1 /******************************************************************************
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
19 * The full GNU General Public License is included in this distribution in the
20 * file called LICENSE.
22 * Contact Information:
23 * Intel Linux Wireless <ilw@linux.intel.com>
24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26 *****************************************************************************/
27 #include <linux/kernel.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
36 #include <linux/workqueue.h>
40 #include "iwl-op-mode.h"
44 #define RS_NAME "iwl-mvm-rs"
46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
49 * Use this macro when dealing with thresholds consts set as a percentage
51 #define RS_PERCENT(x) (128 * x)
53 static u8 rs_ht_to_legacy[] = {
54 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
55 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
56 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
57 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
58 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
59 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
60 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
61 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
63 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
66 static const u8 ant_toggle_lookup[] = {
67 [ANT_NONE] = ANT_NONE,
77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
83 IWL_RATE_##rp##M_INDEX, \
84 IWL_RATE_##rn##M_INDEX }
86 #define IWL_DECLARE_MCS_RATE(s) \
87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_INVM_INDEX, \
97 * rate, ht rate, prev rate, next rate
99 * If there isn't a valid next or previous rate then INV is used which
100 * maps to IWL_RATE_INVALID
103 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
104 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
105 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
106 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
107 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
109 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
123 RS_ACTION_DOWNSCALE = -1,
124 RS_ACTION_UPSCALE = 1,
127 enum rs_column_mode {
134 #define MAX_NEXT_COLUMNS 7
135 #define MAX_COLUMN_CHECKS 3
139 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
140 struct ieee80211_sta *sta,
141 struct iwl_scale_tbl_info *tbl,
142 const struct rs_tx_column *next_col);
144 struct rs_tx_column {
145 enum rs_column_mode mode;
148 enum rs_column next_columns[MAX_NEXT_COLUMNS];
149 allow_column_func_t checks[MAX_COLUMN_CHECKS];
152 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
153 struct iwl_scale_tbl_info *tbl,
154 const struct rs_tx_column *next_col)
156 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
159 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
160 struct iwl_scale_tbl_info *tbl,
161 const struct rs_tx_column *next_col)
163 struct iwl_mvm_sta *mvmsta;
164 struct iwl_mvm_vif *mvmvif;
166 if (!sta->ht_cap.ht_supported)
169 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
172 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
175 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
178 mvmsta = iwl_mvm_sta_from_mac80211(sta);
179 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
180 if (iwl_mvm_vif_low_latency(mvmvif) && mvmsta->vif->p2p)
186 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
187 struct iwl_scale_tbl_info *tbl,
188 const struct rs_tx_column *next_col)
190 if (!sta->ht_cap.ht_supported)
196 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
197 struct iwl_scale_tbl_info *tbl,
198 const struct rs_tx_column *next_col)
200 struct rs_rate *rate = &tbl->rate;
201 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
202 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
204 if (is_ht20(rate) && (ht_cap->cap &
205 IEEE80211_HT_CAP_SGI_20))
207 if (is_ht40(rate) && (ht_cap->cap &
208 IEEE80211_HT_CAP_SGI_40))
210 if (is_ht80(rate) && (vht_cap->cap &
211 IEEE80211_VHT_CAP_SHORT_GI_80))
217 static const struct rs_tx_column rs_tx_columns[] = {
218 [RS_COLUMN_LEGACY_ANT_A] = {
222 RS_COLUMN_LEGACY_ANT_B,
223 RS_COLUMN_SISO_ANT_A,
234 [RS_COLUMN_LEGACY_ANT_B] = {
238 RS_COLUMN_LEGACY_ANT_A,
239 RS_COLUMN_SISO_ANT_B,
250 [RS_COLUMN_SISO_ANT_A] = {
254 RS_COLUMN_SISO_ANT_B,
256 RS_COLUMN_SISO_ANT_A_SGI,
257 RS_COLUMN_LEGACY_ANT_A,
258 RS_COLUMN_LEGACY_ANT_B,
267 [RS_COLUMN_SISO_ANT_B] = {
271 RS_COLUMN_SISO_ANT_A,
273 RS_COLUMN_SISO_ANT_B_SGI,
274 RS_COLUMN_LEGACY_ANT_A,
275 RS_COLUMN_LEGACY_ANT_B,
284 [RS_COLUMN_SISO_ANT_A_SGI] = {
289 RS_COLUMN_SISO_ANT_B_SGI,
291 RS_COLUMN_SISO_ANT_A,
292 RS_COLUMN_LEGACY_ANT_A,
293 RS_COLUMN_LEGACY_ANT_B,
303 [RS_COLUMN_SISO_ANT_B_SGI] = {
308 RS_COLUMN_SISO_ANT_A_SGI,
310 RS_COLUMN_SISO_ANT_B,
311 RS_COLUMN_LEGACY_ANT_A,
312 RS_COLUMN_LEGACY_ANT_B,
322 [RS_COLUMN_MIMO2] = {
326 RS_COLUMN_SISO_ANT_A,
328 RS_COLUMN_LEGACY_ANT_A,
329 RS_COLUMN_LEGACY_ANT_B,
338 [RS_COLUMN_MIMO2_SGI] = {
343 RS_COLUMN_SISO_ANT_A_SGI,
345 RS_COLUMN_LEGACY_ANT_A,
346 RS_COLUMN_LEGACY_ANT_B,
358 static inline u8 rs_extract_rate(u32 rate_n_flags)
360 /* also works for HT because bits 7:6 are zero there */
361 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
368 if (rate_n_flags & RATE_MCS_HT_MSK) {
369 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
370 idx += IWL_RATE_MCS_0_INDEX;
372 /* skip 9M not supported in HT*/
373 if (idx >= IWL_RATE_9M_INDEX)
375 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
377 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
378 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
379 idx += IWL_RATE_MCS_0_INDEX;
381 /* skip 9M not supported in VHT*/
382 if (idx >= IWL_RATE_9M_INDEX)
384 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
387 /* legacy rate format, search for match in table */
389 u8 legacy_rate = rs_extract_rate(rate_n_flags);
390 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
391 if (iwl_rates[idx].plcp == legacy_rate)
395 return IWL_RATE_INVALID;
398 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
399 struct ieee80211_sta *sta,
400 struct iwl_lq_sta *lq_sta,
402 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
403 struct ieee80211_sta *sta,
404 struct iwl_lq_sta *lq_sta,
405 const struct rs_rate *initial_rate);
406 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
409 * The following tables contain the expected throughput metrics for all rates
411 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
413 * where invalid entries are zeros.
415 * CCK rates are only valid in legacy table and will only be used in G
419 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
420 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
423 /* Expected TpT tables. 4 indexes:
424 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
426 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
427 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
428 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
429 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
430 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
433 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
434 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
435 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
436 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
437 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
440 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
441 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
442 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
443 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
444 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
448 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
449 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
450 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
451 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
455 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
456 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
457 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
458 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
462 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
463 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
464 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
465 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
469 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
478 { "24", "16QAM 1/2"},
479 { "36", "16QAM 3/4"},
480 { "48", "64QAM 2/3"},
481 { "54", "64QAM 3/4"},
482 { "60", "64QAM 5/6"},
485 #define MCS_INDEX_PER_STREAM (8)
487 static const char *rs_pretty_ant(u8 ant)
489 static const char * const ant_name[] = {
503 return ant_name[ant];
506 static const char *rs_pretty_lq_type(enum iwl_table_type type)
508 static const char * const lq_types[] = {
510 [LQ_LEGACY_A] = "LEGACY_A",
511 [LQ_LEGACY_G] = "LEGACY_G",
512 [LQ_HT_SISO] = "HT SISO",
513 [LQ_HT_MIMO2] = "HT MIMO",
514 [LQ_VHT_SISO] = "VHT SISO",
515 [LQ_VHT_MIMO2] = "VHT MIMO",
518 if (type < LQ_NONE || type >= LQ_MAX)
521 return lq_types[type];
524 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
528 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
529 prefix, rs_pretty_lq_type(rate->type),
530 rate->index, rs_pretty_ant(rate->ant),
531 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
534 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
537 window->success_counter = 0;
538 window->success_ratio = IWL_INVALID_VALUE;
540 window->average_tpt = IWL_INVALID_VALUE;
543 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
544 struct iwl_scale_tbl_info *tbl)
548 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
549 for (i = 0; i < IWL_RATE_COUNT; i++)
550 rs_rate_scale_clear_window(&tbl->win[i]);
552 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
553 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
556 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
558 return (ant_type & valid_antenna) == ant_type;
561 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
562 struct iwl_lq_sta *lq_data, u8 tid,
563 struct ieee80211_sta *sta)
567 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
569 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
570 if (ret == -EAGAIN) {
572 * driver and mac80211 is out of sync
573 * this might be cause by reloading firmware
574 * stop the tx ba session here
576 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
578 ieee80211_stop_tx_ba_session(sta, tid);
583 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
584 struct iwl_lq_sta *lq_data,
585 struct ieee80211_sta *sta)
587 if (tid < IWL_MAX_TID_COUNT)
588 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
590 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
591 tid, IWL_MAX_TID_COUNT);
594 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
596 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
597 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
598 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
602 * Static function to get the expected throughput from an iwl_scale_tbl_info
603 * that wraps a NULL pointer check
605 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
607 if (tbl->expected_tpt)
608 return tbl->expected_tpt[rs_index];
613 * rs_collect_tx_data - Update the success/failure sliding window
615 * We keep a sliding window of the last 62 packets transmitted
616 * at this rate. window->data contains the bitmask of successful
619 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
620 struct iwl_scale_tbl_info *tbl,
621 int scale_index, int attempts, int successes,
622 struct iwl_rate_scale_data *window)
624 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
627 /* Get expected throughput */
628 tpt = get_expected_tpt(tbl, scale_index);
631 * Keep track of only the latest 62 tx frame attempts in this rate's
632 * history window; anything older isn't really relevant any more.
633 * If we have filled up the sliding window, drop the oldest attempt;
634 * if the oldest attempt (highest bit in bitmap) shows "success",
635 * subtract "1" from the success counter (this is the main reason
636 * we keep these bitmaps!).
638 while (attempts > 0) {
639 if (window->counter >= IWL_RATE_MAX_WINDOW) {
640 /* remove earliest */
641 window->counter = IWL_RATE_MAX_WINDOW - 1;
643 if (window->data & mask) {
644 window->data &= ~mask;
645 window->success_counter--;
649 /* Increment frames-attempted counter */
652 /* Shift bitmap by one frame to throw away oldest history */
655 /* Mark the most recent #successes attempts as successful */
657 window->success_counter++;
665 /* Calculate current success ratio, avoid divide-by-0! */
666 if (window->counter > 0)
667 window->success_ratio = 128 * (100 * window->success_counter)
670 window->success_ratio = IWL_INVALID_VALUE;
672 fail_count = window->counter - window->success_counter;
674 /* Calculate average throughput, if we have enough history. */
675 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
676 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
677 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
679 window->average_tpt = IWL_INVALID_VALUE;
684 static int rs_collect_tx_data(struct iwl_mvm *mvm,
685 struct iwl_lq_sta *lq_sta,
686 struct iwl_scale_tbl_info *tbl,
687 int scale_index, int attempts, int successes,
690 struct iwl_rate_scale_data *window = NULL;
693 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
696 if (tbl->column != RS_COLUMN_INVALID) {
697 struct lq_sta_pers *pers = &lq_sta->pers;
699 pers->tx_stats[tbl->column][scale_index].total += attempts;
700 pers->tx_stats[tbl->column][scale_index].success += successes;
703 /* Select window for current tx bit rate */
704 window = &(tbl->win[scale_index]);
706 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
711 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
714 window = &tbl->tpc_win[reduced_txp];
715 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
719 /* Convert rs_rate object into ucode rate bitmask */
720 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
721 struct rs_rate *rate)
724 int index = rate->index;
726 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
727 RATE_MCS_ANT_ABC_MSK);
729 if (is_legacy(rate)) {
730 ucode_rate |= iwl_rates[index].plcp;
731 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
732 ucode_rate |= RATE_MCS_CCK_MSK;
737 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
738 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
739 index = IWL_LAST_HT_RATE;
741 ucode_rate |= RATE_MCS_HT_MSK;
743 if (is_ht_siso(rate))
744 ucode_rate |= iwl_rates[index].plcp_ht_siso;
745 else if (is_ht_mimo2(rate))
746 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
749 } else if (is_vht(rate)) {
750 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
751 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
752 index = IWL_LAST_VHT_RATE;
754 ucode_rate |= RATE_MCS_VHT_MSK;
755 if (is_vht_siso(rate))
756 ucode_rate |= iwl_rates[index].plcp_vht_siso;
757 else if (is_vht_mimo2(rate))
758 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
763 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
766 if (is_siso(rate) && rate->stbc) {
767 /* To enable STBC we need to set both a flag and ANT_AB */
768 ucode_rate |= RATE_MCS_ANT_AB_MSK;
769 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
772 ucode_rate |= rate->bw;
774 ucode_rate |= RATE_MCS_SGI_MSK;
776 ucode_rate |= RATE_MCS_LDPC_MSK;
781 /* Convert a ucode rate into an rs_rate object */
782 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
783 enum ieee80211_band band,
784 struct rs_rate *rate)
786 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
787 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
790 memset(rate, 0, sizeof(*rate));
791 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
793 if (rate->index == IWL_RATE_INVALID)
796 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
799 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
800 !(ucode_rate & RATE_MCS_VHT_MSK)) {
801 if (num_of_ant == 1) {
802 if (band == IEEE80211_BAND_5GHZ)
803 rate->type = LQ_LEGACY_A;
805 rate->type = LQ_LEGACY_G;
812 if (ucode_rate & RATE_MCS_SGI_MSK)
814 if (ucode_rate & RATE_MCS_LDPC_MSK)
816 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
818 if (ucode_rate & RATE_MCS_BF_MSK)
821 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
823 if (ucode_rate & RATE_MCS_HT_MSK) {
824 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
825 RATE_HT_MCS_NSS_POS) + 1;
828 rate->type = LQ_HT_SISO;
829 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
831 rate->stbc, rate->bfer);
832 } else if (nss == 2) {
833 rate->type = LQ_HT_MIMO2;
834 WARN_ON_ONCE(num_of_ant != 2);
838 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
839 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
840 RATE_VHT_MCS_NSS_POS) + 1;
843 rate->type = LQ_VHT_SISO;
844 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
846 rate->stbc, rate->bfer);
847 } else if (nss == 2) {
848 rate->type = LQ_VHT_MIMO2;
849 WARN_ON_ONCE(num_of_ant != 2);
855 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
856 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
862 /* switch to another antenna/antennas and return 1 */
863 /* if no other valid antenna found, return 0 */
864 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
868 if (!rate->ant || rate->ant > ANT_ABC)
871 if (!rs_is_valid_ant(valid_ant, rate->ant))
874 new_ant_type = ant_toggle_lookup[rate->ant];
876 while ((new_ant_type != rate->ant) &&
877 !rs_is_valid_ant(valid_ant, new_ant_type))
878 new_ant_type = ant_toggle_lookup[new_ant_type];
880 if (new_ant_type == rate->ant)
883 rate->ant = new_ant_type;
888 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
889 struct rs_rate *rate)
892 return lq_sta->active_legacy_rate;
893 else if (is_siso(rate))
894 return lq_sta->active_siso_rate;
895 else if (is_mimo2(rate))
896 return lq_sta->active_mimo2_rate;
902 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
905 u8 high = IWL_RATE_INVALID;
906 u8 low = IWL_RATE_INVALID;
908 /* 802.11A or ht walks to the next literal adjacent rate in
910 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
914 /* Find the previous rate that is in the rate mask */
916 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
917 if (rate_mask & mask) {
923 /* Find the next rate that is in the rate mask */
925 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
926 if (rate_mask & mask) {
932 return (high << 8) | low;
936 while (low != IWL_RATE_INVALID) {
937 low = iwl_rates[low].prev_rs;
938 if (low == IWL_RATE_INVALID)
940 if (rate_mask & (1 << low))
945 while (high != IWL_RATE_INVALID) {
946 high = iwl_rates[high].next_rs;
947 if (high == IWL_RATE_INVALID)
949 if (rate_mask & (1 << high))
953 return (high << 8) | low;
956 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
957 struct rs_rate *rate)
959 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
962 /* Get the next supported lower rate in the current column.
963 * Return true if bottom rate in the current column was reached
965 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
966 struct rs_rate *rate)
971 struct iwl_mvm *mvm = lq_sta->pers.drv;
973 rate_mask = rs_get_supported_rates(lq_sta, rate);
974 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
976 low = high_low & 0xff;
978 /* Bottom rate of column reached */
979 if (low == IWL_RATE_INVALID)
986 /* Get the next rate to use following a column downgrade */
987 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
988 struct rs_rate *rate)
990 struct iwl_mvm *mvm = lq_sta->pers.drv;
992 if (is_legacy(rate)) {
993 /* No column to downgrade from Legacy */
995 } else if (is_siso(rate)) {
996 /* Downgrade to Legacy if we were in SISO */
997 if (lq_sta->band == IEEE80211_BAND_5GHZ)
998 rate->type = LQ_LEGACY_A;
1000 rate->type = LQ_LEGACY_G;
1002 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1004 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1005 rate->index > IWL_RATE_MCS_9_INDEX);
1007 rate->index = rs_ht_to_legacy[rate->index];
1010 /* Downgrade to SISO with same MCS if in MIMO */
1011 rate->type = is_vht_mimo2(rate) ?
1012 LQ_VHT_SISO : LQ_HT_SISO;
1015 if (num_of_ant(rate->ant) > 1)
1016 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1018 /* Relevant in both switching to SISO or Legacy */
1021 if (!rs_rate_supported(lq_sta, rate))
1022 rs_get_lower_rate_in_column(lq_sta, rate);
1025 /* Check if both rates are identical
1026 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1027 * with a rate indicating STBC/BFER and ANT_AB.
1029 static inline bool rs_rate_equal(struct rs_rate *a,
1031 bool allow_ant_mismatch)
1034 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) &&
1035 (a->bfer == b->bfer);
1037 if (allow_ant_mismatch) {
1038 if (a->stbc || a->bfer) {
1039 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d",
1040 a->stbc, a->bfer, a->ant);
1041 ant_match |= (b->ant == ANT_A || b->ant == ANT_B);
1042 } else if (b->stbc || b->bfer) {
1043 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d",
1044 b->stbc, b->bfer, b->ant);
1045 ant_match |= (a->ant == ANT_A || a->ant == ANT_B);
1049 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) &&
1050 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match;
1053 /* Check if both rates share the same column */
1054 static inline bool rs_rate_column_match(struct rs_rate *a,
1059 if (a->stbc || a->bfer)
1060 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1062 ant_match = (a->ant == b->ant);
1064 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1068 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1070 if (is_legacy(rate)) {
1071 if (rate->ant == ANT_A)
1072 return RS_COLUMN_LEGACY_ANT_A;
1074 if (rate->ant == ANT_B)
1075 return RS_COLUMN_LEGACY_ANT_B;
1080 if (is_siso(rate)) {
1081 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1082 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1083 RS_COLUMN_SISO_ANT_A;
1085 if (rate->ant == ANT_B)
1086 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1087 RS_COLUMN_SISO_ANT_B;
1093 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1096 return RS_COLUMN_INVALID;
1099 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1101 u8 tid = IWL_MAX_TID_COUNT;
1103 if (ieee80211_is_data_qos(hdr->frame_control)) {
1104 u8 *qc = ieee80211_get_qos_ctl(hdr);
1108 if (unlikely(tid > IWL_MAX_TID_COUNT))
1109 tid = IWL_MAX_TID_COUNT;
1114 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1115 int tid, struct ieee80211_tx_info *info)
1120 struct iwl_lq_cmd *table;
1122 struct rs_rate lq_rate, tx_resp_rate;
1123 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1124 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1125 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1126 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1127 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1128 bool allow_ant_mismatch = mvm->fw->ucode_capa.api[0] &
1129 IWL_UCODE_TLV_API_LQ_SS_PARAMS;
1131 /* Treat uninitialized rate scaling data same as non-existing. */
1133 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1135 } else if (!lq_sta->pers.drv) {
1136 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1140 /* This packet was aggregated but doesn't carry status info */
1141 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1142 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1145 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate);
1147 #ifdef CONFIG_MAC80211_DEBUGFS
1148 /* Disable last tx check if we are debugging with fixed rate but
1149 * update tx stats */
1150 if (lq_sta->pers.dbg_fixed_rate) {
1151 int index = tx_resp_rate.index;
1152 enum rs_column column;
1153 int attempts, success;
1155 column = rs_get_column_from_rate(&tx_resp_rate);
1156 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1157 "Can't map rate 0x%x to column",
1161 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1162 attempts = info->status.ampdu_len;
1163 success = info->status.ampdu_ack_len;
1165 attempts = info->status.rates[0].count;
1166 success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1169 lq_sta->pers.tx_stats[column][index].total += attempts;
1170 lq_sta->pers.tx_stats[column][index].success += success;
1172 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1173 tx_resp_hwrate, success, attempts);
1178 if (time_after(jiffies,
1179 (unsigned long)(lq_sta->last_tx +
1180 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1183 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1184 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1185 ieee80211_stop_tx_ba_session(sta, t);
1187 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1190 lq_sta->last_tx = jiffies;
1192 /* Ignore this Tx frame response if its initial rate doesn't match
1193 * that of latest Link Quality command. There may be stragglers
1194 * from a previous Link Quality command, but we're no longer interested
1195 * in those; they're either from the "active" mode while we're trying
1196 * to check "search" mode, or a prior "search" mode after we've moved
1197 * to a new "search" mode (which might become the new "active" mode).
1199 table = &lq_sta->lq;
1200 lq_hwrate = le32_to_cpu(table->rs_table[0]);
1201 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate);
1203 /* Here we actually compare this rate to the latest LQ command */
1204 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) {
1206 "initial tx resp rate 0x%x does not match 0x%x\n",
1207 tx_resp_hwrate, lq_hwrate);
1210 * Since rates mis-match, the last LQ command may have failed.
1211 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1214 lq_sta->missed_rate_counter++;
1215 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1216 lq_sta->missed_rate_counter = 0;
1218 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1220 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1222 /* Regardless, ignore this status info for outdated rate */
1225 /* Rate did match, so reset the missed_rate_counter */
1226 lq_sta->missed_rate_counter = 0;
1228 if (!lq_sta->search_better_tbl) {
1229 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1230 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1232 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1233 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1236 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1238 "Neither active nor search matches tx rate\n");
1239 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1240 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1241 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1242 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1243 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1246 * no matching table found, let's by-pass the data collection
1247 * and continue to perform rate scale to find the rate table
1249 rs_stay_in_table(lq_sta, true);
1254 * Updating the frame history depends on whether packets were
1257 * For aggregation, all packets were transmitted at the same rate, the
1258 * first index into rate scale table.
1260 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1261 /* ampdu_ack_len = 0 marks no BA was received. In this case
1262 * treat it as a single frame loss as we don't want the success
1263 * ratio to dip too quickly because a BA wasn't received
1265 if (info->status.ampdu_ack_len == 0)
1266 info->status.ampdu_len = 1;
1268 rs_collect_tx_data(mvm, lq_sta, curr_tbl, lq_rate.index,
1269 info->status.ampdu_len,
1270 info->status.ampdu_ack_len,
1273 /* Update success/fail counts if not searching for new mode */
1274 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1275 lq_sta->total_success += info->status.ampdu_ack_len;
1276 lq_sta->total_failed += (info->status.ampdu_len -
1277 info->status.ampdu_ack_len);
1280 /* For legacy, update frame history with for each Tx retry. */
1281 retries = info->status.rates[0].count - 1;
1282 /* HW doesn't send more than 15 retries */
1283 retries = min(retries, 15);
1285 /* The last transmission may have been successful */
1286 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1287 /* Collect data for each rate used during failed TX attempts */
1288 for (i = 0; i <= retries; ++i) {
1289 lq_hwrate = le32_to_cpu(table->rs_table[i]);
1290 rs_rate_from_ucode_rate(lq_hwrate, info->band,
1293 * Only collect stats if retried rate is in the same RS
1294 * table as active/search.
1296 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1298 else if (rs_rate_column_match(&lq_rate,
1300 tmp_tbl = other_tbl;
1304 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, lq_rate.index,
1305 1, i < retries ? 0 : legacy_success,
1309 /* Update success/fail counts if not searching for new mode */
1310 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1311 lq_sta->total_success += legacy_success;
1312 lq_sta->total_failed += retries + (1 - legacy_success);
1315 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1316 lq_sta->last_rate_n_flags = lq_hwrate;
1317 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1319 /* See if there's a better rate or modulation mode to try. */
1320 if (sta->supp_rates[info->band])
1321 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1325 * mac80211 sends us Tx status
1327 static void rs_mac80211_tx_status(void *mvm_r,
1328 struct ieee80211_supported_band *sband,
1329 struct ieee80211_sta *sta, void *priv_sta,
1330 struct sk_buff *skb)
1332 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1333 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1334 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1335 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1337 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1340 if (!ieee80211_is_data(hdr->frame_control) ||
1341 info->flags & IEEE80211_TX_CTL_NO_ACK)
1344 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1348 * Begin a period of staying with a selected modulation mode.
1349 * Set "stay_in_tbl" flag to prevent any mode switches.
1350 * Set frame tx success limits according to legacy vs. high-throughput,
1351 * and reset overall (spanning all rates) tx success history statistics.
1352 * These control how long we stay using same modulation mode before
1353 * searching for a new mode.
1355 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1356 struct iwl_lq_sta *lq_sta)
1358 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1359 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1361 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1362 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1363 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1365 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1366 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1367 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1369 lq_sta->table_count = 0;
1370 lq_sta->total_failed = 0;
1371 lq_sta->total_success = 0;
1372 lq_sta->flush_timer = jiffies;
1373 lq_sta->visited_columns = 0;
1376 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1379 return find_last_bit(&rate_mask, BITS_PER_LONG);
1380 return IWL_RATE_INVALID;
1383 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1384 const struct rs_tx_column *column)
1386 switch (column->mode) {
1388 return lq_sta->max_legacy_rate_idx;
1390 return lq_sta->max_siso_rate_idx;
1392 return lq_sta->max_mimo2_rate_idx;
1397 return lq_sta->max_legacy_rate_idx;
1400 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1401 const struct rs_tx_column *column,
1404 /* Used to choose among HT tables */
1405 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1407 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1408 column->mode != RS_SISO &&
1409 column->mode != RS_MIMO2))
1410 return expected_tpt_legacy;
1412 /* Legacy rates have only one table */
1413 if (column->mode == RS_LEGACY)
1414 return expected_tpt_legacy;
1416 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1417 /* Choose among many HT tables depending on number of streams
1418 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1420 if (column->mode == RS_SISO) {
1422 case RATE_MCS_CHAN_WIDTH_20:
1423 ht_tbl_pointer = expected_tpt_siso_20MHz;
1425 case RATE_MCS_CHAN_WIDTH_40:
1426 ht_tbl_pointer = expected_tpt_siso_40MHz;
1428 case RATE_MCS_CHAN_WIDTH_80:
1429 ht_tbl_pointer = expected_tpt_siso_80MHz;
1434 } else if (column->mode == RS_MIMO2) {
1436 case RATE_MCS_CHAN_WIDTH_20:
1437 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1439 case RATE_MCS_CHAN_WIDTH_40:
1440 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1442 case RATE_MCS_CHAN_WIDTH_80:
1443 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1452 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1453 return ht_tbl_pointer[0];
1454 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1455 return ht_tbl_pointer[1];
1456 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1457 return ht_tbl_pointer[2];
1459 return ht_tbl_pointer[3];
1462 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1463 struct iwl_scale_tbl_info *tbl)
1465 struct rs_rate *rate = &tbl->rate;
1466 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1468 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1471 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1472 struct iwl_lq_sta *lq_sta,
1473 struct iwl_scale_tbl_info *tbl, /* "search" */
1474 unsigned long rate_mask, s8 index)
1476 struct iwl_scale_tbl_info *active_tbl =
1477 &(lq_sta->lq_info[lq_sta->active_tbl]);
1478 s32 success_ratio = active_tbl->win[index].success_ratio;
1479 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1480 const u16 *tpt_tbl = tbl->expected_tpt;
1485 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1486 target_tpt = 100 * expected_current_tpt;
1488 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1489 success_ratio, target_tpt);
1491 target_tpt = lq_sta->last_tpt;
1493 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1494 success_ratio, target_tpt);
1497 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1499 while (rate_idx != IWL_RATE_INVALID) {
1500 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1503 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1506 rate_idx = (high_low >> 8) & 0xff;
1509 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1510 rate_idx, target_tpt,
1511 rate_idx != IWL_RATE_INVALID ?
1512 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1517 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1519 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1520 return RATE_MCS_CHAN_WIDTH_80;
1521 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1522 return RATE_MCS_CHAN_WIDTH_40;
1524 return RATE_MCS_CHAN_WIDTH_20;
1528 * Check whether we should continue using same modulation mode, or
1529 * begin search for a new mode, based on:
1530 * 1) # tx successes or failures while using this mode
1531 * 2) # times calling this function
1532 * 3) elapsed time in this mode (not used, for now)
1534 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1536 struct iwl_scale_tbl_info *tbl;
1538 int flush_interval_passed = 0;
1539 struct iwl_mvm *mvm;
1541 mvm = lq_sta->pers.drv;
1542 active_tbl = lq_sta->active_tbl;
1544 tbl = &(lq_sta->lq_info[active_tbl]);
1546 /* If we've been disallowing search, see if we should now allow it */
1547 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1548 /* Elapsed time using current modulation mode */
1549 if (lq_sta->flush_timer)
1550 flush_interval_passed =
1552 (unsigned long)(lq_sta->flush_timer +
1553 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1556 * Check if we should allow search for new modulation mode.
1557 * If many frames have failed or succeeded, or we've used
1558 * this same modulation for a long time, allow search, and
1559 * reset history stats that keep track of whether we should
1560 * allow a new search. Also (below) reset all bitmaps and
1561 * stats in active history.
1564 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1565 (lq_sta->total_success > lq_sta->max_success_limit) ||
1566 ((!lq_sta->search_better_tbl) &&
1567 (lq_sta->flush_timer) && (flush_interval_passed))) {
1569 "LQ: stay is expired %d %d %d\n",
1570 lq_sta->total_failed,
1571 lq_sta->total_success,
1572 flush_interval_passed);
1574 /* Allow search for new mode */
1575 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1577 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1578 lq_sta->total_failed = 0;
1579 lq_sta->total_success = 0;
1580 lq_sta->flush_timer = 0;
1581 /* mark the current column as visited */
1582 lq_sta->visited_columns = BIT(tbl->column);
1584 * Else if we've used this modulation mode enough repetitions
1585 * (regardless of elapsed time or success/failure), reset
1586 * history bitmaps and rate-specific stats for all rates in
1590 lq_sta->table_count++;
1591 if (lq_sta->table_count >=
1592 lq_sta->table_count_limit) {
1593 lq_sta->table_count = 0;
1596 "LQ: stay in table clear win\n");
1597 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1601 /* If transitioning to allow "search", reset all history
1602 * bitmaps and stats in active table (this will become the new
1603 * "search" table). */
1604 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1605 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1611 * setup rate table in uCode
1613 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1614 struct ieee80211_sta *sta,
1615 struct iwl_lq_sta *lq_sta,
1616 struct iwl_scale_tbl_info *tbl)
1618 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1619 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1622 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1623 struct iwl_lq_sta *lq_sta,
1624 struct ieee80211_sta *sta,
1625 struct iwl_scale_tbl_info *tbl)
1628 enum rs_column next_col_id;
1629 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1630 const struct rs_tx_column *next_col;
1631 allow_column_func_t allow_func;
1632 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1633 const u16 *expected_tpt_tbl;
1634 u16 tpt, max_expected_tpt;
1636 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1637 next_col_id = curr_col->next_columns[i];
1639 if (next_col_id == RS_COLUMN_INVALID)
1642 if (lq_sta->visited_columns & BIT(next_col_id)) {
1643 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1648 next_col = &rs_tx_columns[next_col_id];
1650 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1652 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1653 next_col_id, valid_ants, next_col->ant);
1657 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1658 allow_func = next_col->checks[j];
1659 if (allow_func && !allow_func(mvm, sta, tbl, next_col))
1663 if (j != MAX_COLUMN_CHECKS) {
1665 "Skip column %d: not allowed (check %d failed)\n",
1671 tpt = lq_sta->last_tpt / 100;
1672 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1673 rs_bw_from_sta_bw(sta));
1674 if (WARN_ON_ONCE(!expected_tpt_tbl))
1677 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1678 if (max_rate == IWL_RATE_INVALID) {
1680 "Skip column %d: no rate is allowed in this column\n",
1685 max_expected_tpt = expected_tpt_tbl[max_rate];
1686 if (tpt >= max_expected_tpt) {
1688 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1689 next_col_id, max_expected_tpt, tpt);
1694 "Found potential column %d. Max expected %d current %d\n",
1695 next_col_id, max_expected_tpt, tpt);
1699 if (i == MAX_NEXT_COLUMNS)
1700 return RS_COLUMN_INVALID;
1705 static int rs_switch_to_column(struct iwl_mvm *mvm,
1706 struct iwl_lq_sta *lq_sta,
1707 struct ieee80211_sta *sta,
1708 enum rs_column col_id)
1710 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1711 struct iwl_scale_tbl_info *search_tbl =
1712 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1713 struct rs_rate *rate = &search_tbl->rate;
1714 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1715 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1716 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1717 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1718 unsigned long rate_mask = 0;
1721 memcpy(search_tbl, tbl, sz);
1723 rate->sgi = column->sgi;
1724 rate->ant = column->ant;
1726 if (column->mode == RS_LEGACY) {
1727 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1728 rate->type = LQ_LEGACY_A;
1730 rate->type = LQ_LEGACY_G;
1732 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1734 rate_mask = lq_sta->active_legacy_rate;
1735 } else if (column->mode == RS_SISO) {
1736 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1737 rate_mask = lq_sta->active_siso_rate;
1738 } else if (column->mode == RS_MIMO2) {
1739 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1740 rate_mask = lq_sta->active_mimo2_rate;
1742 WARN_ON_ONCE("Bad column mode");
1745 if (column->mode != RS_LEGACY) {
1746 rate->bw = rs_bw_from_sta_bw(sta);
1747 rate->ldpc = lq_sta->ldpc;
1750 search_tbl->column = col_id;
1751 rs_set_expected_tpt_table(lq_sta, search_tbl);
1753 lq_sta->visited_columns |= BIT(col_id);
1755 /* Get the best matching rate if we're changing modes. e.g.
1756 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1758 if (curr_column->mode != column->mode) {
1759 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1760 rate_mask, rate->index);
1762 if ((rate_idx == IWL_RATE_INVALID) ||
1763 !(BIT(rate_idx) & rate_mask)) {
1765 "can not switch with index %d"
1767 rate_idx, rate_mask);
1772 rate->index = rate_idx;
1775 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1776 col_id, rate->index);
1781 rate->type = LQ_NONE;
1785 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1786 struct iwl_scale_tbl_info *tbl,
1787 s32 sr, int low, int high,
1789 int low_tpt, int high_tpt)
1791 enum rs_action action = RS_ACTION_STAY;
1793 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1794 (current_tpt == 0)) {
1796 "Decrease rate because of low SR\n");
1797 return RS_ACTION_DOWNSCALE;
1800 if ((low_tpt == IWL_INVALID_VALUE) &&
1801 (high_tpt == IWL_INVALID_VALUE) &&
1802 (high != IWL_RATE_INVALID)) {
1804 "No data about high/low rates. Increase rate\n");
1805 return RS_ACTION_UPSCALE;
1808 if ((high_tpt == IWL_INVALID_VALUE) &&
1809 (high != IWL_RATE_INVALID) &&
1810 (low_tpt != IWL_INVALID_VALUE) &&
1811 (low_tpt < current_tpt)) {
1813 "No data about high rate and low rate is worse. Increase rate\n");
1814 return RS_ACTION_UPSCALE;
1817 if ((high_tpt != IWL_INVALID_VALUE) &&
1818 (high_tpt > current_tpt)) {
1820 "Higher rate is better. Increate rate\n");
1821 return RS_ACTION_UPSCALE;
1824 if ((low_tpt != IWL_INVALID_VALUE) &&
1825 (high_tpt != IWL_INVALID_VALUE) &&
1826 (low_tpt < current_tpt) &&
1827 (high_tpt < current_tpt)) {
1829 "Both high and low are worse. Maintain rate\n");
1830 return RS_ACTION_STAY;
1833 if ((low_tpt != IWL_INVALID_VALUE) &&
1834 (low_tpt > current_tpt)) {
1836 "Lower rate is better\n");
1837 action = RS_ACTION_DOWNSCALE;
1841 if ((low_tpt == IWL_INVALID_VALUE) &&
1842 (low != IWL_RATE_INVALID)) {
1844 "No data about lower rate\n");
1845 action = RS_ACTION_DOWNSCALE;
1849 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1852 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1853 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1855 "SR is above NO DECREASE. Avoid downscale\n");
1856 action = RS_ACTION_STAY;
1857 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1859 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1860 action = RS_ACTION_STAY;
1862 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1869 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1870 struct iwl_lq_sta *lq_sta)
1872 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1873 * supports STBC of at least 1*SS
1875 if (!lq_sta->stbc_capable)
1878 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1884 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1885 int *weaker, int *stronger)
1887 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1888 if (*weaker > TPC_MAX_REDUCTION)
1889 *weaker = TPC_INVALID;
1891 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1893 *stronger = TPC_INVALID;
1896 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1897 struct rs_rate *rate, enum ieee80211_band band)
1899 int index = rate->index;
1900 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1901 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1904 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1905 cam, sta_ps_disabled);
1907 * allow tpc only if power management is enabled, or bt coex
1908 * activity grade allows it and we are on 2.4Ghz.
1910 if ((cam || sta_ps_disabled) &&
1911 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1914 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1915 if (is_legacy(rate))
1916 return index == IWL_RATE_54M_INDEX;
1918 return index == IWL_RATE_MCS_7_INDEX;
1920 return index == IWL_RATE_MCS_7_INDEX ||
1921 index == IWL_RATE_MCS_8_INDEX ||
1922 index == IWL_RATE_MCS_9_INDEX;
1930 TPC_ACTION_DECREASE,
1931 TPC_ACTION_INCREASE,
1932 TPC_ACTION_NO_RESTIRCTION,
1935 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1936 s32 sr, int weak, int strong,
1938 int weak_tpt, int strong_tpt)
1940 /* stay until we have valid tpt */
1941 if (current_tpt == IWL_INVALID_VALUE) {
1942 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1943 return TPC_ACTION_STAY;
1946 /* Too many failures, increase txp */
1947 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1949 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1950 return TPC_ACTION_NO_RESTIRCTION;
1953 /* try decreasing first if applicable */
1954 if (weak != TPC_INVALID) {
1955 if (weak_tpt == IWL_INVALID_VALUE &&
1956 (strong_tpt == IWL_INVALID_VALUE ||
1957 current_tpt >= strong_tpt)) {
1959 "no weak txp measurement. decrease txp\n");
1960 return TPC_ACTION_DECREASE;
1963 if (weak_tpt > current_tpt) {
1965 "lower txp has better tpt. decrease txp\n");
1966 return TPC_ACTION_DECREASE;
1970 /* next, increase if needed */
1971 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1972 strong != TPC_INVALID) {
1973 if (weak_tpt == IWL_INVALID_VALUE &&
1974 strong_tpt != IWL_INVALID_VALUE &&
1975 current_tpt < strong_tpt) {
1977 "higher txp has better tpt. increase txp\n");
1978 return TPC_ACTION_INCREASE;
1981 if (weak_tpt < current_tpt &&
1982 (strong_tpt == IWL_INVALID_VALUE ||
1983 strong_tpt > current_tpt)) {
1985 "lower txp has worse tpt. increase txp\n");
1986 return TPC_ACTION_INCREASE;
1990 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1991 return TPC_ACTION_STAY;
1994 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1995 struct ieee80211_sta *sta,
1996 struct iwl_lq_sta *lq_sta,
1997 struct iwl_scale_tbl_info *tbl)
1999 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2000 struct ieee80211_vif *vif = mvm_sta->vif;
2001 struct ieee80211_chanctx_conf *chanctx_conf;
2002 enum ieee80211_band band;
2003 struct iwl_rate_scale_data *window;
2004 struct rs_rate *rate = &tbl->rate;
2005 enum tpc_action action;
2007 u8 cur = lq_sta->lq.reduced_tpc;
2010 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2012 #ifdef CONFIG_MAC80211_DEBUGFS
2013 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2014 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2015 lq_sta->pers.dbg_fixed_txp_reduction);
2016 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2017 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2022 chanctx_conf = rcu_dereference(vif->chanctx_conf);
2023 if (WARN_ON(!chanctx_conf))
2024 band = IEEE80211_NUM_BANDS;
2026 band = chanctx_conf->def.chan->band;
2029 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2031 "tpc is not allowed. remove txp restrictions\n");
2032 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2033 return cur != TPC_NO_REDUCTION;
2036 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2038 /* Collect measured throughputs for current and adjacent rates */
2039 window = tbl->tpc_win;
2040 sr = window[cur].success_ratio;
2041 current_tpt = window[cur].average_tpt;
2042 if (weak != TPC_INVALID)
2043 weak_tpt = window[weak].average_tpt;
2044 if (strong != TPC_INVALID)
2045 strong_tpt = window[strong].average_tpt;
2048 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2049 cur, current_tpt, sr, weak, strong,
2050 weak_tpt, strong_tpt);
2052 action = rs_get_tpc_action(mvm, sr, weak, strong,
2053 current_tpt, weak_tpt, strong_tpt);
2055 /* override actions if we are on the edge */
2056 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2057 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2058 action = TPC_ACTION_STAY;
2059 } else if (strong == TPC_INVALID &&
2060 (action == TPC_ACTION_INCREASE ||
2061 action == TPC_ACTION_NO_RESTIRCTION)) {
2062 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2063 action = TPC_ACTION_STAY;
2067 case TPC_ACTION_DECREASE:
2068 lq_sta->lq.reduced_tpc = weak;
2070 case TPC_ACTION_INCREASE:
2071 lq_sta->lq.reduced_tpc = strong;
2073 case TPC_ACTION_NO_RESTIRCTION:
2074 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2076 case TPC_ACTION_STAY:
2084 * Do rate scaling and search for new modulation mode.
2086 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2087 struct ieee80211_sta *sta,
2088 struct iwl_lq_sta *lq_sta,
2091 int low = IWL_RATE_INVALID;
2092 int high = IWL_RATE_INVALID;
2094 struct iwl_rate_scale_data *window = NULL;
2095 int current_tpt = IWL_INVALID_VALUE;
2096 int low_tpt = IWL_INVALID_VALUE;
2097 int high_tpt = IWL_INVALID_VALUE;
2099 enum rs_action scale_action = RS_ACTION_STAY;
2102 struct iwl_scale_tbl_info *tbl, *tbl1;
2107 u8 prev_agg = lq_sta->is_agg;
2108 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2109 struct iwl_mvm_tid_data *tid_data;
2110 struct rs_rate *rate;
2112 lq_sta->is_agg = !!sta_priv->agg_tids;
2115 * Select rate-scale / modulation-mode table to work with in
2116 * the rest of this function: "search" if searching for better
2117 * modulation mode, or "active" if doing rate scaling within a mode.
2119 if (!lq_sta->search_better_tbl)
2120 active_tbl = lq_sta->active_tbl;
2122 active_tbl = 1 - lq_sta->active_tbl;
2124 tbl = &(lq_sta->lq_info[active_tbl]);
2127 if (prev_agg != lq_sta->is_agg) {
2129 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2130 prev_agg, lq_sta->is_agg);
2131 rs_set_expected_tpt_table(lq_sta, tbl);
2132 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2135 /* current tx rate */
2136 index = lq_sta->last_txrate_idx;
2138 /* rates available for this association, and for modulation mode */
2139 rate_mask = rs_get_supported_rates(lq_sta, rate);
2141 if (!(BIT(index) & rate_mask)) {
2142 IWL_ERR(mvm, "Current Rate is not valid\n");
2143 if (lq_sta->search_better_tbl) {
2144 /* revert to active table if search table is not valid*/
2145 rate->type = LQ_NONE;
2146 lq_sta->search_better_tbl = 0;
2147 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2148 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2153 /* Get expected throughput table and history window for current rate */
2154 if (!tbl->expected_tpt) {
2155 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2159 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2160 window = &(tbl->win[index]);
2163 * If there is not enough history to calculate actual average
2164 * throughput, keep analyzing results of more tx frames, without
2165 * changing rate or mode (bypass most of the rest of this function).
2166 * Set up new rate table in uCode only if old rate is not supported
2167 * in current association (use new rate found above).
2169 fail_count = window->counter - window->success_counter;
2170 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2171 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2173 "(%s: %d): Test Window: succ %d total %d\n",
2174 rs_pretty_lq_type(rate->type),
2175 index, window->success_counter, window->counter);
2177 /* Can't calculate this yet; not enough history */
2178 window->average_tpt = IWL_INVALID_VALUE;
2180 /* Should we stay with this modulation mode,
2181 * or search for a new one? */
2182 rs_stay_in_table(lq_sta, false);
2186 /* Else we have enough samples; calculate estimate of
2187 * actual average throughput */
2188 if (window->average_tpt != ((window->success_ratio *
2189 tbl->expected_tpt[index] + 64) / 128)) {
2190 window->average_tpt = ((window->success_ratio *
2191 tbl->expected_tpt[index] + 64) / 128);
2194 /* If we are searching for better modulation mode, check success. */
2195 if (lq_sta->search_better_tbl) {
2196 /* If good success, continue using the "search" mode;
2197 * no need to send new link quality command, since we're
2198 * continuing to use the setup that we've been trying. */
2199 if (window->average_tpt > lq_sta->last_tpt) {
2201 "SWITCHING TO NEW TABLE SR: %d "
2202 "cur-tpt %d old-tpt %d\n",
2203 window->success_ratio,
2204 window->average_tpt,
2207 /* Swap tables; "search" becomes "active" */
2208 lq_sta->active_tbl = active_tbl;
2209 current_tpt = window->average_tpt;
2210 /* Else poor success; go back to mode in "active" table */
2213 "GOING BACK TO THE OLD TABLE: SR %d "
2214 "cur-tpt %d old-tpt %d\n",
2215 window->success_ratio,
2216 window->average_tpt,
2219 /* Nullify "search" table */
2220 rate->type = LQ_NONE;
2222 /* Revert to "active" table */
2223 active_tbl = lq_sta->active_tbl;
2224 tbl = &(lq_sta->lq_info[active_tbl]);
2226 /* Revert to "active" rate and throughput info */
2227 index = tbl->rate.index;
2228 current_tpt = lq_sta->last_tpt;
2230 /* Need to set up a new rate table in uCode */
2234 /* Either way, we've made a decision; modulation mode
2235 * search is done, allow rate adjustment next time. */
2236 lq_sta->search_better_tbl = 0;
2237 done_search = 1; /* Don't switch modes below! */
2241 /* (Else) not in search of better modulation mode, try for better
2242 * starting rate, while staying in this mode. */
2243 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2244 low = high_low & 0xff;
2245 high = (high_low >> 8) & 0xff;
2247 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2249 sr = window->success_ratio;
2251 /* Collect measured throughputs for current and adjacent rates */
2252 current_tpt = window->average_tpt;
2253 if (low != IWL_RATE_INVALID)
2254 low_tpt = tbl->win[low].average_tpt;
2255 if (high != IWL_RATE_INVALID)
2256 high_tpt = tbl->win[high].average_tpt;
2259 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2260 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2261 low, high, low_tpt, high_tpt);
2263 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2264 current_tpt, low_tpt, high_tpt);
2266 /* Force a search in case BT doesn't like us being in MIMO */
2267 if (is_mimo(rate) &&
2268 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2270 "BT Coex forbids MIMO. Search for new config\n");
2271 rs_stay_in_table(lq_sta, true);
2275 switch (scale_action) {
2276 case RS_ACTION_DOWNSCALE:
2277 /* Decrease starting rate, update uCode's rate table */
2278 if (low != IWL_RATE_INVALID) {
2283 "At the bottom rate. Can't decrease\n");
2287 case RS_ACTION_UPSCALE:
2288 /* Increase starting rate, update uCode's rate table */
2289 if (high != IWL_RATE_INVALID) {
2294 "At the top rate. Can't increase\n");
2298 case RS_ACTION_STAY:
2300 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2301 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2308 /* Replace uCode's rate table for the destination station. */
2310 tbl->rate.index = index;
2311 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2314 rs_stay_in_table(lq_sta, false);
2317 * Search for new modulation mode if we're:
2318 * 1) Not changing rates right now
2319 * 2) Not just finishing up a search
2320 * 3) Allowing a new search
2322 if (!update_lq && !done_search &&
2323 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2324 && window->counter) {
2325 enum rs_column next_column;
2327 /* Save current throughput to compare with "search" throughput*/
2328 lq_sta->last_tpt = current_tpt;
2331 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2332 update_lq, done_search, lq_sta->rs_state,
2335 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2336 if (next_column != RS_COLUMN_INVALID) {
2337 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2340 lq_sta->search_better_tbl = 1;
2343 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2344 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2347 /* If new "search" mode was selected, set up in uCode table */
2348 if (lq_sta->search_better_tbl) {
2349 /* Access the "search" table, clear its history. */
2350 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2351 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2353 /* Use new "search" start rate */
2354 index = tbl->rate.index;
2356 rs_dump_rate(mvm, &tbl->rate,
2357 "Switch to SEARCH TABLE:");
2358 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2364 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2365 /* If the "active" (non-search) mode was legacy,
2366 * and we've tried switching antennas,
2367 * but we haven't been able to try HT modes (not available),
2368 * stay with best antenna legacy modulation for a while
2369 * before next round of mode comparisons. */
2370 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2371 if (is_legacy(&tbl1->rate)) {
2372 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2374 if (tid != IWL_MAX_TID_COUNT) {
2375 tid_data = &sta_priv->tid_data[tid];
2376 if (tid_data->state != IWL_AGG_OFF) {
2378 "Stop aggregation on tid %d\n",
2380 ieee80211_stop_tx_ba_session(sta, tid);
2383 rs_set_stay_in_table(mvm, 1, lq_sta);
2385 /* If we're in an HT mode, and all 3 mode switch actions
2386 * have been tried and compared, stay in this best modulation
2387 * mode for a while before next round of mode comparisons. */
2388 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2389 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2390 (tid != IWL_MAX_TID_COUNT)) {
2391 tid_data = &sta_priv->tid_data[tid];
2392 if (tid_data->state == IWL_AGG_OFF) {
2394 "try to aggregate tid %d\n",
2396 rs_tl_turn_on_agg(mvm, tid,
2400 rs_set_stay_in_table(mvm, 0, lq_sta);
2405 lq_sta->last_txrate_idx = index;
2408 struct rs_init_rate_info {
2413 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2414 { -60, IWL_RATE_54M_INDEX },
2415 { -64, IWL_RATE_48M_INDEX },
2416 { -68, IWL_RATE_36M_INDEX },
2417 { -80, IWL_RATE_24M_INDEX },
2418 { -84, IWL_RATE_18M_INDEX },
2419 { -85, IWL_RATE_12M_INDEX },
2420 { -86, IWL_RATE_11M_INDEX },
2421 { -88, IWL_RATE_5M_INDEX },
2422 { -90, IWL_RATE_2M_INDEX },
2423 { S8_MIN, IWL_RATE_1M_INDEX },
2426 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2427 { -60, IWL_RATE_54M_INDEX },
2428 { -64, IWL_RATE_48M_INDEX },
2429 { -72, IWL_RATE_36M_INDEX },
2430 { -80, IWL_RATE_24M_INDEX },
2431 { -84, IWL_RATE_18M_INDEX },
2432 { -85, IWL_RATE_12M_INDEX },
2433 { -87, IWL_RATE_9M_INDEX },
2434 { S8_MIN, IWL_RATE_6M_INDEX },
2437 /* Choose an initial legacy rate and antenna to use based on the RSSI
2440 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2441 struct iwl_lq_sta *lq_sta,
2442 enum ieee80211_band band,
2443 struct rs_rate *rate)
2446 s8 best_rssi = S8_MIN;
2447 u8 best_ant = ANT_NONE;
2448 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2449 const struct rs_init_rate_info *initial_rates;
2451 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2452 if (!(lq_sta->pers.chains & BIT(i)))
2455 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2456 best_rssi = lq_sta->pers.chain_signal[i];
2461 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2462 rs_pretty_ant(best_ant), best_rssi);
2464 if (best_ant != ANT_A && best_ant != ANT_B)
2465 rate->ant = first_antenna(valid_tx_ant);
2467 rate->ant = best_ant;
2471 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2473 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2476 if (band == IEEE80211_BAND_5GHZ) {
2477 rate->type = LQ_LEGACY_A;
2478 initial_rates = rs_init_rates_5ghz;
2479 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2481 rate->type = LQ_LEGACY_G;
2482 initial_rates = rs_init_rates_24ghz;
2483 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2486 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2487 for (i = 0; i < nentries; i++) {
2488 int rate_idx = initial_rates[i].rate_idx;
2489 if ((best_rssi >= initial_rates[i].rssi) &&
2490 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2491 rate->index = rate_idx;
2497 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2498 rs_pretty_ant(rate->ant));
2501 /* Save info about RSSI of last Rx */
2502 void rs_update_last_rssi(struct iwl_mvm *mvm,
2503 struct iwl_lq_sta *lq_sta,
2504 struct ieee80211_rx_status *rx_status)
2506 lq_sta->pers.chains = rx_status->chains;
2507 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2508 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2509 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2513 * rs_initialize_lq - Initialize a station's hardware rate table
2515 * The uCode's station table contains a table of fallback rates
2516 * for automatic fallback during transmission.
2518 * NOTE: This sets up a default set of values. These will be replaced later
2519 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2522 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2523 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2524 * which requires station table entry to exist).
2526 static void rs_initialize_lq(struct iwl_mvm *mvm,
2527 struct ieee80211_sta *sta,
2528 struct iwl_lq_sta *lq_sta,
2529 enum ieee80211_band band,
2532 struct iwl_scale_tbl_info *tbl;
2533 struct rs_rate *rate;
2536 if (!sta || !lq_sta)
2539 if (!lq_sta->search_better_tbl)
2540 active_tbl = lq_sta->active_tbl;
2542 active_tbl = 1 - lq_sta->active_tbl;
2544 tbl = &(lq_sta->lq_info[active_tbl]);
2547 rs_get_initial_rate(mvm, lq_sta, band, rate);
2548 lq_sta->last_txrate_idx = rate->index;
2550 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2551 if (rate->ant == ANT_A)
2552 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2554 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2556 rs_set_expected_tpt_table(lq_sta, tbl);
2557 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2558 /* TODO restore station should remember the lq cmd */
2559 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2562 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2563 struct ieee80211_tx_rate_control *txrc)
2565 struct sk_buff *skb = txrc->skb;
2566 struct iwl_op_mode *op_mode __maybe_unused =
2567 (struct iwl_op_mode *)mvm_r;
2568 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2570 struct iwl_lq_sta *lq_sta = mvm_sta;
2572 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2573 /* if vif isn't initialized mvm doesn't know about
2574 * this station, so don't do anything with the it
2580 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2582 /* Treat uninitialized rate scaling data same as non-existing. */
2583 if (lq_sta && !lq_sta->pers.drv) {
2584 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2588 /* Send management frames and NO_ACK data using lowest rate. */
2589 if (rate_control_send_low(sta, mvm_sta, txrc))
2592 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2593 info->band, &info->control.rates[0]);
2595 info->control.rates[0].count = 1;
2598 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2601 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2602 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2603 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2604 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2606 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2608 lq_sta->pers.drv = mvm;
2609 #ifdef CONFIG_MAC80211_DEBUGFS
2610 lq_sta->pers.dbg_fixed_rate = 0;
2611 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2612 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2614 lq_sta->pers.chains = 0;
2615 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2617 return &sta_priv->lq_sta;
2620 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2623 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2624 (0x3 << (2 * (nss - 1)));
2625 rx_mcs >>= (2 * (nss - 1));
2627 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2628 return IWL_RATE_MCS_7_INDEX;
2629 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2630 return IWL_RATE_MCS_8_INDEX;
2631 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2632 return IWL_RATE_MCS_9_INDEX;
2634 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2638 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2639 struct ieee80211_sta_vht_cap *vht_cap,
2640 struct iwl_lq_sta *lq_sta)
2643 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2645 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2646 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2647 if (i == IWL_RATE_9M_INDEX)
2650 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2651 if (i == IWL_RATE_MCS_9_INDEX &&
2652 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2655 lq_sta->active_siso_rate |= BIT(i);
2659 if (sta->rx_nss < 2)
2662 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2663 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2664 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2665 if (i == IWL_RATE_9M_INDEX)
2668 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2669 if (i == IWL_RATE_MCS_9_INDEX &&
2670 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2673 lq_sta->active_mimo2_rate |= BIT(i);
2678 static void rs_ht_init(struct iwl_mvm *mvm,
2679 struct ieee80211_sta *sta,
2680 struct iwl_lq_sta *lq_sta,
2681 struct ieee80211_sta_ht_cap *ht_cap)
2683 /* active_siso_rate mask includes 9 MBits (bit 5),
2684 * and CCK (bits 0-3), supp_rates[] does not;
2685 * shift to convert format, force 9 MBits off.
2687 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2688 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2689 lq_sta->active_siso_rate &= ~((u16)0x2);
2690 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2692 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2693 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2694 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2695 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2697 if (mvm->cfg->ht_params->ldpc &&
2698 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2699 lq_sta->ldpc = true;
2701 if (mvm->cfg->ht_params->stbc &&
2702 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2703 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2704 lq_sta->stbc_capable = true;
2706 lq_sta->is_vht = false;
2709 static void rs_vht_init(struct iwl_mvm *mvm,
2710 struct ieee80211_sta *sta,
2711 struct iwl_lq_sta *lq_sta,
2712 struct ieee80211_sta_vht_cap *vht_cap)
2714 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2716 if (mvm->cfg->ht_params->ldpc &&
2717 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2718 lq_sta->ldpc = true;
2720 if (mvm->cfg->ht_params->stbc &&
2721 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2722 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2723 lq_sta->stbc_capable = true;
2725 if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2726 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2727 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2728 lq_sta->bfer_capable = true;
2730 lq_sta->is_vht = true;
2733 #ifdef CONFIG_IWLWIFI_DEBUGFS
2734 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2736 spin_lock_bh(&mvm->drv_stats_lock);
2737 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2738 spin_unlock_bh(&mvm->drv_stats_lock);
2741 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2743 u8 nss = 0, mcs = 0;
2745 spin_lock(&mvm->drv_stats_lock);
2748 mvm->drv_rx_stats.agg_frames++;
2750 mvm->drv_rx_stats.success_frames++;
2752 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2753 case RATE_MCS_CHAN_WIDTH_20:
2754 mvm->drv_rx_stats.bw_20_frames++;
2756 case RATE_MCS_CHAN_WIDTH_40:
2757 mvm->drv_rx_stats.bw_40_frames++;
2759 case RATE_MCS_CHAN_WIDTH_80:
2760 mvm->drv_rx_stats.bw_80_frames++;
2763 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2766 if (rate & RATE_MCS_HT_MSK) {
2767 mvm->drv_rx_stats.ht_frames++;
2768 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2769 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2770 } else if (rate & RATE_MCS_VHT_MSK) {
2771 mvm->drv_rx_stats.vht_frames++;
2772 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2773 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2774 RATE_VHT_MCS_NSS_POS) + 1;
2776 mvm->drv_rx_stats.legacy_frames++;
2780 mvm->drv_rx_stats.siso_frames++;
2782 mvm->drv_rx_stats.mimo2_frames++;
2784 if (rate & RATE_MCS_SGI_MSK)
2785 mvm->drv_rx_stats.sgi_frames++;
2787 mvm->drv_rx_stats.ngi_frames++;
2789 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2790 mvm->drv_rx_stats.last_frame_idx =
2791 (mvm->drv_rx_stats.last_frame_idx + 1) %
2792 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2794 spin_unlock(&mvm->drv_stats_lock);
2799 * Called after adding a new station to initialize rate scaling
2801 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2802 enum ieee80211_band band, bool init)
2805 struct ieee80211_hw *hw = mvm->hw;
2806 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2807 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2808 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2809 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2810 struct ieee80211_supported_band *sband;
2811 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2813 /* clear all non-persistent lq data */
2814 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2816 sband = hw->wiphy->bands[band];
2818 lq_sta->lq.sta_id = sta_priv->sta_id;
2820 for (j = 0; j < LQ_SIZE; j++)
2821 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2823 lq_sta->flush_timer = 0;
2824 lq_sta->last_tx = jiffies;
2827 "LQ: *** rate scale station global init for station %d ***\n",
2829 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2830 * the lowest or the highest rate.. Could consider using RSSI from
2831 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2834 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2835 lq_sta->band = sband->band;
2837 * active legacy rates as per supported rates bitmap
2839 supp = sta->supp_rates[sband->band];
2840 lq_sta->active_legacy_rate = 0;
2841 for_each_set_bit(i, &supp, BITS_PER_LONG)
2842 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2844 /* TODO: should probably account for rx_highest for both HT/VHT */
2845 if (!vht_cap || !vht_cap->vht_supported)
2846 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2848 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2850 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2851 lq_sta->active_mimo2_rate = 0;
2853 lq_sta->max_legacy_rate_idx =
2854 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2855 lq_sta->max_siso_rate_idx =
2856 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2857 lq_sta->max_mimo2_rate_idx =
2858 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2861 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2862 lq_sta->active_legacy_rate,
2863 lq_sta->active_siso_rate,
2864 lq_sta->active_mimo2_rate,
2865 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2866 lq_sta->bfer_capable);
2867 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2868 lq_sta->max_legacy_rate_idx,
2869 lq_sta->max_siso_rate_idx,
2870 lq_sta->max_mimo2_rate_idx);
2872 /* These values will be overridden later */
2873 lq_sta->lq.single_stream_ant_msk =
2874 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2875 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2877 /* as default allow aggregation for all tids */
2878 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2880 #ifdef CONFIG_IWLWIFI_DEBUGFS
2881 iwl_mvm_reset_frame_stats(mvm);
2883 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2886 static void rs_rate_update(void *mvm_r,
2887 struct ieee80211_supported_band *sband,
2888 struct cfg80211_chan_def *chandef,
2889 struct ieee80211_sta *sta, void *priv_sta,
2893 struct iwl_op_mode *op_mode =
2894 (struct iwl_op_mode *)mvm_r;
2895 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2897 if (!iwl_mvm_sta_from_mac80211(sta)->vif)
2900 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2901 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2902 ieee80211_stop_tx_ba_session(sta, tid);
2904 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2907 #ifdef CONFIG_MAC80211_DEBUGFS
2908 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2909 struct iwl_lq_cmd *lq_cmd,
2910 enum ieee80211_band band,
2913 struct rs_rate rate;
2915 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2916 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2917 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2919 for (i = 0; i < num_rates; i++)
2920 lq_cmd->rs_table[i] = ucode_rate_le32;
2922 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2925 lq_cmd->mimo_delim = num_rates - 1;
2927 lq_cmd->mimo_delim = 0;
2929 lq_cmd->reduced_tpc = 0;
2931 if (num_of_ant(ant) == 1)
2932 lq_cmd->single_stream_ant_msk = ant;
2934 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2936 #endif /* CONFIG_MAC80211_DEBUGFS */
2938 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2939 struct iwl_lq_sta *lq_sta,
2940 struct rs_rate *rate,
2941 __le32 *rs_table, int *rs_table_index,
2942 int num_rates, int num_retries,
2943 u8 valid_tx_ant, bool toggle_ant)
2947 bool bottom_reached = false;
2948 int prev_rate_idx = rate->index;
2949 int end = LINK_QUAL_MAX_RETRY_NUM;
2950 int index = *rs_table_index;
2952 for (i = 0; i < num_rates && index < end; i++) {
2953 for (j = 0; j < num_retries && index < end; j++, index++) {
2954 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2956 rs_table[index] = ucode_rate;
2958 rs_toggle_antenna(valid_tx_ant, rate);
2961 prev_rate_idx = rate->index;
2962 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2963 if (bottom_reached && !is_legacy(rate))
2967 if (!bottom_reached && !is_legacy(rate))
2968 rate->index = prev_rate_idx;
2970 *rs_table_index = index;
2973 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2974 * column the rate table should look like this:
2976 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2977 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2978 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2979 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2980 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2981 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2982 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2983 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2984 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2985 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2986 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2987 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2988 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2989 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2990 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2991 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2993 static void rs_build_rates_table(struct iwl_mvm *mvm,
2994 struct ieee80211_sta *sta,
2995 struct iwl_lq_sta *lq_sta,
2996 const struct rs_rate *initial_rate)
2998 struct rs_rate rate;
2999 int num_rates, num_retries, index = 0;
3000 u8 valid_tx_ant = 0;
3001 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3002 bool toggle_ant = false;
3004 memcpy(&rate, initial_rate, sizeof(rate));
3006 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3008 /* TODO: remove old API when min FW API hits 14 */
3009 if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3010 rs_stbc_allow(mvm, sta, lq_sta))
3013 if (is_siso(&rate)) {
3014 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3015 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3016 } else if (is_mimo(&rate)) {
3017 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3018 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3020 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3021 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3025 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3026 num_rates, num_retries, valid_tx_ant,
3029 rs_get_lower_rate_down_column(lq_sta, &rate);
3031 if (is_siso(&rate)) {
3032 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3033 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3034 lq_cmd->mimo_delim = index;
3035 } else if (is_legacy(&rate)) {
3036 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3037 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3044 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3045 num_rates, num_retries, valid_tx_ant,
3048 rs_get_lower_rate_down_column(lq_sta, &rate);
3050 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3051 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3053 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3054 num_rates, num_retries, valid_tx_ant,
3059 struct rs_bfer_active_iter_data {
3060 struct ieee80211_sta *exclude_sta;
3061 struct iwl_mvm_sta *bfer_mvmsta;
3064 static void rs_bfer_active_iter(void *_data,
3065 struct ieee80211_sta *sta)
3067 struct rs_bfer_active_iter_data *data = _data;
3068 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3069 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
3070 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3072 if (sta == data->exclude_sta)
3075 /* The current sta has BFER allowed */
3076 if (ss_params & LQ_SS_BFER_ALLOWED) {
3077 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3079 data->bfer_mvmsta = mvmsta;
3083 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3086 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3089 case NL80211_IFTYPE_AP:
3090 case NL80211_IFTYPE_P2P_GO:
3093 case NL80211_IFTYPE_P2P_CLIENT:
3096 case NL80211_IFTYPE_STATION:
3100 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3107 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3108 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3109 struct iwl_mvm_sta *sta2)
3111 int prio1 = rs_bfer_priority(sta1);
3112 int prio2 = rs_bfer_priority(sta2);
3121 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3122 struct ieee80211_sta *sta,
3123 struct iwl_lq_sta *lq_sta,
3124 const struct rs_rate *initial_rate)
3126 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3127 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3128 struct rs_bfer_active_iter_data data = {
3130 .bfer_mvmsta = NULL,
3132 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3133 u32 ss_params = LQ_SS_PARAMS_VALID;
3135 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3138 #ifdef CONFIG_MAC80211_DEBUGFS
3139 /* Check if forcing the decision is configured.
3140 * Note that SISO is forced by not allowing STBC or BFER
3142 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3143 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3144 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3145 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3147 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3148 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3149 lq_sta->pers.ss_force);
3154 if (lq_sta->stbc_capable)
3155 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3157 if (!lq_sta->bfer_capable)
3160 ieee80211_iterate_stations_atomic(mvm->hw,
3161 rs_bfer_active_iter,
3163 bfer_mvmsta = data.bfer_mvmsta;
3165 /* This code is safe as it doesn't run concurrently for different
3166 * stations. This is guaranteed by the fact that calls to
3167 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3170 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3172 ss_params |= LQ_SS_BFER_ALLOWED;
3176 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3177 bfer_mvmsta->sta_id);
3179 /* Disallow BFER on another STA if active and we're a higher priority */
3180 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3181 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3182 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3184 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3185 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3186 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3188 ss_params |= LQ_SS_BFER_ALLOWED;
3190 "Lower priority BFER sta found (%d). Switch BFER\n",
3191 bfer_mvmsta->sta_id);
3194 lq_cmd->ss_params = cpu_to_le32(ss_params);
3197 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3198 struct ieee80211_sta *sta,
3199 struct iwl_lq_sta *lq_sta,
3200 const struct rs_rate *initial_rate)
3202 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3203 struct iwl_mvm_sta *mvmsta;
3204 struct iwl_mvm_vif *mvmvif;
3206 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3207 lq_cmd->agg_time_limit =
3208 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3210 #ifdef CONFIG_MAC80211_DEBUGFS
3211 if (lq_sta->pers.dbg_fixed_rate) {
3212 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3214 lq_sta->pers.dbg_fixed_rate);
3218 if (WARN_ON_ONCE(!sta || !initial_rate))
3221 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3223 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3224 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3226 if (num_of_ant(initial_rate->ant) == 1)
3227 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3229 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3230 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3232 if (num_of_ant(initial_rate->ant) == 1)
3233 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3235 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3238 * In case of low latency, tell the firmware to leave a frame in the
3239 * Tx Fifo so that it can start a transaction in the same TxOP. This
3240 * basically allows the firmware to send bursts.
3242 if (iwl_mvm_vif_low_latency(mvmvif)) {
3243 lq_cmd->agg_frame_cnt_limit--;
3245 if (mvm->low_latency_agg_frame_limit)
3246 lq_cmd->agg_frame_cnt_limit =
3247 min(lq_cmd->agg_frame_cnt_limit,
3248 mvm->low_latency_agg_frame_limit);
3251 if (mvmsta->vif->p2p)
3252 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3254 lq_cmd->agg_time_limit =
3255 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3258 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3262 /* rate scale requires free function to be implemented */
3263 static void rs_free(void *mvm_rate)
3268 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3271 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3272 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3274 IWL_DEBUG_RATE(mvm, "enter\n");
3275 IWL_DEBUG_RATE(mvm, "leave\n");
3278 #ifdef CONFIG_MAC80211_DEBUGFS
3279 int rs_pretty_print_rate(char *buf, const u32 rate)
3283 u8 mcs = 0, nss = 0;
3284 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3286 if (!(rate & RATE_MCS_HT_MSK) &&
3287 !(rate & RATE_MCS_VHT_MSK)) {
3288 int index = iwl_hwrate_to_plcp_idx(rate);
3290 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3292 index == IWL_RATE_INVALID ? "BAD" :
3293 iwl_rate_mcs[index].mbps);
3296 if (rate & RATE_MCS_VHT_MSK) {
3298 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3299 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3300 >> RATE_VHT_MCS_NSS_POS) + 1;
3301 } else if (rate & RATE_MCS_HT_MSK) {
3303 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3305 type = "Unknown"; /* shouldn't happen */
3308 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3309 case RATE_MCS_CHAN_WIDTH_20:
3312 case RATE_MCS_CHAN_WIDTH_40:
3315 case RATE_MCS_CHAN_WIDTH_80:
3318 case RATE_MCS_CHAN_WIDTH_160:
3325 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3326 type, rs_pretty_ant(ant), bw, mcs, nss,
3327 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3328 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3329 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3330 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3331 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3335 * Program the device to use fixed rate for frame transmit
3336 * This is for debugging/testing only
3337 * once the device start use fixed rate, we need to reload the module
3338 * to being back the normal operation.
3340 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3341 struct iwl_lq_sta *lq_sta)
3343 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3344 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3345 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3347 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3348 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3350 if (lq_sta->pers.dbg_fixed_rate) {
3351 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3352 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3356 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3357 const char __user *user_buf, size_t count, loff_t *ppos)
3359 struct iwl_lq_sta *lq_sta = file->private_data;
3360 struct iwl_mvm *mvm;
3365 mvm = lq_sta->pers.drv;
3366 memset(buf, 0, sizeof(buf));
3367 buf_size = min(count, sizeof(buf) - 1);
3368 if (copy_from_user(buf, user_buf, buf_size))
3371 if (sscanf(buf, "%x", &parsed_rate) == 1)
3372 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3374 lq_sta->pers.dbg_fixed_rate = 0;
3376 rs_program_fix_rate(mvm, lq_sta);
3381 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3382 char __user *user_buf, size_t count, loff_t *ppos)
3389 struct iwl_lq_sta *lq_sta = file->private_data;
3390 struct iwl_mvm *mvm;
3391 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3392 struct rs_rate *rate = &tbl->rate;
3394 mvm = lq_sta->pers.drv;
3395 buff = kmalloc(2048, GFP_KERNEL);
3399 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3400 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3401 lq_sta->total_failed, lq_sta->total_success,
3402 lq_sta->active_legacy_rate);
3403 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3404 lq_sta->pers.dbg_fixed_rate);
3405 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3406 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3407 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3408 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3409 desc += sprintf(buff+desc, "lq type %s\n",
3410 (is_legacy(rate)) ? "legacy" :
3411 is_vht(rate) ? "VHT" : "HT");
3412 if (!is_legacy(rate)) {
3413 desc += sprintf(buff + desc, " %s",
3414 (is_siso(rate)) ? "SISO" : "MIMO2");
3415 desc += sprintf(buff + desc, " %s",
3416 (is_ht20(rate)) ? "20MHz" :
3417 (is_ht40(rate)) ? "40MHz" :
3418 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3419 desc += sprintf(buff + desc, " %s %s %s\n",
3420 (rate->sgi) ? "SGI" : "NGI",
3421 (rate->ldpc) ? "LDPC" : "BCC",
3422 (lq_sta->is_agg) ? "AGG on" : "");
3424 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3425 lq_sta->last_rate_n_flags);
3426 desc += sprintf(buff+desc,
3427 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3429 lq_sta->lq.mimo_delim,
3430 lq_sta->lq.single_stream_ant_msk,
3431 lq_sta->lq.dual_stream_ant_msk);
3433 desc += sprintf(buff+desc,
3434 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3435 le16_to_cpu(lq_sta->lq.agg_time_limit),
3436 lq_sta->lq.agg_disable_start_th,
3437 lq_sta->lq.agg_frame_cnt_limit);
3439 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3440 ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3441 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n",
3442 (ss_params & LQ_SS_PARAMS_VALID) ?
3443 "VALID" : "INVALID",
3444 (ss_params & LQ_SS_BFER_ALLOWED) ?
3446 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3448 (ss_params & LQ_SS_FORCE) ?
3450 desc += sprintf(buff+desc,
3451 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3452 lq_sta->lq.initial_rate_index[0],
3453 lq_sta->lq.initial_rate_index[1],
3454 lq_sta->lq.initial_rate_index[2],
3455 lq_sta->lq.initial_rate_index[3]);
3457 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3458 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3460 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3461 desc += rs_pretty_print_rate(buff+desc, r);
3464 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3469 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3470 .write = rs_sta_dbgfs_scale_table_write,
3471 .read = rs_sta_dbgfs_scale_table_read,
3472 .open = simple_open,
3473 .llseek = default_llseek,
3475 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3476 char __user *user_buf, size_t count, loff_t *ppos)
3482 struct iwl_scale_tbl_info *tbl;
3483 struct rs_rate *rate;
3484 struct iwl_lq_sta *lq_sta = file->private_data;
3486 buff = kmalloc(1024, GFP_KERNEL);
3490 for (i = 0; i < LQ_SIZE; i++) {
3491 tbl = &(lq_sta->lq_info[i]);
3493 desc += sprintf(buff+desc,
3494 "%s type=%d SGI=%d BW=%s DUP=0\n"
3496 lq_sta->active_tbl == i ? "*" : "x",
3499 is_ht20(rate) ? "20Mhz" :
3500 is_ht40(rate) ? "40Mhz" :
3501 is_ht80(rate) ? "80Mhz" : "ERR",
3503 for (j = 0; j < IWL_RATE_COUNT; j++) {
3504 desc += sprintf(buff+desc,
3505 "counter=%d success=%d %%=%d\n",
3506 tbl->win[j].counter,
3507 tbl->win[j].success_counter,
3508 tbl->win[j].success_ratio);
3511 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3516 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3517 .read = rs_sta_dbgfs_stats_table_read,
3518 .open = simple_open,
3519 .llseek = default_llseek,
3522 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3523 char __user *user_buf,
3524 size_t count, loff_t *ppos)
3526 static const char * const column_name[] = {
3527 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3528 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3529 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3530 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3531 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3532 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3533 [RS_COLUMN_MIMO2] = "MIMO2",
3534 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3537 static const char * const rate_name[] = {
3538 [IWL_RATE_1M_INDEX] = "1M",
3539 [IWL_RATE_2M_INDEX] = "2M",
3540 [IWL_RATE_5M_INDEX] = "5.5M",
3541 [IWL_RATE_11M_INDEX] = "11M",
3542 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3543 [IWL_RATE_9M_INDEX] = "9M",
3544 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3545 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3546 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3547 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3548 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3549 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3550 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3551 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3552 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3555 char *buff, *pos, *endpos;
3558 struct iwl_lq_sta *lq_sta = file->private_data;
3559 struct rs_rate_stats *stats;
3560 static const size_t bufsz = 1024;
3562 buff = kmalloc(bufsz, GFP_KERNEL);
3567 endpos = pos + bufsz;
3569 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3570 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3571 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3572 pos += scnprintf(pos, endpos - pos, "\n");
3574 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3575 pos += scnprintf(pos, endpos - pos,
3576 "%s,", column_name[col]);
3578 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3579 stats = &(lq_sta->pers.tx_stats[col][rate]);
3580 pos += scnprintf(pos, endpos - pos,
3585 pos += scnprintf(pos, endpos - pos, "\n");
3588 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3593 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3594 const char __user *user_buf,
3595 size_t count, loff_t *ppos)
3597 struct iwl_lq_sta *lq_sta = file->private_data;
3598 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3603 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3604 .read = rs_sta_dbgfs_drv_tx_stats_read,
3605 .write = rs_sta_dbgfs_drv_tx_stats_write,
3606 .open = simple_open,
3607 .llseek = default_llseek,
3610 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3611 char __user *user_buf,
3612 size_t count, loff_t *ppos)
3614 struct iwl_lq_sta *lq_sta = file->private_data;
3616 int bufsz = sizeof(buf);
3618 static const char * const ss_force_name[] = {
3619 [RS_SS_FORCE_NONE] = "none",
3620 [RS_SS_FORCE_STBC] = "stbc",
3621 [RS_SS_FORCE_BFER] = "bfer",
3622 [RS_SS_FORCE_SISO] = "siso",
3625 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3626 ss_force_name[lq_sta->pers.ss_force]);
3627 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3630 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3631 size_t count, loff_t *ppos)
3633 struct iwl_mvm *mvm = lq_sta->pers.drv;
3636 if (!strncmp("none", buf, 4)) {
3637 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
3638 } else if (!strncmp("siso", buf, 4)) {
3639 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
3640 } else if (!strncmp("stbc", buf, 4)) {
3641 if (lq_sta->stbc_capable) {
3642 lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
3645 "can't force STBC. peer doesn't support\n");
3648 } else if (!strncmp("bfer", buf, 4)) {
3649 if (lq_sta->bfer_capable) {
3650 lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
3653 "can't force BFER. peer doesn't support\n");
3657 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3660 return ret ?: count;
3663 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3664 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3665 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3666 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3667 &iwl_dbgfs_##name##_ops)) \
3671 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3673 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir)
3675 struct iwl_lq_sta *lq_sta = priv_sta;
3676 struct iwl_mvm_sta *mvmsta;
3678 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
3683 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3684 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3685 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3686 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3687 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3688 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3689 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3690 &lq_sta->tx_agg_tid_en);
3691 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3692 &lq_sta->pers.dbg_fixed_txp_reduction);
3694 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3697 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3700 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3706 * Initialization of rate scaling information is done by driver after
3707 * the station is added. Since mac80211 calls this function before a
3708 * station is added we ignore it.
3710 static void rs_rate_init_stub(void *mvm_r,
3711 struct ieee80211_supported_band *sband,
3712 struct cfg80211_chan_def *chandef,
3713 struct ieee80211_sta *sta, void *mvm_sta)
3717 static const struct rate_control_ops rs_mvm_ops = {
3719 .tx_status = rs_mac80211_tx_status,
3720 .get_rate = rs_get_rate,
3721 .rate_init = rs_rate_init_stub,
3724 .alloc_sta = rs_alloc_sta,
3725 .free_sta = rs_free_sta,
3726 .rate_update = rs_rate_update,
3727 #ifdef CONFIG_MAC80211_DEBUGFS
3728 .add_sta_debugfs = rs_add_debugfs,
3729 .remove_sta_debugfs = rs_remove_debugfs,
3733 int iwl_mvm_rate_control_register(void)
3735 return ieee80211_rate_control_register(&rs_mvm_ops);
3738 void iwl_mvm_rate_control_unregister(void)
3740 ieee80211_rate_control_unregister(&rs_mvm_ops);
3744 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3745 * Tx protection, according to this request and previous requests,
3746 * and send the LQ command.
3747 * @mvmsta: The station
3748 * @enable: Enable Tx protection?
3750 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3753 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3755 lockdep_assert_held(&mvm->mutex);
3758 if (mvmsta->tx_protection == 0)
3759 lq->flags |= LQ_FLAG_USE_RTS_MSK;
3760 mvmsta->tx_protection++;
3762 mvmsta->tx_protection--;
3763 if (mvmsta->tx_protection == 0)
3764 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3767 return iwl_mvm_send_lq_cmd(mvm, lq, false);