1 /******************************************************************************
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
5 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
20 * The full GNU General Public License is included in this distribution in the
21 * file called LICENSE.
23 * Contact Information:
24 * Intel Linux Wireless <linuxwifi@intel.com>
25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28 #include <linux/kernel.h>
29 #include <linux/skbuff.h>
30 #include <linux/slab.h>
31 #include <net/mac80211.h>
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
37 #include <linux/workqueue.h>
41 #include "iwl-op-mode.h"
45 #define RS_NAME "iwl-mvm-rs"
47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
50 * Use this macro when dealing with thresholds consts set as a percentage
52 #define RS_PERCENT(x) (128 * x)
54 static u8 rs_ht_to_legacy[] = {
55 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
56 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
57 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
58 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
59 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
60 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
61 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
62 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
64 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
67 static const u8 ant_toggle_lookup[] = {
68 [ANT_NONE] = ANT_NONE,
78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
84 IWL_RATE_##rp##M_INDEX, \
85 IWL_RATE_##rn##M_INDEX }
87 #define IWL_DECLARE_MCS_RATE(s) \
88 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
89 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
90 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
92 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
93 IWL_RATE_INVM_INDEX, \
98 * rate, ht rate, prev rate, next rate
100 * If there isn't a valid next or previous rate then INV is used which
101 * maps to IWL_RATE_INVALID
104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
105 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
106 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
107 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
108 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
109 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
110 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
111 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
112 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
113 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
114 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
115 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
116 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
117 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
118 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
119 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
124 RS_ACTION_DOWNSCALE = -1,
125 RS_ACTION_UPSCALE = 1,
128 enum rs_column_mode {
135 #define MAX_NEXT_COLUMNS 7
136 #define MAX_COLUMN_CHECKS 3
140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
141 struct ieee80211_sta *sta,
142 struct rs_rate *rate,
143 const struct rs_tx_column *next_col);
145 struct rs_tx_column {
146 enum rs_column_mode mode;
149 enum rs_column next_columns[MAX_NEXT_COLUMNS];
150 allow_column_func_t checks[MAX_COLUMN_CHECKS];
153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
154 struct rs_rate *rate,
155 const struct rs_tx_column *next_col)
157 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
161 struct rs_rate *rate,
162 const struct rs_tx_column *next_col)
164 if (!sta->ht_cap.ht_supported)
167 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
170 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
173 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
176 if (mvm->nvm_data->sku_cap_mimo_disabled)
182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
183 struct rs_rate *rate,
184 const struct rs_tx_column *next_col)
186 if (!sta->ht_cap.ht_supported)
192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
193 struct rs_rate *rate,
194 const struct rs_tx_column *next_col)
196 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
197 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
199 if (is_ht20(rate) && (ht_cap->cap &
200 IEEE80211_HT_CAP_SGI_20))
202 if (is_ht40(rate) && (ht_cap->cap &
203 IEEE80211_HT_CAP_SGI_40))
205 if (is_ht80(rate) && (vht_cap->cap &
206 IEEE80211_VHT_CAP_SHORT_GI_80))
208 if (is_ht160(rate) && (vht_cap->cap &
209 IEEE80211_VHT_CAP_SHORT_GI_160))
215 static const struct rs_tx_column rs_tx_columns[] = {
216 [RS_COLUMN_LEGACY_ANT_A] = {
220 RS_COLUMN_LEGACY_ANT_B,
221 RS_COLUMN_SISO_ANT_A,
232 [RS_COLUMN_LEGACY_ANT_B] = {
236 RS_COLUMN_LEGACY_ANT_A,
237 RS_COLUMN_SISO_ANT_B,
248 [RS_COLUMN_SISO_ANT_A] = {
252 RS_COLUMN_SISO_ANT_B,
254 RS_COLUMN_SISO_ANT_A_SGI,
255 RS_COLUMN_LEGACY_ANT_A,
256 RS_COLUMN_LEGACY_ANT_B,
265 [RS_COLUMN_SISO_ANT_B] = {
269 RS_COLUMN_SISO_ANT_A,
271 RS_COLUMN_SISO_ANT_B_SGI,
272 RS_COLUMN_LEGACY_ANT_A,
273 RS_COLUMN_LEGACY_ANT_B,
282 [RS_COLUMN_SISO_ANT_A_SGI] = {
287 RS_COLUMN_SISO_ANT_B_SGI,
289 RS_COLUMN_SISO_ANT_A,
290 RS_COLUMN_LEGACY_ANT_A,
291 RS_COLUMN_LEGACY_ANT_B,
301 [RS_COLUMN_SISO_ANT_B_SGI] = {
306 RS_COLUMN_SISO_ANT_A_SGI,
308 RS_COLUMN_SISO_ANT_B,
309 RS_COLUMN_LEGACY_ANT_A,
310 RS_COLUMN_LEGACY_ANT_B,
320 [RS_COLUMN_MIMO2] = {
324 RS_COLUMN_SISO_ANT_A,
326 RS_COLUMN_LEGACY_ANT_A,
327 RS_COLUMN_LEGACY_ANT_B,
336 [RS_COLUMN_MIMO2_SGI] = {
341 RS_COLUMN_SISO_ANT_A_SGI,
343 RS_COLUMN_LEGACY_ANT_A,
344 RS_COLUMN_LEGACY_ANT_B,
356 static inline u8 rs_extract_rate(u32 rate_n_flags)
358 /* also works for HT because bits 7:6 are zero there */
359 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
366 if (rate_n_flags & RATE_MCS_HT_MSK) {
367 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
368 idx += IWL_RATE_MCS_0_INDEX;
370 /* skip 9M not supported in HT*/
371 if (idx >= IWL_RATE_9M_INDEX)
373 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
375 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
376 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
377 idx += IWL_RATE_MCS_0_INDEX;
379 /* skip 9M not supported in VHT*/
380 if (idx >= IWL_RATE_9M_INDEX)
382 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
385 /* legacy rate format, search for match in table */
387 u8 legacy_rate = rs_extract_rate(rate_n_flags);
388 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
389 if (iwl_rates[idx].plcp == legacy_rate)
393 return IWL_RATE_INVALID;
396 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
397 struct ieee80211_sta *sta,
398 struct iwl_lq_sta *lq_sta,
400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
401 struct ieee80211_sta *sta,
402 struct iwl_lq_sta *lq_sta,
403 const struct rs_rate *initial_rate);
404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
407 * The following tables contain the expected throughput metrics for all rates
409 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
411 * where invalid entries are zeros.
413 * CCK rates are only valid in legacy table and will only be used in G
417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
418 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
421 /* Expected TpT tables. 4 indexes:
422 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
425 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
426 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
427 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
428 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
432 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
433 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
434 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
435 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
439 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
440 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
441 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
442 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
446 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
447 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
448 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
449 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
453 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
454 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
455 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
456 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
460 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
461 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
462 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
463 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
467 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
468 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
469 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
470 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
474 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
475 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
476 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
477 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
490 { "24", "16QAM 1/2"},
491 { "36", "16QAM 3/4"},
492 { "48", "64QAM 2/3"},
493 { "54", "64QAM 3/4"},
494 { "60", "64QAM 5/6"},
497 #define MCS_INDEX_PER_STREAM (8)
499 static const char *rs_pretty_ant(u8 ant)
501 static const char * const ant_name[] = {
515 return ant_name[ant];
518 static const char *rs_pretty_lq_type(enum iwl_table_type type)
520 static const char * const lq_types[] = {
522 [LQ_LEGACY_A] = "LEGACY_A",
523 [LQ_LEGACY_G] = "LEGACY_G",
524 [LQ_HT_SISO] = "HT SISO",
525 [LQ_HT_MIMO2] = "HT MIMO",
526 [LQ_VHT_SISO] = "VHT SISO",
527 [LQ_VHT_MIMO2] = "VHT MIMO",
530 if (type < LQ_NONE || type >= LQ_MAX)
533 return lq_types[type];
536 static char *rs_pretty_rate(const struct rs_rate *rate)
539 static const char * const legacy_rates[] = {
540 [IWL_RATE_1M_INDEX] = "1M",
541 [IWL_RATE_2M_INDEX] = "2M",
542 [IWL_RATE_5M_INDEX] = "5.5M",
543 [IWL_RATE_11M_INDEX] = "11M",
544 [IWL_RATE_6M_INDEX] = "6M",
545 [IWL_RATE_9M_INDEX] = "9M",
546 [IWL_RATE_12M_INDEX] = "12M",
547 [IWL_RATE_18M_INDEX] = "18M",
548 [IWL_RATE_24M_INDEX] = "24M",
549 [IWL_RATE_36M_INDEX] = "36M",
550 [IWL_RATE_48M_INDEX] = "48M",
551 [IWL_RATE_54M_INDEX] = "54M",
553 static const char *const ht_vht_rates[] = {
554 [IWL_RATE_MCS_0_INDEX] = "MCS0",
555 [IWL_RATE_MCS_1_INDEX] = "MCS1",
556 [IWL_RATE_MCS_2_INDEX] = "MCS2",
557 [IWL_RATE_MCS_3_INDEX] = "MCS3",
558 [IWL_RATE_MCS_4_INDEX] = "MCS4",
559 [IWL_RATE_MCS_5_INDEX] = "MCS5",
560 [IWL_RATE_MCS_6_INDEX] = "MCS6",
561 [IWL_RATE_MCS_7_INDEX] = "MCS7",
562 [IWL_RATE_MCS_8_INDEX] = "MCS8",
563 [IWL_RATE_MCS_9_INDEX] = "MCS9",
565 const char *rate_str;
567 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
568 rate_str = legacy_rates[rate->index];
569 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
570 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
571 (rate->index <= IWL_RATE_MCS_9_INDEX))
572 rate_str = ht_vht_rates[rate->index];
574 rate_str = "BAD_RATE";
576 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
577 rs_pretty_ant(rate->ant), rate_str);
581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
585 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
586 prefix, rs_pretty_rate(rate), rate->bw,
587 rate->sgi, rate->ldpc, rate->stbc);
590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
593 window->success_counter = 0;
594 window->success_ratio = IWL_INVALID_VALUE;
596 window->average_tpt = IWL_INVALID_VALUE;
599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
600 struct iwl_scale_tbl_info *tbl)
604 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
605 for (i = 0; i < IWL_RATE_COUNT; i++)
606 rs_rate_scale_clear_window(&tbl->win[i]);
608 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
609 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
614 return (ant_type & valid_antenna) == ant_type;
617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
618 struct iwl_lq_sta *lq_data, u8 tid,
619 struct ieee80211_sta *sta)
623 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
626 /* start BA session until the peer sends del BA */
627 ret = ieee80211_start_tx_ba_session(sta, tid, 0);
628 if (ret == -EAGAIN) {
630 * driver and mac80211 is out of sync
631 * this might be cause by reloading firmware
632 * stop the tx ba session here
634 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
636 ieee80211_stop_tx_ba_session(sta, tid);
641 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
642 u8 tid, struct iwl_lq_sta *lq_sta,
643 struct ieee80211_sta *sta)
645 struct iwl_mvm_tid_data *tid_data;
648 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
649 * when the frame is not QoS
651 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
652 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
653 tid, IWL_MAX_TID_COUNT);
655 } else if (tid == IWL_MAX_TID_COUNT) {
659 tid_data = &mvmsta->tid_data[tid];
660 if ((tid_data->state == IWL_AGG_OFF) &&
661 (lq_sta->tx_agg_tid_en & BIT(tid)) &&
662 (tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
663 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
664 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
665 tid_data->state = IWL_AGG_QUEUED;
669 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
671 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
672 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
673 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
677 * Static function to get the expected throughput from an iwl_scale_tbl_info
678 * that wraps a NULL pointer check
680 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
682 if (tbl->expected_tpt)
683 return tbl->expected_tpt[rs_index];
688 * rs_collect_tx_data - Update the success/failure sliding window
690 * We keep a sliding window of the last 62 packets transmitted
691 * at this rate. window->data contains the bitmask of successful
694 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
695 struct iwl_scale_tbl_info *tbl,
696 int scale_index, int attempts, int successes,
697 struct iwl_rate_scale_data *window)
699 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
702 /* Get expected throughput */
703 tpt = get_expected_tpt(tbl, scale_index);
706 * Keep track of only the latest 62 tx frame attempts in this rate's
707 * history window; anything older isn't really relevant any more.
708 * If we have filled up the sliding window, drop the oldest attempt;
709 * if the oldest attempt (highest bit in bitmap) shows "success",
710 * subtract "1" from the success counter (this is the main reason
711 * we keep these bitmaps!).
713 while (attempts > 0) {
714 if (window->counter >= IWL_RATE_MAX_WINDOW) {
715 /* remove earliest */
716 window->counter = IWL_RATE_MAX_WINDOW - 1;
718 if (window->data & mask) {
719 window->data &= ~mask;
720 window->success_counter--;
724 /* Increment frames-attempted counter */
727 /* Shift bitmap by one frame to throw away oldest history */
730 /* Mark the most recent #successes attempts as successful */
732 window->success_counter++;
740 /* Calculate current success ratio, avoid divide-by-0! */
741 if (window->counter > 0)
742 window->success_ratio = 128 * (100 * window->success_counter)
745 window->success_ratio = IWL_INVALID_VALUE;
747 fail_count = window->counter - window->success_counter;
749 /* Calculate average throughput, if we have enough history. */
750 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
751 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
752 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
754 window->average_tpt = IWL_INVALID_VALUE;
759 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
760 struct iwl_lq_sta *lq_sta,
761 struct iwl_scale_tbl_info *tbl,
762 int scale_index, int attempts, int successes,
765 struct iwl_rate_scale_data *window = NULL;
767 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
770 window = &tbl->tpc_win[reduced_txp];
771 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
775 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
776 struct iwl_mvm_sta *mvmsta,
777 u8 tid, int successes)
779 struct iwl_mvm_tid_data *tid_data;
781 if (tid >= IWL_MAX_TID_COUNT)
784 tid_data = &mvmsta->tid_data[tid];
787 * Measure if there're enough successful transmits per second.
788 * These statistics are used only to decide if we can start a
789 * BA session, so it should be updated only when A-MPDU is
792 if (tid_data->state != IWL_AGG_OFF)
795 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
796 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
797 tid_data->tx_count_last = tid_data->tx_count;
798 tid_data->tx_count = 0;
799 tid_data->tpt_meas_start = jiffies;
801 tid_data->tx_count += successes;
805 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
806 struct iwl_mvm_sta *mvmsta, u8 tid,
807 struct iwl_scale_tbl_info *tbl,
808 int scale_index, int attempts, int successes)
810 struct iwl_rate_scale_data *window = NULL;
812 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
815 if (tbl->column != RS_COLUMN_INVALID) {
816 struct lq_sta_pers *pers = &mvmsta->lq_sta.pers;
818 pers->tx_stats[tbl->column][scale_index].total += attempts;
819 pers->tx_stats[tbl->column][scale_index].success += successes;
822 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
824 /* Select window for current tx bit rate */
825 window = &(tbl->win[scale_index]);
826 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
830 /* Convert rs_rate object into ucode rate bitmask */
831 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
832 struct rs_rate *rate)
835 int index = rate->index;
837 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
838 RATE_MCS_ANT_ABC_MSK);
840 if (is_legacy(rate)) {
841 ucode_rate |= iwl_rates[index].plcp;
842 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
843 ucode_rate |= RATE_MCS_CCK_MSK;
848 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
849 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
850 index = IWL_LAST_HT_RATE;
852 ucode_rate |= RATE_MCS_HT_MSK;
854 if (is_ht_siso(rate))
855 ucode_rate |= iwl_rates[index].plcp_ht_siso;
856 else if (is_ht_mimo2(rate))
857 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
860 } else if (is_vht(rate)) {
861 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
862 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
863 index = IWL_LAST_VHT_RATE;
865 ucode_rate |= RATE_MCS_VHT_MSK;
866 if (is_vht_siso(rate))
867 ucode_rate |= iwl_rates[index].plcp_vht_siso;
868 else if (is_vht_mimo2(rate))
869 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
874 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
877 if (is_siso(rate) && rate->stbc) {
878 /* To enable STBC we need to set both a flag and ANT_AB */
879 ucode_rate |= RATE_MCS_ANT_AB_MSK;
880 ucode_rate |= RATE_MCS_STBC_MSK;
883 ucode_rate |= rate->bw;
885 ucode_rate |= RATE_MCS_SGI_MSK;
887 ucode_rate |= RATE_MCS_LDPC_MSK;
892 /* Convert a ucode rate into an rs_rate object */
893 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
894 enum nl80211_band band,
895 struct rs_rate *rate)
897 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
898 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
901 memset(rate, 0, sizeof(*rate));
902 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
904 if (rate->index == IWL_RATE_INVALID)
907 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
910 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
911 !(ucode_rate & RATE_MCS_VHT_MSK)) {
912 if (num_of_ant == 1) {
913 if (band == NL80211_BAND_5GHZ)
914 rate->type = LQ_LEGACY_A;
916 rate->type = LQ_LEGACY_G;
923 if (ucode_rate & RATE_MCS_SGI_MSK)
925 if (ucode_rate & RATE_MCS_LDPC_MSK)
927 if (ucode_rate & RATE_MCS_STBC_MSK)
929 if (ucode_rate & RATE_MCS_BF_MSK)
932 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
934 if (ucode_rate & RATE_MCS_HT_MSK) {
935 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
936 RATE_HT_MCS_NSS_POS) + 1;
939 rate->type = LQ_HT_SISO;
940 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
942 rate->stbc, rate->bfer);
943 } else if (nss == 2) {
944 rate->type = LQ_HT_MIMO2;
945 WARN_ON_ONCE(num_of_ant != 2);
949 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
950 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
951 RATE_VHT_MCS_NSS_POS) + 1;
954 rate->type = LQ_VHT_SISO;
955 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
957 rate->stbc, rate->bfer);
958 } else if (nss == 2) {
959 rate->type = LQ_VHT_MIMO2;
960 WARN_ON_ONCE(num_of_ant != 2);
966 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
972 /* switch to another antenna/antennas and return 1 */
973 /* if no other valid antenna found, return 0 */
974 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
978 if (!rate->ant || rate->ant > ANT_ABC)
981 if (!rs_is_valid_ant(valid_ant, rate->ant))
984 new_ant_type = ant_toggle_lookup[rate->ant];
986 while ((new_ant_type != rate->ant) &&
987 !rs_is_valid_ant(valid_ant, new_ant_type))
988 new_ant_type = ant_toggle_lookup[new_ant_type];
990 if (new_ant_type == rate->ant)
993 rate->ant = new_ant_type;
998 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
999 struct rs_rate *rate)
1001 if (is_legacy(rate))
1002 return lq_sta->active_legacy_rate;
1003 else if (is_siso(rate))
1004 return lq_sta->active_siso_rate;
1005 else if (is_mimo2(rate))
1006 return lq_sta->active_mimo2_rate;
1012 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1015 u8 high = IWL_RATE_INVALID;
1016 u8 low = IWL_RATE_INVALID;
1018 /* 802.11A or ht walks to the next literal adjacent rate in
1020 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1024 /* Find the previous rate that is in the rate mask */
1028 for (; i >= 0; i--, mask >>= 1) {
1029 if (rate_mask & mask) {
1035 /* Find the next rate that is in the rate mask */
1037 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1038 if (rate_mask & mask) {
1044 return (high << 8) | low;
1048 while (low != IWL_RATE_INVALID) {
1049 low = iwl_rates[low].prev_rs;
1050 if (low == IWL_RATE_INVALID)
1052 if (rate_mask & (1 << low))
1057 while (high != IWL_RATE_INVALID) {
1058 high = iwl_rates[high].next_rs;
1059 if (high == IWL_RATE_INVALID)
1061 if (rate_mask & (1 << high))
1065 return (high << 8) | low;
1068 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1069 struct rs_rate *rate)
1071 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1074 /* Get the next supported lower rate in the current column.
1075 * Return true if bottom rate in the current column was reached
1077 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1078 struct rs_rate *rate)
1083 struct iwl_mvm *mvm = lq_sta->pers.drv;
1085 rate_mask = rs_get_supported_rates(lq_sta, rate);
1086 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1088 low = high_low & 0xff;
1090 /* Bottom rate of column reached */
1091 if (low == IWL_RATE_INVALID)
1098 /* Get the next rate to use following a column downgrade */
1099 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1100 struct rs_rate *rate)
1102 struct iwl_mvm *mvm = lq_sta->pers.drv;
1104 if (is_legacy(rate)) {
1105 /* No column to downgrade from Legacy */
1107 } else if (is_siso(rate)) {
1108 /* Downgrade to Legacy if we were in SISO */
1109 if (lq_sta->band == NL80211_BAND_5GHZ)
1110 rate->type = LQ_LEGACY_A;
1112 rate->type = LQ_LEGACY_G;
1114 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1116 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1117 rate->index > IWL_RATE_MCS_9_INDEX);
1119 rate->index = rs_ht_to_legacy[rate->index];
1122 /* Downgrade to SISO with same MCS if in MIMO */
1123 rate->type = is_vht_mimo2(rate) ?
1124 LQ_VHT_SISO : LQ_HT_SISO;
1127 if (num_of_ant(rate->ant) > 1)
1128 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1130 /* Relevant in both switching to SISO or Legacy */
1133 if (!rs_rate_supported(lq_sta, rate))
1134 rs_get_lower_rate_in_column(lq_sta, rate);
1137 /* Check if both rates share the same column */
1138 static inline bool rs_rate_column_match(struct rs_rate *a,
1143 if (a->stbc || a->bfer)
1144 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1146 ant_match = (a->ant == b->ant);
1148 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1152 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1154 if (is_legacy(rate)) {
1155 if (rate->ant == ANT_A)
1156 return RS_COLUMN_LEGACY_ANT_A;
1158 if (rate->ant == ANT_B)
1159 return RS_COLUMN_LEGACY_ANT_B;
1164 if (is_siso(rate)) {
1165 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1166 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1167 RS_COLUMN_SISO_ANT_A;
1169 if (rate->ant == ANT_B)
1170 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1171 RS_COLUMN_SISO_ANT_B;
1177 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1180 return RS_COLUMN_INVALID;
1183 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1185 u8 tid = IWL_MAX_TID_COUNT;
1187 if (ieee80211_is_data_qos(hdr->frame_control)) {
1188 u8 *qc = ieee80211_get_qos_ctl(hdr);
1192 if (unlikely(tid > IWL_MAX_TID_COUNT))
1193 tid = IWL_MAX_TID_COUNT;
1198 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1199 int tid, struct ieee80211_tx_info *info, bool ndp)
1204 struct iwl_lq_cmd *table;
1206 struct rs_rate lq_rate, tx_resp_rate;
1207 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1208 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1209 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1210 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1211 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1212 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1213 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1215 /* Treat uninitialized rate scaling data same as non-existing. */
1217 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1219 } else if (!lq_sta->pers.drv) {
1220 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1224 /* This packet was aggregated but doesn't carry status info */
1225 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1226 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1229 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
1235 #ifdef CONFIG_MAC80211_DEBUGFS
1236 /* Disable last tx check if we are debugging with fixed rate but
1237 * update tx stats */
1238 if (lq_sta->pers.dbg_fixed_rate) {
1239 int index = tx_resp_rate.index;
1240 enum rs_column column;
1241 int attempts, success;
1243 column = rs_get_column_from_rate(&tx_resp_rate);
1244 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1245 "Can't map rate 0x%x to column",
1249 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1250 attempts = info->status.ampdu_len;
1251 success = info->status.ampdu_ack_len;
1253 attempts = info->status.rates[0].count;
1254 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1257 lq_sta->pers.tx_stats[column][index].total += attempts;
1258 lq_sta->pers.tx_stats[column][index].success += success;
1260 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1261 tx_resp_hwrate, success, attempts);
1266 if (time_after(jiffies,
1267 (unsigned long)(lq_sta->last_tx +
1268 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1269 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1270 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1273 lq_sta->last_tx = jiffies;
1275 /* Ignore this Tx frame response if its initial rate doesn't match
1276 * that of latest Link Quality command. There may be stragglers
1277 * from a previous Link Quality command, but we're no longer interested
1278 * in those; they're either from the "active" mode while we're trying
1279 * to check "search" mode, or a prior "search" mode after we've moved
1280 * to a new "search" mode (which might become the new "active" mode).
1282 table = &lq_sta->lq;
1283 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1284 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
1289 /* Here we actually compare this rate to the latest LQ command */
1290 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1292 "tx resp color 0x%x does not match 0x%x\n",
1293 lq_color, LQ_FLAG_COLOR_GET(table->flags));
1296 * Since rates mis-match, the last LQ command may have failed.
1297 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1300 lq_sta->missed_rate_counter++;
1301 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1302 lq_sta->missed_rate_counter = 0;
1304 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1306 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1308 /* Regardless, ignore this status info for outdated rate */
1311 /* Rate did match, so reset the missed_rate_counter */
1312 lq_sta->missed_rate_counter = 0;
1314 if (!lq_sta->search_better_tbl) {
1315 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1316 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1318 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1319 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1322 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1324 "Neither active nor search matches tx rate\n");
1325 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1326 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1327 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1328 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1329 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1332 * no matching table found, let's by-pass the data collection
1333 * and continue to perform rate scale to find the rate table
1335 rs_stay_in_table(lq_sta, true);
1340 * Updating the frame history depends on whether packets were
1343 * For aggregation, all packets were transmitted at the same rate, the
1344 * first index into rate scale table.
1346 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1347 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1348 info->status.ampdu_len,
1349 info->status.ampdu_ack_len,
1352 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1353 * it as a single frame loss as we don't want the success ratio
1354 * to dip too quickly because a BA wasn't received.
1355 * For TPC, there's no need for this optimisation since we want
1356 * to recover very quickly from a bad power reduction and,
1357 * therefore we'd like the success ratio to get an immediate hit
1358 * when failing to get a BA, so we'd switch back to a lower or
1359 * zero power reduction. When FW transmits agg with a rate
1360 * different from the initial rate, it will not use reduced txp
1361 * and will send BA notification twice (one empty with reduced
1362 * txp equal to the value from LQ and one with reduced txp 0).
1363 * We need to update counters for each txp level accordingly.
1365 if (info->status.ampdu_ack_len == 0)
1366 info->status.ampdu_len = 1;
1368 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index,
1369 info->status.ampdu_len,
1370 info->status.ampdu_ack_len);
1372 /* Update success/fail counts if not searching for new mode */
1373 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1374 lq_sta->total_success += info->status.ampdu_ack_len;
1375 lq_sta->total_failed += (info->status.ampdu_len -
1376 info->status.ampdu_ack_len);
1379 /* For legacy, update frame history with for each Tx retry. */
1380 retries = info->status.rates[0].count - 1;
1381 /* HW doesn't send more than 15 retries */
1382 retries = min(retries, 15);
1384 /* The last transmission may have been successful */
1385 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1386 /* Collect data for each rate used during failed TX attempts */
1387 for (i = 0; i <= retries; ++i) {
1388 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1389 if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
1396 * Only collect stats if retried rate is in the same RS
1397 * table as active/search.
1399 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1401 else if (rs_rate_column_match(&lq_rate,
1403 tmp_tbl = other_tbl;
1407 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1408 tx_resp_rate.index, 1,
1409 i < retries ? 0 : legacy_success,
1411 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
1412 tx_resp_rate.index, 1,
1413 i < retries ? 0 : legacy_success);
1416 /* Update success/fail counts if not searching for new mode */
1417 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1418 lq_sta->total_success += legacy_success;
1419 lq_sta->total_failed += retries + (1 - legacy_success);
1422 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1423 lq_sta->last_rate_n_flags = lq_hwrate;
1424 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1426 /* See if there's a better rate or modulation mode to try. */
1427 if (sta->supp_rates[info->band])
1428 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1432 * mac80211 sends us Tx status
1434 static void rs_mac80211_tx_status(void *mvm_r,
1435 struct ieee80211_supported_band *sband,
1436 struct ieee80211_sta *sta, void *priv_sta,
1437 struct sk_buff *skb)
1439 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1440 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1441 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1442 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1444 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1447 if (!ieee80211_is_data(hdr->frame_control) ||
1448 info->flags & IEEE80211_TX_CTL_NO_ACK)
1451 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1452 ieee80211_is_qos_nullfunc(hdr->frame_control));
1456 * Begin a period of staying with a selected modulation mode.
1457 * Set "stay_in_tbl" flag to prevent any mode switches.
1458 * Set frame tx success limits according to legacy vs. high-throughput,
1459 * and reset overall (spanning all rates) tx success history statistics.
1460 * These control how long we stay using same modulation mode before
1461 * searching for a new mode.
1463 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1464 struct iwl_lq_sta *lq_sta)
1466 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1467 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1469 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1470 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1471 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1473 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1474 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1475 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1477 lq_sta->table_count = 0;
1478 lq_sta->total_failed = 0;
1479 lq_sta->total_success = 0;
1480 lq_sta->flush_timer = jiffies;
1481 lq_sta->visited_columns = 0;
1484 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1487 return find_last_bit(&rate_mask, BITS_PER_LONG);
1488 return IWL_RATE_INVALID;
1491 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1492 const struct rs_tx_column *column)
1494 switch (column->mode) {
1496 return lq_sta->max_legacy_rate_idx;
1498 return lq_sta->max_siso_rate_idx;
1500 return lq_sta->max_mimo2_rate_idx;
1505 return lq_sta->max_legacy_rate_idx;
1508 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1509 const struct rs_tx_column *column,
1512 /* Used to choose among HT tables */
1513 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1515 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1516 column->mode != RS_SISO &&
1517 column->mode != RS_MIMO2))
1518 return expected_tpt_legacy;
1520 /* Legacy rates have only one table */
1521 if (column->mode == RS_LEGACY)
1522 return expected_tpt_legacy;
1524 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1525 /* Choose among many HT tables depending on number of streams
1526 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1528 if (column->mode == RS_SISO) {
1530 case RATE_MCS_CHAN_WIDTH_20:
1531 ht_tbl_pointer = expected_tpt_siso_20MHz;
1533 case RATE_MCS_CHAN_WIDTH_40:
1534 ht_tbl_pointer = expected_tpt_siso_40MHz;
1536 case RATE_MCS_CHAN_WIDTH_80:
1537 ht_tbl_pointer = expected_tpt_siso_80MHz;
1539 case RATE_MCS_CHAN_WIDTH_160:
1540 ht_tbl_pointer = expected_tpt_siso_160MHz;
1545 } else if (column->mode == RS_MIMO2) {
1547 case RATE_MCS_CHAN_WIDTH_20:
1548 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1550 case RATE_MCS_CHAN_WIDTH_40:
1551 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1553 case RATE_MCS_CHAN_WIDTH_80:
1554 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1556 case RATE_MCS_CHAN_WIDTH_160:
1557 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1566 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1567 return ht_tbl_pointer[0];
1568 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1569 return ht_tbl_pointer[1];
1570 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1571 return ht_tbl_pointer[2];
1573 return ht_tbl_pointer[3];
1576 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1577 struct iwl_scale_tbl_info *tbl)
1579 struct rs_rate *rate = &tbl->rate;
1580 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1582 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1585 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1586 struct iwl_lq_sta *lq_sta,
1587 struct iwl_scale_tbl_info *tbl, /* "search" */
1588 unsigned long rate_mask, s8 index)
1590 struct iwl_scale_tbl_info *active_tbl =
1591 &(lq_sta->lq_info[lq_sta->active_tbl]);
1592 s32 success_ratio = active_tbl->win[index].success_ratio;
1593 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1594 const u16 *tpt_tbl = tbl->expected_tpt;
1599 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1600 target_tpt = 100 * expected_current_tpt;
1602 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1603 success_ratio, target_tpt);
1605 target_tpt = lq_sta->last_tpt;
1607 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1608 success_ratio, target_tpt);
1611 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1613 while (rate_idx != IWL_RATE_INVALID) {
1614 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1617 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1620 rate_idx = (high_low >> 8) & 0xff;
1623 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1624 rate_idx, target_tpt,
1625 rate_idx != IWL_RATE_INVALID ?
1626 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1631 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1633 switch (sta->bandwidth) {
1634 case IEEE80211_STA_RX_BW_160:
1635 return RATE_MCS_CHAN_WIDTH_160;
1636 case IEEE80211_STA_RX_BW_80:
1637 return RATE_MCS_CHAN_WIDTH_80;
1638 case IEEE80211_STA_RX_BW_40:
1639 return RATE_MCS_CHAN_WIDTH_40;
1640 case IEEE80211_STA_RX_BW_20:
1642 return RATE_MCS_CHAN_WIDTH_20;
1647 * Check whether we should continue using same modulation mode, or
1648 * begin search for a new mode, based on:
1649 * 1) # tx successes or failures while using this mode
1650 * 2) # times calling this function
1651 * 3) elapsed time in this mode (not used, for now)
1653 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1655 struct iwl_scale_tbl_info *tbl;
1657 int flush_interval_passed = 0;
1658 struct iwl_mvm *mvm;
1660 mvm = lq_sta->pers.drv;
1661 active_tbl = lq_sta->active_tbl;
1663 tbl = &(lq_sta->lq_info[active_tbl]);
1665 /* If we've been disallowing search, see if we should now allow it */
1666 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1667 /* Elapsed time using current modulation mode */
1668 if (lq_sta->flush_timer)
1669 flush_interval_passed =
1671 (unsigned long)(lq_sta->flush_timer +
1672 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1675 * Check if we should allow search for new modulation mode.
1676 * If many frames have failed or succeeded, or we've used
1677 * this same modulation for a long time, allow search, and
1678 * reset history stats that keep track of whether we should
1679 * allow a new search. Also (below) reset all bitmaps and
1680 * stats in active history.
1683 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1684 (lq_sta->total_success > lq_sta->max_success_limit) ||
1685 ((!lq_sta->search_better_tbl) &&
1686 (lq_sta->flush_timer) && (flush_interval_passed))) {
1688 "LQ: stay is expired %d %d %d\n",
1689 lq_sta->total_failed,
1690 lq_sta->total_success,
1691 flush_interval_passed);
1693 /* Allow search for new mode */
1694 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1696 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1697 lq_sta->total_failed = 0;
1698 lq_sta->total_success = 0;
1699 lq_sta->flush_timer = 0;
1700 /* mark the current column as visited */
1701 lq_sta->visited_columns = BIT(tbl->column);
1703 * Else if we've used this modulation mode enough repetitions
1704 * (regardless of elapsed time or success/failure), reset
1705 * history bitmaps and rate-specific stats for all rates in
1709 lq_sta->table_count++;
1710 if (lq_sta->table_count >=
1711 lq_sta->table_count_limit) {
1712 lq_sta->table_count = 0;
1715 "LQ: stay in table clear win\n");
1716 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1720 /* If transitioning to allow "search", reset all history
1721 * bitmaps and stats in active table (this will become the new
1722 * "search" table). */
1723 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1724 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1729 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1730 struct iwl_scale_tbl_info *tbl,
1731 enum rs_action scale_action)
1733 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1735 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1736 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1737 scale_action == RS_ACTION_DOWNSCALE)
1738 mvmsta->tlc_amsdu = false;
1740 mvmsta->tlc_amsdu = true;
1744 * setup rate table in uCode
1746 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1747 struct ieee80211_sta *sta,
1748 struct iwl_lq_sta *lq_sta,
1749 struct iwl_scale_tbl_info *tbl)
1751 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1752 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1755 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1756 struct ieee80211_sta *sta,
1757 struct iwl_lq_sta *lq_sta,
1758 struct iwl_scale_tbl_info *tbl,
1759 enum rs_action scale_action)
1761 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1764 if (!is_vht_siso(&tbl->rate))
1767 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1768 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1769 (scale_action == RS_ACTION_DOWNSCALE)) {
1770 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1771 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1772 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1776 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1777 * sustainable, i.e. we're past the test window. We can't go back
1778 * if MCS5 is just tested as this will happen always after switching
1779 * to 20Mhz MCS4 because the rate stats are cleared.
1781 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1782 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1783 (scale_action == RS_ACTION_STAY)) ||
1784 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1785 (scale_action == RS_ACTION_UPSCALE)))) {
1786 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1787 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1788 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1795 rs_set_expected_tpt_table(lq_sta, tbl);
1796 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1800 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1801 struct iwl_lq_sta *lq_sta,
1802 struct ieee80211_sta *sta,
1803 struct iwl_scale_tbl_info *tbl)
1806 enum rs_column next_col_id;
1807 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1808 const struct rs_tx_column *next_col;
1809 allow_column_func_t allow_func;
1810 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1811 const u16 *expected_tpt_tbl;
1812 u16 tpt, max_expected_tpt;
1814 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1815 next_col_id = curr_col->next_columns[i];
1817 if (next_col_id == RS_COLUMN_INVALID)
1820 if (lq_sta->visited_columns & BIT(next_col_id)) {
1821 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1826 next_col = &rs_tx_columns[next_col_id];
1828 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1830 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1831 next_col_id, valid_ants, next_col->ant);
1835 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1836 allow_func = next_col->checks[j];
1837 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1842 if (j != MAX_COLUMN_CHECKS) {
1844 "Skip column %d: not allowed (check %d failed)\n",
1850 tpt = lq_sta->last_tpt / 100;
1851 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1852 rs_bw_from_sta_bw(sta));
1853 if (WARN_ON_ONCE(!expected_tpt_tbl))
1856 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1857 if (max_rate == IWL_RATE_INVALID) {
1859 "Skip column %d: no rate is allowed in this column\n",
1864 max_expected_tpt = expected_tpt_tbl[max_rate];
1865 if (tpt >= max_expected_tpt) {
1867 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1868 next_col_id, max_expected_tpt, tpt);
1873 "Found potential column %d. Max expected %d current %d\n",
1874 next_col_id, max_expected_tpt, tpt);
1878 if (i == MAX_NEXT_COLUMNS)
1879 return RS_COLUMN_INVALID;
1884 static int rs_switch_to_column(struct iwl_mvm *mvm,
1885 struct iwl_lq_sta *lq_sta,
1886 struct ieee80211_sta *sta,
1887 enum rs_column col_id)
1889 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1890 struct iwl_scale_tbl_info *search_tbl =
1891 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1892 struct rs_rate *rate = &search_tbl->rate;
1893 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1894 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1895 unsigned long rate_mask = 0;
1898 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1900 rate->sgi = column->sgi;
1901 rate->ant = column->ant;
1903 if (column->mode == RS_LEGACY) {
1904 if (lq_sta->band == NL80211_BAND_5GHZ)
1905 rate->type = LQ_LEGACY_A;
1907 rate->type = LQ_LEGACY_G;
1909 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1911 rate_mask = lq_sta->active_legacy_rate;
1912 } else if (column->mode == RS_SISO) {
1913 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1914 rate_mask = lq_sta->active_siso_rate;
1915 } else if (column->mode == RS_MIMO2) {
1916 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1917 rate_mask = lq_sta->active_mimo2_rate;
1919 WARN_ONCE(1, "Bad column mode");
1922 if (column->mode != RS_LEGACY) {
1923 rate->bw = rs_bw_from_sta_bw(sta);
1924 rate->ldpc = lq_sta->ldpc;
1927 search_tbl->column = col_id;
1928 rs_set_expected_tpt_table(lq_sta, search_tbl);
1930 lq_sta->visited_columns |= BIT(col_id);
1932 /* Get the best matching rate if we're changing modes. e.g.
1933 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1935 if (curr_column->mode != column->mode) {
1936 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1937 rate_mask, rate->index);
1939 if ((rate_idx == IWL_RATE_INVALID) ||
1940 !(BIT(rate_idx) & rate_mask)) {
1942 "can not switch with index %d"
1944 rate_idx, rate_mask);
1949 rate->index = rate_idx;
1952 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1953 col_id, rate->index);
1958 rate->type = LQ_NONE;
1962 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1963 struct iwl_scale_tbl_info *tbl,
1964 s32 sr, int low, int high,
1966 int low_tpt, int high_tpt)
1968 enum rs_action action = RS_ACTION_STAY;
1970 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1971 (current_tpt == 0)) {
1973 "Decrease rate because of low SR\n");
1974 return RS_ACTION_DOWNSCALE;
1977 if ((low_tpt == IWL_INVALID_VALUE) &&
1978 (high_tpt == IWL_INVALID_VALUE) &&
1979 (high != IWL_RATE_INVALID)) {
1981 "No data about high/low rates. Increase rate\n");
1982 return RS_ACTION_UPSCALE;
1985 if ((high_tpt == IWL_INVALID_VALUE) &&
1986 (high != IWL_RATE_INVALID) &&
1987 (low_tpt != IWL_INVALID_VALUE) &&
1988 (low_tpt < current_tpt)) {
1990 "No data about high rate and low rate is worse. Increase rate\n");
1991 return RS_ACTION_UPSCALE;
1994 if ((high_tpt != IWL_INVALID_VALUE) &&
1995 (high_tpt > current_tpt)) {
1997 "Higher rate is better. Increate rate\n");
1998 return RS_ACTION_UPSCALE;
2001 if ((low_tpt != IWL_INVALID_VALUE) &&
2002 (high_tpt != IWL_INVALID_VALUE) &&
2003 (low_tpt < current_tpt) &&
2004 (high_tpt < current_tpt)) {
2006 "Both high and low are worse. Maintain rate\n");
2007 return RS_ACTION_STAY;
2010 if ((low_tpt != IWL_INVALID_VALUE) &&
2011 (low_tpt > current_tpt)) {
2013 "Lower rate is better\n");
2014 action = RS_ACTION_DOWNSCALE;
2018 if ((low_tpt == IWL_INVALID_VALUE) &&
2019 (low != IWL_RATE_INVALID)) {
2021 "No data about lower rate\n");
2022 action = RS_ACTION_DOWNSCALE;
2026 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2029 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2030 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2032 "SR is above NO DECREASE. Avoid downscale\n");
2033 action = RS_ACTION_STAY;
2034 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2036 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2037 action = RS_ACTION_STAY;
2039 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2046 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2047 struct iwl_lq_sta *lq_sta)
2049 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2050 * supports STBC of at least 1*SS
2052 if (!lq_sta->stbc_capable)
2055 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2061 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2062 int *weaker, int *stronger)
2064 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2065 if (*weaker > TPC_MAX_REDUCTION)
2066 *weaker = TPC_INVALID;
2068 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2070 *stronger = TPC_INVALID;
2073 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2074 struct rs_rate *rate, enum nl80211_band band)
2076 int index = rate->index;
2077 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2078 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2081 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2082 cam, sta_ps_disabled);
2084 * allow tpc only if power management is enabled, or bt coex
2085 * activity grade allows it and we are on 2.4Ghz.
2087 if ((cam || sta_ps_disabled) &&
2088 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2091 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2092 if (is_legacy(rate))
2093 return index == IWL_RATE_54M_INDEX;
2095 return index == IWL_RATE_MCS_7_INDEX;
2097 return index == IWL_RATE_MCS_7_INDEX ||
2098 index == IWL_RATE_MCS_8_INDEX ||
2099 index == IWL_RATE_MCS_9_INDEX;
2107 TPC_ACTION_DECREASE,
2108 TPC_ACTION_INCREASE,
2109 TPC_ACTION_NO_RESTIRCTION,
2112 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2113 s32 sr, int weak, int strong,
2115 int weak_tpt, int strong_tpt)
2117 /* stay until we have valid tpt */
2118 if (current_tpt == IWL_INVALID_VALUE) {
2119 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2120 return TPC_ACTION_STAY;
2123 /* Too many failures, increase txp */
2124 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2126 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2127 return TPC_ACTION_NO_RESTIRCTION;
2130 /* try decreasing first if applicable */
2131 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2132 weak != TPC_INVALID) {
2133 if (weak_tpt == IWL_INVALID_VALUE &&
2134 (strong_tpt == IWL_INVALID_VALUE ||
2135 current_tpt >= strong_tpt)) {
2137 "no weak txp measurement. decrease txp\n");
2138 return TPC_ACTION_DECREASE;
2141 if (weak_tpt > current_tpt) {
2143 "lower txp has better tpt. decrease txp\n");
2144 return TPC_ACTION_DECREASE;
2148 /* next, increase if needed */
2149 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2150 strong != TPC_INVALID) {
2151 if (weak_tpt == IWL_INVALID_VALUE &&
2152 strong_tpt != IWL_INVALID_VALUE &&
2153 current_tpt < strong_tpt) {
2155 "higher txp has better tpt. increase txp\n");
2156 return TPC_ACTION_INCREASE;
2159 if (weak_tpt < current_tpt &&
2160 (strong_tpt == IWL_INVALID_VALUE ||
2161 strong_tpt > current_tpt)) {
2163 "lower txp has worse tpt. increase txp\n");
2164 return TPC_ACTION_INCREASE;
2168 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2169 return TPC_ACTION_STAY;
2172 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2173 struct ieee80211_sta *sta,
2174 struct iwl_lq_sta *lq_sta,
2175 struct iwl_scale_tbl_info *tbl)
2177 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2178 struct ieee80211_vif *vif = mvm_sta->vif;
2179 struct ieee80211_chanctx_conf *chanctx_conf;
2180 enum nl80211_band band;
2181 struct iwl_rate_scale_data *window;
2182 struct rs_rate *rate = &tbl->rate;
2183 enum tpc_action action;
2185 u8 cur = lq_sta->lq.reduced_tpc;
2188 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2190 #ifdef CONFIG_MAC80211_DEBUGFS
2191 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2192 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2193 lq_sta->pers.dbg_fixed_txp_reduction);
2194 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2195 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2200 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2201 if (WARN_ON(!chanctx_conf))
2202 band = NUM_NL80211_BANDS;
2204 band = chanctx_conf->def.chan->band;
2207 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2209 "tpc is not allowed. remove txp restrictions\n");
2210 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2211 return cur != TPC_NO_REDUCTION;
2214 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2216 /* Collect measured throughputs for current and adjacent rates */
2217 window = tbl->tpc_win;
2218 sr = window[cur].success_ratio;
2219 current_tpt = window[cur].average_tpt;
2220 if (weak != TPC_INVALID)
2221 weak_tpt = window[weak].average_tpt;
2222 if (strong != TPC_INVALID)
2223 strong_tpt = window[strong].average_tpt;
2226 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2227 cur, current_tpt, sr, weak, strong,
2228 weak_tpt, strong_tpt);
2230 action = rs_get_tpc_action(mvm, sr, weak, strong,
2231 current_tpt, weak_tpt, strong_tpt);
2233 /* override actions if we are on the edge */
2234 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2235 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2236 action = TPC_ACTION_STAY;
2237 } else if (strong == TPC_INVALID &&
2238 (action == TPC_ACTION_INCREASE ||
2239 action == TPC_ACTION_NO_RESTIRCTION)) {
2240 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2241 action = TPC_ACTION_STAY;
2245 case TPC_ACTION_DECREASE:
2246 lq_sta->lq.reduced_tpc = weak;
2248 case TPC_ACTION_INCREASE:
2249 lq_sta->lq.reduced_tpc = strong;
2251 case TPC_ACTION_NO_RESTIRCTION:
2252 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2254 case TPC_ACTION_STAY:
2262 * Do rate scaling and search for new modulation mode.
2264 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2265 struct ieee80211_sta *sta,
2266 struct iwl_lq_sta *lq_sta,
2269 int low = IWL_RATE_INVALID;
2270 int high = IWL_RATE_INVALID;
2272 struct iwl_rate_scale_data *window = NULL;
2273 int current_tpt = IWL_INVALID_VALUE;
2274 int low_tpt = IWL_INVALID_VALUE;
2275 int high_tpt = IWL_INVALID_VALUE;
2277 enum rs_action scale_action = RS_ACTION_STAY;
2280 struct iwl_scale_tbl_info *tbl, *tbl1;
2285 u8 prev_agg = lq_sta->is_agg;
2286 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2287 struct rs_rate *rate;
2289 lq_sta->is_agg = !!mvmsta->agg_tids;
2292 * Select rate-scale / modulation-mode table to work with in
2293 * the rest of this function: "search" if searching for better
2294 * modulation mode, or "active" if doing rate scaling within a mode.
2296 if (!lq_sta->search_better_tbl)
2297 active_tbl = lq_sta->active_tbl;
2299 active_tbl = 1 - lq_sta->active_tbl;
2301 tbl = &(lq_sta->lq_info[active_tbl]);
2304 if (prev_agg != lq_sta->is_agg) {
2306 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2307 prev_agg, lq_sta->is_agg);
2308 rs_set_expected_tpt_table(lq_sta, tbl);
2309 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2312 /* current tx rate */
2313 index = rate->index;
2315 /* rates available for this association, and for modulation mode */
2316 rate_mask = rs_get_supported_rates(lq_sta, rate);
2318 if (!(BIT(index) & rate_mask)) {
2319 IWL_ERR(mvm, "Current Rate is not valid\n");
2320 if (lq_sta->search_better_tbl) {
2321 /* revert to active table if search table is not valid*/
2322 rate->type = LQ_NONE;
2323 lq_sta->search_better_tbl = 0;
2324 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2325 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2330 /* Get expected throughput table and history window for current rate */
2331 if (!tbl->expected_tpt) {
2332 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2336 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2337 window = &(tbl->win[index]);
2340 * If there is not enough history to calculate actual average
2341 * throughput, keep analyzing results of more tx frames, without
2342 * changing rate or mode (bypass most of the rest of this function).
2343 * Set up new rate table in uCode only if old rate is not supported
2344 * in current association (use new rate found above).
2346 fail_count = window->counter - window->success_counter;
2347 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2348 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2350 "%s: Test Window: succ %d total %d\n",
2351 rs_pretty_rate(rate),
2352 window->success_counter, window->counter);
2354 /* Can't calculate this yet; not enough history */
2355 window->average_tpt = IWL_INVALID_VALUE;
2357 /* Should we stay with this modulation mode,
2358 * or search for a new one? */
2359 rs_stay_in_table(lq_sta, false);
2364 /* If we are searching for better modulation mode, check success. */
2365 if (lq_sta->search_better_tbl) {
2366 /* If good success, continue using the "search" mode;
2367 * no need to send new link quality command, since we're
2368 * continuing to use the setup that we've been trying. */
2369 if (window->average_tpt > lq_sta->last_tpt) {
2371 "SWITCHING TO NEW TABLE SR: %d "
2372 "cur-tpt %d old-tpt %d\n",
2373 window->success_ratio,
2374 window->average_tpt,
2377 /* Swap tables; "search" becomes "active" */
2378 lq_sta->active_tbl = active_tbl;
2379 current_tpt = window->average_tpt;
2380 /* Else poor success; go back to mode in "active" table */
2383 "GOING BACK TO THE OLD TABLE: SR %d "
2384 "cur-tpt %d old-tpt %d\n",
2385 window->success_ratio,
2386 window->average_tpt,
2389 /* Nullify "search" table */
2390 rate->type = LQ_NONE;
2392 /* Revert to "active" table */
2393 active_tbl = lq_sta->active_tbl;
2394 tbl = &(lq_sta->lq_info[active_tbl]);
2396 /* Revert to "active" rate and throughput info */
2397 index = tbl->rate.index;
2398 current_tpt = lq_sta->last_tpt;
2400 /* Need to set up a new rate table in uCode */
2404 /* Either way, we've made a decision; modulation mode
2405 * search is done, allow rate adjustment next time. */
2406 lq_sta->search_better_tbl = 0;
2407 done_search = 1; /* Don't switch modes below! */
2411 /* (Else) not in search of better modulation mode, try for better
2412 * starting rate, while staying in this mode. */
2413 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2414 low = high_low & 0xff;
2415 high = (high_low >> 8) & 0xff;
2417 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2419 sr = window->success_ratio;
2421 /* Collect measured throughputs for current and adjacent rates */
2422 current_tpt = window->average_tpt;
2423 if (low != IWL_RATE_INVALID)
2424 low_tpt = tbl->win[low].average_tpt;
2425 if (high != IWL_RATE_INVALID)
2426 high_tpt = tbl->win[high].average_tpt;
2429 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2430 rs_pretty_rate(rate), current_tpt, sr,
2431 low, high, low_tpt, high_tpt);
2433 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2434 current_tpt, low_tpt, high_tpt);
2436 /* Force a search in case BT doesn't like us being in MIMO */
2437 if (is_mimo(rate) &&
2438 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2440 "BT Coex forbids MIMO. Search for new config\n");
2441 rs_stay_in_table(lq_sta, true);
2445 switch (scale_action) {
2446 case RS_ACTION_DOWNSCALE:
2447 /* Decrease starting rate, update uCode's rate table */
2448 if (low != IWL_RATE_INVALID) {
2453 "At the bottom rate. Can't decrease\n");
2457 case RS_ACTION_UPSCALE:
2458 /* Increase starting rate, update uCode's rate table */
2459 if (high != IWL_RATE_INVALID) {
2464 "At the top rate. Can't increase\n");
2468 case RS_ACTION_STAY:
2470 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2471 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2478 /* Replace uCode's rate table for the destination station. */
2480 tbl->rate.index = index;
2481 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2482 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2483 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2484 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2487 rs_stay_in_table(lq_sta, false);
2490 * Search for new modulation mode if we're:
2491 * 1) Not changing rates right now
2492 * 2) Not just finishing up a search
2493 * 3) Allowing a new search
2495 if (!update_lq && !done_search &&
2496 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2497 && window->counter) {
2498 enum rs_column next_column;
2500 /* Save current throughput to compare with "search" throughput*/
2501 lq_sta->last_tpt = current_tpt;
2504 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2505 update_lq, done_search, lq_sta->rs_state,
2508 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2509 if (next_column != RS_COLUMN_INVALID) {
2510 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2513 lq_sta->search_better_tbl = 1;
2516 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2517 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2520 /* If new "search" mode was selected, set up in uCode table */
2521 if (lq_sta->search_better_tbl) {
2522 /* Access the "search" table, clear its history. */
2523 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2524 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2526 /* Use new "search" start rate */
2527 index = tbl->rate.index;
2529 rs_dump_rate(mvm, &tbl->rate,
2530 "Switch to SEARCH TABLE:");
2531 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2538 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2540 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2541 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2542 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2546 struct rs_init_rate_info {
2551 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2552 { -60, IWL_RATE_54M_INDEX },
2553 { -64, IWL_RATE_48M_INDEX },
2554 { -68, IWL_RATE_36M_INDEX },
2555 { -80, IWL_RATE_24M_INDEX },
2556 { -84, IWL_RATE_18M_INDEX },
2557 { -85, IWL_RATE_12M_INDEX },
2558 { -86, IWL_RATE_11M_INDEX },
2559 { -88, IWL_RATE_5M_INDEX },
2560 { -90, IWL_RATE_2M_INDEX },
2561 { S8_MIN, IWL_RATE_1M_INDEX },
2564 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2565 { -60, IWL_RATE_54M_INDEX },
2566 { -64, IWL_RATE_48M_INDEX },
2567 { -72, IWL_RATE_36M_INDEX },
2568 { -80, IWL_RATE_24M_INDEX },
2569 { -84, IWL_RATE_18M_INDEX },
2570 { -85, IWL_RATE_12M_INDEX },
2571 { -87, IWL_RATE_9M_INDEX },
2572 { S8_MIN, IWL_RATE_6M_INDEX },
2575 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2576 { -60, IWL_RATE_MCS_7_INDEX },
2577 { -64, IWL_RATE_MCS_6_INDEX },
2578 { -68, IWL_RATE_MCS_5_INDEX },
2579 { -72, IWL_RATE_MCS_4_INDEX },
2580 { -80, IWL_RATE_MCS_3_INDEX },
2581 { -84, IWL_RATE_MCS_2_INDEX },
2582 { -85, IWL_RATE_MCS_1_INDEX },
2583 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2586 /* MCS index 9 is not valid for 20MHz VHT channel width,
2587 * but is ok for 40, 80 and 160MHz channels.
2589 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2590 { -60, IWL_RATE_MCS_8_INDEX },
2591 { -64, IWL_RATE_MCS_7_INDEX },
2592 { -68, IWL_RATE_MCS_6_INDEX },
2593 { -72, IWL_RATE_MCS_5_INDEX },
2594 { -80, IWL_RATE_MCS_4_INDEX },
2595 { -84, IWL_RATE_MCS_3_INDEX },
2596 { -85, IWL_RATE_MCS_2_INDEX },
2597 { -87, IWL_RATE_MCS_1_INDEX },
2598 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2601 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2602 { -60, IWL_RATE_MCS_9_INDEX },
2603 { -64, IWL_RATE_MCS_8_INDEX },
2604 { -68, IWL_RATE_MCS_7_INDEX },
2605 { -72, IWL_RATE_MCS_6_INDEX },
2606 { -80, IWL_RATE_MCS_5_INDEX },
2607 { -84, IWL_RATE_MCS_4_INDEX },
2608 { -85, IWL_RATE_MCS_3_INDEX },
2609 { -87, IWL_RATE_MCS_2_INDEX },
2610 { -88, IWL_RATE_MCS_1_INDEX },
2611 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2614 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2616 /* Init the optimal rate based on STA caps
2617 * This combined with rssi is used to report the last tx rate
2618 * to userspace when we haven't transmitted enough frames.
2620 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2621 struct ieee80211_sta *sta,
2622 struct iwl_lq_sta *lq_sta)
2624 struct rs_rate *rate = &lq_sta->optimal_rate;
2626 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2627 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2628 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2629 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2630 else if (lq_sta->band == NL80211_BAND_5GHZ)
2631 rate->type = LQ_LEGACY_A;
2633 rate->type = LQ_LEGACY_G;
2635 rate->bw = rs_bw_from_sta_bw(sta);
2636 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2638 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2640 if (is_mimo(rate)) {
2641 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2642 } else if (is_siso(rate)) {
2643 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2645 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2647 if (lq_sta->band == NL80211_BAND_5GHZ) {
2648 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2649 lq_sta->optimal_nentries =
2650 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2652 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2653 lq_sta->optimal_nentries =
2654 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2659 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2660 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2661 lq_sta->optimal_nentries =
2662 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2664 lq_sta->optimal_rates = rs_optimal_rates_vht;
2665 lq_sta->optimal_nentries =
2666 ARRAY_SIZE(rs_optimal_rates_vht);
2668 } else if (is_ht(rate)) {
2669 lq_sta->optimal_rates = rs_optimal_rates_ht;
2670 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2674 /* Compute the optimal rate index based on RSSI */
2675 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2676 struct iwl_lq_sta *lq_sta)
2678 struct rs_rate *rate = &lq_sta->optimal_rate;
2681 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2684 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2685 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2687 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2688 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2689 rate->index = rate_idx;
2697 /* Choose an initial legacy rate and antenna to use based on the RSSI
2700 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2701 struct ieee80211_sta *sta,
2702 struct iwl_lq_sta *lq_sta,
2703 enum nl80211_band band,
2704 struct rs_rate *rate,
2708 unsigned long active_rate;
2709 s8 best_rssi = S8_MIN;
2710 u8 best_ant = ANT_NONE;
2711 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2712 const struct rs_init_rate_info *initial_rates;
2714 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2715 if (!(lq_sta->pers.chains & BIT(i)))
2718 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2719 best_rssi = lq_sta->pers.chain_signal[i];
2724 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2725 rs_pretty_ant(best_ant), best_rssi);
2727 if (best_ant != ANT_A && best_ant != ANT_B)
2728 rate->ant = first_antenna(valid_tx_ant);
2730 rate->ant = best_ant;
2734 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2736 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2739 if (band == NL80211_BAND_5GHZ) {
2740 rate->type = LQ_LEGACY_A;
2741 initial_rates = rs_optimal_rates_5ghz_legacy;
2742 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2744 rate->type = LQ_LEGACY_G;
2745 initial_rates = rs_optimal_rates_24ghz_legacy;
2746 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2749 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2752 /* Start from a higher rate if the corresponding debug capability
2753 * is enabled. The rate is chosen according to AP capabilities.
2754 * In case of VHT/HT when the rssi is low fallback to the case of
2757 if (sta->vht_cap.vht_supported &&
2758 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2760 * In AP mode, when a new station associates, rs is initialized
2761 * immediately upon association completion, before the phy
2762 * context is updated with the association parameters, so the
2763 * sta bandwidth might be wider than the phy context allows.
2764 * To avoid this issue, always initialize rs with 20mhz
2765 * bandwidth rate, and after authorization, when the phy context
2766 * is already up-to-date, re-init rs with the correct bw.
2768 u32 bw = init ? RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2771 case RATE_MCS_CHAN_WIDTH_40:
2772 case RATE_MCS_CHAN_WIDTH_80:
2773 case RATE_MCS_CHAN_WIDTH_160:
2774 initial_rates = rs_optimal_rates_vht;
2775 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2777 case RATE_MCS_CHAN_WIDTH_20:
2778 initial_rates = rs_optimal_rates_vht_20mhz;
2779 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2782 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2786 active_rate = lq_sta->active_siso_rate;
2787 rate->type = LQ_VHT_SISO;
2789 } else if (sta->ht_cap.ht_supported &&
2790 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2791 initial_rates = rs_optimal_rates_ht;
2792 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2793 active_rate = lq_sta->active_siso_rate;
2794 rate->type = LQ_HT_SISO;
2796 active_rate = lq_sta->active_legacy_rate;
2799 for (i = 0; i < nentries; i++) {
2800 int rate_idx = initial_rates[i].rate_idx;
2802 if ((best_rssi >= initial_rates[i].rssi) &&
2803 (BIT(rate_idx) & active_rate)) {
2804 rate->index = rate_idx;
2810 rs_dump_rate(mvm, rate, "INITIAL");
2813 /* Save info about RSSI of last Rx */
2814 void rs_update_last_rssi(struct iwl_mvm *mvm,
2815 struct iwl_lq_sta *lq_sta,
2816 struct ieee80211_rx_status *rx_status)
2820 lq_sta->pers.chains = rx_status->chains;
2821 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2822 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2823 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2824 lq_sta->pers.last_rssi = S8_MIN;
2826 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2827 if (!(lq_sta->pers.chains & BIT(i)))
2830 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2831 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2836 * rs_initialize_lq - Initialize a station's hardware rate table
2838 * The uCode's station table contains a table of fallback rates
2839 * for automatic fallback during transmission.
2841 * NOTE: This sets up a default set of values. These will be replaced later
2842 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2845 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2846 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2847 * which requires station table entry to exist).
2849 static void rs_initialize_lq(struct iwl_mvm *mvm,
2850 struct ieee80211_sta *sta,
2851 struct iwl_lq_sta *lq_sta,
2852 enum nl80211_band band,
2855 struct iwl_scale_tbl_info *tbl;
2856 struct rs_rate *rate;
2859 if (!sta || !lq_sta)
2862 if (!lq_sta->search_better_tbl)
2863 active_tbl = lq_sta->active_tbl;
2865 active_tbl = 1 - lq_sta->active_tbl;
2867 tbl = &(lq_sta->lq_info[active_tbl]);
2870 rs_get_initial_rate(mvm, sta, lq_sta, band, rate, init);
2871 rs_init_optimal_rate(mvm, sta, lq_sta);
2873 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2874 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2875 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2876 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2878 tbl->column = rs_get_column_from_rate(rate);
2880 rs_set_expected_tpt_table(lq_sta, tbl);
2881 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2882 /* TODO restore station should remember the lq cmd */
2883 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2886 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2887 struct ieee80211_tx_rate_control *txrc)
2889 struct sk_buff *skb = txrc->skb;
2890 struct iwl_op_mode *op_mode __maybe_unused =
2891 (struct iwl_op_mode *)mvm_r;
2892 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2893 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2894 struct iwl_lq_sta *lq_sta = mvm_sta;
2895 struct rs_rate *optimal_rate;
2896 u32 last_ucode_rate;
2898 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2899 /* if vif isn't initialized mvm doesn't know about
2900 * this station, so don't do anything with the it
2906 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2908 /* Treat uninitialized rate scaling data same as non-existing. */
2909 if (lq_sta && !lq_sta->pers.drv) {
2910 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2914 /* Send management frames and NO_ACK data using lowest rate. */
2915 if (rate_control_send_low(sta, mvm_sta, txrc))
2918 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2919 info->band, &info->control.rates[0]);
2920 info->control.rates[0].count = 1;
2922 /* Report the optimal rate based on rssi and STA caps if we haven't
2923 * converged yet (too little traffic) or exploring other modulations
2925 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2926 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2927 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2929 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2930 &txrc->reported_rate);
2934 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2937 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2938 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2939 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2940 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
2942 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2944 lq_sta->pers.drv = mvm;
2945 #ifdef CONFIG_MAC80211_DEBUGFS
2946 lq_sta->pers.dbg_fixed_rate = 0;
2947 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2948 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2950 lq_sta->pers.chains = 0;
2951 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2952 lq_sta->pers.last_rssi = S8_MIN;
2954 return &mvmsta->lq_sta;
2957 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2960 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2961 (0x3 << (2 * (nss - 1)));
2962 rx_mcs >>= (2 * (nss - 1));
2964 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2965 return IWL_RATE_MCS_7_INDEX;
2966 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2967 return IWL_RATE_MCS_8_INDEX;
2968 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2969 return IWL_RATE_MCS_9_INDEX;
2971 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2975 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2976 struct ieee80211_sta_vht_cap *vht_cap,
2977 struct iwl_lq_sta *lq_sta)
2980 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2982 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2983 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2984 if (i == IWL_RATE_9M_INDEX)
2987 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2988 if (i == IWL_RATE_MCS_9_INDEX &&
2989 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2992 lq_sta->active_siso_rate |= BIT(i);
2996 if (sta->rx_nss < 2)
2999 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
3000 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3001 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3002 if (i == IWL_RATE_9M_INDEX)
3005 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3006 if (i == IWL_RATE_MCS_9_INDEX &&
3007 sta->bandwidth == IEEE80211_STA_RX_BW_20)
3010 lq_sta->active_mimo2_rate |= BIT(i);
3015 static void rs_ht_init(struct iwl_mvm *mvm,
3016 struct ieee80211_sta *sta,
3017 struct iwl_lq_sta *lq_sta,
3018 struct ieee80211_sta_ht_cap *ht_cap)
3020 /* active_siso_rate mask includes 9 MBits (bit 5),
3021 * and CCK (bits 0-3), supp_rates[] does not;
3022 * shift to convert format, force 9 MBits off.
3024 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3025 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3026 lq_sta->active_siso_rate &= ~((u16)0x2);
3027 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3029 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3030 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3031 lq_sta->active_mimo2_rate &= ~((u16)0x2);
3032 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3034 if (mvm->cfg->ht_params->ldpc &&
3035 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3036 lq_sta->ldpc = true;
3038 if (mvm->cfg->ht_params->stbc &&
3039 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3040 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3041 lq_sta->stbc_capable = true;
3043 lq_sta->is_vht = false;
3046 static void rs_vht_init(struct iwl_mvm *mvm,
3047 struct ieee80211_sta *sta,
3048 struct iwl_lq_sta *lq_sta,
3049 struct ieee80211_sta_vht_cap *vht_cap)
3051 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3053 if (mvm->cfg->ht_params->ldpc &&
3054 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3055 lq_sta->ldpc = true;
3057 if (mvm->cfg->ht_params->stbc &&
3058 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3059 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3060 lq_sta->stbc_capable = true;
3062 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3063 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3064 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3065 lq_sta->bfer_capable = true;
3067 lq_sta->is_vht = true;
3070 #ifdef CONFIG_IWLWIFI_DEBUGFS
3071 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3073 spin_lock_bh(&mvm->drv_stats_lock);
3074 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3075 spin_unlock_bh(&mvm->drv_stats_lock);
3078 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3082 spin_lock(&mvm->drv_stats_lock);
3085 mvm->drv_rx_stats.agg_frames++;
3087 mvm->drv_rx_stats.success_frames++;
3089 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3090 case RATE_MCS_CHAN_WIDTH_20:
3091 mvm->drv_rx_stats.bw_20_frames++;
3093 case RATE_MCS_CHAN_WIDTH_40:
3094 mvm->drv_rx_stats.bw_40_frames++;
3096 case RATE_MCS_CHAN_WIDTH_80:
3097 mvm->drv_rx_stats.bw_80_frames++;
3099 case RATE_MCS_CHAN_WIDTH_160:
3100 mvm->drv_rx_stats.bw_160_frames++;
3103 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3106 if (rate & RATE_MCS_HT_MSK) {
3107 mvm->drv_rx_stats.ht_frames++;
3108 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3109 } else if (rate & RATE_MCS_VHT_MSK) {
3110 mvm->drv_rx_stats.vht_frames++;
3111 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3112 RATE_VHT_MCS_NSS_POS) + 1;
3114 mvm->drv_rx_stats.legacy_frames++;
3118 mvm->drv_rx_stats.siso_frames++;
3120 mvm->drv_rx_stats.mimo2_frames++;
3122 if (rate & RATE_MCS_SGI_MSK)
3123 mvm->drv_rx_stats.sgi_frames++;
3125 mvm->drv_rx_stats.ngi_frames++;
3127 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3128 mvm->drv_rx_stats.last_frame_idx =
3129 (mvm->drv_rx_stats.last_frame_idx + 1) %
3130 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3132 spin_unlock(&mvm->drv_stats_lock);
3137 * Called after adding a new station to initialize rate scaling
3139 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3140 enum nl80211_band band, bool init)
3143 struct ieee80211_hw *hw = mvm->hw;
3144 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3145 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3146 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3147 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
3148 struct ieee80211_supported_band *sband;
3149 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3151 /* clear all non-persistent lq data */
3152 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3154 sband = hw->wiphy->bands[band];
3156 lq_sta->lq.sta_id = mvmsta->sta_id;
3157 mvmsta->tlc_amsdu = false;
3159 for (j = 0; j < LQ_SIZE; j++)
3160 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3162 lq_sta->flush_timer = 0;
3163 lq_sta->last_tx = jiffies;
3166 "LQ: *** rate scale station global init for station %d ***\n",
3168 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3169 * the lowest or the highest rate.. Could consider using RSSI from
3170 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3173 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3174 lq_sta->band = sband->band;
3176 * active legacy rates as per supported rates bitmap
3178 supp = sta->supp_rates[sband->band];
3179 lq_sta->active_legacy_rate = 0;
3180 for_each_set_bit(i, &supp, BITS_PER_LONG)
3181 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3183 /* TODO: should probably account for rx_highest for both HT/VHT */
3184 if (!vht_cap || !vht_cap->vht_supported)
3185 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3187 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3189 lq_sta->max_legacy_rate_idx =
3190 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3191 lq_sta->max_siso_rate_idx =
3192 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3193 lq_sta->max_mimo2_rate_idx =
3194 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3197 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3198 lq_sta->active_legacy_rate,
3199 lq_sta->active_siso_rate,
3200 lq_sta->active_mimo2_rate,
3201 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3202 lq_sta->bfer_capable);
3203 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3204 lq_sta->max_legacy_rate_idx,
3205 lq_sta->max_siso_rate_idx,
3206 lq_sta->max_mimo2_rate_idx);
3208 /* These values will be overridden later */
3209 lq_sta->lq.single_stream_ant_msk =
3210 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3211 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3213 /* as default allow aggregation for all tids */
3214 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3216 #ifdef CONFIG_IWLWIFI_DEBUGFS
3217 iwl_mvm_reset_frame_stats(mvm);
3219 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3222 static void rs_rate_update(void *mvm_r,
3223 struct ieee80211_supported_band *sband,
3224 struct cfg80211_chan_def *chandef,
3225 struct ieee80211_sta *sta, void *priv_sta,
3229 struct iwl_op_mode *op_mode =
3230 (struct iwl_op_mode *)mvm_r;
3231 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3233 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3236 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3237 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3238 ieee80211_stop_tx_ba_session(sta, tid);
3240 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3243 #ifdef CONFIG_MAC80211_DEBUGFS
3244 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3245 struct iwl_lq_cmd *lq_cmd,
3246 enum nl80211_band band,
3249 struct rs_rate rate;
3251 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3252 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3253 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3255 for (i = 0; i < num_rates; i++)
3256 lq_cmd->rs_table[i] = ucode_rate_le32;
3258 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3264 lq_cmd->mimo_delim = num_rates - 1;
3266 lq_cmd->mimo_delim = 0;
3268 lq_cmd->reduced_tpc = 0;
3270 if (num_of_ant(ant) == 1)
3271 lq_cmd->single_stream_ant_msk = ant;
3273 if (!mvm->trans->cfg->gen2)
3274 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3276 lq_cmd->agg_frame_cnt_limit =
3277 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3279 #endif /* CONFIG_MAC80211_DEBUGFS */
3281 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3282 struct iwl_lq_sta *lq_sta,
3283 struct rs_rate *rate,
3284 __le32 *rs_table, int *rs_table_index,
3285 int num_rates, int num_retries,
3286 u8 valid_tx_ant, bool toggle_ant)
3290 bool bottom_reached = false;
3291 int prev_rate_idx = rate->index;
3292 int end = LINK_QUAL_MAX_RETRY_NUM;
3293 int index = *rs_table_index;
3295 for (i = 0; i < num_rates && index < end; i++) {
3296 for (j = 0; j < num_retries && index < end; j++, index++) {
3297 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3299 rs_table[index] = ucode_rate;
3301 rs_toggle_antenna(valid_tx_ant, rate);
3304 prev_rate_idx = rate->index;
3305 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3306 if (bottom_reached && !is_legacy(rate))
3310 if (!bottom_reached && !is_legacy(rate))
3311 rate->index = prev_rate_idx;
3313 *rs_table_index = index;
3316 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3317 * column the rate table should look like this:
3319 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3320 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3321 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3322 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3323 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3324 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3325 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3326 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3327 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3328 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3329 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3330 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3331 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3332 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3333 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3334 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3336 static void rs_build_rates_table(struct iwl_mvm *mvm,
3337 struct ieee80211_sta *sta,
3338 struct iwl_lq_sta *lq_sta,
3339 const struct rs_rate *initial_rate)
3341 struct rs_rate rate;
3342 int num_rates, num_retries, index = 0;
3343 u8 valid_tx_ant = 0;
3344 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3345 bool toggle_ant = false;
3348 memcpy(&rate, initial_rate, sizeof(rate));
3350 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3352 /* TODO: remove old API when min FW API hits 14 */
3353 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3354 rs_stbc_allow(mvm, sta, lq_sta))
3357 if (is_siso(&rate)) {
3358 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3359 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3360 } else if (is_mimo(&rate)) {
3361 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3362 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3364 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3365 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3369 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3370 num_rates, num_retries, valid_tx_ant,
3373 rs_get_lower_rate_down_column(lq_sta, &rate);
3375 if (is_siso(&rate)) {
3376 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3377 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3378 lq_cmd->mimo_delim = index;
3379 } else if (is_legacy(&rate)) {
3380 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3381 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3388 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3389 num_rates, num_retries, valid_tx_ant,
3392 rs_get_lower_rate_down_column(lq_sta, &rate);
3394 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3395 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3397 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3398 num_rates, num_retries, valid_tx_ant,
3401 /* update the color of the LQ command (as a counter at bits 1-3) */
3402 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3403 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3406 struct rs_bfer_active_iter_data {
3407 struct ieee80211_sta *exclude_sta;
3408 struct iwl_mvm_sta *bfer_mvmsta;
3411 static void rs_bfer_active_iter(void *_data,
3412 struct ieee80211_sta *sta)
3414 struct rs_bfer_active_iter_data *data = _data;
3415 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3416 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3417 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3419 if (sta == data->exclude_sta)
3422 /* The current sta has BFER allowed */
3423 if (ss_params & LQ_SS_BFER_ALLOWED) {
3424 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3426 data->bfer_mvmsta = mvmsta;
3430 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3433 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3436 case NL80211_IFTYPE_AP:
3437 case NL80211_IFTYPE_P2P_GO:
3440 case NL80211_IFTYPE_P2P_CLIENT:
3443 case NL80211_IFTYPE_STATION:
3447 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3454 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3455 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3456 struct iwl_mvm_sta *sta2)
3458 int prio1 = rs_bfer_priority(sta1);
3459 int prio2 = rs_bfer_priority(sta2);
3468 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3469 struct ieee80211_sta *sta,
3470 struct iwl_lq_sta *lq_sta,
3471 const struct rs_rate *initial_rate)
3473 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3474 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3475 struct rs_bfer_active_iter_data data = {
3477 .bfer_mvmsta = NULL,
3479 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3480 u32 ss_params = LQ_SS_PARAMS_VALID;
3482 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3485 #ifdef CONFIG_MAC80211_DEBUGFS
3486 /* Check if forcing the decision is configured.
3487 * Note that SISO is forced by not allowing STBC or BFER
3489 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3490 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3491 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3492 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3494 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3495 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3496 lq_sta->pers.ss_force);
3501 if (lq_sta->stbc_capable)
3502 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3504 if (!lq_sta->bfer_capable)
3507 ieee80211_iterate_stations_atomic(mvm->hw,
3508 rs_bfer_active_iter,
3510 bfer_mvmsta = data.bfer_mvmsta;
3512 /* This code is safe as it doesn't run concurrently for different
3513 * stations. This is guaranteed by the fact that calls to
3514 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3517 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3519 ss_params |= LQ_SS_BFER_ALLOWED;
3523 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3524 bfer_mvmsta->sta_id);
3526 /* Disallow BFER on another STA if active and we're a higher priority */
3527 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3528 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3529 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3531 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3532 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3533 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3535 ss_params |= LQ_SS_BFER_ALLOWED;
3537 "Lower priority BFER sta found (%d). Switch BFER\n",
3538 bfer_mvmsta->sta_id);
3541 lq_cmd->ss_params = cpu_to_le32(ss_params);
3544 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3545 struct ieee80211_sta *sta,
3546 struct iwl_lq_sta *lq_sta,
3547 const struct rs_rate *initial_rate)
3549 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3550 struct iwl_mvm_sta *mvmsta;
3551 struct iwl_mvm_vif *mvmvif;
3553 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3554 lq_cmd->agg_time_limit =
3555 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3557 #ifdef CONFIG_MAC80211_DEBUGFS
3558 if (lq_sta->pers.dbg_fixed_rate) {
3559 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3561 lq_sta->pers.dbg_fixed_rate);
3565 if (WARN_ON_ONCE(!sta || !initial_rate))
3568 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3570 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3571 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3573 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3574 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3576 if (num_of_ant(initial_rate->ant) == 1)
3577 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3579 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3582 * In case of low latency, tell the firmware to leave a frame in the
3583 * Tx Fifo so that it can start a transaction in the same TxOP. This
3584 * basically allows the firmware to send bursts.
3586 if (iwl_mvm_vif_low_latency(mvmvif))
3587 lq_cmd->agg_frame_cnt_limit--;
3589 if (mvmsta->vif->p2p)
3590 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3592 lq_cmd->agg_time_limit =
3593 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3596 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3600 /* rate scale requires free function to be implemented */
3601 static void rs_free(void *mvm_rate)
3606 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3609 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3610 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3612 IWL_DEBUG_RATE(mvm, "enter\n");
3613 IWL_DEBUG_RATE(mvm, "leave\n");
3616 #ifdef CONFIG_MAC80211_DEBUGFS
3617 int rs_pretty_print_rate(char *buf, const u32 rate)
3621 u8 mcs = 0, nss = 0;
3622 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3624 if (!(rate & RATE_MCS_HT_MSK) &&
3625 !(rate & RATE_MCS_VHT_MSK)) {
3626 int index = iwl_hwrate_to_plcp_idx(rate);
3628 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3630 index == IWL_RATE_INVALID ? "BAD" :
3631 iwl_rate_mcs[index].mbps);
3634 if (rate & RATE_MCS_VHT_MSK) {
3636 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3637 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3638 >> RATE_VHT_MCS_NSS_POS) + 1;
3639 } else if (rate & RATE_MCS_HT_MSK) {
3641 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3642 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3643 >> RATE_HT_MCS_NSS_POS) + 1;
3645 type = "Unknown"; /* shouldn't happen */
3648 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3649 case RATE_MCS_CHAN_WIDTH_20:
3652 case RATE_MCS_CHAN_WIDTH_40:
3655 case RATE_MCS_CHAN_WIDTH_80:
3658 case RATE_MCS_CHAN_WIDTH_160:
3665 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3666 type, rs_pretty_ant(ant), bw, mcs, nss,
3667 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3668 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3669 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3670 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3674 * Program the device to use fixed rate for frame transmit
3675 * This is for debugging/testing only
3676 * once the device start use fixed rate, we need to reload the module
3677 * to being back the normal operation.
3679 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3680 struct iwl_lq_sta *lq_sta)
3682 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3683 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3684 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3686 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3687 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3689 if (lq_sta->pers.dbg_fixed_rate) {
3690 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3691 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3695 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3696 const char __user *user_buf, size_t count, loff_t *ppos)
3698 struct iwl_lq_sta *lq_sta = file->private_data;
3699 struct iwl_mvm *mvm;
3704 mvm = lq_sta->pers.drv;
3705 memset(buf, 0, sizeof(buf));
3706 buf_size = min(count, sizeof(buf) - 1);
3707 if (copy_from_user(buf, user_buf, buf_size))
3710 if (sscanf(buf, "%x", &parsed_rate) == 1)
3711 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3713 lq_sta->pers.dbg_fixed_rate = 0;
3715 rs_program_fix_rate(mvm, lq_sta);
3720 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3721 char __user *user_buf, size_t count, loff_t *ppos)
3728 struct iwl_lq_sta *lq_sta = file->private_data;
3729 struct iwl_mvm_sta *mvmsta =
3730 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3731 struct iwl_mvm *mvm;
3732 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3733 struct rs_rate *rate = &tbl->rate;
3736 mvm = lq_sta->pers.drv;
3737 buff = kmalloc(2048, GFP_KERNEL);
3741 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3742 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3743 lq_sta->total_failed, lq_sta->total_success,
3744 lq_sta->active_legacy_rate);
3745 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3746 lq_sta->pers.dbg_fixed_rate);
3747 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3748 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3749 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3750 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3751 desc += sprintf(buff+desc, "lq type %s\n",
3752 (is_legacy(rate)) ? "legacy" :
3753 is_vht(rate) ? "VHT" : "HT");
3754 if (!is_legacy(rate)) {
3755 desc += sprintf(buff + desc, " %s",
3756 (is_siso(rate)) ? "SISO" : "MIMO2");
3757 desc += sprintf(buff + desc, " %s",
3758 (is_ht20(rate)) ? "20MHz" :
3759 (is_ht40(rate)) ? "40MHz" :
3760 (is_ht80(rate)) ? "80MHz" :
3761 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3762 desc += sprintf(buff + desc, " %s %s %s %s\n",
3763 (rate->sgi) ? "SGI" : "NGI",
3764 (rate->ldpc) ? "LDPC" : "BCC",
3765 (lq_sta->is_agg) ? "AGG on" : "",
3766 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3768 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3769 lq_sta->last_rate_n_flags);
3770 desc += sprintf(buff+desc,
3771 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3773 lq_sta->lq.mimo_delim,
3774 lq_sta->lq.single_stream_ant_msk,
3775 lq_sta->lq.dual_stream_ant_msk);
3777 desc += sprintf(buff+desc,
3778 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3779 le16_to_cpu(lq_sta->lq.agg_time_limit),
3780 lq_sta->lq.agg_disable_start_th,
3781 lq_sta->lq.agg_frame_cnt_limit);
3783 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3784 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3785 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3786 (ss_params & LQ_SS_PARAMS_VALID) ?
3787 "VALID" : "INVALID",
3788 (ss_params & LQ_SS_BFER_ALLOWED) ?
3790 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3792 (ss_params & LQ_SS_FORCE) ?
3794 desc += sprintf(buff+desc,
3795 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3796 lq_sta->lq.initial_rate_index[0],
3797 lq_sta->lq.initial_rate_index[1],
3798 lq_sta->lq.initial_rate_index[2],
3799 lq_sta->lq.initial_rate_index[3]);
3801 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3802 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3804 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3805 desc += rs_pretty_print_rate(buff+desc, r);
3808 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3813 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3814 .write = rs_sta_dbgfs_scale_table_write,
3815 .read = rs_sta_dbgfs_scale_table_read,
3816 .open = simple_open,
3817 .llseek = default_llseek,
3819 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3820 char __user *user_buf, size_t count, loff_t *ppos)
3826 struct iwl_scale_tbl_info *tbl;
3827 struct rs_rate *rate;
3828 struct iwl_lq_sta *lq_sta = file->private_data;
3830 buff = kmalloc(1024, GFP_KERNEL);
3834 for (i = 0; i < LQ_SIZE; i++) {
3835 tbl = &(lq_sta->lq_info[i]);
3837 desc += sprintf(buff+desc,
3838 "%s type=%d SGI=%d BW=%s DUP=0\n"
3840 lq_sta->active_tbl == i ? "*" : "x",
3843 is_ht20(rate) ? "20MHz" :
3844 is_ht40(rate) ? "40MHz" :
3845 is_ht80(rate) ? "80MHz" :
3846 is_ht160(rate) ? "160MHz" : "ERR",
3848 for (j = 0; j < IWL_RATE_COUNT; j++) {
3849 desc += sprintf(buff+desc,
3850 "counter=%d success=%d %%=%d\n",
3851 tbl->win[j].counter,
3852 tbl->win[j].success_counter,
3853 tbl->win[j].success_ratio);
3856 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3861 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3862 .read = rs_sta_dbgfs_stats_table_read,
3863 .open = simple_open,
3864 .llseek = default_llseek,
3867 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3868 char __user *user_buf,
3869 size_t count, loff_t *ppos)
3871 static const char * const column_name[] = {
3872 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3873 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3874 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3875 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3876 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3877 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3878 [RS_COLUMN_MIMO2] = "MIMO2",
3879 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3882 static const char * const rate_name[] = {
3883 [IWL_RATE_1M_INDEX] = "1M",
3884 [IWL_RATE_2M_INDEX] = "2M",
3885 [IWL_RATE_5M_INDEX] = "5.5M",
3886 [IWL_RATE_11M_INDEX] = "11M",
3887 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3888 [IWL_RATE_9M_INDEX] = "9M",
3889 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3890 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3891 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3892 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3893 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3894 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3895 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3896 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3897 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3900 char *buff, *pos, *endpos;
3903 struct iwl_lq_sta *lq_sta = file->private_data;
3904 struct rs_rate_stats *stats;
3905 static const size_t bufsz = 1024;
3907 buff = kmalloc(bufsz, GFP_KERNEL);
3912 endpos = pos + bufsz;
3914 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3915 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3916 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3917 pos += scnprintf(pos, endpos - pos, "\n");
3919 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3920 pos += scnprintf(pos, endpos - pos,
3921 "%s,", column_name[col]);
3923 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3924 stats = &(lq_sta->pers.tx_stats[col][rate]);
3925 pos += scnprintf(pos, endpos - pos,
3930 pos += scnprintf(pos, endpos - pos, "\n");
3933 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3938 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3939 const char __user *user_buf,
3940 size_t count, loff_t *ppos)
3942 struct iwl_lq_sta *lq_sta = file->private_data;
3943 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3948 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3949 .read = rs_sta_dbgfs_drv_tx_stats_read,
3950 .write = rs_sta_dbgfs_drv_tx_stats_write,
3951 .open = simple_open,
3952 .llseek = default_llseek,
3955 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3956 char __user *user_buf,
3957 size_t count, loff_t *ppos)
3959 struct iwl_lq_sta *lq_sta = file->private_data;
3961 int bufsz = sizeof(buf);
3963 static const char * const ss_force_name[] = {
3964 [RS_SS_FORCE_NONE] = "none",
3965 [RS_SS_FORCE_STBC] = "stbc",
3966 [RS_SS_FORCE_BFER] = "bfer",
3967 [RS_SS_FORCE_SISO] = "siso",
3970 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3971 ss_force_name[lq_sta->pers.ss_force]);
3972 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3975 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3976 size_t count, loff_t *ppos)
3978 struct iwl_mvm *mvm = lq_sta->pers.drv;
3981 if (!strncmp("none", buf, 4)) {
3982 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3983 } else if (!strncmp("siso", buf, 4)) {
3984 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3985 } else if (!strncmp("stbc", buf, 4)) {
3986 if (lq_sta->stbc_capable) {
3987 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3990 "can't force STBC. peer doesn't support\n");
3993 } else if (!strncmp("bfer", buf, 4)) {
3994 if (lq_sta->bfer_capable) {
3995 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3998 "can't force BFER. peer doesn't support\n");
4002 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4005 return ret ?: count;
4008 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4009 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4010 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
4011 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
4012 &iwl_dbgfs_##name##_ops)) \
4016 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4018 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
4020 struct iwl_lq_sta *lq_sta = priv_sta;
4021 struct iwl_mvm_sta *mvmsta;
4023 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
4028 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
4029 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4030 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
4031 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4032 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
4033 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4034 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
4035 &lq_sta->tx_agg_tid_en);
4036 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4037 &lq_sta->pers.dbg_fixed_txp_reduction);
4039 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4042 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4045 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4051 * Initialization of rate scaling information is done by driver after
4052 * the station is added. Since mac80211 calls this function before a
4053 * station is added we ignore it.
4055 static void rs_rate_init_stub(void *mvm_r,
4056 struct ieee80211_supported_band *sband,
4057 struct cfg80211_chan_def *chandef,
4058 struct ieee80211_sta *sta, void *mvm_sta)
4062 static const struct rate_control_ops rs_mvm_ops = {
4064 .tx_status = rs_mac80211_tx_status,
4065 .get_rate = rs_get_rate,
4066 .rate_init = rs_rate_init_stub,
4069 .alloc_sta = rs_alloc_sta,
4070 .free_sta = rs_free_sta,
4071 .rate_update = rs_rate_update,
4072 #ifdef CONFIG_MAC80211_DEBUGFS
4073 .add_sta_debugfs = rs_add_debugfs,
4074 .remove_sta_debugfs = rs_remove_debugfs,
4078 int iwl_mvm_rate_control_register(void)
4080 return ieee80211_rate_control_register(&rs_mvm_ops);
4083 void iwl_mvm_rate_control_unregister(void)
4085 ieee80211_rate_control_unregister(&rs_mvm_ops);
4089 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4090 * Tx protection, according to this request and previous requests,
4091 * and send the LQ command.
4092 * @mvmsta: The station
4093 * @enable: Enable Tx protection?
4095 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4098 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4100 lockdep_assert_held(&mvm->mutex);
4103 if (mvmsta->tx_protection == 0)
4104 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4105 mvmsta->tx_protection++;
4107 mvmsta->tx_protection--;
4108 if (mvmsta->tx_protection == 0)
4109 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4112 return iwl_mvm_send_lq_cmd(mvm, lq, false);