1 /******************************************************************************
3 * Copyright(c) 2005 - 2011 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 * Intel Linux Wireless <ilw@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/slab.h>
30 #include <linux/wireless.h>
31 #include <net/mac80211.h>
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
37 #include <linux/workqueue.h>
44 #define RS_NAME "iwl-agn-rs"
46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
54 /* max allowed rate miss before sync LQ cmd */
55 #define IWL_MISSED_RATE_MAX 15
56 /* max time to accum history 2 seconds */
57 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
59 static u8 rs_ht_to_legacy
[] = {
60 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
61 IWL_RATE_6M_INDEX
, IWL_RATE_6M_INDEX
,
63 IWL_RATE_6M_INDEX
, IWL_RATE_9M_INDEX
,
64 IWL_RATE_12M_INDEX
, IWL_RATE_18M_INDEX
,
65 IWL_RATE_24M_INDEX
, IWL_RATE_36M_INDEX
,
66 IWL_RATE_48M_INDEX
, IWL_RATE_54M_INDEX
69 static const u8 ant_toggle_lookup
[] = {
70 /*ANT_NONE -> */ ANT_NONE
,
73 /*ANT_AB -> */ ANT_BC
,
75 /*ANT_AC -> */ ANT_AB
,
76 /*ANT_BC -> */ ANT_AC
,
77 /*ANT_ABC -> */ ANT_ABC
,
80 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
81 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
82 IWL_RATE_SISO_##s##M_PLCP, \
83 IWL_RATE_MIMO2_##s##M_PLCP,\
84 IWL_RATE_MIMO3_##s##M_PLCP,\
85 IWL_RATE_##r##M_IEEE, \
86 IWL_RATE_##ip##M_INDEX, \
87 IWL_RATE_##in##M_INDEX, \
88 IWL_RATE_##rp##M_INDEX, \
89 IWL_RATE_##rn##M_INDEX, \
90 IWL_RATE_##pp##M_INDEX, \
91 IWL_RATE_##np##M_INDEX }
95 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
97 * If there isn't a valid next or previous rate then INV is used which
98 * maps to IWL_RATE_INVALID
101 const struct iwl_rate_info iwl_rates
[IWL_RATE_COUNT
] = {
102 IWL_DECLARE_RATE_INFO(1, INV
, INV
, 2, INV
, 2, INV
, 2), /* 1mbps */
103 IWL_DECLARE_RATE_INFO(2, INV
, 1, 5, 1, 5, 1, 5), /* 2mbps */
104 IWL_DECLARE_RATE_INFO(5, INV
, 2, 6, 2, 11, 2, 11), /*5.5mbps */
105 IWL_DECLARE_RATE_INFO(11, INV
, 9, 12, 9, 12, 5, 18), /* 11mbps */
106 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
107 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
108 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
109 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
110 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
111 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
112 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
113 IWL_DECLARE_RATE_INFO(54, 54, 48, INV
, 48, INV
, 48, INV
),/* 54mbps */
114 IWL_DECLARE_RATE_INFO(60, 60, 48, INV
, 48, INV
, 48, INV
),/* 60mbps */
115 /* FIXME:RS: ^^ should be INV (legacy) */
118 static inline u8
rs_extract_rate(u32 rate_n_flags
)
120 return (u8
)(rate_n_flags
& RATE_MCS_RATE_MSK
);
123 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags
)
128 if (rate_n_flags
& RATE_MCS_HT_MSK
) {
129 idx
= rs_extract_rate(rate_n_flags
);
131 if (idx
>= IWL_RATE_MIMO3_6M_PLCP
)
132 idx
= idx
- IWL_RATE_MIMO3_6M_PLCP
;
133 else if (idx
>= IWL_RATE_MIMO2_6M_PLCP
)
134 idx
= idx
- IWL_RATE_MIMO2_6M_PLCP
;
136 idx
+= IWL_FIRST_OFDM_RATE
;
137 /* skip 9M not supported in ht*/
138 if (idx
>= IWL_RATE_9M_INDEX
)
140 if ((idx
>= IWL_FIRST_OFDM_RATE
) && (idx
<= IWL_LAST_OFDM_RATE
))
143 /* legacy rate format, search for match in table */
145 for (idx
= 0; idx
< ARRAY_SIZE(iwl_rates
); idx
++)
146 if (iwl_rates
[idx
].plcp
==
147 rs_extract_rate(rate_n_flags
))
154 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
156 struct ieee80211_sta
*sta
,
157 struct iwl_lq_sta
*lq_sta
);
158 static void rs_fill_link_cmd(struct iwl_priv
*priv
,
159 struct iwl_lq_sta
*lq_sta
, u32 rate_n_flags
);
160 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
, bool force_search
);
163 #ifdef CONFIG_MAC80211_DEBUGFS
164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
165 u32
*rate_n_flags
, int index
);
167 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
168 u32
*rate_n_flags
, int index
)
173 * The following tables contain the expected throughput metrics for all rates
175 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
177 * where invalid entries are zeros.
179 * CCK rates are only valid in legacy table and will only be used in G
183 static s32 expected_tpt_legacy
[IWL_RATE_COUNT
] = {
184 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
187 static s32 expected_tpt_siso20MHz
[4][IWL_RATE_COUNT
] = {
188 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202}, /* Norm */
189 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210}, /* SGI */
190 {0, 0, 0, 0, 47, 0, 91, 133, 171, 242, 305, 334, 362}, /* AGG */
191 {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
194 static s32 expected_tpt_siso40MHz
[4][IWL_RATE_COUNT
] = {
195 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
196 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
197 {0, 0, 0, 0, 94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
198 {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
201 static s32 expected_tpt_mimo2_20MHz
[4][IWL_RATE_COUNT
] = {
202 {0, 0, 0, 0, 74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
203 {0, 0, 0, 0, 81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
204 {0, 0, 0, 0, 89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
205 {0, 0, 0, 0, 97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
208 static s32 expected_tpt_mimo2_40MHz
[4][IWL_RATE_COUNT
] = {
209 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
210 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
211 {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
212 {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
215 static s32 expected_tpt_mimo3_20MHz
[4][IWL_RATE_COUNT
] = {
216 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
217 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
218 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
219 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
222 static s32 expected_tpt_mimo3_40MHz
[4][IWL_RATE_COUNT
] = {
223 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
224 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
225 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
226 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
230 static const struct iwl_rate_mcs_info iwl_rate_mcs
[IWL_RATE_COUNT
] = {
239 { "24", "16QAM 1/2"},
240 { "36", "16QAM 3/4"},
241 { "48", "64QAM 2/3"},
242 { "54", "64QAM 3/4"},
243 { "60", "64QAM 5/6"},
246 #define MCS_INDEX_PER_STREAM (8)
248 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data
*window
)
251 window
->success_counter
= 0;
252 window
->success_ratio
= IWL_INVALID_VALUE
;
254 window
->average_tpt
= IWL_INVALID_VALUE
;
258 static inline u8
rs_is_valid_ant(u8 valid_antenna
, u8 ant_type
)
260 return (ant_type
& valid_antenna
) == ant_type
;
264 * removes the old data from the statistics. All data that is older than
265 * TID_MAX_TIME_DIFF, will be deleted.
267 static void rs_tl_rm_old_stats(struct iwl_traffic_load
*tl
, u32 curr_time
)
269 /* The oldest age we want to keep */
270 u32 oldest_time
= curr_time
- TID_MAX_TIME_DIFF
;
272 while (tl
->queue_count
&&
273 (tl
->time_stamp
< oldest_time
)) {
274 tl
->total
-= tl
->packet_count
[tl
->head
];
275 tl
->packet_count
[tl
->head
] = 0;
276 tl
->time_stamp
+= TID_QUEUE_CELL_SPACING
;
279 if (tl
->head
>= TID_QUEUE_MAX_SIZE
)
285 * increment traffic load value for tid and also remove
286 * any old values if passed the certain time period
288 static u8
rs_tl_add_packet(struct iwl_lq_sta
*lq_data
,
289 struct ieee80211_hdr
*hdr
)
291 u32 curr_time
= jiffies_to_msecs(jiffies
);
294 struct iwl_traffic_load
*tl
= NULL
;
297 if (ieee80211_is_data_qos(hdr
->frame_control
)) {
298 u8
*qc
= ieee80211_get_qos_ctl(hdr
);
301 return MAX_TID_COUNT
;
303 if (unlikely(tid
>= TID_MAX_LOAD_COUNT
))
304 return MAX_TID_COUNT
;
306 tl
= &lq_data
->load
[tid
];
308 curr_time
-= curr_time
% TID_ROUND_VALUE
;
310 /* Happens only for the first packet. Initialize the data */
311 if (!(tl
->queue_count
)) {
313 tl
->time_stamp
= curr_time
;
316 tl
->packet_count
[0] = 1;
317 return MAX_TID_COUNT
;
320 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
321 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
323 /* The history is too long: remove data that is older than */
324 /* TID_MAX_TIME_DIFF */
325 if (index
>= TID_QUEUE_MAX_SIZE
)
326 rs_tl_rm_old_stats(tl
, curr_time
);
328 index
= (tl
->head
+ index
) % TID_QUEUE_MAX_SIZE
;
329 tl
->packet_count
[index
] = tl
->packet_count
[index
] + 1;
330 tl
->total
= tl
->total
+ 1;
332 if ((index
+ 1) > tl
->queue_count
)
333 tl
->queue_count
= index
+ 1;
338 #ifdef CONFIG_MAC80211_DEBUGFS
340 * Program the device to use fixed rate for frame transmit
341 * This is for debugging/testing only
342 * once the device start use fixed rate, we need to reload the module
343 * to being back the normal operation.
345 static void rs_program_fix_rate(struct iwl_priv
*priv
,
346 struct iwl_lq_sta
*lq_sta
)
348 struct iwl_station_priv
*sta_priv
=
349 container_of(lq_sta
, struct iwl_station_priv
, lq_sta
);
350 struct iwl_rxon_context
*ctx
= sta_priv
->common
.ctx
;
352 lq_sta
->active_legacy_rate
= 0x0FFF; /* 1 - 54 MBits, includes CCK */
353 lq_sta
->active_siso_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
354 lq_sta
->active_mimo2_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
355 lq_sta
->active_mimo3_rate
= 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
357 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
358 /* testmode has higher priority to overwirte the fixed rate */
359 if (priv
->tm_fixed_rate
)
360 lq_sta
->dbg_fixed_rate
= priv
->tm_fixed_rate
;
363 IWL_DEBUG_RATE(priv
, "sta_id %d rate 0x%X\n",
364 lq_sta
->lq
.sta_id
, lq_sta
->dbg_fixed_rate
);
366 if (lq_sta
->dbg_fixed_rate
) {
367 rs_fill_link_cmd(NULL
, lq_sta
, lq_sta
->dbg_fixed_rate
);
368 iwl_send_lq_cmd(lq_sta
->drv
, ctx
, &lq_sta
->lq
, CMD_ASYNC
,
375 get the traffic load value for tid
377 static u32
rs_tl_get_load(struct iwl_lq_sta
*lq_data
, u8 tid
)
379 u32 curr_time
= jiffies_to_msecs(jiffies
);
382 struct iwl_traffic_load
*tl
= NULL
;
384 if (tid
>= TID_MAX_LOAD_COUNT
)
387 tl
= &(lq_data
->load
[tid
]);
389 curr_time
-= curr_time
% TID_ROUND_VALUE
;
391 if (!(tl
->queue_count
))
394 time_diff
= TIME_WRAP_AROUND(tl
->time_stamp
, curr_time
);
395 index
= time_diff
/ TID_QUEUE_CELL_SPACING
;
397 /* The history is too long: remove data that is older than */
398 /* TID_MAX_TIME_DIFF */
399 if (index
>= TID_QUEUE_MAX_SIZE
)
400 rs_tl_rm_old_stats(tl
, curr_time
);
405 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv
*priv
,
406 struct iwl_lq_sta
*lq_data
, u8 tid
,
407 struct ieee80211_sta
*sta
)
413 * Don't create TX aggregation sessions when in high
414 * BT traffic, as they would just be disrupted by BT.
416 if (priv
->bt_traffic_load
>= IWL_BT_COEX_TRAFFIC_LOAD_HIGH
) {
417 IWL_ERR(priv
, "BT traffic (%d), no aggregation allowed\n",
418 priv
->bt_traffic_load
);
422 load
= rs_tl_get_load(lq_data
, tid
);
424 if (load
> IWL_AGG_LOAD_THRESHOLD
) {
425 IWL_DEBUG_HT(priv
, "Starting Tx agg: STA: %pM tid: %d\n",
427 ret
= ieee80211_start_tx_ba_session(sta
, tid
, 5000);
428 if (ret
== -EAGAIN
) {
430 * driver and mac80211 is out of sync
431 * this might be cause by reloading firmware
432 * stop the tx ba session here
434 IWL_ERR(priv
, "Fail start Tx agg on tid: %d\n",
436 ieee80211_stop_tx_ba_session(sta
, tid
);
439 IWL_DEBUG_HT(priv
, "Aggregation not enabled for tid %d "
440 "because load = %u\n", tid
, load
);
445 static void rs_tl_turn_on_agg(struct iwl_priv
*priv
, u8 tid
,
446 struct iwl_lq_sta
*lq_data
,
447 struct ieee80211_sta
*sta
)
449 if (tid
< TID_MAX_LOAD_COUNT
)
450 rs_tl_turn_on_agg_for_tid(priv
, lq_data
, tid
, sta
);
452 IWL_ERR(priv
, "tid exceeds max load count: %d/%d\n",
453 tid
, TID_MAX_LOAD_COUNT
);
456 static inline int get_num_of_ant_from_rate(u32 rate_n_flags
)
458 return !!(rate_n_flags
& RATE_MCS_ANT_A_MSK
) +
459 !!(rate_n_flags
& RATE_MCS_ANT_B_MSK
) +
460 !!(rate_n_flags
& RATE_MCS_ANT_C_MSK
);
464 * Static function to get the expected throughput from an iwl_scale_tbl_info
465 * that wraps a NULL pointer check
467 static s32
get_expected_tpt(struct iwl_scale_tbl_info
*tbl
, int rs_index
)
469 if (tbl
->expected_tpt
)
470 return tbl
->expected_tpt
[rs_index
];
475 * rs_collect_tx_data - Update the success/failure sliding window
477 * We keep a sliding window of the last 62 packets transmitted
478 * at this rate. window->data contains the bitmask of successful
481 static int rs_collect_tx_data(struct iwl_scale_tbl_info
*tbl
,
482 int scale_index
, int attempts
, int successes
)
484 struct iwl_rate_scale_data
*window
= NULL
;
485 static const u64 mask
= (((u64
)1) << (IWL_RATE_MAX_WINDOW
- 1));
488 if (scale_index
< 0 || scale_index
>= IWL_RATE_COUNT
)
491 /* Select window for current tx bit rate */
492 window
= &(tbl
->win
[scale_index
]);
494 /* Get expected throughput */
495 tpt
= get_expected_tpt(tbl
, scale_index
);
498 * Keep track of only the latest 62 tx frame attempts in this rate's
499 * history window; anything older isn't really relevant any more.
500 * If we have filled up the sliding window, drop the oldest attempt;
501 * if the oldest attempt (highest bit in bitmap) shows "success",
502 * subtract "1" from the success counter (this is the main reason
503 * we keep these bitmaps!).
505 while (attempts
> 0) {
506 if (window
->counter
>= IWL_RATE_MAX_WINDOW
) {
508 /* remove earliest */
509 window
->counter
= IWL_RATE_MAX_WINDOW
- 1;
511 if (window
->data
& mask
) {
512 window
->data
&= ~mask
;
513 window
->success_counter
--;
517 /* Increment frames-attempted counter */
520 /* Shift bitmap by one frame to throw away oldest history */
523 /* Mark the most recent #successes attempts as successful */
525 window
->success_counter
++;
533 /* Calculate current success ratio, avoid divide-by-0! */
534 if (window
->counter
> 0)
535 window
->success_ratio
= 128 * (100 * window
->success_counter
)
538 window
->success_ratio
= IWL_INVALID_VALUE
;
540 fail_count
= window
->counter
- window
->success_counter
;
542 /* Calculate average throughput, if we have enough history. */
543 if ((fail_count
>= IWL_RATE_MIN_FAILURE_TH
) ||
544 (window
->success_counter
>= IWL_RATE_MIN_SUCCESS_TH
))
545 window
->average_tpt
= (window
->success_ratio
* tpt
+ 64) / 128;
547 window
->average_tpt
= IWL_INVALID_VALUE
;
549 /* Tag this window as having been updated */
550 window
->stamp
= jiffies
;
556 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
558 /* FIXME:RS:remove this function and put the flags statically in the table */
559 static u32
rate_n_flags_from_tbl(struct iwl_priv
*priv
,
560 struct iwl_scale_tbl_info
*tbl
,
561 int index
, u8 use_green
)
563 u32 rate_n_flags
= 0;
565 if (is_legacy(tbl
->lq_type
)) {
566 rate_n_flags
= iwl_rates
[index
].plcp
;
567 if (index
>= IWL_FIRST_CCK_RATE
&& index
<= IWL_LAST_CCK_RATE
)
568 rate_n_flags
|= RATE_MCS_CCK_MSK
;
570 } else if (is_Ht(tbl
->lq_type
)) {
571 if (index
> IWL_LAST_OFDM_RATE
) {
572 IWL_ERR(priv
, "Invalid HT rate index %d\n", index
);
573 index
= IWL_LAST_OFDM_RATE
;
575 rate_n_flags
= RATE_MCS_HT_MSK
;
577 if (is_siso(tbl
->lq_type
))
578 rate_n_flags
|= iwl_rates
[index
].plcp_siso
;
579 else if (is_mimo2(tbl
->lq_type
))
580 rate_n_flags
|= iwl_rates
[index
].plcp_mimo2
;
582 rate_n_flags
|= iwl_rates
[index
].plcp_mimo3
;
584 IWL_ERR(priv
, "Invalid tbl->lq_type %d\n", tbl
->lq_type
);
587 rate_n_flags
|= ((tbl
->ant_type
<< RATE_MCS_ANT_POS
) &
588 RATE_MCS_ANT_ABC_MSK
);
590 if (is_Ht(tbl
->lq_type
)) {
593 rate_n_flags
|= RATE_MCS_DUP_MSK
;
595 rate_n_flags
|= RATE_MCS_HT40_MSK
;
598 rate_n_flags
|= RATE_MCS_SGI_MSK
;
601 rate_n_flags
|= RATE_MCS_GF_MSK
;
602 if (is_siso(tbl
->lq_type
) && tbl
->is_SGI
) {
603 rate_n_flags
&= ~RATE_MCS_SGI_MSK
;
604 IWL_ERR(priv
, "GF was set with SGI:SISO\n");
612 * Interpret uCode API's rate_n_flags format,
613 * fill "search" or "active" tx mode table.
615 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags
,
616 enum ieee80211_band band
,
617 struct iwl_scale_tbl_info
*tbl
,
620 u32 ant_msk
= (rate_n_flags
& RATE_MCS_ANT_ABC_MSK
);
621 u8 num_of_ant
= get_num_of_ant_from_rate(rate_n_flags
);
624 memset(tbl
, 0, sizeof(struct iwl_scale_tbl_info
));
625 *rate_idx
= iwl_hwrate_to_plcp_idx(rate_n_flags
);
627 if (*rate_idx
== IWL_RATE_INVALID
) {
631 tbl
->is_SGI
= 0; /* default legacy setup */
634 tbl
->ant_type
= (ant_msk
>> RATE_MCS_ANT_POS
);
635 tbl
->lq_type
= LQ_NONE
;
636 tbl
->max_search
= IWL_MAX_SEARCH
;
638 /* legacy rate format */
639 if (!(rate_n_flags
& RATE_MCS_HT_MSK
)) {
640 if (num_of_ant
== 1) {
641 if (band
== IEEE80211_BAND_5GHZ
)
648 if (rate_n_flags
& RATE_MCS_SGI_MSK
)
651 if ((rate_n_flags
& RATE_MCS_HT40_MSK
) ||
652 (rate_n_flags
& RATE_MCS_DUP_MSK
))
655 if (rate_n_flags
& RATE_MCS_DUP_MSK
)
658 mcs
= rs_extract_rate(rate_n_flags
);
661 if (mcs
<= IWL_RATE_SISO_60M_PLCP
) {
663 tbl
->lq_type
= LQ_SISO
; /*else NONE*/
665 } else if (mcs
<= IWL_RATE_MIMO2_60M_PLCP
) {
667 tbl
->lq_type
= LQ_MIMO2
;
670 if (num_of_ant
== 3) {
671 tbl
->max_search
= IWL_MAX_11N_MIMO3_SEARCH
;
672 tbl
->lq_type
= LQ_MIMO3
;
679 /* switch to another antenna/antennas and return 1 */
680 /* if no other valid antenna found, return 0 */
681 static int rs_toggle_antenna(u32 valid_ant
, u32
*rate_n_flags
,
682 struct iwl_scale_tbl_info
*tbl
)
686 if (!tbl
->ant_type
|| tbl
->ant_type
> ANT_ABC
)
689 if (!rs_is_valid_ant(valid_ant
, tbl
->ant_type
))
692 new_ant_type
= ant_toggle_lookup
[tbl
->ant_type
];
694 while ((new_ant_type
!= tbl
->ant_type
) &&
695 !rs_is_valid_ant(valid_ant
, new_ant_type
))
696 new_ant_type
= ant_toggle_lookup
[new_ant_type
];
698 if (new_ant_type
== tbl
->ant_type
)
701 tbl
->ant_type
= new_ant_type
;
702 *rate_n_flags
&= ~RATE_MCS_ANT_ABC_MSK
;
703 *rate_n_flags
|= new_ant_type
<< RATE_MCS_ANT_POS
;
708 * Green-field mode is valid if the station supports it and
709 * there are no non-GF stations present in the BSS.
711 static bool rs_use_green(struct ieee80211_sta
*sta
)
713 struct iwl_station_priv
*sta_priv
= (void *)sta
->drv_priv
;
714 struct iwl_rxon_context
*ctx
= sta_priv
->common
.ctx
;
716 return (sta
->ht_cap
.cap
& IEEE80211_HT_CAP_GRN_FLD
) &&
717 !(ctx
->ht
.non_gf_sta_present
);
721 * rs_get_supported_rates - get the available rates
723 * if management frame or broadcast frame only return
724 * basic available rates.
727 static u16
rs_get_supported_rates(struct iwl_lq_sta
*lq_sta
,
728 struct ieee80211_hdr
*hdr
,
729 enum iwl_table_type rate_type
)
731 if (is_legacy(rate_type
)) {
732 return lq_sta
->active_legacy_rate
;
734 if (is_siso(rate_type
))
735 return lq_sta
->active_siso_rate
;
736 else if (is_mimo2(rate_type
))
737 return lq_sta
->active_mimo2_rate
;
739 return lq_sta
->active_mimo3_rate
;
743 static u16
rs_get_adjacent_rate(struct iwl_priv
*priv
, u8 index
, u16 rate_mask
,
746 u8 high
= IWL_RATE_INVALID
;
747 u8 low
= IWL_RATE_INVALID
;
749 /* 802.11A or ht walks to the next literal adjacent rate in
751 if (is_a_band(rate_type
) || !is_legacy(rate_type
)) {
755 /* Find the previous rate that is in the rate mask */
757 for (mask
= (1 << i
); i
>= 0; i
--, mask
>>= 1) {
758 if (rate_mask
& mask
) {
764 /* Find the next rate that is in the rate mask */
766 for (mask
= (1 << i
); i
< IWL_RATE_COUNT
; i
++, mask
<<= 1) {
767 if (rate_mask
& mask
) {
773 return (high
<< 8) | low
;
777 while (low
!= IWL_RATE_INVALID
) {
778 low
= iwl_rates
[low
].prev_rs
;
779 if (low
== IWL_RATE_INVALID
)
781 if (rate_mask
& (1 << low
))
783 IWL_DEBUG_RATE(priv
, "Skipping masked lower rate: %d\n", low
);
787 while (high
!= IWL_RATE_INVALID
) {
788 high
= iwl_rates
[high
].next_rs
;
789 if (high
== IWL_RATE_INVALID
)
791 if (rate_mask
& (1 << high
))
793 IWL_DEBUG_RATE(priv
, "Skipping masked higher rate: %d\n", high
);
796 return (high
<< 8) | low
;
799 static u32
rs_get_lower_rate(struct iwl_lq_sta
*lq_sta
,
800 struct iwl_scale_tbl_info
*tbl
,
801 u8 scale_index
, u8 ht_possible
)
806 u8 switch_to_legacy
= 0;
807 u8 is_green
= lq_sta
->is_green
;
808 struct iwl_priv
*priv
= lq_sta
->drv
;
810 /* check if we need to switch from HT to legacy rates.
811 * assumption is that mandatory rates (1Mbps or 6Mbps)
812 * are always supported (spec demand) */
813 if (!is_legacy(tbl
->lq_type
) && (!ht_possible
|| !scale_index
)) {
814 switch_to_legacy
= 1;
815 scale_index
= rs_ht_to_legacy
[scale_index
];
816 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
821 if (num_of_ant(tbl
->ant_type
) > 1)
823 first_antenna(priv
->hw_params
.valid_tx_ant
);
827 tbl
->max_search
= IWL_MAX_SEARCH
;
830 rate_mask
= rs_get_supported_rates(lq_sta
, NULL
, tbl
->lq_type
);
832 /* Mask with station rate restriction */
833 if (is_legacy(tbl
->lq_type
)) {
834 /* supp_rates has no CCK bits in A mode */
835 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
836 rate_mask
= (u16
)(rate_mask
&
837 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
839 rate_mask
= (u16
)(rate_mask
& lq_sta
->supp_rates
);
842 /* If we switched from HT to legacy, check current rate */
843 if (switch_to_legacy
&& (rate_mask
& (1 << scale_index
))) {
848 high_low
= rs_get_adjacent_rate(lq_sta
->drv
, scale_index
, rate_mask
,
850 low
= high_low
& 0xff;
852 if (low
== IWL_RATE_INVALID
)
856 return rate_n_flags_from_tbl(lq_sta
->drv
, tbl
, low
, is_green
);
860 * Simple function to compare two rate scale table types
862 static bool table_type_matches(struct iwl_scale_tbl_info
*a
,
863 struct iwl_scale_tbl_info
*b
)
865 return (a
->lq_type
== b
->lq_type
) && (a
->ant_type
== b
->ant_type
) &&
866 (a
->is_SGI
== b
->is_SGI
);
869 static void rs_bt_update_lq(struct iwl_priv
*priv
, struct iwl_rxon_context
*ctx
,
870 struct iwl_lq_sta
*lq_sta
)
872 struct iwl_scale_tbl_info
*tbl
;
873 bool full_concurrent
= priv
->bt_full_concurrent
;
876 if (priv
->bt_ant_couple_ok
) {
878 * Is there a need to switch between
879 * full concurrency and 3-wire?
881 spin_lock_irqsave(&priv
->lock
, flags
);
882 if (priv
->bt_ci_compliance
&& priv
->bt_ant_couple_ok
)
883 full_concurrent
= true;
885 full_concurrent
= false;
886 spin_unlock_irqrestore(&priv
->lock
, flags
);
888 if ((priv
->bt_traffic_load
!= priv
->last_bt_traffic_load
) ||
889 (priv
->bt_full_concurrent
!= full_concurrent
)) {
890 priv
->bt_full_concurrent
= full_concurrent
;
892 /* Update uCode's rate table. */
893 tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
894 rs_fill_link_cmd(priv
, lq_sta
, tbl
->current_rate
);
895 iwl_send_lq_cmd(priv
, ctx
, &lq_sta
->lq
, CMD_ASYNC
, false);
897 queue_work(priv
->workqueue
, &priv
->bt_full_concurrency
);
902 * mac80211 sends us Tx status
904 static void rs_tx_status(void *priv_r
, struct ieee80211_supported_band
*sband
,
905 struct ieee80211_sta
*sta
, void *priv_sta
,
910 int rs_index
, mac_index
, i
;
911 struct iwl_lq_sta
*lq_sta
= priv_sta
;
912 struct iwl_link_quality_cmd
*table
;
913 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
914 struct iwl_priv
*priv
= (struct iwl_priv
*)priv_r
;
915 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
916 enum mac80211_rate_control_flags mac_flags
;
918 struct iwl_scale_tbl_info tbl_type
;
919 struct iwl_scale_tbl_info
*curr_tbl
, *other_tbl
, *tmp_tbl
;
920 struct iwl_station_priv
*sta_priv
= (void *)sta
->drv_priv
;
921 struct iwl_rxon_context
*ctx
= sta_priv
->common
.ctx
;
923 IWL_DEBUG_RATE_LIMIT(priv
, "get frame ack response, update rate scale window\n");
925 /* Treat uninitialized rate scaling data same as non-existing. */
927 IWL_DEBUG_RATE(priv
, "Station rate scaling not created yet.\n");
929 } else if (!lq_sta
->drv
) {
930 IWL_DEBUG_RATE(priv
, "Rate scaling not initialized yet.\n");
934 if (!ieee80211_is_data(hdr
->frame_control
) ||
935 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
938 /* This packet was aggregated but doesn't carry status info */
939 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) &&
940 !(info
->flags
& IEEE80211_TX_STAT_AMPDU
))
944 * Ignore this Tx frame response if its initial rate doesn't match
945 * that of latest Link Quality command. There may be stragglers
946 * from a previous Link Quality command, but we're no longer interested
947 * in those; they're either from the "active" mode while we're trying
948 * to check "search" mode, or a prior "search" mode after we've moved
949 * to a new "search" mode (which might become the new "active" mode).
952 tx_rate
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
953 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
, &rs_index
);
954 if (priv
->band
== IEEE80211_BAND_5GHZ
)
955 rs_index
-= IWL_FIRST_OFDM_RATE
;
956 mac_flags
= info
->status
.rates
[0].flags
;
957 mac_index
= info
->status
.rates
[0].idx
;
958 /* For HT packets, map MCS to PLCP */
959 if (mac_flags
& IEEE80211_TX_RC_MCS
) {
960 mac_index
&= RATE_MCS_CODE_MSK
; /* Remove # of streams */
961 if (mac_index
>= (IWL_RATE_9M_INDEX
- IWL_FIRST_OFDM_RATE
))
964 * mac80211 HT index is always zero-indexed; we need to move
965 * HT OFDM rates after CCK rates in 2.4 GHz band
967 if (priv
->band
== IEEE80211_BAND_2GHZ
)
968 mac_index
+= IWL_FIRST_OFDM_RATE
;
970 /* Here we actually compare this rate to the latest LQ command */
971 if ((mac_index
< 0) ||
972 (tbl_type
.is_SGI
!= !!(mac_flags
& IEEE80211_TX_RC_SHORT_GI
)) ||
973 (tbl_type
.is_ht40
!= !!(mac_flags
& IEEE80211_TX_RC_40_MHZ_WIDTH
)) ||
974 (tbl_type
.is_dup
!= !!(mac_flags
& IEEE80211_TX_RC_DUP_DATA
)) ||
975 (tbl_type
.ant_type
!= info
->antenna_sel_tx
) ||
976 (!!(tx_rate
& RATE_MCS_HT_MSK
) != !!(mac_flags
& IEEE80211_TX_RC_MCS
)) ||
977 (!!(tx_rate
& RATE_MCS_GF_MSK
) != !!(mac_flags
& IEEE80211_TX_RC_GREEN_FIELD
)) ||
978 (rs_index
!= mac_index
)) {
979 IWL_DEBUG_RATE(priv
, "initial rate %d does not match %d (0x%x)\n", mac_index
, rs_index
, tx_rate
);
981 * Since rates mis-match, the last LQ command may have failed.
982 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
985 lq_sta
->missed_rate_counter
++;
986 if (lq_sta
->missed_rate_counter
> IWL_MISSED_RATE_MAX
) {
987 lq_sta
->missed_rate_counter
= 0;
988 iwl_send_lq_cmd(priv
, ctx
, &lq_sta
->lq
, CMD_ASYNC
, false);
990 /* Regardless, ignore this status info for outdated rate */
993 /* Rate did match, so reset the missed_rate_counter */
994 lq_sta
->missed_rate_counter
= 0;
996 /* Figure out if rate scale algorithm is in active or search table */
997 if (table_type_matches(&tbl_type
,
998 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]))) {
999 curr_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1000 other_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1001 } else if (table_type_matches(&tbl_type
,
1002 &lq_sta
->lq_info
[1 - lq_sta
->active_tbl
])) {
1003 curr_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1004 other_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1006 IWL_DEBUG_RATE(priv
, "Neither active nor search matches tx rate\n");
1007 tmp_tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1008 IWL_DEBUG_RATE(priv
, "active- lq:%x, ant:%x, SGI:%d\n",
1009 tmp_tbl
->lq_type
, tmp_tbl
->ant_type
, tmp_tbl
->is_SGI
);
1010 tmp_tbl
= &(lq_sta
->lq_info
[1 - lq_sta
->active_tbl
]);
1011 IWL_DEBUG_RATE(priv
, "search- lq:%x, ant:%x, SGI:%d\n",
1012 tmp_tbl
->lq_type
, tmp_tbl
->ant_type
, tmp_tbl
->is_SGI
);
1013 IWL_DEBUG_RATE(priv
, "actual- lq:%x, ant:%x, SGI:%d\n",
1014 tbl_type
.lq_type
, tbl_type
.ant_type
, tbl_type
.is_SGI
);
1016 * no matching table found, let's by-pass the data collection
1017 * and continue to perform rate scale to find the rate table
1019 rs_stay_in_table(lq_sta
, true);
1024 * Updating the frame history depends on whether packets were
1027 * For aggregation, all packets were transmitted at the same rate, the
1028 * first index into rate scale table.
1030 if (info
->flags
& IEEE80211_TX_STAT_AMPDU
) {
1031 tx_rate
= le32_to_cpu(table
->rs_table
[0].rate_n_flags
);
1032 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
, &tbl_type
,
1034 rs_collect_tx_data(curr_tbl
, rs_index
,
1035 info
->status
.ampdu_len
,
1036 info
->status
.ampdu_ack_len
);
1038 /* Update success/fail counts if not searching for new mode */
1039 if (lq_sta
->stay_in_tbl
) {
1040 lq_sta
->total_success
+= info
->status
.ampdu_ack_len
;
1041 lq_sta
->total_failed
+= (info
->status
.ampdu_len
-
1042 info
->status
.ampdu_ack_len
);
1046 * For legacy, update frame history with for each Tx retry.
1048 retries
= info
->status
.rates
[0].count
- 1;
1049 /* HW doesn't send more than 15 retries */
1050 retries
= min(retries
, 15);
1052 /* The last transmission may have been successful */
1053 legacy_success
= !!(info
->flags
& IEEE80211_TX_STAT_ACK
);
1054 /* Collect data for each rate used during failed TX attempts */
1055 for (i
= 0; i
<= retries
; ++i
) {
1056 tx_rate
= le32_to_cpu(table
->rs_table
[i
].rate_n_flags
);
1057 rs_get_tbl_info_from_mcs(tx_rate
, priv
->band
,
1058 &tbl_type
, &rs_index
);
1060 * Only collect stats if retried rate is in the same RS
1061 * table as active/search.
1063 if (table_type_matches(&tbl_type
, curr_tbl
))
1065 else if (table_type_matches(&tbl_type
, other_tbl
))
1066 tmp_tbl
= other_tbl
;
1069 rs_collect_tx_data(tmp_tbl
, rs_index
, 1,
1070 i
< retries
? 0 : legacy_success
);
1073 /* Update success/fail counts if not searching for new mode */
1074 if (lq_sta
->stay_in_tbl
) {
1075 lq_sta
->total_success
+= legacy_success
;
1076 lq_sta
->total_failed
+= retries
+ (1 - legacy_success
);
1079 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1080 lq_sta
->last_rate_n_flags
= tx_rate
;
1082 /* See if there's a better rate or modulation mode to try. */
1083 if (sta
&& sta
->supp_rates
[sband
->band
])
1084 rs_rate_scale_perform(priv
, skb
, sta
, lq_sta
);
1086 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_SVTOOL)
1087 if ((priv
->tm_fixed_rate
) &&
1088 (priv
->tm_fixed_rate
!= lq_sta
->dbg_fixed_rate
))
1089 rs_program_fix_rate(priv
, lq_sta
);
1091 if (priv
->cfg
->bt_params
&& priv
->cfg
->bt_params
->advanced_bt_coexist
)
1092 rs_bt_update_lq(priv
, ctx
, lq_sta
);
1096 * Begin a period of staying with a selected modulation mode.
1097 * Set "stay_in_tbl" flag to prevent any mode switches.
1098 * Set frame tx success limits according to legacy vs. high-throughput,
1099 * and reset overall (spanning all rates) tx success history statistics.
1100 * These control how long we stay using same modulation mode before
1101 * searching for a new mode.
1103 static void rs_set_stay_in_table(struct iwl_priv
*priv
, u8 is_legacy
,
1104 struct iwl_lq_sta
*lq_sta
)
1106 IWL_DEBUG_RATE(priv
, "we are staying in the same table\n");
1107 lq_sta
->stay_in_tbl
= 1; /* only place this gets set */
1109 lq_sta
->table_count_limit
= IWL_LEGACY_TABLE_COUNT
;
1110 lq_sta
->max_failure_limit
= IWL_LEGACY_FAILURE_LIMIT
;
1111 lq_sta
->max_success_limit
= IWL_LEGACY_SUCCESS_LIMIT
;
1113 lq_sta
->table_count_limit
= IWL_NONE_LEGACY_TABLE_COUNT
;
1114 lq_sta
->max_failure_limit
= IWL_NONE_LEGACY_FAILURE_LIMIT
;
1115 lq_sta
->max_success_limit
= IWL_NONE_LEGACY_SUCCESS_LIMIT
;
1117 lq_sta
->table_count
= 0;
1118 lq_sta
->total_failed
= 0;
1119 lq_sta
->total_success
= 0;
1120 lq_sta
->flush_timer
= jiffies
;
1121 lq_sta
->action_counter
= 0;
1125 * Find correct throughput table for given mode of modulation
1127 static void rs_set_expected_tpt_table(struct iwl_lq_sta
*lq_sta
,
1128 struct iwl_scale_tbl_info
*tbl
)
1130 /* Used to choose among HT tables */
1131 s32 (*ht_tbl_pointer
)[IWL_RATE_COUNT
];
1133 /* Check for invalid LQ type */
1134 if (WARN_ON_ONCE(!is_legacy(tbl
->lq_type
) && !is_Ht(tbl
->lq_type
))) {
1135 tbl
->expected_tpt
= expected_tpt_legacy
;
1139 /* Legacy rates have only one table */
1140 if (is_legacy(tbl
->lq_type
)) {
1141 tbl
->expected_tpt
= expected_tpt_legacy
;
1145 /* Choose among many HT tables depending on number of streams
1146 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1148 if (is_siso(tbl
->lq_type
) && (!tbl
->is_ht40
|| lq_sta
->is_dup
))
1149 ht_tbl_pointer
= expected_tpt_siso20MHz
;
1150 else if (is_siso(tbl
->lq_type
))
1151 ht_tbl_pointer
= expected_tpt_siso40MHz
;
1152 else if (is_mimo2(tbl
->lq_type
) && (!tbl
->is_ht40
|| lq_sta
->is_dup
))
1153 ht_tbl_pointer
= expected_tpt_mimo2_20MHz
;
1154 else if (is_mimo2(tbl
->lq_type
))
1155 ht_tbl_pointer
= expected_tpt_mimo2_40MHz
;
1156 else if (is_mimo3(tbl
->lq_type
) && (!tbl
->is_ht40
|| lq_sta
->is_dup
))
1157 ht_tbl_pointer
= expected_tpt_mimo3_20MHz
;
1158 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1159 ht_tbl_pointer
= expected_tpt_mimo3_40MHz
;
1161 if (!tbl
->is_SGI
&& !lq_sta
->is_agg
) /* Normal */
1162 tbl
->expected_tpt
= ht_tbl_pointer
[0];
1163 else if (tbl
->is_SGI
&& !lq_sta
->is_agg
) /* SGI */
1164 tbl
->expected_tpt
= ht_tbl_pointer
[1];
1165 else if (!tbl
->is_SGI
&& lq_sta
->is_agg
) /* AGG */
1166 tbl
->expected_tpt
= ht_tbl_pointer
[2];
1168 tbl
->expected_tpt
= ht_tbl_pointer
[3];
1172 * Find starting rate for new "search" high-throughput mode of modulation.
1173 * Goal is to find lowest expected rate (under perfect conditions) that is
1174 * above the current measured throughput of "active" mode, to give new mode
1175 * a fair chance to prove itself without too many challenges.
1177 * This gets called when transitioning to more aggressive modulation
1178 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1179 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1180 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1181 * bit rate will typically need to increase, but not if performance was bad.
1183 static s32
rs_get_best_rate(struct iwl_priv
*priv
,
1184 struct iwl_lq_sta
*lq_sta
,
1185 struct iwl_scale_tbl_info
*tbl
, /* "search" */
1186 u16 rate_mask
, s8 index
)
1188 /* "active" values */
1189 struct iwl_scale_tbl_info
*active_tbl
=
1190 &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1191 s32 active_sr
= active_tbl
->win
[index
].success_ratio
;
1192 s32 active_tpt
= active_tbl
->expected_tpt
[index
];
1194 /* expected "search" throughput */
1195 s32
*tpt_tbl
= tbl
->expected_tpt
;
1197 s32 new_rate
, high
, low
, start_hi
;
1201 new_rate
= high
= low
= start_hi
= IWL_RATE_INVALID
;
1204 high_low
= rs_get_adjacent_rate(priv
, rate
, rate_mask
,
1207 low
= high_low
& 0xff;
1208 high
= (high_low
>> 8) & 0xff;
1211 * Lower the "search" bit rate, to give new "search" mode
1212 * approximately the same throughput as "active" if:
1214 * 1) "Active" mode has been working modestly well (but not
1215 * great), and expected "search" throughput (under perfect
1216 * conditions) at candidate rate is above the actual
1217 * measured "active" throughput (but less than expected
1218 * "active" throughput under perfect conditions).
1220 * 2) "Active" mode has been working perfectly or very well
1221 * and expected "search" throughput (under perfect
1222 * conditions) at candidate rate is above expected
1223 * "active" throughput (under perfect conditions).
1225 if ((((100 * tpt_tbl
[rate
]) > lq_sta
->last_tpt
) &&
1226 ((active_sr
> IWL_RATE_DECREASE_TH
) &&
1227 (active_sr
<= IWL_RATE_HIGH_TH
) &&
1228 (tpt_tbl
[rate
] <= active_tpt
))) ||
1229 ((active_sr
>= IWL_RATE_SCALE_SWITCH
) &&
1230 (tpt_tbl
[rate
] > active_tpt
))) {
1232 /* (2nd or later pass)
1233 * If we've already tried to raise the rate, and are
1234 * now trying to lower it, use the higher rate. */
1235 if (start_hi
!= IWL_RATE_INVALID
) {
1236 new_rate
= start_hi
;
1242 /* Loop again with lower rate */
1243 if (low
!= IWL_RATE_INVALID
)
1246 /* Lower rate not available, use the original */
1250 /* Else try to raise the "search" rate to match "active" */
1252 /* (2nd or later pass)
1253 * If we've already tried to lower the rate, and are
1254 * now trying to raise it, use the lower rate. */
1255 if (new_rate
!= IWL_RATE_INVALID
)
1258 /* Loop again with higher rate */
1259 else if (high
!= IWL_RATE_INVALID
) {
1263 /* Higher rate not available, use the original */
1275 * Set up search table for MIMO2
1277 static int rs_switch_to_mimo2(struct iwl_priv
*priv
,
1278 struct iwl_lq_sta
*lq_sta
,
1279 struct ieee80211_conf
*conf
,
1280 struct ieee80211_sta
*sta
,
1281 struct iwl_scale_tbl_info
*tbl
, int index
)
1285 s8 is_green
= lq_sta
->is_green
;
1286 struct iwl_station_priv
*sta_priv
= (void *)sta
->drv_priv
;
1287 struct iwl_rxon_context
*ctx
= sta_priv
->common
.ctx
;
1289 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1292 if (((sta
->ht_cap
.cap
& IEEE80211_HT_CAP_SM_PS
) >> 2)
1293 == WLAN_HT_CAP_SM_PS_STATIC
)
1296 /* Need both Tx chains/antennas to support MIMO */
1297 if (priv
->hw_params
.tx_chains_num
< 2)
1300 IWL_DEBUG_RATE(priv
, "LQ: try to switch to MIMO2\n");
1302 tbl
->lq_type
= LQ_MIMO2
;
1303 tbl
->is_dup
= lq_sta
->is_dup
;
1305 tbl
->max_search
= IWL_MAX_SEARCH
;
1306 rate_mask
= lq_sta
->active_mimo2_rate
;
1308 if (iwl_is_ht40_tx_allowed(priv
, ctx
, &sta
->ht_cap
))
1313 rs_set_expected_tpt_table(lq_sta
, tbl
);
1315 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1317 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 best rate %d mask %X\n", rate
, rate_mask
);
1318 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1319 IWL_DEBUG_RATE(priv
, "Can't switch with index %d rate mask %x\n",
1323 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1325 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1326 tbl
->current_rate
, is_green
);
1331 * Set up search table for MIMO3
1333 static int rs_switch_to_mimo3(struct iwl_priv
*priv
,
1334 struct iwl_lq_sta
*lq_sta
,
1335 struct ieee80211_conf
*conf
,
1336 struct ieee80211_sta
*sta
,
1337 struct iwl_scale_tbl_info
*tbl
, int index
)
1341 s8 is_green
= lq_sta
->is_green
;
1342 struct iwl_station_priv
*sta_priv
= (void *)sta
->drv_priv
;
1343 struct iwl_rxon_context
*ctx
= sta_priv
->common
.ctx
;
1345 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1348 if (((sta
->ht_cap
.cap
& IEEE80211_HT_CAP_SM_PS
) >> 2)
1349 == WLAN_HT_CAP_SM_PS_STATIC
)
1352 /* Need both Tx chains/antennas to support MIMO */
1353 if (priv
->hw_params
.tx_chains_num
< 3)
1356 IWL_DEBUG_RATE(priv
, "LQ: try to switch to MIMO3\n");
1358 tbl
->lq_type
= LQ_MIMO3
;
1359 tbl
->is_dup
= lq_sta
->is_dup
;
1361 tbl
->max_search
= IWL_MAX_11N_MIMO3_SEARCH
;
1362 rate_mask
= lq_sta
->active_mimo3_rate
;
1364 if (iwl_is_ht40_tx_allowed(priv
, ctx
, &sta
->ht_cap
))
1369 rs_set_expected_tpt_table(lq_sta
, tbl
);
1371 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1373 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 best rate %d mask %X\n",
1375 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1376 IWL_DEBUG_RATE(priv
, "Can't switch with index %d rate mask %x\n",
1380 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1382 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1383 tbl
->current_rate
, is_green
);
1388 * Set up search table for SISO
1390 static int rs_switch_to_siso(struct iwl_priv
*priv
,
1391 struct iwl_lq_sta
*lq_sta
,
1392 struct ieee80211_conf
*conf
,
1393 struct ieee80211_sta
*sta
,
1394 struct iwl_scale_tbl_info
*tbl
, int index
)
1397 u8 is_green
= lq_sta
->is_green
;
1399 struct iwl_station_priv
*sta_priv
= (void *)sta
->drv_priv
;
1400 struct iwl_rxon_context
*ctx
= sta_priv
->common
.ctx
;
1402 if (!conf_is_ht(conf
) || !sta
->ht_cap
.ht_supported
)
1405 IWL_DEBUG_RATE(priv
, "LQ: try to switch to SISO\n");
1407 tbl
->is_dup
= lq_sta
->is_dup
;
1408 tbl
->lq_type
= LQ_SISO
;
1410 tbl
->max_search
= IWL_MAX_SEARCH
;
1411 rate_mask
= lq_sta
->active_siso_rate
;
1413 if (iwl_is_ht40_tx_allowed(priv
, ctx
, &sta
->ht_cap
))
1419 tbl
->is_SGI
= 0; /*11n spec: no SGI in SISO+Greenfield*/
1421 rs_set_expected_tpt_table(lq_sta
, tbl
);
1422 rate
= rs_get_best_rate(priv
, lq_sta
, tbl
, rate_mask
, index
);
1424 IWL_DEBUG_RATE(priv
, "LQ: get best rate %d mask %X\n", rate
, rate_mask
);
1425 if ((rate
== IWL_RATE_INVALID
) || !((1 << rate
) & rate_mask
)) {
1426 IWL_DEBUG_RATE(priv
, "can not switch with index %d rate mask %x\n",
1430 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, rate
, is_green
);
1431 IWL_DEBUG_RATE(priv
, "LQ: Switch to new mcs %X index is green %X\n",
1432 tbl
->current_rate
, is_green
);
1437 * Try to switch to new modulation mode from legacy
1439 static int rs_move_legacy_other(struct iwl_priv
*priv
,
1440 struct iwl_lq_sta
*lq_sta
,
1441 struct ieee80211_conf
*conf
,
1442 struct ieee80211_sta
*sta
,
1445 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1446 struct iwl_scale_tbl_info
*search_tbl
=
1447 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1448 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1449 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1450 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1452 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1453 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1455 u8 update_search_tbl_counter
= 0;
1457 switch (priv
->bt_traffic_load
) {
1458 case IWL_BT_COEX_TRAFFIC_LOAD_NONE
:
1461 case IWL_BT_COEX_TRAFFIC_LOAD_LOW
:
1462 /* avoid antenna B unless MIMO */
1463 valid_tx_ant
= first_antenna(priv
->hw_params
.valid_tx_ant
);
1464 if (tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA2
)
1465 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1467 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH
:
1468 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS
:
1469 /* avoid antenna B and MIMO */
1470 valid_tx_ant
= first_antenna(priv
->hw_params
.valid_tx_ant
);
1471 if (tbl
->action
>= IWL_LEGACY_SWITCH_ANTENNA2
&&
1472 tbl
->action
!= IWL_LEGACY_SWITCH_SISO
)
1473 tbl
->action
= IWL_LEGACY_SWITCH_SISO
;
1476 IWL_ERR(priv
, "Invalid BT load %d", priv
->bt_traffic_load
);
1480 if (!iwl_ht_enabled(priv
))
1481 /* stay in Legacy */
1482 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1483 else if (iwl_tx_ant_restriction(priv
) == IWL_ANT_OK_SINGLE
&&
1484 tbl
->action
> IWL_LEGACY_SWITCH_SISO
)
1485 tbl
->action
= IWL_LEGACY_SWITCH_SISO
;
1487 /* configure as 1x1 if bt full concurrency */
1488 if (priv
->bt_full_concurrent
) {
1489 if (!iwl_ht_enabled(priv
))
1490 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1491 else if (tbl
->action
>= IWL_LEGACY_SWITCH_ANTENNA2
)
1492 tbl
->action
= IWL_LEGACY_SWITCH_SISO
;
1493 valid_tx_ant
= first_antenna(priv
->hw_params
.valid_tx_ant
);
1496 start_action
= tbl
->action
;
1498 lq_sta
->action_counter
++;
1499 switch (tbl
->action
) {
1500 case IWL_LEGACY_SWITCH_ANTENNA1
:
1501 case IWL_LEGACY_SWITCH_ANTENNA2
:
1502 IWL_DEBUG_RATE(priv
, "LQ: Legacy toggle Antenna\n");
1504 if ((tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA1
&&
1505 tx_chains_num
<= 1) ||
1506 (tbl
->action
== IWL_LEGACY_SWITCH_ANTENNA2
&&
1507 tx_chains_num
<= 2))
1510 /* Don't change antenna if success has been great */
1511 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
&&
1512 !priv
->bt_full_concurrent
&&
1513 priv
->bt_traffic_load
==
1514 IWL_BT_COEX_TRAFFIC_LOAD_NONE
)
1517 /* Set up search table to try other antenna */
1518 memcpy(search_tbl
, tbl
, sz
);
1520 if (rs_toggle_antenna(valid_tx_ant
,
1521 &search_tbl
->current_rate
, search_tbl
)) {
1522 update_search_tbl_counter
= 1;
1523 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1527 case IWL_LEGACY_SWITCH_SISO
:
1528 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to SISO\n");
1530 /* Set up search table to try SISO */
1531 memcpy(search_tbl
, tbl
, sz
);
1532 search_tbl
->is_SGI
= 0;
1533 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1536 lq_sta
->action_counter
= 0;
1541 case IWL_LEGACY_SWITCH_MIMO2_AB
:
1542 case IWL_LEGACY_SWITCH_MIMO2_AC
:
1543 case IWL_LEGACY_SWITCH_MIMO2_BC
:
1544 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to MIMO2\n");
1546 /* Set up search table to try MIMO */
1547 memcpy(search_tbl
, tbl
, sz
);
1548 search_tbl
->is_SGI
= 0;
1550 if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AB
)
1551 search_tbl
->ant_type
= ANT_AB
;
1552 else if (tbl
->action
== IWL_LEGACY_SWITCH_MIMO2_AC
)
1553 search_tbl
->ant_type
= ANT_AC
;
1555 search_tbl
->ant_type
= ANT_BC
;
1557 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1560 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1563 lq_sta
->action_counter
= 0;
1568 case IWL_LEGACY_SWITCH_MIMO3_ABC
:
1569 IWL_DEBUG_RATE(priv
, "LQ: Legacy switch to MIMO3\n");
1571 /* Set up search table to try MIMO3 */
1572 memcpy(search_tbl
, tbl
, sz
);
1573 search_tbl
->is_SGI
= 0;
1575 search_tbl
->ant_type
= ANT_ABC
;
1577 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1580 ret
= rs_switch_to_mimo3(priv
, lq_sta
, conf
, sta
,
1583 lq_sta
->action_counter
= 0;
1589 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO3_ABC
)
1590 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1592 if (tbl
->action
== start_action
)
1596 search_tbl
->lq_type
= LQ_NONE
;
1600 lq_sta
->search_better_tbl
= 1;
1602 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO3_ABC
)
1603 tbl
->action
= IWL_LEGACY_SWITCH_ANTENNA1
;
1604 if (update_search_tbl_counter
)
1605 search_tbl
->action
= tbl
->action
;
1611 * Try to switch to new modulation mode from SISO
1613 static int rs_move_siso_to_other(struct iwl_priv
*priv
,
1614 struct iwl_lq_sta
*lq_sta
,
1615 struct ieee80211_conf
*conf
,
1616 struct ieee80211_sta
*sta
, int index
)
1618 u8 is_green
= lq_sta
->is_green
;
1619 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1620 struct iwl_scale_tbl_info
*search_tbl
=
1621 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1622 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1623 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
1624 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1625 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1627 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1628 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1629 u8 update_search_tbl_counter
= 0;
1632 switch (priv
->bt_traffic_load
) {
1633 case IWL_BT_COEX_TRAFFIC_LOAD_NONE
:
1636 case IWL_BT_COEX_TRAFFIC_LOAD_LOW
:
1637 /* avoid antenna B unless MIMO */
1638 valid_tx_ant
= first_antenna(priv
->hw_params
.valid_tx_ant
);
1639 if (tbl
->action
== IWL_SISO_SWITCH_ANTENNA2
)
1640 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1642 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH
:
1643 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS
:
1644 /* avoid antenna B and MIMO */
1645 valid_tx_ant
= first_antenna(priv
->hw_params
.valid_tx_ant
);
1646 if (tbl
->action
!= IWL_SISO_SWITCH_ANTENNA1
)
1647 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1650 IWL_ERR(priv
, "Invalid BT load %d", priv
->bt_traffic_load
);
1654 if (iwl_tx_ant_restriction(priv
) == IWL_ANT_OK_SINGLE
&&
1655 tbl
->action
> IWL_SISO_SWITCH_ANTENNA2
) {
1657 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1660 /* configure as 1x1 if bt full concurrency */
1661 if (priv
->bt_full_concurrent
) {
1662 valid_tx_ant
= first_antenna(priv
->hw_params
.valid_tx_ant
);
1663 if (tbl
->action
>= IWL_LEGACY_SWITCH_ANTENNA2
)
1664 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1667 start_action
= tbl
->action
;
1669 lq_sta
->action_counter
++;
1670 switch (tbl
->action
) {
1671 case IWL_SISO_SWITCH_ANTENNA1
:
1672 case IWL_SISO_SWITCH_ANTENNA2
:
1673 IWL_DEBUG_RATE(priv
, "LQ: SISO toggle Antenna\n");
1674 if ((tbl
->action
== IWL_SISO_SWITCH_ANTENNA1
&&
1675 tx_chains_num
<= 1) ||
1676 (tbl
->action
== IWL_SISO_SWITCH_ANTENNA2
&&
1677 tx_chains_num
<= 2))
1680 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
&&
1681 !priv
->bt_full_concurrent
&&
1682 priv
->bt_traffic_load
==
1683 IWL_BT_COEX_TRAFFIC_LOAD_NONE
)
1686 memcpy(search_tbl
, tbl
, sz
);
1687 if (rs_toggle_antenna(valid_tx_ant
,
1688 &search_tbl
->current_rate
, search_tbl
)) {
1689 update_search_tbl_counter
= 1;
1693 case IWL_SISO_SWITCH_MIMO2_AB
:
1694 case IWL_SISO_SWITCH_MIMO2_AC
:
1695 case IWL_SISO_SWITCH_MIMO2_BC
:
1696 IWL_DEBUG_RATE(priv
, "LQ: SISO switch to MIMO2\n");
1697 memcpy(search_tbl
, tbl
, sz
);
1698 search_tbl
->is_SGI
= 0;
1700 if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AB
)
1701 search_tbl
->ant_type
= ANT_AB
;
1702 else if (tbl
->action
== IWL_SISO_SWITCH_MIMO2_AC
)
1703 search_tbl
->ant_type
= ANT_AC
;
1705 search_tbl
->ant_type
= ANT_BC
;
1707 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1710 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
1715 case IWL_SISO_SWITCH_GI
:
1716 if (!tbl
->is_ht40
&& !(ht_cap
->cap
&
1717 IEEE80211_HT_CAP_SGI_20
))
1719 if (tbl
->is_ht40
&& !(ht_cap
->cap
&
1720 IEEE80211_HT_CAP_SGI_40
))
1723 IWL_DEBUG_RATE(priv
, "LQ: SISO toggle SGI/NGI\n");
1725 memcpy(search_tbl
, tbl
, sz
);
1731 "SGI was set in GF+SISO\n");
1733 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1734 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1736 s32 tpt
= lq_sta
->last_tpt
/ 100;
1737 if (tpt
>= search_tbl
->expected_tpt
[index
])
1740 search_tbl
->current_rate
=
1741 rate_n_flags_from_tbl(priv
, search_tbl
,
1743 update_search_tbl_counter
= 1;
1745 case IWL_SISO_SWITCH_MIMO3_ABC
:
1746 IWL_DEBUG_RATE(priv
, "LQ: SISO switch to MIMO3\n");
1747 memcpy(search_tbl
, tbl
, sz
);
1748 search_tbl
->is_SGI
= 0;
1749 search_tbl
->ant_type
= ANT_ABC
;
1751 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1754 ret
= rs_switch_to_mimo3(priv
, lq_sta
, conf
, sta
,
1761 if (tbl
->action
> IWL_LEGACY_SWITCH_MIMO3_ABC
)
1762 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1764 if (tbl
->action
== start_action
)
1767 search_tbl
->lq_type
= LQ_NONE
;
1771 lq_sta
->search_better_tbl
= 1;
1773 if (tbl
->action
> IWL_SISO_SWITCH_MIMO3_ABC
)
1774 tbl
->action
= IWL_SISO_SWITCH_ANTENNA1
;
1775 if (update_search_tbl_counter
)
1776 search_tbl
->action
= tbl
->action
;
1782 * Try to switch to new modulation mode from MIMO2
1784 static int rs_move_mimo2_to_other(struct iwl_priv
*priv
,
1785 struct iwl_lq_sta
*lq_sta
,
1786 struct ieee80211_conf
*conf
,
1787 struct ieee80211_sta
*sta
, int index
)
1789 s8 is_green
= lq_sta
->is_green
;
1790 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1791 struct iwl_scale_tbl_info
*search_tbl
=
1792 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1793 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1794 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
1795 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1796 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1798 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1799 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1800 u8 update_search_tbl_counter
= 0;
1803 switch (priv
->bt_traffic_load
) {
1804 case IWL_BT_COEX_TRAFFIC_LOAD_NONE
:
1807 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH
:
1808 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS
:
1809 /* avoid antenna B and MIMO */
1810 if (tbl
->action
!= IWL_MIMO2_SWITCH_SISO_A
)
1811 tbl
->action
= IWL_MIMO2_SWITCH_SISO_A
;
1813 case IWL_BT_COEX_TRAFFIC_LOAD_LOW
:
1814 /* avoid antenna B unless MIMO */
1815 if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_B
||
1816 tbl
->action
== IWL_MIMO2_SWITCH_SISO_C
)
1817 tbl
->action
= IWL_MIMO2_SWITCH_SISO_A
;
1820 IWL_ERR(priv
, "Invalid BT load %d", priv
->bt_traffic_load
);
1824 if ((iwl_tx_ant_restriction(priv
) == IWL_ANT_OK_SINGLE
) &&
1825 (tbl
->action
< IWL_MIMO2_SWITCH_SISO_A
||
1826 tbl
->action
> IWL_MIMO2_SWITCH_SISO_C
)) {
1827 /* switch in SISO */
1828 tbl
->action
= IWL_MIMO2_SWITCH_SISO_A
;
1831 /* configure as 1x1 if bt full concurrency */
1832 if (priv
->bt_full_concurrent
&&
1833 (tbl
->action
< IWL_MIMO2_SWITCH_SISO_A
||
1834 tbl
->action
> IWL_MIMO2_SWITCH_SISO_C
))
1835 tbl
->action
= IWL_MIMO2_SWITCH_SISO_A
;
1837 start_action
= tbl
->action
;
1839 lq_sta
->action_counter
++;
1840 switch (tbl
->action
) {
1841 case IWL_MIMO2_SWITCH_ANTENNA1
:
1842 case IWL_MIMO2_SWITCH_ANTENNA2
:
1843 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 toggle Antennas\n");
1845 if (tx_chains_num
<= 2)
1848 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
1851 memcpy(search_tbl
, tbl
, sz
);
1852 if (rs_toggle_antenna(valid_tx_ant
,
1853 &search_tbl
->current_rate
, search_tbl
)) {
1854 update_search_tbl_counter
= 1;
1858 case IWL_MIMO2_SWITCH_SISO_A
:
1859 case IWL_MIMO2_SWITCH_SISO_B
:
1860 case IWL_MIMO2_SWITCH_SISO_C
:
1861 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 switch to SISO\n");
1863 /* Set up new search table for SISO */
1864 memcpy(search_tbl
, tbl
, sz
);
1866 if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_A
)
1867 search_tbl
->ant_type
= ANT_A
;
1868 else if (tbl
->action
== IWL_MIMO2_SWITCH_SISO_B
)
1869 search_tbl
->ant_type
= ANT_B
;
1871 search_tbl
->ant_type
= ANT_C
;
1873 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1876 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
1883 case IWL_MIMO2_SWITCH_GI
:
1884 if (!tbl
->is_ht40
&& !(ht_cap
->cap
&
1885 IEEE80211_HT_CAP_SGI_20
))
1887 if (tbl
->is_ht40
&& !(ht_cap
->cap
&
1888 IEEE80211_HT_CAP_SGI_40
))
1891 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 toggle SGI/NGI\n");
1893 /* Set up new search table for MIMO2 */
1894 memcpy(search_tbl
, tbl
, sz
);
1895 search_tbl
->is_SGI
= !tbl
->is_SGI
;
1896 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
1898 * If active table already uses the fastest possible
1899 * modulation (dual stream with short guard interval),
1900 * and it's working well, there's no need to look
1901 * for a better type of modulation!
1904 s32 tpt
= lq_sta
->last_tpt
/ 100;
1905 if (tpt
>= search_tbl
->expected_tpt
[index
])
1908 search_tbl
->current_rate
=
1909 rate_n_flags_from_tbl(priv
, search_tbl
,
1911 update_search_tbl_counter
= 1;
1914 case IWL_MIMO2_SWITCH_MIMO3_ABC
:
1915 IWL_DEBUG_RATE(priv
, "LQ: MIMO2 switch to MIMO3\n");
1916 memcpy(search_tbl
, tbl
, sz
);
1917 search_tbl
->is_SGI
= 0;
1918 search_tbl
->ant_type
= ANT_ABC
;
1920 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
1923 ret
= rs_switch_to_mimo3(priv
, lq_sta
, conf
, sta
,
1931 if (tbl
->action
> IWL_MIMO2_SWITCH_MIMO3_ABC
)
1932 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1934 if (tbl
->action
== start_action
)
1937 search_tbl
->lq_type
= LQ_NONE
;
1940 lq_sta
->search_better_tbl
= 1;
1942 if (tbl
->action
> IWL_MIMO2_SWITCH_MIMO3_ABC
)
1943 tbl
->action
= IWL_MIMO2_SWITCH_ANTENNA1
;
1944 if (update_search_tbl_counter
)
1945 search_tbl
->action
= tbl
->action
;
1952 * Try to switch to new modulation mode from MIMO3
1954 static int rs_move_mimo3_to_other(struct iwl_priv
*priv
,
1955 struct iwl_lq_sta
*lq_sta
,
1956 struct ieee80211_conf
*conf
,
1957 struct ieee80211_sta
*sta
, int index
)
1959 s8 is_green
= lq_sta
->is_green
;
1960 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
1961 struct iwl_scale_tbl_info
*search_tbl
=
1962 &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
1963 struct iwl_rate_scale_data
*window
= &(tbl
->win
[index
]);
1964 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
1965 u32 sz
= (sizeof(struct iwl_scale_tbl_info
) -
1966 (sizeof(struct iwl_rate_scale_data
) * IWL_RATE_COUNT
));
1968 u8 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
1969 u8 tx_chains_num
= priv
->hw_params
.tx_chains_num
;
1971 u8 update_search_tbl_counter
= 0;
1973 switch (priv
->bt_traffic_load
) {
1974 case IWL_BT_COEX_TRAFFIC_LOAD_NONE
:
1977 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH
:
1978 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS
:
1979 /* avoid antenna B and MIMO */
1980 if (tbl
->action
!= IWL_MIMO3_SWITCH_SISO_A
)
1981 tbl
->action
= IWL_MIMO3_SWITCH_SISO_A
;
1983 case IWL_BT_COEX_TRAFFIC_LOAD_LOW
:
1984 /* avoid antenna B unless MIMO */
1985 if (tbl
->action
== IWL_MIMO3_SWITCH_SISO_B
||
1986 tbl
->action
== IWL_MIMO3_SWITCH_SISO_C
)
1987 tbl
->action
= IWL_MIMO3_SWITCH_SISO_A
;
1990 IWL_ERR(priv
, "Invalid BT load %d", priv
->bt_traffic_load
);
1994 if ((iwl_tx_ant_restriction(priv
) == IWL_ANT_OK_SINGLE
) &&
1995 (tbl
->action
< IWL_MIMO3_SWITCH_SISO_A
||
1996 tbl
->action
> IWL_MIMO3_SWITCH_SISO_C
)) {
1997 /* switch in SISO */
1998 tbl
->action
= IWL_MIMO3_SWITCH_SISO_A
;
2001 /* configure as 1x1 if bt full concurrency */
2002 if (priv
->bt_full_concurrent
&&
2003 (tbl
->action
< IWL_MIMO3_SWITCH_SISO_A
||
2004 tbl
->action
> IWL_MIMO3_SWITCH_SISO_C
))
2005 tbl
->action
= IWL_MIMO3_SWITCH_SISO_A
;
2007 start_action
= tbl
->action
;
2009 lq_sta
->action_counter
++;
2010 switch (tbl
->action
) {
2011 case IWL_MIMO3_SWITCH_ANTENNA1
:
2012 case IWL_MIMO3_SWITCH_ANTENNA2
:
2013 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 toggle Antennas\n");
2015 if (tx_chains_num
<= 3)
2018 if (window
->success_ratio
>= IWL_RS_GOOD_RATIO
)
2021 memcpy(search_tbl
, tbl
, sz
);
2022 if (rs_toggle_antenna(valid_tx_ant
,
2023 &search_tbl
->current_rate
, search_tbl
))
2026 case IWL_MIMO3_SWITCH_SISO_A
:
2027 case IWL_MIMO3_SWITCH_SISO_B
:
2028 case IWL_MIMO3_SWITCH_SISO_C
:
2029 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 switch to SISO\n");
2031 /* Set up new search table for SISO */
2032 memcpy(search_tbl
, tbl
, sz
);
2034 if (tbl
->action
== IWL_MIMO3_SWITCH_SISO_A
)
2035 search_tbl
->ant_type
= ANT_A
;
2036 else if (tbl
->action
== IWL_MIMO3_SWITCH_SISO_B
)
2037 search_tbl
->ant_type
= ANT_B
;
2039 search_tbl
->ant_type
= ANT_C
;
2041 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
2044 ret
= rs_switch_to_siso(priv
, lq_sta
, conf
, sta
,
2051 case IWL_MIMO3_SWITCH_MIMO2_AB
:
2052 case IWL_MIMO3_SWITCH_MIMO2_AC
:
2053 case IWL_MIMO3_SWITCH_MIMO2_BC
:
2054 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 switch to MIMO2\n");
2056 memcpy(search_tbl
, tbl
, sz
);
2057 search_tbl
->is_SGI
= 0;
2058 if (tbl
->action
== IWL_MIMO3_SWITCH_MIMO2_AB
)
2059 search_tbl
->ant_type
= ANT_AB
;
2060 else if (tbl
->action
== IWL_MIMO3_SWITCH_MIMO2_AC
)
2061 search_tbl
->ant_type
= ANT_AC
;
2063 search_tbl
->ant_type
= ANT_BC
;
2065 if (!rs_is_valid_ant(valid_tx_ant
, search_tbl
->ant_type
))
2068 ret
= rs_switch_to_mimo2(priv
, lq_sta
, conf
, sta
,
2075 case IWL_MIMO3_SWITCH_GI
:
2076 if (!tbl
->is_ht40
&& !(ht_cap
->cap
&
2077 IEEE80211_HT_CAP_SGI_20
))
2079 if (tbl
->is_ht40
&& !(ht_cap
->cap
&
2080 IEEE80211_HT_CAP_SGI_40
))
2083 IWL_DEBUG_RATE(priv
, "LQ: MIMO3 toggle SGI/NGI\n");
2085 /* Set up new search table for MIMO */
2086 memcpy(search_tbl
, tbl
, sz
);
2087 search_tbl
->is_SGI
= !tbl
->is_SGI
;
2088 rs_set_expected_tpt_table(lq_sta
, search_tbl
);
2090 * If active table already uses the fastest possible
2091 * modulation (dual stream with short guard interval),
2092 * and it's working well, there's no need to look
2093 * for a better type of modulation!
2096 s32 tpt
= lq_sta
->last_tpt
/ 100;
2097 if (tpt
>= search_tbl
->expected_tpt
[index
])
2100 search_tbl
->current_rate
=
2101 rate_n_flags_from_tbl(priv
, search_tbl
,
2103 update_search_tbl_counter
= 1;
2107 if (tbl
->action
> IWL_MIMO3_SWITCH_GI
)
2108 tbl
->action
= IWL_MIMO3_SWITCH_ANTENNA1
;
2110 if (tbl
->action
== start_action
)
2113 search_tbl
->lq_type
= LQ_NONE
;
2116 lq_sta
->search_better_tbl
= 1;
2118 if (tbl
->action
> IWL_MIMO3_SWITCH_GI
)
2119 tbl
->action
= IWL_MIMO3_SWITCH_ANTENNA1
;
2120 if (update_search_tbl_counter
)
2121 search_tbl
->action
= tbl
->action
;
2128 * Check whether we should continue using same modulation mode, or
2129 * begin search for a new mode, based on:
2130 * 1) # tx successes or failures while using this mode
2131 * 2) # times calling this function
2132 * 3) elapsed time in this mode (not used, for now)
2134 static void rs_stay_in_table(struct iwl_lq_sta
*lq_sta
, bool force_search
)
2136 struct iwl_scale_tbl_info
*tbl
;
2139 int flush_interval_passed
= 0;
2140 struct iwl_priv
*priv
;
2143 active_tbl
= lq_sta
->active_tbl
;
2145 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2147 /* If we've been disallowing search, see if we should now allow it */
2148 if (lq_sta
->stay_in_tbl
) {
2150 /* Elapsed time using current modulation mode */
2151 if (lq_sta
->flush_timer
)
2152 flush_interval_passed
=
2154 (unsigned long)(lq_sta
->flush_timer
+
2155 IWL_RATE_SCALE_FLUSH_INTVL
));
2158 * Check if we should allow search for new modulation mode.
2159 * If many frames have failed or succeeded, or we've used
2160 * this same modulation for a long time, allow search, and
2161 * reset history stats that keep track of whether we should
2162 * allow a new search. Also (below) reset all bitmaps and
2163 * stats in active history.
2166 (lq_sta
->total_failed
> lq_sta
->max_failure_limit
) ||
2167 (lq_sta
->total_success
> lq_sta
->max_success_limit
) ||
2168 ((!lq_sta
->search_better_tbl
) && (lq_sta
->flush_timer
)
2169 && (flush_interval_passed
))) {
2170 IWL_DEBUG_RATE(priv
, "LQ: stay is expired %d %d %d\n:",
2171 lq_sta
->total_failed
,
2172 lq_sta
->total_success
,
2173 flush_interval_passed
);
2175 /* Allow search for new mode */
2176 lq_sta
->stay_in_tbl
= 0; /* only place reset */
2177 lq_sta
->total_failed
= 0;
2178 lq_sta
->total_success
= 0;
2179 lq_sta
->flush_timer
= 0;
2182 * Else if we've used this modulation mode enough repetitions
2183 * (regardless of elapsed time or success/failure), reset
2184 * history bitmaps and rate-specific stats for all rates in
2188 lq_sta
->table_count
++;
2189 if (lq_sta
->table_count
>=
2190 lq_sta
->table_count_limit
) {
2191 lq_sta
->table_count
= 0;
2193 IWL_DEBUG_RATE(priv
, "LQ: stay in table clear win\n");
2194 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2195 rs_rate_scale_clear_window(
2200 /* If transitioning to allow "search", reset all history
2201 * bitmaps and stats in active table (this will become the new
2202 * "search" table). */
2203 if (!lq_sta
->stay_in_tbl
) {
2204 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2205 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2211 * setup rate table in uCode
2212 * return rate_n_flags as used in the table
2214 static void rs_update_rate_tbl(struct iwl_priv
*priv
,
2215 struct iwl_rxon_context
*ctx
,
2216 struct iwl_lq_sta
*lq_sta
,
2217 struct iwl_scale_tbl_info
*tbl
,
2218 int index
, u8 is_green
)
2222 /* Update uCode's rate table. */
2223 rate
= rate_n_flags_from_tbl(priv
, tbl
, index
, is_green
);
2224 rs_fill_link_cmd(priv
, lq_sta
, rate
);
2225 iwl_send_lq_cmd(priv
, ctx
, &lq_sta
->lq
, CMD_ASYNC
, false);
2229 * Do rate scaling and search for new modulation mode.
2231 static void rs_rate_scale_perform(struct iwl_priv
*priv
,
2232 struct sk_buff
*skb
,
2233 struct ieee80211_sta
*sta
,
2234 struct iwl_lq_sta
*lq_sta
)
2236 struct ieee80211_hw
*hw
= priv
->hw
;
2237 struct ieee80211_conf
*conf
= &hw
->conf
;
2238 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2239 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
2240 int low
= IWL_RATE_INVALID
;
2241 int high
= IWL_RATE_INVALID
;
2244 struct iwl_rate_scale_data
*window
= NULL
;
2245 int current_tpt
= IWL_INVALID_VALUE
;
2246 int low_tpt
= IWL_INVALID_VALUE
;
2247 int high_tpt
= IWL_INVALID_VALUE
;
2249 s8 scale_action
= 0;
2252 struct iwl_scale_tbl_info
*tbl
, *tbl1
;
2253 u16 rate_scale_index_msk
= 0;
2259 u8 tid
= MAX_TID_COUNT
;
2260 struct iwl_tid_data
*tid_data
;
2261 struct iwl_station_priv
*sta_priv
= (void *)sta
->drv_priv
;
2262 struct iwl_rxon_context
*ctx
= sta_priv
->common
.ctx
;
2264 IWL_DEBUG_RATE(priv
, "rate scale calculate new rate for skb\n");
2266 /* Send management frames and NO_ACK data using lowest rate. */
2267 /* TODO: this could probably be improved.. */
2268 if (!ieee80211_is_data(hdr
->frame_control
) ||
2269 info
->flags
& IEEE80211_TX_CTL_NO_ACK
)
2272 if (!sta
|| !lq_sta
)
2275 lq_sta
->supp_rates
= sta
->supp_rates
[lq_sta
->band
];
2277 tid
= rs_tl_add_packet(lq_sta
, hdr
);
2278 if ((tid
!= MAX_TID_COUNT
) && (lq_sta
->tx_agg_tid_en
& (1 << tid
))) {
2279 tid_data
= &priv
->stations
[lq_sta
->lq
.sta_id
].tid
[tid
];
2280 if (tid_data
->agg
.state
== IWL_AGG_OFF
)
2288 * Select rate-scale / modulation-mode table to work with in
2289 * the rest of this function: "search" if searching for better
2290 * modulation mode, or "active" if doing rate scaling within a mode.
2292 if (!lq_sta
->search_better_tbl
)
2293 active_tbl
= lq_sta
->active_tbl
;
2295 active_tbl
= 1 - lq_sta
->active_tbl
;
2297 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2298 if (is_legacy(tbl
->lq_type
))
2299 lq_sta
->is_green
= 0;
2301 lq_sta
->is_green
= rs_use_green(sta
);
2302 is_green
= lq_sta
->is_green
;
2304 /* current tx rate */
2305 index
= lq_sta
->last_txrate_idx
;
2307 IWL_DEBUG_RATE(priv
, "Rate scale index %d for type %d\n", index
,
2310 /* rates available for this association, and for modulation mode */
2311 rate_mask
= rs_get_supported_rates(lq_sta
, hdr
, tbl
->lq_type
);
2313 IWL_DEBUG_RATE(priv
, "mask 0x%04X\n", rate_mask
);
2315 /* mask with station rate restriction */
2316 if (is_legacy(tbl
->lq_type
)) {
2317 if (lq_sta
->band
== IEEE80211_BAND_5GHZ
)
2318 /* supp_rates has no CCK bits in A mode */
2319 rate_scale_index_msk
= (u16
) (rate_mask
&
2320 (lq_sta
->supp_rates
<< IWL_FIRST_OFDM_RATE
));
2322 rate_scale_index_msk
= (u16
) (rate_mask
&
2323 lq_sta
->supp_rates
);
2326 rate_scale_index_msk
= rate_mask
;
2328 if (!rate_scale_index_msk
)
2329 rate_scale_index_msk
= rate_mask
;
2331 if (!((1 << index
) & rate_scale_index_msk
)) {
2332 IWL_ERR(priv
, "Current Rate is not valid\n");
2333 if (lq_sta
->search_better_tbl
) {
2334 /* revert to active table if search table is not valid*/
2335 tbl
->lq_type
= LQ_NONE
;
2336 lq_sta
->search_better_tbl
= 0;
2337 tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2338 /* get "active" rate info */
2339 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
2340 rs_update_rate_tbl(priv
, ctx
, lq_sta
, tbl
,
2346 /* Get expected throughput table and history window for current rate */
2347 if (!tbl
->expected_tpt
) {
2348 IWL_ERR(priv
, "tbl->expected_tpt is NULL\n");
2352 /* force user max rate if set by user */
2353 if ((lq_sta
->max_rate_idx
!= -1) &&
2354 (lq_sta
->max_rate_idx
< index
)) {
2355 index
= lq_sta
->max_rate_idx
;
2357 window
= &(tbl
->win
[index
]);
2361 window
= &(tbl
->win
[index
]);
2364 * If there is not enough history to calculate actual average
2365 * throughput, keep analyzing results of more tx frames, without
2366 * changing rate or mode (bypass most of the rest of this function).
2367 * Set up new rate table in uCode only if old rate is not supported
2368 * in current association (use new rate found above).
2370 fail_count
= window
->counter
- window
->success_counter
;
2371 if ((fail_count
< IWL_RATE_MIN_FAILURE_TH
) &&
2372 (window
->success_counter
< IWL_RATE_MIN_SUCCESS_TH
)) {
2373 IWL_DEBUG_RATE(priv
, "LQ: still below TH. succ=%d total=%d "
2375 window
->success_counter
, window
->counter
, index
);
2377 /* Can't calculate this yet; not enough history */
2378 window
->average_tpt
= IWL_INVALID_VALUE
;
2380 /* Should we stay with this modulation mode,
2381 * or search for a new one? */
2382 rs_stay_in_table(lq_sta
, false);
2386 /* Else we have enough samples; calculate estimate of
2387 * actual average throughput */
2388 if (window
->average_tpt
!= ((window
->success_ratio
*
2389 tbl
->expected_tpt
[index
] + 64) / 128)) {
2390 IWL_ERR(priv
, "expected_tpt should have been calculated by now\n");
2391 window
->average_tpt
= ((window
->success_ratio
*
2392 tbl
->expected_tpt
[index
] + 64) / 128);
2395 /* If we are searching for better modulation mode, check success. */
2396 if (lq_sta
->search_better_tbl
&&
2397 (iwl_tx_ant_restriction(priv
) == IWL_ANT_OK_MULTI
)) {
2398 /* If good success, continue using the "search" mode;
2399 * no need to send new link quality command, since we're
2400 * continuing to use the setup that we've been trying. */
2401 if (window
->average_tpt
> lq_sta
->last_tpt
) {
2403 IWL_DEBUG_RATE(priv
, "LQ: SWITCHING TO NEW TABLE "
2404 "suc=%d cur-tpt=%d old-tpt=%d\n",
2405 window
->success_ratio
,
2406 window
->average_tpt
,
2409 if (!is_legacy(tbl
->lq_type
))
2410 lq_sta
->enable_counter
= 1;
2412 /* Swap tables; "search" becomes "active" */
2413 lq_sta
->active_tbl
= active_tbl
;
2414 current_tpt
= window
->average_tpt
;
2416 /* Else poor success; go back to mode in "active" table */
2419 IWL_DEBUG_RATE(priv
, "LQ: GOING BACK TO THE OLD TABLE "
2420 "suc=%d cur-tpt=%d old-tpt=%d\n",
2421 window
->success_ratio
,
2422 window
->average_tpt
,
2425 /* Nullify "search" table */
2426 tbl
->lq_type
= LQ_NONE
;
2428 /* Revert to "active" table */
2429 active_tbl
= lq_sta
->active_tbl
;
2430 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2432 /* Revert to "active" rate and throughput info */
2433 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
2434 current_tpt
= lq_sta
->last_tpt
;
2436 /* Need to set up a new rate table in uCode */
2440 /* Either way, we've made a decision; modulation mode
2441 * search is done, allow rate adjustment next time. */
2442 lq_sta
->search_better_tbl
= 0;
2443 done_search
= 1; /* Don't switch modes below! */
2447 /* (Else) not in search of better modulation mode, try for better
2448 * starting rate, while staying in this mode. */
2449 high_low
= rs_get_adjacent_rate(priv
, index
, rate_scale_index_msk
,
2451 low
= high_low
& 0xff;
2452 high
= (high_low
>> 8) & 0xff;
2454 /* If user set max rate, dont allow higher than user constrain */
2455 if ((lq_sta
->max_rate_idx
!= -1) &&
2456 (lq_sta
->max_rate_idx
< high
))
2457 high
= IWL_RATE_INVALID
;
2459 sr
= window
->success_ratio
;
2461 /* Collect measured throughputs for current and adjacent rates */
2462 current_tpt
= window
->average_tpt
;
2463 if (low
!= IWL_RATE_INVALID
)
2464 low_tpt
= tbl
->win
[low
].average_tpt
;
2465 if (high
!= IWL_RATE_INVALID
)
2466 high_tpt
= tbl
->win
[high
].average_tpt
;
2470 /* Too many failures, decrease rate */
2471 if ((sr
<= IWL_RATE_DECREASE_TH
) || (current_tpt
== 0)) {
2472 IWL_DEBUG_RATE(priv
, "decrease rate because of low success_ratio\n");
2475 /* No throughput measured yet for adjacent rates; try increase. */
2476 } else if ((low_tpt
== IWL_INVALID_VALUE
) &&
2477 (high_tpt
== IWL_INVALID_VALUE
)) {
2479 if (high
!= IWL_RATE_INVALID
&& sr
>= IWL_RATE_INCREASE_TH
)
2481 else if (low
!= IWL_RATE_INVALID
)
2485 /* Both adjacent throughputs are measured, but neither one has better
2486 * throughput; we're using the best rate, don't change it! */
2487 else if ((low_tpt
!= IWL_INVALID_VALUE
) &&
2488 (high_tpt
!= IWL_INVALID_VALUE
) &&
2489 (low_tpt
< current_tpt
) &&
2490 (high_tpt
< current_tpt
))
2493 /* At least one adjacent rate's throughput is measured,
2494 * and may have better performance. */
2496 /* Higher adjacent rate's throughput is measured */
2497 if (high_tpt
!= IWL_INVALID_VALUE
) {
2498 /* Higher rate has better throughput */
2499 if (high_tpt
> current_tpt
&&
2500 sr
>= IWL_RATE_INCREASE_TH
) {
2506 /* Lower adjacent rate's throughput is measured */
2507 } else if (low_tpt
!= IWL_INVALID_VALUE
) {
2508 /* Lower rate has better throughput */
2509 if (low_tpt
> current_tpt
) {
2510 IWL_DEBUG_RATE(priv
,
2511 "decrease rate because of low tpt\n");
2513 } else if (sr
>= IWL_RATE_INCREASE_TH
) {
2519 /* Sanity check; asked for decrease, but success rate or throughput
2520 * has been good at old rate. Don't change it. */
2521 if ((scale_action
== -1) && (low
!= IWL_RATE_INVALID
) &&
2522 ((sr
> IWL_RATE_HIGH_TH
) ||
2523 (current_tpt
> (100 * tbl
->expected_tpt
[low
]))))
2525 if (!iwl_ht_enabled(priv
) && !is_legacy(tbl
->lq_type
))
2527 if (iwl_tx_ant_restriction(priv
) != IWL_ANT_OK_MULTI
&&
2528 (is_mimo2(tbl
->lq_type
) || is_mimo3(tbl
->lq_type
)))
2531 if ((priv
->bt_traffic_load
>= IWL_BT_COEX_TRAFFIC_LOAD_HIGH
) &&
2532 (is_mimo2(tbl
->lq_type
) || is_mimo3(tbl
->lq_type
))) {
2533 if (lq_sta
->last_bt_traffic
> priv
->bt_traffic_load
) {
2535 * don't set scale_action, don't want to scale up if
2536 * the rate scale doesn't otherwise think that is a
2539 } else if (lq_sta
->last_bt_traffic
<= priv
->bt_traffic_load
) {
2543 lq_sta
->last_bt_traffic
= priv
->bt_traffic_load
;
2545 if ((priv
->bt_traffic_load
>= IWL_BT_COEX_TRAFFIC_LOAD_HIGH
) &&
2546 (is_mimo2(tbl
->lq_type
) || is_mimo3(tbl
->lq_type
))) {
2547 /* search for a new modulation */
2548 rs_stay_in_table(lq_sta
, true);
2552 switch (scale_action
) {
2554 /* Decrease starting rate, update uCode's rate table */
2555 if (low
!= IWL_RATE_INVALID
) {
2562 /* Increase starting rate, update uCode's rate table */
2563 if (high
!= IWL_RATE_INVALID
) {
2575 IWL_DEBUG_RATE(priv
, "choose rate scale index %d action %d low %d "
2576 "high %d type %d\n",
2577 index
, scale_action
, low
, high
, tbl
->lq_type
);
2580 /* Replace uCode's rate table for the destination station. */
2582 rs_update_rate_tbl(priv
, ctx
, lq_sta
, tbl
, index
, is_green
);
2584 if (iwl_tx_ant_restriction(priv
) == IWL_ANT_OK_MULTI
) {
2585 /* Should we stay with this modulation mode,
2586 * or search for a new one? */
2587 rs_stay_in_table(lq_sta
, false);
2590 * Search for new modulation mode if we're:
2591 * 1) Not changing rates right now
2592 * 2) Not just finishing up a search
2593 * 3) Allowing a new search
2595 if (!update_lq
&& !done_search
&& !lq_sta
->stay_in_tbl
&& window
->counter
) {
2596 /* Save current throughput to compare with "search" throughput*/
2597 lq_sta
->last_tpt
= current_tpt
;
2599 /* Select a new "search" modulation mode to try.
2600 * If one is found, set up the new "search" table. */
2601 if (is_legacy(tbl
->lq_type
))
2602 rs_move_legacy_other(priv
, lq_sta
, conf
, sta
, index
);
2603 else if (is_siso(tbl
->lq_type
))
2604 rs_move_siso_to_other(priv
, lq_sta
, conf
, sta
, index
);
2605 else if (is_mimo2(tbl
->lq_type
))
2606 rs_move_mimo2_to_other(priv
, lq_sta
, conf
, sta
, index
);
2608 rs_move_mimo3_to_other(priv
, lq_sta
, conf
, sta
, index
);
2610 /* If new "search" mode was selected, set up in uCode table */
2611 if (lq_sta
->search_better_tbl
) {
2612 /* Access the "search" table, clear its history. */
2613 tbl
= &(lq_sta
->lq_info
[(1 - lq_sta
->active_tbl
)]);
2614 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2615 rs_rate_scale_clear_window(&(tbl
->win
[i
]));
2617 /* Use new "search" start rate */
2618 index
= iwl_hwrate_to_plcp_idx(tbl
->current_rate
);
2620 IWL_DEBUG_RATE(priv
, "Switch current mcs: %X index: %d\n",
2621 tbl
->current_rate
, index
);
2622 rs_fill_link_cmd(priv
, lq_sta
, tbl
->current_rate
);
2623 iwl_send_lq_cmd(priv
, ctx
, &lq_sta
->lq
, CMD_ASYNC
, false);
2628 if (done_search
&& !lq_sta
->stay_in_tbl
) {
2629 /* If the "active" (non-search) mode was legacy,
2630 * and we've tried switching antennas,
2631 * but we haven't been able to try HT modes (not available),
2632 * stay with best antenna legacy modulation for a while
2633 * before next round of mode comparisons. */
2634 tbl1
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
2635 if (is_legacy(tbl1
->lq_type
) && !conf_is_ht(conf
) &&
2636 lq_sta
->action_counter
> tbl1
->max_search
) {
2637 IWL_DEBUG_RATE(priv
, "LQ: STAY in legacy table\n");
2638 rs_set_stay_in_table(priv
, 1, lq_sta
);
2641 /* If we're in an HT mode, and all 3 mode switch actions
2642 * have been tried and compared, stay in this best modulation
2643 * mode for a while before next round of mode comparisons. */
2644 if (lq_sta
->enable_counter
&&
2645 (lq_sta
->action_counter
>= tbl1
->max_search
) &&
2646 iwl_ht_enabled(priv
)) {
2647 if ((lq_sta
->last_tpt
> IWL_AGG_TPT_THREHOLD
) &&
2648 (lq_sta
->tx_agg_tid_en
& (1 << tid
)) &&
2649 (tid
!= MAX_TID_COUNT
)) {
2651 &priv
->stations
[lq_sta
->lq
.sta_id
].tid
[tid
];
2652 if (tid_data
->agg
.state
== IWL_AGG_OFF
) {
2653 IWL_DEBUG_RATE(priv
,
2654 "try to aggregate tid %d\n",
2656 rs_tl_turn_on_agg(priv
, tid
,
2660 rs_set_stay_in_table(priv
, 0, lq_sta
);
2665 tbl
->current_rate
= rate_n_flags_from_tbl(priv
, tbl
, index
, is_green
);
2667 lq_sta
->last_txrate_idx
= i
;
2671 * rs_initialize_lq - Initialize a station's hardware rate table
2673 * The uCode's station table contains a table of fallback rates
2674 * for automatic fallback during transmission.
2676 * NOTE: This sets up a default set of values. These will be replaced later
2677 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2680 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2681 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2682 * which requires station table entry to exist).
2684 static void rs_initialize_lq(struct iwl_priv
*priv
,
2685 struct ieee80211_conf
*conf
,
2686 struct ieee80211_sta
*sta
,
2687 struct iwl_lq_sta
*lq_sta
)
2689 struct iwl_scale_tbl_info
*tbl
;
2693 u8 use_green
= rs_use_green(sta
);
2696 struct iwl_station_priv
*sta_priv
;
2697 struct iwl_rxon_context
*ctx
;
2699 if (!sta
|| !lq_sta
)
2702 sta_priv
= (void *)sta
->drv_priv
;
2703 ctx
= sta_priv
->common
.ctx
;
2705 i
= lq_sta
->last_txrate_idx
;
2707 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2709 if (!lq_sta
->search_better_tbl
)
2710 active_tbl
= lq_sta
->active_tbl
;
2712 active_tbl
= 1 - lq_sta
->active_tbl
;
2714 tbl
= &(lq_sta
->lq_info
[active_tbl
]);
2716 if ((i
< 0) || (i
>= IWL_RATE_COUNT
))
2719 rate
= iwl_rates
[i
].plcp
;
2720 tbl
->ant_type
= first_antenna(valid_tx_ant
);
2721 rate
|= tbl
->ant_type
<< RATE_MCS_ANT_POS
;
2723 if (i
>= IWL_FIRST_CCK_RATE
&& i
<= IWL_LAST_CCK_RATE
)
2724 rate
|= RATE_MCS_CCK_MSK
;
2726 rs_get_tbl_info_from_mcs(rate
, priv
->band
, tbl
, &rate_idx
);
2727 if (!rs_is_valid_ant(valid_tx_ant
, tbl
->ant_type
))
2728 rs_toggle_antenna(valid_tx_ant
, &rate
, tbl
);
2730 rate
= rate_n_flags_from_tbl(priv
, tbl
, rate_idx
, use_green
);
2731 tbl
->current_rate
= rate
;
2732 rs_set_expected_tpt_table(lq_sta
, tbl
);
2733 rs_fill_link_cmd(NULL
, lq_sta
, rate
);
2734 priv
->stations
[lq_sta
->lq
.sta_id
].lq
= &lq_sta
->lq
;
2735 iwl_send_lq_cmd(priv
, ctx
, &lq_sta
->lq
, CMD_SYNC
, true);
2738 static void rs_get_rate(void *priv_r
, struct ieee80211_sta
*sta
, void *priv_sta
,
2739 struct ieee80211_tx_rate_control
*txrc
)
2742 struct sk_buff
*skb
= txrc
->skb
;
2743 struct ieee80211_supported_band
*sband
= txrc
->sband
;
2744 struct iwl_priv
*priv __maybe_unused
= (struct iwl_priv
*)priv_r
;
2745 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
2746 struct iwl_lq_sta
*lq_sta
= priv_sta
;
2749 IWL_DEBUG_RATE_LIMIT(priv
, "rate scale calculate new rate for skb\n");
2751 /* Get max rate if user set max rate */
2753 lq_sta
->max_rate_idx
= txrc
->max_rate_idx
;
2754 if ((sband
->band
== IEEE80211_BAND_5GHZ
) &&
2755 (lq_sta
->max_rate_idx
!= -1))
2756 lq_sta
->max_rate_idx
+= IWL_FIRST_OFDM_RATE
;
2757 if ((lq_sta
->max_rate_idx
< 0) ||
2758 (lq_sta
->max_rate_idx
>= IWL_RATE_COUNT
))
2759 lq_sta
->max_rate_idx
= -1;
2762 /* Treat uninitialized rate scaling data same as non-existing. */
2763 if (lq_sta
&& !lq_sta
->drv
) {
2764 IWL_DEBUG_RATE(priv
, "Rate scaling not initialized yet.\n");
2768 /* Send management frames and NO_ACK data using lowest rate. */
2769 if (rate_control_send_low(sta
, priv_sta
, txrc
))
2772 rate_idx
= lq_sta
->last_txrate_idx
;
2774 if (lq_sta
->last_rate_n_flags
& RATE_MCS_HT_MSK
) {
2775 rate_idx
-= IWL_FIRST_OFDM_RATE
;
2776 /* 6M and 9M shared same MCS index */
2777 rate_idx
= (rate_idx
> 0) ? (rate_idx
- 1) : 0;
2778 if (rs_extract_rate(lq_sta
->last_rate_n_flags
) >=
2779 IWL_RATE_MIMO3_6M_PLCP
)
2780 rate_idx
= rate_idx
+ (2 * MCS_INDEX_PER_STREAM
);
2781 else if (rs_extract_rate(lq_sta
->last_rate_n_flags
) >=
2782 IWL_RATE_MIMO2_6M_PLCP
)
2783 rate_idx
= rate_idx
+ MCS_INDEX_PER_STREAM
;
2784 info
->control
.rates
[0].flags
= IEEE80211_TX_RC_MCS
;
2785 if (lq_sta
->last_rate_n_flags
& RATE_MCS_SGI_MSK
)
2786 info
->control
.rates
[0].flags
|= IEEE80211_TX_RC_SHORT_GI
;
2787 if (lq_sta
->last_rate_n_flags
& RATE_MCS_DUP_MSK
)
2788 info
->control
.rates
[0].flags
|= IEEE80211_TX_RC_DUP_DATA
;
2789 if (lq_sta
->last_rate_n_flags
& RATE_MCS_HT40_MSK
)
2790 info
->control
.rates
[0].flags
|= IEEE80211_TX_RC_40_MHZ_WIDTH
;
2791 if (lq_sta
->last_rate_n_flags
& RATE_MCS_GF_MSK
)
2792 info
->control
.rates
[0].flags
|= IEEE80211_TX_RC_GREEN_FIELD
;
2794 /* Check for invalid rates */
2795 if ((rate_idx
< 0) || (rate_idx
>= IWL_RATE_COUNT_LEGACY
) ||
2796 ((sband
->band
== IEEE80211_BAND_5GHZ
) &&
2797 (rate_idx
< IWL_FIRST_OFDM_RATE
)))
2798 rate_idx
= rate_lowest_index(sband
, sta
);
2799 /* On valid 5 GHz rate, adjust index */
2800 else if (sband
->band
== IEEE80211_BAND_5GHZ
)
2801 rate_idx
-= IWL_FIRST_OFDM_RATE
;
2802 info
->control
.rates
[0].flags
= 0;
2804 info
->control
.rates
[0].idx
= rate_idx
;
2808 static void *rs_alloc_sta(void *priv_rate
, struct ieee80211_sta
*sta
,
2811 struct iwl_station_priv
*sta_priv
= (struct iwl_station_priv
*) sta
->drv_priv
;
2812 struct iwl_priv
*priv
;
2814 priv
= (struct iwl_priv
*)priv_rate
;
2815 IWL_DEBUG_RATE(priv
, "create station rate scale window\n");
2817 return &sta_priv
->lq_sta
;
2821 * Called after adding a new station to initialize rate scaling
2823 void iwl_rs_rate_init(struct iwl_priv
*priv
, struct ieee80211_sta
*sta
, u8 sta_id
)
2826 struct ieee80211_hw
*hw
= priv
->hw
;
2827 struct ieee80211_conf
*conf
= &priv
->hw
->conf
;
2828 struct ieee80211_sta_ht_cap
*ht_cap
= &sta
->ht_cap
;
2829 struct iwl_station_priv
*sta_priv
;
2830 struct iwl_lq_sta
*lq_sta
;
2831 struct ieee80211_supported_band
*sband
;
2833 sta_priv
= (struct iwl_station_priv
*) sta
->drv_priv
;
2834 lq_sta
= &sta_priv
->lq_sta
;
2835 sband
= hw
->wiphy
->bands
[conf
->channel
->band
];
2838 lq_sta
->lq
.sta_id
= sta_id
;
2840 for (j
= 0; j
< LQ_SIZE
; j
++)
2841 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2842 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2844 lq_sta
->flush_timer
= 0;
2845 lq_sta
->supp_rates
= sta
->supp_rates
[sband
->band
];
2846 for (j
= 0; j
< LQ_SIZE
; j
++)
2847 for (i
= 0; i
< IWL_RATE_COUNT
; i
++)
2848 rs_rate_scale_clear_window(&lq_sta
->lq_info
[j
].win
[i
]);
2850 IWL_DEBUG_RATE(priv
, "LQ: *** rate scale station global init for station %d ***\n",
2852 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2853 * the lowest or the highest rate.. Could consider using RSSI from
2854 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2858 lq_sta
->max_rate_idx
= -1;
2859 lq_sta
->missed_rate_counter
= IWL_MISSED_RATE_MAX
;
2860 lq_sta
->is_green
= rs_use_green(sta
);
2861 lq_sta
->active_legacy_rate
= priv
->active_rate
& ~(0x1000);
2862 lq_sta
->band
= priv
->band
;
2864 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2865 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2867 lq_sta
->active_siso_rate
= ht_cap
->mcs
.rx_mask
[0] << 1;
2868 lq_sta
->active_siso_rate
|= ht_cap
->mcs
.rx_mask
[0] & 0x1;
2869 lq_sta
->active_siso_rate
&= ~((u16
)0x2);
2870 lq_sta
->active_siso_rate
<<= IWL_FIRST_OFDM_RATE
;
2873 lq_sta
->active_mimo2_rate
= ht_cap
->mcs
.rx_mask
[1] << 1;
2874 lq_sta
->active_mimo2_rate
|= ht_cap
->mcs
.rx_mask
[1] & 0x1;
2875 lq_sta
->active_mimo2_rate
&= ~((u16
)0x2);
2876 lq_sta
->active_mimo2_rate
<<= IWL_FIRST_OFDM_RATE
;
2878 lq_sta
->active_mimo3_rate
= ht_cap
->mcs
.rx_mask
[2] << 1;
2879 lq_sta
->active_mimo3_rate
|= ht_cap
->mcs
.rx_mask
[2] & 0x1;
2880 lq_sta
->active_mimo3_rate
&= ~((u16
)0x2);
2881 lq_sta
->active_mimo3_rate
<<= IWL_FIRST_OFDM_RATE
;
2883 IWL_DEBUG_RATE(priv
, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2884 lq_sta
->active_siso_rate
,
2885 lq_sta
->active_mimo2_rate
,
2886 lq_sta
->active_mimo3_rate
);
2888 /* These values will be overridden later */
2889 lq_sta
->lq
.general_params
.single_stream_ant_msk
=
2890 first_antenna(priv
->hw_params
.valid_tx_ant
);
2891 lq_sta
->lq
.general_params
.dual_stream_ant_msk
=
2892 priv
->hw_params
.valid_tx_ant
&
2893 ~first_antenna(priv
->hw_params
.valid_tx_ant
);
2894 if (!lq_sta
->lq
.general_params
.dual_stream_ant_msk
) {
2895 lq_sta
->lq
.general_params
.dual_stream_ant_msk
= ANT_AB
;
2896 } else if (num_of_ant(priv
->hw_params
.valid_tx_ant
) == 2) {
2897 lq_sta
->lq
.general_params
.dual_stream_ant_msk
=
2898 priv
->hw_params
.valid_tx_ant
;
2901 /* as default allow aggregation for all tids */
2902 lq_sta
->tx_agg_tid_en
= IWL_AGG_ALL_TID
;
2905 /* Set last_txrate_idx to lowest rate */
2906 lq_sta
->last_txrate_idx
= rate_lowest_index(sband
, sta
);
2907 if (sband
->band
== IEEE80211_BAND_5GHZ
)
2908 lq_sta
->last_txrate_idx
+= IWL_FIRST_OFDM_RATE
;
2910 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
2911 priv
->tm_fixed_rate
= 0;
2913 #ifdef CONFIG_MAC80211_DEBUGFS
2914 lq_sta
->dbg_fixed_rate
= 0;
2917 rs_initialize_lq(priv
, conf
, sta
, lq_sta
);
2920 static void rs_fill_link_cmd(struct iwl_priv
*priv
,
2921 struct iwl_lq_sta
*lq_sta
, u32 new_rate
)
2923 struct iwl_scale_tbl_info tbl_type
;
2926 int repeat_rate
= 0;
2927 u8 ant_toggle_cnt
= 0;
2928 u8 use_ht_possible
= 1;
2929 u8 valid_tx_ant
= 0;
2930 struct iwl_station_priv
*sta_priv
=
2931 container_of(lq_sta
, struct iwl_station_priv
, lq_sta
);
2932 struct iwl_link_quality_cmd
*lq_cmd
= &lq_sta
->lq
;
2934 /* Override starting rate (index 0) if needed for debug purposes */
2935 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2937 /* Interpret new_rate (rate_n_flags) */
2938 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
,
2939 &tbl_type
, &rate_idx
);
2941 if (priv
&& priv
->bt_full_concurrent
) {
2944 first_antenna(priv
->hw_params
.valid_tx_ant
);
2947 /* How many times should we repeat the initial rate? */
2948 if (is_legacy(tbl_type
.lq_type
)) {
2950 repeat_rate
= IWL_NUMBER_TRY
;
2952 repeat_rate
= min(IWL_HT_NUMBER_TRY
,
2953 LINK_QUAL_AGG_DISABLE_START_DEF
- 1);
2956 lq_cmd
->general_params
.mimo_delimiter
=
2957 is_mimo(tbl_type
.lq_type
) ? 1 : 0;
2959 /* Fill 1st table entry (index 0) */
2960 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
2962 if (num_of_ant(tbl_type
.ant_type
) == 1) {
2963 lq_cmd
->general_params
.single_stream_ant_msk
=
2965 } else if (num_of_ant(tbl_type
.ant_type
) == 2) {
2966 lq_cmd
->general_params
.dual_stream_ant_msk
=
2968 } /* otherwise we don't modify the existing value */
2973 if (priv
->bt_full_concurrent
)
2974 valid_tx_ant
= ANT_A
;
2976 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
2979 /* Fill rest of rate table */
2980 while (index
< LINK_QUAL_MAX_RETRY_NUM
) {
2981 /* Repeat initial/next rate.
2982 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2983 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2984 while (repeat_rate
> 0 && (index
< LINK_QUAL_MAX_RETRY_NUM
)) {
2985 if (is_legacy(tbl_type
.lq_type
)) {
2986 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
2989 rs_toggle_antenna(valid_tx_ant
,
2990 &new_rate
, &tbl_type
))
2994 /* Override next rate if needed for debug purposes */
2995 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
2997 /* Fill next table entry */
2998 lq_cmd
->rs_table
[index
].rate_n_flags
=
2999 cpu_to_le32(new_rate
);
3004 rs_get_tbl_info_from_mcs(new_rate
, lq_sta
->band
, &tbl_type
,
3007 if (priv
&& priv
->bt_full_concurrent
) {
3010 first_antenna(priv
->hw_params
.valid_tx_ant
);
3013 /* Indicate to uCode which entries might be MIMO.
3014 * If initial rate was MIMO, this will finally end up
3015 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3016 if (is_mimo(tbl_type
.lq_type
))
3017 lq_cmd
->general_params
.mimo_delimiter
= index
;
3020 new_rate
= rs_get_lower_rate(lq_sta
, &tbl_type
, rate_idx
,
3023 /* How many times should we repeat the next rate? */
3024 if (is_legacy(tbl_type
.lq_type
)) {
3025 if (ant_toggle_cnt
< NUM_TRY_BEFORE_ANT_TOGGLE
)
3028 rs_toggle_antenna(valid_tx_ant
,
3029 &new_rate
, &tbl_type
))
3032 repeat_rate
= IWL_NUMBER_TRY
;
3034 repeat_rate
= IWL_HT_NUMBER_TRY
;
3037 /* Don't allow HT rates after next pass.
3038 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3039 use_ht_possible
= 0;
3041 /* Override next rate if needed for debug purposes */
3042 rs_dbgfs_set_mcs(lq_sta
, &new_rate
, index
);
3044 /* Fill next table entry */
3045 lq_cmd
->rs_table
[index
].rate_n_flags
= cpu_to_le32(new_rate
);
3051 lq_cmd
->agg_params
.agg_frame_cnt_limit
=
3052 sta_priv
->max_agg_bufsize
?: LINK_QUAL_AGG_FRAME_LIMIT_DEF
;
3053 lq_cmd
->agg_params
.agg_dis_start_th
= LINK_QUAL_AGG_DISABLE_START_DEF
;
3055 lq_cmd
->agg_params
.agg_time_limit
=
3056 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF
);
3058 * overwrite if needed, pass aggregation time limit
3061 if (priv
&& priv
->cfg
->bt_params
&&
3062 priv
->cfg
->bt_params
->agg_time_limit
&&
3063 priv
->bt_traffic_load
>= IWL_BT_COEX_TRAFFIC_LOAD_HIGH
)
3064 lq_cmd
->agg_params
.agg_time_limit
=
3065 cpu_to_le16(priv
->cfg
->bt_params
->agg_time_limit
);
3068 static void *rs_alloc(struct ieee80211_hw
*hw
, struct dentry
*debugfsdir
)
3072 /* rate scale requires free function to be implemented */
3073 static void rs_free(void *priv_rate
)
3078 static void rs_free_sta(void *priv_r
, struct ieee80211_sta
*sta
,
3081 struct iwl_priv
*priv __maybe_unused
= priv_r
;
3083 IWL_DEBUG_RATE(priv
, "enter\n");
3084 IWL_DEBUG_RATE(priv
, "leave\n");
3087 #ifdef CONFIG_MAC80211_DEBUGFS
3088 static int open_file_generic(struct inode
*inode
, struct file
*file
)
3090 file
->private_data
= inode
->i_private
;
3093 static void rs_dbgfs_set_mcs(struct iwl_lq_sta
*lq_sta
,
3094 u32
*rate_n_flags
, int index
)
3096 struct iwl_priv
*priv
;
3101 valid_tx_ant
= priv
->hw_params
.valid_tx_ant
;
3102 if (lq_sta
->dbg_fixed_rate
) {
3104 ((lq_sta
->dbg_fixed_rate
& RATE_MCS_ANT_ABC_MSK
)
3105 >> RATE_MCS_ANT_POS
);
3106 if ((valid_tx_ant
& ant_sel_tx
) == ant_sel_tx
) {
3107 *rate_n_flags
= lq_sta
->dbg_fixed_rate
;
3108 IWL_DEBUG_RATE(priv
, "Fixed rate ON\n");
3110 lq_sta
->dbg_fixed_rate
= 0;
3112 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3113 ant_sel_tx
, valid_tx_ant
);
3114 IWL_DEBUG_RATE(priv
, "Fixed rate OFF\n");
3117 IWL_DEBUG_RATE(priv
, "Fixed rate OFF\n");
3121 static ssize_t
rs_sta_dbgfs_scale_table_write(struct file
*file
,
3122 const char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3124 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3125 struct iwl_priv
*priv
;
3132 memset(buf
, 0, sizeof(buf
));
3133 buf_size
= min(count
, sizeof(buf
) - 1);
3134 if (copy_from_user(buf
, user_buf
, buf_size
))
3137 if (sscanf(buf
, "%x", &parsed_rate
) == 1)
3138 lq_sta
->dbg_fixed_rate
= parsed_rate
;
3140 lq_sta
->dbg_fixed_rate
= 0;
3142 rs_program_fix_rate(priv
, lq_sta
);
3147 static ssize_t
rs_sta_dbgfs_scale_table_read(struct file
*file
,
3148 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3156 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3157 struct iwl_priv
*priv
;
3158 struct iwl_scale_tbl_info
*tbl
= &(lq_sta
->lq_info
[lq_sta
->active_tbl
]);
3161 buff
= kmalloc(1024, GFP_KERNEL
);
3165 desc
+= sprintf(buff
+desc
, "sta_id %d\n", lq_sta
->lq
.sta_id
);
3166 desc
+= sprintf(buff
+desc
, "failed=%d success=%d rate=0%X\n",
3167 lq_sta
->total_failed
, lq_sta
->total_success
,
3168 lq_sta
->active_legacy_rate
);
3169 desc
+= sprintf(buff
+desc
, "fixed rate 0x%X\n",
3170 lq_sta
->dbg_fixed_rate
);
3171 desc
+= sprintf(buff
+desc
, "valid_tx_ant %s%s%s\n",
3172 (priv
->hw_params
.valid_tx_ant
& ANT_A
) ? "ANT_A," : "",
3173 (priv
->hw_params
.valid_tx_ant
& ANT_B
) ? "ANT_B," : "",
3174 (priv
->hw_params
.valid_tx_ant
& ANT_C
) ? "ANT_C" : "");
3175 desc
+= sprintf(buff
+desc
, "lq type %s\n",
3176 (is_legacy(tbl
->lq_type
)) ? "legacy" : "HT");
3177 if (is_Ht(tbl
->lq_type
)) {
3178 desc
+= sprintf(buff
+desc
, " %s",
3179 (is_siso(tbl
->lq_type
)) ? "SISO" :
3180 ((is_mimo2(tbl
->lq_type
)) ? "MIMO2" : "MIMO3"));
3181 desc
+= sprintf(buff
+desc
, " %s",
3182 (tbl
->is_ht40
) ? "40MHz" : "20MHz");
3183 desc
+= sprintf(buff
+desc
, " %s %s %s\n", (tbl
->is_SGI
) ? "SGI" : "",
3184 (lq_sta
->is_green
) ? "GF enabled" : "",
3185 (lq_sta
->is_agg
) ? "AGG on" : "");
3187 desc
+= sprintf(buff
+desc
, "last tx rate=0x%X\n",
3188 lq_sta
->last_rate_n_flags
);
3189 desc
+= sprintf(buff
+desc
, "general:"
3190 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3191 lq_sta
->lq
.general_params
.flags
,
3192 lq_sta
->lq
.general_params
.mimo_delimiter
,
3193 lq_sta
->lq
.general_params
.single_stream_ant_msk
,
3194 lq_sta
->lq
.general_params
.dual_stream_ant_msk
);
3196 desc
+= sprintf(buff
+desc
, "agg:"
3197 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3198 le16_to_cpu(lq_sta
->lq
.agg_params
.agg_time_limit
),
3199 lq_sta
->lq
.agg_params
.agg_dis_start_th
,
3200 lq_sta
->lq
.agg_params
.agg_frame_cnt_limit
);
3202 desc
+= sprintf(buff
+desc
,
3203 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3204 lq_sta
->lq
.general_params
.start_rate_index
[0],
3205 lq_sta
->lq
.general_params
.start_rate_index
[1],
3206 lq_sta
->lq
.general_params
.start_rate_index
[2],
3207 lq_sta
->lq
.general_params
.start_rate_index
[3]);
3209 for (i
= 0; i
< LINK_QUAL_MAX_RETRY_NUM
; i
++) {
3210 index
= iwl_hwrate_to_plcp_idx(
3211 le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
));
3212 if (is_legacy(tbl
->lq_type
)) {
3213 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X %smbps\n",
3214 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
),
3215 iwl_rate_mcs
[index
].mbps
);
3217 desc
+= sprintf(buff
+desc
, " rate[%d] 0x%X %smbps (%s)\n",
3218 i
, le32_to_cpu(lq_sta
->lq
.rs_table
[i
].rate_n_flags
),
3219 iwl_rate_mcs
[index
].mbps
, iwl_rate_mcs
[index
].mcs
);
3223 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3228 static const struct file_operations rs_sta_dbgfs_scale_table_ops
= {
3229 .write
= rs_sta_dbgfs_scale_table_write
,
3230 .read
= rs_sta_dbgfs_scale_table_read
,
3231 .open
= open_file_generic
,
3232 .llseek
= default_llseek
,
3234 static ssize_t
rs_sta_dbgfs_stats_table_read(struct file
*file
,
3235 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3242 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3244 buff
= kmalloc(1024, GFP_KERNEL
);
3248 for (i
= 0; i
< LQ_SIZE
; i
++) {
3249 desc
+= sprintf(buff
+desc
,
3250 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3252 lq_sta
->active_tbl
== i
? "*" : "x",
3253 lq_sta
->lq_info
[i
].lq_type
,
3254 lq_sta
->lq_info
[i
].is_SGI
,
3255 lq_sta
->lq_info
[i
].is_ht40
,
3256 lq_sta
->lq_info
[i
].is_dup
,
3258 lq_sta
->lq_info
[i
].current_rate
);
3259 for (j
= 0; j
< IWL_RATE_COUNT
; j
++) {
3260 desc
+= sprintf(buff
+desc
,
3261 "counter=%d success=%d %%=%d\n",
3262 lq_sta
->lq_info
[i
].win
[j
].counter
,
3263 lq_sta
->lq_info
[i
].win
[j
].success_counter
,
3264 lq_sta
->lq_info
[i
].win
[j
].success_ratio
);
3267 ret
= simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3272 static const struct file_operations rs_sta_dbgfs_stats_table_ops
= {
3273 .read
= rs_sta_dbgfs_stats_table_read
,
3274 .open
= open_file_generic
,
3275 .llseek
= default_llseek
,
3278 static ssize_t
rs_sta_dbgfs_rate_scale_data_read(struct file
*file
,
3279 char __user
*user_buf
, size_t count
, loff_t
*ppos
)
3281 struct iwl_lq_sta
*lq_sta
= file
->private_data
;
3282 struct iwl_scale_tbl_info
*tbl
= &lq_sta
->lq_info
[lq_sta
->active_tbl
];
3286 if (is_Ht(tbl
->lq_type
))
3287 desc
+= sprintf(buff
+desc
,
3288 "Bit Rate= %d Mb/s\n",
3289 tbl
->expected_tpt
[lq_sta
->last_txrate_idx
]);
3291 desc
+= sprintf(buff
+desc
,
3292 "Bit Rate= %d Mb/s\n",
3293 iwl_rates
[lq_sta
->last_txrate_idx
].ieee
>> 1);
3295 return simple_read_from_buffer(user_buf
, count
, ppos
, buff
, desc
);
3298 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops
= {
3299 .read
= rs_sta_dbgfs_rate_scale_data_read
,
3300 .open
= open_file_generic
,
3301 .llseek
= default_llseek
,
3304 static void rs_add_debugfs(void *priv
, void *priv_sta
,
3307 struct iwl_lq_sta
*lq_sta
= priv_sta
;
3308 lq_sta
->rs_sta_dbgfs_scale_table_file
=
3309 debugfs_create_file("rate_scale_table", S_IRUSR
| S_IWUSR
, dir
,
3310 lq_sta
, &rs_sta_dbgfs_scale_table_ops
);
3311 lq_sta
->rs_sta_dbgfs_stats_table_file
=
3312 debugfs_create_file("rate_stats_table", S_IRUSR
, dir
,
3313 lq_sta
, &rs_sta_dbgfs_stats_table_ops
);
3314 lq_sta
->rs_sta_dbgfs_rate_scale_data_file
=
3315 debugfs_create_file("rate_scale_data", S_IRUSR
, dir
,
3316 lq_sta
, &rs_sta_dbgfs_rate_scale_data_ops
);
3317 lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
=
3318 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR
| S_IWUSR
, dir
,
3319 &lq_sta
->tx_agg_tid_en
);
3323 static void rs_remove_debugfs(void *priv
, void *priv_sta
)
3325 struct iwl_lq_sta
*lq_sta
= priv_sta
;
3326 debugfs_remove(lq_sta
->rs_sta_dbgfs_scale_table_file
);
3327 debugfs_remove(lq_sta
->rs_sta_dbgfs_stats_table_file
);
3328 debugfs_remove(lq_sta
->rs_sta_dbgfs_rate_scale_data_file
);
3329 debugfs_remove(lq_sta
->rs_sta_dbgfs_tx_agg_tid_en_file
);
3334 * Initialization of rate scaling information is done by driver after
3335 * the station is added. Since mac80211 calls this function before a
3336 * station is added we ignore it.
3338 static void rs_rate_init_stub(void *priv_r
, struct ieee80211_supported_band
*sband
,
3339 struct ieee80211_sta
*sta
, void *priv_sta
)
3342 static struct rate_control_ops rs_ops
= {
3345 .tx_status
= rs_tx_status
,
3346 .get_rate
= rs_get_rate
,
3347 .rate_init
= rs_rate_init_stub
,
3350 .alloc_sta
= rs_alloc_sta
,
3351 .free_sta
= rs_free_sta
,
3352 #ifdef CONFIG_MAC80211_DEBUGFS
3353 .add_sta_debugfs
= rs_add_debugfs
,
3354 .remove_sta_debugfs
= rs_remove_debugfs
,
3358 int iwlagn_rate_control_register(void)
3360 return ieee80211_rate_control_register(&rs_ops
);
3363 void iwlagn_rate_control_unregister(void)
3365 ieee80211_rate_control_unregister(&rs_ops
);