1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
4 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
5 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
6 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
7 * Copyright(c) 2018 - 2019 Intel Corporation
10 * Intel Linux Wireless <linuxwifi@intel.com>
11 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
13 *****************************************************************************/
14 #include <linux/kernel.h>
15 #include <linux/skbuff.h>
16 #include <linux/slab.h>
17 #include <net/mac80211.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/delay.h>
23 #include <linux/workqueue.h>
27 #include "iwl-op-mode.h"
31 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
33 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
34 * Use this macro when dealing with thresholds consts set as a percentage
36 #define RS_PERCENT(x) (128 * x)
38 static u8 rs_ht_to_legacy[] = {
39 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
40 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
41 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
42 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
43 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
44 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
45 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
46 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
47 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
48 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
51 static const u8 ant_toggle_lookup[] = {
52 [ANT_NONE] = ANT_NONE,
58 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
59 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
60 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
61 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
62 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
63 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
64 IWL_RATE_##rp##M_INDEX, \
65 IWL_RATE_##rn##M_INDEX }
67 #define IWL_DECLARE_MCS_RATE(s) \
68 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
69 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
70 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
71 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
72 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
73 IWL_RATE_INVM_INDEX, \
78 * rate, ht rate, prev rate, next rate
80 * If there isn't a valid next or previous rate then INV is used which
81 * maps to IWL_RATE_INVALID
84 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
85 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
86 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
87 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
88 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
89 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
90 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
91 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
92 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
93 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
94 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
95 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
96 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
97 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
98 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
99 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
104 RS_ACTION_DOWNSCALE = -1,
105 RS_ACTION_UPSCALE = 1,
108 enum rs_column_mode {
115 #define MAX_NEXT_COLUMNS 7
116 #define MAX_COLUMN_CHECKS 3
120 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
121 struct ieee80211_sta *sta,
122 struct rs_rate *rate,
123 const struct rs_tx_column *next_col);
125 struct rs_tx_column {
126 enum rs_column_mode mode;
129 enum rs_column next_columns[MAX_NEXT_COLUMNS];
130 allow_column_func_t checks[MAX_COLUMN_CHECKS];
133 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
134 struct rs_rate *rate,
135 const struct rs_tx_column *next_col)
137 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
140 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
141 struct rs_rate *rate,
142 const struct rs_tx_column *next_col)
144 if (!sta->ht_cap.ht_supported)
147 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
150 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
153 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
156 if (mvm->nvm_data->sku_cap_mimo_disabled)
162 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
163 struct rs_rate *rate,
164 const struct rs_tx_column *next_col)
166 if (!sta->ht_cap.ht_supported)
172 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
173 struct rs_rate *rate,
174 const struct rs_tx_column *next_col)
176 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
177 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
179 if (is_ht20(rate) && (ht_cap->cap &
180 IEEE80211_HT_CAP_SGI_20))
182 if (is_ht40(rate) && (ht_cap->cap &
183 IEEE80211_HT_CAP_SGI_40))
185 if (is_ht80(rate) && (vht_cap->cap &
186 IEEE80211_VHT_CAP_SHORT_GI_80))
188 if (is_ht160(rate) && (vht_cap->cap &
189 IEEE80211_VHT_CAP_SHORT_GI_160))
195 static const struct rs_tx_column rs_tx_columns[] = {
196 [RS_COLUMN_LEGACY_ANT_A] = {
200 RS_COLUMN_LEGACY_ANT_B,
201 RS_COLUMN_SISO_ANT_A,
212 [RS_COLUMN_LEGACY_ANT_B] = {
216 RS_COLUMN_LEGACY_ANT_A,
217 RS_COLUMN_SISO_ANT_B,
228 [RS_COLUMN_SISO_ANT_A] = {
232 RS_COLUMN_SISO_ANT_B,
234 RS_COLUMN_SISO_ANT_A_SGI,
235 RS_COLUMN_LEGACY_ANT_A,
236 RS_COLUMN_LEGACY_ANT_B,
245 [RS_COLUMN_SISO_ANT_B] = {
249 RS_COLUMN_SISO_ANT_A,
251 RS_COLUMN_SISO_ANT_B_SGI,
252 RS_COLUMN_LEGACY_ANT_A,
253 RS_COLUMN_LEGACY_ANT_B,
262 [RS_COLUMN_SISO_ANT_A_SGI] = {
267 RS_COLUMN_SISO_ANT_B_SGI,
269 RS_COLUMN_SISO_ANT_A,
270 RS_COLUMN_LEGACY_ANT_A,
271 RS_COLUMN_LEGACY_ANT_B,
281 [RS_COLUMN_SISO_ANT_B_SGI] = {
286 RS_COLUMN_SISO_ANT_A_SGI,
288 RS_COLUMN_SISO_ANT_B,
289 RS_COLUMN_LEGACY_ANT_A,
290 RS_COLUMN_LEGACY_ANT_B,
300 [RS_COLUMN_MIMO2] = {
304 RS_COLUMN_SISO_ANT_A,
306 RS_COLUMN_LEGACY_ANT_A,
307 RS_COLUMN_LEGACY_ANT_B,
316 [RS_COLUMN_MIMO2_SGI] = {
321 RS_COLUMN_SISO_ANT_A_SGI,
323 RS_COLUMN_LEGACY_ANT_A,
324 RS_COLUMN_LEGACY_ANT_B,
336 static inline u8 rs_extract_rate(u32 rate_n_flags)
338 /* also works for HT because bits 7:6 are zero there */
339 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
342 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
346 if (rate_n_flags & RATE_MCS_HT_MSK) {
347 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
348 idx += IWL_RATE_MCS_0_INDEX;
350 /* skip 9M not supported in HT*/
351 if (idx >= IWL_RATE_9M_INDEX)
353 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
355 } else if (rate_n_flags & RATE_MCS_VHT_MSK ||
356 rate_n_flags & RATE_MCS_HE_MSK) {
357 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
358 idx += IWL_RATE_MCS_0_INDEX;
360 /* skip 9M not supported in VHT*/
361 if (idx >= IWL_RATE_9M_INDEX)
363 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
365 if ((rate_n_flags & RATE_MCS_HE_MSK) &&
366 (idx <= IWL_LAST_HE_RATE))
369 /* legacy rate format, search for match in table */
371 u8 legacy_rate = rs_extract_rate(rate_n_flags);
372 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
373 if (iwl_rates[idx].plcp == legacy_rate)
377 return IWL_RATE_INVALID;
380 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
381 struct ieee80211_sta *sta,
382 struct iwl_lq_sta *lq_sta,
384 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
385 struct ieee80211_sta *sta,
386 struct iwl_lq_sta *lq_sta,
387 const struct rs_rate *initial_rate);
388 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
391 * The following tables contain the expected throughput metrics for all rates
393 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
395 * where invalid entries are zeros.
397 * CCK rates are only valid in legacy table and will only be used in G
401 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
402 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
405 /* Expected TpT tables. 4 indexes:
406 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
408 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
409 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
410 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
411 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
412 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
415 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
416 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
417 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
418 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
419 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
422 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
423 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
424 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
425 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
426 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
429 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
430 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
431 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
432 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
433 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
436 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
437 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
438 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
439 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
440 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
443 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
444 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
445 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
446 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
447 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
450 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
451 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
452 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
453 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
454 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
457 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
458 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
459 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
460 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
461 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
465 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
474 { "24", "16QAM 1/2"},
475 { "36", "16QAM 3/4"},
476 { "48", "64QAM 2/3"},
477 { "54", "64QAM 3/4"},
478 { "60", "64QAM 5/6"},
481 #define MCS_INDEX_PER_STREAM (8)
483 static const char *rs_pretty_ant(u8 ant)
485 static const char * const ant_name[] = {
499 return ant_name[ant];
502 static const char *rs_pretty_lq_type(enum iwl_table_type type)
504 static const char * const lq_types[] = {
506 [LQ_LEGACY_A] = "LEGACY_A",
507 [LQ_LEGACY_G] = "LEGACY_G",
508 [LQ_HT_SISO] = "HT SISO",
509 [LQ_HT_MIMO2] = "HT MIMO",
510 [LQ_VHT_SISO] = "VHT SISO",
511 [LQ_VHT_MIMO2] = "VHT MIMO",
512 [LQ_HE_SISO] = "HE SISO",
513 [LQ_HE_MIMO2] = "HE MIMO",
516 if (type < LQ_NONE || type >= LQ_MAX)
519 return lq_types[type];
522 static char *rs_pretty_rate(const struct rs_rate *rate)
525 static const char * const legacy_rates[] = {
526 [IWL_RATE_1M_INDEX] = "1M",
527 [IWL_RATE_2M_INDEX] = "2M",
528 [IWL_RATE_5M_INDEX] = "5.5M",
529 [IWL_RATE_11M_INDEX] = "11M",
530 [IWL_RATE_6M_INDEX] = "6M",
531 [IWL_RATE_9M_INDEX] = "9M",
532 [IWL_RATE_12M_INDEX] = "12M",
533 [IWL_RATE_18M_INDEX] = "18M",
534 [IWL_RATE_24M_INDEX] = "24M",
535 [IWL_RATE_36M_INDEX] = "36M",
536 [IWL_RATE_48M_INDEX] = "48M",
537 [IWL_RATE_54M_INDEX] = "54M",
539 static const char *const ht_vht_rates[] = {
540 [IWL_RATE_MCS_0_INDEX] = "MCS0",
541 [IWL_RATE_MCS_1_INDEX] = "MCS1",
542 [IWL_RATE_MCS_2_INDEX] = "MCS2",
543 [IWL_RATE_MCS_3_INDEX] = "MCS3",
544 [IWL_RATE_MCS_4_INDEX] = "MCS4",
545 [IWL_RATE_MCS_5_INDEX] = "MCS5",
546 [IWL_RATE_MCS_6_INDEX] = "MCS6",
547 [IWL_RATE_MCS_7_INDEX] = "MCS7",
548 [IWL_RATE_MCS_8_INDEX] = "MCS8",
549 [IWL_RATE_MCS_9_INDEX] = "MCS9",
551 const char *rate_str;
553 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
554 rate_str = legacy_rates[rate->index];
555 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
556 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
557 (rate->index <= IWL_RATE_MCS_9_INDEX))
558 rate_str = ht_vht_rates[rate->index];
560 rate_str = "BAD_RATE";
562 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
563 rs_pretty_ant(rate->ant), rate_str);
567 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
571 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
572 prefix, rs_pretty_rate(rate), rate->bw,
573 rate->sgi, rate->ldpc, rate->stbc);
576 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
579 window->success_counter = 0;
580 window->success_ratio = IWL_INVALID_VALUE;
582 window->average_tpt = IWL_INVALID_VALUE;
585 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
586 struct iwl_scale_tbl_info *tbl)
590 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
591 for (i = 0; i < IWL_RATE_COUNT; i++)
592 rs_rate_scale_clear_window(&tbl->win[i]);
594 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
595 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
598 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
600 return (ant_type & valid_antenna) == ant_type;
603 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
604 struct iwl_lq_sta *lq_data, u8 tid,
605 struct ieee80211_sta *sta)
609 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
612 /* start BA session until the peer sends del BA */
613 ret = ieee80211_start_tx_ba_session(sta, tid, 0);
614 if (ret == -EAGAIN) {
616 * driver and mac80211 is out of sync
617 * this might be cause by reloading firmware
618 * stop the tx ba session here
620 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
622 ieee80211_stop_tx_ba_session(sta, tid);
627 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
628 u8 tid, struct iwl_lq_sta *lq_sta,
629 struct ieee80211_sta *sta)
631 struct iwl_mvm_tid_data *tid_data;
634 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
635 * when the frame is not QoS
637 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
638 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
639 tid, IWL_MAX_TID_COUNT);
641 } else if (tid == IWL_MAX_TID_COUNT) {
645 tid_data = &mvmsta->tid_data[tid];
646 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
647 tid_data->state == IWL_AGG_OFF &&
648 (lq_sta->tx_agg_tid_en & BIT(tid)) &&
649 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
650 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
651 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
652 tid_data->state = IWL_AGG_QUEUED;
656 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
658 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
659 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
660 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
664 * Static function to get the expected throughput from an iwl_scale_tbl_info
665 * that wraps a NULL pointer check
667 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
669 if (tbl->expected_tpt)
670 return tbl->expected_tpt[rs_index];
675 * rs_collect_tx_data - Update the success/failure sliding window
677 * We keep a sliding window of the last 62 packets transmitted
678 * at this rate. window->data contains the bitmask of successful
681 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
682 struct iwl_scale_tbl_info *tbl,
683 int scale_index, int attempts, int successes,
684 struct iwl_rate_scale_data *window)
686 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
689 /* Get expected throughput */
690 tpt = get_expected_tpt(tbl, scale_index);
693 * Keep track of only the latest 62 tx frame attempts in this rate's
694 * history window; anything older isn't really relevant any more.
695 * If we have filled up the sliding window, drop the oldest attempt;
696 * if the oldest attempt (highest bit in bitmap) shows "success",
697 * subtract "1" from the success counter (this is the main reason
698 * we keep these bitmaps!).
700 while (attempts > 0) {
701 if (window->counter >= IWL_RATE_MAX_WINDOW) {
702 /* remove earliest */
703 window->counter = IWL_RATE_MAX_WINDOW - 1;
705 if (window->data & mask) {
706 window->data &= ~mask;
707 window->success_counter--;
711 /* Increment frames-attempted counter */
714 /* Shift bitmap by one frame to throw away oldest history */
717 /* Mark the most recent #successes attempts as successful */
719 window->success_counter++;
727 /* Calculate current success ratio, avoid divide-by-0! */
728 if (window->counter > 0)
729 window->success_ratio = 128 * (100 * window->success_counter)
732 window->success_ratio = IWL_INVALID_VALUE;
734 fail_count = window->counter - window->success_counter;
736 /* Calculate average throughput, if we have enough history. */
737 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
738 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
739 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
741 window->average_tpt = IWL_INVALID_VALUE;
746 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
747 struct iwl_lq_sta *lq_sta,
748 struct iwl_scale_tbl_info *tbl,
749 int scale_index, int attempts, int successes,
752 struct iwl_rate_scale_data *window = NULL;
754 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
757 window = &tbl->tpc_win[reduced_txp];
758 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
762 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
763 struct iwl_mvm_sta *mvmsta,
764 u8 tid, int successes)
766 struct iwl_mvm_tid_data *tid_data;
768 if (tid >= IWL_MAX_TID_COUNT)
771 tid_data = &mvmsta->tid_data[tid];
774 * Measure if there're enough successful transmits per second.
775 * These statistics are used only to decide if we can start a
776 * BA session, so it should be updated only when A-MPDU is
779 if (tid_data->state != IWL_AGG_OFF)
782 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
783 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
784 tid_data->tx_count_last = tid_data->tx_count;
785 tid_data->tx_count = 0;
786 tid_data->tpt_meas_start = jiffies;
788 tid_data->tx_count += successes;
792 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
793 struct iwl_mvm_sta *mvmsta, u8 tid,
794 struct iwl_scale_tbl_info *tbl,
795 int scale_index, int attempts, int successes)
797 struct iwl_rate_scale_data *window = NULL;
799 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
802 if (tbl->column != RS_COLUMN_INVALID) {
803 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
805 pers->tx_stats[tbl->column][scale_index].total += attempts;
806 pers->tx_stats[tbl->column][scale_index].success += successes;
809 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
811 /* Select window for current tx bit rate */
812 window = &(tbl->win[scale_index]);
813 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
817 /* Convert rs_rate object into ucode rate bitmask */
818 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
819 struct rs_rate *rate)
822 int index = rate->index;
824 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
825 RATE_MCS_ANT_ABC_MSK);
827 if (is_legacy(rate)) {
828 ucode_rate |= iwl_rates[index].plcp;
829 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
830 ucode_rate |= RATE_MCS_CCK_MSK;
835 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
836 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
837 index = IWL_LAST_HT_RATE;
839 ucode_rate |= RATE_MCS_HT_MSK;
841 if (is_ht_siso(rate))
842 ucode_rate |= iwl_rates[index].plcp_ht_siso;
843 else if (is_ht_mimo2(rate))
844 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
847 } else if (is_vht(rate)) {
848 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
849 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
850 index = IWL_LAST_VHT_RATE;
852 ucode_rate |= RATE_MCS_VHT_MSK;
853 if (is_vht_siso(rate))
854 ucode_rate |= iwl_rates[index].plcp_vht_siso;
855 else if (is_vht_mimo2(rate))
856 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
861 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
864 if (is_siso(rate) && rate->stbc) {
865 /* To enable STBC we need to set both a flag and ANT_AB */
866 ucode_rate |= RATE_MCS_ANT_AB_MSK;
867 ucode_rate |= RATE_MCS_STBC_MSK;
870 ucode_rate |= rate->bw;
872 ucode_rate |= RATE_MCS_SGI_MSK;
874 ucode_rate |= RATE_MCS_LDPC_MSK;
879 /* Convert a ucode rate into an rs_rate object */
880 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
881 enum nl80211_band band,
882 struct rs_rate *rate)
884 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
885 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
888 memset(rate, 0, sizeof(*rate));
889 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
891 if (rate->index == IWL_RATE_INVALID)
894 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
897 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
898 !(ucode_rate & RATE_MCS_VHT_MSK) &&
899 !(ucode_rate & RATE_MCS_HE_MSK)) {
900 if (num_of_ant == 1) {
901 if (band == NL80211_BAND_5GHZ)
902 rate->type = LQ_LEGACY_A;
904 rate->type = LQ_LEGACY_G;
911 if (ucode_rate & RATE_MCS_SGI_MSK)
913 if (ucode_rate & RATE_MCS_LDPC_MSK)
915 if (ucode_rate & RATE_MCS_STBC_MSK)
917 if (ucode_rate & RATE_MCS_BF_MSK)
920 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
922 if (ucode_rate & RATE_MCS_HT_MSK) {
923 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
924 RATE_HT_MCS_NSS_POS) + 1;
927 rate->type = LQ_HT_SISO;
928 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
930 rate->stbc, rate->bfer);
931 } else if (nss == 2) {
932 rate->type = LQ_HT_MIMO2;
933 WARN_ON_ONCE(num_of_ant != 2);
937 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
938 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
939 RATE_VHT_MCS_NSS_POS) + 1;
942 rate->type = LQ_VHT_SISO;
943 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
945 rate->stbc, rate->bfer);
946 } else if (nss == 2) {
947 rate->type = LQ_VHT_MIMO2;
948 WARN_ON_ONCE(num_of_ant != 2);
952 } else if (ucode_rate & RATE_MCS_HE_MSK) {
953 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
954 RATE_VHT_MCS_NSS_POS) + 1;
957 rate->type = LQ_HE_SISO;
958 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
959 "stbc %d bfer %d", rate->stbc, rate->bfer);
960 } else if (nss == 2) {
961 rate->type = LQ_HE_MIMO2;
962 WARN_ON_ONCE(num_of_ant != 2);
968 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
969 !is_he(rate) && !is_vht(rate));
974 /* switch to another antenna/antennas and return 1 */
975 /* if no other valid antenna found, return 0 */
976 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
980 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C))
983 if (!rs_is_valid_ant(valid_ant, rate->ant))
986 new_ant_type = ant_toggle_lookup[rate->ant];
988 while ((new_ant_type != rate->ant) &&
989 !rs_is_valid_ant(valid_ant, new_ant_type))
990 new_ant_type = ant_toggle_lookup[new_ant_type];
992 if (new_ant_type == rate->ant)
995 rate->ant = new_ant_type;
1000 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
1001 struct rs_rate *rate)
1003 if (is_legacy(rate))
1004 return lq_sta->active_legacy_rate;
1005 else if (is_siso(rate))
1006 return lq_sta->active_siso_rate;
1007 else if (is_mimo2(rate))
1008 return lq_sta->active_mimo2_rate;
1014 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1017 u8 high = IWL_RATE_INVALID;
1018 u8 low = IWL_RATE_INVALID;
1020 /* 802.11A or ht walks to the next literal adjacent rate in
1022 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1026 /* Find the previous rate that is in the rate mask */
1030 for (; i >= 0; i--, mask >>= 1) {
1031 if (rate_mask & mask) {
1037 /* Find the next rate that is in the rate mask */
1039 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1040 if (rate_mask & mask) {
1046 return (high << 8) | low;
1050 while (low != IWL_RATE_INVALID) {
1051 low = iwl_rates[low].prev_rs;
1052 if (low == IWL_RATE_INVALID)
1054 if (rate_mask & (1 << low))
1059 while (high != IWL_RATE_INVALID) {
1060 high = iwl_rates[high].next_rs;
1061 if (high == IWL_RATE_INVALID)
1063 if (rate_mask & (1 << high))
1067 return (high << 8) | low;
1070 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1071 struct rs_rate *rate)
1073 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1076 /* Get the next supported lower rate in the current column.
1077 * Return true if bottom rate in the current column was reached
1079 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1080 struct rs_rate *rate)
1085 struct iwl_mvm *mvm = lq_sta->pers.drv;
1087 rate_mask = rs_get_supported_rates(lq_sta, rate);
1088 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1090 low = high_low & 0xff;
1092 /* Bottom rate of column reached */
1093 if (low == IWL_RATE_INVALID)
1100 /* Get the next rate to use following a column downgrade */
1101 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1102 struct rs_rate *rate)
1104 struct iwl_mvm *mvm = lq_sta->pers.drv;
1106 if (is_legacy(rate)) {
1107 /* No column to downgrade from Legacy */
1109 } else if (is_siso(rate)) {
1110 /* Downgrade to Legacy if we were in SISO */
1111 if (lq_sta->band == NL80211_BAND_5GHZ)
1112 rate->type = LQ_LEGACY_A;
1114 rate->type = LQ_LEGACY_G;
1116 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1118 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1119 rate->index > IWL_RATE_MCS_9_INDEX);
1121 rate->index = rs_ht_to_legacy[rate->index];
1124 /* Downgrade to SISO with same MCS if in MIMO */
1125 rate->type = is_vht_mimo2(rate) ?
1126 LQ_VHT_SISO : LQ_HT_SISO;
1129 if (num_of_ant(rate->ant) > 1)
1130 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1132 /* Relevant in both switching to SISO or Legacy */
1135 if (!rs_rate_supported(lq_sta, rate))
1136 rs_get_lower_rate_in_column(lq_sta, rate);
1139 /* Check if both rates share the same column */
1140 static inline bool rs_rate_column_match(struct rs_rate *a,
1145 if (a->stbc || a->bfer)
1146 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1148 ant_match = (a->ant == b->ant);
1150 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1154 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1156 if (is_legacy(rate)) {
1157 if (rate->ant == ANT_A)
1158 return RS_COLUMN_LEGACY_ANT_A;
1160 if (rate->ant == ANT_B)
1161 return RS_COLUMN_LEGACY_ANT_B;
1166 if (is_siso(rate)) {
1167 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1168 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1169 RS_COLUMN_SISO_ANT_A;
1171 if (rate->ant == ANT_B)
1172 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1173 RS_COLUMN_SISO_ANT_B;
1179 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1182 return RS_COLUMN_INVALID;
1185 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1187 u8 tid = IWL_MAX_TID_COUNT;
1189 if (ieee80211_is_data_qos(hdr->frame_control)) {
1190 u8 *qc = ieee80211_get_qos_ctl(hdr);
1194 if (unlikely(tid > IWL_MAX_TID_COUNT))
1195 tid = IWL_MAX_TID_COUNT;
1200 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1201 int tid, struct ieee80211_tx_info *info, bool ndp)
1206 struct iwl_lq_cmd *table;
1208 struct rs_rate lq_rate, tx_resp_rate;
1209 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1210 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1211 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1212 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1213 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1214 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1215 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
1217 /* Treat uninitialized rate scaling data same as non-existing. */
1219 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1221 } else if (!lq_sta->pers.drv) {
1222 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1226 /* This packet was aggregated but doesn't carry status info */
1227 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1228 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1231 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
1237 #ifdef CONFIG_MAC80211_DEBUGFS
1238 /* Disable last tx check if we are debugging with fixed rate but
1239 * update tx stats */
1240 if (lq_sta->pers.dbg_fixed_rate) {
1241 int index = tx_resp_rate.index;
1242 enum rs_column column;
1243 int attempts, success;
1245 column = rs_get_column_from_rate(&tx_resp_rate);
1246 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1247 "Can't map rate 0x%x to column",
1251 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1252 attempts = info->status.ampdu_len;
1253 success = info->status.ampdu_ack_len;
1255 attempts = info->status.rates[0].count;
1256 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1259 lq_sta->pers.tx_stats[column][index].total += attempts;
1260 lq_sta->pers.tx_stats[column][index].success += success;
1262 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1263 tx_resp_hwrate, success, attempts);
1268 if (time_after(jiffies,
1269 (unsigned long)(lq_sta->last_tx +
1270 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1271 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1272 iwl_mvm_rs_rate_init(mvm, sta, info->band, true);
1275 lq_sta->last_tx = jiffies;
1277 /* Ignore this Tx frame response if its initial rate doesn't match
1278 * that of latest Link Quality command. There may be stragglers
1279 * from a previous Link Quality command, but we're no longer interested
1280 * in those; they're either from the "active" mode while we're trying
1281 * to check "search" mode, or a prior "search" mode after we've moved
1282 * to a new "search" mode (which might become the new "active" mode).
1284 table = &lq_sta->lq;
1285 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1286 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
1291 /* Here we actually compare this rate to the latest LQ command */
1292 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1294 "tx resp color 0x%x does not match 0x%x\n",
1295 lq_color, LQ_FLAG_COLOR_GET(table->flags));
1298 * Since rates mis-match, the last LQ command may have failed.
1299 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1302 lq_sta->missed_rate_counter++;
1303 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1304 lq_sta->missed_rate_counter = 0;
1306 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1308 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1310 /* Regardless, ignore this status info for outdated rate */
1313 /* Rate did match, so reset the missed_rate_counter */
1314 lq_sta->missed_rate_counter = 0;
1316 if (!lq_sta->search_better_tbl) {
1317 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1318 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1320 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1321 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1324 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1326 "Neither active nor search matches tx rate\n");
1327 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1328 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1329 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1330 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1331 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1334 * no matching table found, let's by-pass the data collection
1335 * and continue to perform rate scale to find the rate table
1337 rs_stay_in_table(lq_sta, true);
1342 * Updating the frame history depends on whether packets were
1345 * For aggregation, all packets were transmitted at the same rate, the
1346 * first index into rate scale table.
1348 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1349 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1350 info->status.ampdu_len,
1351 info->status.ampdu_ack_len,
1354 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1355 * it as a single frame loss as we don't want the success ratio
1356 * to dip too quickly because a BA wasn't received.
1357 * For TPC, there's no need for this optimisation since we want
1358 * to recover very quickly from a bad power reduction and,
1359 * therefore we'd like the success ratio to get an immediate hit
1360 * when failing to get a BA, so we'd switch back to a lower or
1361 * zero power reduction. When FW transmits agg with a rate
1362 * different from the initial rate, it will not use reduced txp
1363 * and will send BA notification twice (one empty with reduced
1364 * txp equal to the value from LQ and one with reduced txp 0).
1365 * We need to update counters for each txp level accordingly.
1367 if (info->status.ampdu_ack_len == 0)
1368 info->status.ampdu_len = 1;
1370 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index,
1371 info->status.ampdu_len,
1372 info->status.ampdu_ack_len);
1374 /* Update success/fail counts if not searching for new mode */
1375 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1376 lq_sta->total_success += info->status.ampdu_ack_len;
1377 lq_sta->total_failed += (info->status.ampdu_len -
1378 info->status.ampdu_ack_len);
1381 /* For legacy, update frame history with for each Tx retry. */
1382 retries = info->status.rates[0].count - 1;
1383 /* HW doesn't send more than 15 retries */
1384 retries = min(retries, 15);
1386 /* The last transmission may have been successful */
1387 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1388 /* Collect data for each rate used during failed TX attempts */
1389 for (i = 0; i <= retries; ++i) {
1390 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1391 if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
1398 * Only collect stats if retried rate is in the same RS
1399 * table as active/search.
1401 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1403 else if (rs_rate_column_match(&lq_rate,
1405 tmp_tbl = other_tbl;
1409 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1410 tx_resp_rate.index, 1,
1411 i < retries ? 0 : legacy_success,
1413 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
1414 tx_resp_rate.index, 1,
1415 i < retries ? 0 : legacy_success);
1418 /* Update success/fail counts if not searching for new mode */
1419 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1420 lq_sta->total_success += legacy_success;
1421 lq_sta->total_failed += retries + (1 - legacy_success);
1424 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1425 lq_sta->last_rate_n_flags = lq_hwrate;
1426 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1428 /* See if there's a better rate or modulation mode to try. */
1429 if (sta->supp_rates[info->band])
1430 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1434 * mac80211 sends us Tx status
1436 static void rs_drv_mac80211_tx_status(void *mvm_r,
1437 struct ieee80211_supported_band *sband,
1438 struct ieee80211_sta *sta, void *priv_sta,
1439 struct sk_buff *skb)
1441 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1442 struct iwl_op_mode *op_mode = mvm_r;
1443 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1444 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1446 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1449 if (!ieee80211_is_data(hdr->frame_control) ||
1450 info->flags & IEEE80211_TX_CTL_NO_ACK)
1453 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1454 ieee80211_is_qos_nullfunc(hdr->frame_control));
1458 * Begin a period of staying with a selected modulation mode.
1459 * Set "stay_in_tbl" flag to prevent any mode switches.
1460 * Set frame tx success limits according to legacy vs. high-throughput,
1461 * and reset overall (spanning all rates) tx success history statistics.
1462 * These control how long we stay using same modulation mode before
1463 * searching for a new mode.
1465 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1466 struct iwl_lq_sta *lq_sta)
1468 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1469 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1471 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1472 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1473 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1475 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1476 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1477 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1479 lq_sta->table_count = 0;
1480 lq_sta->total_failed = 0;
1481 lq_sta->total_success = 0;
1482 lq_sta->flush_timer = jiffies;
1483 lq_sta->visited_columns = 0;
1486 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1489 return find_last_bit(&rate_mask, BITS_PER_LONG);
1490 return IWL_RATE_INVALID;
1493 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1494 const struct rs_tx_column *column)
1496 switch (column->mode) {
1498 return lq_sta->max_legacy_rate_idx;
1500 return lq_sta->max_siso_rate_idx;
1502 return lq_sta->max_mimo2_rate_idx;
1507 return lq_sta->max_legacy_rate_idx;
1510 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1511 const struct rs_tx_column *column,
1514 /* Used to choose among HT tables */
1515 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1517 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1518 column->mode != RS_SISO &&
1519 column->mode != RS_MIMO2))
1520 return expected_tpt_legacy;
1522 /* Legacy rates have only one table */
1523 if (column->mode == RS_LEGACY)
1524 return expected_tpt_legacy;
1526 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1527 /* Choose among many HT tables depending on number of streams
1528 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1530 if (column->mode == RS_SISO) {
1532 case RATE_MCS_CHAN_WIDTH_20:
1533 ht_tbl_pointer = expected_tpt_siso_20MHz;
1535 case RATE_MCS_CHAN_WIDTH_40:
1536 ht_tbl_pointer = expected_tpt_siso_40MHz;
1538 case RATE_MCS_CHAN_WIDTH_80:
1539 ht_tbl_pointer = expected_tpt_siso_80MHz;
1541 case RATE_MCS_CHAN_WIDTH_160:
1542 ht_tbl_pointer = expected_tpt_siso_160MHz;
1547 } else if (column->mode == RS_MIMO2) {
1549 case RATE_MCS_CHAN_WIDTH_20:
1550 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1552 case RATE_MCS_CHAN_WIDTH_40:
1553 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1555 case RATE_MCS_CHAN_WIDTH_80:
1556 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1558 case RATE_MCS_CHAN_WIDTH_160:
1559 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1568 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1569 return ht_tbl_pointer[0];
1570 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1571 return ht_tbl_pointer[1];
1572 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1573 return ht_tbl_pointer[2];
1575 return ht_tbl_pointer[3];
1578 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1579 struct iwl_scale_tbl_info *tbl)
1581 struct rs_rate *rate = &tbl->rate;
1582 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1584 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1587 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1588 struct iwl_lq_sta *lq_sta,
1589 struct iwl_scale_tbl_info *tbl, /* "search" */
1590 unsigned long rate_mask, s8 index)
1592 struct iwl_scale_tbl_info *active_tbl =
1593 &(lq_sta->lq_info[lq_sta->active_tbl]);
1594 s32 success_ratio = active_tbl->win[index].success_ratio;
1595 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1596 const u16 *tpt_tbl = tbl->expected_tpt;
1601 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1602 target_tpt = 100 * expected_current_tpt;
1604 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1605 success_ratio, target_tpt);
1607 target_tpt = lq_sta->last_tpt;
1609 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1610 success_ratio, target_tpt);
1613 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1615 while (rate_idx != IWL_RATE_INVALID) {
1616 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1619 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1622 rate_idx = (high_low >> 8) & 0xff;
1625 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1626 rate_idx, target_tpt,
1627 rate_idx != IWL_RATE_INVALID ?
1628 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1633 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1635 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap;
1636 struct ieee80211_vht_cap vht_cap = {
1637 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1638 .supp_mcs = sta_vht_cap->vht_mcs,
1641 switch (sta->bandwidth) {
1642 case IEEE80211_STA_RX_BW_160:
1644 * Don't use 160 MHz if VHT extended NSS support
1645 * says we cannot use 2 streams, we don't want to
1647 * We only check MCS 0 - they will support that if
1648 * we got here at all and we don't care which MCS,
1649 * we want to determine a more global state.
1651 if (ieee80211_get_vht_max_nss(&vht_cap,
1652 IEEE80211_VHT_CHANWIDTH_160MHZ,
1653 0, true) < sta->rx_nss)
1654 return RATE_MCS_CHAN_WIDTH_80;
1655 return RATE_MCS_CHAN_WIDTH_160;
1656 case IEEE80211_STA_RX_BW_80:
1657 return RATE_MCS_CHAN_WIDTH_80;
1658 case IEEE80211_STA_RX_BW_40:
1659 return RATE_MCS_CHAN_WIDTH_40;
1660 case IEEE80211_STA_RX_BW_20:
1662 return RATE_MCS_CHAN_WIDTH_20;
1667 * Check whether we should continue using same modulation mode, or
1668 * begin search for a new mode, based on:
1669 * 1) # tx successes or failures while using this mode
1670 * 2) # times calling this function
1671 * 3) elapsed time in this mode (not used, for now)
1673 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1675 struct iwl_scale_tbl_info *tbl;
1677 int flush_interval_passed = 0;
1678 struct iwl_mvm *mvm;
1680 mvm = lq_sta->pers.drv;
1681 active_tbl = lq_sta->active_tbl;
1683 tbl = &(lq_sta->lq_info[active_tbl]);
1685 /* If we've been disallowing search, see if we should now allow it */
1686 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1687 /* Elapsed time using current modulation mode */
1688 if (lq_sta->flush_timer)
1689 flush_interval_passed =
1691 (unsigned long)(lq_sta->flush_timer +
1692 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1695 * Check if we should allow search for new modulation mode.
1696 * If many frames have failed or succeeded, or we've used
1697 * this same modulation for a long time, allow search, and
1698 * reset history stats that keep track of whether we should
1699 * allow a new search. Also (below) reset all bitmaps and
1700 * stats in active history.
1703 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1704 (lq_sta->total_success > lq_sta->max_success_limit) ||
1705 ((!lq_sta->search_better_tbl) &&
1706 (lq_sta->flush_timer) && (flush_interval_passed))) {
1708 "LQ: stay is expired %d %d %d\n",
1709 lq_sta->total_failed,
1710 lq_sta->total_success,
1711 flush_interval_passed);
1713 /* Allow search for new mode */
1714 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1716 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1717 lq_sta->total_failed = 0;
1718 lq_sta->total_success = 0;
1719 lq_sta->flush_timer = 0;
1720 /* mark the current column as visited */
1721 lq_sta->visited_columns = BIT(tbl->column);
1723 * Else if we've used this modulation mode enough repetitions
1724 * (regardless of elapsed time or success/failure), reset
1725 * history bitmaps and rate-specific stats for all rates in
1729 lq_sta->table_count++;
1730 if (lq_sta->table_count >=
1731 lq_sta->table_count_limit) {
1732 lq_sta->table_count = 0;
1735 "LQ: stay in table clear win\n");
1736 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1740 /* If transitioning to allow "search", reset all history
1741 * bitmaps and stats in active table (this will become the new
1742 * "search" table). */
1743 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1744 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1749 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1750 struct iwl_scale_tbl_info *tbl,
1751 enum rs_action scale_action)
1753 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1757 * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1758 * or 0, since there is no per-TID alg.
1760 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1761 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1762 scale_action == RS_ACTION_DOWNSCALE)
1763 mvmsta->amsdu_enabled = 0;
1765 mvmsta->amsdu_enabled = 0xFFFF;
1767 if (mvmsta->vif->bss_conf.he_support &&
1768 !iwlwifi_mod_params.disable_11ax)
1769 mvmsta->max_amsdu_len = sta->max_amsdu_len;
1771 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500);
1773 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len;
1775 for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1776 if (mvmsta->amsdu_enabled)
1777 sta->max_tid_amsdu_len[i] =
1778 iwl_mvm_max_amsdu_size(mvm, sta, i);
1781 * Not so elegant, but this will effectively
1782 * prevent AMSDU on this TID
1784 sta->max_tid_amsdu_len[i] = 1;
1789 * setup rate table in uCode
1791 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1792 struct ieee80211_sta *sta,
1793 struct iwl_lq_sta *lq_sta,
1794 struct iwl_scale_tbl_info *tbl)
1796 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1797 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1800 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1801 struct ieee80211_sta *sta,
1802 struct iwl_lq_sta *lq_sta,
1803 struct iwl_scale_tbl_info *tbl,
1804 enum rs_action scale_action)
1806 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1809 if (!is_vht_siso(&tbl->rate))
1812 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1813 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1814 (scale_action == RS_ACTION_DOWNSCALE)) {
1815 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1816 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1817 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1821 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1822 * sustainable, i.e. we're past the test window. We can't go back
1823 * if MCS5 is just tested as this will happen always after switching
1824 * to 20Mhz MCS4 because the rate stats are cleared.
1826 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1827 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1828 (scale_action == RS_ACTION_STAY)) ||
1829 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1830 (scale_action == RS_ACTION_UPSCALE)))) {
1831 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1832 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1833 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1840 rs_set_expected_tpt_table(lq_sta, tbl);
1841 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1845 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1846 struct iwl_lq_sta *lq_sta,
1847 struct ieee80211_sta *sta,
1848 struct iwl_scale_tbl_info *tbl)
1851 enum rs_column next_col_id;
1852 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1853 const struct rs_tx_column *next_col;
1854 allow_column_func_t allow_func;
1855 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1856 const u16 *expected_tpt_tbl;
1857 u16 tpt, max_expected_tpt;
1859 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1860 next_col_id = curr_col->next_columns[i];
1862 if (next_col_id == RS_COLUMN_INVALID)
1865 if (lq_sta->visited_columns & BIT(next_col_id)) {
1866 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1871 next_col = &rs_tx_columns[next_col_id];
1873 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1875 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1876 next_col_id, valid_ants, next_col->ant);
1880 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1881 allow_func = next_col->checks[j];
1882 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1887 if (j != MAX_COLUMN_CHECKS) {
1889 "Skip column %d: not allowed (check %d failed)\n",
1895 tpt = lq_sta->last_tpt / 100;
1896 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1897 rs_bw_from_sta_bw(sta));
1898 if (WARN_ON_ONCE(!expected_tpt_tbl))
1901 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1902 if (max_rate == IWL_RATE_INVALID) {
1904 "Skip column %d: no rate is allowed in this column\n",
1909 max_expected_tpt = expected_tpt_tbl[max_rate];
1910 if (tpt >= max_expected_tpt) {
1912 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1913 next_col_id, max_expected_tpt, tpt);
1918 "Found potential column %d. Max expected %d current %d\n",
1919 next_col_id, max_expected_tpt, tpt);
1923 if (i == MAX_NEXT_COLUMNS)
1924 return RS_COLUMN_INVALID;
1929 static int rs_switch_to_column(struct iwl_mvm *mvm,
1930 struct iwl_lq_sta *lq_sta,
1931 struct ieee80211_sta *sta,
1932 enum rs_column col_id)
1934 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1935 struct iwl_scale_tbl_info *search_tbl =
1936 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1937 struct rs_rate *rate = &search_tbl->rate;
1938 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1939 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1940 unsigned long rate_mask = 0;
1943 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1945 rate->sgi = column->sgi;
1946 rate->ant = column->ant;
1948 if (column->mode == RS_LEGACY) {
1949 if (lq_sta->band == NL80211_BAND_5GHZ)
1950 rate->type = LQ_LEGACY_A;
1952 rate->type = LQ_LEGACY_G;
1954 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1956 rate_mask = lq_sta->active_legacy_rate;
1957 } else if (column->mode == RS_SISO) {
1958 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1959 rate_mask = lq_sta->active_siso_rate;
1960 } else if (column->mode == RS_MIMO2) {
1961 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1962 rate_mask = lq_sta->active_mimo2_rate;
1964 WARN_ONCE(1, "Bad column mode");
1967 if (column->mode != RS_LEGACY) {
1968 rate->bw = rs_bw_from_sta_bw(sta);
1969 rate->ldpc = lq_sta->ldpc;
1972 search_tbl->column = col_id;
1973 rs_set_expected_tpt_table(lq_sta, search_tbl);
1975 lq_sta->visited_columns |= BIT(col_id);
1977 /* Get the best matching rate if we're changing modes. e.g.
1978 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1980 if (curr_column->mode != column->mode) {
1981 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1982 rate_mask, rate->index);
1984 if ((rate_idx == IWL_RATE_INVALID) ||
1985 !(BIT(rate_idx) & rate_mask)) {
1987 "can not switch with index %d"
1989 rate_idx, rate_mask);
1994 rate->index = rate_idx;
1997 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1998 col_id, rate->index);
2003 rate->type = LQ_NONE;
2007 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
2008 struct iwl_scale_tbl_info *tbl,
2009 s32 sr, int low, int high,
2011 int low_tpt, int high_tpt)
2013 enum rs_action action = RS_ACTION_STAY;
2015 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
2016 (current_tpt == 0)) {
2018 "Decrease rate because of low SR\n");
2019 return RS_ACTION_DOWNSCALE;
2022 if ((low_tpt == IWL_INVALID_VALUE) &&
2023 (high_tpt == IWL_INVALID_VALUE) &&
2024 (high != IWL_RATE_INVALID)) {
2026 "No data about high/low rates. Increase rate\n");
2027 return RS_ACTION_UPSCALE;
2030 if ((high_tpt == IWL_INVALID_VALUE) &&
2031 (high != IWL_RATE_INVALID) &&
2032 (low_tpt != IWL_INVALID_VALUE) &&
2033 (low_tpt < current_tpt)) {
2035 "No data about high rate and low rate is worse. Increase rate\n");
2036 return RS_ACTION_UPSCALE;
2039 if ((high_tpt != IWL_INVALID_VALUE) &&
2040 (high_tpt > current_tpt)) {
2042 "Higher rate is better. Increate rate\n");
2043 return RS_ACTION_UPSCALE;
2046 if ((low_tpt != IWL_INVALID_VALUE) &&
2047 (high_tpt != IWL_INVALID_VALUE) &&
2048 (low_tpt < current_tpt) &&
2049 (high_tpt < current_tpt)) {
2051 "Both high and low are worse. Maintain rate\n");
2052 return RS_ACTION_STAY;
2055 if ((low_tpt != IWL_INVALID_VALUE) &&
2056 (low_tpt > current_tpt)) {
2058 "Lower rate is better\n");
2059 action = RS_ACTION_DOWNSCALE;
2063 if ((low_tpt == IWL_INVALID_VALUE) &&
2064 (low != IWL_RATE_INVALID)) {
2066 "No data about lower rate\n");
2067 action = RS_ACTION_DOWNSCALE;
2071 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2074 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2075 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2077 "SR is above NO DECREASE. Avoid downscale\n");
2078 action = RS_ACTION_STAY;
2079 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2081 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2082 action = RS_ACTION_STAY;
2084 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2091 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2092 struct iwl_lq_sta *lq_sta)
2094 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2095 * supports STBC of at least 1*SS
2097 if (!lq_sta->stbc_capable)
2100 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2106 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2107 int *weaker, int *stronger)
2109 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2110 if (*weaker > TPC_MAX_REDUCTION)
2111 *weaker = TPC_INVALID;
2113 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2115 *stronger = TPC_INVALID;
2118 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2119 struct rs_rate *rate, enum nl80211_band band)
2121 int index = rate->index;
2122 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2123 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2126 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2127 cam, sta_ps_disabled);
2129 * allow tpc only if power management is enabled, or bt coex
2130 * activity grade allows it and we are on 2.4Ghz.
2132 if ((cam || sta_ps_disabled) &&
2133 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2136 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2137 if (is_legacy(rate))
2138 return index == IWL_RATE_54M_INDEX;
2140 return index == IWL_RATE_MCS_7_INDEX;
2142 return index == IWL_RATE_MCS_7_INDEX ||
2143 index == IWL_RATE_MCS_8_INDEX ||
2144 index == IWL_RATE_MCS_9_INDEX;
2152 TPC_ACTION_DECREASE,
2153 TPC_ACTION_INCREASE,
2154 TPC_ACTION_NO_RESTIRCTION,
2157 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2158 s32 sr, int weak, int strong,
2160 int weak_tpt, int strong_tpt)
2162 /* stay until we have valid tpt */
2163 if (current_tpt == IWL_INVALID_VALUE) {
2164 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2165 return TPC_ACTION_STAY;
2168 /* Too many failures, increase txp */
2169 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2171 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2172 return TPC_ACTION_NO_RESTIRCTION;
2175 /* try decreasing first if applicable */
2176 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2177 weak != TPC_INVALID) {
2178 if (weak_tpt == IWL_INVALID_VALUE &&
2179 (strong_tpt == IWL_INVALID_VALUE ||
2180 current_tpt >= strong_tpt)) {
2182 "no weak txp measurement. decrease txp\n");
2183 return TPC_ACTION_DECREASE;
2186 if (weak_tpt > current_tpt) {
2188 "lower txp has better tpt. decrease txp\n");
2189 return TPC_ACTION_DECREASE;
2193 /* next, increase if needed */
2194 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2195 strong != TPC_INVALID) {
2196 if (weak_tpt == IWL_INVALID_VALUE &&
2197 strong_tpt != IWL_INVALID_VALUE &&
2198 current_tpt < strong_tpt) {
2200 "higher txp has better tpt. increase txp\n");
2201 return TPC_ACTION_INCREASE;
2204 if (weak_tpt < current_tpt &&
2205 (strong_tpt == IWL_INVALID_VALUE ||
2206 strong_tpt > current_tpt)) {
2208 "lower txp has worse tpt. increase txp\n");
2209 return TPC_ACTION_INCREASE;
2213 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2214 return TPC_ACTION_STAY;
2217 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2218 struct ieee80211_sta *sta,
2219 struct iwl_lq_sta *lq_sta,
2220 struct iwl_scale_tbl_info *tbl)
2222 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2223 struct ieee80211_vif *vif = mvm_sta->vif;
2224 struct ieee80211_chanctx_conf *chanctx_conf;
2225 enum nl80211_band band;
2226 struct iwl_rate_scale_data *window;
2227 struct rs_rate *rate = &tbl->rate;
2228 enum tpc_action action;
2230 u8 cur = lq_sta->lq.reduced_tpc;
2233 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2235 #ifdef CONFIG_MAC80211_DEBUGFS
2236 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2237 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2238 lq_sta->pers.dbg_fixed_txp_reduction);
2239 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2240 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2245 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2246 if (WARN_ON(!chanctx_conf))
2247 band = NUM_NL80211_BANDS;
2249 band = chanctx_conf->def.chan->band;
2252 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2254 "tpc is not allowed. remove txp restrictions\n");
2255 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2256 return cur != TPC_NO_REDUCTION;
2259 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2261 /* Collect measured throughputs for current and adjacent rates */
2262 window = tbl->tpc_win;
2263 sr = window[cur].success_ratio;
2264 current_tpt = window[cur].average_tpt;
2265 if (weak != TPC_INVALID)
2266 weak_tpt = window[weak].average_tpt;
2267 if (strong != TPC_INVALID)
2268 strong_tpt = window[strong].average_tpt;
2271 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2272 cur, current_tpt, sr, weak, strong,
2273 weak_tpt, strong_tpt);
2275 action = rs_get_tpc_action(mvm, sr, weak, strong,
2276 current_tpt, weak_tpt, strong_tpt);
2278 /* override actions if we are on the edge */
2279 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2280 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2281 action = TPC_ACTION_STAY;
2282 } else if (strong == TPC_INVALID &&
2283 (action == TPC_ACTION_INCREASE ||
2284 action == TPC_ACTION_NO_RESTIRCTION)) {
2285 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2286 action = TPC_ACTION_STAY;
2290 case TPC_ACTION_DECREASE:
2291 lq_sta->lq.reduced_tpc = weak;
2293 case TPC_ACTION_INCREASE:
2294 lq_sta->lq.reduced_tpc = strong;
2296 case TPC_ACTION_NO_RESTIRCTION:
2297 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2299 case TPC_ACTION_STAY:
2307 * Do rate scaling and search for new modulation mode.
2309 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2310 struct ieee80211_sta *sta,
2311 struct iwl_lq_sta *lq_sta,
2314 int low = IWL_RATE_INVALID;
2315 int high = IWL_RATE_INVALID;
2317 struct iwl_rate_scale_data *window = NULL;
2318 int current_tpt = IWL_INVALID_VALUE;
2319 int low_tpt = IWL_INVALID_VALUE;
2320 int high_tpt = IWL_INVALID_VALUE;
2322 enum rs_action scale_action = RS_ACTION_STAY;
2325 struct iwl_scale_tbl_info *tbl, *tbl1;
2330 u8 prev_agg = lq_sta->is_agg;
2331 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2332 struct rs_rate *rate;
2334 lq_sta->is_agg = !!mvmsta->agg_tids;
2337 * Select rate-scale / modulation-mode table to work with in
2338 * the rest of this function: "search" if searching for better
2339 * modulation mode, or "active" if doing rate scaling within a mode.
2341 if (!lq_sta->search_better_tbl)
2342 active_tbl = lq_sta->active_tbl;
2344 active_tbl = 1 - lq_sta->active_tbl;
2346 tbl = &(lq_sta->lq_info[active_tbl]);
2349 if (prev_agg != lq_sta->is_agg) {
2351 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2352 prev_agg, lq_sta->is_agg);
2353 rs_set_expected_tpt_table(lq_sta, tbl);
2354 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2357 /* current tx rate */
2358 index = rate->index;
2360 /* rates available for this association, and for modulation mode */
2361 rate_mask = rs_get_supported_rates(lq_sta, rate);
2363 if (!(BIT(index) & rate_mask)) {
2364 IWL_ERR(mvm, "Current Rate is not valid\n");
2365 if (lq_sta->search_better_tbl) {
2366 /* revert to active table if search table is not valid*/
2367 rate->type = LQ_NONE;
2368 lq_sta->search_better_tbl = 0;
2369 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2370 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2375 /* Get expected throughput table and history window for current rate */
2376 if (!tbl->expected_tpt) {
2377 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2381 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2382 window = &(tbl->win[index]);
2385 * If there is not enough history to calculate actual average
2386 * throughput, keep analyzing results of more tx frames, without
2387 * changing rate or mode (bypass most of the rest of this function).
2388 * Set up new rate table in uCode only if old rate is not supported
2389 * in current association (use new rate found above).
2391 fail_count = window->counter - window->success_counter;
2392 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2393 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2395 "%s: Test Window: succ %d total %d\n",
2396 rs_pretty_rate(rate),
2397 window->success_counter, window->counter);
2399 /* Can't calculate this yet; not enough history */
2400 window->average_tpt = IWL_INVALID_VALUE;
2402 /* Should we stay with this modulation mode,
2403 * or search for a new one? */
2404 rs_stay_in_table(lq_sta, false);
2409 /* If we are searching for better modulation mode, check success. */
2410 if (lq_sta->search_better_tbl) {
2411 /* If good success, continue using the "search" mode;
2412 * no need to send new link quality command, since we're
2413 * continuing to use the setup that we've been trying. */
2414 if (window->average_tpt > lq_sta->last_tpt) {
2416 "SWITCHING TO NEW TABLE SR: %d "
2417 "cur-tpt %d old-tpt %d\n",
2418 window->success_ratio,
2419 window->average_tpt,
2422 /* Swap tables; "search" becomes "active" */
2423 lq_sta->active_tbl = active_tbl;
2424 current_tpt = window->average_tpt;
2425 /* Else poor success; go back to mode in "active" table */
2428 "GOING BACK TO THE OLD TABLE: SR %d "
2429 "cur-tpt %d old-tpt %d\n",
2430 window->success_ratio,
2431 window->average_tpt,
2434 /* Nullify "search" table */
2435 rate->type = LQ_NONE;
2437 /* Revert to "active" table */
2438 active_tbl = lq_sta->active_tbl;
2439 tbl = &(lq_sta->lq_info[active_tbl]);
2441 /* Revert to "active" rate and throughput info */
2442 index = tbl->rate.index;
2443 current_tpt = lq_sta->last_tpt;
2445 /* Need to set up a new rate table in uCode */
2449 /* Either way, we've made a decision; modulation mode
2450 * search is done, allow rate adjustment next time. */
2451 lq_sta->search_better_tbl = 0;
2452 done_search = 1; /* Don't switch modes below! */
2456 /* (Else) not in search of better modulation mode, try for better
2457 * starting rate, while staying in this mode. */
2458 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2459 low = high_low & 0xff;
2460 high = (high_low >> 8) & 0xff;
2462 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2464 sr = window->success_ratio;
2466 /* Collect measured throughputs for current and adjacent rates */
2467 current_tpt = window->average_tpt;
2468 if (low != IWL_RATE_INVALID)
2469 low_tpt = tbl->win[low].average_tpt;
2470 if (high != IWL_RATE_INVALID)
2471 high_tpt = tbl->win[high].average_tpt;
2474 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2475 rs_pretty_rate(rate), current_tpt, sr,
2476 low, high, low_tpt, high_tpt);
2478 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2479 current_tpt, low_tpt, high_tpt);
2481 /* Force a search in case BT doesn't like us being in MIMO */
2482 if (is_mimo(rate) &&
2483 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2485 "BT Coex forbids MIMO. Search for new config\n");
2486 rs_stay_in_table(lq_sta, true);
2490 switch (scale_action) {
2491 case RS_ACTION_DOWNSCALE:
2492 /* Decrease starting rate, update uCode's rate table */
2493 if (low != IWL_RATE_INVALID) {
2498 "At the bottom rate. Can't decrease\n");
2502 case RS_ACTION_UPSCALE:
2503 /* Increase starting rate, update uCode's rate table */
2504 if (high != IWL_RATE_INVALID) {
2509 "At the top rate. Can't increase\n");
2513 case RS_ACTION_STAY:
2515 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2516 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2523 /* Replace uCode's rate table for the destination station. */
2525 tbl->rate.index = index;
2526 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2527 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2528 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2529 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2532 rs_stay_in_table(lq_sta, false);
2535 * Search for new modulation mode if we're:
2536 * 1) Not changing rates right now
2537 * 2) Not just finishing up a search
2538 * 3) Allowing a new search
2540 if (!update_lq && !done_search &&
2541 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2542 && window->counter) {
2543 enum rs_column next_column;
2545 /* Save current throughput to compare with "search" throughput*/
2546 lq_sta->last_tpt = current_tpt;
2549 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2550 update_lq, done_search, lq_sta->rs_state,
2553 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2554 if (next_column != RS_COLUMN_INVALID) {
2555 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2558 lq_sta->search_better_tbl = 1;
2561 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2562 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2565 /* If new "search" mode was selected, set up in uCode table */
2566 if (lq_sta->search_better_tbl) {
2567 /* Access the "search" table, clear its history. */
2568 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2569 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2571 /* Use new "search" start rate */
2572 index = tbl->rate.index;
2574 rs_dump_rate(mvm, &tbl->rate,
2575 "Switch to SEARCH TABLE:");
2576 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2583 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2585 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2586 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2587 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2591 struct rs_init_rate_info {
2596 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2597 { -60, IWL_RATE_54M_INDEX },
2598 { -64, IWL_RATE_48M_INDEX },
2599 { -68, IWL_RATE_36M_INDEX },
2600 { -80, IWL_RATE_24M_INDEX },
2601 { -84, IWL_RATE_18M_INDEX },
2602 { -85, IWL_RATE_12M_INDEX },
2603 { -86, IWL_RATE_11M_INDEX },
2604 { -88, IWL_RATE_5M_INDEX },
2605 { -90, IWL_RATE_2M_INDEX },
2606 { S8_MIN, IWL_RATE_1M_INDEX },
2609 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2610 { -60, IWL_RATE_54M_INDEX },
2611 { -64, IWL_RATE_48M_INDEX },
2612 { -72, IWL_RATE_36M_INDEX },
2613 { -80, IWL_RATE_24M_INDEX },
2614 { -84, IWL_RATE_18M_INDEX },
2615 { -85, IWL_RATE_12M_INDEX },
2616 { -87, IWL_RATE_9M_INDEX },
2617 { S8_MIN, IWL_RATE_6M_INDEX },
2620 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2621 { -60, IWL_RATE_MCS_7_INDEX },
2622 { -64, IWL_RATE_MCS_6_INDEX },
2623 { -68, IWL_RATE_MCS_5_INDEX },
2624 { -72, IWL_RATE_MCS_4_INDEX },
2625 { -80, IWL_RATE_MCS_3_INDEX },
2626 { -84, IWL_RATE_MCS_2_INDEX },
2627 { -85, IWL_RATE_MCS_1_INDEX },
2628 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2631 /* MCS index 9 is not valid for 20MHz VHT channel width,
2632 * but is ok for 40, 80 and 160MHz channels.
2634 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2635 { -60, IWL_RATE_MCS_8_INDEX },
2636 { -64, IWL_RATE_MCS_7_INDEX },
2637 { -68, IWL_RATE_MCS_6_INDEX },
2638 { -72, IWL_RATE_MCS_5_INDEX },
2639 { -80, IWL_RATE_MCS_4_INDEX },
2640 { -84, IWL_RATE_MCS_3_INDEX },
2641 { -85, IWL_RATE_MCS_2_INDEX },
2642 { -87, IWL_RATE_MCS_1_INDEX },
2643 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2646 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2647 { -60, IWL_RATE_MCS_9_INDEX },
2648 { -64, IWL_RATE_MCS_8_INDEX },
2649 { -68, IWL_RATE_MCS_7_INDEX },
2650 { -72, IWL_RATE_MCS_6_INDEX },
2651 { -80, IWL_RATE_MCS_5_INDEX },
2652 { -84, IWL_RATE_MCS_4_INDEX },
2653 { -85, IWL_RATE_MCS_3_INDEX },
2654 { -87, IWL_RATE_MCS_2_INDEX },
2655 { -88, IWL_RATE_MCS_1_INDEX },
2656 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2659 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2661 /* Init the optimal rate based on STA caps
2662 * This combined with rssi is used to report the last tx rate
2663 * to userspace when we haven't transmitted enough frames.
2665 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2666 struct ieee80211_sta *sta,
2667 struct iwl_lq_sta *lq_sta)
2669 struct rs_rate *rate = &lq_sta->optimal_rate;
2671 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2672 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2673 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2674 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2675 else if (lq_sta->band == NL80211_BAND_5GHZ)
2676 rate->type = LQ_LEGACY_A;
2678 rate->type = LQ_LEGACY_G;
2680 rate->bw = rs_bw_from_sta_bw(sta);
2681 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2683 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2685 if (is_mimo(rate)) {
2686 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2687 } else if (is_siso(rate)) {
2688 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2690 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2692 if (lq_sta->band == NL80211_BAND_5GHZ) {
2693 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2694 lq_sta->optimal_nentries =
2695 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2697 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2698 lq_sta->optimal_nentries =
2699 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2704 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2705 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2706 lq_sta->optimal_nentries =
2707 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2709 lq_sta->optimal_rates = rs_optimal_rates_vht;
2710 lq_sta->optimal_nentries =
2711 ARRAY_SIZE(rs_optimal_rates_vht);
2713 } else if (is_ht(rate)) {
2714 lq_sta->optimal_rates = rs_optimal_rates_ht;
2715 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2719 /* Compute the optimal rate index based on RSSI */
2720 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2721 struct iwl_lq_sta *lq_sta)
2723 struct rs_rate *rate = &lq_sta->optimal_rate;
2726 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2729 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2730 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2732 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2733 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2734 rate->index = rate_idx;
2742 /* Choose an initial legacy rate and antenna to use based on the RSSI
2745 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2746 struct ieee80211_sta *sta,
2747 struct iwl_lq_sta *lq_sta,
2748 enum nl80211_band band,
2749 struct rs_rate *rate)
2751 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2753 unsigned long active_rate;
2754 s8 best_rssi = S8_MIN;
2755 u8 best_ant = ANT_NONE;
2756 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2757 const struct rs_init_rate_info *initial_rates;
2759 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2760 if (!(lq_sta->pers.chains & BIT(i)))
2763 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2764 best_rssi = lq_sta->pers.chain_signal[i];
2769 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2770 rs_pretty_ant(best_ant), best_rssi);
2772 if (best_ant != ANT_A && best_ant != ANT_B)
2773 rate->ant = first_antenna(valid_tx_ant);
2775 rate->ant = best_ant;
2779 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2781 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2784 if (band == NL80211_BAND_5GHZ) {
2785 rate->type = LQ_LEGACY_A;
2786 initial_rates = rs_optimal_rates_5ghz_legacy;
2787 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2789 rate->type = LQ_LEGACY_G;
2790 initial_rates = rs_optimal_rates_24ghz_legacy;
2791 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2794 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2797 /* Start from a higher rate if the corresponding debug capability
2798 * is enabled. The rate is chosen according to AP capabilities.
2799 * In case of VHT/HT when the rssi is low fallback to the case of
2802 if (sta->vht_cap.vht_supported &&
2803 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2805 * In AP mode, when a new station associates, rs is initialized
2806 * immediately upon association completion, before the phy
2807 * context is updated with the association parameters, so the
2808 * sta bandwidth might be wider than the phy context allows.
2809 * To avoid this issue, always initialize rs with 20mhz
2810 * bandwidth rate, and after authorization, when the phy context
2811 * is already up-to-date, re-init rs with the correct bw.
2813 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2814 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2817 case RATE_MCS_CHAN_WIDTH_40:
2818 case RATE_MCS_CHAN_WIDTH_80:
2819 case RATE_MCS_CHAN_WIDTH_160:
2820 initial_rates = rs_optimal_rates_vht;
2821 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2823 case RATE_MCS_CHAN_WIDTH_20:
2824 initial_rates = rs_optimal_rates_vht_20mhz;
2825 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2828 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2832 active_rate = lq_sta->active_siso_rate;
2833 rate->type = LQ_VHT_SISO;
2835 } else if (sta->ht_cap.ht_supported &&
2836 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2837 initial_rates = rs_optimal_rates_ht;
2838 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2839 active_rate = lq_sta->active_siso_rate;
2840 rate->type = LQ_HT_SISO;
2842 active_rate = lq_sta->active_legacy_rate;
2845 for (i = 0; i < nentries; i++) {
2846 int rate_idx = initial_rates[i].rate_idx;
2848 if ((best_rssi >= initial_rates[i].rssi) &&
2849 (BIT(rate_idx) & active_rate)) {
2850 rate->index = rate_idx;
2856 rs_dump_rate(mvm, rate, "INITIAL");
2859 /* Save info about RSSI of last Rx */
2860 void rs_update_last_rssi(struct iwl_mvm *mvm,
2861 struct iwl_mvm_sta *mvmsta,
2862 struct ieee80211_rx_status *rx_status)
2864 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2867 lq_sta->pers.chains = rx_status->chains;
2868 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2869 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2870 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2871 lq_sta->pers.last_rssi = S8_MIN;
2873 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2874 if (!(lq_sta->pers.chains & BIT(i)))
2877 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2878 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2883 * rs_initialize_lq - Initialize a station's hardware rate table
2885 * The uCode's station table contains a table of fallback rates
2886 * for automatic fallback during transmission.
2888 * NOTE: This sets up a default set of values. These will be replaced later
2889 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2892 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2893 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2894 * which requires station table entry to exist).
2896 static void rs_initialize_lq(struct iwl_mvm *mvm,
2897 struct ieee80211_sta *sta,
2898 struct iwl_lq_sta *lq_sta,
2899 enum nl80211_band band, bool update)
2901 struct iwl_scale_tbl_info *tbl;
2902 struct rs_rate *rate;
2905 if (!sta || !lq_sta)
2908 if (!lq_sta->search_better_tbl)
2909 active_tbl = lq_sta->active_tbl;
2911 active_tbl = 1 - lq_sta->active_tbl;
2913 tbl = &(lq_sta->lq_info[active_tbl]);
2916 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2917 rs_init_optimal_rate(mvm, sta, lq_sta);
2919 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2920 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2921 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2922 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2924 tbl->column = rs_get_column_from_rate(rate);
2926 rs_set_expected_tpt_table(lq_sta, tbl);
2927 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2928 /* TODO restore station should remember the lq cmd */
2929 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, !update);
2932 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2934 struct ieee80211_tx_rate_control *txrc)
2936 struct iwl_op_mode *op_mode = mvm_r;
2937 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2938 struct sk_buff *skb = txrc->skb;
2939 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2940 struct iwl_lq_sta *lq_sta;
2941 struct rs_rate *optimal_rate;
2942 u32 last_ucode_rate;
2944 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2945 /* if vif isn't initialized mvm doesn't know about
2946 * this station, so don't do anything with the it
2956 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2957 info->band, &info->control.rates[0]);
2958 info->control.rates[0].count = 1;
2960 /* Report the optimal rate based on rssi and STA caps if we haven't
2961 * converged yet (too little traffic) or exploring other modulations
2963 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2964 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2965 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2967 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2968 &txrc->reported_rate);
2972 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2975 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2976 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2977 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2978 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2980 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2982 lq_sta->pers.drv = mvm;
2983 #ifdef CONFIG_MAC80211_DEBUGFS
2984 lq_sta->pers.dbg_fixed_rate = 0;
2985 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2986 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2988 lq_sta->pers.chains = 0;
2989 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2990 lq_sta->pers.last_rssi = S8_MIN;
2995 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2998 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2999 (0x3 << (2 * (nss - 1)));
3000 rx_mcs >>= (2 * (nss - 1));
3002 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
3003 return IWL_RATE_MCS_7_INDEX;
3004 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
3005 return IWL_RATE_MCS_8_INDEX;
3006 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
3007 return IWL_RATE_MCS_9_INDEX;
3009 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
3013 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
3014 struct ieee80211_sta_vht_cap *vht_cap,
3015 struct iwl_lq_sta *lq_sta)
3018 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
3020 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3021 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3022 if (i == IWL_RATE_9M_INDEX)
3025 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3026 if (i == IWL_RATE_MCS_9_INDEX &&
3027 sta->bandwidth == IEEE80211_STA_RX_BW_20)
3030 lq_sta->active_siso_rate |= BIT(i);
3034 if (sta->rx_nss < 2)
3037 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
3038 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3039 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3040 if (i == IWL_RATE_9M_INDEX)
3043 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3044 if (i == IWL_RATE_MCS_9_INDEX &&
3045 sta->bandwidth == IEEE80211_STA_RX_BW_20)
3048 lq_sta->active_mimo2_rate |= BIT(i);
3053 static void rs_ht_init(struct iwl_mvm *mvm,
3054 struct ieee80211_sta *sta,
3055 struct iwl_lq_sta *lq_sta,
3056 struct ieee80211_sta_ht_cap *ht_cap)
3058 /* active_siso_rate mask includes 9 MBits (bit 5),
3059 * and CCK (bits 0-3), supp_rates[] does not;
3060 * shift to convert format, force 9 MBits off.
3062 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3063 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3064 lq_sta->active_siso_rate &= ~((u16)0x2);
3065 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3067 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3068 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3069 lq_sta->active_mimo2_rate &= ~((u16)0x2);
3070 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3072 if (mvm->cfg->ht_params->ldpc &&
3073 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3074 lq_sta->ldpc = true;
3076 if (mvm->cfg->ht_params->stbc &&
3077 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3078 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3079 lq_sta->stbc_capable = true;
3081 lq_sta->is_vht = false;
3084 static void rs_vht_init(struct iwl_mvm *mvm,
3085 struct ieee80211_sta *sta,
3086 struct iwl_lq_sta *lq_sta,
3087 struct ieee80211_sta_vht_cap *vht_cap)
3089 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3091 if (mvm->cfg->ht_params->ldpc &&
3092 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3093 lq_sta->ldpc = true;
3095 if (mvm->cfg->ht_params->stbc &&
3096 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3097 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3098 lq_sta->stbc_capable = true;
3100 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3101 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3102 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3103 lq_sta->bfer_capable = true;
3105 lq_sta->is_vht = true;
3108 #ifdef CONFIG_IWLWIFI_DEBUGFS
3109 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3111 spin_lock_bh(&mvm->drv_stats_lock);
3112 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3113 spin_unlock_bh(&mvm->drv_stats_lock);
3116 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3120 spin_lock(&mvm->drv_stats_lock);
3123 mvm->drv_rx_stats.agg_frames++;
3125 mvm->drv_rx_stats.success_frames++;
3127 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3128 case RATE_MCS_CHAN_WIDTH_20:
3129 mvm->drv_rx_stats.bw_20_frames++;
3131 case RATE_MCS_CHAN_WIDTH_40:
3132 mvm->drv_rx_stats.bw_40_frames++;
3134 case RATE_MCS_CHAN_WIDTH_80:
3135 mvm->drv_rx_stats.bw_80_frames++;
3137 case RATE_MCS_CHAN_WIDTH_160:
3138 mvm->drv_rx_stats.bw_160_frames++;
3141 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3144 if (rate & RATE_MCS_HT_MSK) {
3145 mvm->drv_rx_stats.ht_frames++;
3146 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3147 } else if (rate & RATE_MCS_VHT_MSK) {
3148 mvm->drv_rx_stats.vht_frames++;
3149 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3150 RATE_VHT_MCS_NSS_POS) + 1;
3152 mvm->drv_rx_stats.legacy_frames++;
3156 mvm->drv_rx_stats.siso_frames++;
3158 mvm->drv_rx_stats.mimo2_frames++;
3160 if (rate & RATE_MCS_SGI_MSK)
3161 mvm->drv_rx_stats.sgi_frames++;
3163 mvm->drv_rx_stats.ngi_frames++;
3165 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3166 mvm->drv_rx_stats.last_frame_idx =
3167 (mvm->drv_rx_stats.last_frame_idx + 1) %
3168 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3170 spin_unlock(&mvm->drv_stats_lock);
3175 * Called after adding a new station to initialize rate scaling
3177 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3178 enum nl80211_band band, bool update)
3181 struct ieee80211_hw *hw = mvm->hw;
3182 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3183 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3184 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3185 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3186 struct ieee80211_supported_band *sband;
3187 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3189 /* clear all non-persistent lq data */
3190 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3192 sband = hw->wiphy->bands[band];
3194 lq_sta->lq.sta_id = mvmsta->sta_id;
3195 mvmsta->amsdu_enabled = 0;
3196 mvmsta->max_amsdu_len = sta->max_amsdu_len;
3198 for (j = 0; j < LQ_SIZE; j++)
3199 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3201 lq_sta->flush_timer = 0;
3202 lq_sta->last_tx = jiffies;
3205 "LQ: *** rate scale station global init for station %d ***\n",
3207 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3208 * the lowest or the highest rate.. Could consider using RSSI from
3209 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3212 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3213 lq_sta->band = sband->band;
3215 * active legacy rates as per supported rates bitmap
3217 supp = sta->supp_rates[sband->band];
3218 lq_sta->active_legacy_rate = 0;
3219 for_each_set_bit(i, &supp, BITS_PER_LONG)
3220 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3222 /* TODO: should probably account for rx_highest for both HT/VHT */
3223 if (!vht_cap || !vht_cap->vht_supported)
3224 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3226 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3228 lq_sta->max_legacy_rate_idx =
3229 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3230 lq_sta->max_siso_rate_idx =
3231 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3232 lq_sta->max_mimo2_rate_idx =
3233 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3236 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3237 lq_sta->active_legacy_rate,
3238 lq_sta->active_siso_rate,
3239 lq_sta->active_mimo2_rate,
3240 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3241 lq_sta->bfer_capable);
3242 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3243 lq_sta->max_legacy_rate_idx,
3244 lq_sta->max_siso_rate_idx,
3245 lq_sta->max_mimo2_rate_idx);
3247 /* These values will be overridden later */
3248 lq_sta->lq.single_stream_ant_msk =
3249 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
3250 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3252 /* as default allow aggregation for all tids */
3253 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3255 #ifdef CONFIG_IWLWIFI_DEBUGFS
3256 iwl_mvm_reset_frame_stats(mvm);
3258 rs_initialize_lq(mvm, sta, lq_sta, band, update);
3261 static void rs_drv_rate_update(void *mvm_r,
3262 struct ieee80211_supported_band *sband,
3263 struct cfg80211_chan_def *chandef,
3264 struct ieee80211_sta *sta,
3265 void *priv_sta, u32 changed)
3267 struct iwl_op_mode *op_mode = mvm_r;
3268 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3271 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3274 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3275 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3276 ieee80211_stop_tx_ba_session(sta, tid);
3278 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3281 #ifdef CONFIG_MAC80211_DEBUGFS
3282 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3283 struct iwl_lq_cmd *lq_cmd,
3284 enum nl80211_band band,
3287 struct rs_rate rate;
3289 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3290 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3291 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3293 for (i = 0; i < num_rates; i++)
3294 lq_cmd->rs_table[i] = ucode_rate_le32;
3296 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3302 lq_cmd->mimo_delim = num_rates - 1;
3304 lq_cmd->mimo_delim = 0;
3306 lq_cmd->reduced_tpc = 0;
3308 if (num_of_ant(ant) == 1)
3309 lq_cmd->single_stream_ant_msk = ant;
3311 if (!mvm->trans->cfg->gen2)
3312 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3314 lq_cmd->agg_frame_cnt_limit =
3315 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3317 #endif /* CONFIG_MAC80211_DEBUGFS */
3319 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3320 struct iwl_lq_sta *lq_sta,
3321 struct rs_rate *rate,
3322 __le32 *rs_table, int *rs_table_index,
3323 int num_rates, int num_retries,
3324 u8 valid_tx_ant, bool toggle_ant)
3328 bool bottom_reached = false;
3329 int prev_rate_idx = rate->index;
3330 int end = LINK_QUAL_MAX_RETRY_NUM;
3331 int index = *rs_table_index;
3333 for (i = 0; i < num_rates && index < end; i++) {
3334 for (j = 0; j < num_retries && index < end; j++, index++) {
3335 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3337 rs_table[index] = ucode_rate;
3339 rs_toggle_antenna(valid_tx_ant, rate);
3342 prev_rate_idx = rate->index;
3343 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3344 if (bottom_reached && !is_legacy(rate))
3348 if (!bottom_reached && !is_legacy(rate))
3349 rate->index = prev_rate_idx;
3351 *rs_table_index = index;
3354 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3355 * column the rate table should look like this:
3357 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3358 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3359 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3360 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3361 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3362 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3363 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3364 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3365 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3366 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3367 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3368 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3369 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3370 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3371 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3372 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3374 static void rs_build_rates_table(struct iwl_mvm *mvm,
3375 struct ieee80211_sta *sta,
3376 struct iwl_lq_sta *lq_sta,
3377 const struct rs_rate *initial_rate)
3379 struct rs_rate rate;
3380 int num_rates, num_retries, index = 0;
3381 u8 valid_tx_ant = 0;
3382 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3383 bool toggle_ant = false;
3386 memcpy(&rate, initial_rate, sizeof(rate));
3388 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3390 /* TODO: remove old API when min FW API hits 14 */
3391 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3392 rs_stbc_allow(mvm, sta, lq_sta))
3395 if (is_siso(&rate)) {
3396 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3397 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3398 } else if (is_mimo(&rate)) {
3399 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3400 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3402 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3403 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3407 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3408 num_rates, num_retries, valid_tx_ant,
3411 rs_get_lower_rate_down_column(lq_sta, &rate);
3413 if (is_siso(&rate)) {
3414 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3415 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3416 lq_cmd->mimo_delim = index;
3417 } else if (is_legacy(&rate)) {
3418 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3419 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3426 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3427 num_rates, num_retries, valid_tx_ant,
3430 rs_get_lower_rate_down_column(lq_sta, &rate);
3432 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3433 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3435 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3436 num_rates, num_retries, valid_tx_ant,
3439 /* update the color of the LQ command (as a counter at bits 1-3) */
3440 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3441 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3444 struct rs_bfer_active_iter_data {
3445 struct ieee80211_sta *exclude_sta;
3446 struct iwl_mvm_sta *bfer_mvmsta;
3449 static void rs_bfer_active_iter(void *_data,
3450 struct ieee80211_sta *sta)
3452 struct rs_bfer_active_iter_data *data = _data;
3453 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3454 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3455 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3457 if (sta == data->exclude_sta)
3460 /* The current sta has BFER allowed */
3461 if (ss_params & LQ_SS_BFER_ALLOWED) {
3462 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3464 data->bfer_mvmsta = mvmsta;
3468 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3471 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3474 case NL80211_IFTYPE_AP:
3475 case NL80211_IFTYPE_P2P_GO:
3478 case NL80211_IFTYPE_P2P_CLIENT:
3481 case NL80211_IFTYPE_STATION:
3485 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3492 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3493 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3494 struct iwl_mvm_sta *sta2)
3496 int prio1 = rs_bfer_priority(sta1);
3497 int prio2 = rs_bfer_priority(sta2);
3506 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3507 struct ieee80211_sta *sta,
3508 struct iwl_lq_sta *lq_sta,
3509 const struct rs_rate *initial_rate)
3511 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3512 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3513 struct rs_bfer_active_iter_data data = {
3515 .bfer_mvmsta = NULL,
3517 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3518 u32 ss_params = LQ_SS_PARAMS_VALID;
3520 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3523 #ifdef CONFIG_MAC80211_DEBUGFS
3524 /* Check if forcing the decision is configured.
3525 * Note that SISO is forced by not allowing STBC or BFER
3527 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3528 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3529 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3530 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3532 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3533 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3534 lq_sta->pers.ss_force);
3539 if (lq_sta->stbc_capable)
3540 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3542 if (!lq_sta->bfer_capable)
3545 ieee80211_iterate_stations_atomic(mvm->hw,
3546 rs_bfer_active_iter,
3548 bfer_mvmsta = data.bfer_mvmsta;
3550 /* This code is safe as it doesn't run concurrently for different
3551 * stations. This is guaranteed by the fact that calls to
3552 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3555 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3557 ss_params |= LQ_SS_BFER_ALLOWED;
3561 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3562 bfer_mvmsta->sta_id);
3564 /* Disallow BFER on another STA if active and we're a higher priority */
3565 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3566 struct iwl_lq_cmd *bfersta_lq_cmd =
3567 &bfer_mvmsta->lq_sta.rs_drv.lq;
3568 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3570 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3571 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3572 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3574 ss_params |= LQ_SS_BFER_ALLOWED;
3576 "Lower priority BFER sta found (%d). Switch BFER\n",
3577 bfer_mvmsta->sta_id);
3580 lq_cmd->ss_params = cpu_to_le32(ss_params);
3583 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3584 struct ieee80211_sta *sta,
3585 struct iwl_lq_sta *lq_sta,
3586 const struct rs_rate *initial_rate)
3588 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3589 struct iwl_mvm_sta *mvmsta;
3590 struct iwl_mvm_vif *mvmvif;
3592 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3593 lq_cmd->agg_time_limit =
3594 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3596 #ifdef CONFIG_MAC80211_DEBUGFS
3597 if (lq_sta->pers.dbg_fixed_rate) {
3598 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3600 lq_sta->pers.dbg_fixed_rate);
3604 if (WARN_ON_ONCE(!sta || !initial_rate))
3607 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3609 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3610 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3612 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3613 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3615 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3616 num_of_ant(initial_rate->ant) == 1)
3617 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3619 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3622 * In case of low latency, tell the firmware to leave a frame in the
3623 * Tx Fifo so that it can start a transaction in the same TxOP. This
3624 * basically allows the firmware to send bursts.
3626 if (iwl_mvm_vif_low_latency(mvmvif))
3627 lq_cmd->agg_frame_cnt_limit--;
3629 if (mvmsta->vif->p2p)
3630 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3632 lq_cmd->agg_time_limit =
3633 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3636 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3641 /* rate scale requires free function to be implemented */
3642 static void rs_free(void *mvm_rate)
3647 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3649 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3650 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3652 IWL_DEBUG_RATE(mvm, "enter\n");
3653 IWL_DEBUG_RATE(mvm, "leave\n");
3656 #ifdef CONFIG_MAC80211_DEBUGFS
3657 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3661 u8 mcs = 0, nss = 0;
3662 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3664 if (!(rate & RATE_MCS_HT_MSK) &&
3665 !(rate & RATE_MCS_VHT_MSK) &&
3666 !(rate & RATE_MCS_HE_MSK)) {
3667 int index = iwl_hwrate_to_plcp_idx(rate);
3669 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n",
3671 index == IWL_RATE_INVALID ? "BAD" :
3672 iwl_rate_mcs[index].mbps);
3675 if (rate & RATE_MCS_VHT_MSK) {
3677 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3678 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3679 >> RATE_VHT_MCS_NSS_POS) + 1;
3680 } else if (rate & RATE_MCS_HT_MSK) {
3682 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3683 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3684 >> RATE_HT_MCS_NSS_POS) + 1;
3685 } else if (rate & RATE_MCS_HE_MSK) {
3687 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3688 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3689 >> RATE_VHT_MCS_NSS_POS) + 1;
3691 type = "Unknown"; /* shouldn't happen */
3694 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3695 case RATE_MCS_CHAN_WIDTH_20:
3698 case RATE_MCS_CHAN_WIDTH_40:
3701 case RATE_MCS_CHAN_WIDTH_80:
3704 case RATE_MCS_CHAN_WIDTH_160:
3711 return scnprintf(buf, bufsz,
3712 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3713 type, rs_pretty_ant(ant), bw, mcs, nss,
3714 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3715 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3716 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3717 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3721 * Program the device to use fixed rate for frame transmit
3722 * This is for debugging/testing only
3723 * once the device start use fixed rate, we need to reload the module
3724 * to being back the normal operation.
3726 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3727 struct iwl_lq_sta *lq_sta)
3729 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3730 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3731 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3733 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3734 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3736 if (lq_sta->pers.dbg_fixed_rate) {
3737 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3738 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3742 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3743 const char __user *user_buf, size_t count, loff_t *ppos)
3745 struct iwl_lq_sta *lq_sta = file->private_data;
3746 struct iwl_mvm *mvm;
3751 mvm = lq_sta->pers.drv;
3752 memset(buf, 0, sizeof(buf));
3753 buf_size = min(count, sizeof(buf) - 1);
3754 if (copy_from_user(buf, user_buf, buf_size))
3757 if (sscanf(buf, "%x", &parsed_rate) == 1)
3758 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3760 lq_sta->pers.dbg_fixed_rate = 0;
3762 rs_program_fix_rate(mvm, lq_sta);
3767 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3768 char __user *user_buf, size_t count, loff_t *ppos)
3774 static const size_t bufsz = 2048;
3776 struct iwl_lq_sta *lq_sta = file->private_data;
3777 struct iwl_mvm_sta *mvmsta =
3778 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3779 struct iwl_mvm *mvm;
3780 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3781 struct rs_rate *rate = &tbl->rate;
3784 mvm = lq_sta->pers.drv;
3785 buff = kmalloc(bufsz, GFP_KERNEL);
3789 desc += scnprintf(buff + desc, bufsz - desc,
3790 "sta_id %d\n", lq_sta->lq.sta_id);
3791 desc += scnprintf(buff + desc, bufsz - desc,
3792 "failed=%d success=%d rate=0%lX\n",
3793 lq_sta->total_failed, lq_sta->total_success,
3794 lq_sta->active_legacy_rate);
3795 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3796 lq_sta->pers.dbg_fixed_rate);
3797 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3798 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3799 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3800 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3801 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3802 (is_legacy(rate)) ? "legacy" :
3803 is_vht(rate) ? "VHT" : "HT");
3804 if (!is_legacy(rate)) {
3805 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3806 (is_siso(rate)) ? "SISO" : "MIMO2");
3807 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3808 (is_ht20(rate)) ? "20MHz" :
3809 (is_ht40(rate)) ? "40MHz" :
3810 (is_ht80(rate)) ? "80MHz" :
3811 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3812 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3813 (rate->sgi) ? "SGI" : "NGI",
3814 (rate->ldpc) ? "LDPC" : "BCC",
3815 (lq_sta->is_agg) ? "AGG on" : "",
3816 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3818 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3819 lq_sta->last_rate_n_flags);
3820 desc += scnprintf(buff + desc, bufsz - desc,
3821 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3823 lq_sta->lq.mimo_delim,
3824 lq_sta->lq.single_stream_ant_msk,
3825 lq_sta->lq.dual_stream_ant_msk);
3827 desc += scnprintf(buff + desc, bufsz - desc,
3828 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3829 le16_to_cpu(lq_sta->lq.agg_time_limit),
3830 lq_sta->lq.agg_disable_start_th,
3831 lq_sta->lq.agg_frame_cnt_limit);
3833 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3834 lq_sta->lq.reduced_tpc);
3835 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3836 desc += scnprintf(buff + desc, bufsz - desc,
3837 "single stream params: %s%s%s%s\n",
3838 (ss_params & LQ_SS_PARAMS_VALID) ?
3839 "VALID" : "INVALID",
3840 (ss_params & LQ_SS_BFER_ALLOWED) ?
3842 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3844 (ss_params & LQ_SS_FORCE) ?
3846 desc += scnprintf(buff + desc, bufsz - desc,
3847 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3848 lq_sta->lq.initial_rate_index[0],
3849 lq_sta->lq.initial_rate_index[1],
3850 lq_sta->lq.initial_rate_index[2],
3851 lq_sta->lq.initial_rate_index[3]);
3853 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3854 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3856 desc += scnprintf(buff + desc, bufsz - desc,
3857 " rate[%d] 0x%X ", i, r);
3858 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3861 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3866 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3867 .write = rs_sta_dbgfs_scale_table_write,
3868 .read = rs_sta_dbgfs_scale_table_read,
3869 .open = simple_open,
3870 .llseek = default_llseek,
3872 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3873 char __user *user_buf, size_t count, loff_t *ppos)
3879 struct iwl_scale_tbl_info *tbl;
3880 struct rs_rate *rate;
3881 struct iwl_lq_sta *lq_sta = file->private_data;
3883 buff = kmalloc(1024, GFP_KERNEL);
3887 for (i = 0; i < LQ_SIZE; i++) {
3888 tbl = &(lq_sta->lq_info[i]);
3890 desc += sprintf(buff+desc,
3891 "%s type=%d SGI=%d BW=%s DUP=0\n"
3893 lq_sta->active_tbl == i ? "*" : "x",
3896 is_ht20(rate) ? "20MHz" :
3897 is_ht40(rate) ? "40MHz" :
3898 is_ht80(rate) ? "80MHz" :
3899 is_ht160(rate) ? "160MHz" : "ERR",
3901 for (j = 0; j < IWL_RATE_COUNT; j++) {
3902 desc += sprintf(buff+desc,
3903 "counter=%d success=%d %%=%d\n",
3904 tbl->win[j].counter,
3905 tbl->win[j].success_counter,
3906 tbl->win[j].success_ratio);
3909 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3914 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3915 .read = rs_sta_dbgfs_stats_table_read,
3916 .open = simple_open,
3917 .llseek = default_llseek,
3920 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3921 char __user *user_buf,
3922 size_t count, loff_t *ppos)
3924 static const char * const column_name[] = {
3925 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3926 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3927 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3928 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3929 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3930 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3931 [RS_COLUMN_MIMO2] = "MIMO2",
3932 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3935 static const char * const rate_name[] = {
3936 [IWL_RATE_1M_INDEX] = "1M",
3937 [IWL_RATE_2M_INDEX] = "2M",
3938 [IWL_RATE_5M_INDEX] = "5.5M",
3939 [IWL_RATE_11M_INDEX] = "11M",
3940 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3941 [IWL_RATE_9M_INDEX] = "9M",
3942 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3943 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3944 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3945 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3946 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3947 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3948 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3949 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3950 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3951 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3952 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3955 char *buff, *pos, *endpos;
3958 struct iwl_lq_sta *lq_sta = file->private_data;
3959 struct rs_rate_stats *stats;
3960 static const size_t bufsz = 1024;
3962 buff = kmalloc(bufsz, GFP_KERNEL);
3967 endpos = pos + bufsz;
3969 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3970 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3971 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3972 pos += scnprintf(pos, endpos - pos, "\n");
3974 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3975 pos += scnprintf(pos, endpos - pos,
3976 "%s,", column_name[col]);
3978 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3979 stats = &(lq_sta->pers.tx_stats[col][rate]);
3980 pos += scnprintf(pos, endpos - pos,
3985 pos += scnprintf(pos, endpos - pos, "\n");
3988 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3993 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3994 const char __user *user_buf,
3995 size_t count, loff_t *ppos)
3997 struct iwl_lq_sta *lq_sta = file->private_data;
3998 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
4003 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
4004 .read = rs_sta_dbgfs_drv_tx_stats_read,
4005 .write = rs_sta_dbgfs_drv_tx_stats_write,
4006 .open = simple_open,
4007 .llseek = default_llseek,
4010 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
4011 char __user *user_buf,
4012 size_t count, loff_t *ppos)
4014 struct iwl_lq_sta *lq_sta = file->private_data;
4016 int bufsz = sizeof(buf);
4018 static const char * const ss_force_name[] = {
4019 [RS_SS_FORCE_NONE] = "none",
4020 [RS_SS_FORCE_STBC] = "stbc",
4021 [RS_SS_FORCE_BFER] = "bfer",
4022 [RS_SS_FORCE_SISO] = "siso",
4025 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4026 ss_force_name[lq_sta->pers.ss_force]);
4027 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4030 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4031 size_t count, loff_t *ppos)
4033 struct iwl_mvm *mvm = lq_sta->pers.drv;
4036 if (!strncmp("none", buf, 4)) {
4037 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4038 } else if (!strncmp("siso", buf, 4)) {
4039 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4040 } else if (!strncmp("stbc", buf, 4)) {
4041 if (lq_sta->stbc_capable) {
4042 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4045 "can't force STBC. peer doesn't support\n");
4048 } else if (!strncmp("bfer", buf, 4)) {
4049 if (lq_sta->bfer_capable) {
4050 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4053 "can't force BFER. peer doesn't support\n");
4057 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4060 return ret ?: count;
4063 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4064 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4065 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
4066 debugfs_create_file(#name, mode, parent, lq_sta, \
4067 &iwl_dbgfs_##name##_ops); \
4070 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4072 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4075 struct iwl_lq_sta *lq_sta = priv_sta;
4076 struct iwl_mvm_sta *mvmsta;
4078 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4083 debugfs_create_file("rate_scale_table", 0600, dir,
4084 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4085 debugfs_create_file("rate_stats_table", 0400, dir,
4086 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4087 debugfs_create_file("drv_tx_stats", 0600, dir,
4088 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4089 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4090 &lq_sta->tx_agg_tid_en);
4091 debugfs_create_u8("reduced_tpc", 0600, dir,
4092 &lq_sta->pers.dbg_fixed_txp_reduction);
4094 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4097 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta)
4103 * Initialization of rate scaling information is done by driver after
4104 * the station is added. Since mac80211 calls this function before a
4105 * station is added we ignore it.
4107 static void rs_rate_init_ops(void *mvm_r,
4108 struct ieee80211_supported_band *sband,
4109 struct cfg80211_chan_def *chandef,
4110 struct ieee80211_sta *sta, void *mvm_sta)
4114 /* ops for rate scaling implemented in the driver */
4115 static const struct rate_control_ops rs_mvm_ops_drv = {
4117 .tx_status = rs_drv_mac80211_tx_status,
4118 .get_rate = rs_drv_get_rate,
4119 .rate_init = rs_rate_init_ops,
4122 .alloc_sta = rs_drv_alloc_sta,
4123 .free_sta = rs_free_sta,
4124 .rate_update = rs_drv_rate_update,
4125 #ifdef CONFIG_MAC80211_DEBUGFS
4126 .add_sta_debugfs = rs_drv_add_sta_debugfs,
4127 .remove_sta_debugfs = rs_remove_sta_debugfs,
4129 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4132 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4133 enum nl80211_band band, bool update)
4135 if (iwl_mvm_has_tlc_offload(mvm))
4136 rs_fw_rate_init(mvm, sta, band, update);
4138 rs_drv_rate_init(mvm, sta, band, update);
4141 int iwl_mvm_rate_control_register(void)
4143 return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4146 void iwl_mvm_rate_control_unregister(void)
4148 ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4151 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4154 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4156 lockdep_assert_held(&mvm->mutex);
4159 if (mvmsta->tx_protection == 0)
4160 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4161 mvmsta->tx_protection++;
4163 mvmsta->tx_protection--;
4164 if (mvmsta->tx_protection == 0)
4165 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4168 return iwl_mvm_send_lq_cmd(mvm, lq, false);
4172 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4173 * @mvmsta: The station
4174 * @enable: Enable Tx protection?
4176 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4179 if (iwl_mvm_has_tlc_offload(mvm))
4180 return rs_fw_tx_protection(mvm, mvmsta, enable);
4182 return rs_drv_tx_protection(mvm, mvmsta, enable);