1 /******************************************************************************
3 * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
36 #include <linux/workqueue.h>
42 #define RS_NAME "iwl-agn-rs"
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY 1
46 #define IWL_HT_NUMBER_TRY 3
48 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52 /* max allowed rate miss before sync LQ cmd */
53 #define IWL_MISSED_RATE_MAX 15
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
57 static u8 rs_ht_to_legacy
[] = {
58 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
59 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
61 IWL_RATE_6M_INDEX
, IWL_RATE_9M_INDEX
,
62 IWL_RATE_12M_INDEX
, IWL_RATE_18M_INDEX
,
63 IWL_RATE_24M_INDEX
, IWL_RATE_36M_INDEX
,
64 IWL_RATE_48M_INDEX
, IWL_RATE_54M_INDEX
67 static const u8 ant_toggle_lookup
[] = {
68 /*ANT_NONE -> */ ANT_NONE
,
71 /*ANT_AB -> */ ANT_BC
,
73 /*ANT_AC -> */ ANT_AB
,
74 /*ANT_BC -> */ ANT_AC
,
75 /*ANT_ABC -> */ ANT_ABC
,
79 * struct iwl_rate_scale_data -- tx success history for one rate
81 struct iwl_rate_scale_data
{
82 u64 data
; /* bitmap of successful frames */
83 s32 success_counter
; /* number of frames successful */
84 s32 success_ratio
; /* per-cent * 128 */
85 s32 counter
; /* number of frames attempted */
86 s32 average_tpt
; /* success ratio * expected throughput */
91 * struct iwl_scale_tbl_info -- tx params and success history for all rates
93 * There are two of these in struct iwl_lq_sta,
94 * one for "active", and one for "search".
96 struct iwl_scale_tbl_info
{
97 enum iwl_table_type lq_type
;
99 u8 is_SGI
; /* 1 = short guard interval */
100 u8 is_fat
; /* 1 = 40 MHz channel width */
101 u8 is_dup
; /* 1 = duplicated data streams */
102 u8 action
; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
103 s32
*expected_tpt
; /* throughput metrics; expected_tpt_G, etc. */
104 u32 current_rate
; /* rate_n_flags, uCode API format */
105 struct iwl_rate_scale_data win
[IWL_RATE_COUNT
]; /* rate histories */
108 struct iwl_traffic_load
{
109 unsigned long time_stamp
; /* age of the oldest statistics */
110 u32 packet_count
[TID_QUEUE_MAX_SIZE
]; /* packet count in this time
112 u32 total
; /* total num of packets during the
113 * last TID_MAX_TIME_DIFF */
114 u8 queue_count
; /* number of queues that has
115 * been used since the last cleanup */
116 u8 head
; /* start of the circular buffer */
120 * struct iwl_lq_sta -- driver's rate scaling private structure
122 * Pointer to this gets passed back and forth between driver and mac80211.
125 u8 active_tbl
; /* index of active table, range 0-1 */
126 u8 enable_counter
; /* indicates HT mode */
127 u8 stay_in_tbl
; /* 1: disallow, 0: allow search for new mode */
128 u8 search_better_tbl
; /* 1: currently trying alternate mode */
131 /* The following determine when to search for a new mode */
132 u32 table_count_limit
;
133 u32 max_failure_limit
; /* # failed frames before new search */
134 u32 max_success_limit
; /* # successful frames before new search */
136 u32 total_failed
; /* total failed frames, any/all rates */
137 u32 total_success
; /* total successful frames, any/all rates */
138 u32 flush_timer
; /* time staying in mode before new search */
140 u8 action_counter
; /* # mode-switch actions tried */
143 enum ieee80211_band band
;
146 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
148 u16 active_legacy_rate
;
149 u16 active_siso_rate
;
150 u16 active_mimo2_rate
;
151 u16 active_mimo3_rate
;
152 u16 active_rate_basic
;
153 s8 max_rate_idx
; /* Max rate set by user */
154 u8 missed_rate_counter
;
156 struct iwl_link_quality_cmd lq
;
157 struct iwl_scale_tbl_info lq_info
[LQ_SIZE
]; /* "active", "search" */
158 struct iwl_traffic_load load
[TID_MAX_LOAD_COUNT
];
160 #ifdef CONFIG_MAC80211_DEBUGFS
161 struct dentry
*rs_sta_dbgfs_scale_table_file
;
162 struct dentry
*rs_sta_dbgfs_stats_table_file
;
163 struct dentry
*rs_sta_dbgfs_tx_agg_tid_en_file
;
166 struct iwl_priv
*drv
;
168 /* used to be in sta_info */
172 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
173 struct ieee80211_hdr
*hdr
,
174 struct ieee80211_sta
*sta
,
175 struct iwl_lq_sta
*lq_sta
);
176 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
177 struct iwl_lq_sta
*lq_sta
, u32 rate_n_flags
);
180 #ifdef CONFIG_MAC80211_DEBUGFS
181 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
182 u32
*rate_n_flags
, int index
);
184 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
185 u32
*rate_n_flags
, int index
)
190 * Expected throughput metrics for following rates:
191 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
192 * "G" is the only table that supports CCK (the first 4 rates).
194 /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
195 static s32 expected_tpt_A
[IWL_RATE_COUNT
] = {
196 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
199 static s32 expected_tpt_G
[IWL_RATE_COUNT
] = {
200 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
203 static s32 expected_tpt_siso20MHz
[IWL_RATE_COUNT
] = {
204 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
207 static s32 expected_tpt_siso20MHzSGI
[IWL_RATE_COUNT
] = {
208 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
211 static s32 expected_tpt_mimo20MHz
[IWL_RATE_COUNT
] = {
212 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
215 static s32 expected_tpt_mimo20MHzSGI
[IWL_RATE_COUNT
] = {
216 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
219 static s32 expected_tpt_siso40MHz
[IWL_RATE_COUNT
] = {
220 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
223 static s32 expected_tpt_siso40MHzSGI
[IWL_RATE_COUNT
] = {
224 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
227 static s32 expected_tpt_mimo40MHz
[IWL_RATE_COUNT
] = {
228 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
231 static s32 expected_tpt_mimo40MHzSGI
[IWL_RATE_COUNT
] = {
232 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
235 static inline u8
rs_extract_rate(u32 rate_n_flags
)
237 return (u8
)(rate_n_flags
& 0xFF);
240 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data
*window
)
243 window
->success_counter
= 0;
244 window
->success_ratio
= IWL_INVALID_VALUE
;
246 window
->average_tpt
= IWL_INVALID_VALUE
;
250 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
252 return (ant_type
& valid_antenna
) == ant_type
;
256 * removes the old data from the statistics. All data that is older than
257 * TID_MAX_TIME_DIFF, will be deleted.
259 static void rs_tl_rm_old_stats(struct iwl_traffic_load
*tl
, u32 curr_time
)
261 /* The oldest age we want to keep */
262 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
264 while (tl
->queue_count
&&
265 (tl
->time_stamp
< oldest_time
)) {
266 tl
->total
-= tl
->packet_count
[tl
->head
];
267 tl
->packet_count
[tl
->head
] = 0;
268 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
271 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
277 * increment traffic load value for tid and also remove
278 * any old values if passed the certain time period
280 static u8
rs_tl_add_packet(struct iwl_lq_sta
*lq_data
,
281 struct ieee80211_hdr
*hdr
)
283 u32 curr_time
= jiffies_to_msecs(jiffies
);
286 struct iwl_traffic_load
*tl
= NULL
;
289 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
290 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
293 return MAX_TID_COUNT
;
295 tl
= &lq_data
->load
[tid
];
297 curr_time
-= curr_time
% TID_ROUND_VALUE
;
299 /* Happens only for the first packet. Initialize the data */
300 if (!(tl
->queue_count
)) {
302 tl
->time_stamp
= curr_time
;
305 tl
->packet_count
[0] = 1;
306 return MAX_TID_COUNT
;
309 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
310 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
312 /* The history is too long: remove data that is older than */
313 /* TID_MAX_TIME_DIFF */
314 if (index
>= TID_QUEUE_MAX_SIZE
)
315 rs_tl_rm_old_stats(tl
, curr_time
);
317 index
= (tl
->head
+ index
) % TID_QUEUE_MAX_SIZE
;
318 tl
->packet_count
[index
] = tl
->packet_count
[index
] + 1;
319 tl
->total
= tl
->total
+ 1;
321 if ((index
+ 1) > tl
->queue_count
)
322 tl
->queue_count
= index
+ 1;
328 get the traffic load value for tid
330 static u32
rs_tl_get_load(struct iwl_lq_sta
*lq_data
, u8 tid
)
332 u32 curr_time
= jiffies_to_msecs(jiffies
);
335 struct iwl_traffic_load
*tl
= NULL
;
337 if (tid
>= TID_MAX_LOAD_COUNT
)
340 tl
= &(lq_data
->load
[tid
]);
342 curr_time
-= curr_time
% TID_ROUND_VALUE
;
344 if (!(tl
->queue_count
))
347 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
348 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
350 /* The history is too long: remove data that is older than */
351 /* TID_MAX_TIME_DIFF */
352 if (index
>= TID_QUEUE_MAX_SIZE
)
353 rs_tl_rm_old_stats(tl
, curr_time
);
358 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv
*priv
,
359 struct iwl_lq_sta
*lq_data
, u8 tid
,
360 struct ieee80211_sta
*sta
)
362 if (rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
363 IWL_DEBUG_HT(priv
, "Starting Tx agg: STA: %pM tid: %d\n",
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_priv
*priv
,
471 struct iwl_scale_tbl_info
*tbl
,
472 int index
, u8 use_green
)
474 u32 rate_n_flags
= 0;
476 if (is_legacy(tbl
->lq_type
)) {
477 rate_n_flags
= iwl_rates
[index
].plcp
;
478 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
479 rate_n_flags
|= RATE_MCS_CCK_MSK
;
481 } else if (is_Ht(tbl
->lq_type
)) {
482 if (index
> IWL_LAST_OFDM_RATE
) {
483 IWL_ERR(priv
, "Invalid HT rate index %d\n", index
);
484 index
= IWL_LAST_OFDM_RATE
;
486 rate_n_flags
= RATE_MCS_HT_MSK
;
488 if (is_siso(tbl
->lq_type
))
489 rate_n_flags
|= iwl_rates
[index
].plcp_siso
;
490 else if (is_mimo2(tbl
->lq_type
))
491 rate_n_flags
|= iwl_rates
[index
].plcp_mimo2
;
493 rate_n_flags
|= iwl_rates
[index
].plcp_mimo3
;
495 IWL_ERR(priv
, "Invalid tbl->lq_type %d\n", tbl
->lq_type
);
498 rate_n_flags
|= ((tbl
->ant_type
<< RATE_MCS_ANT_POS
) &
499 RATE_MCS_ANT_ABC_MSK
);
501 if (is_Ht(tbl
->lq_type
)) {
504 rate_n_flags
|= RATE_MCS_DUP_MSK
;
506 rate_n_flags
|= RATE_MCS_FAT_MSK
;
509 rate_n_flags
|= RATE_MCS_SGI_MSK
;
512 rate_n_flags
|= RATE_MCS_GF_MSK
;
513 if (is_siso(tbl
->lq_type
) && tbl
->is_SGI
) {
514 rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
515 IWL_ERR(priv
, "GF was set with SGI:SISO\n");
523 * Interpret uCode API's rate_n_flags format,
524 * fill "search" or "active" tx mode table.
526 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags
,
527 enum ieee80211_band band
,
528 struct iwl_scale_tbl_info
*tbl
,
531 u32 ant_msk
= (rate_n_flags
& RATE_MCS_ANT_ABC_MSK
);
532 u8 num_of_ant
= get_num_of_ant_from_rate(rate_n_flags
);
535 *rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
537 if (*rate_idx
== IWL_RATE_INVALID
) {
541 tbl
->is_SGI
= 0; /* default legacy setup */
544 tbl
->ant_type
= (ant_msk
>> RATE_MCS_ANT_POS
);
545 tbl
->lq_type
= LQ_NONE
;
547 /* legacy rate format */
548 if (!(rate_n_flags
& RATE_MCS_HT_MSK
)) {
549 if (num_of_ant
== 1) {
550 if (band
== IEEE80211_BAND_5GHZ
)
557 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
560 if ((rate_n_flags
& RATE_MCS_FAT_MSK
) ||
561 (rate_n_flags
& RATE_MCS_DUP_MSK
))
564 if (rate_n_flags
& RATE_MCS_DUP_MSK
)
567 mcs
= rs_extract_rate(rate_n_flags
);
570 if (mcs
<= IWL_RATE_SISO_60M_PLCP
) {
572 tbl
->lq_type
= LQ_SISO
; /*else NONE*/
574 } else if (mcs
<= IWL_RATE_MIMO2_60M_PLCP
) {
576 tbl
->lq_type
= LQ_MIMO2
;
580 tbl
->lq_type
= LQ_MIMO3
;
586 /* switch to another antenna/antennas and return 1 */
587 /* if no other valid antenna found, return 0 */
588 static int rs_toggle_antenna(u32 valid_ant
, u32
*rate_n_flags
,
589 struct iwl_scale_tbl_info
*tbl
)
593 if (!tbl
->ant_type
|| tbl
->ant_type
> ANT_ABC
)
596 if (!rs_is_valid_ant(valid_ant
, tbl
->ant_type
))
599 new_ant_type
= ant_toggle_lookup
[tbl
->ant_type
];
601 while ((new_ant_type
!= tbl
->ant_type
) &&
602 !rs_is_valid_ant(valid_ant
, new_ant_type
))
603 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
605 if (new_ant_type
== tbl
->ant_type
)
608 tbl
->ant_type
= new_ant_type
;
609 *rate_n_flags
&= ~RATE_MCS_ANT_ABC_MSK
;
610 *rate_n_flags
|= new_ant_type
<< RATE_MCS_ANT_POS
;
614 /* FIXME:RS: in 4965 we don't use greenfield at all */
615 /* FIXME:RS: don't use greenfield for now in TX */
617 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
619 return (conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) &&
620 priv
->current_ht_config
.is_green_field
&&
621 !priv
->current_ht_config
.non_GF_STA_present
;
624 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
630 * rs_get_supported_rates - get the available rates
632 * if management frame or broadcast frame only return
633 * basic available rates.
636 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
637 struct ieee80211_hdr
*hdr
,
638 enum iwl_table_type rate_type
)
640 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
641 lq_sta
->active_rate_basic
)
642 return lq_sta
->active_rate_basic
;
644 if (is_legacy(rate_type
)) {
645 return lq_sta
->active_legacy_rate
;
647 if (is_siso(rate_type
))
648 return lq_sta
->active_siso_rate
;
649 else if (is_mimo2(rate_type
))
650 return lq_sta
->active_mimo2_rate
;
652 return lq_sta
->active_mimo3_rate
;
656 static u16
rs_get_adjacent_rate(struct iwl_priv
*priv
, u8 index
, u16 rate_mask
,
659 u8 high
= IWL_RATE_INVALID
;
660 u8 low
= IWL_RATE_INVALID
;
662 /* 802.11A or ht walks to the next literal adjacent rate in
664 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
668 /* Find the previous rate that is in the rate mask */
670 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
671 if (rate_mask
& mask
) {
677 /* Find the next rate that is in the rate mask */
679 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
680 if (rate_mask
& mask
) {
686 return (high
<< 8) | low
;
690 while (low
!= IWL_RATE_INVALID
) {
691 low
= iwl_rates
[low
].prev_rs
;
692 if (low
== IWL_RATE_INVALID
)
694 if (rate_mask
& (1 << low
))
696 IWL_DEBUG_RATE(priv
, "Skipping masked lower rate: %d\n", low
);
700 while (high
!= IWL_RATE_INVALID
) {
701 high
= iwl_rates
[high
].next_rs
;
702 if (high
== IWL_RATE_INVALID
)
704 if (rate_mask
& (1 << high
))
706 IWL_DEBUG_RATE(priv
, "Skipping masked higher rate: %d\n", high
);
709 return (high
<< 8) | low
;
712 static u32
rs_get_lower_rate(struct iwl_lq_sta
*lq_sta
,
713 struct iwl_scale_tbl_info
*tbl
,
714 u8 scale_index
, u8 ht_possible
)
719 u8 switch_to_legacy
= 0;
720 u8 is_green
= lq_sta
->is_green
;
722 /* check if we need to switch from HT to legacy rates.
723 * assumption is that mandatory rates (1Mbps or 6Mbps)
724 * are always supported (spec demand) */
725 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
726 switch_to_legacy
= 1;
727 scale_index
= rs_ht_to_legacy
[scale_index
];
728 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
733 if (num_of_ant(tbl
->ant_type
) > 1)
734 tbl
->ant_type
= ANT_A
;/*FIXME:RS*/
740 rate_mask
= rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
);
742 /* Mask with station rate restriction */
743 if (is_legacy(tbl
->lq_type
)) {
744 /* supp_rates has no CCK bits in A mode */
745 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
746 rate_mask
= (u16
)(rate_mask
&
747 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
749 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
752 /* If we switched from HT to legacy, check current rate */
753 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
758 high_low
= rs_get_adjacent_rate(lq_sta
->drv
, scale_index
, rate_mask
,
760 low
= high_low
& 0xff;
762 if (low
== IWL_RATE_INVALID
)
766 return rate_n_flags_from_tbl(lq_sta
->drv
, tbl
, low
, is_green
);
770 * mac80211 sends us Tx status
772 static void rs_tx_status(void *priv_r
, struct ieee80211_supported_band
*sband
,
773 struct ieee80211_sta
*sta
, void *priv_sta
,
778 int rs_index
, index
= 0;
779 struct iwl_lq_sta
*lq_sta
= priv_sta
;
780 struct iwl_link_quality_cmd
*table
;
781 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
782 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
783 struct ieee80211_hw
*hw
= priv
->hw
;
784 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
785 struct iwl_rate_scale_data
*window
= NULL
;
786 struct iwl_rate_scale_data
*search_win
= NULL
;
788 struct iwl_scale_tbl_info tbl_type
;
789 struct iwl_scale_tbl_info
*curr_tbl
, *search_tbl
;
793 IWL_DEBUG_RATE_LIMIT(priv
, "get frame ack response, update rate scale window\n");
795 if (!ieee80211_is_data(hdr
->frame_control
) ||
796 is_multicast_ether_addr(hdr
->addr1
))
799 /* This packet was aggregated but doesn't carry rate scale info */
800 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
801 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
804 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
)
807 retries
= info
->status
.rates
[0].count
- 1;
812 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
813 !lq_sta
->ibss_sta_added
)
817 active_index
= lq_sta
->active_tbl
;
819 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
820 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
821 window
= (struct iwl_rate_scale_data
*)&(curr_tbl
->win
[0]);
822 search_win
= (struct iwl_rate_scale_data
*)&(search_tbl
->win
[0]);
825 * Ignore this Tx frame response if its initial rate doesn't match
826 * that of latest Link Quality command. There may be stragglers
827 * from a previous Link Quality command, but we're no longer interested
828 * in those; they're either from the "active" mode while we're trying
829 * to check "search" mode, or a prior "search" mode after we've moved
830 * to a new "search" mode (which might become the new "active" mode).
832 tx_rate
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
833 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
834 if (priv
->band
== IEEE80211_BAND_5GHZ
)
835 rs_index
-= IWL_FIRST_OFDM_RATE
;
837 if ((info
->status
.rates
[0].idx
< 0) ||
838 (tbl_type
.is_SGI
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_SHORT_GI
)) ||
839 (tbl_type
.is_fat
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_40_MHZ_WIDTH
)) ||
840 (tbl_type
.is_dup
!= !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_DUP_DATA
)) ||
841 (tbl_type
.ant_type
!= info
->antenna_sel_tx
) ||
842 (!!(tx_rate
& RATE_MCS_HT_MSK
) != !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_MCS
)) ||
843 (!!(tx_rate
& RATE_MCS_GF_MSK
) != !!(info
->status
.rates
[0].flags
& IEEE80211_TX_RC_GREEN_FIELD
)) ||
844 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
845 hw
->wiphy
->bands
[info
->band
]->bitrates
[info
->status
.rates
[0].idx
].bitrate
)) {
846 IWL_DEBUG_RATE(priv
, "initial rate does not match 0x%x\n", tx_rate
);
847 /* the last LQ command could failed so the LQ in ucode not
848 * the same in driver sync up
850 lq_sta
->missed_rate_counter
++;
851 if (lq_sta
->missed_rate_counter
> IWL_MISSED_RATE_MAX
) {
852 lq_sta
->missed_rate_counter
= 0;
853 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
858 lq_sta
->missed_rate_counter
= 0;
859 /* Update frame history window with "failure" for each Tx retry. */
861 /* Look up the rate and other info used for each tx attempt.
862 * Each tx attempt steps one entry deeper in the rate table. */
863 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
864 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
,
865 &tbl_type
, &rs_index
);
867 /* If type matches "search" table,
868 * add failure to "search" history */
869 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
870 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
871 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
872 if (search_tbl
->expected_tpt
)
873 tpt
= search_tbl
->expected_tpt
[rs_index
];
876 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
878 /* Else if type matches "current/active" table,
879 * add failure to "current/active" history */
880 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
881 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
882 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
883 if (curr_tbl
->expected_tpt
)
884 tpt
= curr_tbl
->expected_tpt
[rs_index
];
887 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
890 /* If not searching for a new mode, increment failed counter
891 * ... this helps determine when to start searching again */
892 if (lq_sta
->stay_in_tbl
)
893 lq_sta
->total_failed
++;
900 * Find (by rate) the history window to update with final Tx attempt;
901 * if Tx was successful first try, use original rate,
902 * else look up the rate that was, finally, successful.
904 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
905 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
907 /* Update frame history window with "success" if Tx got ACKed ... */
908 status
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
910 /* If type matches "search" table,
911 * add final tx status to "search" history */
912 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
913 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
914 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
915 if (search_tbl
->expected_tpt
)
916 tpt
= search_tbl
->expected_tpt
[rs_index
];
919 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
)
920 rs_collect_tx_data(search_win
, rs_index
, tpt
,
921 info
->status
.ampdu_ack_len
,
922 info
->status
.ampdu_ack_map
);
924 rs_collect_tx_data(search_win
, rs_index
, tpt
,
926 /* Else if type matches "current/active" table,
927 * add final tx status to "current/active" history */
928 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
929 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
930 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
931 if (curr_tbl
->expected_tpt
)
932 tpt
= curr_tbl
->expected_tpt
[rs_index
];
935 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
)
936 rs_collect_tx_data(window
, rs_index
, tpt
,
937 info
->status
.ampdu_ack_len
,
938 info
->status
.ampdu_ack_map
);
940 rs_collect_tx_data(window
, rs_index
, tpt
,
944 /* If not searching for new mode, increment success/failed counter
945 * ... these help determine when to start searching again */
946 if (lq_sta
->stay_in_tbl
) {
947 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
) {
948 lq_sta
->total_success
+= info
->status
.ampdu_ack_map
;
949 lq_sta
->total_failed
+=
950 (info
->status
.ampdu_ack_len
- info
->status
.ampdu_ack_map
);
953 lq_sta
->total_success
++;
955 lq_sta
->total_failed
++;
959 /* See if there's a better rate or modulation mode to try. */
960 if (sta
&& sta
->supp_rates
[sband
->band
])
961 rs_rate_scale_perform(priv
, hdr
, sta
, lq_sta
);
967 * Begin a period of staying with a selected modulation mode.
968 * Set "stay_in_tbl" flag to prevent any mode switches.
969 * Set frame tx success limits according to legacy vs. high-throughput,
970 * and reset overall (spanning all rates) tx success history statistics.
971 * These control how long we stay using same modulation mode before
972 * searching for a new mode.
974 static void rs_set_stay_in_table(struct iwl_priv
*priv
, u8 is_legacy
,
975 struct iwl_lq_sta
*lq_sta
)
977 IWL_DEBUG_RATE(priv
, "we are staying in the same table\n");
978 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
980 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
981 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
982 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
984 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
985 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
986 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
988 lq_sta
->table_count
= 0;
989 lq_sta
->total_failed
= 0;
990 lq_sta
->total_success
= 0;
994 * Find correct throughput table for given mode of modulation
996 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
997 struct iwl_scale_tbl_info
*tbl
)
999 if (is_legacy(tbl
->lq_type
)) {
1000 if (!is_a_band(tbl
->lq_type
))
1001 tbl
->expected_tpt
= expected_tpt_G
;
1003 tbl
->expected_tpt
= expected_tpt_A
;
1004 } else if (is_siso(tbl
->lq_type
)) {
1005 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1007 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
1009 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
1010 else if (tbl
->is_SGI
)
1011 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
1013 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1015 } else if (is_mimo(tbl
->lq_type
)) { /* FIXME:need to separate mimo2/3 */
1016 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1018 tbl
->expected_tpt
= expected_tpt_mimo40MHzSGI
;
1020 tbl
->expected_tpt
= expected_tpt_mimo40MHz
;
1021 else if (tbl
->is_SGI
)
1022 tbl
->expected_tpt
= expected_tpt_mimo20MHzSGI
;
1024 tbl
->expected_tpt
= expected_tpt_mimo20MHz
;
1026 tbl
->expected_tpt
= expected_tpt_G
;
1030 * Find starting rate for new "search" high-throughput mode of modulation.
1031 * Goal is to find lowest expected rate (under perfect conditions) that is
1032 * above the current measured throughput of "active" mode, to give new mode
1033 * a fair chance to prove itself without too many challenges.
1035 * This gets called when transitioning to more aggressive modulation
1036 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1037 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1038 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1039 * bit rate will typically need to increase, but not if performance was bad.
1041 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1042 struct iwl_lq_sta
*lq_sta
,
1043 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1044 u16 rate_mask
, s8 index
)
1046 /* "active" values */
1047 struct iwl_scale_tbl_info
*active_tbl
=
1048 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1049 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1050 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1052 /* expected "search" throughput */
1053 s32
*tpt_tbl
= tbl
->expected_tpt
;
1055 s32 new_rate
, high
, low
, start_hi
;
1059 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1062 high_low
= rs_get_adjacent_rate(priv
, rate
, rate_mask
,
1065 low
= high_low
& 0xff;
1066 high
= (high_low
>> 8) & 0xff;
1069 * Lower the "search" bit rate, to give new "search" mode
1070 * approximately the same throughput as "active" if:
1072 * 1) "Active" mode has been working modestly well (but not
1073 * great), and expected "search" throughput (under perfect
1074 * conditions) at candidate rate is above the actual
1075 * measured "active" throughput (but less than expected
1076 * "active" throughput under perfect conditions).
1078 * 2) "Active" mode has been working perfectly or very well
1079 * and expected "search" throughput (under perfect
1080 * conditions) at candidate rate is above expected
1081 * "active" throughput (under perfect conditions).
1083 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1084 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1085 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1086 (tpt_tbl
[rate
] <= active_tpt
))) ||
1087 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1088 (tpt_tbl
[rate
] > active_tpt
))) {
1090 /* (2nd or later pass)
1091 * If we've already tried to raise the rate, and are
1092 * now trying to lower it, use the higher rate. */
1093 if (start_hi
!= IWL_RATE_INVALID
) {
1094 new_rate
= start_hi
;
1100 /* Loop again with lower rate */
1101 if (low
!= IWL_RATE_INVALID
)
1104 /* Lower rate not available, use the original */
1108 /* Else try to raise the "search" rate to match "active" */
1110 /* (2nd or later pass)
1111 * If we've already tried to lower the rate, and are
1112 * now trying to raise it, use the lower rate. */
1113 if (new_rate
!= IWL_RATE_INVALID
)
1116 /* Loop again with higher rate */
1117 else if (high
!= IWL_RATE_INVALID
) {
1121 /* Higher rate not available, use the original */
1133 * Set up search table for MIMO
1135 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1136 struct iwl_lq_sta
*lq_sta
,
1137 struct ieee80211_conf
*conf
,
1138 struct ieee80211_sta
*sta
,
1139 struct iwl_scale_tbl_info
*tbl
, int index
)
1143 s8 is_green
= lq_sta
->is_green
;
1145 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1148 if (((sta
->ht_cap
.cap
& IEEE80211_HT_CAP_SM_PS
) >> 2)
1149 == WLAN_HT_CAP_SM_PS_STATIC
)
1152 /* Need both Tx chains/antennas to support MIMO */
1153 if (priv
->hw_params
.tx_chains_num
< 2)
1156 IWL_DEBUG_RATE(priv
, "LQ: try to switch to MIMO2\n");
1158 tbl
->lq_type
= LQ_MIMO2
;
1159 tbl
->is_dup
= lq_sta
->is_dup
;
1161 rate_mask
= lq_sta
->active_mimo2_rate
;
1163 if (priv
->current_ht_config
.supported_chan_width
1164 == IWL_CHANNEL_WIDTH_40MHZ
)
1169 /* FIXME: - don't toggle SGI here
1171 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1175 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1181 rs_set_expected_tpt_table(lq_sta
, tbl
);
1183 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1185 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 best rate %d mask %X\n", rate
, rate_mask
);
1187 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1188 IWL_DEBUG_RATE(priv
, "Can't switch with index %d rate mask %x\n",
1192 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1194 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1195 tbl
->current_rate
, is_green
);
1200 * Set up search table for SISO
1202 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1203 struct iwl_lq_sta
*lq_sta
,
1204 struct ieee80211_conf
*conf
,
1205 struct ieee80211_sta
*sta
,
1206 struct iwl_scale_tbl_info
*tbl
, int index
)
1209 u8 is_green
= lq_sta
->is_green
;
1212 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1215 IWL_DEBUG_RATE(priv
, "LQ: try to switch to SISO\n");
1217 tbl
->is_dup
= lq_sta
->is_dup
;
1218 tbl
->lq_type
= LQ_SISO
;
1220 rate_mask
= lq_sta
->active_siso_rate
;
1222 if (priv
->current_ht_config
.supported_chan_width
1223 == IWL_CHANNEL_WIDTH_40MHZ
)
1228 /* FIXME: - don't toggle SGI here
1230 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1234 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1241 tbl
->is_SGI
= 0; /*11n spec: no SGI in SISO+Greenfield*/
1243 rs_set_expected_tpt_table(lq_sta
, tbl
);
1244 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1246 IWL_DEBUG_RATE(priv
, "LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1247 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1248 IWL_DEBUG_RATE(priv
, "can not switch with index %d rate mask %x\n",
1252 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1253 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1254 tbl
->current_rate
, is_green
);
1259 * Try to switch to new modulation mode from legacy
1261 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1262 struct iwl_lq_sta
*lq_sta
,
1263 struct ieee80211_conf
*conf
,
1264 struct ieee80211_sta
*sta
,
1267 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1268 struct iwl_scale_tbl_info
*search_tbl
=
1269 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1270 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1271 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1272 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1273 u8 start_action
= tbl
->action
;
1274 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1275 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1279 switch (tbl
->action
) {
1280 case IWL_LEGACY_SWITCH_ANTENNA1
:
1281 case IWL_LEGACY_SWITCH_ANTENNA2
:
1282 IWL_DEBUG_RATE(priv
, "LQ: Legacy toggle Antenna\n");
1284 lq_sta
->action_counter
++;
1286 if ((tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA1
&&
1287 tx_chains_num
<= 1) ||
1288 (tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA2
&&
1289 tx_chains_num
<= 2))
1292 /* Don't change antenna if success has been great */
1293 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1296 /* Set up search table to try other antenna */
1297 memcpy(search_tbl
, tbl
, sz
);
1299 if (rs_toggle_antenna(valid_tx_ant
,
1300 &search_tbl
->current_rate
, search_tbl
)) {
1301 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1305 case IWL_LEGACY_SWITCH_SISO
:
1306 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to SISO\n");
1308 /* Set up search table to try SISO */
1309 memcpy(search_tbl
, tbl
, sz
);
1310 search_tbl
->is_SGI
= 0;
1311 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1314 lq_sta
->action_counter
= 0;
1319 case IWL_LEGACY_SWITCH_MIMO2_AB
:
1320 case IWL_LEGACY_SWITCH_MIMO2_AC
:
1321 case IWL_LEGACY_SWITCH_MIMO2_BC
:
1322 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to MIMO2\n");
1324 /* Set up search table to try MIMO */
1325 memcpy(search_tbl
, tbl
, sz
);
1326 search_tbl
->is_SGI
= 0;
1328 if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AB
)
1329 search_tbl
->ant_type
= ANT_AB
;
1330 else if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AC
)
1331 search_tbl
->ant_type
= ANT_AC
;
1333 search_tbl
->ant_type
= ANT_BC
;
1335 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1338 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1341 lq_sta
->action_counter
= 0;
1347 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2_BC
)
1348 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1350 if (tbl
->action
== start_action
)
1354 search_tbl
->lq_type
= LQ_NONE
;
1358 lq_sta
->search_better_tbl
= 1;
1360 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2_BC
)
1361 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1367 * Try to switch to new modulation mode from SISO
1369 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1370 struct iwl_lq_sta
*lq_sta
,
1371 struct ieee80211_conf
*conf
,
1372 struct ieee80211_sta
*sta
, int index
)
1374 u8 is_green
= lq_sta
->is_green
;
1375 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1376 struct iwl_scale_tbl_info
*search_tbl
=
1377 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1378 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1379 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1380 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1381 u8 start_action
= tbl
->action
;
1382 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1383 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1387 lq_sta
->action_counter
++;
1388 switch (tbl
->action
) {
1389 case IWL_SISO_SWITCH_ANTENNA1
:
1390 case IWL_SISO_SWITCH_ANTENNA2
:
1391 IWL_DEBUG_RATE(priv
, "LQ: SISO toggle Antenna\n");
1393 if ((tbl
->action
== IWL_SISO_SWITCH_ANTENNA1
&&
1394 tx_chains_num
<= 1) ||
1395 (tbl
->action
== IWL_SISO_SWITCH_ANTENNA2
&&
1396 tx_chains_num
<= 2))
1399 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1402 memcpy(search_tbl
, tbl
, sz
);
1403 if (rs_toggle_antenna(valid_tx_ant
,
1404 &search_tbl
->current_rate
, search_tbl
))
1407 case IWL_SISO_SWITCH_MIMO2_AB
:
1408 case IWL_SISO_SWITCH_MIMO2_AC
:
1409 case IWL_SISO_SWITCH_MIMO2_BC
:
1410 IWL_DEBUG_RATE(priv
, "LQ: SISO switch to MIMO2\n");
1411 memcpy(search_tbl
, tbl
, sz
);
1412 search_tbl
->is_SGI
= 0;
1414 if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AB
)
1415 search_tbl
->ant_type
= ANT_AB
;
1416 else if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AC
)
1417 search_tbl
->ant_type
= ANT_AC
;
1419 search_tbl
->ant_type
= ANT_BC
;
1421 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1424 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1429 case IWL_SISO_SWITCH_GI
:
1431 !(priv
->current_ht_config
.sgf
&
1435 !(priv
->current_ht_config
.sgf
&
1439 IWL_DEBUG_RATE(priv
, "LQ: SISO toggle SGI/NGI\n");
1441 memcpy(search_tbl
, tbl
, sz
);
1447 "SGI was set in GF+SISO\n");
1449 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1450 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1452 s32 tpt
= lq_sta
->last_tpt
/ 100;
1453 if (tpt
>= search_tbl
->expected_tpt
[index
])
1456 search_tbl
->current_rate
=
1457 rate_n_flags_from_tbl(priv
, search_tbl
,
1462 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1463 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1465 if (tbl
->action
== start_action
)
1468 search_tbl
->lq_type
= LQ_NONE
;
1472 lq_sta
->search_better_tbl
= 1;
1474 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1475 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1480 * Try to switch to new modulation mode from MIMO
1482 static int rs_move_mimo_to_other(struct iwl_priv
*priv
,
1483 struct iwl_lq_sta
*lq_sta
,
1484 struct ieee80211_conf
*conf
,
1485 struct ieee80211_sta
*sta
, int index
)
1487 s8 is_green
= lq_sta
->is_green
;
1488 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1489 struct iwl_scale_tbl_info
*search_tbl
=
1490 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1491 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1492 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1493 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1494 u8 start_action
= tbl
->action
;
1495 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1496 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1500 lq_sta
->action_counter
++;
1501 switch (tbl
->action
) {
1502 case IWL_MIMO2_SWITCH_ANTENNA1
:
1503 case IWL_MIMO2_SWITCH_ANTENNA2
:
1504 IWL_DEBUG_RATE(priv
, "LQ: MIMO toggle Antennas\n");
1506 if (tx_chains_num
<= 2)
1509 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1512 memcpy(search_tbl
, tbl
, sz
);
1513 if (rs_toggle_antenna(valid_tx_ant
,
1514 &search_tbl
->current_rate
, search_tbl
))
1517 case IWL_MIMO2_SWITCH_SISO_A
:
1518 case IWL_MIMO2_SWITCH_SISO_B
:
1519 case IWL_MIMO2_SWITCH_SISO_C
:
1520 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 switch to SISO\n");
1522 /* Set up new search table for SISO */
1523 memcpy(search_tbl
, tbl
, sz
);
1525 if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_A
)
1526 search_tbl
->ant_type
= ANT_A
;
1527 else if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_B
)
1528 search_tbl
->ant_type
= ANT_B
;
1530 search_tbl
->ant_type
= ANT_C
;
1532 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1535 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1542 case IWL_MIMO2_SWITCH_GI
:
1544 !(priv
->current_ht_config
.sgf
&
1548 !(priv
->current_ht_config
.sgf
&
1552 IWL_DEBUG_RATE(priv
, "LQ: MIMO toggle SGI/NGI\n");
1554 /* Set up new search table for MIMO */
1555 memcpy(search_tbl
, tbl
, sz
);
1556 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1557 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1559 * If active table already uses the fastest possible
1560 * modulation (dual stream with short guard interval),
1561 * and it's working well, there's no need to look
1562 * for a better type of modulation!
1565 s32 tpt
= lq_sta
->last_tpt
/ 100;
1566 if (tpt
>= search_tbl
->expected_tpt
[index
])
1569 search_tbl
->current_rate
=
1570 rate_n_flags_from_tbl(priv
, search_tbl
,
1576 if (tbl
->action
> IWL_MIMO2_SWITCH_GI
)
1577 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1579 if (tbl
->action
== start_action
)
1582 search_tbl
->lq_type
= LQ_NONE
;
1585 lq_sta
->search_better_tbl
= 1;
1587 if (tbl
->action
> IWL_MIMO2_SWITCH_GI
)
1588 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1594 * Check whether we should continue using same modulation mode, or
1595 * begin search for a new mode, based on:
1596 * 1) # tx successes or failures while using this mode
1597 * 2) # times calling this function
1598 * 3) elapsed time in this mode (not used, for now)
1600 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
)
1602 struct iwl_scale_tbl_info
*tbl
;
1605 int flush_interval_passed
= 0;
1606 struct iwl_priv
*priv
;
1609 active_tbl
= lq_sta
->active_tbl
;
1611 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1613 /* If we've been disallowing search, see if we should now allow it */
1614 if (lq_sta
->stay_in_tbl
) {
1616 /* Elapsed time using current modulation mode */
1617 if (lq_sta
->flush_timer
)
1618 flush_interval_passed
=
1620 (unsigned long)(lq_sta
->flush_timer
+
1621 IWL_RATE_SCALE_FLUSH_INTVL
));
1624 * Check if we should allow search for new modulation mode.
1625 * If many frames have failed or succeeded, or we've used
1626 * this same modulation for a long time, allow search, and
1627 * reset history stats that keep track of whether we should
1628 * allow a new search. Also (below) reset all bitmaps and
1629 * stats in active history.
1631 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1632 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1633 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1634 && (flush_interval_passed
))) {
1635 IWL_DEBUG_RATE(priv
, "LQ: stay is expired %d %d %d\n:",
1636 lq_sta
->total_failed
,
1637 lq_sta
->total_success
,
1638 flush_interval_passed
);
1640 /* Allow search for new mode */
1641 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1642 lq_sta
->total_failed
= 0;
1643 lq_sta
->total_success
= 0;
1644 lq_sta
->flush_timer
= 0;
1647 * Else if we've used this modulation mode enough repetitions
1648 * (regardless of elapsed time or success/failure), reset
1649 * history bitmaps and rate-specific stats for all rates in
1653 lq_sta
->table_count
++;
1654 if (lq_sta
->table_count
>=
1655 lq_sta
->table_count_limit
) {
1656 lq_sta
->table_count
= 0;
1658 IWL_DEBUG_RATE(priv
, "LQ: stay in table clear win\n");
1659 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1660 rs_rate_scale_clear_window(
1665 /* If transitioning to allow "search", reset all history
1666 * bitmaps and stats in active table (this will become the new
1667 * "search" table). */
1668 if (!lq_sta
->stay_in_tbl
) {
1669 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1670 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1676 * Do rate scaling and search for new modulation mode.
1678 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
1679 struct ieee80211_hdr
*hdr
,
1680 struct ieee80211_sta
*sta
,
1681 struct iwl_lq_sta
*lq_sta
)
1683 struct ieee80211_hw
*hw
= priv
->hw
;
1684 struct ieee80211_conf
*conf
= &hw
->conf
;
1685 int low
= IWL_RATE_INVALID
;
1686 int high
= IWL_RATE_INVALID
;
1689 struct iwl_rate_scale_data
*window
= NULL
;
1690 int current_tpt
= IWL_INVALID_VALUE
;
1691 int low_tpt
= IWL_INVALID_VALUE
;
1692 int high_tpt
= IWL_INVALID_VALUE
;
1694 s8 scale_action
= 0;
1697 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
1698 u16 rate_scale_index_msk
= 0;
1705 u8 tid
= MAX_TID_COUNT
;
1706 struct iwl_tid_data
*tid_data
;
1708 IWL_DEBUG_RATE(priv
, "rate scale calculate new rate for skb\n");
1710 /* Send management frames and broadcast/multicast data using
1712 /* TODO: this could probably be improved.. */
1713 if (!ieee80211_is_data(hdr
->frame_control
) ||
1714 is_multicast_ether_addr(hdr
->addr1
))
1717 if (!sta
|| !lq_sta
)
1720 lq_sta
->supp_rates
= sta
->supp_rates
[lq_sta
->band
];
1722 tid
= rs_tl_add_packet(lq_sta
, hdr
);
1725 * Select rate-scale / modulation-mode table to work with in
1726 * the rest of this function: "search" if searching for better
1727 * modulation mode, or "active" if doing rate scaling within a mode.
1729 if (!lq_sta
->search_better_tbl
)
1730 active_tbl
= lq_sta
->active_tbl
;
1732 active_tbl
= 1 - lq_sta
->active_tbl
;
1734 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1735 is_green
= lq_sta
->is_green
;
1737 /* current tx rate */
1738 index
= lq_sta
->last_txrate_idx
;
1740 IWL_DEBUG_RATE(priv
, "Rate scale index %d for type %d\n", index
,
1743 /* rates available for this association, and for modulation mode */
1744 rate_mask
= rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
);
1746 IWL_DEBUG_RATE(priv
, "mask 0x%04X \n", rate_mask
);
1748 /* mask with station rate restriction */
1749 if (is_legacy(tbl
->lq_type
)) {
1750 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1751 /* supp_rates has no CCK bits in A mode */
1752 rate_scale_index_msk
= (u16
) (rate_mask
&
1753 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
1755 rate_scale_index_msk
= (u16
) (rate_mask
&
1756 lq_sta
->supp_rates
);
1759 rate_scale_index_msk
= rate_mask
;
1761 if (!rate_scale_index_msk
)
1762 rate_scale_index_msk
= rate_mask
;
1764 if (!((1 << index
) & rate_scale_index_msk
)) {
1765 IWL_ERR(priv
, "Current Rate is not valid\n");
1769 /* Get expected throughput table and history window for current rate */
1770 if (!tbl
->expected_tpt
) {
1771 IWL_ERR(priv
, "tbl->expected_tpt is NULL\n");
1775 /* force user max rate if set by user */
1776 if ((lq_sta
->max_rate_idx
!= -1) &&
1777 (lq_sta
->max_rate_idx
< index
)) {
1778 index
= lq_sta
->max_rate_idx
;
1780 window
= &(tbl
->win
[index
]);
1784 window
= &(tbl
->win
[index
]);
1787 * If there is not enough history to calculate actual average
1788 * throughput, keep analyzing results of more tx frames, without
1789 * changing rate or mode (bypass most of the rest of this function).
1790 * Set up new rate table in uCode only if old rate is not supported
1791 * in current association (use new rate found above).
1793 fail_count
= window
->counter
- window
->success_counter
;
1794 if ((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
1795 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
)) {
1796 IWL_DEBUG_RATE(priv
, "LQ: still below TH. succ=%d total=%d "
1798 window
->success_counter
, window
->counter
, index
);
1800 /* Can't calculate this yet; not enough history */
1801 window
->average_tpt
= IWL_INVALID_VALUE
;
1803 /* Should we stay with this modulation mode,
1804 * or search for a new one? */
1805 rs_stay_in_table(lq_sta
);
1810 /* Else we have enough samples; calculate estimate of
1811 * actual average throughput */
1813 BUG_ON(window
->average_tpt
!= ((window
->success_ratio
*
1814 tbl
->expected_tpt
[index
] + 64) / 128));
1816 /* If we are searching for better modulation mode, check success. */
1817 if (lq_sta
->search_better_tbl
) {
1819 /* If good success, continue using the "search" mode;
1820 * no need to send new link quality command, since we're
1821 * continuing to use the setup that we've been trying. */
1822 if (window
->average_tpt
> lq_sta
->last_tpt
) {
1824 IWL_DEBUG_RATE(priv
, "LQ: SWITCHING TO NEW TABLE "
1825 "suc=%d cur-tpt=%d old-tpt=%d\n",
1826 window
->success_ratio
,
1827 window
->average_tpt
,
1830 if (!is_legacy(tbl
->lq_type
))
1831 lq_sta
->enable_counter
= 1;
1833 /* Swap tables; "search" becomes "active" */
1834 lq_sta
->active_tbl
= active_tbl
;
1835 current_tpt
= window
->average_tpt
;
1837 /* Else poor success; go back to mode in "active" table */
1840 IWL_DEBUG_RATE(priv
, "LQ: GOING BACK TO THE OLD TABLE "
1841 "suc=%d cur-tpt=%d old-tpt=%d\n",
1842 window
->success_ratio
,
1843 window
->average_tpt
,
1846 /* Nullify "search" table */
1847 tbl
->lq_type
= LQ_NONE
;
1849 /* Revert to "active" table */
1850 active_tbl
= lq_sta
->active_tbl
;
1851 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1853 /* Revert to "active" rate and throughput info */
1854 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
1855 current_tpt
= lq_sta
->last_tpt
;
1857 /* Need to set up a new rate table in uCode */
1861 /* Either way, we've made a decision; modulation mode
1862 * search is done, allow rate adjustment next time. */
1863 lq_sta
->search_better_tbl
= 0;
1864 done_search
= 1; /* Don't switch modes below! */
1868 /* (Else) not in search of better modulation mode, try for better
1869 * starting rate, while staying in this mode. */
1870 high_low
= rs_get_adjacent_rate(priv
, index
, rate_scale_index_msk
,
1872 low
= high_low
& 0xff;
1873 high
= (high_low
>> 8) & 0xff;
1875 /* If user set max rate, dont allow higher than user constrain */
1876 if ((lq_sta
->max_rate_idx
!= -1) &&
1877 (lq_sta
->max_rate_idx
< high
))
1878 high
= IWL_RATE_INVALID
;
1880 sr
= window
->success_ratio
;
1882 /* Collect measured throughputs for current and adjacent rates */
1883 current_tpt
= window
->average_tpt
;
1884 if (low
!= IWL_RATE_INVALID
)
1885 low_tpt
= tbl
->win
[low
].average_tpt
;
1886 if (high
!= IWL_RATE_INVALID
)
1887 high_tpt
= tbl
->win
[high
].average_tpt
;
1891 /* Too many failures, decrease rate */
1892 if ((sr
<= IWL_RATE_DECREASE_TH
) || (current_tpt
== 0)) {
1893 IWL_DEBUG_RATE(priv
, "decrease rate because of low success_ratio\n");
1896 /* No throughput measured yet for adjacent rates; try increase. */
1897 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
1898 (high_tpt
== IWL_INVALID_VALUE
)) {
1900 if (high
!= IWL_RATE_INVALID
&& sr
>= IWL_RATE_INCREASE_TH
)
1902 else if (low
!= IWL_RATE_INVALID
)
1906 /* Both adjacent throughputs are measured, but neither one has better
1907 * throughput; we're using the best rate, don't change it! */
1908 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1909 (high_tpt
!= IWL_INVALID_VALUE
) &&
1910 (low_tpt
< current_tpt
) &&
1911 (high_tpt
< current_tpt
))
1914 /* At least one adjacent rate's throughput is measured,
1915 * and may have better performance. */
1917 /* Higher adjacent rate's throughput is measured */
1918 if (high_tpt
!= IWL_INVALID_VALUE
) {
1919 /* Higher rate has better throughput */
1920 if (high_tpt
> current_tpt
&&
1921 sr
>= IWL_RATE_INCREASE_TH
) {
1927 /* Lower adjacent rate's throughput is measured */
1928 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
1929 /* Lower rate has better throughput */
1930 if (low_tpt
> current_tpt
) {
1931 IWL_DEBUG_RATE(priv
,
1932 "decrease rate because of low tpt\n");
1934 } else if (sr
>= IWL_RATE_INCREASE_TH
) {
1940 /* Sanity check; asked for decrease, but success rate or throughput
1941 * has been good at old rate. Don't change it. */
1942 if ((scale_action
== -1) && (low
!= IWL_RATE_INVALID
) &&
1943 ((sr
> IWL_RATE_HIGH_TH
) ||
1944 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
1947 switch (scale_action
) {
1949 /* Decrease starting rate, update uCode's rate table */
1950 if (low
!= IWL_RATE_INVALID
) {
1956 /* Increase starting rate, update uCode's rate table */
1957 if (high
!= IWL_RATE_INVALID
) {
1969 IWL_DEBUG_RATE(priv
, "choose rate scale index %d action %d low %d "
1970 "high %d type %d\n",
1971 index
, scale_action
, low
, high
, tbl
->lq_type
);
1974 /* Replace uCode's rate table for the destination station. */
1976 rate
= rate_n_flags_from_tbl(priv
, tbl
, index
, is_green
);
1977 rs_fill_link_cmd(priv
, lq_sta
, rate
);
1978 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1981 /* Should we stay with this modulation mode, or search for a new one? */
1982 rs_stay_in_table(lq_sta
);
1985 * Search for new modulation mode if we're:
1986 * 1) Not changing rates right now
1987 * 2) Not just finishing up a search
1988 * 3) Allowing a new search
1990 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
&& window
->counter
) {
1991 /* Save current throughput to compare with "search" throughput*/
1992 lq_sta
->last_tpt
= current_tpt
;
1994 /* Select a new "search" modulation mode to try.
1995 * If one is found, set up the new "search" table. */
1996 if (is_legacy(tbl
->lq_type
))
1997 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
1998 else if (is_siso(tbl
->lq_type
))
1999 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
2001 rs_move_mimo_to_other(priv
, lq_sta
, conf
, sta
, index
);
2003 /* If new "search" mode was selected, set up in uCode table */
2004 if (lq_sta
->search_better_tbl
) {
2005 /* Access the "search" table, clear its history. */
2006 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2007 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2008 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2010 /* Use new "search" start rate */
2011 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
2013 IWL_DEBUG_RATE(priv
, "Switch current mcs: %X index: %d\n",
2014 tbl
->current_rate
, index
);
2015 rs_fill_link_cmd(priv
, lq_sta
, tbl
->current_rate
);
2016 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2019 /* If the "active" (non-search) mode was legacy,
2020 * and we've tried switching antennas,
2021 * but we haven't been able to try HT modes (not available),
2022 * stay with best antenna legacy modulation for a while
2023 * before next round of mode comparisons. */
2024 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2025 if (is_legacy(tbl1
->lq_type
) && !conf_is_ht(conf
) &&
2026 lq_sta
->action_counter
>= 1) {
2027 lq_sta
->action_counter
= 0;
2028 IWL_DEBUG_RATE(priv
, "LQ: STAY in legacy table\n");
2029 rs_set_stay_in_table(priv
, 1, lq_sta
);
2032 /* If we're in an HT mode, and all 3 mode switch actions
2033 * have been tried and compared, stay in this best modulation
2034 * mode for a while before next round of mode comparisons. */
2035 if (lq_sta
->enable_counter
&&
2036 (lq_sta
->action_counter
>= IWL_ACTION_LIMIT
)) {
2037 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2038 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2039 (tid
!= MAX_TID_COUNT
)) {
2041 &priv
->stations
[lq_sta
->lq
.sta_id
].tid
[tid
];
2042 if (tid_data
->agg
.state
== IWL_AGG_OFF
) {
2043 IWL_DEBUG_RATE(priv
,
2044 "try to aggregate tid %d\n",
2046 rs_tl_turn_on_agg(priv
, tid
,
2050 lq_sta
->action_counter
= 0;
2051 rs_set_stay_in_table(priv
, 0, lq_sta
);
2055 * Else, don't search for a new modulation mode.
2056 * Put new timestamp in stay-in-modulation-mode flush timer if:
2057 * 1) Not changing rates right now
2058 * 2) Not just finishing up a search
2059 * 3) flush timer is empty
2062 if ((!update_lq
) && (!done_search
) && (!lq_sta
->flush_timer
))
2063 lq_sta
->flush_timer
= jiffies
;
2067 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, index
, is_green
);
2069 lq_sta
->last_txrate_idx
= i
;
2075 static void rs_initialize_lq(struct iwl_priv
*priv
,
2076 struct ieee80211_conf
*conf
,
2077 struct ieee80211_sta
*sta
,
2078 struct iwl_lq_sta
*lq_sta
)
2080 struct iwl_scale_tbl_info
*tbl
;
2084 u8 use_green
= rs_use_green(priv
, conf
);
2088 if (!sta
|| !lq_sta
)
2091 i
= lq_sta
->last_txrate_idx
;
2093 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2094 (priv
->iw_mode
== NL80211_IFTYPE_ADHOC
))
2097 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2099 if (!lq_sta
->search_better_tbl
)
2100 active_tbl
= lq_sta
->active_tbl
;
2102 active_tbl
= 1 - lq_sta
->active_tbl
;
2104 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2106 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2109 rate
= iwl_rates
[i
].plcp
;
2110 tbl
->ant_type
= first_antenna(valid_tx_ant
);
2111 rate
|= tbl
->ant_type
<< RATE_MCS_ANT_POS
;
2113 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2114 rate
|= RATE_MCS_CCK_MSK
;
2116 rs_get_tbl_info_from_mcs(rate
, priv
->band
, tbl
, &rate_idx
);
2117 if (!rs_is_valid_ant(valid_tx_ant
, tbl
->ant_type
))
2118 rs_toggle_antenna(valid_tx_ant
, &rate
, tbl
);
2120 rate
= rate_n_flags_from_tbl(priv
, tbl
, rate_idx
, use_green
);
2121 tbl
->current_rate
= rate
;
2122 rs_set_expected_tpt_table(lq_sta
, tbl
);
2123 rs_fill_link_cmd(NULL
, lq_sta
, rate
);
2124 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2129 static void rs_get_rate(void *priv_r
, struct ieee80211_sta
*sta
, void *priv_sta
,
2130 struct ieee80211_tx_rate_control
*txrc
)
2133 struct sk_buff
*skb
= txrc
->skb
;
2134 struct ieee80211_supported_band
*sband
= txrc
->sband
;
2135 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2136 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2137 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2138 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2139 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2143 IWL_DEBUG_RATE_LIMIT(priv
, "rate scale calculate new rate for skb\n");
2145 /* Get max rate if user set max rate */
2147 lq_sta
->max_rate_idx
= txrc
->max_rate_idx
;
2148 if ((sband
->band
== IEEE80211_BAND_5GHZ
) &&
2149 (lq_sta
->max_rate_idx
!= -1))
2150 lq_sta
->max_rate_idx
+= IWL_FIRST_OFDM_RATE
;
2151 if ((lq_sta
->max_rate_idx
< 0) ||
2152 (lq_sta
->max_rate_idx
>= IWL_RATE_COUNT
))
2153 lq_sta
->max_rate_idx
= -1;
2157 mask_bit
= sta
->supp_rates
[sband
->band
];
2159 /* Send management frames and broadcast/multicast data using lowest
2161 if (!ieee80211_is_data(hdr
->frame_control
) ||
2162 is_multicast_ether_addr(hdr
->addr1
) || !sta
|| !lq_sta
) {
2164 info
->control
.rates
[0].idx
=
2165 rate_lowest_index(sband
, NULL
);
2167 info
->control
.rates
[0].idx
=
2168 rate_lowest_index(sband
, sta
);
2172 rate_idx
= lq_sta
->last_txrate_idx
;
2174 if ((priv
->iw_mode
== NL80211_IFTYPE_ADHOC
) &&
2175 !lq_sta
->ibss_sta_added
) {
2176 u8 sta_id
= iwl_find_station(priv
, hdr
->addr1
);
2178 if (sta_id
== IWL_INVALID_STATION
) {
2179 IWL_DEBUG_RATE(priv
, "LQ: ADD station %pM\n",
2181 sta_id
= iwl_add_station_flags(priv
, hdr
->addr1
,
2182 0, CMD_ASYNC
, NULL
);
2184 if ((sta_id
!= IWL_INVALID_STATION
)) {
2185 lq_sta
->lq
.sta_id
= sta_id
;
2186 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2187 lq_sta
->ibss_sta_added
= 1;
2188 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2192 if (rate_idx
< 0 || rate_idx
> IWL_RATE_COUNT
)
2193 rate_idx
= rate_lowest_index(sband
, sta
);
2194 else if (sband
->band
== IEEE80211_BAND_5GHZ
)
2195 rate_idx
-= IWL_FIRST_OFDM_RATE
;
2197 info
->control
.rates
[0].idx
= rate_idx
;
2200 static void *rs_alloc_sta(void *priv_rate
, struct ieee80211_sta
*sta
,
2203 struct iwl_lq_sta
*lq_sta
;
2204 struct iwl_priv
*priv
;
2207 priv
= (struct iwl_priv
*)priv_rate
;
2208 IWL_DEBUG_RATE(priv
, "create station rate scale window\n");
2210 lq_sta
= kzalloc(sizeof(struct iwl_lq_sta
), gfp
);
2214 lq_sta
->lq
.sta_id
= 0xff;
2217 for (j
= 0; j
< LQ_SIZE
; j
++)
2218 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2219 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2224 static void rs_rate_init(void *priv_r
, struct ieee80211_supported_band
*sband
,
2225 struct ieee80211_sta
*sta
, void *priv_sta
)
2228 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
2229 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2230 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2235 lq_sta
->flush_timer
= 0;
2236 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2237 for (j
= 0; j
< LQ_SIZE
; j
++)
2238 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2239 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2241 IWL_DEBUG_RATE(priv
, "LQ: *** rate scale station global init ***\n");
2242 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2243 * the lowest or the highest rate.. Could consider using RSSI from
2244 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2247 lq_sta
->ibss_sta_added
= 0;
2248 if (priv
->iw_mode
== NL80211_IFTYPE_AP
) {
2249 u8 sta_id
= iwl_find_station(priv
, sta
->addr
);
2251 /* for IBSS the call are from tasklet */
2252 IWL_DEBUG_RATE(priv
, "LQ: ADD station %pM\n", sta
->addr
);
2254 if (sta_id
== IWL_INVALID_STATION
) {
2255 IWL_DEBUG_RATE(priv
, "LQ: ADD station %pM\n", sta
->addr
);
2256 sta_id
= iwl_add_station_flags(priv
, sta
->addr
,
2257 0, CMD_ASYNC
, NULL
);
2259 if ((sta_id
!= IWL_INVALID_STATION
)) {
2260 lq_sta
->lq
.sta_id
= sta_id
;
2261 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2263 /* FIXME: this is w/a remove it later */
2264 priv
->assoc_station_added
= 1;
2268 lq_sta
->max_rate_idx
= -1;
2269 lq_sta
->missed_rate_counter
= IWL_MISSED_RATE_MAX
;
2270 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2271 lq_sta
->active_legacy_rate
= priv
->active_rate
& ~(0x1000);
2272 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2273 lq_sta
->band
= priv
->band
;
2275 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2276 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2278 lq_sta
->active_siso_rate
= sta
->ht_cap
.mcs
.rx_mask
[0] << 1;
2279 lq_sta
->active_siso_rate
|= sta
->ht_cap
.mcs
.rx_mask
[0] & 0x1;
2280 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2281 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2284 lq_sta
->active_mimo2_rate
= sta
->ht_cap
.mcs
.rx_mask
[1] << 1;
2285 lq_sta
->active_mimo2_rate
|= sta
->ht_cap
.mcs
.rx_mask
[1] & 0x1;
2286 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2287 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2289 lq_sta
->active_mimo3_rate
= sta
->ht_cap
.mcs
.rx_mask
[2] << 1;
2290 lq_sta
->active_mimo3_rate
|= sta
->ht_cap
.mcs
.rx_mask
[2] & 0x1;
2291 lq_sta
->active_mimo3_rate
&= ~((u16
)0x2);
2292 lq_sta
->active_mimo3_rate
<<= IWL_FIRST_OFDM_RATE
;
2294 IWL_DEBUG_RATE(priv
, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2295 lq_sta
->active_siso_rate
,
2296 lq_sta
->active_mimo2_rate
,
2297 lq_sta
->active_mimo3_rate
);
2299 /* These values will be overridden later */
2300 lq_sta
->lq
.general_params
.single_stream_ant_msk
= ANT_A
;
2301 lq_sta
->lq
.general_params
.dual_stream_ant_msk
= ANT_AB
;
2303 /* as default allow aggregation for all tids */
2304 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2307 /* Find highest tx rate supported by hardware and destination station */
2308 mask_bit
= sta
->supp_rates
[sband
->band
];
2309 count
= sband
->n_bitrates
;
2310 if (sband
->band
== IEEE80211_BAND_5GHZ
) {
2311 count
+= IWL_FIRST_OFDM_RATE
;
2312 start_rate
= IWL_FIRST_OFDM_RATE
;
2313 mask_bit
<<= IWL_FIRST_OFDM_RATE
;
2316 mask_bit
= mask_bit
& lq_sta
->active_legacy_rate
;
2317 lq_sta
->last_txrate_idx
= 4;
2318 for (i
= start_rate
; i
< count
; i
++)
2319 if (mask_bit
& BIT(i
))
2320 lq_sta
->last_txrate_idx
= i
;
2322 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2325 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
2326 struct iwl_lq_sta
*lq_sta
, u32 new_rate
)
2328 struct iwl_scale_tbl_info tbl_type
;
2331 int repeat_rate
= 0;
2332 u8 ant_toggle_cnt
= 0;
2333 u8 use_ht_possible
= 1;
2334 u8 valid_tx_ant
= 0;
2335 struct iwl_link_quality_cmd
*lq_cmd
= &lq_sta
->lq
;
2337 /* Override starting rate (index 0) if needed for debug purposes */
2338 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2340 /* Interpret new_rate (rate_n_flags) */
2341 memset(&tbl_type
, 0, sizeof(tbl_type
));
2342 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
,
2343 &tbl_type
, &rate_idx
);
2345 /* How many times should we repeat the initial rate? */
2346 if (is_legacy(tbl_type
.lq_type
)) {
2348 repeat_rate
= IWL_NUMBER_TRY
;
2350 repeat_rate
= IWL_HT_NUMBER_TRY
;
2353 lq_cmd
->general_params
.mimo_delimiter
=
2354 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2356 /* Fill 1st table entry (index 0) */
2357 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2359 if (num_of_ant(tbl_type
.ant_type
) == 1) {
2360 lq_cmd
->general_params
.single_stream_ant_msk
=
2362 } else if (num_of_ant(tbl_type
.ant_type
) == 2) {
2363 lq_cmd
->general_params
.dual_stream_ant_msk
=
2365 } /* otherwise we don't modify the existing value */
2371 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2373 /* Fill rest of rate table */
2374 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2375 /* Repeat initial/next rate.
2376 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2377 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2378 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2379 if (is_legacy(tbl_type
.lq_type
)) {
2380 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2383 rs_toggle_antenna(valid_tx_ant
,
2384 &new_rate
, &tbl_type
))
2388 /* Override next rate if needed for debug purposes */
2389 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2391 /* Fill next table entry */
2392 lq_cmd
->rs_table
[index
].rate_n_flags
=
2393 cpu_to_le32(new_rate
);
2398 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
, &tbl_type
,
2401 /* Indicate to uCode which entries might be MIMO.
2402 * If initial rate was MIMO, this will finally end up
2403 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2404 if (is_mimo(tbl_type
.lq_type
))
2405 lq_cmd
->general_params
.mimo_delimiter
= index
;
2408 new_rate
= rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2411 /* How many times should we repeat the next rate? */
2412 if (is_legacy(tbl_type
.lq_type
)) {
2413 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2416 rs_toggle_antenna(valid_tx_ant
,
2417 &new_rate
, &tbl_type
))
2420 repeat_rate
= IWL_NUMBER_TRY
;
2422 repeat_rate
= IWL_HT_NUMBER_TRY
;
2425 /* Don't allow HT rates after next pass.
2426 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2427 use_ht_possible
= 0;
2429 /* Override next rate if needed for debug purposes */
2430 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2432 /* Fill next table entry */
2433 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2439 lq_cmd
->agg_params
.agg_frame_cnt_limit
= 64;
2440 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2441 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2444 static void *rs_alloc(struct ieee80211_hw
*hw
, struct dentry
*debugfsdir
)
2448 /* rate scale requires free function to be implemented */
2449 static void rs_free(void *priv_rate
)
2454 static void rs_free_sta(void *priv_r
, struct ieee80211_sta
*sta
,
2457 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2458 struct iwl_priv
*priv __maybe_unused
= priv_r
;
2460 IWL_DEBUG_RATE(priv
, "enter\n");
2462 IWL_DEBUG_RATE(priv
, "leave\n");
2466 #ifdef CONFIG_MAC80211_DEBUGFS
2467 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2469 file
->private_data
= inode
->i_private
;
2472 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
2473 u32
*rate_n_flags
, int index
)
2475 struct iwl_priv
*priv
;
2478 if (lq_sta
->dbg_fixed_rate
) {
2480 *rate_n_flags
= lq_sta
->dbg_fixed_rate
;
2482 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2483 *rate_n_flags
= 0x800D;
2485 *rate_n_flags
= 0x820A;
2487 IWL_DEBUG_RATE(priv
, "Fixed rate ON\n");
2489 IWL_DEBUG_RATE(priv
, "Fixed rate OFF\n");
2493 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2494 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2496 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2497 struct iwl_priv
*priv
;
2503 memset(buf
, 0, sizeof(buf
));
2504 buf_size
= min(count
, sizeof(buf
) - 1);
2505 if (copy_from_user(buf
, user_buf
, buf_size
))
2508 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2509 lq_sta
->dbg_fixed_rate
= parsed_rate
;
2511 lq_sta
->dbg_fixed_rate
= 0;
2513 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2514 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2515 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2516 lq_sta
->active_mimo3_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2518 IWL_DEBUG_RATE(priv
, "sta_id %d rate 0x%X\n",
2519 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed_rate
);
2521 if (lq_sta
->dbg_fixed_rate
) {
2522 rs_fill_link_cmd(NULL
, lq_sta
, lq_sta
->dbg_fixed_rate
);
2523 iwl_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2529 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2530 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2537 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2538 struct iwl_priv
*priv
;
2539 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2542 buff
= kmalloc(1024, GFP_KERNEL
);
2546 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2547 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2548 lq_sta
->total_failed
, lq_sta
->total_success
,
2549 lq_sta
->active_legacy_rate
);
2550 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2551 lq_sta
->dbg_fixed_rate
);
2552 desc
+= sprintf(buff
+desc
, "valid_tx_ant %s%s%s\n",
2553 (priv
->hw_params
.valid_tx_ant
& ANT_A
) ? "ANT_A," : "",
2554 (priv
->hw_params
.valid_tx_ant
& ANT_B
) ? "ANT_B," : "",
2555 (priv
->hw_params
.valid_tx_ant
& ANT_C
) ? "ANT_C" : "");
2556 desc
+= sprintf(buff
+desc
, "lq type %s\n",
2557 (is_legacy(tbl
->lq_type
)) ? "legacy" : "HT");
2558 if (is_Ht(tbl
->lq_type
)) {
2559 desc
+= sprintf(buff
+desc
, " %s",
2560 (is_siso(tbl
->lq_type
)) ? "SISO" :
2561 ((is_mimo2(tbl
->lq_type
)) ? "MIMO2" : "MIMO3"));
2562 desc
+= sprintf(buff
+desc
, " %s",
2563 (tbl
->is_fat
) ? "40MHz" : "20MHz");
2564 desc
+= sprintf(buff
+desc
, " %s\n", (tbl
->is_SGI
) ? "SGI" : "");
2566 desc
+= sprintf(buff
+desc
, "general:"
2567 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2568 lq_sta
->lq
.general_params
.flags
,
2569 lq_sta
->lq
.general_params
.mimo_delimiter
,
2570 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2571 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2573 desc
+= sprintf(buff
+desc
, "agg:"
2574 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2575 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2576 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2577 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2579 desc
+= sprintf(buff
+desc
,
2580 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2581 lq_sta
->lq
.general_params
.start_rate_index
[0],
2582 lq_sta
->lq
.general_params
.start_rate_index
[1],
2583 lq_sta
->lq
.general_params
.start_rate_index
[2],
2584 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2587 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
2588 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X\n",
2589 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2591 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2596 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2597 .write
= rs_sta_dbgfs_scale_table_write
,
2598 .read
= rs_sta_dbgfs_scale_table_read
,
2599 .open
= open_file_generic
,
2601 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2602 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2609 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2611 buff
= kmalloc(1024, GFP_KERNEL
);
2615 for (i
= 0; i
< LQ_SIZE
; i
++) {
2616 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2618 lq_sta
->active_tbl
== i
? "*" : "x",
2619 lq_sta
->lq_info
[i
].lq_type
,
2620 lq_sta
->lq_info
[i
].is_SGI
,
2621 lq_sta
->lq_info
[i
].is_fat
,
2622 lq_sta
->lq_info
[i
].is_dup
,
2623 lq_sta
->lq_info
[i
].current_rate
);
2624 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2625 desc
+= sprintf(buff
+desc
,
2626 "counter=%d success=%d %%=%d\n",
2627 lq_sta
->lq_info
[i
].win
[j
].counter
,
2628 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2629 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2632 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2637 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2638 .read
= rs_sta_dbgfs_stats_table_read
,
2639 .open
= open_file_generic
,
2642 static void rs_add_debugfs(void *priv
, void *priv_sta
,
2645 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2646 lq_sta
->rs_sta_dbgfs_scale_table_file
=
2647 debugfs_create_file("rate_scale_table", 0600, dir
,
2648 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
2649 lq_sta
->rs_sta_dbgfs_stats_table_file
=
2650 debugfs_create_file("rate_stats_table", 0600, dir
,
2651 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
2652 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
2653 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
2654 &lq_sta
->tx_agg_tid_en
);
2658 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
2660 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2661 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
2662 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
2663 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
2667 static struct rate_control_ops rs_ops
= {
2670 .tx_status
= rs_tx_status
,
2671 .get_rate
= rs_get_rate
,
2672 .rate_init
= rs_rate_init
,
2675 .alloc_sta
= rs_alloc_sta
,
2676 .free_sta
= rs_free_sta
,
2677 #ifdef CONFIG_MAC80211_DEBUGFS
2678 .add_sta_debugfs
= rs_add_debugfs
,
2679 .remove_sta_debugfs
= rs_remove_debugfs
,
2683 int iwlagn_rate_control_register(void)
2685 return ieee80211_rate_control_register(&rs_ops
);
2688 void iwlagn_rate_control_unregister(void)
2690 ieee80211_rate_control_unregister(&rs_ops
);