1 /******************************************************************************
3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2015 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 <linuxwifi@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
139 typedef bool (*allow_column_func_t
) (struct iwl_mvm
*mvm
,
140 struct ieee80211_sta
*sta
,
141 struct rs_rate
*rate
,
142 const struct rs_tx_column
*next_col
);
144 struct rs_tx_column
{
145 enum rs_column_mode mode
;
148 enum rs_column next_columns
[MAX_NEXT_COLUMNS
];
149 allow_column_func_t checks
[MAX_COLUMN_CHECKS
];
152 static bool rs_ant_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
153 struct rs_rate
*rate
,
154 const struct rs_tx_column
*next_col
)
156 return iwl_mvm_bt_coex_is_ant_avail(mvm
, next_col
->ant
);
159 static bool rs_mimo_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
160 struct rs_rate
*rate
,
161 const struct rs_tx_column
*next_col
)
163 struct iwl_mvm_sta
*mvmsta
;
164 struct iwl_mvm_vif
*mvmvif
;
166 if (!sta
->ht_cap
.ht_supported
)
169 if (sta
->smps_mode
== IEEE80211_SMPS_STATIC
)
172 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm
)) < 2)
175 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
))
178 mvmsta
= iwl_mvm_sta_from_mac80211(sta
);
179 mvmvif
= iwl_mvm_vif_from_mac80211(mvmsta
->vif
);
181 if (mvm
->nvm_data
->sku_cap_mimo_disabled
)
187 static bool rs_siso_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
188 struct rs_rate
*rate
,
189 const struct rs_tx_column
*next_col
)
191 if (!sta
->ht_cap
.ht_supported
)
197 static bool rs_sgi_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
198 struct rs_rate
*rate
,
199 const struct rs_tx_column
*next_col
)
201 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
202 struct ieee80211_sta_vht_cap
*vht_cap
= &sta
->vht_cap
;
204 if (is_ht20(rate
) && (ht_cap
->cap
&
205 IEEE80211_HT_CAP_SGI_20
))
207 if (is_ht40(rate
) && (ht_cap
->cap
&
208 IEEE80211_HT_CAP_SGI_40
))
210 if (is_ht80(rate
) && (vht_cap
->cap
&
211 IEEE80211_VHT_CAP_SHORT_GI_80
))
217 static const struct rs_tx_column rs_tx_columns
[] = {
218 [RS_COLUMN_LEGACY_ANT_A
] = {
222 RS_COLUMN_LEGACY_ANT_B
,
223 RS_COLUMN_SISO_ANT_A
,
234 [RS_COLUMN_LEGACY_ANT_B
] = {
238 RS_COLUMN_LEGACY_ANT_A
,
239 RS_COLUMN_SISO_ANT_B
,
250 [RS_COLUMN_SISO_ANT_A
] = {
254 RS_COLUMN_SISO_ANT_B
,
256 RS_COLUMN_SISO_ANT_A_SGI
,
257 RS_COLUMN_LEGACY_ANT_A
,
258 RS_COLUMN_LEGACY_ANT_B
,
267 [RS_COLUMN_SISO_ANT_B
] = {
271 RS_COLUMN_SISO_ANT_A
,
273 RS_COLUMN_SISO_ANT_B_SGI
,
274 RS_COLUMN_LEGACY_ANT_A
,
275 RS_COLUMN_LEGACY_ANT_B
,
284 [RS_COLUMN_SISO_ANT_A_SGI
] = {
289 RS_COLUMN_SISO_ANT_B_SGI
,
291 RS_COLUMN_SISO_ANT_A
,
292 RS_COLUMN_LEGACY_ANT_A
,
293 RS_COLUMN_LEGACY_ANT_B
,
303 [RS_COLUMN_SISO_ANT_B_SGI
] = {
308 RS_COLUMN_SISO_ANT_A_SGI
,
310 RS_COLUMN_SISO_ANT_B
,
311 RS_COLUMN_LEGACY_ANT_A
,
312 RS_COLUMN_LEGACY_ANT_B
,
322 [RS_COLUMN_MIMO2
] = {
326 RS_COLUMN_SISO_ANT_A
,
328 RS_COLUMN_LEGACY_ANT_A
,
329 RS_COLUMN_LEGACY_ANT_B
,
338 [RS_COLUMN_MIMO2_SGI
] = {
343 RS_COLUMN_SISO_ANT_A_SGI
,
345 RS_COLUMN_LEGACY_ANT_A
,
346 RS_COLUMN_LEGACY_ANT_B
,
358 static inline u8
rs_extract_rate(u32 rate_n_flags
)
360 /* also works for HT because bits 7:6 are zero there */
361 return (u8
)(rate_n_flags
& RATE_LEGACY_RATE_MSK
);
364 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags
)
368 if (rate_n_flags
& RATE_MCS_HT_MSK
) {
369 idx
= rate_n_flags
& RATE_HT_MCS_RATE_CODE_MSK
;
370 idx
+= IWL_RATE_MCS_0_INDEX
;
372 /* skip 9M not supported in HT*/
373 if (idx
>= IWL_RATE_9M_INDEX
)
375 if ((idx
>= IWL_FIRST_HT_RATE
) && (idx
<= IWL_LAST_HT_RATE
))
377 } else if (rate_n_flags
& RATE_MCS_VHT_MSK
) {
378 idx
= rate_n_flags
& RATE_VHT_MCS_RATE_CODE_MSK
;
379 idx
+= IWL_RATE_MCS_0_INDEX
;
381 /* skip 9M not supported in VHT*/
382 if (idx
>= IWL_RATE_9M_INDEX
)
384 if ((idx
>= IWL_FIRST_VHT_RATE
) && (idx
<= IWL_LAST_VHT_RATE
))
387 /* legacy rate format, search for match in table */
389 u8 legacy_rate
= rs_extract_rate(rate_n_flags
);
390 for (idx
= 0; idx
< ARRAY_SIZE(iwl_rates
); idx
++)
391 if (iwl_rates
[idx
].plcp
== legacy_rate
)
395 return IWL_RATE_INVALID
;
398 static void rs_rate_scale_perform(struct iwl_mvm
*mvm
,
399 struct ieee80211_sta
*sta
,
400 struct iwl_lq_sta
*lq_sta
,
402 static void rs_fill_lq_cmd(struct iwl_mvm
*mvm
,
403 struct ieee80211_sta
*sta
,
404 struct iwl_lq_sta
*lq_sta
,
405 const struct rs_rate
*initial_rate
);
406 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
, bool force_search
);
409 * The following tables contain the expected throughput metrics for all rates
411 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
413 * where invalid entries are zeros.
415 * CCK rates are only valid in legacy table and will only be used in G
419 static const u16 expected_tpt_legacy
[IWL_RATE_COUNT
] = {
420 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
423 /* Expected TpT tables. 4 indexes:
424 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
426 static const u16 expected_tpt_siso_20MHz
[4][IWL_RATE_COUNT
] = {
427 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
428 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
429 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
430 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
433 static const u16 expected_tpt_siso_40MHz
[4][IWL_RATE_COUNT
] = {
434 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
435 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
436 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
437 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
440 static const u16 expected_tpt_siso_80MHz
[4][IWL_RATE_COUNT
] = {
441 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
442 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
443 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
444 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
447 static const u16 expected_tpt_mimo2_20MHz
[4][IWL_RATE_COUNT
] = {
448 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
449 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
450 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
451 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
454 static const u16 expected_tpt_mimo2_40MHz
[4][IWL_RATE_COUNT
] = {
455 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
456 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
457 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
458 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
461 static const u16 expected_tpt_mimo2_80MHz
[4][IWL_RATE_COUNT
] = {
462 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
463 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
464 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
465 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
469 static const struct iwl_rate_mcs_info iwl_rate_mcs
[IWL_RATE_COUNT
] = {
478 { "24", "16QAM 1/2"},
479 { "36", "16QAM 3/4"},
480 { "48", "64QAM 2/3"},
481 { "54", "64QAM 3/4"},
482 { "60", "64QAM 5/6"},
485 #define MCS_INDEX_PER_STREAM (8)
487 static const char *rs_pretty_ant(u8 ant
)
489 static const char * const ant_name
[] = {
503 return ant_name
[ant
];
506 static const char *rs_pretty_lq_type(enum iwl_table_type type
)
508 static const char * const lq_types
[] = {
510 [LQ_LEGACY_A
] = "LEGACY_A",
511 [LQ_LEGACY_G
] = "LEGACY_G",
512 [LQ_HT_SISO
] = "HT SISO",
513 [LQ_HT_MIMO2
] = "HT MIMO",
514 [LQ_VHT_SISO
] = "VHT SISO",
515 [LQ_VHT_MIMO2
] = "VHT MIMO",
518 if (type
< LQ_NONE
|| type
>= LQ_MAX
)
521 return lq_types
[type
];
524 static char *rs_pretty_rate(const struct rs_rate
*rate
)
527 static const char * const legacy_rates
[] = {
528 [IWL_RATE_1M_INDEX
] = "1M",
529 [IWL_RATE_2M_INDEX
] = "2M",
530 [IWL_RATE_5M_INDEX
] = "5.5M",
531 [IWL_RATE_11M_INDEX
] = "11M",
532 [IWL_RATE_6M_INDEX
] = "6M",
533 [IWL_RATE_9M_INDEX
] = "9M",
534 [IWL_RATE_12M_INDEX
] = "12M",
535 [IWL_RATE_18M_INDEX
] = "18M",
536 [IWL_RATE_24M_INDEX
] = "24M",
537 [IWL_RATE_36M_INDEX
] = "36M",
538 [IWL_RATE_48M_INDEX
] = "48M",
539 [IWL_RATE_54M_INDEX
] = "54M",
541 static const char *const ht_vht_rates
[] = {
542 [IWL_RATE_MCS_0_INDEX
] = "MCS0",
543 [IWL_RATE_MCS_1_INDEX
] = "MCS1",
544 [IWL_RATE_MCS_2_INDEX
] = "MCS2",
545 [IWL_RATE_MCS_3_INDEX
] = "MCS3",
546 [IWL_RATE_MCS_4_INDEX
] = "MCS4",
547 [IWL_RATE_MCS_5_INDEX
] = "MCS5",
548 [IWL_RATE_MCS_6_INDEX
] = "MCS6",
549 [IWL_RATE_MCS_7_INDEX
] = "MCS7",
550 [IWL_RATE_MCS_8_INDEX
] = "MCS8",
551 [IWL_RATE_MCS_9_INDEX
] = "MCS9",
553 const char *rate_str
;
555 if (is_type_legacy(rate
->type
) && (rate
->index
<= IWL_RATE_54M_INDEX
))
556 rate_str
= legacy_rates
[rate
->index
];
557 else if ((is_type_ht(rate
->type
) || is_type_vht(rate
->type
)) &&
558 (rate
->index
<= IWL_RATE_MCS_9_INDEX
))
559 rate_str
= ht_vht_rates
[rate
->index
];
561 rate_str
= "BAD_RATE";
563 sprintf(buf
, "(%s|%s|%s)", rs_pretty_lq_type(rate
->type
),
564 rs_pretty_ant(rate
->ant
), rate_str
);
568 static inline void rs_dump_rate(struct iwl_mvm
*mvm
, const struct rs_rate
*rate
,
572 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
573 prefix
, rs_pretty_rate(rate
), rate
->bw
,
574 rate
->sgi
, rate
->ldpc
, rate
->stbc
);
577 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data
*window
)
580 window
->success_counter
= 0;
581 window
->success_ratio
= IWL_INVALID_VALUE
;
583 window
->average_tpt
= IWL_INVALID_VALUE
;
586 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm
*mvm
,
587 struct iwl_scale_tbl_info
*tbl
)
591 IWL_DEBUG_RATE(mvm
, "Clearing up window stats\n");
592 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
593 rs_rate_scale_clear_window(&tbl
->win
[i
]);
595 for (i
= 0; i
< ARRAY_SIZE(tbl
->tpc_win
); i
++)
596 rs_rate_scale_clear_window(&tbl
->tpc_win
[i
]);
599 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
601 return (ant_type
& valid_antenna
) == ant_type
;
604 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm
*mvm
,
605 struct iwl_lq_sta
*lq_data
, u8 tid
,
606 struct ieee80211_sta
*sta
)
610 IWL_DEBUG_HT(mvm
, "Starting Tx agg: STA: %pM tid: %d\n",
612 ret
= ieee80211_start_tx_ba_session(sta
, tid
, 5000);
613 if (ret
== -EAGAIN
) {
615 * driver and mac80211 is out of sync
616 * this might be cause by reloading firmware
617 * stop the tx ba session here
619 IWL_ERR(mvm
, "Fail start Tx agg on tid: %d\n",
621 ieee80211_stop_tx_ba_session(sta
, tid
);
626 static void rs_tl_turn_on_agg(struct iwl_mvm
*mvm
, u8 tid
,
627 struct iwl_lq_sta
*lq_data
,
628 struct ieee80211_sta
*sta
)
630 if (tid
< IWL_MAX_TID_COUNT
)
631 rs_tl_turn_on_agg_for_tid(mvm
, lq_data
, tid
, sta
);
633 IWL_ERR(mvm
, "tid exceeds max TID count: %d/%d\n",
634 tid
, IWL_MAX_TID_COUNT
);
637 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
639 return !!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
640 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
641 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
);
645 * Static function to get the expected throughput from an iwl_scale_tbl_info
646 * that wraps a NULL pointer check
648 static s32
get_expected_tpt(struct iwl_scale_tbl_info
*tbl
, int rs_index
)
650 if (tbl
->expected_tpt
)
651 return tbl
->expected_tpt
[rs_index
];
656 * rs_collect_tx_data - Update the success/failure sliding window
658 * We keep a sliding window of the last 62 packets transmitted
659 * at this rate. window->data contains the bitmask of successful
662 static int _rs_collect_tx_data(struct iwl_mvm
*mvm
,
663 struct iwl_scale_tbl_info
*tbl
,
664 int scale_index
, int attempts
, int successes
,
665 struct iwl_rate_scale_data
*window
)
667 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
670 /* Get expected throughput */
671 tpt
= get_expected_tpt(tbl
, scale_index
);
674 * Keep track of only the latest 62 tx frame attempts in this rate's
675 * history window; anything older isn't really relevant any more.
676 * If we have filled up the sliding window, drop the oldest attempt;
677 * if the oldest attempt (highest bit in bitmap) shows "success",
678 * subtract "1" from the success counter (this is the main reason
679 * we keep these bitmaps!).
681 while (attempts
> 0) {
682 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
683 /* remove earliest */
684 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
686 if (window
->data
& mask
) {
687 window
->data
&= ~mask
;
688 window
->success_counter
--;
692 /* Increment frames-attempted counter */
695 /* Shift bitmap by one frame to throw away oldest history */
698 /* Mark the most recent #successes attempts as successful */
700 window
->success_counter
++;
708 /* Calculate current success ratio, avoid divide-by-0! */
709 if (window
->counter
> 0)
710 window
->success_ratio
= 128 * (100 * window
->success_counter
)
713 window
->success_ratio
= IWL_INVALID_VALUE
;
715 fail_count
= window
->counter
- window
->success_counter
;
717 /* Calculate average throughput, if we have enough history. */
718 if ((fail_count
>= IWL_MVM_RS_RATE_MIN_FAILURE_TH
) ||
719 (window
->success_counter
>= IWL_MVM_RS_RATE_MIN_SUCCESS_TH
))
720 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
722 window
->average_tpt
= IWL_INVALID_VALUE
;
727 static int rs_collect_tx_data(struct iwl_mvm
*mvm
,
728 struct iwl_lq_sta
*lq_sta
,
729 struct iwl_scale_tbl_info
*tbl
,
730 int scale_index
, int attempts
, int successes
,
733 struct iwl_rate_scale_data
*window
= NULL
;
736 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
739 if (tbl
->column
!= RS_COLUMN_INVALID
) {
740 struct lq_sta_pers
*pers
= &lq_sta
->pers
;
742 pers
->tx_stats
[tbl
->column
][scale_index
].total
+= attempts
;
743 pers
->tx_stats
[tbl
->column
][scale_index
].success
+= successes
;
746 /* Select window for current tx bit rate */
747 window
= &(tbl
->win
[scale_index
]);
749 ret
= _rs_collect_tx_data(mvm
, tbl
, scale_index
, attempts
, successes
,
754 if (WARN_ON_ONCE(reduced_txp
> TPC_MAX_REDUCTION
))
757 window
= &tbl
->tpc_win
[reduced_txp
];
758 return _rs_collect_tx_data(mvm
, tbl
, scale_index
, attempts
, successes
,
762 /* Convert rs_rate object into ucode rate bitmask */
763 static u32
ucode_rate_from_rs_rate(struct iwl_mvm
*mvm
,
764 struct rs_rate
*rate
)
767 int index
= rate
->index
;
769 ucode_rate
|= ((rate
->ant
<< RATE_MCS_ANT_POS
) &
770 RATE_MCS_ANT_ABC_MSK
);
772 if (is_legacy(rate
)) {
773 ucode_rate
|= iwl_rates
[index
].plcp
;
774 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
775 ucode_rate
|= RATE_MCS_CCK_MSK
;
780 if (index
< IWL_FIRST_HT_RATE
|| index
> IWL_LAST_HT_RATE
) {
781 IWL_ERR(mvm
, "Invalid HT rate index %d\n", index
);
782 index
= IWL_LAST_HT_RATE
;
784 ucode_rate
|= RATE_MCS_HT_MSK
;
786 if (is_ht_siso(rate
))
787 ucode_rate
|= iwl_rates
[index
].plcp_ht_siso
;
788 else if (is_ht_mimo2(rate
))
789 ucode_rate
|= iwl_rates
[index
].plcp_ht_mimo2
;
792 } else if (is_vht(rate
)) {
793 if (index
< IWL_FIRST_VHT_RATE
|| index
> IWL_LAST_VHT_RATE
) {
794 IWL_ERR(mvm
, "Invalid VHT rate index %d\n", index
);
795 index
= IWL_LAST_VHT_RATE
;
797 ucode_rate
|= RATE_MCS_VHT_MSK
;
798 if (is_vht_siso(rate
))
799 ucode_rate
|= iwl_rates
[index
].plcp_vht_siso
;
800 else if (is_vht_mimo2(rate
))
801 ucode_rate
|= iwl_rates
[index
].plcp_vht_mimo2
;
806 IWL_ERR(mvm
, "Invalid rate->type %d\n", rate
->type
);
809 if (is_siso(rate
) && rate
->stbc
) {
810 /* To enable STBC we need to set both a flag and ANT_AB */
811 ucode_rate
|= RATE_MCS_ANT_AB_MSK
;
812 ucode_rate
|= RATE_MCS_VHT_STBC_MSK
;
815 ucode_rate
|= rate
->bw
;
817 ucode_rate
|= RATE_MCS_SGI_MSK
;
819 ucode_rate
|= RATE_MCS_LDPC_MSK
;
824 /* Convert a ucode rate into an rs_rate object */
825 static int rs_rate_from_ucode_rate(const u32 ucode_rate
,
826 enum ieee80211_band band
,
827 struct rs_rate
*rate
)
829 u32 ant_msk
= ucode_rate
& RATE_MCS_ANT_ABC_MSK
;
830 u8 num_of_ant
= get_num_of_ant_from_rate(ucode_rate
);
833 memset(rate
, 0, sizeof(*rate
));
834 rate
->index
= iwl_hwrate_to_plcp_idx(ucode_rate
);
836 if (rate
->index
== IWL_RATE_INVALID
)
839 rate
->ant
= (ant_msk
>> RATE_MCS_ANT_POS
);
842 if (!(ucode_rate
& RATE_MCS_HT_MSK
) &&
843 !(ucode_rate
& RATE_MCS_VHT_MSK
)) {
844 if (num_of_ant
== 1) {
845 if (band
== IEEE80211_BAND_5GHZ
)
846 rate
->type
= LQ_LEGACY_A
;
848 rate
->type
= LQ_LEGACY_G
;
855 if (ucode_rate
& RATE_MCS_SGI_MSK
)
857 if (ucode_rate
& RATE_MCS_LDPC_MSK
)
859 if (ucode_rate
& RATE_MCS_VHT_STBC_MSK
)
861 if (ucode_rate
& RATE_MCS_BF_MSK
)
864 rate
->bw
= ucode_rate
& RATE_MCS_CHAN_WIDTH_MSK
;
866 if (ucode_rate
& RATE_MCS_HT_MSK
) {
867 nss
= ((ucode_rate
& RATE_HT_MCS_NSS_MSK
) >>
868 RATE_HT_MCS_NSS_POS
) + 1;
871 rate
->type
= LQ_HT_SISO
;
872 WARN_ONCE(!rate
->stbc
&& !rate
->bfer
&& num_of_ant
!= 1,
874 rate
->stbc
, rate
->bfer
);
875 } else if (nss
== 2) {
876 rate
->type
= LQ_HT_MIMO2
;
877 WARN_ON_ONCE(num_of_ant
!= 2);
881 } else if (ucode_rate
& RATE_MCS_VHT_MSK
) {
882 nss
= ((ucode_rate
& RATE_VHT_MCS_NSS_MSK
) >>
883 RATE_VHT_MCS_NSS_POS
) + 1;
886 rate
->type
= LQ_VHT_SISO
;
887 WARN_ONCE(!rate
->stbc
&& !rate
->bfer
&& num_of_ant
!= 1,
889 rate
->stbc
, rate
->bfer
);
890 } else if (nss
== 2) {
891 rate
->type
= LQ_VHT_MIMO2
;
892 WARN_ON_ONCE(num_of_ant
!= 2);
898 WARN_ON_ONCE(rate
->bw
== RATE_MCS_CHAN_WIDTH_160
);
899 WARN_ON_ONCE(rate
->bw
== RATE_MCS_CHAN_WIDTH_80
&&
905 /* switch to another antenna/antennas and return 1 */
906 /* if no other valid antenna found, return 0 */
907 static int rs_toggle_antenna(u32 valid_ant
, struct rs_rate
*rate
)
911 if (!rate
->ant
|| rate
->ant
> ANT_ABC
)
914 if (!rs_is_valid_ant(valid_ant
, rate
->ant
))
917 new_ant_type
= ant_toggle_lookup
[rate
->ant
];
919 while ((new_ant_type
!= rate
->ant
) &&
920 !rs_is_valid_ant(valid_ant
, new_ant_type
))
921 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
923 if (new_ant_type
== rate
->ant
)
926 rate
->ant
= new_ant_type
;
931 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
932 struct rs_rate
*rate
)
935 return lq_sta
->active_legacy_rate
;
936 else if (is_siso(rate
))
937 return lq_sta
->active_siso_rate
;
938 else if (is_mimo2(rate
))
939 return lq_sta
->active_mimo2_rate
;
945 static u16
rs_get_adjacent_rate(struct iwl_mvm
*mvm
, u8 index
, u16 rate_mask
,
948 u8 high
= IWL_RATE_INVALID
;
949 u8 low
= IWL_RATE_INVALID
;
951 /* 802.11A or ht walks to the next literal adjacent rate in
953 if (is_type_a_band(rate_type
) || !is_type_legacy(rate_type
)) {
957 /* Find the previous rate that is in the rate mask */
959 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
960 if (rate_mask
& mask
) {
966 /* Find the next rate that is in the rate mask */
968 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
969 if (rate_mask
& mask
) {
975 return (high
<< 8) | low
;
979 while (low
!= IWL_RATE_INVALID
) {
980 low
= iwl_rates
[low
].prev_rs
;
981 if (low
== IWL_RATE_INVALID
)
983 if (rate_mask
& (1 << low
))
988 while (high
!= IWL_RATE_INVALID
) {
989 high
= iwl_rates
[high
].next_rs
;
990 if (high
== IWL_RATE_INVALID
)
992 if (rate_mask
& (1 << high
))
996 return (high
<< 8) | low
;
999 static inline bool rs_rate_supported(struct iwl_lq_sta
*lq_sta
,
1000 struct rs_rate
*rate
)
1002 return BIT(rate
->index
) & rs_get_supported_rates(lq_sta
, rate
);
1005 /* Get the next supported lower rate in the current column.
1006 * Return true if bottom rate in the current column was reached
1008 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta
*lq_sta
,
1009 struct rs_rate
*rate
)
1014 struct iwl_mvm
*mvm
= lq_sta
->pers
.drv
;
1016 rate_mask
= rs_get_supported_rates(lq_sta
, rate
);
1017 high_low
= rs_get_adjacent_rate(mvm
, rate
->index
, rate_mask
,
1019 low
= high_low
& 0xff;
1021 /* Bottom rate of column reached */
1022 if (low
== IWL_RATE_INVALID
)
1029 /* Get the next rate to use following a column downgrade */
1030 static void rs_get_lower_rate_down_column(struct iwl_lq_sta
*lq_sta
,
1031 struct rs_rate
*rate
)
1033 struct iwl_mvm
*mvm
= lq_sta
->pers
.drv
;
1035 if (is_legacy(rate
)) {
1036 /* No column to downgrade from Legacy */
1038 } else if (is_siso(rate
)) {
1039 /* Downgrade to Legacy if we were in SISO */
1040 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1041 rate
->type
= LQ_LEGACY_A
;
1043 rate
->type
= LQ_LEGACY_G
;
1045 rate
->bw
= RATE_MCS_CHAN_WIDTH_20
;
1047 WARN_ON_ONCE(rate
->index
< IWL_RATE_MCS_0_INDEX
||
1048 rate
->index
> IWL_RATE_MCS_9_INDEX
);
1050 rate
->index
= rs_ht_to_legacy
[rate
->index
];
1053 /* Downgrade to SISO with same MCS if in MIMO */
1054 rate
->type
= is_vht_mimo2(rate
) ?
1055 LQ_VHT_SISO
: LQ_HT_SISO
;
1058 if (num_of_ant(rate
->ant
) > 1)
1059 rate
->ant
= first_antenna(iwl_mvm_get_valid_tx_ant(mvm
));
1061 /* Relevant in both switching to SISO or Legacy */
1064 if (!rs_rate_supported(lq_sta
, rate
))
1065 rs_get_lower_rate_in_column(lq_sta
, rate
);
1068 /* Check if both rates are identical
1069 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B
1070 * with a rate indicating STBC/BFER and ANT_AB.
1072 static inline bool rs_rate_equal(struct rs_rate
*a
,
1074 bool allow_ant_mismatch
)
1077 bool ant_match
= (a
->ant
== b
->ant
) && (a
->stbc
== b
->stbc
) &&
1078 (a
->bfer
== b
->bfer
);
1080 if (allow_ant_mismatch
) {
1081 if (a
->stbc
|| a
->bfer
) {
1082 WARN_ONCE(a
->ant
!= ANT_AB
, "stbc %d bfer %d ant %d",
1083 a
->stbc
, a
->bfer
, a
->ant
);
1084 ant_match
|= (b
->ant
== ANT_A
|| b
->ant
== ANT_B
);
1085 } else if (b
->stbc
|| b
->bfer
) {
1086 WARN_ONCE(b
->ant
!= ANT_AB
, "stbc %d bfer %d ant %d",
1087 b
->stbc
, b
->bfer
, b
->ant
);
1088 ant_match
|= (a
->ant
== ANT_A
|| a
->ant
== ANT_B
);
1092 return (a
->type
== b
->type
) && (a
->bw
== b
->bw
) && (a
->sgi
== b
->sgi
) &&
1093 (a
->ldpc
== b
->ldpc
) && (a
->index
== b
->index
) && ant_match
;
1096 /* Check if both rates share the same column */
1097 static inline bool rs_rate_column_match(struct rs_rate
*a
,
1102 if (a
->stbc
|| a
->bfer
)
1103 ant_match
= (b
->ant
== ANT_A
|| b
->ant
== ANT_B
);
1105 ant_match
= (a
->ant
== b
->ant
);
1107 return (a
->type
== b
->type
) && (a
->bw
== b
->bw
) && (a
->sgi
== b
->sgi
)
1111 static inline enum rs_column
rs_get_column_from_rate(struct rs_rate
*rate
)
1113 if (is_legacy(rate
)) {
1114 if (rate
->ant
== ANT_A
)
1115 return RS_COLUMN_LEGACY_ANT_A
;
1117 if (rate
->ant
== ANT_B
)
1118 return RS_COLUMN_LEGACY_ANT_B
;
1123 if (is_siso(rate
)) {
1124 if (rate
->ant
== ANT_A
|| rate
->stbc
|| rate
->bfer
)
1125 return rate
->sgi
? RS_COLUMN_SISO_ANT_A_SGI
:
1126 RS_COLUMN_SISO_ANT_A
;
1128 if (rate
->ant
== ANT_B
)
1129 return rate
->sgi
? RS_COLUMN_SISO_ANT_B_SGI
:
1130 RS_COLUMN_SISO_ANT_B
;
1136 return rate
->sgi
? RS_COLUMN_MIMO2_SGI
: RS_COLUMN_MIMO2
;
1139 return RS_COLUMN_INVALID
;
1142 static u8
rs_get_tid(struct ieee80211_hdr
*hdr
)
1144 u8 tid
= IWL_MAX_TID_COUNT
;
1146 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
1147 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
1151 if (unlikely(tid
> IWL_MAX_TID_COUNT
))
1152 tid
= IWL_MAX_TID_COUNT
;
1157 void iwl_mvm_rs_tx_status(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
1158 int tid
, struct ieee80211_tx_info
*info
)
1163 struct iwl_lq_cmd
*table
;
1165 struct rs_rate lq_rate
, tx_resp_rate
;
1166 struct iwl_scale_tbl_info
*curr_tbl
, *other_tbl
, *tmp_tbl
;
1167 u8 reduced_txp
= (uintptr_t)info
->status
.status_driver_data
[0];
1168 u32 tx_resp_hwrate
= (uintptr_t)info
->status
.status_driver_data
[1];
1169 struct iwl_mvm_sta
*mvmsta
= iwl_mvm_sta_from_mac80211(sta
);
1170 struct iwl_lq_sta
*lq_sta
= &mvmsta
->lq_sta
;
1171 bool allow_ant_mismatch
= fw_has_api(&mvm
->fw
->ucode_capa
,
1172 IWL_UCODE_TLV_API_LQ_SS_PARAMS
);
1174 /* Treat uninitialized rate scaling data same as non-existing. */
1176 IWL_DEBUG_RATE(mvm
, "Station rate scaling not created yet.\n");
1178 } else if (!lq_sta
->pers
.drv
) {
1179 IWL_DEBUG_RATE(mvm
, "Rate scaling not initialized yet.\n");
1183 /* This packet was aggregated but doesn't carry status info */
1184 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
1185 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
1188 rs_rate_from_ucode_rate(tx_resp_hwrate
, info
->band
, &tx_resp_rate
);
1190 #ifdef CONFIG_MAC80211_DEBUGFS
1191 /* Disable last tx check if we are debugging with fixed rate but
1192 * update tx stats */
1193 if (lq_sta
->pers
.dbg_fixed_rate
) {
1194 int index
= tx_resp_rate
.index
;
1195 enum rs_column column
;
1196 int attempts
, success
;
1198 column
= rs_get_column_from_rate(&tx_resp_rate
);
1199 if (WARN_ONCE(column
== RS_COLUMN_INVALID
,
1200 "Can't map rate 0x%x to column",
1204 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
) {
1205 attempts
= info
->status
.ampdu_len
;
1206 success
= info
->status
.ampdu_ack_len
;
1208 attempts
= info
->status
.rates
[0].count
;
1209 success
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
1212 lq_sta
->pers
.tx_stats
[column
][index
].total
+= attempts
;
1213 lq_sta
->pers
.tx_stats
[column
][index
].success
+= success
;
1215 IWL_DEBUG_RATE(mvm
, "Fixed rate 0x%x success %d attempts %d\n",
1216 tx_resp_hwrate
, success
, attempts
);
1221 if (time_after(jiffies
,
1222 (unsigned long)(lq_sta
->last_tx
+
1223 (IWL_MVM_RS_IDLE_TIMEOUT
* HZ
)))) {
1226 IWL_DEBUG_RATE(mvm
, "Tx idle for too long. reinit rs\n");
1227 for (t
= 0; t
< IWL_MAX_TID_COUNT
; t
++)
1228 ieee80211_stop_tx_ba_session(sta
, t
);
1230 iwl_mvm_rs_rate_init(mvm
, sta
, info
->band
, false);
1233 lq_sta
->last_tx
= jiffies
;
1235 /* Ignore this Tx frame response if its initial rate doesn't match
1236 * that of latest Link Quality command. There may be stragglers
1237 * from a previous Link Quality command, but we're no longer interested
1238 * in those; they're either from the "active" mode while we're trying
1239 * to check "search" mode, or a prior "search" mode after we've moved
1240 * to a new "search" mode (which might become the new "active" mode).
1242 table
= &lq_sta
->lq
;
1243 lq_hwrate
= le32_to_cpu(table
->rs_table
[0]);
1244 rs_rate_from_ucode_rate(lq_hwrate
, info
->band
, &lq_rate
);
1246 /* Here we actually compare this rate to the latest LQ command */
1247 if (!rs_rate_equal(&tx_resp_rate
, &lq_rate
, allow_ant_mismatch
)) {
1249 "initial tx resp rate 0x%x does not match 0x%x\n",
1250 tx_resp_hwrate
, lq_hwrate
);
1253 * Since rates mis-match, the last LQ command may have failed.
1254 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1257 lq_sta
->missed_rate_counter
++;
1258 if (lq_sta
->missed_rate_counter
> IWL_MVM_RS_MISSED_RATE_MAX
) {
1259 lq_sta
->missed_rate_counter
= 0;
1261 "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1263 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, false);
1265 /* Regardless, ignore this status info for outdated rate */
1268 /* Rate did match, so reset the missed_rate_counter */
1269 lq_sta
->missed_rate_counter
= 0;
1271 if (!lq_sta
->search_better_tbl
) {
1272 curr_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1273 other_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1275 curr_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1276 other_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1279 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate
, &curr_tbl
->rate
))) {
1281 "Neither active nor search matches tx rate\n");
1282 tmp_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1283 rs_dump_rate(mvm
, &tmp_tbl
->rate
, "ACTIVE");
1284 tmp_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1285 rs_dump_rate(mvm
, &tmp_tbl
->rate
, "SEARCH");
1286 rs_dump_rate(mvm
, &lq_rate
, "ACTUAL");
1289 * no matching table found, let's by-pass the data collection
1290 * and continue to perform rate scale to find the rate table
1292 rs_stay_in_table(lq_sta
, true);
1297 * Updating the frame history depends on whether packets were
1300 * For aggregation, all packets were transmitted at the same rate, the
1301 * first index into rate scale table.
1303 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
) {
1304 /* ampdu_ack_len = 0 marks no BA was received. In this case
1305 * treat it as a single frame loss as we don't want the success
1306 * ratio to dip too quickly because a BA wasn't received
1308 if (info
->status
.ampdu_ack_len
== 0)
1309 info
->status
.ampdu_len
= 1;
1311 rs_collect_tx_data(mvm
, lq_sta
, curr_tbl
, lq_rate
.index
,
1312 info
->status
.ampdu_len
,
1313 info
->status
.ampdu_ack_len
,
1316 /* Update success/fail counts if not searching for new mode */
1317 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
) {
1318 lq_sta
->total_success
+= info
->status
.ampdu_ack_len
;
1319 lq_sta
->total_failed
+= (info
->status
.ampdu_len
-
1320 info
->status
.ampdu_ack_len
);
1323 /* For legacy, update frame history with for each Tx retry. */
1324 retries
= info
->status
.rates
[0].count
- 1;
1325 /* HW doesn't send more than 15 retries */
1326 retries
= min(retries
, 15);
1328 /* The last transmission may have been successful */
1329 legacy_success
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
1330 /* Collect data for each rate used during failed TX attempts */
1331 for (i
= 0; i
<= retries
; ++i
) {
1332 lq_hwrate
= le32_to_cpu(table
->rs_table
[i
]);
1333 rs_rate_from_ucode_rate(lq_hwrate
, info
->band
,
1336 * Only collect stats if retried rate is in the same RS
1337 * table as active/search.
1339 if (rs_rate_column_match(&lq_rate
, &curr_tbl
->rate
))
1341 else if (rs_rate_column_match(&lq_rate
,
1343 tmp_tbl
= other_tbl
;
1347 rs_collect_tx_data(mvm
, lq_sta
, tmp_tbl
, lq_rate
.index
,
1348 1, i
< retries
? 0 : legacy_success
,
1352 /* Update success/fail counts if not searching for new mode */
1353 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
) {
1354 lq_sta
->total_success
+= legacy_success
;
1355 lq_sta
->total_failed
+= retries
+ (1 - legacy_success
);
1358 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1359 lq_sta
->last_rate_n_flags
= lq_hwrate
;
1360 IWL_DEBUG_RATE(mvm
, "reduced txpower: %d\n", reduced_txp
);
1362 /* See if there's a better rate or modulation mode to try. */
1363 if (sta
->supp_rates
[info
->band
])
1364 rs_rate_scale_perform(mvm
, sta
, lq_sta
, tid
);
1368 * mac80211 sends us Tx status
1370 static void rs_mac80211_tx_status(void *mvm_r
,
1371 struct ieee80211_supported_band
*sband
,
1372 struct ieee80211_sta
*sta
, void *priv_sta
,
1373 struct sk_buff
*skb
)
1375 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1376 struct iwl_op_mode
*op_mode
= (struct iwl_op_mode
*)mvm_r
;
1377 struct iwl_mvm
*mvm
= IWL_OP_MODE_GET_MVM(op_mode
);
1378 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1380 if (!iwl_mvm_sta_from_mac80211(sta
)->vif
)
1383 if (!ieee80211_is_data(hdr
->frame_control
) ||
1384 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
1387 iwl_mvm_rs_tx_status(mvm
, sta
, rs_get_tid(hdr
), info
);
1391 * Begin a period of staying with a selected modulation mode.
1392 * Set "stay_in_tbl" flag to prevent any mode switches.
1393 * Set frame tx success limits according to legacy vs. high-throughput,
1394 * and reset overall (spanning all rates) tx success history statistics.
1395 * These control how long we stay using same modulation mode before
1396 * searching for a new mode.
1398 static void rs_set_stay_in_table(struct iwl_mvm
*mvm
, u8 is_legacy
,
1399 struct iwl_lq_sta
*lq_sta
)
1401 IWL_DEBUG_RATE(mvm
, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1402 lq_sta
->rs_state
= RS_STATE_STAY_IN_COLUMN
;
1404 lq_sta
->table_count_limit
= IWL_MVM_RS_LEGACY_TABLE_COUNT
;
1405 lq_sta
->max_failure_limit
= IWL_MVM_RS_LEGACY_FAILURE_LIMIT
;
1406 lq_sta
->max_success_limit
= IWL_MVM_RS_LEGACY_SUCCESS_LIMIT
;
1408 lq_sta
->table_count_limit
= IWL_MVM_RS_NON_LEGACY_TABLE_COUNT
;
1409 lq_sta
->max_failure_limit
= IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT
;
1410 lq_sta
->max_success_limit
= IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT
;
1412 lq_sta
->table_count
= 0;
1413 lq_sta
->total_failed
= 0;
1414 lq_sta
->total_success
= 0;
1415 lq_sta
->flush_timer
= jiffies
;
1416 lq_sta
->visited_columns
= 0;
1419 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask
)
1422 return find_last_bit(&rate_mask
, BITS_PER_LONG
);
1423 return IWL_RATE_INVALID
;
1426 static int rs_get_max_allowed_rate(struct iwl_lq_sta
*lq_sta
,
1427 const struct rs_tx_column
*column
)
1429 switch (column
->mode
) {
1431 return lq_sta
->max_legacy_rate_idx
;
1433 return lq_sta
->max_siso_rate_idx
;
1435 return lq_sta
->max_mimo2_rate_idx
;
1440 return lq_sta
->max_legacy_rate_idx
;
1443 static const u16
*rs_get_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1444 const struct rs_tx_column
*column
,
1447 /* Used to choose among HT tables */
1448 const u16 (*ht_tbl_pointer
)[IWL_RATE_COUNT
];
1450 if (WARN_ON_ONCE(column
->mode
!= RS_LEGACY
&&
1451 column
->mode
!= RS_SISO
&&
1452 column
->mode
!= RS_MIMO2
))
1453 return expected_tpt_legacy
;
1455 /* Legacy rates have only one table */
1456 if (column
->mode
== RS_LEGACY
)
1457 return expected_tpt_legacy
;
1459 ht_tbl_pointer
= expected_tpt_mimo2_20MHz
;
1460 /* Choose among many HT tables depending on number of streams
1461 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1463 if (column
->mode
== RS_SISO
) {
1465 case RATE_MCS_CHAN_WIDTH_20
:
1466 ht_tbl_pointer
= expected_tpt_siso_20MHz
;
1468 case RATE_MCS_CHAN_WIDTH_40
:
1469 ht_tbl_pointer
= expected_tpt_siso_40MHz
;
1471 case RATE_MCS_CHAN_WIDTH_80
:
1472 ht_tbl_pointer
= expected_tpt_siso_80MHz
;
1477 } else if (column
->mode
== RS_MIMO2
) {
1479 case RATE_MCS_CHAN_WIDTH_20
:
1480 ht_tbl_pointer
= expected_tpt_mimo2_20MHz
;
1482 case RATE_MCS_CHAN_WIDTH_40
:
1483 ht_tbl_pointer
= expected_tpt_mimo2_40MHz
;
1485 case RATE_MCS_CHAN_WIDTH_80
:
1486 ht_tbl_pointer
= expected_tpt_mimo2_80MHz
;
1495 if (!column
->sgi
&& !lq_sta
->is_agg
) /* Normal */
1496 return ht_tbl_pointer
[0];
1497 else if (column
->sgi
&& !lq_sta
->is_agg
) /* SGI */
1498 return ht_tbl_pointer
[1];
1499 else if (!column
->sgi
&& lq_sta
->is_agg
) /* AGG */
1500 return ht_tbl_pointer
[2];
1502 return ht_tbl_pointer
[3];
1505 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1506 struct iwl_scale_tbl_info
*tbl
)
1508 struct rs_rate
*rate
= &tbl
->rate
;
1509 const struct rs_tx_column
*column
= &rs_tx_columns
[tbl
->column
];
1511 tbl
->expected_tpt
= rs_get_expected_tpt_table(lq_sta
, column
, rate
->bw
);
1514 static s32
rs_get_best_rate(struct iwl_mvm
*mvm
,
1515 struct iwl_lq_sta
*lq_sta
,
1516 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1517 unsigned long rate_mask
, s8 index
)
1519 struct iwl_scale_tbl_info
*active_tbl
=
1520 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1521 s32 success_ratio
= active_tbl
->win
[index
].success_ratio
;
1522 u16 expected_current_tpt
= active_tbl
->expected_tpt
[index
];
1523 const u16
*tpt_tbl
= tbl
->expected_tpt
;
1528 if (success_ratio
>= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE
)) {
1529 target_tpt
= 100 * expected_current_tpt
;
1531 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1532 success_ratio
, target_tpt
);
1534 target_tpt
= lq_sta
->last_tpt
;
1536 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1537 success_ratio
, target_tpt
);
1540 rate_idx
= find_first_bit(&rate_mask
, BITS_PER_LONG
);
1542 while (rate_idx
!= IWL_RATE_INVALID
) {
1543 if (target_tpt
< (100 * tpt_tbl
[rate_idx
]))
1546 high_low
= rs_get_adjacent_rate(mvm
, rate_idx
, rate_mask
,
1549 rate_idx
= (high_low
>> 8) & 0xff;
1552 IWL_DEBUG_RATE(mvm
, "Best rate found %d target_tp %d expected_new %d\n",
1553 rate_idx
, target_tpt
,
1554 rate_idx
!= IWL_RATE_INVALID
?
1555 100 * tpt_tbl
[rate_idx
] : IWL_INVALID_VALUE
);
1560 static u32
rs_bw_from_sta_bw(struct ieee80211_sta
*sta
)
1562 if (sta
->bandwidth
>= IEEE80211_STA_RX_BW_80
)
1563 return RATE_MCS_CHAN_WIDTH_80
;
1564 else if (sta
->bandwidth
>= IEEE80211_STA_RX_BW_40
)
1565 return RATE_MCS_CHAN_WIDTH_40
;
1567 return RATE_MCS_CHAN_WIDTH_20
;
1571 * Check whether we should continue using same modulation mode, or
1572 * begin search for a new mode, based on:
1573 * 1) # tx successes or failures while using this mode
1574 * 2) # times calling this function
1575 * 3) elapsed time in this mode (not used, for now)
1577 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
, bool force_search
)
1579 struct iwl_scale_tbl_info
*tbl
;
1581 int flush_interval_passed
= 0;
1582 struct iwl_mvm
*mvm
;
1584 mvm
= lq_sta
->pers
.drv
;
1585 active_tbl
= lq_sta
->active_tbl
;
1587 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1589 /* If we've been disallowing search, see if we should now allow it */
1590 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
) {
1591 /* Elapsed time using current modulation mode */
1592 if (lq_sta
->flush_timer
)
1593 flush_interval_passed
=
1595 (unsigned long)(lq_sta
->flush_timer
+
1596 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT
* HZ
)));
1599 * Check if we should allow search for new modulation mode.
1600 * If many frames have failed or succeeded, or we've used
1601 * this same modulation for a long time, allow search, and
1602 * reset history stats that keep track of whether we should
1603 * allow a new search. Also (below) reset all bitmaps and
1604 * stats in active history.
1607 (lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1608 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1609 ((!lq_sta
->search_better_tbl
) &&
1610 (lq_sta
->flush_timer
) && (flush_interval_passed
))) {
1612 "LQ: stay is expired %d %d %d\n",
1613 lq_sta
->total_failed
,
1614 lq_sta
->total_success
,
1615 flush_interval_passed
);
1617 /* Allow search for new mode */
1618 lq_sta
->rs_state
= RS_STATE_SEARCH_CYCLE_STARTED
;
1620 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1621 lq_sta
->total_failed
= 0;
1622 lq_sta
->total_success
= 0;
1623 lq_sta
->flush_timer
= 0;
1624 /* mark the current column as visited */
1625 lq_sta
->visited_columns
= BIT(tbl
->column
);
1627 * Else if we've used this modulation mode enough repetitions
1628 * (regardless of elapsed time or success/failure), reset
1629 * history bitmaps and rate-specific stats for all rates in
1633 lq_sta
->table_count
++;
1634 if (lq_sta
->table_count
>=
1635 lq_sta
->table_count_limit
) {
1636 lq_sta
->table_count
= 0;
1639 "LQ: stay in table clear win\n");
1640 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
1644 /* If transitioning to allow "search", reset all history
1645 * bitmaps and stats in active table (this will become the new
1646 * "search" table). */
1647 if (lq_sta
->rs_state
== RS_STATE_SEARCH_CYCLE_STARTED
) {
1648 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
1654 * setup rate table in uCode
1656 static void rs_update_rate_tbl(struct iwl_mvm
*mvm
,
1657 struct ieee80211_sta
*sta
,
1658 struct iwl_lq_sta
*lq_sta
,
1659 struct iwl_scale_tbl_info
*tbl
)
1661 rs_fill_lq_cmd(mvm
, sta
, lq_sta
, &tbl
->rate
);
1662 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, false);
1665 static bool rs_tweak_rate_tbl(struct iwl_mvm
*mvm
,
1666 struct ieee80211_sta
*sta
,
1667 struct iwl_lq_sta
*lq_sta
,
1668 struct iwl_scale_tbl_info
*tbl
,
1669 enum rs_action scale_action
)
1671 if (sta
->bandwidth
!= IEEE80211_STA_RX_BW_80
)
1674 if (!is_vht_siso(&tbl
->rate
))
1677 if ((tbl
->rate
.bw
== RATE_MCS_CHAN_WIDTH_80
) &&
1678 (tbl
->rate
.index
== IWL_RATE_MCS_0_INDEX
) &&
1679 (scale_action
== RS_ACTION_DOWNSCALE
)) {
1680 tbl
->rate
.bw
= RATE_MCS_CHAN_WIDTH_20
;
1681 tbl
->rate
.index
= IWL_RATE_MCS_4_INDEX
;
1682 IWL_DEBUG_RATE(mvm
, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1686 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1687 * sustainable, i.e. we're past the test window. We can't go back
1688 * if MCS5 is just tested as this will happen always after switching
1689 * to 20Mhz MCS4 because the rate stats are cleared.
1691 if ((tbl
->rate
.bw
== RATE_MCS_CHAN_WIDTH_20
) &&
1692 (((tbl
->rate
.index
== IWL_RATE_MCS_5_INDEX
) &&
1693 (scale_action
== RS_ACTION_STAY
)) ||
1694 ((tbl
->rate
.index
> IWL_RATE_MCS_5_INDEX
) &&
1695 (scale_action
== RS_ACTION_UPSCALE
)))) {
1696 tbl
->rate
.bw
= RATE_MCS_CHAN_WIDTH_80
;
1697 tbl
->rate
.index
= IWL_RATE_MCS_1_INDEX
;
1698 IWL_DEBUG_RATE(mvm
, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1705 rs_set_expected_tpt_table(lq_sta
, tbl
);
1706 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
1710 static enum rs_column
rs_get_next_column(struct iwl_mvm
*mvm
,
1711 struct iwl_lq_sta
*lq_sta
,
1712 struct ieee80211_sta
*sta
,
1713 struct iwl_scale_tbl_info
*tbl
)
1716 enum rs_column next_col_id
;
1717 const struct rs_tx_column
*curr_col
= &rs_tx_columns
[tbl
->column
];
1718 const struct rs_tx_column
*next_col
;
1719 allow_column_func_t allow_func
;
1720 u8 valid_ants
= iwl_mvm_get_valid_tx_ant(mvm
);
1721 const u16
*expected_tpt_tbl
;
1722 u16 tpt
, max_expected_tpt
;
1724 for (i
= 0; i
< MAX_NEXT_COLUMNS
; i
++) {
1725 next_col_id
= curr_col
->next_columns
[i
];
1727 if (next_col_id
== RS_COLUMN_INVALID
)
1730 if (lq_sta
->visited_columns
& BIT(next_col_id
)) {
1731 IWL_DEBUG_RATE(mvm
, "Skip already visited column %d\n",
1736 next_col
= &rs_tx_columns
[next_col_id
];
1738 if (!rs_is_valid_ant(valid_ants
, next_col
->ant
)) {
1740 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1741 next_col_id
, valid_ants
, next_col
->ant
);
1745 for (j
= 0; j
< MAX_COLUMN_CHECKS
; j
++) {
1746 allow_func
= next_col
->checks
[j
];
1747 if (allow_func
&& !allow_func(mvm
, sta
, &tbl
->rate
,
1752 if (j
!= MAX_COLUMN_CHECKS
) {
1754 "Skip column %d: not allowed (check %d failed)\n",
1760 tpt
= lq_sta
->last_tpt
/ 100;
1761 expected_tpt_tbl
= rs_get_expected_tpt_table(lq_sta
, next_col
,
1762 rs_bw_from_sta_bw(sta
));
1763 if (WARN_ON_ONCE(!expected_tpt_tbl
))
1766 max_rate
= rs_get_max_allowed_rate(lq_sta
, next_col
);
1767 if (max_rate
== IWL_RATE_INVALID
) {
1769 "Skip column %d: no rate is allowed in this column\n",
1774 max_expected_tpt
= expected_tpt_tbl
[max_rate
];
1775 if (tpt
>= max_expected_tpt
) {
1777 "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1778 next_col_id
, max_expected_tpt
, tpt
);
1783 "Found potential column %d. Max expected %d current %d\n",
1784 next_col_id
, max_expected_tpt
, tpt
);
1788 if (i
== MAX_NEXT_COLUMNS
)
1789 return RS_COLUMN_INVALID
;
1794 static int rs_switch_to_column(struct iwl_mvm
*mvm
,
1795 struct iwl_lq_sta
*lq_sta
,
1796 struct ieee80211_sta
*sta
,
1797 enum rs_column col_id
)
1799 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1800 struct iwl_scale_tbl_info
*search_tbl
=
1801 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1802 struct rs_rate
*rate
= &search_tbl
->rate
;
1803 const struct rs_tx_column
*column
= &rs_tx_columns
[col_id
];
1804 const struct rs_tx_column
*curr_column
= &rs_tx_columns
[tbl
->column
];
1805 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1806 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1807 unsigned long rate_mask
= 0;
1810 memcpy(search_tbl
, tbl
, sz
);
1812 rate
->sgi
= column
->sgi
;
1813 rate
->ant
= column
->ant
;
1815 if (column
->mode
== RS_LEGACY
) {
1816 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1817 rate
->type
= LQ_LEGACY_A
;
1819 rate
->type
= LQ_LEGACY_G
;
1821 rate
->bw
= RATE_MCS_CHAN_WIDTH_20
;
1823 rate_mask
= lq_sta
->active_legacy_rate
;
1824 } else if (column
->mode
== RS_SISO
) {
1825 rate
->type
= lq_sta
->is_vht
? LQ_VHT_SISO
: LQ_HT_SISO
;
1826 rate_mask
= lq_sta
->active_siso_rate
;
1827 } else if (column
->mode
== RS_MIMO2
) {
1828 rate
->type
= lq_sta
->is_vht
? LQ_VHT_MIMO2
: LQ_HT_MIMO2
;
1829 rate_mask
= lq_sta
->active_mimo2_rate
;
1831 WARN_ONCE(1, "Bad column mode");
1834 if (column
->mode
!= RS_LEGACY
) {
1835 rate
->bw
= rs_bw_from_sta_bw(sta
);
1836 rate
->ldpc
= lq_sta
->ldpc
;
1839 search_tbl
->column
= col_id
;
1840 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1842 lq_sta
->visited_columns
|= BIT(col_id
);
1844 /* Get the best matching rate if we're changing modes. e.g.
1845 * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1847 if (curr_column
->mode
!= column
->mode
) {
1848 rate_idx
= rs_get_best_rate(mvm
, lq_sta
, search_tbl
,
1849 rate_mask
, rate
->index
);
1851 if ((rate_idx
== IWL_RATE_INVALID
) ||
1852 !(BIT(rate_idx
) & rate_mask
)) {
1854 "can not switch with index %d"
1856 rate_idx
, rate_mask
);
1861 rate
->index
= rate_idx
;
1864 IWL_DEBUG_RATE(mvm
, "Switched to column %d: Index %d\n",
1865 col_id
, rate
->index
);
1870 rate
->type
= LQ_NONE
;
1874 static enum rs_action
rs_get_rate_action(struct iwl_mvm
*mvm
,
1875 struct iwl_scale_tbl_info
*tbl
,
1876 s32 sr
, int low
, int high
,
1878 int low_tpt
, int high_tpt
)
1880 enum rs_action action
= RS_ACTION_STAY
;
1882 if ((sr
<= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE
)) ||
1883 (current_tpt
== 0)) {
1885 "Decrease rate because of low SR\n");
1886 return RS_ACTION_DOWNSCALE
;
1889 if ((low_tpt
== IWL_INVALID_VALUE
) &&
1890 (high_tpt
== IWL_INVALID_VALUE
) &&
1891 (high
!= IWL_RATE_INVALID
)) {
1893 "No data about high/low rates. Increase rate\n");
1894 return RS_ACTION_UPSCALE
;
1897 if ((high_tpt
== IWL_INVALID_VALUE
) &&
1898 (high
!= IWL_RATE_INVALID
) &&
1899 (low_tpt
!= IWL_INVALID_VALUE
) &&
1900 (low_tpt
< current_tpt
)) {
1902 "No data about high rate and low rate is worse. Increase rate\n");
1903 return RS_ACTION_UPSCALE
;
1906 if ((high_tpt
!= IWL_INVALID_VALUE
) &&
1907 (high_tpt
> current_tpt
)) {
1909 "Higher rate is better. Increate rate\n");
1910 return RS_ACTION_UPSCALE
;
1913 if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1914 (high_tpt
!= IWL_INVALID_VALUE
) &&
1915 (low_tpt
< current_tpt
) &&
1916 (high_tpt
< current_tpt
)) {
1918 "Both high and low are worse. Maintain rate\n");
1919 return RS_ACTION_STAY
;
1922 if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1923 (low_tpt
> current_tpt
)) {
1925 "Lower rate is better\n");
1926 action
= RS_ACTION_DOWNSCALE
;
1930 if ((low_tpt
== IWL_INVALID_VALUE
) &&
1931 (low
!= IWL_RATE_INVALID
)) {
1933 "No data about lower rate\n");
1934 action
= RS_ACTION_DOWNSCALE
;
1938 IWL_DEBUG_RATE(mvm
, "Maintain rate\n");
1941 if ((action
== RS_ACTION_DOWNSCALE
) && (low
!= IWL_RATE_INVALID
)) {
1942 if (sr
>= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE
)) {
1944 "SR is above NO DECREASE. Avoid downscale\n");
1945 action
= RS_ACTION_STAY
;
1946 } else if (current_tpt
> (100 * tbl
->expected_tpt
[low
])) {
1948 "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1949 action
= RS_ACTION_STAY
;
1951 IWL_DEBUG_RATE(mvm
, "Decrease rate\n");
1958 static bool rs_stbc_allow(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
1959 struct iwl_lq_sta
*lq_sta
)
1961 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1962 * supports STBC of at least 1*SS
1964 if (!lq_sta
->stbc_capable
)
1967 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
))
1973 static void rs_get_adjacent_txp(struct iwl_mvm
*mvm
, int index
,
1974 int *weaker
, int *stronger
)
1976 *weaker
= index
+ IWL_MVM_RS_TPC_TX_POWER_STEP
;
1977 if (*weaker
> TPC_MAX_REDUCTION
)
1978 *weaker
= TPC_INVALID
;
1980 *stronger
= index
- IWL_MVM_RS_TPC_TX_POWER_STEP
;
1982 *stronger
= TPC_INVALID
;
1985 static bool rs_tpc_allowed(struct iwl_mvm
*mvm
, struct ieee80211_vif
*vif
,
1986 struct rs_rate
*rate
, enum ieee80211_band band
)
1988 int index
= rate
->index
;
1989 bool cam
= (iwlmvm_mod_params
.power_scheme
== IWL_POWER_SCHEME_CAM
);
1990 bool sta_ps_disabled
= (vif
->type
== NL80211_IFTYPE_STATION
&&
1993 IWL_DEBUG_RATE(mvm
, "cam: %d sta_ps_disabled %d\n",
1994 cam
, sta_ps_disabled
);
1996 * allow tpc only if power management is enabled, or bt coex
1997 * activity grade allows it and we are on 2.4Ghz.
1999 if ((cam
|| sta_ps_disabled
) &&
2000 !iwl_mvm_bt_coex_is_tpc_allowed(mvm
, band
))
2003 IWL_DEBUG_RATE(mvm
, "check rate, table type: %d\n", rate
->type
);
2004 if (is_legacy(rate
))
2005 return index
== IWL_RATE_54M_INDEX
;
2007 return index
== IWL_RATE_MCS_7_INDEX
;
2009 return index
== IWL_RATE_MCS_7_INDEX
||
2010 index
== IWL_RATE_MCS_8_INDEX
||
2011 index
== IWL_RATE_MCS_9_INDEX
;
2019 TPC_ACTION_DECREASE
,
2020 TPC_ACTION_INCREASE
,
2021 TPC_ACTION_NO_RESTIRCTION
,
2024 static enum tpc_action
rs_get_tpc_action(struct iwl_mvm
*mvm
,
2025 s32 sr
, int weak
, int strong
,
2027 int weak_tpt
, int strong_tpt
)
2029 /* stay until we have valid tpt */
2030 if (current_tpt
== IWL_INVALID_VALUE
) {
2031 IWL_DEBUG_RATE(mvm
, "no current tpt. stay.\n");
2032 return TPC_ACTION_STAY
;
2035 /* Too many failures, increase txp */
2036 if (sr
<= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE
) ||
2038 IWL_DEBUG_RATE(mvm
, "increase txp because of weak SR\n");
2039 return TPC_ACTION_NO_RESTIRCTION
;
2042 /* try decreasing first if applicable */
2043 if (weak
!= TPC_INVALID
) {
2044 if (weak_tpt
== IWL_INVALID_VALUE
&&
2045 (strong_tpt
== IWL_INVALID_VALUE
||
2046 current_tpt
>= strong_tpt
)) {
2048 "no weak txp measurement. decrease txp\n");
2049 return TPC_ACTION_DECREASE
;
2052 if (weak_tpt
> current_tpt
) {
2054 "lower txp has better tpt. decrease txp\n");
2055 return TPC_ACTION_DECREASE
;
2059 /* next, increase if needed */
2060 if (sr
< RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE
) &&
2061 strong
!= TPC_INVALID
) {
2062 if (weak_tpt
== IWL_INVALID_VALUE
&&
2063 strong_tpt
!= IWL_INVALID_VALUE
&&
2064 current_tpt
< strong_tpt
) {
2066 "higher txp has better tpt. increase txp\n");
2067 return TPC_ACTION_INCREASE
;
2070 if (weak_tpt
< current_tpt
&&
2071 (strong_tpt
== IWL_INVALID_VALUE
||
2072 strong_tpt
> current_tpt
)) {
2074 "lower txp has worse tpt. increase txp\n");
2075 return TPC_ACTION_INCREASE
;
2079 IWL_DEBUG_RATE(mvm
, "no need to increase or decrease txp - stay\n");
2080 return TPC_ACTION_STAY
;
2083 static bool rs_tpc_perform(struct iwl_mvm
*mvm
,
2084 struct ieee80211_sta
*sta
,
2085 struct iwl_lq_sta
*lq_sta
,
2086 struct iwl_scale_tbl_info
*tbl
)
2088 struct iwl_mvm_sta
*mvm_sta
= iwl_mvm_sta_from_mac80211(sta
);
2089 struct ieee80211_vif
*vif
= mvm_sta
->vif
;
2090 struct ieee80211_chanctx_conf
*chanctx_conf
;
2091 enum ieee80211_band band
;
2092 struct iwl_rate_scale_data
*window
;
2093 struct rs_rate
*rate
= &tbl
->rate
;
2094 enum tpc_action action
;
2096 u8 cur
= lq_sta
->lq
.reduced_tpc
;
2099 int weak_tpt
= IWL_INVALID_VALUE
, strong_tpt
= IWL_INVALID_VALUE
;
2101 #ifdef CONFIG_MAC80211_DEBUGFS
2102 if (lq_sta
->pers
.dbg_fixed_txp_reduction
<= TPC_MAX_REDUCTION
) {
2103 IWL_DEBUG_RATE(mvm
, "fixed tpc: %d\n",
2104 lq_sta
->pers
.dbg_fixed_txp_reduction
);
2105 lq_sta
->lq
.reduced_tpc
= lq_sta
->pers
.dbg_fixed_txp_reduction
;
2106 return cur
!= lq_sta
->pers
.dbg_fixed_txp_reduction
;
2111 chanctx_conf
= rcu_dereference(vif
->chanctx_conf
);
2112 if (WARN_ON(!chanctx_conf
))
2113 band
= IEEE80211_NUM_BANDS
;
2115 band
= chanctx_conf
->def
.chan
->band
;
2118 if (!rs_tpc_allowed(mvm
, vif
, rate
, band
)) {
2120 "tpc is not allowed. remove txp restrictions\n");
2121 lq_sta
->lq
.reduced_tpc
= TPC_NO_REDUCTION
;
2122 return cur
!= TPC_NO_REDUCTION
;
2125 rs_get_adjacent_txp(mvm
, cur
, &weak
, &strong
);
2127 /* Collect measured throughputs for current and adjacent rates */
2128 window
= tbl
->tpc_win
;
2129 sr
= window
[cur
].success_ratio
;
2130 current_tpt
= window
[cur
].average_tpt
;
2131 if (weak
!= TPC_INVALID
)
2132 weak_tpt
= window
[weak
].average_tpt
;
2133 if (strong
!= TPC_INVALID
)
2134 strong_tpt
= window
[strong
].average_tpt
;
2137 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2138 cur
, current_tpt
, sr
, weak
, strong
,
2139 weak_tpt
, strong_tpt
);
2141 action
= rs_get_tpc_action(mvm
, sr
, weak
, strong
,
2142 current_tpt
, weak_tpt
, strong_tpt
);
2144 /* override actions if we are on the edge */
2145 if (weak
== TPC_INVALID
&& action
== TPC_ACTION_DECREASE
) {
2146 IWL_DEBUG_RATE(mvm
, "already in lowest txp, stay\n");
2147 action
= TPC_ACTION_STAY
;
2148 } else if (strong
== TPC_INVALID
&&
2149 (action
== TPC_ACTION_INCREASE
||
2150 action
== TPC_ACTION_NO_RESTIRCTION
)) {
2151 IWL_DEBUG_RATE(mvm
, "already in highest txp, stay\n");
2152 action
= TPC_ACTION_STAY
;
2156 case TPC_ACTION_DECREASE
:
2157 lq_sta
->lq
.reduced_tpc
= weak
;
2159 case TPC_ACTION_INCREASE
:
2160 lq_sta
->lq
.reduced_tpc
= strong
;
2162 case TPC_ACTION_NO_RESTIRCTION
:
2163 lq_sta
->lq
.reduced_tpc
= TPC_NO_REDUCTION
;
2165 case TPC_ACTION_STAY
:
2173 * Do rate scaling and search for new modulation mode.
2175 static void rs_rate_scale_perform(struct iwl_mvm
*mvm
,
2176 struct ieee80211_sta
*sta
,
2177 struct iwl_lq_sta
*lq_sta
,
2180 int low
= IWL_RATE_INVALID
;
2181 int high
= IWL_RATE_INVALID
;
2183 struct iwl_rate_scale_data
*window
= NULL
;
2184 int current_tpt
= IWL_INVALID_VALUE
;
2185 int low_tpt
= IWL_INVALID_VALUE
;
2186 int high_tpt
= IWL_INVALID_VALUE
;
2188 enum rs_action scale_action
= RS_ACTION_STAY
;
2191 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
2196 u8 prev_agg
= lq_sta
->is_agg
;
2197 struct iwl_mvm_sta
*sta_priv
= iwl_mvm_sta_from_mac80211(sta
);
2198 struct iwl_mvm_tid_data
*tid_data
;
2199 struct rs_rate
*rate
;
2201 lq_sta
->is_agg
= !!sta_priv
->agg_tids
;
2204 * Select rate-scale / modulation-mode table to work with in
2205 * the rest of this function: "search" if searching for better
2206 * modulation mode, or "active" if doing rate scaling within a mode.
2208 if (!lq_sta
->search_better_tbl
)
2209 active_tbl
= lq_sta
->active_tbl
;
2211 active_tbl
= 1 - lq_sta
->active_tbl
;
2213 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2216 if (prev_agg
!= lq_sta
->is_agg
) {
2218 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2219 prev_agg
, lq_sta
->is_agg
);
2220 rs_set_expected_tpt_table(lq_sta
, tbl
);
2221 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
2224 /* current tx rate */
2225 index
= rate
->index
;
2227 /* rates available for this association, and for modulation mode */
2228 rate_mask
= rs_get_supported_rates(lq_sta
, rate
);
2230 if (!(BIT(index
) & rate_mask
)) {
2231 IWL_ERR(mvm
, "Current Rate is not valid\n");
2232 if (lq_sta
->search_better_tbl
) {
2233 /* revert to active table if search table is not valid*/
2234 rate
->type
= LQ_NONE
;
2235 lq_sta
->search_better_tbl
= 0;
2236 tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2237 rs_update_rate_tbl(mvm
, sta
, lq_sta
, tbl
);
2242 /* Get expected throughput table and history window for current rate */
2243 if (!tbl
->expected_tpt
) {
2244 IWL_ERR(mvm
, "tbl->expected_tpt is NULL\n");
2248 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2249 window
= &(tbl
->win
[index
]);
2252 * If there is not enough history to calculate actual average
2253 * throughput, keep analyzing results of more tx frames, without
2254 * changing rate or mode (bypass most of the rest of this function).
2255 * Set up new rate table in uCode only if old rate is not supported
2256 * in current association (use new rate found above).
2258 fail_count
= window
->counter
- window
->success_counter
;
2259 if ((fail_count
< IWL_MVM_RS_RATE_MIN_FAILURE_TH
) &&
2260 (window
->success_counter
< IWL_MVM_RS_RATE_MIN_SUCCESS_TH
)) {
2262 "%s: Test Window: succ %d total %d\n",
2263 rs_pretty_rate(rate
),
2264 window
->success_counter
, window
->counter
);
2266 /* Can't calculate this yet; not enough history */
2267 window
->average_tpt
= IWL_INVALID_VALUE
;
2269 /* Should we stay with this modulation mode,
2270 * or search for a new one? */
2271 rs_stay_in_table(lq_sta
, false);
2276 /* If we are searching for better modulation mode, check success. */
2277 if (lq_sta
->search_better_tbl
) {
2278 /* If good success, continue using the "search" mode;
2279 * no need to send new link quality command, since we're
2280 * continuing to use the setup that we've been trying. */
2281 if (window
->average_tpt
> lq_sta
->last_tpt
) {
2283 "SWITCHING TO NEW TABLE SR: %d "
2284 "cur-tpt %d old-tpt %d\n",
2285 window
->success_ratio
,
2286 window
->average_tpt
,
2289 /* Swap tables; "search" becomes "active" */
2290 lq_sta
->active_tbl
= active_tbl
;
2291 current_tpt
= window
->average_tpt
;
2292 /* Else poor success; go back to mode in "active" table */
2295 "GOING BACK TO THE OLD TABLE: SR %d "
2296 "cur-tpt %d old-tpt %d\n",
2297 window
->success_ratio
,
2298 window
->average_tpt
,
2301 /* Nullify "search" table */
2302 rate
->type
= LQ_NONE
;
2304 /* Revert to "active" table */
2305 active_tbl
= lq_sta
->active_tbl
;
2306 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2308 /* Revert to "active" rate and throughput info */
2309 index
= tbl
->rate
.index
;
2310 current_tpt
= lq_sta
->last_tpt
;
2312 /* Need to set up a new rate table in uCode */
2316 /* Either way, we've made a decision; modulation mode
2317 * search is done, allow rate adjustment next time. */
2318 lq_sta
->search_better_tbl
= 0;
2319 done_search
= 1; /* Don't switch modes below! */
2323 /* (Else) not in search of better modulation mode, try for better
2324 * starting rate, while staying in this mode. */
2325 high_low
= rs_get_adjacent_rate(mvm
, index
, rate_mask
, rate
->type
);
2326 low
= high_low
& 0xff;
2327 high
= (high_low
>> 8) & 0xff;
2329 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2331 sr
= window
->success_ratio
;
2333 /* Collect measured throughputs for current and adjacent rates */
2334 current_tpt
= window
->average_tpt
;
2335 if (low
!= IWL_RATE_INVALID
)
2336 low_tpt
= tbl
->win
[low
].average_tpt
;
2337 if (high
!= IWL_RATE_INVALID
)
2338 high_tpt
= tbl
->win
[high
].average_tpt
;
2341 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2342 rs_pretty_rate(rate
), current_tpt
, sr
,
2343 low
, high
, low_tpt
, high_tpt
);
2345 scale_action
= rs_get_rate_action(mvm
, tbl
, sr
, low
, high
,
2346 current_tpt
, low_tpt
, high_tpt
);
2348 /* Force a search in case BT doesn't like us being in MIMO */
2349 if (is_mimo(rate
) &&
2350 !iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
)) {
2352 "BT Coex forbids MIMO. Search for new config\n");
2353 rs_stay_in_table(lq_sta
, true);
2357 switch (scale_action
) {
2358 case RS_ACTION_DOWNSCALE
:
2359 /* Decrease starting rate, update uCode's rate table */
2360 if (low
!= IWL_RATE_INVALID
) {
2365 "At the bottom rate. Can't decrease\n");
2369 case RS_ACTION_UPSCALE
:
2370 /* Increase starting rate, update uCode's rate table */
2371 if (high
!= IWL_RATE_INVALID
) {
2376 "At the top rate. Can't increase\n");
2380 case RS_ACTION_STAY
:
2382 if (lq_sta
->rs_state
== RS_STATE_STAY_IN_COLUMN
)
2383 update_lq
= rs_tpc_perform(mvm
, sta
, lq_sta
, tbl
);
2390 /* Replace uCode's rate table for the destination station. */
2392 tbl
->rate
.index
= index
;
2393 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK
)
2394 rs_tweak_rate_tbl(mvm
, sta
, lq_sta
, tbl
, scale_action
);
2395 rs_update_rate_tbl(mvm
, sta
, lq_sta
, tbl
);
2398 rs_stay_in_table(lq_sta
, false);
2401 * Search for new modulation mode if we're:
2402 * 1) Not changing rates right now
2403 * 2) Not just finishing up a search
2404 * 3) Allowing a new search
2406 if (!update_lq
&& !done_search
&&
2407 lq_sta
->rs_state
== RS_STATE_SEARCH_CYCLE_STARTED
2408 && window
->counter
) {
2409 enum rs_column next_column
;
2411 /* Save current throughput to compare with "search" throughput*/
2412 lq_sta
->last_tpt
= current_tpt
;
2415 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2416 update_lq
, done_search
, lq_sta
->rs_state
,
2419 next_column
= rs_get_next_column(mvm
, lq_sta
, sta
, tbl
);
2420 if (next_column
!= RS_COLUMN_INVALID
) {
2421 int ret
= rs_switch_to_column(mvm
, lq_sta
, sta
,
2424 lq_sta
->search_better_tbl
= 1;
2427 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2428 lq_sta
->rs_state
= RS_STATE_SEARCH_CYCLE_ENDED
;
2431 /* If new "search" mode was selected, set up in uCode table */
2432 if (lq_sta
->search_better_tbl
) {
2433 /* Access the "search" table, clear its history. */
2434 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2435 rs_rate_scale_clear_tbl_windows(mvm
, tbl
);
2437 /* Use new "search" start rate */
2438 index
= tbl
->rate
.index
;
2440 rs_dump_rate(mvm
, &tbl
->rate
,
2441 "Switch to SEARCH TABLE:");
2442 rs_update_rate_tbl(mvm
, sta
, lq_sta
, tbl
);
2448 if (done_search
&& lq_sta
->rs_state
== RS_STATE_SEARCH_CYCLE_ENDED
) {
2449 /* If the "active" (non-search) mode was legacy,
2450 * and we've tried switching antennas,
2451 * but we haven't been able to try HT modes (not available),
2452 * stay with best antenna legacy modulation for a while
2453 * before next round of mode comparisons. */
2454 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2455 if (is_legacy(&tbl1
->rate
)) {
2456 IWL_DEBUG_RATE(mvm
, "LQ: STAY in legacy table\n");
2458 if (tid
!= IWL_MAX_TID_COUNT
) {
2459 tid_data
= &sta_priv
->tid_data
[tid
];
2460 if (tid_data
->state
!= IWL_AGG_OFF
) {
2462 "Stop aggregation on tid %d\n",
2464 ieee80211_stop_tx_ba_session(sta
, tid
);
2467 rs_set_stay_in_table(mvm
, 1, lq_sta
);
2469 /* If we're in an HT mode, and all 3 mode switch actions
2470 * have been tried and compared, stay in this best modulation
2471 * mode for a while before next round of mode comparisons. */
2472 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2473 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2474 (tid
!= IWL_MAX_TID_COUNT
)) {
2475 tid_data
= &sta_priv
->tid_data
[tid
];
2476 if (tid_data
->state
== IWL_AGG_OFF
) {
2478 "try to aggregate tid %d\n",
2480 rs_tl_turn_on_agg(mvm
, tid
,
2484 rs_set_stay_in_table(mvm
, 0, lq_sta
);
2489 struct rs_init_rate_info
{
2494 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy
[] = {
2495 { -60, IWL_RATE_54M_INDEX
},
2496 { -64, IWL_RATE_48M_INDEX
},
2497 { -68, IWL_RATE_36M_INDEX
},
2498 { -80, IWL_RATE_24M_INDEX
},
2499 { -84, IWL_RATE_18M_INDEX
},
2500 { -85, IWL_RATE_12M_INDEX
},
2501 { -86, IWL_RATE_11M_INDEX
},
2502 { -88, IWL_RATE_5M_INDEX
},
2503 { -90, IWL_RATE_2M_INDEX
},
2504 { S8_MIN
, IWL_RATE_1M_INDEX
},
2507 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy
[] = {
2508 { -60, IWL_RATE_54M_INDEX
},
2509 { -64, IWL_RATE_48M_INDEX
},
2510 { -72, IWL_RATE_36M_INDEX
},
2511 { -80, IWL_RATE_24M_INDEX
},
2512 { -84, IWL_RATE_18M_INDEX
},
2513 { -85, IWL_RATE_12M_INDEX
},
2514 { -87, IWL_RATE_9M_INDEX
},
2515 { S8_MIN
, IWL_RATE_6M_INDEX
},
2518 static const struct rs_init_rate_info rs_optimal_rates_ht
[] = {
2519 { -60, IWL_RATE_MCS_7_INDEX
},
2520 { -64, IWL_RATE_MCS_6_INDEX
},
2521 { -68, IWL_RATE_MCS_5_INDEX
},
2522 { -72, IWL_RATE_MCS_4_INDEX
},
2523 { -80, IWL_RATE_MCS_3_INDEX
},
2524 { -84, IWL_RATE_MCS_2_INDEX
},
2525 { -85, IWL_RATE_MCS_1_INDEX
},
2526 { S8_MIN
, IWL_RATE_MCS_0_INDEX
},
2529 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz
[] = {
2530 { -60, IWL_RATE_MCS_8_INDEX
},
2531 { -64, IWL_RATE_MCS_7_INDEX
},
2532 { -68, IWL_RATE_MCS_6_INDEX
},
2533 { -72, IWL_RATE_MCS_5_INDEX
},
2534 { -80, IWL_RATE_MCS_4_INDEX
},
2535 { -84, IWL_RATE_MCS_3_INDEX
},
2536 { -85, IWL_RATE_MCS_2_INDEX
},
2537 { -87, IWL_RATE_MCS_1_INDEX
},
2538 { S8_MIN
, IWL_RATE_MCS_0_INDEX
},
2541 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz
[] = {
2542 { -60, IWL_RATE_MCS_9_INDEX
},
2543 { -64, IWL_RATE_MCS_8_INDEX
},
2544 { -68, IWL_RATE_MCS_7_INDEX
},
2545 { -72, IWL_RATE_MCS_6_INDEX
},
2546 { -80, IWL_RATE_MCS_5_INDEX
},
2547 { -84, IWL_RATE_MCS_4_INDEX
},
2548 { -85, IWL_RATE_MCS_3_INDEX
},
2549 { -87, IWL_RATE_MCS_2_INDEX
},
2550 { -88, IWL_RATE_MCS_1_INDEX
},
2551 { S8_MIN
, IWL_RATE_MCS_0_INDEX
},
2554 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2556 /* Init the optimal rate based on STA caps
2557 * This combined with rssi is used to report the last tx rate
2558 * to userspace when we haven't transmitted enough frames.
2560 static void rs_init_optimal_rate(struct iwl_mvm
*mvm
,
2561 struct ieee80211_sta
*sta
,
2562 struct iwl_lq_sta
*lq_sta
)
2564 struct rs_rate
*rate
= &lq_sta
->optimal_rate
;
2566 if (lq_sta
->max_mimo2_rate_idx
!= IWL_RATE_INVALID
)
2567 rate
->type
= lq_sta
->is_vht
? LQ_VHT_MIMO2
: LQ_HT_MIMO2
;
2568 else if (lq_sta
->max_siso_rate_idx
!= IWL_RATE_INVALID
)
2569 rate
->type
= lq_sta
->is_vht
? LQ_VHT_SISO
: LQ_HT_SISO
;
2570 else if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2571 rate
->type
= LQ_LEGACY_A
;
2573 rate
->type
= LQ_LEGACY_G
;
2575 rate
->bw
= rs_bw_from_sta_bw(sta
);
2576 rate
->sgi
= rs_sgi_allow(mvm
, sta
, rate
, NULL
);
2578 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2580 if (is_mimo(rate
)) {
2581 lq_sta
->optimal_rate_mask
= lq_sta
->active_mimo2_rate
;
2582 } else if (is_siso(rate
)) {
2583 lq_sta
->optimal_rate_mask
= lq_sta
->active_siso_rate
;
2585 lq_sta
->optimal_rate_mask
= lq_sta
->active_legacy_rate
;
2587 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
) {
2588 lq_sta
->optimal_rates
= rs_optimal_rates_5ghz_legacy
;
2589 lq_sta
->optimal_nentries
=
2590 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy
);
2592 lq_sta
->optimal_rates
= rs_optimal_rates_24ghz_legacy
;
2593 lq_sta
->optimal_nentries
=
2594 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy
);
2599 if (rate
->bw
== RATE_MCS_CHAN_WIDTH_20
) {
2600 lq_sta
->optimal_rates
= rs_optimal_rates_vht_20mhz
;
2601 lq_sta
->optimal_nentries
=
2602 ARRAY_SIZE(rs_optimal_rates_vht_20mhz
);
2604 lq_sta
->optimal_rates
= rs_optimal_rates_vht_40_80mhz
;
2605 lq_sta
->optimal_nentries
=
2606 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz
);
2608 } else if (is_ht(rate
)) {
2609 lq_sta
->optimal_rates
= rs_optimal_rates_ht
;
2610 lq_sta
->optimal_nentries
= ARRAY_SIZE(rs_optimal_rates_ht
);
2614 /* Compute the optimal rate index based on RSSI */
2615 static struct rs_rate
*rs_get_optimal_rate(struct iwl_mvm
*mvm
,
2616 struct iwl_lq_sta
*lq_sta
)
2618 struct rs_rate
*rate
= &lq_sta
->optimal_rate
;
2621 rate
->index
= find_first_bit(&lq_sta
->optimal_rate_mask
,
2624 for (i
= 0; i
< lq_sta
->optimal_nentries
; i
++) {
2625 int rate_idx
= lq_sta
->optimal_rates
[i
].rate_idx
;
2627 if ((lq_sta
->pers
.last_rssi
>= lq_sta
->optimal_rates
[i
].rssi
) &&
2628 (BIT(rate_idx
) & lq_sta
->optimal_rate_mask
)) {
2629 rate
->index
= rate_idx
;
2637 /* Choose an initial legacy rate and antenna to use based on the RSSI
2640 static void rs_get_initial_rate(struct iwl_mvm
*mvm
,
2641 struct ieee80211_sta
*sta
,
2642 struct iwl_lq_sta
*lq_sta
,
2643 enum ieee80211_band band
,
2644 struct rs_rate
*rate
)
2647 unsigned long active_rate
;
2648 s8 best_rssi
= S8_MIN
;
2649 u8 best_ant
= ANT_NONE
;
2650 u8 valid_tx_ant
= iwl_mvm_get_valid_tx_ant(mvm
);
2651 const struct rs_init_rate_info
*initial_rates
;
2653 for (i
= 0; i
< ARRAY_SIZE(lq_sta
->pers
.chain_signal
); i
++) {
2654 if (!(lq_sta
->pers
.chains
& BIT(i
)))
2657 if (lq_sta
->pers
.chain_signal
[i
] > best_rssi
) {
2658 best_rssi
= lq_sta
->pers
.chain_signal
[i
];
2663 IWL_DEBUG_RATE(mvm
, "Best ANT: %s Best RSSI: %d\n",
2664 rs_pretty_ant(best_ant
), best_rssi
);
2666 if (best_ant
!= ANT_A
&& best_ant
!= ANT_B
)
2667 rate
->ant
= first_antenna(valid_tx_ant
);
2669 rate
->ant
= best_ant
;
2673 rate
->bw
= RATE_MCS_CHAN_WIDTH_20
;
2675 rate
->index
= find_first_bit(&lq_sta
->active_legacy_rate
,
2678 if (band
== IEEE80211_BAND_5GHZ
) {
2679 rate
->type
= LQ_LEGACY_A
;
2680 initial_rates
= rs_optimal_rates_5ghz_legacy
;
2681 nentries
= ARRAY_SIZE(rs_optimal_rates_5ghz_legacy
);
2683 rate
->type
= LQ_LEGACY_G
;
2684 initial_rates
= rs_optimal_rates_24ghz_legacy
;
2685 nentries
= ARRAY_SIZE(rs_optimal_rates_24ghz_legacy
);
2688 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE
)
2691 /* Start from a higher rate if the corresponding debug capability
2692 * is enabled. The rate is chosen according to AP capabilities.
2693 * In case of VHT/HT when the rssi is low fallback to the case of
2696 if (sta
->vht_cap
.vht_supported
&&
2697 best_rssi
> IWL_RS_LOW_RSSI_THRESHOLD
) {
2698 if (sta
->bandwidth
>= IEEE80211_STA_RX_BW_40
) {
2699 initial_rates
= rs_optimal_rates_vht_40_80mhz
;
2700 nentries
= ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz
);
2701 if (sta
->bandwidth
>= IEEE80211_STA_RX_BW_80
)
2702 rate
->bw
= RATE_MCS_CHAN_WIDTH_80
;
2704 rate
->bw
= RATE_MCS_CHAN_WIDTH_40
;
2705 } else if (sta
->bandwidth
== IEEE80211_STA_RX_BW_20
) {
2706 initial_rates
= rs_optimal_rates_vht_20mhz
;
2707 nentries
= ARRAY_SIZE(rs_optimal_rates_vht_20mhz
);
2708 rate
->bw
= RATE_MCS_CHAN_WIDTH_20
;
2710 IWL_ERR(mvm
, "Invalid BW %d\n", sta
->bandwidth
);
2713 active_rate
= lq_sta
->active_siso_rate
;
2714 rate
->type
= LQ_VHT_SISO
;
2715 } else if (sta
->ht_cap
.ht_supported
&&
2716 best_rssi
> IWL_RS_LOW_RSSI_THRESHOLD
) {
2717 initial_rates
= rs_optimal_rates_ht
;
2718 nentries
= ARRAY_SIZE(rs_optimal_rates_ht
);
2719 active_rate
= lq_sta
->active_siso_rate
;
2720 rate
->type
= LQ_HT_SISO
;
2722 active_rate
= lq_sta
->active_legacy_rate
;
2725 for (i
= 0; i
< nentries
; i
++) {
2726 int rate_idx
= initial_rates
[i
].rate_idx
;
2728 if ((best_rssi
>= initial_rates
[i
].rssi
) &&
2729 (BIT(rate_idx
) & active_rate
)) {
2730 rate
->index
= rate_idx
;
2736 rs_dump_rate(mvm
, rate
, "INITIAL");
2739 /* Save info about RSSI of last Rx */
2740 void rs_update_last_rssi(struct iwl_mvm
*mvm
,
2741 struct iwl_lq_sta
*lq_sta
,
2742 struct ieee80211_rx_status
*rx_status
)
2746 lq_sta
->pers
.chains
= rx_status
->chains
;
2747 lq_sta
->pers
.chain_signal
[0] = rx_status
->chain_signal
[0];
2748 lq_sta
->pers
.chain_signal
[1] = rx_status
->chain_signal
[1];
2749 lq_sta
->pers
.chain_signal
[2] = rx_status
->chain_signal
[2];
2750 lq_sta
->pers
.last_rssi
= S8_MIN
;
2752 for (i
= 0; i
< ARRAY_SIZE(lq_sta
->pers
.chain_signal
); i
++) {
2753 if (!(lq_sta
->pers
.chains
& BIT(i
)))
2756 if (lq_sta
->pers
.chain_signal
[i
] > lq_sta
->pers
.last_rssi
)
2757 lq_sta
->pers
.last_rssi
= lq_sta
->pers
.chain_signal
[i
];
2762 * rs_initialize_lq - Initialize a station's hardware rate table
2764 * The uCode's station table contains a table of fallback rates
2765 * for automatic fallback during transmission.
2767 * NOTE: This sets up a default set of values. These will be replaced later
2768 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2771 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2772 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2773 * which requires station table entry to exist).
2775 static void rs_initialize_lq(struct iwl_mvm
*mvm
,
2776 struct ieee80211_sta
*sta
,
2777 struct iwl_lq_sta
*lq_sta
,
2778 enum ieee80211_band band
,
2781 struct iwl_scale_tbl_info
*tbl
;
2782 struct rs_rate
*rate
;
2785 if (!sta
|| !lq_sta
)
2788 if (!lq_sta
->search_better_tbl
)
2789 active_tbl
= lq_sta
->active_tbl
;
2791 active_tbl
= 1 - lq_sta
->active_tbl
;
2793 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2796 rs_get_initial_rate(mvm
, sta
, lq_sta
, band
, rate
);
2797 rs_init_optimal_rate(mvm
, sta
, lq_sta
);
2799 WARN_ON_ONCE(rate
->ant
!= ANT_A
&& rate
->ant
!= ANT_B
);
2800 tbl
->column
= rs_get_column_from_rate(rate
);
2802 rs_set_expected_tpt_table(lq_sta
, tbl
);
2803 rs_fill_lq_cmd(mvm
, sta
, lq_sta
, rate
);
2804 /* TODO restore station should remember the lq cmd */
2805 iwl_mvm_send_lq_cmd(mvm
, &lq_sta
->lq
, init
);
2808 static void rs_get_rate(void *mvm_r
, struct ieee80211_sta
*sta
, void *mvm_sta
,
2809 struct ieee80211_tx_rate_control
*txrc
)
2811 struct sk_buff
*skb
= txrc
->skb
;
2812 struct iwl_op_mode
*op_mode __maybe_unused
=
2813 (struct iwl_op_mode
*)mvm_r
;
2814 struct iwl_mvm
*mvm __maybe_unused
= IWL_OP_MODE_GET_MVM(op_mode
);
2815 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2816 struct iwl_lq_sta
*lq_sta
= mvm_sta
;
2817 struct rs_rate
*optimal_rate
;
2818 u32 last_ucode_rate
;
2820 if (sta
&& !iwl_mvm_sta_from_mac80211(sta
)->vif
) {
2821 /* if vif isn't initialized mvm doesn't know about
2822 * this station, so don't do anything with the it
2828 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2830 /* Treat uninitialized rate scaling data same as non-existing. */
2831 if (lq_sta
&& !lq_sta
->pers
.drv
) {
2832 IWL_DEBUG_RATE(mvm
, "Rate scaling not initialized yet.\n");
2836 /* Send management frames and NO_ACK data using lowest rate. */
2837 if (rate_control_send_low(sta
, mvm_sta
, txrc
))
2840 iwl_mvm_hwrate_to_tx_rate(lq_sta
->last_rate_n_flags
,
2841 info
->band
, &info
->control
.rates
[0]);
2842 info
->control
.rates
[0].count
= 1;
2844 /* Report the optimal rate based on rssi and STA caps if we haven't
2845 * converged yet (too little traffic) or exploring other modulations
2847 if (lq_sta
->rs_state
!= RS_STATE_STAY_IN_COLUMN
) {
2848 optimal_rate
= rs_get_optimal_rate(mvm
, lq_sta
);
2849 last_ucode_rate
= ucode_rate_from_rs_rate(mvm
,
2851 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate
, info
->band
,
2852 &txrc
->reported_rate
);
2856 static void *rs_alloc_sta(void *mvm_rate
, struct ieee80211_sta
*sta
,
2859 struct iwl_mvm_sta
*sta_priv
= iwl_mvm_sta_from_mac80211(sta
);
2860 struct iwl_op_mode
*op_mode
= (struct iwl_op_mode
*)mvm_rate
;
2861 struct iwl_mvm
*mvm
= IWL_OP_MODE_GET_MVM(op_mode
);
2862 struct iwl_lq_sta
*lq_sta
= &sta_priv
->lq_sta
;
2864 IWL_DEBUG_RATE(mvm
, "create station rate scale window\n");
2866 lq_sta
->pers
.drv
= mvm
;
2867 #ifdef CONFIG_MAC80211_DEBUGFS
2868 lq_sta
->pers
.dbg_fixed_rate
= 0;
2869 lq_sta
->pers
.dbg_fixed_txp_reduction
= TPC_INVALID
;
2870 lq_sta
->pers
.ss_force
= RS_SS_FORCE_NONE
;
2872 lq_sta
->pers
.chains
= 0;
2873 memset(lq_sta
->pers
.chain_signal
, 0, sizeof(lq_sta
->pers
.chain_signal
));
2874 lq_sta
->pers
.last_rssi
= S8_MIN
;
2876 return &sta_priv
->lq_sta
;
2879 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap
*vht_cap
,
2882 u16 rx_mcs
= le16_to_cpu(vht_cap
->vht_mcs
.rx_mcs_map
) &
2883 (0x3 << (2 * (nss
- 1)));
2884 rx_mcs
>>= (2 * (nss
- 1));
2886 if (rx_mcs
== IEEE80211_VHT_MCS_SUPPORT_0_7
)
2887 return IWL_RATE_MCS_7_INDEX
;
2888 else if (rx_mcs
== IEEE80211_VHT_MCS_SUPPORT_0_8
)
2889 return IWL_RATE_MCS_8_INDEX
;
2890 else if (rx_mcs
== IEEE80211_VHT_MCS_SUPPORT_0_9
)
2891 return IWL_RATE_MCS_9_INDEX
;
2893 WARN_ON_ONCE(rx_mcs
!= IEEE80211_VHT_MCS_NOT_SUPPORTED
);
2897 static void rs_vht_set_enabled_rates(struct ieee80211_sta
*sta
,
2898 struct ieee80211_sta_vht_cap
*vht_cap
,
2899 struct iwl_lq_sta
*lq_sta
)
2902 int highest_mcs
= rs_vht_highest_rx_mcs_index(vht_cap
, 1);
2904 if (highest_mcs
>= IWL_RATE_MCS_0_INDEX
) {
2905 for (i
= IWL_RATE_MCS_0_INDEX
; i
<= highest_mcs
; i
++) {
2906 if (i
== IWL_RATE_9M_INDEX
)
2909 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2910 if (i
== IWL_RATE_MCS_9_INDEX
&&
2911 sta
->bandwidth
== IEEE80211_STA_RX_BW_20
)
2914 lq_sta
->active_siso_rate
|= BIT(i
);
2918 if (sta
->rx_nss
< 2)
2921 highest_mcs
= rs_vht_highest_rx_mcs_index(vht_cap
, 2);
2922 if (highest_mcs
>= IWL_RATE_MCS_0_INDEX
) {
2923 for (i
= IWL_RATE_MCS_0_INDEX
; i
<= highest_mcs
; i
++) {
2924 if (i
== IWL_RATE_9M_INDEX
)
2927 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2928 if (i
== IWL_RATE_MCS_9_INDEX
&&
2929 sta
->bandwidth
== IEEE80211_STA_RX_BW_20
)
2932 lq_sta
->active_mimo2_rate
|= BIT(i
);
2937 static void rs_ht_init(struct iwl_mvm
*mvm
,
2938 struct ieee80211_sta
*sta
,
2939 struct iwl_lq_sta
*lq_sta
,
2940 struct ieee80211_sta_ht_cap
*ht_cap
)
2942 /* active_siso_rate mask includes 9 MBits (bit 5),
2943 * and CCK (bits 0-3), supp_rates[] does not;
2944 * shift to convert format, force 9 MBits off.
2946 lq_sta
->active_siso_rate
= ht_cap
->mcs
.rx_mask
[0] << 1;
2947 lq_sta
->active_siso_rate
|= ht_cap
->mcs
.rx_mask
[0] & 0x1;
2948 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2949 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2951 lq_sta
->active_mimo2_rate
= ht_cap
->mcs
.rx_mask
[1] << 1;
2952 lq_sta
->active_mimo2_rate
|= ht_cap
->mcs
.rx_mask
[1] & 0x1;
2953 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2954 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2956 if (mvm
->cfg
->ht_params
->ldpc
&&
2957 (ht_cap
->cap
& IEEE80211_HT_CAP_LDPC_CODING
))
2958 lq_sta
->ldpc
= true;
2960 if (mvm
->cfg
->ht_params
->stbc
&&
2961 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm
)) > 1) &&
2962 (ht_cap
->cap
& IEEE80211_HT_CAP_RX_STBC
))
2963 lq_sta
->stbc_capable
= true;
2965 lq_sta
->is_vht
= false;
2968 static void rs_vht_init(struct iwl_mvm
*mvm
,
2969 struct ieee80211_sta
*sta
,
2970 struct iwl_lq_sta
*lq_sta
,
2971 struct ieee80211_sta_vht_cap
*vht_cap
)
2973 rs_vht_set_enabled_rates(sta
, vht_cap
, lq_sta
);
2975 if (mvm
->cfg
->ht_params
->ldpc
&&
2976 (vht_cap
->cap
& IEEE80211_VHT_CAP_RXLDPC
))
2977 lq_sta
->ldpc
= true;
2979 if (mvm
->cfg
->ht_params
->stbc
&&
2980 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm
)) > 1) &&
2981 (vht_cap
->cap
& IEEE80211_VHT_CAP_RXSTBC_MASK
))
2982 lq_sta
->stbc_capable
= true;
2984 if (fw_has_capa(&mvm
->fw
->ucode_capa
, IWL_UCODE_TLV_CAPA_BEAMFORMER
) &&
2985 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm
)) > 1) &&
2986 (vht_cap
->cap
& IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE
))
2987 lq_sta
->bfer_capable
= true;
2989 lq_sta
->is_vht
= true;
2992 #ifdef CONFIG_IWLWIFI_DEBUGFS
2993 static void iwl_mvm_reset_frame_stats(struct iwl_mvm
*mvm
)
2995 spin_lock_bh(&mvm
->drv_stats_lock
);
2996 memset(&mvm
->drv_rx_stats
, 0, sizeof(mvm
->drv_rx_stats
));
2997 spin_unlock_bh(&mvm
->drv_stats_lock
);
3000 void iwl_mvm_update_frame_stats(struct iwl_mvm
*mvm
, u32 rate
, bool agg
)
3002 u8 nss
= 0, mcs
= 0;
3004 spin_lock(&mvm
->drv_stats_lock
);
3007 mvm
->drv_rx_stats
.agg_frames
++;
3009 mvm
->drv_rx_stats
.success_frames
++;
3011 switch (rate
& RATE_MCS_CHAN_WIDTH_MSK
) {
3012 case RATE_MCS_CHAN_WIDTH_20
:
3013 mvm
->drv_rx_stats
.bw_20_frames
++;
3015 case RATE_MCS_CHAN_WIDTH_40
:
3016 mvm
->drv_rx_stats
.bw_40_frames
++;
3018 case RATE_MCS_CHAN_WIDTH_80
:
3019 mvm
->drv_rx_stats
.bw_80_frames
++;
3022 WARN_ONCE(1, "bad BW. rate 0x%x", rate
);
3025 if (rate
& RATE_MCS_HT_MSK
) {
3026 mvm
->drv_rx_stats
.ht_frames
++;
3027 mcs
= rate
& RATE_HT_MCS_RATE_CODE_MSK
;
3028 nss
= ((rate
& RATE_HT_MCS_NSS_MSK
) >> RATE_HT_MCS_NSS_POS
) + 1;
3029 } else if (rate
& RATE_MCS_VHT_MSK
) {
3030 mvm
->drv_rx_stats
.vht_frames
++;
3031 mcs
= rate
& RATE_VHT_MCS_RATE_CODE_MSK
;
3032 nss
= ((rate
& RATE_VHT_MCS_NSS_MSK
) >>
3033 RATE_VHT_MCS_NSS_POS
) + 1;
3035 mvm
->drv_rx_stats
.legacy_frames
++;
3039 mvm
->drv_rx_stats
.siso_frames
++;
3041 mvm
->drv_rx_stats
.mimo2_frames
++;
3043 if (rate
& RATE_MCS_SGI_MSK
)
3044 mvm
->drv_rx_stats
.sgi_frames
++;
3046 mvm
->drv_rx_stats
.ngi_frames
++;
3048 mvm
->drv_rx_stats
.last_rates
[mvm
->drv_rx_stats
.last_frame_idx
] = rate
;
3049 mvm
->drv_rx_stats
.last_frame_idx
=
3050 (mvm
->drv_rx_stats
.last_frame_idx
+ 1) %
3051 ARRAY_SIZE(mvm
->drv_rx_stats
.last_rates
);
3053 spin_unlock(&mvm
->drv_stats_lock
);
3058 * Called after adding a new station to initialize rate scaling
3060 void iwl_mvm_rs_rate_init(struct iwl_mvm
*mvm
, struct ieee80211_sta
*sta
,
3061 enum ieee80211_band band
, bool init
)
3064 struct ieee80211_hw
*hw
= mvm
->hw
;
3065 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
3066 struct ieee80211_sta_vht_cap
*vht_cap
= &sta
->vht_cap
;
3067 struct iwl_mvm_sta
*sta_priv
= iwl_mvm_sta_from_mac80211(sta
);
3068 struct iwl_lq_sta
*lq_sta
= &sta_priv
->lq_sta
;
3069 struct ieee80211_supported_band
*sband
;
3070 unsigned long supp
; /* must be unsigned long for for_each_set_bit */
3072 /* clear all non-persistent lq data */
3073 memset(lq_sta
, 0, offsetof(typeof(*lq_sta
), pers
));
3075 sband
= hw
->wiphy
->bands
[band
];
3077 lq_sta
->lq
.sta_id
= sta_priv
->sta_id
;
3079 for (j
= 0; j
< LQ_SIZE
; j
++)
3080 rs_rate_scale_clear_tbl_windows(mvm
, &lq_sta
->lq_info
[j
]);
3082 lq_sta
->flush_timer
= 0;
3083 lq_sta
->last_tx
= jiffies
;
3086 "LQ: *** rate scale station global init for station %d ***\n",
3088 /* TODO: what is a good starting rate for STA? About middle? Maybe not
3089 * the lowest or the highest rate.. Could consider using RSSI from
3090 * previous packets? Need to have IEEE 802.1X auth succeed immediately
3093 lq_sta
->missed_rate_counter
= IWL_MVM_RS_MISSED_RATE_MAX
;
3094 lq_sta
->band
= sband
->band
;
3096 * active legacy rates as per supported rates bitmap
3098 supp
= sta
->supp_rates
[sband
->band
];
3099 lq_sta
->active_legacy_rate
= 0;
3100 for_each_set_bit(i
, &supp
, BITS_PER_LONG
)
3101 lq_sta
->active_legacy_rate
|= BIT(sband
->bitrates
[i
].hw_value
);
3103 /* TODO: should probably account for rx_highest for both HT/VHT */
3104 if (!vht_cap
|| !vht_cap
->vht_supported
)
3105 rs_ht_init(mvm
, sta
, lq_sta
, ht_cap
);
3107 rs_vht_init(mvm
, sta
, lq_sta
, vht_cap
);
3109 lq_sta
->max_legacy_rate_idx
=
3110 rs_get_max_rate_from_mask(lq_sta
->active_legacy_rate
);
3111 lq_sta
->max_siso_rate_idx
=
3112 rs_get_max_rate_from_mask(lq_sta
->active_siso_rate
);
3113 lq_sta
->max_mimo2_rate_idx
=
3114 rs_get_max_rate_from_mask(lq_sta
->active_mimo2_rate
);
3117 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3118 lq_sta
->active_legacy_rate
,
3119 lq_sta
->active_siso_rate
,
3120 lq_sta
->active_mimo2_rate
,
3121 lq_sta
->is_vht
, lq_sta
->ldpc
, lq_sta
->stbc_capable
,
3122 lq_sta
->bfer_capable
);
3123 IWL_DEBUG_RATE(mvm
, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3124 lq_sta
->max_legacy_rate_idx
,
3125 lq_sta
->max_siso_rate_idx
,
3126 lq_sta
->max_mimo2_rate_idx
);
3128 /* These values will be overridden later */
3129 lq_sta
->lq
.single_stream_ant_msk
=
3130 first_antenna(iwl_mvm_get_valid_tx_ant(mvm
));
3131 lq_sta
->lq
.dual_stream_ant_msk
= ANT_AB
;
3133 /* as default allow aggregation for all tids */
3134 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
3136 #ifdef CONFIG_IWLWIFI_DEBUGFS
3137 iwl_mvm_reset_frame_stats(mvm
);
3139 rs_initialize_lq(mvm
, sta
, lq_sta
, band
, init
);
3142 static void rs_rate_update(void *mvm_r
,
3143 struct ieee80211_supported_band
*sband
,
3144 struct cfg80211_chan_def
*chandef
,
3145 struct ieee80211_sta
*sta
, void *priv_sta
,
3149 struct iwl_op_mode
*op_mode
=
3150 (struct iwl_op_mode
*)mvm_r
;
3151 struct iwl_mvm
*mvm
= IWL_OP_MODE_GET_MVM(op_mode
);
3153 if (!iwl_mvm_sta_from_mac80211(sta
)->vif
)
3156 /* Stop any ongoing aggregations as rs starts off assuming no agg */
3157 for (tid
= 0; tid
< IWL_MAX_TID_COUNT
; tid
++)
3158 ieee80211_stop_tx_ba_session(sta
, tid
);
3160 iwl_mvm_rs_rate_init(mvm
, sta
, sband
->band
, false);
3163 #ifdef CONFIG_MAC80211_DEBUGFS
3164 static void rs_build_rates_table_from_fixed(struct iwl_mvm
*mvm
,
3165 struct iwl_lq_cmd
*lq_cmd
,
3166 enum ieee80211_band band
,
3169 struct rs_rate rate
;
3171 int num_rates
= ARRAY_SIZE(lq_cmd
->rs_table
);
3172 __le32 ucode_rate_le32
= cpu_to_le32(ucode_rate
);
3173 u8 ant
= (ucode_rate
& RATE_MCS_ANT_ABC_MSK
) >> RATE_MCS_ANT_POS
;
3175 for (i
= 0; i
< num_rates
; i
++)
3176 lq_cmd
->rs_table
[i
] = ucode_rate_le32
;
3178 rs_rate_from_ucode_rate(ucode_rate
, band
, &rate
);
3181 lq_cmd
->mimo_delim
= num_rates
- 1;
3183 lq_cmd
->mimo_delim
= 0;
3185 lq_cmd
->reduced_tpc
= 0;
3187 if (num_of_ant(ant
) == 1)
3188 lq_cmd
->single_stream_ant_msk
= ant
;
3190 lq_cmd
->agg_frame_cnt_limit
= LINK_QUAL_AGG_FRAME_LIMIT_DEF
;
3192 #endif /* CONFIG_MAC80211_DEBUGFS */
3194 static void rs_fill_rates_for_column(struct iwl_mvm
*mvm
,
3195 struct iwl_lq_sta
*lq_sta
,
3196 struct rs_rate
*rate
,
3197 __le32
*rs_table
, int *rs_table_index
,
3198 int num_rates
, int num_retries
,
3199 u8 valid_tx_ant
, bool toggle_ant
)
3203 bool bottom_reached
= false;
3204 int prev_rate_idx
= rate
->index
;
3205 int end
= LINK_QUAL_MAX_RETRY_NUM
;
3206 int index
= *rs_table_index
;
3208 for (i
= 0; i
< num_rates
&& index
< end
; i
++) {
3209 for (j
= 0; j
< num_retries
&& index
< end
; j
++, index
++) {
3210 ucode_rate
= cpu_to_le32(ucode_rate_from_rs_rate(mvm
,
3212 rs_table
[index
] = ucode_rate
;
3214 rs_toggle_antenna(valid_tx_ant
, rate
);
3217 prev_rate_idx
= rate
->index
;
3218 bottom_reached
= rs_get_lower_rate_in_column(lq_sta
, rate
);
3219 if (bottom_reached
&& !is_legacy(rate
))
3223 if (!bottom_reached
&& !is_legacy(rate
))
3224 rate
->index
= prev_rate_idx
;
3226 *rs_table_index
= index
;
3229 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3230 * column the rate table should look like this:
3232 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3233 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3234 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3235 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3236 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3237 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3238 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3239 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3240 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3241 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3242 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3243 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3244 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3245 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3246 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3247 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3249 static void rs_build_rates_table(struct iwl_mvm
*mvm
,
3250 struct ieee80211_sta
*sta
,
3251 struct iwl_lq_sta
*lq_sta
,
3252 const struct rs_rate
*initial_rate
)
3254 struct rs_rate rate
;
3255 int num_rates
, num_retries
, index
= 0;
3256 u8 valid_tx_ant
= 0;
3257 struct iwl_lq_cmd
*lq_cmd
= &lq_sta
->lq
;
3258 bool toggle_ant
= false;
3260 memcpy(&rate
, initial_rate
, sizeof(rate
));
3262 valid_tx_ant
= iwl_mvm_get_valid_tx_ant(mvm
);
3264 /* TODO: remove old API when min FW API hits 14 */
3265 if (!fw_has_api(&mvm
->fw
->ucode_capa
, IWL_UCODE_TLV_API_LQ_SS_PARAMS
) &&
3266 rs_stbc_allow(mvm
, sta
, lq_sta
))
3269 if (is_siso(&rate
)) {
3270 num_rates
= IWL_MVM_RS_INITIAL_SISO_NUM_RATES
;
3271 num_retries
= IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE
;
3272 } else if (is_mimo(&rate
)) {
3273 num_rates
= IWL_MVM_RS_INITIAL_MIMO_NUM_RATES
;
3274 num_retries
= IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE
;
3276 num_rates
= IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES
;
3277 num_retries
= IWL_MVM_RS_INITIAL_LEGACY_RETRIES
;
3281 rs_fill_rates_for_column(mvm
, lq_sta
, &rate
, lq_cmd
->rs_table
, &index
,
3282 num_rates
, num_retries
, valid_tx_ant
,
3285 rs_get_lower_rate_down_column(lq_sta
, &rate
);
3287 if (is_siso(&rate
)) {
3288 num_rates
= IWL_MVM_RS_SECONDARY_SISO_NUM_RATES
;
3289 num_retries
= IWL_MVM_RS_SECONDARY_SISO_RETRIES
;
3290 lq_cmd
->mimo_delim
= index
;
3291 } else if (is_legacy(&rate
)) {
3292 num_rates
= IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES
;
3293 num_retries
= IWL_MVM_RS_SECONDARY_LEGACY_RETRIES
;
3300 rs_fill_rates_for_column(mvm
, lq_sta
, &rate
, lq_cmd
->rs_table
, &index
,
3301 num_rates
, num_retries
, valid_tx_ant
,
3304 rs_get_lower_rate_down_column(lq_sta
, &rate
);
3306 num_rates
= IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES
;
3307 num_retries
= IWL_MVM_RS_SECONDARY_LEGACY_RETRIES
;
3309 rs_fill_rates_for_column(mvm
, lq_sta
, &rate
, lq_cmd
->rs_table
, &index
,
3310 num_rates
, num_retries
, valid_tx_ant
,
3315 struct rs_bfer_active_iter_data
{
3316 struct ieee80211_sta
*exclude_sta
;
3317 struct iwl_mvm_sta
*bfer_mvmsta
;
3320 static void rs_bfer_active_iter(void *_data
,
3321 struct ieee80211_sta
*sta
)
3323 struct rs_bfer_active_iter_data
*data
= _data
;
3324 struct iwl_mvm_sta
*mvmsta
= iwl_mvm_sta_from_mac80211(sta
);
3325 struct iwl_lq_cmd
*lq_cmd
= &mvmsta
->lq_sta
.lq
;
3326 u32 ss_params
= le32_to_cpu(lq_cmd
->ss_params
);
3328 if (sta
== data
->exclude_sta
)
3331 /* The current sta has BFER allowed */
3332 if (ss_params
& LQ_SS_BFER_ALLOWED
) {
3333 WARN_ON_ONCE(data
->bfer_mvmsta
!= NULL
);
3335 data
->bfer_mvmsta
= mvmsta
;
3339 static int rs_bfer_priority(struct iwl_mvm_sta
*sta
)
3342 enum nl80211_iftype viftype
= ieee80211_vif_type_p2p(sta
->vif
);
3345 case NL80211_IFTYPE_AP
:
3346 case NL80211_IFTYPE_P2P_GO
:
3349 case NL80211_IFTYPE_P2P_CLIENT
:
3352 case NL80211_IFTYPE_STATION
:
3356 WARN_ONCE(true, "viftype %d sta_id %d", viftype
, sta
->sta_id
);
3363 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3364 static int rs_bfer_priority_cmp(struct iwl_mvm_sta
*sta1
,
3365 struct iwl_mvm_sta
*sta2
)
3367 int prio1
= rs_bfer_priority(sta1
);
3368 int prio2
= rs_bfer_priority(sta2
);
3377 static void rs_set_lq_ss_params(struct iwl_mvm
*mvm
,
3378 struct ieee80211_sta
*sta
,
3379 struct iwl_lq_sta
*lq_sta
,
3380 const struct rs_rate
*initial_rate
)
3382 struct iwl_lq_cmd
*lq_cmd
= &lq_sta
->lq
;
3383 struct iwl_mvm_sta
*mvmsta
= iwl_mvm_sta_from_mac80211(sta
);
3384 struct rs_bfer_active_iter_data data
= {
3386 .bfer_mvmsta
= NULL
,
3388 struct iwl_mvm_sta
*bfer_mvmsta
= NULL
;
3389 u32 ss_params
= LQ_SS_PARAMS_VALID
;
3391 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm
, sta
))
3394 #ifdef CONFIG_MAC80211_DEBUGFS
3395 /* Check if forcing the decision is configured.
3396 * Note that SISO is forced by not allowing STBC or BFER
3398 if (lq_sta
->pers
.ss_force
== RS_SS_FORCE_STBC
)
3399 ss_params
|= (LQ_SS_STBC_1SS_ALLOWED
| LQ_SS_FORCE
);
3400 else if (lq_sta
->pers
.ss_force
== RS_SS_FORCE_BFER
)
3401 ss_params
|= (LQ_SS_BFER_ALLOWED
| LQ_SS_FORCE
);
3403 if (lq_sta
->pers
.ss_force
!= RS_SS_FORCE_NONE
) {
3404 IWL_DEBUG_RATE(mvm
, "Forcing single stream Tx decision %d\n",
3405 lq_sta
->pers
.ss_force
);
3410 if (lq_sta
->stbc_capable
)
3411 ss_params
|= LQ_SS_STBC_1SS_ALLOWED
;
3413 if (!lq_sta
->bfer_capable
)
3416 ieee80211_iterate_stations_atomic(mvm
->hw
,
3417 rs_bfer_active_iter
,
3419 bfer_mvmsta
= data
.bfer_mvmsta
;
3421 /* This code is safe as it doesn't run concurrently for different
3422 * stations. This is guaranteed by the fact that calls to
3423 * ieee80211_tx_status wouldn't run concurrently for a single HW.
3426 IWL_DEBUG_RATE(mvm
, "No sta with BFER allowed found. Allow\n");
3428 ss_params
|= LQ_SS_BFER_ALLOWED
;
3432 IWL_DEBUG_RATE(mvm
, "Found existing sta %d with BFER activated\n",
3433 bfer_mvmsta
->sta_id
);
3435 /* Disallow BFER on another STA if active and we're a higher priority */
3436 if (rs_bfer_priority_cmp(mvmsta
, bfer_mvmsta
) > 0) {
3437 struct iwl_lq_cmd
*bfersta_lq_cmd
= &bfer_mvmsta
->lq_sta
.lq
;
3438 u32 bfersta_ss_params
= le32_to_cpu(bfersta_lq_cmd
->ss_params
);
3440 bfersta_ss_params
&= ~LQ_SS_BFER_ALLOWED
;
3441 bfersta_lq_cmd
->ss_params
= cpu_to_le32(bfersta_ss_params
);
3442 iwl_mvm_send_lq_cmd(mvm
, bfersta_lq_cmd
, false);
3444 ss_params
|= LQ_SS_BFER_ALLOWED
;
3446 "Lower priority BFER sta found (%d). Switch BFER\n",
3447 bfer_mvmsta
->sta_id
);
3450 lq_cmd
->ss_params
= cpu_to_le32(ss_params
);
3453 static void rs_fill_lq_cmd(struct iwl_mvm
*mvm
,
3454 struct ieee80211_sta
*sta
,
3455 struct iwl_lq_sta
*lq_sta
,
3456 const struct rs_rate
*initial_rate
)
3458 struct iwl_lq_cmd
*lq_cmd
= &lq_sta
->lq
;
3459 struct iwl_mvm_sta
*mvmsta
;
3460 struct iwl_mvm_vif
*mvmvif
;
3462 lq_cmd
->agg_disable_start_th
= IWL_MVM_RS_AGG_DISABLE_START
;
3463 lq_cmd
->agg_time_limit
=
3464 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT
);
3466 #ifdef CONFIG_MAC80211_DEBUGFS
3467 if (lq_sta
->pers
.dbg_fixed_rate
) {
3468 rs_build_rates_table_from_fixed(mvm
, lq_cmd
,
3470 lq_sta
->pers
.dbg_fixed_rate
);
3474 if (WARN_ON_ONCE(!sta
|| !initial_rate
))
3477 rs_build_rates_table(mvm
, sta
, lq_sta
, initial_rate
);
3479 if (fw_has_api(&mvm
->fw
->ucode_capa
, IWL_UCODE_TLV_API_LQ_SS_PARAMS
))
3480 rs_set_lq_ss_params(mvm
, sta
, lq_sta
, initial_rate
);
3482 mvmsta
= iwl_mvm_sta_from_mac80211(sta
);
3483 mvmvif
= iwl_mvm_vif_from_mac80211(mvmsta
->vif
);
3485 if (num_of_ant(initial_rate
->ant
) == 1)
3486 lq_cmd
->single_stream_ant_msk
= initial_rate
->ant
;
3488 lq_cmd
->agg_frame_cnt_limit
= mvmsta
->max_agg_bufsize
;
3491 * In case of low latency, tell the firmware to leave a frame in the
3492 * Tx Fifo so that it can start a transaction in the same TxOP. This
3493 * basically allows the firmware to send bursts.
3495 if (iwl_mvm_vif_low_latency(mvmvif
))
3496 lq_cmd
->agg_frame_cnt_limit
--;
3498 if (mvmsta
->vif
->p2p
)
3499 lq_cmd
->flags
|= LQ_FLAG_USE_RTS_MSK
;
3501 lq_cmd
->agg_time_limit
=
3502 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm
, sta
));
3505 static void *rs_alloc(struct ieee80211_hw
*hw
, struct dentry
*debugfsdir
)
3509 /* rate scale requires free function to be implemented */
3510 static void rs_free(void *mvm_rate
)
3515 static void rs_free_sta(void *mvm_r
, struct ieee80211_sta
*sta
,
3518 struct iwl_op_mode
*op_mode __maybe_unused
= mvm_r
;
3519 struct iwl_mvm
*mvm __maybe_unused
= IWL_OP_MODE_GET_MVM(op_mode
);
3521 IWL_DEBUG_RATE(mvm
, "enter\n");
3522 IWL_DEBUG_RATE(mvm
, "leave\n");
3525 #ifdef CONFIG_MAC80211_DEBUGFS
3526 int rs_pretty_print_rate(char *buf
, const u32 rate
)
3530 u8 mcs
= 0, nss
= 0;
3531 u8 ant
= (rate
& RATE_MCS_ANT_ABC_MSK
) >> RATE_MCS_ANT_POS
;
3533 if (!(rate
& RATE_MCS_HT_MSK
) &&
3534 !(rate
& RATE_MCS_VHT_MSK
)) {
3535 int index
= iwl_hwrate_to_plcp_idx(rate
);
3537 return sprintf(buf
, "Legacy | ANT: %s Rate: %s Mbps\n",
3539 index
== IWL_RATE_INVALID
? "BAD" :
3540 iwl_rate_mcs
[index
].mbps
);
3543 if (rate
& RATE_MCS_VHT_MSK
) {
3545 mcs
= rate
& RATE_VHT_MCS_RATE_CODE_MSK
;
3546 nss
= ((rate
& RATE_VHT_MCS_NSS_MSK
)
3547 >> RATE_VHT_MCS_NSS_POS
) + 1;
3548 } else if (rate
& RATE_MCS_HT_MSK
) {
3550 mcs
= rate
& RATE_HT_MCS_INDEX_MSK
;
3552 type
= "Unknown"; /* shouldn't happen */
3555 switch (rate
& RATE_MCS_CHAN_WIDTH_MSK
) {
3556 case RATE_MCS_CHAN_WIDTH_20
:
3559 case RATE_MCS_CHAN_WIDTH_40
:
3562 case RATE_MCS_CHAN_WIDTH_80
:
3565 case RATE_MCS_CHAN_WIDTH_160
:
3572 return sprintf(buf
, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3573 type
, rs_pretty_ant(ant
), bw
, mcs
, nss
,
3574 (rate
& RATE_MCS_SGI_MSK
) ? "SGI " : "NGI ",
3575 (rate
& RATE_MCS_HT_STBC_MSK
) ? "STBC " : "",
3576 (rate
& RATE_MCS_LDPC_MSK
) ? "LDPC " : "",
3577 (rate
& RATE_MCS_BF_MSK
) ? "BF " : "",
3578 (rate
& RATE_MCS_ZLF_MSK
) ? "ZLF " : "");
3582 * Program the device to use fixed rate for frame transmit
3583 * This is for debugging/testing only
3584 * once the device start use fixed rate, we need to reload the module
3585 * to being back the normal operation.
3587 static void rs_program_fix_rate(struct iwl_mvm
*mvm
,
3588 struct iwl_lq_sta
*lq_sta
)
3590 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
3591 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3592 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3594 IWL_DEBUG_RATE(mvm
, "sta_id %d rate 0x%X\n",
3595 lq_sta
->lq
.sta_id
, lq_sta
->pers
.dbg_fixed_rate
);
3597 if (lq_sta
->pers
.dbg_fixed_rate
) {
3598 rs_fill_lq_cmd(mvm
, NULL
, lq_sta
, NULL
);
3599 iwl_mvm_send_lq_cmd(lq_sta
->pers
.drv
, &lq_sta
->lq
, false);
3603 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
3604 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3606 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3607 struct iwl_mvm
*mvm
;
3612 mvm
= lq_sta
->pers
.drv
;
3613 memset(buf
, 0, sizeof(buf
));
3614 buf_size
= min(count
, sizeof(buf
) - 1);
3615 if (copy_from_user(buf
, user_buf
, buf_size
))
3618 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
3619 lq_sta
->pers
.dbg_fixed_rate
= parsed_rate
;
3621 lq_sta
->pers
.dbg_fixed_rate
= 0;
3623 rs_program_fix_rate(mvm
, lq_sta
);
3628 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
3629 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3636 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3637 struct iwl_mvm
*mvm
;
3638 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
3639 struct rs_rate
*rate
= &tbl
->rate
;
3641 mvm
= lq_sta
->pers
.drv
;
3642 buff
= kmalloc(2048, GFP_KERNEL
);
3646 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
3647 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%lX\n",
3648 lq_sta
->total_failed
, lq_sta
->total_success
,
3649 lq_sta
->active_legacy_rate
);
3650 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
3651 lq_sta
->pers
.dbg_fixed_rate
);
3652 desc
+= sprintf(buff
+desc
, "valid_tx_ant %s%s%s\n",
3653 (iwl_mvm_get_valid_tx_ant(mvm
) & ANT_A
) ? "ANT_A," : "",
3654 (iwl_mvm_get_valid_tx_ant(mvm
) & ANT_B
) ? "ANT_B," : "",
3655 (iwl_mvm_get_valid_tx_ant(mvm
) & ANT_C
) ? "ANT_C" : "");
3656 desc
+= sprintf(buff
+desc
, "lq type %s\n",
3657 (is_legacy(rate
)) ? "legacy" :
3658 is_vht(rate
) ? "VHT" : "HT");
3659 if (!is_legacy(rate
)) {
3660 desc
+= sprintf(buff
+ desc
, " %s",
3661 (is_siso(rate
)) ? "SISO" : "MIMO2");
3662 desc
+= sprintf(buff
+ desc
, " %s",
3663 (is_ht20(rate
)) ? "20MHz" :
3664 (is_ht40(rate
)) ? "40MHz" :
3665 (is_ht80(rate
)) ? "80Mhz" : "BAD BW");
3666 desc
+= sprintf(buff
+ desc
, " %s %s %s\n",
3667 (rate
->sgi
) ? "SGI" : "NGI",
3668 (rate
->ldpc
) ? "LDPC" : "BCC",
3669 (lq_sta
->is_agg
) ? "AGG on" : "");
3671 desc
+= sprintf(buff
+desc
, "last tx rate=0x%X\n",
3672 lq_sta
->last_rate_n_flags
);
3673 desc
+= sprintf(buff
+desc
,
3674 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3676 lq_sta
->lq
.mimo_delim
,
3677 lq_sta
->lq
.single_stream_ant_msk
,
3678 lq_sta
->lq
.dual_stream_ant_msk
);
3680 desc
+= sprintf(buff
+desc
,
3681 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3682 le16_to_cpu(lq_sta
->lq
.agg_time_limit
),
3683 lq_sta
->lq
.agg_disable_start_th
,
3684 lq_sta
->lq
.agg_frame_cnt_limit
);
3686 desc
+= sprintf(buff
+desc
, "reduced tpc=%d\n", lq_sta
->lq
.reduced_tpc
);
3687 ss_params
= le32_to_cpu(lq_sta
->lq
.ss_params
);
3688 desc
+= sprintf(buff
+desc
, "single stream params: %s%s%s%s\n",
3689 (ss_params
& LQ_SS_PARAMS_VALID
) ?
3690 "VALID" : "INVALID",
3691 (ss_params
& LQ_SS_BFER_ALLOWED
) ?
3693 (ss_params
& LQ_SS_STBC_1SS_ALLOWED
) ?
3695 (ss_params
& LQ_SS_FORCE
) ?
3697 desc
+= sprintf(buff
+desc
,
3698 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3699 lq_sta
->lq
.initial_rate_index
[0],
3700 lq_sta
->lq
.initial_rate_index
[1],
3701 lq_sta
->lq
.initial_rate_index
[2],
3702 lq_sta
->lq
.initial_rate_index
[3]);
3704 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++) {
3705 u32 r
= le32_to_cpu(lq_sta
->lq
.rs_table
[i
]);
3707 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X ", i
, r
);
3708 desc
+= rs_pretty_print_rate(buff
+desc
, r
);
3711 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3716 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
3717 .write
= rs_sta_dbgfs_scale_table_write
,
3718 .read
= rs_sta_dbgfs_scale_table_read
,
3719 .open
= simple_open
,
3720 .llseek
= default_llseek
,
3722 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
3723 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3729 struct iwl_scale_tbl_info
*tbl
;
3730 struct rs_rate
*rate
;
3731 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3733 buff
= kmalloc(1024, GFP_KERNEL
);
3737 for (i
= 0; i
< LQ_SIZE
; i
++) {
3738 tbl
= &(lq_sta
->lq_info
[i
]);
3740 desc
+= sprintf(buff
+desc
,
3741 "%s type=%d SGI=%d BW=%s DUP=0\n"
3743 lq_sta
->active_tbl
== i
? "*" : "x",
3746 is_ht20(rate
) ? "20Mhz" :
3747 is_ht40(rate
) ? "40Mhz" :
3748 is_ht80(rate
) ? "80Mhz" : "ERR",
3750 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
3751 desc
+= sprintf(buff
+desc
,
3752 "counter=%d success=%d %%=%d\n",
3753 tbl
->win
[j
].counter
,
3754 tbl
->win
[j
].success_counter
,
3755 tbl
->win
[j
].success_ratio
);
3758 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3763 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
3764 .read
= rs_sta_dbgfs_stats_table_read
,
3765 .open
= simple_open
,
3766 .llseek
= default_llseek
,
3769 static ssize_t
rs_sta_dbgfs_drv_tx_stats_read(struct file
*file
,
3770 char __user
*user_buf
,
3771 size_t count
, loff_t
*ppos
)
3773 static const char * const column_name
[] = {
3774 [RS_COLUMN_LEGACY_ANT_A
] = "LEGACY_ANT_A",
3775 [RS_COLUMN_LEGACY_ANT_B
] = "LEGACY_ANT_B",
3776 [RS_COLUMN_SISO_ANT_A
] = "SISO_ANT_A",
3777 [RS_COLUMN_SISO_ANT_B
] = "SISO_ANT_B",
3778 [RS_COLUMN_SISO_ANT_A_SGI
] = "SISO_ANT_A_SGI",
3779 [RS_COLUMN_SISO_ANT_B_SGI
] = "SISO_ANT_B_SGI",
3780 [RS_COLUMN_MIMO2
] = "MIMO2",
3781 [RS_COLUMN_MIMO2_SGI
] = "MIMO2_SGI",
3784 static const char * const rate_name
[] = {
3785 [IWL_RATE_1M_INDEX
] = "1M",
3786 [IWL_RATE_2M_INDEX
] = "2M",
3787 [IWL_RATE_5M_INDEX
] = "5.5M",
3788 [IWL_RATE_11M_INDEX
] = "11M",
3789 [IWL_RATE_6M_INDEX
] = "6M|MCS0",
3790 [IWL_RATE_9M_INDEX
] = "9M",
3791 [IWL_RATE_12M_INDEX
] = "12M|MCS1",
3792 [IWL_RATE_18M_INDEX
] = "18M|MCS2",
3793 [IWL_RATE_24M_INDEX
] = "24M|MCS3",
3794 [IWL_RATE_36M_INDEX
] = "36M|MCS4",
3795 [IWL_RATE_48M_INDEX
] = "48M|MCS5",
3796 [IWL_RATE_54M_INDEX
] = "54M|MCS6",
3797 [IWL_RATE_MCS_7_INDEX
] = "MCS7",
3798 [IWL_RATE_MCS_8_INDEX
] = "MCS8",
3799 [IWL_RATE_MCS_9_INDEX
] = "MCS9",
3802 char *buff
, *pos
, *endpos
;
3805 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3806 struct rs_rate_stats
*stats
;
3807 static const size_t bufsz
= 1024;
3809 buff
= kmalloc(bufsz
, GFP_KERNEL
);
3814 endpos
= pos
+ bufsz
;
3816 pos
+= scnprintf(pos
, endpos
- pos
, "COLUMN,");
3817 for (rate
= 0; rate
< IWL_RATE_COUNT
; rate
++)
3818 pos
+= scnprintf(pos
, endpos
- pos
, "%s,", rate_name
[rate
]);
3819 pos
+= scnprintf(pos
, endpos
- pos
, "\n");
3821 for (col
= 0; col
< RS_COLUMN_COUNT
; col
++) {
3822 pos
+= scnprintf(pos
, endpos
- pos
,
3823 "%s,", column_name
[col
]);
3825 for (rate
= 0; rate
< IWL_RATE_COUNT
; rate
++) {
3826 stats
= &(lq_sta
->pers
.tx_stats
[col
][rate
]);
3827 pos
+= scnprintf(pos
, endpos
- pos
,
3832 pos
+= scnprintf(pos
, endpos
- pos
, "\n");
3835 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, pos
- buff
);
3840 static ssize_t
rs_sta_dbgfs_drv_tx_stats_write(struct file
*file
,
3841 const char __user
*user_buf
,
3842 size_t count
, loff_t
*ppos
)
3844 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3845 memset(lq_sta
->pers
.tx_stats
, 0, sizeof(lq_sta
->pers
.tx_stats
));
3850 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops
= {
3851 .read
= rs_sta_dbgfs_drv_tx_stats_read
,
3852 .write
= rs_sta_dbgfs_drv_tx_stats_write
,
3853 .open
= simple_open
,
3854 .llseek
= default_llseek
,
3857 static ssize_t
iwl_dbgfs_ss_force_read(struct file
*file
,
3858 char __user
*user_buf
,
3859 size_t count
, loff_t
*ppos
)
3861 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3863 int bufsz
= sizeof(buf
);
3865 static const char * const ss_force_name
[] = {
3866 [RS_SS_FORCE_NONE
] = "none",
3867 [RS_SS_FORCE_STBC
] = "stbc",
3868 [RS_SS_FORCE_BFER
] = "bfer",
3869 [RS_SS_FORCE_SISO
] = "siso",
3872 pos
+= scnprintf(buf
+pos
, bufsz
-pos
, "%s\n",
3873 ss_force_name
[lq_sta
->pers
.ss_force
]);
3874 return simple_read_from_buffer(user_buf
, count
, ppos
, buf
, pos
);
3877 static ssize_t
iwl_dbgfs_ss_force_write(struct iwl_lq_sta
*lq_sta
, char *buf
,
3878 size_t count
, loff_t
*ppos
)
3880 struct iwl_mvm
*mvm
= lq_sta
->pers
.drv
;
3883 if (!strncmp("none", buf
, 4)) {
3884 lq_sta
->pers
.ss_force
= RS_SS_FORCE_NONE
;
3885 } else if (!strncmp("siso", buf
, 4)) {
3886 lq_sta
->pers
.ss_force
= RS_SS_FORCE_SISO
;
3887 } else if (!strncmp("stbc", buf
, 4)) {
3888 if (lq_sta
->stbc_capable
) {
3889 lq_sta
->pers
.ss_force
= RS_SS_FORCE_STBC
;
3892 "can't force STBC. peer doesn't support\n");
3895 } else if (!strncmp("bfer", buf
, 4)) {
3896 if (lq_sta
->bfer_capable
) {
3897 lq_sta
->pers
.ss_force
= RS_SS_FORCE_BFER
;
3900 "can't force BFER. peer doesn't support\n");
3904 IWL_ERR(mvm
, "valid values none|siso|stbc|bfer\n");
3907 return ret
?: count
;
3910 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
3911 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
3912 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
3913 if (!debugfs_create_file(#name, mode, parent, lq_sta, \
3914 &iwl_dbgfs_##name##_ops)) \
3918 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force
, 32);
3920 static void rs_add_debugfs(void *mvm
, void *priv_sta
, struct dentry
*dir
)
3922 struct iwl_lq_sta
*lq_sta
= priv_sta
;
3923 struct iwl_mvm_sta
*mvmsta
;
3925 mvmsta
= container_of(lq_sta
, struct iwl_mvm_sta
, lq_sta
);
3930 debugfs_create_file("rate_scale_table", S_IRUSR
| S_IWUSR
, dir
,
3931 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
3932 debugfs_create_file("rate_stats_table", S_IRUSR
, dir
,
3933 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
3934 debugfs_create_file("drv_tx_stats", S_IRUSR
| S_IWUSR
, dir
,
3935 lq_sta
, &rs_sta_dbgfs_drv_tx_stats_ops
);
3936 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR
| S_IWUSR
, dir
,
3937 &lq_sta
->tx_agg_tid_en
);
3938 debugfs_create_u8("reduced_tpc", S_IRUSR
| S_IWUSR
, dir
,
3939 &lq_sta
->pers
.dbg_fixed_txp_reduction
);
3941 MVM_DEBUGFS_ADD_FILE_RS(ss_force
, dir
, S_IRUSR
| S_IWUSR
);
3944 IWL_ERR((struct iwl_mvm
*)mvm
, "Can't create debugfs entity\n");
3947 static void rs_remove_debugfs(void *mvm
, void *mvm_sta
)
3953 * Initialization of rate scaling information is done by driver after
3954 * the station is added. Since mac80211 calls this function before a
3955 * station is added we ignore it.
3957 static void rs_rate_init_stub(void *mvm_r
,
3958 struct ieee80211_supported_band
*sband
,
3959 struct cfg80211_chan_def
*chandef
,
3960 struct ieee80211_sta
*sta
, void *mvm_sta
)
3964 static const struct rate_control_ops rs_mvm_ops
= {
3966 .tx_status
= rs_mac80211_tx_status
,
3967 .get_rate
= rs_get_rate
,
3968 .rate_init
= rs_rate_init_stub
,
3971 .alloc_sta
= rs_alloc_sta
,
3972 .free_sta
= rs_free_sta
,
3973 .rate_update
= rs_rate_update
,
3974 #ifdef CONFIG_MAC80211_DEBUGFS
3975 .add_sta_debugfs
= rs_add_debugfs
,
3976 .remove_sta_debugfs
= rs_remove_debugfs
,
3980 int iwl_mvm_rate_control_register(void)
3982 return ieee80211_rate_control_register(&rs_mvm_ops
);
3985 void iwl_mvm_rate_control_unregister(void)
3987 ieee80211_rate_control_unregister(&rs_mvm_ops
);
3991 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3992 * Tx protection, according to this request and previous requests,
3993 * and send the LQ command.
3994 * @mvmsta: The station
3995 * @enable: Enable Tx protection?
3997 int iwl_mvm_tx_protection(struct iwl_mvm
*mvm
, struct iwl_mvm_sta
*mvmsta
,
4000 struct iwl_lq_cmd
*lq
= &mvmsta
->lq_sta
.lq
;
4002 lockdep_assert_held(&mvm
->mutex
);
4005 if (mvmsta
->tx_protection
== 0)
4006 lq
->flags
|= LQ_FLAG_USE_RTS_MSK
;
4007 mvmsta
->tx_protection
++;
4009 mvmsta
->tx_protection
--;
4010 if (mvmsta
->tx_protection
== 0)
4011 lq
->flags
&= ~LQ_FLAG_USE_RTS_MSK
;
4014 return iwl_mvm_send_lq_cmd(mvm
, lq
, false);