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iwlwifi: mvm: don't return uninitialized value in get_survey()
[linux-block.git] / drivers / net / wireless / iwlwifi / mvm / rs.c
CommitLineData
8ca151b5
JB		 1/******************************************************************************
2 *
51368bf7 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
8b4139dc 4 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
8ca151b5
JB		 5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 *
19 * The full GNU General Public License is included in this distribution in the
20 * file called LICENSE.
21 *
22 * Contact Information:
23 * Intel Linux Wireless <ilw@linux.intel.com>
24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *
26 *****************************************************************************/
27#include <linux/kernel.h>
8ca151b5
JB		 28#include <linux/skbuff.h>
29#include <linux/slab.h>
30#include <net/mac80211.h>
31
32#include <linux/netdevice.h>
33#include <linux/etherdevice.h>
34#include <linux/delay.h>
35
36#include <linux/workqueue.h>
37#include "rs.h"
38#include "fw-api.h"
39#include "sta.h"
40#include "iwl-op-mode.h"
41#include "mvm.h"
1e9c62fa 42#include "debugfs.h"
8ca151b5
JB		 43
44#define RS_NAME "iwl-mvm-rs"
45
8ca151b5 46#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
8ca151b5 47
834437da
ES		 48/* Calculations of success ratio are done in fixed point where 12800 is 100%.
49 * Use this macro when dealing with thresholds consts set as a percentage
50 */
51#define RS_PERCENT(x) (128 * x)
8ca151b5
JB		 52
53static u8 rs_ht_to_legacy[] = {
da87d7d5
ES		 54 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
55 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
56 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
57 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
58 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
59 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
60 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
61 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
8ca151b5
JB		 64};
65
66static const u8 ant_toggle_lookup[] = {
ef4394b9
EP		 67 [ANT_NONE] = ANT_NONE,
68 [ANT_A] = ANT_B,
69 [ANT_B] = ANT_C,
70 [ANT_AB] = ANT_BC,
71 [ANT_C] = ANT_A,
72 [ANT_AC] = ANT_AB,
73 [ANT_BC] = ANT_AC,
74 [ANT_ABC] = ANT_ABC,
8ca151b5
JB		 75};
76
d310e405
ES		 77#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
83 IWL_RATE_##rp##M_INDEX, \
ab055ce9 84 IWL_RATE_##rn##M_INDEX }
8ca151b5 85
d310e405
ES		 86#define IWL_DECLARE_MCS_RATE(s) \
87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_INVM_INDEX, \
93 IWL_RATE_INVM_INDEX }
94
8ca151b5
JB		 95/*
96 * Parameter order:
ab055ce9 97 * rate, ht rate, prev rate, next rate
8ca151b5
JB		 98 *
99 * If there isn't a valid next or previous rate then INV is used which
100 * maps to IWL_RATE_INVALID
101 *
102 */
103static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
ab055ce9
ES		 104 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
105 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
106 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
107 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
d310e405
ES		 108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
109 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
8ca151b5
JB		 119};
120
4e4b815c
ES		 121enum rs_action {
122 RS_ACTION_STAY = 0,
123 RS_ACTION_DOWNSCALE = -1,
124 RS_ACTION_UPSCALE = 1,
125};
126
b3b06a32
ES		 127enum rs_column_mode {
128 RS_INVALID = 0,
129 RS_LEGACY,
130 RS_SISO,
131 RS_MIMO2,
132};
133
fd7dbee5 134#define MAX_NEXT_COLUMNS 7
b3b06a32
ES		 135#define MAX_COLUMN_CHECKS 3
136
0b8d17f3
ES		 137struct rs_tx_column;
138
b3b06a32
ES		 139typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
140 struct ieee80211_sta *sta,
0b8d17f3
ES		 141 struct iwl_scale_tbl_info *tbl,
142 const struct rs_tx_column *next_col);
b3b06a32
ES		 143
144struct rs_tx_column {
145 enum rs_column_mode mode;
146 u8 ant;
147 bool sgi;
148 enum rs_column next_columns[MAX_NEXT_COLUMNS];
149 allow_column_func_t checks[MAX_COLUMN_CHECKS];
150};
151
219fb66b 152static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
0b8d17f3
ES		 153 struct iwl_scale_tbl_info *tbl,
154 const struct rs_tx_column *next_col)
219fb66b 155{
0b8d17f3 156 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
219fb66b
EG		 157}
158
b3b06a32 159static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
0b8d17f3
ES		 160 struct iwl_scale_tbl_info *tbl,
161 const struct rs_tx_column *next_col)
b3b06a32 162{
7ac4a50a
ES		 163 struct iwl_mvm_sta *mvmsta;
164 struct iwl_mvm_vif *mvmvif;
165
b3b06a32
ES		 166 if (!sta->ht_cap.ht_supported)
167 return false;
168
169 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
170 return false;
171
a0544272 172 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
b3b06a32
ES		 173 return false;
174
175 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
176 return false;
177
7ac4a50a
ES		 178 mvmsta = iwl_mvm_sta_from_mac80211(sta);
179 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
180 if (iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p)
181 return false;
182
b3b06a32
ES		 183 return true;
184}
185
186static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
0b8d17f3
ES		 187 struct iwl_scale_tbl_info *tbl,
188 const struct rs_tx_column *next_col)
b3b06a32
ES		 189{
190 if (!sta->ht_cap.ht_supported)
191 return false;
192
193 return true;
194}
195
196static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
0b8d17f3
ES		 197 struct iwl_scale_tbl_info *tbl,
198 const struct rs_tx_column *next_col)
b3b06a32
ES		 199{
200 struct rs_rate *rate = &tbl->rate;
201 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
202 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
203
204 if (is_ht20(rate) && (ht_cap->cap &
205 IEEE80211_HT_CAP_SGI_20))
206 return true;
207 if (is_ht40(rate) && (ht_cap->cap &
208 IEEE80211_HT_CAP_SGI_40))
209 return true;
210 if (is_ht80(rate) && (vht_cap->cap &
211 IEEE80211_VHT_CAP_SHORT_GI_80))
212 return true;
213
214 return false;
215}
216
217static const struct rs_tx_column rs_tx_columns[] = {
218 [RS_COLUMN_LEGACY_ANT_A] = {
219 .mode = RS_LEGACY,
220 .ant = ANT_A,
221 .next_columns = {
222 RS_COLUMN_LEGACY_ANT_B,
223 RS_COLUMN_SISO_ANT_A,
31b20452 224 RS_COLUMN_MIMO2,
d8fff919
ES		 225 RS_COLUMN_INVALID,
226 RS_COLUMN_INVALID,
fd7dbee5
ES		 227 RS_COLUMN_INVALID,
228 RS_COLUMN_INVALID,
b3b06a32 229 },
219fb66b
EG		 230 .checks = {
231 rs_ant_allow,
232 },
b3b06a32
ES		 233 },
234 [RS_COLUMN_LEGACY_ANT_B] = {
235 .mode = RS_LEGACY,
236 .ant = ANT_B,
237 .next_columns = {
238 RS_COLUMN_LEGACY_ANT_A,
239 RS_COLUMN_SISO_ANT_B,
31b20452 240 RS_COLUMN_MIMO2,
d8fff919
ES		 241 RS_COLUMN_INVALID,
242 RS_COLUMN_INVALID,
fd7dbee5
ES		 243 RS_COLUMN_INVALID,
244 RS_COLUMN_INVALID,
b3b06a32 245 },
219fb66b
EG		 246 .checks = {
247 rs_ant_allow,
248 },
b3b06a32
ES		 249 },
250 [RS_COLUMN_SISO_ANT_A] = {
251 .mode = RS_SISO,
252 .ant = ANT_A,
253 .next_columns = {
254 RS_COLUMN_SISO_ANT_B,
255 RS_COLUMN_MIMO2,
256 RS_COLUMN_SISO_ANT_A_SGI,
fd7dbee5
ES		 257 RS_COLUMN_LEGACY_ANT_A,
258 RS_COLUMN_LEGACY_ANT_B,
d8fff919 259 RS_COLUMN_INVALID,
31b20452 260 RS_COLUMN_INVALID,
b3b06a32
ES		 261 },
262 .checks = {
263 rs_siso_allow,
219fb66b 264 rs_ant_allow,
b3b06a32
ES		 265 },
266 },
267 [RS_COLUMN_SISO_ANT_B] = {
268 .mode = RS_SISO,
269 .ant = ANT_B,
270 .next_columns = {
271 RS_COLUMN_SISO_ANT_A,
272 RS_COLUMN_MIMO2,
273 RS_COLUMN_SISO_ANT_B_SGI,
fd7dbee5
ES		 274 RS_COLUMN_LEGACY_ANT_A,
275 RS_COLUMN_LEGACY_ANT_B,
d8fff919 276 RS_COLUMN_INVALID,
31b20452 277 RS_COLUMN_INVALID,
b3b06a32
ES		 278 },
279 .checks = {
280 rs_siso_allow,
219fb66b 281 rs_ant_allow,
b3b06a32
ES		 282 },
283 },
284 [RS_COLUMN_SISO_ANT_A_SGI] = {
285 .mode = RS_SISO,
286 .ant = ANT_A,
287 .sgi = true,
288 .next_columns = {
289 RS_COLUMN_SISO_ANT_B_SGI,
290 RS_COLUMN_MIMO2_SGI,
291 RS_COLUMN_SISO_ANT_A,
fd7dbee5
ES		 292 RS_COLUMN_LEGACY_ANT_A,
293 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 294 RS_COLUMN_INVALID,
295 RS_COLUMN_INVALID,
b3b06a32
ES		 296 },
297 .checks = {
298 rs_siso_allow,
219fb66b 299 rs_ant_allow,
b3b06a32
ES		 300 rs_sgi_allow,
301 },
302 },
303 [RS_COLUMN_SISO_ANT_B_SGI] = {
304 .mode = RS_SISO,
305 .ant = ANT_B,
306 .sgi = true,
307 .next_columns = {
308 RS_COLUMN_SISO_ANT_A_SGI,
309 RS_COLUMN_MIMO2_SGI,
310 RS_COLUMN_SISO_ANT_B,
fd7dbee5
ES		 311 RS_COLUMN_LEGACY_ANT_A,
312 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 313 RS_COLUMN_INVALID,
314 RS_COLUMN_INVALID,
b3b06a32
ES		 315 },
316 .checks = {
317 rs_siso_allow,
219fb66b 318 rs_ant_allow,
b3b06a32
ES		 319 rs_sgi_allow,
320 },
321 },
322 [RS_COLUMN_MIMO2] = {
323 .mode = RS_MIMO2,
324 .ant = ANT_AB,
325 .next_columns = {
326 RS_COLUMN_SISO_ANT_A,
327 RS_COLUMN_MIMO2_SGI,
fd7dbee5
ES		 328 RS_COLUMN_LEGACY_ANT_A,
329 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 330 RS_COLUMN_INVALID,
331 RS_COLUMN_INVALID,
332 RS_COLUMN_INVALID,
b3b06a32
ES		 333 },
334 .checks = {
335 rs_mimo_allow,
336 },
337 },
338 [RS_COLUMN_MIMO2_SGI] = {
339 .mode = RS_MIMO2,
340 .ant = ANT_AB,
341 .sgi = true,
342 .next_columns = {
343 RS_COLUMN_SISO_ANT_A_SGI,
344 RS_COLUMN_MIMO2,
fd7dbee5
ES		 345 RS_COLUMN_LEGACY_ANT_A,
346 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 347 RS_COLUMN_INVALID,
348 RS_COLUMN_INVALID,
349 RS_COLUMN_INVALID,
b3b06a32
ES		 350 },
351 .checks = {
352 rs_mimo_allow,
353 rs_sgi_allow,
354 },
355 },
356};
357
8ca151b5
JB		 358static inline u8 rs_extract_rate(u32 rate_n_flags)
359{
360 /* also works for HT because bits 7:6 are zero there */
361 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
362}
363
364static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
365{
366 int idx = 0;
367
8ca151b5 368 if (rate_n_flags & RATE_MCS_HT_MSK) {
d310e405
ES		 369 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
370 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 371
d310e405 372 /* skip 9M not supported in HT*/
8ca151b5
JB		 373 if (idx >= IWL_RATE_9M_INDEX)
374 idx += 1;
4e82dd3a 375 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
8ca151b5 376 return idx;
d310e405
ES		 377 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
378 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
379 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 380
d310e405
ES		 381 /* skip 9M not supported in VHT*/
382 if (idx >= IWL_RATE_9M_INDEX)
383 idx++;
384 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
385 return idx;
8ca151b5 386 } else {
d310e405
ES		 387 /* legacy rate format, search for match in table */
388
389 u8 legacy_rate = rs_extract_rate(rate_n_flags);
8ca151b5 390 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
d310e405 391 if (iwl_rates[idx].plcp == legacy_rate)
8ca151b5
JB		 392 return idx;
393 }
394
560843f4 395 return IWL_RATE_INVALID;
8ca151b5
JB		 396}
397
398static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1ebc8f2e
ES		 399 struct ieee80211_sta *sta,
400 struct iwl_lq_sta *lq_sta,
401 int tid);
8fc7c58c
ES		 402static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
403 struct ieee80211_sta *sta,
404 struct iwl_lq_sta *lq_sta,
405 const struct rs_rate *initial_rate);
8ca151b5 406static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
8ca151b5 407
8ca151b5
JB		 408/**
409 * The following tables contain the expected throughput metrics for all rates
410 *
411 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
412 *
413 * where invalid entries are zeros.
414 *
415 * CCK rates are only valid in legacy table and will only be used in G
416 * (2.4 GHz) band.
417 */
418
a34529e8 419static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
4e82dd3a 420 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
8ca151b5
JB		 421};
422
4e82dd3a
ES		 423/* Expected TpT tables. 4 indexes:
424 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
425 */
a34529e8 426static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 427 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
428 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
429 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
430 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
8ca151b5
JB		 431};
432
a34529e8 433static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 434 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
435 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
436 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
437 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
8ca151b5
JB		 438};
439
a34529e8 440static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 441 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
442 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
443 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
444 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
445};
446
a34529e8 447static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 448 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
449 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
450 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
451 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
8ca151b5
JB		 452};
453
a34529e8 454static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 455 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
456 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
457 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
458 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
8ca151b5
JB		 459};
460
a34529e8 461static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 462 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
463 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
464 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
465 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
466};
467
8ca151b5
JB		 468/* mbps, mcs */
469static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
470 { "1", "BPSK DSSS"},
471 { "2", "QPSK DSSS"},
472 {"5.5", "BPSK CCK"},
473 { "11", "QPSK CCK"},
474 { "6", "BPSK 1/2"},
475 { "9", "BPSK 1/2"},
476 { "12", "QPSK 1/2"},
477 { "18", "QPSK 3/4"},
478 { "24", "16QAM 1/2"},
479 { "36", "16QAM 3/4"},
480 { "48", "64QAM 2/3"},
481 { "54", "64QAM 3/4"},
482 { "60", "64QAM 5/6"},
483};
484
485#define MCS_INDEX_PER_STREAM (8)
486
9d10849e
EG		 487static const char *rs_pretty_ant(u8 ant)
488{
489 static const char * const ant_name[] = {
490 [ANT_NONE] = "None",
491 [ANT_A] = "A",
492 [ANT_B] = "B",
493 [ANT_AB] = "AB",
494 [ANT_C] = "C",
495 [ANT_AC] = "AC",
496 [ANT_BC] = "BC",
497 [ANT_ABC] = "ABC",
498 };
499
500 if (ant > ANT_ABC)
501 return "UNKNOWN";
502
503 return ant_name[ant];
504}
505
506static const char *rs_pretty_lq_type(enum iwl_table_type type)
507{
508 static const char * const lq_types[] = {
509 [LQ_NONE] = "NONE",
510 [LQ_LEGACY_A] = "LEGACY_A",
511 [LQ_LEGACY_G] = "LEGACY_G",
512 [LQ_HT_SISO] = "HT SISO",
513 [LQ_HT_MIMO2] = "HT MIMO",
514 [LQ_VHT_SISO] = "VHT SISO",
515 [LQ_VHT_MIMO2] = "VHT MIMO",
516 };
517
518 if (type < LQ_NONE || type >= LQ_MAX)
519 return "UNKNOWN";
520
521 return lq_types[type];
522}
523
5aa33553
ES		 524static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
525 const char *prefix)
526{
d8bafeaf 527 IWL_DEBUG_RATE(mvm,
26a2cc01 528 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
5aa33553
ES		 529 prefix, rs_pretty_lq_type(rate->type),
530 rate->index, rs_pretty_ant(rate->ant),
d8bafeaf 531 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
5aa33553
ES		 532}
533
8ca151b5
JB		 534static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
535{
536 window->data = 0;
537 window->success_counter = 0;
538 window->success_ratio = IWL_INVALID_VALUE;
539 window->counter = 0;
540 window->average_tpt = IWL_INVALID_VALUE;
8ca151b5
JB		 541}
542
b804eeb6
ES		 543static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
544 struct iwl_scale_tbl_info *tbl)
3ca71f60
EP		 545{
546 int i;
547
b804eeb6 548 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
3ca71f60
EP		 549 for (i = 0; i < IWL_RATE_COUNT; i++)
550 rs_rate_scale_clear_window(&tbl->win[i]);
2fd647f8
EP		 551
552 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
553 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
3ca71f60
EP		 554}
555
8ca151b5
JB		 556static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
557{
558 return (ant_type & valid_antenna) == ant_type;
559}
560
8ca151b5
JB		 561static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
562 struct iwl_lq_sta *lq_data, u8 tid,
563 struct ieee80211_sta *sta)
564{
565 int ret = -EAGAIN;
8ca151b5 566
44cc429c
EG		 567 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
568 sta->addr, tid);
569 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
570 if (ret == -EAGAIN) {
571 /*
572 * driver and mac80211 is out of sync
573 * this might be cause by reloading firmware
574 * stop the tx ba session here
575 */
576 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
577 tid);
578 ieee80211_stop_tx_ba_session(sta, tid);
8ca151b5
JB		 579 }
580 return ret;
581}
582
583static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
584 struct iwl_lq_sta *lq_data,
585 struct ieee80211_sta *sta)
586{
587 if (tid < IWL_MAX_TID_COUNT)
588 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
589 else
590 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
591 tid, IWL_MAX_TID_COUNT);
592}
593
594static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
595{
596 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
597 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
598 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
599}
600
601/*
602 * Static function to get the expected throughput from an iwl_scale_tbl_info
603 * that wraps a NULL pointer check
604 */
605static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
606{
607 if (tbl->expected_tpt)
608 return tbl->expected_tpt[rs_index];
609 return 0;
610}
611
612/**
613 * rs_collect_tx_data - Update the success/failure sliding window
614 *
615 * We keep a sliding window of the last 62 packets transmitted
616 * at this rate. window->data contains the bitmask of successful
617 * packets.
618 */
834437da
ES		 619static int _rs_collect_tx_data(struct iwl_mvm *mvm,
620 struct iwl_scale_tbl_info *tbl,
0bd3c5a7
EP		 621 int scale_index, int attempts, int successes,
622 struct iwl_rate_scale_data *window)
8ca151b5 623{
8ca151b5
JB		 624 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
625 s32 fail_count, tpt;
626
8ca151b5
JB		 627 /* Get expected throughput */
628 tpt = get_expected_tpt(tbl, scale_index);
629
630 /*
631 * Keep track of only the latest 62 tx frame attempts in this rate's
632 * history window; anything older isn't really relevant any more.
633 * If we have filled up the sliding window, drop the oldest attempt;
634 * if the oldest attempt (highest bit in bitmap) shows "success",
635 * subtract "1" from the success counter (this is the main reason
636 * we keep these bitmaps!).
637 */
638 while (attempts > 0) {
639 if (window->counter >= IWL_RATE_MAX_WINDOW) {
640 /* remove earliest */
641 window->counter = IWL_RATE_MAX_WINDOW - 1;
642
643 if (window->data & mask) {
644 window->data &= ~mask;
645 window->success_counter--;
646 }
647 }
648
649 /* Increment frames-attempted counter */
650 window->counter++;
651
652 /* Shift bitmap by one frame to throw away oldest history */
653 window->data <<= 1;
654
655 /* Mark the most recent #successes attempts as successful */
656 if (successes > 0) {
657 window->success_counter++;
658 window->data |= 0x1;
659 successes--;
660 }
661
662 attempts--;
663 }
664
665 /* Calculate current success ratio, avoid divide-by-0! */
666 if (window->counter > 0)
667 window->success_ratio = 128 * (100 * window->success_counter)
668 / window->counter;
669 else
670 window->success_ratio = IWL_INVALID_VALUE;
671
672 fail_count = window->counter - window->success_counter;
673
674 /* Calculate average throughput, if we have enough history. */
834437da
ES		 675 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
676 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
8ca151b5
JB		 677 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
678 else
679 window->average_tpt = IWL_INVALID_VALUE;
680
8ca151b5
JB		 681 return 0;
682}
683
834437da
ES		 684static int rs_collect_tx_data(struct iwl_mvm *mvm,
685 struct iwl_lq_sta *lq_sta,
757cf23b 686 struct iwl_scale_tbl_info *tbl,
2fd647f8
EP		 687 int scale_index, int attempts, int successes,
688 u8 reduced_txp)
0bd3c5a7
EP		 689{
690 struct iwl_rate_scale_data *window = NULL;
2fd647f8 691 int ret;
0bd3c5a7
EP		 692
693 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
694 return -EINVAL;
695
757cf23b 696 if (tbl->column != RS_COLUMN_INVALID) {
f58220f6
ES		 697 struct lq_sta_pers *pers = &lq_sta->pers;
698
699 pers->tx_stats[tbl->column][scale_index].total += attempts;
700 pers->tx_stats[tbl->column][scale_index].success += successes;
757cf23b
ES		 701 }
702
0bd3c5a7
EP		 703 /* Select window for current tx bit rate */
704 window = &(tbl->win[scale_index]);
705
834437da 706 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
2fd647f8
EP		 707 window);
708 if (ret)
709 return ret;
710
711 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
712 return -EINVAL;
713
714 window = &tbl->tpc_win[reduced_txp];
834437da 715 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
0bd3c5a7
EP		 716 window);
717}
718
5aa33553
ES		 719/* Convert rs_rate object into ucode rate bitmask */
720static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
8fc7c58c 721 struct rs_rate *rate)
8ca151b5 722{
5aa33553
ES		 723 u32 ucode_rate = 0;
724 int index = rate->index;
8ca151b5 725
5aa33553 726 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
d310e405
ES		 727 RATE_MCS_ANT_ABC_MSK);
728
5aa33553
ES		 729 if (is_legacy(rate)) {
730 ucode_rate |= iwl_rates[index].plcp;
8ca151b5 731 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
5aa33553
ES		 732 ucode_rate |= RATE_MCS_CCK_MSK;
733 return ucode_rate;
d310e405
ES		 734 }
735
5aa33553 736 if (is_ht(rate)) {
d310e405 737 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
8ca151b5 738 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
4e82dd3a 739 index = IWL_LAST_HT_RATE;
8ca151b5 740 }
5aa33553 741 ucode_rate |= RATE_MCS_HT_MSK;
8ca151b5 742
5aa33553
ES		 743 if (is_ht_siso(rate))
744 ucode_rate |= iwl_rates[index].plcp_ht_siso;
745 else if (is_ht_mimo2(rate))
746 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
8ca151b5 747 else
d972ab31 748 WARN_ON_ONCE(1);
5aa33553 749 } else if (is_vht(rate)) {
d310e405
ES		 750 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
751 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
752 index = IWL_LAST_VHT_RATE;
753 }
5aa33553
ES		 754 ucode_rate |= RATE_MCS_VHT_MSK;
755 if (is_vht_siso(rate))
756 ucode_rate |= iwl_rates[index].plcp_vht_siso;
757 else if (is_vht_mimo2(rate))
758 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
d310e405
ES		 759 else
760 WARN_ON_ONCE(1);
761
8ca151b5 762 } else {
5aa33553 763 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
8ca151b5
JB		 764 }
765
d8bafeaf
ES		 766 if (is_siso(rate) && rate->stbc) {
767 /* To enable STBC we need to set both a flag and ANT_AB */
768 ucode_rate |= RATE_MCS_ANT_AB_MSK;
769 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
770 }
771
5aa33553
ES		 772 ucode_rate |= rate->bw;
773 if (rate->sgi)
774 ucode_rate |= RATE_MCS_SGI_MSK;
a3576ff2
ES		 775 if (rate->ldpc)
776 ucode_rate |= RATE_MCS_LDPC_MSK;
d310e405 777
5aa33553 778 return ucode_rate;
8ca151b5
JB		 779}
780
5aa33553
ES		 781/* Convert a ucode rate into an rs_rate object */
782static int rs_rate_from_ucode_rate(const u32 ucode_rate,
783 enum ieee80211_band band,
784 struct rs_rate *rate)
8ca151b5 785{
5aa33553
ES		 786 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
787 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
d310e405 788 u8 nss;
8ca151b5 789
9e898f1b 790 memset(rate, 0, sizeof(*rate));
5aa33553 791 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
8ca151b5 792
560843f4 793 if (rate->index == IWL_RATE_INVALID)
8ca151b5 794 return -EINVAL;
5aa33553
ES		 795
796 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
8ca151b5 797
d310e405 798 /* Legacy */
5aa33553
ES		 799 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
800 !(ucode_rate & RATE_MCS_VHT_MSK)) {
8ca151b5
JB		 801 if (num_of_ant == 1) {
802 if (band == IEEE80211_BAND_5GHZ)
5aa33553 803 rate->type = LQ_LEGACY_A;
8ca151b5 804 else
5aa33553 805 rate->type = LQ_LEGACY_G;
8ca151b5 806 }
d310e405
ES		 807
808 return 0;
809 }
810
811 /* HT or VHT */
5aa33553
ES		 812 if (ucode_rate & RATE_MCS_SGI_MSK)
813 rate->sgi = true;
a3576ff2
ES		 814 if (ucode_rate & RATE_MCS_LDPC_MSK)
815 rate->ldpc = true;
d8bafeaf
ES		 816 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
817 rate->stbc = true;
ba69d0e3
ES		 818 if (ucode_rate & RATE_MCS_BF_MSK)
819 rate->bfer = true;
d310e405 820
5aa33553 821 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
d310e405 822
5aa33553
ES		 823 if (ucode_rate & RATE_MCS_HT_MSK) {
824 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
d310e405
ES		 825 RATE_HT_MCS_NSS_POS) + 1;
826
827 if (nss == 1) {
5aa33553 828 rate->type = LQ_HT_SISO;
ba69d0e3
ES		 829 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
830 "stbc %d bfer %d",
831 rate->stbc, rate->bfer);
d310e405 832 } else if (nss == 2) {
5aa33553 833 rate->type = LQ_HT_MIMO2;
d310e405 834 WARN_ON_ONCE(num_of_ant != 2);
8ca151b5 835 } else {
d310e405
ES		 836 WARN_ON_ONCE(1);
837 }
5aa33553
ES		 838 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
839 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
d310e405
ES		 840 RATE_VHT_MCS_NSS_POS) + 1;
841
842 if (nss == 1) {
5aa33553 843 rate->type = LQ_VHT_SISO;
ba69d0e3
ES		 844 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
845 "stbc %d bfer %d",
846 rate->stbc, rate->bfer);
d310e405 847 } else if (nss == 2) {
5aa33553 848 rate->type = LQ_VHT_MIMO2;
d310e405
ES		 849 WARN_ON_ONCE(num_of_ant != 2);
850 } else {
851 WARN_ON_ONCE(1);
8ca151b5
JB		 852 }
853 }
d310e405 854
5aa33553
ES		 855 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
856 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
857 !is_vht(rate));
d310e405 858
8ca151b5
JB		 859 return 0;
860}
861
862/* switch to another antenna/antennas and return 1 */
863/* if no other valid antenna found, return 0 */
8fc7c58c 864static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
8ca151b5
JB		 865{
866 u8 new_ant_type;
867
5aa33553 868 if (!rate->ant || rate->ant > ANT_ABC)
8ca151b5
JB		 869 return 0;
870
5aa33553 871 if (!rs_is_valid_ant(valid_ant, rate->ant))
8ca151b5
JB		 872 return 0;
873
5aa33553 874 new_ant_type = ant_toggle_lookup[rate->ant];
8ca151b5 875
5aa33553 876 while ((new_ant_type != rate->ant) &&
8ca151b5
JB		 877 !rs_is_valid_ant(valid_ant, new_ant_type))
878 new_ant_type = ant_toggle_lookup[new_ant_type];
879
5aa33553 880 if (new_ant_type == rate->ant)
8ca151b5
JB		 881 return 0;
882
5aa33553
ES		 883 rate->ant = new_ant_type;
884
8ca151b5
JB		 885 return 1;
886}
887
8ca151b5 888static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
5aa33553 889 struct rs_rate *rate)
8ca151b5 890{
5aa33553 891 if (is_legacy(rate))
8ca151b5 892 return lq_sta->active_legacy_rate;
5aa33553 893 else if (is_siso(rate))
d310e405 894 return lq_sta->active_siso_rate;
5aa33553 895 else if (is_mimo2(rate))
d310e405
ES		 896 return lq_sta->active_mimo2_rate;
897
898 WARN_ON_ONCE(1);
899 return 0;
8ca151b5
JB		 900}
901
902static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
903 int rate_type)
904{
905 u8 high = IWL_RATE_INVALID;
906 u8 low = IWL_RATE_INVALID;
907
908 /* 802.11A or ht walks to the next literal adjacent rate in
909 * the rate table */
5aa33553 910 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
8ca151b5
JB		 911 int i;
912 u32 mask;
913
914 /* Find the previous rate that is in the rate mask */
915 i = index - 1;
916 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
917 if (rate_mask & mask) {
918 low = i;
919 break;
920 }
921 }
922
923 /* Find the next rate that is in the rate mask */
924 i = index + 1;
925 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
926 if (rate_mask & mask) {
927 high = i;
928 break;
929 }
930 }
931
932 return (high << 8) | low;
933 }
934
935 low = index;
936 while (low != IWL_RATE_INVALID) {
937 low = iwl_rates[low].prev_rs;
938 if (low == IWL_RATE_INVALID)
939 break;
940 if (rate_mask & (1 << low))
941 break;
8ca151b5
JB		 942 }
943
944 high = index;
945 while (high != IWL_RATE_INVALID) {
946 high = iwl_rates[high].next_rs;
947 if (high == IWL_RATE_INVALID)
948 break;
949 if (rate_mask & (1 << high))
950 break;
8ca151b5
JB		 951 }
952
953 return (high << 8) | low;
954}
955
e07be6d3
ES		 956static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
957 struct rs_rate *rate)
8ca151b5 958{
e07be6d3
ES		 959 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
960}
961
962/* Get the next supported lower rate in the current column.
963 * Return true if bottom rate in the current column was reached
964 */
965static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
966 struct rs_rate *rate)
967{
968 u8 low;
8ca151b5 969 u16 high_low;
e07be6d3 970 u16 rate_mask;
ae969afe 971 struct iwl_mvm *mvm = lq_sta->pers.drv;
e07be6d3
ES		 972
973 rate_mask = rs_get_supported_rates(lq_sta, rate);
974 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
975 rate->type);
976 low = high_low & 0xff;
977
978 /* Bottom rate of column reached */
979 if (low == IWL_RATE_INVALID)
980 return true;
981
982 rate->index = low;
983 return false;
984}
985
986/* Get the next rate to use following a column downgrade */
987static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
988 struct rs_rate *rate)
989{
ae969afe 990 struct iwl_mvm *mvm = lq_sta->pers.drv;
8ca151b5 991
e07be6d3
ES		 992 if (is_legacy(rate)) {
993 /* No column to downgrade from Legacy */
994 return;
995 } else if (is_siso(rate)) {
996 /* Downgrade to Legacy if we were in SISO */
8ca151b5 997 if (lq_sta->band == IEEE80211_BAND_5GHZ)
5aa33553 998 rate->type = LQ_LEGACY_A;
8ca151b5 999 else
5aa33553 1000 rate->type = LQ_LEGACY_G;
8ca151b5 1001
a56db7d1 1002 rate->bw = RATE_MCS_CHAN_WIDTH_20;
8ca151b5 1003
b800040d 1004 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
e07be6d3 1005 rate->index > IWL_RATE_MCS_9_INDEX);
8ca151b5 1006
e07be6d3 1007 rate->index = rs_ht_to_legacy[rate->index];
a3576ff2 1008 rate->ldpc = false;
e07be6d3
ES		 1009 } else {
1010 /* Downgrade to SISO with same MCS if in MIMO */
1011 rate->type = is_vht_mimo2(rate) ?
1012 LQ_VHT_SISO : LQ_HT_SISO;
8ca151b5
JB		 1013 }
1014
e07be6d3 1015 if (num_of_ant(rate->ant) > 1)
a0544272 1016 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
8ca151b5 1017
e07be6d3
ES		 1018 /* Relevant in both switching to SISO or Legacy */
1019 rate->sgi = false;
1020
1021 if (!rs_rate_supported(lq_sta, rate))
1022 rs_get_lower_rate_in_column(lq_sta, rate);
8ca151b5
JB		 1023}
1024
ba69d0e3
ES		 1025/* Check if both rates are identical
1026 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1027 * with a rate indicating STBC/BFER and ANT_AB.
1028 */
929e6ede 1029static inline bool rs_rate_equal(struct rs_rate *a,
ba69d0e3
ES		 1030 struct rs_rate *b,
1031 bool allow_ant_mismatch)
1032
929e6ede 1033{
ba69d0e3
ES		 1034 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1035 (a->bfer == b->bfer);
1036
1037 if (allow_ant_mismatch) {
1038 if (a->stbc || a->bfer) {
1039 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1040 a->stbc, a->bfer, a->ant);
1041 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1042 } else if (b->stbc || b->bfer) {
1043 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1044 b->stbc, b->bfer, b->ant);
1045 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1046 }
1047 }
1048
929e6ede 1049 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
ba69d0e3 1050 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
929e6ede
ES		 1051}
1052
1053/* Check if both rates share the same column */
1054static inline bool rs_rate_column_match(struct rs_rate *a,
1055 struct rs_rate *b)
8ca151b5 1056{
d8bafeaf
ES		 1057 bool ant_match;
1058
ba69d0e3 1059 if (a->stbc || a->bfer)
d8bafeaf
ES		 1060 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1061 else
1062 ant_match = (a->ant == b->ant);
1063
1064 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1065 && ant_match;
8ca151b5
JB		 1066}
1067
ad82d8a5
ES		 1068static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1069{
1070 if (is_legacy(rate)) {
1071 if (rate->ant == ANT_A)
1072 return RS_COLUMN_LEGACY_ANT_A;
1073
1074 if (rate->ant == ANT_B)
1075 return RS_COLUMN_LEGACY_ANT_B;
1076
1077 goto err;
1078 }
1079
1080 if (is_siso(rate)) {
1081 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1082 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1083 RS_COLUMN_SISO_ANT_A;
1084
1085 if (rate->ant == ANT_B)
1086 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1087 RS_COLUMN_SISO_ANT_B;
1088
1089 goto err;
1090 }
1091
1092 if (is_mimo(rate))
1093 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1094
1095err:
1096 return RS_COLUMN_INVALID;
1097}
1098
1ebc8f2e
ES		 1099static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1100{
1101 u8 tid = IWL_MAX_TID_COUNT;
1102
1103 if (ieee80211_is_data_qos(hdr->frame_control)) {
1104 u8 *qc = ieee80211_get_qos_ctl(hdr);
1105 tid = qc[0] & 0xf;
1106 }
1107
1108 if (unlikely(tid > IWL_MAX_TID_COUNT))
1109 tid = IWL_MAX_TID_COUNT;
1110
1111 return tid;
1112}
1113
1114void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1115 int tid, struct ieee80211_tx_info *info)
8ca151b5
JB		 1116{
1117 int legacy_success;
1118 int retries;
929e6ede 1119 int i;
8ca151b5 1120 struct iwl_lq_cmd *table;
929e6ede
ES		 1121 u32 lq_hwrate;
1122 struct rs_rate lq_rate, tx_resp_rate;
8ca151b5 1123 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
2fd647f8 1124 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
929e6ede 1125 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1ebc8f2e
ES		 1126 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1127 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
ba69d0e3
ES		 1128 bool allow_ant_mismatch = mvm->fw->ucode_capa.api[0] &
1129 IWL_UCODE_TLV_API_LQ_SS_PARAMS;
8ca151b5 1130
8ca151b5
JB		 1131 /* Treat uninitialized rate scaling data same as non-existing. */
1132 if (!lq_sta) {
1133 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1134 return;
ae969afe 1135 } else if (!lq_sta->pers.drv) {
8ca151b5
JB		 1136 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1137 return;
1138 }
1139
ad82d8a5
ES		 1140 /* This packet was aggregated but doesn't carry status info */
1141 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1142 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1143 return;
1144
1145 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1146
8e96440e 1147#ifdef CONFIG_MAC80211_DEBUGFS
ad82d8a5
ES		 1148 /* Disable last tx check if we are debugging with fixed rate but
1149 * update tx stats */
ae969afe 1150 if (lq_sta->pers.dbg_fixed_rate) {
ad82d8a5
ES		 1151 int index = tx_resp_rate.index;
1152 enum rs_column column;
1153 int attempts, success;
1154
1155 column = rs_get_column_from_rate(&tx_resp_rate);
1156 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1157 "Can't map rate 0x%x to column",
1158 tx_resp_hwrate))
1159 return;
1160
1161 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1162 attempts = info->status.ampdu_len;
1163 success = info->status.ampdu_ack_len;
1164 } else {
1165 attempts = info->status.rates[0].count;
1166 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1167 }
1168
1169 lq_sta->pers.tx_stats[column][index].total += attempts;
1170 lq_sta->pers.tx_stats[column][index].success += success;
1171
1172 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1173 tx_resp_hwrate, success, attempts);
87d5e415
ES		 1174 return;
1175 }
1176#endif
8ca151b5 1177
87d5e415 1178 if (time_after(jiffies,
834437da
ES		 1179 (unsigned long)(lq_sta->last_tx +
1180 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
efad21d2
JB		 1181 int t;
1182
87d5e415 1183 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
efad21d2
JB		 1184 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1185 ieee80211_stop_tx_ba_session(sta, t);
87d5e415 1186
1ebc8f2e 1187 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
87d5e415
ES		 1188 return;
1189 }
1190 lq_sta->last_tx = jiffies;
1191
929e6ede
ES		 1192 /* Ignore this Tx frame response if its initial rate doesn't match
1193 * that of latest Link Quality command. There may be stragglers
1194 * from a previous Link Quality command, but we're no longer interested
1195 * in those; they're either from the "active" mode while we're trying
1196 * to check "search" mode, or a prior "search" mode after we've moved
1197 * to a new "search" mode (which might become the new "active" mode).
1198 */
1199 table = &lq_sta->lq;
1200 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1201 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
929e6ede 1202
8ca151b5 1203 /* Here we actually compare this rate to the latest LQ command */
ba69d0e3 1204 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
8ca151b5 1205 IWL_DEBUG_RATE(mvm,
929e6ede
ES		 1206 "initial tx resp rate 0x%x does not match 0x%x\n",
1207 tx_resp_hwrate, lq_hwrate);
1208
8ca151b5
JB		 1209 /*
1210 * Since rates mis-match, the last LQ command may have failed.
1211 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1212 * ... driver.
1213 */
1214 lq_sta->missed_rate_counter++;
834437da 1215 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
8ca151b5 1216 lq_sta->missed_rate_counter = 0;
b3b06a32
ES		 1217 IWL_DEBUG_RATE(mvm,
1218 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1219 lq_sta->rs_state);
9e680946 1220 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1221 }
1222 /* Regardless, ignore this status info for outdated rate */
1223 return;
1224 } else
1225 /* Rate did match, so reset the missed_rate_counter */
1226 lq_sta->missed_rate_counter = 0;
1227
26a2cc01 1228 if (!lq_sta->search_better_tbl) {
8ca151b5
JB		 1229 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1230 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
26a2cc01 1231 } else {
8ca151b5
JB		 1232 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1233 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
26a2cc01
ES		 1234 }
1235
929e6ede 1236 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
8ca151b5
JB		 1237 IWL_DEBUG_RATE(mvm,
1238 "Neither active nor search matches tx rate\n");
1239 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 1240 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
8ca151b5 1241 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553 1242 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
929e6ede 1243 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
5aa33553 1244
8ca151b5
JB		 1245 /*
1246 * no matching table found, let's by-pass the data collection
1247 * and continue to perform rate scale to find the rate table
1248 */
1249 rs_stay_in_table(lq_sta, true);
1250 goto done;
1251 }
1252
1253 /*
1254 * Updating the frame history depends on whether packets were
1255 * aggregated.
1256 *
1257 * For aggregation, all packets were transmitted at the same rate, the
1258 * first index into rate scale table.
1259 */
1260 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
d6bda667
ES		 1261 /* ampdu_ack_len = 0 marks no BA was received. In this case
1262 * treat it as a single frame loss as we don't want the success
1263 * ratio to dip too quickly because a BA wasn't received
1264 */
1265 if (info->status.ampdu_ack_len == 0)
1266 info->status.ampdu_len = 1;
1267
929e6ede 1268 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
8ca151b5 1269 info->status.ampdu_len,
2fd647f8
EP		 1270 info->status.ampdu_ack_len,
1271 reduced_txp);
8ca151b5
JB		 1272
1273 /* Update success/fail counts if not searching for new mode */
b3b06a32 1274 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1275 lq_sta->total_success += info->status.ampdu_ack_len;
1276 lq_sta->total_failed += (info->status.ampdu_len -
1277 info->status.ampdu_ack_len);
1278 }
1279 } else {
90cb1237 1280 /* For legacy, update frame history with for each Tx retry. */
8ca151b5
JB		 1281 retries = info->status.rates[0].count - 1;
1282 /* HW doesn't send more than 15 retries */
1283 retries = min(retries, 15);
1284
1285 /* The last transmission may have been successful */
1286 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1287 /* Collect data for each rate used during failed TX attempts */
1288 for (i = 0; i <= retries; ++i) {
929e6ede
ES		 1289 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1290 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1291 &lq_rate);
8ca151b5
JB		 1292 /*
1293 * Only collect stats if retried rate is in the same RS
1294 * table as active/search.
1295 */
929e6ede 1296 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
8ca151b5 1297 tmp_tbl = curr_tbl;
929e6ede
ES		 1298 else if (rs_rate_column_match(&lq_rate,
1299 &other_tbl->rate))
8ca151b5 1300 tmp_tbl = other_tbl;
4107dbd2 1301 else
8ca151b5 1302 continue;
4107dbd2 1303
929e6ede
ES		 1304 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1305 1, i < retries ? 0 : legacy_success,
2fd647f8 1306 reduced_txp);
8ca151b5
JB		 1307 }
1308
1309 /* Update success/fail counts if not searching for new mode */
b3b06a32 1310 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1311 lq_sta->total_success += legacy_success;
1312 lq_sta->total_failed += retries + (1 - legacy_success);
1313 }
1314 }
1315 /* The last TX rate is cached in lq_sta; it's set in if/else above */
929e6ede 1316 lq_sta->last_rate_n_flags = lq_hwrate;
2fd647f8 1317 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
8ca151b5
JB		 1318done:
1319 /* See if there's a better rate or modulation mode to try. */
8dfc2751 1320 if (sta->supp_rates[info->band])
1ebc8f2e
ES		 1321 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1322}
1323
1324/*
1325 * mac80211 sends us Tx status
1326 */
1327static void rs_mac80211_tx_status(void *mvm_r,
1328 struct ieee80211_supported_band *sband,
1329 struct ieee80211_sta *sta, void *priv_sta,
1330 struct sk_buff *skb)
1331{
1332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1333 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1334 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1335 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1336
1337 if (!ieee80211_is_data(hdr->frame_control) ||
1338 info->flags & IEEE80211_TX_CTL_NO_ACK)
1339 return;
1340
1341 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
8ca151b5
JB		 1342}
1343
1344/*
1345 * Begin a period of staying with a selected modulation mode.
1346 * Set "stay_in_tbl" flag to prevent any mode switches.
1347 * Set frame tx success limits according to legacy vs. high-throughput,
1348 * and reset overall (spanning all rates) tx success history statistics.
1349 * These control how long we stay using same modulation mode before
1350 * searching for a new mode.
1351 */
1352static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1353 struct iwl_lq_sta *lq_sta)
1354{
b3b06a32
ES		 1355 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1356 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
8ca151b5 1357 if (is_legacy) {
834437da
ES		 1358 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1359 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1360 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
8ca151b5 1361 } else {
834437da
ES		 1362 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1363 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1364 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
8ca151b5
JB		 1365 }
1366 lq_sta->table_count = 0;
1367 lq_sta->total_failed = 0;
1368 lq_sta->total_success = 0;
1369 lq_sta->flush_timer = jiffies;
b3b06a32 1370 lq_sta->visited_columns = 0;
8ca151b5
JB		 1371}
1372
6a028d9a
ES		 1373static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1374{
1375 if (rate_mask)
1376 return find_last_bit(&rate_mask, BITS_PER_LONG);
1377 return IWL_RATE_INVALID;
1378}
1379
198266a3
ES		 1380static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1381 const struct rs_tx_column *column)
1382{
1383 switch (column->mode) {
1384 case RS_LEGACY:
1385 return lq_sta->max_legacy_rate_idx;
1386 case RS_SISO:
1387 return lq_sta->max_siso_rate_idx;
1388 case RS_MIMO2:
1389 return lq_sta->max_mimo2_rate_idx;
1390 default:
1391 WARN_ON_ONCE(1);
1392 }
1393
1394 return lq_sta->max_legacy_rate_idx;
1395}
1396
a34529e8 1397static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
198266a3
ES		 1398 const struct rs_tx_column *column,
1399 u32 bw)
8ca151b5
JB		 1400{
1401 /* Used to choose among HT tables */
a34529e8 1402 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
8ca151b5 1403
b3b06a32
ES		 1404 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1405 column->mode != RS_SISO &&
1406 column->mode != RS_MIMO2))
1407 return expected_tpt_legacy;
8ca151b5
JB		 1408
1409 /* Legacy rates have only one table */
b3b06a32
ES		 1410 if (column->mode == RS_LEGACY)
1411 return expected_tpt_legacy;
8ca151b5 1412
d310e405 1413 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
8ca151b5 1414 /* Choose among many HT tables depending on number of streams
d310e405 1415 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
8ca151b5 1416 * status */
b3b06a32
ES		 1417 if (column->mode == RS_SISO) {
1418 switch (bw) {
d310e405
ES		 1419 case RATE_MCS_CHAN_WIDTH_20:
1420 ht_tbl_pointer = expected_tpt_siso_20MHz;
1421 break;
1422 case RATE_MCS_CHAN_WIDTH_40:
1423 ht_tbl_pointer = expected_tpt_siso_40MHz;
1424 break;
1425 case RATE_MCS_CHAN_WIDTH_80:
1426 ht_tbl_pointer = expected_tpt_siso_80MHz;
1427 break;
1428 default:
1429 WARN_ON_ONCE(1);
1430 }
b3b06a32
ES		 1431 } else if (column->mode == RS_MIMO2) {
1432 switch (bw) {
d310e405
ES		 1433 case RATE_MCS_CHAN_WIDTH_20:
1434 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1435 break;
1436 case RATE_MCS_CHAN_WIDTH_40:
1437 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1438 break;
1439 case RATE_MCS_CHAN_WIDTH_80:
1440 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1441 break;
1442 default:
1443 WARN_ON_ONCE(1);
1444 }
1445 } else {
1446 WARN_ON_ONCE(1);
d972ab31 1447 }
8ca151b5 1448
b3b06a32
ES		 1449 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1450 return ht_tbl_pointer[0];
1451 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1452 return ht_tbl_pointer[1];
1453 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1454 return ht_tbl_pointer[2];
8ca151b5 1455 else /* AGG+SGI */
b3b06a32
ES		 1456 return ht_tbl_pointer[3];
1457}
1458
1459static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1460 struct iwl_scale_tbl_info *tbl)
1461{
1462 struct rs_rate *rate = &tbl->rate;
1463 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1464
1465 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
8ca151b5
JB		 1466}
1467
8ca151b5
JB		 1468static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1469 struct iwl_lq_sta *lq_sta,
1470 struct iwl_scale_tbl_info *tbl, /* "search" */
80763515 1471 unsigned long rate_mask, s8 index)
8ca151b5 1472{
8ca151b5
JB		 1473 struct iwl_scale_tbl_info *active_tbl =
1474 &(lq_sta->lq_info[lq_sta->active_tbl]);
80763515
ES		 1475 s32 success_ratio = active_tbl->win[index].success_ratio;
1476 u16 expected_current_tpt = active_tbl->expected_tpt[index];
a34529e8 1477 const u16 *tpt_tbl = tbl->expected_tpt;
8ca151b5 1478 u16 high_low;
80763515
ES		 1479 u32 target_tpt;
1480 int rate_idx;
8ca151b5 1481
834437da 1482 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
80763515
ES		 1483 target_tpt = 100 * expected_current_tpt;
1484 IWL_DEBUG_RATE(mvm,
1485 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1486 success_ratio, target_tpt);
1487 } else {
1488 target_tpt = lq_sta->last_tpt;
1489 IWL_DEBUG_RATE(mvm,
1490 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1491 success_ratio, target_tpt);
1492 }
8ca151b5 1493
80763515 1494 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
8ca151b5 1495
80763515
ES		 1496 while (rate_idx != IWL_RATE_INVALID) {
1497 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1498 break;
8ca151b5 1499
80763515
ES		 1500 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1501 tbl->rate.type);
8ca151b5 1502
80763515 1503 rate_idx = (high_low >> 8) & 0xff;
8ca151b5
JB		 1504 }
1505
80763515
ES		 1506 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1507 rate_idx, target_tpt,
1508 rate_idx != IWL_RATE_INVALID ?
1509 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1510
1511 return rate_idx;
8ca151b5
JB		 1512}
1513
5aa33553 1514static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
d310e405
ES		 1515{
1516 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
5aa33553 1517 return RATE_MCS_CHAN_WIDTH_80;
d310e405 1518 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
5aa33553
ES		 1519 return RATE_MCS_CHAN_WIDTH_40;
1520
1521 return RATE_MCS_CHAN_WIDTH_20;
d310e405
ES		 1522}
1523
8ca151b5
JB		 1524/*
1525 * Check whether we should continue using same modulation mode, or
1526 * begin search for a new mode, based on:
1527 * 1) # tx successes or failures while using this mode
1528 * 2) # times calling this function
1529 * 3) elapsed time in this mode (not used, for now)
1530 */
1531static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1532{
1533 struct iwl_scale_tbl_info *tbl;
8ca151b5
JB		 1534 int active_tbl;
1535 int flush_interval_passed = 0;
1536 struct iwl_mvm *mvm;
1537
ae969afe 1538 mvm = lq_sta->pers.drv;
8ca151b5
JB		 1539 active_tbl = lq_sta->active_tbl;
1540
1541 tbl = &(lq_sta->lq_info[active_tbl]);
1542
1543 /* If we've been disallowing search, see if we should now allow it */
b3b06a32 1544 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1545 /* Elapsed time using current modulation mode */
1546 if (lq_sta->flush_timer)
1547 flush_interval_passed =
1548 time_after(jiffies,
1549 (unsigned long)(lq_sta->flush_timer +
834437da 1550 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
8ca151b5
JB		 1551
1552 /*
1553 * Check if we should allow search for new modulation mode.
1554 * If many frames have failed or succeeded, or we've used
1555 * this same modulation for a long time, allow search, and
1556 * reset history stats that keep track of whether we should
1557 * allow a new search. Also (below) reset all bitmaps and
1558 * stats in active history.
1559 */
1560 if (force_search ||
1561 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1562 (lq_sta->total_success > lq_sta->max_success_limit) ||
1563 ((!lq_sta->search_better_tbl) &&
1564 (lq_sta->flush_timer) && (flush_interval_passed))) {
1565 IWL_DEBUG_RATE(mvm,
1566 "LQ: stay is expired %d %d %d\n",
1567 lq_sta->total_failed,
1568 lq_sta->total_success,
1569 flush_interval_passed);
1570
1571 /* Allow search for new mode */
b3b06a32
ES		 1572 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1573 IWL_DEBUG_RATE(mvm,
1574 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
8ca151b5
JB		 1575 lq_sta->total_failed = 0;
1576 lq_sta->total_success = 0;
1577 lq_sta->flush_timer = 0;
b3b06a32
ES		 1578 /* mark the current column as visited */
1579 lq_sta->visited_columns = BIT(tbl->column);
8ca151b5
JB		 1580 /*
1581 * Else if we've used this modulation mode enough repetitions
1582 * (regardless of elapsed time or success/failure), reset
1583 * history bitmaps and rate-specific stats for all rates in
1584 * active table.
1585 */
1586 } else {
1587 lq_sta->table_count++;
1588 if (lq_sta->table_count >=
1589 lq_sta->table_count_limit) {
1590 lq_sta->table_count = 0;
1591
1592 IWL_DEBUG_RATE(mvm,
1593 "LQ: stay in table clear win\n");
b804eeb6 1594 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1595 }
1596 }
1597
1598 /* If transitioning to allow "search", reset all history
1599 * bitmaps and stats in active table (this will become the new
1600 * "search" table). */
b3b06a32 1601 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
b804eeb6 1602 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1603 }
1604 }
1605}
1606
1607/*
1608 * setup rate table in uCode
1609 */
1610static void rs_update_rate_tbl(struct iwl_mvm *mvm,
9145d151 1611 struct ieee80211_sta *sta,
8ca151b5 1612 struct iwl_lq_sta *lq_sta,
7b9d74e4 1613 struct iwl_scale_tbl_info *tbl)
8ca151b5 1614{
7b9d74e4 1615 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
9e680946 1616 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1617}
1618
b3b06a32
ES		 1619static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1620 struct iwl_lq_sta *lq_sta,
1621 struct ieee80211_sta *sta,
1622 struct iwl_scale_tbl_info *tbl)
1623{
198266a3 1624 int i, j, max_rate;
b3b06a32
ES		 1625 enum rs_column next_col_id;
1626 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1627 const struct rs_tx_column *next_col;
1628 allow_column_func_t allow_func;
a0544272 1629 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
a34529e8 1630 const u16 *expected_tpt_tbl;
198266a3 1631 u16 tpt, max_expected_tpt;
b3b06a32
ES		 1632
1633 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1634 next_col_id = curr_col->next_columns[i];
1635
1636 if (next_col_id == RS_COLUMN_INVALID)
1637 continue;
1638
1639 if (lq_sta->visited_columns & BIT(next_col_id)) {
1640 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1641 next_col_id);
1642 continue;
1643 }
1644
1645 next_col = &rs_tx_columns[next_col_id];
1646
1647 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1648 IWL_DEBUG_RATE(mvm,
1649 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1650 next_col_id, valid_ants, next_col->ant);
1651 continue;
1652 }
1653
1654 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1655 allow_func = next_col->checks[j];
0b8d17f3 1656 if (allow_func && !allow_func(mvm, sta, tbl, next_col))
b3b06a32
ES		 1657 break;
1658 }
1659
1660 if (j != MAX_COLUMN_CHECKS) {
1661 IWL_DEBUG_RATE(mvm,
1662 "Skip column %d: not allowed (check %d failed)\n",
1663 next_col_id, j);
1664
1665 continue;
1666 }
1667
1668 tpt = lq_sta->last_tpt / 100;
1669 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
049e0c33 1670 rs_bw_from_sta_bw(sta));
b3b06a32
ES		 1671 if (WARN_ON_ONCE(!expected_tpt_tbl))
1672 continue;
1673
198266a3 1674 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
6a028d9a
ES		 1675 if (max_rate == IWL_RATE_INVALID) {
1676 IWL_DEBUG_RATE(mvm,
1677 "Skip column %d: no rate is allowed in this column\n",
1678 next_col_id);
198266a3 1679 continue;
6a028d9a 1680 }
b3b06a32 1681
198266a3 1682 max_expected_tpt = expected_tpt_tbl[max_rate];
b3b06a32
ES		 1683 if (tpt >= max_expected_tpt) {
1684 IWL_DEBUG_RATE(mvm,
1685 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1686 next_col_id, max_expected_tpt, tpt);
1687 continue;
1688 }
1689
198266a3
ES		 1690 IWL_DEBUG_RATE(mvm,
1691 "Found potential column %d. Max expected %d current %d\n",
1692 next_col_id, max_expected_tpt, tpt);
b3b06a32
ES		 1693 break;
1694 }
1695
1696 if (i == MAX_NEXT_COLUMNS)
1697 return RS_COLUMN_INVALID;
1698
b3b06a32
ES		 1699 return next_col_id;
1700}
1701
1702static int rs_switch_to_column(struct iwl_mvm *mvm,
1703 struct iwl_lq_sta *lq_sta,
1704 struct ieee80211_sta *sta,
1705 enum rs_column col_id)
1706{
1707 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1708 struct iwl_scale_tbl_info *search_tbl =
1709 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1710 struct rs_rate *rate = &search_tbl->rate;
1711 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1712 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1713 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1714 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
80763515 1715 unsigned long rate_mask = 0;
b3b06a32
ES		 1716 u32 rate_idx = 0;
1717
1718 memcpy(search_tbl, tbl, sz);
1719
1720 rate->sgi = column->sgi;
1721 rate->ant = column->ant;
1722
1723 if (column->mode == RS_LEGACY) {
1724 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1725 rate->type = LQ_LEGACY_A;
1726 else
1727 rate->type = LQ_LEGACY_G;
1728
d8bafeaf
ES		 1729 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1730 rate->ldpc = false;
b3b06a32
ES		 1731 rate_mask = lq_sta->active_legacy_rate;
1732 } else if (column->mode == RS_SISO) {
1733 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1734 rate_mask = lq_sta->active_siso_rate;
1735 } else if (column->mode == RS_MIMO2) {
1736 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1737 rate_mask = lq_sta->active_mimo2_rate;
1738 } else {
1739 WARN_ON_ONCE("Bad column mode");
1740 }
1741
d8bafeaf
ES		 1742 if (column->mode != RS_LEGACY) {
1743 rate->bw = rs_bw_from_sta_bw(sta);
1744 rate->ldpc = lq_sta->ldpc;
1745 }
1746
b3b06a32
ES		 1747 search_tbl->column = col_id;
1748 rs_set_expected_tpt_table(lq_sta, search_tbl);
1749
75d3e2d6
ES		 1750 lq_sta->visited_columns |= BIT(col_id);
1751
b3b06a32
ES		 1752 /* Get the best matching rate if we're changing modes. e.g.
1753 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1754 */
1755 if (curr_column->mode != column->mode) {
1756 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1757 rate_mask, rate->index);
1758
1759 if ((rate_idx == IWL_RATE_INVALID) ||
1760 !(BIT(rate_idx) & rate_mask)) {
1761 IWL_DEBUG_RATE(mvm,
1762 "can not switch with index %d"
80763515 1763 " rate mask %lx\n",
b3b06a32
ES		 1764 rate_idx, rate_mask);
1765
1766 goto err;
1767 }
1768
1769 rate->index = rate_idx;
1770 }
1771
b3b06a32
ES		 1772 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1773 col_id, rate->index);
1774
b3b06a32
ES		 1775 return 0;
1776
1777err:
1778 rate->type = LQ_NONE;
1779 return -1;
1780}
1781
4e4b815c
ES		 1782static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1783 struct iwl_scale_tbl_info *tbl,
1784 s32 sr, int low, int high,
1785 int current_tpt,
1786 int low_tpt, int high_tpt)
1787{
1788 enum rs_action action = RS_ACTION_STAY;
1789
834437da
ES		 1790 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1791 (current_tpt == 0)) {
4e4b815c 1792 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1793 "Decrease rate because of low SR\n");
1794 return RS_ACTION_DOWNSCALE;
4e4b815c
ES		 1795 }
1796
e53839eb
ES		 1797 if ((low_tpt == IWL_INVALID_VALUE) &&
1798 (high_tpt == IWL_INVALID_VALUE) &&
1799 (high != IWL_RATE_INVALID)) {
4e4b815c 1800 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1801 "No data about high/low rates. Increase rate\n");
1802 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1803 }
1804
e53839eb
ES		 1805 if ((high_tpt == IWL_INVALID_VALUE) &&
1806 (high != IWL_RATE_INVALID) &&
1807 (low_tpt != IWL_INVALID_VALUE) &&
1808 (low_tpt < current_tpt)) {
1809 IWL_DEBUG_RATE(mvm,
1810 "No data about high rate and low rate is worse. Increase rate\n");
1811 return RS_ACTION_UPSCALE;
1812 }
4e4b815c 1813
e53839eb
ES		 1814 if ((high_tpt != IWL_INVALID_VALUE) &&
1815 (high_tpt > current_tpt)) {
1816 IWL_DEBUG_RATE(mvm,
1817 "Higher rate is better. Increate rate\n");
1818 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1819 }
1820
e53839eb
ES		 1821 if ((low_tpt != IWL_INVALID_VALUE) &&
1822 (high_tpt != IWL_INVALID_VALUE) &&
1823 (low_tpt < current_tpt) &&
1824 (high_tpt < current_tpt)) {
4e4b815c 1825 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1826 "Both high and low are worse. Maintain rate\n");
1827 return RS_ACTION_STAY;
1828 }
1829
1830 if ((low_tpt != IWL_INVALID_VALUE) &&
1831 (low_tpt > current_tpt)) {
1832 IWL_DEBUG_RATE(mvm,
1833 "Lower rate is better\n");
1834 action = RS_ACTION_DOWNSCALE;
1835 goto out;
1836 }
1837
1838 if ((low_tpt == IWL_INVALID_VALUE) &&
1839 (low != IWL_RATE_INVALID)) {
4e4b815c 1840 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1841 "No data about lower rate\n");
1842 action = RS_ACTION_DOWNSCALE;
1843 goto out;
1844 }
1845
1846 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1847
1848out:
1849 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
834437da 1850 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
e53839eb
ES		 1851 IWL_DEBUG_RATE(mvm,
1852 "SR is above NO DECREASE. Avoid downscale\n");
1853 action = RS_ACTION_STAY;
1854 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1855 IWL_DEBUG_RATE(mvm,
1856 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1857 action = RS_ACTION_STAY;
1858 } else {
1859 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1860 }
4e4b815c
ES		 1861 }
1862
1863 return action;
1864}
b3b06a32 1865
d8bafeaf
ES		 1866static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1867 struct iwl_lq_sta *lq_sta)
1868{
d8bafeaf
ES		 1869 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1870 * supports STBC of at least 1*SS
1871 */
3d44eebf 1872 if (!lq_sta->stbc_capable)
d8bafeaf
ES		 1873 return false;
1874
d8bafeaf
ES		 1875 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1876 return false;
1877
1878 return true;
1879}
1880
2fd647f8
EP		 1881static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1882 int *weaker, int *stronger)
1883{
834437da 1884 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2fd647f8
EP		 1885 if (*weaker > TPC_MAX_REDUCTION)
1886 *weaker = TPC_INVALID;
1887
834437da 1888 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2fd647f8
EP		 1889 if (*stronger < 0)
1890 *stronger = TPC_INVALID;
1891}
1892
1e9551de
ES		 1893static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1894 struct rs_rate *rate, enum ieee80211_band band)
2fd647f8
EP		 1895{
1896 int index = rate->index;
1e9551de
ES		 1897 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1898 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1899 !vif->bss_conf.ps);
2fd647f8 1900
1e9551de
ES		 1901 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1902 cam, sta_ps_disabled);
2fd647f8
EP		 1903 /*
1904 * allow tpc only if power management is enabled, or bt coex
1905 * activity grade allows it and we are on 2.4Ghz.
1906 */
1e9551de 1907 if ((cam || sta_ps_disabled) &&
2fd647f8
EP		 1908 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1909 return false;
1910
1911 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1912 if (is_legacy(rate))
1913 return index == IWL_RATE_54M_INDEX;
1914 if (is_ht(rate))
1915 return index == IWL_RATE_MCS_7_INDEX;
1916 if (is_vht(rate))
1917 return index == IWL_RATE_MCS_7_INDEX ||
1918 index == IWL_RATE_MCS_8_INDEX ||
1919 index == IWL_RATE_MCS_9_INDEX;
1920
1921 WARN_ON_ONCE(1);
1922 return false;
1923}
1924
1925enum tpc_action {
1926 TPC_ACTION_STAY,
1927 TPC_ACTION_DECREASE,
1928 TPC_ACTION_INCREASE,
1929 TPC_ACTION_NO_RESTIRCTION,
1930};
1931
1932static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1933 s32 sr, int weak, int strong,
1934 int current_tpt,
1935 int weak_tpt, int strong_tpt)
1936{
1937 /* stay until we have valid tpt */
1938 if (current_tpt == IWL_INVALID_VALUE) {
1939 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1940 return TPC_ACTION_STAY;
1941 }
1942
1943 /* Too many failures, increase txp */
834437da
ES		 1944 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1945 current_tpt == 0) {
2fd647f8
EP		 1946 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1947 return TPC_ACTION_NO_RESTIRCTION;
1948 }
1949
1950 /* try decreasing first if applicable */
1951 if (weak != TPC_INVALID) {
1952 if (weak_tpt == IWL_INVALID_VALUE &&
1953 (strong_tpt == IWL_INVALID_VALUE ||
1954 current_tpt >= strong_tpt)) {
1955 IWL_DEBUG_RATE(mvm,
1956 "no weak txp measurement. decrease txp\n");
1957 return TPC_ACTION_DECREASE;
1958 }
1959
1960 if (weak_tpt > current_tpt) {
1961 IWL_DEBUG_RATE(mvm,
1962 "lower txp has better tpt. decrease txp\n");
1963 return TPC_ACTION_DECREASE;
1964 }
1965 }
1966
1967 /* next, increase if needed */
834437da
ES		 1968 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1969 strong != TPC_INVALID) {
2fd647f8
EP		 1970 if (weak_tpt == IWL_INVALID_VALUE &&
1971 strong_tpt != IWL_INVALID_VALUE &&
1972 current_tpt < strong_tpt) {
1973 IWL_DEBUG_RATE(mvm,
1974 "higher txp has better tpt. increase txp\n");
1975 return TPC_ACTION_INCREASE;
1976 }
1977
1978 if (weak_tpt < current_tpt &&
1979 (strong_tpt == IWL_INVALID_VALUE ||
1980 strong_tpt > current_tpt)) {
1981 IWL_DEBUG_RATE(mvm,
1982 "lower txp has worse tpt. increase txp\n");
1983 return TPC_ACTION_INCREASE;
1984 }
1985 }
1986
1987 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1988 return TPC_ACTION_STAY;
1989}
1990
1991static bool rs_tpc_perform(struct iwl_mvm *mvm,
1992 struct ieee80211_sta *sta,
1993 struct iwl_lq_sta *lq_sta,
1994 struct iwl_scale_tbl_info *tbl)
1995{
9d8ce6af 1996 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2fd647f8
EP		 1997 struct ieee80211_vif *vif = mvm_sta->vif;
1998 struct ieee80211_chanctx_conf *chanctx_conf;
1999 enum ieee80211_band band;
2000 struct iwl_rate_scale_data *window;
2001 struct rs_rate *rate = &tbl->rate;
2002 enum tpc_action action;
2003 s32 sr;
2004 u8 cur = lq_sta->lq.reduced_tpc;
2005 int current_tpt;
2006 int weak, strong;
2007 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2008
9a75b3df 2009#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 2010 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
3c6acb61 2011 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
ae969afe
EP		 2012 lq_sta->pers.dbg_fixed_txp_reduction);
2013 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2014 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
9a75b3df
EP		 2015 }
2016#endif
2017
2fd647f8
EP		 2018 rcu_read_lock();
2019 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2020 if (WARN_ON(!chanctx_conf))
2021 band = IEEE80211_NUM_BANDS;
2022 else
2023 band = chanctx_conf->def.chan->band;
2024 rcu_read_unlock();
2025
1e9551de 2026 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2fd647f8 2027 IWL_DEBUG_RATE(mvm,
3c6acb61 2028 "tpc is not allowed. remove txp restrictions\n");
2fd647f8
EP		 2029 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2030 return cur != TPC_NO_REDUCTION;
2031 }
2032
2033 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2034
2035 /* Collect measured throughputs for current and adjacent rates */
2036 window = tbl->tpc_win;
2037 sr = window[cur].success_ratio;
2038 current_tpt = window[cur].average_tpt;
2039 if (weak != TPC_INVALID)
2040 weak_tpt = window[weak].average_tpt;
2041 if (strong != TPC_INVALID)
2042 strong_tpt = window[strong].average_tpt;
2043
2044 IWL_DEBUG_RATE(mvm,
2045 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2046 cur, current_tpt, sr, weak, strong,
2047 weak_tpt, strong_tpt);
2048
2049 action = rs_get_tpc_action(mvm, sr, weak, strong,
2050 current_tpt, weak_tpt, strong_tpt);
2051
2052 /* override actions if we are on the edge */
2053 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
3c6acb61 2054 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2fd647f8
EP		 2055 action = TPC_ACTION_STAY;
2056 } else if (strong == TPC_INVALID &&
2057 (action == TPC_ACTION_INCREASE ||
2058 action == TPC_ACTION_NO_RESTIRCTION)) {
3c6acb61 2059 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2fd647f8
EP		 2060 action = TPC_ACTION_STAY;
2061 }
2062
2063 switch (action) {
2064 case TPC_ACTION_DECREASE:
2065 lq_sta->lq.reduced_tpc = weak;
2066 return true;
2067 case TPC_ACTION_INCREASE:
2068 lq_sta->lq.reduced_tpc = strong;
2069 return true;
2070 case TPC_ACTION_NO_RESTIRCTION:
2071 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2072 return true;
2073 case TPC_ACTION_STAY:
2074 /* do nothing */
2075 break;
2076 }
2077 return false;
2078}
2079
8ca151b5
JB		 2080/*
2081 * Do rate scaling and search for new modulation mode.
2082 */
2083static void rs_rate_scale_perform(struct iwl_mvm *mvm,
8ca151b5 2084 struct ieee80211_sta *sta,
1ebc8f2e
ES		 2085 struct iwl_lq_sta *lq_sta,
2086 int tid)
8ca151b5 2087{
8ca151b5
JB		 2088 int low = IWL_RATE_INVALID;
2089 int high = IWL_RATE_INVALID;
2090 int index;
8ca151b5
JB		 2091 struct iwl_rate_scale_data *window = NULL;
2092 int current_tpt = IWL_INVALID_VALUE;
2093 int low_tpt = IWL_INVALID_VALUE;
2094 int high_tpt = IWL_INVALID_VALUE;
2095 u32 fail_count;
4e4b815c 2096 enum rs_action scale_action = RS_ACTION_STAY;
8ca151b5
JB		 2097 u16 rate_mask;
2098 u8 update_lq = 0;
2099 struct iwl_scale_tbl_info *tbl, *tbl1;
8ca151b5
JB		 2100 u8 active_tbl = 0;
2101 u8 done_search = 0;
2102 u16 high_low;
2103 s32 sr;
9d015a03 2104 u8 prev_agg = lq_sta->is_agg;
9d8ce6af 2105 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
8ca151b5 2106 struct iwl_mvm_tid_data *tid_data;
5aa33553 2107 struct rs_rate *rate;
8ca151b5 2108
efed6640 2109 lq_sta->is_agg = !!sta_priv->agg_tids;
8ca151b5
JB		 2110
2111 /*
2112 * Select rate-scale / modulation-mode table to work with in
2113 * the rest of this function: "search" if searching for better
2114 * modulation mode, or "active" if doing rate scaling within a mode.
2115 */
2116 if (!lq_sta->search_better_tbl)
2117 active_tbl = lq_sta->active_tbl;
2118 else
2119 active_tbl = 1 - lq_sta->active_tbl;
2120
2121 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2122 rate = &tbl->rate;
8ca151b5 2123
9d015a03
ES		 2124 if (prev_agg != lq_sta->is_agg) {
2125 IWL_DEBUG_RATE(mvm,
2126 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2127 prev_agg, lq_sta->is_agg);
2128 rs_set_expected_tpt_table(lq_sta, tbl);
b804eeb6 2129 rs_rate_scale_clear_tbl_windows(mvm, tbl);
9d015a03
ES		 2130 }
2131
8ca151b5
JB		 2132 /* current tx rate */
2133 index = lq_sta->last_txrate_idx;
2134
8ca151b5 2135 /* rates available for this association, and for modulation mode */
a8ff14f5 2136 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5 2137
ca6f38ff 2138 if (!(BIT(index) & rate_mask)) {
8ca151b5
JB		 2139 IWL_ERR(mvm, "Current Rate is not valid\n");
2140 if (lq_sta->search_better_tbl) {
2141 /* revert to active table if search table is not valid*/
5aa33553 2142 rate->type = LQ_NONE;
8ca151b5
JB		 2143 lq_sta->search_better_tbl = 0;
2144 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
7b9d74e4 2145 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
8ca151b5
JB		 2146 }
2147 return;
2148 }
2149
2150 /* Get expected throughput table and history window for current rate */
2151 if (!tbl->expected_tpt) {
2152 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2153 return;
2154 }
2155
2536e7c3 2156 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2157 window = &(tbl->win[index]);
2158
2159 /*
2160 * If there is not enough history to calculate actual average
2161 * throughput, keep analyzing results of more tx frames, without
2162 * changing rate or mode (bypass most of the rest of this function).
2163 * Set up new rate table in uCode only if old rate is not supported
2164 * in current association (use new rate found above).
2165 */
2166 fail_count = window->counter - window->success_counter;
834437da
ES		 2167 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2168 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
8ca151b5 2169 IWL_DEBUG_RATE(mvm,
4d30ee82 2170 "(%s: %d): Test Window: succ %d total %d\n",
5aa33553 2171 rs_pretty_lq_type(rate->type),
4d30ee82 2172 index, window->success_counter, window->counter);
8ca151b5
JB		 2173
2174 /* Can't calculate this yet; not enough history */
2175 window->average_tpt = IWL_INVALID_VALUE;
2176
2177 /* Should we stay with this modulation mode,
2178 * or search for a new one? */
2179 rs_stay_in_table(lq_sta, false);
2180
2181 goto out;
2182 }
2183 /* Else we have enough samples; calculate estimate of
2184 * actual average throughput */
2185 if (window->average_tpt != ((window->success_ratio *
2186 tbl->expected_tpt[index] + 64) / 128)) {
8ca151b5
JB		 2187 window->average_tpt = ((window->success_ratio *
2188 tbl->expected_tpt[index] + 64) / 128);
2189 }
2190
2191 /* If we are searching for better modulation mode, check success. */
2192 if (lq_sta->search_better_tbl) {
2193 /* If good success, continue using the "search" mode;
2194 * no need to send new link quality command, since we're
2195 * continuing to use the setup that we've been trying. */
2196 if (window->average_tpt > lq_sta->last_tpt) {
2197 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2198 "SWITCHING TO NEW TABLE SR: %d "
2199 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2200 window->success_ratio,
2201 window->average_tpt,
2202 lq_sta->last_tpt);
2203
8ca151b5
JB		 2204 /* Swap tables; "search" becomes "active" */
2205 lq_sta->active_tbl = active_tbl;
2206 current_tpt = window->average_tpt;
2207 /* Else poor success; go back to mode in "active" table */
2208 } else {
2209 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2210 "GOING BACK TO THE OLD TABLE: SR %d "
2211 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2212 window->success_ratio,
2213 window->average_tpt,
2214 lq_sta->last_tpt);
2215
2216 /* Nullify "search" table */
5aa33553 2217 rate->type = LQ_NONE;
8ca151b5
JB		 2218
2219 /* Revert to "active" table */
2220 active_tbl = lq_sta->active_tbl;
2221 tbl = &(lq_sta->lq_info[active_tbl]);
2222
2223 /* Revert to "active" rate and throughput info */
8fc7c58c 2224 index = tbl->rate.index;
8ca151b5
JB		 2225 current_tpt = lq_sta->last_tpt;
2226
2227 /* Need to set up a new rate table in uCode */
2228 update_lq = 1;
2229 }
2230
2231 /* Either way, we've made a decision; modulation mode
2232 * search is done, allow rate adjustment next time. */
2233 lq_sta->search_better_tbl = 0;
2234 done_search = 1; /* Don't switch modes below! */
2235 goto lq_update;
2236 }
2237
2238 /* (Else) not in search of better modulation mode, try for better
2239 * starting rate, while staying in this mode. */
ca6f38ff 2240 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
8ca151b5
JB		 2241 low = high_low & 0xff;
2242 high = (high_low >> 8) & 0xff;
2243
2536e7c3 2244 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2245
2246 sr = window->success_ratio;
2247
2248 /* Collect measured throughputs for current and adjacent rates */
2249 current_tpt = window->average_tpt;
2250 if (low != IWL_RATE_INVALID)
2251 low_tpt = tbl->win[low].average_tpt;
2252 if (high != IWL_RATE_INVALID)
2253 high_tpt = tbl->win[high].average_tpt;
2254
4d30ee82
ES		 2255 IWL_DEBUG_RATE(mvm,
2256 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
5aa33553
ES		 2257 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2258 low, high, low_tpt, high_tpt);
4d30ee82 2259
4e4b815c
ES		 2260 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2261 current_tpt, low_tpt, high_tpt);
8ca151b5 2262
393b9e5b 2263 /* Force a search in case BT doesn't like us being in MIMO */
5aa33553 2264 if (is_mimo(rate) &&
393b9e5b 2265 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
4d30ee82
ES		 2266 IWL_DEBUG_RATE(mvm,
2267 "BT Coex forbids MIMO. Search for new config\n");
36946ce6
EG		 2268 rs_stay_in_table(lq_sta, true);
2269 goto lq_update;
2270 }
2271
8ca151b5 2272 switch (scale_action) {
4e4b815c 2273 case RS_ACTION_DOWNSCALE:
8ca151b5
JB		 2274 /* Decrease starting rate, update uCode's rate table */
2275 if (low != IWL_RATE_INVALID) {
2276 update_lq = 1;
2277 index = low;
4d30ee82
ES		 2278 } else {
2279 IWL_DEBUG_RATE(mvm,
2280 "At the bottom rate. Can't decrease\n");
8ca151b5
JB		 2281 }
2282
2283 break;
4e4b815c 2284 case RS_ACTION_UPSCALE:
8ca151b5
JB		 2285 /* Increase starting rate, update uCode's rate table */
2286 if (high != IWL_RATE_INVALID) {
2287 update_lq = 1;
2288 index = high;
4d30ee82
ES		 2289 } else {
2290 IWL_DEBUG_RATE(mvm,
2291 "At the top rate. Can't increase\n");
8ca151b5
JB		 2292 }
2293
2294 break;
4e4b815c 2295 case RS_ACTION_STAY:
8ca151b5 2296 /* No change */
e6c8d602
ES		 2297 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2298 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2fd647f8 2299 break;
8ca151b5
JB		 2300 default:
2301 break;
2302 }
2303
8ca151b5
JB		 2304lq_update:
2305 /* Replace uCode's rate table for the destination station. */
5aa33553
ES		 2306 if (update_lq) {
2307 tbl->rate.index = index;
7b9d74e4 2308 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
5aa33553 2309 }
8ca151b5
JB		 2310
2311 rs_stay_in_table(lq_sta, false);
2312
2313 /*
2314 * Search for new modulation mode if we're:
2315 * 1) Not changing rates right now
2316 * 2) Not just finishing up a search
2317 * 3) Allowing a new search
2318 */
2319 if (!update_lq && !done_search &&
b3b06a32
ES		 2320 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2321 && window->counter) {
2322 enum rs_column next_column;
2323
8ca151b5
JB		 2324 /* Save current throughput to compare with "search" throughput*/
2325 lq_sta->last_tpt = current_tpt;
2326
4d30ee82 2327 IWL_DEBUG_RATE(mvm,
b3b06a32
ES		 2328 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2329 update_lq, done_search, lq_sta->rs_state,
4d30ee82 2330 window->counter);
b3b06a32
ES		 2331
2332 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2333 if (next_column != RS_COLUMN_INVALID) {
2334 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2335 next_column);
2336 if (!ret)
2337 lq_sta->search_better_tbl = 1;
2338 } else {
2339 IWL_DEBUG_RATE(mvm,
2340 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2341 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2342 }
8ca151b5
JB		 2343
2344 /* If new "search" mode was selected, set up in uCode table */
2345 if (lq_sta->search_better_tbl) {
2346 /* Access the "search" table, clear its history. */
2347 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b804eeb6 2348 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 2349
2350 /* Use new "search" start rate */
8fc7c58c 2351 index = tbl->rate.index;
8ca151b5 2352
b3b06a32
ES		 2353 rs_dump_rate(mvm, &tbl->rate,
2354 "Switch to SEARCH TABLE:");
7b9d74e4 2355 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
8ca151b5
JB		 2356 } else {
2357 done_search = 1;
2358 }
2359 }
2360
b3b06a32 2361 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
8ca151b5
JB		 2362 /* If the "active" (non-search) mode was legacy,
2363 * and we've tried switching antennas,
2364 * but we haven't been able to try HT modes (not available),
2365 * stay with best antenna legacy modulation for a while
2366 * before next round of mode comparisons. */
2367 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
fd7dbee5 2368 if (is_legacy(&tbl1->rate)) {
8ca151b5 2369 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
fd7dbee5
ES		 2370
2371 if (tid != IWL_MAX_TID_COUNT) {
2372 tid_data = &sta_priv->tid_data[tid];
2373 if (tid_data->state != IWL_AGG_OFF) {
2374 IWL_DEBUG_RATE(mvm,
2375 "Stop aggregation on tid %d\n",
2376 tid);
2377 ieee80211_stop_tx_ba_session(sta, tid);
2378 }
2379 }
8ca151b5 2380 rs_set_stay_in_table(mvm, 1, lq_sta);
b3b06a32 2381 } else {
8ca151b5
JB		 2382 /* If we're in an HT mode, and all 3 mode switch actions
2383 * have been tried and compared, stay in this best modulation
2384 * mode for a while before next round of mode comparisons. */
8ca151b5
JB		 2385 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2386 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2387 (tid != IWL_MAX_TID_COUNT)) {
2388 tid_data = &sta_priv->tid_data[tid];
2389 if (tid_data->state == IWL_AGG_OFF) {
2390 IWL_DEBUG_RATE(mvm,
2391 "try to aggregate tid %d\n",
2392 tid);
2393 rs_tl_turn_on_agg(mvm, tid,
2394 lq_sta, sta);
2395 }
2396 }
2397 rs_set_stay_in_table(mvm, 0, lq_sta);
2398 }
2399 }
2400
2401out:
8ca151b5
JB		 2402 lq_sta->last_txrate_idx = index;
2403}
2404
361dbec8
ES		 2405struct rs_init_rate_info {
2406 s8 rssi;
2407 u8 rate_idx;
2408};
2409
2410static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2411 { -60, IWL_RATE_54M_INDEX },
2412 { -64, IWL_RATE_48M_INDEX },
2413 { -68, IWL_RATE_36M_INDEX },
2414 { -80, IWL_RATE_24M_INDEX },
2415 { -84, IWL_RATE_18M_INDEX },
2416 { -85, IWL_RATE_12M_INDEX },
2417 { -86, IWL_RATE_11M_INDEX },
2418 { -88, IWL_RATE_5M_INDEX },
2419 { -90, IWL_RATE_2M_INDEX },
2420 { S8_MIN, IWL_RATE_1M_INDEX },
2421};
2422
2423static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2424 { -60, IWL_RATE_54M_INDEX },
2425 { -64, IWL_RATE_48M_INDEX },
2426 { -72, IWL_RATE_36M_INDEX },
2427 { -80, IWL_RATE_24M_INDEX },
2428 { -84, IWL_RATE_18M_INDEX },
2429 { -85, IWL_RATE_12M_INDEX },
2430 { -87, IWL_RATE_9M_INDEX },
2431 { S8_MIN, IWL_RATE_6M_INDEX },
2432};
2433
2434/* Choose an initial legacy rate and antenna to use based on the RSSI
2435 * of last Rx
2436 */
2437static void rs_get_initial_rate(struct iwl_mvm *mvm,
2438 struct iwl_lq_sta *lq_sta,
2439 enum ieee80211_band band,
2440 struct rs_rate *rate)
2441{
2442 int i, nentries;
2443 s8 best_rssi = S8_MIN;
2444 u8 best_ant = ANT_NONE;
a0544272 2445 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
361dbec8
ES		 2446 const struct rs_init_rate_info *initial_rates;
2447
2448 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2449 if (!(lq_sta->pers.chains & BIT(i)))
2450 continue;
2451
2452 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2453 best_rssi = lq_sta->pers.chain_signal[i];
2454 best_ant = BIT(i);
2455 }
2456 }
2457
2458 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2459 rs_pretty_ant(best_ant), best_rssi);
2460
2461 if (best_ant != ANT_A && best_ant != ANT_B)
2462 rate->ant = first_antenna(valid_tx_ant);
2463 else
2464 rate->ant = best_ant;
2465
2466 rate->sgi = false;
2467 rate->ldpc = false;
2468 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2469
2470 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2471 BITS_PER_LONG);
2472
2473 if (band == IEEE80211_BAND_5GHZ) {
2474 rate->type = LQ_LEGACY_A;
2475 initial_rates = rs_init_rates_5ghz;
2476 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2477 } else {
2478 rate->type = LQ_LEGACY_G;
2479 initial_rates = rs_init_rates_24ghz;
2480 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2481 }
2482
2483 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2484 for (i = 0; i < nentries; i++) {
2485 int rate_idx = initial_rates[i].rate_idx;
2486 if ((best_rssi >= initial_rates[i].rssi) &&
2487 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2488 rate->index = rate_idx;
2489 break;
2490 }
2491 }
2492 }
2493
2494 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2495 rs_pretty_ant(rate->ant));
2496}
2497
2498/* Save info about RSSI of last Rx */
2499void rs_update_last_rssi(struct iwl_mvm *mvm,
2500 struct iwl_lq_sta *lq_sta,
2501 struct ieee80211_rx_status *rx_status)
2502{
2503 lq_sta->pers.chains = rx_status->chains;
2504 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2505 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2506 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2507}
2508
8ca151b5
JB		 2509/**
2510 * rs_initialize_lq - Initialize a station's hardware rate table
2511 *
2512 * The uCode's station table contains a table of fallback rates
2513 * for automatic fallback during transmission.
2514 *
2515 * NOTE: This sets up a default set of values. These will be replaced later
2516 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2517 * rc80211_simple.
2518 *
2519 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2520 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2521 * which requires station table entry to exist).
2522 */
2523static void rs_initialize_lq(struct iwl_mvm *mvm,
2524 struct ieee80211_sta *sta,
2525 struct iwl_lq_sta *lq_sta,
b87c2179
ES		 2526 enum ieee80211_band band,
2527 bool init)
8ca151b5
JB		 2528{
2529 struct iwl_scale_tbl_info *tbl;
5aa33553 2530 struct rs_rate *rate;
8ca151b5 2531 u8 active_tbl = 0;
8ca151b5
JB		 2532
2533 if (!sta || !lq_sta)
2534 return;
2535
8ca151b5
JB		 2536 if (!lq_sta->search_better_tbl)
2537 active_tbl = lq_sta->active_tbl;
2538 else
2539 active_tbl = 1 - lq_sta->active_tbl;
2540
2541 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2542 rate = &tbl->rate;
8ca151b5 2543
361dbec8
ES		 2544 rs_get_initial_rate(mvm, lq_sta, band, rate);
2545 lq_sta->last_txrate_idx = rate->index;
8ca151b5 2546
b3b06a32
ES		 2547 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2548 if (rate->ant == ANT_A)
2549 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2550 else
2551 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2552
8ca151b5 2553 rs_set_expected_tpt_table(lq_sta, tbl);
80e9e5cd 2554 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
8ca151b5 2555 /* TODO restore station should remember the lq cmd */
b87c2179 2556 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
8ca151b5
JB		 2557}
2558
2559static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2560 struct ieee80211_tx_rate_control *txrc)
2561{
2562 struct sk_buff *skb = txrc->skb;
8ca151b5
JB		 2563 struct iwl_op_mode *op_mode __maybe_unused =
2564 (struct iwl_op_mode *)mvm_r;
2565 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2566 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2567 struct iwl_lq_sta *lq_sta = mvm_sta;
8ca151b5 2568
2536e7c3 2569 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2570
2571 /* Treat uninitialized rate scaling data same as non-existing. */
ae969afe 2572 if (lq_sta && !lq_sta->pers.drv) {
8ca151b5
JB		 2573 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2574 mvm_sta = NULL;
2575 }
2576
2577 /* Send management frames and NO_ACK data using lowest rate. */
2578 if (rate_control_send_low(sta, mvm_sta, txrc))
2579 return;
2580
d310e405
ES		 2581 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2582 info->band, &info->control.rates[0]);
2583
622ebe99 2584 info->control.rates[0].count = 1;
8ca151b5
JB		 2585}
2586
2587static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2588 gfp_t gfp)
2589{
9d8ce6af 2590 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
ae969afe
EP		 2591 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2592 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2593 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
8ca151b5
JB		 2594
2595 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2596
ae969afe
EP		 2597 lq_sta->pers.drv = mvm;
2598#ifdef CONFIG_MAC80211_DEBUGFS
2599 lq_sta->pers.dbg_fixed_rate = 0;
2600 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
878985ce 2601 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
ae969afe 2602#endif
361dbec8
ES		 2603 lq_sta->pers.chains = 0;
2604 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
ae969afe 2605
8ca151b5
JB		 2606 return &sta_priv->lq_sta;
2607}
2608
d310e405
ES		 2609static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2610 int nss)
2611{
2612 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2613 (0x3 << (2 * (nss - 1)));
2614 rx_mcs >>= (2 * (nss - 1));
2615
2616 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2617 return IWL_RATE_MCS_7_INDEX;
2618 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2619 return IWL_RATE_MCS_8_INDEX;
2620 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2621 return IWL_RATE_MCS_9_INDEX;
2622
2623 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2624 return -1;
2625}
2626
750a1b45
ES		 2627static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2628 struct ieee80211_sta_vht_cap *vht_cap,
2629 struct iwl_lq_sta *lq_sta)
2630{
2631 int i;
2632 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2633
2634 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2635 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2636 if (i == IWL_RATE_9M_INDEX)
2637 continue;
2638
271518ad
ES		 2639 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2640 if (i == IWL_RATE_MCS_9_INDEX &&
2641 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2642 continue;
2643
750a1b45
ES		 2644 lq_sta->active_siso_rate |= BIT(i);
2645 }
2646 }
2647
ecc90e79
ES		 2648 if (sta->rx_nss < 2)
2649 return;
2650
750a1b45
ES		 2651 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2652 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2653 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2654 if (i == IWL_RATE_9M_INDEX)
2655 continue;
2656
271518ad
ES		 2657 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2658 if (i == IWL_RATE_MCS_9_INDEX &&
2659 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2660 continue;
2661
750a1b45
ES		 2662 lq_sta->active_mimo2_rate |= BIT(i);
2663 }
2664 }
2665}
2666
2f15a829
JB		 2667static void rs_ht_init(struct iwl_mvm *mvm,
2668 struct ieee80211_sta *sta,
2669 struct iwl_lq_sta *lq_sta,
2670 struct ieee80211_sta_ht_cap *ht_cap)
2671{
2672 /* active_siso_rate mask includes 9 MBits (bit 5),
2673 * and CCK (bits 0-3), supp_rates[] does not;
2674 * shift to convert format, force 9 MBits off.
2675 */
2676 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2677 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2678 lq_sta->active_siso_rate &= ~((u16)0x2);
2679 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2680
2681 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2682 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2683 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2684 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2685
2686 if (mvm->cfg->ht_params->ldpc &&
2687 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2688 lq_sta->ldpc = true;
2689
2690 if (mvm->cfg->ht_params->stbc &&
2691 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2692 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3d44eebf 2693 lq_sta->stbc_capable = true;
2f15a829
JB		 2694
2695 lq_sta->is_vht = false;
2696}
2697
2698static void rs_vht_init(struct iwl_mvm *mvm,
2699 struct ieee80211_sta *sta,
2700 struct iwl_lq_sta *lq_sta,
2701 struct ieee80211_sta_vht_cap *vht_cap)
2702{
2703 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2704
2705 if (mvm->cfg->ht_params->ldpc &&
2706 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2707 lq_sta->ldpc = true;
2708
2709 if (mvm->cfg->ht_params->stbc &&
2710 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2711 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3d44eebf
ES		 2712 lq_sta->stbc_capable = true;
2713
2714 if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2715 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2716 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2717 lq_sta->bfer_capable = true;
2f15a829
JB		 2718
2719 lq_sta->is_vht = true;
2720}
2721
5fc0f76c 2722#ifdef CONFIG_IWLWIFI_DEBUGFS
2f15a829 2723static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
5fc0f76c
ES		 2724{
2725 spin_lock_bh(&mvm->drv_stats_lock);
2f15a829 2726 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
5fc0f76c
ES		 2727 spin_unlock_bh(&mvm->drv_stats_lock);
2728}
2729
2f15a829 2730void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
5fc0f76c
ES		 2731{
2732 u8 nss = 0, mcs = 0;
2733
2734 spin_lock(&mvm->drv_stats_lock);
2735
2736 if (agg)
2f15a829 2737 mvm->drv_rx_stats.agg_frames++;
5fc0f76c 2738
2f15a829 2739 mvm->drv_rx_stats.success_frames++;
5fc0f76c
ES		 2740
2741 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2742 case RATE_MCS_CHAN_WIDTH_20:
2f15a829 2743 mvm->drv_rx_stats.bw_20_frames++;
5fc0f76c
ES		 2744 break;
2745 case RATE_MCS_CHAN_WIDTH_40:
2f15a829 2746 mvm->drv_rx_stats.bw_40_frames++;
5fc0f76c
ES		 2747 break;
2748 case RATE_MCS_CHAN_WIDTH_80:
2f15a829 2749 mvm->drv_rx_stats.bw_80_frames++;
5fc0f76c
ES		 2750 break;
2751 default:
2752 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2753 }
2754
2755 if (rate & RATE_MCS_HT_MSK) {
2f15a829 2756 mvm->drv_rx_stats.ht_frames++;
5fc0f76c
ES		 2757 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2758 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2759 } else if (rate & RATE_MCS_VHT_MSK) {
2f15a829 2760 mvm->drv_rx_stats.vht_frames++;
5fc0f76c
ES		 2761 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2762 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2763 RATE_VHT_MCS_NSS_POS) + 1;
2764 } else {
2f15a829 2765 mvm->drv_rx_stats.legacy_frames++;
5fc0f76c
ES		 2766 }
2767
2768 if (nss == 1)
2f15a829 2769 mvm->drv_rx_stats.siso_frames++;
5fc0f76c 2770 else if (nss == 2)
2f15a829 2771 mvm->drv_rx_stats.mimo2_frames++;
5fc0f76c
ES		 2772
2773 if (rate & RATE_MCS_SGI_MSK)
2f15a829 2774 mvm->drv_rx_stats.sgi_frames++;
5fc0f76c 2775 else
2f15a829 2776 mvm->drv_rx_stats.ngi_frames++;
5fc0f76c 2777
2f15a829
JB		 2778 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2779 mvm->drv_rx_stats.last_frame_idx =
2780 (mvm->drv_rx_stats.last_frame_idx + 1) %
2781 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
5fc0f76c
ES		 2782
2783 spin_unlock(&mvm->drv_stats_lock);
2784}
2785#endif
2786
8ca151b5
JB		 2787/*
2788 * Called after adding a new station to initialize rate scaling
2789 */
2790void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
b87c2179 2791 enum ieee80211_band band, bool init)
8ca151b5
JB		 2792{
2793 int i, j;
2794 struct ieee80211_hw *hw = mvm->hw;
2795 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
d310e405 2796 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
9d8ce6af
JB		 2797 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2798 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
8ca151b5
JB		 2799 struct ieee80211_supported_band *sband;
2800 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2801
ae969afe
EP		 2802 /* clear all non-persistent lq data */
2803 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
b87c2179 2804
8ca151b5
JB		 2805 sband = hw->wiphy->bands[band];
2806
2807 lq_sta->lq.sta_id = sta_priv->sta_id;
2808
2809 for (j = 0; j < LQ_SIZE; j++)
b804eeb6 2810 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
8ca151b5
JB		 2811
2812 lq_sta->flush_timer = 0;
87d5e415 2813 lq_sta->last_tx = jiffies;
8ca151b5
JB		 2814
2815 IWL_DEBUG_RATE(mvm,
2816 "LQ: *** rate scale station global init for station %d ***\n",
2817 sta_priv->sta_id);
2818 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2819 * the lowest or the highest rate.. Could consider using RSSI from
2820 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2821 * after assoc.. */
2822
834437da 2823 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
8ca151b5
JB		 2824 lq_sta->band = sband->band;
2825 /*
2826 * active legacy rates as per supported rates bitmap
2827 */
2828 supp = sta->supp_rates[sband->band];
2829 lq_sta->active_legacy_rate = 0;
2830 for_each_set_bit(i, &supp, BITS_PER_LONG)
2831 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2832
d310e405 2833 /* TODO: should probably account for rx_highest for both HT/VHT */
2c59d80c
ES		 2834 if (!vht_cap || !vht_cap->vht_supported)
2835 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2836 else
2837 rs_vht_init(mvm, sta, lq_sta, vht_cap);
8ca151b5 2838
afe08e1c 2839 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
dc574e52
ES		 2840 lq_sta->active_mimo2_rate = 0;
2841
6a028d9a
ES		 2842 lq_sta->max_legacy_rate_idx =
2843 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2844 lq_sta->max_siso_rate_idx =
2845 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2846 lq_sta->max_mimo2_rate_idx =
2847 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
198266a3 2848
a3576ff2 2849 IWL_DEBUG_RATE(mvm,
3d44eebf 2850 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
198266a3 2851 lq_sta->active_legacy_rate,
8ca151b5 2852 lq_sta->active_siso_rate,
d310e405 2853 lq_sta->active_mimo2_rate,
3d44eebf
ES		 2854 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2855 lq_sta->bfer_capable);
198266a3
ES		 2856 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2857 lq_sta->max_legacy_rate_idx,
2858 lq_sta->max_siso_rate_idx,
2859 lq_sta->max_mimo2_rate_idx);
8ca151b5
JB		 2860
2861 /* These values will be overridden later */
2862 lq_sta->lq.single_stream_ant_msk =
a0544272 2863 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
809bccfa 2864 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
8ca151b5
JB		 2865
2866 /* as default allow aggregation for all tids */
2867 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
8ca151b5 2868 lq_sta->is_agg = 0;
5fc0f76c 2869#ifdef CONFIG_IWLWIFI_DEBUGFS
2f15a829 2870 iwl_mvm_reset_frame_stats(mvm);
5fc0f76c 2871#endif
b87c2179
ES		 2872 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2873}
2874
2875static void rs_rate_update(void *mvm_r,
2876 struct ieee80211_supported_band *sband,
2877 struct cfg80211_chan_def *chandef,
2878 struct ieee80211_sta *sta, void *priv_sta,
2879 u32 changed)
2880{
2881 u8 tid;
2882 struct iwl_op_mode *op_mode =
2883 (struct iwl_op_mode *)mvm_r;
2884 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2885
2886 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2887 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2888 ieee80211_stop_tx_ba_session(sta, tid);
2889
2890 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
8ca151b5
JB		 2891}
2892
8fc7c58c
ES		 2893#ifdef CONFIG_MAC80211_DEBUGFS
2894static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2895 struct iwl_lq_cmd *lq_cmd,
2896 enum ieee80211_band band,
2897 u32 ucode_rate)
2898{
2899 struct rs_rate rate;
2900 int i;
2901 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2902 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
7ceb98a3 2903 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
8fc7c58c
ES		 2904
2905 for (i = 0; i < num_rates; i++)
2906 lq_cmd->rs_table[i] = ucode_rate_le32;
2907
2908 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2909
2910 if (is_mimo(&rate))
2911 lq_cmd->mimo_delim = num_rates - 1;
2912 else
2913 lq_cmd->mimo_delim = 0;
7ceb98a3
EG		 2914
2915 lq_cmd->reduced_tpc = 0;
2916
2917 if (num_of_ant(ant) == 1)
2918 lq_cmd->single_stream_ant_msk = ant;
2919
2920 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
8fc7c58c
ES		 2921}
2922#endif /* CONFIG_MAC80211_DEBUGFS */
2923
e07be6d3
ES		 2924static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2925 struct iwl_lq_sta *lq_sta,
2926 struct rs_rate *rate,
2927 __le32 *rs_table, int *rs_table_index,
2928 int num_rates, int num_retries,
2929 u8 valid_tx_ant, bool toggle_ant)
2930{
2931 int i, j;
2932 __le32 ucode_rate;
2933 bool bottom_reached = false;
2934 int prev_rate_idx = rate->index;
2935 int end = LINK_QUAL_MAX_RETRY_NUM;
2936 int index = *rs_table_index;
2937
2938 for (i = 0; i < num_rates && index < end; i++) {
bd999318
ES		 2939 for (j = 0; j < num_retries && index < end; j++, index++) {
2940 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2941 rate));
e07be6d3 2942 rs_table[index] = ucode_rate;
bd999318
ES		 2943 if (toggle_ant)
2944 rs_toggle_antenna(valid_tx_ant, rate);
2945 }
e07be6d3
ES		 2946
2947 prev_rate_idx = rate->index;
2948 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2949 if (bottom_reached && !is_legacy(rate))
2950 break;
2951 }
2952
bd999318 2953 if (!bottom_reached && !is_legacy(rate))
e07be6d3
ES		 2954 rate->index = prev_rate_idx;
2955
2956 *rs_table_index = index;
2957}
2958
2959/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2960 * column the rate table should look like this:
2961 *
2962 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2963 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2964 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2965 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2966 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2967 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2968 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2969 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2970 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2971 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2972 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2973 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2974 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2975 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2976 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2977 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2978 */
8fc7c58c 2979static void rs_build_rates_table(struct iwl_mvm *mvm,
d8bafeaf 2980 struct ieee80211_sta *sta,
8fc7c58c
ES		 2981 struct iwl_lq_sta *lq_sta,
2982 const struct rs_rate *initial_rate)
8ca151b5 2983{
5aa33553 2984 struct rs_rate rate;
e07be6d3 2985 int num_rates, num_retries, index = 0;
8ca151b5
JB		 2986 u8 valid_tx_ant = 0;
2987 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
e07be6d3 2988 bool toggle_ant = false;
8ca151b5 2989
9e898f1b 2990 memcpy(&rate, initial_rate, sizeof(rate));
8fc7c58c 2991
a0544272 2992 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
c5d679a5 2993
3d44eebf
ES		 2994 /* TODO: remove old API when min FW API hits 14 */
2995 if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
2996 rs_stbc_allow(mvm, sta, lq_sta))
2997 rate.stbc = true;
8ca151b5 2998
e07be6d3 2999 if (is_siso(&rate)) {
834437da
ES		 3000 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3001 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
e07be6d3 3002 } else if (is_mimo(&rate)) {
834437da
ES		 3003 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3004 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
8ca151b5 3005 } else {
834437da 3006 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
bd999318 3007 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
e07be6d3 3008 toggle_ant = true;
8ca151b5
JB		 3009 }
3010
e07be6d3
ES		 3011 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3012 num_rates, num_retries, valid_tx_ant,
3013 toggle_ant);
8ca151b5 3014
e07be6d3 3015 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 3016
e07be6d3 3017 if (is_siso(&rate)) {
834437da
ES		 3018 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3019 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
d9088f60 3020 lq_cmd->mimo_delim = index;
e07be6d3 3021 } else if (is_legacy(&rate)) {
834437da 3022 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
bd999318 3023 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
e07be6d3
ES		 3024 } else {
3025 WARN_ON_ONCE(1);
3026 }
8ca151b5 3027
e07be6d3 3028 toggle_ant = true;
8ca151b5 3029
e07be6d3
ES		 3030 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3031 num_rates, num_retries, valid_tx_ant,
3032 toggle_ant);
8ca151b5 3033
e07be6d3 3034 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 3035
834437da 3036 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
bd999318 3037 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
8ca151b5 3038
e07be6d3
ES		 3039 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3040 num_rates, num_retries, valid_tx_ant,
3041 toggle_ant);
8ca151b5 3042
8fc7c58c
ES		 3043}
3044
3d44eebf
ES		 3045struct rs_bfer_active_iter_data {
3046 struct ieee80211_sta *exclude_sta;
3047 struct iwl_mvm_sta *bfer_mvmsta;
3048};
3049
3050static void rs_bfer_active_iter(void *_data,
3051 struct ieee80211_sta *sta)
3052{
3053 struct rs_bfer_active_iter_data *data = _data;
3054 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3055 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3056 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3057
3058 if (sta == data->exclude_sta)
3059 return;
3060
3061 /* The current sta has BFER allowed */
3062 if (ss_params & LQ_SS_BFER_ALLOWED) {
3063 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3064
3065 data->bfer_mvmsta = mvmsta;
3066 }
3067}
3068
3069static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3070{
3071 int prio = -1;
3072 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3073
3074 switch (viftype) {
3075 case NL80211_IFTYPE_AP:
3076 case NL80211_IFTYPE_P2P_GO:
3077 prio = 3;
3078 break;
3079 case NL80211_IFTYPE_P2P_CLIENT:
3080 prio = 2;
3081 break;
3082 case NL80211_IFTYPE_STATION:
3083 prio = 1;
3084 break;
3085 default:
3086 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3087 prio = -1;
3088 }
3089
3090 return prio;
3091}
3092
3093/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3094static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3095 struct iwl_mvm_sta *sta2)
3096{
3097 int prio1 = rs_bfer_priority(sta1);
3098 int prio2 = rs_bfer_priority(sta2);
3099
3100 if (prio1 > prio2)
3101 return 1;
3102 if (prio1 < prio2)
3103 return -1;
3104 return 0;
3105}
3106
3107static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3108 struct ieee80211_sta *sta,
3109 struct iwl_lq_sta *lq_sta,
3110 const struct rs_rate *initial_rate)
3111{
3112 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3113 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3114 struct rs_bfer_active_iter_data data = {
3115 .exclude_sta = sta,
3116 .bfer_mvmsta = NULL,
3117 };
3118 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3119 u32 ss_params = LQ_SS_PARAMS_VALID;
3120
3121 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3122 goto out;
3123
878985ce 3124#ifdef CONFIG_MAC80211_DEBUGFS
1e9c62fa
ES		 3125 /* Check if forcing the decision is configured.
3126 * Note that SISO is forced by not allowing STBC or BFER
3127 */
878985ce 3128 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
1e9c62fa 3129 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
878985ce 3130 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
1e9c62fa
ES		 3131 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3132
878985ce 3133 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
1e9c62fa 3134 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
878985ce 3135 lq_sta->pers.ss_force);
1e9c62fa
ES		 3136 goto out;
3137 }
878985ce 3138#endif
1e9c62fa 3139
3d44eebf
ES		 3140 if (lq_sta->stbc_capable)
3141 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3142
3143 if (!lq_sta->bfer_capable)
3144 goto out;
3145
3146 ieee80211_iterate_stations_atomic(mvm->hw,
3147 rs_bfer_active_iter,
3148 &data);
3149 bfer_mvmsta = data.bfer_mvmsta;
3150
3151 /* This code is safe as it doesn't run concurrently for different
3152 * stations. This is guaranteed by the fact that calls to
3153 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3154 */
3155 if (!bfer_mvmsta) {
3156 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3157
3158 ss_params |= LQ_SS_BFER_ALLOWED;
3159 goto out;
3160 }
3161
3162 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3163 bfer_mvmsta->sta_id);
3164
3165 /* Disallow BFER on another STA if active and we're a higher priority */
3166 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3167 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3168 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3169
3170 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3171 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3172 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3173
3174 ss_params |= LQ_SS_BFER_ALLOWED;
3175 IWL_DEBUG_RATE(mvm,
3176 "Lower priority BFER sta found (%d). Switch BFER\n",
3177 bfer_mvmsta->sta_id);
3178 }
3179out:
3180 lq_cmd->ss_params = cpu_to_le32(ss_params);
3181}
3182
8fc7c58c
ES		 3183static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3184 struct ieee80211_sta *sta,
3185 struct iwl_lq_sta *lq_sta,
3186 const struct rs_rate *initial_rate)
3187{
3188 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
7ceb98a3
EG		 3189 struct iwl_mvm_sta *mvmsta;
3190 struct iwl_mvm_vif *mvmvif;
3191
834437da 3192 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
7ceb98a3 3193 lq_cmd->agg_time_limit =
834437da 3194 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
8fc7c58c
ES		 3195
3196#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 3197 if (lq_sta->pers.dbg_fixed_rate) {
8fc7c58c
ES		 3198 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3199 lq_sta->band,
ae969afe 3200 lq_sta->pers.dbg_fixed_rate);
7ceb98a3
EG		 3201 return;
3202 }
8fc7c58c 3203#endif
7ceb98a3
EG		 3204 if (WARN_ON_ONCE(!sta || !initial_rate))
3205 return;
8fc7c58c 3206
d8bafeaf 3207 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
8ca151b5 3208
3d44eebf
ES		 3209 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3210 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3211
7ceb98a3
EG		 3212 if (num_of_ant(initial_rate->ant) == 1)
3213 lq_cmd->single_stream_ant_msk = initial_rate->ant;
8ca151b5 3214
7ceb98a3
EG		 3215 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3216 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
e96d551f 3217
7ceb98a3
EG		 3218 if (num_of_ant(initial_rate->ant) == 1)
3219 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3220
3221 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3222
3223 /*
3224 * In case of low latency, tell the firwmare to leave a frame in the
3225 * Tx Fifo so that it can start a transaction in the same TxOP. This
3226 * basically allows the firmware to send bursts.
3227 */
9ecd051e 3228 if (iwl_mvm_vif_low_latency(mvmvif)) {
7ceb98a3
EG		 3229 lq_cmd->agg_frame_cnt_limit--;
3230
9ecd051e
ES		 3231 if (mvm->low_latency_agg_frame_limit)
3232 lq_cmd->agg_frame_cnt_limit =
3233 min(lq_cmd->agg_frame_cnt_limit,
3234 mvm->low_latency_agg_frame_limit);
3235 }
3236
a4db848f
EG		 3237 if (mvmsta->vif->p2p)
3238 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3239
7ceb98a3 3240 lq_cmd->agg_time_limit =
5b7ff615 3241 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
8ca151b5
JB		 3242}
3243
3244static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3245{
3246 return hw->priv;
3247}
3248/* rate scale requires free function to be implemented */
3249static void rs_free(void *mvm_rate)
3250{
3251 return;
3252}
3253
3254static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3255 void *mvm_sta)
3256{
3257 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3258 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3259
3260 IWL_DEBUG_RATE(mvm, "enter\n");
3261 IWL_DEBUG_RATE(mvm, "leave\n");
3262}
3263
3264#ifdef CONFIG_MAC80211_DEBUGFS
5fc0f76c 3265int rs_pretty_print_rate(char *buf, const u32 rate)
5aa33553
ES		 3266{
3267
1a61b347
ES		 3268 char *type, *bw;
3269 u8 mcs = 0, nss = 0;
3270 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3271
3272 if (!(rate & RATE_MCS_HT_MSK) &&
3273 !(rate & RATE_MCS_VHT_MSK)) {
3274 int index = iwl_hwrate_to_plcp_idx(rate);
3275
3276 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
560843f4
ES		 3277 rs_pretty_ant(ant),
3278 index == IWL_RATE_INVALID ? "BAD" :
3279 iwl_rate_mcs[index].mbps);
1a61b347
ES		 3280 }
3281
3282 if (rate & RATE_MCS_VHT_MSK) {
3283 type = "VHT";
3284 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3285 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3286 >> RATE_VHT_MCS_NSS_POS) + 1;
3287 } else if (rate & RATE_MCS_HT_MSK) {
3288 type = "HT";
3289 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3290 } else {
3291 type = "Unknown"; /* shouldn't happen */
3292 }
3293
3294 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3295 case RATE_MCS_CHAN_WIDTH_20:
3296 bw = "20Mhz";
3297 break;
3298 case RATE_MCS_CHAN_WIDTH_40:
3299 bw = "40Mhz";
3300 break;
3301 case RATE_MCS_CHAN_WIDTH_80:
3302 bw = "80Mhz";
3303 break;
3304 case RATE_MCS_CHAN_WIDTH_160:
3305 bw = "160Mhz";
3306 break;
3307 default:
3308 bw = "BAD BW";
3309 }
3310
3311 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
5aa33553 3312 type, rs_pretty_ant(ant), bw, mcs, nss,
1a61b347 3313 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
7b1dd048 3314 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
1a61b347
ES		 3315 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3316 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3317 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3318}
3319
a0c38b21
ES		 3320/**
3321 * Program the device to use fixed rate for frame transmit
3322 * This is for debugging/testing only
3323 * once the device start use fixed rate, we need to reload the module
3324 * to being back the normal operation.
3325 */
3326static void rs_program_fix_rate(struct iwl_mvm *mvm,
3327 struct iwl_lq_sta *lq_sta)
3328{
3329 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3330 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3331 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3332
3333 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
ae969afe 3334 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
a0c38b21 3335
ae969afe 3336 if (lq_sta->pers.dbg_fixed_rate) {
7ceb98a3 3337 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
ae969afe 3338 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
a0c38b21
ES		 3339 }
3340}
3341
9d10849e
EG		 3342static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3343 const char __user *user_buf, size_t count, loff_t *ppos)
3344{
3345 struct iwl_lq_sta *lq_sta = file->private_data;
3346 struct iwl_mvm *mvm;
3347 char buf[64];
3348 size_t buf_size;
3349 u32 parsed_rate;
3350
ae969afe 3351 mvm = lq_sta->pers.drv;
9d10849e
EG		 3352 memset(buf, 0, sizeof(buf));
3353 buf_size = min(count, sizeof(buf) - 1);
3354 if (copy_from_user(buf, user_buf, buf_size))
3355 return -EFAULT;
3356
3357 if (sscanf(buf, "%x", &parsed_rate) == 1)
ae969afe 3358 lq_sta->pers.dbg_fixed_rate = parsed_rate;
9d10849e 3359 else
ae969afe 3360 lq_sta->pers.dbg_fixed_rate = 0;
9d10849e
EG		 3361
3362 rs_program_fix_rate(mvm, lq_sta);
3363
3364 return count;
3365}
3366
8ca151b5
JB		 3367static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3368 char __user *user_buf, size_t count, loff_t *ppos)
3369{
3370 char *buff;
3371 int desc = 0;
3372 int i = 0;
8ca151b5
JB		 3373 ssize_t ret;
3374
3375 struct iwl_lq_sta *lq_sta = file->private_data;
3376 struct iwl_mvm *mvm;
3377 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 3378 struct rs_rate *rate = &tbl->rate;
16c426ff 3379 u32 ss_params;
ae969afe 3380 mvm = lq_sta->pers.drv;
1a61b347 3381 buff = kmalloc(2048, GFP_KERNEL);
8ca151b5
JB		 3382 if (!buff)
3383 return -ENOMEM;
3384
3385 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
198266a3 3386 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
8ca151b5
JB		 3387 lq_sta->total_failed, lq_sta->total_success,
3388 lq_sta->active_legacy_rate);
3389 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
ae969afe 3390 lq_sta->pers.dbg_fixed_rate);
8ca151b5 3391 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
a0544272
MH		 3392 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3393 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3394 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
8ca151b5 3395 desc += sprintf(buff+desc, "lq type %s\n",
5aa33553
ES		 3396 (is_legacy(rate)) ? "legacy" :
3397 is_vht(rate) ? "VHT" : "HT");
3398 if (!is_legacy(rate)) {
e70fe7eb 3399 desc += sprintf(buff + desc, " %s",
5aa33553 3400 (is_siso(rate)) ? "SISO" : "MIMO2");
e70fe7eb
EG		 3401 desc += sprintf(buff + desc, " %s",
3402 (is_ht20(rate)) ? "20MHz" :
3403 (is_ht40(rate)) ? "40MHz" :
3404 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3405 desc += sprintf(buff + desc, " %s %s %s\n",
3406 (rate->sgi) ? "SGI" : "NGI",
3407 (rate->ldpc) ? "LDPC" : "BCC",
3408 (lq_sta->is_agg) ? "AGG on" : "");
8ca151b5
JB		 3409 }
3410 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3411 lq_sta->last_rate_n_flags);
3412 desc += sprintf(buff+desc,
1a61b347 3413 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
8ca151b5
JB		 3414 lq_sta->lq.flags,
3415 lq_sta->lq.mimo_delim,
3416 lq_sta->lq.single_stream_ant_msk,
3417 lq_sta->lq.dual_stream_ant_msk);
3418
3419 desc += sprintf(buff+desc,
3420 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3421 le16_to_cpu(lq_sta->lq.agg_time_limit),
3422 lq_sta->lq.agg_disable_start_th,
3423 lq_sta->lq.agg_frame_cnt_limit);
3424
2fd647f8 3425 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
16c426ff
ES		 3426 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3427 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3428 (ss_params & LQ_SS_PARAMS_VALID) ?
db7c689d 3429 "VALID" : "INVALID",
16c426ff 3430 (ss_params & LQ_SS_BFER_ALLOWED) ?
db7c689d 3431 ", BFER" : "",
16c426ff 3432 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
db7c689d 3433 ", STBC" : "",
16c426ff 3434 (ss_params & LQ_SS_FORCE) ?
db7c689d 3435 ", FORCE" : "");
8ca151b5
JB		 3436 desc += sprintf(buff+desc,
3437 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3438 lq_sta->lq.initial_rate_index[0],
3439 lq_sta->lq.initial_rate_index[1],
3440 lq_sta->lq.initial_rate_index[2],
3441 lq_sta->lq.initial_rate_index[3]);
3442
3443 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
cf4ef654 3444 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
1a61b347 3445
cf4ef654
JB		 3446 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3447 desc += rs_pretty_print_rate(buff+desc, r);
8ca151b5
JB		 3448 }
3449
3450 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3451 kfree(buff);
3452 return ret;
3453}
3454
3455static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3456 .write = rs_sta_dbgfs_scale_table_write,
3457 .read = rs_sta_dbgfs_scale_table_read,
3458 .open = simple_open,
3459 .llseek = default_llseek,
3460};
3461static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3462 char __user *user_buf, size_t count, loff_t *ppos)
3463{
3464 char *buff;
3465 int desc = 0;
3466 int i, j;
3467 ssize_t ret;
d310e405 3468 struct iwl_scale_tbl_info *tbl;
5aa33553 3469 struct rs_rate *rate;
8ca151b5
JB		 3470 struct iwl_lq_sta *lq_sta = file->private_data;
3471
3472 buff = kmalloc(1024, GFP_KERNEL);
3473 if (!buff)
3474 return -ENOMEM;
3475
3476 for (i = 0; i < LQ_SIZE; i++) {
d310e405 3477 tbl = &(lq_sta->lq_info[i]);
5aa33553 3478 rate = &tbl->rate;
8ca151b5 3479 desc += sprintf(buff+desc,
6a524f48 3480 "%s type=%d SGI=%d BW=%s DUP=0\n"
8fc7c58c 3481 "index=%d\n",
8ca151b5 3482 lq_sta->active_tbl == i ? "*" : "x",
5aa33553
ES		 3483 rate->type,
3484 rate->sgi,
3485 is_ht20(rate) ? "20Mhz" :
3486 is_ht40(rate) ? "40Mhz" :
3487 is_ht80(rate) ? "80Mhz" : "ERR",
8fc7c58c 3488 rate->index);
8ca151b5
JB		 3489 for (j = 0; j < IWL_RATE_COUNT; j++) {
3490 desc += sprintf(buff+desc,
3491 "counter=%d success=%d %%=%d\n",
d310e405
ES		 3492 tbl->win[j].counter,
3493 tbl->win[j].success_counter,
3494 tbl->win[j].success_ratio);
8ca151b5
JB		 3495 }
3496 }
3497 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3498 kfree(buff);
3499 return ret;
3500}
3501
3502static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3503 .read = rs_sta_dbgfs_stats_table_read,
3504 .open = simple_open,
3505 .llseek = default_llseek,
3506};
3507
757cf23b
ES		 3508static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3509 char __user *user_buf,
3510 size_t count, loff_t *ppos)
3511{
3512 static const char * const column_name[] = {
3513 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3514 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3515 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3516 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3517 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3518 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3519 [RS_COLUMN_MIMO2] = "MIMO2",
3520 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3521 };
3522
3523 static const char * const rate_name[] = {
3524 [IWL_RATE_1M_INDEX] = "1M",
3525 [IWL_RATE_2M_INDEX] = "2M",
3526 [IWL_RATE_5M_INDEX] = "5.5M",
3527 [IWL_RATE_11M_INDEX] = "11M",
3528 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3529 [IWL_RATE_9M_INDEX] = "9M",
3530 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3531 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3532 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3533 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3534 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3535 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3536 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3537 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3538 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3539 };
3540
3541 char *buff, *pos, *endpos;
3542 int col, rate;
3543 ssize_t ret;
3544 struct iwl_lq_sta *lq_sta = file->private_data;
3545 struct rs_rate_stats *stats;
3546 static const size_t bufsz = 1024;
3547
3548 buff = kmalloc(bufsz, GFP_KERNEL);
3549 if (!buff)
3550 return -ENOMEM;
3551
3552 pos = buff;
3553 endpos = pos + bufsz;
3554
3555 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3556 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3557 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3558 pos += scnprintf(pos, endpos - pos, "\n");
3559
3560 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3561 pos += scnprintf(pos, endpos - pos,
3562 "%s,", column_name[col]);
3563
3564 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
f58220f6 3565 stats = &(lq_sta->pers.tx_stats[col][rate]);
757cf23b
ES		 3566 pos += scnprintf(pos, endpos - pos,
3567 "%llu/%llu,",
3568 stats->success,
3569 stats->total);
3570 }
3571 pos += scnprintf(pos, endpos - pos, "\n");
3572 }
3573
3574 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3575 kfree(buff);
3576 return ret;
3577}
3578
3579static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3580 const char __user *user_buf,
3581 size_t count, loff_t *ppos)
3582{
3583 struct iwl_lq_sta *lq_sta = file->private_data;
f58220f6 3584 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
757cf23b
ES		 3585
3586 return count;
3587}
3588
3589static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3590 .read = rs_sta_dbgfs_drv_tx_stats_read,
3591 .write = rs_sta_dbgfs_drv_tx_stats_write,
3592 .open = simple_open,
3593 .llseek = default_llseek,
3594};
3595
1e9c62fa
ES		 3596static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3597 char __user *user_buf,
3598 size_t count, loff_t *ppos)
3599{
3600 struct iwl_lq_sta *lq_sta = file->private_data;
3601 char buf[12];
3602 int bufsz = sizeof(buf);
3603 int pos = 0;
3604 static const char * const ss_force_name[] = {
3605 [RS_SS_FORCE_NONE] = "none",
3606 [RS_SS_FORCE_STBC] = "stbc",
3607 [RS_SS_FORCE_BFER] = "bfer",
3608 [RS_SS_FORCE_SISO] = "siso",
3609 };
3610
3611 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
878985ce 3612 ss_force_name[lq_sta->pers.ss_force]);
1e9c62fa
ES		 3613 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3614}
3615
3616static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3617 size_t count, loff_t *ppos)
3618{
3619 struct iwl_mvm *mvm = lq_sta->pers.drv;
3620 int ret = 0;
3621
3622 if (!strncmp("none", buf, 4)) {
878985ce 3623 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
1e9c62fa 3624 } else if (!strncmp("siso", buf, 4)) {
878985ce 3625 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
1e9c62fa
ES		 3626 } else if (!strncmp("stbc", buf, 4)) {
3627 if (lq_sta->stbc_capable) {
878985ce 3628 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
1e9c62fa
ES		 3629 } else {
3630 IWL_ERR(mvm,
3631 "can't force STBC. peer doesn't support\n");
3632 ret = -EINVAL;
3633 }
3634 } else if (!strncmp("bfer", buf, 4)) {
3635 if (lq_sta->bfer_capable) {
878985ce 3636 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
1e9c62fa
ES		 3637 } else {
3638 IWL_ERR(mvm,
3639 "can't force BFER. peer doesn't support\n");
3640 ret = -EINVAL;
3641 }
3642 } else {
3643 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3644 ret = -EINVAL;
3645 }
3646 return ret ?: count;
3647}
3648
3649#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3650 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3651#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3652 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3653 &iwl_dbgfs_##name##_ops)) \
3654 goto err; \
3655 } while (0)
3656
3657MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3658
8ca151b5
JB		 3659static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3660{
3661 struct iwl_lq_sta *lq_sta = mvm_sta;
1e9c62fa 3662
c6e1faad
EP		 3663 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3664 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3665 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3666 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3667 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3668 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3669 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3670 &lq_sta->tx_agg_tid_en);
3671 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3672 &lq_sta->pers.dbg_fixed_txp_reduction);
1e9c62fa
ES		 3673
3674 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3675 return;
3676err:
3677 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
8ca151b5
JB		 3678}
3679
3680static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3681{
8ca151b5
JB		 3682}
3683#endif
3684
3685/*
3686 * Initialization of rate scaling information is done by driver after
3687 * the station is added. Since mac80211 calls this function before a
3688 * station is added we ignore it.
3689 */
3690static void rs_rate_init_stub(void *mvm_r,
3de805cf
SW		 3691 struct ieee80211_supported_band *sband,
3692 struct cfg80211_chan_def *chandef,
3693 struct ieee80211_sta *sta, void *mvm_sta)
8ca151b5
JB		 3694{
3695}
631ad703
JB		 3696
3697static const struct rate_control_ops rs_mvm_ops = {
8ca151b5 3698 .name = RS_NAME,
1ebc8f2e 3699 .tx_status = rs_mac80211_tx_status,
8ca151b5
JB		 3700 .get_rate = rs_get_rate,
3701 .rate_init = rs_rate_init_stub,
3702 .alloc = rs_alloc,
3703 .free = rs_free,
3704 .alloc_sta = rs_alloc_sta,
3705 .free_sta = rs_free_sta,
b87c2179 3706 .rate_update = rs_rate_update,
8ca151b5
JB		 3707#ifdef CONFIG_MAC80211_DEBUGFS
3708 .add_sta_debugfs = rs_add_debugfs,
3709 .remove_sta_debugfs = rs_remove_debugfs,
3710#endif
3711};
3712
3713int iwl_mvm_rate_control_register(void)
3714{
3715 return ieee80211_rate_control_register(&rs_mvm_ops);
3716}
3717
3718void iwl_mvm_rate_control_unregister(void)
3719{
3720 ieee80211_rate_control_unregister(&rs_mvm_ops);
3721}
9ee718aa
EL		 3722
3723/**
3724 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3725 * Tx protection, according to this rquest and previous requests,
3726 * and send the LQ command.
9ee718aa
EL		 3727 * @mvmsta: The station
3728 * @enable: Enable Tx protection?
3729 */
e126b5d9
JB		 3730int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3731 bool enable)
9ee718aa 3732{
e126b5d9
JB		 3733 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3734
9ee718aa
EL		 3735 lockdep_assert_held(&mvm->mutex);
3736
3737 if (enable) {
3738 if (mvmsta->tx_protection == 0)
d307ec8d 3739 lq->flags |= LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 3740 mvmsta->tx_protection++;
3741 } else {
3742 mvmsta->tx_protection--;
3743 if (mvmsta->tx_protection == 0)
d307ec8d 3744 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 3745 }
3746
9e680946 3747 return iwl_mvm_send_lq_cmd(mvm, lq, false);
9ee718aa 3748}
Linux 6.x block layer and io_uring tree(s)