1 /******************************************************************************
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
5 * Copyright(c) 2016 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 struct iwl_mvm_sta *mvmsta;
165 struct iwl_mvm_vif *mvmvif;
167 if (!sta->ht_cap.ht_supported)
170 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
173 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
176 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
179 mvmsta = iwl_mvm_sta_from_mac80211(sta);
180 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
182 if (mvm->nvm_data->sku_cap_mimo_disabled)
188 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
189 struct rs_rate *rate,
190 const struct rs_tx_column *next_col)
192 if (!sta->ht_cap.ht_supported)
198 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
199 struct rs_rate *rate,
200 const struct rs_tx_column *next_col)
202 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
203 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
205 if (is_ht20(rate) && (ht_cap->cap &
206 IEEE80211_HT_CAP_SGI_20))
208 if (is_ht40(rate) && (ht_cap->cap &
209 IEEE80211_HT_CAP_SGI_40))
211 if (is_ht80(rate) && (vht_cap->cap &
212 IEEE80211_VHT_CAP_SHORT_GI_80))
214 if (is_ht160(rate) && (vht_cap->cap &
215 IEEE80211_VHT_CAP_SHORT_GI_160))
221 static const struct rs_tx_column rs_tx_columns[] = {
222 [RS_COLUMN_LEGACY_ANT_A] = {
226 RS_COLUMN_LEGACY_ANT_B,
227 RS_COLUMN_SISO_ANT_A,
238 [RS_COLUMN_LEGACY_ANT_B] = {
242 RS_COLUMN_LEGACY_ANT_A,
243 RS_COLUMN_SISO_ANT_B,
254 [RS_COLUMN_SISO_ANT_A] = {
258 RS_COLUMN_SISO_ANT_B,
260 RS_COLUMN_SISO_ANT_A_SGI,
261 RS_COLUMN_LEGACY_ANT_A,
262 RS_COLUMN_LEGACY_ANT_B,
271 [RS_COLUMN_SISO_ANT_B] = {
275 RS_COLUMN_SISO_ANT_A,
277 RS_COLUMN_SISO_ANT_B_SGI,
278 RS_COLUMN_LEGACY_ANT_A,
279 RS_COLUMN_LEGACY_ANT_B,
288 [RS_COLUMN_SISO_ANT_A_SGI] = {
293 RS_COLUMN_SISO_ANT_B_SGI,
295 RS_COLUMN_SISO_ANT_A,
296 RS_COLUMN_LEGACY_ANT_A,
297 RS_COLUMN_LEGACY_ANT_B,
307 [RS_COLUMN_SISO_ANT_B_SGI] = {
312 RS_COLUMN_SISO_ANT_A_SGI,
314 RS_COLUMN_SISO_ANT_B,
315 RS_COLUMN_LEGACY_ANT_A,
316 RS_COLUMN_LEGACY_ANT_B,
326 [RS_COLUMN_MIMO2] = {
330 RS_COLUMN_SISO_ANT_A,
332 RS_COLUMN_LEGACY_ANT_A,
333 RS_COLUMN_LEGACY_ANT_B,
342 [RS_COLUMN_MIMO2_SGI] = {
347 RS_COLUMN_SISO_ANT_A_SGI,
349 RS_COLUMN_LEGACY_ANT_A,
350 RS_COLUMN_LEGACY_ANT_B,
362 static inline u8 rs_extract_rate(u32 rate_n_flags)
364 /* also works for HT because bits 7:6 are zero there */
365 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
368 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
372 if (rate_n_flags & RATE_MCS_HT_MSK) {
373 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
374 idx += IWL_RATE_MCS_0_INDEX;
376 /* skip 9M not supported in HT*/
377 if (idx >= IWL_RATE_9M_INDEX)
379 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
381 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
382 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
383 idx += IWL_RATE_MCS_0_INDEX;
385 /* skip 9M not supported in VHT*/
386 if (idx >= IWL_RATE_9M_INDEX)
388 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
391 /* legacy rate format, search for match in table */
393 u8 legacy_rate = rs_extract_rate(rate_n_flags);
394 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
395 if (iwl_rates[idx].plcp == legacy_rate)
399 return IWL_RATE_INVALID;
402 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
403 struct ieee80211_sta *sta,
404 struct iwl_lq_sta *lq_sta,
406 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
407 struct ieee80211_sta *sta,
408 struct iwl_lq_sta *lq_sta,
409 const struct rs_rate *initial_rate);
410 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
413 * The following tables contain the expected throughput metrics for all rates
415 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
417 * where invalid entries are zeros.
419 * CCK rates are only valid in legacy table and will only be used in G
423 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
424 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
427 /* Expected TpT tables. 4 indexes:
428 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
430 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
431 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
432 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
433 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
434 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
437 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
438 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
439 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
440 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
441 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
444 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
445 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
446 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
447 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
448 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
451 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
452 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
453 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
454 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
455 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
458 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
459 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
460 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
461 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
462 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
465 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
466 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
467 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
468 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
469 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
472 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
473 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
474 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
475 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
476 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
479 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
480 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
481 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
482 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
483 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
487 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
496 { "24", "16QAM 1/2"},
497 { "36", "16QAM 3/4"},
498 { "48", "64QAM 2/3"},
499 { "54", "64QAM 3/4"},
500 { "60", "64QAM 5/6"},
503 #define MCS_INDEX_PER_STREAM (8)
505 static const char *rs_pretty_ant(u8 ant)
507 static const char * const ant_name[] = {
521 return ant_name[ant];
524 static const char *rs_pretty_lq_type(enum iwl_table_type type)
526 static const char * const lq_types[] = {
528 [LQ_LEGACY_A] = "LEGACY_A",
529 [LQ_LEGACY_G] = "LEGACY_G",
530 [LQ_HT_SISO] = "HT SISO",
531 [LQ_HT_MIMO2] = "HT MIMO",
532 [LQ_VHT_SISO] = "VHT SISO",
533 [LQ_VHT_MIMO2] = "VHT MIMO",
536 if (type < LQ_NONE || type >= LQ_MAX)
539 return lq_types[type];
542 static char *rs_pretty_rate(const struct rs_rate *rate)
545 static const char * const legacy_rates[] = {
546 [IWL_RATE_1M_INDEX] = "1M",
547 [IWL_RATE_2M_INDEX] = "2M",
548 [IWL_RATE_5M_INDEX] = "5.5M",
549 [IWL_RATE_11M_INDEX] = "11M",
550 [IWL_RATE_6M_INDEX] = "6M",
551 [IWL_RATE_9M_INDEX] = "9M",
552 [IWL_RATE_12M_INDEX] = "12M",
553 [IWL_RATE_18M_INDEX] = "18M",
554 [IWL_RATE_24M_INDEX] = "24M",
555 [IWL_RATE_36M_INDEX] = "36M",
556 [IWL_RATE_48M_INDEX] = "48M",
557 [IWL_RATE_54M_INDEX] = "54M",
559 static const char *const ht_vht_rates[] = {
560 [IWL_RATE_MCS_0_INDEX] = "MCS0",
561 [IWL_RATE_MCS_1_INDEX] = "MCS1",
562 [IWL_RATE_MCS_2_INDEX] = "MCS2",
563 [IWL_RATE_MCS_3_INDEX] = "MCS3",
564 [IWL_RATE_MCS_4_INDEX] = "MCS4",
565 [IWL_RATE_MCS_5_INDEX] = "MCS5",
566 [IWL_RATE_MCS_6_INDEX] = "MCS6",
567 [IWL_RATE_MCS_7_INDEX] = "MCS7",
568 [IWL_RATE_MCS_8_INDEX] = "MCS8",
569 [IWL_RATE_MCS_9_INDEX] = "MCS9",
571 const char *rate_str;
573 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
574 rate_str = legacy_rates[rate->index];
575 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
576 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
577 (rate->index <= IWL_RATE_MCS_9_INDEX))
578 rate_str = ht_vht_rates[rate->index];
580 rate_str = "BAD_RATE";
582 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
583 rs_pretty_ant(rate->ant), rate_str);
587 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
591 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
592 prefix, rs_pretty_rate(rate), rate->bw,
593 rate->sgi, rate->ldpc, rate->stbc);
596 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
599 window->success_counter = 0;
600 window->success_ratio = IWL_INVALID_VALUE;
602 window->average_tpt = IWL_INVALID_VALUE;
605 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
606 struct iwl_scale_tbl_info *tbl)
610 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
611 for (i = 0; i < IWL_RATE_COUNT; i++)
612 rs_rate_scale_clear_window(&tbl->win[i]);
614 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
615 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
618 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
620 return (ant_type & valid_antenna) == ant_type;
623 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
624 struct iwl_lq_sta *lq_data, u8 tid,
625 struct ieee80211_sta *sta)
629 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
631 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
632 if (ret == -EAGAIN) {
634 * driver and mac80211 is out of sync
635 * this might be cause by reloading firmware
636 * stop the tx ba session here
638 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
640 ieee80211_stop_tx_ba_session(sta, tid);
645 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
646 struct iwl_lq_sta *lq_data,
647 struct ieee80211_sta *sta)
649 if (tid < IWL_MAX_TID_COUNT)
650 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
652 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
653 tid, IWL_MAX_TID_COUNT);
656 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
658 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
659 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
660 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
664 * Static function to get the expected throughput from an iwl_scale_tbl_info
665 * that wraps a NULL pointer check
667 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
669 if (tbl->expected_tpt)
670 return tbl->expected_tpt[rs_index];
675 * rs_collect_tx_data - Update the success/failure sliding window
677 * We keep a sliding window of the last 62 packets transmitted
678 * at this rate. window->data contains the bitmask of successful
681 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
682 struct iwl_scale_tbl_info *tbl,
683 int scale_index, int attempts, int successes,
684 struct iwl_rate_scale_data *window)
686 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
689 /* Get expected throughput */
690 tpt = get_expected_tpt(tbl, scale_index);
693 * Keep track of only the latest 62 tx frame attempts in this rate's
694 * history window; anything older isn't really relevant any more.
695 * If we have filled up the sliding window, drop the oldest attempt;
696 * if the oldest attempt (highest bit in bitmap) shows "success",
697 * subtract "1" from the success counter (this is the main reason
698 * we keep these bitmaps!).
700 while (attempts > 0) {
701 if (window->counter >= IWL_RATE_MAX_WINDOW) {
702 /* remove earliest */
703 window->counter = IWL_RATE_MAX_WINDOW - 1;
705 if (window->data & mask) {
706 window->data &= ~mask;
707 window->success_counter--;
711 /* Increment frames-attempted counter */
714 /* Shift bitmap by one frame to throw away oldest history */
717 /* Mark the most recent #successes attempts as successful */
719 window->success_counter++;
727 /* Calculate current success ratio, avoid divide-by-0! */
728 if (window->counter > 0)
729 window->success_ratio = 128 * (100 * window->success_counter)
732 window->success_ratio = IWL_INVALID_VALUE;
734 fail_count = window->counter - window->success_counter;
736 /* Calculate average throughput, if we have enough history. */
737 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
738 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
739 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
741 window->average_tpt = IWL_INVALID_VALUE;
746 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
747 struct iwl_lq_sta *lq_sta,
748 struct iwl_scale_tbl_info *tbl,
749 int scale_index, int attempts, int successes,
752 struct iwl_rate_scale_data *window = NULL;
754 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
757 window = &tbl->tpc_win[reduced_txp];
758 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
762 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
763 struct iwl_lq_sta *lq_sta,
764 struct iwl_scale_tbl_info *tbl,
765 int scale_index, int attempts, int successes)
767 struct iwl_rate_scale_data *window = NULL;
769 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
772 if (tbl->column != RS_COLUMN_INVALID) {
773 struct lq_sta_pers *pers = &lq_sta->pers;
775 pers->tx_stats[tbl->column][scale_index].total += attempts;
776 pers->tx_stats[tbl->column][scale_index].success += successes;
779 /* Select window for current tx bit rate */
780 window = &(tbl->win[scale_index]);
781 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
785 /* Convert rs_rate object into ucode rate bitmask */
786 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
787 struct rs_rate *rate)
790 int index = rate->index;
792 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
793 RATE_MCS_ANT_ABC_MSK);
795 if (is_legacy(rate)) {
796 ucode_rate |= iwl_rates[index].plcp;
797 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
798 ucode_rate |= RATE_MCS_CCK_MSK;
803 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
804 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
805 index = IWL_LAST_HT_RATE;
807 ucode_rate |= RATE_MCS_HT_MSK;
809 if (is_ht_siso(rate))
810 ucode_rate |= iwl_rates[index].plcp_ht_siso;
811 else if (is_ht_mimo2(rate))
812 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
815 } else if (is_vht(rate)) {
816 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
817 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
818 index = IWL_LAST_VHT_RATE;
820 ucode_rate |= RATE_MCS_VHT_MSK;
821 if (is_vht_siso(rate))
822 ucode_rate |= iwl_rates[index].plcp_vht_siso;
823 else if (is_vht_mimo2(rate))
824 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
829 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
832 if (is_siso(rate) && rate->stbc) {
833 /* To enable STBC we need to set both a flag and ANT_AB */
834 ucode_rate |= RATE_MCS_ANT_AB_MSK;
835 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
838 ucode_rate |= rate->bw;
840 ucode_rate |= RATE_MCS_SGI_MSK;
842 ucode_rate |= RATE_MCS_LDPC_MSK;
847 /* Convert a ucode rate into an rs_rate object */
848 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
849 enum nl80211_band band,
850 struct rs_rate *rate)
852 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
853 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
856 memset(rate, 0, sizeof(*rate));
857 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
859 if (rate->index == IWL_RATE_INVALID)
862 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
865 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
866 !(ucode_rate & RATE_MCS_VHT_MSK)) {
867 if (num_of_ant == 1) {
868 if (band == NL80211_BAND_5GHZ)
869 rate->type = LQ_LEGACY_A;
871 rate->type = LQ_LEGACY_G;
878 if (ucode_rate & RATE_MCS_SGI_MSK)
880 if (ucode_rate & RATE_MCS_LDPC_MSK)
882 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
884 if (ucode_rate & RATE_MCS_BF_MSK)
887 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
889 if (ucode_rate & RATE_MCS_HT_MSK) {
890 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
891 RATE_HT_MCS_NSS_POS) + 1;
894 rate->type = LQ_HT_SISO;
895 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
897 rate->stbc, rate->bfer);
898 } else if (nss == 2) {
899 rate->type = LQ_HT_MIMO2;
900 WARN_ON_ONCE(num_of_ant != 2);
904 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
905 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
906 RATE_VHT_MCS_NSS_POS) + 1;
909 rate->type = LQ_VHT_SISO;
910 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
912 rate->stbc, rate->bfer);
913 } else if (nss == 2) {
914 rate->type = LQ_VHT_MIMO2;
915 WARN_ON_ONCE(num_of_ant != 2);
921 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
927 /* switch to another antenna/antennas and return 1 */
928 /* if no other valid antenna found, return 0 */
929 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
933 if (!rate->ant || rate->ant > ANT_ABC)
936 if (!rs_is_valid_ant(valid_ant, rate->ant))
939 new_ant_type = ant_toggle_lookup[rate->ant];
941 while ((new_ant_type != rate->ant) &&
942 !rs_is_valid_ant(valid_ant, new_ant_type))
943 new_ant_type = ant_toggle_lookup[new_ant_type];
945 if (new_ant_type == rate->ant)
948 rate->ant = new_ant_type;
953 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
954 struct rs_rate *rate)
957 return lq_sta->active_legacy_rate;
958 else if (is_siso(rate))
959 return lq_sta->active_siso_rate;
960 else if (is_mimo2(rate))
961 return lq_sta->active_mimo2_rate;
967 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
970 u8 high = IWL_RATE_INVALID;
971 u8 low = IWL_RATE_INVALID;
973 /* 802.11A or ht walks to the next literal adjacent rate in
975 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
979 /* Find the previous rate that is in the rate mask */
981 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
982 if (rate_mask & mask) {
988 /* Find the next rate that is in the rate mask */
990 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
991 if (rate_mask & mask) {
997 return (high << 8) | low;
1001 while (low != IWL_RATE_INVALID) {
1002 low = iwl_rates[low].prev_rs;
1003 if (low == IWL_RATE_INVALID)
1005 if (rate_mask & (1 << low))
1010 while (high != IWL_RATE_INVALID) {
1011 high = iwl_rates[high].next_rs;
1012 if (high == IWL_RATE_INVALID)
1014 if (rate_mask & (1 << high))
1018 return (high << 8) | low;
1021 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1022 struct rs_rate *rate)
1024 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1027 /* Get the next supported lower rate in the current column.
1028 * Return true if bottom rate in the current column was reached
1030 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1031 struct rs_rate *rate)
1036 struct iwl_mvm *mvm = lq_sta->pers.drv;
1038 rate_mask = rs_get_supported_rates(lq_sta, rate);
1039 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1041 low = high_low & 0xff;
1043 /* Bottom rate of column reached */
1044 if (low == IWL_RATE_INVALID)
1051 /* Get the next rate to use following a column downgrade */
1052 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1053 struct rs_rate *rate)
1055 struct iwl_mvm *mvm = lq_sta->pers.drv;
1057 if (is_legacy(rate)) {
1058 /* No column to downgrade from Legacy */
1060 } else if (is_siso(rate)) {
1061 /* Downgrade to Legacy if we were in SISO */
1062 if (lq_sta->band == NL80211_BAND_5GHZ)
1063 rate->type = LQ_LEGACY_A;
1065 rate->type = LQ_LEGACY_G;
1067 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1069 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1070 rate->index > IWL_RATE_MCS_9_INDEX);
1072 rate->index = rs_ht_to_legacy[rate->index];
1075 /* Downgrade to SISO with same MCS if in MIMO */
1076 rate->type = is_vht_mimo2(rate) ?
1077 LQ_VHT_SISO : LQ_HT_SISO;
1080 if (num_of_ant(rate->ant) > 1)
1081 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1083 /* Relevant in both switching to SISO or Legacy */
1086 if (!rs_rate_supported(lq_sta, rate))
1087 rs_get_lower_rate_in_column(lq_sta, rate);
1090 /* Check if both rates are identical
1091 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1092 * with a rate indicating STBC/BFER and ANT_AB.
1094 static inline bool rs_rate_equal(struct rs_rate *a,
1096 bool allow_ant_mismatch)
1099 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1100 (a->bfer == b->bfer);
1102 if (allow_ant_mismatch) {
1103 if (a->stbc || a->bfer) {
1104 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1105 a->stbc, a->bfer, a->ant);
1106 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1107 } else if (b->stbc || b->bfer) {
1108 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1109 b->stbc, b->bfer, b->ant);
1110 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1114 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1115 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1118 /* Check if both rates share the same column */
1119 static inline bool rs_rate_column_match(struct rs_rate *a,
1124 if (a->stbc || a->bfer)
1125 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1127 ant_match = (a->ant == b->ant);
1129 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1133 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1135 if (is_legacy(rate)) {
1136 if (rate->ant == ANT_A)
1137 return RS_COLUMN_LEGACY_ANT_A;
1139 if (rate->ant == ANT_B)
1140 return RS_COLUMN_LEGACY_ANT_B;
1145 if (is_siso(rate)) {
1146 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1147 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1148 RS_COLUMN_SISO_ANT_A;
1150 if (rate->ant == ANT_B)
1151 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1152 RS_COLUMN_SISO_ANT_B;
1158 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1161 return RS_COLUMN_INVALID;
1164 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1166 u8 tid = IWL_MAX_TID_COUNT;
1168 if (ieee80211_is_data_qos(hdr->frame_control)) {
1169 u8 *qc = ieee80211_get_qos_ctl(hdr);
1173 if (unlikely(tid > IWL_MAX_TID_COUNT))
1174 tid = IWL_MAX_TID_COUNT;
1179 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1180 int tid, struct ieee80211_tx_info *info, bool ndp)
1185 struct iwl_lq_cmd *table;
1187 struct rs_rate lq_rate, tx_resp_rate;
1188 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1189 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1190 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1191 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1192 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1193 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1194 IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1196 /* Treat uninitialized rate scaling data same as non-existing. */
1198 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1200 } else if (!lq_sta->pers.drv) {
1201 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1205 /* This packet was aggregated but doesn't carry status info */
1206 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1207 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1210 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
1216 #ifdef CONFIG_MAC80211_DEBUGFS
1217 /* Disable last tx check if we are debugging with fixed rate but
1218 * update tx stats */
1219 if (lq_sta->pers.dbg_fixed_rate) {
1220 int index = tx_resp_rate.index;
1221 enum rs_column column;
1222 int attempts, success;
1224 column = rs_get_column_from_rate(&tx_resp_rate);
1225 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1226 "Can't map rate 0x%x to column",
1230 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1231 attempts = info->status.ampdu_len;
1232 success = info->status.ampdu_ack_len;
1234 attempts = info->status.rates[0].count;
1235 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1238 lq_sta->pers.tx_stats[column][index].total += attempts;
1239 lq_sta->pers.tx_stats[column][index].success += success;
1241 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1242 tx_resp_hwrate, success, attempts);
1247 if (time_after(jiffies,
1248 (unsigned long)(lq_sta->last_tx +
1249 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1252 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1253 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1254 ieee80211_stop_tx_ba_session(sta, t);
1256 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1259 lq_sta->last_tx = jiffies;
1261 /* Ignore this Tx frame response if its initial rate doesn't match
1262 * that of latest Link Quality command. There may be stragglers
1263 * from a previous Link Quality command, but we're no longer interested
1264 * in those; they're either from the "active" mode while we're trying
1265 * to check "search" mode, or a prior "search" mode after we've moved
1266 * to a new "search" mode (which might become the new "active" mode).
1268 table = &lq_sta->lq;
1269 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1270 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
1275 /* Here we actually compare this rate to the latest LQ command */
1276 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1278 "initial tx resp rate 0x%x does not match 0x%x\n",
1279 tx_resp_hwrate, lq_hwrate);
1282 * Since rates mis-match, the last LQ command may have failed.
1283 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1286 lq_sta->missed_rate_counter++;
1287 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1288 lq_sta->missed_rate_counter = 0;
1290 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1292 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1294 /* Regardless, ignore this status info for outdated rate */
1297 /* Rate did match, so reset the missed_rate_counter */
1298 lq_sta->missed_rate_counter = 0;
1300 if (!lq_sta->search_better_tbl) {
1301 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1302 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1304 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1305 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1308 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1310 "Neither active nor search matches tx rate\n");
1311 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1312 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1313 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1314 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1315 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1318 * no matching table found, let's by-pass the data collection
1319 * and continue to perform rate scale to find the rate table
1321 rs_stay_in_table(lq_sta, true);
1326 * Updating the frame history depends on whether packets were
1329 * For aggregation, all packets were transmitted at the same rate, the
1330 * first index into rate scale table.
1332 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1333 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1334 info->status.ampdu_len,
1335 info->status.ampdu_ack_len,
1338 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1339 * it as a single frame loss as we don't want the success ratio
1340 * to dip too quickly because a BA wasn't received.
1341 * For TPC, there's no need for this optimisation since we want
1342 * to recover very quickly from a bad power reduction and,
1343 * therefore we'd like the success ratio to get an immediate hit
1344 * when failing to get a BA, so we'd switch back to a lower or
1345 * zero power reduction. When FW transmits agg with a rate
1346 * different from the initial rate, it will not use reduced txp
1347 * and will send BA notification twice (one empty with reduced
1348 * txp equal to the value from LQ and one with reduced txp 0).
1349 * We need to update counters for each txp level accordingly.
1351 if (info->status.ampdu_ack_len == 0)
1352 info->status.ampdu_len = 1;
1354 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1355 info->status.ampdu_len,
1356 info->status.ampdu_ack_len);
1358 /* Update success/fail counts if not searching for new mode */
1359 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1360 lq_sta->total_success += info->status.ampdu_ack_len;
1361 lq_sta->total_failed += (info->status.ampdu_len -
1362 info->status.ampdu_ack_len);
1365 /* For legacy, update frame history with for each Tx retry. */
1366 retries = info->status.rates[0].count - 1;
1367 /* HW doesn't send more than 15 retries */
1368 retries = min(retries, 15);
1370 /* The last transmission may have been successful */
1371 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1372 /* Collect data for each rate used during failed TX attempts */
1373 for (i = 0; i <= retries; ++i) {
1374 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1375 if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
1382 * Only collect stats if retried rate is in the same RS
1383 * table as active/search.
1385 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1387 else if (rs_rate_column_match(&lq_rate,
1389 tmp_tbl = other_tbl;
1393 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1395 i < retries ? 0 : legacy_success,
1397 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1399 i < retries ? 0 : legacy_success);
1402 /* Update success/fail counts if not searching for new mode */
1403 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1404 lq_sta->total_success += legacy_success;
1405 lq_sta->total_failed += retries + (1 - legacy_success);
1408 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1409 lq_sta->last_rate_n_flags = lq_hwrate;
1410 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1412 /* See if there's a better rate or modulation mode to try. */
1413 if (sta->supp_rates[info->band])
1414 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1418 * mac80211 sends us Tx status
1420 static void rs_mac80211_tx_status(void *mvm_r,
1421 struct ieee80211_supported_band *sband,
1422 struct ieee80211_sta *sta, void *priv_sta,
1423 struct sk_buff *skb)
1425 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1426 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1427 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1428 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1430 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1433 if (!ieee80211_is_data(hdr->frame_control) ||
1434 info->flags & IEEE80211_TX_CTL_NO_ACK)
1437 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1438 ieee80211_is_qos_nullfunc(hdr->frame_control));
1442 * Begin a period of staying with a selected modulation mode.
1443 * Set "stay_in_tbl" flag to prevent any mode switches.
1444 * Set frame tx success limits according to legacy vs. high-throughput,
1445 * and reset overall (spanning all rates) tx success history statistics.
1446 * These control how long we stay using same modulation mode before
1447 * searching for a new mode.
1449 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1450 struct iwl_lq_sta *lq_sta)
1452 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1453 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1455 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1456 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1457 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1459 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1460 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1461 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1463 lq_sta->table_count = 0;
1464 lq_sta->total_failed = 0;
1465 lq_sta->total_success = 0;
1466 lq_sta->flush_timer = jiffies;
1467 lq_sta->visited_columns = 0;
1470 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1473 return find_last_bit(&rate_mask, BITS_PER_LONG);
1474 return IWL_RATE_INVALID;
1477 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1478 const struct rs_tx_column *column)
1480 switch (column->mode) {
1482 return lq_sta->max_legacy_rate_idx;
1484 return lq_sta->max_siso_rate_idx;
1486 return lq_sta->max_mimo2_rate_idx;
1491 return lq_sta->max_legacy_rate_idx;
1494 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1495 const struct rs_tx_column *column,
1498 /* Used to choose among HT tables */
1499 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1501 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1502 column->mode != RS_SISO &&
1503 column->mode != RS_MIMO2))
1504 return expected_tpt_legacy;
1506 /* Legacy rates have only one table */
1507 if (column->mode == RS_LEGACY)
1508 return expected_tpt_legacy;
1510 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1511 /* Choose among many HT tables depending on number of streams
1512 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1514 if (column->mode == RS_SISO) {
1516 case RATE_MCS_CHAN_WIDTH_20:
1517 ht_tbl_pointer = expected_tpt_siso_20MHz;
1519 case RATE_MCS_CHAN_WIDTH_40:
1520 ht_tbl_pointer = expected_tpt_siso_40MHz;
1522 case RATE_MCS_CHAN_WIDTH_80:
1523 ht_tbl_pointer = expected_tpt_siso_80MHz;
1525 case RATE_MCS_CHAN_WIDTH_160:
1526 ht_tbl_pointer = expected_tpt_siso_160MHz;
1531 } else if (column->mode == RS_MIMO2) {
1533 case RATE_MCS_CHAN_WIDTH_20:
1534 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1536 case RATE_MCS_CHAN_WIDTH_40:
1537 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1539 case RATE_MCS_CHAN_WIDTH_80:
1540 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1542 case RATE_MCS_CHAN_WIDTH_160:
1543 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1552 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1553 return ht_tbl_pointer[0];
1554 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1555 return ht_tbl_pointer[1];
1556 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1557 return ht_tbl_pointer[2];
1559 return ht_tbl_pointer[3];
1562 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1563 struct iwl_scale_tbl_info *tbl)
1565 struct rs_rate *rate = &tbl->rate;
1566 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1568 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1571 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1572 struct iwl_lq_sta *lq_sta,
1573 struct iwl_scale_tbl_info *tbl, /* "search" */
1574 unsigned long rate_mask, s8 index)
1576 struct iwl_scale_tbl_info *active_tbl =
1577 &(lq_sta->lq_info[lq_sta->active_tbl]);
1578 s32 success_ratio = active_tbl->win[index].success_ratio;
1579 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1580 const u16 *tpt_tbl = tbl->expected_tpt;
1585 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1586 target_tpt = 100 * expected_current_tpt;
1588 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1589 success_ratio, target_tpt);
1591 target_tpt = lq_sta->last_tpt;
1593 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1594 success_ratio, target_tpt);
1597 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1599 while (rate_idx != IWL_RATE_INVALID) {
1600 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1603 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1606 rate_idx = (high_low >> 8) & 0xff;
1609 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1610 rate_idx, target_tpt,
1611 rate_idx != IWL_RATE_INVALID ?
1612 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1617 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1619 switch (sta->bandwidth) {
1620 case IEEE80211_STA_RX_BW_160:
1621 return RATE_MCS_CHAN_WIDTH_160;
1622 case IEEE80211_STA_RX_BW_80:
1623 return RATE_MCS_CHAN_WIDTH_80;
1624 case IEEE80211_STA_RX_BW_40:
1625 return RATE_MCS_CHAN_WIDTH_40;
1626 case IEEE80211_STA_RX_BW_20:
1628 return RATE_MCS_CHAN_WIDTH_20;
1633 * Check whether we should continue using same modulation mode, or
1634 * begin search for a new mode, based on:
1635 * 1) # tx successes or failures while using this mode
1636 * 2) # times calling this function
1637 * 3) elapsed time in this mode (not used, for now)
1639 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1641 struct iwl_scale_tbl_info *tbl;
1643 int flush_interval_passed = 0;
1644 struct iwl_mvm *mvm;
1646 mvm = lq_sta->pers.drv;
1647 active_tbl = lq_sta->active_tbl;
1649 tbl = &(lq_sta->lq_info[active_tbl]);
1651 /* If we've been disallowing search, see if we should now allow it */
1652 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1653 /* Elapsed time using current modulation mode */
1654 if (lq_sta->flush_timer)
1655 flush_interval_passed =
1657 (unsigned long)(lq_sta->flush_timer +
1658 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1661 * Check if we should allow search for new modulation mode.
1662 * If many frames have failed or succeeded, or we've used
1663 * this same modulation for a long time, allow search, and
1664 * reset history stats that keep track of whether we should
1665 * allow a new search. Also (below) reset all bitmaps and
1666 * stats in active history.
1669 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1670 (lq_sta->total_success > lq_sta->max_success_limit) ||
1671 ((!lq_sta->search_better_tbl) &&
1672 (lq_sta->flush_timer) && (flush_interval_passed))) {
1674 "LQ: stay is expired %d %d %d\n",
1675 lq_sta->total_failed,
1676 lq_sta->total_success,
1677 flush_interval_passed);
1679 /* Allow search for new mode */
1680 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1682 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1683 lq_sta->total_failed = 0;
1684 lq_sta->total_success = 0;
1685 lq_sta->flush_timer = 0;
1686 /* mark the current column as visited */
1687 lq_sta->visited_columns = BIT(tbl->column);
1689 * Else if we've used this modulation mode enough repetitions
1690 * (regardless of elapsed time or success/failure), reset
1691 * history bitmaps and rate-specific stats for all rates in
1695 lq_sta->table_count++;
1696 if (lq_sta->table_count >=
1697 lq_sta->table_count_limit) {
1698 lq_sta->table_count = 0;
1701 "LQ: stay in table clear win\n");
1702 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1706 /* If transitioning to allow "search", reset all history
1707 * bitmaps and stats in active table (this will become the new
1708 * "search" table). */
1709 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1710 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1715 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1716 struct iwl_scale_tbl_info *tbl,
1717 enum rs_action scale_action)
1719 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1721 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1722 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1723 scale_action == RS_ACTION_DOWNSCALE)
1724 sta_priv->tlc_amsdu = false;
1726 sta_priv->tlc_amsdu = true;
1730 * setup rate table in uCode
1732 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1733 struct ieee80211_sta *sta,
1734 struct iwl_lq_sta *lq_sta,
1735 struct iwl_scale_tbl_info *tbl)
1737 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1738 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1741 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1742 struct ieee80211_sta *sta,
1743 struct iwl_lq_sta *lq_sta,
1744 struct iwl_scale_tbl_info *tbl,
1745 enum rs_action scale_action)
1747 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1750 if (!is_vht_siso(&tbl->rate))
1753 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1754 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1755 (scale_action == RS_ACTION_DOWNSCALE)) {
1756 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1757 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1758 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1762 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1763 * sustainable, i.e. we're past the test window. We can't go back
1764 * if MCS5 is just tested as this will happen always after switching
1765 * to 20Mhz MCS4 because the rate stats are cleared.
1767 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1768 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1769 (scale_action == RS_ACTION_STAY)) ||
1770 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1771 (scale_action == RS_ACTION_UPSCALE)))) {
1772 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1773 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1774 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1781 rs_set_expected_tpt_table(lq_sta, tbl);
1782 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1786 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1787 struct iwl_lq_sta *lq_sta,
1788 struct ieee80211_sta *sta,
1789 struct iwl_scale_tbl_info *tbl)
1792 enum rs_column next_col_id;
1793 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1794 const struct rs_tx_column *next_col;
1795 allow_column_func_t allow_func;
1796 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1797 const u16 *expected_tpt_tbl;
1798 u16 tpt, max_expected_tpt;
1800 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1801 next_col_id = curr_col->next_columns[i];
1803 if (next_col_id == RS_COLUMN_INVALID)
1806 if (lq_sta->visited_columns & BIT(next_col_id)) {
1807 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1812 next_col = &rs_tx_columns[next_col_id];
1814 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1816 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1817 next_col_id, valid_ants, next_col->ant);
1821 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1822 allow_func = next_col->checks[j];
1823 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1828 if (j != MAX_COLUMN_CHECKS) {
1830 "Skip column %d: not allowed (check %d failed)\n",
1836 tpt = lq_sta->last_tpt / 100;
1837 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1838 rs_bw_from_sta_bw(sta));
1839 if (WARN_ON_ONCE(!expected_tpt_tbl))
1842 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1843 if (max_rate == IWL_RATE_INVALID) {
1845 "Skip column %d: no rate is allowed in this column\n",
1850 max_expected_tpt = expected_tpt_tbl[max_rate];
1851 if (tpt >= max_expected_tpt) {
1853 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1854 next_col_id, max_expected_tpt, tpt);
1859 "Found potential column %d. Max expected %d current %d\n",
1860 next_col_id, max_expected_tpt, tpt);
1864 if (i == MAX_NEXT_COLUMNS)
1865 return RS_COLUMN_INVALID;
1870 static int rs_switch_to_column(struct iwl_mvm *mvm,
1871 struct iwl_lq_sta *lq_sta,
1872 struct ieee80211_sta *sta,
1873 enum rs_column col_id)
1875 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1876 struct iwl_scale_tbl_info *search_tbl =
1877 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1878 struct rs_rate *rate = &search_tbl->rate;
1879 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1880 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1881 unsigned long rate_mask = 0;
1884 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1886 rate->sgi = column->sgi;
1887 rate->ant = column->ant;
1889 if (column->mode == RS_LEGACY) {
1890 if (lq_sta->band == NL80211_BAND_5GHZ)
1891 rate->type = LQ_LEGACY_A;
1893 rate->type = LQ_LEGACY_G;
1895 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1897 rate_mask = lq_sta->active_legacy_rate;
1898 } else if (column->mode == RS_SISO) {
1899 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1900 rate_mask = lq_sta->active_siso_rate;
1901 } else if (column->mode == RS_MIMO2) {
1902 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1903 rate_mask = lq_sta->active_mimo2_rate;
1905 WARN_ONCE(1, "Bad column mode");
1908 if (column->mode != RS_LEGACY) {
1909 rate->bw = rs_bw_from_sta_bw(sta);
1910 rate->ldpc = lq_sta->ldpc;
1913 search_tbl->column = col_id;
1914 rs_set_expected_tpt_table(lq_sta, search_tbl);
1916 lq_sta->visited_columns |= BIT(col_id);
1918 /* Get the best matching rate if we're changing modes. e.g.
1919 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1921 if (curr_column->mode != column->mode) {
1922 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1923 rate_mask, rate->index);
1925 if ((rate_idx == IWL_RATE_INVALID) ||
1926 !(BIT(rate_idx) & rate_mask)) {
1928 "can not switch with index %d"
1930 rate_idx, rate_mask);
1935 rate->index = rate_idx;
1938 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1939 col_id, rate->index);
1944 rate->type = LQ_NONE;
1948 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1949 struct iwl_scale_tbl_info *tbl,
1950 s32 sr, int low, int high,
1952 int low_tpt, int high_tpt)
1954 enum rs_action action = RS_ACTION_STAY;
1956 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1957 (current_tpt == 0)) {
1959 "Decrease rate because of low SR\n");
1960 return RS_ACTION_DOWNSCALE;
1963 if ((low_tpt == IWL_INVALID_VALUE) &&
1964 (high_tpt == IWL_INVALID_VALUE) &&
1965 (high != IWL_RATE_INVALID)) {
1967 "No data about high/low rates. Increase rate\n");
1968 return RS_ACTION_UPSCALE;
1971 if ((high_tpt == IWL_INVALID_VALUE) &&
1972 (high != IWL_RATE_INVALID) &&
1973 (low_tpt != IWL_INVALID_VALUE) &&
1974 (low_tpt < current_tpt)) {
1976 "No data about high rate and low rate is worse. Increase rate\n");
1977 return RS_ACTION_UPSCALE;
1980 if ((high_tpt != IWL_INVALID_VALUE) &&
1981 (high_tpt > current_tpt)) {
1983 "Higher rate is better. Increate rate\n");
1984 return RS_ACTION_UPSCALE;
1987 if ((low_tpt != IWL_INVALID_VALUE) &&
1988 (high_tpt != IWL_INVALID_VALUE) &&
1989 (low_tpt < current_tpt) &&
1990 (high_tpt < current_tpt)) {
1992 "Both high and low are worse. Maintain rate\n");
1993 return RS_ACTION_STAY;
1996 if ((low_tpt != IWL_INVALID_VALUE) &&
1997 (low_tpt > current_tpt)) {
1999 "Lower rate is better\n");
2000 action = RS_ACTION_DOWNSCALE;
2004 if ((low_tpt == IWL_INVALID_VALUE) &&
2005 (low != IWL_RATE_INVALID)) {
2007 "No data about lower rate\n");
2008 action = RS_ACTION_DOWNSCALE;
2012 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2015 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2016 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2018 "SR is above NO DECREASE. Avoid downscale\n");
2019 action = RS_ACTION_STAY;
2020 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2022 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2023 action = RS_ACTION_STAY;
2025 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2032 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2033 struct iwl_lq_sta *lq_sta)
2035 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2036 * supports STBC of at least 1*SS
2038 if (!lq_sta->stbc_capable)
2041 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2047 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2048 int *weaker, int *stronger)
2050 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2051 if (*weaker > TPC_MAX_REDUCTION)
2052 *weaker = TPC_INVALID;
2054 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2056 *stronger = TPC_INVALID;
2059 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2060 struct rs_rate *rate, enum nl80211_band band)
2062 int index = rate->index;
2063 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2064 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2067 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2068 cam, sta_ps_disabled);
2070 * allow tpc only if power management is enabled, or bt coex
2071 * activity grade allows it and we are on 2.4Ghz.
2073 if ((cam || sta_ps_disabled) &&
2074 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2077 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2078 if (is_legacy(rate))
2079 return index == IWL_RATE_54M_INDEX;
2081 return index == IWL_RATE_MCS_7_INDEX;
2083 return index == IWL_RATE_MCS_7_INDEX ||
2084 index == IWL_RATE_MCS_8_INDEX ||
2085 index == IWL_RATE_MCS_9_INDEX;
2093 TPC_ACTION_DECREASE,
2094 TPC_ACTION_INCREASE,
2095 TPC_ACTION_NO_RESTIRCTION,
2098 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2099 s32 sr, int weak, int strong,
2101 int weak_tpt, int strong_tpt)
2103 /* stay until we have valid tpt */
2104 if (current_tpt == IWL_INVALID_VALUE) {
2105 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2106 return TPC_ACTION_STAY;
2109 /* Too many failures, increase txp */
2110 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2112 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2113 return TPC_ACTION_NO_RESTIRCTION;
2116 /* try decreasing first if applicable */
2117 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2118 weak != TPC_INVALID) {
2119 if (weak_tpt == IWL_INVALID_VALUE &&
2120 (strong_tpt == IWL_INVALID_VALUE ||
2121 current_tpt >= strong_tpt)) {
2123 "no weak txp measurement. decrease txp\n");
2124 return TPC_ACTION_DECREASE;
2127 if (weak_tpt > current_tpt) {
2129 "lower txp has better tpt. decrease txp\n");
2130 return TPC_ACTION_DECREASE;
2134 /* next, increase if needed */
2135 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2136 strong != TPC_INVALID) {
2137 if (weak_tpt == IWL_INVALID_VALUE &&
2138 strong_tpt != IWL_INVALID_VALUE &&
2139 current_tpt < strong_tpt) {
2141 "higher txp has better tpt. increase txp\n");
2142 return TPC_ACTION_INCREASE;
2145 if (weak_tpt < current_tpt &&
2146 (strong_tpt == IWL_INVALID_VALUE ||
2147 strong_tpt > current_tpt)) {
2149 "lower txp has worse tpt. increase txp\n");
2150 return TPC_ACTION_INCREASE;
2154 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2155 return TPC_ACTION_STAY;
2158 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2159 struct ieee80211_sta *sta,
2160 struct iwl_lq_sta *lq_sta,
2161 struct iwl_scale_tbl_info *tbl)
2163 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2164 struct ieee80211_vif *vif = mvm_sta->vif;
2165 struct ieee80211_chanctx_conf *chanctx_conf;
2166 enum nl80211_band band;
2167 struct iwl_rate_scale_data *window;
2168 struct rs_rate *rate = &tbl->rate;
2169 enum tpc_action action;
2171 u8 cur = lq_sta->lq.reduced_tpc;
2174 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2176 #ifdef CONFIG_MAC80211_DEBUGFS
2177 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2178 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2179 lq_sta->pers.dbg_fixed_txp_reduction);
2180 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2181 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2186 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2187 if (WARN_ON(!chanctx_conf))
2188 band = NUM_NL80211_BANDS;
2190 band = chanctx_conf->def.chan->band;
2193 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2195 "tpc is not allowed. remove txp restrictions\n");
2196 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2197 return cur != TPC_NO_REDUCTION;
2200 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2202 /* Collect measured throughputs for current and adjacent rates */
2203 window = tbl->tpc_win;
2204 sr = window[cur].success_ratio;
2205 current_tpt = window[cur].average_tpt;
2206 if (weak != TPC_INVALID)
2207 weak_tpt = window[weak].average_tpt;
2208 if (strong != TPC_INVALID)
2209 strong_tpt = window[strong].average_tpt;
2212 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2213 cur, current_tpt, sr, weak, strong,
2214 weak_tpt, strong_tpt);
2216 action = rs_get_tpc_action(mvm, sr, weak, strong,
2217 current_tpt, weak_tpt, strong_tpt);
2219 /* override actions if we are on the edge */
2220 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2221 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2222 action = TPC_ACTION_STAY;
2223 } else if (strong == TPC_INVALID &&
2224 (action == TPC_ACTION_INCREASE ||
2225 action == TPC_ACTION_NO_RESTIRCTION)) {
2226 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2227 action = TPC_ACTION_STAY;
2231 case TPC_ACTION_DECREASE:
2232 lq_sta->lq.reduced_tpc = weak;
2234 case TPC_ACTION_INCREASE:
2235 lq_sta->lq.reduced_tpc = strong;
2237 case TPC_ACTION_NO_RESTIRCTION:
2238 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2240 case TPC_ACTION_STAY:
2248 * Do rate scaling and search for new modulation mode.
2250 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2251 struct ieee80211_sta *sta,
2252 struct iwl_lq_sta *lq_sta,
2255 int low = IWL_RATE_INVALID;
2256 int high = IWL_RATE_INVALID;
2258 struct iwl_rate_scale_data *window = NULL;
2259 int current_tpt = IWL_INVALID_VALUE;
2260 int low_tpt = IWL_INVALID_VALUE;
2261 int high_tpt = IWL_INVALID_VALUE;
2263 enum rs_action scale_action = RS_ACTION_STAY;
2266 struct iwl_scale_tbl_info *tbl, *tbl1;
2271 u8 prev_agg = lq_sta->is_agg;
2272 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2273 struct iwl_mvm_tid_data *tid_data;
2274 struct rs_rate *rate;
2276 lq_sta->is_agg = !!sta_priv->agg_tids;
2279 * Select rate-scale / modulation-mode table to work with in
2280 * the rest of this function: "search" if searching for better
2281 * modulation mode, or "active" if doing rate scaling within a mode.
2283 if (!lq_sta->search_better_tbl)
2284 active_tbl = lq_sta->active_tbl;
2286 active_tbl = 1 - lq_sta->active_tbl;
2288 tbl = &(lq_sta->lq_info[active_tbl]);
2291 if (prev_agg != lq_sta->is_agg) {
2293 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2294 prev_agg, lq_sta->is_agg);
2295 rs_set_expected_tpt_table(lq_sta, tbl);
2296 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2299 /* current tx rate */
2300 index = rate->index;
2302 /* rates available for this association, and for modulation mode */
2303 rate_mask = rs_get_supported_rates(lq_sta, rate);
2305 if (!(BIT(index) & rate_mask)) {
2306 IWL_ERR(mvm, "Current Rate is not valid\n");
2307 if (lq_sta->search_better_tbl) {
2308 /* revert to active table if search table is not valid*/
2309 rate->type = LQ_NONE;
2310 lq_sta->search_better_tbl = 0;
2311 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2312 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2317 /* Get expected throughput table and history window for current rate */
2318 if (!tbl->expected_tpt) {
2319 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2323 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2324 window = &(tbl->win[index]);
2327 * If there is not enough history to calculate actual average
2328 * throughput, keep analyzing results of more tx frames, without
2329 * changing rate or mode (bypass most of the rest of this function).
2330 * Set up new rate table in uCode only if old rate is not supported
2331 * in current association (use new rate found above).
2333 fail_count = window->counter - window->success_counter;
2334 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2335 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2337 "%s: Test Window: succ %d total %d\n",
2338 rs_pretty_rate(rate),
2339 window->success_counter, window->counter);
2341 /* Can't calculate this yet; not enough history */
2342 window->average_tpt = IWL_INVALID_VALUE;
2344 /* Should we stay with this modulation mode,
2345 * or search for a new one? */
2346 rs_stay_in_table(lq_sta, false);
2351 /* If we are searching for better modulation mode, check success. */
2352 if (lq_sta->search_better_tbl) {
2353 /* If good success, continue using the "search" mode;
2354 * no need to send new link quality command, since we're
2355 * continuing to use the setup that we've been trying. */
2356 if (window->average_tpt > lq_sta->last_tpt) {
2358 "SWITCHING TO NEW TABLE SR: %d "
2359 "cur-tpt %d old-tpt %d\n",
2360 window->success_ratio,
2361 window->average_tpt,
2364 /* Swap tables; "search" becomes "active" */
2365 lq_sta->active_tbl = active_tbl;
2366 current_tpt = window->average_tpt;
2367 /* Else poor success; go back to mode in "active" table */
2370 "GOING BACK TO THE OLD TABLE: SR %d "
2371 "cur-tpt %d old-tpt %d\n",
2372 window->success_ratio,
2373 window->average_tpt,
2376 /* Nullify "search" table */
2377 rate->type = LQ_NONE;
2379 /* Revert to "active" table */
2380 active_tbl = lq_sta->active_tbl;
2381 tbl = &(lq_sta->lq_info[active_tbl]);
2383 /* Revert to "active" rate and throughput info */
2384 index = tbl->rate.index;
2385 current_tpt = lq_sta->last_tpt;
2387 /* Need to set up a new rate table in uCode */
2391 /* Either way, we've made a decision; modulation mode
2392 * search is done, allow rate adjustment next time. */
2393 lq_sta->search_better_tbl = 0;
2394 done_search = 1; /* Don't switch modes below! */
2398 /* (Else) not in search of better modulation mode, try for better
2399 * starting rate, while staying in this mode. */
2400 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2401 low = high_low & 0xff;
2402 high = (high_low >> 8) & 0xff;
2404 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2406 sr = window->success_ratio;
2408 /* Collect measured throughputs for current and adjacent rates */
2409 current_tpt = window->average_tpt;
2410 if (low != IWL_RATE_INVALID)
2411 low_tpt = tbl->win[low].average_tpt;
2412 if (high != IWL_RATE_INVALID)
2413 high_tpt = tbl->win[high].average_tpt;
2416 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2417 rs_pretty_rate(rate), current_tpt, sr,
2418 low, high, low_tpt, high_tpt);
2420 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2421 current_tpt, low_tpt, high_tpt);
2423 /* Force a search in case BT doesn't like us being in MIMO */
2424 if (is_mimo(rate) &&
2425 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2427 "BT Coex forbids MIMO. Search for new config\n");
2428 rs_stay_in_table(lq_sta, true);
2432 switch (scale_action) {
2433 case RS_ACTION_DOWNSCALE:
2434 /* Decrease starting rate, update uCode's rate table */
2435 if (low != IWL_RATE_INVALID) {
2440 "At the bottom rate. Can't decrease\n");
2444 case RS_ACTION_UPSCALE:
2445 /* Increase starting rate, update uCode's rate table */
2446 if (high != IWL_RATE_INVALID) {
2451 "At the top rate. Can't increase\n");
2455 case RS_ACTION_STAY:
2457 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2458 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2465 /* Replace uCode's rate table for the destination station. */
2467 tbl->rate.index = index;
2468 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2469 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2470 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2471 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2474 rs_stay_in_table(lq_sta, false);
2477 * Search for new modulation mode if we're:
2478 * 1) Not changing rates right now
2479 * 2) Not just finishing up a search
2480 * 3) Allowing a new search
2482 if (!update_lq && !done_search &&
2483 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2484 && window->counter) {
2485 enum rs_column next_column;
2487 /* Save current throughput to compare with "search" throughput*/
2488 lq_sta->last_tpt = current_tpt;
2491 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2492 update_lq, done_search, lq_sta->rs_state,
2495 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2496 if (next_column != RS_COLUMN_INVALID) {
2497 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2500 lq_sta->search_better_tbl = 1;
2503 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2504 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2507 /* If new "search" mode was selected, set up in uCode table */
2508 if (lq_sta->search_better_tbl) {
2509 /* Access the "search" table, clear its history. */
2510 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2511 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2513 /* Use new "search" start rate */
2514 index = tbl->rate.index;
2516 rs_dump_rate(mvm, &tbl->rate,
2517 "Switch to SEARCH TABLE:");
2518 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2524 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2525 /* If the "active" (non-search) mode was legacy,
2526 * and we've tried switching antennas,
2527 * but we haven't been able to try HT modes (not available),
2528 * stay with best antenna legacy modulation for a while
2529 * before next round of mode comparisons. */
2530 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2531 if (is_legacy(&tbl1->rate)) {
2532 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2534 if (tid != IWL_MAX_TID_COUNT) {
2535 tid_data = &sta_priv->tid_data[tid];
2536 if (tid_data->state != IWL_AGG_OFF) {
2538 "Stop aggregation on tid %d\n",
2540 ieee80211_stop_tx_ba_session(sta, tid);
2543 rs_set_stay_in_table(mvm, 1, lq_sta);
2545 /* If we're in an HT mode, and all 3 mode switch actions
2546 * have been tried and compared, stay in this best modulation
2547 * mode for a while before next round of mode comparisons. */
2548 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2549 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2550 (tid != IWL_MAX_TID_COUNT)) {
2551 tid_data = &sta_priv->tid_data[tid];
2552 if (tid_data->state == IWL_AGG_OFF && !ndp) {
2554 "try to aggregate tid %d\n",
2556 rs_tl_turn_on_agg(mvm, tid,
2560 rs_set_stay_in_table(mvm, 0, lq_sta);
2565 struct rs_init_rate_info {
2570 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2571 { -60, IWL_RATE_54M_INDEX },
2572 { -64, IWL_RATE_48M_INDEX },
2573 { -68, IWL_RATE_36M_INDEX },
2574 { -80, IWL_RATE_24M_INDEX },
2575 { -84, IWL_RATE_18M_INDEX },
2576 { -85, IWL_RATE_12M_INDEX },
2577 { -86, IWL_RATE_11M_INDEX },
2578 { -88, IWL_RATE_5M_INDEX },
2579 { -90, IWL_RATE_2M_INDEX },
2580 { S8_MIN, IWL_RATE_1M_INDEX },
2583 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2584 { -60, IWL_RATE_54M_INDEX },
2585 { -64, IWL_RATE_48M_INDEX },
2586 { -72, IWL_RATE_36M_INDEX },
2587 { -80, IWL_RATE_24M_INDEX },
2588 { -84, IWL_RATE_18M_INDEX },
2589 { -85, IWL_RATE_12M_INDEX },
2590 { -87, IWL_RATE_9M_INDEX },
2591 { S8_MIN, IWL_RATE_6M_INDEX },
2594 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2595 { -60, IWL_RATE_MCS_7_INDEX },
2596 { -64, IWL_RATE_MCS_6_INDEX },
2597 { -68, IWL_RATE_MCS_5_INDEX },
2598 { -72, IWL_RATE_MCS_4_INDEX },
2599 { -80, IWL_RATE_MCS_3_INDEX },
2600 { -84, IWL_RATE_MCS_2_INDEX },
2601 { -85, IWL_RATE_MCS_1_INDEX },
2602 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2605 /* MCS index 9 is not valid for 20MHz VHT channel width,
2606 * but is ok for 40, 80 and 160MHz channels.
2608 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2609 { -60, IWL_RATE_MCS_8_INDEX },
2610 { -64, IWL_RATE_MCS_7_INDEX },
2611 { -68, IWL_RATE_MCS_6_INDEX },
2612 { -72, IWL_RATE_MCS_5_INDEX },
2613 { -80, IWL_RATE_MCS_4_INDEX },
2614 { -84, IWL_RATE_MCS_3_INDEX },
2615 { -85, IWL_RATE_MCS_2_INDEX },
2616 { -87, IWL_RATE_MCS_1_INDEX },
2617 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2620 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2621 { -60, IWL_RATE_MCS_9_INDEX },
2622 { -64, IWL_RATE_MCS_8_INDEX },
2623 { -68, IWL_RATE_MCS_7_INDEX },
2624 { -72, IWL_RATE_MCS_6_INDEX },
2625 { -80, IWL_RATE_MCS_5_INDEX },
2626 { -84, IWL_RATE_MCS_4_INDEX },
2627 { -85, IWL_RATE_MCS_3_INDEX },
2628 { -87, IWL_RATE_MCS_2_INDEX },
2629 { -88, IWL_RATE_MCS_1_INDEX },
2630 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2633 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2635 /* Init the optimal rate based on STA caps
2636 * This combined with rssi is used to report the last tx rate
2637 * to userspace when we haven't transmitted enough frames.
2639 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2640 struct ieee80211_sta *sta,
2641 struct iwl_lq_sta *lq_sta)
2643 struct rs_rate *rate = &lq_sta->optimal_rate;
2645 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2646 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2647 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2648 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2649 else if (lq_sta->band == NL80211_BAND_5GHZ)
2650 rate->type = LQ_LEGACY_A;
2652 rate->type = LQ_LEGACY_G;
2654 rate->bw = rs_bw_from_sta_bw(sta);
2655 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2657 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2659 if (is_mimo(rate)) {
2660 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2661 } else if (is_siso(rate)) {
2662 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2664 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2666 if (lq_sta->band == NL80211_BAND_5GHZ) {
2667 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2668 lq_sta->optimal_nentries =
2669 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2671 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2672 lq_sta->optimal_nentries =
2673 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2678 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2679 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2680 lq_sta->optimal_nentries =
2681 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2683 lq_sta->optimal_rates = rs_optimal_rates_vht;
2684 lq_sta->optimal_nentries =
2685 ARRAY_SIZE(rs_optimal_rates_vht);
2687 } else if (is_ht(rate)) {
2688 lq_sta->optimal_rates = rs_optimal_rates_ht;
2689 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2693 /* Compute the optimal rate index based on RSSI */
2694 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2695 struct iwl_lq_sta *lq_sta)
2697 struct rs_rate *rate = &lq_sta->optimal_rate;
2700 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2703 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2704 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2706 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2707 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2708 rate->index = rate_idx;
2716 /* Choose an initial legacy rate and antenna to use based on the RSSI
2719 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2720 struct ieee80211_sta *sta,
2721 struct iwl_lq_sta *lq_sta,
2722 enum nl80211_band band,
2723 struct rs_rate *rate,
2727 unsigned long active_rate;
2728 s8 best_rssi = S8_MIN;
2729 u8 best_ant = ANT_NONE;
2730 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2731 const struct rs_init_rate_info *initial_rates;
2733 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2734 if (!(lq_sta->pers.chains & BIT(i)))
2737 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2738 best_rssi = lq_sta->pers.chain_signal[i];
2743 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2744 rs_pretty_ant(best_ant), best_rssi);
2746 if (best_ant != ANT_A && best_ant != ANT_B)
2747 rate->ant = first_antenna(valid_tx_ant);
2749 rate->ant = best_ant;
2753 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2755 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2758 if (band == NL80211_BAND_5GHZ) {
2759 rate->type = LQ_LEGACY_A;
2760 initial_rates = rs_optimal_rates_5ghz_legacy;
2761 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2763 rate->type = LQ_LEGACY_G;
2764 initial_rates = rs_optimal_rates_24ghz_legacy;
2765 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2768 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2771 /* Start from a higher rate if the corresponding debug capability
2772 * is enabled. The rate is chosen according to AP capabilities.
2773 * In case of VHT/HT when the rssi is low fallback to the case of
2776 if (sta->vht_cap.vht_supported &&
2777 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2779 * In AP mode, when a new station associates, rs is initialized
2780 * immediately upon association completion, before the phy
2781 * context is updated with the association parameters, so the
2782 * sta bandwidth might be wider than the phy context allows.
2783 * To avoid this issue, always initialize rs with 20mhz
2784 * bandwidth rate, and after authorization, when the phy context
2785 * is already up-to-date, re-init rs with the correct bw.
2787 u32 bw = init ? RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2790 case RATE_MCS_CHAN_WIDTH_40:
2791 case RATE_MCS_CHAN_WIDTH_80:
2792 case RATE_MCS_CHAN_WIDTH_160:
2793 initial_rates = rs_optimal_rates_vht;
2794 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2796 case RATE_MCS_CHAN_WIDTH_20:
2797 initial_rates = rs_optimal_rates_vht_20mhz;
2798 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2801 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2805 active_rate = lq_sta->active_siso_rate;
2806 rate->type = LQ_VHT_SISO;
2808 } else if (sta->ht_cap.ht_supported &&
2809 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2810 initial_rates = rs_optimal_rates_ht;
2811 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2812 active_rate = lq_sta->active_siso_rate;
2813 rate->type = LQ_HT_SISO;
2815 active_rate = lq_sta->active_legacy_rate;
2818 for (i = 0; i < nentries; i++) {
2819 int rate_idx = initial_rates[i].rate_idx;
2821 if ((best_rssi >= initial_rates[i].rssi) &&
2822 (BIT(rate_idx) & active_rate)) {
2823 rate->index = rate_idx;
2829 rs_dump_rate(mvm, rate, "INITIAL");
2832 /* Save info about RSSI of last Rx */
2833 void rs_update_last_rssi(struct iwl_mvm *mvm,
2834 struct iwl_lq_sta *lq_sta,
2835 struct ieee80211_rx_status *rx_status)
2839 lq_sta->pers.chains = rx_status->chains;
2840 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2841 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2842 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2843 lq_sta->pers.last_rssi = S8_MIN;
2845 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2846 if (!(lq_sta->pers.chains & BIT(i)))
2849 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2850 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2855 * rs_initialize_lq - Initialize a station's hardware rate table
2857 * The uCode's station table contains a table of fallback rates
2858 * for automatic fallback during transmission.
2860 * NOTE: This sets up a default set of values. These will be replaced later
2861 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2864 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2865 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2866 * which requires station table entry to exist).
2868 static void rs_initialize_lq(struct iwl_mvm *mvm,
2869 struct ieee80211_sta *sta,
2870 struct iwl_lq_sta *lq_sta,
2871 enum nl80211_band band,
2874 struct iwl_scale_tbl_info *tbl;
2875 struct rs_rate *rate;
2878 if (!sta || !lq_sta)
2881 if (!lq_sta->search_better_tbl)
2882 active_tbl = lq_sta->active_tbl;
2884 active_tbl = 1 - lq_sta->active_tbl;
2886 tbl = &(lq_sta->lq_info[active_tbl]);
2889 rs_get_initial_rate(mvm, sta, lq_sta, band, rate, init);
2890 rs_init_optimal_rate(mvm, sta, lq_sta);
2892 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2893 tbl->column = rs_get_column_from_rate(rate);
2895 rs_set_expected_tpt_table(lq_sta, tbl);
2896 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2897 /* TODO restore station should remember the lq cmd */
2898 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2901 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2902 struct ieee80211_tx_rate_control *txrc)
2904 struct sk_buff *skb = txrc->skb;
2905 struct iwl_op_mode *op_mode __maybe_unused =
2906 (struct iwl_op_mode *)mvm_r;
2907 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2908 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2909 struct iwl_lq_sta *lq_sta = mvm_sta;
2910 struct rs_rate *optimal_rate;
2911 u32 last_ucode_rate;
2913 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2914 /* if vif isn't initialized mvm doesn't know about
2915 * this station, so don't do anything with the it
2921 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2923 /* Treat uninitialized rate scaling data same as non-existing. */
2924 if (lq_sta && !lq_sta->pers.drv) {
2925 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2929 /* Send management frames and NO_ACK data using lowest rate. */
2930 if (rate_control_send_low(sta, mvm_sta, txrc))
2933 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2934 info->band, &info->control.rates[0]);
2935 info->control.rates[0].count = 1;
2937 /* Report the optimal rate based on rssi and STA caps if we haven't
2938 * converged yet (too little traffic) or exploring other modulations
2940 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2941 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2942 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2944 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2945 &txrc->reported_rate);
2949 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2952 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2953 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2954 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2955 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2957 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2959 lq_sta->pers.drv = mvm;
2960 #ifdef CONFIG_MAC80211_DEBUGFS
2961 lq_sta->pers.dbg_fixed_rate = 0;
2962 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2963 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2965 lq_sta->pers.chains = 0;
2966 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2967 lq_sta->pers.last_rssi = S8_MIN;
2969 return &sta_priv->lq_sta;
2972 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2975 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2976 (0x3 << (2 * (nss - 1)));
2977 rx_mcs >>= (2 * (nss - 1));
2979 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2980 return IWL_RATE_MCS_7_INDEX;
2981 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2982 return IWL_RATE_MCS_8_INDEX;
2983 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2984 return IWL_RATE_MCS_9_INDEX;
2986 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2990 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2991 struct ieee80211_sta_vht_cap *vht_cap,
2992 struct iwl_lq_sta *lq_sta)
2995 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2997 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2998 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2999 if (i == IWL_RATE_9M_INDEX)
3002 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3003 if (i == IWL_RATE_MCS_9_INDEX &&
3004 sta->bandwidth == IEEE80211_STA_RX_BW_20)
3007 lq_sta->active_siso_rate |= BIT(i);
3011 if (sta->rx_nss < 2)
3014 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
3015 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3016 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3017 if (i == IWL_RATE_9M_INDEX)
3020 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3021 if (i == IWL_RATE_MCS_9_INDEX &&
3022 sta->bandwidth == IEEE80211_STA_RX_BW_20)
3025 lq_sta->active_mimo2_rate |= BIT(i);
3030 static void rs_ht_init(struct iwl_mvm *mvm,
3031 struct ieee80211_sta *sta,
3032 struct iwl_lq_sta *lq_sta,
3033 struct ieee80211_sta_ht_cap *ht_cap)
3035 /* active_siso_rate mask includes 9 MBits (bit 5),
3036 * and CCK (bits 0-3), supp_rates[] does not;
3037 * shift to convert format, force 9 MBits off.
3039 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3040 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3041 lq_sta->active_siso_rate &= ~((u16)0x2);
3042 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3044 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3045 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3046 lq_sta->active_mimo2_rate &= ~((u16)0x2);
3047 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3049 if (mvm->cfg->ht_params->ldpc &&
3050 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3051 lq_sta->ldpc = true;
3053 if (mvm->cfg->ht_params->stbc &&
3054 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3055 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3056 lq_sta->stbc_capable = true;
3058 lq_sta->is_vht = false;
3061 static void rs_vht_init(struct iwl_mvm *mvm,
3062 struct ieee80211_sta *sta,
3063 struct iwl_lq_sta *lq_sta,
3064 struct ieee80211_sta_vht_cap *vht_cap)
3066 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3068 if (mvm->cfg->ht_params->ldpc &&
3069 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3070 lq_sta->ldpc = true;
3072 if (mvm->cfg->ht_params->stbc &&
3073 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3074 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3075 lq_sta->stbc_capable = true;
3077 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3078 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3079 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3080 lq_sta->bfer_capable = true;
3082 lq_sta->is_vht = true;
3085 #ifdef CONFIG_IWLWIFI_DEBUGFS
3086 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3088 spin_lock_bh(&mvm->drv_stats_lock);
3089 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3090 spin_unlock_bh(&mvm->drv_stats_lock);
3093 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3095 u8 nss = 0, mcs = 0;
3097 spin_lock(&mvm->drv_stats_lock);
3100 mvm->drv_rx_stats.agg_frames++;
3102 mvm->drv_rx_stats.success_frames++;
3104 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3105 case RATE_MCS_CHAN_WIDTH_20:
3106 mvm->drv_rx_stats.bw_20_frames++;
3108 case RATE_MCS_CHAN_WIDTH_40:
3109 mvm->drv_rx_stats.bw_40_frames++;
3111 case RATE_MCS_CHAN_WIDTH_80:
3112 mvm->drv_rx_stats.bw_80_frames++;
3114 case RATE_MCS_CHAN_WIDTH_160:
3115 mvm->drv_rx_stats.bw_160_frames++;
3118 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3121 if (rate & RATE_MCS_HT_MSK) {
3122 mvm->drv_rx_stats.ht_frames++;
3123 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
3124 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3125 } else if (rate & RATE_MCS_VHT_MSK) {
3126 mvm->drv_rx_stats.vht_frames++;
3127 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3128 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3129 RATE_VHT_MCS_NSS_POS) + 1;
3131 mvm->drv_rx_stats.legacy_frames++;
3135 mvm->drv_rx_stats.siso_frames++;
3137 mvm->drv_rx_stats.mimo2_frames++;
3139 if (rate & RATE_MCS_SGI_MSK)
3140 mvm->drv_rx_stats.sgi_frames++;
3142 mvm->drv_rx_stats.ngi_frames++;
3144 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3145 mvm->drv_rx_stats.last_frame_idx =
3146 (mvm->drv_rx_stats.last_frame_idx + 1) %
3147 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3149 spin_unlock(&mvm->drv_stats_lock);
3154 * Called after adding a new station to initialize rate scaling
3156 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3157 enum nl80211_band band, bool init)
3160 struct ieee80211_hw *hw = mvm->hw;
3161 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3162 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3163 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3164 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3165 struct ieee80211_supported_band *sband;
3166 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3168 /* clear all non-persistent lq data */
3169 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3171 sband = hw->wiphy->bands[band];
3173 lq_sta->lq.sta_id = sta_priv->sta_id;
3174 sta_priv->tlc_amsdu = false;
3176 for (j = 0; j < LQ_SIZE; j++)
3177 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3179 lq_sta->flush_timer = 0;
3180 lq_sta->last_tx = jiffies;
3183 "LQ: *** rate scale station global init for station %d ***\n",
3185 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3186 * the lowest or the highest rate.. Could consider using RSSI from
3187 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3190 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3191 lq_sta->band = sband->band;
3193 * active legacy rates as per supported rates bitmap
3195 supp = sta->supp_rates[sband->band];
3196 lq_sta->active_legacy_rate = 0;
3197 for_each_set_bit(i, &supp, BITS_PER_LONG)
3198 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3200 /* TODO: should probably account for rx_highest for both HT/VHT */
3201 if (!vht_cap || !vht_cap->vht_supported)
3202 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3204 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3206 lq_sta->max_legacy_rate_idx =
3207 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3208 lq_sta->max_siso_rate_idx =
3209 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3210 lq_sta->max_mimo2_rate_idx =
3211 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3214 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3215 lq_sta->active_legacy_rate,
3216 lq_sta->active_siso_rate,
3217 lq_sta->active_mimo2_rate,
3218 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3219 lq_sta->bfer_capable);
3220 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3221 lq_sta->max_legacy_rate_idx,
3222 lq_sta->max_siso_rate_idx,
3223 lq_sta->max_mimo2_rate_idx);
3225 /* These values will be overridden later */
3226 lq_sta->lq.single_stream_ant_msk =
3227 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3228 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3230 /* as default allow aggregation for all tids */
3231 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3233 #ifdef CONFIG_IWLWIFI_DEBUGFS
3234 iwl_mvm_reset_frame_stats(mvm);
3236 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3239 static void rs_rate_update(void *mvm_r,
3240 struct ieee80211_supported_band *sband,
3241 struct cfg80211_chan_def *chandef,
3242 struct ieee80211_sta *sta, void *priv_sta,
3246 struct iwl_op_mode *op_mode =
3247 (struct iwl_op_mode *)mvm_r;
3248 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3250 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3253 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3254 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3255 ieee80211_stop_tx_ba_session(sta, tid);
3257 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3260 #ifdef CONFIG_MAC80211_DEBUGFS
3261 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3262 struct iwl_lq_cmd *lq_cmd,
3263 enum nl80211_band band,
3266 struct rs_rate rate;
3268 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3269 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3270 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3272 for (i = 0; i < num_rates; i++)
3273 lq_cmd->rs_table[i] = ucode_rate_le32;
3275 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3281 lq_cmd->mimo_delim = num_rates - 1;
3283 lq_cmd->mimo_delim = 0;
3285 lq_cmd->reduced_tpc = 0;
3287 if (num_of_ant(ant) == 1)
3288 lq_cmd->single_stream_ant_msk = ant;
3290 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3292 #endif /* CONFIG_MAC80211_DEBUGFS */
3294 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3295 struct iwl_lq_sta *lq_sta,
3296 struct rs_rate *rate,
3297 __le32 *rs_table, int *rs_table_index,
3298 int num_rates, int num_retries,
3299 u8 valid_tx_ant, bool toggle_ant)
3303 bool bottom_reached = false;
3304 int prev_rate_idx = rate->index;
3305 int end = LINK_QUAL_MAX_RETRY_NUM;
3306 int index = *rs_table_index;
3308 for (i = 0; i < num_rates && index < end; i++) {
3309 for (j = 0; j < num_retries && index < end; j++, index++) {
3310 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3312 rs_table[index] = ucode_rate;
3314 rs_toggle_antenna(valid_tx_ant, rate);
3317 prev_rate_idx = rate->index;
3318 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3319 if (bottom_reached && !is_legacy(rate))
3323 if (!bottom_reached && !is_legacy(rate))
3324 rate->index = prev_rate_idx;
3326 *rs_table_index = index;
3329 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3330 * column the rate table should look like this:
3332 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3333 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3334 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3335 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3336 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3337 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3338 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3339 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3340 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3341 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3342 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3343 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3344 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3345 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3346 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3347 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3349 static void rs_build_rates_table(struct iwl_mvm *mvm,
3350 struct ieee80211_sta *sta,
3351 struct iwl_lq_sta *lq_sta,
3352 const struct rs_rate *initial_rate)
3354 struct rs_rate rate;
3355 int num_rates, num_retries, index = 0;
3356 u8 valid_tx_ant = 0;
3357 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3358 bool toggle_ant = false;
3360 memcpy(&rate, initial_rate, sizeof(rate));
3362 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3364 /* TODO: remove old API when min FW API hits 14 */
3365 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3366 rs_stbc_allow(mvm, sta, lq_sta))
3369 if (is_siso(&rate)) {
3370 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3371 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3372 } else if (is_mimo(&rate)) {
3373 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3374 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3376 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3377 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3381 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3382 num_rates, num_retries, valid_tx_ant,
3385 rs_get_lower_rate_down_column(lq_sta, &rate);
3387 if (is_siso(&rate)) {
3388 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3389 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3390 lq_cmd->mimo_delim = index;
3391 } else if (is_legacy(&rate)) {
3392 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3393 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3400 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3401 num_rates, num_retries, valid_tx_ant,
3404 rs_get_lower_rate_down_column(lq_sta, &rate);
3406 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3407 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3409 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3410 num_rates, num_retries, valid_tx_ant,
3415 struct rs_bfer_active_iter_data {
3416 struct ieee80211_sta *exclude_sta;
3417 struct iwl_mvm_sta *bfer_mvmsta;
3420 static void rs_bfer_active_iter(void *_data,
3421 struct ieee80211_sta *sta)
3423 struct rs_bfer_active_iter_data *data = _data;
3424 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3425 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3426 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3428 if (sta == data->exclude_sta)
3431 /* The current sta has BFER allowed */
3432 if (ss_params & LQ_SS_BFER_ALLOWED) {
3433 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3435 data->bfer_mvmsta = mvmsta;
3439 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3442 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3445 case NL80211_IFTYPE_AP:
3446 case NL80211_IFTYPE_P2P_GO:
3449 case NL80211_IFTYPE_P2P_CLIENT:
3452 case NL80211_IFTYPE_STATION:
3456 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3463 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3464 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3465 struct iwl_mvm_sta *sta2)
3467 int prio1 = rs_bfer_priority(sta1);
3468 int prio2 = rs_bfer_priority(sta2);
3477 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3478 struct ieee80211_sta *sta,
3479 struct iwl_lq_sta *lq_sta,
3480 const struct rs_rate *initial_rate)
3482 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3483 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3484 struct rs_bfer_active_iter_data data = {
3486 .bfer_mvmsta = NULL,
3488 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3489 u32 ss_params = LQ_SS_PARAMS_VALID;
3491 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3494 #ifdef CONFIG_MAC80211_DEBUGFS
3495 /* Check if forcing the decision is configured.
3496 * Note that SISO is forced by not allowing STBC or BFER
3498 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3499 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3500 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3501 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3503 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3504 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3505 lq_sta->pers.ss_force);
3510 if (lq_sta->stbc_capable)
3511 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3513 if (!lq_sta->bfer_capable)
3516 ieee80211_iterate_stations_atomic(mvm->hw,
3517 rs_bfer_active_iter,
3519 bfer_mvmsta = data.bfer_mvmsta;
3521 /* This code is safe as it doesn't run concurrently for different
3522 * stations. This is guaranteed by the fact that calls to
3523 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3526 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3528 ss_params |= LQ_SS_BFER_ALLOWED;
3532 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3533 bfer_mvmsta->sta_id);
3535 /* Disallow BFER on another STA if active and we're a higher priority */
3536 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3537 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3538 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3540 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3541 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3542 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3544 ss_params |= LQ_SS_BFER_ALLOWED;
3546 "Lower priority BFER sta found (%d). Switch BFER\n",
3547 bfer_mvmsta->sta_id);
3550 lq_cmd->ss_params = cpu_to_le32(ss_params);
3553 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3554 struct ieee80211_sta *sta,
3555 struct iwl_lq_sta *lq_sta,
3556 const struct rs_rate *initial_rate)
3558 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3559 struct iwl_mvm_sta *mvmsta;
3560 struct iwl_mvm_vif *mvmvif;
3562 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3563 lq_cmd->agg_time_limit =
3564 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3566 #ifdef CONFIG_MAC80211_DEBUGFS
3567 if (lq_sta->pers.dbg_fixed_rate) {
3568 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3570 lq_sta->pers.dbg_fixed_rate);
3574 if (WARN_ON_ONCE(!sta || !initial_rate))
3577 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3579 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3580 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3582 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3583 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3585 if (num_of_ant(initial_rate->ant) == 1)
3586 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3588 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3591 * In case of low latency, tell the firmware to leave a frame in the
3592 * Tx Fifo so that it can start a transaction in the same TxOP. This
3593 * basically allows the firmware to send bursts.
3595 if (iwl_mvm_vif_low_latency(mvmvif))
3596 lq_cmd->agg_frame_cnt_limit--;
3598 if (mvmsta->vif->p2p)
3599 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3601 lq_cmd->agg_time_limit =
3602 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3605 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3609 /* rate scale requires free function to be implemented */
3610 static void rs_free(void *mvm_rate)
3615 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3618 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3619 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3621 IWL_DEBUG_RATE(mvm, "enter\n");
3622 IWL_DEBUG_RATE(mvm, "leave\n");
3625 #ifdef CONFIG_MAC80211_DEBUGFS
3626 int rs_pretty_print_rate(char *buf, const u32 rate)
3630 u8 mcs = 0, nss = 0;
3631 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3633 if (!(rate & RATE_MCS_HT_MSK) &&
3634 !(rate & RATE_MCS_VHT_MSK)) {
3635 int index = iwl_hwrate_to_plcp_idx(rate);
3637 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3639 index == IWL_RATE_INVALID ? "BAD" :
3640 iwl_rate_mcs[index].mbps);
3643 if (rate & RATE_MCS_VHT_MSK) {
3645 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3646 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3647 >> RATE_VHT_MCS_NSS_POS) + 1;
3648 } else if (rate & RATE_MCS_HT_MSK) {
3650 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3652 type = "Unknown"; /* shouldn't happen */
3655 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3656 case RATE_MCS_CHAN_WIDTH_20:
3659 case RATE_MCS_CHAN_WIDTH_40:
3662 case RATE_MCS_CHAN_WIDTH_80:
3665 case RATE_MCS_CHAN_WIDTH_160:
3672 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3673 type, rs_pretty_ant(ant), bw, mcs, nss,
3674 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3675 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3676 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3677 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3678 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3682 * Program the device to use fixed rate for frame transmit
3683 * This is for debugging/testing only
3684 * once the device start use fixed rate, we need to reload the module
3685 * to being back the normal operation.
3687 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3688 struct iwl_lq_sta *lq_sta)
3690 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3691 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3692 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3694 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3695 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3697 if (lq_sta->pers.dbg_fixed_rate) {
3698 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3699 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3703 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3704 const char __user *user_buf, size_t count, loff_t *ppos)
3706 struct iwl_lq_sta *lq_sta = file->private_data;
3707 struct iwl_mvm *mvm;
3712 mvm = lq_sta->pers.drv;
3713 memset(buf, 0, sizeof(buf));
3714 buf_size = min(count, sizeof(buf) - 1);
3715 if (copy_from_user(buf, user_buf, buf_size))
3718 if (sscanf(buf, "%x", &parsed_rate) == 1)
3719 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3721 lq_sta->pers.dbg_fixed_rate = 0;
3723 rs_program_fix_rate(mvm, lq_sta);
3728 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3729 char __user *user_buf, size_t count, loff_t *ppos)
3736 struct iwl_lq_sta *lq_sta = file->private_data;
3737 struct iwl_mvm_sta *mvmsta =
3738 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3739 struct iwl_mvm *mvm;
3740 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3741 struct rs_rate *rate = &tbl->rate;
3744 mvm = lq_sta->pers.drv;
3745 buff = kmalloc(2048, GFP_KERNEL);
3749 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3750 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3751 lq_sta->total_failed, lq_sta->total_success,
3752 lq_sta->active_legacy_rate);
3753 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3754 lq_sta->pers.dbg_fixed_rate);
3755 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3756 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3757 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3758 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3759 desc += sprintf(buff+desc, "lq type %s\n",
3760 (is_legacy(rate)) ? "legacy" :
3761 is_vht(rate) ? "VHT" : "HT");
3762 if (!is_legacy(rate)) {
3763 desc += sprintf(buff + desc, " %s",
3764 (is_siso(rate)) ? "SISO" : "MIMO2");
3765 desc += sprintf(buff + desc, " %s",
3766 (is_ht20(rate)) ? "20MHz" :
3767 (is_ht40(rate)) ? "40MHz" :
3768 (is_ht80(rate)) ? "80MHz" :
3769 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3770 desc += sprintf(buff + desc, " %s %s %s %s\n",
3771 (rate->sgi) ? "SGI" : "NGI",
3772 (rate->ldpc) ? "LDPC" : "BCC",
3773 (lq_sta->is_agg) ? "AGG on" : "",
3774 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3776 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3777 lq_sta->last_rate_n_flags);
3778 desc += sprintf(buff+desc,
3779 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3781 lq_sta->lq.mimo_delim,
3782 lq_sta->lq.single_stream_ant_msk,
3783 lq_sta->lq.dual_stream_ant_msk);
3785 desc += sprintf(buff+desc,
3786 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3787 le16_to_cpu(lq_sta->lq.agg_time_limit),
3788 lq_sta->lq.agg_disable_start_th,
3789 lq_sta->lq.agg_frame_cnt_limit);
3791 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3792 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3793 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3794 (ss_params & LQ_SS_PARAMS_VALID) ?
3795 "VALID" : "INVALID",
3796 (ss_params & LQ_SS_BFER_ALLOWED) ?
3798 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3800 (ss_params & LQ_SS_FORCE) ?
3802 desc += sprintf(buff+desc,
3803 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3804 lq_sta->lq.initial_rate_index[0],
3805 lq_sta->lq.initial_rate_index[1],
3806 lq_sta->lq.initial_rate_index[2],
3807 lq_sta->lq.initial_rate_index[3]);
3809 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3810 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3812 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3813 desc += rs_pretty_print_rate(buff+desc, r);
3816 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3821 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3822 .write = rs_sta_dbgfs_scale_table_write,
3823 .read = rs_sta_dbgfs_scale_table_read,
3824 .open = simple_open,
3825 .llseek = default_llseek,
3827 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3828 char __user *user_buf, size_t count, loff_t *ppos)
3834 struct iwl_scale_tbl_info *tbl;
3835 struct rs_rate *rate;
3836 struct iwl_lq_sta *lq_sta = file->private_data;
3838 buff = kmalloc(1024, GFP_KERNEL);
3842 for (i = 0; i < LQ_SIZE; i++) {
3843 tbl = &(lq_sta->lq_info[i]);
3845 desc += sprintf(buff+desc,
3846 "%s type=%d SGI=%d BW=%s DUP=0\n"
3848 lq_sta->active_tbl == i ? "*" : "x",
3851 is_ht20(rate) ? "20MHz" :
3852 is_ht40(rate) ? "40MHz" :
3853 is_ht80(rate) ? "80MHz" :
3854 is_ht160(rate) ? "160MHz" : "ERR",
3856 for (j = 0; j < IWL_RATE_COUNT; j++) {
3857 desc += sprintf(buff+desc,
3858 "counter=%d success=%d %%=%d\n",
3859 tbl->win[j].counter,
3860 tbl->win[j].success_counter,
3861 tbl->win[j].success_ratio);
3864 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3869 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3870 .read = rs_sta_dbgfs_stats_table_read,
3871 .open = simple_open,
3872 .llseek = default_llseek,
3875 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3876 char __user *user_buf,
3877 size_t count, loff_t *ppos)
3879 static const char * const column_name[] = {
3880 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3881 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3882 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3883 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3884 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3885 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3886 [RS_COLUMN_MIMO2] = "MIMO2",
3887 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3890 static const char * const rate_name[] = {
3891 [IWL_RATE_1M_INDEX] = "1M",
3892 [IWL_RATE_2M_INDEX] = "2M",
3893 [IWL_RATE_5M_INDEX] = "5.5M",
3894 [IWL_RATE_11M_INDEX] = "11M",
3895 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3896 [IWL_RATE_9M_INDEX] = "9M",
3897 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3898 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3899 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3900 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3901 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3902 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3903 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3904 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3905 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3908 char *buff, *pos, *endpos;
3911 struct iwl_lq_sta *lq_sta = file->private_data;
3912 struct rs_rate_stats *stats;
3913 static const size_t bufsz = 1024;
3915 buff = kmalloc(bufsz, GFP_KERNEL);
3920 endpos = pos + bufsz;
3922 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3923 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3924 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3925 pos += scnprintf(pos, endpos - pos, "\n");
3927 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3928 pos += scnprintf(pos, endpos - pos,
3929 "%s,", column_name[col]);
3931 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3932 stats = &(lq_sta->pers.tx_stats[col][rate]);
3933 pos += scnprintf(pos, endpos - pos,
3938 pos += scnprintf(pos, endpos - pos, "\n");
3941 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3946 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3947 const char __user *user_buf,
3948 size_t count, loff_t *ppos)
3950 struct iwl_lq_sta *lq_sta = file->private_data;
3951 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3956 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3957 .read = rs_sta_dbgfs_drv_tx_stats_read,
3958 .write = rs_sta_dbgfs_drv_tx_stats_write,
3959 .open = simple_open,
3960 .llseek = default_llseek,
3963 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3964 char __user *user_buf,
3965 size_t count, loff_t *ppos)
3967 struct iwl_lq_sta *lq_sta = file->private_data;
3969 int bufsz = sizeof(buf);
3971 static const char * const ss_force_name[] = {
3972 [RS_SS_FORCE_NONE] = "none",
3973 [RS_SS_FORCE_STBC] = "stbc",
3974 [RS_SS_FORCE_BFER] = "bfer",
3975 [RS_SS_FORCE_SISO] = "siso",
3978 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3979 ss_force_name[lq_sta->pers.ss_force]);
3980 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3983 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3984 size_t count, loff_t *ppos)
3986 struct iwl_mvm *mvm = lq_sta->pers.drv;
3989 if (!strncmp("none", buf, 4)) {
3990 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3991 } else if (!strncmp("siso", buf, 4)) {
3992 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3993 } else if (!strncmp("stbc", buf, 4)) {
3994 if (lq_sta->stbc_capable) {
3995 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3998 "can't force STBC. peer doesn't support\n");
4001 } else if (!strncmp("bfer", buf, 4)) {
4002 if (lq_sta->bfer_capable) {
4003 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4006 "can't force BFER. peer doesn't support\n");
4010 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4013 return ret ?: count;
4016 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4017 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4018 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
4019 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
4020 &iwl_dbgfs_##name##_ops)) \
4024 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4026 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
4028 struct iwl_lq_sta *lq_sta = priv_sta;
4029 struct iwl_mvm_sta *mvmsta;
4031 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
4036 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
4037 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4038 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
4039 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4040 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
4041 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4042 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
4043 &lq_sta->tx_agg_tid_en);
4044 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4045 &lq_sta->pers.dbg_fixed_txp_reduction);
4047 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4050 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4053 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4059 * Initialization of rate scaling information is done by driver after
4060 * the station is added. Since mac80211 calls this function before a
4061 * station is added we ignore it.
4063 static void rs_rate_init_stub(void *mvm_r,
4064 struct ieee80211_supported_band *sband,
4065 struct cfg80211_chan_def *chandef,
4066 struct ieee80211_sta *sta, void *mvm_sta)
4070 static const struct rate_control_ops rs_mvm_ops = {
4072 .tx_status = rs_mac80211_tx_status,
4073 .get_rate = rs_get_rate,
4074 .rate_init = rs_rate_init_stub,
4077 .alloc_sta = rs_alloc_sta,
4078 .free_sta = rs_free_sta,
4079 .rate_update = rs_rate_update,
4080 #ifdef CONFIG_MAC80211_DEBUGFS
4081 .add_sta_debugfs = rs_add_debugfs,
4082 .remove_sta_debugfs = rs_remove_debugfs,
4086 int iwl_mvm_rate_control_register(void)
4088 return ieee80211_rate_control_register(&rs_mvm_ops);
4091 void iwl_mvm_rate_control_unregister(void)
4093 ieee80211_rate_control_unregister(&rs_mvm_ops);
4097 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4098 * Tx protection, according to this request and previous requests,
4099 * and send the LQ command.
4100 * @mvmsta: The station
4101 * @enable: Enable Tx protection?
4103 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4106 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4108 lockdep_assert_held(&mvm->mutex);
4111 if (mvmsta->tx_protection == 0)
4112 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4113 mvmsta->tx_protection++;
4115 mvmsta->tx_protection--;
4116 if (mvmsta->tx_protection == 0)
4117 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4120 return iwl_mvm_send_lq_cmd(mvm, lq, false);