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/ieee80211_rate.h"
42 #include "iwl-helpers.h"
44 #define RS_NAME "iwl-4965-rs"
46 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
57 static u8 rs_ht_to_legacy
[] = {
58 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
59 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
61 IWL_RATE_6M_INDEX
, IWL_RATE_9M_INDEX
,
62 IWL_RATE_12M_INDEX
, IWL_RATE_18M_INDEX
,
63 IWL_RATE_24M_INDEX
, IWL_RATE_36M_INDEX
,
64 IWL_RATE_48M_INDEX
, IWL_RATE_54M_INDEX
69 } __attribute__ ((packed
));
72 * struct iwl4965_rate_scale_data -- tx success history for one rate
74 struct iwl4965_rate_scale_data
{
75 u64 data
; /* bitmap of successful frames */
76 s32 success_counter
; /* number of frames successful */
77 s32 success_ratio
; /* per-cent * 128 */
78 s32 counter
; /* number of frames attempted */
79 s32 average_tpt
; /* success ratio * expected throughput */
84 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
86 * There are two of these in struct iwl4965_lq_sta,
87 * one for "active", and one for "search".
89 struct iwl4965_scale_tbl_info
{
90 enum iwl4965_table_type lq_type
;
91 enum iwl4965_antenna_type antenna_type
;
92 u8 is_SGI
; /* 1 = short guard interval */
93 u8 is_fat
; /* 1 = 40 MHz channel width */
94 u8 is_dup
; /* 1 = duplicated data streams */
95 u8 action
; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
96 s32
*expected_tpt
; /* throughput metrics; expected_tpt_G, etc. */
97 struct iwl4965_rate current_rate
; /* rate_n_flags, uCode API format */
98 struct iwl4965_rate_scale_data win
[IWL_RATE_COUNT
]; /* rate histories */
101 #ifdef CONFIG_IWL4965_HT
103 struct iwl4965_traffic_load
{
104 unsigned long time_stamp
; /* age of the oldest statistics */
105 u32 packet_count
[TID_QUEUE_MAX_SIZE
]; /* packet count in this time
107 u32 total
; /* total num of packets during the
108 * last TID_MAX_TIME_DIFF */
109 u8 queue_count
; /* number of queues that has
110 * been used since the last cleanup */
111 u8 head
; /* start of the circular buffer */
114 #endif /* CONFIG_IWL4965_HT */
117 * struct iwl4965_lq_sta -- driver's rate scaling private structure
119 * Pointer to this gets passed back and forth between driver and mac80211.
121 struct iwl4965_lq_sta
{
122 u8 active_tbl
; /* index of active table, range 0-1 */
123 u8 enable_counter
; /* indicates HT mode */
124 u8 stay_in_tbl
; /* 1: disallow, 0: allow search for new mode */
125 u8 search_better_tbl
; /* 1: currently trying alternate mode */
128 /* The following determine when to search for a new mode */
129 u32 table_count_limit
;
130 u32 max_failure_limit
; /* # failed frames before new search */
131 u32 max_success_limit
; /* # successful frames before new search */
133 u32 total_failed
; /* total failed frames, any/all rates */
134 u32 total_success
; /* total successful frames, any/all rates */
135 u32 flush_timer
; /* time staying in mode before new search */
137 u8 action_counter
; /* # mode-switch actions tried */
142 enum ieee80211_band band
;
145 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
148 u16 active_siso_rate
;
149 u16 active_mimo_rate
;
150 u16 active_rate_basic
;
152 struct iwl4965_link_quality_cmd lq
;
153 struct iwl4965_scale_tbl_info lq_info
[LQ_SIZE
]; /* "active", "search" */
154 #ifdef CONFIG_IWL4965_HT
155 struct iwl4965_traffic_load load
[TID_MAX_LOAD_COUNT
];
158 #ifdef CONFIG_MAC80211_DEBUGFS
159 struct dentry
*rs_sta_dbgfs_scale_table_file
;
160 struct dentry
*rs_sta_dbgfs_stats_table_file
;
161 #ifdef CONFIG_IWL4965_HT
162 struct dentry
*rs_sta_dbgfs_tx_agg_tid_en_file
;
164 struct iwl4965_rate dbg_fixed
;
165 struct iwl4965_priv
*drv
;
169 static void rs_rate_scale_perform(struct iwl4965_priv
*priv
,
170 struct net_device
*dev
,
171 struct ieee80211_hdr
*hdr
,
172 struct sta_info
*sta
);
173 static void rs_fill_link_cmd(struct iwl4965_lq_sta
*lq_sta
,
174 struct iwl4965_rate
*tx_mcs
,
175 struct iwl4965_link_quality_cmd
*tbl
);
178 #ifdef CONFIG_MAC80211_DEBUGFS
179 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
180 struct iwl4965_rate
*mcs
, int index
);
182 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
183 struct iwl4965_rate
*mcs
, int index
)
188 * Expected throughput metrics for following rates:
189 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
190 * "G" is the only table that supports CCK (the first 4 rates).
192 static s32 expected_tpt_A
[IWL_RATE_COUNT
] = {
193 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
196 static s32 expected_tpt_G
[IWL_RATE_COUNT
] = {
197 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
200 static s32 expected_tpt_siso20MHz
[IWL_RATE_COUNT
] = {
201 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
204 static s32 expected_tpt_siso20MHzSGI
[IWL_RATE_COUNT
] = {
205 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
208 static s32 expected_tpt_mimo20MHz
[IWL_RATE_COUNT
] = {
209 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
212 static s32 expected_tpt_mimo20MHzSGI
[IWL_RATE_COUNT
] = {
213 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
216 static s32 expected_tpt_siso40MHz
[IWL_RATE_COUNT
] = {
217 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
220 static s32 expected_tpt_siso40MHzSGI
[IWL_RATE_COUNT
] = {
221 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
224 static s32 expected_tpt_mimo40MHz
[IWL_RATE_COUNT
] = {
225 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
228 static s32 expected_tpt_mimo40MHzSGI
[IWL_RATE_COUNT
] = {
229 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
232 static int iwl4965_lq_sync_callback(struct iwl4965_priv
*priv
,
233 struct iwl4965_cmd
*cmd
, struct sk_buff
*skb
)
235 /*We didn't cache the SKB; let the caller free it */
239 static inline u8
iwl4965_rate_get_rate(u32 rate_n_flags
)
241 return (u8
)(rate_n_flags
& 0xFF);
244 static int rs_send_lq_cmd(struct iwl4965_priv
*priv
,
245 struct iwl4965_link_quality_cmd
*lq
, u8 flags
)
247 #ifdef CONFIG_IWL4965_DEBUG
250 struct iwl4965_host_cmd cmd
= {
251 .id
= REPLY_TX_LINK_QUALITY_CMD
,
252 .len
= sizeof(struct iwl4965_link_quality_cmd
),
257 if ((lq
->sta_id
== 0xFF) &&
258 (priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
))
261 if (lq
->sta_id
== 0xFF)
262 lq
->sta_id
= IWL_AP_ID
;
264 IWL_DEBUG_RATE("lq station id 0x%x\n", lq
->sta_id
);
265 IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
266 lq
->general_params
.single_stream_ant_msk
,
267 lq
->general_params
.dual_stream_ant_msk
);
268 #ifdef CONFIG_IWL4965_DEBUG
269 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
270 IWL_DEBUG_RATE("lq index %d 0x%X\n",
271 i
, lq
->rs_table
[i
].rate_n_flags
);
274 if (flags
& CMD_ASYNC
)
275 cmd
.meta
.u
.callback
= iwl4965_lq_sync_callback
;
277 if (iwl4965_is_associated(priv
) && priv
->assoc_station_added
&&
278 priv
->lq_mngr
.lq_ready
)
279 return iwl4965_send_cmd(priv
, &cmd
);
284 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data
*window
)
287 window
->success_counter
= 0;
288 window
->success_ratio
= IWL_INVALID_VALUE
;
290 window
->average_tpt
= IWL_INVALID_VALUE
;
294 #ifdef CONFIG_IWL4965_HT
296 * removes the old data from the statistics. All data that is older than
297 * TID_MAX_TIME_DIFF, will be deleted.
299 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load
*tl
, u32 curr_time
)
301 /* The oldest age we want to keep */
302 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
304 while (tl
->queue_count
&&
305 (tl
->time_stamp
< oldest_time
)) {
306 tl
->total
-= tl
->packet_count
[tl
->head
];
307 tl
->packet_count
[tl
->head
] = 0;
308 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
311 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
317 * increment traffic load value for tid and also remove
318 * any old values if passed the certain time period
320 static void rs_tl_add_packet(struct iwl4965_lq_sta
*lq_data
, u8 tid
)
322 u32 curr_time
= jiffies_to_msecs(jiffies
);
325 struct iwl4965_traffic_load
*tl
= NULL
;
327 if (tid
>= TID_MAX_LOAD_COUNT
)
330 tl
= &lq_data
->load
[tid
];
332 curr_time
-= curr_time
% TID_ROUND_VALUE
;
334 /* Happens only for the first packet. Initialize the data */
335 if (!(tl
->queue_count
)) {
337 tl
->time_stamp
= curr_time
;
340 tl
->packet_count
[0] = 1;
344 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
345 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
347 /* The history is too long: remove data that is older than */
348 /* TID_MAX_TIME_DIFF */
349 if (index
>= TID_QUEUE_MAX_SIZE
)
350 rs_tl_rm_old_stats(tl
, curr_time
);
352 index
= (tl
->head
+ index
) % TID_QUEUE_MAX_SIZE
;
353 tl
->packet_count
[index
] = tl
->packet_count
[index
] + 1;
354 tl
->total
= tl
->total
+ 1;
356 if ((index
+ 1) > tl
->queue_count
)
357 tl
->queue_count
= index
+ 1;
361 get the traffic load value for tid
363 static u32
rs_tl_get_load(struct iwl4965_lq_sta
*lq_data
, u8 tid
)
365 u32 curr_time
= jiffies_to_msecs(jiffies
);
368 struct iwl4965_traffic_load
*tl
= NULL
;
370 if (tid
>= TID_MAX_LOAD_COUNT
)
373 tl
= &(lq_data
->load
[tid
]);
375 curr_time
-= curr_time
% TID_ROUND_VALUE
;
377 if (!(tl
->queue_count
))
380 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
381 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
383 /* The history is too long: remove data that is older than */
384 /* TID_MAX_TIME_DIFF */
385 if (index
>= TID_QUEUE_MAX_SIZE
)
386 rs_tl_rm_old_stats(tl
, curr_time
);
391 static void rs_tl_turn_on_agg_for_tid(struct iwl4965_priv
*priv
,
392 struct iwl4965_lq_sta
*lq_data
, u8 tid
,
393 struct sta_info
*sta
)
396 DECLARE_MAC_BUF(mac
);
398 spin_lock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
399 state
= sta
->ampdu_mlme
.tid_tx
[tid
].state
;
400 spin_unlock_bh(&sta
->ampdu_mlme
.ampdu_tx
);
402 if (state
== HT_AGG_STATE_IDLE
&&
403 rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
404 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
405 print_mac(mac
, sta
->addr
), tid
);
406 ieee80211_start_tx_ba_session(priv
->hw
, sta
->addr
, tid
);
410 static void rs_tl_turn_on_agg(struct iwl4965_priv
*priv
, u8 tid
,
411 struct iwl4965_lq_sta
*lq_data
,
412 struct sta_info
*sta
)
414 if ((tid
< TID_MAX_LOAD_COUNT
))
415 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
416 else if (tid
== IWL_AGG_ALL_TID
)
417 for (tid
= 0; tid
< TID_MAX_LOAD_COUNT
; tid
++)
418 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
421 #endif /* CONFIG_IWLWIFI_HT */
424 * rs_collect_tx_data - Update the success/failure sliding window
426 * We keep a sliding window of the last 62 packets transmitted
427 * at this rate. window->data contains the bitmask of successful
430 static int rs_collect_tx_data(struct iwl4965_rate_scale_data
*windows
,
431 int scale_index
, s32 tpt
, int retries
,
434 struct iwl4965_rate_scale_data
*window
= NULL
;
436 u8 win_size
= IWL_RATE_MAX_WINDOW
;
439 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
442 /* Select data for current tx bit rate */
443 window
= &(windows
[scale_index
]);
446 * Keep track of only the latest 62 tx frame attempts in this rate's
447 * history window; anything older isn't really relevant any more.
448 * If we have filled up the sliding window, drop the oldest attempt;
449 * if the oldest attempt (highest bit in bitmap) shows "success",
450 * subtract "1" from the success counter (this is the main reason
451 * we keep these bitmaps!).
453 while (retries
> 0) {
454 if (window
->counter
>= win_size
) {
455 window
->counter
= win_size
- 1;
457 mask
= (mask
<< (win_size
- 1));
458 if (window
->data
& mask
) {
459 window
->data
&= ~mask
;
460 window
->success_counter
=
461 window
->success_counter
- 1;
465 /* Increment frames-attempted counter */
468 /* Shift bitmap by one frame (throw away oldest history),
469 * OR in "1", and increment "success" if this
470 * frame was successful. */
472 window
->data
= (mask
<< 1);
474 window
->success_counter
= window
->success_counter
+ 1;
482 /* Calculate current success ratio, avoid divide-by-0! */
483 if (window
->counter
> 0)
484 window
->success_ratio
= 128 * (100 * window
->success_counter
)
487 window
->success_ratio
= IWL_INVALID_VALUE
;
489 fail_count
= window
->counter
- window
->success_counter
;
491 /* Calculate average throughput, if we have enough history. */
492 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
493 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
494 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
496 window
->average_tpt
= IWL_INVALID_VALUE
;
498 /* Tag this window as having been updated */
499 window
->stamp
= jiffies
;
505 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
507 static void rs_mcs_from_tbl(struct iwl4965_rate
*mcs_rate
,
508 struct iwl4965_scale_tbl_info
*tbl
,
509 int index
, u8 use_green
)
511 if (is_legacy(tbl
->lq_type
)) {
512 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp
;
513 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
514 mcs_rate
->rate_n_flags
|= RATE_MCS_CCK_MSK
;
516 } else if (is_siso(tbl
->lq_type
)) {
517 if (index
> IWL_LAST_OFDM_RATE
)
518 index
= IWL_LAST_OFDM_RATE
;
519 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp_siso
|
522 if (index
> IWL_LAST_OFDM_RATE
)
523 index
= IWL_LAST_OFDM_RATE
;
524 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp_mimo
|
528 switch (tbl
->antenna_type
) {
530 mcs_rate
->rate_n_flags
|= RATE_MCS_ANT_AB_MSK
;
533 mcs_rate
->rate_n_flags
|= RATE_MCS_ANT_A_MSK
;
536 mcs_rate
->rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
542 if (is_legacy(tbl
->lq_type
))
547 mcs_rate
->rate_n_flags
|= RATE_MCS_DUP_MSK
;
549 mcs_rate
->rate_n_flags
|= RATE_MCS_FAT_MSK
;
552 mcs_rate
->rate_n_flags
|= RATE_MCS_SGI_MSK
;
555 mcs_rate
->rate_n_flags
|= RATE_MCS_GF_MSK
;
556 if (is_siso(tbl
->lq_type
))
557 mcs_rate
->rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
562 * Interpret uCode API's rate_n_flags format,
563 * fill "search" or "active" tx mode table.
565 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate
*mcs_rate
,
566 enum ieee80211_band band
,
567 struct iwl4965_scale_tbl_info
*tbl
,
573 index
= iwl4965_hwrate_to_plcp_idx(mcs_rate
->rate_n_flags
);
575 if (index
== IWL_RATE_INVALID
) {
579 tbl
->is_SGI
= 0; /* default legacy setup */
582 tbl
->antenna_type
= ANT_BOTH
; /* default MIMO setup */
584 /* legacy rate format */
585 if (!(mcs_rate
->rate_n_flags
& RATE_MCS_HT_MSK
)) {
586 ant_msk
= (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_AB_MSK
);
588 if (ant_msk
== RATE_MCS_ANT_AB_MSK
)
589 tbl
->lq_type
= LQ_NONE
;
592 if (band
== IEEE80211_BAND_5GHZ
)
597 if (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_A_MSK
)
598 tbl
->antenna_type
= ANT_MAIN
;
600 tbl
->antenna_type
= ANT_AUX
;
604 /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
605 } else if (iwl4965_rate_get_rate(mcs_rate
->rate_n_flags
)
606 <= IWL_RATE_SISO_60M_PLCP
) {
607 tbl
->lq_type
= LQ_SISO
;
609 ant_msk
= (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_AB_MSK
);
610 if (ant_msk
== RATE_MCS_ANT_AB_MSK
)
611 tbl
->lq_type
= LQ_NONE
;
613 if (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_A_MSK
)
614 tbl
->antenna_type
= ANT_MAIN
;
616 tbl
->antenna_type
= ANT_AUX
;
618 if (mcs_rate
->rate_n_flags
& RATE_MCS_SGI_MSK
)
621 if ((mcs_rate
->rate_n_flags
& RATE_MCS_FAT_MSK
) ||
622 (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
))
625 if (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
)
630 /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
632 tbl
->lq_type
= LQ_MIMO
;
633 if (mcs_rate
->rate_n_flags
& RATE_MCS_SGI_MSK
)
636 if ((mcs_rate
->rate_n_flags
& RATE_MCS_FAT_MSK
) ||
637 (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
))
640 if (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
)
647 static inline void rs_toggle_antenna(struct iwl4965_rate
*new_rate
,
648 struct iwl4965_scale_tbl_info
*tbl
)
650 if (tbl
->antenna_type
== ANT_AUX
) {
651 tbl
->antenna_type
= ANT_MAIN
;
652 new_rate
->rate_n_flags
&= ~RATE_MCS_ANT_B_MSK
;
653 new_rate
->rate_n_flags
|= RATE_MCS_ANT_A_MSK
;
655 tbl
->antenna_type
= ANT_AUX
;
656 new_rate
->rate_n_flags
&= ~RATE_MCS_ANT_A_MSK
;
657 new_rate
->rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
661 static inline u8
rs_use_green(struct iwl4965_priv
*priv
,
662 struct ieee80211_conf
*conf
)
664 #ifdef CONFIG_IWL4965_HT
665 return ((conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) &&
666 priv
->current_ht_config
.is_green_field
&&
667 !priv
->current_ht_config
.non_GF_STA_present
);
668 #endif /* CONFIG_IWL4965_HT */
673 * rs_get_supported_rates - get the available rates
675 * if management frame or broadcast frame only return
676 * basic available rates.
679 static void rs_get_supported_rates(struct iwl4965_lq_sta
*lq_sta
,
680 struct ieee80211_hdr
*hdr
,
681 enum iwl4965_table_type rate_type
,
684 if (is_legacy(rate_type
))
685 *data_rate
= lq_sta
->active_rate
;
687 if (is_siso(rate_type
))
688 *data_rate
= lq_sta
->active_siso_rate
;
690 *data_rate
= lq_sta
->active_mimo_rate
;
693 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
694 lq_sta
->active_rate_basic
) {
695 *data_rate
= lq_sta
->active_rate_basic
;
699 static u16
rs_get_adjacent_rate(u8 index
, u16 rate_mask
, int rate_type
)
701 u8 high
= IWL_RATE_INVALID
;
702 u8 low
= IWL_RATE_INVALID
;
704 /* 802.11A or ht walks to the next literal adjacent rate in
706 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
710 /* Find the previous rate that is in the rate mask */
712 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
713 if (rate_mask
& mask
) {
719 /* Find the next rate that is in the rate mask */
721 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
722 if (rate_mask
& mask
) {
728 return (high
<< 8) | low
;
732 while (low
!= IWL_RATE_INVALID
) {
733 low
= iwl4965_rates
[low
].prev_rs
;
734 if (low
== IWL_RATE_INVALID
)
736 if (rate_mask
& (1 << low
))
738 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low
);
742 while (high
!= IWL_RATE_INVALID
) {
743 high
= iwl4965_rates
[high
].next_rs
;
744 if (high
== IWL_RATE_INVALID
)
746 if (rate_mask
& (1 << high
))
748 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high
);
751 return (high
<< 8) | low
;
754 static void rs_get_lower_rate(struct iwl4965_lq_sta
*lq_sta
,
755 struct iwl4965_scale_tbl_info
*tbl
, u8 scale_index
,
756 u8 ht_possible
, struct iwl4965_rate
*mcs_rate
)
761 u8 switch_to_legacy
= 0;
762 u8 is_green
= lq_sta
->is_green
;
764 /* check if we need to switch from HT to legacy rates.
765 * assumption is that mandatory rates (1Mbps or 6Mbps)
766 * are always supported (spec demand) */
767 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
768 switch_to_legacy
= 1;
769 scale_index
= rs_ht_to_legacy
[scale_index
];
770 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
775 if ((tbl
->antenna_type
== ANT_BOTH
) ||
776 (tbl
->antenna_type
== ANT_NONE
))
777 tbl
->antenna_type
= ANT_MAIN
;
783 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
, &rate_mask
);
785 /* Mask with station rate restriction */
786 if (is_legacy(tbl
->lq_type
)) {
787 /* supp_rates has no CCK bits in A mode */
788 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
789 rate_mask
= (u16
)(rate_mask
&
790 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
792 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
795 /* If we switched from HT to legacy, check current rate */
796 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
797 rs_mcs_from_tbl(mcs_rate
, tbl
, scale_index
, is_green
);
801 high_low
= rs_get_adjacent_rate(scale_index
, rate_mask
, tbl
->lq_type
);
802 low
= high_low
& 0xff;
804 if (low
!= IWL_RATE_INVALID
)
805 rs_mcs_from_tbl(mcs_rate
, tbl
, low
, is_green
);
807 rs_mcs_from_tbl(mcs_rate
, tbl
, scale_index
, is_green
);
811 * mac80211 sends us Tx status
813 static void rs_tx_status(void *priv_rate
, struct net_device
*dev
,
815 struct ieee80211_tx_status
*tx_resp
)
819 int rs_index
, index
= 0;
820 struct iwl4965_lq_sta
*lq_sta
;
821 struct iwl4965_link_quality_cmd
*table
;
822 struct sta_info
*sta
;
823 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
824 struct iwl4965_priv
*priv
= (struct iwl4965_priv
*)priv_rate
;
825 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
826 struct ieee80211_hw
*hw
= local_to_hw(local
);
827 struct iwl4965_rate_scale_data
*window
= NULL
;
828 struct iwl4965_rate_scale_data
*search_win
= NULL
;
829 struct iwl4965_rate tx_mcs
;
830 struct iwl4965_scale_tbl_info tbl_type
;
831 struct iwl4965_scale_tbl_info
*curr_tbl
, *search_tbl
;
833 u16 fc
= le16_to_cpu(hdr
->frame_control
);
836 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
838 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
))
841 /* This packet was aggregated but doesn't carry rate scale info */
842 if ((tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
) &&
843 !(tx_resp
->flags
& IEEE80211_TX_STATUS_AMPDU
))
846 retries
= tx_resp
->retry_count
;
853 sta
= sta_info_get(local
, hdr
->addr1
);
855 if (!sta
|| !sta
->rate_ctrl_priv
)
859 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
861 if (!priv
->lq_mngr
.lq_ready
)
864 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
865 !lq_sta
->ibss_sta_added
)
869 active_index
= lq_sta
->active_tbl
;
871 /* Get mac80211 antenna info */
873 (lq_sta
->valid_antenna
& local
->hw
.conf
.antenna_sel_tx
);
874 if (!lq_sta
->antenna
)
875 lq_sta
->antenna
= lq_sta
->valid_antenna
;
877 /* Ignore mac80211 antenna info for now */
878 lq_sta
->antenna
= lq_sta
->valid_antenna
;
880 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
881 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
882 window
= (struct iwl4965_rate_scale_data
*)
884 search_win
= (struct iwl4965_rate_scale_data
*)
885 &(search_tbl
->win
[0]);
888 * Ignore this Tx frame response if its initial rate doesn't match
889 * that of latest Link Quality command. There may be stragglers
890 * from a previous Link Quality command, but we're no longer interested
891 * in those; they're either from the "active" mode while we're trying
892 * to check "search" mode, or a prior "search" mode after we've moved
893 * to a new "search" mode (which might become the new "active" mode).
895 tx_mcs
.rate_n_flags
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
896 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->band
, &tbl_type
, &rs_index
);
897 if (priv
->band
== IEEE80211_BAND_5GHZ
)
898 rs_index
-= IWL_FIRST_OFDM_RATE
;
900 if ((tx_resp
->control
.tx_rate
== NULL
) ||
902 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_SHORT_GI
)) ||
904 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_40_MHZ_WIDTH
)) ||
906 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_DUP_DATA
)) ||
907 (tbl_type
.antenna_type
^
908 tx_resp
->control
.antenna_sel_tx
) ||
909 (!!(tx_mcs
.rate_n_flags
& RATE_MCS_HT_MSK
) ^
910 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_OFDM_HT
)) ||
911 (!!(tx_mcs
.rate_n_flags
& RATE_MCS_GF_MSK
) ^
912 !!(tx_resp
->control
.flags
& IEEE80211_TXCTL_GREEN_FIELD
)) ||
913 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
914 tx_resp
->control
.tx_rate
->bitrate
)) {
915 IWL_DEBUG_RATE("initial rate does not match 0x%x\n",
916 tx_mcs
.rate_n_flags
);
920 /* Update frame history window with "failure" for each Tx retry. */
922 /* Look up the rate and other info used for each tx attempt.
923 * Each tx attempt steps one entry deeper in the rate table. */
924 tx_mcs
.rate_n_flags
=
925 le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
926 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->band
,
927 &tbl_type
, &rs_index
);
929 /* If type matches "search" table,
930 * add failure 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 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
940 /* Else if type matches "current/active" table,
941 * add failure to "current/active" history */
942 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
943 (tbl_type
.antenna_type
== curr_tbl
->antenna_type
) &&
944 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
945 if (curr_tbl
->expected_tpt
)
946 tpt
= curr_tbl
->expected_tpt
[rs_index
];
949 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
952 /* If not searching for a new mode, increment failed counter
953 * ... this helps determine when to start searching again */
954 if (lq_sta
->stay_in_tbl
)
955 lq_sta
->total_failed
++;
962 * Find (by rate) the history window to update with final Tx attempt;
963 * if Tx was successful first try, use original rate,
964 * else look up the rate that was, finally, successful.
966 tx_mcs
.rate_n_flags
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
967 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->band
, &tbl_type
, &rs_index
);
969 /* Update frame history window with "success" if Tx got ACKed ... */
970 if (tx_resp
->flags
& IEEE80211_TX_STATUS_ACK
)
975 /* If type matches "search" table,
976 * add final tx status to "search" history */
977 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
978 (tbl_type
.antenna_type
== search_tbl
->antenna_type
) &&
979 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
980 if (search_tbl
->expected_tpt
)
981 tpt
= search_tbl
->expected_tpt
[rs_index
];
984 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
)
985 rs_collect_tx_data(search_win
, rs_index
, tpt
,
986 tx_resp
->ampdu_ack_len
,
987 tx_resp
->ampdu_ack_map
);
989 rs_collect_tx_data(search_win
, rs_index
, tpt
,
991 /* Else if type matches "current/active" table,
992 * add final tx status to "current/active" history */
993 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
994 (tbl_type
.antenna_type
== curr_tbl
->antenna_type
) &&
995 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
996 if (curr_tbl
->expected_tpt
)
997 tpt
= curr_tbl
->expected_tpt
[rs_index
];
1000 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
)
1001 rs_collect_tx_data(window
, rs_index
, tpt
,
1002 tx_resp
->ampdu_ack_len
,
1003 tx_resp
->ampdu_ack_map
);
1005 rs_collect_tx_data(window
, rs_index
, tpt
,
1009 /* If not searching for new mode, increment success/failed counter
1010 * ... these help determine when to start searching again */
1011 if (lq_sta
->stay_in_tbl
) {
1012 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
) {
1013 lq_sta
->total_success
+= tx_resp
->ampdu_ack_map
;
1014 lq_sta
->total_failed
+=
1015 (tx_resp
->ampdu_ack_len
- tx_resp
->ampdu_ack_map
);
1018 lq_sta
->total_success
++;
1020 lq_sta
->total_failed
++;
1024 /* See if there's a better rate or modulation mode to try. */
1025 rs_rate_scale_perform(priv
, dev
, hdr
, sta
);
1031 static u8
rs_is_ant_connected(u8 valid_antenna
,
1032 enum iwl4965_antenna_type antenna_type
)
1034 if (antenna_type
== ANT_AUX
)
1035 return ((valid_antenna
& 0x2) ? 1:0);
1036 else if (antenna_type
== ANT_MAIN
)
1037 return ((valid_antenna
& 0x1) ? 1:0);
1038 else if (antenna_type
== ANT_BOTH
)
1039 return ((valid_antenna
& 0x3) == 0x3);
1044 static u8
rs_is_other_ant_connected(u8 valid_antenna
,
1045 enum iwl4965_antenna_type antenna_type
)
1047 if (antenna_type
== ANT_AUX
)
1048 return rs_is_ant_connected(valid_antenna
, ANT_MAIN
);
1050 return rs_is_ant_connected(valid_antenna
, ANT_AUX
);
1056 * Begin a period of staying with a selected modulation mode.
1057 * Set "stay_in_tbl" flag to prevent any mode switches.
1058 * Set frame tx success limits according to legacy vs. high-throughput,
1059 * and reset overall (spanning all rates) tx success history statistics.
1060 * These control how long we stay using same modulation mode before
1061 * searching for a new mode.
1063 static void rs_set_stay_in_table(u8 is_legacy
,
1064 struct iwl4965_lq_sta
*lq_sta
)
1066 IWL_DEBUG_HT("we are staying in the same table\n");
1067 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
1069 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
1070 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
1071 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
1073 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
1074 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
1075 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
1077 lq_sta
->table_count
= 0;
1078 lq_sta
->total_failed
= 0;
1079 lq_sta
->total_success
= 0;
1083 * Find correct throughput table for given mode of modulation
1085 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta
*lq_sta
,
1086 struct iwl4965_scale_tbl_info
*tbl
)
1088 if (is_legacy(tbl
->lq_type
)) {
1089 if (!is_a_band(tbl
->lq_type
))
1090 tbl
->expected_tpt
= expected_tpt_G
;
1092 tbl
->expected_tpt
= expected_tpt_A
;
1093 } else if (is_siso(tbl
->lq_type
)) {
1094 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1096 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
1098 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
1099 else if (tbl
->is_SGI
)
1100 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
1102 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1104 } else if (is_mimo(tbl
->lq_type
)) {
1105 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1107 tbl
->expected_tpt
= expected_tpt_mimo40MHzSGI
;
1109 tbl
->expected_tpt
= expected_tpt_mimo40MHz
;
1110 else if (tbl
->is_SGI
)
1111 tbl
->expected_tpt
= expected_tpt_mimo20MHzSGI
;
1113 tbl
->expected_tpt
= expected_tpt_mimo20MHz
;
1115 tbl
->expected_tpt
= expected_tpt_G
;
1118 #ifdef CONFIG_IWL4965_HT
1120 * Find starting rate for new "search" high-throughput mode of modulation.
1121 * Goal is to find lowest expected rate (under perfect conditions) that is
1122 * above the current measured throughput of "active" mode, to give new mode
1123 * a fair chance to prove itself without too many challenges.
1125 * This gets called when transitioning to more aggressive modulation
1126 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1127 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1128 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1129 * bit rate will typically need to increase, but not if performance was bad.
1131 static s32
rs_get_best_rate(struct iwl4965_priv
*priv
,
1132 struct iwl4965_lq_sta
*lq_sta
,
1133 struct iwl4965_scale_tbl_info
*tbl
, /* "search" */
1134 u16 rate_mask
, s8 index
, s8 rate
)
1136 /* "active" values */
1137 struct iwl4965_scale_tbl_info
*active_tbl
=
1138 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1139 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1140 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1142 /* expected "search" throughput */
1143 s32
*tpt_tbl
= tbl
->expected_tpt
;
1145 s32 new_rate
, high
, low
, start_hi
;
1148 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1151 high_low
= rs_get_adjacent_rate(rate
, rate_mask
, tbl
->lq_type
);
1153 low
= high_low
& 0xff;
1154 high
= (high_low
>> 8) & 0xff;
1157 * Lower the "search" bit rate, to give new "search" mode
1158 * approximately the same throughput as "active" if:
1160 * 1) "Active" mode has been working modestly well (but not
1161 * great), and expected "search" throughput (under perfect
1162 * conditions) at candidate rate is above the actual
1163 * measured "active" throughput (but less than expected
1164 * "active" throughput under perfect conditions).
1166 * 2) "Active" mode has been working perfectly or very well
1167 * and expected "search" throughput (under perfect
1168 * conditions) at candidate rate is above expected
1169 * "active" throughput (under perfect conditions).
1171 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1172 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1173 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1174 (tpt_tbl
[rate
] <= active_tpt
))) ||
1175 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1176 (tpt_tbl
[rate
] > active_tpt
))) {
1178 /* (2nd or later pass)
1179 * If we've already tried to raise the rate, and are
1180 * now trying to lower it, use the higher rate. */
1181 if (start_hi
!= IWL_RATE_INVALID
) {
1182 new_rate
= start_hi
;
1188 /* Loop again with lower rate */
1189 if (low
!= IWL_RATE_INVALID
)
1192 /* Lower rate not available, use the original */
1196 /* Else try to raise the "search" rate to match "active" */
1198 /* (2nd or later pass)
1199 * If we've already tried to lower the rate, and are
1200 * now trying to raise it, use the lower rate. */
1201 if (new_rate
!= IWL_RATE_INVALID
)
1204 /* Loop again with higher rate */
1205 else if (high
!= IWL_RATE_INVALID
) {
1209 /* Higher rate not available, use the original */
1219 #endif /* CONFIG_IWL4965_HT */
1221 static inline u8
rs_is_both_ant_supp(u8 valid_antenna
)
1223 return (rs_is_ant_connected(valid_antenna
, ANT_BOTH
));
1227 * Set up search table for MIMO
1229 static int rs_switch_to_mimo(struct iwl4965_priv
*priv
,
1230 struct iwl4965_lq_sta
*lq_sta
,
1231 struct ieee80211_conf
*conf
,
1232 struct sta_info
*sta
,
1233 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1235 #ifdef CONFIG_IWL4965_HT
1238 s8 is_green
= lq_sta
->is_green
;
1240 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1241 !sta
->ht_info
.ht_supported
)
1244 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1245 tbl
->lq_type
= LQ_MIMO
;
1246 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
,
1249 if (priv
->current_ht_config
.tx_mimo_ps_mode
== IWL_MIMO_PS_STATIC
)
1252 /* Need both Tx chains/antennas to support MIMO */
1253 if (!rs_is_both_ant_supp(lq_sta
->antenna
))
1256 tbl
->is_dup
= lq_sta
->is_dup
;
1258 if (priv
->current_ht_config
.supported_chan_width
1259 == IWL_CHANNEL_WIDTH_40MHZ
)
1265 if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_40MHZ_ONLY
)
1269 } else if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_20MHZ_ONLY
)
1274 rs_get_expected_tpt_table(lq_sta
, tbl
);
1276 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
, index
);
1278 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate
, rate_mask
);
1279 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
))
1281 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, rate
, is_green
);
1283 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1284 tbl
->current_rate
.rate_n_flags
, is_green
);
1288 #endif /*CONFIG_IWL4965_HT */
1292 * Set up search table for SISO
1294 static int rs_switch_to_siso(struct iwl4965_priv
*priv
,
1295 struct iwl4965_lq_sta
*lq_sta
,
1296 struct ieee80211_conf
*conf
,
1297 struct sta_info
*sta
,
1298 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1300 #ifdef CONFIG_IWL4965_HT
1302 u8 is_green
= lq_sta
->is_green
;
1305 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1306 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1307 !sta
->ht_info
.ht_supported
)
1310 tbl
->is_dup
= lq_sta
->is_dup
;
1311 tbl
->lq_type
= LQ_SISO
;
1313 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
,
1316 if (priv
->current_ht_config
.supported_chan_width
1317 == IWL_CHANNEL_WIDTH_40MHZ
)
1323 if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_40MHZ_ONLY
)
1327 } else if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_20MHZ_ONLY
)
1335 rs_get_expected_tpt_table(lq_sta
, tbl
);
1336 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
, index
);
1338 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1339 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1340 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1344 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, rate
, is_green
);
1345 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1346 tbl
->current_rate
.rate_n_flags
, is_green
);
1351 #endif /*CONFIG_IWL4965_HT */
1355 * Try to switch to new modulation mode from legacy
1357 static int rs_move_legacy_other(struct iwl4965_priv
*priv
,
1358 struct iwl4965_lq_sta
*lq_sta
,
1359 struct ieee80211_conf
*conf
,
1360 struct sta_info
*sta
,
1364 struct iwl4965_scale_tbl_info
*tbl
=
1365 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1366 struct iwl4965_scale_tbl_info
*search_tbl
=
1367 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1368 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1369 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1370 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1371 u8 start_action
= tbl
->action
;
1374 switch (tbl
->action
) {
1375 case IWL_LEGACY_SWITCH_ANTENNA
:
1376 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1378 search_tbl
->lq_type
= LQ_NONE
;
1379 lq_sta
->action_counter
++;
1381 /* Don't change antenna if success has been great */
1382 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1385 /* Don't change antenna if other one is not connected */
1386 if (!rs_is_other_ant_connected(lq_sta
->antenna
,
1390 /* Set up search table to try other antenna */
1391 memcpy(search_tbl
, tbl
, sz
);
1393 rs_toggle_antenna(&(search_tbl
->current_rate
),
1395 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1396 lq_sta
->search_better_tbl
= 1;
1399 case IWL_LEGACY_SWITCH_SISO
:
1400 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1402 /* Set up search table to try SISO */
1403 memcpy(search_tbl
, tbl
, sz
);
1404 search_tbl
->lq_type
= LQ_SISO
;
1405 search_tbl
->is_SGI
= 0;
1406 search_tbl
->is_fat
= 0;
1407 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1410 lq_sta
->search_better_tbl
= 1;
1411 lq_sta
->action_counter
= 0;
1416 case IWL_LEGACY_SWITCH_MIMO
:
1417 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1419 /* Set up search table to try MIMO */
1420 memcpy(search_tbl
, tbl
, sz
);
1421 search_tbl
->lq_type
= LQ_MIMO
;
1422 search_tbl
->is_SGI
= 0;
1423 search_tbl
->is_fat
= 0;
1424 search_tbl
->antenna_type
= ANT_BOTH
;
1425 ret
= rs_switch_to_mimo(priv
, lq_sta
, conf
, sta
,
1428 lq_sta
->search_better_tbl
= 1;
1429 lq_sta
->action_counter
= 0;
1435 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO
)
1436 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1438 if (tbl
->action
== start_action
)
1446 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO
)
1447 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1453 * Try to switch to new modulation mode from SISO
1455 static int rs_move_siso_to_other(struct iwl4965_priv
*priv
,
1456 struct iwl4965_lq_sta
*lq_sta
,
1457 struct ieee80211_conf
*conf
,
1458 struct sta_info
*sta
,
1462 u8 is_green
= lq_sta
->is_green
;
1463 struct iwl4965_scale_tbl_info
*tbl
=
1464 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1465 struct iwl4965_scale_tbl_info
*search_tbl
=
1466 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1467 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1468 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1469 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1470 u8 start_action
= tbl
->action
;
1473 lq_sta
->action_counter
++;
1474 switch (tbl
->action
) {
1475 case IWL_SISO_SWITCH_ANTENNA
:
1476 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1477 search_tbl
->lq_type
= LQ_NONE
;
1478 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1480 if (!rs_is_other_ant_connected(lq_sta
->antenna
,
1484 memcpy(search_tbl
, tbl
, sz
);
1485 search_tbl
->action
= IWL_SISO_SWITCH_MIMO
;
1486 rs_toggle_antenna(&(search_tbl
->current_rate
),
1488 lq_sta
->search_better_tbl
= 1;
1492 case IWL_SISO_SWITCH_MIMO
:
1493 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1494 memcpy(search_tbl
, tbl
, sz
);
1495 search_tbl
->lq_type
= LQ_MIMO
;
1496 search_tbl
->is_SGI
= 0;
1497 search_tbl
->is_fat
= 0;
1498 search_tbl
->antenna_type
= ANT_BOTH
;
1499 ret
= rs_switch_to_mimo(priv
, lq_sta
, conf
, sta
,
1502 lq_sta
->search_better_tbl
= 1;
1506 case IWL_SISO_SWITCH_GI
:
1507 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1509 memcpy(search_tbl
, tbl
, sz
);
1510 search_tbl
->action
= 0;
1511 if (search_tbl
->is_SGI
)
1512 search_tbl
->is_SGI
= 0;
1514 search_tbl
->is_SGI
= 1;
1517 lq_sta
->search_better_tbl
= 1;
1518 if ((tbl
->lq_type
== LQ_SISO
) &&
1520 s32 tpt
= lq_sta
->last_tpt
/ 100;
1521 if (((!tbl
->is_fat
) &&
1522 (tpt
>= expected_tpt_siso20MHz
[index
])) ||
1524 (tpt
>= expected_tpt_siso40MHz
[index
])))
1525 lq_sta
->search_better_tbl
= 0;
1527 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1528 rs_mcs_from_tbl(&search_tbl
->current_rate
,
1529 search_tbl
, index
, is_green
);
1533 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1534 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1536 if (tbl
->action
== start_action
)
1543 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1544 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1549 * Try to switch to new modulation mode from MIMO
1551 static int rs_move_mimo_to_other(struct iwl4965_priv
*priv
,
1552 struct iwl4965_lq_sta
*lq_sta
,
1553 struct ieee80211_conf
*conf
,
1554 struct sta_info
*sta
,
1558 s8 is_green
= lq_sta
->is_green
;
1559 struct iwl4965_scale_tbl_info
*tbl
=
1560 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1561 struct iwl4965_scale_tbl_info
*search_tbl
=
1562 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1563 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1564 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1565 u8 start_action
= tbl
->action
;
1568 lq_sta
->action_counter
++;
1569 switch (tbl
->action
) {
1570 case IWL_MIMO_SWITCH_ANTENNA_A
:
1571 case IWL_MIMO_SWITCH_ANTENNA_B
:
1572 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1575 /* Set up new search table for SISO */
1576 memcpy(search_tbl
, tbl
, sz
);
1577 search_tbl
->lq_type
= LQ_SISO
;
1578 search_tbl
->is_SGI
= 0;
1579 search_tbl
->is_fat
= 0;
1580 if (tbl
->action
== IWL_MIMO_SWITCH_ANTENNA_A
)
1581 search_tbl
->antenna_type
= ANT_MAIN
;
1583 search_tbl
->antenna_type
= ANT_AUX
;
1585 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1588 lq_sta
->search_better_tbl
= 1;
1593 case IWL_MIMO_SWITCH_GI
:
1594 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1596 /* Set up new search table for MIMO */
1597 memcpy(search_tbl
, tbl
, sz
);
1598 search_tbl
->lq_type
= LQ_MIMO
;
1599 search_tbl
->antenna_type
= ANT_BOTH
;
1600 search_tbl
->action
= 0;
1601 if (search_tbl
->is_SGI
)
1602 search_tbl
->is_SGI
= 0;
1604 search_tbl
->is_SGI
= 1;
1605 lq_sta
->search_better_tbl
= 1;
1608 * If active table already uses the fastest possible
1609 * modulation (dual stream with short guard interval),
1610 * and it's working well, there's no need to look
1611 * for a better type of modulation!
1613 if ((tbl
->lq_type
== LQ_MIMO
) &&
1615 s32 tpt
= lq_sta
->last_tpt
/ 100;
1616 if (((!tbl
->is_fat
) &&
1617 (tpt
>= expected_tpt_mimo20MHz
[index
])) ||
1619 (tpt
>= expected_tpt_mimo40MHz
[index
])))
1620 lq_sta
->search_better_tbl
= 0;
1622 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1623 rs_mcs_from_tbl(&search_tbl
->current_rate
,
1624 search_tbl
, index
, is_green
);
1629 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1630 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1632 if (tbl
->action
== start_action
)
1639 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1640 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1646 * Check whether we should continue using same modulation mode, or
1647 * begin search for a new mode, based on:
1648 * 1) # tx successes or failures while using this mode
1649 * 2) # times calling this function
1650 * 3) elapsed time in this mode (not used, for now)
1652 static void rs_stay_in_table(struct iwl4965_lq_sta
*lq_sta
)
1654 struct iwl4965_scale_tbl_info
*tbl
;
1657 int flush_interval_passed
= 0;
1659 active_tbl
= lq_sta
->active_tbl
;
1661 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1663 /* If we've been disallowing search, see if we should now allow it */
1664 if (lq_sta
->stay_in_tbl
) {
1666 /* Elapsed time using current modulation mode */
1667 if (lq_sta
->flush_timer
)
1668 flush_interval_passed
=
1670 (unsigned long)(lq_sta
->flush_timer
+
1671 IWL_RATE_SCALE_FLUSH_INTVL
));
1673 /* For now, disable the elapsed time criterion */
1674 flush_interval_passed
= 0;
1677 * Check if we should allow search for new modulation mode.
1678 * If many frames have failed or succeeded, or we've used
1679 * this same modulation for a long time, allow search, and
1680 * reset history stats that keep track of whether we should
1681 * allow a new search. Also (below) reset all bitmaps and
1682 * stats in active history.
1684 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1685 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1686 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1687 && (flush_interval_passed
))) {
1688 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1689 lq_sta
->total_failed
,
1690 lq_sta
->total_success
,
1691 flush_interval_passed
);
1693 /* Allow search for new mode */
1694 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1695 lq_sta
->total_failed
= 0;
1696 lq_sta
->total_success
= 0;
1697 lq_sta
->flush_timer
= 0;
1700 * Else if we've used this modulation mode enough repetitions
1701 * (regardless of elapsed time or success/failure), reset
1702 * history bitmaps and rate-specific stats for all rates in
1706 lq_sta
->table_count
++;
1707 if (lq_sta
->table_count
>=
1708 lq_sta
->table_count_limit
) {
1709 lq_sta
->table_count
= 0;
1711 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1712 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1713 rs_rate_scale_clear_window(
1718 /* If transitioning to allow "search", reset all history
1719 * bitmaps and stats in active table (this will become the new
1720 * "search" table). */
1721 if (!lq_sta
->stay_in_tbl
) {
1722 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1723 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1729 * Do rate scaling and search for new modulation mode.
1731 static void rs_rate_scale_perform(struct iwl4965_priv
*priv
,
1732 struct net_device
*dev
,
1733 struct ieee80211_hdr
*hdr
,
1734 struct sta_info
*sta
)
1736 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1737 struct ieee80211_hw
*hw
= local_to_hw(local
);
1738 struct ieee80211_conf
*conf
= &hw
->conf
;
1739 int low
= IWL_RATE_INVALID
;
1740 int high
= IWL_RATE_INVALID
;
1743 struct iwl4965_rate_scale_data
*window
= NULL
;
1744 int current_tpt
= IWL_INVALID_VALUE
;
1745 int low_tpt
= IWL_INVALID_VALUE
;
1746 int high_tpt
= IWL_INVALID_VALUE
;
1748 s8 scale_action
= 0;
1751 struct iwl4965_lq_sta
*lq_sta
;
1752 struct iwl4965_scale_tbl_info
*tbl
, *tbl1
;
1753 u16 rate_scale_index_msk
= 0;
1754 struct iwl4965_rate mcs_rate
;
1759 #ifdef CONFIG_IWL4965_HT
1760 u8 tid
= MAX_TID_COUNT
;
1764 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1766 fc
= le16_to_cpu(hdr
->frame_control
);
1767 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
)) {
1768 /* Send management frames and broadcast/multicast data using
1770 /* TODO: this could probably be improved.. */
1774 if (!sta
|| !sta
->rate_ctrl_priv
)
1777 if (!priv
->lq_mngr
.lq_ready
) {
1778 IWL_DEBUG_RATE("still rate scaling not ready\n");
1781 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
1783 #ifdef CONFIG_IWL4965_HT
1784 qc
= ieee80211_get_qos_ctrl(hdr
);
1786 tid
= (u8
)(le16_to_cpu(*qc
) & 0xf);
1787 rs_tl_add_packet(lq_sta
, tid
);
1791 * Select rate-scale / modulation-mode table to work with in
1792 * the rest of this function: "search" if searching for better
1793 * modulation mode, or "active" if doing rate scaling within a mode.
1795 if (!lq_sta
->search_better_tbl
)
1796 active_tbl
= lq_sta
->active_tbl
;
1798 active_tbl
= 1 - lq_sta
->active_tbl
;
1800 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1801 is_green
= lq_sta
->is_green
;
1803 /* current tx rate */
1804 index
= sta
->last_txrate_idx
;
1806 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index
,
1809 /* rates available for this association, and for modulation mode */
1810 rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
,
1813 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask
);
1815 /* mask with station rate restriction */
1816 if (is_legacy(tbl
->lq_type
)) {
1817 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1818 /* supp_rates has no CCK bits in A mode */
1819 rate_scale_index_msk
= (u16
) (rate_mask
&
1820 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
1822 rate_scale_index_msk
= (u16
) (rate_mask
&
1823 lq_sta
->supp_rates
);
1826 rate_scale_index_msk
= rate_mask
;
1828 if (!rate_scale_index_msk
)
1829 rate_scale_index_msk
= rate_mask
;
1831 /* If current rate is no longer supported on current association,
1832 * or user changed preferences for rates, find a new supported rate. */
1833 if (index
< 0 || !((1 << index
) & rate_scale_index_msk
)) {
1834 index
= IWL_INVALID_VALUE
;
1837 /* get the highest available rate */
1838 for (i
= 0; i
<= IWL_RATE_COUNT
; i
++) {
1839 if ((1 << i
) & rate_scale_index_msk
)
1843 if (index
== IWL_INVALID_VALUE
) {
1844 IWL_WARNING("Can not find a suitable rate\n");
1849 /* Get expected throughput table and history window for current rate */
1850 if (!tbl
->expected_tpt
)
1851 rs_get_expected_tpt_table(lq_sta
, tbl
);
1853 window
= &(tbl
->win
[index
]);
1856 * If there is not enough history to calculate actual average
1857 * throughput, keep analyzing results of more tx frames, without
1858 * changing rate or mode (bypass most of the rest of this function).
1859 * Set up new rate table in uCode only if old rate is not supported
1860 * in current association (use new rate found above).
1862 fail_count
= window
->counter
- window
->success_counter
;
1863 if (((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
1864 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
))
1865 || (tbl
->expected_tpt
== NULL
)) {
1866 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1868 window
->success_counter
, window
->counter
, index
);
1870 /* Can't calculate this yet; not enough history */
1871 window
->average_tpt
= IWL_INVALID_VALUE
;
1873 /* Should we stay with this modulation mode,
1874 * or search for a new one? */
1875 rs_stay_in_table(lq_sta
);
1877 /* Set up new rate table in uCode, if needed */
1879 rs_mcs_from_tbl(&mcs_rate
, tbl
, index
, is_green
);
1880 rs_fill_link_cmd(lq_sta
, &mcs_rate
, &lq_sta
->lq
);
1881 rs_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1885 /* Else we have enough samples; calculate estimate of
1886 * actual average throughput */
1888 window
->average_tpt
= ((window
->success_ratio
*
1889 tbl
->expected_tpt
[index
] + 64) / 128);
1891 /* If we are searching for better modulation mode, check success. */
1892 if (lq_sta
->search_better_tbl
) {
1893 int success_limit
= IWL_RATE_SCALE_SWITCH
;
1895 /* If good success, continue using the "search" mode;
1896 * no need to send new link quality command, since we're
1897 * continuing to use the setup that we've been trying. */
1898 if ((window
->success_ratio
> success_limit
) ||
1899 (window
->average_tpt
> lq_sta
->last_tpt
)) {
1900 if (!is_legacy(tbl
->lq_type
)) {
1901 IWL_DEBUG_HT("LQ: we are switching to HT"
1902 " rate suc %d current tpt %d"
1904 window
->success_ratio
,
1905 window
->average_tpt
,
1907 lq_sta
->enable_counter
= 1;
1909 /* Swap tables; "search" becomes "active" */
1910 lq_sta
->active_tbl
= active_tbl
;
1911 current_tpt
= window
->average_tpt
;
1913 /* Else poor success; go back to mode in "active" table */
1915 /* Nullify "search" table */
1916 tbl
->lq_type
= LQ_NONE
;
1918 /* Revert to "active" table */
1919 active_tbl
= lq_sta
->active_tbl
;
1920 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1922 /* Revert to "active" rate and throughput info */
1923 index
= iwl4965_hwrate_to_plcp_idx(
1924 tbl
->current_rate
.rate_n_flags
);
1925 current_tpt
= lq_sta
->last_tpt
;
1927 /* Need to set up a new rate table in uCode */
1929 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1932 /* Either way, we've made a decision; modulation mode
1933 * search is done, allow rate adjustment next time. */
1934 lq_sta
->search_better_tbl
= 0;
1935 done_search
= 1; /* Don't switch modes below! */
1939 /* (Else) not in search of better modulation mode, try for better
1940 * starting rate, while staying in this mode. */
1941 high_low
= rs_get_adjacent_rate(index
, rate_scale_index_msk
,
1943 low
= high_low
& 0xff;
1944 high
= (high_low
>> 8) & 0xff;
1946 /* Collect measured throughputs for current and adjacent rates */
1947 current_tpt
= window
->average_tpt
;
1948 if (low
!= IWL_RATE_INVALID
)
1949 low_tpt
= tbl
->win
[low
].average_tpt
;
1950 if (high
!= IWL_RATE_INVALID
)
1951 high_tpt
= tbl
->win
[high
].average_tpt
;
1953 /* Assume rate increase */
1956 /* Too many failures, decrease rate */
1957 if ((window
->success_ratio
<= IWL_RATE_DECREASE_TH
) ||
1958 (current_tpt
== 0)) {
1959 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1962 /* No throughput measured yet for adjacent rates; try increase. */
1963 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
1964 (high_tpt
== IWL_INVALID_VALUE
))
1967 /* Both adjacent throughputs are measured, but neither one has better
1968 * throughput; we're using the best rate, don't change it! */
1969 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1970 (high_tpt
!= IWL_INVALID_VALUE
) &&
1971 (low_tpt
< current_tpt
) &&
1972 (high_tpt
< current_tpt
))
1975 /* At least one adjacent rate's throughput is measured,
1976 * and may have better performance. */
1978 /* Higher adjacent rate's throughput is measured */
1979 if (high_tpt
!= IWL_INVALID_VALUE
) {
1980 /* Higher rate has better throughput */
1981 if (high_tpt
> current_tpt
)
1985 ("decrease rate because of high tpt\n");
1989 /* Lower adjacent rate's throughput is measured */
1990 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
1991 /* Lower rate has better throughput */
1992 if (low_tpt
> current_tpt
) {
1994 ("decrease rate because of low tpt\n");
2001 /* Sanity check; asked for decrease, but success rate or throughput
2002 * has been good at old rate. Don't change it. */
2003 if (scale_action
== -1) {
2004 if ((low
!= IWL_RATE_INVALID
) &&
2005 ((window
->success_ratio
> IWL_RATE_HIGH_TH
) ||
2006 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
2009 /* Sanity check; asked for increase, but success rate has not been great
2010 * even at old rate, higher rate will be worse. Don't change it. */
2011 } else if ((scale_action
== 1) &&
2012 (window
->success_ratio
< IWL_RATE_INCREASE_TH
))
2015 switch (scale_action
) {
2017 /* Decrease starting rate, update uCode's rate table */
2018 if (low
!= IWL_RATE_INVALID
) {
2024 /* Increase starting rate, update uCode's rate table */
2025 if (high
!= IWL_RATE_INVALID
) {
2037 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
2038 "high %d type %d\n",
2039 index
, scale_action
, low
, high
, tbl
->lq_type
);
2042 /* Replace uCode's rate table for the destination station. */
2044 rs_mcs_from_tbl(&mcs_rate
, tbl
, index
, is_green
);
2045 rs_fill_link_cmd(lq_sta
, &mcs_rate
, &lq_sta
->lq
);
2046 rs_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2049 /* Should we stay with this modulation mode, or search for a new one? */
2050 rs_stay_in_table(lq_sta
);
2053 * Search for new modulation mode if we're:
2054 * 1) Not changing rates right now
2055 * 2) Not just finishing up a search
2056 * 3) Allowing a new search
2058 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
) {
2059 /* Save current throughput to compare with "search" throughput*/
2060 lq_sta
->last_tpt
= current_tpt
;
2062 /* Select a new "search" modulation mode to try.
2063 * If one is found, set up the new "search" table. */
2064 if (is_legacy(tbl
->lq_type
))
2065 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
2066 else if (is_siso(tbl
->lq_type
))
2067 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
2069 rs_move_mimo_to_other(priv
, lq_sta
, conf
, sta
, index
);
2071 /* If new "search" mode was selected, set up in uCode table */
2072 if (lq_sta
->search_better_tbl
) {
2073 /* Access the "search" table, clear its history. */
2074 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2075 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2076 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2078 /* Use new "search" start rate */
2079 index
= iwl4965_hwrate_to_plcp_idx(
2080 tbl
->current_rate
.rate_n_flags
);
2082 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
2083 tbl
->current_rate
.rate_n_flags
, index
);
2084 rs_fill_link_cmd(lq_sta
, &tbl
->current_rate
,
2086 rs_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2089 /* If the "active" (non-search) mode was legacy,
2090 * and we've tried switching antennas,
2091 * but we haven't been able to try HT modes (not available),
2092 * stay with best antenna legacy modulation for a while
2093 * before next round of mode comparisons. */
2094 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2095 if (is_legacy(tbl1
->lq_type
) &&
2096 #ifdef CONFIG_IWL4965_HT
2097 (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
)) &&
2099 (lq_sta
->action_counter
>= 1)) {
2100 lq_sta
->action_counter
= 0;
2101 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
2102 rs_set_stay_in_table(1, lq_sta
);
2105 /* If we're in an HT mode, and all 3 mode switch actions
2106 * have been tried and compared, stay in this best modulation
2107 * mode for a while before next round of mode comparisons. */
2108 if (lq_sta
->enable_counter
&&
2109 (lq_sta
->action_counter
>= IWL_ACTION_LIMIT
)) {
2110 #ifdef CONFIG_IWL4965_HT
2111 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2112 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2113 (tid
!= MAX_TID_COUNT
)) {
2114 IWL_DEBUG_HT("try to aggregate tid %d\n", tid
);
2115 rs_tl_turn_on_agg(priv
, tid
, lq_sta
, sta
);
2117 #endif /*CONFIG_IWL4965_HT */
2118 lq_sta
->action_counter
= 0;
2119 rs_set_stay_in_table(0, lq_sta
);
2123 * Else, don't search for a new modulation mode.
2124 * Put new timestamp in stay-in-modulation-mode flush timer if:
2125 * 1) Not changing rates right now
2126 * 2) Not just finishing up a search
2127 * 3) flush timer is empty
2130 if ((!update_lq
) && (!done_search
) && (!lq_sta
->flush_timer
))
2131 lq_sta
->flush_timer
= jiffies
;
2135 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, index
, is_green
);
2137 sta
->last_txrate_idx
= i
;
2139 /* sta->txrate_idx is an index to A mode rates which start
2140 * at IWL_FIRST_OFDM_RATE
2142 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2143 sta
->txrate_idx
= i
- IWL_FIRST_OFDM_RATE
;
2145 sta
->txrate_idx
= i
;
2151 static void rs_initialize_lq(struct iwl4965_priv
*priv
,
2152 struct ieee80211_conf
*conf
,
2153 struct sta_info
*sta
)
2156 struct iwl4965_lq_sta
*lq_sta
;
2157 struct iwl4965_scale_tbl_info
*tbl
;
2160 u8 use_green
= rs_use_green(priv
, conf
);
2161 struct iwl4965_rate mcs_rate
;
2163 if (!sta
|| !sta
->rate_ctrl_priv
)
2166 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2167 i
= sta
->last_txrate_idx
;
2169 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2170 (priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
))
2173 if (!lq_sta
->search_better_tbl
)
2174 active_tbl
= lq_sta
->active_tbl
;
2176 active_tbl
= 1 - lq_sta
->active_tbl
;
2178 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2180 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2183 mcs_rate
.rate_n_flags
= iwl4965_rates
[i
].plcp
;
2184 mcs_rate
.rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
2185 mcs_rate
.rate_n_flags
&= ~RATE_MCS_ANT_A_MSK
;
2187 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2188 mcs_rate
.rate_n_flags
|= RATE_MCS_CCK_MSK
;
2190 tbl
->antenna_type
= ANT_AUX
;
2191 rs_get_tbl_info_from_mcs(&mcs_rate
, priv
->band
, tbl
, &rate_idx
);
2192 if (!rs_is_ant_connected(priv
->valid_antenna
, tbl
->antenna_type
))
2193 rs_toggle_antenna(&mcs_rate
, tbl
);
2195 rs_mcs_from_tbl(&mcs_rate
, tbl
, rate_idx
, use_green
);
2196 tbl
->current_rate
.rate_n_flags
= mcs_rate
.rate_n_flags
;
2197 rs_get_expected_tpt_table(lq_sta
, tbl
);
2198 rs_fill_link_cmd(lq_sta
, &mcs_rate
, &lq_sta
->lq
);
2199 rs_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2204 static void rs_get_rate(void *priv_rate
, struct net_device
*dev
,
2205 struct ieee80211_supported_band
*sband
,
2206 struct sk_buff
*skb
,
2207 struct rate_selection
*sel
)
2211 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
2212 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2213 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2214 struct sta_info
*sta
;
2216 struct iwl4965_priv
*priv
= (struct iwl4965_priv
*)priv_rate
;
2217 struct iwl4965_lq_sta
*lq_sta
;
2219 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2223 sta
= sta_info_get(local
, hdr
->addr1
);
2225 /* Send management frames and broadcast/multicast data using lowest
2227 fc
= le16_to_cpu(hdr
->frame_control
);
2228 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
) ||
2229 !sta
|| !sta
->rate_ctrl_priv
) {
2230 sel
->rate
= rate_lowest(local
, sband
, sta
);
2234 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2235 i
= sta
->last_txrate_idx
;
2237 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
2238 !lq_sta
->ibss_sta_added
) {
2239 u8 sta_id
= iwl4965_hw_find_station(priv
, hdr
->addr1
);
2240 DECLARE_MAC_BUF(mac
);
2242 if (sta_id
== IWL_INVALID_STATION
) {
2243 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2244 print_mac(mac
, hdr
->addr1
));
2245 sta_id
= iwl4965_add_station_flags(priv
, hdr
->addr1
,
2246 0, CMD_ASYNC
, NULL
);
2248 if ((sta_id
!= IWL_INVALID_STATION
)) {
2249 lq_sta
->lq
.sta_id
= sta_id
;
2250 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2251 lq_sta
->ibss_sta_added
= 1;
2252 rs_initialize_lq(priv
, conf
, sta
);
2254 if (!lq_sta
->ibss_sta_added
)
2259 if ((i
< 0) || (i
> IWL_RATE_COUNT
)) {
2260 sel
->rate
= rate_lowest(local
, sband
, sta
);
2264 sel
->rate
= &priv
->ieee_rates
[i
];
2269 static void *rs_alloc_sta(void *priv
, gfp_t gfp
)
2271 struct iwl4965_lq_sta
*lq_sta
;
2274 IWL_DEBUG_RATE("create station rate scale window\n");
2276 lq_sta
= kzalloc(sizeof(struct iwl4965_lq_sta
), gfp
);
2280 lq_sta
->lq
.sta_id
= 0xff;
2283 for (j
= 0; j
< LQ_SIZE
; j
++)
2284 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2285 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2290 static void rs_rate_init(void *priv_rate
, void *priv_sta
,
2291 struct ieee80211_local
*local
,
2292 struct sta_info
*sta
)
2295 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2296 struct ieee80211_supported_band
*sband
;
2297 struct iwl4965_priv
*priv
= (struct iwl4965_priv
*)priv_rate
;
2298 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2300 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
2302 lq_sta
->flush_timer
= 0;
2303 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2304 sta
->txrate_idx
= 3;
2305 for (j
= 0; j
< LQ_SIZE
; j
++)
2306 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2307 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2309 IWL_DEBUG_RATE("rate scale global init\n");
2310 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2311 * the lowest or the highest rate.. Could consider using RSSI from
2312 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2315 lq_sta
->ibss_sta_added
= 0;
2316 if (priv
->iw_mode
== IEEE80211_IF_TYPE_AP
) {
2317 u8 sta_id
= iwl4965_hw_find_station(priv
, sta
->addr
);
2318 DECLARE_MAC_BUF(mac
);
2320 /* for IBSS the call are from tasklet */
2321 IWL_DEBUG_HT("LQ: ADD station %s\n",
2322 print_mac(mac
, sta
->addr
));
2324 if (sta_id
== IWL_INVALID_STATION
) {
2325 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2326 print_mac(mac
, sta
->addr
));
2327 sta_id
= iwl4965_add_station_flags(priv
, sta
->addr
,
2328 0, CMD_ASYNC
, NULL
);
2330 if ((sta_id
!= IWL_INVALID_STATION
)) {
2331 lq_sta
->lq
.sta_id
= sta_id
;
2332 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2334 /* FIXME: this is w/a remove it later */
2335 priv
->assoc_station_added
= 1;
2338 /* Find highest tx rate supported by hardware and destination station */
2339 for (i
= 0; i
< sband
->n_bitrates
; i
++)
2340 if (sta
->supp_rates
[sband
->band
] & BIT(i
))
2341 sta
->txrate_idx
= i
;
2343 sta
->last_txrate_idx
= sta
->txrate_idx
;
2344 /* WTF is with this bogus comment? A doesn't have cck rates */
2345 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2346 if (local
->hw
.conf
.channel
->band
== IEEE80211_BAND_5GHZ
)
2347 sta
->last_txrate_idx
+= IWL_FIRST_OFDM_RATE
;
2350 lq_sta
->valid_antenna
= priv
->valid_antenna
;
2351 lq_sta
->antenna
= priv
->antenna
;
2352 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2353 lq_sta
->active_rate
= priv
->active_rate
;
2354 lq_sta
->active_rate
&= ~(0x1000);
2355 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2356 lq_sta
->band
= priv
->band
;
2357 #ifdef CONFIG_IWL4965_HT
2359 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2360 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2362 lq_sta
->active_siso_rate
= (priv
->current_ht_config
.supp_mcs_set
[0] << 1);
2363 lq_sta
->active_siso_rate
|=
2364 (priv
->current_ht_config
.supp_mcs_set
[0] & 0x1);
2365 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2366 lq_sta
->active_siso_rate
=
2367 lq_sta
->active_siso_rate
<< IWL_FIRST_OFDM_RATE
;
2370 lq_sta
->active_mimo_rate
= (priv
->current_ht_config
.supp_mcs_set
[1] << 1);
2371 lq_sta
->active_mimo_rate
|=
2372 (priv
->current_ht_config
.supp_mcs_set
[1] & 0x1);
2373 lq_sta
->active_mimo_rate
&= ~((u16
)0x2);
2374 lq_sta
->active_mimo_rate
=
2375 lq_sta
->active_mimo_rate
<< IWL_FIRST_OFDM_RATE
;
2376 IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
2377 lq_sta
->active_siso_rate
,
2378 lq_sta
->active_mimo_rate
);
2379 /* as default allow aggregation for all tids */
2380 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2381 #endif /*CONFIG_IWL4965_HT*/
2382 #ifdef CONFIG_MAC80211_DEBUGFS
2386 if (priv
->assoc_station_added
)
2387 priv
->lq_mngr
.lq_ready
= 1;
2389 rs_initialize_lq(priv
, conf
, sta
);
2392 static void rs_fill_link_cmd(struct iwl4965_lq_sta
*lq_sta
,
2393 struct iwl4965_rate
*tx_mcs
,
2394 struct iwl4965_link_quality_cmd
*lq_cmd
)
2398 int repeat_rate
= 0;
2399 u8 ant_toggle_count
= 0;
2400 u8 use_ht_possible
= 1;
2401 struct iwl4965_rate new_rate
;
2402 struct iwl4965_scale_tbl_info tbl_type
= { 0 };
2404 /* Override starting rate (index 0) if needed for debug purposes */
2405 rs_dbgfs_set_mcs(lq_sta
, tx_mcs
, index
);
2407 /* Interpret rate_n_flags */
2408 rs_get_tbl_info_from_mcs(tx_mcs
, lq_sta
->band
,
2409 &tbl_type
, &rate_idx
);
2411 /* How many times should we repeat the initial rate? */
2412 if (is_legacy(tbl_type
.lq_type
)) {
2413 ant_toggle_count
= 1;
2414 repeat_rate
= IWL_NUMBER_TRY
;
2416 repeat_rate
= IWL_HT_NUMBER_TRY
;
2418 lq_cmd
->general_params
.mimo_delimiter
=
2419 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2421 /* Fill 1st table entry (index 0) */
2422 lq_cmd
->rs_table
[index
].rate_n_flags
=
2423 cpu_to_le32(tx_mcs
->rate_n_flags
);
2424 new_rate
.rate_n_flags
= tx_mcs
->rate_n_flags
;
2426 if (is_mimo(tbl_type
.lq_type
) || (tbl_type
.antenna_type
== ANT_MAIN
))
2427 lq_cmd
->general_params
.single_stream_ant_msk
2428 = LINK_QUAL_ANT_A_MSK
;
2430 lq_cmd
->general_params
.single_stream_ant_msk
2431 = LINK_QUAL_ANT_B_MSK
;
2436 /* Fill rest of rate table */
2437 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2438 /* Repeat initial/next rate.
2439 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2440 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2441 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2442 if (is_legacy(tbl_type
.lq_type
)) {
2443 if (ant_toggle_count
<
2444 NUM_TRY_BEFORE_ANTENNA_TOGGLE
)
2447 rs_toggle_antenna(&new_rate
, &tbl_type
);
2448 ant_toggle_count
= 1;
2452 /* Override next rate if needed for debug purposes */
2453 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2455 /* Fill next table entry */
2456 lq_cmd
->rs_table
[index
].rate_n_flags
=
2457 cpu_to_le32(new_rate
.rate_n_flags
);
2462 rs_get_tbl_info_from_mcs(&new_rate
, lq_sta
->band
, &tbl_type
,
2465 /* Indicate to uCode which entries might be MIMO.
2466 * If initial rate was MIMO, this will finally end up
2467 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2468 if (is_mimo(tbl_type
.lq_type
))
2469 lq_cmd
->general_params
.mimo_delimiter
= index
;
2472 rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2473 use_ht_possible
, &new_rate
);
2475 /* How many times should we repeat the next rate? */
2476 if (is_legacy(tbl_type
.lq_type
)) {
2477 if (ant_toggle_count
< NUM_TRY_BEFORE_ANTENNA_TOGGLE
)
2480 rs_toggle_antenna(&new_rate
, &tbl_type
);
2481 ant_toggle_count
= 1;
2483 repeat_rate
= IWL_NUMBER_TRY
;
2485 repeat_rate
= IWL_HT_NUMBER_TRY
;
2487 /* Don't allow HT rates after next pass.
2488 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2489 use_ht_possible
= 0;
2491 /* Override next rate if needed for debug purposes */
2492 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2494 /* Fill next table entry */
2495 lq_cmd
->rs_table
[index
].rate_n_flags
=
2496 cpu_to_le32(new_rate
.rate_n_flags
);
2502 lq_cmd
->general_params
.dual_stream_ant_msk
= 3;
2503 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2504 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2507 static void *rs_alloc(struct ieee80211_local
*local
)
2509 return local
->hw
.priv
;
2511 /* rate scale requires free function to be implemented */
2512 static void rs_free(void *priv_rate
)
2517 static void rs_clear(void *priv_rate
)
2519 struct iwl4965_priv
*priv
= (struct iwl4965_priv
*) priv_rate
;
2521 IWL_DEBUG_RATE("enter\n");
2523 priv
->lq_mngr
.lq_ready
= 0;
2525 IWL_DEBUG_RATE("leave\n");
2528 static void rs_free_sta(void *priv
, void *priv_sta
)
2530 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2532 IWL_DEBUG_RATE("enter\n");
2534 IWL_DEBUG_RATE("leave\n");
2538 #ifdef CONFIG_MAC80211_DEBUGFS
2539 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2541 file
->private_data
= inode
->i_private
;
2544 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
2545 struct iwl4965_rate
*mcs
, int index
)
2549 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2554 if (lq_sta
->dbg_fixed
.rate_n_flags
) {
2556 mcs
->rate_n_flags
= lq_sta
->dbg_fixed
.rate_n_flags
;
2558 mcs
->rate_n_flags
= base_rate
;
2559 IWL_DEBUG_RATE("Fixed rate ON\n");
2563 IWL_DEBUG_RATE("Fixed rate OFF\n");
2566 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2567 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2569 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2574 memset(buf
, 0, sizeof(buf
));
2575 buf_size
= min(count
, sizeof(buf
) - 1);
2576 if (copy_from_user(buf
, user_buf
, buf_size
))
2579 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2580 lq_sta
->dbg_fixed
.rate_n_flags
= parsed_rate
;
2582 lq_sta
->dbg_fixed
.rate_n_flags
= 0;
2584 lq_sta
->active_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2585 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2586 lq_sta
->active_mimo_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2588 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2589 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed
.rate_n_flags
);
2591 if (lq_sta
->dbg_fixed
.rate_n_flags
) {
2592 rs_fill_link_cmd(lq_sta
, &lq_sta
->dbg_fixed
, &lq_sta
->lq
);
2593 rs_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2599 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2600 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2606 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2608 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2609 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2610 lq_sta
->total_failed
, lq_sta
->total_success
,
2611 lq_sta
->active_rate
);
2612 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2613 lq_sta
->dbg_fixed
.rate_n_flags
);
2614 desc
+= sprintf(buff
+desc
, "general:"
2615 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2616 lq_sta
->lq
.general_params
.flags
,
2617 lq_sta
->lq
.general_params
.mimo_delimiter
,
2618 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2619 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2621 desc
+= sprintf(buff
+desc
, "agg:"
2622 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2623 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2624 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2625 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2627 desc
+= sprintf(buff
+desc
,
2628 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2629 lq_sta
->lq
.general_params
.start_rate_index
[0],
2630 lq_sta
->lq
.general_params
.start_rate_index
[1],
2631 lq_sta
->lq
.general_params
.start_rate_index
[2],
2632 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2635 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
2636 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X\n",
2637 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2639 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2642 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2643 .write
= rs_sta_dbgfs_scale_table_write
,
2644 .read
= rs_sta_dbgfs_scale_table_read
,
2645 .open
= open_file_generic
,
2647 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2648 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2654 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2655 for (i
= 0; i
< LQ_SIZE
; i
++) {
2656 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2658 lq_sta
->active_tbl
== i
?"*":"x",
2659 lq_sta
->lq_info
[i
].lq_type
,
2660 lq_sta
->lq_info
[i
].is_SGI
,
2661 lq_sta
->lq_info
[i
].is_fat
,
2662 lq_sta
->lq_info
[i
].is_dup
,
2663 lq_sta
->lq_info
[i
].current_rate
.rate_n_flags
);
2664 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2665 desc
+= sprintf(buff
+desc
,
2666 "counter=%d success=%d %%=%d\n",
2667 lq_sta
->lq_info
[i
].win
[j
].counter
,
2668 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2669 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2672 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2675 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2676 .read
= rs_sta_dbgfs_stats_table_read
,
2677 .open
= open_file_generic
,
2680 static void rs_add_debugfs(void *priv
, void *priv_sta
,
2683 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2684 lq_sta
->rs_sta_dbgfs_scale_table_file
=
2685 debugfs_create_file("rate_scale_table", 0600, dir
,
2686 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
2687 lq_sta
->rs_sta_dbgfs_stats_table_file
=
2688 debugfs_create_file("rate_stats_table", 0600, dir
,
2689 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
2690 #ifdef CONFIG_IWL4965_HT
2691 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
2692 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
2693 &lq_sta
->tx_agg_tid_en
);
2698 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
2700 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2701 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
2702 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
2703 #ifdef CONFIG_IWL4965_HT
2704 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
2709 static struct rate_control_ops rs_ops
= {
2712 .tx_status
= rs_tx_status
,
2713 .get_rate
= rs_get_rate
,
2714 .rate_init
= rs_rate_init
,
2718 .alloc_sta
= rs_alloc_sta
,
2719 .free_sta
= rs_free_sta
,
2720 #ifdef CONFIG_MAC80211_DEBUGFS
2721 .add_sta_debugfs
= rs_add_debugfs
,
2722 .remove_sta_debugfs
= rs_remove_debugfs
,
2726 int iwl4965_fill_rs_info(struct ieee80211_hw
*hw
, char *buf
, u8 sta_id
)
2728 struct ieee80211_local
*local
= hw_to_local(hw
);
2729 struct iwl4965_priv
*priv
= hw
->priv
;
2730 struct iwl4965_lq_sta
*lq_sta
;
2731 struct sta_info
*sta
;
2733 u32 samples
= 0, success
= 0, good
= 0;
2734 unsigned long now
= jiffies
;
2736 u8 lq_type
, antenna
;
2740 sta
= sta_info_get(local
, priv
->stations
[sta_id
].sta
.sta
.addr
);
2741 if (!sta
|| !sta
->rate_ctrl_priv
) {
2743 IWL_DEBUG_RATE("leave - no private rate data!\n");
2745 IWL_DEBUG_RATE("leave - no station!\n");
2747 return sprintf(buf
, "station %d not found\n", sta_id
);
2750 lq_sta
= (void *)sta
->rate_ctrl_priv
;
2752 lq_type
= lq_sta
->lq_info
[lq_sta
->active_tbl
].lq_type
;
2753 antenna
= lq_sta
->lq_info
[lq_sta
->active_tbl
].antenna_type
;
2755 if (is_legacy(lq_type
))
2756 i
= IWL_RATE_54M_INDEX
;
2758 i
= IWL_RATE_60M_INDEX
;
2762 int active
= lq_sta
->active_tbl
;
2765 sprintf(&buf
[cnt
], " %2dMbs: ", iwl4965_rates
[i
].ieee
/ 2);
2767 mask
= (1ULL << (IWL_RATE_MAX_WINDOW
- 1));
2768 for (j
= 0; j
< IWL_RATE_MAX_WINDOW
; j
++, mask
>>= 1)
2770 (lq_sta
->lq_info
[active
].win
[i
].data
& mask
)
2773 samples
+= lq_sta
->lq_info
[active
].win
[i
].counter
;
2774 good
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
;
2775 success
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
*
2776 iwl4965_rates
[i
].ieee
;
2778 if (lq_sta
->lq_info
[active
].win
[i
].stamp
) {
2780 jiffies_to_msecs(now
-
2781 lq_sta
->lq_info
[active
].win
[i
].stamp
);
2783 if (delta
> max_time
)
2786 cnt
+= sprintf(&buf
[cnt
], "%5dms\n", delta
);
2790 j
= iwl4965_get_prev_ieee_rate(i
);
2796 /* Display the average rate of all samples taken.
2798 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2799 * added from iwl4965_rates is actually 2X the rate */
2801 cnt
+= sprintf(&buf
[cnt
],
2802 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2803 "%3d%% success (%d good packets over %d tries)\n",
2804 success
/ (2 * samples
), (success
* 5 / samples
) % 10,
2805 max_time
, good
* 100 / samples
, good
, samples
);
2807 cnt
+= sprintf(&buf
[cnt
], "\nAverage rate: 0Mbs\n");
2809 cnt
+= sprintf(&buf
[cnt
], "\nrate scale type %d antenna %d "
2810 "active_search %d rate index %d\n", lq_type
, antenna
,
2811 lq_sta
->search_better_tbl
, sta
->last_txrate_idx
);
2817 void iwl4965_rate_scale_init(struct ieee80211_hw
*hw
, s32 sta_id
)
2819 struct iwl4965_priv
*priv
= hw
->priv
;
2821 priv
->lq_mngr
.lq_ready
= 1;
2824 void iwl4965_rate_control_register(struct ieee80211_hw
*hw
)
2826 ieee80211_rate_control_register(&rs_ops
);
2829 void iwl4965_rate_control_unregister(struct ieee80211_hw
*hw
)
2831 ieee80211_rate_control_unregister(&rs_ops
);