1 /******************************************************************************
3 * Copyright(c) 2005 - 2007 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 iwl_rate_scale_priv,
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 */
102 * struct iwl_rate_scale_priv -- driver's rate scaling private structure
104 * Pointer to this gets passed back and forth between driver and mac80211.
106 struct iwl4965_lq_sta
{
107 u8 active_tbl
; /* index of active table, range 0-1 */
108 u8 enable_counter
; /* indicates HT mode */
109 u8 stay_in_tbl
; /* 1: disallow, 0: allow search for new mode */
110 u8 search_better_tbl
; /* 1: currently trying alternate mode */
113 /* The following determine when to search for a new mode */
114 u32 table_count_limit
;
115 u32 max_failure_limit
; /* # failed frames before new search */
116 u32 max_success_limit
; /* # successful frames before new search */
118 u32 total_failed
; /* total failed frames, any/all rates */
119 u32 total_success
; /* total successful frames, any/all rates */
120 u32 flush_timer
; /* time staying in mode before new search */
122 u8 action_counter
; /* # mode-switch actions tried */
130 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
133 u16 active_siso_rate
;
134 u16 active_mimo_rate
;
135 u16 active_rate_basic
;
137 struct iwl4965_link_quality_cmd lq
;
138 struct iwl4965_scale_tbl_info lq_info
[LQ_SIZE
]; /* "active", "search" */
139 #ifdef CONFIG_MAC80211_DEBUGFS
140 struct dentry
*rs_sta_dbgfs_scale_table_file
;
141 struct dentry
*rs_sta_dbgfs_stats_table_file
;
142 struct iwl4965_rate dbg_fixed
;
143 struct iwl4965_priv
*drv
;
147 static void rs_rate_scale_perform(struct iwl4965_priv
*priv
,
148 struct net_device
*dev
,
149 struct ieee80211_hdr
*hdr
,
150 struct sta_info
*sta
);
151 static void rs_fill_link_cmd(struct iwl4965_lq_sta
*lq_sta
,
152 struct iwl4965_rate
*tx_mcs
,
153 struct iwl4965_link_quality_cmd
*tbl
);
156 #ifdef CONFIG_MAC80211_DEBUGFS
157 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
158 struct iwl4965_rate
*mcs
, int index
);
160 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
161 struct iwl4965_rate
*mcs
, int index
)
166 * Expected throughput metrics for following rates:
167 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
168 * "G" is the only table that supports CCK (the first 4 rates).
170 static s32 expected_tpt_A
[IWL_RATE_COUNT
] = {
171 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
174 static s32 expected_tpt_G
[IWL_RATE_COUNT
] = {
175 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
178 static s32 expected_tpt_siso20MHz
[IWL_RATE_COUNT
] = {
179 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
182 static s32 expected_tpt_siso20MHzSGI
[IWL_RATE_COUNT
] = {
183 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
186 static s32 expected_tpt_mimo20MHz
[IWL_RATE_COUNT
] = {
187 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
190 static s32 expected_tpt_mimo20MHzSGI
[IWL_RATE_COUNT
] = {
191 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
194 static s32 expected_tpt_siso40MHz
[IWL_RATE_COUNT
] = {
195 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
198 static s32 expected_tpt_siso40MHzSGI
[IWL_RATE_COUNT
] = {
199 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
202 static s32 expected_tpt_mimo40MHz
[IWL_RATE_COUNT
] = {
203 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
206 static s32 expected_tpt_mimo40MHzSGI
[IWL_RATE_COUNT
] = {
207 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
210 static int iwl4965_lq_sync_callback(struct iwl4965_priv
*priv
,
211 struct iwl4965_cmd
*cmd
, struct sk_buff
*skb
)
213 /*We didn't cache the SKB; let the caller free it */
217 static inline u8
iwl4965_rate_get_rate(u32 rate_n_flags
)
219 return (u8
)(rate_n_flags
& 0xFF);
222 static int rs_send_lq_cmd(struct iwl4965_priv
*priv
,
223 struct iwl4965_link_quality_cmd
*lq
, u8 flags
)
225 #ifdef CONFIG_IWL4965_DEBUG
228 struct iwl4965_host_cmd cmd
= {
229 .id
= REPLY_TX_LINK_QUALITY_CMD
,
230 .len
= sizeof(struct iwl4965_link_quality_cmd
),
235 if ((lq
->sta_id
== 0xFF) &&
236 (priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
))
239 if (lq
->sta_id
== 0xFF)
240 lq
->sta_id
= IWL_AP_ID
;
242 IWL_DEBUG_RATE("lq station id 0x%x\n", lq
->sta_id
);
243 IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
244 lq
->general_params
.single_stream_ant_msk
,
245 lq
->general_params
.dual_stream_ant_msk
);
246 #ifdef CONFIG_IWL4965_DEBUG
247 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
248 IWL_DEBUG_RATE("lq index %d 0x%X\n",
249 i
, lq
->rs_table
[i
].rate_n_flags
);
252 if (flags
& CMD_ASYNC
)
253 cmd
.meta
.u
.callback
= iwl4965_lq_sync_callback
;
255 if (iwl4965_is_associated(priv
) && priv
->assoc_station_added
&&
256 priv
->lq_mngr
.lq_ready
)
257 return iwl4965_send_cmd(priv
, &cmd
);
262 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data
*window
)
265 window
->success_counter
= 0;
266 window
->success_ratio
= IWL_INVALID_VALUE
;
268 window
->average_tpt
= IWL_INVALID_VALUE
;
273 * rs_collect_tx_data - Update the success/failure sliding window
275 * We keep a sliding window of the last 62 packets transmitted
276 * at this rate. window->data contains the bitmask of successful
279 static int rs_collect_tx_data(struct iwl4965_rate_scale_data
*windows
,
280 int scale_index
, s32 tpt
, int retries
,
283 struct iwl4965_rate_scale_data
*window
= NULL
;
285 u8 win_size
= IWL_RATE_MAX_WINDOW
;
288 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
291 /* Select data for current tx bit rate */
292 window
= &(windows
[scale_index
]);
295 * Keep track of only the latest 62 tx frame attempts in this rate's
296 * history window; anything older isn't really relevant any more.
297 * If we have filled up the sliding window, drop the oldest attempt;
298 * if the oldest attempt (highest bit in bitmap) shows "success",
299 * subtract "1" from the success counter (this is the main reason
300 * we keep these bitmaps!).
302 while (retries
> 0) {
303 if (window
->counter
>= win_size
) {
304 window
->counter
= win_size
- 1;
306 mask
= (mask
<< (win_size
- 1));
307 if (window
->data
& mask
) {
308 window
->data
&= ~mask
;
309 window
->success_counter
=
310 window
->success_counter
- 1;
314 /* Increment frames-attempted counter */
317 /* Shift bitmap by one frame (throw away oldest history),
318 * OR in "1", and increment "success" if this
319 * frame was successful. */
321 window
->data
= (mask
<< 1);
323 window
->success_counter
= window
->success_counter
+ 1;
331 /* Calculate current success ratio, avoid divide-by-0! */
332 if (window
->counter
> 0)
333 window
->success_ratio
= 128 * (100 * window
->success_counter
)
336 window
->success_ratio
= IWL_INVALID_VALUE
;
338 fail_count
= window
->counter
- window
->success_counter
;
340 /* Calculate average throughput, if we have enough history. */
341 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
342 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
343 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
345 window
->average_tpt
= IWL_INVALID_VALUE
;
347 /* Tag this window as having been updated */
348 window
->stamp
= jiffies
;
354 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
356 static void rs_mcs_from_tbl(struct iwl4965_rate
*mcs_rate
,
357 struct iwl4965_scale_tbl_info
*tbl
,
358 int index
, u8 use_green
)
360 if (is_legacy(tbl
->lq_type
)) {
361 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp
;
362 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
363 mcs_rate
->rate_n_flags
|= RATE_MCS_CCK_MSK
;
365 } else if (is_siso(tbl
->lq_type
)) {
366 if (index
> IWL_LAST_OFDM_RATE
)
367 index
= IWL_LAST_OFDM_RATE
;
368 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp_siso
|
371 if (index
> IWL_LAST_OFDM_RATE
)
372 index
= IWL_LAST_OFDM_RATE
;
373 mcs_rate
->rate_n_flags
= iwl4965_rates
[index
].plcp_mimo
|
377 switch (tbl
->antenna_type
) {
379 mcs_rate
->rate_n_flags
|= RATE_MCS_ANT_AB_MSK
;
382 mcs_rate
->rate_n_flags
|= RATE_MCS_ANT_A_MSK
;
385 mcs_rate
->rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
391 if (is_legacy(tbl
->lq_type
))
396 mcs_rate
->rate_n_flags
|= RATE_MCS_DUP_MSK
;
398 mcs_rate
->rate_n_flags
|= RATE_MCS_FAT_MSK
;
401 mcs_rate
->rate_n_flags
|= RATE_MCS_SGI_MSK
;
404 mcs_rate
->rate_n_flags
|= RATE_MCS_GF_MSK
;
405 if (is_siso(tbl
->lq_type
))
406 mcs_rate
->rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
411 * Interpret uCode API's rate_n_flags format,
412 * fill "search" or "active" tx mode table.
414 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate
*mcs_rate
,
415 int phymode
, struct iwl4965_scale_tbl_info
*tbl
,
421 index
= iwl4965_rate_index_from_plcp(mcs_rate
->rate_n_flags
);
423 if (index
== IWL_RATE_INVALID
) {
427 tbl
->is_SGI
= 0; /* default legacy setup */
430 tbl
->antenna_type
= ANT_BOTH
; /* default MIMO setup */
432 /* legacy rate format */
433 if (!(mcs_rate
->rate_n_flags
& RATE_MCS_HT_MSK
)) {
434 ant_msk
= (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_AB_MSK
);
436 if (ant_msk
== RATE_MCS_ANT_AB_MSK
)
437 tbl
->lq_type
= LQ_NONE
;
440 if (phymode
== MODE_IEEE80211A
)
445 if (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_A_MSK
)
446 tbl
->antenna_type
= ANT_MAIN
;
448 tbl
->antenna_type
= ANT_AUX
;
452 /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
453 } else if (iwl4965_rate_get_rate(mcs_rate
->rate_n_flags
)
454 <= IWL_RATE_SISO_60M_PLCP
) {
455 tbl
->lq_type
= LQ_SISO
;
457 ant_msk
= (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_AB_MSK
);
458 if (ant_msk
== RATE_MCS_ANT_AB_MSK
)
459 tbl
->lq_type
= LQ_NONE
;
461 if (mcs_rate
->rate_n_flags
& RATE_MCS_ANT_A_MSK
)
462 tbl
->antenna_type
= ANT_MAIN
;
464 tbl
->antenna_type
= ANT_AUX
;
466 if (mcs_rate
->rate_n_flags
& RATE_MCS_SGI_MSK
)
469 if ((mcs_rate
->rate_n_flags
& RATE_MCS_FAT_MSK
) ||
470 (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
))
473 if (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
)
478 /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
480 tbl
->lq_type
= LQ_MIMO
;
481 if (mcs_rate
->rate_n_flags
& RATE_MCS_SGI_MSK
)
484 if ((mcs_rate
->rate_n_flags
& RATE_MCS_FAT_MSK
) ||
485 (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
))
488 if (mcs_rate
->rate_n_flags
& RATE_MCS_DUP_MSK
)
495 static inline void rs_toggle_antenna(struct iwl4965_rate
*new_rate
,
496 struct iwl4965_scale_tbl_info
*tbl
)
498 if (tbl
->antenna_type
== ANT_AUX
) {
499 tbl
->antenna_type
= ANT_MAIN
;
500 new_rate
->rate_n_flags
&= ~RATE_MCS_ANT_B_MSK
;
501 new_rate
->rate_n_flags
|= RATE_MCS_ANT_A_MSK
;
503 tbl
->antenna_type
= ANT_AUX
;
504 new_rate
->rate_n_flags
&= ~RATE_MCS_ANT_A_MSK
;
505 new_rate
->rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
509 static inline u8
rs_use_green(struct iwl4965_priv
*priv
,
510 struct ieee80211_conf
*conf
)
512 #ifdef CONFIG_IWL4965_HT
513 return ((conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) &&
514 priv
->current_ht_config
.is_green_field
&&
515 !priv
->current_ht_config
.non_GF_STA_present
);
516 #endif /* CONFIG_IWL4965_HT */
521 * rs_get_supported_rates - get the available rates
523 * if management frame or broadcast frame only return
524 * basic available rates.
527 static void rs_get_supported_rates(struct iwl4965_lq_sta
*lq_sta
,
528 struct ieee80211_hdr
*hdr
,
529 enum iwl4965_table_type rate_type
,
532 if (is_legacy(rate_type
))
533 *data_rate
= lq_sta
->active_rate
;
535 if (is_siso(rate_type
))
536 *data_rate
= lq_sta
->active_siso_rate
;
538 *data_rate
= lq_sta
->active_mimo_rate
;
541 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
542 lq_sta
->active_rate_basic
) {
543 *data_rate
= lq_sta
->active_rate_basic
;
547 static u16
rs_get_adjacent_rate(u8 index
, u16 rate_mask
, int rate_type
)
549 u8 high
= IWL_RATE_INVALID
;
550 u8 low
= IWL_RATE_INVALID
;
552 /* 802.11A or ht walks to the next literal adjacent rate in
554 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
558 /* Find the previous rate that is in the rate mask */
560 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
561 if (rate_mask
& mask
) {
567 /* Find the next rate that is in the rate mask */
569 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
570 if (rate_mask
& mask
) {
576 return (high
<< 8) | low
;
580 while (low
!= IWL_RATE_INVALID
) {
581 low
= iwl4965_rates
[low
].prev_rs
;
582 if (low
== IWL_RATE_INVALID
)
584 if (rate_mask
& (1 << low
))
586 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low
);
590 while (high
!= IWL_RATE_INVALID
) {
591 high
= iwl4965_rates
[high
].next_rs
;
592 if (high
== IWL_RATE_INVALID
)
594 if (rate_mask
& (1 << high
))
596 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high
);
599 return (high
<< 8) | low
;
602 static void rs_get_lower_rate(struct iwl4965_lq_sta
*lq_sta
,
603 struct iwl4965_scale_tbl_info
*tbl
, u8 scale_index
,
604 u8 ht_possible
, struct iwl4965_rate
*mcs_rate
)
609 u8 switch_to_legacy
= 0;
610 u8 is_green
= lq_sta
->is_green
;
612 /* check if we need to switch from HT to legacy rates.
613 * assumption is that mandatory rates (1Mbps or 6Mbps)
614 * are always supported (spec demand) */
615 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
616 switch_to_legacy
= 1;
617 scale_index
= rs_ht_to_legacy
[scale_index
];
618 if (lq_sta
->phymode
== MODE_IEEE80211A
)
623 if ((tbl
->antenna_type
== ANT_BOTH
) ||
624 (tbl
->antenna_type
== ANT_NONE
))
625 tbl
->antenna_type
= ANT_MAIN
;
631 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
, &rate_mask
);
633 /* Mask with station rate restriction */
634 if (is_legacy(tbl
->lq_type
)) {
635 /* supp_rates has no CCK bits in A mode */
636 if (lq_sta
->phymode
== (u8
) MODE_IEEE80211A
)
637 rate_mask
= (u16
)(rate_mask
&
638 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
640 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
643 /* If we switched from HT to legacy, check current rate */
644 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
645 rs_mcs_from_tbl(mcs_rate
, tbl
, scale_index
, is_green
);
649 high_low
= rs_get_adjacent_rate(scale_index
, rate_mask
, tbl
->lq_type
);
650 low
= high_low
& 0xff;
652 if (low
!= IWL_RATE_INVALID
)
653 rs_mcs_from_tbl(mcs_rate
, tbl
, low
, is_green
);
655 rs_mcs_from_tbl(mcs_rate
, tbl
, scale_index
, is_green
);
659 * mac80211 sends us Tx status
661 static void rs_tx_status(void *priv_rate
, struct net_device
*dev
,
663 struct ieee80211_tx_status
*tx_resp
)
667 int rs_index
, index
= 0;
668 struct iwl4965_lq_sta
*lq_sta
;
669 struct iwl4965_link_quality_cmd
*table
;
670 struct sta_info
*sta
;
671 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
672 struct iwl4965_priv
*priv
= (struct iwl4965_priv
*)priv_rate
;
673 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
674 struct iwl4965_rate_scale_data
*window
= NULL
;
675 struct iwl4965_rate_scale_data
*search_win
= NULL
;
676 struct iwl4965_rate tx_mcs
;
677 struct iwl4965_scale_tbl_info tbl_type
;
678 struct iwl4965_scale_tbl_info
*curr_tbl
, *search_tbl
;
680 u16 fc
= le16_to_cpu(hdr
->frame_control
);
683 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
685 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
))
688 /* This packet was aggregated but doesn't carry rate scale info */
689 if ((tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
) &&
690 !(tx_resp
->flags
& IEEE80211_TX_STATUS_AMPDU
))
693 retries
= tx_resp
->retry_count
;
699 sta
= sta_info_get(local
, hdr
->addr1
);
701 if (!sta
|| !sta
->rate_ctrl_priv
) {
707 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
709 if (!priv
->lq_mngr
.lq_ready
)
712 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
713 !lq_sta
->ibss_sta_added
)
717 active_index
= lq_sta
->active_tbl
;
719 /* Get mac80211 antenna info */
721 (lq_sta
->valid_antenna
& local
->hw
.conf
.antenna_sel_tx
);
722 if (!lq_sta
->antenna
)
723 lq_sta
->antenna
= lq_sta
->valid_antenna
;
725 /* Ignore mac80211 antenna info for now */
726 lq_sta
->antenna
= lq_sta
->valid_antenna
;
728 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
729 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
730 window
= (struct iwl4965_rate_scale_data
*)
732 search_win
= (struct iwl4965_rate_scale_data
*)
733 &(search_tbl
->win
[0]);
735 tx_mcs
.rate_n_flags
= tx_resp
->control
.tx_rate
;
737 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->phymode
,
738 &tbl_type
, &rs_index
);
739 if ((rs_index
< 0) || (rs_index
>= IWL_RATE_COUNT
)) {
740 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
741 rs_index
, tx_mcs
.rate_n_flags
);
747 * Ignore this Tx frame response if its initial rate doesn't match
748 * that of latest Link Quality command. There may be stragglers
749 * from a previous Link Quality command, but we're no longer interested
750 * in those; they're either from the "active" mode while we're trying
751 * to check "search" mode, or a prior "search" mode after we've moved
752 * to a new "search" mode (which might become the new "active" mode).
755 (tx_mcs
.rate_n_flags
!=
756 le32_to_cpu(table
->rs_table
[0].rate_n_flags
))) {
757 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
759 le32_to_cpu(table
->rs_table
[0].rate_n_flags
));
764 /* Update frame history window with "failure" for each Tx retry. */
766 /* Look up the rate and other info used for each tx attempt.
767 * Each tx attempt steps one entry deeper in the rate table. */
768 tx_mcs
.rate_n_flags
=
769 le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
770 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->phymode
,
771 &tbl_type
, &rs_index
);
773 /* If type matches "search" table,
774 * add failure to "search" history */
775 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
776 (tbl_type
.antenna_type
== search_tbl
->antenna_type
) &&
777 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
778 if (search_tbl
->expected_tpt
)
779 tpt
= search_tbl
->expected_tpt
[rs_index
];
782 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
784 /* Else if type matches "current/active" table,
785 * add failure to "current/active" history */
786 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
787 (tbl_type
.antenna_type
== curr_tbl
->antenna_type
) &&
788 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
789 if (curr_tbl
->expected_tpt
)
790 tpt
= curr_tbl
->expected_tpt
[rs_index
];
793 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
796 /* If not searching for a new mode, increment failed counter
797 * ... this helps determine when to start searching again */
798 if (lq_sta
->stay_in_tbl
)
799 lq_sta
->total_failed
++;
806 * Find (by rate) the history window to update with final Tx attempt;
807 * if Tx was successful first try, use original rate,
808 * else look up the rate that was, finally, successful.
810 if (!tx_resp
->retry_count
)
811 tx_mcs
.rate_n_flags
= tx_resp
->control
.tx_rate
;
813 tx_mcs
.rate_n_flags
=
814 le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
816 rs_get_tbl_info_from_mcs(&tx_mcs
, priv
->phymode
,
817 &tbl_type
, &rs_index
);
819 /* Update frame history window with "success" if Tx got ACKed ... */
820 if (tx_resp
->flags
& IEEE80211_TX_STATUS_ACK
)
825 /* If type matches "search" table,
826 * add final tx status to "search" history */
827 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
828 (tbl_type
.antenna_type
== search_tbl
->antenna_type
) &&
829 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
830 if (search_tbl
->expected_tpt
)
831 tpt
= search_tbl
->expected_tpt
[rs_index
];
834 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
)
835 rs_collect_tx_data(search_win
, rs_index
, tpt
,
836 tx_resp
->ampdu_ack_len
,
837 tx_resp
->ampdu_ack_map
);
839 rs_collect_tx_data(search_win
, rs_index
, tpt
,
841 /* Else if type matches "current/active" table,
842 * add final tx status to "current/active" history */
843 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
844 (tbl_type
.antenna_type
== curr_tbl
->antenna_type
) &&
845 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
846 if (curr_tbl
->expected_tpt
)
847 tpt
= curr_tbl
->expected_tpt
[rs_index
];
850 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
)
851 rs_collect_tx_data(window
, rs_index
, tpt
,
852 tx_resp
->ampdu_ack_len
,
853 tx_resp
->ampdu_ack_map
);
855 rs_collect_tx_data(window
, rs_index
, tpt
,
859 /* If not searching for new mode, increment success/failed counter
860 * ... these help determine when to start searching again */
861 if (lq_sta
->stay_in_tbl
) {
862 if (tx_resp
->control
.flags
& IEEE80211_TXCTL_AMPDU
) {
863 lq_sta
->total_success
+= tx_resp
->ampdu_ack_map
;
864 lq_sta
->total_failed
+=
865 (tx_resp
->ampdu_ack_len
- tx_resp
->ampdu_ack_map
);
868 lq_sta
->total_success
++;
870 lq_sta
->total_failed
++;
874 /* See if there's a better rate or modulation mode to try. */
875 rs_rate_scale_perform(priv
, dev
, hdr
, sta
);
880 static u8
rs_is_ant_connected(u8 valid_antenna
,
881 enum iwl4965_antenna_type antenna_type
)
883 if (antenna_type
== ANT_AUX
)
884 return ((valid_antenna
& 0x2) ? 1:0);
885 else if (antenna_type
== ANT_MAIN
)
886 return ((valid_antenna
& 0x1) ? 1:0);
887 else if (antenna_type
== ANT_BOTH
)
888 return ((valid_antenna
& 0x3) == 0x3);
893 static u8
rs_is_other_ant_connected(u8 valid_antenna
,
894 enum iwl4965_antenna_type antenna_type
)
896 if (antenna_type
== ANT_AUX
)
897 return rs_is_ant_connected(valid_antenna
, ANT_MAIN
);
899 return rs_is_ant_connected(valid_antenna
, ANT_AUX
);
905 * Begin a period of staying with a selected modulation mode.
906 * Set "stay_in_tbl" flag to prevent any mode switches.
907 * Set frame tx success limits according to legacy vs. high-throughput,
908 * and reset overall (spanning all rates) tx success history statistics.
909 * These control how long we stay using same modulation mode before
910 * searching for a new mode.
912 static void rs_set_stay_in_table(u8 is_legacy
,
913 struct iwl4965_lq_sta
*lq_sta
)
915 IWL_DEBUG_HT("we are staying in the same table\n");
916 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
918 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
919 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
920 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
922 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
923 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
924 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
926 lq_sta
->table_count
= 0;
927 lq_sta
->total_failed
= 0;
928 lq_sta
->total_success
= 0;
932 * Find correct throughput table for given mode of modulation
934 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta
*lq_sta
,
935 struct iwl4965_scale_tbl_info
*tbl
)
937 if (is_legacy(tbl
->lq_type
)) {
938 if (!is_a_band(tbl
->lq_type
))
939 tbl
->expected_tpt
= expected_tpt_G
;
941 tbl
->expected_tpt
= expected_tpt_A
;
942 } else if (is_siso(tbl
->lq_type
)) {
943 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
945 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
947 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
948 else if (tbl
->is_SGI
)
949 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
951 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
953 } else if (is_mimo(tbl
->lq_type
)) {
954 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
956 tbl
->expected_tpt
= expected_tpt_mimo40MHzSGI
;
958 tbl
->expected_tpt
= expected_tpt_mimo40MHz
;
959 else if (tbl
->is_SGI
)
960 tbl
->expected_tpt
= expected_tpt_mimo20MHzSGI
;
962 tbl
->expected_tpt
= expected_tpt_mimo20MHz
;
964 tbl
->expected_tpt
= expected_tpt_G
;
967 #ifdef CONFIG_IWL4965_HT
969 * Find starting rate for new "search" high-throughput mode of modulation.
970 * Goal is to find lowest expected rate (under perfect conditions) that is
971 * above the current measured throughput of "active" mode, to give new mode
972 * a fair chance to prove itself without too many challenges.
974 * This gets called when transitioning to more aggressive modulation
975 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
976 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
977 * to decrease to match "active" throughput. When moving from MIMO to SISO,
978 * bit rate will typically need to increase, but not if performance was bad.
980 static s32
rs_get_best_rate(struct iwl4965_priv
*priv
,
981 struct iwl4965_lq_sta
*lq_sta
,
982 struct iwl4965_scale_tbl_info
*tbl
, /* "search" */
983 u16 rate_mask
, s8 index
, s8 rate
)
985 /* "active" values */
986 struct iwl4965_scale_tbl_info
*active_tbl
=
987 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
988 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
989 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
991 /* expected "search" throughput */
992 s32
*tpt_tbl
= tbl
->expected_tpt
;
994 s32 new_rate
, high
, low
, start_hi
;
997 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1000 high_low
= rs_get_adjacent_rate(rate
, rate_mask
, tbl
->lq_type
);
1002 low
= high_low
& 0xff;
1003 high
= (high_low
>> 8) & 0xff;
1006 * Lower the "search" bit rate, to give new "search" mode
1007 * approximately the same throughput as "active" if:
1009 * 1) "Active" mode has been working modestly well (but not
1010 * great), and expected "search" throughput (under perfect
1011 * conditions) at candidate rate is above the actual
1012 * measured "active" throughput (but less than expected
1013 * "active" throughput under perfect conditions).
1015 * 2) "Active" mode has been working perfectly or very well
1016 * and expected "search" throughput (under perfect
1017 * conditions) at candidate rate is above expected
1018 * "active" throughput (under perfect conditions).
1020 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1021 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1022 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1023 (tpt_tbl
[rate
] <= active_tpt
))) ||
1024 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1025 (tpt_tbl
[rate
] > active_tpt
))) {
1027 /* (2nd or later pass)
1028 * If we've already tried to raise the rate, and are
1029 * now trying to lower it, use the higher rate. */
1030 if (start_hi
!= IWL_RATE_INVALID
) {
1031 new_rate
= start_hi
;
1037 /* Loop again with lower rate */
1038 if (low
!= IWL_RATE_INVALID
)
1041 /* Lower rate not available, use the original */
1045 /* Else try to raise the "search" rate to match "active" */
1047 /* (2nd or later pass)
1048 * If we've already tried to lower the rate, and are
1049 * now trying to raise it, use the lower rate. */
1050 if (new_rate
!= IWL_RATE_INVALID
)
1053 /* Loop again with higher rate */
1054 else if (high
!= IWL_RATE_INVALID
) {
1058 /* Higher rate not available, use the original */
1068 #endif /* CONFIG_IWL4965_HT */
1070 static inline u8
rs_is_both_ant_supp(u8 valid_antenna
)
1072 return (rs_is_ant_connected(valid_antenna
, ANT_BOTH
));
1076 * Set up search table for MIMO
1078 static int rs_switch_to_mimo(struct iwl4965_priv
*priv
,
1079 struct iwl4965_lq_sta
*lq_sta
,
1080 struct ieee80211_conf
*conf
,
1081 struct sta_info
*sta
,
1082 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1084 #ifdef CONFIG_IWL4965_HT
1087 s8 is_green
= lq_sta
->is_green
;
1089 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1090 !sta
->ht_info
.ht_supported
)
1093 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1094 tbl
->lq_type
= LQ_MIMO
;
1095 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
,
1098 if (priv
->current_ht_config
.tx_mimo_ps_mode
== IWL_MIMO_PS_STATIC
)
1101 /* Need both Tx chains/antennas to support MIMO */
1102 if (!rs_is_both_ant_supp(lq_sta
->antenna
))
1105 tbl
->is_dup
= lq_sta
->is_dup
;
1107 if (priv
->current_ht_config
.supported_chan_width
1108 == IWL_CHANNEL_WIDTH_40MHZ
)
1114 if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_40MHZ_ONLY
)
1118 } else if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_20MHZ_ONLY
)
1123 rs_get_expected_tpt_table(lq_sta
, tbl
);
1125 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
, index
);
1127 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate
, rate_mask
);
1128 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
))
1130 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, rate
, is_green
);
1132 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1133 tbl
->current_rate
.rate_n_flags
, is_green
);
1137 #endif /*CONFIG_IWL4965_HT */
1141 * Set up search table for SISO
1143 static int rs_switch_to_siso(struct iwl4965_priv
*priv
,
1144 struct iwl4965_lq_sta
*lq_sta
,
1145 struct ieee80211_conf
*conf
,
1146 struct sta_info
*sta
,
1147 struct iwl4965_scale_tbl_info
*tbl
, int index
)
1149 #ifdef CONFIG_IWL4965_HT
1151 u8 is_green
= lq_sta
->is_green
;
1154 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1155 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1156 !sta
->ht_info
.ht_supported
)
1159 tbl
->is_dup
= lq_sta
->is_dup
;
1160 tbl
->lq_type
= LQ_SISO
;
1162 rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
,
1165 if (priv
->current_ht_config
.supported_chan_width
1166 == IWL_CHANNEL_WIDTH_40MHZ
)
1172 if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_40MHZ_ONLY
)
1176 } else if (priv
->current_ht_config
.sgf
& HT_SHORT_GI_20MHZ_ONLY
)
1184 rs_get_expected_tpt_table(lq_sta
, tbl
);
1185 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
, index
);
1187 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1188 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1189 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1193 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, rate
, is_green
);
1194 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1195 tbl
->current_rate
.rate_n_flags
, is_green
);
1200 #endif /*CONFIG_IWL4965_HT */
1204 * Try to switch to new modulation mode from legacy
1206 static int rs_move_legacy_other(struct iwl4965_priv
*priv
,
1207 struct iwl4965_lq_sta
*lq_sta
,
1208 struct ieee80211_conf
*conf
,
1209 struct sta_info
*sta
,
1213 struct iwl4965_scale_tbl_info
*tbl
=
1214 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1215 struct iwl4965_scale_tbl_info
*search_tbl
=
1216 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1217 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1218 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1219 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1220 u8 start_action
= tbl
->action
;
1223 switch (tbl
->action
) {
1224 case IWL_LEGACY_SWITCH_ANTENNA
:
1225 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1227 search_tbl
->lq_type
= LQ_NONE
;
1228 lq_sta
->action_counter
++;
1230 /* Don't change antenna if success has been great */
1231 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1234 /* Don't change antenna if other one is not connected */
1235 if (!rs_is_other_ant_connected(lq_sta
->antenna
,
1239 /* Set up search table to try other antenna */
1240 memcpy(search_tbl
, tbl
, sz
);
1242 rs_toggle_antenna(&(search_tbl
->current_rate
),
1244 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1245 lq_sta
->search_better_tbl
= 1;
1248 case IWL_LEGACY_SWITCH_SISO
:
1249 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1251 /* Set up search table to try SISO */
1252 memcpy(search_tbl
, tbl
, sz
);
1253 search_tbl
->lq_type
= LQ_SISO
;
1254 search_tbl
->is_SGI
= 0;
1255 search_tbl
->is_fat
= 0;
1256 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1259 lq_sta
->search_better_tbl
= 1;
1260 lq_sta
->action_counter
= 0;
1265 case IWL_LEGACY_SWITCH_MIMO
:
1266 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1268 /* Set up search table to try MIMO */
1269 memcpy(search_tbl
, tbl
, sz
);
1270 search_tbl
->lq_type
= LQ_MIMO
;
1271 search_tbl
->is_SGI
= 0;
1272 search_tbl
->is_fat
= 0;
1273 search_tbl
->antenna_type
= ANT_BOTH
;
1274 ret
= rs_switch_to_mimo(priv
, lq_sta
, conf
, sta
,
1277 lq_sta
->search_better_tbl
= 1;
1278 lq_sta
->action_counter
= 0;
1284 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO
)
1285 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1287 if (tbl
->action
== start_action
)
1295 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO
)
1296 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1302 * Try to switch to new modulation mode from SISO
1304 static int rs_move_siso_to_other(struct iwl4965_priv
*priv
,
1305 struct iwl4965_lq_sta
*lq_sta
,
1306 struct ieee80211_conf
*conf
,
1307 struct sta_info
*sta
,
1311 u8 is_green
= lq_sta
->is_green
;
1312 struct iwl4965_scale_tbl_info
*tbl
=
1313 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1314 struct iwl4965_scale_tbl_info
*search_tbl
=
1315 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1316 struct iwl4965_rate_scale_data
*window
= &(tbl
->win
[index
]);
1317 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1318 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1319 u8 start_action
= tbl
->action
;
1322 lq_sta
->action_counter
++;
1323 switch (tbl
->action
) {
1324 case IWL_SISO_SWITCH_ANTENNA
:
1325 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1326 search_tbl
->lq_type
= LQ_NONE
;
1327 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1329 if (!rs_is_other_ant_connected(lq_sta
->antenna
,
1333 memcpy(search_tbl
, tbl
, sz
);
1334 search_tbl
->action
= IWL_SISO_SWITCH_MIMO
;
1335 rs_toggle_antenna(&(search_tbl
->current_rate
),
1337 lq_sta
->search_better_tbl
= 1;
1341 case IWL_SISO_SWITCH_MIMO
:
1342 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1343 memcpy(search_tbl
, tbl
, sz
);
1344 search_tbl
->lq_type
= LQ_MIMO
;
1345 search_tbl
->is_SGI
= 0;
1346 search_tbl
->is_fat
= 0;
1347 search_tbl
->antenna_type
= ANT_BOTH
;
1348 ret
= rs_switch_to_mimo(priv
, lq_sta
, conf
, sta
,
1351 lq_sta
->search_better_tbl
= 1;
1355 case IWL_SISO_SWITCH_GI
:
1356 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1357 memcpy(search_tbl
, tbl
, sz
);
1358 search_tbl
->action
= 0;
1359 if (search_tbl
->is_SGI
)
1360 search_tbl
->is_SGI
= 0;
1362 search_tbl
->is_SGI
= 1;
1365 lq_sta
->search_better_tbl
= 1;
1366 if ((tbl
->lq_type
== LQ_SISO
) &&
1368 s32 tpt
= lq_sta
->last_tpt
/ 100;
1369 if (((!tbl
->is_fat
) &&
1370 (tpt
>= expected_tpt_siso20MHz
[index
])) ||
1372 (tpt
>= expected_tpt_siso40MHz
[index
])))
1373 lq_sta
->search_better_tbl
= 0;
1375 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1376 rs_mcs_from_tbl(&search_tbl
->current_rate
,
1377 search_tbl
, index
, is_green
);
1381 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1382 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1384 if (tbl
->action
== start_action
)
1391 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1392 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1397 * Try to switch to new modulation mode from MIMO
1399 static int rs_move_mimo_to_other(struct iwl4965_priv
*priv
,
1400 struct iwl4965_lq_sta
*lq_sta
,
1401 struct ieee80211_conf
*conf
,
1402 struct sta_info
*sta
,
1406 s8 is_green
= lq_sta
->is_green
;
1407 struct iwl4965_scale_tbl_info
*tbl
=
1408 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1409 struct iwl4965_scale_tbl_info
*search_tbl
=
1410 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1411 u32 sz
= (sizeof(struct iwl4965_scale_tbl_info
) -
1412 (sizeof(struct iwl4965_rate_scale_data
) * IWL_RATE_COUNT
));
1413 u8 start_action
= tbl
->action
;
1416 lq_sta
->action_counter
++;
1417 switch (tbl
->action
) {
1418 case IWL_MIMO_SWITCH_ANTENNA_A
:
1419 case IWL_MIMO_SWITCH_ANTENNA_B
:
1420 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1422 /* Set up new search table for SISO */
1423 memcpy(search_tbl
, tbl
, sz
);
1424 search_tbl
->lq_type
= LQ_SISO
;
1425 search_tbl
->is_SGI
= 0;
1426 search_tbl
->is_fat
= 0;
1427 if (tbl
->action
== IWL_MIMO_SWITCH_ANTENNA_A
)
1428 search_tbl
->antenna_type
= ANT_MAIN
;
1430 search_tbl
->antenna_type
= ANT_AUX
;
1432 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1435 lq_sta
->search_better_tbl
= 1;
1440 case IWL_MIMO_SWITCH_GI
:
1441 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1443 /* Set up new search table for MIMO */
1444 memcpy(search_tbl
, tbl
, sz
);
1445 search_tbl
->lq_type
= LQ_MIMO
;
1446 search_tbl
->antenna_type
= ANT_BOTH
;
1447 search_tbl
->action
= 0;
1448 if (search_tbl
->is_SGI
)
1449 search_tbl
->is_SGI
= 0;
1451 search_tbl
->is_SGI
= 1;
1452 lq_sta
->search_better_tbl
= 1;
1455 * If active table already uses the fastest possible
1456 * modulation (dual stream with short guard interval),
1457 * and it's working well, there's no need to look
1458 * for a better type of modulation!
1460 if ((tbl
->lq_type
== LQ_MIMO
) &&
1462 s32 tpt
= lq_sta
->last_tpt
/ 100;
1463 if (((!tbl
->is_fat
) &&
1464 (tpt
>= expected_tpt_mimo20MHz
[index
])) ||
1466 (tpt
>= expected_tpt_mimo40MHz
[index
])))
1467 lq_sta
->search_better_tbl
= 0;
1469 rs_get_expected_tpt_table(lq_sta
, search_tbl
);
1470 rs_mcs_from_tbl(&search_tbl
->current_rate
,
1471 search_tbl
, index
, is_green
);
1476 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1477 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1479 if (tbl
->action
== start_action
)
1486 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1487 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1493 * Check whether we should continue using same modulation mode, or
1494 * begin search for a new mode, based on:
1495 * 1) # tx successes or failures while using this mode
1496 * 2) # times calling this function
1497 * 3) elapsed time in this mode (not used, for now)
1499 static void rs_stay_in_table(struct iwl4965_lq_sta
*lq_sta
)
1501 struct iwl4965_scale_tbl_info
*tbl
;
1504 int flush_interval_passed
= 0;
1506 active_tbl
= lq_sta
->active_tbl
;
1508 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1510 /* If we've been disallowing search, see if we should now allow it */
1511 if (lq_sta
->stay_in_tbl
) {
1513 /* Elapsed time using current modulation mode */
1514 if (lq_sta
->flush_timer
)
1515 flush_interval_passed
=
1517 (unsigned long)(lq_sta
->flush_timer
+
1518 IWL_RATE_SCALE_FLUSH_INTVL
));
1520 /* For now, disable the elapsed time criterion */
1521 flush_interval_passed
= 0;
1524 * Check if we should allow search for new modulation mode.
1525 * If many frames have failed or succeeded, or we've used
1526 * this same modulation for a long time, allow search, and
1527 * reset history stats that keep track of whether we should
1528 * allow a new search. Also (below) reset all bitmaps and
1529 * stats in active history.
1531 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1532 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1533 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1534 && (flush_interval_passed
))) {
1535 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1536 lq_sta
->total_failed
,
1537 lq_sta
->total_success
,
1538 flush_interval_passed
);
1540 /* Allow search for new mode */
1541 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1542 lq_sta
->total_failed
= 0;
1543 lq_sta
->total_success
= 0;
1544 lq_sta
->flush_timer
= 0;
1547 * Else if we've used this modulation mode enough repetitions
1548 * (regardless of elapsed time or success/failure), reset
1549 * history bitmaps and rate-specific stats for all rates in
1553 lq_sta
->table_count
++;
1554 if (lq_sta
->table_count
>=
1555 lq_sta
->table_count_limit
) {
1556 lq_sta
->table_count
= 0;
1558 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1559 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1560 rs_rate_scale_clear_window(
1565 /* If transitioning to allow "search", reset all history
1566 * bitmaps and stats in active table (this will become the new
1567 * "search" table). */
1568 if (!lq_sta
->stay_in_tbl
) {
1569 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1570 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1576 * Do rate scaling and search for new modulation mode.
1578 static void rs_rate_scale_perform(struct iwl4965_priv
*priv
,
1579 struct net_device
*dev
,
1580 struct ieee80211_hdr
*hdr
,
1581 struct sta_info
*sta
)
1583 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1584 struct ieee80211_hw
*hw
= local_to_hw(local
);
1585 struct ieee80211_conf
*conf
= &hw
->conf
;
1586 int low
= IWL_RATE_INVALID
;
1587 int high
= IWL_RATE_INVALID
;
1590 struct iwl4965_rate_scale_data
*window
= NULL
;
1591 int current_tpt
= IWL_INVALID_VALUE
;
1592 int low_tpt
= IWL_INVALID_VALUE
;
1593 int high_tpt
= IWL_INVALID_VALUE
;
1595 s8 scale_action
= 0;
1598 struct iwl4965_lq_sta
*lq_sta
;
1599 struct iwl4965_scale_tbl_info
*tbl
, *tbl1
;
1600 u16 rate_scale_index_msk
= 0;
1601 struct iwl4965_rate mcs_rate
;
1607 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1609 fc
= le16_to_cpu(hdr
->frame_control
);
1610 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
)) {
1611 /* Send management frames and broadcast/multicast data using
1613 /* TODO: this could probably be improved.. */
1617 if (!sta
|| !sta
->rate_ctrl_priv
)
1620 if (!priv
->lq_mngr
.lq_ready
) {
1621 IWL_DEBUG_RATE("still rate scaling not ready\n");
1624 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
1627 * Select rate-scale / modulation-mode table to work with in
1628 * the rest of this function: "search" if searching for better
1629 * modulation mode, or "active" if doing rate scaling within a mode.
1631 if (!lq_sta
->search_better_tbl
)
1632 active_tbl
= lq_sta
->active_tbl
;
1634 active_tbl
= 1 - lq_sta
->active_tbl
;
1636 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1637 is_green
= lq_sta
->is_green
;
1639 /* current tx rate */
1640 index
= sta
->last_txrate
;
1642 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index
,
1645 /* rates available for this association, and for modulation mode */
1646 rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
,
1649 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask
);
1651 /* mask with station rate restriction */
1652 if (is_legacy(tbl
->lq_type
)) {
1653 if (lq_sta
->phymode
== (u8
) MODE_IEEE80211A
)
1654 /* supp_rates has no CCK bits in A mode */
1655 rate_scale_index_msk
= (u16
) (rate_mask
&
1656 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
1658 rate_scale_index_msk
= (u16
) (rate_mask
&
1659 lq_sta
->supp_rates
);
1662 rate_scale_index_msk
= rate_mask
;
1664 if (!rate_scale_index_msk
)
1665 rate_scale_index_msk
= rate_mask
;
1667 /* If current rate is no longer supported on current association,
1668 * or user changed preferences for rates, find a new supported rate. */
1669 if (index
< 0 || !((1 << index
) & rate_scale_index_msk
)) {
1670 index
= IWL_INVALID_VALUE
;
1673 /* get the highest available rate */
1674 for (i
= 0; i
<= IWL_RATE_COUNT
; i
++) {
1675 if ((1 << i
) & rate_scale_index_msk
)
1679 if (index
== IWL_INVALID_VALUE
) {
1680 IWL_WARNING("Can not find a suitable rate\n");
1685 /* Get expected throughput table and history window for current rate */
1686 if (!tbl
->expected_tpt
)
1687 rs_get_expected_tpt_table(lq_sta
, tbl
);
1689 window
= &(tbl
->win
[index
]);
1692 * If there is not enough history to calculate actual average
1693 * throughput, keep analyzing results of more tx frames, without
1694 * changing rate or mode (bypass most of the rest of this function).
1695 * Set up new rate table in uCode only if old rate is not supported
1696 * in current association (use new rate found above).
1698 fail_count
= window
->counter
- window
->success_counter
;
1699 if (((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
1700 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
))
1701 || (tbl
->expected_tpt
== NULL
)) {
1702 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1704 window
->success_counter
, window
->counter
, index
);
1706 /* Can't calculate this yet; not enough history */
1707 window
->average_tpt
= IWL_INVALID_VALUE
;
1709 /* Should we stay with this modulation mode,
1710 * or search for a new one? */
1711 rs_stay_in_table(lq_sta
);
1713 /* Set up new rate table in uCode, if needed */
1715 rs_mcs_from_tbl(&mcs_rate
, tbl
, index
, is_green
);
1716 rs_fill_link_cmd(lq_sta
, &mcs_rate
, &lq_sta
->lq
);
1717 rs_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1721 /* Else we have enough samples; calculate estimate of
1722 * actual average throughput */
1724 window
->average_tpt
= ((window
->success_ratio
*
1725 tbl
->expected_tpt
[index
] + 64) / 128);
1727 /* If we are searching for better modulation mode, check success. */
1728 if (lq_sta
->search_better_tbl
) {
1729 int success_limit
= IWL_RATE_SCALE_SWITCH
;
1731 /* If good success, continue using the "search" mode;
1732 * no need to send new link quality command, since we're
1733 * continuing to use the setup that we've been trying. */
1734 if ((window
->success_ratio
> success_limit
) ||
1735 (window
->average_tpt
> lq_sta
->last_tpt
)) {
1736 if (!is_legacy(tbl
->lq_type
)) {
1737 IWL_DEBUG_HT("LQ: we are switching to HT"
1738 " rate suc %d current tpt %d"
1740 window
->success_ratio
,
1741 window
->average_tpt
,
1743 lq_sta
->enable_counter
= 1;
1745 /* Swap tables; "search" becomes "active" */
1746 lq_sta
->active_tbl
= active_tbl
;
1747 current_tpt
= window
->average_tpt
;
1749 /* Else poor success; go back to mode in "active" table */
1751 /* Nullify "search" table */
1752 tbl
->lq_type
= LQ_NONE
;
1754 /* Revert to "active" table */
1755 active_tbl
= lq_sta
->active_tbl
;
1756 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1758 /* Revert to "active" rate and throughput info */
1759 index
= iwl4965_rate_index_from_plcp(
1760 tbl
->current_rate
.rate_n_flags
);
1761 current_tpt
= lq_sta
->last_tpt
;
1763 /* Need to set up a new rate table in uCode */
1765 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1768 /* Either way, we've made a decision; modulation mode
1769 * search is done, allow rate adjustment next time. */
1770 lq_sta
->search_better_tbl
= 0;
1771 done_search
= 1; /* Don't switch modes below! */
1775 /* (Else) not in search of better modulation mode, try for better
1776 * starting rate, while staying in this mode. */
1777 high_low
= rs_get_adjacent_rate(index
, rate_scale_index_msk
,
1779 low
= high_low
& 0xff;
1780 high
= (high_low
>> 8) & 0xff;
1782 /* Collect measured throughputs for current and adjacent rates */
1783 current_tpt
= window
->average_tpt
;
1784 if (low
!= IWL_RATE_INVALID
)
1785 low_tpt
= tbl
->win
[low
].average_tpt
;
1786 if (high
!= IWL_RATE_INVALID
)
1787 high_tpt
= tbl
->win
[high
].average_tpt
;
1789 /* Assume rate increase */
1792 /* Too many failures, decrease rate */
1793 if ((window
->success_ratio
<= IWL_RATE_DECREASE_TH
) ||
1794 (current_tpt
== 0)) {
1795 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1798 /* No throughput measured yet for adjacent rates; try increase. */
1799 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
1800 (high_tpt
== IWL_INVALID_VALUE
))
1803 /* Both adjacent throughputs are measured, but neither one has better
1804 * throughput; we're using the best rate, don't change it! */
1805 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1806 (high_tpt
!= IWL_INVALID_VALUE
) &&
1807 (low_tpt
< current_tpt
) &&
1808 (high_tpt
< current_tpt
))
1811 /* At least one adjacent rate's throughput is measured,
1812 * and may have better performance. */
1814 /* Higher adjacent rate's throughput is measured */
1815 if (high_tpt
!= IWL_INVALID_VALUE
) {
1816 /* Higher rate has better throughput */
1817 if (high_tpt
> current_tpt
)
1821 ("decrease rate because of high tpt\n");
1825 /* Lower adjacent rate's throughput is measured */
1826 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
1827 /* Lower rate has better throughput */
1828 if (low_tpt
> current_tpt
) {
1830 ("decrease rate because of low tpt\n");
1837 /* Sanity check; asked for decrease, but success rate or throughput
1838 * has been good at old rate. Don't change it. */
1839 if (scale_action
== -1) {
1840 if ((low
!= IWL_RATE_INVALID
) &&
1841 ((window
->success_ratio
> IWL_RATE_HIGH_TH
) ||
1842 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
1845 /* Sanity check; asked for increase, but success rate has not been great
1846 * even at old rate, higher rate will be worse. Don't change it. */
1847 } else if ((scale_action
== 1) &&
1848 (window
->success_ratio
< IWL_RATE_INCREASE_TH
))
1851 switch (scale_action
) {
1853 /* Decrease starting rate, update uCode's rate table */
1854 if (low
!= IWL_RATE_INVALID
) {
1860 /* Increase starting rate, update uCode's rate table */
1861 if (high
!= IWL_RATE_INVALID
) {
1873 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1874 "high %d type %d\n",
1875 index
, scale_action
, low
, high
, tbl
->lq_type
);
1878 /* Replace uCode's rate table for the destination station. */
1880 rs_mcs_from_tbl(&mcs_rate
, tbl
, index
, is_green
);
1881 rs_fill_link_cmd(lq_sta
, &mcs_rate
, &lq_sta
->lq
);
1882 rs_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1885 /* Should we stay with this modulation mode, or search for a new one? */
1886 rs_stay_in_table(lq_sta
);
1889 * Search for new modulation mode if we're:
1890 * 1) Not changing rates right now
1891 * 2) Not just finishing up a search
1892 * 3) Allowing a new search
1894 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
) {
1895 /* Save current throughput to compare with "search" throughput*/
1896 lq_sta
->last_tpt
= current_tpt
;
1898 /* Select a new "search" modulation mode to try.
1899 * If one is found, set up the new "search" table. */
1900 if (is_legacy(tbl
->lq_type
))
1901 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
1902 else if (is_siso(tbl
->lq_type
))
1903 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
1905 rs_move_mimo_to_other(priv
, lq_sta
, conf
, sta
, index
);
1907 /* If new "search" mode was selected, set up in uCode table */
1908 if (lq_sta
->search_better_tbl
) {
1909 /* Access the "search" table, clear its history. */
1910 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1911 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1912 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1914 /* Use new "search" start rate */
1915 index
= iwl4965_rate_index_from_plcp(
1916 tbl
->current_rate
.rate_n_flags
);
1918 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
1919 tbl
->current_rate
.rate_n_flags
, index
);
1920 rs_fill_link_cmd(lq_sta
, &tbl
->current_rate
,
1922 rs_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1925 /* If the "active" (non-search) mode was legacy,
1926 * and we've tried switching antennas,
1927 * but we haven't been able to try HT modes (not available),
1928 * stay with best antenna legacy modulation for a while
1929 * before next round of mode comparisons. */
1930 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1931 if (is_legacy(tbl1
->lq_type
) &&
1932 #ifdef CONFIG_IWL4965_HT
1933 (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
)) &&
1935 (lq_sta
->action_counter
>= 1)) {
1936 lq_sta
->action_counter
= 0;
1937 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1938 rs_set_stay_in_table(1, lq_sta
);
1941 /* If we're in an HT mode, and all 3 mode switch actions
1942 * have been tried and compared, stay in this best modulation
1943 * mode for a while before next round of mode comparisons. */
1944 if (lq_sta
->enable_counter
&&
1945 (lq_sta
->action_counter
>= IWL_ACTION_LIMIT
)) {
1946 #ifdef CONFIG_IWL4965_HT_AGG
1947 /* If appropriate, set up aggregation! */
1948 if ((lq_sta
->last_tpt
> TID_AGG_TPT_THREHOLD
) &&
1949 (priv
->lq_mngr
.agg_ctrl
.auto_agg
)) {
1950 priv
->lq_mngr
.agg_ctrl
.tid_retry
=
1952 schedule_work(&priv
->agg_work
);
1954 #endif /*CONFIG_IWL4965_HT_AGG */
1955 lq_sta
->action_counter
= 0;
1956 rs_set_stay_in_table(0, lq_sta
);
1960 * Else, don't search for a new modulation mode.
1961 * Put new timestamp in stay-in-modulation-mode flush timer if:
1962 * 1) Not changing rates right now
1963 * 2) Not just finishing up a search
1964 * 3) flush timer is empty
1967 if ((!update_lq
) && (!done_search
) && (!lq_sta
->flush_timer
))
1968 lq_sta
->flush_timer
= jiffies
;
1972 rs_mcs_from_tbl(&tbl
->current_rate
, tbl
, index
, is_green
);
1974 sta
->last_txrate
= i
;
1976 /* sta->txrate is an index to A mode rates which start
1977 * at IWL_FIRST_OFDM_RATE
1979 if (lq_sta
->phymode
== (u8
) MODE_IEEE80211A
)
1980 sta
->txrate
= i
- IWL_FIRST_OFDM_RATE
;
1988 static void rs_initialize_lq(struct iwl4965_priv
*priv
,
1989 struct ieee80211_conf
*conf
,
1990 struct sta_info
*sta
)
1993 struct iwl4965_lq_sta
*lq_sta
;
1994 struct iwl4965_scale_tbl_info
*tbl
;
1997 u8 use_green
= rs_use_green(priv
, conf
);
1998 struct iwl4965_rate mcs_rate
;
2000 if (!sta
|| !sta
->rate_ctrl_priv
)
2003 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2004 i
= sta
->last_txrate
;
2006 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2007 (priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
))
2010 if (!lq_sta
->search_better_tbl
)
2011 active_tbl
= lq_sta
->active_tbl
;
2013 active_tbl
= 1 - lq_sta
->active_tbl
;
2015 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2017 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2020 mcs_rate
.rate_n_flags
= iwl4965_rates
[i
].plcp
;
2021 mcs_rate
.rate_n_flags
|= RATE_MCS_ANT_B_MSK
;
2022 mcs_rate
.rate_n_flags
&= ~RATE_MCS_ANT_A_MSK
;
2024 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2025 mcs_rate
.rate_n_flags
|= RATE_MCS_CCK_MSK
;
2027 tbl
->antenna_type
= ANT_AUX
;
2028 rs_get_tbl_info_from_mcs(&mcs_rate
, priv
->phymode
, tbl
, &rate_idx
);
2029 if (!rs_is_ant_connected(priv
->valid_antenna
, tbl
->antenna_type
))
2030 rs_toggle_antenna(&mcs_rate
, tbl
);
2032 rs_mcs_from_tbl(&mcs_rate
, tbl
, rate_idx
, use_green
);
2033 tbl
->current_rate
.rate_n_flags
= mcs_rate
.rate_n_flags
;
2034 rs_get_expected_tpt_table(lq_sta
, tbl
);
2035 rs_fill_link_cmd(lq_sta
, &mcs_rate
, &lq_sta
->lq
);
2036 rs_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2041 static void rs_get_rate(void *priv_rate
, struct net_device
*dev
,
2042 struct ieee80211_hw_mode
*mode
, struct sk_buff
*skb
,
2043 struct rate_selection
*sel
)
2047 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
2048 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2049 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2050 struct sta_info
*sta
;
2052 struct iwl4965_priv
*priv
= (struct iwl4965_priv
*)priv_rate
;
2053 struct iwl4965_lq_sta
*lq_sta
;
2055 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2057 sta
= sta_info_get(local
, hdr
->addr1
);
2059 /* Send management frames and broadcast/multicast data using lowest
2061 fc
= le16_to_cpu(hdr
->frame_control
);
2062 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
) ||
2063 !sta
|| !sta
->rate_ctrl_priv
) {
2064 sel
->rate
= rate_lowest(local
, local
->oper_hw_mode
, sta
);
2070 lq_sta
= (struct iwl4965_lq_sta
*)sta
->rate_ctrl_priv
;
2071 i
= sta
->last_txrate
;
2073 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
2074 !lq_sta
->ibss_sta_added
) {
2075 u8 sta_id
= iwl4965_hw_find_station(priv
, hdr
->addr1
);
2076 DECLARE_MAC_BUF(mac
);
2078 if (sta_id
== IWL_INVALID_STATION
) {
2079 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2080 print_mac(mac
, hdr
->addr1
));
2081 sta_id
= iwl4965_add_station_flags(priv
, hdr
->addr1
,
2082 0, CMD_ASYNC
, NULL
);
2084 if ((sta_id
!= IWL_INVALID_STATION
)) {
2085 lq_sta
->lq
.sta_id
= sta_id
;
2086 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2087 lq_sta
->ibss_sta_added
= 1;
2088 rs_initialize_lq(priv
, conf
, sta
);
2090 if (!lq_sta
->ibss_sta_added
)
2095 if ((i
< 0) || (i
> IWL_RATE_COUNT
)) {
2096 sel
->rate
= rate_lowest(local
, local
->oper_hw_mode
, sta
);
2101 sel
->rate
= &priv
->ieee_rates
[i
];
2104 static void *rs_alloc_sta(void *priv
, gfp_t gfp
)
2106 struct iwl4965_lq_sta
*lq_sta
;
2109 IWL_DEBUG_RATE("create station rate scale window\n");
2111 lq_sta
= kzalloc(sizeof(struct iwl4965_lq_sta
), gfp
);
2115 lq_sta
->lq
.sta_id
= 0xff;
2118 for (j
= 0; j
< LQ_SIZE
; j
++)
2119 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2120 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2125 static void rs_rate_init(void *priv_rate
, void *priv_sta
,
2126 struct ieee80211_local
*local
,
2127 struct sta_info
*sta
)
2130 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2131 struct ieee80211_hw_mode
*mode
= local
->oper_hw_mode
;
2132 struct iwl4965_priv
*priv
= (struct iwl4965_priv
*)priv_rate
;
2133 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2135 lq_sta
->flush_timer
= 0;
2136 lq_sta
->supp_rates
= sta
->supp_rates
;
2138 for (j
= 0; j
< LQ_SIZE
; j
++)
2139 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2140 rs_rate_scale_clear_window(&(lq_sta
->lq_info
[j
].win
[i
]));
2142 IWL_DEBUG_RATE("rate scale global init\n");
2143 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2144 * the lowest or the highest rate.. Could consider using RSSI from
2145 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2148 lq_sta
->ibss_sta_added
= 0;
2149 if (priv
->iw_mode
== IEEE80211_IF_TYPE_AP
) {
2150 u8 sta_id
= iwl4965_hw_find_station(priv
, sta
->addr
);
2151 DECLARE_MAC_BUF(mac
);
2153 /* for IBSS the call are from tasklet */
2154 IWL_DEBUG_HT("LQ: ADD station %s\n",
2155 print_mac(mac
, sta
->addr
));
2157 if (sta_id
== IWL_INVALID_STATION
) {
2158 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2159 print_mac(mac
, sta
->addr
));
2160 sta_id
= iwl4965_add_station_flags(priv
, sta
->addr
,
2161 0, CMD_ASYNC
, NULL
);
2163 if ((sta_id
!= IWL_INVALID_STATION
)) {
2164 lq_sta
->lq
.sta_id
= sta_id
;
2165 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2167 /* FIXME: this is w/a remove it later */
2168 priv
->assoc_station_added
= 1;
2171 /* Find highest tx rate supported by hardware and destination station */
2172 for (i
= 0; i
< mode
->num_rates
; i
++) {
2173 if ((sta
->supp_rates
& BIT(i
)) &&
2174 (mode
->rates
[i
].flags
& IEEE80211_RATE_SUPPORTED
))
2177 sta
->last_txrate
= sta
->txrate
;
2178 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2179 if (local
->hw
.conf
.phymode
== MODE_IEEE80211A
)
2180 sta
->last_txrate
+= IWL_FIRST_OFDM_RATE
;
2183 lq_sta
->valid_antenna
= priv
->valid_antenna
;
2184 lq_sta
->antenna
= priv
->antenna
;
2185 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2186 lq_sta
->active_rate
= priv
->active_rate
;
2187 lq_sta
->active_rate
&= ~(0x1000);
2188 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2189 lq_sta
->phymode
= priv
->phymode
;
2190 #ifdef CONFIG_IWL4965_HT
2192 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2193 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2195 lq_sta
->active_siso_rate
= (priv
->current_ht_config
.supp_mcs_set
[0] << 1);
2196 lq_sta
->active_siso_rate
|=
2197 (priv
->current_ht_config
.supp_mcs_set
[0] & 0x1);
2198 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2199 lq_sta
->active_siso_rate
=
2200 lq_sta
->active_siso_rate
<< IWL_FIRST_OFDM_RATE
;
2203 lq_sta
->active_mimo_rate
= (priv
->current_ht_config
.supp_mcs_set
[1] << 1);
2204 lq_sta
->active_mimo_rate
|=
2205 (priv
->current_ht_config
.supp_mcs_set
[1] & 0x1);
2206 lq_sta
->active_mimo_rate
&= ~((u16
)0x2);
2207 lq_sta
->active_mimo_rate
=
2208 lq_sta
->active_mimo_rate
<< IWL_FIRST_OFDM_RATE
;
2209 IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
2210 lq_sta
->active_siso_rate
,
2211 lq_sta
->active_mimo_rate
);
2212 #endif /*CONFIG_IWL4965_HT*/
2213 #ifdef CONFIG_MAC80211_DEBUGFS
2217 if (priv
->assoc_station_added
)
2218 priv
->lq_mngr
.lq_ready
= 1;
2220 rs_initialize_lq(priv
, conf
, sta
);
2223 static void rs_fill_link_cmd(struct iwl4965_lq_sta
*lq_sta
,
2224 struct iwl4965_rate
*tx_mcs
,
2225 struct iwl4965_link_quality_cmd
*lq_cmd
)
2229 int repeat_rate
= 0;
2230 u8 ant_toggle_count
= 0;
2231 u8 use_ht_possible
= 1;
2232 struct iwl4965_rate new_rate
;
2233 struct iwl4965_scale_tbl_info tbl_type
= { 0 };
2235 /* Override starting rate (index 0) if needed for debug purposes */
2236 rs_dbgfs_set_mcs(lq_sta
, tx_mcs
, index
);
2238 /* Interpret rate_n_flags */
2239 rs_get_tbl_info_from_mcs(tx_mcs
, lq_sta
->phymode
,
2240 &tbl_type
, &rate_idx
);
2242 /* How many times should we repeat the initial rate? */
2243 if (is_legacy(tbl_type
.lq_type
)) {
2244 ant_toggle_count
= 1;
2245 repeat_rate
= IWL_NUMBER_TRY
;
2247 repeat_rate
= IWL_HT_NUMBER_TRY
;
2249 lq_cmd
->general_params
.mimo_delimiter
=
2250 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2252 /* Fill 1st table entry (index 0) */
2253 lq_cmd
->rs_table
[index
].rate_n_flags
=
2254 cpu_to_le32(tx_mcs
->rate_n_flags
);
2255 new_rate
.rate_n_flags
= tx_mcs
->rate_n_flags
;
2257 if (is_mimo(tbl_type
.lq_type
) || (tbl_type
.antenna_type
== ANT_MAIN
))
2258 lq_cmd
->general_params
.single_stream_ant_msk
2259 = LINK_QUAL_ANT_A_MSK
;
2261 lq_cmd
->general_params
.single_stream_ant_msk
2262 = LINK_QUAL_ANT_B_MSK
;
2267 /* Fill rest of rate table */
2268 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2269 /* Repeat initial/next rate.
2270 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2271 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2272 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2273 if (is_legacy(tbl_type
.lq_type
)) {
2274 if (ant_toggle_count
<
2275 NUM_TRY_BEFORE_ANTENNA_TOGGLE
)
2278 rs_toggle_antenna(&new_rate
, &tbl_type
);
2279 ant_toggle_count
= 1;
2283 /* Override next rate if needed for debug purposes */
2284 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2286 /* Fill next table entry */
2287 lq_cmd
->rs_table
[index
].rate_n_flags
=
2288 cpu_to_le32(new_rate
.rate_n_flags
);
2293 rs_get_tbl_info_from_mcs(&new_rate
, lq_sta
->phymode
, &tbl_type
,
2296 /* Indicate to uCode which entries might be MIMO.
2297 * If initial rate was MIMO, this will finally end up
2298 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2299 if (is_mimo(tbl_type
.lq_type
))
2300 lq_cmd
->general_params
.mimo_delimiter
= index
;
2303 rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2304 use_ht_possible
, &new_rate
);
2306 /* How many times should we repeat the next rate? */
2307 if (is_legacy(tbl_type
.lq_type
)) {
2308 if (ant_toggle_count
< NUM_TRY_BEFORE_ANTENNA_TOGGLE
)
2311 rs_toggle_antenna(&new_rate
, &tbl_type
);
2312 ant_toggle_count
= 1;
2314 repeat_rate
= IWL_NUMBER_TRY
;
2316 repeat_rate
= IWL_HT_NUMBER_TRY
;
2318 /* Don't allow HT rates after next pass.
2319 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2320 use_ht_possible
= 0;
2322 /* Override next rate if needed for debug purposes */
2323 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2325 /* Fill next table entry */
2326 lq_cmd
->rs_table
[index
].rate_n_flags
=
2327 cpu_to_le32(new_rate
.rate_n_flags
);
2333 lq_cmd
->general_params
.dual_stream_ant_msk
= 3;
2334 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2335 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2338 static void *rs_alloc(struct ieee80211_local
*local
)
2340 return local
->hw
.priv
;
2342 /* rate scale requires free function to be implemented */
2343 static void rs_free(void *priv_rate
)
2348 static void rs_clear(void *priv_rate
)
2350 struct iwl4965_priv
*priv
= (struct iwl4965_priv
*) priv_rate
;
2352 IWL_DEBUG_RATE("enter\n");
2354 priv
->lq_mngr
.lq_ready
= 0;
2355 #ifdef CONFIG_IWL4965_HT
2356 #ifdef CONFIG_IWL4965_HT_AGG
2357 if (priv
->lq_mngr
.agg_ctrl
.granted_ba
)
2358 iwl4965_turn_off_agg(priv
, TID_ALL_SPECIFIED
);
2359 #endif /*CONFIG_IWL4965_HT_AGG */
2360 #endif /* CONFIG_IWL4965_HT */
2362 IWL_DEBUG_RATE("leave\n");
2365 static void rs_free_sta(void *priv
, void *priv_sta
)
2367 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2369 IWL_DEBUG_RATE("enter\n");
2371 IWL_DEBUG_RATE("leave\n");
2375 #ifdef CONFIG_MAC80211_DEBUGFS
2376 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2378 file
->private_data
= inode
->i_private
;
2381 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta
*lq_sta
,
2382 struct iwl4965_rate
*mcs
, int index
)
2386 if (lq_sta
->phymode
== (u8
) MODE_IEEE80211A
)
2391 if (lq_sta
->dbg_fixed
.rate_n_flags
) {
2393 mcs
->rate_n_flags
= lq_sta
->dbg_fixed
.rate_n_flags
;
2395 mcs
->rate_n_flags
= base_rate
;
2396 IWL_DEBUG_RATE("Fixed rate ON\n");
2400 IWL_DEBUG_RATE("Fixed rate OFF\n");
2403 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2404 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2406 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2411 memset(buf
, 0, sizeof(buf
));
2412 buf_size
= min(count
, sizeof(buf
) - 1);
2413 if (copy_from_user(buf
, user_buf
, buf_size
))
2416 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2417 lq_sta
->dbg_fixed
.rate_n_flags
= parsed_rate
;
2419 lq_sta
->dbg_fixed
.rate_n_flags
= 0;
2421 lq_sta
->active_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2422 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2423 lq_sta
->active_mimo_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2425 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2426 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed
.rate_n_flags
);
2428 if (lq_sta
->dbg_fixed
.rate_n_flags
) {
2429 rs_fill_link_cmd(lq_sta
, &lq_sta
->dbg_fixed
, &lq_sta
->lq
);
2430 rs_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2436 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2437 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2443 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2445 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2446 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2447 lq_sta
->total_failed
, lq_sta
->total_success
,
2448 lq_sta
->active_rate
);
2449 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2450 lq_sta
->dbg_fixed
.rate_n_flags
);
2451 desc
+= sprintf(buff
+desc
, "general:"
2452 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2453 lq_sta
->lq
.general_params
.flags
,
2454 lq_sta
->lq
.general_params
.mimo_delimiter
,
2455 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2456 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2458 desc
+= sprintf(buff
+desc
, "agg:"
2459 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2460 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2461 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2462 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2464 desc
+= sprintf(buff
+desc
,
2465 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2466 lq_sta
->lq
.general_params
.start_rate_index
[0],
2467 lq_sta
->lq
.general_params
.start_rate_index
[1],
2468 lq_sta
->lq
.general_params
.start_rate_index
[2],
2469 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2472 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
2473 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X\n",
2474 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2476 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2479 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2480 .write
= rs_sta_dbgfs_scale_table_write
,
2481 .read
= rs_sta_dbgfs_scale_table_read
,
2482 .open
= open_file_generic
,
2484 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2485 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2491 struct iwl4965_lq_sta
*lq_sta
= file
->private_data
;
2492 for (i
= 0; i
< LQ_SIZE
; i
++) {
2493 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2495 lq_sta
->active_tbl
== i
?"*":"x",
2496 lq_sta
->lq_info
[i
].lq_type
,
2497 lq_sta
->lq_info
[i
].is_SGI
,
2498 lq_sta
->lq_info
[i
].is_fat
,
2499 lq_sta
->lq_info
[i
].is_dup
,
2500 lq_sta
->lq_info
[i
].current_rate
.rate_n_flags
);
2501 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2502 desc
+= sprintf(buff
+desc
,
2503 "counter=%d success=%d %%=%d\n",
2504 lq_sta
->lq_info
[i
].win
[j
].counter
,
2505 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2506 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2509 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2512 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2513 .read
= rs_sta_dbgfs_stats_table_read
,
2514 .open
= open_file_generic
,
2517 static void rs_add_debugfs(void *priv
, void *priv_sta
,
2520 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2521 lq_sta
->rs_sta_dbgfs_scale_table_file
=
2522 debugfs_create_file("rate_scale_table", 0600, dir
,
2523 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
2524 lq_sta
->rs_sta_dbgfs_stats_table_file
=
2525 debugfs_create_file("rate_stats_table", 0600, dir
,
2526 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
2529 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
2531 struct iwl4965_lq_sta
*lq_sta
= priv_sta
;
2532 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
2533 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
2537 static struct rate_control_ops rs_ops
= {
2540 .tx_status
= rs_tx_status
,
2541 .get_rate
= rs_get_rate
,
2542 .rate_init
= rs_rate_init
,
2546 .alloc_sta
= rs_alloc_sta
,
2547 .free_sta
= rs_free_sta
,
2548 #ifdef CONFIG_MAC80211_DEBUGFS
2549 .add_sta_debugfs
= rs_add_debugfs
,
2550 .remove_sta_debugfs
= rs_remove_debugfs
,
2554 int iwl4965_fill_rs_info(struct ieee80211_hw
*hw
, char *buf
, u8 sta_id
)
2556 struct ieee80211_local
*local
= hw_to_local(hw
);
2557 struct iwl4965_priv
*priv
= hw
->priv
;
2558 struct iwl4965_lq_sta
*lq_sta
;
2559 struct sta_info
*sta
;
2561 u32 samples
= 0, success
= 0, good
= 0;
2562 unsigned long now
= jiffies
;
2564 u8 lq_type
, antenna
;
2566 sta
= sta_info_get(local
, priv
->stations
[sta_id
].sta
.sta
.addr
);
2567 if (!sta
|| !sta
->rate_ctrl_priv
) {
2570 IWL_DEBUG_RATE("leave - no private rate data!\n");
2572 IWL_DEBUG_RATE("leave - no station!\n");
2573 return sprintf(buf
, "station %d not found\n", sta_id
);
2576 lq_sta
= (void *)sta
->rate_ctrl_priv
;
2578 lq_type
= lq_sta
->lq_info
[lq_sta
->active_tbl
].lq_type
;
2579 antenna
= lq_sta
->lq_info
[lq_sta
->active_tbl
].antenna_type
;
2581 if (is_legacy(lq_type
))
2582 i
= IWL_RATE_54M_INDEX
;
2584 i
= IWL_RATE_60M_INDEX
;
2588 int active
= lq_sta
->active_tbl
;
2591 sprintf(&buf
[cnt
], " %2dMbs: ", iwl4965_rates
[i
].ieee
/ 2);
2593 mask
= (1ULL << (IWL_RATE_MAX_WINDOW
- 1));
2594 for (j
= 0; j
< IWL_RATE_MAX_WINDOW
; j
++, mask
>>= 1)
2596 (lq_sta
->lq_info
[active
].win
[i
].data
& mask
)
2599 samples
+= lq_sta
->lq_info
[active
].win
[i
].counter
;
2600 good
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
;
2601 success
+= lq_sta
->lq_info
[active
].win
[i
].success_counter
*
2602 iwl4965_rates
[i
].ieee
;
2604 if (lq_sta
->lq_info
[active
].win
[i
].stamp
) {
2606 jiffies_to_msecs(now
-
2607 lq_sta
->lq_info
[active
].win
[i
].stamp
);
2609 if (delta
> max_time
)
2612 cnt
+= sprintf(&buf
[cnt
], "%5dms\n", delta
);
2616 j
= iwl4965_get_prev_ieee_rate(i
);
2622 /* Display the average rate of all samples taken.
2624 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2625 * added from iwl4965_rates is actually 2X the rate */
2627 cnt
+= sprintf(&buf
[cnt
],
2628 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2629 "%3d%% success (%d good packets over %d tries)\n",
2630 success
/ (2 * samples
), (success
* 5 / samples
) % 10,
2631 max_time
, good
* 100 / samples
, good
, samples
);
2633 cnt
+= sprintf(&buf
[cnt
], "\nAverage rate: 0Mbs\n");
2635 cnt
+= sprintf(&buf
[cnt
], "\nrate scale type %d antenna %d "
2636 "active_search %d rate index %d\n", lq_type
, antenna
,
2637 lq_sta
->search_better_tbl
, sta
->last_txrate
);
2643 void iwl4965_rate_scale_init(struct ieee80211_hw
*hw
, s32 sta_id
)
2645 struct iwl4965_priv
*priv
= hw
->priv
;
2647 priv
->lq_mngr
.lq_ready
= 1;
2650 void iwl4965_rate_control_register(struct ieee80211_hw
*hw
)
2652 ieee80211_rate_control_register(&rs_ops
);
2655 void iwl4965_rate_control_unregister(struct ieee80211_hw
*hw
)
2657 ieee80211_rate_control_unregister(&rs_ops
);