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 if (!sta->ht_cap.ht_supported)
167 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
170 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
173 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
176 if (mvm->nvm_data->sku_cap_mimo_disabled)
182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
183 struct rs_rate *rate,
184 const struct rs_tx_column *next_col)
186 if (!sta->ht_cap.ht_supported)
192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
193 struct rs_rate *rate,
194 const struct rs_tx_column *next_col)
196 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
197 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
199 if (is_ht20(rate) && (ht_cap->cap &
200 IEEE80211_HT_CAP_SGI_20))
202 if (is_ht40(rate) && (ht_cap->cap &
203 IEEE80211_HT_CAP_SGI_40))
205 if (is_ht80(rate) && (vht_cap->cap &
206 IEEE80211_VHT_CAP_SHORT_GI_80))
208 if (is_ht160(rate) && (vht_cap->cap &
209 IEEE80211_VHT_CAP_SHORT_GI_160))
215 static const struct rs_tx_column rs_tx_columns[] = {
216 [RS_COLUMN_LEGACY_ANT_A] = {
220 RS_COLUMN_LEGACY_ANT_B,
221 RS_COLUMN_SISO_ANT_A,
232 [RS_COLUMN_LEGACY_ANT_B] = {
236 RS_COLUMN_LEGACY_ANT_A,
237 RS_COLUMN_SISO_ANT_B,
248 [RS_COLUMN_SISO_ANT_A] = {
252 RS_COLUMN_SISO_ANT_B,
254 RS_COLUMN_SISO_ANT_A_SGI,
255 RS_COLUMN_LEGACY_ANT_A,
256 RS_COLUMN_LEGACY_ANT_B,
265 [RS_COLUMN_SISO_ANT_B] = {
269 RS_COLUMN_SISO_ANT_A,
271 RS_COLUMN_SISO_ANT_B_SGI,
272 RS_COLUMN_LEGACY_ANT_A,
273 RS_COLUMN_LEGACY_ANT_B,
282 [RS_COLUMN_SISO_ANT_A_SGI] = {
287 RS_COLUMN_SISO_ANT_B_SGI,
289 RS_COLUMN_SISO_ANT_A,
290 RS_COLUMN_LEGACY_ANT_A,
291 RS_COLUMN_LEGACY_ANT_B,
301 [RS_COLUMN_SISO_ANT_B_SGI] = {
306 RS_COLUMN_SISO_ANT_A_SGI,
308 RS_COLUMN_SISO_ANT_B,
309 RS_COLUMN_LEGACY_ANT_A,
310 RS_COLUMN_LEGACY_ANT_B,
320 [RS_COLUMN_MIMO2] = {
324 RS_COLUMN_SISO_ANT_A,
326 RS_COLUMN_LEGACY_ANT_A,
327 RS_COLUMN_LEGACY_ANT_B,
336 [RS_COLUMN_MIMO2_SGI] = {
341 RS_COLUMN_SISO_ANT_A_SGI,
343 RS_COLUMN_LEGACY_ANT_A,
344 RS_COLUMN_LEGACY_ANT_B,
356 static inline u8 rs_extract_rate(u32 rate_n_flags)
358 /* also works for HT because bits 7:6 are zero there */
359 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
366 if (rate_n_flags & RATE_MCS_HT_MSK) {
367 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
368 idx += IWL_RATE_MCS_0_INDEX;
370 /* skip 9M not supported in HT*/
371 if (idx >= IWL_RATE_9M_INDEX)
373 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
375 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
376 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
377 idx += IWL_RATE_MCS_0_INDEX;
379 /* skip 9M not supported in VHT*/
380 if (idx >= IWL_RATE_9M_INDEX)
382 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
385 /* legacy rate format, search for match in table */
387 u8 legacy_rate = rs_extract_rate(rate_n_flags);
388 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
389 if (iwl_rates[idx].plcp == legacy_rate)
393 return IWL_RATE_INVALID;
396 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
397 struct ieee80211_sta *sta,
398 struct iwl_lq_sta *lq_sta,
400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
401 struct ieee80211_sta *sta,
402 struct iwl_lq_sta *lq_sta,
403 const struct rs_rate *initial_rate);
404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
407 * The following tables contain the expected throughput metrics for all rates
409 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
411 * where invalid entries are zeros.
413 * CCK rates are only valid in legacy table and will only be used in G
417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
418 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
421 /* Expected TpT tables. 4 indexes:
422 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
425 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
426 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
427 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
428 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
432 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
433 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
434 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
435 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
439 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
440 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
441 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
442 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
446 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330},
447 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334},
448 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
449 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
453 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
454 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
455 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
456 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
460 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
461 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
462 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
463 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
467 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
468 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
469 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
470 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
474 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334},
475 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338},
476 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592},
477 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
490 { "24", "16QAM 1/2"},
491 { "36", "16QAM 3/4"},
492 { "48", "64QAM 2/3"},
493 { "54", "64QAM 3/4"},
494 { "60", "64QAM 5/6"},
497 #define MCS_INDEX_PER_STREAM (8)
499 static const char *rs_pretty_ant(u8 ant)
501 static const char * const ant_name[] = {
515 return ant_name[ant];
518 static const char *rs_pretty_lq_type(enum iwl_table_type type)
520 static const char * const lq_types[] = {
522 [LQ_LEGACY_A] = "LEGACY_A",
523 [LQ_LEGACY_G] = "LEGACY_G",
524 [LQ_HT_SISO] = "HT SISO",
525 [LQ_HT_MIMO2] = "HT MIMO",
526 [LQ_VHT_SISO] = "VHT SISO",
527 [LQ_VHT_MIMO2] = "VHT MIMO",
530 if (type < LQ_NONE || type >= LQ_MAX)
533 return lq_types[type];
536 static char *rs_pretty_rate(const struct rs_rate *rate)
539 static const char * const legacy_rates[] = {
540 [IWL_RATE_1M_INDEX] = "1M",
541 [IWL_RATE_2M_INDEX] = "2M",
542 [IWL_RATE_5M_INDEX] = "5.5M",
543 [IWL_RATE_11M_INDEX] = "11M",
544 [IWL_RATE_6M_INDEX] = "6M",
545 [IWL_RATE_9M_INDEX] = "9M",
546 [IWL_RATE_12M_INDEX] = "12M",
547 [IWL_RATE_18M_INDEX] = "18M",
548 [IWL_RATE_24M_INDEX] = "24M",
549 [IWL_RATE_36M_INDEX] = "36M",
550 [IWL_RATE_48M_INDEX] = "48M",
551 [IWL_RATE_54M_INDEX] = "54M",
553 static const char *const ht_vht_rates[] = {
554 [IWL_RATE_MCS_0_INDEX] = "MCS0",
555 [IWL_RATE_MCS_1_INDEX] = "MCS1",
556 [IWL_RATE_MCS_2_INDEX] = "MCS2",
557 [IWL_RATE_MCS_3_INDEX] = "MCS3",
558 [IWL_RATE_MCS_4_INDEX] = "MCS4",
559 [IWL_RATE_MCS_5_INDEX] = "MCS5",
560 [IWL_RATE_MCS_6_INDEX] = "MCS6",
561 [IWL_RATE_MCS_7_INDEX] = "MCS7",
562 [IWL_RATE_MCS_8_INDEX] = "MCS8",
563 [IWL_RATE_MCS_9_INDEX] = "MCS9",
565 const char *rate_str;
567 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
568 rate_str = legacy_rates[rate->index];
569 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
570 (rate->index >= IWL_RATE_MCS_0_INDEX) &&
571 (rate->index <= IWL_RATE_MCS_9_INDEX))
572 rate_str = ht_vht_rates[rate->index];
574 rate_str = "BAD_RATE";
576 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
577 rs_pretty_ant(rate->ant), rate_str);
581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
585 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
586 prefix, rs_pretty_rate(rate), rate->bw,
587 rate->sgi, rate->ldpc, rate->stbc);
590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
593 window->success_counter = 0;
594 window->success_ratio = IWL_INVALID_VALUE;
596 window->average_tpt = IWL_INVALID_VALUE;
599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
600 struct iwl_scale_tbl_info *tbl)
604 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
605 for (i = 0; i < IWL_RATE_COUNT; i++)
606 rs_rate_scale_clear_window(&tbl->win[i]);
608 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
609 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
614 return (ant_type & valid_antenna) == ant_type;
617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
618 struct iwl_lq_sta *lq_data, u8 tid,
619 struct ieee80211_sta *sta)
623 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
625 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
626 if (ret == -EAGAIN) {
628 * driver and mac80211 is out of sync
629 * this might be cause by reloading firmware
630 * stop the tx ba session here
632 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
634 ieee80211_stop_tx_ba_session(sta, tid);
639 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
640 struct iwl_lq_sta *lq_data,
641 struct ieee80211_sta *sta)
643 if (tid < IWL_MAX_TID_COUNT)
644 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
646 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
647 tid, IWL_MAX_TID_COUNT);
650 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
652 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
653 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
654 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
658 * Static function to get the expected throughput from an iwl_scale_tbl_info
659 * that wraps a NULL pointer check
661 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
663 if (tbl->expected_tpt)
664 return tbl->expected_tpt[rs_index];
669 * rs_collect_tx_data - Update the success/failure sliding window
671 * We keep a sliding window of the last 62 packets transmitted
672 * at this rate. window->data contains the bitmask of successful
675 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
676 struct iwl_scale_tbl_info *tbl,
677 int scale_index, int attempts, int successes,
678 struct iwl_rate_scale_data *window)
680 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
683 /* Get expected throughput */
684 tpt = get_expected_tpt(tbl, scale_index);
687 * Keep track of only the latest 62 tx frame attempts in this rate's
688 * history window; anything older isn't really relevant any more.
689 * If we have filled up the sliding window, drop the oldest attempt;
690 * if the oldest attempt (highest bit in bitmap) shows "success",
691 * subtract "1" from the success counter (this is the main reason
692 * we keep these bitmaps!).
694 while (attempts > 0) {
695 if (window->counter >= IWL_RATE_MAX_WINDOW) {
696 /* remove earliest */
697 window->counter = IWL_RATE_MAX_WINDOW - 1;
699 if (window->data & mask) {
700 window->data &= ~mask;
701 window->success_counter--;
705 /* Increment frames-attempted counter */
708 /* Shift bitmap by one frame to throw away oldest history */
711 /* Mark the most recent #successes attempts as successful */
713 window->success_counter++;
721 /* Calculate current success ratio, avoid divide-by-0! */
722 if (window->counter > 0)
723 window->success_ratio = 128 * (100 * window->success_counter)
726 window->success_ratio = IWL_INVALID_VALUE;
728 fail_count = window->counter - window->success_counter;
730 /* Calculate average throughput, if we have enough history. */
731 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
732 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
733 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
735 window->average_tpt = IWL_INVALID_VALUE;
740 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
741 struct iwl_lq_sta *lq_sta,
742 struct iwl_scale_tbl_info *tbl,
743 int scale_index, int attempts, int successes,
746 struct iwl_rate_scale_data *window = NULL;
748 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
751 window = &tbl->tpc_win[reduced_txp];
752 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
756 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
757 struct iwl_lq_sta *lq_sta,
758 struct iwl_scale_tbl_info *tbl,
759 int scale_index, int attempts, int successes)
761 struct iwl_rate_scale_data *window = NULL;
763 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
766 if (tbl->column != RS_COLUMN_INVALID) {
767 struct lq_sta_pers *pers = &lq_sta->pers;
769 pers->tx_stats[tbl->column][scale_index].total += attempts;
770 pers->tx_stats[tbl->column][scale_index].success += successes;
773 /* Select window for current tx bit rate */
774 window = &(tbl->win[scale_index]);
775 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
779 /* Convert rs_rate object into ucode rate bitmask */
780 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
781 struct rs_rate *rate)
784 int index = rate->index;
786 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
787 RATE_MCS_ANT_ABC_MSK);
789 if (is_legacy(rate)) {
790 ucode_rate |= iwl_rates[index].plcp;
791 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
792 ucode_rate |= RATE_MCS_CCK_MSK;
797 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
798 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
799 index = IWL_LAST_HT_RATE;
801 ucode_rate |= RATE_MCS_HT_MSK;
803 if (is_ht_siso(rate))
804 ucode_rate |= iwl_rates[index].plcp_ht_siso;
805 else if (is_ht_mimo2(rate))
806 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
809 } else if (is_vht(rate)) {
810 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
811 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
812 index = IWL_LAST_VHT_RATE;
814 ucode_rate |= RATE_MCS_VHT_MSK;
815 if (is_vht_siso(rate))
816 ucode_rate |= iwl_rates[index].plcp_vht_siso;
817 else if (is_vht_mimo2(rate))
818 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
823 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
826 if (is_siso(rate) && rate->stbc) {
827 /* To enable STBC we need to set both a flag and ANT_AB */
828 ucode_rate |= RATE_MCS_ANT_AB_MSK;
829 ucode_rate |= RATE_MCS_STBC_MSK;
832 ucode_rate |= rate->bw;
834 ucode_rate |= RATE_MCS_SGI_MSK;
836 ucode_rate |= RATE_MCS_LDPC_MSK;
841 /* Convert a ucode rate into an rs_rate object */
842 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
843 enum nl80211_band band,
844 struct rs_rate *rate)
846 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
847 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
850 memset(rate, 0, sizeof(*rate));
851 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
853 if (rate->index == IWL_RATE_INVALID)
856 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
859 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
860 !(ucode_rate & RATE_MCS_VHT_MSK)) {
861 if (num_of_ant == 1) {
862 if (band == NL80211_BAND_5GHZ)
863 rate->type = LQ_LEGACY_A;
865 rate->type = LQ_LEGACY_G;
872 if (ucode_rate & RATE_MCS_SGI_MSK)
874 if (ucode_rate & RATE_MCS_LDPC_MSK)
876 if (ucode_rate & RATE_MCS_STBC_MSK)
878 if (ucode_rate & RATE_MCS_BF_MSK)
881 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
883 if (ucode_rate & RATE_MCS_HT_MSK) {
884 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
885 RATE_HT_MCS_NSS_POS) + 1;
888 rate->type = LQ_HT_SISO;
889 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
891 rate->stbc, rate->bfer);
892 } else if (nss == 2) {
893 rate->type = LQ_HT_MIMO2;
894 WARN_ON_ONCE(num_of_ant != 2);
898 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
899 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
900 RATE_VHT_MCS_NSS_POS) + 1;
903 rate->type = LQ_VHT_SISO;
904 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
906 rate->stbc, rate->bfer);
907 } else if (nss == 2) {
908 rate->type = LQ_VHT_MIMO2;
909 WARN_ON_ONCE(num_of_ant != 2);
915 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
921 /* switch to another antenna/antennas and return 1 */
922 /* if no other valid antenna found, return 0 */
923 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
927 if (!rate->ant || rate->ant > ANT_ABC)
930 if (!rs_is_valid_ant(valid_ant, rate->ant))
933 new_ant_type = ant_toggle_lookup[rate->ant];
935 while ((new_ant_type != rate->ant) &&
936 !rs_is_valid_ant(valid_ant, new_ant_type))
937 new_ant_type = ant_toggle_lookup[new_ant_type];
939 if (new_ant_type == rate->ant)
942 rate->ant = new_ant_type;
947 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
948 struct rs_rate *rate)
951 return lq_sta->active_legacy_rate;
952 else if (is_siso(rate))
953 return lq_sta->active_siso_rate;
954 else if (is_mimo2(rate))
955 return lq_sta->active_mimo2_rate;
961 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
964 u8 high = IWL_RATE_INVALID;
965 u8 low = IWL_RATE_INVALID;
967 /* 802.11A or ht walks to the next literal adjacent rate in
969 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
973 /* Find the previous rate that is in the rate mask */
977 for (; i >= 0; i--, mask >>= 1) {
978 if (rate_mask & mask) {
984 /* Find the next rate that is in the rate mask */
986 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
987 if (rate_mask & mask) {
993 return (high << 8) | low;
997 while (low != IWL_RATE_INVALID) {
998 low = iwl_rates[low].prev_rs;
999 if (low == IWL_RATE_INVALID)
1001 if (rate_mask & (1 << low))
1006 while (high != IWL_RATE_INVALID) {
1007 high = iwl_rates[high].next_rs;
1008 if (high == IWL_RATE_INVALID)
1010 if (rate_mask & (1 << high))
1014 return (high << 8) | low;
1017 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1018 struct rs_rate *rate)
1020 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1023 /* Get the next supported lower rate in the current column.
1024 * Return true if bottom rate in the current column was reached
1026 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1027 struct rs_rate *rate)
1032 struct iwl_mvm *mvm = lq_sta->pers.drv;
1034 rate_mask = rs_get_supported_rates(lq_sta, rate);
1035 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1037 low = high_low & 0xff;
1039 /* Bottom rate of column reached */
1040 if (low == IWL_RATE_INVALID)
1047 /* Get the next rate to use following a column downgrade */
1048 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1049 struct rs_rate *rate)
1051 struct iwl_mvm *mvm = lq_sta->pers.drv;
1053 if (is_legacy(rate)) {
1054 /* No column to downgrade from Legacy */
1056 } else if (is_siso(rate)) {
1057 /* Downgrade to Legacy if we were in SISO */
1058 if (lq_sta->band == NL80211_BAND_5GHZ)
1059 rate->type = LQ_LEGACY_A;
1061 rate->type = LQ_LEGACY_G;
1063 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1065 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1066 rate->index > IWL_RATE_MCS_9_INDEX);
1068 rate->index = rs_ht_to_legacy[rate->index];
1071 /* Downgrade to SISO with same MCS if in MIMO */
1072 rate->type = is_vht_mimo2(rate) ?
1073 LQ_VHT_SISO : LQ_HT_SISO;
1076 if (num_of_ant(rate->ant) > 1)
1077 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1079 /* Relevant in both switching to SISO or Legacy */
1082 if (!rs_rate_supported(lq_sta, rate))
1083 rs_get_lower_rate_in_column(lq_sta, rate);
1086 /* Check if both rates are identical
1087 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1088 * with a rate indicating STBC/BFER and ANT_AB.
1090 static inline bool rs_rate_equal(struct rs_rate *a,
1092 bool allow_ant_mismatch)
1095 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1096 (a->bfer == b->bfer);
1098 if (allow_ant_mismatch) {
1099 if (a->stbc || a->bfer) {
1100 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1101 a->stbc, a->bfer, a->ant);
1102 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1103 } else if (b->stbc || b->bfer) {
1104 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1105 b->stbc, b->bfer, b->ant);
1106 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1110 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1111 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1114 /* Check if both rates share the same column */
1115 static inline bool rs_rate_column_match(struct rs_rate *a,
1120 if (a->stbc || a->bfer)
1121 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1123 ant_match = (a->ant == b->ant);
1125 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1129 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1131 if (is_legacy(rate)) {
1132 if (rate->ant == ANT_A)
1133 return RS_COLUMN_LEGACY_ANT_A;
1135 if (rate->ant == ANT_B)
1136 return RS_COLUMN_LEGACY_ANT_B;
1141 if (is_siso(rate)) {
1142 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1143 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1144 RS_COLUMN_SISO_ANT_A;
1146 if (rate->ant == ANT_B)
1147 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1148 RS_COLUMN_SISO_ANT_B;
1154 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1157 return RS_COLUMN_INVALID;
1160 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1162 u8 tid = IWL_MAX_TID_COUNT;
1164 if (ieee80211_is_data_qos(hdr->frame_control)) {
1165 u8 *qc = ieee80211_get_qos_ctl(hdr);
1169 if (unlikely(tid > IWL_MAX_TID_COUNT))
1170 tid = IWL_MAX_TID_COUNT;
1175 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1176 int tid, struct ieee80211_tx_info *info, bool ndp)
1181 struct iwl_lq_cmd *table;
1183 struct rs_rate lq_rate, tx_resp_rate;
1184 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1185 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1186 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1187 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1188 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1189 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa,
1190 IWL_UCODE_TLV_API_LQ_SS_PARAMS);
1192 /* Treat uninitialized rate scaling data same as non-existing. */
1194 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1196 } else if (!lq_sta->pers.drv) {
1197 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1201 /* This packet was aggregated but doesn't carry status info */
1202 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1203 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1206 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1208 #ifdef CONFIG_MAC80211_DEBUGFS
1209 /* Disable last tx check if we are debugging with fixed rate but
1210 * update tx stats */
1211 if (lq_sta->pers.dbg_fixed_rate) {
1212 int index = tx_resp_rate.index;
1213 enum rs_column column;
1214 int attempts, success;
1216 column = rs_get_column_from_rate(&tx_resp_rate);
1217 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1218 "Can't map rate 0x%x to column",
1222 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1223 attempts = info->status.ampdu_len;
1224 success = info->status.ampdu_ack_len;
1226 attempts = info->status.rates[0].count;
1227 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1230 lq_sta->pers.tx_stats[column][index].total += attempts;
1231 lq_sta->pers.tx_stats[column][index].success += success;
1233 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1234 tx_resp_hwrate, success, attempts);
1239 if (time_after(jiffies,
1240 (unsigned long)(lq_sta->last_tx +
1241 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1244 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1245 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1246 ieee80211_stop_tx_ba_session(sta, t);
1248 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1251 lq_sta->last_tx = jiffies;
1253 /* Ignore this Tx frame response if its initial rate doesn't match
1254 * that of latest Link Quality command. There may be stragglers
1255 * from a previous Link Quality command, but we're no longer interested
1256 * in those; they're either from the "active" mode while we're trying
1257 * to check "search" mode, or a prior "search" mode after we've moved
1258 * to a new "search" mode (which might become the new "active" mode).
1260 table = &lq_sta->lq;
1261 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1262 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1264 /* Here we actually compare this rate to the latest LQ command */
1265 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1267 "initial tx resp rate 0x%x does not match 0x%x\n",
1268 tx_resp_hwrate, lq_hwrate);
1271 * Since rates mis-match, the last LQ command may have failed.
1272 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1275 lq_sta->missed_rate_counter++;
1276 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1277 lq_sta->missed_rate_counter = 0;
1279 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1281 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1283 /* Regardless, ignore this status info for outdated rate */
1286 /* Rate did match, so reset the missed_rate_counter */
1287 lq_sta->missed_rate_counter = 0;
1289 if (!lq_sta->search_better_tbl) {
1290 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1291 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1293 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1294 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1297 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1299 "Neither active nor search matches tx rate\n");
1300 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1301 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1302 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1303 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1304 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1307 * no matching table found, let's by-pass the data collection
1308 * and continue to perform rate scale to find the rate table
1310 rs_stay_in_table(lq_sta, true);
1315 * Updating the frame history depends on whether packets were
1318 * For aggregation, all packets were transmitted at the same rate, the
1319 * first index into rate scale table.
1321 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1322 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1323 info->status.ampdu_len,
1324 info->status.ampdu_ack_len,
1327 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1328 * it as a single frame loss as we don't want the success ratio
1329 * to dip too quickly because a BA wasn't received.
1330 * For TPC, there's no need for this optimisation since we want
1331 * to recover very quickly from a bad power reduction and,
1332 * therefore we'd like the success ratio to get an immediate hit
1333 * when failing to get a BA, so we'd switch back to a lower or
1334 * zero power reduction. When FW transmits agg with a rate
1335 * different from the initial rate, it will not use reduced txp
1336 * and will send BA notification twice (one empty with reduced
1337 * txp equal to the value from LQ and one with reduced txp 0).
1338 * We need to update counters for each txp level accordingly.
1340 if (info->status.ampdu_ack_len == 0)
1341 info->status.ampdu_len = 1;
1343 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1344 info->status.ampdu_len,
1345 info->status.ampdu_ack_len);
1347 /* Update success/fail counts if not searching for new mode */
1348 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1349 lq_sta->total_success += info->status.ampdu_ack_len;
1350 lq_sta->total_failed += (info->status.ampdu_len -
1351 info->status.ampdu_ack_len);
1354 /* For legacy, update frame history with for each Tx retry. */
1355 retries = info->status.rates[0].count - 1;
1356 /* HW doesn't send more than 15 retries */
1357 retries = min(retries, 15);
1359 /* The last transmission may have been successful */
1360 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1361 /* Collect data for each rate used during failed TX attempts */
1362 for (i = 0; i <= retries; ++i) {
1363 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1364 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1367 * Only collect stats if retried rate is in the same RS
1368 * table as active/search.
1370 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1372 else if (rs_rate_column_match(&lq_rate,
1374 tmp_tbl = other_tbl;
1378 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1380 i < retries ? 0 : legacy_success,
1382 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl,
1384 i < retries ? 0 : legacy_success);
1387 /* Update success/fail counts if not searching for new mode */
1388 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1389 lq_sta->total_success += legacy_success;
1390 lq_sta->total_failed += retries + (1 - legacy_success);
1393 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1394 lq_sta->last_rate_n_flags = lq_hwrate;
1395 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1397 /* See if there's a better rate or modulation mode to try. */
1398 if (sta->supp_rates[info->band])
1399 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1403 * mac80211 sends us Tx status
1405 static void rs_mac80211_tx_status(void *mvm_r,
1406 struct ieee80211_supported_band *sband,
1407 struct ieee80211_sta *sta, void *priv_sta,
1408 struct sk_buff *skb)
1410 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1411 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1412 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1413 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1415 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1418 if (!ieee80211_is_data(hdr->frame_control) ||
1419 info->flags & IEEE80211_TX_CTL_NO_ACK)
1422 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1423 ieee80211_is_qos_nullfunc(hdr->frame_control));
1427 * Begin a period of staying with a selected modulation mode.
1428 * Set "stay_in_tbl" flag to prevent any mode switches.
1429 * Set frame tx success limits according to legacy vs. high-throughput,
1430 * and reset overall (spanning all rates) tx success history statistics.
1431 * These control how long we stay using same modulation mode before
1432 * searching for a new mode.
1434 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1435 struct iwl_lq_sta *lq_sta)
1437 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1438 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1440 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1441 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1442 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1444 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1445 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1446 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1448 lq_sta->table_count = 0;
1449 lq_sta->total_failed = 0;
1450 lq_sta->total_success = 0;
1451 lq_sta->flush_timer = jiffies;
1452 lq_sta->visited_columns = 0;
1455 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1458 return find_last_bit(&rate_mask, BITS_PER_LONG);
1459 return IWL_RATE_INVALID;
1462 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1463 const struct rs_tx_column *column)
1465 switch (column->mode) {
1467 return lq_sta->max_legacy_rate_idx;
1469 return lq_sta->max_siso_rate_idx;
1471 return lq_sta->max_mimo2_rate_idx;
1476 return lq_sta->max_legacy_rate_idx;
1479 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1480 const struct rs_tx_column *column,
1483 /* Used to choose among HT tables */
1484 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1486 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1487 column->mode != RS_SISO &&
1488 column->mode != RS_MIMO2))
1489 return expected_tpt_legacy;
1491 /* Legacy rates have only one table */
1492 if (column->mode == RS_LEGACY)
1493 return expected_tpt_legacy;
1495 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1496 /* Choose among many HT tables depending on number of streams
1497 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1499 if (column->mode == RS_SISO) {
1501 case RATE_MCS_CHAN_WIDTH_20:
1502 ht_tbl_pointer = expected_tpt_siso_20MHz;
1504 case RATE_MCS_CHAN_WIDTH_40:
1505 ht_tbl_pointer = expected_tpt_siso_40MHz;
1507 case RATE_MCS_CHAN_WIDTH_80:
1508 ht_tbl_pointer = expected_tpt_siso_80MHz;
1510 case RATE_MCS_CHAN_WIDTH_160:
1511 ht_tbl_pointer = expected_tpt_siso_160MHz;
1516 } else if (column->mode == RS_MIMO2) {
1518 case RATE_MCS_CHAN_WIDTH_20:
1519 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1521 case RATE_MCS_CHAN_WIDTH_40:
1522 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1524 case RATE_MCS_CHAN_WIDTH_80:
1525 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1527 case RATE_MCS_CHAN_WIDTH_160:
1528 ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1537 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1538 return ht_tbl_pointer[0];
1539 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1540 return ht_tbl_pointer[1];
1541 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1542 return ht_tbl_pointer[2];
1544 return ht_tbl_pointer[3];
1547 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1548 struct iwl_scale_tbl_info *tbl)
1550 struct rs_rate *rate = &tbl->rate;
1551 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1553 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1556 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1557 struct iwl_lq_sta *lq_sta,
1558 struct iwl_scale_tbl_info *tbl, /* "search" */
1559 unsigned long rate_mask, s8 index)
1561 struct iwl_scale_tbl_info *active_tbl =
1562 &(lq_sta->lq_info[lq_sta->active_tbl]);
1563 s32 success_ratio = active_tbl->win[index].success_ratio;
1564 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1565 const u16 *tpt_tbl = tbl->expected_tpt;
1570 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1571 target_tpt = 100 * expected_current_tpt;
1573 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1574 success_ratio, target_tpt);
1576 target_tpt = lq_sta->last_tpt;
1578 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1579 success_ratio, target_tpt);
1582 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1584 while (rate_idx != IWL_RATE_INVALID) {
1585 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1588 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1591 rate_idx = (high_low >> 8) & 0xff;
1594 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1595 rate_idx, target_tpt,
1596 rate_idx != IWL_RATE_INVALID ?
1597 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1602 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1604 switch (sta->bandwidth) {
1605 case IEEE80211_STA_RX_BW_160:
1606 return RATE_MCS_CHAN_WIDTH_160;
1607 case IEEE80211_STA_RX_BW_80:
1608 return RATE_MCS_CHAN_WIDTH_80;
1609 case IEEE80211_STA_RX_BW_40:
1610 return RATE_MCS_CHAN_WIDTH_40;
1611 case IEEE80211_STA_RX_BW_20:
1613 return RATE_MCS_CHAN_WIDTH_20;
1618 * Check whether we should continue using same modulation mode, or
1619 * begin search for a new mode, based on:
1620 * 1) # tx successes or failures while using this mode
1621 * 2) # times calling this function
1622 * 3) elapsed time in this mode (not used, for now)
1624 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1626 struct iwl_scale_tbl_info *tbl;
1628 int flush_interval_passed = 0;
1629 struct iwl_mvm *mvm;
1631 mvm = lq_sta->pers.drv;
1632 active_tbl = lq_sta->active_tbl;
1634 tbl = &(lq_sta->lq_info[active_tbl]);
1636 /* If we've been disallowing search, see if we should now allow it */
1637 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1638 /* Elapsed time using current modulation mode */
1639 if (lq_sta->flush_timer)
1640 flush_interval_passed =
1642 (unsigned long)(lq_sta->flush_timer +
1643 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1646 * Check if we should allow search for new modulation mode.
1647 * If many frames have failed or succeeded, or we've used
1648 * this same modulation for a long time, allow search, and
1649 * reset history stats that keep track of whether we should
1650 * allow a new search. Also (below) reset all bitmaps and
1651 * stats in active history.
1654 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1655 (lq_sta->total_success > lq_sta->max_success_limit) ||
1656 ((!lq_sta->search_better_tbl) &&
1657 (lq_sta->flush_timer) && (flush_interval_passed))) {
1659 "LQ: stay is expired %d %d %d\n",
1660 lq_sta->total_failed,
1661 lq_sta->total_success,
1662 flush_interval_passed);
1664 /* Allow search for new mode */
1665 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1667 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1668 lq_sta->total_failed = 0;
1669 lq_sta->total_success = 0;
1670 lq_sta->flush_timer = 0;
1671 /* mark the current column as visited */
1672 lq_sta->visited_columns = BIT(tbl->column);
1674 * Else if we've used this modulation mode enough repetitions
1675 * (regardless of elapsed time or success/failure), reset
1676 * history bitmaps and rate-specific stats for all rates in
1680 lq_sta->table_count++;
1681 if (lq_sta->table_count >=
1682 lq_sta->table_count_limit) {
1683 lq_sta->table_count = 0;
1686 "LQ: stay in table clear win\n");
1687 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1691 /* If transitioning to allow "search", reset all history
1692 * bitmaps and stats in active table (this will become the new
1693 * "search" table). */
1694 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1695 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1700 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1701 struct iwl_scale_tbl_info *tbl,
1702 enum rs_action scale_action)
1704 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
1706 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1707 tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1708 scale_action == RS_ACTION_DOWNSCALE)
1709 sta_priv->tlc_amsdu = false;
1711 sta_priv->tlc_amsdu = true;
1715 * setup rate table in uCode
1717 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1718 struct ieee80211_sta *sta,
1719 struct iwl_lq_sta *lq_sta,
1720 struct iwl_scale_tbl_info *tbl)
1722 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1723 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1726 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1727 struct ieee80211_sta *sta,
1728 struct iwl_lq_sta *lq_sta,
1729 struct iwl_scale_tbl_info *tbl,
1730 enum rs_action scale_action)
1732 if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1735 if (!is_vht_siso(&tbl->rate))
1738 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1739 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1740 (scale_action == RS_ACTION_DOWNSCALE)) {
1741 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1742 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1743 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1747 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1748 * sustainable, i.e. we're past the test window. We can't go back
1749 * if MCS5 is just tested as this will happen always after switching
1750 * to 20Mhz MCS4 because the rate stats are cleared.
1752 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1753 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1754 (scale_action == RS_ACTION_STAY)) ||
1755 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1756 (scale_action == RS_ACTION_UPSCALE)))) {
1757 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1758 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1759 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1766 rs_set_expected_tpt_table(lq_sta, tbl);
1767 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1771 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1772 struct iwl_lq_sta *lq_sta,
1773 struct ieee80211_sta *sta,
1774 struct iwl_scale_tbl_info *tbl)
1777 enum rs_column next_col_id;
1778 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1779 const struct rs_tx_column *next_col;
1780 allow_column_func_t allow_func;
1781 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1782 const u16 *expected_tpt_tbl;
1783 u16 tpt, max_expected_tpt;
1785 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1786 next_col_id = curr_col->next_columns[i];
1788 if (next_col_id == RS_COLUMN_INVALID)
1791 if (lq_sta->visited_columns & BIT(next_col_id)) {
1792 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1797 next_col = &rs_tx_columns[next_col_id];
1799 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1801 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1802 next_col_id, valid_ants, next_col->ant);
1806 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1807 allow_func = next_col->checks[j];
1808 if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1813 if (j != MAX_COLUMN_CHECKS) {
1815 "Skip column %d: not allowed (check %d failed)\n",
1821 tpt = lq_sta->last_tpt / 100;
1822 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1823 rs_bw_from_sta_bw(sta));
1824 if (WARN_ON_ONCE(!expected_tpt_tbl))
1827 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1828 if (max_rate == IWL_RATE_INVALID) {
1830 "Skip column %d: no rate is allowed in this column\n",
1835 max_expected_tpt = expected_tpt_tbl[max_rate];
1836 if (tpt >= max_expected_tpt) {
1838 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1839 next_col_id, max_expected_tpt, tpt);
1844 "Found potential column %d. Max expected %d current %d\n",
1845 next_col_id, max_expected_tpt, tpt);
1849 if (i == MAX_NEXT_COLUMNS)
1850 return RS_COLUMN_INVALID;
1855 static int rs_switch_to_column(struct iwl_mvm *mvm,
1856 struct iwl_lq_sta *lq_sta,
1857 struct ieee80211_sta *sta,
1858 enum rs_column col_id)
1860 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1861 struct iwl_scale_tbl_info *search_tbl =
1862 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1863 struct rs_rate *rate = &search_tbl->rate;
1864 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1865 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1866 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1867 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1868 unsigned long rate_mask = 0;
1871 memcpy(search_tbl, tbl, sz);
1873 rate->sgi = column->sgi;
1874 rate->ant = column->ant;
1876 if (column->mode == RS_LEGACY) {
1877 if (lq_sta->band == NL80211_BAND_5GHZ)
1878 rate->type = LQ_LEGACY_A;
1880 rate->type = LQ_LEGACY_G;
1882 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1884 rate_mask = lq_sta->active_legacy_rate;
1885 } else if (column->mode == RS_SISO) {
1886 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1887 rate_mask = lq_sta->active_siso_rate;
1888 } else if (column->mode == RS_MIMO2) {
1889 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1890 rate_mask = lq_sta->active_mimo2_rate;
1892 WARN_ONCE(1, "Bad column mode");
1895 if (column->mode != RS_LEGACY) {
1896 rate->bw = rs_bw_from_sta_bw(sta);
1897 rate->ldpc = lq_sta->ldpc;
1900 search_tbl->column = col_id;
1901 rs_set_expected_tpt_table(lq_sta, search_tbl);
1903 lq_sta->visited_columns |= BIT(col_id);
1905 /* Get the best matching rate if we're changing modes. e.g.
1906 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1908 if (curr_column->mode != column->mode) {
1909 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1910 rate_mask, rate->index);
1912 if ((rate_idx == IWL_RATE_INVALID) ||
1913 !(BIT(rate_idx) & rate_mask)) {
1915 "can not switch with index %d"
1917 rate_idx, rate_mask);
1922 rate->index = rate_idx;
1925 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1926 col_id, rate->index);
1931 rate->type = LQ_NONE;
1935 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1936 struct iwl_scale_tbl_info *tbl,
1937 s32 sr, int low, int high,
1939 int low_tpt, int high_tpt)
1941 enum rs_action action = RS_ACTION_STAY;
1943 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1944 (current_tpt == 0)) {
1946 "Decrease rate because of low SR\n");
1947 return RS_ACTION_DOWNSCALE;
1950 if ((low_tpt == IWL_INVALID_VALUE) &&
1951 (high_tpt == IWL_INVALID_VALUE) &&
1952 (high != IWL_RATE_INVALID)) {
1954 "No data about high/low rates. Increase rate\n");
1955 return RS_ACTION_UPSCALE;
1958 if ((high_tpt == IWL_INVALID_VALUE) &&
1959 (high != IWL_RATE_INVALID) &&
1960 (low_tpt != IWL_INVALID_VALUE) &&
1961 (low_tpt < current_tpt)) {
1963 "No data about high rate and low rate is worse. Increase rate\n");
1964 return RS_ACTION_UPSCALE;
1967 if ((high_tpt != IWL_INVALID_VALUE) &&
1968 (high_tpt > current_tpt)) {
1970 "Higher rate is better. Increate rate\n");
1971 return RS_ACTION_UPSCALE;
1974 if ((low_tpt != IWL_INVALID_VALUE) &&
1975 (high_tpt != IWL_INVALID_VALUE) &&
1976 (low_tpt < current_tpt) &&
1977 (high_tpt < current_tpt)) {
1979 "Both high and low are worse. Maintain rate\n");
1980 return RS_ACTION_STAY;
1983 if ((low_tpt != IWL_INVALID_VALUE) &&
1984 (low_tpt > current_tpt)) {
1986 "Lower rate is better\n");
1987 action = RS_ACTION_DOWNSCALE;
1991 if ((low_tpt == IWL_INVALID_VALUE) &&
1992 (low != IWL_RATE_INVALID)) {
1994 "No data about lower rate\n");
1995 action = RS_ACTION_DOWNSCALE;
1999 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2002 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2003 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2005 "SR is above NO DECREASE. Avoid downscale\n");
2006 action = RS_ACTION_STAY;
2007 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2009 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2010 action = RS_ACTION_STAY;
2012 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2019 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2020 struct iwl_lq_sta *lq_sta)
2022 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2023 * supports STBC of at least 1*SS
2025 if (!lq_sta->stbc_capable)
2028 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2034 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2035 int *weaker, int *stronger)
2037 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2038 if (*weaker > TPC_MAX_REDUCTION)
2039 *weaker = TPC_INVALID;
2041 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2043 *stronger = TPC_INVALID;
2046 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2047 struct rs_rate *rate, enum nl80211_band band)
2049 int index = rate->index;
2050 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2051 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2054 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2055 cam, sta_ps_disabled);
2057 * allow tpc only if power management is enabled, or bt coex
2058 * activity grade allows it and we are on 2.4Ghz.
2060 if ((cam || sta_ps_disabled) &&
2061 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2064 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2065 if (is_legacy(rate))
2066 return index == IWL_RATE_54M_INDEX;
2068 return index == IWL_RATE_MCS_7_INDEX;
2070 return index == IWL_RATE_MCS_7_INDEX ||
2071 index == IWL_RATE_MCS_8_INDEX ||
2072 index == IWL_RATE_MCS_9_INDEX;
2080 TPC_ACTION_DECREASE,
2081 TPC_ACTION_INCREASE,
2082 TPC_ACTION_NO_RESTIRCTION,
2085 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2086 s32 sr, int weak, int strong,
2088 int weak_tpt, int strong_tpt)
2090 /* stay until we have valid tpt */
2091 if (current_tpt == IWL_INVALID_VALUE) {
2092 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2093 return TPC_ACTION_STAY;
2096 /* Too many failures, increase txp */
2097 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2099 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2100 return TPC_ACTION_NO_RESTIRCTION;
2103 /* try decreasing first if applicable */
2104 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2105 weak != TPC_INVALID) {
2106 if (weak_tpt == IWL_INVALID_VALUE &&
2107 (strong_tpt == IWL_INVALID_VALUE ||
2108 current_tpt >= strong_tpt)) {
2110 "no weak txp measurement. decrease txp\n");
2111 return TPC_ACTION_DECREASE;
2114 if (weak_tpt > current_tpt) {
2116 "lower txp has better tpt. decrease txp\n");
2117 return TPC_ACTION_DECREASE;
2121 /* next, increase if needed */
2122 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2123 strong != TPC_INVALID) {
2124 if (weak_tpt == IWL_INVALID_VALUE &&
2125 strong_tpt != IWL_INVALID_VALUE &&
2126 current_tpt < strong_tpt) {
2128 "higher txp has better tpt. increase txp\n");
2129 return TPC_ACTION_INCREASE;
2132 if (weak_tpt < current_tpt &&
2133 (strong_tpt == IWL_INVALID_VALUE ||
2134 strong_tpt > current_tpt)) {
2136 "lower txp has worse tpt. increase txp\n");
2137 return TPC_ACTION_INCREASE;
2141 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2142 return TPC_ACTION_STAY;
2145 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2146 struct ieee80211_sta *sta,
2147 struct iwl_lq_sta *lq_sta,
2148 struct iwl_scale_tbl_info *tbl)
2150 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2151 struct ieee80211_vif *vif = mvm_sta->vif;
2152 struct ieee80211_chanctx_conf *chanctx_conf;
2153 enum nl80211_band band;
2154 struct iwl_rate_scale_data *window;
2155 struct rs_rate *rate = &tbl->rate;
2156 enum tpc_action action;
2158 u8 cur = lq_sta->lq.reduced_tpc;
2161 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2163 #ifdef CONFIG_MAC80211_DEBUGFS
2164 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2165 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2166 lq_sta->pers.dbg_fixed_txp_reduction);
2167 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2168 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2173 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2174 if (WARN_ON(!chanctx_conf))
2175 band = NUM_NL80211_BANDS;
2177 band = chanctx_conf->def.chan->band;
2180 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2182 "tpc is not allowed. remove txp restrictions\n");
2183 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2184 return cur != TPC_NO_REDUCTION;
2187 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2189 /* Collect measured throughputs for current and adjacent rates */
2190 window = tbl->tpc_win;
2191 sr = window[cur].success_ratio;
2192 current_tpt = window[cur].average_tpt;
2193 if (weak != TPC_INVALID)
2194 weak_tpt = window[weak].average_tpt;
2195 if (strong != TPC_INVALID)
2196 strong_tpt = window[strong].average_tpt;
2199 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2200 cur, current_tpt, sr, weak, strong,
2201 weak_tpt, strong_tpt);
2203 action = rs_get_tpc_action(mvm, sr, weak, strong,
2204 current_tpt, weak_tpt, strong_tpt);
2206 /* override actions if we are on the edge */
2207 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2208 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2209 action = TPC_ACTION_STAY;
2210 } else if (strong == TPC_INVALID &&
2211 (action == TPC_ACTION_INCREASE ||
2212 action == TPC_ACTION_NO_RESTIRCTION)) {
2213 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2214 action = TPC_ACTION_STAY;
2218 case TPC_ACTION_DECREASE:
2219 lq_sta->lq.reduced_tpc = weak;
2221 case TPC_ACTION_INCREASE:
2222 lq_sta->lq.reduced_tpc = strong;
2224 case TPC_ACTION_NO_RESTIRCTION:
2225 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2227 case TPC_ACTION_STAY:
2235 * Do rate scaling and search for new modulation mode.
2237 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2238 struct ieee80211_sta *sta,
2239 struct iwl_lq_sta *lq_sta,
2242 int low = IWL_RATE_INVALID;
2243 int high = IWL_RATE_INVALID;
2245 struct iwl_rate_scale_data *window = NULL;
2246 int current_tpt = IWL_INVALID_VALUE;
2247 int low_tpt = IWL_INVALID_VALUE;
2248 int high_tpt = IWL_INVALID_VALUE;
2250 enum rs_action scale_action = RS_ACTION_STAY;
2253 struct iwl_scale_tbl_info *tbl, *tbl1;
2258 u8 prev_agg = lq_sta->is_agg;
2259 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2260 struct iwl_mvm_tid_data *tid_data;
2261 struct rs_rate *rate;
2263 lq_sta->is_agg = !!sta_priv->agg_tids;
2266 * Select rate-scale / modulation-mode table to work with in
2267 * the rest of this function: "search" if searching for better
2268 * modulation mode, or "active" if doing rate scaling within a mode.
2270 if (!lq_sta->search_better_tbl)
2271 active_tbl = lq_sta->active_tbl;
2273 active_tbl = 1 - lq_sta->active_tbl;
2275 tbl = &(lq_sta->lq_info[active_tbl]);
2278 if (prev_agg != lq_sta->is_agg) {
2280 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2281 prev_agg, lq_sta->is_agg);
2282 rs_set_expected_tpt_table(lq_sta, tbl);
2283 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2286 /* current tx rate */
2287 index = rate->index;
2289 /* rates available for this association, and for modulation mode */
2290 rate_mask = rs_get_supported_rates(lq_sta, rate);
2292 if (!(BIT(index) & rate_mask)) {
2293 IWL_ERR(mvm, "Current Rate is not valid\n");
2294 if (lq_sta->search_better_tbl) {
2295 /* revert to active table if search table is not valid*/
2296 rate->type = LQ_NONE;
2297 lq_sta->search_better_tbl = 0;
2298 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2299 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2304 /* Get expected throughput table and history window for current rate */
2305 if (!tbl->expected_tpt) {
2306 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2310 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2311 window = &(tbl->win[index]);
2314 * If there is not enough history to calculate actual average
2315 * throughput, keep analyzing results of more tx frames, without
2316 * changing rate or mode (bypass most of the rest of this function).
2317 * Set up new rate table in uCode only if old rate is not supported
2318 * in current association (use new rate found above).
2320 fail_count = window->counter - window->success_counter;
2321 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2322 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2324 "%s: Test Window: succ %d total %d\n",
2325 rs_pretty_rate(rate),
2326 window->success_counter, window->counter);
2328 /* Can't calculate this yet; not enough history */
2329 window->average_tpt = IWL_INVALID_VALUE;
2331 /* Should we stay with this modulation mode,
2332 * or search for a new one? */
2333 rs_stay_in_table(lq_sta, false);
2338 /* If we are searching for better modulation mode, check success. */
2339 if (lq_sta->search_better_tbl) {
2340 /* If good success, continue using the "search" mode;
2341 * no need to send new link quality command, since we're
2342 * continuing to use the setup that we've been trying. */
2343 if (window->average_tpt > lq_sta->last_tpt) {
2345 "SWITCHING TO NEW TABLE SR: %d "
2346 "cur-tpt %d old-tpt %d\n",
2347 window->success_ratio,
2348 window->average_tpt,
2351 /* Swap tables; "search" becomes "active" */
2352 lq_sta->active_tbl = active_tbl;
2353 current_tpt = window->average_tpt;
2354 /* Else poor success; go back to mode in "active" table */
2357 "GOING BACK TO THE OLD TABLE: SR %d "
2358 "cur-tpt %d old-tpt %d\n",
2359 window->success_ratio,
2360 window->average_tpt,
2363 /* Nullify "search" table */
2364 rate->type = LQ_NONE;
2366 /* Revert to "active" table */
2367 active_tbl = lq_sta->active_tbl;
2368 tbl = &(lq_sta->lq_info[active_tbl]);
2370 /* Revert to "active" rate and throughput info */
2371 index = tbl->rate.index;
2372 current_tpt = lq_sta->last_tpt;
2374 /* Need to set up a new rate table in uCode */
2378 /* Either way, we've made a decision; modulation mode
2379 * search is done, allow rate adjustment next time. */
2380 lq_sta->search_better_tbl = 0;
2381 done_search = 1; /* Don't switch modes below! */
2385 /* (Else) not in search of better modulation mode, try for better
2386 * starting rate, while staying in this mode. */
2387 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2388 low = high_low & 0xff;
2389 high = (high_low >> 8) & 0xff;
2391 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2393 sr = window->success_ratio;
2395 /* Collect measured throughputs for current and adjacent rates */
2396 current_tpt = window->average_tpt;
2397 if (low != IWL_RATE_INVALID)
2398 low_tpt = tbl->win[low].average_tpt;
2399 if (high != IWL_RATE_INVALID)
2400 high_tpt = tbl->win[high].average_tpt;
2403 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2404 rs_pretty_rate(rate), current_tpt, sr,
2405 low, high, low_tpt, high_tpt);
2407 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2408 current_tpt, low_tpt, high_tpt);
2410 /* Force a search in case BT doesn't like us being in MIMO */
2411 if (is_mimo(rate) &&
2412 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2414 "BT Coex forbids MIMO. Search for new config\n");
2415 rs_stay_in_table(lq_sta, true);
2419 switch (scale_action) {
2420 case RS_ACTION_DOWNSCALE:
2421 /* Decrease starting rate, update uCode's rate table */
2422 if (low != IWL_RATE_INVALID) {
2427 "At the bottom rate. Can't decrease\n");
2431 case RS_ACTION_UPSCALE:
2432 /* Increase starting rate, update uCode's rate table */
2433 if (high != IWL_RATE_INVALID) {
2438 "At the top rate. Can't increase\n");
2442 case RS_ACTION_STAY:
2444 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2445 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2452 /* Replace uCode's rate table for the destination station. */
2454 tbl->rate.index = index;
2455 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2456 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2457 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2458 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2461 rs_stay_in_table(lq_sta, false);
2464 * Search for new modulation mode if we're:
2465 * 1) Not changing rates right now
2466 * 2) Not just finishing up a search
2467 * 3) Allowing a new search
2469 if (!update_lq && !done_search &&
2470 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2471 && window->counter) {
2472 enum rs_column next_column;
2474 /* Save current throughput to compare with "search" throughput*/
2475 lq_sta->last_tpt = current_tpt;
2478 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2479 update_lq, done_search, lq_sta->rs_state,
2482 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2483 if (next_column != RS_COLUMN_INVALID) {
2484 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2487 lq_sta->search_better_tbl = 1;
2490 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2491 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2494 /* If new "search" mode was selected, set up in uCode table */
2495 if (lq_sta->search_better_tbl) {
2496 /* Access the "search" table, clear its history. */
2497 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2498 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2500 /* Use new "search" start rate */
2501 index = tbl->rate.index;
2503 rs_dump_rate(mvm, &tbl->rate,
2504 "Switch to SEARCH TABLE:");
2505 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2511 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2512 /* If the "active" (non-search) mode was legacy,
2513 * and we've tried switching antennas,
2514 * but we haven't been able to try HT modes (not available),
2515 * stay with best antenna legacy modulation for a while
2516 * before next round of mode comparisons. */
2517 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2518 if (is_legacy(&tbl1->rate)) {
2519 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2521 if (tid != IWL_MAX_TID_COUNT) {
2522 tid_data = &sta_priv->tid_data[tid];
2523 if (tid_data->state != IWL_AGG_OFF) {
2525 "Stop aggregation on tid %d\n",
2527 ieee80211_stop_tx_ba_session(sta, tid);
2530 rs_set_stay_in_table(mvm, 1, lq_sta);
2532 /* If we're in an HT mode, and all 3 mode switch actions
2533 * have been tried and compared, stay in this best modulation
2534 * mode for a while before next round of mode comparisons. */
2535 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2536 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2537 (tid != IWL_MAX_TID_COUNT)) {
2538 tid_data = &sta_priv->tid_data[tid];
2539 if (tid_data->state == IWL_AGG_OFF && !ndp) {
2541 "try to aggregate tid %d\n",
2543 rs_tl_turn_on_agg(mvm, tid,
2547 rs_set_stay_in_table(mvm, 0, lq_sta);
2552 struct rs_init_rate_info {
2557 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2558 { -60, IWL_RATE_54M_INDEX },
2559 { -64, IWL_RATE_48M_INDEX },
2560 { -68, IWL_RATE_36M_INDEX },
2561 { -80, IWL_RATE_24M_INDEX },
2562 { -84, IWL_RATE_18M_INDEX },
2563 { -85, IWL_RATE_12M_INDEX },
2564 { -86, IWL_RATE_11M_INDEX },
2565 { -88, IWL_RATE_5M_INDEX },
2566 { -90, IWL_RATE_2M_INDEX },
2567 { S8_MIN, IWL_RATE_1M_INDEX },
2570 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2571 { -60, IWL_RATE_54M_INDEX },
2572 { -64, IWL_RATE_48M_INDEX },
2573 { -72, IWL_RATE_36M_INDEX },
2574 { -80, IWL_RATE_24M_INDEX },
2575 { -84, IWL_RATE_18M_INDEX },
2576 { -85, IWL_RATE_12M_INDEX },
2577 { -87, IWL_RATE_9M_INDEX },
2578 { S8_MIN, IWL_RATE_6M_INDEX },
2581 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2582 { -60, IWL_RATE_MCS_7_INDEX },
2583 { -64, IWL_RATE_MCS_6_INDEX },
2584 { -68, IWL_RATE_MCS_5_INDEX },
2585 { -72, IWL_RATE_MCS_4_INDEX },
2586 { -80, IWL_RATE_MCS_3_INDEX },
2587 { -84, IWL_RATE_MCS_2_INDEX },
2588 { -85, IWL_RATE_MCS_1_INDEX },
2589 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2592 /* MCS index 9 is not valid for 20MHz VHT channel width,
2593 * but is ok for 40, 80 and 160MHz channels.
2595 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2596 { -60, IWL_RATE_MCS_8_INDEX },
2597 { -64, IWL_RATE_MCS_7_INDEX },
2598 { -68, IWL_RATE_MCS_6_INDEX },
2599 { -72, IWL_RATE_MCS_5_INDEX },
2600 { -80, IWL_RATE_MCS_4_INDEX },
2601 { -84, IWL_RATE_MCS_3_INDEX },
2602 { -85, IWL_RATE_MCS_2_INDEX },
2603 { -87, IWL_RATE_MCS_1_INDEX },
2604 { S8_MIN, IWL_RATE_MCS_0_INDEX},
2607 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2608 { -60, IWL_RATE_MCS_9_INDEX },
2609 { -64, IWL_RATE_MCS_8_INDEX },
2610 { -68, IWL_RATE_MCS_7_INDEX },
2611 { -72, IWL_RATE_MCS_6_INDEX },
2612 { -80, IWL_RATE_MCS_5_INDEX },
2613 { -84, IWL_RATE_MCS_4_INDEX },
2614 { -85, IWL_RATE_MCS_3_INDEX },
2615 { -87, IWL_RATE_MCS_2_INDEX },
2616 { -88, IWL_RATE_MCS_1_INDEX },
2617 { S8_MIN, IWL_RATE_MCS_0_INDEX },
2620 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2622 /* Init the optimal rate based on STA caps
2623 * This combined with rssi is used to report the last tx rate
2624 * to userspace when we haven't transmitted enough frames.
2626 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2627 struct ieee80211_sta *sta,
2628 struct iwl_lq_sta *lq_sta)
2630 struct rs_rate *rate = &lq_sta->optimal_rate;
2632 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2633 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2634 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2635 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2636 else if (lq_sta->band == NL80211_BAND_5GHZ)
2637 rate->type = LQ_LEGACY_A;
2639 rate->type = LQ_LEGACY_G;
2641 rate->bw = rs_bw_from_sta_bw(sta);
2642 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2644 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2646 if (is_mimo(rate)) {
2647 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2648 } else if (is_siso(rate)) {
2649 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2651 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2653 if (lq_sta->band == NL80211_BAND_5GHZ) {
2654 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2655 lq_sta->optimal_nentries =
2656 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2658 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2659 lq_sta->optimal_nentries =
2660 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2665 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2666 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2667 lq_sta->optimal_nentries =
2668 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2670 lq_sta->optimal_rates = rs_optimal_rates_vht;
2671 lq_sta->optimal_nentries =
2672 ARRAY_SIZE(rs_optimal_rates_vht);
2674 } else if (is_ht(rate)) {
2675 lq_sta->optimal_rates = rs_optimal_rates_ht;
2676 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2680 /* Compute the optimal rate index based on RSSI */
2681 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2682 struct iwl_lq_sta *lq_sta)
2684 struct rs_rate *rate = &lq_sta->optimal_rate;
2687 rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2690 for (i = 0; i < lq_sta->optimal_nentries; i++) {
2691 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2693 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2694 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2695 rate->index = rate_idx;
2703 /* Choose an initial legacy rate and antenna to use based on the RSSI
2706 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2707 struct ieee80211_sta *sta,
2708 struct iwl_lq_sta *lq_sta,
2709 enum nl80211_band band,
2710 struct rs_rate *rate)
2713 unsigned long active_rate;
2714 s8 best_rssi = S8_MIN;
2715 u8 best_ant = ANT_NONE;
2716 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2717 const struct rs_init_rate_info *initial_rates;
2719 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2720 if (!(lq_sta->pers.chains & BIT(i)))
2723 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2724 best_rssi = lq_sta->pers.chain_signal[i];
2729 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2730 rs_pretty_ant(best_ant), best_rssi);
2732 if (best_ant != ANT_A && best_ant != ANT_B)
2733 rate->ant = first_antenna(valid_tx_ant);
2735 rate->ant = best_ant;
2739 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2741 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2744 if (band == NL80211_BAND_5GHZ) {
2745 rate->type = LQ_LEGACY_A;
2746 initial_rates = rs_optimal_rates_5ghz_legacy;
2747 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2749 rate->type = LQ_LEGACY_G;
2750 initial_rates = rs_optimal_rates_24ghz_legacy;
2751 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2754 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2757 /* Start from a higher rate if the corresponding debug capability
2758 * is enabled. The rate is chosen according to AP capabilities.
2759 * In case of VHT/HT when the rssi is low fallback to the case of
2762 if (sta->vht_cap.vht_supported &&
2763 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2764 switch (sta->bandwidth) {
2765 case IEEE80211_STA_RX_BW_160:
2766 case IEEE80211_STA_RX_BW_80:
2767 case IEEE80211_STA_RX_BW_40:
2768 initial_rates = rs_optimal_rates_vht;
2769 nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2771 case IEEE80211_STA_RX_BW_20:
2772 initial_rates = rs_optimal_rates_vht_20mhz;
2773 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2776 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2780 active_rate = lq_sta->active_siso_rate;
2781 rate->type = LQ_VHT_SISO;
2782 rate->bw = rs_bw_from_sta_bw(sta);
2783 } else if (sta->ht_cap.ht_supported &&
2784 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2785 initial_rates = rs_optimal_rates_ht;
2786 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2787 active_rate = lq_sta->active_siso_rate;
2788 rate->type = LQ_HT_SISO;
2790 active_rate = lq_sta->active_legacy_rate;
2793 for (i = 0; i < nentries; i++) {
2794 int rate_idx = initial_rates[i].rate_idx;
2796 if ((best_rssi >= initial_rates[i].rssi) &&
2797 (BIT(rate_idx) & active_rate)) {
2798 rate->index = rate_idx;
2804 rs_dump_rate(mvm, rate, "INITIAL");
2807 /* Save info about RSSI of last Rx */
2808 void rs_update_last_rssi(struct iwl_mvm *mvm,
2809 struct iwl_lq_sta *lq_sta,
2810 struct ieee80211_rx_status *rx_status)
2814 lq_sta->pers.chains = rx_status->chains;
2815 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2816 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2817 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2818 lq_sta->pers.last_rssi = S8_MIN;
2820 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2821 if (!(lq_sta->pers.chains & BIT(i)))
2824 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2825 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2830 * rs_initialize_lq - Initialize a station's hardware rate table
2832 * The uCode's station table contains a table of fallback rates
2833 * for automatic fallback during transmission.
2835 * NOTE: This sets up a default set of values. These will be replaced later
2836 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2839 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2840 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2841 * which requires station table entry to exist).
2843 static void rs_initialize_lq(struct iwl_mvm *mvm,
2844 struct ieee80211_sta *sta,
2845 struct iwl_lq_sta *lq_sta,
2846 enum nl80211_band band,
2849 struct iwl_scale_tbl_info *tbl;
2850 struct rs_rate *rate;
2853 if (!sta || !lq_sta)
2856 if (!lq_sta->search_better_tbl)
2857 active_tbl = lq_sta->active_tbl;
2859 active_tbl = 1 - lq_sta->active_tbl;
2861 tbl = &(lq_sta->lq_info[active_tbl]);
2864 rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2865 rs_init_optimal_rate(mvm, sta, lq_sta);
2867 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2868 tbl->column = rs_get_column_from_rate(rate);
2870 rs_set_expected_tpt_table(lq_sta, tbl);
2871 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2872 /* TODO restore station should remember the lq cmd */
2873 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2876 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2877 struct ieee80211_tx_rate_control *txrc)
2879 struct sk_buff *skb = txrc->skb;
2880 struct iwl_op_mode *op_mode __maybe_unused =
2881 (struct iwl_op_mode *)mvm_r;
2882 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2883 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2884 struct iwl_lq_sta *lq_sta = mvm_sta;
2885 struct rs_rate *optimal_rate;
2886 u32 last_ucode_rate;
2888 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2889 /* if vif isn't initialized mvm doesn't know about
2890 * this station, so don't do anything with the it
2896 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2898 /* Treat uninitialized rate scaling data same as non-existing. */
2899 if (lq_sta && !lq_sta->pers.drv) {
2900 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2904 /* Send management frames and NO_ACK data using lowest rate. */
2905 if (rate_control_send_low(sta, mvm_sta, txrc))
2908 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2909 info->band, &info->control.rates[0]);
2910 info->control.rates[0].count = 1;
2912 /* Report the optimal rate based on rssi and STA caps if we haven't
2913 * converged yet (too little traffic) or exploring other modulations
2915 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2916 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2917 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2919 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2920 &txrc->reported_rate);
2924 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2927 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2928 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2929 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2930 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2932 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2934 lq_sta->pers.drv = mvm;
2935 #ifdef CONFIG_MAC80211_DEBUGFS
2936 lq_sta->pers.dbg_fixed_rate = 0;
2937 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2938 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2940 lq_sta->pers.chains = 0;
2941 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2942 lq_sta->pers.last_rssi = S8_MIN;
2944 return &sta_priv->lq_sta;
2947 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2950 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2951 (0x3 << (2 * (nss - 1)));
2952 rx_mcs >>= (2 * (nss - 1));
2954 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2955 return IWL_RATE_MCS_7_INDEX;
2956 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2957 return IWL_RATE_MCS_8_INDEX;
2958 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2959 return IWL_RATE_MCS_9_INDEX;
2961 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2965 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2966 struct ieee80211_sta_vht_cap *vht_cap,
2967 struct iwl_lq_sta *lq_sta)
2970 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2972 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2973 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2974 if (i == IWL_RATE_9M_INDEX)
2977 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2978 if (i == IWL_RATE_MCS_9_INDEX &&
2979 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2982 lq_sta->active_siso_rate |= BIT(i);
2986 if (sta->rx_nss < 2)
2989 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2990 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2991 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2992 if (i == IWL_RATE_9M_INDEX)
2995 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2996 if (i == IWL_RATE_MCS_9_INDEX &&
2997 sta->bandwidth == IEEE80211_STA_RX_BW_20)
3000 lq_sta->active_mimo2_rate |= BIT(i);
3005 static void rs_ht_init(struct iwl_mvm *mvm,
3006 struct ieee80211_sta *sta,
3007 struct iwl_lq_sta *lq_sta,
3008 struct ieee80211_sta_ht_cap *ht_cap)
3010 /* active_siso_rate mask includes 9 MBits (bit 5),
3011 * and CCK (bits 0-3), supp_rates[] does not;
3012 * shift to convert format, force 9 MBits off.
3014 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3015 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3016 lq_sta->active_siso_rate &= ~((u16)0x2);
3017 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3019 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3020 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3021 lq_sta->active_mimo2_rate &= ~((u16)0x2);
3022 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3024 if (mvm->cfg->ht_params->ldpc &&
3025 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3026 lq_sta->ldpc = true;
3028 if (mvm->cfg->ht_params->stbc &&
3029 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3030 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3031 lq_sta->stbc_capable = true;
3033 lq_sta->is_vht = false;
3036 static void rs_vht_init(struct iwl_mvm *mvm,
3037 struct ieee80211_sta *sta,
3038 struct iwl_lq_sta *lq_sta,
3039 struct ieee80211_sta_vht_cap *vht_cap)
3041 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3043 if (mvm->cfg->ht_params->ldpc &&
3044 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3045 lq_sta->ldpc = true;
3047 if (mvm->cfg->ht_params->stbc &&
3048 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3049 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3050 lq_sta->stbc_capable = true;
3052 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3053 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3054 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3055 lq_sta->bfer_capable = true;
3057 lq_sta->is_vht = true;
3060 #ifdef CONFIG_IWLWIFI_DEBUGFS
3061 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3063 spin_lock_bh(&mvm->drv_stats_lock);
3064 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3065 spin_unlock_bh(&mvm->drv_stats_lock);
3068 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3072 spin_lock(&mvm->drv_stats_lock);
3075 mvm->drv_rx_stats.agg_frames++;
3077 mvm->drv_rx_stats.success_frames++;
3079 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3080 case RATE_MCS_CHAN_WIDTH_20:
3081 mvm->drv_rx_stats.bw_20_frames++;
3083 case RATE_MCS_CHAN_WIDTH_40:
3084 mvm->drv_rx_stats.bw_40_frames++;
3086 case RATE_MCS_CHAN_WIDTH_80:
3087 mvm->drv_rx_stats.bw_80_frames++;
3089 case RATE_MCS_CHAN_WIDTH_160:
3090 mvm->drv_rx_stats.bw_160_frames++;
3093 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3096 if (rate & RATE_MCS_HT_MSK) {
3097 mvm->drv_rx_stats.ht_frames++;
3098 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3099 } else if (rate & RATE_MCS_VHT_MSK) {
3100 mvm->drv_rx_stats.vht_frames++;
3101 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3102 RATE_VHT_MCS_NSS_POS) + 1;
3104 mvm->drv_rx_stats.legacy_frames++;
3108 mvm->drv_rx_stats.siso_frames++;
3110 mvm->drv_rx_stats.mimo2_frames++;
3112 if (rate & RATE_MCS_SGI_MSK)
3113 mvm->drv_rx_stats.sgi_frames++;
3115 mvm->drv_rx_stats.ngi_frames++;
3117 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3118 mvm->drv_rx_stats.last_frame_idx =
3119 (mvm->drv_rx_stats.last_frame_idx + 1) %
3120 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3122 spin_unlock(&mvm->drv_stats_lock);
3127 * Called after adding a new station to initialize rate scaling
3129 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3130 enum nl80211_band band, bool init)
3133 struct ieee80211_hw *hw = mvm->hw;
3134 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3135 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3136 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
3137 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
3138 struct ieee80211_supported_band *sband;
3139 unsigned long supp; /* must be unsigned long for for_each_set_bit */
3141 /* clear all non-persistent lq data */
3142 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3144 sband = hw->wiphy->bands[band];
3146 lq_sta->lq.sta_id = sta_priv->sta_id;
3147 sta_priv->tlc_amsdu = false;
3149 for (j = 0; j < LQ_SIZE; j++)
3150 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3152 lq_sta->flush_timer = 0;
3153 lq_sta->last_tx = jiffies;
3156 "LQ: *** rate scale station global init for station %d ***\n",
3158 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3159 * the lowest or the highest rate.. Could consider using RSSI from
3160 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3163 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3164 lq_sta->band = sband->band;
3166 * active legacy rates as per supported rates bitmap
3168 supp = sta->supp_rates[sband->band];
3169 lq_sta->active_legacy_rate = 0;
3170 for_each_set_bit(i, &supp, BITS_PER_LONG)
3171 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3173 /* TODO: should probably account for rx_highest for both HT/VHT */
3174 if (!vht_cap || !vht_cap->vht_supported)
3175 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3177 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3179 lq_sta->max_legacy_rate_idx =
3180 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3181 lq_sta->max_siso_rate_idx =
3182 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3183 lq_sta->max_mimo2_rate_idx =
3184 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3187 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3188 lq_sta->active_legacy_rate,
3189 lq_sta->active_siso_rate,
3190 lq_sta->active_mimo2_rate,
3191 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3192 lq_sta->bfer_capable);
3193 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3194 lq_sta->max_legacy_rate_idx,
3195 lq_sta->max_siso_rate_idx,
3196 lq_sta->max_mimo2_rate_idx);
3198 /* These values will be overridden later */
3199 lq_sta->lq.single_stream_ant_msk =
3200 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3201 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3203 /* as default allow aggregation for all tids */
3204 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3206 #ifdef CONFIG_IWLWIFI_DEBUGFS
3207 iwl_mvm_reset_frame_stats(mvm);
3209 rs_initialize_lq(mvm, sta, lq_sta, band, init);
3212 static void rs_rate_update(void *mvm_r,
3213 struct ieee80211_supported_band *sband,
3214 struct cfg80211_chan_def *chandef,
3215 struct ieee80211_sta *sta, void *priv_sta,
3219 struct iwl_op_mode *op_mode =
3220 (struct iwl_op_mode *)mvm_r;
3221 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
3223 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3226 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3227 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3228 ieee80211_stop_tx_ba_session(sta, tid);
3230 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
3233 #ifdef CONFIG_MAC80211_DEBUGFS
3234 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3235 struct iwl_lq_cmd *lq_cmd,
3236 enum nl80211_band band,
3239 struct rs_rate rate;
3241 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3242 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3243 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3245 for (i = 0; i < num_rates; i++)
3246 lq_cmd->rs_table[i] = ucode_rate_le32;
3248 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
3251 lq_cmd->mimo_delim = num_rates - 1;
3253 lq_cmd->mimo_delim = 0;
3255 lq_cmd->reduced_tpc = 0;
3257 if (num_of_ant(ant) == 1)
3258 lq_cmd->single_stream_ant_msk = ant;
3260 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3262 #endif /* CONFIG_MAC80211_DEBUGFS */
3264 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3265 struct iwl_lq_sta *lq_sta,
3266 struct rs_rate *rate,
3267 __le32 *rs_table, int *rs_table_index,
3268 int num_rates, int num_retries,
3269 u8 valid_tx_ant, bool toggle_ant)
3273 bool bottom_reached = false;
3274 int prev_rate_idx = rate->index;
3275 int end = LINK_QUAL_MAX_RETRY_NUM;
3276 int index = *rs_table_index;
3278 for (i = 0; i < num_rates && index < end; i++) {
3279 for (j = 0; j < num_retries && index < end; j++, index++) {
3280 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3282 rs_table[index] = ucode_rate;
3284 rs_toggle_antenna(valid_tx_ant, rate);
3287 prev_rate_idx = rate->index;
3288 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3289 if (bottom_reached && !is_legacy(rate))
3293 if (!bottom_reached && !is_legacy(rate))
3294 rate->index = prev_rate_idx;
3296 *rs_table_index = index;
3299 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3300 * column the rate table should look like this:
3302 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3303 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3304 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3305 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3306 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3307 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3308 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3309 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3310 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3311 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3312 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3313 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3314 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3315 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3316 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3317 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3319 static void rs_build_rates_table(struct iwl_mvm *mvm,
3320 struct ieee80211_sta *sta,
3321 struct iwl_lq_sta *lq_sta,
3322 const struct rs_rate *initial_rate)
3324 struct rs_rate rate;
3325 int num_rates, num_retries, index = 0;
3326 u8 valid_tx_ant = 0;
3327 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3328 bool toggle_ant = false;
3330 memcpy(&rate, initial_rate, sizeof(rate));
3332 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3334 /* TODO: remove old API when min FW API hits 14 */
3335 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3336 rs_stbc_allow(mvm, sta, lq_sta))
3339 if (is_siso(&rate)) {
3340 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3341 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3342 } else if (is_mimo(&rate)) {
3343 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3344 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3346 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3347 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3351 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3352 num_rates, num_retries, valid_tx_ant,
3355 rs_get_lower_rate_down_column(lq_sta, &rate);
3357 if (is_siso(&rate)) {
3358 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3359 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3360 lq_cmd->mimo_delim = index;
3361 } else if (is_legacy(&rate)) {
3362 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3363 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3370 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3371 num_rates, num_retries, valid_tx_ant,
3374 rs_get_lower_rate_down_column(lq_sta, &rate);
3376 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3377 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3379 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3380 num_rates, num_retries, valid_tx_ant,
3385 struct rs_bfer_active_iter_data {
3386 struct ieee80211_sta *exclude_sta;
3387 struct iwl_mvm_sta *bfer_mvmsta;
3390 static void rs_bfer_active_iter(void *_data,
3391 struct ieee80211_sta *sta)
3393 struct rs_bfer_active_iter_data *data = _data;
3394 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3395 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3396 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3398 if (sta == data->exclude_sta)
3401 /* The current sta has BFER allowed */
3402 if (ss_params & LQ_SS_BFER_ALLOWED) {
3403 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3405 data->bfer_mvmsta = mvmsta;
3409 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3412 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3415 case NL80211_IFTYPE_AP:
3416 case NL80211_IFTYPE_P2P_GO:
3419 case NL80211_IFTYPE_P2P_CLIENT:
3422 case NL80211_IFTYPE_STATION:
3426 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3433 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3434 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3435 struct iwl_mvm_sta *sta2)
3437 int prio1 = rs_bfer_priority(sta1);
3438 int prio2 = rs_bfer_priority(sta2);
3447 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3448 struct ieee80211_sta *sta,
3449 struct iwl_lq_sta *lq_sta,
3450 const struct rs_rate *initial_rate)
3452 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3453 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3454 struct rs_bfer_active_iter_data data = {
3456 .bfer_mvmsta = NULL,
3458 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3459 u32 ss_params = LQ_SS_PARAMS_VALID;
3461 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3464 #ifdef CONFIG_MAC80211_DEBUGFS
3465 /* Check if forcing the decision is configured.
3466 * Note that SISO is forced by not allowing STBC or BFER
3468 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3469 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3470 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3471 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3473 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3474 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3475 lq_sta->pers.ss_force);
3480 if (lq_sta->stbc_capable)
3481 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3483 if (!lq_sta->bfer_capable)
3486 ieee80211_iterate_stations_atomic(mvm->hw,
3487 rs_bfer_active_iter,
3489 bfer_mvmsta = data.bfer_mvmsta;
3491 /* This code is safe as it doesn't run concurrently for different
3492 * stations. This is guaranteed by the fact that calls to
3493 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3496 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3498 ss_params |= LQ_SS_BFER_ALLOWED;
3502 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3503 bfer_mvmsta->sta_id);
3505 /* Disallow BFER on another STA if active and we're a higher priority */
3506 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3507 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3508 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3510 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3511 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3512 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3514 ss_params |= LQ_SS_BFER_ALLOWED;
3516 "Lower priority BFER sta found (%d). Switch BFER\n",
3517 bfer_mvmsta->sta_id);
3520 lq_cmd->ss_params = cpu_to_le32(ss_params);
3523 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3524 struct ieee80211_sta *sta,
3525 struct iwl_lq_sta *lq_sta,
3526 const struct rs_rate *initial_rate)
3528 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3529 struct iwl_mvm_sta *mvmsta;
3530 struct iwl_mvm_vif *mvmvif;
3532 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3533 lq_cmd->agg_time_limit =
3534 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3536 #ifdef CONFIG_MAC80211_DEBUGFS
3537 if (lq_sta->pers.dbg_fixed_rate) {
3538 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3540 lq_sta->pers.dbg_fixed_rate);
3544 if (WARN_ON_ONCE(!sta || !initial_rate))
3547 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3549 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3550 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3552 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3553 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3555 if (num_of_ant(initial_rate->ant) == 1)
3556 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3558 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3561 * In case of low latency, tell the firmware to leave a frame in the
3562 * Tx Fifo so that it can start a transaction in the same TxOP. This
3563 * basically allows the firmware to send bursts.
3565 if (iwl_mvm_vif_low_latency(mvmvif))
3566 lq_cmd->agg_frame_cnt_limit--;
3568 if (mvmsta->vif->p2p)
3569 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3571 lq_cmd->agg_time_limit =
3572 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3575 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3579 /* rate scale requires free function to be implemented */
3580 static void rs_free(void *mvm_rate)
3585 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3588 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3589 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3591 IWL_DEBUG_RATE(mvm, "enter\n");
3592 IWL_DEBUG_RATE(mvm, "leave\n");
3595 #ifdef CONFIG_MAC80211_DEBUGFS
3596 int rs_pretty_print_rate(char *buf, const u32 rate)
3600 u8 mcs = 0, nss = 0;
3601 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3603 if (!(rate & RATE_MCS_HT_MSK) &&
3604 !(rate & RATE_MCS_VHT_MSK)) {
3605 int index = iwl_hwrate_to_plcp_idx(rate);
3607 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3609 index == IWL_RATE_INVALID ? "BAD" :
3610 iwl_rate_mcs[index].mbps);
3613 if (rate & RATE_MCS_VHT_MSK) {
3615 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3616 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3617 >> RATE_VHT_MCS_NSS_POS) + 1;
3618 } else if (rate & RATE_MCS_HT_MSK) {
3620 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3621 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3622 >> RATE_HT_MCS_NSS_POS) + 1;
3624 type = "Unknown"; /* shouldn't happen */
3627 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3628 case RATE_MCS_CHAN_WIDTH_20:
3631 case RATE_MCS_CHAN_WIDTH_40:
3634 case RATE_MCS_CHAN_WIDTH_80:
3637 case RATE_MCS_CHAN_WIDTH_160:
3644 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3645 type, rs_pretty_ant(ant), bw, mcs, nss,
3646 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3647 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3648 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3649 (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3653 * Program the device to use fixed rate for frame transmit
3654 * This is for debugging/testing only
3655 * once the device start use fixed rate, we need to reload the module
3656 * to being back the normal operation.
3658 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3659 struct iwl_lq_sta *lq_sta)
3661 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3662 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3663 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3665 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3666 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3668 if (lq_sta->pers.dbg_fixed_rate) {
3669 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3670 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3674 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3675 const char __user *user_buf, size_t count, loff_t *ppos)
3677 struct iwl_lq_sta *lq_sta = file->private_data;
3678 struct iwl_mvm *mvm;
3683 mvm = lq_sta->pers.drv;
3684 memset(buf, 0, sizeof(buf));
3685 buf_size = min(count, sizeof(buf) - 1);
3686 if (copy_from_user(buf, user_buf, buf_size))
3689 if (sscanf(buf, "%x", &parsed_rate) == 1)
3690 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3692 lq_sta->pers.dbg_fixed_rate = 0;
3694 rs_program_fix_rate(mvm, lq_sta);
3699 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3700 char __user *user_buf, size_t count, loff_t *ppos)
3707 struct iwl_lq_sta *lq_sta = file->private_data;
3708 struct iwl_mvm_sta *mvmsta =
3709 container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3710 struct iwl_mvm *mvm;
3711 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3712 struct rs_rate *rate = &tbl->rate;
3715 mvm = lq_sta->pers.drv;
3716 buff = kmalloc(2048, GFP_KERNEL);
3720 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3721 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3722 lq_sta->total_failed, lq_sta->total_success,
3723 lq_sta->active_legacy_rate);
3724 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3725 lq_sta->pers.dbg_fixed_rate);
3726 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3727 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3728 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3729 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3730 desc += sprintf(buff+desc, "lq type %s\n",
3731 (is_legacy(rate)) ? "legacy" :
3732 is_vht(rate) ? "VHT" : "HT");
3733 if (!is_legacy(rate)) {
3734 desc += sprintf(buff + desc, " %s",
3735 (is_siso(rate)) ? "SISO" : "MIMO2");
3736 desc += sprintf(buff + desc, " %s",
3737 (is_ht20(rate)) ? "20MHz" :
3738 (is_ht40(rate)) ? "40MHz" :
3739 (is_ht80(rate)) ? "80MHz" :
3740 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3741 desc += sprintf(buff + desc, " %s %s %s %s\n",
3742 (rate->sgi) ? "SGI" : "NGI",
3743 (rate->ldpc) ? "LDPC" : "BCC",
3744 (lq_sta->is_agg) ? "AGG on" : "",
3745 (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
3747 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3748 lq_sta->last_rate_n_flags);
3749 desc += sprintf(buff+desc,
3750 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3752 lq_sta->lq.mimo_delim,
3753 lq_sta->lq.single_stream_ant_msk,
3754 lq_sta->lq.dual_stream_ant_msk);
3756 desc += sprintf(buff+desc,
3757 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3758 le16_to_cpu(lq_sta->lq.agg_time_limit),
3759 lq_sta->lq.agg_disable_start_th,
3760 lq_sta->lq.agg_frame_cnt_limit);
3762 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3763 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3764 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3765 (ss_params & LQ_SS_PARAMS_VALID) ?
3766 "VALID" : "INVALID",
3767 (ss_params & LQ_SS_BFER_ALLOWED) ?
3769 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3771 (ss_params & LQ_SS_FORCE) ?
3773 desc += sprintf(buff+desc,
3774 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3775 lq_sta->lq.initial_rate_index[0],
3776 lq_sta->lq.initial_rate_index[1],
3777 lq_sta->lq.initial_rate_index[2],
3778 lq_sta->lq.initial_rate_index[3]);
3780 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3781 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3783 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3784 desc += rs_pretty_print_rate(buff+desc, r);
3787 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3792 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3793 .write = rs_sta_dbgfs_scale_table_write,
3794 .read = rs_sta_dbgfs_scale_table_read,
3795 .open = simple_open,
3796 .llseek = default_llseek,
3798 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3799 char __user *user_buf, size_t count, loff_t *ppos)
3805 struct iwl_scale_tbl_info *tbl;
3806 struct rs_rate *rate;
3807 struct iwl_lq_sta *lq_sta = file->private_data;
3809 buff = kmalloc(1024, GFP_KERNEL);
3813 for (i = 0; i < LQ_SIZE; i++) {
3814 tbl = &(lq_sta->lq_info[i]);
3816 desc += sprintf(buff+desc,
3817 "%s type=%d SGI=%d BW=%s DUP=0\n"
3819 lq_sta->active_tbl == i ? "*" : "x",
3822 is_ht20(rate) ? "20MHz" :
3823 is_ht40(rate) ? "40MHz" :
3824 is_ht80(rate) ? "80MHz" :
3825 is_ht160(rate) ? "160MHz" : "ERR",
3827 for (j = 0; j < IWL_RATE_COUNT; j++) {
3828 desc += sprintf(buff+desc,
3829 "counter=%d success=%d %%=%d\n",
3830 tbl->win[j].counter,
3831 tbl->win[j].success_counter,
3832 tbl->win[j].success_ratio);
3835 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3840 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3841 .read = rs_sta_dbgfs_stats_table_read,
3842 .open = simple_open,
3843 .llseek = default_llseek,
3846 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3847 char __user *user_buf,
3848 size_t count, loff_t *ppos)
3850 static const char * const column_name[] = {
3851 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3852 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3853 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3854 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3855 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3856 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3857 [RS_COLUMN_MIMO2] = "MIMO2",
3858 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3861 static const char * const rate_name[] = {
3862 [IWL_RATE_1M_INDEX] = "1M",
3863 [IWL_RATE_2M_INDEX] = "2M",
3864 [IWL_RATE_5M_INDEX] = "5.5M",
3865 [IWL_RATE_11M_INDEX] = "11M",
3866 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3867 [IWL_RATE_9M_INDEX] = "9M",
3868 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3869 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3870 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3871 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3872 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3873 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3874 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3875 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3876 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3879 char *buff, *pos, *endpos;
3882 struct iwl_lq_sta *lq_sta = file->private_data;
3883 struct rs_rate_stats *stats;
3884 static const size_t bufsz = 1024;
3886 buff = kmalloc(bufsz, GFP_KERNEL);
3891 endpos = pos + bufsz;
3893 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3894 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3895 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3896 pos += scnprintf(pos, endpos - pos, "\n");
3898 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3899 pos += scnprintf(pos, endpos - pos,
3900 "%s,", column_name[col]);
3902 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3903 stats = &(lq_sta->pers.tx_stats[col][rate]);
3904 pos += scnprintf(pos, endpos - pos,
3909 pos += scnprintf(pos, endpos - pos, "\n");
3912 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3917 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3918 const char __user *user_buf,
3919 size_t count, loff_t *ppos)
3921 struct iwl_lq_sta *lq_sta = file->private_data;
3922 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3927 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3928 .read = rs_sta_dbgfs_drv_tx_stats_read,
3929 .write = rs_sta_dbgfs_drv_tx_stats_write,
3930 .open = simple_open,
3931 .llseek = default_llseek,
3934 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3935 char __user *user_buf,
3936 size_t count, loff_t *ppos)
3938 struct iwl_lq_sta *lq_sta = file->private_data;
3940 int bufsz = sizeof(buf);
3942 static const char * const ss_force_name[] = {
3943 [RS_SS_FORCE_NONE] = "none",
3944 [RS_SS_FORCE_STBC] = "stbc",
3945 [RS_SS_FORCE_BFER] = "bfer",
3946 [RS_SS_FORCE_SISO] = "siso",
3949 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3950 ss_force_name[lq_sta->pers.ss_force]);
3951 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3954 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3955 size_t count, loff_t *ppos)
3957 struct iwl_mvm *mvm = lq_sta->pers.drv;
3960 if (!strncmp("none", buf, 4)) {
3961 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3962 } else if (!strncmp("siso", buf, 4)) {
3963 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3964 } else if (!strncmp("stbc", buf, 4)) {
3965 if (lq_sta->stbc_capable) {
3966 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3969 "can't force STBC. peer doesn't support\n");
3972 } else if (!strncmp("bfer", buf, 4)) {
3973 if (lq_sta->bfer_capable) {
3974 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3977 "can't force BFER. peer doesn't support\n");
3981 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3984 return ret ?: count;
3987 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3988 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3989 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3990 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3991 &iwl_dbgfs_##name##_ops)) \
3995 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3997 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3999 struct iwl_lq_sta *lq_sta = priv_sta;
4000 struct iwl_mvm_sta *mvmsta;
4002 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
4007 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
4008 lq_sta, &rs_sta_dbgfs_scale_table_ops);
4009 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
4010 lq_sta, &rs_sta_dbgfs_stats_table_ops);
4011 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
4012 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4013 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
4014 &lq_sta->tx_agg_tid_en);
4015 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
4016 &lq_sta->pers.dbg_fixed_txp_reduction);
4018 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
4021 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4024 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
4030 * Initialization of rate scaling information is done by driver after
4031 * the station is added. Since mac80211 calls this function before a
4032 * station is added we ignore it.
4034 static void rs_rate_init_stub(void *mvm_r,
4035 struct ieee80211_supported_band *sband,
4036 struct cfg80211_chan_def *chandef,
4037 struct ieee80211_sta *sta, void *mvm_sta)
4041 static const struct rate_control_ops rs_mvm_ops = {
4043 .tx_status = rs_mac80211_tx_status,
4044 .get_rate = rs_get_rate,
4045 .rate_init = rs_rate_init_stub,
4048 .alloc_sta = rs_alloc_sta,
4049 .free_sta = rs_free_sta,
4050 .rate_update = rs_rate_update,
4051 #ifdef CONFIG_MAC80211_DEBUGFS
4052 .add_sta_debugfs = rs_add_debugfs,
4053 .remove_sta_debugfs = rs_remove_debugfs,
4057 int iwl_mvm_rate_control_register(void)
4059 return ieee80211_rate_control_register(&rs_mvm_ops);
4062 void iwl_mvm_rate_control_unregister(void)
4064 ieee80211_rate_control_unregister(&rs_mvm_ops);
4068 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
4069 * Tx protection, according to this request and previous requests,
4070 * and send the LQ command.
4071 * @mvmsta: The station
4072 * @enable: Enable Tx protection?
4074 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4077 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
4079 lockdep_assert_held(&mvm->mutex);
4082 if (mvmsta->tx_protection == 0)
4083 lq->flags |= LQ_FLAG_USE_RTS_MSK;
4084 mvmsta->tx_protection++;
4086 mvmsta->tx_protection--;
4087 if (mvmsta->tx_protection == 0)
4088 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4091 return iwl_mvm_send_lq_cmd(mvm, lq, false);