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>
31 #include <net/ieee80211.h>
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
37 #include <linux/workqueue.h>
39 #include "../net/mac80211/rate.h"
43 #include "iwl-helpers.h"
45 #define RS_NAME "iwl-4965-rs"
47 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
48 #define IWL_NUMBER_TRY 1
49 #define IWL_HT_NUMBER_TRY 3
51 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
52 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
53 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
58 static u8 rs_ht_to_legacy
[] = {
59 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
60 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
62 IWL_RATE_6M_INDEX
, IWL_RATE_9M_INDEX
,
63 IWL_RATE_12M_INDEX
, IWL_RATE_18M_INDEX
,
64 IWL_RATE_24M_INDEX
, IWL_RATE_36M_INDEX
,
65 IWL_RATE_48M_INDEX
, IWL_RATE_54M_INDEX
70 } __attribute__ ((packed
));
73 * struct iwl4965_rate_scale_data -- tx success history for one rate
75 struct iwl4965_rate_scale_data
{
76 u64 data
; /* bitmap of successful frames */
77 s32 success_counter
; /* number of frames successful */
78 s32 success_ratio
; /* per-cent * 128 */
79 s32 counter
; /* number of frames attempted */
80 s32 average_tpt
; /* success ratio * expected throughput */
85 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
87 * There are two of these in struct iwl4965_lq_sta,
88 * one for "active", and one for "search".
90 struct iwl4965_scale_tbl_info
{
91 enum iwl4965_table_type lq_type
;
92 enum iwl4965_antenna_type antenna_type
;
93 u8 is_SGI
; /* 1 = short guard interval */
94 u8 is_fat
; /* 1 = 40 MHz channel width */
95 u8 is_dup
; /* 1 = duplicated data streams */
96 u8 action
; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
97 s32
*expected_tpt
; /* throughput metrics; expected_tpt_G, etc. */
98 struct iwl4965_rate current_rate
; /* rate_n_flags, uCode API format */
99 struct iwl4965_rate_scale_data win
[IWL_RATE_COUNT
]; /* rate histories */
102 #ifdef CONFIG_IWL4965_HT
104 struct iwl4965_traffic_load
{
105 unsigned long time_stamp
; /* age of the oldest statistics */
106 u32 packet_count
[TID_QUEUE_MAX_SIZE
]; /* packet count in this time
108 u32 total
; /* total num of packets during the
109 * last TID_MAX_TIME_DIFF */
110 u8 queue_count
; /* number of queues that has
111 * been used since the last cleanup */
112 u8 head
; /* start of the circular buffer */
115 #endif /* CONFIG_IWL4965_HT */
118 * struct iwl4965_lq_sta -- driver's rate scaling private structure
120 * Pointer to this gets passed back and forth between driver and mac80211.
122 struct iwl4965_lq_sta
{
123 u8 active_tbl
; /* index of active table, range 0-1 */
124 u8 enable_counter
; /* indicates HT mode */
125 u8 stay_in_tbl
; /* 1: disallow, 0: allow search for new mode */
126 u8 search_better_tbl
; /* 1: currently trying alternate mode */
129 /* The following determine when to search for a new mode */
130 u32 table_count_limit
;
131 u32 max_failure_limit
; /* # failed frames before new search */
132 u32 max_success_limit
; /* # successful frames before new search */
134 u32 total_failed
; /* total failed frames, any/all rates */
135 u32 total_success
; /* total successful frames, any/all rates */
136 u32 flush_timer
; /* time staying in mode before new search */
138 u8 action_counter
; /* # mode-switch actions tried */
143 enum ieee80211_band band
;
146 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
149 u16 active_siso_rate
;
150 u16 active_mimo_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
;
167 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(struct iwl4965_lq_sta
*lq_sta
,
175 struct iwl4965_rate
*tx_mcs
,
176 struct iwl_link_quality_cmd
*tbl
);
179 #ifdef CONFIG_MAC80211_DEBUGFS
180 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
181 struct iwl4965_rate
*mcs
, int index
);
183 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
184 struct iwl4965_rate
*mcs
, int index
)
189 * Expected throughput metrics for following rates:
190 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
191 * "G" is the only table that supports CCK (the first 4 rates).
193 static s32 expected_tpt_A
[IWL_RATE_COUNT
] = {
194 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
197 static s32 expected_tpt_G
[IWL_RATE_COUNT
] = {
198 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
201 static s32 expected_tpt_siso20MHz
[IWL_RATE_COUNT
] = {
202 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
205 static s32 expected_tpt_siso20MHzSGI
[IWL_RATE_COUNT
] = {
206 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
209 static s32 expected_tpt_mimo20MHz
[IWL_RATE_COUNT
] = {
210 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
213 static s32 expected_tpt_mimo20MHzSGI
[IWL_RATE_COUNT
] = {
214 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
217 static s32 expected_tpt_siso40MHz
[IWL_RATE_COUNT
] = {
218 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
221 static s32 expected_tpt_siso40MHzSGI
[IWL_RATE_COUNT
] = {
222 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
225 static s32 expected_tpt_mimo40MHz
[IWL_RATE_COUNT
] = {
226 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
229 static s32 expected_tpt_mimo40MHzSGI
[IWL_RATE_COUNT
] = {
230 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
233 static inline u8
iwl4965_rate_get_rate(u32 rate_n_flags
)
235 return (u8
)(rate_n_flags
& 0xFF);
238 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data
*window
)
241 window
->success_counter
= 0;
242 window
->success_ratio
= IWL_INVALID_VALUE
;
244 window
->average_tpt
= IWL_INVALID_VALUE
;
248 #ifdef CONFIG_IWL4965_HT
250 * removes the old data from the statistics. All data that is older than
251 * TID_MAX_TIME_DIFF, will be deleted.
253 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load
*tl
, u32 curr_time
)
255 /* The oldest age we want to keep */
256 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
258 while (tl
->queue_count
&&
259 (tl
->time_stamp
< oldest_time
)) {
260 tl
->total
-= tl
->packet_count
[tl
->head
];
261 tl
->packet_count
[tl
->head
] = 0;
262 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
265 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
271 * increment traffic load value for tid and also remove
272 * any old values if passed the certain time period
274 static void rs_tl_add_packet(struct iwl4965_lq_sta
*lq_data
, u8 tid
)
276 u32 curr_time
= jiffies_to_msecs(jiffies
);
279 struct iwl4965_traffic_load
*tl
= NULL
;
281 if (tid
>= TID_MAX_LOAD_COUNT
)
284 tl
= &lq_data
->load
[tid
];
286 curr_time
-= curr_time
% TID_ROUND_VALUE
;
288 /* Happens only for the first packet. Initialize the data */
289 if (!(tl
->queue_count
)) {
291 tl
->time_stamp
= curr_time
;
294 tl
->packet_count
[0] = 1;
298 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
299 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
301 /* The history is too long: remove data that is older than */
302 /* TID_MAX_TIME_DIFF */
303 if (index
>= TID_QUEUE_MAX_SIZE
)
304 rs_tl_rm_old_stats(tl
, curr_time
);
306 index
= (tl
->head
+ index
) % TID_QUEUE_MAX_SIZE
;
307 tl
->packet_count
[index
] = tl
->packet_count
[index
] + 1;
308 tl
->total
= tl
->total
+ 1;
310 if ((index
+ 1) > tl
->queue_count
)
311 tl
->queue_count
= index
+ 1;
315 get the traffic load value for tid
317 static u32
rs_tl_get_load(struct iwl4965_lq_sta
*lq_data
, u8 tid
)
319 u32 curr_time
= jiffies_to_msecs(jiffies
);
322 struct iwl4965_traffic_load
*tl
= NULL
;
324 if (tid
>= TID_MAX_LOAD_COUNT
)
327 tl
= &(lq_data
->load
[tid
]);
329 curr_time
-= curr_time
% TID_ROUND_VALUE
;
331 if (!(tl
->queue_count
))
334 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
335 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
337 /* The history is too long: remove data that is older than */
338 /* TID_MAX_TIME_DIFF */
339 if (index
>= TID_QUEUE_MAX_SIZE
)
340 rs_tl_rm_old_stats(tl
, curr_time
);
345 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv
*priv
,
346 struct iwl4965_lq_sta
*lq_data
, u8 tid
,
347 struct sta_info
*sta
)
350 DECLARE_MAC_BUF(mac
);
352 spin_lock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
353 state
= sta
->ampdu_mlme
.tid_state_tx
[tid
];
354 spin_unlock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
356 if (state
== HT_AGG_STATE_IDLE
&&
357 rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
358 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
359 print_mac(mac
, sta
->addr
), tid
);
360 ieee80211_start_tx_ba_session(priv
->hw
, sta
->addr
, tid
);
364 static void rs_tl_turn_on_agg(struct iwl_priv
*priv
, u8 tid
,
365 struct iwl4965_lq_sta
*lq_data
,
366 struct sta_info
*sta
)
368 if ((tid
< TID_MAX_LOAD_COUNT
))
369 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
370 else if (tid
== IWL_AGG_ALL_TID
)
371 for (tid
= 0; tid
< TID_MAX_LOAD_COUNT
; tid
++)
372 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
375 #endif /* CONFIG_IWLWIFI_HT */
378 * rs_collect_tx_data - Update the success/failure sliding window
380 * We keep a sliding window of the last 62 packets transmitted
381 * at this rate. window->data contains the bitmask of successful
384 static int rs_collect_tx_data(struct iwl4965_rate_scale_data
*windows
,
385 int scale_index
, s32 tpt
, int retries
,
388 struct iwl4965_rate_scale_data
*window
= NULL
;
390 u8 win_size
= IWL_RATE_MAX_WINDOW
;
393 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
396 /* Select data for current tx bit rate */
397 window
= &(windows
[scale_index
]);
400 * Keep track of only the latest 62 tx frame attempts in this rate's
401 * history window; anything older isn't really relevant any more.
402 * If we have filled up the sliding window, drop the oldest attempt;
403 * if the oldest attempt (highest bit in bitmap) shows "success",
404 * subtract "1" from the success counter (this is the main reason
405 * we keep these bitmaps!).
407 while (retries
> 0) {
408 if (window
->counter
>= win_size
) {
409 window
->counter
= win_size
- 1;
411 mask
= (mask
<< (win_size
- 1));
412 if (window
->data
& mask
) {
413 window
->data
&= ~mask
;
414 window
->success_counter
=
415 window
->success_counter
- 1;
419 /* Increment frames-attempted counter */
422 /* Shift bitmap by one frame (throw away oldest history),
423 * OR in "1", and increment "success" if this
424 * frame was successful. */
426 window
->data
= (mask
<< 1);
428 window
->success_counter
= window
->success_counter
+ 1;
436 /* Calculate current success ratio, avoid divide-by-0! */
437 if (window
->counter
> 0)
438 window
->success_ratio
= 128 * (100 * window
->success_counter
)
441 window
->success_ratio
= IWL_INVALID_VALUE
;
443 fail_count
= window
->counter
- window
->success_counter
;
445 /* Calculate average throughput, if we have enough history. */
446 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
447 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
448 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
450 window
->average_tpt
= IWL_INVALID_VALUE
;
452 /* Tag this window as having been updated */
453 window
->stamp
= jiffies
;
459 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
461 static void rs_mcs_from_tbl(struct iwl4965_rate
*mcs_rate
,
462 struct iwl4965_scale_tbl_info
*tbl
,
463 int index
, u8 use_green
)
465 if (is_legacy(tbl
->lq_type
)) {
466 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp
;
467 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
468 mcs_rate
->rate_n_flags
|= RATE_MCS_CCK_MSK
;
470 } else if (is_siso(tbl
->lq_type
)) {
471 if (index
> IWL_LAST_OFDM_RATE
)
472 index
= IWL_LAST_OFDM_RATE
;
473 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp_siso
|
476 if (index
> IWL_LAST_OFDM_RATE
)
477 index
= IWL_LAST_OFDM_RATE
;
478 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp_mimo
|
482 switch (tbl
->antenna_type
) {
484 mcs_rate
->rate_n_flags
|= RATE_MCS_ANT_AB_MSK
;
487 mcs_rate
->rate_n_flags
|= RATE_MCS_ANT_A_MSK
;
490 mcs_rate
->rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
496 if (is_legacy(tbl
->lq_type
))
501 mcs_rate
->rate_n_flags
|= RATE_MCS_DUP_MSK
;
503 mcs_rate
->rate_n_flags
|= RATE_MCS_FAT_MSK
;
506 mcs_rate
->rate_n_flags
|= RATE_MCS_SGI_MSK
;
509 mcs_rate
->rate_n_flags
|= RATE_MCS_GF_MSK
;
510 if (is_siso(tbl
->lq_type
))
511 mcs_rate
->rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
516 * Interpret uCode API's rate_n_flags format,
517 * fill "search" or "active" tx mode table.
519 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate
*mcs_rate
,
520 enum ieee80211_band band
,
521 struct iwl4965_scale_tbl_info
*tbl
,
527 index
= iwl4965_hwrate_to_plcp_idx(mcs_rate
->rate_n_flags
);
529 if (index
== IWL_RATE_INVALID
) {
533 tbl
->is_SGI
= 0; /* default legacy setup */
536 tbl
->antenna_type
= ANT_BOTH
; /* default MIMO setup */
538 /* legacy rate format */
539 if (!(mcs_rate
->rate_n_flags
& RATE_MCS_HT_MSK
)) {
540 ant_msk
= (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_AB_MSK
);
542 if (ant_msk
== RATE_MCS_ANT_AB_MSK
)
543 tbl
->lq_type
= LQ_NONE
;
546 if (band
== IEEE80211_BAND_5GHZ
)
551 if (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_A_MSK
)
552 tbl
->antenna_type
= ANT_MAIN
;
554 tbl
->antenna_type
= ANT_AUX
;
558 /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
559 } else if (iwl4965_rate_get_rate(mcs_rate
->rate_n_flags
)
560 <= IWL_RATE_SISO_60M_PLCP
) {
561 tbl
->lq_type
= LQ_SISO
;
563 ant_msk
= (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_AB_MSK
);
564 if (ant_msk
== RATE_MCS_ANT_AB_MSK
)
565 tbl
->lq_type
= LQ_NONE
;
567 if (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_A_MSK
)
568 tbl
->antenna_type
= ANT_MAIN
;
570 tbl
->antenna_type
= ANT_AUX
;
572 if (mcs_rate
->rate_n_flags
& RATE_MCS_SGI_MSK
)
575 if ((mcs_rate
->rate_n_flags
& RATE_MCS_FAT_MSK
) ||
576 (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
))
579 if (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
)
584 /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
586 tbl
->lq_type
= LQ_MIMO
;
587 if (mcs_rate
->rate_n_flags
& RATE_MCS_SGI_MSK
)
590 if ((mcs_rate
->rate_n_flags
& RATE_MCS_FAT_MSK
) ||
591 (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
))
594 if (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
)
601 static inline void rs_toggle_antenna(struct iwl4965_rate
*new_rate
,
602 struct iwl4965_scale_tbl_info
*tbl
)
604 if (tbl
->antenna_type
== ANT_AUX
) {
605 tbl
->antenna_type
= ANT_MAIN
;
606 new_rate
->rate_n_flags
&= ~RATE_MCS_ANT_B_MSK
;
607 new_rate
->rate_n_flags
|= RATE_MCS_ANT_A_MSK
;
609 tbl
->antenna_type
= ANT_AUX
;
610 new_rate
->rate_n_flags
&= ~RATE_MCS_ANT_A_MSK
;
611 new_rate
->rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
615 static inline u8
rs_use_green(struct iwl_priv
*priv
,
616 struct ieee80211_conf
*conf
)
618 #ifdef CONFIG_IWL4965_HT
619 return ((conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) &&
620 priv
->current_ht_config
.is_green_field
&&
621 !priv
->current_ht_config
.non_GF_STA_present
);
622 #endif /* CONFIG_IWL4965_HT */
627 * rs_get_supported_rates - get the available rates
629 * if management frame or broadcast frame only return
630 * basic available rates.
633 static void rs_get_supported_rates(struct iwl4965_lq_sta
*lq_sta
,
634 struct ieee80211_hdr
*hdr
,
635 enum iwl4965_table_type rate_type
,
638 if (is_legacy(rate_type
))
639 *data_rate
= lq_sta
->active_rate
;
641 if (is_siso(rate_type
))
642 *data_rate
= lq_sta
->active_siso_rate
;
644 *data_rate
= lq_sta
->active_mimo_rate
;
647 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
648 lq_sta
->active_rate_basic
) {
649 *data_rate
= lq_sta
->active_rate_basic
;
653 static u16
rs_get_adjacent_rate(u8 index
, u16 rate_mask
, int rate_type
)
655 u8 high
= IWL_RATE_INVALID
;
656 u8 low
= IWL_RATE_INVALID
;
658 /* 802.11A or ht walks to the next literal adjacent rate in
660 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
664 /* Find the previous rate that is in the rate mask */
666 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
667 if (rate_mask
& mask
) {
673 /* Find the next rate that is in the rate mask */
675 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
676 if (rate_mask
& mask
) {
682 return (high
<< 8) | low
;
686 while (low
!= IWL_RATE_INVALID
) {
687 low
= iwl4965_rates
[low
].prev_rs
;
688 if (low
== IWL_RATE_INVALID
)
690 if (rate_mask
& (1 << low
))
692 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low
);
696 while (high
!= IWL_RATE_INVALID
) {
697 high
= iwl4965_rates
[high
].next_rs
;
698 if (high
== IWL_RATE_INVALID
)
700 if (rate_mask
& (1 << high
))
702 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high
);
705 return (high
<< 8) | low
;
708 static void rs_get_lower_rate(struct iwl4965_lq_sta
*lq_sta
,
709 struct iwl4965_scale_tbl_info
*tbl
, u8 scale_index
,
710 u8 ht_possible
, struct iwl4965_rate
*mcs_rate
)
715 u8 switch_to_legacy
= 0;
716 u8 is_green
= lq_sta
->is_green
;
718 /* check if we need to switch from HT to legacy rates.
719 * assumption is that mandatory rates (1Mbps or 6Mbps)
720 * are always supported (spec demand) */
721 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
722 switch_to_legacy
= 1;
723 scale_index
= rs_ht_to_legacy
[scale_index
];
724 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
729 if ((tbl
->antenna_type
== ANT_BOTH
) ||
730 (tbl
->antenna_type
== ANT_NONE
))
731 tbl
->antenna_type
= ANT_MAIN
;
737 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
, &rate_mask
);
739 /* Mask with station rate restriction */
740 if (is_legacy(tbl
->lq_type
)) {
741 /* supp_rates has no CCK bits in A mode */
742 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
743 rate_mask
= (u16
)(rate_mask
&
744 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
746 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
749 /* If we switched from HT to legacy, check current rate */
750 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
751 rs_mcs_from_tbl(mcs_rate
, tbl
, scale_index
, is_green
);
755 high_low
= rs_get_adjacent_rate(scale_index
, rate_mask
, tbl
->lq_type
);
756 low
= high_low
& 0xff;
758 if (low
!= IWL_RATE_INVALID
)
759 rs_mcs_from_tbl(mcs_rate
, tbl
, low
, is_green
);
761 rs_mcs_from_tbl(mcs_rate
, tbl
, scale_index
, is_green
);
765 * mac80211 sends us Tx status
767 static void rs_tx_status(void *priv_rate
, struct net_device
*dev
,
769 struct ieee80211_tx_status
*tx_resp
)
773 int rs_index
, index
= 0;
774 struct iwl4965_lq_sta
*lq_sta
;
775 struct iwl_link_quality_cmd
*table
;
776 struct sta_info
*sta
;
777 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
778 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
779 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
780 struct ieee80211_hw
*hw
= local_to_hw(local
);
781 struct iwl4965_rate_scale_data
*window
= NULL
;
782 struct iwl4965_rate_scale_data
*search_win
= NULL
;
783 struct iwl4965_rate tx_mcs
;
784 struct iwl4965_scale_tbl_info tbl_type
;
785 struct iwl4965_scale_tbl_info
*curr_tbl
, *search_tbl
;
787 u16 fc
= le16_to_cpu(hdr
->frame_control
);
790 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
792 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
))
795 /* This packet was aggregated but doesn't carry rate scale info */
796 if ((tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
) &&
797 !(tx_resp
->flags
& IEEE80211_TX_STATUS_AMPDU
))
800 retries
= tx_resp
->retry_count
;
807 sta
= sta_info_get(local
, hdr
->addr1
);
809 if (!sta
|| !sta
->rate_ctrl_priv
)
813 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
815 if (!priv
->lq_mngr
.lq_ready
)
818 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
819 !lq_sta
->ibss_sta_added
)
823 active_index
= lq_sta
->active_tbl
;
825 /* Get mac80211 antenna info */
827 (lq_sta
->valid_antenna
& local
->hw
.conf
.antenna_sel_tx
);
828 if (!lq_sta
->antenna
)
829 lq_sta
->antenna
= lq_sta
->valid_antenna
;
831 /* Ignore mac80211 antenna info for now */
832 lq_sta
->antenna
= lq_sta
->valid_antenna
;
834 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
835 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
836 window
= (struct iwl4965_rate_scale_data
*)
838 search_win
= (struct iwl4965_rate_scale_data
*)
839 &(search_tbl
->win
[0]);
842 * Ignore this Tx frame response if its initial rate doesn't match
843 * that of latest Link Quality command. There may be stragglers
844 * from a previous Link Quality command, but we're no longer interested
845 * in those; they're either from the "active" mode while we're trying
846 * to check "search" mode, or a prior "search" mode after we've moved
847 * to a new "search" mode (which might become the new "active" mode).
849 tx_mcs
.rate_n_flags
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
850 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->band
, &tbl_type
, &rs_index
);
851 if (priv
->band
== IEEE80211_BAND_5GHZ
)
852 rs_index
-= IWL_FIRST_OFDM_RATE
;
854 if ((tx_resp
->control
.tx_rate
== NULL
) ||
856 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_SHORT_GI
)) ||
858 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_40_MHZ_WIDTH
)) ||
860 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_DUP_DATA
)) ||
861 (tbl_type
.antenna_type
^
862 tx_resp
->control
.antenna_sel_tx
) ||
863 (!!(tx_mcs
.rate_n_flags
& RATE_MCS_HT_MSK
) ^
864 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_OFDM_HT
)) ||
865 (!!(tx_mcs
.rate_n_flags
& RATE_MCS_GF_MSK
) ^
866 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_GREEN_FIELD
)) ||
867 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
868 tx_resp
->control
.tx_rate
->bitrate
)) {
869 IWL_DEBUG_RATE("initial rate does not match 0x%x\n",
870 tx_mcs
.rate_n_flags
);
874 /* Update frame history window with "failure" for each Tx retry. */
876 /* Look up the rate and other info used for each tx attempt.
877 * Each tx attempt steps one entry deeper in the rate table. */
878 tx_mcs
.rate_n_flags
=
879 le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
880 rs_get_tbl_info_from_mcs(&tx_mcs
, 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
.antenna_type
== search_tbl
->antenna_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
.antenna_type
== curr_tbl
->antenna_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_mcs
.rate_n_flags
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
921 rs_get_tbl_info_from_mcs(&tx_mcs
, 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
.antenna_type
== search_tbl
->antenna_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
.antenna_type
== curr_tbl
->antenna_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
);
985 static u8
rs_is_ant_connected(u8 valid_antenna
,
986 enum iwl4965_antenna_type antenna_type
)
988 if (antenna_type
== ANT_AUX
)
989 return ((valid_antenna
& 0x2) ? 1:0);
990 else if (antenna_type
== ANT_MAIN
)
991 return ((valid_antenna
& 0x1) ? 1:0);
992 else if (antenna_type
== ANT_BOTH
)
993 return ((valid_antenna
& 0x3) == 0x3);
998 static u8
rs_is_other_ant_connected(u8 valid_antenna
,
999 enum iwl4965_antenna_type antenna_type
)
1001 if (antenna_type
== ANT_AUX
)
1002 return rs_is_ant_connected(valid_antenna
, ANT_MAIN
);
1004 return rs_is_ant_connected(valid_antenna
, ANT_AUX
);
1010 * Begin a period of staying with a selected modulation mode.
1011 * Set "stay_in_tbl" flag to prevent any mode switches.
1012 * Set frame tx success limits according to legacy vs. high-throughput,
1013 * and reset overall (spanning all rates) tx success history statistics.
1014 * These control how long we stay using same modulation mode before
1015 * searching for a new mode.
1017 static void rs_set_stay_in_table(u8 is_legacy
,
1018 struct iwl4965_lq_sta
*lq_sta
)
1020 IWL_DEBUG_HT("we are staying in the same table\n");
1021 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
1023 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
1024 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
1025 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
1027 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
1028 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
1029 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
1031 lq_sta
->table_count
= 0;
1032 lq_sta
->total_failed
= 0;
1033 lq_sta
->total_success
= 0;
1037 * Find correct throughput table for given mode of modulation
1039 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta
*lq_sta
,
1040 struct iwl4965_scale_tbl_info
*tbl
)
1042 if (is_legacy(tbl
->lq_type
)) {
1043 if (!is_a_band(tbl
->lq_type
))
1044 tbl
->expected_tpt
= expected_tpt_G
;
1046 tbl
->expected_tpt
= expected_tpt_A
;
1047 } else if (is_siso(tbl
->lq_type
)) {
1048 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1050 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
1052 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
1053 else if (tbl
->is_SGI
)
1054 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
1056 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1058 } else if (is_mimo(tbl
->lq_type
)) {
1059 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1061 tbl
->expected_tpt
= expected_tpt_mimo40MHzSGI
;
1063 tbl
->expected_tpt
= expected_tpt_mimo40MHz
;
1064 else if (tbl
->is_SGI
)
1065 tbl
->expected_tpt
= expected_tpt_mimo20MHzSGI
;
1067 tbl
->expected_tpt
= expected_tpt_mimo20MHz
;
1069 tbl
->expected_tpt
= expected_tpt_G
;
1072 #ifdef CONFIG_IWL4965_HT
1074 * Find starting rate for new "search" high-throughput mode of modulation.
1075 * Goal is to find lowest expected rate (under perfect conditions) that is
1076 * above the current measured throughput of "active" mode, to give new mode
1077 * a fair chance to prove itself without too many challenges.
1079 * This gets called when transitioning to more aggressive modulation
1080 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1081 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1082 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1083 * bit rate will typically need to increase, but not if performance was bad.
1085 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1086 struct iwl4965_lq_sta
*lq_sta
,
1087 struct iwl4965_scale_tbl_info
*tbl
, /* "search" */
1088 u16 rate_mask
, s8 index
, s8 rate
)
1090 /* "active" values */
1091 struct iwl4965_scale_tbl_info
*active_tbl
=
1092 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1093 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1094 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1096 /* expected "search" throughput */
1097 s32
*tpt_tbl
= tbl
->expected_tpt
;
1099 s32 new_rate
, high
, low
, start_hi
;
1102 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1105 high_low
= rs_get_adjacent_rate(rate
, rate_mask
, tbl
->lq_type
);
1107 low
= high_low
& 0xff;
1108 high
= (high_low
>> 8) & 0xff;
1111 * Lower the "search" bit rate, to give new "search" mode
1112 * approximately the same throughput as "active" if:
1114 * 1) "Active" mode has been working modestly well (but not
1115 * great), and expected "search" throughput (under perfect
1116 * conditions) at candidate rate is above the actual
1117 * measured "active" throughput (but less than expected
1118 * "active" throughput under perfect conditions).
1120 * 2) "Active" mode has been working perfectly or very well
1121 * and expected "search" throughput (under perfect
1122 * conditions) at candidate rate is above expected
1123 * "active" throughput (under perfect conditions).
1125 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1126 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1127 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1128 (tpt_tbl
[rate
] <= active_tpt
))) ||
1129 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1130 (tpt_tbl
[rate
] > active_tpt
))) {
1132 /* (2nd or later pass)
1133 * If we've already tried to raise the rate, and are
1134 * now trying to lower it, use the higher rate. */
1135 if (start_hi
!= IWL_RATE_INVALID
) {
1136 new_rate
= start_hi
;
1142 /* Loop again with lower rate */
1143 if (low
!= IWL_RATE_INVALID
)
1146 /* Lower rate not available, use the original */
1150 /* Else try to raise the "search" rate to match "active" */
1152 /* (2nd or later pass)
1153 * If we've already tried to lower the rate, and are
1154 * now trying to raise it, use the lower rate. */
1155 if (new_rate
!= IWL_RATE_INVALID
)
1158 /* Loop again with higher rate */
1159 else if (high
!= IWL_RATE_INVALID
) {
1163 /* Higher rate not available, use the original */
1172 #endif /* CONFIG_IWL4965_HT */
1174 static inline u8
rs_is_both_ant_supp(u8 valid_antenna
)
1176 return (rs_is_ant_connected(valid_antenna
, ANT_BOTH
));
1180 * Set up search table for MIMO
1182 static int rs_switch_to_mimo(struct iwl_priv
*priv
,
1183 struct iwl4965_lq_sta
*lq_sta
,
1184 struct ieee80211_conf
*conf
,
1185 struct sta_info
*sta
,
1186 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1188 #ifdef CONFIG_IWL4965_HT
1191 s8 is_green
= lq_sta
->is_green
;
1193 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1194 !sta
->ht_info
.ht_supported
)
1197 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1198 tbl
->lq_type
= LQ_MIMO
;
1199 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
,
1202 if (priv
->current_ht_config
.tx_mimo_ps_mode
== IWL_MIMO_PS_STATIC
)
1205 /* Need both Tx chains/antennas to support MIMO */
1206 if (!rs_is_both_ant_supp(lq_sta
->antenna
))
1209 tbl
->is_dup
= lq_sta
->is_dup
;
1211 if (priv
->current_ht_config
.supported_chan_width
1212 == IWL_CHANNEL_WIDTH_40MHZ
)
1218 if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_40MHZ_ONLY
)
1222 } else if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_20MHZ_ONLY
)
1227 rs_get_expected_tpt_table(lq_sta
, tbl
);
1229 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
, index
);
1231 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate
, rate_mask
);
1232 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
))
1234 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, rate
, is_green
);
1236 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1237 tbl
->current_rate
.rate_n_flags
, is_green
);
1241 #endif /*CONFIG_IWL4965_HT */
1245 * Set up search table for SISO
1247 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1248 struct iwl4965_lq_sta
*lq_sta
,
1249 struct ieee80211_conf
*conf
,
1250 struct sta_info
*sta
,
1251 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1253 #ifdef CONFIG_IWL4965_HT
1255 u8 is_green
= lq_sta
->is_green
;
1258 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1259 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1260 !sta
->ht_info
.ht_supported
)
1263 tbl
->is_dup
= lq_sta
->is_dup
;
1264 tbl
->lq_type
= LQ_SISO
;
1266 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
,
1269 if (priv
->current_ht_config
.supported_chan_width
1270 == IWL_CHANNEL_WIDTH_40MHZ
)
1276 if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_40MHZ_ONLY
)
1280 } else if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_20MHZ_ONLY
)
1288 rs_get_expected_tpt_table(lq_sta
, tbl
);
1289 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
, index
);
1291 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1292 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1293 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1297 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, rate
, is_green
);
1298 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1299 tbl
->current_rate
.rate_n_flags
, is_green
);
1304 #endif /*CONFIG_IWL4965_HT */
1308 * Try to switch to new modulation mode from legacy
1310 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1311 struct iwl4965_lq_sta
*lq_sta
,
1312 struct ieee80211_conf
*conf
,
1313 struct sta_info
*sta
,
1317 struct iwl4965_scale_tbl_info
*tbl
=
1318 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1319 struct iwl4965_scale_tbl_info
*search_tbl
=
1320 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1321 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1322 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1323 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1324 u8 start_action
= tbl
->action
;
1327 switch (tbl
->action
) {
1328 case IWL_LEGACY_SWITCH_ANTENNA
:
1329 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1331 search_tbl
->lq_type
= LQ_NONE
;
1332 lq_sta
->action_counter
++;
1334 /* Don't change antenna if success has been great */
1335 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1338 /* Don't change antenna if other one is not connected */
1339 if (!rs_is_other_ant_connected(lq_sta
->antenna
,
1343 /* Set up search table to try other antenna */
1344 memcpy(search_tbl
, tbl
, sz
);
1346 rs_toggle_antenna(&(search_tbl
->current_rate
),
1348 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1349 lq_sta
->search_better_tbl
= 1;
1352 case IWL_LEGACY_SWITCH_SISO
:
1353 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1355 /* Set up search table to try SISO */
1356 memcpy(search_tbl
, tbl
, sz
);
1357 search_tbl
->lq_type
= LQ_SISO
;
1358 search_tbl
->is_SGI
= 0;
1359 search_tbl
->is_fat
= 0;
1360 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1363 lq_sta
->search_better_tbl
= 1;
1364 lq_sta
->action_counter
= 0;
1369 case IWL_LEGACY_SWITCH_MIMO
:
1370 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1372 /* Set up search table to try MIMO */
1373 memcpy(search_tbl
, tbl
, sz
);
1374 search_tbl
->lq_type
= LQ_MIMO
;
1375 search_tbl
->is_SGI
= 0;
1376 search_tbl
->is_fat
= 0;
1377 search_tbl
->antenna_type
= ANT_BOTH
;
1378 ret
= rs_switch_to_mimo(priv
, lq_sta
, conf
, sta
,
1381 lq_sta
->search_better_tbl
= 1;
1382 lq_sta
->action_counter
= 0;
1388 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO
)
1389 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1391 if (tbl
->action
== start_action
)
1399 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO
)
1400 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1406 * Try to switch to new modulation mode from SISO
1408 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1409 struct iwl4965_lq_sta
*lq_sta
,
1410 struct ieee80211_conf
*conf
,
1411 struct sta_info
*sta
,
1415 u8 is_green
= lq_sta
->is_green
;
1416 struct iwl4965_scale_tbl_info
*tbl
=
1417 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1418 struct iwl4965_scale_tbl_info
*search_tbl
=
1419 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1420 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1421 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1422 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1423 u8 start_action
= tbl
->action
;
1426 lq_sta
->action_counter
++;
1427 switch (tbl
->action
) {
1428 case IWL_SISO_SWITCH_ANTENNA
:
1429 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1430 search_tbl
->lq_type
= LQ_NONE
;
1431 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1433 if (!rs_is_other_ant_connected(lq_sta
->antenna
,
1437 memcpy(search_tbl
, tbl
, sz
);
1438 search_tbl
->action
= IWL_SISO_SWITCH_MIMO
;
1439 rs_toggle_antenna(&(search_tbl
->current_rate
),
1441 lq_sta
->search_better_tbl
= 1;
1445 case IWL_SISO_SWITCH_MIMO
:
1446 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1447 memcpy(search_tbl
, tbl
, sz
);
1448 search_tbl
->lq_type
= LQ_MIMO
;
1449 search_tbl
->is_SGI
= 0;
1450 search_tbl
->is_fat
= 0;
1451 search_tbl
->antenna_type
= ANT_BOTH
;
1452 ret
= rs_switch_to_mimo(priv
, lq_sta
, conf
, sta
,
1455 lq_sta
->search_better_tbl
= 1;
1459 case IWL_SISO_SWITCH_GI
:
1460 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1462 memcpy(search_tbl
, tbl
, sz
);
1463 search_tbl
->action
= 0;
1464 if (search_tbl
->is_SGI
)
1465 search_tbl
->is_SGI
= 0;
1467 search_tbl
->is_SGI
= 1;
1470 lq_sta
->search_better_tbl
= 1;
1471 if ((tbl
->lq_type
== LQ_SISO
) &&
1473 s32 tpt
= lq_sta
->last_tpt
/ 100;
1474 if (((!tbl
->is_fat
) &&
1475 (tpt
>= expected_tpt_siso20MHz
[index
])) ||
1477 (tpt
>= expected_tpt_siso40MHz
[index
])))
1478 lq_sta
->search_better_tbl
= 0;
1480 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1481 rs_mcs_from_tbl(&search_tbl
->current_rate
,
1482 search_tbl
, index
, is_green
);
1486 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1487 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1489 if (tbl
->action
== start_action
)
1496 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1497 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1502 * Try to switch to new modulation mode from MIMO
1504 static int rs_move_mimo_to_other(struct iwl_priv
*priv
,
1505 struct iwl4965_lq_sta
*lq_sta
,
1506 struct ieee80211_conf
*conf
,
1507 struct sta_info
*sta
,
1511 s8 is_green
= lq_sta
->is_green
;
1512 struct iwl4965_scale_tbl_info
*tbl
=
1513 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1514 struct iwl4965_scale_tbl_info
*search_tbl
=
1515 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1516 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1517 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1518 u8 start_action
= tbl
->action
;
1521 lq_sta
->action_counter
++;
1522 switch (tbl
->action
) {
1523 case IWL_MIMO_SWITCH_ANTENNA_A
:
1524 case IWL_MIMO_SWITCH_ANTENNA_B
:
1525 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1528 /* Set up new search table for SISO */
1529 memcpy(search_tbl
, tbl
, sz
);
1530 search_tbl
->lq_type
= LQ_SISO
;
1531 search_tbl
->is_SGI
= 0;
1532 search_tbl
->is_fat
= 0;
1533 if (tbl
->action
== IWL_MIMO_SWITCH_ANTENNA_A
)
1534 search_tbl
->antenna_type
= ANT_MAIN
;
1536 search_tbl
->antenna_type
= ANT_AUX
;
1538 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1541 lq_sta
->search_better_tbl
= 1;
1546 case IWL_MIMO_SWITCH_GI
:
1547 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1549 /* Set up new search table for MIMO */
1550 memcpy(search_tbl
, tbl
, sz
);
1551 search_tbl
->lq_type
= LQ_MIMO
;
1552 search_tbl
->antenna_type
= ANT_BOTH
;
1553 search_tbl
->action
= 0;
1554 if (search_tbl
->is_SGI
)
1555 search_tbl
->is_SGI
= 0;
1557 search_tbl
->is_SGI
= 1;
1558 lq_sta
->search_better_tbl
= 1;
1561 * If active table already uses the fastest possible
1562 * modulation (dual stream with short guard interval),
1563 * and it's working well, there's no need to look
1564 * for a better type of modulation!
1566 if ((tbl
->lq_type
== LQ_MIMO
) &&
1568 s32 tpt
= lq_sta
->last_tpt
/ 100;
1569 if (((!tbl
->is_fat
) &&
1570 (tpt
>= expected_tpt_mimo20MHz
[index
])) ||
1572 (tpt
>= expected_tpt_mimo40MHz
[index
])))
1573 lq_sta
->search_better_tbl
= 0;
1575 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1576 rs_mcs_from_tbl(&search_tbl
->current_rate
,
1577 search_tbl
, index
, is_green
);
1582 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1583 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1585 if (tbl
->action
== start_action
)
1592 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1593 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1599 * Check whether we should continue using same modulation mode, or
1600 * begin search for a new mode, based on:
1601 * 1) # tx successes or failures while using this mode
1602 * 2) # times calling this function
1603 * 3) elapsed time in this mode (not used, for now)
1605 static void rs_stay_in_table(struct iwl4965_lq_sta
*lq_sta
)
1607 struct iwl4965_scale_tbl_info
*tbl
;
1610 int flush_interval_passed
= 0;
1612 active_tbl
= lq_sta
->active_tbl
;
1614 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1616 /* If we've been disallowing search, see if we should now allow it */
1617 if (lq_sta
->stay_in_tbl
) {
1619 /* Elapsed time using current modulation mode */
1620 if (lq_sta
->flush_timer
)
1621 flush_interval_passed
=
1623 (unsigned long)(lq_sta
->flush_timer
+
1624 IWL_RATE_SCALE_FLUSH_INTVL
));
1626 /* For now, disable the elapsed time criterion */
1627 flush_interval_passed
= 0;
1630 * Check if we should allow search for new modulation mode.
1631 * If many frames have failed or succeeded, or we've used
1632 * this same modulation for a long time, allow search, and
1633 * reset history stats that keep track of whether we should
1634 * allow a new search. Also (below) reset all bitmaps and
1635 * stats in active history.
1637 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1638 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1639 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1640 && (flush_interval_passed
))) {
1641 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1642 lq_sta
->total_failed
,
1643 lq_sta
->total_success
,
1644 flush_interval_passed
);
1646 /* Allow search for new mode */
1647 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1648 lq_sta
->total_failed
= 0;
1649 lq_sta
->total_success
= 0;
1650 lq_sta
->flush_timer
= 0;
1653 * Else if we've used this modulation mode enough repetitions
1654 * (regardless of elapsed time or success/failure), reset
1655 * history bitmaps and rate-specific stats for all rates in
1659 lq_sta
->table_count
++;
1660 if (lq_sta
->table_count
>=
1661 lq_sta
->table_count_limit
) {
1662 lq_sta
->table_count
= 0;
1664 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1665 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1666 rs_rate_scale_clear_window(
1671 /* If transitioning to allow "search", reset all history
1672 * bitmaps and stats in active table (this will become the new
1673 * "search" table). */
1674 if (!lq_sta
->stay_in_tbl
) {
1675 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1676 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1682 * Do rate scaling and search for new modulation mode.
1684 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
1685 struct net_device
*dev
,
1686 struct ieee80211_hdr
*hdr
,
1687 struct sta_info
*sta
)
1689 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1690 struct ieee80211_hw
*hw
= local_to_hw(local
);
1691 struct ieee80211_conf
*conf
= &hw
->conf
;
1692 int low
= IWL_RATE_INVALID
;
1693 int high
= IWL_RATE_INVALID
;
1696 struct iwl4965_rate_scale_data
*window
= NULL
;
1697 int current_tpt
= IWL_INVALID_VALUE
;
1698 int low_tpt
= IWL_INVALID_VALUE
;
1699 int high_tpt
= IWL_INVALID_VALUE
;
1701 s8 scale_action
= 0;
1704 struct iwl4965_lq_sta
*lq_sta
;
1705 struct iwl4965_scale_tbl_info
*tbl
, *tbl1
;
1706 u16 rate_scale_index_msk
= 0;
1707 struct iwl4965_rate mcs_rate
;
1712 #ifdef CONFIG_IWL4965_HT
1713 u8 tid
= MAX_TID_COUNT
;
1717 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1719 fc
= le16_to_cpu(hdr
->frame_control
);
1720 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
)) {
1721 /* Send management frames and broadcast/multicast data using
1723 /* TODO: this could probably be improved.. */
1727 if (!sta
|| !sta
->rate_ctrl_priv
)
1730 if (!priv
->lq_mngr
.lq_ready
) {
1731 IWL_DEBUG_RATE("still rate scaling not ready\n");
1734 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
1736 #ifdef CONFIG_IWL4965_HT
1737 qc
= ieee80211_get_qos_ctrl(hdr
);
1739 tid
= (u8
)(le16_to_cpu(*qc
) & 0xf);
1740 rs_tl_add_packet(lq_sta
, tid
);
1744 * Select rate-scale / modulation-mode table to work with in
1745 * the rest of this function: "search" if searching for better
1746 * modulation mode, or "active" if doing rate scaling within a mode.
1748 if (!lq_sta
->search_better_tbl
)
1749 active_tbl
= lq_sta
->active_tbl
;
1751 active_tbl
= 1 - lq_sta
->active_tbl
;
1753 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1754 is_green
= lq_sta
->is_green
;
1756 /* current tx rate */
1757 index
= sta
->last_txrate_idx
;
1759 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index
,
1762 /* rates available for this association, and for modulation mode */
1763 rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
,
1766 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask
);
1768 /* mask with station rate restriction */
1769 if (is_legacy(tbl
->lq_type
)) {
1770 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1771 /* supp_rates has no CCK bits in A mode */
1772 rate_scale_index_msk
= (u16
) (rate_mask
&
1773 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
1775 rate_scale_index_msk
= (u16
) (rate_mask
&
1776 lq_sta
->supp_rates
);
1779 rate_scale_index_msk
= rate_mask
;
1781 if (!rate_scale_index_msk
)
1782 rate_scale_index_msk
= rate_mask
;
1784 /* If current rate is no longer supported on current association,
1785 * or user changed preferences for rates, find a new supported rate. */
1786 if (index
< 0 || !((1 << index
) & rate_scale_index_msk
)) {
1787 index
= IWL_INVALID_VALUE
;
1790 /* get the highest available rate */
1791 for (i
= 0; i
<= IWL_RATE_COUNT
; i
++) {
1792 if ((1 << i
) & rate_scale_index_msk
)
1796 if (index
== IWL_INVALID_VALUE
) {
1797 IWL_WARNING("Can not find a suitable rate\n");
1802 /* Get expected throughput table and history window for current rate */
1803 if (!tbl
->expected_tpt
)
1804 rs_get_expected_tpt_table(lq_sta
, tbl
);
1806 window
= &(tbl
->win
[index
]);
1809 * If there is not enough history to calculate actual average
1810 * throughput, keep analyzing results of more tx frames, without
1811 * changing rate or mode (bypass most of the rest of this function).
1812 * Set up new rate table in uCode only if old rate is not supported
1813 * in current association (use new rate found above).
1815 fail_count
= window
->counter
- window
->success_counter
;
1816 if (((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
1817 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
))
1818 || (tbl
->expected_tpt
== NULL
)) {
1819 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1821 window
->success_counter
, window
->counter
, index
);
1823 /* Can't calculate this yet; not enough history */
1824 window
->average_tpt
= IWL_INVALID_VALUE
;
1826 /* Should we stay with this modulation mode,
1827 * or search for a new one? */
1828 rs_stay_in_table(lq_sta
);
1830 /* Set up new rate table in uCode, if needed */
1832 rs_mcs_from_tbl(&mcs_rate
, tbl
, index
, is_green
);
1833 rs_fill_link_cmd(lq_sta
, &mcs_rate
, &lq_sta
->lq
);
1834 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1838 /* Else we have enough samples; calculate estimate of
1839 * actual average throughput */
1841 window
->average_tpt
= ((window
->success_ratio
*
1842 tbl
->expected_tpt
[index
] + 64) / 128);
1844 /* If we are searching for better modulation mode, check success. */
1845 if (lq_sta
->search_better_tbl
) {
1846 int success_limit
= IWL_RATE_SCALE_SWITCH
;
1848 /* If good success, continue using the "search" mode;
1849 * no need to send new link quality command, since we're
1850 * continuing to use the setup that we've been trying. */
1851 if ((window
->success_ratio
> success_limit
) ||
1852 (window
->average_tpt
> lq_sta
->last_tpt
)) {
1853 if (!is_legacy(tbl
->lq_type
)) {
1854 IWL_DEBUG_HT("LQ: we are switching to HT"
1855 " rate suc %d current tpt %d"
1857 window
->success_ratio
,
1858 window
->average_tpt
,
1860 lq_sta
->enable_counter
= 1;
1862 /* Swap tables; "search" becomes "active" */
1863 lq_sta
->active_tbl
= active_tbl
;
1864 current_tpt
= window
->average_tpt
;
1866 /* Else poor success; go back to mode in "active" table */
1868 /* Nullify "search" table */
1869 tbl
->lq_type
= LQ_NONE
;
1871 /* Revert to "active" table */
1872 active_tbl
= lq_sta
->active_tbl
;
1873 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1875 /* Revert to "active" rate and throughput info */
1876 index
= iwl4965_hwrate_to_plcp_idx(
1877 tbl
->current_rate
.rate_n_flags
);
1878 current_tpt
= lq_sta
->last_tpt
;
1880 /* Need to set up a new rate table in uCode */
1882 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1885 /* Either way, we've made a decision; modulation mode
1886 * search is done, allow rate adjustment next time. */
1887 lq_sta
->search_better_tbl
= 0;
1888 done_search
= 1; /* Don't switch modes below! */
1892 /* (Else) not in search of better modulation mode, try for better
1893 * starting rate, while staying in this mode. */
1894 high_low
= rs_get_adjacent_rate(index
, rate_scale_index_msk
,
1896 low
= high_low
& 0xff;
1897 high
= (high_low
>> 8) & 0xff;
1899 /* Collect measured throughputs for current and adjacent rates */
1900 current_tpt
= window
->average_tpt
;
1901 if (low
!= IWL_RATE_INVALID
)
1902 low_tpt
= tbl
->win
[low
].average_tpt
;
1903 if (high
!= IWL_RATE_INVALID
)
1904 high_tpt
= tbl
->win
[high
].average_tpt
;
1906 /* Assume rate increase */
1909 /* Too many failures, decrease rate */
1910 if ((window
->success_ratio
<= IWL_RATE_DECREASE_TH
) ||
1911 (current_tpt
== 0)) {
1912 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1915 /* No throughput measured yet for adjacent rates; try increase. */
1916 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
1917 (high_tpt
== IWL_INVALID_VALUE
))
1920 /* Both adjacent throughputs are measured, but neither one has better
1921 * throughput; we're using the best rate, don't change it! */
1922 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1923 (high_tpt
!= IWL_INVALID_VALUE
) &&
1924 (low_tpt
< current_tpt
) &&
1925 (high_tpt
< current_tpt
))
1928 /* At least one adjacent rate's throughput is measured,
1929 * and may have better performance. */
1931 /* Higher adjacent rate's throughput is measured */
1932 if (high_tpt
!= IWL_INVALID_VALUE
) {
1933 /* Higher rate has better throughput */
1934 if (high_tpt
> current_tpt
)
1938 ("decrease rate because of high tpt\n");
1942 /* Lower adjacent rate's throughput is measured */
1943 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
1944 /* Lower rate has better throughput */
1945 if (low_tpt
> current_tpt
) {
1947 ("decrease rate because of low tpt\n");
1954 /* Sanity check; asked for decrease, but success rate or throughput
1955 * has been good at old rate. Don't change it. */
1956 if (scale_action
== -1) {
1957 if ((low
!= IWL_RATE_INVALID
) &&
1958 ((window
->success_ratio
> IWL_RATE_HIGH_TH
) ||
1959 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
1962 /* Sanity check; asked for increase, but success rate has not been great
1963 * even at old rate, higher rate will be worse. Don't change it. */
1964 } else if ((scale_action
== 1) &&
1965 (window
->success_ratio
< IWL_RATE_INCREASE_TH
))
1968 switch (scale_action
) {
1970 /* Decrease starting rate, update uCode's rate table */
1971 if (low
!= IWL_RATE_INVALID
) {
1977 /* Increase starting rate, update uCode's rate table */
1978 if (high
!= IWL_RATE_INVALID
) {
1990 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1991 "high %d type %d\n",
1992 index
, scale_action
, low
, high
, tbl
->lq_type
);
1995 /* Replace uCode's rate table for the destination station. */
1997 rs_mcs_from_tbl(&mcs_rate
, tbl
, index
, is_green
);
1998 rs_fill_link_cmd(lq_sta
, &mcs_rate
, &lq_sta
->lq
);
1999 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2002 /* Should we stay with this modulation mode, or search for a new one? */
2003 rs_stay_in_table(lq_sta
);
2006 * Search for new modulation mode if we're:
2007 * 1) Not changing rates right now
2008 * 2) Not just finishing up a search
2009 * 3) Allowing a new search
2011 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
&& window
->counter
) {
2012 /* Save current throughput to compare with "search" throughput*/
2013 lq_sta
->last_tpt
= current_tpt
;
2015 /* Select a new "search" modulation mode to try.
2016 * If one is found, set up the new "search" table. */
2017 if (is_legacy(tbl
->lq_type
))
2018 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
2019 else if (is_siso(tbl
->lq_type
))
2020 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
2022 rs_move_mimo_to_other(priv
, lq_sta
, conf
, sta
, index
);
2024 /* If new "search" mode was selected, set up in uCode table */
2025 if (lq_sta
->search_better_tbl
) {
2026 /* Access the "search" table, clear its history. */
2027 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2028 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2029 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2031 /* Use new "search" start rate */
2032 index
= iwl4965_hwrate_to_plcp_idx(
2033 tbl
->current_rate
.rate_n_flags
);
2035 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
2036 tbl
->current_rate
.rate_n_flags
, index
);
2037 rs_fill_link_cmd(lq_sta
, &tbl
->current_rate
,
2039 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2042 /* If the "active" (non-search) mode was legacy,
2043 * and we've tried switching antennas,
2044 * but we haven't been able to try HT modes (not available),
2045 * stay with best antenna legacy modulation for a while
2046 * before next round of mode comparisons. */
2047 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2048 if (is_legacy(tbl1
->lq_type
) &&
2049 #ifdef CONFIG_IWL4965_HT
2050 (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
)) &&
2052 (lq_sta
->action_counter
>= 1)) {
2053 lq_sta
->action_counter
= 0;
2054 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
2055 rs_set_stay_in_table(1, lq_sta
);
2058 /* If we're in an HT mode, and all 3 mode switch actions
2059 * have been tried and compared, stay in this best modulation
2060 * mode for a while before next round of mode comparisons. */
2061 if (lq_sta
->enable_counter
&&
2062 (lq_sta
->action_counter
>= IWL_ACTION_LIMIT
)) {
2063 #ifdef CONFIG_IWL4965_HT
2064 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2065 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2066 (tid
!= MAX_TID_COUNT
)) {
2067 IWL_DEBUG_HT("try to aggregate tid %d\n", tid
);
2068 rs_tl_turn_on_agg(priv
, tid
, lq_sta
, sta
);
2070 #endif /*CONFIG_IWL4965_HT */
2071 lq_sta
->action_counter
= 0;
2072 rs_set_stay_in_table(0, lq_sta
);
2076 * Else, don't search for a new modulation mode.
2077 * Put new timestamp in stay-in-modulation-mode flush timer if:
2078 * 1) Not changing rates right now
2079 * 2) Not just finishing up a search
2080 * 3) flush timer is empty
2083 if ((!update_lq
) && (!done_search
) && (!lq_sta
->flush_timer
))
2084 lq_sta
->flush_timer
= jiffies
;
2088 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, index
, is_green
);
2090 sta
->last_txrate_idx
= i
;
2092 /* sta->txrate_idx is an index to A mode rates which start
2093 * at IWL_FIRST_OFDM_RATE
2095 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2096 sta
->txrate_idx
= i
- IWL_FIRST_OFDM_RATE
;
2098 sta
->txrate_idx
= i
;
2104 static void rs_initialize_lq(struct iwl_priv
*priv
,
2105 struct ieee80211_conf
*conf
,
2106 struct sta_info
*sta
)
2109 struct iwl4965_lq_sta
*lq_sta
;
2110 struct iwl4965_scale_tbl_info
*tbl
;
2113 u8 use_green
= rs_use_green(priv
, conf
);
2114 struct iwl4965_rate mcs_rate
;
2116 if (!sta
|| !sta
->rate_ctrl_priv
)
2119 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2120 i
= sta
->last_txrate_idx
;
2122 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2123 (priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
))
2126 if (!lq_sta
->search_better_tbl
)
2127 active_tbl
= lq_sta
->active_tbl
;
2129 active_tbl
= 1 - lq_sta
->active_tbl
;
2131 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2133 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2136 mcs_rate
.rate_n_flags
= iwl4965_rates
[i
].plcp
;
2137 mcs_rate
.rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
2138 mcs_rate
.rate_n_flags
&= ~RATE_MCS_ANT_A_MSK
;
2140 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2141 mcs_rate
.rate_n_flags
|= RATE_MCS_CCK_MSK
;
2143 tbl
->antenna_type
= ANT_AUX
;
2144 rs_get_tbl_info_from_mcs(&mcs_rate
, priv
->band
, tbl
, &rate_idx
);
2145 if (!rs_is_ant_connected(priv
->valid_antenna
, tbl
->antenna_type
))
2146 rs_toggle_antenna(&mcs_rate
, tbl
);
2148 rs_mcs_from_tbl(&mcs_rate
, tbl
, rate_idx
, use_green
);
2149 tbl
->current_rate
.rate_n_flags
= mcs_rate
.rate_n_flags
;
2150 rs_get_expected_tpt_table(lq_sta
, tbl
);
2151 rs_fill_link_cmd(lq_sta
, &mcs_rate
, &lq_sta
->lq
);
2152 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2157 static void rs_get_rate(void *priv_rate
, struct net_device
*dev
,
2158 struct ieee80211_supported_band
*sband
,
2159 struct sk_buff
*skb
,
2160 struct rate_selection
*sel
)
2164 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
2165 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2166 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2167 struct sta_info
*sta
;
2169 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
2170 struct iwl4965_lq_sta
*lq_sta
;
2172 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2176 sta
= sta_info_get(local
, hdr
->addr1
);
2178 /* Send management frames and broadcast/multicast data using lowest
2180 fc
= le16_to_cpu(hdr
->frame_control
);
2181 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
) ||
2182 !sta
|| !sta
->rate_ctrl_priv
) {
2183 sel
->rate
= rate_lowest(local
, sband
, sta
);
2187 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2188 i
= sta
->last_txrate_idx
;
2190 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
2191 !lq_sta
->ibss_sta_added
) {
2192 u8 sta_id
= iwl4965_hw_find_station(priv
, hdr
->addr1
);
2193 DECLARE_MAC_BUF(mac
);
2195 if (sta_id
== IWL_INVALID_STATION
) {
2196 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2197 print_mac(mac
, hdr
->addr1
));
2198 sta_id
= iwl4965_add_station_flags(priv
, hdr
->addr1
,
2199 0, CMD_ASYNC
, NULL
);
2201 if ((sta_id
!= IWL_INVALID_STATION
)) {
2202 lq_sta
->lq
.sta_id
= sta_id
;
2203 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2204 lq_sta
->ibss_sta_added
= 1;
2205 rs_initialize_lq(priv
, conf
, sta
);
2207 if (!lq_sta
->ibss_sta_added
)
2212 if ((i
< 0) || (i
> IWL_RATE_COUNT
)) {
2213 sel
->rate
= rate_lowest(local
, sband
, sta
);
2217 sel
->rate
= &priv
->ieee_rates
[i
];
2222 static void *rs_alloc_sta(void *priv
, gfp_t gfp
)
2224 struct iwl4965_lq_sta
*lq_sta
;
2227 IWL_DEBUG_RATE("create station rate scale window\n");
2229 lq_sta
= kzalloc(sizeof(struct iwl4965_lq_sta
), gfp
);
2233 lq_sta
->lq
.sta_id
= 0xff;
2236 for (j
= 0; j
< LQ_SIZE
; j
++)
2237 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2238 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2243 static void rs_rate_init(void *priv_rate
, void *priv_sta
,
2244 struct ieee80211_local
*local
,
2245 struct sta_info
*sta
)
2248 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2249 struct ieee80211_supported_band
*sband
;
2250 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
2251 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2253 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
2255 lq_sta
->flush_timer
= 0;
2256 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2257 sta
->txrate_idx
= 3;
2258 for (j
= 0; j
< LQ_SIZE
; j
++)
2259 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2260 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2262 IWL_DEBUG_RATE("rate scale global init\n");
2263 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2264 * the lowest or the highest rate.. Could consider using RSSI from
2265 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2268 lq_sta
->ibss_sta_added
= 0;
2269 if (priv
->iw_mode
== IEEE80211_IF_TYPE_AP
) {
2270 u8 sta_id
= iwl4965_hw_find_station(priv
, sta
->addr
);
2271 DECLARE_MAC_BUF(mac
);
2273 /* for IBSS the call are from tasklet */
2274 IWL_DEBUG_HT("LQ: ADD station %s\n",
2275 print_mac(mac
, sta
->addr
));
2277 if (sta_id
== IWL_INVALID_STATION
) {
2278 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2279 print_mac(mac
, sta
->addr
));
2280 sta_id
= iwl4965_add_station_flags(priv
, sta
->addr
,
2281 0, CMD_ASYNC
, NULL
);
2283 if ((sta_id
!= IWL_INVALID_STATION
)) {
2284 lq_sta
->lq
.sta_id
= sta_id
;
2285 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2287 /* FIXME: this is w/a remove it later */
2288 priv
->assoc_station_added
= 1;
2291 /* Find highest tx rate supported by hardware and destination station */
2292 for (i
= 0; i
< sband
->n_bitrates
; i
++)
2293 if (sta
->supp_rates
[sband
->band
] & BIT(i
))
2294 sta
->txrate_idx
= i
;
2296 sta
->last_txrate_idx
= sta
->txrate_idx
;
2297 /* WTF is with this bogus comment? A doesn't have cck rates */
2298 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2299 if (local
->hw
.conf
.channel
->band
== IEEE80211_BAND_5GHZ
)
2300 sta
->last_txrate_idx
+= IWL_FIRST_OFDM_RATE
;
2303 lq_sta
->valid_antenna
= priv
->valid_antenna
;
2304 lq_sta
->antenna
= priv
->antenna
;
2305 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2306 lq_sta
->active_rate
= priv
->active_rate
;
2307 lq_sta
->active_rate
&= ~(0x1000);
2308 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2309 lq_sta
->band
= priv
->band
;
2310 #ifdef CONFIG_IWL4965_HT
2312 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2313 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2315 lq_sta
->active_siso_rate
= (priv
->current_ht_config
.supp_mcs_set
[0] << 1);
2316 lq_sta
->active_siso_rate
|=
2317 (priv
->current_ht_config
.supp_mcs_set
[0] & 0x1);
2318 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2319 lq_sta
->active_siso_rate
=
2320 lq_sta
->active_siso_rate
<< IWL_FIRST_OFDM_RATE
;
2323 lq_sta
->active_mimo_rate
= (priv
->current_ht_config
.supp_mcs_set
[1] << 1);
2324 lq_sta
->active_mimo_rate
|=
2325 (priv
->current_ht_config
.supp_mcs_set
[1] & 0x1);
2326 lq_sta
->active_mimo_rate
&= ~((u16
)0x2);
2327 lq_sta
->active_mimo_rate
=
2328 lq_sta
->active_mimo_rate
<< IWL_FIRST_OFDM_RATE
;
2329 IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
2330 lq_sta
->active_siso_rate
,
2331 lq_sta
->active_mimo_rate
);
2332 /* as default allow aggregation for all tids */
2333 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2334 #endif /*CONFIG_IWL4965_HT*/
2335 #ifdef CONFIG_MAC80211_DEBUGFS
2339 if (priv
->assoc_station_added
)
2340 priv
->lq_mngr
.lq_ready
= 1;
2342 rs_initialize_lq(priv
, conf
, sta
);
2345 static void rs_fill_link_cmd(struct iwl4965_lq_sta
*lq_sta
,
2346 struct iwl4965_rate
*tx_mcs
,
2347 struct iwl_link_quality_cmd
*lq_cmd
)
2351 int repeat_rate
= 0;
2352 u8 ant_toggle_count
= 0;
2353 u8 use_ht_possible
= 1;
2354 struct iwl4965_rate new_rate
;
2355 struct iwl4965_scale_tbl_info tbl_type
= { 0 };
2357 /* Override starting rate (index 0) if needed for debug purposes */
2358 rs_dbgfs_set_mcs(lq_sta
, tx_mcs
, index
);
2360 /* Interpret rate_n_flags */
2361 rs_get_tbl_info_from_mcs(tx_mcs
, lq_sta
->band
,
2362 &tbl_type
, &rate_idx
);
2364 /* How many times should we repeat the initial rate? */
2365 if (is_legacy(tbl_type
.lq_type
)) {
2366 ant_toggle_count
= 1;
2367 repeat_rate
= IWL_NUMBER_TRY
;
2369 repeat_rate
= IWL_HT_NUMBER_TRY
;
2371 lq_cmd
->general_params
.mimo_delimiter
=
2372 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2374 /* Fill 1st table entry (index 0) */
2375 lq_cmd
->rs_table
[index
].rate_n_flags
=
2376 cpu_to_le32(tx_mcs
->rate_n_flags
);
2377 new_rate
.rate_n_flags
= tx_mcs
->rate_n_flags
;
2379 if (is_mimo(tbl_type
.lq_type
) || (tbl_type
.antenna_type
== ANT_MAIN
))
2380 lq_cmd
->general_params
.single_stream_ant_msk
2381 = LINK_QUAL_ANT_A_MSK
;
2383 lq_cmd
->general_params
.single_stream_ant_msk
2384 = LINK_QUAL_ANT_B_MSK
;
2389 /* Fill rest of rate table */
2390 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2391 /* Repeat initial/next rate.
2392 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2393 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2394 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2395 if (is_legacy(tbl_type
.lq_type
)) {
2396 if (ant_toggle_count
<
2397 NUM_TRY_BEFORE_ANTENNA_TOGGLE
)
2400 rs_toggle_antenna(&new_rate
, &tbl_type
);
2401 ant_toggle_count
= 1;
2405 /* Override next rate if needed for debug purposes */
2406 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2408 /* Fill next table entry */
2409 lq_cmd
->rs_table
[index
].rate_n_flags
=
2410 cpu_to_le32(new_rate
.rate_n_flags
);
2415 rs_get_tbl_info_from_mcs(&new_rate
, lq_sta
->band
, &tbl_type
,
2418 /* Indicate to uCode which entries might be MIMO.
2419 * If initial rate was MIMO, this will finally end up
2420 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2421 if (is_mimo(tbl_type
.lq_type
))
2422 lq_cmd
->general_params
.mimo_delimiter
= index
;
2425 rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2426 use_ht_possible
, &new_rate
);
2428 /* How many times should we repeat the next rate? */
2429 if (is_legacy(tbl_type
.lq_type
)) {
2430 if (ant_toggle_count
< NUM_TRY_BEFORE_ANTENNA_TOGGLE
)
2433 rs_toggle_antenna(&new_rate
, &tbl_type
);
2434 ant_toggle_count
= 1;
2436 repeat_rate
= IWL_NUMBER_TRY
;
2438 repeat_rate
= IWL_HT_NUMBER_TRY
;
2440 /* Don't allow HT rates after next pass.
2441 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2442 use_ht_possible
= 0;
2444 /* Override next rate if needed for debug purposes */
2445 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2447 /* Fill next table entry */
2448 lq_cmd
->rs_table
[index
].rate_n_flags
=
2449 cpu_to_le32(new_rate
.rate_n_flags
);
2455 lq_cmd
->general_params
.dual_stream_ant_msk
= 3;
2456 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2457 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2460 static void *rs_alloc(struct ieee80211_local
*local
)
2462 return local
->hw
.priv
;
2464 /* rate scale requires free function to be implemented */
2465 static void rs_free(void *priv_rate
)
2470 static void rs_clear(void *priv_rate
)
2472 struct iwl_priv
*priv
= (struct iwl_priv
*) priv_rate
;
2474 IWL_DEBUG_RATE("enter\n");
2476 priv
->lq_mngr
.lq_ready
= 0;
2478 IWL_DEBUG_RATE("leave\n");
2481 static void rs_free_sta(void *priv
, void *priv_sta
)
2483 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2485 IWL_DEBUG_RATE("enter\n");
2487 IWL_DEBUG_RATE("leave\n");
2491 #ifdef CONFIG_MAC80211_DEBUGFS
2492 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2494 file
->private_data
= inode
->i_private
;
2497 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
2498 struct iwl4965_rate
*mcs
, int index
)
2502 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2507 if (lq_sta
->dbg_fixed
.rate_n_flags
) {
2509 mcs
->rate_n_flags
= lq_sta
->dbg_fixed
.rate_n_flags
;
2511 mcs
->rate_n_flags
= base_rate
;
2512 IWL_DEBUG_RATE("Fixed rate ON\n");
2516 IWL_DEBUG_RATE("Fixed rate OFF\n");
2519 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2520 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2522 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2527 memset(buf
, 0, sizeof(buf
));
2528 buf_size
= min(count
, sizeof(buf
) - 1);
2529 if (copy_from_user(buf
, user_buf
, buf_size
))
2532 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2533 lq_sta
->dbg_fixed
.rate_n_flags
= parsed_rate
;
2535 lq_sta
->dbg_fixed
.rate_n_flags
= 0;
2537 lq_sta
->active_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2538 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2539 lq_sta
->active_mimo_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2541 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2542 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed
.rate_n_flags
);
2544 if (lq_sta
->dbg_fixed
.rate_n_flags
) {
2545 rs_fill_link_cmd(lq_sta
, &lq_sta
->dbg_fixed
, &lq_sta
->lq
);
2546 iwl_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2552 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2553 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2559 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2561 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2562 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2563 lq_sta
->total_failed
, lq_sta
->total_success
,
2564 lq_sta
->active_rate
);
2565 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2566 lq_sta
->dbg_fixed
.rate_n_flags
);
2567 desc
+= sprintf(buff
+desc
, "general:"
2568 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2569 lq_sta
->lq
.general_params
.flags
,
2570 lq_sta
->lq
.general_params
.mimo_delimiter
,
2571 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2572 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2574 desc
+= sprintf(buff
+desc
, "agg:"
2575 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2576 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2577 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2578 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2580 desc
+= sprintf(buff
+desc
,
2581 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2582 lq_sta
->lq
.general_params
.start_rate_index
[0],
2583 lq_sta
->lq
.general_params
.start_rate_index
[1],
2584 lq_sta
->lq
.general_params
.start_rate_index
[2],
2585 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2588 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
2589 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X\n",
2590 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2592 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2595 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2596 .write
= rs_sta_dbgfs_scale_table_write
,
2597 .read
= rs_sta_dbgfs_scale_table_read
,
2598 .open
= open_file_generic
,
2600 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2601 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2607 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2608 for (i
= 0; i
< LQ_SIZE
; i
++) {
2609 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2611 lq_sta
->active_tbl
== i
?"*":"x",
2612 lq_sta
->lq_info
[i
].lq_type
,
2613 lq_sta
->lq_info
[i
].is_SGI
,
2614 lq_sta
->lq_info
[i
].is_fat
,
2615 lq_sta
->lq_info
[i
].is_dup
,
2616 lq_sta
->lq_info
[i
].current_rate
.rate_n_flags
);
2617 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2618 desc
+= sprintf(buff
+desc
,
2619 "counter=%d success=%d %%=%d\n",
2620 lq_sta
->lq_info
[i
].win
[j
].counter
,
2621 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2622 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2625 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2628 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2629 .read
= rs_sta_dbgfs_stats_table_read
,
2630 .open
= open_file_generic
,
2633 static void rs_add_debugfs(void *priv
, void *priv_sta
,
2636 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2637 lq_sta
->rs_sta_dbgfs_scale_table_file
=
2638 debugfs_create_file("rate_scale_table", 0600, dir
,
2639 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
2640 lq_sta
->rs_sta_dbgfs_stats_table_file
=
2641 debugfs_create_file("rate_stats_table", 0600, dir
,
2642 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
2643 #ifdef CONFIG_IWL4965_HT
2644 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
2645 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
2646 &lq_sta
->tx_agg_tid_en
);
2651 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
2653 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2654 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
2655 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
2656 #ifdef CONFIG_IWL4965_HT
2657 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
2662 static struct rate_control_ops rs_ops
= {
2665 .tx_status
= rs_tx_status
,
2666 .get_rate
= rs_get_rate
,
2667 .rate_init
= rs_rate_init
,
2671 .alloc_sta
= rs_alloc_sta
,
2672 .free_sta
= rs_free_sta
,
2673 #ifdef CONFIG_MAC80211_DEBUGFS
2674 .add_sta_debugfs
= rs_add_debugfs
,
2675 .remove_sta_debugfs
= rs_remove_debugfs
,
2679 int iwl4965_fill_rs_info(struct ieee80211_hw
*hw
, char *buf
, u8 sta_id
)
2681 struct ieee80211_local
*local
= hw_to_local(hw
);
2682 struct iwl_priv
*priv
= hw
->priv
;
2683 struct iwl4965_lq_sta
*lq_sta
;
2684 struct sta_info
*sta
;
2686 u32 samples
= 0, success
= 0, good
= 0;
2687 unsigned long now
= jiffies
;
2689 u8 lq_type
, antenna
;
2693 sta
= sta_info_get(local
, priv
->stations
[sta_id
].sta
.sta
.addr
);
2694 if (!sta
|| !sta
->rate_ctrl_priv
) {
2696 IWL_DEBUG_RATE("leave - no private rate data!\n");
2698 IWL_DEBUG_RATE("leave - no station!\n");
2700 return sprintf(buf
, "station %d not found\n", sta_id
);
2703 lq_sta
= (void *)sta
->rate_ctrl_priv
;
2705 lq_type
= lq_sta
->lq_info
[lq_sta
->active_tbl
].lq_type
;
2706 antenna
= lq_sta
->lq_info
[lq_sta
->active_tbl
].antenna_type
;
2708 if (is_legacy(lq_type
))
2709 i
= IWL_RATE_54M_INDEX
;
2711 i
= IWL_RATE_60M_INDEX
;
2715 int active
= lq_sta
->active_tbl
;
2718 sprintf(&buf
[cnt
], " %2dMbs: ", iwl4965_rates
[i
].ieee
/ 2);
2720 mask
= (1ULL << (IWL_RATE_MAX_WINDOW
- 1));
2721 for (j
= 0; j
< IWL_RATE_MAX_WINDOW
; j
++, mask
>>= 1)
2723 (lq_sta
->lq_info
[active
].win
[i
].data
& mask
)
2726 samples
+= lq_sta
->lq_info
[active
].win
[i
].counter
;
2727 good
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
;
2728 success
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
*
2729 iwl4965_rates
[i
].ieee
;
2731 if (lq_sta
->lq_info
[active
].win
[i
].stamp
) {
2733 jiffies_to_msecs(now
-
2734 lq_sta
->lq_info
[active
].win
[i
].stamp
);
2736 if (delta
> max_time
)
2739 cnt
+= sprintf(&buf
[cnt
], "%5dms\n", delta
);
2743 j
= iwl4965_get_prev_ieee_rate(i
);
2749 /* Display the average rate of all samples taken.
2751 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2752 * added from iwl4965_rates is actually 2X the rate */
2754 cnt
+= sprintf(&buf
[cnt
],
2755 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2756 "%3d%% success (%d good packets over %d tries)\n",
2757 success
/ (2 * samples
), (success
* 5 / samples
) % 10,
2758 max_time
, good
* 100 / samples
, good
, samples
);
2760 cnt
+= sprintf(&buf
[cnt
], "\nAverage rate: 0Mbs\n");
2762 cnt
+= sprintf(&buf
[cnt
], "\nrate scale type %d antenna %d "
2763 "active_search %d rate index %d\n", lq_type
, antenna
,
2764 lq_sta
->search_better_tbl
, sta
->last_txrate_idx
);
2770 void iwl4965_rate_scale_init(struct ieee80211_hw
*hw
, s32 sta_id
)
2772 struct iwl_priv
*priv
= hw
->priv
;
2774 priv
->lq_mngr
.lq_ready
= 1;
2777 int iwl4965_rate_control_register(void)
2779 return ieee80211_rate_control_register(&rs_ops
);
2782 void iwl4965_rate_control_unregister(void)
2784 ieee80211_rate_control_unregister(&rs_ops
);