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);
358 static const char *rs_pretty_lq_type(enum iwl_table_type type);
359 static const char *rs_pretty_ant(u8 ant);
361 #ifdef CONFIG_MAC80211_DEBUGFS
362 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
365 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
371 * The following tables contain the expected throughput metrics for all rates
373 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
375 * where invalid entries are zeros.
377 * CCK rates are only valid in legacy table and will only be used in G
381 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
382 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
385 /* Expected TpT tables. 4 indexes:
386 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
388 static s32 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
389 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
390 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
391 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
392 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
395 static s32 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
396 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
397 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
398 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
399 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
402 static s32 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
403 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
404 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
405 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
406 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
409 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
410 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
411 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
412 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
413 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
416 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
417 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
418 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
419 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
420 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
423 static s32 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
424 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
425 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
426 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
427 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
431 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
440 { "24", "16QAM 1/2"},
441 { "36", "16QAM 3/4"},
442 { "48", "64QAM 2/3"},
443 { "54", "64QAM 3/4"},
444 { "60", "64QAM 5/6"},
447 #define MCS_INDEX_PER_STREAM (8)
449 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
452 IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
453 prefix, rs_pretty_lq_type(rate->type),
454 rate->index, rs_pretty_ant(rate->ant),
455 rate->bw, rate->sgi);
458 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
461 window->success_counter = 0;
462 window->success_ratio = IWL_INVALID_VALUE;
464 window->average_tpt = IWL_INVALID_VALUE;
467 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
469 return (ant_type & valid_antenna) == ant_type;
472 #ifdef CONFIG_MAC80211_DEBUGFS
474 * Program the device to use fixed rate for frame transmit
475 * This is for debugging/testing only
476 * once the device start use fixed rate, we need to reload the module
477 * to being back the normal operation.
479 static void rs_program_fix_rate(struct iwl_mvm *mvm,
480 struct iwl_lq_sta *lq_sta)
482 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
483 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
484 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
486 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
487 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
489 if (lq_sta->dbg_fixed_rate) {
490 rs_fill_link_cmd(NULL, NULL, lq_sta, lq_sta->dbg_fixed_rate);
491 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
496 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
497 struct iwl_lq_sta *lq_data, u8 tid,
498 struct ieee80211_sta *sta)
502 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
504 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
505 if (ret == -EAGAIN) {
507 * driver and mac80211 is out of sync
508 * this might be cause by reloading firmware
509 * stop the tx ba session here
511 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
513 ieee80211_stop_tx_ba_session(sta, tid);
518 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
519 struct iwl_lq_sta *lq_data,
520 struct ieee80211_sta *sta)
522 if (tid < IWL_MAX_TID_COUNT)
523 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
525 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
526 tid, IWL_MAX_TID_COUNT);
529 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
531 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
532 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
533 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
537 * Static function to get the expected throughput from an iwl_scale_tbl_info
538 * that wraps a NULL pointer check
540 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
542 if (tbl->expected_tpt)
543 return tbl->expected_tpt[rs_index];
548 * rs_collect_tx_data - Update the success/failure sliding window
550 * We keep a sliding window of the last 62 packets transmitted
551 * at this rate. window->data contains the bitmask of successful
554 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
555 int scale_index, int attempts, int successes)
557 struct iwl_rate_scale_data *window = NULL;
558 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
561 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
564 /* Select window for current tx bit rate */
565 window = &(tbl->win[scale_index]);
567 /* Get expected throughput */
568 tpt = get_expected_tpt(tbl, scale_index);
571 * Keep track of only the latest 62 tx frame attempts in this rate's
572 * history window; anything older isn't really relevant any more.
573 * If we have filled up the sliding window, drop the oldest attempt;
574 * if the oldest attempt (highest bit in bitmap) shows "success",
575 * subtract "1" from the success counter (this is the main reason
576 * we keep these bitmaps!).
578 while (attempts > 0) {
579 if (window->counter >= IWL_RATE_MAX_WINDOW) {
580 /* remove earliest */
581 window->counter = IWL_RATE_MAX_WINDOW - 1;
583 if (window->data & mask) {
584 window->data &= ~mask;
585 window->success_counter--;
589 /* Increment frames-attempted counter */
592 /* Shift bitmap by one frame to throw away oldest history */
595 /* Mark the most recent #successes attempts as successful */
597 window->success_counter++;
605 /* Calculate current success ratio, avoid divide-by-0! */
606 if (window->counter > 0)
607 window->success_ratio = 128 * (100 * window->success_counter)
610 window->success_ratio = IWL_INVALID_VALUE;
612 fail_count = window->counter - window->success_counter;
614 /* Calculate average throughput, if we have enough history. */
615 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
616 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
617 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
619 window->average_tpt = IWL_INVALID_VALUE;
624 /* Convert rs_rate object into ucode rate bitmask */
625 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
626 struct rs_rate *rate)
629 int index = rate->index;
631 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
632 RATE_MCS_ANT_ABC_MSK);
634 if (is_legacy(rate)) {
635 ucode_rate |= iwl_rates[index].plcp;
636 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
637 ucode_rate |= RATE_MCS_CCK_MSK;
642 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
643 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
644 index = IWL_LAST_HT_RATE;
646 ucode_rate |= RATE_MCS_HT_MSK;
648 if (is_ht_siso(rate))
649 ucode_rate |= iwl_rates[index].plcp_ht_siso;
650 else if (is_ht_mimo2(rate))
651 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
654 } else if (is_vht(rate)) {
655 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
656 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
657 index = IWL_LAST_VHT_RATE;
659 ucode_rate |= RATE_MCS_VHT_MSK;
660 if (is_vht_siso(rate))
661 ucode_rate |= iwl_rates[index].plcp_vht_siso;
662 else if (is_vht_mimo2(rate))
663 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
668 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
671 ucode_rate |= rate->bw;
673 ucode_rate |= RATE_MCS_SGI_MSK;
678 /* Convert a ucode rate into an rs_rate object */
679 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
680 enum ieee80211_band band,
681 struct rs_rate *rate)
683 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
684 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
687 memset(rate, 0, sizeof(struct rs_rate));
688 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
690 if (rate->index == IWL_RATE_INVALID) {
695 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
698 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
699 !(ucode_rate & RATE_MCS_VHT_MSK)) {
700 if (num_of_ant == 1) {
701 if (band == IEEE80211_BAND_5GHZ)
702 rate->type = LQ_LEGACY_A;
704 rate->type = LQ_LEGACY_G;
711 if (ucode_rate & RATE_MCS_SGI_MSK)
714 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
716 if (ucode_rate & RATE_MCS_HT_MSK) {
717 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
718 RATE_HT_MCS_NSS_POS) + 1;
721 rate->type = LQ_HT_SISO;
722 WARN_ON_ONCE(num_of_ant != 1);
723 } else if (nss == 2) {
724 rate->type = LQ_HT_MIMO2;
725 WARN_ON_ONCE(num_of_ant != 2);
729 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
730 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
731 RATE_VHT_MCS_NSS_POS) + 1;
734 rate->type = LQ_VHT_SISO;
735 WARN_ON_ONCE(num_of_ant != 1);
736 } else if (nss == 2) {
737 rate->type = LQ_VHT_MIMO2;
738 WARN_ON_ONCE(num_of_ant != 2);
744 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
745 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
751 /* switch to another antenna/antennas and return 1 */
752 /* if no other valid antenna found, return 0 */
753 static int rs_toggle_antenna(u32 valid_ant, u32 *ucode_rate,
754 struct rs_rate *rate)
758 if (!rate->ant || rate->ant > ANT_ABC)
761 if (!rs_is_valid_ant(valid_ant, rate->ant))
764 new_ant_type = ant_toggle_lookup[rate->ant];
766 while ((new_ant_type != rate->ant) &&
767 !rs_is_valid_ant(valid_ant, new_ant_type))
768 new_ant_type = ant_toggle_lookup[new_ant_type];
770 if (new_ant_type == rate->ant)
773 rate->ant = new_ant_type;
775 /* TODO: get rid of ucode_rate here. This should handle only rs_rate */
776 *ucode_rate &= ~RATE_MCS_ANT_ABC_MSK;
777 *ucode_rate |= new_ant_type << RATE_MCS_ANT_POS;
781 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
782 struct rs_rate *rate)
785 return lq_sta->active_legacy_rate;
786 else if (is_siso(rate))
787 return lq_sta->active_siso_rate;
788 else if (is_mimo2(rate))
789 return lq_sta->active_mimo2_rate;
795 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
798 u8 high = IWL_RATE_INVALID;
799 u8 low = IWL_RATE_INVALID;
801 /* 802.11A or ht walks to the next literal adjacent rate in
803 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
807 /* Find the previous rate that is in the rate mask */
809 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
810 if (rate_mask & mask) {
816 /* Find the next rate that is in the rate mask */
818 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
819 if (rate_mask & mask) {
825 return (high << 8) | low;
829 while (low != IWL_RATE_INVALID) {
830 low = iwl_rates[low].prev_rs;
831 if (low == IWL_RATE_INVALID)
833 if (rate_mask & (1 << low))
835 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
839 while (high != IWL_RATE_INVALID) {
840 high = iwl_rates[high].next_rs;
841 if (high == IWL_RATE_INVALID)
843 if (rate_mask & (1 << high))
845 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
848 return (high << 8) | low;
851 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
852 struct rs_rate *rate,
853 u8 scale_index, u8 ht_possible)
858 u8 switch_to_legacy = 0;
859 struct iwl_mvm *mvm = lq_sta->drv;
861 /* check if we need to switch from HT to legacy rates.
862 * assumption is that mandatory rates (1Mbps or 6Mbps)
863 * are always supported (spec demand) */
864 if (!is_legacy(rate) && (!ht_possible || !scale_index)) {
865 switch_to_legacy = 1;
866 WARN_ON_ONCE(scale_index < IWL_RATE_MCS_0_INDEX &&
867 scale_index > IWL_RATE_MCS_9_INDEX);
868 scale_index = rs_ht_to_legacy[scale_index];
869 if (lq_sta->band == IEEE80211_BAND_5GHZ)
870 rate->type = LQ_LEGACY_A;
872 rate->type = LQ_LEGACY_G;
874 if (num_of_ant(rate->ant) > 1)
876 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
878 rate->bw = RATE_MCS_CHAN_WIDTH_20;
882 rate_mask = rs_get_supported_rates(lq_sta, rate);
884 /* Mask with station rate restriction */
885 if (is_legacy(rate)) {
886 /* supp_rates has no CCK bits in A mode */
887 if (lq_sta->band == IEEE80211_BAND_5GHZ)
888 rate_mask = (u16)(rate_mask &
889 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
891 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
894 /* If we switched from HT to legacy, check current rate */
895 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
900 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
902 low = high_low & 0xff;
904 if (low == IWL_RATE_INVALID)
909 return ucode_rate_from_rs_rate(lq_sta->drv, rate);
912 /* Simple function to compare two rate scale table types */
913 static inline bool rs_rate_match(struct rs_rate *a,
916 return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
919 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
921 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
922 return RATE_MCS_CHAN_WIDTH_40;
923 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
924 return RATE_MCS_CHAN_WIDTH_80;
925 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
926 return RATE_MCS_CHAN_WIDTH_160;
928 return RATE_MCS_CHAN_WIDTH_20;
932 * mac80211 sends us Tx status
934 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
935 struct ieee80211_sta *sta, void *priv_sta,
941 struct iwl_lq_sta *lq_sta = priv_sta;
942 struct iwl_lq_cmd *table;
943 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
944 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
945 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
946 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
947 enum mac80211_rate_control_flags mac_flags;
950 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
952 /* Treat uninitialized rate scaling data same as non-existing. */
954 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
956 } else if (!lq_sta->drv) {
957 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
961 if (!ieee80211_is_data(hdr->frame_control) ||
962 info->flags & IEEE80211_TX_CTL_NO_ACK)
965 /* This packet was aggregated but doesn't carry status info */
966 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
967 !(info->flags & IEEE80211_TX_STAT_AMPDU))
971 * Ignore this Tx frame response if its initial rate doesn't match
972 * that of latest Link Quality command. There may be stragglers
973 * from a previous Link Quality command, but we're no longer interested
974 * in those; they're either from the "active" mode while we're trying
975 * to check "search" mode, or a prior "search" mode after we've moved
976 * to a new "search" mode (which might become the new "active" mode).
979 ucode_rate = le32_to_cpu(table->rs_table[0]);
980 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
981 if (info->band == IEEE80211_BAND_5GHZ)
982 rate.index -= IWL_FIRST_OFDM_RATE;
983 mac_flags = info->status.rates[0].flags;
984 mac_index = info->status.rates[0].idx;
985 /* For HT packets, map MCS to PLCP */
986 if (mac_flags & IEEE80211_TX_RC_MCS) {
987 /* Remove # of streams */
988 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
989 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
992 * mac80211 HT index is always zero-indexed; we need to move
993 * HT OFDM rates after CCK rates in 2.4 GHz band
995 if (info->band == IEEE80211_BAND_2GHZ)
996 mac_index += IWL_FIRST_OFDM_RATE;
997 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
998 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
999 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1003 /* Here we actually compare this rate to the latest LQ command */
1004 if ((mac_index < 0) ||
1005 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1006 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1007 (rate.ant != info->status.antenna) ||
1008 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1009 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1010 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1011 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1012 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1013 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1014 (rate.index != mac_index)) {
1016 "initial rate %d does not match %d (0x%x)\n",
1017 mac_index, rate.index, ucode_rate);
1019 * Since rates mis-match, the last LQ command may have failed.
1020 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1023 lq_sta->missed_rate_counter++;
1024 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1025 lq_sta->missed_rate_counter = 0;
1027 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1029 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1031 /* Regardless, ignore this status info for outdated rate */
1034 /* Rate did match, so reset the missed_rate_counter */
1035 lq_sta->missed_rate_counter = 0;
1037 /* Figure out if rate scale algorithm is in active or search table */
1038 if (rs_rate_match(&rate,
1039 &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1040 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1041 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1042 } else if (rs_rate_match(&rate,
1043 &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1044 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1045 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1048 "Neither active nor search matches tx rate\n");
1049 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1050 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1051 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1052 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1053 rs_dump_rate(mvm, &rate, "ACTUAL");
1056 * no matching table found, let's by-pass the data collection
1057 * and continue to perform rate scale to find the rate table
1059 rs_stay_in_table(lq_sta, true);
1064 * Updating the frame history depends on whether packets were
1067 * For aggregation, all packets were transmitted at the same rate, the
1068 * first index into rate scale table.
1070 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1071 ucode_rate = le32_to_cpu(table->rs_table[0]);
1072 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1073 rs_collect_tx_data(curr_tbl, rate.index,
1074 info->status.ampdu_len,
1075 info->status.ampdu_ack_len);
1077 /* Update success/fail counts if not searching for new mode */
1078 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1079 lq_sta->total_success += info->status.ampdu_ack_len;
1080 lq_sta->total_failed += (info->status.ampdu_len -
1081 info->status.ampdu_ack_len);
1085 * For legacy, update frame history with for each Tx retry.
1087 retries = info->status.rates[0].count - 1;
1088 /* HW doesn't send more than 15 retries */
1089 retries = min(retries, 15);
1091 /* The last transmission may have been successful */
1092 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1093 /* Collect data for each rate used during failed TX attempts */
1094 for (i = 0; i <= retries; ++i) {
1095 ucode_rate = le32_to_cpu(table->rs_table[i]);
1096 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1098 * Only collect stats if retried rate is in the same RS
1099 * table as active/search.
1101 if (rs_rate_match(&rate, &curr_tbl->rate))
1103 else if (rs_rate_match(&rate, &other_tbl->rate))
1104 tmp_tbl = other_tbl;
1107 "Tx packet rate doesn't match ACTIVE or SEARCH tables\n");
1108 rs_dump_rate(mvm, &rate, "Tx PACKET:");
1109 rs_dump_rate(mvm, &curr_tbl->rate, "CURRENT:");
1110 rs_dump_rate(mvm, &other_tbl->rate, "OTHER:");
1113 rs_collect_tx_data(tmp_tbl, rate.index, 1,
1114 i < retries ? 0 : legacy_success);
1117 /* Update success/fail counts if not searching for new mode */
1118 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1119 lq_sta->total_success += legacy_success;
1120 lq_sta->total_failed += retries + (1 - legacy_success);
1123 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1124 lq_sta->last_rate_n_flags = ucode_rate;
1126 /* See if there's a better rate or modulation mode to try. */
1127 if (sta && sta->supp_rates[sband->band])
1128 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1132 * Begin a period of staying with a selected modulation mode.
1133 * Set "stay_in_tbl" flag to prevent any mode switches.
1134 * Set frame tx success limits according to legacy vs. high-throughput,
1135 * and reset overall (spanning all rates) tx success history statistics.
1136 * These control how long we stay using same modulation mode before
1137 * searching for a new mode.
1139 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1140 struct iwl_lq_sta *lq_sta)
1142 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1143 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1145 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1146 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1147 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1149 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1150 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1151 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1153 lq_sta->table_count = 0;
1154 lq_sta->total_failed = 0;
1155 lq_sta->total_success = 0;
1156 lq_sta->flush_timer = jiffies;
1157 lq_sta->visited_columns = 0;
1160 static s32 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1161 const struct rs_tx_column *column,
1164 /* Used to choose among HT tables */
1165 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1167 if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1168 column->mode != RS_SISO &&
1169 column->mode != RS_MIMO2))
1170 return expected_tpt_legacy;
1172 /* Legacy rates have only one table */
1173 if (column->mode == RS_LEGACY)
1174 return expected_tpt_legacy;
1176 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1177 /* Choose among many HT tables depending on number of streams
1178 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1180 if (column->mode == RS_SISO) {
1182 case RATE_MCS_CHAN_WIDTH_20:
1183 ht_tbl_pointer = expected_tpt_siso_20MHz;
1185 case RATE_MCS_CHAN_WIDTH_40:
1186 ht_tbl_pointer = expected_tpt_siso_40MHz;
1188 case RATE_MCS_CHAN_WIDTH_80:
1189 ht_tbl_pointer = expected_tpt_siso_80MHz;
1194 } else if (column->mode == RS_MIMO2) {
1196 case RATE_MCS_CHAN_WIDTH_20:
1197 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1199 case RATE_MCS_CHAN_WIDTH_40:
1200 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1202 case RATE_MCS_CHAN_WIDTH_80:
1203 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1212 if (!column->sgi && !lq_sta->is_agg) /* Normal */
1213 return ht_tbl_pointer[0];
1214 else if (column->sgi && !lq_sta->is_agg) /* SGI */
1215 return ht_tbl_pointer[1];
1216 else if (!column->sgi && lq_sta->is_agg) /* AGG */
1217 return ht_tbl_pointer[2];
1219 return ht_tbl_pointer[3];
1222 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1223 struct iwl_scale_tbl_info *tbl)
1225 struct rs_rate *rate = &tbl->rate;
1226 const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1228 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1232 * Find starting rate for new "search" high-throughput mode of modulation.
1233 * Goal is to find lowest expected rate (under perfect conditions) that is
1234 * above the current measured throughput of "active" mode, to give new mode
1235 * a fair chance to prove itself without too many challenges.
1237 * This gets called when transitioning to more aggressive modulation
1238 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1239 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1240 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1241 * bit rate will typically need to increase, but not if performance was bad.
1243 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1244 struct iwl_lq_sta *lq_sta,
1245 struct iwl_scale_tbl_info *tbl, /* "search" */
1246 u16 rate_mask, s8 index)
1248 /* "active" values */
1249 struct iwl_scale_tbl_info *active_tbl =
1250 &(lq_sta->lq_info[lq_sta->active_tbl]);
1251 s32 active_sr = active_tbl->win[index].success_ratio;
1252 s32 active_tpt = active_tbl->expected_tpt[index];
1254 /* expected "search" throughput */
1255 s32 *tpt_tbl = tbl->expected_tpt;
1257 s32 new_rate, high, low, start_hi;
1261 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1264 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1267 low = high_low & 0xff;
1268 high = (high_low >> 8) & 0xff;
1271 * Lower the "search" bit rate, to give new "search" mode
1272 * approximately the same throughput as "active" if:
1274 * 1) "Active" mode has been working modestly well (but not
1275 * great), and expected "search" throughput (under perfect
1276 * conditions) at candidate rate is above the actual
1277 * measured "active" throughput (but less than expected
1278 * "active" throughput under perfect conditions).
1280 * 2) "Active" mode has been working perfectly or very well
1281 * and expected "search" throughput (under perfect
1282 * conditions) at candidate rate is above expected
1283 * "active" throughput (under perfect conditions).
1285 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1286 ((active_sr > RS_SR_FORCE_DECREASE) &&
1287 (active_sr <= IWL_RATE_HIGH_TH) &&
1288 (tpt_tbl[rate] <= active_tpt))) ||
1289 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1290 (tpt_tbl[rate] > active_tpt))) {
1291 /* (2nd or later pass)
1292 * If we've already tried to raise the rate, and are
1293 * now trying to lower it, use the higher rate. */
1294 if (start_hi != IWL_RATE_INVALID) {
1295 new_rate = start_hi;
1301 /* Loop again with lower rate */
1302 if (low != IWL_RATE_INVALID)
1305 /* Lower rate not available, use the original */
1309 /* Else try to raise the "search" rate to match "active" */
1311 /* (2nd or later pass)
1312 * If we've already tried to lower the rate, and are
1313 * now trying to raise it, use the lower rate. */
1314 if (new_rate != IWL_RATE_INVALID)
1317 /* Loop again with higher rate */
1318 else if (high != IWL_RATE_INVALID) {
1322 /* Higher rate not available, use the original */
1333 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1335 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1336 return RATE_MCS_CHAN_WIDTH_80;
1337 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1338 return RATE_MCS_CHAN_WIDTH_40;
1340 return RATE_MCS_CHAN_WIDTH_20;
1344 * Check whether we should continue using same modulation mode, or
1345 * begin search for a new mode, based on:
1346 * 1) # tx successes or failures while using this mode
1347 * 2) # times calling this function
1348 * 3) elapsed time in this mode (not used, for now)
1350 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1352 struct iwl_scale_tbl_info *tbl;
1355 int flush_interval_passed = 0;
1356 struct iwl_mvm *mvm;
1359 active_tbl = lq_sta->active_tbl;
1361 tbl = &(lq_sta->lq_info[active_tbl]);
1363 /* If we've been disallowing search, see if we should now allow it */
1364 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1365 /* Elapsed time using current modulation mode */
1366 if (lq_sta->flush_timer)
1367 flush_interval_passed =
1369 (unsigned long)(lq_sta->flush_timer +
1370 RS_STAY_IN_COLUMN_TIMEOUT));
1373 * Check if we should allow search for new modulation mode.
1374 * If many frames have failed or succeeded, or we've used
1375 * this same modulation for a long time, allow search, and
1376 * reset history stats that keep track of whether we should
1377 * allow a new search. Also (below) reset all bitmaps and
1378 * stats in active history.
1381 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1382 (lq_sta->total_success > lq_sta->max_success_limit) ||
1383 ((!lq_sta->search_better_tbl) &&
1384 (lq_sta->flush_timer) && (flush_interval_passed))) {
1386 "LQ: stay is expired %d %d %d\n",
1387 lq_sta->total_failed,
1388 lq_sta->total_success,
1389 flush_interval_passed);
1391 /* Allow search for new mode */
1392 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1394 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1395 lq_sta->total_failed = 0;
1396 lq_sta->total_success = 0;
1397 lq_sta->flush_timer = 0;
1398 /* mark the current column as visited */
1399 lq_sta->visited_columns = BIT(tbl->column);
1401 * Else if we've used this modulation mode enough repetitions
1402 * (regardless of elapsed time or success/failure), reset
1403 * history bitmaps and rate-specific stats for all rates in
1407 lq_sta->table_count++;
1408 if (lq_sta->table_count >=
1409 lq_sta->table_count_limit) {
1410 lq_sta->table_count = 0;
1413 "LQ: stay in table clear win\n");
1414 for (i = 0; i < IWL_RATE_COUNT; i++)
1415 rs_rate_scale_clear_window(
1420 /* If transitioning to allow "search", reset all history
1421 * bitmaps and stats in active table (this will become the new
1422 * "search" table). */
1423 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1424 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
1425 for (i = 0; i < IWL_RATE_COUNT; i++)
1426 rs_rate_scale_clear_window(&(tbl->win[i]));
1432 * setup rate table in uCode
1434 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1435 struct ieee80211_sta *sta,
1436 struct iwl_lq_sta *lq_sta,
1437 struct rs_rate *rate)
1441 ucode_rate = ucode_rate_from_rs_rate(mvm, rate);
1442 rs_fill_link_cmd(mvm, sta, lq_sta, ucode_rate);
1443 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1446 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1447 struct ieee80211_hdr *hdr)
1449 u8 tid = IWL_MAX_TID_COUNT;
1451 if (ieee80211_is_data_qos(hdr->frame_control)) {
1452 u8 *qc = ieee80211_get_qos_ctl(hdr);
1456 if (unlikely(tid > IWL_MAX_TID_COUNT))
1457 tid = IWL_MAX_TID_COUNT;
1462 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1463 struct iwl_lq_sta *lq_sta,
1464 struct ieee80211_sta *sta,
1465 struct iwl_scale_tbl_info *tbl)
1468 enum rs_column next_col_id;
1469 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1470 const struct rs_tx_column *next_col;
1471 allow_column_func_t allow_func;
1472 u8 valid_ants = iwl_fw_valid_tx_ant(mvm->fw);
1473 s32 *expected_tpt_tbl;
1474 s32 tpt, max_expected_tpt;
1476 for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1477 next_col_id = curr_col->next_columns[i];
1479 if (next_col_id == RS_COLUMN_INVALID)
1482 if (lq_sta->visited_columns & BIT(next_col_id)) {
1483 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1488 next_col = &rs_tx_columns[next_col_id];
1490 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1492 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1493 next_col_id, valid_ants, next_col->ant);
1497 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1498 allow_func = next_col->checks[j];
1499 if (allow_func && !allow_func(mvm, sta, tbl))
1503 if (j != MAX_COLUMN_CHECKS) {
1505 "Skip column %d: not allowed (check %d failed)\n",
1511 tpt = lq_sta->last_tpt / 100;
1512 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1514 if (WARN_ON_ONCE(!expected_tpt_tbl))
1517 max_expected_tpt = 0;
1518 for (n = 0; n < IWL_RATE_COUNT; n++)
1519 if (expected_tpt_tbl[n] > max_expected_tpt)
1520 max_expected_tpt = expected_tpt_tbl[n];
1522 if (tpt >= max_expected_tpt) {
1524 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1525 next_col_id, max_expected_tpt, tpt);
1532 if (i == MAX_NEXT_COLUMNS)
1533 return RS_COLUMN_INVALID;
1535 IWL_DEBUG_RATE(mvm, "Found potential column %d\n", next_col_id);
1540 static int rs_switch_to_column(struct iwl_mvm *mvm,
1541 struct iwl_lq_sta *lq_sta,
1542 struct ieee80211_sta *sta,
1543 enum rs_column col_id)
1545 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1546 struct iwl_scale_tbl_info *search_tbl =
1547 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1548 struct rs_rate *rate = &search_tbl->rate;
1549 const struct rs_tx_column *column = &rs_tx_columns[col_id];
1550 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1551 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1552 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1556 memcpy(search_tbl, tbl, sz);
1558 rate->sgi = column->sgi;
1559 rate->ant = column->ant;
1561 if (column->mode == RS_LEGACY) {
1562 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1563 rate->type = LQ_LEGACY_A;
1565 rate->type = LQ_LEGACY_G;
1567 rate_mask = lq_sta->active_legacy_rate;
1568 } else if (column->mode == RS_SISO) {
1569 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1570 rate_mask = lq_sta->active_siso_rate;
1571 } else if (column->mode == RS_MIMO2) {
1572 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1573 rate_mask = lq_sta->active_mimo2_rate;
1575 WARN_ON_ONCE("Bad column mode");
1578 rate->bw = rs_bw_from_sta_bw(sta);
1579 search_tbl->column = col_id;
1580 rs_set_expected_tpt_table(lq_sta, search_tbl);
1582 /* Get the best matching rate if we're changing modes. e.g.
1583 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1585 if (curr_column->mode != column->mode) {
1586 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1587 rate_mask, rate->index);
1589 if ((rate_idx == IWL_RATE_INVALID) ||
1590 !(BIT(rate_idx) & rate_mask)) {
1592 "can not switch with index %d"
1594 rate_idx, rate_mask);
1599 rate->index = rate_idx;
1602 /* TODO: remove current_rate and keep using rs_rate all the way until
1603 * we need to fill in the rs_table in the LQ command
1605 search_tbl->current_rate = ucode_rate_from_rs_rate(mvm, rate);
1606 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1607 col_id, rate->index);
1609 lq_sta->visited_columns |= BIT(col_id);
1613 rate->type = LQ_NONE;
1619 * Do rate scaling and search for new modulation mode.
1621 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1622 struct sk_buff *skb,
1623 struct ieee80211_sta *sta,
1624 struct iwl_lq_sta *lq_sta)
1626 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1627 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1628 int low = IWL_RATE_INVALID;
1629 int high = IWL_RATE_INVALID;
1632 struct iwl_rate_scale_data *window = NULL;
1633 int current_tpt = IWL_INVALID_VALUE;
1634 int low_tpt = IWL_INVALID_VALUE;
1635 int high_tpt = IWL_INVALID_VALUE;
1637 s8 scale_action = 0;
1640 struct iwl_scale_tbl_info *tbl, *tbl1;
1641 u16 rate_scale_index_msk = 0;
1646 u8 tid = IWL_MAX_TID_COUNT;
1647 u8 prev_agg = lq_sta->is_agg;
1648 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1649 struct iwl_mvm_tid_data *tid_data;
1650 struct rs_rate *rate;
1652 /* Send management frames and NO_ACK data using lowest rate. */
1653 /* TODO: this could probably be improved.. */
1654 if (!ieee80211_is_data(hdr->frame_control) ||
1655 info->flags & IEEE80211_TX_CTL_NO_ACK)
1658 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1660 tid = rs_get_tid(lq_sta, hdr);
1661 if ((tid != IWL_MAX_TID_COUNT) &&
1662 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1663 tid_data = &sta_priv->tid_data[tid];
1664 if (tid_data->state == IWL_AGG_OFF)
1673 * Select rate-scale / modulation-mode table to work with in
1674 * the rest of this function: "search" if searching for better
1675 * modulation mode, or "active" if doing rate scaling within a mode.
1677 if (!lq_sta->search_better_tbl)
1678 active_tbl = lq_sta->active_tbl;
1680 active_tbl = 1 - lq_sta->active_tbl;
1682 tbl = &(lq_sta->lq_info[active_tbl]);
1685 if (prev_agg != lq_sta->is_agg) {
1687 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
1688 prev_agg, lq_sta->is_agg);
1689 rs_set_expected_tpt_table(lq_sta, tbl);
1692 /* current tx rate */
1693 index = lq_sta->last_txrate_idx;
1695 /* rates available for this association, and for modulation mode */
1696 rate_mask = rs_get_supported_rates(lq_sta, rate);
1698 /* mask with station rate restriction */
1699 if (is_legacy(rate)) {
1700 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1701 /* supp_rates has no CCK bits in A mode */
1702 rate_scale_index_msk = (u16) (rate_mask &
1703 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1705 rate_scale_index_msk = (u16) (rate_mask &
1706 lq_sta->supp_rates);
1709 rate_scale_index_msk = rate_mask;
1712 if (!rate_scale_index_msk)
1713 rate_scale_index_msk = rate_mask;
1715 if (!((BIT(index) & rate_scale_index_msk))) {
1716 IWL_ERR(mvm, "Current Rate is not valid\n");
1717 if (lq_sta->search_better_tbl) {
1718 /* revert to active table if search table is not valid*/
1719 rate->type = LQ_NONE;
1720 lq_sta->search_better_tbl = 0;
1721 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1722 /* get "active" rate info */
1723 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1724 tbl->rate.index = index;
1725 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
1730 /* Get expected throughput table and history window for current rate */
1731 if (!tbl->expected_tpt) {
1732 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1736 /* force user max rate if set by user */
1737 if ((lq_sta->max_rate_idx != -1) &&
1738 (lq_sta->max_rate_idx < index)) {
1739 index = lq_sta->max_rate_idx;
1741 window = &(tbl->win[index]);
1743 "Forcing user max rate %d\n",
1748 window = &(tbl->win[index]);
1751 * If there is not enough history to calculate actual average
1752 * throughput, keep analyzing results of more tx frames, without
1753 * changing rate or mode (bypass most of the rest of this function).
1754 * Set up new rate table in uCode only if old rate is not supported
1755 * in current association (use new rate found above).
1757 fail_count = window->counter - window->success_counter;
1758 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1759 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1761 "(%s: %d): Test Window: succ %d total %d\n",
1762 rs_pretty_lq_type(rate->type),
1763 index, window->success_counter, window->counter);
1765 /* Can't calculate this yet; not enough history */
1766 window->average_tpt = IWL_INVALID_VALUE;
1768 /* Should we stay with this modulation mode,
1769 * or search for a new one? */
1770 rs_stay_in_table(lq_sta, false);
1774 /* Else we have enough samples; calculate estimate of
1775 * actual average throughput */
1776 if (window->average_tpt != ((window->success_ratio *
1777 tbl->expected_tpt[index] + 64) / 128)) {
1778 window->average_tpt = ((window->success_ratio *
1779 tbl->expected_tpt[index] + 64) / 128);
1782 /* If we are searching for better modulation mode, check success. */
1783 if (lq_sta->search_better_tbl) {
1784 /* If good success, continue using the "search" mode;
1785 * no need to send new link quality command, since we're
1786 * continuing to use the setup that we've been trying. */
1787 if (window->average_tpt > lq_sta->last_tpt) {
1789 "SWITCHING TO NEW TABLE SR: %d "
1790 "cur-tpt %d old-tpt %d\n",
1791 window->success_ratio,
1792 window->average_tpt,
1795 /* Swap tables; "search" becomes "active" */
1796 lq_sta->active_tbl = active_tbl;
1797 current_tpt = window->average_tpt;
1798 /* Else poor success; go back to mode in "active" table */
1801 "GOING BACK TO THE OLD TABLE: SR %d "
1802 "cur-tpt %d old-tpt %d\n",
1803 window->success_ratio,
1804 window->average_tpt,
1807 /* Nullify "search" table */
1808 rate->type = LQ_NONE;
1810 /* Revert to "active" table */
1811 active_tbl = lq_sta->active_tbl;
1812 tbl = &(lq_sta->lq_info[active_tbl]);
1814 /* Revert to "active" rate and throughput info */
1815 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1816 current_tpt = lq_sta->last_tpt;
1818 /* Need to set up a new rate table in uCode */
1822 /* Either way, we've made a decision; modulation mode
1823 * search is done, allow rate adjustment next time. */
1824 lq_sta->search_better_tbl = 0;
1825 done_search = 1; /* Don't switch modes below! */
1829 /* (Else) not in search of better modulation mode, try for better
1830 * starting rate, while staying in this mode. */
1831 high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
1833 low = high_low & 0xff;
1834 high = (high_low >> 8) & 0xff;
1836 /* If user set max rate, dont allow higher than user constrain */
1837 if ((lq_sta->max_rate_idx != -1) &&
1838 (lq_sta->max_rate_idx < high))
1839 high = IWL_RATE_INVALID;
1841 sr = window->success_ratio;
1843 /* Collect measured throughputs for current and adjacent rates */
1844 current_tpt = window->average_tpt;
1845 if (low != IWL_RATE_INVALID)
1846 low_tpt = tbl->win[low].average_tpt;
1847 if (high != IWL_RATE_INVALID)
1848 high_tpt = tbl->win[high].average_tpt;
1851 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
1852 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
1853 low, high, low_tpt, high_tpt);
1857 /* Too many failures, decrease rate */
1858 if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1860 "decrease rate because of low SR\n");
1862 /* No throughput measured yet for adjacent rates; try increase. */
1863 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1864 (high_tpt == IWL_INVALID_VALUE)) {
1865 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) {
1867 "Good SR and no high rate measurement. "
1870 } else if (low != IWL_RATE_INVALID) {
1872 "Remain in current rate\n");
1877 /* Both adjacent throughputs are measured, but neither one has better
1878 * throughput; we're using the best rate, don't change it! */
1879 else if ((low_tpt != IWL_INVALID_VALUE) &&
1880 (high_tpt != IWL_INVALID_VALUE) &&
1881 (low_tpt < current_tpt) &&
1882 (high_tpt < current_tpt)) {
1884 "Both high and low are worse. "
1889 /* At least one adjacent rate's throughput is measured,
1890 * and may have better performance. */
1892 /* Higher adjacent rate's throughput is measured */
1893 if (high_tpt != IWL_INVALID_VALUE) {
1894 /* Higher rate has better throughput */
1895 if (high_tpt > current_tpt &&
1896 sr >= IWL_RATE_INCREASE_TH) {
1898 "Higher rate is better and good "
1899 "SR. Increate rate\n");
1903 "Higher rate isn't better OR "
1904 "no good SR. Maintain rate\n");
1908 /* Lower adjacent rate's throughput is measured */
1909 } else if (low_tpt != IWL_INVALID_VALUE) {
1910 /* Lower rate has better throughput */
1911 if (low_tpt > current_tpt) {
1913 "Lower rate is better. "
1916 } else if (sr >= IWL_RATE_INCREASE_TH) {
1918 "Lower rate isn't better and "
1919 "good SR. Increase rate\n");
1925 /* Sanity check; asked for decrease, but success rate or throughput
1926 * has been good at old rate. Don't change it. */
1927 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1928 ((sr > IWL_RATE_HIGH_TH) ||
1929 (current_tpt > (100 * tbl->expected_tpt[low])))) {
1931 "Sanity check failed. Maintain rate\n");
1935 /* Force a search in case BT doesn't like us being in MIMO */
1936 if (is_mimo(rate) &&
1937 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
1939 "BT Coex forbids MIMO. Search for new config\n");
1940 rs_stay_in_table(lq_sta, true);
1944 switch (scale_action) {
1946 /* Decrease starting rate, update uCode's rate table */
1947 if (low != IWL_RATE_INVALID) {
1952 "At the bottom rate. Can't decrease\n");
1957 /* Increase starting rate, update uCode's rate table */
1958 if (high != IWL_RATE_INVALID) {
1963 "At the top rate. Can't increase\n");
1974 /* Replace uCode's rate table for the destination station. */
1976 tbl->rate.index = index;
1977 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
1980 rs_stay_in_table(lq_sta, false);
1983 * Search for new modulation mode if we're:
1984 * 1) Not changing rates right now
1985 * 2) Not just finishing up a search
1986 * 3) Allowing a new search
1988 if (!update_lq && !done_search &&
1989 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
1990 && window->counter) {
1991 enum rs_column next_column;
1993 /* Save current throughput to compare with "search" throughput*/
1994 lq_sta->last_tpt = current_tpt;
1997 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
1998 update_lq, done_search, lq_sta->rs_state,
2001 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2002 if (next_column != RS_COLUMN_INVALID) {
2003 int ret = rs_switch_to_column(mvm, lq_sta, sta,
2006 lq_sta->search_better_tbl = 1;
2009 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2010 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2013 /* If new "search" mode was selected, set up in uCode table */
2014 if (lq_sta->search_better_tbl) {
2015 /* Access the "search" table, clear its history. */
2016 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2017 for (i = 0; i < IWL_RATE_COUNT; i++)
2018 rs_rate_scale_clear_window(&(tbl->win[i]));
2020 /* Use new "search" start rate */
2021 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2023 rs_dump_rate(mvm, &tbl->rate,
2024 "Switch to SEARCH TABLE:");
2025 rs_fill_link_cmd(mvm, sta, lq_sta, tbl->current_rate);
2026 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2032 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2033 /* If the "active" (non-search) mode was legacy,
2034 * and we've tried switching antennas,
2035 * but we haven't been able to try HT modes (not available),
2036 * stay with best antenna legacy modulation for a while
2037 * before next round of mode comparisons. */
2038 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2039 if (is_legacy(&tbl1->rate) && !sta->ht_cap.ht_supported) {
2040 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2041 rs_set_stay_in_table(mvm, 1, lq_sta);
2043 /* If we're in an HT mode, and all 3 mode switch actions
2044 * have been tried and compared, stay in this best modulation
2045 * mode for a while before next round of mode comparisons. */
2046 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2047 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2048 (tid != IWL_MAX_TID_COUNT)) {
2049 tid_data = &sta_priv->tid_data[tid];
2050 if (tid_data->state == IWL_AGG_OFF) {
2052 "try to aggregate tid %d\n",
2054 rs_tl_turn_on_agg(mvm, tid,
2058 rs_set_stay_in_table(mvm, 0, lq_sta);
2063 tbl->rate.index = index;
2064 tbl->current_rate = ucode_rate_from_rs_rate(mvm, &tbl->rate);
2065 lq_sta->last_txrate_idx = index;
2069 * rs_initialize_lq - Initialize a station's hardware rate table
2071 * The uCode's station table contains a table of fallback rates
2072 * for automatic fallback during transmission.
2074 * NOTE: This sets up a default set of values. These will be replaced later
2075 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2078 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2079 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2080 * which requires station table entry to exist).
2082 static void rs_initialize_lq(struct iwl_mvm *mvm,
2083 struct ieee80211_sta *sta,
2084 struct iwl_lq_sta *lq_sta,
2085 enum ieee80211_band band,
2088 struct iwl_scale_tbl_info *tbl;
2089 struct rs_rate *rate;
2095 if (!sta || !lq_sta)
2098 i = lq_sta->last_txrate_idx;
2100 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2102 if (!lq_sta->search_better_tbl)
2103 active_tbl = lq_sta->active_tbl;
2105 active_tbl = 1 - lq_sta->active_tbl;
2107 tbl = &(lq_sta->lq_info[active_tbl]);
2110 if ((i < 0) || (i >= IWL_RATE_COUNT))
2114 rate->ant = first_antenna(valid_tx_ant);
2116 rate->bw = RATE_MCS_CHAN_WIDTH_20;
2117 if (band == IEEE80211_BAND_5GHZ)
2118 rate->type = LQ_LEGACY_A;
2120 rate->type = LQ_LEGACY_G;
2122 ucode_rate = ucode_rate_from_rs_rate(mvm, rate);
2123 tbl->current_rate = ucode_rate;
2125 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2126 if (rate->ant == ANT_A)
2127 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2129 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2131 rs_set_expected_tpt_table(lq_sta, tbl);
2132 rs_fill_link_cmd(NULL, NULL, lq_sta, ucode_rate);
2133 /* TODO restore station should remember the lq cmd */
2134 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2137 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2138 struct ieee80211_tx_rate_control *txrc)
2140 struct sk_buff *skb = txrc->skb;
2141 struct ieee80211_supported_band *sband = txrc->sband;
2142 struct iwl_op_mode *op_mode __maybe_unused =
2143 (struct iwl_op_mode *)mvm_r;
2144 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2145 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2146 struct iwl_lq_sta *lq_sta = mvm_sta;
2148 /* Get max rate if user set max rate */
2150 lq_sta->max_rate_idx = txrc->max_rate_idx;
2151 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2152 (lq_sta->max_rate_idx != -1))
2153 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2154 if ((lq_sta->max_rate_idx < 0) ||
2155 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2156 lq_sta->max_rate_idx = -1;
2159 /* Treat uninitialized rate scaling data same as non-existing. */
2160 if (lq_sta && !lq_sta->drv) {
2161 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2165 /* Send management frames and NO_ACK data using lowest rate. */
2166 if (rate_control_send_low(sta, mvm_sta, txrc))
2169 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2170 info->band, &info->control.rates[0]);
2172 info->control.rates[0].count = 1;
2175 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2178 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2179 struct iwl_op_mode *op_mode __maybe_unused =
2180 (struct iwl_op_mode *)mvm_rate;
2181 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2183 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2185 return &sta_priv->lq_sta;
2188 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2191 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2192 (0x3 << (2 * (nss - 1)));
2193 rx_mcs >>= (2 * (nss - 1));
2195 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2196 return IWL_RATE_MCS_7_INDEX;
2197 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2198 return IWL_RATE_MCS_8_INDEX;
2199 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2200 return IWL_RATE_MCS_9_INDEX;
2202 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2206 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2207 struct ieee80211_sta_vht_cap *vht_cap,
2208 struct iwl_lq_sta *lq_sta)
2211 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2213 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2214 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2215 if (i == IWL_RATE_9M_INDEX)
2218 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2219 if (i == IWL_RATE_MCS_9_INDEX &&
2220 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2223 lq_sta->active_siso_rate |= BIT(i);
2227 if (sta->rx_nss < 2)
2230 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2231 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2232 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2233 if (i == IWL_RATE_9M_INDEX)
2236 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2237 if (i == IWL_RATE_MCS_9_INDEX &&
2238 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2241 lq_sta->active_mimo2_rate |= BIT(i);
2247 * Called after adding a new station to initialize rate scaling
2249 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2250 enum ieee80211_band band, bool init)
2253 struct ieee80211_hw *hw = mvm->hw;
2254 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2255 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2256 struct iwl_mvm_sta *sta_priv;
2257 struct iwl_lq_sta *lq_sta;
2258 struct ieee80211_supported_band *sband;
2259 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2261 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2262 lq_sta = &sta_priv->lq_sta;
2263 memset(lq_sta, 0, sizeof(*lq_sta));
2265 sband = hw->wiphy->bands[band];
2267 lq_sta->lq.sta_id = sta_priv->sta_id;
2269 for (j = 0; j < LQ_SIZE; j++)
2270 for (i = 0; i < IWL_RATE_COUNT; i++)
2271 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2273 lq_sta->flush_timer = 0;
2274 lq_sta->supp_rates = sta->supp_rates[sband->band];
2277 "LQ: *** rate scale station global init for station %d ***\n",
2279 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2280 * the lowest or the highest rate.. Could consider using RSSI from
2281 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2284 lq_sta->max_rate_idx = -1;
2285 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2286 lq_sta->band = sband->band;
2288 * active legacy rates as per supported rates bitmap
2290 supp = sta->supp_rates[sband->band];
2291 lq_sta->active_legacy_rate = 0;
2292 for_each_set_bit(i, &supp, BITS_PER_LONG)
2293 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2295 /* TODO: should probably account for rx_highest for both HT/VHT */
2296 if (!vht_cap || !vht_cap->vht_supported) {
2297 /* active_siso_rate mask includes 9 MBits (bit 5),
2298 * and CCK (bits 0-3), supp_rates[] does not;
2299 * shift to convert format, force 9 MBits off.
2301 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2302 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2303 lq_sta->active_siso_rate &= ~((u16)0x2);
2304 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2307 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2308 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2309 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2310 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2312 lq_sta->is_vht = false;
2314 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2315 lq_sta->is_vht = true;
2319 "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
2320 lq_sta->active_siso_rate,
2321 lq_sta->active_mimo2_rate,
2324 /* These values will be overridden later */
2325 lq_sta->lq.single_stream_ant_msk =
2326 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2327 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2329 /* as default allow aggregation for all tids */
2330 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2333 /* Set last_txrate_idx to lowest rate */
2334 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2335 if (sband->band == IEEE80211_BAND_5GHZ)
2336 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2338 #ifdef CONFIG_MAC80211_DEBUGFS
2339 lq_sta->dbg_fixed_rate = 0;
2342 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2345 static void rs_rate_update(void *mvm_r,
2346 struct ieee80211_supported_band *sband,
2347 struct cfg80211_chan_def *chandef,
2348 struct ieee80211_sta *sta, void *priv_sta,
2352 struct iwl_op_mode *op_mode =
2353 (struct iwl_op_mode *)mvm_r;
2354 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2356 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2357 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2358 ieee80211_stop_tx_ba_session(sta, tid);
2360 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2363 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2364 struct ieee80211_sta *sta,
2365 struct iwl_lq_sta *lq_sta, u32 new_rate)
2367 struct rs_rate rate;
2369 int repeat_rate = 0;
2370 u8 ant_toggle_cnt = 0;
2371 u8 use_ht_possible = 1;
2372 u8 valid_tx_ant = 0;
2373 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2375 /* Override starting rate (index 0) if needed for debug purposes */
2376 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2378 rs_rate_from_ucode_rate(new_rate, lq_sta->band, &rate);
2380 /* How many times should we repeat the initial rate? */
2381 if (is_legacy(&rate)) {
2383 repeat_rate = IWL_NUMBER_TRY;
2385 repeat_rate = min(IWL_HT_NUMBER_TRY,
2386 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2389 lq_cmd->mimo_delim = is_mimo(&rate) ? 1 : 0;
2391 /* Fill 1st table entry (index 0) */
2392 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2394 if (num_of_ant(rate.ant) == 1)
2395 lq_cmd->single_stream_ant_msk = rate.ant;
2396 /* otherwise we don't modify the existing value */
2401 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2403 /* Fill rest of rate table */
2404 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2405 /* Repeat initial/next rate.
2406 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2407 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2408 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2409 if (is_legacy(&rate)) {
2410 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2413 rs_toggle_antenna(valid_tx_ant,
2418 /* Override next rate if needed for debug purposes */
2419 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2421 /* Fill next table entry */
2422 lq_cmd->rs_table[index] =
2423 cpu_to_le32(new_rate);
2428 rs_rate_from_ucode_rate(new_rate, lq_sta->band, &rate);
2430 /* Indicate to uCode which entries might be MIMO.
2431 * If initial rate was MIMO, this will finally end up
2432 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2434 lq_cmd->mimo_delim = index;
2437 new_rate = rs_get_lower_rate(lq_sta, &rate, rate.index,
2440 /* How many times should we repeat the next rate? */
2441 if (is_legacy(&rate)) {
2442 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2445 rs_toggle_antenna(valid_tx_ant,
2449 repeat_rate = IWL_NUMBER_TRY;
2451 repeat_rate = IWL_HT_NUMBER_TRY;
2454 /* Don't allow HT rates after next pass.
2455 * rs_get_lower_rate() will change type to LQ_LEGACY_A
2458 use_ht_possible = 0;
2460 /* Override next rate if needed for debug purposes */
2461 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2463 /* Fill next table entry */
2464 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2470 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2471 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2473 lq_cmd->agg_time_limit =
2474 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2477 lq_cmd->agg_time_limit =
2478 cpu_to_le16(iwl_mvm_bt_coex_agg_time_limit(mvm, sta));
2481 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2485 /* rate scale requires free function to be implemented */
2486 static void rs_free(void *mvm_rate)
2491 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2494 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2495 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2497 IWL_DEBUG_RATE(mvm, "enter\n");
2498 IWL_DEBUG_RATE(mvm, "leave\n");
2501 #ifdef CONFIG_MAC80211_DEBUGFS
2502 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2505 struct iwl_mvm *mvm;
2510 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2511 if (lq_sta->dbg_fixed_rate) {
2513 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2514 >> RATE_MCS_ANT_POS);
2515 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2516 *rate_n_flags = lq_sta->dbg_fixed_rate;
2518 lq_sta->dbg_fixed_rate = 0;
2520 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2521 ant_sel_tx, valid_tx_ant);
2522 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2527 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2528 const char __user *user_buf, size_t count, loff_t *ppos)
2530 struct iwl_lq_sta *lq_sta = file->private_data;
2531 struct iwl_mvm *mvm;
2538 memset(buf, 0, sizeof(buf));
2539 buf_size = min(count, sizeof(buf) - 1);
2540 if (copy_from_user(buf, user_buf, buf_size))
2543 if (sscanf(buf, "%x", &parsed_rate) == 1)
2544 lq_sta->dbg_fixed_rate = parsed_rate;
2546 lq_sta->dbg_fixed_rate = 0;
2548 rs_program_fix_rate(mvm, lq_sta);
2553 static const char *rs_pretty_lq_type(enum iwl_table_type type)
2555 static const char * const lq_types[] = {
2557 [LQ_LEGACY_A] = "LEGACY_A",
2558 [LQ_LEGACY_G] = "LEGACY_G",
2559 [LQ_HT_SISO] = "HT SISO",
2560 [LQ_HT_MIMO2] = "HT MIMO",
2561 [LQ_VHT_SISO] = "VHT SISO",
2562 [LQ_VHT_MIMO2] = "VHT MIMO",
2565 if (type < LQ_NONE || type >= LQ_MAX)
2568 return lq_types[type];
2571 static const char *rs_pretty_ant(u8 ant)
2573 static const char * const ant_name[] = {
2574 [ANT_NONE] = "None",
2587 return ant_name[ant];
2590 static int rs_pretty_print_rate(char *buf, const u32 rate)
2594 u8 mcs = 0, nss = 0;
2595 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2597 if (!(rate & RATE_MCS_HT_MSK) &&
2598 !(rate & RATE_MCS_VHT_MSK)) {
2599 int index = iwl_hwrate_to_plcp_idx(rate);
2601 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2602 rs_pretty_ant(ant), iwl_rate_mcs[index].mbps);
2605 if (rate & RATE_MCS_VHT_MSK) {
2607 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2608 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2609 >> RATE_VHT_MCS_NSS_POS) + 1;
2610 } else if (rate & RATE_MCS_HT_MSK) {
2612 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2614 type = "Unknown"; /* shouldn't happen */
2617 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2618 case RATE_MCS_CHAN_WIDTH_20:
2621 case RATE_MCS_CHAN_WIDTH_40:
2624 case RATE_MCS_CHAN_WIDTH_80:
2627 case RATE_MCS_CHAN_WIDTH_160:
2634 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2635 type, rs_pretty_ant(ant), bw, mcs, nss,
2636 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2637 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
2638 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2639 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2640 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2643 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2644 char __user *user_buf, size_t count, loff_t *ppos)
2651 struct iwl_lq_sta *lq_sta = file->private_data;
2652 struct iwl_mvm *mvm;
2653 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2654 struct rs_rate *rate = &tbl->rate;
2656 buff = kmalloc(2048, GFP_KERNEL);
2660 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2661 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2662 lq_sta->total_failed, lq_sta->total_success,
2663 lq_sta->active_legacy_rate);
2664 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2665 lq_sta->dbg_fixed_rate);
2666 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2667 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2668 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2669 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
2670 desc += sprintf(buff+desc, "lq type %s\n",
2671 (is_legacy(rate)) ? "legacy" :
2672 is_vht(rate) ? "VHT" : "HT");
2673 if (!is_legacy(rate)) {
2674 desc += sprintf(buff+desc, " %s",
2675 (is_siso(rate)) ? "SISO" : "MIMO2");
2676 desc += sprintf(buff+desc, " %s",
2677 (is_ht20(rate)) ? "20MHz" :
2678 (is_ht40(rate)) ? "40MHz" :
2679 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
2680 desc += sprintf(buff+desc, " %s %s\n",
2681 (rate->sgi) ? "SGI" : "NGI",
2682 (lq_sta->is_agg) ? "AGG on" : "");
2684 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2685 lq_sta->last_rate_n_flags);
2686 desc += sprintf(buff+desc,
2687 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
2689 lq_sta->lq.mimo_delim,
2690 lq_sta->lq.single_stream_ant_msk,
2691 lq_sta->lq.dual_stream_ant_msk);
2693 desc += sprintf(buff+desc,
2694 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2695 le16_to_cpu(lq_sta->lq.agg_time_limit),
2696 lq_sta->lq.agg_disable_start_th,
2697 lq_sta->lq.agg_frame_cnt_limit);
2699 desc += sprintf(buff+desc,
2700 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2701 lq_sta->lq.initial_rate_index[0],
2702 lq_sta->lq.initial_rate_index[1],
2703 lq_sta->lq.initial_rate_index[2],
2704 lq_sta->lq.initial_rate_index[3]);
2706 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2707 u32 rate = le32_to_cpu(lq_sta->lq.rs_table[i]);
2708 desc += sprintf(buff+desc,
2712 desc += rs_pretty_print_rate(buff+desc, rate);
2715 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2720 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2721 .write = rs_sta_dbgfs_scale_table_write,
2722 .read = rs_sta_dbgfs_scale_table_read,
2723 .open = simple_open,
2724 .llseek = default_llseek,
2726 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2727 char __user *user_buf, size_t count, loff_t *ppos)
2733 struct iwl_scale_tbl_info *tbl;
2734 struct rs_rate *rate;
2735 struct iwl_lq_sta *lq_sta = file->private_data;
2737 buff = kmalloc(1024, GFP_KERNEL);
2741 for (i = 0; i < LQ_SIZE; i++) {
2742 tbl = &(lq_sta->lq_info[i]);
2744 desc += sprintf(buff+desc,
2745 "%s type=%d SGI=%d BW=%s DUP=0\n"
2747 lq_sta->active_tbl == i ? "*" : "x",
2750 is_ht20(rate) ? "20Mhz" :
2751 is_ht40(rate) ? "40Mhz" :
2752 is_ht80(rate) ? "80Mhz" : "ERR",
2754 for (j = 0; j < IWL_RATE_COUNT; j++) {
2755 desc += sprintf(buff+desc,
2756 "counter=%d success=%d %%=%d\n",
2757 tbl->win[j].counter,
2758 tbl->win[j].success_counter,
2759 tbl->win[j].success_ratio);
2762 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2767 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2768 .read = rs_sta_dbgfs_stats_table_read,
2769 .open = simple_open,
2770 .llseek = default_llseek,
2773 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2775 struct iwl_lq_sta *lq_sta = mvm_sta;
2776 lq_sta->rs_sta_dbgfs_scale_table_file =
2777 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2778 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2779 lq_sta->rs_sta_dbgfs_stats_table_file =
2780 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2781 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2782 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2783 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2784 &lq_sta->tx_agg_tid_en);
2787 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2789 struct iwl_lq_sta *lq_sta = mvm_sta;
2790 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2791 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2792 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2797 * Initialization of rate scaling information is done by driver after
2798 * the station is added. Since mac80211 calls this function before a
2799 * station is added we ignore it.
2801 static void rs_rate_init_stub(void *mvm_r,
2802 struct ieee80211_supported_band *sband,
2803 struct cfg80211_chan_def *chandef,
2804 struct ieee80211_sta *sta, void *mvm_sta)
2807 static struct rate_control_ops rs_mvm_ops = {
2810 .tx_status = rs_tx_status,
2811 .get_rate = rs_get_rate,
2812 .rate_init = rs_rate_init_stub,
2815 .alloc_sta = rs_alloc_sta,
2816 .free_sta = rs_free_sta,
2817 .rate_update = rs_rate_update,
2818 #ifdef CONFIG_MAC80211_DEBUGFS
2819 .add_sta_debugfs = rs_add_debugfs,
2820 .remove_sta_debugfs = rs_remove_debugfs,
2824 int iwl_mvm_rate_control_register(void)
2826 return ieee80211_rate_control_register(&rs_mvm_ops);
2829 void iwl_mvm_rate_control_unregister(void)
2831 ieee80211_rate_control_unregister(&rs_mvm_ops);
2835 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2836 * Tx protection, according to this rquest and previous requests,
2837 * and send the LQ command.
2838 * @mvmsta: The station
2839 * @enable: Enable Tx protection?
2841 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2844 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2846 lockdep_assert_held(&mvm->mutex);
2849 if (mvmsta->tx_protection == 0)
2850 lq->flags |= LQ_FLAG_USE_RTS_MSK;
2851 mvmsta->tx_protection++;
2853 mvmsta->tx_protection--;
2854 if (mvmsta->tx_protection == 0)
2855 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
2858 return iwl_mvm_send_lq_cmd(mvm, lq, false);