1 /******************************************************************************
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/skbuff.h>
28 #include <linux/slab.h>
29 #include <net/mac80211.h>
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/delay.h>
35 #include <linux/workqueue.h>
39 #include "iwl-op-mode.h"
42 #define RS_NAME "iwl-mvm-rs"
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define RS_LEGACY_RETRIES_PER_RATE 1
46 #define RS_HT_VHT_RETRIES_PER_RATE 2
47 #define RS_HT_VHT_RETRIES_PER_RATE_TW 1
48 #define RS_INITIAL_MIMO_NUM_RATES 3
49 #define RS_INITIAL_SISO_NUM_RATES 3
50 #define RS_INITIAL_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM
51 #define RS_SECONDARY_LEGACY_NUM_RATES LINK_QUAL_MAX_RETRY_NUM
52 #define RS_SECONDARY_SISO_NUM_RATES 3
53 #define RS_SECONDARY_SISO_RETRIES 1
55 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
56 #define IWL_RATE_MIN_FAILURE_TH 3 /* min failures to calc tpt */
57 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
59 /* max allowed rate miss before sync LQ cmd */
60 #define IWL_MISSED_RATE_MAX 15
61 #define RS_STAY_IN_COLUMN_TIMEOUT (5*HZ)
62 #define RS_IDLE_TIMEOUT (5*HZ)
64 static u8 rs_ht_to_legacy
[] = {
65 [IWL_RATE_MCS_0_INDEX
] = IWL_RATE_6M_INDEX
,
66 [IWL_RATE_MCS_1_INDEX
] = IWL_RATE_9M_INDEX
,
67 [IWL_RATE_MCS_2_INDEX
] = IWL_RATE_12M_INDEX
,
68 [IWL_RATE_MCS_3_INDEX
] = IWL_RATE_18M_INDEX
,
69 [IWL_RATE_MCS_4_INDEX
] = IWL_RATE_24M_INDEX
,
70 [IWL_RATE_MCS_5_INDEX
] = IWL_RATE_36M_INDEX
,
71 [IWL_RATE_MCS_6_INDEX
] = IWL_RATE_48M_INDEX
,
72 [IWL_RATE_MCS_7_INDEX
] = IWL_RATE_54M_INDEX
,
73 [IWL_RATE_MCS_8_INDEX
] = IWL_RATE_54M_INDEX
,
74 [IWL_RATE_MCS_9_INDEX
] = IWL_RATE_54M_INDEX
,
77 static const u8 ant_toggle_lookup
[] = {
78 [ANT_NONE
] = ANT_NONE
,
88 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
89 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
90 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
91 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
92 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
93 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
94 IWL_RATE_##rp##M_INDEX, \
95 IWL_RATE_##rn##M_INDEX }
97 #define IWL_DECLARE_MCS_RATE(s) \
98 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
99 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
100 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
101 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
102 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
103 IWL_RATE_INVM_INDEX, \
104 IWL_RATE_INVM_INDEX }
108 * rate, ht rate, prev rate, next rate
110 * If there isn't a valid next or previous rate then INV is used which
111 * maps to IWL_RATE_INVALID
114 static const struct iwl_rs_rate_info iwl_rates
[IWL_RATE_COUNT
] = {
115 IWL_DECLARE_RATE_INFO(1, INV
, INV
, 2), /* 1mbps */
116 IWL_DECLARE_RATE_INFO(2, INV
, 1, 5), /* 2mbps */
117 IWL_DECLARE_RATE_INFO(5, INV
, 2, 11), /*5.5mbps */
118 IWL_DECLARE_RATE_INFO(11, INV
, 9, 12), /* 11mbps */
119 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
120 IWL_DECLARE_RATE_INFO(9, INV
, 6, 11), /* 9mbps */
121 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
122 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
123 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
124 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
125 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
126 IWL_DECLARE_RATE_INFO(54, 6, 48, INV
), /* 54mbps ; MCS 6 */
127 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
128 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
129 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
134 RS_ACTION_DOWNSCALE
= -1,
135 RS_ACTION_UPSCALE
= 1,
138 enum rs_column_mode
{
145 #define MAX_NEXT_COLUMNS 7
146 #define MAX_COLUMN_CHECKS 3
148 typedef bool (*allow_column_func_t
) (struct iwl_mvm
*mvm
,
149 struct ieee80211_sta
*sta
,
150 struct iwl_scale_tbl_info
*tbl
);
152 struct rs_tx_column
{
153 enum rs_column_mode mode
;
156 enum rs_column next_columns
[MAX_NEXT_COLUMNS
];
157 allow_column_func_t checks
[MAX_COLUMN_CHECKS
];
160 static bool rs_mimo_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
161 struct iwl_scale_tbl_info
*tbl
)
163 if (!sta
->ht_cap
.ht_supported
)
166 if (sta
->smps_mode
== IEEE80211_SMPS_STATIC
)
169 if (num_of_ant(mvm
->fw
->valid_tx_ant
) < 2)
172 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
))
178 static bool rs_siso_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
179 struct iwl_scale_tbl_info
*tbl
)
181 if (!sta
->ht_cap
.ht_supported
)
187 static bool rs_sgi_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
188 struct iwl_scale_tbl_info
*tbl
)
190 struct rs_rate
*rate
= &tbl
->rate
;
191 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
192 struct ieee80211_sta_vht_cap
*vht_cap
= &sta
->vht_cap
;
194 if (is_ht20(rate
) && (ht_cap
->cap
&
195 IEEE80211_HT_CAP_SGI_20
))
197 if (is_ht40(rate
) && (ht_cap
->cap
&
198 IEEE80211_HT_CAP_SGI_40
))
200 if (is_ht80(rate
) && (vht_cap
->cap
&
201 IEEE80211_VHT_CAP_SHORT_GI_80
))
207 static const struct rs_tx_column rs_tx_columns
[] = {
208 [RS_COLUMN_LEGACY_ANT_A
] = {
212 RS_COLUMN_LEGACY_ANT_B
,
213 RS_COLUMN_SISO_ANT_A
,
214 RS_COLUMN_SISO_ANT_B
,
221 [RS_COLUMN_LEGACY_ANT_B
] = {
225 RS_COLUMN_LEGACY_ANT_A
,
226 RS_COLUMN_SISO_ANT_A
,
227 RS_COLUMN_SISO_ANT_B
,
234 [RS_COLUMN_SISO_ANT_A
] = {
238 RS_COLUMN_SISO_ANT_B
,
240 RS_COLUMN_SISO_ANT_A_SGI
,
241 RS_COLUMN_SISO_ANT_B_SGI
,
242 RS_COLUMN_LEGACY_ANT_A
,
243 RS_COLUMN_LEGACY_ANT_B
,
250 [RS_COLUMN_SISO_ANT_B
] = {
254 RS_COLUMN_SISO_ANT_A
,
256 RS_COLUMN_SISO_ANT_B_SGI
,
257 RS_COLUMN_SISO_ANT_A_SGI
,
258 RS_COLUMN_LEGACY_ANT_A
,
259 RS_COLUMN_LEGACY_ANT_B
,
266 [RS_COLUMN_SISO_ANT_A_SGI
] = {
271 RS_COLUMN_SISO_ANT_B_SGI
,
273 RS_COLUMN_SISO_ANT_A
,
274 RS_COLUMN_SISO_ANT_B
,
276 RS_COLUMN_LEGACY_ANT_A
,
277 RS_COLUMN_LEGACY_ANT_B
,
284 [RS_COLUMN_SISO_ANT_B_SGI
] = {
289 RS_COLUMN_SISO_ANT_A_SGI
,
291 RS_COLUMN_SISO_ANT_B
,
292 RS_COLUMN_SISO_ANT_A
,
294 RS_COLUMN_LEGACY_ANT_A
,
295 RS_COLUMN_LEGACY_ANT_B
,
302 [RS_COLUMN_MIMO2
] = {
306 RS_COLUMN_SISO_ANT_A
,
307 RS_COLUMN_SISO_ANT_B
,
308 RS_COLUMN_SISO_ANT_A_SGI
,
309 RS_COLUMN_SISO_ANT_B_SGI
,
311 RS_COLUMN_LEGACY_ANT_A
,
312 RS_COLUMN_LEGACY_ANT_B
,
318 [RS_COLUMN_MIMO2_SGI
] = {
323 RS_COLUMN_SISO_ANT_A_SGI
,
324 RS_COLUMN_SISO_ANT_B_SGI
,
325 RS_COLUMN_SISO_ANT_A
,
326 RS_COLUMN_SISO_ANT_B
,
328 RS_COLUMN_LEGACY_ANT_A
,
329 RS_COLUMN_LEGACY_ANT_B
,
338 static inline u8
rs_extract_rate(u32 rate_n_flags
)
340 /* also works for HT because bits 7:6 are zero there */
341 return (u8
)(rate_n_flags
& RATE_LEGACY_RATE_MSK
);
344 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags
)
348 if (rate_n_flags
& RATE_MCS_HT_MSK
) {
349 idx
= rate_n_flags
& RATE_HT_MCS_RATE_CODE_MSK
;
350 idx
+= IWL_RATE_MCS_0_INDEX
;
352 /* skip 9M not supported in HT*/
353 if (idx
>= IWL_RATE_9M_INDEX
)
355 if ((idx
>= IWL_FIRST_HT_RATE
) && (idx
<= IWL_LAST_HT_RATE
))
357 } else if (rate_n_flags
& RATE_MCS_VHT_MSK
) {
358 idx
= rate_n_flags
& RATE_VHT_MCS_RATE_CODE_MSK
;
359 idx
+= IWL_RATE_MCS_0_INDEX
;
361 /* skip 9M not supported in VHT*/
362 if (idx
>= IWL_RATE_9M_INDEX
)
364 if ((idx
>= IWL_FIRST_VHT_RATE
) && (idx
<= IWL_LAST_VHT_RATE
))
367 /* legacy rate format, search for match in table */
369 u8 legacy_rate
= rs_extract_rate(rate_n_flags
);
370 for (idx
= 0; idx
< ARRAY_SIZE(iwl_rates
); idx
++)
371 if (iwl_rates
[idx
].plcp
== legacy_rate
)
375 return IWL_RATE_INVALID
;
378 static void rs_rate_scale_perform(struct iwl_mvm
*mvm
,
380 struct ieee80211_sta
*sta
,
381 struct iwl_lq_sta
*lq_sta
);
382 static void rs_fill_lq_cmd(struct iwl_mvm
*mvm
,
383 struct ieee80211_sta
*sta
,
384 struct iwl_lq_sta
*lq_sta
,
385 const struct rs_rate
*initial_rate
);
386 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
, bool force_search
);
389 * The following tables contain the expected throughput metrics for all rates
391 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
393 * where invalid entries are zeros.
395 * CCK rates are only valid in legacy table and will only be used in G
399 static const u16 expected_tpt_legacy
[IWL_RATE_COUNT
] = {
400 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
403 /* Expected TpT tables. 4 indexes:
404 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
406 static const u16 expected_tpt_siso_20MHz
[4][IWL_RATE_COUNT
] = {
407 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
408 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
409 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
410 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
413 static const u16 expected_tpt_siso_40MHz
[4][IWL_RATE_COUNT
] = {
414 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
415 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
416 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
417 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
420 static const u16 expected_tpt_siso_80MHz
[4][IWL_RATE_COUNT
] = {
421 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
422 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
423 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
424 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
427 static const u16 expected_tpt_mimo2_20MHz
[4][IWL_RATE_COUNT
] = {
428 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
429 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
430 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
431 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
434 static const u16 expected_tpt_mimo2_40MHz
[4][IWL_RATE_COUNT
] = {
435 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
436 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
437 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
438 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
441 static const u16 expected_tpt_mimo2_80MHz
[4][IWL_RATE_COUNT
] = {
442 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
443 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
444 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
445 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
449 static const struct iwl_rate_mcs_info iwl_rate_mcs
[IWL_RATE_COUNT
] = {
458 { "24", "16QAM 1/2"},
459 { "36", "16QAM 3/4"},
460 { "48", "64QAM 2/3"},
461 { "54", "64QAM 3/4"},
462 { "60", "64QAM 5/6"},
465 #define MCS_INDEX_PER_STREAM (8)
467 static const char *rs_pretty_ant(u8 ant
)
469 static const char * const ant_name
[] = {
483 return ant_name
[ant
];
486 static const char *rs_pretty_lq_type(enum iwl_table_type type
)
488 static const char * const lq_types
[] = {
490 [LQ_LEGACY_A
] = "LEGACY_A",
491 [LQ_LEGACY_G
] = "LEGACY_G",
492 [LQ_HT_SISO
] = "HT SISO",
493 [LQ_HT_MIMO2
] = "HT MIMO",
494 [LQ_VHT_SISO
] = "VHT SISO",
495 [LQ_VHT_MIMO2
] = "VHT MIMO",
498 if (type
< LQ_NONE
|| type
>= LQ_MAX
)
501 return lq_types
[type
];
504 static inline void rs_dump_rate(struct iwl_mvm
*mvm
, const struct rs_rate
*rate
,
507 IWL_DEBUG_RATE(mvm
, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
508 prefix
, rs_pretty_lq_type(rate
->type
),
509 rate
->index
, rs_pretty_ant(rate
->ant
),
510 rate
->bw
, rate
->sgi
);
513 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data
*window
)
516 window
->success_counter
= 0;
517 window
->success_ratio
= IWL_INVALID_VALUE
;
519 window
->average_tpt
= IWL_INVALID_VALUE
;
522 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm
*mvm
,
523 struct iwl_scale_tbl_info
*tbl
)
527 IWL_DEBUG_RATE(mvm
, "Clearing up window stats\n");
528 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
529 rs_rate_scale_clear_window(&tbl
->win
[i
]);
531 for (i
= 0; i
< ARRAY_SIZE(tbl
->tpc_win
); i
++)
532 rs_rate_scale_clear_window(&tbl
->tpc_win
[i
]);
535 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
537 return (ant_type
& valid_antenna
) == ant_type
;
540 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm
*mvm
,
541 struct iwl_lq_sta
*lq_data
, u8 tid
,
542 struct ieee80211_sta
*sta
)
546 IWL_DEBUG_HT(mvm
, "Starting Tx agg: STA: %pM tid: %d\n",
548 ret
= ieee80211_start_tx_ba_session(sta
, tid
, 5000);
549 if (ret
== -EAGAIN
) {
551 * driver and mac80211 is out of sync
552 * this might be cause by reloading firmware
553 * stop the tx ba session here
555 IWL_ERR(mvm
, "Fail start Tx agg on tid: %d\n",
557 ieee80211_stop_tx_ba_session(sta
, tid
);
562 static void rs_tl_turn_on_agg(struct iwl_mvm
*mvm
, u8 tid
,
563 struct iwl_lq_sta
*lq_data
,
564 struct ieee80211_sta
*sta
)
566 if (tid
< IWL_MAX_TID_COUNT
)
567 rs_tl_turn_on_agg_for_tid(mvm
, lq_data
, tid
, sta
);
569 IWL_ERR(mvm
, "tid exceeds max TID count: %d/%d\n",
570 tid
, IWL_MAX_TID_COUNT
);
573 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
575 return !!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
576 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
577 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
);
581 * Static function to get the expected throughput from an iwl_scale_tbl_info
582 * that wraps a NULL pointer check
584 static s32
get_expected_tpt(struct iwl_scale_tbl_info
*tbl
, int rs_index
)
586 if (tbl
->expected_tpt
)
587 return tbl
->expected_tpt
[rs_index
];
592 * rs_collect_tx_data - Update the success/failure sliding window
594 * We keep a sliding window of the last 62 packets transmitted
595 * at this rate. window->data contains the bitmask of successful
598 static int _rs_collect_tx_data(struct iwl_scale_tbl_info
*tbl
,
599 int scale_index
, int attempts
, int successes
,
600 struct iwl_rate_scale_data
*window
)
602 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
605 /* Get expected throughput */
606 tpt
= get_expected_tpt(tbl
, scale_index
);
609 * Keep track of only the latest 62 tx frame attempts in this rate's
610 * history window; anything older isn't really relevant any more.
611 * If we have filled up the sliding window, drop the oldest attempt;
612 * if the oldest attempt (highest bit in bitmap) shows "success",
613 * subtract "1" from the success counter (this is the main reason
614 * we keep these bitmaps!).
616 while (attempts
> 0) {
617 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
618 /* remove earliest */
619 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
621 if (window
->data
& mask
) {
622 window
->data
&= ~mask
;
623 window
->success_counter
--;
627 /* Increment frames-attempted counter */
630 /* Shift bitmap by one frame to throw away oldest history */
633 /* Mark the most recent #successes attempts as successful */
635 window
->success_counter
++;
643 /* Calculate current success ratio, avoid divide-by-0! */
644 if (window
->counter
> 0)
645 window
->success_ratio
= 128 * (100 * window
->success_counter
)
648 window
->success_ratio
= IWL_INVALID_VALUE
;
650 fail_count
= window
->counter
- window
->success_counter
;
652 /* Calculate average throughput, if we have enough history. */
653 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
654 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
655 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
657 window
->average_tpt
= IWL_INVALID_VALUE
;
662 static int rs_collect_tx_data(struct iwl_lq_sta
*lq_sta
,
663 struct iwl_scale_tbl_info
*tbl
,
664 int scale_index
, int attempts
, int successes
,
667 struct iwl_rate_scale_data
*window
= NULL
;
670 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
673 if (tbl
->column
!= RS_COLUMN_INVALID
) {
674 lq_sta
->tx_stats
[tbl
->column
][scale_index
].total
+= attempts
;
675 lq_sta
->tx_stats
[tbl
->column
][scale_index
].success
+= successes
;
678 /* Select window for current tx bit rate */
679 window
= &(tbl
->win
[scale_index
]);
681 ret
= _rs_collect_tx_data(tbl
, scale_index
, attempts
, successes
,
686 if (WARN_ON_ONCE(reduced_txp
> TPC_MAX_REDUCTION
))
689 window
= &tbl
->tpc_win
[reduced_txp
];
690 return _rs_collect_tx_data(tbl
, scale_index
, attempts
, successes
,
694 /* Convert rs_rate object into ucode rate bitmask */
695 static u32
ucode_rate_from_rs_rate(struct iwl_mvm
*mvm
,
696 struct rs_rate
*rate
)
699 int index
= rate
->index
;
701 ucode_rate
|= ((rate
->ant
<< RATE_MCS_ANT_POS
) &
702 RATE_MCS_ANT_ABC_MSK
);
704 if (is_legacy(rate
)) {
705 ucode_rate
|= iwl_rates
[index
].plcp
;
706 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
707 ucode_rate
|= RATE_MCS_CCK_MSK
;
712 if (index
< IWL_FIRST_HT_RATE
|| index
> IWL_LAST_HT_RATE
) {
713 IWL_ERR(mvm
, "Invalid HT rate index %d\n", index
);
714 index
= IWL_LAST_HT_RATE
;
716 ucode_rate
|= RATE_MCS_HT_MSK
;
718 if (is_ht_siso(rate
))
719 ucode_rate
|= iwl_rates
[index
].plcp_ht_siso
;
720 else if (is_ht_mimo2(rate
))
721 ucode_rate
|= iwl_rates
[index
].plcp_ht_mimo2
;
724 } else if (is_vht(rate
)) {
725 if (index
< IWL_FIRST_VHT_RATE
|| index
> IWL_LAST_VHT_RATE
) {
726 IWL_ERR(mvm
, "Invalid VHT rate index %d\n", index
);
727 index
= IWL_LAST_VHT_RATE
;
729 ucode_rate
|= RATE_MCS_VHT_MSK
;
730 if (is_vht_siso(rate
))
731 ucode_rate
|= iwl_rates
[index
].plcp_vht_siso
;
732 else if (is_vht_mimo2(rate
))
733 ucode_rate
|= iwl_rates
[index
].plcp_vht_mimo2
;
738 IWL_ERR(mvm
, "Invalid rate->type %d\n", rate
->type
);
741 ucode_rate
|= rate
->bw
;
743 ucode_rate
|= RATE_MCS_SGI_MSK
;
748 /* Convert a ucode rate into an rs_rate object */
749 static int rs_rate_from_ucode_rate(const u32 ucode_rate
,
750 enum ieee80211_band band
,
751 struct rs_rate
*rate
)
753 u32 ant_msk
= ucode_rate
& RATE_MCS_ANT_ABC_MSK
;
754 u8 num_of_ant
= get_num_of_ant_from_rate(ucode_rate
);
757 memset(rate
, 0, sizeof(*rate
));
758 rate
->index
= iwl_hwrate_to_plcp_idx(ucode_rate
);
760 if (rate
->index
== IWL_RATE_INVALID
)
763 rate
->ant
= (ant_msk
>> RATE_MCS_ANT_POS
);
766 if (!(ucode_rate
& RATE_MCS_HT_MSK
) &&
767 !(ucode_rate
& RATE_MCS_VHT_MSK
)) {
768 if (num_of_ant
== 1) {
769 if (band
== IEEE80211_BAND_5GHZ
)
770 rate
->type
= LQ_LEGACY_A
;
772 rate
->type
= LQ_LEGACY_G
;
779 if (ucode_rate
& RATE_MCS_SGI_MSK
)
782 rate
->bw
= ucode_rate
& RATE_MCS_CHAN_WIDTH_MSK
;
784 if (ucode_rate
& RATE_MCS_HT_MSK
) {
785 nss
= ((ucode_rate
& RATE_HT_MCS_NSS_MSK
) >>
786 RATE_HT_MCS_NSS_POS
) + 1;
789 rate
->type
= LQ_HT_SISO
;
790 WARN_ON_ONCE(num_of_ant
!= 1);
791 } else if (nss
== 2) {
792 rate
->type
= LQ_HT_MIMO2
;
793 WARN_ON_ONCE(num_of_ant
!= 2);
797 } else if (ucode_rate
& RATE_MCS_VHT_MSK
) {
798 nss
= ((ucode_rate
& RATE_VHT_MCS_NSS_MSK
) >>
799 RATE_VHT_MCS_NSS_POS
) + 1;
802 rate
->type
= LQ_VHT_SISO
;
803 WARN_ON_ONCE(num_of_ant
!= 1);
804 } else if (nss
== 2) {
805 rate
->type
= LQ_VHT_MIMO2
;
806 WARN_ON_ONCE(num_of_ant
!= 2);
812 WARN_ON_ONCE(rate
->bw
== RATE_MCS_CHAN_WIDTH_160
);
813 WARN_ON_ONCE(rate
->bw
== RATE_MCS_CHAN_WIDTH_80
&&
819 /* switch to another antenna/antennas and return 1 */
820 /* if no other valid antenna found, return 0 */
821 static int rs_toggle_antenna(u32 valid_ant
, struct rs_rate
*rate
)
825 if (!rate
->ant
|| rate
->ant
> ANT_ABC
)
828 if (!rs_is_valid_ant(valid_ant
, rate
->ant
))
831 new_ant_type
= ant_toggle_lookup
[rate
->ant
];
833 while ((new_ant_type
!= rate
->ant
) &&
834 !rs_is_valid_ant(valid_ant
, new_ant_type
))
835 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
837 if (new_ant_type
== rate
->ant
)
840 rate
->ant
= new_ant_type
;
845 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
846 struct rs_rate
*rate
)
849 return lq_sta
->active_legacy_rate
;
850 else if (is_siso(rate
))
851 return lq_sta
->active_siso_rate
;
852 else if (is_mimo2(rate
))
853 return lq_sta
->active_mimo2_rate
;
859 static u16
rs_get_adjacent_rate(struct iwl_mvm
*mvm
, u8 index
, u16 rate_mask
,
862 u8 high
= IWL_RATE_INVALID
;
863 u8 low
= IWL_RATE_INVALID
;
865 /* 802.11A or ht walks to the next literal adjacent rate in
867 if (is_type_a_band(rate_type
) || !is_type_legacy(rate_type
)) {
871 /* Find the previous rate that is in the rate mask */
873 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
874 if (rate_mask
& mask
) {
880 /* Find the next rate that is in the rate mask */
882 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
883 if (rate_mask
& mask
) {
889 return (high
<< 8) | low
;
893 while (low
!= IWL_RATE_INVALID
) {
894 low
= iwl_rates
[low
].prev_rs
;
895 if (low
== IWL_RATE_INVALID
)
897 if (rate_mask
& (1 << low
))
899 IWL_DEBUG_RATE(mvm
, "Skipping masked lower rate: %d\n", low
);
903 while (high
!= IWL_RATE_INVALID
) {
904 high
= iwl_rates
[high
].next_rs
;
905 if (high
== IWL_RATE_INVALID
)
907 if (rate_mask
& (1 << high
))
909 IWL_DEBUG_RATE(mvm
, "Skipping masked higher rate: %d\n", high
);
912 return (high
<< 8) | low
;
915 static inline bool rs_rate_supported(struct iwl_lq_sta
*lq_sta
,
916 struct rs_rate
*rate
)
918 return BIT(rate
->index
) & rs_get_supported_rates(lq_sta
, rate
);
921 /* Get the next supported lower rate in the current column.
922 * Return true if bottom rate in the current column was reached
924 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta
*lq_sta
,
925 struct rs_rate
*rate
)
930 struct iwl_mvm
*mvm
= lq_sta
->drv
;
932 rate_mask
= rs_get_supported_rates(lq_sta
, rate
);
933 high_low
= rs_get_adjacent_rate(mvm
, rate
->index
, rate_mask
,
935 low
= high_low
& 0xff;
937 /* Bottom rate of column reached */
938 if (low
== IWL_RATE_INVALID
)
945 /* Get the next rate to use following a column downgrade */
946 static void rs_get_lower_rate_down_column(struct iwl_lq_sta
*lq_sta
,
947 struct rs_rate
*rate
)
949 struct iwl_mvm
*mvm
= lq_sta
->drv
;
951 if (is_legacy(rate
)) {
952 /* No column to downgrade from Legacy */
954 } else if (is_siso(rate
)) {
955 /* Downgrade to Legacy if we were in SISO */
956 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
957 rate
->type
= LQ_LEGACY_A
;
959 rate
->type
= LQ_LEGACY_G
;
961 rate
->bw
= RATE_MCS_CHAN_WIDTH_20
;
963 WARN_ON_ONCE(rate
->index
< IWL_RATE_MCS_0_INDEX
||
964 rate
->index
> IWL_RATE_MCS_9_INDEX
);
966 rate
->index
= rs_ht_to_legacy
[rate
->index
];
968 /* Downgrade to SISO with same MCS if in MIMO */
969 rate
->type
= is_vht_mimo2(rate
) ?
970 LQ_VHT_SISO
: LQ_HT_SISO
;
974 if (num_of_ant(rate
->ant
) > 1)
975 rate
->ant
= first_antenna(mvm
->fw
->valid_tx_ant
);
977 /* Relevant in both switching to SISO or Legacy */
980 if (!rs_rate_supported(lq_sta
, rate
))
981 rs_get_lower_rate_in_column(lq_sta
, rate
);
984 /* Simple function to compare two rate scale table types */
985 static inline bool rs_rate_match(struct rs_rate
*a
,
988 return (a
->type
== b
->type
) && (a
->ant
== b
->ant
) && (a
->sgi
== b
->sgi
);
991 static u32
rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags
)
993 if (flags
& IEEE80211_TX_RC_40_MHZ_WIDTH
)
994 return RATE_MCS_CHAN_WIDTH_40
;
995 else if (flags
& IEEE80211_TX_RC_80_MHZ_WIDTH
)
996 return RATE_MCS_CHAN_WIDTH_80
;
997 else if (flags
& IEEE80211_TX_RC_160_MHZ_WIDTH
)
998 return RATE_MCS_CHAN_WIDTH_160
;
1000 return RATE_MCS_CHAN_WIDTH_20
;
1004 * mac80211 sends us Tx status
1006 static void rs_tx_status(void *mvm_r
, struct ieee80211_supported_band
*sband
,
1007 struct ieee80211_sta
*sta
, void *priv_sta
,
1008 struct sk_buff
*skb
)
1013 struct iwl_lq_sta
*lq_sta
= priv_sta
;
1014 struct iwl_lq_cmd
*table
;
1015 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1016 struct iwl_op_mode
*op_mode
= (struct iwl_op_mode
*)mvm_r
;
1017 struct iwl_mvm
*mvm
= IWL_OP_MODE_GET_MVM(op_mode
);
1018 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1019 enum mac80211_rate_control_flags mac_flags
;
1021 struct rs_rate rate
;
1022 struct iwl_scale_tbl_info
*curr_tbl
, *other_tbl
, *tmp_tbl
;
1023 u8 reduced_txp
= (uintptr_t)info
->status
.status_driver_data
[0];
1025 /* Treat uninitialized rate scaling data same as non-existing. */
1027 IWL_DEBUG_RATE(mvm
, "Station rate scaling not created yet.\n");
1029 } else if (!lq_sta
->drv
) {
1030 IWL_DEBUG_RATE(mvm
, "Rate scaling not initialized yet.\n");
1034 #ifdef CONFIG_MAC80211_DEBUGFS
1035 /* Disable last tx check if we are debugging with fixed rate */
1036 if (lq_sta
->dbg_fixed_rate
) {
1037 IWL_DEBUG_RATE(mvm
, "Fixed rate. avoid rate scaling\n");
1041 if (!ieee80211_is_data(hdr
->frame_control
) ||
1042 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
1045 /* This packet was aggregated but doesn't carry status info */
1046 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
1047 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
1051 * Ignore this Tx frame response if its initial rate doesn't match
1052 * that of latest Link Quality command. There may be stragglers
1053 * from a previous Link Quality command, but we're no longer interested
1054 * in those; they're either from the "active" mode while we're trying
1055 * to check "search" mode, or a prior "search" mode after we've moved
1056 * to a new "search" mode (which might become the new "active" mode).
1058 table
= &lq_sta
->lq
;
1059 ucode_rate
= le32_to_cpu(table
->rs_table
[0]);
1060 rs_rate_from_ucode_rate(ucode_rate
, info
->band
, &rate
);
1061 if (info
->band
== IEEE80211_BAND_5GHZ
)
1062 rate
.index
-= IWL_FIRST_OFDM_RATE
;
1063 mac_flags
= info
->status
.rates
[0].flags
;
1064 mac_index
= info
->status
.rates
[0].idx
;
1065 /* For HT packets, map MCS to PLCP */
1066 if (mac_flags
& IEEE80211_TX_RC_MCS
) {
1067 /* Remove # of streams */
1068 mac_index
&= RATE_HT_MCS_RATE_CODE_MSK
;
1069 if (mac_index
>= (IWL_RATE_9M_INDEX
- IWL_FIRST_OFDM_RATE
))
1072 * mac80211 HT index is always zero-indexed; we need to move
1073 * HT OFDM rates after CCK rates in 2.4 GHz band
1075 if (info
->band
== IEEE80211_BAND_2GHZ
)
1076 mac_index
+= IWL_FIRST_OFDM_RATE
;
1077 } else if (mac_flags
& IEEE80211_TX_RC_VHT_MCS
) {
1078 mac_index
&= RATE_VHT_MCS_RATE_CODE_MSK
;
1079 if (mac_index
>= (IWL_RATE_9M_INDEX
- IWL_FIRST_OFDM_RATE
))
1083 if (time_after(jiffies
,
1084 (unsigned long)(lq_sta
->last_tx
+ RS_IDLE_TIMEOUT
))) {
1086 IWL_DEBUG_RATE(mvm
, "Tx idle for too long. reinit rs\n");
1087 for (tid
= 0; tid
< IWL_MAX_TID_COUNT
; tid
++)
1088 ieee80211_stop_tx_ba_session(sta
, tid
);
1090 iwl_mvm_rs_rate_init(mvm
, sta
, sband
->band
, false);
1093 lq_sta
->last_tx
= jiffies
;
1095 /* Here we actually compare this rate to the latest LQ command */
1096 if ((mac_index
< 0) ||
1097 (rate
.sgi
!= !!(mac_flags
& IEEE80211_TX_RC_SHORT_GI
)) ||
1098 (rate
.bw
!= rs_ch_width_from_mac_flags(mac_flags
)) ||
1099 (rate
.ant
!= info
->status
.antenna
) ||
1100 (!!(ucode_rate
& RATE_MCS_HT_MSK
) !=
1101 !!(mac_flags
& IEEE80211_TX_RC_MCS
)) ||
1102 (!!(ucode_rate
& RATE_MCS_VHT_MSK
) !=
1103 !!(mac_flags
& IEEE80211_TX_RC_VHT_MCS
)) ||
1104 (!!(ucode_rate
& RATE_HT_MCS_GF_MSK
) !=
1105 !!(mac_flags
& IEEE80211_TX_RC_GREEN_FIELD
)) ||
1106 (rate
.index
!= mac_index
)) {
1108 "initial rate %d does not match %d (0x%x)\n",
1109 mac_index
, rate
.index
, ucode_rate
);
1111 * Since rates mis-match, the last LQ command may have failed.
1112 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1115 lq_sta
->missed_rate_counter
++;
1116 if (lq_sta
->missed_rate_counter
> IWL_MISSED_RATE_MAX
) {
1117 lq_sta
->missed_rate_counter
= 0;
1119 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1121 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, false);
1123 /* Regardless, ignore this status info for outdated rate */
1126 /* Rate did match, so reset the missed_rate_counter */
1127 lq_sta
->missed_rate_counter
= 0;
1129 /* Figure out if rate scale algorithm is in active or search table */
1130 if (rs_rate_match(&rate
,
1131 &(lq_sta
->lq_info
[lq_sta
->active_tbl
].rate
))) {
1132 curr_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1133 other_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1134 } else if (rs_rate_match(&rate
,
1135 &lq_sta
->lq_info
[1 - lq_sta
->active_tbl
].rate
)) {
1136 curr_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1137 other_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
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
, &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 ucode_rate
= le32_to_cpu(table
->rs_table
[0]);
1164 rs_rate_from_ucode_rate(ucode_rate
, info
->band
, &rate
);
1165 rs_collect_tx_data(lq_sta
, curr_tbl
, rate
.index
,
1166 info
->status
.ampdu_len
,
1167 info
->status
.ampdu_ack_len
,
1170 /* Update success/fail counts if not searching for new mode */
1171 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
) {
1172 lq_sta
->total_success
+= info
->status
.ampdu_ack_len
;
1173 lq_sta
->total_failed
+= (info
->status
.ampdu_len
-
1174 info
->status
.ampdu_ack_len
);
1178 * For legacy, update frame history with for each Tx retry.
1180 retries
= info
->status
.rates
[0].count
- 1;
1181 /* HW doesn't send more than 15 retries */
1182 retries
= min(retries
, 15);
1184 /* The last transmission may have been successful */
1185 legacy_success
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
1186 /* Collect data for each rate used during failed TX attempts */
1187 for (i
= 0; i
<= retries
; ++i
) {
1188 ucode_rate
= le32_to_cpu(table
->rs_table
[i
]);
1189 rs_rate_from_ucode_rate(ucode_rate
, info
->band
, &rate
);
1191 * Only collect stats if retried rate is in the same RS
1192 * table as active/search.
1194 if (rs_rate_match(&rate
, &curr_tbl
->rate
))
1196 else if (rs_rate_match(&rate
, &other_tbl
->rate
))
1197 tmp_tbl
= other_tbl
;
1201 rs_collect_tx_data(lq_sta
, tmp_tbl
, rate
.index
, 1,
1202 i
< retries
? 0 : legacy_success
,
1206 /* Update success/fail counts if not searching for new mode */
1207 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
) {
1208 lq_sta
->total_success
+= legacy_success
;
1209 lq_sta
->total_failed
+= retries
+ (1 - legacy_success
);
1212 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1213 lq_sta
->last_rate_n_flags
= ucode_rate
;
1214 IWL_DEBUG_RATE(mvm
, "reduced txpower: %d\n", reduced_txp
);
1216 /* See if there's a better rate or modulation mode to try. */
1217 if (sta
&& sta
->supp_rates
[sband
->band
])
1218 rs_rate_scale_perform(mvm
, skb
, sta
, lq_sta
);
1222 * Begin a period of staying with a selected modulation mode.
1223 * Set "stay_in_tbl" flag to prevent any mode switches.
1224 * Set frame tx success limits according to legacy vs. high-throughput,
1225 * and reset overall (spanning all rates) tx success history statistics.
1226 * These control how long we stay using same modulation mode before
1227 * searching for a new mode.
1229 static void rs_set_stay_in_table(struct iwl_mvm
*mvm
, u8 is_legacy
,
1230 struct iwl_lq_sta
*lq_sta
)
1232 IWL_DEBUG_RATE(mvm
, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1233 lq_sta
->rs_state
= RS_STATE_STAY_IN_COLUMN
;
1235 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
1236 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
1237 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
1239 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
1240 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
1241 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
1243 lq_sta
->table_count
= 0;
1244 lq_sta
->total_failed
= 0;
1245 lq_sta
->total_success
= 0;
1246 lq_sta
->flush_timer
= jiffies
;
1247 lq_sta
->visited_columns
= 0;
1250 static int rs_get_max_allowed_rate(struct iwl_lq_sta
*lq_sta
,
1251 const struct rs_tx_column
*column
)
1253 switch (column
->mode
) {
1255 return lq_sta
->max_legacy_rate_idx
;
1257 return lq_sta
->max_siso_rate_idx
;
1259 return lq_sta
->max_mimo2_rate_idx
;
1264 return lq_sta
->max_legacy_rate_idx
;
1267 static const u16
*rs_get_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1268 const struct rs_tx_column
*column
,
1271 /* Used to choose among HT tables */
1272 const u16 (*ht_tbl_pointer
)[IWL_RATE_COUNT
];
1274 if (WARN_ON_ONCE(column
->mode
!= RS_LEGACY
&&
1275 column
->mode
!= RS_SISO
&&
1276 column
->mode
!= RS_MIMO2
))
1277 return expected_tpt_legacy
;
1279 /* Legacy rates have only one table */
1280 if (column
->mode
== RS_LEGACY
)
1281 return expected_tpt_legacy
;
1283 ht_tbl_pointer
= expected_tpt_mimo2_20MHz
;
1284 /* Choose among many HT tables depending on number of streams
1285 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1287 if (column
->mode
== RS_SISO
) {
1289 case RATE_MCS_CHAN_WIDTH_20
:
1290 ht_tbl_pointer
= expected_tpt_siso_20MHz
;
1292 case RATE_MCS_CHAN_WIDTH_40
:
1293 ht_tbl_pointer
= expected_tpt_siso_40MHz
;
1295 case RATE_MCS_CHAN_WIDTH_80
:
1296 ht_tbl_pointer
= expected_tpt_siso_80MHz
;
1301 } else if (column
->mode
== RS_MIMO2
) {
1303 case RATE_MCS_CHAN_WIDTH_20
:
1304 ht_tbl_pointer
= expected_tpt_mimo2_20MHz
;
1306 case RATE_MCS_CHAN_WIDTH_40
:
1307 ht_tbl_pointer
= expected_tpt_mimo2_40MHz
;
1309 case RATE_MCS_CHAN_WIDTH_80
:
1310 ht_tbl_pointer
= expected_tpt_mimo2_80MHz
;
1319 if (!column
->sgi
&& !lq_sta
->is_agg
) /* Normal */
1320 return ht_tbl_pointer
[0];
1321 else if (column
->sgi
&& !lq_sta
->is_agg
) /* SGI */
1322 return ht_tbl_pointer
[1];
1323 else if (!column
->sgi
&& lq_sta
->is_agg
) /* AGG */
1324 return ht_tbl_pointer
[2];
1326 return ht_tbl_pointer
[3];
1329 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1330 struct iwl_scale_tbl_info
*tbl
)
1332 struct rs_rate
*rate
= &tbl
->rate
;
1333 const struct rs_tx_column
*column
= &rs_tx_columns
[tbl
->column
];
1335 tbl
->expected_tpt
= rs_get_expected_tpt_table(lq_sta
, column
, rate
->bw
);
1339 * Find starting rate for new "search" high-throughput mode of modulation.
1340 * Goal is to find lowest expected rate (under perfect conditions) that is
1341 * above the current measured throughput of "active" mode, to give new mode
1342 * a fair chance to prove itself without too many challenges.
1344 * This gets called when transitioning to more aggressive modulation
1345 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1346 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1347 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1348 * bit rate will typically need to increase, but not if performance was bad.
1350 static s32
rs_get_best_rate(struct iwl_mvm
*mvm
,
1351 struct iwl_lq_sta
*lq_sta
,
1352 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1353 u16 rate_mask
, s8 index
)
1355 /* "active" values */
1356 struct iwl_scale_tbl_info
*active_tbl
=
1357 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1358 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1359 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1360 /* expected "search" throughput */
1361 const u16
*tpt_tbl
= tbl
->expected_tpt
;
1363 s32 new_rate
, high
, low
, start_hi
;
1367 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1370 high_low
= rs_get_adjacent_rate(mvm
, rate
, rate_mask
,
1373 low
= high_low
& 0xff;
1374 high
= (high_low
>> 8) & 0xff;
1377 * Lower the "search" bit rate, to give new "search" mode
1378 * approximately the same throughput as "active" if:
1380 * 1) "Active" mode has been working modestly well (but not
1381 * great), and expected "search" throughput (under perfect
1382 * conditions) at candidate rate is above the actual
1383 * measured "active" throughput (but less than expected
1384 * "active" throughput under perfect conditions).
1386 * 2) "Active" mode has been working perfectly or very well
1387 * and expected "search" throughput (under perfect
1388 * conditions) at candidate rate is above expected
1389 * "active" throughput (under perfect conditions).
1391 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1392 ((active_sr
> RS_SR_FORCE_DECREASE
) &&
1393 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1394 (tpt_tbl
[rate
] <= active_tpt
))) ||
1395 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1396 (tpt_tbl
[rate
] > active_tpt
))) {
1397 /* (2nd or later pass)
1398 * If we've already tried to raise the rate, and are
1399 * now trying to lower it, use the higher rate. */
1400 if (start_hi
!= IWL_RATE_INVALID
) {
1401 new_rate
= start_hi
;
1407 /* Loop again with lower rate */
1408 if (low
!= IWL_RATE_INVALID
)
1411 /* Lower rate not available, use the original */
1415 /* Else try to raise the "search" rate to match "active" */
1417 /* (2nd or later pass)
1418 * If we've already tried to lower the rate, and are
1419 * now trying to raise it, use the lower rate. */
1420 if (new_rate
!= IWL_RATE_INVALID
)
1423 /* Loop again with higher rate */
1424 else if (high
!= IWL_RATE_INVALID
) {
1428 /* Higher rate not available, use the original */
1439 static u32
rs_bw_from_sta_bw(struct ieee80211_sta
*sta
)
1441 if (sta
->bandwidth
>= IEEE80211_STA_RX_BW_80
)
1442 return RATE_MCS_CHAN_WIDTH_80
;
1443 else if (sta
->bandwidth
>= IEEE80211_STA_RX_BW_40
)
1444 return RATE_MCS_CHAN_WIDTH_40
;
1446 return RATE_MCS_CHAN_WIDTH_20
;
1450 * Check whether we should continue using same modulation mode, or
1451 * begin search for a new mode, based on:
1452 * 1) # tx successes or failures while using this mode
1453 * 2) # times calling this function
1454 * 3) elapsed time in this mode (not used, for now)
1456 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
, bool force_search
)
1458 struct iwl_scale_tbl_info
*tbl
;
1460 int flush_interval_passed
= 0;
1461 struct iwl_mvm
*mvm
;
1464 active_tbl
= lq_sta
->active_tbl
;
1466 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1468 /* If we've been disallowing search, see if we should now allow it */
1469 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
) {
1470 /* Elapsed time using current modulation mode */
1471 if (lq_sta
->flush_timer
)
1472 flush_interval_passed
=
1474 (unsigned long)(lq_sta
->flush_timer
+
1475 RS_STAY_IN_COLUMN_TIMEOUT
));
1478 * Check if we should allow search for new modulation mode.
1479 * If many frames have failed or succeeded, or we've used
1480 * this same modulation for a long time, allow search, and
1481 * reset history stats that keep track of whether we should
1482 * allow a new search. Also (below) reset all bitmaps and
1483 * stats in active history.
1486 (lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1487 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1488 ((!lq_sta
->search_better_tbl
) &&
1489 (lq_sta
->flush_timer
) && (flush_interval_passed
))) {
1491 "LQ: stay is expired %d %d %d\n",
1492 lq_sta
->total_failed
,
1493 lq_sta
->total_success
,
1494 flush_interval_passed
);
1496 /* Allow search for new mode */
1497 lq_sta
->rs_state
= RS_STATE_SEARCH_CYCLE_STARTED
;
1499 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1500 lq_sta
->total_failed
= 0;
1501 lq_sta
->total_success
= 0;
1502 lq_sta
->flush_timer
= 0;
1503 /* mark the current column as visited */
1504 lq_sta
->visited_columns
= BIT(tbl
->column
);
1506 * Else if we've used this modulation mode enough repetitions
1507 * (regardless of elapsed time or success/failure), reset
1508 * history bitmaps and rate-specific stats for all rates in
1512 lq_sta
->table_count
++;
1513 if (lq_sta
->table_count
>=
1514 lq_sta
->table_count_limit
) {
1515 lq_sta
->table_count
= 0;
1518 "LQ: stay in table clear win\n");
1519 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
1523 /* If transitioning to allow "search", reset all history
1524 * bitmaps and stats in active table (this will become the new
1525 * "search" table). */
1526 if (lq_sta
->rs_state
== RS_STATE_SEARCH_CYCLE_STARTED
) {
1527 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
1533 * setup rate table in uCode
1535 static void rs_update_rate_tbl(struct iwl_mvm
*mvm
,
1536 struct ieee80211_sta
*sta
,
1537 struct iwl_lq_sta
*lq_sta
,
1538 struct rs_rate
*rate
)
1540 rs_fill_lq_cmd(mvm
, sta
, lq_sta
, rate
);
1541 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, false);
1544 static u8
rs_get_tid(struct iwl_lq_sta
*lq_data
,
1545 struct ieee80211_hdr
*hdr
)
1547 u8 tid
= IWL_MAX_TID_COUNT
;
1549 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
1550 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
1554 if (unlikely(tid
> IWL_MAX_TID_COUNT
))
1555 tid
= IWL_MAX_TID_COUNT
;
1560 static enum rs_column
rs_get_next_column(struct iwl_mvm
*mvm
,
1561 struct iwl_lq_sta
*lq_sta
,
1562 struct ieee80211_sta
*sta
,
1563 struct iwl_scale_tbl_info
*tbl
)
1566 enum rs_column next_col_id
;
1567 const struct rs_tx_column
*curr_col
= &rs_tx_columns
[tbl
->column
];
1568 const struct rs_tx_column
*next_col
;
1569 allow_column_func_t allow_func
;
1570 u8 valid_ants
= mvm
->fw
->valid_tx_ant
;
1571 const u16
*expected_tpt_tbl
;
1572 u16 tpt
, max_expected_tpt
;
1574 for (i
= 0; i
< MAX_NEXT_COLUMNS
; i
++) {
1575 next_col_id
= curr_col
->next_columns
[i
];
1577 if (next_col_id
== RS_COLUMN_INVALID
)
1580 if (lq_sta
->visited_columns
& BIT(next_col_id
)) {
1581 IWL_DEBUG_RATE(mvm
, "Skip already visited column %d\n",
1586 next_col
= &rs_tx_columns
[next_col_id
];
1588 if (!rs_is_valid_ant(valid_ants
, next_col
->ant
)) {
1590 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1591 next_col_id
, valid_ants
, next_col
->ant
);
1595 for (j
= 0; j
< MAX_COLUMN_CHECKS
; j
++) {
1596 allow_func
= next_col
->checks
[j
];
1597 if (allow_func
&& !allow_func(mvm
, sta
, tbl
))
1601 if (j
!= MAX_COLUMN_CHECKS
) {
1603 "Skip column %d: not allowed (check %d failed)\n",
1609 tpt
= lq_sta
->last_tpt
/ 100;
1610 expected_tpt_tbl
= rs_get_expected_tpt_table(lq_sta
, next_col
,
1612 if (WARN_ON_ONCE(!expected_tpt_tbl
))
1615 max_rate
= rs_get_max_allowed_rate(lq_sta
, next_col
);
1616 if (WARN_ON_ONCE(max_rate
== IWL_RATE_INVALID
))
1619 max_expected_tpt
= expected_tpt_tbl
[max_rate
];
1620 if (tpt
>= max_expected_tpt
) {
1622 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1623 next_col_id
, max_expected_tpt
, tpt
);
1628 "Found potential column %d. Max expected %d current %d\n",
1629 next_col_id
, max_expected_tpt
, tpt
);
1633 if (i
== MAX_NEXT_COLUMNS
)
1634 return RS_COLUMN_INVALID
;
1639 static int rs_switch_to_column(struct iwl_mvm
*mvm
,
1640 struct iwl_lq_sta
*lq_sta
,
1641 struct ieee80211_sta
*sta
,
1642 enum rs_column col_id
)
1644 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1645 struct iwl_scale_tbl_info
*search_tbl
=
1646 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1647 struct rs_rate
*rate
= &search_tbl
->rate
;
1648 const struct rs_tx_column
*column
= &rs_tx_columns
[col_id
];
1649 const struct rs_tx_column
*curr_column
= &rs_tx_columns
[tbl
->column
];
1650 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1651 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1655 memcpy(search_tbl
, tbl
, sz
);
1657 rate
->sgi
= column
->sgi
;
1658 rate
->ant
= column
->ant
;
1660 if (column
->mode
== RS_LEGACY
) {
1661 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1662 rate
->type
= LQ_LEGACY_A
;
1664 rate
->type
= LQ_LEGACY_G
;
1666 rate_mask
= lq_sta
->active_legacy_rate
;
1667 } else if (column
->mode
== RS_SISO
) {
1668 rate
->type
= lq_sta
->is_vht
? LQ_VHT_SISO
: LQ_HT_SISO
;
1669 rate_mask
= lq_sta
->active_siso_rate
;
1670 } else if (column
->mode
== RS_MIMO2
) {
1671 rate
->type
= lq_sta
->is_vht
? LQ_VHT_MIMO2
: LQ_HT_MIMO2
;
1672 rate_mask
= lq_sta
->active_mimo2_rate
;
1674 WARN_ON_ONCE("Bad column mode");
1677 rate
->bw
= rs_bw_from_sta_bw(sta
);
1678 search_tbl
->column
= col_id
;
1679 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1681 lq_sta
->visited_columns
|= BIT(col_id
);
1683 /* Get the best matching rate if we're changing modes. e.g.
1684 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1686 if (curr_column
->mode
!= column
->mode
) {
1687 rate_idx
= rs_get_best_rate(mvm
, lq_sta
, search_tbl
,
1688 rate_mask
, rate
->index
);
1690 if ((rate_idx
== IWL_RATE_INVALID
) ||
1691 !(BIT(rate_idx
) & rate_mask
)) {
1693 "can not switch with index %d"
1695 rate_idx
, rate_mask
);
1700 rate
->index
= rate_idx
;
1703 IWL_DEBUG_RATE(mvm
, "Switched to column %d: Index %d\n",
1704 col_id
, rate
->index
);
1709 rate
->type
= LQ_NONE
;
1713 static enum rs_action
rs_get_rate_action(struct iwl_mvm
*mvm
,
1714 struct iwl_scale_tbl_info
*tbl
,
1715 s32 sr
, int low
, int high
,
1717 int low_tpt
, int high_tpt
)
1719 enum rs_action action
= RS_ACTION_STAY
;
1721 if ((sr
<= RS_SR_FORCE_DECREASE
) || (current_tpt
== 0)) {
1723 "Decrease rate because of low SR\n");
1724 return RS_ACTION_DOWNSCALE
;
1727 if ((low_tpt
== IWL_INVALID_VALUE
) &&
1728 (high_tpt
== IWL_INVALID_VALUE
) &&
1729 (high
!= IWL_RATE_INVALID
)) {
1731 "No data about high/low rates. Increase rate\n");
1732 return RS_ACTION_UPSCALE
;
1735 if ((high_tpt
== IWL_INVALID_VALUE
) &&
1736 (high
!= IWL_RATE_INVALID
) &&
1737 (low_tpt
!= IWL_INVALID_VALUE
) &&
1738 (low_tpt
< current_tpt
)) {
1740 "No data about high rate and low rate is worse. Increase rate\n");
1741 return RS_ACTION_UPSCALE
;
1744 if ((high_tpt
!= IWL_INVALID_VALUE
) &&
1745 (high_tpt
> current_tpt
)) {
1747 "Higher rate is better. Increate rate\n");
1748 return RS_ACTION_UPSCALE
;
1751 if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1752 (high_tpt
!= IWL_INVALID_VALUE
) &&
1753 (low_tpt
< current_tpt
) &&
1754 (high_tpt
< current_tpt
)) {
1756 "Both high and low are worse. Maintain rate\n");
1757 return RS_ACTION_STAY
;
1760 if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1761 (low_tpt
> current_tpt
)) {
1763 "Lower rate is better\n");
1764 action
= RS_ACTION_DOWNSCALE
;
1768 if ((low_tpt
== IWL_INVALID_VALUE
) &&
1769 (low
!= IWL_RATE_INVALID
)) {
1771 "No data about lower rate\n");
1772 action
= RS_ACTION_DOWNSCALE
;
1776 IWL_DEBUG_RATE(mvm
, "Maintain rate\n");
1779 if ((action
== RS_ACTION_DOWNSCALE
) && (low
!= IWL_RATE_INVALID
)) {
1780 if (sr
>= RS_SR_NO_DECREASE
) {
1782 "SR is above NO DECREASE. Avoid downscale\n");
1783 action
= RS_ACTION_STAY
;
1784 } else if (current_tpt
> (100 * tbl
->expected_tpt
[low
])) {
1786 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1787 action
= RS_ACTION_STAY
;
1789 IWL_DEBUG_RATE(mvm
, "Decrease rate\n");
1796 static void rs_get_adjacent_txp(struct iwl_mvm
*mvm
, int index
,
1797 int *weaker
, int *stronger
)
1799 *weaker
= index
+ TPC_TX_POWER_STEP
;
1800 if (*weaker
> TPC_MAX_REDUCTION
)
1801 *weaker
= TPC_INVALID
;
1803 *stronger
= index
- TPC_TX_POWER_STEP
;
1805 *stronger
= TPC_INVALID
;
1808 static bool rs_tpc_allowed(struct iwl_mvm
*mvm
, struct rs_rate
*rate
,
1809 enum ieee80211_band band
)
1811 int index
= rate
->index
;
1814 * allow tpc only if power management is enabled, or bt coex
1815 * activity grade allows it and we are on 2.4Ghz.
1817 if (iwlmvm_mod_params
.power_scheme
== IWL_POWER_SCHEME_CAM
&&
1818 !iwl_mvm_bt_coex_is_tpc_allowed(mvm
, band
))
1821 IWL_DEBUG_RATE(mvm
, "check rate, table type: %d\n", rate
->type
);
1822 if (is_legacy(rate
))
1823 return index
== IWL_RATE_54M_INDEX
;
1825 return index
== IWL_RATE_MCS_7_INDEX
;
1827 return index
== IWL_RATE_MCS_7_INDEX
||
1828 index
== IWL_RATE_MCS_8_INDEX
||
1829 index
== IWL_RATE_MCS_9_INDEX
;
1837 TPC_ACTION_DECREASE
,
1838 TPC_ACTION_INCREASE
,
1839 TPC_ACTION_NO_RESTIRCTION
,
1842 static enum tpc_action
rs_get_tpc_action(struct iwl_mvm
*mvm
,
1843 s32 sr
, int weak
, int strong
,
1845 int weak_tpt
, int strong_tpt
)
1847 /* stay until we have valid tpt */
1848 if (current_tpt
== IWL_INVALID_VALUE
) {
1849 IWL_DEBUG_RATE(mvm
, "no current tpt. stay.\n");
1850 return TPC_ACTION_STAY
;
1853 /* Too many failures, increase txp */
1854 if (sr
<= TPC_SR_FORCE_INCREASE
|| current_tpt
== 0) {
1855 IWL_DEBUG_RATE(mvm
, "increase txp because of weak SR\n");
1856 return TPC_ACTION_NO_RESTIRCTION
;
1859 /* try decreasing first if applicable */
1860 if (weak
!= TPC_INVALID
) {
1861 if (weak_tpt
== IWL_INVALID_VALUE
&&
1862 (strong_tpt
== IWL_INVALID_VALUE
||
1863 current_tpt
>= strong_tpt
)) {
1865 "no weak txp measurement. decrease txp\n");
1866 return TPC_ACTION_DECREASE
;
1869 if (weak_tpt
> current_tpt
) {
1871 "lower txp has better tpt. decrease txp\n");
1872 return TPC_ACTION_DECREASE
;
1876 /* next, increase if needed */
1877 if (sr
< TPC_SR_NO_INCREASE
&& strong
!= TPC_INVALID
) {
1878 if (weak_tpt
== IWL_INVALID_VALUE
&&
1879 strong_tpt
!= IWL_INVALID_VALUE
&&
1880 current_tpt
< strong_tpt
) {
1882 "higher txp has better tpt. increase txp\n");
1883 return TPC_ACTION_INCREASE
;
1886 if (weak_tpt
< current_tpt
&&
1887 (strong_tpt
== IWL_INVALID_VALUE
||
1888 strong_tpt
> current_tpt
)) {
1890 "lower txp has worse tpt. increase txp\n");
1891 return TPC_ACTION_INCREASE
;
1895 IWL_DEBUG_RATE(mvm
, "no need to increase or decrease txp - stay\n");
1896 return TPC_ACTION_STAY
;
1899 static bool rs_tpc_perform(struct iwl_mvm
*mvm
,
1900 struct ieee80211_sta
*sta
,
1901 struct iwl_lq_sta
*lq_sta
,
1902 struct iwl_scale_tbl_info
*tbl
)
1904 struct iwl_mvm_sta
*mvm_sta
= (void *)sta
->drv_priv
;
1905 struct ieee80211_vif
*vif
= mvm_sta
->vif
;
1906 struct ieee80211_chanctx_conf
*chanctx_conf
;
1907 enum ieee80211_band band
;
1908 struct iwl_rate_scale_data
*window
;
1909 struct rs_rate
*rate
= &tbl
->rate
;
1910 enum tpc_action action
;
1912 u8 cur
= lq_sta
->lq
.reduced_tpc
;
1915 int weak_tpt
= IWL_INVALID_VALUE
, strong_tpt
= IWL_INVALID_VALUE
;
1917 #ifdef CONFIG_MAC80211_DEBUGFS
1918 if (lq_sta
->dbg_fixed_txp_reduction
<= TPC_MAX_REDUCTION
) {
1919 IWL_DEBUG_RATE(mvm
, "fixed tpc: %d",
1920 lq_sta
->dbg_fixed_txp_reduction
);
1921 lq_sta
->lq
.reduced_tpc
= lq_sta
->dbg_fixed_txp_reduction
;
1922 return cur
!= lq_sta
->dbg_fixed_txp_reduction
;
1927 chanctx_conf
= rcu_dereference(vif
->chanctx_conf
);
1928 if (WARN_ON(!chanctx_conf
))
1929 band
= IEEE80211_NUM_BANDS
;
1931 band
= chanctx_conf
->def
.chan
->band
;
1934 if (!rs_tpc_allowed(mvm
, rate
, band
)) {
1936 "tpc is not allowed. remove txp restrictions");
1937 lq_sta
->lq
.reduced_tpc
= TPC_NO_REDUCTION
;
1938 return cur
!= TPC_NO_REDUCTION
;
1941 rs_get_adjacent_txp(mvm
, cur
, &weak
, &strong
);
1943 /* Collect measured throughputs for current and adjacent rates */
1944 window
= tbl
->tpc_win
;
1945 sr
= window
[cur
].success_ratio
;
1946 current_tpt
= window
[cur
].average_tpt
;
1947 if (weak
!= TPC_INVALID
)
1948 weak_tpt
= window
[weak
].average_tpt
;
1949 if (strong
!= TPC_INVALID
)
1950 strong_tpt
= window
[strong
].average_tpt
;
1953 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1954 cur
, current_tpt
, sr
, weak
, strong
,
1955 weak_tpt
, strong_tpt
);
1957 action
= rs_get_tpc_action(mvm
, sr
, weak
, strong
,
1958 current_tpt
, weak_tpt
, strong_tpt
);
1960 /* override actions if we are on the edge */
1961 if (weak
== TPC_INVALID
&& action
== TPC_ACTION_DECREASE
) {
1962 IWL_DEBUG_RATE(mvm
, "already in lowest txp, stay");
1963 action
= TPC_ACTION_STAY
;
1964 } else if (strong
== TPC_INVALID
&&
1965 (action
== TPC_ACTION_INCREASE
||
1966 action
== TPC_ACTION_NO_RESTIRCTION
)) {
1967 IWL_DEBUG_RATE(mvm
, "already in highest txp, stay");
1968 action
= TPC_ACTION_STAY
;
1972 case TPC_ACTION_DECREASE
:
1973 lq_sta
->lq
.reduced_tpc
= weak
;
1975 case TPC_ACTION_INCREASE
:
1976 lq_sta
->lq
.reduced_tpc
= strong
;
1978 case TPC_ACTION_NO_RESTIRCTION
:
1979 lq_sta
->lq
.reduced_tpc
= TPC_NO_REDUCTION
;
1981 case TPC_ACTION_STAY
:
1989 * Do rate scaling and search for new modulation mode.
1991 static void rs_rate_scale_perform(struct iwl_mvm
*mvm
,
1992 struct sk_buff
*skb
,
1993 struct ieee80211_sta
*sta
,
1994 struct iwl_lq_sta
*lq_sta
)
1996 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1997 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1998 int low
= IWL_RATE_INVALID
;
1999 int high
= IWL_RATE_INVALID
;
2001 struct iwl_rate_scale_data
*window
= NULL
;
2002 int current_tpt
= IWL_INVALID_VALUE
;
2003 int low_tpt
= IWL_INVALID_VALUE
;
2004 int high_tpt
= IWL_INVALID_VALUE
;
2006 enum rs_action scale_action
= RS_ACTION_STAY
;
2009 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
2014 u8 tid
= IWL_MAX_TID_COUNT
;
2015 u8 prev_agg
= lq_sta
->is_agg
;
2016 struct iwl_mvm_sta
*sta_priv
= (void *)sta
->drv_priv
;
2017 struct iwl_mvm_tid_data
*tid_data
;
2018 struct rs_rate
*rate
;
2020 /* Send management frames and NO_ACK data using lowest rate. */
2021 /* TODO: this could probably be improved.. */
2022 if (!ieee80211_is_data(hdr
->frame_control
) ||
2023 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
2026 tid
= rs_get_tid(lq_sta
, hdr
);
2027 if ((tid
!= IWL_MAX_TID_COUNT
) &&
2028 (lq_sta
->tx_agg_tid_en
& (1 << tid
))) {
2029 tid_data
= &sta_priv
->tid_data
[tid
];
2030 if (tid_data
->state
== IWL_AGG_OFF
)
2039 * Select rate-scale / modulation-mode table to work with in
2040 * the rest of this function: "search" if searching for better
2041 * modulation mode, or "active" if doing rate scaling within a mode.
2043 if (!lq_sta
->search_better_tbl
)
2044 active_tbl
= lq_sta
->active_tbl
;
2046 active_tbl
= 1 - lq_sta
->active_tbl
;
2048 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2051 if (prev_agg
!= lq_sta
->is_agg
) {
2053 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2054 prev_agg
, lq_sta
->is_agg
);
2055 rs_set_expected_tpt_table(lq_sta
, tbl
);
2056 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
2059 /* current tx rate */
2060 index
= lq_sta
->last_txrate_idx
;
2062 /* rates available for this association, and for modulation mode */
2063 rate_mask
= rs_get_supported_rates(lq_sta
, rate
);
2065 if (!(BIT(index
) & rate_mask
)) {
2066 IWL_ERR(mvm
, "Current Rate is not valid\n");
2067 if (lq_sta
->search_better_tbl
) {
2068 /* revert to active table if search table is not valid*/
2069 rate
->type
= LQ_NONE
;
2070 lq_sta
->search_better_tbl
= 0;
2071 tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2072 rs_update_rate_tbl(mvm
, sta
, lq_sta
, &tbl
->rate
);
2077 /* Get expected throughput table and history window for current rate */
2078 if (!tbl
->expected_tpt
) {
2079 IWL_ERR(mvm
, "tbl->expected_tpt is NULL\n");
2083 /* force user max rate if set by user */
2084 if ((lq_sta
->max_rate_idx
!= -1) &&
2085 (lq_sta
->max_rate_idx
< index
)) {
2086 index
= lq_sta
->max_rate_idx
;
2088 window
= &(tbl
->win
[index
]);
2090 "Forcing user max rate %d\n",
2095 window
= &(tbl
->win
[index
]);
2098 * If there is not enough history to calculate actual average
2099 * throughput, keep analyzing results of more tx frames, without
2100 * changing rate or mode (bypass most of the rest of this function).
2101 * Set up new rate table in uCode only if old rate is not supported
2102 * in current association (use new rate found above).
2104 fail_count
= window
->counter
- window
->success_counter
;
2105 if ((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
2106 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
)) {
2108 "(%s: %d): Test Window: succ %d total %d\n",
2109 rs_pretty_lq_type(rate
->type
),
2110 index
, window
->success_counter
, window
->counter
);
2112 /* Can't calculate this yet; not enough history */
2113 window
->average_tpt
= IWL_INVALID_VALUE
;
2115 /* Should we stay with this modulation mode,
2116 * or search for a new one? */
2117 rs_stay_in_table(lq_sta
, false);
2121 /* Else we have enough samples; calculate estimate of
2122 * actual average throughput */
2123 if (window
->average_tpt
!= ((window
->success_ratio
*
2124 tbl
->expected_tpt
[index
] + 64) / 128)) {
2125 window
->average_tpt
= ((window
->success_ratio
*
2126 tbl
->expected_tpt
[index
] + 64) / 128);
2129 /* If we are searching for better modulation mode, check success. */
2130 if (lq_sta
->search_better_tbl
) {
2131 /* If good success, continue using the "search" mode;
2132 * no need to send new link quality command, since we're
2133 * continuing to use the setup that we've been trying. */
2134 if (window
->average_tpt
> lq_sta
->last_tpt
) {
2136 "SWITCHING TO NEW TABLE SR: %d "
2137 "cur-tpt %d old-tpt %d\n",
2138 window
->success_ratio
,
2139 window
->average_tpt
,
2142 /* Swap tables; "search" becomes "active" */
2143 lq_sta
->active_tbl
= active_tbl
;
2144 current_tpt
= window
->average_tpt
;
2145 /* Else poor success; go back to mode in "active" table */
2148 "GOING BACK TO THE OLD TABLE: SR %d "
2149 "cur-tpt %d old-tpt %d\n",
2150 window
->success_ratio
,
2151 window
->average_tpt
,
2154 /* Nullify "search" table */
2155 rate
->type
= LQ_NONE
;
2157 /* Revert to "active" table */
2158 active_tbl
= lq_sta
->active_tbl
;
2159 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2161 /* Revert to "active" rate and throughput info */
2162 index
= tbl
->rate
.index
;
2163 current_tpt
= lq_sta
->last_tpt
;
2165 /* Need to set up a new rate table in uCode */
2169 /* Either way, we've made a decision; modulation mode
2170 * search is done, allow rate adjustment next time. */
2171 lq_sta
->search_better_tbl
= 0;
2172 done_search
= 1; /* Don't switch modes below! */
2176 /* (Else) not in search of better modulation mode, try for better
2177 * starting rate, while staying in this mode. */
2178 high_low
= rs_get_adjacent_rate(mvm
, index
, rate_mask
, rate
->type
);
2179 low
= high_low
& 0xff;
2180 high
= (high_low
>> 8) & 0xff;
2182 /* If user set max rate, dont allow higher than user constrain */
2183 if ((lq_sta
->max_rate_idx
!= -1) &&
2184 (lq_sta
->max_rate_idx
< high
))
2185 high
= IWL_RATE_INVALID
;
2187 sr
= window
->success_ratio
;
2189 /* Collect measured throughputs for current and adjacent rates */
2190 current_tpt
= window
->average_tpt
;
2191 if (low
!= IWL_RATE_INVALID
)
2192 low_tpt
= tbl
->win
[low
].average_tpt
;
2193 if (high
!= IWL_RATE_INVALID
)
2194 high_tpt
= tbl
->win
[high
].average_tpt
;
2197 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2198 rs_pretty_lq_type(rate
->type
), index
, current_tpt
, sr
,
2199 low
, high
, low_tpt
, high_tpt
);
2201 scale_action
= rs_get_rate_action(mvm
, tbl
, sr
, low
, high
,
2202 current_tpt
, low_tpt
, high_tpt
);
2204 /* Force a search in case BT doesn't like us being in MIMO */
2205 if (is_mimo(rate
) &&
2206 !iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
)) {
2208 "BT Coex forbids MIMO. Search for new config\n");
2209 rs_stay_in_table(lq_sta
, true);
2213 switch (scale_action
) {
2214 case RS_ACTION_DOWNSCALE
:
2215 /* Decrease starting rate, update uCode's rate table */
2216 if (low
!= IWL_RATE_INVALID
) {
2221 "At the bottom rate. Can't decrease\n");
2225 case RS_ACTION_UPSCALE
:
2226 /* Increase starting rate, update uCode's rate table */
2227 if (high
!= IWL_RATE_INVALID
) {
2232 "At the top rate. Can't increase\n");
2236 case RS_ACTION_STAY
:
2238 update_lq
= rs_tpc_perform(mvm
, sta
, lq_sta
, tbl
);
2245 /* Replace uCode's rate table for the destination station. */
2247 tbl
->rate
.index
= index
;
2248 rs_update_rate_tbl(mvm
, sta
, lq_sta
, &tbl
->rate
);
2251 rs_stay_in_table(lq_sta
, false);
2254 * Search for new modulation mode if we're:
2255 * 1) Not changing rates right now
2256 * 2) Not just finishing up a search
2257 * 3) Allowing a new search
2259 if (!update_lq
&& !done_search
&&
2260 lq_sta
->rs_state
== RS_STATE_SEARCH_CYCLE_STARTED
2261 && window
->counter
) {
2262 enum rs_column next_column
;
2264 /* Save current throughput to compare with "search" throughput*/
2265 lq_sta
->last_tpt
= current_tpt
;
2268 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2269 update_lq
, done_search
, lq_sta
->rs_state
,
2272 next_column
= rs_get_next_column(mvm
, lq_sta
, sta
, tbl
);
2273 if (next_column
!= RS_COLUMN_INVALID
) {
2274 int ret
= rs_switch_to_column(mvm
, lq_sta
, sta
,
2277 lq_sta
->search_better_tbl
= 1;
2280 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2281 lq_sta
->rs_state
= RS_STATE_SEARCH_CYCLE_ENDED
;
2284 /* If new "search" mode was selected, set up in uCode table */
2285 if (lq_sta
->search_better_tbl
) {
2286 /* Access the "search" table, clear its history. */
2287 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2288 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
2290 /* Use new "search" start rate */
2291 index
= tbl
->rate
.index
;
2293 rs_dump_rate(mvm
, &tbl
->rate
,
2294 "Switch to SEARCH TABLE:");
2295 rs_fill_lq_cmd(mvm
, sta
, lq_sta
, &tbl
->rate
);
2296 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, false);
2302 if (done_search
&& lq_sta
->rs_state
== RS_STATE_SEARCH_CYCLE_ENDED
) {
2303 /* If the "active" (non-search) mode was legacy,
2304 * and we've tried switching antennas,
2305 * but we haven't been able to try HT modes (not available),
2306 * stay with best antenna legacy modulation for a while
2307 * before next round of mode comparisons. */
2308 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2309 if (is_legacy(&tbl1
->rate
)) {
2310 IWL_DEBUG_RATE(mvm
, "LQ: STAY in legacy table\n");
2312 if (tid
!= IWL_MAX_TID_COUNT
) {
2313 tid_data
= &sta_priv
->tid_data
[tid
];
2314 if (tid_data
->state
!= IWL_AGG_OFF
) {
2316 "Stop aggregation on tid %d\n",
2318 ieee80211_stop_tx_ba_session(sta
, tid
);
2321 rs_set_stay_in_table(mvm
, 1, lq_sta
);
2323 /* If we're in an HT mode, and all 3 mode switch actions
2324 * have been tried and compared, stay in this best modulation
2325 * mode for a while before next round of mode comparisons. */
2326 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2327 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2328 (tid
!= IWL_MAX_TID_COUNT
)) {
2329 tid_data
= &sta_priv
->tid_data
[tid
];
2330 if (tid_data
->state
== IWL_AGG_OFF
) {
2332 "try to aggregate tid %d\n",
2334 rs_tl_turn_on_agg(mvm
, tid
,
2338 rs_set_stay_in_table(mvm
, 0, lq_sta
);
2343 lq_sta
->last_txrate_idx
= index
;
2347 * rs_initialize_lq - Initialize a station's hardware rate table
2349 * The uCode's station table contains a table of fallback rates
2350 * for automatic fallback during transmission.
2352 * NOTE: This sets up a default set of values. These will be replaced later
2353 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2356 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2357 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2358 * which requires station table entry to exist).
2360 static void rs_initialize_lq(struct iwl_mvm
*mvm
,
2361 struct ieee80211_sta
*sta
,
2362 struct iwl_lq_sta
*lq_sta
,
2363 enum ieee80211_band band
,
2366 struct iwl_scale_tbl_info
*tbl
;
2367 struct rs_rate
*rate
;
2372 if (!sta
|| !lq_sta
)
2375 i
= lq_sta
->last_txrate_idx
;
2377 valid_tx_ant
= mvm
->fw
->valid_tx_ant
;
2379 if (!lq_sta
->search_better_tbl
)
2380 active_tbl
= lq_sta
->active_tbl
;
2382 active_tbl
= 1 - lq_sta
->active_tbl
;
2384 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2387 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2391 rate
->ant
= first_antenna(valid_tx_ant
);
2393 rate
->bw
= RATE_MCS_CHAN_WIDTH_20
;
2394 if (band
== IEEE80211_BAND_5GHZ
)
2395 rate
->type
= LQ_LEGACY_A
;
2397 rate
->type
= LQ_LEGACY_G
;
2399 WARN_ON_ONCE(rate
->ant
!= ANT_A
&& rate
->ant
!= ANT_B
);
2400 if (rate
->ant
== ANT_A
)
2401 tbl
->column
= RS_COLUMN_LEGACY_ANT_A
;
2403 tbl
->column
= RS_COLUMN_LEGACY_ANT_B
;
2405 rs_set_expected_tpt_table(lq_sta
, tbl
);
2406 rs_fill_lq_cmd(mvm
, sta
, lq_sta
, rate
);
2407 /* TODO restore station should remember the lq cmd */
2408 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, init
);
2411 static void rs_get_rate(void *mvm_r
, struct ieee80211_sta
*sta
, void *mvm_sta
,
2412 struct ieee80211_tx_rate_control
*txrc
)
2414 struct sk_buff
*skb
= txrc
->skb
;
2415 struct ieee80211_supported_band
*sband
= txrc
->sband
;
2416 struct iwl_op_mode
*op_mode __maybe_unused
=
2417 (struct iwl_op_mode
*)mvm_r
;
2418 struct iwl_mvm
*mvm __maybe_unused
= IWL_OP_MODE_GET_MVM(op_mode
);
2419 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2420 struct iwl_lq_sta
*lq_sta
= mvm_sta
;
2422 /* Get max rate if user set max rate */
2424 lq_sta
->max_rate_idx
= txrc
->max_rate_idx
;
2425 if ((sband
->band
== IEEE80211_BAND_5GHZ
) &&
2426 (lq_sta
->max_rate_idx
!= -1))
2427 lq_sta
->max_rate_idx
+= IWL_FIRST_OFDM_RATE
;
2428 if ((lq_sta
->max_rate_idx
< 0) ||
2429 (lq_sta
->max_rate_idx
>= IWL_RATE_COUNT
))
2430 lq_sta
->max_rate_idx
= -1;
2433 /* Treat uninitialized rate scaling data same as non-existing. */
2434 if (lq_sta
&& !lq_sta
->drv
) {
2435 IWL_DEBUG_RATE(mvm
, "Rate scaling not initialized yet.\n");
2439 /* Send management frames and NO_ACK data using lowest rate. */
2440 if (rate_control_send_low(sta
, mvm_sta
, txrc
))
2443 iwl_mvm_hwrate_to_tx_rate(lq_sta
->last_rate_n_flags
,
2444 info
->band
, &info
->control
.rates
[0]);
2446 info
->control
.rates
[0].count
= 1;
2449 static void *rs_alloc_sta(void *mvm_rate
, struct ieee80211_sta
*sta
,
2452 struct iwl_mvm_sta
*sta_priv
= (struct iwl_mvm_sta
*)sta
->drv_priv
;
2453 struct iwl_op_mode
*op_mode __maybe_unused
=
2454 (struct iwl_op_mode
*)mvm_rate
;
2455 struct iwl_mvm
*mvm __maybe_unused
= IWL_OP_MODE_GET_MVM(op_mode
);
2457 IWL_DEBUG_RATE(mvm
, "create station rate scale window\n");
2459 return &sta_priv
->lq_sta
;
2462 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap
*vht_cap
,
2465 u16 rx_mcs
= le16_to_cpu(vht_cap
->vht_mcs
.rx_mcs_map
) &
2466 (0x3 << (2 * (nss
- 1)));
2467 rx_mcs
>>= (2 * (nss
- 1));
2469 if (rx_mcs
== IEEE80211_VHT_MCS_SUPPORT_0_7
)
2470 return IWL_RATE_MCS_7_INDEX
;
2471 else if (rx_mcs
== IEEE80211_VHT_MCS_SUPPORT_0_8
)
2472 return IWL_RATE_MCS_8_INDEX
;
2473 else if (rx_mcs
== IEEE80211_VHT_MCS_SUPPORT_0_9
)
2474 return IWL_RATE_MCS_9_INDEX
;
2476 WARN_ON_ONCE(rx_mcs
!= IEEE80211_VHT_MCS_NOT_SUPPORTED
);
2480 static void rs_vht_set_enabled_rates(struct ieee80211_sta
*sta
,
2481 struct ieee80211_sta_vht_cap
*vht_cap
,
2482 struct iwl_lq_sta
*lq_sta
)
2485 int highest_mcs
= rs_vht_highest_rx_mcs_index(vht_cap
, 1);
2487 if (highest_mcs
>= IWL_RATE_MCS_0_INDEX
) {
2488 for (i
= IWL_RATE_MCS_0_INDEX
; i
<= highest_mcs
; i
++) {
2489 if (i
== IWL_RATE_9M_INDEX
)
2492 /* Disable MCS9 as a workaround */
2493 if (i
== IWL_RATE_MCS_9_INDEX
)
2496 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2497 if (i
== IWL_RATE_MCS_9_INDEX
&&
2498 sta
->bandwidth
== IEEE80211_STA_RX_BW_20
)
2501 lq_sta
->active_siso_rate
|= BIT(i
);
2505 if (sta
->rx_nss
< 2)
2508 highest_mcs
= rs_vht_highest_rx_mcs_index(vht_cap
, 2);
2509 if (highest_mcs
>= IWL_RATE_MCS_0_INDEX
) {
2510 for (i
= IWL_RATE_MCS_0_INDEX
; i
<= highest_mcs
; i
++) {
2511 if (i
== IWL_RATE_9M_INDEX
)
2514 /* Disable MCS9 as a workaround */
2515 if (i
== IWL_RATE_MCS_9_INDEX
)
2518 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2519 if (i
== IWL_RATE_MCS_9_INDEX
&&
2520 sta
->bandwidth
== IEEE80211_STA_RX_BW_20
)
2523 lq_sta
->active_mimo2_rate
|= BIT(i
);
2528 #ifdef CONFIG_IWLWIFI_DEBUGFS
2529 static void iwl_mvm_reset_frame_stats(struct iwl_mvm
*mvm
,
2530 struct iwl_mvm_frame_stats
*stats
)
2532 spin_lock_bh(&mvm
->drv_stats_lock
);
2533 memset(stats
, 0, sizeof(*stats
));
2534 spin_unlock_bh(&mvm
->drv_stats_lock
);
2537 void iwl_mvm_update_frame_stats(struct iwl_mvm
*mvm
,
2538 struct iwl_mvm_frame_stats
*stats
,
2541 u8 nss
= 0, mcs
= 0;
2543 spin_lock(&mvm
->drv_stats_lock
);
2546 stats
->agg_frames
++;
2548 stats
->success_frames
++;
2550 switch (rate
& RATE_MCS_CHAN_WIDTH_MSK
) {
2551 case RATE_MCS_CHAN_WIDTH_20
:
2552 stats
->bw_20_frames
++;
2554 case RATE_MCS_CHAN_WIDTH_40
:
2555 stats
->bw_40_frames
++;
2557 case RATE_MCS_CHAN_WIDTH_80
:
2558 stats
->bw_80_frames
++;
2561 WARN_ONCE(1, "bad BW. rate 0x%x", rate
);
2564 if (rate
& RATE_MCS_HT_MSK
) {
2566 mcs
= rate
& RATE_HT_MCS_RATE_CODE_MSK
;
2567 nss
= ((rate
& RATE_HT_MCS_NSS_MSK
) >> RATE_HT_MCS_NSS_POS
) + 1;
2568 } else if (rate
& RATE_MCS_VHT_MSK
) {
2569 stats
->vht_frames
++;
2570 mcs
= rate
& RATE_VHT_MCS_RATE_CODE_MSK
;
2571 nss
= ((rate
& RATE_VHT_MCS_NSS_MSK
) >>
2572 RATE_VHT_MCS_NSS_POS
) + 1;
2574 stats
->legacy_frames
++;
2578 stats
->siso_frames
++;
2580 stats
->mimo2_frames
++;
2582 if (rate
& RATE_MCS_SGI_MSK
)
2583 stats
->sgi_frames
++;
2585 stats
->ngi_frames
++;
2587 stats
->last_rates
[stats
->last_frame_idx
] = rate
;
2588 stats
->last_frame_idx
= (stats
->last_frame_idx
+ 1) %
2589 ARRAY_SIZE(stats
->last_rates
);
2591 spin_unlock(&mvm
->drv_stats_lock
);
2596 * Called after adding a new station to initialize rate scaling
2598 void iwl_mvm_rs_rate_init(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
2599 enum ieee80211_band band
, bool init
)
2602 struct ieee80211_hw
*hw
= mvm
->hw
;
2603 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
2604 struct ieee80211_sta_vht_cap
*vht_cap
= &sta
->vht_cap
;
2605 struct iwl_mvm_sta
*sta_priv
;
2606 struct iwl_lq_sta
*lq_sta
;
2607 struct ieee80211_supported_band
*sband
;
2608 unsigned long supp
; /* must be unsigned long for for_each_set_bit */
2610 sta_priv
= (struct iwl_mvm_sta
*)sta
->drv_priv
;
2611 lq_sta
= &sta_priv
->lq_sta
;
2612 memset(lq_sta
, 0, sizeof(*lq_sta
));
2614 sband
= hw
->wiphy
->bands
[band
];
2616 lq_sta
->lq
.sta_id
= sta_priv
->sta_id
;
2618 for (j
= 0; j
< LQ_SIZE
; j
++)
2619 rs_rate_scale_clear_tbl_windows(mvm
, &lq_sta
->lq_info
[j
]);
2621 lq_sta
->flush_timer
= 0;
2622 lq_sta
->last_tx
= jiffies
;
2625 "LQ: *** rate scale station global init for station %d ***\n",
2627 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2628 * the lowest or the highest rate.. Could consider using RSSI from
2629 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2632 lq_sta
->max_rate_idx
= -1;
2633 lq_sta
->missed_rate_counter
= IWL_MISSED_RATE_MAX
;
2634 lq_sta
->band
= sband
->band
;
2636 * active legacy rates as per supported rates bitmap
2638 supp
= sta
->supp_rates
[sband
->band
];
2639 lq_sta
->active_legacy_rate
= 0;
2640 for_each_set_bit(i
, &supp
, BITS_PER_LONG
)
2641 lq_sta
->active_legacy_rate
|= BIT(sband
->bitrates
[i
].hw_value
);
2643 /* TODO: should probably account for rx_highest for both HT/VHT */
2644 if (!vht_cap
|| !vht_cap
->vht_supported
) {
2645 /* active_siso_rate mask includes 9 MBits (bit 5),
2646 * and CCK (bits 0-3), supp_rates[] does not;
2647 * shift to convert format, force 9 MBits off.
2649 lq_sta
->active_siso_rate
= ht_cap
->mcs
.rx_mask
[0] << 1;
2650 lq_sta
->active_siso_rate
|= ht_cap
->mcs
.rx_mask
[0] & 0x1;
2651 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2652 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2655 lq_sta
->active_mimo2_rate
= ht_cap
->mcs
.rx_mask
[1] << 1;
2656 lq_sta
->active_mimo2_rate
|= ht_cap
->mcs
.rx_mask
[1] & 0x1;
2657 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2658 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2660 lq_sta
->is_vht
= false;
2662 rs_vht_set_enabled_rates(sta
, vht_cap
, lq_sta
);
2663 lq_sta
->is_vht
= true;
2666 lq_sta
->max_legacy_rate_idx
= find_last_bit(&lq_sta
->active_legacy_rate
,
2668 lq_sta
->max_siso_rate_idx
= find_last_bit(&lq_sta
->active_siso_rate
,
2670 lq_sta
->max_mimo2_rate_idx
= find_last_bit(&lq_sta
->active_mimo2_rate
,
2673 IWL_DEBUG_RATE(mvm
, "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d\n",
2674 lq_sta
->active_legacy_rate
,
2675 lq_sta
->active_siso_rate
,
2676 lq_sta
->active_mimo2_rate
,
2678 IWL_DEBUG_RATE(mvm
, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2679 lq_sta
->max_legacy_rate_idx
,
2680 lq_sta
->max_siso_rate_idx
,
2681 lq_sta
->max_mimo2_rate_idx
);
2683 /* These values will be overridden later */
2684 lq_sta
->lq
.single_stream_ant_msk
=
2685 first_antenna(mvm
->fw
->valid_tx_ant
);
2686 lq_sta
->lq
.dual_stream_ant_msk
= ANT_AB
;
2688 /* as default allow aggregation for all tids */
2689 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2692 /* Set last_txrate_idx to lowest rate */
2693 lq_sta
->last_txrate_idx
= rate_lowest_index(sband
, sta
);
2694 if (sband
->band
== IEEE80211_BAND_5GHZ
)
2695 lq_sta
->last_txrate_idx
+= IWL_FIRST_OFDM_RATE
;
2697 #ifdef CONFIG_MAC80211_DEBUGFS
2698 lq_sta
->dbg_fixed_rate
= 0;
2699 lq_sta
->dbg_fixed_txp_reduction
= TPC_INVALID
;
2701 #ifdef CONFIG_IWLWIFI_DEBUGFS
2702 iwl_mvm_reset_frame_stats(mvm
, &mvm
->drv_rx_stats
);
2704 rs_initialize_lq(mvm
, sta
, lq_sta
, band
, init
);
2707 static void rs_rate_update(void *mvm_r
,
2708 struct ieee80211_supported_band
*sband
,
2709 struct cfg80211_chan_def
*chandef
,
2710 struct ieee80211_sta
*sta
, void *priv_sta
,
2714 struct iwl_op_mode
*op_mode
=
2715 (struct iwl_op_mode
*)mvm_r
;
2716 struct iwl_mvm
*mvm
= IWL_OP_MODE_GET_MVM(op_mode
);
2718 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2719 for (tid
= 0; tid
< IWL_MAX_TID_COUNT
; tid
++)
2720 ieee80211_stop_tx_ba_session(sta
, tid
);
2722 iwl_mvm_rs_rate_init(mvm
, sta
, sband
->band
, false);
2725 #ifdef CONFIG_MAC80211_DEBUGFS
2726 static void rs_build_rates_table_from_fixed(struct iwl_mvm
*mvm
,
2727 struct iwl_lq_cmd
*lq_cmd
,
2728 enum ieee80211_band band
,
2731 struct rs_rate rate
;
2733 int num_rates
= ARRAY_SIZE(lq_cmd
->rs_table
);
2734 __le32 ucode_rate_le32
= cpu_to_le32(ucode_rate
);
2736 for (i
= 0; i
< num_rates
; i
++)
2737 lq_cmd
->rs_table
[i
] = ucode_rate_le32
;
2739 rs_rate_from_ucode_rate(ucode_rate
, band
, &rate
);
2742 lq_cmd
->mimo_delim
= num_rates
- 1;
2744 lq_cmd
->mimo_delim
= 0;
2746 #endif /* CONFIG_MAC80211_DEBUGFS */
2748 static void rs_fill_rates_for_column(struct iwl_mvm
*mvm
,
2749 struct iwl_lq_sta
*lq_sta
,
2750 struct rs_rate
*rate
,
2751 __le32
*rs_table
, int *rs_table_index
,
2752 int num_rates
, int num_retries
,
2753 u8 valid_tx_ant
, bool toggle_ant
)
2757 bool bottom_reached
= false;
2758 int prev_rate_idx
= rate
->index
;
2759 int end
= LINK_QUAL_MAX_RETRY_NUM
;
2760 int index
= *rs_table_index
;
2762 for (i
= 0; i
< num_rates
&& index
< end
; i
++) {
2763 ucode_rate
= cpu_to_le32(ucode_rate_from_rs_rate(mvm
, rate
));
2764 for (j
= 0; j
< num_retries
&& index
< end
; j
++, index
++)
2765 rs_table
[index
] = ucode_rate
;
2768 rs_toggle_antenna(valid_tx_ant
, rate
);
2770 prev_rate_idx
= rate
->index
;
2771 bottom_reached
= rs_get_lower_rate_in_column(lq_sta
, rate
);
2772 if (bottom_reached
&& !is_legacy(rate
))
2776 if (!bottom_reached
)
2777 rate
->index
= prev_rate_idx
;
2779 *rs_table_index
= index
;
2782 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2783 * column the rate table should look like this:
2785 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2786 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2787 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2788 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2789 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2790 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2791 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2792 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2793 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2794 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2795 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2796 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2797 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2798 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2799 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2800 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2802 static void rs_build_rates_table(struct iwl_mvm
*mvm
,
2803 struct iwl_lq_sta
*lq_sta
,
2804 const struct rs_rate
*initial_rate
)
2806 struct rs_rate rate
;
2807 int num_rates
, num_retries
, index
= 0;
2808 u8 valid_tx_ant
= 0;
2809 struct iwl_lq_cmd
*lq_cmd
= &lq_sta
->lq
;
2810 bool toggle_ant
= false;
2812 memcpy(&rate
, initial_rate
, sizeof(rate
));
2814 valid_tx_ant
= mvm
->fw
->valid_tx_ant
;
2816 if (is_siso(&rate
)) {
2817 num_rates
= RS_INITIAL_SISO_NUM_RATES
;
2818 num_retries
= RS_HT_VHT_RETRIES_PER_RATE
;
2819 } else if (is_mimo(&rate
)) {
2820 num_rates
= RS_INITIAL_MIMO_NUM_RATES
;
2821 num_retries
= RS_HT_VHT_RETRIES_PER_RATE
;
2823 num_rates
= RS_INITIAL_LEGACY_NUM_RATES
;
2824 num_retries
= RS_LEGACY_RETRIES_PER_RATE
;
2828 rs_fill_rates_for_column(mvm
, lq_sta
, &rate
, lq_cmd
->rs_table
, &index
,
2829 num_rates
, num_retries
, valid_tx_ant
,
2832 rs_get_lower_rate_down_column(lq_sta
, &rate
);
2834 if (is_siso(&rate
)) {
2835 num_rates
= RS_SECONDARY_SISO_NUM_RATES
;
2836 num_retries
= RS_SECONDARY_SISO_RETRIES
;
2837 lq_cmd
->mimo_delim
= index
;
2838 } else if (is_legacy(&rate
)) {
2839 num_rates
= RS_SECONDARY_LEGACY_NUM_RATES
;
2840 num_retries
= RS_LEGACY_RETRIES_PER_RATE
;
2847 rs_fill_rates_for_column(mvm
, lq_sta
, &rate
, lq_cmd
->rs_table
, &index
,
2848 num_rates
, num_retries
, valid_tx_ant
,
2851 rs_get_lower_rate_down_column(lq_sta
, &rate
);
2853 num_rates
= RS_SECONDARY_LEGACY_NUM_RATES
;
2854 num_retries
= RS_LEGACY_RETRIES_PER_RATE
;
2856 rs_fill_rates_for_column(mvm
, lq_sta
, &rate
, lq_cmd
->rs_table
, &index
,
2857 num_rates
, num_retries
, valid_tx_ant
,
2862 static void rs_fill_lq_cmd(struct iwl_mvm
*mvm
,
2863 struct ieee80211_sta
*sta
,
2864 struct iwl_lq_sta
*lq_sta
,
2865 const struct rs_rate
*initial_rate
)
2867 struct iwl_lq_cmd
*lq_cmd
= &lq_sta
->lq
;
2868 u8 ant
= initial_rate
->ant
;
2870 #ifdef CONFIG_MAC80211_DEBUGFS
2871 if (lq_sta
->dbg_fixed_rate
) {
2872 rs_build_rates_table_from_fixed(mvm
, lq_cmd
,
2874 lq_sta
->dbg_fixed_rate
);
2875 lq_cmd
->reduced_tpc
= 0;
2876 ant
= (lq_sta
->dbg_fixed_rate
& RATE_MCS_ANT_ABC_MSK
) >>
2880 rs_build_rates_table(mvm
, lq_sta
, initial_rate
);
2882 if (num_of_ant(ant
) == 1)
2883 lq_cmd
->single_stream_ant_msk
= ant
;
2885 lq_cmd
->agg_frame_cnt_limit
= LINK_QUAL_AGG_FRAME_LIMIT_DEF
;
2886 lq_cmd
->agg_disable_start_th
= LINK_QUAL_AGG_DISABLE_START_DEF
;
2888 lq_cmd
->agg_time_limit
=
2889 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF
);
2892 lq_cmd
->agg_time_limit
=
2893 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm
, sta
));
2896 static void *rs_alloc(struct ieee80211_hw
*hw
, struct dentry
*debugfsdir
)
2900 /* rate scale requires free function to be implemented */
2901 static void rs_free(void *mvm_rate
)
2906 static void rs_free_sta(void *mvm_r
, struct ieee80211_sta
*sta
,
2909 struct iwl_op_mode
*op_mode __maybe_unused
= mvm_r
;
2910 struct iwl_mvm
*mvm __maybe_unused
= IWL_OP_MODE_GET_MVM(op_mode
);
2912 IWL_DEBUG_RATE(mvm
, "enter\n");
2913 IWL_DEBUG_RATE(mvm
, "leave\n");
2916 #ifdef CONFIG_MAC80211_DEBUGFS
2917 int rs_pretty_print_rate(char *buf
, const u32 rate
)
2921 u8 mcs
= 0, nss
= 0;
2922 u8 ant
= (rate
& RATE_MCS_ANT_ABC_MSK
) >> RATE_MCS_ANT_POS
;
2924 if (!(rate
& RATE_MCS_HT_MSK
) &&
2925 !(rate
& RATE_MCS_VHT_MSK
)) {
2926 int index
= iwl_hwrate_to_plcp_idx(rate
);
2928 return sprintf(buf
, "Legacy | ANT: %s Rate: %s Mbps\n",
2930 index
== IWL_RATE_INVALID
? "BAD" :
2931 iwl_rate_mcs
[index
].mbps
);
2934 if (rate
& RATE_MCS_VHT_MSK
) {
2936 mcs
= rate
& RATE_VHT_MCS_RATE_CODE_MSK
;
2937 nss
= ((rate
& RATE_VHT_MCS_NSS_MSK
)
2938 >> RATE_VHT_MCS_NSS_POS
) + 1;
2939 } else if (rate
& RATE_MCS_HT_MSK
) {
2941 mcs
= rate
& RATE_HT_MCS_INDEX_MSK
;
2943 type
= "Unknown"; /* shouldn't happen */
2946 switch (rate
& RATE_MCS_CHAN_WIDTH_MSK
) {
2947 case RATE_MCS_CHAN_WIDTH_20
:
2950 case RATE_MCS_CHAN_WIDTH_40
:
2953 case RATE_MCS_CHAN_WIDTH_80
:
2956 case RATE_MCS_CHAN_WIDTH_160
:
2963 return sprintf(buf
, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2964 type
, rs_pretty_ant(ant
), bw
, mcs
, nss
,
2965 (rate
& RATE_MCS_SGI_MSK
) ? "SGI " : "NGI ",
2966 (rate
& RATE_MCS_HT_STBC_MSK
) ? "STBC " : "",
2967 (rate
& RATE_MCS_LDPC_MSK
) ? "LDPC " : "",
2968 (rate
& RATE_MCS_BF_MSK
) ? "BF " : "",
2969 (rate
& RATE_MCS_ZLF_MSK
) ? "ZLF " : "");
2973 * Program the device to use fixed rate for frame transmit
2974 * This is for debugging/testing only
2975 * once the device start use fixed rate, we need to reload the module
2976 * to being back the normal operation.
2978 static void rs_program_fix_rate(struct iwl_mvm
*mvm
,
2979 struct iwl_lq_sta
*lq_sta
)
2981 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2982 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2983 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2985 IWL_DEBUG_RATE(mvm
, "sta_id %d rate 0x%X\n",
2986 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed_rate
);
2988 if (lq_sta
->dbg_fixed_rate
) {
2989 struct rs_rate rate
;
2990 rs_rate_from_ucode_rate(lq_sta
->dbg_fixed_rate
,
2991 lq_sta
->band
, &rate
);
2992 rs_fill_lq_cmd(mvm
, NULL
, lq_sta
, &rate
);
2993 iwl_mvm_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, false);
2997 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2998 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3000 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3001 struct iwl_mvm
*mvm
;
3007 memset(buf
, 0, sizeof(buf
));
3008 buf_size
= min(count
, sizeof(buf
) - 1);
3009 if (copy_from_user(buf
, user_buf
, buf_size
))
3012 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
3013 lq_sta
->dbg_fixed_rate
= parsed_rate
;
3015 lq_sta
->dbg_fixed_rate
= 0;
3017 rs_program_fix_rate(mvm
, lq_sta
);
3022 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
3023 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3030 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3031 struct iwl_mvm
*mvm
;
3032 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
3033 struct rs_rate
*rate
= &tbl
->rate
;
3035 buff
= kmalloc(2048, GFP_KERNEL
);
3039 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
3040 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%lX\n",
3041 lq_sta
->total_failed
, lq_sta
->total_success
,
3042 lq_sta
->active_legacy_rate
);
3043 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
3044 lq_sta
->dbg_fixed_rate
);
3045 desc
+= sprintf(buff
+desc
, "valid_tx_ant %s%s%s\n",
3046 (mvm
->fw
->valid_tx_ant
& ANT_A
) ? "ANT_A," : "",
3047 (mvm
->fw
->valid_tx_ant
& ANT_B
) ? "ANT_B," : "",
3048 (mvm
->fw
->valid_tx_ant
& ANT_C
) ? "ANT_C" : "");
3049 desc
+= sprintf(buff
+desc
, "lq type %s\n",
3050 (is_legacy(rate
)) ? "legacy" :
3051 is_vht(rate
) ? "VHT" : "HT");
3052 if (!is_legacy(rate
)) {
3053 desc
+= sprintf(buff
+desc
, " %s",
3054 (is_siso(rate
)) ? "SISO" : "MIMO2");
3055 desc
+= sprintf(buff
+desc
, " %s",
3056 (is_ht20(rate
)) ? "20MHz" :
3057 (is_ht40(rate
)) ? "40MHz" :
3058 (is_ht80(rate
)) ? "80Mhz" : "BAD BW");
3059 desc
+= sprintf(buff
+desc
, " %s %s\n",
3060 (rate
->sgi
) ? "SGI" : "NGI",
3061 (lq_sta
->is_agg
) ? "AGG on" : "");
3063 desc
+= sprintf(buff
+desc
, "last tx rate=0x%X\n",
3064 lq_sta
->last_rate_n_flags
);
3065 desc
+= sprintf(buff
+desc
,
3066 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3068 lq_sta
->lq
.mimo_delim
,
3069 lq_sta
->lq
.single_stream_ant_msk
,
3070 lq_sta
->lq
.dual_stream_ant_msk
);
3072 desc
+= sprintf(buff
+desc
,
3073 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3074 le16_to_cpu(lq_sta
->lq
.agg_time_limit
),
3075 lq_sta
->lq
.agg_disable_start_th
,
3076 lq_sta
->lq
.agg_frame_cnt_limit
);
3078 desc
+= sprintf(buff
+desc
, "reduced tpc=%d\n", lq_sta
->lq
.reduced_tpc
);
3079 desc
+= sprintf(buff
+desc
,
3080 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3081 lq_sta
->lq
.initial_rate_index
[0],
3082 lq_sta
->lq
.initial_rate_index
[1],
3083 lq_sta
->lq
.initial_rate_index
[2],
3084 lq_sta
->lq
.initial_rate_index
[3]);
3086 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++) {
3087 u32 r
= le32_to_cpu(lq_sta
->lq
.rs_table
[i
]);
3089 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X ", i
, r
);
3090 desc
+= rs_pretty_print_rate(buff
+desc
, r
);
3093 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3098 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
3099 .write
= rs_sta_dbgfs_scale_table_write
,
3100 .read
= rs_sta_dbgfs_scale_table_read
,
3101 .open
= simple_open
,
3102 .llseek
= default_llseek
,
3104 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
3105 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3111 struct iwl_scale_tbl_info
*tbl
;
3112 struct rs_rate
*rate
;
3113 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3115 buff
= kmalloc(1024, GFP_KERNEL
);
3119 for (i
= 0; i
< LQ_SIZE
; i
++) {
3120 tbl
= &(lq_sta
->lq_info
[i
]);
3122 desc
+= sprintf(buff
+desc
,
3123 "%s type=%d SGI=%d BW=%s DUP=0\n"
3125 lq_sta
->active_tbl
== i
? "*" : "x",
3128 is_ht20(rate
) ? "20Mhz" :
3129 is_ht40(rate
) ? "40Mhz" :
3130 is_ht80(rate
) ? "80Mhz" : "ERR",
3132 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
3133 desc
+= sprintf(buff
+desc
,
3134 "counter=%d success=%d %%=%d\n",
3135 tbl
->win
[j
].counter
,
3136 tbl
->win
[j
].success_counter
,
3137 tbl
->win
[j
].success_ratio
);
3140 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3145 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
3146 .read
= rs_sta_dbgfs_stats_table_read
,
3147 .open
= simple_open
,
3148 .llseek
= default_llseek
,
3151 static ssize_t
rs_sta_dbgfs_drv_tx_stats_read(struct file
*file
,
3152 char __user
*user_buf
,
3153 size_t count
, loff_t
*ppos
)
3155 static const char * const column_name
[] = {
3156 [RS_COLUMN_LEGACY_ANT_A
] = "LEGACY_ANT_A",
3157 [RS_COLUMN_LEGACY_ANT_B
] = "LEGACY_ANT_B",
3158 [RS_COLUMN_SISO_ANT_A
] = "SISO_ANT_A",
3159 [RS_COLUMN_SISO_ANT_B
] = "SISO_ANT_B",
3160 [RS_COLUMN_SISO_ANT_A_SGI
] = "SISO_ANT_A_SGI",
3161 [RS_COLUMN_SISO_ANT_B_SGI
] = "SISO_ANT_B_SGI",
3162 [RS_COLUMN_MIMO2
] = "MIMO2",
3163 [RS_COLUMN_MIMO2_SGI
] = "MIMO2_SGI",
3166 static const char * const rate_name
[] = {
3167 [IWL_RATE_1M_INDEX
] = "1M",
3168 [IWL_RATE_2M_INDEX
] = "2M",
3169 [IWL_RATE_5M_INDEX
] = "5.5M",
3170 [IWL_RATE_11M_INDEX
] = "11M",
3171 [IWL_RATE_6M_INDEX
] = "6M|MCS0",
3172 [IWL_RATE_9M_INDEX
] = "9M",
3173 [IWL_RATE_12M_INDEX
] = "12M|MCS1",
3174 [IWL_RATE_18M_INDEX
] = "18M|MCS2",
3175 [IWL_RATE_24M_INDEX
] = "24M|MCS3",
3176 [IWL_RATE_36M_INDEX
] = "36M|MCS4",
3177 [IWL_RATE_48M_INDEX
] = "48M|MCS5",
3178 [IWL_RATE_54M_INDEX
] = "54M|MCS6",
3179 [IWL_RATE_MCS_7_INDEX
] = "MCS7",
3180 [IWL_RATE_MCS_8_INDEX
] = "MCS8",
3181 [IWL_RATE_MCS_9_INDEX
] = "MCS9",
3184 char *buff
, *pos
, *endpos
;
3187 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3188 struct rs_rate_stats
*stats
;
3189 static const size_t bufsz
= 1024;
3191 buff
= kmalloc(bufsz
, GFP_KERNEL
);
3196 endpos
= pos
+ bufsz
;
3198 pos
+= scnprintf(pos
, endpos
- pos
, "COLUMN,");
3199 for (rate
= 0; rate
< IWL_RATE_COUNT
; rate
++)
3200 pos
+= scnprintf(pos
, endpos
- pos
, "%s,", rate_name
[rate
]);
3201 pos
+= scnprintf(pos
, endpos
- pos
, "\n");
3203 for (col
= 0; col
< RS_COLUMN_COUNT
; col
++) {
3204 pos
+= scnprintf(pos
, endpos
- pos
,
3205 "%s,", column_name
[col
]);
3207 for (rate
= 0; rate
< IWL_RATE_COUNT
; rate
++) {
3208 stats
= &(lq_sta
->tx_stats
[col
][rate
]);
3209 pos
+= scnprintf(pos
, endpos
- pos
,
3214 pos
+= scnprintf(pos
, endpos
- pos
, "\n");
3217 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, pos
- buff
);
3222 static ssize_t
rs_sta_dbgfs_drv_tx_stats_write(struct file
*file
,
3223 const char __user
*user_buf
,
3224 size_t count
, loff_t
*ppos
)
3226 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3227 memset(lq_sta
->tx_stats
, 0, sizeof(lq_sta
->tx_stats
));
3232 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops
= {
3233 .read
= rs_sta_dbgfs_drv_tx_stats_read
,
3234 .write
= rs_sta_dbgfs_drv_tx_stats_write
,
3235 .open
= simple_open
,
3236 .llseek
= default_llseek
,
3239 static void rs_add_debugfs(void *mvm
, void *mvm_sta
, struct dentry
*dir
)
3241 struct iwl_lq_sta
*lq_sta
= mvm_sta
;
3242 lq_sta
->rs_sta_dbgfs_scale_table_file
=
3243 debugfs_create_file("rate_scale_table", S_IRUSR
| S_IWUSR
, dir
,
3244 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
3245 lq_sta
->rs_sta_dbgfs_stats_table_file
=
3246 debugfs_create_file("rate_stats_table", S_IRUSR
, dir
,
3247 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
3248 lq_sta
->rs_sta_dbgfs_drv_tx_stats_file
=
3249 debugfs_create_file("drv_tx_stats", S_IRUSR
| S_IWUSR
, dir
,
3250 lq_sta
, &rs_sta_dbgfs_drv_tx_stats_ops
);
3251 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
3252 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR
| S_IWUSR
, dir
,
3253 &lq_sta
->tx_agg_tid_en
);
3254 lq_sta
->rs_sta_dbgfs_reduced_txp_file
=
3255 debugfs_create_u8("reduced_tpc", S_IRUSR
| S_IWUSR
, dir
,
3256 &lq_sta
->dbg_fixed_txp_reduction
);
3259 static void rs_remove_debugfs(void *mvm
, void *mvm_sta
)
3261 struct iwl_lq_sta
*lq_sta
= mvm_sta
;
3262 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
3263 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
3264 debugfs_remove(lq_sta
->rs_sta_dbgfs_drv_tx_stats_file
);
3265 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
3266 debugfs_remove(lq_sta
->rs_sta_dbgfs_reduced_txp_file
);
3271 * Initialization of rate scaling information is done by driver after
3272 * the station is added. Since mac80211 calls this function before a
3273 * station is added we ignore it.
3275 static void rs_rate_init_stub(void *mvm_r
,
3276 struct ieee80211_supported_band
*sband
,
3277 struct cfg80211_chan_def
*chandef
,
3278 struct ieee80211_sta
*sta
, void *mvm_sta
)
3282 static const struct rate_control_ops rs_mvm_ops
= {
3284 .tx_status
= rs_tx_status
,
3285 .get_rate
= rs_get_rate
,
3286 .rate_init
= rs_rate_init_stub
,
3289 .alloc_sta
= rs_alloc_sta
,
3290 .free_sta
= rs_free_sta
,
3291 .rate_update
= rs_rate_update
,
3292 #ifdef CONFIG_MAC80211_DEBUGFS
3293 .add_sta_debugfs
= rs_add_debugfs
,
3294 .remove_sta_debugfs
= rs_remove_debugfs
,
3298 int iwl_mvm_rate_control_register(void)
3300 return ieee80211_rate_control_register(&rs_mvm_ops
);
3303 void iwl_mvm_rate_control_unregister(void)
3305 ieee80211_rate_control_unregister(&rs_mvm_ops
);
3309 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3310 * Tx protection, according to this rquest and previous requests,
3311 * and send the LQ command.
3312 * @mvmsta: The station
3313 * @enable: Enable Tx protection?
3315 int iwl_mvm_tx_protection(struct iwl_mvm
*mvm
, struct iwl_mvm_sta
*mvmsta
,
3318 struct iwl_lq_cmd
*lq
= &mvmsta
->lq_sta
.lq
;
3320 lockdep_assert_held(&mvm
->mutex
);
3323 if (mvmsta
->tx_protection
== 0)
3324 lq
->flags
|= LQ_FLAG_USE_RTS_MSK
;
3325 mvmsta
->tx_protection
++;
3327 mvmsta
->tx_protection
--;
3328 if (mvmsta
->tx_protection
== 0)
3329 lq
->flags
&= ~LQ_FLAG_USE_RTS_MSK
;
3332 return iwl_mvm_send_lq_cmd(mvm
, lq
, false);