION_DECREASE,
2079 TPC_ACTION_INCREASE,
2080 TPC_ACTION_NO_RESTIRCTION,
2081};
2082
2083static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2084 s32 sr, int weak, int strong,
2085 int current_tpt,
2086 int weak_tpt, int strong_tpt)
2087{
2088 /* stay until we have valid tpt */
2089 if (current_tpt == IWL_INVALID_VALUE) {
2090 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2091 return TPC_ACTION_STAY;
2092 }
2093
2094 /* Too many failures, increase txp */
834437da
ES		 2095 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2096 current_tpt == 0) {
2fd647f8
EP		 2097 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2098 return TPC_ACTION_NO_RESTIRCTION;
2099 }
2100
2101 /* try decreasing first if applicable */
6ad6c01f
GG		 2102 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2103 weak != TPC_INVALID) {
2fd647f8
EP		 2104 if (weak_tpt == IWL_INVALID_VALUE &&
2105 (strong_tpt == IWL_INVALID_VALUE ||
2106 current_tpt >= strong_tpt)) {
2107 IWL_DEBUG_RATE(mvm,
2108 "no weak txp measurement. decrease txp\n");
2109 return TPC_ACTION_DECREASE;
2110 }
2111
2112 if (weak_tpt > current_tpt) {
2113 IWL_DEBUG_RATE(mvm,
2114 "lower txp has better tpt. decrease txp\n");
2115 return TPC_ACTION_DECREASE;
2116 }
2117 }
2118
2119 /* next, increase if needed */
834437da
ES		 2120 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2121 strong != TPC_INVALID) {
2fd647f8
EP		 2122 if (weak_tpt == IWL_INVALID_VALUE &&
2123 strong_tpt != IWL_INVALID_VALUE &&
2124 current_tpt < strong_tpt) {
2125 IWL_DEBUG_RATE(mvm,
2126 "higher txp has better tpt. increase txp\n");
2127 return TPC_ACTION_INCREASE;
2128 }
2129
2130 if (weak_tpt < current_tpt &&
2131 (strong_tpt == IWL_INVALID_VALUE ||
2132 strong_tpt > current_tpt)) {
2133 IWL_DEBUG_RATE(mvm,
2134 "lower txp has worse tpt. increase txp\n");
2135 return TPC_ACTION_INCREASE;
2136 }
2137 }
2138
2139 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2140 return TPC_ACTION_STAY;
2141}
2142
2143static bool rs_tpc_perform(struct iwl_mvm *mvm,
2144 struct ieee80211_sta *sta,
2145 struct iwl_lq_sta *lq_sta,
2146 struct iwl_scale_tbl_info *tbl)
2147{
9d8ce6af 2148 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2fd647f8
EP		 2149 struct ieee80211_vif *vif = mvm_sta->vif;
2150 struct ieee80211_chanctx_conf *chanctx_conf;
57fbcce3 2151 enum nl80211_band band;
2fd647f8
EP		 2152 struct iwl_rate_scale_data *window;
2153 struct rs_rate *rate = &tbl->rate;
2154 enum tpc_action action;
2155 s32 sr;
2156 u8 cur = lq_sta->lq.reduced_tpc;
2157 int current_tpt;
2158 int weak, strong;
2159 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2160
9a75b3df 2161#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 2162 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
3c6acb61 2163 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
ae969afe
EP		 2164 lq_sta->pers.dbg_fixed_txp_reduction);
2165 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2166 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
9a75b3df
EP		 2167 }
2168#endif
2169
2fd647f8
EP		 2170 rcu_read_lock();
2171 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2172 if (WARN_ON(!chanctx_conf))
57fbcce3 2173 band = NUM_NL80211_BANDS;
2fd647f8
EP		 2174 else
2175 band = chanctx_conf->def.chan->band;
2176 rcu_read_unlock();
2177
1e9551de 2178 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2fd647f8 2179 IWL_DEBUG_RATE(mvm,
3c6acb61 2180 "tpc is not allowed. remove txp restrictions\n");
2fd647f8
EP		 2181 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2182 return cur != TPC_NO_REDUCTION;
2183 }
2184
2185 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2186
2187 /* Collect measured throughputs for current and adjacent rates */
2188 window = tbl->tpc_win;
2189 sr = window[cur].success_ratio;
2190 current_tpt = window[cur].average_tpt;
2191 if (weak != TPC_INVALID)
2192 weak_tpt = window[weak].average_tpt;
2193 if (strong != TPC_INVALID)
2194 strong_tpt = window[strong].average_tpt;
2195
2196 IWL_DEBUG_RATE(mvm,
2197 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2198 cur, current_tpt, sr, weak, strong,
2199 weak_tpt, strong_tpt);
2200
2201 action = rs_get_tpc_action(mvm, sr, weak, strong,
2202 current_tpt, weak_tpt, strong_tpt);
2203
2204 /* override actions if we are on the edge */
2205 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
3c6acb61 2206 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2fd647f8
EP		 2207 action = TPC_ACTION_STAY;
2208 } else if (strong == TPC_INVALID &&
2209 (action == TPC_ACTION_INCREASE ||
2210 action == TPC_ACTION_NO_RESTIRCTION)) {
3c6acb61 2211 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2fd647f8
EP		 2212 action = TPC_ACTION_STAY;
2213 }
2214
2215 switch (action) {
2216 case TPC_ACTION_DECREASE:
2217 lq_sta->lq.reduced_tpc = weak;
2218 return true;
2219 case TPC_ACTION_INCREASE:
2220 lq_sta->lq.reduced_tpc = strong;
2221 return true;
2222 case TPC_ACTION_NO_RESTIRCTION:
2223 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2224 return true;
2225 case TPC_ACTION_STAY:
2226 /* do nothing */
2227 break;
2228 }
2229 return false;
2230}
2231
8ca151b5
JB		 2232/*
2233 * Do rate scaling and search for new modulation mode.
2234 */
2235static void rs_rate_scale_perform(struct iwl_mvm *mvm,
8ca151b5 2236 struct ieee80211_sta *sta,
1ebc8f2e 2237 struct iwl_lq_sta *lq_sta,
ff7a68d0 2238 int tid, bool ndp)
8ca151b5 2239{
8ca151b5
JB		 2240 int low = IWL_RATE_INVALID;
2241 int high = IWL_RATE_INVALID;
2242 int index;
8ca151b5
JB		 2243 struct iwl_rate_scale_data *window = NULL;
2244 int current_tpt = IWL_INVALID_VALUE;
2245 int low_tpt = IWL_INVALID_VALUE;
2246 int high_tpt = IWL_INVALID_VALUE;
2247 u32 fail_count;
4e4b815c 2248 enum rs_action scale_action = RS_ACTION_STAY;
8ca151b5
JB		 2249 u16 rate_mask;
2250 u8 update_lq = 0;
2251 struct iwl_scale_tbl_info *tbl, *tbl1;
8ca151b5
JB		 2252 u8 active_tbl = 0;
2253 u8 done_search = 0;
2254 u16 high_low;
2255 s32 sr;
9d015a03 2256 u8 prev_agg = lq_sta->is_agg;
9d8ce6af 2257 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
8ca151b5 2258 struct iwl_mvm_tid_data *tid_data;
5aa33553 2259 struct rs_rate *rate;
8ca151b5 2260
efed6640 2261 lq_sta->is_agg = !!sta_priv->agg_tids;
8ca151b5
JB		 2262
2263 /*
2264 * Select rate-scale / modulation-mode table to work with in
2265 * the rest of this function: "search" if searching for better
2266 * modulation mode, or "active" if doing rate scaling within a mode.
2267 */
2268 if (!lq_sta->search_better_tbl)
2269 active_tbl = lq_sta->active_tbl;
2270 else
2271 active_tbl = 1 - lq_sta->active_tbl;
2272
2273 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2274 rate = &tbl->rate;
8ca151b5 2275
9d015a03
ES		 2276 if (prev_agg != lq_sta->is_agg) {
2277 IWL_DEBUG_RATE(mvm,
2278 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2279 prev_agg, lq_sta->is_agg);
2280 rs_set_expected_tpt_table(lq_sta, tbl);
b804eeb6 2281 rs_rate_scale_clear_tbl_windows(mvm, tbl);
9d015a03
ES		 2282 }
2283
8ca151b5 2284 /* current tx rate */
fcc5e851 2285 index = rate->index;
8ca151b5 2286
8ca151b5 2287 /* rates available for this association, and for modulation mode */
a8ff14f5 2288 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5 2289
ca6f38ff 2290 if (!(BIT(index) & rate_mask)) {
8ca151b5
JB		 2291 IWL_ERR(mvm, "Current Rate is not valid\n");
2292 if (lq_sta->search_better_tbl) {
2293 /* revert to active table if search table is not valid*/
5aa33553 2294 rate->type = LQ_NONE;
8ca151b5
JB		 2295 lq_sta->search_better_tbl = 0;
2296 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
7b9d74e4 2297 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
8ca151b5
JB		 2298 }
2299 return;
2300 }
2301
2302 /* Get expected throughput table and history window for current rate */
2303 if (!tbl->expected_tpt) {
2304 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2305 return;
2306 }
2307
2536e7c3 2308 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2309 window = &(tbl->win[index]);
2310
2311 /*
2312 * If there is not enough history to calculate actual average
2313 * throughput, keep analyzing results of more tx frames, without
2314 * changing rate or mode (bypass most of the rest of this function).
2315 * Set up new rate table in uCode only if old rate is not supported
2316 * in current association (use new rate found above).
2317 */
2318 fail_count = window->counter - window->success_counter;
834437da
ES		 2319 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2320 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
8ca151b5 2321 IWL_DEBUG_RATE(mvm,
cc60c6e9
ES		 2322 "%s: Test Window: succ %d total %d\n",
2323 rs_pretty_rate(rate),
2324 window->success_counter, window->counter);
8ca151b5
JB		 2325
2326 /* Can't calculate this yet; not enough history */
2327 window->average_tpt = IWL_INVALID_VALUE;
2328
2329 /* Should we stay with this modulation mode,
2330 * or search for a new one? */
2331 rs_stay_in_table(lq_sta, false);
2332
fcc5e851 2333 return;
8ca151b5 2334 }
8ca151b5
JB		 2335
2336 /* If we are searching for better modulation mode, check success. */
2337 if (lq_sta->search_better_tbl) {
2338 /* If good success, continue using the "search" mode;
2339 * no need to send new link quality command, since we're
2340 * continuing to use the setup that we've been trying. */
2341 if (window->average_tpt > lq_sta->last_tpt) {
2342 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2343 "SWITCHING TO NEW TABLE SR: %d "
2344 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2345 window->success_ratio,
2346 window->average_tpt,
2347 lq_sta->last_tpt);
2348
8ca151b5
JB		 2349 /* Swap tables; "search" becomes "active" */
2350 lq_sta->active_tbl = active_tbl;
2351 current_tpt = window->average_tpt;
2352 /* Else poor success; go back to mode in "active" table */
2353 } else {
2354 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2355 "GOING BACK TO THE OLD TABLE: SR %d "
2356 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2357 window->success_ratio,
2358 window->average_tpt,
2359 lq_sta->last_tpt);
2360
2361 /* Nullify "search" table */
5aa33553 2362 rate->type = LQ_NONE;
8ca151b5
JB		 2363
2364 /* Revert to "active" table */
2365 active_tbl = lq_sta->active_tbl;
2366 tbl = &(lq_sta->lq_info[active_tbl]);
2367
2368 /* Revert to "active" rate and throughput info */
8fc7c58c 2369 index = tbl->rate.index;
8ca151b5
JB		 2370 current_tpt = lq_sta->last_tpt;
2371
2372 /* Need to set up a new rate table in uCode */
2373 update_lq = 1;
2374 }
2375
2376 /* Either way, we've made a decision; modulation mode
2377 * search is done, allow rate adjustment next time. */
2378 lq_sta->search_better_tbl = 0;
2379 done_search = 1; /* Don't switch modes below! */
2380 goto lq_update;
2381 }
2382
2383 /* (Else) not in search of better modulation mode, try for better
2384 * starting rate, while staying in this mode. */
ca6f38ff 2385 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
8ca151b5
JB		 2386 low = high_low & 0xff;
2387 high = (high_low >> 8) & 0xff;
2388
2536e7c3 2389 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2390
2391 sr = window->success_ratio;
2392
2393 /* Collect measured throughputs for current and adjacent rates */
2394 current_tpt = window->average_tpt;
2395 if (low != IWL_RATE_INVALID)
2396 low_tpt = tbl->win[low].average_tpt;
2397 if (high != IWL_RATE_INVALID)
2398 high_tpt = tbl->win[high].average_tpt;
2399
4d30ee82 2400 IWL_DEBUG_RATE(mvm,
cc60c6e9
ES		 2401 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2402 rs_pretty_rate(rate), current_tpt, sr,
5aa33553 2403 low, high, low_tpt, high_tpt);
4d30ee82 2404
4e4b815c
ES		 2405 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2406 current_tpt, low_tpt, high_tpt);
8ca151b5 2407
393b9e5b 2408 /* Force a search in case BT doesn't like us being in MIMO */
5aa33553 2409 if (is_mimo(rate) &&
393b9e5b 2410 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
4d30ee82
ES		 2411 IWL_DEBUG_RATE(mvm,
2412 "BT Coex forbids MIMO. Search for new config\n");
36946ce6
EG		 2413 rs_stay_in_table(lq_sta, true);
2414 goto lq_update;
2415 }
2416
8ca151b5 2417 switch (scale_action) {
4e4b815c 2418 case RS_ACTION_DOWNSCALE:
8ca151b5
JB		 2419 /* Decrease starting rate, update uCode's rate table */
2420 if (low != IWL_RATE_INVALID) {
2421 update_lq = 1;
2422 index = low;
4d30ee82
ES		 2423 } else {
2424 IWL_DEBUG_RATE(mvm,
2425 "At the bottom rate. Can't decrease\n");
8ca151b5
JB		 2426 }
2427
2428 break;
4e4b815c 2429 case RS_ACTION_UPSCALE:
8ca151b5
JB		 2430 /* Increase starting rate, update uCode's rate table */
2431 if (high != IWL_RATE_INVALID) {
2432 update_lq = 1;
2433 index = high;
4d30ee82
ES		 2434 } else {
2435 IWL_DEBUG_RATE(mvm,
2436 "At the top rate. Can't increase\n");
8ca151b5
JB		 2437 }
2438
2439 break;
4e4b815c 2440 case RS_ACTION_STAY:
8ca151b5 2441 /* No change */
e6c8d602
ES		 2442 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2443 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2fd647f8 2444 break;
8ca151b5
JB		 2445 default:
2446 break;
2447 }
2448
8ca151b5
JB		 2449lq_update:
2450 /* Replace uCode's rate table for the destination station. */
5aa33553
ES		 2451 if (update_lq) {
2452 tbl->rate.index = index;
1191f646
ES		 2453 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2454 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
04e3a5da 2455 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
7b9d74e4 2456 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
5aa33553 2457 }
8ca151b5
JB		 2458
2459 rs_stay_in_table(lq_sta, false);
2460
2461 /*
2462 * Search for new modulation mode if we're:
2463 * 1) Not changing rates right now
2464 * 2) Not just finishing up a search
2465 * 3) Allowing a new search
2466 */
2467 if (!update_lq && !done_search &&
b3b06a32
ES		 2468 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2469 && window->counter) {
2470 enum rs_column next_column;
2471
8ca151b5
JB		 2472 /* Save current throughput to compare with "search" throughput*/
2473 lq_sta->last_tpt = current_tpt;
2474
4d30ee82 2475 IWL_DEBUG_RATE(mvm,
b3b06a32
ES		 2476 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2477 update_lq, done_search, lq_sta->rs_state,
4d30ee82 2478 window->counter);
b3b06a32
ES		 2479
2480 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2481 if (next_column != RS_COLUMN_INVALID) {
2482 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2483 next_column);
2484 if (!ret)
2485 lq_sta->search_better_tbl = 1;
2486 } else {
2487 IWL_DEBUG_RATE(mvm,
2488 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2489 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2490 }
8ca151b5
JB		 2491
2492 /* If new "search" mode was selected, set up in uCode table */
2493 if (lq_sta->search_better_tbl) {
2494 /* Access the "search" table, clear its history. */
2495 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b804eeb6 2496 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 2497
2498 /* Use new "search" start rate */
8fc7c58c 2499 index = tbl->rate.index;
8ca151b5 2500
b3b06a32
ES		 2501 rs_dump_rate(mvm, &tbl->rate,
2502 "Switch to SEARCH TABLE:");
7b9d74e4 2503 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
8ca151b5
JB		 2504 } else {
2505 done_search = 1;
2506 }
2507 }
2508
b3b06a32 2509 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
8ca151b5
JB		 2510 /* If the "active" (non-search) mode was legacy,
2511 * and we've tried switching antennas,
2512 * but we haven't been able to try HT modes (not available),
2513 * stay with best antenna legacy modulation for a while
2514 * before next round of mode comparisons. */
2515 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
fd7dbee5 2516 if (is_legacy(&tbl1->rate)) {
8ca151b5 2517 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
fd7dbee5
ES		 2518
2519 if (tid != IWL_MAX_TID_COUNT) {
2520 tid_data = &sta_priv->tid_data[tid];
2521 if (tid_data->state != IWL_AGG_OFF) {
2522 IWL_DEBUG_RATE(mvm,
2523 "Stop aggregation on tid %d\n",
2524 tid);
2525 ieee80211_stop_tx_ba_session(sta, tid);
2526 }
2527 }
8ca151b5 2528 rs_set_stay_in_table(mvm, 1, lq_sta);
b3b06a32 2529 } else {
8ca151b5
JB		 2530 /* If we're in an HT mode, and all 3 mode switch actions
2531 * have been tried and compared, stay in this best modulation
2532 * mode for a while before next round of mode comparisons. */
8ca151b5
JB		 2533 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2534 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2535 (tid != IWL_MAX_TID_COUNT)) {
2536 tid_data = &sta_priv->tid_data[tid];
ff7a68d0 2537 if (tid_data->state == IWL_AGG_OFF && !ndp) {
8ca151b5
JB		 2538 IWL_DEBUG_RATE(mvm,
2539 "try to aggregate tid %d\n",
2540 tid);
2541 rs_tl_turn_on_agg(mvm, tid,
2542 lq_sta, sta);
2543 }
2544 }
2545 rs_set_stay_in_table(mvm, 0, lq_sta);
2546 }
2547 }
8ca151b5
JB		 2548}
2549
361dbec8
ES		 2550struct rs_init_rate_info {
2551 s8 rssi;
2552 u8 rate_idx;
2553};
2554
b503ed60 2555static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
361dbec8
ES		 2556 { -60, IWL_RATE_54M_INDEX },
2557 { -64, IWL_RATE_48M_INDEX },
2558 { -68, IWL_RATE_36M_INDEX },
2559 { -80, IWL_RATE_24M_INDEX },
2560 { -84, IWL_RATE_18M_INDEX },
2561 { -85, IWL_RATE_12M_INDEX },
2562 { -86, IWL_RATE_11M_INDEX },
2563 { -88, IWL_RATE_5M_INDEX },
2564 { -90, IWL_RATE_2M_INDEX },
2565 { S8_MIN, IWL_RATE_1M_INDEX },
2566};
2567
b503ed60 2568static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
361dbec8
ES		 2569 { -60, IWL_RATE_54M_INDEX },
2570 { -64, IWL_RATE_48M_INDEX },
2571 { -72, IWL_RATE_36M_INDEX },
2572 { -80, IWL_RATE_24M_INDEX },
2573 { -84, IWL_RATE_18M_INDEX },
2574 { -85, IWL_RATE_12M_INDEX },
2575 { -87, IWL_RATE_9M_INDEX },
2576 { S8_MIN, IWL_RATE_6M_INDEX },
2577};
2578
b503ed60
ES		 2579static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2580 { -60, IWL_RATE_MCS_7_INDEX },
2581 { -64, IWL_RATE_MCS_6_INDEX },
2582 { -68, IWL_RATE_MCS_5_INDEX },
2583 { -72, IWL_RATE_MCS_4_INDEX },
2584 { -80, IWL_RATE_MCS_3_INDEX },
2585 { -84, IWL_RATE_MCS_2_INDEX },
2586 { -85, IWL_RATE_MCS_1_INDEX },
2587 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2588};
2589
855f492f
GG		 2590/* MCS index 9 is not valid for 20MHz VHT channel width,
2591 * but is ok for 40, 80 and 160MHz channels.
2592 */
b503ed60
ES		 2593static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2594 { -60, IWL_RATE_MCS_8_INDEX },
2595 { -64, IWL_RATE_MCS_7_INDEX },
2596 { -68, IWL_RATE_MCS_6_INDEX },
2597 { -72, IWL_RATE_MCS_5_INDEX },
2598 { -80, IWL_RATE_MCS_4_INDEX },
2599 { -84, IWL_RATE_MCS_3_INDEX },
2600 { -85, IWL_RATE_MCS_2_INDEX },
2601 { -87, IWL_RATE_MCS_1_INDEX },
2602 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2603};
2604
855f492f 2605static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
b503ed60
ES		 2606 { -60, IWL_RATE_MCS_9_INDEX },
2607 { -64, IWL_RATE_MCS_8_INDEX },
2608 { -68, IWL_RATE_MCS_7_INDEX },
2609 { -72, IWL_RATE_MCS_6_INDEX },
2610 { -80, IWL_RATE_MCS_5_INDEX },
2611 { -84, IWL_RATE_MCS_4_INDEX },
2612 { -85, IWL_RATE_MCS_3_INDEX },
2613 { -87, IWL_RATE_MCS_2_INDEX },
2614 { -88, IWL_RATE_MCS_1_INDEX },
2615 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2616};
2617
99319b8c
GG		 2618#define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2619
b503ed60
ES		 2620/* Init the optimal rate based on STA caps
2621 * This combined with rssi is used to report the last tx rate
2622 * to userspace when we haven't transmitted enough frames.
2623 */
2624static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2625 struct ieee80211_sta *sta,
2626 struct iwl_lq_sta *lq_sta)
2627{
2628 struct rs_rate *rate = &lq_sta->optimal_rate;
2629
2630 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2631 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2632 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2633 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
57fbcce3 2634 else if (lq_sta->band == NL80211_BAND_5GHZ)
b503ed60
ES		 2635 rate->type = LQ_LEGACY_A;
2636 else
2637 rate->type = LQ_LEGACY_G;
2638
2639 rate->bw = rs_bw_from_sta_bw(sta);
2640 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2641
2642 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2643
2644 if (is_mimo(rate)) {
2645 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2646 } else if (is_siso(rate)) {
2647 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2648 } else {
2649 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2650
57fbcce3 2651 if (lq_sta->band == NL80211_BAND_5GHZ) {
b503ed60
ES		 2652 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2653 lq_sta->optimal_nentries =
2654 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2655 } else {
2656 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2657 lq_sta->optimal_nentries =
2658 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2659 }
2660 }
2661
2662 if (is_vht(rate)) {
2663 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2664 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2665 lq_sta->optimal_nentries =
2666 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2667 } else {
855f492f 2668 lq_sta->optimal_rates = rs_optimal_rates_vht;
b503ed60 2669 lq_sta->optimal_nentries =
855f492f 2670 ARRAY_SIZE(rs_optimal_rates_vht);
b503ed60
ES		 2671 }
2672 } else if (is_ht(rate)) {
2673 lq_sta->optimal_rates = rs_optimal_rates_ht;
2674 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2675 }
2676}
2677
2678/* Compute the optimal rate index based on RSSI */
2679static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2680 struct iwl_lq_sta *lq_sta)
2681{
2682 struct rs_rate *rate = &lq_sta->optimal_rate;
2683 int i;
2684
2685 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2686 BITS_PER_LONG);
2687
2688 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2689 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2690
2691 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2692 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2693 rate->index = rate_idx;
2694 break;
2695 }
2696 }
2697
b503ed60
ES		 2698 return rate;
2699}
2700
361dbec8
ES		 2701/* Choose an initial legacy rate and antenna to use based on the RSSI
2702 * of last Rx
2703 */
2704static void rs_get_initial_rate(struct iwl_mvm *mvm,
99319b8c 2705 struct ieee80211_sta *sta,
361dbec8 2706 struct iwl_lq_sta *lq_sta,
57fbcce3 2707 enum nl80211_band band,
361dbec8
ES		 2708 struct rs_rate *rate)
2709{
2710 int i, nentries;
99319b8c 2711 unsigned long active_rate;
361dbec8
ES		 2712 s8 best_rssi = S8_MIN;
2713 u8 best_ant = ANT_NONE;
a0544272 2714 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
361dbec8
ES		 2715 const struct rs_init_rate_info *initial_rates;
2716
2717 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2718 if (!(lq_sta->pers.chains & BIT(i)))
2719 continue;
2720
2721 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2722 best_rssi = lq_sta->pers.chain_signal[i];
2723 best_ant = BIT(i);
2724 }
2725 }
2726
2727 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2728 rs_pretty_ant(best_ant), best_rssi);
2729
2730 if (best_ant != ANT_A && best_ant != ANT_B)
2731 rate->ant = first_antenna(valid_tx_ant);
2732 else
2733 rate->ant = best_ant;
2734
2735 rate->sgi = false;
2736 rate->ldpc = false;
2737 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2738
2739 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2740 BITS_PER_LONG);
2741
57fbcce3 2742 if (band == NL80211_BAND_5GHZ) {
361dbec8 2743 rate->type = LQ_LEGACY_A;
b503ed60
ES		 2744 initial_rates = rs_optimal_rates_5ghz_legacy;
2745 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
361dbec8
ES		 2746 } else {
2747 rate->type = LQ_LEGACY_G;
b503ed60
ES		 2748 initial_rates = rs_optimal_rates_24ghz_legacy;
2749 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
361dbec8
ES		 2750 }
2751
99319b8c
GG		 2752 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2753 goto out;
2754
2755 /* Start from a higher rate if the corresponding debug capability
2756 * is enabled. The rate is chosen according to AP capabilities.
2757 * In case of VHT/HT when the rssi is low fallback to the case of
2758 * legacy rates.
2759 */
2760 if (sta->vht_cap.vht_supported &&
2761 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
855f492f
GG		 2762 switch (sta->bandwidth) {
2763 case IEEE80211_STA_RX_BW_160:
2764 case IEEE80211_STA_RX_BW_80:
2765 case IEEE80211_STA_RX_BW_40:
2766 initial_rates = rs_optimal_rates_vht;
2767 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2768 break;
2769 case IEEE80211_STA_RX_BW_20:
99319b8c
GG		 2770 initial_rates = rs_optimal_rates_vht_20mhz;
2771 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
855f492f
GG		 2772 break;
2773 default:
99319b8c
GG		 2774 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2775 goto out;
361dbec8 2776 }
855f492f 2777
99319b8c
GG		 2778 active_rate = lq_sta->active_siso_rate;
2779 rate->type = LQ_VHT_SISO;
855f492f 2780 rate->bw = rs_bw_from_sta_bw(sta);
99319b8c
GG		 2781 } else if (sta->ht_cap.ht_supported &&
2782 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2783 initial_rates = rs_optimal_rates_ht;
2784 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2785 active_rate = lq_sta->active_siso_rate;
2786 rate->type = LQ_HT_SISO;
2787 } else {
2788 active_rate = lq_sta->active_legacy_rate;
361dbec8
ES		 2789 }
2790
99319b8c
GG		 2791 for (i = 0; i < nentries; i++) {
2792 int rate_idx = initial_rates[i].rate_idx;
2793
2794 if ((best_rssi >= initial_rates[i].rssi) &&
2795 (BIT(rate_idx) & active_rate)) {
2796 rate->index = rate_idx;
2797 break;
2798 }
2799 }
2800
2801out:
2802 rs_dump_rate(mvm, rate, "INITIAL");
361dbec8
ES		 2803}
2804
2805/* Save info about RSSI of last Rx */
2806void rs_update_last_rssi(struct iwl_mvm *mvm,
2807 struct iwl_lq_sta *lq_sta,
2808 struct ieee80211_rx_status *rx_status)
2809{
b503ed60
ES		 2810 int i;
2811
361dbec8
ES		 2812 lq_sta->pers.chains = rx_status->chains;
2813 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2814 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2815 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
b503ed60
ES		 2816 lq_sta->pers.last_rssi = S8_MIN;
2817
2818 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2819 if (!(lq_sta->pers.chains & BIT(i)))
2820 continue;
2821
2822 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2823 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2824 }
361dbec8
ES		 2825}
2826
8ca151b5
JB		 2827/**
2828 * rs_initialize_lq - Initialize a station's hardware rate table
2829 *
2830 * The uCode's station table contains a table of fallback rates
2831 * for automatic fallback during transmission.
2832 *
2833 * NOTE: This sets up a default set of values. These will be replaced later
2834 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2835 * rc80211_simple.
2836 *
2837 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2838 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2839 * which requires station table entry to exist).
2840 */
2841static void rs_initialize_lq(struct iwl_mvm *mvm,
2842 struct ieee80211_sta *sta,
2843 struct iwl_lq_sta *lq_sta,
57fbcce3 2844 enum nl80211_band band,
b87c2179 2845 bool init)
8ca151b5
JB		 2846{
2847 struct iwl_scale_tbl_info *tbl;
5aa33553 2848 struct rs_rate *rate;
8ca151b5 2849 u8 active_tbl = 0;
8ca151b5
JB		 2850
2851 if (!sta || !lq_sta)
2852 return;
2853
8ca151b5
JB		 2854 if (!lq_sta->search_better_tbl)
2855 active_tbl = lq_sta->active_tbl;
2856 else
2857 active_tbl = 1 - lq_sta->active_tbl;
2858
2859 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2860 rate = &tbl->rate;
8ca151b5 2861
99319b8c 2862 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
b503ed60 2863 rs_init_optimal_rate(mvm, sta, lq_sta);
8ca151b5 2864
b3b06a32 2865 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
99319b8c 2866 tbl->column = rs_get_column_from_rate(rate);
b3b06a32 2867
8ca151b5 2868 rs_set_expected_tpt_table(lq_sta, tbl);
80e9e5cd 2869 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
8ca151b5 2870 /* TODO restore station should remember the lq cmd */
b87c2179 2871 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
8ca151b5
JB		 2872}
2873
2874static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2875 struct ieee80211_tx_rate_control *txrc)
2876{
2877 struct sk_buff *skb = txrc->skb;
8ca151b5
JB		 2878 struct iwl_op_mode *op_mode __maybe_unused =
2879 (struct iwl_op_mode *)mvm_r;
2880 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2881 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2882 struct iwl_lq_sta *lq_sta = mvm_sta;
b503ed60
ES		 2883 struct rs_rate *optimal_rate;
2884 u32 last_ucode_rate;
8ca151b5 2885
dcbc17ad
JB		 2886 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2887 /* if vif isn't initialized mvm doesn't know about
2888 * this station, so don't do anything with the it
2889 */
2890 sta = NULL;
2891 mvm_sta = NULL;
2892 }
2893
2536e7c3 2894 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2895
2896 /* Treat uninitialized rate scaling data same as non-existing. */
ae969afe 2897 if (lq_sta && !lq_sta->pers.drv) {
8ca151b5
JB		 2898 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2899 mvm_sta = NULL;
2900 }
2901
2902 /* Send management frames and NO_ACK data using lowest rate. */
2903 if (rate_control_send_low(sta, mvm_sta, txrc))
2904 return;
2905
d310e405
ES		 2906 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2907 info->band, &info->control.rates[0]);
622ebe99 2908 info->control.rates[0].count = 1;
b503ed60
ES		 2909
2910 /* Report the optimal rate based on rssi and STA caps if we haven't
2911 * converged yet (too little traffic) or exploring other modulations
2912 */
2913 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2914 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2915 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2916 optimal_rate);
2917 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2918 &txrc->reported_rate);
2919 }
8ca151b5
JB		 2920}
2921
2922static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2923 gfp_t gfp)
2924{
9d8ce6af 2925 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
ae969afe
EP		 2926 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2927 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2928 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
8ca151b5
JB		 2929
2930 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2931
ae969afe
EP		 2932 lq_sta->pers.drv = mvm;
2933#ifdef CONFIG_MAC80211_DEBUGFS
2934 lq_sta->pers.dbg_fixed_rate = 0;
2935 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
878985ce 2936 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
ae969afe 2937#endif
361dbec8
ES		 2938 lq_sta->pers.chains = 0;
2939 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
b503ed60 2940 lq_sta->pers.last_rssi = S8_MIN;
ae969afe 2941
8ca151b5
JB		 2942 return &sta_priv->lq_sta;
2943}
2944
d310e405
ES		 2945static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2946 int nss)
2947{
2948 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2949 (0x3 << (2 * (nss - 1)));
2950 rx_mcs >>= (2 * (nss - 1));
2951
2952 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2953 return IWL_RATE_MCS_7_INDEX;
2954 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2955 return IWL_RATE_MCS_8_INDEX;
2956 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2957 return IWL_RATE_MCS_9_INDEX;
2958
2959 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2960 return -1;
2961}
2962
750a1b45
ES		 2963static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2964 struct ieee80211_sta_vht_cap *vht_cap,
2965 struct iwl_lq_sta *lq_sta)
2966{
2967 int i;
2968 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2969
2970 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2971 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2972 if (i == IWL_RATE_9M_INDEX)
2973 continue;
2974
271518ad
ES		 2975 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2976 if (i == IWL_RATE_MCS_9_INDEX &&
2977 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2978 continue;
2979
750a1b45
ES		 2980 lq_sta->active_siso_rate |= BIT(i);
2981 }
2982 }
2983
ecc90e79
ES		 2984 if (sta->rx_nss < 2)
2985 return;
2986
750a1b45
ES		 2987 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2988 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2989 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2990 if (i == IWL_RATE_9M_INDEX)
2991 continue;
2992
271518ad
ES		 2993 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2994 if (i == IWL_RATE_MCS_9_INDEX &&
2995 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2996 continue;
2997
750a1b45
ES		 2998 lq_sta->active_mimo2_rate |= BIT(i);
2999 }
3000 }
3001}
3002
2f15a829
JB		 3003static void rs_ht_init(struct iwl_mvm *mvm,
3004 struct ieee80211_sta *sta,
3005 struct iwl_lq_sta *lq_sta,
3006 struct ieee80211_sta_ht_cap *ht_cap)
3007{
3008 /* active_siso_rate mask includes 9 MBits (bit 5),
3009 * and CCK (bits 0-3), supp_rates[] does not;
3010 * shift to convert format, force 9 MBits off.
3011 */
3012 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3013 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3014 lq_sta->active_siso_rate &= ~((u16)0x2);
3015 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3016
3017 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3018 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3019 lq_sta->active_mimo2_rate &= ~((u16)0x2);
3020 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3021
3022 if (mvm->cfg->ht_params->ldpc &&
3023 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3024 lq_sta->ldpc = true;
3025
3026 if (mvm->cfg->ht_params->stbc &&
3027 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3028 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3d44eebf 3029 lq_sta->stbc_capable = true;
2f15a829
JB		 3030
3031 lq_sta->is_vht = false;
3032}
3033
3034static void rs_vht_init(struct iwl_mvm *mvm,
3035 struct ieee80211_sta *sta,
3036 struct iwl_lq_sta *lq_sta,
3037 struct ieee80211_sta_vht_cap *vht_cap)
3038{
3039 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3040
3041 if (mvm->cfg->ht_params->ldpc &&
3042 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3043 lq_sta->ldpc = true;
3044
3045 if (mvm->cfg->ht_params->stbc &&
3046 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3047 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3d44eebf
ES		 3048 lq_sta->stbc_capable = true;
3049
859d914c 3050 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3d44eebf
ES		 3051 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3052 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3053 lq_sta->bfer_capable = true;
2f15a829
JB		 3054
3055 lq_sta->is_vht = true;
3056}
3057
5fc0f76c 3058#ifdef CONFIG_IWLWIFI_DEBUGFS
2f15a829 3059static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
5fc0f76c
ES		 3060{
3061 spin_lock_bh(&mvm->drv_stats_lock);
2f15a829 3062 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
5fc0f76c
ES		 3063 spin_unlock_bh(&mvm->drv_stats_lock);
3064}
3065
2f15a829 3066void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
5fc0f76c 3067{
9d504435 3068 u8 nss = 0;
5fc0f76c
ES		 3069
3070 spin_lock(&mvm->drv_stats_lock);
3071
3072 if (agg)
2f15a829 3073 mvm->drv_rx_stats.agg_frames++;
5fc0f76c 3074
2f15a829 3075 mvm->drv_rx_stats.success_frames++;
5fc0f76c
ES		 3076
3077 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3078 case RATE_MCS_CHAN_WIDTH_20:
2f15a829 3079 mvm->drv_rx_stats.bw_20_frames++;
5fc0f76c
ES		 3080 break;
3081 case RATE_MCS_CHAN_WIDTH_40:
2f15a829 3082 mvm->drv_rx_stats.bw_40_frames++;
5fc0f76c
ES		 3083 break;
3084 case RATE_MCS_CHAN_WIDTH_80:
2f15a829 3085 mvm->drv_rx_stats.bw_80_frames++;
5fc0f76c 3086 break;
855f492f
GG		 3087 case RATE_MCS_CHAN_WIDTH_160:
3088 mvm->drv_rx_stats.bw_160_frames++;
3089 break;
5fc0f76c
ES		 3090 default:
3091 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3092 }
3093
3094 if (rate & RATE_MCS_HT_MSK) {
2f15a829 3095 mvm->drv_rx_stats.ht_frames++;
5fc0f76c
ES		 3096 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3097 } else if (rate & RATE_MCS_VHT_MSK) {
2f15a829 3098 mvm->drv_rx_stats.vht_frames++;
5fc0f76c
ES		 3099 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3100 RATE_VHT_MCS_NSS_POS) + 1;
3101 } else {
2f15a829 3102 mvm->drv_rx_stats.legacy_frames++;
5fc0f76c
ES		 3103 }
3104
3105 if (nss == 1)
2f15a829 3106 mvm->drv_rx_stats.siso_frames++;
5fc0f76c 3107 else if (nss == 2)
2f15a829 3108 mvm->drv_rx_stats.mimo2_frames++;
5fc0f76c
ES		 3109
3110 if (rate & RATE_MCS_SGI_MSK)
2f15a829 3111 mvm->drv_rx_stats.sgi_frames++;
5fc0f76c 3112 else
2f15a829 3113 mvm->drv_rx_stats.ngi_frames++;
5fc0f76c 3114
2f15a829
JB		 3115 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3116 mvm->drv_rx_stats.last_frame_idx =
3117 (mvm->drv_rx_stats.last_frame_idx + 1) %
3118 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
5fc0f76c
ES		 3119
3120 spin_unlock(&mvm->drv_stats_lock);
3121}
3122#endif
3123
8ca151b5
JB		 3124/*
3125 * Called after adding a new station to initialize rate scaling
3126 */
3127void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
57fbcce3 3128 enum nl80211_band band, bool init)
8ca151b5
JB		 3129{
3130 int i, j;
3131 struct ieee80211_hw *hw = mvm->hw;
3132 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
d310e405 3133 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
9d8ce6af
JB		 3134 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3135 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
8ca151b5
JB		 3136 struct ieee80211_supported_band *sband;
3137 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3138
ae969afe
EP		 3139 /* clear all non-persistent lq data */
3140 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
b87c2179 3141
8ca151b5
JB		 3142 sband = hw->wiphy->bands[band];
3143
3144 lq_sta->lq.sta_id = sta_priv->sta_id;
04e3a5da 3145 sta_priv->tlc_amsdu = false;
8ca151b5
JB		 3146
3147 for (j = 0; j < LQ_SIZE; j++)
b804eeb6 3148 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
8ca151b5
JB		 3149
3150 lq_sta->flush_timer = 0;
87d5e415 3151 lq_sta->last_tx = jiffies;
8ca151b5
JB		 3152
3153 IWL_DEBUG_RATE(mvm,
3154 "LQ: *** rate scale station global init for station %d ***\n",
3155 sta_priv->sta_id);
3156 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3157 * the lowest or the highest rate.. Could consider using RSSI from
3158 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3159 * after assoc.. */
3160
834437da 3161 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
8ca151b5
JB		 3162 lq_sta->band = sband->band;
3163 /*
3164 * active legacy rates as per supported rates bitmap
3165 */
3166 supp = sta->supp_rates[sband->band];
3167 lq_sta->active_legacy_rate = 0;
3168 for_each_set_bit(i, &supp, BITS_PER_LONG)
3169 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3170
d310e405 3171 /* TODO: should probably account for rx_highest for both HT/VHT */
2c59d80c
ES		 3172 if (!vht_cap || !vht_cap->vht_supported)
3173 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3174 else
3175 rs_vht_init(mvm, sta, lq_sta, vht_cap);
8ca151b5 3176
6a028d9a
ES		 3177 lq_sta->max_legacy_rate_idx =
3178 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3179 lq_sta->max_siso_rate_idx =
3180 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3181 lq_sta->max_mimo2_rate_idx =
3182 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
198266a3 3183
a3576ff2 3184 IWL_DEBUG_RATE(mvm,
3d44eebf 3185 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
198266a3 3186 lq_sta->active_legacy_rate,
8ca151b5 3187 lq_sta->active_siso_rate,
d310e405 3188 lq_sta->active_mimo2_rate,
3d44eebf
ES		 3189 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3190 lq_sta->bfer_capable);
198266a3
ES		 3191 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3192 lq_sta->max_legacy_rate_idx,
3193 lq_sta->max_siso_rate_idx,
3194 lq_sta->max_mimo2_rate_idx);
8ca151b5
JB		 3195
3196 /* These values will be overridden later */
3197 lq_sta->lq.single_stream_ant_msk =
a0544272 3198 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
809bccfa 3199 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
8ca151b5
JB		 3200
3201 /* as default allow aggregation for all tids */
3202 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
8ca151b5 3203 lq_sta->is_agg = 0;
5fc0f76c 3204#ifdef CONFIG_IWLWIFI_DEBUGFS
2f15a829 3205 iwl_mvm_reset_frame_stats(mvm);
5fc0f76c 3206#endif
b87c2179
ES		 3207 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3208}
3209
3210static void rs_rate_update(void *mvm_r,
3211 struct ieee80211_supported_band *sband,
3212 struct cfg80211_chan_def *chandef,
3213 struct ieee80211_sta *sta, void *priv_sta,
3214 u32 changed)
3215{
3216 u8 tid;
3217 struct iwl_op_mode *op_mode =
3218 (struct iwl_op_mode *)mvm_r;
3219 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3220
dcbc17ad
JB		 3221 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3222 return;
3223
b87c2179
ES		 3224 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3225 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3226 ieee80211_stop_tx_ba_session(sta, tid);
3227
3228 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
8ca151b5
JB		 3229}
3230
8fc7c58c
ES		 3231#ifdef CONFIG_MAC80211_DEBUGFS
3232static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3233 struct iwl_lq_cmd *lq_cmd,
57fbcce3 3234 enum nl80211_band band,
8fc7c58c
ES		 3235 u32 ucode_rate)
3236{
3237 struct rs_rate rate;
3238 int i;
3239 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3240 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
7ceb98a3 3241 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
8fc7c58c
ES		 3242
3243 for (i = 0; i < num_rates; i++)
3244 lq_cmd->rs_table[i] = ucode_rate_le32;
3245
3246 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3247
3248 if (is_mimo(&rate))
3249 lq_cmd->mimo_delim = num_rates - 1;
3250 else
3251 lq_cmd->mimo_delim = 0;
7ceb98a3
EG		 3252
3253 lq_cmd->reduced_tpc = 0;
3254
3255 if (num_of_ant(ant) == 1)
3256 lq_cmd->single_stream_ant_msk = ant;
3257
3258 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
8fc7c58c
ES		 3259}
3260#endif /* CONFIG_MAC80211_DEBUGFS */
3261
e07be6d3
ES		 3262static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3263 struct iwl_lq_sta *lq_sta,
3264 struct rs_rate *rate,
3265 __le32 *rs_table, int *rs_table_index,
3266 int num_rates, int num_retries,
3267 u8 valid_tx_ant, bool toggle_ant)
3268{
3269 int i, j;
3270 __le32 ucode_rate;
3271 bool bottom_reached = false;
3272 int prev_rate_idx = rate->index;
3273 int end = LINK_QUAL_MAX_RETRY_NUM;
3274 int index = *rs_table_index;
3275
3276 for (i = 0; i < num_rates && index < end; i++) {
bd999318
ES		 3277 for (j = 0; j < num_retries && index < end; j++, index++) {
3278 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3279 rate));
e07be6d3 3280 rs_table[index] = ucode_rate;
bd999318
ES		 3281 if (toggle_ant)
3282 rs_toggle_antenna(valid_tx_ant, rate);
3283 }
e07be6d3
ES		 3284
3285 prev_rate_idx = rate->index;
3286 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3287 if (bottom_reached && !is_legacy(rate))
3288 break;
3289 }
3290
bd999318 3291 if (!bottom_reached && !is_legacy(rate))
e07be6d3
ES		 3292 rate->index = prev_rate_idx;
3293
3294 *rs_table_index = index;
3295}
3296
3297/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3298 * column the rate table should look like this:
3299 *
3300 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3301 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3302 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3303 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3304 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3305 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3306 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3307 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3308 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3309 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3310 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3311 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3312 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3313 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3314 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3315 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3316 */
8fc7c58c 3317static void rs_build_rates_table(struct iwl_mvm *mvm,
d8bafeaf 3318 struct ieee80211_sta *sta,
8fc7c58c
ES		 3319 struct iwl_lq_sta *lq_sta,
3320 const struct rs_rate *initial_rate)
8ca151b5 3321{
5aa33553 3322 struct rs_rate rate;
e07be6d3 3323 int num_rates, num_retries, index = 0;
8ca151b5
JB		 3324 u8 valid_tx_ant = 0;
3325 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
e07be6d3 3326 bool toggle_ant = false;
8ca151b5 3327
9e898f1b 3328 memcpy(&rate, initial_rate, sizeof(rate));
8fc7c58c 3329
a0544272 3330 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
c5d679a5 3331
3d44eebf 3332 /* TODO: remove old API when min FW API hits 14 */
859d914c 3333 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3d44eebf
ES		 3334 rs_stbc_allow(mvm, sta, lq_sta))
3335 rate.stbc = true;
8ca151b5 3336
e07be6d3 3337 if (is_siso(&rate)) {
834437da
ES		 3338 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3339 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
e07be6d3 3340 } else if (is_mimo(&rate)) {
834437da
ES		 3341 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3342 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
8ca151b5 3343 } else {
834437da 3344 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
bd999318 3345 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
e07be6d3 3346 toggle_ant = true;
8ca151b5
JB		 3347 }
3348
e07be6d3
ES		 3349 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3350 num_rates, num_retries, valid_tx_ant,
3351 toggle_ant);
8ca151b5 3352
e07be6d3 3353 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 3354
e07be6d3 3355 if (is_siso(&rate)) {
834437da
ES		 3356 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3357 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
d9088f60 3358 lq_cmd->mimo_delim = index;
e07be6d3 3359 } else if (is_legacy(&rate)) {
834437da 3360 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
bd999318 3361 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
e07be6d3
ES		 3362 } else {
3363 WARN_ON_ONCE(1);
3364 }
8ca151b5 3365
e07be6d3 3366 toggle_ant = true;
8ca151b5 3367
e07be6d3
ES		 3368 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3369 num_rates, num_retries, valid_tx_ant,
3370 toggle_ant);
8ca151b5 3371
e07be6d3 3372 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 3373
834437da 3374 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
bd999318 3375 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
8ca151b5 3376
e07be6d3
ES		 3377 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3378 num_rates, num_retries, valid_tx_ant,
3379 toggle_ant);
8ca151b5 3380
8fc7c58c
ES		 3381}
3382
3d44eebf
ES		 3383struct rs_bfer_active_iter_data {
3384 struct ieee80211_sta *exclude_sta;
3385 struct iwl_mvm_sta *bfer_mvmsta;
3386};
3387
3388static void rs_bfer_active_iter(void *_data,
3389 struct ieee80211_sta *sta)
3390{
3391 struct rs_bfer_active_iter_data *data = _data;
3392 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3393 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3394 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3395
3396 if (sta == data->exclude_sta)
3397 return;
3398
3399 /* The current sta has BFER allowed */
3400 if (ss_params & LQ_SS_BFER_ALLOWED) {
3401 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3402
3403 data->bfer_mvmsta = mvmsta;
3404 }
3405}
3406
3407static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3408{
3409 int prio = -1;
3410 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3411
3412 switch (viftype) {
3413 case NL80211_IFTYPE_AP:
3414 case NL80211_IFTYPE_P2P_GO:
3415 prio = 3;
3416 break;
3417 case NL80211_IFTYPE_P2P_CLIENT:
3418 prio = 2;
3419 break;
3420 case NL80211_IFTYPE_STATION:
3421 prio = 1;
3422 break;
3423 default:
3424 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3425 prio = -1;
3426 }
3427
3428 return prio;
3429}
3430
3431/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3432static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3433 struct iwl_mvm_sta *sta2)
3434{
3435 int prio1 = rs_bfer_priority(sta1);
3436 int prio2 = rs_bfer_priority(sta2);
3437
3438 if (prio1 > prio2)
3439 return 1;
3440 if (prio1 < prio2)
3441 return -1;
3442 return 0;
3443}
3444
3445static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3446 struct ieee80211_sta *sta,
3447 struct iwl_lq_sta *lq_sta,
3448 const struct rs_rate *initial_rate)
3449{
3450 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3451 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3452 struct rs_bfer_active_iter_data data = {
3453 .exclude_sta = sta,
3454 .bfer_mvmsta = NULL,
3455 };
3456 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3457 u32 ss_params = LQ_SS_PARAMS_VALID;
3458
3459 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3460 goto out;
3461
878985ce 3462#ifdef CONFIG_MAC80211_DEBUGFS
1e9c62fa
ES		 3463 /* Check if forcing the decision is configured.
3464 * Note that SISO is forced by not allowing STBC or BFER
3465 */
878985ce 3466 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
1e9c62fa 3467 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
878985ce 3468 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
1e9c62fa
ES		 3469 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3470
878985ce 3471 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
1e9c62fa 3472 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
878985ce 3473 lq_sta->pers.ss_force);
1e9c62fa
ES		 3474 goto out;
3475 }
878985ce 3476#endif
1e9c62fa 3477
3d44eebf
ES		 3478 if (lq_sta->stbc_capable)
3479 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3480
3481 if (!lq_sta->bfer_capable)
3482 goto out;
3483
3484 ieee80211_iterate_stations_atomic(mvm->hw,
3485 rs_bfer_active_iter,
3486 &data);
3487 bfer_mvmsta = data.bfer_mvmsta;
3488
3489 /* This code is safe as it doesn't run concurrently for different
3490 * stations. This is guaranteed by the fact that calls to
3491 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3492 */
3493 if (!bfer_mvmsta) {
3494 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3495
3496 ss_params |= LQ_SS_BFER_ALLOWED;
3497 goto out;
3498 }
3499
3500 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3501 bfer_mvmsta->sta_id);
3502
3503 /* Disallow BFER on another STA if active and we're a higher priority */
3504 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3505 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3506 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3507
3508 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3509 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3510 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3511
3512 ss_params |= LQ_SS_BFER_ALLOWED;
3513 IWL_DEBUG_RATE(mvm,
3514 "Lower priority BFER sta found (%d). Switch BFER\n",
3515 bfer_mvmsta->sta_id);
3516 }
3517out:
3518 lq_cmd->ss_params = cpu_to_le32(ss_params);
3519}
3520
8fc7c58c
ES		 3521static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3522 struct ieee80211_sta *sta,
3523 struct iwl_lq_sta *lq_sta,
3524 const struct rs_rate *initial_rate)
3525{
3526 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
7ceb98a3
EG		 3527 struct iwl_mvm_sta *mvmsta;
3528 struct iwl_mvm_vif *mvmvif;
3529
834437da 3530 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
7ceb98a3 3531 lq_cmd->agg_time_limit =
834437da 3532 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
8fc7c58c
ES		 3533
3534#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 3535 if (lq_sta->pers.dbg_fixed_rate) {
8fc7c58c
ES		 3536 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3537 lq_sta->band,
ae969afe 3538 lq_sta->pers.dbg_fixed_rate);
7ceb98a3
EG		 3539 return;
3540 }
8fc7c58c 3541#endif
7ceb98a3
EG		 3542 if (WARN_ON_ONCE(!sta || !initial_rate))
3543 return;
8fc7c58c 3544
d8bafeaf 3545 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
8ca151b5 3546
859d914c 3547 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3d44eebf
ES		 3548 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3549
7ceb98a3
EG		 3550 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3551 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
e96d551f 3552
7ceb98a3
EG		 3553 if (num_of_ant(initial_rate->ant) == 1)
3554 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3555
3556 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3557
3558 /*
0d365ae5 3559 * In case of low latency, tell the firmware to leave a frame in the
7ceb98a3
EG		 3560 * Tx Fifo so that it can start a transaction in the same TxOP. This
3561 * basically allows the firmware to send bursts.
3562 */
1412ee39 3563 if (iwl_mvm_vif_low_latency(mvmvif))
7ceb98a3
EG		 3564 lq_cmd->agg_frame_cnt_limit--;
3565
a4db848f
EG		 3566 if (mvmsta->vif->p2p)
3567 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3568
7ceb98a3 3569 lq_cmd->agg_time_limit =
5b7ff615 3570 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
8ca151b5
JB		 3571}
3572
3573static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3574{
3575 return hw->priv;
3576}
3577/* rate scale requires free function to be implemented */
3578static void rs_free(void *mvm_rate)
3579{
3580 return;
3581}
3582
3583static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3584 void *mvm_sta)
3585{
3586 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3587 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3588
3589 IWL_DEBUG_RATE(mvm, "enter\n");
3590 IWL_DEBUG_RATE(mvm, "leave\n");
3591}
3592
3593#ifdef CONFIG_MAC80211_DEBUGFS
5fc0f76c 3594int rs_pretty_print_rate(char *buf, const u32 rate)
5aa33553
ES		 3595{
3596
1a61b347
ES		 3597 char *type, *bw;
3598 u8 mcs = 0, nss = 0;
3599 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3600
3601 if (!(rate & RATE_MCS_HT_MSK) &&
3602 !(rate & RATE_MCS_VHT_MSK)) {
3603 int index = iwl_hwrate_to_plcp_idx(rate);
3604
3605 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
560843f4
ES		 3606 rs_pretty_ant(ant),
3607 index == IWL_RATE_INVALID ? "BAD" :
3608 iwl_rate_mcs[index].mbps);
1a61b347
ES		 3609 }
3610
3611 if (rate & RATE_MCS_VHT_MSK) {
3612 type = "VHT";
3613 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3614 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3615 >> RATE_VHT_MCS_NSS_POS) + 1;
3616 } else if (rate & RATE_MCS_HT_MSK) {
3617 type = "HT";
3618 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3374c3ab
GG		 3619 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3620 >> RATE_HT_MCS_NSS_POS) + 1;
1a61b347
ES		 3621 } else {
3622 type = "Unknown"; /* shouldn't happen */
3623 }
3624
3625 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3626 case RATE_MCS_CHAN_WIDTH_20:
3627 bw = "20Mhz";
3628 break;
3629 case RATE_MCS_CHAN_WIDTH_40:
3630 bw = "40Mhz";
3631 break;
3632 case RATE_MCS_CHAN_WIDTH_80:
3633 bw = "80Mhz";
3634 break;
3635 case RATE_MCS_CHAN_WIDTH_160:
3636 bw = "160Mhz";
3637 break;
3638 default:
3639 bw = "BAD BW";
3640 }
3641
3642 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
5aa33553 3643 type, rs_pretty_ant(ant), bw, mcs, nss,
1a61b347 3644 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
7b1dd048 3645 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
1a61b347
ES		 3646 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3647 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3648 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3649}
3650
a0c38b21
ES		 3651/**
3652 * Program the device to use fixed rate for frame transmit
3653 * This is for debugging/testing only
3654 * once the device start use fixed rate, we need to reload the module
3655 * to being back the normal operation.
3656 */
3657static void rs_program_fix_rate(struct iwl_mvm *mvm,
3658 struct iwl_lq_sta *lq_sta)
3659{
3660 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3661 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3662 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3663
3664 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
ae969afe 3665 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
a0c38b21 3666
ae969afe 3667 if (lq_sta->pers.dbg_fixed_rate) {
7ceb98a3 3668 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
ae969afe 3669 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
a0c38b21
ES		 3670 }
3671}
3672
9d10849e
EG		 3673static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3674 const char __user *user_buf, size_t count, loff_t *ppos)
3675{
3676 struct iwl_lq_sta *lq_sta = file->private_data;
3677 struct iwl_mvm *mvm;
3678 char buf[64];
3679 size_t buf_size;
3680 u32 parsed_rate;
3681
ae969afe 3682 mvm = lq_sta->pers.drv;
9d10849e
EG		 3683 memset(buf, 0, sizeof(buf));
3684 buf_size = min(count, sizeof(buf) - 1);
3685 if (copy_from_user(buf, user_buf, buf_size))
3686 return -EFAULT;
3687
3688 if (sscanf(buf, "%x", &parsed_rate) == 1)
ae969afe 3689 lq_sta->pers.dbg_fixed_rate = parsed_rate;
9d10849e 3690 else
ae969afe 3691 lq_sta->pers.dbg_fixed_rate = 0;
9d10849e
EG		 3692
3693 rs_program_fix_rate(mvm, lq_sta);
3694
3695 return count;
3696}
3697
8ca151b5
JB		 3698static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3699 char __user *user_buf, size_t count, loff_t *ppos)
3700{
3701 char *buff;
3702 int desc = 0;
3703 int i = 0;
8ca151b5
JB		 3704 ssize_t ret;
3705
3706 struct iwl_lq_sta *lq_sta = file->private_data;
04e3a5da
EG		 3707 struct iwl_mvm_sta *mvmsta =
3708 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
8ca151b5
JB		 3709 struct iwl_mvm *mvm;
3710 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 3711 struct rs_rate *rate = &tbl->rate;
16c426ff 3712 u32 ss_params;
04e3a5da 3713
ae969afe 3714 mvm = lq_sta->pers.drv;
1a61b347 3715 buff = kmalloc(2048, GFP_KERNEL);
8ca151b5
JB		 3716 if (!buff)
3717 return -ENOMEM;
3718
3719 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
198266a3 3720 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
8ca151b5
JB		 3721 lq_sta->total_failed, lq_sta->total_success,
3722 lq_sta->active_legacy_rate);
3723 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
ae969afe 3724 lq_sta->pers.dbg_fixed_rate);
8ca151b5 3725 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
a0544272
MH		 3726 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3727 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3728 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
8ca151b5 3729 desc += sprintf(buff+desc, "lq type %s\n",
5aa33553
ES		 3730 (is_legacy(rate)) ? "legacy" :
3731 is_vht(rate) ? "VHT" : "HT");
3732 if (!is_legacy(rate)) {
e70fe7eb 3733 desc += sprintf(buff + desc, " %s",
5aa33553 3734 (is_siso(rate)) ? "SISO" : "MIMO2");
e70fe7eb
EG		 3735 desc += sprintf(buff + desc, " %s",
3736 (is_ht20(rate)) ? "20MHz" :
3737 (is_ht40(rate)) ? "40MHz" :
855f492f
GG		 3738 (is_ht80(rate)) ? "80MHz" :
3739 (is_ht160(rate)) ? "160MHz" : "BAD BW");
04e3a5da 3740 desc += sprintf(buff + desc, " %s %s %s %s\n",
e70fe7eb
EG		 3741 (rate->sgi) ? "SGI" : "NGI",
3742 (rate->ldpc) ? "LDPC" : "BCC",
04e3a5da
EG		 3743 (lq_sta->is_agg) ? "AGG on" : "",
3744 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
8ca151b5
JB		 3745 }
3746 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3747 lq_sta->last_rate_n_flags);
3748 desc += sprintf(buff+desc,
1a61b347 3749 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
8ca151b5
JB		 3750 lq_sta->lq.flags,
3751 lq_sta->lq.mimo_delim,
3752 lq_sta->lq.single_stream_ant_msk,
3753 lq_sta->lq.dual_stream_ant_msk);
3754
3755 desc += sprintf(buff+desc,
3756 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3757 le16_to_cpu(lq_sta->lq.agg_time_limit),
3758 lq_sta->lq.agg_disable_start_th,
3759 lq_sta->lq.agg_frame_cnt_limit);
3760
2fd647f8 3761 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
16c426ff
ES		 3762 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3763 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3764 (ss_params & LQ_SS_PARAMS_VALID) ?
db7c689d 3765 "VALID" : "INVALID",
16c426ff 3766 (ss_params & LQ_SS_BFER_ALLOWED) ?
db7c689d 3767 ", BFER" : "",
16c426ff 3768 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
db7c689d 3769 ", STBC" : "",
16c426ff 3770 (ss_params & LQ_SS_FORCE) ?
db7c689d 3771 ", FORCE" : "");
8ca151b5
JB		 3772 desc += sprintf(buff+desc,
3773 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3774 lq_sta->lq.initial_rate_index[0],
3775 lq_sta->lq.initial_rate_index[1],
3776 lq_sta->lq.initial_rate_index[2],
3777 lq_sta->lq.initial_rate_index[3]);
3778
3779 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
cf4ef654 3780 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
1a61b347 3781
cf4ef654
JB		 3782 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3783 desc += rs_pretty_print_rate(buff+desc, r);
8ca151b5
JB		 3784 }
3785
3786 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3787 kfree(buff);
3788 return ret;
3789}
3790
3791static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3792 .write = rs_sta_dbgfs_scale_table_write,
3793 .read = rs_sta_dbgfs_scale_table_read,
3794 .open = simple_open,
3795 .llseek = default_llseek,
3796};
3797static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3798 char __user *user_buf, size_t count, loff_t *ppos)
3799{
3800 char *buff;
3801 int desc = 0;
3802 int i, j;
3803 ssize_t ret;
d310e405 3804 struct iwl_scale_tbl_info *tbl;
5aa33553 3805 struct rs_rate *rate;
8ca151b5
JB		 3806 struct iwl_lq_sta *lq_sta = file->private_data;
3807
3808 buff = kmalloc(1024, GFP_KERNEL);
3809 if (!buff)
3810 return -ENOMEM;
3811
3812 for (i = 0; i < LQ_SIZE; i++) {
d310e405 3813 tbl = &(lq_sta->lq_info[i]);
5aa33553 3814 rate = &tbl->rate;
8ca151b5 3815 desc += sprintf(buff+desc,
6a524f48 3816 "%s type=%d SGI=%d BW=%s DUP=0\n"
8fc7c58c 3817 "index=%d\n",
8ca151b5 3818 lq_sta->active_tbl == i ? "*" : "x",
5aa33553
ES		 3819 rate->type,
3820 rate->sgi,
855f492f
GG		 3821 is_ht20(rate) ? "20MHz" :
3822 is_ht40(rate) ? "40MHz" :
3823 is_ht80(rate) ? "80MHz" :
3824 is_ht160(rate) ? "160MHz" : "ERR",
8fc7c58c 3825 rate->index);
8ca151b5
JB		 3826 for (j = 0; j < IWL_RATE_COUNT; j++) {
3827 desc += sprintf(buff+desc,
3828 "counter=%d success=%d %%=%d\n",
d310e405
ES		 3829 tbl->win[j].counter,
3830 tbl->win[j].success_counter,
3831 tbl->win[j].success_ratio);
8ca151b5
JB		 3832 }
3833 }
3834 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3835 kfree(buff);
3836 return ret;
3837}
3838
3839static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3840 .read = rs_sta_dbgfs_stats_table_read,
3841 .open = simple_open,
3842 .llseek = default_llseek,
3843};
3844
757cf23b
ES		 3845static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3846 char __user *user_buf,
3847 size_t count, loff_t *ppos)
3848{
3849 static const char * const column_name[] = {
3850 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3851 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3852 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3853 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3854 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3855 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3856 [RS_COLUMN_MIMO2] = "MIMO2",
3857 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3858 };
3859
3860 static const char * const rate_name[] = {
3861 [IWL_RATE_1M_INDEX] = "1M",
3862 [IWL_RATE_2M_INDEX] = "2M",
3863 [IWL_RATE_5M_INDEX] = "5.5M",
3864 [IWL_RATE_11M_INDEX] = "11M",
3865 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3866 [IWL_RATE_9M_INDEX] = "9M",
3867 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3868 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3869 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3870 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3871 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3872 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3873 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3874 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3875 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3876 };
3877
3878 char *buff, *pos, *endpos;
3879 int col, rate;
3880 ssize_t ret;
3881 struct iwl_lq_sta *lq_sta = file->private_data;
3882 struct rs_rate_stats *stats;
3883 static const size_t bufsz = 1024;
3884
3885 buff = kmalloc(bufsz, GFP_KERNEL);
3886 if (!buff)
3887 return -ENOMEM;
3888
3889 pos = buff;
3890 endpos = pos + bufsz;
3891
3892 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3893 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3894 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3895 pos += scnprintf(pos, endpos - pos, "\n");
3896
3897 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3898 pos += scnprintf(pos, endpos - pos,
3899 "%s,", column_name[col]);
3900
3901 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
f58220f6 3902 stats = &(lq_sta->pers.tx_stats[col][rate]);
757cf23b
ES		 3903 pos += scnprintf(pos, endpos - pos,
3904 "%llu/%llu,",
3905 stats->success,
3906 stats->total);
3907 }
3908 pos += scnprintf(pos, endpos - pos, "\n");
3909 }
3910
3911 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3912 kfree(buff);
3913 return ret;
3914}
3915
3916static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3917 const char __user *user_buf,
3918 size_t count, loff_t *ppos)
3919{
3920 struct iwl_lq_sta *lq_sta = file->private_data;
f58220f6 3921 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
757cf23b
ES		 3922
3923 return count;
3924}
3925
3926static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3927 .read = rs_sta_dbgfs_drv_tx_stats_read,
3928 .write = rs_sta_dbgfs_drv_tx_stats_write,
3929 .open = simple_open,
3930 .llseek = default_llseek,
3931};
3932
1e9c62fa
ES		 3933static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3934 char __user *user_buf,
3935 size_t count, loff_t *ppos)
3936{
3937 struct iwl_lq_sta *lq_sta = file->private_data;
3938 char buf[12];
3939 int bufsz = sizeof(buf);
3940 int pos = 0;
3941 static const char * const ss_force_name[] = {
3942 [RS_SS_FORCE_NONE] = "none",
3943 [RS_SS_FORCE_STBC] = "stbc",
3944 [RS_SS_FORCE_BFER] = "bfer",
3945 [RS_SS_FORCE_SISO] = "siso",
3946 };
3947
3948 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
878985ce 3949 ss_force_name[lq_sta->pers.ss_force]);
1e9c62fa
ES		 3950 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3951}
3952
3953static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3954 size_t count, loff_t *ppos)
3955{
3956 struct iwl_mvm *mvm = lq_sta->pers.drv;
3957 int ret = 0;
3958
3959 if (!strncmp("none", buf, 4)) {
878985ce 3960 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
1e9c62fa 3961 } else if (!strncmp("siso", buf, 4)) {
878985ce 3962 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
1e9c62fa
ES		 3963 } else if (!strncmp("stbc", buf, 4)) {
3964 if (lq_sta->stbc_capable) {
878985ce 3965 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
1e9c62fa
ES		 3966 } else {
3967 IWL_ERR(mvm,
3968 "can't force STBC. peer doesn't support\n");
3969 ret = -EINVAL;
3970 }
3971 } else if (!strncmp("bfer", buf, 4)) {
3972 if (lq_sta->bfer_capable) {
878985ce 3973 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
1e9c62fa
ES		 3974 } else {
3975 IWL_ERR(mvm,
3976 "can't force BFER. peer doesn't support\n");
3977 ret = -EINVAL;
3978 }
3979 } else {
3980 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3981 ret = -EINVAL;
3982 }
3983 return ret ?: count;
3984}
3985
3986#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3987 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3988#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3989 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3990 &iwl_dbgfs_##name##_ops)) \
3991 goto err; \
3992 } while (0)
3993
3994MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3995
dcbc17ad 3996static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
8ca151b5 3997{
dcbc17ad
JB		 3998 struct iwl_lq_sta *lq_sta = priv_sta;
3999 struct iwl_mvm_sta *mvmsta;
4000
4001 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
4002
4003 if (!mvmsta->vif)
4004 return;
1e9c62fa 4005
c6e1faad
EP		 4006 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
4007 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4008 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
4009 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4010 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
4011 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4012 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
4013 &lq_sta->tx_agg_tid_en);
4014 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4015 &lq_sta->pers.dbg_fixed_txp_reduction);
1e9c62fa
ES		 4016
4017 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4018 return;
4019err:
4020 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
8ca151b5
JB		 4021}
4022
4023static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4024{
8ca151b5
JB		 4025}
4026#endif
4027
4028/*
4029 * Initialization of rate scaling information is done by driver after
4030 * the station is added. Since mac80211 calls this function before a
4031 * station is added we ignore it.
4032 */
4033static void rs_rate_init_stub(void *mvm_r,
3de805cf
SW		 4034 struct ieee80211_supported_band *sband,
4035 struct cfg80211_chan_def *chandef,
4036 struct ieee80211_sta *sta, void *mvm_sta)
8ca151b5
JB		 4037{
4038}
631ad703
JB		 4039
4040static const struct rate_control_ops rs_mvm_ops = {
8ca151b5 4041 .name = RS_NAME,
1ebc8f2e 4042 .tx_status = rs_mac80211_tx_status,
8ca151b5
JB		 4043 .get_rate = rs_get_rate,
4044 .rate_init = rs_rate_init_stub,
4045 .alloc = rs_alloc,
4046 .free = rs_free,
4047 .alloc_sta = rs_alloc_sta,
4048 .free_sta = rs_free_sta,
b87c2179 4049 .rate_update = rs_rate_update,
8ca151b5
JB		 4050#ifdef CONFIG_MAC80211_DEBUGFS
4051 .add_sta_debugfs = rs_add_debugfs,
4052 .remove_sta_debugfs = rs_remove_debugfs,
4053#endif
4054};
4055
4056int iwl_mvm_rate_control_register(void)
4057{
4058 return ieee80211_rate_control_register(&rs_mvm_ops);
4059}
4060
4061void iwl_mvm_rate_control_unregister(void)
4062{
4063 ieee80211_rate_control_unregister(&rs_mvm_ops);
4064}
9ee718aa
EL		 4065
4066/**
4067 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
0d365ae5 4068 * Tx protection, according to this request and previous requests,
9ee718aa 4069 * and send the LQ command.
9ee718aa
EL		 4070 * @mvmsta: The station
4071 * @enable: Enable Tx protection?
4072 */
e126b5d9
JB		 4073int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4074 bool enable)
9ee718aa 4075{
e126b5d9
JB		 4076 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4077
9ee718aa
EL		 4078 lockdep_assert_held(&mvm->mutex);
4079
4080 if (enable) {
4081 if (mvmsta->tx_protection == 0)
d307ec8d 4082 lq->flags |= LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 4083 mvmsta->tx_protection++;
4084 } else {
4085 mvmsta->tx_protection--;
4086 if (mvmsta->tx_protection == 0)
d307ec8d 4087 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 4088 }
4089
9e680946 4090 return iwl_mvm_send_lq_cmd(mvm, lq, false);
9ee718aa 4091}
Ubuntu Artful kernel mirror