]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - drivers/net/wireless/iwlwifi/mvm/rs.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
iwlwifi: mvm: rs: refactor building the LQ command
[mirror_ubuntu-artful-kernel.git] / drivers / net / wireless / iwlwifi / mvm / rs.c
CommitLineData
8ca151b5
JB		 1/******************************************************************************
2 *
3 * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
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>
27#include <linux/init.h>
28#include <linux/skbuff.h>
29#include <linux/slab.h>
30#include <net/mac80211.h>
31
32#include <linux/netdevice.h>
33#include <linux/etherdevice.h>
34#include <linux/delay.h>
35
36#include <linux/workqueue.h>
37#include "rs.h"
38#include "fw-api.h"
39#include "sta.h"
40#include "iwl-op-mode.h"
41#include "mvm.h"
42
43#define RS_NAME "iwl-mvm-rs"
44
45#define NUM_TRY_BEFORE_ANT_TOGGLE 1
46#define IWL_NUMBER_TRY 1
47#define IWL_HT_NUMBER_TRY 3
48
49#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
d17334c4 50#define IWL_RATE_MIN_FAILURE_TH 3 /* min failures to calc tpt */
8ca151b5
JB		 51#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52
53/* max allowed rate miss before sync LQ cmd */
54#define IWL_MISSED_RATE_MAX 15
32b01726
ES		 55#define RS_STAY_IN_COLUMN_TIMEOUT (5*HZ)
56
8ca151b5
JB		 57
58static u8 rs_ht_to_legacy[] = {
da87d7d5
ES		 59 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
60 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
61 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
62 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
63 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
64 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
65 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
66 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
67 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
68 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
8ca151b5
JB		 69};
70
71static const u8 ant_toggle_lookup[] = {
ef4394b9
EP		 72 [ANT_NONE] = ANT_NONE,
73 [ANT_A] = ANT_B,
74 [ANT_B] = ANT_C,
75 [ANT_AB] = ANT_BC,
76 [ANT_C] = ANT_A,
77 [ANT_AC] = ANT_AB,
78 [ANT_BC] = ANT_AC,
79 [ANT_ABC] = ANT_ABC,
8ca151b5
JB		 80};
81
d310e405
ES		 82#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
83 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
84 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
85 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
86 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
87 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
88 IWL_RATE_##rp##M_INDEX, \
ab055ce9 89 IWL_RATE_##rn##M_INDEX }
8ca151b5 90
d310e405
ES		 91#define IWL_DECLARE_MCS_RATE(s) \
92 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
93 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
94 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
95 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
96 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
97 IWL_RATE_INVM_INDEX, \
98 IWL_RATE_INVM_INDEX }
99
8ca151b5
JB		 100/*
101 * Parameter order:
ab055ce9 102 * rate, ht rate, prev rate, next rate
8ca151b5
JB		 103 *
104 * If there isn't a valid next or previous rate then INV is used which
105 * maps to IWL_RATE_INVALID
106 *
107 */
108static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
ab055ce9
ES		 109 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
110 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
111 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
112 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
d310e405
ES		 113 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
114 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
115 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
116 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
117 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
118 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
119 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
120 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
121 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
122 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
123 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
8ca151b5
JB		 124};
125
b3b06a32
ES		 126enum rs_column_mode {
127 RS_INVALID = 0,
128 RS_LEGACY,
129 RS_SISO,
130 RS_MIMO2,
131};
132
133#define MAX_NEXT_COLUMNS 5
134#define MAX_COLUMN_CHECKS 3
135
136typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
137 struct ieee80211_sta *sta,
138 struct iwl_scale_tbl_info *tbl);
139
140struct rs_tx_column {
141 enum rs_column_mode mode;
142 u8 ant;
143 bool sgi;
144 enum rs_column next_columns[MAX_NEXT_COLUMNS];
145 allow_column_func_t checks[MAX_COLUMN_CHECKS];
146};
147
148static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
149 struct iwl_scale_tbl_info *tbl)
150{
151 if (!sta->ht_cap.ht_supported)
152 return false;
153
154 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
155 return false;
156
157 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
158 return false;
159
160 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
161 return false;
162
163 return true;
164}
165
166static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
167 struct iwl_scale_tbl_info *tbl)
168{
169 if (!sta->ht_cap.ht_supported)
170 return false;
171
172 return true;
173}
174
175static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
176 struct iwl_scale_tbl_info *tbl)
177{
178 struct rs_rate *rate = &tbl->rate;
179 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
180 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
181
182 if (is_ht20(rate) && (ht_cap->cap &
183 IEEE80211_HT_CAP_SGI_20))
184 return true;
185 if (is_ht40(rate) && (ht_cap->cap &
186 IEEE80211_HT_CAP_SGI_40))
187 return true;
188 if (is_ht80(rate) && (vht_cap->cap &
189 IEEE80211_VHT_CAP_SHORT_GI_80))
190 return true;
191
192 return false;
193}
194
195static const struct rs_tx_column rs_tx_columns[] = {
196 [RS_COLUMN_LEGACY_ANT_A] = {
197 .mode = RS_LEGACY,
198 .ant = ANT_A,
199 .next_columns = {
200 RS_COLUMN_LEGACY_ANT_B,
201 RS_COLUMN_SISO_ANT_A,
202 RS_COLUMN_MIMO2,
203 RS_COLUMN_INVALID,
204 RS_COLUMN_INVALID,
205 },
206 },
207 [RS_COLUMN_LEGACY_ANT_B] = {
208 .mode = RS_LEGACY,
209 .ant = ANT_B,
210 .next_columns = {
211 RS_COLUMN_LEGACY_ANT_A,
212 RS_COLUMN_SISO_ANT_B,
213 RS_COLUMN_MIMO2,
214 RS_COLUMN_INVALID,
215 RS_COLUMN_INVALID,
216 },
217 },
218 [RS_COLUMN_SISO_ANT_A] = {
219 .mode = RS_SISO,
220 .ant = ANT_A,
221 .next_columns = {
222 RS_COLUMN_SISO_ANT_B,
223 RS_COLUMN_MIMO2,
224 RS_COLUMN_SISO_ANT_A_SGI,
225 RS_COLUMN_INVALID,
226 RS_COLUMN_INVALID,
227 },
228 .checks = {
229 rs_siso_allow,
230 },
231 },
232 [RS_COLUMN_SISO_ANT_B] = {
233 .mode = RS_SISO,
234 .ant = ANT_B,
235 .next_columns = {
236 RS_COLUMN_SISO_ANT_A,
237 RS_COLUMN_MIMO2,
238 RS_COLUMN_SISO_ANT_B_SGI,
239 RS_COLUMN_INVALID,
240 RS_COLUMN_INVALID,
241 },
242 .checks = {
243 rs_siso_allow,
244 },
245 },
246 [RS_COLUMN_SISO_ANT_A_SGI] = {
247 .mode = RS_SISO,
248 .ant = ANT_A,
249 .sgi = true,
250 .next_columns = {
251 RS_COLUMN_SISO_ANT_B_SGI,
252 RS_COLUMN_MIMO2_SGI,
253 RS_COLUMN_SISO_ANT_A,
254 RS_COLUMN_INVALID,
255 RS_COLUMN_INVALID,
256 },
257 .checks = {
258 rs_siso_allow,
259 rs_sgi_allow,
260 },
261 },
262 [RS_COLUMN_SISO_ANT_B_SGI] = {
263 .mode = RS_SISO,
264 .ant = ANT_B,
265 .sgi = true,
266 .next_columns = {
267 RS_COLUMN_SISO_ANT_A_SGI,
268 RS_COLUMN_MIMO2_SGI,
269 RS_COLUMN_SISO_ANT_B,
270 RS_COLUMN_INVALID,
271 RS_COLUMN_INVALID,
272 },
273 .checks = {
274 rs_siso_allow,
275 rs_sgi_allow,
276 },
277 },
278 [RS_COLUMN_MIMO2] = {
279 .mode = RS_MIMO2,
280 .ant = ANT_AB,
281 .next_columns = {
282 RS_COLUMN_SISO_ANT_A,
283 RS_COLUMN_MIMO2_SGI,
284 RS_COLUMN_INVALID,
285 RS_COLUMN_INVALID,
286 RS_COLUMN_INVALID,
287 },
288 .checks = {
289 rs_mimo_allow,
290 },
291 },
292 [RS_COLUMN_MIMO2_SGI] = {
293 .mode = RS_MIMO2,
294 .ant = ANT_AB,
295 .sgi = true,
296 .next_columns = {
297 RS_COLUMN_SISO_ANT_A_SGI,
298 RS_COLUMN_MIMO2,
299 RS_COLUMN_INVALID,
300 RS_COLUMN_INVALID,
301 RS_COLUMN_INVALID,
302 },
303 .checks = {
304 rs_mimo_allow,
305 rs_sgi_allow,
306 },
307 },
308};
309
8ca151b5
JB		 310static inline u8 rs_extract_rate(u32 rate_n_flags)
311{
312 /* also works for HT because bits 7:6 are zero there */
313 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
314}
315
316static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
317{
318 int idx = 0;
319
8ca151b5 320 if (rate_n_flags & RATE_MCS_HT_MSK) {
d310e405
ES		 321 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
322 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 323
d310e405 324 /* skip 9M not supported in HT*/
8ca151b5
JB		 325 if (idx >= IWL_RATE_9M_INDEX)
326 idx += 1;
4e82dd3a 327 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
8ca151b5 328 return idx;
d310e405
ES		 329 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
330 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
331 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 332
d310e405
ES		 333 /* skip 9M not supported in VHT*/
334 if (idx >= IWL_RATE_9M_INDEX)
335 idx++;
336 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
337 return idx;
8ca151b5 338 } else {
d310e405
ES		 339 /* legacy rate format, search for match in table */
340
341 u8 legacy_rate = rs_extract_rate(rate_n_flags);
8ca151b5 342 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
d310e405 343 if (iwl_rates[idx].plcp == legacy_rate)
8ca151b5
JB		 344 return idx;
345 }
346
347 return -1;
348}
349
350static void rs_rate_scale_perform(struct iwl_mvm *mvm,
351 struct sk_buff *skb,
352 struct ieee80211_sta *sta,
353 struct iwl_lq_sta *lq_sta);
8fc7c58c
ES		 354static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
355 struct ieee80211_sta *sta,
356 struct iwl_lq_sta *lq_sta,
357 const struct rs_rate *initial_rate);
8ca151b5 358static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
8ca151b5 359
8ca151b5
JB		 360/**
361 * The following tables contain the expected throughput metrics for all rates
362 *
363 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
364 *
365 * where invalid entries are zeros.
366 *
367 * CCK rates are only valid in legacy table and will only be used in G
368 * (2.4 GHz) band.
369 */
370
371static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
4e82dd3a 372 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
8ca151b5
JB		 373};
374
4e82dd3a
ES		 375/* Expected TpT tables. 4 indexes:
376 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
377 */
378static s32 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
379 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
380 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
381 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
382 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
8ca151b5
JB		 383};
384
4e82dd3a
ES		 385static s32 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
386 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
387 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
388 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
389 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
8ca151b5
JB		 390};
391
d310e405
ES		 392static s32 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
393 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
394 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
395 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
396 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
397};
398
8ca151b5 399static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 400 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
401 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
402 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
403 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
8ca151b5
JB		 404};
405
406static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 407 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
408 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
409 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
410 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
8ca151b5
JB		 411};
412
d310e405
ES		 413static s32 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
414 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
415 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
416 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
417 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
418};
419
8ca151b5
JB		 420/* mbps, mcs */
421static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
422 { "1", "BPSK DSSS"},
423 { "2", "QPSK DSSS"},
424 {"5.5", "BPSK CCK"},
425 { "11", "QPSK CCK"},
426 { "6", "BPSK 1/2"},
427 { "9", "BPSK 1/2"},
428 { "12", "QPSK 1/2"},
429 { "18", "QPSK 3/4"},
430 { "24", "16QAM 1/2"},
431 { "36", "16QAM 3/4"},
432 { "48", "64QAM 2/3"},
433 { "54", "64QAM 3/4"},
434 { "60", "64QAM 5/6"},
435};
436
437#define MCS_INDEX_PER_STREAM (8)
438
9d10849e
EG		 439static const char *rs_pretty_ant(u8 ant)
440{
441 static const char * const ant_name[] = {
442 [ANT_NONE] = "None",
443 [ANT_A] = "A",
444 [ANT_B] = "B",
445 [ANT_AB] = "AB",
446 [ANT_C] = "C",
447 [ANT_AC] = "AC",
448 [ANT_BC] = "BC",
449 [ANT_ABC] = "ABC",
450 };
451
452 if (ant > ANT_ABC)
453 return "UNKNOWN";
454
455 return ant_name[ant];
456}
457
458static const char *rs_pretty_lq_type(enum iwl_table_type type)
459{
460 static const char * const lq_types[] = {
461 [LQ_NONE] = "NONE",
462 [LQ_LEGACY_A] = "LEGACY_A",
463 [LQ_LEGACY_G] = "LEGACY_G",
464 [LQ_HT_SISO] = "HT SISO",
465 [LQ_HT_MIMO2] = "HT MIMO",
466 [LQ_VHT_SISO] = "VHT SISO",
467 [LQ_VHT_MIMO2] = "VHT MIMO",
468 };
469
470 if (type < LQ_NONE || type >= LQ_MAX)
471 return "UNKNOWN";
472
473 return lq_types[type];
474}
475
5aa33553
ES		 476static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
477 const char *prefix)
478{
479 IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
480 prefix, rs_pretty_lq_type(rate->type),
481 rate->index, rs_pretty_ant(rate->ant),
482 rate->bw, rate->sgi);
483}
484
8ca151b5
JB		 485static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
486{
487 window->data = 0;
488 window->success_counter = 0;
489 window->success_ratio = IWL_INVALID_VALUE;
490 window->counter = 0;
491 window->average_tpt = IWL_INVALID_VALUE;
8ca151b5
JB		 492}
493
494static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
495{
496 return (ant_type & valid_antenna) == ant_type;
497}
498
8ca151b5
JB		 499static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
500 struct iwl_lq_sta *lq_data, u8 tid,
501 struct ieee80211_sta *sta)
502{
503 int ret = -EAGAIN;
8ca151b5 504
44cc429c
EG		 505 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
506 sta->addr, tid);
507 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
508 if (ret == -EAGAIN) {
509 /*
510 * driver and mac80211 is out of sync
511 * this might be cause by reloading firmware
512 * stop the tx ba session here
513 */
514 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
515 tid);
516 ieee80211_stop_tx_ba_session(sta, tid);
8ca151b5
JB		 517 }
518 return ret;
519}
520
521static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
522 struct iwl_lq_sta *lq_data,
523 struct ieee80211_sta *sta)
524{
525 if (tid < IWL_MAX_TID_COUNT)
526 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
527 else
528 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
529 tid, IWL_MAX_TID_COUNT);
530}
531
532static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
533{
534 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
535 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
536 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
537}
538
539/*
540 * Static function to get the expected throughput from an iwl_scale_tbl_info
541 * that wraps a NULL pointer check
542 */
543static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
544{
545 if (tbl->expected_tpt)
546 return tbl->expected_tpt[rs_index];
547 return 0;
548}
549
550/**
551 * rs_collect_tx_data - Update the success/failure sliding window
552 *
553 * We keep a sliding window of the last 62 packets transmitted
554 * at this rate. window->data contains the bitmask of successful
555 * packets.
556 */
557static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
558 int scale_index, int attempts, int successes)
559{
560 struct iwl_rate_scale_data *window = NULL;
561 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
562 s32 fail_count, tpt;
563
564 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
565 return -EINVAL;
566
567 /* Select window for current tx bit rate */
568 window = &(tbl->win[scale_index]);
569
570 /* Get expected throughput */
571 tpt = get_expected_tpt(tbl, scale_index);
572
573 /*
574 * Keep track of only the latest 62 tx frame attempts in this rate's
575 * history window; anything older isn't really relevant any more.
576 * If we have filled up the sliding window, drop the oldest attempt;
577 * if the oldest attempt (highest bit in bitmap) shows "success",
578 * subtract "1" from the success counter (this is the main reason
579 * we keep these bitmaps!).
580 */
581 while (attempts > 0) {
582 if (window->counter >= IWL_RATE_MAX_WINDOW) {
583 /* remove earliest */
584 window->counter = IWL_RATE_MAX_WINDOW - 1;
585
586 if (window->data & mask) {
587 window->data &= ~mask;
588 window->success_counter--;
589 }
590 }
591
592 /* Increment frames-attempted counter */
593 window->counter++;
594
595 /* Shift bitmap by one frame to throw away oldest history */
596 window->data <<= 1;
597
598 /* Mark the most recent #successes attempts as successful */
599 if (successes > 0) {
600 window->success_counter++;
601 window->data |= 0x1;
602 successes--;
603 }
604
605 attempts--;
606 }
607
608 /* Calculate current success ratio, avoid divide-by-0! */
609 if (window->counter > 0)
610 window->success_ratio = 128 * (100 * window->success_counter)
611 / window->counter;
612 else
613 window->success_ratio = IWL_INVALID_VALUE;
614
615 fail_count = window->counter - window->success_counter;
616
617 /* Calculate average throughput, if we have enough history. */
618 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
619 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
620 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
621 else
622 window->average_tpt = IWL_INVALID_VALUE;
623
8ca151b5
JB		 624 return 0;
625}
626
5aa33553
ES		 627/* Convert rs_rate object into ucode rate bitmask */
628static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
8fc7c58c 629 struct rs_rate *rate)
8ca151b5 630{
5aa33553
ES		 631 u32 ucode_rate = 0;
632 int index = rate->index;
8ca151b5 633
5aa33553 634 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
d310e405
ES		 635 RATE_MCS_ANT_ABC_MSK);
636
5aa33553
ES		 637 if (is_legacy(rate)) {
638 ucode_rate |= iwl_rates[index].plcp;
8ca151b5 639 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
5aa33553
ES		 640 ucode_rate |= RATE_MCS_CCK_MSK;
641 return ucode_rate;
d310e405
ES		 642 }
643
5aa33553 644 if (is_ht(rate)) {
d310e405 645 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
8ca151b5 646 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
4e82dd3a 647 index = IWL_LAST_HT_RATE;
8ca151b5 648 }
5aa33553 649 ucode_rate |= RATE_MCS_HT_MSK;
8ca151b5 650
5aa33553
ES		 651 if (is_ht_siso(rate))
652 ucode_rate |= iwl_rates[index].plcp_ht_siso;
653 else if (is_ht_mimo2(rate))
654 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
8ca151b5 655 else
d972ab31 656 WARN_ON_ONCE(1);
5aa33553 657 } else if (is_vht(rate)) {
d310e405
ES		 658 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
659 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
660 index = IWL_LAST_VHT_RATE;
661 }
5aa33553
ES		 662 ucode_rate |= RATE_MCS_VHT_MSK;
663 if (is_vht_siso(rate))
664 ucode_rate |= iwl_rates[index].plcp_vht_siso;
665 else if (is_vht_mimo2(rate))
666 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
d310e405
ES		 667 else
668 WARN_ON_ONCE(1);
669
8ca151b5 670 } else {
5aa33553 671 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
8ca151b5
JB		 672 }
673
5aa33553
ES		 674 ucode_rate |= rate->bw;
675 if (rate->sgi)
676 ucode_rate |= RATE_MCS_SGI_MSK;
d310e405 677
5aa33553 678 return ucode_rate;
8ca151b5
JB		 679}
680
5aa33553
ES		 681/* Convert a ucode rate into an rs_rate object */
682static int rs_rate_from_ucode_rate(const u32 ucode_rate,
683 enum ieee80211_band band,
684 struct rs_rate *rate)
8ca151b5 685{
5aa33553
ES		 686 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
687 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
d310e405 688 u8 nss;
8ca151b5 689
5aa33553
ES		 690 memset(rate, 0, sizeof(struct rs_rate));
691 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
8ca151b5 692
5aa33553
ES		 693 if (rate->index == IWL_RATE_INVALID) {
694 rate->index = -1;
8ca151b5
JB		 695 return -EINVAL;
696 }
5aa33553
ES		 697
698 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
8ca151b5 699
d310e405 700 /* Legacy */
5aa33553
ES		 701 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
702 !(ucode_rate & RATE_MCS_VHT_MSK)) {
8ca151b5
JB		 703 if (num_of_ant == 1) {
704 if (band == IEEE80211_BAND_5GHZ)
5aa33553 705 rate->type = LQ_LEGACY_A;
8ca151b5 706 else
5aa33553 707 rate->type = LQ_LEGACY_G;
8ca151b5 708 }
d310e405
ES		 709
710 return 0;
711 }
712
713 /* HT or VHT */
5aa33553
ES		 714 if (ucode_rate & RATE_MCS_SGI_MSK)
715 rate->sgi = true;
d310e405 716
5aa33553 717 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
d310e405 718
5aa33553
ES		 719 if (ucode_rate & RATE_MCS_HT_MSK) {
720 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
d310e405
ES		 721 RATE_HT_MCS_NSS_POS) + 1;
722
723 if (nss == 1) {
5aa33553 724 rate->type = LQ_HT_SISO;
d310e405
ES		 725 WARN_ON_ONCE(num_of_ant != 1);
726 } else if (nss == 2) {
5aa33553 727 rate->type = LQ_HT_MIMO2;
d310e405 728 WARN_ON_ONCE(num_of_ant != 2);
8ca151b5 729 } else {
d310e405
ES		 730 WARN_ON_ONCE(1);
731 }
5aa33553
ES		 732 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
733 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
d310e405
ES		 734 RATE_VHT_MCS_NSS_POS) + 1;
735
736 if (nss == 1) {
5aa33553 737 rate->type = LQ_VHT_SISO;
d310e405
ES		 738 WARN_ON_ONCE(num_of_ant != 1);
739 } else if (nss == 2) {
5aa33553 740 rate->type = LQ_VHT_MIMO2;
d310e405
ES		 741 WARN_ON_ONCE(num_of_ant != 2);
742 } else {
743 WARN_ON_ONCE(1);
8ca151b5
JB		 744 }
745 }
d310e405 746
5aa33553
ES		 747 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
748 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
749 !is_vht(rate));
d310e405 750
8ca151b5
JB		 751 return 0;
752}
753
754/* switch to another antenna/antennas and return 1 */
755/* if no other valid antenna found, return 0 */
8fc7c58c 756static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
8ca151b5
JB		 757{
758 u8 new_ant_type;
759
5aa33553 760 if (!rate->ant || rate->ant > ANT_ABC)
8ca151b5
JB		 761 return 0;
762
5aa33553 763 if (!rs_is_valid_ant(valid_ant, rate->ant))
8ca151b5
JB		 764 return 0;
765
5aa33553 766 new_ant_type = ant_toggle_lookup[rate->ant];
8ca151b5 767
5aa33553 768 while ((new_ant_type != rate->ant) &&
8ca151b5
JB		 769 !rs_is_valid_ant(valid_ant, new_ant_type))
770 new_ant_type = ant_toggle_lookup[new_ant_type];
771
5aa33553 772 if (new_ant_type == rate->ant)
8ca151b5
JB		 773 return 0;
774
5aa33553
ES		 775 rate->ant = new_ant_type;
776
8ca151b5
JB		 777 return 1;
778}
779
8ca151b5 780static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
5aa33553 781 struct rs_rate *rate)
8ca151b5 782{
5aa33553 783 if (is_legacy(rate))
8ca151b5 784 return lq_sta->active_legacy_rate;
5aa33553 785 else if (is_siso(rate))
d310e405 786 return lq_sta->active_siso_rate;
5aa33553 787 else if (is_mimo2(rate))
d310e405
ES		 788 return lq_sta->active_mimo2_rate;
789
790 WARN_ON_ONCE(1);
791 return 0;
8ca151b5
JB		 792}
793
794static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
795 int rate_type)
796{
797 u8 high = IWL_RATE_INVALID;
798 u8 low = IWL_RATE_INVALID;
799
800 /* 802.11A or ht walks to the next literal adjacent rate in
801 * the rate table */
5aa33553 802 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
8ca151b5
JB		 803 int i;
804 u32 mask;
805
806 /* Find the previous rate that is in the rate mask */
807 i = index - 1;
808 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
809 if (rate_mask & mask) {
810 low = i;
811 break;
812 }
813 }
814
815 /* Find the next rate that is in the rate mask */
816 i = index + 1;
817 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
818 if (rate_mask & mask) {
819 high = i;
820 break;
821 }
822 }
823
824 return (high << 8) | low;
825 }
826
827 low = index;
828 while (low != IWL_RATE_INVALID) {
829 low = iwl_rates[low].prev_rs;
830 if (low == IWL_RATE_INVALID)
831 break;
832 if (rate_mask & (1 << low))
833 break;
834 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
835 }
836
837 high = index;
838 while (high != IWL_RATE_INVALID) {
839 high = iwl_rates[high].next_rs;
840 if (high == IWL_RATE_INVALID)
841 break;
842 if (rate_mask & (1 << high))
843 break;
844 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
845 }
846
847 return (high << 8) | low;
848}
849
8fc7c58c
ES		 850static void rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
851 struct rs_rate *rate,
852 u8 scale_index, u8 ht_possible)
8ca151b5
JB		 853{
854 s32 low;
855 u16 rate_mask;
856 u16 high_low;
857 u8 switch_to_legacy = 0;
8ca151b5
JB		 858 struct iwl_mvm *mvm = lq_sta->drv;
859
860 /* check if we need to switch from HT to legacy rates.
861 * assumption is that mandatory rates (1Mbps or 6Mbps)
862 * are always supported (spec demand) */
5aa33553 863 if (!is_legacy(rate) && (!ht_possible || !scale_index)) {
8ca151b5 864 switch_to_legacy = 1;
da87d7d5
ES		 865 WARN_ON_ONCE(scale_index < IWL_RATE_MCS_0_INDEX &&
866 scale_index > IWL_RATE_MCS_9_INDEX);
8ca151b5
JB		 867 scale_index = rs_ht_to_legacy[scale_index];
868 if (lq_sta->band == IEEE80211_BAND_5GHZ)
5aa33553 869 rate->type = LQ_LEGACY_A;
8ca151b5 870 else
5aa33553 871 rate->type = LQ_LEGACY_G;
8ca151b5 872
5aa33553
ES		 873 if (num_of_ant(rate->ant) > 1)
874 rate->ant =
ff402312 875 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
8ca151b5 876
a56db7d1 877 rate->bw = RATE_MCS_CHAN_WIDTH_20;
5aa33553 878 rate->sgi = false;
8ca151b5
JB		 879 }
880
a8ff14f5 881 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5
JB		 882
883 /* Mask with station rate restriction */
5aa33553 884 if (is_legacy(rate)) {
8ca151b5
JB		 885 /* supp_rates has no CCK bits in A mode */
886 if (lq_sta->band == IEEE80211_BAND_5GHZ)
5aa33553 887 rate_mask = (u16)(rate_mask &
8ca151b5
JB		 888 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
889 else
890 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
891 }
892
893 /* If we switched from HT to legacy, check current rate */
894 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
895 low = scale_index;
896 goto out;
897 }
898
899 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
5aa33553 900 rate->type);
8ca151b5
JB		 901 low = high_low & 0xff;
902
903 if (low == IWL_RATE_INVALID)
904 low = scale_index;
905
906out:
5aa33553 907 rate->index = low;
8ca151b5
JB		 908}
909
5aa33553
ES		 910/* Simple function to compare two rate scale table types */
911static inline bool rs_rate_match(struct rs_rate *a,
912 struct rs_rate *b)
8ca151b5 913{
5aa33553 914 return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
8ca151b5
JB		 915}
916
d310e405
ES		 917static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
918{
919 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
920 return RATE_MCS_CHAN_WIDTH_40;
921 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
922 return RATE_MCS_CHAN_WIDTH_80;
923 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
924 return RATE_MCS_CHAN_WIDTH_160;
925
926 return RATE_MCS_CHAN_WIDTH_20;
927}
928
8ca151b5
JB		 929/*
930 * mac80211 sends us Tx status
931 */
932static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
933 struct ieee80211_sta *sta, void *priv_sta,
934 struct sk_buff *skb)
935{
936 int legacy_success;
937 int retries;
5aa33553 938 int mac_index, i;
8ca151b5
JB		 939 struct iwl_lq_sta *lq_sta = priv_sta;
940 struct iwl_lq_cmd *table;
941 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
942 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
943 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
944 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
945 enum mac80211_rate_control_flags mac_flags;
5aa33553
ES		 946 u32 ucode_rate;
947 struct rs_rate rate;
8ca151b5
JB		 948 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
949
8ca151b5
JB		 950 /* Treat uninitialized rate scaling data same as non-existing. */
951 if (!lq_sta) {
952 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
953 return;
954 } else if (!lq_sta->drv) {
955 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
956 return;
957 }
958
959 if (!ieee80211_is_data(hdr->frame_control) ||
960 info->flags & IEEE80211_TX_CTL_NO_ACK)
961 return;
962
963 /* This packet was aggregated but doesn't carry status info */
964 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
965 !(info->flags & IEEE80211_TX_STAT_AMPDU))
966 return;
967
968 /*
969 * Ignore this Tx frame response if its initial rate doesn't match
970 * that of latest Link Quality command. There may be stragglers
971 * from a previous Link Quality command, but we're no longer interested
972 * in those; they're either from the "active" mode while we're trying
973 * to check "search" mode, or a prior "search" mode after we've moved
974 * to a new "search" mode (which might become the new "active" mode).
975 */
976 table = &lq_sta->lq;
5aa33553
ES		 977 ucode_rate = le32_to_cpu(table->rs_table[0]);
978 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5 979 if (info->band == IEEE80211_BAND_5GHZ)
5aa33553 980 rate.index -= IWL_FIRST_OFDM_RATE;
8ca151b5
JB		 981 mac_flags = info->status.rates[0].flags;
982 mac_index = info->status.rates[0].idx;
983 /* For HT packets, map MCS to PLCP */
984 if (mac_flags & IEEE80211_TX_RC_MCS) {
985 /* Remove # of streams */
986 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
987 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
988 mac_index++;
989 /*
990 * mac80211 HT index is always zero-indexed; we need to move
991 * HT OFDM rates after CCK rates in 2.4 GHz band
992 */
993 if (info->band == IEEE80211_BAND_2GHZ)
994 mac_index += IWL_FIRST_OFDM_RATE;
d310e405
ES		 995 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
996 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
997 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
998 mac_index++;
8ca151b5 999 }
d310e405 1000
8ca151b5
JB		 1001 /* Here we actually compare this rate to the latest LQ command */
1002 if ((mac_index < 0) ||
5aa33553
ES		 1003 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1004 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1005 (rate.ant != info->status.antenna) ||
1006 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
d310e405 1007 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
5aa33553 1008 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
d310e405 1009 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
5aa33553 1010 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
d310e405 1011 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
5aa33553 1012 (rate.index != mac_index)) {
8ca151b5
JB		 1013 IWL_DEBUG_RATE(mvm,
1014 "initial rate %d does not match %d (0x%x)\n",
5aa33553 1015 mac_index, rate.index, ucode_rate);
8ca151b5
JB		 1016 /*
1017 * Since rates mis-match, the last LQ command may have failed.
1018 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1019 * ... driver.
1020 */
1021 lq_sta->missed_rate_counter++;
1022 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1023 lq_sta->missed_rate_counter = 0;
b3b06a32
ES		 1024 IWL_DEBUG_RATE(mvm,
1025 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1026 lq_sta->rs_state);
9e680946 1027 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1028 }
1029 /* Regardless, ignore this status info for outdated rate */
1030 return;
1031 } else
1032 /* Rate did match, so reset the missed_rate_counter */
1033 lq_sta->missed_rate_counter = 0;
1034
1035 /* Figure out if rate scale algorithm is in active or search table */
5aa33553
ES		 1036 if (rs_rate_match(&rate,
1037 &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
8ca151b5
JB		 1038 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1039 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553
ES		 1040 } else if (rs_rate_match(&rate,
1041 &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
8ca151b5
JB		 1042 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1043 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1044 } else {
1045 IWL_DEBUG_RATE(mvm,
1046 "Neither active nor search matches tx rate\n");
1047 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 1048 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
8ca151b5 1049 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553
ES		 1050 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1051 rs_dump_rate(mvm, &rate, "ACTUAL");
1052
8ca151b5
JB		 1053 /*
1054 * no matching table found, let's by-pass the data collection
1055 * and continue to perform rate scale to find the rate table
1056 */
1057 rs_stay_in_table(lq_sta, true);
1058 goto done;
1059 }
1060
1061 /*
1062 * Updating the frame history depends on whether packets were
1063 * aggregated.
1064 *
1065 * For aggregation, all packets were transmitted at the same rate, the
1066 * first index into rate scale table.
1067 */
1068 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
5aa33553
ES		 1069 ucode_rate = le32_to_cpu(table->rs_table[0]);
1070 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1071 rs_collect_tx_data(curr_tbl, rate.index,
8ca151b5
JB		 1072 info->status.ampdu_len,
1073 info->status.ampdu_ack_len);
1074
1075 /* Update success/fail counts if not searching for new mode */
b3b06a32 1076 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1077 lq_sta->total_success += info->status.ampdu_ack_len;
1078 lq_sta->total_failed += (info->status.ampdu_len -
1079 info->status.ampdu_ack_len);
1080 }
1081 } else {
1082 /*
1083 * For legacy, update frame history with for each Tx retry.
1084 */
1085 retries = info->status.rates[0].count - 1;
1086 /* HW doesn't send more than 15 retries */
1087 retries = min(retries, 15);
1088
1089 /* The last transmission may have been successful */
1090 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1091 /* Collect data for each rate used during failed TX attempts */
1092 for (i = 0; i <= retries; ++i) {
5aa33553
ES		 1093 ucode_rate = le32_to_cpu(table->rs_table[i]);
1094 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5
JB		 1095 /*
1096 * Only collect stats if retried rate is in the same RS
1097 * table as active/search.
1098 */
5aa33553 1099 if (rs_rate_match(&rate, &curr_tbl->rate))
8ca151b5 1100 tmp_tbl = curr_tbl;
5aa33553 1101 else if (rs_rate_match(&rate, &other_tbl->rate))
8ca151b5 1102 tmp_tbl = other_tbl;
b3b06a32
ES		 1103 else {
1104 IWL_DEBUG_RATE(mvm,
1105 "Tx packet rate doesn't match ACTIVE or SEARCH tables\n");
1106 rs_dump_rate(mvm, &rate, "Tx PACKET:");
1107 rs_dump_rate(mvm, &curr_tbl->rate, "CURRENT:");
1108 rs_dump_rate(mvm, &other_tbl->rate, "OTHER:");
8ca151b5 1109 continue;
b3b06a32 1110 }
5aa33553 1111 rs_collect_tx_data(tmp_tbl, rate.index, 1,
8ca151b5
JB		 1112 i < retries ? 0 : legacy_success);
1113 }
1114
1115 /* Update success/fail counts if not searching for new mode */
b3b06a32 1116 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1117 lq_sta->total_success += legacy_success;
1118 lq_sta->total_failed += retries + (1 - legacy_success);
1119 }
1120 }
1121 /* The last TX rate is cached in lq_sta; it's set in if/else above */
5aa33553 1122 lq_sta->last_rate_n_flags = ucode_rate;
8ca151b5
JB		 1123done:
1124 /* See if there's a better rate or modulation mode to try. */
1125 if (sta && sta->supp_rates[sband->band])
1126 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1127}
1128
1129/*
1130 * Begin a period of staying with a selected modulation mode.
1131 * Set "stay_in_tbl" flag to prevent any mode switches.
1132 * Set frame tx success limits according to legacy vs. high-throughput,
1133 * and reset overall (spanning all rates) tx success history statistics.
1134 * These control how long we stay using same modulation mode before
1135 * searching for a new mode.
1136 */
1137static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1138 struct iwl_lq_sta *lq_sta)
1139{
b3b06a32
ES		 1140 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1141 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
8ca151b5
JB		 1142 if (is_legacy) {
1143 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1144 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1145 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1146 } else {
1147 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1148 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1149 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1150 }
1151 lq_sta->table_count = 0;
1152 lq_sta->total_failed = 0;
1153 lq_sta->total_success = 0;
1154 lq_sta->flush_timer = jiffies;
b3b06a32 1155 lq_sta->visited_columns = 0;
8ca151b5
JB		 1156}
1157
b3b06a32
ES		 1158static s32 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1159 const struct rs_tx_column *column,
1160 u32 bw)
8ca151b5
JB		 1161{
1162 /* Used to choose among HT tables */
1163 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1164
b3b06a32
ES		 1165 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1166 column->mode != RS_SISO &&
1167 column->mode != RS_MIMO2))
1168 return expected_tpt_legacy;
8ca151b5
JB		 1169
1170 /* Legacy rates have only one table */
b3b06a32
ES		 1171 if (column->mode == RS_LEGACY)
1172 return expected_tpt_legacy;
8ca151b5 1173
d310e405 1174 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
8ca151b5 1175 /* Choose among many HT tables depending on number of streams
d310e405 1176 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
8ca151b5 1177 * status */
b3b06a32
ES		 1178 if (column->mode == RS_SISO) {
1179 switch (bw) {
d310e405
ES		 1180 case RATE_MCS_CHAN_WIDTH_20:
1181 ht_tbl_pointer = expected_tpt_siso_20MHz;
1182 break;
1183 case RATE_MCS_CHAN_WIDTH_40:
1184 ht_tbl_pointer = expected_tpt_siso_40MHz;
1185 break;
1186 case RATE_MCS_CHAN_WIDTH_80:
1187 ht_tbl_pointer = expected_tpt_siso_80MHz;
1188 break;
1189 default:
1190 WARN_ON_ONCE(1);
1191 }
b3b06a32
ES		 1192 } else if (column->mode == RS_MIMO2) {
1193 switch (bw) {
d310e405
ES		 1194 case RATE_MCS_CHAN_WIDTH_20:
1195 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1196 break;
1197 case RATE_MCS_CHAN_WIDTH_40:
1198 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1199 break;
1200 case RATE_MCS_CHAN_WIDTH_80:
1201 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1202 break;
1203 default:
1204 WARN_ON_ONCE(1);
1205 }
1206 } else {
1207 WARN_ON_ONCE(1);
d972ab31 1208 }
8ca151b5 1209
b3b06a32
ES		 1210 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1211 return ht_tbl_pointer[0];
1212 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1213 return ht_tbl_pointer[1];
1214 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1215 return ht_tbl_pointer[2];
8ca151b5 1216 else /* AGG+SGI */
b3b06a32
ES		 1217 return ht_tbl_pointer[3];
1218}
1219
1220static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1221 struct iwl_scale_tbl_info *tbl)
1222{
1223 struct rs_rate *rate = &tbl->rate;
1224 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1225
1226 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
8ca151b5
JB		 1227}
1228
1229/*
1230 * Find starting rate for new "search" high-throughput mode of modulation.
1231 * Goal is to find lowest expected rate (under perfect conditions) that is
1232 * above the current measured throughput of "active" mode, to give new mode
1233 * a fair chance to prove itself without too many challenges.
1234 *
1235 * This gets called when transitioning to more aggressive modulation
1236 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1237 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1238 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1239 * bit rate will typically need to increase, but not if performance was bad.
1240 */
1241static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1242 struct iwl_lq_sta *lq_sta,
1243 struct iwl_scale_tbl_info *tbl, /* "search" */
1244 u16 rate_mask, s8 index)
1245{
1246 /* "active" values */
1247 struct iwl_scale_tbl_info *active_tbl =
1248 &(lq_sta->lq_info[lq_sta->active_tbl]);
1249 s32 active_sr = active_tbl->win[index].success_ratio;
1250 s32 active_tpt = active_tbl->expected_tpt[index];
1251
1252 /* expected "search" throughput */
1253 s32 *tpt_tbl = tbl->expected_tpt;
1254
1255 s32 new_rate, high, low, start_hi;
1256 u16 high_low;
1257 s8 rate = index;
1258
1259 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1260
1261 while (1) {
1262 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
5aa33553 1263 tbl->rate.type);
8ca151b5
JB		 1264
1265 low = high_low & 0xff;
1266 high = (high_low >> 8) & 0xff;
1267
1268 /*
1269 * Lower the "search" bit rate, to give new "search" mode
1270 * approximately the same throughput as "active" if:
1271 *
1272 * 1) "Active" mode has been working modestly well (but not
1273 * great), and expected "search" throughput (under perfect
1274 * conditions) at candidate rate is above the actual
1275 * measured "active" throughput (but less than expected
1276 * "active" throughput under perfect conditions).
1277 * OR
1278 * 2) "Active" mode has been working perfectly or very well
1279 * and expected "search" throughput (under perfect
1280 * conditions) at candidate rate is above expected
1281 * "active" throughput (under perfect conditions).
1282 */
1283 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
c48075d2 1284 ((active_sr > RS_SR_FORCE_DECREASE) &&
8ca151b5
JB		 1285 (active_sr <= IWL_RATE_HIGH_TH) &&
1286 (tpt_tbl[rate] <= active_tpt))) ||
1287 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1288 (tpt_tbl[rate] > active_tpt))) {
1289 /* (2nd or later pass)
1290 * If we've already tried to raise the rate, and are
1291 * now trying to lower it, use the higher rate. */
1292 if (start_hi != IWL_RATE_INVALID) {
1293 new_rate = start_hi;
1294 break;
1295 }
1296
1297 new_rate = rate;
1298
1299 /* Loop again with lower rate */
1300 if (low != IWL_RATE_INVALID)
1301 rate = low;
1302
1303 /* Lower rate not available, use the original */
1304 else
1305 break;
1306
1307 /* Else try to raise the "search" rate to match "active" */
1308 } else {
1309 /* (2nd or later pass)
1310 * If we've already tried to lower the rate, and are
1311 * now trying to raise it, use the lower rate. */
1312 if (new_rate != IWL_RATE_INVALID)
1313 break;
1314
1315 /* Loop again with higher rate */
1316 else if (high != IWL_RATE_INVALID) {
1317 start_hi = high;
1318 rate = high;
1319
1320 /* Higher rate not available, use the original */
1321 } else {
1322 new_rate = rate;
1323 break;
1324 }
1325 }
1326 }
1327
1328 return new_rate;
1329}
1330
5aa33553 1331static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
d310e405
ES		 1332{
1333 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
5aa33553 1334 return RATE_MCS_CHAN_WIDTH_80;
d310e405 1335 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
5aa33553
ES		 1336 return RATE_MCS_CHAN_WIDTH_40;
1337
1338 return RATE_MCS_CHAN_WIDTH_20;
d310e405
ES		 1339}
1340
8ca151b5
JB		 1341/*
1342 * Check whether we should continue using same modulation mode, or
1343 * begin search for a new mode, based on:
1344 * 1) # tx successes or failures while using this mode
1345 * 2) # times calling this function
1346 * 3) elapsed time in this mode (not used, for now)
1347 */
1348static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1349{
1350 struct iwl_scale_tbl_info *tbl;
1351 int i;
1352 int active_tbl;
1353 int flush_interval_passed = 0;
1354 struct iwl_mvm *mvm;
1355
1356 mvm = lq_sta->drv;
1357 active_tbl = lq_sta->active_tbl;
1358
1359 tbl = &(lq_sta->lq_info[active_tbl]);
1360
1361 /* If we've been disallowing search, see if we should now allow it */
b3b06a32 1362 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
8ca151b5
JB		 1363 /* Elapsed time using current modulation mode */
1364 if (lq_sta->flush_timer)
1365 flush_interval_passed =
1366 time_after(jiffies,
1367 (unsigned long)(lq_sta->flush_timer +
32b01726 1368 RS_STAY_IN_COLUMN_TIMEOUT));
8ca151b5
JB		 1369
1370 /*
1371 * Check if we should allow search for new modulation mode.
1372 * If many frames have failed or succeeded, or we've used
1373 * this same modulation for a long time, allow search, and
1374 * reset history stats that keep track of whether we should
1375 * allow a new search. Also (below) reset all bitmaps and
1376 * stats in active history.
1377 */
1378 if (force_search ||
1379 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1380 (lq_sta->total_success > lq_sta->max_success_limit) ||
1381 ((!lq_sta->search_better_tbl) &&
1382 (lq_sta->flush_timer) && (flush_interval_passed))) {
1383 IWL_DEBUG_RATE(mvm,
1384 "LQ: stay is expired %d %d %d\n",
1385 lq_sta->total_failed,
1386 lq_sta->total_success,
1387 flush_interval_passed);
1388
1389 /* Allow search for new mode */
b3b06a32
ES		 1390 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1391 IWL_DEBUG_RATE(mvm,
1392 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
8ca151b5
JB		 1393 lq_sta->total_failed = 0;
1394 lq_sta->total_success = 0;
1395 lq_sta->flush_timer = 0;
b3b06a32
ES		 1396 /* mark the current column as visited */
1397 lq_sta->visited_columns = BIT(tbl->column);
8ca151b5
JB		 1398 /*
1399 * Else if we've used this modulation mode enough repetitions
1400 * (regardless of elapsed time or success/failure), reset
1401 * history bitmaps and rate-specific stats for all rates in
1402 * active table.
1403 */
1404 } else {
1405 lq_sta->table_count++;
1406 if (lq_sta->table_count >=
1407 lq_sta->table_count_limit) {
1408 lq_sta->table_count = 0;
1409
1410 IWL_DEBUG_RATE(mvm,
1411 "LQ: stay in table clear win\n");
1412 for (i = 0; i < IWL_RATE_COUNT; i++)
1413 rs_rate_scale_clear_window(
1414 &(tbl->win[i]));
1415 }
1416 }
1417
1418 /* If transitioning to allow "search", reset all history
1419 * bitmaps and stats in active table (this will become the new
1420 * "search" table). */
b3b06a32
ES		 1421 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1422 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
8ca151b5
JB		 1423 for (i = 0; i < IWL_RATE_COUNT; i++)
1424 rs_rate_scale_clear_window(&(tbl->win[i]));
1425 }
1426 }
1427}
1428
1429/*
1430 * setup rate table in uCode
1431 */
1432static void rs_update_rate_tbl(struct iwl_mvm *mvm,
9145d151 1433 struct ieee80211_sta *sta,
8ca151b5 1434 struct iwl_lq_sta *lq_sta,
5aa33553 1435 struct rs_rate *rate)
8ca151b5 1436{
8fc7c58c 1437 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
9e680946 1438 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1439}
1440
977342bc
ES		 1441static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1442 struct ieee80211_hdr *hdr)
1443{
1444 u8 tid = IWL_MAX_TID_COUNT;
1445
1446 if (ieee80211_is_data_qos(hdr->frame_control)) {
1447 u8 *qc = ieee80211_get_qos_ctl(hdr);
1448 tid = qc[0] & 0xf;
1449 }
1450
1451 if (unlikely(tid > IWL_MAX_TID_COUNT))
1452 tid = IWL_MAX_TID_COUNT;
1453
1454 return tid;
1455}
1456
b3b06a32
ES		 1457static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1458 struct iwl_lq_sta *lq_sta,
1459 struct ieee80211_sta *sta,
1460 struct iwl_scale_tbl_info *tbl)
1461{
1462 int i, j, n;
1463 enum rs_column next_col_id;
1464 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1465 const struct rs_tx_column *next_col;
1466 allow_column_func_t allow_func;
1467 u8 valid_ants = iwl_fw_valid_tx_ant(mvm->fw);
1468 s32 *expected_tpt_tbl;
1469 s32 tpt, max_expected_tpt;
1470
1471 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1472 next_col_id = curr_col->next_columns[i];
1473
1474 if (next_col_id == RS_COLUMN_INVALID)
1475 continue;
1476
1477 if (lq_sta->visited_columns & BIT(next_col_id)) {
1478 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1479 next_col_id);
1480 continue;
1481 }
1482
1483 next_col = &rs_tx_columns[next_col_id];
1484
1485 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1486 IWL_DEBUG_RATE(mvm,
1487 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1488 next_col_id, valid_ants, next_col->ant);
1489 continue;
1490 }
1491
1492 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1493 allow_func = next_col->checks[j];
1494 if (allow_func && !allow_func(mvm, sta, tbl))
1495 break;
1496 }
1497
1498 if (j != MAX_COLUMN_CHECKS) {
1499 IWL_DEBUG_RATE(mvm,
1500 "Skip column %d: not allowed (check %d failed)\n",
1501 next_col_id, j);
1502
1503 continue;
1504 }
1505
1506 tpt = lq_sta->last_tpt / 100;
1507 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1508 tbl->rate.bw);
1509 if (WARN_ON_ONCE(!expected_tpt_tbl))
1510 continue;
1511
1512 max_expected_tpt = 0;
1513 for (n = 0; n < IWL_RATE_COUNT; n++)
1514 if (expected_tpt_tbl[n] > max_expected_tpt)
1515 max_expected_tpt = expected_tpt_tbl[n];
1516
1517 if (tpt >= max_expected_tpt) {
1518 IWL_DEBUG_RATE(mvm,
1519 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1520 next_col_id, max_expected_tpt, tpt);
1521 continue;
1522 }
1523
1524 break;
1525 }
1526
1527 if (i == MAX_NEXT_COLUMNS)
1528 return RS_COLUMN_INVALID;
1529
1530 IWL_DEBUG_RATE(mvm, "Found potential column %d\n", next_col_id);
1531
1532 return next_col_id;
1533}
1534
1535static int rs_switch_to_column(struct iwl_mvm *mvm,
1536 struct iwl_lq_sta *lq_sta,
1537 struct ieee80211_sta *sta,
1538 enum rs_column col_id)
1539{
1540 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1541 struct iwl_scale_tbl_info *search_tbl =
1542 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1543 struct rs_rate *rate = &search_tbl->rate;
1544 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1545 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1546 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1547 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1548 u16 rate_mask = 0;
1549 u32 rate_idx = 0;
1550
1551 memcpy(search_tbl, tbl, sz);
1552
1553 rate->sgi = column->sgi;
1554 rate->ant = column->ant;
1555
1556 if (column->mode == RS_LEGACY) {
1557 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1558 rate->type = LQ_LEGACY_A;
1559 else
1560 rate->type = LQ_LEGACY_G;
1561
1562 rate_mask = lq_sta->active_legacy_rate;
1563 } else if (column->mode == RS_SISO) {
1564 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1565 rate_mask = lq_sta->active_siso_rate;
1566 } else if (column->mode == RS_MIMO2) {
1567 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1568 rate_mask = lq_sta->active_mimo2_rate;
1569 } else {
1570 WARN_ON_ONCE("Bad column mode");
1571 }
1572
1573 rate->bw = rs_bw_from_sta_bw(sta);
1574 search_tbl->column = col_id;
1575 rs_set_expected_tpt_table(lq_sta, search_tbl);
1576
1577 /* Get the best matching rate if we're changing modes. e.g.
1578 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1579 */
1580 if (curr_column->mode != column->mode) {
1581 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1582 rate_mask, rate->index);
1583
1584 if ((rate_idx == IWL_RATE_INVALID) ||
1585 !(BIT(rate_idx) & rate_mask)) {
1586 IWL_DEBUG_RATE(mvm,
1587 "can not switch with index %d"
1588 " rate mask %x\n",
1589 rate_idx, rate_mask);
1590
1591 goto err;
1592 }
1593
1594 rate->index = rate_idx;
1595 }
1596
b3b06a32
ES		 1597 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1598 col_id, rate->index);
1599
1600 lq_sta->visited_columns |= BIT(col_id);
1601 return 0;
1602
1603err:
1604 rate->type = LQ_NONE;
1605 return -1;
1606}
1607
1608
8ca151b5
JB		 1609/*
1610 * Do rate scaling and search for new modulation mode.
1611 */
1612static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1613 struct sk_buff *skb,
1614 struct ieee80211_sta *sta,
1615 struct iwl_lq_sta *lq_sta)
1616{
1617 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1618 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1619 int low = IWL_RATE_INVALID;
1620 int high = IWL_RATE_INVALID;
1621 int index;
1622 int i;
1623 struct iwl_rate_scale_data *window = NULL;
1624 int current_tpt = IWL_INVALID_VALUE;
1625 int low_tpt = IWL_INVALID_VALUE;
1626 int high_tpt = IWL_INVALID_VALUE;
1627 u32 fail_count;
1628 s8 scale_action = 0;
1629 u16 rate_mask;
1630 u8 update_lq = 0;
1631 struct iwl_scale_tbl_info *tbl, *tbl1;
1632 u16 rate_scale_index_msk = 0;
8ca151b5
JB		 1633 u8 active_tbl = 0;
1634 u8 done_search = 0;
1635 u16 high_low;
1636 s32 sr;
1637 u8 tid = IWL_MAX_TID_COUNT;
9d015a03 1638 u8 prev_agg = lq_sta->is_agg;
8ca151b5
JB		 1639 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1640 struct iwl_mvm_tid_data *tid_data;
5aa33553 1641 struct rs_rate *rate;
8ca151b5 1642
8ca151b5
JB		 1643 /* Send management frames and NO_ACK data using lowest rate. */
1644 /* TODO: this could probably be improved.. */
1645 if (!ieee80211_is_data(hdr->frame_control) ||
1646 info->flags & IEEE80211_TX_CTL_NO_ACK)
1647 return;
1648
1649 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1650
977342bc 1651 tid = rs_get_tid(lq_sta, hdr);
8ca151b5
JB		 1652 if ((tid != IWL_MAX_TID_COUNT) &&
1653 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1654 tid_data = &sta_priv->tid_data[tid];
1655 if (tid_data->state == IWL_AGG_OFF)
1656 lq_sta->is_agg = 0;
1657 else
1658 lq_sta->is_agg = 1;
1659 } else {
1660 lq_sta->is_agg = 0;
1661 }
1662
1663 /*
1664 * Select rate-scale / modulation-mode table to work with in
1665 * the rest of this function: "search" if searching for better
1666 * modulation mode, or "active" if doing rate scaling within a mode.
1667 */
1668 if (!lq_sta->search_better_tbl)
1669 active_tbl = lq_sta->active_tbl;
1670 else
1671 active_tbl = 1 - lq_sta->active_tbl;
1672
1673 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 1674 rate = &tbl->rate;
8ca151b5 1675
9d015a03
ES		 1676 if (prev_agg != lq_sta->is_agg) {
1677 IWL_DEBUG_RATE(mvm,
1678 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
1679 prev_agg, lq_sta->is_agg);
1680 rs_set_expected_tpt_table(lq_sta, tbl);
1681 }
1682
8ca151b5
JB		 1683 /* current tx rate */
1684 index = lq_sta->last_txrate_idx;
1685
8ca151b5 1686 /* rates available for this association, and for modulation mode */
a8ff14f5 1687 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5 1688
8ca151b5 1689 /* mask with station rate restriction */
5aa33553 1690 if (is_legacy(rate)) {
8ca151b5
JB		 1691 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1692 /* supp_rates has no CCK bits in A mode */
1693 rate_scale_index_msk = (u16) (rate_mask &
1694 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1695 else
1696 rate_scale_index_msk = (u16) (rate_mask &
1697 lq_sta->supp_rates);
1698
1699 } else {
1700 rate_scale_index_msk = rate_mask;
1701 }
1702
1703 if (!rate_scale_index_msk)
1704 rate_scale_index_msk = rate_mask;
1705
b3b06a32 1706 if (!((BIT(index) & rate_scale_index_msk))) {
8ca151b5
JB		 1707 IWL_ERR(mvm, "Current Rate is not valid\n");
1708 if (lq_sta->search_better_tbl) {
1709 /* revert to active table if search table is not valid*/
5aa33553 1710 rate->type = LQ_NONE;
8ca151b5
JB		 1711 lq_sta->search_better_tbl = 0;
1712 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 1713 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
8ca151b5
JB		 1714 }
1715 return;
1716 }
1717
1718 /* Get expected throughput table and history window for current rate */
1719 if (!tbl->expected_tpt) {
1720 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1721 return;
1722 }
1723
1724 /* force user max rate if set by user */
1725 if ((lq_sta->max_rate_idx != -1) &&
1726 (lq_sta->max_rate_idx < index)) {
1727 index = lq_sta->max_rate_idx;
1728 update_lq = 1;
1729 window = &(tbl->win[index]);
4d30ee82
ES		 1730 IWL_DEBUG_RATE(mvm,
1731 "Forcing user max rate %d\n",
1732 index);
8ca151b5
JB		 1733 goto lq_update;
1734 }
1735
1736 window = &(tbl->win[index]);
1737
1738 /*
1739 * If there is not enough history to calculate actual average
1740 * throughput, keep analyzing results of more tx frames, without
1741 * changing rate or mode (bypass most of the rest of this function).
1742 * Set up new rate table in uCode only if old rate is not supported
1743 * in current association (use new rate found above).
1744 */
1745 fail_count = window->counter - window->success_counter;
1746 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1747 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1748 IWL_DEBUG_RATE(mvm,
4d30ee82 1749 "(%s: %d): Test Window: succ %d total %d\n",
5aa33553 1750 rs_pretty_lq_type(rate->type),
4d30ee82 1751 index, window->success_counter, window->counter);
8ca151b5
JB		 1752
1753 /* Can't calculate this yet; not enough history */
1754 window->average_tpt = IWL_INVALID_VALUE;
1755
1756 /* Should we stay with this modulation mode,
1757 * or search for a new one? */
1758 rs_stay_in_table(lq_sta, false);
1759
1760 goto out;
1761 }
1762 /* Else we have enough samples; calculate estimate of
1763 * actual average throughput */
1764 if (window->average_tpt != ((window->success_ratio *
1765 tbl->expected_tpt[index] + 64) / 128)) {
8ca151b5
JB		 1766 window->average_tpt = ((window->success_ratio *
1767 tbl->expected_tpt[index] + 64) / 128);
1768 }
1769
1770 /* If we are searching for better modulation mode, check success. */
1771 if (lq_sta->search_better_tbl) {
1772 /* If good success, continue using the "search" mode;
1773 * no need to send new link quality command, since we're
1774 * continuing to use the setup that we've been trying. */
1775 if (window->average_tpt > lq_sta->last_tpt) {
1776 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1777 "SWITCHING TO NEW TABLE SR: %d "
1778 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 1779 window->success_ratio,
1780 window->average_tpt,
1781 lq_sta->last_tpt);
1782
8ca151b5
JB		 1783 /* Swap tables; "search" becomes "active" */
1784 lq_sta->active_tbl = active_tbl;
1785 current_tpt = window->average_tpt;
1786 /* Else poor success; go back to mode in "active" table */
1787 } else {
1788 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1789 "GOING BACK TO THE OLD TABLE: SR %d "
1790 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 1791 window->success_ratio,
1792 window->average_tpt,
1793 lq_sta->last_tpt);
1794
1795 /* Nullify "search" table */
5aa33553 1796 rate->type = LQ_NONE;
8ca151b5
JB		 1797
1798 /* Revert to "active" table */
1799 active_tbl = lq_sta->active_tbl;
1800 tbl = &(lq_sta->lq_info[active_tbl]);
1801
1802 /* Revert to "active" rate and throughput info */
8fc7c58c 1803 index = tbl->rate.index;
8ca151b5
JB		 1804 current_tpt = lq_sta->last_tpt;
1805
1806 /* Need to set up a new rate table in uCode */
1807 update_lq = 1;
1808 }
1809
1810 /* Either way, we've made a decision; modulation mode
1811 * search is done, allow rate adjustment next time. */
1812 lq_sta->search_better_tbl = 0;
1813 done_search = 1; /* Don't switch modes below! */
1814 goto lq_update;
1815 }
1816
1817 /* (Else) not in search of better modulation mode, try for better
1818 * starting rate, while staying in this mode. */
1819 high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
5aa33553 1820 rate->type);
8ca151b5
JB		 1821 low = high_low & 0xff;
1822 high = (high_low >> 8) & 0xff;
1823
1824 /* If user set max rate, dont allow higher than user constrain */
1825 if ((lq_sta->max_rate_idx != -1) &&
1826 (lq_sta->max_rate_idx < high))
1827 high = IWL_RATE_INVALID;
1828
1829 sr = window->success_ratio;
1830
1831 /* Collect measured throughputs for current and adjacent rates */
1832 current_tpt = window->average_tpt;
1833 if (low != IWL_RATE_INVALID)
1834 low_tpt = tbl->win[low].average_tpt;
1835 if (high != IWL_RATE_INVALID)
1836 high_tpt = tbl->win[high].average_tpt;
1837
4d30ee82
ES		 1838 IWL_DEBUG_RATE(mvm,
1839 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
5aa33553
ES		 1840 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
1841 low, high, low_tpt, high_tpt);
4d30ee82 1842
8ca151b5
JB		 1843 scale_action = 0;
1844
1845 /* Too many failures, decrease rate */
c48075d2 1846 if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
8ca151b5 1847 IWL_DEBUG_RATE(mvm,
4d30ee82 1848 "decrease rate because of low SR\n");
8ca151b5
JB		 1849 scale_action = -1;
1850 /* No throughput measured yet for adjacent rates; try increase. */
1851 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1852 (high_tpt == IWL_INVALID_VALUE)) {
4d30ee82
ES		 1853 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) {
1854 IWL_DEBUG_RATE(mvm,
1855 "Good SR and no high rate measurement. "
1856 "Increase rate\n");
8ca151b5 1857 scale_action = 1;
4d30ee82
ES		 1858 } else if (low != IWL_RATE_INVALID) {
1859 IWL_DEBUG_RATE(mvm,
1860 "Remain in current rate\n");
8ca151b5 1861 scale_action = 0;
4d30ee82 1862 }
8ca151b5
JB		 1863 }
1864
1865 /* Both adjacent throughputs are measured, but neither one has better
1866 * throughput; we're using the best rate, don't change it! */
1867 else if ((low_tpt != IWL_INVALID_VALUE) &&
1868 (high_tpt != IWL_INVALID_VALUE) &&
1869 (low_tpt < current_tpt) &&
4d30ee82
ES		 1870 (high_tpt < current_tpt)) {
1871 IWL_DEBUG_RATE(mvm,
1872 "Both high and low are worse. "
1873 "Maintain rate\n");
8ca151b5 1874 scale_action = 0;
4d30ee82 1875 }
8ca151b5
JB		 1876
1877 /* At least one adjacent rate's throughput is measured,
1878 * and may have better performance. */
1879 else {
1880 /* Higher adjacent rate's throughput is measured */
1881 if (high_tpt != IWL_INVALID_VALUE) {
1882 /* Higher rate has better throughput */
1883 if (high_tpt > current_tpt &&
1884 sr >= IWL_RATE_INCREASE_TH) {
4d30ee82
ES		 1885 IWL_DEBUG_RATE(mvm,
1886 "Higher rate is better and good "
1887 "SR. Increate rate\n");
8ca151b5
JB		 1888 scale_action = 1;
1889 } else {
4d30ee82
ES		 1890 IWL_DEBUG_RATE(mvm,
1891 "Higher rate isn't better OR "
1892 "no good SR. Maintain rate\n");
8ca151b5
JB		 1893 scale_action = 0;
1894 }
1895
1896 /* Lower adjacent rate's throughput is measured */
1897 } else if (low_tpt != IWL_INVALID_VALUE) {
1898 /* Lower rate has better throughput */
1899 if (low_tpt > current_tpt) {
1900 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1901 "Lower rate is better. "
1902 "Decrease rate\n");
8ca151b5
JB		 1903 scale_action = -1;
1904 } else if (sr >= IWL_RATE_INCREASE_TH) {
4d30ee82
ES		 1905 IWL_DEBUG_RATE(mvm,
1906 "Lower rate isn't better and "
1907 "good SR. Increase rate\n");
8ca151b5
JB		 1908 scale_action = 1;
1909 }
1910 }
1911 }
1912
1913 /* Sanity check; asked for decrease, but success rate or throughput
1914 * has been good at old rate. Don't change it. */
1915 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1916 ((sr > IWL_RATE_HIGH_TH) ||
4d30ee82
ES		 1917 (current_tpt > (100 * tbl->expected_tpt[low])))) {
1918 IWL_DEBUG_RATE(mvm,
1919 "Sanity check failed. Maintain rate\n");
8ca151b5 1920 scale_action = 0;
4d30ee82 1921 }
8ca151b5 1922
393b9e5b 1923 /* Force a search in case BT doesn't like us being in MIMO */
5aa33553 1924 if (is_mimo(rate) &&
393b9e5b 1925 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
4d30ee82
ES		 1926 IWL_DEBUG_RATE(mvm,
1927 "BT Coex forbids MIMO. Search for new config\n");
36946ce6
EG		 1928 rs_stay_in_table(lq_sta, true);
1929 goto lq_update;
1930 }
1931
8ca151b5
JB		 1932 switch (scale_action) {
1933 case -1:
1934 /* Decrease starting rate, update uCode's rate table */
1935 if (low != IWL_RATE_INVALID) {
1936 update_lq = 1;
1937 index = low;
4d30ee82
ES		 1938 } else {
1939 IWL_DEBUG_RATE(mvm,
1940 "At the bottom rate. Can't decrease\n");
8ca151b5
JB		 1941 }
1942
1943 break;
1944 case 1:
1945 /* Increase starting rate, update uCode's rate table */
1946 if (high != IWL_RATE_INVALID) {
1947 update_lq = 1;
1948 index = high;
4d30ee82
ES		 1949 } else {
1950 IWL_DEBUG_RATE(mvm,
1951 "At the top rate. Can't increase\n");
8ca151b5
JB		 1952 }
1953
1954 break;
1955 case 0:
1956 /* No change */
1957 default:
1958 break;
1959 }
1960
8ca151b5
JB		 1961lq_update:
1962 /* Replace uCode's rate table for the destination station. */
5aa33553
ES		 1963 if (update_lq) {
1964 tbl->rate.index = index;
1965 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
1966 }
8ca151b5
JB		 1967
1968 rs_stay_in_table(lq_sta, false);
1969
1970 /*
1971 * Search for new modulation mode if we're:
1972 * 1) Not changing rates right now
1973 * 2) Not just finishing up a search
1974 * 3) Allowing a new search
1975 */
1976 if (!update_lq && !done_search &&
b3b06a32
ES		 1977 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
1978 && window->counter) {
1979 enum rs_column next_column;
1980
8ca151b5
JB		 1981 /* Save current throughput to compare with "search" throughput*/
1982 lq_sta->last_tpt = current_tpt;
1983
4d30ee82 1984 IWL_DEBUG_RATE(mvm,
b3b06a32
ES		 1985 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
1986 update_lq, done_search, lq_sta->rs_state,
4d30ee82 1987 window->counter);
b3b06a32
ES		 1988
1989 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
1990 if (next_column != RS_COLUMN_INVALID) {
1991 int ret = rs_switch_to_column(mvm, lq_sta, sta,
1992 next_column);
1993 if (!ret)
1994 lq_sta->search_better_tbl = 1;
1995 } else {
1996 IWL_DEBUG_RATE(mvm,
1997 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
1998 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
1999 }
8ca151b5
JB		 2000
2001 /* If new "search" mode was selected, set up in uCode table */
2002 if (lq_sta->search_better_tbl) {
2003 /* Access the "search" table, clear its history. */
2004 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2005 for (i = 0; i < IWL_RATE_COUNT; i++)
2006 rs_rate_scale_clear_window(&(tbl->win[i]));
2007
2008 /* Use new "search" start rate */
8fc7c58c 2009 index = tbl->rate.index;
8ca151b5 2010
b3b06a32
ES		 2011 rs_dump_rate(mvm, &tbl->rate,
2012 "Switch to SEARCH TABLE:");
8fc7c58c 2013 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
9e680946 2014 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 2015 } else {
2016 done_search = 1;
2017 }
2018 }
2019
b3b06a32 2020 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
8ca151b5
JB		 2021 /* If the "active" (non-search) mode was legacy,
2022 * and we've tried switching antennas,
2023 * but we haven't been able to try HT modes (not available),
2024 * stay with best antenna legacy modulation for a while
2025 * before next round of mode comparisons. */
2026 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
b3b06a32 2027 if (is_legacy(&tbl1->rate) && !sta->ht_cap.ht_supported) {
8ca151b5
JB		 2028 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2029 rs_set_stay_in_table(mvm, 1, lq_sta);
b3b06a32 2030 } else {
8ca151b5
JB		 2031 /* If we're in an HT mode, and all 3 mode switch actions
2032 * have been tried and compared, stay in this best modulation
2033 * mode for a while before next round of mode comparisons. */
8ca151b5
JB		 2034 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2035 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2036 (tid != IWL_MAX_TID_COUNT)) {
2037 tid_data = &sta_priv->tid_data[tid];
2038 if (tid_data->state == IWL_AGG_OFF) {
2039 IWL_DEBUG_RATE(mvm,
2040 "try to aggregate tid %d\n",
2041 tid);
2042 rs_tl_turn_on_agg(mvm, tid,
2043 lq_sta, sta);
2044 }
2045 }
2046 rs_set_stay_in_table(mvm, 0, lq_sta);
2047 }
2048 }
2049
2050out:
8ca151b5
JB		 2051 lq_sta->last_txrate_idx = index;
2052}
2053
2054/**
2055 * rs_initialize_lq - Initialize a station's hardware rate table
2056 *
2057 * The uCode's station table contains a table of fallback rates
2058 * for automatic fallback during transmission.
2059 *
2060 * NOTE: This sets up a default set of values. These will be replaced later
2061 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2062 * rc80211_simple.
2063 *
2064 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2065 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2066 * which requires station table entry to exist).
2067 */
2068static void rs_initialize_lq(struct iwl_mvm *mvm,
2069 struct ieee80211_sta *sta,
2070 struct iwl_lq_sta *lq_sta,
b87c2179
ES		 2071 enum ieee80211_band band,
2072 bool init)
8ca151b5
JB		 2073{
2074 struct iwl_scale_tbl_info *tbl;
5aa33553 2075 struct rs_rate *rate;
8ca151b5 2076 int i;
8ca151b5
JB		 2077 u8 active_tbl = 0;
2078 u8 valid_tx_ant;
2079
2080 if (!sta || !lq_sta)
2081 return;
2082
2083 i = lq_sta->last_txrate_idx;
2084
ff402312 2085 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2086
2087 if (!lq_sta->search_better_tbl)
2088 active_tbl = lq_sta->active_tbl;
2089 else
2090 active_tbl = 1 - lq_sta->active_tbl;
2091
2092 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2093 rate = &tbl->rate;
8ca151b5
JB		 2094
2095 if ((i < 0) || (i >= IWL_RATE_COUNT))
2096 i = 0;
2097
b3b06a32 2098 rate->index = i;
5aa33553 2099 rate->ant = first_antenna(valid_tx_ant);
b3b06a32
ES		 2100 rate->sgi = false;
2101 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2102 if (band == IEEE80211_BAND_5GHZ)
2103 rate->type = LQ_LEGACY_A;
2104 else
2105 rate->type = LQ_LEGACY_G;
8ca151b5 2106
b3b06a32
ES		 2107 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2108 if (rate->ant == ANT_A)
2109 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2110 else
2111 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2112
8ca151b5 2113 rs_set_expected_tpt_table(lq_sta, tbl);
8fc7c58c 2114 rs_fill_lq_cmd(NULL, NULL, lq_sta, rate);
8ca151b5 2115 /* TODO restore station should remember the lq cmd */
b87c2179 2116 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
8ca151b5
JB		 2117}
2118
2119static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2120 struct ieee80211_tx_rate_control *txrc)
2121{
2122 struct sk_buff *skb = txrc->skb;
2123 struct ieee80211_supported_band *sband = txrc->sband;
2124 struct iwl_op_mode *op_mode __maybe_unused =
2125 (struct iwl_op_mode *)mvm_r;
2126 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2127 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2128 struct iwl_lq_sta *lq_sta = mvm_sta;
8ca151b5 2129
8ca151b5
JB		 2130 /* Get max rate if user set max rate */
2131 if (lq_sta) {
2132 lq_sta->max_rate_idx = txrc->max_rate_idx;
2133 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2134 (lq_sta->max_rate_idx != -1))
2135 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2136 if ((lq_sta->max_rate_idx < 0) ||
2137 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2138 lq_sta->max_rate_idx = -1;
2139 }
2140
2141 /* Treat uninitialized rate scaling data same as non-existing. */
2142 if (lq_sta && !lq_sta->drv) {
2143 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2144 mvm_sta = NULL;
2145 }
2146
2147 /* Send management frames and NO_ACK data using lowest rate. */
2148 if (rate_control_send_low(sta, mvm_sta, txrc))
2149 return;
2150
d310e405
ES		 2151 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2152 info->band, &info->control.rates[0]);
2153
622ebe99 2154 info->control.rates[0].count = 1;
8ca151b5
JB		 2155}
2156
2157static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2158 gfp_t gfp)
2159{
2160 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2161 struct iwl_op_mode *op_mode __maybe_unused =
2162 (struct iwl_op_mode *)mvm_rate;
2163 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2164
2165 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2166
2167 return &sta_priv->lq_sta;
2168}
2169
d310e405
ES		 2170static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2171 int nss)
2172{
2173 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2174 (0x3 << (2 * (nss - 1)));
2175 rx_mcs >>= (2 * (nss - 1));
2176
2177 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2178 return IWL_RATE_MCS_7_INDEX;
2179 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2180 return IWL_RATE_MCS_8_INDEX;
2181 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2182 return IWL_RATE_MCS_9_INDEX;
2183
2184 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2185 return -1;
2186}
2187
750a1b45
ES		 2188static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2189 struct ieee80211_sta_vht_cap *vht_cap,
2190 struct iwl_lq_sta *lq_sta)
2191{
2192 int i;
2193 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2194
2195 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2196 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2197 if (i == IWL_RATE_9M_INDEX)
2198 continue;
2199
271518ad
ES		 2200 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2201 if (i == IWL_RATE_MCS_9_INDEX &&
2202 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2203 continue;
2204
750a1b45
ES		 2205 lq_sta->active_siso_rate |= BIT(i);
2206 }
2207 }
2208
ecc90e79
ES		 2209 if (sta->rx_nss < 2)
2210 return;
2211
750a1b45
ES		 2212 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2213 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2214 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2215 if (i == IWL_RATE_9M_INDEX)
2216 continue;
2217
271518ad
ES		 2218 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2219 if (i == IWL_RATE_MCS_9_INDEX &&
2220 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2221 continue;
2222
750a1b45
ES		 2223 lq_sta->active_mimo2_rate |= BIT(i);
2224 }
2225 }
2226}
2227
8ca151b5
JB		 2228/*
2229 * Called after adding a new station to initialize rate scaling
2230 */
2231void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
b87c2179 2232 enum ieee80211_band band, bool init)
8ca151b5
JB		 2233{
2234 int i, j;
2235 struct ieee80211_hw *hw = mvm->hw;
2236 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
d310e405 2237 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
8ca151b5
JB		 2238 struct iwl_mvm_sta *sta_priv;
2239 struct iwl_lq_sta *lq_sta;
2240 struct ieee80211_supported_band *sband;
2241 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2242
2243 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2244 lq_sta = &sta_priv->lq_sta;
b87c2179
ES		 2245 memset(lq_sta, 0, sizeof(*lq_sta));
2246
8ca151b5
JB		 2247 sband = hw->wiphy->bands[band];
2248
2249 lq_sta->lq.sta_id = sta_priv->sta_id;
2250
2251 for (j = 0; j < LQ_SIZE; j++)
2252 for (i = 0; i < IWL_RATE_COUNT; i++)
2253 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2254
2255 lq_sta->flush_timer = 0;
2256 lq_sta->supp_rates = sta->supp_rates[sband->band];
8ca151b5
JB		 2257
2258 IWL_DEBUG_RATE(mvm,
2259 "LQ: *** rate scale station global init for station %d ***\n",
2260 sta_priv->sta_id);
2261 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2262 * the lowest or the highest rate.. Could consider using RSSI from
2263 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2264 * after assoc.. */
2265
2266 lq_sta->max_rate_idx = -1;
2267 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
8ca151b5
JB		 2268 lq_sta->band = sband->band;
2269 /*
2270 * active legacy rates as per supported rates bitmap
2271 */
2272 supp = sta->supp_rates[sband->band];
2273 lq_sta->active_legacy_rate = 0;
2274 for_each_set_bit(i, &supp, BITS_PER_LONG)
2275 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2276
d310e405
ES		 2277 /* TODO: should probably account for rx_highest for both HT/VHT */
2278 if (!vht_cap || !vht_cap->vht_supported) {
2279 /* active_siso_rate mask includes 9 MBits (bit 5),
2280 * and CCK (bits 0-3), supp_rates[] does not;
2281 * shift to convert format, force 9 MBits off.
2282 */
2283 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2284 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2285 lq_sta->active_siso_rate &= ~((u16)0x2);
2286 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2287
2288 /* Same here */
2289 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2290 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2291 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2292 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2293
2294 lq_sta->is_vht = false;
2295 } else {
750a1b45 2296 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
d310e405
ES		 2297 lq_sta->is_vht = true;
2298 }
8ca151b5 2299
8ca151b5 2300 IWL_DEBUG_RATE(mvm,
d310e405 2301 "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
8ca151b5 2302 lq_sta->active_siso_rate,
d310e405
ES		 2303 lq_sta->active_mimo2_rate,
2304 lq_sta->is_vht);
8ca151b5
JB		 2305
2306 /* These values will be overridden later */
2307 lq_sta->lq.single_stream_ant_msk =
ff402312 2308 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
809bccfa 2309 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
8ca151b5
JB		 2310
2311 /* as default allow aggregation for all tids */
2312 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2313 lq_sta->drv = mvm;
2314
2315 /* Set last_txrate_idx to lowest rate */
2316 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2317 if (sband->band == IEEE80211_BAND_5GHZ)
2318 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2319 lq_sta->is_agg = 0;
2320#ifdef CONFIG_MAC80211_DEBUGFS
2321 lq_sta->dbg_fixed_rate = 0;
2322#endif
2323
b87c2179
ES		 2324 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2325}
2326
2327static void rs_rate_update(void *mvm_r,
2328 struct ieee80211_supported_band *sband,
2329 struct cfg80211_chan_def *chandef,
2330 struct ieee80211_sta *sta, void *priv_sta,
2331 u32 changed)
2332{
2333 u8 tid;
2334 struct iwl_op_mode *op_mode =
2335 (struct iwl_op_mode *)mvm_r;
2336 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2337
2338 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2339 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2340 ieee80211_stop_tx_ba_session(sta, tid);
2341
2342 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
8ca151b5
JB		 2343}
2344
8fc7c58c
ES		 2345#ifdef CONFIG_MAC80211_DEBUGFS
2346static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2347 struct iwl_lq_cmd *lq_cmd,
2348 enum ieee80211_band band,
2349 u32 ucode_rate)
2350{
2351 struct rs_rate rate;
2352 int i;
2353 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2354 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2355
2356 for (i = 0; i < num_rates; i++)
2357 lq_cmd->rs_table[i] = ucode_rate_le32;
2358
2359 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2360
2361 if (is_mimo(&rate))
2362 lq_cmd->mimo_delim = num_rates - 1;
2363 else
2364 lq_cmd->mimo_delim = 0;
2365}
2366#endif /* CONFIG_MAC80211_DEBUGFS */
2367
2368static void rs_build_rates_table(struct iwl_mvm *mvm,
2369 struct iwl_lq_sta *lq_sta,
2370 const struct rs_rate *initial_rate)
8ca151b5 2371{
5aa33553 2372 struct rs_rate rate;
8ca151b5 2373 int index = 0;
8ca151b5
JB		 2374 int repeat_rate = 0;
2375 u8 ant_toggle_cnt = 0;
2376 u8 use_ht_possible = 1;
2377 u8 valid_tx_ant = 0;
2378 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2379
8fc7c58c
ES		 2380 memcpy(&rate, initial_rate, sizeof(struct rs_rate));
2381
2382 lq_cmd->mimo_delim = is_mimo(&rate) ? 1 : 0;
8ca151b5 2383
8fc7c58c
ES		 2384 /* Fill 1st table entry (index 0) */
2385 lq_cmd->rs_table[index] = cpu_to_le32(
2386 ucode_rate_from_rs_rate(mvm, &rate));
8ca151b5
JB		 2387
2388 /* How many times should we repeat the initial rate? */
5aa33553 2389 if (is_legacy(&rate)) {
8ca151b5
JB		 2390 ant_toggle_cnt = 1;
2391 repeat_rate = IWL_NUMBER_TRY;
2392 } else {
2393 repeat_rate = min(IWL_HT_NUMBER_TRY,
2394 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2395 }
2396
8ca151b5
JB		 2397 index++;
2398 repeat_rate--;
2399 if (mvm)
ff402312 2400 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2401
2402 /* Fill rest of rate table */
2403 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2404 /* Repeat initial/next rate.
2405 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2406 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2407 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
5aa33553 2408 if (is_legacy(&rate)) {
8ca151b5
JB		 2409 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2410 ant_toggle_cnt++;
2411 else if (mvm &&
8fc7c58c 2412 rs_toggle_antenna(valid_tx_ant, &rate))
8ca151b5
JB		 2413 ant_toggle_cnt = 1;
2414 }
2415
8ca151b5 2416 /* Fill next table entry */
8fc7c58c
ES		 2417 lq_cmd->rs_table[index] = cpu_to_le32(
2418 ucode_rate_from_rs_rate(mvm, &rate));
8ca151b5
JB		 2419 repeat_rate--;
2420 index++;
2421 }
2422
8ca151b5
JB		 2423 /* Indicate to uCode which entries might be MIMO.
2424 * If initial rate was MIMO, this will finally end up
2425 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
5aa33553 2426 if (is_mimo(&rate))
8ca151b5
JB		 2427 lq_cmd->mimo_delim = index;
2428
2429 /* Get next rate */
8fc7c58c 2430 rs_get_lower_rate(lq_sta, &rate, rate.index, use_ht_possible);
8ca151b5
JB		 2431
2432 /* How many times should we repeat the next rate? */
5aa33553 2433 if (is_legacy(&rate)) {
8ca151b5
JB		 2434 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2435 ant_toggle_cnt++;
2436 else if (mvm &&
8fc7c58c 2437 rs_toggle_antenna(valid_tx_ant, &rate))
8ca151b5
JB		 2438 ant_toggle_cnt = 1;
2439
2440 repeat_rate = IWL_NUMBER_TRY;
2441 } else {
2442 repeat_rate = IWL_HT_NUMBER_TRY;
2443 }
2444
2445 /* Don't allow HT rates after next pass.
d310e405
ES		 2446 * rs_get_lower_rate() will change type to LQ_LEGACY_A
2447 * or LQ_LEGACY_G.
2448 */
8ca151b5
JB		 2449 use_ht_possible = 0;
2450
8ca151b5 2451 /* Fill next table entry */
8fc7c58c
ES		 2452 lq_cmd->rs_table[index] = cpu_to_le32(
2453 ucode_rate_from_rs_rate(mvm, &rate));
8ca151b5
JB		 2454
2455 index++;
2456 repeat_rate--;
2457 }
8fc7c58c
ES		 2458}
2459
2460static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2461 struct ieee80211_sta *sta,
2462 struct iwl_lq_sta *lq_sta,
2463 const struct rs_rate *initial_rate)
2464{
2465 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2466 u8 ant = initial_rate->ant;
2467
2468#ifdef CONFIG_MAC80211_DEBUGFS
2469 if (lq_sta->dbg_fixed_rate) {
2470 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2471 lq_sta->band,
2472 lq_sta->dbg_fixed_rate);
2473 ant = (lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2474 RATE_MCS_ANT_POS;
2475 } else
2476#endif
2477 rs_build_rates_table(mvm, lq_sta, initial_rate);
2478
2479 if (num_of_ant(ant) == 1)
2480 lq_cmd->single_stream_ant_msk = ant;
8ca151b5
JB		 2481
2482 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2483 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2484
2485 lq_cmd->agg_time_limit =
2486 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
e96d551f 2487
9145d151
EG		 2488 if (sta)
2489 lq_cmd->agg_time_limit =
2490 cpu_to_le16(iwl_mvm_bt_coex_agg_time_limit(mvm, sta));
8ca151b5
JB		 2491}
2492
2493static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2494{
2495 return hw->priv;
2496}
2497/* rate scale requires free function to be implemented */
2498static void rs_free(void *mvm_rate)
2499{
2500 return;
2501}
2502
2503static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2504 void *mvm_sta)
2505{
2506 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2507 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2508
2509 IWL_DEBUG_RATE(mvm, "enter\n");
2510 IWL_DEBUG_RATE(mvm, "leave\n");
2511}
2512
2513#ifdef CONFIG_MAC80211_DEBUGFS
5aa33553
ES		 2514static int rs_pretty_print_rate(char *buf, const u32 rate)
2515{
2516
1a61b347
ES		 2517 char *type, *bw;
2518 u8 mcs = 0, nss = 0;
2519 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2520
2521 if (!(rate & RATE_MCS_HT_MSK) &&
2522 !(rate & RATE_MCS_VHT_MSK)) {
2523 int index = iwl_hwrate_to_plcp_idx(rate);
2524
2525 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
5aa33553 2526 rs_pretty_ant(ant), iwl_rate_mcs[index].mbps);
1a61b347
ES		 2527 }
2528
2529 if (rate & RATE_MCS_VHT_MSK) {
2530 type = "VHT";
2531 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2532 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2533 >> RATE_VHT_MCS_NSS_POS) + 1;
2534 } else if (rate & RATE_MCS_HT_MSK) {
2535 type = "HT";
2536 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2537 } else {
2538 type = "Unknown"; /* shouldn't happen */
2539 }
2540
2541 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2542 case RATE_MCS_CHAN_WIDTH_20:
2543 bw = "20Mhz";
2544 break;
2545 case RATE_MCS_CHAN_WIDTH_40:
2546 bw = "40Mhz";
2547 break;
2548 case RATE_MCS_CHAN_WIDTH_80:
2549 bw = "80Mhz";
2550 break;
2551 case RATE_MCS_CHAN_WIDTH_160:
2552 bw = "160Mhz";
2553 break;
2554 default:
2555 bw = "BAD BW";
2556 }
2557
2558 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
5aa33553 2559 type, rs_pretty_ant(ant), bw, mcs, nss,
1a61b347
ES		 2560 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2561 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
2562 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2563 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2564 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2565}
2566
a0c38b21
ES		 2567/**
2568 * Program the device to use fixed rate for frame transmit
2569 * This is for debugging/testing only
2570 * once the device start use fixed rate, we need to reload the module
2571 * to being back the normal operation.
2572 */
2573static void rs_program_fix_rate(struct iwl_mvm *mvm,
2574 struct iwl_lq_sta *lq_sta)
2575{
2576 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2577 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2578 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2579
2580 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
2581 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2582
2583 if (lq_sta->dbg_fixed_rate) {
8fc7c58c
ES		 2584 struct rs_rate rate;
2585 rs_rate_from_ucode_rate(lq_sta->dbg_fixed_rate,
2586 lq_sta->band, &rate);
2587 rs_fill_lq_cmd(NULL, NULL, lq_sta, &rate);
a0c38b21
ES		 2588 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
2589 }
2590}
2591
9d10849e
EG		 2592static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2593 const char __user *user_buf, size_t count, loff_t *ppos)
2594{
2595 struct iwl_lq_sta *lq_sta = file->private_data;
2596 struct iwl_mvm *mvm;
2597 char buf[64];
2598 size_t buf_size;
2599 u32 parsed_rate;
2600
2601
2602 mvm = lq_sta->drv;
2603 memset(buf, 0, sizeof(buf));
2604 buf_size = min(count, sizeof(buf) - 1);
2605 if (copy_from_user(buf, user_buf, buf_size))
2606 return -EFAULT;
2607
2608 if (sscanf(buf, "%x", &parsed_rate) == 1)
2609 lq_sta->dbg_fixed_rate = parsed_rate;
2610 else
2611 lq_sta->dbg_fixed_rate = 0;
2612
2613 rs_program_fix_rate(mvm, lq_sta);
2614
2615 return count;
2616}
2617
8ca151b5
JB		 2618static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2619 char __user *user_buf, size_t count, loff_t *ppos)
2620{
2621 char *buff;
2622 int desc = 0;
2623 int i = 0;
8ca151b5
JB		 2624 ssize_t ret;
2625
2626 struct iwl_lq_sta *lq_sta = file->private_data;
2627 struct iwl_mvm *mvm;
2628 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 2629 struct rs_rate *rate = &tbl->rate;
8ca151b5 2630 mvm = lq_sta->drv;
1a61b347 2631 buff = kmalloc(2048, GFP_KERNEL);
8ca151b5
JB		 2632 if (!buff)
2633 return -ENOMEM;
2634
2635 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2636 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2637 lq_sta->total_failed, lq_sta->total_success,
2638 lq_sta->active_legacy_rate);
2639 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2640 lq_sta->dbg_fixed_rate);
2641 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
ff402312
EG		 2642 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2643 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2644 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
8ca151b5 2645 desc += sprintf(buff+desc, "lq type %s\n",
5aa33553
ES		 2646 (is_legacy(rate)) ? "legacy" :
2647 is_vht(rate) ? "VHT" : "HT");
2648 if (!is_legacy(rate)) {
8ca151b5 2649 desc += sprintf(buff+desc, " %s",
5aa33553 2650 (is_siso(rate)) ? "SISO" : "MIMO2");
8ca151b5 2651 desc += sprintf(buff+desc, " %s",
5aa33553
ES		 2652 (is_ht20(rate)) ? "20MHz" :
2653 (is_ht40(rate)) ? "40MHz" :
2654 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
6a524f48 2655 desc += sprintf(buff+desc, " %s %s\n",
5aa33553 2656 (rate->sgi) ? "SGI" : "NGI",
6a524f48 2657 (lq_sta->is_agg) ? "AGG on" : "");
8ca151b5
JB		 2658 }
2659 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2660 lq_sta->last_rate_n_flags);
2661 desc += sprintf(buff+desc,
1a61b347 2662 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
8ca151b5
JB		 2663 lq_sta->lq.flags,
2664 lq_sta->lq.mimo_delim,
2665 lq_sta->lq.single_stream_ant_msk,
2666 lq_sta->lq.dual_stream_ant_msk);
2667
2668 desc += sprintf(buff+desc,
2669 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2670 le16_to_cpu(lq_sta->lq.agg_time_limit),
2671 lq_sta->lq.agg_disable_start_th,
2672 lq_sta->lq.agg_frame_cnt_limit);
2673
2674 desc += sprintf(buff+desc,
2675 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2676 lq_sta->lq.initial_rate_index[0],
2677 lq_sta->lq.initial_rate_index[1],
2678 lq_sta->lq.initial_rate_index[2],
2679 lq_sta->lq.initial_rate_index[3]);
2680
2681 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
1a61b347
ES		 2682 u32 rate = le32_to_cpu(lq_sta->lq.rs_table[i]);
2683 desc += sprintf(buff+desc,
2684 " rate[%d] 0x%X ",
2685 i, rate);
2686
2687 desc += rs_pretty_print_rate(buff+desc, rate);
8ca151b5
JB		 2688 }
2689
2690 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2691 kfree(buff);
2692 return ret;
2693}
2694
2695static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2696 .write = rs_sta_dbgfs_scale_table_write,
2697 .read = rs_sta_dbgfs_scale_table_read,
2698 .open = simple_open,
2699 .llseek = default_llseek,
2700};
2701static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2702 char __user *user_buf, size_t count, loff_t *ppos)
2703{
2704 char *buff;
2705 int desc = 0;
2706 int i, j;
2707 ssize_t ret;
d310e405 2708 struct iwl_scale_tbl_info *tbl;
5aa33553 2709 struct rs_rate *rate;
8ca151b5
JB		 2710 struct iwl_lq_sta *lq_sta = file->private_data;
2711
2712 buff = kmalloc(1024, GFP_KERNEL);
2713 if (!buff)
2714 return -ENOMEM;
2715
2716 for (i = 0; i < LQ_SIZE; i++) {
d310e405 2717 tbl = &(lq_sta->lq_info[i]);
5aa33553 2718 rate = &tbl->rate;
8ca151b5 2719 desc += sprintf(buff+desc,
6a524f48 2720 "%s type=%d SGI=%d BW=%s DUP=0\n"
8fc7c58c 2721 "index=%d\n",
8ca151b5 2722 lq_sta->active_tbl == i ? "*" : "x",
5aa33553
ES		 2723 rate->type,
2724 rate->sgi,
2725 is_ht20(rate) ? "20Mhz" :
2726 is_ht40(rate) ? "40Mhz" :
2727 is_ht80(rate) ? "80Mhz" : "ERR",
8fc7c58c 2728 rate->index);
8ca151b5
JB		 2729 for (j = 0; j < IWL_RATE_COUNT; j++) {
2730 desc += sprintf(buff+desc,
2731 "counter=%d success=%d %%=%d\n",
d310e405
ES		 2732 tbl->win[j].counter,
2733 tbl->win[j].success_counter,
2734 tbl->win[j].success_ratio);
8ca151b5
JB		 2735 }
2736 }
2737 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2738 kfree(buff);
2739 return ret;
2740}
2741
2742static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2743 .read = rs_sta_dbgfs_stats_table_read,
2744 .open = simple_open,
2745 .llseek = default_llseek,
2746};
2747
8ca151b5
JB		 2748static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2749{
2750 struct iwl_lq_sta *lq_sta = mvm_sta;
2751 lq_sta->rs_sta_dbgfs_scale_table_file =
2752 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2753 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2754 lq_sta->rs_sta_dbgfs_stats_table_file =
2755 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2756 lq_sta, &rs_sta_dbgfs_stats_table_ops);
8ca151b5
JB		 2757 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2758 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2759 &lq_sta->tx_agg_tid_en);
2760}
2761
2762static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2763{
2764 struct iwl_lq_sta *lq_sta = mvm_sta;
2765 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2766 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
8ca151b5
JB		 2767 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2768}
2769#endif
2770
2771/*
2772 * Initialization of rate scaling information is done by driver after
2773 * the station is added. Since mac80211 calls this function before a
2774 * station is added we ignore it.
2775 */
2776static void rs_rate_init_stub(void *mvm_r,
3de805cf
SW		 2777 struct ieee80211_supported_band *sband,
2778 struct cfg80211_chan_def *chandef,
2779 struct ieee80211_sta *sta, void *mvm_sta)
8ca151b5
JB		 2780{
2781}
2782static struct rate_control_ops rs_mvm_ops = {
2783 .module = NULL,
2784 .name = RS_NAME,
2785 .tx_status = rs_tx_status,
2786 .get_rate = rs_get_rate,
2787 .rate_init = rs_rate_init_stub,
2788 .alloc = rs_alloc,
2789 .free = rs_free,
2790 .alloc_sta = rs_alloc_sta,
2791 .free_sta = rs_free_sta,
b87c2179 2792 .rate_update = rs_rate_update,
8ca151b5
JB		 2793#ifdef CONFIG_MAC80211_DEBUGFS
2794 .add_sta_debugfs = rs_add_debugfs,
2795 .remove_sta_debugfs = rs_remove_debugfs,
2796#endif
2797};
2798
2799int iwl_mvm_rate_control_register(void)
2800{
2801 return ieee80211_rate_control_register(&rs_mvm_ops);
2802}
2803
2804void iwl_mvm_rate_control_unregister(void)
2805{
2806 ieee80211_rate_control_unregister(&rs_mvm_ops);
2807}
9ee718aa
EL		 2808
2809/**
2810 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2811 * Tx protection, according to this rquest and previous requests,
2812 * and send the LQ command.
9ee718aa
EL		 2813 * @mvmsta: The station
2814 * @enable: Enable Tx protection?
2815 */
e126b5d9
JB		 2816int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2817 bool enable)
9ee718aa 2818{
e126b5d9
JB		 2819 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2820
9ee718aa
EL		 2821 lockdep_assert_held(&mvm->mutex);
2822
2823 if (enable) {
2824 if (mvmsta->tx_protection == 0)
d307ec8d 2825 lq->flags |= LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 2826 mvmsta->tx_protection++;
2827 } else {
2828 mvmsta->tx_protection--;
2829 if (mvmsta->tx_protection == 0)
d307ec8d 2830 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 2831 }
2832
9e680946 2833 return iwl_mvm_send_lq_cmd(mvm, lq, false);
9ee718aa 2834}
Ubuntu Artful kernel mirror