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>
38 #include "../net/mac80211/rate.h"
42 #include "iwl-helpers.h"
44 #define RS_NAME "iwl-4965-rs"
46 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
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
69 } __attribute__ ((packed
));
72 * struct iwl4965_rate_scale_data -- tx success history for one rate
74 struct iwl4965_rate_scale_data
{
75 u64 data
; /* bitmap of successful frames */
76 s32 success_counter
; /* number of frames successful */
77 s32 success_ratio
; /* per-cent * 128 */
78 s32 counter
; /* number of frames attempted */
79 s32 average_tpt
; /* success ratio * expected throughput */
84 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
86 * There are two of these in struct iwl4965_lq_sta,
87 * one for "active", and one for "search".
89 struct iwl4965_scale_tbl_info
{
90 enum iwl_table_type lq_type
;
92 u8 is_SGI
; /* 1 = short guard interval */
93 u8 is_fat
; /* 1 = 40 MHz channel width */
94 u8 is_dup
; /* 1 = duplicated data streams */
95 u8 action
; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
96 s32
*expected_tpt
; /* throughput metrics; expected_tpt_G, etc. */
97 struct iwl4965_rate current_rate
; /* rate_n_flags, uCode API format */
98 struct iwl4965_rate_scale_data win
[IWL_RATE_COUNT
]; /* rate histories */
101 #ifdef CONFIG_IWL4965_HT
103 struct iwl4965_traffic_load
{
104 unsigned long time_stamp
; /* age of the oldest statistics */
105 u32 packet_count
[TID_QUEUE_MAX_SIZE
]; /* packet count in this time
107 u32 total
; /* total num of packets during the
108 * last TID_MAX_TIME_DIFF */
109 u8 queue_count
; /* number of queues that has
110 * been used since the last cleanup */
111 u8 head
; /* start of the circular buffer */
114 #endif /* CONFIG_IWL4965_HT */
117 * struct iwl4965_lq_sta -- driver's rate scaling private structure
119 * Pointer to this gets passed back and forth between driver and mac80211.
121 struct iwl4965_lq_sta
{
122 u8 active_tbl
; /* index of active table, range 0-1 */
123 u8 enable_counter
; /* indicates HT mode */
124 u8 stay_in_tbl
; /* 1: disallow, 0: allow search for new mode */
125 u8 search_better_tbl
; /* 1: currently trying alternate mode */
128 /* The following determine when to search for a new mode */
129 u32 table_count_limit
;
130 u32 max_failure_limit
; /* # failed frames before new search */
131 u32 max_success_limit
; /* # successful frames before new search */
133 u32 total_failed
; /* total failed frames, any/all rates */
134 u32 total_success
; /* total successful frames, any/all rates */
135 u32 flush_timer
; /* time staying in mode before new search */
137 u8 action_counter
; /* # mode-switch actions tried */
142 enum ieee80211_band band
;
145 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
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 iwl4965_scale_tbl_info lq_info
[LQ_SIZE
]; /* "active", "search" */
155 #ifdef CONFIG_IWL4965_HT
156 struct iwl4965_traffic_load load
[TID_MAX_LOAD_COUNT
];
159 #ifdef CONFIG_MAC80211_DEBUGFS
160 struct dentry
*rs_sta_dbgfs_scale_table_file
;
161 struct dentry
*rs_sta_dbgfs_stats_table_file
;
162 #ifdef CONFIG_IWL4965_HT
163 struct dentry
*rs_sta_dbgfs_tx_agg_tid_en_file
;
165 struct iwl4965_rate dbg_fixed
;
166 struct iwl_priv
*drv
;
170 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
171 struct net_device
*dev
,
172 struct ieee80211_hdr
*hdr
,
173 struct sta_info
*sta
);
174 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
175 struct iwl4965_lq_sta
*lq_sta
,
176 struct iwl4965_rate
*tx_mcs
,
177 struct iwl_link_quality_cmd
*tbl
);
180 #ifdef CONFIG_MAC80211_DEBUGFS
181 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
182 struct iwl4965_rate
*mcs
, int index
);
184 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
185 struct iwl4965_rate
*mcs
, 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 spearate 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
iwl4965_rate_get_rate(u32 rate_n_flags
)
237 return (u8
)(rate_n_flags
& 0xFF);
240 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data
*window
)
243 window
->success_counter
= 0;
244 window
->success_ratio
= IWL_INVALID_VALUE
;
246 window
->average_tpt
= IWL_INVALID_VALUE
;
250 #ifdef CONFIG_IWL4965_HT
252 * removes the old data from the statistics. All data that is older than
253 * TID_MAX_TIME_DIFF, will be deleted.
255 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load
*tl
, u32 curr_time
)
257 /* The oldest age we want to keep */
258 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
260 while (tl
->queue_count
&&
261 (tl
->time_stamp
< oldest_time
)) {
262 tl
->total
-= tl
->packet_count
[tl
->head
];
263 tl
->packet_count
[tl
->head
] = 0;
264 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
267 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
273 * increment traffic load value for tid and also remove
274 * any old values if passed the certain time period
276 static void rs_tl_add_packet(struct iwl4965_lq_sta
*lq_data
, u8 tid
)
278 u32 curr_time
= jiffies_to_msecs(jiffies
);
281 struct iwl4965_traffic_load
*tl
= NULL
;
283 if (tid
>= TID_MAX_LOAD_COUNT
)
286 tl
= &lq_data
->load
[tid
];
288 curr_time
-= curr_time
% TID_ROUND_VALUE
;
290 /* Happens only for the first packet. Initialize the data */
291 if (!(tl
->queue_count
)) {
293 tl
->time_stamp
= curr_time
;
296 tl
->packet_count
[0] = 1;
300 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
301 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
303 /* The history is too long: remove data that is older than */
304 /* TID_MAX_TIME_DIFF */
305 if (index
>= TID_QUEUE_MAX_SIZE
)
306 rs_tl_rm_old_stats(tl
, curr_time
);
308 index
= (tl
->head
+ index
) % TID_QUEUE_MAX_SIZE
;
309 tl
->packet_count
[index
] = tl
->packet_count
[index
] + 1;
310 tl
->total
= tl
->total
+ 1;
312 if ((index
+ 1) > tl
->queue_count
)
313 tl
->queue_count
= index
+ 1;
317 get the traffic load value for tid
319 static u32
rs_tl_get_load(struct iwl4965_lq_sta
*lq_data
, u8 tid
)
321 u32 curr_time
= jiffies_to_msecs(jiffies
);
324 struct iwl4965_traffic_load
*tl
= NULL
;
326 if (tid
>= TID_MAX_LOAD_COUNT
)
329 tl
= &(lq_data
->load
[tid
]);
331 curr_time
-= curr_time
% TID_ROUND_VALUE
;
333 if (!(tl
->queue_count
))
336 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
337 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
339 /* The history is too long: remove data that is older than */
340 /* TID_MAX_TIME_DIFF */
341 if (index
>= TID_QUEUE_MAX_SIZE
)
342 rs_tl_rm_old_stats(tl
, curr_time
);
347 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv
*priv
,
348 struct iwl4965_lq_sta
*lq_data
, u8 tid
,
349 struct sta_info
*sta
)
352 DECLARE_MAC_BUF(mac
);
354 spin_lock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
355 state
= sta
->ampdu_mlme
.tid_state_tx
[tid
];
356 spin_unlock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
358 if (state
== HT_AGG_STATE_IDLE
&&
359 rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
360 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
361 print_mac(mac
, sta
->addr
), tid
);
362 ieee80211_start_tx_ba_session(priv
->hw
, sta
->addr
, tid
);
366 static void rs_tl_turn_on_agg(struct iwl_priv
*priv
, u8 tid
,
367 struct iwl4965_lq_sta
*lq_data
,
368 struct sta_info
*sta
)
370 if ((tid
< TID_MAX_LOAD_COUNT
))
371 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
372 else if (tid
== IWL_AGG_ALL_TID
)
373 for (tid
= 0; tid
< TID_MAX_LOAD_COUNT
; tid
++)
374 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
377 #endif /* CONFIG_IWLWIFI_HT */
379 static inline int get_num_of_ant_from_mcs(u32 mcs
)
381 return (!!(mcs
& RATE_MCS_ANT_A_MSK
) +
382 !!(mcs
& RATE_MCS_ANT_B_MSK
) +
383 !!(mcs
& RATE_MCS_ANT_C_MSK
));
387 * rs_collect_tx_data - Update the success/failure sliding window
389 * We keep a sliding window of the last 62 packets transmitted
390 * at this rate. window->data contains the bitmask of successful
393 static int rs_collect_tx_data(struct iwl4965_rate_scale_data
*windows
,
394 int scale_index
, s32 tpt
, int retries
,
397 struct iwl4965_rate_scale_data
*window
= NULL
;
399 u8 win_size
= IWL_RATE_MAX_WINDOW
;
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
>= win_size
) {
418 window
->counter
= win_size
- 1;
420 mask
= (mask
<< (win_size
- 1));
421 if (window
->data
& mask
) {
422 window
->data
&= ~mask
;
423 window
->success_counter
=
424 window
->success_counter
- 1;
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. */
435 window
->data
= (mask
<< 1);
437 window
->success_counter
= window
->success_counter
+ 1;
445 /* Calculate current success ratio, avoid divide-by-0! */
446 if (window
->counter
> 0)
447 window
->success_ratio
= 128 * (100 * window
->success_counter
)
450 window
->success_ratio
= IWL_INVALID_VALUE
;
452 fail_count
= window
->counter
- window
->success_counter
;
454 /* Calculate average throughput, if we have enough history. */
455 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
456 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
457 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
459 window
->average_tpt
= IWL_INVALID_VALUE
;
461 /* Tag this window as having been updated */
462 window
->stamp
= jiffies
;
468 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
470 static void rs_mcs_from_tbl(struct iwl4965_rate
*mcs_rate
,
471 struct iwl4965_scale_tbl_info
*tbl
,
472 int index
, u8 use_green
)
474 if (is_legacy(tbl
->lq_type
)) {
475 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp
;
476 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
477 mcs_rate
->rate_n_flags
|= RATE_MCS_CCK_MSK
;
479 } else if (is_Ht(tbl
->lq_type
)) {
480 if (index
> IWL_LAST_OFDM_RATE
) {
481 IWL_ERROR("invalid HT rate index %d\n", index
);
482 index
= IWL_LAST_OFDM_RATE
;
484 mcs_rate
->rate_n_flags
= RATE_MCS_HT_MSK
;
486 if (is_siso(tbl
->lq_type
))
487 mcs_rate
->rate_n_flags
|=
488 iwl4965_rates
[index
].plcp_siso
;
489 else if (is_mimo2(tbl
->lq_type
))
490 mcs_rate
->rate_n_flags
|=
491 iwl4965_rates
[index
].plcp_mimo2
;
493 mcs_rate
->rate_n_flags
|=
494 iwl4965_rates
[index
].plcp_mimo3
;
496 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl
->lq_type
);
499 mcs_rate
->rate_n_flags
|= ((tbl
->ant_type
<< RATE_MCS_ANT_POS
) &
500 RATE_MCS_ANT_ABC_MSK
);
502 if (is_legacy(tbl
->lq_type
))
507 mcs_rate
->rate_n_flags
|= RATE_MCS_DUP_MSK
;
509 mcs_rate
->rate_n_flags
|= RATE_MCS_FAT_MSK
;
512 mcs_rate
->rate_n_flags
|= RATE_MCS_SGI_MSK
;
515 mcs_rate
->rate_n_flags
|= RATE_MCS_GF_MSK
;
516 if (is_siso(tbl
->lq_type
))
517 mcs_rate
->rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
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 struct iwl4965_rate
*mcs_rate
,
526 enum ieee80211_band band
,
527 struct iwl4965_scale_tbl_info
*tbl
,
530 u32 ant_msk
= (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_ABC_MSK
);
531 u8 num_of_ant
= get_num_of_ant_from_mcs(ant_msk
);
533 *rate_idx
= iwl4965_hwrate_to_plcp_idx(mcs_rate
->rate_n_flags
);
535 if (*rate_idx
== IWL_RATE_INVALID
) {
539 tbl
->is_SGI
= 0; /* default legacy setup */
542 tbl
->ant_type
= (ant_msk
>> RATE_MCS_ANT_POS
);
543 tbl
->lq_type
= LQ_NONE
;
545 /* legacy rate format */
546 if (!(mcs_rate
->rate_n_flags
& RATE_MCS_HT_MSK
)) {
547 if (num_of_ant
== 1) {
548 if (band
== IEEE80211_BAND_5GHZ
)
555 if (mcs_rate
->rate_n_flags
& RATE_MCS_SGI_MSK
)
558 if ((mcs_rate
->rate_n_flags
& RATE_MCS_FAT_MSK
) ||
559 (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
))
562 if (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
)
566 if (iwl4965_rate_get_rate(mcs_rate
->rate_n_flags
)
567 <= IWL_RATE_SISO_60M_PLCP
) {
570 tbl
->lq_type
= LQ_SISO
; /*else NONE*/
572 } else if (iwl4965_rate_get_rate(mcs_rate
->rate_n_flags
)
573 <= IWL_RATE_MIMO2_60M_PLCP
) {
575 tbl
->lq_type
= LQ_MIMO2
;
579 tbl
->lq_type
= LQ_MIMO3
;
584 /* FIXME:RS: need to toggle also ANT_C, and also AB,AC,BC */
585 static inline void rs_toggle_antenna(struct iwl4965_rate
*new_rate
,
586 struct iwl4965_scale_tbl_info
*tbl
)
588 tbl
->ant_type
^= ANT_AB
;
589 new_rate
->rate_n_flags
^= (RATE_MCS_ANT_A_MSK
|RATE_MCS_ANT_B_MSK
);
592 static inline u8
rs_use_green(struct iwl_priv
*priv
,
593 struct ieee80211_conf
*conf
)
595 #ifdef CONFIG_IWL4965_HT
596 return ((conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) &&
597 priv
->current_ht_config
.is_green_field
&&
598 !priv
->current_ht_config
.non_GF_STA_present
);
599 #endif /* CONFIG_IWL4965_HT */
604 * rs_get_supported_rates - get the available rates
606 * if management frame or broadcast frame only return
607 * basic available rates.
610 static void rs_get_supported_rates(struct iwl4965_lq_sta
*lq_sta
,
611 struct ieee80211_hdr
*hdr
,
612 enum iwl_table_type rate_type
,
615 if (is_legacy(rate_type
))
616 *data_rate
= lq_sta
->active_rate
;
618 if (is_siso(rate_type
))
619 *data_rate
= lq_sta
->active_siso_rate
;
620 else if (is_mimo2(rate_type
))
621 *data_rate
= lq_sta
->active_mimo2_rate
;
623 *data_rate
= lq_sta
->active_mimo3_rate
;
626 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
627 lq_sta
->active_rate_basic
) {
628 *data_rate
= lq_sta
->active_rate_basic
;
632 static u16
rs_get_adjacent_rate(u8 index
, u16 rate_mask
, int rate_type
)
634 u8 high
= IWL_RATE_INVALID
;
635 u8 low
= IWL_RATE_INVALID
;
637 /* 802.11A or ht walks to the next literal adjacent rate in
639 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
643 /* Find the previous rate that is in the rate mask */
645 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
646 if (rate_mask
& mask
) {
652 /* Find the next rate that is in the rate mask */
654 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
655 if (rate_mask
& mask
) {
661 return (high
<< 8) | low
;
665 while (low
!= IWL_RATE_INVALID
) {
666 low
= iwl4965_rates
[low
].prev_rs
;
667 if (low
== IWL_RATE_INVALID
)
669 if (rate_mask
& (1 << low
))
671 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low
);
675 while (high
!= IWL_RATE_INVALID
) {
676 high
= iwl4965_rates
[high
].next_rs
;
677 if (high
== IWL_RATE_INVALID
)
679 if (rate_mask
& (1 << high
))
681 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high
);
684 return (high
<< 8) | low
;
687 static void rs_get_lower_rate(struct iwl4965_lq_sta
*lq_sta
,
688 struct iwl4965_scale_tbl_info
*tbl
, u8 scale_index
,
689 u8 ht_possible
, struct iwl4965_rate
*mcs_rate
)
694 u8 switch_to_legacy
= 0;
695 u8 is_green
= lq_sta
->is_green
;
697 /* check if we need to switch from HT to legacy rates.
698 * assumption is that mandatory rates (1Mbps or 6Mbps)
699 * are always supported (spec demand) */
700 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
701 switch_to_legacy
= 1;
702 scale_index
= rs_ht_to_legacy
[scale_index
];
703 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
708 if (num_of_ant(tbl
->ant_type
> 1))
709 tbl
->ant_type
= ANT_A
;/*FIXME:RS*/
715 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
, &rate_mask
);
717 /* Mask with station rate restriction */
718 if (is_legacy(tbl
->lq_type
)) {
719 /* supp_rates has no CCK bits in A mode */
720 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
721 rate_mask
= (u16
)(rate_mask
&
722 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
724 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
727 /* If we switched from HT to legacy, check current rate */
728 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
729 rs_mcs_from_tbl(mcs_rate
, tbl
, scale_index
, is_green
);
733 high_low
= rs_get_adjacent_rate(scale_index
, rate_mask
, tbl
->lq_type
);
734 low
= high_low
& 0xff;
736 if (low
!= IWL_RATE_INVALID
)
737 rs_mcs_from_tbl(mcs_rate
, tbl
, low
, is_green
);
739 rs_mcs_from_tbl(mcs_rate
, tbl
, scale_index
, is_green
);
743 * mac80211 sends us Tx status
745 static void rs_tx_status(void *priv_rate
, struct net_device
*dev
,
747 struct ieee80211_tx_status
*tx_resp
)
751 int rs_index
, index
= 0;
752 struct iwl4965_lq_sta
*lq_sta
;
753 struct iwl_link_quality_cmd
*table
;
754 struct sta_info
*sta
;
755 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
756 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
757 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
758 struct ieee80211_hw
*hw
= local_to_hw(local
);
759 struct iwl4965_rate_scale_data
*window
= NULL
;
760 struct iwl4965_rate_scale_data
*search_win
= NULL
;
761 struct iwl4965_rate tx_mcs
;
762 struct iwl4965_scale_tbl_info tbl_type
;
763 struct iwl4965_scale_tbl_info
*curr_tbl
, *search_tbl
;
765 u16 fc
= le16_to_cpu(hdr
->frame_control
);
768 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
770 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
))
773 /* This packet was aggregated but doesn't carry rate scale info */
774 if ((tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
) &&
775 !(tx_resp
->flags
& IEEE80211_TX_STATUS_AMPDU
))
778 retries
= tx_resp
->retry_count
;
785 sta
= sta_info_get(local
, hdr
->addr1
);
787 if (!sta
|| !sta
->rate_ctrl_priv
)
791 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
793 if (!priv
->lq_mngr
.lq_ready
)
796 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
797 !lq_sta
->ibss_sta_added
)
801 active_index
= lq_sta
->active_tbl
;
803 lq_sta
->antenna
= lq_sta
->valid_antenna
;
805 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
806 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
807 window
= (struct iwl4965_rate_scale_data
*)
809 search_win
= (struct iwl4965_rate_scale_data
*)
810 &(search_tbl
->win
[0]);
813 * Ignore this Tx frame response if its initial rate doesn't match
814 * that of latest Link Quality command. There may be stragglers
815 * from a previous Link Quality command, but we're no longer interested
816 * in those; they're either from the "active" mode while we're trying
817 * to check "search" mode, or a prior "search" mode after we've moved
818 * to a new "search" mode (which might become the new "active" mode).
820 tx_mcs
.rate_n_flags
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
821 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->band
, &tbl_type
, &rs_index
);
822 if (priv
->band
== IEEE80211_BAND_5GHZ
)
823 rs_index
-= IWL_FIRST_OFDM_RATE
;
825 if ((tx_resp
->control
.tx_rate
== NULL
) ||
827 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_SHORT_GI
)) ||
829 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_40_MHZ_WIDTH
)) ||
831 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_DUP_DATA
)) ||
832 (tbl_type
.ant_type
^ tx_resp
->control
.antenna_sel_tx
) ||
833 (!!(tx_mcs
.rate_n_flags
& RATE_MCS_HT_MSK
) ^
834 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_OFDM_HT
)) ||
835 (!!(tx_mcs
.rate_n_flags
& RATE_MCS_GF_MSK
) ^
836 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_GREEN_FIELD
)) ||
837 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
838 tx_resp
->control
.tx_rate
->bitrate
)) {
839 IWL_DEBUG_RATE("initial rate does not match 0x%x\n",
840 tx_mcs
.rate_n_flags
);
844 /* Update frame history window with "failure" for each Tx retry. */
846 /* Look up the rate and other info used for each tx attempt.
847 * Each tx attempt steps one entry deeper in the rate table. */
848 tx_mcs
.rate_n_flags
=
849 le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
850 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->band
,
851 &tbl_type
, &rs_index
);
853 /* If type matches "search" table,
854 * add failure to "search" history */
855 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
856 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
857 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
858 if (search_tbl
->expected_tpt
)
859 tpt
= search_tbl
->expected_tpt
[rs_index
];
862 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
864 /* Else if type matches "current/active" table,
865 * add failure to "current/active" history */
866 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
867 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
868 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
869 if (curr_tbl
->expected_tpt
)
870 tpt
= curr_tbl
->expected_tpt
[rs_index
];
873 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
876 /* If not searching for a new mode, increment failed counter
877 * ... this helps determine when to start searching again */
878 if (lq_sta
->stay_in_tbl
)
879 lq_sta
->total_failed
++;
886 * Find (by rate) the history window to update with final Tx attempt;
887 * if Tx was successful first try, use original rate,
888 * else look up the rate that was, finally, successful.
890 tx_mcs
.rate_n_flags
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
891 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->band
, &tbl_type
, &rs_index
);
893 /* Update frame history window with "success" if Tx got ACKed ... */
894 if (tx_resp
->flags
& IEEE80211_TX_STATUS_ACK
)
899 /* If type matches "search" table,
900 * add final tx status to "search" history */
901 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
902 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
903 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
904 if (search_tbl
->expected_tpt
)
905 tpt
= search_tbl
->expected_tpt
[rs_index
];
908 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
)
909 rs_collect_tx_data(search_win
, rs_index
, tpt
,
910 tx_resp
->ampdu_ack_len
,
911 tx_resp
->ampdu_ack_map
);
913 rs_collect_tx_data(search_win
, rs_index
, tpt
,
915 /* Else if type matches "current/active" table,
916 * add final tx status to "current/active" history */
917 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
918 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
919 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
920 if (curr_tbl
->expected_tpt
)
921 tpt
= curr_tbl
->expected_tpt
[rs_index
];
924 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
)
925 rs_collect_tx_data(window
, rs_index
, tpt
,
926 tx_resp
->ampdu_ack_len
,
927 tx_resp
->ampdu_ack_map
);
929 rs_collect_tx_data(window
, rs_index
, tpt
,
933 /* If not searching for new mode, increment success/failed counter
934 * ... these help determine when to start searching again */
935 if (lq_sta
->stay_in_tbl
) {
936 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
) {
937 lq_sta
->total_success
+= tx_resp
->ampdu_ack_map
;
938 lq_sta
->total_failed
+=
939 (tx_resp
->ampdu_ack_len
- tx_resp
->ampdu_ack_map
);
942 lq_sta
->total_success
++;
944 lq_sta
->total_failed
++;
948 /* See if there's a better rate or modulation mode to try. */
949 rs_rate_scale_perform(priv
, dev
, hdr
, sta
);
955 static inline u8
rs_is_ant_connected(u8 valid_antenna
, u8 ant_type
)
957 return ((ant_type
& valid_antenna
) == ant_type
);
960 /*FIXME:RS: this function should be replaced*/
961 static u8
rs_is_other_ant_connected(u8 valid_antenna
, u8 ant_type
)
963 if (ant_type
== ANT_B
)
964 return rs_is_ant_connected(valid_antenna
, ANT_A
);
966 return rs_is_ant_connected(valid_antenna
, ANT_B
);
972 * Begin a period of staying with a selected modulation mode.
973 * Set "stay_in_tbl" flag to prevent any mode switches.
974 * Set frame tx success limits according to legacy vs. high-throughput,
975 * and reset overall (spanning all rates) tx success history statistics.
976 * These control how long we stay using same modulation mode before
977 * searching for a new mode.
979 static void rs_set_stay_in_table(u8 is_legacy
,
980 struct iwl4965_lq_sta
*lq_sta
)
982 IWL_DEBUG_HT("we are staying in the same table\n");
983 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
985 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
986 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
987 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
989 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
990 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
991 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
993 lq_sta
->table_count
= 0;
994 lq_sta
->total_failed
= 0;
995 lq_sta
->total_success
= 0;
999 * Find correct throughput table for given mode of modulation
1001 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta
*lq_sta
,
1002 struct iwl4965_scale_tbl_info
*tbl
)
1004 if (is_legacy(tbl
->lq_type
)) {
1005 if (!is_a_band(tbl
->lq_type
))
1006 tbl
->expected_tpt
= expected_tpt_G
;
1008 tbl
->expected_tpt
= expected_tpt_A
;
1009 } else if (is_siso(tbl
->lq_type
)) {
1010 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1012 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
1014 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
1015 else if (tbl
->is_SGI
)
1016 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
1018 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1020 } else if (is_mimo(tbl
->lq_type
)) { /* FIXME:need to separate mimo2/3 */
1021 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1023 tbl
->expected_tpt
= expected_tpt_mimo40MHzSGI
;
1025 tbl
->expected_tpt
= expected_tpt_mimo40MHz
;
1026 else if (tbl
->is_SGI
)
1027 tbl
->expected_tpt
= expected_tpt_mimo20MHzSGI
;
1029 tbl
->expected_tpt
= expected_tpt_mimo20MHz
;
1031 tbl
->expected_tpt
= expected_tpt_G
;
1034 #ifdef CONFIG_IWL4965_HT
1036 * Find starting rate for new "search" high-throughput mode of modulation.
1037 * Goal is to find lowest expected rate (under perfect conditions) that is
1038 * above the current measured throughput of "active" mode, to give new mode
1039 * a fair chance to prove itself without too many challenges.
1041 * This gets called when transitioning to more aggressive modulation
1042 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1043 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1044 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1045 * bit rate will typically need to increase, but not if performance was bad.
1047 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1048 struct iwl4965_lq_sta
*lq_sta
,
1049 struct iwl4965_scale_tbl_info
*tbl
, /* "search" */
1050 u16 rate_mask
, s8 index
, s8 rate
)
1052 /* "active" values */
1053 struct iwl4965_scale_tbl_info
*active_tbl
=
1054 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1055 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1056 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1058 /* expected "search" throughput */
1059 s32
*tpt_tbl
= tbl
->expected_tpt
;
1061 s32 new_rate
, high
, low
, start_hi
;
1064 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1067 high_low
= rs_get_adjacent_rate(rate
, rate_mask
, tbl
->lq_type
);
1069 low
= high_low
& 0xff;
1070 high
= (high_low
>> 8) & 0xff;
1073 * Lower the "search" bit rate, to give new "search" mode
1074 * approximately the same throughput as "active" if:
1076 * 1) "Active" mode has been working modestly well (but not
1077 * great), and expected "search" throughput (under perfect
1078 * conditions) at candidate rate is above the actual
1079 * measured "active" throughput (but less than expected
1080 * "active" throughput under perfect conditions).
1082 * 2) "Active" mode has been working perfectly or very well
1083 * and expected "search" throughput (under perfect
1084 * conditions) at candidate rate is above expected
1085 * "active" throughput (under perfect conditions).
1087 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1088 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1089 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1090 (tpt_tbl
[rate
] <= active_tpt
))) ||
1091 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1092 (tpt_tbl
[rate
] > active_tpt
))) {
1094 /* (2nd or later pass)
1095 * If we've already tried to raise the rate, and are
1096 * now trying to lower it, use the higher rate. */
1097 if (start_hi
!= IWL_RATE_INVALID
) {
1098 new_rate
= start_hi
;
1104 /* Loop again with lower rate */
1105 if (low
!= IWL_RATE_INVALID
)
1108 /* Lower rate not available, use the original */
1112 /* Else try to raise the "search" rate to match "active" */
1114 /* (2nd or later pass)
1115 * If we've already tried to lower the rate, and are
1116 * now trying to raise it, use the lower rate. */
1117 if (new_rate
!= IWL_RATE_INVALID
)
1120 /* Loop again with higher rate */
1121 else if (high
!= IWL_RATE_INVALID
) {
1125 /* Higher rate not available, use the original */
1135 #endif /* CONFIG_IWL4965_HT */
1137 /*FIXME:RS:this function should be replaced*/
1138 static inline u8
rs_is_both_ant_supp(u8 valid_antenna
)
1140 return (rs_is_ant_connected(valid_antenna
, ANT_AB
));
1144 * Set up search table for MIMO
1146 #ifdef CONFIG_IWL4965_HT
1147 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1148 struct iwl4965_lq_sta
*lq_sta
,
1149 struct ieee80211_conf
*conf
,
1150 struct sta_info
*sta
,
1151 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1155 s8 is_green
= lq_sta
->is_green
;
1157 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1158 !sta
->ht_info
.ht_supported
)
1161 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1162 tbl
->lq_type
= LQ_MIMO2
;
1163 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
,
1166 if (priv
->current_ht_config
.tx_mimo_ps_mode
== IWL_MIMO_PS_STATIC
)
1169 /* Need both Tx chains/antennas to support MIMO */
1170 if (!rs_is_both_ant_supp(priv
->hw_params
.valid_tx_ant
))
1173 tbl
->is_dup
= lq_sta
->is_dup
;
1175 if (priv
->current_ht_config
.supported_chan_width
1176 == IWL_CHANNEL_WIDTH_40MHZ
)
1182 if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_40MHZ_ONLY
)
1186 } else if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_20MHZ_ONLY
)
1191 rs_get_expected_tpt_table(lq_sta
, tbl
);
1193 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
, index
);
1195 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate
, rate_mask
);
1196 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
))
1198 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, rate
, is_green
);
1200 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1201 tbl
->current_rate
.rate_n_flags
, is_green
);
1205 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1206 struct iwl4965_lq_sta
*lq_sta
,
1207 struct ieee80211_conf
*conf
,
1208 struct sta_info
*sta
,
1209 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1213 #endif /*CONFIG_IWL4965_HT */
1216 * Set up search table for SISO
1218 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1219 struct iwl4965_lq_sta
*lq_sta
,
1220 struct ieee80211_conf
*conf
,
1221 struct sta_info
*sta
,
1222 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1224 #ifdef CONFIG_IWL4965_HT
1226 u8 is_green
= lq_sta
->is_green
;
1229 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1230 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1231 !sta
->ht_info
.ht_supported
)
1234 tbl
->is_dup
= lq_sta
->is_dup
;
1235 tbl
->lq_type
= LQ_SISO
;
1237 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
,
1240 if (priv
->current_ht_config
.supported_chan_width
1241 == IWL_CHANNEL_WIDTH_40MHZ
)
1247 if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_40MHZ_ONLY
)
1251 } else if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_20MHZ_ONLY
)
1259 rs_get_expected_tpt_table(lq_sta
, tbl
);
1260 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
, index
);
1262 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1263 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1264 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1268 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, rate
, is_green
);
1269 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1270 tbl
->current_rate
.rate_n_flags
, is_green
);
1275 #endif /*CONFIG_IWL4965_HT */
1279 * Try to switch to new modulation mode from legacy
1281 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1282 struct iwl4965_lq_sta
*lq_sta
,
1283 struct ieee80211_conf
*conf
,
1284 struct sta_info
*sta
,
1287 struct iwl4965_scale_tbl_info
*tbl
=
1288 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1289 struct iwl4965_scale_tbl_info
*search_tbl
=
1290 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1291 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1292 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1293 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1294 u8 start_action
= tbl
->action
;
1295 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1299 switch (tbl
->action
) {
1300 case IWL_LEGACY_SWITCH_ANTENNA
:
1301 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1303 search_tbl
->lq_type
= LQ_NONE
;
1304 lq_sta
->action_counter
++;
1306 /* Don't change antenna if success has been great */
1307 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1310 /* Don't change antenna if other one is not connected */
1311 if (!rs_is_other_ant_connected(valid_tx_ant
,
1315 /* Set up search table to try other antenna */
1316 memcpy(search_tbl
, tbl
, sz
);
1318 rs_toggle_antenna(&(search_tbl
->current_rate
),
1320 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1321 lq_sta
->search_better_tbl
= 1;
1324 case IWL_LEGACY_SWITCH_SISO
:
1325 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1327 /* Set up search table to try SISO */
1328 memcpy(search_tbl
, tbl
, sz
);
1329 search_tbl
->lq_type
= LQ_SISO
;
1330 search_tbl
->is_SGI
= 0;
1331 search_tbl
->is_fat
= 0;
1332 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1335 lq_sta
->search_better_tbl
= 1;
1336 lq_sta
->action_counter
= 0;
1341 case IWL_LEGACY_SWITCH_MIMO2
:
1342 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1344 /* Set up search table to try MIMO */
1345 memcpy(search_tbl
, tbl
, sz
);
1346 search_tbl
->lq_type
= LQ_MIMO2
;
1347 search_tbl
->is_SGI
= 0;
1348 search_tbl
->is_fat
= 0;
1349 search_tbl
->ant_type
= ANT_AB
;/*FIXME:RS*/
1350 /*FIXME:RS:need to check ant validity*/
1351 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1354 lq_sta
->search_better_tbl
= 1;
1355 lq_sta
->action_counter
= 0;
1361 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2
)
1362 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1364 if (tbl
->action
== start_action
)
1372 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2
)
1373 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1379 * Try to switch to new modulation mode from SISO
1381 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1382 struct iwl4965_lq_sta
*lq_sta
,
1383 struct ieee80211_conf
*conf
,
1384 struct sta_info
*sta
,
1387 u8 is_green
= lq_sta
->is_green
;
1388 struct iwl4965_scale_tbl_info
*tbl
=
1389 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1390 struct iwl4965_scale_tbl_info
*search_tbl
=
1391 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1392 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1393 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1394 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1395 u8 start_action
= tbl
->action
;
1396 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1400 lq_sta
->action_counter
++;
1401 switch (tbl
->action
) {
1402 case IWL_SISO_SWITCH_ANTENNA
:
1403 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1404 search_tbl
->lq_type
= LQ_NONE
;
1405 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1407 if (!rs_is_other_ant_connected(valid_tx_ant
,
1411 memcpy(search_tbl
, tbl
, sz
);
1412 search_tbl
->action
= IWL_SISO_SWITCH_MIMO2
;
1413 rs_toggle_antenna(&(search_tbl
->current_rate
),
1415 lq_sta
->search_better_tbl
= 1;
1419 case IWL_SISO_SWITCH_MIMO2
:
1420 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO2 FROM SISO\n");
1421 memcpy(search_tbl
, tbl
, sz
);
1422 search_tbl
->lq_type
= LQ_MIMO2
;
1423 search_tbl
->is_SGI
= 0;
1424 search_tbl
->is_fat
= 0;
1425 search_tbl
->ant_type
= ANT_AB
; /*FIXME:RS*/
1426 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1429 lq_sta
->search_better_tbl
= 1;
1433 case IWL_SISO_SWITCH_GI
:
1434 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1436 memcpy(search_tbl
, tbl
, sz
);
1437 search_tbl
->action
= 0;
1438 if (search_tbl
->is_SGI
)
1439 search_tbl
->is_SGI
= 0;
1441 search_tbl
->is_SGI
= 1;
1444 lq_sta
->search_better_tbl
= 1;
1445 if ((tbl
->lq_type
== LQ_SISO
) &&
1447 s32 tpt
= lq_sta
->last_tpt
/ 100;
1448 if (((!tbl
->is_fat
) &&
1449 (tpt
>= expected_tpt_siso20MHz
[index
])) ||
1451 (tpt
>= expected_tpt_siso40MHz
[index
])))
1452 lq_sta
->search_better_tbl
= 0;
1454 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1455 rs_mcs_from_tbl(&search_tbl
->current_rate
,
1456 search_tbl
, index
, is_green
);
1460 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1461 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1463 if (tbl
->action
== start_action
)
1470 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1471 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1476 * Try to switch to new modulation mode from MIMO
1478 static int rs_move_mimo_to_other(struct iwl_priv
*priv
,
1479 struct iwl4965_lq_sta
*lq_sta
,
1480 struct ieee80211_conf
*conf
,
1481 struct sta_info
*sta
,
1485 s8 is_green
= lq_sta
->is_green
;
1486 struct iwl4965_scale_tbl_info
*tbl
=
1487 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1488 struct iwl4965_scale_tbl_info
*search_tbl
=
1489 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1490 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1491 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1492 u8 start_action
= tbl
->action
;
1495 lq_sta
->action_counter
++;
1496 switch (tbl
->action
) {
1497 case IWL_MIMO_SWITCH_ANTENNA_A
:
1498 case IWL_MIMO_SWITCH_ANTENNA_B
:
1499 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1502 /* Set up new search table for SISO */
1503 memcpy(search_tbl
, tbl
, sz
);
1504 search_tbl
->lq_type
= LQ_SISO
;
1505 search_tbl
->is_SGI
= 0;
1506 search_tbl
->is_fat
= 0;
1507 /*FIXME:RS:need to check ant validity + C*/
1508 if (tbl
->action
== IWL_MIMO_SWITCH_ANTENNA_A
)
1509 search_tbl
->ant_type
= ANT_A
;
1511 search_tbl
->ant_type
= ANT_B
;
1513 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1516 lq_sta
->search_better_tbl
= 1;
1521 case IWL_MIMO_SWITCH_GI
:
1522 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1524 /* Set up new search table for MIMO */
1525 memcpy(search_tbl
, tbl
, sz
);
1526 search_tbl
->action
= 0;
1527 if (search_tbl
->is_SGI
)
1528 search_tbl
->is_SGI
= 0;
1530 search_tbl
->is_SGI
= 1;
1531 lq_sta
->search_better_tbl
= 1;
1534 * If active table already uses the fastest possible
1535 * modulation (dual stream with short guard interval),
1536 * and it's working well, there's no need to look
1537 * for a better type of modulation!
1539 if ((tbl
->lq_type
== LQ_MIMO2
) &&
1541 s32 tpt
= lq_sta
->last_tpt
/ 100;
1542 if (((!tbl
->is_fat
) &&
1543 (tpt
>= expected_tpt_mimo20MHz
[index
])) ||
1545 (tpt
>= expected_tpt_mimo40MHz
[index
])))
1546 lq_sta
->search_better_tbl
= 0;
1548 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1549 rs_mcs_from_tbl(&search_tbl
->current_rate
,
1550 search_tbl
, index
, is_green
);
1555 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1556 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1558 if (tbl
->action
== start_action
)
1565 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1566 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1572 * Check whether we should continue using same modulation mode, or
1573 * begin search for a new mode, based on:
1574 * 1) # tx successes or failures while using this mode
1575 * 2) # times calling this function
1576 * 3) elapsed time in this mode (not used, for now)
1578 static void rs_stay_in_table(struct iwl4965_lq_sta
*lq_sta
)
1580 struct iwl4965_scale_tbl_info
*tbl
;
1583 int flush_interval_passed
= 0;
1585 active_tbl
= lq_sta
->active_tbl
;
1587 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1589 /* If we've been disallowing search, see if we should now allow it */
1590 if (lq_sta
->stay_in_tbl
) {
1592 /* Elapsed time using current modulation mode */
1593 if (lq_sta
->flush_timer
)
1594 flush_interval_passed
=
1596 (unsigned long)(lq_sta
->flush_timer
+
1597 IWL_RATE_SCALE_FLUSH_INTVL
));
1599 /* For now, disable the elapsed time criterion */
1600 flush_interval_passed
= 0;
1603 * Check if we should allow search for new modulation mode.
1604 * If many frames have failed or succeeded, or we've used
1605 * this same modulation for a long time, allow search, and
1606 * reset history stats that keep track of whether we should
1607 * allow a new search. Also (below) reset all bitmaps and
1608 * stats in active history.
1610 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1611 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1612 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1613 && (flush_interval_passed
))) {
1614 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1615 lq_sta
->total_failed
,
1616 lq_sta
->total_success
,
1617 flush_interval_passed
);
1619 /* Allow search for new mode */
1620 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1621 lq_sta
->total_failed
= 0;
1622 lq_sta
->total_success
= 0;
1623 lq_sta
->flush_timer
= 0;
1626 * Else if we've used this modulation mode enough repetitions
1627 * (regardless of elapsed time or success/failure), reset
1628 * history bitmaps and rate-specific stats for all rates in
1632 lq_sta
->table_count
++;
1633 if (lq_sta
->table_count
>=
1634 lq_sta
->table_count_limit
) {
1635 lq_sta
->table_count
= 0;
1637 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1638 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1639 rs_rate_scale_clear_window(
1644 /* If transitioning to allow "search", reset all history
1645 * bitmaps and stats in active table (this will become the new
1646 * "search" table). */
1647 if (!lq_sta
->stay_in_tbl
) {
1648 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1649 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1655 * Do rate scaling and search for new modulation mode.
1657 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
1658 struct net_device
*dev
,
1659 struct ieee80211_hdr
*hdr
,
1660 struct sta_info
*sta
)
1662 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1663 struct ieee80211_hw
*hw
= local_to_hw(local
);
1664 struct ieee80211_conf
*conf
= &hw
->conf
;
1665 int low
= IWL_RATE_INVALID
;
1666 int high
= IWL_RATE_INVALID
;
1669 struct iwl4965_rate_scale_data
*window
= NULL
;
1670 int current_tpt
= IWL_INVALID_VALUE
;
1671 int low_tpt
= IWL_INVALID_VALUE
;
1672 int high_tpt
= IWL_INVALID_VALUE
;
1674 s8 scale_action
= 0;
1677 struct iwl4965_lq_sta
*lq_sta
;
1678 struct iwl4965_scale_tbl_info
*tbl
, *tbl1
;
1679 u16 rate_scale_index_msk
= 0;
1680 struct iwl4965_rate mcs_rate
;
1685 #ifdef CONFIG_IWL4965_HT
1686 u8 tid
= MAX_TID_COUNT
;
1690 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1692 fc
= le16_to_cpu(hdr
->frame_control
);
1693 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
)) {
1694 /* Send management frames and broadcast/multicast data using
1696 /* TODO: this could probably be improved.. */
1700 if (!sta
|| !sta
->rate_ctrl_priv
)
1703 if (!priv
->lq_mngr
.lq_ready
) {
1704 IWL_DEBUG_RATE("still rate scaling not ready\n");
1707 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
1709 #ifdef CONFIG_IWL4965_HT
1710 qc
= ieee80211_get_qos_ctrl(hdr
);
1712 tid
= (u8
)(le16_to_cpu(*qc
) & 0xf);
1713 rs_tl_add_packet(lq_sta
, tid
);
1717 * Select rate-scale / modulation-mode table to work with in
1718 * the rest of this function: "search" if searching for better
1719 * modulation mode, or "active" if doing rate scaling within a mode.
1721 if (!lq_sta
->search_better_tbl
)
1722 active_tbl
= lq_sta
->active_tbl
;
1724 active_tbl
= 1 - lq_sta
->active_tbl
;
1726 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1727 is_green
= lq_sta
->is_green
;
1729 /* current tx rate */
1730 index
= sta
->last_txrate_idx
;
1732 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index
,
1735 /* rates available for this association, and for modulation mode */
1736 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 current rate is no longer supported on current association,
1758 * or user changed preferences for rates, find a new supported rate. */
1759 if (index
< 0 || !((1 << index
) & rate_scale_index_msk
)) {
1760 index
= IWL_INVALID_VALUE
;
1763 /* get the highest available rate */
1764 for (i
= 0; i
<= IWL_RATE_COUNT
; i
++) {
1765 if ((1 << i
) & rate_scale_index_msk
)
1769 if (index
== IWL_INVALID_VALUE
) {
1770 IWL_WARNING("Can not find a suitable rate\n");
1775 /* Get expected throughput table and history window for current rate */
1776 if (!tbl
->expected_tpt
)
1777 rs_get_expected_tpt_table(lq_sta
, tbl
);
1779 window
= &(tbl
->win
[index
]);
1782 * If there is not enough history to calculate actual average
1783 * throughput, keep analyzing results of more tx frames, without
1784 * changing rate or mode (bypass most of the rest of this function).
1785 * Set up new rate table in uCode only if old rate is not supported
1786 * in current association (use new rate found above).
1788 fail_count
= window
->counter
- window
->success_counter
;
1789 if (((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
1790 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
))
1791 || (tbl
->expected_tpt
== NULL
)) {
1792 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1794 window
->success_counter
, window
->counter
, index
);
1796 /* Can't calculate this yet; not enough history */
1797 window
->average_tpt
= IWL_INVALID_VALUE
;
1799 /* Should we stay with this modulation mode,
1800 * or search for a new one? */
1801 rs_stay_in_table(lq_sta
);
1803 /* Set up new rate table in uCode, if needed */
1805 rs_mcs_from_tbl(&mcs_rate
, tbl
, index
, is_green
);
1806 rs_fill_link_cmd(priv
, lq_sta
, &mcs_rate
, &lq_sta
->lq
);
1807 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1811 /* Else we have enough samples; calculate estimate of
1812 * actual average throughput */
1814 window
->average_tpt
= ((window
->success_ratio
*
1815 tbl
->expected_tpt
[index
] + 64) / 128);
1817 /* If we are searching for better modulation mode, check success. */
1818 if (lq_sta
->search_better_tbl
) {
1819 int success_limit
= IWL_RATE_SCALE_SWITCH
;
1821 /* If good success, continue using the "search" mode;
1822 * no need to send new link quality command, since we're
1823 * continuing to use the setup that we've been trying. */
1824 if ((window
->success_ratio
> success_limit
) ||
1825 (window
->average_tpt
> lq_sta
->last_tpt
)) {
1826 if (!is_legacy(tbl
->lq_type
)) {
1827 IWL_DEBUG_HT("LQ: we are switching to HT"
1828 " rate suc %d current tpt %d"
1830 window
->success_ratio
,
1831 window
->average_tpt
,
1833 lq_sta
->enable_counter
= 1;
1835 /* Swap tables; "search" becomes "active" */
1836 lq_sta
->active_tbl
= active_tbl
;
1837 current_tpt
= window
->average_tpt
;
1839 /* Else poor success; go back to mode in "active" table */
1841 /* Nullify "search" table */
1842 tbl
->lq_type
= LQ_NONE
;
1844 /* Revert to "active" table */
1845 active_tbl
= lq_sta
->active_tbl
;
1846 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1848 /* Revert to "active" rate and throughput info */
1849 index
= iwl4965_hwrate_to_plcp_idx(
1850 tbl
->current_rate
.rate_n_flags
);
1851 current_tpt
= lq_sta
->last_tpt
;
1853 /* Need to set up a new rate table in uCode */
1855 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1858 /* Either way, we've made a decision; modulation mode
1859 * search is done, allow rate adjustment next time. */
1860 lq_sta
->search_better_tbl
= 0;
1861 done_search
= 1; /* Don't switch modes below! */
1865 /* (Else) not in search of better modulation mode, try for better
1866 * starting rate, while staying in this mode. */
1867 high_low
= rs_get_adjacent_rate(index
, rate_scale_index_msk
,
1869 low
= high_low
& 0xff;
1870 high
= (high_low
>> 8) & 0xff;
1872 /* Collect measured throughputs for current and adjacent rates */
1873 current_tpt
= window
->average_tpt
;
1874 if (low
!= IWL_RATE_INVALID
)
1875 low_tpt
= tbl
->win
[low
].average_tpt
;
1876 if (high
!= IWL_RATE_INVALID
)
1877 high_tpt
= tbl
->win
[high
].average_tpt
;
1879 /* Assume rate increase */
1882 /* Too many failures, decrease rate */
1883 if ((window
->success_ratio
<= IWL_RATE_DECREASE_TH
) ||
1884 (current_tpt
== 0)) {
1885 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1888 /* No throughput measured yet for adjacent rates; try increase. */
1889 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
1890 (high_tpt
== IWL_INVALID_VALUE
))
1893 /* Both adjacent throughputs are measured, but neither one has better
1894 * throughput; we're using the best rate, don't change it! */
1895 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1896 (high_tpt
!= IWL_INVALID_VALUE
) &&
1897 (low_tpt
< current_tpt
) &&
1898 (high_tpt
< current_tpt
))
1901 /* At least one adjacent rate's throughput is measured,
1902 * and may have better performance. */
1904 /* Higher adjacent rate's throughput is measured */
1905 if (high_tpt
!= IWL_INVALID_VALUE
) {
1906 /* Higher rate has better throughput */
1907 if (high_tpt
> current_tpt
)
1911 ("decrease rate because of high tpt\n");
1915 /* Lower adjacent rate's throughput is measured */
1916 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
1917 /* Lower rate has better throughput */
1918 if (low_tpt
> current_tpt
) {
1920 ("decrease rate because of low tpt\n");
1927 /* Sanity check; asked for decrease, but success rate or throughput
1928 * has been good at old rate. Don't change it. */
1929 if (scale_action
== -1) {
1930 if ((low
!= IWL_RATE_INVALID
) &&
1931 ((window
->success_ratio
> IWL_RATE_HIGH_TH
) ||
1932 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
1935 /* Sanity check; asked for increase, but success rate has not been great
1936 * even at old rate, higher rate will be worse. Don't change it. */
1937 } else if ((scale_action
== 1) &&
1938 (window
->success_ratio
< IWL_RATE_INCREASE_TH
))
1941 switch (scale_action
) {
1943 /* Decrease starting rate, update uCode's rate table */
1944 if (low
!= IWL_RATE_INVALID
) {
1950 /* Increase starting rate, update uCode's rate table */
1951 if (high
!= IWL_RATE_INVALID
) {
1963 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1964 "high %d type %d\n",
1965 index
, scale_action
, low
, high
, tbl
->lq_type
);
1968 /* Replace uCode's rate table for the destination station. */
1970 rs_mcs_from_tbl(&mcs_rate
, tbl
, index
, is_green
);
1971 rs_fill_link_cmd(priv
, lq_sta
, &mcs_rate
, &lq_sta
->lq
);
1972 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1975 /* Should we stay with this modulation mode, or search for a new one? */
1976 rs_stay_in_table(lq_sta
);
1979 * Search for new modulation mode if we're:
1980 * 1) Not changing rates right now
1981 * 2) Not just finishing up a search
1982 * 3) Allowing a new search
1984 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
) {
1985 /* Save current throughput to compare with "search" throughput*/
1986 lq_sta
->last_tpt
= current_tpt
;
1988 /* Select a new "search" modulation mode to try.
1989 * If one is found, set up the new "search" table. */
1990 if (is_legacy(tbl
->lq_type
))
1991 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
1992 else if (is_siso(tbl
->lq_type
))
1993 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
1995 rs_move_mimo_to_other(priv
, lq_sta
, conf
, sta
, index
);
1997 /* If new "search" mode was selected, set up in uCode table */
1998 if (lq_sta
->search_better_tbl
) {
1999 /* Access the "search" table, clear its history. */
2000 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2001 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2002 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2004 /* Use new "search" start rate */
2005 index
= iwl4965_hwrate_to_plcp_idx(
2006 tbl
->current_rate
.rate_n_flags
);
2008 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
2009 tbl
->current_rate
.rate_n_flags
, index
);
2010 rs_fill_link_cmd(priv
, lq_sta
, &tbl
->current_rate
,
2012 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2015 /* If the "active" (non-search) mode was legacy,
2016 * and we've tried switching antennas,
2017 * but we haven't been able to try HT modes (not available),
2018 * stay with best antenna legacy modulation for a while
2019 * before next round of mode comparisons. */
2020 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2021 if (is_legacy(tbl1
->lq_type
) &&
2022 #ifdef CONFIG_IWL4965_HT
2023 (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
)) &&
2025 (lq_sta
->action_counter
>= 1)) {
2026 lq_sta
->action_counter
= 0;
2027 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
2028 rs_set_stay_in_table(1, lq_sta
);
2031 /* If we're in an HT mode, and all 3 mode switch actions
2032 * have been tried and compared, stay in this best modulation
2033 * mode for a while before next round of mode comparisons. */
2034 if (lq_sta
->enable_counter
&&
2035 (lq_sta
->action_counter
>= IWL_ACTION_LIMIT
)) {
2036 #ifdef CONFIG_IWL4965_HT
2037 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2038 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2039 (tid
!= MAX_TID_COUNT
)) {
2040 IWL_DEBUG_HT("try to aggregate tid %d\n", tid
);
2041 rs_tl_turn_on_agg(priv
, tid
, lq_sta
, sta
);
2043 #endif /*CONFIG_IWL4965_HT */
2044 lq_sta
->action_counter
= 0;
2045 rs_set_stay_in_table(0, lq_sta
);
2049 * Else, don't search for a new modulation mode.
2050 * Put new timestamp in stay-in-modulation-mode flush timer if:
2051 * 1) Not changing rates right now
2052 * 2) Not just finishing up a search
2053 * 3) flush timer is empty
2056 if ((!update_lq
) && (!done_search
) && (!lq_sta
->flush_timer
))
2057 lq_sta
->flush_timer
= jiffies
;
2061 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, index
, is_green
);
2063 sta
->last_txrate_idx
= i
;
2065 /* sta->txrate_idx is an index to A mode rates which start
2066 * at IWL_FIRST_OFDM_RATE
2068 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2069 sta
->txrate_idx
= i
- IWL_FIRST_OFDM_RATE
;
2071 sta
->txrate_idx
= i
;
2077 static void rs_initialize_lq(struct iwl_priv
*priv
,
2078 struct ieee80211_conf
*conf
,
2079 struct sta_info
*sta
)
2082 struct iwl4965_lq_sta
*lq_sta
;
2083 struct iwl4965_scale_tbl_info
*tbl
;
2086 u8 use_green
= rs_use_green(priv
, conf
);
2087 struct iwl4965_rate mcs_rate
;
2089 if (!sta
|| !sta
->rate_ctrl_priv
)
2092 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2093 i
= sta
->last_txrate_idx
;
2095 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2096 (priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
))
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 /* FIXME:RS: This is also wrong in 4965 */
2110 mcs_rate
.rate_n_flags
= iwl4965_rates
[i
].plcp
;
2111 mcs_rate
.rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
2112 mcs_rate
.rate_n_flags
&= ~RATE_MCS_ANT_A_MSK
;
2114 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2115 mcs_rate
.rate_n_flags
|= RATE_MCS_CCK_MSK
;
2117 tbl
->ant_type
= ANT_B
;
2118 rs_get_tbl_info_from_mcs(&mcs_rate
, priv
->band
, tbl
, &rate_idx
);
2119 if (!rs_is_ant_connected(priv
->hw_params
.valid_tx_ant
, tbl
->ant_type
))
2120 rs_toggle_antenna(&mcs_rate
, tbl
);
2122 rs_mcs_from_tbl(&mcs_rate
, tbl
, rate_idx
, use_green
);
2123 tbl
->current_rate
.rate_n_flags
= mcs_rate
.rate_n_flags
;
2124 rs_get_expected_tpt_table(lq_sta
, tbl
);
2125 rs_fill_link_cmd(NULL
, lq_sta
, &mcs_rate
, &lq_sta
->lq
);
2126 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2131 static void rs_get_rate(void *priv_rate
, struct net_device
*dev
,
2132 struct ieee80211_supported_band
*sband
,
2133 struct sk_buff
*skb
,
2134 struct rate_selection
*sel
)
2138 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
2139 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2140 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2141 struct sta_info
*sta
;
2143 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
2144 struct iwl4965_lq_sta
*lq_sta
;
2146 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2150 sta
= sta_info_get(local
, hdr
->addr1
);
2152 /* Send management frames and broadcast/multicast data using lowest
2154 fc
= le16_to_cpu(hdr
->frame_control
);
2155 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
) ||
2156 !sta
|| !sta
->rate_ctrl_priv
) {
2157 sel
->rate
= rate_lowest(local
, sband
, sta
);
2161 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2162 i
= sta
->last_txrate_idx
;
2164 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
2165 !lq_sta
->ibss_sta_added
) {
2166 u8 sta_id
= iwl_find_station(priv
, hdr
->addr1
);
2167 DECLARE_MAC_BUF(mac
);
2169 if (sta_id
== IWL_INVALID_STATION
) {
2170 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2171 print_mac(mac
, hdr
->addr1
));
2172 sta_id
= iwl4965_add_station_flags(priv
, hdr
->addr1
,
2173 0, CMD_ASYNC
, NULL
);
2175 if ((sta_id
!= IWL_INVALID_STATION
)) {
2176 lq_sta
->lq
.sta_id
= sta_id
;
2177 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2178 lq_sta
->ibss_sta_added
= 1;
2179 rs_initialize_lq(priv
, conf
, sta
);
2181 if (!lq_sta
->ibss_sta_added
)
2186 if ((i
< 0) || (i
> IWL_RATE_COUNT
)) {
2187 sel
->rate
= rate_lowest(local
, sband
, sta
);
2191 sel
->rate
= &priv
->ieee_rates
[i
];
2196 static void *rs_alloc_sta(void *priv
, gfp_t gfp
)
2198 struct iwl4965_lq_sta
*lq_sta
;
2201 IWL_DEBUG_RATE("create station rate scale window\n");
2203 lq_sta
= kzalloc(sizeof(struct iwl4965_lq_sta
), gfp
);
2207 lq_sta
->lq
.sta_id
= 0xff;
2210 for (j
= 0; j
< LQ_SIZE
; j
++)
2211 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2212 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2217 static void rs_rate_init(void *priv_rate
, void *priv_sta
,
2218 struct ieee80211_local
*local
,
2219 struct sta_info
*sta
)
2222 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2223 struct ieee80211_supported_band
*sband
;
2224 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
2225 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2227 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
2229 lq_sta
->flush_timer
= 0;
2230 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2231 sta
->txrate_idx
= 3;
2232 for (j
= 0; j
< LQ_SIZE
; j
++)
2233 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2234 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2236 IWL_DEBUG_RATE("rate scale global init\n");
2237 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2238 * the lowest or the highest rate.. Could consider using RSSI from
2239 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2242 lq_sta
->ibss_sta_added
= 0;
2243 if (priv
->iw_mode
== IEEE80211_IF_TYPE_AP
) {
2244 u8 sta_id
= iwl_find_station(priv
, sta
->addr
);
2245 DECLARE_MAC_BUF(mac
);
2247 /* for IBSS the call are from tasklet */
2248 IWL_DEBUG_HT("LQ: ADD station %s\n",
2249 print_mac(mac
, sta
->addr
));
2251 if (sta_id
== IWL_INVALID_STATION
) {
2252 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2253 print_mac(mac
, sta
->addr
));
2254 sta_id
= iwl4965_add_station_flags(priv
, sta
->addr
,
2255 0, CMD_ASYNC
, NULL
);
2257 if ((sta_id
!= IWL_INVALID_STATION
)) {
2258 lq_sta
->lq
.sta_id
= sta_id
;
2259 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2261 /* FIXME: this is w/a remove it later */
2262 priv
->assoc_station_added
= 1;
2265 /* Find highest tx rate supported by hardware and destination station */
2266 for (i
= 0; i
< sband
->n_bitrates
; i
++)
2267 if (sta
->supp_rates
[sband
->band
] & BIT(i
))
2268 sta
->txrate_idx
= i
;
2270 sta
->last_txrate_idx
= sta
->txrate_idx
;
2271 /* WTF is with this bogus comment? A doesn't have cck rates */
2272 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2273 if (local
->hw
.conf
.channel
->band
== IEEE80211_BAND_5GHZ
)
2274 sta
->last_txrate_idx
+= IWL_FIRST_OFDM_RATE
;
2277 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2278 lq_sta
->active_rate
= priv
->active_rate
;
2279 lq_sta
->active_rate
&= ~(0x1000);
2280 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2281 lq_sta
->band
= priv
->band
;
2282 #ifdef CONFIG_IWL4965_HT
2284 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2285 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2287 lq_sta
->active_siso_rate
=
2288 priv
->current_ht_config
.supp_mcs_set
[0] << 1;
2289 lq_sta
->active_siso_rate
|=
2290 priv
->current_ht_config
.supp_mcs_set
[0] & 0x1;
2291 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2292 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2295 lq_sta
->active_mimo2_rate
=
2296 priv
->current_ht_config
.supp_mcs_set
[1] << 1;
2297 lq_sta
->active_mimo2_rate
|=
2298 priv
->current_ht_config
.supp_mcs_set
[1] & 0x1;
2299 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2300 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2302 lq_sta
->active_mimo3_rate
=
2303 priv
->current_ht_config
.supp_mcs_set
[2] << 1;
2304 lq_sta
->active_mimo3_rate
|=
2305 priv
->current_ht_config
.supp_mcs_set
[2] & 0x1;
2306 lq_sta
->active_mimo3_rate
&= ~((u16
)0x2);
2307 lq_sta
->active_mimo3_rate
<<= IWL_FIRST_OFDM_RATE
;
2309 IWL_DEBUG_HT("SISO RATE %X MIMO2 RATE %X MIMO3 RATE %X\n",
2310 lq_sta
->active_siso_rate
,
2311 lq_sta
->active_mimo2_rate
,
2312 lq_sta
->active_mimo3_rate
);
2314 /* as default allow aggregation for all tids */
2315 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2316 #endif /*CONFIG_IWL4965_HT*/
2317 #ifdef CONFIG_MAC80211_DEBUGFS
2321 if (priv
->assoc_station_added
)
2322 priv
->lq_mngr
.lq_ready
= 1;
2324 rs_initialize_lq(priv
, conf
, sta
);
2327 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
2328 struct iwl4965_lq_sta
*lq_sta
,
2329 struct iwl4965_rate
*tx_mcs
,
2330 struct iwl_link_quality_cmd
*lq_cmd
)
2334 int repeat_rate
= 0;
2335 u8 ant_toggle_count
= 0;
2336 u8 use_ht_possible
= 1;
2337 struct iwl4965_rate new_rate
;
2338 struct iwl4965_scale_tbl_info tbl_type
= { 0 };
2340 /* Override starting rate (index 0) if needed for debug purposes */
2341 rs_dbgfs_set_mcs(lq_sta
, tx_mcs
, index
);
2343 /* Interpret rate_n_flags */
2344 rs_get_tbl_info_from_mcs(tx_mcs
, lq_sta
->band
,
2345 &tbl_type
, &rate_idx
);
2347 /* How many times should we repeat the initial rate? */
2348 if (is_legacy(tbl_type
.lq_type
)) {
2349 ant_toggle_count
= 1;
2350 repeat_rate
= IWL_NUMBER_TRY
;
2352 repeat_rate
= IWL_HT_NUMBER_TRY
;
2354 lq_cmd
->general_params
.mimo_delimiter
=
2355 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2357 /* Fill 1st table entry (index 0) */
2358 lq_cmd
->rs_table
[index
].rate_n_flags
=
2359 cpu_to_le32(tx_mcs
->rate_n_flags
);
2360 new_rate
.rate_n_flags
= tx_mcs
->rate_n_flags
;
2363 if (is_mimo(tbl_type
.lq_type
) || (tbl_type
.ant_type
== ANT_A
))
2364 lq_cmd
->general_params
.single_stream_ant_msk
2365 = LINK_QUAL_ANT_A_MSK
;
2367 lq_cmd
->general_params
.single_stream_ant_msk
2368 = LINK_QUAL_ANT_B_MSK
;
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_count
<
2381 NUM_TRY_BEFORE_ANTENNA_TOGGLE
)
2383 else if (priv
&& rs_is_other_ant_connected(
2384 priv
->hw_params
.valid_tx_ant
,
2385 tbl_type
.ant_type
)) {
2386 rs_toggle_antenna(&new_rate
, &tbl_type
);
2387 ant_toggle_count
= 1;
2391 /* Override next rate if needed for debug purposes */
2392 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2394 /* Fill next table entry */
2395 lq_cmd
->rs_table
[index
].rate_n_flags
=
2396 cpu_to_le32(new_rate
.rate_n_flags
);
2401 rs_get_tbl_info_from_mcs(&new_rate
, lq_sta
->band
, &tbl_type
,
2404 /* Indicate to uCode which entries might be MIMO.
2405 * If initial rate was MIMO, this will finally end up
2406 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2407 if (is_mimo(tbl_type
.lq_type
))
2408 lq_cmd
->general_params
.mimo_delimiter
= index
;
2411 rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2412 use_ht_possible
, &new_rate
);
2414 /* How many times should we repeat the next rate? */
2415 if (is_legacy(tbl_type
.lq_type
)) {
2416 if (ant_toggle_count
< NUM_TRY_BEFORE_ANTENNA_TOGGLE
)
2418 else if (priv
&& rs_is_other_ant_connected(
2419 priv
->hw_params
.valid_tx_ant
,
2420 tbl_type
.ant_type
)) {
2421 rs_toggle_antenna(&new_rate
, &tbl_type
);
2422 ant_toggle_count
= 1;
2424 repeat_rate
= IWL_NUMBER_TRY
;
2426 repeat_rate
= IWL_HT_NUMBER_TRY
;
2428 /* Don't allow HT rates after next pass.
2429 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2430 use_ht_possible
= 0;
2432 /* Override next rate if needed for debug purposes */
2433 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2435 /* Fill next table entry */
2436 lq_cmd
->rs_table
[index
].rate_n_flags
=
2437 cpu_to_le32(new_rate
.rate_n_flags
);
2443 lq_cmd
->general_params
.dual_stream_ant_msk
= 3;
2444 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2445 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2448 static void *rs_alloc(struct ieee80211_local
*local
)
2450 return local
->hw
.priv
;
2452 /* rate scale requires free function to be implemented */
2453 static void rs_free(void *priv_rate
)
2458 static void rs_clear(void *priv_rate
)
2460 struct iwl_priv
*priv
= (struct iwl_priv
*) priv_rate
;
2462 IWL_DEBUG_RATE("enter\n");
2464 priv
->lq_mngr
.lq_ready
= 0;
2466 IWL_DEBUG_RATE("leave\n");
2469 static void rs_free_sta(void *priv
, void *priv_sta
)
2471 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2473 IWL_DEBUG_RATE("enter\n");
2475 IWL_DEBUG_RATE("leave\n");
2479 #ifdef CONFIG_MAC80211_DEBUGFS
2480 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2482 file
->private_data
= inode
->i_private
;
2485 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
2486 struct iwl4965_rate
*mcs
, int index
)
2490 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2495 if (lq_sta
->dbg_fixed
.rate_n_flags
) {
2497 mcs
->rate_n_flags
= lq_sta
->dbg_fixed
.rate_n_flags
;
2499 mcs
->rate_n_flags
= base_rate
;
2500 IWL_DEBUG_RATE("Fixed rate ON\n");
2504 IWL_DEBUG_RATE("Fixed rate OFF\n");
2507 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2508 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2510 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2515 memset(buf
, 0, sizeof(buf
));
2516 buf_size
= min(count
, sizeof(buf
) - 1);
2517 if (copy_from_user(buf
, user_buf
, buf_size
))
2520 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2521 lq_sta
->dbg_fixed
.rate_n_flags
= parsed_rate
;
2523 lq_sta
->dbg_fixed
.rate_n_flags
= 0;
2525 lq_sta
->active_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2526 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2527 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2528 lq_sta
->active_mimo3_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2530 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2531 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed
.rate_n_flags
);
2533 if (lq_sta
->dbg_fixed
.rate_n_flags
) {
2534 rs_fill_link_cmd(NULL
, lq_sta
, &lq_sta
->dbg_fixed
, &lq_sta
->lq
);
2535 iwl_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2541 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2542 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2548 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2550 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2551 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2552 lq_sta
->total_failed
, lq_sta
->total_success
,
2553 lq_sta
->active_rate
);
2554 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2555 lq_sta
->dbg_fixed
.rate_n_flags
);
2556 desc
+= sprintf(buff
+desc
, "general:"
2557 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2558 lq_sta
->lq
.general_params
.flags
,
2559 lq_sta
->lq
.general_params
.mimo_delimiter
,
2560 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2561 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2563 desc
+= sprintf(buff
+desc
, "agg:"
2564 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2565 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2566 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2567 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2569 desc
+= sprintf(buff
+desc
,
2570 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2571 lq_sta
->lq
.general_params
.start_rate_index
[0],
2572 lq_sta
->lq
.general_params
.start_rate_index
[1],
2573 lq_sta
->lq
.general_params
.start_rate_index
[2],
2574 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2577 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
2578 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X\n",
2579 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2581 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2584 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2585 .write
= rs_sta_dbgfs_scale_table_write
,
2586 .read
= rs_sta_dbgfs_scale_table_read
,
2587 .open
= open_file_generic
,
2589 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2590 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2596 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2597 for (i
= 0; i
< LQ_SIZE
; i
++) {
2598 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2600 lq_sta
->active_tbl
== i
?"*":"x",
2601 lq_sta
->lq_info
[i
].lq_type
,
2602 lq_sta
->lq_info
[i
].is_SGI
,
2603 lq_sta
->lq_info
[i
].is_fat
,
2604 lq_sta
->lq_info
[i
].is_dup
,
2605 lq_sta
->lq_info
[i
].current_rate
.rate_n_flags
);
2606 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2607 desc
+= sprintf(buff
+desc
,
2608 "counter=%d success=%d %%=%d\n",
2609 lq_sta
->lq_info
[i
].win
[j
].counter
,
2610 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2611 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2614 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2617 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2618 .read
= rs_sta_dbgfs_stats_table_read
,
2619 .open
= open_file_generic
,
2622 static void rs_add_debugfs(void *priv
, void *priv_sta
,
2625 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2626 lq_sta
->rs_sta_dbgfs_scale_table_file
=
2627 debugfs_create_file("rate_scale_table", 0600, dir
,
2628 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
2629 lq_sta
->rs_sta_dbgfs_stats_table_file
=
2630 debugfs_create_file("rate_stats_table", 0600, dir
,
2631 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
2632 #ifdef CONFIG_IWL4965_HT
2633 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
2634 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
2635 &lq_sta
->tx_agg_tid_en
);
2640 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
2642 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2643 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
2644 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
2645 #ifdef CONFIG_IWL4965_HT
2646 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
2651 static struct rate_control_ops rs_ops
= {
2654 .tx_status
= rs_tx_status
,
2655 .get_rate
= rs_get_rate
,
2656 .rate_init
= rs_rate_init
,
2660 .alloc_sta
= rs_alloc_sta
,
2661 .free_sta
= rs_free_sta
,
2662 #ifdef CONFIG_MAC80211_DEBUGFS
2663 .add_sta_debugfs
= rs_add_debugfs
,
2664 .remove_sta_debugfs
= rs_remove_debugfs
,
2668 int iwl4965_fill_rs_info(struct ieee80211_hw
*hw
, char *buf
, u8 sta_id
)
2670 struct ieee80211_local
*local
= hw_to_local(hw
);
2671 struct iwl_priv
*priv
= hw
->priv
;
2672 struct iwl4965_lq_sta
*lq_sta
;
2673 struct sta_info
*sta
;
2675 u32 samples
= 0, success
= 0, good
= 0;
2676 unsigned long now
= jiffies
;
2678 u8 lq_type
, antenna
;
2682 sta
= sta_info_get(local
, priv
->stations
[sta_id
].sta
.sta
.addr
);
2683 if (!sta
|| !sta
->rate_ctrl_priv
) {
2685 IWL_DEBUG_RATE("leave - no private rate data!\n");
2687 IWL_DEBUG_RATE("leave - no station!\n");
2689 return sprintf(buf
, "station %d not found\n", sta_id
);
2692 lq_sta
= (void *)sta
->rate_ctrl_priv
;
2694 lq_type
= lq_sta
->lq_info
[lq_sta
->active_tbl
].lq_type
;
2695 antenna
= lq_sta
->lq_info
[lq_sta
->active_tbl
].ant_type
;
2697 if (is_legacy(lq_type
))
2698 i
= IWL_RATE_54M_INDEX
;
2700 i
= IWL_RATE_60M_INDEX
;
2704 int active
= lq_sta
->active_tbl
;
2707 sprintf(&buf
[cnt
], " %2dMbs: ", iwl4965_rates
[i
].ieee
/ 2);
2709 mask
= (1ULL << (IWL_RATE_MAX_WINDOW
- 1));
2710 for (j
= 0; j
< IWL_RATE_MAX_WINDOW
; j
++, mask
>>= 1)
2712 (lq_sta
->lq_info
[active
].win
[i
].data
& mask
)
2715 samples
+= lq_sta
->lq_info
[active
].win
[i
].counter
;
2716 good
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
;
2717 success
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
*
2718 iwl4965_rates
[i
].ieee
;
2720 if (lq_sta
->lq_info
[active
].win
[i
].stamp
) {
2722 jiffies_to_msecs(now
-
2723 lq_sta
->lq_info
[active
].win
[i
].stamp
);
2725 if (delta
> max_time
)
2728 cnt
+= sprintf(&buf
[cnt
], "%5dms\n", delta
);
2732 j
= iwl4965_get_prev_ieee_rate(i
);
2738 /* Display the average rate of all samples taken.
2740 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2741 * added from iwl4965_rates is actually 2X the rate */
2743 cnt
+= sprintf(&buf
[cnt
],
2744 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2745 "%3d%% success (%d good packets over %d tries)\n",
2746 success
/ (2 * samples
), (success
* 5 / samples
) % 10,
2747 max_time
, good
* 100 / samples
, good
, samples
);
2749 cnt
+= sprintf(&buf
[cnt
], "\nAverage rate: 0Mbs\n");
2751 cnt
+= sprintf(&buf
[cnt
], "\nrate scale type %d antenna %d "
2752 "active_search %d rate index %d\n", lq_type
, antenna
,
2753 lq_sta
->search_better_tbl
, sta
->last_txrate_idx
);
2759 void iwl4965_rate_scale_init(struct ieee80211_hw
*hw
, s32 sta_id
)
2761 struct iwl_priv
*priv
= hw
->priv
;
2763 priv
->lq_mngr
.lq_ready
= 1;
2766 int iwl4965_rate_control_register(void)
2768 return ieee80211_rate_control_register(&rs_ops
);
2771 void iwl4965_rate_control_unregister(void)
2773 ieee80211_rate_control_unregister(&rs_ops
);