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 spearate 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 DECLARE_MAC_BUF(mac
);
362 if (rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
363 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
364 print_mac(mac
, sta
->addr
), tid
);
365 ieee80211_start_tx_ba_session(priv
->hw
, sta
->addr
, tid
);
369 static void rs_tl_turn_on_agg(struct iwl_priv
*priv
, u8 tid
,
370 struct iwl_lq_sta
*lq_data
,
371 struct ieee80211_sta
*sta
)
373 if ((tid
< TID_MAX_LOAD_COUNT
))
374 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
375 else if (tid
== IWL_AGG_ALL_TID
)
376 for (tid
= 0; tid
< TID_MAX_LOAD_COUNT
; tid
++)
377 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
380 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
382 return !!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
383 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
384 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
);
388 * rs_collect_tx_data - Update the success/failure sliding window
390 * We keep a sliding window of the last 62 packets transmitted
391 * at this rate. window->data contains the bitmask of successful
394 static int rs_collect_tx_data(struct iwl_rate_scale_data
*windows
,
395 int scale_index
, s32 tpt
, int retries
,
398 struct iwl_rate_scale_data
*window
= NULL
;
399 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
402 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
405 /* Select data for current tx bit rate */
406 window
= &(windows
[scale_index
]);
409 * Keep track of only the latest 62 tx frame attempts in this rate's
410 * history window; anything older isn't really relevant any more.
411 * If we have filled up the sliding window, drop the oldest attempt;
412 * if the oldest attempt (highest bit in bitmap) shows "success",
413 * subtract "1" from the success counter (this is the main reason
414 * we keep these bitmaps!).
416 while (retries
> 0) {
417 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
419 /* remove earliest */
420 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
422 if (window
->data
& mask
) {
423 window
->data
&= ~mask
;
424 window
->success_counter
--;
428 /* Increment frames-attempted counter */
431 /* Shift bitmap by one frame (throw away oldest history),
432 * OR in "1", and increment "success" if this
433 * frame was successful. */
436 window
->success_counter
++;
444 /* Calculate current success ratio, avoid divide-by-0! */
445 if (window
->counter
> 0)
446 window
->success_ratio
= 128 * (100 * window
->success_counter
)
449 window
->success_ratio
= IWL_INVALID_VALUE
;
451 fail_count
= window
->counter
- window
->success_counter
;
453 /* Calculate average throughput, if we have enough history. */
454 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
455 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
456 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
458 window
->average_tpt
= IWL_INVALID_VALUE
;
460 /* Tag this window as having been updated */
461 window
->stamp
= jiffies
;
467 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
469 /* FIXME:RS:remove this function and put the flags statically in the table */
470 static u32
rate_n_flags_from_tbl(struct iwl_scale_tbl_info
*tbl
,
471 int index
, u8 use_green
)
473 u32 rate_n_flags
= 0;
475 if (is_legacy(tbl
->lq_type
)) {
476 rate_n_flags
= iwl_rates
[index
].plcp
;
477 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
478 rate_n_flags
|= RATE_MCS_CCK_MSK
;
480 } else if (is_Ht(tbl
->lq_type
)) {
481 if (index
> IWL_LAST_OFDM_RATE
) {
482 IWL_ERROR("invalid HT rate index %d\n", index
);
483 index
= IWL_LAST_OFDM_RATE
;
485 rate_n_flags
= RATE_MCS_HT_MSK
;
487 if (is_siso(tbl
->lq_type
))
488 rate_n_flags
|= iwl_rates
[index
].plcp_siso
;
489 else if (is_mimo2(tbl
->lq_type
))
490 rate_n_flags
|= iwl_rates
[index
].plcp_mimo2
;
492 rate_n_flags
|= iwl_rates
[index
].plcp_mimo3
;
494 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl
->lq_type
);
497 rate_n_flags
|= ((tbl
->ant_type
<< RATE_MCS_ANT_POS
) &
498 RATE_MCS_ANT_ABC_MSK
);
500 if (is_Ht(tbl
->lq_type
)) {
503 rate_n_flags
|= RATE_MCS_DUP_MSK
;
505 rate_n_flags
|= RATE_MCS_FAT_MSK
;
508 rate_n_flags
|= RATE_MCS_SGI_MSK
;
511 rate_n_flags
|= RATE_MCS_GF_MSK
;
512 if (is_siso(tbl
->lq_type
) && tbl
->is_SGI
) {
513 rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
514 IWL_ERROR("GF was set with SGI:SISO\n");
522 * Interpret uCode API's rate_n_flags format,
523 * fill "search" or "active" tx mode table.
525 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags
,
526 enum ieee80211_band band
,
527 struct iwl_scale_tbl_info
*tbl
,
530 u32 ant_msk
= (rate_n_flags
& RATE_MCS_ANT_ABC_MSK
);
531 u8 num_of_ant
= get_num_of_ant_from_rate(rate_n_flags
);
534 *rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
536 if (*rate_idx
== IWL_RATE_INVALID
) {
540 tbl
->is_SGI
= 0; /* default legacy setup */
543 tbl
->ant_type
= (ant_msk
>> RATE_MCS_ANT_POS
);
544 tbl
->lq_type
= LQ_NONE
;
546 /* legacy rate format */
547 if (!(rate_n_flags
& RATE_MCS_HT_MSK
)) {
548 if (num_of_ant
== 1) {
549 if (band
== IEEE80211_BAND_5GHZ
)
556 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
559 if ((rate_n_flags
& RATE_MCS_FAT_MSK
) ||
560 (rate_n_flags
& RATE_MCS_DUP_MSK
))
563 if (rate_n_flags
& RATE_MCS_DUP_MSK
)
566 mcs
= rs_extract_rate(rate_n_flags
);
569 if (mcs
<= IWL_RATE_SISO_60M_PLCP
) {
571 tbl
->lq_type
= LQ_SISO
; /*else NONE*/
573 } else if (mcs
<= IWL_RATE_MIMO2_60M_PLCP
) {
575 tbl
->lq_type
= LQ_MIMO2
;
579 tbl
->lq_type
= LQ_MIMO3
;
585 /* switch to another antenna/antennas and return 1 */
586 /* if no other valid antenna found, return 0 */
587 static int rs_toggle_antenna(u32 valid_ant
, u32
*rate_n_flags
,
588 struct iwl_scale_tbl_info
*tbl
)
592 if (!tbl
->ant_type
|| tbl
->ant_type
> ANT_ABC
)
595 if (!rs_is_valid_ant(valid_ant
, tbl
->ant_type
))
598 new_ant_type
= ant_toggle_lookup
[tbl
->ant_type
];
600 while ((new_ant_type
!= tbl
->ant_type
) &&
601 !rs_is_valid_ant(valid_ant
, new_ant_type
))
602 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
604 if (new_ant_type
== tbl
->ant_type
)
607 tbl
->ant_type
= new_ant_type
;
608 *rate_n_flags
&= ~RATE_MCS_ANT_ABC_MSK
;
609 *rate_n_flags
|= new_ant_type
<< RATE_MCS_ANT_POS
;
613 /* FIXME:RS: in 4965 we don't use greenfield at all */
614 /* FIXME:RS: don't use greenfield for now in TX */
616 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
618 return (conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) &&
619 priv
->current_ht_config
.is_green_field
&&
620 !priv
->current_ht_config
.non_GF_STA_present
;
623 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
629 * rs_get_supported_rates - get the available rates
631 * if management frame or broadcast frame only return
632 * basic available rates.
635 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
636 struct ieee80211_hdr
*hdr
,
637 enum iwl_table_type rate_type
)
639 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
640 lq_sta
->active_rate_basic
)
641 return lq_sta
->active_rate_basic
;
643 if (is_legacy(rate_type
)) {
644 return lq_sta
->active_legacy_rate
;
646 if (is_siso(rate_type
))
647 return lq_sta
->active_siso_rate
;
648 else if (is_mimo2(rate_type
))
649 return lq_sta
->active_mimo2_rate
;
651 return lq_sta
->active_mimo3_rate
;
655 static u16
rs_get_adjacent_rate(struct iwl_priv
*priv
, u8 index
, u16 rate_mask
,
658 u8 high
= IWL_RATE_INVALID
;
659 u8 low
= IWL_RATE_INVALID
;
661 /* 802.11A or ht walks to the next literal adjacent rate in
663 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
667 /* Find the previous rate that is in the rate mask */
669 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
670 if (rate_mask
& mask
) {
676 /* Find the next rate that is in the rate mask */
678 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
679 if (rate_mask
& mask
) {
685 return (high
<< 8) | low
;
689 while (low
!= IWL_RATE_INVALID
) {
690 low
= iwl_rates
[low
].prev_rs
;
691 if (low
== IWL_RATE_INVALID
)
693 if (rate_mask
& (1 << low
))
695 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low
);
699 while (high
!= IWL_RATE_INVALID
) {
700 high
= iwl_rates
[high
].next_rs
;
701 if (high
== IWL_RATE_INVALID
)
703 if (rate_mask
& (1 << high
))
705 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high
);
708 return (high
<< 8) | low
;
711 static u32
rs_get_lower_rate(struct iwl_lq_sta
*lq_sta
,
712 struct iwl_scale_tbl_info
*tbl
,
713 u8 scale_index
, u8 ht_possible
)
718 u8 switch_to_legacy
= 0;
719 u8 is_green
= lq_sta
->is_green
;
721 /* check if we need to switch from HT to legacy rates.
722 * assumption is that mandatory rates (1Mbps or 6Mbps)
723 * are always supported (spec demand) */
724 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
725 switch_to_legacy
= 1;
726 scale_index
= rs_ht_to_legacy
[scale_index
];
727 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
732 if (num_of_ant(tbl
->ant_type
) > 1)
733 tbl
->ant_type
= ANT_A
;/*FIXME:RS*/
739 rate_mask
= rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
);
741 /* Mask with station rate restriction */
742 if (is_legacy(tbl
->lq_type
)) {
743 /* supp_rates has no CCK bits in A mode */
744 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
745 rate_mask
= (u16
)(rate_mask
&
746 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
748 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
751 /* If we switched from HT to legacy, check current rate */
752 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
757 high_low
= rs_get_adjacent_rate(lq_sta
->drv
, scale_index
, rate_mask
,
759 low
= high_low
& 0xff;
761 if (low
== IWL_RATE_INVALID
)
765 return rate_n_flags_from_tbl(tbl
, low
, is_green
);
769 * mac80211 sends us Tx status
771 static void rs_tx_status(void *priv_r
, struct ieee80211_supported_band
*sband
,
772 struct ieee80211_sta
*sta
, void *priv_sta
,
777 int rs_index
, index
= 0;
778 struct iwl_lq_sta
*lq_sta
;
779 struct iwl_link_quality_cmd
*table
;
780 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
781 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
782 struct ieee80211_hw
*hw
= priv
->hw
;
783 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
784 struct iwl_rate_scale_data
*window
= NULL
;
785 struct iwl_rate_scale_data
*search_win
= NULL
;
787 struct iwl_scale_tbl_info tbl_type
;
788 struct iwl_scale_tbl_info
*curr_tbl
, *search_tbl
;
790 __le16 fc
= hdr
->frame_control
;
793 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
795 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
))
798 /* This packet was aggregated but doesn't carry rate scale info */
799 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
800 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
803 retries
= info
->status
.retry_count
;
808 lq_sta
= (struct iwl_lq_sta
*)priv_sta
;
810 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
811 !lq_sta
->ibss_sta_added
)
815 active_index
= lq_sta
->active_tbl
;
817 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
818 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
819 window
= (struct iwl_rate_scale_data
*)&(curr_tbl
->win
[0]);
820 search_win
= (struct iwl_rate_scale_data
*)&(search_tbl
->win
[0]);
823 * Ignore this Tx frame response if its initial rate doesn't match
824 * that of latest Link Quality command. There may be stragglers
825 * from a previous Link Quality command, but we're no longer interested
826 * in those; they're either from the "active" mode while we're trying
827 * to check "search" mode, or a prior "search" mode after we've moved
828 * to a new "search" mode (which might become the new "active" mode).
830 tx_rate
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
831 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
832 if (priv
->band
== IEEE80211_BAND_5GHZ
)
833 rs_index
-= IWL_FIRST_OFDM_RATE
;
835 if ((info
->tx_rate_idx
< 0) ||
837 !!(info
->flags
& IEEE80211_TX_CTL_SHORT_GI
)) ||
839 !!(info
->flags
& IEEE80211_TX_CTL_40_MHZ_WIDTH
)) ||
841 !!(info
->flags
& IEEE80211_TX_CTL_DUP_DATA
)) ||
842 (tbl_type
.ant_type
^ info
->antenna_sel_tx
) ||
843 (!!(tx_rate
& RATE_MCS_HT_MSK
) ^
844 !!(info
->flags
& IEEE80211_TX_CTL_OFDM_HT
)) ||
845 (!!(tx_rate
& RATE_MCS_GF_MSK
) ^
846 !!(info
->flags
& IEEE80211_TX_CTL_GREEN_FIELD
)) ||
847 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
848 hw
->wiphy
->bands
[info
->band
]->bitrates
[info
->tx_rate_idx
].bitrate
)) {
849 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate
);
853 /* Update frame history window with "failure" for each Tx retry. */
855 /* Look up the rate and other info used for each tx attempt.
856 * Each tx attempt steps one entry deeper in the rate table. */
857 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
858 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
,
859 &tbl_type
, &rs_index
);
861 /* If type matches "search" table,
862 * add failure to "search" history */
863 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
864 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
865 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
866 if (search_tbl
->expected_tpt
)
867 tpt
= search_tbl
->expected_tpt
[rs_index
];
870 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
872 /* Else if type matches "current/active" table,
873 * add failure to "current/active" history */
874 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
875 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
876 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
877 if (curr_tbl
->expected_tpt
)
878 tpt
= curr_tbl
->expected_tpt
[rs_index
];
881 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
884 /* If not searching for a new mode, increment failed counter
885 * ... this helps determine when to start searching again */
886 if (lq_sta
->stay_in_tbl
)
887 lq_sta
->total_failed
++;
894 * Find (by rate) the history window to update with final Tx attempt;
895 * if Tx was successful first try, use original rate,
896 * else look up the rate that was, finally, successful.
898 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
899 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
901 /* Update frame history window with "success" if Tx got ACKed ... */
902 status
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
904 /* If type matches "search" table,
905 * add final tx status to "search" history */
906 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
907 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
908 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
909 if (search_tbl
->expected_tpt
)
910 tpt
= search_tbl
->expected_tpt
[rs_index
];
913 if (info
->flags
& IEEE80211_TX_CTL_AMPDU
)
914 rs_collect_tx_data(search_win
, rs_index
, tpt
,
915 info
->status
.ampdu_ack_len
,
916 info
->status
.ampdu_ack_map
);
918 rs_collect_tx_data(search_win
, rs_index
, tpt
,
920 /* Else if type matches "current/active" table,
921 * add final tx status to "current/active" history */
922 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
923 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
924 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
925 if (curr_tbl
->expected_tpt
)
926 tpt
= curr_tbl
->expected_tpt
[rs_index
];
929 if (info
->flags
& IEEE80211_TX_CTL_AMPDU
)
930 rs_collect_tx_data(window
, rs_index
, tpt
,
931 info
->status
.ampdu_ack_len
,
932 info
->status
.ampdu_ack_map
);
934 rs_collect_tx_data(window
, rs_index
, tpt
,
938 /* If not searching for new mode, increment success/failed counter
939 * ... these help determine when to start searching again */
940 if (lq_sta
->stay_in_tbl
) {
941 if (info
->flags
& IEEE80211_TX_CTL_AMPDU
) {
942 lq_sta
->total_success
+= info
->status
.ampdu_ack_map
;
943 lq_sta
->total_failed
+=
944 (info
->status
.ampdu_ack_len
- info
->status
.ampdu_ack_map
);
947 lq_sta
->total_success
++;
949 lq_sta
->total_failed
++;
953 /* See if there's a better rate or modulation mode to try. */
954 rs_rate_scale_perform(priv
, hdr
, sta
, lq_sta
);
960 * Begin a period of staying with a selected modulation mode.
961 * Set "stay_in_tbl" flag to prevent any mode switches.
962 * Set frame tx success limits according to legacy vs. high-throughput,
963 * and reset overall (spanning all rates) tx success history statistics.
964 * These control how long we stay using same modulation mode before
965 * searching for a new mode.
967 static void rs_set_stay_in_table(struct iwl_priv
*priv
, u8 is_legacy
,
968 struct iwl_lq_sta
*lq_sta
)
970 IWL_DEBUG_RATE("we are staying in the same table\n");
971 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
973 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
974 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
975 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
977 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
978 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
979 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
981 lq_sta
->table_count
= 0;
982 lq_sta
->total_failed
= 0;
983 lq_sta
->total_success
= 0;
987 * Find correct throughput table for given mode of modulation
989 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
990 struct iwl_scale_tbl_info
*tbl
)
992 if (is_legacy(tbl
->lq_type
)) {
993 if (!is_a_band(tbl
->lq_type
))
994 tbl
->expected_tpt
= expected_tpt_G
;
996 tbl
->expected_tpt
= expected_tpt_A
;
997 } else if (is_siso(tbl
->lq_type
)) {
998 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1000 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
1002 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
1003 else if (tbl
->is_SGI
)
1004 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
1006 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1008 } else if (is_mimo(tbl
->lq_type
)) { /* FIXME:need to separate mimo2/3 */
1009 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1011 tbl
->expected_tpt
= expected_tpt_mimo40MHzSGI
;
1013 tbl
->expected_tpt
= expected_tpt_mimo40MHz
;
1014 else if (tbl
->is_SGI
)
1015 tbl
->expected_tpt
= expected_tpt_mimo20MHzSGI
;
1017 tbl
->expected_tpt
= expected_tpt_mimo20MHz
;
1019 tbl
->expected_tpt
= expected_tpt_G
;
1023 * Find starting rate for new "search" high-throughput mode of modulation.
1024 * Goal is to find lowest expected rate (under perfect conditions) that is
1025 * above the current measured throughput of "active" mode, to give new mode
1026 * a fair chance to prove itself without too many challenges.
1028 * This gets called when transitioning to more aggressive modulation
1029 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1030 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1031 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1032 * bit rate will typically need to increase, but not if performance was bad.
1034 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1035 struct iwl_lq_sta
*lq_sta
,
1036 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1037 u16 rate_mask
, s8 index
)
1039 /* "active" values */
1040 struct iwl_scale_tbl_info
*active_tbl
=
1041 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1042 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1043 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1045 /* expected "search" throughput */
1046 s32
*tpt_tbl
= tbl
->expected_tpt
;
1048 s32 new_rate
, high
, low
, start_hi
;
1052 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1055 high_low
= rs_get_adjacent_rate(priv
, rate
, rate_mask
,
1058 low
= high_low
& 0xff;
1059 high
= (high_low
>> 8) & 0xff;
1062 * Lower the "search" bit rate, to give new "search" mode
1063 * approximately the same throughput as "active" if:
1065 * 1) "Active" mode has been working modestly well (but not
1066 * great), and expected "search" throughput (under perfect
1067 * conditions) at candidate rate is above the actual
1068 * measured "active" throughput (but less than expected
1069 * "active" throughput under perfect conditions).
1071 * 2) "Active" mode has been working perfectly or very well
1072 * and expected "search" throughput (under perfect
1073 * conditions) at candidate rate is above expected
1074 * "active" throughput (under perfect conditions).
1076 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1077 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1078 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1079 (tpt_tbl
[rate
] <= active_tpt
))) ||
1080 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1081 (tpt_tbl
[rate
] > active_tpt
))) {
1083 /* (2nd or later pass)
1084 * If we've already tried to raise the rate, and are
1085 * now trying to lower it, use the higher rate. */
1086 if (start_hi
!= IWL_RATE_INVALID
) {
1087 new_rate
= start_hi
;
1093 /* Loop again with lower rate */
1094 if (low
!= IWL_RATE_INVALID
)
1097 /* Lower rate not available, use the original */
1101 /* Else try to raise the "search" rate to match "active" */
1103 /* (2nd or later pass)
1104 * If we've already tried to lower the rate, and are
1105 * now trying to raise it, use the lower rate. */
1106 if (new_rate
!= IWL_RATE_INVALID
)
1109 /* Loop again with higher rate */
1110 else if (high
!= IWL_RATE_INVALID
) {
1114 /* Higher rate not available, use the original */
1126 * Set up search table for MIMO
1128 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1129 struct iwl_lq_sta
*lq_sta
,
1130 struct ieee80211_conf
*conf
,
1131 struct ieee80211_sta
*sta
,
1132 struct iwl_scale_tbl_info
*tbl
, int index
)
1136 s8 is_green
= lq_sta
->is_green
;
1138 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1139 !sta
->ht_info
.ht_supported
)
1142 if (((sta
->ht_info
.cap
& IEEE80211_HT_CAP_SM_PS
) >> 2)
1143 == WLAN_HT_CAP_SM_PS_STATIC
)
1146 /* Need both Tx chains/antennas to support MIMO */
1147 if (priv
->hw_params
.tx_chains_num
< 2)
1150 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1152 tbl
->lq_type
= LQ_MIMO2
;
1153 tbl
->is_dup
= lq_sta
->is_dup
;
1155 rate_mask
= lq_sta
->active_mimo2_rate
;
1157 if (priv
->current_ht_config
.supported_chan_width
1158 == IWL_CHANNEL_WIDTH_40MHZ
)
1163 /* FIXME: - don't toggle SGI here
1165 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1169 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1175 rs_set_expected_tpt_table(lq_sta
, tbl
);
1177 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1179 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate
, rate_mask
);
1181 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1182 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1186 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, rate
, is_green
);
1188 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1189 tbl
->current_rate
, is_green
);
1194 * Set up search table for SISO
1196 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1197 struct iwl_lq_sta
*lq_sta
,
1198 struct ieee80211_conf
*conf
,
1199 struct ieee80211_sta
*sta
,
1200 struct iwl_scale_tbl_info
*tbl
, int index
)
1203 u8 is_green
= lq_sta
->is_green
;
1206 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1207 !sta
->ht_info
.ht_supported
)
1210 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1212 tbl
->is_dup
= lq_sta
->is_dup
;
1213 tbl
->lq_type
= LQ_SISO
;
1215 rate_mask
= lq_sta
->active_siso_rate
;
1217 if (priv
->current_ht_config
.supported_chan_width
1218 == IWL_CHANNEL_WIDTH_40MHZ
)
1223 /* FIXME: - don't toggle SGI here
1225 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1229 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1236 tbl
->is_SGI
= 0; /*11n spec: no SGI in SISO+Greenfield*/
1238 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("LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1242 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1243 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1247 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, rate
, is_green
);
1248 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1249 tbl
->current_rate
, is_green
);
1254 * Try to switch to new modulation mode from legacy
1256 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1257 struct iwl_lq_sta
*lq_sta
,
1258 struct ieee80211_conf
*conf
,
1259 struct ieee80211_sta
*sta
,
1262 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1263 struct iwl_scale_tbl_info
*search_tbl
=
1264 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1265 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1266 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1267 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1268 u8 start_action
= tbl
->action
;
1269 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1270 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1274 switch (tbl
->action
) {
1275 case IWL_LEGACY_SWITCH_ANTENNA1
:
1276 case IWL_LEGACY_SWITCH_ANTENNA2
:
1277 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1279 lq_sta
->action_counter
++;
1281 if ((tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA1
&&
1282 tx_chains_num
<= 1) ||
1283 (tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA2
&&
1284 tx_chains_num
<= 2))
1287 /* Don't change antenna if success has been great */
1288 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1291 /* Set up search table to try other antenna */
1292 memcpy(search_tbl
, tbl
, sz
);
1294 if (rs_toggle_antenna(valid_tx_ant
,
1295 &search_tbl
->current_rate
, search_tbl
)) {
1296 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1300 case IWL_LEGACY_SWITCH_SISO
:
1301 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1303 /* Set up search table to try SISO */
1304 memcpy(search_tbl
, tbl
, sz
);
1305 search_tbl
->is_SGI
= 0;
1306 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1309 lq_sta
->action_counter
= 0;
1314 case IWL_LEGACY_SWITCH_MIMO2_AB
:
1315 case IWL_LEGACY_SWITCH_MIMO2_AC
:
1316 case IWL_LEGACY_SWITCH_MIMO2_BC
:
1317 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1319 /* Set up search table to try MIMO */
1320 memcpy(search_tbl
, tbl
, sz
);
1321 search_tbl
->is_SGI
= 0;
1323 if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AB
)
1324 search_tbl
->ant_type
= ANT_AB
;
1325 else if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AC
)
1326 search_tbl
->ant_type
= ANT_AC
;
1328 search_tbl
->ant_type
= ANT_BC
;
1330 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1333 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1336 lq_sta
->action_counter
= 0;
1342 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2_BC
)
1343 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1345 if (tbl
->action
== start_action
)
1349 search_tbl
->lq_type
= LQ_NONE
;
1353 lq_sta
->search_better_tbl
= 1;
1355 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2_BC
)
1356 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1362 * Try to switch to new modulation mode from SISO
1364 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1365 struct iwl_lq_sta
*lq_sta
,
1366 struct ieee80211_conf
*conf
,
1367 struct ieee80211_sta
*sta
, int index
)
1369 u8 is_green
= lq_sta
->is_green
;
1370 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1371 struct iwl_scale_tbl_info
*search_tbl
=
1372 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1373 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1374 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1375 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1376 u8 start_action
= tbl
->action
;
1377 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1378 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1382 lq_sta
->action_counter
++;
1383 switch (tbl
->action
) {
1384 case IWL_SISO_SWITCH_ANTENNA1
:
1385 case IWL_SISO_SWITCH_ANTENNA2
:
1386 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1388 if ((tbl
->action
== IWL_SISO_SWITCH_ANTENNA1
&&
1389 tx_chains_num
<= 1) ||
1390 (tbl
->action
== IWL_SISO_SWITCH_ANTENNA2
&&
1391 tx_chains_num
<= 2))
1394 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1397 memcpy(search_tbl
, tbl
, sz
);
1398 if (rs_toggle_antenna(valid_tx_ant
,
1399 &search_tbl
->current_rate
, search_tbl
))
1402 case IWL_SISO_SWITCH_MIMO2_AB
:
1403 case IWL_SISO_SWITCH_MIMO2_AC
:
1404 case IWL_SISO_SWITCH_MIMO2_BC
:
1405 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1406 memcpy(search_tbl
, tbl
, sz
);
1407 search_tbl
->is_SGI
= 0;
1409 if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AB
)
1410 search_tbl
->ant_type
= ANT_AB
;
1411 else if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AC
)
1412 search_tbl
->ant_type
= ANT_AC
;
1414 search_tbl
->ant_type
= ANT_BC
;
1416 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1419 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1424 case IWL_SISO_SWITCH_GI
:
1426 !(priv
->current_ht_config
.sgf
&
1430 !(priv
->current_ht_config
.sgf
&
1434 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1436 memcpy(search_tbl
, tbl
, sz
);
1441 IWL_ERROR("SGI was set in GF+SISO\n");
1443 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1444 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1446 s32 tpt
= lq_sta
->last_tpt
/ 100;
1447 if (tpt
>= search_tbl
->expected_tpt
[index
])
1450 search_tbl
->current_rate
= rate_n_flags_from_tbl(
1451 search_tbl
, index
, is_green
);
1455 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1456 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1458 if (tbl
->action
== start_action
)
1461 search_tbl
->lq_type
= LQ_NONE
;
1465 lq_sta
->search_better_tbl
= 1;
1467 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1468 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1473 * Try to switch to new modulation mode from MIMO
1475 static int rs_move_mimo_to_other(struct iwl_priv
*priv
,
1476 struct iwl_lq_sta
*lq_sta
,
1477 struct ieee80211_conf
*conf
,
1478 struct ieee80211_sta
*sta
, int index
)
1480 s8 is_green
= lq_sta
->is_green
;
1481 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1482 struct iwl_scale_tbl_info
*search_tbl
=
1483 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1484 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1485 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1486 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1487 u8 start_action
= tbl
->action
;
1488 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1489 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1493 lq_sta
->action_counter
++;
1494 switch (tbl
->action
) {
1495 case IWL_MIMO2_SWITCH_ANTENNA1
:
1496 case IWL_MIMO2_SWITCH_ANTENNA2
:
1497 IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1499 if (tx_chains_num
<= 2)
1502 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1505 memcpy(search_tbl
, tbl
, sz
);
1506 if (rs_toggle_antenna(valid_tx_ant
,
1507 &search_tbl
->current_rate
, search_tbl
))
1510 case IWL_MIMO2_SWITCH_SISO_A
:
1511 case IWL_MIMO2_SWITCH_SISO_B
:
1512 case IWL_MIMO2_SWITCH_SISO_C
:
1513 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1515 /* Set up new search table for SISO */
1516 memcpy(search_tbl
, tbl
, sz
);
1518 if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_A
)
1519 search_tbl
->ant_type
= ANT_A
;
1520 else if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_B
)
1521 search_tbl
->ant_type
= ANT_B
;
1523 search_tbl
->ant_type
= ANT_C
;
1525 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1528 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1535 case IWL_MIMO2_SWITCH_GI
:
1537 !(priv
->current_ht_config
.sgf
&
1541 !(priv
->current_ht_config
.sgf
&
1545 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1547 /* Set up new search table for MIMO */
1548 memcpy(search_tbl
, tbl
, sz
);
1549 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1550 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1552 * If active table already uses the fastest possible
1553 * modulation (dual stream with short guard interval),
1554 * and it's working well, there's no need to look
1555 * for a better type of modulation!
1558 s32 tpt
= lq_sta
->last_tpt
/ 100;
1559 if (tpt
>= search_tbl
->expected_tpt
[index
])
1562 search_tbl
->current_rate
= rate_n_flags_from_tbl(
1563 search_tbl
, index
, is_green
);
1568 if (tbl
->action
> IWL_MIMO2_SWITCH_GI
)
1569 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1571 if (tbl
->action
== start_action
)
1574 search_tbl
->lq_type
= LQ_NONE
;
1577 lq_sta
->search_better_tbl
= 1;
1579 if (tbl
->action
> IWL_MIMO2_SWITCH_GI
)
1580 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1586 * Check whether we should continue using same modulation mode, or
1587 * begin search for a new mode, based on:
1588 * 1) # tx successes or failures while using this mode
1589 * 2) # times calling this function
1590 * 3) elapsed time in this mode (not used, for now)
1592 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
)
1594 struct iwl_scale_tbl_info
*tbl
;
1597 int flush_interval_passed
= 0;
1598 struct iwl_priv
*priv
;
1601 active_tbl
= lq_sta
->active_tbl
;
1603 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1605 /* If we've been disallowing search, see if we should now allow it */
1606 if (lq_sta
->stay_in_tbl
) {
1608 /* Elapsed time using current modulation mode */
1609 if (lq_sta
->flush_timer
)
1610 flush_interval_passed
=
1612 (unsigned long)(lq_sta
->flush_timer
+
1613 IWL_RATE_SCALE_FLUSH_INTVL
));
1616 * Check if we should allow search for new modulation mode.
1617 * If many frames have failed or succeeded, or we've used
1618 * this same modulation for a long time, allow search, and
1619 * reset history stats that keep track of whether we should
1620 * allow a new search. Also (below) reset all bitmaps and
1621 * stats in active history.
1623 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1624 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1625 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1626 && (flush_interval_passed
))) {
1627 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1628 lq_sta
->total_failed
,
1629 lq_sta
->total_success
,
1630 flush_interval_passed
);
1632 /* Allow search for new mode */
1633 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1634 lq_sta
->total_failed
= 0;
1635 lq_sta
->total_success
= 0;
1636 lq_sta
->flush_timer
= 0;
1639 * Else if we've used this modulation mode enough repetitions
1640 * (regardless of elapsed time or success/failure), reset
1641 * history bitmaps and rate-specific stats for all rates in
1645 lq_sta
->table_count
++;
1646 if (lq_sta
->table_count
>=
1647 lq_sta
->table_count_limit
) {
1648 lq_sta
->table_count
= 0;
1650 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1651 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1652 rs_rate_scale_clear_window(
1657 /* If transitioning to allow "search", reset all history
1658 * bitmaps and stats in active table (this will become the new
1659 * "search" table). */
1660 if (!lq_sta
->stay_in_tbl
) {
1661 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1662 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1668 * Do rate scaling and search for new modulation mode.
1670 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
1671 struct ieee80211_hdr
*hdr
,
1672 struct ieee80211_sta
*sta
,
1673 struct iwl_lq_sta
*lq_sta
)
1675 struct ieee80211_hw
*hw
= priv
->hw
;
1676 struct ieee80211_conf
*conf
= &hw
->conf
;
1677 int low
= IWL_RATE_INVALID
;
1678 int high
= IWL_RATE_INVALID
;
1681 struct iwl_rate_scale_data
*window
= NULL
;
1682 int current_tpt
= IWL_INVALID_VALUE
;
1683 int low_tpt
= IWL_INVALID_VALUE
;
1684 int high_tpt
= IWL_INVALID_VALUE
;
1686 s8 scale_action
= 0;
1690 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
1691 u16 rate_scale_index_msk
= 0;
1698 u8 tid
= MAX_TID_COUNT
;
1700 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1702 fc
= hdr
->frame_control
;
1703 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
)) {
1704 /* Send management frames and broadcast/multicast data using
1706 /* TODO: this could probably be improved.. */
1710 if (!sta
|| !lq_sta
)
1713 lq_sta
->supp_rates
= sta
->supp_rates
[lq_sta
->band
];
1715 tid
= rs_tl_add_packet(lq_sta
, hdr
);
1718 * Select rate-scale / modulation-mode table to work with in
1719 * the rest of this function: "search" if searching for better
1720 * modulation mode, or "active" if doing rate scaling within a mode.
1722 if (!lq_sta
->search_better_tbl
)
1723 active_tbl
= lq_sta
->active_tbl
;
1725 active_tbl
= 1 - lq_sta
->active_tbl
;
1727 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1728 is_green
= lq_sta
->is_green
;
1730 /* current tx rate */
1731 index
= lq_sta
->last_txrate_idx
;
1733 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index
,
1736 /* rates available for this association, and for modulation mode */
1737 rate_mask
= rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
);
1739 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask
);
1741 /* mask with station rate restriction */
1742 if (is_legacy(tbl
->lq_type
)) {
1743 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1744 /* supp_rates has no CCK bits in A mode */
1745 rate_scale_index_msk
= (u16
) (rate_mask
&
1746 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
1748 rate_scale_index_msk
= (u16
) (rate_mask
&
1749 lq_sta
->supp_rates
);
1752 rate_scale_index_msk
= rate_mask
;
1754 if (!rate_scale_index_msk
)
1755 rate_scale_index_msk
= rate_mask
;
1757 if (!((1 << index
) & rate_scale_index_msk
)) {
1758 IWL_ERROR("Current Rate is not valid\n");
1762 /* Get expected throughput table and history window for current rate */
1763 if (!tbl
->expected_tpt
) {
1764 IWL_ERROR("tbl->expected_tpt is NULL\n");
1768 window
= &(tbl
->win
[index
]);
1771 * If there is not enough history to calculate actual average
1772 * throughput, keep analyzing results of more tx frames, without
1773 * changing rate or mode (bypass most of the rest of this function).
1774 * Set up new rate table in uCode only if old rate is not supported
1775 * in current association (use new rate found above).
1777 fail_count
= window
->counter
- window
->success_counter
;
1778 if ((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
1779 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
)) {
1780 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1782 window
->success_counter
, window
->counter
, index
);
1784 /* Can't calculate this yet; not enough history */
1785 window
->average_tpt
= IWL_INVALID_VALUE
;
1787 /* Should we stay with this modulation mode,
1788 * or search for a new one? */
1789 rs_stay_in_table(lq_sta
);
1794 /* Else we have enough samples; calculate estimate of
1795 * actual average throughput */
1797 BUG_ON(window
->average_tpt
!= ((window
->success_ratio
*
1798 tbl
->expected_tpt
[index
] + 64) / 128));
1800 /* If we are searching for better modulation mode, check success. */
1801 if (lq_sta
->search_better_tbl
) {
1803 /* If good success, continue using the "search" mode;
1804 * no need to send new link quality command, since we're
1805 * continuing to use the setup that we've been trying. */
1806 if (window
->average_tpt
> lq_sta
->last_tpt
) {
1808 IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1809 "suc=%d cur-tpt=%d old-tpt=%d\n",
1810 window
->success_ratio
,
1811 window
->average_tpt
,
1814 if (!is_legacy(tbl
->lq_type
))
1815 lq_sta
->enable_counter
= 1;
1817 /* Swap tables; "search" becomes "active" */
1818 lq_sta
->active_tbl
= active_tbl
;
1819 current_tpt
= window
->average_tpt
;
1821 /* Else poor success; go back to mode in "active" table */
1824 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1825 "suc=%d cur-tpt=%d old-tpt=%d\n",
1826 window
->success_ratio
,
1827 window
->average_tpt
,
1830 /* Nullify "search" table */
1831 tbl
->lq_type
= LQ_NONE
;
1833 /* Revert to "active" table */
1834 active_tbl
= lq_sta
->active_tbl
;
1835 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1837 /* Revert to "active" rate and throughput info */
1838 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
1839 current_tpt
= lq_sta
->last_tpt
;
1841 /* Need to set up a new rate table in uCode */
1845 /* Either way, we've made a decision; modulation mode
1846 * search is done, allow rate adjustment next time. */
1847 lq_sta
->search_better_tbl
= 0;
1848 done_search
= 1; /* Don't switch modes below! */
1852 /* (Else) not in search of better modulation mode, try for better
1853 * starting rate, while staying in this mode. */
1854 high_low
= rs_get_adjacent_rate(priv
, index
, rate_scale_index_msk
,
1856 low
= high_low
& 0xff;
1857 high
= (high_low
>> 8) & 0xff;
1859 sr
= window
->success_ratio
;
1861 /* Collect measured throughputs for current and adjacent rates */
1862 current_tpt
= window
->average_tpt
;
1863 if (low
!= IWL_RATE_INVALID
)
1864 low_tpt
= tbl
->win
[low
].average_tpt
;
1865 if (high
!= IWL_RATE_INVALID
)
1866 high_tpt
= tbl
->win
[high
].average_tpt
;
1870 /* Too many failures, decrease rate */
1871 if ((sr
<= IWL_RATE_DECREASE_TH
) || (current_tpt
== 0)) {
1872 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1875 /* No throughput measured yet for adjacent rates; try increase. */
1876 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
1877 (high_tpt
== IWL_INVALID_VALUE
)) {
1879 if (high
!= IWL_RATE_INVALID
&& sr
>= IWL_RATE_INCREASE_TH
)
1881 else if (low
!= IWL_RATE_INVALID
)
1885 /* Both adjacent throughputs are measured, but neither one has better
1886 * throughput; we're using the best rate, don't change it! */
1887 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1888 (high_tpt
!= IWL_INVALID_VALUE
) &&
1889 (low_tpt
< current_tpt
) &&
1890 (high_tpt
< current_tpt
))
1893 /* At least one adjacent rate's throughput is measured,
1894 * and may have better performance. */
1896 /* Higher adjacent rate's throughput is measured */
1897 if (high_tpt
!= IWL_INVALID_VALUE
) {
1898 /* Higher rate has better throughput */
1899 if (high_tpt
> current_tpt
&&
1900 sr
>= IWL_RATE_INCREASE_TH
) {
1904 ("decrease rate because of high tpt\n");
1908 /* Lower adjacent rate's throughput is measured */
1909 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
1910 /* Lower rate has better throughput */
1911 if (low_tpt
> current_tpt
) {
1913 ("decrease rate because of low tpt\n");
1915 } else if (sr
>= IWL_RATE_INCREASE_TH
) {
1921 /* Sanity check; asked for decrease, but success rate or throughput
1922 * has been good at old rate. Don't change it. */
1923 if ((scale_action
== -1) && (low
!= IWL_RATE_INVALID
) &&
1924 ((sr
> IWL_RATE_HIGH_TH
) ||
1925 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
1928 switch (scale_action
) {
1930 /* Decrease starting rate, update uCode's rate table */
1931 if (low
!= IWL_RATE_INVALID
) {
1937 /* Increase starting rate, update uCode's rate table */
1938 if (high
!= IWL_RATE_INVALID
) {
1950 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1951 "high %d type %d\n",
1952 index
, scale_action
, low
, high
, tbl
->lq_type
);
1955 /* Replace uCode's rate table for the destination station. */
1957 rate
= rate_n_flags_from_tbl(tbl
, index
, is_green
);
1958 rs_fill_link_cmd(priv
, lq_sta
, rate
);
1959 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1962 /* Should we stay with this modulation mode, or search for a new one? */
1963 rs_stay_in_table(lq_sta
);
1966 * Search for new modulation mode if we're:
1967 * 1) Not changing rates right now
1968 * 2) Not just finishing up a search
1969 * 3) Allowing a new search
1971 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
&& window
->counter
) {
1972 /* Save current throughput to compare with "search" throughput*/
1973 lq_sta
->last_tpt
= current_tpt
;
1975 /* Select a new "search" modulation mode to try.
1976 * If one is found, set up the new "search" table. */
1977 if (is_legacy(tbl
->lq_type
))
1978 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
1979 else if (is_siso(tbl
->lq_type
))
1980 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
1982 rs_move_mimo_to_other(priv
, lq_sta
, conf
, sta
, index
);
1984 /* If new "search" mode was selected, set up in uCode table */
1985 if (lq_sta
->search_better_tbl
) {
1986 /* Access the "search" table, clear its history. */
1987 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1988 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1989 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1991 /* Use new "search" start rate */
1992 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
1994 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1995 tbl
->current_rate
, index
);
1996 rs_fill_link_cmd(priv
, lq_sta
, tbl
->current_rate
);
1997 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2000 /* If the "active" (non-search) mode was legacy,
2001 * and we've tried switching antennas,
2002 * but we haven't been able to try HT modes (not available),
2003 * stay with best antenna legacy modulation for a while
2004 * before next round of mode comparisons. */
2005 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2006 if (is_legacy(tbl1
->lq_type
) &&
2007 (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
)) &&
2008 (lq_sta
->action_counter
>= 1)) {
2009 lq_sta
->action_counter
= 0;
2010 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2011 rs_set_stay_in_table(priv
, 1, lq_sta
);
2014 /* If we're in an HT mode, and all 3 mode switch actions
2015 * have been tried and compared, stay in this best modulation
2016 * mode for a while before next round of mode comparisons. */
2017 if (lq_sta
->enable_counter
&&
2018 (lq_sta
->action_counter
>= IWL_ACTION_LIMIT
)) {
2019 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2020 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2021 (tid
!= MAX_TID_COUNT
)) {
2022 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid
);
2023 rs_tl_turn_on_agg(priv
, tid
, lq_sta
, sta
);
2025 lq_sta
->action_counter
= 0;
2026 rs_set_stay_in_table(priv
, 0, lq_sta
);
2030 * Else, don't search for a new modulation mode.
2031 * Put new timestamp in stay-in-modulation-mode flush timer if:
2032 * 1) Not changing rates right now
2033 * 2) Not just finishing up a search
2034 * 3) flush timer is empty
2037 if ((!update_lq
) && (!done_search
) && (!lq_sta
->flush_timer
))
2038 lq_sta
->flush_timer
= jiffies
;
2042 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, index
, is_green
);
2044 lq_sta
->last_txrate_idx
= i
;
2050 static void rs_initialize_lq(struct iwl_priv
*priv
,
2051 struct ieee80211_conf
*conf
,
2052 struct ieee80211_sta
*sta
,
2053 struct iwl_lq_sta
*lq_sta
)
2055 struct iwl_scale_tbl_info
*tbl
;
2059 u8 use_green
= rs_use_green(priv
, conf
);
2063 if (!sta
|| !lq_sta
)
2066 i
= lq_sta
->last_txrate_idx
;
2068 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2069 (priv
->iw_mode
== NL80211_IFTYPE_ADHOC
))
2072 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2074 if (!lq_sta
->search_better_tbl
)
2075 active_tbl
= lq_sta
->active_tbl
;
2077 active_tbl
= 1 - lq_sta
->active_tbl
;
2079 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2081 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2084 /* FIXME:RS: This is also wrong in 4965 */
2085 rate
= iwl_rates
[i
].plcp
;
2086 rate
|= RATE_MCS_ANT_B_MSK
;
2087 rate
&= ~RATE_MCS_ANT_A_MSK
;
2089 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2090 rate
|= RATE_MCS_CCK_MSK
;
2092 tbl
->ant_type
= ANT_B
;
2093 rs_get_tbl_info_from_mcs(rate
, priv
->band
, tbl
, &rate_idx
);
2094 if (!rs_is_valid_ant(valid_tx_ant
, tbl
->ant_type
))
2095 rs_toggle_antenna(valid_tx_ant
, &rate
, tbl
);
2097 rate
= rate_n_flags_from_tbl(tbl
, rate_idx
, use_green
);
2098 tbl
->current_rate
= rate
;
2099 rs_set_expected_tpt_table(lq_sta
, tbl
);
2100 rs_fill_link_cmd(NULL
, lq_sta
, rate
);
2101 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2106 static void rs_get_rate(void *priv_r
, struct ieee80211_supported_band
*sband
,
2107 struct ieee80211_sta
*sta
, void *priv_sta
,
2108 struct sk_buff
*skb
, struct rate_selection
*sel
)
2112 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2113 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2114 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2116 struct iwl_lq_sta
*lq_sta
;
2118 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2120 /* Send management frames and broadcast/multicast data using lowest
2122 fc
= hdr
->frame_control
;
2123 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
) ||
2124 !sta
|| !priv_sta
) {
2125 sel
->rate_idx
= rate_lowest_index(sband
, sta
);
2129 lq_sta
= (struct iwl_lq_sta
*)priv_sta
;
2130 i
= lq_sta
->last_txrate_idx
;
2132 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
2133 !lq_sta
->ibss_sta_added
) {
2134 u8 sta_id
= iwl_find_station(priv
, hdr
->addr1
);
2135 DECLARE_MAC_BUF(mac
);
2137 if (sta_id
== IWL_INVALID_STATION
) {
2138 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2139 print_mac(mac
, hdr
->addr1
));
2140 sta_id
= iwl_add_station_flags(priv
, hdr
->addr1
,
2141 0, CMD_ASYNC
, NULL
);
2143 if ((sta_id
!= IWL_INVALID_STATION
)) {
2144 lq_sta
->lq
.sta_id
= sta_id
;
2145 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2146 lq_sta
->ibss_sta_added
= 1;
2147 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2151 if ((i
< 0) || (i
> IWL_RATE_COUNT
)) {
2152 sel
->rate_idx
= rate_lowest_index(sband
, sta
);
2156 if (sband
->band
== IEEE80211_BAND_5GHZ
)
2157 i
-= IWL_FIRST_OFDM_RATE
;
2161 static void *rs_alloc_sta(void *priv_rate
, struct ieee80211_sta
*sta
,
2164 struct iwl_lq_sta
*lq_sta
;
2165 struct iwl_priv
*priv
;
2168 priv
= (struct iwl_priv
*)priv_rate
;
2169 IWL_DEBUG_RATE("create station rate scale window\n");
2171 lq_sta
= kzalloc(sizeof(struct iwl_lq_sta
), gfp
);
2175 lq_sta
->lq
.sta_id
= 0xff;
2178 for (j
= 0; j
< LQ_SIZE
; j
++)
2179 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2180 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2185 static void rs_rate_init(void *priv_r
, struct ieee80211_supported_band
*sband
,
2186 struct ieee80211_sta
*sta
, void *priv_sta
)
2189 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2190 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2191 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2193 lq_sta
->flush_timer
= 0;
2194 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2195 for (j
= 0; j
< LQ_SIZE
; j
++)
2196 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2197 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2199 IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2200 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2201 * the lowest or the highest rate.. Could consider using RSSI from
2202 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2205 lq_sta
->ibss_sta_added
= 0;
2206 if (priv
->iw_mode
== NL80211_IFTYPE_AP
) {
2207 u8 sta_id
= iwl_find_station(priv
, sta
->addr
);
2208 DECLARE_MAC_BUF(mac
);
2210 /* for IBSS the call are from tasklet */
2211 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2212 print_mac(mac
, sta
->addr
));
2214 if (sta_id
== IWL_INVALID_STATION
) {
2215 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2216 print_mac(mac
, sta
->addr
));
2217 sta_id
= iwl_add_station_flags(priv
, sta
->addr
,
2218 0, CMD_ASYNC
, NULL
);
2220 if ((sta_id
!= IWL_INVALID_STATION
)) {
2221 lq_sta
->lq
.sta_id
= sta_id
;
2222 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2224 /* FIXME: this is w/a remove it later */
2225 priv
->assoc_station_added
= 1;
2228 /* Find highest tx rate supported by hardware and destination station */
2229 lq_sta
->last_txrate_idx
= 3;
2230 for (i
= 0; i
< sband
->n_bitrates
; i
++)
2231 if (sta
->supp_rates
[sband
->band
] & BIT(i
))
2232 lq_sta
->last_txrate_idx
= i
;
2234 /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2235 if (sband
->band
== IEEE80211_BAND_5GHZ
)
2236 lq_sta
->last_txrate_idx
+= IWL_FIRST_OFDM_RATE
;
2239 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2240 lq_sta
->active_legacy_rate
= priv
->active_rate
& ~(0x1000);
2241 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2242 lq_sta
->band
= priv
->band
;
2244 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2245 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2247 lq_sta
->active_siso_rate
= conf
->ht_conf
.supp_mcs_set
[0] << 1;
2248 lq_sta
->active_siso_rate
|= conf
->ht_conf
.supp_mcs_set
[0] & 0x1;
2249 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2250 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2253 lq_sta
->active_mimo2_rate
= conf
->ht_conf
.supp_mcs_set
[1] << 1;
2254 lq_sta
->active_mimo2_rate
|= conf
->ht_conf
.supp_mcs_set
[1] & 0x1;
2255 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2256 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2258 lq_sta
->active_mimo3_rate
= conf
->ht_conf
.supp_mcs_set
[2] << 1;
2259 lq_sta
->active_mimo3_rate
|= conf
->ht_conf
.supp_mcs_set
[2] & 0x1;
2260 lq_sta
->active_mimo3_rate
&= ~((u16
)0x2);
2261 lq_sta
->active_mimo3_rate
<<= IWL_FIRST_OFDM_RATE
;
2263 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2264 lq_sta
->active_siso_rate
,
2265 lq_sta
->active_mimo2_rate
,
2266 lq_sta
->active_mimo3_rate
);
2268 /* These values will be overriden later */
2269 lq_sta
->lq
.general_params
.single_stream_ant_msk
= ANT_A
;
2270 lq_sta
->lq
.general_params
.dual_stream_ant_msk
= ANT_AB
;
2272 /* as default allow aggregation for all tids */
2273 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2276 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2279 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
2280 struct iwl_lq_sta
*lq_sta
, u32 new_rate
)
2282 struct iwl_scale_tbl_info tbl_type
;
2285 int repeat_rate
= 0;
2286 u8 ant_toggle_cnt
= 0;
2287 u8 use_ht_possible
= 1;
2288 u8 valid_tx_ant
= 0;
2289 struct iwl_link_quality_cmd
*lq_cmd
= &lq_sta
->lq
;
2291 /* Override starting rate (index 0) if needed for debug purposes */
2292 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2294 /* Interpret new_rate (rate_n_flags) */
2295 memset(&tbl_type
, 0, sizeof(tbl_type
));
2296 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
,
2297 &tbl_type
, &rate_idx
);
2299 /* How many times should we repeat the initial rate? */
2300 if (is_legacy(tbl_type
.lq_type
)) {
2302 repeat_rate
= IWL_NUMBER_TRY
;
2304 repeat_rate
= IWL_HT_NUMBER_TRY
;
2307 lq_cmd
->general_params
.mimo_delimiter
=
2308 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2310 /* Fill 1st table entry (index 0) */
2311 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2313 if (num_of_ant(tbl_type
.ant_type
) == 1) {
2314 lq_cmd
->general_params
.single_stream_ant_msk
=
2316 } else if (num_of_ant(tbl_type
.ant_type
) == 2) {
2317 lq_cmd
->general_params
.dual_stream_ant_msk
=
2319 } /* otherwise we don't modify the existing value */
2325 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2327 /* Fill rest of rate table */
2328 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2329 /* Repeat initial/next rate.
2330 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2331 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2332 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2333 if (is_legacy(tbl_type
.lq_type
)) {
2334 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2337 rs_toggle_antenna(valid_tx_ant
,
2338 &new_rate
, &tbl_type
))
2342 /* Override next rate if needed for debug purposes */
2343 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2345 /* Fill next table entry */
2346 lq_cmd
->rs_table
[index
].rate_n_flags
=
2347 cpu_to_le32(new_rate
);
2352 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
, &tbl_type
,
2355 /* Indicate to uCode which entries might be MIMO.
2356 * If initial rate was MIMO, this will finally end up
2357 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2358 if (is_mimo(tbl_type
.lq_type
))
2359 lq_cmd
->general_params
.mimo_delimiter
= index
;
2362 new_rate
= rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2365 /* How many times should we repeat the next rate? */
2366 if (is_legacy(tbl_type
.lq_type
)) {
2367 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2370 rs_toggle_antenna(valid_tx_ant
,
2371 &new_rate
, &tbl_type
))
2374 repeat_rate
= IWL_NUMBER_TRY
;
2376 repeat_rate
= IWL_HT_NUMBER_TRY
;
2379 /* Don't allow HT rates after next pass.
2380 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2381 use_ht_possible
= 0;
2383 /* Override next rate if needed for debug purposes */
2384 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2386 /* Fill next table entry */
2387 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2393 lq_cmd
->agg_params
.agg_frame_cnt_limit
= 64;
2394 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2395 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2398 static void *rs_alloc(struct ieee80211_hw
*hw
, struct dentry
*debugfsdir
)
2402 /* rate scale requires free function to be implemented */
2403 static void rs_free(void *priv_rate
)
2408 static void rs_clear(void *priv_rate
)
2410 #ifdef CONFIG_IWLWIFI_DEBUG
2411 struct iwl_priv
*priv
= (struct iwl_priv
*) priv_rate
;
2413 IWL_DEBUG_RATE("enter\n");
2415 /* TODO - add rate scale state reset */
2417 IWL_DEBUG_RATE("leave\n");
2418 #endif /* CONFIG_IWLWIFI_DEBUG */
2421 static void rs_free_sta(void *priv_r
, struct ieee80211_sta
*sta
,
2424 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2425 struct iwl_priv
*priv __maybe_unused
= priv_r
;
2427 IWL_DEBUG_RATE("enter\n");
2429 IWL_DEBUG_RATE("leave\n");
2433 #ifdef CONFIG_MAC80211_DEBUGFS
2434 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2436 file
->private_data
= inode
->i_private
;
2439 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
2440 u32
*rate_n_flags
, int index
)
2442 struct iwl_priv
*priv
;
2445 if (lq_sta
->dbg_fixed_rate
) {
2447 *rate_n_flags
= lq_sta
->dbg_fixed_rate
;
2449 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2450 *rate_n_flags
= 0x800D;
2452 *rate_n_flags
= 0x820A;
2454 IWL_DEBUG_RATE("Fixed rate ON\n");
2456 IWL_DEBUG_RATE("Fixed rate OFF\n");
2460 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2461 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2463 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2464 struct iwl_priv
*priv
;
2470 memset(buf
, 0, sizeof(buf
));
2471 buf_size
= min(count
, sizeof(buf
) - 1);
2472 if (copy_from_user(buf
, user_buf
, buf_size
))
2475 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2476 lq_sta
->dbg_fixed_rate
= parsed_rate
;
2478 lq_sta
->dbg_fixed_rate
= 0;
2480 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2481 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2482 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2483 lq_sta
->active_mimo3_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2485 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2486 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed_rate
);
2488 if (lq_sta
->dbg_fixed_rate
) {
2489 rs_fill_link_cmd(NULL
, lq_sta
, lq_sta
->dbg_fixed_rate
);
2490 iwl_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2496 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2497 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2503 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2505 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2506 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2507 lq_sta
->total_failed
, lq_sta
->total_success
,
2508 lq_sta
->active_legacy_rate
);
2509 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2510 lq_sta
->dbg_fixed_rate
);
2511 desc
+= sprintf(buff
+desc
, "general:"
2512 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2513 lq_sta
->lq
.general_params
.flags
,
2514 lq_sta
->lq
.general_params
.mimo_delimiter
,
2515 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2516 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2518 desc
+= sprintf(buff
+desc
, "agg:"
2519 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2520 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2521 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2522 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2524 desc
+= sprintf(buff
+desc
,
2525 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2526 lq_sta
->lq
.general_params
.start_rate_index
[0],
2527 lq_sta
->lq
.general_params
.start_rate_index
[1],
2528 lq_sta
->lq
.general_params
.start_rate_index
[2],
2529 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2532 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
2533 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X\n",
2534 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2536 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2539 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2540 .write
= rs_sta_dbgfs_scale_table_write
,
2541 .read
= rs_sta_dbgfs_scale_table_read
,
2542 .open
= open_file_generic
,
2544 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2545 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2551 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2552 for (i
= 0; i
< LQ_SIZE
; i
++) {
2553 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2555 lq_sta
->active_tbl
== i
?"*":"x",
2556 lq_sta
->lq_info
[i
].lq_type
,
2557 lq_sta
->lq_info
[i
].is_SGI
,
2558 lq_sta
->lq_info
[i
].is_fat
,
2559 lq_sta
->lq_info
[i
].is_dup
,
2560 lq_sta
->lq_info
[i
].current_rate
);
2561 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2562 desc
+= sprintf(buff
+desc
,
2563 "counter=%d success=%d %%=%d\n",
2564 lq_sta
->lq_info
[i
].win
[j
].counter
,
2565 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2566 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2569 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2572 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2573 .read
= rs_sta_dbgfs_stats_table_read
,
2574 .open
= open_file_generic
,
2577 static void rs_add_debugfs(void *priv
, void *priv_sta
,
2580 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2581 lq_sta
->rs_sta_dbgfs_scale_table_file
=
2582 debugfs_create_file("rate_scale_table", 0600, dir
,
2583 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
2584 lq_sta
->rs_sta_dbgfs_stats_table_file
=
2585 debugfs_create_file("rate_stats_table", 0600, dir
,
2586 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
2587 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
2588 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
2589 &lq_sta
->tx_agg_tid_en
);
2593 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
2595 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2596 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
2597 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
2598 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
2602 static struct rate_control_ops rs_ops
= {
2605 .tx_status
= rs_tx_status
,
2606 .get_rate
= rs_get_rate
,
2607 .rate_init
= rs_rate_init
,
2611 .alloc_sta
= rs_alloc_sta
,
2612 .free_sta
= rs_free_sta
,
2613 #ifdef CONFIG_MAC80211_DEBUGFS
2614 .add_sta_debugfs
= rs_add_debugfs
,
2615 .remove_sta_debugfs
= rs_remove_debugfs
,
2619 int iwlagn_rate_control_register(void)
2621 return ieee80211_rate_control_register(&rs_ops
);
2624 void iwlagn_rate_control_unregister(void)
2626 ieee80211_rate_control_unregister(&rs_ops
);