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 #define MCS_INDEX_PER_STREAM (8)
275 static inline u8
rs_extract_rate(u32 rate_n_flags
)
277 return (u8
)(rate_n_flags
& 0xFF);
280 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data
*window
)
283 window
->success_counter
= 0;
284 window
->success_ratio
= IWL_INVALID_VALUE
;
286 window
->average_tpt
= IWL_INVALID_VALUE
;
290 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
292 return (ant_type
& valid_antenna
) == ant_type
;
296 * removes the old data from the statistics. All data that is older than
297 * TID_MAX_TIME_DIFF, will be deleted.
299 static void rs_tl_rm_old_stats(struct iwl_traffic_load
*tl
, u32 curr_time
)
301 /* The oldest age we want to keep */
302 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
304 while (tl
->queue_count
&&
305 (tl
->time_stamp
< oldest_time
)) {
306 tl
->total
-= tl
->packet_count
[tl
->head
];
307 tl
->packet_count
[tl
->head
] = 0;
308 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
311 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
317 * increment traffic load value for tid and also remove
318 * any old values if passed the certain time period
320 static u8
rs_tl_add_packet(struct iwl_lq_sta
*lq_data
,
321 struct ieee80211_hdr
*hdr
)
323 u32 curr_time
= jiffies_to_msecs(jiffies
);
326 struct iwl_traffic_load
*tl
= NULL
;
329 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
330 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
333 return MAX_TID_COUNT
;
335 tl
= &lq_data
->load
[tid
];
337 curr_time
-= curr_time
% TID_ROUND_VALUE
;
339 /* Happens only for the first packet. Initialize the data */
340 if (!(tl
->queue_count
)) {
342 tl
->time_stamp
= curr_time
;
345 tl
->packet_count
[0] = 1;
346 return MAX_TID_COUNT
;
349 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
350 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
352 /* The history is too long: remove data that is older than */
353 /* TID_MAX_TIME_DIFF */
354 if (index
>= TID_QUEUE_MAX_SIZE
)
355 rs_tl_rm_old_stats(tl
, curr_time
);
357 index
= (tl
->head
+ index
) % TID_QUEUE_MAX_SIZE
;
358 tl
->packet_count
[index
] = tl
->packet_count
[index
] + 1;
359 tl
->total
= tl
->total
+ 1;
361 if ((index
+ 1) > tl
->queue_count
)
362 tl
->queue_count
= index
+ 1;
368 get the traffic load value for tid
370 static u32
rs_tl_get_load(struct iwl_lq_sta
*lq_data
, u8 tid
)
372 u32 curr_time
= jiffies_to_msecs(jiffies
);
375 struct iwl_traffic_load
*tl
= NULL
;
377 if (tid
>= TID_MAX_LOAD_COUNT
)
380 tl
= &(lq_data
->load
[tid
]);
382 curr_time
-= curr_time
% TID_ROUND_VALUE
;
384 if (!(tl
->queue_count
))
387 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
388 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
390 /* The history is too long: remove data that is older than */
391 /* TID_MAX_TIME_DIFF */
392 if (index
>= TID_QUEUE_MAX_SIZE
)
393 rs_tl_rm_old_stats(tl
, curr_time
);
398 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv
*priv
,
399 struct iwl_lq_sta
*lq_data
, u8 tid
,
400 struct ieee80211_sta
*sta
)
402 if (rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
403 IWL_DEBUG_HT(priv
, "Starting Tx agg: STA: %pM tid: %d\n",
405 ieee80211_start_tx_ba_session(priv
->hw
, sta
->addr
, tid
);
409 static void rs_tl_turn_on_agg(struct iwl_priv
*priv
, u8 tid
,
410 struct iwl_lq_sta
*lq_data
,
411 struct ieee80211_sta
*sta
)
413 if ((tid
< TID_MAX_LOAD_COUNT
))
414 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
415 else if (tid
== IWL_AGG_ALL_TID
)
416 for (tid
= 0; tid
< TID_MAX_LOAD_COUNT
; tid
++)
417 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
420 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
422 return !!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
423 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
424 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
);
428 * rs_collect_tx_data - Update the success/failure sliding window
430 * We keep a sliding window of the last 62 packets transmitted
431 * at this rate. window->data contains the bitmask of successful
434 static int rs_collect_tx_data(struct iwl_rate_scale_data
*windows
,
435 int scale_index
, s32 tpt
, int retries
,
438 struct iwl_rate_scale_data
*window
= NULL
;
439 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
442 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
445 /* Select data for current tx bit rate */
446 window
= &(windows
[scale_index
]);
449 * Keep track of only the latest 62 tx frame attempts in this rate's
450 * history window; anything older isn't really relevant any more.
451 * If we have filled up the sliding window, drop the oldest attempt;
452 * if the oldest attempt (highest bit in bitmap) shows "success",
453 * subtract "1" from the success counter (this is the main reason
454 * we keep these bitmaps!).
456 while (retries
> 0) {
457 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
459 /* remove earliest */
460 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
462 if (window
->data
& mask
) {
463 window
->data
&= ~mask
;
464 window
->success_counter
--;
468 /* Increment frames-attempted counter */
471 /* Shift bitmap by one frame (throw away oldest history),
472 * OR in "1", and increment "success" if this
473 * frame was successful. */
476 window
->success_counter
++;
484 /* Calculate current success ratio, avoid divide-by-0! */
485 if (window
->counter
> 0)
486 window
->success_ratio
= 128 * (100 * window
->success_counter
)
489 window
->success_ratio
= IWL_INVALID_VALUE
;
491 fail_count
= window
->counter
- window
->success_counter
;
493 /* Calculate average throughput, if we have enough history. */
494 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
495 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
496 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
498 window
->average_tpt
= IWL_INVALID_VALUE
;
500 /* Tag this window as having been updated */
501 window
->stamp
= jiffies
;
507 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
509 /* FIXME:RS:remove this function and put the flags statically in the table */
510 static u32
rate_n_flags_from_tbl(struct iwl_priv
*priv
,
511 struct iwl_scale_tbl_info
*tbl
,
512 int index
, u8 use_green
)
514 u32 rate_n_flags
= 0;
516 if (is_legacy(tbl
->lq_type
)) {
517 rate_n_flags
= iwl_rates
[index
].plcp
;
518 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
519 rate_n_flags
|= RATE_MCS_CCK_MSK
;
521 } else if (is_Ht(tbl
->lq_type
)) {
522 if (index
> IWL_LAST_OFDM_RATE
) {
523 IWL_ERR(priv
, "Invalid HT rate index %d\n", index
);
524 index
= IWL_LAST_OFDM_RATE
;
526 rate_n_flags
= RATE_MCS_HT_MSK
;
528 if (is_siso(tbl
->lq_type
))
529 rate_n_flags
|= iwl_rates
[index
].plcp_siso
;
530 else if (is_mimo2(tbl
->lq_type
))
531 rate_n_flags
|= iwl_rates
[index
].plcp_mimo2
;
533 rate_n_flags
|= iwl_rates
[index
].plcp_mimo3
;
535 IWL_ERR(priv
, "Invalid tbl->lq_type %d\n", tbl
->lq_type
);
538 rate_n_flags
|= ((tbl
->ant_type
<< RATE_MCS_ANT_POS
) &
539 RATE_MCS_ANT_ABC_MSK
);
541 if (is_Ht(tbl
->lq_type
)) {
544 rate_n_flags
|= RATE_MCS_DUP_MSK
;
546 rate_n_flags
|= RATE_MCS_FAT_MSK
;
549 rate_n_flags
|= RATE_MCS_SGI_MSK
;
552 rate_n_flags
|= RATE_MCS_GF_MSK
;
553 if (is_siso(tbl
->lq_type
) && tbl
->is_SGI
) {
554 rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
555 IWL_ERR(priv
, "GF was set with SGI:SISO\n");
563 * Interpret uCode API's rate_n_flags format,
564 * fill "search" or "active" tx mode table.
566 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags
,
567 enum ieee80211_band band
,
568 struct iwl_scale_tbl_info
*tbl
,
571 u32 ant_msk
= (rate_n_flags
& RATE_MCS_ANT_ABC_MSK
);
572 u8 num_of_ant
= get_num_of_ant_from_rate(rate_n_flags
);
575 *rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
577 if (*rate_idx
== IWL_RATE_INVALID
) {
581 tbl
->is_SGI
= 0; /* default legacy setup */
584 tbl
->ant_type
= (ant_msk
>> RATE_MCS_ANT_POS
);
585 tbl
->lq_type
= LQ_NONE
;
586 tbl
->max_search
= IWL_MAX_SEARCH
;
588 /* legacy rate format */
589 if (!(rate_n_flags
& RATE_MCS_HT_MSK
)) {
590 if (num_of_ant
== 1) {
591 if (band
== IEEE80211_BAND_5GHZ
)
598 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
601 if ((rate_n_flags
& RATE_MCS_FAT_MSK
) ||
602 (rate_n_flags
& RATE_MCS_DUP_MSK
))
605 if (rate_n_flags
& RATE_MCS_DUP_MSK
)
608 mcs
= rs_extract_rate(rate_n_flags
);
611 if (mcs
<= IWL_RATE_SISO_60M_PLCP
) {
613 tbl
->lq_type
= LQ_SISO
; /*else NONE*/
615 } else if (mcs
<= IWL_RATE_MIMO2_60M_PLCP
) {
617 tbl
->lq_type
= LQ_MIMO2
;
620 if (num_of_ant
== 3) {
621 tbl
->max_search
= IWL_MAX_11N_MIMO3_SEARCH
;
622 tbl
->lq_type
= LQ_MIMO3
;
629 /* switch to another antenna/antennas and return 1 */
630 /* if no other valid antenna found, return 0 */
631 static int rs_toggle_antenna(u32 valid_ant
, u32
*rate_n_flags
,
632 struct iwl_scale_tbl_info
*tbl
)
636 if (!tbl
->ant_type
|| tbl
->ant_type
> ANT_ABC
)
639 if (!rs_is_valid_ant(valid_ant
, tbl
->ant_type
))
642 new_ant_type
= ant_toggle_lookup
[tbl
->ant_type
];
644 while ((new_ant_type
!= tbl
->ant_type
) &&
645 !rs_is_valid_ant(valid_ant
, new_ant_type
))
646 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
648 if (new_ant_type
== tbl
->ant_type
)
651 tbl
->ant_type
= new_ant_type
;
652 *rate_n_flags
&= ~RATE_MCS_ANT_ABC_MSK
;
653 *rate_n_flags
|= new_ant_type
<< RATE_MCS_ANT_POS
;
657 /* in 4965 we don't use greenfield at all */
658 static inline u8
rs_use_green(struct iwl_priv
*priv
,
659 struct ieee80211_conf
*conf
)
663 if ((priv
->hw_rev
& CSR_HW_REV_TYPE_MSK
) == CSR_HW_REV_TYPE_4965
)
666 is_green
= (conf_is_ht(conf
) &&
667 priv
->current_ht_config
.is_green_field
&&
668 !priv
->current_ht_config
.non_GF_STA_present
);
673 * rs_get_supported_rates - get the available rates
675 * if management frame or broadcast frame only return
676 * basic available rates.
679 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
680 struct ieee80211_hdr
*hdr
,
681 enum iwl_table_type rate_type
)
683 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
684 lq_sta
->active_rate_basic
)
685 return lq_sta
->active_rate_basic
;
687 if (is_legacy(rate_type
)) {
688 return lq_sta
->active_legacy_rate
;
690 if (is_siso(rate_type
))
691 return lq_sta
->active_siso_rate
;
692 else if (is_mimo2(rate_type
))
693 return lq_sta
->active_mimo2_rate
;
695 return lq_sta
->active_mimo3_rate
;
699 static u16
rs_get_adjacent_rate(struct iwl_priv
*priv
, u8 index
, u16 rate_mask
,
702 u8 high
= IWL_RATE_INVALID
;
703 u8 low
= IWL_RATE_INVALID
;
705 /* 802.11A or ht walks to the next literal adjacent rate in
707 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
711 /* Find the previous rate that is in the rate mask */
713 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
714 if (rate_mask
& mask
) {
720 /* Find the next rate that is in the rate mask */
722 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
723 if (rate_mask
& mask
) {
729 return (high
<< 8) | low
;
733 while (low
!= IWL_RATE_INVALID
) {
734 low
= iwl_rates
[low
].prev_rs
;
735 if (low
== IWL_RATE_INVALID
)
737 if (rate_mask
& (1 << low
))
739 IWL_DEBUG_RATE(priv
, "Skipping masked lower rate: %d\n", low
);
743 while (high
!= IWL_RATE_INVALID
) {
744 high
= iwl_rates
[high
].next_rs
;
745 if (high
== IWL_RATE_INVALID
)
747 if (rate_mask
& (1 << high
))
749 IWL_DEBUG_RATE(priv
, "Skipping masked higher rate: %d\n", high
);
752 return (high
<< 8) | low
;
755 static u32
rs_get_lower_rate(struct iwl_lq_sta
*lq_sta
,
756 struct iwl_scale_tbl_info
*tbl
,
757 u8 scale_index
, u8 ht_possible
)
762 u8 switch_to_legacy
= 0;
763 u8 is_green
= lq_sta
->is_green
;
765 /* check if we need to switch from HT to legacy rates.
766 * assumption is that mandatory rates (1Mbps or 6Mbps)
767 * are always supported (spec demand) */
768 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
769 switch_to_legacy
= 1;
770 scale_index
= rs_ht_to_legacy
[scale_index
];
771 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
776 if (num_of_ant(tbl
->ant_type
) > 1)
777 tbl
->ant_type
= ANT_A
;/*FIXME:RS*/
781 tbl
->max_search
= IWL_MAX_SEARCH
;
784 rate_mask
= rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
);
786 /* Mask with station rate restriction */
787 if (is_legacy(tbl
->lq_type
)) {
788 /* supp_rates has no CCK bits in A mode */
789 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
790 rate_mask
= (u16
)(rate_mask
&
791 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
793 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
796 /* If we switched from HT to legacy, check current rate */
797 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
802 high_low
= rs_get_adjacent_rate(lq_sta
->drv
, scale_index
, rate_mask
,
804 low
= high_low
& 0xff;
806 if (low
== IWL_RATE_INVALID
)
810 return rate_n_flags_from_tbl(lq_sta
->drv
, tbl
, low
, is_green
);
814 * mac80211 sends us Tx status
816 static void rs_tx_status(void *priv_r
, struct ieee80211_supported_band
*sband
,
817 struct ieee80211_sta
*sta
, void *priv_sta
,
822 int rs_index
, index
= 0;
823 struct iwl_lq_sta
*lq_sta
= priv_sta
;
824 struct iwl_link_quality_cmd
*table
;
825 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
826 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
827 struct ieee80211_hw
*hw
= priv
->hw
;
828 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
829 struct iwl_rate_scale_data
*window
= NULL
;
830 struct iwl_rate_scale_data
*search_win
= NULL
;
832 struct iwl_scale_tbl_info tbl_type
;
833 struct iwl_scale_tbl_info
*curr_tbl
, *search_tbl
;
837 IWL_DEBUG_RATE_LIMIT(priv
, "get frame ack response, update rate scale window\n");
839 if (!ieee80211_is_data(hdr
->frame_control
) ||
840 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
843 /* This packet was aggregated but doesn't carry rate scale info */
844 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
845 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
848 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
)
851 retries
= info
->status
.rates
[0].count
- 1;
856 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
857 !lq_sta
->ibss_sta_added
)
861 active_index
= lq_sta
->active_tbl
;
863 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
864 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
865 window
= (struct iwl_rate_scale_data
*)&(curr_tbl
->win
[0]);
866 search_win
= (struct iwl_rate_scale_data
*)&(search_tbl
->win
[0]);
869 * Ignore this Tx frame response if its initial rate doesn't match
870 * that of latest Link Quality command. There may be stragglers
871 * from a previous Link Quality command, but we're no longer interested
872 * in those; they're either from the "active" mode while we're trying
873 * to check "search" mode, or a prior "search" mode after we've moved
874 * to a new "search" mode (which might become the new "active" mode).
876 tx_rate
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
877 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
878 if (priv
->band
== IEEE80211_BAND_5GHZ
)
879 rs_index
-= IWL_FIRST_OFDM_RATE
;
881 if ((info
->status
.rates
[0].idx
< 0) ||
882 (tbl_type
.is_SGI
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_SHORT_GI
)) ||
883 (tbl_type
.is_fat
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_40_MHZ_WIDTH
)) ||
884 (tbl_type
.is_dup
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_DUP_DATA
)) ||
885 (tbl_type
.ant_type
!= info
->antenna_sel_tx
) ||
886 (!!(tx_rate
& RATE_MCS_HT_MSK
) != !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) ||
887 (!!(tx_rate
& RATE_MCS_GF_MSK
) != !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_GREEN_FIELD
)) ||
888 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
889 hw
->wiphy
->bands
[info
->band
]->bitrates
[info
->status
.rates
[0].idx
].bitrate
)) {
890 IWL_DEBUG_RATE(priv
, "initial rate does not match 0x%x\n", tx_rate
);
891 /* the last LQ command could failed so the LQ in ucode not
892 * the same in driver sync up
894 lq_sta
->missed_rate_counter
++;
895 if (lq_sta
->missed_rate_counter
> IWL_MISSED_RATE_MAX
) {
896 lq_sta
->missed_rate_counter
= 0;
897 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
902 lq_sta
->missed_rate_counter
= 0;
903 /* Update frame history window with "failure" for each Tx retry. */
905 /* Look up the rate and other info used for each tx attempt.
906 * Each tx attempt steps one entry deeper in the rate table. */
907 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
908 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
,
909 &tbl_type
, &rs_index
);
911 /* If type matches "search" table,
912 * add failure to "search" history */
913 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
914 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
915 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
916 if (search_tbl
->expected_tpt
)
917 tpt
= search_tbl
->expected_tpt
[rs_index
];
920 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
922 /* Else if type matches "current/active" table,
923 * add failure to "current/active" history */
924 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
925 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
926 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
927 if (curr_tbl
->expected_tpt
)
928 tpt
= curr_tbl
->expected_tpt
[rs_index
];
931 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
934 /* If not searching for a new mode, increment failed counter
935 * ... this helps determine when to start searching again */
936 if (lq_sta
->stay_in_tbl
)
937 lq_sta
->total_failed
++;
944 * Find (by rate) the history window to update with final Tx attempt;
945 * if Tx was successful first try, use original rate,
946 * else look up the rate that was, finally, successful.
948 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
949 lq_sta
->last_rate_n_flags
= tx_rate
;
950 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
952 /* Update frame history window with "success" if Tx got ACKed ... */
953 status
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
955 /* If type matches "search" table,
956 * add final tx status to "search" history */
957 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
958 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
959 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
960 if (search_tbl
->expected_tpt
)
961 tpt
= search_tbl
->expected_tpt
[rs_index
];
964 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
)
965 rs_collect_tx_data(search_win
, rs_index
, tpt
,
966 info
->status
.ampdu_ack_len
,
967 info
->status
.ampdu_ack_map
);
969 rs_collect_tx_data(search_win
, rs_index
, tpt
,
971 /* Else if type matches "current/active" table,
972 * add final tx status to "current/active" history */
973 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
974 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
975 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
976 if (curr_tbl
->expected_tpt
)
977 tpt
= curr_tbl
->expected_tpt
[rs_index
];
980 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
)
981 rs_collect_tx_data(window
, rs_index
, tpt
,
982 info
->status
.ampdu_ack_len
,
983 info
->status
.ampdu_ack_map
);
985 rs_collect_tx_data(window
, rs_index
, tpt
,
989 /* If not searching for new mode, increment success/failed counter
990 * ... these help determine when to start searching again */
991 if (lq_sta
->stay_in_tbl
) {
992 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
) {
993 lq_sta
->total_success
+= info
->status
.ampdu_ack_map
;
994 lq_sta
->total_failed
+=
995 (info
->status
.ampdu_ack_len
- info
->status
.ampdu_ack_map
);
998 lq_sta
->total_success
++;
1000 lq_sta
->total_failed
++;
1004 /* See if there's a better rate or modulation mode to try. */
1005 if (sta
&& sta
->supp_rates
[sband
->band
])
1006 rs_rate_scale_perform(priv
, skb
, sta
, lq_sta
);
1012 * Begin a period of staying with a selected modulation mode.
1013 * Set "stay_in_tbl" flag to prevent any mode switches.
1014 * Set frame tx success limits according to legacy vs. high-throughput,
1015 * and reset overall (spanning all rates) tx success history statistics.
1016 * These control how long we stay using same modulation mode before
1017 * searching for a new mode.
1019 static void rs_set_stay_in_table(struct iwl_priv
*priv
, u8 is_legacy
,
1020 struct iwl_lq_sta
*lq_sta
)
1022 IWL_DEBUG_RATE(priv
, "we are staying in the same table\n");
1023 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
1025 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
1026 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
1027 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
1029 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
1030 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
1031 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
1033 lq_sta
->table_count
= 0;
1034 lq_sta
->total_failed
= 0;
1035 lq_sta
->total_success
= 0;
1036 lq_sta
->flush_timer
= jiffies
;
1037 lq_sta
->action_counter
= 0;
1041 * Find correct throughput table for given mode of modulation
1043 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1044 struct iwl_scale_tbl_info
*tbl
)
1046 if (is_legacy(tbl
->lq_type
)) {
1047 if (!is_a_band(tbl
->lq_type
))
1048 tbl
->expected_tpt
= expected_tpt_G
;
1050 tbl
->expected_tpt
= expected_tpt_A
;
1051 } else if (is_siso(tbl
->lq_type
)) {
1052 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1054 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
1056 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
1057 else if (tbl
->is_SGI
)
1058 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
1060 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1061 } else if (is_mimo2(tbl
->lq_type
)) {
1062 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1064 tbl
->expected_tpt
= expected_tpt_mimo2_40MHzSGI
;
1066 tbl
->expected_tpt
= expected_tpt_mimo2_40MHz
;
1067 else if (tbl
->is_SGI
)
1068 tbl
->expected_tpt
= expected_tpt_mimo2_20MHzSGI
;
1070 tbl
->expected_tpt
= expected_tpt_mimo2_20MHz
;
1071 } else if (is_mimo3(tbl
->lq_type
)) {
1072 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1074 tbl
->expected_tpt
= expected_tpt_mimo3_40MHzSGI
;
1076 tbl
->expected_tpt
= expected_tpt_mimo3_40MHz
;
1077 else if (tbl
->is_SGI
)
1078 tbl
->expected_tpt
= expected_tpt_mimo3_20MHzSGI
;
1080 tbl
->expected_tpt
= expected_tpt_mimo3_20MHz
;
1082 tbl
->expected_tpt
= expected_tpt_G
;
1086 * Find starting rate for new "search" high-throughput mode of modulation.
1087 * Goal is to find lowest expected rate (under perfect conditions) that is
1088 * above the current measured throughput of "active" mode, to give new mode
1089 * a fair chance to prove itself without too many challenges.
1091 * This gets called when transitioning to more aggressive modulation
1092 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1093 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1094 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1095 * bit rate will typically need to increase, but not if performance was bad.
1097 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1098 struct iwl_lq_sta
*lq_sta
,
1099 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1100 u16 rate_mask
, s8 index
)
1102 /* "active" values */
1103 struct iwl_scale_tbl_info
*active_tbl
=
1104 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1105 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1106 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1108 /* expected "search" throughput */
1109 s32
*tpt_tbl
= tbl
->expected_tpt
;
1111 s32 new_rate
, high
, low
, start_hi
;
1115 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1118 high_low
= rs_get_adjacent_rate(priv
, rate
, rate_mask
,
1121 low
= high_low
& 0xff;
1122 high
= (high_low
>> 8) & 0xff;
1125 * Lower the "search" bit rate, to give new "search" mode
1126 * approximately the same throughput as "active" if:
1128 * 1) "Active" mode has been working modestly well (but not
1129 * great), and expected "search" throughput (under perfect
1130 * conditions) at candidate rate is above the actual
1131 * measured "active" throughput (but less than expected
1132 * "active" throughput under perfect conditions).
1134 * 2) "Active" mode has been working perfectly or very well
1135 * and expected "search" throughput (under perfect
1136 * conditions) at candidate rate is above expected
1137 * "active" throughput (under perfect conditions).
1139 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1140 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1141 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1142 (tpt_tbl
[rate
] <= active_tpt
))) ||
1143 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1144 (tpt_tbl
[rate
] > active_tpt
))) {
1146 /* (2nd or later pass)
1147 * If we've already tried to raise the rate, and are
1148 * now trying to lower it, use the higher rate. */
1149 if (start_hi
!= IWL_RATE_INVALID
) {
1150 new_rate
= start_hi
;
1156 /* Loop again with lower rate */
1157 if (low
!= IWL_RATE_INVALID
)
1160 /* Lower rate not available, use the original */
1164 /* Else try to raise the "search" rate to match "active" */
1166 /* (2nd or later pass)
1167 * If we've already tried to lower the rate, and are
1168 * now trying to raise it, use the lower rate. */
1169 if (new_rate
!= IWL_RATE_INVALID
)
1172 /* Loop again with higher rate */
1173 else if (high
!= IWL_RATE_INVALID
) {
1177 /* Higher rate not available, use the original */
1189 * Set up search table for MIMO2
1191 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1192 struct iwl_lq_sta
*lq_sta
,
1193 struct ieee80211_conf
*conf
,
1194 struct ieee80211_sta
*sta
,
1195 struct iwl_scale_tbl_info
*tbl
, int index
)
1199 s8 is_green
= lq_sta
->is_green
;
1201 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1204 if (((sta
->ht_cap
.cap
& IEEE80211_HT_CAP_SM_PS
) >> 2)
1205 == WLAN_HT_CAP_SM_PS_STATIC
)
1208 /* Need both Tx chains/antennas to support MIMO */
1209 if (priv
->hw_params
.tx_chains_num
< 2)
1212 IWL_DEBUG_RATE(priv
, "LQ: try to switch to MIMO2\n");
1214 tbl
->lq_type
= LQ_MIMO2
;
1215 tbl
->is_dup
= lq_sta
->is_dup
;
1217 tbl
->max_search
= IWL_MAX_SEARCH
;
1218 rate_mask
= lq_sta
->active_mimo2_rate
;
1220 if (iwl_is_fat_tx_allowed(priv
, &sta
->ht_cap
))
1225 /* FIXME: - don't toggle SGI here
1227 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1231 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1237 rs_set_expected_tpt_table(lq_sta
, tbl
);
1239 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1241 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 best rate %d mask %X\n", rate
, rate_mask
);
1242 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1243 IWL_DEBUG_RATE(priv
, "Can't switch with index %d rate mask %x\n",
1247 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1249 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1250 tbl
->current_rate
, is_green
);
1255 * Set up search table for MIMO3
1257 static int rs_switch_to_mimo3(struct iwl_priv
*priv
,
1258 struct iwl_lq_sta
*lq_sta
,
1259 struct ieee80211_conf
*conf
,
1260 struct ieee80211_sta
*sta
,
1261 struct iwl_scale_tbl_info
*tbl
, int index
)
1265 s8 is_green
= lq_sta
->is_green
;
1267 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1270 if (((sta
->ht_cap
.cap
& IEEE80211_HT_CAP_SM_PS
) >> 2)
1271 == WLAN_HT_CAP_SM_PS_STATIC
)
1274 /* Need both Tx chains/antennas to support MIMO */
1275 if (priv
->hw_params
.tx_chains_num
< 3)
1278 IWL_DEBUG_RATE(priv
, "LQ: try to switch to MIMO3\n");
1280 tbl
->lq_type
= LQ_MIMO3
;
1281 tbl
->is_dup
= lq_sta
->is_dup
;
1283 tbl
->max_search
= IWL_MAX_11N_MIMO3_SEARCH
;
1284 rate_mask
= lq_sta
->active_mimo3_rate
;
1286 if (iwl_is_fat_tx_allowed(priv
, &sta
->ht_cap
))
1291 /* FIXME: - don't toggle SGI here
1293 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1297 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1303 rs_set_expected_tpt_table(lq_sta
, tbl
);
1305 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1307 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 best rate %d mask %X\n",
1309 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1310 IWL_DEBUG_RATE(priv
, "Can't switch with index %d rate mask %x\n",
1314 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1316 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1317 tbl
->current_rate
, is_green
);
1322 * Set up search table for SISO
1324 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1325 struct iwl_lq_sta
*lq_sta
,
1326 struct ieee80211_conf
*conf
,
1327 struct ieee80211_sta
*sta
,
1328 struct iwl_scale_tbl_info
*tbl
, int index
)
1331 u8 is_green
= lq_sta
->is_green
;
1334 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1337 IWL_DEBUG_RATE(priv
, "LQ: try to switch to SISO\n");
1339 tbl
->is_dup
= lq_sta
->is_dup
;
1340 tbl
->lq_type
= LQ_SISO
;
1342 tbl
->max_search
= IWL_MAX_SEARCH
;
1343 rate_mask
= lq_sta
->active_siso_rate
;
1345 if (iwl_is_fat_tx_allowed(priv
, &sta
->ht_cap
))
1350 /* FIXME: - don't toggle SGI here
1352 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1356 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1363 tbl
->is_SGI
= 0; /*11n spec: no SGI in SISO+Greenfield*/
1365 rs_set_expected_tpt_table(lq_sta
, tbl
);
1366 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1368 IWL_DEBUG_RATE(priv
, "LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1369 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1370 IWL_DEBUG_RATE(priv
, "can not switch with index %d rate mask %x\n",
1374 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1375 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1376 tbl
->current_rate
, is_green
);
1381 * Try to switch to new modulation mode from legacy
1383 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1384 struct iwl_lq_sta
*lq_sta
,
1385 struct ieee80211_conf
*conf
,
1386 struct ieee80211_sta
*sta
,
1389 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1390 struct iwl_scale_tbl_info
*search_tbl
=
1391 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1392 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1393 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1394 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1395 u8 start_action
= tbl
->action
;
1396 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1397 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1399 u8 update_search_tbl_counter
= 0;
1402 lq_sta
->action_counter
++;
1403 switch (tbl
->action
) {
1404 case IWL_LEGACY_SWITCH_ANTENNA1
:
1405 case IWL_LEGACY_SWITCH_ANTENNA2
:
1406 IWL_DEBUG_RATE(priv
, "LQ: Legacy toggle Antenna\n");
1408 if ((tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA1
&&
1409 tx_chains_num
<= 1) ||
1410 (tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA2
&&
1411 tx_chains_num
<= 2))
1414 /* Don't change antenna if success has been great */
1415 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1418 /* Set up search table to try other antenna */
1419 memcpy(search_tbl
, tbl
, sz
);
1421 if (rs_toggle_antenna(valid_tx_ant
,
1422 &search_tbl
->current_rate
, search_tbl
)) {
1423 update_search_tbl_counter
= 1;
1424 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1428 case IWL_LEGACY_SWITCH_SISO
:
1429 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to SISO\n");
1431 /* Set up search table to try SISO */
1432 memcpy(search_tbl
, tbl
, sz
);
1433 search_tbl
->is_SGI
= 0;
1434 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1437 lq_sta
->action_counter
= 0;
1442 case IWL_LEGACY_SWITCH_MIMO2_AB
:
1443 case IWL_LEGACY_SWITCH_MIMO2_AC
:
1444 case IWL_LEGACY_SWITCH_MIMO2_BC
:
1445 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to MIMO2\n");
1447 /* Set up search table to try MIMO */
1448 memcpy(search_tbl
, tbl
, sz
);
1449 search_tbl
->is_SGI
= 0;
1451 if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AB
)
1452 search_tbl
->ant_type
= ANT_AB
;
1453 else if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AC
)
1454 search_tbl
->ant_type
= ANT_AC
;
1456 search_tbl
->ant_type
= ANT_BC
;
1458 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1461 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1464 lq_sta
->action_counter
= 0;
1469 case IWL_LEGACY_SWITCH_MIMO3_ABC
:
1470 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to MIMO3\n");
1472 /* Set up search table to try MIMO3 */
1473 memcpy(search_tbl
, tbl
, sz
);
1474 search_tbl
->is_SGI
= 0;
1476 search_tbl
->ant_type
= ANT_ABC
;
1478 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1481 ret
= rs_switch_to_mimo3(priv
, lq_sta
, conf
, sta
,
1484 lq_sta
->action_counter
= 0;
1490 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO3_ABC
)
1491 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1493 if (tbl
->action
== start_action
)
1497 search_tbl
->lq_type
= LQ_NONE
;
1501 lq_sta
->search_better_tbl
= 1;
1503 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO3_ABC
)
1504 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1505 if (update_search_tbl_counter
)
1506 search_tbl
->action
= tbl
->action
;
1512 * Try to switch to new modulation mode from SISO
1514 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1515 struct iwl_lq_sta
*lq_sta
,
1516 struct ieee80211_conf
*conf
,
1517 struct ieee80211_sta
*sta
, int index
)
1519 u8 is_green
= lq_sta
->is_green
;
1520 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1521 struct iwl_scale_tbl_info
*search_tbl
=
1522 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1523 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1524 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1525 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1526 u8 start_action
= tbl
->action
;
1527 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1528 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1529 u8 update_search_tbl_counter
= 0;
1533 lq_sta
->action_counter
++;
1534 switch (tbl
->action
) {
1535 case IWL_SISO_SWITCH_ANTENNA1
:
1536 case IWL_SISO_SWITCH_ANTENNA2
:
1537 IWL_DEBUG_RATE(priv
, "LQ: SISO toggle Antenna\n");
1539 if ((tbl
->action
== IWL_SISO_SWITCH_ANTENNA1
&&
1540 tx_chains_num
<= 1) ||
1541 (tbl
->action
== IWL_SISO_SWITCH_ANTENNA2
&&
1542 tx_chains_num
<= 2))
1545 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1548 memcpy(search_tbl
, tbl
, sz
);
1549 if (rs_toggle_antenna(valid_tx_ant
,
1550 &search_tbl
->current_rate
, search_tbl
)) {
1551 update_search_tbl_counter
= 1;
1555 case IWL_SISO_SWITCH_MIMO2_AB
:
1556 case IWL_SISO_SWITCH_MIMO2_AC
:
1557 case IWL_SISO_SWITCH_MIMO2_BC
:
1558 IWL_DEBUG_RATE(priv
, "LQ: SISO switch to MIMO2\n");
1559 memcpy(search_tbl
, tbl
, sz
);
1560 search_tbl
->is_SGI
= 0;
1562 if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AB
)
1563 search_tbl
->ant_type
= ANT_AB
;
1564 else if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AC
)
1565 search_tbl
->ant_type
= ANT_AC
;
1567 search_tbl
->ant_type
= ANT_BC
;
1569 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1572 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1577 case IWL_SISO_SWITCH_GI
:
1579 !(priv
->current_ht_config
.sgf
&
1583 !(priv
->current_ht_config
.sgf
&
1587 IWL_DEBUG_RATE(priv
, "LQ: SISO toggle SGI/NGI\n");
1589 memcpy(search_tbl
, tbl
, sz
);
1595 "SGI was set in GF+SISO\n");
1597 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1598 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1600 s32 tpt
= lq_sta
->last_tpt
/ 100;
1601 if (tpt
>= search_tbl
->expected_tpt
[index
])
1604 search_tbl
->current_rate
=
1605 rate_n_flags_from_tbl(priv
, search_tbl
,
1607 update_search_tbl_counter
= 1;
1609 case IWL_SISO_SWITCH_MIMO3_ABC
:
1610 IWL_DEBUG_RATE(priv
, "LQ: SISO switch to MIMO3\n");
1611 memcpy(search_tbl
, tbl
, sz
);
1612 search_tbl
->is_SGI
= 0;
1613 search_tbl
->ant_type
= ANT_ABC
;
1615 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1618 ret
= rs_switch_to_mimo3(priv
, lq_sta
, conf
, sta
,
1625 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO3_ABC
)
1626 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1628 if (tbl
->action
== start_action
)
1631 search_tbl
->lq_type
= LQ_NONE
;
1635 lq_sta
->search_better_tbl
= 1;
1637 if (tbl
->action
> IWL_SISO_SWITCH_MIMO3_ABC
)
1638 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1639 if (update_search_tbl_counter
)
1640 search_tbl
->action
= tbl
->action
;
1646 * Try to switch to new modulation mode from MIMO2
1648 static int rs_move_mimo2_to_other(struct iwl_priv
*priv
,
1649 struct iwl_lq_sta
*lq_sta
,
1650 struct ieee80211_conf
*conf
,
1651 struct ieee80211_sta
*sta
, int index
)
1653 s8 is_green
= lq_sta
->is_green
;
1654 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1655 struct iwl_scale_tbl_info
*search_tbl
=
1656 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1657 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1658 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1659 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1660 u8 start_action
= tbl
->action
;
1661 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1662 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1663 u8 update_search_tbl_counter
= 0;
1667 lq_sta
->action_counter
++;
1668 switch (tbl
->action
) {
1669 case IWL_MIMO2_SWITCH_ANTENNA1
:
1670 case IWL_MIMO2_SWITCH_ANTENNA2
:
1671 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 toggle Antennas\n");
1673 if (tx_chains_num
<= 2)
1676 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1679 memcpy(search_tbl
, tbl
, sz
);
1680 if (rs_toggle_antenna(valid_tx_ant
,
1681 &search_tbl
->current_rate
, search_tbl
)) {
1682 update_search_tbl_counter
= 1;
1686 case IWL_MIMO2_SWITCH_SISO_A
:
1687 case IWL_MIMO2_SWITCH_SISO_B
:
1688 case IWL_MIMO2_SWITCH_SISO_C
:
1689 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 switch to SISO\n");
1691 /* Set up new search table for SISO */
1692 memcpy(search_tbl
, tbl
, sz
);
1694 if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_A
)
1695 search_tbl
->ant_type
= ANT_A
;
1696 else if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_B
)
1697 search_tbl
->ant_type
= ANT_B
;
1699 search_tbl
->ant_type
= ANT_C
;
1701 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1704 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1711 case IWL_MIMO2_SWITCH_GI
:
1713 !(priv
->current_ht_config
.sgf
&
1717 !(priv
->current_ht_config
.sgf
&
1721 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 toggle SGI/NGI\n");
1723 /* Set up new search table for MIMO2 */
1724 memcpy(search_tbl
, tbl
, sz
);
1725 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1726 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1728 * If active table already uses the fastest possible
1729 * modulation (dual stream with short guard interval),
1730 * and it's working well, there's no need to look
1731 * for a better type of modulation!
1734 s32 tpt
= lq_sta
->last_tpt
/ 100;
1735 if (tpt
>= search_tbl
->expected_tpt
[index
])
1738 search_tbl
->current_rate
=
1739 rate_n_flags_from_tbl(priv
, search_tbl
,
1741 update_search_tbl_counter
= 1;
1744 case IWL_MIMO2_SWITCH_MIMO3_ABC
:
1745 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 switch to MIMO3\n");
1746 memcpy(search_tbl
, tbl
, sz
);
1747 search_tbl
->is_SGI
= 0;
1748 search_tbl
->ant_type
= ANT_ABC
;
1750 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1753 ret
= rs_switch_to_mimo3(priv
, lq_sta
, conf
, sta
,
1761 if (tbl
->action
> IWL_MIMO2_SWITCH_MIMO3_ABC
)
1762 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1764 if (tbl
->action
== start_action
)
1767 search_tbl
->lq_type
= LQ_NONE
;
1770 lq_sta
->search_better_tbl
= 1;
1772 if (tbl
->action
> IWL_MIMO2_SWITCH_MIMO3_ABC
)
1773 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1774 if (update_search_tbl_counter
)
1775 search_tbl
->action
= tbl
->action
;
1782 * Try to switch to new modulation mode from MIMO3
1784 static int rs_move_mimo3_to_other(struct iwl_priv
*priv
,
1785 struct iwl_lq_sta
*lq_sta
,
1786 struct ieee80211_conf
*conf
,
1787 struct ieee80211_sta
*sta
, int index
)
1789 s8 is_green
= lq_sta
->is_green
;
1790 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1791 struct iwl_scale_tbl_info
*search_tbl
=
1792 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1793 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1794 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1795 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1796 u8 start_action
= tbl
->action
;
1797 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1798 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1800 u8 update_search_tbl_counter
= 0;
1803 lq_sta
->action_counter
++;
1804 switch (tbl
->action
) {
1805 case IWL_MIMO3_SWITCH_ANTENNA1
:
1806 case IWL_MIMO3_SWITCH_ANTENNA2
:
1807 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 toggle Antennas\n");
1809 if (tx_chains_num
<= 3)
1812 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1815 memcpy(search_tbl
, tbl
, sz
);
1816 if (rs_toggle_antenna(valid_tx_ant
,
1817 &search_tbl
->current_rate
, search_tbl
))
1820 case IWL_MIMO3_SWITCH_SISO_A
:
1821 case IWL_MIMO3_SWITCH_SISO_B
:
1822 case IWL_MIMO3_SWITCH_SISO_C
:
1823 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 switch to SISO\n");
1825 /* Set up new search table for SISO */
1826 memcpy(search_tbl
, tbl
, sz
);
1828 if (tbl
->action
== IWL_MIMO3_SWITCH_SISO_A
)
1829 search_tbl
->ant_type
= ANT_A
;
1830 else if (tbl
->action
== IWL_MIMO3_SWITCH_SISO_B
)
1831 search_tbl
->ant_type
= ANT_B
;
1833 search_tbl
->ant_type
= ANT_C
;
1835 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1838 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1845 case IWL_MIMO3_SWITCH_MIMO2_AB
:
1846 case IWL_MIMO3_SWITCH_MIMO2_AC
:
1847 case IWL_MIMO3_SWITCH_MIMO2_BC
:
1848 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 switch to MIMO2\n");
1850 memcpy(search_tbl
, tbl
, sz
);
1851 search_tbl
->is_SGI
= 0;
1852 if (tbl
->action
== IWL_MIMO3_SWITCH_MIMO2_AB
)
1853 search_tbl
->ant_type
= ANT_AB
;
1854 else if (tbl
->action
== IWL_MIMO3_SWITCH_MIMO2_AC
)
1855 search_tbl
->ant_type
= ANT_AC
;
1857 search_tbl
->ant_type
= ANT_BC
;
1859 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1862 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1869 case IWL_MIMO3_SWITCH_GI
:
1871 !(priv
->current_ht_config
.sgf
&
1875 !(priv
->current_ht_config
.sgf
&
1879 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 toggle SGI/NGI\n");
1881 /* Set up new search table for MIMO */
1882 memcpy(search_tbl
, tbl
, sz
);
1883 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1884 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1886 * If active table already uses the fastest possible
1887 * modulation (dual stream with short guard interval),
1888 * and it's working well, there's no need to look
1889 * for a better type of modulation!
1892 s32 tpt
= lq_sta
->last_tpt
/ 100;
1893 if (tpt
>= search_tbl
->expected_tpt
[index
])
1896 search_tbl
->current_rate
=
1897 rate_n_flags_from_tbl(priv
, search_tbl
,
1899 update_search_tbl_counter
= 1;
1903 if (tbl
->action
> IWL_MIMO3_SWITCH_GI
)
1904 tbl
->action
= IWL_MIMO3_SWITCH_ANTENNA1
;
1906 if (tbl
->action
== start_action
)
1909 search_tbl
->lq_type
= LQ_NONE
;
1912 lq_sta
->search_better_tbl
= 1;
1914 if (tbl
->action
> IWL_MIMO3_SWITCH_GI
)
1915 tbl
->action
= IWL_MIMO3_SWITCH_ANTENNA1
;
1916 if (update_search_tbl_counter
)
1917 search_tbl
->action
= tbl
->action
;
1924 * Check whether we should continue using same modulation mode, or
1925 * begin search for a new mode, based on:
1926 * 1) # tx successes or failures while using this mode
1927 * 2) # times calling this function
1928 * 3) elapsed time in this mode (not used, for now)
1930 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
)
1932 struct iwl_scale_tbl_info
*tbl
;
1935 int flush_interval_passed
= 0;
1936 struct iwl_priv
*priv
;
1939 active_tbl
= lq_sta
->active_tbl
;
1941 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1943 /* If we've been disallowing search, see if we should now allow it */
1944 if (lq_sta
->stay_in_tbl
) {
1946 /* Elapsed time using current modulation mode */
1947 if (lq_sta
->flush_timer
)
1948 flush_interval_passed
=
1950 (unsigned long)(lq_sta
->flush_timer
+
1951 IWL_RATE_SCALE_FLUSH_INTVL
));
1954 * Check if we should allow search for new modulation mode.
1955 * If many frames have failed or succeeded, or we've used
1956 * this same modulation for a long time, allow search, and
1957 * reset history stats that keep track of whether we should
1958 * allow a new search. Also (below) reset all bitmaps and
1959 * stats in active history.
1961 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1962 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1963 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1964 && (flush_interval_passed
))) {
1965 IWL_DEBUG_RATE(priv
, "LQ: stay is expired %d %d %d\n:",
1966 lq_sta
->total_failed
,
1967 lq_sta
->total_success
,
1968 flush_interval_passed
);
1970 /* Allow search for new mode */
1971 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1972 lq_sta
->total_failed
= 0;
1973 lq_sta
->total_success
= 0;
1974 lq_sta
->flush_timer
= 0;
1977 * Else if we've used this modulation mode enough repetitions
1978 * (regardless of elapsed time or success/failure), reset
1979 * history bitmaps and rate-specific stats for all rates in
1983 lq_sta
->table_count
++;
1984 if (lq_sta
->table_count
>=
1985 lq_sta
->table_count_limit
) {
1986 lq_sta
->table_count
= 0;
1988 IWL_DEBUG_RATE(priv
, "LQ: stay in table clear win\n");
1989 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1990 rs_rate_scale_clear_window(
1995 /* If transitioning to allow "search", reset all history
1996 * bitmaps and stats in active table (this will become the new
1997 * "search" table). */
1998 if (!lq_sta
->stay_in_tbl
) {
1999 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2000 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2006 * Do rate scaling and search for new modulation mode.
2008 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
2009 struct sk_buff
*skb
,
2010 struct ieee80211_sta
*sta
,
2011 struct iwl_lq_sta
*lq_sta
)
2013 struct ieee80211_hw
*hw
= priv
->hw
;
2014 struct ieee80211_conf
*conf
= &hw
->conf
;
2015 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2016 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2017 int low
= IWL_RATE_INVALID
;
2018 int high
= IWL_RATE_INVALID
;
2021 struct iwl_rate_scale_data
*window
= NULL
;
2022 int current_tpt
= IWL_INVALID_VALUE
;
2023 int low_tpt
= IWL_INVALID_VALUE
;
2024 int high_tpt
= IWL_INVALID_VALUE
;
2026 s8 scale_action
= 0;
2029 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
2030 u16 rate_scale_index_msk
= 0;
2037 u8 tid
= MAX_TID_COUNT
;
2038 struct iwl_tid_data
*tid_data
;
2040 IWL_DEBUG_RATE(priv
, "rate scale calculate new rate for skb\n");
2042 /* Send management frames and NO_ACK data using lowest rate. */
2043 /* TODO: this could probably be improved.. */
2044 if (!ieee80211_is_data(hdr
->frame_control
) ||
2045 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
2048 if (!sta
|| !lq_sta
)
2051 lq_sta
->supp_rates
= sta
->supp_rates
[lq_sta
->band
];
2053 tid
= rs_tl_add_packet(lq_sta
, hdr
);
2056 * Select rate-scale / modulation-mode table to work with in
2057 * the rest of this function: "search" if searching for better
2058 * modulation mode, or "active" if doing rate scaling within a mode.
2060 if (!lq_sta
->search_better_tbl
)
2061 active_tbl
= lq_sta
->active_tbl
;
2063 active_tbl
= 1 - lq_sta
->active_tbl
;
2065 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2066 if (is_legacy(tbl
->lq_type
))
2067 lq_sta
->is_green
= 0;
2069 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2070 is_green
= lq_sta
->is_green
;
2072 /* current tx rate */
2073 index
= lq_sta
->last_txrate_idx
;
2075 IWL_DEBUG_RATE(priv
, "Rate scale index %d for type %d\n", index
,
2078 /* rates available for this association, and for modulation mode */
2079 rate_mask
= rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
);
2081 IWL_DEBUG_RATE(priv
, "mask 0x%04X \n", rate_mask
);
2083 /* mask with station rate restriction */
2084 if (is_legacy(tbl
->lq_type
)) {
2085 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2086 /* supp_rates has no CCK bits in A mode */
2087 rate_scale_index_msk
= (u16
) (rate_mask
&
2088 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
2090 rate_scale_index_msk
= (u16
) (rate_mask
&
2091 lq_sta
->supp_rates
);
2094 rate_scale_index_msk
= rate_mask
;
2096 if (!rate_scale_index_msk
)
2097 rate_scale_index_msk
= rate_mask
;
2099 if (!((1 << index
) & rate_scale_index_msk
)) {
2100 IWL_ERR(priv
, "Current Rate is not valid\n");
2104 /* Get expected throughput table and history window for current rate */
2105 if (!tbl
->expected_tpt
) {
2106 IWL_ERR(priv
, "tbl->expected_tpt is NULL\n");
2110 /* force user max rate if set by user */
2111 if ((lq_sta
->max_rate_idx
!= -1) &&
2112 (lq_sta
->max_rate_idx
< index
)) {
2113 index
= lq_sta
->max_rate_idx
;
2115 window
= &(tbl
->win
[index
]);
2119 window
= &(tbl
->win
[index
]);
2122 * If there is not enough history to calculate actual average
2123 * throughput, keep analyzing results of more tx frames, without
2124 * changing rate or mode (bypass most of the rest of this function).
2125 * Set up new rate table in uCode only if old rate is not supported
2126 * in current association (use new rate found above).
2128 fail_count
= window
->counter
- window
->success_counter
;
2129 if ((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
2130 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
)) {
2131 IWL_DEBUG_RATE(priv
, "LQ: still below TH. succ=%d total=%d "
2133 window
->success_counter
, window
->counter
, index
);
2135 /* Can't calculate this yet; not enough history */
2136 window
->average_tpt
= IWL_INVALID_VALUE
;
2138 /* Should we stay with this modulation mode,
2139 * or search for a new one? */
2140 rs_stay_in_table(lq_sta
);
2145 /* Else we have enough samples; calculate estimate of
2146 * actual average throughput */
2148 BUG_ON(window
->average_tpt
!= ((window
->success_ratio
*
2149 tbl
->expected_tpt
[index
] + 64) / 128));
2151 /* If we are searching for better modulation mode, check success. */
2152 if (lq_sta
->search_better_tbl
) {
2154 /* If good success, continue using the "search" mode;
2155 * no need to send new link quality command, since we're
2156 * continuing to use the setup that we've been trying. */
2157 if (window
->average_tpt
> lq_sta
->last_tpt
) {
2159 IWL_DEBUG_RATE(priv
, "LQ: SWITCHING TO NEW TABLE "
2160 "suc=%d cur-tpt=%d old-tpt=%d\n",
2161 window
->success_ratio
,
2162 window
->average_tpt
,
2165 if (!is_legacy(tbl
->lq_type
))
2166 lq_sta
->enable_counter
= 1;
2168 /* Swap tables; "search" becomes "active" */
2169 lq_sta
->active_tbl
= active_tbl
;
2170 current_tpt
= window
->average_tpt
;
2172 /* Else poor success; go back to mode in "active" table */
2175 IWL_DEBUG_RATE(priv
, "LQ: GOING BACK TO THE OLD TABLE "
2176 "suc=%d cur-tpt=%d old-tpt=%d\n",
2177 window
->success_ratio
,
2178 window
->average_tpt
,
2181 /* Nullify "search" table */
2182 tbl
->lq_type
= LQ_NONE
;
2184 /* Revert to "active" table */
2185 active_tbl
= lq_sta
->active_tbl
;
2186 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2188 /* Revert to "active" rate and throughput info */
2189 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
2190 current_tpt
= lq_sta
->last_tpt
;
2192 /* Need to set up a new rate table in uCode */
2196 /* Either way, we've made a decision; modulation mode
2197 * search is done, allow rate adjustment next time. */
2198 lq_sta
->search_better_tbl
= 0;
2199 done_search
= 1; /* Don't switch modes below! */
2203 /* (Else) not in search of better modulation mode, try for better
2204 * starting rate, while staying in this mode. */
2205 high_low
= rs_get_adjacent_rate(priv
, index
, rate_scale_index_msk
,
2207 low
= high_low
& 0xff;
2208 high
= (high_low
>> 8) & 0xff;
2210 /* If user set max rate, dont allow higher than user constrain */
2211 if ((lq_sta
->max_rate_idx
!= -1) &&
2212 (lq_sta
->max_rate_idx
< high
))
2213 high
= IWL_RATE_INVALID
;
2215 sr
= window
->success_ratio
;
2217 /* Collect measured throughputs for current and adjacent rates */
2218 current_tpt
= window
->average_tpt
;
2219 if (low
!= IWL_RATE_INVALID
)
2220 low_tpt
= tbl
->win
[low
].average_tpt
;
2221 if (high
!= IWL_RATE_INVALID
)
2222 high_tpt
= tbl
->win
[high
].average_tpt
;
2226 /* Too many failures, decrease rate */
2227 if ((sr
<= IWL_RATE_DECREASE_TH
) || (current_tpt
== 0)) {
2228 IWL_DEBUG_RATE(priv
, "decrease rate because of low success_ratio\n");
2231 /* No throughput measured yet for adjacent rates; try increase. */
2232 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
2233 (high_tpt
== IWL_INVALID_VALUE
)) {
2235 if (high
!= IWL_RATE_INVALID
&& sr
>= IWL_RATE_INCREASE_TH
)
2237 else if (low
!= IWL_RATE_INVALID
)
2241 /* Both adjacent throughputs are measured, but neither one has better
2242 * throughput; we're using the best rate, don't change it! */
2243 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
2244 (high_tpt
!= IWL_INVALID_VALUE
) &&
2245 (low_tpt
< current_tpt
) &&
2246 (high_tpt
< current_tpt
))
2249 /* At least one adjacent rate's throughput is measured,
2250 * and may have better performance. */
2252 /* Higher adjacent rate's throughput is measured */
2253 if (high_tpt
!= IWL_INVALID_VALUE
) {
2254 /* Higher rate has better throughput */
2255 if (high_tpt
> current_tpt
&&
2256 sr
>= IWL_RATE_INCREASE_TH
) {
2262 /* Lower adjacent rate's throughput is measured */
2263 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
2264 /* Lower rate has better throughput */
2265 if (low_tpt
> current_tpt
) {
2266 IWL_DEBUG_RATE(priv
,
2267 "decrease rate because of low tpt\n");
2269 } else if (sr
>= IWL_RATE_INCREASE_TH
) {
2275 /* Sanity check; asked for decrease, but success rate or throughput
2276 * has been good at old rate. Don't change it. */
2277 if ((scale_action
== -1) && (low
!= IWL_RATE_INVALID
) &&
2278 ((sr
> IWL_RATE_HIGH_TH
) ||
2279 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
2282 switch (scale_action
) {
2284 /* Decrease starting rate, update uCode's rate table */
2285 if (low
!= IWL_RATE_INVALID
) {
2292 /* Increase starting rate, update uCode's rate table */
2293 if (high
!= IWL_RATE_INVALID
) {
2305 IWL_DEBUG_RATE(priv
, "choose rate scale index %d action %d low %d "
2306 "high %d type %d\n",
2307 index
, scale_action
, low
, high
, tbl
->lq_type
);
2310 /* Replace uCode's rate table for the destination station. */
2312 rate
= rate_n_flags_from_tbl(priv
, tbl
, index
, is_green
);
2313 rs_fill_link_cmd(priv
, lq_sta
, rate
);
2314 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2317 /* Should we stay with this modulation mode, or search for a new one? */
2318 rs_stay_in_table(lq_sta
);
2321 * Search for new modulation mode if we're:
2322 * 1) Not changing rates right now
2323 * 2) Not just finishing up a search
2324 * 3) Allowing a new search
2326 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
&& window
->counter
) {
2327 /* Save current throughput to compare with "search" throughput*/
2328 lq_sta
->last_tpt
= current_tpt
;
2330 /* Select a new "search" modulation mode to try.
2331 * If one is found, set up the new "search" table. */
2332 if (is_legacy(tbl
->lq_type
))
2333 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
2334 else if (is_siso(tbl
->lq_type
))
2335 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
2336 else if (is_mimo2(tbl
->lq_type
))
2337 rs_move_mimo2_to_other(priv
, lq_sta
, conf
, sta
, index
);
2339 rs_move_mimo3_to_other(priv
, lq_sta
, conf
, sta
, index
);
2341 /* If new "search" mode was selected, set up in uCode table */
2342 if (lq_sta
->search_better_tbl
) {
2343 /* Access the "search" table, clear its history. */
2344 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2345 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2346 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2348 /* Use new "search" start rate */
2349 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
2351 IWL_DEBUG_RATE(priv
, "Switch current mcs: %X index: %d\n",
2352 tbl
->current_rate
, index
);
2353 rs_fill_link_cmd(priv
, lq_sta
, tbl
->current_rate
);
2354 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2359 if (done_search
&& !lq_sta
->stay_in_tbl
) {
2360 /* If the "active" (non-search) mode was legacy,
2361 * and we've tried switching antennas,
2362 * but we haven't been able to try HT modes (not available),
2363 * stay with best antenna legacy modulation for a while
2364 * before next round of mode comparisons. */
2365 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2366 if (is_legacy(tbl1
->lq_type
) && !conf_is_ht(conf
) &&
2367 lq_sta
->action_counter
> tbl1
->max_search
) {
2368 IWL_DEBUG_RATE(priv
, "LQ: STAY in legacy table\n");
2369 rs_set_stay_in_table(priv
, 1, lq_sta
);
2372 /* If we're in an HT mode, and all 3 mode switch actions
2373 * have been tried and compared, stay in this best modulation
2374 * mode for a while before next round of mode comparisons. */
2375 if (lq_sta
->enable_counter
&&
2376 (lq_sta
->action_counter
>= tbl1
->max_search
)) {
2377 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2378 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2379 (tid
!= MAX_TID_COUNT
)) {
2381 &priv
->stations
[lq_sta
->lq
.sta_id
].tid
[tid
];
2382 if (tid_data
->agg
.state
== IWL_AGG_OFF
) {
2383 IWL_DEBUG_RATE(priv
,
2384 "try to aggregate tid %d\n",
2386 rs_tl_turn_on_agg(priv
, tid
,
2390 rs_set_stay_in_table(priv
, 0, lq_sta
);
2395 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, index
, is_green
);
2397 lq_sta
->last_txrate_idx
= i
;
2403 static void rs_initialize_lq(struct iwl_priv
*priv
,
2404 struct ieee80211_conf
*conf
,
2405 struct ieee80211_sta
*sta
,
2406 struct iwl_lq_sta
*lq_sta
)
2408 struct iwl_scale_tbl_info
*tbl
;
2412 u8 use_green
= rs_use_green(priv
, conf
);
2416 if (!sta
|| !lq_sta
)
2419 i
= lq_sta
->last_txrate_idx
;
2421 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2422 (priv
->iw_mode
== NL80211_IFTYPE_ADHOC
))
2425 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2427 if (!lq_sta
->search_better_tbl
)
2428 active_tbl
= lq_sta
->active_tbl
;
2430 active_tbl
= 1 - lq_sta
->active_tbl
;
2432 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2434 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2437 rate
= iwl_rates
[i
].plcp
;
2438 tbl
->ant_type
= first_antenna(valid_tx_ant
);
2439 rate
|= tbl
->ant_type
<< RATE_MCS_ANT_POS
;
2441 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2442 rate
|= RATE_MCS_CCK_MSK
;
2444 rs_get_tbl_info_from_mcs(rate
, priv
->band
, tbl
, &rate_idx
);
2445 if (!rs_is_valid_ant(valid_tx_ant
, tbl
->ant_type
))
2446 rs_toggle_antenna(valid_tx_ant
, &rate
, tbl
);
2448 rate
= rate_n_flags_from_tbl(priv
, tbl
, rate_idx
, use_green
);
2449 tbl
->current_rate
= rate
;
2450 rs_set_expected_tpt_table(lq_sta
, tbl
);
2451 rs_fill_link_cmd(NULL
, lq_sta
, rate
);
2452 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2457 static void rs_get_rate(void *priv_r
, struct ieee80211_sta
*sta
, void *priv_sta
,
2458 struct ieee80211_tx_rate_control
*txrc
)
2461 struct sk_buff
*skb
= txrc
->skb
;
2462 struct ieee80211_supported_band
*sband
= txrc
->sband
;
2463 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2464 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2465 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2466 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2467 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2471 IWL_DEBUG_RATE_LIMIT(priv
, "rate scale calculate new rate for skb\n");
2473 /* Get max rate if user set max rate */
2475 lq_sta
->max_rate_idx
= txrc
->max_rate_idx
;
2476 if ((sband
->band
== IEEE80211_BAND_5GHZ
) &&
2477 (lq_sta
->max_rate_idx
!= -1))
2478 lq_sta
->max_rate_idx
+= IWL_FIRST_OFDM_RATE
;
2479 if ((lq_sta
->max_rate_idx
< 0) ||
2480 (lq_sta
->max_rate_idx
>= IWL_RATE_COUNT
))
2481 lq_sta
->max_rate_idx
= -1;
2485 mask_bit
= sta
->supp_rates
[sband
->band
];
2487 /* Send management frames and NO_ACK data using lowest rate. */
2488 if (!ieee80211_is_data(hdr
->frame_control
) ||
2489 info
->flags
& IEEE80211_TX_CTL_NO_ACK
|| !sta
|| !lq_sta
) {
2491 info
->control
.rates
[0].idx
=
2492 rate_lowest_index(sband
, NULL
);
2494 info
->control
.rates
[0].idx
=
2495 rate_lowest_index(sband
, sta
);
2496 if (info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
2497 info
->control
.rates
[0].count
= 1;
2501 rate_idx
= lq_sta
->last_txrate_idx
;
2503 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
2504 !lq_sta
->ibss_sta_added
) {
2505 u8 sta_id
= iwl_find_station(priv
, hdr
->addr1
);
2507 if (sta_id
== IWL_INVALID_STATION
) {
2508 IWL_DEBUG_RATE(priv
, "LQ: ADD station %pM\n",
2510 sta_id
= iwl_add_station(priv
, hdr
->addr1
,
2511 false, CMD_ASYNC
, NULL
);
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 (lq_sta
->last_rate_n_flags
& RATE_MCS_HT_MSK
) {
2522 rate_idx
-= IWL_FIRST_OFDM_RATE
;
2523 /* 6M and 9M shared same MCS index */
2524 rate_idx
= (rate_idx
> 0) ? (rate_idx
- 1) : 0;
2525 if (rs_extract_rate(lq_sta
->last_rate_n_flags
) >=
2526 IWL_RATE_MIMO3_6M_PLCP
)
2527 rate_idx
= rate_idx
+ (2 * MCS_INDEX_PER_STREAM
);
2528 else if (rs_extract_rate(lq_sta
->last_rate_n_flags
) >=
2529 IWL_RATE_MIMO2_6M_PLCP
)
2530 rate_idx
= rate_idx
+ MCS_INDEX_PER_STREAM
;
2531 info
->control
.rates
[0].flags
= IEEE80211_TX_RC_MCS
;
2532 if (lq_sta
->last_rate_n_flags
& RATE_MCS_SGI_MSK
)
2533 info
->control
.rates
[0].flags
|= IEEE80211_TX_RC_SHORT_GI
;
2534 if (lq_sta
->last_rate_n_flags
& RATE_MCS_DUP_MSK
)
2535 info
->control
.rates
[0].flags
|= IEEE80211_TX_RC_DUP_DATA
;
2536 if (lq_sta
->last_rate_n_flags
& RATE_MCS_FAT_MSK
)
2537 info
->control
.rates
[0].flags
|= IEEE80211_TX_RC_40_MHZ_WIDTH
;
2538 if (lq_sta
->last_rate_n_flags
& RATE_MCS_GF_MSK
)
2539 info
->control
.rates
[0].flags
|= IEEE80211_TX_RC_GREEN_FIELD
;
2541 if (rate_idx
< 0 || rate_idx
> IWL_RATE_COUNT
)
2542 rate_idx
= rate_lowest_index(sband
, sta
);
2543 else if (sband
->band
== IEEE80211_BAND_5GHZ
)
2544 rate_idx
-= IWL_FIRST_OFDM_RATE
;
2546 info
->control
.rates
[0].idx
= rate_idx
;
2550 static void *rs_alloc_sta(void *priv_rate
, struct ieee80211_sta
*sta
,
2553 struct iwl_lq_sta
*lq_sta
;
2554 struct iwl_priv
*priv
;
2557 priv
= (struct iwl_priv
*)priv_rate
;
2558 IWL_DEBUG_RATE(priv
, "create station rate scale window\n");
2560 lq_sta
= kzalloc(sizeof(struct iwl_lq_sta
), gfp
);
2564 lq_sta
->lq
.sta_id
= 0xff;
2567 for (j
= 0; j
< LQ_SIZE
; j
++)
2568 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2569 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2574 static void rs_rate_init(void *priv_r
, struct ieee80211_supported_band
*sband
,
2575 struct ieee80211_sta
*sta
, void *priv_sta
)
2578 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2579 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2580 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2585 lq_sta
->flush_timer
= 0;
2586 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2587 for (j
= 0; j
< LQ_SIZE
; j
++)
2588 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2589 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2591 IWL_DEBUG_RATE(priv
, "LQ: *** rate scale station global init ***\n");
2592 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2593 * the lowest or the highest rate.. Could consider using RSSI from
2594 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2597 lq_sta
->ibss_sta_added
= 0;
2598 if (priv
->iw_mode
== NL80211_IFTYPE_AP
) {
2599 u8 sta_id
= iwl_find_station(priv
,
2602 /* for IBSS the call are from tasklet */
2603 IWL_DEBUG_RATE(priv
, "LQ: ADD station %pM\n", sta
->addr
);
2605 if (sta_id
== IWL_INVALID_STATION
) {
2606 IWL_DEBUG_RATE(priv
, "LQ: ADD station %pM\n", sta
->addr
);
2607 sta_id
= iwl_add_station(priv
, sta
->addr
, false,
2610 if ((sta_id
!= IWL_INVALID_STATION
)) {
2611 lq_sta
->lq
.sta_id
= sta_id
;
2612 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2614 /* FIXME: this is w/a remove it later */
2615 priv
->assoc_station_added
= 1;
2619 lq_sta
->max_rate_idx
= -1;
2620 lq_sta
->missed_rate_counter
= IWL_MISSED_RATE_MAX
;
2621 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2622 lq_sta
->active_legacy_rate
= priv
->active_rate
& ~(0x1000);
2623 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2624 lq_sta
->band
= priv
->band
;
2626 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2627 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2629 lq_sta
->active_siso_rate
= sta
->ht_cap
.mcs
.rx_mask
[0] << 1;
2630 lq_sta
->active_siso_rate
|= sta
->ht_cap
.mcs
.rx_mask
[0] & 0x1;
2631 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2632 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2635 lq_sta
->active_mimo2_rate
= sta
->ht_cap
.mcs
.rx_mask
[1] << 1;
2636 lq_sta
->active_mimo2_rate
|= sta
->ht_cap
.mcs
.rx_mask
[1] & 0x1;
2637 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2638 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2640 lq_sta
->active_mimo3_rate
= sta
->ht_cap
.mcs
.rx_mask
[2] << 1;
2641 lq_sta
->active_mimo3_rate
|= sta
->ht_cap
.mcs
.rx_mask
[2] & 0x1;
2642 lq_sta
->active_mimo3_rate
&= ~((u16
)0x2);
2643 lq_sta
->active_mimo3_rate
<<= IWL_FIRST_OFDM_RATE
;
2645 IWL_DEBUG_RATE(priv
, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2646 lq_sta
->active_siso_rate
,
2647 lq_sta
->active_mimo2_rate
,
2648 lq_sta
->active_mimo3_rate
);
2650 /* These values will be overridden later */
2651 lq_sta
->lq
.general_params
.single_stream_ant_msk
= ANT_A
;
2652 lq_sta
->lq
.general_params
.dual_stream_ant_msk
= ANT_AB
;
2654 /* as default allow aggregation for all tids */
2655 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2658 /* Find highest tx rate supported by hardware and destination station */
2659 mask_bit
= sta
->supp_rates
[sband
->band
];
2660 count
= sband
->n_bitrates
;
2661 if (sband
->band
== IEEE80211_BAND_5GHZ
) {
2662 count
+= IWL_FIRST_OFDM_RATE
;
2663 start_rate
= IWL_FIRST_OFDM_RATE
;
2664 mask_bit
<<= IWL_FIRST_OFDM_RATE
;
2667 mask_bit
= mask_bit
& lq_sta
->active_legacy_rate
;
2668 lq_sta
->last_txrate_idx
= 4;
2669 for (i
= start_rate
; i
< count
; i
++)
2670 if (mask_bit
& BIT(i
))
2671 lq_sta
->last_txrate_idx
= i
;
2673 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2676 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
2677 struct iwl_lq_sta
*lq_sta
, u32 new_rate
)
2679 struct iwl_scale_tbl_info tbl_type
;
2682 int repeat_rate
= 0;
2683 u8 ant_toggle_cnt
= 0;
2684 u8 use_ht_possible
= 1;
2685 u8 valid_tx_ant
= 0;
2686 struct iwl_link_quality_cmd
*lq_cmd
= &lq_sta
->lq
;
2688 /* Override starting rate (index 0) if needed for debug purposes */
2689 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2691 /* Interpret new_rate (rate_n_flags) */
2692 memset(&tbl_type
, 0, sizeof(tbl_type
));
2693 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
,
2694 &tbl_type
, &rate_idx
);
2696 /* How many times should we repeat the initial rate? */
2697 if (is_legacy(tbl_type
.lq_type
)) {
2699 repeat_rate
= IWL_NUMBER_TRY
;
2701 repeat_rate
= IWL_HT_NUMBER_TRY
;
2704 lq_cmd
->general_params
.mimo_delimiter
=
2705 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2707 /* Fill 1st table entry (index 0) */
2708 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2710 if (num_of_ant(tbl_type
.ant_type
) == 1) {
2711 lq_cmd
->general_params
.single_stream_ant_msk
=
2713 } else if (num_of_ant(tbl_type
.ant_type
) == 2) {
2714 lq_cmd
->general_params
.dual_stream_ant_msk
=
2716 } /* otherwise we don't modify the existing value */
2722 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2724 /* Fill rest of rate table */
2725 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2726 /* Repeat initial/next rate.
2727 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2728 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2729 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2730 if (is_legacy(tbl_type
.lq_type
)) {
2731 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2734 rs_toggle_antenna(valid_tx_ant
,
2735 &new_rate
, &tbl_type
))
2739 /* Override next rate if needed for debug purposes */
2740 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2742 /* Fill next table entry */
2743 lq_cmd
->rs_table
[index
].rate_n_flags
=
2744 cpu_to_le32(new_rate
);
2749 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
, &tbl_type
,
2752 /* Indicate to uCode which entries might be MIMO.
2753 * If initial rate was MIMO, this will finally end up
2754 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2755 if (is_mimo(tbl_type
.lq_type
))
2756 lq_cmd
->general_params
.mimo_delimiter
= index
;
2759 new_rate
= rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2762 /* How many times should we repeat the next rate? */
2763 if (is_legacy(tbl_type
.lq_type
)) {
2764 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2767 rs_toggle_antenna(valid_tx_ant
,
2768 &new_rate
, &tbl_type
))
2771 repeat_rate
= IWL_NUMBER_TRY
;
2773 repeat_rate
= IWL_HT_NUMBER_TRY
;
2776 /* Don't allow HT rates after next pass.
2777 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2778 use_ht_possible
= 0;
2780 /* Override next rate if needed for debug purposes */
2781 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2783 /* Fill next table entry */
2784 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2790 lq_cmd
->agg_params
.agg_frame_cnt_limit
= LINK_QUAL_AGG_FRAME_LIMIT_MAX
;
2791 lq_cmd
->agg_params
.agg_dis_start_th
= LINK_QUAL_AGG_DISABLE_START_DEF
;
2792 lq_cmd
->agg_params
.agg_time_limit
=
2793 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF
);
2796 static void *rs_alloc(struct ieee80211_hw
*hw
, struct dentry
*debugfsdir
)
2800 /* rate scale requires free function to be implemented */
2801 static void rs_free(void *priv_rate
)
2806 static void rs_free_sta(void *priv_r
, struct ieee80211_sta
*sta
,
2809 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2810 struct iwl_priv
*priv __maybe_unused
= priv_r
;
2812 IWL_DEBUG_RATE(priv
, "enter\n");
2814 IWL_DEBUG_RATE(priv
, "leave\n");
2818 #ifdef CONFIG_MAC80211_DEBUGFS
2819 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2821 file
->private_data
= inode
->i_private
;
2824 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
2825 u32
*rate_n_flags
, int index
)
2827 struct iwl_priv
*priv
;
2832 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2833 if (lq_sta
->dbg_fixed_rate
) {
2835 ((lq_sta
->dbg_fixed_rate
& RATE_MCS_ANT_ABC_MSK
)
2836 >> RATE_MCS_ANT_POS
);
2837 if ((valid_tx_ant
& ant_sel_tx
) == ant_sel_tx
) {
2838 *rate_n_flags
= lq_sta
->dbg_fixed_rate
;
2839 IWL_DEBUG_RATE(priv
, "Fixed rate ON\n");
2841 lq_sta
->dbg_fixed_rate
= 0;
2843 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2844 ant_sel_tx
, valid_tx_ant
);
2845 IWL_DEBUG_RATE(priv
, "Fixed rate OFF\n");
2848 IWL_DEBUG_RATE(priv
, "Fixed rate OFF\n");
2852 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2853 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2855 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2856 struct iwl_priv
*priv
;
2862 memset(buf
, 0, sizeof(buf
));
2863 buf_size
= min(count
, sizeof(buf
) - 1);
2864 if (copy_from_user(buf
, user_buf
, buf_size
))
2867 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2868 lq_sta
->dbg_fixed_rate
= parsed_rate
;
2870 lq_sta
->dbg_fixed_rate
= 0;
2872 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2873 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2874 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2875 lq_sta
->active_mimo3_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2877 IWL_DEBUG_RATE(priv
, "sta_id %d rate 0x%X\n",
2878 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed_rate
);
2880 if (lq_sta
->dbg_fixed_rate
) {
2881 rs_fill_link_cmd(NULL
, lq_sta
, lq_sta
->dbg_fixed_rate
);
2882 iwl_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2888 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2889 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2897 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2898 struct iwl_priv
*priv
;
2899 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2902 buff
= kmalloc(1024, GFP_KERNEL
);
2906 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2907 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2908 lq_sta
->total_failed
, lq_sta
->total_success
,
2909 lq_sta
->active_legacy_rate
);
2910 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2911 lq_sta
->dbg_fixed_rate
);
2912 desc
+= sprintf(buff
+desc
, "valid_tx_ant %s%s%s\n",
2913 (priv
->hw_params
.valid_tx_ant
& ANT_A
) ? "ANT_A," : "",
2914 (priv
->hw_params
.valid_tx_ant
& ANT_B
) ? "ANT_B," : "",
2915 (priv
->hw_params
.valid_tx_ant
& ANT_C
) ? "ANT_C" : "");
2916 desc
+= sprintf(buff
+desc
, "lq type %s\n",
2917 (is_legacy(tbl
->lq_type
)) ? "legacy" : "HT");
2918 if (is_Ht(tbl
->lq_type
)) {
2919 desc
+= sprintf(buff
+desc
, " %s",
2920 (is_siso(tbl
->lq_type
)) ? "SISO" :
2921 ((is_mimo2(tbl
->lq_type
)) ? "MIMO2" : "MIMO3"));
2922 desc
+= sprintf(buff
+desc
, " %s",
2923 (tbl
->is_fat
) ? "40MHz" : "20MHz");
2924 desc
+= sprintf(buff
+desc
, " %s %s\n", (tbl
->is_SGI
) ? "SGI" : "",
2925 (lq_sta
->is_green
) ? "GF enabled" : "");
2927 desc
+= sprintf(buff
+desc
, "last tx rate=0x%X\n",
2928 lq_sta
->last_rate_n_flags
);
2929 desc
+= sprintf(buff
+desc
, "general:"
2930 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2931 lq_sta
->lq
.general_params
.flags
,
2932 lq_sta
->lq
.general_params
.mimo_delimiter
,
2933 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2934 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2936 desc
+= sprintf(buff
+desc
, "agg:"
2937 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2938 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2939 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2940 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2942 desc
+= sprintf(buff
+desc
,
2943 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2944 lq_sta
->lq
.general_params
.start_rate_index
[0],
2945 lq_sta
->lq
.general_params
.start_rate_index
[1],
2946 lq_sta
->lq
.general_params
.start_rate_index
[2],
2947 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2949 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++) {
2950 index
= iwl_hwrate_to_plcp_idx(
2951 le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2952 if (is_legacy(tbl
->lq_type
)) {
2953 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X %smbps\n",
2954 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
),
2955 iwl_rate_mcs
[index
].mbps
);
2957 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X %smbps (%s)\n",
2958 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
),
2959 iwl_rate_mcs
[index
].mbps
, iwl_rate_mcs
[index
].mcs
);
2963 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2968 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2969 .write
= rs_sta_dbgfs_scale_table_write
,
2970 .read
= rs_sta_dbgfs_scale_table_read
,
2971 .open
= open_file_generic
,
2973 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2974 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2981 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2983 buff
= kmalloc(1024, GFP_KERNEL
);
2987 for (i
= 0; i
< LQ_SIZE
; i
++) {
2988 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d GF=%d\n"
2990 lq_sta
->active_tbl
== i
? "*" : "x",
2991 lq_sta
->lq_info
[i
].lq_type
,
2992 lq_sta
->lq_info
[i
].is_SGI
,
2993 lq_sta
->lq_info
[i
].is_fat
,
2994 lq_sta
->lq_info
[i
].is_dup
,
2996 lq_sta
->lq_info
[i
].current_rate
);
2997 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2998 desc
+= sprintf(buff
+desc
,
2999 "counter=%d success=%d %%=%d\n",
3000 lq_sta
->lq_info
[i
].win
[j
].counter
,
3001 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
3002 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
3005 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3010 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
3011 .read
= rs_sta_dbgfs_stats_table_read
,
3012 .open
= open_file_generic
,
3015 static ssize_t
rs_sta_dbgfs_rate_scale_data_read(struct file
*file
,
3016 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3022 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3023 struct iwl_priv
*priv
;
3024 struct iwl_scale_tbl_info
*tbl
= &lq_sta
->lq_info
[lq_sta
->active_tbl
];
3028 if (is_Ht(tbl
->lq_type
))
3029 desc
+= sprintf(buff
+desc
,
3030 "Bit Rate= %d Mb/s\n",
3031 tbl
->expected_tpt
[lq_sta
->last_txrate_idx
]);
3033 desc
+= sprintf(buff
+desc
,
3034 "Bit Rate= %d Mb/s\n",
3035 iwl_rates
[lq_sta
->last_txrate_idx
].ieee
>> 1);
3036 desc
+= sprintf(buff
+desc
,
3037 "Signal Level= %d dBm\tNoise Level= %d dBm\n",
3038 priv
->last_rx_rssi
, priv
->last_rx_noise
);
3039 desc
+= sprintf(buff
+desc
,
3040 "Tsf= 0x%llx\tBeacon time= 0x%08X\n",
3041 priv
->last_tsf
, priv
->last_beacon_time
);
3043 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3047 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops
= {
3048 .read
= rs_sta_dbgfs_rate_scale_data_read
,
3049 .open
= open_file_generic
,
3052 static void rs_add_debugfs(void *priv
, void *priv_sta
,
3055 struct iwl_lq_sta
*lq_sta
= priv_sta
;
3056 lq_sta
->rs_sta_dbgfs_scale_table_file
=
3057 debugfs_create_file("rate_scale_table", 0600, dir
,
3058 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
3059 lq_sta
->rs_sta_dbgfs_stats_table_file
=
3060 debugfs_create_file("rate_stats_table", 0600, dir
,
3061 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
3062 lq_sta
->rs_sta_dbgfs_rate_scale_data_file
=
3063 debugfs_create_file("rate_scale_data", 0600, dir
,
3064 lq_sta
, &rs_sta_dbgfs_rate_scale_data_ops
);
3065 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
3066 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
3067 &lq_sta
->tx_agg_tid_en
);
3071 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
3073 struct iwl_lq_sta
*lq_sta
= priv_sta
;
3074 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
3075 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
3076 debugfs_remove(lq_sta
->rs_sta_dbgfs_rate_scale_data_file
);
3077 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
3081 static struct rate_control_ops rs_ops
= {
3084 .tx_status
= rs_tx_status
,
3085 .get_rate
= rs_get_rate
,
3086 .rate_init
= rs_rate_init
,
3089 .alloc_sta
= rs_alloc_sta
,
3090 .free_sta
= rs_free_sta
,
3091 #ifdef CONFIG_MAC80211_DEBUGFS
3092 .add_sta_debugfs
= rs_add_debugfs
,
3093 .remove_sta_debugfs
= rs_remove_debugfs
,
3097 int iwlagn_rate_control_register(void)
3099 return ieee80211_rate_control_register(&rs_ops
);
3102 void iwlagn_rate_control_unregister(void)
3104 ieee80211_rate_control_unregister(&rs_ops
);