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
137 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
138 struct ieee80211_sta *sta,
139 struct iwl_scale_tbl_info *tbl);
141 struct rs_tx_column {
142 enum rs_column_mode mode;
145 enum rs_column next_columns[MAX_NEXT_COLUMNS];
146 allow_column_func_t checks[MAX_COLUMN_CHECKS];
149 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
150 struct iwl_scale_tbl_info *tbl)
152 return iwl_mvm_bt_coex_is_ant_avail(mvm, tbl->rate.ant);
155 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
156 struct iwl_scale_tbl_info *tbl)
158 if (!sta->ht_cap.ht_supported)
161 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
164 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
167 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
173 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
174 struct iwl_scale_tbl_info *tbl)
176 if (!sta->ht_cap.ht_supported)
182 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
183 struct iwl_scale_tbl_info *tbl)
185 struct rs_rate *rate = &tbl->rate;
186 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
187 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
189 if (is_ht20(rate) && (ht_cap->cap &
190 IEEE80211_HT_CAP_SGI_20))
192 if (is_ht40(rate) && (ht_cap->cap &
193 IEEE80211_HT_CAP_SGI_40))
195 if (is_ht80(rate) && (vht_cap->cap &
196 IEEE80211_VHT_CAP_SHORT_GI_80))
202 static const struct rs_tx_column rs_tx_columns[] = {
203 [RS_COLUMN_LEGACY_ANT_A] = {
207 RS_COLUMN_LEGACY_ANT_B,
208 RS_COLUMN_SISO_ANT_A,
219 [RS_COLUMN_LEGACY_ANT_B] = {
223 RS_COLUMN_LEGACY_ANT_A,
224 RS_COLUMN_SISO_ANT_B,
235 [RS_COLUMN_SISO_ANT_A] = {
239 RS_COLUMN_SISO_ANT_B,
241 RS_COLUMN_SISO_ANT_A_SGI,
242 RS_COLUMN_LEGACY_ANT_A,
243 RS_COLUMN_LEGACY_ANT_B,
252 [RS_COLUMN_SISO_ANT_B] = {
256 RS_COLUMN_SISO_ANT_A,
258 RS_COLUMN_SISO_ANT_B_SGI,
259 RS_COLUMN_LEGACY_ANT_A,
260 RS_COLUMN_LEGACY_ANT_B,
269 [RS_COLUMN_SISO_ANT_A_SGI] = {
274 RS_COLUMN_SISO_ANT_B_SGI,
276 RS_COLUMN_SISO_ANT_A,
277 RS_COLUMN_LEGACY_ANT_A,
278 RS_COLUMN_LEGACY_ANT_B,
288 [RS_COLUMN_SISO_ANT_B_SGI] = {
293 RS_COLUMN_SISO_ANT_A_SGI,
295 RS_COLUMN_SISO_ANT_B,
296 RS_COLUMN_LEGACY_ANT_A,
297 RS_COLUMN_LEGACY_ANT_B,
307 [RS_COLUMN_MIMO2] = {
311 RS_COLUMN_SISO_ANT_A,
313 RS_COLUMN_LEGACY_ANT_A,
314 RS_COLUMN_LEGACY_ANT_B,
323 [RS_COLUMN_MIMO2_SGI] = {
328 RS_COLUMN_SISO_ANT_A_SGI,
330 RS_COLUMN_LEGACY_ANT_A,
331 RS_COLUMN_LEGACY_ANT_B,
343 static inline u8 rs_extract_rate(u32 rate_n_flags)
345 /* also works for HT because bits 7:6 are zero there */
346 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
349 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
353 if (rate_n_flags & RATE_MCS_HT_MSK) {
354 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
355 idx += IWL_RATE_MCS_0_INDEX;
357 /* skip 9M not supported in HT*/
358 if (idx >= IWL_RATE_9M_INDEX)
360 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
362 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
363 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
364 idx += IWL_RATE_MCS_0_INDEX;
366 /* skip 9M not supported in VHT*/
367 if (idx >= IWL_RATE_9M_INDEX)
369 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
372 /* legacy rate format, search for match in table */
374 u8 legacy_rate = rs_extract_rate(rate_n_flags);
375 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
376 if (iwl_rates[idx].plcp == legacy_rate)
380 return IWL_RATE_INVALID;
383 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
384 struct ieee80211_sta *sta,
385 struct iwl_lq_sta *lq_sta,
387 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
388 struct ieee80211_sta *sta,
389 struct iwl_lq_sta *lq_sta,
390 const struct rs_rate *initial_rate);
391 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
394 * The following tables contain the expected throughput metrics for all rates
396 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
398 * where invalid entries are zeros.
400 * CCK rates are only valid in legacy table and will only be used in G
404 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
405 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
408 /* Expected TpT tables. 4 indexes:
409 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
411 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
412 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
413 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
414 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
415 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
418 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
419 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
420 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
421 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
422 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
425 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
426 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
427 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
428 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
429 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
432 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
433 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
434 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
435 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
436 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
439 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
440 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
441 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
442 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
443 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
446 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
447 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
448 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
449 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
450 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
454 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
463 { "24", "16QAM 1/2"},
464 { "36", "16QAM 3/4"},
465 { "48", "64QAM 2/3"},
466 { "54", "64QAM 3/4"},
467 { "60", "64QAM 5/6"},
470 #define MCS_INDEX_PER_STREAM (8)
472 static const char *rs_pretty_ant(u8 ant)
474 static const char * const ant_name[] = {
488 return ant_name[ant];
491 static const char *rs_pretty_lq_type(enum iwl_table_type type)
493 static const char * const lq_types[] = {
495 [LQ_LEGACY_A] = "LEGACY_A",
496 [LQ_LEGACY_G] = "LEGACY_G",
497 [LQ_HT_SISO] = "HT SISO",
498 [LQ_HT_MIMO2] = "HT MIMO",
499 [LQ_VHT_SISO] = "VHT SISO",
500 [LQ_VHT_MIMO2] = "VHT MIMO",
503 if (type < LQ_NONE || type >= LQ_MAX)
506 return lq_types[type];
509 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
513 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
514 prefix, rs_pretty_lq_type(rate->type),
515 rate->index, rs_pretty_ant(rate->ant),
516 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
519 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
522 window->success_counter = 0;
523 window->success_ratio = IWL_INVALID_VALUE;
525 window->average_tpt = IWL_INVALID_VALUE;
528 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
529 struct iwl_scale_tbl_info *tbl)
533 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
534 for (i = 0; i < IWL_RATE_COUNT; i++)
535 rs_rate_scale_clear_window(&tbl->win[i]);
537 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
538 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
541 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
543 return (ant_type & valid_antenna) == ant_type;
546 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
547 struct iwl_lq_sta *lq_data, u8 tid,
548 struct ieee80211_sta *sta)
552 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
554 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
555 if (ret == -EAGAIN) {
557 * driver and mac80211 is out of sync
558 * this might be cause by reloading firmware
559 * stop the tx ba session here
561 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
563 ieee80211_stop_tx_ba_session(sta, tid);
568 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
569 struct iwl_lq_sta *lq_data,
570 struct ieee80211_sta *sta)
572 if (tid < IWL_MAX_TID_COUNT)
573 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
575 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
576 tid, IWL_MAX_TID_COUNT);
579 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
581 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
582 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
583 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
587 * Static function to get the expected throughput from an iwl_scale_tbl_info
588 * that wraps a NULL pointer check
590 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
592 if (tbl->expected_tpt)
593 return tbl->expected_tpt[rs_index];
598 * rs_collect_tx_data - Update the success/failure sliding window
600 * We keep a sliding window of the last 62 packets transmitted
601 * at this rate. window->data contains the bitmask of successful
604 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
605 struct iwl_scale_tbl_info *tbl,
606 int scale_index, int attempts, int successes,
607 struct iwl_rate_scale_data *window)
609 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
612 /* Get expected throughput */
613 tpt = get_expected_tpt(tbl, scale_index);
616 * Keep track of only the latest 62 tx frame attempts in this rate's
617 * history window; anything older isn't really relevant any more.
618 * If we have filled up the sliding window, drop the oldest attempt;
619 * if the oldest attempt (highest bit in bitmap) shows "success",
620 * subtract "1" from the success counter (this is the main reason
621 * we keep these bitmaps!).
623 while (attempts > 0) {
624 if (window->counter >= IWL_RATE_MAX_WINDOW) {
625 /* remove earliest */
626 window->counter = IWL_RATE_MAX_WINDOW - 1;
628 if (window->data & mask) {
629 window->data &= ~mask;
630 window->success_counter--;
634 /* Increment frames-attempted counter */
637 /* Shift bitmap by one frame to throw away oldest history */
640 /* Mark the most recent #successes attempts as successful */
642 window->success_counter++;
650 /* Calculate current success ratio, avoid divide-by-0! */
651 if (window->counter > 0)
652 window->success_ratio = 128 * (100 * window->success_counter)
655 window->success_ratio = IWL_INVALID_VALUE;
657 fail_count = window->counter - window->success_counter;
659 /* Calculate average throughput, if we have enough history. */
660 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
661 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
662 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
664 window->average_tpt = IWL_INVALID_VALUE;
669 static int rs_collect_tx_data(struct iwl_mvm *mvm,
670 struct iwl_lq_sta *lq_sta,
671 struct iwl_scale_tbl_info *tbl,
672 int scale_index, int attempts, int successes,
675 struct iwl_rate_scale_data *window = NULL;
678 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
681 if (tbl->column != RS_COLUMN_INVALID) {
682 struct lq_sta_pers *pers = &lq_sta->pers;
684 pers->tx_stats[tbl->column][scale_index].total += attempts;
685 pers->tx_stats[tbl->column][scale_index].success += successes;
688 /* Select window for current tx bit rate */
689 window = &(tbl->win[scale_index]);
691 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
696 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
699 window = &tbl->tpc_win[reduced_txp];
700 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
704 /* Convert rs_rate object into ucode rate bitmask */
705 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
706 struct rs_rate *rate)
709 int index = rate->index;
711 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
712 RATE_MCS_ANT_ABC_MSK);
714 if (is_legacy(rate)) {
715 ucode_rate |= iwl_rates[index].plcp;
716 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
717 ucode_rate |= RATE_MCS_CCK_MSK;
722 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
723 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
724 index = IWL_LAST_HT_RATE;
726 ucode_rate |= RATE_MCS_HT_MSK;
728 if (is_ht_siso(rate))
729 ucode_rate |= iwl_rates[index].plcp_ht_siso;
730 else if (is_ht_mimo2(rate))
731 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
734 } else if (is_vht(rate)) {
735 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
736 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
737 index = IWL_LAST_VHT_RATE;
739 ucode_rate |= RATE_MCS_VHT_MSK;
740 if (is_vht_siso(rate))
741 ucode_rate |= iwl_rates[index].plcp_vht_siso;
742 else if (is_vht_mimo2(rate))
743 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
748 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
751 if (is_siso(rate) && rate->stbc) {
752 /* To enable STBC we need to set both a flag and ANT_AB */
753 ucode_rate |= RATE_MCS_ANT_AB_MSK;
754 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
757 ucode_rate |= rate->bw;
759 ucode_rate |= RATE_MCS_SGI_MSK;
761 ucode_rate |= RATE_MCS_LDPC_MSK;
766 /* Convert a ucode rate into an rs_rate object */
767 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
768 enum ieee80211_band band,
769 struct rs_rate *rate)
771 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
772 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
775 memset(rate, 0, sizeof(*rate));
776 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
778 if (rate->index == IWL_RATE_INVALID)
781 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
784 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
785 !(ucode_rate & RATE_MCS_VHT_MSK)) {
786 if (num_of_ant == 1) {
787 if (band == IEEE80211_BAND_5GHZ)
788 rate->type = LQ_LEGACY_A;
790 rate->type = LQ_LEGACY_G;
797 if (ucode_rate & RATE_MCS_SGI_MSK)
799 if (ucode_rate & RATE_MCS_LDPC_MSK)
801 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
804 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
806 if (ucode_rate & RATE_MCS_HT_MSK) {
807 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
808 RATE_HT_MCS_NSS_POS) + 1;
811 rate->type = LQ_HT_SISO;
812 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
813 } else if (nss == 2) {
814 rate->type = LQ_HT_MIMO2;
815 WARN_ON_ONCE(num_of_ant != 2);
819 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
820 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
821 RATE_VHT_MCS_NSS_POS) + 1;
824 rate->type = LQ_VHT_SISO;
825 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
826 } else if (nss == 2) {
827 rate->type = LQ_VHT_MIMO2;
828 WARN_ON_ONCE(num_of_ant != 2);
834 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
835 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
841 /* switch to another antenna/antennas and return 1 */
842 /* if no other valid antenna found, return 0 */
843 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
847 if (!rate->ant || rate->ant > ANT_ABC)
850 if (!rs_is_valid_ant(valid_ant, rate->ant))
853 new_ant_type = ant_toggle_lookup[rate->ant];
855 while ((new_ant_type != rate->ant) &&
856 !rs_is_valid_ant(valid_ant, new_ant_type))
857 new_ant_type = ant_toggle_lookup[new_ant_type];
859 if (new_ant_type == rate->ant)
862 rate->ant = new_ant_type;
867 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
868 struct rs_rate *rate)
871 return lq_sta->active_legacy_rate;
872 else if (is_siso(rate))
873 return lq_sta->active_siso_rate;
874 else if (is_mimo2(rate))
875 return lq_sta->active_mimo2_rate;
881 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
884 u8 high = IWL_RATE_INVALID;
885 u8 low = IWL_RATE_INVALID;
887 /* 802.11A or ht walks to the next literal adjacent rate in
889 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
893 /* Find the previous rate that is in the rate mask */
895 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
896 if (rate_mask & mask) {
902 /* Find the next rate that is in the rate mask */
904 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
905 if (rate_mask & mask) {
911 return (high << 8) | low;
915 while (low != IWL_RATE_INVALID) {
916 low = iwl_rates[low].prev_rs;
917 if (low == IWL_RATE_INVALID)
919 if (rate_mask & (1 << low))
924 while (high != IWL_RATE_INVALID) {
925 high = iwl_rates[high].next_rs;
926 if (high == IWL_RATE_INVALID)
928 if (rate_mask & (1 << high))
932 return (high << 8) | low;
935 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
936 struct rs_rate *rate)
938 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
941 /* Get the next supported lower rate in the current column.
942 * Return true if bottom rate in the current column was reached
944 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
945 struct rs_rate *rate)
950 struct iwl_mvm *mvm = lq_sta->pers.drv;
952 rate_mask = rs_get_supported_rates(lq_sta, rate);
953 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
955 low = high_low & 0xff;
957 /* Bottom rate of column reached */
958 if (low == IWL_RATE_INVALID)
965 /* Get the next rate to use following a column downgrade */
966 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
967 struct rs_rate *rate)
969 struct iwl_mvm *mvm = lq_sta->pers.drv;
971 if (is_legacy(rate)) {
972 /* No column to downgrade from Legacy */
974 } else if (is_siso(rate)) {
975 /* Downgrade to Legacy if we were in SISO */
976 if (lq_sta->band == IEEE80211_BAND_5GHZ)
977 rate->type = LQ_LEGACY_A;
979 rate->type = LQ_LEGACY_G;
981 rate->bw = RATE_MCS_CHAN_WIDTH_20;
983 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
984 rate->index > IWL_RATE_MCS_9_INDEX);
986 rate->index = rs_ht_to_legacy[rate->index];
989 /* Downgrade to SISO with same MCS if in MIMO */
990 rate->type = is_vht_mimo2(rate) ?
991 LQ_VHT_SISO : LQ_HT_SISO;
994 if (num_of_ant(rate->ant) > 1)
995 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
997 /* Relevant in both switching to SISO or Legacy */
1000 if (!rs_rate_supported(lq_sta, rate))
1001 rs_get_lower_rate_in_column(lq_sta, rate);
1004 /* Simple function to compare two rate scale table types */
1005 static inline bool rs_rate_match(struct rs_rate *a,
1011 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1013 ant_match = (a->ant == b->ant);
1015 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1019 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1021 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1022 return RATE_MCS_CHAN_WIDTH_40;
1023 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1024 return RATE_MCS_CHAN_WIDTH_80;
1025 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1026 return RATE_MCS_CHAN_WIDTH_160;
1028 return RATE_MCS_CHAN_WIDTH_20;
1031 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1033 u8 tid = IWL_MAX_TID_COUNT;
1035 if (ieee80211_is_data_qos(hdr->frame_control)) {
1036 u8 *qc = ieee80211_get_qos_ctl(hdr);
1040 if (unlikely(tid > IWL_MAX_TID_COUNT))
1041 tid = IWL_MAX_TID_COUNT;
1046 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1047 int tid, struct ieee80211_tx_info *info)
1052 struct iwl_lq_cmd *table;
1053 enum mac80211_rate_control_flags mac_flags;
1055 struct rs_rate rate;
1056 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1057 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1058 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1059 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1061 /* Treat uninitialized rate scaling data same as non-existing. */
1063 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1065 } else if (!lq_sta->pers.drv) {
1066 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1070 #ifdef CONFIG_MAC80211_DEBUGFS
1071 /* Disable last tx check if we are debugging with fixed rate */
1072 if (lq_sta->pers.dbg_fixed_rate) {
1073 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1077 /* This packet was aggregated but doesn't carry status info */
1078 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1079 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1083 * Ignore this Tx frame response if its initial rate doesn't match
1084 * that of latest Link Quality command. There may be stragglers
1085 * from a previous Link Quality command, but we're no longer interested
1086 * in those; they're either from the "active" mode while we're trying
1087 * to check "search" mode, or a prior "search" mode after we've moved
1088 * to a new "search" mode (which might become the new "active" mode).
1090 table = &lq_sta->lq;
1091 ucode_rate = le32_to_cpu(table->rs_table[0]);
1092 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1093 if (info->band == IEEE80211_BAND_5GHZ)
1094 rate.index -= IWL_FIRST_OFDM_RATE;
1095 mac_flags = info->status.rates[0].flags;
1096 mac_index = info->status.rates[0].idx;
1097 /* For HT packets, map MCS to PLCP */
1098 if (mac_flags & IEEE80211_TX_RC_MCS) {
1099 /* Remove # of streams */
1100 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1101 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1104 * mac80211 HT index is always zero-indexed; we need to move
1105 * HT OFDM rates after CCK rates in 2.4 GHz band
1107 if (info->band == IEEE80211_BAND_2GHZ)
1108 mac_index += IWL_FIRST_OFDM_RATE;
1109 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1110 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1111 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1115 if (time_after(jiffies,
1116 (unsigned long)(lq_sta->last_tx +
1117 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1120 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1121 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1122 ieee80211_stop_tx_ba_session(sta, t);
1124 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1127 lq_sta->last_tx = jiffies;
1129 /* Here we actually compare this rate to the latest LQ command */
1130 if ((mac_index < 0) ||
1131 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1132 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1133 (rate.ant != info->status.antenna) ||
1134 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1135 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1136 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1137 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1138 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1139 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1140 (rate.index != mac_index)) {
1142 "initial rate %d does not match %d (0x%x)\n",
1143 mac_index, rate.index, ucode_rate);
1145 * Since rates mis-match, the last LQ command may have failed.
1146 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1149 lq_sta->missed_rate_counter++;
1150 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1151 lq_sta->missed_rate_counter = 0;
1153 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1155 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1157 /* Regardless, ignore this status info for outdated rate */
1160 /* Rate did match, so reset the missed_rate_counter */
1161 lq_sta->missed_rate_counter = 0;
1163 if (!lq_sta->search_better_tbl) {
1164 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1165 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1167 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1168 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1171 if (WARN_ON_ONCE(!rs_rate_match(&rate, &curr_tbl->rate))) {
1173 "Neither active nor search matches tx rate\n");
1174 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1175 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1176 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1177 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1178 rs_dump_rate(mvm, &rate, "ACTUAL");
1181 * no matching table found, let's by-pass the data collection
1182 * and continue to perform rate scale to find the rate table
1184 rs_stay_in_table(lq_sta, true);
1189 * Updating the frame history depends on whether packets were
1192 * For aggregation, all packets were transmitted at the same rate, the
1193 * first index into rate scale table.
1195 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1196 /* ampdu_ack_len = 0 marks no BA was received. In this case
1197 * treat it as a single frame loss as we don't want the success
1198 * ratio to dip too quickly because a BA wasn't received
1200 if (info->status.ampdu_ack_len == 0)
1201 info->status.ampdu_len = 1;
1203 ucode_rate = le32_to_cpu(table->rs_table[0]);
1204 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1205 rs_collect_tx_data(mvm, lq_sta, curr_tbl, rate.index,
1206 info->status.ampdu_len,
1207 info->status.ampdu_ack_len,
1210 /* Update success/fail counts if not searching for new mode */
1211 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1212 lq_sta->total_success += info->status.ampdu_ack_len;
1213 lq_sta->total_failed += (info->status.ampdu_len -
1214 info->status.ampdu_ack_len);
1218 * For legacy, update frame history with for each Tx retry.
1220 retries = info->status.rates[0].count - 1;
1221 /* HW doesn't send more than 15 retries */
1222 retries = min(retries, 15);
1224 /* The last transmission may have been successful */
1225 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1226 /* Collect data for each rate used during failed TX attempts */
1227 for (i = 0; i <= retries; ++i) {
1228 ucode_rate = le32_to_cpu(table->rs_table[i]);
1229 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1231 * Only collect stats if retried rate is in the same RS
1232 * table as active/search.
1234 if (rs_rate_match(&rate, &curr_tbl->rate))
1236 else if (rs_rate_match(&rate, &other_tbl->rate))
1237 tmp_tbl = other_tbl;
1241 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, rate.index, 1,
1242 i < retries ? 0 : legacy_success,
1246 /* Update success/fail counts if not searching for new mode */
1247 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1248 lq_sta->total_success += legacy_success;
1249 lq_sta->total_failed += retries + (1 - legacy_success);
1252 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1253 lq_sta->last_rate_n_flags = ucode_rate;
1254 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1256 /* See if there's a better rate or modulation mode to try. */
1257 if (sta->supp_rates[info->band])
1258 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1262 * mac80211 sends us Tx status
1264 static void rs_mac80211_tx_status(void *mvm_r,
1265 struct ieee80211_supported_band *sband,
1266 struct ieee80211_sta *sta, void *priv_sta,
1267 struct sk_buff *skb)
1269 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1270 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1271 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1272 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1274 if (!ieee80211_is_data(hdr->frame_control) ||
1275 info->flags & IEEE80211_TX_CTL_NO_ACK)
1278 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1282 * Begin a period of staying with a selected modulation mode.
1283 * Set "stay_in_tbl" flag to prevent any mode switches.
1284 * Set frame tx success limits according to legacy vs. high-throughput,
1285 * and reset overall (spanning all rates) tx success history statistics.
1286 * These control how long we stay using same modulation mode before
1287 * searching for a new mode.
1289 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1290 struct iwl_lq_sta *lq_sta)
1292 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1293 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1295 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1296 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1297 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1299 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1300 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1301 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1303 lq_sta->table_count = 0;
1304 lq_sta->total_failed = 0;
1305 lq_sta->total_success = 0;
1306 lq_sta->flush_timer = jiffies;
1307 lq_sta->visited_columns = 0;
1310 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1313 return find_last_bit(&rate_mask, BITS_PER_LONG);
1314 return IWL_RATE_INVALID;
1317 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1318 const struct rs_tx_column *column)
1320 switch (column->mode) {
1322 return lq_sta->max_legacy_rate_idx;
1324 return lq_sta->max_siso_rate_idx;
1326 return lq_sta->max_mimo2_rate_idx;
1331 return lq_sta->max_legacy_rate_idx;
1334 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1335 const struct rs_tx_column *column,
1338 /* Used to choose among HT tables */
1339 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1341 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1342 column->mode != RS_SISO &&
1343 column->mode != RS_MIMO2))
1344 return expected_tpt_legacy;
1346 /* Legacy rates have only one table */
1347 if (column->mode == RS_LEGACY)
1348 return expected_tpt_legacy;
1350 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1351 /* Choose among many HT tables depending on number of streams
1352 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1354 if (column->mode == RS_SISO) {
1356 case RATE_MCS_CHAN_WIDTH_20:
1357 ht_tbl_pointer = expected_tpt_siso_20MHz;
1359 case RATE_MCS_CHAN_WIDTH_40:
1360 ht_tbl_pointer = expected_tpt_siso_40MHz;
1362 case RATE_MCS_CHAN_WIDTH_80:
1363 ht_tbl_pointer = expected_tpt_siso_80MHz;
1368 } else if (column->mode == RS_MIMO2) {
1370 case RATE_MCS_CHAN_WIDTH_20:
1371 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1373 case RATE_MCS_CHAN_WIDTH_40:
1374 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1376 case RATE_MCS_CHAN_WIDTH_80:
1377 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1386 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1387 return ht_tbl_pointer[0];
1388 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1389 return ht_tbl_pointer[1];
1390 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1391 return ht_tbl_pointer[2];
1393 return ht_tbl_pointer[3];
1396 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1397 struct iwl_scale_tbl_info *tbl)
1399 struct rs_rate *rate = &tbl->rate;
1400 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1402 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1405 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1406 struct iwl_lq_sta *lq_sta,
1407 struct iwl_scale_tbl_info *tbl, /* "search" */
1408 unsigned long rate_mask, s8 index)
1410 struct iwl_scale_tbl_info *active_tbl =
1411 &(lq_sta->lq_info[lq_sta->active_tbl]);
1412 s32 success_ratio = active_tbl->win[index].success_ratio;
1413 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1414 const u16 *tpt_tbl = tbl->expected_tpt;
1419 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1420 target_tpt = 100 * expected_current_tpt;
1422 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1423 success_ratio, target_tpt);
1425 target_tpt = lq_sta->last_tpt;
1427 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1428 success_ratio, target_tpt);
1431 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1433 while (rate_idx != IWL_RATE_INVALID) {
1434 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1437 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1440 rate_idx = (high_low >> 8) & 0xff;
1443 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1444 rate_idx, target_tpt,
1445 rate_idx != IWL_RATE_INVALID ?
1446 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1451 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1453 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1454 return RATE_MCS_CHAN_WIDTH_80;
1455 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1456 return RATE_MCS_CHAN_WIDTH_40;
1458 return RATE_MCS_CHAN_WIDTH_20;
1462 * Check whether we should continue using same modulation mode, or
1463 * begin search for a new mode, based on:
1464 * 1) # tx successes or failures while using this mode
1465 * 2) # times calling this function
1466 * 3) elapsed time in this mode (not used, for now)
1468 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1470 struct iwl_scale_tbl_info *tbl;
1472 int flush_interval_passed = 0;
1473 struct iwl_mvm *mvm;
1475 mvm = lq_sta->pers.drv;
1476 active_tbl = lq_sta->active_tbl;
1478 tbl = &(lq_sta->lq_info[active_tbl]);
1480 /* If we've been disallowing search, see if we should now allow it */
1481 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1482 /* Elapsed time using current modulation mode */
1483 if (lq_sta->flush_timer)
1484 flush_interval_passed =
1486 (unsigned long)(lq_sta->flush_timer +
1487 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1490 * Check if we should allow search for new modulation mode.
1491 * If many frames have failed or succeeded, or we've used
1492 * this same modulation for a long time, allow search, and
1493 * reset history stats that keep track of whether we should
1494 * allow a new search. Also (below) reset all bitmaps and
1495 * stats in active history.
1498 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1499 (lq_sta->total_success > lq_sta->max_success_limit) ||
1500 ((!lq_sta->search_better_tbl) &&
1501 (lq_sta->flush_timer) && (flush_interval_passed))) {
1503 "LQ: stay is expired %d %d %d\n",
1504 lq_sta->total_failed,
1505 lq_sta->total_success,
1506 flush_interval_passed);
1508 /* Allow search for new mode */
1509 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1511 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1512 lq_sta->total_failed = 0;
1513 lq_sta->total_success = 0;
1514 lq_sta->flush_timer = 0;
1515 /* mark the current column as visited */
1516 lq_sta->visited_columns = BIT(tbl->column);
1518 * Else if we've used this modulation mode enough repetitions
1519 * (regardless of elapsed time or success/failure), reset
1520 * history bitmaps and rate-specific stats for all rates in
1524 lq_sta->table_count++;
1525 if (lq_sta->table_count >=
1526 lq_sta->table_count_limit) {
1527 lq_sta->table_count = 0;
1530 "LQ: stay in table clear win\n");
1531 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1535 /* If transitioning to allow "search", reset all history
1536 * bitmaps and stats in active table (this will become the new
1537 * "search" table). */
1538 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1539 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1545 * setup rate table in uCode
1547 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1548 struct ieee80211_sta *sta,
1549 struct iwl_lq_sta *lq_sta,
1550 struct rs_rate *rate)
1552 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1553 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1556 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1557 struct iwl_lq_sta *lq_sta,
1558 struct ieee80211_sta *sta,
1559 struct iwl_scale_tbl_info *tbl)
1562 enum rs_column next_col_id;
1563 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1564 const struct rs_tx_column *next_col;
1565 allow_column_func_t allow_func;
1566 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1567 const u16 *expected_tpt_tbl;
1568 u16 tpt, max_expected_tpt;
1570 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1571 next_col_id = curr_col->next_columns[i];
1573 if (next_col_id == RS_COLUMN_INVALID)
1576 if (lq_sta->visited_columns & BIT(next_col_id)) {
1577 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1582 next_col = &rs_tx_columns[next_col_id];
1584 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1586 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1587 next_col_id, valid_ants, next_col->ant);
1591 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1592 allow_func = next_col->checks[j];
1593 if (allow_func && !allow_func(mvm, sta, tbl))
1597 if (j != MAX_COLUMN_CHECKS) {
1599 "Skip column %d: not allowed (check %d failed)\n",
1605 tpt = lq_sta->last_tpt / 100;
1606 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1607 rs_bw_from_sta_bw(sta));
1608 if (WARN_ON_ONCE(!expected_tpt_tbl))
1611 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1612 if (max_rate == IWL_RATE_INVALID) {
1614 "Skip column %d: no rate is allowed in this column\n",
1619 max_expected_tpt = expected_tpt_tbl[max_rate];
1620 if (tpt >= max_expected_tpt) {
1622 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1623 next_col_id, max_expected_tpt, tpt);
1628 "Found potential column %d. Max expected %d current %d\n",
1629 next_col_id, max_expected_tpt, tpt);
1633 if (i == MAX_NEXT_COLUMNS)
1634 return RS_COLUMN_INVALID;
1639 static int rs_switch_to_column(struct iwl_mvm *mvm,
1640 struct iwl_lq_sta *lq_sta,
1641 struct ieee80211_sta *sta,
1642 enum rs_column col_id)
1644 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1645 struct iwl_scale_tbl_info *search_tbl =
1646 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1647 struct rs_rate *rate = &search_tbl->rate;
1648 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1649 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1650 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1651 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1652 unsigned long rate_mask = 0;
1655 memcpy(search_tbl, tbl, sz);
1657 rate->sgi = column->sgi;
1658 rate->ant = column->ant;
1660 if (column->mode == RS_LEGACY) {
1661 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1662 rate->type = LQ_LEGACY_A;
1664 rate->type = LQ_LEGACY_G;
1666 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1668 rate_mask = lq_sta->active_legacy_rate;
1669 } else if (column->mode == RS_SISO) {
1670 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1671 rate_mask = lq_sta->active_siso_rate;
1672 } else if (column->mode == RS_MIMO2) {
1673 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1674 rate_mask = lq_sta->active_mimo2_rate;
1676 WARN_ON_ONCE("Bad column mode");
1679 if (column->mode != RS_LEGACY) {
1680 rate->bw = rs_bw_from_sta_bw(sta);
1681 rate->ldpc = lq_sta->ldpc;
1684 search_tbl->column = col_id;
1685 rs_set_expected_tpt_table(lq_sta, search_tbl);
1687 lq_sta->visited_columns |= BIT(col_id);
1689 /* Get the best matching rate if we're changing modes. e.g.
1690 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1692 if (curr_column->mode != column->mode) {
1693 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1694 rate_mask, rate->index);
1696 if ((rate_idx == IWL_RATE_INVALID) ||
1697 !(BIT(rate_idx) & rate_mask)) {
1699 "can not switch with index %d"
1701 rate_idx, rate_mask);
1706 rate->index = rate_idx;
1709 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1710 col_id, rate->index);
1715 rate->type = LQ_NONE;
1719 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1720 struct iwl_scale_tbl_info *tbl,
1721 s32 sr, int low, int high,
1723 int low_tpt, int high_tpt)
1725 enum rs_action action = RS_ACTION_STAY;
1727 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1728 (current_tpt == 0)) {
1730 "Decrease rate because of low SR\n");
1731 return RS_ACTION_DOWNSCALE;
1734 if ((low_tpt == IWL_INVALID_VALUE) &&
1735 (high_tpt == IWL_INVALID_VALUE) &&
1736 (high != IWL_RATE_INVALID)) {
1738 "No data about high/low rates. Increase rate\n");
1739 return RS_ACTION_UPSCALE;
1742 if ((high_tpt == IWL_INVALID_VALUE) &&
1743 (high != IWL_RATE_INVALID) &&
1744 (low_tpt != IWL_INVALID_VALUE) &&
1745 (low_tpt < current_tpt)) {
1747 "No data about high rate and low rate is worse. Increase rate\n");
1748 return RS_ACTION_UPSCALE;
1751 if ((high_tpt != IWL_INVALID_VALUE) &&
1752 (high_tpt > current_tpt)) {
1754 "Higher rate is better. Increate rate\n");
1755 return RS_ACTION_UPSCALE;
1758 if ((low_tpt != IWL_INVALID_VALUE) &&
1759 (high_tpt != IWL_INVALID_VALUE) &&
1760 (low_tpt < current_tpt) &&
1761 (high_tpt < current_tpt)) {
1763 "Both high and low are worse. Maintain rate\n");
1764 return RS_ACTION_STAY;
1767 if ((low_tpt != IWL_INVALID_VALUE) &&
1768 (low_tpt > current_tpt)) {
1770 "Lower rate is better\n");
1771 action = RS_ACTION_DOWNSCALE;
1775 if ((low_tpt == IWL_INVALID_VALUE) &&
1776 (low != IWL_RATE_INVALID)) {
1778 "No data about lower rate\n");
1779 action = RS_ACTION_DOWNSCALE;
1783 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1786 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1787 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1789 "SR is above NO DECREASE. Avoid downscale\n");
1790 action = RS_ACTION_STAY;
1791 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1793 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1794 action = RS_ACTION_STAY;
1796 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1803 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1804 struct iwl_lq_sta *lq_sta)
1806 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1807 * supports STBC of at least 1*SS
1809 if (!lq_sta->stbc_capable)
1812 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1818 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1819 int *weaker, int *stronger)
1821 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1822 if (*weaker > TPC_MAX_REDUCTION)
1823 *weaker = TPC_INVALID;
1825 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1827 *stronger = TPC_INVALID;
1830 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1831 struct rs_rate *rate, enum ieee80211_band band)
1833 int index = rate->index;
1834 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1835 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1838 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1839 cam, sta_ps_disabled);
1841 * allow tpc only if power management is enabled, or bt coex
1842 * activity grade allows it and we are on 2.4Ghz.
1844 if ((cam || sta_ps_disabled) &&
1845 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1848 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1849 if (is_legacy(rate))
1850 return index == IWL_RATE_54M_INDEX;
1852 return index == IWL_RATE_MCS_7_INDEX;
1854 return index == IWL_RATE_MCS_7_INDEX ||
1855 index == IWL_RATE_MCS_8_INDEX ||
1856 index == IWL_RATE_MCS_9_INDEX;
1864 TPC_ACTION_DECREASE,
1865 TPC_ACTION_INCREASE,
1866 TPC_ACTION_NO_RESTIRCTION,
1869 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1870 s32 sr, int weak, int strong,
1872 int weak_tpt, int strong_tpt)
1874 /* stay until we have valid tpt */
1875 if (current_tpt == IWL_INVALID_VALUE) {
1876 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1877 return TPC_ACTION_STAY;
1880 /* Too many failures, increase txp */
1881 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1883 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1884 return TPC_ACTION_NO_RESTIRCTION;
1887 /* try decreasing first if applicable */
1888 if (weak != TPC_INVALID) {
1889 if (weak_tpt == IWL_INVALID_VALUE &&
1890 (strong_tpt == IWL_INVALID_VALUE ||
1891 current_tpt >= strong_tpt)) {
1893 "no weak txp measurement. decrease txp\n");
1894 return TPC_ACTION_DECREASE;
1897 if (weak_tpt > current_tpt) {
1899 "lower txp has better tpt. decrease txp\n");
1900 return TPC_ACTION_DECREASE;
1904 /* next, increase if needed */
1905 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1906 strong != TPC_INVALID) {
1907 if (weak_tpt == IWL_INVALID_VALUE &&
1908 strong_tpt != IWL_INVALID_VALUE &&
1909 current_tpt < strong_tpt) {
1911 "higher txp has better tpt. increase txp\n");
1912 return TPC_ACTION_INCREASE;
1915 if (weak_tpt < current_tpt &&
1916 (strong_tpt == IWL_INVALID_VALUE ||
1917 strong_tpt > current_tpt)) {
1919 "lower txp has worse tpt. increase txp\n");
1920 return TPC_ACTION_INCREASE;
1924 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1925 return TPC_ACTION_STAY;
1928 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1929 struct ieee80211_sta *sta,
1930 struct iwl_lq_sta *lq_sta,
1931 struct iwl_scale_tbl_info *tbl)
1933 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1934 struct ieee80211_vif *vif = mvm_sta->vif;
1935 struct ieee80211_chanctx_conf *chanctx_conf;
1936 enum ieee80211_band band;
1937 struct iwl_rate_scale_data *window;
1938 struct rs_rate *rate = &tbl->rate;
1939 enum tpc_action action;
1941 u8 cur = lq_sta->lq.reduced_tpc;
1944 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1946 #ifdef CONFIG_MAC80211_DEBUGFS
1947 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1948 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1949 lq_sta->pers.dbg_fixed_txp_reduction);
1950 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1951 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1956 chanctx_conf = rcu_dereference(vif->chanctx_conf);
1957 if (WARN_ON(!chanctx_conf))
1958 band = IEEE80211_NUM_BANDS;
1960 band = chanctx_conf->def.chan->band;
1963 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1965 "tpc is not allowed. remove txp restrictions\n");
1966 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1967 return cur != TPC_NO_REDUCTION;
1970 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1972 /* Collect measured throughputs for current and adjacent rates */
1973 window = tbl->tpc_win;
1974 sr = window[cur].success_ratio;
1975 current_tpt = window[cur].average_tpt;
1976 if (weak != TPC_INVALID)
1977 weak_tpt = window[weak].average_tpt;
1978 if (strong != TPC_INVALID)
1979 strong_tpt = window[strong].average_tpt;
1982 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1983 cur, current_tpt, sr, weak, strong,
1984 weak_tpt, strong_tpt);
1986 action = rs_get_tpc_action(mvm, sr, weak, strong,
1987 current_tpt, weak_tpt, strong_tpt);
1989 /* override actions if we are on the edge */
1990 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1991 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
1992 action = TPC_ACTION_STAY;
1993 } else if (strong == TPC_INVALID &&
1994 (action == TPC_ACTION_INCREASE ||
1995 action == TPC_ACTION_NO_RESTIRCTION)) {
1996 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
1997 action = TPC_ACTION_STAY;
2001 case TPC_ACTION_DECREASE:
2002 lq_sta->lq.reduced_tpc = weak;
2004 case TPC_ACTION_INCREASE:
2005 lq_sta->lq.reduced_tpc = strong;
2007 case TPC_ACTION_NO_RESTIRCTION:
2008 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2010 case TPC_ACTION_STAY:
2018 * Do rate scaling and search for new modulation mode.
2020 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2021 struct ieee80211_sta *sta,
2022 struct iwl_lq_sta *lq_sta,
2025 int low = IWL_RATE_INVALID;
2026 int high = IWL_RATE_INVALID;
2028 struct iwl_rate_scale_data *window = NULL;
2029 int current_tpt = IWL_INVALID_VALUE;
2030 int low_tpt = IWL_INVALID_VALUE;
2031 int high_tpt = IWL_INVALID_VALUE;
2033 enum rs_action scale_action = RS_ACTION_STAY;
2036 struct iwl_scale_tbl_info *tbl, *tbl1;
2041 u8 prev_agg = lq_sta->is_agg;
2042 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2043 struct iwl_mvm_tid_data *tid_data;
2044 struct rs_rate *rate;
2046 lq_sta->is_agg = !!sta_priv->agg_tids;
2049 * Select rate-scale / modulation-mode table to work with in
2050 * the rest of this function: "search" if searching for better
2051 * modulation mode, or "active" if doing rate scaling within a mode.
2053 if (!lq_sta->search_better_tbl)
2054 active_tbl = lq_sta->active_tbl;
2056 active_tbl = 1 - lq_sta->active_tbl;
2058 tbl = &(lq_sta->lq_info[active_tbl]);
2061 if (prev_agg != lq_sta->is_agg) {
2063 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2064 prev_agg, lq_sta->is_agg);
2065 rs_set_expected_tpt_table(lq_sta, tbl);
2066 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2069 /* current tx rate */
2070 index = lq_sta->last_txrate_idx;
2072 /* rates available for this association, and for modulation mode */
2073 rate_mask = rs_get_supported_rates(lq_sta, rate);
2075 if (!(BIT(index) & rate_mask)) {
2076 IWL_ERR(mvm, "Current Rate is not valid\n");
2077 if (lq_sta->search_better_tbl) {
2078 /* revert to active table if search table is not valid*/
2079 rate->type = LQ_NONE;
2080 lq_sta->search_better_tbl = 0;
2081 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2082 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2087 /* Get expected throughput table and history window for current rate */
2088 if (!tbl->expected_tpt) {
2089 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2093 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2094 window = &(tbl->win[index]);
2097 * If there is not enough history to calculate actual average
2098 * throughput, keep analyzing results of more tx frames, without
2099 * changing rate or mode (bypass most of the rest of this function).
2100 * Set up new rate table in uCode only if old rate is not supported
2101 * in current association (use new rate found above).
2103 fail_count = window->counter - window->success_counter;
2104 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2105 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2107 "(%s: %d): Test Window: succ %d total %d\n",
2108 rs_pretty_lq_type(rate->type),
2109 index, window->success_counter, window->counter);
2111 /* Can't calculate this yet; not enough history */
2112 window->average_tpt = IWL_INVALID_VALUE;
2114 /* Should we stay with this modulation mode,
2115 * or search for a new one? */
2116 rs_stay_in_table(lq_sta, false);
2120 /* Else we have enough samples; calculate estimate of
2121 * actual average throughput */
2122 if (window->average_tpt != ((window->success_ratio *
2123 tbl->expected_tpt[index] + 64) / 128)) {
2124 window->average_tpt = ((window->success_ratio *
2125 tbl->expected_tpt[index] + 64) / 128);
2128 /* If we are searching for better modulation mode, check success. */
2129 if (lq_sta->search_better_tbl) {
2130 /* If good success, continue using the "search" mode;
2131 * no need to send new link quality command, since we're
2132 * continuing to use the setup that we've been trying. */
2133 if (window->average_tpt > lq_sta->last_tpt) {
2135 "SWITCHING TO NEW TABLE SR: %d "
2136 "cur-tpt %d old-tpt %d\n",
2137 window->success_ratio,
2138 window->average_tpt,
2141 /* Swap tables; "search" becomes "active" */
2142 lq_sta->active_tbl = active_tbl;
2143 current_tpt = window->average_tpt;
2144 /* Else poor success; go back to mode in "active" table */
2147 "GOING BACK TO THE OLD TABLE: SR %d "
2148 "cur-tpt %d old-tpt %d\n",
2149 window->success_ratio,
2150 window->average_tpt,
2153 /* Nullify "search" table */
2154 rate->type = LQ_NONE;
2156 /* Revert to "active" table */
2157 active_tbl = lq_sta->active_tbl;
2158 tbl = &(lq_sta->lq_info[active_tbl]);
2160 /* Revert to "active" rate and throughput info */
2161 index = tbl->rate.index;
2162 current_tpt = lq_sta->last_tpt;
2164 /* Need to set up a new rate table in uCode */
2168 /* Either way, we've made a decision; modulation mode
2169 * search is done, allow rate adjustment next time. */
2170 lq_sta->search_better_tbl = 0;
2171 done_search = 1; /* Don't switch modes below! */
2175 /* (Else) not in search of better modulation mode, try for better
2176 * starting rate, while staying in this mode. */
2177 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2178 low = high_low & 0xff;
2179 high = (high_low >> 8) & 0xff;
2181 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2183 sr = window->success_ratio;
2185 /* Collect measured throughputs for current and adjacent rates */
2186 current_tpt = window->average_tpt;
2187 if (low != IWL_RATE_INVALID)
2188 low_tpt = tbl->win[low].average_tpt;
2189 if (high != IWL_RATE_INVALID)
2190 high_tpt = tbl->win[high].average_tpt;
2193 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2194 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2195 low, high, low_tpt, high_tpt);
2197 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2198 current_tpt, low_tpt, high_tpt);
2200 /* Force a search in case BT doesn't like us being in MIMO */
2201 if (is_mimo(rate) &&
2202 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2204 "BT Coex forbids MIMO. Search for new config\n");
2205 rs_stay_in_table(lq_sta, true);
2209 switch (scale_action) {
2210 case RS_ACTION_DOWNSCALE:
2211 /* Decrease starting rate, update uCode's rate table */
2212 if (low != IWL_RATE_INVALID) {
2217 "At the bottom rate. Can't decrease\n");
2221 case RS_ACTION_UPSCALE:
2222 /* Increase starting rate, update uCode's rate table */
2223 if (high != IWL_RATE_INVALID) {
2228 "At the top rate. Can't increase\n");
2232 case RS_ACTION_STAY:
2234 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2235 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2242 /* Replace uCode's rate table for the destination station. */
2244 tbl->rate.index = index;
2245 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2248 rs_stay_in_table(lq_sta, false);
2251 * Search for new modulation mode if we're:
2252 * 1) Not changing rates right now
2253 * 2) Not just finishing up a search
2254 * 3) Allowing a new search
2256 if (!update_lq && !done_search &&
2257 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2258 && window->counter) {
2259 enum rs_column next_column;
2261 /* Save current throughput to compare with "search" throughput*/
2262 lq_sta->last_tpt = current_tpt;
2265 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2266 update_lq, done_search, lq_sta->rs_state,
2269 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2270 if (next_column != RS_COLUMN_INVALID) {
2271 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2274 lq_sta->search_better_tbl = 1;
2277 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2278 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2281 /* If new "search" mode was selected, set up in uCode table */
2282 if (lq_sta->search_better_tbl) {
2283 /* Access the "search" table, clear its history. */
2284 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2285 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2287 /* Use new "search" start rate */
2288 index = tbl->rate.index;
2290 rs_dump_rate(mvm, &tbl->rate,
2291 "Switch to SEARCH TABLE:");
2292 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2293 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2299 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2300 /* If the "active" (non-search) mode was legacy,
2301 * and we've tried switching antennas,
2302 * but we haven't been able to try HT modes (not available),
2303 * stay with best antenna legacy modulation for a while
2304 * before next round of mode comparisons. */
2305 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2306 if (is_legacy(&tbl1->rate)) {
2307 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2309 if (tid != IWL_MAX_TID_COUNT) {
2310 tid_data = &sta_priv->tid_data[tid];
2311 if (tid_data->state != IWL_AGG_OFF) {
2313 "Stop aggregation on tid %d\n",
2315 ieee80211_stop_tx_ba_session(sta, tid);
2318 rs_set_stay_in_table(mvm, 1, lq_sta);
2320 /* If we're in an HT mode, and all 3 mode switch actions
2321 * have been tried and compared, stay in this best modulation
2322 * mode for a while before next round of mode comparisons. */
2323 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2324 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2325 (tid != IWL_MAX_TID_COUNT)) {
2326 tid_data = &sta_priv->tid_data[tid];
2327 if (tid_data->state == IWL_AGG_OFF) {
2329 "try to aggregate tid %d\n",
2331 rs_tl_turn_on_agg(mvm, tid,
2335 rs_set_stay_in_table(mvm, 0, lq_sta);
2340 lq_sta->last_txrate_idx = index;
2343 struct rs_init_rate_info {
2348 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2349 { -60, IWL_RATE_54M_INDEX },
2350 { -64, IWL_RATE_48M_INDEX },
2351 { -68, IWL_RATE_36M_INDEX },
2352 { -80, IWL_RATE_24M_INDEX },
2353 { -84, IWL_RATE_18M_INDEX },
2354 { -85, IWL_RATE_12M_INDEX },
2355 { -86, IWL_RATE_11M_INDEX },
2356 { -88, IWL_RATE_5M_INDEX },
2357 { -90, IWL_RATE_2M_INDEX },
2358 { S8_MIN, IWL_RATE_1M_INDEX },
2361 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2362 { -60, IWL_RATE_54M_INDEX },
2363 { -64, IWL_RATE_48M_INDEX },
2364 { -72, IWL_RATE_36M_INDEX },
2365 { -80, IWL_RATE_24M_INDEX },
2366 { -84, IWL_RATE_18M_INDEX },
2367 { -85, IWL_RATE_12M_INDEX },
2368 { -87, IWL_RATE_9M_INDEX },
2369 { S8_MIN, IWL_RATE_6M_INDEX },
2372 /* Choose an initial legacy rate and antenna to use based on the RSSI
2375 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2376 struct iwl_lq_sta *lq_sta,
2377 enum ieee80211_band band,
2378 struct rs_rate *rate)
2381 s8 best_rssi = S8_MIN;
2382 u8 best_ant = ANT_NONE;
2383 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2384 const struct rs_init_rate_info *initial_rates;
2386 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2387 if (!(lq_sta->pers.chains & BIT(i)))
2390 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2391 best_rssi = lq_sta->pers.chain_signal[i];
2396 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2397 rs_pretty_ant(best_ant), best_rssi);
2399 if (best_ant != ANT_A && best_ant != ANT_B)
2400 rate->ant = first_antenna(valid_tx_ant);
2402 rate->ant = best_ant;
2406 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2408 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2411 if (band == IEEE80211_BAND_5GHZ) {
2412 rate->type = LQ_LEGACY_A;
2413 initial_rates = rs_init_rates_5ghz;
2414 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2416 rate->type = LQ_LEGACY_G;
2417 initial_rates = rs_init_rates_24ghz;
2418 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2421 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2422 for (i = 0; i < nentries; i++) {
2423 int rate_idx = initial_rates[i].rate_idx;
2424 if ((best_rssi >= initial_rates[i].rssi) &&
2425 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2426 rate->index = rate_idx;
2432 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2433 rs_pretty_ant(rate->ant));
2436 /* Save info about RSSI of last Rx */
2437 void rs_update_last_rssi(struct iwl_mvm *mvm,
2438 struct iwl_lq_sta *lq_sta,
2439 struct ieee80211_rx_status *rx_status)
2441 lq_sta->pers.chains = rx_status->chains;
2442 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2443 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2444 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2448 * rs_initialize_lq - Initialize a station's hardware rate table
2450 * The uCode's station table contains a table of fallback rates
2451 * for automatic fallback during transmission.
2453 * NOTE: This sets up a default set of values. These will be replaced later
2454 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2457 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2458 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2459 * which requires station table entry to exist).
2461 static void rs_initialize_lq(struct iwl_mvm *mvm,
2462 struct ieee80211_sta *sta,
2463 struct iwl_lq_sta *lq_sta,
2464 enum ieee80211_band band,
2467 struct iwl_scale_tbl_info *tbl;
2468 struct rs_rate *rate;
2471 if (!sta || !lq_sta)
2474 if (!lq_sta->search_better_tbl)
2475 active_tbl = lq_sta->active_tbl;
2477 active_tbl = 1 - lq_sta->active_tbl;
2479 tbl = &(lq_sta->lq_info[active_tbl]);
2482 rs_get_initial_rate(mvm, lq_sta, band, rate);
2483 lq_sta->last_txrate_idx = rate->index;
2485 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2486 if (rate->ant == ANT_A)
2487 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2489 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2491 rs_set_expected_tpt_table(lq_sta, tbl);
2492 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2493 /* TODO restore station should remember the lq cmd */
2494 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2497 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2498 struct ieee80211_tx_rate_control *txrc)
2500 struct sk_buff *skb = txrc->skb;
2501 struct iwl_op_mode *op_mode __maybe_unused =
2502 (struct iwl_op_mode *)mvm_r;
2503 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2504 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2505 struct iwl_lq_sta *lq_sta = mvm_sta;
2507 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2509 /* Treat uninitialized rate scaling data same as non-existing. */
2510 if (lq_sta && !lq_sta->pers.drv) {
2511 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2515 /* Send management frames and NO_ACK data using lowest rate. */
2516 if (rate_control_send_low(sta, mvm_sta, txrc))
2519 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2520 info->band, &info->control.rates[0]);
2522 info->control.rates[0].count = 1;
2525 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2528 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2529 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2530 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2531 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2533 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2535 lq_sta->pers.drv = mvm;
2536 #ifdef CONFIG_MAC80211_DEBUGFS
2537 lq_sta->pers.dbg_fixed_rate = 0;
2538 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2540 lq_sta->pers.chains = 0;
2541 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2543 return &sta_priv->lq_sta;
2546 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2549 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2550 (0x3 << (2 * (nss - 1)));
2551 rx_mcs >>= (2 * (nss - 1));
2553 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2554 return IWL_RATE_MCS_7_INDEX;
2555 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2556 return IWL_RATE_MCS_8_INDEX;
2557 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2558 return IWL_RATE_MCS_9_INDEX;
2560 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2564 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2565 struct ieee80211_sta_vht_cap *vht_cap,
2566 struct iwl_lq_sta *lq_sta)
2569 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2571 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2572 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2573 if (i == IWL_RATE_9M_INDEX)
2576 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2577 if (i == IWL_RATE_MCS_9_INDEX &&
2578 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2581 lq_sta->active_siso_rate |= BIT(i);
2585 if (sta->rx_nss < 2)
2588 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2589 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2590 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2591 if (i == IWL_RATE_9M_INDEX)
2594 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2595 if (i == IWL_RATE_MCS_9_INDEX &&
2596 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2599 lq_sta->active_mimo2_rate |= BIT(i);
2604 static void rs_ht_init(struct iwl_mvm *mvm,
2605 struct ieee80211_sta *sta,
2606 struct iwl_lq_sta *lq_sta,
2607 struct ieee80211_sta_ht_cap *ht_cap)
2609 /* active_siso_rate mask includes 9 MBits (bit 5),
2610 * and CCK (bits 0-3), supp_rates[] does not;
2611 * shift to convert format, force 9 MBits off.
2613 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2614 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2615 lq_sta->active_siso_rate &= ~((u16)0x2);
2616 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2618 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2619 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2620 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2621 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2623 if (mvm->cfg->ht_params->ldpc &&
2624 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2625 lq_sta->ldpc = true;
2627 if (mvm->cfg->ht_params->stbc &&
2628 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2629 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2630 lq_sta->stbc_capable = true;
2632 lq_sta->is_vht = false;
2635 static void rs_vht_init(struct iwl_mvm *mvm,
2636 struct ieee80211_sta *sta,
2637 struct iwl_lq_sta *lq_sta,
2638 struct ieee80211_sta_vht_cap *vht_cap)
2640 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2642 if (mvm->cfg->ht_params->ldpc &&
2643 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2644 lq_sta->ldpc = true;
2646 if (mvm->cfg->ht_params->stbc &&
2647 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2648 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2649 lq_sta->stbc_capable = true;
2651 if ((mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2652 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2653 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2654 lq_sta->bfer_capable = true;
2656 lq_sta->is_vht = true;
2659 #ifdef CONFIG_IWLWIFI_DEBUGFS
2660 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2662 spin_lock_bh(&mvm->drv_stats_lock);
2663 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2664 spin_unlock_bh(&mvm->drv_stats_lock);
2667 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2669 u8 nss = 0, mcs = 0;
2671 spin_lock(&mvm->drv_stats_lock);
2674 mvm->drv_rx_stats.agg_frames++;
2676 mvm->drv_rx_stats.success_frames++;
2678 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2679 case RATE_MCS_CHAN_WIDTH_20:
2680 mvm->drv_rx_stats.bw_20_frames++;
2682 case RATE_MCS_CHAN_WIDTH_40:
2683 mvm->drv_rx_stats.bw_40_frames++;
2685 case RATE_MCS_CHAN_WIDTH_80:
2686 mvm->drv_rx_stats.bw_80_frames++;
2689 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2692 if (rate & RATE_MCS_HT_MSK) {
2693 mvm->drv_rx_stats.ht_frames++;
2694 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2695 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2696 } else if (rate & RATE_MCS_VHT_MSK) {
2697 mvm->drv_rx_stats.vht_frames++;
2698 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2699 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2700 RATE_VHT_MCS_NSS_POS) + 1;
2702 mvm->drv_rx_stats.legacy_frames++;
2706 mvm->drv_rx_stats.siso_frames++;
2708 mvm->drv_rx_stats.mimo2_frames++;
2710 if (rate & RATE_MCS_SGI_MSK)
2711 mvm->drv_rx_stats.sgi_frames++;
2713 mvm->drv_rx_stats.ngi_frames++;
2715 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2716 mvm->drv_rx_stats.last_frame_idx =
2717 (mvm->drv_rx_stats.last_frame_idx + 1) %
2718 ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2720 spin_unlock(&mvm->drv_stats_lock);
2725 * Called after adding a new station to initialize rate scaling
2727 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2728 enum ieee80211_band band, bool init)
2731 struct ieee80211_hw *hw = mvm->hw;
2732 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2733 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2734 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2735 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2736 struct ieee80211_supported_band *sband;
2737 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2739 /* clear all non-persistent lq data */
2740 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2742 sband = hw->wiphy->bands[band];
2744 lq_sta->lq.sta_id = sta_priv->sta_id;
2746 for (j = 0; j < LQ_SIZE; j++)
2747 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2749 lq_sta->flush_timer = 0;
2750 lq_sta->last_tx = jiffies;
2753 "LQ: *** rate scale station global init for station %d ***\n",
2755 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2756 * the lowest or the highest rate.. Could consider using RSSI from
2757 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2760 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2761 lq_sta->band = sband->band;
2763 * active legacy rates as per supported rates bitmap
2765 supp = sta->supp_rates[sband->band];
2766 lq_sta->active_legacy_rate = 0;
2767 for_each_set_bit(i, &supp, BITS_PER_LONG)
2768 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2770 /* TODO: should probably account for rx_highest for both HT/VHT */
2771 if (!vht_cap || !vht_cap->vht_supported)
2772 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2774 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2776 if (IWL_MVM_RS_DISABLE_P2P_MIMO && sta_priv->vif->p2p)
2777 lq_sta->active_mimo2_rate = 0;
2779 lq_sta->max_legacy_rate_idx =
2780 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2781 lq_sta->max_siso_rate_idx =
2782 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2783 lq_sta->max_mimo2_rate_idx =
2784 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2787 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2788 lq_sta->active_legacy_rate,
2789 lq_sta->active_siso_rate,
2790 lq_sta->active_mimo2_rate,
2791 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2792 lq_sta->bfer_capable);
2793 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2794 lq_sta->max_legacy_rate_idx,
2795 lq_sta->max_siso_rate_idx,
2796 lq_sta->max_mimo2_rate_idx);
2798 /* These values will be overridden later */
2799 lq_sta->lq.single_stream_ant_msk =
2800 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2801 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2803 /* as default allow aggregation for all tids */
2804 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2806 #ifdef CONFIG_IWLWIFI_DEBUGFS
2807 iwl_mvm_reset_frame_stats(mvm);
2809 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2812 static void rs_rate_update(void *mvm_r,
2813 struct ieee80211_supported_band *sband,
2814 struct cfg80211_chan_def *chandef,
2815 struct ieee80211_sta *sta, void *priv_sta,
2819 struct iwl_op_mode *op_mode =
2820 (struct iwl_op_mode *)mvm_r;
2821 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2823 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2824 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2825 ieee80211_stop_tx_ba_session(sta, tid);
2827 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2830 #ifdef CONFIG_MAC80211_DEBUGFS
2831 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2832 struct iwl_lq_cmd *lq_cmd,
2833 enum ieee80211_band band,
2836 struct rs_rate rate;
2838 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2839 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2840 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2842 for (i = 0; i < num_rates; i++)
2843 lq_cmd->rs_table[i] = ucode_rate_le32;
2845 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2848 lq_cmd->mimo_delim = num_rates - 1;
2850 lq_cmd->mimo_delim = 0;
2852 lq_cmd->reduced_tpc = 0;
2854 if (num_of_ant(ant) == 1)
2855 lq_cmd->single_stream_ant_msk = ant;
2857 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2859 #endif /* CONFIG_MAC80211_DEBUGFS */
2861 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2862 struct iwl_lq_sta *lq_sta,
2863 struct rs_rate *rate,
2864 __le32 *rs_table, int *rs_table_index,
2865 int num_rates, int num_retries,
2866 u8 valid_tx_ant, bool toggle_ant)
2870 bool bottom_reached = false;
2871 int prev_rate_idx = rate->index;
2872 int end = LINK_QUAL_MAX_RETRY_NUM;
2873 int index = *rs_table_index;
2875 for (i = 0; i < num_rates && index < end; i++) {
2876 for (j = 0; j < num_retries && index < end; j++, index++) {
2877 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
2879 rs_table[index] = ucode_rate;
2881 rs_toggle_antenna(valid_tx_ant, rate);
2884 prev_rate_idx = rate->index;
2885 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2886 if (bottom_reached && !is_legacy(rate))
2890 if (!bottom_reached && !is_legacy(rate))
2891 rate->index = prev_rate_idx;
2893 *rs_table_index = index;
2896 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2897 * column the rate table should look like this:
2899 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2900 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2901 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2902 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2903 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2904 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2905 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2906 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2907 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2908 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2909 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2910 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2911 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2912 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2913 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2914 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2916 static void rs_build_rates_table(struct iwl_mvm *mvm,
2917 struct ieee80211_sta *sta,
2918 struct iwl_lq_sta *lq_sta,
2919 const struct rs_rate *initial_rate)
2921 struct rs_rate rate;
2922 int num_rates, num_retries, index = 0;
2923 u8 valid_tx_ant = 0;
2924 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2925 bool toggle_ant = false;
2927 memcpy(&rate, initial_rate, sizeof(rate));
2929 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2931 /* TODO: remove old API when min FW API hits 14 */
2932 if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
2933 rs_stbc_allow(mvm, sta, lq_sta))
2936 if (is_siso(&rate)) {
2937 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2938 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2939 } else if (is_mimo(&rate)) {
2940 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2941 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2943 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
2944 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
2948 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2949 num_rates, num_retries, valid_tx_ant,
2952 rs_get_lower_rate_down_column(lq_sta, &rate);
2954 if (is_siso(&rate)) {
2955 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2956 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
2957 lq_cmd->mimo_delim = index;
2958 } else if (is_legacy(&rate)) {
2959 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2960 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2967 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2968 num_rates, num_retries, valid_tx_ant,
2971 rs_get_lower_rate_down_column(lq_sta, &rate);
2973 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2974 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
2976 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2977 num_rates, num_retries, valid_tx_ant,
2982 struct rs_bfer_active_iter_data {
2983 struct ieee80211_sta *exclude_sta;
2984 struct iwl_mvm_sta *bfer_mvmsta;
2987 static void rs_bfer_active_iter(void *_data,
2988 struct ieee80211_sta *sta)
2990 struct rs_bfer_active_iter_data *data = _data;
2991 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2992 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq;
2993 u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
2995 if (sta == data->exclude_sta)
2998 /* The current sta has BFER allowed */
2999 if (ss_params & LQ_SS_BFER_ALLOWED) {
3000 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3002 data->bfer_mvmsta = mvmsta;
3006 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3009 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3012 case NL80211_IFTYPE_AP:
3013 case NL80211_IFTYPE_P2P_GO:
3016 case NL80211_IFTYPE_P2P_CLIENT:
3019 case NL80211_IFTYPE_STATION:
3023 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3030 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3031 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3032 struct iwl_mvm_sta *sta2)
3034 int prio1 = rs_bfer_priority(sta1);
3035 int prio2 = rs_bfer_priority(sta2);
3044 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3045 struct ieee80211_sta *sta,
3046 struct iwl_lq_sta *lq_sta,
3047 const struct rs_rate *initial_rate)
3049 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3050 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3051 struct rs_bfer_active_iter_data data = {
3053 .bfer_mvmsta = NULL,
3055 struct iwl_mvm_sta *bfer_mvmsta = NULL;
3056 u32 ss_params = LQ_SS_PARAMS_VALID;
3058 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3061 /* Check if forcing the decision is configured.
3062 * Note that SISO is forced by not allowing STBC or BFER
3064 if (lq_sta->ss_force == RS_SS_FORCE_STBC)
3065 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3066 else if (lq_sta->ss_force == RS_SS_FORCE_BFER)
3067 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3069 if (lq_sta->ss_force != RS_SS_FORCE_NONE) {
3070 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3075 if (lq_sta->stbc_capable)
3076 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3078 if (!lq_sta->bfer_capable)
3081 ieee80211_iterate_stations_atomic(mvm->hw,
3082 rs_bfer_active_iter,
3084 bfer_mvmsta = data.bfer_mvmsta;
3086 /* This code is safe as it doesn't run concurrently for different
3087 * stations. This is guaranteed by the fact that calls to
3088 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3091 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3093 ss_params |= LQ_SS_BFER_ALLOWED;
3097 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3098 bfer_mvmsta->sta_id);
3100 /* Disallow BFER on another STA if active and we're a higher priority */
3101 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3102 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq;
3103 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3105 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3106 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3107 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3109 ss_params |= LQ_SS_BFER_ALLOWED;
3111 "Lower priority BFER sta found (%d). Switch BFER\n",
3112 bfer_mvmsta->sta_id);
3115 lq_cmd->ss_params = cpu_to_le32(ss_params);
3118 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3119 struct ieee80211_sta *sta,
3120 struct iwl_lq_sta *lq_sta,
3121 const struct rs_rate *initial_rate)
3123 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3124 struct iwl_mvm_sta *mvmsta;
3125 struct iwl_mvm_vif *mvmvif;
3127 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3128 lq_cmd->agg_time_limit =
3129 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3131 #ifdef CONFIG_MAC80211_DEBUGFS
3132 if (lq_sta->pers.dbg_fixed_rate) {
3133 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3135 lq_sta->pers.dbg_fixed_rate);
3139 if (WARN_ON_ONCE(!sta || !initial_rate))
3142 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3144 if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS)
3145 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3147 if (num_of_ant(initial_rate->ant) == 1)
3148 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3150 mvmsta = iwl_mvm_sta_from_mac80211(sta);
3151 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3153 if (num_of_ant(initial_rate->ant) == 1)
3154 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3156 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3159 * In case of low latency, tell the firwmare to leave a frame in the
3160 * Tx Fifo so that it can start a transaction in the same TxOP. This
3161 * basically allows the firmware to send bursts.
3163 if (iwl_mvm_vif_low_latency(mvmvif)) {
3164 lq_cmd->agg_frame_cnt_limit--;
3166 if (mvm->low_latency_agg_frame_limit)
3167 lq_cmd->agg_frame_cnt_limit =
3168 min(lq_cmd->agg_frame_cnt_limit,
3169 mvm->low_latency_agg_frame_limit);
3172 if (mvmsta->vif->p2p)
3173 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3175 lq_cmd->agg_time_limit =
3176 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3179 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3183 /* rate scale requires free function to be implemented */
3184 static void rs_free(void *mvm_rate)
3189 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3192 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3193 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3195 IWL_DEBUG_RATE(mvm, "enter\n");
3196 IWL_DEBUG_RATE(mvm, "leave\n");
3199 #ifdef CONFIG_MAC80211_DEBUGFS
3200 int rs_pretty_print_rate(char *buf, const u32 rate)
3204 u8 mcs = 0, nss = 0;
3205 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3207 if (!(rate & RATE_MCS_HT_MSK) &&
3208 !(rate & RATE_MCS_VHT_MSK)) {
3209 int index = iwl_hwrate_to_plcp_idx(rate);
3211 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3213 index == IWL_RATE_INVALID ? "BAD" :
3214 iwl_rate_mcs[index].mbps);
3217 if (rate & RATE_MCS_VHT_MSK) {
3219 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3220 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3221 >> RATE_VHT_MCS_NSS_POS) + 1;
3222 } else if (rate & RATE_MCS_HT_MSK) {
3224 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3226 type = "Unknown"; /* shouldn't happen */
3229 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3230 case RATE_MCS_CHAN_WIDTH_20:
3233 case RATE_MCS_CHAN_WIDTH_40:
3236 case RATE_MCS_CHAN_WIDTH_80:
3239 case RATE_MCS_CHAN_WIDTH_160:
3246 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3247 type, rs_pretty_ant(ant), bw, mcs, nss,
3248 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3249 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3250 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3251 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3252 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3256 * Program the device to use fixed rate for frame transmit
3257 * This is for debugging/testing only
3258 * once the device start use fixed rate, we need to reload the module
3259 * to being back the normal operation.
3261 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3262 struct iwl_lq_sta *lq_sta)
3264 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3265 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3266 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3268 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3269 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3271 if (lq_sta->pers.dbg_fixed_rate) {
3272 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3273 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3277 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3278 const char __user *user_buf, size_t count, loff_t *ppos)
3280 struct iwl_lq_sta *lq_sta = file->private_data;
3281 struct iwl_mvm *mvm;
3286 mvm = lq_sta->pers.drv;
3287 memset(buf, 0, sizeof(buf));
3288 buf_size = min(count, sizeof(buf) - 1);
3289 if (copy_from_user(buf, user_buf, buf_size))
3292 if (sscanf(buf, "%x", &parsed_rate) == 1)
3293 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3295 lq_sta->pers.dbg_fixed_rate = 0;
3297 rs_program_fix_rate(mvm, lq_sta);
3302 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3303 char __user *user_buf, size_t count, loff_t *ppos)
3310 struct iwl_lq_sta *lq_sta = file->private_data;
3311 struct iwl_mvm *mvm;
3312 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3313 struct rs_rate *rate = &tbl->rate;
3314 mvm = lq_sta->pers.drv;
3315 buff = kmalloc(2048, GFP_KERNEL);
3319 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3320 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3321 lq_sta->total_failed, lq_sta->total_success,
3322 lq_sta->active_legacy_rate);
3323 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3324 lq_sta->pers.dbg_fixed_rate);
3325 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3326 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3327 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3328 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3329 desc += sprintf(buff+desc, "lq type %s\n",
3330 (is_legacy(rate)) ? "legacy" :
3331 is_vht(rate) ? "VHT" : "HT");
3332 if (!is_legacy(rate)) {
3333 desc += sprintf(buff+desc, " %s",
3334 (is_siso(rate)) ? "SISO" : "MIMO2");
3335 desc += sprintf(buff+desc, " %s",
3336 (is_ht20(rate)) ? "20MHz" :
3337 (is_ht40(rate)) ? "40MHz" :
3338 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3339 desc += sprintf(buff+desc, " %s %s %s\n",
3340 (rate->sgi) ? "SGI" : "NGI",
3341 (rate->ldpc) ? "LDPC" : "BCC",
3342 (lq_sta->is_agg) ? "AGG on" : "");
3344 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3345 lq_sta->last_rate_n_flags);
3346 desc += sprintf(buff+desc,
3347 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3349 lq_sta->lq.mimo_delim,
3350 lq_sta->lq.single_stream_ant_msk,
3351 lq_sta->lq.dual_stream_ant_msk);
3353 desc += sprintf(buff+desc,
3354 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3355 le16_to_cpu(lq_sta->lq.agg_time_limit),
3356 lq_sta->lq.agg_disable_start_th,
3357 lq_sta->lq.agg_frame_cnt_limit);
3359 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3360 desc += sprintf(buff+desc,
3361 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3362 lq_sta->lq.initial_rate_index[0],
3363 lq_sta->lq.initial_rate_index[1],
3364 lq_sta->lq.initial_rate_index[2],
3365 lq_sta->lq.initial_rate_index[3]);
3367 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3368 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3370 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3371 desc += rs_pretty_print_rate(buff+desc, r);
3374 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3379 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3380 .write = rs_sta_dbgfs_scale_table_write,
3381 .read = rs_sta_dbgfs_scale_table_read,
3382 .open = simple_open,
3383 .llseek = default_llseek,
3385 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3386 char __user *user_buf, size_t count, loff_t *ppos)
3392 struct iwl_scale_tbl_info *tbl;
3393 struct rs_rate *rate;
3394 struct iwl_lq_sta *lq_sta = file->private_data;
3396 buff = kmalloc(1024, GFP_KERNEL);
3400 for (i = 0; i < LQ_SIZE; i++) {
3401 tbl = &(lq_sta->lq_info[i]);
3403 desc += sprintf(buff+desc,
3404 "%s type=%d SGI=%d BW=%s DUP=0\n"
3406 lq_sta->active_tbl == i ? "*" : "x",
3409 is_ht20(rate) ? "20Mhz" :
3410 is_ht40(rate) ? "40Mhz" :
3411 is_ht80(rate) ? "80Mhz" : "ERR",
3413 for (j = 0; j < IWL_RATE_COUNT; j++) {
3414 desc += sprintf(buff+desc,
3415 "counter=%d success=%d %%=%d\n",
3416 tbl->win[j].counter,
3417 tbl->win[j].success_counter,
3418 tbl->win[j].success_ratio);
3421 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3426 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3427 .read = rs_sta_dbgfs_stats_table_read,
3428 .open = simple_open,
3429 .llseek = default_llseek,
3432 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3433 char __user *user_buf,
3434 size_t count, loff_t *ppos)
3436 static const char * const column_name[] = {
3437 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3438 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3439 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3440 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3441 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3442 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3443 [RS_COLUMN_MIMO2] = "MIMO2",
3444 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3447 static const char * const rate_name[] = {
3448 [IWL_RATE_1M_INDEX] = "1M",
3449 [IWL_RATE_2M_INDEX] = "2M",
3450 [IWL_RATE_5M_INDEX] = "5.5M",
3451 [IWL_RATE_11M_INDEX] = "11M",
3452 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3453 [IWL_RATE_9M_INDEX] = "9M",
3454 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3455 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3456 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3457 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3458 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3459 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3460 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3461 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3462 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3465 char *buff, *pos, *endpos;
3468 struct iwl_lq_sta *lq_sta = file->private_data;
3469 struct rs_rate_stats *stats;
3470 static const size_t bufsz = 1024;
3472 buff = kmalloc(bufsz, GFP_KERNEL);
3477 endpos = pos + bufsz;
3479 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3480 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3481 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3482 pos += scnprintf(pos, endpos - pos, "\n");
3484 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3485 pos += scnprintf(pos, endpos - pos,
3486 "%s,", column_name[col]);
3488 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3489 stats = &(lq_sta->pers.tx_stats[col][rate]);
3490 pos += scnprintf(pos, endpos - pos,
3495 pos += scnprintf(pos, endpos - pos, "\n");
3498 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3503 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3504 const char __user *user_buf,
3505 size_t count, loff_t *ppos)
3507 struct iwl_lq_sta *lq_sta = file->private_data;
3508 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3513 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3514 .read = rs_sta_dbgfs_drv_tx_stats_read,
3515 .write = rs_sta_dbgfs_drv_tx_stats_write,
3516 .open = simple_open,
3517 .llseek = default_llseek,
3520 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3521 char __user *user_buf,
3522 size_t count, loff_t *ppos)
3524 struct iwl_lq_sta *lq_sta = file->private_data;
3526 int bufsz = sizeof(buf);
3528 static const char * const ss_force_name[] = {
3529 [RS_SS_FORCE_NONE] = "none",
3530 [RS_SS_FORCE_STBC] = "stbc",
3531 [RS_SS_FORCE_BFER] = "bfer",
3532 [RS_SS_FORCE_SISO] = "siso",
3535 pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
3536 ss_force_name[lq_sta->ss_force]);
3537 return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
3540 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
3541 size_t count, loff_t *ppos)
3543 struct iwl_mvm *mvm = lq_sta->pers.drv;
3546 if (!strncmp("none", buf, 4)) {
3547 lq_sta->ss_force = RS_SS_FORCE_NONE;
3548 } else if (!strncmp("siso", buf, 4)) {
3549 lq_sta->ss_force = RS_SS_FORCE_SISO;
3550 } else if (!strncmp("stbc", buf, 4)) {
3551 if (lq_sta->stbc_capable) {
3552 lq_sta->ss_force = RS_SS_FORCE_STBC;
3555 "can't force STBC. peer doesn't support\n");
3558 } else if (!strncmp("bfer", buf, 4)) {
3559 if (lq_sta->bfer_capable) {
3560 lq_sta->ss_force = RS_SS_FORCE_BFER;
3563 "can't force BFER. peer doesn't support\n");
3567 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
3570 return ret ?: count;
3573 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3574 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3575 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3576 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3577 &iwl_dbgfs_##name##_ops)) \
3581 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
3583 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3585 struct iwl_lq_sta *lq_sta = mvm_sta;
3587 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3588 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3589 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3590 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3591 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3592 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3593 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3594 &lq_sta->tx_agg_tid_en);
3595 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3596 &lq_sta->pers.dbg_fixed_txp_reduction);
3598 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
3601 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
3604 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3610 * Initialization of rate scaling information is done by driver after
3611 * the station is added. Since mac80211 calls this function before a
3612 * station is added we ignore it.
3614 static void rs_rate_init_stub(void *mvm_r,
3615 struct ieee80211_supported_band *sband,
3616 struct cfg80211_chan_def *chandef,
3617 struct ieee80211_sta *sta, void *mvm_sta)
3621 static const struct rate_control_ops rs_mvm_ops = {
3623 .tx_status = rs_mac80211_tx_status,
3624 .get_rate = rs_get_rate,
3625 .rate_init = rs_rate_init_stub,
3628 .alloc_sta = rs_alloc_sta,
3629 .free_sta = rs_free_sta,
3630 .rate_update = rs_rate_update,
3631 #ifdef CONFIG_MAC80211_DEBUGFS
3632 .add_sta_debugfs = rs_add_debugfs,
3633 .remove_sta_debugfs = rs_remove_debugfs,
3637 int iwl_mvm_rate_control_register(void)
3639 return ieee80211_rate_control_register(&rs_mvm_ops);
3642 void iwl_mvm_rate_control_unregister(void)
3644 ieee80211_rate_control_unregister(&rs_mvm_ops);
3648 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3649 * Tx protection, according to this rquest and previous requests,
3650 * and send the LQ command.
3651 * @mvmsta: The station
3652 * @enable: Enable Tx protection?
3654 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3657 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3659 lockdep_assert_held(&mvm->mutex);
3662 if (mvmsta->tx_protection == 0)
3663 lq->flags |= LQ_FLAG_USE_RTS_MSK;
3664 mvmsta->tx_protection++;
3666 mvmsta->tx_protection--;
3667 if (mvmsta->tx_protection == 0)
3668 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3671 return iwl_mvm_send_lq_cmd(mvm, lq, false);