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iwlwifi: mvm: rs: better match tx response rate to the LQ table
[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"
1e9c62fa 42#include "debugfs.h"
8ca151b5
JB		 43
44#define RS_NAME "iwl-mvm-rs"
45
8ca151b5 46#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
8ca151b5 47
834437da
ES		 48/* Calculations of success ratio are done in fixed point where 12800 is 100%.
49 * Use this macro when dealing with thresholds consts set as a percentage
50 */
51#define RS_PERCENT(x) (128 * x)
8ca151b5
JB		 52
53static u8 rs_ht_to_legacy[] = {
da87d7d5
ES		 54 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
55 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
56 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
57 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
58 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
59 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
60 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
61 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
8ca151b5
JB		 64};
65
66static const u8 ant_toggle_lookup[] = {
ef4394b9
EP		 67 [ANT_NONE] = ANT_NONE,
68 [ANT_A] = ANT_B,
69 [ANT_B] = ANT_C,
70 [ANT_AB] = ANT_BC,
71 [ANT_C] = ANT_A,
72 [ANT_AC] = ANT_AB,
73 [ANT_BC] = ANT_AC,
74 [ANT_ABC] = ANT_ABC,
8ca151b5
JB		 75};
76
d310e405
ES		 77#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
83 IWL_RATE_##rp##M_INDEX, \
ab055ce9 84 IWL_RATE_##rn##M_INDEX }
8ca151b5 85
d310e405
ES		 86#define IWL_DECLARE_MCS_RATE(s) \
87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_INVM_INDEX, \
93 IWL_RATE_INVM_INDEX }
94
8ca151b5
JB		 95/*
96 * Parameter order:
ab055ce9 97 * rate, ht rate, prev rate, next rate
8ca151b5
JB		 98 *
99 * If there isn't a valid next or previous rate then INV is used which
100 * maps to IWL_RATE_INVALID
101 *
102 */
103static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
ab055ce9
ES		 104 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
105 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
106 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
107 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
d310e405
ES		 108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
109 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
8ca151b5
JB		 119};
120
4e4b815c
ES		 121enum rs_action {
122 RS_ACTION_STAY = 0,
123 RS_ACTION_DOWNSCALE = -1,
124 RS_ACTION_UPSCALE = 1,
125};
126
b3b06a32
ES		 127enum rs_column_mode {
128 RS_INVALID = 0,
129 RS_LEGACY,
130 RS_SISO,
131 RS_MIMO2,
132};
133
fd7dbee5 134#define MAX_NEXT_COLUMNS 7
b3b06a32
ES		 135#define MAX_COLUMN_CHECKS 3
136
137typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
138 struct ieee80211_sta *sta,
139 struct iwl_scale_tbl_info *tbl);
140
141struct rs_tx_column {
142 enum rs_column_mode mode;
143 u8 ant;
144 bool sgi;
145 enum rs_column next_columns[MAX_NEXT_COLUMNS];
146 allow_column_func_t checks[MAX_COLUMN_CHECKS];
147};
148
219fb66b
EG		 149static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
150 struct iwl_scale_tbl_info *tbl)
151{
152 return iwl_mvm_bt_coex_is_ant_avail(mvm, tbl->rate.ant);
153}
154
b3b06a32
ES		 155static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
156 struct iwl_scale_tbl_info *tbl)
157{
158 if (!sta->ht_cap.ht_supported)
159 return false;
160
161 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
162 return false;
163
a0544272 164 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
b3b06a32
ES		 165 return false;
166
167 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
168 return false;
169
170 return true;
171}
172
173static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
174 struct iwl_scale_tbl_info *tbl)
175{
176 if (!sta->ht_cap.ht_supported)
177 return false;
178
179 return true;
180}
181
182static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
183 struct iwl_scale_tbl_info *tbl)
184{
185 struct rs_rate *rate = &tbl->rate;
186 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
187 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
188
189 if (is_ht20(rate) && (ht_cap->cap &
190 IEEE80211_HT_CAP_SGI_20))
191 return true;
192 if (is_ht40(rate) && (ht_cap->cap &
193 IEEE80211_HT_CAP_SGI_40))
194 return true;
195 if (is_ht80(rate) && (vht_cap->cap &
196 IEEE80211_VHT_CAP_SHORT_GI_80))
197 return true;
198
199 return false;
200}
201
202static const struct rs_tx_column rs_tx_columns[] = {
203 [RS_COLUMN_LEGACY_ANT_A] = {
204 .mode = RS_LEGACY,
205 .ant = ANT_A,
206 .next_columns = {
207 RS_COLUMN_LEGACY_ANT_B,
208 RS_COLUMN_SISO_ANT_A,
31b20452 209 RS_COLUMN_MIMO2,
d8fff919
ES		 210 RS_COLUMN_INVALID,
211 RS_COLUMN_INVALID,
fd7dbee5
ES		 212 RS_COLUMN_INVALID,
213 RS_COLUMN_INVALID,
b3b06a32 214 },
219fb66b
EG		 215 .checks = {
216 rs_ant_allow,
217 },
b3b06a32
ES		 218 },
219 [RS_COLUMN_LEGACY_ANT_B] = {
220 .mode = RS_LEGACY,
221 .ant = ANT_B,
222 .next_columns = {
223 RS_COLUMN_LEGACY_ANT_A,
224 RS_COLUMN_SISO_ANT_B,
31b20452 225 RS_COLUMN_MIMO2,
d8fff919
ES		 226 RS_COLUMN_INVALID,
227 RS_COLUMN_INVALID,
fd7dbee5
ES		 228 RS_COLUMN_INVALID,
229 RS_COLUMN_INVALID,
b3b06a32 230 },
219fb66b
EG		 231 .checks = {
232 rs_ant_allow,
233 },
b3b06a32
ES		 234 },
235 [RS_COLUMN_SISO_ANT_A] = {
236 .mode = RS_SISO,
237 .ant = ANT_A,
238 .next_columns = {
239 RS_COLUMN_SISO_ANT_B,
240 RS_COLUMN_MIMO2,
241 RS_COLUMN_SISO_ANT_A_SGI,
fd7dbee5
ES		 242 RS_COLUMN_LEGACY_ANT_A,
243 RS_COLUMN_LEGACY_ANT_B,
d8fff919 244 RS_COLUMN_INVALID,
31b20452 245 RS_COLUMN_INVALID,
b3b06a32
ES		 246 },
247 .checks = {
248 rs_siso_allow,
219fb66b 249 rs_ant_allow,
b3b06a32
ES		 250 },
251 },
252 [RS_COLUMN_SISO_ANT_B] = {
253 .mode = RS_SISO,
254 .ant = ANT_B,
255 .next_columns = {
256 RS_COLUMN_SISO_ANT_A,
257 RS_COLUMN_MIMO2,
258 RS_COLUMN_SISO_ANT_B_SGI,
fd7dbee5
ES		 259 RS_COLUMN_LEGACY_ANT_A,
260 RS_COLUMN_LEGACY_ANT_B,
d8fff919 261 RS_COLUMN_INVALID,
31b20452 262 RS_COLUMN_INVALID,
b3b06a32
ES		 263 },
264 .checks = {
265 rs_siso_allow,
219fb66b 266 rs_ant_allow,
b3b06a32
ES		 267 },
268 },
269 [RS_COLUMN_SISO_ANT_A_SGI] = {
270 .mode = RS_SISO,
271 .ant = ANT_A,
272 .sgi = true,
273 .next_columns = {
274 RS_COLUMN_SISO_ANT_B_SGI,
275 RS_COLUMN_MIMO2_SGI,
276 RS_COLUMN_SISO_ANT_A,
fd7dbee5
ES		 277 RS_COLUMN_LEGACY_ANT_A,
278 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 279 RS_COLUMN_INVALID,
280 RS_COLUMN_INVALID,
b3b06a32
ES		 281 },
282 .checks = {
283 rs_siso_allow,
219fb66b 284 rs_ant_allow,
b3b06a32
ES		 285 rs_sgi_allow,
286 },
287 },
288 [RS_COLUMN_SISO_ANT_B_SGI] = {
289 .mode = RS_SISO,
290 .ant = ANT_B,
291 .sgi = true,
292 .next_columns = {
293 RS_COLUMN_SISO_ANT_A_SGI,
294 RS_COLUMN_MIMO2_SGI,
295 RS_COLUMN_SISO_ANT_B,
fd7dbee5
ES		 296 RS_COLUMN_LEGACY_ANT_A,
297 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 298 RS_COLUMN_INVALID,
299 RS_COLUMN_INVALID,
b3b06a32
ES		 300 },
301 .checks = {
302 rs_siso_allow,
219fb66b 303 rs_ant_allow,
b3b06a32
ES		 304 rs_sgi_allow,
305 },
306 },
307 [RS_COLUMN_MIMO2] = {
308 .mode = RS_MIMO2,
309 .ant = ANT_AB,
310 .next_columns = {
311 RS_COLUMN_SISO_ANT_A,
312 RS_COLUMN_MIMO2_SGI,
fd7dbee5
ES		 313 RS_COLUMN_LEGACY_ANT_A,
314 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 315 RS_COLUMN_INVALID,
316 RS_COLUMN_INVALID,
317 RS_COLUMN_INVALID,
b3b06a32
ES		 318 },
319 .checks = {
320 rs_mimo_allow,
321 },
322 },
323 [RS_COLUMN_MIMO2_SGI] = {
324 .mode = RS_MIMO2,
325 .ant = ANT_AB,
326 .sgi = true,
327 .next_columns = {
328 RS_COLUMN_SISO_ANT_A_SGI,
329 RS_COLUMN_MIMO2,
fd7dbee5
ES		 330 RS_COLUMN_LEGACY_ANT_A,
331 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 332 RS_COLUMN_INVALID,
333 RS_COLUMN_INVALID,
334 RS_COLUMN_INVALID,
b3b06a32
ES		 335 },
336 .checks = {
337 rs_mimo_allow,
338 rs_sgi_allow,
339 },
340 },
341};
342
8ca151b5
JB		 343static inline u8 rs_extract_rate(u32 rate_n_flags)
344{
345 /* also works for HT because bits 7:6 are zero there */
346 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
347}
348
349static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
350{
351 int idx = 0;
352
8ca151b5 353 if (rate_n_flags & RATE_MCS_HT_MSK) {
d310e405
ES		 354 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
355 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 356
d310e405 357 /* skip 9M not supported in HT*/
8ca151b5
JB		 358 if (idx >= IWL_RATE_9M_INDEX)
359 idx += 1;
4e82dd3a 360 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
8ca151b5 361 return idx;
d310e405
ES		 362 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
363 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
364 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 365
d310e405
ES		 366 /* skip 9M not supported in VHT*/
367 if (idx >= IWL_RATE_9M_INDEX)
368 idx++;
369 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
370 return idx;
8ca151b5 371 } else {
d310e405
ES		 372 /* legacy rate format, search for match in table */
373
374 u8 legacy_rate = rs_extract_rate(rate_n_flags);
8ca151b5 375 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
d310e405 376 if (iwl_rates[idx].plcp == legacy_rate)
8ca151b5
JB		 377 return idx;
378 }
379
560843f4 380 return IWL_RATE_INVALID;
8ca151b5
JB		 381}
382
383static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1ebc8f2e
ES		 384 struct ieee80211_sta *sta,
385 struct iwl_lq_sta *lq_sta,
386 int tid);
8fc7c58c
ES		 387static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
388 struct ieee80211_sta *sta,
389 struct iwl_lq_sta *lq_sta,
390 const struct rs_rate *initial_rate);
8ca151b5 391static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
8ca151b5 392
8ca151b5
JB		 393/**
394 * The following tables contain the expected throughput metrics for all rates
395 *
396 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
397 *
398 * where invalid entries are zeros.
399 *
400 * CCK rates are only valid in legacy table and will only be used in G
401 * (2.4 GHz) band.
402 */
403
a34529e8 404static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
4e82dd3a 405 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
8ca151b5
JB		 406};
407
4e82dd3a
ES		 408/* Expected TpT tables. 4 indexes:
409 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
410 */
a34529e8 411static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 412 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
413 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
414 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
415 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
8ca151b5
JB		 416};
417
a34529e8 418static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 419 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
420 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
421 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
422 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
8ca151b5
JB		 423};
424
a34529e8 425static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 426 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
427 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
428 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
429 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
430};
431
a34529e8 432static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 433 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
434 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
435 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
436 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
8ca151b5
JB		 437};
438
a34529e8 439static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 440 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
441 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
442 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
443 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
8ca151b5
JB		 444};
445
a34529e8 446static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 447 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
448 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
449 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
450 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
451};
452
8ca151b5
JB		 453/* mbps, mcs */
454static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
455 { "1", "BPSK DSSS"},
456 { "2", "QPSK DSSS"},
457 {"5.5", "BPSK CCK"},
458 { "11", "QPSK CCK"},
459 { "6", "BPSK 1/2"},
460 { "9", "BPSK 1/2"},
461 { "12", "QPSK 1/2"},
462 { "18", "QPSK 3/4"},
463 { "24", "16QAM 1/2"},
464 { "36", "16QAM 3/4"},
465 { "48", "64QAM 2/3"},
466 { "54", "64QAM 3/4"},
467 { "60", "64QAM 5/6"},
468};
469
470#define MCS_INDEX_PER_STREAM (8)
471
9d10849e
EG		 472static const char *rs_pretty_ant(u8 ant)
473{
474 static const char * const ant_name[] = {
475 [ANT_NONE] = "None",
476 [ANT_A] = "A",
477 [ANT_B] = "B",
478 [ANT_AB] = "AB",
479 [ANT_C] = "C",
480 [ANT_AC] = "AC",
481 [ANT_BC] = "BC",
482 [ANT_ABC] = "ABC",
483 };
484
485 if (ant > ANT_ABC)
486 return "UNKNOWN";
487
488 return ant_name[ant];
489}
490
491static const char *rs_pretty_lq_type(enum iwl_table_type type)
492{
493 static const char * const lq_types[] = {
494 [LQ_NONE] = "NONE",
495 [LQ_LEGACY_A] = "LEGACY_A",
496 [LQ_LEGACY_G] = "LEGACY_G",
497 [LQ_HT_SISO] = "HT SISO",
498 [LQ_HT_MIMO2] = "HT MIMO",
499 [LQ_VHT_SISO] = "VHT SISO",
500 [LQ_VHT_MIMO2] = "VHT MIMO",
501 };
502
503 if (type < LQ_NONE || type >= LQ_MAX)
504 return "UNKNOWN";
505
506 return lq_types[type];
507}
508
5aa33553
ES		 509static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
510 const char *prefix)
511{
d8bafeaf 512 IWL_DEBUG_RATE(mvm,
26a2cc01 513 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
5aa33553
ES		 514 prefix, rs_pretty_lq_type(rate->type),
515 rate->index, rs_pretty_ant(rate->ant),
d8bafeaf 516 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
5aa33553
ES		 517}
518
8ca151b5
JB		 519static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
520{
521 window->data = 0;
522 window->success_counter = 0;
523 window->success_ratio = IWL_INVALID_VALUE;
524 window->counter = 0;
525 window->average_tpt = IWL_INVALID_VALUE;
8ca151b5
JB		 526}
527
b804eeb6
ES		 528static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
529 struct iwl_scale_tbl_info *tbl)
3ca71f60
EP		 530{
531 int i;
532
b804eeb6 533 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
3ca71f60
EP		 534 for (i = 0; i < IWL_RATE_COUNT; i++)
535 rs_rate_scale_clear_window(&tbl->win[i]);
2fd647f8
EP		 536
537 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
538 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
3ca71f60
EP		 539}
540
8ca151b5
JB		 541static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
542{
543 return (ant_type & valid_antenna) == ant_type;
544}
545
8ca151b5
JB		 546static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
547 struct iwl_lq_sta *lq_data, u8 tid,
548 struct ieee80211_sta *sta)
549{
550 int ret = -EAGAIN;
8ca151b5 551
44cc429c
EG		 552 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
553 sta->addr, tid);
554 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
555 if (ret == -EAGAIN) {
556 /*
557 * driver and mac80211 is out of sync
558 * this might be cause by reloading firmware
559 * stop the tx ba session here
560 */
561 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
562 tid);
563 ieee80211_stop_tx_ba_session(sta, tid);
8ca151b5
JB		 564 }
565 return ret;
566}
567
568static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
569 struct iwl_lq_sta *lq_data,
570 struct ieee80211_sta *sta)
571{
572 if (tid < IWL_MAX_TID_COUNT)
573 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
574 else
575 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
576 tid, IWL_MAX_TID_COUNT);
577}
578
579static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
580{
581 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
582 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
583 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
584}
585
586/*
587 * Static function to get the expected throughput from an iwl_scale_tbl_info
588 * that wraps a NULL pointer check
589 */
590static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
591{
592 if (tbl->expected_tpt)
593 return tbl->expected_tpt[rs_index];
594 return 0;
595}
596
597/**
598 * rs_collect_tx_data - Update the success/failure sliding window
599 *
600 * We keep a sliding window of the last 62 packets transmitted
601 * at this rate. window->data contains the bitmask of successful
602 * packets.
603 */
834437da
ES		 604static int _rs_collect_tx_data(struct iwl_mvm *mvm,
605 struct iwl_scale_tbl_info *tbl,
0bd3c5a7
EP		 606 int scale_index, int attempts, int successes,
607 struct iwl_rate_scale_data *window)
8ca151b5 608{
8ca151b5
JB		 609 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
610 s32 fail_count, tpt;
611
8ca151b5
JB		 612 /* Get expected throughput */
613 tpt = get_expected_tpt(tbl, scale_index);
614
615 /*
616 * Keep track of only the latest 62 tx frame attempts in this rate's
617 * history window; anything older isn't really relevant any more.
618 * If we have filled up the sliding window, drop the oldest attempt;
619 * if the oldest attempt (highest bit in bitmap) shows "success",
620 * subtract "1" from the success counter (this is the main reason
621 * we keep these bitmaps!).
622 */
623 while (attempts > 0) {
624 if (window->counter >= IWL_RATE_MAX_WINDOW) {
625 /* remove earliest */
626 window->counter = IWL_RATE_MAX_WINDOW - 1;
627
628 if (window->data & mask) {
629 window->data &= ~mask;
630 window->success_counter--;
631 }
632 }
633
634 /* Increment frames-attempted counter */
635 window->counter++;
636
637 /* Shift bitmap by one frame to throw away oldest history */
638 window->data <<= 1;
639
640 /* Mark the most recent #successes attempts as successful */
641 if (successes > 0) {
642 window->success_counter++;
643 window->data |= 0x1;
644 successes--;
645 }
646
647 attempts--;
648 }
649
650 /* Calculate current success ratio, avoid divide-by-0! */
651 if (window->counter > 0)
652 window->success_ratio = 128 * (100 * window->success_counter)
653 / window->counter;
654 else
655 window->success_ratio = IWL_INVALID_VALUE;
656
657 fail_count = window->counter - window->success_counter;
658
659 /* Calculate average throughput, if we have enough history. */
834437da
ES		 660 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
661 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
8ca151b5
JB		 662 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
663 else
664 window->average_tpt = IWL_INVALID_VALUE;
665
8ca151b5
JB		 666 return 0;
667}
668
834437da
ES		 669static int rs_collect_tx_data(struct iwl_mvm *mvm,
670 struct iwl_lq_sta *lq_sta,
757cf23b 671 struct iwl_scale_tbl_info *tbl,
2fd647f8
EP		 672 int scale_index, int attempts, int successes,
673 u8 reduced_txp)
0bd3c5a7
EP		 674{
675 struct iwl_rate_scale_data *window = NULL;
2fd647f8 676 int ret;
0bd3c5a7
EP		 677
678 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
679 return -EINVAL;
680
757cf23b 681 if (tbl->column != RS_COLUMN_INVALID) {
f58220f6
ES		 682 struct lq_sta_pers *pers = &lq_sta->pers;
683
684 pers->tx_stats[tbl->column][scale_index].total += attempts;
685 pers->tx_stats[tbl->column][scale_index].success += successes;
757cf23b
ES		 686 }
687
0bd3c5a7
EP		 688 /* Select window for current tx bit rate */
689 window = &(tbl->win[scale_index]);
690
834437da 691 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
2fd647f8
EP		 692 window);
693 if (ret)
694 return ret;
695
696 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
697 return -EINVAL;
698
699 window = &tbl->tpc_win[reduced_txp];
834437da 700 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
0bd3c5a7
EP		 701 window);
702}
703
5aa33553
ES		 704/* Convert rs_rate object into ucode rate bitmask */
705static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
8fc7c58c 706 struct rs_rate *rate)
8ca151b5 707{
5aa33553
ES		 708 u32 ucode_rate = 0;
709 int index = rate->index;
8ca151b5 710
5aa33553 711 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
d310e405
ES		 712 RATE_MCS_ANT_ABC_MSK);
713
5aa33553
ES		 714 if (is_legacy(rate)) {
715 ucode_rate |= iwl_rates[index].plcp;
8ca151b5 716 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
5aa33553
ES		 717 ucode_rate |= RATE_MCS_CCK_MSK;
718 return ucode_rate;
d310e405
ES		 719 }
720
5aa33553 721 if (is_ht(rate)) {
d310e405 722 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
8ca151b5 723 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
4e82dd3a 724 index = IWL_LAST_HT_RATE;
8ca151b5 725 }
5aa33553 726 ucode_rate |= RATE_MCS_HT_MSK;
8ca151b5 727
5aa33553
ES		 728 if (is_ht_siso(rate))
729 ucode_rate |= iwl_rates[index].plcp_ht_siso;
730 else if (is_ht_mimo2(rate))
731 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
8ca151b5 732 else
d972ab31 733 WARN_ON_ONCE(1);
5aa33553 734 } else if (is_vht(rate)) {
d310e405
ES		 735 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
736 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
737 index = IWL_LAST_VHT_RATE;
738 }
5aa33553
ES		 739 ucode_rate |= RATE_MCS_VHT_MSK;
740 if (is_vht_siso(rate))
741 ucode_rate |= iwl_rates[index].plcp_vht_siso;
742 else if (is_vht_mimo2(rate))
743 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
d310e405
ES		 744 else
745 WARN_ON_ONCE(1);
746
8ca151b5 747 } else {
5aa33553 748 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
8ca151b5
JB		 749 }
750
d8bafeaf
ES		 751 if (is_siso(rate) && rate->stbc) {
752 /* To enable STBC we need to set both a flag and ANT_AB */
753 ucode_rate |= RATE_MCS_ANT_AB_MSK;
754 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
755 }
756
5aa33553
ES		 757 ucode_rate |= rate->bw;
758 if (rate->sgi)
759 ucode_rate |= RATE_MCS_SGI_MSK;
a3576ff2
ES		 760 if (rate->ldpc)
761 ucode_rate |= RATE_MCS_LDPC_MSK;
d310e405 762
5aa33553 763 return ucode_rate;
8ca151b5
JB		 764}
765
5aa33553
ES		 766/* Convert a ucode rate into an rs_rate object */
767static int rs_rate_from_ucode_rate(const u32 ucode_rate,
768 enum ieee80211_band band,
769 struct rs_rate *rate)
8ca151b5 770{
5aa33553
ES		 771 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
772 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
d310e405 773 u8 nss;
8ca151b5 774
9e898f1b 775 memset(rate, 0, sizeof(*rate));
5aa33553 776 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
8ca151b5 777
560843f4 778 if (rate->index == IWL_RATE_INVALID)
8ca151b5 779 return -EINVAL;
5aa33553
ES		 780
781 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
8ca151b5 782
d310e405 783 /* Legacy */
5aa33553
ES		 784 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
785 !(ucode_rate & RATE_MCS_VHT_MSK)) {
8ca151b5
JB		 786 if (num_of_ant == 1) {
787 if (band == IEEE80211_BAND_5GHZ)
5aa33553 788 rate->type = LQ_LEGACY_A;
8ca151b5 789 else
5aa33553 790 rate->type = LQ_LEGACY_G;
8ca151b5 791 }
d310e405
ES		 792
793 return 0;
794 }
795
796 /* HT or VHT */
5aa33553
ES		 797 if (ucode_rate & RATE_MCS_SGI_MSK)
798 rate->sgi = true;
a3576ff2
ES		 799 if (ucode_rate & RATE_MCS_LDPC_MSK)
800 rate->ldpc = true;
d8bafeaf
ES		 801 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
802 rate->stbc = true;
d310e405 803
5aa33553 804 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
d310e405 805
5aa33553
ES		 806 if (ucode_rate & RATE_MCS_HT_MSK) {
807 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
d310e405
ES		 808 RATE_HT_MCS_NSS_POS) + 1;
809
810 if (nss == 1) {
5aa33553 811 rate->type = LQ_HT_SISO;
d8bafeaf 812 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
d310e405 813 } else if (nss == 2) {
5aa33553 814 rate->type = LQ_HT_MIMO2;
d310e405 815 WARN_ON_ONCE(num_of_ant != 2);
8ca151b5 816 } else {
d310e405
ES		 817 WARN_ON_ONCE(1);
818 }
5aa33553
ES		 819 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
820 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
d310e405
ES		 821 RATE_VHT_MCS_NSS_POS) + 1;
822
823 if (nss == 1) {
5aa33553 824 rate->type = LQ_VHT_SISO;
1507fb75 825 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
d310e405 826 } else if (nss == 2) {
5aa33553 827 rate->type = LQ_VHT_MIMO2;
d310e405
ES		 828 WARN_ON_ONCE(num_of_ant != 2);
829 } else {
830 WARN_ON_ONCE(1);
8ca151b5
JB		 831 }
832 }
d310e405 833
5aa33553
ES		 834 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
835 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
836 !is_vht(rate));
d310e405 837
8ca151b5
JB		 838 return 0;
839}
840
841/* switch to another antenna/antennas and return 1 */
842/* if no other valid antenna found, return 0 */
8fc7c58c 843static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
8ca151b5
JB		 844{
845 u8 new_ant_type;
846
5aa33553 847 if (!rate->ant || rate->ant > ANT_ABC)
8ca151b5
JB		 848 return 0;
849
5aa33553 850 if (!rs_is_valid_ant(valid_ant, rate->ant))
8ca151b5
JB		 851 return 0;
852
5aa33553 853 new_ant_type = ant_toggle_lookup[rate->ant];
8ca151b5 854
5aa33553 855 while ((new_ant_type != rate->ant) &&
8ca151b5
JB		 856 !rs_is_valid_ant(valid_ant, new_ant_type))
857 new_ant_type = ant_toggle_lookup[new_ant_type];
858
5aa33553 859 if (new_ant_type == rate->ant)
8ca151b5
JB		 860 return 0;
861
5aa33553
ES		 862 rate->ant = new_ant_type;
863
8ca151b5
JB		 864 return 1;
865}
866
8ca151b5 867static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
5aa33553 868 struct rs_rate *rate)
8ca151b5 869{
5aa33553 870 if (is_legacy(rate))
8ca151b5 871 return lq_sta->active_legacy_rate;
5aa33553 872 else if (is_siso(rate))
d310e405 873 return lq_sta->active_siso_rate;
5aa33553 874 else if (is_mimo2(rate))
d310e405
ES		 875 return lq_sta->active_mimo2_rate;
876
877 WARN_ON_ONCE(1);
878 return 0;
8ca151b5
JB		 879}
880
881static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
882 int rate_type)
883{
884 u8 high = IWL_RATE_INVALID;
885 u8 low = IWL_RATE_INVALID;
886
887 /* 802.11A or ht walks to the next literal adjacent rate in
888 * the rate table */
5aa33553 889 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
8ca151b5
JB		 890 int i;
891 u32 mask;
892
893 /* Find the previous rate that is in the rate mask */
894 i = index - 1;
895 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
896 if (rate_mask & mask) {
897 low = i;
898 break;
899 }
900 }
901
902 /* Find the next rate that is in the rate mask */
903 i = index + 1;
904 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
905 if (rate_mask & mask) {
906 high = i;
907 break;
908 }
909 }
910
911 return (high << 8) | low;
912 }
913
914 low = index;
915 while (low != IWL_RATE_INVALID) {
916 low = iwl_rates[low].prev_rs;
917 if (low == IWL_RATE_INVALID)
918 break;
919 if (rate_mask & (1 << low))
920 break;
8ca151b5
JB		 921 }
922
923 high = index;
924 while (high != IWL_RATE_INVALID) {
925 high = iwl_rates[high].next_rs;
926 if (high == IWL_RATE_INVALID)
927 break;
928 if (rate_mask & (1 << high))
929 break;
8ca151b5
JB		 930 }
931
932 return (high << 8) | low;
933}
934
e07be6d3
ES		 935static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
936 struct rs_rate *rate)
8ca151b5 937{
e07be6d3
ES		 938 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
939}
940
941/* Get the next supported lower rate in the current column.
942 * Return true if bottom rate in the current column was reached
943 */
944static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
945 struct rs_rate *rate)
946{
947 u8 low;
8ca151b5 948 u16 high_low;
e07be6d3 949 u16 rate_mask;
ae969afe 950 struct iwl_mvm *mvm = lq_sta->pers.drv;
e07be6d3
ES		 951
952 rate_mask = rs_get_supported_rates(lq_sta, rate);
953 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
954 rate->type);
955 low = high_low & 0xff;
956
957 /* Bottom rate of column reached */
958 if (low == IWL_RATE_INVALID)
959 return true;
960
961 rate->index = low;
962 return false;
963}
964
965/* Get the next rate to use following a column downgrade */
966static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
967 struct rs_rate *rate)
968{
ae969afe 969 struct iwl_mvm *mvm = lq_sta->pers.drv;
8ca151b5 970
e07be6d3
ES		 971 if (is_legacy(rate)) {
972 /* No column to downgrade from Legacy */
973 return;
974 } else if (is_siso(rate)) {
975 /* Downgrade to Legacy if we were in SISO */
8ca151b5 976 if (lq_sta->band == IEEE80211_BAND_5GHZ)
5aa33553 977 rate->type = LQ_LEGACY_A;
8ca151b5 978 else
5aa33553 979 rate->type = LQ_LEGACY_G;
8ca151b5 980
a56db7d1 981 rate->bw = RATE_MCS_CHAN_WIDTH_20;
8ca151b5 982
b800040d 983 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
e07be6d3 984 rate->index > IWL_RATE_MCS_9_INDEX);
8ca151b5 985
e07be6d3 986 rate->index = rs_ht_to_legacy[rate->index];
a3576ff2 987 rate->ldpc = false;
e07be6d3
ES		 988 } else {
989 /* Downgrade to SISO with same MCS if in MIMO */
990 rate->type = is_vht_mimo2(rate) ?
991 LQ_VHT_SISO : LQ_HT_SISO;
8ca151b5
JB		 992 }
993
e07be6d3 994 if (num_of_ant(rate->ant) > 1)
a0544272 995 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
8ca151b5 996
e07be6d3
ES		 997 /* Relevant in both switching to SISO or Legacy */
998 rate->sgi = false;
999
1000 if (!rs_rate_supported(lq_sta, rate))
1001 rs_get_lower_rate_in_column(lq_sta, rate);
8ca151b5
JB		 1002}
1003
929e6ede
ES		 1004/* Check if both rates are identical */
1005static inline bool rs_rate_equal(struct rs_rate *a,
5aa33553 1006 struct rs_rate *b)
929e6ede
ES		 1007{
1008 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1009 (a->ldpc == b->ldpc) && (a->index == b->index) &&
1010 (a->ant == b->ant);
1011}
1012
1013/* Check if both rates share the same column */
1014static inline bool rs_rate_column_match(struct rs_rate *a,
1015 struct rs_rate *b)
8ca151b5 1016{
d8bafeaf
ES		 1017 bool ant_match;
1018
1019 if (a->stbc)
1020 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1021 else
1022 ant_match = (a->ant == b->ant);
1023
1024 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1025 && ant_match;
8ca151b5
JB		 1026}
1027
1ebc8f2e
ES		 1028static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1029{
1030 u8 tid = IWL_MAX_TID_COUNT;
1031
1032 if (ieee80211_is_data_qos(hdr->frame_control)) {
1033 u8 *qc = ieee80211_get_qos_ctl(hdr);
1034 tid = qc[0] & 0xf;
1035 }
1036
1037 if (unlikely(tid > IWL_MAX_TID_COUNT))
1038 tid = IWL_MAX_TID_COUNT;
1039
1040 return tid;
1041}
1042
1043void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1044 int tid, struct ieee80211_tx_info *info)
8ca151b5
JB		 1045{
1046 int legacy_success;
1047 int retries;
929e6ede 1048 int i;
8ca151b5 1049 struct iwl_lq_cmd *table;
929e6ede
ES		 1050 u32 lq_hwrate;
1051 struct rs_rate lq_rate, tx_resp_rate;
8ca151b5 1052 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
2fd647f8 1053 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
929e6ede 1054 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1ebc8f2e
ES		 1055 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1056 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
8ca151b5 1057
8ca151b5
JB		 1058 /* Treat uninitialized rate scaling data same as non-existing. */
1059 if (!lq_sta) {
1060 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1061 return;
ae969afe 1062 } else if (!lq_sta->pers.drv) {
8ca151b5
JB		 1063 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1064 return;
1065 }
1066
8e96440e 1067#ifdef CONFIG_MAC80211_DEBUGFS
87d5e415 1068 /* Disable last tx check if we are debugging with fixed rate */
ae969afe 1069 if (lq_sta->pers.dbg_fixed_rate) {
87d5e415
ES		 1070 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1071 return;
1072 }
1073#endif
8ca151b5
JB		 1074 /* This packet was aggregated but doesn't carry status info */
1075 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1076 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1077 return;
1078
87d5e415 1079 if (time_after(jiffies,
834437da
ES		 1080 (unsigned long)(lq_sta->last_tx +
1081 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
efad21d2
JB		 1082 int t;
1083
87d5e415 1084 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
efad21d2
JB		 1085 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1086 ieee80211_stop_tx_ba_session(sta, t);
87d5e415 1087
1ebc8f2e 1088 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
87d5e415
ES		 1089 return;
1090 }
1091 lq_sta->last_tx = jiffies;
1092
929e6ede
ES		 1093 /* Ignore this Tx frame response if its initial rate doesn't match
1094 * that of latest Link Quality command. There may be stragglers
1095 * from a previous Link Quality command, but we're no longer interested
1096 * in those; they're either from the "active" mode while we're trying
1097 * to check "search" mode, or a prior "search" mode after we've moved
1098 * to a new "search" mode (which might become the new "active" mode).
1099 */
1100 table = &lq_sta->lq;
1101 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1102 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1103 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1104
8ca151b5 1105 /* Here we actually compare this rate to the latest LQ command */
929e6ede 1106 if (!rs_rate_equal(&tx_resp_rate, &lq_rate)) {
8ca151b5 1107 IWL_DEBUG_RATE(mvm,
929e6ede
ES		 1108 "initial tx resp rate 0x%x does not match 0x%x\n",
1109 tx_resp_hwrate, lq_hwrate);
1110
8ca151b5
JB		 1111 /*
1112 * Since rates mis-match, the last LQ command may have failed.
1113 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1114 * ... driver.
1115 */
1116 lq_sta->missed_rate_counter++;
834437da 1117 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
8ca151b5 1118 lq_sta->missed_rate_counter = 0;
b3b06a32
ES		 1119 IWL_DEBUG_RATE(mvm,
1120 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1121 lq_sta->rs_state);
9e680946 1122 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1123 }
1124 /* Regardless, ignore this status info for outdated rate */
1125 return;
1126 } else
1127 /* Rate did match, so reset the missed_rate_counter */
1128 lq_sta->missed_rate_counter = 0;
1129
26a2cc01 1130 if (!lq_sta->search_better_tbl) {
8ca151b5
JB		 1131 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1132 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
26a2cc01 1133 } else {
8ca151b5
JB		 1134 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1135 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
26a2cc01
ES		 1136 }
1137
929e6ede 1138 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
8ca151b5
JB		 1139 IWL_DEBUG_RATE(mvm,
1140 "Neither active nor search matches tx rate\n");
1141 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 1142 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
8ca151b5 1143 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553 1144 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
929e6ede 1145 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
5aa33553 1146
8ca151b5
JB		 1147 /*
1148 * no matching table found, let's by-pass the data collection
1149 * and continue to perform rate scale to find the rate table
1150 */
1151 rs_stay_in_table(lq_sta, true);
1152 goto done;
1153 }
1154
1155 /*
1156 * Updating the frame history depends on whether packets were
1157 * aggregated.
1158 *
1159 * For aggregation, all packets were transmitted at the same rate, the
1160 * first index into rate scale table.
1161 */
1162 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
d6bda667
ES		 1163 /* ampdu_ack_len = 0 marks no BA was received. In this case
1164 * treat it as a single frame loss as we don't want the success
1165 * ratio to dip too quickly because a BA wasn't received
1166 */
1167 if (info->status.ampdu_ack_len == 0)
1168 info->status.ampdu_len = 1;
1169
929e6ede 1170 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
8ca151b5 1171 info->status.ampdu_len,
2fd647f8
EP		 1172 info->status.ampdu_ack_len,
1173 reduced_txp);
8ca151b5
JB		 1174
1175 /* Update success/fail counts if not searching for new mode */
b3b06a32 1176 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1177 lq_sta->total_success += info->status.ampdu_ack_len;
1178 lq_sta->total_failed += (info->status.ampdu_len -
1179 info->status.ampdu_ack_len);
1180 }
1181 } else {
1182 /*
1183 * For legacy, update frame history with for each Tx retry.
1184 */
1185 retries = info->status.rates[0].count - 1;
1186 /* HW doesn't send more than 15 retries */
1187 retries = min(retries, 15);
1188
1189 /* The last transmission may have been successful */
1190 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1191 /* Collect data for each rate used during failed TX attempts */
1192 for (i = 0; i <= retries; ++i) {
929e6ede
ES		 1193 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1194 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1195 &lq_rate);
8ca151b5
JB		 1196 /*
1197 * Only collect stats if retried rate is in the same RS
1198 * table as active/search.
1199 */
929e6ede 1200 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
8ca151b5 1201 tmp_tbl = curr_tbl;
929e6ede
ES		 1202 else if (rs_rate_column_match(&lq_rate,
1203 &other_tbl->rate))
8ca151b5 1204 tmp_tbl = other_tbl;
4107dbd2 1205 else
8ca151b5 1206 continue;
4107dbd2 1207
929e6ede
ES		 1208 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1209 1, i < retries ? 0 : legacy_success,
2fd647f8 1210 reduced_txp);
8ca151b5
JB		 1211 }
1212
1213 /* Update success/fail counts if not searching for new mode */
b3b06a32 1214 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1215 lq_sta->total_success += legacy_success;
1216 lq_sta->total_failed += retries + (1 - legacy_success);
1217 }
1218 }
1219 /* The last TX rate is cached in lq_sta; it's set in if/else above */
929e6ede 1220 lq_sta->last_rate_n_flags = lq_hwrate;
2fd647f8 1221 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
8ca151b5
JB		 1222done:
1223 /* See if there's a better rate or modulation mode to try. */
8dfc2751 1224 if (sta->supp_rates[info->band])
1ebc8f2e
ES		 1225 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1226}
1227
1228/*
1229 * mac80211 sends us Tx status
1230 */
1231static void rs_mac80211_tx_status(void *mvm_r,
1232 struct ieee80211_supported_band *sband,
1233 struct ieee80211_sta *sta, void *priv_sta,
1234 struct sk_buff *skb)
1235{
1236 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1237 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1238 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1239 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1240
1241 if (!ieee80211_is_data(hdr->frame_control) ||
1242 info->flags & IEEE80211_TX_CTL_NO_ACK)
1243 return;
1244
1245 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
8ca151b5
JB		 1246}
1247
1248/*
1249 * Begin a period of staying with a selected modulation mode.
1250 * Set "stay_in_tbl" flag to prevent any mode switches.
1251 * Set frame tx success limits according to legacy vs. high-throughput,
1252 * and reset overall (spanning all rates) tx success history statistics.
1253 * These control how long we stay using same modulation mode before
1254 * searching for a new mode.
1255 */
1256static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1257 struct iwl_lq_sta *lq_sta)
1258{
b3b06a32
ES		 1259 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1260 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
8ca151b5 1261 if (is_legacy) {
834437da
ES		 1262 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1263 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1264 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
8ca151b5 1265 } else {
834437da
ES		 1266 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1267 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1268 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
8ca151b5
JB		 1269 }
1270 lq_sta->table_count = 0;
1271 lq_sta->total_failed = 0;
1272 lq_sta->total_success = 0;
1273 lq_sta->flush_timer = jiffies;
b3b06a32 1274 lq_sta->visited_columns = 0;
8ca151b5
JB		 1275}
1276
6a028d9a
ES		 1277static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1278{
1279 if (rate_mask)
1280 return find_last_bit(&rate_mask, BITS_PER_LONG);
1281 return IWL_RATE_INVALID;
1282}
1283
198266a3
ES		 1284static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1285 const struct rs_tx_column *column)
1286{
1287 switch (column->mode) {
1288 case RS_LEGACY:
1289 return lq_sta->max_legacy_rate_idx;
1290 case RS_SISO:
1291 return lq_sta->max_siso_rate_idx;
1292 case RS_MIMO2:
1293 return lq_sta->max_mimo2_rate_idx;
1294 default:
1295 WARN_ON_ONCE(1);
1296 }
1297
1298 return lq_sta->max_legacy_rate_idx;
1299}
1300
a34529e8 1301static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
198266a3
ES		 1302 const struct rs_tx_column *column,
1303 u32 bw)
8ca151b5
JB		 1304{
1305 /* Used to choose among HT tables */
a34529e8 1306 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
8ca151b5 1307
b3b06a32
ES		 1308 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1309 column->mode != RS_SISO &&
1310 column->mode != RS_MIMO2))
1311 return expected_tpt_legacy;
8ca151b5
JB		 1312
1313 /* Legacy rates have only one table */
b3b06a32
ES		 1314 if (column->mode == RS_LEGACY)
1315 return expected_tpt_legacy;
8ca151b5 1316
d310e405 1317 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
8ca151b5 1318 /* Choose among many HT tables depending on number of streams
d310e405 1319 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
8ca151b5 1320 * status */
b3b06a32
ES		 1321 if (column->mode == RS_SISO) {
1322 switch (bw) {
d310e405
ES		 1323 case RATE_MCS_CHAN_WIDTH_20:
1324 ht_tbl_pointer = expected_tpt_siso_20MHz;
1325 break;
1326 case RATE_MCS_CHAN_WIDTH_40:
1327 ht_tbl_pointer = expected_tpt_siso_40MHz;
1328 break;
1329 case RATE_MCS_CHAN_WIDTH_80:
1330 ht_tbl_pointer = expected_tpt_siso_80MHz;
1331 break;
1332 default:
1333 WARN_ON_ONCE(1);
1334 }
b3b06a32
ES		 1335 } else if (column->mode == RS_MIMO2) {
1336 switch (bw) {
d310e405
ES		 1337 case RATE_MCS_CHAN_WIDTH_20:
1338 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1339 break;
1340 case RATE_MCS_CHAN_WIDTH_40:
1341 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1342 break;
1343 case RATE_MCS_CHAN_WIDTH_80:
1344 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1345 break;
1346 default:
1347 WARN_ON_ONCE(1);
1348 }
1349 } else {
1350 WARN_ON_ONCE(1);
d972ab31 1351 }
8ca151b5 1352
b3b06a32
ES		 1353 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1354 return ht_tbl_pointer[0];
1355 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1356 return ht_tbl_pointer[1];
1357 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1358 return ht_tbl_pointer[2];
8ca151b5 1359 else /* AGG+SGI */
b3b06a32
ES		 1360 return ht_tbl_pointer[3];
1361}
1362
1363static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1364 struct iwl_scale_tbl_info *tbl)
1365{
1366 struct rs_rate *rate = &tbl->rate;
1367 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1368
1369 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
8ca151b5
JB		 1370}
1371
8ca151b5
JB		 1372static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1373 struct iwl_lq_sta *lq_sta,
1374 struct iwl_scale_tbl_info *tbl, /* "search" */
80763515 1375 unsigned long rate_mask, s8 index)
8ca151b5 1376{
8ca151b5
JB		 1377 struct iwl_scale_tbl_info *active_tbl =
1378 &(lq_sta->lq_info[lq_sta->active_tbl]);
80763515
ES		 1379 s32 success_ratio = active_tbl->win[index].success_ratio;
1380 u16 expected_current_tpt = active_tbl->expected_tpt[index];
a34529e8 1381 const u16 *tpt_tbl = tbl->expected_tpt;
8ca151b5 1382 u16 high_low;
80763515
ES		 1383 u32 target_tpt;
1384 int rate_idx;
8ca151b5 1385
834437da 1386 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
80763515
ES		 1387 target_tpt = 100 * expected_current_tpt;
1388 IWL_DEBUG_RATE(mvm,
1389 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1390 success_ratio, target_tpt);
1391 } else {
1392 target_tpt = lq_sta->last_tpt;
1393 IWL_DEBUG_RATE(mvm,
1394 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1395 success_ratio, target_tpt);
1396 }
8ca151b5 1397
80763515 1398 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
8ca151b5 1399
80763515
ES		 1400 while (rate_idx != IWL_RATE_INVALID) {
1401 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1402 break;
8ca151b5 1403
80763515
ES		 1404 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1405 tbl->rate.type);
8ca151b5 1406
80763515 1407 rate_idx = (high_low >> 8) & 0xff;
8ca151b5
JB		 1408 }
1409
80763515
ES		 1410 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1411 rate_idx, target_tpt,
1412 rate_idx != IWL_RATE_INVALID ?
1413 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1414
1415 return rate_idx;
8ca151b5
JB		 1416}
1417
5aa33553 1418static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
d310e405
ES		 1419{
1420 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
5aa33553 1421 return RATE_MCS_CHAN_WIDTH_80;
d310e405 1422 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
5aa33553
ES		 1423 return RATE_MCS_CHAN_WIDTH_40;
1424
1425 return RATE_MCS_CHAN_WIDTH_20;
d310e405
ES		 1426}
1427
8ca151b5
JB		 1428/*
1429 * Check whether we should continue using same modulation mode, or
1430 * begin search for a new mode, based on:
1431 * 1) # tx successes or failures while using this mode
1432 * 2) # times calling this function
1433 * 3) elapsed time in this mode (not used, for now)
1434 */
1435static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1436{
1437 struct iwl_scale_tbl_info *tbl;
8ca151b5
JB		 1438 int active_tbl;
1439 int flush_interval_passed = 0;
1440 struct iwl_mvm *mvm;
1441
ae969afe 1442 mvm = lq_sta->pers.drv;
8ca151b5
JB		 1443 active_tbl = lq_sta->active_tbl;
1444
1445 tbl = &(lq_sta->lq_info[active_tbl]);
1446
1447 /* If we've been disallowing search, see if we should now allow it */
b3b06a32 1448 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1449 /* Elapsed time using current modulation mode */
1450 if (lq_sta->flush_timer)
1451 flush_interval_passed =
1452 time_after(jiffies,
1453 (unsigned long)(lq_sta->flush_timer +
834437da 1454 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
8ca151b5
JB		 1455
1456 /*
1457 * Check if we should allow search for new modulation mode.
1458 * If many frames have failed or succeeded, or we've used
1459 * this same modulation for a long time, allow search, and
1460 * reset history stats that keep track of whether we should
1461 * allow a new search. Also (below) reset all bitmaps and
1462 * stats in active history.
1463 */
1464 if (force_search ||
1465 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1466 (lq_sta->total_success > lq_sta->max_success_limit) ||
1467 ((!lq_sta->search_better_tbl) &&
1468 (lq_sta->flush_timer) && (flush_interval_passed))) {
1469 IWL_DEBUG_RATE(mvm,
1470 "LQ: stay is expired %d %d %d\n",
1471 lq_sta->total_failed,
1472 lq_sta->total_success,
1473 flush_interval_passed);
1474
1475 /* Allow search for new mode */
b3b06a32
ES		 1476 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1477 IWL_DEBUG_RATE(mvm,
1478 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
8ca151b5
JB		 1479 lq_sta->total_failed = 0;
1480 lq_sta->total_success = 0;
1481 lq_sta->flush_timer = 0;
b3b06a32
ES		 1482 /* mark the current column as visited */
1483 lq_sta->visited_columns = BIT(tbl->column);
8ca151b5
JB		 1484 /*
1485 * Else if we've used this modulation mode enough repetitions
1486 * (regardless of elapsed time or success/failure), reset
1487 * history bitmaps and rate-specific stats for all rates in
1488 * active table.
1489 */
1490 } else {
1491 lq_sta->table_count++;
1492 if (lq_sta->table_count >=
1493 lq_sta->table_count_limit) {
1494 lq_sta->table_count = 0;
1495
1496 IWL_DEBUG_RATE(mvm,
1497 "LQ: stay in table clear win\n");
b804eeb6 1498 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1499 }
1500 }
1501
1502 /* If transitioning to allow "search", reset all history
1503 * bitmaps and stats in active table (this will become the new
1504 * "search" table). */
b3b06a32 1505 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
b804eeb6 1506 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1507 }
1508 }
1509}
1510
1511/*
1512 * setup rate table in uCode
1513 */
1514static void rs_update_rate_tbl(struct iwl_mvm *mvm,
9145d151 1515 struct ieee80211_sta *sta,
8ca151b5 1516 struct iwl_lq_sta *lq_sta,
5aa33553 1517 struct rs_rate *rate)
8ca151b5 1518{
8fc7c58c 1519 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
9e680946 1520 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1521}
1522
b3b06a32
ES		 1523static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1524 struct iwl_lq_sta *lq_sta,
1525 struct ieee80211_sta *sta,
1526 struct iwl_scale_tbl_info *tbl)
1527{
198266a3 1528 int i, j, max_rate;
b3b06a32
ES		 1529 enum rs_column next_col_id;
1530 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1531 const struct rs_tx_column *next_col;
1532 allow_column_func_t allow_func;
a0544272 1533 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
a34529e8 1534 const u16 *expected_tpt_tbl;
198266a3 1535 u16 tpt, max_expected_tpt;
b3b06a32
ES		 1536
1537 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1538 next_col_id = curr_col->next_columns[i];
1539
1540 if (next_col_id == RS_COLUMN_INVALID)
1541 continue;
1542
1543 if (lq_sta->visited_columns & BIT(next_col_id)) {
1544 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1545 next_col_id);
1546 continue;
1547 }
1548
1549 next_col = &rs_tx_columns[next_col_id];
1550
1551 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1552 IWL_DEBUG_RATE(mvm,
1553 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1554 next_col_id, valid_ants, next_col->ant);
1555 continue;
1556 }
1557
1558 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1559 allow_func = next_col->checks[j];
1560 if (allow_func && !allow_func(mvm, sta, tbl))
1561 break;
1562 }
1563
1564 if (j != MAX_COLUMN_CHECKS) {
1565 IWL_DEBUG_RATE(mvm,
1566 "Skip column %d: not allowed (check %d failed)\n",
1567 next_col_id, j);
1568
1569 continue;
1570 }
1571
1572 tpt = lq_sta->last_tpt / 100;
1573 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
049e0c33 1574 rs_bw_from_sta_bw(sta));
b3b06a32
ES		 1575 if (WARN_ON_ONCE(!expected_tpt_tbl))
1576 continue;
1577
198266a3 1578 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
6a028d9a
ES		 1579 if (max_rate == IWL_RATE_INVALID) {
1580 IWL_DEBUG_RATE(mvm,
1581 "Skip column %d: no rate is allowed in this column\n",
1582 next_col_id);
198266a3 1583 continue;
6a028d9a 1584 }
b3b06a32 1585
198266a3 1586 max_expected_tpt = expected_tpt_tbl[max_rate];
b3b06a32
ES		 1587 if (tpt >= max_expected_tpt) {
1588 IWL_DEBUG_RATE(mvm,
1589 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1590 next_col_id, max_expected_tpt, tpt);
1591 continue;
1592 }
1593
198266a3
ES		 1594 IWL_DEBUG_RATE(mvm,
1595 "Found potential column %d. Max expected %d current %d\n",
1596 next_col_id, max_expected_tpt, tpt);
b3b06a32
ES		 1597 break;
1598 }
1599
1600 if (i == MAX_NEXT_COLUMNS)
1601 return RS_COLUMN_INVALID;
1602
b3b06a32
ES		 1603 return next_col_id;
1604}
1605
1606static int rs_switch_to_column(struct iwl_mvm *mvm,
1607 struct iwl_lq_sta *lq_sta,
1608 struct ieee80211_sta *sta,
1609 enum rs_column col_id)
1610{
1611 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1612 struct iwl_scale_tbl_info *search_tbl =
1613 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1614 struct rs_rate *rate = &search_tbl->rate;
1615 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1616 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1617 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1618 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
80763515 1619 unsigned long rate_mask = 0;
b3b06a32
ES		 1620 u32 rate_idx = 0;
1621
1622 memcpy(search_tbl, tbl, sz);
1623
1624 rate->sgi = column->sgi;
1625 rate->ant = column->ant;
1626
1627 if (column->mode == RS_LEGACY) {
1628 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1629 rate->type = LQ_LEGACY_A;
1630 else
1631 rate->type = LQ_LEGACY_G;
1632
d8bafeaf
ES		 1633 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1634 rate->ldpc = false;
b3b06a32
ES		 1635 rate_mask = lq_sta->active_legacy_rate;
1636 } else if (column->mode == RS_SISO) {
1637 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1638 rate_mask = lq_sta->active_siso_rate;
1639 } else if (column->mode == RS_MIMO2) {
1640 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1641 rate_mask = lq_sta->active_mimo2_rate;
1642 } else {
1643 WARN_ON_ONCE("Bad column mode");
1644 }
1645
d8bafeaf
ES		 1646 if (column->mode != RS_LEGACY) {
1647 rate->bw = rs_bw_from_sta_bw(sta);
1648 rate->ldpc = lq_sta->ldpc;
1649 }
1650
b3b06a32
ES		 1651 search_tbl->column = col_id;
1652 rs_set_expected_tpt_table(lq_sta, search_tbl);
1653
75d3e2d6
ES		 1654 lq_sta->visited_columns |= BIT(col_id);
1655
b3b06a32
ES		 1656 /* Get the best matching rate if we're changing modes. e.g.
1657 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1658 */
1659 if (curr_column->mode != column->mode) {
1660 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1661 rate_mask, rate->index);
1662
1663 if ((rate_idx == IWL_RATE_INVALID) ||
1664 !(BIT(rate_idx) & rate_mask)) {
1665 IWL_DEBUG_RATE(mvm,
1666 "can not switch with index %d"
80763515 1667 " rate mask %lx\n",
b3b06a32
ES		 1668 rate_idx, rate_mask);
1669
1670 goto err;
1671 }
1672
1673 rate->index = rate_idx;
1674 }
1675
b3b06a32
ES		 1676 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1677 col_id, rate->index);
1678
b3b06a32
ES		 1679 return 0;
1680
1681err:
1682 rate->type = LQ_NONE;
1683 return -1;
1684}
1685
4e4b815c
ES		 1686static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1687 struct iwl_scale_tbl_info *tbl,
1688 s32 sr, int low, int high,
1689 int current_tpt,
1690 int low_tpt, int high_tpt)
1691{
1692 enum rs_action action = RS_ACTION_STAY;
1693
834437da
ES		 1694 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1695 (current_tpt == 0)) {
4e4b815c 1696 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1697 "Decrease rate because of low SR\n");
1698 return RS_ACTION_DOWNSCALE;
4e4b815c
ES		 1699 }
1700
e53839eb
ES		 1701 if ((low_tpt == IWL_INVALID_VALUE) &&
1702 (high_tpt == IWL_INVALID_VALUE) &&
1703 (high != IWL_RATE_INVALID)) {
4e4b815c 1704 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1705 "No data about high/low rates. Increase rate\n");
1706 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1707 }
1708
e53839eb
ES		 1709 if ((high_tpt == IWL_INVALID_VALUE) &&
1710 (high != IWL_RATE_INVALID) &&
1711 (low_tpt != IWL_INVALID_VALUE) &&
1712 (low_tpt < current_tpt)) {
1713 IWL_DEBUG_RATE(mvm,
1714 "No data about high rate and low rate is worse. Increase rate\n");
1715 return RS_ACTION_UPSCALE;
1716 }
4e4b815c 1717
e53839eb
ES		 1718 if ((high_tpt != IWL_INVALID_VALUE) &&
1719 (high_tpt > current_tpt)) {
1720 IWL_DEBUG_RATE(mvm,
1721 "Higher rate is better. Increate rate\n");
1722 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1723 }
1724
e53839eb
ES		 1725 if ((low_tpt != IWL_INVALID_VALUE) &&
1726 (high_tpt != IWL_INVALID_VALUE) &&
1727 (low_tpt < current_tpt) &&
1728 (high_tpt < current_tpt)) {
4e4b815c 1729 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1730 "Both high and low are worse. Maintain rate\n");
1731 return RS_ACTION_STAY;
1732 }
1733
1734 if ((low_tpt != IWL_INVALID_VALUE) &&
1735 (low_tpt > current_tpt)) {
1736 IWL_DEBUG_RATE(mvm,
1737 "Lower rate is better\n");
1738 action = RS_ACTION_DOWNSCALE;
1739 goto out;
1740 }
1741
1742 if ((low_tpt == IWL_INVALID_VALUE) &&
1743 (low != IWL_RATE_INVALID)) {
4e4b815c 1744 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1745 "No data about lower rate\n");
1746 action = RS_ACTION_DOWNSCALE;
1747 goto out;
1748 }
1749
1750 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1751
1752out:
1753 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
834437da 1754 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
e53839eb
ES		 1755 IWL_DEBUG_RATE(mvm,
1756 "SR is above NO DECREASE. Avoid downscale\n");
1757 action = RS_ACTION_STAY;
1758 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1759 IWL_DEBUG_RATE(mvm,
1760 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1761 action = RS_ACTION_STAY;
1762 } else {
1763 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1764 }
4e4b815c
ES		 1765 }
1766
1767 return action;
1768}
b3b06a32 1769
d8bafeaf
ES		 1770static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1771 struct iwl_lq_sta *lq_sta)
1772{
d8bafeaf
ES		 1773 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1774 * supports STBC of at least 1*SS
1775 */
3d44eebf 1776 if (!lq_sta->stbc_capable)
d8bafeaf
ES		 1777 return false;
1778
d8bafeaf
ES		 1779 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1780 return false;
1781
1782 return true;
1783}
1784
2fd647f8
EP		 1785static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1786 int *weaker, int *stronger)
1787{
834437da 1788 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2fd647f8
EP		 1789 if (*weaker > TPC_MAX_REDUCTION)
1790 *weaker = TPC_INVALID;
1791
834437da 1792 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2fd647f8
EP		 1793 if (*stronger < 0)
1794 *stronger = TPC_INVALID;
1795}
1796
1e9551de
ES		 1797static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1798 struct rs_rate *rate, enum ieee80211_band band)
2fd647f8
EP		 1799{
1800 int index = rate->index;
1e9551de
ES		 1801 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1802 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1803 !vif->bss_conf.ps);
2fd647f8 1804
1e9551de
ES		 1805 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1806 cam, sta_ps_disabled);
2fd647f8
EP		 1807 /*
1808 * allow tpc only if power management is enabled, or bt coex
1809 * activity grade allows it and we are on 2.4Ghz.
1810 */
1e9551de 1811 if ((cam || sta_ps_disabled) &&
2fd647f8
EP		 1812 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1813 return false;
1814
1815 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1816 if (is_legacy(rate))
1817 return index == IWL_RATE_54M_INDEX;
1818 if (is_ht(rate))
1819 return index == IWL_RATE_MCS_7_INDEX;
1820 if (is_vht(rate))
1821 return index == IWL_RATE_MCS_7_INDEX ||
1822 index == IWL_RATE_MCS_8_INDEX ||
1823 index == IWL_RATE_MCS_9_INDEX;
1824
1825 WARN_ON_ONCE(1);
1826 return false;
1827}
1828
1829enum tpc_action {
1830 TPC_ACTION_STAY,
1831 TPC_ACTION_DECREASE,
1832 TPC_ACTION_INCREASE,
1833 TPC_ACTION_NO_RESTIRCTION,
1834};
1835
1836static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1837 s32 sr, int weak, int strong,
1838 int current_tpt,
1839 int weak_tpt, int strong_tpt)
1840{
1841 /* stay until we have valid tpt */
1842 if (current_tpt == IWL_INVALID_VALUE) {
1843 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1844 return TPC_ACTION_STAY;
1845 }
1846
1847 /* Too many failures, increase txp */
834437da
ES		 1848 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1849 current_tpt == 0) {
2fd647f8
EP		 1850 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1851 return TPC_ACTION_NO_RESTIRCTION;
1852 }
1853
1854 /* try decreasing first if applicable */
1855 if (weak != TPC_INVALID) {
1856 if (weak_tpt == IWL_INVALID_VALUE &&
1857 (strong_tpt == IWL_INVALID_VALUE ||
1858 current_tpt >= strong_tpt)) {
1859 IWL_DEBUG_RATE(mvm,
1860 "no weak txp measurement. decrease txp\n");
1861 return TPC_ACTION_DECREASE;
1862 }
1863
1864 if (weak_tpt > current_tpt) {
1865 IWL_DEBUG_RATE(mvm,
1866 "lower txp has better tpt. decrease txp\n");
1867 return TPC_ACTION_DECREASE;
1868 }
1869 }
1870
1871 /* next, increase if needed */
834437da
ES		 1872 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1873 strong != TPC_INVALID) {
2fd647f8
EP		 1874 if (weak_tpt == IWL_INVALID_VALUE &&
1875 strong_tpt != IWL_INVALID_VALUE &&
1876 current_tpt < strong_tpt) {
1877 IWL_DEBUG_RATE(mvm,
1878 "higher txp has better tpt. increase txp\n");
1879 return TPC_ACTION_INCREASE;
1880 }
1881
1882 if (weak_tpt < current_tpt &&
1883 (strong_tpt == IWL_INVALID_VALUE ||
1884 strong_tpt > current_tpt)) {
1885 IWL_DEBUG_RATE(mvm,
1886 "lower txp has worse tpt. increase txp\n");
1887 return TPC_ACTION_INCREASE;
1888 }
1889 }
1890
1891 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1892 return TPC_ACTION_STAY;
1893}
1894
1895static bool rs_tpc_perform(struct iwl_mvm *mvm,
1896 struct ieee80211_sta *sta,
1897 struct iwl_lq_sta *lq_sta,
1898 struct iwl_scale_tbl_info *tbl)
1899{
9d8ce6af 1900 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2fd647f8
EP		 1901 struct ieee80211_vif *vif = mvm_sta->vif;
1902 struct ieee80211_chanctx_conf *chanctx_conf;
1903 enum ieee80211_band band;
1904 struct iwl_rate_scale_data *window;
1905 struct rs_rate *rate = &tbl->rate;
1906 enum tpc_action action;
1907 s32 sr;
1908 u8 cur = lq_sta->lq.reduced_tpc;
1909 int current_tpt;
1910 int weak, strong;
1911 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1912
9a75b3df 1913#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 1914 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
3c6acb61 1915 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
ae969afe
EP		 1916 lq_sta->pers.dbg_fixed_txp_reduction);
1917 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1918 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
9a75b3df
EP		 1919 }
1920#endif
1921
2fd647f8
EP		 1922 rcu_read_lock();
1923 chanctx_conf = rcu_dereference(vif->chanctx_conf);
1924 if (WARN_ON(!chanctx_conf))
1925 band = IEEE80211_NUM_BANDS;
1926 else
1927 band = chanctx_conf->def.chan->band;
1928 rcu_read_unlock();
1929
1e9551de 1930 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2fd647f8 1931 IWL_DEBUG_RATE(mvm,
3c6acb61 1932 "tpc is not allowed. remove txp restrictions\n");
2fd647f8
EP		 1933 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1934 return cur != TPC_NO_REDUCTION;
1935 }
1936
1937 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1938
1939 /* Collect measured throughputs for current and adjacent rates */
1940 window = tbl->tpc_win;
1941 sr = window[cur].success_ratio;
1942 current_tpt = window[cur].average_tpt;
1943 if (weak != TPC_INVALID)
1944 weak_tpt = window[weak].average_tpt;
1945 if (strong != TPC_INVALID)
1946 strong_tpt = window[strong].average_tpt;
1947
1948 IWL_DEBUG_RATE(mvm,
1949 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1950 cur, current_tpt, sr, weak, strong,
1951 weak_tpt, strong_tpt);
1952
1953 action = rs_get_tpc_action(mvm, sr, weak, strong,
1954 current_tpt, weak_tpt, strong_tpt);
1955
1956 /* override actions if we are on the edge */
1957 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
3c6acb61 1958 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2fd647f8
EP		 1959 action = TPC_ACTION_STAY;
1960 } else if (strong == TPC_INVALID &&
1961 (action == TPC_ACTION_INCREASE ||
1962 action == TPC_ACTION_NO_RESTIRCTION)) {
3c6acb61 1963 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2fd647f8
EP		 1964 action = TPC_ACTION_STAY;
1965 }
1966
1967 switch (action) {
1968 case TPC_ACTION_DECREASE:
1969 lq_sta->lq.reduced_tpc = weak;
1970 return true;
1971 case TPC_ACTION_INCREASE:
1972 lq_sta->lq.reduced_tpc = strong;
1973 return true;
1974 case TPC_ACTION_NO_RESTIRCTION:
1975 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1976 return true;
1977 case TPC_ACTION_STAY:
1978 /* do nothing */
1979 break;
1980 }
1981 return false;
1982}
1983
8ca151b5
JB		 1984/*
1985 * Do rate scaling and search for new modulation mode.
1986 */
1987static void rs_rate_scale_perform(struct iwl_mvm *mvm,
8ca151b5 1988 struct ieee80211_sta *sta,
1ebc8f2e
ES		 1989 struct iwl_lq_sta *lq_sta,
1990 int tid)
8ca151b5 1991{
8ca151b5
JB		 1992 int low = IWL_RATE_INVALID;
1993 int high = IWL_RATE_INVALID;
1994 int index;
8ca151b5
JB		 1995 struct iwl_rate_scale_data *window = NULL;
1996 int current_tpt = IWL_INVALID_VALUE;
1997 int low_tpt = IWL_INVALID_VALUE;
1998 int high_tpt = IWL_INVALID_VALUE;
1999 u32 fail_count;
4e4b815c 2000 enum rs_action scale_action = RS_ACTION_STAY;
8ca151b5
JB		 2001 u16 rate_mask;
2002 u8 update_lq = 0;
2003 struct iwl_scale_tbl_info *tbl, *tbl1;
8ca151b5
JB		 2004 u8 active_tbl = 0;
2005 u8 done_search = 0;
2006 u16 high_low;
2007 s32 sr;
9d015a03 2008 u8 prev_agg = lq_sta->is_agg;
9d8ce6af 2009 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
8ca151b5 2010 struct iwl_mvm_tid_data *tid_data;
5aa33553 2011 struct rs_rate *rate;
8ca151b5 2012
efed6640 2013 lq_sta->is_agg = !!sta_priv->agg_tids;
8ca151b5
JB		 2014
2015 /*
2016 * Select rate-scale / modulation-mode table to work with in
2017 * the rest of this function: "search" if searching for better
2018 * modulation mode, or "active" if doing rate scaling within a mode.
2019 */
2020 if (!lq_sta->search_better_tbl)
2021 active_tbl = lq_sta->active_tbl;
2022 else
2023 active_tbl = 1 - lq_sta->active_tbl;
2024
2025 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2026 rate = &tbl->rate;
8ca151b5 2027
9d015a03
ES		 2028 if (prev_agg != lq_sta->is_agg) {
2029 IWL_DEBUG_RATE(mvm,
2030 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2031 prev_agg, lq_sta->is_agg);
2032 rs_set_expected_tpt_table(lq_sta, tbl);
b804eeb6 2033 rs_rate_scale_clear_tbl_windows(mvm, tbl);
9d015a03
ES		 2034 }
2035
8ca151b5
JB		 2036 /* current tx rate */
2037 index = lq_sta->last_txrate_idx;
2038
8ca151b5 2039 /* rates available for this association, and for modulation mode */
a8ff14f5 2040 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5 2041
ca6f38ff 2042 if (!(BIT(index) & rate_mask)) {
8ca151b5
JB		 2043 IWL_ERR(mvm, "Current Rate is not valid\n");
2044 if (lq_sta->search_better_tbl) {
2045 /* revert to active table if search table is not valid*/
5aa33553 2046 rate->type = LQ_NONE;
8ca151b5
JB		 2047 lq_sta->search_better_tbl = 0;
2048 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 2049 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
8ca151b5
JB		 2050 }
2051 return;
2052 }
2053
2054 /* Get expected throughput table and history window for current rate */
2055 if (!tbl->expected_tpt) {
2056 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2057 return;
2058 }
2059
2536e7c3 2060 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2061 window = &(tbl->win[index]);
2062
2063 /*
2064 * If there is not enough history to calculate actual average
2065 * throughput, keep analyzing results of more tx frames, without
2066 * changing rate or mode (bypass most of the rest of this function).
2067 * Set up new rate table in uCode only if old rate is not supported
2068 * in current association (use new rate found above).
2069 */
2070 fail_count = window->counter - window->success_counter;
834437da
ES		 2071 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2072 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
8ca151b5 2073 IWL_DEBUG_RATE(mvm,
4d30ee82 2074 "(%s: %d): Test Window: succ %d total %d\n",
5aa33553 2075 rs_pretty_lq_type(rate->type),
4d30ee82 2076 index, window->success_counter, window->counter);
8ca151b5
JB		 2077
2078 /* Can't calculate this yet; not enough history */
2079 window->average_tpt = IWL_INVALID_VALUE;
2080
2081 /* Should we stay with this modulation mode,
2082 * or search for a new one? */
2083 rs_stay_in_table(lq_sta, false);
2084
2085 goto out;
2086 }
2087 /* Else we have enough samples; calculate estimate of
2088 * actual average throughput */
2089 if (window->average_tpt != ((window->success_ratio *
2090 tbl->expected_tpt[index] + 64) / 128)) {
8ca151b5
JB		 2091 window->average_tpt = ((window->success_ratio *
2092 tbl->expected_tpt[index] + 64) / 128);
2093 }
2094
2095 /* If we are searching for better modulation mode, check success. */
2096 if (lq_sta->search_better_tbl) {
2097 /* If good success, continue using the "search" mode;
2098 * no need to send new link quality command, since we're
2099 * continuing to use the setup that we've been trying. */
2100 if (window->average_tpt > lq_sta->last_tpt) {
2101 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2102 "SWITCHING TO NEW TABLE SR: %d "
2103 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2104 window->success_ratio,
2105 window->average_tpt,
2106 lq_sta->last_tpt);
2107
8ca151b5
JB		 2108 /* Swap tables; "search" becomes "active" */
2109 lq_sta->active_tbl = active_tbl;
2110 current_tpt = window->average_tpt;
2111 /* Else poor success; go back to mode in "active" table */
2112 } else {
2113 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2114 "GOING BACK TO THE OLD TABLE: SR %d "
2115 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2116 window->success_ratio,
2117 window->average_tpt,
2118 lq_sta->last_tpt);
2119
2120 /* Nullify "search" table */
5aa33553 2121 rate->type = LQ_NONE;
8ca151b5
JB		 2122
2123 /* Revert to "active" table */
2124 active_tbl = lq_sta->active_tbl;
2125 tbl = &(lq_sta->lq_info[active_tbl]);
2126
2127 /* Revert to "active" rate and throughput info */
8fc7c58c 2128 index = tbl->rate.index;
8ca151b5
JB		 2129 current_tpt = lq_sta->last_tpt;
2130
2131 /* Need to set up a new rate table in uCode */
2132 update_lq = 1;
2133 }
2134
2135 /* Either way, we've made a decision; modulation mode
2136 * search is done, allow rate adjustment next time. */
2137 lq_sta->search_better_tbl = 0;
2138 done_search = 1; /* Don't switch modes below! */
2139 goto lq_update;
2140 }
2141
2142 /* (Else) not in search of better modulation mode, try for better
2143 * starting rate, while staying in this mode. */
ca6f38ff 2144 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
8ca151b5
JB		 2145 low = high_low & 0xff;
2146 high = (high_low >> 8) & 0xff;
2147
2536e7c3 2148 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2149
2150 sr = window->success_ratio;
2151
2152 /* Collect measured throughputs for current and adjacent rates */
2153 current_tpt = window->average_tpt;
2154 if (low != IWL_RATE_INVALID)
2155 low_tpt = tbl->win[low].average_tpt;
2156 if (high != IWL_RATE_INVALID)
2157 high_tpt = tbl->win[high].average_tpt;
2158
4d30ee82
ES		 2159 IWL_DEBUG_RATE(mvm,
2160 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
5aa33553
ES		 2161 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2162 low, high, low_tpt, high_tpt);
4d30ee82 2163
4e4b815c
ES		 2164 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2165 current_tpt, low_tpt, high_tpt);
8ca151b5 2166
393b9e5b 2167 /* Force a search in case BT doesn't like us being in MIMO */
5aa33553 2168 if (is_mimo(rate) &&
393b9e5b 2169 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
4d30ee82
ES		 2170 IWL_DEBUG_RATE(mvm,
2171 "BT Coex forbids MIMO. Search for new config\n");
36946ce6
EG		 2172 rs_stay_in_table(lq_sta, true);
2173 goto lq_update;
2174 }
2175
8ca151b5 2176 switch (scale_action) {
4e4b815c 2177 case RS_ACTION_DOWNSCALE:
8ca151b5
JB		 2178 /* Decrease starting rate, update uCode's rate table */
2179 if (low != IWL_RATE_INVALID) {
2180 update_lq = 1;
2181 index = low;
4d30ee82
ES		 2182 } else {
2183 IWL_DEBUG_RATE(mvm,
2184 "At the bottom rate. Can't decrease\n");
8ca151b5
JB		 2185 }
2186
2187 break;
4e4b815c 2188 case RS_ACTION_UPSCALE:
8ca151b5
JB		 2189 /* Increase starting rate, update uCode's rate table */
2190 if (high != IWL_RATE_INVALID) {
2191 update_lq = 1;
2192 index = high;
4d30ee82
ES		 2193 } else {
2194 IWL_DEBUG_RATE(mvm,
2195 "At the top rate. Can't increase\n");
8ca151b5
JB		 2196 }
2197
2198 break;
4e4b815c 2199 case RS_ACTION_STAY:
8ca151b5 2200 /* No change */
e6c8d602
ES		 2201 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2202 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2fd647f8 2203 break;
8ca151b5
JB		 2204 default:
2205 break;
2206 }
2207
8ca151b5
JB		 2208lq_update:
2209 /* Replace uCode's rate table for the destination station. */
5aa33553
ES		 2210 if (update_lq) {
2211 tbl->rate.index = index;
2212 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2213 }
8ca151b5
JB		 2214
2215 rs_stay_in_table(lq_sta, false);
2216
2217 /*
2218 * Search for new modulation mode if we're:
2219 * 1) Not changing rates right now
2220 * 2) Not just finishing up a search
2221 * 3) Allowing a new search
2222 */
2223 if (!update_lq && !done_search &&
b3b06a32
ES		 2224 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2225 && window->counter) {
2226 enum rs_column next_column;
2227
8ca151b5
JB		 2228 /* Save current throughput to compare with "search" throughput*/
2229 lq_sta->last_tpt = current_tpt;
2230
4d30ee82 2231 IWL_DEBUG_RATE(mvm,
b3b06a32
ES		 2232 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2233 update_lq, done_search, lq_sta->rs_state,
4d30ee82 2234 window->counter);
b3b06a32
ES		 2235
2236 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2237 if (next_column != RS_COLUMN_INVALID) {
2238 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2239 next_column);
2240 if (!ret)
2241 lq_sta->search_better_tbl = 1;
2242 } else {
2243 IWL_DEBUG_RATE(mvm,
2244 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2245 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2246 }
8ca151b5
JB		 2247
2248 /* If new "search" mode was selected, set up in uCode table */
2249 if (lq_sta->search_better_tbl) {
2250 /* Access the "search" table, clear its history. */
2251 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b804eeb6 2252 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 2253
2254 /* Use new "search" start rate */
8fc7c58c 2255 index = tbl->rate.index;
8ca151b5 2256
b3b06a32
ES		 2257 rs_dump_rate(mvm, &tbl->rate,
2258 "Switch to SEARCH TABLE:");
8fc7c58c 2259 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
9e680946 2260 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 2261 } else {
2262 done_search = 1;
2263 }
2264 }
2265
b3b06a32 2266 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
8ca151b5
JB		 2267 /* If the "active" (non-search) mode was legacy,
2268 * and we've tried switching antennas,
2269 * but we haven't been able to try HT modes (not available),
2270 * stay with best antenna legacy modulation for a while
2271 * before next round of mode comparisons. */
2272 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
fd7dbee5 2273 if (is_legacy(&tbl1->rate)) {
8ca151b5 2274 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
fd7dbee5
ES		 2275
2276 if (tid != IWL_MAX_TID_COUNT) {
2277 tid_data = &sta_priv->tid_data[tid];
2278 if (tid_data->state != IWL_AGG_OFF) {
2279 IWL_DEBUG_RATE(mvm,
2280 "Stop aggregation on tid %d\n",
2281 tid);
2282 ieee80211_stop_tx_ba_session(sta, tid);
2283 }
2284 }
8ca151b5 2285 rs_set_stay_in_table(mvm, 1, lq_sta);
b3b06a32 2286 } else {
8ca151b5
JB		 2287 /* If we're in an HT mode, and all 3 mode switch actions
2288 * have been tried and compared, stay in this best modulation
2289 * mode for a while before next round of mode comparisons. */
8ca151b5
JB		 2290 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2291 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2292 (tid != IWL_MAX_TID_COUNT)) {
2293 tid_data = &sta_priv->tid_data[tid];
2294 if (tid_data->state == IWL_AGG_OFF) {
2295 IWL_DEBUG_RATE(mvm,
2296 "try to aggregate tid %d\n",
2297 tid);
2298 rs_tl_turn_on_agg(mvm, tid,
2299 lq_sta, sta);
2300 }
2301 }
2302 rs_set_stay_in_table(mvm, 0, lq_sta);
2303 }
2304 }
2305
2306out:
8ca151b5
JB		 2307 lq_sta->last_txrate_idx = index;
2308}
2309
361dbec8
ES		 2310struct rs_init_rate_info {
2311 s8 rssi;
2312 u8 rate_idx;
2313};
2314
2315static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2316 { -60, IWL_RATE_54M_INDEX },
2317 { -64, IWL_RATE_48M_INDEX },
2318 { -68, IWL_RATE_36M_INDEX },
2319 { -80, IWL_RATE_24M_INDEX },
2320 { -84, IWL_RATE_18M_INDEX },
2321 { -85, IWL_RATE_12M_INDEX },
2322 { -86, IWL_RATE_11M_INDEX },
2323 { -88, IWL_RATE_5M_INDEX },
2324 { -90, IWL_RATE_2M_INDEX },
2325 { S8_MIN, IWL_RATE_1M_INDEX },
2326};
2327
2328static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2329 { -60, IWL_RATE_54M_INDEX },
2330 { -64, IWL_RATE_48M_INDEX },
2331 { -72, IWL_RATE_36M_INDEX },
2332 { -80, IWL_RATE_24M_INDEX },
2333 { -84, IWL_RATE_18M_INDEX },
2334 { -85, IWL_RATE_12M_INDEX },
2335 { -87, IWL_RATE_9M_INDEX },
2336 { S8_MIN, IWL_RATE_6M_INDEX },
2337};
2338
2339/* Choose an initial legacy rate and antenna to use based on the RSSI
2340 * of last Rx
2341 */
2342static void rs_get_initial_rate(struct iwl_mvm *mvm,
2343 struct iwl_lq_sta *lq_sta,
2344 enum ieee80211_band band,
2345 struct rs_rate *rate)
2346{
2347 int i, nentries;
2348 s8 best_rssi = S8_MIN;
2349 u8 best_ant = ANT_NONE;
a0544272 2350 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
361dbec8
ES		 2351 const struct rs_init_rate_info *initial_rates;
2352
2353 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2354 if (!(lq_sta->pers.chains & BIT(i)))
2355 continue;
2356
2357 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2358 best_rssi = lq_sta->pers.chain_signal[i];
2359 best_ant = BIT(i);
2360 }
2361 }
2362
2363 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2364 rs_pretty_ant(best_ant), best_rssi);
2365
2366 if (best_ant != ANT_A && best_ant != ANT_B)
2367 rate->ant = first_antenna(valid_tx_ant);
2368 else
2369 rate->ant = best_ant;
2370
2371 rate->sgi = false;
2372 rate->ldpc = false;
2373 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2374
2375 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2376 BITS_PER_LONG);
2377
2378 if (band == IEEE80211_BAND_5GHZ) {
2379 rate->type = LQ_LEGACY_A;
2380 initial_rates = rs_init_rates_5ghz;
2381 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2382 } else {
2383 rate->type = LQ_LEGACY_G;
2384 initial_rates = rs_init_rates_24ghz;
2385 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2386 }
2387
2388 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2389 for (i = 0; i < nentries; i++) {
2390 int rate_idx = initial_rates[i].rate_idx;
2391 if ((best_rssi >= initial_rates[i].rssi) &&
2392 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2393 rate->index = rate_idx;
2394 break;
2395 }
2396 }
2397 }
2398
2399 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2400 rs_pretty_ant(rate->ant));
2401}
2402
2403/* Save info about RSSI of last Rx */
2404void rs_update_last_rssi(struct iwl_mvm *mvm,
2405 struct iwl_lq_sta *lq_sta,
2406 struct ieee80211_rx_status *rx_status)
2407{
2408 lq_sta->pers.chains = rx_status->chains;
2409 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2410 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2411 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2412}
2413
8ca151b5
JB		 2414/**
2415 * rs_initialize_lq - Initialize a station's hardware rate table
2416 *
2417 * The uCode's station table contains a table of fallback rates
2418 * for automatic fallback during transmission.
2419 *
2420 * NOTE: This sets up a default set of values. These will be replaced later
2421 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2422 * rc80211_simple.
2423 *
2424 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2425 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2426 * which requires station table entry to exist).
2427 */
2428static void rs_initialize_lq(struct iwl_mvm *mvm,
2429 struct ieee80211_sta *sta,
2430 struct iwl_lq_sta *lq_sta,
b87c2179
ES		 2431 enum ieee80211_band band,
2432 bool init)
8ca151b5
JB		 2433{
2434 struct iwl_scale_tbl_info *tbl;
5aa33553 2435 struct rs_rate *rate;
8ca151b5 2436 u8 active_tbl = 0;
8ca151b5
JB		 2437
2438 if (!sta || !lq_sta)
2439 return;
2440
8ca151b5
JB		 2441 if (!lq_sta->search_better_tbl)
2442 active_tbl = lq_sta->active_tbl;
2443 else
2444 active_tbl = 1 - lq_sta->active_tbl;
2445
2446 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2447 rate = &tbl->rate;
8ca151b5 2448
361dbec8
ES		 2449 rs_get_initial_rate(mvm, lq_sta, band, rate);
2450 lq_sta->last_txrate_idx = rate->index;
8ca151b5 2451
b3b06a32
ES		 2452 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2453 if (rate->ant == ANT_A)
2454 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2455 else
2456 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2457
8ca151b5 2458 rs_set_expected_tpt_table(lq_sta, tbl);
80e9e5cd 2459 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
8ca151b5 2460 /* TODO restore station should remember the lq cmd */
b87c2179 2461 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
8ca151b5
JB		 2462}
2463
2464static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2465 struct ieee80211_tx_rate_control *txrc)
2466{
2467 struct sk_buff *skb = txrc->skb;
8ca151b5
JB		 2468 struct iwl_op_mode *op_mode __maybe_unused =
2469 (struct iwl_op_mode *)mvm_r;
2470 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2471 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2472 struct iwl_lq_sta *lq_sta = mvm_sta;
8ca151b5 2473
2536e7c3 2474 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
8ca151b5
JB		 2475
2476 /* Treat uninitialized rate scaling data same as non-existing. */
ae969afe 2477 if (lq_sta && !lq_sta->pers.drv) {
8ca151b5
JB		 2478 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2479 mvm_sta = NULL;
2480 }
2481
2482 /* Send management frames and NO_ACK data using lowest rate. */
2483 if (rate_control_send_low(sta, mvm_sta, txrc))
2484 return;
2485
d310e405
ES		 2486 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2487 info->band, &info->control.rates[0]);
2488
622ebe99 2489 info->control.rates[0].count = 1;
8ca151b5
JB		 2490}
2491
2492static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2493 gfp_t gfp)
2494{
9d8ce6af 2495 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
ae969afe
EP		 2496 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2497 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2498 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
8ca151b5
JB		 2499
2500 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2501
ae969afe
EP		 2502 lq_sta->pers.drv = mvm;
2503#ifdef CONFIG_MAC80211_DEBUGFS
2504 lq_sta->pers.dbg_fixed_rate = 0;
2505 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2506#endif
361dbec8
ES		 2507 lq_sta->pers.chains = 0;
2508 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
ae969afe 2509
8ca151b5
JB		 2510 return &sta_priv->lq_sta;
2511}
2512
d310e405
ES		 2513static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2514 int nss)
2515{
2516 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2517 (0x3 << (2 * (nss - 1)));
2518 rx_mcs >>= (2 * (nss - 1));
2519
2520 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2521 return IWL_RATE_MCS_7_INDEX;
2522 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2523 return IWL_RATE_MCS_8_INDEX;
2524 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2525 return IWL_RATE_MCS_9_INDEX;
2526
2527 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2528 return -1;
2529}
2530
750a1b45
ES		 2531static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2532 struct ieee80211_sta_vht_cap *vht_cap,
2533 struct iwl_lq_sta *lq_sta)
2534{
2535 int i;
2536 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2537
2538 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2539 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2540 if (i == IWL_RATE_9M_INDEX)
2541 continue;
2542
271518ad
ES		 2543 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2544 if (i == IWL_RATE_MCS_9_INDEX &&
2545 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2546 continue;
2547
750a1b45
ES		 2548 lq_sta->active_siso_rate |= BIT(i);
2549 }
2550 }
2551
ecc90e79
ES		 2552 if (sta->rx_nss < 2)
2553 return;
2554
750a1b45
ES		 2555 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2556 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2557 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2558 if (i == IWL_RATE_9M_INDEX)
2559 continue;
2560
271518ad
ES		 2561 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2562 if (i == IWL_RATE_MCS_9_INDEX &&
2563 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2564 continue;
2565
750a1b45
ES		 2566 lq_sta->active_mimo2_rate |= BIT(i);
2567 }
2568 }
2569}
2570
2f15a829
JB		 2571static void rs_ht_init(struct iwl_mvm *mvm,
2572 struct ieee80211_sta *sta,
2573 struct iwl_lq_sta *lq_sta,
2574 struct ieee80211_sta_ht_cap *ht_cap)
2575{
2576 /* active_siso_rate mask includes 9 MBits (bit 5),
2577 * and CCK (bits 0-3), supp_rates[] does not;
2578 * shift to convert format, force 9 MBits off.
2579 */
2580 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2581 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2582 lq_sta->active_siso_rate &= ~((u16)0x2);
2583 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2584
2585 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2586 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2587 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2588 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2589
2590 if (mvm->cfg->ht_params->ldpc &&
2591 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2592 lq_sta->ldpc = true;
2593
2594 if (mvm->cfg->ht_params->stbc &&
2595 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2596 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3d44eebf 2597 lq_sta->stbc_capable = true;
2f15a829
JB		 2598
2599 lq_sta->is_vht = false;
2600}
2601
2602static void rs_vht_init(struct iwl_mvm *mvm,
2603 struct ieee80211_sta *sta,
2604 struct iwl_lq_sta *lq_sta,
2605 struct ieee80211_sta_vht_cap *vht_cap)
2606{
2607 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2608
2609 if (mvm->cfg->ht_params->ldpc &&
2610 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2611 lq_sta->ldpc = true;
2612
2613 if (mvm->cfg->ht_params->stbc &&
2614 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2615 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3d44eebf
ES		 2616 lq_sta->stbc_capable = true;
2617
2618 if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2619 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2620 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2621 lq_sta->bfer_capable = true;
2f15a829
JB		 2622
2623 lq_sta->is_vht = true;
2624}
2625
5fc0f76c 2626#ifdef CONFIG_IWLWIFI_DEBUGFS
2f15a829 2627static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
5fc0f76c
ES		 2628{
2629 spin_lock_bh(&mvm->drv_stats_lock);
2f15a829 2630 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
5fc0f76c
ES		 2631 spin_unlock_bh(&mvm->drv_stats_lock);
2632}
2633
2f15a829 2634void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
5fc0f76c
ES		 2635{
2636 u8 nss = 0, mcs = 0;
2637
2638 spin_lock(&mvm->drv_stats_lock);
2639
2640 if (agg)
2f15a829 2641 mvm->drv_rx_stats.agg_frames++;
5fc0f76c 2642
2f15a829 2643 mvm->drv_rx_stats.success_frames++;
5fc0f76c
ES		 2644
2645 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2646 case RATE_MCS_CHAN_WIDTH_20:
2f15a829 2647 mvm->drv_rx_stats.bw_20_frames++;
5fc0f76c
ES		 2648 break;
2649 case RATE_MCS_CHAN_WIDTH_40:
2f15a829 2650 mvm->drv_rx_stats.bw_40_frames++;
5fc0f76c
ES		 2651 break;
2652 case RATE_MCS_CHAN_WIDTH_80:
2f15a829 2653 mvm->drv_rx_stats.bw_80_frames++;
5fc0f76c
ES		 2654 break;
2655 default:
2656 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2657 }
2658
2659 if (rate & RATE_MCS_HT_MSK) {
2f15a829 2660 mvm->drv_rx_stats.ht_frames++;
5fc0f76c
ES		 2661 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2662 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2663 } else if (rate & RATE_MCS_VHT_MSK) {
2f15a829 2664 mvm->drv_rx_stats.vht_frames++;
5fc0f76c
ES		 2665 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2666 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2667 RATE_VHT_MCS_NSS_POS) + 1;
2668 } else {
2f15a829 2669 mvm->drv_rx_stats.legacy_frames++;
5fc0f76c
ES		 2670 }
2671
2672 if (nss == 1)
2f15a829 2673 mvm->drv_rx_stats.siso_frames++;
5fc0f76c 2674 else if (nss == 2)
2f15a829 2675 mvm->drv_rx_stats.mimo2_frames++;
5fc0f76c
ES		 2676
2677 if (rate & RATE_MCS_SGI_MSK)
2f15a829 2678 mvm->drv_rx_stats.sgi_frames++;
5fc0f76c 2679 else
2f15a829 2680 mvm->drv_rx_stats.ngi_frames++;
5fc0f76c 2681
2f15a829
JB		 2682 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2683 mvm->drv_rx_stats.last_frame_idx =
2684 (mvm->drv_rx_stats.last_frame_idx + 1) %
2685 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
5fc0f76c
ES		 2686
2687 spin_unlock(&mvm->drv_stats_lock);
2688}
2689#endif
2690
8ca151b5
JB		 2691/*
2692 * Called after adding a new station to initialize rate scaling
2693 */
2694void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
b87c2179 2695 enum ieee80211_band band, bool init)
8ca151b5
JB		 2696{
2697 int i, j;
2698 struct ieee80211_hw *hw = mvm->hw;
2699 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
d310e405 2700 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
9d8ce6af
JB		 2701 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2702 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
8ca151b5
JB		 2703 struct ieee80211_supported_band *sband;
2704 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2705
ae969afe
EP		 2706 /* clear all non-persistent lq data */
2707 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
b87c2179 2708
8ca151b5
JB		 2709 sband = hw->wiphy->bands[band];
2710
2711 lq_sta->lq.sta_id = sta_priv->sta_id;
2712
2713 for (j = 0; j < LQ_SIZE; j++)
b804eeb6 2714 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
8ca151b5
JB		 2715
2716 lq_sta->flush_timer = 0;
87d5e415 2717 lq_sta->last_tx = jiffies;
8ca151b5
JB		 2718
2719 IWL_DEBUG_RATE(mvm,
2720 "LQ: *** rate scale station global init for station %d ***\n",
2721 sta_priv->sta_id);
2722 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2723 * the lowest or the highest rate.. Could consider using RSSI from
2724 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2725 * after assoc.. */
2726
834437da 2727 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
8ca151b5
JB		 2728 lq_sta->band = sband->band;
2729 /*
2730 * active legacy rates as per supported rates bitmap
2731 */
2732 supp = sta->supp_rates[sband->band];
2733 lq_sta->active_legacy_rate = 0;
2734 for_each_set_bit(i, &supp, BITS_PER_LONG)
2735 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2736
d310e405 2737 /* TODO: should probably account for rx_highest for both HT/VHT */
2c59d80c
ES		 2738 if (!vht_cap || !vht_cap->vht_supported)
2739 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2740 else
2741 rs_vht_init(mvm, sta, lq_sta, vht_cap);
8ca151b5 2742
afe08e1c 2743 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
dc574e52
ES		 2744 lq_sta->active_mimo2_rate = 0;
2745
6a028d9a
ES		 2746 lq_sta->max_legacy_rate_idx =
2747 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2748 lq_sta->max_siso_rate_idx =
2749 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2750 lq_sta->max_mimo2_rate_idx =
2751 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
198266a3 2752
a3576ff2 2753 IWL_DEBUG_RATE(mvm,
3d44eebf 2754 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
198266a3 2755 lq_sta->active_legacy_rate,
8ca151b5 2756 lq_sta->active_siso_rate,
d310e405 2757 lq_sta->active_mimo2_rate,
3d44eebf
ES		 2758 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2759 lq_sta->bfer_capable);
198266a3
ES		 2760 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2761 lq_sta->max_legacy_rate_idx,
2762 lq_sta->max_siso_rate_idx,
2763 lq_sta->max_mimo2_rate_idx);
8ca151b5
JB		 2764
2765 /* These values will be overridden later */
2766 lq_sta->lq.single_stream_ant_msk =
a0544272 2767 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
809bccfa 2768 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
8ca151b5
JB		 2769
2770 /* as default allow aggregation for all tids */
2771 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
8ca151b5 2772 lq_sta->is_agg = 0;
5fc0f76c 2773#ifdef CONFIG_IWLWIFI_DEBUGFS
2f15a829 2774 iwl_mvm_reset_frame_stats(mvm);
5fc0f76c 2775#endif
b87c2179
ES		 2776 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2777}
2778
2779static void rs_rate_update(void *mvm_r,
2780 struct ieee80211_supported_band *sband,
2781 struct cfg80211_chan_def *chandef,
2782 struct ieee80211_sta *sta, void *priv_sta,
2783 u32 changed)
2784{
2785 u8 tid;
2786 struct iwl_op_mode *op_mode =
2787 (struct iwl_op_mode *)mvm_r;
2788 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2789
2790 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2791 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2792 ieee80211_stop_tx_ba_session(sta, tid);
2793
2794 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
8ca151b5
JB		 2795}
2796
8fc7c58c
ES		 2797#ifdef CONFIG_MAC80211_DEBUGFS
2798static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2799 struct iwl_lq_cmd *lq_cmd,
2800 enum ieee80211_band band,
2801 u32 ucode_rate)
2802{
2803 struct rs_rate rate;
2804 int i;
2805 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2806 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
7ceb98a3 2807 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
8fc7c58c
ES		 2808
2809 for (i = 0; i < num_rates; i++)
2810 lq_cmd->rs_table[i] = ucode_rate_le32;
2811
2812 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2813
2814 if (is_mimo(&rate))
2815 lq_cmd->mimo_delim = num_rates - 1;
2816 else
2817 lq_cmd->mimo_delim = 0;
7ceb98a3
EG		 2818
2819 lq_cmd->reduced_tpc = 0;
2820
2821 if (num_of_ant(ant) == 1)
2822 lq_cmd->single_stream_ant_msk = ant;
2823
2824 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
8fc7c58c
ES		 2825}
2826#endif /* CONFIG_MAC80211_DEBUGFS */
2827
e07be6d3
ES		 2828static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2829 struct iwl_lq_sta *lq_sta,
2830 struct rs_rate *rate,
2831 __le32 *rs_table, int *rs_table_index,
2832 int num_rates, int num_retries,
2833 u8 valid_tx_ant, bool toggle_ant)
2834{
2835 int i, j;
2836 __le32 ucode_rate;
2837 bool bottom_reached = false;
2838 int prev_rate_idx = rate->index;
2839 int end = LINK_QUAL_MAX_RETRY_NUM;
2840 int index = *rs_table_index;
2841
2842 for (i = 0; i < num_rates && index < end; i++) {
bd999318
ES		 2843 for (j = 0; j < num_retries && index < end; j++, index++) {
2844 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2845 rate));
e07be6d3 2846 rs_table[index] = ucode_rate;
bd999318
ES		 2847 if (toggle_ant)
2848 rs_toggle_antenna(valid_tx_ant, rate);
2849 }
e07be6d3
ES		 2850
2851 prev_rate_idx = rate->index;
2852 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2853 if (bottom_reached && !is_legacy(rate))
2854 break;
2855 }
2856
bd999318 2857 if (!bottom_reached && !is_legacy(rate))
e07be6d3
ES		 2858 rate->index = prev_rate_idx;
2859
2860 *rs_table_index = index;
2861}
2862
2863/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2864 * column the rate table should look like this:
2865 *
2866 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2867 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2868 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2869 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2870 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2871 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2872 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2873 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2874 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2875 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2876 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2877 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2878 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2879 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2880 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2881 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2882 */
8fc7c58c 2883static void rs_build_rates_table(struct iwl_mvm *mvm,
d8bafeaf 2884 struct ieee80211_sta *sta,
8fc7c58c
ES		 2885 struct iwl_lq_sta *lq_sta,
2886 const struct rs_rate *initial_rate)
8ca151b5 2887{
5aa33553 2888 struct rs_rate rate;
e07be6d3 2889 int num_rates, num_retries, index = 0;
8ca151b5
JB		 2890 u8 valid_tx_ant = 0;
2891 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
e07be6d3 2892 bool toggle_ant = false;
8ca151b5 2893
9e898f1b 2894 memcpy(&rate, initial_rate, sizeof(rate));
8fc7c58c 2895
a0544272 2896 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
c5d679a5 2897
3d44eebf
ES		 2898 /* TODO: remove old API when min FW API hits 14 */
2899 if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
2900 rs_stbc_allow(mvm, sta, lq_sta))
2901 rate.stbc = true;
8ca151b5 2902
e07be6d3 2903 if (is_siso(&rate)) {
834437da
ES		 2904 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2905 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
e07be6d3 2906 } else if (is_mimo(&rate)) {
834437da
ES		 2907 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2908 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
8ca151b5 2909 } else {
834437da 2910 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
bd999318 2911 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
e07be6d3 2912 toggle_ant = true;
8ca151b5
JB		 2913 }
2914
e07be6d3
ES		 2915 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2916 num_rates, num_retries, valid_tx_ant,
2917 toggle_ant);
8ca151b5 2918
e07be6d3 2919 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 2920
e07be6d3 2921 if (is_siso(&rate)) {
834437da
ES		 2922 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2923 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
d9088f60 2924 lq_cmd->mimo_delim = index;
e07be6d3 2925 } else if (is_legacy(&rate)) {
834437da 2926 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
bd999318 2927 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
e07be6d3
ES		 2928 } else {
2929 WARN_ON_ONCE(1);
2930 }
8ca151b5 2931
e07be6d3 2932 toggle_ant = true;
8ca151b5 2933
e07be6d3
ES		 2934 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2935 num_rates, num_retries, valid_tx_ant,
2936 toggle_ant);
8ca151b5 2937
e07be6d3 2938 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 2939
834437da 2940 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
bd999318 2941 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
8ca151b5 2942
e07be6d3
ES		 2943 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2944 num_rates, num_retries, valid_tx_ant,
2945 toggle_ant);
8ca151b5 2946
8fc7c58c
ES		 2947}
2948
3d44eebf
ES		 2949struct rs_bfer_active_iter_data {
2950 struct ieee80211_sta *exclude_sta;
2951 struct iwl_mvm_sta *bfer_mvmsta;
2952};
2953
2954static void rs_bfer_active_iter(void *_data,
2955 struct ieee80211_sta *sta)
2956{
2957 struct rs_bfer_active_iter_data *data = _data;
2958 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2959 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
2960 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
2961
2962 if (sta == data->exclude_sta)
2963 return;
2964
2965 /* The current sta has BFER allowed */
2966 if (ss_params & LQ_SS_BFER_ALLOWED) {
2967 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
2968
2969 data->bfer_mvmsta = mvmsta;
2970 }
2971}
2972
2973static int rs_bfer_priority(struct iwl_mvm_sta *sta)
2974{
2975 int prio = -1;
2976 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
2977
2978 switch (viftype) {
2979 case NL80211_IFTYPE_AP:
2980 case NL80211_IFTYPE_P2P_GO:
2981 prio = 3;
2982 break;
2983 case NL80211_IFTYPE_P2P_CLIENT:
2984 prio = 2;
2985 break;
2986 case NL80211_IFTYPE_STATION:
2987 prio = 1;
2988 break;
2989 default:
2990 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
2991 prio = -1;
2992 }
2993
2994 return prio;
2995}
2996
2997/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
2998static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
2999 struct iwl_mvm_sta *sta2)
3000{
3001 int prio1 = rs_bfer_priority(sta1);
3002 int prio2 = rs_bfer_priority(sta2);
3003
3004 if (prio1 > prio2)
3005 return 1;
3006 if (prio1 < prio2)
3007 return -1;
3008 return 0;
3009}
3010
3011static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3012 struct ieee80211_sta *sta,
3013 struct iwl_lq_sta *lq_sta,
3014 const struct rs_rate *initial_rate)
3015{
3016 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3017 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3018 struct rs_bfer_active_iter_data data = {
3019 .exclude_sta = sta,
3020 .bfer_mvmsta = NULL,
3021 };
3022 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3023 u32 ss_params = LQ_SS_PARAMS_VALID;
3024
3025 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3026 goto out;
3027
1e9c62fa
ES		 3028 /* Check if forcing the decision is configured.
3029 * Note that SISO is forced by not allowing STBC or BFER
3030 */
3031 if (lq_sta->ss_force == RS_SS_FORCE_STBC)
3032 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3033 else if (lq_sta->ss_force == RS_SS_FORCE_BFER)
3034 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3035
3036 if (lq_sta->ss_force != RS_SS_FORCE_NONE) {
3037 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3038 lq_sta->ss_force);
3039 goto out;
3040 }
3041
3d44eebf
ES		 3042 if (lq_sta->stbc_capable)
3043 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3044
3045 if (!lq_sta->bfer_capable)
3046 goto out;
3047
3048 ieee80211_iterate_stations_atomic(mvm->hw,
3049 rs_bfer_active_iter,
3050 &data);
3051 bfer_mvmsta = data.bfer_mvmsta;
3052
3053 /* This code is safe as it doesn't run concurrently for different
3054 * stations. This is guaranteed by the fact that calls to
3055 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3056 */
3057 if (!bfer_mvmsta) {
3058 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3059
3060 ss_params |= LQ_SS_BFER_ALLOWED;
3061 goto out;
3062 }
3063
3064 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3065 bfer_mvmsta->sta_id);
3066
3067 /* Disallow BFER on another STA if active and we're a higher priority */
3068 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3069 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3070 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3071
3072 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3073 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3074 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3075
3076 ss_params |= LQ_SS_BFER_ALLOWED;
3077 IWL_DEBUG_RATE(mvm,
3078 "Lower priority BFER sta found (%d). Switch BFER\n",
3079 bfer_mvmsta->sta_id);
3080 }
3081out:
3082 lq_cmd->ss_params = cpu_to_le32(ss_params);
3083}
3084
8fc7c58c
ES		 3085static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3086 struct ieee80211_sta *sta,
3087 struct iwl_lq_sta *lq_sta,
3088 const struct rs_rate *initial_rate)
3089{
3090 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
7ceb98a3
EG		 3091 struct iwl_mvm_sta *mvmsta;
3092 struct iwl_mvm_vif *mvmvif;
3093
834437da 3094 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
7ceb98a3 3095 lq_cmd->agg_time_limit =
834437da 3096 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
8fc7c58c
ES		 3097
3098#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 3099 if (lq_sta->pers.dbg_fixed_rate) {
8fc7c58c
ES		 3100 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3101 lq_sta->band,
ae969afe 3102 lq_sta->pers.dbg_fixed_rate);
7ceb98a3
EG		 3103 return;
3104 }
8fc7c58c 3105#endif
7ceb98a3
EG		 3106 if (WARN_ON_ONCE(!sta || !initial_rate))
3107 return;
8fc7c58c 3108
d8bafeaf 3109 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
8ca151b5 3110
3d44eebf
ES		 3111 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3112 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3113
7ceb98a3
EG		 3114 if (num_of_ant(initial_rate->ant) == 1)
3115 lq_cmd->single_stream_ant_msk = initial_rate->ant;
8ca151b5 3116
7ceb98a3
EG		 3117 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3118 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
e96d551f 3119
7ceb98a3
EG		 3120 if (num_of_ant(initial_rate->ant) == 1)
3121 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3122
3123 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3124
3125 /*
3126 * In case of low latency, tell the firwmare to leave a frame in the
3127 * Tx Fifo so that it can start a transaction in the same TxOP. This
3128 * basically allows the firmware to send bursts.
3129 */
9ecd051e 3130 if (iwl_mvm_vif_low_latency(mvmvif)) {
7ceb98a3
EG		 3131 lq_cmd->agg_frame_cnt_limit--;
3132
9ecd051e
ES		 3133 if (mvm->low_latency_agg_frame_limit)
3134 lq_cmd->agg_frame_cnt_limit =
3135 min(lq_cmd->agg_frame_cnt_limit,
3136 mvm->low_latency_agg_frame_limit);
3137 }
3138
a4db848f
EG		 3139 if (mvmsta->vif->p2p)
3140 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3141
7ceb98a3 3142 lq_cmd->agg_time_limit =
5b7ff615 3143 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
8ca151b5
JB		 3144}
3145
3146static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3147{
3148 return hw->priv;
3149}
3150/* rate scale requires free function to be implemented */
3151static void rs_free(void *mvm_rate)
3152{
3153 return;
3154}
3155
3156static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3157 void *mvm_sta)
3158{
3159 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3160 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3161
3162 IWL_DEBUG_RATE(mvm, "enter\n");
3163 IWL_DEBUG_RATE(mvm, "leave\n");
3164}
3165
3166#ifdef CONFIG_MAC80211_DEBUGFS
5fc0f76c 3167int rs_pretty_print_rate(char *buf, const u32 rate)
5aa33553
ES		 3168{
3169
1a61b347
ES		 3170 char *type, *bw;
3171 u8 mcs = 0, nss = 0;
3172 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3173
3174 if (!(rate & RATE_MCS_HT_MSK) &&
3175 !(rate & RATE_MCS_VHT_MSK)) {
3176 int index = iwl_hwrate_to_plcp_idx(rate);
3177
3178 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
560843f4
ES		 3179 rs_pretty_ant(ant),
3180 index == IWL_RATE_INVALID ? "BAD" :
3181 iwl_rate_mcs[index].mbps);
1a61b347
ES		 3182 }
3183
3184 if (rate & RATE_MCS_VHT_MSK) {
3185 type = "VHT";
3186 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3187 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3188 >> RATE_VHT_MCS_NSS_POS) + 1;
3189 } else if (rate & RATE_MCS_HT_MSK) {
3190 type = "HT";
3191 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3192 } else {
3193 type = "Unknown"; /* shouldn't happen */
3194 }
3195
3196 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3197 case RATE_MCS_CHAN_WIDTH_20:
3198 bw = "20Mhz";
3199 break;
3200 case RATE_MCS_CHAN_WIDTH_40:
3201 bw = "40Mhz";
3202 break;
3203 case RATE_MCS_CHAN_WIDTH_80:
3204 bw = "80Mhz";
3205 break;
3206 case RATE_MCS_CHAN_WIDTH_160:
3207 bw = "160Mhz";
3208 break;
3209 default:
3210 bw = "BAD BW";
3211 }
3212
3213 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
5aa33553 3214 type, rs_pretty_ant(ant), bw, mcs, nss,
1a61b347 3215 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
7b1dd048 3216 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
1a61b347
ES		 3217 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3218 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3219 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3220}
3221
a0c38b21
ES		 3222/**
3223 * Program the device to use fixed rate for frame transmit
3224 * This is for debugging/testing only
3225 * once the device start use fixed rate, we need to reload the module
3226 * to being back the normal operation.
3227 */
3228static void rs_program_fix_rate(struct iwl_mvm *mvm,
3229 struct iwl_lq_sta *lq_sta)
3230{
3231 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3232 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3233 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3234
3235 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
ae969afe 3236 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
a0c38b21 3237
ae969afe 3238 if (lq_sta->pers.dbg_fixed_rate) {
7ceb98a3 3239 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
ae969afe 3240 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
a0c38b21
ES		 3241 }
3242}
3243
9d10849e
EG		 3244static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3245 const char __user *user_buf, size_t count, loff_t *ppos)
3246{
3247 struct iwl_lq_sta *lq_sta = file->private_data;
3248 struct iwl_mvm *mvm;
3249 char buf[64];
3250 size_t buf_size;
3251 u32 parsed_rate;
3252
ae969afe 3253 mvm = lq_sta->pers.drv;
9d10849e
EG		 3254 memset(buf, 0, sizeof(buf));
3255 buf_size = min(count, sizeof(buf) - 1);
3256 if (copy_from_user(buf, user_buf, buf_size))
3257 return -EFAULT;
3258
3259 if (sscanf(buf, "%x", &parsed_rate) == 1)
ae969afe 3260 lq_sta->pers.dbg_fixed_rate = parsed_rate;
9d10849e 3261 else
ae969afe 3262 lq_sta->pers.dbg_fixed_rate = 0;
9d10849e
EG		 3263
3264 rs_program_fix_rate(mvm, lq_sta);
3265
3266 return count;
3267}
3268
8ca151b5
JB		 3269static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3270 char __user *user_buf, size_t count, loff_t *ppos)
3271{
3272 char *buff;
3273 int desc = 0;
3274 int i = 0;
8ca151b5
JB		 3275 ssize_t ret;
3276
3277 struct iwl_lq_sta *lq_sta = file->private_data;
3278 struct iwl_mvm *mvm;
3279 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 3280 struct rs_rate *rate = &tbl->rate;
ae969afe 3281 mvm = lq_sta->pers.drv;
1a61b347 3282 buff = kmalloc(2048, GFP_KERNEL);
8ca151b5
JB		 3283 if (!buff)
3284 return -ENOMEM;
3285
3286 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
198266a3 3287 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
8ca151b5
JB		 3288 lq_sta->total_failed, lq_sta->total_success,
3289 lq_sta->active_legacy_rate);
3290 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
ae969afe 3291 lq_sta->pers.dbg_fixed_rate);
8ca151b5 3292 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
a0544272
MH		 3293 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3294 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3295 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
8ca151b5 3296 desc += sprintf(buff+desc, "lq type %s\n",
5aa33553
ES		 3297 (is_legacy(rate)) ? "legacy" :
3298 is_vht(rate) ? "VHT" : "HT");
3299 if (!is_legacy(rate)) {
8ca151b5 3300 desc += sprintf(buff+desc, " %s",
5aa33553 3301 (is_siso(rate)) ? "SISO" : "MIMO2");
8ca151b5 3302 desc += sprintf(buff+desc, " %s",
5aa33553
ES		 3303 (is_ht20(rate)) ? "20MHz" :
3304 (is_ht40(rate)) ? "40MHz" :
3305 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
a3576ff2 3306 desc += sprintf(buff+desc, " %s %s %s\n",
5aa33553 3307 (rate->sgi) ? "SGI" : "NGI",
a3576ff2 3308 (rate->ldpc) ? "LDPC" : "BCC",
6a524f48 3309 (lq_sta->is_agg) ? "AGG on" : "");
8ca151b5
JB		 3310 }
3311 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3312 lq_sta->last_rate_n_flags);
3313 desc += sprintf(buff+desc,
1a61b347 3314 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
8ca151b5
JB		 3315 lq_sta->lq.flags,
3316 lq_sta->lq.mimo_delim,
3317 lq_sta->lq.single_stream_ant_msk,
3318 lq_sta->lq.dual_stream_ant_msk);
3319
3320 desc += sprintf(buff+desc,
3321 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3322 le16_to_cpu(lq_sta->lq.agg_time_limit),
3323 lq_sta->lq.agg_disable_start_th,
3324 lq_sta->lq.agg_frame_cnt_limit);
3325
2fd647f8 3326 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
8ca151b5
JB		 3327 desc += sprintf(buff+desc,
3328 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3329 lq_sta->lq.initial_rate_index[0],
3330 lq_sta->lq.initial_rate_index[1],
3331 lq_sta->lq.initial_rate_index[2],
3332 lq_sta->lq.initial_rate_index[3]);
3333
3334 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
cf4ef654 3335 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
1a61b347 3336
cf4ef654
JB		 3337 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3338 desc += rs_pretty_print_rate(buff+desc, r);
8ca151b5
JB		 3339 }
3340
3341 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3342 kfree(buff);
3343 return ret;
3344}
3345
3346static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3347 .write = rs_sta_dbgfs_scale_table_write,
3348 .read = rs_sta_dbgfs_scale_table_read,
3349 .open = simple_open,
3350 .llseek = default_llseek,
3351};
3352static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3353 char __user *user_buf, size_t count, loff_t *ppos)
3354{
3355 char *buff;
3356 int desc = 0;
3357 int i, j;
3358 ssize_t ret;
d310e405 3359 struct iwl_scale_tbl_info *tbl;
5aa33553 3360 struct rs_rate *rate;
8ca151b5
JB		 3361 struct iwl_lq_sta *lq_sta = file->private_data;
3362
3363 buff = kmalloc(1024, GFP_KERNEL);
3364 if (!buff)
3365 return -ENOMEM;
3366
3367 for (i = 0; i < LQ_SIZE; i++) {
d310e405 3368 tbl = &(lq_sta->lq_info[i]);
5aa33553 3369 rate = &tbl->rate;
8ca151b5 3370 desc += sprintf(buff+desc,
6a524f48 3371 "%s type=%d SGI=%d BW=%s DUP=0\n"
8fc7c58c 3372 "index=%d\n",
8ca151b5 3373 lq_sta->active_tbl == i ? "*" : "x",
5aa33553
ES		 3374 rate->type,
3375 rate->sgi,
3376 is_ht20(rate) ? "20Mhz" :
3377 is_ht40(rate) ? "40Mhz" :
3378 is_ht80(rate) ? "80Mhz" : "ERR",
8fc7c58c 3379 rate->index);
8ca151b5
JB		 3380 for (j = 0; j < IWL_RATE_COUNT; j++) {
3381 desc += sprintf(buff+desc,
3382 "counter=%d success=%d %%=%d\n",
d310e405
ES		 3383 tbl->win[j].counter,
3384 tbl->win[j].success_counter,
3385 tbl->win[j].success_ratio);
8ca151b5
JB		 3386 }
3387 }
3388 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3389 kfree(buff);
3390 return ret;
3391}
3392
3393static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3394 .read = rs_sta_dbgfs_stats_table_read,
3395 .open = simple_open,
3396 .llseek = default_llseek,
3397};
3398
757cf23b
ES		 3399static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3400 char __user *user_buf,
3401 size_t count, loff_t *ppos)
3402{
3403 static const char * const column_name[] = {
3404 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3405 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3406 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3407 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3408 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3409 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3410 [RS_COLUMN_MIMO2] = "MIMO2",
3411 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3412 };
3413
3414 static const char * const rate_name[] = {
3415 [IWL_RATE_1M_INDEX] = "1M",
3416 [IWL_RATE_2M_INDEX] = "2M",
3417 [IWL_RATE_5M_INDEX] = "5.5M",
3418 [IWL_RATE_11M_INDEX] = "11M",
3419 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3420 [IWL_RATE_9M_INDEX] = "9M",
3421 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3422 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3423 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3424 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3425 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3426 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3427 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3428 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3429 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3430 };
3431
3432 char *buff, *pos, *endpos;
3433 int col, rate;
3434 ssize_t ret;
3435 struct iwl_lq_sta *lq_sta = file->private_data;
3436 struct rs_rate_stats *stats;
3437 static const size_t bufsz = 1024;
3438
3439 buff = kmalloc(bufsz, GFP_KERNEL);
3440 if (!buff)
3441 return -ENOMEM;
3442
3443 pos = buff;
3444 endpos = pos + bufsz;
3445
3446 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3447 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3448 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3449 pos += scnprintf(pos, endpos - pos, "\n");
3450
3451 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3452 pos += scnprintf(pos, endpos - pos,
3453 "%s,", column_name[col]);
3454
3455 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
f58220f6 3456 stats = &(lq_sta->pers.tx_stats[col][rate]);
757cf23b
ES		 3457 pos += scnprintf(pos, endpos - pos,
3458 "%llu/%llu,",
3459 stats->success,
3460 stats->total);
3461 }
3462 pos += scnprintf(pos, endpos - pos, "\n");
3463 }
3464
3465 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3466 kfree(buff);
3467 return ret;
3468}
3469
3470static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3471 const char __user *user_buf,
3472 size_t count, loff_t *ppos)
3473{
3474 struct iwl_lq_sta *lq_sta = file->private_data;
f58220f6 3475 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
757cf23b
ES		 3476
3477 return count;
3478}
3479
3480static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3481 .read = rs_sta_dbgfs_drv_tx_stats_read,
3482 .write = rs_sta_dbgfs_drv_tx_stats_write,
3483 .open = simple_open,
3484 .llseek = default_llseek,
3485};
3486
1e9c62fa
ES		 3487static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3488 char __user *user_buf,
3489 size_t count, loff_t *ppos)
3490{
3491 struct iwl_lq_sta *lq_sta = file->private_data;
3492 char buf[12];
3493 int bufsz = sizeof(buf);
3494 int pos = 0;
3495 static const char * const ss_force_name[] = {
3496 [RS_SS_FORCE_NONE] = "none",
3497 [RS_SS_FORCE_STBC] = "stbc",
3498 [RS_SS_FORCE_BFER] = "bfer",
3499 [RS_SS_FORCE_SISO] = "siso",
3500 };
3501
3502 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3503 ss_force_name[lq_sta->ss_force]);
3504 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3505}
3506
3507static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3508 size_t count, loff_t *ppos)
3509{
3510 struct iwl_mvm *mvm = lq_sta->pers.drv;
3511 int ret = 0;
3512
3513 if (!strncmp("none", buf, 4)) {
3514 lq_sta->ss_force = RS_SS_FORCE_NONE;
3515 } else if (!strncmp("siso", buf, 4)) {
3516 lq_sta->ss_force = RS_SS_FORCE_SISO;
3517 } else if (!strncmp("stbc", buf, 4)) {
3518 if (lq_sta->stbc_capable) {
3519 lq_sta->ss_force = RS_SS_FORCE_STBC;
3520 } else {
3521 IWL_ERR(mvm,
3522 "can't force STBC. peer doesn't support\n");
3523 ret = -EINVAL;
3524 }
3525 } else if (!strncmp("bfer", buf, 4)) {
3526 if (lq_sta->bfer_capable) {
3527 lq_sta->ss_force = RS_SS_FORCE_BFER;
3528 } else {
3529 IWL_ERR(mvm,
3530 "can't force BFER. peer doesn't support\n");
3531 ret = -EINVAL;
3532 }
3533 } else {
3534 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3535 ret = -EINVAL;
3536 }
3537 return ret ?: count;
3538}
3539
3540#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3541 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3542#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3543 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3544 &iwl_dbgfs_##name##_ops)) \
3545 goto err; \
3546 } while (0)
3547
3548MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3549
8ca151b5
JB		 3550static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3551{
3552 struct iwl_lq_sta *lq_sta = mvm_sta;
1e9c62fa 3553
c6e1faad
EP		 3554 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3555 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3556 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3557 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3558 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3559 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3560 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3561 &lq_sta->tx_agg_tid_en);
3562 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3563 &lq_sta->pers.dbg_fixed_txp_reduction);
1e9c62fa
ES		 3564
3565 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3566 return;
3567err:
3568 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
8ca151b5
JB		 3569}
3570
3571static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3572{
8ca151b5
JB		 3573}
3574#endif
3575
3576/*
3577 * Initialization of rate scaling information is done by driver after
3578 * the station is added. Since mac80211 calls this function before a
3579 * station is added we ignore it.
3580 */
3581static void rs_rate_init_stub(void *mvm_r,
3de805cf
SW		 3582 struct ieee80211_supported_band *sband,
3583 struct cfg80211_chan_def *chandef,
3584 struct ieee80211_sta *sta, void *mvm_sta)
8ca151b5
JB		 3585{
3586}
631ad703
JB		 3587
3588static const struct rate_control_ops rs_mvm_ops = {
8ca151b5 3589 .name = RS_NAME,
1ebc8f2e 3590 .tx_status = rs_mac80211_tx_status,
8ca151b5
JB		 3591 .get_rate = rs_get_rate,
3592 .rate_init = rs_rate_init_stub,
3593 .alloc = rs_alloc,
3594 .free = rs_free,
3595 .alloc_sta = rs_alloc_sta,
3596 .free_sta = rs_free_sta,
b87c2179 3597 .rate_update = rs_rate_update,
8ca151b5
JB		 3598#ifdef CONFIG_MAC80211_DEBUGFS
3599 .add_sta_debugfs = rs_add_debugfs,
3600 .remove_sta_debugfs = rs_remove_debugfs,
3601#endif
3602};
3603
3604int iwl_mvm_rate_control_register(void)
3605{
3606 return ieee80211_rate_control_register(&rs_mvm_ops);
3607}
3608
3609void iwl_mvm_rate_control_unregister(void)
3610{
3611 ieee80211_rate_control_unregister(&rs_mvm_ops);
3612}
9ee718aa
EL		 3613
3614/**
3615 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3616 * Tx protection, according to this rquest and previous requests,
3617 * and send the LQ command.
9ee718aa
EL		 3618 * @mvmsta: The station
3619 * @enable: Enable Tx protection?
3620 */
e126b5d9
JB		 3621int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3622 bool enable)
9ee718aa 3623{
e126b5d9
JB		 3624 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3625
9ee718aa
EL		 3626 lockdep_assert_held(&mvm->mutex);
3627
3628 if (enable) {
3629 if (mvmsta->tx_protection == 0)
d307ec8d 3630 lq->flags |= LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 3631 mvmsta->tx_protection++;
3632 } else {
3633 mvmsta->tx_protection--;
3634 if (mvmsta->tx_protection == 0)
d307ec8d 3635 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 3636 }
3637
9e680946 3638 return iwl_mvm_send_lq_cmd(mvm, lq, false);
9ee718aa 3639}
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