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ARM: common: edma: Fix xbar mapping
[deliverable/linux.git] / drivers / net / wireless / iwlwifi / mvm / rs.c
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2014 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/skbuff.h>
28 #include <linux/slab.h>
29 #include <net/mac80211.h>
30
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/delay.h>
34
35 #include <linux/workqueue.h>
36 #include "rs.h"
37 #include "fw-api.h"
38 #include "sta.h"
39 #include "iwl-op-mode.h"
40 #include "mvm.h"
41
42 #define RS_NAME "iwl-mvm-rs"
43
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define RS_LEGACY_RETRIES_PER_RATE 1
46 #define RS_HT_VHT_RETRIES_PER_RATE 2
47 #define RS_HT_VHT_RETRIES_PER_RATE_TW 1
48 #define RS_INITIAL_MIMO_NUM_RATES 3
49 #define RS_INITIAL_SISO_NUM_RATES 3
50 #define RS_INITIAL_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM
51 #define RS_SECONDARY_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM
52 #define RS_SECONDARY_SISO_NUM_RATES 3
53 #define RS_SECONDARY_SISO_RETRIES 1
54
55 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
56 #define IWL_RATE_MIN_FAILURE_TH 3 /* min failures to calc tpt */
57 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
58
59 /* max allowed rate miss before sync LQ cmd */
60 #define IWL_MISSED_RATE_MAX 15
61 #define RS_STAY_IN_COLUMN_TIMEOUT (5*HZ)
62
63
64 static u8 rs_ht_to_legacy[] = {
65 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
66 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
67 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
68 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
69 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
70 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
71 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
72 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
73 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
74 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
75 };
76
77 static const u8 ant_toggle_lookup[] = {
78 [ANT_NONE] = ANT_NONE,
79 [ANT_A] = ANT_B,
80 [ANT_B] = ANT_C,
81 [ANT_AB] = ANT_BC,
82 [ANT_C] = ANT_A,
83 [ANT_AC] = ANT_AB,
84 [ANT_BC] = ANT_AC,
85 [ANT_ABC] = ANT_ABC,
86 };
87
88 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
89 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
90 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
93 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
94 IWL_RATE_##rp##M_INDEX, \
95 IWL_RATE_##rn##M_INDEX }
96
97 #define IWL_DECLARE_MCS_RATE(s) \
98 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
99 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
100 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
101 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
102 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
103 IWL_RATE_INVM_INDEX, \
104 IWL_RATE_INVM_INDEX }
105
106 /*
107 * Parameter order:
108 * rate, ht rate, prev rate, next rate
109 *
110 * If there isn't a valid next or previous rate then INV is used which
111 * maps to IWL_RATE_INVALID
112 *
113 */
114 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
115 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
116 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
117 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
118 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
119 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
120 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
121 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
122 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
123 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
124 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
125 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
126 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
127 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
128 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
129 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
130 };
131
132 enum rs_action {
133 RS_ACTION_STAY = 0,
134 RS_ACTION_DOWNSCALE = -1,
135 RS_ACTION_UPSCALE = 1,
136 };
137
138 enum rs_column_mode {
139 RS_INVALID = 0,
140 RS_LEGACY,
141 RS_SISO,
142 RS_MIMO2,
143 };
144
145 #define MAX_NEXT_COLUMNS 5
146 #define MAX_COLUMN_CHECKS 3
147
148 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
149 struct ieee80211_sta *sta,
150 struct iwl_scale_tbl_info *tbl);
151
152 struct rs_tx_column {
153 enum rs_column_mode mode;
154 u8 ant;
155 bool sgi;
156 enum rs_column next_columns[MAX_NEXT_COLUMNS];
157 allow_column_func_t checks[MAX_COLUMN_CHECKS];
158 };
159
160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
161 struct iwl_scale_tbl_info *tbl)
162 {
163 if (!sta->ht_cap.ht_supported)
164 return false;
165
166 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
167 return false;
168
169 if (num_of_ant(mvm->fw->valid_tx_ant) < 2)
170 return false;
171
172 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
173 return false;
174
175 return true;
176 }
177
178 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
179 struct iwl_scale_tbl_info *tbl)
180 {
181 if (!sta->ht_cap.ht_supported)
182 return false;
183
184 return true;
185 }
186
187 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
188 struct iwl_scale_tbl_info *tbl)
189 {
190 struct rs_rate *rate = &tbl->rate;
191 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
192 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
193
194 if (is_ht20(rate) && (ht_cap->cap &
195 IEEE80211_HT_CAP_SGI_20))
196 return true;
197 if (is_ht40(rate) && (ht_cap->cap &
198 IEEE80211_HT_CAP_SGI_40))
199 return true;
200 if (is_ht80(rate) && (vht_cap->cap &
201 IEEE80211_VHT_CAP_SHORT_GI_80))
202 return true;
203
204 return false;
205 }
206
207 static const struct rs_tx_column rs_tx_columns[] = {
208 [RS_COLUMN_LEGACY_ANT_A] = {
209 .mode = RS_LEGACY,
210 .ant = ANT_A,
211 .next_columns = {
212 RS_COLUMN_LEGACY_ANT_B,
213 RS_COLUMN_SISO_ANT_A,
214 RS_COLUMN_SISO_ANT_B,
215 RS_COLUMN_MIMO2,
216 RS_COLUMN_MIMO2_SGI,
217 },
218 },
219 [RS_COLUMN_LEGACY_ANT_B] = {
220 .mode = RS_LEGACY,
221 .ant = ANT_B,
222 .next_columns = {
223 RS_COLUMN_LEGACY_ANT_A,
224 RS_COLUMN_SISO_ANT_A,
225 RS_COLUMN_SISO_ANT_B,
226 RS_COLUMN_MIMO2,
227 RS_COLUMN_MIMO2_SGI,
228 },
229 },
230 [RS_COLUMN_SISO_ANT_A] = {
231 .mode = RS_SISO,
232 .ant = ANT_A,
233 .next_columns = {
234 RS_COLUMN_SISO_ANT_B,
235 RS_COLUMN_MIMO2,
236 RS_COLUMN_SISO_ANT_A_SGI,
237 RS_COLUMN_SISO_ANT_B_SGI,
238 RS_COLUMN_MIMO2_SGI,
239 },
240 .checks = {
241 rs_siso_allow,
242 },
243 },
244 [RS_COLUMN_SISO_ANT_B] = {
245 .mode = RS_SISO,
246 .ant = ANT_B,
247 .next_columns = {
248 RS_COLUMN_SISO_ANT_A,
249 RS_COLUMN_MIMO2,
250 RS_COLUMN_SISO_ANT_B_SGI,
251 RS_COLUMN_SISO_ANT_A_SGI,
252 RS_COLUMN_MIMO2_SGI,
253 },
254 .checks = {
255 rs_siso_allow,
256 },
257 },
258 [RS_COLUMN_SISO_ANT_A_SGI] = {
259 .mode = RS_SISO,
260 .ant = ANT_A,
261 .sgi = true,
262 .next_columns = {
263 RS_COLUMN_SISO_ANT_B_SGI,
264 RS_COLUMN_MIMO2_SGI,
265 RS_COLUMN_SISO_ANT_A,
266 RS_COLUMN_SISO_ANT_B,
267 RS_COLUMN_MIMO2,
268 },
269 .checks = {
270 rs_siso_allow,
271 rs_sgi_allow,
272 },
273 },
274 [RS_COLUMN_SISO_ANT_B_SGI] = {
275 .mode = RS_SISO,
276 .ant = ANT_B,
277 .sgi = true,
278 .next_columns = {
279 RS_COLUMN_SISO_ANT_A_SGI,
280 RS_COLUMN_MIMO2_SGI,
281 RS_COLUMN_SISO_ANT_B,
282 RS_COLUMN_SISO_ANT_A,
283 RS_COLUMN_MIMO2,
284 },
285 .checks = {
286 rs_siso_allow,
287 rs_sgi_allow,
288 },
289 },
290 [RS_COLUMN_MIMO2] = {
291 .mode = RS_MIMO2,
292 .ant = ANT_AB,
293 .next_columns = {
294 RS_COLUMN_SISO_ANT_A,
295 RS_COLUMN_SISO_ANT_B,
296 RS_COLUMN_SISO_ANT_A_SGI,
297 RS_COLUMN_SISO_ANT_B_SGI,
298 RS_COLUMN_MIMO2_SGI,
299 },
300 .checks = {
301 rs_mimo_allow,
302 },
303 },
304 [RS_COLUMN_MIMO2_SGI] = {
305 .mode = RS_MIMO2,
306 .ant = ANT_AB,
307 .sgi = true,
308 .next_columns = {
309 RS_COLUMN_SISO_ANT_A_SGI,
310 RS_COLUMN_SISO_ANT_B_SGI,
311 RS_COLUMN_SISO_ANT_A,
312 RS_COLUMN_SISO_ANT_B,
313 RS_COLUMN_MIMO2,
314 },
315 .checks = {
316 rs_mimo_allow,
317 rs_sgi_allow,
318 },
319 },
320 };
321
322 static inline u8 rs_extract_rate(u32 rate_n_flags)
323 {
324 /* also works for HT because bits 7:6 are zero there */
325 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
326 }
327
328 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
329 {
330 int idx = 0;
331
332 if (rate_n_flags & RATE_MCS_HT_MSK) {
333 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
334 idx += IWL_RATE_MCS_0_INDEX;
335
336 /* skip 9M not supported in HT*/
337 if (idx >= IWL_RATE_9M_INDEX)
338 idx += 1;
339 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
340 return idx;
341 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
342 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
343 idx += IWL_RATE_MCS_0_INDEX;
344
345 /* skip 9M not supported in VHT*/
346 if (idx >= IWL_RATE_9M_INDEX)
347 idx++;
348 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
349 return idx;
350 } else {
351 /* legacy rate format, search for match in table */
352
353 u8 legacy_rate = rs_extract_rate(rate_n_flags);
354 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
355 if (iwl_rates[idx].plcp == legacy_rate)
356 return idx;
357 }
358
359 return IWL_RATE_INVALID;
360 }
361
362 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
363 struct sk_buff *skb,
364 struct ieee80211_sta *sta,
365 struct iwl_lq_sta *lq_sta);
366 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
367 struct ieee80211_sta *sta,
368 struct iwl_lq_sta *lq_sta,
369 const struct rs_rate *initial_rate);
370 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
371
372 /**
373 * The following tables contain the expected throughput metrics for all rates
374 *
375 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
376 *
377 * where invalid entries are zeros.
378 *
379 * CCK rates are only valid in legacy table and will only be used in G
380 * (2.4 GHz) band.
381 */
382
383 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
384 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
385 };
386
387 /* Expected TpT tables. 4 indexes:
388 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
389 */
390 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
391 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
392 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
393 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
394 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
395 };
396
397 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
398 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
399 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
400 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
401 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
402 };
403
404 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
405 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
406 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
407 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
408 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
409 };
410
411 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
412 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
413 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
414 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
415 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
416 };
417
418 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
419 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
420 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
421 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
422 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
423 };
424
425 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
426 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
427 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
428 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
429 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
430 };
431
432 /* mbps, mcs */
433 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
434 { "1", "BPSK DSSS"},
435 { "2", "QPSK DSSS"},
436 {"5.5", "BPSK CCK"},
437 { "11", "QPSK CCK"},
438 { "6", "BPSK 1/2"},
439 { "9", "BPSK 1/2"},
440 { "12", "QPSK 1/2"},
441 { "18", "QPSK 3/4"},
442 { "24", "16QAM 1/2"},
443 { "36", "16QAM 3/4"},
444 { "48", "64QAM 2/3"},
445 { "54", "64QAM 3/4"},
446 { "60", "64QAM 5/6"},
447 };
448
449 #define MCS_INDEX_PER_STREAM (8)
450
451 static const char *rs_pretty_ant(u8 ant)
452 {
453 static const char * const ant_name[] = {
454 [ANT_NONE] = "None",
455 [ANT_A] = "A",
456 [ANT_B] = "B",
457 [ANT_AB] = "AB",
458 [ANT_C] = "C",
459 [ANT_AC] = "AC",
460 [ANT_BC] = "BC",
461 [ANT_ABC] = "ABC",
462 };
463
464 if (ant > ANT_ABC)
465 return "UNKNOWN";
466
467 return ant_name[ant];
468 }
469
470 static const char *rs_pretty_lq_type(enum iwl_table_type type)
471 {
472 static const char * const lq_types[] = {
473 [LQ_NONE] = "NONE",
474 [LQ_LEGACY_A] = "LEGACY_A",
475 [LQ_LEGACY_G] = "LEGACY_G",
476 [LQ_HT_SISO] = "HT SISO",
477 [LQ_HT_MIMO2] = "HT MIMO",
478 [LQ_VHT_SISO] = "VHT SISO",
479 [LQ_VHT_MIMO2] = "VHT MIMO",
480 };
481
482 if (type < LQ_NONE || type >= LQ_MAX)
483 return "UNKNOWN";
484
485 return lq_types[type];
486 }
487
488 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
489 const char *prefix)
490 {
491 IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
492 prefix, rs_pretty_lq_type(rate->type),
493 rate->index, rs_pretty_ant(rate->ant),
494 rate->bw, rate->sgi);
495 }
496
497 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
498 {
499 window->data = 0;
500 window->success_counter = 0;
501 window->success_ratio = IWL_INVALID_VALUE;
502 window->counter = 0;
503 window->average_tpt = IWL_INVALID_VALUE;
504 }
505
506 static void rs_rate_scale_clear_tbl_windows(struct iwl_scale_tbl_info *tbl)
507 {
508 int i;
509
510 for (i = 0; i < IWL_RATE_COUNT; i++)
511 rs_rate_scale_clear_window(&tbl->win[i]);
512 }
513
514 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
515 {
516 return (ant_type & valid_antenna) == ant_type;
517 }
518
519 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
520 struct iwl_lq_sta *lq_data, u8 tid,
521 struct ieee80211_sta *sta)
522 {
523 int ret = -EAGAIN;
524
525 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
526 sta->addr, tid);
527 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
528 if (ret == -EAGAIN) {
529 /*
530 * driver and mac80211 is out of sync
531 * this might be cause by reloading firmware
532 * stop the tx ba session here
533 */
534 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
535 tid);
536 ieee80211_stop_tx_ba_session(sta, tid);
537 }
538 return ret;
539 }
540
541 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
542 struct iwl_lq_sta *lq_data,
543 struct ieee80211_sta *sta)
544 {
545 if (tid < IWL_MAX_TID_COUNT)
546 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
547 else
548 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
549 tid, IWL_MAX_TID_COUNT);
550 }
551
552 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
553 {
554 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
555 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
556 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
557 }
558
559 /*
560 * Static function to get the expected throughput from an iwl_scale_tbl_info
561 * that wraps a NULL pointer check
562 */
563 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
564 {
565 if (tbl->expected_tpt)
566 return tbl->expected_tpt[rs_index];
567 return 0;
568 }
569
570 /**
571 * rs_collect_tx_data - Update the success/failure sliding window
572 *
573 * We keep a sliding window of the last 62 packets transmitted
574 * at this rate. window->data contains the bitmask of successful
575 * packets.
576 */
577 static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
578 int scale_index, int attempts, int successes,
579 struct iwl_rate_scale_data *window)
580 {
581 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
582 s32 fail_count, tpt;
583
584 /* Get expected throughput */
585 tpt = get_expected_tpt(tbl, scale_index);
586
587 /*
588 * Keep track of only the latest 62 tx frame attempts in this rate's
589 * history window; anything older isn't really relevant any more.
590 * If we have filled up the sliding window, drop the oldest attempt;
591 * if the oldest attempt (highest bit in bitmap) shows "success",
592 * subtract "1" from the success counter (this is the main reason
593 * we keep these bitmaps!).
594 */
595 while (attempts > 0) {
596 if (window->counter >= IWL_RATE_MAX_WINDOW) {
597 /* remove earliest */
598 window->counter = IWL_RATE_MAX_WINDOW - 1;
599
600 if (window->data & mask) {
601 window->data &= ~mask;
602 window->success_counter--;
603 }
604 }
605
606 /* Increment frames-attempted counter */
607 window->counter++;
608
609 /* Shift bitmap by one frame to throw away oldest history */
610 window->data <<= 1;
611
612 /* Mark the most recent #successes attempts as successful */
613 if (successes > 0) {
614 window->success_counter++;
615 window->data |= 0x1;
616 successes--;
617 }
618
619 attempts--;
620 }
621
622 /* Calculate current success ratio, avoid divide-by-0! */
623 if (window->counter > 0)
624 window->success_ratio = 128 * (100 * window->success_counter)
625 / window->counter;
626 else
627 window->success_ratio = IWL_INVALID_VALUE;
628
629 fail_count = window->counter - window->success_counter;
630
631 /* Calculate average throughput, if we have enough history. */
632 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
633 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
634 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
635 else
636 window->average_tpt = IWL_INVALID_VALUE;
637
638 return 0;
639 }
640
641 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
642 int scale_index, int attempts, int successes)
643 {
644 struct iwl_rate_scale_data *window = NULL;
645
646 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
647 return -EINVAL;
648
649 /* Select window for current tx bit rate */
650 window = &(tbl->win[scale_index]);
651
652 return _rs_collect_tx_data(tbl, scale_index, attempts, successes,
653 window);
654 }
655
656 /* Convert rs_rate object into ucode rate bitmask */
657 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
658 struct rs_rate *rate)
659 {
660 u32 ucode_rate = 0;
661 int index = rate->index;
662
663 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
664 RATE_MCS_ANT_ABC_MSK);
665
666 if (is_legacy(rate)) {
667 ucode_rate |= iwl_rates[index].plcp;
668 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
669 ucode_rate |= RATE_MCS_CCK_MSK;
670 return ucode_rate;
671 }
672
673 if (is_ht(rate)) {
674 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
675 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
676 index = IWL_LAST_HT_RATE;
677 }
678 ucode_rate |= RATE_MCS_HT_MSK;
679
680 if (is_ht_siso(rate))
681 ucode_rate |= iwl_rates[index].plcp_ht_siso;
682 else if (is_ht_mimo2(rate))
683 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
684 else
685 WARN_ON_ONCE(1);
686 } else if (is_vht(rate)) {
687 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
688 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
689 index = IWL_LAST_VHT_RATE;
690 }
691 ucode_rate |= RATE_MCS_VHT_MSK;
692 if (is_vht_siso(rate))
693 ucode_rate |= iwl_rates[index].plcp_vht_siso;
694 else if (is_vht_mimo2(rate))
695 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
696 else
697 WARN_ON_ONCE(1);
698
699 } else {
700 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
701 }
702
703 ucode_rate |= rate->bw;
704 if (rate->sgi)
705 ucode_rate |= RATE_MCS_SGI_MSK;
706
707 return ucode_rate;
708 }
709
710 /* Convert a ucode rate into an rs_rate object */
711 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
712 enum ieee80211_band band,
713 struct rs_rate *rate)
714 {
715 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
716 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
717 u8 nss;
718
719 memset(rate, 0, sizeof(*rate));
720 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
721
722 if (rate->index == IWL_RATE_INVALID)
723 return -EINVAL;
724
725 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
726
727 /* Legacy */
728 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
729 !(ucode_rate & RATE_MCS_VHT_MSK)) {
730 if (num_of_ant == 1) {
731 if (band == IEEE80211_BAND_5GHZ)
732 rate->type = LQ_LEGACY_A;
733 else
734 rate->type = LQ_LEGACY_G;
735 }
736
737 return 0;
738 }
739
740 /* HT or VHT */
741 if (ucode_rate & RATE_MCS_SGI_MSK)
742 rate->sgi = true;
743
744 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
745
746 if (ucode_rate & RATE_MCS_HT_MSK) {
747 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
748 RATE_HT_MCS_NSS_POS) + 1;
749
750 if (nss == 1) {
751 rate->type = LQ_HT_SISO;
752 WARN_ON_ONCE(num_of_ant != 1);
753 } else if (nss == 2) {
754 rate->type = LQ_HT_MIMO2;
755 WARN_ON_ONCE(num_of_ant != 2);
756 } else {
757 WARN_ON_ONCE(1);
758 }
759 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
760 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
761 RATE_VHT_MCS_NSS_POS) + 1;
762
763 if (nss == 1) {
764 rate->type = LQ_VHT_SISO;
765 WARN_ON_ONCE(num_of_ant != 1);
766 } else if (nss == 2) {
767 rate->type = LQ_VHT_MIMO2;
768 WARN_ON_ONCE(num_of_ant != 2);
769 } else {
770 WARN_ON_ONCE(1);
771 }
772 }
773
774 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
775 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
776 !is_vht(rate));
777
778 return 0;
779 }
780
781 /* switch to another antenna/antennas and return 1 */
782 /* if no other valid antenna found, return 0 */
783 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
784 {
785 u8 new_ant_type;
786
787 if (!rate->ant || rate->ant > ANT_ABC)
788 return 0;
789
790 if (!rs_is_valid_ant(valid_ant, rate->ant))
791 return 0;
792
793 new_ant_type = ant_toggle_lookup[rate->ant];
794
795 while ((new_ant_type != rate->ant) &&
796 !rs_is_valid_ant(valid_ant, new_ant_type))
797 new_ant_type = ant_toggle_lookup[new_ant_type];
798
799 if (new_ant_type == rate->ant)
800 return 0;
801
802 rate->ant = new_ant_type;
803
804 return 1;
805 }
806
807 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
808 struct rs_rate *rate)
809 {
810 if (is_legacy(rate))
811 return lq_sta->active_legacy_rate;
812 else if (is_siso(rate))
813 return lq_sta->active_siso_rate;
814 else if (is_mimo2(rate))
815 return lq_sta->active_mimo2_rate;
816
817 WARN_ON_ONCE(1);
818 return 0;
819 }
820
821 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
822 int rate_type)
823 {
824 u8 high = IWL_RATE_INVALID;
825 u8 low = IWL_RATE_INVALID;
826
827 /* 802.11A or ht walks to the next literal adjacent rate in
828 * the rate table */
829 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
830 int i;
831 u32 mask;
832
833 /* Find the previous rate that is in the rate mask */
834 i = index - 1;
835 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
836 if (rate_mask & mask) {
837 low = i;
838 break;
839 }
840 }
841
842 /* Find the next rate that is in the rate mask */
843 i = index + 1;
844 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
845 if (rate_mask & mask) {
846 high = i;
847 break;
848 }
849 }
850
851 return (high << 8) | low;
852 }
853
854 low = index;
855 while (low != IWL_RATE_INVALID) {
856 low = iwl_rates[low].prev_rs;
857 if (low == IWL_RATE_INVALID)
858 break;
859 if (rate_mask & (1 << low))
860 break;
861 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
862 }
863
864 high = index;
865 while (high != IWL_RATE_INVALID) {
866 high = iwl_rates[high].next_rs;
867 if (high == IWL_RATE_INVALID)
868 break;
869 if (rate_mask & (1 << high))
870 break;
871 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
872 }
873
874 return (high << 8) | low;
875 }
876
877 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
878 struct rs_rate *rate)
879 {
880 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
881 }
882
883 /* Get the next supported lower rate in the current column.
884 * Return true if bottom rate in the current column was reached
885 */
886 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
887 struct rs_rate *rate)
888 {
889 u8 low;
890 u16 high_low;
891 u16 rate_mask;
892 struct iwl_mvm *mvm = lq_sta->drv;
893
894 rate_mask = rs_get_supported_rates(lq_sta, rate);
895 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
896 rate->type);
897 low = high_low & 0xff;
898
899 /* Bottom rate of column reached */
900 if (low == IWL_RATE_INVALID)
901 return true;
902
903 rate->index = low;
904 return false;
905 }
906
907 /* Get the next rate to use following a column downgrade */
908 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
909 struct rs_rate *rate)
910 {
911 struct iwl_mvm *mvm = lq_sta->drv;
912
913 if (is_legacy(rate)) {
914 /* No column to downgrade from Legacy */
915 return;
916 } else if (is_siso(rate)) {
917 /* Downgrade to Legacy if we were in SISO */
918 if (lq_sta->band == IEEE80211_BAND_5GHZ)
919 rate->type = LQ_LEGACY_A;
920 else
921 rate->type = LQ_LEGACY_G;
922
923 rate->bw = RATE_MCS_CHAN_WIDTH_20;
924
925 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
926 rate->index > IWL_RATE_MCS_9_INDEX);
927
928 rate->index = rs_ht_to_legacy[rate->index];
929 } else {
930 /* Downgrade to SISO with same MCS if in MIMO */
931 rate->type = is_vht_mimo2(rate) ?
932 LQ_VHT_SISO : LQ_HT_SISO;
933 }
934
935
936 if (num_of_ant(rate->ant) > 1)
937 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
938
939 /* Relevant in both switching to SISO or Legacy */
940 rate->sgi = false;
941
942 if (!rs_rate_supported(lq_sta, rate))
943 rs_get_lower_rate_in_column(lq_sta, rate);
944 }
945
946 /* Simple function to compare two rate scale table types */
947 static inline bool rs_rate_match(struct rs_rate *a,
948 struct rs_rate *b)
949 {
950 return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
951 }
952
953 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
954 {
955 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
956 return RATE_MCS_CHAN_WIDTH_40;
957 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
958 return RATE_MCS_CHAN_WIDTH_80;
959 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
960 return RATE_MCS_CHAN_WIDTH_160;
961
962 return RATE_MCS_CHAN_WIDTH_20;
963 }
964
965 /*
966 * mac80211 sends us Tx status
967 */
968 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
969 struct ieee80211_sta *sta, void *priv_sta,
970 struct sk_buff *skb)
971 {
972 int legacy_success;
973 int retries;
974 int mac_index, i;
975 struct iwl_lq_sta *lq_sta = priv_sta;
976 struct iwl_lq_cmd *table;
977 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
978 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
979 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
980 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
981 enum mac80211_rate_control_flags mac_flags;
982 u32 ucode_rate;
983 struct rs_rate rate;
984 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
985
986 /* Treat uninitialized rate scaling data same as non-existing. */
987 if (!lq_sta) {
988 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
989 return;
990 } else if (!lq_sta->drv) {
991 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
992 return;
993 }
994
995 if (!ieee80211_is_data(hdr->frame_control) ||
996 info->flags & IEEE80211_TX_CTL_NO_ACK)
997 return;
998
999 /* This packet was aggregated but doesn't carry status info */
1000 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1001 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1002 return;
1003
1004 /*
1005 * Ignore this Tx frame response if its initial rate doesn't match
1006 * that of latest Link Quality command. There may be stragglers
1007 * from a previous Link Quality command, but we're no longer interested
1008 * in those; they're either from the "active" mode while we're trying
1009 * to check "search" mode, or a prior "search" mode after we've moved
1010 * to a new "search" mode (which might become the new "active" mode).
1011 */
1012 table = &lq_sta->lq;
1013 ucode_rate = le32_to_cpu(table->rs_table[0]);
1014 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1015 if (info->band == IEEE80211_BAND_5GHZ)
1016 rate.index -= IWL_FIRST_OFDM_RATE;
1017 mac_flags = info->status.rates[0].flags;
1018 mac_index = info->status.rates[0].idx;
1019 /* For HT packets, map MCS to PLCP */
1020 if (mac_flags & IEEE80211_TX_RC_MCS) {
1021 /* Remove # of streams */
1022 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1023 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1024 mac_index++;
1025 /*
1026 * mac80211 HT index is always zero-indexed; we need to move
1027 * HT OFDM rates after CCK rates in 2.4 GHz band
1028 */
1029 if (info->band == IEEE80211_BAND_2GHZ)
1030 mac_index += IWL_FIRST_OFDM_RATE;
1031 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1032 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1033 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1034 mac_index++;
1035 }
1036
1037 /* Here we actually compare this rate to the latest LQ command */
1038 if ((mac_index < 0) ||
1039 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1040 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1041 (rate.ant != info->status.antenna) ||
1042 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1043 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1044 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1045 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1046 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1047 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1048 (rate.index != mac_index)) {
1049 IWL_DEBUG_RATE(mvm,
1050 "initial rate %d does not match %d (0x%x)\n",
1051 mac_index, rate.index, ucode_rate);
1052 /*
1053 * Since rates mis-match, the last LQ command may have failed.
1054 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1055 * ... driver.
1056 */
1057 lq_sta->missed_rate_counter++;
1058 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1059 lq_sta->missed_rate_counter = 0;
1060 IWL_DEBUG_RATE(mvm,
1061 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1062 lq_sta->rs_state);
1063 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1064 }
1065 /* Regardless, ignore this status info for outdated rate */
1066 return;
1067 } else
1068 /* Rate did match, so reset the missed_rate_counter */
1069 lq_sta->missed_rate_counter = 0;
1070
1071 /* Figure out if rate scale algorithm is in active or search table */
1072 if (rs_rate_match(&rate,
1073 &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1074 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1075 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1076 } else if (rs_rate_match(&rate,
1077 &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1078 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1079 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1080 } else {
1081 IWL_DEBUG_RATE(mvm,
1082 "Neither active nor search matches tx rate\n");
1083 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1084 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1085 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1086 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1087 rs_dump_rate(mvm, &rate, "ACTUAL");
1088
1089 /*
1090 * no matching table found, let's by-pass the data collection
1091 * and continue to perform rate scale to find the rate table
1092 */
1093 rs_stay_in_table(lq_sta, true);
1094 goto done;
1095 }
1096
1097 /*
1098 * Updating the frame history depends on whether packets were
1099 * aggregated.
1100 *
1101 * For aggregation, all packets were transmitted at the same rate, the
1102 * first index into rate scale table.
1103 */
1104 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1105 ucode_rate = le32_to_cpu(table->rs_table[0]);
1106 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1107 rs_collect_tx_data(curr_tbl, rate.index,
1108 info->status.ampdu_len,
1109 info->status.ampdu_ack_len);
1110
1111 /* Update success/fail counts if not searching for new mode */
1112 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1113 lq_sta->total_success += info->status.ampdu_ack_len;
1114 lq_sta->total_failed += (info->status.ampdu_len -
1115 info->status.ampdu_ack_len);
1116 }
1117 } else {
1118 /*
1119 * For legacy, update frame history with for each Tx retry.
1120 */
1121 retries = info->status.rates[0].count - 1;
1122 /* HW doesn't send more than 15 retries */
1123 retries = min(retries, 15);
1124
1125 /* The last transmission may have been successful */
1126 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1127 /* Collect data for each rate used during failed TX attempts */
1128 for (i = 0; i <= retries; ++i) {
1129 ucode_rate = le32_to_cpu(table->rs_table[i]);
1130 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1131 /*
1132 * Only collect stats if retried rate is in the same RS
1133 * table as active/search.
1134 */
1135 if (rs_rate_match(&rate, &curr_tbl->rate))
1136 tmp_tbl = curr_tbl;
1137 else if (rs_rate_match(&rate, &other_tbl->rate))
1138 tmp_tbl = other_tbl;
1139 else
1140 continue;
1141
1142 rs_collect_tx_data(tmp_tbl, rate.index, 1,
1143 i < retries ? 0 : legacy_success);
1144 }
1145
1146 /* Update success/fail counts if not searching for new mode */
1147 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1148 lq_sta->total_success += legacy_success;
1149 lq_sta->total_failed += retries + (1 - legacy_success);
1150 }
1151 }
1152 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1153 lq_sta->last_rate_n_flags = ucode_rate;
1154 done:
1155 /* See if there's a better rate or modulation mode to try. */
1156 if (sta && sta->supp_rates[sband->band])
1157 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1158 }
1159
1160 /*
1161 * Begin a period of staying with a selected modulation mode.
1162 * Set "stay_in_tbl" flag to prevent any mode switches.
1163 * Set frame tx success limits according to legacy vs. high-throughput,
1164 * and reset overall (spanning all rates) tx success history statistics.
1165 * These control how long we stay using same modulation mode before
1166 * searching for a new mode.
1167 */
1168 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1169 struct iwl_lq_sta *lq_sta)
1170 {
1171 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1172 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1173 if (is_legacy) {
1174 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1175 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1176 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1177 } else {
1178 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1179 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1180 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1181 }
1182 lq_sta->table_count = 0;
1183 lq_sta->total_failed = 0;
1184 lq_sta->total_success = 0;
1185 lq_sta->flush_timer = jiffies;
1186 lq_sta->visited_columns = 0;
1187 }
1188
1189 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1190 const struct rs_tx_column *column,
1191 u32 bw)
1192 {
1193 /* Used to choose among HT tables */
1194 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1195
1196 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1197 column->mode != RS_SISO &&
1198 column->mode != RS_MIMO2))
1199 return expected_tpt_legacy;
1200
1201 /* Legacy rates have only one table */
1202 if (column->mode == RS_LEGACY)
1203 return expected_tpt_legacy;
1204
1205 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1206 /* Choose among many HT tables depending on number of streams
1207 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1208 * status */
1209 if (column->mode == RS_SISO) {
1210 switch (bw) {
1211 case RATE_MCS_CHAN_WIDTH_20:
1212 ht_tbl_pointer = expected_tpt_siso_20MHz;
1213 break;
1214 case RATE_MCS_CHAN_WIDTH_40:
1215 ht_tbl_pointer = expected_tpt_siso_40MHz;
1216 break;
1217 case RATE_MCS_CHAN_WIDTH_80:
1218 ht_tbl_pointer = expected_tpt_siso_80MHz;
1219 break;
1220 default:
1221 WARN_ON_ONCE(1);
1222 }
1223 } else if (column->mode == RS_MIMO2) {
1224 switch (bw) {
1225 case RATE_MCS_CHAN_WIDTH_20:
1226 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1227 break;
1228 case RATE_MCS_CHAN_WIDTH_40:
1229 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1230 break;
1231 case RATE_MCS_CHAN_WIDTH_80:
1232 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1233 break;
1234 default:
1235 WARN_ON_ONCE(1);
1236 }
1237 } else {
1238 WARN_ON_ONCE(1);
1239 }
1240
1241 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1242 return ht_tbl_pointer[0];
1243 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1244 return ht_tbl_pointer[1];
1245 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1246 return ht_tbl_pointer[2];
1247 else /* AGG+SGI */
1248 return ht_tbl_pointer[3];
1249 }
1250
1251 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1252 struct iwl_scale_tbl_info *tbl)
1253 {
1254 struct rs_rate *rate = &tbl->rate;
1255 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1256
1257 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1258 }
1259
1260 /*
1261 * Find starting rate for new "search" high-throughput mode of modulation.
1262 * Goal is to find lowest expected rate (under perfect conditions) that is
1263 * above the current measured throughput of "active" mode, to give new mode
1264 * a fair chance to prove itself without too many challenges.
1265 *
1266 * This gets called when transitioning to more aggressive modulation
1267 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1268 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1269 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1270 * bit rate will typically need to increase, but not if performance was bad.
1271 */
1272 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1273 struct iwl_lq_sta *lq_sta,
1274 struct iwl_scale_tbl_info *tbl, /* "search" */
1275 u16 rate_mask, s8 index)
1276 {
1277 /* "active" values */
1278 struct iwl_scale_tbl_info *active_tbl =
1279 &(lq_sta->lq_info[lq_sta->active_tbl]);
1280 s32 active_sr = active_tbl->win[index].success_ratio;
1281 s32 active_tpt = active_tbl->expected_tpt[index];
1282 /* expected "search" throughput */
1283 const u16 *tpt_tbl = tbl->expected_tpt;
1284
1285 s32 new_rate, high, low, start_hi;
1286 u16 high_low;
1287 s8 rate = index;
1288
1289 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1290
1291 while (1) {
1292 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1293 tbl->rate.type);
1294
1295 low = high_low & 0xff;
1296 high = (high_low >> 8) & 0xff;
1297
1298 /*
1299 * Lower the "search" bit rate, to give new "search" mode
1300 * approximately the same throughput as "active" if:
1301 *
1302 * 1) "Active" mode has been working modestly well (but not
1303 * great), and expected "search" throughput (under perfect
1304 * conditions) at candidate rate is above the actual
1305 * measured "active" throughput (but less than expected
1306 * "active" throughput under perfect conditions).
1307 * OR
1308 * 2) "Active" mode has been working perfectly or very well
1309 * and expected "search" throughput (under perfect
1310 * conditions) at candidate rate is above expected
1311 * "active" throughput (under perfect conditions).
1312 */
1313 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1314 ((active_sr > RS_SR_FORCE_DECREASE) &&
1315 (active_sr <= IWL_RATE_HIGH_TH) &&
1316 (tpt_tbl[rate] <= active_tpt))) ||
1317 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1318 (tpt_tbl[rate] > active_tpt))) {
1319 /* (2nd or later pass)
1320 * If we've already tried to raise the rate, and are
1321 * now trying to lower it, use the higher rate. */
1322 if (start_hi != IWL_RATE_INVALID) {
1323 new_rate = start_hi;
1324 break;
1325 }
1326
1327 new_rate = rate;
1328
1329 /* Loop again with lower rate */
1330 if (low != IWL_RATE_INVALID)
1331 rate = low;
1332
1333 /* Lower rate not available, use the original */
1334 else
1335 break;
1336
1337 /* Else try to raise the "search" rate to match "active" */
1338 } else {
1339 /* (2nd or later pass)
1340 * If we've already tried to lower the rate, and are
1341 * now trying to raise it, use the lower rate. */
1342 if (new_rate != IWL_RATE_INVALID)
1343 break;
1344
1345 /* Loop again with higher rate */
1346 else if (high != IWL_RATE_INVALID) {
1347 start_hi = high;
1348 rate = high;
1349
1350 /* Higher rate not available, use the original */
1351 } else {
1352 new_rate = rate;
1353 break;
1354 }
1355 }
1356 }
1357
1358 return new_rate;
1359 }
1360
1361 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1362 {
1363 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1364 return RATE_MCS_CHAN_WIDTH_80;
1365 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1366 return RATE_MCS_CHAN_WIDTH_40;
1367
1368 return RATE_MCS_CHAN_WIDTH_20;
1369 }
1370
1371 /*
1372 * Check whether we should continue using same modulation mode, or
1373 * begin search for a new mode, based on:
1374 * 1) # tx successes or failures while using this mode
1375 * 2) # times calling this function
1376 * 3) elapsed time in this mode (not used, for now)
1377 */
1378 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1379 {
1380 struct iwl_scale_tbl_info *tbl;
1381 int active_tbl;
1382 int flush_interval_passed = 0;
1383 struct iwl_mvm *mvm;
1384
1385 mvm = lq_sta->drv;
1386 active_tbl = lq_sta->active_tbl;
1387
1388 tbl = &(lq_sta->lq_info[active_tbl]);
1389
1390 /* If we've been disallowing search, see if we should now allow it */
1391 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1392 /* Elapsed time using current modulation mode */
1393 if (lq_sta->flush_timer)
1394 flush_interval_passed =
1395 time_after(jiffies,
1396 (unsigned long)(lq_sta->flush_timer +
1397 RS_STAY_IN_COLUMN_TIMEOUT));
1398
1399 /*
1400 * Check if we should allow search for new modulation mode.
1401 * If many frames have failed or succeeded, or we've used
1402 * this same modulation for a long time, allow search, and
1403 * reset history stats that keep track of whether we should
1404 * allow a new search. Also (below) reset all bitmaps and
1405 * stats in active history.
1406 */
1407 if (force_search ||
1408 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1409 (lq_sta->total_success > lq_sta->max_success_limit) ||
1410 ((!lq_sta->search_better_tbl) &&
1411 (lq_sta->flush_timer) && (flush_interval_passed))) {
1412 IWL_DEBUG_RATE(mvm,
1413 "LQ: stay is expired %d %d %d\n",
1414 lq_sta->total_failed,
1415 lq_sta->total_success,
1416 flush_interval_passed);
1417
1418 /* Allow search for new mode */
1419 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1420 IWL_DEBUG_RATE(mvm,
1421 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1422 lq_sta->total_failed = 0;
1423 lq_sta->total_success = 0;
1424 lq_sta->flush_timer = 0;
1425 /* mark the current column as visited */
1426 lq_sta->visited_columns = BIT(tbl->column);
1427 /*
1428 * Else if we've used this modulation mode enough repetitions
1429 * (regardless of elapsed time or success/failure), reset
1430 * history bitmaps and rate-specific stats for all rates in
1431 * active table.
1432 */
1433 } else {
1434 lq_sta->table_count++;
1435 if (lq_sta->table_count >=
1436 lq_sta->table_count_limit) {
1437 lq_sta->table_count = 0;
1438
1439 IWL_DEBUG_RATE(mvm,
1440 "LQ: stay in table clear win\n");
1441 rs_rate_scale_clear_tbl_windows(tbl);
1442 }
1443 }
1444
1445 /* If transitioning to allow "search", reset all history
1446 * bitmaps and stats in active table (this will become the new
1447 * "search" table). */
1448 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1449 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
1450 rs_rate_scale_clear_tbl_windows(tbl);
1451 }
1452 }
1453 }
1454
1455 /*
1456 * setup rate table in uCode
1457 */
1458 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1459 struct ieee80211_sta *sta,
1460 struct iwl_lq_sta *lq_sta,
1461 struct rs_rate *rate)
1462 {
1463 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1464 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1465 }
1466
1467 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1468 struct ieee80211_hdr *hdr)
1469 {
1470 u8 tid = IWL_MAX_TID_COUNT;
1471
1472 if (ieee80211_is_data_qos(hdr->frame_control)) {
1473 u8 *qc = ieee80211_get_qos_ctl(hdr);
1474 tid = qc[0] & 0xf;
1475 }
1476
1477 if (unlikely(tid > IWL_MAX_TID_COUNT))
1478 tid = IWL_MAX_TID_COUNT;
1479
1480 return tid;
1481 }
1482
1483 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1484 struct iwl_lq_sta *lq_sta,
1485 struct ieee80211_sta *sta,
1486 struct iwl_scale_tbl_info *tbl)
1487 {
1488 int i, j, n;
1489 enum rs_column next_col_id;
1490 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1491 const struct rs_tx_column *next_col;
1492 allow_column_func_t allow_func;
1493 u8 valid_ants = mvm->fw->valid_tx_ant;
1494 const u16 *expected_tpt_tbl;
1495 s32 tpt, max_expected_tpt;
1496
1497 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1498 next_col_id = curr_col->next_columns[i];
1499
1500 if (next_col_id == RS_COLUMN_INVALID)
1501 continue;
1502
1503 if (lq_sta->visited_columns & BIT(next_col_id)) {
1504 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1505 next_col_id);
1506 continue;
1507 }
1508
1509 next_col = &rs_tx_columns[next_col_id];
1510
1511 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1512 IWL_DEBUG_RATE(mvm,
1513 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1514 next_col_id, valid_ants, next_col->ant);
1515 continue;
1516 }
1517
1518 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1519 allow_func = next_col->checks[j];
1520 if (allow_func && !allow_func(mvm, sta, tbl))
1521 break;
1522 }
1523
1524 if (j != MAX_COLUMN_CHECKS) {
1525 IWL_DEBUG_RATE(mvm,
1526 "Skip column %d: not allowed (check %d failed)\n",
1527 next_col_id, j);
1528
1529 continue;
1530 }
1531
1532 tpt = lq_sta->last_tpt / 100;
1533 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1534 tbl->rate.bw);
1535 if (WARN_ON_ONCE(!expected_tpt_tbl))
1536 continue;
1537
1538 max_expected_tpt = 0;
1539 for (n = 0; n < IWL_RATE_COUNT; n++)
1540 if (expected_tpt_tbl[n] > max_expected_tpt)
1541 max_expected_tpt = expected_tpt_tbl[n];
1542
1543 if (tpt >= max_expected_tpt) {
1544 IWL_DEBUG_RATE(mvm,
1545 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1546 next_col_id, max_expected_tpt, tpt);
1547 continue;
1548 }
1549
1550 break;
1551 }
1552
1553 if (i == MAX_NEXT_COLUMNS)
1554 return RS_COLUMN_INVALID;
1555
1556 IWL_DEBUG_RATE(mvm, "Found potential column %d\n", next_col_id);
1557
1558 return next_col_id;
1559 }
1560
1561 static int rs_switch_to_column(struct iwl_mvm *mvm,
1562 struct iwl_lq_sta *lq_sta,
1563 struct ieee80211_sta *sta,
1564 enum rs_column col_id)
1565 {
1566 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1567 struct iwl_scale_tbl_info *search_tbl =
1568 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1569 struct rs_rate *rate = &search_tbl->rate;
1570 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1571 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1572 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1573 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1574 u16 rate_mask = 0;
1575 u32 rate_idx = 0;
1576
1577 memcpy(search_tbl, tbl, sz);
1578
1579 rate->sgi = column->sgi;
1580 rate->ant = column->ant;
1581
1582 if (column->mode == RS_LEGACY) {
1583 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1584 rate->type = LQ_LEGACY_A;
1585 else
1586 rate->type = LQ_LEGACY_G;
1587
1588 rate_mask = lq_sta->active_legacy_rate;
1589 } else if (column->mode == RS_SISO) {
1590 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1591 rate_mask = lq_sta->active_siso_rate;
1592 } else if (column->mode == RS_MIMO2) {
1593 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1594 rate_mask = lq_sta->active_mimo2_rate;
1595 } else {
1596 WARN_ON_ONCE("Bad column mode");
1597 }
1598
1599 rate->bw = rs_bw_from_sta_bw(sta);
1600 search_tbl->column = col_id;
1601 rs_set_expected_tpt_table(lq_sta, search_tbl);
1602
1603 lq_sta->visited_columns |= BIT(col_id);
1604
1605 /* Get the best matching rate if we're changing modes. e.g.
1606 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1607 */
1608 if (curr_column->mode != column->mode) {
1609 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1610 rate_mask, rate->index);
1611
1612 if ((rate_idx == IWL_RATE_INVALID) ||
1613 !(BIT(rate_idx) & rate_mask)) {
1614 IWL_DEBUG_RATE(mvm,
1615 "can not switch with index %d"
1616 " rate mask %x\n",
1617 rate_idx, rate_mask);
1618
1619 goto err;
1620 }
1621
1622 rate->index = rate_idx;
1623 }
1624
1625 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1626 col_id, rate->index);
1627
1628 return 0;
1629
1630 err:
1631 rate->type = LQ_NONE;
1632 return -1;
1633 }
1634
1635 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1636 struct iwl_scale_tbl_info *tbl,
1637 s32 sr, int low, int high,
1638 int current_tpt,
1639 int low_tpt, int high_tpt)
1640 {
1641 enum rs_action action = RS_ACTION_STAY;
1642
1643 /* Too many failures, decrease rate */
1644 if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1645 IWL_DEBUG_RATE(mvm,
1646 "decrease rate because of low SR\n");
1647 action = RS_ACTION_DOWNSCALE;
1648 /* No throughput measured yet for adjacent rates; try increase. */
1649 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1650 (high_tpt == IWL_INVALID_VALUE)) {
1651 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) {
1652 IWL_DEBUG_RATE(mvm,
1653 "Good SR and no high rate measurement. "
1654 "Increase rate\n");
1655 action = RS_ACTION_UPSCALE;
1656 } else if (low != IWL_RATE_INVALID) {
1657 IWL_DEBUG_RATE(mvm,
1658 "Remain in current rate\n");
1659 action = RS_ACTION_STAY;
1660 }
1661 }
1662
1663 /* Both adjacent throughputs are measured, but neither one has better
1664 * throughput; we're using the best rate, don't change it!
1665 */
1666 else if ((low_tpt != IWL_INVALID_VALUE) &&
1667 (high_tpt != IWL_INVALID_VALUE) &&
1668 (low_tpt < current_tpt) &&
1669 (high_tpt < current_tpt)) {
1670 IWL_DEBUG_RATE(mvm,
1671 "Both high and low are worse. "
1672 "Maintain rate\n");
1673 action = RS_ACTION_STAY;
1674 }
1675
1676 /* At least one adjacent rate's throughput is measured,
1677 * and may have better performance.
1678 */
1679 else {
1680 /* Higher adjacent rate's throughput is measured */
1681 if (high_tpt != IWL_INVALID_VALUE) {
1682 /* Higher rate has better throughput */
1683 if (high_tpt > current_tpt &&
1684 sr >= IWL_RATE_INCREASE_TH) {
1685 IWL_DEBUG_RATE(mvm,
1686 "Higher rate is better and good "
1687 "SR. Increate rate\n");
1688 action = RS_ACTION_UPSCALE;
1689 } else {
1690 IWL_DEBUG_RATE(mvm,
1691 "Higher rate isn't better OR "
1692 "no good SR. Maintain rate\n");
1693 action = RS_ACTION_STAY;
1694 }
1695
1696 /* Lower adjacent rate's throughput is measured */
1697 } else if (low_tpt != IWL_INVALID_VALUE) {
1698 /* Lower rate has better throughput */
1699 if (low_tpt > current_tpt) {
1700 IWL_DEBUG_RATE(mvm,
1701 "Lower rate is better. "
1702 "Decrease rate\n");
1703 action = RS_ACTION_DOWNSCALE;
1704 } else if (sr >= IWL_RATE_INCREASE_TH) {
1705 IWL_DEBUG_RATE(mvm,
1706 "Lower rate isn't better and "
1707 "good SR. Increase rate\n");
1708 action = RS_ACTION_UPSCALE;
1709 }
1710 }
1711 }
1712
1713 /* Sanity check; asked for decrease, but success rate or throughput
1714 * has been good at old rate. Don't change it.
1715 */
1716 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID) &&
1717 ((sr > IWL_RATE_HIGH_TH) ||
1718 (current_tpt > (100 * tbl->expected_tpt[low])))) {
1719 IWL_DEBUG_RATE(mvm,
1720 "Sanity check failed. Maintain rate\n");
1721 action = RS_ACTION_STAY;
1722 }
1723
1724 return action;
1725 }
1726
1727 /*
1728 * Do rate scaling and search for new modulation mode.
1729 */
1730 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1731 struct sk_buff *skb,
1732 struct ieee80211_sta *sta,
1733 struct iwl_lq_sta *lq_sta)
1734 {
1735 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1736 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1737 int low = IWL_RATE_INVALID;
1738 int high = IWL_RATE_INVALID;
1739 int index;
1740 struct iwl_rate_scale_data *window = NULL;
1741 int current_tpt = IWL_INVALID_VALUE;
1742 int low_tpt = IWL_INVALID_VALUE;
1743 int high_tpt = IWL_INVALID_VALUE;
1744 u32 fail_count;
1745 enum rs_action scale_action = RS_ACTION_STAY;
1746 u16 rate_mask;
1747 u8 update_lq = 0;
1748 struct iwl_scale_tbl_info *tbl, *tbl1;
1749 u8 active_tbl = 0;
1750 u8 done_search = 0;
1751 u16 high_low;
1752 s32 sr;
1753 u8 tid = IWL_MAX_TID_COUNT;
1754 u8 prev_agg = lq_sta->is_agg;
1755 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1756 struct iwl_mvm_tid_data *tid_data;
1757 struct rs_rate *rate;
1758
1759 /* Send management frames and NO_ACK data using lowest rate. */
1760 /* TODO: this could probably be improved.. */
1761 if (!ieee80211_is_data(hdr->frame_control) ||
1762 info->flags & IEEE80211_TX_CTL_NO_ACK)
1763 return;
1764
1765 tid = rs_get_tid(lq_sta, hdr);
1766 if ((tid != IWL_MAX_TID_COUNT) &&
1767 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1768 tid_data = &sta_priv->tid_data[tid];
1769 if (tid_data->state == IWL_AGG_OFF)
1770 lq_sta->is_agg = 0;
1771 else
1772 lq_sta->is_agg = 1;
1773 } else {
1774 lq_sta->is_agg = 0;
1775 }
1776
1777 /*
1778 * Select rate-scale / modulation-mode table to work with in
1779 * the rest of this function: "search" if searching for better
1780 * modulation mode, or "active" if doing rate scaling within a mode.
1781 */
1782 if (!lq_sta->search_better_tbl)
1783 active_tbl = lq_sta->active_tbl;
1784 else
1785 active_tbl = 1 - lq_sta->active_tbl;
1786
1787 tbl = &(lq_sta->lq_info[active_tbl]);
1788 rate = &tbl->rate;
1789
1790 if (prev_agg != lq_sta->is_agg) {
1791 IWL_DEBUG_RATE(mvm,
1792 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
1793 prev_agg, lq_sta->is_agg);
1794 rs_set_expected_tpt_table(lq_sta, tbl);
1795 }
1796
1797 /* current tx rate */
1798 index = lq_sta->last_txrate_idx;
1799
1800 /* rates available for this association, and for modulation mode */
1801 rate_mask = rs_get_supported_rates(lq_sta, rate);
1802
1803 if (!(BIT(index) & rate_mask)) {
1804 IWL_ERR(mvm, "Current Rate is not valid\n");
1805 if (lq_sta->search_better_tbl) {
1806 /* revert to active table if search table is not valid*/
1807 rate->type = LQ_NONE;
1808 lq_sta->search_better_tbl = 0;
1809 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1810 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
1811 }
1812 return;
1813 }
1814
1815 /* Get expected throughput table and history window for current rate */
1816 if (!tbl->expected_tpt) {
1817 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1818 return;
1819 }
1820
1821 /* force user max rate if set by user */
1822 if ((lq_sta->max_rate_idx != -1) &&
1823 (lq_sta->max_rate_idx < index)) {
1824 index = lq_sta->max_rate_idx;
1825 update_lq = 1;
1826 window = &(tbl->win[index]);
1827 IWL_DEBUG_RATE(mvm,
1828 "Forcing user max rate %d\n",
1829 index);
1830 goto lq_update;
1831 }
1832
1833 window = &(tbl->win[index]);
1834
1835 /*
1836 * If there is not enough history to calculate actual average
1837 * throughput, keep analyzing results of more tx frames, without
1838 * changing rate or mode (bypass most of the rest of this function).
1839 * Set up new rate table in uCode only if old rate is not supported
1840 * in current association (use new rate found above).
1841 */
1842 fail_count = window->counter - window->success_counter;
1843 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1844 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1845 IWL_DEBUG_RATE(mvm,
1846 "(%s: %d): Test Window: succ %d total %d\n",
1847 rs_pretty_lq_type(rate->type),
1848 index, window->success_counter, window->counter);
1849
1850 /* Can't calculate this yet; not enough history */
1851 window->average_tpt = IWL_INVALID_VALUE;
1852
1853 /* Should we stay with this modulation mode,
1854 * or search for a new one? */
1855 rs_stay_in_table(lq_sta, false);
1856
1857 goto out;
1858 }
1859 /* Else we have enough samples; calculate estimate of
1860 * actual average throughput */
1861 if (window->average_tpt != ((window->success_ratio *
1862 tbl->expected_tpt[index] + 64) / 128)) {
1863 window->average_tpt = ((window->success_ratio *
1864 tbl->expected_tpt[index] + 64) / 128);
1865 }
1866
1867 /* If we are searching for better modulation mode, check success. */
1868 if (lq_sta->search_better_tbl) {
1869 /* If good success, continue using the "search" mode;
1870 * no need to send new link quality command, since we're
1871 * continuing to use the setup that we've been trying. */
1872 if (window->average_tpt > lq_sta->last_tpt) {
1873 IWL_DEBUG_RATE(mvm,
1874 "SWITCHING TO NEW TABLE SR: %d "
1875 "cur-tpt %d old-tpt %d\n",
1876 window->success_ratio,
1877 window->average_tpt,
1878 lq_sta->last_tpt);
1879
1880 /* Swap tables; "search" becomes "active" */
1881 lq_sta->active_tbl = active_tbl;
1882 current_tpt = window->average_tpt;
1883 /* Else poor success; go back to mode in "active" table */
1884 } else {
1885 IWL_DEBUG_RATE(mvm,
1886 "GOING BACK TO THE OLD TABLE: SR %d "
1887 "cur-tpt %d old-tpt %d\n",
1888 window->success_ratio,
1889 window->average_tpt,
1890 lq_sta->last_tpt);
1891
1892 /* Nullify "search" table */
1893 rate->type = LQ_NONE;
1894
1895 /* Revert to "active" table */
1896 active_tbl = lq_sta->active_tbl;
1897 tbl = &(lq_sta->lq_info[active_tbl]);
1898
1899 /* Revert to "active" rate and throughput info */
1900 index = tbl->rate.index;
1901 current_tpt = lq_sta->last_tpt;
1902
1903 /* Need to set up a new rate table in uCode */
1904 update_lq = 1;
1905 }
1906
1907 /* Either way, we've made a decision; modulation mode
1908 * search is done, allow rate adjustment next time. */
1909 lq_sta->search_better_tbl = 0;
1910 done_search = 1; /* Don't switch modes below! */
1911 goto lq_update;
1912 }
1913
1914 /* (Else) not in search of better modulation mode, try for better
1915 * starting rate, while staying in this mode. */
1916 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
1917 low = high_low & 0xff;
1918 high = (high_low >> 8) & 0xff;
1919
1920 /* If user set max rate, dont allow higher than user constrain */
1921 if ((lq_sta->max_rate_idx != -1) &&
1922 (lq_sta->max_rate_idx < high))
1923 high = IWL_RATE_INVALID;
1924
1925 sr = window->success_ratio;
1926
1927 /* Collect measured throughputs for current and adjacent rates */
1928 current_tpt = window->average_tpt;
1929 if (low != IWL_RATE_INVALID)
1930 low_tpt = tbl->win[low].average_tpt;
1931 if (high != IWL_RATE_INVALID)
1932 high_tpt = tbl->win[high].average_tpt;
1933
1934 IWL_DEBUG_RATE(mvm,
1935 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
1936 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
1937 low, high, low_tpt, high_tpt);
1938
1939 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
1940 current_tpt, low_tpt, high_tpt);
1941
1942 /* Force a search in case BT doesn't like us being in MIMO */
1943 if (is_mimo(rate) &&
1944 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
1945 IWL_DEBUG_RATE(mvm,
1946 "BT Coex forbids MIMO. Search for new config\n");
1947 rs_stay_in_table(lq_sta, true);
1948 goto lq_update;
1949 }
1950
1951 switch (scale_action) {
1952 case RS_ACTION_DOWNSCALE:
1953 /* Decrease starting rate, update uCode's rate table */
1954 if (low != IWL_RATE_INVALID) {
1955 update_lq = 1;
1956 index = low;
1957 } else {
1958 IWL_DEBUG_RATE(mvm,
1959 "At the bottom rate. Can't decrease\n");
1960 }
1961
1962 break;
1963 case RS_ACTION_UPSCALE:
1964 /* Increase starting rate, update uCode's rate table */
1965 if (high != IWL_RATE_INVALID) {
1966 update_lq = 1;
1967 index = high;
1968 } else {
1969 IWL_DEBUG_RATE(mvm,
1970 "At the top rate. Can't increase\n");
1971 }
1972
1973 break;
1974 case RS_ACTION_STAY:
1975 /* No change */
1976 default:
1977 break;
1978 }
1979
1980 lq_update:
1981 /* Replace uCode's rate table for the destination station. */
1982 if (update_lq) {
1983 tbl->rate.index = index;
1984 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
1985 }
1986
1987 rs_stay_in_table(lq_sta, false);
1988
1989 /*
1990 * Search for new modulation mode if we're:
1991 * 1) Not changing rates right now
1992 * 2) Not just finishing up a search
1993 * 3) Allowing a new search
1994 */
1995 if (!update_lq && !done_search &&
1996 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
1997 && window->counter) {
1998 enum rs_column next_column;
1999
2000 /* Save current throughput to compare with "search" throughput*/
2001 lq_sta->last_tpt = current_tpt;
2002
2003 IWL_DEBUG_RATE(mvm,
2004 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2005 update_lq, done_search, lq_sta->rs_state,
2006 window->counter);
2007
2008 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2009 if (next_column != RS_COLUMN_INVALID) {
2010 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2011 next_column);
2012 if (!ret)
2013 lq_sta->search_better_tbl = 1;
2014 } else {
2015 IWL_DEBUG_RATE(mvm,
2016 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2017 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2018 }
2019
2020 /* If new "search" mode was selected, set up in uCode table */
2021 if (lq_sta->search_better_tbl) {
2022 /* Access the "search" table, clear its history. */
2023 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2024 rs_rate_scale_clear_tbl_windows(tbl);
2025
2026 /* Use new "search" start rate */
2027 index = tbl->rate.index;
2028
2029 rs_dump_rate(mvm, &tbl->rate,
2030 "Switch to SEARCH TABLE:");
2031 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2032 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2033 } else {
2034 done_search = 1;
2035 }
2036 }
2037
2038 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2039 /* If the "active" (non-search) mode was legacy,
2040 * and we've tried switching antennas,
2041 * but we haven't been able to try HT modes (not available),
2042 * stay with best antenna legacy modulation for a while
2043 * before next round of mode comparisons. */
2044 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2045 if (is_legacy(&tbl1->rate) && !sta->ht_cap.ht_supported) {
2046 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2047 rs_set_stay_in_table(mvm, 1, lq_sta);
2048 } else {
2049 /* If we're in an HT mode, and all 3 mode switch actions
2050 * have been tried and compared, stay in this best modulation
2051 * mode for a while before next round of mode comparisons. */
2052 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2053 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2054 (tid != IWL_MAX_TID_COUNT)) {
2055 tid_data = &sta_priv->tid_data[tid];
2056 if (tid_data->state == IWL_AGG_OFF) {
2057 IWL_DEBUG_RATE(mvm,
2058 "try to aggregate tid %d\n",
2059 tid);
2060 rs_tl_turn_on_agg(mvm, tid,
2061 lq_sta, sta);
2062 }
2063 }
2064 rs_set_stay_in_table(mvm, 0, lq_sta);
2065 }
2066 }
2067
2068 out:
2069 lq_sta->last_txrate_idx = index;
2070 }
2071
2072 /**
2073 * rs_initialize_lq - Initialize a station's hardware rate table
2074 *
2075 * The uCode's station table contains a table of fallback rates
2076 * for automatic fallback during transmission.
2077 *
2078 * NOTE: This sets up a default set of values. These will be replaced later
2079 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2080 * rc80211_simple.
2081 *
2082 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2083 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2084 * which requires station table entry to exist).
2085 */
2086 static void rs_initialize_lq(struct iwl_mvm *mvm,
2087 struct ieee80211_sta *sta,
2088 struct iwl_lq_sta *lq_sta,
2089 enum ieee80211_band band,
2090 bool init)
2091 {
2092 struct iwl_scale_tbl_info *tbl;
2093 struct rs_rate *rate;
2094 int i;
2095 u8 active_tbl = 0;
2096 u8 valid_tx_ant;
2097
2098 if (!sta || !lq_sta)
2099 return;
2100
2101 i = lq_sta->last_txrate_idx;
2102
2103 valid_tx_ant = mvm->fw->valid_tx_ant;
2104
2105 if (!lq_sta->search_better_tbl)
2106 active_tbl = lq_sta->active_tbl;
2107 else
2108 active_tbl = 1 - lq_sta->active_tbl;
2109
2110 tbl = &(lq_sta->lq_info[active_tbl]);
2111 rate = &tbl->rate;
2112
2113 if ((i < 0) || (i >= IWL_RATE_COUNT))
2114 i = 0;
2115
2116 rate->index = i;
2117 rate->ant = first_antenna(valid_tx_ant);
2118 rate->sgi = false;
2119 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2120 if (band == IEEE80211_BAND_5GHZ)
2121 rate->type = LQ_LEGACY_A;
2122 else
2123 rate->type = LQ_LEGACY_G;
2124
2125 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2126 if (rate->ant == ANT_A)
2127 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2128 else
2129 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2130
2131 rs_set_expected_tpt_table(lq_sta, tbl);
2132 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2133 /* TODO restore station should remember the lq cmd */
2134 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2135 }
2136
2137 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2138 struct ieee80211_tx_rate_control *txrc)
2139 {
2140 struct sk_buff *skb = txrc->skb;
2141 struct ieee80211_supported_band *sband = txrc->sband;
2142 struct iwl_op_mode *op_mode __maybe_unused =
2143 (struct iwl_op_mode *)mvm_r;
2144 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2145 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2146 struct iwl_lq_sta *lq_sta = mvm_sta;
2147
2148 /* Get max rate if user set max rate */
2149 if (lq_sta) {
2150 lq_sta->max_rate_idx = txrc->max_rate_idx;
2151 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2152 (lq_sta->max_rate_idx != -1))
2153 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2154 if ((lq_sta->max_rate_idx < 0) ||
2155 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2156 lq_sta->max_rate_idx = -1;
2157 }
2158
2159 /* Treat uninitialized rate scaling data same as non-existing. */
2160 if (lq_sta && !lq_sta->drv) {
2161 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2162 mvm_sta = NULL;
2163 }
2164
2165 /* Send management frames and NO_ACK data using lowest rate. */
2166 if (rate_control_send_low(sta, mvm_sta, txrc))
2167 return;
2168
2169 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2170 info->band, &info->control.rates[0]);
2171
2172 info->control.rates[0].count = 1;
2173 }
2174
2175 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2176 gfp_t gfp)
2177 {
2178 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2179 struct iwl_op_mode *op_mode __maybe_unused =
2180 (struct iwl_op_mode *)mvm_rate;
2181 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2182
2183 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2184
2185 return &sta_priv->lq_sta;
2186 }
2187
2188 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2189 int nss)
2190 {
2191 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2192 (0x3 << (2 * (nss - 1)));
2193 rx_mcs >>= (2 * (nss - 1));
2194
2195 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2196 return IWL_RATE_MCS_7_INDEX;
2197 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2198 return IWL_RATE_MCS_8_INDEX;
2199 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2200 return IWL_RATE_MCS_9_INDEX;
2201
2202 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2203 return -1;
2204 }
2205
2206 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2207 struct ieee80211_sta_vht_cap *vht_cap,
2208 struct iwl_lq_sta *lq_sta)
2209 {
2210 int i;
2211 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2212
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
2218 /* Disable MCS9 as a workaround */
2219 if (i == IWL_RATE_MCS_9_INDEX)
2220 continue;
2221
2222 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2223 if (i == IWL_RATE_MCS_9_INDEX &&
2224 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2225 continue;
2226
2227 lq_sta->active_siso_rate |= BIT(i);
2228 }
2229 }
2230
2231 if (sta->rx_nss < 2)
2232 return;
2233
2234 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2235 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2236 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2237 if (i == IWL_RATE_9M_INDEX)
2238 continue;
2239
2240 /* Disable MCS9 as a workaround */
2241 if (i == IWL_RATE_MCS_9_INDEX)
2242 continue;
2243
2244 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2245 if (i == IWL_RATE_MCS_9_INDEX &&
2246 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2247 continue;
2248
2249 lq_sta->active_mimo2_rate |= BIT(i);
2250 }
2251 }
2252 }
2253
2254 #ifdef CONFIG_IWLWIFI_DEBUGFS
2255 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2256 struct iwl_mvm_frame_stats *stats)
2257 {
2258 spin_lock_bh(&mvm->drv_stats_lock);
2259 memset(stats, 0, sizeof(*stats));
2260 spin_unlock_bh(&mvm->drv_stats_lock);
2261 }
2262
2263 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2264 struct iwl_mvm_frame_stats *stats,
2265 u32 rate, bool agg)
2266 {
2267 u8 nss = 0, mcs = 0;
2268
2269 spin_lock(&mvm->drv_stats_lock);
2270
2271 if (agg)
2272 stats->agg_frames++;
2273
2274 stats->success_frames++;
2275
2276 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2277 case RATE_MCS_CHAN_WIDTH_20:
2278 stats->bw_20_frames++;
2279 break;
2280 case RATE_MCS_CHAN_WIDTH_40:
2281 stats->bw_40_frames++;
2282 break;
2283 case RATE_MCS_CHAN_WIDTH_80:
2284 stats->bw_80_frames++;
2285 break;
2286 default:
2287 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2288 }
2289
2290 if (rate & RATE_MCS_HT_MSK) {
2291 stats->ht_frames++;
2292 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2293 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2294 } else if (rate & RATE_MCS_VHT_MSK) {
2295 stats->vht_frames++;
2296 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2297 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2298 RATE_VHT_MCS_NSS_POS) + 1;
2299 } else {
2300 stats->legacy_frames++;
2301 }
2302
2303 if (nss == 1)
2304 stats->siso_frames++;
2305 else if (nss == 2)
2306 stats->mimo2_frames++;
2307
2308 if (rate & RATE_MCS_SGI_MSK)
2309 stats->sgi_frames++;
2310 else
2311 stats->ngi_frames++;
2312
2313 stats->last_rates[stats->last_frame_idx] = rate;
2314 stats->last_frame_idx = (stats->last_frame_idx + 1) %
2315 ARRAY_SIZE(stats->last_rates);
2316
2317 spin_unlock(&mvm->drv_stats_lock);
2318 }
2319 #endif
2320
2321 /*
2322 * Called after adding a new station to initialize rate scaling
2323 */
2324 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2325 enum ieee80211_band band, bool init)
2326 {
2327 int i, j;
2328 struct ieee80211_hw *hw = mvm->hw;
2329 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2330 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2331 struct iwl_mvm_sta *sta_priv;
2332 struct iwl_lq_sta *lq_sta;
2333 struct ieee80211_supported_band *sband;
2334 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2335
2336 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2337 lq_sta = &sta_priv->lq_sta;
2338 memset(lq_sta, 0, sizeof(*lq_sta));
2339
2340 sband = hw->wiphy->bands[band];
2341
2342 lq_sta->lq.sta_id = sta_priv->sta_id;
2343
2344 for (j = 0; j < LQ_SIZE; j++)
2345 rs_rate_scale_clear_tbl_windows(&lq_sta->lq_info[j]);
2346
2347 lq_sta->flush_timer = 0;
2348
2349 IWL_DEBUG_RATE(mvm,
2350 "LQ: *** rate scale station global init for station %d ***\n",
2351 sta_priv->sta_id);
2352 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2353 * the lowest or the highest rate.. Could consider using RSSI from
2354 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2355 * after assoc.. */
2356
2357 lq_sta->max_rate_idx = -1;
2358 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2359 lq_sta->band = sband->band;
2360 /*
2361 * active legacy rates as per supported rates bitmap
2362 */
2363 supp = sta->supp_rates[sband->band];
2364 lq_sta->active_legacy_rate = 0;
2365 for_each_set_bit(i, &supp, BITS_PER_LONG)
2366 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2367
2368 /* TODO: should probably account for rx_highest for both HT/VHT */
2369 if (!vht_cap || !vht_cap->vht_supported) {
2370 /* active_siso_rate mask includes 9 MBits (bit 5),
2371 * and CCK (bits 0-3), supp_rates[] does not;
2372 * shift to convert format, force 9 MBits off.
2373 */
2374 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2375 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2376 lq_sta->active_siso_rate &= ~((u16)0x2);
2377 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2378
2379 /* Same here */
2380 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2381 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2382 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2383 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2384
2385 lq_sta->is_vht = false;
2386 } else {
2387 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2388 lq_sta->is_vht = true;
2389 }
2390
2391 IWL_DEBUG_RATE(mvm,
2392 "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
2393 lq_sta->active_siso_rate,
2394 lq_sta->active_mimo2_rate,
2395 lq_sta->is_vht);
2396
2397 /* These values will be overridden later */
2398 lq_sta->lq.single_stream_ant_msk =
2399 first_antenna(mvm->fw->valid_tx_ant);
2400 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2401
2402 /* as default allow aggregation for all tids */
2403 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2404 lq_sta->drv = mvm;
2405
2406 /* Set last_txrate_idx to lowest rate */
2407 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2408 if (sband->band == IEEE80211_BAND_5GHZ)
2409 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2410 lq_sta->is_agg = 0;
2411 #ifdef CONFIG_MAC80211_DEBUGFS
2412 lq_sta->dbg_fixed_rate = 0;
2413 #endif
2414 #ifdef CONFIG_IWLWIFI_DEBUGFS
2415 iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2416 #endif
2417 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2418 }
2419
2420 static void rs_rate_update(void *mvm_r,
2421 struct ieee80211_supported_band *sband,
2422 struct cfg80211_chan_def *chandef,
2423 struct ieee80211_sta *sta, void *priv_sta,
2424 u32 changed)
2425 {
2426 u8 tid;
2427 struct iwl_op_mode *op_mode =
2428 (struct iwl_op_mode *)mvm_r;
2429 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2430
2431 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2432 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2433 ieee80211_stop_tx_ba_session(sta, tid);
2434
2435 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2436 }
2437
2438 #ifdef CONFIG_MAC80211_DEBUGFS
2439 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2440 struct iwl_lq_cmd *lq_cmd,
2441 enum ieee80211_band band,
2442 u32 ucode_rate)
2443 {
2444 struct rs_rate rate;
2445 int i;
2446 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2447 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2448
2449 for (i = 0; i < num_rates; i++)
2450 lq_cmd->rs_table[i] = ucode_rate_le32;
2451
2452 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2453
2454 if (is_mimo(&rate))
2455 lq_cmd->mimo_delim = num_rates - 1;
2456 else
2457 lq_cmd->mimo_delim = 0;
2458 }
2459 #endif /* CONFIG_MAC80211_DEBUGFS */
2460
2461 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2462 struct iwl_lq_sta *lq_sta,
2463 struct rs_rate *rate,
2464 __le32 *rs_table, int *rs_table_index,
2465 int num_rates, int num_retries,
2466 u8 valid_tx_ant, bool toggle_ant)
2467 {
2468 int i, j;
2469 __le32 ucode_rate;
2470 bool bottom_reached = false;
2471 int prev_rate_idx = rate->index;
2472 int end = LINK_QUAL_MAX_RETRY_NUM;
2473 int index = *rs_table_index;
2474
2475 for (i = 0; i < num_rates && index < end; i++) {
2476 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2477 for (j = 0; j < num_retries && index < end; j++, index++)
2478 rs_table[index] = ucode_rate;
2479
2480 if (toggle_ant)
2481 rs_toggle_antenna(valid_tx_ant, rate);
2482
2483 prev_rate_idx = rate->index;
2484 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2485 if (bottom_reached && !is_legacy(rate))
2486 break;
2487 }
2488
2489 if (!bottom_reached)
2490 rate->index = prev_rate_idx;
2491
2492 *rs_table_index = index;
2493 }
2494
2495 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2496 * column the rate table should look like this:
2497 *
2498 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2499 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2500 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2501 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2502 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2503 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2504 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2505 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2506 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2507 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2508 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2509 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2510 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2511 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2512 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2513 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2514 */
2515 static void rs_build_rates_table(struct iwl_mvm *mvm,
2516 struct iwl_lq_sta *lq_sta,
2517 const struct rs_rate *initial_rate)
2518 {
2519 struct rs_rate rate;
2520 int num_rates, num_retries, index = 0;
2521 u8 valid_tx_ant = 0;
2522 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2523 bool toggle_ant = false;
2524
2525 memcpy(&rate, initial_rate, sizeof(rate));
2526
2527 valid_tx_ant = mvm->fw->valid_tx_ant;
2528
2529 if (is_siso(&rate)) {
2530 num_rates = RS_INITIAL_SISO_NUM_RATES;
2531 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2532 } else if (is_mimo(&rate)) {
2533 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2534 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2535 } else {
2536 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2537 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2538 toggle_ant = true;
2539 }
2540
2541 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2542 num_rates, num_retries, valid_tx_ant,
2543 toggle_ant);
2544
2545 rs_get_lower_rate_down_column(lq_sta, &rate);
2546
2547 if (is_siso(&rate)) {
2548 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2549 num_retries = RS_SECONDARY_SISO_RETRIES;
2550 } else if (is_legacy(&rate)) {
2551 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2552 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2553 } else {
2554 WARN_ON_ONCE(1);
2555 }
2556
2557 toggle_ant = true;
2558
2559 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2560 num_rates, num_retries, valid_tx_ant,
2561 toggle_ant);
2562
2563 rs_get_lower_rate_down_column(lq_sta, &rate);
2564
2565 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2566 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2567
2568 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2569 num_rates, num_retries, valid_tx_ant,
2570 toggle_ant);
2571
2572 }
2573
2574 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2575 struct ieee80211_sta *sta,
2576 struct iwl_lq_sta *lq_sta,
2577 const struct rs_rate *initial_rate)
2578 {
2579 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2580 u8 ant = initial_rate->ant;
2581
2582 #ifdef CONFIG_MAC80211_DEBUGFS
2583 if (lq_sta->dbg_fixed_rate) {
2584 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2585 lq_sta->band,
2586 lq_sta->dbg_fixed_rate);
2587 ant = (lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
2588 RATE_MCS_ANT_POS;
2589 } else
2590 #endif
2591 rs_build_rates_table(mvm, lq_sta, initial_rate);
2592
2593 if (num_of_ant(ant) == 1)
2594 lq_cmd->single_stream_ant_msk = ant;
2595
2596 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2597 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2598
2599 lq_cmd->agg_time_limit =
2600 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2601
2602 if (sta)
2603 lq_cmd->agg_time_limit =
2604 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
2605 }
2606
2607 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2608 {
2609 return hw->priv;
2610 }
2611 /* rate scale requires free function to be implemented */
2612 static void rs_free(void *mvm_rate)
2613 {
2614 return;
2615 }
2616
2617 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2618 void *mvm_sta)
2619 {
2620 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2621 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2622
2623 IWL_DEBUG_RATE(mvm, "enter\n");
2624 IWL_DEBUG_RATE(mvm, "leave\n");
2625 }
2626
2627 #ifdef CONFIG_MAC80211_DEBUGFS
2628 int rs_pretty_print_rate(char *buf, const u32 rate)
2629 {
2630
2631 char *type, *bw;
2632 u8 mcs = 0, nss = 0;
2633 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2634
2635 if (!(rate & RATE_MCS_HT_MSK) &&
2636 !(rate & RATE_MCS_VHT_MSK)) {
2637 int index = iwl_hwrate_to_plcp_idx(rate);
2638
2639 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2640 rs_pretty_ant(ant),
2641 index == IWL_RATE_INVALID ? "BAD" :
2642 iwl_rate_mcs[index].mbps);
2643 }
2644
2645 if (rate & RATE_MCS_VHT_MSK) {
2646 type = "VHT";
2647 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2648 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2649 >> RATE_VHT_MCS_NSS_POS) + 1;
2650 } else if (rate & RATE_MCS_HT_MSK) {
2651 type = "HT";
2652 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2653 } else {
2654 type = "Unknown"; /* shouldn't happen */
2655 }
2656
2657 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2658 case RATE_MCS_CHAN_WIDTH_20:
2659 bw = "20Mhz";
2660 break;
2661 case RATE_MCS_CHAN_WIDTH_40:
2662 bw = "40Mhz";
2663 break;
2664 case RATE_MCS_CHAN_WIDTH_80:
2665 bw = "80Mhz";
2666 break;
2667 case RATE_MCS_CHAN_WIDTH_160:
2668 bw = "160Mhz";
2669 break;
2670 default:
2671 bw = "BAD BW";
2672 }
2673
2674 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2675 type, rs_pretty_ant(ant), bw, mcs, nss,
2676 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2677 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
2678 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2679 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2680 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2681 }
2682
2683 /**
2684 * Program the device to use fixed rate for frame transmit
2685 * This is for debugging/testing only
2686 * once the device start use fixed rate, we need to reload the module
2687 * to being back the normal operation.
2688 */
2689 static void rs_program_fix_rate(struct iwl_mvm *mvm,
2690 struct iwl_lq_sta *lq_sta)
2691 {
2692 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2693 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2694 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2695
2696 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
2697 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2698
2699 if (lq_sta->dbg_fixed_rate) {
2700 struct rs_rate rate;
2701 rs_rate_from_ucode_rate(lq_sta->dbg_fixed_rate,
2702 lq_sta->band, &rate);
2703 rs_fill_lq_cmd(mvm, NULL, lq_sta, &rate);
2704 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
2705 }
2706 }
2707
2708 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2709 const char __user *user_buf, size_t count, loff_t *ppos)
2710 {
2711 struct iwl_lq_sta *lq_sta = file->private_data;
2712 struct iwl_mvm *mvm;
2713 char buf[64];
2714 size_t buf_size;
2715 u32 parsed_rate;
2716
2717
2718 mvm = lq_sta->drv;
2719 memset(buf, 0, sizeof(buf));
2720 buf_size = min(count, sizeof(buf) - 1);
2721 if (copy_from_user(buf, user_buf, buf_size))
2722 return -EFAULT;
2723
2724 if (sscanf(buf, "%x", &parsed_rate) == 1)
2725 lq_sta->dbg_fixed_rate = parsed_rate;
2726 else
2727 lq_sta->dbg_fixed_rate = 0;
2728
2729 rs_program_fix_rate(mvm, lq_sta);
2730
2731 return count;
2732 }
2733
2734 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2735 char __user *user_buf, size_t count, loff_t *ppos)
2736 {
2737 char *buff;
2738 int desc = 0;
2739 int i = 0;
2740 ssize_t ret;
2741
2742 struct iwl_lq_sta *lq_sta = file->private_data;
2743 struct iwl_mvm *mvm;
2744 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2745 struct rs_rate *rate = &tbl->rate;
2746 mvm = lq_sta->drv;
2747 buff = kmalloc(2048, GFP_KERNEL);
2748 if (!buff)
2749 return -ENOMEM;
2750
2751 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2752 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2753 lq_sta->total_failed, lq_sta->total_success,
2754 lq_sta->active_legacy_rate);
2755 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2756 lq_sta->dbg_fixed_rate);
2757 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2758 (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
2759 (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
2760 (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
2761 desc += sprintf(buff+desc, "lq type %s\n",
2762 (is_legacy(rate)) ? "legacy" :
2763 is_vht(rate) ? "VHT" : "HT");
2764 if (!is_legacy(rate)) {
2765 desc += sprintf(buff+desc, " %s",
2766 (is_siso(rate)) ? "SISO" : "MIMO2");
2767 desc += sprintf(buff+desc, " %s",
2768 (is_ht20(rate)) ? "20MHz" :
2769 (is_ht40(rate)) ? "40MHz" :
2770 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
2771 desc += sprintf(buff+desc, " %s %s\n",
2772 (rate->sgi) ? "SGI" : "NGI",
2773 (lq_sta->is_agg) ? "AGG on" : "");
2774 }
2775 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2776 lq_sta->last_rate_n_flags);
2777 desc += sprintf(buff+desc,
2778 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
2779 lq_sta->lq.flags,
2780 lq_sta->lq.mimo_delim,
2781 lq_sta->lq.single_stream_ant_msk,
2782 lq_sta->lq.dual_stream_ant_msk);
2783
2784 desc += sprintf(buff+desc,
2785 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2786 le16_to_cpu(lq_sta->lq.agg_time_limit),
2787 lq_sta->lq.agg_disable_start_th,
2788 lq_sta->lq.agg_frame_cnt_limit);
2789
2790 desc += sprintf(buff+desc,
2791 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2792 lq_sta->lq.initial_rate_index[0],
2793 lq_sta->lq.initial_rate_index[1],
2794 lq_sta->lq.initial_rate_index[2],
2795 lq_sta->lq.initial_rate_index[3]);
2796
2797 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2798 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
2799
2800 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
2801 desc += rs_pretty_print_rate(buff+desc, r);
2802 }
2803
2804 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2805 kfree(buff);
2806 return ret;
2807 }
2808
2809 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2810 .write = rs_sta_dbgfs_scale_table_write,
2811 .read = rs_sta_dbgfs_scale_table_read,
2812 .open = simple_open,
2813 .llseek = default_llseek,
2814 };
2815 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2816 char __user *user_buf, size_t count, loff_t *ppos)
2817 {
2818 char *buff;
2819 int desc = 0;
2820 int i, j;
2821 ssize_t ret;
2822 struct iwl_scale_tbl_info *tbl;
2823 struct rs_rate *rate;
2824 struct iwl_lq_sta *lq_sta = file->private_data;
2825
2826 buff = kmalloc(1024, GFP_KERNEL);
2827 if (!buff)
2828 return -ENOMEM;
2829
2830 for (i = 0; i < LQ_SIZE; i++) {
2831 tbl = &(lq_sta->lq_info[i]);
2832 rate = &tbl->rate;
2833 desc += sprintf(buff+desc,
2834 "%s type=%d SGI=%d BW=%s DUP=0\n"
2835 "index=%d\n",
2836 lq_sta->active_tbl == i ? "*" : "x",
2837 rate->type,
2838 rate->sgi,
2839 is_ht20(rate) ? "20Mhz" :
2840 is_ht40(rate) ? "40Mhz" :
2841 is_ht80(rate) ? "80Mhz" : "ERR",
2842 rate->index);
2843 for (j = 0; j < IWL_RATE_COUNT; j++) {
2844 desc += sprintf(buff+desc,
2845 "counter=%d success=%d %%=%d\n",
2846 tbl->win[j].counter,
2847 tbl->win[j].success_counter,
2848 tbl->win[j].success_ratio);
2849 }
2850 }
2851 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2852 kfree(buff);
2853 return ret;
2854 }
2855
2856 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2857 .read = rs_sta_dbgfs_stats_table_read,
2858 .open = simple_open,
2859 .llseek = default_llseek,
2860 };
2861
2862 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2863 {
2864 struct iwl_lq_sta *lq_sta = mvm_sta;
2865 lq_sta->rs_sta_dbgfs_scale_table_file =
2866 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2867 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2868 lq_sta->rs_sta_dbgfs_stats_table_file =
2869 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2870 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2871 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2872 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2873 &lq_sta->tx_agg_tid_en);
2874 }
2875
2876 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2877 {
2878 struct iwl_lq_sta *lq_sta = mvm_sta;
2879 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2880 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2881 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2882 }
2883 #endif
2884
2885 /*
2886 * Initialization of rate scaling information is done by driver after
2887 * the station is added. Since mac80211 calls this function before a
2888 * station is added we ignore it.
2889 */
2890 static void rs_rate_init_stub(void *mvm_r,
2891 struct ieee80211_supported_band *sband,
2892 struct cfg80211_chan_def *chandef,
2893 struct ieee80211_sta *sta, void *mvm_sta)
2894 {
2895 }
2896
2897 static const struct rate_control_ops rs_mvm_ops = {
2898 .name = RS_NAME,
2899 .tx_status = rs_tx_status,
2900 .get_rate = rs_get_rate,
2901 .rate_init = rs_rate_init_stub,
2902 .alloc = rs_alloc,
2903 .free = rs_free,
2904 .alloc_sta = rs_alloc_sta,
2905 .free_sta = rs_free_sta,
2906 .rate_update = rs_rate_update,
2907 #ifdef CONFIG_MAC80211_DEBUGFS
2908 .add_sta_debugfs = rs_add_debugfs,
2909 .remove_sta_debugfs = rs_remove_debugfs,
2910 #endif
2911 };
2912
2913 int iwl_mvm_rate_control_register(void)
2914 {
2915 return ieee80211_rate_control_register(&rs_mvm_ops);
2916 }
2917
2918 void iwl_mvm_rate_control_unregister(void)
2919 {
2920 ieee80211_rate_control_unregister(&rs_mvm_ops);
2921 }
2922
2923 /**
2924 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2925 * Tx protection, according to this rquest and previous requests,
2926 * and send the LQ command.
2927 * @mvmsta: The station
2928 * @enable: Enable Tx protection?
2929 */
2930 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2931 bool enable)
2932 {
2933 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2934
2935 lockdep_assert_held(&mvm->mutex);
2936
2937 if (enable) {
2938 if (mvmsta->tx_protection == 0)
2939 lq->flags |= LQ_FLAG_USE_RTS_MSK;
2940 mvmsta->tx_protection++;
2941 } else {
2942 mvmsta->tx_protection--;
2943 if (mvmsta->tx_protection == 0)
2944 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
2945 }
2946
2947 return iwl_mvm_send_lq_cmd(mvm, lq, false);
2948 }
Linux kernel - Deliverables
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