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 NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define RS_LEGACY_RETRIES_PER_RATE 1
47 #define RS_HT_VHT_RETRIES_PER_RATE 2
48 #define RS_HT_VHT_RETRIES_PER_RATE_TW 1
49 #define RS_INITIAL_MIMO_NUM_RATES 3
50 #define RS_INITIAL_SISO_NUM_RATES 3
51 #define RS_INITIAL_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM
52 #define RS_SECONDARY_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM
53 #define RS_SECONDARY_SISO_NUM_RATES 3
54 #define RS_SECONDARY_SISO_RETRIES 1
56 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
57 #define IWL_RATE_MIN_FAILURE_TH 3 /* min failures to calc tpt */
58 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
60 /* max allowed rate miss before sync LQ cmd */
61 #define IWL_MISSED_RATE_MAX 15
62 #define RS_STAY_IN_COLUMN_TIMEOUT (5*HZ)
63 #define RS_IDLE_TIMEOUT (5*HZ)
65 static u8 rs_ht_to_legacy[] = {
66 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
67 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
68 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
69 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
70 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
71 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
72 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
73 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
74 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
75 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
78 static const u8 ant_toggle_lookup[] = {
79 [ANT_NONE] = ANT_NONE,
89 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
90 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
91 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
92 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
93 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
94 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
95 IWL_RATE_##rp##M_INDEX, \
96 IWL_RATE_##rn##M_INDEX }
98 #define IWL_DECLARE_MCS_RATE(s) \
99 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
100 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
101 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
102 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
103 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
104 IWL_RATE_INVM_INDEX, \
105 IWL_RATE_INVM_INDEX }
109 * rate, ht rate, prev rate, next rate
111 * If there isn't a valid next or previous rate then INV is used which
112 * maps to IWL_RATE_INVALID
115 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
116 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
117 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
118 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
119 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
120 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
121 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
122 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
123 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
124 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
125 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
126 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
127 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
128 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
129 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
130 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
135 RS_ACTION_DOWNSCALE = -1,
136 RS_ACTION_UPSCALE = 1,
139 enum rs_column_mode {
146 #define MAX_NEXT_COLUMNS 7
147 #define MAX_COLUMN_CHECKS 3
149 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
150 struct ieee80211_sta *sta,
151 struct iwl_scale_tbl_info *tbl);
153 struct rs_tx_column {
154 enum rs_column_mode mode;
157 enum rs_column next_columns[MAX_NEXT_COLUMNS];
158 allow_column_func_t checks[MAX_COLUMN_CHECKS];
161 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
162 struct iwl_scale_tbl_info *tbl)
164 if (!sta->ht_cap.ht_supported)
167 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
170 if (num_of_ant(mvm->fw->valid_tx_ant) < 2)
173 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
179 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
180 struct iwl_scale_tbl_info *tbl)
182 if (!sta->ht_cap.ht_supported)
188 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
189 struct iwl_scale_tbl_info *tbl)
191 struct rs_rate *rate = &tbl->rate;
192 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
193 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
195 if (is_ht20(rate) && (ht_cap->cap &
196 IEEE80211_HT_CAP_SGI_20))
198 if (is_ht40(rate) && (ht_cap->cap &
199 IEEE80211_HT_CAP_SGI_40))
201 if (is_ht80(rate) && (vht_cap->cap &
202 IEEE80211_VHT_CAP_SHORT_GI_80))
208 static const struct rs_tx_column rs_tx_columns[] = {
209 [RS_COLUMN_LEGACY_ANT_A] = {
213 RS_COLUMN_LEGACY_ANT_B,
214 RS_COLUMN_SISO_ANT_A,
222 [RS_COLUMN_LEGACY_ANT_B] = {
226 RS_COLUMN_LEGACY_ANT_A,
227 RS_COLUMN_SISO_ANT_B,
235 [RS_COLUMN_SISO_ANT_A] = {
239 RS_COLUMN_SISO_ANT_B,
241 RS_COLUMN_SISO_ANT_A_SGI,
242 RS_COLUMN_LEGACY_ANT_A,
243 RS_COLUMN_LEGACY_ANT_B,
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,
267 [RS_COLUMN_SISO_ANT_A_SGI] = {
272 RS_COLUMN_SISO_ANT_B_SGI,
274 RS_COLUMN_SISO_ANT_A,
275 RS_COLUMN_LEGACY_ANT_A,
276 RS_COLUMN_LEGACY_ANT_B,
285 [RS_COLUMN_SISO_ANT_B_SGI] = {
290 RS_COLUMN_SISO_ANT_A_SGI,
292 RS_COLUMN_SISO_ANT_B,
293 RS_COLUMN_LEGACY_ANT_A,
294 RS_COLUMN_LEGACY_ANT_B,
303 [RS_COLUMN_MIMO2] = {
307 RS_COLUMN_SISO_ANT_A,
309 RS_COLUMN_LEGACY_ANT_A,
310 RS_COLUMN_LEGACY_ANT_B,
319 [RS_COLUMN_MIMO2_SGI] = {
324 RS_COLUMN_SISO_ANT_A_SGI,
326 RS_COLUMN_LEGACY_ANT_A,
327 RS_COLUMN_LEGACY_ANT_B,
339 static inline u8 rs_extract_rate(u32 rate_n_flags)
341 /* also works for HT because bits 7:6 are zero there */
342 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
345 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
349 if (rate_n_flags & RATE_MCS_HT_MSK) {
350 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
351 idx += IWL_RATE_MCS_0_INDEX;
353 /* skip 9M not supported in HT*/
354 if (idx >= IWL_RATE_9M_INDEX)
356 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
358 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
359 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
360 idx += IWL_RATE_MCS_0_INDEX;
362 /* skip 9M not supported in VHT*/
363 if (idx >= IWL_RATE_9M_INDEX)
365 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
368 /* legacy rate format, search for match in table */
370 u8 legacy_rate = rs_extract_rate(rate_n_flags);
371 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
372 if (iwl_rates[idx].plcp == legacy_rate)
376 return IWL_RATE_INVALID;
379 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
381 struct ieee80211_sta *sta,
382 struct iwl_lq_sta *lq_sta);
383 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
384 struct ieee80211_sta *sta,
385 struct iwl_lq_sta *lq_sta,
386 const struct rs_rate *initial_rate);
387 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
390 * The following tables contain the expected throughput metrics for all rates
392 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
394 * where invalid entries are zeros.
396 * CCK rates are only valid in legacy table and will only be used in G
400 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
401 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
404 /* Expected TpT tables. 4 indexes:
405 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
407 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
408 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
409 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
410 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
411 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
414 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
415 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
416 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
417 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
418 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
421 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
422 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
423 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
424 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
425 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
428 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
429 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
430 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
431 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
432 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
435 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
436 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
437 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
438 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
439 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
442 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
443 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
444 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
445 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
446 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
450 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
459 { "24", "16QAM 1/2"},
460 { "36", "16QAM 3/4"},
461 { "48", "64QAM 2/3"},
462 { "54", "64QAM 3/4"},
463 { "60", "64QAM 5/6"},
466 #define MCS_INDEX_PER_STREAM (8)
468 static const char *rs_pretty_ant(u8 ant)
470 static const char * const ant_name[] = {
484 return ant_name[ant];
487 static const char *rs_pretty_lq_type(enum iwl_table_type type)
489 static const char * const lq_types[] = {
491 [LQ_LEGACY_A] = "LEGACY_A",
492 [LQ_LEGACY_G] = "LEGACY_G",
493 [LQ_HT_SISO] = "HT SISO",
494 [LQ_HT_MIMO2] = "HT MIMO",
495 [LQ_VHT_SISO] = "VHT SISO",
496 [LQ_VHT_MIMO2] = "VHT MIMO",
499 if (type < LQ_NONE || type >= LQ_MAX)
502 return lq_types[type];
505 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
508 IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d\n",
509 prefix, rs_pretty_lq_type(rate->type),
510 rate->index, rs_pretty_ant(rate->ant),
511 rate->bw, rate->sgi, rate->ldpc);
514 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
517 window->success_counter = 0;
518 window->success_ratio = IWL_INVALID_VALUE;
520 window->average_tpt = IWL_INVALID_VALUE;
523 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
524 struct iwl_scale_tbl_info *tbl)
528 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
529 for (i = 0; i < IWL_RATE_COUNT; i++)
530 rs_rate_scale_clear_window(&tbl->win[i]);
532 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
533 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
536 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
538 return (ant_type & valid_antenna) == ant_type;
541 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
542 struct iwl_lq_sta *lq_data, u8 tid,
543 struct ieee80211_sta *sta)
547 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
549 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
550 if (ret == -EAGAIN) {
552 * driver and mac80211 is out of sync
553 * this might be cause by reloading firmware
554 * stop the tx ba session here
556 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
558 ieee80211_stop_tx_ba_session(sta, tid);
563 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
564 struct iwl_lq_sta *lq_data,
565 struct ieee80211_sta *sta)
567 if (tid < IWL_MAX_TID_COUNT)
568 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
570 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
571 tid, IWL_MAX_TID_COUNT);
574 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
576 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
577 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
578 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
582 * Static function to get the expected throughput from an iwl_scale_tbl_info
583 * that wraps a NULL pointer check
585 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
587 if (tbl->expected_tpt)
588 return tbl->expected_tpt[rs_index];
593 * rs_collect_tx_data - Update the success/failure sliding window
595 * We keep a sliding window of the last 62 packets transmitted
596 * at this rate. window->data contains the bitmask of successful
599 static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
600 int scale_index, int attempts, int successes,
601 struct iwl_rate_scale_data *window)
603 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
606 /* Get expected throughput */
607 tpt = get_expected_tpt(tbl, scale_index);
610 * Keep track of only the latest 62 tx frame attempts in this rate's
611 * history window; anything older isn't really relevant any more.
612 * If we have filled up the sliding window, drop the oldest attempt;
613 * if the oldest attempt (highest bit in bitmap) shows "success",
614 * subtract "1" from the success counter (this is the main reason
615 * we keep these bitmaps!).
617 while (attempts > 0) {
618 if (window->counter >= IWL_RATE_MAX_WINDOW) {
619 /* remove earliest */
620 window->counter = IWL_RATE_MAX_WINDOW - 1;
622 if (window->data & mask) {
623 window->data &= ~mask;
624 window->success_counter--;
628 /* Increment frames-attempted counter */
631 /* Shift bitmap by one frame to throw away oldest history */
634 /* Mark the most recent #successes attempts as successful */
636 window->success_counter++;
644 /* Calculate current success ratio, avoid divide-by-0! */
645 if (window->counter > 0)
646 window->success_ratio = 128 * (100 * window->success_counter)
649 window->success_ratio = IWL_INVALID_VALUE;
651 fail_count = window->counter - window->success_counter;
653 /* Calculate average throughput, if we have enough history. */
654 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
655 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
656 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
658 window->average_tpt = IWL_INVALID_VALUE;
663 static int rs_collect_tx_data(struct iwl_lq_sta *lq_sta,
664 struct iwl_scale_tbl_info *tbl,
665 int scale_index, int attempts, int successes,
668 struct iwl_rate_scale_data *window = NULL;
671 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
674 if (tbl->column != RS_COLUMN_INVALID) {
675 struct lq_sta_pers *pers = &lq_sta->pers;
677 pers->tx_stats[tbl->column][scale_index].total += attempts;
678 pers->tx_stats[tbl->column][scale_index].success += successes;
681 /* Select window for current tx bit rate */
682 window = &(tbl->win[scale_index]);
684 ret = _rs_collect_tx_data(tbl, scale_index, attempts, successes,
689 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
692 window = &tbl->tpc_win[reduced_txp];
693 return _rs_collect_tx_data(tbl, scale_index, attempts, successes,
697 /* Convert rs_rate object into ucode rate bitmask */
698 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
699 struct rs_rate *rate)
702 int index = rate->index;
704 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
705 RATE_MCS_ANT_ABC_MSK);
707 if (is_legacy(rate)) {
708 ucode_rate |= iwl_rates[index].plcp;
709 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
710 ucode_rate |= RATE_MCS_CCK_MSK;
715 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
716 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
717 index = IWL_LAST_HT_RATE;
719 ucode_rate |= RATE_MCS_HT_MSK;
721 if (is_ht_siso(rate))
722 ucode_rate |= iwl_rates[index].plcp_ht_siso;
723 else if (is_ht_mimo2(rate))
724 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
727 } else if (is_vht(rate)) {
728 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
729 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
730 index = IWL_LAST_VHT_RATE;
732 ucode_rate |= RATE_MCS_VHT_MSK;
733 if (is_vht_siso(rate))
734 ucode_rate |= iwl_rates[index].plcp_vht_siso;
735 else if (is_vht_mimo2(rate))
736 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
741 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
744 ucode_rate |= rate->bw;
746 ucode_rate |= RATE_MCS_SGI_MSK;
748 ucode_rate |= RATE_MCS_LDPC_MSK;
753 /* Convert a ucode rate into an rs_rate object */
754 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
755 enum ieee80211_band band,
756 struct rs_rate *rate)
758 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
759 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
762 memset(rate, 0, sizeof(*rate));
763 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
765 if (rate->index == IWL_RATE_INVALID)
768 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
771 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
772 !(ucode_rate & RATE_MCS_VHT_MSK)) {
773 if (num_of_ant == 1) {
774 if (band == IEEE80211_BAND_5GHZ)
775 rate->type = LQ_LEGACY_A;
777 rate->type = LQ_LEGACY_G;
784 if (ucode_rate & RATE_MCS_SGI_MSK)
786 if (ucode_rate & RATE_MCS_LDPC_MSK)
789 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
791 if (ucode_rate & RATE_MCS_HT_MSK) {
792 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
793 RATE_HT_MCS_NSS_POS) + 1;
796 rate->type = LQ_HT_SISO;
797 WARN_ON_ONCE(num_of_ant != 1);
798 } else if (nss == 2) {
799 rate->type = LQ_HT_MIMO2;
800 WARN_ON_ONCE(num_of_ant != 2);
804 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
805 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
806 RATE_VHT_MCS_NSS_POS) + 1;
809 rate->type = LQ_VHT_SISO;
810 WARN_ON_ONCE(num_of_ant != 1);
811 } else if (nss == 2) {
812 rate->type = LQ_VHT_MIMO2;
813 WARN_ON_ONCE(num_of_ant != 2);
819 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
820 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
826 /* switch to another antenna/antennas and return 1 */
827 /* if no other valid antenna found, return 0 */
828 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
832 if (!rate->ant || rate->ant > ANT_ABC)
835 if (!rs_is_valid_ant(valid_ant, rate->ant))
838 new_ant_type = ant_toggle_lookup[rate->ant];
840 while ((new_ant_type != rate->ant) &&
841 !rs_is_valid_ant(valid_ant, new_ant_type))
842 new_ant_type = ant_toggle_lookup[new_ant_type];
844 if (new_ant_type == rate->ant)
847 rate->ant = new_ant_type;
852 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
853 struct rs_rate *rate)
856 return lq_sta->active_legacy_rate;
857 else if (is_siso(rate))
858 return lq_sta->active_siso_rate;
859 else if (is_mimo2(rate))
860 return lq_sta->active_mimo2_rate;
866 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
869 u8 high = IWL_RATE_INVALID;
870 u8 low = IWL_RATE_INVALID;
872 /* 802.11A or ht walks to the next literal adjacent rate in
874 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
878 /* Find the previous rate that is in the rate mask */
880 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
881 if (rate_mask & mask) {
887 /* Find the next rate that is in the rate mask */
889 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
890 if (rate_mask & mask) {
896 return (high << 8) | low;
900 while (low != IWL_RATE_INVALID) {
901 low = iwl_rates[low].prev_rs;
902 if (low == IWL_RATE_INVALID)
904 if (rate_mask & (1 << low))
906 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
910 while (high != IWL_RATE_INVALID) {
911 high = iwl_rates[high].next_rs;
912 if (high == IWL_RATE_INVALID)
914 if (rate_mask & (1 << high))
916 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
919 return (high << 8) | low;
922 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
923 struct rs_rate *rate)
925 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
928 /* Get the next supported lower rate in the current column.
929 * Return true if bottom rate in the current column was reached
931 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
932 struct rs_rate *rate)
937 struct iwl_mvm *mvm = lq_sta->pers.drv;
939 rate_mask = rs_get_supported_rates(lq_sta, rate);
940 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
942 low = high_low & 0xff;
944 /* Bottom rate of column reached */
945 if (low == IWL_RATE_INVALID)
952 /* Get the next rate to use following a column downgrade */
953 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
954 struct rs_rate *rate)
956 struct iwl_mvm *mvm = lq_sta->pers.drv;
958 if (is_legacy(rate)) {
959 /* No column to downgrade from Legacy */
961 } else if (is_siso(rate)) {
962 /* Downgrade to Legacy if we were in SISO */
963 if (lq_sta->band == IEEE80211_BAND_5GHZ)
964 rate->type = LQ_LEGACY_A;
966 rate->type = LQ_LEGACY_G;
968 rate->bw = RATE_MCS_CHAN_WIDTH_20;
970 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
971 rate->index > IWL_RATE_MCS_9_INDEX);
973 rate->index = rs_ht_to_legacy[rate->index];
976 /* Downgrade to SISO with same MCS if in MIMO */
977 rate->type = is_vht_mimo2(rate) ?
978 LQ_VHT_SISO : LQ_HT_SISO;
981 if (num_of_ant(rate->ant) > 1)
982 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
984 /* Relevant in both switching to SISO or Legacy */
987 if (!rs_rate_supported(lq_sta, rate))
988 rs_get_lower_rate_in_column(lq_sta, rate);
991 /* Simple function to compare two rate scale table types */
992 static inline bool rs_rate_match(struct rs_rate *a,
995 return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
998 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1000 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1001 return RATE_MCS_CHAN_WIDTH_40;
1002 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1003 return RATE_MCS_CHAN_WIDTH_80;
1004 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1005 return RATE_MCS_CHAN_WIDTH_160;
1007 return RATE_MCS_CHAN_WIDTH_20;
1011 * mac80211 sends us Tx status
1013 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
1014 struct ieee80211_sta *sta, void *priv_sta,
1015 struct sk_buff *skb)
1020 struct iwl_lq_sta *lq_sta = priv_sta;
1021 struct iwl_lq_cmd *table;
1022 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1023 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1024 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1025 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1026 enum mac80211_rate_control_flags mac_flags;
1028 struct rs_rate rate;
1029 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1030 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1032 /* Treat uninitialized rate scaling data same as non-existing. */
1034 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1036 } else if (!lq_sta->pers.drv) {
1037 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1041 #ifdef CONFIG_MAC80211_DEBUGFS
1042 /* Disable last tx check if we are debugging with fixed rate */
1043 if (lq_sta->pers.dbg_fixed_rate) {
1044 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1048 if (!ieee80211_is_data(hdr->frame_control) ||
1049 info->flags & IEEE80211_TX_CTL_NO_ACK)
1052 /* This packet was aggregated but doesn't carry status info */
1053 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1054 !(info->flags & IEEE80211_TX_STAT_AMPDU))
1058 * Ignore this Tx frame response if its initial rate doesn't match
1059 * that of latest Link Quality command. There may be stragglers
1060 * from a previous Link Quality command, but we're no longer interested
1061 * in those; they're either from the "active" mode while we're trying
1062 * to check "search" mode, or a prior "search" mode after we've moved
1063 * to a new "search" mode (which might become the new "active" mode).
1065 table = &lq_sta->lq;
1066 ucode_rate = le32_to_cpu(table->rs_table[0]);
1067 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1068 if (info->band == IEEE80211_BAND_5GHZ)
1069 rate.index -= IWL_FIRST_OFDM_RATE;
1070 mac_flags = info->status.rates[0].flags;
1071 mac_index = info->status.rates[0].idx;
1072 /* For HT packets, map MCS to PLCP */
1073 if (mac_flags & IEEE80211_TX_RC_MCS) {
1074 /* Remove # of streams */
1075 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1076 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1079 * mac80211 HT index is always zero-indexed; we need to move
1080 * HT OFDM rates after CCK rates in 2.4 GHz band
1082 if (info->band == IEEE80211_BAND_2GHZ)
1083 mac_index += IWL_FIRST_OFDM_RATE;
1084 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1085 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1086 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1090 if (time_after(jiffies,
1091 (unsigned long)(lq_sta->last_tx + RS_IDLE_TIMEOUT))) {
1093 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1094 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
1095 ieee80211_stop_tx_ba_session(sta, tid);
1097 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
1100 lq_sta->last_tx = jiffies;
1102 /* Here we actually compare this rate to the latest LQ command */
1103 if ((mac_index < 0) ||
1104 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1105 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1106 (rate.ant != info->status.antenna) ||
1107 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1108 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1109 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1110 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1111 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1112 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1113 (rate.index != mac_index)) {
1115 "initial rate %d does not match %d (0x%x)\n",
1116 mac_index, rate.index, ucode_rate);
1118 * Since rates mis-match, the last LQ command may have failed.
1119 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1122 lq_sta->missed_rate_counter++;
1123 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1124 lq_sta->missed_rate_counter = 0;
1126 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1128 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1130 /* Regardless, ignore this status info for outdated rate */
1133 /* Rate did match, so reset the missed_rate_counter */
1134 lq_sta->missed_rate_counter = 0;
1136 /* Figure out if rate scale algorithm is in active or search table */
1137 if (rs_rate_match(&rate,
1138 &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1139 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1140 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1141 } else if (rs_rate_match(&rate,
1142 &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1143 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1144 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1147 "Neither active nor search matches tx rate\n");
1148 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1149 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1150 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1151 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1152 rs_dump_rate(mvm, &rate, "ACTUAL");
1155 * no matching table found, let's by-pass the data collection
1156 * and continue to perform rate scale to find the rate table
1158 rs_stay_in_table(lq_sta, true);
1163 * Updating the frame history depends on whether packets were
1166 * For aggregation, all packets were transmitted at the same rate, the
1167 * first index into rate scale table.
1169 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1170 ucode_rate = le32_to_cpu(table->rs_table[0]);
1171 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1172 rs_collect_tx_data(lq_sta, curr_tbl, rate.index,
1173 info->status.ampdu_len,
1174 info->status.ampdu_ack_len,
1177 /* Update success/fail counts if not searching for new mode */
1178 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1179 lq_sta->total_success += info->status.ampdu_ack_len;
1180 lq_sta->total_failed += (info->status.ampdu_len -
1181 info->status.ampdu_ack_len);
1185 * For legacy, update frame history with for each Tx retry.
1187 retries = info->status.rates[0].count - 1;
1188 /* HW doesn't send more than 15 retries */
1189 retries = min(retries, 15);
1191 /* The last transmission may have been successful */
1192 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1193 /* Collect data for each rate used during failed TX attempts */
1194 for (i = 0; i <= retries; ++i) {
1195 ucode_rate = le32_to_cpu(table->rs_table[i]);
1196 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1198 * Only collect stats if retried rate is in the same RS
1199 * table as active/search.
1201 if (rs_rate_match(&rate, &curr_tbl->rate))
1203 else if (rs_rate_match(&rate, &other_tbl->rate))
1204 tmp_tbl = other_tbl;
1208 rs_collect_tx_data(lq_sta, tmp_tbl, rate.index, 1,
1209 i < retries ? 0 : legacy_success,
1213 /* Update success/fail counts if not searching for new mode */
1214 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1215 lq_sta->total_success += legacy_success;
1216 lq_sta->total_failed += retries + (1 - legacy_success);
1219 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1220 lq_sta->last_rate_n_flags = ucode_rate;
1221 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1223 /* See if there's a better rate or modulation mode to try. */
1224 if (sta && sta->supp_rates[sband->band])
1225 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1229 * Begin a period of staying with a selected modulation mode.
1230 * Set "stay_in_tbl" flag to prevent any mode switches.
1231 * Set frame tx success limits according to legacy vs. high-throughput,
1232 * and reset overall (spanning all rates) tx success history statistics.
1233 * These control how long we stay using same modulation mode before
1234 * searching for a new mode.
1236 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1237 struct iwl_lq_sta *lq_sta)
1239 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1240 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1242 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1243 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1244 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1246 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1247 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1248 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1250 lq_sta->table_count = 0;
1251 lq_sta->total_failed = 0;
1252 lq_sta->total_success = 0;
1253 lq_sta->flush_timer = jiffies;
1254 lq_sta->visited_columns = 0;
1257 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1258 const struct rs_tx_column *column)
1260 switch (column->mode) {
1262 return lq_sta->max_legacy_rate_idx;
1264 return lq_sta->max_siso_rate_idx;
1266 return lq_sta->max_mimo2_rate_idx;
1271 return lq_sta->max_legacy_rate_idx;
1274 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1275 const struct rs_tx_column *column,
1278 /* Used to choose among HT tables */
1279 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1281 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1282 column->mode != RS_SISO &&
1283 column->mode != RS_MIMO2))
1284 return expected_tpt_legacy;
1286 /* Legacy rates have only one table */
1287 if (column->mode == RS_LEGACY)
1288 return expected_tpt_legacy;
1290 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1291 /* Choose among many HT tables depending on number of streams
1292 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1294 if (column->mode == RS_SISO) {
1296 case RATE_MCS_CHAN_WIDTH_20:
1297 ht_tbl_pointer = expected_tpt_siso_20MHz;
1299 case RATE_MCS_CHAN_WIDTH_40:
1300 ht_tbl_pointer = expected_tpt_siso_40MHz;
1302 case RATE_MCS_CHAN_WIDTH_80:
1303 ht_tbl_pointer = expected_tpt_siso_80MHz;
1308 } else if (column->mode == RS_MIMO2) {
1310 case RATE_MCS_CHAN_WIDTH_20:
1311 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1313 case RATE_MCS_CHAN_WIDTH_40:
1314 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1316 case RATE_MCS_CHAN_WIDTH_80:
1317 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1326 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1327 return ht_tbl_pointer[0];
1328 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1329 return ht_tbl_pointer[1];
1330 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1331 return ht_tbl_pointer[2];
1333 return ht_tbl_pointer[3];
1336 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1337 struct iwl_scale_tbl_info *tbl)
1339 struct rs_rate *rate = &tbl->rate;
1340 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1342 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1345 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1346 struct iwl_lq_sta *lq_sta,
1347 struct iwl_scale_tbl_info *tbl, /* "search" */
1348 unsigned long rate_mask, s8 index)
1350 struct iwl_scale_tbl_info *active_tbl =
1351 &(lq_sta->lq_info[lq_sta->active_tbl]);
1352 s32 success_ratio = active_tbl->win[index].success_ratio;
1353 u16 expected_current_tpt = active_tbl->expected_tpt[index];
1354 const u16 *tpt_tbl = tbl->expected_tpt;
1359 if (success_ratio > RS_SR_NO_DECREASE) {
1360 target_tpt = 100 * expected_current_tpt;
1362 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1363 success_ratio, target_tpt);
1365 target_tpt = lq_sta->last_tpt;
1367 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1368 success_ratio, target_tpt);
1371 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1373 while (rate_idx != IWL_RATE_INVALID) {
1374 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1377 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1380 rate_idx = (high_low >> 8) & 0xff;
1383 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1384 rate_idx, target_tpt,
1385 rate_idx != IWL_RATE_INVALID ?
1386 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1391 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1393 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1394 return RATE_MCS_CHAN_WIDTH_80;
1395 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1396 return RATE_MCS_CHAN_WIDTH_40;
1398 return RATE_MCS_CHAN_WIDTH_20;
1402 * Check whether we should continue using same modulation mode, or
1403 * begin search for a new mode, based on:
1404 * 1) # tx successes or failures while using this mode
1405 * 2) # times calling this function
1406 * 3) elapsed time in this mode (not used, for now)
1408 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1410 struct iwl_scale_tbl_info *tbl;
1412 int flush_interval_passed = 0;
1413 struct iwl_mvm *mvm;
1415 mvm = lq_sta->pers.drv;
1416 active_tbl = lq_sta->active_tbl;
1418 tbl = &(lq_sta->lq_info[active_tbl]);
1420 /* If we've been disallowing search, see if we should now allow it */
1421 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1422 /* Elapsed time using current modulation mode */
1423 if (lq_sta->flush_timer)
1424 flush_interval_passed =
1426 (unsigned long)(lq_sta->flush_timer +
1427 RS_STAY_IN_COLUMN_TIMEOUT));
1430 * Check if we should allow search for new modulation mode.
1431 * If many frames have failed or succeeded, or we've used
1432 * this same modulation for a long time, allow search, and
1433 * reset history stats that keep track of whether we should
1434 * allow a new search. Also (below) reset all bitmaps and
1435 * stats in active history.
1438 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1439 (lq_sta->total_success > lq_sta->max_success_limit) ||
1440 ((!lq_sta->search_better_tbl) &&
1441 (lq_sta->flush_timer) && (flush_interval_passed))) {
1443 "LQ: stay is expired %d %d %d\n",
1444 lq_sta->total_failed,
1445 lq_sta->total_success,
1446 flush_interval_passed);
1448 /* Allow search for new mode */
1449 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1451 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1452 lq_sta->total_failed = 0;
1453 lq_sta->total_success = 0;
1454 lq_sta->flush_timer = 0;
1455 /* mark the current column as visited */
1456 lq_sta->visited_columns = BIT(tbl->column);
1458 * Else if we've used this modulation mode enough repetitions
1459 * (regardless of elapsed time or success/failure), reset
1460 * history bitmaps and rate-specific stats for all rates in
1464 lq_sta->table_count++;
1465 if (lq_sta->table_count >=
1466 lq_sta->table_count_limit) {
1467 lq_sta->table_count = 0;
1470 "LQ: stay in table clear win\n");
1471 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1475 /* If transitioning to allow "search", reset all history
1476 * bitmaps and stats in active table (this will become the new
1477 * "search" table). */
1478 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1479 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1485 * setup rate table in uCode
1487 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1488 struct ieee80211_sta *sta,
1489 struct iwl_lq_sta *lq_sta,
1490 struct rs_rate *rate)
1492 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1493 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1496 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1497 struct ieee80211_hdr *hdr)
1499 u8 tid = IWL_MAX_TID_COUNT;
1501 if (ieee80211_is_data_qos(hdr->frame_control)) {
1502 u8 *qc = ieee80211_get_qos_ctl(hdr);
1506 if (unlikely(tid > IWL_MAX_TID_COUNT))
1507 tid = IWL_MAX_TID_COUNT;
1512 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1513 struct iwl_lq_sta *lq_sta,
1514 struct ieee80211_sta *sta,
1515 struct iwl_scale_tbl_info *tbl)
1518 enum rs_column next_col_id;
1519 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1520 const struct rs_tx_column *next_col;
1521 allow_column_func_t allow_func;
1522 u8 valid_ants = mvm->fw->valid_tx_ant;
1523 const u16 *expected_tpt_tbl;
1524 u16 tpt, max_expected_tpt;
1526 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1527 next_col_id = curr_col->next_columns[i];
1529 if (next_col_id == RS_COLUMN_INVALID)
1532 if (lq_sta->visited_columns & BIT(next_col_id)) {
1533 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1538 next_col = &rs_tx_columns[next_col_id];
1540 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1542 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1543 next_col_id, valid_ants, next_col->ant);
1547 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1548 allow_func = next_col->checks[j];
1549 if (allow_func && !allow_func(mvm, sta, tbl))
1553 if (j != MAX_COLUMN_CHECKS) {
1555 "Skip column %d: not allowed (check %d failed)\n",
1561 tpt = lq_sta->last_tpt / 100;
1562 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1563 rs_bw_from_sta_bw(sta));
1564 if (WARN_ON_ONCE(!expected_tpt_tbl))
1567 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1568 if (WARN_ON_ONCE(max_rate == IWL_RATE_INVALID))
1571 max_expected_tpt = expected_tpt_tbl[max_rate];
1572 if (tpt >= max_expected_tpt) {
1574 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1575 next_col_id, max_expected_tpt, tpt);
1580 "Found potential column %d. Max expected %d current %d\n",
1581 next_col_id, max_expected_tpt, tpt);
1585 if (i == MAX_NEXT_COLUMNS)
1586 return RS_COLUMN_INVALID;
1591 static int rs_switch_to_column(struct iwl_mvm *mvm,
1592 struct iwl_lq_sta *lq_sta,
1593 struct ieee80211_sta *sta,
1594 enum rs_column col_id)
1596 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1597 struct iwl_scale_tbl_info *search_tbl =
1598 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1599 struct rs_rate *rate = &search_tbl->rate;
1600 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1601 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1602 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1603 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1604 unsigned long rate_mask = 0;
1607 memcpy(search_tbl, tbl, sz);
1609 rate->sgi = column->sgi;
1610 rate->ant = column->ant;
1612 if (column->mode == RS_LEGACY) {
1613 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1614 rate->type = LQ_LEGACY_A;
1616 rate->type = LQ_LEGACY_G;
1618 rate_mask = lq_sta->active_legacy_rate;
1619 } else if (column->mode == RS_SISO) {
1620 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1621 rate_mask = lq_sta->active_siso_rate;
1622 } else if (column->mode == RS_MIMO2) {
1623 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1624 rate_mask = lq_sta->active_mimo2_rate;
1626 WARN_ON_ONCE("Bad column mode");
1629 rate->bw = rs_bw_from_sta_bw(sta);
1630 rate->ldpc = lq_sta->ldpc;
1631 search_tbl->column = col_id;
1632 rs_set_expected_tpt_table(lq_sta, search_tbl);
1634 lq_sta->visited_columns |= BIT(col_id);
1636 /* Get the best matching rate if we're changing modes. e.g.
1637 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1639 if (curr_column->mode != column->mode) {
1640 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1641 rate_mask, rate->index);
1643 if ((rate_idx == IWL_RATE_INVALID) ||
1644 !(BIT(rate_idx) & rate_mask)) {
1646 "can not switch with index %d"
1648 rate_idx, rate_mask);
1653 rate->index = rate_idx;
1656 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1657 col_id, rate->index);
1662 rate->type = LQ_NONE;
1666 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1667 struct iwl_scale_tbl_info *tbl,
1668 s32 sr, int low, int high,
1670 int low_tpt, int high_tpt)
1672 enum rs_action action = RS_ACTION_STAY;
1674 if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1676 "Decrease rate because of low SR\n");
1677 return RS_ACTION_DOWNSCALE;
1680 if ((low_tpt == IWL_INVALID_VALUE) &&
1681 (high_tpt == IWL_INVALID_VALUE) &&
1682 (high != IWL_RATE_INVALID)) {
1684 "No data about high/low rates. Increase rate\n");
1685 return RS_ACTION_UPSCALE;
1688 if ((high_tpt == IWL_INVALID_VALUE) &&
1689 (high != IWL_RATE_INVALID) &&
1690 (low_tpt != IWL_INVALID_VALUE) &&
1691 (low_tpt < current_tpt)) {
1693 "No data about high rate and low rate is worse. Increase rate\n");
1694 return RS_ACTION_UPSCALE;
1697 if ((high_tpt != IWL_INVALID_VALUE) &&
1698 (high_tpt > current_tpt)) {
1700 "Higher rate is better. Increate rate\n");
1701 return RS_ACTION_UPSCALE;
1704 if ((low_tpt != IWL_INVALID_VALUE) &&
1705 (high_tpt != IWL_INVALID_VALUE) &&
1706 (low_tpt < current_tpt) &&
1707 (high_tpt < current_tpt)) {
1709 "Both high and low are worse. Maintain rate\n");
1710 return RS_ACTION_STAY;
1713 if ((low_tpt != IWL_INVALID_VALUE) &&
1714 (low_tpt > current_tpt)) {
1716 "Lower rate is better\n");
1717 action = RS_ACTION_DOWNSCALE;
1721 if ((low_tpt == IWL_INVALID_VALUE) &&
1722 (low != IWL_RATE_INVALID)) {
1724 "No data about lower rate\n");
1725 action = RS_ACTION_DOWNSCALE;
1729 IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1732 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1733 if (sr >= RS_SR_NO_DECREASE) {
1735 "SR is above NO DECREASE. Avoid downscale\n");
1736 action = RS_ACTION_STAY;
1737 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1739 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1740 action = RS_ACTION_STAY;
1742 IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1749 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1750 int *weaker, int *stronger)
1752 *weaker = index + TPC_TX_POWER_STEP;
1753 if (*weaker > TPC_MAX_REDUCTION)
1754 *weaker = TPC_INVALID;
1756 *stronger = index - TPC_TX_POWER_STEP;
1758 *stronger = TPC_INVALID;
1761 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1762 struct rs_rate *rate, enum ieee80211_band band)
1764 int index = rate->index;
1765 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1766 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1769 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1770 cam, sta_ps_disabled);
1772 * allow tpc only if power management is enabled, or bt coex
1773 * activity grade allows it and we are on 2.4Ghz.
1775 if ((cam || sta_ps_disabled) &&
1776 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1779 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1780 if (is_legacy(rate))
1781 return index == IWL_RATE_54M_INDEX;
1783 return index == IWL_RATE_MCS_7_INDEX;
1785 return index == IWL_RATE_MCS_7_INDEX ||
1786 index == IWL_RATE_MCS_8_INDEX ||
1787 index == IWL_RATE_MCS_9_INDEX;
1795 TPC_ACTION_DECREASE,
1796 TPC_ACTION_INCREASE,
1797 TPC_ACTION_NO_RESTIRCTION,
1800 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1801 s32 sr, int weak, int strong,
1803 int weak_tpt, int strong_tpt)
1805 /* stay until we have valid tpt */
1806 if (current_tpt == IWL_INVALID_VALUE) {
1807 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1808 return TPC_ACTION_STAY;
1811 /* Too many failures, increase txp */
1812 if (sr <= TPC_SR_FORCE_INCREASE || current_tpt == 0) {
1813 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1814 return TPC_ACTION_NO_RESTIRCTION;
1817 /* try decreasing first if applicable */
1818 if (weak != TPC_INVALID) {
1819 if (weak_tpt == IWL_INVALID_VALUE &&
1820 (strong_tpt == IWL_INVALID_VALUE ||
1821 current_tpt >= strong_tpt)) {
1823 "no weak txp measurement. decrease txp\n");
1824 return TPC_ACTION_DECREASE;
1827 if (weak_tpt > current_tpt) {
1829 "lower txp has better tpt. decrease txp\n");
1830 return TPC_ACTION_DECREASE;
1834 /* next, increase if needed */
1835 if (sr < TPC_SR_NO_INCREASE && strong != TPC_INVALID) {
1836 if (weak_tpt == IWL_INVALID_VALUE &&
1837 strong_tpt != IWL_INVALID_VALUE &&
1838 current_tpt < strong_tpt) {
1840 "higher txp has better tpt. increase txp\n");
1841 return TPC_ACTION_INCREASE;
1844 if (weak_tpt < current_tpt &&
1845 (strong_tpt == IWL_INVALID_VALUE ||
1846 strong_tpt > current_tpt)) {
1848 "lower txp has worse tpt. increase txp\n");
1849 return TPC_ACTION_INCREASE;
1853 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1854 return TPC_ACTION_STAY;
1857 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1858 struct ieee80211_sta *sta,
1859 struct iwl_lq_sta *lq_sta,
1860 struct iwl_scale_tbl_info *tbl)
1862 struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
1863 struct ieee80211_vif *vif = mvm_sta->vif;
1864 struct ieee80211_chanctx_conf *chanctx_conf;
1865 enum ieee80211_band band;
1866 struct iwl_rate_scale_data *window;
1867 struct rs_rate *rate = &tbl->rate;
1868 enum tpc_action action;
1870 u8 cur = lq_sta->lq.reduced_tpc;
1873 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1875 #ifdef CONFIG_MAC80211_DEBUGFS
1876 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1877 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1878 lq_sta->pers.dbg_fixed_txp_reduction);
1879 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1880 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1885 chanctx_conf = rcu_dereference(vif->chanctx_conf);
1886 if (WARN_ON(!chanctx_conf))
1887 band = IEEE80211_NUM_BANDS;
1889 band = chanctx_conf->def.chan->band;
1892 if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1894 "tpc is not allowed. remove txp restrictions\n");
1895 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1896 return cur != TPC_NO_REDUCTION;
1899 rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1901 /* Collect measured throughputs for current and adjacent rates */
1902 window = tbl->tpc_win;
1903 sr = window[cur].success_ratio;
1904 current_tpt = window[cur].average_tpt;
1905 if (weak != TPC_INVALID)
1906 weak_tpt = window[weak].average_tpt;
1907 if (strong != TPC_INVALID)
1908 strong_tpt = window[strong].average_tpt;
1911 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1912 cur, current_tpt, sr, weak, strong,
1913 weak_tpt, strong_tpt);
1915 action = rs_get_tpc_action(mvm, sr, weak, strong,
1916 current_tpt, weak_tpt, strong_tpt);
1918 /* override actions if we are on the edge */
1919 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1920 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
1921 action = TPC_ACTION_STAY;
1922 } else if (strong == TPC_INVALID &&
1923 (action == TPC_ACTION_INCREASE ||
1924 action == TPC_ACTION_NO_RESTIRCTION)) {
1925 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
1926 action = TPC_ACTION_STAY;
1930 case TPC_ACTION_DECREASE:
1931 lq_sta->lq.reduced_tpc = weak;
1933 case TPC_ACTION_INCREASE:
1934 lq_sta->lq.reduced_tpc = strong;
1936 case TPC_ACTION_NO_RESTIRCTION:
1937 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1939 case TPC_ACTION_STAY:
1947 * Do rate scaling and search for new modulation mode.
1949 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1950 struct sk_buff *skb,
1951 struct ieee80211_sta *sta,
1952 struct iwl_lq_sta *lq_sta)
1954 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1955 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1956 int low = IWL_RATE_INVALID;
1957 int high = IWL_RATE_INVALID;
1959 struct iwl_rate_scale_data *window = NULL;
1960 int current_tpt = IWL_INVALID_VALUE;
1961 int low_tpt = IWL_INVALID_VALUE;
1962 int high_tpt = IWL_INVALID_VALUE;
1964 enum rs_action scale_action = RS_ACTION_STAY;
1967 struct iwl_scale_tbl_info *tbl, *tbl1;
1972 u8 tid = IWL_MAX_TID_COUNT;
1973 u8 prev_agg = lq_sta->is_agg;
1974 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1975 struct iwl_mvm_tid_data *tid_data;
1976 struct rs_rate *rate;
1978 /* Send management frames and NO_ACK data using lowest rate. */
1979 /* TODO: this could probably be improved.. */
1980 if (!ieee80211_is_data(hdr->frame_control) ||
1981 info->flags & IEEE80211_TX_CTL_NO_ACK)
1984 tid = rs_get_tid(lq_sta, hdr);
1985 if ((tid != IWL_MAX_TID_COUNT) &&
1986 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1987 tid_data = &sta_priv->tid_data[tid];
1988 if (tid_data->state == IWL_AGG_OFF)
1997 * Select rate-scale / modulation-mode table to work with in
1998 * the rest of this function: "search" if searching for better
1999 * modulation mode, or "active" if doing rate scaling within a mode.
2001 if (!lq_sta->search_better_tbl)
2002 active_tbl = lq_sta->active_tbl;
2004 active_tbl = 1 - lq_sta->active_tbl;
2006 tbl = &(lq_sta->lq_info[active_tbl]);
2009 if (prev_agg != lq_sta->is_agg) {
2011 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2012 prev_agg, lq_sta->is_agg);
2013 rs_set_expected_tpt_table(lq_sta, tbl);
2014 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2017 /* current tx rate */
2018 index = lq_sta->last_txrate_idx;
2020 /* rates available for this association, and for modulation mode */
2021 rate_mask = rs_get_supported_rates(lq_sta, rate);
2023 if (!(BIT(index) & rate_mask)) {
2024 IWL_ERR(mvm, "Current Rate is not valid\n");
2025 if (lq_sta->search_better_tbl) {
2026 /* revert to active table if search table is not valid*/
2027 rate->type = LQ_NONE;
2028 lq_sta->search_better_tbl = 0;
2029 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2030 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2035 /* Get expected throughput table and history window for current rate */
2036 if (!tbl->expected_tpt) {
2037 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2041 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2042 window = &(tbl->win[index]);
2045 * If there is not enough history to calculate actual average
2046 * throughput, keep analyzing results of more tx frames, without
2047 * changing rate or mode (bypass most of the rest of this function).
2048 * Set up new rate table in uCode only if old rate is not supported
2049 * in current association (use new rate found above).
2051 fail_count = window->counter - window->success_counter;
2052 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2053 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2055 "(%s: %d): Test Window: succ %d total %d\n",
2056 rs_pretty_lq_type(rate->type),
2057 index, window->success_counter, window->counter);
2059 /* Can't calculate this yet; not enough history */
2060 window->average_tpt = IWL_INVALID_VALUE;
2062 /* Should we stay with this modulation mode,
2063 * or search for a new one? */
2064 rs_stay_in_table(lq_sta, false);
2068 /* Else we have enough samples; calculate estimate of
2069 * actual average throughput */
2070 if (window->average_tpt != ((window->success_ratio *
2071 tbl->expected_tpt[index] + 64) / 128)) {
2072 window->average_tpt = ((window->success_ratio *
2073 tbl->expected_tpt[index] + 64) / 128);
2076 /* If we are searching for better modulation mode, check success. */
2077 if (lq_sta->search_better_tbl) {
2078 /* If good success, continue using the "search" mode;
2079 * no need to send new link quality command, since we're
2080 * continuing to use the setup that we've been trying. */
2081 if (window->average_tpt > lq_sta->last_tpt) {
2083 "SWITCHING TO NEW TABLE SR: %d "
2084 "cur-tpt %d old-tpt %d\n",
2085 window->success_ratio,
2086 window->average_tpt,
2089 /* Swap tables; "search" becomes "active" */
2090 lq_sta->active_tbl = active_tbl;
2091 current_tpt = window->average_tpt;
2092 /* Else poor success; go back to mode in "active" table */
2095 "GOING BACK TO THE OLD TABLE: SR %d "
2096 "cur-tpt %d old-tpt %d\n",
2097 window->success_ratio,
2098 window->average_tpt,
2101 /* Nullify "search" table */
2102 rate->type = LQ_NONE;
2104 /* Revert to "active" table */
2105 active_tbl = lq_sta->active_tbl;
2106 tbl = &(lq_sta->lq_info[active_tbl]);
2108 /* Revert to "active" rate and throughput info */
2109 index = tbl->rate.index;
2110 current_tpt = lq_sta->last_tpt;
2112 /* Need to set up a new rate table in uCode */
2116 /* Either way, we've made a decision; modulation mode
2117 * search is done, allow rate adjustment next time. */
2118 lq_sta->search_better_tbl = 0;
2119 done_search = 1; /* Don't switch modes below! */
2123 /* (Else) not in search of better modulation mode, try for better
2124 * starting rate, while staying in this mode. */
2125 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2126 low = high_low & 0xff;
2127 high = (high_low >> 8) & 0xff;
2129 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2131 sr = window->success_ratio;
2133 /* Collect measured throughputs for current and adjacent rates */
2134 current_tpt = window->average_tpt;
2135 if (low != IWL_RATE_INVALID)
2136 low_tpt = tbl->win[low].average_tpt;
2137 if (high != IWL_RATE_INVALID)
2138 high_tpt = tbl->win[high].average_tpt;
2141 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2142 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2143 low, high, low_tpt, high_tpt);
2145 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2146 current_tpt, low_tpt, high_tpt);
2148 /* Force a search in case BT doesn't like us being in MIMO */
2149 if (is_mimo(rate) &&
2150 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2152 "BT Coex forbids MIMO. Search for new config\n");
2153 rs_stay_in_table(lq_sta, true);
2157 switch (scale_action) {
2158 case RS_ACTION_DOWNSCALE:
2159 /* Decrease starting rate, update uCode's rate table */
2160 if (low != IWL_RATE_INVALID) {
2165 "At the bottom rate. Can't decrease\n");
2169 case RS_ACTION_UPSCALE:
2170 /* Increase starting rate, update uCode's rate table */
2171 if (high != IWL_RATE_INVALID) {
2176 "At the top rate. Can't increase\n");
2180 case RS_ACTION_STAY:
2182 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2183 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2190 /* Replace uCode's rate table for the destination station. */
2192 tbl->rate.index = index;
2193 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2196 rs_stay_in_table(lq_sta, false);
2199 * Search for new modulation mode if we're:
2200 * 1) Not changing rates right now
2201 * 2) Not just finishing up a search
2202 * 3) Allowing a new search
2204 if (!update_lq && !done_search &&
2205 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2206 && window->counter) {
2207 enum rs_column next_column;
2209 /* Save current throughput to compare with "search" throughput*/
2210 lq_sta->last_tpt = current_tpt;
2213 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2214 update_lq, done_search, lq_sta->rs_state,
2217 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2218 if (next_column != RS_COLUMN_INVALID) {
2219 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2222 lq_sta->search_better_tbl = 1;
2225 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2226 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2229 /* If new "search" mode was selected, set up in uCode table */
2230 if (lq_sta->search_better_tbl) {
2231 /* Access the "search" table, clear its history. */
2232 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2233 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2235 /* Use new "search" start rate */
2236 index = tbl->rate.index;
2238 rs_dump_rate(mvm, &tbl->rate,
2239 "Switch to SEARCH TABLE:");
2240 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2241 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2247 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2248 /* If the "active" (non-search) mode was legacy,
2249 * and we've tried switching antennas,
2250 * but we haven't been able to try HT modes (not available),
2251 * stay with best antenna legacy modulation for a while
2252 * before next round of mode comparisons. */
2253 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2254 if (is_legacy(&tbl1->rate)) {
2255 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2257 if (tid != IWL_MAX_TID_COUNT) {
2258 tid_data = &sta_priv->tid_data[tid];
2259 if (tid_data->state != IWL_AGG_OFF) {
2261 "Stop aggregation on tid %d\n",
2263 ieee80211_stop_tx_ba_session(sta, tid);
2266 rs_set_stay_in_table(mvm, 1, lq_sta);
2268 /* If we're in an HT mode, and all 3 mode switch actions
2269 * have been tried and compared, stay in this best modulation
2270 * mode for a while before next round of mode comparisons. */
2271 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2272 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2273 (tid != IWL_MAX_TID_COUNT)) {
2274 tid_data = &sta_priv->tid_data[tid];
2275 if (tid_data->state == IWL_AGG_OFF) {
2277 "try to aggregate tid %d\n",
2279 rs_tl_turn_on_agg(mvm, tid,
2283 rs_set_stay_in_table(mvm, 0, lq_sta);
2288 lq_sta->last_txrate_idx = index;
2292 * rs_initialize_lq - Initialize a station's hardware rate table
2294 * The uCode's station table contains a table of fallback rates
2295 * for automatic fallback during transmission.
2297 * NOTE: This sets up a default set of values. These will be replaced later
2298 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2301 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2302 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2303 * which requires station table entry to exist).
2305 static void rs_initialize_lq(struct iwl_mvm *mvm,
2306 struct ieee80211_sta *sta,
2307 struct iwl_lq_sta *lq_sta,
2308 enum ieee80211_band band,
2311 struct iwl_scale_tbl_info *tbl;
2312 struct rs_rate *rate;
2317 if (!sta || !lq_sta)
2320 i = lq_sta->last_txrate_idx;
2322 valid_tx_ant = mvm->fw->valid_tx_ant;
2324 if (!lq_sta->search_better_tbl)
2325 active_tbl = lq_sta->active_tbl;
2327 active_tbl = 1 - lq_sta->active_tbl;
2329 tbl = &(lq_sta->lq_info[active_tbl]);
2332 if ((i < 0) || (i >= IWL_RATE_COUNT))
2336 rate->ant = first_antenna(valid_tx_ant);
2339 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2340 if (band == IEEE80211_BAND_5GHZ)
2341 rate->type = LQ_LEGACY_A;
2343 rate->type = LQ_LEGACY_G;
2345 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2346 if (rate->ant == ANT_A)
2347 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2349 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2351 rs_set_expected_tpt_table(lq_sta, tbl);
2352 rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2353 /* TODO restore station should remember the lq cmd */
2354 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2357 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2358 struct ieee80211_tx_rate_control *txrc)
2360 struct sk_buff *skb = txrc->skb;
2361 struct iwl_op_mode *op_mode __maybe_unused =
2362 (struct iwl_op_mode *)mvm_r;
2363 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2364 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2365 struct iwl_lq_sta *lq_sta = mvm_sta;
2367 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2369 /* Treat uninitialized rate scaling data same as non-existing. */
2370 if (lq_sta && !lq_sta->pers.drv) {
2371 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2375 /* Send management frames and NO_ACK data using lowest rate. */
2376 if (rate_control_send_low(sta, mvm_sta, txrc))
2379 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2380 info->band, &info->control.rates[0]);
2382 info->control.rates[0].count = 1;
2385 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2388 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2389 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2390 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2391 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2393 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2395 lq_sta->pers.drv = mvm;
2396 #ifdef CONFIG_MAC80211_DEBUGFS
2397 lq_sta->pers.dbg_fixed_rate = 0;
2398 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2401 return &sta_priv->lq_sta;
2404 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2407 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2408 (0x3 << (2 * (nss - 1)));
2409 rx_mcs >>= (2 * (nss - 1));
2411 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2412 return IWL_RATE_MCS_7_INDEX;
2413 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2414 return IWL_RATE_MCS_8_INDEX;
2415 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2416 return IWL_RATE_MCS_9_INDEX;
2418 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2422 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2423 struct ieee80211_sta_vht_cap *vht_cap,
2424 struct iwl_lq_sta *lq_sta)
2427 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2429 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2430 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2431 if (i == IWL_RATE_9M_INDEX)
2434 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2435 if (i == IWL_RATE_MCS_9_INDEX &&
2436 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2439 lq_sta->active_siso_rate |= BIT(i);
2443 if (sta->rx_nss < 2)
2446 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2447 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2448 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2449 if (i == IWL_RATE_9M_INDEX)
2452 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2453 if (i == IWL_RATE_MCS_9_INDEX &&
2454 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2457 lq_sta->active_mimo2_rate |= BIT(i);
2462 #ifdef CONFIG_IWLWIFI_DEBUGFS
2463 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2464 struct iwl_mvm_frame_stats *stats)
2466 spin_lock_bh(&mvm->drv_stats_lock);
2467 memset(stats, 0, sizeof(*stats));
2468 spin_unlock_bh(&mvm->drv_stats_lock);
2471 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2472 struct iwl_mvm_frame_stats *stats,
2475 u8 nss = 0, mcs = 0;
2477 spin_lock(&mvm->drv_stats_lock);
2480 stats->agg_frames++;
2482 stats->success_frames++;
2484 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2485 case RATE_MCS_CHAN_WIDTH_20:
2486 stats->bw_20_frames++;
2488 case RATE_MCS_CHAN_WIDTH_40:
2489 stats->bw_40_frames++;
2491 case RATE_MCS_CHAN_WIDTH_80:
2492 stats->bw_80_frames++;
2495 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2498 if (rate & RATE_MCS_HT_MSK) {
2500 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2501 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2502 } else if (rate & RATE_MCS_VHT_MSK) {
2503 stats->vht_frames++;
2504 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2505 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2506 RATE_VHT_MCS_NSS_POS) + 1;
2508 stats->legacy_frames++;
2512 stats->siso_frames++;
2514 stats->mimo2_frames++;
2516 if (rate & RATE_MCS_SGI_MSK)
2517 stats->sgi_frames++;
2519 stats->ngi_frames++;
2521 stats->last_rates[stats->last_frame_idx] = rate;
2522 stats->last_frame_idx = (stats->last_frame_idx + 1) %
2523 ARRAY_SIZE(stats->last_rates);
2525 spin_unlock(&mvm->drv_stats_lock);
2530 * Called after adding a new station to initialize rate scaling
2532 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2533 enum ieee80211_band band, bool init)
2536 struct ieee80211_hw *hw = mvm->hw;
2537 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2538 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2539 struct iwl_mvm_sta *sta_priv;
2540 struct iwl_lq_sta *lq_sta;
2541 struct ieee80211_supported_band *sband;
2542 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2544 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2545 lq_sta = &sta_priv->lq_sta;
2547 /* clear all non-persistent lq data */
2548 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2550 sband = hw->wiphy->bands[band];
2552 lq_sta->lq.sta_id = sta_priv->sta_id;
2554 for (j = 0; j < LQ_SIZE; j++)
2555 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2557 lq_sta->flush_timer = 0;
2558 lq_sta->last_tx = jiffies;
2561 "LQ: *** rate scale station global init for station %d ***\n",
2563 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2564 * the lowest or the highest rate.. Could consider using RSSI from
2565 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2568 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2569 lq_sta->band = sband->band;
2571 * active legacy rates as per supported rates bitmap
2573 supp = sta->supp_rates[sband->band];
2574 lq_sta->active_legacy_rate = 0;
2575 for_each_set_bit(i, &supp, BITS_PER_LONG)
2576 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2578 /* TODO: should probably account for rx_highest for both HT/VHT */
2579 if (!vht_cap || !vht_cap->vht_supported) {
2580 /* active_siso_rate mask includes 9 MBits (bit 5),
2581 * and CCK (bits 0-3), supp_rates[] does not;
2582 * shift to convert format, force 9 MBits off.
2584 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2585 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2586 lq_sta->active_siso_rate &= ~((u16)0x2);
2587 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2590 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2591 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2592 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2593 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2595 lq_sta->is_vht = false;
2596 if (mvm->cfg->ht_params->ldpc &&
2597 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2598 lq_sta->ldpc = true;
2600 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2601 lq_sta->is_vht = true;
2603 if (mvm->cfg->ht_params->ldpc &&
2604 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2605 lq_sta->ldpc = true;
2608 lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate,
2610 lq_sta->max_siso_rate_idx = find_last_bit(&lq_sta->active_siso_rate,
2612 lq_sta->max_mimo2_rate_idx = find_last_bit(&lq_sta->active_mimo2_rate,
2616 "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d\n",
2617 lq_sta->active_legacy_rate,
2618 lq_sta->active_siso_rate,
2619 lq_sta->active_mimo2_rate,
2620 lq_sta->is_vht, lq_sta->ldpc);
2621 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2622 lq_sta->max_legacy_rate_idx,
2623 lq_sta->max_siso_rate_idx,
2624 lq_sta->max_mimo2_rate_idx);
2626 /* These values will be overridden later */
2627 lq_sta->lq.single_stream_ant_msk =
2628 first_antenna(mvm->fw->valid_tx_ant);
2629 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2631 /* as default allow aggregation for all tids */
2632 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2634 /* Set last_txrate_idx to lowest rate */
2635 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2636 if (sband->band == IEEE80211_BAND_5GHZ)
2637 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2639 #ifdef CONFIG_IWLWIFI_DEBUGFS
2640 iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2642 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2645 static void rs_rate_update(void *mvm_r,
2646 struct ieee80211_supported_band *sband,
2647 struct cfg80211_chan_def *chandef,
2648 struct ieee80211_sta *sta, void *priv_sta,
2652 struct iwl_op_mode *op_mode =
2653 (struct iwl_op_mode *)mvm_r;
2654 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2656 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2657 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2658 ieee80211_stop_tx_ba_session(sta, tid);
2660 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2663 #ifdef CONFIG_MAC80211_DEBUGFS
2664 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2665 struct iwl_lq_cmd *lq_cmd,
2666 enum ieee80211_band band,
2669 struct rs_rate rate;
2671 int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2672 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2673 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2675 for (i = 0; i < num_rates; i++)
2676 lq_cmd->rs_table[i] = ucode_rate_le32;
2678 rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2681 lq_cmd->mimo_delim = num_rates - 1;
2683 lq_cmd->mimo_delim = 0;
2685 lq_cmd->reduced_tpc = 0;
2687 if (num_of_ant(ant) == 1)
2688 lq_cmd->single_stream_ant_msk = ant;
2690 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2692 #endif /* CONFIG_MAC80211_DEBUGFS */
2694 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2695 struct iwl_lq_sta *lq_sta,
2696 struct rs_rate *rate,
2697 __le32 *rs_table, int *rs_table_index,
2698 int num_rates, int num_retries,
2699 u8 valid_tx_ant, bool toggle_ant)
2703 bool bottom_reached = false;
2704 int prev_rate_idx = rate->index;
2705 int end = LINK_QUAL_MAX_RETRY_NUM;
2706 int index = *rs_table_index;
2708 for (i = 0; i < num_rates && index < end; i++) {
2709 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2710 for (j = 0; j < num_retries && index < end; j++, index++)
2711 rs_table[index] = ucode_rate;
2714 rs_toggle_antenna(valid_tx_ant, rate);
2716 prev_rate_idx = rate->index;
2717 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2718 if (bottom_reached && !is_legacy(rate))
2722 if (!bottom_reached)
2723 rate->index = prev_rate_idx;
2725 *rs_table_index = index;
2728 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2729 * column the rate table should look like this:
2731 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2732 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2733 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2734 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2735 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2736 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2737 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2738 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2739 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2740 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2741 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2742 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2743 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2744 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2745 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2746 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2748 static void rs_build_rates_table(struct iwl_mvm *mvm,
2749 struct iwl_lq_sta *lq_sta,
2750 const struct rs_rate *initial_rate)
2752 struct rs_rate rate;
2753 int num_rates, num_retries, index = 0;
2754 u8 valid_tx_ant = 0;
2755 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2756 bool toggle_ant = false;
2758 memcpy(&rate, initial_rate, sizeof(rate));
2760 valid_tx_ant = mvm->fw->valid_tx_ant;
2762 if (is_siso(&rate)) {
2763 num_rates = RS_INITIAL_SISO_NUM_RATES;
2764 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2765 } else if (is_mimo(&rate)) {
2766 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2767 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2769 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2770 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2774 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2775 num_rates, num_retries, valid_tx_ant,
2778 rs_get_lower_rate_down_column(lq_sta, &rate);
2780 if (is_siso(&rate)) {
2781 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2782 num_retries = RS_SECONDARY_SISO_RETRIES;
2783 lq_cmd->mimo_delim = index;
2784 } else if (is_legacy(&rate)) {
2785 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2786 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2793 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2794 num_rates, num_retries, valid_tx_ant,
2797 rs_get_lower_rate_down_column(lq_sta, &rate);
2799 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2800 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2802 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2803 num_rates, num_retries, valid_tx_ant,
2808 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2809 struct ieee80211_sta *sta,
2810 struct iwl_lq_sta *lq_sta,
2811 const struct rs_rate *initial_rate)
2813 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2814 struct iwl_mvm_sta *mvmsta;
2815 struct iwl_mvm_vif *mvmvif;
2817 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2818 lq_cmd->agg_time_limit =
2819 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2821 #ifdef CONFIG_MAC80211_DEBUGFS
2822 if (lq_sta->pers.dbg_fixed_rate) {
2823 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2825 lq_sta->pers.dbg_fixed_rate);
2829 if (WARN_ON_ONCE(!sta || !initial_rate))
2832 rs_build_rates_table(mvm, lq_sta, initial_rate);
2834 if (num_of_ant(initial_rate->ant) == 1)
2835 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2837 mvmsta = iwl_mvm_sta_from_mac80211(sta);
2838 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
2840 if (num_of_ant(initial_rate->ant) == 1)
2841 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2843 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
2846 * In case of low latency, tell the firwmare to leave a frame in the
2847 * Tx Fifo so that it can start a transaction in the same TxOP. This
2848 * basically allows the firmware to send bursts.
2850 if (iwl_mvm_vif_low_latency(mvmvif)) {
2851 lq_cmd->agg_frame_cnt_limit--;
2853 if (mvm->low_latency_agg_frame_limit)
2854 lq_cmd->agg_frame_cnt_limit =
2855 min(lq_cmd->agg_frame_cnt_limit,
2856 mvm->low_latency_agg_frame_limit);
2859 if (mvmsta->vif->p2p)
2860 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
2862 lq_cmd->agg_time_limit =
2863 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
2866 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2870 /* rate scale requires free function to be implemented */
2871 static void rs_free(void *mvm_rate)
2876 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2879 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2880 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2882 IWL_DEBUG_RATE(mvm, "enter\n");
2883 IWL_DEBUG_RATE(mvm, "leave\n");
2886 #ifdef CONFIG_MAC80211_DEBUGFS
2887 int rs_pretty_print_rate(char *buf, const u32 rate)
2891 u8 mcs = 0, nss = 0;
2892 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2894 if (!(rate & RATE_MCS_HT_MSK) &&
2895 !(rate & RATE_MCS_VHT_MSK)) {
2896 int index = iwl_hwrate_to_plcp_idx(rate);
2898 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2900 index == IWL_RATE_INVALID ? "BAD" :
2901 iwl_rate_mcs[index].mbps);
2904 if (rate & RATE_MCS_VHT_MSK) {
2906 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2907 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2908 >> RATE_VHT_MCS_NSS_POS) + 1;
2909 } else if (rate & RATE_MCS_HT_MSK) {
2911 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2913 type = "Unknown"; /* shouldn't happen */
2916 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2917 case RATE_MCS_CHAN_WIDTH_20:
2920 case RATE_MCS_CHAN_WIDTH_40:
2923 case RATE_MCS_CHAN_WIDTH_80:
2926 case RATE_MCS_CHAN_WIDTH_160:
2933 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2934 type, rs_pretty_ant(ant), bw, mcs, nss,
2935 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2936 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
2937 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2938 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2939 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2943 * Program the device to use fixed rate for frame transmit
2944 * This is for debugging/testing only
2945 * once the device start use fixed rate, we need to reload the module
2946 * to being back the normal operation.
2948 static void rs_program_fix_rate(struct iwl_mvm *mvm,
2949 struct iwl_lq_sta *lq_sta)
2951 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2952 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2953 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2955 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
2956 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
2958 if (lq_sta->pers.dbg_fixed_rate) {
2959 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
2960 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
2964 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2965 const char __user *user_buf, size_t count, loff_t *ppos)
2967 struct iwl_lq_sta *lq_sta = file->private_data;
2968 struct iwl_mvm *mvm;
2973 mvm = lq_sta->pers.drv;
2974 memset(buf, 0, sizeof(buf));
2975 buf_size = min(count, sizeof(buf) - 1);
2976 if (copy_from_user(buf, user_buf, buf_size))
2979 if (sscanf(buf, "%x", &parsed_rate) == 1)
2980 lq_sta->pers.dbg_fixed_rate = parsed_rate;
2982 lq_sta->pers.dbg_fixed_rate = 0;
2984 rs_program_fix_rate(mvm, lq_sta);
2989 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2990 char __user *user_buf, size_t count, loff_t *ppos)
2997 struct iwl_lq_sta *lq_sta = file->private_data;
2998 struct iwl_mvm *mvm;
2999 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3000 struct rs_rate *rate = &tbl->rate;
3001 mvm = lq_sta->pers.drv;
3002 buff = kmalloc(2048, GFP_KERNEL);
3006 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3007 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3008 lq_sta->total_failed, lq_sta->total_success,
3009 lq_sta->active_legacy_rate);
3010 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3011 lq_sta->pers.dbg_fixed_rate);
3012 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3013 (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3014 (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3015 (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3016 desc += sprintf(buff+desc, "lq type %s\n",
3017 (is_legacy(rate)) ? "legacy" :
3018 is_vht(rate) ? "VHT" : "HT");
3019 if (!is_legacy(rate)) {
3020 desc += sprintf(buff+desc, " %s",
3021 (is_siso(rate)) ? "SISO" : "MIMO2");
3022 desc += sprintf(buff+desc, " %s",
3023 (is_ht20(rate)) ? "20MHz" :
3024 (is_ht40(rate)) ? "40MHz" :
3025 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3026 desc += sprintf(buff+desc, " %s %s %s\n",
3027 (rate->sgi) ? "SGI" : "NGI",
3028 (rate->ldpc) ? "LDPC" : "BCC",
3029 (lq_sta->is_agg) ? "AGG on" : "");
3031 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3032 lq_sta->last_rate_n_flags);
3033 desc += sprintf(buff+desc,
3034 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3036 lq_sta->lq.mimo_delim,
3037 lq_sta->lq.single_stream_ant_msk,
3038 lq_sta->lq.dual_stream_ant_msk);
3040 desc += sprintf(buff+desc,
3041 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3042 le16_to_cpu(lq_sta->lq.agg_time_limit),
3043 lq_sta->lq.agg_disable_start_th,
3044 lq_sta->lq.agg_frame_cnt_limit);
3046 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3047 desc += sprintf(buff+desc,
3048 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3049 lq_sta->lq.initial_rate_index[0],
3050 lq_sta->lq.initial_rate_index[1],
3051 lq_sta->lq.initial_rate_index[2],
3052 lq_sta->lq.initial_rate_index[3]);
3054 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3055 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3057 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3058 desc += rs_pretty_print_rate(buff+desc, r);
3061 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3066 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3067 .write = rs_sta_dbgfs_scale_table_write,
3068 .read = rs_sta_dbgfs_scale_table_read,
3069 .open = simple_open,
3070 .llseek = default_llseek,
3072 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3073 char __user *user_buf, size_t count, loff_t *ppos)
3079 struct iwl_scale_tbl_info *tbl;
3080 struct rs_rate *rate;
3081 struct iwl_lq_sta *lq_sta = file->private_data;
3083 buff = kmalloc(1024, GFP_KERNEL);
3087 for (i = 0; i < LQ_SIZE; i++) {
3088 tbl = &(lq_sta->lq_info[i]);
3090 desc += sprintf(buff+desc,
3091 "%s type=%d SGI=%d BW=%s DUP=0\n"
3093 lq_sta->active_tbl == i ? "*" : "x",
3096 is_ht20(rate) ? "20Mhz" :
3097 is_ht40(rate) ? "40Mhz" :
3098 is_ht80(rate) ? "80Mhz" : "ERR",
3100 for (j = 0; j < IWL_RATE_COUNT; j++) {
3101 desc += sprintf(buff+desc,
3102 "counter=%d success=%d %%=%d\n",
3103 tbl->win[j].counter,
3104 tbl->win[j].success_counter,
3105 tbl->win[j].success_ratio);
3108 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3113 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3114 .read = rs_sta_dbgfs_stats_table_read,
3115 .open = simple_open,
3116 .llseek = default_llseek,
3119 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3120 char __user *user_buf,
3121 size_t count, loff_t *ppos)
3123 static const char * const column_name[] = {
3124 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3125 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3126 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3127 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3128 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3129 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3130 [RS_COLUMN_MIMO2] = "MIMO2",
3131 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3134 static const char * const rate_name[] = {
3135 [IWL_RATE_1M_INDEX] = "1M",
3136 [IWL_RATE_2M_INDEX] = "2M",
3137 [IWL_RATE_5M_INDEX] = "5.5M",
3138 [IWL_RATE_11M_INDEX] = "11M",
3139 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3140 [IWL_RATE_9M_INDEX] = "9M",
3141 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3142 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3143 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3144 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3145 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3146 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3147 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3148 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3149 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3152 char *buff, *pos, *endpos;
3155 struct iwl_lq_sta *lq_sta = file->private_data;
3156 struct rs_rate_stats *stats;
3157 static const size_t bufsz = 1024;
3159 buff = kmalloc(bufsz, GFP_KERNEL);
3164 endpos = pos + bufsz;
3166 pos += scnprintf(pos, endpos - pos, "COLUMN,");
3167 for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3168 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3169 pos += scnprintf(pos, endpos - pos, "\n");
3171 for (col = 0; col < RS_COLUMN_COUNT; col++) {
3172 pos += scnprintf(pos, endpos - pos,
3173 "%s,", column_name[col]);
3175 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3176 stats = &(lq_sta->pers.tx_stats[col][rate]);
3177 pos += scnprintf(pos, endpos - pos,
3182 pos += scnprintf(pos, endpos - pos, "\n");
3185 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3190 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3191 const char __user *user_buf,
3192 size_t count, loff_t *ppos)
3194 struct iwl_lq_sta *lq_sta = file->private_data;
3195 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3200 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3201 .read = rs_sta_dbgfs_drv_tx_stats_read,
3202 .write = rs_sta_dbgfs_drv_tx_stats_write,
3203 .open = simple_open,
3204 .llseek = default_llseek,
3207 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3209 struct iwl_lq_sta *lq_sta = mvm_sta;
3210 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3211 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3212 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3213 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3214 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3215 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3216 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3217 &lq_sta->tx_agg_tid_en);
3218 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3219 &lq_sta->pers.dbg_fixed_txp_reduction);
3222 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3228 * Initialization of rate scaling information is done by driver after
3229 * the station is added. Since mac80211 calls this function before a
3230 * station is added we ignore it.
3232 static void rs_rate_init_stub(void *mvm_r,
3233 struct ieee80211_supported_band *sband,
3234 struct cfg80211_chan_def *chandef,
3235 struct ieee80211_sta *sta, void *mvm_sta)
3239 static const struct rate_control_ops rs_mvm_ops = {
3241 .tx_status = rs_tx_status,
3242 .get_rate = rs_get_rate,
3243 .rate_init = rs_rate_init_stub,
3246 .alloc_sta = rs_alloc_sta,
3247 .free_sta = rs_free_sta,
3248 .rate_update = rs_rate_update,
3249 #ifdef CONFIG_MAC80211_DEBUGFS
3250 .add_sta_debugfs = rs_add_debugfs,
3251 .remove_sta_debugfs = rs_remove_debugfs,
3255 int iwl_mvm_rate_control_register(void)
3257 return ieee80211_rate_control_register(&rs_mvm_ops);
3260 void iwl_mvm_rate_control_unregister(void)
3262 ieee80211_rate_control_unregister(&rs_mvm_ops);
3266 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3267 * Tx protection, according to this rquest and previous requests,
3268 * and send the LQ command.
3269 * @mvmsta: The station
3270 * @enable: Enable Tx protection?
3272 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3275 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3277 lockdep_assert_held(&mvm->mutex);
3280 if (mvmsta->tx_protection == 0)
3281 lq->flags |= LQ_FLAG_USE_RTS_MSK;
3282 mvmsta->tx_protection++;
3284 mvmsta->tx_protection--;
3285 if (mvmsta->tx_protection == 0)
3286 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3289 return iwl_mvm_send_lq_cmd(mvm, lq, false);