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iwlwifi: rs: split rs_collect_tx_data
[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.
8ca151b5
JB		 4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26#include <linux/kernel.h>
8ca151b5
JB		 27#include <linux/skbuff.h>
28#include <linux/slab.h>
29#include <net/mac80211.h>
30
31#include <linux/netdevice.h>
32#include <linux/etherdevice.h>
33#include <linux/delay.h>
34
35#include <linux/workqueue.h>
36#include "rs.h"
37#include "fw-api.h"
38#include "sta.h"
39#include "iwl-op-mode.h"
40#include "mvm.h"
41
42#define RS_NAME "iwl-mvm-rs"
43
e07be6d3
ES		 44#define NUM_TRY_BEFORE_ANT_TOGGLE 1
45#define RS_LEGACY_RETRIES_PER_RATE 1
46#define RS_HT_VHT_RETRIES_PER_RATE 2
47#define RS_HT_VHT_RETRIES_PER_RATE_TW 1
48#define RS_INITIAL_MIMO_NUM_RATES 3
49#define RS_INITIAL_SISO_NUM_RATES 3
50#define RS_INITIAL_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM
51#define RS_SECONDARY_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM
52#define RS_SECONDARY_SISO_NUM_RATES 3
53#define RS_SECONDARY_SISO_RETRIES 1
8ca151b5
JB		 54
55#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
d17334c4 56#define IWL_RATE_MIN_FAILURE_TH 3 /* min failures to calc tpt */
8ca151b5
JB		 57#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
58
59/* max allowed rate miss before sync LQ cmd */
60#define IWL_MISSED_RATE_MAX 15
32b01726
ES		 61#define RS_STAY_IN_COLUMN_TIMEOUT (5*HZ)
62
8ca151b5
JB		 63
64static u8 rs_ht_to_legacy[] = {
da87d7d5
ES		 65 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
66 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
67 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
68 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
69 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
70 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
71 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
72 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
73 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
74 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
8ca151b5
JB		 75};
76
77static const u8 ant_toggle_lookup[] = {
ef4394b9
EP		 78 [ANT_NONE] = ANT_NONE,
79 [ANT_A] = ANT_B,
80 [ANT_B] = ANT_C,
81 [ANT_AB] = ANT_BC,
82 [ANT_C] = ANT_A,
83 [ANT_AC] = ANT_AB,
84 [ANT_BC] = ANT_AC,
85 [ANT_ABC] = ANT_ABC,
8ca151b5
JB		 86};
87
d310e405
ES		 88#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
89 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
90 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
93 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
94 IWL_RATE_##rp##M_INDEX, \
ab055ce9 95 IWL_RATE_##rn##M_INDEX }
8ca151b5 96
d310e405
ES		 97#define IWL_DECLARE_MCS_RATE(s) \
98 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
99 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
100 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
101 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
102 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
103 IWL_RATE_INVM_INDEX, \
104 IWL_RATE_INVM_INDEX }
105
8ca151b5
JB		 106/*
107 * Parameter order:
ab055ce9 108 * rate, ht rate, prev rate, next rate
8ca151b5
JB		 109 *
110 * If there isn't a valid next or previous rate then INV is used which
111 * maps to IWL_RATE_INVALID
112 *
113 */
114static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
ab055ce9
ES		 115 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
116 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
117 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
118 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
d310e405
ES		 119 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
120 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
121 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
122 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
123 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
124 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
125 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
126 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
127 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
128 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
129 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
8ca151b5
JB		 130};
131
4e4b815c
ES		 132enum rs_action {
133 RS_ACTION_STAY = 0,
134 RS_ACTION_DOWNSCALE = -1,
135 RS_ACTION_UPSCALE = 1,
136};
137
b3b06a32
ES		 138enum rs_column_mode {
139 RS_INVALID = 0,
140 RS_LEGACY,
141 RS_SISO,
142 RS_MIMO2,
143};
144
145#define MAX_NEXT_COLUMNS 5
146#define MAX_COLUMN_CHECKS 3
147
148typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
149 struct ieee80211_sta *sta,
150 struct iwl_scale_tbl_info *tbl);
151
152struct rs_tx_column {
153 enum rs_column_mode mode;
154 u8 ant;
155 bool sgi;
156 enum rs_column next_columns[MAX_NEXT_COLUMNS];
157 allow_column_func_t checks[MAX_COLUMN_CHECKS];
158};
159
160static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
161 struct iwl_scale_tbl_info *tbl)
162{
163 if (!sta->ht_cap.ht_supported)
164 return false;
165
166 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
167 return false;
168
4ed735e7 169 if (num_of_ant(mvm->fw->valid_tx_ant) < 2)
b3b06a32
ES		 170 return false;
171
172 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
173 return false;
174
175 return true;
176}
177
178static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
179 struct iwl_scale_tbl_info *tbl)
180{
181 if (!sta->ht_cap.ht_supported)
182 return false;
183
184 return true;
185}
186
187static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
188 struct iwl_scale_tbl_info *tbl)
189{
190 struct rs_rate *rate = &tbl->rate;
191 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
192 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
193
194 if (is_ht20(rate) && (ht_cap->cap &
195 IEEE80211_HT_CAP_SGI_20))
196 return true;
197 if (is_ht40(rate) && (ht_cap->cap &
198 IEEE80211_HT_CAP_SGI_40))
199 return true;
200 if (is_ht80(rate) && (vht_cap->cap &
201 IEEE80211_VHT_CAP_SHORT_GI_80))
202 return true;
203
204 return false;
205}
206
207static const struct rs_tx_column rs_tx_columns[] = {
208 [RS_COLUMN_LEGACY_ANT_A] = {
209 .mode = RS_LEGACY,
210 .ant = ANT_A,
211 .next_columns = {
212 RS_COLUMN_LEGACY_ANT_B,
213 RS_COLUMN_SISO_ANT_A,
8930b050 214 RS_COLUMN_SISO_ANT_B,
b3b06a32 215 RS_COLUMN_MIMO2,
8930b050 216 RS_COLUMN_MIMO2_SGI,
b3b06a32
ES		 217 },
218 },
219 [RS_COLUMN_LEGACY_ANT_B] = {
220 .mode = RS_LEGACY,
221 .ant = ANT_B,
222 .next_columns = {
223 RS_COLUMN_LEGACY_ANT_A,
8930b050 224 RS_COLUMN_SISO_ANT_A,
b3b06a32
ES		 225 RS_COLUMN_SISO_ANT_B,
226 RS_COLUMN_MIMO2,
8930b050 227 RS_COLUMN_MIMO2_SGI,
b3b06a32
ES		 228 },
229 },
230 [RS_COLUMN_SISO_ANT_A] = {
231 .mode = RS_SISO,
232 .ant = ANT_A,
233 .next_columns = {
234 RS_COLUMN_SISO_ANT_B,
235 RS_COLUMN_MIMO2,
236 RS_COLUMN_SISO_ANT_A_SGI,
8930b050
ES		 237 RS_COLUMN_SISO_ANT_B_SGI,
238 RS_COLUMN_MIMO2_SGI,
b3b06a32
ES		 239 },
240 .checks = {
241 rs_siso_allow,
242 },
243 },
244 [RS_COLUMN_SISO_ANT_B] = {
245 .mode = RS_SISO,
246 .ant = ANT_B,
247 .next_columns = {
248 RS_COLUMN_SISO_ANT_A,
249 RS_COLUMN_MIMO2,
250 RS_COLUMN_SISO_ANT_B_SGI,
8930b050
ES		 251 RS_COLUMN_SISO_ANT_A_SGI,
252 RS_COLUMN_MIMO2_SGI,
b3b06a32
ES		 253 },
254 .checks = {
255 rs_siso_allow,
256 },
257 },
258 [RS_COLUMN_SISO_ANT_A_SGI] = {
259 .mode = RS_SISO,
260 .ant = ANT_A,
261 .sgi = true,
262 .next_columns = {
263 RS_COLUMN_SISO_ANT_B_SGI,
264 RS_COLUMN_MIMO2_SGI,
265 RS_COLUMN_SISO_ANT_A,
8930b050
ES		 266 RS_COLUMN_SISO_ANT_B,
267 RS_COLUMN_MIMO2,
b3b06a32
ES		 268 },
269 .checks = {
270 rs_siso_allow,
271 rs_sgi_allow,
272 },
273 },
274 [RS_COLUMN_SISO_ANT_B_SGI] = {
275 .mode = RS_SISO,
276 .ant = ANT_B,
277 .sgi = true,
278 .next_columns = {
279 RS_COLUMN_SISO_ANT_A_SGI,
280 RS_COLUMN_MIMO2_SGI,
281 RS_COLUMN_SISO_ANT_B,
8930b050
ES		 282 RS_COLUMN_SISO_ANT_A,
283 RS_COLUMN_MIMO2,
b3b06a32
ES		 284 },
285 .checks = {
286 rs_siso_allow,
287 rs_sgi_allow,
288 },
289 },
290 [RS_COLUMN_MIMO2] = {
291 .mode = RS_MIMO2,
292 .ant = ANT_AB,
293 .next_columns = {
294 RS_COLUMN_SISO_ANT_A,
8930b050
ES		 295 RS_COLUMN_SISO_ANT_B,
296 RS_COLUMN_SISO_ANT_A_SGI,
297 RS_COLUMN_SISO_ANT_B_SGI,
b3b06a32 298 RS_COLUMN_MIMO2_SGI,
b3b06a32
ES		 299 },
300 .checks = {
301 rs_mimo_allow,
302 },
303 },
304 [RS_COLUMN_MIMO2_SGI] = {
305 .mode = RS_MIMO2,
306 .ant = ANT_AB,
307 .sgi = true,
308 .next_columns = {
309 RS_COLUMN_SISO_ANT_A_SGI,
8930b050
ES		 310 RS_COLUMN_SISO_ANT_B_SGI,
311 RS_COLUMN_SISO_ANT_A,
312 RS_COLUMN_SISO_ANT_B,
b3b06a32 313 RS_COLUMN_MIMO2,
b3b06a32
ES		 314 },
315 .checks = {
316 rs_mimo_allow,
317 rs_sgi_allow,
318 },
319 },
320};
321
8ca151b5
JB		 322static inline u8 rs_extract_rate(u32 rate_n_flags)
323{
324 /* also works for HT because bits 7:6 are zero there */
325 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
326}
327
328static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
329{
330 int idx = 0;
331
8ca151b5 332 if (rate_n_flags & RATE_MCS_HT_MSK) {
d310e405
ES		 333 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
334 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 335
d310e405 336 /* skip 9M not supported in HT*/
8ca151b5
JB		 337 if (idx >= IWL_RATE_9M_INDEX)
338 idx += 1;
4e82dd3a 339 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
8ca151b5 340 return idx;
d310e405
ES		 341 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
342 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
343 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 344
d310e405
ES		 345 /* skip 9M not supported in VHT*/
346 if (idx >= IWL_RATE_9M_INDEX)
347 idx++;
348 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
349 return idx;
8ca151b5 350 } else {
d310e405
ES		 351 /* legacy rate format, search for match in table */
352
353 u8 legacy_rate = rs_extract_rate(rate_n_flags);
8ca151b5 354 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
d310e405 355 if (iwl_rates[idx].plcp == legacy_rate)
8ca151b5
JB		 356 return idx;
357 }
358
560843f4 359 return IWL_RATE_INVALID;
8ca151b5
JB		 360}
361
362static void rs_rate_scale_perform(struct iwl_mvm *mvm,
363 struct sk_buff *skb,
364 struct ieee80211_sta *sta,
365 struct iwl_lq_sta *lq_sta);
8fc7c58c
ES		 366static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
367 struct ieee80211_sta *sta,
368 struct iwl_lq_sta *lq_sta,
369 const struct rs_rate *initial_rate);
8ca151b5 370static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
8ca151b5 371
8ca151b5
JB		 372/**
373 * The following tables contain the expected throughput metrics for all rates
374 *
375 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
376 *
377 * where invalid entries are zeros.
378 *
379 * CCK rates are only valid in legacy table and will only be used in G
380 * (2.4 GHz) band.
381 */
382
a34529e8 383static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
4e82dd3a 384 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
8ca151b5
JB		 385};
386
4e82dd3a
ES		 387/* Expected TpT tables. 4 indexes:
388 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
389 */
a34529e8 390static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 391 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
392 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
393 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
394 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
8ca151b5
JB		 395};
396
a34529e8 397static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 398 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
399 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
400 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
401 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
8ca151b5
JB		 402};
403
a34529e8 404static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 405 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
406 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
407 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
408 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
409};
410
a34529e8 411static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 412 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
413 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
414 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
415 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
8ca151b5
JB		 416};
417
a34529e8 418static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 419 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
420 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
421 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
422 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
8ca151b5
JB		 423};
424
a34529e8 425static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 426 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
427 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
428 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
429 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
430};
431
8ca151b5
JB		 432/* mbps, mcs */
433static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
434 { "1", "BPSK DSSS"},
435 { "2", "QPSK DSSS"},
436 {"5.5", "BPSK CCK"},
437 { "11", "QPSK CCK"},
438 { "6", "BPSK 1/2"},
439 { "9", "BPSK 1/2"},
440 { "12", "QPSK 1/2"},
441 { "18", "QPSK 3/4"},
442 { "24", "16QAM 1/2"},
443 { "36", "16QAM 3/4"},
444 { "48", "64QAM 2/3"},
445 { "54", "64QAM 3/4"},
446 { "60", "64QAM 5/6"},
447};
448
449#define MCS_INDEX_PER_STREAM (8)
450
9d10849e
EG		 451static const char *rs_pretty_ant(u8 ant)
452{
453 static const char * const ant_name[] = {
454 [ANT_NONE] = "None",
455 [ANT_A] = "A",
456 [ANT_B] = "B",
457 [ANT_AB] = "AB",
458 [ANT_C] = "C",
459 [ANT_AC] = "AC",
460 [ANT_BC] = "BC",
461 [ANT_ABC] = "ABC",
462 };
463
464 if (ant > ANT_ABC)
465 return "UNKNOWN";
466
467 return ant_name[ant];
468}
469
470static const char *rs_pretty_lq_type(enum iwl_table_type type)
471{
472 static const char * const lq_types[] = {
473 [LQ_NONE] = "NONE",
474 [LQ_LEGACY_A] = "LEGACY_A",
475 [LQ_LEGACY_G] = "LEGACY_G",
476 [LQ_HT_SISO] = "HT SISO",
477 [LQ_HT_MIMO2] = "HT MIMO",
478 [LQ_VHT_SISO] = "VHT SISO",
479 [LQ_VHT_MIMO2] = "VHT MIMO",
480 };
481
482 if (type < LQ_NONE || type >= LQ_MAX)
483 return "UNKNOWN";
484
485 return lq_types[type];
486}
487
5aa33553
ES		 488static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
489 const char *prefix)
490{
491 IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
492 prefix, rs_pretty_lq_type(rate->type),
493 rate->index, rs_pretty_ant(rate->ant),
494 rate->bw, rate->sgi);
495}
496
8ca151b5
JB		 497static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
498{
499 window->data = 0;
500 window->success_counter = 0;
501 window->success_ratio = IWL_INVALID_VALUE;
502 window->counter = 0;
503 window->average_tpt = IWL_INVALID_VALUE;
8ca151b5
JB		 504}
505
506static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
507{
508 return (ant_type & valid_antenna) == ant_type;
509}
510
8ca151b5
JB		 511static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
512 struct iwl_lq_sta *lq_data, u8 tid,
513 struct ieee80211_sta *sta)
514{
515 int ret = -EAGAIN;
8ca151b5 516
44cc429c
EG		 517 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
518 sta->addr, tid);
519 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
520 if (ret == -EAGAIN) {
521 /*
522 * driver and mac80211 is out of sync
523 * this might be cause by reloading firmware
524 * stop the tx ba session here
525 */
526 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
527 tid);
528 ieee80211_stop_tx_ba_session(sta, tid);
8ca151b5
JB		 529 }
530 return ret;
531}
532
533static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
534 struct iwl_lq_sta *lq_data,
535 struct ieee80211_sta *sta)
536{
537 if (tid < IWL_MAX_TID_COUNT)
538 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
539 else
540 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
541 tid, IWL_MAX_TID_COUNT);
542}
543
544static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
545{
546 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
547 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
548 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
549}
550
551/*
552 * Static function to get the expected throughput from an iwl_scale_tbl_info
553 * that wraps a NULL pointer check
554 */
555static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
556{
557 if (tbl->expected_tpt)
558 return tbl->expected_tpt[rs_index];
559 return 0;
560}
561
562/**
563 * rs_collect_tx_data - Update the success/failure sliding window
564 *
565 * We keep a sliding window of the last 62 packets transmitted
566 * at this rate. window->data contains the bitmask of successful
567 * packets.
568 */
0bd3c5a7
EP		 569static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
570 int scale_index, int attempts, int successes,
571 struct iwl_rate_scale_data *window)
8ca151b5 572{
8ca151b5
JB		 573 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
574 s32 fail_count, tpt;
575
8ca151b5
JB		 576 /* Get expected throughput */
577 tpt = get_expected_tpt(tbl, scale_index);
578
579 /*
580 * Keep track of only the latest 62 tx frame attempts in this rate's
581 * history window; anything older isn't really relevant any more.
582 * If we have filled up the sliding window, drop the oldest attempt;
583 * if the oldest attempt (highest bit in bitmap) shows "success",
584 * subtract "1" from the success counter (this is the main reason
585 * we keep these bitmaps!).
586 */
587 while (attempts > 0) {
588 if (window->counter >= IWL_RATE_MAX_WINDOW) {
589 /* remove earliest */
590 window->counter = IWL_RATE_MAX_WINDOW - 1;
591
592 if (window->data & mask) {
593 window->data &= ~mask;
594 window->success_counter--;
595 }
596 }
597
598 /* Increment frames-attempted counter */
599 window->counter++;
600
601 /* Shift bitmap by one frame to throw away oldest history */
602 window->data <<= 1;
603
604 /* Mark the most recent #successes attempts as successful */
605 if (successes > 0) {
606 window->success_counter++;
607 window->data |= 0x1;
608 successes--;
609 }
610
611 attempts--;
612 }
613
614 /* Calculate current success ratio, avoid divide-by-0! */
615 if (window->counter > 0)
616 window->success_ratio = 128 * (100 * window->success_counter)
617 / window->counter;
618 else
619 window->success_ratio = IWL_INVALID_VALUE;
620
621 fail_count = window->counter - window->success_counter;
622
623 /* Calculate average throughput, if we have enough history. */
624 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
625 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
626 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
627 else
628 window->average_tpt = IWL_INVALID_VALUE;
629
8ca151b5
JB		 630 return 0;
631}
632
0bd3c5a7
EP		 633static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
634 int scale_index, int attempts, int successes)
635{
636 struct iwl_rate_scale_data *window = NULL;
637
638 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
639 return -EINVAL;
640
641 /* Select window for current tx bit rate */
642 window = &(tbl->win[scale_index]);
643
644 return _rs_collect_tx_data(tbl, scale_index, attempts, successes,
645 window);
646}
647
5aa33553
ES		 648/* Convert rs_rate object into ucode rate bitmask */
649static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
8fc7c58c 650 struct rs_rate *rate)
8ca151b5 651{
5aa33553
ES		 652 u32 ucode_rate = 0;
653 int index = rate->index;
8ca151b5 654
5aa33553 655 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
d310e405
ES		 656 RATE_MCS_ANT_ABC_MSK);
657
5aa33553
ES		 658 if (is_legacy(rate)) {
659 ucode_rate |= iwl_rates[index].plcp;
8ca151b5 660 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
5aa33553
ES		 661 ucode_rate |= RATE_MCS_CCK_MSK;
662 return ucode_rate;
d310e405
ES		 663 }
664
5aa33553 665 if (is_ht(rate)) {
d310e405 666 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
8ca151b5 667 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
4e82dd3a 668 index = IWL_LAST_HT_RATE;
8ca151b5 669 }
5aa33553 670 ucode_rate |= RATE_MCS_HT_MSK;
8ca151b5 671
5aa33553
ES		 672 if (is_ht_siso(rate))
673 ucode_rate |= iwl_rates[index].plcp_ht_siso;
674 else if (is_ht_mimo2(rate))
675 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
8ca151b5 676 else
d972ab31 677 WARN_ON_ONCE(1);
5aa33553 678 } else if (is_vht(rate)) {
d310e405
ES		 679 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
680 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
681 index = IWL_LAST_VHT_RATE;
682 }
5aa33553
ES		 683 ucode_rate |= RATE_MCS_VHT_MSK;
684 if (is_vht_siso(rate))
685 ucode_rate |= iwl_rates[index].plcp_vht_siso;
686 else if (is_vht_mimo2(rate))
687 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
d310e405
ES		 688 else
689 WARN_ON_ONCE(1);
690
8ca151b5 691 } else {
5aa33553 692 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
8ca151b5
JB		 693 }
694
5aa33553
ES		 695 ucode_rate |= rate->bw;
696 if (rate->sgi)
697 ucode_rate |= RATE_MCS_SGI_MSK;
d310e405 698
5aa33553 699 return ucode_rate;
8ca151b5
JB		 700}
701
5aa33553
ES		 702/* Convert a ucode rate into an rs_rate object */
703static int rs_rate_from_ucode_rate(const u32 ucode_rate,
704 enum ieee80211_band band,
705 struct rs_rate *rate)
8ca151b5 706{
5aa33553
ES		 707 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
708 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
d310e405 709 u8 nss;
8ca151b5 710
9e898f1b 711 memset(rate, 0, sizeof(*rate));
5aa33553 712 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
8ca151b5 713
560843f4 714 if (rate->index == IWL_RATE_INVALID)
8ca151b5 715 return -EINVAL;
5aa33553
ES		 716
717 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
8ca151b5 718
d310e405 719 /* Legacy */
5aa33553
ES		 720 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
721 !(ucode_rate & RATE_MCS_VHT_MSK)) {
8ca151b5
JB		 722 if (num_of_ant == 1) {
723 if (band == IEEE80211_BAND_5GHZ)
5aa33553 724 rate->type = LQ_LEGACY_A;
8ca151b5 725 else
5aa33553 726 rate->type = LQ_LEGACY_G;
8ca151b5 727 }
d310e405
ES		 728
729 return 0;
730 }
731
732 /* HT or VHT */
5aa33553
ES		 733 if (ucode_rate & RATE_MCS_SGI_MSK)
734 rate->sgi = true;
d310e405 735
5aa33553 736 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
d310e405 737
5aa33553
ES		 738 if (ucode_rate & RATE_MCS_HT_MSK) {
739 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
d310e405
ES		 740 RATE_HT_MCS_NSS_POS) + 1;
741
742 if (nss == 1) {
5aa33553 743 rate->type = LQ_HT_SISO;
d310e405
ES		 744 WARN_ON_ONCE(num_of_ant != 1);
745 } else if (nss == 2) {
5aa33553 746 rate->type = LQ_HT_MIMO2;
d310e405 747 WARN_ON_ONCE(num_of_ant != 2);
8ca151b5 748 } else {
d310e405
ES		 749 WARN_ON_ONCE(1);
750 }
5aa33553
ES		 751 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
752 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
d310e405
ES		 753 RATE_VHT_MCS_NSS_POS) + 1;
754
755 if (nss == 1) {
5aa33553 756 rate->type = LQ_VHT_SISO;
d310e405
ES		 757 WARN_ON_ONCE(num_of_ant != 1);
758 } else if (nss == 2) {
5aa33553 759 rate->type = LQ_VHT_MIMO2;
d310e405
ES		 760 WARN_ON_ONCE(num_of_ant != 2);
761 } else {
762 WARN_ON_ONCE(1);
8ca151b5
JB		 763 }
764 }
d310e405 765
5aa33553
ES		 766 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
767 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
768 !is_vht(rate));
d310e405 769
8ca151b5
JB		 770 return 0;
771}
772
773/* switch to another antenna/antennas and return 1 */
774/* if no other valid antenna found, return 0 */
8fc7c58c 775static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
8ca151b5
JB		 776{
777 u8 new_ant_type;
778
5aa33553 779 if (!rate->ant || rate->ant > ANT_ABC)
8ca151b5
JB		 780 return 0;
781
5aa33553 782 if (!rs_is_valid_ant(valid_ant, rate->ant))
8ca151b5
JB		 783 return 0;
784
5aa33553 785 new_ant_type = ant_toggle_lookup[rate->ant];
8ca151b5 786
5aa33553 787 while ((new_ant_type != rate->ant) &&
8ca151b5
JB		 788 !rs_is_valid_ant(valid_ant, new_ant_type))
789 new_ant_type = ant_toggle_lookup[new_ant_type];
790
5aa33553 791 if (new_ant_type == rate->ant)
8ca151b5
JB		 792 return 0;
793
5aa33553
ES		 794 rate->ant = new_ant_type;
795
8ca151b5
JB		 796 return 1;
797}
798
8ca151b5 799static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
5aa33553 800 struct rs_rate *rate)
8ca151b5 801{
5aa33553 802 if (is_legacy(rate))
8ca151b5 803 return lq_sta->active_legacy_rate;
5aa33553 804 else if (is_siso(rate))
d310e405 805 return lq_sta->active_siso_rate;
5aa33553 806 else if (is_mimo2(rate))
d310e405
ES		 807 return lq_sta->active_mimo2_rate;
808
809 WARN_ON_ONCE(1);
810 return 0;
8ca151b5
JB		 811}
812
813static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
814 int rate_type)
815{
816 u8 high = IWL_RATE_INVALID;
817 u8 low = IWL_RATE_INVALID;
818
819 /* 802.11A or ht walks to the next literal adjacent rate in
820 * the rate table */
5aa33553 821 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
8ca151b5
JB		 822 int i;
823 u32 mask;
824
825 /* Find the previous rate that is in the rate mask */
826 i = index - 1;
827 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
828 if (rate_mask & mask) {
829 low = i;
830 break;
831 }
832 }
833
834 /* Find the next rate that is in the rate mask */
835 i = index + 1;
836 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
837 if (rate_mask & mask) {
838 high = i;
839 break;
840 }
841 }
842
843 return (high << 8) | low;
844 }
845
846 low = index;
847 while (low != IWL_RATE_INVALID) {
848 low = iwl_rates[low].prev_rs;
849 if (low == IWL_RATE_INVALID)
850 break;
851 if (rate_mask & (1 << low))
852 break;
853 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
854 }
855
856 high = index;
857 while (high != IWL_RATE_INVALID) {
858 high = iwl_rates[high].next_rs;
859 if (high == IWL_RATE_INVALID)
860 break;
861 if (rate_mask & (1 << high))
862 break;
863 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
864 }
865
866 return (high << 8) | low;
867}
868
e07be6d3
ES		 869static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
870 struct rs_rate *rate)
8ca151b5 871{
e07be6d3
ES		 872 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
873}
874
875/* Get the next supported lower rate in the current column.
876 * Return true if bottom rate in the current column was reached
877 */
878static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
879 struct rs_rate *rate)
880{
881 u8 low;
8ca151b5 882 u16 high_low;
e07be6d3
ES		 883 u16 rate_mask;
884 struct iwl_mvm *mvm = lq_sta->drv;
885
886 rate_mask = rs_get_supported_rates(lq_sta, rate);
887 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
888 rate->type);
889 low = high_low & 0xff;
890
891 /* Bottom rate of column reached */
892 if (low == IWL_RATE_INVALID)
893 return true;
894
895 rate->index = low;
896 return false;
897}
898
899/* Get the next rate to use following a column downgrade */
900static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
901 struct rs_rate *rate)
902{
8ca151b5
JB		 903 struct iwl_mvm *mvm = lq_sta->drv;
904
e07be6d3
ES		 905 if (is_legacy(rate)) {
906 /* No column to downgrade from Legacy */
907 return;
908 } else if (is_siso(rate)) {
909 /* Downgrade to Legacy if we were in SISO */
8ca151b5 910 if (lq_sta->band == IEEE80211_BAND_5GHZ)
5aa33553 911 rate->type = LQ_LEGACY_A;
8ca151b5 912 else
5aa33553 913 rate->type = LQ_LEGACY_G;
8ca151b5 914
a56db7d1 915 rate->bw = RATE_MCS_CHAN_WIDTH_20;
8ca151b5 916
b800040d 917 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
e07be6d3 918 rate->index > IWL_RATE_MCS_9_INDEX);
8ca151b5 919
e07be6d3
ES		 920 rate->index = rs_ht_to_legacy[rate->index];
921 } else {
922 /* Downgrade to SISO with same MCS if in MIMO */
923 rate->type = is_vht_mimo2(rate) ?
924 LQ_VHT_SISO : LQ_HT_SISO;
8ca151b5
JB		 925 }
926
8ca151b5 927
e07be6d3 928 if (num_of_ant(rate->ant) > 1)
4ed735e7 929 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
8ca151b5 930
e07be6d3
ES		 931 /* Relevant in both switching to SISO or Legacy */
932 rate->sgi = false;
933
934 if (!rs_rate_supported(lq_sta, rate))
935 rs_get_lower_rate_in_column(lq_sta, rate);
8ca151b5
JB		 936}
937
5aa33553
ES		 938/* Simple function to compare two rate scale table types */
939static inline bool rs_rate_match(struct rs_rate *a,
940 struct rs_rate *b)
8ca151b5 941{
5aa33553 942 return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
8ca151b5
JB		 943}
944
d310e405
ES		 945static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
946{
947 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
948 return RATE_MCS_CHAN_WIDTH_40;
949 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
950 return RATE_MCS_CHAN_WIDTH_80;
951 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
952 return RATE_MCS_CHAN_WIDTH_160;
953
954 return RATE_MCS_CHAN_WIDTH_20;
955}
956
8ca151b5
JB		 957/*
958 * mac80211 sends us Tx status
959 */
960static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
961 struct ieee80211_sta *sta, void *priv_sta,
962 struct sk_buff *skb)
963{
964 int legacy_success;
965 int retries;
5aa33553 966 int mac_index, i;
8ca151b5
JB		 967 struct iwl_lq_sta *lq_sta = priv_sta;
968 struct iwl_lq_cmd *table;
969 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
970 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
971 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
972 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
973 enum mac80211_rate_control_flags mac_flags;
5aa33553
ES		 974 u32 ucode_rate;
975 struct rs_rate rate;
8ca151b5
JB		 976 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
977
8ca151b5
JB		 978 /* Treat uninitialized rate scaling data same as non-existing. */
979 if (!lq_sta) {
980 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
981 return;
982 } else if (!lq_sta->drv) {
983 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
984 return;
985 }
986
987 if (!ieee80211_is_data(hdr->frame_control) ||
988 info->flags & IEEE80211_TX_CTL_NO_ACK)
989 return;
990
991 /* This packet was aggregated but doesn't carry status info */
992 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
993 !(info->flags & IEEE80211_TX_STAT_AMPDU))
994 return;
995
996 /*
997 * Ignore this Tx frame response if its initial rate doesn't match
998 * that of latest Link Quality command. There may be stragglers
999 * from a previous Link Quality command, but we're no longer interested
1000 * in those; they're either from the "active" mode while we're trying
1001 * to check "search" mode, or a prior "search" mode after we've moved
1002 * to a new "search" mode (which might become the new "active" mode).
1003 */
1004 table = &lq_sta->lq;
5aa33553
ES		 1005 ucode_rate = le32_to_cpu(table->rs_table[0]);
1006 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5 1007 if (info->band == IEEE80211_BAND_5GHZ)
5aa33553 1008 rate.index -= IWL_FIRST_OFDM_RATE;
8ca151b5
JB		 1009 mac_flags = info->status.rates[0].flags;
1010 mac_index = info->status.rates[0].idx;
1011 /* For HT packets, map MCS to PLCP */
1012 if (mac_flags & IEEE80211_TX_RC_MCS) {
1013 /* Remove # of streams */
1014 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1015 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1016 mac_index++;
1017 /*
1018 * mac80211 HT index is always zero-indexed; we need to move
1019 * HT OFDM rates after CCK rates in 2.4 GHz band
1020 */
1021 if (info->band == IEEE80211_BAND_2GHZ)
1022 mac_index += IWL_FIRST_OFDM_RATE;
d310e405
ES		 1023 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1024 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1025 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1026 mac_index++;
8ca151b5 1027 }
d310e405 1028
8ca151b5
JB		 1029 /* Here we actually compare this rate to the latest LQ command */
1030 if ((mac_index < 0) ||
5aa33553
ES		 1031 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1032 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1033 (rate.ant != info->status.antenna) ||
1034 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
d310e405 1035 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
5aa33553 1036 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
d310e405 1037 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
5aa33553 1038 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
d310e405 1039 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
5aa33553 1040 (rate.index != mac_index)) {
8ca151b5
JB		 1041 IWL_DEBUG_RATE(mvm,
1042 "initial rate %d does not match %d (0x%x)\n",
5aa33553 1043 mac_index, rate.index, ucode_rate);
8ca151b5
JB		 1044 /*
1045 * Since rates mis-match, the last LQ command may have failed.
1046 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1047 * ... driver.
1048 */
1049 lq_sta->missed_rate_counter++;
1050 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1051 lq_sta->missed_rate_counter = 0;
b3b06a32
ES		 1052 IWL_DEBUG_RATE(mvm,
1053 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1054 lq_sta->rs_state);
9e680946 1055 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1056 }
1057 /* Regardless, ignore this status info for outdated rate */
1058 return;
1059 } else
1060 /* Rate did match, so reset the missed_rate_counter */
1061 lq_sta->missed_rate_counter = 0;
1062
1063 /* Figure out if rate scale algorithm is in active or search table */
5aa33553
ES		 1064 if (rs_rate_match(&rate,
1065 &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
8ca151b5
JB		 1066 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1067 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553
ES		 1068 } else if (rs_rate_match(&rate,
1069 &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
8ca151b5
JB		 1070 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1071 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1072 } else {
1073 IWL_DEBUG_RATE(mvm,
1074 "Neither active nor search matches tx rate\n");
1075 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 1076 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
8ca151b5 1077 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553
ES		 1078 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1079 rs_dump_rate(mvm, &rate, "ACTUAL");
1080
8ca151b5
JB		 1081 /*
1082 * no matching table found, let's by-pass the data collection
1083 * and continue to perform rate scale to find the rate table
1084 */
1085 rs_stay_in_table(lq_sta, true);
1086 goto done;
1087 }
1088
1089 /*
1090 * Updating the frame history depends on whether packets were
1091 * aggregated.
1092 *
1093 * For aggregation, all packets were transmitted at the same rate, the
1094 * first index into rate scale table.
1095 */
1096 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
5aa33553
ES		 1097 ucode_rate = le32_to_cpu(table->rs_table[0]);
1098 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1099 rs_collect_tx_data(curr_tbl, rate.index,
8ca151b5
JB		 1100 info->status.ampdu_len,
1101 info->status.ampdu_ack_len);
1102
1103 /* Update success/fail counts if not searching for new mode */
b3b06a32 1104 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1105 lq_sta->total_success += info->status.ampdu_ack_len;
1106 lq_sta->total_failed += (info->status.ampdu_len -
1107 info->status.ampdu_ack_len);
1108 }
1109 } else {
1110 /*
1111 * For legacy, update frame history with for each Tx retry.
1112 */
1113 retries = info->status.rates[0].count - 1;
1114 /* HW doesn't send more than 15 retries */
1115 retries = min(retries, 15);
1116
1117 /* The last transmission may have been successful */
1118 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1119 /* Collect data for each rate used during failed TX attempts */
1120 for (i = 0; i <= retries; ++i) {
5aa33553
ES		 1121 ucode_rate = le32_to_cpu(table->rs_table[i]);
1122 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5
JB		 1123 /*
1124 * Only collect stats if retried rate is in the same RS
1125 * table as active/search.
1126 */
5aa33553 1127 if (rs_rate_match(&rate, &curr_tbl->rate))
8ca151b5 1128 tmp_tbl = curr_tbl;
5aa33553 1129 else if (rs_rate_match(&rate, &other_tbl->rate))
8ca151b5 1130 tmp_tbl = other_tbl;
4107dbd2 1131 else
8ca151b5 1132 continue;
4107dbd2 1133
5aa33553 1134 rs_collect_tx_data(tmp_tbl, rate.index, 1,
8ca151b5
JB		 1135 i < retries ? 0 : legacy_success);
1136 }
1137
1138 /* Update success/fail counts if not searching for new mode */
b3b06a32 1139 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1140 lq_sta->total_success += legacy_success;
1141 lq_sta->total_failed += retries + (1 - legacy_success);
1142 }
1143 }
1144 /* The last TX rate is cached in lq_sta; it's set in if/else above */
5aa33553 1145 lq_sta->last_rate_n_flags = ucode_rate;
8ca151b5
JB		 1146done:
1147 /* See if there's a better rate or modulation mode to try. */
1148 if (sta && sta->supp_rates[sband->band])
1149 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1150}
1151
1152/*
1153 * Begin a period of staying with a selected modulation mode.
1154 * Set "stay_in_tbl" flag to prevent any mode switches.
1155 * Set frame tx success limits according to legacy vs. high-throughput,
1156 * and reset overall (spanning all rates) tx success history statistics.
1157 * These control how long we stay using same modulation mode before
1158 * searching for a new mode.
1159 */
1160static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1161 struct iwl_lq_sta *lq_sta)
1162{
b3b06a32
ES		 1163 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1164 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
8ca151b5
JB		 1165 if (is_legacy) {
1166 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1167 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1168 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1169 } else {
1170 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1171 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1172 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1173 }
1174 lq_sta->table_count = 0;
1175 lq_sta->total_failed = 0;
1176 lq_sta->total_success = 0;
1177 lq_sta->flush_timer = jiffies;
b3b06a32 1178 lq_sta->visited_columns = 0;
8ca151b5
JB		 1179}
1180
a34529e8 1181static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
b3b06a32
ES		 1182 const struct rs_tx_column *column,
1183 u32 bw)
8ca151b5
JB		 1184{
1185 /* Used to choose among HT tables */
a34529e8 1186 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
8ca151b5 1187
b3b06a32
ES		 1188 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1189 column->mode != RS_SISO &&
1190 column->mode != RS_MIMO2))
1191 return expected_tpt_legacy;
8ca151b5
JB		 1192
1193 /* Legacy rates have only one table */
b3b06a32
ES		 1194 if (column->mode == RS_LEGACY)
1195 return expected_tpt_legacy;
8ca151b5 1196
d310e405 1197 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
8ca151b5 1198 /* Choose among many HT tables depending on number of streams
d310e405 1199 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
8ca151b5 1200 * status */
b3b06a32
ES		 1201 if (column->mode == RS_SISO) {
1202 switch (bw) {
d310e405
ES		 1203 case RATE_MCS_CHAN_WIDTH_20:
1204 ht_tbl_pointer = expected_tpt_siso_20MHz;
1205 break;
1206 case RATE_MCS_CHAN_WIDTH_40:
1207 ht_tbl_pointer = expected_tpt_siso_40MHz;
1208 break;
1209 case RATE_MCS_CHAN_WIDTH_80:
1210 ht_tbl_pointer = expected_tpt_siso_80MHz;
1211 break;
1212 default:
1213 WARN_ON_ONCE(1);
1214 }
b3b06a32
ES		 1215 } else if (column->mode == RS_MIMO2) {
1216 switch (bw) {
d310e405
ES		 1217 case RATE_MCS_CHAN_WIDTH_20:
1218 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1219 break;
1220 case RATE_MCS_CHAN_WIDTH_40:
1221 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1222 break;
1223 case RATE_MCS_CHAN_WIDTH_80:
1224 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1225 break;
1226 default:
1227 WARN_ON_ONCE(1);
1228 }
1229 } else {
1230 WARN_ON_ONCE(1);
d972ab31 1231 }
8ca151b5 1232
b3b06a32
ES		 1233 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1234 return ht_tbl_pointer[0];
1235 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1236 return ht_tbl_pointer[1];
1237 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1238 return ht_tbl_pointer[2];
8ca151b5 1239 else /* AGG+SGI */
b3b06a32
ES		 1240 return ht_tbl_pointer[3];
1241}
1242
1243static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1244 struct iwl_scale_tbl_info *tbl)
1245{
1246 struct rs_rate *rate = &tbl->rate;
1247 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1248
1249 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
8ca151b5
JB		 1250}
1251
1252/*
1253 * Find starting rate for new "search" high-throughput mode of modulation.
1254 * Goal is to find lowest expected rate (under perfect conditions) that is
1255 * above the current measured throughput of "active" mode, to give new mode
1256 * a fair chance to prove itself without too many challenges.
1257 *
1258 * This gets called when transitioning to more aggressive modulation
1259 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1260 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1261 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1262 * bit rate will typically need to increase, but not if performance was bad.
1263 */
1264static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1265 struct iwl_lq_sta *lq_sta,
1266 struct iwl_scale_tbl_info *tbl, /* "search" */
1267 u16 rate_mask, s8 index)
1268{
1269 /* "active" values */
1270 struct iwl_scale_tbl_info *active_tbl =
1271 &(lq_sta->lq_info[lq_sta->active_tbl]);
1272 s32 active_sr = active_tbl->win[index].success_ratio;
1273 s32 active_tpt = active_tbl->expected_tpt[index];
8ca151b5 1274 /* expected "search" throughput */
a34529e8 1275 const u16 *tpt_tbl = tbl->expected_tpt;
8ca151b5
JB		 1276
1277 s32 new_rate, high, low, start_hi;
1278 u16 high_low;
1279 s8 rate = index;
1280
1281 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1282
1283 while (1) {
1284 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
5aa33553 1285 tbl->rate.type);
8ca151b5
JB		 1286
1287 low = high_low & 0xff;
1288 high = (high_low >> 8) & 0xff;
1289
1290 /*
1291 * Lower the "search" bit rate, to give new "search" mode
1292 * approximately the same throughput as "active" if:
1293 *
1294 * 1) "Active" mode has been working modestly well (but not
1295 * great), and expected "search" throughput (under perfect
1296 * conditions) at candidate rate is above the actual
1297 * measured "active" throughput (but less than expected
1298 * "active" throughput under perfect conditions).
1299 * OR
1300 * 2) "Active" mode has been working perfectly or very well
1301 * and expected "search" throughput (under perfect
1302 * conditions) at candidate rate is above expected
1303 * "active" throughput (under perfect conditions).
1304 */
1305 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
c48075d2 1306 ((active_sr > RS_SR_FORCE_DECREASE) &&
8ca151b5
JB		 1307 (active_sr <= IWL_RATE_HIGH_TH) &&
1308 (tpt_tbl[rate] <= active_tpt))) ||
1309 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1310 (tpt_tbl[rate] > active_tpt))) {
1311 /* (2nd or later pass)
1312 * If we've already tried to raise the rate, and are
1313 * now trying to lower it, use the higher rate. */
1314 if (start_hi != IWL_RATE_INVALID) {
1315 new_rate = start_hi;
1316 break;
1317 }
1318
1319 new_rate = rate;
1320
1321 /* Loop again with lower rate */
1322 if (low != IWL_RATE_INVALID)
1323 rate = low;
1324
1325 /* Lower rate not available, use the original */
1326 else
1327 break;
1328
1329 /* Else try to raise the "search" rate to match "active" */
1330 } else {
1331 /* (2nd or later pass)
1332 * If we've already tried to lower the rate, and are
1333 * now trying to raise it, use the lower rate. */
1334 if (new_rate != IWL_RATE_INVALID)
1335 break;
1336
1337 /* Loop again with higher rate */
1338 else if (high != IWL_RATE_INVALID) {
1339 start_hi = high;
1340 rate = high;
1341
1342 /* Higher rate not available, use the original */
1343 } else {
1344 new_rate = rate;
1345 break;
1346 }
1347 }
1348 }
1349
1350 return new_rate;
1351}
1352
5aa33553 1353static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
d310e405
ES		 1354{
1355 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
5aa33553 1356 return RATE_MCS_CHAN_WIDTH_80;
d310e405 1357 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
5aa33553
ES		 1358 return RATE_MCS_CHAN_WIDTH_40;
1359
1360 return RATE_MCS_CHAN_WIDTH_20;
d310e405
ES		 1361}
1362
8ca151b5
JB		 1363/*
1364 * Check whether we should continue using same modulation mode, or
1365 * begin search for a new mode, based on:
1366 * 1) # tx successes or failures while using this mode
1367 * 2) # times calling this function
1368 * 3) elapsed time in this mode (not used, for now)
1369 */
1370static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1371{
1372 struct iwl_scale_tbl_info *tbl;
1373 int i;
1374 int active_tbl;
1375 int flush_interval_passed = 0;
1376 struct iwl_mvm *mvm;
1377
1378 mvm = lq_sta->drv;
1379 active_tbl = lq_sta->active_tbl;
1380
1381 tbl = &(lq_sta->lq_info[active_tbl]);
1382
1383 /* If we've been disallowing search, see if we should now allow it */
b3b06a32 1384 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1385 /* Elapsed time using current modulation mode */
1386 if (lq_sta->flush_timer)
1387 flush_interval_passed =
1388 time_after(jiffies,
1389 (unsigned long)(lq_sta->flush_timer +
32b01726 1390 RS_STAY_IN_COLUMN_TIMEOUT));
8ca151b5
JB		 1391
1392 /*
1393 * Check if we should allow search for new modulation mode.
1394 * If many frames have failed or succeeded, or we've used
1395 * this same modulation for a long time, allow search, and
1396 * reset history stats that keep track of whether we should
1397 * allow a new search. Also (below) reset all bitmaps and
1398 * stats in active history.
1399 */
1400 if (force_search ||
1401 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1402 (lq_sta->total_success > lq_sta->max_success_limit) ||
1403 ((!lq_sta->search_better_tbl) &&
1404 (lq_sta->flush_timer) && (flush_interval_passed))) {
1405 IWL_DEBUG_RATE(mvm,
1406 "LQ: stay is expired %d %d %d\n",
1407 lq_sta->total_failed,
1408 lq_sta->total_success,
1409 flush_interval_passed);
1410
1411 /* Allow search for new mode */
b3b06a32
ES		 1412 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1413 IWL_DEBUG_RATE(mvm,
1414 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
8ca151b5
JB		 1415 lq_sta->total_failed = 0;
1416 lq_sta->total_success = 0;
1417 lq_sta->flush_timer = 0;
b3b06a32
ES		 1418 /* mark the current column as visited */
1419 lq_sta->visited_columns = BIT(tbl->column);
8ca151b5
JB		 1420 /*
1421 * Else if we've used this modulation mode enough repetitions
1422 * (regardless of elapsed time or success/failure), reset
1423 * history bitmaps and rate-specific stats for all rates in
1424 * active table.
1425 */
1426 } else {
1427 lq_sta->table_count++;
1428 if (lq_sta->table_count >=
1429 lq_sta->table_count_limit) {
1430 lq_sta->table_count = 0;
1431
1432 IWL_DEBUG_RATE(mvm,
1433 "LQ: stay in table clear win\n");
1434 for (i = 0; i < IWL_RATE_COUNT; i++)
1435 rs_rate_scale_clear_window(
1436 &(tbl->win[i]));
1437 }
1438 }
1439
1440 /* If transitioning to allow "search", reset all history
1441 * bitmaps and stats in active table (this will become the new
1442 * "search" table). */
b3b06a32
ES		 1443 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1444 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
8ca151b5
JB		 1445 for (i = 0; i < IWL_RATE_COUNT; i++)
1446 rs_rate_scale_clear_window(&(tbl->win[i]));
1447 }
1448 }
1449}
1450
1451/*
1452 * setup rate table in uCode
1453 */
1454static void rs_update_rate_tbl(struct iwl_mvm *mvm,
9145d151 1455 struct ieee80211_sta *sta,
8ca151b5 1456 struct iwl_lq_sta *lq_sta,
5aa33553 1457 struct rs_rate *rate)
8ca151b5 1458{
8fc7c58c 1459 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
9e680946 1460 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1461}
1462
977342bc
ES		 1463static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1464 struct ieee80211_hdr *hdr)
1465{
1466 u8 tid = IWL_MAX_TID_COUNT;
1467
1468 if (ieee80211_is_data_qos(hdr->frame_control)) {
1469 u8 *qc = ieee80211_get_qos_ctl(hdr);
1470 tid = qc[0] & 0xf;
1471 }
1472
1473 if (unlikely(tid > IWL_MAX_TID_COUNT))
1474 tid = IWL_MAX_TID_COUNT;
1475
1476 return tid;
1477}
1478
b3b06a32
ES		 1479static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1480 struct iwl_lq_sta *lq_sta,
1481 struct ieee80211_sta *sta,
1482 struct iwl_scale_tbl_info *tbl)
1483{
1484 int i, j, n;
1485 enum rs_column next_col_id;
1486 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1487 const struct rs_tx_column *next_col;
1488 allow_column_func_t allow_func;
4ed735e7 1489 u8 valid_ants = mvm->fw->valid_tx_ant;
a34529e8 1490 const u16 *expected_tpt_tbl;
b3b06a32
ES		 1491 s32 tpt, max_expected_tpt;
1492
1493 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1494 next_col_id = curr_col->next_columns[i];
1495
1496 if (next_col_id == RS_COLUMN_INVALID)
1497 continue;
1498
1499 if (lq_sta->visited_columns & BIT(next_col_id)) {
1500 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1501 next_col_id);
1502 continue;
1503 }
1504
1505 next_col = &rs_tx_columns[next_col_id];
1506
1507 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1508 IWL_DEBUG_RATE(mvm,
1509 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1510 next_col_id, valid_ants, next_col->ant);
1511 continue;
1512 }
1513
1514 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1515 allow_func = next_col->checks[j];
1516 if (allow_func && !allow_func(mvm, sta, tbl))
1517 break;
1518 }
1519
1520 if (j != MAX_COLUMN_CHECKS) {
1521 IWL_DEBUG_RATE(mvm,
1522 "Skip column %d: not allowed (check %d failed)\n",
1523 next_col_id, j);
1524
1525 continue;
1526 }
1527
1528 tpt = lq_sta->last_tpt / 100;
1529 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1530 tbl->rate.bw);
1531 if (WARN_ON_ONCE(!expected_tpt_tbl))
1532 continue;
1533
1534 max_expected_tpt = 0;
1535 for (n = 0; n < IWL_RATE_COUNT; n++)
1536 if (expected_tpt_tbl[n] > max_expected_tpt)
1537 max_expected_tpt = expected_tpt_tbl[n];
1538
1539 if (tpt >= max_expected_tpt) {
1540 IWL_DEBUG_RATE(mvm,
1541 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1542 next_col_id, max_expected_tpt, tpt);
1543 continue;
1544 }
1545
1546 break;
1547 }
1548
1549 if (i == MAX_NEXT_COLUMNS)
1550 return RS_COLUMN_INVALID;
1551
1552 IWL_DEBUG_RATE(mvm, "Found potential column %d\n", next_col_id);
1553
1554 return next_col_id;
1555}
1556
1557static int rs_switch_to_column(struct iwl_mvm *mvm,
1558 struct iwl_lq_sta *lq_sta,
1559 struct ieee80211_sta *sta,
1560 enum rs_column col_id)
1561{
1562 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1563 struct iwl_scale_tbl_info *search_tbl =
1564 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1565 struct rs_rate *rate = &search_tbl->rate;
1566 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1567 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1568 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1569 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1570 u16 rate_mask = 0;
1571 u32 rate_idx = 0;
1572
1573 memcpy(search_tbl, tbl, sz);
1574
1575 rate->sgi = column->sgi;
1576 rate->ant = column->ant;
1577
1578 if (column->mode == RS_LEGACY) {
1579 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1580 rate->type = LQ_LEGACY_A;
1581 else
1582 rate->type = LQ_LEGACY_G;
1583
1584 rate_mask = lq_sta->active_legacy_rate;
1585 } else if (column->mode == RS_SISO) {
1586 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1587 rate_mask = lq_sta->active_siso_rate;
1588 } else if (column->mode == RS_MIMO2) {
1589 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1590 rate_mask = lq_sta->active_mimo2_rate;
1591 } else {
1592 WARN_ON_ONCE("Bad column mode");
1593 }
1594
1595 rate->bw = rs_bw_from_sta_bw(sta);
1596 search_tbl->column = col_id;
1597 rs_set_expected_tpt_table(lq_sta, search_tbl);
1598
75d3e2d6
ES		 1599 lq_sta->visited_columns |= BIT(col_id);
1600
b3b06a32
ES		 1601 /* Get the best matching rate if we're changing modes. e.g.
1602 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1603 */
1604 if (curr_column->mode != column->mode) {
1605 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1606 rate_mask, rate->index);
1607
1608 if ((rate_idx == IWL_RATE_INVALID) ||
1609 !(BIT(rate_idx) & rate_mask)) {
1610 IWL_DEBUG_RATE(mvm,
1611 "can not switch with index %d"
1612 " rate mask %x\n",
1613 rate_idx, rate_mask);
1614
1615 goto err;
1616 }
1617
1618 rate->index = rate_idx;
1619 }
1620
b3b06a32
ES		 1621 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1622 col_id, rate->index);
1623
b3b06a32
ES		 1624 return 0;
1625
1626err:
1627 rate->type = LQ_NONE;
1628 return -1;
1629}
1630
4e4b815c
ES		 1631static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1632 struct iwl_scale_tbl_info *tbl,
1633 s32 sr, int low, int high,
1634 int current_tpt,
1635 int low_tpt, int high_tpt)
1636{
1637 enum rs_action action = RS_ACTION_STAY;
1638
1639 /* Too many failures, decrease rate */
1640 if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1641 IWL_DEBUG_RATE(mvm,
1642 "decrease rate because of low SR\n");
1643 action = RS_ACTION_DOWNSCALE;
1644 /* No throughput measured yet for adjacent rates; try increase. */
1645 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1646 (high_tpt == IWL_INVALID_VALUE)) {
1647 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) {
1648 IWL_DEBUG_RATE(mvm,
1649 "Good SR and no high rate measurement. "
1650 "Increase rate\n");
1651 action = RS_ACTION_UPSCALE;
1652 } else if (low != IWL_RATE_INVALID) {
1653 IWL_DEBUG_RATE(mvm,
1654 "Remain in current rate\n");
1655 action = RS_ACTION_STAY;
1656 }
1657 }
1658
1659 /* Both adjacent throughputs are measured, but neither one has better
1660 * throughput; we're using the best rate, don't change it!
1661 */
1662 else if ((low_tpt != IWL_INVALID_VALUE) &&
1663 (high_tpt != IWL_INVALID_VALUE) &&
1664 (low_tpt < current_tpt) &&
1665 (high_tpt < current_tpt)) {
1666 IWL_DEBUG_RATE(mvm,
1667 "Both high and low are worse. "
1668 "Maintain rate\n");
1669 action = RS_ACTION_STAY;
1670 }
1671
1672 /* At least one adjacent rate's throughput is measured,
1673 * and may have better performance.
1674 */
1675 else {
1676 /* Higher adjacent rate's throughput is measured */
1677 if (high_tpt != IWL_INVALID_VALUE) {
1678 /* Higher rate has better throughput */
1679 if (high_tpt > current_tpt &&
1680 sr >= IWL_RATE_INCREASE_TH) {
1681 IWL_DEBUG_RATE(mvm,
1682 "Higher rate is better and good "
1683 "SR. Increate rate\n");
1684 action = RS_ACTION_UPSCALE;
1685 } else {
1686 IWL_DEBUG_RATE(mvm,
1687 "Higher rate isn't better OR "
1688 "no good SR. Maintain rate\n");
1689 action = RS_ACTION_STAY;
1690 }
1691
1692 /* Lower adjacent rate's throughput is measured */
1693 } else if (low_tpt != IWL_INVALID_VALUE) {
1694 /* Lower rate has better throughput */
1695 if (low_tpt > current_tpt) {
1696 IWL_DEBUG_RATE(mvm,
1697 "Lower rate is better. "
1698 "Decrease rate\n");
1699 action = RS_ACTION_DOWNSCALE;
1700 } else if (sr >= IWL_RATE_INCREASE_TH) {
1701 IWL_DEBUG_RATE(mvm,
1702 "Lower rate isn't better and "
1703 "good SR. Increase rate\n");
1704 action = RS_ACTION_UPSCALE;
1705 }
1706 }
1707 }
1708
1709 /* Sanity check; asked for decrease, but success rate or throughput
1710 * has been good at old rate. Don't change it.
1711 */
1712 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID) &&
1713 ((sr > IWL_RATE_HIGH_TH) ||
1714 (current_tpt > (100 * tbl->expected_tpt[low])))) {
1715 IWL_DEBUG_RATE(mvm,
1716 "Sanity check failed. Maintain rate\n");
1717 action = RS_ACTION_STAY;
1718 }
1719
1720 return action;
1721}
b3b06a32 1722
8ca151b5
JB		 1723/*
1724 * Do rate scaling and search for new modulation mode.
1725 */
1726static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1727 struct sk_buff *skb,
1728 struct ieee80211_sta *sta,
1729 struct iwl_lq_sta *lq_sta)
1730{
1731 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1732 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1733 int low = IWL_RATE_INVALID;
1734 int high = IWL_RATE_INVALID;
1735 int index;
1736 int i;
1737 struct iwl_rate_scale_data *window = NULL;
1738 int current_tpt = IWL_INVALID_VALUE;
1739 int low_tpt = IWL_INVALID_VALUE;
1740 int high_tpt = IWL_INVALID_VALUE;
1741 u32 fail_count;
4e4b815c 1742 enum rs_action scale_action = RS_ACTION_STAY;
8ca151b5
JB		 1743 u16 rate_mask;
1744 u8 update_lq = 0;
1745 struct iwl_scale_tbl_info *tbl, *tbl1;
8ca151b5
JB		 1746 u8 active_tbl = 0;
1747 u8 done_search = 0;
1748 u16 high_low;
1749 s32 sr;
1750 u8 tid = IWL_MAX_TID_COUNT;
9d015a03 1751 u8 prev_agg = lq_sta->is_agg;
8ca151b5
JB		 1752 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1753 struct iwl_mvm_tid_data *tid_data;
5aa33553 1754 struct rs_rate *rate;
8ca151b5 1755
8ca151b5
JB		 1756 /* Send management frames and NO_ACK data using lowest rate. */
1757 /* TODO: this could probably be improved.. */
1758 if (!ieee80211_is_data(hdr->frame_control) ||
1759 info->flags & IEEE80211_TX_CTL_NO_ACK)
1760 return;
1761
977342bc 1762 tid = rs_get_tid(lq_sta, hdr);
8ca151b5
JB		 1763 if ((tid != IWL_MAX_TID_COUNT) &&
1764 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1765 tid_data = &sta_priv->tid_data[tid];
1766 if (tid_data->state == IWL_AGG_OFF)
1767 lq_sta->is_agg = 0;
1768 else
1769 lq_sta->is_agg = 1;
1770 } else {
1771 lq_sta->is_agg = 0;
1772 }
1773
1774 /*
1775 * Select rate-scale / modulation-mode table to work with in
1776 * the rest of this function: "search" if searching for better
1777 * modulation mode, or "active" if doing rate scaling within a mode.
1778 */
1779 if (!lq_sta->search_better_tbl)
1780 active_tbl = lq_sta->active_tbl;
1781 else
1782 active_tbl = 1 - lq_sta->active_tbl;
1783
1784 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 1785 rate = &tbl->rate;
8ca151b5 1786
9d015a03
ES		 1787 if (prev_agg != lq_sta->is_agg) {
1788 IWL_DEBUG_RATE(mvm,
1789 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
1790 prev_agg, lq_sta->is_agg);
1791 rs_set_expected_tpt_table(lq_sta, tbl);
1792 }
1793
8ca151b5
JB		 1794 /* current tx rate */
1795 index = lq_sta->last_txrate_idx;
1796
8ca151b5 1797 /* rates available for this association, and for modulation mode */
a8ff14f5 1798 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5 1799
ca6f38ff 1800 if (!(BIT(index) & rate_mask)) {
8ca151b5
JB		 1801 IWL_ERR(mvm, "Current Rate is not valid\n");
1802 if (lq_sta->search_better_tbl) {
1803 /* revert to active table if search table is not valid*/
5aa33553 1804 rate->type = LQ_NONE;
8ca151b5
JB		 1805 lq_sta->search_better_tbl = 0;
1806 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 1807 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
8ca151b5
JB		 1808 }
1809 return;
1810 }
1811
1812 /* Get expected throughput table and history window for current rate */
1813 if (!tbl->expected_tpt) {
1814 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1815 return;
1816 }
1817
1818 /* force user max rate if set by user */
1819 if ((lq_sta->max_rate_idx != -1) &&
1820 (lq_sta->max_rate_idx < index)) {
1821 index = lq_sta->max_rate_idx;
1822 update_lq = 1;
1823 window = &(tbl->win[index]);
4d30ee82
ES		 1824 IWL_DEBUG_RATE(mvm,
1825 "Forcing user max rate %d\n",
1826 index);
8ca151b5
JB		 1827 goto lq_update;
1828 }
1829
1830 window = &(tbl->win[index]);
1831
1832 /*
1833 * If there is not enough history to calculate actual average
1834 * throughput, keep analyzing results of more tx frames, without
1835 * changing rate or mode (bypass most of the rest of this function).
1836 * Set up new rate table in uCode only if old rate is not supported
1837 * in current association (use new rate found above).
1838 */
1839 fail_count = window->counter - window->success_counter;
1840 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1841 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1842 IWL_DEBUG_RATE(mvm,
4d30ee82 1843 "(%s: %d): Test Window: succ %d total %d\n",
5aa33553 1844 rs_pretty_lq_type(rate->type),
4d30ee82 1845 index, window->success_counter, window->counter);
8ca151b5
JB		 1846
1847 /* Can't calculate this yet; not enough history */
1848 window->average_tpt = IWL_INVALID_VALUE;
1849
1850 /* Should we stay with this modulation mode,
1851 * or search for a new one? */
1852 rs_stay_in_table(lq_sta, false);
1853
1854 goto out;
1855 }
1856 /* Else we have enough samples; calculate estimate of
1857 * actual average throughput */
1858 if (window->average_tpt != ((window->success_ratio *
1859 tbl->expected_tpt[index] + 64) / 128)) {
8ca151b5
JB		 1860 window->average_tpt = ((window->success_ratio *
1861 tbl->expected_tpt[index] + 64) / 128);
1862 }
1863
1864 /* If we are searching for better modulation mode, check success. */
1865 if (lq_sta->search_better_tbl) {
1866 /* If good success, continue using the "search" mode;
1867 * no need to send new link quality command, since we're
1868 * continuing to use the setup that we've been trying. */
1869 if (window->average_tpt > lq_sta->last_tpt) {
1870 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1871 "SWITCHING TO NEW TABLE SR: %d "
1872 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 1873 window->success_ratio,
1874 window->average_tpt,
1875 lq_sta->last_tpt);
1876
8ca151b5
JB		 1877 /* Swap tables; "search" becomes "active" */
1878 lq_sta->active_tbl = active_tbl;
1879 current_tpt = window->average_tpt;
1880 /* Else poor success; go back to mode in "active" table */
1881 } else {
1882 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1883 "GOING BACK TO THE OLD TABLE: SR %d "
1884 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 1885 window->success_ratio,
1886 window->average_tpt,
1887 lq_sta->last_tpt);
1888
1889 /* Nullify "search" table */
5aa33553 1890 rate->type = LQ_NONE;
8ca151b5
JB		 1891
1892 /* Revert to "active" table */
1893 active_tbl = lq_sta->active_tbl;
1894 tbl = &(lq_sta->lq_info[active_tbl]);
1895
1896 /* Revert to "active" rate and throughput info */
8fc7c58c 1897 index = tbl->rate.index;
8ca151b5
JB		 1898 current_tpt = lq_sta->last_tpt;
1899
1900 /* Need to set up a new rate table in uCode */
1901 update_lq = 1;
1902 }
1903
1904 /* Either way, we've made a decision; modulation mode
1905 * search is done, allow rate adjustment next time. */
1906 lq_sta->search_better_tbl = 0;
1907 done_search = 1; /* Don't switch modes below! */
1908 goto lq_update;
1909 }
1910
1911 /* (Else) not in search of better modulation mode, try for better
1912 * starting rate, while staying in this mode. */
ca6f38ff 1913 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
8ca151b5
JB		 1914 low = high_low & 0xff;
1915 high = (high_low >> 8) & 0xff;
1916
1917 /* If user set max rate, dont allow higher than user constrain */
1918 if ((lq_sta->max_rate_idx != -1) &&
1919 (lq_sta->max_rate_idx < high))
1920 high = IWL_RATE_INVALID;
1921
1922 sr = window->success_ratio;
1923
1924 /* Collect measured throughputs for current and adjacent rates */
1925 current_tpt = window->average_tpt;
1926 if (low != IWL_RATE_INVALID)
1927 low_tpt = tbl->win[low].average_tpt;
1928 if (high != IWL_RATE_INVALID)
1929 high_tpt = tbl->win[high].average_tpt;
1930
4d30ee82
ES		 1931 IWL_DEBUG_RATE(mvm,
1932 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
5aa33553
ES		 1933 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
1934 low, high, low_tpt, high_tpt);
4d30ee82 1935
4e4b815c
ES		 1936 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
1937 current_tpt, low_tpt, high_tpt);
8ca151b5 1938
393b9e5b 1939 /* Force a search in case BT doesn't like us being in MIMO */
5aa33553 1940 if (is_mimo(rate) &&
393b9e5b 1941 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
4d30ee82
ES		 1942 IWL_DEBUG_RATE(mvm,
1943 "BT Coex forbids MIMO. Search for new config\n");
36946ce6
EG		 1944 rs_stay_in_table(lq_sta, true);
1945 goto lq_update;
1946 }
1947
8ca151b5 1948 switch (scale_action) {
4e4b815c 1949 case RS_ACTION_DOWNSCALE:
8ca151b5
JB		 1950 /* Decrease starting rate, update uCode's rate table */
1951 if (low != IWL_RATE_INVALID) {
1952 update_lq = 1;
1953 index = low;
4d30ee82
ES		 1954 } else {
1955 IWL_DEBUG_RATE(mvm,
1956 "At the bottom rate. Can't decrease\n");
8ca151b5
JB		 1957 }
1958
1959 break;
4e4b815c 1960 case RS_ACTION_UPSCALE:
8ca151b5
JB		 1961 /* Increase starting rate, update uCode's rate table */
1962 if (high != IWL_RATE_INVALID) {
1963 update_lq = 1;
1964 index = high;
4d30ee82
ES		 1965 } else {
1966 IWL_DEBUG_RATE(mvm,
1967 "At the top rate. Can't increase\n");
8ca151b5
JB		 1968 }
1969
1970 break;
4e4b815c 1971 case RS_ACTION_STAY:
8ca151b5
JB		 1972 /* No change */
1973 default:
1974 break;
1975 }
1976
8ca151b5
JB		 1977lq_update:
1978 /* Replace uCode's rate table for the destination station. */
5aa33553
ES		 1979 if (update_lq) {
1980 tbl->rate.index = index;
1981 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
1982 }
8ca151b5
JB		 1983
1984 rs_stay_in_table(lq_sta, false);
1985
1986 /*
1987 * Search for new modulation mode if we're:
1988 * 1) Not changing rates right now
1989 * 2) Not just finishing up a search
1990 * 3) Allowing a new search
1991 */
1992 if (!update_lq && !done_search &&
b3b06a32
ES		 1993 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
1994 && window->counter) {
1995 enum rs_column next_column;
1996
8ca151b5
JB		 1997 /* Save current throughput to compare with "search" throughput*/
1998 lq_sta->last_tpt = current_tpt;
1999
4d30ee82 2000 IWL_DEBUG_RATE(mvm,
b3b06a32
ES		 2001 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2002 update_lq, done_search, lq_sta->rs_state,
4d30ee82 2003 window->counter);
b3b06a32
ES		 2004
2005 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2006 if (next_column != RS_COLUMN_INVALID) {
2007 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2008 next_column);
2009 if (!ret)
2010 lq_sta->search_better_tbl = 1;
2011 } else {
2012 IWL_DEBUG_RATE(mvm,
2013 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2014 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2015 }
8ca151b5
JB		 2016
2017 /* If new "search" mode was selected, set up in uCode table */
2018 if (lq_sta->search_better_tbl) {
2019 /* Access the "search" table, clear its history. */
2020 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2021 for (i = 0; i < IWL_RATE_COUNT; i++)
2022 rs_rate_scale_clear_window(&(tbl->win[i]));
2023
2024 /* Use new "search" start rate */
8fc7c58c 2025 index = tbl->rate.index;
8ca151b5 2026
b3b06a32
ES		 2027 rs_dump_rate(mvm, &tbl->rate,
2028 "Switch to SEARCH TABLE:");
8fc7c58c 2029 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
9e680946 2030 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 2031 } else {
2032 done_search = 1;
2033 }
2034 }
2035
b3b06a32 2036 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
8ca151b5
JB		 2037 /* If the "active" (non-search) mode was legacy,
2038 * and we've tried switching antennas,
2039 * but we haven't been able to try HT modes (not available),
2040 * stay with best antenna legacy modulation for a while
2041 * before next round of mode comparisons. */
2042 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
b3b06a32 2043 if (is_legacy(&tbl1->rate) && !sta->ht_cap.ht_supported) {
8ca151b5
JB		 2044 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2045 rs_set_stay_in_table(mvm, 1, lq_sta);
b3b06a32 2046 } else {
8ca151b5
JB		 2047 /* If we're in an HT mode, and all 3 mode switch actions
2048 * have been tried and compared, stay in this best modulation
2049 * mode for a while before next round of mode comparisons. */
8ca151b5
JB		 2050 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2051 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2052 (tid != IWL_MAX_TID_COUNT)) {
2053 tid_data = &sta_priv->tid_data[tid];
2054 if (tid_data->state == IWL_AGG_OFF) {
2055 IWL_DEBUG_RATE(mvm,
2056 "try to aggregate tid %d\n",
2057 tid);
2058 rs_tl_turn_on_agg(mvm, tid,
2059 lq_sta, sta);
2060 }
2061 }
2062 rs_set_stay_in_table(mvm, 0, lq_sta);
2063 }
2064 }
2065
2066out:
8ca151b5
JB		 2067 lq_sta->last_txrate_idx = index;
2068}
2069
2070/**
2071 * rs_initialize_lq - Initialize a station's hardware rate table
2072 *
2073 * The uCode's station table contains a table of fallback rates
2074 * for automatic fallback during transmission.
2075 *
2076 * NOTE: This sets up a default set of values. These will be replaced later
2077 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2078 * rc80211_simple.
2079 *
2080 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2081 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2082 * which requires station table entry to exist).
2083 */
2084static void rs_initialize_lq(struct iwl_mvm *mvm,
2085 struct ieee80211_sta *sta,
2086 struct iwl_lq_sta *lq_sta,
b87c2179
ES		 2087 enum ieee80211_band band,
2088 bool init)
8ca151b5
JB		 2089{
2090 struct iwl_scale_tbl_info *tbl;
5aa33553 2091 struct rs_rate *rate;
8ca151b5 2092 int i;
8ca151b5
JB		 2093 u8 active_tbl = 0;
2094 u8 valid_tx_ant;
2095
2096 if (!sta || !lq_sta)
2097 return;
2098
2099 i = lq_sta->last_txrate_idx;
2100
4ed735e7 2101 valid_tx_ant = mvm->fw->valid_tx_ant;
8ca151b5
JB		 2102
2103 if (!lq_sta->search_better_tbl)
2104 active_tbl = lq_sta->active_tbl;
2105 else
2106 active_tbl = 1 - lq_sta->active_tbl;
2107
2108 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2109 rate = &tbl->rate;
8ca151b5
JB		 2110
2111 if ((i < 0) || (i >= IWL_RATE_COUNT))
2112 i = 0;
2113
b3b06a32 2114 rate->index = i;
5aa33553 2115 rate->ant = first_antenna(valid_tx_ant);
b3b06a32
ES		 2116 rate->sgi = false;
2117 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2118 if (band == IEEE80211_BAND_5GHZ)
2119 rate->type = LQ_LEGACY_A;
2120 else
2121 rate->type = LQ_LEGACY_G;
8ca151b5 2122
b3b06a32
ES		 2123 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2124 if (rate->ant == ANT_A)
2125 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2126 else
2127 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2128
8ca151b5 2129 rs_set_expected_tpt_table(lq_sta, tbl);
80e9e5cd 2130 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
8ca151b5 2131 /* TODO restore station should remember the lq cmd */
b87c2179 2132 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
8ca151b5
JB		 2133}
2134
2135static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2136 struct ieee80211_tx_rate_control *txrc)
2137{
2138 struct sk_buff *skb = txrc->skb;
2139 struct ieee80211_supported_band *sband = txrc->sband;
2140 struct iwl_op_mode *op_mode __maybe_unused =
2141 (struct iwl_op_mode *)mvm_r;
2142 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2143 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2144 struct iwl_lq_sta *lq_sta = mvm_sta;
8ca151b5 2145
8ca151b5
JB		 2146 /* Get max rate if user set max rate */
2147 if (lq_sta) {
2148 lq_sta->max_rate_idx = txrc->max_rate_idx;
2149 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2150 (lq_sta->max_rate_idx != -1))
2151 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2152 if ((lq_sta->max_rate_idx < 0) ||
2153 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2154 lq_sta->max_rate_idx = -1;
2155 }
2156
2157 /* Treat uninitialized rate scaling data same as non-existing. */
2158 if (lq_sta && !lq_sta->drv) {
2159 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2160 mvm_sta = NULL;
2161 }
2162
2163 /* Send management frames and NO_ACK data using lowest rate. */
2164 if (rate_control_send_low(sta, mvm_sta, txrc))
2165 return;
2166
d310e405
ES		 2167 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2168 info->band, &info->control.rates[0]);
2169
622ebe99 2170 info->control.rates[0].count = 1;
8ca151b5
JB		 2171}
2172
2173static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2174 gfp_t gfp)
2175{
2176 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2177 struct iwl_op_mode *op_mode __maybe_unused =
2178 (struct iwl_op_mode *)mvm_rate;
2179 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2180
2181 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2182
2183 return &sta_priv->lq_sta;
2184}
2185
d310e405
ES		 2186static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2187 int nss)
2188{
2189 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2190 (0x3 << (2 * (nss - 1)));
2191 rx_mcs >>= (2 * (nss - 1));
2192
2193 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2194 return IWL_RATE_MCS_7_INDEX;
2195 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2196 return IWL_RATE_MCS_8_INDEX;
2197 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2198 return IWL_RATE_MCS_9_INDEX;
2199
2200 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2201 return -1;
2202}
2203
750a1b45
ES		 2204static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2205 struct ieee80211_sta_vht_cap *vht_cap,
2206 struct iwl_lq_sta *lq_sta)
2207{
2208 int i;
2209 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2210
2211 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2212 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2213 if (i == IWL_RATE_9M_INDEX)
2214 continue;
2215
4623a265
ES		 2216 /* Disable MCS9 as a workaround */
2217 if (i == IWL_RATE_MCS_9_INDEX)
2218 continue;
2219
271518ad
ES		 2220 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2221 if (i == IWL_RATE_MCS_9_INDEX &&
2222 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2223 continue;
2224
750a1b45
ES		 2225 lq_sta->active_siso_rate |= BIT(i);
2226 }
2227 }
2228
ecc90e79
ES		 2229 if (sta->rx_nss < 2)
2230 return;
2231
750a1b45
ES		 2232 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2233 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2234 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2235 if (i == IWL_RATE_9M_INDEX)
2236 continue;
2237
4623a265
ES		 2238 /* Disable MCS9 as a workaround */
2239 if (i == IWL_RATE_MCS_9_INDEX)
2240 continue;
2241
271518ad
ES		 2242 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2243 if (i == IWL_RATE_MCS_9_INDEX &&
2244 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2245 continue;
2246
750a1b45
ES		 2247 lq_sta->active_mimo2_rate |= BIT(i);
2248 }
2249 }
2250}
2251
5fc0f76c
ES		 2252#ifdef CONFIG_IWLWIFI_DEBUGFS
2253static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2254 struct iwl_mvm_frame_stats *stats)
2255{
2256 spin_lock_bh(&mvm->drv_stats_lock);
2257 memset(stats, 0, sizeof(*stats));
2258 spin_unlock_bh(&mvm->drv_stats_lock);
2259}
2260
2261void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2262 struct iwl_mvm_frame_stats *stats,
2263 u32 rate, bool agg)
2264{
2265 u8 nss = 0, mcs = 0;
2266
2267 spin_lock(&mvm->drv_stats_lock);
2268
2269 if (agg)
2270 stats->agg_frames++;
2271
2272 stats->success_frames++;
2273
2274 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2275 case RATE_MCS_CHAN_WIDTH_20:
2276 stats->bw_20_frames++;
2277 break;
2278 case RATE_MCS_CHAN_WIDTH_40:
2279 stats->bw_40_frames++;
2280 break;
2281 case RATE_MCS_CHAN_WIDTH_80:
2282 stats->bw_80_frames++;
2283 break;
2284 default:
2285 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2286 }
2287
2288 if (rate & RATE_MCS_HT_MSK) {
2289 stats->ht_frames++;
2290 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2291 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2292 } else if (rate & RATE_MCS_VHT_MSK) {
2293 stats->vht_frames++;
2294 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2295 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2296 RATE_VHT_MCS_NSS_POS) + 1;
2297 } else {
2298 stats->legacy_frames++;
2299 }
2300
2301 if (nss == 1)
2302 stats->siso_frames++;
2303 else if (nss == 2)
2304 stats->mimo2_frames++;
2305
2306 if (rate & RATE_MCS_SGI_MSK)
2307 stats->sgi_frames++;
2308 else
2309 stats->ngi_frames++;
2310
2311 stats->last_rates[stats->last_frame_idx] = rate;
2312 stats->last_frame_idx = (stats->last_frame_idx + 1) %
2313 ARRAY_SIZE(stats->last_rates);
2314
2315 spin_unlock(&mvm->drv_stats_lock);
2316}
2317#endif
2318
8ca151b5
JB		 2319/*
2320 * Called after adding a new station to initialize rate scaling
2321 */
2322void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
b87c2179 2323 enum ieee80211_band band, bool init)
8ca151b5
JB		 2324{
2325 int i, j;
2326 struct ieee80211_hw *hw = mvm->hw;
2327 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
d310e405 2328 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
8ca151b5
JB		 2329 struct iwl_mvm_sta *sta_priv;
2330 struct iwl_lq_sta *lq_sta;
2331 struct ieee80211_supported_band *sband;
2332 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2333
2334 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2335 lq_sta = &sta_priv->lq_sta;
b87c2179
ES		 2336 memset(lq_sta, 0, sizeof(*lq_sta));
2337
8ca151b5
JB		 2338 sband = hw->wiphy->bands[band];
2339
2340 lq_sta->lq.sta_id = sta_priv->sta_id;
2341
2342 for (j = 0; j < LQ_SIZE; j++)
2343 for (i = 0; i < IWL_RATE_COUNT; i++)
2344 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2345
2346 lq_sta->flush_timer = 0;
8ca151b5
JB		 2347
2348 IWL_DEBUG_RATE(mvm,
2349 "LQ: *** rate scale station global init for station %d ***\n",
2350 sta_priv->sta_id);
2351 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2352 * the lowest or the highest rate.. Could consider using RSSI from
2353 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2354 * after assoc.. */
2355
2356 lq_sta->max_rate_idx = -1;
2357 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
8ca151b5
JB		 2358 lq_sta->band = sband->band;
2359 /*
2360 * active legacy rates as per supported rates bitmap
2361 */
2362 supp = sta->supp_rates[sband->band];
2363 lq_sta->active_legacy_rate = 0;
2364 for_each_set_bit(i, &supp, BITS_PER_LONG)
2365 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2366
d310e405
ES		 2367 /* TODO: should probably account for rx_highest for both HT/VHT */
2368 if (!vht_cap || !vht_cap->vht_supported) {
2369 /* active_siso_rate mask includes 9 MBits (bit 5),
2370 * and CCK (bits 0-3), supp_rates[] does not;
2371 * shift to convert format, force 9 MBits off.
2372 */
2373 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2374 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2375 lq_sta->active_siso_rate &= ~((u16)0x2);
2376 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2377
2378 /* Same here */
2379 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2380 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2381 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2382 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2383
2384 lq_sta->is_vht = false;
2385 } else {
750a1b45 2386 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
d310e405
ES		 2387 lq_sta->is_vht = true;
2388 }
8ca151b5 2389
8ca151b5 2390 IWL_DEBUG_RATE(mvm,
d310e405 2391 "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
8ca151b5 2392 lq_sta->active_siso_rate,
d310e405
ES		 2393 lq_sta->active_mimo2_rate,
2394 lq_sta->is_vht);
8ca151b5
JB		 2395
2396 /* These values will be overridden later */
2397 lq_sta->lq.single_stream_ant_msk =
4ed735e7 2398 first_antenna(mvm->fw->valid_tx_ant);
809bccfa 2399 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
8ca151b5
JB		 2400
2401 /* as default allow aggregation for all tids */
2402 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2403 lq_sta->drv = mvm;
2404
2405 /* Set last_txrate_idx to lowest rate */
2406 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2407 if (sband->band == IEEE80211_BAND_5GHZ)
2408 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2409 lq_sta->is_agg = 0;
2410#ifdef CONFIG_MAC80211_DEBUGFS
2411 lq_sta->dbg_fixed_rate = 0;
2412#endif
5fc0f76c
ES		 2413#ifdef CONFIG_IWLWIFI_DEBUGFS
2414 iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2415#endif
b87c2179
ES		 2416 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2417}
2418
2419static void rs_rate_update(void *mvm_r,
2420 struct ieee80211_supported_band *sband,
2421 struct cfg80211_chan_def *chandef,
2422 struct ieee80211_sta *sta, void *priv_sta,
2423 u32 changed)
2424{
2425 u8 tid;
2426 struct iwl_op_mode *op_mode =
2427 (struct iwl_op_mode *)mvm_r;
2428 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2429
2430 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2431 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2432 ieee80211_stop_tx_ba_session(sta, tid);
2433
2434 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
8ca151b5
JB		 2435}
2436
8fc7c58c
ES		 2437#ifdef CONFIG_MAC80211_DEBUGFS
2438static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2439 struct iwl_lq_cmd *lq_cmd,
2440 enum ieee80211_band band,
2441 u32 ucode_rate)
2442{
2443 struct rs_rate rate;
2444 int i;
2445 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2446 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2447
2448 for (i = 0; i < num_rates; i++)
2449 lq_cmd->rs_table[i] = ucode_rate_le32;
2450
2451 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2452
2453 if (is_mimo(&rate))
2454 lq_cmd->mimo_delim = num_rates - 1;
2455 else
2456 lq_cmd->mimo_delim = 0;
2457}
2458#endif /* CONFIG_MAC80211_DEBUGFS */
2459
e07be6d3
ES		 2460static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2461 struct iwl_lq_sta *lq_sta,
2462 struct rs_rate *rate,
2463 __le32 *rs_table, int *rs_table_index,
2464 int num_rates, int num_retries,
2465 u8 valid_tx_ant, bool toggle_ant)
2466{
2467 int i, j;
2468 __le32 ucode_rate;
2469 bool bottom_reached = false;
2470 int prev_rate_idx = rate->index;
2471 int end = LINK_QUAL_MAX_RETRY_NUM;
2472 int index = *rs_table_index;
2473
2474 for (i = 0; i < num_rates && index < end; i++) {
2475 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2476 for (j = 0; j < num_retries && index < end; j++, index++)
2477 rs_table[index] = ucode_rate;
2478
2479 if (toggle_ant)
2480 rs_toggle_antenna(valid_tx_ant, rate);
2481
2482 prev_rate_idx = rate->index;
2483 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2484 if (bottom_reached && !is_legacy(rate))
2485 break;
2486 }
2487
2488 if (!bottom_reached)
2489 rate->index = prev_rate_idx;
2490
2491 *rs_table_index = index;
2492}
2493
2494/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2495 * column the rate table should look like this:
2496 *
2497 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2498 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2499 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2500 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2501 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2502 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2503 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2504 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2505 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2506 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2507 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2508 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2509 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2510 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2511 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2512 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2513 */
8fc7c58c
ES		 2514static void rs_build_rates_table(struct iwl_mvm *mvm,
2515 struct iwl_lq_sta *lq_sta,
2516 const struct rs_rate *initial_rate)
8ca151b5 2517{
5aa33553 2518 struct rs_rate rate;
e07be6d3 2519 int num_rates, num_retries, index = 0;
8ca151b5
JB		 2520 u8 valid_tx_ant = 0;
2521 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
e07be6d3 2522 bool toggle_ant = false;
8ca151b5 2523
9e898f1b 2524 memcpy(&rate, initial_rate, sizeof(rate));
8fc7c58c 2525
4ed735e7 2526 valid_tx_ant = mvm->fw->valid_tx_ant;
8ca151b5 2527
e07be6d3
ES		 2528 if (is_siso(&rate)) {
2529 num_rates = RS_INITIAL_SISO_NUM_RATES;
2530 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2531 } else if (is_mimo(&rate)) {
2532 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2533 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
8ca151b5 2534 } else {
e07be6d3
ES		 2535 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2536 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2537 toggle_ant = true;
8ca151b5
JB		 2538 }
2539
e07be6d3
ES		 2540 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2541 num_rates, num_retries, valid_tx_ant,
2542 toggle_ant);
8ca151b5 2543
e07be6d3 2544 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 2545
e07be6d3
ES		 2546 if (is_siso(&rate)) {
2547 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2548 num_retries = RS_SECONDARY_SISO_RETRIES;
2549 } else if (is_legacy(&rate)) {
2550 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2551 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2552 } else {
2553 WARN_ON_ONCE(1);
2554 }
8ca151b5 2555
e07be6d3 2556 toggle_ant = true;
8ca151b5 2557
e07be6d3
ES		 2558 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2559 num_rates, num_retries, valid_tx_ant,
2560 toggle_ant);
8ca151b5 2561
e07be6d3 2562 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 2563
e07be6d3
ES		 2564 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2565 num_retries = RS_LEGACY_RETRIES_PER_RATE;
8ca151b5 2566
e07be6d3
ES		 2567 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2568 num_rates, num_retries, valid_tx_ant,
2569 toggle_ant);
8ca151b5 2570
8fc7c58c
ES		 2571}
2572
2573static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2574 struct ieee80211_sta *sta,
2575 struct iwl_lq_sta *lq_sta,
2576 const struct rs_rate *initial_rate)
2577{
2578 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2579 u8 ant = initial_rate->ant;
2580
2581#ifdef CONFIG_MAC80211_DEBUGFS
2582 if (lq_sta->dbg_fixed_rate) {
2583 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2584 lq_sta->band,
2585 lq_sta->dbg_fixed_rate);
2586 ant = (lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2587 RATE_MCS_ANT_POS;
2588 } else
2589#endif
2590 rs_build_rates_table(mvm, lq_sta, initial_rate);
2591
2592 if (num_of_ant(ant) == 1)
2593 lq_cmd->single_stream_ant_msk = ant;
8ca151b5
JB		 2594
2595 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2596 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2597
2598 lq_cmd->agg_time_limit =
2599 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
e96d551f 2600
9145d151
EG		 2601 if (sta)
2602 lq_cmd->agg_time_limit =
5b7ff615 2603 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
8ca151b5
JB		 2604}
2605
2606static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2607{
2608 return hw->priv;
2609}
2610/* rate scale requires free function to be implemented */
2611static void rs_free(void *mvm_rate)
2612{
2613 return;
2614}
2615
2616static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2617 void *mvm_sta)
2618{
2619 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2620 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2621
2622 IWL_DEBUG_RATE(mvm, "enter\n");
2623 IWL_DEBUG_RATE(mvm, "leave\n");
2624}
2625
2626#ifdef CONFIG_MAC80211_DEBUGFS
5fc0f76c 2627int rs_pretty_print_rate(char *buf, const u32 rate)
5aa33553
ES		 2628{
2629
1a61b347
ES		 2630 char *type, *bw;
2631 u8 mcs = 0, nss = 0;
2632 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2633
2634 if (!(rate & RATE_MCS_HT_MSK) &&
2635 !(rate & RATE_MCS_VHT_MSK)) {
2636 int index = iwl_hwrate_to_plcp_idx(rate);
2637
2638 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
560843f4
ES		 2639 rs_pretty_ant(ant),
2640 index == IWL_RATE_INVALID ? "BAD" :
2641 iwl_rate_mcs[index].mbps);
1a61b347
ES		 2642 }
2643
2644 if (rate & RATE_MCS_VHT_MSK) {
2645 type = "VHT";
2646 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2647 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2648 >> RATE_VHT_MCS_NSS_POS) + 1;
2649 } else if (rate & RATE_MCS_HT_MSK) {
2650 type = "HT";
2651 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2652 } else {
2653 type = "Unknown"; /* shouldn't happen */
2654 }
2655
2656 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2657 case RATE_MCS_CHAN_WIDTH_20:
2658 bw = "20Mhz";
2659 break;
2660 case RATE_MCS_CHAN_WIDTH_40:
2661 bw = "40Mhz";
2662 break;
2663 case RATE_MCS_CHAN_WIDTH_80:
2664 bw = "80Mhz";
2665 break;
2666 case RATE_MCS_CHAN_WIDTH_160:
2667 bw = "160Mhz";
2668 break;
2669 default:
2670 bw = "BAD BW";
2671 }
2672
2673 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
5aa33553 2674 type, rs_pretty_ant(ant), bw, mcs, nss,
1a61b347 2675 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
7b1dd048 2676 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
1a61b347
ES		 2677 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2678 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2679 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2680}
2681
a0c38b21
ES		 2682/**
2683 * Program the device to use fixed rate for frame transmit
2684 * This is for debugging/testing only
2685 * once the device start use fixed rate, we need to reload the module
2686 * to being back the normal operation.
2687 */
2688static void rs_program_fix_rate(struct iwl_mvm *mvm,
2689 struct iwl_lq_sta *lq_sta)
2690{
2691 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2692 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2693 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2694
2695 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
2696 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2697
2698 if (lq_sta->dbg_fixed_rate) {
8fc7c58c
ES		 2699 struct rs_rate rate;
2700 rs_rate_from_ucode_rate(lq_sta->dbg_fixed_rate,
2701 lq_sta->band, &rate);
80e9e5cd 2702 rs_fill_lq_cmd(mvm, NULL, lq_sta, &rate);
a0c38b21
ES		 2703 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
2704 }
2705}
2706
9d10849e
EG		 2707static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2708 const char __user *user_buf, size_t count, loff_t *ppos)
2709{
2710 struct iwl_lq_sta *lq_sta = file->private_data;
2711 struct iwl_mvm *mvm;
2712 char buf[64];
2713 size_t buf_size;
2714 u32 parsed_rate;
2715
2716
2717 mvm = lq_sta->drv;
2718 memset(buf, 0, sizeof(buf));
2719 buf_size = min(count, sizeof(buf) - 1);
2720 if (copy_from_user(buf, user_buf, buf_size))
2721 return -EFAULT;
2722
2723 if (sscanf(buf, "%x", &parsed_rate) == 1)
2724 lq_sta->dbg_fixed_rate = parsed_rate;
2725 else
2726 lq_sta->dbg_fixed_rate = 0;
2727
2728 rs_program_fix_rate(mvm, lq_sta);
2729
2730 return count;
2731}
2732
8ca151b5
JB		 2733static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2734 char __user *user_buf, size_t count, loff_t *ppos)
2735{
2736 char *buff;
2737 int desc = 0;
2738 int i = 0;
8ca151b5
JB		 2739 ssize_t ret;
2740
2741 struct iwl_lq_sta *lq_sta = file->private_data;
2742 struct iwl_mvm *mvm;
2743 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 2744 struct rs_rate *rate = &tbl->rate;
8ca151b5 2745 mvm = lq_sta->drv;
1a61b347 2746 buff = kmalloc(2048, GFP_KERNEL);
8ca151b5
JB		 2747 if (!buff)
2748 return -ENOMEM;
2749
2750 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2751 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2752 lq_sta->total_failed, lq_sta->total_success,
2753 lq_sta->active_legacy_rate);
2754 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2755 lq_sta->dbg_fixed_rate);
2756 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
4ed735e7
JB		 2757 (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
2758 (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
2759 (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
8ca151b5 2760 desc += sprintf(buff+desc, "lq type %s\n",
5aa33553
ES		 2761 (is_legacy(rate)) ? "legacy" :
2762 is_vht(rate) ? "VHT" : "HT");
2763 if (!is_legacy(rate)) {
8ca151b5 2764 desc += sprintf(buff+desc, " %s",
5aa33553 2765 (is_siso(rate)) ? "SISO" : "MIMO2");
8ca151b5 2766 desc += sprintf(buff+desc, " %s",
5aa33553
ES		 2767 (is_ht20(rate)) ? "20MHz" :
2768 (is_ht40(rate)) ? "40MHz" :
2769 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
6a524f48 2770 desc += sprintf(buff+desc, " %s %s\n",
5aa33553 2771 (rate->sgi) ? "SGI" : "NGI",
6a524f48 2772 (lq_sta->is_agg) ? "AGG on" : "");
8ca151b5
JB		 2773 }
2774 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2775 lq_sta->last_rate_n_flags);
2776 desc += sprintf(buff+desc,
1a61b347 2777 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
8ca151b5
JB		 2778 lq_sta->lq.flags,
2779 lq_sta->lq.mimo_delim,
2780 lq_sta->lq.single_stream_ant_msk,
2781 lq_sta->lq.dual_stream_ant_msk);
2782
2783 desc += sprintf(buff+desc,
2784 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2785 le16_to_cpu(lq_sta->lq.agg_time_limit),
2786 lq_sta->lq.agg_disable_start_th,
2787 lq_sta->lq.agg_frame_cnt_limit);
2788
2789 desc += sprintf(buff+desc,
2790 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2791 lq_sta->lq.initial_rate_index[0],
2792 lq_sta->lq.initial_rate_index[1],
2793 lq_sta->lq.initial_rate_index[2],
2794 lq_sta->lq.initial_rate_index[3]);
2795
2796 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
cf4ef654 2797 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
1a61b347 2798
cf4ef654
JB		 2799 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
2800 desc += rs_pretty_print_rate(buff+desc, r);
8ca151b5
JB		 2801 }
2802
2803 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2804 kfree(buff);
2805 return ret;
2806}
2807
2808static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2809 .write = rs_sta_dbgfs_scale_table_write,
2810 .read = rs_sta_dbgfs_scale_table_read,
2811 .open = simple_open,
2812 .llseek = default_llseek,
2813};
2814static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2815 char __user *user_buf, size_t count, loff_t *ppos)
2816{
2817 char *buff;
2818 int desc = 0;
2819 int i, j;
2820 ssize_t ret;
d310e405 2821 struct iwl_scale_tbl_info *tbl;
5aa33553 2822 struct rs_rate *rate;
8ca151b5
JB		 2823 struct iwl_lq_sta *lq_sta = file->private_data;
2824
2825 buff = kmalloc(1024, GFP_KERNEL);
2826 if (!buff)
2827 return -ENOMEM;
2828
2829 for (i = 0; i < LQ_SIZE; i++) {
d310e405 2830 tbl = &(lq_sta->lq_info[i]);
5aa33553 2831 rate = &tbl->rate;
8ca151b5 2832 desc += sprintf(buff+desc,
6a524f48 2833 "%s type=%d SGI=%d BW=%s DUP=0\n"
8fc7c58c 2834 "index=%d\n",
8ca151b5 2835 lq_sta->active_tbl == i ? "*" : "x",
5aa33553
ES		 2836 rate->type,
2837 rate->sgi,
2838 is_ht20(rate) ? "20Mhz" :
2839 is_ht40(rate) ? "40Mhz" :
2840 is_ht80(rate) ? "80Mhz" : "ERR",
8fc7c58c 2841 rate->index);
8ca151b5
JB		 2842 for (j = 0; j < IWL_RATE_COUNT; j++) {
2843 desc += sprintf(buff+desc,
2844 "counter=%d success=%d %%=%d\n",
d310e405
ES		 2845 tbl->win[j].counter,
2846 tbl->win[j].success_counter,
2847 tbl->win[j].success_ratio);
8ca151b5
JB		 2848 }
2849 }
2850 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2851 kfree(buff);
2852 return ret;
2853}
2854
2855static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2856 .read = rs_sta_dbgfs_stats_table_read,
2857 .open = simple_open,
2858 .llseek = default_llseek,
2859};
2860
8ca151b5
JB		 2861static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2862{
2863 struct iwl_lq_sta *lq_sta = mvm_sta;
2864 lq_sta->rs_sta_dbgfs_scale_table_file =
2865 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2866 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2867 lq_sta->rs_sta_dbgfs_stats_table_file =
2868 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2869 lq_sta, &rs_sta_dbgfs_stats_table_ops);
8ca151b5
JB		 2870 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2871 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2872 &lq_sta->tx_agg_tid_en);
2873}
2874
2875static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2876{
2877 struct iwl_lq_sta *lq_sta = mvm_sta;
2878 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2879 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
8ca151b5
JB		 2880 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2881}
2882#endif
2883
2884/*
2885 * Initialization of rate scaling information is done by driver after
2886 * the station is added. Since mac80211 calls this function before a
2887 * station is added we ignore it.
2888 */
2889static void rs_rate_init_stub(void *mvm_r,
3de805cf
SW		 2890 struct ieee80211_supported_band *sband,
2891 struct cfg80211_chan_def *chandef,
2892 struct ieee80211_sta *sta, void *mvm_sta)
8ca151b5
JB		 2893{
2894}
631ad703
JB		 2895
2896static const struct rate_control_ops rs_mvm_ops = {
8ca151b5
JB		 2897 .name = RS_NAME,
2898 .tx_status = rs_tx_status,
2899 .get_rate = rs_get_rate,
2900 .rate_init = rs_rate_init_stub,
2901 .alloc = rs_alloc,
2902 .free = rs_free,
2903 .alloc_sta = rs_alloc_sta,
2904 .free_sta = rs_free_sta,
b87c2179 2905 .rate_update = rs_rate_update,
8ca151b5
JB		 2906#ifdef CONFIG_MAC80211_DEBUGFS
2907 .add_sta_debugfs = rs_add_debugfs,
2908 .remove_sta_debugfs = rs_remove_debugfs,
2909#endif
2910};
2911
2912int iwl_mvm_rate_control_register(void)
2913{
2914 return ieee80211_rate_control_register(&rs_mvm_ops);
2915}
2916
2917void iwl_mvm_rate_control_unregister(void)
2918{
2919 ieee80211_rate_control_unregister(&rs_mvm_ops);
2920}
9ee718aa
EL		 2921
2922/**
2923 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2924 * Tx protection, according to this rquest and previous requests,
2925 * and send the LQ command.
9ee718aa
EL		 2926 * @mvmsta: The station
2927 * @enable: Enable Tx protection?
2928 */
e126b5d9
JB		 2929int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2930 bool enable)
9ee718aa 2931{
e126b5d9
JB		 2932 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2933
9ee718aa
EL		 2934 lockdep_assert_held(&mvm->mutex);
2935
2936 if (enable) {
2937 if (mvmsta->tx_protection == 0)
d307ec8d 2938 lq->flags |= LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 2939 mvmsta->tx_protection++;
2940 } else {
2941 mvmsta->tx_protection--;
2942 if (mvmsta->tx_protection == 0)
d307ec8d 2943 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 2944 }
2945
9e680946 2946 return iwl_mvm_send_lq_cmd(mvm, lq, false);
9ee718aa 2947}
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