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_ANT_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
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 iwl4965_rate_scale_data -- tx success history for one rate
81 struct iwl4965_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 iwl4965_scale_tbl_info -- tx params and success history for all rates
93 * There are two of these in struct iwl4965_lq_sta,
94 * one for "active", and one for "search".
96 struct iwl4965_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 iwl4965_rate_scale_data win
[IWL_RATE_COUNT
]; /* rate histories */
108 #ifdef CONFIG_IWL4965_HT
110 struct iwl4965_traffic_load
{
111 unsigned long time_stamp
; /* age of the oldest statistics */
112 u32 packet_count
[TID_QUEUE_MAX_SIZE
]; /* packet count in this time
114 u32 total
; /* total num of packets during the
115 * last TID_MAX_TIME_DIFF */
116 u8 queue_count
; /* number of queues that has
117 * been used since the last cleanup */
118 u8 head
; /* start of the circular buffer */
121 #endif /* CONFIG_IWL4965_HT */
124 * struct iwl4965_lq_sta -- driver's rate scaling private structure
126 * Pointer to this gets passed back and forth between driver and mac80211.
128 struct iwl4965_lq_sta
{
129 u8 active_tbl
; /* index of active table, range 0-1 */
130 u8 enable_counter
; /* indicates HT mode */
131 u8 stay_in_tbl
; /* 1: disallow, 0: allow search for new mode */
132 u8 search_better_tbl
; /* 1: currently trying alternate mode */
135 /* The following determine when to search for a new mode */
136 u32 table_count_limit
;
137 u32 max_failure_limit
; /* # failed frames before new search */
138 u32 max_success_limit
; /* # successful frames before new search */
140 u32 total_failed
; /* total failed frames, any/all rates */
141 u32 total_success
; /* total successful frames, any/all rates */
142 u32 flush_timer
; /* time staying in mode before new search */
144 u8 action_counter
; /* # mode-switch actions tried */
147 enum ieee80211_band band
;
150 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
152 u16 active_legacy_rate
;
153 u16 active_siso_rate
;
154 u16 active_mimo2_rate
;
155 u16 active_mimo3_rate
;
156 u16 active_rate_basic
;
158 struct iwl_link_quality_cmd lq
;
159 struct iwl4965_scale_tbl_info lq_info
[LQ_SIZE
]; /* "active", "search" */
160 #ifdef CONFIG_IWL4965_HT
161 struct iwl4965_traffic_load load
[TID_MAX_LOAD_COUNT
];
164 #ifdef CONFIG_MAC80211_DEBUGFS
165 struct dentry
*rs_sta_dbgfs_scale_table_file
;
166 struct dentry
*rs_sta_dbgfs_stats_table_file
;
167 #ifdef CONFIG_IWL4965_HT
168 struct dentry
*rs_sta_dbgfs_tx_agg_tid_en_file
;
171 struct iwl_priv
*drv
;
175 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
176 struct net_device
*dev
,
177 struct ieee80211_hdr
*hdr
,
178 struct sta_info
*sta
);
179 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
180 struct iwl4965_lq_sta
*lq_sta
,
184 #ifdef CONFIG_MAC80211_DEBUGFS
185 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
186 u32
*rate_n_flags
, int index
);
188 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
189 u32
*rate_n_flags
, int index
)
194 * Expected throughput metrics for following rates:
195 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
196 * "G" is the only table that supports CCK (the first 4 rates).
198 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
199 static s32 expected_tpt_A
[IWL_RATE_COUNT
] = {
200 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
203 static s32 expected_tpt_G
[IWL_RATE_COUNT
] = {
204 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
207 static s32 expected_tpt_siso20MHz
[IWL_RATE_COUNT
] = {
208 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
211 static s32 expected_tpt_siso20MHzSGI
[IWL_RATE_COUNT
] = {
212 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
215 static s32 expected_tpt_mimo20MHz
[IWL_RATE_COUNT
] = {
216 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
219 static s32 expected_tpt_mimo20MHzSGI
[IWL_RATE_COUNT
] = {
220 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
223 static s32 expected_tpt_siso40MHz
[IWL_RATE_COUNT
] = {
224 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
227 static s32 expected_tpt_siso40MHzSGI
[IWL_RATE_COUNT
] = {
228 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
231 static s32 expected_tpt_mimo40MHz
[IWL_RATE_COUNT
] = {
232 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
235 static s32 expected_tpt_mimo40MHzSGI
[IWL_RATE_COUNT
] = {
236 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
239 static inline u8
rs_extract_rate(u32 rate_n_flags
)
241 return (u8
)(rate_n_flags
& 0xFF);
244 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data
*window
)
247 window
->success_counter
= 0;
248 window
->success_ratio
= IWL_INVALID_VALUE
;
250 window
->average_tpt
= IWL_INVALID_VALUE
;
254 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
256 return ((ant_type
& valid_antenna
) == ant_type
);
259 #ifdef CONFIG_IWL4965_HT
261 * removes the old data from the statistics. All data that is older than
262 * TID_MAX_TIME_DIFF, will be deleted.
264 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load
*tl
, u32 curr_time
)
266 /* The oldest age we want to keep */
267 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
269 while (tl
->queue_count
&&
270 (tl
->time_stamp
< oldest_time
)) {
271 tl
->total
-= tl
->packet_count
[tl
->head
];
272 tl
->packet_count
[tl
->head
] = 0;
273 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
276 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
282 * increment traffic load value for tid and also remove
283 * any old values if passed the certain time period
285 static void rs_tl_add_packet(struct iwl4965_lq_sta
*lq_data
, u8 tid
)
287 u32 curr_time
= jiffies_to_msecs(jiffies
);
290 struct iwl4965_traffic_load
*tl
= NULL
;
292 if (tid
>= TID_MAX_LOAD_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;
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;
326 get the traffic load value for tid
328 static u32
rs_tl_get_load(struct iwl4965_lq_sta
*lq_data
, u8 tid
)
330 u32 curr_time
= jiffies_to_msecs(jiffies
);
333 struct iwl4965_traffic_load
*tl
= NULL
;
335 if (tid
>= TID_MAX_LOAD_COUNT
)
338 tl
= &(lq_data
->load
[tid
]);
340 curr_time
-= curr_time
% TID_ROUND_VALUE
;
342 if (!(tl
->queue_count
))
345 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
346 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
348 /* The history is too long: remove data that is older than */
349 /* TID_MAX_TIME_DIFF */
350 if (index
>= TID_QUEUE_MAX_SIZE
)
351 rs_tl_rm_old_stats(tl
, curr_time
);
356 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv
*priv
,
357 struct iwl4965_lq_sta
*lq_data
, u8 tid
,
358 struct sta_info
*sta
)
361 DECLARE_MAC_BUF(mac
);
363 spin_lock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
364 state
= sta
->ampdu_mlme
.tid_state_tx
[tid
];
365 spin_unlock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
367 if (state
== HT_AGG_STATE_IDLE
&&
368 rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
369 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
370 print_mac(mac
, sta
->addr
), tid
);
371 ieee80211_start_tx_ba_session(priv
->hw
, sta
->addr
, tid
);
375 static void rs_tl_turn_on_agg(struct iwl_priv
*priv
, u8 tid
,
376 struct iwl4965_lq_sta
*lq_data
,
377 struct sta_info
*sta
)
379 if ((tid
< TID_MAX_LOAD_COUNT
))
380 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
381 else if (tid
== IWL_AGG_ALL_TID
)
382 for (tid
= 0; tid
< TID_MAX_LOAD_COUNT
; tid
++)
383 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
386 #endif /* CONFIG_IWLWIFI_HT */
388 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
390 return (!!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
391 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
392 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
));
396 * rs_collect_tx_data - Update the success/failure sliding window
398 * We keep a sliding window of the last 62 packets transmitted
399 * at this rate. window->data contains the bitmask of successful
402 static int rs_collect_tx_data(struct iwl4965_rate_scale_data
*windows
,
403 int scale_index
, s32 tpt
, int retries
,
406 struct iwl4965_rate_scale_data
*window
= NULL
;
407 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
410 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
413 /* Select data for current tx bit rate */
414 window
= &(windows
[scale_index
]);
417 * Keep track of only the latest 62 tx frame attempts in this rate's
418 * history window; anything older isn't really relevant any more.
419 * If we have filled up the sliding window, drop the oldest attempt;
420 * if the oldest attempt (highest bit in bitmap) shows "success",
421 * subtract "1" from the success counter (this is the main reason
422 * we keep these bitmaps!).
424 while (retries
> 0) {
425 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
427 /* remove earliest */
428 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
430 if (window
->data
& mask
) {
431 window
->data
&= ~mask
;
432 window
->success_counter
--;
436 /* Increment frames-attempted counter */
439 /* Shift bitmap by one frame (throw away oldest history),
440 * OR in "1", and increment "success" if this
441 * frame was successful. */
444 window
->success_counter
++;
452 /* Calculate current success ratio, avoid divide-by-0! */
453 if (window
->counter
> 0)
454 window
->success_ratio
= 128 * (100 * window
->success_counter
)
457 window
->success_ratio
= IWL_INVALID_VALUE
;
459 fail_count
= window
->counter
- window
->success_counter
;
461 /* Calculate average throughput, if we have enough history. */
462 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
463 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
464 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
466 window
->average_tpt
= IWL_INVALID_VALUE
;
468 /* Tag this window as having been updated */
469 window
->stamp
= jiffies
;
475 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
477 /* FIXME:RS:remove this function and put the flags statically in the table */
478 static u32
rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info
*tbl
,
479 int index
, u8 use_green
)
481 u32 rate_n_flags
= 0;
483 if (is_legacy(tbl
->lq_type
)) {
484 rate_n_flags
= iwl4965_rates
[index
].plcp
;
485 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
486 rate_n_flags
|= RATE_MCS_CCK_MSK
;
488 } else if (is_Ht(tbl
->lq_type
)) {
489 if (index
> IWL_LAST_OFDM_RATE
) {
490 IWL_ERROR("invalid HT rate index %d\n", index
);
491 index
= IWL_LAST_OFDM_RATE
;
493 rate_n_flags
= RATE_MCS_HT_MSK
;
495 if (is_siso(tbl
->lq_type
))
496 rate_n_flags
|= iwl4965_rates
[index
].plcp_siso
;
497 else if (is_mimo2(tbl
->lq_type
))
498 rate_n_flags
|= iwl4965_rates
[index
].plcp_mimo2
;
500 rate_n_flags
|= iwl4965_rates
[index
].plcp_mimo3
;
502 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl
->lq_type
);
505 rate_n_flags
|= ((tbl
->ant_type
<< RATE_MCS_ANT_POS
) &
506 RATE_MCS_ANT_ABC_MSK
);
508 if (is_Ht(tbl
->lq_type
)) {
511 rate_n_flags
|= RATE_MCS_DUP_MSK
;
513 rate_n_flags
|= RATE_MCS_FAT_MSK
;
516 rate_n_flags
|= RATE_MCS_SGI_MSK
;
519 rate_n_flags
|= RATE_MCS_GF_MSK
;
520 if (is_siso(tbl
->lq_type
) && tbl
->is_SGI
) {
521 rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
522 IWL_ERROR("GF was set with SGI:SISO\n");
530 * Interpret uCode API's rate_n_flags format,
531 * fill "search" or "active" tx mode table.
533 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags
,
534 enum ieee80211_band band
,
535 struct iwl4965_scale_tbl_info
*tbl
,
538 u32 ant_msk
= (rate_n_flags
& RATE_MCS_ANT_ABC_MSK
);
539 u8 num_of_ant
= get_num_of_ant_from_rate(rate_n_flags
);
542 *rate_idx
= iwl4965_hwrate_to_plcp_idx(rate_n_flags
);
544 if (*rate_idx
== IWL_RATE_INVALID
) {
548 tbl
->is_SGI
= 0; /* default legacy setup */
551 tbl
->ant_type
= (ant_msk
>> RATE_MCS_ANT_POS
);
552 tbl
->lq_type
= LQ_NONE
;
554 /* legacy rate format */
555 if (!(rate_n_flags
& RATE_MCS_HT_MSK
)) {
556 if (num_of_ant
== 1) {
557 if (band
== IEEE80211_BAND_5GHZ
)
564 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
567 if ((rate_n_flags
& RATE_MCS_FAT_MSK
) ||
568 (rate_n_flags
& RATE_MCS_DUP_MSK
))
571 if (rate_n_flags
& RATE_MCS_DUP_MSK
)
574 mcs
= rs_extract_rate(rate_n_flags
);
577 if (mcs
<= IWL_RATE_SISO_60M_PLCP
) {
579 tbl
->lq_type
= LQ_SISO
; /*else NONE*/
581 } else if (mcs
<= IWL_RATE_MIMO2_60M_PLCP
) {
583 tbl
->lq_type
= LQ_MIMO2
;
587 tbl
->lq_type
= LQ_MIMO3
;
593 /* switch to another antenna/antennas and return 1 */
594 /* if no other valid antenna found, return 0 */
595 static int rs_toggle_antenna(u32 valid_ant
, u32
*rate_n_flags
,
596 struct iwl4965_scale_tbl_info
*tbl
)
600 if (!tbl
->ant_type
|| tbl
->ant_type
> ANT_ABC
)
603 if (!rs_is_valid_ant(valid_ant
, tbl
->ant_type
))
606 new_ant_type
= ant_toggle_lookup
[tbl
->ant_type
];
608 while ((new_ant_type
!= tbl
->ant_type
) &&
609 !rs_is_valid_ant(valid_ant
, new_ant_type
))
610 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
612 if (new_ant_type
== tbl
->ant_type
)
615 tbl
->ant_type
= new_ant_type
;
616 *rate_n_flags
&= ~RATE_MCS_ANT_ABC_MSK
;
617 *rate_n_flags
|= new_ant_type
<< RATE_MCS_ANT_POS
;
621 /* FIXME:RS: in 4965 we don't use greenfield at all */
622 /* FIXME:RS: don't use greenfield for now in TX */
623 /* #ifdef CONFIG_IWL4965_HT */
625 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
627 return ((conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) &&
628 priv
->current_ht_config
.is_green_field
&&
629 !priv
->current_ht_config
.non_GF_STA_present
);
632 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
636 #endif /* CONFIG_IWL4965_HT */
639 * rs_get_supported_rates - get the available rates
641 * if management frame or broadcast frame only return
642 * basic available rates.
645 static u16
rs_get_supported_rates(struct iwl4965_lq_sta
*lq_sta
,
646 struct ieee80211_hdr
*hdr
,
647 enum iwl_table_type rate_type
)
649 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
650 lq_sta
->active_rate_basic
)
651 return lq_sta
->active_rate_basic
;
653 if (is_legacy(rate_type
)) {
654 return lq_sta
->active_legacy_rate
;
656 if (is_siso(rate_type
))
657 return lq_sta
->active_siso_rate
;
658 else if (is_mimo2(rate_type
))
659 return lq_sta
->active_mimo2_rate
;
661 return lq_sta
->active_mimo3_rate
;
665 static u16
rs_get_adjacent_rate(u8 index
, u16 rate_mask
, int rate_type
)
667 u8 high
= IWL_RATE_INVALID
;
668 u8 low
= IWL_RATE_INVALID
;
670 /* 802.11A or ht walks to the next literal adjacent rate in
672 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
676 /* Find the previous rate that is in the rate mask */
678 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
679 if (rate_mask
& mask
) {
685 /* Find the next rate that is in the rate mask */
687 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
688 if (rate_mask
& mask
) {
694 return (high
<< 8) | low
;
698 while (low
!= IWL_RATE_INVALID
) {
699 low
= iwl4965_rates
[low
].prev_rs
;
700 if (low
== IWL_RATE_INVALID
)
702 if (rate_mask
& (1 << low
))
704 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low
);
708 while (high
!= IWL_RATE_INVALID
) {
709 high
= iwl4965_rates
[high
].next_rs
;
710 if (high
== IWL_RATE_INVALID
)
712 if (rate_mask
& (1 << high
))
714 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high
);
717 return (high
<< 8) | low
;
720 static u32
rs_get_lower_rate(struct iwl4965_lq_sta
*lq_sta
,
721 struct iwl4965_scale_tbl_info
*tbl
, u8 scale_index
,
727 u8 switch_to_legacy
= 0;
728 u8 is_green
= lq_sta
->is_green
;
730 /* check if we need to switch from HT to legacy rates.
731 * assumption is that mandatory rates (1Mbps or 6Mbps)
732 * are always supported (spec demand) */
733 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
734 switch_to_legacy
= 1;
735 scale_index
= rs_ht_to_legacy
[scale_index
];
736 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
741 if (num_of_ant(tbl
->ant_type
) > 1)
742 tbl
->ant_type
= ANT_A
;/*FIXME:RS*/
748 rate_mask
= rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
);
750 /* Mask with station rate restriction */
751 if (is_legacy(tbl
->lq_type
)) {
752 /* supp_rates has no CCK bits in A mode */
753 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
754 rate_mask
= (u16
)(rate_mask
&
755 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
757 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
760 /* If we switched from HT to legacy, check current rate */
761 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
766 high_low
= rs_get_adjacent_rate(scale_index
, rate_mask
, tbl
->lq_type
);
767 low
= high_low
& 0xff;
769 if (low
== IWL_RATE_INVALID
)
773 return rate_n_flags_from_tbl(tbl
, low
, is_green
);
777 * mac80211 sends us Tx status
779 static void rs_tx_status(void *priv_rate
, struct net_device
*dev
,
781 struct ieee80211_tx_status
*tx_resp
)
785 int rs_index
, index
= 0;
786 struct iwl4965_lq_sta
*lq_sta
;
787 struct iwl_link_quality_cmd
*table
;
788 struct sta_info
*sta
;
789 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
790 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
791 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
792 struct ieee80211_hw
*hw
= local_to_hw(local
);
793 struct iwl4965_rate_scale_data
*window
= NULL
;
794 struct iwl4965_rate_scale_data
*search_win
= NULL
;
796 struct iwl4965_scale_tbl_info tbl_type
;
797 struct iwl4965_scale_tbl_info
*curr_tbl
, *search_tbl
;
799 u16 fc
= le16_to_cpu(hdr
->frame_control
);
802 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
804 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
))
807 /* This packet was aggregated but doesn't carry rate scale info */
808 if ((tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
) &&
809 !(tx_resp
->flags
& IEEE80211_TX_STATUS_AMPDU
))
812 retries
= tx_resp
->retry_count
;
819 sta
= sta_info_get(local
, hdr
->addr1
);
821 if (!sta
|| !sta
->rate_ctrl_priv
)
825 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
827 if (!priv
->lq_mngr
.lq_ready
)
830 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
831 !lq_sta
->ibss_sta_added
)
835 active_index
= lq_sta
->active_tbl
;
837 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
838 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
839 window
= (struct iwl4965_rate_scale_data
*)
841 search_win
= (struct iwl4965_rate_scale_data
*)
842 &(search_tbl
->win
[0]);
845 * Ignore this Tx frame response if its initial rate doesn't match
846 * that of latest Link Quality command. There may be stragglers
847 * from a previous Link Quality command, but we're no longer interested
848 * in those; they're either from the "active" mode while we're trying
849 * to check "search" mode, or a prior "search" mode after we've moved
850 * to a new "search" mode (which might become the new "active" mode).
852 tx_rate
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
853 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
854 if (priv
->band
== IEEE80211_BAND_5GHZ
)
855 rs_index
-= IWL_FIRST_OFDM_RATE
;
857 if ((tx_resp
->control
.tx_rate
== NULL
) ||
859 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_SHORT_GI
)) ||
861 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_40_MHZ_WIDTH
)) ||
863 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_DUP_DATA
)) ||
864 (tbl_type
.ant_type
^ tx_resp
->control
.antenna_sel_tx
) ||
865 (!!(tx_rate
& RATE_MCS_HT_MSK
) ^
866 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_OFDM_HT
)) ||
867 (!!(tx_rate
& RATE_MCS_GF_MSK
) ^
868 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_GREEN_FIELD
)) ||
869 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
870 tx_resp
->control
.tx_rate
->bitrate
)) {
871 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate
);
875 /* Update frame history window with "failure" for each Tx retry. */
877 /* Look up the rate and other info used for each tx attempt.
878 * Each tx attempt steps one entry deeper in the rate table. */
879 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
880 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
,
881 &tbl_type
, &rs_index
);
883 /* If type matches "search" table,
884 * add failure to "search" history */
885 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
886 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
887 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
888 if (search_tbl
->expected_tpt
)
889 tpt
= search_tbl
->expected_tpt
[rs_index
];
892 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
894 /* Else if type matches "current/active" table,
895 * add failure to "current/active" history */
896 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
897 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
898 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
899 if (curr_tbl
->expected_tpt
)
900 tpt
= curr_tbl
->expected_tpt
[rs_index
];
903 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
906 /* If not searching for a new mode, increment failed counter
907 * ... this helps determine when to start searching again */
908 if (lq_sta
->stay_in_tbl
)
909 lq_sta
->total_failed
++;
916 * Find (by rate) the history window to update with final Tx attempt;
917 * if Tx was successful first try, use original rate,
918 * else look up the rate that was, finally, successful.
920 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
921 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
923 /* Update frame history window with "success" if Tx got ACKed ... */
924 if (tx_resp
->flags
& IEEE80211_TX_STATUS_ACK
)
929 /* If type matches "search" table,
930 * add final tx status to "search" history */
931 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
932 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
933 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
934 if (search_tbl
->expected_tpt
)
935 tpt
= search_tbl
->expected_tpt
[rs_index
];
938 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
)
939 rs_collect_tx_data(search_win
, rs_index
, tpt
,
940 tx_resp
->ampdu_ack_len
,
941 tx_resp
->ampdu_ack_map
);
943 rs_collect_tx_data(search_win
, rs_index
, tpt
,
945 /* Else if type matches "current/active" table,
946 * add final tx status to "current/active" history */
947 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
948 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
949 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
950 if (curr_tbl
->expected_tpt
)
951 tpt
= curr_tbl
->expected_tpt
[rs_index
];
954 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
)
955 rs_collect_tx_data(window
, rs_index
, tpt
,
956 tx_resp
->ampdu_ack_len
,
957 tx_resp
->ampdu_ack_map
);
959 rs_collect_tx_data(window
, rs_index
, tpt
,
963 /* If not searching for new mode, increment success/failed counter
964 * ... these help determine when to start searching again */
965 if (lq_sta
->stay_in_tbl
) {
966 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
) {
967 lq_sta
->total_success
+= tx_resp
->ampdu_ack_map
;
968 lq_sta
->total_failed
+=
969 (tx_resp
->ampdu_ack_len
- tx_resp
->ampdu_ack_map
);
972 lq_sta
->total_success
++;
974 lq_sta
->total_failed
++;
978 /* See if there's a better rate or modulation mode to try. */
979 rs_rate_scale_perform(priv
, dev
, hdr
, sta
);
986 * Begin a period of staying with a selected modulation mode.
987 * Set "stay_in_tbl" flag to prevent any mode switches.
988 * Set frame tx success limits according to legacy vs. high-throughput,
989 * and reset overall (spanning all rates) tx success history statistics.
990 * These control how long we stay using same modulation mode before
991 * searching for a new mode.
993 static void rs_set_stay_in_table(u8 is_legacy
,
994 struct iwl4965_lq_sta
*lq_sta
)
996 IWL_DEBUG_RATE("we are staying in the same table\n");
997 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
999 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
1000 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
1001 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
1003 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
1004 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
1005 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
1007 lq_sta
->table_count
= 0;
1008 lq_sta
->total_failed
= 0;
1009 lq_sta
->total_success
= 0;
1013 * Find correct throughput table for given mode of modulation
1015 static void rs_set_expected_tpt_table(struct iwl4965_lq_sta
*lq_sta
,
1016 struct iwl4965_scale_tbl_info
*tbl
)
1018 if (is_legacy(tbl
->lq_type
)) {
1019 if (!is_a_band(tbl
->lq_type
))
1020 tbl
->expected_tpt
= expected_tpt_G
;
1022 tbl
->expected_tpt
= expected_tpt_A
;
1023 } else if (is_siso(tbl
->lq_type
)) {
1024 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1026 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
1028 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
1029 else if (tbl
->is_SGI
)
1030 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
1032 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1034 } else if (is_mimo(tbl
->lq_type
)) { /* FIXME:need to separate mimo2/3 */
1035 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1037 tbl
->expected_tpt
= expected_tpt_mimo40MHzSGI
;
1039 tbl
->expected_tpt
= expected_tpt_mimo40MHz
;
1040 else if (tbl
->is_SGI
)
1041 tbl
->expected_tpt
= expected_tpt_mimo20MHzSGI
;
1043 tbl
->expected_tpt
= expected_tpt_mimo20MHz
;
1045 tbl
->expected_tpt
= expected_tpt_G
;
1048 #ifdef CONFIG_IWL4965_HT
1050 * Find starting rate for new "search" high-throughput mode of modulation.
1051 * Goal is to find lowest expected rate (under perfect conditions) that is
1052 * above the current measured throughput of "active" mode, to give new mode
1053 * a fair chance to prove itself without too many challenges.
1055 * This gets called when transitioning to more aggressive modulation
1056 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1057 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1058 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1059 * bit rate will typically need to increase, but not if performance was bad.
1061 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1062 struct iwl4965_lq_sta
*lq_sta
,
1063 struct iwl4965_scale_tbl_info
*tbl
, /* "search" */
1064 u16 rate_mask
, s8 index
)
1066 /* "active" values */
1067 struct iwl4965_scale_tbl_info
*active_tbl
=
1068 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1069 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1070 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1072 /* expected "search" throughput */
1073 s32
*tpt_tbl
= tbl
->expected_tpt
;
1075 s32 new_rate
, high
, low
, start_hi
;
1079 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1082 high_low
= rs_get_adjacent_rate(rate
, rate_mask
, tbl
->lq_type
);
1084 low
= high_low
& 0xff;
1085 high
= (high_low
>> 8) & 0xff;
1088 * Lower the "search" bit rate, to give new "search" mode
1089 * approximately the same throughput as "active" if:
1091 * 1) "Active" mode has been working modestly well (but not
1092 * great), and expected "search" throughput (under perfect
1093 * conditions) at candidate rate is above the actual
1094 * measured "active" throughput (but less than expected
1095 * "active" throughput under perfect conditions).
1097 * 2) "Active" mode has been working perfectly or very well
1098 * and expected "search" throughput (under perfect
1099 * conditions) at candidate rate is above expected
1100 * "active" throughput (under perfect conditions).
1102 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1103 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1104 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1105 (tpt_tbl
[rate
] <= active_tpt
))) ||
1106 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1107 (tpt_tbl
[rate
] > active_tpt
))) {
1109 /* (2nd or later pass)
1110 * If we've already tried to raise the rate, and are
1111 * now trying to lower it, use the higher rate. */
1112 if (start_hi
!= IWL_RATE_INVALID
) {
1113 new_rate
= start_hi
;
1119 /* Loop again with lower rate */
1120 if (low
!= IWL_RATE_INVALID
)
1123 /* Lower rate not available, use the original */
1127 /* Else try to raise the "search" rate to match "active" */
1129 /* (2nd or later pass)
1130 * If we've already tried to lower the rate, and are
1131 * now trying to raise it, use the lower rate. */
1132 if (new_rate
!= IWL_RATE_INVALID
)
1135 /* Loop again with higher rate */
1136 else if (high
!= IWL_RATE_INVALID
) {
1140 /* Higher rate not available, use the original */
1150 #endif /* CONFIG_IWL4965_HT */
1153 * Set up search table for MIMO
1155 #ifdef CONFIG_IWL4965_HT
1156 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1157 struct iwl4965_lq_sta
*lq_sta
,
1158 struct ieee80211_conf
*conf
,
1159 struct sta_info
*sta
,
1160 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1164 s8 is_green
= lq_sta
->is_green
;
1166 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1167 !sta
->ht_info
.ht_supported
)
1170 if (priv
->current_ht_config
.tx_mimo_ps_mode
== IWL_MIMO_PS_STATIC
)
1173 /* Need both Tx chains/antennas to support MIMO */
1174 if (priv
->hw_params
.tx_chains_num
< 2)
1177 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1179 tbl
->lq_type
= LQ_MIMO2
;
1180 tbl
->is_dup
= lq_sta
->is_dup
;
1182 rate_mask
= lq_sta
->active_mimo2_rate
;
1184 if (priv
->current_ht_config
.supported_chan_width
1185 == IWL_CHANNEL_WIDTH_40MHZ
)
1190 /* FIXME: - don't toggle SGI here
1192 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1196 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1202 rs_set_expected_tpt_table(lq_sta
, tbl
);
1204 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1206 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate
, rate_mask
);
1208 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1209 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1213 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, rate
, is_green
);
1215 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1216 tbl
->current_rate
, is_green
);
1220 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1221 struct iwl4965_lq_sta
*lq_sta
,
1222 struct ieee80211_conf
*conf
,
1223 struct sta_info
*sta
,
1224 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1228 #endif /*CONFIG_IWL4965_HT */
1231 * Set up search table for SISO
1233 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1234 struct iwl4965_lq_sta
*lq_sta
,
1235 struct ieee80211_conf
*conf
,
1236 struct sta_info
*sta
,
1237 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1239 #ifdef CONFIG_IWL4965_HT
1241 u8 is_green
= lq_sta
->is_green
;
1244 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1245 !sta
->ht_info
.ht_supported
)
1248 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1250 tbl
->is_dup
= lq_sta
->is_dup
;
1251 tbl
->lq_type
= LQ_SISO
;
1253 rate_mask
= lq_sta
->active_siso_rate
;
1255 if (priv
->current_ht_config
.supported_chan_width
1256 == IWL_CHANNEL_WIDTH_40MHZ
)
1261 /* FIXME: - don't toggle SGI here
1263 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1267 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1274 tbl
->is_SGI
= 0; /*11n spec: no SGI in SISO+Greenfield*/
1276 rs_set_expected_tpt_table(lq_sta
, tbl
);
1277 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1279 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1280 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1281 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1285 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, rate
, is_green
);
1286 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1287 tbl
->current_rate
, is_green
);
1291 #endif /*CONFIG_IWL4965_HT */
1295 * Try to switch to new modulation mode from legacy
1297 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1298 struct iwl4965_lq_sta
*lq_sta
,
1299 struct ieee80211_conf
*conf
,
1300 struct sta_info
*sta
,
1303 struct iwl4965_scale_tbl_info
*tbl
=
1304 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1305 struct iwl4965_scale_tbl_info
*search_tbl
=
1306 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1307 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1308 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1309 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1310 u8 start_action
= tbl
->action
;
1311 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1315 switch (tbl
->action
) {
1316 case IWL_LEGACY_SWITCH_ANTENNA
:
1317 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1319 lq_sta
->action_counter
++;
1321 /* Don't change antenna if success has been great */
1322 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1325 /* Set up search table to try other antenna */
1326 memcpy(search_tbl
, tbl
, sz
);
1328 if (rs_toggle_antenna(valid_tx_ant
,
1329 &search_tbl
->current_rate
, search_tbl
)) {
1330 lq_sta
->search_better_tbl
= 1;
1334 case IWL_LEGACY_SWITCH_SISO
:
1335 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1337 /* Set up search table to try SISO */
1338 memcpy(search_tbl
, tbl
, sz
);
1339 search_tbl
->is_SGI
= 0;
1340 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1343 lq_sta
->search_better_tbl
= 1;
1344 lq_sta
->action_counter
= 0;
1349 case IWL_LEGACY_SWITCH_MIMO2
:
1350 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1352 /* Set up search table to try MIMO */
1353 memcpy(search_tbl
, tbl
, sz
);
1354 search_tbl
->is_SGI
= 0;
1355 search_tbl
->ant_type
= ANT_AB
;/*FIXME:RS*/
1356 /*FIXME:RS:need to check ant validity*/
1357 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1360 lq_sta
->search_better_tbl
= 1;
1361 lq_sta
->action_counter
= 0;
1367 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2
)
1368 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1370 if (tbl
->action
== start_action
)
1378 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2
)
1379 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1385 * Try to switch to new modulation mode from SISO
1387 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1388 struct iwl4965_lq_sta
*lq_sta
,
1389 struct ieee80211_conf
*conf
,
1390 struct sta_info
*sta
,
1393 u8 is_green
= lq_sta
->is_green
;
1394 struct iwl4965_scale_tbl_info
*tbl
=
1395 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1396 struct iwl4965_scale_tbl_info
*search_tbl
=
1397 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1398 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1399 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1400 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1401 u8 start_action
= tbl
->action
;
1402 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1406 lq_sta
->action_counter
++;
1407 switch (tbl
->action
) {
1408 case IWL_SISO_SWITCH_ANTENNA
:
1409 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1410 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1413 memcpy(search_tbl
, tbl
, sz
);
1414 if (rs_toggle_antenna(valid_tx_ant
,
1415 &search_tbl
->current_rate
, search_tbl
)) {
1416 lq_sta
->search_better_tbl
= 1;
1420 case IWL_SISO_SWITCH_MIMO2
:
1421 IWL_DEBUG_RATE("LQ: SISO switch to MIMO\n");
1422 memcpy(search_tbl
, tbl
, sz
);
1423 search_tbl
->is_SGI
= 0;
1424 search_tbl
->ant_type
= ANT_AB
; /*FIXME:RS*/
1425 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1428 lq_sta
->search_better_tbl
= 1;
1432 case IWL_SISO_SWITCH_GI
:
1433 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1435 memcpy(search_tbl
, tbl
, sz
);
1440 IWL_ERROR("SGI was set in GF+SISO\n");
1442 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1443 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1445 s32 tpt
= lq_sta
->last_tpt
/ 100;
1446 if (tpt
>= search_tbl
->expected_tpt
[index
])
1449 search_tbl
->current_rate
= rate_n_flags_from_tbl(
1450 search_tbl
, index
, is_green
);
1451 lq_sta
->search_better_tbl
= 1;
1455 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1456 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1458 if (tbl
->action
== start_action
)
1465 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1466 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1471 * Try to switch to new modulation mode from MIMO
1473 static int rs_move_mimo_to_other(struct iwl_priv
*priv
,
1474 struct iwl4965_lq_sta
*lq_sta
,
1475 struct ieee80211_conf
*conf
,
1476 struct sta_info
*sta
,
1479 s8 is_green
= lq_sta
->is_green
;
1480 struct iwl4965_scale_tbl_info
*tbl
=
1481 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1482 struct iwl4965_scale_tbl_info
*search_tbl
=
1483 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1484 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1485 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1486 u8 start_action
= tbl
->action
;
1487 /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1491 lq_sta
->action_counter
++;
1492 switch (tbl
->action
) {
1493 case IWL_MIMO_SWITCH_ANTENNA_A
:
1494 case IWL_MIMO_SWITCH_ANTENNA_B
:
1495 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1497 /* Set up new search table for SISO */
1498 memcpy(search_tbl
, tbl
, sz
);
1500 /*FIXME:RS:need to check ant validity + C*/
1501 if (tbl
->action
== IWL_MIMO_SWITCH_ANTENNA_A
)
1502 search_tbl
->ant_type
= ANT_A
;
1504 search_tbl
->ant_type
= ANT_B
;
1506 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1509 lq_sta
->search_better_tbl
= 1;
1514 case IWL_MIMO_SWITCH_GI
:
1515 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1517 /* Set up new search table for MIMO */
1518 memcpy(search_tbl
, tbl
, sz
);
1519 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1520 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1522 * If active table already uses the fastest possible
1523 * modulation (dual stream with short guard interval),
1524 * and it's working well, there's no need to look
1525 * for a better type of modulation!
1528 s32 tpt
= lq_sta
->last_tpt
/ 100;
1529 if (tpt
>= search_tbl
->expected_tpt
[index
])
1532 search_tbl
->current_rate
= rate_n_flags_from_tbl(
1533 search_tbl
, index
, is_green
);
1534 lq_sta
->search_better_tbl
= 1;
1539 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1540 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1542 if (tbl
->action
== start_action
)
1549 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1550 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1556 * Check whether we should continue using same modulation mode, or
1557 * begin search for a new mode, based on:
1558 * 1) # tx successes or failures while using this mode
1559 * 2) # times calling this function
1560 * 3) elapsed time in this mode (not used, for now)
1562 static void rs_stay_in_table(struct iwl4965_lq_sta
*lq_sta
)
1564 struct iwl4965_scale_tbl_info
*tbl
;
1567 int flush_interval_passed
= 0;
1569 active_tbl
= lq_sta
->active_tbl
;
1571 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1573 /* If we've been disallowing search, see if we should now allow it */
1574 if (lq_sta
->stay_in_tbl
) {
1576 /* Elapsed time using current modulation mode */
1577 if (lq_sta
->flush_timer
)
1578 flush_interval_passed
=
1580 (unsigned long)(lq_sta
->flush_timer
+
1581 IWL_RATE_SCALE_FLUSH_INTVL
));
1584 * Check if we should allow search for new modulation mode.
1585 * If many frames have failed or succeeded, or we've used
1586 * this same modulation for a long time, allow search, and
1587 * reset history stats that keep track of whether we should
1588 * allow a new search. Also (below) reset all bitmaps and
1589 * stats in active history.
1591 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1592 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1593 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1594 && (flush_interval_passed
))) {
1595 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1596 lq_sta
->total_failed
,
1597 lq_sta
->total_success
,
1598 flush_interval_passed
);
1600 /* Allow search for new mode */
1601 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1602 lq_sta
->total_failed
= 0;
1603 lq_sta
->total_success
= 0;
1604 lq_sta
->flush_timer
= 0;
1607 * Else if we've used this modulation mode enough repetitions
1608 * (regardless of elapsed time or success/failure), reset
1609 * history bitmaps and rate-specific stats for all rates in
1613 lq_sta
->table_count
++;
1614 if (lq_sta
->table_count
>=
1615 lq_sta
->table_count_limit
) {
1616 lq_sta
->table_count
= 0;
1618 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1619 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1620 rs_rate_scale_clear_window(
1625 /* If transitioning to allow "search", reset all history
1626 * bitmaps and stats in active table (this will become the new
1627 * "search" table). */
1628 if (!lq_sta
->stay_in_tbl
) {
1629 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1630 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1636 * Do rate scaling and search for new modulation mode.
1638 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
1639 struct net_device
*dev
,
1640 struct ieee80211_hdr
*hdr
,
1641 struct sta_info
*sta
)
1643 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1644 struct ieee80211_hw
*hw
= local_to_hw(local
);
1645 struct ieee80211_conf
*conf
= &hw
->conf
;
1646 int low
= IWL_RATE_INVALID
;
1647 int high
= IWL_RATE_INVALID
;
1650 struct iwl4965_rate_scale_data
*window
= NULL
;
1651 int current_tpt
= IWL_INVALID_VALUE
;
1652 int low_tpt
= IWL_INVALID_VALUE
;
1653 int high_tpt
= IWL_INVALID_VALUE
;
1655 s8 scale_action
= 0;
1658 struct iwl4965_lq_sta
*lq_sta
;
1659 struct iwl4965_scale_tbl_info
*tbl
, *tbl1
;
1660 u16 rate_scale_index_msk
= 0;
1666 #ifdef CONFIG_IWL4965_HT
1667 u8 tid
= MAX_TID_COUNT
;
1671 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1673 fc
= le16_to_cpu(hdr
->frame_control
);
1674 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
)) {
1675 /* Send management frames and broadcast/multicast data using
1677 /* TODO: this could probably be improved.. */
1681 if (!sta
|| !sta
->rate_ctrl_priv
)
1684 if (!priv
->lq_mngr
.lq_ready
) {
1685 IWL_DEBUG_RATE("still rate scaling not ready\n");
1688 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
1690 #ifdef CONFIG_IWL4965_HT
1691 qc
= ieee80211_get_qos_ctrl(hdr
);
1693 tid
= (u8
)(le16_to_cpu(*qc
) & 0xf);
1694 rs_tl_add_packet(lq_sta
, tid
);
1698 * Select rate-scale / modulation-mode table to work with in
1699 * the rest of this function: "search" if searching for better
1700 * modulation mode, or "active" if doing rate scaling within a mode.
1702 if (!lq_sta
->search_better_tbl
)
1703 active_tbl
= lq_sta
->active_tbl
;
1705 active_tbl
= 1 - lq_sta
->active_tbl
;
1707 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1708 is_green
= lq_sta
->is_green
;
1710 /* current tx rate */
1711 index
= sta
->last_txrate_idx
;
1713 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index
,
1716 /* rates available for this association, and for modulation mode */
1717 rate_mask
= rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
);
1719 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask
);
1721 /* mask with station rate restriction */
1722 if (is_legacy(tbl
->lq_type
)) {
1723 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1724 /* supp_rates has no CCK bits in A mode */
1725 rate_scale_index_msk
= (u16
) (rate_mask
&
1726 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
1728 rate_scale_index_msk
= (u16
) (rate_mask
&
1729 lq_sta
->supp_rates
);
1732 rate_scale_index_msk
= rate_mask
;
1734 if (!rate_scale_index_msk
)
1735 rate_scale_index_msk
= rate_mask
;
1737 if (!((1 << index
) & rate_scale_index_msk
)) {
1738 IWL_ERROR("Current Rate is not valid\n");
1742 /* Get expected throughput table and history window for current rate */
1743 if (!tbl
->expected_tpt
) {
1744 IWL_ERROR("tbl->expected_tpt is NULL\n");
1748 window
= &(tbl
->win
[index
]);
1751 * If there is not enough history to calculate actual average
1752 * throughput, keep analyzing results of more tx frames, without
1753 * changing rate or mode (bypass most of the rest of this function).
1754 * Set up new rate table in uCode only if old rate is not supported
1755 * in current association (use new rate found above).
1757 fail_count
= window
->counter
- window
->success_counter
;
1758 if ((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
1759 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
)) {
1760 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1762 window
->success_counter
, window
->counter
, index
);
1764 /* Can't calculate this yet; not enough history */
1765 window
->average_tpt
= IWL_INVALID_VALUE
;
1767 /* Should we stay with this modulation mode,
1768 * or search for a new one? */
1769 rs_stay_in_table(lq_sta
);
1773 /* Else we have enough samples; calculate estimate of
1774 * actual average throughput */
1776 /*FIXME:RS remove this else if we don't get this error*/
1777 if (window
->average_tpt
!= ((window
->success_ratio
*
1778 tbl
->expected_tpt
[index
] + 64) / 128)) {
1779 IWL_ERROR("expected_tpt should have been calculated"
1781 window
->average_tpt
= ((window
->success_ratio
*
1782 tbl
->expected_tpt
[index
] + 64) / 128);
1786 /* If we are searching for better modulation mode, check success. */
1787 if (lq_sta
->search_better_tbl
) {
1789 /* If good success, continue using the "search" mode;
1790 * no need to send new link quality command, since we're
1791 * continuing to use the setup that we've been trying. */
1792 if (window
->average_tpt
> lq_sta
->last_tpt
) {
1794 IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1795 "suc=%d cur-tpt=%d old-tpt=%d\n",
1796 window
->success_ratio
,
1797 window
->average_tpt
,
1800 if (!is_legacy(tbl
->lq_type
))
1801 lq_sta
->enable_counter
= 1;
1803 /* Swap tables; "search" becomes "active" */
1804 lq_sta
->active_tbl
= active_tbl
;
1805 current_tpt
= window
->average_tpt
;
1807 /* Else poor success; go back to mode in "active" table */
1810 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1811 "suc=%d cur-tpt=%d old-tpt=%d\n",
1812 window
->success_ratio
,
1813 window
->average_tpt
,
1816 /* Nullify "search" table */
1817 tbl
->lq_type
= LQ_NONE
;
1819 /* Revert to "active" table */
1820 active_tbl
= lq_sta
->active_tbl
;
1821 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1823 /* Revert to "active" rate and throughput info */
1824 index
= iwl4965_hwrate_to_plcp_idx(
1826 current_tpt
= lq_sta
->last_tpt
;
1828 /* Need to set up a new rate table in uCode */
1832 /* Either way, we've made a decision; modulation mode
1833 * search is done, allow rate adjustment next time. */
1834 lq_sta
->search_better_tbl
= 0;
1835 done_search
= 1; /* Don't switch modes below! */
1839 /* (Else) not in search of better modulation mode, try for better
1840 * starting rate, while staying in this mode. */
1841 high_low
= rs_get_adjacent_rate(index
, rate_scale_index_msk
,
1843 low
= high_low
& 0xff;
1844 high
= (high_low
>> 8) & 0xff;
1846 /* Collect measured throughputs for current and adjacent rates */
1847 current_tpt
= window
->average_tpt
;
1848 if (low
!= IWL_RATE_INVALID
)
1849 low_tpt
= tbl
->win
[low
].average_tpt
;
1850 if (high
!= IWL_RATE_INVALID
)
1851 high_tpt
= tbl
->win
[high
].average_tpt
;
1853 /* Assume rate increase */
1856 /* Too many failures, decrease rate */
1857 if ((window
->success_ratio
<= IWL_RATE_DECREASE_TH
) ||
1858 (current_tpt
== 0)) {
1859 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1862 /* No throughput measured yet for adjacent rates; try increase. */
1863 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
1864 (high_tpt
== IWL_INVALID_VALUE
))
1867 /* Both adjacent throughputs are measured, but neither one has better
1868 * throughput; we're using the best rate, don't change it! */
1869 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1870 (high_tpt
!= IWL_INVALID_VALUE
) &&
1871 (low_tpt
< current_tpt
) &&
1872 (high_tpt
< current_tpt
))
1875 /* At least one adjacent rate's throughput is measured,
1876 * and may have better performance. */
1878 /* Higher adjacent rate's throughput is measured */
1879 if (high_tpt
!= IWL_INVALID_VALUE
) {
1880 /* Higher rate has better throughput */
1881 if (high_tpt
> current_tpt
)
1885 ("decrease rate because of high tpt\n");
1889 /* Lower adjacent rate's throughput is measured */
1890 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
1891 /* Lower rate has better throughput */
1892 if (low_tpt
> current_tpt
) {
1894 ("decrease rate because of low tpt\n");
1901 /* Sanity check; asked for decrease, but success rate or throughput
1902 * has been good at old rate. Don't change it. */
1903 if (scale_action
== -1) {
1904 if ((low
!= IWL_RATE_INVALID
) &&
1905 ((window
->success_ratio
> IWL_RATE_HIGH_TH
) ||
1906 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
1909 /* Sanity check; asked for increase, but success rate has not been great
1910 * even at old rate, higher rate will be worse. Don't change it. */
1911 } else if ((scale_action
== 1) &&
1912 (window
->success_ratio
< IWL_RATE_INCREASE_TH
))
1915 switch (scale_action
) {
1917 /* Decrease starting rate, update uCode's rate table */
1918 if (low
!= IWL_RATE_INVALID
) {
1924 /* Increase starting rate, update uCode's rate table */
1925 if (high
!= IWL_RATE_INVALID
) {
1937 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1938 "high %d type %d\n",
1939 index
, scale_action
, low
, high
, tbl
->lq_type
);
1942 /* Replace uCode's rate table for the destination station. */
1944 rate
= rate_n_flags_from_tbl(tbl
, index
, is_green
);
1945 rs_fill_link_cmd(priv
, lq_sta
, rate
);
1946 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1949 /* Should we stay with this modulation mode, or search for a new one? */
1950 rs_stay_in_table(lq_sta
);
1953 * Search for new modulation mode if we're:
1954 * 1) Not changing rates right now
1955 * 2) Not just finishing up a search
1956 * 3) Allowing a new search
1958 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
) {
1959 /* Save current throughput to compare with "search" throughput*/
1960 lq_sta
->last_tpt
= current_tpt
;
1962 /* Select a new "search" modulation mode to try.
1963 * If one is found, set up the new "search" table. */
1964 if (is_legacy(tbl
->lq_type
))
1965 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
1966 else if (is_siso(tbl
->lq_type
))
1967 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
1969 rs_move_mimo_to_other(priv
, lq_sta
, conf
, sta
, index
);
1971 /* If new "search" mode was selected, set up in uCode table */
1972 if (lq_sta
->search_better_tbl
) {
1973 /* Access the "search" table, clear its history. */
1974 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1975 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1976 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1978 /* Use new "search" start rate */
1979 index
= iwl4965_hwrate_to_plcp_idx(
1982 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1983 tbl
->current_rate
, index
);
1984 rs_fill_link_cmd(priv
, lq_sta
, tbl
->current_rate
);
1985 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1988 /* If the "active" (non-search) mode was legacy,
1989 * and we've tried switching antennas,
1990 * but we haven't been able to try HT modes (not available),
1991 * stay with best antenna legacy modulation for a while
1992 * before next round of mode comparisons. */
1993 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1994 if (is_legacy(tbl1
->lq_type
) &&
1995 #ifdef CONFIG_IWL4965_HT
1996 (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
)) &&
1998 (lq_sta
->action_counter
>= 1)) {
1999 lq_sta
->action_counter
= 0;
2000 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2001 rs_set_stay_in_table(1, lq_sta
);
2004 /* If we're in an HT mode, and all 3 mode switch actions
2005 * have been tried and compared, stay in this best modulation
2006 * mode for a while before next round of mode comparisons. */
2007 if (lq_sta
->enable_counter
&&
2008 (lq_sta
->action_counter
>= IWL_ACTION_LIMIT
)) {
2009 #ifdef CONFIG_IWL4965_HT
2010 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2011 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2012 (tid
!= MAX_TID_COUNT
)) {
2013 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid
);
2014 rs_tl_turn_on_agg(priv
, tid
, lq_sta
, sta
);
2016 #endif /*CONFIG_IWL4965_HT */
2017 lq_sta
->action_counter
= 0;
2018 rs_set_stay_in_table(0, lq_sta
);
2022 * Else, don't search for a new modulation mode.
2023 * Put new timestamp in stay-in-modulation-mode flush timer if:
2024 * 1) Not changing rates right now
2025 * 2) Not just finishing up a search
2026 * 3) flush timer is empty
2029 if ((!update_lq
) && (!done_search
) && (!lq_sta
->flush_timer
))
2030 lq_sta
->flush_timer
= jiffies
;
2034 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, index
, is_green
);
2036 sta
->last_txrate_idx
= i
;
2038 /* sta->txrate_idx is an index to A mode rates which start
2039 * at IWL_FIRST_OFDM_RATE
2041 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2042 sta
->txrate_idx
= i
- IWL_FIRST_OFDM_RATE
;
2044 sta
->txrate_idx
= i
;
2050 static void rs_initialize_lq(struct iwl_priv
*priv
,
2051 struct ieee80211_conf
*conf
,
2052 struct sta_info
*sta
)
2054 struct iwl4965_lq_sta
*lq_sta
;
2055 struct iwl4965_scale_tbl_info
*tbl
;
2059 u8 use_green
= rs_use_green(priv
, conf
);
2063 if (!sta
|| !sta
->rate_ctrl_priv
)
2066 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2067 i
= sta
->last_txrate_idx
;
2069 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2070 (priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
))
2073 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2075 if (!lq_sta
->search_better_tbl
)
2076 active_tbl
= lq_sta
->active_tbl
;
2078 active_tbl
= 1 - lq_sta
->active_tbl
;
2080 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2082 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2085 /* FIXME:RS: This is also wrong in 4965 */
2086 rate
= iwl4965_rates
[i
].plcp
;
2087 rate
|= RATE_MCS_ANT_B_MSK
;
2088 rate
&= ~RATE_MCS_ANT_A_MSK
;
2090 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2091 rate
|= RATE_MCS_CCK_MSK
;
2093 tbl
->ant_type
= ANT_B
;
2094 rs_get_tbl_info_from_mcs(rate
, priv
->band
, tbl
, &rate_idx
);
2095 if (!rs_is_valid_ant(valid_tx_ant
, tbl
->ant_type
))
2096 rs_toggle_antenna(valid_tx_ant
, &rate
, tbl
);
2098 rate
= rate_n_flags_from_tbl(tbl
, rate_idx
, use_green
);
2099 tbl
->current_rate
= rate
;
2100 rs_set_expected_tpt_table(lq_sta
, tbl
);
2101 rs_fill_link_cmd(NULL
, lq_sta
, rate
);
2102 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2107 static void rs_get_rate(void *priv_rate
, struct net_device
*dev
,
2108 struct ieee80211_supported_band
*sband
,
2109 struct sk_buff
*skb
,
2110 struct rate_selection
*sel
)
2114 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
2115 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2116 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2117 struct sta_info
*sta
;
2119 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
2120 struct iwl4965_lq_sta
*lq_sta
;
2122 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2126 sta
= sta_info_get(local
, hdr
->addr1
);
2128 /* Send management frames and broadcast/multicast data using lowest
2130 fc
= le16_to_cpu(hdr
->frame_control
);
2131 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
) ||
2132 !sta
|| !sta
->rate_ctrl_priv
) {
2133 sel
->rate
= rate_lowest(local
, sband
, sta
);
2137 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2138 i
= sta
->last_txrate_idx
;
2140 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
2141 !lq_sta
->ibss_sta_added
) {
2142 u8 sta_id
= iwl_find_station(priv
, hdr
->addr1
);
2143 DECLARE_MAC_BUF(mac
);
2145 if (sta_id
== IWL_INVALID_STATION
) {
2146 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2147 print_mac(mac
, hdr
->addr1
));
2148 sta_id
= iwl4965_add_station_flags(priv
, hdr
->addr1
,
2149 0, CMD_ASYNC
, NULL
);
2151 if ((sta_id
!= IWL_INVALID_STATION
)) {
2152 lq_sta
->lq
.sta_id
= sta_id
;
2153 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2154 lq_sta
->ibss_sta_added
= 1;
2155 rs_initialize_lq(priv
, conf
, sta
);
2157 if (!lq_sta
->ibss_sta_added
)
2162 if ((i
< 0) || (i
> IWL_RATE_COUNT
)) {
2163 sel
->rate
= rate_lowest(local
, sband
, sta
);
2167 sel
->rate
= &priv
->ieee_rates
[i
];
2172 static void *rs_alloc_sta(void *priv
, gfp_t gfp
)
2174 struct iwl4965_lq_sta
*lq_sta
;
2177 IWL_DEBUG_RATE("create station rate scale window\n");
2179 lq_sta
= kzalloc(sizeof(struct iwl4965_lq_sta
), gfp
);
2183 lq_sta
->lq
.sta_id
= 0xff;
2186 for (j
= 0; j
< LQ_SIZE
; j
++)
2187 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2188 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2193 static void rs_rate_init(void *priv_rate
, void *priv_sta
,
2194 struct ieee80211_local
*local
,
2195 struct sta_info
*sta
)
2198 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2199 struct ieee80211_supported_band
*sband
;
2200 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
2201 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2203 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
2205 lq_sta
->flush_timer
= 0;
2206 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2207 sta
->txrate_idx
= 3;
2208 for (j
= 0; j
< LQ_SIZE
; j
++)
2209 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2210 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2212 IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2213 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2214 * the lowest or the highest rate.. Could consider using RSSI from
2215 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2218 lq_sta
->ibss_sta_added
= 0;
2219 if (priv
->iw_mode
== IEEE80211_IF_TYPE_AP
) {
2220 u8 sta_id
= iwl_find_station(priv
, sta
->addr
);
2221 DECLARE_MAC_BUF(mac
);
2223 /* for IBSS the call are from tasklet */
2224 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2225 print_mac(mac
, sta
->addr
));
2227 if (sta_id
== IWL_INVALID_STATION
) {
2228 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2229 print_mac(mac
, sta
->addr
));
2230 sta_id
= iwl4965_add_station_flags(priv
, sta
->addr
,
2231 0, CMD_ASYNC
, NULL
);
2233 if ((sta_id
!= IWL_INVALID_STATION
)) {
2234 lq_sta
->lq
.sta_id
= sta_id
;
2235 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2237 /* FIXME: this is w/a remove it later */
2238 priv
->assoc_station_added
= 1;
2241 /* Find highest tx rate supported by hardware and destination station */
2242 for (i
= 0; i
< sband
->n_bitrates
; i
++)
2243 if (sta
->supp_rates
[sband
->band
] & BIT(i
))
2244 sta
->txrate_idx
= i
;
2246 sta
->last_txrate_idx
= sta
->txrate_idx
;
2247 /* WTF is with this bogus comment? A doesn't have cck rates */
2248 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2249 if (local
->hw
.conf
.channel
->band
== IEEE80211_BAND_5GHZ
)
2250 sta
->last_txrate_idx
+= IWL_FIRST_OFDM_RATE
;
2253 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2254 lq_sta
->active_legacy_rate
= priv
->active_rate
& ~(0x1000);
2255 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2256 lq_sta
->band
= priv
->band
;
2257 #ifdef CONFIG_IWL4965_HT
2259 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2260 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2262 lq_sta
->active_siso_rate
=
2263 priv
->current_ht_config
.supp_mcs_set
[0] << 1;
2264 lq_sta
->active_siso_rate
|=
2265 priv
->current_ht_config
.supp_mcs_set
[0] & 0x1;
2266 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2267 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2270 lq_sta
->active_mimo2_rate
=
2271 priv
->current_ht_config
.supp_mcs_set
[1] << 1;
2272 lq_sta
->active_mimo2_rate
|=
2273 priv
->current_ht_config
.supp_mcs_set
[1] & 0x1;
2274 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2275 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2277 lq_sta
->active_mimo3_rate
=
2278 priv
->current_ht_config
.supp_mcs_set
[2] << 1;
2279 lq_sta
->active_mimo3_rate
|=
2280 priv
->current_ht_config
.supp_mcs_set
[2] & 0x1;
2281 lq_sta
->active_mimo3_rate
&= ~((u16
)0x2);
2282 lq_sta
->active_mimo3_rate
<<= IWL_FIRST_OFDM_RATE
;
2284 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2285 lq_sta
->active_siso_rate
,
2286 lq_sta
->active_mimo2_rate
,
2287 lq_sta
->active_mimo3_rate
);
2289 /* These values will be overriden later */
2290 lq_sta
->lq
.general_params
.single_stream_ant_msk
= ANT_A
;
2291 lq_sta
->lq
.general_params
.dual_stream_ant_msk
= ANT_AB
;
2293 /* as default allow aggregation for all tids */
2294 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2295 #endif /*CONFIG_IWL4965_HT*/
2296 #ifdef CONFIG_MAC80211_DEBUGFS
2300 if (priv
->assoc_station_added
)
2301 priv
->lq_mngr
.lq_ready
= 1;
2303 rs_initialize_lq(priv
, conf
, sta
);
2306 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
2307 struct iwl4965_lq_sta
*lq_sta
,
2310 struct iwl4965_scale_tbl_info tbl_type
;
2313 int repeat_rate
= 0;
2314 u8 ant_toggle_cnt
= 0;
2315 u8 use_ht_possible
= 1;
2316 u8 valid_tx_ant
= 0;
2317 struct iwl_link_quality_cmd
*lq_cmd
= &lq_sta
->lq
;
2319 /* Override starting rate (index 0) if needed for debug purposes */
2320 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2322 /* Interpret new_rate (rate_n_flags) */
2323 memset(&tbl_type
, 0, sizeof(tbl_type
));
2324 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
,
2325 &tbl_type
, &rate_idx
);
2327 /* How many times should we repeat the initial rate? */
2328 if (is_legacy(tbl_type
.lq_type
)) {
2330 repeat_rate
= IWL_NUMBER_TRY
;
2332 repeat_rate
= IWL_HT_NUMBER_TRY
;
2335 lq_cmd
->general_params
.mimo_delimiter
=
2336 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2338 /* Fill 1st table entry (index 0) */
2339 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2341 if (num_of_ant(tbl_type
.ant_type
) == 1) {
2342 lq_cmd
->general_params
.single_stream_ant_msk
=
2344 } else if (num_of_ant(tbl_type
.ant_type
) == 2) {
2345 lq_cmd
->general_params
.dual_stream_ant_msk
=
2347 } /* otherwise we don't modify the existing value */
2353 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2355 /* Fill rest of rate table */
2356 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2357 /* Repeat initial/next rate.
2358 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2359 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2360 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2361 if (is_legacy(tbl_type
.lq_type
)) {
2362 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2365 rs_toggle_antenna(valid_tx_ant
,
2366 &new_rate
, &tbl_type
))
2370 /* Override next rate if needed for debug purposes */
2371 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2373 /* Fill next table entry */
2374 lq_cmd
->rs_table
[index
].rate_n_flags
=
2375 cpu_to_le32(new_rate
);
2380 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
, &tbl_type
,
2383 /* Indicate to uCode which entries might be MIMO.
2384 * If initial rate was MIMO, this will finally end up
2385 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2386 if (is_mimo(tbl_type
.lq_type
))
2387 lq_cmd
->general_params
.mimo_delimiter
= index
;
2390 new_rate
= rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2393 /* How many times should we repeat the next rate? */
2394 if (is_legacy(tbl_type
.lq_type
)) {
2395 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2398 rs_toggle_antenna(valid_tx_ant
,
2399 &new_rate
, &tbl_type
))
2402 repeat_rate
= IWL_NUMBER_TRY
;
2404 repeat_rate
= IWL_HT_NUMBER_TRY
;
2407 /* Don't allow HT rates after next pass.
2408 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2409 use_ht_possible
= 0;
2411 /* Override next rate if needed for debug purposes */
2412 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2414 /* Fill next table entry */
2415 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2421 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2422 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2425 static void *rs_alloc(struct ieee80211_local
*local
)
2427 return local
->hw
.priv
;
2429 /* rate scale requires free function to be implemented */
2430 static void rs_free(void *priv_rate
)
2435 static void rs_clear(void *priv_rate
)
2437 struct iwl_priv
*priv
= (struct iwl_priv
*) priv_rate
;
2439 IWL_DEBUG_RATE("enter\n");
2441 priv
->lq_mngr
.lq_ready
= 0;
2443 IWL_DEBUG_RATE("leave\n");
2446 static void rs_free_sta(void *priv
, void *priv_sta
)
2448 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2450 IWL_DEBUG_RATE("enter\n");
2452 IWL_DEBUG_RATE("leave\n");
2456 #ifdef CONFIG_MAC80211_DEBUGFS
2457 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2459 file
->private_data
= inode
->i_private
;
2462 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
2463 u32
*rate_n_flags
, int index
)
2465 if (lq_sta
->dbg_fixed_rate
) {
2467 *rate_n_flags
= lq_sta
->dbg_fixed_rate
;
2469 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2470 *rate_n_flags
= 0x800D;
2472 *rate_n_flags
= 0x820A;
2474 IWL_DEBUG_RATE("Fixed rate ON\n");
2476 IWL_DEBUG_RATE("Fixed rate OFF\n");
2480 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2481 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2483 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2488 memset(buf
, 0, sizeof(buf
));
2489 buf_size
= min(count
, sizeof(buf
) - 1);
2490 if (copy_from_user(buf
, user_buf
, buf_size
))
2493 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2494 lq_sta
->dbg_fixed_rate
= parsed_rate
;
2496 lq_sta
->dbg_fixed_rate
= 0;
2498 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2499 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2500 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2501 lq_sta
->active_mimo3_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2503 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2504 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed_rate
);
2506 if (lq_sta
->dbg_fixed_rate
) {
2507 rs_fill_link_cmd(NULL
, lq_sta
, lq_sta
->dbg_fixed_rate
);
2508 iwl_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2514 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2515 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2521 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2523 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2524 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2525 lq_sta
->total_failed
, lq_sta
->total_success
,
2526 lq_sta
->active_legacy_rate
);
2527 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2528 lq_sta
->dbg_fixed_rate
);
2529 desc
+= sprintf(buff
+desc
, "general:"
2530 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2531 lq_sta
->lq
.general_params
.flags
,
2532 lq_sta
->lq
.general_params
.mimo_delimiter
,
2533 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2534 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2536 desc
+= sprintf(buff
+desc
, "agg:"
2537 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2538 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2539 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2540 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2542 desc
+= sprintf(buff
+desc
,
2543 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2544 lq_sta
->lq
.general_params
.start_rate_index
[0],
2545 lq_sta
->lq
.general_params
.start_rate_index
[1],
2546 lq_sta
->lq
.general_params
.start_rate_index
[2],
2547 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2550 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
2551 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X\n",
2552 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2554 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2557 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2558 .write
= rs_sta_dbgfs_scale_table_write
,
2559 .read
= rs_sta_dbgfs_scale_table_read
,
2560 .open
= open_file_generic
,
2562 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2563 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2569 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2570 for (i
= 0; i
< LQ_SIZE
; i
++) {
2571 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2573 lq_sta
->active_tbl
== i
?"*":"x",
2574 lq_sta
->lq_info
[i
].lq_type
,
2575 lq_sta
->lq_info
[i
].is_SGI
,
2576 lq_sta
->lq_info
[i
].is_fat
,
2577 lq_sta
->lq_info
[i
].is_dup
,
2578 lq_sta
->lq_info
[i
].current_rate
);
2579 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2580 desc
+= sprintf(buff
+desc
,
2581 "counter=%d success=%d %%=%d\n",
2582 lq_sta
->lq_info
[i
].win
[j
].counter
,
2583 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2584 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2587 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2590 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2591 .read
= rs_sta_dbgfs_stats_table_read
,
2592 .open
= open_file_generic
,
2595 static void rs_add_debugfs(void *priv
, void *priv_sta
,
2598 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2599 lq_sta
->rs_sta_dbgfs_scale_table_file
=
2600 debugfs_create_file("rate_scale_table", 0600, dir
,
2601 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
2602 lq_sta
->rs_sta_dbgfs_stats_table_file
=
2603 debugfs_create_file("rate_stats_table", 0600, dir
,
2604 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
2605 #ifdef CONFIG_IWL4965_HT
2606 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
2607 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
2608 &lq_sta
->tx_agg_tid_en
);
2613 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
2615 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2616 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
2617 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
2618 #ifdef CONFIG_IWL4965_HT
2619 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
2624 static struct rate_control_ops rs_ops
= {
2627 .tx_status
= rs_tx_status
,
2628 .get_rate
= rs_get_rate
,
2629 .rate_init
= rs_rate_init
,
2633 .alloc_sta
= rs_alloc_sta
,
2634 .free_sta
= rs_free_sta
,
2635 #ifdef CONFIG_MAC80211_DEBUGFS
2636 .add_sta_debugfs
= rs_add_debugfs
,
2637 .remove_sta_debugfs
= rs_remove_debugfs
,
2641 int iwl4965_fill_rs_info(struct ieee80211_hw
*hw
, char *buf
, u8 sta_id
)
2643 struct ieee80211_local
*local
= hw_to_local(hw
);
2644 struct iwl_priv
*priv
= hw
->priv
;
2645 struct iwl4965_lq_sta
*lq_sta
;
2646 struct sta_info
*sta
;
2648 u32 samples
= 0, success
= 0, good
= 0;
2649 unsigned long now
= jiffies
;
2651 u8 lq_type
, antenna
;
2655 sta
= sta_info_get(local
, priv
->stations
[sta_id
].sta
.sta
.addr
);
2656 if (!sta
|| !sta
->rate_ctrl_priv
) {
2658 IWL_DEBUG_RATE("leave - no private rate data!\n");
2660 IWL_DEBUG_RATE("leave - no station!\n");
2662 return sprintf(buf
, "station %d not found\n", sta_id
);
2665 lq_sta
= (void *)sta
->rate_ctrl_priv
;
2667 lq_type
= lq_sta
->lq_info
[lq_sta
->active_tbl
].lq_type
;
2668 antenna
= lq_sta
->lq_info
[lq_sta
->active_tbl
].ant_type
;
2670 if (is_legacy(lq_type
))
2671 i
= IWL_RATE_54M_INDEX
;
2673 i
= IWL_RATE_60M_INDEX
;
2677 int active
= lq_sta
->active_tbl
;
2680 sprintf(&buf
[cnt
], " %2dMbs: ", iwl4965_rates
[i
].ieee
/ 2);
2682 mask
= (1ULL << (IWL_RATE_MAX_WINDOW
- 1));
2683 for (j
= 0; j
< IWL_RATE_MAX_WINDOW
; j
++, mask
>>= 1)
2685 (lq_sta
->lq_info
[active
].win
[i
].data
& mask
)
2688 samples
+= lq_sta
->lq_info
[active
].win
[i
].counter
;
2689 good
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
;
2690 success
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
*
2691 iwl4965_rates
[i
].ieee
;
2693 if (lq_sta
->lq_info
[active
].win
[i
].stamp
) {
2695 jiffies_to_msecs(now
-
2696 lq_sta
->lq_info
[active
].win
[i
].stamp
);
2698 if (delta
> max_time
)
2701 cnt
+= sprintf(&buf
[cnt
], "%5dms\n", delta
);
2705 j
= iwl4965_get_prev_ieee_rate(i
);
2711 /* Display the average rate of all samples taken.
2713 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2714 * added from iwl4965_rates is actually 2X the rate */
2716 cnt
+= sprintf(&buf
[cnt
],
2717 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2718 "%3d%% success (%d good packets over %d tries)\n",
2719 success
/ (2 * samples
), (success
* 5 / samples
) % 10,
2720 max_time
, good
* 100 / samples
, good
, samples
);
2722 cnt
+= sprintf(&buf
[cnt
], "\nAverage rate: 0Mbs\n");
2724 cnt
+= sprintf(&buf
[cnt
], "\nrate scale type %d antenna %d "
2725 "active_search %d rate index %d\n", lq_type
, antenna
,
2726 lq_sta
->search_better_tbl
, sta
->last_txrate_idx
);
2732 void iwl4965_rate_scale_init(struct ieee80211_hw
*hw
, s32 sta_id
)
2734 struct iwl_priv
*priv
= hw
->priv
;
2736 priv
->lq_mngr
.lq_ready
= 1;
2739 int iwl4965_rate_control_register(void)
2741 return ieee80211_rate_control_register(&rs_ops
);
2744 void iwl4965_rate_control_unregister(void)
2746 ieee80211_rate_control_unregister(&rs_ops
);