1 /******************************************************************************
3 * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.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>
42 #define RS_NAME "iwl-agn-rs"
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY 1
46 #define IWL_HT_NUMBER_TRY 3
48 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52 /* max allowed rate miss before sync LQ cmd */
53 #define IWL_MISSED_RATE_MAX 15
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
57 static u8 rs_ht_to_legacy
[] = {
58 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
59 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
61 IWL_RATE_6M_INDEX
, IWL_RATE_9M_INDEX
,
62 IWL_RATE_12M_INDEX
, IWL_RATE_18M_INDEX
,
63 IWL_RATE_24M_INDEX
, IWL_RATE_36M_INDEX
,
64 IWL_RATE_48M_INDEX
, IWL_RATE_54M_INDEX
67 static const u8 ant_toggle_lookup
[] = {
68 /*ANT_NONE -> */ ANT_NONE
,
71 /*ANT_AB -> */ ANT_BC
,
73 /*ANT_AC -> */ ANT_AB
,
74 /*ANT_BC -> */ ANT_AC
,
75 /*ANT_ABC -> */ ANT_ABC
,
79 * struct iwl_rate_scale_data -- tx success history for one rate
81 struct iwl_rate_scale_data
{
82 u64 data
; /* bitmap of successful frames */
83 s32 success_counter
; /* number of frames successful */
84 s32 success_ratio
; /* per-cent * 128 */
85 s32 counter
; /* number of frames attempted */
86 s32 average_tpt
; /* success ratio * expected throughput */
91 * struct iwl_scale_tbl_info -- tx params and success history for all rates
93 * There are two of these in struct iwl_lq_sta,
94 * one for "active", and one for "search".
96 struct iwl_scale_tbl_info
{
97 enum iwl_table_type lq_type
;
99 u8 is_SGI
; /* 1 = short guard interval */
100 u8 is_fat
; /* 1 = 40 MHz channel width */
101 u8 is_dup
; /* 1 = duplicated data streams */
102 u8 action
; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
103 u8 max_search
; /* maximun number of tables we can search */
104 s32
*expected_tpt
; /* throughput metrics; expected_tpt_G, etc. */
105 u32 current_rate
; /* rate_n_flags, uCode API format */
106 struct iwl_rate_scale_data win
[IWL_RATE_COUNT
]; /* rate histories */
109 struct iwl_traffic_load
{
110 unsigned long time_stamp
; /* age of the oldest statistics */
111 u32 packet_count
[TID_QUEUE_MAX_SIZE
]; /* packet count in this time
113 u32 total
; /* total num of packets during the
114 * last TID_MAX_TIME_DIFF */
115 u8 queue_count
; /* number of queues that has
116 * been used since the last cleanup */
117 u8 head
; /* start of the circular buffer */
121 * struct iwl_lq_sta -- driver's rate scaling private structure
123 * Pointer to this gets passed back and forth between driver and mac80211.
126 u8 active_tbl
; /* index of active table, range 0-1 */
127 u8 enable_counter
; /* indicates HT mode */
128 u8 stay_in_tbl
; /* 1: disallow, 0: allow search for new mode */
129 u8 search_better_tbl
; /* 1: currently trying alternate mode */
132 /* The following determine when to search for a new mode */
133 u32 table_count_limit
;
134 u32 max_failure_limit
; /* # failed frames before new search */
135 u32 max_success_limit
; /* # successful frames before new search */
137 u32 total_failed
; /* total failed frames, any/all rates */
138 u32 total_success
; /* total successful frames, any/all rates */
139 u64 flush_timer
; /* time staying in mode before new search */
141 u8 action_counter
; /* # mode-switch actions tried */
144 enum ieee80211_band band
;
147 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
149 u16 active_legacy_rate
;
150 u16 active_siso_rate
;
151 u16 active_mimo2_rate
;
152 u16 active_mimo3_rate
;
153 u16 active_rate_basic
;
154 s8 max_rate_idx
; /* Max rate set by user */
155 u8 missed_rate_counter
;
157 struct iwl_link_quality_cmd lq
;
158 struct iwl_scale_tbl_info lq_info
[LQ_SIZE
]; /* "active", "search" */
159 struct iwl_traffic_load load
[TID_MAX_LOAD_COUNT
];
161 #ifdef CONFIG_MAC80211_DEBUGFS
162 struct dentry
*rs_sta_dbgfs_scale_table_file
;
163 struct dentry
*rs_sta_dbgfs_stats_table_file
;
164 struct dentry
*rs_sta_dbgfs_rate_scale_data_file
;
165 struct dentry
*rs_sta_dbgfs_tx_agg_tid_en_file
;
168 struct iwl_priv
*drv
;
170 /* used to be in sta_info */
172 /* last tx rate_n_flags */
173 u32 last_rate_n_flags
;
176 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
178 struct ieee80211_sta
*sta
,
179 struct iwl_lq_sta
*lq_sta
);
180 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
181 struct iwl_lq_sta
*lq_sta
, u32 rate_n_flags
);
184 #ifdef CONFIG_MAC80211_DEBUGFS
185 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
186 u32
*rate_n_flags
, int index
);
188 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
189 u32
*rate_n_flags
, int index
)
194 * Expected throughput metrics for following rates:
195 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
196 * "G" is the only table that supports CCK (the first 4 rates).
199 static s32 expected_tpt_A
[IWL_RATE_COUNT
] = {
200 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
203 static s32 expected_tpt_G
[IWL_RATE_COUNT
] = {
204 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
207 static s32 expected_tpt_siso20MHz
[IWL_RATE_COUNT
] = {
208 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
211 static s32 expected_tpt_siso20MHzSGI
[IWL_RATE_COUNT
] = {
212 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
215 static s32 expected_tpt_mimo2_20MHz
[IWL_RATE_COUNT
] = {
216 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
219 static s32 expected_tpt_mimo2_20MHzSGI
[IWL_RATE_COUNT
] = {
220 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
223 static s32 expected_tpt_siso40MHz
[IWL_RATE_COUNT
] = {
224 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
227 static s32 expected_tpt_siso40MHzSGI
[IWL_RATE_COUNT
] = {
228 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
231 static s32 expected_tpt_mimo2_40MHz
[IWL_RATE_COUNT
] = {
232 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
235 static s32 expected_tpt_mimo2_40MHzSGI
[IWL_RATE_COUNT
] = {
236 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
239 /* Expected throughput metric MIMO3 */
240 static s32 expected_tpt_mimo3_20MHz
[IWL_RATE_COUNT
] = {
241 0, 0, 0, 0, 99, 99, 153, 186, 208, 239, 256, 263, 268
244 static s32 expected_tpt_mimo3_20MHzSGI
[IWL_RATE_COUNT
] = {
245 0, 0, 0, 0, 106, 106, 162, 194, 215, 246, 262, 268, 273
248 static s32 expected_tpt_mimo3_40MHz
[IWL_RATE_COUNT
] = {
249 0, 0, 0, 0, 152, 152, 211, 239, 255, 279, 290, 294, 297
252 static s32 expected_tpt_mimo3_40MHzSGI
[IWL_RATE_COUNT
] = {
253 0, 0, 0, 0, 160, 160, 219, 245, 261, 284, 294, 297, 300
257 const static struct iwl_rate_mcs_info iwl_rate_mcs
[IWL_RATE_COUNT
] = {
273 static inline u8
rs_extract_rate(u32 rate_n_flags
)
275 return (u8
)(rate_n_flags
& 0xFF);
278 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data
*window
)
281 window
->success_counter
= 0;
282 window
->success_ratio
= IWL_INVALID_VALUE
;
284 window
->average_tpt
= IWL_INVALID_VALUE
;
288 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
290 return (ant_type
& valid_antenna
) == ant_type
;
294 * removes the old data from the statistics. All data that is older than
295 * TID_MAX_TIME_DIFF, will be deleted.
297 static void rs_tl_rm_old_stats(struct iwl_traffic_load
*tl
, u32 curr_time
)
299 /* The oldest age we want to keep */
300 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
302 while (tl
->queue_count
&&
303 (tl
->time_stamp
< oldest_time
)) {
304 tl
->total
-= tl
->packet_count
[tl
->head
];
305 tl
->packet_count
[tl
->head
] = 0;
306 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
309 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
315 * increment traffic load value for tid and also remove
316 * any old values if passed the certain time period
318 static u8
rs_tl_add_packet(struct iwl_lq_sta
*lq_data
,
319 struct ieee80211_hdr
*hdr
)
321 u32 curr_time
= jiffies_to_msecs(jiffies
);
324 struct iwl_traffic_load
*tl
= NULL
;
327 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
328 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
331 return MAX_TID_COUNT
;
333 tl
= &lq_data
->load
[tid
];
335 curr_time
-= curr_time
% TID_ROUND_VALUE
;
337 /* Happens only for the first packet. Initialize the data */
338 if (!(tl
->queue_count
)) {
340 tl
->time_stamp
= curr_time
;
343 tl
->packet_count
[0] = 1;
344 return MAX_TID_COUNT
;
347 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
348 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
350 /* The history is too long: remove data that is older than */
351 /* TID_MAX_TIME_DIFF */
352 if (index
>= TID_QUEUE_MAX_SIZE
)
353 rs_tl_rm_old_stats(tl
, curr_time
);
355 index
= (tl
->head
+ index
) % TID_QUEUE_MAX_SIZE
;
356 tl
->packet_count
[index
] = tl
->packet_count
[index
] + 1;
357 tl
->total
= tl
->total
+ 1;
359 if ((index
+ 1) > tl
->queue_count
)
360 tl
->queue_count
= index
+ 1;
366 get the traffic load value for tid
368 static u32
rs_tl_get_load(struct iwl_lq_sta
*lq_data
, u8 tid
)
370 u32 curr_time
= jiffies_to_msecs(jiffies
);
373 struct iwl_traffic_load
*tl
= NULL
;
375 if (tid
>= TID_MAX_LOAD_COUNT
)
378 tl
= &(lq_data
->load
[tid
]);
380 curr_time
-= curr_time
% TID_ROUND_VALUE
;
382 if (!(tl
->queue_count
))
385 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
386 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
388 /* The history is too long: remove data that is older than */
389 /* TID_MAX_TIME_DIFF */
390 if (index
>= TID_QUEUE_MAX_SIZE
)
391 rs_tl_rm_old_stats(tl
, curr_time
);
396 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv
*priv
,
397 struct iwl_lq_sta
*lq_data
, u8 tid
,
398 struct ieee80211_sta
*sta
)
400 if (rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
401 IWL_DEBUG_HT(priv
, "Starting Tx agg: STA: %pM tid: %d\n",
403 ieee80211_start_tx_ba_session(priv
->hw
, sta
->addr
, tid
);
407 static void rs_tl_turn_on_agg(struct iwl_priv
*priv
, u8 tid
,
408 struct iwl_lq_sta
*lq_data
,
409 struct ieee80211_sta
*sta
)
411 if ((tid
< TID_MAX_LOAD_COUNT
))
412 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
413 else if (tid
== IWL_AGG_ALL_TID
)
414 for (tid
= 0; tid
< TID_MAX_LOAD_COUNT
; tid
++)
415 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
418 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
420 return !!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
421 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
422 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
);
426 * rs_collect_tx_data - Update the success/failure sliding window
428 * We keep a sliding window of the last 62 packets transmitted
429 * at this rate. window->data contains the bitmask of successful
432 static int rs_collect_tx_data(struct iwl_rate_scale_data
*windows
,
433 int scale_index
, s32 tpt
, int retries
,
436 struct iwl_rate_scale_data
*window
= NULL
;
437 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
440 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
443 /* Select data for current tx bit rate */
444 window
= &(windows
[scale_index
]);
447 * Keep track of only the latest 62 tx frame attempts in this rate's
448 * history window; anything older isn't really relevant any more.
449 * If we have filled up the sliding window, drop the oldest attempt;
450 * if the oldest attempt (highest bit in bitmap) shows "success",
451 * subtract "1" from the success counter (this is the main reason
452 * we keep these bitmaps!).
454 while (retries
> 0) {
455 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
457 /* remove earliest */
458 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
460 if (window
->data
& mask
) {
461 window
->data
&= ~mask
;
462 window
->success_counter
--;
466 /* Increment frames-attempted counter */
469 /* Shift bitmap by one frame (throw away oldest history),
470 * OR in "1", and increment "success" if this
471 * frame was successful. */
474 window
->success_counter
++;
482 /* Calculate current success ratio, avoid divide-by-0! */
483 if (window
->counter
> 0)
484 window
->success_ratio
= 128 * (100 * window
->success_counter
)
487 window
->success_ratio
= IWL_INVALID_VALUE
;
489 fail_count
= window
->counter
- window
->success_counter
;
491 /* Calculate average throughput, if we have enough history. */
492 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
493 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
494 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
496 window
->average_tpt
= IWL_INVALID_VALUE
;
498 /* Tag this window as having been updated */
499 window
->stamp
= jiffies
;
505 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
507 /* FIXME:RS:remove this function and put the flags statically in the table */
508 static u32
rate_n_flags_from_tbl(struct iwl_priv
*priv
,
509 struct iwl_scale_tbl_info
*tbl
,
510 int index
, u8 use_green
)
512 u32 rate_n_flags
= 0;
514 if (is_legacy(tbl
->lq_type
)) {
515 rate_n_flags
= iwl_rates
[index
].plcp
;
516 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
517 rate_n_flags
|= RATE_MCS_CCK_MSK
;
519 } else if (is_Ht(tbl
->lq_type
)) {
520 if (index
> IWL_LAST_OFDM_RATE
) {
521 IWL_ERR(priv
, "Invalid HT rate index %d\n", index
);
522 index
= IWL_LAST_OFDM_RATE
;
524 rate_n_flags
= RATE_MCS_HT_MSK
;
526 if (is_siso(tbl
->lq_type
))
527 rate_n_flags
|= iwl_rates
[index
].plcp_siso
;
528 else if (is_mimo2(tbl
->lq_type
))
529 rate_n_flags
|= iwl_rates
[index
].plcp_mimo2
;
531 rate_n_flags
|= iwl_rates
[index
].plcp_mimo3
;
533 IWL_ERR(priv
, "Invalid tbl->lq_type %d\n", tbl
->lq_type
);
536 rate_n_flags
|= ((tbl
->ant_type
<< RATE_MCS_ANT_POS
) &
537 RATE_MCS_ANT_ABC_MSK
);
539 if (is_Ht(tbl
->lq_type
)) {
542 rate_n_flags
|= RATE_MCS_DUP_MSK
;
544 rate_n_flags
|= RATE_MCS_FAT_MSK
;
547 rate_n_flags
|= RATE_MCS_SGI_MSK
;
550 rate_n_flags
|= RATE_MCS_GF_MSK
;
551 if (is_siso(tbl
->lq_type
) && tbl
->is_SGI
) {
552 rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
553 IWL_ERR(priv
, "GF was set with SGI:SISO\n");
561 * Interpret uCode API's rate_n_flags format,
562 * fill "search" or "active" tx mode table.
564 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags
,
565 enum ieee80211_band band
,
566 struct iwl_scale_tbl_info
*tbl
,
569 u32 ant_msk
= (rate_n_flags
& RATE_MCS_ANT_ABC_MSK
);
570 u8 num_of_ant
= get_num_of_ant_from_rate(rate_n_flags
);
573 *rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
575 if (*rate_idx
== IWL_RATE_INVALID
) {
579 tbl
->is_SGI
= 0; /* default legacy setup */
582 tbl
->ant_type
= (ant_msk
>> RATE_MCS_ANT_POS
);
583 tbl
->lq_type
= LQ_NONE
;
584 tbl
->max_search
= IWL_MAX_SEARCH
;
586 /* legacy rate format */
587 if (!(rate_n_flags
& RATE_MCS_HT_MSK
)) {
588 if (num_of_ant
== 1) {
589 if (band
== IEEE80211_BAND_5GHZ
)
596 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
599 if ((rate_n_flags
& RATE_MCS_FAT_MSK
) ||
600 (rate_n_flags
& RATE_MCS_DUP_MSK
))
603 if (rate_n_flags
& RATE_MCS_DUP_MSK
)
606 mcs
= rs_extract_rate(rate_n_flags
);
609 if (mcs
<= IWL_RATE_SISO_60M_PLCP
) {
611 tbl
->lq_type
= LQ_SISO
; /*else NONE*/
613 } else if (mcs
<= IWL_RATE_MIMO2_60M_PLCP
) {
615 tbl
->lq_type
= LQ_MIMO2
;
618 if (num_of_ant
== 3) {
619 tbl
->max_search
= IWL_MAX_11N_MIMO3_SEARCH
;
620 tbl
->lq_type
= LQ_MIMO3
;
627 /* switch to another antenna/antennas and return 1 */
628 /* if no other valid antenna found, return 0 */
629 static int rs_toggle_antenna(u32 valid_ant
, u32
*rate_n_flags
,
630 struct iwl_scale_tbl_info
*tbl
)
634 if (!tbl
->ant_type
|| tbl
->ant_type
> ANT_ABC
)
637 if (!rs_is_valid_ant(valid_ant
, tbl
->ant_type
))
640 new_ant_type
= ant_toggle_lookup
[tbl
->ant_type
];
642 while ((new_ant_type
!= tbl
->ant_type
) &&
643 !rs_is_valid_ant(valid_ant
, new_ant_type
))
644 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
646 if (new_ant_type
== tbl
->ant_type
)
649 tbl
->ant_type
= new_ant_type
;
650 *rate_n_flags
&= ~RATE_MCS_ANT_ABC_MSK
;
651 *rate_n_flags
|= new_ant_type
<< RATE_MCS_ANT_POS
;
655 /* in 4965 we don't use greenfield at all */
656 static inline u8
rs_use_green(struct iwl_priv
*priv
,
657 struct ieee80211_conf
*conf
)
661 if ((priv
->hw_rev
& CSR_HW_REV_TYPE_MSK
) == CSR_HW_REV_TYPE_4965
)
664 is_green
= (conf_is_ht(conf
) &&
665 priv
->current_ht_config
.is_green_field
&&
666 !priv
->current_ht_config
.non_GF_STA_present
);
671 * rs_get_supported_rates - get the available rates
673 * if management frame or broadcast frame only return
674 * basic available rates.
677 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
678 struct ieee80211_hdr
*hdr
,
679 enum iwl_table_type rate_type
)
681 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
682 lq_sta
->active_rate_basic
)
683 return lq_sta
->active_rate_basic
;
685 if (is_legacy(rate_type
)) {
686 return lq_sta
->active_legacy_rate
;
688 if (is_siso(rate_type
))
689 return lq_sta
->active_siso_rate
;
690 else if (is_mimo2(rate_type
))
691 return lq_sta
->active_mimo2_rate
;
693 return lq_sta
->active_mimo3_rate
;
697 static u16
rs_get_adjacent_rate(struct iwl_priv
*priv
, u8 index
, u16 rate_mask
,
700 u8 high
= IWL_RATE_INVALID
;
701 u8 low
= IWL_RATE_INVALID
;
703 /* 802.11A or ht walks to the next literal adjacent rate in
705 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
709 /* Find the previous rate that is in the rate mask */
711 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
712 if (rate_mask
& mask
) {
718 /* Find the next rate that is in the rate mask */
720 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
721 if (rate_mask
& mask
) {
727 return (high
<< 8) | low
;
731 while (low
!= IWL_RATE_INVALID
) {
732 low
= iwl_rates
[low
].prev_rs
;
733 if (low
== IWL_RATE_INVALID
)
735 if (rate_mask
& (1 << low
))
737 IWL_DEBUG_RATE(priv
, "Skipping masked lower rate: %d\n", low
);
741 while (high
!= IWL_RATE_INVALID
) {
742 high
= iwl_rates
[high
].next_rs
;
743 if (high
== IWL_RATE_INVALID
)
745 if (rate_mask
& (1 << high
))
747 IWL_DEBUG_RATE(priv
, "Skipping masked higher rate: %d\n", high
);
750 return (high
<< 8) | low
;
753 static u32
rs_get_lower_rate(struct iwl_lq_sta
*lq_sta
,
754 struct iwl_scale_tbl_info
*tbl
,
755 u8 scale_index
, u8 ht_possible
)
760 u8 switch_to_legacy
= 0;
761 u8 is_green
= lq_sta
->is_green
;
763 /* check if we need to switch from HT to legacy rates.
764 * assumption is that mandatory rates (1Mbps or 6Mbps)
765 * are always supported (spec demand) */
766 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
767 switch_to_legacy
= 1;
768 scale_index
= rs_ht_to_legacy
[scale_index
];
769 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
774 if (num_of_ant(tbl
->ant_type
) > 1)
775 tbl
->ant_type
= ANT_A
;/*FIXME:RS*/
779 tbl
->max_search
= IWL_MAX_SEARCH
;
782 rate_mask
= rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
);
784 /* Mask with station rate restriction */
785 if (is_legacy(tbl
->lq_type
)) {
786 /* supp_rates has no CCK bits in A mode */
787 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
788 rate_mask
= (u16
)(rate_mask
&
789 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
791 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
794 /* If we switched from HT to legacy, check current rate */
795 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
800 high_low
= rs_get_adjacent_rate(lq_sta
->drv
, scale_index
, rate_mask
,
802 low
= high_low
& 0xff;
804 if (low
== IWL_RATE_INVALID
)
808 return rate_n_flags_from_tbl(lq_sta
->drv
, tbl
, low
, is_green
);
812 * mac80211 sends us Tx status
814 static void rs_tx_status(void *priv_r
, struct ieee80211_supported_band
*sband
,
815 struct ieee80211_sta
*sta
, void *priv_sta
,
820 int rs_index
, index
= 0;
821 struct iwl_lq_sta
*lq_sta
= priv_sta
;
822 struct iwl_link_quality_cmd
*table
;
823 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
824 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
825 struct ieee80211_hw
*hw
= priv
->hw
;
826 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
827 struct iwl_rate_scale_data
*window
= NULL
;
828 struct iwl_rate_scale_data
*search_win
= NULL
;
830 struct iwl_scale_tbl_info tbl_type
;
831 struct iwl_scale_tbl_info
*curr_tbl
, *search_tbl
;
835 IWL_DEBUG_RATE_LIMIT(priv
, "get frame ack response, update rate scale window\n");
837 if (!ieee80211_is_data(hdr
->frame_control
) ||
838 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
841 /* This packet was aggregated but doesn't carry rate scale info */
842 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
843 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
846 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
)
849 retries
= info
->status
.rates
[0].count
- 1;
854 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
855 !lq_sta
->ibss_sta_added
)
859 active_index
= lq_sta
->active_tbl
;
861 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
862 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
863 window
= (struct iwl_rate_scale_data
*)&(curr_tbl
->win
[0]);
864 search_win
= (struct iwl_rate_scale_data
*)&(search_tbl
->win
[0]);
867 * Ignore this Tx frame response if its initial rate doesn't match
868 * that of latest Link Quality command. There may be stragglers
869 * from a previous Link Quality command, but we're no longer interested
870 * in those; they're either from the "active" mode while we're trying
871 * to check "search" mode, or a prior "search" mode after we've moved
872 * to a new "search" mode (which might become the new "active" mode).
874 tx_rate
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
875 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
876 if (priv
->band
== IEEE80211_BAND_5GHZ
)
877 rs_index
-= IWL_FIRST_OFDM_RATE
;
879 if ((info
->status
.rates
[0].idx
< 0) ||
880 (tbl_type
.is_SGI
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_SHORT_GI
)) ||
881 (tbl_type
.is_fat
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_40_MHZ_WIDTH
)) ||
882 (tbl_type
.is_dup
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_DUP_DATA
)) ||
883 (tbl_type
.ant_type
!= info
->antenna_sel_tx
) ||
884 (!!(tx_rate
& RATE_MCS_HT_MSK
) != !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) ||
885 (!!(tx_rate
& RATE_MCS_GF_MSK
) != !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_GREEN_FIELD
)) ||
886 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
887 hw
->wiphy
->bands
[info
->band
]->bitrates
[info
->status
.rates
[0].idx
].bitrate
)) {
888 IWL_DEBUG_RATE(priv
, "initial rate does not match 0x%x\n", tx_rate
);
889 /* the last LQ command could failed so the LQ in ucode not
890 * the same in driver sync up
892 lq_sta
->missed_rate_counter
++;
893 if (lq_sta
->missed_rate_counter
> IWL_MISSED_RATE_MAX
) {
894 lq_sta
->missed_rate_counter
= 0;
895 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
900 lq_sta
->missed_rate_counter
= 0;
901 /* Update frame history window with "failure" for each Tx retry. */
903 /* Look up the rate and other info used for each tx attempt.
904 * Each tx attempt steps one entry deeper in the rate table. */
905 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
906 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
,
907 &tbl_type
, &rs_index
);
909 /* If type matches "search" table,
910 * add failure to "search" history */
911 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
912 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
913 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
914 if (search_tbl
->expected_tpt
)
915 tpt
= search_tbl
->expected_tpt
[rs_index
];
918 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
920 /* Else if type matches "current/active" table,
921 * add failure to "current/active" history */
922 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
923 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
924 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
925 if (curr_tbl
->expected_tpt
)
926 tpt
= curr_tbl
->expected_tpt
[rs_index
];
929 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
932 /* If not searching for a new mode, increment failed counter
933 * ... this helps determine when to start searching again */
934 if (lq_sta
->stay_in_tbl
)
935 lq_sta
->total_failed
++;
942 * Find (by rate) the history window to update with final Tx attempt;
943 * if Tx was successful first try, use original rate,
944 * else look up the rate that was, finally, successful.
946 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
947 lq_sta
->last_rate_n_flags
= tx_rate
;
948 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
950 /* Update frame history window with "success" if Tx got ACKed ... */
951 status
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
953 /* If type matches "search" table,
954 * add final tx status to "search" history */
955 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
956 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
957 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
958 if (search_tbl
->expected_tpt
)
959 tpt
= search_tbl
->expected_tpt
[rs_index
];
962 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
)
963 rs_collect_tx_data(search_win
, rs_index
, tpt
,
964 info
->status
.ampdu_ack_len
,
965 info
->status
.ampdu_ack_map
);
967 rs_collect_tx_data(search_win
, rs_index
, tpt
,
969 /* Else if type matches "current/active" table,
970 * add final tx status to "current/active" history */
971 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
972 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
973 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
974 if (curr_tbl
->expected_tpt
)
975 tpt
= curr_tbl
->expected_tpt
[rs_index
];
978 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
)
979 rs_collect_tx_data(window
, rs_index
, tpt
,
980 info
->status
.ampdu_ack_len
,
981 info
->status
.ampdu_ack_map
);
983 rs_collect_tx_data(window
, rs_index
, tpt
,
987 /* If not searching for new mode, increment success/failed counter
988 * ... these help determine when to start searching again */
989 if (lq_sta
->stay_in_tbl
) {
990 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
) {
991 lq_sta
->total_success
+= info
->status
.ampdu_ack_map
;
992 lq_sta
->total_failed
+=
993 (info
->status
.ampdu_ack_len
- info
->status
.ampdu_ack_map
);
996 lq_sta
->total_success
++;
998 lq_sta
->total_failed
++;
1002 /* See if there's a better rate or modulation mode to try. */
1003 if (sta
&& sta
->supp_rates
[sband
->band
])
1004 rs_rate_scale_perform(priv
, skb
, sta
, lq_sta
);
1010 * Begin a period of staying with a selected modulation mode.
1011 * Set "stay_in_tbl" flag to prevent any mode switches.
1012 * Set frame tx success limits according to legacy vs. high-throughput,
1013 * and reset overall (spanning all rates) tx success history statistics.
1014 * These control how long we stay using same modulation mode before
1015 * searching for a new mode.
1017 static void rs_set_stay_in_table(struct iwl_priv
*priv
, u8 is_legacy
,
1018 struct iwl_lq_sta
*lq_sta
)
1020 IWL_DEBUG_RATE(priv
, "we are staying in the same table\n");
1021 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
1023 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
1024 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
1025 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
1027 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
1028 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
1029 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
1031 lq_sta
->table_count
= 0;
1032 lq_sta
->total_failed
= 0;
1033 lq_sta
->total_success
= 0;
1034 lq_sta
->flush_timer
= jiffies
;
1035 lq_sta
->action_counter
= 0;
1039 * Find correct throughput table for given mode of modulation
1041 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1042 struct iwl_scale_tbl_info
*tbl
)
1044 if (is_legacy(tbl
->lq_type
)) {
1045 if (!is_a_band(tbl
->lq_type
))
1046 tbl
->expected_tpt
= expected_tpt_G
;
1048 tbl
->expected_tpt
= expected_tpt_A
;
1049 } else if (is_siso(tbl
->lq_type
)) {
1050 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1052 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
1054 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
1055 else if (tbl
->is_SGI
)
1056 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
1058 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1059 } else if (is_mimo2(tbl
->lq_type
)) {
1060 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1062 tbl
->expected_tpt
= expected_tpt_mimo2_40MHzSGI
;
1064 tbl
->expected_tpt
= expected_tpt_mimo2_40MHz
;
1065 else if (tbl
->is_SGI
)
1066 tbl
->expected_tpt
= expected_tpt_mimo2_20MHzSGI
;
1068 tbl
->expected_tpt
= expected_tpt_mimo2_20MHz
;
1069 } else if (is_mimo3(tbl
->lq_type
)) {
1070 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1072 tbl
->expected_tpt
= expected_tpt_mimo3_40MHzSGI
;
1074 tbl
->expected_tpt
= expected_tpt_mimo3_40MHz
;
1075 else if (tbl
->is_SGI
)
1076 tbl
->expected_tpt
= expected_tpt_mimo3_20MHzSGI
;
1078 tbl
->expected_tpt
= expected_tpt_mimo3_20MHz
;
1080 tbl
->expected_tpt
= expected_tpt_G
;
1084 * Find starting rate for new "search" high-throughput mode of modulation.
1085 * Goal is to find lowest expected rate (under perfect conditions) that is
1086 * above the current measured throughput of "active" mode, to give new mode
1087 * a fair chance to prove itself without too many challenges.
1089 * This gets called when transitioning to more aggressive modulation
1090 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1091 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1092 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1093 * bit rate will typically need to increase, but not if performance was bad.
1095 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1096 struct iwl_lq_sta
*lq_sta
,
1097 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1098 u16 rate_mask
, s8 index
)
1100 /* "active" values */
1101 struct iwl_scale_tbl_info
*active_tbl
=
1102 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1103 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1104 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1106 /* expected "search" throughput */
1107 s32
*tpt_tbl
= tbl
->expected_tpt
;
1109 s32 new_rate
, high
, low
, start_hi
;
1113 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1116 high_low
= rs_get_adjacent_rate(priv
, rate
, rate_mask
,
1119 low
= high_low
& 0xff;
1120 high
= (high_low
>> 8) & 0xff;
1123 * Lower the "search" bit rate, to give new "search" mode
1124 * approximately the same throughput as "active" if:
1126 * 1) "Active" mode has been working modestly well (but not
1127 * great), and expected "search" throughput (under perfect
1128 * conditions) at candidate rate is above the actual
1129 * measured "active" throughput (but less than expected
1130 * "active" throughput under perfect conditions).
1132 * 2) "Active" mode has been working perfectly or very well
1133 * and expected "search" throughput (under perfect
1134 * conditions) at candidate rate is above expected
1135 * "active" throughput (under perfect conditions).
1137 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1138 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1139 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1140 (tpt_tbl
[rate
] <= active_tpt
))) ||
1141 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1142 (tpt_tbl
[rate
] > active_tpt
))) {
1144 /* (2nd or later pass)
1145 * If we've already tried to raise the rate, and are
1146 * now trying to lower it, use the higher rate. */
1147 if (start_hi
!= IWL_RATE_INVALID
) {
1148 new_rate
= start_hi
;
1154 /* Loop again with lower rate */
1155 if (low
!= IWL_RATE_INVALID
)
1158 /* Lower rate not available, use the original */
1162 /* Else try to raise the "search" rate to match "active" */
1164 /* (2nd or later pass)
1165 * If we've already tried to lower the rate, and are
1166 * now trying to raise it, use the lower rate. */
1167 if (new_rate
!= IWL_RATE_INVALID
)
1170 /* Loop again with higher rate */
1171 else if (high
!= IWL_RATE_INVALID
) {
1175 /* Higher rate not available, use the original */
1187 * Set up search table for MIMO2
1189 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1190 struct iwl_lq_sta
*lq_sta
,
1191 struct ieee80211_conf
*conf
,
1192 struct ieee80211_sta
*sta
,
1193 struct iwl_scale_tbl_info
*tbl
, int index
)
1197 s8 is_green
= lq_sta
->is_green
;
1199 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1202 if (((sta
->ht_cap
.cap
& IEEE80211_HT_CAP_SM_PS
) >> 2)
1203 == WLAN_HT_CAP_SM_PS_STATIC
)
1206 /* Need both Tx chains/antennas to support MIMO */
1207 if (priv
->hw_params
.tx_chains_num
< 2)
1210 IWL_DEBUG_RATE(priv
, "LQ: try to switch to MIMO2\n");
1212 tbl
->lq_type
= LQ_MIMO2
;
1213 tbl
->is_dup
= lq_sta
->is_dup
;
1215 tbl
->max_search
= IWL_MAX_SEARCH
;
1216 rate_mask
= lq_sta
->active_mimo2_rate
;
1218 if (iwl_is_fat_tx_allowed(priv
, &sta
->ht_cap
))
1223 /* FIXME: - don't toggle SGI here
1225 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1229 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1235 rs_set_expected_tpt_table(lq_sta
, tbl
);
1237 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1239 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 best rate %d mask %X\n", rate
, rate_mask
);
1240 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1241 IWL_DEBUG_RATE(priv
, "Can't switch with index %d rate mask %x\n",
1245 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1247 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1248 tbl
->current_rate
, is_green
);
1253 * Set up search table for MIMO3
1255 static int rs_switch_to_mimo3(struct iwl_priv
*priv
,
1256 struct iwl_lq_sta
*lq_sta
,
1257 struct ieee80211_conf
*conf
,
1258 struct ieee80211_sta
*sta
,
1259 struct iwl_scale_tbl_info
*tbl
, int index
)
1263 s8 is_green
= lq_sta
->is_green
;
1265 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1268 if (((sta
->ht_cap
.cap
& IEEE80211_HT_CAP_SM_PS
) >> 2)
1269 == WLAN_HT_CAP_SM_PS_STATIC
)
1272 /* Need both Tx chains/antennas to support MIMO */
1273 if (priv
->hw_params
.tx_chains_num
< 3)
1276 IWL_DEBUG_RATE(priv
, "LQ: try to switch to MIMO3\n");
1278 tbl
->lq_type
= LQ_MIMO3
;
1279 tbl
->is_dup
= lq_sta
->is_dup
;
1281 tbl
->max_search
= IWL_MAX_11N_MIMO3_SEARCH
;
1282 rate_mask
= lq_sta
->active_mimo3_rate
;
1284 if (iwl_is_fat_tx_allowed(priv
, &sta
->ht_cap
))
1289 /* FIXME: - don't toggle SGI here
1291 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1295 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1301 rs_set_expected_tpt_table(lq_sta
, tbl
);
1303 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1305 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 best rate %d mask %X\n",
1307 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1308 IWL_DEBUG_RATE(priv
, "Can't switch with index %d rate mask %x\n",
1312 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1314 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1315 tbl
->current_rate
, is_green
);
1320 * Set up search table for SISO
1322 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1323 struct iwl_lq_sta
*lq_sta
,
1324 struct ieee80211_conf
*conf
,
1325 struct ieee80211_sta
*sta
,
1326 struct iwl_scale_tbl_info
*tbl
, int index
)
1329 u8 is_green
= lq_sta
->is_green
;
1332 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1335 IWL_DEBUG_RATE(priv
, "LQ: try to switch to SISO\n");
1337 tbl
->is_dup
= lq_sta
->is_dup
;
1338 tbl
->lq_type
= LQ_SISO
;
1340 tbl
->max_search
= IWL_MAX_SEARCH
;
1341 rate_mask
= lq_sta
->active_siso_rate
;
1343 if (iwl_is_fat_tx_allowed(priv
, &sta
->ht_cap
))
1348 /* FIXME: - don't toggle SGI here
1350 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1354 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1361 tbl
->is_SGI
= 0; /*11n spec: no SGI in SISO+Greenfield*/
1363 rs_set_expected_tpt_table(lq_sta
, tbl
);
1364 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1366 IWL_DEBUG_RATE(priv
, "LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1367 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1368 IWL_DEBUG_RATE(priv
, "can not switch with index %d rate mask %x\n",
1372 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1373 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1374 tbl
->current_rate
, is_green
);
1379 * Try to switch to new modulation mode from legacy
1381 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1382 struct iwl_lq_sta
*lq_sta
,
1383 struct ieee80211_conf
*conf
,
1384 struct ieee80211_sta
*sta
,
1387 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1388 struct iwl_scale_tbl_info
*search_tbl
=
1389 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1390 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1391 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1392 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1393 u8 start_action
= tbl
->action
;
1394 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1395 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1397 u8 update_search_tbl_counter
= 0;
1400 lq_sta
->action_counter
++;
1401 switch (tbl
->action
) {
1402 case IWL_LEGACY_SWITCH_ANTENNA1
:
1403 case IWL_LEGACY_SWITCH_ANTENNA2
:
1404 IWL_DEBUG_RATE(priv
, "LQ: Legacy toggle Antenna\n");
1406 if ((tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA1
&&
1407 tx_chains_num
<= 1) ||
1408 (tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA2
&&
1409 tx_chains_num
<= 2))
1412 /* Don't change antenna if success has been great */
1413 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1416 /* Set up search table to try other antenna */
1417 memcpy(search_tbl
, tbl
, sz
);
1419 if (rs_toggle_antenna(valid_tx_ant
,
1420 &search_tbl
->current_rate
, search_tbl
)) {
1421 update_search_tbl_counter
= 1;
1422 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1426 case IWL_LEGACY_SWITCH_SISO
:
1427 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to SISO\n");
1429 /* Set up search table to try SISO */
1430 memcpy(search_tbl
, tbl
, sz
);
1431 search_tbl
->is_SGI
= 0;
1432 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1435 lq_sta
->action_counter
= 0;
1440 case IWL_LEGACY_SWITCH_MIMO2_AB
:
1441 case IWL_LEGACY_SWITCH_MIMO2_AC
:
1442 case IWL_LEGACY_SWITCH_MIMO2_BC
:
1443 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to MIMO2\n");
1445 /* Set up search table to try MIMO */
1446 memcpy(search_tbl
, tbl
, sz
);
1447 search_tbl
->is_SGI
= 0;
1449 if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AB
)
1450 search_tbl
->ant_type
= ANT_AB
;
1451 else if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AC
)
1452 search_tbl
->ant_type
= ANT_AC
;
1454 search_tbl
->ant_type
= ANT_BC
;
1456 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1459 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1462 lq_sta
->action_counter
= 0;
1467 case IWL_LEGACY_SWITCH_MIMO3_ABC
:
1468 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to MIMO3\n");
1470 /* Set up search table to try MIMO3 */
1471 memcpy(search_tbl
, tbl
, sz
);
1472 search_tbl
->is_SGI
= 0;
1474 search_tbl
->ant_type
= ANT_ABC
;
1476 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1479 ret
= rs_switch_to_mimo3(priv
, lq_sta
, conf
, sta
,
1482 lq_sta
->action_counter
= 0;
1488 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO3_ABC
)
1489 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1491 if (tbl
->action
== start_action
)
1495 search_tbl
->lq_type
= LQ_NONE
;
1499 lq_sta
->search_better_tbl
= 1;
1501 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO3_ABC
)
1502 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1503 if (update_search_tbl_counter
)
1504 search_tbl
->action
= tbl
->action
;
1510 * Try to switch to new modulation mode from SISO
1512 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1513 struct iwl_lq_sta
*lq_sta
,
1514 struct ieee80211_conf
*conf
,
1515 struct ieee80211_sta
*sta
, int index
)
1517 u8 is_green
= lq_sta
->is_green
;
1518 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1519 struct iwl_scale_tbl_info
*search_tbl
=
1520 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1521 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1522 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1523 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1524 u8 start_action
= tbl
->action
;
1525 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1526 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1527 u8 update_search_tbl_counter
= 0;
1531 lq_sta
->action_counter
++;
1532 switch (tbl
->action
) {
1533 case IWL_SISO_SWITCH_ANTENNA1
:
1534 case IWL_SISO_SWITCH_ANTENNA2
:
1535 IWL_DEBUG_RATE(priv
, "LQ: SISO toggle Antenna\n");
1537 if ((tbl
->action
== IWL_SISO_SWITCH_ANTENNA1
&&
1538 tx_chains_num
<= 1) ||
1539 (tbl
->action
== IWL_SISO_SWITCH_ANTENNA2
&&
1540 tx_chains_num
<= 2))
1543 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1546 memcpy(search_tbl
, tbl
, sz
);
1547 if (rs_toggle_antenna(valid_tx_ant
,
1548 &search_tbl
->current_rate
, search_tbl
)) {
1549 update_search_tbl_counter
= 1;
1553 case IWL_SISO_SWITCH_MIMO2_AB
:
1554 case IWL_SISO_SWITCH_MIMO2_AC
:
1555 case IWL_SISO_SWITCH_MIMO2_BC
:
1556 IWL_DEBUG_RATE(priv
, "LQ: SISO switch to MIMO2\n");
1557 memcpy(search_tbl
, tbl
, sz
);
1558 search_tbl
->is_SGI
= 0;
1560 if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AB
)
1561 search_tbl
->ant_type
= ANT_AB
;
1562 else if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AC
)
1563 search_tbl
->ant_type
= ANT_AC
;
1565 search_tbl
->ant_type
= ANT_BC
;
1567 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1570 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1575 case IWL_SISO_SWITCH_GI
:
1577 !(priv
->current_ht_config
.sgf
&
1581 !(priv
->current_ht_config
.sgf
&
1585 IWL_DEBUG_RATE(priv
, "LQ: SISO toggle SGI/NGI\n");
1587 memcpy(search_tbl
, tbl
, sz
);
1593 "SGI was set in GF+SISO\n");
1595 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1596 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1598 s32 tpt
= lq_sta
->last_tpt
/ 100;
1599 if (tpt
>= search_tbl
->expected_tpt
[index
])
1602 search_tbl
->current_rate
=
1603 rate_n_flags_from_tbl(priv
, search_tbl
,
1605 update_search_tbl_counter
= 1;
1607 case IWL_SISO_SWITCH_MIMO3_ABC
:
1608 IWL_DEBUG_RATE(priv
, "LQ: SISO switch to MIMO3\n");
1609 memcpy(search_tbl
, tbl
, sz
);
1610 search_tbl
->is_SGI
= 0;
1611 search_tbl
->ant_type
= ANT_ABC
;
1613 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1616 ret
= rs_switch_to_mimo3(priv
, lq_sta
, conf
, sta
,
1623 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO3_ABC
)
1624 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1626 if (tbl
->action
== start_action
)
1629 search_tbl
->lq_type
= LQ_NONE
;
1633 lq_sta
->search_better_tbl
= 1;
1635 if (tbl
->action
> IWL_SISO_SWITCH_MIMO3_ABC
)
1636 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1637 if (update_search_tbl_counter
)
1638 search_tbl
->action
= tbl
->action
;
1644 * Try to switch to new modulation mode from MIMO2
1646 static int rs_move_mimo2_to_other(struct iwl_priv
*priv
,
1647 struct iwl_lq_sta
*lq_sta
,
1648 struct ieee80211_conf
*conf
,
1649 struct ieee80211_sta
*sta
, int index
)
1651 s8 is_green
= lq_sta
->is_green
;
1652 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1653 struct iwl_scale_tbl_info
*search_tbl
=
1654 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1655 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1656 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1657 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1658 u8 start_action
= tbl
->action
;
1659 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1660 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1661 u8 update_search_tbl_counter
= 0;
1665 lq_sta
->action_counter
++;
1666 switch (tbl
->action
) {
1667 case IWL_MIMO2_SWITCH_ANTENNA1
:
1668 case IWL_MIMO2_SWITCH_ANTENNA2
:
1669 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 toggle Antennas\n");
1671 if (tx_chains_num
<= 2)
1674 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1677 memcpy(search_tbl
, tbl
, sz
);
1678 if (rs_toggle_antenna(valid_tx_ant
,
1679 &search_tbl
->current_rate
, search_tbl
)) {
1680 update_search_tbl_counter
= 1;
1684 case IWL_MIMO2_SWITCH_SISO_A
:
1685 case IWL_MIMO2_SWITCH_SISO_B
:
1686 case IWL_MIMO2_SWITCH_SISO_C
:
1687 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 switch to SISO\n");
1689 /* Set up new search table for SISO */
1690 memcpy(search_tbl
, tbl
, sz
);
1692 if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_A
)
1693 search_tbl
->ant_type
= ANT_A
;
1694 else if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_B
)
1695 search_tbl
->ant_type
= ANT_B
;
1697 search_tbl
->ant_type
= ANT_C
;
1699 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1702 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1709 case IWL_MIMO2_SWITCH_GI
:
1711 !(priv
->current_ht_config
.sgf
&
1715 !(priv
->current_ht_config
.sgf
&
1719 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 toggle SGI/NGI\n");
1721 /* Set up new search table for MIMO2 */
1722 memcpy(search_tbl
, tbl
, sz
);
1723 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1724 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1726 * If active table already uses the fastest possible
1727 * modulation (dual stream with short guard interval),
1728 * and it's working well, there's no need to look
1729 * for a better type of modulation!
1732 s32 tpt
= lq_sta
->last_tpt
/ 100;
1733 if (tpt
>= search_tbl
->expected_tpt
[index
])
1736 search_tbl
->current_rate
=
1737 rate_n_flags_from_tbl(priv
, search_tbl
,
1739 update_search_tbl_counter
= 1;
1742 case IWL_MIMO2_SWITCH_MIMO3_ABC
:
1743 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 switch to MIMO3\n");
1744 memcpy(search_tbl
, tbl
, sz
);
1745 search_tbl
->is_SGI
= 0;
1746 search_tbl
->ant_type
= ANT_ABC
;
1748 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1751 ret
= rs_switch_to_mimo3(priv
, lq_sta
, conf
, sta
,
1759 if (tbl
->action
> IWL_MIMO2_SWITCH_MIMO3_ABC
)
1760 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1762 if (tbl
->action
== start_action
)
1765 search_tbl
->lq_type
= LQ_NONE
;
1768 lq_sta
->search_better_tbl
= 1;
1770 if (tbl
->action
> IWL_MIMO2_SWITCH_MIMO3_ABC
)
1771 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1772 if (update_search_tbl_counter
)
1773 search_tbl
->action
= tbl
->action
;
1780 * Try to switch to new modulation mode from MIMO3
1782 static int rs_move_mimo3_to_other(struct iwl_priv
*priv
,
1783 struct iwl_lq_sta
*lq_sta
,
1784 struct ieee80211_conf
*conf
,
1785 struct ieee80211_sta
*sta
, int index
)
1787 s8 is_green
= lq_sta
->is_green
;
1788 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1789 struct iwl_scale_tbl_info
*search_tbl
=
1790 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1791 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1792 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1793 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1794 u8 start_action
= tbl
->action
;
1795 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1796 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1798 u8 update_search_tbl_counter
= 0;
1801 lq_sta
->action_counter
++;
1802 switch (tbl
->action
) {
1803 case IWL_MIMO3_SWITCH_ANTENNA1
:
1804 case IWL_MIMO3_SWITCH_ANTENNA2
:
1805 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 toggle Antennas\n");
1807 if (tx_chains_num
<= 3)
1810 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1813 memcpy(search_tbl
, tbl
, sz
);
1814 if (rs_toggle_antenna(valid_tx_ant
,
1815 &search_tbl
->current_rate
, search_tbl
))
1818 case IWL_MIMO3_SWITCH_SISO_A
:
1819 case IWL_MIMO3_SWITCH_SISO_B
:
1820 case IWL_MIMO3_SWITCH_SISO_C
:
1821 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 switch to SISO\n");
1823 /* Set up new search table for SISO */
1824 memcpy(search_tbl
, tbl
, sz
);
1826 if (tbl
->action
== IWL_MIMO3_SWITCH_SISO_A
)
1827 search_tbl
->ant_type
= ANT_A
;
1828 else if (tbl
->action
== IWL_MIMO3_SWITCH_SISO_B
)
1829 search_tbl
->ant_type
= ANT_B
;
1831 search_tbl
->ant_type
= ANT_C
;
1833 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1836 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1843 case IWL_MIMO3_SWITCH_MIMO2_AB
:
1844 case IWL_MIMO3_SWITCH_MIMO2_AC
:
1845 case IWL_MIMO3_SWITCH_MIMO2_BC
:
1846 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 switch to MIMO2\n");
1848 memcpy(search_tbl
, tbl
, sz
);
1849 search_tbl
->is_SGI
= 0;
1850 if (tbl
->action
== IWL_MIMO3_SWITCH_MIMO2_AB
)
1851 search_tbl
->ant_type
= ANT_AB
;
1852 else if (tbl
->action
== IWL_MIMO3_SWITCH_MIMO2_AC
)
1853 search_tbl
->ant_type
= ANT_AC
;
1855 search_tbl
->ant_type
= ANT_BC
;
1857 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1860 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1867 case IWL_MIMO3_SWITCH_GI
:
1869 !(priv
->current_ht_config
.sgf
&
1873 !(priv
->current_ht_config
.sgf
&
1877 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 toggle SGI/NGI\n");
1879 /* Set up new search table for MIMO */
1880 memcpy(search_tbl
, tbl
, sz
);
1881 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1882 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1884 * If active table already uses the fastest possible
1885 * modulation (dual stream with short guard interval),
1886 * and it's working well, there's no need to look
1887 * for a better type of modulation!
1890 s32 tpt
= lq_sta
->last_tpt
/ 100;
1891 if (tpt
>= search_tbl
->expected_tpt
[index
])
1894 search_tbl
->current_rate
=
1895 rate_n_flags_from_tbl(priv
, search_tbl
,
1897 update_search_tbl_counter
= 1;
1901 if (tbl
->action
> IWL_MIMO3_SWITCH_GI
)
1902 tbl
->action
= IWL_MIMO3_SWITCH_ANTENNA1
;
1904 if (tbl
->action
== start_action
)
1907 search_tbl
->lq_type
= LQ_NONE
;
1910 lq_sta
->search_better_tbl
= 1;
1912 if (tbl
->action
> IWL_MIMO3_SWITCH_GI
)
1913 tbl
->action
= IWL_MIMO3_SWITCH_ANTENNA1
;
1914 if (update_search_tbl_counter
)
1915 search_tbl
->action
= tbl
->action
;
1922 * Check whether we should continue using same modulation mode, or
1923 * begin search for a new mode, based on:
1924 * 1) # tx successes or failures while using this mode
1925 * 2) # times calling this function
1926 * 3) elapsed time in this mode (not used, for now)
1928 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
)
1930 struct iwl_scale_tbl_info
*tbl
;
1933 int flush_interval_passed
= 0;
1934 struct iwl_priv
*priv
;
1937 active_tbl
= lq_sta
->active_tbl
;
1939 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1941 /* If we've been disallowing search, see if we should now allow it */
1942 if (lq_sta
->stay_in_tbl
) {
1944 /* Elapsed time using current modulation mode */
1945 if (lq_sta
->flush_timer
)
1946 flush_interval_passed
=
1948 (unsigned long)(lq_sta
->flush_timer
+
1949 IWL_RATE_SCALE_FLUSH_INTVL
));
1952 * Check if we should allow search for new modulation mode.
1953 * If many frames have failed or succeeded, or we've used
1954 * this same modulation for a long time, allow search, and
1955 * reset history stats that keep track of whether we should
1956 * allow a new search. Also (below) reset all bitmaps and
1957 * stats in active history.
1959 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1960 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1961 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1962 && (flush_interval_passed
))) {
1963 IWL_DEBUG_RATE(priv
, "LQ: stay is expired %d %d %d\n:",
1964 lq_sta
->total_failed
,
1965 lq_sta
->total_success
,
1966 flush_interval_passed
);
1968 /* Allow search for new mode */
1969 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1970 lq_sta
->total_failed
= 0;
1971 lq_sta
->total_success
= 0;
1972 lq_sta
->flush_timer
= 0;
1975 * Else if we've used this modulation mode enough repetitions
1976 * (regardless of elapsed time or success/failure), reset
1977 * history bitmaps and rate-specific stats for all rates in
1981 lq_sta
->table_count
++;
1982 if (lq_sta
->table_count
>=
1983 lq_sta
->table_count_limit
) {
1984 lq_sta
->table_count
= 0;
1986 IWL_DEBUG_RATE(priv
, "LQ: stay in table clear win\n");
1987 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1988 rs_rate_scale_clear_window(
1993 /* If transitioning to allow "search", reset all history
1994 * bitmaps and stats in active table (this will become the new
1995 * "search" table). */
1996 if (!lq_sta
->stay_in_tbl
) {
1997 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1998 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2004 * Do rate scaling and search for new modulation mode.
2006 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
2007 struct sk_buff
*skb
,
2008 struct ieee80211_sta
*sta
,
2009 struct iwl_lq_sta
*lq_sta
)
2011 struct ieee80211_hw
*hw
= priv
->hw
;
2012 struct ieee80211_conf
*conf
= &hw
->conf
;
2013 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2014 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2015 int low
= IWL_RATE_INVALID
;
2016 int high
= IWL_RATE_INVALID
;
2019 struct iwl_rate_scale_data
*window
= NULL
;
2020 int current_tpt
= IWL_INVALID_VALUE
;
2021 int low_tpt
= IWL_INVALID_VALUE
;
2022 int high_tpt
= IWL_INVALID_VALUE
;
2024 s8 scale_action
= 0;
2027 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
2028 u16 rate_scale_index_msk
= 0;
2035 u8 tid
= MAX_TID_COUNT
;
2036 struct iwl_tid_data
*tid_data
;
2038 IWL_DEBUG_RATE(priv
, "rate scale calculate new rate for skb\n");
2040 /* Send management frames and NO_ACK data using lowest rate. */
2041 /* TODO: this could probably be improved.. */
2042 if (!ieee80211_is_data(hdr
->frame_control
) ||
2043 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
2046 if (!sta
|| !lq_sta
)
2049 lq_sta
->supp_rates
= sta
->supp_rates
[lq_sta
->band
];
2051 tid
= rs_tl_add_packet(lq_sta
, hdr
);
2054 * Select rate-scale / modulation-mode table to work with in
2055 * the rest of this function: "search" if searching for better
2056 * modulation mode, or "active" if doing rate scaling within a mode.
2058 if (!lq_sta
->search_better_tbl
)
2059 active_tbl
= lq_sta
->active_tbl
;
2061 active_tbl
= 1 - lq_sta
->active_tbl
;
2063 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2064 if (is_legacy(tbl
->lq_type
))
2065 lq_sta
->is_green
= 0;
2067 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2068 is_green
= lq_sta
->is_green
;
2070 /* current tx rate */
2071 index
= lq_sta
->last_txrate_idx
;
2073 IWL_DEBUG_RATE(priv
, "Rate scale index %d for type %d\n", index
,
2076 /* rates available for this association, and for modulation mode */
2077 rate_mask
= rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
);
2079 IWL_DEBUG_RATE(priv
, "mask 0x%04X \n", rate_mask
);
2081 /* mask with station rate restriction */
2082 if (is_legacy(tbl
->lq_type
)) {
2083 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2084 /* supp_rates has no CCK bits in A mode */
2085 rate_scale_index_msk
= (u16
) (rate_mask
&
2086 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
2088 rate_scale_index_msk
= (u16
) (rate_mask
&
2089 lq_sta
->supp_rates
);
2092 rate_scale_index_msk
= rate_mask
;
2094 if (!rate_scale_index_msk
)
2095 rate_scale_index_msk
= rate_mask
;
2097 if (!((1 << index
) & rate_scale_index_msk
)) {
2098 IWL_ERR(priv
, "Current Rate is not valid\n");
2102 /* Get expected throughput table and history window for current rate */
2103 if (!tbl
->expected_tpt
) {
2104 IWL_ERR(priv
, "tbl->expected_tpt is NULL\n");
2108 /* force user max rate if set by user */
2109 if ((lq_sta
->max_rate_idx
!= -1) &&
2110 (lq_sta
->max_rate_idx
< index
)) {
2111 index
= lq_sta
->max_rate_idx
;
2113 window
= &(tbl
->win
[index
]);
2117 window
= &(tbl
->win
[index
]);
2120 * If there is not enough history to calculate actual average
2121 * throughput, keep analyzing results of more tx frames, without
2122 * changing rate or mode (bypass most of the rest of this function).
2123 * Set up new rate table in uCode only if old rate is not supported
2124 * in current association (use new rate found above).
2126 fail_count
= window
->counter
- window
->success_counter
;
2127 if ((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
2128 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
)) {
2129 IWL_DEBUG_RATE(priv
, "LQ: still below TH. succ=%d total=%d "
2131 window
->success_counter
, window
->counter
, index
);
2133 /* Can't calculate this yet; not enough history */
2134 window
->average_tpt
= IWL_INVALID_VALUE
;
2136 /* Should we stay with this modulation mode,
2137 * or search for a new one? */
2138 rs_stay_in_table(lq_sta
);
2143 /* Else we have enough samples; calculate estimate of
2144 * actual average throughput */
2146 BUG_ON(window
->average_tpt
!= ((window
->success_ratio
*
2147 tbl
->expected_tpt
[index
] + 64) / 128));
2149 /* If we are searching for better modulation mode, check success. */
2150 if (lq_sta
->search_better_tbl
) {
2152 /* If good success, continue using the "search" mode;
2153 * no need to send new link quality command, since we're
2154 * continuing to use the setup that we've been trying. */
2155 if (window
->average_tpt
> lq_sta
->last_tpt
) {
2157 IWL_DEBUG_RATE(priv
, "LQ: SWITCHING TO NEW TABLE "
2158 "suc=%d cur-tpt=%d old-tpt=%d\n",
2159 window
->success_ratio
,
2160 window
->average_tpt
,
2163 if (!is_legacy(tbl
->lq_type
))
2164 lq_sta
->enable_counter
= 1;
2166 /* Swap tables; "search" becomes "active" */
2167 lq_sta
->active_tbl
= active_tbl
;
2168 current_tpt
= window
->average_tpt
;
2170 /* Else poor success; go back to mode in "active" table */
2173 IWL_DEBUG_RATE(priv
, "LQ: GOING BACK TO THE OLD TABLE "
2174 "suc=%d cur-tpt=%d old-tpt=%d\n",
2175 window
->success_ratio
,
2176 window
->average_tpt
,
2179 /* Nullify "search" table */
2180 tbl
->lq_type
= LQ_NONE
;
2182 /* Revert to "active" table */
2183 active_tbl
= lq_sta
->active_tbl
;
2184 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2186 /* Revert to "active" rate and throughput info */
2187 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
2188 current_tpt
= lq_sta
->last_tpt
;
2190 /* Need to set up a new rate table in uCode */
2194 /* Either way, we've made a decision; modulation mode
2195 * search is done, allow rate adjustment next time. */
2196 lq_sta
->search_better_tbl
= 0;
2197 done_search
= 1; /* Don't switch modes below! */
2201 /* (Else) not in search of better modulation mode, try for better
2202 * starting rate, while staying in this mode. */
2203 high_low
= rs_get_adjacent_rate(priv
, index
, rate_scale_index_msk
,
2205 low
= high_low
& 0xff;
2206 high
= (high_low
>> 8) & 0xff;
2208 /* If user set max rate, dont allow higher than user constrain */
2209 if ((lq_sta
->max_rate_idx
!= -1) &&
2210 (lq_sta
->max_rate_idx
< high
))
2211 high
= IWL_RATE_INVALID
;
2213 sr
= window
->success_ratio
;
2215 /* Collect measured throughputs for current and adjacent rates */
2216 current_tpt
= window
->average_tpt
;
2217 if (low
!= IWL_RATE_INVALID
)
2218 low_tpt
= tbl
->win
[low
].average_tpt
;
2219 if (high
!= IWL_RATE_INVALID
)
2220 high_tpt
= tbl
->win
[high
].average_tpt
;
2224 /* Too many failures, decrease rate */
2225 if ((sr
<= IWL_RATE_DECREASE_TH
) || (current_tpt
== 0)) {
2226 IWL_DEBUG_RATE(priv
, "decrease rate because of low success_ratio\n");
2229 /* No throughput measured yet for adjacent rates; try increase. */
2230 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
2231 (high_tpt
== IWL_INVALID_VALUE
)) {
2233 if (high
!= IWL_RATE_INVALID
&& sr
>= IWL_RATE_INCREASE_TH
)
2235 else if (low
!= IWL_RATE_INVALID
)
2239 /* Both adjacent throughputs are measured, but neither one has better
2240 * throughput; we're using the best rate, don't change it! */
2241 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
2242 (high_tpt
!= IWL_INVALID_VALUE
) &&
2243 (low_tpt
< current_tpt
) &&
2244 (high_tpt
< current_tpt
))
2247 /* At least one adjacent rate's throughput is measured,
2248 * and may have better performance. */
2250 /* Higher adjacent rate's throughput is measured */
2251 if (high_tpt
!= IWL_INVALID_VALUE
) {
2252 /* Higher rate has better throughput */
2253 if (high_tpt
> current_tpt
&&
2254 sr
>= IWL_RATE_INCREASE_TH
) {
2260 /* Lower adjacent rate's throughput is measured */
2261 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
2262 /* Lower rate has better throughput */
2263 if (low_tpt
> current_tpt
) {
2264 IWL_DEBUG_RATE(priv
,
2265 "decrease rate because of low tpt\n");
2267 } else if (sr
>= IWL_RATE_INCREASE_TH
) {
2273 /* Sanity check; asked for decrease, but success rate or throughput
2274 * has been good at old rate. Don't change it. */
2275 if ((scale_action
== -1) && (low
!= IWL_RATE_INVALID
) &&
2276 ((sr
> IWL_RATE_HIGH_TH
) ||
2277 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
2280 switch (scale_action
) {
2282 /* Decrease starting rate, update uCode's rate table */
2283 if (low
!= IWL_RATE_INVALID
) {
2290 /* Increase starting rate, update uCode's rate table */
2291 if (high
!= IWL_RATE_INVALID
) {
2303 IWL_DEBUG_RATE(priv
, "choose rate scale index %d action %d low %d "
2304 "high %d type %d\n",
2305 index
, scale_action
, low
, high
, tbl
->lq_type
);
2308 /* Replace uCode's rate table for the destination station. */
2310 rate
= rate_n_flags_from_tbl(priv
, tbl
, index
, is_green
);
2311 rs_fill_link_cmd(priv
, lq_sta
, rate
);
2312 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2315 /* Should we stay with this modulation mode, or search for a new one? */
2316 rs_stay_in_table(lq_sta
);
2319 * Search for new modulation mode if we're:
2320 * 1) Not changing rates right now
2321 * 2) Not just finishing up a search
2322 * 3) Allowing a new search
2324 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
&& window
->counter
) {
2325 /* Save current throughput to compare with "search" throughput*/
2326 lq_sta
->last_tpt
= current_tpt
;
2328 /* Select a new "search" modulation mode to try.
2329 * If one is found, set up the new "search" table. */
2330 if (is_legacy(tbl
->lq_type
))
2331 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
2332 else if (is_siso(tbl
->lq_type
))
2333 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
2334 else if (is_mimo2(tbl
->lq_type
))
2335 rs_move_mimo2_to_other(priv
, lq_sta
, conf
, sta
, index
);
2337 rs_move_mimo3_to_other(priv
, lq_sta
, conf
, sta
, index
);
2339 /* If new "search" mode was selected, set up in uCode table */
2340 if (lq_sta
->search_better_tbl
) {
2341 /* Access the "search" table, clear its history. */
2342 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2343 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2344 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2346 /* Use new "search" start rate */
2347 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
2349 IWL_DEBUG_RATE(priv
, "Switch current mcs: %X index: %d\n",
2350 tbl
->current_rate
, index
);
2351 rs_fill_link_cmd(priv
, lq_sta
, tbl
->current_rate
);
2352 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2357 if (done_search
&& !lq_sta
->stay_in_tbl
) {
2358 /* If the "active" (non-search) mode was legacy,
2359 * and we've tried switching antennas,
2360 * but we haven't been able to try HT modes (not available),
2361 * stay with best antenna legacy modulation for a while
2362 * before next round of mode comparisons. */
2363 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2364 if (is_legacy(tbl1
->lq_type
) && !conf_is_ht(conf
) &&
2365 lq_sta
->action_counter
> tbl1
->max_search
) {
2366 IWL_DEBUG_RATE(priv
, "LQ: STAY in legacy table\n");
2367 rs_set_stay_in_table(priv
, 1, lq_sta
);
2370 /* If we're in an HT mode, and all 3 mode switch actions
2371 * have been tried and compared, stay in this best modulation
2372 * mode for a while before next round of mode comparisons. */
2373 if (lq_sta
->enable_counter
&&
2374 (lq_sta
->action_counter
>= tbl1
->max_search
)) {
2375 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2376 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2377 (tid
!= MAX_TID_COUNT
)) {
2379 &priv
->stations
[lq_sta
->lq
.sta_id
].tid
[tid
];
2380 if (tid_data
->agg
.state
== IWL_AGG_OFF
) {
2381 IWL_DEBUG_RATE(priv
,
2382 "try to aggregate tid %d\n",
2384 rs_tl_turn_on_agg(priv
, tid
,
2388 rs_set_stay_in_table(priv
, 0, lq_sta
);
2393 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, index
, is_green
);
2395 lq_sta
->last_txrate_idx
= i
;
2401 static void rs_initialize_lq(struct iwl_priv
*priv
,
2402 struct ieee80211_conf
*conf
,
2403 struct ieee80211_sta
*sta
,
2404 struct iwl_lq_sta
*lq_sta
)
2406 struct iwl_scale_tbl_info
*tbl
;
2410 u8 use_green
= rs_use_green(priv
, conf
);
2414 if (!sta
|| !lq_sta
)
2417 i
= lq_sta
->last_txrate_idx
;
2419 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2420 (priv
->iw_mode
== NL80211_IFTYPE_ADHOC
))
2423 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2425 if (!lq_sta
->search_better_tbl
)
2426 active_tbl
= lq_sta
->active_tbl
;
2428 active_tbl
= 1 - lq_sta
->active_tbl
;
2430 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2432 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2435 rate
= iwl_rates
[i
].plcp
;
2436 tbl
->ant_type
= first_antenna(valid_tx_ant
);
2437 rate
|= tbl
->ant_type
<< RATE_MCS_ANT_POS
;
2439 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2440 rate
|= RATE_MCS_CCK_MSK
;
2442 rs_get_tbl_info_from_mcs(rate
, priv
->band
, tbl
, &rate_idx
);
2443 if (!rs_is_valid_ant(valid_tx_ant
, tbl
->ant_type
))
2444 rs_toggle_antenna(valid_tx_ant
, &rate
, tbl
);
2446 rate
= rate_n_flags_from_tbl(priv
, tbl
, rate_idx
, use_green
);
2447 tbl
->current_rate
= rate
;
2448 rs_set_expected_tpt_table(lq_sta
, tbl
);
2449 rs_fill_link_cmd(NULL
, lq_sta
, rate
);
2450 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2455 static void rs_get_rate(void *priv_r
, struct ieee80211_sta
*sta
, void *priv_sta
,
2456 struct ieee80211_tx_rate_control
*txrc
)
2459 struct sk_buff
*skb
= txrc
->skb
;
2460 struct ieee80211_supported_band
*sband
= txrc
->sband
;
2461 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2462 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2463 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2464 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2465 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2469 IWL_DEBUG_RATE_LIMIT(priv
, "rate scale calculate new rate for skb\n");
2471 /* Get max rate if user set max rate */
2473 lq_sta
->max_rate_idx
= txrc
->max_rate_idx
;
2474 if ((sband
->band
== IEEE80211_BAND_5GHZ
) &&
2475 (lq_sta
->max_rate_idx
!= -1))
2476 lq_sta
->max_rate_idx
+= IWL_FIRST_OFDM_RATE
;
2477 if ((lq_sta
->max_rate_idx
< 0) ||
2478 (lq_sta
->max_rate_idx
>= IWL_RATE_COUNT
))
2479 lq_sta
->max_rate_idx
= -1;
2483 mask_bit
= sta
->supp_rates
[sband
->band
];
2485 /* Send management frames and NO_ACK data using lowest rate. */
2486 if (!ieee80211_is_data(hdr
->frame_control
) ||
2487 info
->flags
& IEEE80211_TX_CTL_NO_ACK
|| !sta
|| !lq_sta
) {
2489 info
->control
.rates
[0].idx
=
2490 rate_lowest_index(sband
, NULL
);
2492 info
->control
.rates
[0].idx
=
2493 rate_lowest_index(sband
, sta
);
2494 if (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
2495 info
->control
.rates
[0].count
= 1;
2499 rate_idx
= lq_sta
->last_txrate_idx
;
2501 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
2502 !lq_sta
->ibss_sta_added
) {
2503 u8 sta_id
= priv
->cfg
->ops
->smgmt
->find_station(priv
,
2506 if (sta_id
== IWL_INVALID_STATION
) {
2507 IWL_DEBUG_RATE(priv
, "LQ: ADD station %pM\n",
2509 sta_id
= priv
->cfg
->ops
->smgmt
->add_station(priv
,
2513 if ((sta_id
!= IWL_INVALID_STATION
)) {
2514 lq_sta
->lq
.sta_id
= sta_id
;
2515 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2516 lq_sta
->ibss_sta_added
= 1;
2517 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2521 if (rate_idx
< 0 || rate_idx
> IWL_RATE_COUNT
)
2522 rate_idx
= rate_lowest_index(sband
, sta
);
2523 else if (sband
->band
== IEEE80211_BAND_5GHZ
)
2524 rate_idx
-= IWL_FIRST_OFDM_RATE
;
2526 info
->control
.rates
[0].idx
= rate_idx
;
2529 static void *rs_alloc_sta(void *priv_rate
, struct ieee80211_sta
*sta
,
2532 struct iwl_lq_sta
*lq_sta
;
2533 struct iwl_priv
*priv
;
2536 priv
= (struct iwl_priv
*)priv_rate
;
2537 IWL_DEBUG_RATE(priv
, "create station rate scale window\n");
2539 lq_sta
= kzalloc(sizeof(struct iwl_lq_sta
), gfp
);
2543 lq_sta
->lq
.sta_id
= 0xff;
2546 for (j
= 0; j
< LQ_SIZE
; j
++)
2547 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2548 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2553 static void rs_rate_init(void *priv_r
, struct ieee80211_supported_band
*sband
,
2554 struct ieee80211_sta
*sta
, void *priv_sta
)
2557 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2558 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2559 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2564 lq_sta
->flush_timer
= 0;
2565 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2566 for (j
= 0; j
< LQ_SIZE
; j
++)
2567 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2568 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2570 IWL_DEBUG_RATE(priv
, "LQ: *** rate scale station global init ***\n");
2571 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2572 * the lowest or the highest rate.. Could consider using RSSI from
2573 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2576 lq_sta
->ibss_sta_added
= 0;
2577 if (priv
->iw_mode
== NL80211_IFTYPE_AP
) {
2578 u8 sta_id
= priv
->cfg
->ops
->smgmt
->find_station(priv
,
2581 /* for IBSS the call are from tasklet */
2582 IWL_DEBUG_RATE(priv
, "LQ: ADD station %pM\n", sta
->addr
);
2584 if (sta_id
== IWL_INVALID_STATION
) {
2585 IWL_DEBUG_RATE(priv
, "LQ: ADD station %pM\n", sta
->addr
);
2586 sta_id
= priv
->cfg
->ops
->smgmt
->add_station(priv
,
2590 if ((sta_id
!= IWL_INVALID_STATION
)) {
2591 lq_sta
->lq
.sta_id
= sta_id
;
2592 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2594 /* FIXME: this is w/a remove it later */
2595 priv
->assoc_station_added
= 1;
2599 lq_sta
->max_rate_idx
= -1;
2600 lq_sta
->missed_rate_counter
= IWL_MISSED_RATE_MAX
;
2601 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2602 lq_sta
->active_legacy_rate
= priv
->active_rate
& ~(0x1000);
2603 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2604 lq_sta
->band
= priv
->band
;
2606 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2607 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2609 lq_sta
->active_siso_rate
= sta
->ht_cap
.mcs
.rx_mask
[0] << 1;
2610 lq_sta
->active_siso_rate
|= sta
->ht_cap
.mcs
.rx_mask
[0] & 0x1;
2611 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2612 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2615 lq_sta
->active_mimo2_rate
= sta
->ht_cap
.mcs
.rx_mask
[1] << 1;
2616 lq_sta
->active_mimo2_rate
|= sta
->ht_cap
.mcs
.rx_mask
[1] & 0x1;
2617 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2618 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2620 lq_sta
->active_mimo3_rate
= sta
->ht_cap
.mcs
.rx_mask
[2] << 1;
2621 lq_sta
->active_mimo3_rate
|= sta
->ht_cap
.mcs
.rx_mask
[2] & 0x1;
2622 lq_sta
->active_mimo3_rate
&= ~((u16
)0x2);
2623 lq_sta
->active_mimo3_rate
<<= IWL_FIRST_OFDM_RATE
;
2625 IWL_DEBUG_RATE(priv
, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2626 lq_sta
->active_siso_rate
,
2627 lq_sta
->active_mimo2_rate
,
2628 lq_sta
->active_mimo3_rate
);
2630 /* These values will be overridden later */
2631 lq_sta
->lq
.general_params
.single_stream_ant_msk
= ANT_A
;
2632 lq_sta
->lq
.general_params
.dual_stream_ant_msk
= ANT_AB
;
2634 /* as default allow aggregation for all tids */
2635 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2638 /* Find highest tx rate supported by hardware and destination station */
2639 mask_bit
= sta
->supp_rates
[sband
->band
];
2640 count
= sband
->n_bitrates
;
2641 if (sband
->band
== IEEE80211_BAND_5GHZ
) {
2642 count
+= IWL_FIRST_OFDM_RATE
;
2643 start_rate
= IWL_FIRST_OFDM_RATE
;
2644 mask_bit
<<= IWL_FIRST_OFDM_RATE
;
2647 mask_bit
= mask_bit
& lq_sta
->active_legacy_rate
;
2648 lq_sta
->last_txrate_idx
= 4;
2649 for (i
= start_rate
; i
< count
; i
++)
2650 if (mask_bit
& BIT(i
))
2651 lq_sta
->last_txrate_idx
= i
;
2653 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2656 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
2657 struct iwl_lq_sta
*lq_sta
, u32 new_rate
)
2659 struct iwl_scale_tbl_info tbl_type
;
2662 int repeat_rate
= 0;
2663 u8 ant_toggle_cnt
= 0;
2664 u8 use_ht_possible
= 1;
2665 u8 valid_tx_ant
= 0;
2666 struct iwl_link_quality_cmd
*lq_cmd
= &lq_sta
->lq
;
2668 /* Override starting rate (index 0) if needed for debug purposes */
2669 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2671 /* Interpret new_rate (rate_n_flags) */
2672 memset(&tbl_type
, 0, sizeof(tbl_type
));
2673 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
,
2674 &tbl_type
, &rate_idx
);
2676 /* How many times should we repeat the initial rate? */
2677 if (is_legacy(tbl_type
.lq_type
)) {
2679 repeat_rate
= IWL_NUMBER_TRY
;
2681 repeat_rate
= IWL_HT_NUMBER_TRY
;
2684 lq_cmd
->general_params
.mimo_delimiter
=
2685 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2687 /* Fill 1st table entry (index 0) */
2688 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2690 if (num_of_ant(tbl_type
.ant_type
) == 1) {
2691 lq_cmd
->general_params
.single_stream_ant_msk
=
2693 } else if (num_of_ant(tbl_type
.ant_type
) == 2) {
2694 lq_cmd
->general_params
.dual_stream_ant_msk
=
2696 } /* otherwise we don't modify the existing value */
2702 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2704 /* Fill rest of rate table */
2705 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2706 /* Repeat initial/next rate.
2707 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2708 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2709 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2710 if (is_legacy(tbl_type
.lq_type
)) {
2711 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2714 rs_toggle_antenna(valid_tx_ant
,
2715 &new_rate
, &tbl_type
))
2719 /* Override next rate if needed for debug purposes */
2720 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2722 /* Fill next table entry */
2723 lq_cmd
->rs_table
[index
].rate_n_flags
=
2724 cpu_to_le32(new_rate
);
2729 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
, &tbl_type
,
2732 /* Indicate to uCode which entries might be MIMO.
2733 * If initial rate was MIMO, this will finally end up
2734 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2735 if (is_mimo(tbl_type
.lq_type
))
2736 lq_cmd
->general_params
.mimo_delimiter
= index
;
2739 new_rate
= rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2742 /* How many times should we repeat the next rate? */
2743 if (is_legacy(tbl_type
.lq_type
)) {
2744 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2747 rs_toggle_antenna(valid_tx_ant
,
2748 &new_rate
, &tbl_type
))
2751 repeat_rate
= IWL_NUMBER_TRY
;
2753 repeat_rate
= IWL_HT_NUMBER_TRY
;
2756 /* Don't allow HT rates after next pass.
2757 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2758 use_ht_possible
= 0;
2760 /* Override next rate if needed for debug purposes */
2761 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2763 /* Fill next table entry */
2764 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2770 lq_cmd
->agg_params
.agg_frame_cnt_limit
= 64;
2771 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2772 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2775 static void *rs_alloc(struct ieee80211_hw
*hw
, struct dentry
*debugfsdir
)
2779 /* rate scale requires free function to be implemented */
2780 static void rs_free(void *priv_rate
)
2785 static void rs_free_sta(void *priv_r
, struct ieee80211_sta
*sta
,
2788 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2789 struct iwl_priv
*priv __maybe_unused
= priv_r
;
2791 IWL_DEBUG_RATE(priv
, "enter\n");
2793 IWL_DEBUG_RATE(priv
, "leave\n");
2797 #ifdef CONFIG_MAC80211_DEBUGFS
2798 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2800 file
->private_data
= inode
->i_private
;
2803 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
2804 u32
*rate_n_flags
, int index
)
2806 struct iwl_priv
*priv
;
2811 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2812 if (lq_sta
->dbg_fixed_rate
) {
2814 ((lq_sta
->dbg_fixed_rate
& RATE_MCS_ANT_ABC_MSK
)
2815 >> RATE_MCS_ANT_POS
);
2816 if ((valid_tx_ant
& ant_sel_tx
) == ant_sel_tx
) {
2817 *rate_n_flags
= lq_sta
->dbg_fixed_rate
;
2818 IWL_DEBUG_RATE(priv
, "Fixed rate ON\n");
2820 lq_sta
->dbg_fixed_rate
= 0;
2822 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2823 ant_sel_tx
, valid_tx_ant
);
2824 IWL_DEBUG_RATE(priv
, "Fixed rate OFF\n");
2827 IWL_DEBUG_RATE(priv
, "Fixed rate OFF\n");
2831 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2832 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2834 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2835 struct iwl_priv
*priv
;
2841 memset(buf
, 0, sizeof(buf
));
2842 buf_size
= min(count
, sizeof(buf
) - 1);
2843 if (copy_from_user(buf
, user_buf
, buf_size
))
2846 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2847 lq_sta
->dbg_fixed_rate
= parsed_rate
;
2849 lq_sta
->dbg_fixed_rate
= 0;
2851 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2852 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2853 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2854 lq_sta
->active_mimo3_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2856 IWL_DEBUG_RATE(priv
, "sta_id %d rate 0x%X\n",
2857 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed_rate
);
2859 if (lq_sta
->dbg_fixed_rate
) {
2860 rs_fill_link_cmd(NULL
, lq_sta
, lq_sta
->dbg_fixed_rate
);
2861 iwl_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2867 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2868 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2876 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2877 struct iwl_priv
*priv
;
2878 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2881 buff
= kmalloc(1024, GFP_KERNEL
);
2885 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2886 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2887 lq_sta
->total_failed
, lq_sta
->total_success
,
2888 lq_sta
->active_legacy_rate
);
2889 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2890 lq_sta
->dbg_fixed_rate
);
2891 desc
+= sprintf(buff
+desc
, "valid_tx_ant %s%s%s\n",
2892 (priv
->hw_params
.valid_tx_ant
& ANT_A
) ? "ANT_A," : "",
2893 (priv
->hw_params
.valid_tx_ant
& ANT_B
) ? "ANT_B," : "",
2894 (priv
->hw_params
.valid_tx_ant
& ANT_C
) ? "ANT_C" : "");
2895 desc
+= sprintf(buff
+desc
, "lq type %s\n",
2896 (is_legacy(tbl
->lq_type
)) ? "legacy" : "HT");
2897 if (is_Ht(tbl
->lq_type
)) {
2898 desc
+= sprintf(buff
+desc
, " %s",
2899 (is_siso(tbl
->lq_type
)) ? "SISO" :
2900 ((is_mimo2(tbl
->lq_type
)) ? "MIMO2" : "MIMO3"));
2901 desc
+= sprintf(buff
+desc
, " %s",
2902 (tbl
->is_fat
) ? "40MHz" : "20MHz");
2903 desc
+= sprintf(buff
+desc
, " %s %s\n", (tbl
->is_SGI
) ? "SGI" : "",
2904 (lq_sta
->is_green
) ? "GF enabled" : "");
2906 desc
+= sprintf(buff
+desc
, "last tx rate=0x%X\n",
2907 lq_sta
->last_rate_n_flags
);
2908 desc
+= sprintf(buff
+desc
, "general:"
2909 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2910 lq_sta
->lq
.general_params
.flags
,
2911 lq_sta
->lq
.general_params
.mimo_delimiter
,
2912 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2913 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2915 desc
+= sprintf(buff
+desc
, "agg:"
2916 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2917 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2918 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2919 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2921 desc
+= sprintf(buff
+desc
,
2922 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2923 lq_sta
->lq
.general_params
.start_rate_index
[0],
2924 lq_sta
->lq
.general_params
.start_rate_index
[1],
2925 lq_sta
->lq
.general_params
.start_rate_index
[2],
2926 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2928 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++) {
2929 index
= iwl_hwrate_to_plcp_idx(
2930 le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2931 if (is_legacy(tbl
->lq_type
)) {
2932 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X %smbps\n",
2933 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
),
2934 iwl_rate_mcs
[index
].mbps
);
2936 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X %smbps (%s)\n",
2937 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
),
2938 iwl_rate_mcs
[index
].mbps
, iwl_rate_mcs
[index
].mcs
);
2942 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2947 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2948 .write
= rs_sta_dbgfs_scale_table_write
,
2949 .read
= rs_sta_dbgfs_scale_table_read
,
2950 .open
= open_file_generic
,
2952 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2953 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2960 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2962 buff
= kmalloc(1024, GFP_KERNEL
);
2966 for (i
= 0; i
< LQ_SIZE
; i
++) {
2967 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d GF=%d\n"
2969 lq_sta
->active_tbl
== i
? "*" : "x",
2970 lq_sta
->lq_info
[i
].lq_type
,
2971 lq_sta
->lq_info
[i
].is_SGI
,
2972 lq_sta
->lq_info
[i
].is_fat
,
2973 lq_sta
->lq_info
[i
].is_dup
,
2975 lq_sta
->lq_info
[i
].current_rate
);
2976 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2977 desc
+= sprintf(buff
+desc
,
2978 "counter=%d success=%d %%=%d\n",
2979 lq_sta
->lq_info
[i
].win
[j
].counter
,
2980 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2981 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2984 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2989 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2990 .read
= rs_sta_dbgfs_stats_table_read
,
2991 .open
= open_file_generic
,
2994 static ssize_t
rs_sta_dbgfs_rate_scale_data_read(struct file
*file
,
2995 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3001 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3002 struct iwl_priv
*priv
;
3003 struct iwl_scale_tbl_info
*tbl
= &lq_sta
->lq_info
[lq_sta
->active_tbl
];
3007 if (is_Ht(tbl
->lq_type
))
3008 desc
+= sprintf(buff
+desc
,
3009 "Bit Rate= %d Mb/s\n",
3010 tbl
->expected_tpt
[lq_sta
->last_txrate_idx
]);
3012 desc
+= sprintf(buff
+desc
,
3013 "Bit Rate= %d Mb/s\n",
3014 iwl_rates
[lq_sta
->last_txrate_idx
].ieee
>> 1);
3015 desc
+= sprintf(buff
+desc
,
3016 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3017 priv
->last_rx_rssi
, priv
->last_rx_noise
);
3018 desc
+= sprintf(buff
+desc
,
3019 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3020 priv
->last_tsf
, priv
->last_beacon_time
);
3022 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3026 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops
= {
3027 .read
= rs_sta_dbgfs_rate_scale_data_read
,
3028 .open
= open_file_generic
,
3031 static void rs_add_debugfs(void *priv
, void *priv_sta
,
3034 struct iwl_lq_sta
*lq_sta
= priv_sta
;
3035 lq_sta
->rs_sta_dbgfs_scale_table_file
=
3036 debugfs_create_file("rate_scale_table", 0600, dir
,
3037 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
3038 lq_sta
->rs_sta_dbgfs_stats_table_file
=
3039 debugfs_create_file("rate_stats_table", 0600, dir
,
3040 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
3041 lq_sta
->rs_sta_dbgfs_rate_scale_data_file
=
3042 debugfs_create_file("rate_scale_data", 0600, dir
,
3043 lq_sta
, &rs_sta_dbgfs_rate_scale_data_ops
);
3044 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
3045 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
3046 &lq_sta
->tx_agg_tid_en
);
3050 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
3052 struct iwl_lq_sta
*lq_sta
= priv_sta
;
3053 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
3054 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
3055 debugfs_remove(lq_sta
->rs_sta_dbgfs_rate_scale_data_file
);
3056 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
3060 static struct rate_control_ops rs_ops
= {
3063 .tx_status
= rs_tx_status
,
3064 .get_rate
= rs_get_rate
,
3065 .rate_init
= rs_rate_init
,
3068 .alloc_sta
= rs_alloc_sta
,
3069 .free_sta
= rs_free_sta
,
3070 #ifdef CONFIG_MAC80211_DEBUGFS
3071 .add_sta_debugfs
= rs_add_debugfs
,
3072 .remove_sta_debugfs
= rs_remove_debugfs
,
3076 int iwlagn_rate_control_register(void)
3078 return ieee80211_rate_control_register(&rs_ops
);
3081 void iwlagn_rate_control_unregister(void)
3083 ieee80211_rate_control_unregister(&rs_ops
);