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iwlwifi: mvm: use a new API for enabling STBC
[mirror_ubuntu-artful-kernel.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"
42
43#define RS_NAME "iwl-mvm-rs"
44
8ca151b5 45#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
8ca151b5 46
834437da
ES		 47/* Calculations of success ratio are done in fixed point where 12800 is 100%.
48 * Use this macro when dealing with thresholds consts set as a percentage
49 */
50#define RS_PERCENT(x) (128 * x)
8ca151b5
JB		 51
52static u8 rs_ht_to_legacy[] = {
da87d7d5
ES		 53 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
54 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
55 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
56 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
57 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
58 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
59 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
60 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
61 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
8ca151b5
JB		 63};
64
65static const u8 ant_toggle_lookup[] = {
ef4394b9
EP		 66 [ANT_NONE] = ANT_NONE,
67 [ANT_A] = ANT_B,
68 [ANT_B] = ANT_C,
69 [ANT_AB] = ANT_BC,
70 [ANT_C] = ANT_A,
71 [ANT_AC] = ANT_AB,
72 [ANT_BC] = ANT_AC,
73 [ANT_ABC] = ANT_ABC,
8ca151b5
JB		 74};
75
d310e405
ES		 76#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
77 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
78 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
79 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
80 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
82 IWL_RATE_##rp##M_INDEX, \
ab055ce9 83 IWL_RATE_##rn##M_INDEX }
8ca151b5 84
d310e405
ES		 85#define IWL_DECLARE_MCS_RATE(s) \
86 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
87 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
88 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
89 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
91 IWL_RATE_INVM_INDEX, \
92 IWL_RATE_INVM_INDEX }
93
8ca151b5
JB		 94/*
95 * Parameter order:
ab055ce9 96 * rate, ht rate, prev rate, next rate
8ca151b5
JB		 97 *
98 * If there isn't a valid next or previous rate then INV is used which
99 * maps to IWL_RATE_INVALID
100 *
101 */
102static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
ab055ce9
ES		 103 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
104 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
105 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
106 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
d310e405
ES		 107 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
108 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
109 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
110 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
111 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
112 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
113 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
114 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
115 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
116 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
117 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
8ca151b5
JB		 118};
119
4e4b815c
ES		 120enum rs_action {
121 RS_ACTION_STAY = 0,
122 RS_ACTION_DOWNSCALE = -1,
123 RS_ACTION_UPSCALE = 1,
124};
125
b3b06a32
ES		 126enum rs_column_mode {
127 RS_INVALID = 0,
128 RS_LEGACY,
129 RS_SISO,
130 RS_MIMO2,
131};
132
fd7dbee5 133#define MAX_NEXT_COLUMNS 7
b3b06a32
ES		 134#define MAX_COLUMN_CHECKS 3
135
136typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
137 struct ieee80211_sta *sta,
138 struct iwl_scale_tbl_info *tbl);
139
140struct rs_tx_column {
141 enum rs_column_mode mode;
142 u8 ant;
143 bool sgi;
144 enum rs_column next_columns[MAX_NEXT_COLUMNS];
145 allow_column_func_t checks[MAX_COLUMN_CHECKS];
146};
147
219fb66b
EG		 148static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
149 struct iwl_scale_tbl_info *tbl)
150{
151 return iwl_mvm_bt_coex_is_ant_avail(mvm, tbl->rate.ant);
152}
153
b3b06a32
ES		 154static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
155 struct iwl_scale_tbl_info *tbl)
156{
157 if (!sta->ht_cap.ht_supported)
158 return false;
159
160 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
161 return false;
162
a0544272 163 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
b3b06a32
ES		 164 return false;
165
166 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
167 return false;
168
169 return true;
170}
171
172static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
173 struct iwl_scale_tbl_info *tbl)
174{
175 if (!sta->ht_cap.ht_supported)
176 return false;
177
178 return true;
179}
180
181static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
182 struct iwl_scale_tbl_info *tbl)
183{
184 struct rs_rate *rate = &tbl->rate;
185 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
186 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
187
188 if (is_ht20(rate) && (ht_cap->cap &
189 IEEE80211_HT_CAP_SGI_20))
190 return true;
191 if (is_ht40(rate) && (ht_cap->cap &
192 IEEE80211_HT_CAP_SGI_40))
193 return true;
194 if (is_ht80(rate) && (vht_cap->cap &
195 IEEE80211_VHT_CAP_SHORT_GI_80))
196 return true;
197
198 return false;
199}
200
201static const struct rs_tx_column rs_tx_columns[] = {
202 [RS_COLUMN_LEGACY_ANT_A] = {
203 .mode = RS_LEGACY,
204 .ant = ANT_A,
205 .next_columns = {
206 RS_COLUMN_LEGACY_ANT_B,
207 RS_COLUMN_SISO_ANT_A,
31b20452 208 RS_COLUMN_MIMO2,
d8fff919
ES		 209 RS_COLUMN_INVALID,
210 RS_COLUMN_INVALID,
fd7dbee5
ES		 211 RS_COLUMN_INVALID,
212 RS_COLUMN_INVALID,
b3b06a32 213 },
219fb66b
EG		 214 .checks = {
215 rs_ant_allow,
216 },
b3b06a32
ES		 217 },
218 [RS_COLUMN_LEGACY_ANT_B] = {
219 .mode = RS_LEGACY,
220 .ant = ANT_B,
221 .next_columns = {
222 RS_COLUMN_LEGACY_ANT_A,
223 RS_COLUMN_SISO_ANT_B,
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_SISO_ANT_A] = {
235 .mode = RS_SISO,
236 .ant = ANT_A,
237 .next_columns = {
238 RS_COLUMN_SISO_ANT_B,
239 RS_COLUMN_MIMO2,
240 RS_COLUMN_SISO_ANT_A_SGI,
fd7dbee5
ES		 241 RS_COLUMN_LEGACY_ANT_A,
242 RS_COLUMN_LEGACY_ANT_B,
d8fff919 243 RS_COLUMN_INVALID,
31b20452 244 RS_COLUMN_INVALID,
b3b06a32
ES		 245 },
246 .checks = {
247 rs_siso_allow,
219fb66b 248 rs_ant_allow,
b3b06a32
ES		 249 },
250 },
251 [RS_COLUMN_SISO_ANT_B] = {
252 .mode = RS_SISO,
253 .ant = ANT_B,
254 .next_columns = {
255 RS_COLUMN_SISO_ANT_A,
256 RS_COLUMN_MIMO2,
257 RS_COLUMN_SISO_ANT_B_SGI,
fd7dbee5
ES		 258 RS_COLUMN_LEGACY_ANT_A,
259 RS_COLUMN_LEGACY_ANT_B,
d8fff919 260 RS_COLUMN_INVALID,
31b20452 261 RS_COLUMN_INVALID,
b3b06a32
ES		 262 },
263 .checks = {
264 rs_siso_allow,
219fb66b 265 rs_ant_allow,
b3b06a32
ES		 266 },
267 },
268 [RS_COLUMN_SISO_ANT_A_SGI] = {
269 .mode = RS_SISO,
270 .ant = ANT_A,
271 .sgi = true,
272 .next_columns = {
273 RS_COLUMN_SISO_ANT_B_SGI,
274 RS_COLUMN_MIMO2_SGI,
275 RS_COLUMN_SISO_ANT_A,
fd7dbee5
ES		 276 RS_COLUMN_LEGACY_ANT_A,
277 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 278 RS_COLUMN_INVALID,
279 RS_COLUMN_INVALID,
b3b06a32
ES		 280 },
281 .checks = {
282 rs_siso_allow,
219fb66b 283 rs_ant_allow,
b3b06a32
ES		 284 rs_sgi_allow,
285 },
286 },
287 [RS_COLUMN_SISO_ANT_B_SGI] = {
288 .mode = RS_SISO,
289 .ant = ANT_B,
290 .sgi = true,
291 .next_columns = {
292 RS_COLUMN_SISO_ANT_A_SGI,
293 RS_COLUMN_MIMO2_SGI,
294 RS_COLUMN_SISO_ANT_B,
fd7dbee5
ES		 295 RS_COLUMN_LEGACY_ANT_A,
296 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 297 RS_COLUMN_INVALID,
298 RS_COLUMN_INVALID,
b3b06a32
ES		 299 },
300 .checks = {
301 rs_siso_allow,
219fb66b 302 rs_ant_allow,
b3b06a32
ES		 303 rs_sgi_allow,
304 },
305 },
306 [RS_COLUMN_MIMO2] = {
307 .mode = RS_MIMO2,
308 .ant = ANT_AB,
309 .next_columns = {
310 RS_COLUMN_SISO_ANT_A,
311 RS_COLUMN_MIMO2_SGI,
fd7dbee5
ES		 312 RS_COLUMN_LEGACY_ANT_A,
313 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 314 RS_COLUMN_INVALID,
315 RS_COLUMN_INVALID,
316 RS_COLUMN_INVALID,
b3b06a32
ES		 317 },
318 .checks = {
319 rs_mimo_allow,
320 },
321 },
322 [RS_COLUMN_MIMO2_SGI] = {
323 .mode = RS_MIMO2,
324 .ant = ANT_AB,
325 .sgi = true,
326 .next_columns = {
327 RS_COLUMN_SISO_ANT_A_SGI,
328 RS_COLUMN_MIMO2,
fd7dbee5
ES		 329 RS_COLUMN_LEGACY_ANT_A,
330 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 331 RS_COLUMN_INVALID,
332 RS_COLUMN_INVALID,
333 RS_COLUMN_INVALID,
b3b06a32
ES		 334 },
335 .checks = {
336 rs_mimo_allow,
337 rs_sgi_allow,
338 },
339 },
340};
341
8ca151b5
JB		 342static inline u8 rs_extract_rate(u32 rate_n_flags)
343{
344 /* also works for HT because bits 7:6 are zero there */
345 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
346}
347
348static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
349{
350 int idx = 0;
351
8ca151b5 352 if (rate_n_flags & RATE_MCS_HT_MSK) {
d310e405
ES		 353 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
354 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 355
d310e405 356 /* skip 9M not supported in HT*/
8ca151b5
JB		 357 if (idx >= IWL_RATE_9M_INDEX)
358 idx += 1;
4e82dd3a 359 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
8ca151b5 360 return idx;
d310e405
ES		 361 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
362 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
363 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 364
d310e405
ES		 365 /* skip 9M not supported in VHT*/
366 if (idx >= IWL_RATE_9M_INDEX)
367 idx++;
368 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
369 return idx;
8ca151b5 370 } else {
d310e405
ES		 371 /* legacy rate format, search for match in table */
372
373 u8 legacy_rate = rs_extract_rate(rate_n_flags);
8ca151b5 374 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
d310e405 375 if (iwl_rates[idx].plcp == legacy_rate)
8ca151b5
JB		 376 return idx;
377 }
378
560843f4 379 return IWL_RATE_INVALID;
8ca151b5
JB		 380}
381
382static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1ebc8f2e
ES		 383 struct ieee80211_sta *sta,
384 struct iwl_lq_sta *lq_sta,
385 int tid);
8fc7c58c
ES		 386static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
387 struct ieee80211_sta *sta,
388 struct iwl_lq_sta *lq_sta,
389 const struct rs_rate *initial_rate);
8ca151b5 390static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
8ca151b5 391
8ca151b5
JB		 392/**
393 * The following tables contain the expected throughput metrics for all rates
394 *
395 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
396 *
397 * where invalid entries are zeros.
398 *
399 * CCK rates are only valid in legacy table and will only be used in G
400 * (2.4 GHz) band.
401 */
402
a34529e8 403static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
4e82dd3a 404 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
8ca151b5
JB		 405};
406
4e82dd3a
ES		 407/* Expected TpT tables. 4 indexes:
408 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
409 */
a34529e8 410static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 411 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
412 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
413 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
414 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
8ca151b5
JB		 415};
416
a34529e8 417static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 418 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
419 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
420 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
421 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
8ca151b5
JB		 422};
423
a34529e8 424static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 425 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
426 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
427 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
428 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
429};
430
a34529e8 431static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 432 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
433 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
434 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
435 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
8ca151b5
JB		 436};
437
a34529e8 438static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 439 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
440 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
441 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
442 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
8ca151b5
JB		 443};
444
a34529e8 445static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 446 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
447 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
448 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
449 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
450};
451
8ca151b5
JB		 452/* mbps, mcs */
453static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
454 { "1", "BPSK DSSS"},
455 { "2", "QPSK DSSS"},
456 {"5.5", "BPSK CCK"},
457 { "11", "QPSK CCK"},
458 { "6", "BPSK 1/2"},
459 { "9", "BPSK 1/2"},
460 { "12", "QPSK 1/2"},
461 { "18", "QPSK 3/4"},
462 { "24", "16QAM 1/2"},
463 { "36", "16QAM 3/4"},
464 { "48", "64QAM 2/3"},
465 { "54", "64QAM 3/4"},
466 { "60", "64QAM 5/6"},
467};
468
469#define MCS_INDEX_PER_STREAM (8)
470
9d10849e
EG		 471static const char *rs_pretty_ant(u8 ant)
472{
473 static const char * const ant_name[] = {
474 [ANT_NONE] = "None",
475 [ANT_A] = "A",
476 [ANT_B] = "B",
477 [ANT_AB] = "AB",
478 [ANT_C] = "C",
479 [ANT_AC] = "AC",
480 [ANT_BC] = "BC",
481 [ANT_ABC] = "ABC",
482 };
483
484 if (ant > ANT_ABC)
485 return "UNKNOWN";
486
487 return ant_name[ant];
488}
489
490static const char *rs_pretty_lq_type(enum iwl_table_type type)
491{
492 static const char * const lq_types[] = {
493 [LQ_NONE] = "NONE",
494 [LQ_LEGACY_A] = "LEGACY_A",
495 [LQ_LEGACY_G] = "LEGACY_G",
496 [LQ_HT_SISO] = "HT SISO",
497 [LQ_HT_MIMO2] = "HT MIMO",
498 [LQ_VHT_SISO] = "VHT SISO",
499 [LQ_VHT_MIMO2] = "VHT MIMO",
500 };
501
502 if (type < LQ_NONE || type >= LQ_MAX)
503 return "UNKNOWN";
504
505 return lq_types[type];
506}
507
5aa33553
ES		 508static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
509 const char *prefix)
510{
d8bafeaf 511 IWL_DEBUG_RATE(mvm,
26a2cc01 512 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
5aa33553
ES		 513 prefix, rs_pretty_lq_type(rate->type),
514 rate->index, rs_pretty_ant(rate->ant),
d8bafeaf 515 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
5aa33553
ES		 516}
517
8ca151b5
JB		 518static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
519{
520 window->data = 0;
521 window->success_counter = 0;
522 window->success_ratio = IWL_INVALID_VALUE;
523 window->counter = 0;
524 window->average_tpt = IWL_INVALID_VALUE;
8ca151b5
JB		 525}
526
b804eeb6
ES		 527static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
528 struct iwl_scale_tbl_info *tbl)
3ca71f60
EP		 529{
530 int i;
531
b804eeb6 532 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
3ca71f60
EP		 533 for (i = 0; i < IWL_RATE_COUNT; i++)
534 rs_rate_scale_clear_window(&tbl->win[i]);
2fd647f8
EP		 535
536 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
537 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
3ca71f60
EP		 538}
539
8ca151b5
JB		 540static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
541{
542 return (ant_type & valid_antenna) == ant_type;
543}
544
8ca151b5
JB		 545static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
546 struct iwl_lq_sta *lq_data, u8 tid,
547 struct ieee80211_sta *sta)
548{
549 int ret = -EAGAIN;
8ca151b5 550
44cc429c
EG		 551 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
552 sta->addr, tid);
553 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
554 if (ret == -EAGAIN) {
555 /*
556 * driver and mac80211 is out of sync
557 * this might be cause by reloading firmware
558 * stop the tx ba session here
559 */
560 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
561 tid);
562 ieee80211_stop_tx_ba_session(sta, tid);
8ca151b5
JB		 563 }
564 return ret;
565}
566
567static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
568 struct iwl_lq_sta *lq_data,
569 struct ieee80211_sta *sta)
570{
571 if (tid < IWL_MAX_TID_COUNT)
572 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
573 else
574 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
575 tid, IWL_MAX_TID_COUNT);
576}
577
578static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
579{
580 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
581 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
582 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
583}
584
585/*
586 * Static function to get the expected throughput from an iwl_scale_tbl_info
587 * that wraps a NULL pointer check
588 */
589static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
590{
591 if (tbl->expected_tpt)
592 return tbl->expected_tpt[rs_index];
593 return 0;
594}
595
596/**
597 * rs_collect_tx_data - Update the success/failure sliding window
598 *
599 * We keep a sliding window of the last 62 packets transmitted
600 * at this rate. window->data contains the bitmask of successful
601 * packets.
602 */
834437da
ES		 603static int _rs_collect_tx_data(struct iwl_mvm *mvm,
604 struct iwl_scale_tbl_info *tbl,
0bd3c5a7
EP		 605 int scale_index, int attempts, int successes,
606 struct iwl_rate_scale_data *window)
8ca151b5 607{
8ca151b5
JB		 608 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
609 s32 fail_count, tpt;
610
8ca151b5
JB		 611 /* Get expected throughput */
612 tpt = get_expected_tpt(tbl, scale_index);
613
614 /*
615 * Keep track of only the latest 62 tx frame attempts in this rate's
616 * history window; anything older isn't really relevant any more.
617 * If we have filled up the sliding window, drop the oldest attempt;
618 * if the oldest attempt (highest bit in bitmap) shows "success",
619 * subtract "1" from the success counter (this is the main reason
620 * we keep these bitmaps!).
621 */
622 while (attempts > 0) {
623 if (window->counter >= IWL_RATE_MAX_WINDOW) {
624 /* remove earliest */
625 window->counter = IWL_RATE_MAX_WINDOW - 1;
626
627 if (window->data & mask) {
628 window->data &= ~mask;
629 window->success_counter--;
630 }
631 }
632
633 /* Increment frames-attempted counter */
634 window->counter++;
635
636 /* Shift bitmap by one frame to throw away oldest history */
637 window->data <<= 1;
638
639 /* Mark the most recent #successes attempts as successful */
640 if (successes > 0) {
641 window->success_counter++;
642 window->data |= 0x1;
643 successes--;
644 }
645
646 attempts--;
647 }
648
649 /* Calculate current success ratio, avoid divide-by-0! */
650 if (window->counter > 0)
651 window->success_ratio = 128 * (100 * window->success_counter)
652 / window->counter;
653 else
654 window->success_ratio = IWL_INVALID_VALUE;
655
656 fail_count = window->counter - window->success_counter;
657
658 /* Calculate average throughput, if we have enough history. */
834437da
ES		 659 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
660 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
8ca151b5
JB		 661 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
662 else
663 window->average_tpt = IWL_INVALID_VALUE;
664
8ca151b5
JB		 665 return 0;
666}
667
834437da
ES		 668static int rs_collect_tx_data(struct iwl_mvm *mvm,
669 struct iwl_lq_sta *lq_sta,
757cf23b 670 struct iwl_scale_tbl_info *tbl,
2fd647f8
EP		 671 int scale_index, int attempts, int successes,
672 u8 reduced_txp)
0bd3c5a7
EP		 673{
674 struct iwl_rate_scale_data *window = NULL;
2fd647f8 675 int ret;
0bd3c5a7
EP		 676
677 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
678 return -EINVAL;
679
757cf23b 680 if (tbl->column != RS_COLUMN_INVALID) {
f58220f6
ES		 681 struct lq_sta_pers *pers = &lq_sta->pers;
682
683 pers->tx_stats[tbl->column][scale_index].total += attempts;
684 pers->tx_stats[tbl->column][scale_index].success += successes;
757cf23b
ES		 685 }
686
0bd3c5a7
EP		 687 /* Select window for current tx bit rate */
688 window = &(tbl->win[scale_index]);
689
834437da 690 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
2fd647f8
EP		 691 window);
692 if (ret)
693 return ret;
694
695 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
696 return -EINVAL;
697
698 window = &tbl->tpc_win[reduced_txp];
834437da 699 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
0bd3c5a7
EP		 700 window);
701}
702
5aa33553
ES		 703/* Convert rs_rate object into ucode rate bitmask */
704static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
8fc7c58c 705 struct rs_rate *rate)
8ca151b5 706{
5aa33553
ES		 707 u32 ucode_rate = 0;
708 int index = rate->index;
8ca151b5 709
5aa33553 710 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
d310e405
ES		 711 RATE_MCS_ANT_ABC_MSK);
712
5aa33553
ES		 713 if (is_legacy(rate)) {
714 ucode_rate |= iwl_rates[index].plcp;
8ca151b5 715 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
5aa33553
ES		 716 ucode_rate |= RATE_MCS_CCK_MSK;
717 return ucode_rate;
d310e405
ES		 718 }
719
5aa33553 720 if (is_ht(rate)) {
d310e405 721 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
8ca151b5 722 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
4e82dd3a 723 index = IWL_LAST_HT_RATE;
8ca151b5 724 }
5aa33553 725 ucode_rate |= RATE_MCS_HT_MSK;
8ca151b5 726
5aa33553
ES		 727 if (is_ht_siso(rate))
728 ucode_rate |= iwl_rates[index].plcp_ht_siso;
729 else if (is_ht_mimo2(rate))
730 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
8ca151b5 731 else
d972ab31 732 WARN_ON_ONCE(1);
5aa33553 733 } else if (is_vht(rate)) {
d310e405
ES		 734 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
735 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
736 index = IWL_LAST_VHT_RATE;
737 }
5aa33553
ES		 738 ucode_rate |= RATE_MCS_VHT_MSK;
739 if (is_vht_siso(rate))
740 ucode_rate |= iwl_rates[index].plcp_vht_siso;
741 else if (is_vht_mimo2(rate))
742 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
d310e405
ES		 743 else
744 WARN_ON_ONCE(1);
745
8ca151b5 746 } else {
5aa33553 747 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
8ca151b5
JB		 748 }
749
d8bafeaf
ES		 750 if (is_siso(rate) && rate->stbc) {
751 /* To enable STBC we need to set both a flag and ANT_AB */
752 ucode_rate |= RATE_MCS_ANT_AB_MSK;
753 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
754 }
755
5aa33553
ES		 756 ucode_rate |= rate->bw;
757 if (rate->sgi)
758 ucode_rate |= RATE_MCS_SGI_MSK;
a3576ff2
ES		 759 if (rate->ldpc)
760 ucode_rate |= RATE_MCS_LDPC_MSK;
d310e405 761
5aa33553 762 return ucode_rate;
8ca151b5
JB		 763}
764
5aa33553
ES		 765/* Convert a ucode rate into an rs_rate object */
766static int rs_rate_from_ucode_rate(const u32 ucode_rate,
767 enum ieee80211_band band,
768 struct rs_rate *rate)
8ca151b5 769{
5aa33553
ES		 770 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
771 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
d310e405 772 u8 nss;
8ca151b5 773
9e898f1b 774 memset(rate, 0, sizeof(*rate));
5aa33553 775 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
8ca151b5 776
560843f4 777 if (rate->index == IWL_RATE_INVALID)
8ca151b5 778 return -EINVAL;
5aa33553
ES		 779
780 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
8ca151b5 781
d310e405 782 /* Legacy */
5aa33553
ES		 783 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
784 !(ucode_rate & RATE_MCS_VHT_MSK)) {
8ca151b5
JB		 785 if (num_of_ant == 1) {
786 if (band == IEEE80211_BAND_5GHZ)
5aa33553 787 rate->type = LQ_LEGACY_A;
8ca151b5 788 else
5aa33553 789 rate->type = LQ_LEGACY_G;
8ca151b5 790 }
d310e405
ES		 791
792 return 0;
793 }
794
795 /* HT or VHT */
5aa33553
ES		 796 if (ucode_rate & RATE_MCS_SGI_MSK)
797 rate->sgi = true;
a3576ff2
ES		 798 if (ucode_rate & RATE_MCS_LDPC_MSK)
799 rate->ldpc = true;
d8bafeaf
ES		 800 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
801 rate->stbc = true;
d310e405 802
5aa33553 803 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
d310e405 804
5aa33553
ES		 805 if (ucode_rate & RATE_MCS_HT_MSK) {
806 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
d310e405
ES		 807 RATE_HT_MCS_NSS_POS) + 1;
808
809 if (nss == 1) {
5aa33553 810 rate->type = LQ_HT_SISO;
d8bafeaf 811 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
d310e405 812 } else if (nss == 2) {
5aa33553 813 rate->type = LQ_HT_MIMO2;
d310e405 814 WARN_ON_ONCE(num_of_ant != 2);
8ca151b5 815 } else {
d310e405
ES		 816 WARN_ON_ONCE(1);
817 }
5aa33553
ES		 818 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
819 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
d310e405
ES		 820 RATE_VHT_MCS_NSS_POS) + 1;
821
822 if (nss == 1) {
5aa33553 823 rate->type = LQ_VHT_SISO;
1507fb75 824 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
d310e405 825 } else if (nss == 2) {
5aa33553 826 rate->type = LQ_VHT_MIMO2;
d310e405
ES		 827 WARN_ON_ONCE(num_of_ant != 2);
828 } else {
829 WARN_ON_ONCE(1);
8ca151b5
JB		 830 }
831 }
d310e405 832
5aa33553
ES		 833 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
834 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
835 !is_vht(rate));
d310e405 836
8ca151b5
JB		 837 return 0;
838}
839
840/* switch to another antenna/antennas and return 1 */
841/* if no other valid antenna found, return 0 */
8fc7c58c 842static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
8ca151b5
JB		 843{
844 u8 new_ant_type;
845
5aa33553 846 if (!rate->ant || rate->ant > ANT_ABC)
8ca151b5
JB		 847 return 0;
848
5aa33553 849 if (!rs_is_valid_ant(valid_ant, rate->ant))
8ca151b5
JB		 850 return 0;
851
5aa33553 852 new_ant_type = ant_toggle_lookup[rate->ant];
8ca151b5 853
5aa33553 854 while ((new_ant_type != rate->ant) &&
8ca151b5
JB		 855 !rs_is_valid_ant(valid_ant, new_ant_type))
856 new_ant_type = ant_toggle_lookup[new_ant_type];
857
5aa33553 858 if (new_ant_type == rate->ant)
8ca151b5
JB		 859 return 0;
860
5aa33553
ES		 861 rate->ant = new_ant_type;
862
8ca151b5
JB		 863 return 1;
864}
865
8ca151b5 866static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
5aa33553 867 struct rs_rate *rate)
8ca151b5 868{
5aa33553 869 if (is_legacy(rate))
8ca151b5 870 return lq_sta->active_legacy_rate;
5aa33553 871 else if (is_siso(rate))
d310e405 872 return lq_sta->active_siso_rate;
5aa33553 873 else if (is_mimo2(rate))
d310e405
ES		 874 return lq_sta->active_mimo2_rate;
875
876 WARN_ON_ONCE(1);
877 return 0;
8ca151b5
JB		 878}
879
880static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
881 int rate_type)
882{
883 u8 high = IWL_RATE_INVALID;
884 u8 low = IWL_RATE_INVALID;
885
886 /* 802.11A or ht walks to the next literal adjacent rate in
887 * the rate table */
5aa33553 888 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
8ca151b5
JB		 889 int i;
890 u32 mask;
891
892 /* Find the previous rate that is in the rate mask */
893 i = index - 1;
894 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
895 if (rate_mask & mask) {
896 low = i;
897 break;
898 }
899 }
900
901 /* Find the next rate that is in the rate mask */
902 i = index + 1;
903 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
904 if (rate_mask & mask) {
905 high = i;
906 break;
907 }
908 }
909
910 return (high << 8) | low;
911 }
912
913 low = index;
914 while (low != IWL_RATE_INVALID) {
915 low = iwl_rates[low].prev_rs;
916 if (low == IWL_RATE_INVALID)
917 break;
918 if (rate_mask & (1 << low))
919 break;
8ca151b5
JB		 920 }
921
922 high = index;
923 while (high != IWL_RATE_INVALID) {
924 high = iwl_rates[high].next_rs;
925 if (high == IWL_RATE_INVALID)
926 break;
927 if (rate_mask & (1 << high))
928 break;
8ca151b5
JB		 929 }
930
931 return (high << 8) | low;
932}
933
e07be6d3
ES		 934static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
935 struct rs_rate *rate)
8ca151b5 936{
e07be6d3
ES		 937 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
938}
939
940/* Get the next supported lower rate in the current column.
941 * Return true if bottom rate in the current column was reached
942 */
943static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
944 struct rs_rate *rate)
945{
946 u8 low;
8ca151b5 947 u16 high_low;
e07be6d3 948 u16 rate_mask;
ae969afe 949 struct iwl_mvm *mvm = lq_sta->pers.drv;
e07be6d3
ES		 950
951 rate_mask = rs_get_supported_rates(lq_sta, rate);
952 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
953 rate->type);
954 low = high_low & 0xff;
955
956 /* Bottom rate of column reached */
957 if (low == IWL_RATE_INVALID)
958 return true;
959
960 rate->index = low;
961 return false;
962}
963
964/* Get the next rate to use following a column downgrade */
965static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
966 struct rs_rate *rate)
967{
ae969afe 968 struct iwl_mvm *mvm = lq_sta->pers.drv;
8ca151b5 969
e07be6d3
ES		 970 if (is_legacy(rate)) {
971 /* No column to downgrade from Legacy */
972 return;
973 } else if (is_siso(rate)) {
974 /* Downgrade to Legacy if we were in SISO */
8ca151b5 975 if (lq_sta->band == IEEE80211_BAND_5GHZ)
5aa33553 976 rate->type = LQ_LEGACY_A;
8ca151b5 977 else
5aa33553 978 rate->type = LQ_LEGACY_G;
8ca151b5 979
a56db7d1 980 rate->bw = RATE_MCS_CHAN_WIDTH_20;
8ca151b5 981
b800040d 982 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
e07be6d3 983 rate->index > IWL_RATE_MCS_9_INDEX);
8ca151b5 984
e07be6d3 985 rate->index = rs_ht_to_legacy[rate->index];
a3576ff2 986 rate->ldpc = false;
e07be6d3
ES		 987 } else {
988 /* Downgrade to SISO with same MCS if in MIMO */
989 rate->type = is_vht_mimo2(rate) ?
990 LQ_VHT_SISO : LQ_HT_SISO;
8ca151b5
JB		 991 }
992
e07be6d3 993 if (num_of_ant(rate->ant) > 1)
a0544272 994 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
8ca151b5 995
e07be6d3
ES		 996 /* Relevant in both switching to SISO or Legacy */
997 rate->sgi = false;
998
999 if (!rs_rate_supported(lq_sta, rate))
1000 rs_get_lower_rate_in_column(lq_sta, rate);
8ca151b5
JB		 1001}
1002
5aa33553
ES		 1003/* Simple function to compare two rate scale table types */
1004static inline bool rs_rate_match(struct rs_rate *a,
1005 struct rs_rate *b)
8ca151b5 1006{
d8bafeaf
ES		 1007 bool ant_match;
1008
1009 if (a->stbc)
1010 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1011 else
1012 ant_match = (a->ant == b->ant);
1013
1014 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1015 && ant_match;
8ca151b5
JB		 1016}
1017
d310e405
ES		 1018static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1019{
1020 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1021 return RATE_MCS_CHAN_WIDTH_40;
1022 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1023 return RATE_MCS_CHAN_WIDTH_80;
1024 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1025 return RATE_MCS_CHAN_WIDTH_160;
1026
1027 return RATE_MCS_CHAN_WIDTH_20;
1028}
1029
1ebc8f2e
ES		 1030static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1031{
1032 u8 tid = IWL_MAX_TID_COUNT;
1033
1034 if (ieee80211_is_data_qos(hdr->frame_control)) {
1035 u8 *qc = ieee80211_get_qos_ctl(hdr);
1036 tid = qc[0] & 0xf;
1037 }
1038
1039 if (unlikely(tid > IWL_MAX_TID_COUNT))
1040 tid = IWL_MAX_TID_COUNT;
1041
1042 return tid;
1043}
1044
1045void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1046 int tid, struct ieee80211_tx_info *info)
8ca151b5
JB		 1047{
1048 int legacy_success;
1049 int retries;
5aa33553 1050 int mac_index, i;
8ca151b5 1051 struct iwl_lq_cmd *table;
8ca151b5 1052 enum mac80211_rate_control_flags mac_flags;
5aa33553
ES		 1053 u32 ucode_rate;
1054 struct rs_rate rate;
8ca151b5 1055 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
2fd647f8 1056 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1ebc8f2e
ES		 1057 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1058 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
8ca151b5 1059
8ca151b5
JB		 1060 /* Treat uninitialized rate scaling data same as non-existing. */
1061 if (!lq_sta) {
1062 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1063 return;
ae969afe 1064 } else if (!lq_sta->pers.drv) {
8ca151b5
JB		 1065 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1066 return;
1067 }
1068
8e96440e 1069#ifdef CONFIG_MAC80211_DEBUGFS
87d5e415 1070 /* Disable last tx check if we are debugging with fixed rate */
ae969afe 1071 if (lq_sta->pers.dbg_fixed_rate) {
87d5e415
ES		 1072 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1073 return;
1074 }
1075#endif
8ca151b5
JB		 1076 /* This packet was aggregated but doesn't carry status info */
1077 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1078 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1079 return;
1080
1081 /*
1082 * Ignore this Tx frame response if its initial rate doesn't match
1083 * that of latest Link Quality command. There may be stragglers
1084 * from a previous Link Quality command, but we're no longer interested
1085 * in those; they're either from the "active" mode while we're trying
1086 * to check "search" mode, or a prior "search" mode after we've moved
1087 * to a new "search" mode (which might become the new "active" mode).
1088 */
1089 table = &lq_sta->lq;
5aa33553
ES		 1090 ucode_rate = le32_to_cpu(table->rs_table[0]);
1091 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5 1092 if (info->band == IEEE80211_BAND_5GHZ)
5aa33553 1093 rate.index -= IWL_FIRST_OFDM_RATE;
8ca151b5
JB		 1094 mac_flags = info->status.rates[0].flags;
1095 mac_index = info->status.rates[0].idx;
1096 /* For HT packets, map MCS to PLCP */
1097 if (mac_flags & IEEE80211_TX_RC_MCS) {
1098 /* Remove # of streams */
1099 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1100 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1101 mac_index++;
1102 /*
1103 * mac80211 HT index is always zero-indexed; we need to move
1104 * HT OFDM rates after CCK rates in 2.4 GHz band
1105 */
1106 if (info->band == IEEE80211_BAND_2GHZ)
1107 mac_index += IWL_FIRST_OFDM_RATE;
d310e405
ES		 1108 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1109 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1110 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1111 mac_index++;
8ca151b5 1112 }
d310e405 1113
87d5e415 1114 if (time_after(jiffies,
834437da
ES		 1115 (unsigned long)(lq_sta->last_tx +
1116 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
efad21d2
JB		 1117 int t;
1118
87d5e415 1119 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
efad21d2
JB		 1120 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1121 ieee80211_stop_tx_ba_session(sta, t);
87d5e415 1122
1ebc8f2e 1123 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
87d5e415
ES		 1124 return;
1125 }
1126 lq_sta->last_tx = jiffies;
1127
8ca151b5
JB		 1128 /* Here we actually compare this rate to the latest LQ command */
1129 if ((mac_index < 0) ||
5aa33553
ES		 1130 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1131 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1132 (rate.ant != info->status.antenna) ||
1133 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
d310e405 1134 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
5aa33553 1135 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
d310e405 1136 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
5aa33553 1137 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
d310e405 1138 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
5aa33553 1139 (rate.index != mac_index)) {
8ca151b5
JB		 1140 IWL_DEBUG_RATE(mvm,
1141 "initial rate %d does not match %d (0x%x)\n",
5aa33553 1142 mac_index, rate.index, ucode_rate);
8ca151b5
JB		 1143 /*
1144 * Since rates mis-match, the last LQ command may have failed.
1145 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1146 * ... driver.
1147 */
1148 lq_sta->missed_rate_counter++;
834437da 1149 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
8ca151b5 1150 lq_sta->missed_rate_counter = 0;
b3b06a32
ES		 1151 IWL_DEBUG_RATE(mvm,
1152 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1153 lq_sta->rs_state);
9e680946 1154 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1155 }
1156 /* Regardless, ignore this status info for outdated rate */
1157 return;
1158 } else
1159 /* Rate did match, so reset the missed_rate_counter */
1160 lq_sta->missed_rate_counter = 0;
1161
26a2cc01 1162 if (!lq_sta->search_better_tbl) {
8ca151b5
JB		 1163 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1164 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
26a2cc01 1165 } else {
8ca151b5
JB		 1166 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1167 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
26a2cc01
ES		 1168 }
1169
1170 if (WARN_ON_ONCE(!rs_rate_match(&rate, &curr_tbl->rate))) {
8ca151b5
JB		 1171 IWL_DEBUG_RATE(mvm,
1172 "Neither active nor search matches tx rate\n");
1173 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 1174 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
8ca151b5 1175 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553
ES		 1176 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1177 rs_dump_rate(mvm, &rate, "ACTUAL");
1178
8ca151b5
JB		 1179 /*
1180 * no matching table found, let's by-pass the data collection
1181 * and continue to perform rate scale to find the rate table
1182 */
1183 rs_stay_in_table(lq_sta, true);
1184 goto done;
1185 }
1186
1187 /*
1188 * Updating the frame history depends on whether packets were
1189 * aggregated.
1190 *
1191 * For aggregation, all packets were transmitted at the same rate, the
1192 * first index into rate scale table.
1193 */
1194 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
d6bda667
ES		 1195 /* ampdu_ack_len = 0 marks no BA was received. In this case
1196 * treat it as a single frame loss as we don't want the success
1197 * ratio to dip too quickly because a BA wasn't received
1198 */
1199 if (info->status.ampdu_ack_len == 0)
1200 info->status.ampdu_len = 1;
1201
5aa33553
ES		 1202 ucode_rate = le32_to_cpu(table->rs_table[0]);
1203 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
834437da 1204 rs_collect_tx_data(mvm, lq_sta, curr_tbl, rate.index,
8ca151b5 1205 info->status.ampdu_len,
2fd647f8
EP		 1206 info->status.ampdu_ack_len,
1207 reduced_txp);
8ca151b5
JB		 1208
1209 /* Update success/fail counts if not searching for new mode */
b3b06a32 1210 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1211 lq_sta->total_success += info->status.ampdu_ack_len;
1212 lq_sta->total_failed += (info->status.ampdu_len -
1213 info->status.ampdu_ack_len);
1214 }
1215 } else {
1216 /*
1217 * For legacy, update frame history with for each Tx retry.
1218 */
1219 retries = info->status.rates[0].count - 1;
1220 /* HW doesn't send more than 15 retries */
1221 retries = min(retries, 15);
1222
1223 /* The last transmission may have been successful */
1224 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1225 /* Collect data for each rate used during failed TX attempts */
1226 for (i = 0; i <= retries; ++i) {
5aa33553
ES		 1227 ucode_rate = le32_to_cpu(table->rs_table[i]);
1228 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5
JB		 1229 /*
1230 * Only collect stats if retried rate is in the same RS
1231 * table as active/search.
1232 */
5aa33553 1233 if (rs_rate_match(&rate, &curr_tbl->rate))
8ca151b5 1234 tmp_tbl = curr_tbl;
5aa33553 1235 else if (rs_rate_match(&rate, &other_tbl->rate))
8ca151b5 1236 tmp_tbl = other_tbl;
4107dbd2 1237 else
8ca151b5 1238 continue;
4107dbd2 1239
834437da 1240 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, rate.index, 1,
2fd647f8
EP		 1241 i < retries ? 0 : legacy_success,
1242 reduced_txp);
8ca151b5
JB		 1243 }
1244
1245 /* Update success/fail counts if not searching for new mode */
b3b06a32 1246 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1247 lq_sta->total_success += legacy_success;
1248 lq_sta->total_failed += retries + (1 - legacy_success);
1249 }
1250 }
1251 /* The last TX rate is cached in lq_sta; it's set in if/else above */
5aa33553 1252 lq_sta->last_rate_n_flags = ucode_rate;
2fd647f8 1253 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
8ca151b5
JB		 1254done:
1255 /* See if there's a better rate or modulation mode to try. */
8dfc2751 1256 if (sta->supp_rates[info->band])
1ebc8f2e
ES		 1257 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1258}
1259
1260/*
1261 * mac80211 sends us Tx status
1262 */
1263static void rs_mac80211_tx_status(void *mvm_r,
1264 struct ieee80211_supported_band *sband,
1265 struct ieee80211_sta *sta, void *priv_sta,
1266 struct sk_buff *skb)
1267{
1268 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1269 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1270 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1271 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1272
1273 if (!ieee80211_is_data(hdr->frame_control) ||
1274 info->flags & IEEE80211_TX_CTL_NO_ACK)
1275 return;
1276
1277 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
8ca151b5
JB		 1278}
1279
1280/*
1281 * Begin a period of staying with a selected modulation mode.
1282 * Set "stay_in_tbl" flag to prevent any mode switches.
1283 * Set frame tx success limits according to legacy vs. high-throughput,
1284 * and reset overall (spanning all rates) tx success history statistics.
1285 * These control how long we stay using same modulation mode before
1286 * searching for a new mode.
1287 */
1288static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1289 struct iwl_lq_sta *lq_sta)
1290{
b3b06a32
ES		 1291 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1292 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
8ca151b5 1293 if (is_legacy) {
834437da
ES		 1294 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1295 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1296 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
8ca151b5 1297 } else {
834437da
ES		 1298 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1299 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1300 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
8ca151b5
JB		 1301 }
1302 lq_sta->table_count = 0;
1303 lq_sta->total_failed = 0;
1304 lq_sta->total_success = 0;
1305 lq_sta->flush_timer = jiffies;
b3b06a32 1306 lq_sta->visited_columns = 0;
8ca151b5
JB		 1307}
1308
6a028d9a
ES		 1309static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1310{
1311 if (rate_mask)
1312 return find_last_bit(&rate_mask, BITS_PER_LONG);
1313 return IWL_RATE_INVALID;
1314}
1315
198266a3
ES		 1316static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1317 const struct rs_tx_column *column)
1318{
1319 switch (column->mode) {
1320 case RS_LEGACY:
1321 return lq_sta->max_legacy_rate_idx;
1322 case RS_SISO:
1323 return lq_sta->max_siso_rate_idx;
1324 case RS_MIMO2:
1325 return lq_sta->max_mimo2_rate_idx;
1326 default:
1327 WARN_ON_ONCE(1);
1328 }
1329
1330 return lq_sta->max_legacy_rate_idx;
1331}
1332
a34529e8 1333static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
198266a3
ES		 1334 const struct rs_tx_column *column,
1335 u32 bw)
8ca151b5
JB		 1336{
1337 /* Used to choose among HT tables */
a34529e8 1338 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
8ca151b5 1339
b3b06a32
ES		 1340 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1341 column->mode != RS_SISO &&
1342 column->mode != RS_MIMO2))
1343 return expected_tpt_legacy;
8ca151b5
JB		 1344
1345 /* Legacy rates have only one table */
b3b06a32
ES		 1346 if (column->mode == RS_LEGACY)
1347 return expected_tpt_legacy;
8ca151b5 1348
d310e405 1349 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
8ca151b5 1350 /* Choose among many HT tables depending on number of streams
d310e405 1351 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
8ca151b5 1352 * status */
b3b06a32
ES		 1353 if (column->mode == RS_SISO) {
1354 switch (bw) {
d310e405
ES		 1355 case RATE_MCS_CHAN_WIDTH_20:
1356 ht_tbl_pointer = expected_tpt_siso_20MHz;
1357 break;
1358 case RATE_MCS_CHAN_WIDTH_40:
1359 ht_tbl_pointer = expected_tpt_siso_40MHz;
1360 break;
1361 case RATE_MCS_CHAN_WIDTH_80:
1362 ht_tbl_pointer = expected_tpt_siso_80MHz;
1363 break;
1364 default:
1365 WARN_ON_ONCE(1);
1366 }
b3b06a32
ES		 1367 } else if (column->mode == RS_MIMO2) {
1368 switch (bw) {
d310e405
ES		 1369 case RATE_MCS_CHAN_WIDTH_20:
1370 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1371 break;
1372 case RATE_MCS_CHAN_WIDTH_40:
1373 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1374 break;
1375 case RATE_MCS_CHAN_WIDTH_80:
1376 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1377 break;
1378 default:
1379 WARN_ON_ONCE(1);
1380 }
1381 } else {
1382 WARN_ON_ONCE(1);
d972ab31 1383 }
8ca151b5 1384
b3b06a32
ES		 1385 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1386 return ht_tbl_pointer[0];
1387 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1388 return ht_tbl_pointer[1];
1389 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1390 return ht_tbl_pointer[2];
8ca151b5 1391 else /* AGG+SGI */
b3b06a32
ES		 1392 return ht_tbl_pointer[3];
1393}
1394
1395static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1396 struct iwl_scale_tbl_info *tbl)
1397{
1398 struct rs_rate *rate = &tbl->rate;
1399 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1400
1401 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
8ca151b5
JB		 1402}
1403
8ca151b5
JB		 1404static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1405 struct iwl_lq_sta *lq_sta,
1406 struct iwl_scale_tbl_info *tbl, /* "search" */
80763515 1407 unsigned long rate_mask, s8 index)
8ca151b5 1408{
8ca151b5
JB		 1409 struct iwl_scale_tbl_info *active_tbl =
1410 &(lq_sta->lq_info[lq_sta->active_tbl]);
80763515
ES		 1411 s32 success_ratio = active_tbl->win[index].success_ratio;
1412 u16 expected_current_tpt = active_tbl->expected_tpt[index];
a34529e8 1413 const u16 *tpt_tbl = tbl->expected_tpt;
8ca151b5 1414 u16 high_low;
80763515
ES		 1415 u32 target_tpt;
1416 int rate_idx;
8ca151b5 1417
834437da 1418 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
80763515
ES		 1419 target_tpt = 100 * expected_current_tpt;
1420 IWL_DEBUG_RATE(mvm,
1421 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1422 success_ratio, target_tpt);
1423 } else {
1424 target_tpt = lq_sta->last_tpt;
1425 IWL_DEBUG_RATE(mvm,
1426 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1427 success_ratio, target_tpt);
1428 }
8ca151b5 1429
80763515 1430 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
8ca151b5 1431
80763515
ES		 1432 while (rate_idx != IWL_RATE_INVALID) {
1433 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1434 break;
8ca151b5 1435
80763515
ES		 1436 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1437 tbl->rate.type);
8ca151b5 1438
80763515 1439 rate_idx = (high_low >> 8) & 0xff;
8ca151b5
JB		 1440 }
1441
80763515
ES		 1442 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1443 rate_idx, target_tpt,
1444 rate_idx != IWL_RATE_INVALID ?
1445 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1446
1447 return rate_idx;
8ca151b5
JB		 1448}
1449
5aa33553 1450static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
d310e405
ES		 1451{
1452 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
5aa33553 1453 return RATE_MCS_CHAN_WIDTH_80;
d310e405 1454 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
5aa33553
ES		 1455 return RATE_MCS_CHAN_WIDTH_40;
1456
1457 return RATE_MCS_CHAN_WIDTH_20;
d310e405
ES		 1458}
1459
8ca151b5
JB		 1460/*
1461 * Check whether we should continue using same modulation mode, or
1462 * begin search for a new mode, based on:
1463 * 1) # tx successes or failures while using this mode
1464 * 2) # times calling this function
1465 * 3) elapsed time in this mode (not used, for now)
1466 */
1467static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1468{
1469 struct iwl_scale_tbl_info *tbl;
8ca151b5
JB		 1470 int active_tbl;
1471 int flush_interval_passed = 0;
1472 struct iwl_mvm *mvm;
1473
ae969afe 1474 mvm = lq_sta->pers.drv;
8ca151b5
JB		 1475 active_tbl = lq_sta->active_tbl;
1476
1477 tbl = &(lq_sta->lq_info[active_tbl]);
1478
1479 /* If we've been disallowing search, see if we should now allow it */
b3b06a32 1480 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1481 /* Elapsed time using current modulation mode */
1482 if (lq_sta->flush_timer)
1483 flush_interval_passed =
1484 time_after(jiffies,
1485 (unsigned long)(lq_sta->flush_timer +
834437da 1486 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
8ca151b5
JB		 1487
1488 /*
1489 * Check if we should allow search for new modulation mode.
1490 * If many frames have failed or succeeded, or we've used
1491 * this same modulation for a long time, allow search, and
1492 * reset history stats that keep track of whether we should
1493 * allow a new search. Also (below) reset all bitmaps and
1494 * stats in active history.
1495 */
1496 if (force_search ||
1497 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1498 (lq_sta->total_success > lq_sta->max_success_limit) ||
1499 ((!lq_sta->search_better_tbl) &&
1500 (lq_sta->flush_timer) && (flush_interval_passed))) {
1501 IWL_DEBUG_RATE(mvm,
1502 "LQ: stay is expired %d %d %d\n",
1503 lq_sta->total_failed,
1504 lq_sta->total_success,
1505 flush_interval_passed);
1506
1507 /* Allow search for new mode */
b3b06a32
ES		 1508 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1509 IWL_DEBUG_RATE(mvm,
1510 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
8ca151b5
JB		 1511 lq_sta->total_failed = 0;
1512 lq_sta->total_success = 0;
1513 lq_sta->flush_timer = 0;
b3b06a32
ES		 1514 /* mark the current column as visited */
1515 lq_sta->visited_columns = BIT(tbl->column);
8ca151b5
JB		 1516 /*
1517 * Else if we've used this modulation mode enough repetitions
1518 * (regardless of elapsed time or success/failure), reset
1519 * history bitmaps and rate-specific stats for all rates in
1520 * active table.
1521 */
1522 } else {
1523 lq_sta->table_count++;
1524 if (lq_sta->table_count >=
1525 lq_sta->table_count_limit) {
1526 lq_sta->table_count = 0;
1527
1528 IWL_DEBUG_RATE(mvm,
1529 "LQ: stay in table clear win\n");
b804eeb6 1530 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1531 }
1532 }
1533
1534 /* If transitioning to allow "search", reset all history
1535 * bitmaps and stats in active table (this will become the new
1536 * "search" table). */
b3b06a32 1537 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
b804eeb6 1538 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1539 }
1540 }
1541}
1542
1543/*
1544 * setup rate table in uCode
1545 */
1546static void rs_update_rate_tbl(struct iwl_mvm *mvm,
9145d151 1547 struct ieee80211_sta *sta,
8ca151b5 1548 struct iwl_lq_sta *lq_sta,
5aa33553 1549 struct rs_rate *rate)
8ca151b5 1550{
8fc7c58c 1551 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
9e680946 1552 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1553}
1554
b3b06a32
ES		 1555static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1556 struct iwl_lq_sta *lq_sta,
1557 struct ieee80211_sta *sta,
1558 struct iwl_scale_tbl_info *tbl)
1559{
198266a3 1560 int i, j, max_rate;
b3b06a32
ES		 1561 enum rs_column next_col_id;
1562 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1563 const struct rs_tx_column *next_col;
1564 allow_column_func_t allow_func;
a0544272 1565 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
a34529e8 1566 const u16 *expected_tpt_tbl;
198266a3 1567 u16 tpt, max_expected_tpt;
b3b06a32
ES		 1568
1569 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1570 next_col_id = curr_col->next_columns[i];
1571
1572 if (next_col_id == RS_COLUMN_INVALID)
1573 continue;
1574
1575 if (lq_sta->visited_columns & BIT(next_col_id)) {
1576 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1577 next_col_id);
1578 continue;
1579 }
1580
1581 next_col = &rs_tx_columns[next_col_id];
1582
1583 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1584 IWL_DEBUG_RATE(mvm,
1585 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1586 next_col_id, valid_ants, next_col->ant);
1587 continue;
1588 }
1589
1590 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1591 allow_func = next_col->checks[j];
1592 if (allow_func && !allow_func(mvm, sta, tbl))
1593 break;
1594 }
1595
1596 if (j != MAX_COLUMN_CHECKS) {
1597 IWL_DEBUG_RATE(mvm,
1598 "Skip column %d: not allowed (check %d failed)\n",
1599 next_col_id, j);
1600
1601 continue;
1602 }
1603
1604 tpt = lq_sta->last_tpt / 100;
1605 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
049e0c33 1606 rs_bw_from_sta_bw(sta));
b3b06a32
ES		 1607 if (WARN_ON_ONCE(!expected_tpt_tbl))
1608 continue;
1609
198266a3 1610 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
6a028d9a
ES		 1611 if (max_rate == IWL_RATE_INVALID) {
1612 IWL_DEBUG_RATE(mvm,
1613 "Skip column %d: no rate is allowed in this column\n",
1614 next_col_id);
198266a3 1615 continue;
6a028d9a 1616 }
b3b06a32 1617
198266a3 1618 max_expected_tpt = expected_tpt_tbl[max_rate];
b3b06a32
ES		 1619 if (tpt >= max_expected_tpt) {
1620 IWL_DEBUG_RATE(mvm,
1621 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1622 next_col_id, max_expected_tpt, tpt);
1623 continue;
1624 }
1625
198266a3
ES		 1626 IWL_DEBUG_RATE(mvm,
1627 "Found potential column %d. Max expected %d current %d\n",
1628 next_col_id, max_expected_tpt, tpt);
b3b06a32
ES		 1629 break;
1630 }
1631
1632 if (i == MAX_NEXT_COLUMNS)
1633 return RS_COLUMN_INVALID;
1634
b3b06a32
ES		 1635 return next_col_id;
1636}
1637
1638static int rs_switch_to_column(struct iwl_mvm *mvm,
1639 struct iwl_lq_sta *lq_sta,
1640 struct ieee80211_sta *sta,
1641 enum rs_column col_id)
1642{
1643 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1644 struct iwl_scale_tbl_info *search_tbl =
1645 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1646 struct rs_rate *rate = &search_tbl->rate;
1647 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1648 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1649 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1650 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
80763515 1651 unsigned long rate_mask = 0;
b3b06a32
ES		 1652 u32 rate_idx = 0;
1653
1654 memcpy(search_tbl, tbl, sz);
1655
1656 rate->sgi = column->sgi;
1657 rate->ant = column->ant;
1658
1659 if (column->mode == RS_LEGACY) {
1660 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1661 rate->type = LQ_LEGACY_A;
1662 else
1663 rate->type = LQ_LEGACY_G;
1664
d8bafeaf
ES		 1665 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1666 rate->ldpc = false;
b3b06a32
ES		 1667 rate_mask = lq_sta->active_legacy_rate;
1668 } else if (column->mode == RS_SISO) {
1669 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1670 rate_mask = lq_sta->active_siso_rate;
1671 } else if (column->mode == RS_MIMO2) {
1672 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1673 rate_mask = lq_sta->active_mimo2_rate;
1674 } else {
1675 WARN_ON_ONCE("Bad column mode");
1676 }
1677
d8bafeaf
ES		 1678 if (column->mode != RS_LEGACY) {
1679 rate->bw = rs_bw_from_sta_bw(sta);
1680 rate->ldpc = lq_sta->ldpc;
1681 }
1682
b3b06a32
ES		 1683 search_tbl->column = col_id;
1684 rs_set_expected_tpt_table(lq_sta, search_tbl);
1685
75d3e2d6
ES		 1686 lq_sta->visited_columns |= BIT(col_id);
1687
b3b06a32
ES		 1688 /* Get the best matching rate if we're changing modes. e.g.
1689 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1690 */
1691 if (curr_column->mode != column->mode) {
1692 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1693 rate_mask, rate->index);
1694
1695 if ((rate_idx == IWL_RATE_INVALID) ||
1696 !(BIT(rate_idx) & rate_mask)) {
1697 IWL_DEBUG_RATE(mvm,
1698 "can not switch with index %d"
80763515 1699 " rate mask %lx\n",
b3b06a32
ES		 1700 rate_idx, rate_mask);
1701
1702 goto err;
1703 }
1704
1705 rate->index = rate_idx;
1706 }
1707
b3b06a32
ES		 1708 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1709 col_id, rate->index);
1710
b3b06a32
ES		 1711 return 0;
1712
1713err:
1714 rate->type = LQ_NONE;
1715 return -1;
1716}
1717
4e4b815c
ES		 1718static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1719 struct iwl_scale_tbl_info *tbl,
1720 s32 sr, int low, int high,
1721 int current_tpt,
1722 int low_tpt, int high_tpt)
1723{
1724 enum rs_action action = RS_ACTION_STAY;
1725
834437da
ES		 1726 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1727 (current_tpt == 0)) {
4e4b815c 1728 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1729 "Decrease rate because of low SR\n");
1730 return RS_ACTION_DOWNSCALE;
4e4b815c
ES		 1731 }
1732
e53839eb
ES		 1733 if ((low_tpt == IWL_INVALID_VALUE) &&
1734 (high_tpt == IWL_INVALID_VALUE) &&
1735 (high != IWL_RATE_INVALID)) {
4e4b815c 1736 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1737 "No data about high/low rates. Increase rate\n");
1738 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1739 }
1740
e53839eb
ES		 1741 if ((high_tpt == IWL_INVALID_VALUE) &&
1742 (high != IWL_RATE_INVALID) &&
1743 (low_tpt != IWL_INVALID_VALUE) &&
1744 (low_tpt < current_tpt)) {
1745 IWL_DEBUG_RATE(mvm,
1746 "No data about high rate and low rate is worse. Increase rate\n");
1747 return RS_ACTION_UPSCALE;
1748 }
4e4b815c 1749
e53839eb
ES		 1750 if ((high_tpt != IWL_INVALID_VALUE) &&
1751 (high_tpt > current_tpt)) {
1752 IWL_DEBUG_RATE(mvm,
1753 "Higher rate is better. Increate rate\n");
1754 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1755 }
1756
e53839eb
ES		 1757 if ((low_tpt != IWL_INVALID_VALUE) &&
1758 (high_tpt != IWL_INVALID_VALUE) &&
1759 (low_tpt < current_tpt) &&
1760 (high_tpt < current_tpt)) {
4e4b815c 1761 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1762 "Both high and low are worse. Maintain rate\n");
1763 return RS_ACTION_STAY;
1764 }
1765
1766 if ((low_tpt != IWL_INVALID_VALUE) &&
1767 (low_tpt > current_tpt)) {
1768 IWL_DEBUG_RATE(mvm,
1769 "Lower rate is better\n");
1770 action = RS_ACTION_DOWNSCALE;
1771 goto out;
1772 }
1773
1774 if ((low_tpt == IWL_INVALID_VALUE) &&
1775 (low != IWL_RATE_INVALID)) {
4e4b815c 1776 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1777 "No data about lower rate\n");
1778 action = RS_ACTION_DOWNSCALE;
1779 goto out;
1780 }
1781
1782 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1783
1784out:
1785 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
834437da 1786 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
e53839eb
ES		 1787 IWL_DEBUG_RATE(mvm,
1788 "SR is above NO DECREASE. Avoid downscale\n");
1789 action = RS_ACTION_STAY;
1790 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1791 IWL_DEBUG_RATE(mvm,
1792 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1793 action = RS_ACTION_STAY;
1794 } else {
1795 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1796 }
4e4b815c
ES		 1797 }
1798
1799 return action;
1800}
b3b06a32 1801
d8bafeaf
ES		 1802static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1803 struct iwl_lq_sta *lq_sta)
1804{
d8bafeaf
ES		 1805 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1806 * supports STBC of at least 1*SS
1807 */
1808 if (!lq_sta->stbc)
1809 return false;
1810
d8bafeaf
ES		 1811 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1812 return false;
1813
1814 return true;
1815}
1816
2fd647f8
EP		 1817static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1818 int *weaker, int *stronger)
1819{
834437da 1820 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2fd647f8
EP		 1821 if (*weaker > TPC_MAX_REDUCTION)
1822 *weaker = TPC_INVALID;
1823
834437da 1824 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2fd647f8
EP		 1825 if (*stronger < 0)
1826 *stronger = TPC_INVALID;
1827}
1828
1e9551de
ES		 1829static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1830 struct rs_rate *rate, enum ieee80211_band band)
2fd647f8
EP		 1831{
1832 int index = rate->index;
1e9551de
ES		 1833 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1834 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1835 !vif->bss_conf.ps);
2fd647f8 1836
1e9551de
ES		 1837 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1838 cam, sta_ps_disabled);
2fd647f8
EP		 1839 /*
1840 * allow tpc only if power management is enabled, or bt coex
1841 * activity grade allows it and we are on 2.4Ghz.
1842 */
1e9551de 1843 if ((cam || sta_ps_disabled) &&
2fd647f8
EP		 1844 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1845 return false;
1846
1847 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1848 if (is_legacy(rate))
1849 return index == IWL_RATE_54M_INDEX;
1850 if (is_ht(rate))
1851 return index == IWL_RATE_MCS_7_INDEX;
1852 if (is_vht(rate))
1853 return index == IWL_RATE_MCS_7_INDEX ||
1854 index == IWL_RATE_MCS_8_INDEX ||
1855 index == IWL_RATE_MCS_9_INDEX;
1856
1857 WARN_ON_ONCE(1);
1858 return false;
1859}
1860
1861enum tpc_action {
1862 TPC_ACTION_STAY,
1863 TPC_ACTION_DECREASE,
1864 TPC_ACTION_INCREASE,
1865 TPC_ACTION_NO_RESTIRCTION,
1866};
1867
1868static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1869 s32 sr, int weak, int strong,
1870 int current_tpt,
1871 int weak_tpt, int strong_tpt)
1872{
1873 /* stay until we have valid tpt */
1874 if (current_tpt == IWL_INVALID_VALUE) {
1875 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1876 return TPC_ACTION_STAY;
1877 }
1878
1879 /* Too many failures, increase txp */
834437da
ES		 1880 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1881 current_tpt == 0) {
2fd647f8
EP		 1882 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1883 return TPC_ACTION_NO_RESTIRCTION;
1884 }
1885
1886 /* try decreasing first if applicable */
1887 if (weak != TPC_INVALID) {
1888 if (weak_tpt == IWL_INVALID_VALUE &&
1889 (strong_tpt == IWL_INVALID_VALUE ||
1890 current_tpt >= strong_tpt)) {
1891 IWL_DEBUG_RATE(mvm,
1892 "no weak txp measurement. decrease txp\n");
1893 return TPC_ACTION_DECREASE;
1894 }
1895
1896 if (weak_tpt > current_tpt) {
1897 IWL_DEBUG_RATE(mvm,
1898 "lower txp has better tpt. decrease txp\n");
1899 return TPC_ACTION_DECREASE;
1900 }
1901 }
1902
1903 /* next, increase if needed */
834437da
ES		 1904 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1905 strong != TPC_INVALID) {
2fd647f8
EP		 1906 if (weak_tpt == IWL_INVALID_VALUE &&
1907 strong_tpt != IWL_INVALID_VALUE &&
1908 current_tpt < strong_tpt) {
1909 IWL_DEBUG_RATE(mvm,
1910 "higher txp has better tpt. increase txp\n");
1911 return TPC_ACTION_INCREASE;
1912 }
1913
1914 if (weak_tpt < current_tpt &&
1915 (strong_tpt == IWL_INVALID_VALUE ||
1916 strong_tpt > current_tpt)) {
1917 IWL_DEBUG_RATE(mvm,
1918 "lower txp has worse tpt. increase txp\n");
1919 return TPC_ACTION_INCREASE;
1920 }
1921 }
1922
1923 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1924 return TPC_ACTION_STAY;
1925}
1926
1927static bool rs_tpc_perform(struct iwl_mvm *mvm,
1928 struct ieee80211_sta *sta,
1929 struct iwl_lq_sta *lq_sta,
1930 struct iwl_scale_tbl_info *tbl)
1931{
9d8ce6af 1932 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2fd647f8
EP		 1933 struct ieee80211_vif *vif = mvm_sta->vif;
1934 struct ieee80211_chanctx_conf *chanctx_conf;
1935 enum ieee80211_band band;
1936 struct iwl_rate_scale_data *window;
1937 struct rs_rate *rate = &tbl->rate;
1938 enum tpc_action action;
1939 s32 sr;
1940 u8 cur = lq_sta->lq.reduced_tpc;
1941 int current_tpt;
1942 int weak, strong;
1943 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1944
9a75b3df 1945#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 1946 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
3c6acb61 1947 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
ae969afe
EP		 1948 lq_sta->pers.dbg_fixed_txp_reduction);
1949 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1950 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
9a75b3df
EP		 1951 }
1952#endif
1953
2fd647f8
EP		 1954 rcu_read_lock();
1955 chanctx_conf = rcu_dereference(vif->chanctx_conf);
1956 if (WARN_ON(!chanctx_conf))
1957 band = IEEE80211_NUM_BANDS;
1958 else
1959 band = chanctx_conf->def.chan->band;
1960 rcu_read_unlock();
1961
1e9551de 1962 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2fd647f8 1963 IWL_DEBUG_RATE(mvm,
3c6acb61 1964 "tpc is not allowed. remove txp restrictions\n");
2fd647f8
EP		 1965 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1966 return cur != TPC_NO_REDUCTION;
1967 }
1968
1969 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1970
1971 /* Collect measured throughputs for current and adjacent rates */
1972 window = tbl->tpc_win;
1973 sr = window[cur].success_ratio;
1974 current_tpt = window[cur].average_tpt;
1975 if (weak != TPC_INVALID)
1976 weak_tpt = window[weak].average_tpt;
1977 if (strong != TPC_INVALID)
1978 strong_tpt = window[strong].average_tpt;
1979
1980 IWL_DEBUG_RATE(mvm,
1981 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1982 cur, current_tpt, sr, weak, strong,
1983 weak_tpt, strong_tpt);
1984
1985 action = rs_get_tpc_action(mvm, sr, weak, strong,
1986 current_tpt, weak_tpt, strong_tpt);
1987
1988 /* override actions if we are on the edge */
1989 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
3c6acb61 1990 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2fd647f8
EP		 1991 action = TPC_ACTION_STAY;
1992 } else if (strong == TPC_INVALID &&
1993 (action == TPC_ACTION_INCREASE ||
1994 action == TPC_ACTION_NO_RESTIRCTION)) {
3c6acb61 1995 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2fd647f8
EP		 1996 action = TPC_ACTION_STAY;
1997 }
1998
1999 switch (action) {
2000 case TPC_ACTION_DECREASE:
2001 lq_sta->lq.reduced_tpc = weak;
2002 return true;
2003 case TPC_ACTION_INCREASE:
2004 lq_sta->lq.reduced_tpc = strong;
2005 return true;
2006 case TPC_ACTION_NO_RESTIRCTION:
2007 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2008 return true;
2009 case TPC_ACTION_STAY:
2010 /* do nothing */
2011 break;
2012 }
2013 return false;
2014}
2015
8ca151b5
JB		 2016/*
2017 * Do rate scaling and search for new modulation mode.
2018 */
2019static void rs_rate_scale_perform(struct iwl_mvm *mvm,
8ca151b5 2020 struct ieee80211_sta *sta,
1ebc8f2e
ES		 2021 struct iwl_lq_sta *lq_sta,
2022 int tid)
8ca151b5 2023{
8ca151b5
JB		 2024 int low = IWL_RATE_INVALID;
2025 int high = IWL_RATE_INVALID;
2026 int index;
8ca151b5
JB		 2027 struct iwl_rate_scale_data *window = NULL;
2028 int current_tpt = IWL_INVALID_VALUE;
2029 int low_tpt = IWL_INVALID_VALUE;
2030 int high_tpt = IWL_INVALID_VALUE;
2031 u32 fail_count;
4e4b815c 2032 enum rs_action scale_action = RS_ACTION_STAY;
8ca151b5
JB		 2033 u16 rate_mask;
2034 u8 update_lq = 0;
2035 struct iwl_scale_tbl_info *tbl, *tbl1;
8ca151b5
JB		 2036 u8 active_tbl = 0;
2037 u8 done_search = 0;
2038 u16 high_low;
2039 s32 sr;
9d015a03 2040 u8 prev_agg = lq_sta->is_agg;
9d8ce6af 2041 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
8ca151b5 2042 struct iwl_mvm_tid_data *tid_data;
5aa33553 2043 struct rs_rate *rate;
8ca151b5 2044
efed6640 2045 lq_sta->is_agg = !!sta_priv->agg_tids;
8ca151b5
JB		 2046
2047 /*
2048 * Select rate-scale / modulation-mode table to work with in
2049 * the rest of this function: "search" if searching for better
2050 * modulation mode, or "active" if doing rate scaling within a mode.
2051 */
2052 if (!lq_sta->search_better_tbl)
2053 active_tbl = lq_sta->active_tbl;
2054 else
2055 active_tbl = 1 - lq_sta->active_tbl;
2056
2057 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2058 rate = &tbl->rate;
8ca151b5 2059
9d015a03
ES		 2060 if (prev_agg != lq_sta->is_agg) {
2061 IWL_DEBUG_RATE(mvm,
2062 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2063 prev_agg, lq_sta->is_agg);
2064 rs_set_expected_tpt_table(lq_sta, tbl);
b804eeb6 2065 rs_rate_scale_clear_tbl_windows(mvm, tbl);
9d015a03
ES		 2066 }
2067
8ca151b5
JB		 2068 /* current tx rate */
2069 index = lq_sta->last_txrate_idx;
2070
8ca151b5 2071 /* rates available for this association, and for modulation mode */
a8ff14f5 2072 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5 2073
ca6f38ff 2074 if (!(BIT(index) & rate_mask)) {
8ca151b5
JB		 2075 IWL_ERR(mvm, "Current Rate is not valid\n");
2076 if (lq_sta->search_better_tbl) {
2077 /* revert to active table if search table is not valid*/
5aa33553 2078 rate->type = LQ_NONE;
8ca151b5
JB		 2079 lq_sta->search_better_tbl = 0;
2080 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 2081 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
8ca151b5
JB		 2082 }
2083 return;
2084 }
2085
2086 /* Get expected throughput table and history window for current rate */
2087 if (!tbl->expected_tpt) {
2088 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2089 return;
2090 }
2091
2536e7c3 2092 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2093 window = &(tbl->win[index]);
2094
2095 /*
2096 * If there is not enough history to calculate actual average
2097 * throughput, keep analyzing results of more tx frames, without
2098 * changing rate or mode (bypass most of the rest of this function).
2099 * Set up new rate table in uCode only if old rate is not supported
2100 * in current association (use new rate found above).
2101 */
2102 fail_count = window->counter - window->success_counter;
834437da
ES		 2103 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2104 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
8ca151b5 2105 IWL_DEBUG_RATE(mvm,
4d30ee82 2106 "(%s: %d): Test Window: succ %d total %d\n",
5aa33553 2107 rs_pretty_lq_type(rate->type),
4d30ee82 2108 index, window->success_counter, window->counter);
8ca151b5
JB		 2109
2110 /* Can't calculate this yet; not enough history */
2111 window->average_tpt = IWL_INVALID_VALUE;
2112
2113 /* Should we stay with this modulation mode,
2114 * or search for a new one? */
2115 rs_stay_in_table(lq_sta, false);
2116
2117 goto out;
2118 }
2119 /* Else we have enough samples; calculate estimate of
2120 * actual average throughput */
2121 if (window->average_tpt != ((window->success_ratio *
2122 tbl->expected_tpt[index] + 64) / 128)) {
8ca151b5
JB		 2123 window->average_tpt = ((window->success_ratio *
2124 tbl->expected_tpt[index] + 64) / 128);
2125 }
2126
2127 /* If we are searching for better modulation mode, check success. */
2128 if (lq_sta->search_better_tbl) {
2129 /* If good success, continue using the "search" mode;
2130 * no need to send new link quality command, since we're
2131 * continuing to use the setup that we've been trying. */
2132 if (window->average_tpt > lq_sta->last_tpt) {
2133 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2134 "SWITCHING TO NEW TABLE SR: %d "
2135 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2136 window->success_ratio,
2137 window->average_tpt,
2138 lq_sta->last_tpt);
2139
8ca151b5
JB		 2140 /* Swap tables; "search" becomes "active" */
2141 lq_sta->active_tbl = active_tbl;
2142 current_tpt = window->average_tpt;
2143 /* Else poor success; go back to mode in "active" table */
2144 } else {
2145 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2146 "GOING BACK TO THE OLD TABLE: SR %d "
2147 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2148 window->success_ratio,
2149 window->average_tpt,
2150 lq_sta->last_tpt);
2151
2152 /* Nullify "search" table */
5aa33553 2153 rate->type = LQ_NONE;
8ca151b5
JB		 2154
2155 /* Revert to "active" table */
2156 active_tbl = lq_sta->active_tbl;
2157 tbl = &(lq_sta->lq_info[active_tbl]);
2158
2159 /* Revert to "active" rate and throughput info */
8fc7c58c 2160 index = tbl->rate.index;
8ca151b5
JB		 2161 current_tpt = lq_sta->last_tpt;
2162
2163 /* Need to set up a new rate table in uCode */
2164 update_lq = 1;
2165 }
2166
2167 /* Either way, we've made a decision; modulation mode
2168 * search is done, allow rate adjustment next time. */
2169 lq_sta->search_better_tbl = 0;
2170 done_search = 1; /* Don't switch modes below! */
2171 goto lq_update;
2172 }
2173
2174 /* (Else) not in search of better modulation mode, try for better
2175 * starting rate, while staying in this mode. */
ca6f38ff 2176 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
8ca151b5
JB		 2177 low = high_low & 0xff;
2178 high = (high_low >> 8) & 0xff;
2179
2536e7c3 2180 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2181
2182 sr = window->success_ratio;
2183
2184 /* Collect measured throughputs for current and adjacent rates */
2185 current_tpt = window->average_tpt;
2186 if (low != IWL_RATE_INVALID)
2187 low_tpt = tbl->win[low].average_tpt;
2188 if (high != IWL_RATE_INVALID)
2189 high_tpt = tbl->win[high].average_tpt;
2190
4d30ee82
ES		 2191 IWL_DEBUG_RATE(mvm,
2192 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
5aa33553
ES		 2193 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2194 low, high, low_tpt, high_tpt);
4d30ee82 2195
4e4b815c
ES		 2196 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2197 current_tpt, low_tpt, high_tpt);
8ca151b5 2198
393b9e5b 2199 /* Force a search in case BT doesn't like us being in MIMO */
5aa33553 2200 if (is_mimo(rate) &&
393b9e5b 2201 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
4d30ee82
ES		 2202 IWL_DEBUG_RATE(mvm,
2203 "BT Coex forbids MIMO. Search for new config\n");
36946ce6
EG		 2204 rs_stay_in_table(lq_sta, true);
2205 goto lq_update;
2206 }
2207
8ca151b5 2208 switch (scale_action) {
4e4b815c 2209 case RS_ACTION_DOWNSCALE:
8ca151b5
JB		 2210 /* Decrease starting rate, update uCode's rate table */
2211 if (low != IWL_RATE_INVALID) {
2212 update_lq = 1;
2213 index = low;
4d30ee82
ES		 2214 } else {
2215 IWL_DEBUG_RATE(mvm,
2216 "At the bottom rate. Can't decrease\n");
8ca151b5
JB		 2217 }
2218
2219 break;
4e4b815c 2220 case RS_ACTION_UPSCALE:
8ca151b5
JB		 2221 /* Increase starting rate, update uCode's rate table */
2222 if (high != IWL_RATE_INVALID) {
2223 update_lq = 1;
2224 index = high;
4d30ee82
ES		 2225 } else {
2226 IWL_DEBUG_RATE(mvm,
2227 "At the top rate. Can't increase\n");
8ca151b5
JB		 2228 }
2229
2230 break;
4e4b815c 2231 case RS_ACTION_STAY:
8ca151b5 2232 /* No change */
e6c8d602
ES		 2233 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2234 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2fd647f8 2235 break;
8ca151b5
JB		 2236 default:
2237 break;
2238 }
2239
8ca151b5
JB		 2240lq_update:
2241 /* Replace uCode's rate table for the destination station. */
5aa33553
ES		 2242 if (update_lq) {
2243 tbl->rate.index = index;
2244 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2245 }
8ca151b5
JB		 2246
2247 rs_stay_in_table(lq_sta, false);
2248
2249 /*
2250 * Search for new modulation mode if we're:
2251 * 1) Not changing rates right now
2252 * 2) Not just finishing up a search
2253 * 3) Allowing a new search
2254 */
2255 if (!update_lq && !done_search &&
b3b06a32
ES		 2256 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2257 && window->counter) {
2258 enum rs_column next_column;
2259
8ca151b5
JB		 2260 /* Save current throughput to compare with "search" throughput*/
2261 lq_sta->last_tpt = current_tpt;
2262
4d30ee82 2263 IWL_DEBUG_RATE(mvm,
b3b06a32
ES		 2264 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2265 update_lq, done_search, lq_sta->rs_state,
4d30ee82 2266 window->counter);
b3b06a32
ES		 2267
2268 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2269 if (next_column != RS_COLUMN_INVALID) {
2270 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2271 next_column);
2272 if (!ret)
2273 lq_sta->search_better_tbl = 1;
2274 } else {
2275 IWL_DEBUG_RATE(mvm,
2276 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2277 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2278 }
8ca151b5
JB		 2279
2280 /* If new "search" mode was selected, set up in uCode table */
2281 if (lq_sta->search_better_tbl) {
2282 /* Access the "search" table, clear its history. */
2283 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b804eeb6 2284 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 2285
2286 /* Use new "search" start rate */
8fc7c58c 2287 index = tbl->rate.index;
8ca151b5 2288
b3b06a32
ES		 2289 rs_dump_rate(mvm, &tbl->rate,
2290 "Switch to SEARCH TABLE:");
8fc7c58c 2291 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
9e680946 2292 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 2293 } else {
2294 done_search = 1;
2295 }
2296 }
2297
b3b06a32 2298 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
8ca151b5
JB		 2299 /* If the "active" (non-search) mode was legacy,
2300 * and we've tried switching antennas,
2301 * but we haven't been able to try HT modes (not available),
2302 * stay with best antenna legacy modulation for a while
2303 * before next round of mode comparisons. */
2304 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
fd7dbee5 2305 if (is_legacy(&tbl1->rate)) {
8ca151b5 2306 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
fd7dbee5
ES		 2307
2308 if (tid != IWL_MAX_TID_COUNT) {
2309 tid_data = &sta_priv->tid_data[tid];
2310 if (tid_data->state != IWL_AGG_OFF) {
2311 IWL_DEBUG_RATE(mvm,
2312 "Stop aggregation on tid %d\n",
2313 tid);
2314 ieee80211_stop_tx_ba_session(sta, tid);
2315 }
2316 }
8ca151b5 2317 rs_set_stay_in_table(mvm, 1, lq_sta);
b3b06a32 2318 } else {
8ca151b5
JB		 2319 /* If we're in an HT mode, and all 3 mode switch actions
2320 * have been tried and compared, stay in this best modulation
2321 * mode for a while before next round of mode comparisons. */
8ca151b5
JB		 2322 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2323 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2324 (tid != IWL_MAX_TID_COUNT)) {
2325 tid_data = &sta_priv->tid_data[tid];
2326 if (tid_data->state == IWL_AGG_OFF) {
2327 IWL_DEBUG_RATE(mvm,
2328 "try to aggregate tid %d\n",
2329 tid);
2330 rs_tl_turn_on_agg(mvm, tid,
2331 lq_sta, sta);
2332 }
2333 }
2334 rs_set_stay_in_table(mvm, 0, lq_sta);
2335 }
2336 }
2337
2338out:
8ca151b5
JB		 2339 lq_sta->last_txrate_idx = index;
2340}
2341
361dbec8
ES		 2342struct rs_init_rate_info {
2343 s8 rssi;
2344 u8 rate_idx;
2345};
2346
2347static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2348 { -60, IWL_RATE_54M_INDEX },
2349 { -64, IWL_RATE_48M_INDEX },
2350 { -68, IWL_RATE_36M_INDEX },
2351 { -80, IWL_RATE_24M_INDEX },
2352 { -84, IWL_RATE_18M_INDEX },
2353 { -85, IWL_RATE_12M_INDEX },
2354 { -86, IWL_RATE_11M_INDEX },
2355 { -88, IWL_RATE_5M_INDEX },
2356 { -90, IWL_RATE_2M_INDEX },
2357 { S8_MIN, IWL_RATE_1M_INDEX },
2358};
2359
2360static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2361 { -60, IWL_RATE_54M_INDEX },
2362 { -64, IWL_RATE_48M_INDEX },
2363 { -72, IWL_RATE_36M_INDEX },
2364 { -80, IWL_RATE_24M_INDEX },
2365 { -84, IWL_RATE_18M_INDEX },
2366 { -85, IWL_RATE_12M_INDEX },
2367 { -87, IWL_RATE_9M_INDEX },
2368 { S8_MIN, IWL_RATE_6M_INDEX },
2369};
2370
2371/* Choose an initial legacy rate and antenna to use based on the RSSI
2372 * of last Rx
2373 */
2374static void rs_get_initial_rate(struct iwl_mvm *mvm,
2375 struct iwl_lq_sta *lq_sta,
2376 enum ieee80211_band band,
2377 struct rs_rate *rate)
2378{
2379 int i, nentries;
2380 s8 best_rssi = S8_MIN;
2381 u8 best_ant = ANT_NONE;
a0544272 2382 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
361dbec8
ES		 2383 const struct rs_init_rate_info *initial_rates;
2384
2385 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2386 if (!(lq_sta->pers.chains & BIT(i)))
2387 continue;
2388
2389 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2390 best_rssi = lq_sta->pers.chain_signal[i];
2391 best_ant = BIT(i);
2392 }
2393 }
2394
2395 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2396 rs_pretty_ant(best_ant), best_rssi);
2397
2398 if (best_ant != ANT_A && best_ant != ANT_B)
2399 rate->ant = first_antenna(valid_tx_ant);
2400 else
2401 rate->ant = best_ant;
2402
2403 rate->sgi = false;
2404 rate->ldpc = false;
2405 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2406
2407 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2408 BITS_PER_LONG);
2409
2410 if (band == IEEE80211_BAND_5GHZ) {
2411 rate->type = LQ_LEGACY_A;
2412 initial_rates = rs_init_rates_5ghz;
2413 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2414 } else {
2415 rate->type = LQ_LEGACY_G;
2416 initial_rates = rs_init_rates_24ghz;
2417 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2418 }
2419
2420 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2421 for (i = 0; i < nentries; i++) {
2422 int rate_idx = initial_rates[i].rate_idx;
2423 if ((best_rssi >= initial_rates[i].rssi) &&
2424 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2425 rate->index = rate_idx;
2426 break;
2427 }
2428 }
2429 }
2430
2431 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2432 rs_pretty_ant(rate->ant));
2433}
2434
2435/* Save info about RSSI of last Rx */
2436void rs_update_last_rssi(struct iwl_mvm *mvm,
2437 struct iwl_lq_sta *lq_sta,
2438 struct ieee80211_rx_status *rx_status)
2439{
2440 lq_sta->pers.chains = rx_status->chains;
2441 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2442 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2443 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2444}
2445
8ca151b5
JB		 2446/**
2447 * rs_initialize_lq - Initialize a station's hardware rate table
2448 *
2449 * The uCode's station table contains a table of fallback rates
2450 * for automatic fallback during transmission.
2451 *
2452 * NOTE: This sets up a default set of values. These will be replaced later
2453 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2454 * rc80211_simple.
2455 *
2456 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2457 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2458 * which requires station table entry to exist).
2459 */
2460static void rs_initialize_lq(struct iwl_mvm *mvm,
2461 struct ieee80211_sta *sta,
2462 struct iwl_lq_sta *lq_sta,
b87c2179
ES		 2463 enum ieee80211_band band,
2464 bool init)
8ca151b5
JB		 2465{
2466 struct iwl_scale_tbl_info *tbl;
5aa33553 2467 struct rs_rate *rate;
8ca151b5 2468 u8 active_tbl = 0;
8ca151b5
JB		 2469
2470 if (!sta || !lq_sta)
2471 return;
2472
8ca151b5
JB		 2473 if (!lq_sta->search_better_tbl)
2474 active_tbl = lq_sta->active_tbl;
2475 else
2476 active_tbl = 1 - lq_sta->active_tbl;
2477
2478 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2479 rate = &tbl->rate;
8ca151b5 2480
361dbec8
ES		 2481 rs_get_initial_rate(mvm, lq_sta, band, rate);
2482 lq_sta->last_txrate_idx = rate->index;
8ca151b5 2483
b3b06a32
ES		 2484 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2485 if (rate->ant == ANT_A)
2486 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2487 else
2488 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2489
8ca151b5 2490 rs_set_expected_tpt_table(lq_sta, tbl);
80e9e5cd 2491 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
8ca151b5 2492 /* TODO restore station should remember the lq cmd */
b87c2179 2493 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
8ca151b5
JB		 2494}
2495
2496static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2497 struct ieee80211_tx_rate_control *txrc)
2498{
2499 struct sk_buff *skb = txrc->skb;
8ca151b5
JB		 2500 struct iwl_op_mode *op_mode __maybe_unused =
2501 (struct iwl_op_mode *)mvm_r;
2502 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2503 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2504 struct iwl_lq_sta *lq_sta = mvm_sta;
8ca151b5 2505
2536e7c3 2506 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2507
2508 /* Treat uninitialized rate scaling data same as non-existing. */
ae969afe 2509 if (lq_sta && !lq_sta->pers.drv) {
8ca151b5
JB		 2510 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2511 mvm_sta = NULL;
2512 }
2513
2514 /* Send management frames and NO_ACK data using lowest rate. */
2515 if (rate_control_send_low(sta, mvm_sta, txrc))
2516 return;
2517
d310e405
ES		 2518 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2519 info->band, &info->control.rates[0]);
2520
622ebe99 2521 info->control.rates[0].count = 1;
8ca151b5
JB		 2522}
2523
2524static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2525 gfp_t gfp)
2526{
9d8ce6af 2527 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
ae969afe
EP		 2528 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2529 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2530 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
8ca151b5
JB		 2531
2532 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2533
ae969afe
EP		 2534 lq_sta->pers.drv = mvm;
2535#ifdef CONFIG_MAC80211_DEBUGFS
2536 lq_sta->pers.dbg_fixed_rate = 0;
2537 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2538#endif
361dbec8
ES		 2539 lq_sta->pers.chains = 0;
2540 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
ae969afe 2541
8ca151b5
JB		 2542 return &sta_priv->lq_sta;
2543}
2544
d310e405
ES		 2545static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2546 int nss)
2547{
2548 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2549 (0x3 << (2 * (nss - 1)));
2550 rx_mcs >>= (2 * (nss - 1));
2551
2552 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2553 return IWL_RATE_MCS_7_INDEX;
2554 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2555 return IWL_RATE_MCS_8_INDEX;
2556 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2557 return IWL_RATE_MCS_9_INDEX;
2558
2559 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2560 return -1;
2561}
2562
750a1b45
ES		 2563static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2564 struct ieee80211_sta_vht_cap *vht_cap,
2565 struct iwl_lq_sta *lq_sta)
2566{
2567 int i;
2568 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2569
2570 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2571 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2572 if (i == IWL_RATE_9M_INDEX)
2573 continue;
2574
271518ad
ES		 2575 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2576 if (i == IWL_RATE_MCS_9_INDEX &&
2577 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2578 continue;
2579
750a1b45
ES		 2580 lq_sta->active_siso_rate |= BIT(i);
2581 }
2582 }
2583
ecc90e79
ES		 2584 if (sta->rx_nss < 2)
2585 return;
2586
750a1b45
ES		 2587 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2588 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2589 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2590 if (i == IWL_RATE_9M_INDEX)
2591 continue;
2592
271518ad
ES		 2593 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2594 if (i == IWL_RATE_MCS_9_INDEX &&
2595 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2596 continue;
2597
750a1b45
ES		 2598 lq_sta->active_mimo2_rate |= BIT(i);
2599 }
2600 }
2601}
2602
5fc0f76c
ES		 2603#ifdef CONFIG_IWLWIFI_DEBUGFS
2604static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2605 struct iwl_mvm_frame_stats *stats)
2606{
2607 spin_lock_bh(&mvm->drv_stats_lock);
2608 memset(stats, 0, sizeof(*stats));
2609 spin_unlock_bh(&mvm->drv_stats_lock);
2610}
2611
2612void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2613 struct iwl_mvm_frame_stats *stats,
2614 u32 rate, bool agg)
2615{
2616 u8 nss = 0, mcs = 0;
2617
2618 spin_lock(&mvm->drv_stats_lock);
2619
2620 if (agg)
2621 stats->agg_frames++;
2622
2623 stats->success_frames++;
2624
2625 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2626 case RATE_MCS_CHAN_WIDTH_20:
2627 stats->bw_20_frames++;
2628 break;
2629 case RATE_MCS_CHAN_WIDTH_40:
2630 stats->bw_40_frames++;
2631 break;
2632 case RATE_MCS_CHAN_WIDTH_80:
2633 stats->bw_80_frames++;
2634 break;
2635 default:
2636 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2637 }
2638
2639 if (rate & RATE_MCS_HT_MSK) {
2640 stats->ht_frames++;
2641 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2642 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2643 } else if (rate & RATE_MCS_VHT_MSK) {
2644 stats->vht_frames++;
2645 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2646 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2647 RATE_VHT_MCS_NSS_POS) + 1;
2648 } else {
2649 stats->legacy_frames++;
2650 }
2651
2652 if (nss == 1)
2653 stats->siso_frames++;
2654 else if (nss == 2)
2655 stats->mimo2_frames++;
2656
2657 if (rate & RATE_MCS_SGI_MSK)
2658 stats->sgi_frames++;
2659 else
2660 stats->ngi_frames++;
2661
2662 stats->last_rates[stats->last_frame_idx] = rate;
2663 stats->last_frame_idx = (stats->last_frame_idx + 1) %
2664 ARRAY_SIZE(stats->last_rates);
2665
2666 spin_unlock(&mvm->drv_stats_lock);
2667}
2668#endif
2669
8ca151b5
JB		 2670/*
2671 * Called after adding a new station to initialize rate scaling
2672 */
2673void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
b87c2179 2674 enum ieee80211_band band, bool init)
8ca151b5
JB		 2675{
2676 int i, j;
2677 struct ieee80211_hw *hw = mvm->hw;
2678 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
d310e405 2679 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
9d8ce6af
JB		 2680 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2681 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
8ca151b5
JB		 2682 struct ieee80211_supported_band *sband;
2683 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2684
ae969afe
EP		 2685 /* clear all non-persistent lq data */
2686 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
b87c2179 2687
8ca151b5
JB		 2688 sband = hw->wiphy->bands[band];
2689
2690 lq_sta->lq.sta_id = sta_priv->sta_id;
2691
2692 for (j = 0; j < LQ_SIZE; j++)
b804eeb6 2693 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
8ca151b5
JB		 2694
2695 lq_sta->flush_timer = 0;
87d5e415 2696 lq_sta->last_tx = jiffies;
8ca151b5
JB		 2697
2698 IWL_DEBUG_RATE(mvm,
2699 "LQ: *** rate scale station global init for station %d ***\n",
2700 sta_priv->sta_id);
2701 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2702 * the lowest or the highest rate.. Could consider using RSSI from
2703 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2704 * after assoc.. */
2705
834437da 2706 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
8ca151b5
JB		 2707 lq_sta->band = sband->band;
2708 /*
2709 * active legacy rates as per supported rates bitmap
2710 */
2711 supp = sta->supp_rates[sband->band];
2712 lq_sta->active_legacy_rate = 0;
2713 for_each_set_bit(i, &supp, BITS_PER_LONG)
2714 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2715
d310e405 2716 /* TODO: should probably account for rx_highest for both HT/VHT */
2c59d80c
ES		 2717 if (!vht_cap || !vht_cap->vht_supported)
2718 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2719 else
2720 rs_vht_init(mvm, sta, lq_sta, vht_cap);
8ca151b5 2721
afe08e1c 2722 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
dc574e52
ES		 2723 lq_sta->active_mimo2_rate = 0;
2724
6a028d9a
ES		 2725 lq_sta->max_legacy_rate_idx =
2726 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2727 lq_sta->max_siso_rate_idx =
2728 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2729 lq_sta->max_mimo2_rate_idx =
2730 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
198266a3 2731
a3576ff2 2732 IWL_DEBUG_RATE(mvm,
be77c29c 2733 "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d\n",
198266a3 2734 lq_sta->active_legacy_rate,
8ca151b5 2735 lq_sta->active_siso_rate,
d310e405 2736 lq_sta->active_mimo2_rate,
d8bafeaf 2737 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc);
198266a3
ES		 2738 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2739 lq_sta->max_legacy_rate_idx,
2740 lq_sta->max_siso_rate_idx,
2741 lq_sta->max_mimo2_rate_idx);
8ca151b5
JB		 2742
2743 /* These values will be overridden later */
2744 lq_sta->lq.single_stream_ant_msk =
a0544272 2745 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
809bccfa 2746 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
8ca151b5
JB		 2747
2748 /* as default allow aggregation for all tids */
2749 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
8ca151b5 2750 lq_sta->is_agg = 0;
5fc0f76c
ES		 2751#ifdef CONFIG_IWLWIFI_DEBUGFS
2752 iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2753#endif
b87c2179
ES		 2754 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2755}
2756
2757static void rs_rate_update(void *mvm_r,
2758 struct ieee80211_supported_band *sband,
2759 struct cfg80211_chan_def *chandef,
2760 struct ieee80211_sta *sta, void *priv_sta,
2761 u32 changed)
2762{
2763 u8 tid;
2764 struct iwl_op_mode *op_mode =
2765 (struct iwl_op_mode *)mvm_r;
2766 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2767
2768 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2769 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2770 ieee80211_stop_tx_ba_session(sta, tid);
2771
2772 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
8ca151b5
JB		 2773}
2774
8fc7c58c
ES		 2775#ifdef CONFIG_MAC80211_DEBUGFS
2776static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2777 struct iwl_lq_cmd *lq_cmd,
2778 enum ieee80211_band band,
2779 u32 ucode_rate)
2780{
2781 struct rs_rate rate;
2782 int i;
2783 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2784 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
7ceb98a3 2785 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
8fc7c58c
ES		 2786
2787 for (i = 0; i < num_rates; i++)
2788 lq_cmd->rs_table[i] = ucode_rate_le32;
2789
2790 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2791
2792 if (is_mimo(&rate))
2793 lq_cmd->mimo_delim = num_rates - 1;
2794 else
2795 lq_cmd->mimo_delim = 0;
7ceb98a3
EG		 2796
2797 lq_cmd->reduced_tpc = 0;
2798
2799 if (num_of_ant(ant) == 1)
2800 lq_cmd->single_stream_ant_msk = ant;
2801
2802 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
8fc7c58c
ES		 2803}
2804#endif /* CONFIG_MAC80211_DEBUGFS */
2805
e07be6d3
ES		 2806static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2807 struct iwl_lq_sta *lq_sta,
2808 struct rs_rate *rate,
2809 __le32 *rs_table, int *rs_table_index,
2810 int num_rates, int num_retries,
2811 u8 valid_tx_ant, bool toggle_ant)
2812{
2813 int i, j;
2814 __le32 ucode_rate;
2815 bool bottom_reached = false;
2816 int prev_rate_idx = rate->index;
2817 int end = LINK_QUAL_MAX_RETRY_NUM;
2818 int index = *rs_table_index;
2819
2820 for (i = 0; i < num_rates && index < end; i++) {
bd999318
ES		 2821 for (j = 0; j < num_retries && index < end; j++, index++) {
2822 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2823 rate));
e07be6d3 2824 rs_table[index] = ucode_rate;
bd999318
ES		 2825 if (toggle_ant)
2826 rs_toggle_antenna(valid_tx_ant, rate);
2827 }
e07be6d3
ES		 2828
2829 prev_rate_idx = rate->index;
2830 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2831 if (bottom_reached && !is_legacy(rate))
2832 break;
2833 }
2834
bd999318 2835 if (!bottom_reached && !is_legacy(rate))
e07be6d3
ES		 2836 rate->index = prev_rate_idx;
2837
2838 *rs_table_index = index;
2839}
2840
2841/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2842 * column the rate table should look like this:
2843 *
2844 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2845 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2846 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2847 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2848 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2849 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2850 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2851 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2852 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2853 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2854 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2855 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2856 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2857 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2858 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2859 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2860 */
8fc7c58c 2861static void rs_build_rates_table(struct iwl_mvm *mvm,
d8bafeaf 2862 struct ieee80211_sta *sta,
8fc7c58c
ES		 2863 struct iwl_lq_sta *lq_sta,
2864 const struct rs_rate *initial_rate)
8ca151b5 2865{
5aa33553 2866 struct rs_rate rate;
e07be6d3 2867 int num_rates, num_retries, index = 0;
8ca151b5
JB		 2868 u8 valid_tx_ant = 0;
2869 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
e07be6d3 2870 bool toggle_ant = false;
c5d679a5 2871 bool stbc_allowed = false;
8ca151b5 2872
9e898f1b 2873 memcpy(&rate, initial_rate, sizeof(rate));
8fc7c58c 2874
a0544272 2875 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
c5d679a5
ES		 2876
2877 stbc_allowed = rs_stbc_allow(mvm, sta, lq_sta);
2878 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) {
2879 u32 ss_params = RS_SS_PARAMS_VALID;
2880
2881 if (stbc_allowed)
2882 ss_params |= RS_SS_STBC_ALLOWED;
2883 lq_cmd->ss_params = cpu_to_le32(ss_params);
2884 } else {
2885 /* TODO: remove old API when min FW API hits 14 */
2886 rate.stbc = stbc_allowed;
2887 }
8ca151b5 2888
e07be6d3 2889 if (is_siso(&rate)) {
834437da
ES		 2890 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2891 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
e07be6d3 2892 } else if (is_mimo(&rate)) {
834437da
ES		 2893 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2894 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
8ca151b5 2895 } else {
834437da 2896 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
bd999318 2897 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
e07be6d3 2898 toggle_ant = true;
8ca151b5
JB		 2899 }
2900
e07be6d3
ES		 2901 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2902 num_rates, num_retries, valid_tx_ant,
2903 toggle_ant);
8ca151b5 2904
e07be6d3 2905 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 2906
e07be6d3 2907 if (is_siso(&rate)) {
834437da
ES		 2908 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2909 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
d9088f60 2910 lq_cmd->mimo_delim = index;
e07be6d3 2911 } else if (is_legacy(&rate)) {
834437da 2912 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
bd999318 2913 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
e07be6d3
ES		 2914 } else {
2915 WARN_ON_ONCE(1);
2916 }
8ca151b5 2917
e07be6d3 2918 toggle_ant = true;
8ca151b5 2919
e07be6d3
ES		 2920 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2921 num_rates, num_retries, valid_tx_ant,
2922 toggle_ant);
8ca151b5 2923
e07be6d3 2924 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 2925
834437da 2926 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
bd999318 2927 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
8ca151b5 2928
e07be6d3
ES		 2929 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2930 num_rates, num_retries, valid_tx_ant,
2931 toggle_ant);
8ca151b5 2932
8fc7c58c
ES		 2933}
2934
2935static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2936 struct ieee80211_sta *sta,
2937 struct iwl_lq_sta *lq_sta,
2938 const struct rs_rate *initial_rate)
2939{
2940 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
7ceb98a3
EG		 2941 struct iwl_mvm_sta *mvmsta;
2942 struct iwl_mvm_vif *mvmvif;
2943
834437da 2944 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
7ceb98a3 2945 lq_cmd->agg_time_limit =
834437da 2946 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
8fc7c58c
ES		 2947
2948#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 2949 if (lq_sta->pers.dbg_fixed_rate) {
8fc7c58c
ES		 2950 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2951 lq_sta->band,
ae969afe 2952 lq_sta->pers.dbg_fixed_rate);
7ceb98a3
EG		 2953 return;
2954 }
8fc7c58c 2955#endif
7ceb98a3
EG		 2956 if (WARN_ON_ONCE(!sta || !initial_rate))
2957 return;
8fc7c58c 2958
d8bafeaf 2959 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
8ca151b5 2960
7ceb98a3
EG		 2961 if (num_of_ant(initial_rate->ant) == 1)
2962 lq_cmd->single_stream_ant_msk = initial_rate->ant;
8ca151b5 2963
7ceb98a3
EG		 2964 mvmsta = iwl_mvm_sta_from_mac80211(sta);
2965 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
e96d551f 2966
7ceb98a3
EG		 2967 if (num_of_ant(initial_rate->ant) == 1)
2968 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2969
2970 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
2971
2972 /*
2973 * In case of low latency, tell the firwmare to leave a frame in the
2974 * Tx Fifo so that it can start a transaction in the same TxOP. This
2975 * basically allows the firmware to send bursts.
2976 */
9ecd051e 2977 if (iwl_mvm_vif_low_latency(mvmvif)) {
7ceb98a3
EG		 2978 lq_cmd->agg_frame_cnt_limit--;
2979
9ecd051e
ES		 2980 if (mvm->low_latency_agg_frame_limit)
2981 lq_cmd->agg_frame_cnt_limit =
2982 min(lq_cmd->agg_frame_cnt_limit,
2983 mvm->low_latency_agg_frame_limit);
2984 }
2985
a4db848f
EG		 2986 if (mvmsta->vif->p2p)
2987 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
2988
7ceb98a3 2989 lq_cmd->agg_time_limit =
5b7ff615 2990 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
8ca151b5
JB		 2991}
2992
2993static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2994{
2995 return hw->priv;
2996}
2997/* rate scale requires free function to be implemented */
2998static void rs_free(void *mvm_rate)
2999{
3000 return;
3001}
3002
3003static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3004 void *mvm_sta)
3005{
3006 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3007 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3008
3009 IWL_DEBUG_RATE(mvm, "enter\n");
3010 IWL_DEBUG_RATE(mvm, "leave\n");
3011}
3012
3013#ifdef CONFIG_MAC80211_DEBUGFS
5fc0f76c 3014int rs_pretty_print_rate(char *buf, const u32 rate)
5aa33553
ES		 3015{
3016
1a61b347
ES		 3017 char *type, *bw;
3018 u8 mcs = 0, nss = 0;
3019 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3020
3021 if (!(rate & RATE_MCS_HT_MSK) &&
3022 !(rate & RATE_MCS_VHT_MSK)) {
3023 int index = iwl_hwrate_to_plcp_idx(rate);
3024
3025 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
560843f4
ES		 3026 rs_pretty_ant(ant),
3027 index == IWL_RATE_INVALID ? "BAD" :
3028 iwl_rate_mcs[index].mbps);
1a61b347
ES		 3029 }
3030
3031 if (rate & RATE_MCS_VHT_MSK) {
3032 type = "VHT";
3033 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3034 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3035 >> RATE_VHT_MCS_NSS_POS) + 1;
3036 } else if (rate & RATE_MCS_HT_MSK) {
3037 type = "HT";
3038 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3039 } else {
3040 type = "Unknown"; /* shouldn't happen */
3041 }
3042
3043 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3044 case RATE_MCS_CHAN_WIDTH_20:
3045 bw = "20Mhz";
3046 break;
3047 case RATE_MCS_CHAN_WIDTH_40:
3048 bw = "40Mhz";
3049 break;
3050 case RATE_MCS_CHAN_WIDTH_80:
3051 bw = "80Mhz";
3052 break;
3053 case RATE_MCS_CHAN_WIDTH_160:
3054 bw = "160Mhz";
3055 break;
3056 default:
3057 bw = "BAD BW";
3058 }
3059
3060 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
5aa33553 3061 type, rs_pretty_ant(ant), bw, mcs, nss,
1a61b347 3062 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
7b1dd048 3063 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
1a61b347
ES		 3064 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3065 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3066 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3067}
3068
a0c38b21
ES		 3069/**
3070 * Program the device to use fixed rate for frame transmit
3071 * This is for debugging/testing only
3072 * once the device start use fixed rate, we need to reload the module
3073 * to being back the normal operation.
3074 */
3075static void rs_program_fix_rate(struct iwl_mvm *mvm,
3076 struct iwl_lq_sta *lq_sta)
3077{
3078 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3079 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3080 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3081
3082 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
ae969afe 3083 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
a0c38b21 3084
ae969afe 3085 if (lq_sta->pers.dbg_fixed_rate) {
7ceb98a3 3086 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
ae969afe 3087 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
a0c38b21
ES		 3088 }
3089}
3090
9d10849e
EG		 3091static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3092 const char __user *user_buf, size_t count, loff_t *ppos)
3093{
3094 struct iwl_lq_sta *lq_sta = file->private_data;
3095 struct iwl_mvm *mvm;
3096 char buf[64];
3097 size_t buf_size;
3098 u32 parsed_rate;
3099
ae969afe 3100 mvm = lq_sta->pers.drv;
9d10849e
EG		 3101 memset(buf, 0, sizeof(buf));
3102 buf_size = min(count, sizeof(buf) - 1);
3103 if (copy_from_user(buf, user_buf, buf_size))
3104 return -EFAULT;
3105
3106 if (sscanf(buf, "%x", &parsed_rate) == 1)
ae969afe 3107 lq_sta->pers.dbg_fixed_rate = parsed_rate;
9d10849e 3108 else
ae969afe 3109 lq_sta->pers.dbg_fixed_rate = 0;
9d10849e
EG		 3110
3111 rs_program_fix_rate(mvm, lq_sta);
3112
3113 return count;
3114}
3115
8ca151b5
JB		 3116static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3117 char __user *user_buf, size_t count, loff_t *ppos)
3118{
3119 char *buff;
3120 int desc = 0;
3121 int i = 0;
8ca151b5
JB		 3122 ssize_t ret;
3123
3124 struct iwl_lq_sta *lq_sta = file->private_data;
3125 struct iwl_mvm *mvm;
3126 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 3127 struct rs_rate *rate = &tbl->rate;
ae969afe 3128 mvm = lq_sta->pers.drv;
1a61b347 3129 buff = kmalloc(2048, GFP_KERNEL);
8ca151b5
JB		 3130 if (!buff)
3131 return -ENOMEM;
3132
3133 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
198266a3 3134 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
8ca151b5
JB		 3135 lq_sta->total_failed, lq_sta->total_success,
3136 lq_sta->active_legacy_rate);
3137 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
ae969afe 3138 lq_sta->pers.dbg_fixed_rate);
8ca151b5 3139 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
a0544272
MH		 3140 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3141 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3142 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
8ca151b5 3143 desc += sprintf(buff+desc, "lq type %s\n",
5aa33553
ES		 3144 (is_legacy(rate)) ? "legacy" :
3145 is_vht(rate) ? "VHT" : "HT");
3146 if (!is_legacy(rate)) {
8ca151b5 3147 desc += sprintf(buff+desc, " %s",
5aa33553 3148 (is_siso(rate)) ? "SISO" : "MIMO2");
8ca151b5 3149 desc += sprintf(buff+desc, " %s",
5aa33553
ES		 3150 (is_ht20(rate)) ? "20MHz" :
3151 (is_ht40(rate)) ? "40MHz" :
3152 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
a3576ff2 3153 desc += sprintf(buff+desc, " %s %s %s\n",
5aa33553 3154 (rate->sgi) ? "SGI" : "NGI",
a3576ff2 3155 (rate->ldpc) ? "LDPC" : "BCC",
6a524f48 3156 (lq_sta->is_agg) ? "AGG on" : "");
8ca151b5
JB		 3157 }
3158 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3159 lq_sta->last_rate_n_flags);
3160 desc += sprintf(buff+desc,
1a61b347 3161 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
8ca151b5
JB		 3162 lq_sta->lq.flags,
3163 lq_sta->lq.mimo_delim,
3164 lq_sta->lq.single_stream_ant_msk,
3165 lq_sta->lq.dual_stream_ant_msk);
3166
3167 desc += sprintf(buff+desc,
3168 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3169 le16_to_cpu(lq_sta->lq.agg_time_limit),
3170 lq_sta->lq.agg_disable_start_th,
3171 lq_sta->lq.agg_frame_cnt_limit);
3172
2fd647f8 3173 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
8ca151b5
JB		 3174 desc += sprintf(buff+desc,
3175 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3176 lq_sta->lq.initial_rate_index[0],
3177 lq_sta->lq.initial_rate_index[1],
3178 lq_sta->lq.initial_rate_index[2],
3179 lq_sta->lq.initial_rate_index[3]);
3180
3181 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
cf4ef654 3182 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
1a61b347 3183
cf4ef654
JB		 3184 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3185 desc += rs_pretty_print_rate(buff+desc, r);
8ca151b5
JB		 3186 }
3187
3188 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3189 kfree(buff);
3190 return ret;
3191}
3192
3193static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3194 .write = rs_sta_dbgfs_scale_table_write,
3195 .read = rs_sta_dbgfs_scale_table_read,
3196 .open = simple_open,
3197 .llseek = default_llseek,
3198};
3199static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3200 char __user *user_buf, size_t count, loff_t *ppos)
3201{
3202 char *buff;
3203 int desc = 0;
3204 int i, j;
3205 ssize_t ret;
d310e405 3206 struct iwl_scale_tbl_info *tbl;
5aa33553 3207 struct rs_rate *rate;
8ca151b5
JB		 3208 struct iwl_lq_sta *lq_sta = file->private_data;
3209
3210 buff = kmalloc(1024, GFP_KERNEL);
3211 if (!buff)
3212 return -ENOMEM;
3213
3214 for (i = 0; i < LQ_SIZE; i++) {
d310e405 3215 tbl = &(lq_sta->lq_info[i]);
5aa33553 3216 rate = &tbl->rate;
8ca151b5 3217 desc += sprintf(buff+desc,
6a524f48 3218 "%s type=%d SGI=%d BW=%s DUP=0\n"
8fc7c58c 3219 "index=%d\n",
8ca151b5 3220 lq_sta->active_tbl == i ? "*" : "x",
5aa33553
ES		 3221 rate->type,
3222 rate->sgi,
3223 is_ht20(rate) ? "20Mhz" :
3224 is_ht40(rate) ? "40Mhz" :
3225 is_ht80(rate) ? "80Mhz" : "ERR",
8fc7c58c 3226 rate->index);
8ca151b5
JB		 3227 for (j = 0; j < IWL_RATE_COUNT; j++) {
3228 desc += sprintf(buff+desc,
3229 "counter=%d success=%d %%=%d\n",
d310e405
ES		 3230 tbl->win[j].counter,
3231 tbl->win[j].success_counter,
3232 tbl->win[j].success_ratio);
8ca151b5
JB		 3233 }
3234 }
3235 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3236 kfree(buff);
3237 return ret;
3238}
3239
3240static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3241 .read = rs_sta_dbgfs_stats_table_read,
3242 .open = simple_open,
3243 .llseek = default_llseek,
3244};
3245
757cf23b
ES		 3246static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3247 char __user *user_buf,
3248 size_t count, loff_t *ppos)
3249{
3250 static const char * const column_name[] = {
3251 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3252 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3253 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3254 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3255 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3256 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3257 [RS_COLUMN_MIMO2] = "MIMO2",
3258 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3259 };
3260
3261 static const char * const rate_name[] = {
3262 [IWL_RATE_1M_INDEX] = "1M",
3263 [IWL_RATE_2M_INDEX] = "2M",
3264 [IWL_RATE_5M_INDEX] = "5.5M",
3265 [IWL_RATE_11M_INDEX] = "11M",
3266 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3267 [IWL_RATE_9M_INDEX] = "9M",
3268 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3269 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3270 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3271 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3272 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3273 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3274 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3275 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3276 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3277 };
3278
3279 char *buff, *pos, *endpos;
3280 int col, rate;
3281 ssize_t ret;
3282 struct iwl_lq_sta *lq_sta = file->private_data;
3283 struct rs_rate_stats *stats;
3284 static const size_t bufsz = 1024;
3285
3286 buff = kmalloc(bufsz, GFP_KERNEL);
3287 if (!buff)
3288 return -ENOMEM;
3289
3290 pos = buff;
3291 endpos = pos + bufsz;
3292
3293 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3294 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3295 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3296 pos += scnprintf(pos, endpos - pos, "\n");
3297
3298 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3299 pos += scnprintf(pos, endpos - pos,
3300 "%s,", column_name[col]);
3301
3302 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
f58220f6 3303 stats = &(lq_sta->pers.tx_stats[col][rate]);
757cf23b
ES		 3304 pos += scnprintf(pos, endpos - pos,
3305 "%llu/%llu,",
3306 stats->success,
3307 stats->total);
3308 }
3309 pos += scnprintf(pos, endpos - pos, "\n");
3310 }
3311
3312 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3313 kfree(buff);
3314 return ret;
3315}
3316
3317static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3318 const char __user *user_buf,
3319 size_t count, loff_t *ppos)
3320{
3321 struct iwl_lq_sta *lq_sta = file->private_data;
f58220f6 3322 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
757cf23b
ES		 3323
3324 return count;
3325}
3326
3327static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3328 .read = rs_sta_dbgfs_drv_tx_stats_read,
3329 .write = rs_sta_dbgfs_drv_tx_stats_write,
3330 .open = simple_open,
3331 .llseek = default_llseek,
3332};
3333
8ca151b5
JB		 3334static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3335{
3336 struct iwl_lq_sta *lq_sta = mvm_sta;
c6e1faad
EP		 3337 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3338 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3339 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3340 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3341 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3342 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3343 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3344 &lq_sta->tx_agg_tid_en);
3345 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3346 &lq_sta->pers.dbg_fixed_txp_reduction);
8ca151b5
JB		 3347}
3348
3349static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3350{
8ca151b5
JB		 3351}
3352#endif
3353
3354/*
3355 * Initialization of rate scaling information is done by driver after
3356 * the station is added. Since mac80211 calls this function before a
3357 * station is added we ignore it.
3358 */
3359static void rs_rate_init_stub(void *mvm_r,
3de805cf
SW		 3360 struct ieee80211_supported_band *sband,
3361 struct cfg80211_chan_def *chandef,
3362 struct ieee80211_sta *sta, void *mvm_sta)
8ca151b5
JB		 3363{
3364}
631ad703
JB		 3365
3366static const struct rate_control_ops rs_mvm_ops = {
8ca151b5 3367 .name = RS_NAME,
1ebc8f2e 3368 .tx_status = rs_mac80211_tx_status,
8ca151b5
JB		 3369 .get_rate = rs_get_rate,
3370 .rate_init = rs_rate_init_stub,
3371 .alloc = rs_alloc,
3372 .free = rs_free,
3373 .alloc_sta = rs_alloc_sta,
3374 .free_sta = rs_free_sta,
b87c2179 3375 .rate_update = rs_rate_update,
8ca151b5
JB		 3376#ifdef CONFIG_MAC80211_DEBUGFS
3377 .add_sta_debugfs = rs_add_debugfs,
3378 .remove_sta_debugfs = rs_remove_debugfs,
3379#endif
3380};
3381
3382int iwl_mvm_rate_control_register(void)
3383{
3384 return ieee80211_rate_control_register(&rs_mvm_ops);
3385}
3386
3387void iwl_mvm_rate_control_unregister(void)
3388{
3389 ieee80211_rate_control_unregister(&rs_mvm_ops);
3390}
9ee718aa
EL		 3391
3392/**
3393 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3394 * Tx protection, according to this rquest and previous requests,
3395 * and send the LQ command.
9ee718aa
EL		 3396 * @mvmsta: The station
3397 * @enable: Enable Tx protection?
3398 */
e126b5d9
JB		 3399int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3400 bool enable)
9ee718aa 3401{
e126b5d9
JB		 3402 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3403
9ee718aa
EL		 3404 lockdep_assert_held(&mvm->mutex);
3405
3406 if (enable) {
3407 if (mvmsta->tx_protection == 0)
d307ec8d 3408 lq->flags |= LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 3409 mvmsta->tx_protection++;
3410 } else {
3411 mvmsta->tx_protection--;
3412 if (mvmsta->tx_protection == 0)
d307ec8d 3413 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 3414 }
3415
9e680946 3416 return iwl_mvm_send_lq_cmd(mvm, lq, false);
9ee718aa 3417}
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