1 /******************************************************************************
3 * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
21 * Contact Information:
22 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
36 #include <linux/workqueue.h>
38 #include "../net/mac80211/rate.h"
43 #include "iwl-helpers.h"
45 #define RS_NAME "iwl-agn-rs"
47 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
48 #define IWL_NUMBER_TRY 1
49 #define IWL_HT_NUMBER_TRY 3
51 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
52 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
53 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
58 static u8 rs_ht_to_legacy
[] = {
59 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
60 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
62 IWL_RATE_6M_INDEX
, IWL_RATE_9M_INDEX
,
63 IWL_RATE_12M_INDEX
, IWL_RATE_18M_INDEX
,
64 IWL_RATE_24M_INDEX
, IWL_RATE_36M_INDEX
,
65 IWL_RATE_48M_INDEX
, IWL_RATE_54M_INDEX
68 static const u8 ant_toggle_lookup
[] = {
69 /*ANT_NONE -> */ ANT_NONE
,
72 /*ANT_AB -> */ ANT_BC
,
74 /*ANT_AC -> */ ANT_AB
,
75 /*ANT_BC -> */ ANT_AC
,
76 /*ANT_ABC -> */ ANT_ABC
,
80 * struct iwl_rate_scale_data -- tx success history for one rate
82 struct iwl_rate_scale_data
{
83 u64 data
; /* bitmap of successful frames */
84 s32 success_counter
; /* number of frames successful */
85 s32 success_ratio
; /* per-cent * 128 */
86 s32 counter
; /* number of frames attempted */
87 s32 average_tpt
; /* success ratio * expected throughput */
92 * struct iwl_scale_tbl_info -- tx params and success history for all rates
94 * There are two of these in struct iwl_lq_sta,
95 * one for "active", and one for "search".
97 struct iwl_scale_tbl_info
{
98 enum iwl_table_type lq_type
;
100 u8 is_SGI
; /* 1 = short guard interval */
101 u8 is_fat
; /* 1 = 40 MHz channel width */
102 u8 is_dup
; /* 1 = duplicated data streams */
103 u8 action
; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
104 s32
*expected_tpt
; /* throughput metrics; expected_tpt_G, etc. */
105 u32 current_rate
; /* rate_n_flags, uCode API format */
106 struct iwl_rate_scale_data win
[IWL_RATE_COUNT
]; /* rate histories */
109 struct iwl_traffic_load
{
110 unsigned long time_stamp
; /* age of the oldest statistics */
111 u32 packet_count
[TID_QUEUE_MAX_SIZE
]; /* packet count in this time
113 u32 total
; /* total num of packets during the
114 * last TID_MAX_TIME_DIFF */
115 u8 queue_count
; /* number of queues that has
116 * been used since the last cleanup */
117 u8 head
; /* start of the circular buffer */
121 * struct iwl_lq_sta -- driver's rate scaling private structure
123 * Pointer to this gets passed back and forth between driver and mac80211.
126 u8 active_tbl
; /* index of active table, range 0-1 */
127 u8 enable_counter
; /* indicates HT mode */
128 u8 stay_in_tbl
; /* 1: disallow, 0: allow search for new mode */
129 u8 search_better_tbl
; /* 1: currently trying alternate mode */
132 /* The following determine when to search for a new mode */
133 u32 table_count_limit
;
134 u32 max_failure_limit
; /* # failed frames before new search */
135 u32 max_success_limit
; /* # successful frames before new search */
137 u32 total_failed
; /* total failed frames, any/all rates */
138 u32 total_success
; /* total successful frames, any/all rates */
139 u32 flush_timer
; /* time staying in mode before new search */
141 u8 action_counter
; /* # mode-switch actions tried */
144 enum ieee80211_band band
;
147 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
149 u16 active_legacy_rate
;
150 u16 active_siso_rate
;
151 u16 active_mimo2_rate
;
152 u16 active_mimo3_rate
;
153 u16 active_rate_basic
;
155 struct iwl_link_quality_cmd lq
;
156 struct iwl_scale_tbl_info lq_info
[LQ_SIZE
]; /* "active", "search" */
157 struct iwl_traffic_load load
[TID_MAX_LOAD_COUNT
];
159 #ifdef CONFIG_MAC80211_DEBUGFS
160 struct dentry
*rs_sta_dbgfs_scale_table_file
;
161 struct dentry
*rs_sta_dbgfs_stats_table_file
;
162 struct dentry
*rs_sta_dbgfs_tx_agg_tid_en_file
;
165 struct iwl_priv
*drv
;
168 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
169 struct net_device
*dev
,
170 struct ieee80211_hdr
*hdr
,
171 struct sta_info
*sta
);
172 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
173 struct iwl_lq_sta
*lq_sta
, u32 rate_n_flags
);
176 #ifdef CONFIG_MAC80211_DEBUGFS
177 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
178 u32
*rate_n_flags
, int index
);
180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
181 u32
*rate_n_flags
, int index
)
186 * Expected throughput metrics for following rates:
187 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
188 * "G" is the only table that supports CCK (the first 4 rates).
190 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
191 static s32 expected_tpt_A
[IWL_RATE_COUNT
] = {
192 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
195 static s32 expected_tpt_G
[IWL_RATE_COUNT
] = {
196 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
199 static s32 expected_tpt_siso20MHz
[IWL_RATE_COUNT
] = {
200 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
203 static s32 expected_tpt_siso20MHzSGI
[IWL_RATE_COUNT
] = {
204 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
207 static s32 expected_tpt_mimo20MHz
[IWL_RATE_COUNT
] = {
208 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
211 static s32 expected_tpt_mimo20MHzSGI
[IWL_RATE_COUNT
] = {
212 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
215 static s32 expected_tpt_siso40MHz
[IWL_RATE_COUNT
] = {
216 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
219 static s32 expected_tpt_siso40MHzSGI
[IWL_RATE_COUNT
] = {
220 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
223 static s32 expected_tpt_mimo40MHz
[IWL_RATE_COUNT
] = {
224 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
227 static s32 expected_tpt_mimo40MHzSGI
[IWL_RATE_COUNT
] = {
228 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
231 static inline u8
rs_extract_rate(u32 rate_n_flags
)
233 return (u8
)(rate_n_flags
& 0xFF);
236 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data
*window
)
239 window
->success_counter
= 0;
240 window
->success_ratio
= IWL_INVALID_VALUE
;
242 window
->average_tpt
= IWL_INVALID_VALUE
;
246 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
248 return (ant_type
& valid_antenna
) == ant_type
;
252 * removes the old data from the statistics. All data that is older than
253 * TID_MAX_TIME_DIFF, will be deleted.
255 static void rs_tl_rm_old_stats(struct iwl_traffic_load
*tl
, u32 curr_time
)
257 /* The oldest age we want to keep */
258 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
260 while (tl
->queue_count
&&
261 (tl
->time_stamp
< oldest_time
)) {
262 tl
->total
-= tl
->packet_count
[tl
->head
];
263 tl
->packet_count
[tl
->head
] = 0;
264 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
267 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
273 * increment traffic load value for tid and also remove
274 * any old values if passed the certain time period
276 static u8
rs_tl_add_packet(struct iwl_lq_sta
*lq_data
,
277 struct ieee80211_hdr
*hdr
)
279 u32 curr_time
= jiffies_to_msecs(jiffies
);
282 struct iwl_traffic_load
*tl
= NULL
;
283 __le16 fc
= hdr
->frame_control
;
286 if (ieee80211_is_data_qos(fc
)) {
287 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
290 return MAX_TID_COUNT
;
292 tl
= &lq_data
->load
[tid
];
294 curr_time
-= curr_time
% TID_ROUND_VALUE
;
296 /* Happens only for the first packet. Initialize the data */
297 if (!(tl
->queue_count
)) {
299 tl
->time_stamp
= curr_time
;
302 tl
->packet_count
[0] = 1;
303 return MAX_TID_COUNT
;
306 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
307 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
309 /* The history is too long: remove data that is older than */
310 /* TID_MAX_TIME_DIFF */
311 if (index
>= TID_QUEUE_MAX_SIZE
)
312 rs_tl_rm_old_stats(tl
, curr_time
);
314 index
= (tl
->head
+ index
) % TID_QUEUE_MAX_SIZE
;
315 tl
->packet_count
[index
] = tl
->packet_count
[index
] + 1;
316 tl
->total
= tl
->total
+ 1;
318 if ((index
+ 1) > tl
->queue_count
)
319 tl
->queue_count
= index
+ 1;
325 get the traffic load value for tid
327 static u32
rs_tl_get_load(struct iwl_lq_sta
*lq_data
, u8 tid
)
329 u32 curr_time
= jiffies_to_msecs(jiffies
);
332 struct iwl_traffic_load
*tl
= NULL
;
334 if (tid
>= TID_MAX_LOAD_COUNT
)
337 tl
= &(lq_data
->load
[tid
]);
339 curr_time
-= curr_time
% TID_ROUND_VALUE
;
341 if (!(tl
->queue_count
))
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
);
355 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv
*priv
,
356 struct iwl_lq_sta
*lq_data
, u8 tid
,
357 struct sta_info
*sta
)
360 DECLARE_MAC_BUF(mac
);
362 spin_lock_bh(&sta
->lock
);
363 state
= sta
->ampdu_mlme
.tid_state_tx
[tid
];
364 spin_unlock_bh(&sta
->lock
);
366 if (state
== HT_AGG_STATE_IDLE
&&
367 rs_tl_get_load(lq_data
, tid
) > IWL_AGG_LOAD_THRESHOLD
) {
368 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
369 print_mac(mac
, sta
->addr
), tid
);
370 ieee80211_start_tx_ba_session(priv
->hw
, sta
->addr
, tid
);
374 static void rs_tl_turn_on_agg(struct iwl_priv
*priv
, u8 tid
,
375 struct iwl_lq_sta
*lq_data
,
376 struct sta_info
*sta
)
378 if ((tid
< TID_MAX_LOAD_COUNT
))
379 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
380 else if (tid
== IWL_AGG_ALL_TID
)
381 for (tid
= 0; tid
< TID_MAX_LOAD_COUNT
; tid
++)
382 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
385 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
387 return !!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
388 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
389 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
);
393 * rs_collect_tx_data - Update the success/failure sliding window
395 * We keep a sliding window of the last 62 packets transmitted
396 * at this rate. window->data contains the bitmask of successful
399 static int rs_collect_tx_data(struct iwl_rate_scale_data
*windows
,
400 int scale_index
, s32 tpt
, int retries
,
403 struct iwl_rate_scale_data
*window
= NULL
;
404 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
407 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
410 /* Select data for current tx bit rate */
411 window
= &(windows
[scale_index
]);
414 * Keep track of only the latest 62 tx frame attempts in this rate's
415 * history window; anything older isn't really relevant any more.
416 * If we have filled up the sliding window, drop the oldest attempt;
417 * if the oldest attempt (highest bit in bitmap) shows "success",
418 * subtract "1" from the success counter (this is the main reason
419 * we keep these bitmaps!).
421 while (retries
> 0) {
422 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
424 /* remove earliest */
425 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
427 if (window
->data
& mask
) {
428 window
->data
&= ~mask
;
429 window
->success_counter
--;
433 /* Increment frames-attempted counter */
436 /* Shift bitmap by one frame (throw away oldest history),
437 * OR in "1", and increment "success" if this
438 * frame was successful. */
441 window
->success_counter
++;
449 /* Calculate current success ratio, avoid divide-by-0! */
450 if (window
->counter
> 0)
451 window
->success_ratio
= 128 * (100 * window
->success_counter
)
454 window
->success_ratio
= IWL_INVALID_VALUE
;
456 fail_count
= window
->counter
- window
->success_counter
;
458 /* Calculate average throughput, if we have enough history. */
459 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
460 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
461 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
463 window
->average_tpt
= IWL_INVALID_VALUE
;
465 /* Tag this window as having been updated */
466 window
->stamp
= jiffies
;
472 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
474 /* FIXME:RS:remove this function and put the flags statically in the table */
475 static u32
rate_n_flags_from_tbl(struct iwl_scale_tbl_info
*tbl
,
476 int index
, u8 use_green
)
478 u32 rate_n_flags
= 0;
480 if (is_legacy(tbl
->lq_type
)) {
481 rate_n_flags
= iwl_rates
[index
].plcp
;
482 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
483 rate_n_flags
|= RATE_MCS_CCK_MSK
;
485 } else if (is_Ht(tbl
->lq_type
)) {
486 if (index
> IWL_LAST_OFDM_RATE
) {
487 IWL_ERROR("invalid HT rate index %d\n", index
);
488 index
= IWL_LAST_OFDM_RATE
;
490 rate_n_flags
= RATE_MCS_HT_MSK
;
492 if (is_siso(tbl
->lq_type
))
493 rate_n_flags
|= iwl_rates
[index
].plcp_siso
;
494 else if (is_mimo2(tbl
->lq_type
))
495 rate_n_flags
|= iwl_rates
[index
].plcp_mimo2
;
497 rate_n_flags
|= iwl_rates
[index
].plcp_mimo3
;
499 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl
->lq_type
);
502 rate_n_flags
|= ((tbl
->ant_type
<< RATE_MCS_ANT_POS
) &
503 RATE_MCS_ANT_ABC_MSK
);
505 if (is_Ht(tbl
->lq_type
)) {
508 rate_n_flags
|= RATE_MCS_DUP_MSK
;
510 rate_n_flags
|= RATE_MCS_FAT_MSK
;
513 rate_n_flags
|= RATE_MCS_SGI_MSK
;
516 rate_n_flags
|= RATE_MCS_GF_MSK
;
517 if (is_siso(tbl
->lq_type
) && tbl
->is_SGI
) {
518 rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
519 IWL_ERROR("GF was set with SGI:SISO\n");
527 * Interpret uCode API's rate_n_flags format,
528 * fill "search" or "active" tx mode table.
530 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags
,
531 enum ieee80211_band band
,
532 struct iwl_scale_tbl_info
*tbl
,
535 u32 ant_msk
= (rate_n_flags
& RATE_MCS_ANT_ABC_MSK
);
536 u8 num_of_ant
= get_num_of_ant_from_rate(rate_n_flags
);
539 *rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
541 if (*rate_idx
== IWL_RATE_INVALID
) {
545 tbl
->is_SGI
= 0; /* default legacy setup */
548 tbl
->ant_type
= (ant_msk
>> RATE_MCS_ANT_POS
);
549 tbl
->lq_type
= LQ_NONE
;
551 /* legacy rate format */
552 if (!(rate_n_flags
& RATE_MCS_HT_MSK
)) {
553 if (num_of_ant
== 1) {
554 if (band
== IEEE80211_BAND_5GHZ
)
561 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
564 if ((rate_n_flags
& RATE_MCS_FAT_MSK
) ||
565 (rate_n_flags
& RATE_MCS_DUP_MSK
))
568 if (rate_n_flags
& RATE_MCS_DUP_MSK
)
571 mcs
= rs_extract_rate(rate_n_flags
);
574 if (mcs
<= IWL_RATE_SISO_60M_PLCP
) {
576 tbl
->lq_type
= LQ_SISO
; /*else NONE*/
578 } else if (mcs
<= IWL_RATE_MIMO2_60M_PLCP
) {
580 tbl
->lq_type
= LQ_MIMO2
;
584 tbl
->lq_type
= LQ_MIMO3
;
590 /* switch to another antenna/antennas and return 1 */
591 /* if no other valid antenna found, return 0 */
592 static int rs_toggle_antenna(u32 valid_ant
, u32
*rate_n_flags
,
593 struct iwl_scale_tbl_info
*tbl
)
597 if (!tbl
->ant_type
|| tbl
->ant_type
> ANT_ABC
)
600 if (!rs_is_valid_ant(valid_ant
, tbl
->ant_type
))
603 new_ant_type
= ant_toggle_lookup
[tbl
->ant_type
];
605 while ((new_ant_type
!= tbl
->ant_type
) &&
606 !rs_is_valid_ant(valid_ant
, new_ant_type
))
607 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
609 if (new_ant_type
== tbl
->ant_type
)
612 tbl
->ant_type
= new_ant_type
;
613 *rate_n_flags
&= ~RATE_MCS_ANT_ABC_MSK
;
614 *rate_n_flags
|= new_ant_type
<< RATE_MCS_ANT_POS
;
618 /* FIXME:RS: in 4965 we don't use greenfield at all */
619 /* FIXME:RS: don't use greenfield for now in TX */
621 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
623 return (conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) &&
624 priv
->current_ht_config
.is_green_field
&&
625 !priv
->current_ht_config
.non_GF_STA_present
;
628 static inline u8
rs_use_green(struct iwl_priv
*priv
, struct ieee80211_conf
*conf
)
634 * rs_get_supported_rates - get the available rates
636 * if management frame or broadcast frame only return
637 * basic available rates.
640 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
641 struct ieee80211_hdr
*hdr
,
642 enum iwl_table_type rate_type
)
644 if (hdr
&& is_multicast_ether_addr(hdr
->addr1
) &&
645 lq_sta
->active_rate_basic
)
646 return lq_sta
->active_rate_basic
;
648 if (is_legacy(rate_type
)) {
649 return lq_sta
->active_legacy_rate
;
651 if (is_siso(rate_type
))
652 return lq_sta
->active_siso_rate
;
653 else if (is_mimo2(rate_type
))
654 return lq_sta
->active_mimo2_rate
;
656 return lq_sta
->active_mimo3_rate
;
660 static u16
rs_get_adjacent_rate(struct iwl_priv
*priv
, u8 index
, u16 rate_mask
,
663 u8 high
= IWL_RATE_INVALID
;
664 u8 low
= IWL_RATE_INVALID
;
666 /* 802.11A or ht walks to the next literal adjacent rate in
668 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
672 /* Find the previous rate that is in the rate mask */
674 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
675 if (rate_mask
& mask
) {
681 /* Find the next rate that is in the rate mask */
683 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
684 if (rate_mask
& mask
) {
690 return (high
<< 8) | low
;
694 while (low
!= IWL_RATE_INVALID
) {
695 low
= iwl_rates
[low
].prev_rs
;
696 if (low
== IWL_RATE_INVALID
)
698 if (rate_mask
& (1 << low
))
700 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low
);
704 while (high
!= IWL_RATE_INVALID
) {
705 high
= iwl_rates
[high
].next_rs
;
706 if (high
== IWL_RATE_INVALID
)
708 if (rate_mask
& (1 << high
))
710 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high
);
713 return (high
<< 8) | low
;
716 static u32
rs_get_lower_rate(struct iwl_lq_sta
*lq_sta
,
717 struct iwl_scale_tbl_info
*tbl
,
718 u8 scale_index
, u8 ht_possible
)
723 u8 switch_to_legacy
= 0;
724 u8 is_green
= lq_sta
->is_green
;
726 /* check if we need to switch from HT to legacy rates.
727 * assumption is that mandatory rates (1Mbps or 6Mbps)
728 * are always supported (spec demand) */
729 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
730 switch_to_legacy
= 1;
731 scale_index
= rs_ht_to_legacy
[scale_index
];
732 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
737 if (num_of_ant(tbl
->ant_type
) > 1)
738 tbl
->ant_type
= ANT_A
;/*FIXME:RS*/
744 rate_mask
= rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
);
746 /* Mask with station rate restriction */
747 if (is_legacy(tbl
->lq_type
)) {
748 /* supp_rates has no CCK bits in A mode */
749 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
750 rate_mask
= (u16
)(rate_mask
&
751 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
753 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
756 /* If we switched from HT to legacy, check current rate */
757 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
762 high_low
= rs_get_adjacent_rate(lq_sta
->drv
, scale_index
, rate_mask
,
764 low
= high_low
& 0xff;
766 if (low
== IWL_RATE_INVALID
)
770 return rate_n_flags_from_tbl(tbl
, low
, is_green
);
774 * mac80211 sends us Tx status
776 static void rs_tx_status(void *priv_rate
, struct net_device
*dev
,
781 int rs_index
, index
= 0;
782 struct iwl_lq_sta
*lq_sta
;
783 struct iwl_link_quality_cmd
*table
;
784 struct sta_info
*sta
;
785 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
786 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
787 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
788 struct ieee80211_hw
*hw
= local_to_hw(local
);
789 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
790 struct iwl_rate_scale_data
*window
= NULL
;
791 struct iwl_rate_scale_data
*search_win
= NULL
;
793 struct iwl_scale_tbl_info tbl_type
;
794 struct iwl_scale_tbl_info
*curr_tbl
, *search_tbl
;
796 __le16 fc
= hdr
->frame_control
;
799 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
801 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
))
804 /* This packet was aggregated but doesn't carry rate scale info */
805 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
806 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
809 retries
= info
->status
.retry_count
;
816 sta
= sta_info_get(local
, hdr
->addr1
);
818 if (!sta
|| !sta
->rate_ctrl_priv
)
822 lq_sta
= (struct iwl_lq_sta
*)sta
->rate_ctrl_priv
;
824 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
825 !lq_sta
->ibss_sta_added
)
829 active_index
= lq_sta
->active_tbl
;
831 curr_tbl
= &(lq_sta
->lq_info
[active_index
]);
832 search_tbl
= &(lq_sta
->lq_info
[(1 - active_index
)]);
833 window
= (struct iwl_rate_scale_data
*)&(curr_tbl
->win
[0]);
834 search_win
= (struct iwl_rate_scale_data
*)&(search_tbl
->win
[0]);
837 * Ignore this Tx frame response if its initial rate doesn't match
838 * that of latest Link Quality command. There may be stragglers
839 * from a previous Link Quality command, but we're no longer interested
840 * in those; they're either from the "active" mode while we're trying
841 * to check "search" mode, or a prior "search" mode after we've moved
842 * to a new "search" mode (which might become the new "active" mode).
844 tx_rate
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
845 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
846 if (priv
->band
== IEEE80211_BAND_5GHZ
)
847 rs_index
-= IWL_FIRST_OFDM_RATE
;
849 if ((info
->tx_rate_idx
< 0) ||
851 !!(info
->flags
& IEEE80211_TX_CTL_SHORT_GI
)) ||
853 !!(info
->flags
& IEEE80211_TX_CTL_40_MHZ_WIDTH
)) ||
855 !!(info
->flags
& IEEE80211_TX_CTL_DUP_DATA
)) ||
856 (tbl_type
.ant_type
^ info
->antenna_sel_tx
) ||
857 (!!(tx_rate
& RATE_MCS_HT_MSK
) ^
858 !!(info
->flags
& IEEE80211_TX_CTL_OFDM_HT
)) ||
859 (!!(tx_rate
& RATE_MCS_GF_MSK
) ^
860 !!(info
->flags
& IEEE80211_TX_CTL_GREEN_FIELD
)) ||
861 (hw
->wiphy
->bands
[priv
->band
]->bitrates
[rs_index
].bitrate
!=
862 hw
->wiphy
->bands
[info
->band
]->bitrates
[info
->tx_rate_idx
].bitrate
)) {
863 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate
);
867 /* Update frame history window with "failure" for each Tx retry. */
869 /* Look up the rate and other info used for each tx attempt.
870 * Each tx attempt steps one entry deeper in the rate table. */
871 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
872 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
,
873 &tbl_type
, &rs_index
);
875 /* If type matches "search" table,
876 * add failure to "search" history */
877 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
878 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
879 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
880 if (search_tbl
->expected_tpt
)
881 tpt
= search_tbl
->expected_tpt
[rs_index
];
884 rs_collect_tx_data(search_win
, rs_index
, tpt
, 1, 0);
886 /* Else if type matches "current/active" table,
887 * add failure to "current/active" history */
888 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
889 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
890 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
891 if (curr_tbl
->expected_tpt
)
892 tpt
= curr_tbl
->expected_tpt
[rs_index
];
895 rs_collect_tx_data(window
, rs_index
, tpt
, 1, 0);
898 /* If not searching for a new mode, increment failed counter
899 * ... this helps determine when to start searching again */
900 if (lq_sta
->stay_in_tbl
)
901 lq_sta
->total_failed
++;
908 * Find (by rate) the history window to update with final Tx attempt;
909 * if Tx was successful first try, use original rate,
910 * else look up the rate that was, finally, successful.
912 tx_rate
= le32_to_cpu(table
->rs_table
[index
].rate_n_flags
);
913 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
915 /* Update frame history window with "success" if Tx got ACKed ... */
916 status
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
918 /* If type matches "search" table,
919 * add final tx status to "search" history */
920 if ((tbl_type
.lq_type
== search_tbl
->lq_type
) &&
921 (tbl_type
.ant_type
== search_tbl
->ant_type
) &&
922 (tbl_type
.is_SGI
== search_tbl
->is_SGI
)) {
923 if (search_tbl
->expected_tpt
)
924 tpt
= search_tbl
->expected_tpt
[rs_index
];
927 if (info
->flags
& IEEE80211_TX_CTL_AMPDU
)
928 rs_collect_tx_data(search_win
, rs_index
, tpt
,
929 info
->status
.ampdu_ack_len
,
930 info
->status
.ampdu_ack_map
);
932 rs_collect_tx_data(search_win
, rs_index
, tpt
,
934 /* Else if type matches "current/active" table,
935 * add final tx status to "current/active" history */
936 } else if ((tbl_type
.lq_type
== curr_tbl
->lq_type
) &&
937 (tbl_type
.ant_type
== curr_tbl
->ant_type
) &&
938 (tbl_type
.is_SGI
== curr_tbl
->is_SGI
)) {
939 if (curr_tbl
->expected_tpt
)
940 tpt
= curr_tbl
->expected_tpt
[rs_index
];
943 if (info
->flags
& IEEE80211_TX_CTL_AMPDU
)
944 rs_collect_tx_data(window
, rs_index
, tpt
,
945 info
->status
.ampdu_ack_len
,
946 info
->status
.ampdu_ack_map
);
948 rs_collect_tx_data(window
, rs_index
, tpt
,
952 /* If not searching for new mode, increment success/failed counter
953 * ... these help determine when to start searching again */
954 if (lq_sta
->stay_in_tbl
) {
955 if (info
->flags
& IEEE80211_TX_CTL_AMPDU
) {
956 lq_sta
->total_success
+= info
->status
.ampdu_ack_map
;
957 lq_sta
->total_failed
+=
958 (info
->status
.ampdu_ack_len
- info
->status
.ampdu_ack_map
);
961 lq_sta
->total_success
++;
963 lq_sta
->total_failed
++;
967 /* See if there's a better rate or modulation mode to try. */
968 rs_rate_scale_perform(priv
, dev
, hdr
, sta
);
975 * Begin a period of staying with a selected modulation mode.
976 * Set "stay_in_tbl" flag to prevent any mode switches.
977 * Set frame tx success limits according to legacy vs. high-throughput,
978 * and reset overall (spanning all rates) tx success history statistics.
979 * These control how long we stay using same modulation mode before
980 * searching for a new mode.
982 static void rs_set_stay_in_table(struct iwl_priv
*priv
, u8 is_legacy
,
983 struct iwl_lq_sta
*lq_sta
)
985 IWL_DEBUG_RATE("we are staying in the same table\n");
986 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
988 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
989 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
990 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
992 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
993 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
994 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
996 lq_sta
->table_count
= 0;
997 lq_sta
->total_failed
= 0;
998 lq_sta
->total_success
= 0;
1002 * Find correct throughput table for given mode of modulation
1004 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1005 struct iwl_scale_tbl_info
*tbl
)
1007 if (is_legacy(tbl
->lq_type
)) {
1008 if (!is_a_band(tbl
->lq_type
))
1009 tbl
->expected_tpt
= expected_tpt_G
;
1011 tbl
->expected_tpt
= expected_tpt_A
;
1012 } else if (is_siso(tbl
->lq_type
)) {
1013 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1015 tbl
->expected_tpt
= expected_tpt_siso40MHzSGI
;
1017 tbl
->expected_tpt
= expected_tpt_siso40MHz
;
1018 else if (tbl
->is_SGI
)
1019 tbl
->expected_tpt
= expected_tpt_siso20MHzSGI
;
1021 tbl
->expected_tpt
= expected_tpt_siso20MHz
;
1023 } else if (is_mimo(tbl
->lq_type
)) { /* FIXME:need to separate mimo2/3 */
1024 if (tbl
->is_fat
&& !lq_sta
->is_dup
)
1026 tbl
->expected_tpt
= expected_tpt_mimo40MHzSGI
;
1028 tbl
->expected_tpt
= expected_tpt_mimo40MHz
;
1029 else if (tbl
->is_SGI
)
1030 tbl
->expected_tpt
= expected_tpt_mimo20MHzSGI
;
1032 tbl
->expected_tpt
= expected_tpt_mimo20MHz
;
1034 tbl
->expected_tpt
= expected_tpt_G
;
1038 * Find starting rate for new "search" high-throughput mode of modulation.
1039 * Goal is to find lowest expected rate (under perfect conditions) that is
1040 * above the current measured throughput of "active" mode, to give new mode
1041 * a fair chance to prove itself without too many challenges.
1043 * This gets called when transitioning to more aggressive modulation
1044 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1045 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1046 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1047 * bit rate will typically need to increase, but not if performance was bad.
1049 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1050 struct iwl_lq_sta
*lq_sta
,
1051 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1052 u16 rate_mask
, s8 index
)
1054 /* "active" values */
1055 struct iwl_scale_tbl_info
*active_tbl
=
1056 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1057 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1058 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1060 /* expected "search" throughput */
1061 s32
*tpt_tbl
= tbl
->expected_tpt
;
1063 s32 new_rate
, high
, low
, start_hi
;
1067 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1070 high_low
= rs_get_adjacent_rate(priv
, rate
, rate_mask
,
1073 low
= high_low
& 0xff;
1074 high
= (high_low
>> 8) & 0xff;
1077 * Lower the "search" bit rate, to give new "search" mode
1078 * approximately the same throughput as "active" if:
1080 * 1) "Active" mode has been working modestly well (but not
1081 * great), and expected "search" throughput (under perfect
1082 * conditions) at candidate rate is above the actual
1083 * measured "active" throughput (but less than expected
1084 * "active" throughput under perfect conditions).
1086 * 2) "Active" mode has been working perfectly or very well
1087 * and expected "search" throughput (under perfect
1088 * conditions) at candidate rate is above expected
1089 * "active" throughput (under perfect conditions).
1091 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1092 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1093 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1094 (tpt_tbl
[rate
] <= active_tpt
))) ||
1095 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1096 (tpt_tbl
[rate
] > active_tpt
))) {
1098 /* (2nd or later pass)
1099 * If we've already tried to raise the rate, and are
1100 * now trying to lower it, use the higher rate. */
1101 if (start_hi
!= IWL_RATE_INVALID
) {
1102 new_rate
= start_hi
;
1108 /* Loop again with lower rate */
1109 if (low
!= IWL_RATE_INVALID
)
1112 /* Lower rate not available, use the original */
1116 /* Else try to raise the "search" rate to match "active" */
1118 /* (2nd or later pass)
1119 * If we've already tried to lower the rate, and are
1120 * now trying to raise it, use the lower rate. */
1121 if (new_rate
!= IWL_RATE_INVALID
)
1124 /* Loop again with higher rate */
1125 else if (high
!= IWL_RATE_INVALID
) {
1129 /* Higher rate not available, use the original */
1140 * Set up search table for MIMO
1142 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1143 struct iwl_lq_sta
*lq_sta
,
1144 struct ieee80211_conf
*conf
,
1145 struct sta_info
*sta
,
1146 struct iwl_scale_tbl_info
*tbl
, int index
)
1150 s8 is_green
= lq_sta
->is_green
;
1152 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1153 !sta
->ht_info
.ht_supported
)
1156 if (priv
->current_ht_config
.tx_mimo_ps_mode
== IWL_MIMO_PS_STATIC
)
1159 /* Need both Tx chains/antennas to support MIMO */
1160 if (priv
->hw_params
.tx_chains_num
< 2)
1163 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1165 tbl
->lq_type
= LQ_MIMO2
;
1166 tbl
->is_dup
= lq_sta
->is_dup
;
1168 rate_mask
= lq_sta
->active_mimo2_rate
;
1170 if (priv
->current_ht_config
.supported_chan_width
1171 == IWL_CHANNEL_WIDTH_40MHZ
)
1176 /* FIXME: - don't toggle SGI here
1178 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1182 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1188 rs_set_expected_tpt_table(lq_sta
, tbl
);
1190 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1192 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate
, rate_mask
);
1194 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1195 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1199 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, rate
, is_green
);
1201 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1202 tbl
->current_rate
, is_green
);
1207 * Set up search table for SISO
1209 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1210 struct iwl_lq_sta
*lq_sta
,
1211 struct ieee80211_conf
*conf
,
1212 struct sta_info
*sta
,
1213 struct iwl_scale_tbl_info
*tbl
, int index
)
1216 u8 is_green
= lq_sta
->is_green
;
1219 if (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
) ||
1220 !sta
->ht_info
.ht_supported
)
1223 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1225 tbl
->is_dup
= lq_sta
->is_dup
;
1226 tbl
->lq_type
= LQ_SISO
;
1228 rate_mask
= lq_sta
->active_siso_rate
;
1230 if (priv
->current_ht_config
.supported_chan_width
1231 == IWL_CHANNEL_WIDTH_40MHZ
)
1236 /* FIXME: - don't toggle SGI here
1238 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1242 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1249 tbl
->is_SGI
= 0; /*11n spec: no SGI in SISO+Greenfield*/
1251 rs_set_expected_tpt_table(lq_sta
, tbl
);
1252 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1254 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1255 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1256 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1260 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, rate
, is_green
);
1261 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1262 tbl
->current_rate
, is_green
);
1267 * Try to switch to new modulation mode from legacy
1269 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1270 struct iwl_lq_sta
*lq_sta
,
1271 struct ieee80211_conf
*conf
,
1272 struct sta_info
*sta
,
1275 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1276 struct iwl_scale_tbl_info
*search_tbl
=
1277 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1278 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1279 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1280 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1281 u8 start_action
= tbl
->action
;
1282 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1286 switch (tbl
->action
) {
1287 case IWL_LEGACY_SWITCH_ANTENNA
:
1288 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1290 lq_sta
->action_counter
++;
1292 /* Don't change antenna if success has been great */
1293 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1296 /* Set up search table to try other antenna */
1297 memcpy(search_tbl
, tbl
, sz
);
1299 if (rs_toggle_antenna(valid_tx_ant
,
1300 &search_tbl
->current_rate
, search_tbl
)) {
1301 lq_sta
->search_better_tbl
= 1;
1305 case IWL_LEGACY_SWITCH_SISO
:
1306 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1308 /* Set up search table to try SISO */
1309 memcpy(search_tbl
, tbl
, sz
);
1310 search_tbl
->is_SGI
= 0;
1311 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1314 lq_sta
->search_better_tbl
= 1;
1315 lq_sta
->action_counter
= 0;
1320 case IWL_LEGACY_SWITCH_MIMO2
:
1321 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1323 /* Set up search table to try MIMO */
1324 memcpy(search_tbl
, tbl
, sz
);
1325 search_tbl
->is_SGI
= 0;
1326 search_tbl
->ant_type
= ANT_AB
;/*FIXME:RS*/
1327 /*FIXME:RS:need to check ant validity*/
1328 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1331 lq_sta
->search_better_tbl
= 1;
1332 lq_sta
->action_counter
= 0;
1338 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2
)
1339 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1341 if (tbl
->action
== start_action
)
1349 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO2
)
1350 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA
;
1356 * Try to switch to new modulation mode from SISO
1358 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1359 struct iwl_lq_sta
*lq_sta
,
1360 struct ieee80211_conf
*conf
,
1361 struct sta_info
*sta
, int index
)
1363 u8 is_green
= lq_sta
->is_green
;
1364 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1365 struct iwl_scale_tbl_info
*search_tbl
=
1366 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1367 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1368 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1369 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1370 u8 start_action
= tbl
->action
;
1371 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1375 lq_sta
->action_counter
++;
1376 switch (tbl
->action
) {
1377 case IWL_SISO_SWITCH_ANTENNA
:
1378 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1379 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1382 memcpy(search_tbl
, tbl
, sz
);
1383 if (rs_toggle_antenna(valid_tx_ant
,
1384 &search_tbl
->current_rate
, search_tbl
)) {
1385 lq_sta
->search_better_tbl
= 1;
1389 case IWL_SISO_SWITCH_MIMO2
:
1390 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1391 memcpy(search_tbl
, tbl
, sz
);
1392 search_tbl
->is_SGI
= 0;
1393 search_tbl
->ant_type
= ANT_AB
; /*FIXME:RS*/
1394 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1397 lq_sta
->search_better_tbl
= 1;
1401 case IWL_SISO_SWITCH_GI
:
1403 !(priv
->current_ht_config
.sgf
&
1407 !(priv
->current_ht_config
.sgf
&
1411 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1413 memcpy(search_tbl
, tbl
, sz
);
1418 IWL_ERROR("SGI was set in GF+SISO\n");
1420 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1421 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1423 s32 tpt
= lq_sta
->last_tpt
/ 100;
1424 if (tpt
>= search_tbl
->expected_tpt
[index
])
1427 search_tbl
->current_rate
= rate_n_flags_from_tbl(
1428 search_tbl
, index
, is_green
);
1429 lq_sta
->search_better_tbl
= 1;
1433 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1434 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1436 if (tbl
->action
== start_action
)
1443 if (tbl
->action
> IWL_SISO_SWITCH_GI
)
1444 tbl
->action
= IWL_SISO_SWITCH_ANTENNA
;
1449 * Try to switch to new modulation mode from MIMO
1451 static int rs_move_mimo_to_other(struct iwl_priv
*priv
,
1452 struct iwl_lq_sta
*lq_sta
,
1453 struct ieee80211_conf
*conf
,
1454 struct sta_info
*sta
, int index
)
1456 s8 is_green
= lq_sta
->is_green
;
1457 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1458 struct iwl_scale_tbl_info
*search_tbl
=
1459 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1460 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1461 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1462 u8 start_action
= tbl
->action
;
1463 /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1467 lq_sta
->action_counter
++;
1468 switch (tbl
->action
) {
1469 case IWL_MIMO_SWITCH_ANTENNA_A
:
1470 case IWL_MIMO_SWITCH_ANTENNA_B
:
1471 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1473 /* Set up new search table for SISO */
1474 memcpy(search_tbl
, tbl
, sz
);
1476 /*FIXME:RS:need to check ant validity + C*/
1477 if (tbl
->action
== IWL_MIMO_SWITCH_ANTENNA_A
)
1478 search_tbl
->ant_type
= ANT_A
;
1480 search_tbl
->ant_type
= ANT_B
;
1482 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1485 lq_sta
->search_better_tbl
= 1;
1490 case IWL_MIMO_SWITCH_GI
:
1492 !(priv
->current_ht_config
.sgf
&
1496 !(priv
->current_ht_config
.sgf
&
1500 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1502 /* Set up new search table for MIMO */
1503 memcpy(search_tbl
, tbl
, sz
);
1504 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1505 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1507 * If active table already uses the fastest possible
1508 * modulation (dual stream with short guard interval),
1509 * and it's working well, there's no need to look
1510 * for a better type of modulation!
1513 s32 tpt
= lq_sta
->last_tpt
/ 100;
1514 if (tpt
>= search_tbl
->expected_tpt
[index
])
1517 search_tbl
->current_rate
= rate_n_flags_from_tbl(
1518 search_tbl
, index
, is_green
);
1519 lq_sta
->search_better_tbl
= 1;
1524 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1525 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1527 if (tbl
->action
== start_action
)
1534 if (tbl
->action
> IWL_MIMO_SWITCH_GI
)
1535 tbl
->action
= IWL_MIMO_SWITCH_ANTENNA_A
;
1541 * Check whether we should continue using same modulation mode, or
1542 * begin search for a new mode, based on:
1543 * 1) # tx successes or failures while using this mode
1544 * 2) # times calling this function
1545 * 3) elapsed time in this mode (not used, for now)
1547 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
)
1549 struct iwl_scale_tbl_info
*tbl
;
1552 int flush_interval_passed
= 0;
1553 struct iwl_priv
*priv
;
1556 active_tbl
= lq_sta
->active_tbl
;
1558 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1560 /* If we've been disallowing search, see if we should now allow it */
1561 if (lq_sta
->stay_in_tbl
) {
1563 /* Elapsed time using current modulation mode */
1564 if (lq_sta
->flush_timer
)
1565 flush_interval_passed
=
1567 (unsigned long)(lq_sta
->flush_timer
+
1568 IWL_RATE_SCALE_FLUSH_INTVL
));
1571 * Check if we should allow search for new modulation mode.
1572 * If many frames have failed or succeeded, or we've used
1573 * this same modulation for a long time, allow search, and
1574 * reset history stats that keep track of whether we should
1575 * allow a new search. Also (below) reset all bitmaps and
1576 * stats in active history.
1578 if ((lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
1579 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
1580 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
1581 && (flush_interval_passed
))) {
1582 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1583 lq_sta
->total_failed
,
1584 lq_sta
->total_success
,
1585 flush_interval_passed
);
1587 /* Allow search for new mode */
1588 lq_sta
->stay_in_tbl
= 0; /* only place reset */
1589 lq_sta
->total_failed
= 0;
1590 lq_sta
->total_success
= 0;
1591 lq_sta
->flush_timer
= 0;
1594 * Else if we've used this modulation mode enough repetitions
1595 * (regardless of elapsed time or success/failure), reset
1596 * history bitmaps and rate-specific stats for all rates in
1600 lq_sta
->table_count
++;
1601 if (lq_sta
->table_count
>=
1602 lq_sta
->table_count_limit
) {
1603 lq_sta
->table_count
= 0;
1605 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1606 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1607 rs_rate_scale_clear_window(
1612 /* If transitioning to allow "search", reset all history
1613 * bitmaps and stats in active table (this will become the new
1614 * "search" table). */
1615 if (!lq_sta
->stay_in_tbl
) {
1616 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1617 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1623 * Do rate scaling and search for new modulation mode.
1625 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
1626 struct net_device
*dev
,
1627 struct ieee80211_hdr
*hdr
,
1628 struct sta_info
*sta
)
1630 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
1631 struct ieee80211_hw
*hw
= local_to_hw(local
);
1632 struct ieee80211_conf
*conf
= &hw
->conf
;
1633 int low
= IWL_RATE_INVALID
;
1634 int high
= IWL_RATE_INVALID
;
1637 struct iwl_rate_scale_data
*window
= NULL
;
1638 int current_tpt
= IWL_INVALID_VALUE
;
1639 int low_tpt
= IWL_INVALID_VALUE
;
1640 int high_tpt
= IWL_INVALID_VALUE
;
1642 s8 scale_action
= 0;
1646 struct iwl_lq_sta
*lq_sta
;
1647 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
1648 u16 rate_scale_index_msk
= 0;
1655 u8 tid
= MAX_TID_COUNT
;
1657 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1659 fc
= hdr
->frame_control
;
1660 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
)) {
1661 /* Send management frames and broadcast/multicast data using
1663 /* TODO: this could probably be improved.. */
1667 if (!sta
|| !sta
->rate_ctrl_priv
)
1670 lq_sta
= (struct iwl_lq_sta
*)sta
->rate_ctrl_priv
;
1672 tid
= rs_tl_add_packet(lq_sta
, hdr
);
1675 * Select rate-scale / modulation-mode table to work with in
1676 * the rest of this function: "search" if searching for better
1677 * modulation mode, or "active" if doing rate scaling within a mode.
1679 if (!lq_sta
->search_better_tbl
)
1680 active_tbl
= lq_sta
->active_tbl
;
1682 active_tbl
= 1 - lq_sta
->active_tbl
;
1684 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1685 is_green
= lq_sta
->is_green
;
1687 /* current tx rate */
1688 index
= sta
->last_txrate_idx
;
1690 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index
,
1693 /* rates available for this association, and for modulation mode */
1694 rate_mask
= rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
);
1696 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask
);
1698 /* mask with station rate restriction */
1699 if (is_legacy(tbl
->lq_type
)) {
1700 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
1701 /* supp_rates has no CCK bits in A mode */
1702 rate_scale_index_msk
= (u16
) (rate_mask
&
1703 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
1705 rate_scale_index_msk
= (u16
) (rate_mask
&
1706 lq_sta
->supp_rates
);
1709 rate_scale_index_msk
= rate_mask
;
1711 if (!rate_scale_index_msk
)
1712 rate_scale_index_msk
= rate_mask
;
1714 if (!((1 << index
) & rate_scale_index_msk
)) {
1715 IWL_ERROR("Current Rate is not valid\n");
1719 /* Get expected throughput table and history window for current rate */
1720 if (!tbl
->expected_tpt
) {
1721 IWL_ERROR("tbl->expected_tpt is NULL\n");
1725 window
= &(tbl
->win
[index
]);
1728 * If there is not enough history to calculate actual average
1729 * throughput, keep analyzing results of more tx frames, without
1730 * changing rate or mode (bypass most of the rest of this function).
1731 * Set up new rate table in uCode only if old rate is not supported
1732 * in current association (use new rate found above).
1734 fail_count
= window
->counter
- window
->success_counter
;
1735 if ((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
1736 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
)) {
1737 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1739 window
->success_counter
, window
->counter
, index
);
1741 /* Can't calculate this yet; not enough history */
1742 window
->average_tpt
= IWL_INVALID_VALUE
;
1744 /* Should we stay with this modulation mode,
1745 * or search for a new one? */
1746 rs_stay_in_table(lq_sta
);
1750 /* Else we have enough samples; calculate estimate of
1751 * actual average throughput */
1753 /*FIXME:RS remove this else if we don't get this error*/
1754 if (window
->average_tpt
!= ((window
->success_ratio
*
1755 tbl
->expected_tpt
[index
] + 64) / 128)) {
1756 IWL_ERROR("expected_tpt should have been calculated"
1758 window
->average_tpt
= ((window
->success_ratio
*
1759 tbl
->expected_tpt
[index
] + 64) / 128);
1763 /* If we are searching for better modulation mode, check success. */
1764 if (lq_sta
->search_better_tbl
) {
1766 /* If good success, continue using the "search" mode;
1767 * no need to send new link quality command, since we're
1768 * continuing to use the setup that we've been trying. */
1769 if (window
->average_tpt
> lq_sta
->last_tpt
) {
1771 IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1772 "suc=%d cur-tpt=%d old-tpt=%d\n",
1773 window
->success_ratio
,
1774 window
->average_tpt
,
1777 if (!is_legacy(tbl
->lq_type
))
1778 lq_sta
->enable_counter
= 1;
1780 /* Swap tables; "search" becomes "active" */
1781 lq_sta
->active_tbl
= active_tbl
;
1782 current_tpt
= window
->average_tpt
;
1784 /* Else poor success; go back to mode in "active" table */
1787 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1788 "suc=%d cur-tpt=%d old-tpt=%d\n",
1789 window
->success_ratio
,
1790 window
->average_tpt
,
1793 /* Nullify "search" table */
1794 tbl
->lq_type
= LQ_NONE
;
1796 /* Revert to "active" table */
1797 active_tbl
= lq_sta
->active_tbl
;
1798 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
1800 /* Revert to "active" rate and throughput info */
1801 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
1802 current_tpt
= lq_sta
->last_tpt
;
1804 /* Need to set up a new rate table in uCode */
1808 /* Either way, we've made a decision; modulation mode
1809 * search is done, allow rate adjustment next time. */
1810 lq_sta
->search_better_tbl
= 0;
1811 done_search
= 1; /* Don't switch modes below! */
1815 /* (Else) not in search of better modulation mode, try for better
1816 * starting rate, while staying in this mode. */
1817 high_low
= rs_get_adjacent_rate(priv
, index
, rate_scale_index_msk
,
1819 low
= high_low
& 0xff;
1820 high
= (high_low
>> 8) & 0xff;
1822 sr
= window
->success_ratio
;
1824 /* Collect measured throughputs for current and adjacent rates */
1825 current_tpt
= window
->average_tpt
;
1826 if (low
!= IWL_RATE_INVALID
)
1827 low_tpt
= tbl
->win
[low
].average_tpt
;
1828 if (high
!= IWL_RATE_INVALID
)
1829 high_tpt
= tbl
->win
[high
].average_tpt
;
1833 /* Too many failures, decrease rate */
1834 if ((sr
<= IWL_RATE_DECREASE_TH
) || (current_tpt
== 0)) {
1835 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1838 /* No throughput measured yet for adjacent rates; try increase. */
1839 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
1840 (high_tpt
== IWL_INVALID_VALUE
)) {
1842 if (high
!= IWL_RATE_INVALID
&& sr
>= IWL_RATE_INCREASE_TH
)
1844 else if (low
!= IWL_RATE_INVALID
)
1848 /* Both adjacent throughputs are measured, but neither one has better
1849 * throughput; we're using the best rate, don't change it! */
1850 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
1851 (high_tpt
!= IWL_INVALID_VALUE
) &&
1852 (low_tpt
< current_tpt
) &&
1853 (high_tpt
< current_tpt
))
1856 /* At least one adjacent rate's throughput is measured,
1857 * and may have better performance. */
1859 /* Higher adjacent rate's throughput is measured */
1860 if (high_tpt
!= IWL_INVALID_VALUE
) {
1861 /* Higher rate has better throughput */
1862 if (high_tpt
> current_tpt
&&
1863 sr
>= IWL_RATE_INCREASE_TH
) {
1867 ("decrease rate because of high tpt\n");
1871 /* Lower adjacent rate's throughput is measured */
1872 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
1873 /* Lower rate has better throughput */
1874 if (low_tpt
> current_tpt
) {
1876 ("decrease rate because of low tpt\n");
1878 } else if (sr
>= IWL_RATE_INCREASE_TH
) {
1884 /* Sanity check; asked for decrease, but success rate or throughput
1885 * has been good at old rate. Don't change it. */
1886 if ((scale_action
== -1) && (low
!= IWL_RATE_INVALID
) &&
1887 ((sr
> IWL_RATE_HIGH_TH
) ||
1888 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
1891 switch (scale_action
) {
1893 /* Decrease starting rate, update uCode's rate table */
1894 if (low
!= IWL_RATE_INVALID
) {
1900 /* Increase starting rate, update uCode's rate table */
1901 if (high
!= IWL_RATE_INVALID
) {
1913 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1914 "high %d type %d\n",
1915 index
, scale_action
, low
, high
, tbl
->lq_type
);
1918 /* Replace uCode's rate table for the destination station. */
1920 rate
= rate_n_flags_from_tbl(tbl
, index
, is_green
);
1921 rs_fill_link_cmd(priv
, lq_sta
, rate
);
1922 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1925 /* Should we stay with this modulation mode, or search for a new one? */
1926 rs_stay_in_table(lq_sta
);
1929 * Search for new modulation mode if we're:
1930 * 1) Not changing rates right now
1931 * 2) Not just finishing up a search
1932 * 3) Allowing a new search
1934 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
&& window
->counter
) {
1935 /* Save current throughput to compare with "search" throughput*/
1936 lq_sta
->last_tpt
= current_tpt
;
1938 /* Select a new "search" modulation mode to try.
1939 * If one is found, set up the new "search" table. */
1940 if (is_legacy(tbl
->lq_type
))
1941 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
1942 else if (is_siso(tbl
->lq_type
))
1943 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
1945 rs_move_mimo_to_other(priv
, lq_sta
, conf
, sta
, index
);
1947 /* If new "search" mode was selected, set up in uCode table */
1948 if (lq_sta
->search_better_tbl
) {
1949 /* Access the "search" table, clear its history. */
1950 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1951 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
1952 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
1954 /* Use new "search" start rate */
1955 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
1957 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1958 tbl
->current_rate
, index
);
1959 rs_fill_link_cmd(priv
, lq_sta
, tbl
->current_rate
);
1960 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
1963 /* If the "active" (non-search) mode was legacy,
1964 * and we've tried switching antennas,
1965 * but we haven't been able to try HT modes (not available),
1966 * stay with best antenna legacy modulation for a while
1967 * before next round of mode comparisons. */
1968 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1969 if (is_legacy(tbl1
->lq_type
) &&
1970 (!(conf
->flags
& IEEE80211_CONF_SUPPORT_HT_MODE
)) &&
1971 (lq_sta
->action_counter
>= 1)) {
1972 lq_sta
->action_counter
= 0;
1973 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
1974 rs_set_stay_in_table(priv
, 1, lq_sta
);
1977 /* If we're in an HT mode, and all 3 mode switch actions
1978 * have been tried and compared, stay in this best modulation
1979 * mode for a while before next round of mode comparisons. */
1980 if (lq_sta
->enable_counter
&&
1981 (lq_sta
->action_counter
>= IWL_ACTION_LIMIT
)) {
1982 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
1983 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
1984 (tid
!= MAX_TID_COUNT
)) {
1985 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid
);
1986 rs_tl_turn_on_agg(priv
, tid
, lq_sta
, sta
);
1988 lq_sta
->action_counter
= 0;
1989 rs_set_stay_in_table(priv
, 0, lq_sta
);
1993 * Else, don't search for a new modulation mode.
1994 * Put new timestamp in stay-in-modulation-mode flush timer if:
1995 * 1) Not changing rates right now
1996 * 2) Not just finishing up a search
1997 * 3) flush timer is empty
2000 if ((!update_lq
) && (!done_search
) && (!lq_sta
->flush_timer
))
2001 lq_sta
->flush_timer
= jiffies
;
2005 tbl
->current_rate
= rate_n_flags_from_tbl(tbl
, index
, is_green
);
2007 sta
->last_txrate_idx
= i
;
2009 /* sta->txrate_idx is an index to A mode rates which start
2010 * at IWL_FIRST_OFDM_RATE
2012 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2013 sta
->txrate_idx
= i
- IWL_FIRST_OFDM_RATE
;
2015 sta
->txrate_idx
= i
;
2021 static void rs_initialize_lq(struct iwl_priv
*priv
,
2022 struct ieee80211_conf
*conf
,
2023 struct sta_info
*sta
)
2025 struct iwl_lq_sta
*lq_sta
;
2026 struct iwl_scale_tbl_info
*tbl
;
2030 u8 use_green
= rs_use_green(priv
, conf
);
2034 if (!sta
|| !sta
->rate_ctrl_priv
)
2037 lq_sta
= (struct iwl_lq_sta
*)sta
->rate_ctrl_priv
;
2038 i
= sta
->last_txrate_idx
;
2040 if ((lq_sta
->lq
.sta_id
== 0xff) &&
2041 (priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
))
2044 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2046 if (!lq_sta
->search_better_tbl
)
2047 active_tbl
= lq_sta
->active_tbl
;
2049 active_tbl
= 1 - lq_sta
->active_tbl
;
2051 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2053 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2056 /* FIXME:RS: This is also wrong in 4965 */
2057 rate
= iwl_rates
[i
].plcp
;
2058 rate
|= RATE_MCS_ANT_B_MSK
;
2059 rate
&= ~RATE_MCS_ANT_A_MSK
;
2061 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2062 rate
|= RATE_MCS_CCK_MSK
;
2064 tbl
->ant_type
= ANT_B
;
2065 rs_get_tbl_info_from_mcs(rate
, priv
->band
, tbl
, &rate_idx
);
2066 if (!rs_is_valid_ant(valid_tx_ant
, tbl
->ant_type
))
2067 rs_toggle_antenna(valid_tx_ant
, &rate
, tbl
);
2069 rate
= rate_n_flags_from_tbl(tbl
, rate_idx
, use_green
);
2070 tbl
->current_rate
= rate
;
2071 rs_set_expected_tpt_table(lq_sta
, tbl
);
2072 rs_fill_link_cmd(NULL
, lq_sta
, rate
);
2073 iwl_send_lq_cmd(priv
, &lq_sta
->lq
, CMD_ASYNC
);
2078 static void rs_get_rate(void *priv_rate
, struct net_device
*dev
,
2079 struct ieee80211_supported_band
*sband
,
2080 struct sk_buff
*skb
,
2081 struct rate_selection
*sel
)
2085 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
2086 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2087 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2088 struct sta_info
*sta
;
2090 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
2091 struct iwl_lq_sta
*lq_sta
;
2093 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2097 sta
= sta_info_get(local
, hdr
->addr1
);
2099 /* Send management frames and broadcast/multicast data using lowest
2101 fc
= hdr
->frame_control
;
2102 if (!ieee80211_is_data(fc
) || is_multicast_ether_addr(hdr
->addr1
) ||
2103 !sta
|| !sta
->rate_ctrl_priv
) {
2104 sel
->rate_idx
= rate_lowest_index(local
, sband
, sta
);
2108 lq_sta
= (struct iwl_lq_sta
*)sta
->rate_ctrl_priv
;
2109 i
= sta
->last_txrate_idx
;
2111 if ((priv
->iw_mode
== IEEE80211_IF_TYPE_IBSS
) &&
2112 !lq_sta
->ibss_sta_added
) {
2113 u8 sta_id
= iwl_find_station(priv
, hdr
->addr1
);
2114 DECLARE_MAC_BUF(mac
);
2116 if (sta_id
== IWL_INVALID_STATION
) {
2117 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2118 print_mac(mac
, hdr
->addr1
));
2119 sta_id
= iwl_add_station_flags(priv
, hdr
->addr1
,
2120 0, CMD_ASYNC
, NULL
);
2122 if ((sta_id
!= IWL_INVALID_STATION
)) {
2123 lq_sta
->lq
.sta_id
= sta_id
;
2124 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2125 lq_sta
->ibss_sta_added
= 1;
2126 rs_initialize_lq(priv
, conf
, sta
);
2130 if ((i
< 0) || (i
> IWL_RATE_COUNT
)) {
2131 sel
->rate_idx
= rate_lowest_index(local
, sband
, sta
);
2135 if (sband
->band
== IEEE80211_BAND_5GHZ
)
2136 i
-= IWL_FIRST_OFDM_RATE
;
2142 static void *rs_alloc_sta(void *priv_rate
, gfp_t gfp
)
2144 struct iwl_lq_sta
*lq_sta
;
2145 struct iwl_priv
*priv
;
2148 priv
= (struct iwl_priv
*)priv_rate
;
2149 IWL_DEBUG_RATE("create station rate scale window\n");
2151 lq_sta
= kzalloc(sizeof(struct iwl_lq_sta
), gfp
);
2155 lq_sta
->lq
.sta_id
= 0xff;
2158 for (j
= 0; j
< LQ_SIZE
; j
++)
2159 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2160 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2165 static void rs_rate_init(void *priv_rate
, void *priv_sta
,
2166 struct ieee80211_local
*local
,
2167 struct sta_info
*sta
)
2170 struct ieee80211_conf
*conf
= &local
->hw
.conf
;
2171 struct ieee80211_supported_band
*sband
;
2172 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_rate
;
2173 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2175 sband
= local
->hw
.wiphy
->bands
[local
->hw
.conf
.channel
->band
];
2177 lq_sta
->flush_timer
= 0;
2178 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2179 sta
->txrate_idx
= 3;
2180 for (j
= 0; j
< LQ_SIZE
; j
++)
2181 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2182 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2184 IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2185 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2186 * the lowest or the highest rate.. Could consider using RSSI from
2187 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2190 lq_sta
->ibss_sta_added
= 0;
2191 if (priv
->iw_mode
== IEEE80211_IF_TYPE_AP
) {
2192 u8 sta_id
= iwl_find_station(priv
, sta
->addr
);
2193 DECLARE_MAC_BUF(mac
);
2195 /* for IBSS the call are from tasklet */
2196 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2197 print_mac(mac
, sta
->addr
));
2199 if (sta_id
== IWL_INVALID_STATION
) {
2200 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2201 print_mac(mac
, sta
->addr
));
2202 sta_id
= iwl_add_station_flags(priv
, sta
->addr
,
2203 0, CMD_ASYNC
, NULL
);
2205 if ((sta_id
!= IWL_INVALID_STATION
)) {
2206 lq_sta
->lq
.sta_id
= sta_id
;
2207 lq_sta
->lq
.rs_table
[0].rate_n_flags
= 0;
2209 /* FIXME: this is w/a remove it later */
2210 priv
->assoc_station_added
= 1;
2213 /* Find highest tx rate supported by hardware and destination station */
2214 for (i
= 0; i
< sband
->n_bitrates
; i
++)
2215 if (sta
->supp_rates
[sband
->band
] & BIT(i
))
2216 sta
->txrate_idx
= i
;
2218 sta
->last_txrate_idx
= sta
->txrate_idx
;
2219 /* WTF is with this bogus comment? A doesn't have cck rates */
2220 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2221 if (local
->hw
.conf
.channel
->band
== IEEE80211_BAND_5GHZ
)
2222 sta
->last_txrate_idx
+= IWL_FIRST_OFDM_RATE
;
2225 lq_sta
->is_green
= rs_use_green(priv
, conf
);
2226 lq_sta
->active_legacy_rate
= priv
->active_rate
& ~(0x1000);
2227 lq_sta
->active_rate_basic
= priv
->active_rate_basic
;
2228 lq_sta
->band
= priv
->band
;
2230 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2231 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2233 lq_sta
->active_siso_rate
= conf
->ht_conf
.supp_mcs_set
[0] << 1;
2234 lq_sta
->active_siso_rate
|= conf
->ht_conf
.supp_mcs_set
[0] & 0x1;
2235 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2236 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2239 lq_sta
->active_mimo2_rate
= conf
->ht_conf
.supp_mcs_set
[1] << 1;
2240 lq_sta
->active_mimo2_rate
|= conf
->ht_conf
.supp_mcs_set
[1] & 0x1;
2241 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2242 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2244 lq_sta
->active_mimo3_rate
= conf
->ht_conf
.supp_mcs_set
[2] << 1;
2245 lq_sta
->active_mimo3_rate
|= conf
->ht_conf
.supp_mcs_set
[2] & 0x1;
2246 lq_sta
->active_mimo3_rate
&= ~((u16
)0x2);
2247 lq_sta
->active_mimo3_rate
<<= IWL_FIRST_OFDM_RATE
;
2249 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2250 lq_sta
->active_siso_rate
,
2251 lq_sta
->active_mimo2_rate
,
2252 lq_sta
->active_mimo3_rate
);
2254 /* These values will be overriden later */
2255 lq_sta
->lq
.general_params
.single_stream_ant_msk
= ANT_A
;
2256 lq_sta
->lq
.general_params
.dual_stream_ant_msk
= ANT_AB
;
2258 /* as default allow aggregation for all tids */
2259 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2262 rs_initialize_lq(priv
, conf
, sta
);
2265 static void rs_fill_link_cmd(const struct iwl_priv
*priv
,
2266 struct iwl_lq_sta
*lq_sta
, u32 new_rate
)
2268 struct iwl_scale_tbl_info tbl_type
;
2271 int repeat_rate
= 0;
2272 u8 ant_toggle_cnt
= 0;
2273 u8 use_ht_possible
= 1;
2274 u8 valid_tx_ant
= 0;
2275 struct iwl_link_quality_cmd
*lq_cmd
= &lq_sta
->lq
;
2277 /* Override starting rate (index 0) if needed for debug purposes */
2278 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2280 /* Interpret new_rate (rate_n_flags) */
2281 memset(&tbl_type
, 0, sizeof(tbl_type
));
2282 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
,
2283 &tbl_type
, &rate_idx
);
2285 /* How many times should we repeat the initial rate? */
2286 if (is_legacy(tbl_type
.lq_type
)) {
2288 repeat_rate
= IWL_NUMBER_TRY
;
2290 repeat_rate
= IWL_HT_NUMBER_TRY
;
2293 lq_cmd
->general_params
.mimo_delimiter
=
2294 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2296 /* Fill 1st table entry (index 0) */
2297 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2299 if (num_of_ant(tbl_type
.ant_type
) == 1) {
2300 lq_cmd
->general_params
.single_stream_ant_msk
=
2302 } else if (num_of_ant(tbl_type
.ant_type
) == 2) {
2303 lq_cmd
->general_params
.dual_stream_ant_msk
=
2305 } /* otherwise we don't modify the existing value */
2311 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2313 /* Fill rest of rate table */
2314 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2315 /* Repeat initial/next rate.
2316 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2317 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2318 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2319 if (is_legacy(tbl_type
.lq_type
)) {
2320 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2323 rs_toggle_antenna(valid_tx_ant
,
2324 &new_rate
, &tbl_type
))
2328 /* Override next rate if needed for debug purposes */
2329 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2331 /* Fill next table entry */
2332 lq_cmd
->rs_table
[index
].rate_n_flags
=
2333 cpu_to_le32(new_rate
);
2338 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
, &tbl_type
,
2341 /* Indicate to uCode which entries might be MIMO.
2342 * If initial rate was MIMO, this will finally end up
2343 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2344 if (is_mimo(tbl_type
.lq_type
))
2345 lq_cmd
->general_params
.mimo_delimiter
= index
;
2348 new_rate
= rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
2351 /* How many times should we repeat the next rate? */
2352 if (is_legacy(tbl_type
.lq_type
)) {
2353 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2356 rs_toggle_antenna(valid_tx_ant
,
2357 &new_rate
, &tbl_type
))
2360 repeat_rate
= IWL_NUMBER_TRY
;
2362 repeat_rate
= IWL_HT_NUMBER_TRY
;
2365 /* Don't allow HT rates after next pass.
2366 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2367 use_ht_possible
= 0;
2369 /* Override next rate if needed for debug purposes */
2370 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2372 /* Fill next table entry */
2373 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2379 lq_cmd
->agg_params
.agg_frame_cnt_limit
= 64;
2380 lq_cmd
->agg_params
.agg_dis_start_th
= 3;
2381 lq_cmd
->agg_params
.agg_time_limit
= cpu_to_le16(4000);
2384 static void *rs_alloc(struct ieee80211_local
*local
)
2386 return local
->hw
.priv
;
2388 /* rate scale requires free function to be implemented */
2389 static void rs_free(void *priv_rate
)
2394 static void rs_clear(void *priv_rate
)
2396 #ifdef CONFIG_IWLWIFI_DEBUG
2397 struct iwl_priv
*priv
= (struct iwl_priv
*) priv_rate
;
2399 IWL_DEBUG_RATE("enter\n");
2401 /* TODO - add rate scale state reset */
2403 IWL_DEBUG_RATE("leave\n");
2404 #endif /* CONFIG_IWLWIFI_DEBUG */
2407 static void rs_free_sta(void *priv_rate
, void *priv_sta
)
2409 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2410 struct iwl_priv
*priv
;
2412 priv
= (struct iwl_priv
*)priv_rate
;
2413 IWL_DEBUG_RATE("enter\n");
2415 IWL_DEBUG_RATE("leave\n");
2419 #ifdef CONFIG_MAC80211_DEBUGFS
2420 static int open_file_generic(struct inode
*inode
, struct file
*file
)
2422 file
->private_data
= inode
->i_private
;
2425 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
2426 u32
*rate_n_flags
, int index
)
2428 struct iwl_priv
*priv
;
2431 if (lq_sta
->dbg_fixed_rate
) {
2433 *rate_n_flags
= lq_sta
->dbg_fixed_rate
;
2435 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2436 *rate_n_flags
= 0x800D;
2438 *rate_n_flags
= 0x820A;
2440 IWL_DEBUG_RATE("Fixed rate ON\n");
2442 IWL_DEBUG_RATE("Fixed rate OFF\n");
2446 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
2447 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2449 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2450 struct iwl_priv
*priv
;
2456 memset(buf
, 0, sizeof(buf
));
2457 buf_size
= min(count
, sizeof(buf
) - 1);
2458 if (copy_from_user(buf
, user_buf
, buf_size
))
2461 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
2462 lq_sta
->dbg_fixed_rate
= parsed_rate
;
2464 lq_sta
->dbg_fixed_rate
= 0;
2466 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
2467 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2468 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2469 lq_sta
->active_mimo3_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2471 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2472 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed_rate
);
2474 if (lq_sta
->dbg_fixed_rate
) {
2475 rs_fill_link_cmd(NULL
, lq_sta
, lq_sta
->dbg_fixed_rate
);
2476 iwl_send_lq_cmd(lq_sta
->drv
, &lq_sta
->lq
, CMD_ASYNC
);
2482 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
2483 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2489 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2491 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
2492 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
2493 lq_sta
->total_failed
, lq_sta
->total_success
,
2494 lq_sta
->active_legacy_rate
);
2495 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
2496 lq_sta
->dbg_fixed_rate
);
2497 desc
+= sprintf(buff
+desc
, "general:"
2498 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2499 lq_sta
->lq
.general_params
.flags
,
2500 lq_sta
->lq
.general_params
.mimo_delimiter
,
2501 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
2502 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
2504 desc
+= sprintf(buff
+desc
, "agg:"
2505 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2506 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
2507 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
2508 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
2510 desc
+= sprintf(buff
+desc
,
2511 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2512 lq_sta
->lq
.general_params
.start_rate_index
[0],
2513 lq_sta
->lq
.general_params
.start_rate_index
[1],
2514 lq_sta
->lq
.general_params
.start_rate_index
[2],
2515 lq_sta
->lq
.general_params
.start_rate_index
[3]);
2518 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++)
2519 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X\n",
2520 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
2522 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2525 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
2526 .write
= rs_sta_dbgfs_scale_table_write
,
2527 .read
= rs_sta_dbgfs_scale_table_read
,
2528 .open
= open_file_generic
,
2530 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
2531 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
2537 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
2538 for (i
= 0; i
< LQ_SIZE
; i
++) {
2539 desc
+= sprintf(buff
+desc
, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2541 lq_sta
->active_tbl
== i
?"*":"x",
2542 lq_sta
->lq_info
[i
].lq_type
,
2543 lq_sta
->lq_info
[i
].is_SGI
,
2544 lq_sta
->lq_info
[i
].is_fat
,
2545 lq_sta
->lq_info
[i
].is_dup
,
2546 lq_sta
->lq_info
[i
].current_rate
);
2547 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
2548 desc
+= sprintf(buff
+desc
,
2549 "counter=%d success=%d %%=%d\n",
2550 lq_sta
->lq_info
[i
].win
[j
].counter
,
2551 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
2552 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
2555 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
2558 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
2559 .read
= rs_sta_dbgfs_stats_table_read
,
2560 .open
= open_file_generic
,
2563 static void rs_add_debugfs(void *priv
, void *priv_sta
,
2566 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2567 lq_sta
->rs_sta_dbgfs_scale_table_file
=
2568 debugfs_create_file("rate_scale_table", 0600, dir
,
2569 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
2570 lq_sta
->rs_sta_dbgfs_stats_table_file
=
2571 debugfs_create_file("rate_stats_table", 0600, dir
,
2572 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
2573 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
2574 debugfs_create_u8("tx_agg_tid_enable", 0600, dir
,
2575 &lq_sta
->tx_agg_tid_en
);
2579 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
2581 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2582 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
2583 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
2584 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
2588 static struct rate_control_ops rs_ops
= {
2591 .tx_status
= rs_tx_status
,
2592 .get_rate
= rs_get_rate
,
2593 .rate_init
= rs_rate_init
,
2597 .alloc_sta
= rs_alloc_sta
,
2598 .free_sta
= rs_free_sta
,
2599 #ifdef CONFIG_MAC80211_DEBUGFS
2600 .add_sta_debugfs
= rs_add_debugfs
,
2601 .remove_sta_debugfs
= rs_remove_debugfs
,
2605 int iwlagn_rate_control_register(void)
2607 return ieee80211_rate_control_register(&rs_ops
);
2610 void iwlagn_rate_control_unregister(void)
2612 ieee80211_rate_control_unregister(&rs_ops
);