1 /******************************************************************************
3 * Copyright(c) 2005 - 2008 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 * James P. Ketrenos <ipw2100-admin@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>
41 #include "iwl-helpers.h"
43 #define RS_NAME "iwl-agn-rs"
45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53 /* max time to accum history 2 seconds */
54 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
56 static u8 rs_ht_to_legacy
[] = {
57 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
58 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
60 IWL_RATE_6M_INDEX
, IWL_RATE_9M_INDEX
,
61 IWL_RATE_12M_INDEX
, IWL_RATE_18M_INDEX
,
62 IWL_RATE_24M_INDEX
, IWL_RATE_36M_INDEX
,
63 IWL_RATE_48M_INDEX
, IWL_RATE_54M_INDEX
66 static const u8 ant_toggle_lookup
[] = {
67 /*ANT_NONE -> */ ANT_NONE
,
70 /*ANT_AB -> */ ANT_BC
,
72 /*ANT_AC -> */ ANT_AB
,
73 /*ANT_BC -> */ ANT_AC
,
74 /*ANT_ABC -> */ ANT_ABC
,
78 * struct iwl_rate_scale_data -- tx success history for one rate
80 struct iwl_rate_scale_data
{
81 u64 data
; /* bitmap of successful frames */
82 s32 success_counter
; /* number of frames successful */
83 s32 success_ratio
; /* per-cent * 128 */
84 s32 counter
; /* number of frames attempted */
85 s32 average_tpt
; /* success ratio * expected throughput */
90 * struct iwl_scale_tbl_info -- tx params and success history for all rates
92 * There are two of these in struct iwl_lq_sta,
93 * one for "active", and one for "search".
95 struct iwl_scale_tbl_info
{
96 enum iwl_table_type lq_type
;
98 u8 is_SGI
; /* 1 = short guard interval */
99 u8 is_fat
; /* 1 = 40 MHz channel width */
100 u8 is_dup
; /* 1 = duplicated data streams */
101 u8 action
; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
102 s32
*expected_tpt
; /* throughput metrics; expected_tpt_G, etc. */
103 u32 current_rate
; /* rate_n_flags, uCode API format */
104 struct iwl_rate_scale_data win
[IWL_RATE_COUNT
]; /* rate histories */
107 struct iwl_traffic_load
{
108 unsigned long time_stamp
; /* age of the oldest statistics */
109 u32 packet_count
[TID_QUEUE_MAX_SIZE
]; /* packet count in this time
111 u32 total
; /* total num of packets during the
112 * last TID_MAX_TIME_DIFF */
113 u8 queue_count
; /* number of queues that has
114 * been used since the last cleanup */
115 u8 head
; /* start of the circular buffer */
119 * struct iwl_lq_sta -- driver's rate scaling private structure
121 * Pointer to this gets passed back and forth between driver and mac80211.
124 u8 active_tbl
; /* index of active table, range 0-1 */
125 u8 enable_counter
; /* indicates HT mode */
126 u8 stay_in_tbl
; /* 1: disallow, 0: allow search for new mode */
127 u8 search_better_tbl
; /* 1: currently trying alternate mode */
130 /* The following determine when to search for a new mode */
131 u32 table_count_limit
;
132 u32 max_failure_limit
; /* # failed frames before new search */
133 u32 max_success_limit
; /* # successful frames before new search */
135 u32 total_failed
; /* total failed frames, any/all rates */
136 u32 total_success
; /* total successful frames, any/all rates */
137 u32 flush_timer
; /* time staying in mode before new search */
139 u8 action_counter
; /* # mode-switch actions tried */
142 enum ieee80211_band band
;
145 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
147 u16 active_legacy_rate
;
148 u16 active_siso_rate
;
149 u16 active_mimo2_rate
;
150 u16 active_mimo3_rate
;
151 u16 active_rate_basic
;
153 struct iwl_link_quality_cmd lq
;
154 struct iwl_scale_tbl_info lq_info
[LQ_SIZE
]; /* "active", "search" */
155 struct iwl_traffic_load load
[TID_MAX_LOAD_COUNT
];
157 #ifdef CONFIG_MAC80211_DEBUGFS
158 struct dentry
*rs_sta_dbgfs_scale_table_file
;
159 struct dentry
*rs_sta_dbgfs_stats_table_file
;
160 struct dentry
*rs_sta_dbgfs_tx_agg_tid_en_file
;
163 struct iwl_priv
*drv
;
165 /* used to be in sta_info */
169 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
170 struct ieee80211_hdr
*hdr
,
171 struct ieee80211_sta
*sta
,
172 struct iwl_lq_sta
*lq_sta
);
173 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
174 struct iwl_lq_sta
*lq_sta
, u32 rate_n_flags
);
177 #ifdef CONFIG_MAC80211_DEBUGFS
178 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
179 u32
*rate_n_flags
, int index
);
181 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
182 u32
*rate_n_flags
, int index
)
187 * Expected throughput metrics for following rates:
188 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
189 * "G" is the only table that supports CCK (the first 4 rates).
191 /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
192 static s32 expected_tpt_A
[IWL_RATE_COUNT
] = {
193 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
196 static s32 expected_tpt_G
[IWL_RATE_COUNT
] = {
197 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
200 static s32 expected_tpt_siso20MHz
[IWL_RATE_COUNT
] = {
201 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
204 static s32 expected_tpt_siso20MHzSGI
[IWL_RATE_COUNT
] = {
205 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
208 static s32 expected_tpt_mimo20MHz
[IWL_RATE_COUNT
] = {
209 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
212 static s32 expected_tpt_mimo20MHzSGI
[IWL_RATE_COUNT
] = {
213 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
216 static s32 expected_tpt_siso40MHz
[IWL_RATE_COUNT
] = {
217 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
220 static s32 expected_tpt_siso40MHzSGI
[IWL_RATE_COUNT
] = {
221 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
224 static s32 expected_tpt_mimo40MHz
[IWL_RATE_COUNT
] = {
225 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
228 static s32 expected_tpt_mimo40MHzSGI
[IWL_RATE_COUNT
] = {
229 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
232 static inline u8
rs_extract_rate(u32 rate_n_flags
)
234 return (u8
)(rate_n_flags
& 0xFF);
237 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data
*window
)
240 window
->success_counter
= 0;
241 window
->success_ratio
= IWL_INVALID_VALUE
;
243 window
->average_tpt
= IWL_INVALID_VALUE
;
247 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
249 return (ant_type
& valid_antenna
) == ant_type
;
253 * removes the old data from the statistics. All data that is older than
254 * TID_MAX_TIME_DIFF, will be deleted.
256 static void rs_tl_rm_old_stats(struct iwl_traffic_load
*tl
, u32 curr_time
)
258 /* The oldest age we want to keep */
259 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
261 while (tl
->queue_count
&&
262 (tl
->time_stamp
< oldest_time
)) {
263 tl
->total
-= tl
->packet_count
[tl
->head
];
264 tl
->packet_count
[tl
->head
] = 0;
265 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
268 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
274 * increment traffic load value for tid and also remove
275 * any old values if passed the certain time period
277 static u8
rs_tl_add_packet(struct iwl_lq_sta
*lq_data
,
278 struct ieee80211_hdr
*hdr
)
280 u32 curr_time
= jiffies_to_msecs(jiffies
);
283 struct iwl_traffic_load
*tl
= NULL
;
284 __le16 fc
= hdr
->frame_control
;
287 if (ieee80211_is_data_qos(fc
)) {
288 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
291 return MAX_TID_COUNT
;
293 tl
= &lq_data
->load
[tid
];
295 curr_time
-= curr_time
% TID_ROUND_VALUE
;
297 /* Happens only for the first packet. Initialize the data */
298 if (!(tl
->queue_count
)) {
300 tl
->time_stamp
= curr_time
;
303 tl
->packet_count
[0] = 1;
304 return MAX_TID_COUNT
;
307 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
308 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
310 /* The history is too long: remove data that is older than */
311 /* TID_MAX_TIME_DIFF */
312 if (index
>= TID_QUEUE_MAX_SIZE
)
313 rs_tl_rm_old_stats(tl
, curr_time
);
315 index
= (tl
->head
+ index
) % TID_QUEUE_MAX_SIZE
;
316 tl
->packet_count
[index
] = tl
->packet_count
[index
] + 1;
317 tl
->total
= tl
->total
+ 1;
319 if ((index
+ 1) > tl
->queue_count
)
320 tl
->queue_count
= index
+ 1;
326 get the traffic load value for tid
328 static u32
rs_tl_get_load(struct iwl_lq_sta
*lq_data
, u8 tid
)
330 u32 curr_time
= jiffies_to_msecs(jiffies
);
333 struct iwl_traffic_load
*tl
= NULL
;
335 if (tid
>= TID_MAX_LOAD_COUNT
)
338 tl
= &(lq_data
->load
[tid
]);
340 curr_time
-= curr_time
% TID_ROUND_VALUE
;
342 if (!(tl
->queue_count
))
345 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
346 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
348 /* The history is too long: remove data that is older than */
349 /* TID_MAX_TIME_DIFF */
350 if (index
>= TID_QUEUE_MAX_SIZE
)
351 rs_tl_rm_old_stats(tl
, curr_time
);
356 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv
*priv
,
357 struct iwl_lq_sta
*lq_data
, u8 tid
,
358 struct ieee80211_sta
*sta
)
360 if (rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
361 IWL_DEBUG_HT("Starting Tx agg: STA: %pM tid: %d\n",
363 ieee80211_start_tx_ba_session(priv
->hw
, sta
->addr
, tid
);
367 static void rs_tl_turn_on_agg(struct iwl_priv
*priv
, u8 tid
,
368 struct iwl_lq_sta
*lq_data
,
369 struct ieee80211_sta
*sta
)
371 if ((tid
< TID_MAX_LOAD_COUNT
))
372 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
373 else if (tid
== IWL_AGG_ALL_TID
)
374 for (tid
= 0; tid
< TID_MAX_LOAD_COUNT
; tid
++)
375 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
378 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
380 return !!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
381 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
382 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
);
386 * rs_collect_tx_data - Update the success/failure sliding window
388 * We keep a sliding window of the last 62 packets transmitted
389 * at this rate. window->data contains the bitmask of successful
392 static int rs_collect_tx_data(struct iwl_rate_scale_data
*windows
,
393 int scale_index
, s32 tpt
, int retries
,
396 struct iwl_rate_scale_data
*window
= NULL
;
397 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
400 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
403 /* Select data for current tx bit rate */
404 window
= &(windows
[scale_index
]);
407 * Keep track of only the latest 62 tx frame attempts in this rate's
408 * history window; anything older isn't really relevant any more.
409 * If we have filled up the sliding window, drop the oldest attempt;
410 * if the oldest attempt (highest bit in bitmap) shows "success",
411 * subtract "1" from the success counter (this is the main reason
412 * we keep these bitmaps!).
414 while (retries
> 0) {
415 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
417 /* remove earliest */
418 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
420 if (window
->data
& mask
) {
421 window
->data
&= ~mask
;
422 window
->success_counter
--;
426 /* Increment frames-attempted counter */
429 /* Shift bitmap by one frame (throw away oldest history),
430 * OR in "1", and increment "success" if this
431 * frame was successful. */
434 window
->success_counter
++;
442 /* Calculate current success ratio, avoid divide-by-0! */
443 if (window
->counter
> 0)
444 window
->success_ratio
= 128 * (100 * window
->success_counter
)
447 window
->success_ratio
= IWL_INVALID_VALUE
;
449 fail_count
= window
->counter
- window
->success_counter
;
451 /* Calculate average throughput, if we have enough history. */
452 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
453 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
454 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
456 window
->average_tpt
= IWL_INVALID_VALUE
;
458 /* Tag this window as having been updated */
459 window
->stamp
= jiffies
;
465 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
467 /* FIXME:RS:remove this function and put the flags statically in the table */
468 static u32
rate_n_flags_from_tbl(struct iwl_scale_tbl_info
*tbl
,
469 int index
, u8 use_green
)
471 u32 rate_n_flags
= 0;
473 if (is_legacy(tbl
->lq_type
)) {
474 rate_n_flags
= iwl_rates
[index
].plcp
;
475 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
476 rate_n_flags
|= RATE_MCS_CCK_MSK
;
478 } else if (is_Ht(tbl
->lq_type
)) {
479 if (index
> IWL_LAST_OFDM_RATE
) {
480 IWL_ERROR("invalid HT rate index %d\n", index
);
481 index
= IWL_LAST_OFDM_RATE
;
483 rate_n_flags
= RATE_MCS_HT_MSK
;
485 if (is_siso(tbl
->lq_type
))
486 rate_n_flags
|= iwl_rates
[index
].plcp_siso
;
487 else if (is_mimo2(tbl
->lq_type
))
488 rate_n_flags
|= iwl_rates
[index
].plcp_mimo2
;
490 rate_n_flags
|= iwl_rates
[index
].plcp_mimo3
;
492 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl
->lq_type
);
495 rate_n_flags
|= ((tbl
->ant_type
<< RATE_MCS_ANT_POS
) &
496 RATE_MCS_ANT_ABC_MSK
);
498 if (is_Ht(tbl
->lq_type
)) {
501 rate_n_flags
|= RATE_MCS_DUP_MSK
;
503 rate_n_flags
|= RATE_MCS_FAT_MSK
;
506 rate_n_flags
|= RATE_MCS_SGI_MSK
;
509 rate_n_flags
|= RATE_MCS_GF_MSK
;
510 if (is_siso(tbl
->lq_type
) && tbl
->is_SGI
) {
511 rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
512 IWL_ERROR("GF was set with SGI:SISO\n");
520 * Interpret uCode API's rate_n_flags format,
521 * fill "search" or "active" tx mode table.
523 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags
,
524 enum ieee80211_band band
,
525 struct iwl_scale_tbl_info
*tbl
,
528 u32 ant_msk
= (rate_n_flags
& RATE_MCS_ANT_ABC_MSK
);
529 u8 num_of_ant
= get_num_of_ant_from_rate(rate_n_flags
);
532 *rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
534 if (*rate_idx
== IWL_RATE_INVALID
) {
538 tbl
->is_SGI
= 0; /* default legacy setup */
541 tbl
->ant_type
= (ant_msk
>> RATE_MCS_ANT_POS
);
542 tbl
->lq_type
= LQ_NONE
;
544 /* legacy rate format */
545 if (!(rate_n_flags
& RATE_MCS_HT_MSK
)) {
546 if (num_of_ant
== 1) {
547 if (band
== IEEE80211_BAND_5GHZ
)
554 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
557 if ((rate_n_flags
& RATE_MCS_FAT_MSK
) ||
558 (rate_n_flags
& RATE_MCS_DUP_MSK
))
561 if (rate_n_flags
& RATE_MCS_DUP_MSK
)
564 mcs
= rs_extract_rate(rate_n_flags
);
567 if (mcs
<= IWL_RATE_SISO_60M_PLCP
) {
569 tbl
->lq_type
= LQ_SISO
; /*else NONE*/
571 } else if (mcs
<= IWL_RATE_MIMO2_60M_PLCP
) {
573 tbl
->lq_type
= LQ_MIMO2
;
577 tbl
->lq_type
= LQ_MIMO3
;
583 /* switch to another antenna/antennas and return 1 */
584 /* if no other valid antenna found, return 0 */
585 static int rs_toggle_antenna(u32 valid_ant
, u32
*rate_n_flags
,
586 struct iwl_scale_tbl_info
*tbl
)
590 if (!tbl
->ant_type
|| tbl
->ant_type
> ANT_ABC
)
593 if (!rs_is_valid_ant(valid_ant
, tbl
->ant_type
))
596 new_ant_type
= ant_toggle_lookup
[tbl
->ant_type
];
598 while ((new_ant_type
!= tbl
->ant_type
) &&
599 !rs_is_valid_ant(valid_ant
, new_ant_type
))
600 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
602 if (new_ant_type
== tbl
->ant_type
)
605 tbl
->ant_type
= new_ant_type
;
606 *rate_n_flags
&= ~RATE_MCS_ANT_ABC_MSK
;
607 *rate_n_flags
|= new_ant_type
<< RATE_MCS_ANT_POS
;
611 /* FIXME:RS: in 4965 we don't use greenfield at all */
612 /* FIXME:RS: don't use greenfield for now in TX */
614 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
616 return (conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) &&
617 priv
->current_ht_config
.is_green_field
&&
618 !priv
->current_ht_config
.non_GF_STA_present
;
621 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
627 * rs_get_supported_rates - get the available rates
629 * if management frame or broadcast frame only return
630 * basic available rates.
633 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
634 struct ieee80211_hdr
*hdr
,
635 enum iwl_table_type rate_type
)
637 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
638 lq_sta
->active_rate_basic
)
639 return lq_sta
->active_rate_basic
;
641 if (is_legacy(rate_type
)) {
642 return lq_sta
->active_legacy_rate
;
644 if (is_siso(rate_type
))
645 return lq_sta
->active_siso_rate
;
646 else if (is_mimo2(rate_type
))
647 return lq_sta
->active_mimo2_rate
;
649 return lq_sta
->active_mimo3_rate
;
653 static u16
rs_get_adjacent_rate(struct iwl_priv
*priv
, u8 index
, u16 rate_mask
,
656 u8 high
= IWL_RATE_INVALID
;
657 u8 low
= IWL_RATE_INVALID
;
659 /* 802.11A or ht walks to the next literal adjacent rate in
661 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
665 /* Find the previous rate that is in the rate mask */
667 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
668 if (rate_mask
& mask
) {
674 /* Find the next rate that is in the rate mask */
676 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
677 if (rate_mask
& mask
) {
683 return (high
<< 8) | low
;
687 while (low
!= IWL_RATE_INVALID
) {
688 low
= iwl_rates
[low
].prev_rs
;
689 if (low
== IWL_RATE_INVALID
)
691 if (rate_mask
& (1 << low
))
693 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low
);
697 while (high
!= IWL_RATE_INVALID
) {
698 high
= iwl_rates
[high
].next_rs
;
699 if (high
== IWL_RATE_INVALID
)
701 if (rate_mask
& (1 << high
))
703 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high
);
706 return (high
<< 8) | low
;
709 static u32
rs_get_lower_rate(struct iwl_lq_sta
*lq_sta
,
710 struct iwl_scale_tbl_info
*tbl
,
711 u8 scale_index
, u8 ht_possible
)
716 u8 switch_to_legacy
= 0;
717 u8 is_green
= lq_sta
->is_green
;
719 /* check if we need to switch from HT to legacy rates.
720 * assumption is that mandatory rates (1Mbps or 6Mbps)
721 * are always supported (spec demand) */
722 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
723 switch_to_legacy
= 1;
724 scale_index
= rs_ht_to_legacy
[scale_index
];
725 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
730 if (num_of_ant(tbl
->ant_type
) > 1)
731 tbl
->ant_type
= ANT_A
;/*FIXME:RS*/
737 rate_mask
= rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
);
739 /* Mask with station rate restriction */
740 if (is_legacy(tbl
->lq_type
)) {
741 /* supp_rates has no CCK bits in A mode */
742 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
743 rate_mask
= (u16
)(rate_mask
&
744 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
746 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
749 /* If we switched from HT to legacy, check current rate */
750 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
755 high_low
= rs_get_adjacent_rate(lq_sta
->drv
, scale_index
, rate_mask
,
757 low
= high_low
& 0xff;
759 if (low
== IWL_RATE_INVALID
)
763 return rate_n_flags_from_tbl(tbl
, low
, is_green
);
767 * mac80211 sends us Tx status
769 static void rs_tx_status(void *priv_r
, struct ieee80211_supported_band
*sband
,
770 struct ieee80211_sta
*sta
, void *priv_sta
,
775 int rs_index
, index
= 0;
776 struct iwl_lq_sta
*lq_sta
;
777 struct iwl_link_quality_cmd
*table
;
778 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
779 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
780 struct ieee80211_hw
*hw
= priv
->hw
;
781 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
782 struct iwl_rate_scale_data
*window
= NULL
;
783 struct iwl_rate_scale_data
*search_win
= NULL
;
785 struct iwl_scale_tbl_info tbl_type
;
786 struct iwl_scale_tbl_info
*curr_tbl
, *search_tbl
;
788 __le16 fc
= hdr
->frame_control
;
791 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
793 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
))
796 /* This packet was aggregated but doesn't carry rate scale info */
797 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
798 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
801 retries
= info
->status
.rates
[0].count
- 1;
806 lq_sta
= (struct iwl_lq_sta
*)priv_sta
;
808 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
809 !lq_sta
->ibss_sta_added
)
813 active_index
= lq_sta
->active_tbl
;
815 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
816 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
817 window
= (struct iwl_rate_scale_data
*)&(curr_tbl
->win
[0]);
818 search_win
= (struct iwl_rate_scale_data
*)&(search_tbl
->win
[0]);
821 * Ignore this Tx frame response if its initial rate doesn't match
822 * that of latest Link Quality command. There may be stragglers
823 * from a previous Link Quality command, but we're no longer interested
824 * in those; they're either from the "active" mode while we're trying
825 * to check "search" mode, or a prior "search" mode after we've moved
826 * to a new "search" mode (which might become the new "active" mode).
828 tx_rate
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
829 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
830 if (priv
->band
== IEEE80211_BAND_5GHZ
)
831 rs_index
-= IWL_FIRST_OFDM_RATE
;
833 if ((info
->status
.rates
[0].idx
< 0) ||
834 (tbl_type
.is_SGI
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_SHORT_GI
)) ||
835 (tbl_type
.is_fat
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_40_MHZ_WIDTH
)) ||
836 (tbl_type
.is_dup
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_DUP_DATA
)) ||
837 (tbl_type
.ant_type
!= info
->antenna_sel_tx
) ||
838 (!!(tx_rate
& RATE_MCS_HT_MSK
) != !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) ||
839 (!!(tx_rate
& RATE_MCS_GF_MSK
) != !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_GREEN_FIELD
)) ||
840 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
841 hw
->wiphy
->bands
[info
->band
]->bitrates
[info
->status
.rates
[0].idx
].bitrate
)) {
842 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate
);
846 /* Update frame history window with "failure" for each Tx retry. */
848 /* Look up the rate and other info used for each tx attempt.
849 * Each tx attempt steps one entry deeper in the rate table. */
850 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
851 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
,
852 &tbl_type
, &rs_index
);
854 /* If type matches "search" table,
855 * add failure to "search" history */
856 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
857 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
858 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
859 if (search_tbl
->expected_tpt
)
860 tpt
= search_tbl
->expected_tpt
[rs_index
];
863 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
865 /* Else if type matches "current/active" table,
866 * add failure to "current/active" history */
867 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
868 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
869 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
870 if (curr_tbl
->expected_tpt
)
871 tpt
= curr_tbl
->expected_tpt
[rs_index
];
874 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
877 /* If not searching for a new mode, increment failed counter
878 * ... this helps determine when to start searching again */
879 if (lq_sta
->stay_in_tbl
)
880 lq_sta
->total_failed
++;
887 * Find (by rate) the history window to update with final Tx attempt;
888 * if Tx was successful first try, use original rate,
889 * else look up the rate that was, finally, successful.
891 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
892 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
894 /* Update frame history window with "success" if Tx got ACKed ... */
895 status
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
897 /* If type matches "search" table,
898 * add final tx status to "search" history */
899 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
900 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
901 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
902 if (search_tbl
->expected_tpt
)
903 tpt
= search_tbl
->expected_tpt
[rs_index
];
906 if (info
->flags
& IEEE80211_TX_CTL_AMPDU
)
907 rs_collect_tx_data(search_win
, rs_index
, tpt
,
908 info
->status
.ampdu_ack_len
,
909 info
->status
.ampdu_ack_map
);
911 rs_collect_tx_data(search_win
, rs_index
, tpt
,
913 /* Else if type matches "current/active" table,
914 * add final tx status to "current/active" history */
915 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
916 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
917 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
918 if (curr_tbl
->expected_tpt
)
919 tpt
= curr_tbl
->expected_tpt
[rs_index
];
922 if (info
->flags
& IEEE80211_TX_CTL_AMPDU
)
923 rs_collect_tx_data(window
, rs_index
, tpt
,
924 info
->status
.ampdu_ack_len
,
925 info
->status
.ampdu_ack_map
);
927 rs_collect_tx_data(window
, rs_index
, tpt
,
931 /* If not searching for new mode, increment success/failed counter
932 * ... these help determine when to start searching again */
933 if (lq_sta
->stay_in_tbl
) {
934 if (info
->flags
& IEEE80211_TX_CTL_AMPDU
) {
935 lq_sta
->total_success
+= info
->status
.ampdu_ack_map
;
936 lq_sta
->total_failed
+=
937 (info
->status
.ampdu_ack_len
- info
->status
.ampdu_ack_map
);
940 lq_sta
->total_success
++;
942 lq_sta
->total_failed
++;
946 /* See if there's a better rate or modulation mode to try. */
947 rs_rate_scale_perform(priv
, hdr
, sta
, lq_sta
);
953 * Begin a period of staying with a selected modulation mode.
954 * Set "stay_in_tbl" flag to prevent any mode switches.
955 * Set frame tx success limits according to legacy vs. high-throughput,
956 * and reset overall (spanning all rates) tx success history statistics.
957 * These control how long we stay using same modulation mode before
958 * searching for a new mode.
960 static void rs_set_stay_in_table(struct iwl_priv
*priv
, u8 is_legacy
,
961 struct iwl_lq_sta
*lq_sta
)
963 IWL_DEBUG_RATE("we are staying in the same table\n");
964 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
966 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
967 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
968 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
970 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
971 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
972 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
974 lq_sta
->table_count
= 0;
975 lq_sta
->total_failed
= 0;
976 lq_sta
->total_success
= 0;
980 * Find correct throughput table for given mode of modulation
982 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
983 struct iwl_scale_tbl_info
*tbl
)
985 if (is_legacy(tbl
->lq_type
)) {
986 if (!is_a_band(tbl
->lq_type
))
987 tbl
->expected_tpt
= expected_tpt_G
;
989 tbl
->expected_tpt
= expected_tpt_A
;
990 } else if (is_siso(tbl
->lq_type
)) {
991 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
993 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
995 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
996 else if (tbl
->is_SGI
)
997 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
999 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1001 } else if (is_mimo(tbl
->lq_type
)) { /* FIXME:need to separate mimo2/3 */
1002 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1004 tbl
->expected_tpt
= expected_tpt_mimo40MHzSGI
;
1006 tbl
->expected_tpt
= expected_tpt_mimo40MHz
;
1007 else if (tbl
->is_SGI
)
1008 tbl
->expected_tpt
= expected_tpt_mimo20MHzSGI
;
1010 tbl
->expected_tpt
= expected_tpt_mimo20MHz
;
1012 tbl
->expected_tpt
= expected_tpt_G
;
1016 * Find starting rate for new "search" high-throughput mode of modulation.
1017 * Goal is to find lowest expected rate (under perfect conditions) that is
1018 * above the current measured throughput of "active" mode, to give new mode
1019 * a fair chance to prove itself without too many challenges.
1021 * This gets called when transitioning to more aggressive modulation
1022 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1023 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1024 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1025 * bit rate will typically need to increase, but not if performance was bad.
1027 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1028 struct iwl_lq_sta
*lq_sta
,
1029 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1030 u16 rate_mask
, s8 index
)
1032 /* "active" values */
1033 struct iwl_scale_tbl_info
*active_tbl
=
1034 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1035 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1036 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1038 /* expected "search" throughput */
1039 s32
*tpt_tbl
= tbl
->expected_tpt
;
1041 s32 new_rate
, high
, low
, start_hi
;
1045 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1048 high_low
= rs_get_adjacent_rate(priv
, rate
, rate_mask
,
1051 low
= high_low
& 0xff;
1052 high
= (high_low
>> 8) & 0xff;
1055 * Lower the "search" bit rate, to give new "search" mode
1056 * approximately the same throughput as "active" if:
1058 * 1) "Active" mode has been working modestly well (but not
1059 * great), and expected "search" throughput (under perfect
1060 * conditions) at candidate rate is above the actual
1061 * measured "active" throughput (but less than expected
1062 * "active" throughput under perfect conditions).
1064 * 2) "Active" mode has been working perfectly or very well
1065 * and expected "search" throughput (under perfect
1066 * conditions) at candidate rate is above expected
1067 * "active" throughput (under perfect conditions).
1069 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1070 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1071 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1072 (tpt_tbl
[rate
] <= active_tpt
))) ||
1073 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1074 (tpt_tbl
[rate
] > active_tpt
))) {
1076 /* (2nd or later pass)
1077 * If we've already tried to raise the rate, and are
1078 * now trying to lower it, use the higher rate. */
1079 if (start_hi
!= IWL_RATE_INVALID
) {
1080 new_rate
= start_hi
;
1086 /* Loop again with lower rate */
1087 if (low
!= IWL_RATE_INVALID
)
1090 /* Lower rate not available, use the original */
1094 /* Else try to raise the "search" rate to match "active" */
1096 /* (2nd or later pass)
1097 * If we've already tried to lower the rate, and are
1098 * now trying to raise it, use the lower rate. */
1099 if (new_rate
!= IWL_RATE_INVALID
)
1102 /* Loop again with higher rate */
1103 else if (high
!= IWL_RATE_INVALID
) {
1107 /* Higher rate not available, use the original */
1119 * Set up search table for MIMO
1121 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1122 struct iwl_lq_sta
*lq_sta
,
1123 struct ieee80211_conf
*conf
,
1124 struct ieee80211_sta
*sta
,
1125 struct iwl_scale_tbl_info
*tbl
, int index
)
1129 s8 is_green
= lq_sta
->is_green
;
1131 if (!conf
->ht
.enabled
|| !sta
->ht_cap
.ht_supported
)
1134 if (((sta
->ht_cap
.cap
& IEEE80211_HT_CAP_SM_PS
) >> 2)
1135 == WLAN_HT_CAP_SM_PS_STATIC
)
1138 /* Need both Tx chains/antennas to support MIMO */
1139 if (priv
->hw_params
.tx_chains_num
< 2)
1142 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1144 tbl
->lq_type
= LQ_MIMO2
;
1145 tbl
->is_dup
= lq_sta
->is_dup
;
1147 rate_mask
= lq_sta
->active_mimo2_rate
;
1149 if (priv
->current_ht_config
.supported_chan_width
1150 == IWL_CHANNEL_WIDTH_40MHZ
)
1155 /* FIXME: - don't toggle SGI here
1157 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1161 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1167 rs_set_expected_tpt_table(lq_sta
, tbl
);
1169 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1171 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate
, rate_mask
);
1173 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1174 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1178 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, rate
, is_green
);
1180 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1181 tbl
->current_rate
, is_green
);
1186 * Set up search table for SISO
1188 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1189 struct iwl_lq_sta
*lq_sta
,
1190 struct ieee80211_conf
*conf
,
1191 struct ieee80211_sta
*sta
,
1192 struct iwl_scale_tbl_info
*tbl
, int index
)
1195 u8 is_green
= lq_sta
->is_green
;
1198 if (!conf
->ht
.enabled
|| !sta
->ht_cap
.ht_supported
)
1201 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1203 tbl
->is_dup
= lq_sta
->is_dup
;
1204 tbl
->lq_type
= LQ_SISO
;
1206 rate_mask
= lq_sta
->active_siso_rate
;
1208 if (priv
->current_ht_config
.supported_chan_width
1209 == IWL_CHANNEL_WIDTH_40MHZ
)
1214 /* FIXME: - don't toggle SGI here
1216 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1220 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1227 tbl
->is_SGI
= 0; /*11n spec: no SGI in SISO+Greenfield*/
1229 rs_set_expected_tpt_table(lq_sta
, tbl
);
1230 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1232 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1233 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1234 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1238 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, rate
, is_green
);
1239 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1240 tbl
->current_rate
, is_green
);
1245 * Try to switch to new modulation mode from legacy
1247 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1248 struct iwl_lq_sta
*lq_sta
,
1249 struct ieee80211_conf
*conf
,
1250 struct ieee80211_sta
*sta
,
1253 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1254 struct iwl_scale_tbl_info
*search_tbl
=
1255 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1256 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1257 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1258 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1259 u8 start_action
= tbl
->action
;
1260 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1261 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1265 switch (tbl
->action
) {
1266 case IWL_LEGACY_SWITCH_ANTENNA1
:
1267 case IWL_LEGACY_SWITCH_ANTENNA2
:
1268 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1270 lq_sta
->action_counter
++;
1272 if ((tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA1
&&
1273 tx_chains_num
<= 1) ||
1274 (tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA2
&&
1275 tx_chains_num
<= 2))
1278 /* Don't change antenna if success has been great */
1279 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1282 /* Set up search table to try other antenna */
1283 memcpy(search_tbl
, tbl
, sz
);
1285 if (rs_toggle_antenna(valid_tx_ant
,
1286 &search_tbl
->current_rate
, search_tbl
)) {
1287 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1291 case IWL_LEGACY_SWITCH_SISO
:
1292 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1294 /* Set up search table to try SISO */
1295 memcpy(search_tbl
, tbl
, sz
);
1296 search_tbl
->is_SGI
= 0;
1297 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1300 lq_sta
->action_counter
= 0;
1305 case IWL_LEGACY_SWITCH_MIMO2_AB
:
1306 case IWL_LEGACY_SWITCH_MIMO2_AC
:
1307 case IWL_LEGACY_SWITCH_MIMO2_BC
:
1308 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1310 /* Set up search table to try MIMO */
1311 memcpy(search_tbl
, tbl
, sz
);
1312 search_tbl
->is_SGI
= 0;
1314 if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AB
)
1315 search_tbl
->ant_type
= ANT_AB
;
1316 else if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AC
)
1317 search_tbl
->ant_type
= ANT_AC
;
1319 search_tbl
->ant_type
= ANT_BC
;
1321 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1324 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1327 lq_sta
->action_counter
= 0;
1333 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2_BC
)
1334 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1336 if (tbl
->action
== start_action
)
1340 search_tbl
->lq_type
= LQ_NONE
;
1344 lq_sta
->search_better_tbl
= 1;
1346 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2_BC
)
1347 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1353 * Try to switch to new modulation mode from SISO
1355 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1356 struct iwl_lq_sta
*lq_sta
,
1357 struct ieee80211_conf
*conf
,
1358 struct ieee80211_sta
*sta
, int index
)
1360 u8 is_green
= lq_sta
->is_green
;
1361 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1362 struct iwl_scale_tbl_info
*search_tbl
=
1363 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1364 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1365 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1366 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1367 u8 start_action
= tbl
->action
;
1368 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1369 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1373 lq_sta
->action_counter
++;
1374 switch (tbl
->action
) {
1375 case IWL_SISO_SWITCH_ANTENNA1
:
1376 case IWL_SISO_SWITCH_ANTENNA2
:
1377 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1379 if ((tbl
->action
== IWL_SISO_SWITCH_ANTENNA1
&&
1380 tx_chains_num
<= 1) ||
1381 (tbl
->action
== IWL_SISO_SWITCH_ANTENNA2
&&
1382 tx_chains_num
<= 2))
1385 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1388 memcpy(search_tbl
, tbl
, sz
);
1389 if (rs_toggle_antenna(valid_tx_ant
,
1390 &search_tbl
->current_rate
, search_tbl
))
1393 case IWL_SISO_SWITCH_MIMO2_AB
:
1394 case IWL_SISO_SWITCH_MIMO2_AC
:
1395 case IWL_SISO_SWITCH_MIMO2_BC
:
1396 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1397 memcpy(search_tbl
, tbl
, sz
);
1398 search_tbl
->is_SGI
= 0;
1400 if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AB
)
1401 search_tbl
->ant_type
= ANT_AB
;
1402 else if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AC
)
1403 search_tbl
->ant_type
= ANT_AC
;
1405 search_tbl
->ant_type
= ANT_BC
;
1407 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1410 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1415 case IWL_SISO_SWITCH_GI
:
1417 !(priv
->current_ht_config
.sgf
&
1421 !(priv
->current_ht_config
.sgf
&
1425 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1427 memcpy(search_tbl
, tbl
, sz
);
1432 IWL_ERROR("SGI was set in GF+SISO\n");
1434 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1435 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1437 s32 tpt
= lq_sta
->last_tpt
/ 100;
1438 if (tpt
>= search_tbl
->expected_tpt
[index
])
1441 search_tbl
->current_rate
= rate_n_flags_from_tbl(
1442 search_tbl
, index
, is_green
);
1446 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1447 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1449 if (tbl
->action
== start_action
)
1452 search_tbl
->lq_type
= LQ_NONE
;
1456 lq_sta
->search_better_tbl
= 1;
1458 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1459 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1464 * Try to switch to new modulation mode from MIMO
1466 static int rs_move_mimo_to_other(struct iwl_priv
*priv
,
1467 struct iwl_lq_sta
*lq_sta
,
1468 struct ieee80211_conf
*conf
,
1469 struct ieee80211_sta
*sta
, int index
)
1471 s8 is_green
= lq_sta
->is_green
;
1472 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1473 struct iwl_scale_tbl_info
*search_tbl
=
1474 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1475 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1476 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1477 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1478 u8 start_action
= tbl
->action
;
1479 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1480 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1484 lq_sta
->action_counter
++;
1485 switch (tbl
->action
) {
1486 case IWL_MIMO2_SWITCH_ANTENNA1
:
1487 case IWL_MIMO2_SWITCH_ANTENNA2
:
1488 IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1490 if (tx_chains_num
<= 2)
1493 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1496 memcpy(search_tbl
, tbl
, sz
);
1497 if (rs_toggle_antenna(valid_tx_ant
,
1498 &search_tbl
->current_rate
, search_tbl
))
1501 case IWL_MIMO2_SWITCH_SISO_A
:
1502 case IWL_MIMO2_SWITCH_SISO_B
:
1503 case IWL_MIMO2_SWITCH_SISO_C
:
1504 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1506 /* Set up new search table for SISO */
1507 memcpy(search_tbl
, tbl
, sz
);
1509 if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_A
)
1510 search_tbl
->ant_type
= ANT_A
;
1511 else if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_B
)
1512 search_tbl
->ant_type
= ANT_B
;
1514 search_tbl
->ant_type
= ANT_C
;
1516 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1519 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1526 case IWL_MIMO2_SWITCH_GI
:
1528 !(priv
->current_ht_config
.sgf
&
1532 !(priv
->current_ht_config
.sgf
&
1536 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1538 /* Set up new search table for MIMO */
1539 memcpy(search_tbl
, tbl
, sz
);
1540 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1541 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1543 * If active table already uses the fastest possible
1544 * modulation (dual stream with short guard interval),
1545 * and it's working well, there's no need to look
1546 * for a better type of modulation!
1549 s32 tpt
= lq_sta
->last_tpt
/ 100;
1550 if (tpt
>= search_tbl
->expected_tpt
[index
])
1553 search_tbl
->current_rate
= rate_n_flags_from_tbl(
1554 search_tbl
, index
, is_green
);
1559 if (tbl
->action
> IWL_MIMO2_SWITCH_GI
)
1560 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1562 if (tbl
->action
== start_action
)
1565 search_tbl
->lq_type
= LQ_NONE
;
1568 lq_sta
->search_better_tbl
= 1;
1570 if (tbl
->action
> IWL_MIMO2_SWITCH_GI
)
1571 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1577 * Check whether we should continue using same modulation mode, or
1578 * begin search for a new mode, based on:
1579 * 1) # tx successes or failures while using this mode
1580 * 2) # times calling this function
1581 * 3) elapsed time in this mode (not used, for now)
1583 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
)
1585 struct iwl_scale_tbl_info
*tbl
;
1588 int flush_interval_passed
= 0;
1589 struct iwl_priv
*priv
;
1592 active_tbl
= lq_sta
->active_tbl
;
1594 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1596 /* If we've been disallowing search, see if we should now allow it */
1597 if (lq_sta
->stay_in_tbl
) {
1599 /* Elapsed time using current modulation mode */
1600 if (lq_sta
->flush_timer
)
1601 flush_interval_passed
=
1603 (unsigned long)(lq_sta
->flush_timer
+
1604 IWL_RATE_SCALE_FLUSH_INTVL
));
1607 * Check if we should allow search for new modulation mode.
1608 * If many frames have failed or succeeded, or we've used
1609 * this same modulation for a long time, allow search, and
1610 * reset history stats that keep track of whether we should
1611 * allow a new search. Also (below) reset all bitmaps and
1612 * stats in active history.
1614 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1615 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1616 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1617 && (flush_interval_passed
))) {
1618 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1619 lq_sta
->total_failed
,
1620 lq_sta
->total_success
,
1621 flush_interval_passed
);
1623 /* Allow search for new mode */
1624 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1625 lq_sta
->total_failed
= 0;
1626 lq_sta
->total_success
= 0;
1627 lq_sta
->flush_timer
= 0;
1630 * Else if we've used this modulation mode enough repetitions
1631 * (regardless of elapsed time or success/failure), reset
1632 * history bitmaps and rate-specific stats for all rates in
1636 lq_sta
->table_count
++;
1637 if (lq_sta
->table_count
>=
1638 lq_sta
->table_count_limit
) {
1639 lq_sta
->table_count
= 0;
1641 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1642 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1643 rs_rate_scale_clear_window(
1648 /* If transitioning to allow "search", reset all history
1649 * bitmaps and stats in active table (this will become the new
1650 * "search" table). */
1651 if (!lq_sta
->stay_in_tbl
) {
1652 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1653 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1659 * Do rate scaling and search for new modulation mode.
1661 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
1662 struct ieee80211_hdr
*hdr
,
1663 struct ieee80211_sta
*sta
,
1664 struct iwl_lq_sta
*lq_sta
)
1666 struct ieee80211_hw
*hw
= priv
->hw
;
1667 struct ieee80211_conf
*conf
= &hw
->conf
;
1668 int low
= IWL_RATE_INVALID
;
1669 int high
= IWL_RATE_INVALID
;
1672 struct iwl_rate_scale_data
*window
= NULL
;
1673 int current_tpt
= IWL_INVALID_VALUE
;
1674 int low_tpt
= IWL_INVALID_VALUE
;
1675 int high_tpt
= IWL_INVALID_VALUE
;
1677 s8 scale_action
= 0;
1681 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
1682 u16 rate_scale_index_msk
= 0;
1689 u8 tid
= MAX_TID_COUNT
;
1691 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1693 fc
= hdr
->frame_control
;
1694 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
)) {
1695 /* Send management frames and broadcast/multicast data using
1697 /* TODO: this could probably be improved.. */
1701 if (!sta
|| !lq_sta
)
1704 lq_sta
->supp_rates
= sta
->supp_rates
[lq_sta
->band
];
1706 tid
= rs_tl_add_packet(lq_sta
, hdr
);
1709 * Select rate-scale / modulation-mode table to work with in
1710 * the rest of this function: "search" if searching for better
1711 * modulation mode, or "active" if doing rate scaling within a mode.
1713 if (!lq_sta
->search_better_tbl
)
1714 active_tbl
= lq_sta
->active_tbl
;
1716 active_tbl
= 1 - lq_sta
->active_tbl
;
1718 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1719 is_green
= lq_sta
->is_green
;
1721 /* current tx rate */
1722 index
= lq_sta
->last_txrate_idx
;
1724 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index
,
1727 /* rates available for this association, and for modulation mode */
1728 rate_mask
= rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
);
1730 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask
);
1732 /* mask with station rate restriction */
1733 if (is_legacy(tbl
->lq_type
)) {
1734 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1735 /* supp_rates has no CCK bits in A mode */
1736 rate_scale_index_msk
= (u16
) (rate_mask
&
1737 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
1739 rate_scale_index_msk
= (u16
) (rate_mask
&
1740 lq_sta
->supp_rates
);
1743 rate_scale_index_msk
= rate_mask
;
1745 if (!rate_scale_index_msk
)
1746 rate_scale_index_msk
= rate_mask
;
1748 if (!((1 << index
) & rate_scale_index_msk
)) {
1749 IWL_ERROR("Current Rate is not valid\n");
1753 /* Get expected throughput table and history window for current rate */
1754 if (!tbl
->expected_tpt
) {
1755 IWL_ERROR("tbl->expected_tpt is NULL\n");
1759 window
= &(tbl
->win
[index
]);
1762 * If there is not enough history to calculate actual average
1763 * throughput, keep analyzing results of more tx frames, without
1764 * changing rate or mode (bypass most of the rest of this function).
1765 * Set up new rate table in uCode only if old rate is not supported
1766 * in current association (use new rate found above).
1768 fail_count
= window
->counter
- window
->success_counter
;
1769 if ((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
1770 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
)) {
1771 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1773 window
->success_counter
, window
->counter
, index
);
1775 /* Can't calculate this yet; not enough history */
1776 window
->average_tpt
= IWL_INVALID_VALUE
;
1778 /* Should we stay with this modulation mode,
1779 * or search for a new one? */
1780 rs_stay_in_table(lq_sta
);
1785 /* Else we have enough samples; calculate estimate of
1786 * actual average throughput */
1788 BUG_ON(window
->average_tpt
!= ((window
->success_ratio
*
1789 tbl
->expected_tpt
[index
] + 64) / 128));
1791 /* If we are searching for better modulation mode, check success. */
1792 if (lq_sta
->search_better_tbl
) {
1794 /* If good success, continue using the "search" mode;
1795 * no need to send new link quality command, since we're
1796 * continuing to use the setup that we've been trying. */
1797 if (window
->average_tpt
> lq_sta
->last_tpt
) {
1799 IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1800 "suc=%d cur-tpt=%d old-tpt=%d\n",
1801 window
->success_ratio
,
1802 window
->average_tpt
,
1805 if (!is_legacy(tbl
->lq_type
))
1806 lq_sta
->enable_counter
= 1;
1808 /* Swap tables; "search" becomes "active" */
1809 lq_sta
->active_tbl
= active_tbl
;
1810 current_tpt
= window
->average_tpt
;
1812 /* Else poor success; go back to mode in "active" table */
1815 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1816 "suc=%d cur-tpt=%d old-tpt=%d\n",
1817 window
->success_ratio
,
1818 window
->average_tpt
,
1821 /* Nullify "search" table */
1822 tbl
->lq_type
= LQ_NONE
;
1824 /* Revert to "active" table */
1825 active_tbl
= lq_sta
->active_tbl
;
1826 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1828 /* Revert to "active" rate and throughput info */
1829 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
1830 current_tpt
= lq_sta
->last_tpt
;
1832 /* Need to set up a new rate table in uCode */
1836 /* Either way, we've made a decision; modulation mode
1837 * search is done, allow rate adjustment next time. */
1838 lq_sta
->search_better_tbl
= 0;
1839 done_search
= 1; /* Don't switch modes below! */
1843 /* (Else) not in search of better modulation mode, try for better
1844 * starting rate, while staying in this mode. */
1845 high_low
= rs_get_adjacent_rate(priv
, index
, rate_scale_index_msk
,
1847 low
= high_low
& 0xff;
1848 high
= (high_low
>> 8) & 0xff;
1850 sr
= window
->success_ratio
;
1852 /* Collect measured throughputs for current and adjacent rates */
1853 current_tpt
= window
->average_tpt
;
1854 if (low
!= IWL_RATE_INVALID
)
1855 low_tpt
= tbl
->win
[low
].average_tpt
;
1856 if (high
!= IWL_RATE_INVALID
)
1857 high_tpt
= tbl
->win
[high
].average_tpt
;
1861 /* Too many failures, decrease rate */
1862 if ((sr
<= IWL_RATE_DECREASE_TH
) || (current_tpt
== 0)) {
1863 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1866 /* No throughput measured yet for adjacent rates; try increase. */
1867 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
1868 (high_tpt
== IWL_INVALID_VALUE
)) {
1870 if (high
!= IWL_RATE_INVALID
&& sr
>= IWL_RATE_INCREASE_TH
)
1872 else if (low
!= IWL_RATE_INVALID
)
1876 /* Both adjacent throughputs are measured, but neither one has better
1877 * throughput; we're using the best rate, don't change it! */
1878 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1879 (high_tpt
!= IWL_INVALID_VALUE
) &&
1880 (low_tpt
< current_tpt
) &&
1881 (high_tpt
< current_tpt
))
1884 /* At least one adjacent rate's throughput is measured,
1885 * and may have better performance. */
1887 /* Higher adjacent rate's throughput is measured */
1888 if (high_tpt
!= IWL_INVALID_VALUE
) {
1889 /* Higher rate has better throughput */
1890 if (high_tpt
> current_tpt
&&
1891 sr
>= IWL_RATE_INCREASE_TH
) {
1895 ("decrease rate because of high tpt\n");
1899 /* Lower adjacent rate's throughput is measured */
1900 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
1901 /* Lower rate has better throughput */
1902 if (low_tpt
> current_tpt
) {
1904 ("decrease rate because of low tpt\n");
1906 } else if (sr
>= IWL_RATE_INCREASE_TH
) {
1912 /* Sanity check; asked for decrease, but success rate or throughput
1913 * has been good at old rate. Don't change it. */
1914 if ((scale_action
== -1) && (low
!= IWL_RATE_INVALID
) &&
1915 ((sr
> IWL_RATE_HIGH_TH
) ||
1916 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
1919 switch (scale_action
) {
1921 /* Decrease starting rate, update uCode's rate table */
1922 if (low
!= IWL_RATE_INVALID
) {
1928 /* Increase starting rate, update uCode's rate table */
1929 if (high
!= IWL_RATE_INVALID
) {
1941 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1942 "high %d type %d\n",
1943 index
, scale_action
, low
, high
, tbl
->lq_type
);
1946 /* Replace uCode's rate table for the destination station. */
1948 rate
= rate_n_flags_from_tbl(tbl
, index
, is_green
);
1949 rs_fill_link_cmd(priv
, lq_sta
, rate
);
1950 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1953 /* Should we stay with this modulation mode, or search for a new one? */
1954 rs_stay_in_table(lq_sta
);
1957 * Search for new modulation mode if we're:
1958 * 1) Not changing rates right now
1959 * 2) Not just finishing up a search
1960 * 3) Allowing a new search
1962 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
&& window
->counter
) {
1963 /* Save current throughput to compare with "search" throughput*/
1964 lq_sta
->last_tpt
= current_tpt
;
1966 /* Select a new "search" modulation mode to try.
1967 * If one is found, set up the new "search" table. */
1968 if (is_legacy(tbl
->lq_type
))
1969 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
1970 else if (is_siso(tbl
->lq_type
))
1971 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
1973 rs_move_mimo_to_other(priv
, lq_sta
, conf
, sta
, index
);
1975 /* If new "search" mode was selected, set up in uCode table */
1976 if (lq_sta
->search_better_tbl
) {
1977 /* Access the "search" table, clear its history. */
1978 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1979 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1980 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1982 /* Use new "search" start rate */
1983 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
1985 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1986 tbl
->current_rate
, index
);
1987 rs_fill_link_cmd(priv
, lq_sta
, tbl
->current_rate
);
1988 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1991 /* If the "active" (non-search) mode was legacy,
1992 * and we've tried switching antennas,
1993 * but we haven't been able to try HT modes (not available),
1994 * stay with best antenna legacy modulation for a while
1995 * before next round of mode comparisons. */
1996 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1997 if (is_legacy(tbl1
->lq_type
) && !conf
->ht
.enabled
&&
1998 lq_sta
->action_counter
>= 1) {
1999 lq_sta
->action_counter
= 0;
2000 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2001 rs_set_stay_in_table(priv
, 1, lq_sta
);
2004 /* If we're in an HT mode, and all 3 mode switch actions
2005 * have been tried and compared, stay in this best modulation
2006 * mode for a while before next round of mode comparisons. */
2007 if (lq_sta
->enable_counter
&&
2008 (lq_sta
->action_counter
>= IWL_ACTION_LIMIT
)) {
2009 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2010 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2011 (tid
!= MAX_TID_COUNT
)) {
2012 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid
);
2013 rs_tl_turn_on_agg(priv
, tid
, lq_sta
, sta
);
2015 lq_sta
->action_counter
= 0;
2016 rs_set_stay_in_table(priv
, 0, lq_sta
);
2020 * Else, don't search for a new modulation mode.
2021 * Put new timestamp in stay-in-modulation-mode flush timer if:
2022 * 1) Not changing rates right now
2023 * 2) Not just finishing up a search
2024 * 3) flush timer is empty
2027 if ((!update_lq
) && (!done_search
) && (!lq_sta
->flush_timer
))
2028 lq_sta
->flush_timer
= jiffies
;
2032 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, index
, is_green
);
2034 lq_sta
->last_txrate_idx
= i
;
2040 static void rs_initialize_lq(struct iwl_priv
*priv
,
2041 struct ieee80211_conf
*conf
,
2042 struct ieee80211_sta
*sta
,
2043 struct iwl_lq_sta
*lq_sta
)
2045 struct iwl_scale_tbl_info
*tbl
;
2049 u8 use_green
= rs_use_green(priv
, conf
);
2053 if (!sta
|| !lq_sta
)
2056 i
= lq_sta
->last_txrate_idx
;
2058 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2059 (priv
->iw_mode
== NL80211_IFTYPE_ADHOC
))
2062 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2064 if (!lq_sta
->search_better_tbl
)
2065 active_tbl
= lq_sta
->active_tbl
;
2067 active_tbl
= 1 - lq_sta
->active_tbl
;
2069 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2071 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2074 /* FIXME:RS: This is also wrong in 4965 */
2075 rate
= iwl_rates
[i
].plcp
;
2076 rate
|= RATE_MCS_ANT_B_MSK
;
2077 rate
&= ~RATE_MCS_ANT_A_MSK
;
2079 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2080 rate
|= RATE_MCS_CCK_MSK
;
2082 tbl
->ant_type
= ANT_B
;
2083 rs_get_tbl_info_from_mcs(rate
, priv
->band
, tbl
, &rate_idx
);
2084 if (!rs_is_valid_ant(valid_tx_ant
, tbl
->ant_type
))
2085 rs_toggle_antenna(valid_tx_ant
, &rate
, tbl
);
2087 rate
= rate_n_flags_from_tbl(tbl
, rate_idx
, use_green
);
2088 tbl
->current_rate
= rate
;
2089 rs_set_expected_tpt_table(lq_sta
, tbl
);
2090 rs_fill_link_cmd(NULL
, lq_sta
, rate
);
2091 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2096 static void rs_get_rate(void *priv_r
, struct ieee80211_sta
*sta
, void *priv_sta
,
2097 struct ieee80211_tx_rate_control
*txrc
)
2101 struct sk_buff
*skb
= txrc
->skb
;
2102 struct ieee80211_supported_band
*sband
= txrc
->sband
;
2103 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2104 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2105 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2106 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2108 struct iwl_lq_sta
*lq_sta
;
2110 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2112 /* Send management frames and broadcast/multicast data using lowest
2114 fc
= hdr
->frame_control
;
2115 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
) ||
2116 !sta
|| !priv_sta
) {
2117 info
->control
.rates
[0].idx
= rate_lowest_index(sband
, sta
);
2121 lq_sta
= (struct iwl_lq_sta
*)priv_sta
;
2122 i
= lq_sta
->last_txrate_idx
;
2124 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
2125 !lq_sta
->ibss_sta_added
) {
2126 u8 sta_id
= iwl_find_station(priv
, hdr
->addr1
);
2128 if (sta_id
== IWL_INVALID_STATION
) {
2129 IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2131 sta_id
= iwl_add_station_flags(priv
, hdr
->addr1
,
2132 0, CMD_ASYNC
, NULL
);
2134 if ((sta_id
!= IWL_INVALID_STATION
)) {
2135 lq_sta
->lq
.sta_id
= sta_id
;
2136 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2137 lq_sta
->ibss_sta_added
= 1;
2138 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2142 if ((i
< 0) || (i
> IWL_RATE_COUNT
)) {
2143 info
->control
.rates
[0].idx
= rate_lowest_index(sband
, sta
);
2147 if (sband
->band
== IEEE80211_BAND_5GHZ
)
2148 i
-= IWL_FIRST_OFDM_RATE
;
2149 info
->control
.rates
[0].idx
= i
;
2152 static void *rs_alloc_sta(void *priv_rate
, struct ieee80211_sta
*sta
,
2155 struct iwl_lq_sta
*lq_sta
;
2156 struct iwl_priv
*priv
;
2159 priv
= (struct iwl_priv
*)priv_rate
;
2160 IWL_DEBUG_RATE("create station rate scale window\n");
2162 lq_sta
= kzalloc(sizeof(struct iwl_lq_sta
), gfp
);
2166 lq_sta
->lq
.sta_id
= 0xff;
2169 for (j
= 0; j
< LQ_SIZE
; j
++)
2170 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2171 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2176 static void rs_rate_init(void *priv_r
, struct ieee80211_supported_band
*sband
,
2177 struct ieee80211_sta
*sta
, void *priv_sta
)
2180 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2181 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2182 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2184 lq_sta
->flush_timer
= 0;
2185 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2186 for (j
= 0; j
< LQ_SIZE
; j
++)
2187 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2188 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2190 IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2191 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2192 * the lowest or the highest rate.. Could consider using RSSI from
2193 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2196 lq_sta
->ibss_sta_added
= 0;
2197 if (priv
->iw_mode
== NL80211_IFTYPE_AP
) {
2198 u8 sta_id
= iwl_find_station(priv
, sta
->addr
);
2200 /* for IBSS the call are from tasklet */
2201 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta
->addr
);
2203 if (sta_id
== IWL_INVALID_STATION
) {
2204 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta
->addr
);
2205 sta_id
= iwl_add_station_flags(priv
, sta
->addr
,
2206 0, CMD_ASYNC
, NULL
);
2208 if ((sta_id
!= IWL_INVALID_STATION
)) {
2209 lq_sta
->lq
.sta_id
= sta_id
;
2210 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2212 /* FIXME: this is w/a remove it later */
2213 priv
->assoc_station_added
= 1;
2216 /* Find highest tx rate supported by hardware and destination station */
2217 lq_sta
->last_txrate_idx
= 3;
2218 for (i
= 0; i
< sband
->n_bitrates
; i
++)
2219 if (sta
->supp_rates
[sband
->band
] & BIT(i
))
2220 lq_sta
->last_txrate_idx
= i
;
2222 /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2223 if (sband
->band
== IEEE80211_BAND_5GHZ
)
2224 lq_sta
->last_txrate_idx
+= IWL_FIRST_OFDM_RATE
;
2227 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2228 lq_sta
->active_legacy_rate
= priv
->active_rate
& ~(0x1000);
2229 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2230 lq_sta
->band
= priv
->band
;
2232 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2233 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2235 lq_sta
->active_siso_rate
= sta
->ht_cap
.mcs
.rx_mask
[0] << 1;
2236 lq_sta
->active_siso_rate
|= sta
->ht_cap
.mcs
.rx_mask
[0] & 0x1;
2237 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2238 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2241 lq_sta
->active_mimo2_rate
= sta
->ht_cap
.mcs
.rx_mask
[1] << 1;
2242 lq_sta
->active_mimo2_rate
|= sta
->ht_cap
.mcs
.rx_mask
[1] & 0x1;
2243 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2244 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2246 lq_sta
->active_mimo3_rate
= sta
->ht_cap
.mcs
.rx_mask
[2] << 1;
2247 lq_sta
->active_mimo3_rate
|= sta
->ht_cap
.mcs
.rx_mask
[2] & 0x1;
2248 lq_sta
->active_mimo3_rate
&= ~((u16
)0x2);
2249 lq_sta
->active_mimo3_rate
<<= IWL_FIRST_OFDM_RATE
;
2251 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2252 lq_sta
->active_siso_rate
,
2253 lq_sta
->active_mimo2_rate
,
2254 lq_sta
->active_mimo3_rate
);
2256 /* These values will be overridden later */
2257 lq_sta
->lq
.general_params
.single_stream_ant_msk
= ANT_A
;
2258 lq_sta
->lq
.general_params
.dual_stream_ant_msk
= ANT_AB
;
2260 /* as default allow aggregation for all tids */
2261 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2264 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2267 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
2268 struct iwl_lq_sta
*lq_sta
, u32 new_rate
)
2270 struct iwl_scale_tbl_info tbl_type
;
2273 int repeat_rate
= 0;
2274 u8 ant_toggle_cnt
= 0;
2275 u8 use_ht_possible
= 1;
2276 u8 valid_tx_ant
= 0;
2277 struct iwl_link_quality_cmd
*lq_cmd
= &lq_sta
->lq
;
2279 /* Override starting rate (index 0) if needed for debug purposes */
2280 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2282 /* Interpret new_rate (rate_n_flags) */
2283 memset(&tbl_type
, 0, sizeof(tbl_type
));
2284 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
,
2285 &tbl_type
, &rate_idx
);
2287 /* How many times should we repeat the initial rate? */
2288 if (is_legacy(tbl_type
.lq_type
)) {
2290 repeat_rate
= IWL_NUMBER_TRY
;
2292 repeat_rate
= IWL_HT_NUMBER_TRY
;
2295 lq_cmd
->general_params
.mimo_delimiter
=
2296 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2298 /* Fill 1st table entry (index 0) */
2299 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2301 if (num_of_ant(tbl_type
.ant_type
) == 1) {
2302 lq_cmd
->general_params
.single_stream_ant_msk
=
2304 } else if (num_of_ant(tbl_type
.ant_type
) == 2) {
2305 lq_cmd
->general_params
.dual_stream_ant_msk
=
2307 } /* otherwise we don't modify the existing value */
2313 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2315 /* Fill rest of rate table */
2316 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2317 /* Repeat initial/next rate.
2318 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2319 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2320 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2321 if (is_legacy(tbl_type
.lq_type
)) {
2322 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2325 rs_toggle_antenna(valid_tx_ant
,
2326 &new_rate
, &tbl_type
))
2330 /* Override next rate if needed for debug purposes */
2331 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2333 /* Fill next table entry */
2334 lq_cmd
->rs_table
[index
].rate_n_flags
=
2335 cpu_to_le32(new_rate
);
2340 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
, &tbl_type
,
2343 /* Indicate to uCode which entries might be MIMO.
2344 * If initial rate was MIMO, this will finally end up
2345 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2346 if (is_mimo(tbl_type
.lq_type
))
2347 lq_cmd
->general_params
.mimo_delimiter
= index
;
2350 new_rate
= rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2353 /* How many times should we repeat the next rate? */
2354 if (is_legacy(tbl_type
.lq_type
)) {
2355 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2358 rs_toggle_antenna(valid_tx_ant
,
2359 &new_rate
, &tbl_type
))
2362 repeat_rate
= IWL_NUMBER_TRY
;
2364 repeat_rate
= IWL_HT_NUMBER_TRY
;
2367 /* Don't allow HT rates after next pass.
2368 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2369 use_ht_possible
= 0;
2371 /* Override next rate if needed for debug purposes */
2372 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2374 /* Fill next table entry */
2375 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2381 lq_cmd
->agg_params
.agg_frame_cnt_limit
= 64;
2382 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2383 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2386 static void *rs_alloc(struct ieee80211_hw
*hw
, struct dentry
*debugfsdir
)
2390 /* rate scale requires free function to be implemented */
2391 static void rs_free(void *priv_rate
)
2396 static void rs_free_sta(void *priv_r
, struct ieee80211_sta
*sta
,
2399 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2400 struct iwl_priv
*priv __maybe_unused
= priv_r
;
2402 IWL_DEBUG_RATE("enter\n");
2404 IWL_DEBUG_RATE("leave\n");
2408 #ifdef CONFIG_MAC80211_DEBUGFS
2409 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2411 file
->private_data
= inode
->i_private
;
2414 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
2415 u32
*rate_n_flags
, int index
)
2417 struct iwl_priv
*priv
;
2420 if (lq_sta
->dbg_fixed_rate
) {
2422 *rate_n_flags
= lq_sta
->dbg_fixed_rate
;
2424 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2425 *rate_n_flags
= 0x800D;
2427 *rate_n_flags
= 0x820A;
2429 IWL_DEBUG_RATE("Fixed rate ON\n");
2431 IWL_DEBUG_RATE("Fixed rate OFF\n");
2435 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2436 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2438 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2439 struct iwl_priv
*priv
;
2445 memset(buf
, 0, sizeof(buf
));
2446 buf_size
= min(count
, sizeof(buf
) - 1);
2447 if (copy_from_user(buf
, user_buf
, buf_size
))
2450 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2451 lq_sta
->dbg_fixed_rate
= parsed_rate
;
2453 lq_sta
->dbg_fixed_rate
= 0;
2455 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2456 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2457 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2458 lq_sta
->active_mimo3_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2460 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2461 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed_rate
);
2463 if (lq_sta
->dbg_fixed_rate
) {
2464 rs_fill_link_cmd(NULL
, lq_sta
, lq_sta
->dbg_fixed_rate
);
2465 iwl_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2471 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2472 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2478 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2480 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2481 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2482 lq_sta
->total_failed
, lq_sta
->total_success
,
2483 lq_sta
->active_legacy_rate
);
2484 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2485 lq_sta
->dbg_fixed_rate
);
2486 desc
+= sprintf(buff
+desc
, "general:"
2487 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2488 lq_sta
->lq
.general_params
.flags
,
2489 lq_sta
->lq
.general_params
.mimo_delimiter
,
2490 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2491 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2493 desc
+= sprintf(buff
+desc
, "agg:"
2494 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2495 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2496 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2497 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2499 desc
+= sprintf(buff
+desc
,
2500 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2501 lq_sta
->lq
.general_params
.start_rate_index
[0],
2502 lq_sta
->lq
.general_params
.start_rate_index
[1],
2503 lq_sta
->lq
.general_params
.start_rate_index
[2],
2504 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2507 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
2508 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X\n",
2509 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2511 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2514 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2515 .write
= rs_sta_dbgfs_scale_table_write
,
2516 .read
= rs_sta_dbgfs_scale_table_read
,
2517 .open
= open_file_generic
,
2519 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2520 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2526 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2527 for (i
= 0; i
< LQ_SIZE
; i
++) {
2528 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2530 lq_sta
->active_tbl
== i
?"*":"x",
2531 lq_sta
->lq_info
[i
].lq_type
,
2532 lq_sta
->lq_info
[i
].is_SGI
,
2533 lq_sta
->lq_info
[i
].is_fat
,
2534 lq_sta
->lq_info
[i
].is_dup
,
2535 lq_sta
->lq_info
[i
].current_rate
);
2536 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2537 desc
+= sprintf(buff
+desc
,
2538 "counter=%d success=%d %%=%d\n",
2539 lq_sta
->lq_info
[i
].win
[j
].counter
,
2540 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2541 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2544 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2547 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2548 .read
= rs_sta_dbgfs_stats_table_read
,
2549 .open
= open_file_generic
,
2552 static void rs_add_debugfs(void *priv
, void *priv_sta
,
2555 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2556 lq_sta
->rs_sta_dbgfs_scale_table_file
=
2557 debugfs_create_file("rate_scale_table", 0600, dir
,
2558 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
2559 lq_sta
->rs_sta_dbgfs_stats_table_file
=
2560 debugfs_create_file("rate_stats_table", 0600, dir
,
2561 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
2562 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
2563 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
2564 &lq_sta
->tx_agg_tid_en
);
2568 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
2570 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2571 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
2572 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
2573 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
2577 static struct rate_control_ops rs_ops
= {
2580 .tx_status
= rs_tx_status
,
2581 .get_rate
= rs_get_rate
,
2582 .rate_init
= rs_rate_init
,
2585 .alloc_sta
= rs_alloc_sta
,
2586 .free_sta
= rs_free_sta
,
2587 #ifdef CONFIG_MAC80211_DEBUGFS
2588 .add_sta_debugfs
= rs_add_debugfs
,
2589 .remove_sta_debugfs
= rs_remove_debugfs
,
2593 int iwlagn_rate_control_register(void)
2595 return ieee80211_rate_control_register(&rs_ops
);
2598 void iwlagn_rate_control_unregister(void)
2600 ieee80211_rate_control_unregister(&rs_ops
);