1 /******************************************************************************
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
19 * The full GNU General Public License is included in this distribution in the
20 * file called LICENSE.
22 * Contact Information:
23 * Intel Linux Wireless <ilw@linux.intel.com>
24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26 *****************************************************************************/
27 #include <linux/kernel.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
36 #include <linux/workqueue.h>
40 #include "iwl-op-mode.h"
44 #define RS_NAME "iwl-mvm-rs"
46 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
48 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
49 * Use this macro when dealing with thresholds consts set as a percentage
51 #define RS_PERCENT(x) (128 * x)
53 static u8 rs_ht_to_legacy
[] = {
54 [IWL_RATE_MCS_0_INDEX
] = IWL_RATE_6M_INDEX
,
55 [IWL_RATE_MCS_1_INDEX
] = IWL_RATE_9M_INDEX
,
56 [IWL_RATE_MCS_2_INDEX
] = IWL_RATE_12M_INDEX
,
57 [IWL_RATE_MCS_3_INDEX
] = IWL_RATE_18M_INDEX
,
58 [IWL_RATE_MCS_4_INDEX
] = IWL_RATE_24M_INDEX
,
59 [IWL_RATE_MCS_5_INDEX
] = IWL_RATE_36M_INDEX
,
60 [IWL_RATE_MCS_6_INDEX
] = IWL_RATE_48M_INDEX
,
61 [IWL_RATE_MCS_7_INDEX
] = IWL_RATE_54M_INDEX
,
62 [IWL_RATE_MCS_8_INDEX
] = IWL_RATE_54M_INDEX
,
63 [IWL_RATE_MCS_9_INDEX
] = IWL_RATE_54M_INDEX
,
66 static const u8 ant_toggle_lookup
[] = {
67 [ANT_NONE
] = ANT_NONE
,
77 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
78 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
79 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
80 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
81 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
82 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
83 IWL_RATE_##rp##M_INDEX, \
84 IWL_RATE_##rn##M_INDEX }
86 #define IWL_DECLARE_MCS_RATE(s) \
87 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
88 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
89 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_INVM_INDEX, \
97 * rate, ht rate, prev rate, next rate
99 * If there isn't a valid next or previous rate then INV is used which
100 * maps to IWL_RATE_INVALID
103 static const struct iwl_rs_rate_info iwl_rates
[IWL_RATE_COUNT
] = {
104 IWL_DECLARE_RATE_INFO(1, INV
, INV
, 2), /* 1mbps */
105 IWL_DECLARE_RATE_INFO(2, INV
, 1, 5), /* 2mbps */
106 IWL_DECLARE_RATE_INFO(5, INV
, 2, 11), /*5.5mbps */
107 IWL_DECLARE_RATE_INFO(11, INV
, 9, 12), /* 11mbps */
108 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
109 IWL_DECLARE_RATE_INFO(9, INV
, 6, 11), /* 9mbps */
110 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
111 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
112 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
113 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
114 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
115 IWL_DECLARE_RATE_INFO(54, 6, 48, INV
), /* 54mbps ; MCS 6 */
116 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
117 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
118 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
123 RS_ACTION_DOWNSCALE
= -1,
124 RS_ACTION_UPSCALE
= 1,
127 enum rs_column_mode
{
134 #define MAX_NEXT_COLUMNS 7
135 #define MAX_COLUMN_CHECKS 3
137 typedef bool (*allow_column_func_t
) (struct iwl_mvm
*mvm
,
138 struct ieee80211_sta
*sta
,
139 struct iwl_scale_tbl_info
*tbl
);
141 struct rs_tx_column
{
142 enum rs_column_mode mode
;
145 enum rs_column next_columns
[MAX_NEXT_COLUMNS
];
146 allow_column_func_t checks
[MAX_COLUMN_CHECKS
];
149 static bool rs_ant_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
150 struct iwl_scale_tbl_info
*tbl
)
152 return iwl_mvm_bt_coex_is_ant_avail(mvm
, tbl
->rate
.ant
);
155 static bool rs_mimo_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
156 struct iwl_scale_tbl_info
*tbl
)
158 if (!sta
->ht_cap
.ht_supported
)
161 if (sta
->smps_mode
== IEEE80211_SMPS_STATIC
)
164 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm
)) < 2)
167 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
))
173 static bool rs_siso_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
174 struct iwl_scale_tbl_info
*tbl
)
176 if (!sta
->ht_cap
.ht_supported
)
182 static bool rs_sgi_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
183 struct iwl_scale_tbl_info
*tbl
)
185 struct rs_rate
*rate
= &tbl
->rate
;
186 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
187 struct ieee80211_sta_vht_cap
*vht_cap
= &sta
->vht_cap
;
189 if (is_ht20(rate
) && (ht_cap
->cap
&
190 IEEE80211_HT_CAP_SGI_20
))
192 if (is_ht40(rate
) && (ht_cap
->cap
&
193 IEEE80211_HT_CAP_SGI_40
))
195 if (is_ht80(rate
) && (vht_cap
->cap
&
196 IEEE80211_VHT_CAP_SHORT_GI_80
))
202 static const struct rs_tx_column rs_tx_columns
[] = {
203 [RS_COLUMN_LEGACY_ANT_A
] = {
207 RS_COLUMN_LEGACY_ANT_B
,
208 RS_COLUMN_SISO_ANT_A
,
219 [RS_COLUMN_LEGACY_ANT_B
] = {
223 RS_COLUMN_LEGACY_ANT_A
,
224 RS_COLUMN_SISO_ANT_B
,
235 [RS_COLUMN_SISO_ANT_A
] = {
239 RS_COLUMN_SISO_ANT_B
,
241 RS_COLUMN_SISO_ANT_A_SGI
,
242 RS_COLUMN_LEGACY_ANT_A
,
243 RS_COLUMN_LEGACY_ANT_B
,
252 [RS_COLUMN_SISO_ANT_B
] = {
256 RS_COLUMN_SISO_ANT_A
,
258 RS_COLUMN_SISO_ANT_B_SGI
,
259 RS_COLUMN_LEGACY_ANT_A
,
260 RS_COLUMN_LEGACY_ANT_B
,
269 [RS_COLUMN_SISO_ANT_A_SGI
] = {
274 RS_COLUMN_SISO_ANT_B_SGI
,
276 RS_COLUMN_SISO_ANT_A
,
277 RS_COLUMN_LEGACY_ANT_A
,
278 RS_COLUMN_LEGACY_ANT_B
,
288 [RS_COLUMN_SISO_ANT_B_SGI
] = {
293 RS_COLUMN_SISO_ANT_A_SGI
,
295 RS_COLUMN_SISO_ANT_B
,
296 RS_COLUMN_LEGACY_ANT_A
,
297 RS_COLUMN_LEGACY_ANT_B
,
307 [RS_COLUMN_MIMO2
] = {
311 RS_COLUMN_SISO_ANT_A
,
313 RS_COLUMN_LEGACY_ANT_A
,
314 RS_COLUMN_LEGACY_ANT_B
,
323 [RS_COLUMN_MIMO2_SGI
] = {
328 RS_COLUMN_SISO_ANT_A_SGI
,
330 RS_COLUMN_LEGACY_ANT_A
,
331 RS_COLUMN_LEGACY_ANT_B
,
343 static inline u8
rs_extract_rate(u32 rate_n_flags
)
345 /* also works for HT because bits 7:6 are zero there */
346 return (u8
)(rate_n_flags
& RATE_LEGACY_RATE_MSK
);
349 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags
)
353 if (rate_n_flags
& RATE_MCS_HT_MSK
) {
354 idx
= rate_n_flags
& RATE_HT_MCS_RATE_CODE_MSK
;
355 idx
+= IWL_RATE_MCS_0_INDEX
;
357 /* skip 9M not supported in HT*/
358 if (idx
>= IWL_RATE_9M_INDEX
)
360 if ((idx
>= IWL_FIRST_HT_RATE
) && (idx
<= IWL_LAST_HT_RATE
))
362 } else if (rate_n_flags
& RATE_MCS_VHT_MSK
) {
363 idx
= rate_n_flags
& RATE_VHT_MCS_RATE_CODE_MSK
;
364 idx
+= IWL_RATE_MCS_0_INDEX
;
366 /* skip 9M not supported in VHT*/
367 if (idx
>= IWL_RATE_9M_INDEX
)
369 if ((idx
>= IWL_FIRST_VHT_RATE
) && (idx
<= IWL_LAST_VHT_RATE
))
372 /* legacy rate format, search for match in table */
374 u8 legacy_rate
= rs_extract_rate(rate_n_flags
);
375 for (idx
= 0; idx
< ARRAY_SIZE(iwl_rates
); idx
++)
376 if (iwl_rates
[idx
].plcp
== legacy_rate
)
380 return IWL_RATE_INVALID
;
383 static void rs_rate_scale_perform(struct iwl_mvm
*mvm
,
384 struct ieee80211_sta
*sta
,
385 struct iwl_lq_sta
*lq_sta
,
387 static void rs_fill_lq_cmd(struct iwl_mvm
*mvm
,
388 struct ieee80211_sta
*sta
,
389 struct iwl_lq_sta
*lq_sta
,
390 const struct rs_rate
*initial_rate
);
391 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
, bool force_search
);
394 * The following tables contain the expected throughput metrics for all rates
396 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
398 * where invalid entries are zeros.
400 * CCK rates are only valid in legacy table and will only be used in G
404 static const u16 expected_tpt_legacy
[IWL_RATE_COUNT
] = {
405 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
408 /* Expected TpT tables. 4 indexes:
409 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
411 static const u16 expected_tpt_siso_20MHz
[4][IWL_RATE_COUNT
] = {
412 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
413 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
414 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
415 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
418 static const u16 expected_tpt_siso_40MHz
[4][IWL_RATE_COUNT
] = {
419 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
420 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
421 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
422 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
425 static const u16 expected_tpt_siso_80MHz
[4][IWL_RATE_COUNT
] = {
426 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
427 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
428 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
429 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
432 static const u16 expected_tpt_mimo2_20MHz
[4][IWL_RATE_COUNT
] = {
433 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
434 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
435 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
436 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
439 static const u16 expected_tpt_mimo2_40MHz
[4][IWL_RATE_COUNT
] = {
440 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
441 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
442 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
443 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
446 static const u16 expected_tpt_mimo2_80MHz
[4][IWL_RATE_COUNT
] = {
447 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
448 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
449 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
450 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
454 static const struct iwl_rate_mcs_info iwl_rate_mcs
[IWL_RATE_COUNT
] = {
463 { "24", "16QAM 1/2"},
464 { "36", "16QAM 3/4"},
465 { "48", "64QAM 2/3"},
466 { "54", "64QAM 3/4"},
467 { "60", "64QAM 5/6"},
470 #define MCS_INDEX_PER_STREAM (8)
472 static const char *rs_pretty_ant(u8 ant
)
474 static const char * const ant_name
[] = {
488 return ant_name
[ant
];
491 static const char *rs_pretty_lq_type(enum iwl_table_type type
)
493 static const char * const lq_types
[] = {
495 [LQ_LEGACY_A
] = "LEGACY_A",
496 [LQ_LEGACY_G
] = "LEGACY_G",
497 [LQ_HT_SISO
] = "HT SISO",
498 [LQ_HT_MIMO2
] = "HT MIMO",
499 [LQ_VHT_SISO
] = "VHT SISO",
500 [LQ_VHT_MIMO2
] = "VHT MIMO",
503 if (type
< LQ_NONE
|| type
>= LQ_MAX
)
506 return lq_types
[type
];
509 static inline void rs_dump_rate(struct iwl_mvm
*mvm
, const struct rs_rate
*rate
,
513 "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
514 prefix
, rs_pretty_lq_type(rate
->type
),
515 rate
->index
, rs_pretty_ant(rate
->ant
),
516 rate
->bw
, rate
->sgi
, rate
->ldpc
, rate
->stbc
);
519 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data
*window
)
522 window
->success_counter
= 0;
523 window
->success_ratio
= IWL_INVALID_VALUE
;
525 window
->average_tpt
= IWL_INVALID_VALUE
;
528 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm
*mvm
,
529 struct iwl_scale_tbl_info
*tbl
)
533 IWL_DEBUG_RATE(mvm
, "Clearing up window stats\n");
534 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
535 rs_rate_scale_clear_window(&tbl
->win
[i
]);
537 for (i
= 0; i
< ARRAY_SIZE(tbl
->tpc_win
); i
++)
538 rs_rate_scale_clear_window(&tbl
->tpc_win
[i
]);
541 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
543 return (ant_type
& valid_antenna
) == ant_type
;
546 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm
*mvm
,
547 struct iwl_lq_sta
*lq_data
, u8 tid
,
548 struct ieee80211_sta
*sta
)
552 IWL_DEBUG_HT(mvm
, "Starting Tx agg: STA: %pM tid: %d\n",
554 ret
= ieee80211_start_tx_ba_session(sta
, tid
, 5000);
555 if (ret
== -EAGAIN
) {
557 * driver and mac80211 is out of sync
558 * this might be cause by reloading firmware
559 * stop the tx ba session here
561 IWL_ERR(mvm
, "Fail start Tx agg on tid: %d\n",
563 ieee80211_stop_tx_ba_session(sta
, tid
);
568 static void rs_tl_turn_on_agg(struct iwl_mvm
*mvm
, u8 tid
,
569 struct iwl_lq_sta
*lq_data
,
570 struct ieee80211_sta
*sta
)
572 if (tid
< IWL_MAX_TID_COUNT
)
573 rs_tl_turn_on_agg_for_tid(mvm
, lq_data
, tid
, sta
);
575 IWL_ERR(mvm
, "tid exceeds max TID count: %d/%d\n",
576 tid
, IWL_MAX_TID_COUNT
);
579 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
581 return !!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
582 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
583 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
);
587 * Static function to get the expected throughput from an iwl_scale_tbl_info
588 * that wraps a NULL pointer check
590 static s32
get_expected_tpt(struct iwl_scale_tbl_info
*tbl
, int rs_index
)
592 if (tbl
->expected_tpt
)
593 return tbl
->expected_tpt
[rs_index
];
598 * rs_collect_tx_data - Update the success/failure sliding window
600 * We keep a sliding window of the last 62 packets transmitted
601 * at this rate. window->data contains the bitmask of successful
604 static int _rs_collect_tx_data(struct iwl_mvm
*mvm
,
605 struct iwl_scale_tbl_info
*tbl
,
606 int scale_index
, int attempts
, int successes
,
607 struct iwl_rate_scale_data
*window
)
609 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
612 /* Get expected throughput */
613 tpt
= get_expected_tpt(tbl
, scale_index
);
616 * Keep track of only the latest 62 tx frame attempts in this rate's
617 * history window; anything older isn't really relevant any more.
618 * If we have filled up the sliding window, drop the oldest attempt;
619 * if the oldest attempt (highest bit in bitmap) shows "success",
620 * subtract "1" from the success counter (this is the main reason
621 * we keep these bitmaps!).
623 while (attempts
> 0) {
624 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
625 /* remove earliest */
626 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
628 if (window
->data
& mask
) {
629 window
->data
&= ~mask
;
630 window
->success_counter
--;
634 /* Increment frames-attempted counter */
637 /* Shift bitmap by one frame to throw away oldest history */
640 /* Mark the most recent #successes attempts as successful */
642 window
->success_counter
++;
650 /* Calculate current success ratio, avoid divide-by-0! */
651 if (window
->counter
> 0)
652 window
->success_ratio
= 128 * (100 * window
->success_counter
)
655 window
->success_ratio
= IWL_INVALID_VALUE
;
657 fail_count
= window
->counter
- window
->success_counter
;
659 /* Calculate average throughput, if we have enough history. */
660 if ((fail_count
>= IWL_MVM_RS_RATE_MIN_FAILURE_TH
) ||
661 (window
->success_counter
>= IWL_MVM_RS_RATE_MIN_SUCCESS_TH
))
662 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
664 window
->average_tpt
= IWL_INVALID_VALUE
;
669 static int rs_collect_tx_data(struct iwl_mvm
*mvm
,
670 struct iwl_lq_sta
*lq_sta
,
671 struct iwl_scale_tbl_info
*tbl
,
672 int scale_index
, int attempts
, int successes
,
675 struct iwl_rate_scale_data
*window
= NULL
;
678 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
681 if (tbl
->column
!= RS_COLUMN_INVALID
) {
682 struct lq_sta_pers
*pers
= &lq_sta
->pers
;
684 pers
->tx_stats
[tbl
->column
][scale_index
].total
+= attempts
;
685 pers
->tx_stats
[tbl
->column
][scale_index
].success
+= successes
;
688 /* Select window for current tx bit rate */
689 window
= &(tbl
->win
[scale_index
]);
691 ret
= _rs_collect_tx_data(mvm
, tbl
, scale_index
, attempts
, successes
,
696 if (WARN_ON_ONCE(reduced_txp
> TPC_MAX_REDUCTION
))
699 window
= &tbl
->tpc_win
[reduced_txp
];
700 return _rs_collect_tx_data(mvm
, tbl
, scale_index
, attempts
, successes
,
704 /* Convert rs_rate object into ucode rate bitmask */
705 static u32
ucode_rate_from_rs_rate(struct iwl_mvm
*mvm
,
706 struct rs_rate
*rate
)
709 int index
= rate
->index
;
711 ucode_rate
|= ((rate
->ant
<< RATE_MCS_ANT_POS
) &
712 RATE_MCS_ANT_ABC_MSK
);
714 if (is_legacy(rate
)) {
715 ucode_rate
|= iwl_rates
[index
].plcp
;
716 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
717 ucode_rate
|= RATE_MCS_CCK_MSK
;
722 if (index
< IWL_FIRST_HT_RATE
|| index
> IWL_LAST_HT_RATE
) {
723 IWL_ERR(mvm
, "Invalid HT rate index %d\n", index
);
724 index
= IWL_LAST_HT_RATE
;
726 ucode_rate
|= RATE_MCS_HT_MSK
;
728 if (is_ht_siso(rate
))
729 ucode_rate
|= iwl_rates
[index
].plcp_ht_siso
;
730 else if (is_ht_mimo2(rate
))
731 ucode_rate
|= iwl_rates
[index
].plcp_ht_mimo2
;
734 } else if (is_vht(rate
)) {
735 if (index
< IWL_FIRST_VHT_RATE
|| index
> IWL_LAST_VHT_RATE
) {
736 IWL_ERR(mvm
, "Invalid VHT rate index %d\n", index
);
737 index
= IWL_LAST_VHT_RATE
;
739 ucode_rate
|= RATE_MCS_VHT_MSK
;
740 if (is_vht_siso(rate
))
741 ucode_rate
|= iwl_rates
[index
].plcp_vht_siso
;
742 else if (is_vht_mimo2(rate
))
743 ucode_rate
|= iwl_rates
[index
].plcp_vht_mimo2
;
748 IWL_ERR(mvm
, "Invalid rate->type %d\n", rate
->type
);
751 if (is_siso(rate
) && rate
->stbc
) {
752 /* To enable STBC we need to set both a flag and ANT_AB */
753 ucode_rate
|= RATE_MCS_ANT_AB_MSK
;
754 ucode_rate
|= RATE_MCS_VHT_STBC_MSK
;
757 ucode_rate
|= rate
->bw
;
759 ucode_rate
|= RATE_MCS_SGI_MSK
;
761 ucode_rate
|= RATE_MCS_LDPC_MSK
;
766 /* Convert a ucode rate into an rs_rate object */
767 static int rs_rate_from_ucode_rate(const u32 ucode_rate
,
768 enum ieee80211_band band
,
769 struct rs_rate
*rate
)
771 u32 ant_msk
= ucode_rate
& RATE_MCS_ANT_ABC_MSK
;
772 u8 num_of_ant
= get_num_of_ant_from_rate(ucode_rate
);
775 memset(rate
, 0, sizeof(*rate
));
776 rate
->index
= iwl_hwrate_to_plcp_idx(ucode_rate
);
778 if (rate
->index
== IWL_RATE_INVALID
)
781 rate
->ant
= (ant_msk
>> RATE_MCS_ANT_POS
);
784 if (!(ucode_rate
& RATE_MCS_HT_MSK
) &&
785 !(ucode_rate
& RATE_MCS_VHT_MSK
)) {
786 if (num_of_ant
== 1) {
787 if (band
== IEEE80211_BAND_5GHZ
)
788 rate
->type
= LQ_LEGACY_A
;
790 rate
->type
= LQ_LEGACY_G
;
797 if (ucode_rate
& RATE_MCS_SGI_MSK
)
799 if (ucode_rate
& RATE_MCS_LDPC_MSK
)
801 if (ucode_rate
& RATE_MCS_VHT_STBC_MSK
)
804 rate
->bw
= ucode_rate
& RATE_MCS_CHAN_WIDTH_MSK
;
806 if (ucode_rate
& RATE_MCS_HT_MSK
) {
807 nss
= ((ucode_rate
& RATE_HT_MCS_NSS_MSK
) >>
808 RATE_HT_MCS_NSS_POS
) + 1;
811 rate
->type
= LQ_HT_SISO
;
812 WARN_ON_ONCE(!rate
->stbc
&& num_of_ant
!= 1);
813 } else if (nss
== 2) {
814 rate
->type
= LQ_HT_MIMO2
;
815 WARN_ON_ONCE(num_of_ant
!= 2);
819 } else if (ucode_rate
& RATE_MCS_VHT_MSK
) {
820 nss
= ((ucode_rate
& RATE_VHT_MCS_NSS_MSK
) >>
821 RATE_VHT_MCS_NSS_POS
) + 1;
824 rate
->type
= LQ_VHT_SISO
;
825 WARN_ON_ONCE(!rate
->stbc
&& num_of_ant
!= 1);
826 } else if (nss
== 2) {
827 rate
->type
= LQ_VHT_MIMO2
;
828 WARN_ON_ONCE(num_of_ant
!= 2);
834 WARN_ON_ONCE(rate
->bw
== RATE_MCS_CHAN_WIDTH_160
);
835 WARN_ON_ONCE(rate
->bw
== RATE_MCS_CHAN_WIDTH_80
&&
841 /* switch to another antenna/antennas and return 1 */
842 /* if no other valid antenna found, return 0 */
843 static int rs_toggle_antenna(u32 valid_ant
, struct rs_rate
*rate
)
847 if (!rate
->ant
|| rate
->ant
> ANT_ABC
)
850 if (!rs_is_valid_ant(valid_ant
, rate
->ant
))
853 new_ant_type
= ant_toggle_lookup
[rate
->ant
];
855 while ((new_ant_type
!= rate
->ant
) &&
856 !rs_is_valid_ant(valid_ant
, new_ant_type
))
857 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
859 if (new_ant_type
== rate
->ant
)
862 rate
->ant
= new_ant_type
;
867 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
868 struct rs_rate
*rate
)
871 return lq_sta
->active_legacy_rate
;
872 else if (is_siso(rate
))
873 return lq_sta
->active_siso_rate
;
874 else if (is_mimo2(rate
))
875 return lq_sta
->active_mimo2_rate
;
881 static u16
rs_get_adjacent_rate(struct iwl_mvm
*mvm
, u8 index
, u16 rate_mask
,
884 u8 high
= IWL_RATE_INVALID
;
885 u8 low
= IWL_RATE_INVALID
;
887 /* 802.11A or ht walks to the next literal adjacent rate in
889 if (is_type_a_band(rate_type
) || !is_type_legacy(rate_type
)) {
893 /* Find the previous rate that is in the rate mask */
895 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
896 if (rate_mask
& mask
) {
902 /* Find the next rate that is in the rate mask */
904 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
905 if (rate_mask
& mask
) {
911 return (high
<< 8) | low
;
915 while (low
!= IWL_RATE_INVALID
) {
916 low
= iwl_rates
[low
].prev_rs
;
917 if (low
== IWL_RATE_INVALID
)
919 if (rate_mask
& (1 << low
))
924 while (high
!= IWL_RATE_INVALID
) {
925 high
= iwl_rates
[high
].next_rs
;
926 if (high
== IWL_RATE_INVALID
)
928 if (rate_mask
& (1 << high
))
932 return (high
<< 8) | low
;
935 static inline bool rs_rate_supported(struct iwl_lq_sta
*lq_sta
,
936 struct rs_rate
*rate
)
938 return BIT(rate
->index
) & rs_get_supported_rates(lq_sta
, rate
);
941 /* Get the next supported lower rate in the current column.
942 * Return true if bottom rate in the current column was reached
944 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta
*lq_sta
,
945 struct rs_rate
*rate
)
950 struct iwl_mvm
*mvm
= lq_sta
->pers
.drv
;
952 rate_mask
= rs_get_supported_rates(lq_sta
, rate
);
953 high_low
= rs_get_adjacent_rate(mvm
, rate
->index
, rate_mask
,
955 low
= high_low
& 0xff;
957 /* Bottom rate of column reached */
958 if (low
== IWL_RATE_INVALID
)
965 /* Get the next rate to use following a column downgrade */
966 static void rs_get_lower_rate_down_column(struct iwl_lq_sta
*lq_sta
,
967 struct rs_rate
*rate
)
969 struct iwl_mvm
*mvm
= lq_sta
->pers
.drv
;
971 if (is_legacy(rate
)) {
972 /* No column to downgrade from Legacy */
974 } else if (is_siso(rate
)) {
975 /* Downgrade to Legacy if we were in SISO */
976 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
977 rate
->type
= LQ_LEGACY_A
;
979 rate
->type
= LQ_LEGACY_G
;
981 rate
->bw
= RATE_MCS_CHAN_WIDTH_20
;
983 WARN_ON_ONCE(rate
->index
< IWL_RATE_MCS_0_INDEX
||
984 rate
->index
> IWL_RATE_MCS_9_INDEX
);
986 rate
->index
= rs_ht_to_legacy
[rate
->index
];
989 /* Downgrade to SISO with same MCS if in MIMO */
990 rate
->type
= is_vht_mimo2(rate
) ?
991 LQ_VHT_SISO
: LQ_HT_SISO
;
994 if (num_of_ant(rate
->ant
) > 1)
995 rate
->ant
= first_antenna(iwl_mvm_get_valid_tx_ant(mvm
));
997 /* Relevant in both switching to SISO or Legacy */
1000 if (!rs_rate_supported(lq_sta
, rate
))
1001 rs_get_lower_rate_in_column(lq_sta
, rate
);
1004 /* Check if both rates are identical */
1005 static inline bool rs_rate_equal(struct rs_rate
*a
,
1008 return (a
->type
== b
->type
) && (a
->bw
== b
->bw
) && (a
->sgi
== b
->sgi
) &&
1009 (a
->ldpc
== b
->ldpc
) && (a
->index
== b
->index
) &&
1013 /* Check if both rates share the same column */
1014 static inline bool rs_rate_column_match(struct rs_rate
*a
,
1020 ant_match
= (b
->ant
== ANT_A
|| b
->ant
== ANT_B
);
1022 ant_match
= (a
->ant
== b
->ant
);
1024 return (a
->type
== b
->type
) && (a
->bw
== b
->bw
) && (a
->sgi
== b
->sgi
)
1028 static u8
rs_get_tid(struct ieee80211_hdr
*hdr
)
1030 u8 tid
= IWL_MAX_TID_COUNT
;
1032 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
1033 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
1037 if (unlikely(tid
> IWL_MAX_TID_COUNT
))
1038 tid
= IWL_MAX_TID_COUNT
;
1043 void iwl_mvm_rs_tx_status(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
1044 int tid
, struct ieee80211_tx_info
*info
)
1049 struct iwl_lq_cmd
*table
;
1051 struct rs_rate lq_rate
, tx_resp_rate
;
1052 struct iwl_scale_tbl_info
*curr_tbl
, *other_tbl
, *tmp_tbl
;
1053 u8 reduced_txp
= (uintptr_t)info
->status
.status_driver_data
[0];
1054 u32 tx_resp_hwrate
= (uintptr_t)info
->status
.status_driver_data
[1];
1055 struct iwl_mvm_sta
*mvmsta
= iwl_mvm_sta_from_mac80211(sta
);
1056 struct iwl_lq_sta
*lq_sta
= &mvmsta
->lq_sta
;
1058 /* Treat uninitialized rate scaling data same as non-existing. */
1060 IWL_DEBUG_RATE(mvm
, "Station rate scaling not created yet.\n");
1062 } else if (!lq_sta
->pers
.drv
) {
1063 IWL_DEBUG_RATE(mvm
, "Rate scaling not initialized yet.\n");
1067 #ifdef CONFIG_MAC80211_DEBUGFS
1068 /* Disable last tx check if we are debugging with fixed rate */
1069 if (lq_sta
->pers
.dbg_fixed_rate
) {
1070 IWL_DEBUG_RATE(mvm
, "Fixed rate. avoid rate scaling\n");
1074 /* This packet was aggregated but doesn't carry status info */
1075 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
1076 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
1079 if (time_after(jiffies
,
1080 (unsigned long)(lq_sta
->last_tx
+
1081 (IWL_MVM_RS_IDLE_TIMEOUT
* HZ
)))) {
1084 IWL_DEBUG_RATE(mvm
, "Tx idle for too long. reinit rs\n");
1085 for (t
= 0; t
< IWL_MAX_TID_COUNT
; t
++)
1086 ieee80211_stop_tx_ba_session(sta
, t
);
1088 iwl_mvm_rs_rate_init(mvm
, sta
, info
->band
, false);
1091 lq_sta
->last_tx
= jiffies
;
1093 /* Ignore this Tx frame response if its initial rate doesn't match
1094 * that of latest Link Quality command. There may be stragglers
1095 * from a previous Link Quality command, but we're no longer interested
1096 * in those; they're either from the "active" mode while we're trying
1097 * to check "search" mode, or a prior "search" mode after we've moved
1098 * to a new "search" mode (which might become the new "active" mode).
1100 table
= &lq_sta
->lq
;
1101 lq_hwrate
= le32_to_cpu(table
->rs_table
[0]);
1102 rs_rate_from_ucode_rate(lq_hwrate
, info
->band
, &lq_rate
);
1103 rs_rate_from_ucode_rate(tx_resp_hwrate
, info
->band
, &tx_resp_rate
);
1105 /* Here we actually compare this rate to the latest LQ command */
1106 if (!rs_rate_equal(&tx_resp_rate
, &lq_rate
)) {
1108 "initial tx resp rate 0x%x does not match 0x%x\n",
1109 tx_resp_hwrate
, lq_hwrate
);
1112 * Since rates mis-match, the last LQ command may have failed.
1113 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1116 lq_sta
->missed_rate_counter
++;
1117 if (lq_sta
->missed_rate_counter
> IWL_MVM_RS_MISSED_RATE_MAX
) {
1118 lq_sta
->missed_rate_counter
= 0;
1120 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1122 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, false);
1124 /* Regardless, ignore this status info for outdated rate */
1127 /* Rate did match, so reset the missed_rate_counter */
1128 lq_sta
->missed_rate_counter
= 0;
1130 if (!lq_sta
->search_better_tbl
) {
1131 curr_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1132 other_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1134 curr_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1135 other_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1138 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate
, &curr_tbl
->rate
))) {
1140 "Neither active nor search matches tx rate\n");
1141 tmp_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1142 rs_dump_rate(mvm
, &tmp_tbl
->rate
, "ACTIVE");
1143 tmp_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1144 rs_dump_rate(mvm
, &tmp_tbl
->rate
, "SEARCH");
1145 rs_dump_rate(mvm
, &lq_rate
, "ACTUAL");
1148 * no matching table found, let's by-pass the data collection
1149 * and continue to perform rate scale to find the rate table
1151 rs_stay_in_table(lq_sta
, true);
1156 * Updating the frame history depends on whether packets were
1159 * For aggregation, all packets were transmitted at the same rate, the
1160 * first index into rate scale table.
1162 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
) {
1163 /* ampdu_ack_len = 0 marks no BA was received. In this case
1164 * treat it as a single frame loss as we don't want the success
1165 * ratio to dip too quickly because a BA wasn't received
1167 if (info
->status
.ampdu_ack_len
== 0)
1168 info
->status
.ampdu_len
= 1;
1170 rs_collect_tx_data(mvm
, lq_sta
, curr_tbl
, lq_rate
.index
,
1171 info
->status
.ampdu_len
,
1172 info
->status
.ampdu_ack_len
,
1175 /* Update success/fail counts if not searching for new mode */
1176 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
) {
1177 lq_sta
->total_success
+= info
->status
.ampdu_ack_len
;
1178 lq_sta
->total_failed
+= (info
->status
.ampdu_len
-
1179 info
->status
.ampdu_ack_len
);
1183 * For legacy, update frame history with for each Tx retry.
1185 retries
= info
->status
.rates
[0].count
- 1;
1186 /* HW doesn't send more than 15 retries */
1187 retries
= min(retries
, 15);
1189 /* The last transmission may have been successful */
1190 legacy_success
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
1191 /* Collect data for each rate used during failed TX attempts */
1192 for (i
= 0; i
<= retries
; ++i
) {
1193 lq_hwrate
= le32_to_cpu(table
->rs_table
[i
]);
1194 rs_rate_from_ucode_rate(lq_hwrate
, info
->band
,
1197 * Only collect stats if retried rate is in the same RS
1198 * table as active/search.
1200 if (rs_rate_column_match(&lq_rate
, &curr_tbl
->rate
))
1202 else if (rs_rate_column_match(&lq_rate
,
1204 tmp_tbl
= other_tbl
;
1208 rs_collect_tx_data(mvm
, lq_sta
, tmp_tbl
, lq_rate
.index
,
1209 1, 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
= lq_hwrate
;
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
->supp_rates
[info
->band
])
1225 rs_rate_scale_perform(mvm
, sta
, lq_sta
, tid
);
1229 * mac80211 sends us Tx status
1231 static void rs_mac80211_tx_status(void *mvm_r
,
1232 struct ieee80211_supported_band
*sband
,
1233 struct ieee80211_sta
*sta
, void *priv_sta
,
1234 struct sk_buff
*skb
)
1236 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1237 struct iwl_op_mode
*op_mode
= (struct iwl_op_mode
*)mvm_r
;
1238 struct iwl_mvm
*mvm
= IWL_OP_MODE_GET_MVM(op_mode
);
1239 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1241 if (!ieee80211_is_data(hdr
->frame_control
) ||
1242 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
1245 iwl_mvm_rs_tx_status(mvm
, sta
, rs_get_tid(hdr
), info
);
1249 * Begin a period of staying with a selected modulation mode.
1250 * Set "stay_in_tbl" flag to prevent any mode switches.
1251 * Set frame tx success limits according to legacy vs. high-throughput,
1252 * and reset overall (spanning all rates) tx success history statistics.
1253 * These control how long we stay using same modulation mode before
1254 * searching for a new mode.
1256 static void rs_set_stay_in_table(struct iwl_mvm
*mvm
, u8 is_legacy
,
1257 struct iwl_lq_sta
*lq_sta
)
1259 IWL_DEBUG_RATE(mvm
, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1260 lq_sta
->rs_state
= RS_STATE_STAY_IN_COLUMN
;
1262 lq_sta
->table_count_limit
= IWL_MVM_RS_LEGACY_TABLE_COUNT
;
1263 lq_sta
->max_failure_limit
= IWL_MVM_RS_LEGACY_FAILURE_LIMIT
;
1264 lq_sta
->max_success_limit
= IWL_MVM_RS_LEGACY_SUCCESS_LIMIT
;
1266 lq_sta
->table_count_limit
= IWL_MVM_RS_NON_LEGACY_TABLE_COUNT
;
1267 lq_sta
->max_failure_limit
= IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT
;
1268 lq_sta
->max_success_limit
= IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT
;
1270 lq_sta
->table_count
= 0;
1271 lq_sta
->total_failed
= 0;
1272 lq_sta
->total_success
= 0;
1273 lq_sta
->flush_timer
= jiffies
;
1274 lq_sta
->visited_columns
= 0;
1277 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask
)
1280 return find_last_bit(&rate_mask
, BITS_PER_LONG
);
1281 return IWL_RATE_INVALID
;
1284 static int rs_get_max_allowed_rate(struct iwl_lq_sta
*lq_sta
,
1285 const struct rs_tx_column
*column
)
1287 switch (column
->mode
) {
1289 return lq_sta
->max_legacy_rate_idx
;
1291 return lq_sta
->max_siso_rate_idx
;
1293 return lq_sta
->max_mimo2_rate_idx
;
1298 return lq_sta
->max_legacy_rate_idx
;
1301 static const u16
*rs_get_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1302 const struct rs_tx_column
*column
,
1305 /* Used to choose among HT tables */
1306 const u16 (*ht_tbl_pointer
)[IWL_RATE_COUNT
];
1308 if (WARN_ON_ONCE(column
->mode
!= RS_LEGACY
&&
1309 column
->mode
!= RS_SISO
&&
1310 column
->mode
!= RS_MIMO2
))
1311 return expected_tpt_legacy
;
1313 /* Legacy rates have only one table */
1314 if (column
->mode
== RS_LEGACY
)
1315 return expected_tpt_legacy
;
1317 ht_tbl_pointer
= expected_tpt_mimo2_20MHz
;
1318 /* Choose among many HT tables depending on number of streams
1319 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1321 if (column
->mode
== RS_SISO
) {
1323 case RATE_MCS_CHAN_WIDTH_20
:
1324 ht_tbl_pointer
= expected_tpt_siso_20MHz
;
1326 case RATE_MCS_CHAN_WIDTH_40
:
1327 ht_tbl_pointer
= expected_tpt_siso_40MHz
;
1329 case RATE_MCS_CHAN_WIDTH_80
:
1330 ht_tbl_pointer
= expected_tpt_siso_80MHz
;
1335 } else if (column
->mode
== RS_MIMO2
) {
1337 case RATE_MCS_CHAN_WIDTH_20
:
1338 ht_tbl_pointer
= expected_tpt_mimo2_20MHz
;
1340 case RATE_MCS_CHAN_WIDTH_40
:
1341 ht_tbl_pointer
= expected_tpt_mimo2_40MHz
;
1343 case RATE_MCS_CHAN_WIDTH_80
:
1344 ht_tbl_pointer
= expected_tpt_mimo2_80MHz
;
1353 if (!column
->sgi
&& !lq_sta
->is_agg
) /* Normal */
1354 return ht_tbl_pointer
[0];
1355 else if (column
->sgi
&& !lq_sta
->is_agg
) /* SGI */
1356 return ht_tbl_pointer
[1];
1357 else if (!column
->sgi
&& lq_sta
->is_agg
) /* AGG */
1358 return ht_tbl_pointer
[2];
1360 return ht_tbl_pointer
[3];
1363 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1364 struct iwl_scale_tbl_info
*tbl
)
1366 struct rs_rate
*rate
= &tbl
->rate
;
1367 const struct rs_tx_column
*column
= &rs_tx_columns
[tbl
->column
];
1369 tbl
->expected_tpt
= rs_get_expected_tpt_table(lq_sta
, column
, rate
->bw
);
1372 static s32
rs_get_best_rate(struct iwl_mvm
*mvm
,
1373 struct iwl_lq_sta
*lq_sta
,
1374 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1375 unsigned long rate_mask
, s8 index
)
1377 struct iwl_scale_tbl_info
*active_tbl
=
1378 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1379 s32 success_ratio
= active_tbl
->win
[index
].success_ratio
;
1380 u16 expected_current_tpt
= active_tbl
->expected_tpt
[index
];
1381 const u16
*tpt_tbl
= tbl
->expected_tpt
;
1386 if (success_ratio
> IWL_MVM_RS_SR_NO_DECREASE
) {
1387 target_tpt
= 100 * expected_current_tpt
;
1389 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1390 success_ratio
, target_tpt
);
1392 target_tpt
= lq_sta
->last_tpt
;
1394 "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1395 success_ratio
, target_tpt
);
1398 rate_idx
= find_first_bit(&rate_mask
, BITS_PER_LONG
);
1400 while (rate_idx
!= IWL_RATE_INVALID
) {
1401 if (target_tpt
< (100 * tpt_tbl
[rate_idx
]))
1404 high_low
= rs_get_adjacent_rate(mvm
, rate_idx
, rate_mask
,
1407 rate_idx
= (high_low
>> 8) & 0xff;
1410 IWL_DEBUG_RATE(mvm
, "Best rate found %d target_tp %d expected_new %d\n",
1411 rate_idx
, target_tpt
,
1412 rate_idx
!= IWL_RATE_INVALID
?
1413 100 * tpt_tbl
[rate_idx
] : IWL_INVALID_VALUE
);
1418 static u32
rs_bw_from_sta_bw(struct ieee80211_sta
*sta
)
1420 if (sta
->bandwidth
>= IEEE80211_STA_RX_BW_80
)
1421 return RATE_MCS_CHAN_WIDTH_80
;
1422 else if (sta
->bandwidth
>= IEEE80211_STA_RX_BW_40
)
1423 return RATE_MCS_CHAN_WIDTH_40
;
1425 return RATE_MCS_CHAN_WIDTH_20
;
1429 * Check whether we should continue using same modulation mode, or
1430 * begin search for a new mode, based on:
1431 * 1) # tx successes or failures while using this mode
1432 * 2) # times calling this function
1433 * 3) elapsed time in this mode (not used, for now)
1435 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
, bool force_search
)
1437 struct iwl_scale_tbl_info
*tbl
;
1439 int flush_interval_passed
= 0;
1440 struct iwl_mvm
*mvm
;
1442 mvm
= lq_sta
->pers
.drv
;
1443 active_tbl
= lq_sta
->active_tbl
;
1445 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1447 /* If we've been disallowing search, see if we should now allow it */
1448 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
) {
1449 /* Elapsed time using current modulation mode */
1450 if (lq_sta
->flush_timer
)
1451 flush_interval_passed
=
1453 (unsigned long)(lq_sta
->flush_timer
+
1454 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT
* HZ
)));
1457 * Check if we should allow search for new modulation mode.
1458 * If many frames have failed or succeeded, or we've used
1459 * this same modulation for a long time, allow search, and
1460 * reset history stats that keep track of whether we should
1461 * allow a new search. Also (below) reset all bitmaps and
1462 * stats in active history.
1465 (lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1466 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1467 ((!lq_sta
->search_better_tbl
) &&
1468 (lq_sta
->flush_timer
) && (flush_interval_passed
))) {
1470 "LQ: stay is expired %d %d %d\n",
1471 lq_sta
->total_failed
,
1472 lq_sta
->total_success
,
1473 flush_interval_passed
);
1475 /* Allow search for new mode */
1476 lq_sta
->rs_state
= RS_STATE_SEARCH_CYCLE_STARTED
;
1478 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1479 lq_sta
->total_failed
= 0;
1480 lq_sta
->total_success
= 0;
1481 lq_sta
->flush_timer
= 0;
1482 /* mark the current column as visited */
1483 lq_sta
->visited_columns
= BIT(tbl
->column
);
1485 * Else if we've used this modulation mode enough repetitions
1486 * (regardless of elapsed time or success/failure), reset
1487 * history bitmaps and rate-specific stats for all rates in
1491 lq_sta
->table_count
++;
1492 if (lq_sta
->table_count
>=
1493 lq_sta
->table_count_limit
) {
1494 lq_sta
->table_count
= 0;
1497 "LQ: stay in table clear win\n");
1498 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
1502 /* If transitioning to allow "search", reset all history
1503 * bitmaps and stats in active table (this will become the new
1504 * "search" table). */
1505 if (lq_sta
->rs_state
== RS_STATE_SEARCH_CYCLE_STARTED
) {
1506 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
1512 * setup rate table in uCode
1514 static void rs_update_rate_tbl(struct iwl_mvm
*mvm
,
1515 struct ieee80211_sta
*sta
,
1516 struct iwl_lq_sta
*lq_sta
,
1517 struct rs_rate
*rate
)
1519 rs_fill_lq_cmd(mvm
, sta
, lq_sta
, rate
);
1520 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, false);
1523 static enum rs_column
rs_get_next_column(struct iwl_mvm
*mvm
,
1524 struct iwl_lq_sta
*lq_sta
,
1525 struct ieee80211_sta
*sta
,
1526 struct iwl_scale_tbl_info
*tbl
)
1529 enum rs_column next_col_id
;
1530 const struct rs_tx_column
*curr_col
= &rs_tx_columns
[tbl
->column
];
1531 const struct rs_tx_column
*next_col
;
1532 allow_column_func_t allow_func
;
1533 u8 valid_ants
= iwl_mvm_get_valid_tx_ant(mvm
);
1534 const u16
*expected_tpt_tbl
;
1535 u16 tpt
, max_expected_tpt
;
1537 for (i
= 0; i
< MAX_NEXT_COLUMNS
; i
++) {
1538 next_col_id
= curr_col
->next_columns
[i
];
1540 if (next_col_id
== RS_COLUMN_INVALID
)
1543 if (lq_sta
->visited_columns
& BIT(next_col_id
)) {
1544 IWL_DEBUG_RATE(mvm
, "Skip already visited column %d\n",
1549 next_col
= &rs_tx_columns
[next_col_id
];
1551 if (!rs_is_valid_ant(valid_ants
, next_col
->ant
)) {
1553 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1554 next_col_id
, valid_ants
, next_col
->ant
);
1558 for (j
= 0; j
< MAX_COLUMN_CHECKS
; j
++) {
1559 allow_func
= next_col
->checks
[j
];
1560 if (allow_func
&& !allow_func(mvm
, sta
, tbl
))
1564 if (j
!= MAX_COLUMN_CHECKS
) {
1566 "Skip column %d: not allowed (check %d failed)\n",
1572 tpt
= lq_sta
->last_tpt
/ 100;
1573 expected_tpt_tbl
= rs_get_expected_tpt_table(lq_sta
, next_col
,
1574 rs_bw_from_sta_bw(sta
));
1575 if (WARN_ON_ONCE(!expected_tpt_tbl
))
1578 max_rate
= rs_get_max_allowed_rate(lq_sta
, next_col
);
1579 if (max_rate
== IWL_RATE_INVALID
) {
1581 "Skip column %d: no rate is allowed in this column\n",
1586 max_expected_tpt
= expected_tpt_tbl
[max_rate
];
1587 if (tpt
>= max_expected_tpt
) {
1589 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1590 next_col_id
, max_expected_tpt
, tpt
);
1595 "Found potential column %d. Max expected %d current %d\n",
1596 next_col_id
, max_expected_tpt
, tpt
);
1600 if (i
== MAX_NEXT_COLUMNS
)
1601 return RS_COLUMN_INVALID
;
1606 static int rs_switch_to_column(struct iwl_mvm
*mvm
,
1607 struct iwl_lq_sta
*lq_sta
,
1608 struct ieee80211_sta
*sta
,
1609 enum rs_column col_id
)
1611 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1612 struct iwl_scale_tbl_info
*search_tbl
=
1613 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1614 struct rs_rate
*rate
= &search_tbl
->rate
;
1615 const struct rs_tx_column
*column
= &rs_tx_columns
[col_id
];
1616 const struct rs_tx_column
*curr_column
= &rs_tx_columns
[tbl
->column
];
1617 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1618 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1619 unsigned long rate_mask
= 0;
1622 memcpy(search_tbl
, tbl
, sz
);
1624 rate
->sgi
= column
->sgi
;
1625 rate
->ant
= column
->ant
;
1627 if (column
->mode
== RS_LEGACY
) {
1628 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1629 rate
->type
= LQ_LEGACY_A
;
1631 rate
->type
= LQ_LEGACY_G
;
1633 rate
->bw
= RATE_MCS_CHAN_WIDTH_20
;
1635 rate_mask
= lq_sta
->active_legacy_rate
;
1636 } else if (column
->mode
== RS_SISO
) {
1637 rate
->type
= lq_sta
->is_vht
? LQ_VHT_SISO
: LQ_HT_SISO
;
1638 rate_mask
= lq_sta
->active_siso_rate
;
1639 } else if (column
->mode
== RS_MIMO2
) {
1640 rate
->type
= lq_sta
->is_vht
? LQ_VHT_MIMO2
: LQ_HT_MIMO2
;
1641 rate_mask
= lq_sta
->active_mimo2_rate
;
1643 WARN_ON_ONCE("Bad column mode");
1646 if (column
->mode
!= RS_LEGACY
) {
1647 rate
->bw
= rs_bw_from_sta_bw(sta
);
1648 rate
->ldpc
= lq_sta
->ldpc
;
1651 search_tbl
->column
= col_id
;
1652 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1654 lq_sta
->visited_columns
|= BIT(col_id
);
1656 /* Get the best matching rate if we're changing modes. e.g.
1657 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1659 if (curr_column
->mode
!= column
->mode
) {
1660 rate_idx
= rs_get_best_rate(mvm
, lq_sta
, search_tbl
,
1661 rate_mask
, rate
->index
);
1663 if ((rate_idx
== IWL_RATE_INVALID
) ||
1664 !(BIT(rate_idx
) & rate_mask
)) {
1666 "can not switch with index %d"
1668 rate_idx
, rate_mask
);
1673 rate
->index
= rate_idx
;
1676 IWL_DEBUG_RATE(mvm
, "Switched to column %d: Index %d\n",
1677 col_id
, rate
->index
);
1682 rate
->type
= LQ_NONE
;
1686 static enum rs_action
rs_get_rate_action(struct iwl_mvm
*mvm
,
1687 struct iwl_scale_tbl_info
*tbl
,
1688 s32 sr
, int low
, int high
,
1690 int low_tpt
, int high_tpt
)
1692 enum rs_action action
= RS_ACTION_STAY
;
1694 if ((sr
<= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE
)) ||
1695 (current_tpt
== 0)) {
1697 "Decrease rate because of low SR\n");
1698 return RS_ACTION_DOWNSCALE
;
1701 if ((low_tpt
== IWL_INVALID_VALUE
) &&
1702 (high_tpt
== IWL_INVALID_VALUE
) &&
1703 (high
!= IWL_RATE_INVALID
)) {
1705 "No data about high/low rates. Increase rate\n");
1706 return RS_ACTION_UPSCALE
;
1709 if ((high_tpt
== IWL_INVALID_VALUE
) &&
1710 (high
!= IWL_RATE_INVALID
) &&
1711 (low_tpt
!= IWL_INVALID_VALUE
) &&
1712 (low_tpt
< current_tpt
)) {
1714 "No data about high rate and low rate is worse. Increase rate\n");
1715 return RS_ACTION_UPSCALE
;
1718 if ((high_tpt
!= IWL_INVALID_VALUE
) &&
1719 (high_tpt
> current_tpt
)) {
1721 "Higher rate is better. Increate rate\n");
1722 return RS_ACTION_UPSCALE
;
1725 if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1726 (high_tpt
!= IWL_INVALID_VALUE
) &&
1727 (low_tpt
< current_tpt
) &&
1728 (high_tpt
< current_tpt
)) {
1730 "Both high and low are worse. Maintain rate\n");
1731 return RS_ACTION_STAY
;
1734 if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1735 (low_tpt
> current_tpt
)) {
1737 "Lower rate is better\n");
1738 action
= RS_ACTION_DOWNSCALE
;
1742 if ((low_tpt
== IWL_INVALID_VALUE
) &&
1743 (low
!= IWL_RATE_INVALID
)) {
1745 "No data about lower rate\n");
1746 action
= RS_ACTION_DOWNSCALE
;
1750 IWL_DEBUG_RATE(mvm
, "Maintain rate\n");
1753 if ((action
== RS_ACTION_DOWNSCALE
) && (low
!= IWL_RATE_INVALID
)) {
1754 if (sr
>= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE
)) {
1756 "SR is above NO DECREASE. Avoid downscale\n");
1757 action
= RS_ACTION_STAY
;
1758 } else if (current_tpt
> (100 * tbl
->expected_tpt
[low
])) {
1760 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1761 action
= RS_ACTION_STAY
;
1763 IWL_DEBUG_RATE(mvm
, "Decrease rate\n");
1770 static bool rs_stbc_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
1771 struct iwl_lq_sta
*lq_sta
)
1773 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1774 * supports STBC of at least 1*SS
1776 if (!lq_sta
->stbc_capable
)
1779 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
))
1785 static void rs_get_adjacent_txp(struct iwl_mvm
*mvm
, int index
,
1786 int *weaker
, int *stronger
)
1788 *weaker
= index
+ IWL_MVM_RS_TPC_TX_POWER_STEP
;
1789 if (*weaker
> TPC_MAX_REDUCTION
)
1790 *weaker
= TPC_INVALID
;
1792 *stronger
= index
- IWL_MVM_RS_TPC_TX_POWER_STEP
;
1794 *stronger
= TPC_INVALID
;
1797 static bool rs_tpc_allowed(struct iwl_mvm
*mvm
, struct ieee80211_vif
*vif
,
1798 struct rs_rate
*rate
, enum ieee80211_band band
)
1800 int index
= rate
->index
;
1801 bool cam
= (iwlmvm_mod_params
.power_scheme
== IWL_POWER_SCHEME_CAM
);
1802 bool sta_ps_disabled
= (vif
->type
== NL80211_IFTYPE_STATION
&&
1805 IWL_DEBUG_RATE(mvm
, "cam: %d sta_ps_disabled %d\n",
1806 cam
, sta_ps_disabled
);
1808 * allow tpc only if power management is enabled, or bt coex
1809 * activity grade allows it and we are on 2.4Ghz.
1811 if ((cam
|| sta_ps_disabled
) &&
1812 !iwl_mvm_bt_coex_is_tpc_allowed(mvm
, band
))
1815 IWL_DEBUG_RATE(mvm
, "check rate, table type: %d\n", rate
->type
);
1816 if (is_legacy(rate
))
1817 return index
== IWL_RATE_54M_INDEX
;
1819 return index
== IWL_RATE_MCS_7_INDEX
;
1821 return index
== IWL_RATE_MCS_7_INDEX
||
1822 index
== IWL_RATE_MCS_8_INDEX
||
1823 index
== IWL_RATE_MCS_9_INDEX
;
1831 TPC_ACTION_DECREASE
,
1832 TPC_ACTION_INCREASE
,
1833 TPC_ACTION_NO_RESTIRCTION
,
1836 static enum tpc_action
rs_get_tpc_action(struct iwl_mvm
*mvm
,
1837 s32 sr
, int weak
, int strong
,
1839 int weak_tpt
, int strong_tpt
)
1841 /* stay until we have valid tpt */
1842 if (current_tpt
== IWL_INVALID_VALUE
) {
1843 IWL_DEBUG_RATE(mvm
, "no current tpt. stay.\n");
1844 return TPC_ACTION_STAY
;
1847 /* Too many failures, increase txp */
1848 if (sr
<= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE
) ||
1850 IWL_DEBUG_RATE(mvm
, "increase txp because of weak SR\n");
1851 return TPC_ACTION_NO_RESTIRCTION
;
1854 /* try decreasing first if applicable */
1855 if (weak
!= TPC_INVALID
) {
1856 if (weak_tpt
== IWL_INVALID_VALUE
&&
1857 (strong_tpt
== IWL_INVALID_VALUE
||
1858 current_tpt
>= strong_tpt
)) {
1860 "no weak txp measurement. decrease txp\n");
1861 return TPC_ACTION_DECREASE
;
1864 if (weak_tpt
> current_tpt
) {
1866 "lower txp has better tpt. decrease txp\n");
1867 return TPC_ACTION_DECREASE
;
1871 /* next, increase if needed */
1872 if (sr
< RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE
) &&
1873 strong
!= TPC_INVALID
) {
1874 if (weak_tpt
== IWL_INVALID_VALUE
&&
1875 strong_tpt
!= IWL_INVALID_VALUE
&&
1876 current_tpt
< strong_tpt
) {
1878 "higher txp has better tpt. increase txp\n");
1879 return TPC_ACTION_INCREASE
;
1882 if (weak_tpt
< current_tpt
&&
1883 (strong_tpt
== IWL_INVALID_VALUE
||
1884 strong_tpt
> current_tpt
)) {
1886 "lower txp has worse tpt. increase txp\n");
1887 return TPC_ACTION_INCREASE
;
1891 IWL_DEBUG_RATE(mvm
, "no need to increase or decrease txp - stay\n");
1892 return TPC_ACTION_STAY
;
1895 static bool rs_tpc_perform(struct iwl_mvm
*mvm
,
1896 struct ieee80211_sta
*sta
,
1897 struct iwl_lq_sta
*lq_sta
,
1898 struct iwl_scale_tbl_info
*tbl
)
1900 struct iwl_mvm_sta
*mvm_sta
= iwl_mvm_sta_from_mac80211(sta
);
1901 struct ieee80211_vif
*vif
= mvm_sta
->vif
;
1902 struct ieee80211_chanctx_conf
*chanctx_conf
;
1903 enum ieee80211_band band
;
1904 struct iwl_rate_scale_data
*window
;
1905 struct rs_rate
*rate
= &tbl
->rate
;
1906 enum tpc_action action
;
1908 u8 cur
= lq_sta
->lq
.reduced_tpc
;
1911 int weak_tpt
= IWL_INVALID_VALUE
, strong_tpt
= IWL_INVALID_VALUE
;
1913 #ifdef CONFIG_MAC80211_DEBUGFS
1914 if (lq_sta
->pers
.dbg_fixed_txp_reduction
<= TPC_MAX_REDUCTION
) {
1915 IWL_DEBUG_RATE(mvm
, "fixed tpc: %d\n",
1916 lq_sta
->pers
.dbg_fixed_txp_reduction
);
1917 lq_sta
->lq
.reduced_tpc
= lq_sta
->pers
.dbg_fixed_txp_reduction
;
1918 return cur
!= lq_sta
->pers
.dbg_fixed_txp_reduction
;
1923 chanctx_conf
= rcu_dereference(vif
->chanctx_conf
);
1924 if (WARN_ON(!chanctx_conf
))
1925 band
= IEEE80211_NUM_BANDS
;
1927 band
= chanctx_conf
->def
.chan
->band
;
1930 if (!rs_tpc_allowed(mvm
, vif
, rate
, band
)) {
1932 "tpc is not allowed. remove txp restrictions\n");
1933 lq_sta
->lq
.reduced_tpc
= TPC_NO_REDUCTION
;
1934 return cur
!= TPC_NO_REDUCTION
;
1937 rs_get_adjacent_txp(mvm
, cur
, &weak
, &strong
);
1939 /* Collect measured throughputs for current and adjacent rates */
1940 window
= tbl
->tpc_win
;
1941 sr
= window
[cur
].success_ratio
;
1942 current_tpt
= window
[cur
].average_tpt
;
1943 if (weak
!= TPC_INVALID
)
1944 weak_tpt
= window
[weak
].average_tpt
;
1945 if (strong
!= TPC_INVALID
)
1946 strong_tpt
= window
[strong
].average_tpt
;
1949 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1950 cur
, current_tpt
, sr
, weak
, strong
,
1951 weak_tpt
, strong_tpt
);
1953 action
= rs_get_tpc_action(mvm
, sr
, weak
, strong
,
1954 current_tpt
, weak_tpt
, strong_tpt
);
1956 /* override actions if we are on the edge */
1957 if (weak
== TPC_INVALID
&& action
== TPC_ACTION_DECREASE
) {
1958 IWL_DEBUG_RATE(mvm
, "already in lowest txp, stay\n");
1959 action
= TPC_ACTION_STAY
;
1960 } else if (strong
== TPC_INVALID
&&
1961 (action
== TPC_ACTION_INCREASE
||
1962 action
== TPC_ACTION_NO_RESTIRCTION
)) {
1963 IWL_DEBUG_RATE(mvm
, "already in highest txp, stay\n");
1964 action
= TPC_ACTION_STAY
;
1968 case TPC_ACTION_DECREASE
:
1969 lq_sta
->lq
.reduced_tpc
= weak
;
1971 case TPC_ACTION_INCREASE
:
1972 lq_sta
->lq
.reduced_tpc
= strong
;
1974 case TPC_ACTION_NO_RESTIRCTION
:
1975 lq_sta
->lq
.reduced_tpc
= TPC_NO_REDUCTION
;
1977 case TPC_ACTION_STAY
:
1985 * Do rate scaling and search for new modulation mode.
1987 static void rs_rate_scale_perform(struct iwl_mvm
*mvm
,
1988 struct ieee80211_sta
*sta
,
1989 struct iwl_lq_sta
*lq_sta
,
1992 int low
= IWL_RATE_INVALID
;
1993 int high
= IWL_RATE_INVALID
;
1995 struct iwl_rate_scale_data
*window
= NULL
;
1996 int current_tpt
= IWL_INVALID_VALUE
;
1997 int low_tpt
= IWL_INVALID_VALUE
;
1998 int high_tpt
= IWL_INVALID_VALUE
;
2000 enum rs_action scale_action
= RS_ACTION_STAY
;
2003 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
2008 u8 prev_agg
= lq_sta
->is_agg
;
2009 struct iwl_mvm_sta
*sta_priv
= iwl_mvm_sta_from_mac80211(sta
);
2010 struct iwl_mvm_tid_data
*tid_data
;
2011 struct rs_rate
*rate
;
2013 lq_sta
->is_agg
= !!sta_priv
->agg_tids
;
2016 * Select rate-scale / modulation-mode table to work with in
2017 * the rest of this function: "search" if searching for better
2018 * modulation mode, or "active" if doing rate scaling within a mode.
2020 if (!lq_sta
->search_better_tbl
)
2021 active_tbl
= lq_sta
->active_tbl
;
2023 active_tbl
= 1 - lq_sta
->active_tbl
;
2025 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2028 if (prev_agg
!= lq_sta
->is_agg
) {
2030 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2031 prev_agg
, lq_sta
->is_agg
);
2032 rs_set_expected_tpt_table(lq_sta
, tbl
);
2033 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
2036 /* current tx rate */
2037 index
= lq_sta
->last_txrate_idx
;
2039 /* rates available for this association, and for modulation mode */
2040 rate_mask
= rs_get_supported_rates(lq_sta
, rate
);
2042 if (!(BIT(index
) & rate_mask
)) {
2043 IWL_ERR(mvm
, "Current Rate is not valid\n");
2044 if (lq_sta
->search_better_tbl
) {
2045 /* revert to active table if search table is not valid*/
2046 rate
->type
= LQ_NONE
;
2047 lq_sta
->search_better_tbl
= 0;
2048 tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2049 rs_update_rate_tbl(mvm
, sta
, lq_sta
, &tbl
->rate
);
2054 /* Get expected throughput table and history window for current rate */
2055 if (!tbl
->expected_tpt
) {
2056 IWL_ERR(mvm
, "tbl->expected_tpt is NULL\n");
2060 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2061 window
= &(tbl
->win
[index
]);
2064 * If there is not enough history to calculate actual average
2065 * throughput, keep analyzing results of more tx frames, without
2066 * changing rate or mode (bypass most of the rest of this function).
2067 * Set up new rate table in uCode only if old rate is not supported
2068 * in current association (use new rate found above).
2070 fail_count
= window
->counter
- window
->success_counter
;
2071 if ((fail_count
< IWL_MVM_RS_RATE_MIN_FAILURE_TH
) &&
2072 (window
->success_counter
< IWL_MVM_RS_RATE_MIN_SUCCESS_TH
)) {
2074 "(%s: %d): Test Window: succ %d total %d\n",
2075 rs_pretty_lq_type(rate
->type
),
2076 index
, window
->success_counter
, window
->counter
);
2078 /* Can't calculate this yet; not enough history */
2079 window
->average_tpt
= IWL_INVALID_VALUE
;
2081 /* Should we stay with this modulation mode,
2082 * or search for a new one? */
2083 rs_stay_in_table(lq_sta
, false);
2087 /* Else we have enough samples; calculate estimate of
2088 * actual average throughput */
2089 if (window
->average_tpt
!= ((window
->success_ratio
*
2090 tbl
->expected_tpt
[index
] + 64) / 128)) {
2091 window
->average_tpt
= ((window
->success_ratio
*
2092 tbl
->expected_tpt
[index
] + 64) / 128);
2095 /* If we are searching for better modulation mode, check success. */
2096 if (lq_sta
->search_better_tbl
) {
2097 /* If good success, continue using the "search" mode;
2098 * no need to send new link quality command, since we're
2099 * continuing to use the setup that we've been trying. */
2100 if (window
->average_tpt
> lq_sta
->last_tpt
) {
2102 "SWITCHING TO NEW TABLE SR: %d "
2103 "cur-tpt %d old-tpt %d\n",
2104 window
->success_ratio
,
2105 window
->average_tpt
,
2108 /* Swap tables; "search" becomes "active" */
2109 lq_sta
->active_tbl
= active_tbl
;
2110 current_tpt
= window
->average_tpt
;
2111 /* Else poor success; go back to mode in "active" table */
2114 "GOING BACK TO THE OLD TABLE: SR %d "
2115 "cur-tpt %d old-tpt %d\n",
2116 window
->success_ratio
,
2117 window
->average_tpt
,
2120 /* Nullify "search" table */
2121 rate
->type
= LQ_NONE
;
2123 /* Revert to "active" table */
2124 active_tbl
= lq_sta
->active_tbl
;
2125 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2127 /* Revert to "active" rate and throughput info */
2128 index
= tbl
->rate
.index
;
2129 current_tpt
= lq_sta
->last_tpt
;
2131 /* Need to set up a new rate table in uCode */
2135 /* Either way, we've made a decision; modulation mode
2136 * search is done, allow rate adjustment next time. */
2137 lq_sta
->search_better_tbl
= 0;
2138 done_search
= 1; /* Don't switch modes below! */
2142 /* (Else) not in search of better modulation mode, try for better
2143 * starting rate, while staying in this mode. */
2144 high_low
= rs_get_adjacent_rate(mvm
, index
, rate_mask
, rate
->type
);
2145 low
= high_low
& 0xff;
2146 high
= (high_low
>> 8) & 0xff;
2148 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2150 sr
= window
->success_ratio
;
2152 /* Collect measured throughputs for current and adjacent rates */
2153 current_tpt
= window
->average_tpt
;
2154 if (low
!= IWL_RATE_INVALID
)
2155 low_tpt
= tbl
->win
[low
].average_tpt
;
2156 if (high
!= IWL_RATE_INVALID
)
2157 high_tpt
= tbl
->win
[high
].average_tpt
;
2160 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2161 rs_pretty_lq_type(rate
->type
), index
, current_tpt
, sr
,
2162 low
, high
, low_tpt
, high_tpt
);
2164 scale_action
= rs_get_rate_action(mvm
, tbl
, sr
, low
, high
,
2165 current_tpt
, low_tpt
, high_tpt
);
2167 /* Force a search in case BT doesn't like us being in MIMO */
2168 if (is_mimo(rate
) &&
2169 !iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
)) {
2171 "BT Coex forbids MIMO. Search for new config\n");
2172 rs_stay_in_table(lq_sta
, true);
2176 switch (scale_action
) {
2177 case RS_ACTION_DOWNSCALE
:
2178 /* Decrease starting rate, update uCode's rate table */
2179 if (low
!= IWL_RATE_INVALID
) {
2184 "At the bottom rate. Can't decrease\n");
2188 case RS_ACTION_UPSCALE
:
2189 /* Increase starting rate, update uCode's rate table */
2190 if (high
!= IWL_RATE_INVALID
) {
2195 "At the top rate. Can't increase\n");
2199 case RS_ACTION_STAY
:
2201 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
)
2202 update_lq
= rs_tpc_perform(mvm
, sta
, lq_sta
, tbl
);
2209 /* Replace uCode's rate table for the destination station. */
2211 tbl
->rate
.index
= index
;
2212 rs_update_rate_tbl(mvm
, sta
, lq_sta
, &tbl
->rate
);
2215 rs_stay_in_table(lq_sta
, false);
2218 * Search for new modulation mode if we're:
2219 * 1) Not changing rates right now
2220 * 2) Not just finishing up a search
2221 * 3) Allowing a new search
2223 if (!update_lq
&& !done_search
&&
2224 lq_sta
->rs_state
== RS_STATE_SEARCH_CYCLE_STARTED
2225 && window
->counter
) {
2226 enum rs_column next_column
;
2228 /* Save current throughput to compare with "search" throughput*/
2229 lq_sta
->last_tpt
= current_tpt
;
2232 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2233 update_lq
, done_search
, lq_sta
->rs_state
,
2236 next_column
= rs_get_next_column(mvm
, lq_sta
, sta
, tbl
);
2237 if (next_column
!= RS_COLUMN_INVALID
) {
2238 int ret
= rs_switch_to_column(mvm
, lq_sta
, sta
,
2241 lq_sta
->search_better_tbl
= 1;
2244 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2245 lq_sta
->rs_state
= RS_STATE_SEARCH_CYCLE_ENDED
;
2248 /* If new "search" mode was selected, set up in uCode table */
2249 if (lq_sta
->search_better_tbl
) {
2250 /* Access the "search" table, clear its history. */
2251 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2252 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
2254 /* Use new "search" start rate */
2255 index
= tbl
->rate
.index
;
2257 rs_dump_rate(mvm
, &tbl
->rate
,
2258 "Switch to SEARCH TABLE:");
2259 rs_fill_lq_cmd(mvm
, sta
, lq_sta
, &tbl
->rate
);
2260 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, false);
2266 if (done_search
&& lq_sta
->rs_state
== RS_STATE_SEARCH_CYCLE_ENDED
) {
2267 /* If the "active" (non-search) mode was legacy,
2268 * and we've tried switching antennas,
2269 * but we haven't been able to try HT modes (not available),
2270 * stay with best antenna legacy modulation for a while
2271 * before next round of mode comparisons. */
2272 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2273 if (is_legacy(&tbl1
->rate
)) {
2274 IWL_DEBUG_RATE(mvm
, "LQ: STAY in legacy table\n");
2276 if (tid
!= IWL_MAX_TID_COUNT
) {
2277 tid_data
= &sta_priv
->tid_data
[tid
];
2278 if (tid_data
->state
!= IWL_AGG_OFF
) {
2280 "Stop aggregation on tid %d\n",
2282 ieee80211_stop_tx_ba_session(sta
, tid
);
2285 rs_set_stay_in_table(mvm
, 1, lq_sta
);
2287 /* If we're in an HT mode, and all 3 mode switch actions
2288 * have been tried and compared, stay in this best modulation
2289 * mode for a while before next round of mode comparisons. */
2290 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2291 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2292 (tid
!= IWL_MAX_TID_COUNT
)) {
2293 tid_data
= &sta_priv
->tid_data
[tid
];
2294 if (tid_data
->state
== IWL_AGG_OFF
) {
2296 "try to aggregate tid %d\n",
2298 rs_tl_turn_on_agg(mvm
, tid
,
2302 rs_set_stay_in_table(mvm
, 0, lq_sta
);
2307 lq_sta
->last_txrate_idx
= index
;
2310 struct rs_init_rate_info
{
2315 static const struct rs_init_rate_info rs_init_rates_24ghz
[] = {
2316 { -60, IWL_RATE_54M_INDEX
},
2317 { -64, IWL_RATE_48M_INDEX
},
2318 { -68, IWL_RATE_36M_INDEX
},
2319 { -80, IWL_RATE_24M_INDEX
},
2320 { -84, IWL_RATE_18M_INDEX
},
2321 { -85, IWL_RATE_12M_INDEX
},
2322 { -86, IWL_RATE_11M_INDEX
},
2323 { -88, IWL_RATE_5M_INDEX
},
2324 { -90, IWL_RATE_2M_INDEX
},
2325 { S8_MIN
, IWL_RATE_1M_INDEX
},
2328 static const struct rs_init_rate_info rs_init_rates_5ghz
[] = {
2329 { -60, IWL_RATE_54M_INDEX
},
2330 { -64, IWL_RATE_48M_INDEX
},
2331 { -72, IWL_RATE_36M_INDEX
},
2332 { -80, IWL_RATE_24M_INDEX
},
2333 { -84, IWL_RATE_18M_INDEX
},
2334 { -85, IWL_RATE_12M_INDEX
},
2335 { -87, IWL_RATE_9M_INDEX
},
2336 { S8_MIN
, IWL_RATE_6M_INDEX
},
2339 /* Choose an initial legacy rate and antenna to use based on the RSSI
2342 static void rs_get_initial_rate(struct iwl_mvm
*mvm
,
2343 struct iwl_lq_sta
*lq_sta
,
2344 enum ieee80211_band band
,
2345 struct rs_rate
*rate
)
2348 s8 best_rssi
= S8_MIN
;
2349 u8 best_ant
= ANT_NONE
;
2350 u8 valid_tx_ant
= iwl_mvm_get_valid_tx_ant(mvm
);
2351 const struct rs_init_rate_info
*initial_rates
;
2353 for (i
= 0; i
< ARRAY_SIZE(lq_sta
->pers
.chain_signal
); i
++) {
2354 if (!(lq_sta
->pers
.chains
& BIT(i
)))
2357 if (lq_sta
->pers
.chain_signal
[i
] > best_rssi
) {
2358 best_rssi
= lq_sta
->pers
.chain_signal
[i
];
2363 IWL_DEBUG_RATE(mvm
, "Best ANT: %s Best RSSI: %d\n",
2364 rs_pretty_ant(best_ant
), best_rssi
);
2366 if (best_ant
!= ANT_A
&& best_ant
!= ANT_B
)
2367 rate
->ant
= first_antenna(valid_tx_ant
);
2369 rate
->ant
= best_ant
;
2373 rate
->bw
= RATE_MCS_CHAN_WIDTH_20
;
2375 rate
->index
= find_first_bit(&lq_sta
->active_legacy_rate
,
2378 if (band
== IEEE80211_BAND_5GHZ
) {
2379 rate
->type
= LQ_LEGACY_A
;
2380 initial_rates
= rs_init_rates_5ghz
;
2381 nentries
= ARRAY_SIZE(rs_init_rates_5ghz
);
2383 rate
->type
= LQ_LEGACY_G
;
2384 initial_rates
= rs_init_rates_24ghz
;
2385 nentries
= ARRAY_SIZE(rs_init_rates_24ghz
);
2388 if (IWL_MVM_RS_RSSI_BASED_INIT_RATE
) {
2389 for (i
= 0; i
< nentries
; i
++) {
2390 int rate_idx
= initial_rates
[i
].rate_idx
;
2391 if ((best_rssi
>= initial_rates
[i
].rssi
) &&
2392 (BIT(rate_idx
) & lq_sta
->active_legacy_rate
)) {
2393 rate
->index
= rate_idx
;
2399 IWL_DEBUG_RATE(mvm
, "rate_idx %d ANT %s\n", rate
->index
,
2400 rs_pretty_ant(rate
->ant
));
2403 /* Save info about RSSI of last Rx */
2404 void rs_update_last_rssi(struct iwl_mvm
*mvm
,
2405 struct iwl_lq_sta
*lq_sta
,
2406 struct ieee80211_rx_status
*rx_status
)
2408 lq_sta
->pers
.chains
= rx_status
->chains
;
2409 lq_sta
->pers
.chain_signal
[0] = rx_status
->chain_signal
[0];
2410 lq_sta
->pers
.chain_signal
[1] = rx_status
->chain_signal
[1];
2411 lq_sta
->pers
.chain_signal
[2] = rx_status
->chain_signal
[2];
2415 * rs_initialize_lq - Initialize a station's hardware rate table
2417 * The uCode's station table contains a table of fallback rates
2418 * for automatic fallback during transmission.
2420 * NOTE: This sets up a default set of values. These will be replaced later
2421 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2424 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2425 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2426 * which requires station table entry to exist).
2428 static void rs_initialize_lq(struct iwl_mvm
*mvm
,
2429 struct ieee80211_sta
*sta
,
2430 struct iwl_lq_sta
*lq_sta
,
2431 enum ieee80211_band band
,
2434 struct iwl_scale_tbl_info
*tbl
;
2435 struct rs_rate
*rate
;
2438 if (!sta
|| !lq_sta
)
2441 if (!lq_sta
->search_better_tbl
)
2442 active_tbl
= lq_sta
->active_tbl
;
2444 active_tbl
= 1 - lq_sta
->active_tbl
;
2446 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2449 rs_get_initial_rate(mvm
, lq_sta
, band
, rate
);
2450 lq_sta
->last_txrate_idx
= rate
->index
;
2452 WARN_ON_ONCE(rate
->ant
!= ANT_A
&& rate
->ant
!= ANT_B
);
2453 if (rate
->ant
== ANT_A
)
2454 tbl
->column
= RS_COLUMN_LEGACY_ANT_A
;
2456 tbl
->column
= RS_COLUMN_LEGACY_ANT_B
;
2458 rs_set_expected_tpt_table(lq_sta
, tbl
);
2459 rs_fill_lq_cmd(mvm
, sta
, lq_sta
, rate
);
2460 /* TODO restore station should remember the lq cmd */
2461 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, init
);
2464 static void rs_get_rate(void *mvm_r
, struct ieee80211_sta
*sta
, void *mvm_sta
,
2465 struct ieee80211_tx_rate_control
*txrc
)
2467 struct sk_buff
*skb
= txrc
->skb
;
2468 struct iwl_op_mode
*op_mode __maybe_unused
=
2469 (struct iwl_op_mode
*)mvm_r
;
2470 struct iwl_mvm
*mvm __maybe_unused
= IWL_OP_MODE_GET_MVM(op_mode
);
2471 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2472 struct iwl_lq_sta
*lq_sta
= mvm_sta
;
2474 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2476 /* Treat uninitialized rate scaling data same as non-existing. */
2477 if (lq_sta
&& !lq_sta
->pers
.drv
) {
2478 IWL_DEBUG_RATE(mvm
, "Rate scaling not initialized yet.\n");
2482 /* Send management frames and NO_ACK data using lowest rate. */
2483 if (rate_control_send_low(sta
, mvm_sta
, txrc
))
2486 iwl_mvm_hwrate_to_tx_rate(lq_sta
->last_rate_n_flags
,
2487 info
->band
, &info
->control
.rates
[0]);
2489 info
->control
.rates
[0].count
= 1;
2492 static void *rs_alloc_sta(void *mvm_rate
, struct ieee80211_sta
*sta
,
2495 struct iwl_mvm_sta
*sta_priv
= iwl_mvm_sta_from_mac80211(sta
);
2496 struct iwl_op_mode
*op_mode
= (struct iwl_op_mode
*)mvm_rate
;
2497 struct iwl_mvm
*mvm
= IWL_OP_MODE_GET_MVM(op_mode
);
2498 struct iwl_lq_sta
*lq_sta
= &sta_priv
->lq_sta
;
2500 IWL_DEBUG_RATE(mvm
, "create station rate scale window\n");
2502 lq_sta
->pers
.drv
= mvm
;
2503 #ifdef CONFIG_MAC80211_DEBUGFS
2504 lq_sta
->pers
.dbg_fixed_rate
= 0;
2505 lq_sta
->pers
.dbg_fixed_txp_reduction
= TPC_INVALID
;
2507 lq_sta
->pers
.chains
= 0;
2508 memset(lq_sta
->pers
.chain_signal
, 0, sizeof(lq_sta
->pers
.chain_signal
));
2510 return &sta_priv
->lq_sta
;
2513 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap
*vht_cap
,
2516 u16 rx_mcs
= le16_to_cpu(vht_cap
->vht_mcs
.rx_mcs_map
) &
2517 (0x3 << (2 * (nss
- 1)));
2518 rx_mcs
>>= (2 * (nss
- 1));
2520 if (rx_mcs
== IEEE80211_VHT_MCS_SUPPORT_0_7
)
2521 return IWL_RATE_MCS_7_INDEX
;
2522 else if (rx_mcs
== IEEE80211_VHT_MCS_SUPPORT_0_8
)
2523 return IWL_RATE_MCS_8_INDEX
;
2524 else if (rx_mcs
== IEEE80211_VHT_MCS_SUPPORT_0_9
)
2525 return IWL_RATE_MCS_9_INDEX
;
2527 WARN_ON_ONCE(rx_mcs
!= IEEE80211_VHT_MCS_NOT_SUPPORTED
);
2531 static void rs_vht_set_enabled_rates(struct ieee80211_sta
*sta
,
2532 struct ieee80211_sta_vht_cap
*vht_cap
,
2533 struct iwl_lq_sta
*lq_sta
)
2536 int highest_mcs
= rs_vht_highest_rx_mcs_index(vht_cap
, 1);
2538 if (highest_mcs
>= IWL_RATE_MCS_0_INDEX
) {
2539 for (i
= IWL_RATE_MCS_0_INDEX
; i
<= highest_mcs
; i
++) {
2540 if (i
== IWL_RATE_9M_INDEX
)
2543 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2544 if (i
== IWL_RATE_MCS_9_INDEX
&&
2545 sta
->bandwidth
== IEEE80211_STA_RX_BW_20
)
2548 lq_sta
->active_siso_rate
|= BIT(i
);
2552 if (sta
->rx_nss
< 2)
2555 highest_mcs
= rs_vht_highest_rx_mcs_index(vht_cap
, 2);
2556 if (highest_mcs
>= IWL_RATE_MCS_0_INDEX
) {
2557 for (i
= IWL_RATE_MCS_0_INDEX
; i
<= highest_mcs
; i
++) {
2558 if (i
== IWL_RATE_9M_INDEX
)
2561 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2562 if (i
== IWL_RATE_MCS_9_INDEX
&&
2563 sta
->bandwidth
== IEEE80211_STA_RX_BW_20
)
2566 lq_sta
->active_mimo2_rate
|= BIT(i
);
2571 static void rs_ht_init(struct iwl_mvm
*mvm
,
2572 struct ieee80211_sta
*sta
,
2573 struct iwl_lq_sta
*lq_sta
,
2574 struct ieee80211_sta_ht_cap
*ht_cap
)
2576 /* active_siso_rate mask includes 9 MBits (bit 5),
2577 * and CCK (bits 0-3), supp_rates[] does not;
2578 * shift to convert format, force 9 MBits off.
2580 lq_sta
->active_siso_rate
= ht_cap
->mcs
.rx_mask
[0] << 1;
2581 lq_sta
->active_siso_rate
|= ht_cap
->mcs
.rx_mask
[0] & 0x1;
2582 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2583 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2585 lq_sta
->active_mimo2_rate
= ht_cap
->mcs
.rx_mask
[1] << 1;
2586 lq_sta
->active_mimo2_rate
|= ht_cap
->mcs
.rx_mask
[1] & 0x1;
2587 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2588 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2590 if (mvm
->cfg
->ht_params
->ldpc
&&
2591 (ht_cap
->cap
& IEEE80211_HT_CAP_LDPC_CODING
))
2592 lq_sta
->ldpc
= true;
2594 if (mvm
->cfg
->ht_params
->stbc
&&
2595 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm
)) > 1) &&
2596 (ht_cap
->cap
& IEEE80211_HT_CAP_RX_STBC
))
2597 lq_sta
->stbc_capable
= true;
2599 lq_sta
->is_vht
= false;
2602 static void rs_vht_init(struct iwl_mvm
*mvm
,
2603 struct ieee80211_sta
*sta
,
2604 struct iwl_lq_sta
*lq_sta
,
2605 struct ieee80211_sta_vht_cap
*vht_cap
)
2607 rs_vht_set_enabled_rates(sta
, vht_cap
, lq_sta
);
2609 if (mvm
->cfg
->ht_params
->ldpc
&&
2610 (vht_cap
->cap
& IEEE80211_VHT_CAP_RXLDPC
))
2611 lq_sta
->ldpc
= true;
2613 if (mvm
->cfg
->ht_params
->stbc
&&
2614 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm
)) > 1) &&
2615 (vht_cap
->cap
& IEEE80211_VHT_CAP_RXSTBC_MASK
))
2616 lq_sta
->stbc_capable
= true;
2618 if ((mvm
->fw
->ucode_capa
.capa
[0] & IWL_UCODE_TLV_CAPA_BEAMFORMER
) &&
2619 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm
)) > 1) &&
2620 (vht_cap
->cap
& IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE
))
2621 lq_sta
->bfer_capable
= true;
2623 lq_sta
->is_vht
= true;
2626 #ifdef CONFIG_IWLWIFI_DEBUGFS
2627 static void iwl_mvm_reset_frame_stats(struct iwl_mvm
*mvm
)
2629 spin_lock_bh(&mvm
->drv_stats_lock
);
2630 memset(&mvm
->drv_rx_stats
, 0, sizeof(mvm
->drv_rx_stats
));
2631 spin_unlock_bh(&mvm
->drv_stats_lock
);
2634 void iwl_mvm_update_frame_stats(struct iwl_mvm
*mvm
, u32 rate
, bool agg
)
2636 u8 nss
= 0, mcs
= 0;
2638 spin_lock(&mvm
->drv_stats_lock
);
2641 mvm
->drv_rx_stats
.agg_frames
++;
2643 mvm
->drv_rx_stats
.success_frames
++;
2645 switch (rate
& RATE_MCS_CHAN_WIDTH_MSK
) {
2646 case RATE_MCS_CHAN_WIDTH_20
:
2647 mvm
->drv_rx_stats
.bw_20_frames
++;
2649 case RATE_MCS_CHAN_WIDTH_40
:
2650 mvm
->drv_rx_stats
.bw_40_frames
++;
2652 case RATE_MCS_CHAN_WIDTH_80
:
2653 mvm
->drv_rx_stats
.bw_80_frames
++;
2656 WARN_ONCE(1, "bad BW. rate 0x%x", rate
);
2659 if (rate
& RATE_MCS_HT_MSK
) {
2660 mvm
->drv_rx_stats
.ht_frames
++;
2661 mcs
= rate
& RATE_HT_MCS_RATE_CODE_MSK
;
2662 nss
= ((rate
& RATE_HT_MCS_NSS_MSK
) >> RATE_HT_MCS_NSS_POS
) + 1;
2663 } else if (rate
& RATE_MCS_VHT_MSK
) {
2664 mvm
->drv_rx_stats
.vht_frames
++;
2665 mcs
= rate
& RATE_VHT_MCS_RATE_CODE_MSK
;
2666 nss
= ((rate
& RATE_VHT_MCS_NSS_MSK
) >>
2667 RATE_VHT_MCS_NSS_POS
) + 1;
2669 mvm
->drv_rx_stats
.legacy_frames
++;
2673 mvm
->drv_rx_stats
.siso_frames
++;
2675 mvm
->drv_rx_stats
.mimo2_frames
++;
2677 if (rate
& RATE_MCS_SGI_MSK
)
2678 mvm
->drv_rx_stats
.sgi_frames
++;
2680 mvm
->drv_rx_stats
.ngi_frames
++;
2682 mvm
->drv_rx_stats
.last_rates
[mvm
->drv_rx_stats
.last_frame_idx
] = rate
;
2683 mvm
->drv_rx_stats
.last_frame_idx
=
2684 (mvm
->drv_rx_stats
.last_frame_idx
+ 1) %
2685 ARRAY_SIZE(mvm
->drv_rx_stats
.last_rates
);
2687 spin_unlock(&mvm
->drv_stats_lock
);
2692 * Called after adding a new station to initialize rate scaling
2694 void iwl_mvm_rs_rate_init(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
2695 enum ieee80211_band band
, bool init
)
2698 struct ieee80211_hw
*hw
= mvm
->hw
;
2699 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
2700 struct ieee80211_sta_vht_cap
*vht_cap
= &sta
->vht_cap
;
2701 struct iwl_mvm_sta
*sta_priv
= iwl_mvm_sta_from_mac80211(sta
);
2702 struct iwl_lq_sta
*lq_sta
= &sta_priv
->lq_sta
;
2703 struct ieee80211_supported_band
*sband
;
2704 unsigned long supp
; /* must be unsigned long for for_each_set_bit */
2706 /* clear all non-persistent lq data */
2707 memset(lq_sta
, 0, offsetof(typeof(*lq_sta
), pers
));
2709 sband
= hw
->wiphy
->bands
[band
];
2711 lq_sta
->lq
.sta_id
= sta_priv
->sta_id
;
2713 for (j
= 0; j
< LQ_SIZE
; j
++)
2714 rs_rate_scale_clear_tbl_windows(mvm
, &lq_sta
->lq_info
[j
]);
2716 lq_sta
->flush_timer
= 0;
2717 lq_sta
->last_tx
= jiffies
;
2720 "LQ: *** rate scale station global init for station %d ***\n",
2722 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2723 * the lowest or the highest rate.. Could consider using RSSI from
2724 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2727 lq_sta
->missed_rate_counter
= IWL_MVM_RS_MISSED_RATE_MAX
;
2728 lq_sta
->band
= sband
->band
;
2730 * active legacy rates as per supported rates bitmap
2732 supp
= sta
->supp_rates
[sband
->band
];
2733 lq_sta
->active_legacy_rate
= 0;
2734 for_each_set_bit(i
, &supp
, BITS_PER_LONG
)
2735 lq_sta
->active_legacy_rate
|= BIT(sband
->bitrates
[i
].hw_value
);
2737 /* TODO: should probably account for rx_highest for both HT/VHT */
2738 if (!vht_cap
|| !vht_cap
->vht_supported
)
2739 rs_ht_init(mvm
, sta
, lq_sta
, ht_cap
);
2741 rs_vht_init(mvm
, sta
, lq_sta
, vht_cap
);
2743 if (IWL_MVM_RS_DISABLE_P2P_MIMO
&& sta_priv
->vif
->p2p
)
2744 lq_sta
->active_mimo2_rate
= 0;
2746 lq_sta
->max_legacy_rate_idx
=
2747 rs_get_max_rate_from_mask(lq_sta
->active_legacy_rate
);
2748 lq_sta
->max_siso_rate_idx
=
2749 rs_get_max_rate_from_mask(lq_sta
->active_siso_rate
);
2750 lq_sta
->max_mimo2_rate_idx
=
2751 rs_get_max_rate_from_mask(lq_sta
->active_mimo2_rate
);
2754 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2755 lq_sta
->active_legacy_rate
,
2756 lq_sta
->active_siso_rate
,
2757 lq_sta
->active_mimo2_rate
,
2758 lq_sta
->is_vht
, lq_sta
->ldpc
, lq_sta
->stbc_capable
,
2759 lq_sta
->bfer_capable
);
2760 IWL_DEBUG_RATE(mvm
, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2761 lq_sta
->max_legacy_rate_idx
,
2762 lq_sta
->max_siso_rate_idx
,
2763 lq_sta
->max_mimo2_rate_idx
);
2765 /* These values will be overridden later */
2766 lq_sta
->lq
.single_stream_ant_msk
=
2767 first_antenna(iwl_mvm_get_valid_tx_ant(mvm
));
2768 lq_sta
->lq
.dual_stream_ant_msk
= ANT_AB
;
2770 /* as default allow aggregation for all tids */
2771 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2773 #ifdef CONFIG_IWLWIFI_DEBUGFS
2774 iwl_mvm_reset_frame_stats(mvm
);
2776 rs_initialize_lq(mvm
, sta
, lq_sta
, band
, init
);
2779 static void rs_rate_update(void *mvm_r
,
2780 struct ieee80211_supported_band
*sband
,
2781 struct cfg80211_chan_def
*chandef
,
2782 struct ieee80211_sta
*sta
, void *priv_sta
,
2786 struct iwl_op_mode
*op_mode
=
2787 (struct iwl_op_mode
*)mvm_r
;
2788 struct iwl_mvm
*mvm
= IWL_OP_MODE_GET_MVM(op_mode
);
2790 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2791 for (tid
= 0; tid
< IWL_MAX_TID_COUNT
; tid
++)
2792 ieee80211_stop_tx_ba_session(sta
, tid
);
2794 iwl_mvm_rs_rate_init(mvm
, sta
, sband
->band
, false);
2797 #ifdef CONFIG_MAC80211_DEBUGFS
2798 static void rs_build_rates_table_from_fixed(struct iwl_mvm
*mvm
,
2799 struct iwl_lq_cmd
*lq_cmd
,
2800 enum ieee80211_band band
,
2803 struct rs_rate rate
;
2805 int num_rates
= ARRAY_SIZE(lq_cmd
->rs_table
);
2806 __le32 ucode_rate_le32
= cpu_to_le32(ucode_rate
);
2807 u8 ant
= (ucode_rate
& RATE_MCS_ANT_ABC_MSK
) >> RATE_MCS_ANT_POS
;
2809 for (i
= 0; i
< num_rates
; i
++)
2810 lq_cmd
->rs_table
[i
] = ucode_rate_le32
;
2812 rs_rate_from_ucode_rate(ucode_rate
, band
, &rate
);
2815 lq_cmd
->mimo_delim
= num_rates
- 1;
2817 lq_cmd
->mimo_delim
= 0;
2819 lq_cmd
->reduced_tpc
= 0;
2821 if (num_of_ant(ant
) == 1)
2822 lq_cmd
->single_stream_ant_msk
= ant
;
2824 lq_cmd
->agg_frame_cnt_limit
= LINK_QUAL_AGG_FRAME_LIMIT_DEF
;
2826 #endif /* CONFIG_MAC80211_DEBUGFS */
2828 static void rs_fill_rates_for_column(struct iwl_mvm
*mvm
,
2829 struct iwl_lq_sta
*lq_sta
,
2830 struct rs_rate
*rate
,
2831 __le32
*rs_table
, int *rs_table_index
,
2832 int num_rates
, int num_retries
,
2833 u8 valid_tx_ant
, bool toggle_ant
)
2837 bool bottom_reached
= false;
2838 int prev_rate_idx
= rate
->index
;
2839 int end
= LINK_QUAL_MAX_RETRY_NUM
;
2840 int index
= *rs_table_index
;
2842 for (i
= 0; i
< num_rates
&& index
< end
; i
++) {
2843 for (j
= 0; j
< num_retries
&& index
< end
; j
++, index
++) {
2844 ucode_rate
= cpu_to_le32(ucode_rate_from_rs_rate(mvm
,
2846 rs_table
[index
] = ucode_rate
;
2848 rs_toggle_antenna(valid_tx_ant
, rate
);
2851 prev_rate_idx
= rate
->index
;
2852 bottom_reached
= rs_get_lower_rate_in_column(lq_sta
, rate
);
2853 if (bottom_reached
&& !is_legacy(rate
))
2857 if (!bottom_reached
&& !is_legacy(rate
))
2858 rate
->index
= prev_rate_idx
;
2860 *rs_table_index
= index
;
2863 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2864 * column the rate table should look like this:
2866 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2867 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2868 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2869 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2870 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2871 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2872 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2873 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2874 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2875 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2876 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2877 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2878 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2879 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2880 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2881 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2883 static void rs_build_rates_table(struct iwl_mvm
*mvm
,
2884 struct ieee80211_sta
*sta
,
2885 struct iwl_lq_sta
*lq_sta
,
2886 const struct rs_rate
*initial_rate
)
2888 struct rs_rate rate
;
2889 int num_rates
, num_retries
, index
= 0;
2890 u8 valid_tx_ant
= 0;
2891 struct iwl_lq_cmd
*lq_cmd
= &lq_sta
->lq
;
2892 bool toggle_ant
= false;
2894 memcpy(&rate
, initial_rate
, sizeof(rate
));
2896 valid_tx_ant
= iwl_mvm_get_valid_tx_ant(mvm
);
2898 /* TODO: remove old API when min FW API hits 14 */
2899 if (!(mvm
->fw
->ucode_capa
.api
[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS
) &&
2900 rs_stbc_allow(mvm
, sta
, lq_sta
))
2903 if (is_siso(&rate
)) {
2904 num_rates
= IWL_MVM_RS_INITIAL_SISO_NUM_RATES
;
2905 num_retries
= IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE
;
2906 } else if (is_mimo(&rate
)) {
2907 num_rates
= IWL_MVM_RS_INITIAL_MIMO_NUM_RATES
;
2908 num_retries
= IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE
;
2910 num_rates
= IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES
;
2911 num_retries
= IWL_MVM_RS_INITIAL_LEGACY_RETRIES
;
2915 rs_fill_rates_for_column(mvm
, lq_sta
, &rate
, lq_cmd
->rs_table
, &index
,
2916 num_rates
, num_retries
, valid_tx_ant
,
2919 rs_get_lower_rate_down_column(lq_sta
, &rate
);
2921 if (is_siso(&rate
)) {
2922 num_rates
= IWL_MVM_RS_SECONDARY_SISO_NUM_RATES
;
2923 num_retries
= IWL_MVM_RS_SECONDARY_SISO_RETRIES
;
2924 lq_cmd
->mimo_delim
= index
;
2925 } else if (is_legacy(&rate
)) {
2926 num_rates
= IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES
;
2927 num_retries
= IWL_MVM_RS_SECONDARY_LEGACY_RETRIES
;
2934 rs_fill_rates_for_column(mvm
, lq_sta
, &rate
, lq_cmd
->rs_table
, &index
,
2935 num_rates
, num_retries
, valid_tx_ant
,
2938 rs_get_lower_rate_down_column(lq_sta
, &rate
);
2940 num_rates
= IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES
;
2941 num_retries
= IWL_MVM_RS_SECONDARY_LEGACY_RETRIES
;
2943 rs_fill_rates_for_column(mvm
, lq_sta
, &rate
, lq_cmd
->rs_table
, &index
,
2944 num_rates
, num_retries
, valid_tx_ant
,
2949 struct rs_bfer_active_iter_data
{
2950 struct ieee80211_sta
*exclude_sta
;
2951 struct iwl_mvm_sta
*bfer_mvmsta
;
2954 static void rs_bfer_active_iter(void *_data
,
2955 struct ieee80211_sta
*sta
)
2957 struct rs_bfer_active_iter_data
*data
= _data
;
2958 struct iwl_mvm_sta
*mvmsta
= iwl_mvm_sta_from_mac80211(sta
);
2959 struct iwl_lq_cmd
*lq_cmd
= &mvmsta
->lq_sta
.lq
;
2960 u32 ss_params
= le32_to_cpu(lq_cmd
->ss_params
);
2962 if (sta
== data
->exclude_sta
)
2965 /* The current sta has BFER allowed */
2966 if (ss_params
& LQ_SS_BFER_ALLOWED
) {
2967 WARN_ON_ONCE(data
->bfer_mvmsta
!= NULL
);
2969 data
->bfer_mvmsta
= mvmsta
;
2973 static int rs_bfer_priority(struct iwl_mvm_sta
*sta
)
2976 enum nl80211_iftype viftype
= ieee80211_vif_type_p2p(sta
->vif
);
2979 case NL80211_IFTYPE_AP
:
2980 case NL80211_IFTYPE_P2P_GO
:
2983 case NL80211_IFTYPE_P2P_CLIENT
:
2986 case NL80211_IFTYPE_STATION
:
2990 WARN_ONCE(true, "viftype %d sta_id %d", viftype
, sta
->sta_id
);
2997 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
2998 static int rs_bfer_priority_cmp(struct iwl_mvm_sta
*sta1
,
2999 struct iwl_mvm_sta
*sta2
)
3001 int prio1
= rs_bfer_priority(sta1
);
3002 int prio2
= rs_bfer_priority(sta2
);
3011 static void rs_set_lq_ss_params(struct iwl_mvm
*mvm
,
3012 struct ieee80211_sta
*sta
,
3013 struct iwl_lq_sta
*lq_sta
,
3014 const struct rs_rate
*initial_rate
)
3016 struct iwl_lq_cmd
*lq_cmd
= &lq_sta
->lq
;
3017 struct iwl_mvm_sta
*mvmsta
= iwl_mvm_sta_from_mac80211(sta
);
3018 struct rs_bfer_active_iter_data data
= {
3020 .bfer_mvmsta
= NULL
,
3022 struct iwl_mvm_sta
*bfer_mvmsta
= NULL
;
3023 u32 ss_params
= LQ_SS_PARAMS_VALID
;
3025 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
))
3028 /* Check if forcing the decision is configured.
3029 * Note that SISO is forced by not allowing STBC or BFER
3031 if (lq_sta
->ss_force
== RS_SS_FORCE_STBC
)
3032 ss_params
|= (LQ_SS_STBC_1SS_ALLOWED
| LQ_SS_FORCE
);
3033 else if (lq_sta
->ss_force
== RS_SS_FORCE_BFER
)
3034 ss_params
|= (LQ_SS_BFER_ALLOWED
| LQ_SS_FORCE
);
3036 if (lq_sta
->ss_force
!= RS_SS_FORCE_NONE
) {
3037 IWL_DEBUG_RATE(mvm
, "Forcing single stream Tx decision %d\n",
3042 if (lq_sta
->stbc_capable
)
3043 ss_params
|= LQ_SS_STBC_1SS_ALLOWED
;
3045 if (!lq_sta
->bfer_capable
)
3048 ieee80211_iterate_stations_atomic(mvm
->hw
,
3049 rs_bfer_active_iter
,
3051 bfer_mvmsta
= data
.bfer_mvmsta
;
3053 /* This code is safe as it doesn't run concurrently for different
3054 * stations. This is guaranteed by the fact that calls to
3055 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3058 IWL_DEBUG_RATE(mvm
, "No sta with BFER allowed found. Allow\n");
3060 ss_params
|= LQ_SS_BFER_ALLOWED
;
3064 IWL_DEBUG_RATE(mvm
, "Found existing sta %d with BFER activated\n",
3065 bfer_mvmsta
->sta_id
);
3067 /* Disallow BFER on another STA if active and we're a higher priority */
3068 if (rs_bfer_priority_cmp(mvmsta
, bfer_mvmsta
) > 0) {
3069 struct iwl_lq_cmd
*bfersta_lq_cmd
= &bfer_mvmsta
->lq_sta
.lq
;
3070 u32 bfersta_ss_params
= le32_to_cpu(bfersta_lq_cmd
->ss_params
);
3072 bfersta_ss_params
&= ~LQ_SS_BFER_ALLOWED
;
3073 bfersta_lq_cmd
->ss_params
= cpu_to_le32(bfersta_ss_params
);
3074 iwl_mvm_send_lq_cmd(mvm
, bfersta_lq_cmd
, false);
3076 ss_params
|= LQ_SS_BFER_ALLOWED
;
3078 "Lower priority BFER sta found (%d). Switch BFER\n",
3079 bfer_mvmsta
->sta_id
);
3082 lq_cmd
->ss_params
= cpu_to_le32(ss_params
);
3085 static void rs_fill_lq_cmd(struct iwl_mvm
*mvm
,
3086 struct ieee80211_sta
*sta
,
3087 struct iwl_lq_sta
*lq_sta
,
3088 const struct rs_rate
*initial_rate
)
3090 struct iwl_lq_cmd
*lq_cmd
= &lq_sta
->lq
;
3091 struct iwl_mvm_sta
*mvmsta
;
3092 struct iwl_mvm_vif
*mvmvif
;
3094 lq_cmd
->agg_disable_start_th
= IWL_MVM_RS_AGG_DISABLE_START
;
3095 lq_cmd
->agg_time_limit
=
3096 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT
);
3098 #ifdef CONFIG_MAC80211_DEBUGFS
3099 if (lq_sta
->pers
.dbg_fixed_rate
) {
3100 rs_build_rates_table_from_fixed(mvm
, lq_cmd
,
3102 lq_sta
->pers
.dbg_fixed_rate
);
3106 if (WARN_ON_ONCE(!sta
|| !initial_rate
))
3109 rs_build_rates_table(mvm
, sta
, lq_sta
, initial_rate
);
3111 if (mvm
->fw
->ucode_capa
.api
[0] & IWL_UCODE_TLV_API_LQ_SS_PARAMS
)
3112 rs_set_lq_ss_params(mvm
, sta
, lq_sta
, initial_rate
);
3114 if (num_of_ant(initial_rate
->ant
) == 1)
3115 lq_cmd
->single_stream_ant_msk
= initial_rate
->ant
;
3117 mvmsta
= iwl_mvm_sta_from_mac80211(sta
);
3118 mvmvif
= iwl_mvm_vif_from_mac80211(mvmsta
->vif
);
3120 if (num_of_ant(initial_rate
->ant
) == 1)
3121 lq_cmd
->single_stream_ant_msk
= initial_rate
->ant
;
3123 lq_cmd
->agg_frame_cnt_limit
= mvmsta
->max_agg_bufsize
;
3126 * In case of low latency, tell the firwmare to leave a frame in the
3127 * Tx Fifo so that it can start a transaction in the same TxOP. This
3128 * basically allows the firmware to send bursts.
3130 if (iwl_mvm_vif_low_latency(mvmvif
)) {
3131 lq_cmd
->agg_frame_cnt_limit
--;
3133 if (mvm
->low_latency_agg_frame_limit
)
3134 lq_cmd
->agg_frame_cnt_limit
=
3135 min(lq_cmd
->agg_frame_cnt_limit
,
3136 mvm
->low_latency_agg_frame_limit
);
3139 if (mvmsta
->vif
->p2p
)
3140 lq_cmd
->flags
|= LQ_FLAG_USE_RTS_MSK
;
3142 lq_cmd
->agg_time_limit
=
3143 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm
, sta
));
3146 static void *rs_alloc(struct ieee80211_hw
*hw
, struct dentry
*debugfsdir
)
3150 /* rate scale requires free function to be implemented */
3151 static void rs_free(void *mvm_rate
)
3156 static void rs_free_sta(void *mvm_r
, struct ieee80211_sta
*sta
,
3159 struct iwl_op_mode
*op_mode __maybe_unused
= mvm_r
;
3160 struct iwl_mvm
*mvm __maybe_unused
= IWL_OP_MODE_GET_MVM(op_mode
);
3162 IWL_DEBUG_RATE(mvm
, "enter\n");
3163 IWL_DEBUG_RATE(mvm
, "leave\n");
3166 #ifdef CONFIG_MAC80211_DEBUGFS
3167 int rs_pretty_print_rate(char *buf
, const u32 rate
)
3171 u8 mcs
= 0, nss
= 0;
3172 u8 ant
= (rate
& RATE_MCS_ANT_ABC_MSK
) >> RATE_MCS_ANT_POS
;
3174 if (!(rate
& RATE_MCS_HT_MSK
) &&
3175 !(rate
& RATE_MCS_VHT_MSK
)) {
3176 int index
= iwl_hwrate_to_plcp_idx(rate
);
3178 return sprintf(buf
, "Legacy | ANT: %s Rate: %s Mbps\n",
3180 index
== IWL_RATE_INVALID
? "BAD" :
3181 iwl_rate_mcs
[index
].mbps
);
3184 if (rate
& RATE_MCS_VHT_MSK
) {
3186 mcs
= rate
& RATE_VHT_MCS_RATE_CODE_MSK
;
3187 nss
= ((rate
& RATE_VHT_MCS_NSS_MSK
)
3188 >> RATE_VHT_MCS_NSS_POS
) + 1;
3189 } else if (rate
& RATE_MCS_HT_MSK
) {
3191 mcs
= rate
& RATE_HT_MCS_INDEX_MSK
;
3193 type
= "Unknown"; /* shouldn't happen */
3196 switch (rate
& RATE_MCS_CHAN_WIDTH_MSK
) {
3197 case RATE_MCS_CHAN_WIDTH_20
:
3200 case RATE_MCS_CHAN_WIDTH_40
:
3203 case RATE_MCS_CHAN_WIDTH_80
:
3206 case RATE_MCS_CHAN_WIDTH_160
:
3213 return sprintf(buf
, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3214 type
, rs_pretty_ant(ant
), bw
, mcs
, nss
,
3215 (rate
& RATE_MCS_SGI_MSK
) ? "SGI " : "NGI ",
3216 (rate
& RATE_MCS_HT_STBC_MSK
) ? "STBC " : "",
3217 (rate
& RATE_MCS_LDPC_MSK
) ? "LDPC " : "",
3218 (rate
& RATE_MCS_BF_MSK
) ? "BF " : "",
3219 (rate
& RATE_MCS_ZLF_MSK
) ? "ZLF " : "");
3223 * Program the device to use fixed rate for frame transmit
3224 * This is for debugging/testing only
3225 * once the device start use fixed rate, we need to reload the module
3226 * to being back the normal operation.
3228 static void rs_program_fix_rate(struct iwl_mvm
*mvm
,
3229 struct iwl_lq_sta
*lq_sta
)
3231 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
3232 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3233 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3235 IWL_DEBUG_RATE(mvm
, "sta_id %d rate 0x%X\n",
3236 lq_sta
->lq
.sta_id
, lq_sta
->pers
.dbg_fixed_rate
);
3238 if (lq_sta
->pers
.dbg_fixed_rate
) {
3239 rs_fill_lq_cmd(mvm
, NULL
, lq_sta
, NULL
);
3240 iwl_mvm_send_lq_cmd(lq_sta
->pers
.drv
, &lq_sta
->lq
, false);
3244 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
3245 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3247 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3248 struct iwl_mvm
*mvm
;
3253 mvm
= lq_sta
->pers
.drv
;
3254 memset(buf
, 0, sizeof(buf
));
3255 buf_size
= min(count
, sizeof(buf
) - 1);
3256 if (copy_from_user(buf
, user_buf
, buf_size
))
3259 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
3260 lq_sta
->pers
.dbg_fixed_rate
= parsed_rate
;
3262 lq_sta
->pers
.dbg_fixed_rate
= 0;
3264 rs_program_fix_rate(mvm
, lq_sta
);
3269 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
3270 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3277 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3278 struct iwl_mvm
*mvm
;
3279 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
3280 struct rs_rate
*rate
= &tbl
->rate
;
3281 mvm
= lq_sta
->pers
.drv
;
3282 buff
= kmalloc(2048, GFP_KERNEL
);
3286 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
3287 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%lX\n",
3288 lq_sta
->total_failed
, lq_sta
->total_success
,
3289 lq_sta
->active_legacy_rate
);
3290 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
3291 lq_sta
->pers
.dbg_fixed_rate
);
3292 desc
+= sprintf(buff
+desc
, "valid_tx_ant %s%s%s\n",
3293 (iwl_mvm_get_valid_tx_ant(mvm
) & ANT_A
) ? "ANT_A," : "",
3294 (iwl_mvm_get_valid_tx_ant(mvm
) & ANT_B
) ? "ANT_B," : "",
3295 (iwl_mvm_get_valid_tx_ant(mvm
) & ANT_C
) ? "ANT_C" : "");
3296 desc
+= sprintf(buff
+desc
, "lq type %s\n",
3297 (is_legacy(rate
)) ? "legacy" :
3298 is_vht(rate
) ? "VHT" : "HT");
3299 if (!is_legacy(rate
)) {
3300 desc
+= sprintf(buff
+desc
, " %s",
3301 (is_siso(rate
)) ? "SISO" : "MIMO2");
3302 desc
+= sprintf(buff
+desc
, " %s",
3303 (is_ht20(rate
)) ? "20MHz" :
3304 (is_ht40(rate
)) ? "40MHz" :
3305 (is_ht80(rate
)) ? "80Mhz" : "BAD BW");
3306 desc
+= sprintf(buff
+desc
, " %s %s %s\n",
3307 (rate
->sgi
) ? "SGI" : "NGI",
3308 (rate
->ldpc
) ? "LDPC" : "BCC",
3309 (lq_sta
->is_agg
) ? "AGG on" : "");
3311 desc
+= sprintf(buff
+desc
, "last tx rate=0x%X\n",
3312 lq_sta
->last_rate_n_flags
);
3313 desc
+= sprintf(buff
+desc
,
3314 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3316 lq_sta
->lq
.mimo_delim
,
3317 lq_sta
->lq
.single_stream_ant_msk
,
3318 lq_sta
->lq
.dual_stream_ant_msk
);
3320 desc
+= sprintf(buff
+desc
,
3321 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3322 le16_to_cpu(lq_sta
->lq
.agg_time_limit
),
3323 lq_sta
->lq
.agg_disable_start_th
,
3324 lq_sta
->lq
.agg_frame_cnt_limit
);
3326 desc
+= sprintf(buff
+desc
, "reduced tpc=%d\n", lq_sta
->lq
.reduced_tpc
);
3327 desc
+= sprintf(buff
+desc
,
3328 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3329 lq_sta
->lq
.initial_rate_index
[0],
3330 lq_sta
->lq
.initial_rate_index
[1],
3331 lq_sta
->lq
.initial_rate_index
[2],
3332 lq_sta
->lq
.initial_rate_index
[3]);
3334 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++) {
3335 u32 r
= le32_to_cpu(lq_sta
->lq
.rs_table
[i
]);
3337 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X ", i
, r
);
3338 desc
+= rs_pretty_print_rate(buff
+desc
, r
);
3341 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3346 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
3347 .write
= rs_sta_dbgfs_scale_table_write
,
3348 .read
= rs_sta_dbgfs_scale_table_read
,
3349 .open
= simple_open
,
3350 .llseek
= default_llseek
,
3352 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
3353 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3359 struct iwl_scale_tbl_info
*tbl
;
3360 struct rs_rate
*rate
;
3361 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3363 buff
= kmalloc(1024, GFP_KERNEL
);
3367 for (i
= 0; i
< LQ_SIZE
; i
++) {
3368 tbl
= &(lq_sta
->lq_info
[i
]);
3370 desc
+= sprintf(buff
+desc
,
3371 "%s type=%d SGI=%d BW=%s DUP=0\n"
3373 lq_sta
->active_tbl
== i
? "*" : "x",
3376 is_ht20(rate
) ? "20Mhz" :
3377 is_ht40(rate
) ? "40Mhz" :
3378 is_ht80(rate
) ? "80Mhz" : "ERR",
3380 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
3381 desc
+= sprintf(buff
+desc
,
3382 "counter=%d success=%d %%=%d\n",
3383 tbl
->win
[j
].counter
,
3384 tbl
->win
[j
].success_counter
,
3385 tbl
->win
[j
].success_ratio
);
3388 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3393 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
3394 .read
= rs_sta_dbgfs_stats_table_read
,
3395 .open
= simple_open
,
3396 .llseek
= default_llseek
,
3399 static ssize_t
rs_sta_dbgfs_drv_tx_stats_read(struct file
*file
,
3400 char __user
*user_buf
,
3401 size_t count
, loff_t
*ppos
)
3403 static const char * const column_name
[] = {
3404 [RS_COLUMN_LEGACY_ANT_A
] = "LEGACY_ANT_A",
3405 [RS_COLUMN_LEGACY_ANT_B
] = "LEGACY_ANT_B",
3406 [RS_COLUMN_SISO_ANT_A
] = "SISO_ANT_A",
3407 [RS_COLUMN_SISO_ANT_B
] = "SISO_ANT_B",
3408 [RS_COLUMN_SISO_ANT_A_SGI
] = "SISO_ANT_A_SGI",
3409 [RS_COLUMN_SISO_ANT_B_SGI
] = "SISO_ANT_B_SGI",
3410 [RS_COLUMN_MIMO2
] = "MIMO2",
3411 [RS_COLUMN_MIMO2_SGI
] = "MIMO2_SGI",
3414 static const char * const rate_name
[] = {
3415 [IWL_RATE_1M_INDEX
] = "1M",
3416 [IWL_RATE_2M_INDEX
] = "2M",
3417 [IWL_RATE_5M_INDEX
] = "5.5M",
3418 [IWL_RATE_11M_INDEX
] = "11M",
3419 [IWL_RATE_6M_INDEX
] = "6M|MCS0",
3420 [IWL_RATE_9M_INDEX
] = "9M",
3421 [IWL_RATE_12M_INDEX
] = "12M|MCS1",
3422 [IWL_RATE_18M_INDEX
] = "18M|MCS2",
3423 [IWL_RATE_24M_INDEX
] = "24M|MCS3",
3424 [IWL_RATE_36M_INDEX
] = "36M|MCS4",
3425 [IWL_RATE_48M_INDEX
] = "48M|MCS5",
3426 [IWL_RATE_54M_INDEX
] = "54M|MCS6",
3427 [IWL_RATE_MCS_7_INDEX
] = "MCS7",
3428 [IWL_RATE_MCS_8_INDEX
] = "MCS8",
3429 [IWL_RATE_MCS_9_INDEX
] = "MCS9",
3432 char *buff
, *pos
, *endpos
;
3435 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3436 struct rs_rate_stats
*stats
;
3437 static const size_t bufsz
= 1024;
3439 buff
= kmalloc(bufsz
, GFP_KERNEL
);
3444 endpos
= pos
+ bufsz
;
3446 pos
+= scnprintf(pos
, endpos
- pos
, "COLUMN,");
3447 for (rate
= 0; rate
< IWL_RATE_COUNT
; rate
++)
3448 pos
+= scnprintf(pos
, endpos
- pos
, "%s,", rate_name
[rate
]);
3449 pos
+= scnprintf(pos
, endpos
- pos
, "\n");
3451 for (col
= 0; col
< RS_COLUMN_COUNT
; col
++) {
3452 pos
+= scnprintf(pos
, endpos
- pos
,
3453 "%s,", column_name
[col
]);
3455 for (rate
= 0; rate
< IWL_RATE_COUNT
; rate
++) {
3456 stats
= &(lq_sta
->pers
.tx_stats
[col
][rate
]);
3457 pos
+= scnprintf(pos
, endpos
- pos
,
3462 pos
+= scnprintf(pos
, endpos
- pos
, "\n");
3465 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, pos
- buff
);
3470 static ssize_t
rs_sta_dbgfs_drv_tx_stats_write(struct file
*file
,
3471 const char __user
*user_buf
,
3472 size_t count
, loff_t
*ppos
)
3474 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3475 memset(lq_sta
->pers
.tx_stats
, 0, sizeof(lq_sta
->pers
.tx_stats
));
3480 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops
= {
3481 .read
= rs_sta_dbgfs_drv_tx_stats_read
,
3482 .write
= rs_sta_dbgfs_drv_tx_stats_write
,
3483 .open
= simple_open
,
3484 .llseek
= default_llseek
,
3487 static ssize_t
iwl_dbgfs_ss_force_read(struct file
*file
,
3488 char __user
*user_buf
,
3489 size_t count
, loff_t
*ppos
)
3491 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3493 int bufsz
= sizeof(buf
);
3495 static const char * const ss_force_name
[] = {
3496 [RS_SS_FORCE_NONE
] = "none",
3497 [RS_SS_FORCE_STBC
] = "stbc",
3498 [RS_SS_FORCE_BFER
] = "bfer",
3499 [RS_SS_FORCE_SISO
] = "siso",
3502 pos
+= scnprintf(buf
+pos
, bufsz
-pos
, "%s\n",
3503 ss_force_name
[lq_sta
->ss_force
]);
3504 return simple_read_from_buffer(user_buf
, count
, ppos
, buf
, pos
);
3507 static ssize_t
iwl_dbgfs_ss_force_write(struct iwl_lq_sta
*lq_sta
, char *buf
,
3508 size_t count
, loff_t
*ppos
)
3510 struct iwl_mvm
*mvm
= lq_sta
->pers
.drv
;
3513 if (!strncmp("none", buf
, 4)) {
3514 lq_sta
->ss_force
= RS_SS_FORCE_NONE
;
3515 } else if (!strncmp("siso", buf
, 4)) {
3516 lq_sta
->ss_force
= RS_SS_FORCE_SISO
;
3517 } else if (!strncmp("stbc", buf
, 4)) {
3518 if (lq_sta
->stbc_capable
) {
3519 lq_sta
->ss_force
= RS_SS_FORCE_STBC
;
3522 "can't force STBC. peer doesn't support\n");
3525 } else if (!strncmp("bfer", buf
, 4)) {
3526 if (lq_sta
->bfer_capable
) {
3527 lq_sta
->ss_force
= RS_SS_FORCE_BFER
;
3530 "can't force BFER. peer doesn't support\n");
3534 IWL_ERR(mvm
, "valid values none|siso|stbc|bfer\n");
3537 return ret
?: count
;
3540 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3541 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3542 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3543 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3544 &iwl_dbgfs_##name##_ops)) \
3548 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force
, 32);
3550 static void rs_add_debugfs(void *mvm
, void *mvm_sta
, struct dentry
*dir
)
3552 struct iwl_lq_sta
*lq_sta
= mvm_sta
;
3554 debugfs_create_file("rate_scale_table", S_IRUSR
| S_IWUSR
, dir
,
3555 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
3556 debugfs_create_file("rate_stats_table", S_IRUSR
, dir
,
3557 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
3558 debugfs_create_file("drv_tx_stats", S_IRUSR
| S_IWUSR
, dir
,
3559 lq_sta
, &rs_sta_dbgfs_drv_tx_stats_ops
);
3560 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR
| S_IWUSR
, dir
,
3561 &lq_sta
->tx_agg_tid_en
);
3562 debugfs_create_u8("reduced_tpc", S_IRUSR
| S_IWUSR
, dir
,
3563 &lq_sta
->pers
.dbg_fixed_txp_reduction
);
3565 MVM_DEBUGFS_ADD_FILE_RS(ss_force
, dir
, S_IRUSR
| S_IWUSR
);
3568 IWL_ERR((struct iwl_mvm
*)mvm
, "Can't create debugfs entity\n");
3571 static void rs_remove_debugfs(void *mvm
, void *mvm_sta
)
3577 * Initialization of rate scaling information is done by driver after
3578 * the station is added. Since mac80211 calls this function before a
3579 * station is added we ignore it.
3581 static void rs_rate_init_stub(void *mvm_r
,
3582 struct ieee80211_supported_band
*sband
,
3583 struct cfg80211_chan_def
*chandef
,
3584 struct ieee80211_sta
*sta
, void *mvm_sta
)
3588 static const struct rate_control_ops rs_mvm_ops
= {
3590 .tx_status
= rs_mac80211_tx_status
,
3591 .get_rate
= rs_get_rate
,
3592 .rate_init
= rs_rate_init_stub
,
3595 .alloc_sta
= rs_alloc_sta
,
3596 .free_sta
= rs_free_sta
,
3597 .rate_update
= rs_rate_update
,
3598 #ifdef CONFIG_MAC80211_DEBUGFS
3599 .add_sta_debugfs
= rs_add_debugfs
,
3600 .remove_sta_debugfs
= rs_remove_debugfs
,
3604 int iwl_mvm_rate_control_register(void)
3606 return ieee80211_rate_control_register(&rs_mvm_ops
);
3609 void iwl_mvm_rate_control_unregister(void)
3611 ieee80211_rate_control_unregister(&rs_mvm_ops
);
3615 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3616 * Tx protection, according to this rquest and previous requests,
3617 * and send the LQ command.
3618 * @mvmsta: The station
3619 * @enable: Enable Tx protection?
3621 int iwl_mvm_tx_protection(struct iwl_mvm
*mvm
, struct iwl_mvm_sta
*mvmsta
,
3624 struct iwl_lq_cmd
*lq
= &mvmsta
->lq_sta
.lq
;
3626 lockdep_assert_held(&mvm
->mutex
);
3629 if (mvmsta
->tx_protection
== 0)
3630 lq
->flags
|= LQ_FLAG_USE_RTS_MSK
;
3631 mvmsta
->tx_protection
++;
3633 mvmsta
->tx_protection
--;
3634 if (mvmsta
->tx_protection
== 0)
3635 lq
->flags
&= ~LQ_FLAG_USE_RTS_MSK
;
3638 return iwl_mvm_send_lq_cmd(mvm
, lq
, false);