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"
43 #define RS_NAME "iwl-mvm-rs"
45 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
47 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
48 * Use this macro when dealing with thresholds consts set as a percentage
50 #define RS_PERCENT(x) (128 * x)
52 static u8 rs_ht_to_legacy[] = {
53 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
54 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
55 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
56 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
57 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
58 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
59 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
60 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
61 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
62 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
65 static const u8 ant_toggle_lookup[] = {
66 [ANT_NONE] = ANT_NONE,
76 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
77 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
78 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
79 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
80 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
82 IWL_RATE_##rp##M_INDEX, \
83 IWL_RATE_##rn##M_INDEX }
85 #define IWL_DECLARE_MCS_RATE(s) \
86 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
87 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
88 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
89 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
91 IWL_RATE_INVM_INDEX, \
96 * rate, ht rate, prev rate, next rate
98 * If there isn't a valid next or previous rate then INV is used which
99 * maps to IWL_RATE_INVALID
102 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
103 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
104 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
105 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
106 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
107 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
108 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
109 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
110 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
111 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
112 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
113 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
114 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
115 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
116 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
117 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
122 RS_ACTION_DOWNSCALE = -1,
123 RS_ACTION_UPSCALE = 1,
126 enum rs_column_mode {
133 #define MAX_NEXT_COLUMNS 7
134 #define MAX_COLUMN_CHECKS 3
136 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
137 struct ieee80211_sta *sta,
138 struct iwl_scale_tbl_info *tbl);
140 struct rs_tx_column {
141 enum rs_column_mode mode;
144 enum rs_column next_columns[MAX_NEXT_COLUMNS];
145 allow_column_func_t checks[MAX_COLUMN_CHECKS];
148 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
149 struct iwl_scale_tbl_info *tbl)
151 return iwl_mvm_bt_coex_is_ant_avail(mvm, tbl->rate.ant);
154 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
155 struct iwl_scale_tbl_info *tbl)
157 if (!sta->ht_cap.ht_supported)
160 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
163 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
166 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
172 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
173 struct iwl_scale_tbl_info *tbl)
175 if (!sta->ht_cap.ht_supported)
181 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
182 struct iwl_scale_tbl_info *tbl)
184 struct rs_rate *rate = &tbl->rate;
185 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
186 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
188 if (is_ht20(rate) && (ht_cap->cap &
189 IEEE80211_HT_CAP_SGI_20))
191 if (is_ht40(rate) && (ht_cap->cap &
192 IEEE80211_HT_CAP_SGI_40))
194 if (is_ht80(rate) && (vht_cap->cap &
195 IEEE80211_VHT_CAP_SHORT_GI_80))
201 static const struct rs_tx_column rs_tx_columns[] = {
202 [RS_COLUMN_LEGACY_ANT_A] = {
206 RS_COLUMN_LEGACY_ANT_B,
207 RS_COLUMN_SISO_ANT_A,
218 [RS_COLUMN_LEGACY_ANT_B] = {
222 RS_COLUMN_LEGACY_ANT_A,
223 RS_COLUMN_SISO_ANT_B,
234 [RS_COLUMN_SISO_ANT_A] = {
238 RS_COLUMN_SISO_ANT_B,
240 RS_COLUMN_SISO_ANT_A_SGI,
241 RS_COLUMN_LEGACY_ANT_A,
242 RS_COLUMN_LEGACY_ANT_B,
251 [RS_COLUMN_SISO_ANT_B] = {
255 RS_COLUMN_SISO_ANT_A,
257 RS_COLUMN_SISO_ANT_B_SGI,
258 RS_COLUMN_LEGACY_ANT_A,
259 RS_COLUMN_LEGACY_ANT_B,
268 [RS_COLUMN_SISO_ANT_A_SGI] = {
273 RS_COLUMN_SISO_ANT_B_SGI,
275 RS_COLUMN_SISO_ANT_A,
276 RS_COLUMN_LEGACY_ANT_A,
277 RS_COLUMN_LEGACY_ANT_B,
287 [RS_COLUMN_SISO_ANT_B_SGI] = {
292 RS_COLUMN_SISO_ANT_A_SGI,
294 RS_COLUMN_SISO_ANT_B,
295 RS_COLUMN_LEGACY_ANT_A,
296 RS_COLUMN_LEGACY_ANT_B,
306 [RS_COLUMN_MIMO2] = {
310 RS_COLUMN_SISO_ANT_A,
312 RS_COLUMN_LEGACY_ANT_A,
313 RS_COLUMN_LEGACY_ANT_B,
322 [RS_COLUMN_MIMO2_SGI] = {
327 RS_COLUMN_SISO_ANT_A_SGI,
329 RS_COLUMN_LEGACY_ANT_A,
330 RS_COLUMN_LEGACY_ANT_B,
342 static inline u8 rs_extract_rate(u32 rate_n_flags)
344 /* also works for HT because bits 7:6 are zero there */
345 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
348 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
352 if (rate_n_flags & RATE_MCS_HT_MSK) {
353 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
354 idx += IWL_RATE_MCS_0_INDEX;
356 /* skip 9M not supported in HT*/
357 if (idx >= IWL_RATE_9M_INDEX)
359 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
361 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
362 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
363 idx += IWL_RATE_MCS_0_INDEX;
365 /* skip 9M not supported in VHT*/
366 if (idx >= IWL_RATE_9M_INDEX)
368 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
371 /* legacy rate format, search for match in table */
373 u8 legacy_rate = rs_extract_rate(rate_n_flags);
374 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
375 if (iwl_rates[idx].plcp == legacy_rate)
379 return IWL_RATE_INVALID;
382 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
383 struct ieee80211_sta *sta,
384 struct iwl_lq_sta *lq_sta,
386 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
387 struct ieee80211_sta *sta,
388 struct iwl_lq_sta *lq_sta,
389 const struct rs_rate *initial_rate);
390 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
393 * The following tables contain the expected throughput metrics for all rates
395 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
397 * where invalid entries are zeros.
399 * CCK rates are only valid in legacy table and will only be used in G
403 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
404 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
407 /* Expected TpT tables. 4 indexes:
408 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
410 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
411 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
412 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
413 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
414 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
417 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
418 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
419 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
420 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
421 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
424 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
425 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
426 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
427 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
428 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
431 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
432 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
433 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
434 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
435 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
438 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
439 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
440 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
441 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
442 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
445 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
446 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
447 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
448 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
449 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
453 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
462 { "24", "16QAM 1/2"},
463 { "36", "16QAM 3/4"},
464 { "48", "64QAM 2/3"},
465 { "54", "64QAM 3/4"},
466 { "60", "64QAM 5/6"},
469 #define MCS_INDEX_PER_STREAM (8)
471 static const char *rs_pretty_ant(u8 ant)
473 static const char * const ant_name[] = {
487 return ant_name[ant];
490 static const char *rs_pretty_lq_type(enum iwl_table_type type)
492 static const char * const lq_types[] = {
494 [LQ_LEGACY_A] = "LEGACY_A",
495 [LQ_LEGACY_G] = "LEGACY_G",
496 [LQ_HT_SISO] = "HT SISO",
497 [LQ_HT_MIMO2] = "HT MIMO",
498 [LQ_VHT_SISO] = "VHT SISO",
499 [LQ_VHT_MIMO2] = "VHT MIMO",
502 if (type < LQ_NONE || type >= LQ_MAX)
505 return lq_types[type];
508 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
512 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
513 prefix, rs_pretty_lq_type(rate->type),
514 rate->index, rs_pretty_ant(rate->ant),
515 rate->bw, rate->sgi, rate->ldpc, rate->stbc);
518 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
521 window->success_counter = 0;
522 window->success_ratio = IWL_INVALID_VALUE;
524 window->average_tpt = IWL_INVALID_VALUE;
527 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
528 struct iwl_scale_tbl_info *tbl)
532 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
533 for (i = 0; i < IWL_RATE_COUNT; i++)
534 rs_rate_scale_clear_window(&tbl->win[i]);
536 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
537 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
540 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
542 return (ant_type & valid_antenna) == ant_type;
545 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
546 struct iwl_lq_sta *lq_data, u8 tid,
547 struct ieee80211_sta *sta)
551 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
553 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
554 if (ret == -EAGAIN) {
556 * driver and mac80211 is out of sync
557 * this might be cause by reloading firmware
558 * stop the tx ba session here
560 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
562 ieee80211_stop_tx_ba_session(sta, tid);
567 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
568 struct iwl_lq_sta *lq_data,
569 struct ieee80211_sta *sta)
571 if (tid < IWL_MAX_TID_COUNT)
572 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
574 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
575 tid, IWL_MAX_TID_COUNT);
578 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
580 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
581 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
582 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
586 * Static function to get the expected throughput from an iwl_scale_tbl_info
587 * that wraps a NULL pointer check
589 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
591 if (tbl->expected_tpt)
592 return tbl->expected_tpt[rs_index];
597 * rs_collect_tx_data - Update the success/failure sliding window
599 * We keep a sliding window of the last 62 packets transmitted
600 * at this rate. window->data contains the bitmask of successful
603 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
604 struct iwl_scale_tbl_info *tbl,
605 int scale_index, int attempts, int successes,
606 struct iwl_rate_scale_data *window)
608 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
611 /* Get expected throughput */
612 tpt = get_expected_tpt(tbl, scale_index);
615 * Keep track of only the latest 62 tx frame attempts in this rate's
616 * history window; anything older isn't really relevant any more.
617 * If we have filled up the sliding window, drop the oldest attempt;
618 * if the oldest attempt (highest bit in bitmap) shows "success",
619 * subtract "1" from the success counter (this is the main reason
620 * we keep these bitmaps!).
622 while (attempts > 0) {
623 if (window->counter >= IWL_RATE_MAX_WINDOW) {
624 /* remove earliest */
625 window->counter = IWL_RATE_MAX_WINDOW - 1;
627 if (window->data & mask) {
628 window->data &= ~mask;
629 window->success_counter--;
633 /* Increment frames-attempted counter */
636 /* Shift bitmap by one frame to throw away oldest history */
639 /* Mark the most recent #successes attempts as successful */
641 window->success_counter++;
649 /* Calculate current success ratio, avoid divide-by-0! */
650 if (window->counter > 0)
651 window->success_ratio = 128 * (100 * window->success_counter)
654 window->success_ratio = IWL_INVALID_VALUE;
656 fail_count = window->counter - window->success_counter;
658 /* Calculate average throughput, if we have enough history. */
659 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
660 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
661 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
663 window->average_tpt = IWL_INVALID_VALUE;
668 static int rs_collect_tx_data(struct iwl_mvm *mvm,
669 struct iwl_lq_sta *lq_sta,
670 struct iwl_scale_tbl_info *tbl,
671 int scale_index, int attempts, int successes,
674 struct iwl_rate_scale_data *window = NULL;
677 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
680 if (tbl->column != RS_COLUMN_INVALID) {
681 struct lq_sta_pers *pers = &lq_sta->pers;
683 pers->tx_stats[tbl->column][scale_index].total += attempts;
684 pers->tx_stats[tbl->column][scale_index].success += successes;
687 /* Select window for current tx bit rate */
688 window = &(tbl->win[scale_index]);
690 ret = _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
695 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
698 window = &tbl->tpc_win[reduced_txp];
699 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
703 /* Convert rs_rate object into ucode rate bitmask */
704 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
705 struct rs_rate *rate)
708 int index = rate->index;
710 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
711 RATE_MCS_ANT_ABC_MSK);
713 if (is_legacy(rate)) {
714 ucode_rate |= iwl_rates[index].plcp;
715 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
716 ucode_rate |= RATE_MCS_CCK_MSK;
721 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
722 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
723 index = IWL_LAST_HT_RATE;
725 ucode_rate |= RATE_MCS_HT_MSK;
727 if (is_ht_siso(rate))
728 ucode_rate |= iwl_rates[index].plcp_ht_siso;
729 else if (is_ht_mimo2(rate))
730 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
733 } else if (is_vht(rate)) {
734 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
735 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
736 index = IWL_LAST_VHT_RATE;
738 ucode_rate |= RATE_MCS_VHT_MSK;
739 if (is_vht_siso(rate))
740 ucode_rate |= iwl_rates[index].plcp_vht_siso;
741 else if (is_vht_mimo2(rate))
742 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
747 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
750 if (is_siso(rate) && rate->stbc) {
751 /* To enable STBC we need to set both a flag and ANT_AB */
752 ucode_rate |= RATE_MCS_ANT_AB_MSK;
753 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
756 ucode_rate |= rate->bw;
758 ucode_rate |= RATE_MCS_SGI_MSK;
760 ucode_rate |= RATE_MCS_LDPC_MSK;
765 /* Convert a ucode rate into an rs_rate object */
766 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
767 enum ieee80211_band band,
768 struct rs_rate *rate)
770 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
771 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
774 memset(rate, 0, sizeof(*rate));
775 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
777 if (rate->index == IWL_RATE_INVALID)
780 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
783 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
784 !(ucode_rate & RATE_MCS_VHT_MSK)) {
785 if (num_of_ant == 1) {
786 if (band == IEEE80211_BAND_5GHZ)
787 rate->type = LQ_LEGACY_A;
789 rate->type = LQ_LEGACY_G;
796 if (ucode_rate & RATE_MCS_SGI_MSK)
798 if (ucode_rate & RATE_MCS_LDPC_MSK)
800 if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
803 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
805 if (ucode_rate & RATE_MCS_HT_MSK) {
806 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
807 RATE_HT_MCS_NSS_POS) + 1;
810 rate->type = LQ_HT_SISO;
811 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
812 } else if (nss == 2) {
813 rate->type = LQ_HT_MIMO2;
814 WARN_ON_ONCE(num_of_ant != 2);
818 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
819 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
820 RATE_VHT_MCS_NSS_POS) + 1;
823 rate->type = LQ_VHT_SISO;
824 WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
825 } else if (nss == 2) {
826 rate->type = LQ_VHT_MIMO2;
827 WARN_ON_ONCE(num_of_ant != 2);
833 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
834 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
840 /* switch to another antenna/antennas and return 1 */
841 /* if no other valid antenna found, return 0 */
842 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
846 if (!rate->ant || rate->ant > ANT_ABC)
849 if (!rs_is_valid_ant(valid_ant, rate->ant))
852 new_ant_type = ant_toggle_lookup[rate->ant];
854 while ((new_ant_type != rate->ant) &&
855 !rs_is_valid_ant(valid_ant, new_ant_type))
856 new_ant_type = ant_toggle_lookup[new_ant_type];
858 if (new_ant_type == rate->ant)
861 rate->ant = new_ant_type;
866 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
867 struct rs_rate *rate)
870 return lq_sta->active_legacy_rate;
871 else if (is_siso(rate))
872 return lq_sta->active_siso_rate;
873 else if (is_mimo2(rate))
874 return lq_sta->active_mimo2_rate;
880 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
883 u8 high = IWL_RATE_INVALID;
884 u8 low = IWL_RATE_INVALID;
886 /* 802.11A or ht walks to the next literal adjacent rate in
888 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
892 /* Find the previous rate that is in the rate mask */
894 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
895 if (rate_mask & mask) {
901 /* Find the next rate that is in the rate mask */
903 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
904 if (rate_mask & mask) {
910 return (high << 8) | low;
914 while (low != IWL_RATE_INVALID) {
915 low = iwl_rates[low].prev_rs;
916 if (low == IWL_RATE_INVALID)
918 if (rate_mask & (1 << low))
920 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", 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))
930 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
933 return (high << 8) | low;
936 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
937 struct rs_rate *rate)
939 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
942 /* Get the next supported lower rate in the current column.
943 * Return true if bottom rate in the current column was reached
945 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
946 struct rs_rate *rate)
951 struct iwl_mvm *mvm = lq_sta->pers.drv;
953 rate_mask = rs_get_supported_rates(lq_sta, rate);
954 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
956 low = high_low & 0xff;
958 /* Bottom rate of column reached */
959 if (low == IWL_RATE_INVALID)
966 /* Get the next rate to use following a column downgrade */
967 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
968 struct rs_rate *rate)
970 struct iwl_mvm *mvm = lq_sta->pers.drv;
972 if (is_legacy(rate)) {
973 /* No column to downgrade from Legacy */
975 } else if (is_siso(rate)) {
976 /* Downgrade to Legacy if we were in SISO */
977 if (lq_sta->band == IEEE80211_BAND_5GHZ)
978 rate->type = LQ_LEGACY_A;
980 rate->type = LQ_LEGACY_G;
982 rate->bw = RATE_MCS_CHAN_WIDTH_20;
984 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
985 rate->index > IWL_RATE_MCS_9_INDEX);
987 rate->index = rs_ht_to_legacy[rate->index];
990 /* Downgrade to SISO with same MCS if in MIMO */
991 rate->type = is_vht_mimo2(rate) ?
992 LQ_VHT_SISO : LQ_HT_SISO;
995 if (num_of_ant(rate->ant) > 1)
996 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
998 /* Relevant in both switching to SISO or Legacy */
1001 if (!rs_rate_supported(lq_sta, rate))
1002 rs_get_lower_rate_in_column(lq_sta, rate);
1005 /* Simple function to compare two rate scale table types */
1006 static inline bool rs_rate_match(struct rs_rate *a,
1012 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1014 ant_match = (a->ant == b->ant);
1016 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1020 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1022 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1023 return RATE_MCS_CHAN_WIDTH_40;
1024 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1025 return RATE_MCS_CHAN_WIDTH_80;
1026 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1027 return RATE_MCS_CHAN_WIDTH_160;
1029 return RATE_MCS_CHAN_WIDTH_20;
1032 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1034 u8 tid = IWL_MAX_TID_COUNT;
1036 if (ieee80211_is_data_qos(hdr->frame_control)) {
1037 u8 *qc = ieee80211_get_qos_ctl(hdr);
1041 if (unlikely(tid > IWL_MAX_TID_COUNT))
1042 tid = IWL_MAX_TID_COUNT;
1047 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1048 int tid, struct ieee80211_tx_info *info)
1053 struct iwl_lq_cmd *table;
1054 enum mac80211_rate_control_flags mac_flags;
1056 struct rs_rate rate;
1057 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1058 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1059 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1060 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1062 /* Treat uninitialized rate scaling data same as non-existing. */
1064 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1066 } else if (!lq_sta->pers.drv) {
1067 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1071 #ifdef CONFIG_MAC80211_DEBUGFS
1072 /* Disable last tx check if we are debugging with fixed rate */
1073 if (lq_sta->pers.dbg_fixed_rate) {
1074 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1078 /* This packet was aggregated but doesn't carry status info */
1079 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1080 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1084 * Ignore this Tx frame response if its initial rate doesn't match
1085 * that of latest Link Quality command. There may be stragglers
1086 * from a previous Link Quality command, but we're no longer interested
1087 * in those; they're either from the "active" mode while we're trying
1088 * to check "search" mode, or a prior "search" mode after we've moved
1089 * to a new "search" mode (which might become the new "active" mode).
1091 table = &lq_sta->lq;
1092 ucode_rate = le32_to_cpu(table->rs_table[0]);
1093 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1094 if (info->band == IEEE80211_BAND_5GHZ)
1095 rate.index -= IWL_FIRST_OFDM_RATE;
1096 mac_flags = info->status.rates[0].flags;
1097 mac_index = info->status.rates[0].idx;
1098 /* For HT packets, map MCS to PLCP */
1099 if (mac_flags & IEEE80211_TX_RC_MCS) {
1100 /* Remove # of streams */
1101 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1102 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1105 * mac80211 HT index is always zero-indexed; we need to move
1106 * HT OFDM rates after CCK rates in 2.4 GHz band
1108 if (info->band == IEEE80211_BAND_2GHZ)
1109 mac_index += IWL_FIRST_OFDM_RATE;
1110 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1111 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1112 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1116 if (time_after(jiffies,
1117 (unsigned long)(lq_sta->last_tx +
1118 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1121 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1122 for (t = 0; t < IWL_MAX_TID_COUNT; t++)
1123 ieee80211_stop_tx_ba_session(sta, t);
1125 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1128 lq_sta->last_tx = jiffies;
1130 /* Here we actually compare this rate to the latest LQ command */
1131 if ((mac_index < 0) ||
1132 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1133 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1134 (rate.ant != info->status.antenna) ||
1135 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1136 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1137 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1138 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1139 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1140 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1141 (rate.index != mac_index)) {
1143 "initial rate %d does not match %d (0x%x)\n",
1144 mac_index, rate.index, ucode_rate);
1146 * Since rates mis-match, the last LQ command may have failed.
1147 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1150 lq_sta->missed_rate_counter++;
1151 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1152 lq_sta->missed_rate_counter = 0;
1154 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1156 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1158 /* Regardless, ignore this status info for outdated rate */
1161 /* Rate did match, so reset the missed_rate_counter */
1162 lq_sta->missed_rate_counter = 0;
1164 if (!lq_sta->search_better_tbl) {
1165 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1166 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1168 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1169 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1172 if (WARN_ON_ONCE(!rs_rate_match(&rate, &curr_tbl->rate))) {
1174 "Neither active nor search matches tx rate\n");
1175 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1176 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1177 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1178 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1179 rs_dump_rate(mvm, &rate, "ACTUAL");
1182 * no matching table found, let's by-pass the data collection
1183 * and continue to perform rate scale to find the rate table
1185 rs_stay_in_table(lq_sta, true);
1190 * Updating the frame history depends on whether packets were
1193 * For aggregation, all packets were transmitted at the same rate, the
1194 * first index into rate scale table.
1196 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1197 /* ampdu_ack_len = 0 marks no BA was received. In this case
1198 * treat it as a single frame loss as we don't want the success
1199 * ratio to dip too quickly because a BA wasn't received
1201 if (info->status.ampdu_ack_len == 0)
1202 info->status.ampdu_len = 1;
1204 ucode_rate = le32_to_cpu(table->rs_table[0]);
1205 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1206 rs_collect_tx_data(mvm, lq_sta, curr_tbl, rate.index,
1207 info->status.ampdu_len,
1208 info->status.ampdu_ack_len,
1211 /* Update success/fail counts if not searching for new mode */
1212 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1213 lq_sta->total_success += info->status.ampdu_ack_len;
1214 lq_sta->total_failed += (info->status.ampdu_len -
1215 info->status.ampdu_ack_len);
1219 * For legacy, update frame history with for each Tx retry.
1221 retries = info->status.rates[0].count - 1;
1222 /* HW doesn't send more than 15 retries */
1223 retries = min(retries, 15);
1225 /* The last transmission may have been successful */
1226 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1227 /* Collect data for each rate used during failed TX attempts */
1228 for (i = 0; i <= retries; ++i) {
1229 ucode_rate = le32_to_cpu(table->rs_table[i]);
1230 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1232 * Only collect stats if retried rate is in the same RS
1233 * table as active/search.
1235 if (rs_rate_match(&rate, &curr_tbl->rate))
1237 else if (rs_rate_match(&rate, &other_tbl->rate))
1238 tmp_tbl = other_tbl;
1242 rs_collect_tx_data(mvm, lq_sta, tmp_tbl, rate.index, 1,
1243 i < retries ? 0 : legacy_success,
1247 /* Update success/fail counts if not searching for new mode */
1248 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1249 lq_sta->total_success += legacy_success;
1250 lq_sta->total_failed += retries + (1 - legacy_success);
1253 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1254 lq_sta->last_rate_n_flags = ucode_rate;
1255 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1257 /* See if there's a better rate or modulation mode to try. */
1258 if (sta->supp_rates[info->band])
1259 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1263 * mac80211 sends us Tx status
1265 static void rs_mac80211_tx_status(void *mvm_r,
1266 struct ieee80211_supported_band *sband,
1267 struct ieee80211_sta *sta, void *priv_sta,
1268 struct sk_buff *skb)
1270 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1271 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1272 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1273 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1275 if (!ieee80211_is_data(hdr->frame_control) ||
1276 info->flags & IEEE80211_TX_CTL_NO_ACK)
1279 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1283 * Begin a period of staying with a selected modulation mode.
1284 * Set "stay_in_tbl" flag to prevent any mode switches.
1285 * Set frame tx success limits according to legacy vs. high-throughput,
1286 * and reset overall (spanning all rates) tx success history statistics.
1287 * These control how long we stay using same modulation mode before
1288 * searching for a new mode.
1290 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1291 struct iwl_lq_sta *lq_sta)
1293 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1294 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1296 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1297 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1298 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1300 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1301 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1302 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1304 lq_sta->table_count = 0;
1305 lq_sta->total_failed = 0;
1306 lq_sta->total_success = 0;
1307 lq_sta->flush_timer = jiffies;
1308 lq_sta->visited_columns = 0;
1311 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1314 return find_last_bit(&rate_mask, BITS_PER_LONG);
1315 return IWL_RATE_INVALID;
1318 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1319 const struct rs_tx_column *column)
1321 switch (column->mode) {
1323 return lq_sta->max_legacy_rate_idx;
1325 return lq_sta->max_siso_rate_idx;
1327 return lq_sta->max_mimo2_rate_idx;
1332 return lq_sta->max_legacy_rate_idx;
1335 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1336 const struct rs_tx_column *column,
1339 /* Used to choose among HT tables */
1340 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1342 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1343 column->mode != RS_SISO &&
1344 column->mode != RS_MIMO2))
1345 return expected_tpt_legacy;
1347 /* Legacy rates have only one table */
1348 if (column->mode == RS_LEGACY)
1349 return expected_tpt_legacy;
1351 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1352 /* Choose among many HT tables depending on number of streams
1353 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1355 if (column->mode == RS_SISO) {
1357 case RATE_MCS_CHAN_WIDTH_20:
1358 ht_tbl_pointer = expected_tpt_siso_20MHz;
1360 case RATE_MCS_CHAN_WIDTH_40:
1361 ht_tbl_pointer = expected_tpt_siso_40MHz;
1363 case RATE_MCS_CHAN_WIDTH_80:
1364 ht_tbl_pointer = expected_tpt_siso_80MHz;
1369 } else if (column->mode == RS_MIMO2) {
1371 case RATE_MCS_CHAN_WIDTH_20:
1372 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1374 case RATE_MCS_CHAN_WIDTH_40:
1375 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1377 case RATE_MCS_CHAN_WIDTH_80:
1378 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1387 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1388 return ht_tbl_pointer[0];
1389 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1390 return ht_tbl_pointer[1];
1391 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1392 return ht_tbl_pointer[2];
1394 return ht_tbl_pointer[3];
1397 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1398 struct iwl_scale_tbl_info *tbl)
1400 struct rs_rate *rate = &tbl->rate;
1401 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1403 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1406 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1407 struct iwl_lq_sta *lq_sta,
1408 struct iwl_scale_tbl_info *tbl, /* "search" */
1409 unsigned long rate_mask, s8 index)
1411 struct iwl_scale_tbl_info *active_tbl =
1412 &(lq_sta->lq_info[lq_sta->active_tbl]);
1413 s32 success_ratio = active_tbl->win[index].success_ratio;
1414 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1415 const u16 *tpt_tbl = tbl->expected_tpt;
1420 if (success_ratio > IWL_MVM_RS_SR_NO_DECREASE) {
1421 target_tpt = 100 * expected_current_tpt;
1423 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1424 success_ratio, target_tpt);
1426 target_tpt = lq_sta->last_tpt;
1428 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1429 success_ratio, target_tpt);
1432 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1434 while (rate_idx != IWL_RATE_INVALID) {
1435 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1438 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1441 rate_idx = (high_low >> 8) & 0xff;
1444 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1445 rate_idx, target_tpt,
1446 rate_idx != IWL_RATE_INVALID ?
1447 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1452 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1454 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1455 return RATE_MCS_CHAN_WIDTH_80;
1456 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1457 return RATE_MCS_CHAN_WIDTH_40;
1459 return RATE_MCS_CHAN_WIDTH_20;
1463 * Check whether we should continue using same modulation mode, or
1464 * begin search for a new mode, based on:
1465 * 1) # tx successes or failures while using this mode
1466 * 2) # times calling this function
1467 * 3) elapsed time in this mode (not used, for now)
1469 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1471 struct iwl_scale_tbl_info *tbl;
1473 int flush_interval_passed = 0;
1474 struct iwl_mvm *mvm;
1476 mvm = lq_sta->pers.drv;
1477 active_tbl = lq_sta->active_tbl;
1479 tbl = &(lq_sta->lq_info[active_tbl]);
1481 /* If we've been disallowing search, see if we should now allow it */
1482 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1483 /* Elapsed time using current modulation mode */
1484 if (lq_sta->flush_timer)
1485 flush_interval_passed =
1487 (unsigned long)(lq_sta->flush_timer +
1488 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1491 * Check if we should allow search for new modulation mode.
1492 * If many frames have failed or succeeded, or we've used
1493 * this same modulation for a long time, allow search, and
1494 * reset history stats that keep track of whether we should
1495 * allow a new search. Also (below) reset all bitmaps and
1496 * stats in active history.
1499 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1500 (lq_sta->total_success > lq_sta->max_success_limit) ||
1501 ((!lq_sta->search_better_tbl) &&
1502 (lq_sta->flush_timer) && (flush_interval_passed))) {
1504 "LQ: stay is expired %d %d %d\n",
1505 lq_sta->total_failed,
1506 lq_sta->total_success,
1507 flush_interval_passed);
1509 /* Allow search for new mode */
1510 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1512 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1513 lq_sta->total_failed = 0;
1514 lq_sta->total_success = 0;
1515 lq_sta->flush_timer = 0;
1516 /* mark the current column as visited */
1517 lq_sta->visited_columns = BIT(tbl->column);
1519 * Else if we've used this modulation mode enough repetitions
1520 * (regardless of elapsed time or success/failure), reset
1521 * history bitmaps and rate-specific stats for all rates in
1525 lq_sta->table_count++;
1526 if (lq_sta->table_count >=
1527 lq_sta->table_count_limit) {
1528 lq_sta->table_count = 0;
1531 "LQ: stay in table clear win\n");
1532 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1536 /* If transitioning to allow "search", reset all history
1537 * bitmaps and stats in active table (this will become the new
1538 * "search" table). */
1539 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1540 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1546 * setup rate table in uCode
1548 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1549 struct ieee80211_sta *sta,
1550 struct iwl_lq_sta *lq_sta,
1551 struct rs_rate *rate)
1553 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1554 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1557 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1558 struct iwl_lq_sta *lq_sta,
1559 struct ieee80211_sta *sta,
1560 struct iwl_scale_tbl_info *tbl)
1563 enum rs_column next_col_id;
1564 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1565 const struct rs_tx_column *next_col;
1566 allow_column_func_t allow_func;
1567 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1568 const u16 *expected_tpt_tbl;
1569 u16 tpt, max_expected_tpt;
1571 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1572 next_col_id = curr_col->next_columns[i];
1574 if (next_col_id == RS_COLUMN_INVALID)
1577 if (lq_sta->visited_columns & BIT(next_col_id)) {
1578 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1583 next_col = &rs_tx_columns[next_col_id];
1585 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1587 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1588 next_col_id, valid_ants, next_col->ant);
1592 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1593 allow_func = next_col->checks[j];
1594 if (allow_func && !allow_func(mvm, sta, tbl))
1598 if (j != MAX_COLUMN_CHECKS) {
1600 "Skip column %d: not allowed (check %d failed)\n",
1606 tpt = lq_sta->last_tpt / 100;
1607 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1608 rs_bw_from_sta_bw(sta));
1609 if (WARN_ON_ONCE(!expected_tpt_tbl))
1612 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1613 if (max_rate == IWL_RATE_INVALID) {
1615 "Skip column %d: no rate is allowed in this column\n",
1620 max_expected_tpt = expected_tpt_tbl[max_rate];
1621 if (tpt >= max_expected_tpt) {
1623 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1624 next_col_id, max_expected_tpt, tpt);
1629 "Found potential column %d. Max expected %d current %d\n",
1630 next_col_id, max_expected_tpt, tpt);
1634 if (i == MAX_NEXT_COLUMNS)
1635 return RS_COLUMN_INVALID;
1640 static int rs_switch_to_column(struct iwl_mvm *mvm,
1641 struct iwl_lq_sta *lq_sta,
1642 struct ieee80211_sta *sta,
1643 enum rs_column col_id)
1645 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1646 struct iwl_scale_tbl_info *search_tbl =
1647 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1648 struct rs_rate *rate = &search_tbl->rate;
1649 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1650 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1651 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1652 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1653 unsigned long rate_mask = 0;
1656 memcpy(search_tbl, tbl, sz);
1658 rate->sgi = column->sgi;
1659 rate->ant = column->ant;
1661 if (column->mode == RS_LEGACY) {
1662 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1663 rate->type = LQ_LEGACY_A;
1665 rate->type = LQ_LEGACY_G;
1667 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1669 rate_mask = lq_sta->active_legacy_rate;
1670 } else if (column->mode == RS_SISO) {
1671 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1672 rate_mask = lq_sta->active_siso_rate;
1673 } else if (column->mode == RS_MIMO2) {
1674 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1675 rate_mask = lq_sta->active_mimo2_rate;
1677 WARN_ON_ONCE("Bad column mode");
1680 if (column->mode != RS_LEGACY) {
1681 rate->bw = rs_bw_from_sta_bw(sta);
1682 rate->ldpc = lq_sta->ldpc;
1685 search_tbl->column = col_id;
1686 rs_set_expected_tpt_table(lq_sta, search_tbl);
1688 lq_sta->visited_columns |= BIT(col_id);
1690 /* Get the best matching rate if we're changing modes. e.g.
1691 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1693 if (curr_column->mode != column->mode) {
1694 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1695 rate_mask, rate->index);
1697 if ((rate_idx == IWL_RATE_INVALID) ||
1698 !(BIT(rate_idx) & rate_mask)) {
1700 "can not switch with index %d"
1702 rate_idx, rate_mask);
1707 rate->index = rate_idx;
1710 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1711 col_id, rate->index);
1716 rate->type = LQ_NONE;
1720 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1721 struct iwl_scale_tbl_info *tbl,
1722 s32 sr, int low, int high,
1724 int low_tpt, int high_tpt)
1726 enum rs_action action = RS_ACTION_STAY;
1728 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1729 (current_tpt == 0)) {
1731 "Decrease rate because of low SR\n");
1732 return RS_ACTION_DOWNSCALE;
1735 if ((low_tpt == IWL_INVALID_VALUE) &&
1736 (high_tpt == IWL_INVALID_VALUE) &&
1737 (high != IWL_RATE_INVALID)) {
1739 "No data about high/low rates. Increase rate\n");
1740 return RS_ACTION_UPSCALE;
1743 if ((high_tpt == IWL_INVALID_VALUE) &&
1744 (high != IWL_RATE_INVALID) &&
1745 (low_tpt != IWL_INVALID_VALUE) &&
1746 (low_tpt < current_tpt)) {
1748 "No data about high rate and low rate is worse. Increase rate\n");
1749 return RS_ACTION_UPSCALE;
1752 if ((high_tpt != IWL_INVALID_VALUE) &&
1753 (high_tpt > current_tpt)) {
1755 "Higher rate is better. Increate rate\n");
1756 return RS_ACTION_UPSCALE;
1759 if ((low_tpt != IWL_INVALID_VALUE) &&
1760 (high_tpt != IWL_INVALID_VALUE) &&
1761 (low_tpt < current_tpt) &&
1762 (high_tpt < current_tpt)) {
1764 "Both high and low are worse. Maintain rate\n");
1765 return RS_ACTION_STAY;
1768 if ((low_tpt != IWL_INVALID_VALUE) &&
1769 (low_tpt > current_tpt)) {
1771 "Lower rate is better\n");
1772 action = RS_ACTION_DOWNSCALE;
1776 if ((low_tpt == IWL_INVALID_VALUE) &&
1777 (low != IWL_RATE_INVALID)) {
1779 "No data about lower rate\n");
1780 action = RS_ACTION_DOWNSCALE;
1784 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1787 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1788 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1790 "SR is above NO DECREASE. Avoid downscale\n");
1791 action = RS_ACTION_STAY;
1792 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1794 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1795 action = RS_ACTION_STAY;
1797 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1804 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1805 struct iwl_lq_sta *lq_sta)
1807 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1808 struct ieee80211_vif *vif = mvmsta->vif;
1809 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1812 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1813 * supports STBC of at least 1*SS
1818 if (!mvm->ps_disabled && !sta_ps_disabled)
1821 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1827 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1828 int *weaker, int *stronger)
1830 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1831 if (*weaker > TPC_MAX_REDUCTION)
1832 *weaker = TPC_INVALID;
1834 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1836 *stronger = TPC_INVALID;
1839 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1840 struct rs_rate *rate, enum ieee80211_band band)
1842 int index = rate->index;
1843 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1844 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1847 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1848 cam, sta_ps_disabled);
1850 * allow tpc only if power management is enabled, or bt coex
1851 * activity grade allows it and we are on 2.4Ghz.
1853 if ((cam || sta_ps_disabled) &&
1854 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1857 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1858 if (is_legacy(rate))
1859 return index == IWL_RATE_54M_INDEX;
1861 return index == IWL_RATE_MCS_7_INDEX;
1863 return index == IWL_RATE_MCS_7_INDEX ||
1864 index == IWL_RATE_MCS_8_INDEX ||
1865 index == IWL_RATE_MCS_9_INDEX;
1873 TPC_ACTION_DECREASE,
1874 TPC_ACTION_INCREASE,
1875 TPC_ACTION_NO_RESTIRCTION,
1878 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1879 s32 sr, int weak, int strong,
1881 int weak_tpt, int strong_tpt)
1883 /* stay until we have valid tpt */
1884 if (current_tpt == IWL_INVALID_VALUE) {
1885 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1886 return TPC_ACTION_STAY;
1889 /* Too many failures, increase txp */
1890 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1892 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1893 return TPC_ACTION_NO_RESTIRCTION;
1896 /* try decreasing first if applicable */
1897 if (weak != TPC_INVALID) {
1898 if (weak_tpt == IWL_INVALID_VALUE &&
1899 (strong_tpt == IWL_INVALID_VALUE ||
1900 current_tpt >= strong_tpt)) {
1902 "no weak txp measurement. decrease txp\n");
1903 return TPC_ACTION_DECREASE;
1906 if (weak_tpt > current_tpt) {
1908 "lower txp has better tpt. decrease txp\n");
1909 return TPC_ACTION_DECREASE;
1913 /* next, increase if needed */
1914 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1915 strong != TPC_INVALID) {
1916 if (weak_tpt == IWL_INVALID_VALUE &&
1917 strong_tpt != IWL_INVALID_VALUE &&
1918 current_tpt < strong_tpt) {
1920 "higher txp has better tpt. increase txp\n");
1921 return TPC_ACTION_INCREASE;
1924 if (weak_tpt < current_tpt &&
1925 (strong_tpt == IWL_INVALID_VALUE ||
1926 strong_tpt > current_tpt)) {
1928 "lower txp has worse tpt. increase txp\n");
1929 return TPC_ACTION_INCREASE;
1933 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1934 return TPC_ACTION_STAY;
1937 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1938 struct ieee80211_sta *sta,
1939 struct iwl_lq_sta *lq_sta,
1940 struct iwl_scale_tbl_info *tbl)
1942 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1943 struct ieee80211_vif *vif = mvm_sta->vif;
1944 struct ieee80211_chanctx_conf *chanctx_conf;
1945 enum ieee80211_band band;
1946 struct iwl_rate_scale_data *window;
1947 struct rs_rate *rate = &tbl->rate;
1948 enum tpc_action action;
1950 u8 cur = lq_sta->lq.reduced_tpc;
1953 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1955 #ifdef CONFIG_MAC80211_DEBUGFS
1956 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1957 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1958 lq_sta->pers.dbg_fixed_txp_reduction);
1959 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1960 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1965 chanctx_conf = rcu_dereference(vif->chanctx_conf);
1966 if (WARN_ON(!chanctx_conf))
1967 band = IEEE80211_NUM_BANDS;
1969 band = chanctx_conf->def.chan->band;
1972 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1974 "tpc is not allowed. remove txp restrictions\n");
1975 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1976 return cur != TPC_NO_REDUCTION;
1979 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1981 /* Collect measured throughputs for current and adjacent rates */
1982 window = tbl->tpc_win;
1983 sr = window[cur].success_ratio;
1984 current_tpt = window[cur].average_tpt;
1985 if (weak != TPC_INVALID)
1986 weak_tpt = window[weak].average_tpt;
1987 if (strong != TPC_INVALID)
1988 strong_tpt = window[strong].average_tpt;
1991 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1992 cur, current_tpt, sr, weak, strong,
1993 weak_tpt, strong_tpt);
1995 action = rs_get_tpc_action(mvm, sr, weak, strong,
1996 current_tpt, weak_tpt, strong_tpt);
1998 /* override actions if we are on the edge */
1999 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2000 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2001 action = TPC_ACTION_STAY;
2002 } else if (strong == TPC_INVALID &&
2003 (action == TPC_ACTION_INCREASE ||
2004 action == TPC_ACTION_NO_RESTIRCTION)) {
2005 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2006 action = TPC_ACTION_STAY;
2010 case TPC_ACTION_DECREASE:
2011 lq_sta->lq.reduced_tpc = weak;
2013 case TPC_ACTION_INCREASE:
2014 lq_sta->lq.reduced_tpc = strong;
2016 case TPC_ACTION_NO_RESTIRCTION:
2017 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2019 case TPC_ACTION_STAY:
2027 * Do rate scaling and search for new modulation mode.
2029 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2030 struct ieee80211_sta *sta,
2031 struct iwl_lq_sta *lq_sta,
2034 int low = IWL_RATE_INVALID;
2035 int high = IWL_RATE_INVALID;
2037 struct iwl_rate_scale_data *window = NULL;
2038 int current_tpt = IWL_INVALID_VALUE;
2039 int low_tpt = IWL_INVALID_VALUE;
2040 int high_tpt = IWL_INVALID_VALUE;
2042 enum rs_action scale_action = RS_ACTION_STAY;
2045 struct iwl_scale_tbl_info *tbl, *tbl1;
2050 u8 prev_agg = lq_sta->is_agg;
2051 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2052 struct iwl_mvm_tid_data *tid_data;
2053 struct rs_rate *rate;
2055 lq_sta->is_agg = !!sta_priv->agg_tids;
2058 * Select rate-scale / modulation-mode table to work with in
2059 * the rest of this function: "search" if searching for better
2060 * modulation mode, or "active" if doing rate scaling within a mode.
2062 if (!lq_sta->search_better_tbl)
2063 active_tbl = lq_sta->active_tbl;
2065 active_tbl = 1 - lq_sta->active_tbl;
2067 tbl = &(lq_sta->lq_info[active_tbl]);
2070 if (prev_agg != lq_sta->is_agg) {
2072 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2073 prev_agg, lq_sta->is_agg);
2074 rs_set_expected_tpt_table(lq_sta, tbl);
2075 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2078 /* current tx rate */
2079 index = lq_sta->last_txrate_idx;
2081 /* rates available for this association, and for modulation mode */
2082 rate_mask = rs_get_supported_rates(lq_sta, rate);
2084 if (!(BIT(index) & rate_mask)) {
2085 IWL_ERR(mvm, "Current Rate is not valid\n");
2086 if (lq_sta->search_better_tbl) {
2087 /* revert to active table if search table is not valid*/
2088 rate->type = LQ_NONE;
2089 lq_sta->search_better_tbl = 0;
2090 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2091 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2096 /* Get expected throughput table and history window for current rate */
2097 if (!tbl->expected_tpt) {
2098 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2102 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2103 window = &(tbl->win[index]);
2106 * If there is not enough history to calculate actual average
2107 * throughput, keep analyzing results of more tx frames, without
2108 * changing rate or mode (bypass most of the rest of this function).
2109 * Set up new rate table in uCode only if old rate is not supported
2110 * in current association (use new rate found above).
2112 fail_count = window->counter - window->success_counter;
2113 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2114 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2116 "(%s: %d): Test Window: succ %d total %d\n",
2117 rs_pretty_lq_type(rate->type),
2118 index, window->success_counter, window->counter);
2120 /* Can't calculate this yet; not enough history */
2121 window->average_tpt = IWL_INVALID_VALUE;
2123 /* Should we stay with this modulation mode,
2124 * or search for a new one? */
2125 rs_stay_in_table(lq_sta, false);
2129 /* Else we have enough samples; calculate estimate of
2130 * actual average throughput */
2131 if (window->average_tpt != ((window->success_ratio *
2132 tbl->expected_tpt[index] + 64) / 128)) {
2133 window->average_tpt = ((window->success_ratio *
2134 tbl->expected_tpt[index] + 64) / 128);
2137 /* If we are searching for better modulation mode, check success. */
2138 if (lq_sta->search_better_tbl) {
2139 /* If good success, continue using the "search" mode;
2140 * no need to send new link quality command, since we're
2141 * continuing to use the setup that we've been trying. */
2142 if (window->average_tpt > lq_sta->last_tpt) {
2144 "SWITCHING TO NEW TABLE SR: %d "
2145 "cur-tpt %d old-tpt %d\n",
2146 window->success_ratio,
2147 window->average_tpt,
2150 /* Swap tables; "search" becomes "active" */
2151 lq_sta->active_tbl = active_tbl;
2152 current_tpt = window->average_tpt;
2153 /* Else poor success; go back to mode in "active" table */
2156 "GOING BACK TO THE OLD TABLE: SR %d "
2157 "cur-tpt %d old-tpt %d\n",
2158 window->success_ratio,
2159 window->average_tpt,
2162 /* Nullify "search" table */
2163 rate->type = LQ_NONE;
2165 /* Revert to "active" table */
2166 active_tbl = lq_sta->active_tbl;
2167 tbl = &(lq_sta->lq_info[active_tbl]);
2169 /* Revert to "active" rate and throughput info */
2170 index = tbl->rate.index;
2171 current_tpt = lq_sta->last_tpt;
2173 /* Need to set up a new rate table in uCode */
2177 /* Either way, we've made a decision; modulation mode
2178 * search is done, allow rate adjustment next time. */
2179 lq_sta->search_better_tbl = 0;
2180 done_search = 1; /* Don't switch modes below! */
2184 /* (Else) not in search of better modulation mode, try for better
2185 * starting rate, while staying in this mode. */
2186 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2187 low = high_low & 0xff;
2188 high = (high_low >> 8) & 0xff;
2190 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2192 sr = window->success_ratio;
2194 /* Collect measured throughputs for current and adjacent rates */
2195 current_tpt = window->average_tpt;
2196 if (low != IWL_RATE_INVALID)
2197 low_tpt = tbl->win[low].average_tpt;
2198 if (high != IWL_RATE_INVALID)
2199 high_tpt = tbl->win[high].average_tpt;
2202 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2203 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2204 low, high, low_tpt, high_tpt);
2206 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2207 current_tpt, low_tpt, high_tpt);
2209 /* Force a search in case BT doesn't like us being in MIMO */
2210 if (is_mimo(rate) &&
2211 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2213 "BT Coex forbids MIMO. Search for new config\n");
2214 rs_stay_in_table(lq_sta, true);
2218 switch (scale_action) {
2219 case RS_ACTION_DOWNSCALE:
2220 /* Decrease starting rate, update uCode's rate table */
2221 if (low != IWL_RATE_INVALID) {
2226 "At the bottom rate. Can't decrease\n");
2230 case RS_ACTION_UPSCALE:
2231 /* Increase starting rate, update uCode's rate table */
2232 if (high != IWL_RATE_INVALID) {
2237 "At the top rate. Can't increase\n");
2241 case RS_ACTION_STAY:
2243 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2244 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2251 /* Replace uCode's rate table for the destination station. */
2253 tbl->rate.index = index;
2254 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2257 rs_stay_in_table(lq_sta, false);
2260 * Search for new modulation mode if we're:
2261 * 1) Not changing rates right now
2262 * 2) Not just finishing up a search
2263 * 3) Allowing a new search
2265 if (!update_lq && !done_search &&
2266 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2267 && window->counter) {
2268 enum rs_column next_column;
2270 /* Save current throughput to compare with "search" throughput*/
2271 lq_sta->last_tpt = current_tpt;
2274 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2275 update_lq, done_search, lq_sta->rs_state,
2278 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2279 if (next_column != RS_COLUMN_INVALID) {
2280 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2283 lq_sta->search_better_tbl = 1;
2286 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2287 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2290 /* If new "search" mode was selected, set up in uCode table */
2291 if (lq_sta->search_better_tbl) {
2292 /* Access the "search" table, clear its history. */
2293 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2294 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2296 /* Use new "search" start rate */
2297 index = tbl->rate.index;
2299 rs_dump_rate(mvm, &tbl->rate,
2300 "Switch to SEARCH TABLE:");
2301 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2302 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2308 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2309 /* If the "active" (non-search) mode was legacy,
2310 * and we've tried switching antennas,
2311 * but we haven't been able to try HT modes (not available),
2312 * stay with best antenna legacy modulation for a while
2313 * before next round of mode comparisons. */
2314 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2315 if (is_legacy(&tbl1->rate)) {
2316 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2318 if (tid != IWL_MAX_TID_COUNT) {
2319 tid_data = &sta_priv->tid_data[tid];
2320 if (tid_data->state != IWL_AGG_OFF) {
2322 "Stop aggregation on tid %d\n",
2324 ieee80211_stop_tx_ba_session(sta, tid);
2327 rs_set_stay_in_table(mvm, 1, lq_sta);
2329 /* If we're in an HT mode, and all 3 mode switch actions
2330 * have been tried and compared, stay in this best modulation
2331 * mode for a while before next round of mode comparisons. */
2332 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2333 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2334 (tid != IWL_MAX_TID_COUNT)) {
2335 tid_data = &sta_priv->tid_data[tid];
2336 if (tid_data->state == IWL_AGG_OFF) {
2338 "try to aggregate tid %d\n",
2340 rs_tl_turn_on_agg(mvm, tid,
2344 rs_set_stay_in_table(mvm, 0, lq_sta);
2349 lq_sta->last_txrate_idx = index;
2352 struct rs_init_rate_info {
2357 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2358 { -60, IWL_RATE_54M_INDEX },
2359 { -64, IWL_RATE_48M_INDEX },
2360 { -68, IWL_RATE_36M_INDEX },
2361 { -80, IWL_RATE_24M_INDEX },
2362 { -84, IWL_RATE_18M_INDEX },
2363 { -85, IWL_RATE_12M_INDEX },
2364 { -86, IWL_RATE_11M_INDEX },
2365 { -88, IWL_RATE_5M_INDEX },
2366 { -90, IWL_RATE_2M_INDEX },
2367 { S8_MIN, IWL_RATE_1M_INDEX },
2370 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2371 { -60, IWL_RATE_54M_INDEX },
2372 { -64, IWL_RATE_48M_INDEX },
2373 { -72, IWL_RATE_36M_INDEX },
2374 { -80, IWL_RATE_24M_INDEX },
2375 { -84, IWL_RATE_18M_INDEX },
2376 { -85, IWL_RATE_12M_INDEX },
2377 { -87, IWL_RATE_9M_INDEX },
2378 { S8_MIN, IWL_RATE_6M_INDEX },
2381 /* Choose an initial legacy rate and antenna to use based on the RSSI
2384 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2385 struct iwl_lq_sta *lq_sta,
2386 enum ieee80211_band band,
2387 struct rs_rate *rate)
2390 s8 best_rssi = S8_MIN;
2391 u8 best_ant = ANT_NONE;
2392 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2393 const struct rs_init_rate_info *initial_rates;
2395 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2396 if (!(lq_sta->pers.chains & BIT(i)))
2399 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2400 best_rssi = lq_sta->pers.chain_signal[i];
2405 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2406 rs_pretty_ant(best_ant), best_rssi);
2408 if (best_ant != ANT_A && best_ant != ANT_B)
2409 rate->ant = first_antenna(valid_tx_ant);
2411 rate->ant = best_ant;
2415 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2417 rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2420 if (band == IEEE80211_BAND_5GHZ) {
2421 rate->type = LQ_LEGACY_A;
2422 initial_rates = rs_init_rates_5ghz;
2423 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2425 rate->type = LQ_LEGACY_G;
2426 initial_rates = rs_init_rates_24ghz;
2427 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2430 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2431 for (i = 0; i < nentries; i++) {
2432 int rate_idx = initial_rates[i].rate_idx;
2433 if ((best_rssi >= initial_rates[i].rssi) &&
2434 (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2435 rate->index = rate_idx;
2441 IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2442 rs_pretty_ant(rate->ant));
2445 /* Save info about RSSI of last Rx */
2446 void rs_update_last_rssi(struct iwl_mvm *mvm,
2447 struct iwl_lq_sta *lq_sta,
2448 struct ieee80211_rx_status *rx_status)
2450 lq_sta->pers.chains = rx_status->chains;
2451 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2452 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2453 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2457 * rs_initialize_lq - Initialize a station's hardware rate table
2459 * The uCode's station table contains a table of fallback rates
2460 * for automatic fallback during transmission.
2462 * NOTE: This sets up a default set of values. These will be replaced later
2463 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2466 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2467 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2468 * which requires station table entry to exist).
2470 static void rs_initialize_lq(struct iwl_mvm *mvm,
2471 struct ieee80211_sta *sta,
2472 struct iwl_lq_sta *lq_sta,
2473 enum ieee80211_band band,
2476 struct iwl_scale_tbl_info *tbl;
2477 struct rs_rate *rate;
2480 if (!sta || !lq_sta)
2483 if (!lq_sta->search_better_tbl)
2484 active_tbl = lq_sta->active_tbl;
2486 active_tbl = 1 - lq_sta->active_tbl;
2488 tbl = &(lq_sta->lq_info[active_tbl]);
2491 rs_get_initial_rate(mvm, lq_sta, band, rate);
2492 lq_sta->last_txrate_idx = rate->index;
2494 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2495 if (rate->ant == ANT_A)
2496 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2498 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2500 rs_set_expected_tpt_table(lq_sta, tbl);
2501 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2502 /* TODO restore station should remember the lq cmd */
2503 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2506 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2507 struct ieee80211_tx_rate_control *txrc)
2509 struct sk_buff *skb = txrc->skb;
2510 struct iwl_op_mode *op_mode __maybe_unused =
2511 (struct iwl_op_mode *)mvm_r;
2512 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2513 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2514 struct iwl_lq_sta *lq_sta = mvm_sta;
2516 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2518 /* Treat uninitialized rate scaling data same as non-existing. */
2519 if (lq_sta && !lq_sta->pers.drv) {
2520 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2524 /* Send management frames and NO_ACK data using lowest rate. */
2525 if (rate_control_send_low(sta, mvm_sta, txrc))
2528 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2529 info->band, &info->control.rates[0]);
2531 info->control.rates[0].count = 1;
2534 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2537 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2538 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2539 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2540 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2542 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2544 lq_sta->pers.drv = mvm;
2545 #ifdef CONFIG_MAC80211_DEBUGFS
2546 lq_sta->pers.dbg_fixed_rate = 0;
2547 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2549 lq_sta->pers.chains = 0;
2550 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2552 return &sta_priv->lq_sta;
2555 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2558 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2559 (0x3 << (2 * (nss - 1)));
2560 rx_mcs >>= (2 * (nss - 1));
2562 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2563 return IWL_RATE_MCS_7_INDEX;
2564 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2565 return IWL_RATE_MCS_8_INDEX;
2566 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2567 return IWL_RATE_MCS_9_INDEX;
2569 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2573 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2574 struct ieee80211_sta_vht_cap *vht_cap,
2575 struct iwl_lq_sta *lq_sta)
2578 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2580 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2581 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2582 if (i == IWL_RATE_9M_INDEX)
2585 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2586 if (i == IWL_RATE_MCS_9_INDEX &&
2587 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2590 lq_sta->active_siso_rate |= BIT(i);
2594 if (sta->rx_nss < 2)
2597 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2598 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2599 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2600 if (i == IWL_RATE_9M_INDEX)
2603 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2604 if (i == IWL_RATE_MCS_9_INDEX &&
2605 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2608 lq_sta->active_mimo2_rate |= BIT(i);
2613 #ifdef CONFIG_IWLWIFI_DEBUGFS
2614 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2615 struct iwl_mvm_frame_stats *stats)
2617 spin_lock_bh(&mvm->drv_stats_lock);
2618 memset(stats, 0, sizeof(*stats));
2619 spin_unlock_bh(&mvm->drv_stats_lock);
2622 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2623 struct iwl_mvm_frame_stats *stats,
2626 u8 nss = 0, mcs = 0;
2628 spin_lock(&mvm->drv_stats_lock);
2631 stats->agg_frames++;
2633 stats->success_frames++;
2635 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2636 case RATE_MCS_CHAN_WIDTH_20:
2637 stats->bw_20_frames++;
2639 case RATE_MCS_CHAN_WIDTH_40:
2640 stats->bw_40_frames++;
2642 case RATE_MCS_CHAN_WIDTH_80:
2643 stats->bw_80_frames++;
2646 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2649 if (rate & RATE_MCS_HT_MSK) {
2651 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2652 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2653 } else if (rate & RATE_MCS_VHT_MSK) {
2654 stats->vht_frames++;
2655 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2656 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2657 RATE_VHT_MCS_NSS_POS) + 1;
2659 stats->legacy_frames++;
2663 stats->siso_frames++;
2665 stats->mimo2_frames++;
2667 if (rate & RATE_MCS_SGI_MSK)
2668 stats->sgi_frames++;
2670 stats->ngi_frames++;
2672 stats->last_rates[stats->last_frame_idx] = rate;
2673 stats->last_frame_idx = (stats->last_frame_idx + 1) %
2674 ARRAY_SIZE(stats->last_rates);
2676 spin_unlock(&mvm->drv_stats_lock);
2681 * Called after adding a new station to initialize rate scaling
2683 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2684 enum ieee80211_band band, bool init)
2687 struct ieee80211_hw *hw = mvm->hw;
2688 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2689 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2690 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
2691 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2692 struct ieee80211_supported_band *sband;
2693 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2695 /* clear all non-persistent lq data */
2696 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2698 sband = hw->wiphy->bands[band];
2700 lq_sta->lq.sta_id = sta_priv->sta_id;
2702 for (j = 0; j < LQ_SIZE; j++)
2703 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2705 lq_sta->flush_timer = 0;
2706 lq_sta->last_tx = jiffies;
2709 "LQ: *** rate scale station global init for station %d ***\n",
2711 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2712 * the lowest or the highest rate.. Could consider using RSSI from
2713 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2716 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2717 lq_sta->band = sband->band;
2719 * active legacy rates as per supported rates bitmap
2721 supp = sta->supp_rates[sband->band];
2722 lq_sta->active_legacy_rate = 0;
2723 for_each_set_bit(i, &supp, BITS_PER_LONG)
2724 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2726 /* TODO: should probably account for rx_highest for both HT/VHT */
2727 if (!vht_cap || !vht_cap->vht_supported) {
2728 /* active_siso_rate mask includes 9 MBits (bit 5),
2729 * and CCK (bits 0-3), supp_rates[] does not;
2730 * shift to convert format, force 9 MBits off.
2732 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2733 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2734 lq_sta->active_siso_rate &= ~((u16)0x2);
2735 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2738 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2739 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2740 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2741 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2743 lq_sta->is_vht = false;
2744 if (mvm->cfg->ht_params->ldpc &&
2745 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2746 lq_sta->ldpc = true;
2748 if (mvm->cfg->ht_params->stbc &&
2749 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2750 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2751 lq_sta->stbc = true;
2753 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2754 lq_sta->is_vht = true;
2756 if (mvm->cfg->ht_params->ldpc &&
2757 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2758 lq_sta->ldpc = true;
2760 if (mvm->cfg->ht_params->stbc &&
2761 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2762 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2763 lq_sta->stbc = true;
2766 if (IWL_MVM_RS_DISABLE_MIMO)
2767 lq_sta->active_mimo2_rate = 0;
2769 lq_sta->max_legacy_rate_idx =
2770 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2771 lq_sta->max_siso_rate_idx =
2772 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2773 lq_sta->max_mimo2_rate_idx =
2774 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2777 "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC%d\n",
2778 lq_sta->active_legacy_rate,
2779 lq_sta->active_siso_rate,
2780 lq_sta->active_mimo2_rate,
2781 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc);
2782 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2783 lq_sta->max_legacy_rate_idx,
2784 lq_sta->max_siso_rate_idx,
2785 lq_sta->max_mimo2_rate_idx);
2787 /* These values will be overridden later */
2788 lq_sta->lq.single_stream_ant_msk =
2789 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
2790 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2792 /* as default allow aggregation for all tids */
2793 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2795 #ifdef CONFIG_IWLWIFI_DEBUGFS
2796 iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2798 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2801 static void rs_rate_update(void *mvm_r,
2802 struct ieee80211_supported_band *sband,
2803 struct cfg80211_chan_def *chandef,
2804 struct ieee80211_sta *sta, void *priv_sta,
2808 struct iwl_op_mode *op_mode =
2809 (struct iwl_op_mode *)mvm_r;
2810 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2812 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2813 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2814 ieee80211_stop_tx_ba_session(sta, tid);
2816 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2819 #ifdef CONFIG_MAC80211_DEBUGFS
2820 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2821 struct iwl_lq_cmd *lq_cmd,
2822 enum ieee80211_band band,
2825 struct rs_rate rate;
2827 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2828 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2829 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2831 for (i = 0; i < num_rates; i++)
2832 lq_cmd->rs_table[i] = ucode_rate_le32;
2834 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2837 lq_cmd->mimo_delim = num_rates - 1;
2839 lq_cmd->mimo_delim = 0;
2841 lq_cmd->reduced_tpc = 0;
2843 if (num_of_ant(ant) == 1)
2844 lq_cmd->single_stream_ant_msk = ant;
2846 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2848 #endif /* CONFIG_MAC80211_DEBUGFS */
2850 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2851 struct iwl_lq_sta *lq_sta,
2852 struct rs_rate *rate,
2853 __le32 *rs_table, int *rs_table_index,
2854 int num_rates, int num_retries,
2855 u8 valid_tx_ant, bool toggle_ant)
2859 bool bottom_reached = false;
2860 int prev_rate_idx = rate->index;
2861 int end = LINK_QUAL_MAX_RETRY_NUM;
2862 int index = *rs_table_index;
2864 for (i = 0; i < num_rates && index < end; i++) {
2865 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2866 for (j = 0; j < num_retries && index < end; j++, index++)
2867 rs_table[index] = ucode_rate;
2870 rs_toggle_antenna(valid_tx_ant, rate);
2872 prev_rate_idx = rate->index;
2873 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2874 if (bottom_reached && !is_legacy(rate))
2878 if (!bottom_reached)
2879 rate->index = prev_rate_idx;
2881 *rs_table_index = index;
2884 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2885 * column the rate table should look like this:
2887 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2888 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2889 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2890 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2891 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2892 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2893 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2894 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2895 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2896 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2897 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2898 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2899 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2900 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2901 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2902 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2904 static void rs_build_rates_table(struct iwl_mvm *mvm,
2905 struct ieee80211_sta *sta,
2906 struct iwl_lq_sta *lq_sta,
2907 const struct rs_rate *initial_rate)
2909 struct rs_rate rate;
2910 int num_rates, num_retries, index = 0;
2911 u8 valid_tx_ant = 0;
2912 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2913 bool toggle_ant = false;
2915 memcpy(&rate, initial_rate, sizeof(rate));
2917 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2918 rate.stbc = rs_stbc_allow(mvm, sta, lq_sta);
2920 if (is_siso(&rate)) {
2921 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
2922 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2923 } else if (is_mimo(&rate)) {
2924 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
2925 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
2927 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
2928 num_retries = IWL_MVM_RS_LEGACY_RETRIES_PER_RATE;
2932 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2933 num_rates, num_retries, valid_tx_ant,
2936 rs_get_lower_rate_down_column(lq_sta, &rate);
2938 if (is_siso(&rate)) {
2939 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
2940 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
2941 lq_cmd->mimo_delim = index;
2942 } else if (is_legacy(&rate)) {
2943 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2944 num_retries = IWL_MVM_RS_LEGACY_RETRIES_PER_RATE;
2951 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2952 num_rates, num_retries, valid_tx_ant,
2955 rs_get_lower_rate_down_column(lq_sta, &rate);
2957 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
2958 num_retries = IWL_MVM_RS_LEGACY_RETRIES_PER_RATE;
2960 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2961 num_rates, num_retries, valid_tx_ant,
2966 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2967 struct ieee80211_sta *sta,
2968 struct iwl_lq_sta *lq_sta,
2969 const struct rs_rate *initial_rate)
2971 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2972 struct iwl_mvm_sta *mvmsta;
2973 struct iwl_mvm_vif *mvmvif;
2975 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
2976 lq_cmd->agg_time_limit =
2977 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
2979 #ifdef CONFIG_MAC80211_DEBUGFS
2980 if (lq_sta->pers.dbg_fixed_rate) {
2981 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2983 lq_sta->pers.dbg_fixed_rate);
2987 if (WARN_ON_ONCE(!sta || !initial_rate))
2990 rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
2992 if (num_of_ant(initial_rate->ant) == 1)
2993 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2995 mvmsta = iwl_mvm_sta_from_mac80211(sta);
2996 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
2998 if (num_of_ant(initial_rate->ant) == 1)
2999 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3001 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3004 * In case of low latency, tell the firwmare to leave a frame in the
3005 * Tx Fifo so that it can start a transaction in the same TxOP. This
3006 * basically allows the firmware to send bursts.
3008 if (iwl_mvm_vif_low_latency(mvmvif)) {
3009 lq_cmd->agg_frame_cnt_limit--;
3011 if (mvm->low_latency_agg_frame_limit)
3012 lq_cmd->agg_frame_cnt_limit =
3013 min(lq_cmd->agg_frame_cnt_limit,
3014 mvm->low_latency_agg_frame_limit);
3017 if (mvmsta->vif->p2p)
3018 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3020 lq_cmd->agg_time_limit =
3021 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3024 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3028 /* rate scale requires free function to be implemented */
3029 static void rs_free(void *mvm_rate)
3034 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3037 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3038 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3040 IWL_DEBUG_RATE(mvm, "enter\n");
3041 IWL_DEBUG_RATE(mvm, "leave\n");
3044 #ifdef CONFIG_MAC80211_DEBUGFS
3045 int rs_pretty_print_rate(char *buf, const u32 rate)
3049 u8 mcs = 0, nss = 0;
3050 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3052 if (!(rate & RATE_MCS_HT_MSK) &&
3053 !(rate & RATE_MCS_VHT_MSK)) {
3054 int index = iwl_hwrate_to_plcp_idx(rate);
3056 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3058 index == IWL_RATE_INVALID ? "BAD" :
3059 iwl_rate_mcs[index].mbps);
3062 if (rate & RATE_MCS_VHT_MSK) {
3064 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3065 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3066 >> RATE_VHT_MCS_NSS_POS) + 1;
3067 } else if (rate & RATE_MCS_HT_MSK) {
3069 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3071 type = "Unknown"; /* shouldn't happen */
3074 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3075 case RATE_MCS_CHAN_WIDTH_20:
3078 case RATE_MCS_CHAN_WIDTH_40:
3081 case RATE_MCS_CHAN_WIDTH_80:
3084 case RATE_MCS_CHAN_WIDTH_160:
3091 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3092 type, rs_pretty_ant(ant), bw, mcs, nss,
3093 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3094 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3095 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3096 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3097 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3101 * Program the device to use fixed rate for frame transmit
3102 * This is for debugging/testing only
3103 * once the device start use fixed rate, we need to reload the module
3104 * to being back the normal operation.
3106 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3107 struct iwl_lq_sta *lq_sta)
3109 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3110 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3111 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3113 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3114 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3116 if (lq_sta->pers.dbg_fixed_rate) {
3117 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3118 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3122 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3123 const char __user *user_buf, size_t count, loff_t *ppos)
3125 struct iwl_lq_sta *lq_sta = file->private_data;
3126 struct iwl_mvm *mvm;
3131 mvm = lq_sta->pers.drv;
3132 memset(buf, 0, sizeof(buf));
3133 buf_size = min(count, sizeof(buf) - 1);
3134 if (copy_from_user(buf, user_buf, buf_size))
3137 if (sscanf(buf, "%x", &parsed_rate) == 1)
3138 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3140 lq_sta->pers.dbg_fixed_rate = 0;
3142 rs_program_fix_rate(mvm, lq_sta);
3147 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3148 char __user *user_buf, size_t count, loff_t *ppos)
3155 struct iwl_lq_sta *lq_sta = file->private_data;
3156 struct iwl_mvm *mvm;
3157 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3158 struct rs_rate *rate = &tbl->rate;
3159 mvm = lq_sta->pers.drv;
3160 buff = kmalloc(2048, GFP_KERNEL);
3164 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3165 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3166 lq_sta->total_failed, lq_sta->total_success,
3167 lq_sta->active_legacy_rate);
3168 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3169 lq_sta->pers.dbg_fixed_rate);
3170 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3171 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3172 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3173 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3174 desc += sprintf(buff+desc, "lq type %s\n",
3175 (is_legacy(rate)) ? "legacy" :
3176 is_vht(rate) ? "VHT" : "HT");
3177 if (!is_legacy(rate)) {
3178 desc += sprintf(buff+desc, " %s",
3179 (is_siso(rate)) ? "SISO" : "MIMO2");
3180 desc += sprintf(buff+desc, " %s",
3181 (is_ht20(rate)) ? "20MHz" :
3182 (is_ht40(rate)) ? "40MHz" :
3183 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3184 desc += sprintf(buff+desc, " %s %s %s\n",
3185 (rate->sgi) ? "SGI" : "NGI",
3186 (rate->ldpc) ? "LDPC" : "BCC",
3187 (lq_sta->is_agg) ? "AGG on" : "");
3189 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3190 lq_sta->last_rate_n_flags);
3191 desc += sprintf(buff+desc,
3192 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3194 lq_sta->lq.mimo_delim,
3195 lq_sta->lq.single_stream_ant_msk,
3196 lq_sta->lq.dual_stream_ant_msk);
3198 desc += sprintf(buff+desc,
3199 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3200 le16_to_cpu(lq_sta->lq.agg_time_limit),
3201 lq_sta->lq.agg_disable_start_th,
3202 lq_sta->lq.agg_frame_cnt_limit);
3204 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3205 desc += sprintf(buff+desc,
3206 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3207 lq_sta->lq.initial_rate_index[0],
3208 lq_sta->lq.initial_rate_index[1],
3209 lq_sta->lq.initial_rate_index[2],
3210 lq_sta->lq.initial_rate_index[3]);
3212 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3213 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3215 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3216 desc += rs_pretty_print_rate(buff+desc, r);
3219 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3224 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3225 .write = rs_sta_dbgfs_scale_table_write,
3226 .read = rs_sta_dbgfs_scale_table_read,
3227 .open = simple_open,
3228 .llseek = default_llseek,
3230 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3231 char __user *user_buf, size_t count, loff_t *ppos)
3237 struct iwl_scale_tbl_info *tbl;
3238 struct rs_rate *rate;
3239 struct iwl_lq_sta *lq_sta = file->private_data;
3241 buff = kmalloc(1024, GFP_KERNEL);
3245 for (i = 0; i < LQ_SIZE; i++) {
3246 tbl = &(lq_sta->lq_info[i]);
3248 desc += sprintf(buff+desc,
3249 "%s type=%d SGI=%d BW=%s DUP=0\n"
3251 lq_sta->active_tbl == i ? "*" : "x",
3254 is_ht20(rate) ? "20Mhz" :
3255 is_ht40(rate) ? "40Mhz" :
3256 is_ht80(rate) ? "80Mhz" : "ERR",
3258 for (j = 0; j < IWL_RATE_COUNT; j++) {
3259 desc += sprintf(buff+desc,
3260 "counter=%d success=%d %%=%d\n",
3261 tbl->win[j].counter,
3262 tbl->win[j].success_counter,
3263 tbl->win[j].success_ratio);
3266 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3271 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3272 .read = rs_sta_dbgfs_stats_table_read,
3273 .open = simple_open,
3274 .llseek = default_llseek,
3277 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3278 char __user *user_buf,
3279 size_t count, loff_t *ppos)
3281 static const char * const column_name[] = {
3282 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3283 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3284 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3285 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3286 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3287 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3288 [RS_COLUMN_MIMO2] = "MIMO2",
3289 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3292 static const char * const rate_name[] = {
3293 [IWL_RATE_1M_INDEX] = "1M",
3294 [IWL_RATE_2M_INDEX] = "2M",
3295 [IWL_RATE_5M_INDEX] = "5.5M",
3296 [IWL_RATE_11M_INDEX] = "11M",
3297 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3298 [IWL_RATE_9M_INDEX] = "9M",
3299 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3300 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3301 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3302 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3303 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3304 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3305 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3306 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3307 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3310 char *buff, *pos, *endpos;
3313 struct iwl_lq_sta *lq_sta = file->private_data;
3314 struct rs_rate_stats *stats;
3315 static const size_t bufsz = 1024;
3317 buff = kmalloc(bufsz, GFP_KERNEL);
3322 endpos = pos + bufsz;
3324 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3325 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3326 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3327 pos += scnprintf(pos, endpos - pos, "\n");
3329 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3330 pos += scnprintf(pos, endpos - pos,
3331 "%s,", column_name[col]);
3333 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3334 stats = &(lq_sta->pers.tx_stats[col][rate]);
3335 pos += scnprintf(pos, endpos - pos,
3340 pos += scnprintf(pos, endpos - pos, "\n");
3343 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3348 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3349 const char __user *user_buf,
3350 size_t count, loff_t *ppos)
3352 struct iwl_lq_sta *lq_sta = file->private_data;
3353 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3358 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3359 .read = rs_sta_dbgfs_drv_tx_stats_read,
3360 .write = rs_sta_dbgfs_drv_tx_stats_write,
3361 .open = simple_open,
3362 .llseek = default_llseek,
3365 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3367 struct iwl_lq_sta *lq_sta = mvm_sta;
3368 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3369 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3370 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3371 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3372 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3373 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3374 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3375 &lq_sta->tx_agg_tid_en);
3376 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3377 &lq_sta->pers.dbg_fixed_txp_reduction);
3380 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3386 * Initialization of rate scaling information is done by driver after
3387 * the station is added. Since mac80211 calls this function before a
3388 * station is added we ignore it.
3390 static void rs_rate_init_stub(void *mvm_r,
3391 struct ieee80211_supported_band *sband,
3392 struct cfg80211_chan_def *chandef,
3393 struct ieee80211_sta *sta, void *mvm_sta)
3397 static const struct rate_control_ops rs_mvm_ops = {
3399 .tx_status = rs_mac80211_tx_status,
3400 .get_rate = rs_get_rate,
3401 .rate_init = rs_rate_init_stub,
3404 .alloc_sta = rs_alloc_sta,
3405 .free_sta = rs_free_sta,
3406 .rate_update = rs_rate_update,
3407 #ifdef CONFIG_MAC80211_DEBUGFS
3408 .add_sta_debugfs = rs_add_debugfs,
3409 .remove_sta_debugfs = rs_remove_debugfs,
3413 int iwl_mvm_rate_control_register(void)
3415 return ieee80211_rate_control_register(&rs_mvm_ops);
3418 void iwl_mvm_rate_control_unregister(void)
3420 ieee80211_rate_control_unregister(&rs_mvm_ops);
3424 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3425 * Tx protection, according to this rquest and previous requests,
3426 * and send the LQ command.
3427 * @mvmsta: The station
3428 * @enable: Enable Tx protection?
3430 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3433 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3435 lockdep_assert_held(&mvm->mutex);
3438 if (mvmsta->tx_protection == 0)
3439 lq->flags |= LQ_FLAG_USE_RTS_MSK;
3440 mvmsta->tx_protection++;
3442 mvmsta->tx_protection--;
3443 if (mvmsta->tx_protection == 0)
3444 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3447 return iwl_mvm_send_lq_cmd(mvm, lq, false);