1 /******************************************************************************
3 * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.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 NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 3 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53 /* max allowed rate miss before sync LQ cmd */
54 #define IWL_MISSED_RATE_MAX 15
55 #define RS_STAY_IN_COLUMN_TIMEOUT (5*HZ)
58 static u8 rs_ht_to_legacy[] = {
59 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
60 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
61 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
62 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
63 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
64 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
65 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
66 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
67 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
68 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
71 static const u8 ant_toggle_lookup[] = {
72 [ANT_NONE] = ANT_NONE,
82 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
83 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
84 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
85 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
86 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
87 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
88 IWL_RATE_##rp##M_INDEX, \
89 IWL_RATE_##rn##M_INDEX }
91 #define IWL_DECLARE_MCS_RATE(s) \
92 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
93 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
94 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
95 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
96 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
97 IWL_RATE_INVM_INDEX, \
102 * rate, ht rate, prev rate, next rate
104 * If there isn't a valid next or previous rate then INV is used which
105 * maps to IWL_RATE_INVALID
108 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
109 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
110 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
111 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
112 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
113 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
114 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
115 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
116 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
117 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
118 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
119 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
120 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
121 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
122 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
123 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
126 enum rs_column_mode {
133 #define MAX_NEXT_COLUMNS 5
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_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
149 struct iwl_scale_tbl_info *tbl)
151 if (!sta->ht_cap.ht_supported)
154 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
157 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
160 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
166 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
167 struct iwl_scale_tbl_info *tbl)
169 if (!sta->ht_cap.ht_supported)
175 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
176 struct iwl_scale_tbl_info *tbl)
178 struct rs_rate *rate = &tbl->rate;
179 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
180 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
182 if (is_ht20(rate) && (ht_cap->cap &
183 IEEE80211_HT_CAP_SGI_20))
185 if (is_ht40(rate) && (ht_cap->cap &
186 IEEE80211_HT_CAP_SGI_40))
188 if (is_ht80(rate) && (vht_cap->cap &
189 IEEE80211_VHT_CAP_SHORT_GI_80))
195 static const struct rs_tx_column rs_tx_columns[] = {
196 [RS_COLUMN_LEGACY_ANT_A] = {
200 RS_COLUMN_LEGACY_ANT_B,
201 RS_COLUMN_SISO_ANT_A,
207 [RS_COLUMN_LEGACY_ANT_B] = {
211 RS_COLUMN_LEGACY_ANT_A,
212 RS_COLUMN_SISO_ANT_B,
218 [RS_COLUMN_SISO_ANT_A] = {
222 RS_COLUMN_SISO_ANT_B,
224 RS_COLUMN_SISO_ANT_A_SGI,
232 [RS_COLUMN_SISO_ANT_B] = {
236 RS_COLUMN_SISO_ANT_A,
238 RS_COLUMN_SISO_ANT_B_SGI,
246 [RS_COLUMN_SISO_ANT_A_SGI] = {
251 RS_COLUMN_SISO_ANT_B_SGI,
253 RS_COLUMN_SISO_ANT_A,
262 [RS_COLUMN_SISO_ANT_B_SGI] = {
267 RS_COLUMN_SISO_ANT_A_SGI,
269 RS_COLUMN_SISO_ANT_B,
278 [RS_COLUMN_MIMO2] = {
282 RS_COLUMN_SISO_ANT_A,
292 [RS_COLUMN_MIMO2_SGI] = {
297 RS_COLUMN_SISO_ANT_A_SGI,
310 static inline u8 rs_extract_rate(u32 rate_n_flags)
312 /* also works for HT because bits 7:6 are zero there */
313 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
316 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
320 if (rate_n_flags & RATE_MCS_HT_MSK) {
321 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
322 idx += IWL_RATE_MCS_0_INDEX;
324 /* skip 9M not supported in HT*/
325 if (idx >= IWL_RATE_9M_INDEX)
327 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
329 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
330 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
331 idx += IWL_RATE_MCS_0_INDEX;
333 /* skip 9M not supported in VHT*/
334 if (idx >= IWL_RATE_9M_INDEX)
336 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
339 /* legacy rate format, search for match in table */
341 u8 legacy_rate = rs_extract_rate(rate_n_flags);
342 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
343 if (iwl_rates[idx].plcp == legacy_rate)
350 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
352 struct ieee80211_sta *sta,
353 struct iwl_lq_sta *lq_sta);
354 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
355 struct ieee80211_sta *sta,
356 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
357 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
359 #ifdef CONFIG_MAC80211_DEBUGFS
360 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
363 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
369 * The following tables contain the expected throughput metrics for all rates
371 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
373 * where invalid entries are zeros.
375 * CCK rates are only valid in legacy table and will only be used in G
379 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
380 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
383 /* Expected TpT tables. 4 indexes:
384 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
386 static s32 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
387 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
388 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
389 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
390 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
393 static s32 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
394 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
395 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
396 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
397 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
400 static s32 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
401 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
402 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
403 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
404 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
407 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
408 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
409 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
410 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
411 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
414 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
415 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
416 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
417 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
418 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
421 static s32 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
422 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
423 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
424 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
425 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
429 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
438 { "24", "16QAM 1/2"},
439 { "36", "16QAM 3/4"},
440 { "48", "64QAM 2/3"},
441 { "54", "64QAM 3/4"},
442 { "60", "64QAM 5/6"},
445 #define MCS_INDEX_PER_STREAM (8)
447 static const char *rs_pretty_ant(u8 ant)
449 static const char * const ant_name[] = {
463 return ant_name[ant];
466 static const char *rs_pretty_lq_type(enum iwl_table_type type)
468 static const char * const lq_types[] = {
470 [LQ_LEGACY_A] = "LEGACY_A",
471 [LQ_LEGACY_G] = "LEGACY_G",
472 [LQ_HT_SISO] = "HT SISO",
473 [LQ_HT_MIMO2] = "HT MIMO",
474 [LQ_VHT_SISO] = "VHT SISO",
475 [LQ_VHT_MIMO2] = "VHT MIMO",
478 if (type < LQ_NONE || type >= LQ_MAX)
481 return lq_types[type];
484 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
487 IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
488 prefix, rs_pretty_lq_type(rate->type),
489 rate->index, rs_pretty_ant(rate->ant),
490 rate->bw, rate->sgi);
493 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
496 window->success_counter = 0;
497 window->success_ratio = IWL_INVALID_VALUE;
499 window->average_tpt = IWL_INVALID_VALUE;
502 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
504 return (ant_type & valid_antenna) == ant_type;
507 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
508 struct iwl_lq_sta *lq_data, u8 tid,
509 struct ieee80211_sta *sta)
513 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
515 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
516 if (ret == -EAGAIN) {
518 * driver and mac80211 is out of sync
519 * this might be cause by reloading firmware
520 * stop the tx ba session here
522 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
524 ieee80211_stop_tx_ba_session(sta, tid);
529 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
530 struct iwl_lq_sta *lq_data,
531 struct ieee80211_sta *sta)
533 if (tid < IWL_MAX_TID_COUNT)
534 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
536 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
537 tid, IWL_MAX_TID_COUNT);
540 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
542 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
543 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
544 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
548 * Static function to get the expected throughput from an iwl_scale_tbl_info
549 * that wraps a NULL pointer check
551 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
553 if (tbl->expected_tpt)
554 return tbl->expected_tpt[rs_index];
559 * rs_collect_tx_data - Update the success/failure sliding window
561 * We keep a sliding window of the last 62 packets transmitted
562 * at this rate. window->data contains the bitmask of successful
565 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
566 int scale_index, int attempts, int successes)
568 struct iwl_rate_scale_data *window = NULL;
569 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
572 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
575 /* Select window for current tx bit rate */
576 window = &(tbl->win[scale_index]);
578 /* Get expected throughput */
579 tpt = get_expected_tpt(tbl, scale_index);
582 * Keep track of only the latest 62 tx frame attempts in this rate's
583 * history window; anything older isn't really relevant any more.
584 * If we have filled up the sliding window, drop the oldest attempt;
585 * if the oldest attempt (highest bit in bitmap) shows "success",
586 * subtract "1" from the success counter (this is the main reason
587 * we keep these bitmaps!).
589 while (attempts > 0) {
590 if (window->counter >= IWL_RATE_MAX_WINDOW) {
591 /* remove earliest */
592 window->counter = IWL_RATE_MAX_WINDOW - 1;
594 if (window->data & mask) {
595 window->data &= ~mask;
596 window->success_counter--;
600 /* Increment frames-attempted counter */
603 /* Shift bitmap by one frame to throw away oldest history */
606 /* Mark the most recent #successes attempts as successful */
608 window->success_counter++;
616 /* Calculate current success ratio, avoid divide-by-0! */
617 if (window->counter > 0)
618 window->success_ratio = 128 * (100 * window->success_counter)
621 window->success_ratio = IWL_INVALID_VALUE;
623 fail_count = window->counter - window->success_counter;
625 /* Calculate average throughput, if we have enough history. */
626 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
627 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
628 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
630 window->average_tpt = IWL_INVALID_VALUE;
635 /* Convert rs_rate object into ucode rate bitmask */
636 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
637 struct rs_rate *rate)
640 int index = rate->index;
642 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
643 RATE_MCS_ANT_ABC_MSK);
645 if (is_legacy(rate)) {
646 ucode_rate |= iwl_rates[index].plcp;
647 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
648 ucode_rate |= RATE_MCS_CCK_MSK;
653 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
654 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
655 index = IWL_LAST_HT_RATE;
657 ucode_rate |= RATE_MCS_HT_MSK;
659 if (is_ht_siso(rate))
660 ucode_rate |= iwl_rates[index].plcp_ht_siso;
661 else if (is_ht_mimo2(rate))
662 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
665 } else if (is_vht(rate)) {
666 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
667 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
668 index = IWL_LAST_VHT_RATE;
670 ucode_rate |= RATE_MCS_VHT_MSK;
671 if (is_vht_siso(rate))
672 ucode_rate |= iwl_rates[index].plcp_vht_siso;
673 else if (is_vht_mimo2(rate))
674 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
679 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
682 ucode_rate |= rate->bw;
684 ucode_rate |= RATE_MCS_SGI_MSK;
689 /* Convert a ucode rate into an rs_rate object */
690 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
691 enum ieee80211_band band,
692 struct rs_rate *rate)
694 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
695 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
698 memset(rate, 0, sizeof(struct rs_rate));
699 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
701 if (rate->index == IWL_RATE_INVALID) {
706 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
709 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
710 !(ucode_rate & RATE_MCS_VHT_MSK)) {
711 if (num_of_ant == 1) {
712 if (band == IEEE80211_BAND_5GHZ)
713 rate->type = LQ_LEGACY_A;
715 rate->type = LQ_LEGACY_G;
722 if (ucode_rate & RATE_MCS_SGI_MSK)
725 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
727 if (ucode_rate & RATE_MCS_HT_MSK) {
728 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
729 RATE_HT_MCS_NSS_POS) + 1;
732 rate->type = LQ_HT_SISO;
733 WARN_ON_ONCE(num_of_ant != 1);
734 } else if (nss == 2) {
735 rate->type = LQ_HT_MIMO2;
736 WARN_ON_ONCE(num_of_ant != 2);
740 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
741 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
742 RATE_VHT_MCS_NSS_POS) + 1;
745 rate->type = LQ_VHT_SISO;
746 WARN_ON_ONCE(num_of_ant != 1);
747 } else if (nss == 2) {
748 rate->type = LQ_VHT_MIMO2;
749 WARN_ON_ONCE(num_of_ant != 2);
755 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
756 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
762 /* switch to another antenna/antennas and return 1 */
763 /* if no other valid antenna found, return 0 */
764 static int rs_toggle_antenna(u32 valid_ant, u32 *ucode_rate,
765 struct rs_rate *rate)
769 if (!rate->ant || rate->ant > ANT_ABC)
772 if (!rs_is_valid_ant(valid_ant, rate->ant))
775 new_ant_type = ant_toggle_lookup[rate->ant];
777 while ((new_ant_type != rate->ant) &&
778 !rs_is_valid_ant(valid_ant, new_ant_type))
779 new_ant_type = ant_toggle_lookup[new_ant_type];
781 if (new_ant_type == rate->ant)
784 rate->ant = new_ant_type;
786 /* TODO: get rid of ucode_rate here. This should handle only rs_rate */
787 *ucode_rate &= ~RATE_MCS_ANT_ABC_MSK;
788 *ucode_rate |= new_ant_type << RATE_MCS_ANT_POS;
792 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
793 struct rs_rate *rate)
796 return lq_sta->active_legacy_rate;
797 else if (is_siso(rate))
798 return lq_sta->active_siso_rate;
799 else if (is_mimo2(rate))
800 return lq_sta->active_mimo2_rate;
806 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
809 u8 high = IWL_RATE_INVALID;
810 u8 low = IWL_RATE_INVALID;
812 /* 802.11A or ht walks to the next literal adjacent rate in
814 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
818 /* Find the previous rate that is in the rate mask */
820 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
821 if (rate_mask & mask) {
827 /* Find the next rate that is in the rate mask */
829 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
830 if (rate_mask & mask) {
836 return (high << 8) | low;
840 while (low != IWL_RATE_INVALID) {
841 low = iwl_rates[low].prev_rs;
842 if (low == IWL_RATE_INVALID)
844 if (rate_mask & (1 << low))
846 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
850 while (high != IWL_RATE_INVALID) {
851 high = iwl_rates[high].next_rs;
852 if (high == IWL_RATE_INVALID)
854 if (rate_mask & (1 << high))
856 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
859 return (high << 8) | low;
862 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
863 struct rs_rate *rate,
864 u8 scale_index, u8 ht_possible)
869 u8 switch_to_legacy = 0;
870 struct iwl_mvm *mvm = lq_sta->drv;
872 /* check if we need to switch from HT to legacy rates.
873 * assumption is that mandatory rates (1Mbps or 6Mbps)
874 * are always supported (spec demand) */
875 if (!is_legacy(rate) && (!ht_possible || !scale_index)) {
876 switch_to_legacy = 1;
877 WARN_ON_ONCE(scale_index < IWL_RATE_MCS_0_INDEX &&
878 scale_index > IWL_RATE_MCS_9_INDEX);
879 scale_index = rs_ht_to_legacy[scale_index];
880 if (lq_sta->band == IEEE80211_BAND_5GHZ)
881 rate->type = LQ_LEGACY_A;
883 rate->type = LQ_LEGACY_G;
885 if (num_of_ant(rate->ant) > 1)
887 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
889 rate->bw = RATE_MCS_CHAN_WIDTH_20;
893 rate_mask = rs_get_supported_rates(lq_sta, rate);
895 /* Mask with station rate restriction */
896 if (is_legacy(rate)) {
897 /* supp_rates has no CCK bits in A mode */
898 if (lq_sta->band == IEEE80211_BAND_5GHZ)
899 rate_mask = (u16)(rate_mask &
900 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
902 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
905 /* If we switched from HT to legacy, check current rate */
906 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
911 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
913 low = high_low & 0xff;
915 if (low == IWL_RATE_INVALID)
920 return ucode_rate_from_rs_rate(lq_sta->drv, rate);
923 /* Simple function to compare two rate scale table types */
924 static inline bool rs_rate_match(struct rs_rate *a,
927 return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
930 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
932 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
933 return RATE_MCS_CHAN_WIDTH_40;
934 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
935 return RATE_MCS_CHAN_WIDTH_80;
936 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
937 return RATE_MCS_CHAN_WIDTH_160;
939 return RATE_MCS_CHAN_WIDTH_20;
943 * mac80211 sends us Tx status
945 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
946 struct ieee80211_sta *sta, void *priv_sta,
952 struct iwl_lq_sta *lq_sta = priv_sta;
953 struct iwl_lq_cmd *table;
954 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
955 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
956 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
957 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
958 enum mac80211_rate_control_flags mac_flags;
961 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
963 /* Treat uninitialized rate scaling data same as non-existing. */
965 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
967 } else if (!lq_sta->drv) {
968 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
972 if (!ieee80211_is_data(hdr->frame_control) ||
973 info->flags & IEEE80211_TX_CTL_NO_ACK)
976 /* This packet was aggregated but doesn't carry status info */
977 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
978 !(info->flags & IEEE80211_TX_STAT_AMPDU))
982 * Ignore this Tx frame response if its initial rate doesn't match
983 * that of latest Link Quality command. There may be stragglers
984 * from a previous Link Quality command, but we're no longer interested
985 * in those; they're either from the "active" mode while we're trying
986 * to check "search" mode, or a prior "search" mode after we've moved
987 * to a new "search" mode (which might become the new "active" mode).
990 ucode_rate = le32_to_cpu(table->rs_table[0]);
991 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
992 if (info->band == IEEE80211_BAND_5GHZ)
993 rate.index -= IWL_FIRST_OFDM_RATE;
994 mac_flags = info->status.rates[0].flags;
995 mac_index = info->status.rates[0].idx;
996 /* For HT packets, map MCS to PLCP */
997 if (mac_flags & IEEE80211_TX_RC_MCS) {
998 /* Remove # of streams */
999 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1000 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1003 * mac80211 HT index is always zero-indexed; we need to move
1004 * HT OFDM rates after CCK rates in 2.4 GHz band
1006 if (info->band == IEEE80211_BAND_2GHZ)
1007 mac_index += IWL_FIRST_OFDM_RATE;
1008 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1009 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1010 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1014 /* Here we actually compare this rate to the latest LQ command */
1015 if ((mac_index < 0) ||
1016 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1017 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1018 (rate.ant != info->status.antenna) ||
1019 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1020 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1021 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1022 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1023 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1024 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1025 (rate.index != mac_index)) {
1027 "initial rate %d does not match %d (0x%x)\n",
1028 mac_index, rate.index, ucode_rate);
1030 * Since rates mis-match, the last LQ command may have failed.
1031 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1034 lq_sta->missed_rate_counter++;
1035 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1036 lq_sta->missed_rate_counter = 0;
1038 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1040 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1042 /* Regardless, ignore this status info for outdated rate */
1045 /* Rate did match, so reset the missed_rate_counter */
1046 lq_sta->missed_rate_counter = 0;
1048 /* Figure out if rate scale algorithm is in active or search table */
1049 if (rs_rate_match(&rate,
1050 &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1051 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1052 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1053 } else if (rs_rate_match(&rate,
1054 &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1055 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1056 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1059 "Neither active nor search matches tx rate\n");
1060 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1061 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1062 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1063 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1064 rs_dump_rate(mvm, &rate, "ACTUAL");
1067 * no matching table found, let's by-pass the data collection
1068 * and continue to perform rate scale to find the rate table
1070 rs_stay_in_table(lq_sta, true);
1075 * Updating the frame history depends on whether packets were
1078 * For aggregation, all packets were transmitted at the same rate, the
1079 * first index into rate scale table.
1081 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1082 ucode_rate = le32_to_cpu(table->rs_table[0]);
1083 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1084 rs_collect_tx_data(curr_tbl, rate.index,
1085 info->status.ampdu_len,
1086 info->status.ampdu_ack_len);
1088 /* Update success/fail counts if not searching for new mode */
1089 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1090 lq_sta->total_success += info->status.ampdu_ack_len;
1091 lq_sta->total_failed += (info->status.ampdu_len -
1092 info->status.ampdu_ack_len);
1096 * For legacy, update frame history with for each Tx retry.
1098 retries = info->status.rates[0].count - 1;
1099 /* HW doesn't send more than 15 retries */
1100 retries = min(retries, 15);
1102 /* The last transmission may have been successful */
1103 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1104 /* Collect data for each rate used during failed TX attempts */
1105 for (i = 0; i <= retries; ++i) {
1106 ucode_rate = le32_to_cpu(table->rs_table[i]);
1107 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1109 * Only collect stats if retried rate is in the same RS
1110 * table as active/search.
1112 if (rs_rate_match(&rate, &curr_tbl->rate))
1114 else if (rs_rate_match(&rate, &other_tbl->rate))
1115 tmp_tbl = other_tbl;
1118 "Tx packet rate doesn't match ACTIVE or SEARCH tables\n");
1119 rs_dump_rate(mvm, &rate, "Tx PACKET:");
1120 rs_dump_rate(mvm, &curr_tbl->rate, "CURRENT:");
1121 rs_dump_rate(mvm, &other_tbl->rate, "OTHER:");
1124 rs_collect_tx_data(tmp_tbl, rate.index, 1,
1125 i < retries ? 0 : legacy_success);
1128 /* Update success/fail counts if not searching for new mode */
1129 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1130 lq_sta->total_success += legacy_success;
1131 lq_sta->total_failed += retries + (1 - legacy_success);
1134 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1135 lq_sta->last_rate_n_flags = ucode_rate;
1137 /* See if there's a better rate or modulation mode to try. */
1138 if (sta && sta->supp_rates[sband->band])
1139 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1143 * Begin a period of staying with a selected modulation mode.
1144 * Set "stay_in_tbl" flag to prevent any mode switches.
1145 * Set frame tx success limits according to legacy vs. high-throughput,
1146 * and reset overall (spanning all rates) tx success history statistics.
1147 * These control how long we stay using same modulation mode before
1148 * searching for a new mode.
1150 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1151 struct iwl_lq_sta *lq_sta)
1153 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1154 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1156 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1157 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1158 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1160 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1161 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1162 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1164 lq_sta->table_count = 0;
1165 lq_sta->total_failed = 0;
1166 lq_sta->total_success = 0;
1167 lq_sta->flush_timer = jiffies;
1168 lq_sta->visited_columns = 0;
1171 static s32 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1172 const struct rs_tx_column *column,
1175 /* Used to choose among HT tables */
1176 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1178 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1179 column->mode != RS_SISO &&
1180 column->mode != RS_MIMO2))
1181 return expected_tpt_legacy;
1183 /* Legacy rates have only one table */
1184 if (column->mode == RS_LEGACY)
1185 return expected_tpt_legacy;
1187 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1188 /* Choose among many HT tables depending on number of streams
1189 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1191 if (column->mode == RS_SISO) {
1193 case RATE_MCS_CHAN_WIDTH_20:
1194 ht_tbl_pointer = expected_tpt_siso_20MHz;
1196 case RATE_MCS_CHAN_WIDTH_40:
1197 ht_tbl_pointer = expected_tpt_siso_40MHz;
1199 case RATE_MCS_CHAN_WIDTH_80:
1200 ht_tbl_pointer = expected_tpt_siso_80MHz;
1205 } else if (column->mode == RS_MIMO2) {
1207 case RATE_MCS_CHAN_WIDTH_20:
1208 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1210 case RATE_MCS_CHAN_WIDTH_40:
1211 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1213 case RATE_MCS_CHAN_WIDTH_80:
1214 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1223 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1224 return ht_tbl_pointer[0];
1225 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1226 return ht_tbl_pointer[1];
1227 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1228 return ht_tbl_pointer[2];
1230 return ht_tbl_pointer[3];
1233 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1234 struct iwl_scale_tbl_info *tbl)
1236 struct rs_rate *rate = &tbl->rate;
1237 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1239 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1243 * Find starting rate for new "search" high-throughput mode of modulation.
1244 * Goal is to find lowest expected rate (under perfect conditions) that is
1245 * above the current measured throughput of "active" mode, to give new mode
1246 * a fair chance to prove itself without too many challenges.
1248 * This gets called when transitioning to more aggressive modulation
1249 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1250 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1251 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1252 * bit rate will typically need to increase, but not if performance was bad.
1254 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1255 struct iwl_lq_sta *lq_sta,
1256 struct iwl_scale_tbl_info *tbl, /* "search" */
1257 u16 rate_mask, s8 index)
1259 /* "active" values */
1260 struct iwl_scale_tbl_info *active_tbl =
1261 &(lq_sta->lq_info[lq_sta->active_tbl]);
1262 s32 active_sr = active_tbl->win[index].success_ratio;
1263 s32 active_tpt = active_tbl->expected_tpt[index];
1265 /* expected "search" throughput */
1266 s32 *tpt_tbl = tbl->expected_tpt;
1268 s32 new_rate, high, low, start_hi;
1272 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1275 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1278 low = high_low & 0xff;
1279 high = (high_low >> 8) & 0xff;
1282 * Lower the "search" bit rate, to give new "search" mode
1283 * approximately the same throughput as "active" if:
1285 * 1) "Active" mode has been working modestly well (but not
1286 * great), and expected "search" throughput (under perfect
1287 * conditions) at candidate rate is above the actual
1288 * measured "active" throughput (but less than expected
1289 * "active" throughput under perfect conditions).
1291 * 2) "Active" mode has been working perfectly or very well
1292 * and expected "search" throughput (under perfect
1293 * conditions) at candidate rate is above expected
1294 * "active" throughput (under perfect conditions).
1296 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1297 ((active_sr > RS_SR_FORCE_DECREASE) &&
1298 (active_sr <= IWL_RATE_HIGH_TH) &&
1299 (tpt_tbl[rate] <= active_tpt))) ||
1300 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1301 (tpt_tbl[rate] > active_tpt))) {
1302 /* (2nd or later pass)
1303 * If we've already tried to raise the rate, and are
1304 * now trying to lower it, use the higher rate. */
1305 if (start_hi != IWL_RATE_INVALID) {
1306 new_rate = start_hi;
1312 /* Loop again with lower rate */
1313 if (low != IWL_RATE_INVALID)
1316 /* Lower rate not available, use the original */
1320 /* Else try to raise the "search" rate to match "active" */
1322 /* (2nd or later pass)
1323 * If we've already tried to lower the rate, and are
1324 * now trying to raise it, use the lower rate. */
1325 if (new_rate != IWL_RATE_INVALID)
1328 /* Loop again with higher rate */
1329 else if (high != IWL_RATE_INVALID) {
1333 /* Higher rate not available, use the original */
1344 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1346 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1347 return RATE_MCS_CHAN_WIDTH_80;
1348 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1349 return RATE_MCS_CHAN_WIDTH_40;
1351 return RATE_MCS_CHAN_WIDTH_20;
1355 * Check whether we should continue using same modulation mode, or
1356 * begin search for a new mode, based on:
1357 * 1) # tx successes or failures while using this mode
1358 * 2) # times calling this function
1359 * 3) elapsed time in this mode (not used, for now)
1361 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1363 struct iwl_scale_tbl_info *tbl;
1366 int flush_interval_passed = 0;
1367 struct iwl_mvm *mvm;
1370 active_tbl = lq_sta->active_tbl;
1372 tbl = &(lq_sta->lq_info[active_tbl]);
1374 /* If we've been disallowing search, see if we should now allow it */
1375 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1376 /* Elapsed time using current modulation mode */
1377 if (lq_sta->flush_timer)
1378 flush_interval_passed =
1380 (unsigned long)(lq_sta->flush_timer +
1381 RS_STAY_IN_COLUMN_TIMEOUT));
1384 * Check if we should allow search for new modulation mode.
1385 * If many frames have failed or succeeded, or we've used
1386 * this same modulation for a long time, allow search, and
1387 * reset history stats that keep track of whether we should
1388 * allow a new search. Also (below) reset all bitmaps and
1389 * stats in active history.
1392 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1393 (lq_sta->total_success > lq_sta->max_success_limit) ||
1394 ((!lq_sta->search_better_tbl) &&
1395 (lq_sta->flush_timer) && (flush_interval_passed))) {
1397 "LQ: stay is expired %d %d %d\n",
1398 lq_sta->total_failed,
1399 lq_sta->total_success,
1400 flush_interval_passed);
1402 /* Allow search for new mode */
1403 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1405 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1406 lq_sta->total_failed = 0;
1407 lq_sta->total_success = 0;
1408 lq_sta->flush_timer = 0;
1409 /* mark the current column as visited */
1410 lq_sta->visited_columns = BIT(tbl->column);
1412 * Else if we've used this modulation mode enough repetitions
1413 * (regardless of elapsed time or success/failure), reset
1414 * history bitmaps and rate-specific stats for all rates in
1418 lq_sta->table_count++;
1419 if (lq_sta->table_count >=
1420 lq_sta->table_count_limit) {
1421 lq_sta->table_count = 0;
1424 "LQ: stay in table clear win\n");
1425 for (i = 0; i < IWL_RATE_COUNT; i++)
1426 rs_rate_scale_clear_window(
1431 /* If transitioning to allow "search", reset all history
1432 * bitmaps and stats in active table (this will become the new
1433 * "search" table). */
1434 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1435 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
1436 for (i = 0; i < IWL_RATE_COUNT; i++)
1437 rs_rate_scale_clear_window(&(tbl->win[i]));
1443 * setup rate table in uCode
1445 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1446 struct ieee80211_sta *sta,
1447 struct iwl_lq_sta *lq_sta,
1448 struct rs_rate *rate)
1452 ucode_rate = ucode_rate_from_rs_rate(mvm, rate);
1453 rs_fill_link_cmd(mvm, sta, lq_sta, ucode_rate);
1454 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1457 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1458 struct ieee80211_hdr *hdr)
1460 u8 tid = IWL_MAX_TID_COUNT;
1462 if (ieee80211_is_data_qos(hdr->frame_control)) {
1463 u8 *qc = ieee80211_get_qos_ctl(hdr);
1467 if (unlikely(tid > IWL_MAX_TID_COUNT))
1468 tid = IWL_MAX_TID_COUNT;
1473 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1474 struct iwl_lq_sta *lq_sta,
1475 struct ieee80211_sta *sta,
1476 struct iwl_scale_tbl_info *tbl)
1479 enum rs_column next_col_id;
1480 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1481 const struct rs_tx_column *next_col;
1482 allow_column_func_t allow_func;
1483 u8 valid_ants = iwl_fw_valid_tx_ant(mvm->fw);
1484 s32 *expected_tpt_tbl;
1485 s32 tpt, max_expected_tpt;
1487 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1488 next_col_id = curr_col->next_columns[i];
1490 if (next_col_id == RS_COLUMN_INVALID)
1493 if (lq_sta->visited_columns & BIT(next_col_id)) {
1494 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1499 next_col = &rs_tx_columns[next_col_id];
1501 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1503 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1504 next_col_id, valid_ants, next_col->ant);
1508 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1509 allow_func = next_col->checks[j];
1510 if (allow_func && !allow_func(mvm, sta, tbl))
1514 if (j != MAX_COLUMN_CHECKS) {
1516 "Skip column %d: not allowed (check %d failed)\n",
1522 tpt = lq_sta->last_tpt / 100;
1523 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1525 if (WARN_ON_ONCE(!expected_tpt_tbl))
1528 max_expected_tpt = 0;
1529 for (n = 0; n < IWL_RATE_COUNT; n++)
1530 if (expected_tpt_tbl[n] > max_expected_tpt)
1531 max_expected_tpt = expected_tpt_tbl[n];
1533 if (tpt >= max_expected_tpt) {
1535 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1536 next_col_id, max_expected_tpt, tpt);
1543 if (i == MAX_NEXT_COLUMNS)
1544 return RS_COLUMN_INVALID;
1546 IWL_DEBUG_RATE(mvm, "Found potential column %d\n", next_col_id);
1551 static int rs_switch_to_column(struct iwl_mvm *mvm,
1552 struct iwl_lq_sta *lq_sta,
1553 struct ieee80211_sta *sta,
1554 enum rs_column col_id)
1556 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1557 struct iwl_scale_tbl_info *search_tbl =
1558 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1559 struct rs_rate *rate = &search_tbl->rate;
1560 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1561 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1562 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1563 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1567 memcpy(search_tbl, tbl, sz);
1569 rate->sgi = column->sgi;
1570 rate->ant = column->ant;
1572 if (column->mode == RS_LEGACY) {
1573 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1574 rate->type = LQ_LEGACY_A;
1576 rate->type = LQ_LEGACY_G;
1578 rate_mask = lq_sta->active_legacy_rate;
1579 } else if (column->mode == RS_SISO) {
1580 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1581 rate_mask = lq_sta->active_siso_rate;
1582 } else if (column->mode == RS_MIMO2) {
1583 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1584 rate_mask = lq_sta->active_mimo2_rate;
1586 WARN_ON_ONCE("Bad column mode");
1589 rate->bw = rs_bw_from_sta_bw(sta);
1590 search_tbl->column = col_id;
1591 rs_set_expected_tpt_table(lq_sta, search_tbl);
1593 /* Get the best matching rate if we're changing modes. e.g.
1594 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1596 if (curr_column->mode != column->mode) {
1597 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1598 rate_mask, rate->index);
1600 if ((rate_idx == IWL_RATE_INVALID) ||
1601 !(BIT(rate_idx) & rate_mask)) {
1603 "can not switch with index %d"
1605 rate_idx, rate_mask);
1610 rate->index = rate_idx;
1613 /* TODO: remove current_rate and keep using rs_rate all the way until
1614 * we need to fill in the rs_table in the LQ command
1616 search_tbl->current_rate = ucode_rate_from_rs_rate(mvm, rate);
1617 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1618 col_id, rate->index);
1620 lq_sta->visited_columns |= BIT(col_id);
1624 rate->type = LQ_NONE;
1630 * Do rate scaling and search for new modulation mode.
1632 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1633 struct sk_buff *skb,
1634 struct ieee80211_sta *sta,
1635 struct iwl_lq_sta *lq_sta)
1637 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1638 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1639 int low = IWL_RATE_INVALID;
1640 int high = IWL_RATE_INVALID;
1643 struct iwl_rate_scale_data *window = NULL;
1644 int current_tpt = IWL_INVALID_VALUE;
1645 int low_tpt = IWL_INVALID_VALUE;
1646 int high_tpt = IWL_INVALID_VALUE;
1648 s8 scale_action = 0;
1651 struct iwl_scale_tbl_info *tbl, *tbl1;
1652 u16 rate_scale_index_msk = 0;
1657 u8 tid = IWL_MAX_TID_COUNT;
1658 u8 prev_agg = lq_sta->is_agg;
1659 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1660 struct iwl_mvm_tid_data *tid_data;
1661 struct rs_rate *rate;
1663 /* Send management frames and NO_ACK data using lowest rate. */
1664 /* TODO: this could probably be improved.. */
1665 if (!ieee80211_is_data(hdr->frame_control) ||
1666 info->flags & IEEE80211_TX_CTL_NO_ACK)
1669 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1671 tid = rs_get_tid(lq_sta, hdr);
1672 if ((tid != IWL_MAX_TID_COUNT) &&
1673 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1674 tid_data = &sta_priv->tid_data[tid];
1675 if (tid_data->state == IWL_AGG_OFF)
1684 * Select rate-scale / modulation-mode table to work with in
1685 * the rest of this function: "search" if searching for better
1686 * modulation mode, or "active" if doing rate scaling within a mode.
1688 if (!lq_sta->search_better_tbl)
1689 active_tbl = lq_sta->active_tbl;
1691 active_tbl = 1 - lq_sta->active_tbl;
1693 tbl = &(lq_sta->lq_info[active_tbl]);
1696 if (prev_agg != lq_sta->is_agg) {
1698 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
1699 prev_agg, lq_sta->is_agg);
1700 rs_set_expected_tpt_table(lq_sta, tbl);
1703 /* current tx rate */
1704 index = lq_sta->last_txrate_idx;
1706 /* rates available for this association, and for modulation mode */
1707 rate_mask = rs_get_supported_rates(lq_sta, rate);
1709 /* mask with station rate restriction */
1710 if (is_legacy(rate)) {
1711 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1712 /* supp_rates has no CCK bits in A mode */
1713 rate_scale_index_msk = (u16) (rate_mask &
1714 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1716 rate_scale_index_msk = (u16) (rate_mask &
1717 lq_sta->supp_rates);
1720 rate_scale_index_msk = rate_mask;
1723 if (!rate_scale_index_msk)
1724 rate_scale_index_msk = rate_mask;
1726 if (!((BIT(index) & rate_scale_index_msk))) {
1727 IWL_ERR(mvm, "Current Rate is not valid\n");
1728 if (lq_sta->search_better_tbl) {
1729 /* revert to active table if search table is not valid*/
1730 rate->type = LQ_NONE;
1731 lq_sta->search_better_tbl = 0;
1732 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1733 /* get "active" rate info */
1734 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1735 tbl->rate.index = index;
1736 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
1741 /* Get expected throughput table and history window for current rate */
1742 if (!tbl->expected_tpt) {
1743 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1747 /* force user max rate if set by user */
1748 if ((lq_sta->max_rate_idx != -1) &&
1749 (lq_sta->max_rate_idx < index)) {
1750 index = lq_sta->max_rate_idx;
1752 window = &(tbl->win[index]);
1754 "Forcing user max rate %d\n",
1759 window = &(tbl->win[index]);
1762 * If there is not enough history to calculate actual average
1763 * throughput, keep analyzing results of more tx frames, without
1764 * changing rate or mode (bypass most of the rest of this function).
1765 * Set up new rate table in uCode only if old rate is not supported
1766 * in current association (use new rate found above).
1768 fail_count = window->counter - window->success_counter;
1769 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1770 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1772 "(%s: %d): Test Window: succ %d total %d\n",
1773 rs_pretty_lq_type(rate->type),
1774 index, window->success_counter, window->counter);
1776 /* Can't calculate this yet; not enough history */
1777 window->average_tpt = IWL_INVALID_VALUE;
1779 /* Should we stay with this modulation mode,
1780 * or search for a new one? */
1781 rs_stay_in_table(lq_sta, false);
1785 /* Else we have enough samples; calculate estimate of
1786 * actual average throughput */
1787 if (window->average_tpt != ((window->success_ratio *
1788 tbl->expected_tpt[index] + 64) / 128)) {
1789 window->average_tpt = ((window->success_ratio *
1790 tbl->expected_tpt[index] + 64) / 128);
1793 /* If we are searching for better modulation mode, check success. */
1794 if (lq_sta->search_better_tbl) {
1795 /* If good success, continue using the "search" mode;
1796 * no need to send new link quality command, since we're
1797 * continuing to use the setup that we've been trying. */
1798 if (window->average_tpt > lq_sta->last_tpt) {
1800 "SWITCHING TO NEW TABLE SR: %d "
1801 "cur-tpt %d old-tpt %d\n",
1802 window->success_ratio,
1803 window->average_tpt,
1806 /* Swap tables; "search" becomes "active" */
1807 lq_sta->active_tbl = active_tbl;
1808 current_tpt = window->average_tpt;
1809 /* Else poor success; go back to mode in "active" table */
1812 "GOING BACK TO THE OLD TABLE: SR %d "
1813 "cur-tpt %d old-tpt %d\n",
1814 window->success_ratio,
1815 window->average_tpt,
1818 /* Nullify "search" table */
1819 rate->type = LQ_NONE;
1821 /* Revert to "active" table */
1822 active_tbl = lq_sta->active_tbl;
1823 tbl = &(lq_sta->lq_info[active_tbl]);
1825 /* Revert to "active" rate and throughput info */
1826 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1827 current_tpt = lq_sta->last_tpt;
1829 /* Need to set up a new rate table in uCode */
1833 /* Either way, we've made a decision; modulation mode
1834 * search is done, allow rate adjustment next time. */
1835 lq_sta->search_better_tbl = 0;
1836 done_search = 1; /* Don't switch modes below! */
1840 /* (Else) not in search of better modulation mode, try for better
1841 * starting rate, while staying in this mode. */
1842 high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
1844 low = high_low & 0xff;
1845 high = (high_low >> 8) & 0xff;
1847 /* If user set max rate, dont allow higher than user constrain */
1848 if ((lq_sta->max_rate_idx != -1) &&
1849 (lq_sta->max_rate_idx < high))
1850 high = IWL_RATE_INVALID;
1852 sr = window->success_ratio;
1854 /* Collect measured throughputs for current and adjacent rates */
1855 current_tpt = window->average_tpt;
1856 if (low != IWL_RATE_INVALID)
1857 low_tpt = tbl->win[low].average_tpt;
1858 if (high != IWL_RATE_INVALID)
1859 high_tpt = tbl->win[high].average_tpt;
1862 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
1863 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
1864 low, high, low_tpt, high_tpt);
1868 /* Too many failures, decrease rate */
1869 if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1871 "decrease rate because of low SR\n");
1873 /* No throughput measured yet for adjacent rates; try increase. */
1874 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1875 (high_tpt == IWL_INVALID_VALUE)) {
1876 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) {
1878 "Good SR and no high rate measurement. "
1881 } else if (low != IWL_RATE_INVALID) {
1883 "Remain in current rate\n");
1888 /* Both adjacent throughputs are measured, but neither one has better
1889 * throughput; we're using the best rate, don't change it! */
1890 else if ((low_tpt != IWL_INVALID_VALUE) &&
1891 (high_tpt != IWL_INVALID_VALUE) &&
1892 (low_tpt < current_tpt) &&
1893 (high_tpt < current_tpt)) {
1895 "Both high and low are worse. "
1900 /* At least one adjacent rate's throughput is measured,
1901 * and may have better performance. */
1903 /* Higher adjacent rate's throughput is measured */
1904 if (high_tpt != IWL_INVALID_VALUE) {
1905 /* Higher rate has better throughput */
1906 if (high_tpt > current_tpt &&
1907 sr >= IWL_RATE_INCREASE_TH) {
1909 "Higher rate is better and good "
1910 "SR. Increate rate\n");
1914 "Higher rate isn't better OR "
1915 "no good SR. Maintain rate\n");
1919 /* Lower adjacent rate's throughput is measured */
1920 } else if (low_tpt != IWL_INVALID_VALUE) {
1921 /* Lower rate has better throughput */
1922 if (low_tpt > current_tpt) {
1924 "Lower rate is better. "
1927 } else if (sr >= IWL_RATE_INCREASE_TH) {
1929 "Lower rate isn't better and "
1930 "good SR. Increase rate\n");
1936 /* Sanity check; asked for decrease, but success rate or throughput
1937 * has been good at old rate. Don't change it. */
1938 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1939 ((sr > IWL_RATE_HIGH_TH) ||
1940 (current_tpt > (100 * tbl->expected_tpt[low])))) {
1942 "Sanity check failed. Maintain rate\n");
1946 /* Force a search in case BT doesn't like us being in MIMO */
1947 if (is_mimo(rate) &&
1948 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
1950 "BT Coex forbids MIMO. Search for new config\n");
1951 rs_stay_in_table(lq_sta, true);
1955 switch (scale_action) {
1957 /* Decrease starting rate, update uCode's rate table */
1958 if (low != IWL_RATE_INVALID) {
1963 "At the bottom rate. Can't decrease\n");
1968 /* Increase starting rate, update uCode's rate table */
1969 if (high != IWL_RATE_INVALID) {
1974 "At the top rate. Can't increase\n");
1985 /* Replace uCode's rate table for the destination station. */
1987 tbl->rate.index = index;
1988 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
1991 rs_stay_in_table(lq_sta, false);
1994 * Search for new modulation mode if we're:
1995 * 1) Not changing rates right now
1996 * 2) Not just finishing up a search
1997 * 3) Allowing a new search
1999 if (!update_lq && !done_search &&
2000 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2001 && window->counter) {
2002 enum rs_column next_column;
2004 /* Save current throughput to compare with "search" throughput*/
2005 lq_sta->last_tpt = current_tpt;
2008 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2009 update_lq, done_search, lq_sta->rs_state,
2012 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2013 if (next_column != RS_COLUMN_INVALID) {
2014 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2017 lq_sta->search_better_tbl = 1;
2020 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2021 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2024 /* If new "search" mode was selected, set up in uCode table */
2025 if (lq_sta->search_better_tbl) {
2026 /* Access the "search" table, clear its history. */
2027 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2028 for (i = 0; i < IWL_RATE_COUNT; i++)
2029 rs_rate_scale_clear_window(&(tbl->win[i]));
2031 /* Use new "search" start rate */
2032 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2034 rs_dump_rate(mvm, &tbl->rate,
2035 "Switch to SEARCH TABLE:");
2036 rs_fill_link_cmd(mvm, sta, lq_sta, tbl->current_rate);
2037 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2043 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2044 /* If the "active" (non-search) mode was legacy,
2045 * and we've tried switching antennas,
2046 * but we haven't been able to try HT modes (not available),
2047 * stay with best antenna legacy modulation for a while
2048 * before next round of mode comparisons. */
2049 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2050 if (is_legacy(&tbl1->rate) && !sta->ht_cap.ht_supported) {
2051 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2052 rs_set_stay_in_table(mvm, 1, lq_sta);
2054 /* If we're in an HT mode, and all 3 mode switch actions
2055 * have been tried and compared, stay in this best modulation
2056 * mode for a while before next round of mode comparisons. */
2057 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2058 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2059 (tid != IWL_MAX_TID_COUNT)) {
2060 tid_data = &sta_priv->tid_data[tid];
2061 if (tid_data->state == IWL_AGG_OFF) {
2063 "try to aggregate tid %d\n",
2065 rs_tl_turn_on_agg(mvm, tid,
2069 rs_set_stay_in_table(mvm, 0, lq_sta);
2074 tbl->rate.index = index;
2075 tbl->current_rate = ucode_rate_from_rs_rate(mvm, &tbl->rate);
2076 lq_sta->last_txrate_idx = index;
2080 * rs_initialize_lq - Initialize a station's hardware rate table
2082 * The uCode's station table contains a table of fallback rates
2083 * for automatic fallback during transmission.
2085 * NOTE: This sets up a default set of values. These will be replaced later
2086 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2089 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2090 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2091 * which requires station table entry to exist).
2093 static void rs_initialize_lq(struct iwl_mvm *mvm,
2094 struct ieee80211_sta *sta,
2095 struct iwl_lq_sta *lq_sta,
2096 enum ieee80211_band band,
2099 struct iwl_scale_tbl_info *tbl;
2100 struct rs_rate *rate;
2106 if (!sta || !lq_sta)
2109 i = lq_sta->last_txrate_idx;
2111 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2113 if (!lq_sta->search_better_tbl)
2114 active_tbl = lq_sta->active_tbl;
2116 active_tbl = 1 - lq_sta->active_tbl;
2118 tbl = &(lq_sta->lq_info[active_tbl]);
2121 if ((i < 0) || (i >= IWL_RATE_COUNT))
2125 rate->ant = first_antenna(valid_tx_ant);
2127 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2128 if (band == IEEE80211_BAND_5GHZ)
2129 rate->type = LQ_LEGACY_A;
2131 rate->type = LQ_LEGACY_G;
2133 ucode_rate = ucode_rate_from_rs_rate(mvm, rate);
2134 tbl->current_rate = ucode_rate;
2136 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2137 if (rate->ant == ANT_A)
2138 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2140 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2142 rs_set_expected_tpt_table(lq_sta, tbl);
2143 rs_fill_link_cmd(NULL, NULL, lq_sta, ucode_rate);
2144 /* TODO restore station should remember the lq cmd */
2145 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2148 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2149 struct ieee80211_tx_rate_control *txrc)
2151 struct sk_buff *skb = txrc->skb;
2152 struct ieee80211_supported_band *sband = txrc->sband;
2153 struct iwl_op_mode *op_mode __maybe_unused =
2154 (struct iwl_op_mode *)mvm_r;
2155 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2156 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2157 struct iwl_lq_sta *lq_sta = mvm_sta;
2159 /* Get max rate if user set max rate */
2161 lq_sta->max_rate_idx = txrc->max_rate_idx;
2162 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2163 (lq_sta->max_rate_idx != -1))
2164 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2165 if ((lq_sta->max_rate_idx < 0) ||
2166 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2167 lq_sta->max_rate_idx = -1;
2170 /* Treat uninitialized rate scaling data same as non-existing. */
2171 if (lq_sta && !lq_sta->drv) {
2172 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2176 /* Send management frames and NO_ACK data using lowest rate. */
2177 if (rate_control_send_low(sta, mvm_sta, txrc))
2180 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2181 info->band, &info->control.rates[0]);
2183 info->control.rates[0].count = 1;
2186 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2189 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2190 struct iwl_op_mode *op_mode __maybe_unused =
2191 (struct iwl_op_mode *)mvm_rate;
2192 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2194 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2196 return &sta_priv->lq_sta;
2199 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2202 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2203 (0x3 << (2 * (nss - 1)));
2204 rx_mcs >>= (2 * (nss - 1));
2206 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2207 return IWL_RATE_MCS_7_INDEX;
2208 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2209 return IWL_RATE_MCS_8_INDEX;
2210 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2211 return IWL_RATE_MCS_9_INDEX;
2213 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2217 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2218 struct ieee80211_sta_vht_cap *vht_cap,
2219 struct iwl_lq_sta *lq_sta)
2222 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2224 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2225 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2226 if (i == IWL_RATE_9M_INDEX)
2229 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2230 if (i == IWL_RATE_MCS_9_INDEX &&
2231 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2234 lq_sta->active_siso_rate |= BIT(i);
2238 if (sta->rx_nss < 2)
2241 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2242 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2243 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2244 if (i == IWL_RATE_9M_INDEX)
2247 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2248 if (i == IWL_RATE_MCS_9_INDEX &&
2249 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2252 lq_sta->active_mimo2_rate |= BIT(i);
2258 * Called after adding a new station to initialize rate scaling
2260 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2261 enum ieee80211_band band, bool init)
2264 struct ieee80211_hw *hw = mvm->hw;
2265 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2266 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2267 struct iwl_mvm_sta *sta_priv;
2268 struct iwl_lq_sta *lq_sta;
2269 struct ieee80211_supported_band *sband;
2270 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2272 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2273 lq_sta = &sta_priv->lq_sta;
2274 memset(lq_sta, 0, sizeof(*lq_sta));
2276 sband = hw->wiphy->bands[band];
2278 lq_sta->lq.sta_id = sta_priv->sta_id;
2280 for (j = 0; j < LQ_SIZE; j++)
2281 for (i = 0; i < IWL_RATE_COUNT; i++)
2282 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2284 lq_sta->flush_timer = 0;
2285 lq_sta->supp_rates = sta->supp_rates[sband->band];
2288 "LQ: *** rate scale station global init for station %d ***\n",
2290 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2291 * the lowest or the highest rate.. Could consider using RSSI from
2292 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2295 lq_sta->max_rate_idx = -1;
2296 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2297 lq_sta->band = sband->band;
2299 * active legacy rates as per supported rates bitmap
2301 supp = sta->supp_rates[sband->band];
2302 lq_sta->active_legacy_rate = 0;
2303 for_each_set_bit(i, &supp, BITS_PER_LONG)
2304 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2306 /* TODO: should probably account for rx_highest for both HT/VHT */
2307 if (!vht_cap || !vht_cap->vht_supported) {
2308 /* active_siso_rate mask includes 9 MBits (bit 5),
2309 * and CCK (bits 0-3), supp_rates[] does not;
2310 * shift to convert format, force 9 MBits off.
2312 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2313 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2314 lq_sta->active_siso_rate &= ~((u16)0x2);
2315 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2318 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2319 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2320 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2321 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2323 lq_sta->is_vht = false;
2325 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2326 lq_sta->is_vht = true;
2330 "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
2331 lq_sta->active_siso_rate,
2332 lq_sta->active_mimo2_rate,
2335 /* These values will be overridden later */
2336 lq_sta->lq.single_stream_ant_msk =
2337 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2338 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2340 /* as default allow aggregation for all tids */
2341 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2344 /* Set last_txrate_idx to lowest rate */
2345 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2346 if (sband->band == IEEE80211_BAND_5GHZ)
2347 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2349 #ifdef CONFIG_MAC80211_DEBUGFS
2350 lq_sta->dbg_fixed_rate = 0;
2353 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2356 static void rs_rate_update(void *mvm_r,
2357 struct ieee80211_supported_band *sband,
2358 struct cfg80211_chan_def *chandef,
2359 struct ieee80211_sta *sta, void *priv_sta,
2363 struct iwl_op_mode *op_mode =
2364 (struct iwl_op_mode *)mvm_r;
2365 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2367 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2368 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2369 ieee80211_stop_tx_ba_session(sta, tid);
2371 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2374 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2375 struct ieee80211_sta *sta,
2376 struct iwl_lq_sta *lq_sta, u32 new_rate)
2378 struct rs_rate rate;
2380 int repeat_rate = 0;
2381 u8 ant_toggle_cnt = 0;
2382 u8 use_ht_possible = 1;
2383 u8 valid_tx_ant = 0;
2384 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2386 /* Override starting rate (index 0) if needed for debug purposes */
2387 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2389 rs_rate_from_ucode_rate(new_rate, lq_sta->band, &rate);
2391 /* How many times should we repeat the initial rate? */
2392 if (is_legacy(&rate)) {
2394 repeat_rate = IWL_NUMBER_TRY;
2396 repeat_rate = min(IWL_HT_NUMBER_TRY,
2397 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2400 lq_cmd->mimo_delim = is_mimo(&rate) ? 1 : 0;
2402 /* Fill 1st table entry (index 0) */
2403 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2405 if (num_of_ant(rate.ant) == 1)
2406 lq_cmd->single_stream_ant_msk = rate.ant;
2407 /* otherwise we don't modify the existing value */
2412 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2414 /* Fill rest of rate table */
2415 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2416 /* Repeat initial/next rate.
2417 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2418 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2419 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2420 if (is_legacy(&rate)) {
2421 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2424 rs_toggle_antenna(valid_tx_ant,
2429 /* Override next rate if needed for debug purposes */
2430 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2432 /* Fill next table entry */
2433 lq_cmd->rs_table[index] =
2434 cpu_to_le32(new_rate);
2439 rs_rate_from_ucode_rate(new_rate, lq_sta->band, &rate);
2441 /* Indicate to uCode which entries might be MIMO.
2442 * If initial rate was MIMO, this will finally end up
2443 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2445 lq_cmd->mimo_delim = index;
2448 new_rate = rs_get_lower_rate(lq_sta, &rate, rate.index,
2451 /* How many times should we repeat the next rate? */
2452 if (is_legacy(&rate)) {
2453 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2456 rs_toggle_antenna(valid_tx_ant,
2460 repeat_rate = IWL_NUMBER_TRY;
2462 repeat_rate = IWL_HT_NUMBER_TRY;
2465 /* Don't allow HT rates after next pass.
2466 * rs_get_lower_rate() will change type to LQ_LEGACY_A
2469 use_ht_possible = 0;
2471 /* Override next rate if needed for debug purposes */
2472 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2474 /* Fill next table entry */
2475 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2481 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2482 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2484 lq_cmd->agg_time_limit =
2485 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2488 lq_cmd->agg_time_limit =
2489 cpu_to_le16(iwl_mvm_bt_coex_agg_time_limit(mvm, sta));
2492 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2496 /* rate scale requires free function to be implemented */
2497 static void rs_free(void *mvm_rate)
2502 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2505 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2506 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2508 IWL_DEBUG_RATE(mvm, "enter\n");
2509 IWL_DEBUG_RATE(mvm, "leave\n");
2512 #ifdef CONFIG_MAC80211_DEBUGFS
2513 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2516 struct iwl_mvm *mvm;
2521 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2522 if (lq_sta->dbg_fixed_rate) {
2524 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2525 >> RATE_MCS_ANT_POS);
2526 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2527 *rate_n_flags = lq_sta->dbg_fixed_rate;
2529 lq_sta->dbg_fixed_rate = 0;
2531 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2532 ant_sel_tx, valid_tx_ant);
2533 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2538 static int rs_pretty_print_rate(char *buf, const u32 rate)
2542 u8 mcs = 0, nss = 0;
2543 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2545 if (!(rate & RATE_MCS_HT_MSK) &&
2546 !(rate & RATE_MCS_VHT_MSK)) {
2547 int index = iwl_hwrate_to_plcp_idx(rate);
2549 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2550 rs_pretty_ant(ant), iwl_rate_mcs[index].mbps);
2553 if (rate & RATE_MCS_VHT_MSK) {
2555 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2556 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2557 >> RATE_VHT_MCS_NSS_POS) + 1;
2558 } else if (rate & RATE_MCS_HT_MSK) {
2560 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2562 type = "Unknown"; /* shouldn't happen */
2565 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2566 case RATE_MCS_CHAN_WIDTH_20:
2569 case RATE_MCS_CHAN_WIDTH_40:
2572 case RATE_MCS_CHAN_WIDTH_80:
2575 case RATE_MCS_CHAN_WIDTH_160:
2582 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2583 type, rs_pretty_ant(ant), bw, mcs, nss,
2584 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2585 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
2586 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2587 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2588 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2592 * Program the device to use fixed rate for frame transmit
2593 * This is for debugging/testing only
2594 * once the device start use fixed rate, we need to reload the module
2595 * to being back the normal operation.
2597 static void rs_program_fix_rate(struct iwl_mvm *mvm,
2598 struct iwl_lq_sta *lq_sta)
2600 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2601 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2602 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2604 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
2605 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2607 if (lq_sta->dbg_fixed_rate) {
2608 rs_fill_link_cmd(NULL, NULL, lq_sta, lq_sta->dbg_fixed_rate);
2609 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
2613 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2614 const char __user *user_buf, size_t count, loff_t *ppos)
2616 struct iwl_lq_sta *lq_sta = file->private_data;
2617 struct iwl_mvm *mvm;
2624 memset(buf, 0, sizeof(buf));
2625 buf_size = min(count, sizeof(buf) - 1);
2626 if (copy_from_user(buf, user_buf, buf_size))
2629 if (sscanf(buf, "%x", &parsed_rate) == 1)
2630 lq_sta->dbg_fixed_rate = parsed_rate;
2632 lq_sta->dbg_fixed_rate = 0;
2634 rs_program_fix_rate(mvm, lq_sta);
2639 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2640 char __user *user_buf, size_t count, loff_t *ppos)
2647 struct iwl_lq_sta *lq_sta = file->private_data;
2648 struct iwl_mvm *mvm;
2649 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2650 struct rs_rate *rate = &tbl->rate;
2652 buff = kmalloc(2048, GFP_KERNEL);
2656 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2657 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2658 lq_sta->total_failed, lq_sta->total_success,
2659 lq_sta->active_legacy_rate);
2660 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2661 lq_sta->dbg_fixed_rate);
2662 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2663 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2664 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2665 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
2666 desc += sprintf(buff+desc, "lq type %s\n",
2667 (is_legacy(rate)) ? "legacy" :
2668 is_vht(rate) ? "VHT" : "HT");
2669 if (!is_legacy(rate)) {
2670 desc += sprintf(buff+desc, " %s",
2671 (is_siso(rate)) ? "SISO" : "MIMO2");
2672 desc += sprintf(buff+desc, " %s",
2673 (is_ht20(rate)) ? "20MHz" :
2674 (is_ht40(rate)) ? "40MHz" :
2675 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
2676 desc += sprintf(buff+desc, " %s %s\n",
2677 (rate->sgi) ? "SGI" : "NGI",
2678 (lq_sta->is_agg) ? "AGG on" : "");
2680 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2681 lq_sta->last_rate_n_flags);
2682 desc += sprintf(buff+desc,
2683 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
2685 lq_sta->lq.mimo_delim,
2686 lq_sta->lq.single_stream_ant_msk,
2687 lq_sta->lq.dual_stream_ant_msk);
2689 desc += sprintf(buff+desc,
2690 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2691 le16_to_cpu(lq_sta->lq.agg_time_limit),
2692 lq_sta->lq.agg_disable_start_th,
2693 lq_sta->lq.agg_frame_cnt_limit);
2695 desc += sprintf(buff+desc,
2696 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2697 lq_sta->lq.initial_rate_index[0],
2698 lq_sta->lq.initial_rate_index[1],
2699 lq_sta->lq.initial_rate_index[2],
2700 lq_sta->lq.initial_rate_index[3]);
2702 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2703 u32 rate = le32_to_cpu(lq_sta->lq.rs_table[i]);
2704 desc += sprintf(buff+desc,
2708 desc += rs_pretty_print_rate(buff+desc, rate);
2711 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2716 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2717 .write = rs_sta_dbgfs_scale_table_write,
2718 .read = rs_sta_dbgfs_scale_table_read,
2719 .open = simple_open,
2720 .llseek = default_llseek,
2722 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2723 char __user *user_buf, size_t count, loff_t *ppos)
2729 struct iwl_scale_tbl_info *tbl;
2730 struct rs_rate *rate;
2731 struct iwl_lq_sta *lq_sta = file->private_data;
2733 buff = kmalloc(1024, GFP_KERNEL);
2737 for (i = 0; i < LQ_SIZE; i++) {
2738 tbl = &(lq_sta->lq_info[i]);
2740 desc += sprintf(buff+desc,
2741 "%s type=%d SGI=%d BW=%s DUP=0\n"
2743 lq_sta->active_tbl == i ? "*" : "x",
2746 is_ht20(rate) ? "20Mhz" :
2747 is_ht40(rate) ? "40Mhz" :
2748 is_ht80(rate) ? "80Mhz" : "ERR",
2750 for (j = 0; j < IWL_RATE_COUNT; j++) {
2751 desc += sprintf(buff+desc,
2752 "counter=%d success=%d %%=%d\n",
2753 tbl->win[j].counter,
2754 tbl->win[j].success_counter,
2755 tbl->win[j].success_ratio);
2758 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2763 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2764 .read = rs_sta_dbgfs_stats_table_read,
2765 .open = simple_open,
2766 .llseek = default_llseek,
2769 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2771 struct iwl_lq_sta *lq_sta = mvm_sta;
2772 lq_sta->rs_sta_dbgfs_scale_table_file =
2773 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2774 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2775 lq_sta->rs_sta_dbgfs_stats_table_file =
2776 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2777 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2778 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2779 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2780 &lq_sta->tx_agg_tid_en);
2783 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2785 struct iwl_lq_sta *lq_sta = mvm_sta;
2786 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2787 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2788 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2793 * Initialization of rate scaling information is done by driver after
2794 * the station is added. Since mac80211 calls this function before a
2795 * station is added we ignore it.
2797 static void rs_rate_init_stub(void *mvm_r,
2798 struct ieee80211_supported_band *sband,
2799 struct cfg80211_chan_def *chandef,
2800 struct ieee80211_sta *sta, void *mvm_sta)
2803 static struct rate_control_ops rs_mvm_ops = {
2806 .tx_status = rs_tx_status,
2807 .get_rate = rs_get_rate,
2808 .rate_init = rs_rate_init_stub,
2811 .alloc_sta = rs_alloc_sta,
2812 .free_sta = rs_free_sta,
2813 .rate_update = rs_rate_update,
2814 #ifdef CONFIG_MAC80211_DEBUGFS
2815 .add_sta_debugfs = rs_add_debugfs,
2816 .remove_sta_debugfs = rs_remove_debugfs,
2820 int iwl_mvm_rate_control_register(void)
2822 return ieee80211_rate_control_register(&rs_mvm_ops);
2825 void iwl_mvm_rate_control_unregister(void)
2827 ieee80211_rate_control_unregister(&rs_mvm_ops);
2831 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2832 * Tx protection, according to this rquest and previous requests,
2833 * and send the LQ command.
2834 * @mvmsta: The station
2835 * @enable: Enable Tx protection?
2837 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2840 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2842 lockdep_assert_held(&mvm->mutex);
2845 if (mvmsta->tx_protection == 0)
2846 lq->flags |= LQ_FLAG_USE_RTS_MSK;
2847 mvmsta->tx_protection++;
2849 mvmsta->tx_protection--;
2850 if (mvmsta->tx_protection == 0)
2851 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
2854 return iwl_mvm_send_lq_cmd(mvm, lq, false);