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iwlwifi: mvm: Reflect GO channel switch in NoA
[deliverable/linux.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 61#define RS_STAY_IN_COLUMN_TIMEOUT (5*HZ)
87d5e415 62#define RS_IDLE_TIMEOUT (5*HZ)
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
fd7dbee5 145#define MAX_NEXT_COLUMNS 7
b3b06a32
ES		 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,
31b20452 214 RS_COLUMN_MIMO2,
d8fff919
ES		 215 RS_COLUMN_INVALID,
216 RS_COLUMN_INVALID,
fd7dbee5
ES		 217 RS_COLUMN_INVALID,
218 RS_COLUMN_INVALID,
b3b06a32
ES		 219 },
220 },
221 [RS_COLUMN_LEGACY_ANT_B] = {
222 .mode = RS_LEGACY,
223 .ant = ANT_B,
224 .next_columns = {
225 RS_COLUMN_LEGACY_ANT_A,
226 RS_COLUMN_SISO_ANT_B,
31b20452 227 RS_COLUMN_MIMO2,
d8fff919
ES		 228 RS_COLUMN_INVALID,
229 RS_COLUMN_INVALID,
fd7dbee5
ES		 230 RS_COLUMN_INVALID,
231 RS_COLUMN_INVALID,
b3b06a32
ES		 232 },
233 },
234 [RS_COLUMN_SISO_ANT_A] = {
235 .mode = RS_SISO,
236 .ant = ANT_A,
237 .next_columns = {
238 RS_COLUMN_SISO_ANT_B,
239 RS_COLUMN_MIMO2,
240 RS_COLUMN_SISO_ANT_A_SGI,
fd7dbee5
ES		 241 RS_COLUMN_LEGACY_ANT_A,
242 RS_COLUMN_LEGACY_ANT_B,
d8fff919 243 RS_COLUMN_INVALID,
31b20452 244 RS_COLUMN_INVALID,
b3b06a32
ES		 245 },
246 .checks = {
247 rs_siso_allow,
248 },
249 },
250 [RS_COLUMN_SISO_ANT_B] = {
251 .mode = RS_SISO,
252 .ant = ANT_B,
253 .next_columns = {
254 RS_COLUMN_SISO_ANT_A,
255 RS_COLUMN_MIMO2,
256 RS_COLUMN_SISO_ANT_B_SGI,
fd7dbee5
ES		 257 RS_COLUMN_LEGACY_ANT_A,
258 RS_COLUMN_LEGACY_ANT_B,
d8fff919 259 RS_COLUMN_INVALID,
31b20452 260 RS_COLUMN_INVALID,
b3b06a32
ES		 261 },
262 .checks = {
263 rs_siso_allow,
264 },
265 },
266 [RS_COLUMN_SISO_ANT_A_SGI] = {
267 .mode = RS_SISO,
268 .ant = ANT_A,
269 .sgi = true,
270 .next_columns = {
271 RS_COLUMN_SISO_ANT_B_SGI,
272 RS_COLUMN_MIMO2_SGI,
273 RS_COLUMN_SISO_ANT_A,
fd7dbee5
ES		 274 RS_COLUMN_LEGACY_ANT_A,
275 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 276 RS_COLUMN_INVALID,
277 RS_COLUMN_INVALID,
b3b06a32
ES		 278 },
279 .checks = {
280 rs_siso_allow,
281 rs_sgi_allow,
282 },
283 },
284 [RS_COLUMN_SISO_ANT_B_SGI] = {
285 .mode = RS_SISO,
286 .ant = ANT_B,
287 .sgi = true,
288 .next_columns = {
289 RS_COLUMN_SISO_ANT_A_SGI,
290 RS_COLUMN_MIMO2_SGI,
291 RS_COLUMN_SISO_ANT_B,
fd7dbee5
ES		 292 RS_COLUMN_LEGACY_ANT_A,
293 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 294 RS_COLUMN_INVALID,
295 RS_COLUMN_INVALID,
b3b06a32
ES		 296 },
297 .checks = {
298 rs_siso_allow,
299 rs_sgi_allow,
300 },
301 },
302 [RS_COLUMN_MIMO2] = {
303 .mode = RS_MIMO2,
304 .ant = ANT_AB,
305 .next_columns = {
306 RS_COLUMN_SISO_ANT_A,
307 RS_COLUMN_MIMO2_SGI,
fd7dbee5
ES		 308 RS_COLUMN_LEGACY_ANT_A,
309 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 310 RS_COLUMN_INVALID,
311 RS_COLUMN_INVALID,
312 RS_COLUMN_INVALID,
b3b06a32
ES		 313 },
314 .checks = {
315 rs_mimo_allow,
316 },
317 },
318 [RS_COLUMN_MIMO2_SGI] = {
319 .mode = RS_MIMO2,
320 .ant = ANT_AB,
321 .sgi = true,
322 .next_columns = {
323 RS_COLUMN_SISO_ANT_A_SGI,
324 RS_COLUMN_MIMO2,
fd7dbee5
ES		 325 RS_COLUMN_LEGACY_ANT_A,
326 RS_COLUMN_LEGACY_ANT_B,
31b20452
ES		 327 RS_COLUMN_INVALID,
328 RS_COLUMN_INVALID,
329 RS_COLUMN_INVALID,
b3b06a32
ES		 330 },
331 .checks = {
332 rs_mimo_allow,
333 rs_sgi_allow,
334 },
335 },
336};
337
8ca151b5
JB		 338static inline u8 rs_extract_rate(u32 rate_n_flags)
339{
340 /* also works for HT because bits 7:6 are zero there */
341 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
342}
343
344static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
345{
346 int idx = 0;
347
8ca151b5 348 if (rate_n_flags & RATE_MCS_HT_MSK) {
d310e405
ES		 349 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
350 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 351
d310e405 352 /* skip 9M not supported in HT*/
8ca151b5
JB		 353 if (idx >= IWL_RATE_9M_INDEX)
354 idx += 1;
4e82dd3a 355 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
8ca151b5 356 return idx;
d310e405
ES		 357 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
358 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
359 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 360
d310e405
ES		 361 /* skip 9M not supported in VHT*/
362 if (idx >= IWL_RATE_9M_INDEX)
363 idx++;
364 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
365 return idx;
8ca151b5 366 } else {
d310e405
ES		 367 /* legacy rate format, search for match in table */
368
369 u8 legacy_rate = rs_extract_rate(rate_n_flags);
8ca151b5 370 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
d310e405 371 if (iwl_rates[idx].plcp == legacy_rate)
8ca151b5
JB		 372 return idx;
373 }
374
560843f4 375 return IWL_RATE_INVALID;
8ca151b5
JB		 376}
377
378static void rs_rate_scale_perform(struct iwl_mvm *mvm,
379 struct sk_buff *skb,
380 struct ieee80211_sta *sta,
381 struct iwl_lq_sta *lq_sta);
8fc7c58c
ES		 382static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
383 struct ieee80211_sta *sta,
384 struct iwl_lq_sta *lq_sta,
385 const struct rs_rate *initial_rate);
8ca151b5 386static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
8ca151b5 387
8ca151b5
JB		 388/**
389 * The following tables contain the expected throughput metrics for all rates
390 *
391 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
392 *
393 * where invalid entries are zeros.
394 *
395 * CCK rates are only valid in legacy table and will only be used in G
396 * (2.4 GHz) band.
397 */
398
a34529e8 399static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
4e82dd3a 400 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
8ca151b5
JB		 401};
402
4e82dd3a
ES		 403/* Expected TpT tables. 4 indexes:
404 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
405 */
a34529e8 406static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 407 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
408 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
409 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
410 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
8ca151b5
JB		 411};
412
a34529e8 413static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 414 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
415 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
416 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
417 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
8ca151b5
JB		 418};
419
a34529e8 420static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 421 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
422 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
423 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
424 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
425};
426
a34529e8 427static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 428 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
429 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
430 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
431 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
8ca151b5
JB		 432};
433
a34529e8 434static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 435 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
436 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
437 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
438 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
8ca151b5
JB		 439};
440
a34529e8 441static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
d310e405
ES		 442 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
443 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
444 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
445 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
446};
447
8ca151b5
JB		 448/* mbps, mcs */
449static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
450 { "1", "BPSK DSSS"},
451 { "2", "QPSK DSSS"},
452 {"5.5", "BPSK CCK"},
453 { "11", "QPSK CCK"},
454 { "6", "BPSK 1/2"},
455 { "9", "BPSK 1/2"},
456 { "12", "QPSK 1/2"},
457 { "18", "QPSK 3/4"},
458 { "24", "16QAM 1/2"},
459 { "36", "16QAM 3/4"},
460 { "48", "64QAM 2/3"},
461 { "54", "64QAM 3/4"},
462 { "60", "64QAM 5/6"},
463};
464
465#define MCS_INDEX_PER_STREAM (8)
466
9d10849e
EG		 467static const char *rs_pretty_ant(u8 ant)
468{
469 static const char * const ant_name[] = {
470 [ANT_NONE] = "None",
471 [ANT_A] = "A",
472 [ANT_B] = "B",
473 [ANT_AB] = "AB",
474 [ANT_C] = "C",
475 [ANT_AC] = "AC",
476 [ANT_BC] = "BC",
477 [ANT_ABC] = "ABC",
478 };
479
480 if (ant > ANT_ABC)
481 return "UNKNOWN";
482
483 return ant_name[ant];
484}
485
486static const char *rs_pretty_lq_type(enum iwl_table_type type)
487{
488 static const char * const lq_types[] = {
489 [LQ_NONE] = "NONE",
490 [LQ_LEGACY_A] = "LEGACY_A",
491 [LQ_LEGACY_G] = "LEGACY_G",
492 [LQ_HT_SISO] = "HT SISO",
493 [LQ_HT_MIMO2] = "HT MIMO",
494 [LQ_VHT_SISO] = "VHT SISO",
495 [LQ_VHT_MIMO2] = "VHT MIMO",
496 };
497
498 if (type < LQ_NONE || type >= LQ_MAX)
499 return "UNKNOWN";
500
501 return lq_types[type];
502}
503
5aa33553
ES		 504static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
505 const char *prefix)
506{
507 IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
508 prefix, rs_pretty_lq_type(rate->type),
509 rate->index, rs_pretty_ant(rate->ant),
510 rate->bw, rate->sgi);
511}
512
8ca151b5
JB		 513static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
514{
515 window->data = 0;
516 window->success_counter = 0;
517 window->success_ratio = IWL_INVALID_VALUE;
518 window->counter = 0;
519 window->average_tpt = IWL_INVALID_VALUE;
8ca151b5
JB		 520}
521
b804eeb6
ES		 522static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
523 struct iwl_scale_tbl_info *tbl)
3ca71f60
EP		 524{
525 int i;
526
b804eeb6 527 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
3ca71f60
EP		 528 for (i = 0; i < IWL_RATE_COUNT; i++)
529 rs_rate_scale_clear_window(&tbl->win[i]);
2fd647f8
EP		 530
531 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
532 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
3ca71f60
EP		 533}
534
8ca151b5
JB		 535static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
536{
537 return (ant_type & valid_antenna) == ant_type;
538}
539
8ca151b5
JB		 540static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
541 struct iwl_lq_sta *lq_data, u8 tid,
542 struct ieee80211_sta *sta)
543{
544 int ret = -EAGAIN;
8ca151b5 545
44cc429c
EG		 546 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
547 sta->addr, tid);
548 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
549 if (ret == -EAGAIN) {
550 /*
551 * driver and mac80211 is out of sync
552 * this might be cause by reloading firmware
553 * stop the tx ba session here
554 */
555 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
556 tid);
557 ieee80211_stop_tx_ba_session(sta, tid);
8ca151b5
JB		 558 }
559 return ret;
560}
561
562static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
563 struct iwl_lq_sta *lq_data,
564 struct ieee80211_sta *sta)
565{
566 if (tid < IWL_MAX_TID_COUNT)
567 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
568 else
569 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
570 tid, IWL_MAX_TID_COUNT);
571}
572
573static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
574{
575 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
576 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
577 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
578}
579
580/*
581 * Static function to get the expected throughput from an iwl_scale_tbl_info
582 * that wraps a NULL pointer check
583 */
584static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
585{
586 if (tbl->expected_tpt)
587 return tbl->expected_tpt[rs_index];
588 return 0;
589}
590
591/**
592 * rs_collect_tx_data - Update the success/failure sliding window
593 *
594 * We keep a sliding window of the last 62 packets transmitted
595 * at this rate. window->data contains the bitmask of successful
596 * packets.
597 */
0bd3c5a7
EP		 598static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
599 int scale_index, int attempts, int successes,
600 struct iwl_rate_scale_data *window)
8ca151b5 601{
8ca151b5
JB		 602 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
603 s32 fail_count, tpt;
604
8ca151b5
JB		 605 /* Get expected throughput */
606 tpt = get_expected_tpt(tbl, scale_index);
607
608 /*
609 * Keep track of only the latest 62 tx frame attempts in this rate's
610 * history window; anything older isn't really relevant any more.
611 * If we have filled up the sliding window, drop the oldest attempt;
612 * if the oldest attempt (highest bit in bitmap) shows "success",
613 * subtract "1" from the success counter (this is the main reason
614 * we keep these bitmaps!).
615 */
616 while (attempts > 0) {
617 if (window->counter >= IWL_RATE_MAX_WINDOW) {
618 /* remove earliest */
619 window->counter = IWL_RATE_MAX_WINDOW - 1;
620
621 if (window->data & mask) {
622 window->data &= ~mask;
623 window->success_counter--;
624 }
625 }
626
627 /* Increment frames-attempted counter */
628 window->counter++;
629
630 /* Shift bitmap by one frame to throw away oldest history */
631 window->data <<= 1;
632
633 /* Mark the most recent #successes attempts as successful */
634 if (successes > 0) {
635 window->success_counter++;
636 window->data |= 0x1;
637 successes--;
638 }
639
640 attempts--;
641 }
642
643 /* Calculate current success ratio, avoid divide-by-0! */
644 if (window->counter > 0)
645 window->success_ratio = 128 * (100 * window->success_counter)
646 / window->counter;
647 else
648 window->success_ratio = IWL_INVALID_VALUE;
649
650 fail_count = window->counter - window->success_counter;
651
652 /* Calculate average throughput, if we have enough history. */
653 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
654 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
655 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
656 else
657 window->average_tpt = IWL_INVALID_VALUE;
658
8ca151b5
JB		 659 return 0;
660}
661
757cf23b
ES		 662static int rs_collect_tx_data(struct iwl_lq_sta *lq_sta,
663 struct iwl_scale_tbl_info *tbl,
2fd647f8
EP		 664 int scale_index, int attempts, int successes,
665 u8 reduced_txp)
0bd3c5a7
EP		 666{
667 struct iwl_rate_scale_data *window = NULL;
2fd647f8 668 int ret;
0bd3c5a7
EP		 669
670 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
671 return -EINVAL;
672
757cf23b
ES		 673 if (tbl->column != RS_COLUMN_INVALID) {
674 lq_sta->tx_stats[tbl->column][scale_index].total += attempts;
675 lq_sta->tx_stats[tbl->column][scale_index].success += successes;
676 }
677
0bd3c5a7
EP		 678 /* Select window for current tx bit rate */
679 window = &(tbl->win[scale_index]);
680
2fd647f8
EP		 681 ret = _rs_collect_tx_data(tbl, scale_index, attempts, successes,
682 window);
683 if (ret)
684 return ret;
685
686 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
687 return -EINVAL;
688
689 window = &tbl->tpc_win[reduced_txp];
0bd3c5a7
EP		 690 return _rs_collect_tx_data(tbl, scale_index, attempts, successes,
691 window);
692}
693
5aa33553
ES		 694/* Convert rs_rate object into ucode rate bitmask */
695static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
8fc7c58c 696 struct rs_rate *rate)
8ca151b5 697{
5aa33553
ES		 698 u32 ucode_rate = 0;
699 int index = rate->index;
8ca151b5 700
5aa33553 701 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
d310e405
ES		 702 RATE_MCS_ANT_ABC_MSK);
703
5aa33553
ES		 704 if (is_legacy(rate)) {
705 ucode_rate |= iwl_rates[index].plcp;
8ca151b5 706 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
5aa33553
ES		 707 ucode_rate |= RATE_MCS_CCK_MSK;
708 return ucode_rate;
d310e405
ES		 709 }
710
5aa33553 711 if (is_ht(rate)) {
d310e405 712 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
8ca151b5 713 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
4e82dd3a 714 index = IWL_LAST_HT_RATE;
8ca151b5 715 }
5aa33553 716 ucode_rate |= RATE_MCS_HT_MSK;
8ca151b5 717
5aa33553
ES		 718 if (is_ht_siso(rate))
719 ucode_rate |= iwl_rates[index].plcp_ht_siso;
720 else if (is_ht_mimo2(rate))
721 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
8ca151b5 722 else
d972ab31 723 WARN_ON_ONCE(1);
5aa33553 724 } else if (is_vht(rate)) {
d310e405
ES		 725 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
726 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
727 index = IWL_LAST_VHT_RATE;
728 }
5aa33553
ES		 729 ucode_rate |= RATE_MCS_VHT_MSK;
730 if (is_vht_siso(rate))
731 ucode_rate |= iwl_rates[index].plcp_vht_siso;
732 else if (is_vht_mimo2(rate))
733 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
d310e405
ES		 734 else
735 WARN_ON_ONCE(1);
736
8ca151b5 737 } else {
5aa33553 738 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
8ca151b5
JB		 739 }
740
5aa33553
ES		 741 ucode_rate |= rate->bw;
742 if (rate->sgi)
743 ucode_rate |= RATE_MCS_SGI_MSK;
d310e405 744
5aa33553 745 return ucode_rate;
8ca151b5
JB		 746}
747
5aa33553
ES		 748/* Convert a ucode rate into an rs_rate object */
749static int rs_rate_from_ucode_rate(const u32 ucode_rate,
750 enum ieee80211_band band,
751 struct rs_rate *rate)
8ca151b5 752{
5aa33553
ES		 753 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
754 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
d310e405 755 u8 nss;
8ca151b5 756
9e898f1b 757 memset(rate, 0, sizeof(*rate));
5aa33553 758 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
8ca151b5 759
560843f4 760 if (rate->index == IWL_RATE_INVALID)
8ca151b5 761 return -EINVAL;
5aa33553
ES		 762
763 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
8ca151b5 764
d310e405 765 /* Legacy */
5aa33553
ES		 766 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
767 !(ucode_rate & RATE_MCS_VHT_MSK)) {
8ca151b5
JB		 768 if (num_of_ant == 1) {
769 if (band == IEEE80211_BAND_5GHZ)
5aa33553 770 rate->type = LQ_LEGACY_A;
8ca151b5 771 else
5aa33553 772 rate->type = LQ_LEGACY_G;
8ca151b5 773 }
d310e405
ES		 774
775 return 0;
776 }
777
778 /* HT or VHT */
5aa33553
ES		 779 if (ucode_rate & RATE_MCS_SGI_MSK)
780 rate->sgi = true;
d310e405 781
5aa33553 782 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
d310e405 783
5aa33553
ES		 784 if (ucode_rate & RATE_MCS_HT_MSK) {
785 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
d310e405
ES		 786 RATE_HT_MCS_NSS_POS) + 1;
787
788 if (nss == 1) {
5aa33553 789 rate->type = LQ_HT_SISO;
d310e405
ES		 790 WARN_ON_ONCE(num_of_ant != 1);
791 } else if (nss == 2) {
5aa33553 792 rate->type = LQ_HT_MIMO2;
d310e405 793 WARN_ON_ONCE(num_of_ant != 2);
8ca151b5 794 } else {
d310e405
ES		 795 WARN_ON_ONCE(1);
796 }
5aa33553
ES		 797 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
798 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
d310e405
ES		 799 RATE_VHT_MCS_NSS_POS) + 1;
800
801 if (nss == 1) {
5aa33553 802 rate->type = LQ_VHT_SISO;
d310e405
ES		 803 WARN_ON_ONCE(num_of_ant != 1);
804 } else if (nss == 2) {
5aa33553 805 rate->type = LQ_VHT_MIMO2;
d310e405
ES		 806 WARN_ON_ONCE(num_of_ant != 2);
807 } else {
808 WARN_ON_ONCE(1);
8ca151b5
JB		 809 }
810 }
d310e405 811
5aa33553
ES		 812 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
813 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
814 !is_vht(rate));
d310e405 815
8ca151b5
JB		 816 return 0;
817}
818
819/* switch to another antenna/antennas and return 1 */
820/* if no other valid antenna found, return 0 */
8fc7c58c 821static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
8ca151b5
JB		 822{
823 u8 new_ant_type;
824
5aa33553 825 if (!rate->ant || rate->ant > ANT_ABC)
8ca151b5
JB		 826 return 0;
827
5aa33553 828 if (!rs_is_valid_ant(valid_ant, rate->ant))
8ca151b5
JB		 829 return 0;
830
5aa33553 831 new_ant_type = ant_toggle_lookup[rate->ant];
8ca151b5 832
5aa33553 833 while ((new_ant_type != rate->ant) &&
8ca151b5
JB		 834 !rs_is_valid_ant(valid_ant, new_ant_type))
835 new_ant_type = ant_toggle_lookup[new_ant_type];
836
5aa33553 837 if (new_ant_type == rate->ant)
8ca151b5
JB		 838 return 0;
839
5aa33553
ES		 840 rate->ant = new_ant_type;
841
8ca151b5
JB		 842 return 1;
843}
844
8ca151b5 845static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
5aa33553 846 struct rs_rate *rate)
8ca151b5 847{
5aa33553 848 if (is_legacy(rate))
8ca151b5 849 return lq_sta->active_legacy_rate;
5aa33553 850 else if (is_siso(rate))
d310e405 851 return lq_sta->active_siso_rate;
5aa33553 852 else if (is_mimo2(rate))
d310e405
ES		 853 return lq_sta->active_mimo2_rate;
854
855 WARN_ON_ONCE(1);
856 return 0;
8ca151b5
JB		 857}
858
859static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
860 int rate_type)
861{
862 u8 high = IWL_RATE_INVALID;
863 u8 low = IWL_RATE_INVALID;
864
865 /* 802.11A or ht walks to the next literal adjacent rate in
866 * the rate table */
5aa33553 867 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
8ca151b5
JB		 868 int i;
869 u32 mask;
870
871 /* Find the previous rate that is in the rate mask */
872 i = index - 1;
873 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
874 if (rate_mask & mask) {
875 low = i;
876 break;
877 }
878 }
879
880 /* Find the next rate that is in the rate mask */
881 i = index + 1;
882 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
883 if (rate_mask & mask) {
884 high = i;
885 break;
886 }
887 }
888
889 return (high << 8) | low;
890 }
891
892 low = index;
893 while (low != IWL_RATE_INVALID) {
894 low = iwl_rates[low].prev_rs;
895 if (low == IWL_RATE_INVALID)
896 break;
897 if (rate_mask & (1 << low))
898 break;
899 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
900 }
901
902 high = index;
903 while (high != IWL_RATE_INVALID) {
904 high = iwl_rates[high].next_rs;
905 if (high == IWL_RATE_INVALID)
906 break;
907 if (rate_mask & (1 << high))
908 break;
909 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
910 }
911
912 return (high << 8) | low;
913}
914
e07be6d3
ES		 915static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
916 struct rs_rate *rate)
8ca151b5 917{
e07be6d3
ES		 918 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
919}
920
921/* Get the next supported lower rate in the current column.
922 * Return true if bottom rate in the current column was reached
923 */
924static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
925 struct rs_rate *rate)
926{
927 u8 low;
8ca151b5 928 u16 high_low;
e07be6d3 929 u16 rate_mask;
ae969afe 930 struct iwl_mvm *mvm = lq_sta->pers.drv;
e07be6d3
ES		 931
932 rate_mask = rs_get_supported_rates(lq_sta, rate);
933 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
934 rate->type);
935 low = high_low & 0xff;
936
937 /* Bottom rate of column reached */
938 if (low == IWL_RATE_INVALID)
939 return true;
940
941 rate->index = low;
942 return false;
943}
944
945/* Get the next rate to use following a column downgrade */
946static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
947 struct rs_rate *rate)
948{
ae969afe 949 struct iwl_mvm *mvm = lq_sta->pers.drv;
8ca151b5 950
e07be6d3
ES		 951 if (is_legacy(rate)) {
952 /* No column to downgrade from Legacy */
953 return;
954 } else if (is_siso(rate)) {
955 /* Downgrade to Legacy if we were in SISO */
8ca151b5 956 if (lq_sta->band == IEEE80211_BAND_5GHZ)
5aa33553 957 rate->type = LQ_LEGACY_A;
8ca151b5 958 else
5aa33553 959 rate->type = LQ_LEGACY_G;
8ca151b5 960
a56db7d1 961 rate->bw = RATE_MCS_CHAN_WIDTH_20;
8ca151b5 962
b800040d 963 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
e07be6d3 964 rate->index > IWL_RATE_MCS_9_INDEX);
8ca151b5 965
e07be6d3
ES		 966 rate->index = rs_ht_to_legacy[rate->index];
967 } else {
968 /* Downgrade to SISO with same MCS if in MIMO */
969 rate->type = is_vht_mimo2(rate) ?
970 LQ_VHT_SISO : LQ_HT_SISO;
8ca151b5
JB		 971 }
972
8ca151b5 973
e07be6d3 974 if (num_of_ant(rate->ant) > 1)
4ed735e7 975 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
8ca151b5 976
e07be6d3
ES		 977 /* Relevant in both switching to SISO or Legacy */
978 rate->sgi = false;
979
980 if (!rs_rate_supported(lq_sta, rate))
981 rs_get_lower_rate_in_column(lq_sta, rate);
8ca151b5
JB		 982}
983
5aa33553
ES		 984/* Simple function to compare two rate scale table types */
985static inline bool rs_rate_match(struct rs_rate *a,
986 struct rs_rate *b)
8ca151b5 987{
5aa33553 988 return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
8ca151b5
JB		 989}
990
d310e405
ES		 991static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
992{
993 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
994 return RATE_MCS_CHAN_WIDTH_40;
995 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
996 return RATE_MCS_CHAN_WIDTH_80;
997 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
998 return RATE_MCS_CHAN_WIDTH_160;
999
1000 return RATE_MCS_CHAN_WIDTH_20;
1001}
1002
8ca151b5
JB		 1003/*
1004 * mac80211 sends us Tx status
1005 */
1006static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
1007 struct ieee80211_sta *sta, void *priv_sta,
1008 struct sk_buff *skb)
1009{
1010 int legacy_success;
1011 int retries;
5aa33553 1012 int mac_index, i;
8ca151b5
JB		 1013 struct iwl_lq_sta *lq_sta = priv_sta;
1014 struct iwl_lq_cmd *table;
1015 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1016 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1017 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1018 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1019 enum mac80211_rate_control_flags mac_flags;
5aa33553
ES		 1020 u32 ucode_rate;
1021 struct rs_rate rate;
8ca151b5 1022 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
2fd647f8 1023 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
8ca151b5 1024
8ca151b5
JB		 1025 /* Treat uninitialized rate scaling data same as non-existing. */
1026 if (!lq_sta) {
1027 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1028 return;
ae969afe 1029 } else if (!lq_sta->pers.drv) {
8ca151b5
JB		 1030 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1031 return;
1032 }
1033
8e96440e 1034#ifdef CONFIG_MAC80211_DEBUGFS
87d5e415 1035 /* Disable last tx check if we are debugging with fixed rate */
ae969afe 1036 if (lq_sta->pers.dbg_fixed_rate) {
87d5e415
ES		 1037 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1038 return;
1039 }
1040#endif
8ca151b5
JB		 1041 if (!ieee80211_is_data(hdr->frame_control) ||
1042 info->flags & IEEE80211_TX_CTL_NO_ACK)
1043 return;
1044
1045 /* This packet was aggregated but doesn't carry status info */
1046 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1047 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1048 return;
1049
1050 /*
1051 * Ignore this Tx frame response if its initial rate doesn't match
1052 * that of latest Link Quality command. There may be stragglers
1053 * from a previous Link Quality command, but we're no longer interested
1054 * in those; they're either from the "active" mode while we're trying
1055 * to check "search" mode, or a prior "search" mode after we've moved
1056 * to a new "search" mode (which might become the new "active" mode).
1057 */
1058 table = &lq_sta->lq;
5aa33553
ES		 1059 ucode_rate = le32_to_cpu(table->rs_table[0]);
1060 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5 1061 if (info->band == IEEE80211_BAND_5GHZ)
5aa33553 1062 rate.index -= IWL_FIRST_OFDM_RATE;
8ca151b5
JB		 1063 mac_flags = info->status.rates[0].flags;
1064 mac_index = info->status.rates[0].idx;
1065 /* For HT packets, map MCS to PLCP */
1066 if (mac_flags & IEEE80211_TX_RC_MCS) {
1067 /* Remove # of streams */
1068 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1069 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1070 mac_index++;
1071 /*
1072 * mac80211 HT index is always zero-indexed; we need to move
1073 * HT OFDM rates after CCK rates in 2.4 GHz band
1074 */
1075 if (info->band == IEEE80211_BAND_2GHZ)
1076 mac_index += IWL_FIRST_OFDM_RATE;
d310e405
ES		 1077 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1078 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1079 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1080 mac_index++;
8ca151b5 1081 }
d310e405 1082
87d5e415
ES		 1083 if (time_after(jiffies,
1084 (unsigned long)(lq_sta->last_tx + RS_IDLE_TIMEOUT))) {
1085 int tid;
1086 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1087 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
1088 ieee80211_stop_tx_ba_session(sta, tid);
1089
1090 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
1091 return;
1092 }
1093 lq_sta->last_tx = jiffies;
1094
8ca151b5
JB		 1095 /* Here we actually compare this rate to the latest LQ command */
1096 if ((mac_index < 0) ||
5aa33553
ES		 1097 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1098 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1099 (rate.ant != info->status.antenna) ||
1100 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
d310e405 1101 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
5aa33553 1102 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
d310e405 1103 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
5aa33553 1104 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
d310e405 1105 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
5aa33553 1106 (rate.index != mac_index)) {
8ca151b5
JB		 1107 IWL_DEBUG_RATE(mvm,
1108 "initial rate %d does not match %d (0x%x)\n",
5aa33553 1109 mac_index, rate.index, ucode_rate);
8ca151b5
JB		 1110 /*
1111 * Since rates mis-match, the last LQ command may have failed.
1112 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1113 * ... driver.
1114 */
1115 lq_sta->missed_rate_counter++;
1116 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1117 lq_sta->missed_rate_counter = 0;
b3b06a32
ES		 1118 IWL_DEBUG_RATE(mvm,
1119 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1120 lq_sta->rs_state);
9e680946 1121 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1122 }
1123 /* Regardless, ignore this status info for outdated rate */
1124 return;
1125 } else
1126 /* Rate did match, so reset the missed_rate_counter */
1127 lq_sta->missed_rate_counter = 0;
1128
1129 /* Figure out if rate scale algorithm is in active or search table */
5aa33553
ES		 1130 if (rs_rate_match(&rate,
1131 &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
8ca151b5
JB		 1132 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1133 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553
ES		 1134 } else if (rs_rate_match(&rate,
1135 &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
8ca151b5
JB		 1136 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1137 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1138 } else {
1139 IWL_DEBUG_RATE(mvm,
1140 "Neither active nor search matches tx rate\n");
1141 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 1142 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
8ca151b5 1143 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553
ES		 1144 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1145 rs_dump_rate(mvm, &rate, "ACTUAL");
1146
8ca151b5
JB		 1147 /*
1148 * no matching table found, let's by-pass the data collection
1149 * and continue to perform rate scale to find the rate table
1150 */
1151 rs_stay_in_table(lq_sta, true);
1152 goto done;
1153 }
1154
1155 /*
1156 * Updating the frame history depends on whether packets were
1157 * aggregated.
1158 *
1159 * For aggregation, all packets were transmitted at the same rate, the
1160 * first index into rate scale table.
1161 */
1162 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
5aa33553
ES		 1163 ucode_rate = le32_to_cpu(table->rs_table[0]);
1164 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
757cf23b 1165 rs_collect_tx_data(lq_sta, curr_tbl, rate.index,
8ca151b5 1166 info->status.ampdu_len,
2fd647f8
EP		 1167 info->status.ampdu_ack_len,
1168 reduced_txp);
8ca151b5
JB		 1169
1170 /* Update success/fail counts if not searching for new mode */
b3b06a32 1171 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1172 lq_sta->total_success += info->status.ampdu_ack_len;
1173 lq_sta->total_failed += (info->status.ampdu_len -
1174 info->status.ampdu_ack_len);
1175 }
1176 } else {
1177 /*
1178 * For legacy, update frame history with for each Tx retry.
1179 */
1180 retries = info->status.rates[0].count - 1;
1181 /* HW doesn't send more than 15 retries */
1182 retries = min(retries, 15);
1183
1184 /* The last transmission may have been successful */
1185 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1186 /* Collect data for each rate used during failed TX attempts */
1187 for (i = 0; i <= retries; ++i) {
5aa33553
ES		 1188 ucode_rate = le32_to_cpu(table->rs_table[i]);
1189 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5
JB		 1190 /*
1191 * Only collect stats if retried rate is in the same RS
1192 * table as active/search.
1193 */
5aa33553 1194 if (rs_rate_match(&rate, &curr_tbl->rate))
8ca151b5 1195 tmp_tbl = curr_tbl;
5aa33553 1196 else if (rs_rate_match(&rate, &other_tbl->rate))
8ca151b5 1197 tmp_tbl = other_tbl;
4107dbd2 1198 else
8ca151b5 1199 continue;
4107dbd2 1200
757cf23b 1201 rs_collect_tx_data(lq_sta, tmp_tbl, rate.index, 1,
2fd647f8
EP		 1202 i < retries ? 0 : legacy_success,
1203 reduced_txp);
8ca151b5
JB		 1204 }
1205
1206 /* Update success/fail counts if not searching for new mode */
b3b06a32 1207 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1208 lq_sta->total_success += legacy_success;
1209 lq_sta->total_failed += retries + (1 - legacy_success);
1210 }
1211 }
1212 /* The last TX rate is cached in lq_sta; it's set in if/else above */
5aa33553 1213 lq_sta->last_rate_n_flags = ucode_rate;
2fd647f8 1214 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
8ca151b5
JB		 1215done:
1216 /* See if there's a better rate or modulation mode to try. */
1217 if (sta && sta->supp_rates[sband->band])
1218 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1219}
1220
1221/*
1222 * Begin a period of staying with a selected modulation mode.
1223 * Set "stay_in_tbl" flag to prevent any mode switches.
1224 * Set frame tx success limits according to legacy vs. high-throughput,
1225 * and reset overall (spanning all rates) tx success history statistics.
1226 * These control how long we stay using same modulation mode before
1227 * searching for a new mode.
1228 */
1229static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1230 struct iwl_lq_sta *lq_sta)
1231{
b3b06a32
ES		 1232 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1233 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
8ca151b5
JB		 1234 if (is_legacy) {
1235 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1236 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1237 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1238 } else {
1239 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1240 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1241 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1242 }
1243 lq_sta->table_count = 0;
1244 lq_sta->total_failed = 0;
1245 lq_sta->total_success = 0;
1246 lq_sta->flush_timer = jiffies;
b3b06a32 1247 lq_sta->visited_columns = 0;
8ca151b5
JB		 1248}
1249
198266a3
ES		 1250static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1251 const struct rs_tx_column *column)
1252{
1253 switch (column->mode) {
1254 case RS_LEGACY:
1255 return lq_sta->max_legacy_rate_idx;
1256 case RS_SISO:
1257 return lq_sta->max_siso_rate_idx;
1258 case RS_MIMO2:
1259 return lq_sta->max_mimo2_rate_idx;
1260 default:
1261 WARN_ON_ONCE(1);
1262 }
1263
1264 return lq_sta->max_legacy_rate_idx;
1265}
1266
a34529e8 1267static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
198266a3
ES		 1268 const struct rs_tx_column *column,
1269 u32 bw)
8ca151b5
JB		 1270{
1271 /* Used to choose among HT tables */
a34529e8 1272 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
8ca151b5 1273
b3b06a32
ES		 1274 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1275 column->mode != RS_SISO &&
1276 column->mode != RS_MIMO2))
1277 return expected_tpt_legacy;
8ca151b5
JB		 1278
1279 /* Legacy rates have only one table */
b3b06a32
ES		 1280 if (column->mode == RS_LEGACY)
1281 return expected_tpt_legacy;
8ca151b5 1282
d310e405 1283 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
8ca151b5 1284 /* Choose among many HT tables depending on number of streams
d310e405 1285 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
8ca151b5 1286 * status */
b3b06a32
ES		 1287 if (column->mode == RS_SISO) {
1288 switch (bw) {
d310e405
ES		 1289 case RATE_MCS_CHAN_WIDTH_20:
1290 ht_tbl_pointer = expected_tpt_siso_20MHz;
1291 break;
1292 case RATE_MCS_CHAN_WIDTH_40:
1293 ht_tbl_pointer = expected_tpt_siso_40MHz;
1294 break;
1295 case RATE_MCS_CHAN_WIDTH_80:
1296 ht_tbl_pointer = expected_tpt_siso_80MHz;
1297 break;
1298 default:
1299 WARN_ON_ONCE(1);
1300 }
b3b06a32
ES		 1301 } else if (column->mode == RS_MIMO2) {
1302 switch (bw) {
d310e405
ES		 1303 case RATE_MCS_CHAN_WIDTH_20:
1304 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1305 break;
1306 case RATE_MCS_CHAN_WIDTH_40:
1307 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1308 break;
1309 case RATE_MCS_CHAN_WIDTH_80:
1310 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1311 break;
1312 default:
1313 WARN_ON_ONCE(1);
1314 }
1315 } else {
1316 WARN_ON_ONCE(1);
d972ab31 1317 }
8ca151b5 1318
b3b06a32
ES		 1319 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1320 return ht_tbl_pointer[0];
1321 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1322 return ht_tbl_pointer[1];
1323 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1324 return ht_tbl_pointer[2];
8ca151b5 1325 else /* AGG+SGI */
b3b06a32
ES		 1326 return ht_tbl_pointer[3];
1327}
1328
1329static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1330 struct iwl_scale_tbl_info *tbl)
1331{
1332 struct rs_rate *rate = &tbl->rate;
1333 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1334
1335 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
8ca151b5
JB		 1336}
1337
8ca151b5
JB		 1338static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1339 struct iwl_lq_sta *lq_sta,
1340 struct iwl_scale_tbl_info *tbl, /* "search" */
80763515 1341 unsigned long rate_mask, s8 index)
8ca151b5 1342{
8ca151b5
JB		 1343 struct iwl_scale_tbl_info *active_tbl =
1344 &(lq_sta->lq_info[lq_sta->active_tbl]);
80763515
ES		 1345 s32 success_ratio = active_tbl->win[index].success_ratio;
1346 u16 expected_current_tpt = active_tbl->expected_tpt[index];
a34529e8 1347 const u16 *tpt_tbl = tbl->expected_tpt;
8ca151b5 1348 u16 high_low;
80763515
ES		 1349 u32 target_tpt;
1350 int rate_idx;
8ca151b5 1351
80763515
ES		 1352 if (success_ratio > RS_SR_NO_DECREASE) {
1353 target_tpt = 100 * expected_current_tpt;
1354 IWL_DEBUG_RATE(mvm,
1355 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1356 success_ratio, target_tpt);
1357 } else {
1358 target_tpt = lq_sta->last_tpt;
1359 IWL_DEBUG_RATE(mvm,
1360 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1361 success_ratio, target_tpt);
1362 }
8ca151b5 1363
80763515 1364 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
8ca151b5 1365
80763515
ES		 1366 while (rate_idx != IWL_RATE_INVALID) {
1367 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1368 break;
8ca151b5 1369
80763515
ES		 1370 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1371 tbl->rate.type);
8ca151b5 1372
80763515 1373 rate_idx = (high_low >> 8) & 0xff;
8ca151b5
JB		 1374 }
1375
80763515
ES		 1376 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1377 rate_idx, target_tpt,
1378 rate_idx != IWL_RATE_INVALID ?
1379 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1380
1381 return rate_idx;
8ca151b5
JB		 1382}
1383
5aa33553 1384static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
d310e405
ES		 1385{
1386 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
5aa33553 1387 return RATE_MCS_CHAN_WIDTH_80;
d310e405 1388 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
5aa33553
ES		 1389 return RATE_MCS_CHAN_WIDTH_40;
1390
1391 return RATE_MCS_CHAN_WIDTH_20;
d310e405
ES		 1392}
1393
8ca151b5
JB		 1394/*
1395 * Check whether we should continue using same modulation mode, or
1396 * begin search for a new mode, based on:
1397 * 1) # tx successes or failures while using this mode
1398 * 2) # times calling this function
1399 * 3) elapsed time in this mode (not used, for now)
1400 */
1401static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1402{
1403 struct iwl_scale_tbl_info *tbl;
8ca151b5
JB		 1404 int active_tbl;
1405 int flush_interval_passed = 0;
1406 struct iwl_mvm *mvm;
1407
ae969afe 1408 mvm = lq_sta->pers.drv;
8ca151b5
JB		 1409 active_tbl = lq_sta->active_tbl;
1410
1411 tbl = &(lq_sta->lq_info[active_tbl]);
1412
1413 /* If we've been disallowing search, see if we should now allow it */
b3b06a32 1414 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1415 /* Elapsed time using current modulation mode */
1416 if (lq_sta->flush_timer)
1417 flush_interval_passed =
1418 time_after(jiffies,
1419 (unsigned long)(lq_sta->flush_timer +
32b01726 1420 RS_STAY_IN_COLUMN_TIMEOUT));
8ca151b5
JB		 1421
1422 /*
1423 * Check if we should allow search for new modulation mode.
1424 * If many frames have failed or succeeded, or we've used
1425 * this same modulation for a long time, allow search, and
1426 * reset history stats that keep track of whether we should
1427 * allow a new search. Also (below) reset all bitmaps and
1428 * stats in active history.
1429 */
1430 if (force_search ||
1431 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1432 (lq_sta->total_success > lq_sta->max_success_limit) ||
1433 ((!lq_sta->search_better_tbl) &&
1434 (lq_sta->flush_timer) && (flush_interval_passed))) {
1435 IWL_DEBUG_RATE(mvm,
1436 "LQ: stay is expired %d %d %d\n",
1437 lq_sta->total_failed,
1438 lq_sta->total_success,
1439 flush_interval_passed);
1440
1441 /* Allow search for new mode */
b3b06a32
ES		 1442 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1443 IWL_DEBUG_RATE(mvm,
1444 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
8ca151b5
JB		 1445 lq_sta->total_failed = 0;
1446 lq_sta->total_success = 0;
1447 lq_sta->flush_timer = 0;
b3b06a32
ES		 1448 /* mark the current column as visited */
1449 lq_sta->visited_columns = BIT(tbl->column);
8ca151b5
JB		 1450 /*
1451 * Else if we've used this modulation mode enough repetitions
1452 * (regardless of elapsed time or success/failure), reset
1453 * history bitmaps and rate-specific stats for all rates in
1454 * active table.
1455 */
1456 } else {
1457 lq_sta->table_count++;
1458 if (lq_sta->table_count >=
1459 lq_sta->table_count_limit) {
1460 lq_sta->table_count = 0;
1461
1462 IWL_DEBUG_RATE(mvm,
1463 "LQ: stay in table clear win\n");
b804eeb6 1464 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1465 }
1466 }
1467
1468 /* If transitioning to allow "search", reset all history
1469 * bitmaps and stats in active table (this will become the new
1470 * "search" table). */
b3b06a32 1471 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
b804eeb6 1472 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 1473 }
1474 }
1475}
1476
1477/*
1478 * setup rate table in uCode
1479 */
1480static void rs_update_rate_tbl(struct iwl_mvm *mvm,
9145d151 1481 struct ieee80211_sta *sta,
8ca151b5 1482 struct iwl_lq_sta *lq_sta,
5aa33553 1483 struct rs_rate *rate)
8ca151b5 1484{
8fc7c58c 1485 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
9e680946 1486 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1487}
1488
977342bc
ES		 1489static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1490 struct ieee80211_hdr *hdr)
1491{
1492 u8 tid = IWL_MAX_TID_COUNT;
1493
1494 if (ieee80211_is_data_qos(hdr->frame_control)) {
1495 u8 *qc = ieee80211_get_qos_ctl(hdr);
1496 tid = qc[0] & 0xf;
1497 }
1498
1499 if (unlikely(tid > IWL_MAX_TID_COUNT))
1500 tid = IWL_MAX_TID_COUNT;
1501
1502 return tid;
1503}
1504
b3b06a32
ES		 1505static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1506 struct iwl_lq_sta *lq_sta,
1507 struct ieee80211_sta *sta,
1508 struct iwl_scale_tbl_info *tbl)
1509{
198266a3 1510 int i, j, max_rate;
b3b06a32
ES		 1511 enum rs_column next_col_id;
1512 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1513 const struct rs_tx_column *next_col;
1514 allow_column_func_t allow_func;
4ed735e7 1515 u8 valid_ants = mvm->fw->valid_tx_ant;
a34529e8 1516 const u16 *expected_tpt_tbl;
198266a3 1517 u16 tpt, max_expected_tpt;
b3b06a32
ES		 1518
1519 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1520 next_col_id = curr_col->next_columns[i];
1521
1522 if (next_col_id == RS_COLUMN_INVALID)
1523 continue;
1524
1525 if (lq_sta->visited_columns & BIT(next_col_id)) {
1526 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1527 next_col_id);
1528 continue;
1529 }
1530
1531 next_col = &rs_tx_columns[next_col_id];
1532
1533 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1534 IWL_DEBUG_RATE(mvm,
1535 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1536 next_col_id, valid_ants, next_col->ant);
1537 continue;
1538 }
1539
1540 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1541 allow_func = next_col->checks[j];
1542 if (allow_func && !allow_func(mvm, sta, tbl))
1543 break;
1544 }
1545
1546 if (j != MAX_COLUMN_CHECKS) {
1547 IWL_DEBUG_RATE(mvm,
1548 "Skip column %d: not allowed (check %d failed)\n",
1549 next_col_id, j);
1550
1551 continue;
1552 }
1553
1554 tpt = lq_sta->last_tpt / 100;
1555 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
049e0c33 1556 rs_bw_from_sta_bw(sta));
b3b06a32
ES		 1557 if (WARN_ON_ONCE(!expected_tpt_tbl))
1558 continue;
1559
198266a3
ES		 1560 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1561 if (WARN_ON_ONCE(max_rate == IWL_RATE_INVALID))
1562 continue;
b3b06a32 1563
198266a3 1564 max_expected_tpt = expected_tpt_tbl[max_rate];
b3b06a32
ES		 1565 if (tpt >= max_expected_tpt) {
1566 IWL_DEBUG_RATE(mvm,
1567 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1568 next_col_id, max_expected_tpt, tpt);
1569 continue;
1570 }
1571
198266a3
ES		 1572 IWL_DEBUG_RATE(mvm,
1573 "Found potential column %d. Max expected %d current %d\n",
1574 next_col_id, max_expected_tpt, tpt);
b3b06a32
ES		 1575 break;
1576 }
1577
1578 if (i == MAX_NEXT_COLUMNS)
1579 return RS_COLUMN_INVALID;
1580
b3b06a32
ES		 1581 return next_col_id;
1582}
1583
1584static int rs_switch_to_column(struct iwl_mvm *mvm,
1585 struct iwl_lq_sta *lq_sta,
1586 struct ieee80211_sta *sta,
1587 enum rs_column col_id)
1588{
1589 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1590 struct iwl_scale_tbl_info *search_tbl =
1591 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1592 struct rs_rate *rate = &search_tbl->rate;
1593 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1594 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1595 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1596 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
80763515 1597 unsigned long rate_mask = 0;
b3b06a32
ES		 1598 u32 rate_idx = 0;
1599
1600 memcpy(search_tbl, tbl, sz);
1601
1602 rate->sgi = column->sgi;
1603 rate->ant = column->ant;
1604
1605 if (column->mode == RS_LEGACY) {
1606 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1607 rate->type = LQ_LEGACY_A;
1608 else
1609 rate->type = LQ_LEGACY_G;
1610
1611 rate_mask = lq_sta->active_legacy_rate;
1612 } else if (column->mode == RS_SISO) {
1613 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1614 rate_mask = lq_sta->active_siso_rate;
1615 } else if (column->mode == RS_MIMO2) {
1616 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1617 rate_mask = lq_sta->active_mimo2_rate;
1618 } else {
1619 WARN_ON_ONCE("Bad column mode");
1620 }
1621
1622 rate->bw = rs_bw_from_sta_bw(sta);
1623 search_tbl->column = col_id;
1624 rs_set_expected_tpt_table(lq_sta, search_tbl);
1625
75d3e2d6
ES		 1626 lq_sta->visited_columns |= BIT(col_id);
1627
b3b06a32
ES		 1628 /* Get the best matching rate if we're changing modes. e.g.
1629 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1630 */
1631 if (curr_column->mode != column->mode) {
1632 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1633 rate_mask, rate->index);
1634
1635 if ((rate_idx == IWL_RATE_INVALID) ||
1636 !(BIT(rate_idx) & rate_mask)) {
1637 IWL_DEBUG_RATE(mvm,
1638 "can not switch with index %d"
80763515 1639 " rate mask %lx\n",
b3b06a32
ES		 1640 rate_idx, rate_mask);
1641
1642 goto err;
1643 }
1644
1645 rate->index = rate_idx;
1646 }
1647
b3b06a32
ES		 1648 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1649 col_id, rate->index);
1650
b3b06a32
ES		 1651 return 0;
1652
1653err:
1654 rate->type = LQ_NONE;
1655 return -1;
1656}
1657
4e4b815c
ES		 1658static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1659 struct iwl_scale_tbl_info *tbl,
1660 s32 sr, int low, int high,
1661 int current_tpt,
1662 int low_tpt, int high_tpt)
1663{
1664 enum rs_action action = RS_ACTION_STAY;
1665
4e4b815c
ES		 1666 if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1667 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1668 "Decrease rate because of low SR\n");
1669 return RS_ACTION_DOWNSCALE;
4e4b815c
ES		 1670 }
1671
e53839eb
ES		 1672 if ((low_tpt == IWL_INVALID_VALUE) &&
1673 (high_tpt == IWL_INVALID_VALUE) &&
1674 (high != IWL_RATE_INVALID)) {
4e4b815c 1675 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1676 "No data about high/low rates. Increase rate\n");
1677 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1678 }
1679
e53839eb
ES		 1680 if ((high_tpt == IWL_INVALID_VALUE) &&
1681 (high != IWL_RATE_INVALID) &&
1682 (low_tpt != IWL_INVALID_VALUE) &&
1683 (low_tpt < current_tpt)) {
1684 IWL_DEBUG_RATE(mvm,
1685 "No data about high rate and low rate is worse. Increase rate\n");
1686 return RS_ACTION_UPSCALE;
1687 }
4e4b815c 1688
e53839eb
ES		 1689 if ((high_tpt != IWL_INVALID_VALUE) &&
1690 (high_tpt > current_tpt)) {
1691 IWL_DEBUG_RATE(mvm,
1692 "Higher rate is better. Increate rate\n");
1693 return RS_ACTION_UPSCALE;
4e4b815c
ES		 1694 }
1695
e53839eb
ES		 1696 if ((low_tpt != IWL_INVALID_VALUE) &&
1697 (high_tpt != IWL_INVALID_VALUE) &&
1698 (low_tpt < current_tpt) &&
1699 (high_tpt < current_tpt)) {
4e4b815c 1700 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1701 "Both high and low are worse. Maintain rate\n");
1702 return RS_ACTION_STAY;
1703 }
1704
1705 if ((low_tpt != IWL_INVALID_VALUE) &&
1706 (low_tpt > current_tpt)) {
1707 IWL_DEBUG_RATE(mvm,
1708 "Lower rate is better\n");
1709 action = RS_ACTION_DOWNSCALE;
1710 goto out;
1711 }
1712
1713 if ((low_tpt == IWL_INVALID_VALUE) &&
1714 (low != IWL_RATE_INVALID)) {
4e4b815c 1715 IWL_DEBUG_RATE(mvm,
e53839eb
ES		 1716 "No data about lower rate\n");
1717 action = RS_ACTION_DOWNSCALE;
1718 goto out;
1719 }
1720
1721 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1722
1723out:
1724 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1725 if (sr >= RS_SR_NO_DECREASE) {
1726 IWL_DEBUG_RATE(mvm,
1727 "SR is above NO DECREASE. Avoid downscale\n");
1728 action = RS_ACTION_STAY;
1729 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1730 IWL_DEBUG_RATE(mvm,
1731 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1732 action = RS_ACTION_STAY;
1733 } else {
1734 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1735 }
4e4b815c
ES		 1736 }
1737
1738 return action;
1739}
b3b06a32 1740
2fd647f8
EP		 1741static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1742 int *weaker, int *stronger)
1743{
1744 *weaker = index + TPC_TX_POWER_STEP;
1745 if (*weaker > TPC_MAX_REDUCTION)
1746 *weaker = TPC_INVALID;
1747
1748 *stronger = index - TPC_TX_POWER_STEP;
1749 if (*stronger < 0)
1750 *stronger = TPC_INVALID;
1751}
1752
1e9551de
ES		 1753static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1754 struct rs_rate *rate, enum ieee80211_band band)
2fd647f8
EP		 1755{
1756 int index = rate->index;
1e9551de
ES		 1757 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1758 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1759 !vif->bss_conf.ps);
2fd647f8 1760
1e9551de
ES		 1761 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1762 cam, sta_ps_disabled);
2fd647f8
EP		 1763 /*
1764 * allow tpc only if power management is enabled, or bt coex
1765 * activity grade allows it and we are on 2.4Ghz.
1766 */
1e9551de 1767 if ((cam || sta_ps_disabled) &&
2fd647f8
EP		 1768 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1769 return false;
1770
1771 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1772 if (is_legacy(rate))
1773 return index == IWL_RATE_54M_INDEX;
1774 if (is_ht(rate))
1775 return index == IWL_RATE_MCS_7_INDEX;
1776 if (is_vht(rate))
1777 return index == IWL_RATE_MCS_7_INDEX ||
1778 index == IWL_RATE_MCS_8_INDEX ||
1779 index == IWL_RATE_MCS_9_INDEX;
1780
1781 WARN_ON_ONCE(1);
1782 return false;
1783}
1784
1785enum tpc_action {
1786 TPC_ACTION_STAY,
1787 TPC_ACTION_DECREASE,
1788 TPC_ACTION_INCREASE,
1789 TPC_ACTION_NO_RESTIRCTION,
1790};
1791
1792static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1793 s32 sr, int weak, int strong,
1794 int current_tpt,
1795 int weak_tpt, int strong_tpt)
1796{
1797 /* stay until we have valid tpt */
1798 if (current_tpt == IWL_INVALID_VALUE) {
1799 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1800 return TPC_ACTION_STAY;
1801 }
1802
1803 /* Too many failures, increase txp */
1804 if (sr <= TPC_SR_FORCE_INCREASE || current_tpt == 0) {
1805 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1806 return TPC_ACTION_NO_RESTIRCTION;
1807 }
1808
1809 /* try decreasing first if applicable */
1810 if (weak != TPC_INVALID) {
1811 if (weak_tpt == IWL_INVALID_VALUE &&
1812 (strong_tpt == IWL_INVALID_VALUE ||
1813 current_tpt >= strong_tpt)) {
1814 IWL_DEBUG_RATE(mvm,
1815 "no weak txp measurement. decrease txp\n");
1816 return TPC_ACTION_DECREASE;
1817 }
1818
1819 if (weak_tpt > current_tpt) {
1820 IWL_DEBUG_RATE(mvm,
1821 "lower txp has better tpt. decrease txp\n");
1822 return TPC_ACTION_DECREASE;
1823 }
1824 }
1825
1826 /* next, increase if needed */
1827 if (sr < TPC_SR_NO_INCREASE && strong != TPC_INVALID) {
1828 if (weak_tpt == IWL_INVALID_VALUE &&
1829 strong_tpt != IWL_INVALID_VALUE &&
1830 current_tpt < strong_tpt) {
1831 IWL_DEBUG_RATE(mvm,
1832 "higher txp has better tpt. increase txp\n");
1833 return TPC_ACTION_INCREASE;
1834 }
1835
1836 if (weak_tpt < current_tpt &&
1837 (strong_tpt == IWL_INVALID_VALUE ||
1838 strong_tpt > current_tpt)) {
1839 IWL_DEBUG_RATE(mvm,
1840 "lower txp has worse tpt. increase txp\n");
1841 return TPC_ACTION_INCREASE;
1842 }
1843 }
1844
1845 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1846 return TPC_ACTION_STAY;
1847}
1848
1849static bool rs_tpc_perform(struct iwl_mvm *mvm,
1850 struct ieee80211_sta *sta,
1851 struct iwl_lq_sta *lq_sta,
1852 struct iwl_scale_tbl_info *tbl)
1853{
1854 struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
1855 struct ieee80211_vif *vif = mvm_sta->vif;
1856 struct ieee80211_chanctx_conf *chanctx_conf;
1857 enum ieee80211_band band;
1858 struct iwl_rate_scale_data *window;
1859 struct rs_rate *rate = &tbl->rate;
1860 enum tpc_action action;
1861 s32 sr;
1862 u8 cur = lq_sta->lq.reduced_tpc;
1863 int current_tpt;
1864 int weak, strong;
1865 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1866
9a75b3df 1867#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 1868 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
3c6acb61 1869 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
ae969afe
EP		 1870 lq_sta->pers.dbg_fixed_txp_reduction);
1871 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1872 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
9a75b3df
EP		 1873 }
1874#endif
1875
2fd647f8
EP		 1876 rcu_read_lock();
1877 chanctx_conf = rcu_dereference(vif->chanctx_conf);
1878 if (WARN_ON(!chanctx_conf))
1879 band = IEEE80211_NUM_BANDS;
1880 else
1881 band = chanctx_conf->def.chan->band;
1882 rcu_read_unlock();
1883
1e9551de 1884 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2fd647f8 1885 IWL_DEBUG_RATE(mvm,
3c6acb61 1886 "tpc is not allowed. remove txp restrictions\n");
2fd647f8
EP		 1887 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1888 return cur != TPC_NO_REDUCTION;
1889 }
1890
1891 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1892
1893 /* Collect measured throughputs for current and adjacent rates */
1894 window = tbl->tpc_win;
1895 sr = window[cur].success_ratio;
1896 current_tpt = window[cur].average_tpt;
1897 if (weak != TPC_INVALID)
1898 weak_tpt = window[weak].average_tpt;
1899 if (strong != TPC_INVALID)
1900 strong_tpt = window[strong].average_tpt;
1901
1902 IWL_DEBUG_RATE(mvm,
1903 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1904 cur, current_tpt, sr, weak, strong,
1905 weak_tpt, strong_tpt);
1906
1907 action = rs_get_tpc_action(mvm, sr, weak, strong,
1908 current_tpt, weak_tpt, strong_tpt);
1909
1910 /* override actions if we are on the edge */
1911 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
3c6acb61 1912 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2fd647f8
EP		 1913 action = TPC_ACTION_STAY;
1914 } else if (strong == TPC_INVALID &&
1915 (action == TPC_ACTION_INCREASE ||
1916 action == TPC_ACTION_NO_RESTIRCTION)) {
3c6acb61 1917 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2fd647f8
EP		 1918 action = TPC_ACTION_STAY;
1919 }
1920
1921 switch (action) {
1922 case TPC_ACTION_DECREASE:
1923 lq_sta->lq.reduced_tpc = weak;
1924 return true;
1925 case TPC_ACTION_INCREASE:
1926 lq_sta->lq.reduced_tpc = strong;
1927 return true;
1928 case TPC_ACTION_NO_RESTIRCTION:
1929 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1930 return true;
1931 case TPC_ACTION_STAY:
1932 /* do nothing */
1933 break;
1934 }
1935 return false;
1936}
1937
8ca151b5
JB		 1938/*
1939 * Do rate scaling and search for new modulation mode.
1940 */
1941static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1942 struct sk_buff *skb,
1943 struct ieee80211_sta *sta,
1944 struct iwl_lq_sta *lq_sta)
1945{
1946 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1947 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1948 int low = IWL_RATE_INVALID;
1949 int high = IWL_RATE_INVALID;
1950 int index;
8ca151b5
JB		 1951 struct iwl_rate_scale_data *window = NULL;
1952 int current_tpt = IWL_INVALID_VALUE;
1953 int low_tpt = IWL_INVALID_VALUE;
1954 int high_tpt = IWL_INVALID_VALUE;
1955 u32 fail_count;
4e4b815c 1956 enum rs_action scale_action = RS_ACTION_STAY;
8ca151b5
JB		 1957 u16 rate_mask;
1958 u8 update_lq = 0;
1959 struct iwl_scale_tbl_info *tbl, *tbl1;
8ca151b5
JB		 1960 u8 active_tbl = 0;
1961 u8 done_search = 0;
1962 u16 high_low;
1963 s32 sr;
1964 u8 tid = IWL_MAX_TID_COUNT;
9d015a03 1965 u8 prev_agg = lq_sta->is_agg;
8ca151b5
JB		 1966 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1967 struct iwl_mvm_tid_data *tid_data;
5aa33553 1968 struct rs_rate *rate;
8ca151b5 1969
8ca151b5
JB		 1970 /* Send management frames and NO_ACK data using lowest rate. */
1971 /* TODO: this could probably be improved.. */
1972 if (!ieee80211_is_data(hdr->frame_control) ||
1973 info->flags & IEEE80211_TX_CTL_NO_ACK)
1974 return;
1975
977342bc 1976 tid = rs_get_tid(lq_sta, hdr);
8ca151b5
JB		 1977 if ((tid != IWL_MAX_TID_COUNT) &&
1978 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1979 tid_data = &sta_priv->tid_data[tid];
1980 if (tid_data->state == IWL_AGG_OFF)
1981 lq_sta->is_agg = 0;
1982 else
1983 lq_sta->is_agg = 1;
1984 } else {
1985 lq_sta->is_agg = 0;
1986 }
1987
1988 /*
1989 * Select rate-scale / modulation-mode table to work with in
1990 * the rest of this function: "search" if searching for better
1991 * modulation mode, or "active" if doing rate scaling within a mode.
1992 */
1993 if (!lq_sta->search_better_tbl)
1994 active_tbl = lq_sta->active_tbl;
1995 else
1996 active_tbl = 1 - lq_sta->active_tbl;
1997
1998 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 1999 rate = &tbl->rate;
8ca151b5 2000
9d015a03
ES		 2001 if (prev_agg != lq_sta->is_agg) {
2002 IWL_DEBUG_RATE(mvm,
2003 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2004 prev_agg, lq_sta->is_agg);
2005 rs_set_expected_tpt_table(lq_sta, tbl);
b804eeb6 2006 rs_rate_scale_clear_tbl_windows(mvm, tbl);
9d015a03
ES		 2007 }
2008
8ca151b5
JB		 2009 /* current tx rate */
2010 index = lq_sta->last_txrate_idx;
2011
8ca151b5 2012 /* rates available for this association, and for modulation mode */
a8ff14f5 2013 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5 2014
ca6f38ff 2015 if (!(BIT(index) & rate_mask)) {
8ca151b5
JB		 2016 IWL_ERR(mvm, "Current Rate is not valid\n");
2017 if (lq_sta->search_better_tbl) {
2018 /* revert to active table if search table is not valid*/
5aa33553 2019 rate->type = LQ_NONE;
8ca151b5
JB		 2020 lq_sta->search_better_tbl = 0;
2021 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 2022 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
8ca151b5
JB		 2023 }
2024 return;
2025 }
2026
2027 /* Get expected throughput table and history window for current rate */
2028 if (!tbl->expected_tpt) {
2029 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2030 return;
2031 }
2032
2033 /* force user max rate if set by user */
2034 if ((lq_sta->max_rate_idx != -1) &&
2035 (lq_sta->max_rate_idx < index)) {
2036 index = lq_sta->max_rate_idx;
2037 update_lq = 1;
2038 window = &(tbl->win[index]);
4d30ee82
ES		 2039 IWL_DEBUG_RATE(mvm,
2040 "Forcing user max rate %d\n",
2041 index);
8ca151b5
JB		 2042 goto lq_update;
2043 }
2044
2045 window = &(tbl->win[index]);
2046
2047 /*
2048 * If there is not enough history to calculate actual average
2049 * throughput, keep analyzing results of more tx frames, without
2050 * changing rate or mode (bypass most of the rest of this function).
2051 * Set up new rate table in uCode only if old rate is not supported
2052 * in current association (use new rate found above).
2053 */
2054 fail_count = window->counter - window->success_counter;
2055 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2056 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2057 IWL_DEBUG_RATE(mvm,
4d30ee82 2058 "(%s: %d): Test Window: succ %d total %d\n",
5aa33553 2059 rs_pretty_lq_type(rate->type),
4d30ee82 2060 index, window->success_counter, window->counter);
8ca151b5
JB		 2061
2062 /* Can't calculate this yet; not enough history */
2063 window->average_tpt = IWL_INVALID_VALUE;
2064
2065 /* Should we stay with this modulation mode,
2066 * or search for a new one? */
2067 rs_stay_in_table(lq_sta, false);
2068
2069 goto out;
2070 }
2071 /* Else we have enough samples; calculate estimate of
2072 * actual average throughput */
2073 if (window->average_tpt != ((window->success_ratio *
2074 tbl->expected_tpt[index] + 64) / 128)) {
8ca151b5
JB		 2075 window->average_tpt = ((window->success_ratio *
2076 tbl->expected_tpt[index] + 64) / 128);
2077 }
2078
2079 /* If we are searching for better modulation mode, check success. */
2080 if (lq_sta->search_better_tbl) {
2081 /* If good success, continue using the "search" mode;
2082 * no need to send new link quality command, since we're
2083 * continuing to use the setup that we've been trying. */
2084 if (window->average_tpt > lq_sta->last_tpt) {
2085 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2086 "SWITCHING TO NEW TABLE SR: %d "
2087 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2088 window->success_ratio,
2089 window->average_tpt,
2090 lq_sta->last_tpt);
2091
8ca151b5
JB		 2092 /* Swap tables; "search" becomes "active" */
2093 lq_sta->active_tbl = active_tbl;
2094 current_tpt = window->average_tpt;
2095 /* Else poor success; go back to mode in "active" table */
2096 } else {
2097 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2098 "GOING BACK TO THE OLD TABLE: SR %d "
2099 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 2100 window->success_ratio,
2101 window->average_tpt,
2102 lq_sta->last_tpt);
2103
2104 /* Nullify "search" table */
5aa33553 2105 rate->type = LQ_NONE;
8ca151b5
JB		 2106
2107 /* Revert to "active" table */
2108 active_tbl = lq_sta->active_tbl;
2109 tbl = &(lq_sta->lq_info[active_tbl]);
2110
2111 /* Revert to "active" rate and throughput info */
8fc7c58c 2112 index = tbl->rate.index;
8ca151b5
JB		 2113 current_tpt = lq_sta->last_tpt;
2114
2115 /* Need to set up a new rate table in uCode */
2116 update_lq = 1;
2117 }
2118
2119 /* Either way, we've made a decision; modulation mode
2120 * search is done, allow rate adjustment next time. */
2121 lq_sta->search_better_tbl = 0;
2122 done_search = 1; /* Don't switch modes below! */
2123 goto lq_update;
2124 }
2125
2126 /* (Else) not in search of better modulation mode, try for better
2127 * starting rate, while staying in this mode. */
ca6f38ff 2128 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
8ca151b5
JB		 2129 low = high_low & 0xff;
2130 high = (high_low >> 8) & 0xff;
2131
2132 /* If user set max rate, dont allow higher than user constrain */
2133 if ((lq_sta->max_rate_idx != -1) &&
2134 (lq_sta->max_rate_idx < high))
2135 high = IWL_RATE_INVALID;
2136
2137 sr = window->success_ratio;
2138
2139 /* Collect measured throughputs for current and adjacent rates */
2140 current_tpt = window->average_tpt;
2141 if (low != IWL_RATE_INVALID)
2142 low_tpt = tbl->win[low].average_tpt;
2143 if (high != IWL_RATE_INVALID)
2144 high_tpt = tbl->win[high].average_tpt;
2145
4d30ee82
ES		 2146 IWL_DEBUG_RATE(mvm,
2147 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
5aa33553
ES		 2148 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2149 low, high, low_tpt, high_tpt);
4d30ee82 2150
4e4b815c
ES		 2151 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2152 current_tpt, low_tpt, high_tpt);
8ca151b5 2153
393b9e5b 2154 /* Force a search in case BT doesn't like us being in MIMO */
5aa33553 2155 if (is_mimo(rate) &&
393b9e5b 2156 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
4d30ee82
ES		 2157 IWL_DEBUG_RATE(mvm,
2158 "BT Coex forbids MIMO. Search for new config\n");
36946ce6
EG		 2159 rs_stay_in_table(lq_sta, true);
2160 goto lq_update;
2161 }
2162
8ca151b5 2163 switch (scale_action) {
4e4b815c 2164 case RS_ACTION_DOWNSCALE:
8ca151b5
JB		 2165 /* Decrease starting rate, update uCode's rate table */
2166 if (low != IWL_RATE_INVALID) {
2167 update_lq = 1;
2168 index = low;
4d30ee82
ES		 2169 } else {
2170 IWL_DEBUG_RATE(mvm,
2171 "At the bottom rate. Can't decrease\n");
8ca151b5
JB		 2172 }
2173
2174 break;
4e4b815c 2175 case RS_ACTION_UPSCALE:
8ca151b5
JB		 2176 /* Increase starting rate, update uCode's rate table */
2177 if (high != IWL_RATE_INVALID) {
2178 update_lq = 1;
2179 index = high;
4d30ee82
ES		 2180 } else {
2181 IWL_DEBUG_RATE(mvm,
2182 "At the top rate. Can't increase\n");
8ca151b5
JB		 2183 }
2184
2185 break;
4e4b815c 2186 case RS_ACTION_STAY:
8ca151b5 2187 /* No change */
e6c8d602
ES		 2188 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2189 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2fd647f8 2190 break;
8ca151b5
JB		 2191 default:
2192 break;
2193 }
2194
8ca151b5
JB		 2195lq_update:
2196 /* Replace uCode's rate table for the destination station. */
5aa33553
ES		 2197 if (update_lq) {
2198 tbl->rate.index = index;
2199 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2200 }
8ca151b5
JB		 2201
2202 rs_stay_in_table(lq_sta, false);
2203
2204 /*
2205 * Search for new modulation mode if we're:
2206 * 1) Not changing rates right now
2207 * 2) Not just finishing up a search
2208 * 3) Allowing a new search
2209 */
2210 if (!update_lq && !done_search &&
b3b06a32
ES		 2211 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2212 && window->counter) {
2213 enum rs_column next_column;
2214
8ca151b5
JB		 2215 /* Save current throughput to compare with "search" throughput*/
2216 lq_sta->last_tpt = current_tpt;
2217
4d30ee82 2218 IWL_DEBUG_RATE(mvm,
b3b06a32
ES		 2219 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2220 update_lq, done_search, lq_sta->rs_state,
4d30ee82 2221 window->counter);
b3b06a32
ES		 2222
2223 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2224 if (next_column != RS_COLUMN_INVALID) {
2225 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2226 next_column);
2227 if (!ret)
2228 lq_sta->search_better_tbl = 1;
2229 } else {
2230 IWL_DEBUG_RATE(mvm,
2231 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2232 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2233 }
8ca151b5
JB		 2234
2235 /* If new "search" mode was selected, set up in uCode table */
2236 if (lq_sta->search_better_tbl) {
2237 /* Access the "search" table, clear its history. */
2238 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
b804eeb6 2239 rs_rate_scale_clear_tbl_windows(mvm, tbl);
8ca151b5
JB		 2240
2241 /* Use new "search" start rate */
8fc7c58c 2242 index = tbl->rate.index;
8ca151b5 2243
b3b06a32
ES		 2244 rs_dump_rate(mvm, &tbl->rate,
2245 "Switch to SEARCH TABLE:");
8fc7c58c 2246 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
9e680946 2247 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 2248 } else {
2249 done_search = 1;
2250 }
2251 }
2252
b3b06a32 2253 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
8ca151b5
JB		 2254 /* If the "active" (non-search) mode was legacy,
2255 * and we've tried switching antennas,
2256 * but we haven't been able to try HT modes (not available),
2257 * stay with best antenna legacy modulation for a while
2258 * before next round of mode comparisons. */
2259 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
fd7dbee5 2260 if (is_legacy(&tbl1->rate)) {
8ca151b5 2261 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
fd7dbee5
ES		 2262
2263 if (tid != IWL_MAX_TID_COUNT) {
2264 tid_data = &sta_priv->tid_data[tid];
2265 if (tid_data->state != IWL_AGG_OFF) {
2266 IWL_DEBUG_RATE(mvm,
2267 "Stop aggregation on tid %d\n",
2268 tid);
2269 ieee80211_stop_tx_ba_session(sta, tid);
2270 }
2271 }
8ca151b5 2272 rs_set_stay_in_table(mvm, 1, lq_sta);
b3b06a32 2273 } else {
8ca151b5
JB		 2274 /* If we're in an HT mode, and all 3 mode switch actions
2275 * have been tried and compared, stay in this best modulation
2276 * mode for a while before next round of mode comparisons. */
8ca151b5
JB		 2277 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2278 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2279 (tid != IWL_MAX_TID_COUNT)) {
2280 tid_data = &sta_priv->tid_data[tid];
2281 if (tid_data->state == IWL_AGG_OFF) {
2282 IWL_DEBUG_RATE(mvm,
2283 "try to aggregate tid %d\n",
2284 tid);
2285 rs_tl_turn_on_agg(mvm, tid,
2286 lq_sta, sta);
2287 }
2288 }
2289 rs_set_stay_in_table(mvm, 0, lq_sta);
2290 }
2291 }
2292
2293out:
8ca151b5
JB		 2294 lq_sta->last_txrate_idx = index;
2295}
2296
2297/**
2298 * rs_initialize_lq - Initialize a station's hardware rate table
2299 *
2300 * The uCode's station table contains a table of fallback rates
2301 * for automatic fallback during transmission.
2302 *
2303 * NOTE: This sets up a default set of values. These will be replaced later
2304 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2305 * rc80211_simple.
2306 *
2307 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2308 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2309 * which requires station table entry to exist).
2310 */
2311static void rs_initialize_lq(struct iwl_mvm *mvm,
2312 struct ieee80211_sta *sta,
2313 struct iwl_lq_sta *lq_sta,
b87c2179
ES		 2314 enum ieee80211_band band,
2315 bool init)
8ca151b5
JB		 2316{
2317 struct iwl_scale_tbl_info *tbl;
5aa33553 2318 struct rs_rate *rate;
8ca151b5 2319 int i;
8ca151b5
JB		 2320 u8 active_tbl = 0;
2321 u8 valid_tx_ant;
2322
2323 if (!sta || !lq_sta)
2324 return;
2325
2326 i = lq_sta->last_txrate_idx;
2327
4ed735e7 2328 valid_tx_ant = mvm->fw->valid_tx_ant;
8ca151b5
JB		 2329
2330 if (!lq_sta->search_better_tbl)
2331 active_tbl = lq_sta->active_tbl;
2332 else
2333 active_tbl = 1 - lq_sta->active_tbl;
2334
2335 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2336 rate = &tbl->rate;
8ca151b5
JB		 2337
2338 if ((i < 0) || (i >= IWL_RATE_COUNT))
2339 i = 0;
2340
b3b06a32 2341 rate->index = i;
5aa33553 2342 rate->ant = first_antenna(valid_tx_ant);
b3b06a32
ES		 2343 rate->sgi = false;
2344 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2345 if (band == IEEE80211_BAND_5GHZ)
2346 rate->type = LQ_LEGACY_A;
2347 else
2348 rate->type = LQ_LEGACY_G;
8ca151b5 2349
b3b06a32
ES		 2350 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2351 if (rate->ant == ANT_A)
2352 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2353 else
2354 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2355
8ca151b5 2356 rs_set_expected_tpt_table(lq_sta, tbl);
80e9e5cd 2357 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
8ca151b5 2358 /* TODO restore station should remember the lq cmd */
b87c2179 2359 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
8ca151b5
JB		 2360}
2361
2362static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2363 struct ieee80211_tx_rate_control *txrc)
2364{
2365 struct sk_buff *skb = txrc->skb;
2366 struct ieee80211_supported_band *sband = txrc->sband;
2367 struct iwl_op_mode *op_mode __maybe_unused =
2368 (struct iwl_op_mode *)mvm_r;
2369 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2370 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2371 struct iwl_lq_sta *lq_sta = mvm_sta;
8ca151b5 2372
8ca151b5
JB		 2373 /* Get max rate if user set max rate */
2374 if (lq_sta) {
2375 lq_sta->max_rate_idx = txrc->max_rate_idx;
2376 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2377 (lq_sta->max_rate_idx != -1))
2378 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2379 if ((lq_sta->max_rate_idx < 0) ||
2380 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2381 lq_sta->max_rate_idx = -1;
2382 }
2383
2384 /* Treat uninitialized rate scaling data same as non-existing. */
ae969afe 2385 if (lq_sta && !lq_sta->pers.drv) {
8ca151b5
JB		 2386 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2387 mvm_sta = NULL;
2388 }
2389
2390 /* Send management frames and NO_ACK data using lowest rate. */
2391 if (rate_control_send_low(sta, mvm_sta, txrc))
2392 return;
2393
d310e405
ES		 2394 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2395 info->band, &info->control.rates[0]);
2396
622ebe99 2397 info->control.rates[0].count = 1;
8ca151b5
JB		 2398}
2399
2400static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2401 gfp_t gfp)
2402{
2403 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
ae969afe
EP		 2404 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2405 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2406 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
8ca151b5
JB		 2407
2408 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2409
ae969afe
EP		 2410 lq_sta->pers.drv = mvm;
2411#ifdef CONFIG_MAC80211_DEBUGFS
2412 lq_sta->pers.dbg_fixed_rate = 0;
2413 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2414#endif
2415
8ca151b5
JB		 2416 return &sta_priv->lq_sta;
2417}
2418
d310e405
ES		 2419static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2420 int nss)
2421{
2422 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2423 (0x3 << (2 * (nss - 1)));
2424 rx_mcs >>= (2 * (nss - 1));
2425
2426 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2427 return IWL_RATE_MCS_7_INDEX;
2428 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2429 return IWL_RATE_MCS_8_INDEX;
2430 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2431 return IWL_RATE_MCS_9_INDEX;
2432
2433 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2434 return -1;
2435}
2436
750a1b45
ES		 2437static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2438 struct ieee80211_sta_vht_cap *vht_cap,
2439 struct iwl_lq_sta *lq_sta)
2440{
2441 int i;
2442 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2443
2444 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2445 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2446 if (i == IWL_RATE_9M_INDEX)
2447 continue;
2448
271518ad
ES		 2449 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2450 if (i == IWL_RATE_MCS_9_INDEX &&
2451 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2452 continue;
2453
750a1b45
ES		 2454 lq_sta->active_siso_rate |= BIT(i);
2455 }
2456 }
2457
ecc90e79
ES		 2458 if (sta->rx_nss < 2)
2459 return;
2460
750a1b45
ES		 2461 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2462 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2463 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2464 if (i == IWL_RATE_9M_INDEX)
2465 continue;
2466
271518ad
ES		 2467 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2468 if (i == IWL_RATE_MCS_9_INDEX &&
2469 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2470 continue;
2471
750a1b45
ES		 2472 lq_sta->active_mimo2_rate |= BIT(i);
2473 }
2474 }
2475}
2476
5fc0f76c
ES		 2477#ifdef CONFIG_IWLWIFI_DEBUGFS
2478static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2479 struct iwl_mvm_frame_stats *stats)
2480{
2481 spin_lock_bh(&mvm->drv_stats_lock);
2482 memset(stats, 0, sizeof(*stats));
2483 spin_unlock_bh(&mvm->drv_stats_lock);
2484}
2485
2486void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2487 struct iwl_mvm_frame_stats *stats,
2488 u32 rate, bool agg)
2489{
2490 u8 nss = 0, mcs = 0;
2491
2492 spin_lock(&mvm->drv_stats_lock);
2493
2494 if (agg)
2495 stats->agg_frames++;
2496
2497 stats->success_frames++;
2498
2499 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2500 case RATE_MCS_CHAN_WIDTH_20:
2501 stats->bw_20_frames++;
2502 break;
2503 case RATE_MCS_CHAN_WIDTH_40:
2504 stats->bw_40_frames++;
2505 break;
2506 case RATE_MCS_CHAN_WIDTH_80:
2507 stats->bw_80_frames++;
2508 break;
2509 default:
2510 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2511 }
2512
2513 if (rate & RATE_MCS_HT_MSK) {
2514 stats->ht_frames++;
2515 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2516 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2517 } else if (rate & RATE_MCS_VHT_MSK) {
2518 stats->vht_frames++;
2519 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2520 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2521 RATE_VHT_MCS_NSS_POS) + 1;
2522 } else {
2523 stats->legacy_frames++;
2524 }
2525
2526 if (nss == 1)
2527 stats->siso_frames++;
2528 else if (nss == 2)
2529 stats->mimo2_frames++;
2530
2531 if (rate & RATE_MCS_SGI_MSK)
2532 stats->sgi_frames++;
2533 else
2534 stats->ngi_frames++;
2535
2536 stats->last_rates[stats->last_frame_idx] = rate;
2537 stats->last_frame_idx = (stats->last_frame_idx + 1) %
2538 ARRAY_SIZE(stats->last_rates);
2539
2540 spin_unlock(&mvm->drv_stats_lock);
2541}
2542#endif
2543
8ca151b5
JB		 2544/*
2545 * Called after adding a new station to initialize rate scaling
2546 */
2547void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
b87c2179 2548 enum ieee80211_band band, bool init)
8ca151b5
JB		 2549{
2550 int i, j;
2551 struct ieee80211_hw *hw = mvm->hw;
2552 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
d310e405 2553 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
8ca151b5
JB		 2554 struct iwl_mvm_sta *sta_priv;
2555 struct iwl_lq_sta *lq_sta;
2556 struct ieee80211_supported_band *sband;
2557 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2558
2559 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2560 lq_sta = &sta_priv->lq_sta;
ae969afe
EP		 2561
2562 /* clear all non-persistent lq data */
2563 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
b87c2179 2564
8ca151b5
JB		 2565 sband = hw->wiphy->bands[band];
2566
2567 lq_sta->lq.sta_id = sta_priv->sta_id;
2568
2569 for (j = 0; j < LQ_SIZE; j++)
b804eeb6 2570 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
8ca151b5
JB		 2571
2572 lq_sta->flush_timer = 0;
87d5e415 2573 lq_sta->last_tx = jiffies;
8ca151b5
JB		 2574
2575 IWL_DEBUG_RATE(mvm,
2576 "LQ: *** rate scale station global init for station %d ***\n",
2577 sta_priv->sta_id);
2578 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2579 * the lowest or the highest rate.. Could consider using RSSI from
2580 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2581 * after assoc.. */
2582
2583 lq_sta->max_rate_idx = -1;
2584 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
8ca151b5
JB		 2585 lq_sta->band = sband->band;
2586 /*
2587 * active legacy rates as per supported rates bitmap
2588 */
2589 supp = sta->supp_rates[sband->band];
2590 lq_sta->active_legacy_rate = 0;
2591 for_each_set_bit(i, &supp, BITS_PER_LONG)
2592 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2593
d310e405
ES		 2594 /* TODO: should probably account for rx_highest for both HT/VHT */
2595 if (!vht_cap || !vht_cap->vht_supported) {
2596 /* active_siso_rate mask includes 9 MBits (bit 5),
2597 * and CCK (bits 0-3), supp_rates[] does not;
2598 * shift to convert format, force 9 MBits off.
2599 */
2600 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2601 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2602 lq_sta->active_siso_rate &= ~((u16)0x2);
2603 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2604
2605 /* Same here */
2606 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2607 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2608 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2609 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2610
2611 lq_sta->is_vht = false;
2612 } else {
750a1b45 2613 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
d310e405
ES		 2614 lq_sta->is_vht = true;
2615 }
8ca151b5 2616
198266a3
ES		 2617 lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate,
2618 BITS_PER_LONG);
2619 lq_sta->max_siso_rate_idx = find_last_bit(&lq_sta->active_siso_rate,
2620 BITS_PER_LONG);
2621 lq_sta->max_mimo2_rate_idx = find_last_bit(&lq_sta->active_mimo2_rate,
2622 BITS_PER_LONG);
2623
2624 IWL_DEBUG_RATE(mvm, "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d\n",
2625 lq_sta->active_legacy_rate,
8ca151b5 2626 lq_sta->active_siso_rate,
d310e405
ES		 2627 lq_sta->active_mimo2_rate,
2628 lq_sta->is_vht);
198266a3
ES		 2629 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2630 lq_sta->max_legacy_rate_idx,
2631 lq_sta->max_siso_rate_idx,
2632 lq_sta->max_mimo2_rate_idx);
8ca151b5
JB		 2633
2634 /* These values will be overridden later */
2635 lq_sta->lq.single_stream_ant_msk =
4ed735e7 2636 first_antenna(mvm->fw->valid_tx_ant);
809bccfa 2637 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
8ca151b5
JB		 2638
2639 /* as default allow aggregation for all tids */
2640 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
8ca151b5
JB		 2641
2642 /* Set last_txrate_idx to lowest rate */
2643 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2644 if (sband->band == IEEE80211_BAND_5GHZ)
2645 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2646 lq_sta->is_agg = 0;
5fc0f76c
ES		 2647#ifdef CONFIG_IWLWIFI_DEBUGFS
2648 iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2649#endif
b87c2179
ES		 2650 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2651}
2652
2653static void rs_rate_update(void *mvm_r,
2654 struct ieee80211_supported_band *sband,
2655 struct cfg80211_chan_def *chandef,
2656 struct ieee80211_sta *sta, void *priv_sta,
2657 u32 changed)
2658{
2659 u8 tid;
2660 struct iwl_op_mode *op_mode =
2661 (struct iwl_op_mode *)mvm_r;
2662 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2663
2664 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2665 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2666 ieee80211_stop_tx_ba_session(sta, tid);
2667
2668 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
8ca151b5
JB		 2669}
2670
8fc7c58c
ES		 2671#ifdef CONFIG_MAC80211_DEBUGFS
2672static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2673 struct iwl_lq_cmd *lq_cmd,
2674 enum ieee80211_band band,
2675 u32 ucode_rate)
2676{
2677 struct rs_rate rate;
2678 int i;
2679 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2680 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2681
2682 for (i = 0; i < num_rates; i++)
2683 lq_cmd->rs_table[i] = ucode_rate_le32;
2684
2685 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2686
2687 if (is_mimo(&rate))
2688 lq_cmd->mimo_delim = num_rates - 1;
2689 else
2690 lq_cmd->mimo_delim = 0;
2691}
2692#endif /* CONFIG_MAC80211_DEBUGFS */
2693
e07be6d3
ES		 2694static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2695 struct iwl_lq_sta *lq_sta,
2696 struct rs_rate *rate,
2697 __le32 *rs_table, int *rs_table_index,
2698 int num_rates, int num_retries,
2699 u8 valid_tx_ant, bool toggle_ant)
2700{
2701 int i, j;
2702 __le32 ucode_rate;
2703 bool bottom_reached = false;
2704 int prev_rate_idx = rate->index;
2705 int end = LINK_QUAL_MAX_RETRY_NUM;
2706 int index = *rs_table_index;
2707
2708 for (i = 0; i < num_rates && index < end; i++) {
2709 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2710 for (j = 0; j < num_retries && index < end; j++, index++)
2711 rs_table[index] = ucode_rate;
2712
2713 if (toggle_ant)
2714 rs_toggle_antenna(valid_tx_ant, rate);
2715
2716 prev_rate_idx = rate->index;
2717 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2718 if (bottom_reached && !is_legacy(rate))
2719 break;
2720 }
2721
2722 if (!bottom_reached)
2723 rate->index = prev_rate_idx;
2724
2725 *rs_table_index = index;
2726}
2727
2728/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2729 * column the rate table should look like this:
2730 *
2731 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2732 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2733 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2734 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2735 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2736 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2737 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2738 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2739 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2740 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2741 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2742 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2743 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2744 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2745 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2746 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2747 */
8fc7c58c
ES		 2748static void rs_build_rates_table(struct iwl_mvm *mvm,
2749 struct iwl_lq_sta *lq_sta,
2750 const struct rs_rate *initial_rate)
8ca151b5 2751{
5aa33553 2752 struct rs_rate rate;
e07be6d3 2753 int num_rates, num_retries, index = 0;
8ca151b5
JB		 2754 u8 valid_tx_ant = 0;
2755 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
e07be6d3 2756 bool toggle_ant = false;
8ca151b5 2757
9e898f1b 2758 memcpy(&rate, initial_rate, sizeof(rate));
8fc7c58c 2759
4ed735e7 2760 valid_tx_ant = mvm->fw->valid_tx_ant;
8ca151b5 2761
e07be6d3
ES		 2762 if (is_siso(&rate)) {
2763 num_rates = RS_INITIAL_SISO_NUM_RATES;
2764 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2765 } else if (is_mimo(&rate)) {
2766 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2767 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
8ca151b5 2768 } else {
e07be6d3
ES		 2769 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2770 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2771 toggle_ant = true;
8ca151b5
JB		 2772 }
2773
e07be6d3
ES		 2774 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2775 num_rates, num_retries, valid_tx_ant,
2776 toggle_ant);
8ca151b5 2777
e07be6d3 2778 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 2779
e07be6d3
ES		 2780 if (is_siso(&rate)) {
2781 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2782 num_retries = RS_SECONDARY_SISO_RETRIES;
d9088f60 2783 lq_cmd->mimo_delim = index;
e07be6d3
ES		 2784 } else if (is_legacy(&rate)) {
2785 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2786 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2787 } else {
2788 WARN_ON_ONCE(1);
2789 }
8ca151b5 2790
e07be6d3 2791 toggle_ant = true;
8ca151b5 2792
e07be6d3
ES		 2793 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2794 num_rates, num_retries, valid_tx_ant,
2795 toggle_ant);
8ca151b5 2796
e07be6d3 2797 rs_get_lower_rate_down_column(lq_sta, &rate);
8ca151b5 2798
e07be6d3
ES		 2799 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2800 num_retries = RS_LEGACY_RETRIES_PER_RATE;
8ca151b5 2801
e07be6d3
ES		 2802 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2803 num_rates, num_retries, valid_tx_ant,
2804 toggle_ant);
8ca151b5 2805
8fc7c58c
ES		 2806}
2807
2808static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2809 struct ieee80211_sta *sta,
2810 struct iwl_lq_sta *lq_sta,
2811 const struct rs_rate *initial_rate)
2812{
2813 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2814 u8 ant = initial_rate->ant;
2815
2816#ifdef CONFIG_MAC80211_DEBUGFS
ae969afe 2817 if (lq_sta->pers.dbg_fixed_rate) {
8fc7c58c
ES		 2818 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2819 lq_sta->band,
ae969afe 2820 lq_sta->pers.dbg_fixed_rate);
2fd647f8 2821 lq_cmd->reduced_tpc = 0;
ae969afe 2822 ant = (lq_sta->pers.dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
8fc7c58c
ES		 2823 RATE_MCS_ANT_POS;
2824 } else
2825#endif
2826 rs_build_rates_table(mvm, lq_sta, initial_rate);
2827
2828 if (num_of_ant(ant) == 1)
2829 lq_cmd->single_stream_ant_msk = ant;
8ca151b5
JB		 2830
2831 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2832 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2833
2834 lq_cmd->agg_time_limit =
2835 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
e96d551f 2836
9145d151
EG		 2837 if (sta)
2838 lq_cmd->agg_time_limit =
5b7ff615 2839 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
8ca151b5
JB		 2840}
2841
2842static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2843{
2844 return hw->priv;
2845}
2846/* rate scale requires free function to be implemented */
2847static void rs_free(void *mvm_rate)
2848{
2849 return;
2850}
2851
2852static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2853 void *mvm_sta)
2854{
2855 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2856 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2857
2858 IWL_DEBUG_RATE(mvm, "enter\n");
2859 IWL_DEBUG_RATE(mvm, "leave\n");
2860}
2861
2862#ifdef CONFIG_MAC80211_DEBUGFS
5fc0f76c 2863int rs_pretty_print_rate(char *buf, const u32 rate)
5aa33553
ES		 2864{
2865
1a61b347
ES		 2866 char *type, *bw;
2867 u8 mcs = 0, nss = 0;
2868 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2869
2870 if (!(rate & RATE_MCS_HT_MSK) &&
2871 !(rate & RATE_MCS_VHT_MSK)) {
2872 int index = iwl_hwrate_to_plcp_idx(rate);
2873
2874 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
560843f4
ES		 2875 rs_pretty_ant(ant),
2876 index == IWL_RATE_INVALID ? "BAD" :
2877 iwl_rate_mcs[index].mbps);
1a61b347
ES		 2878 }
2879
2880 if (rate & RATE_MCS_VHT_MSK) {
2881 type = "VHT";
2882 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2883 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2884 >> RATE_VHT_MCS_NSS_POS) + 1;
2885 } else if (rate & RATE_MCS_HT_MSK) {
2886 type = "HT";
2887 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2888 } else {
2889 type = "Unknown"; /* shouldn't happen */
2890 }
2891
2892 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2893 case RATE_MCS_CHAN_WIDTH_20:
2894 bw = "20Mhz";
2895 break;
2896 case RATE_MCS_CHAN_WIDTH_40:
2897 bw = "40Mhz";
2898 break;
2899 case RATE_MCS_CHAN_WIDTH_80:
2900 bw = "80Mhz";
2901 break;
2902 case RATE_MCS_CHAN_WIDTH_160:
2903 bw = "160Mhz";
2904 break;
2905 default:
2906 bw = "BAD BW";
2907 }
2908
2909 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
5aa33553 2910 type, rs_pretty_ant(ant), bw, mcs, nss,
1a61b347 2911 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
7b1dd048 2912 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
1a61b347
ES		 2913 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2914 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2915 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2916}
2917
a0c38b21
ES		 2918/**
2919 * Program the device to use fixed rate for frame transmit
2920 * This is for debugging/testing only
2921 * once the device start use fixed rate, we need to reload the module
2922 * to being back the normal operation.
2923 */
2924static void rs_program_fix_rate(struct iwl_mvm *mvm,
2925 struct iwl_lq_sta *lq_sta)
2926{
2927 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2928 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2929 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2930
2931 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
ae969afe 2932 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
a0c38b21 2933
ae969afe 2934 if (lq_sta->pers.dbg_fixed_rate) {
8fc7c58c 2935 struct rs_rate rate;
ae969afe 2936 rs_rate_from_ucode_rate(lq_sta->pers.dbg_fixed_rate,
8fc7c58c 2937 lq_sta->band, &rate);
80e9e5cd 2938 rs_fill_lq_cmd(mvm, NULL, lq_sta, &rate);
ae969afe 2939 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
a0c38b21
ES		 2940 }
2941}
2942
9d10849e
EG		 2943static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2944 const char __user *user_buf, size_t count, loff_t *ppos)
2945{
2946 struct iwl_lq_sta *lq_sta = file->private_data;
2947 struct iwl_mvm *mvm;
2948 char buf[64];
2949 size_t buf_size;
2950 u32 parsed_rate;
2951
ae969afe 2952 mvm = lq_sta->pers.drv;
9d10849e
EG		 2953 memset(buf, 0, sizeof(buf));
2954 buf_size = min(count, sizeof(buf) - 1);
2955 if (copy_from_user(buf, user_buf, buf_size))
2956 return -EFAULT;
2957
2958 if (sscanf(buf, "%x", &parsed_rate) == 1)
ae969afe 2959 lq_sta->pers.dbg_fixed_rate = parsed_rate;
9d10849e 2960 else
ae969afe 2961 lq_sta->pers.dbg_fixed_rate = 0;
9d10849e
EG		 2962
2963 rs_program_fix_rate(mvm, lq_sta);
2964
2965 return count;
2966}
2967
8ca151b5
JB		 2968static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2969 char __user *user_buf, size_t count, loff_t *ppos)
2970{
2971 char *buff;
2972 int desc = 0;
2973 int i = 0;
8ca151b5
JB		 2974 ssize_t ret;
2975
2976 struct iwl_lq_sta *lq_sta = file->private_data;
2977 struct iwl_mvm *mvm;
2978 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 2979 struct rs_rate *rate = &tbl->rate;
ae969afe 2980 mvm = lq_sta->pers.drv;
1a61b347 2981 buff = kmalloc(2048, GFP_KERNEL);
8ca151b5
JB		 2982 if (!buff)
2983 return -ENOMEM;
2984
2985 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
198266a3 2986 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
8ca151b5
JB		 2987 lq_sta->total_failed, lq_sta->total_success,
2988 lq_sta->active_legacy_rate);
2989 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
ae969afe 2990 lq_sta->pers.dbg_fixed_rate);
8ca151b5 2991 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
4ed735e7
JB		 2992 (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
2993 (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
2994 (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
8ca151b5 2995 desc += sprintf(buff+desc, "lq type %s\n",
5aa33553
ES		 2996 (is_legacy(rate)) ? "legacy" :
2997 is_vht(rate) ? "VHT" : "HT");
2998 if (!is_legacy(rate)) {
8ca151b5 2999 desc += sprintf(buff+desc, " %s",
5aa33553 3000 (is_siso(rate)) ? "SISO" : "MIMO2");
8ca151b5 3001 desc += sprintf(buff+desc, " %s",
5aa33553
ES		 3002 (is_ht20(rate)) ? "20MHz" :
3003 (is_ht40(rate)) ? "40MHz" :
3004 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
6a524f48 3005 desc += sprintf(buff+desc, " %s %s\n",
5aa33553 3006 (rate->sgi) ? "SGI" : "NGI",
6a524f48 3007 (lq_sta->is_agg) ? "AGG on" : "");
8ca151b5
JB		 3008 }
3009 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3010 lq_sta->last_rate_n_flags);
3011 desc += sprintf(buff+desc,
1a61b347 3012 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
8ca151b5
JB		 3013 lq_sta->lq.flags,
3014 lq_sta->lq.mimo_delim,
3015 lq_sta->lq.single_stream_ant_msk,
3016 lq_sta->lq.dual_stream_ant_msk);
3017
3018 desc += sprintf(buff+desc,
3019 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3020 le16_to_cpu(lq_sta->lq.agg_time_limit),
3021 lq_sta->lq.agg_disable_start_th,
3022 lq_sta->lq.agg_frame_cnt_limit);
3023
2fd647f8 3024 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
8ca151b5
JB		 3025 desc += sprintf(buff+desc,
3026 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3027 lq_sta->lq.initial_rate_index[0],
3028 lq_sta->lq.initial_rate_index[1],
3029 lq_sta->lq.initial_rate_index[2],
3030 lq_sta->lq.initial_rate_index[3]);
3031
3032 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
cf4ef654 3033 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
1a61b347 3034
cf4ef654
JB		 3035 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3036 desc += rs_pretty_print_rate(buff+desc, r);
8ca151b5
JB		 3037 }
3038
3039 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3040 kfree(buff);
3041 return ret;
3042}
3043
3044static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3045 .write = rs_sta_dbgfs_scale_table_write,
3046 .read = rs_sta_dbgfs_scale_table_read,
3047 .open = simple_open,
3048 .llseek = default_llseek,
3049};
3050static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3051 char __user *user_buf, size_t count, loff_t *ppos)
3052{
3053 char *buff;
3054 int desc = 0;
3055 int i, j;
3056 ssize_t ret;
d310e405 3057 struct iwl_scale_tbl_info *tbl;
5aa33553 3058 struct rs_rate *rate;
8ca151b5
JB		 3059 struct iwl_lq_sta *lq_sta = file->private_data;
3060
3061 buff = kmalloc(1024, GFP_KERNEL);
3062 if (!buff)
3063 return -ENOMEM;
3064
3065 for (i = 0; i < LQ_SIZE; i++) {
d310e405 3066 tbl = &(lq_sta->lq_info[i]);
5aa33553 3067 rate = &tbl->rate;
8ca151b5 3068 desc += sprintf(buff+desc,
6a524f48 3069 "%s type=%d SGI=%d BW=%s DUP=0\n"
8fc7c58c 3070 "index=%d\n",
8ca151b5 3071 lq_sta->active_tbl == i ? "*" : "x",
5aa33553
ES		 3072 rate->type,
3073 rate->sgi,
3074 is_ht20(rate) ? "20Mhz" :
3075 is_ht40(rate) ? "40Mhz" :
3076 is_ht80(rate) ? "80Mhz" : "ERR",
8fc7c58c 3077 rate->index);
8ca151b5
JB		 3078 for (j = 0; j < IWL_RATE_COUNT; j++) {
3079 desc += sprintf(buff+desc,
3080 "counter=%d success=%d %%=%d\n",
d310e405
ES		 3081 tbl->win[j].counter,
3082 tbl->win[j].success_counter,
3083 tbl->win[j].success_ratio);
8ca151b5
JB		 3084 }
3085 }
3086 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3087 kfree(buff);
3088 return ret;
3089}
3090
3091static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3092 .read = rs_sta_dbgfs_stats_table_read,
3093 .open = simple_open,
3094 .llseek = default_llseek,
3095};
3096
757cf23b
ES		 3097static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3098 char __user *user_buf,
3099 size_t count, loff_t *ppos)
3100{
3101 static const char * const column_name[] = {
3102 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3103 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3104 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3105 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3106 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3107 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3108 [RS_COLUMN_MIMO2] = "MIMO2",
3109 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3110 };
3111
3112 static const char * const rate_name[] = {
3113 [IWL_RATE_1M_INDEX] = "1M",
3114 [IWL_RATE_2M_INDEX] = "2M",
3115 [IWL_RATE_5M_INDEX] = "5.5M",
3116 [IWL_RATE_11M_INDEX] = "11M",
3117 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3118 [IWL_RATE_9M_INDEX] = "9M",
3119 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3120 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3121 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3122 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3123 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3124 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3125 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3126 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3127 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3128 };
3129
3130 char *buff, *pos, *endpos;
3131 int col, rate;
3132 ssize_t ret;
3133 struct iwl_lq_sta *lq_sta = file->private_data;
3134 struct rs_rate_stats *stats;
3135 static const size_t bufsz = 1024;
3136
3137 buff = kmalloc(bufsz, GFP_KERNEL);
3138 if (!buff)
3139 return -ENOMEM;
3140
3141 pos = buff;
3142 endpos = pos + bufsz;
3143
3144 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3145 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3146 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3147 pos += scnprintf(pos, endpos - pos, "\n");
3148
3149 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3150 pos += scnprintf(pos, endpos - pos,
3151 "%s,", column_name[col]);
3152
3153 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3154 stats = &(lq_sta->tx_stats[col][rate]);
3155 pos += scnprintf(pos, endpos - pos,
3156 "%llu/%llu,",
3157 stats->success,
3158 stats->total);
3159 }
3160 pos += scnprintf(pos, endpos - pos, "\n");
3161 }
3162
3163 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3164 kfree(buff);
3165 return ret;
3166}
3167
3168static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3169 const char __user *user_buf,
3170 size_t count, loff_t *ppos)
3171{
3172 struct iwl_lq_sta *lq_sta = file->private_data;
3173 memset(lq_sta->tx_stats, 0, sizeof(lq_sta->tx_stats));
3174
3175 return count;
3176}
3177
3178static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3179 .read = rs_sta_dbgfs_drv_tx_stats_read,
3180 .write = rs_sta_dbgfs_drv_tx_stats_write,
3181 .open = simple_open,
3182 .llseek = default_llseek,
3183};
3184
8ca151b5
JB		 3185static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3186{
3187 struct iwl_lq_sta *lq_sta = mvm_sta;
c6e1faad
EP		 3188 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3189 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3190 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3191 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3192 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3193 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3194 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3195 &lq_sta->tx_agg_tid_en);
3196 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3197 &lq_sta->pers.dbg_fixed_txp_reduction);
8ca151b5
JB		 3198}
3199
3200static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3201{
8ca151b5
JB		 3202}
3203#endif
3204
3205/*
3206 * Initialization of rate scaling information is done by driver after
3207 * the station is added. Since mac80211 calls this function before a
3208 * station is added we ignore it.
3209 */
3210static void rs_rate_init_stub(void *mvm_r,
3de805cf
SW		 3211 struct ieee80211_supported_band *sband,
3212 struct cfg80211_chan_def *chandef,
3213 struct ieee80211_sta *sta, void *mvm_sta)
8ca151b5
JB		 3214{
3215}
631ad703
JB		 3216
3217static const struct rate_control_ops rs_mvm_ops = {
8ca151b5
JB		 3218 .name = RS_NAME,
3219 .tx_status = rs_tx_status,
3220 .get_rate = rs_get_rate,
3221 .rate_init = rs_rate_init_stub,
3222 .alloc = rs_alloc,
3223 .free = rs_free,
3224 .alloc_sta = rs_alloc_sta,
3225 .free_sta = rs_free_sta,
b87c2179 3226 .rate_update = rs_rate_update,
8ca151b5
JB		 3227#ifdef CONFIG_MAC80211_DEBUGFS
3228 .add_sta_debugfs = rs_add_debugfs,
3229 .remove_sta_debugfs = rs_remove_debugfs,
3230#endif
3231};
3232
3233int iwl_mvm_rate_control_register(void)
3234{
3235 return ieee80211_rate_control_register(&rs_mvm_ops);
3236}
3237
3238void iwl_mvm_rate_control_unregister(void)
3239{
3240 ieee80211_rate_control_unregister(&rs_mvm_ops);
3241}
9ee718aa
EL		 3242
3243/**
3244 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3245 * Tx protection, according to this rquest and previous requests,
3246 * and send the LQ command.
9ee718aa
EL		 3247 * @mvmsta: The station
3248 * @enable: Enable Tx protection?
3249 */
e126b5d9
JB		 3250int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3251 bool enable)
9ee718aa 3252{
e126b5d9
JB		 3253 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3254
9ee718aa
EL		 3255 lockdep_assert_held(&mvm->mutex);
3256
3257 if (enable) {
3258 if (mvmsta->tx_protection == 0)
d307ec8d 3259 lq->flags |= LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 3260 mvmsta->tx_protection++;
3261 } else {
3262 mvmsta->tx_protection--;
3263 if (mvmsta->tx_protection == 0)
d307ec8d 3264 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 3265 }
3266
9e680946 3267 return iwl_mvm_send_lq_cmd(mvm, lq, false);
9ee718aa 3268}
Linux kernel - Deliverables
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