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iwlwifi: mvm: don't start BA agreement when BT is active
[linux-block.git] / drivers / net / wireless / iwlwifi / mvm / rs.c
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8ca151b5
JB		 1/******************************************************************************
2 *
3 * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
4 *
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.
8 *
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
12 * more details.
13 *
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
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26#include <linux/kernel.h>
27#include <linux/init.h>
28#include <linux/skbuff.h>
29#include <linux/slab.h>
30#include <net/mac80211.h>
31
32#include <linux/netdevice.h>
33#include <linux/etherdevice.h>
34#include <linux/delay.h>
35
36#include <linux/workqueue.h>
37#include "rs.h"
38#include "fw-api.h"
39#include "sta.h"
40#include "iwl-op-mode.h"
41#include "mvm.h"
42
43#define RS_NAME "iwl-mvm-rs"
44
45#define NUM_TRY_BEFORE_ANT_TOGGLE 1
46#define IWL_NUMBER_TRY 1
47#define IWL_HT_NUMBER_TRY 3
48
49#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52
53/* max allowed rate miss before sync LQ cmd */
54#define IWL_MISSED_RATE_MAX 15
55/* max time to accum history 2 seconds */
56#define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
57
58static u8 rs_ht_to_legacy[] = {
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66};
67
68static const u8 ant_toggle_lookup[] = {
69 /*ANT_NONE -> */ ANT_NONE,
70 /*ANT_A -> */ ANT_B,
71 /*ANT_B -> */ ANT_C,
72 /*ANT_AB -> */ ANT_BC,
73 /*ANT_C -> */ ANT_A,
74 /*ANT_AC -> */ ANT_AB,
75 /*ANT_BC -> */ ANT_AC,
76 /*ANT_ABC -> */ ANT_ABC,
77};
78
79#define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
80 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
81 IWL_RATE_SISO_##s##M_PLCP, \
82 IWL_RATE_MIMO2_##s##M_PLCP,\
83 IWL_RATE_MIMO3_##s##M_PLCP,\
84 IWL_RATE_##r##M_IEEE, \
85 IWL_RATE_##ip##M_INDEX, \
86 IWL_RATE_##in##M_INDEX, \
87 IWL_RATE_##rp##M_INDEX, \
88 IWL_RATE_##rn##M_INDEX, \
89 IWL_RATE_##pp##M_INDEX, \
90 IWL_RATE_##np##M_INDEX }
91
92/*
93 * Parameter order:
94 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
95 *
96 * If there isn't a valid next or previous rate then INV is used which
97 * maps to IWL_RATE_INVALID
98 *
99 */
100static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
101 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
102 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
103 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
104 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
105 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
106 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
107 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
108 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
109 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
110 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
111 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
112 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
113 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
114 /* FIXME:RS: ^^ should be INV (legacy) */
115};
116
117static inline u8 rs_extract_rate(u32 rate_n_flags)
118{
119 /* also works for HT because bits 7:6 are zero there */
120 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
121}
122
123static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
124{
125 int idx = 0;
126
127 /* HT rate format */
128 if (rate_n_flags & RATE_MCS_HT_MSK) {
129 idx = rs_extract_rate(rate_n_flags);
130
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;
135
136 idx += IWL_FIRST_OFDM_RATE;
137 /* skip 9M not supported in ht*/
138 if (idx >= IWL_RATE_9M_INDEX)
139 idx += 1;
140 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
141 return idx;
142
143 /* legacy rate format, search for match in table */
144 } else {
145 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
146 if (iwl_rates[idx].plcp ==
147 rs_extract_rate(rate_n_flags))
148 return idx;
149 }
150
151 return -1;
152}
153
154static void rs_rate_scale_perform(struct iwl_mvm *mvm,
155 struct sk_buff *skb,
156 struct ieee80211_sta *sta,
157 struct iwl_lq_sta *lq_sta);
158static void rs_fill_link_cmd(struct iwl_mvm *mvm,
159 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
160static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
161
162
163#ifdef CONFIG_MAC80211_DEBUGFS
164static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
165 u32 *rate_n_flags, int index);
166#else
167static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
168 u32 *rate_n_flags, int index)
169{}
170#endif
171
172/**
173 * The following tables contain the expected throughput metrics for all rates
174 *
175 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
176 *
177 * where invalid entries are zeros.
178 *
179 * CCK rates are only valid in legacy table and will only be used in G
180 * (2.4 GHz) band.
181 */
182
183static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
184 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
185};
186
187static 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 */
192};
193
194static 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 */
199};
200
201static 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*/
206};
207
208static 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 */
213};
214
215static 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 */
220};
221
222static 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 */
227};
228
229/* mbps, mcs */
230static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
231 { "1", "BPSK DSSS"},
232 { "2", "QPSK DSSS"},
233 {"5.5", "BPSK CCK"},
234 { "11", "QPSK CCK"},
235 { "6", "BPSK 1/2"},
236 { "9", "BPSK 1/2"},
237 { "12", "QPSK 1/2"},
238 { "18", "QPSK 3/4"},
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"},
244};
245
246#define MCS_INDEX_PER_STREAM (8)
247
248static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
249{
250 window->data = 0;
251 window->success_counter = 0;
252 window->success_ratio = IWL_INVALID_VALUE;
253 window->counter = 0;
254 window->average_tpt = IWL_INVALID_VALUE;
255 window->stamp = 0;
256}
257
258static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
259{
260 return (ant_type & valid_antenna) == ant_type;
261}
262
263/*
264 * removes the old data from the statistics. All data that is older than
265 * TID_MAX_TIME_DIFF, will be deleted.
266 */
267static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
268{
269 /* The oldest age we want to keep */
270 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
271
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;
277 tl->queue_count--;
278 tl->head++;
279 if (tl->head >= TID_QUEUE_MAX_SIZE)
280 tl->head = 0;
281 }
282}
283
284/*
285 * increment traffic load value for tid and also remove
286 * any old values if passed the certain time period
287 */
288static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
289 struct ieee80211_hdr *hdr)
290{
291 u32 curr_time = jiffies_to_msecs(jiffies);
292 u32 time_diff;
293 s32 index;
294 struct iwl_traffic_load *tl = NULL;
295 u8 tid;
296
297 if (ieee80211_is_data_qos(hdr->frame_control)) {
298 u8 *qc = ieee80211_get_qos_ctl(hdr);
299 tid = qc[0] & 0xf;
300 } else {
301 return IWL_MAX_TID_COUNT;
302 }
303
304 if (unlikely(tid >= IWL_MAX_TID_COUNT))
305 return IWL_MAX_TID_COUNT;
306
307 tl = &lq_data->load[tid];
308
309 curr_time -= curr_time % TID_ROUND_VALUE;
310
311 /* Happens only for the first packet. Initialize the data */
312 if (!(tl->queue_count)) {
313 tl->total = 1;
314 tl->time_stamp = curr_time;
315 tl->queue_count = 1;
316 tl->head = 0;
317 tl->packet_count[0] = 1;
318 return IWL_MAX_TID_COUNT;
319 }
320
321 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
322 index = time_diff / TID_QUEUE_CELL_SPACING;
323
324 /* The history is too long: remove data that is older than */
325 /* TID_MAX_TIME_DIFF */
326 if (index >= TID_QUEUE_MAX_SIZE)
327 rs_tl_rm_old_stats(tl, curr_time);
328
329 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
330 tl->packet_count[index] = tl->packet_count[index] + 1;
331 tl->total = tl->total + 1;
332
333 if ((index + 1) > tl->queue_count)
334 tl->queue_count = index + 1;
335
336 return tid;
337}
338
339#ifdef CONFIG_MAC80211_DEBUGFS
340/**
341 * Program the device to use fixed rate for frame transmit
342 * This is for debugging/testing only
343 * once the device start use fixed rate, we need to reload the module
344 * to being back the normal operation.
345 */
346static void rs_program_fix_rate(struct iwl_mvm *mvm,
347 struct iwl_lq_sta *lq_sta)
348{
349 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
350 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
351 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
352 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
353
354 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
355 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
356
357 if (lq_sta->dbg_fixed_rate) {
358 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
359 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
360 }
361}
362#endif
363
364/*
365 get the traffic load value for tid
366*/
367static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
368{
369 u32 curr_time = jiffies_to_msecs(jiffies);
370 u32 time_diff;
371 s32 index;
372 struct iwl_traffic_load *tl = NULL;
373
374 if (tid >= IWL_MAX_TID_COUNT)
375 return 0;
376
377 tl = &(lq_data->load[tid]);
378
379 curr_time -= curr_time % TID_ROUND_VALUE;
380
381 if (!(tl->queue_count))
382 return 0;
383
384 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
385 index = time_diff / TID_QUEUE_CELL_SPACING;
386
387 /* The history is too long: remove data that is older than */
388 /* TID_MAX_TIME_DIFF */
389 if (index >= TID_QUEUE_MAX_SIZE)
390 rs_tl_rm_old_stats(tl, curr_time);
391
392 return tl->total;
393}
394
395static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
396 struct iwl_lq_sta *lq_data, u8 tid,
397 struct ieee80211_sta *sta)
398{
399 int ret = -EAGAIN;
400 u32 load;
401
402 load = rs_tl_get_load(lq_data, tid);
403
7c8e4159
EG		 404 /*
405 * Don't create TX aggregation sessions when in high
406 * BT traffic, as they would just be disrupted by BT.
407 */
408 if (BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >= 2) {
409 IWL_DEBUG_COEX(mvm, "BT traffic (%d), no aggregation allowed\n",
410 BT_MBOX_MSG(&mvm->last_bt_notif,
411 3, TRAFFIC_LOAD));
412 return ret;
413 }
414
8ca151b5
JB		 415 if ((iwlwifi_mod_params.auto_agg) || (load > IWL_AGG_LOAD_THRESHOLD)) {
416 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
417 sta->addr, tid);
418 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
419 if (ret == -EAGAIN) {
420 /*
421 * driver and mac80211 is out of sync
422 * this might be cause by reloading firmware
423 * stop the tx ba session here
424 */
425 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
426 tid);
427 ieee80211_stop_tx_ba_session(sta, tid);
428 }
429 } else {
430 IWL_DEBUG_HT(mvm,
431 "Aggregation not enabled for tid %d because load = %u\n",
432 tid, load);
433 }
434 return ret;
435}
436
437static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
438 struct iwl_lq_sta *lq_data,
439 struct ieee80211_sta *sta)
440{
441 if (tid < IWL_MAX_TID_COUNT)
442 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
443 else
444 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
445 tid, IWL_MAX_TID_COUNT);
446}
447
448static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
449{
450 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
451 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
452 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
453}
454
455/*
456 * Static function to get the expected throughput from an iwl_scale_tbl_info
457 * that wraps a NULL pointer check
458 */
459static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
460{
461 if (tbl->expected_tpt)
462 return tbl->expected_tpt[rs_index];
463 return 0;
464}
465
466/**
467 * rs_collect_tx_data - Update the success/failure sliding window
468 *
469 * We keep a sliding window of the last 62 packets transmitted
470 * at this rate. window->data contains the bitmask of successful
471 * packets.
472 */
473static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
474 int scale_index, int attempts, int successes)
475{
476 struct iwl_rate_scale_data *window = NULL;
477 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
478 s32 fail_count, tpt;
479
480 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
481 return -EINVAL;
482
483 /* Select window for current tx bit rate */
484 window = &(tbl->win[scale_index]);
485
486 /* Get expected throughput */
487 tpt = get_expected_tpt(tbl, scale_index);
488
489 /*
490 * Keep track of only the latest 62 tx frame attempts in this rate's
491 * history window; anything older isn't really relevant any more.
492 * If we have filled up the sliding window, drop the oldest attempt;
493 * if the oldest attempt (highest bit in bitmap) shows "success",
494 * subtract "1" from the success counter (this is the main reason
495 * we keep these bitmaps!).
496 */
497 while (attempts > 0) {
498 if (window->counter >= IWL_RATE_MAX_WINDOW) {
499 /* remove earliest */
500 window->counter = IWL_RATE_MAX_WINDOW - 1;
501
502 if (window->data & mask) {
503 window->data &= ~mask;
504 window->success_counter--;
505 }
506 }
507
508 /* Increment frames-attempted counter */
509 window->counter++;
510
511 /* Shift bitmap by one frame to throw away oldest history */
512 window->data <<= 1;
513
514 /* Mark the most recent #successes attempts as successful */
515 if (successes > 0) {
516 window->success_counter++;
517 window->data |= 0x1;
518 successes--;
519 }
520
521 attempts--;
522 }
523
524 /* Calculate current success ratio, avoid divide-by-0! */
525 if (window->counter > 0)
526 window->success_ratio = 128 * (100 * window->success_counter)
527 / window->counter;
528 else
529 window->success_ratio = IWL_INVALID_VALUE;
530
531 fail_count = window->counter - window->success_counter;
532
533 /* Calculate average throughput, if we have enough history. */
534 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
535 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
536 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
537 else
538 window->average_tpt = IWL_INVALID_VALUE;
539
540 /* Tag this window as having been updated */
541 window->stamp = jiffies;
542
543 return 0;
544}
545
546/*
547 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
548 */
549/* FIXME:RS:remove this function and put the flags statically in the table */
550static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm,
551 struct iwl_scale_tbl_info *tbl,
552 int index, u8 use_green)
553{
554 u32 rate_n_flags = 0;
555
556 if (is_legacy(tbl->lq_type)) {
557 rate_n_flags = iwl_rates[index].plcp;
558 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
559 rate_n_flags |= RATE_MCS_CCK_MSK;
560 } else if (is_Ht(tbl->lq_type)) {
561 if (index > IWL_LAST_OFDM_RATE) {
562 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
563 index = IWL_LAST_OFDM_RATE;
564 }
565 rate_n_flags = RATE_MCS_HT_MSK;
566
567 if (is_siso(tbl->lq_type))
568 rate_n_flags |= iwl_rates[index].plcp_siso;
569 else if (is_mimo2(tbl->lq_type))
570 rate_n_flags |= iwl_rates[index].plcp_mimo2;
571 else
572 rate_n_flags |= iwl_rates[index].plcp_mimo3;
573 } else {
574 IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type);
575 }
576
577 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
578 RATE_MCS_ANT_ABC_MSK);
579
580 if (is_Ht(tbl->lq_type)) {
581 if (tbl->is_ht40)
582 rate_n_flags |= RATE_MCS_CHAN_WIDTH_40;
583 if (tbl->is_SGI)
584 rate_n_flags |= RATE_MCS_SGI_MSK;
585
586 if (use_green) {
587 rate_n_flags |= RATE_HT_MCS_GF_MSK;
588 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
589 rate_n_flags &= ~RATE_MCS_SGI_MSK;
590 IWL_ERR(mvm, "GF was set with SGI:SISO\n");
591 }
592 }
593 }
594 return rate_n_flags;
595}
596
597/*
598 * Interpret uCode API's rate_n_flags format,
599 * fill "search" or "active" tx mode table.
600 */
601static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
602 enum ieee80211_band band,
603 struct iwl_scale_tbl_info *tbl,
604 int *rate_idx)
605{
606 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
607 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
608 u8 mcs;
609
610 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
611 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
612
613 if (*rate_idx == IWL_RATE_INVALID) {
614 *rate_idx = -1;
615 return -EINVAL;
616 }
617 tbl->is_SGI = 0; /* default legacy setup */
618 tbl->is_ht40 = 0;
619 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
620 tbl->lq_type = LQ_NONE;
621 tbl->max_search = IWL_MAX_SEARCH;
622
623 /* legacy rate format */
624 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
625 if (num_of_ant == 1) {
626 if (band == IEEE80211_BAND_5GHZ)
627 tbl->lq_type = LQ_A;
628 else
629 tbl->lq_type = LQ_G;
630 }
631 /* HT rate format */
632 } else {
633 if (rate_n_flags & RATE_MCS_SGI_MSK)
634 tbl->is_SGI = 1;
635
636 if (rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
637 tbl->is_ht40 = 1;
638
639 mcs = rs_extract_rate(rate_n_flags);
640
641 /* SISO */
642 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
643 if (num_of_ant == 1)
644 tbl->lq_type = LQ_SISO; /*else NONE*/
645 /* MIMO2 */
646 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
647 if (num_of_ant == 2)
648 tbl->lq_type = LQ_MIMO2;
649 /* MIMO3 */
650 } else {
651 if (num_of_ant == 3) {
652 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
653 tbl->lq_type = LQ_MIMO3;
654 }
655 }
656 }
657 return 0;
658}
659
660/* switch to another antenna/antennas and return 1 */
661/* if no other valid antenna found, return 0 */
662static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
663 struct iwl_scale_tbl_info *tbl)
664{
665 u8 new_ant_type;
666
667 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
668 return 0;
669
670 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
671 return 0;
672
673 new_ant_type = ant_toggle_lookup[tbl->ant_type];
674
675 while ((new_ant_type != tbl->ant_type) &&
676 !rs_is_valid_ant(valid_ant, new_ant_type))
677 new_ant_type = ant_toggle_lookup[new_ant_type];
678
679 if (new_ant_type == tbl->ant_type)
680 return 0;
681
682 tbl->ant_type = new_ant_type;
683 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
684 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
685 return 1;
686}
687
688/**
689 * Green-field mode is valid if the station supports it and
690 * there are no non-GF stations present in the BSS.
691 */
692static bool rs_use_green(struct ieee80211_sta *sta)
693{
6e6cc9f3
BL		 694 /*
695 * There's a bug somewhere in this code that causes the
696 * scaling to get stuck because GF+SGI can't be combined
697 * in SISO rates. Until we find that bug, disable GF, it
698 * has only limited benefit and we still interoperate with
699 * GF APs since we can always receive GF transmissions.
700 */
701 return false;
8ca151b5
JB		 702}
703
704/**
705 * rs_get_supported_rates - get the available rates
706 *
707 * if management frame or broadcast frame only return
708 * basic available rates.
709 *
710 */
711static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
712 struct ieee80211_hdr *hdr,
713 enum iwl_table_type rate_type)
714{
715 if (is_legacy(rate_type)) {
716 return lq_sta->active_legacy_rate;
717 } else {
718 if (is_siso(rate_type))
719 return lq_sta->active_siso_rate;
720 else if (is_mimo2(rate_type))
721 return lq_sta->active_mimo2_rate;
722 else
723 return lq_sta->active_mimo3_rate;
724 }
725}
726
727static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
728 int rate_type)
729{
730 u8 high = IWL_RATE_INVALID;
731 u8 low = IWL_RATE_INVALID;
732
733 /* 802.11A or ht walks to the next literal adjacent rate in
734 * the rate table */
735 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
736 int i;
737 u32 mask;
738
739 /* Find the previous rate that is in the rate mask */
740 i = index - 1;
741 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
742 if (rate_mask & mask) {
743 low = i;
744 break;
745 }
746 }
747
748 /* Find the next rate that is in the rate mask */
749 i = index + 1;
750 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
751 if (rate_mask & mask) {
752 high = i;
753 break;
754 }
755 }
756
757 return (high << 8) | low;
758 }
759
760 low = index;
761 while (low != IWL_RATE_INVALID) {
762 low = iwl_rates[low].prev_rs;
763 if (low == IWL_RATE_INVALID)
764 break;
765 if (rate_mask & (1 << low))
766 break;
767 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
768 }
769
770 high = index;
771 while (high != IWL_RATE_INVALID) {
772 high = iwl_rates[high].next_rs;
773 if (high == IWL_RATE_INVALID)
774 break;
775 if (rate_mask & (1 << high))
776 break;
777 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
778 }
779
780 return (high << 8) | low;
781}
782
783static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
784 struct iwl_scale_tbl_info *tbl,
785 u8 scale_index, u8 ht_possible)
786{
787 s32 low;
788 u16 rate_mask;
789 u16 high_low;
790 u8 switch_to_legacy = 0;
791 u8 is_green = lq_sta->is_green;
792 struct iwl_mvm *mvm = lq_sta->drv;
793
794 /* check if we need to switch from HT to legacy rates.
795 * assumption is that mandatory rates (1Mbps or 6Mbps)
796 * are always supported (spec demand) */
797 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
798 switch_to_legacy = 1;
799 scale_index = rs_ht_to_legacy[scale_index];
800 if (lq_sta->band == IEEE80211_BAND_5GHZ)
801 tbl->lq_type = LQ_A;
802 else
803 tbl->lq_type = LQ_G;
804
805 if (num_of_ant(tbl->ant_type) > 1)
806 tbl->ant_type =
ff402312 807 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
8ca151b5
JB		 808
809 tbl->is_ht40 = 0;
810 tbl->is_SGI = 0;
811 tbl->max_search = IWL_MAX_SEARCH;
812 }
813
814 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
815
816 /* Mask with station rate restriction */
817 if (is_legacy(tbl->lq_type)) {
818 /* supp_rates has no CCK bits in A mode */
819 if (lq_sta->band == IEEE80211_BAND_5GHZ)
820 rate_mask = (u16)(rate_mask &
821 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
822 else
823 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
824 }
825
826 /* If we switched from HT to legacy, check current rate */
827 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
828 low = scale_index;
829 goto out;
830 }
831
832 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
833 tbl->lq_type);
834 low = high_low & 0xff;
835
836 if (low == IWL_RATE_INVALID)
837 low = scale_index;
838
839out:
840 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
841}
842
843/*
844 * Simple function to compare two rate scale table types
845 */
846static bool table_type_matches(struct iwl_scale_tbl_info *a,
847 struct iwl_scale_tbl_info *b)
848{
849 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
850 (a->is_SGI == b->is_SGI);
851}
852
853/*
854 * mac80211 sends us Tx status
855 */
856static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
857 struct ieee80211_sta *sta, void *priv_sta,
858 struct sk_buff *skb)
859{
860 int legacy_success;
861 int retries;
862 int rs_index, mac_index, i;
863 struct iwl_lq_sta *lq_sta = priv_sta;
864 struct iwl_lq_cmd *table;
865 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
866 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
867 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
868 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
869 enum mac80211_rate_control_flags mac_flags;
870 u32 tx_rate;
871 struct iwl_scale_tbl_info tbl_type;
872 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
873
874 IWL_DEBUG_RATE_LIMIT(mvm,
875 "get frame ack response, update rate scale window\n");
876
877 /* Treat uninitialized rate scaling data same as non-existing. */
878 if (!lq_sta) {
879 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
880 return;
881 } else if (!lq_sta->drv) {
882 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
883 return;
884 }
885
886 if (!ieee80211_is_data(hdr->frame_control) ||
887 info->flags & IEEE80211_TX_CTL_NO_ACK)
888 return;
889
890 /* This packet was aggregated but doesn't carry status info */
891 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
892 !(info->flags & IEEE80211_TX_STAT_AMPDU))
893 return;
894
895 /*
896 * Ignore this Tx frame response if its initial rate doesn't match
897 * that of latest Link Quality command. There may be stragglers
898 * from a previous Link Quality command, but we're no longer interested
899 * in those; they're either from the "active" mode while we're trying
900 * to check "search" mode, or a prior "search" mode after we've moved
901 * to a new "search" mode (which might become the new "active" mode).
902 */
903 table = &lq_sta->lq;
904 tx_rate = le32_to_cpu(table->rs_table[0]);
905 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index);
906 if (info->band == IEEE80211_BAND_5GHZ)
907 rs_index -= IWL_FIRST_OFDM_RATE;
908 mac_flags = info->status.rates[0].flags;
909 mac_index = info->status.rates[0].idx;
910 /* For HT packets, map MCS to PLCP */
911 if (mac_flags & IEEE80211_TX_RC_MCS) {
912 /* Remove # of streams */
913 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
914 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
915 mac_index++;
916 /*
917 * mac80211 HT index is always zero-indexed; we need to move
918 * HT OFDM rates after CCK rates in 2.4 GHz band
919 */
920 if (info->band == IEEE80211_BAND_2GHZ)
921 mac_index += IWL_FIRST_OFDM_RATE;
922 }
923 /* Here we actually compare this rate to the latest LQ command */
924 if ((mac_index < 0) ||
925 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
926 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
927 (tbl_type.ant_type != info->status.antenna) ||
928 (!!(tx_rate & RATE_MCS_HT_MSK) !=
929 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
930 (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
931 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
932 (rs_index != mac_index)) {
933 IWL_DEBUG_RATE(mvm,
934 "initial rate %d does not match %d (0x%x)\n",
935 mac_index, rs_index, tx_rate);
936 /*
937 * Since rates mis-match, the last LQ command may have failed.
938 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
939 * ... driver.
940 */
941 lq_sta->missed_rate_counter++;
942 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
943 lq_sta->missed_rate_counter = 0;
944 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
945 }
946 /* Regardless, ignore this status info for outdated rate */
947 return;
948 } else
949 /* Rate did match, so reset the missed_rate_counter */
950 lq_sta->missed_rate_counter = 0;
951
952 /* Figure out if rate scale algorithm is in active or search table */
953 if (table_type_matches(&tbl_type,
954 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
955 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
956 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
957 } else if (table_type_matches(
958 &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
959 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
960 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
961 } else {
962 IWL_DEBUG_RATE(mvm,
963 "Neither active nor search matches tx rate\n");
964 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
965 IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n",
966 tmp_tbl->lq_type, tmp_tbl->ant_type,
967 tmp_tbl->is_SGI);
968 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
969 IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n",
970 tmp_tbl->lq_type, tmp_tbl->ant_type,
971 tmp_tbl->is_SGI);
972 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
973 tbl_type.lq_type, tbl_type.ant_type,
974 tbl_type.is_SGI);
975 /*
976 * no matching table found, let's by-pass the data collection
977 * and continue to perform rate scale to find the rate table
978 */
979 rs_stay_in_table(lq_sta, true);
980 goto done;
981 }
982
983 /*
984 * Updating the frame history depends on whether packets were
985 * aggregated.
986 *
987 * For aggregation, all packets were transmitted at the same rate, the
988 * first index into rate scale table.
989 */
990 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
991 tx_rate = le32_to_cpu(table->rs_table[0]);
992 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type,
993 &rs_index);
994 rs_collect_tx_data(curr_tbl, rs_index,
995 info->status.ampdu_len,
996 info->status.ampdu_ack_len);
997
998 /* Update success/fail counts if not searching for new mode */
999 if (lq_sta->stay_in_tbl) {
1000 lq_sta->total_success += info->status.ampdu_ack_len;
1001 lq_sta->total_failed += (info->status.ampdu_len -
1002 info->status.ampdu_ack_len);
1003 }
1004 } else {
1005 /*
1006 * For legacy, update frame history with for each Tx retry.
1007 */
1008 retries = info->status.rates[0].count - 1;
1009 /* HW doesn't send more than 15 retries */
1010 retries = min(retries, 15);
1011
1012 /* The last transmission may have been successful */
1013 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1014 /* Collect data for each rate used during failed TX attempts */
1015 for (i = 0; i <= retries; ++i) {
1016 tx_rate = le32_to_cpu(table->rs_table[i]);
1017 rs_get_tbl_info_from_mcs(tx_rate, info->band,
1018 &tbl_type, &rs_index);
1019 /*
1020 * Only collect stats if retried rate is in the same RS
1021 * table as active/search.
1022 */
1023 if (table_type_matches(&tbl_type, curr_tbl))
1024 tmp_tbl = curr_tbl;
1025 else if (table_type_matches(&tbl_type, other_tbl))
1026 tmp_tbl = other_tbl;
1027 else
1028 continue;
1029 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1030 i < retries ? 0 : legacy_success);
1031 }
1032
1033 /* Update success/fail counts if not searching for new mode */
1034 if (lq_sta->stay_in_tbl) {
1035 lq_sta->total_success += legacy_success;
1036 lq_sta->total_failed += retries + (1 - legacy_success);
1037 }
1038 }
1039 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1040 lq_sta->last_rate_n_flags = tx_rate;
1041done:
1042 /* See if there's a better rate or modulation mode to try. */
1043 if (sta && sta->supp_rates[sband->band])
1044 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
1045}
1046
1047/*
1048 * Begin a period of staying with a selected modulation mode.
1049 * Set "stay_in_tbl" flag to prevent any mode switches.
1050 * Set frame tx success limits according to legacy vs. high-throughput,
1051 * and reset overall (spanning all rates) tx success history statistics.
1052 * These control how long we stay using same modulation mode before
1053 * searching for a new mode.
1054 */
1055static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1056 struct iwl_lq_sta *lq_sta)
1057{
1058 IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
1059 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1060 if (is_legacy) {
1061 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1062 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1063 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1064 } else {
1065 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1066 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1067 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1068 }
1069 lq_sta->table_count = 0;
1070 lq_sta->total_failed = 0;
1071 lq_sta->total_success = 0;
1072 lq_sta->flush_timer = jiffies;
1073 lq_sta->action_counter = 0;
1074}
1075
1076/*
1077 * Find correct throughput table for given mode of modulation
1078 */
1079static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1080 struct iwl_scale_tbl_info *tbl)
1081{
1082 /* Used to choose among HT tables */
1083 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1084
1085 /* Check for invalid LQ type */
1086 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1087 tbl->expected_tpt = expected_tpt_legacy;
1088 return;
1089 }
1090
1091 /* Legacy rates have only one table */
1092 if (is_legacy(tbl->lq_type)) {
1093 tbl->expected_tpt = expected_tpt_legacy;
1094 return;
1095 }
1096
1097 /* Choose among many HT tables depending on number of streams
1098 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1099 * status */
1100 if (is_siso(tbl->lq_type) && !tbl->is_ht40)
1101 ht_tbl_pointer = expected_tpt_siso20MHz;
1102 else if (is_siso(tbl->lq_type))
1103 ht_tbl_pointer = expected_tpt_siso40MHz;
1104 else if (is_mimo2(tbl->lq_type) && !tbl->is_ht40)
1105 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1106 else if (is_mimo2(tbl->lq_type))
1107 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1108 else if (is_mimo3(tbl->lq_type) && !tbl->is_ht40)
1109 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1110 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1111 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1112
1113 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1114 tbl->expected_tpt = ht_tbl_pointer[0];
1115 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1116 tbl->expected_tpt = ht_tbl_pointer[1];
1117 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1118 tbl->expected_tpt = ht_tbl_pointer[2];
1119 else /* AGG+SGI */
1120 tbl->expected_tpt = ht_tbl_pointer[3];
1121}
1122
1123/*
1124 * Find starting rate for new "search" high-throughput mode of modulation.
1125 * Goal is to find lowest expected rate (under perfect conditions) that is
1126 * above the current measured throughput of "active" mode, to give new mode
1127 * a fair chance to prove itself without too many challenges.
1128 *
1129 * This gets called when transitioning to more aggressive modulation
1130 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1131 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1132 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1133 * bit rate will typically need to increase, but not if performance was bad.
1134 */
1135static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1136 struct iwl_lq_sta *lq_sta,
1137 struct iwl_scale_tbl_info *tbl, /* "search" */
1138 u16 rate_mask, s8 index)
1139{
1140 /* "active" values */
1141 struct iwl_scale_tbl_info *active_tbl =
1142 &(lq_sta->lq_info[lq_sta->active_tbl]);
1143 s32 active_sr = active_tbl->win[index].success_ratio;
1144 s32 active_tpt = active_tbl->expected_tpt[index];
1145
1146 /* expected "search" throughput */
1147 s32 *tpt_tbl = tbl->expected_tpt;
1148
1149 s32 new_rate, high, low, start_hi;
1150 u16 high_low;
1151 s8 rate = index;
1152
1153 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1154
1155 while (1) {
1156 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1157 tbl->lq_type);
1158
1159 low = high_low & 0xff;
1160 high = (high_low >> 8) & 0xff;
1161
1162 /*
1163 * Lower the "search" bit rate, to give new "search" mode
1164 * approximately the same throughput as "active" if:
1165 *
1166 * 1) "Active" mode has been working modestly well (but not
1167 * great), and expected "search" throughput (under perfect
1168 * conditions) at candidate rate is above the actual
1169 * measured "active" throughput (but less than expected
1170 * "active" throughput under perfect conditions).
1171 * OR
1172 * 2) "Active" mode has been working perfectly or very well
1173 * and expected "search" throughput (under perfect
1174 * conditions) at candidate rate is above expected
1175 * "active" throughput (under perfect conditions).
1176 */
1177 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1178 ((active_sr > IWL_RATE_DECREASE_TH) &&
1179 (active_sr <= IWL_RATE_HIGH_TH) &&
1180 (tpt_tbl[rate] <= active_tpt))) ||
1181 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1182 (tpt_tbl[rate] > active_tpt))) {
1183 /* (2nd or later pass)
1184 * If we've already tried to raise the rate, and are
1185 * now trying to lower it, use the higher rate. */
1186 if (start_hi != IWL_RATE_INVALID) {
1187 new_rate = start_hi;
1188 break;
1189 }
1190
1191 new_rate = rate;
1192
1193 /* Loop again with lower rate */
1194 if (low != IWL_RATE_INVALID)
1195 rate = low;
1196
1197 /* Lower rate not available, use the original */
1198 else
1199 break;
1200
1201 /* Else try to raise the "search" rate to match "active" */
1202 } else {
1203 /* (2nd or later pass)
1204 * If we've already tried to lower the rate, and are
1205 * now trying to raise it, use the lower rate. */
1206 if (new_rate != IWL_RATE_INVALID)
1207 break;
1208
1209 /* Loop again with higher rate */
1210 else if (high != IWL_RATE_INVALID) {
1211 start_hi = high;
1212 rate = high;
1213
1214 /* Higher rate not available, use the original */
1215 } else {
1216 new_rate = rate;
1217 break;
1218 }
1219 }
1220 }
1221
1222 return new_rate;
1223}
1224
e1a0c6b3 1225static bool iwl_is_ht40_tx_allowed(struct ieee80211_sta *sta)
8ca151b5 1226{
e1a0c6b3 1227 return sta->bandwidth >= IEEE80211_STA_RX_BW_40;
8ca151b5
JB		 1228}
1229
1230/*
1231 * Set up search table for MIMO2
1232 */
1233static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1234 struct iwl_lq_sta *lq_sta,
1235 struct ieee80211_sta *sta,
1236 struct iwl_scale_tbl_info *tbl, int index)
1237{
1238 u16 rate_mask;
1239 s32 rate;
1240 s8 is_green = lq_sta->is_green;
1241
1242 if (!sta->ht_cap.ht_supported)
1243 return -1;
1244
af0ed69b 1245 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
8ca151b5
JB		 1246 return -1;
1247
1248 /* Need both Tx chains/antennas to support MIMO */
ff402312 1249 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
8ca151b5
JB		 1250 return -1;
1251
1252 IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1253
1254 tbl->lq_type = LQ_MIMO2;
1255 tbl->action = 0;
1256 tbl->max_search = IWL_MAX_SEARCH;
1257 rate_mask = lq_sta->active_mimo2_rate;
1258
e1a0c6b3 1259 if (iwl_is_ht40_tx_allowed(sta))
8ca151b5
JB		 1260 tbl->is_ht40 = 1;
1261 else
1262 tbl->is_ht40 = 0;
1263
1264 rs_set_expected_tpt_table(lq_sta, tbl);
1265
1266 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1267
1268 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
1269 rate, rate_mask);
1270 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1271 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1272 rate, rate_mask);
1273 return -1;
1274 }
1275 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1276
1277 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1278 tbl->current_rate, is_green);
1279 return 0;
1280}
1281
1282/*
1283 * Set up search table for MIMO3
1284 */
1285static int rs_switch_to_mimo3(struct iwl_mvm *mvm,
1286 struct iwl_lq_sta *lq_sta,
1287 struct ieee80211_sta *sta,
1288 struct iwl_scale_tbl_info *tbl, int index)
1289{
1290 u16 rate_mask;
1291 s32 rate;
1292 s8 is_green = lq_sta->is_green;
1293
1294 if (!sta->ht_cap.ht_supported)
1295 return -1;
1296
af0ed69b 1297 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
8ca151b5
JB		 1298 return -1;
1299
1300 /* Need both Tx chains/antennas to support MIMO */
ff402312 1301 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 3)
8ca151b5
JB		 1302 return -1;
1303
1304 IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO3\n");
1305
1306 tbl->lq_type = LQ_MIMO3;
1307 tbl->action = 0;
1308 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1309 rate_mask = lq_sta->active_mimo3_rate;
1310
e1a0c6b3 1311 if (iwl_is_ht40_tx_allowed(sta))
8ca151b5
JB		 1312 tbl->is_ht40 = 1;
1313 else
1314 tbl->is_ht40 = 0;
1315
1316 rs_set_expected_tpt_table(lq_sta, tbl);
1317
1318 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1319
1320 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 best rate %d mask %X\n",
1321 rate, rate_mask);
1322 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1323 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1324 rate, rate_mask);
1325 return -1;
1326 }
1327 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1328
1329 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1330 tbl->current_rate, is_green);
1331 return 0;
1332}
1333
1334/*
1335 * Set up search table for SISO
1336 */
1337static int rs_switch_to_siso(struct iwl_mvm *mvm,
1338 struct iwl_lq_sta *lq_sta,
1339 struct ieee80211_sta *sta,
1340 struct iwl_scale_tbl_info *tbl, int index)
1341{
1342 u16 rate_mask;
1343 u8 is_green = lq_sta->is_green;
1344 s32 rate;
1345
1346 if (!sta->ht_cap.ht_supported)
1347 return -1;
1348
1349 IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1350
1351 tbl->lq_type = LQ_SISO;
1352 tbl->action = 0;
1353 tbl->max_search = IWL_MAX_SEARCH;
1354 rate_mask = lq_sta->active_siso_rate;
1355
e1a0c6b3 1356 if (iwl_is_ht40_tx_allowed(sta))
8ca151b5
JB		 1357 tbl->is_ht40 = 1;
1358 else
1359 tbl->is_ht40 = 0;
1360
1361 if (is_green)
1362 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1363
1364 rs_set_expected_tpt_table(lq_sta, tbl);
1365 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1366
1367 IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1368 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1369 IWL_DEBUG_RATE(mvm,
1370 "can not switch with index %d rate mask %x\n",
1371 rate, rate_mask);
1372 return -1;
1373 }
1374 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate, is_green);
1375 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index is green %X\n",
1376 tbl->current_rate, is_green);
1377 return 0;
1378}
1379
1380/*
1381 * Try to switch to new modulation mode from legacy
1382 */
1383static int rs_move_legacy_other(struct iwl_mvm *mvm,
1384 struct iwl_lq_sta *lq_sta,
1385 struct ieee80211_sta *sta,
1386 int index)
1387{
1388 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1389 struct iwl_scale_tbl_info *search_tbl =
1390 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1391 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1392 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1393 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1394 u8 start_action;
ff402312 1395 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1396 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1397 int ret;
1398 u8 update_search_tbl_counter = 0;
1399
1400 start_action = tbl->action;
1401 while (1) {
1402 lq_sta->action_counter++;
1403 switch (tbl->action) {
1404 case IWL_LEGACY_SWITCH_ANTENNA1:
1405 case IWL_LEGACY_SWITCH_ANTENNA2:
1406 IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1407
1408 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1409 tx_chains_num <= 1) ||
1410 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1411 tx_chains_num <= 2))
1412 break;
1413
1414 /* Don't change antenna if success has been great */
1415 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1416 break;
1417
1418 /* Set up search table to try other antenna */
1419 memcpy(search_tbl, tbl, sz);
1420
1421 if (rs_toggle_antenna(valid_tx_ant,
1422 &search_tbl->current_rate,
1423 search_tbl)) {
1424 update_search_tbl_counter = 1;
1425 rs_set_expected_tpt_table(lq_sta, search_tbl);
1426 goto out;
1427 }
1428 break;
1429 case IWL_LEGACY_SWITCH_SISO:
1430 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1431
1432 /* Set up search table to try SISO */
1433 memcpy(search_tbl, tbl, sz);
1434 search_tbl->is_SGI = 0;
1435 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1436 search_tbl, index);
1437 if (!ret) {
1438 lq_sta->action_counter = 0;
1439 goto out;
1440 }
1441
1442 break;
1443 case IWL_LEGACY_SWITCH_MIMO2_AB:
1444 case IWL_LEGACY_SWITCH_MIMO2_AC:
1445 case IWL_LEGACY_SWITCH_MIMO2_BC:
1446 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1447
1448 /* Set up search table to try MIMO */
1449 memcpy(search_tbl, tbl, sz);
1450 search_tbl->is_SGI = 0;
1451
1452 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1453 search_tbl->ant_type = ANT_AB;
1454 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1455 search_tbl->ant_type = ANT_AC;
1456 else
1457 search_tbl->ant_type = ANT_BC;
1458
1459 if (!rs_is_valid_ant(valid_tx_ant,
1460 search_tbl->ant_type))
1461 break;
1462
1463 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1464 search_tbl, index);
1465 if (!ret) {
1466 lq_sta->action_counter = 0;
1467 goto out;
1468 }
1469 break;
1470
1471 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1472 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO3\n");
1473
1474 /* Set up search table to try MIMO3 */
1475 memcpy(search_tbl, tbl, sz);
1476 search_tbl->is_SGI = 0;
1477
1478 search_tbl->ant_type = ANT_ABC;
1479
1480 if (!rs_is_valid_ant(valid_tx_ant,
1481 search_tbl->ant_type))
1482 break;
1483
1484 ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1485 search_tbl, index);
1486 if (!ret) {
1487 lq_sta->action_counter = 0;
1488 goto out;
1489 }
1490 break;
1491 }
1492 tbl->action++;
1493 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1494 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1495
1496 if (tbl->action == start_action)
1497 break;
1498 }
1499 search_tbl->lq_type = LQ_NONE;
1500 return 0;
1501
1502out:
1503 lq_sta->search_better_tbl = 1;
1504 tbl->action++;
1505 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1506 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1507 if (update_search_tbl_counter)
1508 search_tbl->action = tbl->action;
1509 return 0;
1510}
1511
1512/*
1513 * Try to switch to new modulation mode from SISO
1514 */
1515static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1516 struct iwl_lq_sta *lq_sta,
1517 struct ieee80211_sta *sta, int index)
1518{
1519 u8 is_green = lq_sta->is_green;
1520 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1521 struct iwl_scale_tbl_info *search_tbl =
1522 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1523 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1524 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1525 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1526 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1527 u8 start_action;
ff402312 1528 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1529 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1530 u8 update_search_tbl_counter = 0;
1531 int ret;
1532
1533 start_action = tbl->action;
1534 while (1) {
1535 lq_sta->action_counter++;
1536 switch (tbl->action) {
1537 case IWL_SISO_SWITCH_ANTENNA1:
1538 case IWL_SISO_SWITCH_ANTENNA2:
1539 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
1540 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1541 tx_chains_num <= 1) ||
1542 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1543 tx_chains_num <= 2))
1544 break;
1545
1546 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1547 break;
1548
1549 memcpy(search_tbl, tbl, sz);
1550 if (rs_toggle_antenna(valid_tx_ant,
1551 &search_tbl->current_rate,
1552 search_tbl)) {
1553 update_search_tbl_counter = 1;
1554 goto out;
1555 }
1556 break;
1557 case IWL_SISO_SWITCH_MIMO2_AB:
1558 case IWL_SISO_SWITCH_MIMO2_AC:
1559 case IWL_SISO_SWITCH_MIMO2_BC:
1560 IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1561 memcpy(search_tbl, tbl, sz);
1562 search_tbl->is_SGI = 0;
1563
1564 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1565 search_tbl->ant_type = ANT_AB;
1566 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1567 search_tbl->ant_type = ANT_AC;
1568 else
1569 search_tbl->ant_type = ANT_BC;
1570
1571 if (!rs_is_valid_ant(valid_tx_ant,
1572 search_tbl->ant_type))
1573 break;
1574
1575 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1576 search_tbl, index);
1577 if (!ret)
1578 goto out;
1579 break;
1580 case IWL_SISO_SWITCH_GI:
1581 if (!tbl->is_ht40 && !(ht_cap->cap &
1582 IEEE80211_HT_CAP_SGI_20))
1583 break;
1584 if (tbl->is_ht40 && !(ht_cap->cap &
1585 IEEE80211_HT_CAP_SGI_40))
1586 break;
1587
1588 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1589
1590 memcpy(search_tbl, tbl, sz);
1591 if (is_green) {
1592 if (!tbl->is_SGI)
1593 break;
1594 else
1595 IWL_ERR(mvm,
1596 "SGI was set in GF+SISO\n");
1597 }
1598 search_tbl->is_SGI = !tbl->is_SGI;
1599 rs_set_expected_tpt_table(lq_sta, search_tbl);
1600 if (tbl->is_SGI) {
1601 s32 tpt = lq_sta->last_tpt / 100;
1602 if (tpt >= search_tbl->expected_tpt[index])
1603 break;
1604 }
1605 search_tbl->current_rate =
1606 rate_n_flags_from_tbl(mvm, search_tbl,
1607 index, is_green);
1608 update_search_tbl_counter = 1;
1609 goto out;
1610 case IWL_SISO_SWITCH_MIMO3_ABC:
1611 IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO3\n");
1612 memcpy(search_tbl, tbl, sz);
1613 search_tbl->is_SGI = 0;
1614 search_tbl->ant_type = ANT_ABC;
1615
1616 if (!rs_is_valid_ant(valid_tx_ant,
1617 search_tbl->ant_type))
1618 break;
1619
1620 ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1621 search_tbl, index);
1622 if (!ret)
1623 goto out;
1624 break;
1625 }
1626 tbl->action++;
1627 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1628 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1629
1630 if (tbl->action == start_action)
1631 break;
1632 }
1633 search_tbl->lq_type = LQ_NONE;
1634 return 0;
1635
1636 out:
1637 lq_sta->search_better_tbl = 1;
1638 tbl->action++;
1639 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1640 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1641 if (update_search_tbl_counter)
1642 search_tbl->action = tbl->action;
1643
1644 return 0;
1645}
1646
1647/*
1648 * Try to switch to new modulation mode from MIMO2
1649 */
1650static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1651 struct iwl_lq_sta *lq_sta,
1652 struct ieee80211_sta *sta, int index)
1653{
1654 s8 is_green = lq_sta->is_green;
1655 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1656 struct iwl_scale_tbl_info *search_tbl =
1657 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1658 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1659 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1660 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1661 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1662 u8 start_action;
ff402312 1663 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1664 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1665 u8 update_search_tbl_counter = 0;
1666 int ret;
1667
1668 start_action = tbl->action;
1669 while (1) {
1670 lq_sta->action_counter++;
1671 switch (tbl->action) {
1672 case IWL_MIMO2_SWITCH_ANTENNA1:
1673 case IWL_MIMO2_SWITCH_ANTENNA2:
1674 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle Antennas\n");
1675
1676 if (tx_chains_num <= 2)
1677 break;
1678
1679 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1680 break;
1681
1682 memcpy(search_tbl, tbl, sz);
1683 if (rs_toggle_antenna(valid_tx_ant,
1684 &search_tbl->current_rate,
1685 search_tbl)) {
1686 update_search_tbl_counter = 1;
1687 goto out;
1688 }
1689 break;
1690 case IWL_MIMO2_SWITCH_SISO_A:
1691 case IWL_MIMO2_SWITCH_SISO_B:
1692 case IWL_MIMO2_SWITCH_SISO_C:
1693 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1694
1695 /* Set up new search table for SISO */
1696 memcpy(search_tbl, tbl, sz);
1697
1698 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1699 search_tbl->ant_type = ANT_A;
1700 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1701 search_tbl->ant_type = ANT_B;
1702 else
1703 search_tbl->ant_type = ANT_C;
1704
1705 if (!rs_is_valid_ant(valid_tx_ant,
1706 search_tbl->ant_type))
1707 break;
1708
1709 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1710 search_tbl, index);
1711 if (!ret)
1712 goto out;
1713
1714 break;
1715
1716 case IWL_MIMO2_SWITCH_GI:
1717 if (!tbl->is_ht40 && !(ht_cap->cap &
1718 IEEE80211_HT_CAP_SGI_20))
1719 break;
1720 if (tbl->is_ht40 && !(ht_cap->cap &
1721 IEEE80211_HT_CAP_SGI_40))
1722 break;
1723
1724 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1725
1726 /* Set up new search table for MIMO2 */
1727 memcpy(search_tbl, tbl, sz);
1728 search_tbl->is_SGI = !tbl->is_SGI;
1729 rs_set_expected_tpt_table(lq_sta, search_tbl);
1730 /*
1731 * If active table already uses the fastest possible
1732 * modulation (dual stream with short guard interval),
1733 * and it's working well, there's no need to look
1734 * for a better type of modulation!
1735 */
1736 if (tbl->is_SGI) {
1737 s32 tpt = lq_sta->last_tpt / 100;
1738 if (tpt >= search_tbl->expected_tpt[index])
1739 break;
1740 }
1741 search_tbl->current_rate =
1742 rate_n_flags_from_tbl(mvm, search_tbl,
1743 index, is_green);
1744 update_search_tbl_counter = 1;
1745 goto out;
1746
1747 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1748 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to MIMO3\n");
1749 memcpy(search_tbl, tbl, sz);
1750 search_tbl->is_SGI = 0;
1751 search_tbl->ant_type = ANT_ABC;
1752
1753 if (!rs_is_valid_ant(valid_tx_ant,
1754 search_tbl->ant_type))
1755 break;
1756
1757 ret = rs_switch_to_mimo3(mvm, lq_sta, sta,
1758 search_tbl, index);
1759 if (!ret)
1760 goto out;
1761
1762 break;
1763 }
1764 tbl->action++;
1765 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1766 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1767
1768 if (tbl->action == start_action)
1769 break;
1770 }
1771 search_tbl->lq_type = LQ_NONE;
1772 return 0;
1773 out:
1774 lq_sta->search_better_tbl = 1;
1775 tbl->action++;
1776 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1777 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1778 if (update_search_tbl_counter)
1779 search_tbl->action = tbl->action;
1780
1781 return 0;
1782}
1783
1784/*
1785 * Try to switch to new modulation mode from MIMO3
1786 */
1787static int rs_move_mimo3_to_other(struct iwl_mvm *mvm,
1788 struct iwl_lq_sta *lq_sta,
1789 struct ieee80211_sta *sta, int index)
1790{
1791 s8 is_green = lq_sta->is_green;
1792 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1793 struct iwl_scale_tbl_info *search_tbl =
1794 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1795 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1796 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1797 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1798 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1799 u8 start_action;
ff402312 1800 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1801 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1802 int ret;
1803 u8 update_search_tbl_counter = 0;
1804
1805 start_action = tbl->action;
1806 while (1) {
1807 lq_sta->action_counter++;
1808 switch (tbl->action) {
1809 case IWL_MIMO3_SWITCH_ANTENNA1:
1810 case IWL_MIMO3_SWITCH_ANTENNA2:
1811 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle Antennas\n");
1812
1813 if (tx_chains_num <= 3)
1814 break;
1815
1816 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1817 break;
1818
1819 memcpy(search_tbl, tbl, sz);
1820 if (rs_toggle_antenna(valid_tx_ant,
1821 &search_tbl->current_rate,
1822 search_tbl))
1823 goto out;
1824 break;
1825 case IWL_MIMO3_SWITCH_SISO_A:
1826 case IWL_MIMO3_SWITCH_SISO_B:
1827 case IWL_MIMO3_SWITCH_SISO_C:
1828 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to SISO\n");
1829
1830 /* Set up new search table for SISO */
1831 memcpy(search_tbl, tbl, sz);
1832
1833 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1834 search_tbl->ant_type = ANT_A;
1835 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1836 search_tbl->ant_type = ANT_B;
1837 else
1838 search_tbl->ant_type = ANT_C;
1839
1840 if (!rs_is_valid_ant(valid_tx_ant,
1841 search_tbl->ant_type))
1842 break;
1843
1844 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1845 search_tbl, index);
1846 if (!ret)
1847 goto out;
1848
1849 break;
1850
1851 case IWL_MIMO3_SWITCH_MIMO2_AB:
1852 case IWL_MIMO3_SWITCH_MIMO2_AC:
1853 case IWL_MIMO3_SWITCH_MIMO2_BC:
1854 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 switch to MIMO2\n");
1855
1856 memcpy(search_tbl, tbl, sz);
1857 search_tbl->is_SGI = 0;
1858 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1859 search_tbl->ant_type = ANT_AB;
1860 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1861 search_tbl->ant_type = ANT_AC;
1862 else
1863 search_tbl->ant_type = ANT_BC;
1864
1865 if (!rs_is_valid_ant(valid_tx_ant,
1866 search_tbl->ant_type))
1867 break;
1868
1869 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1870 search_tbl, index);
1871 if (!ret)
1872 goto out;
1873
1874 break;
1875
1876 case IWL_MIMO3_SWITCH_GI:
1877 if (!tbl->is_ht40 && !(ht_cap->cap &
1878 IEEE80211_HT_CAP_SGI_20))
1879 break;
1880 if (tbl->is_ht40 && !(ht_cap->cap &
1881 IEEE80211_HT_CAP_SGI_40))
1882 break;
1883
1884 IWL_DEBUG_RATE(mvm, "LQ: MIMO3 toggle SGI/NGI\n");
1885
1886 /* Set up new search table for MIMO */
1887 memcpy(search_tbl, tbl, sz);
1888 search_tbl->is_SGI = !tbl->is_SGI;
1889 rs_set_expected_tpt_table(lq_sta, search_tbl);
1890 /*
1891 * If active table already uses the fastest possible
1892 * modulation (dual stream with short guard interval),
1893 * and it's working well, there's no need to look
1894 * for a better type of modulation!
1895 */
1896 if (tbl->is_SGI) {
1897 s32 tpt = lq_sta->last_tpt / 100;
1898 if (tpt >= search_tbl->expected_tpt[index])
1899 break;
1900 }
1901 search_tbl->current_rate =
1902 rate_n_flags_from_tbl(mvm, search_tbl,
1903 index, is_green);
1904 update_search_tbl_counter = 1;
1905 goto out;
1906 }
1907 tbl->action++;
1908 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1909 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1910
1911 if (tbl->action == start_action)
1912 break;
1913 }
1914 search_tbl->lq_type = LQ_NONE;
1915 return 0;
1916 out:
1917 lq_sta->search_better_tbl = 1;
1918 tbl->action++;
1919 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1920 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1921 if (update_search_tbl_counter)
1922 search_tbl->action = tbl->action;
1923
1924 return 0;
1925}
1926
1927/*
1928 * Check whether we should continue using same modulation mode, or
1929 * begin search for a new mode, based on:
1930 * 1) # tx successes or failures while using this mode
1931 * 2) # times calling this function
1932 * 3) elapsed time in this mode (not used, for now)
1933 */
1934static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1935{
1936 struct iwl_scale_tbl_info *tbl;
1937 int i;
1938 int active_tbl;
1939 int flush_interval_passed = 0;
1940 struct iwl_mvm *mvm;
1941
1942 mvm = lq_sta->drv;
1943 active_tbl = lq_sta->active_tbl;
1944
1945 tbl = &(lq_sta->lq_info[active_tbl]);
1946
1947 /* If we've been disallowing search, see if we should now allow it */
1948 if (lq_sta->stay_in_tbl) {
1949 /* Elapsed time using current modulation mode */
1950 if (lq_sta->flush_timer)
1951 flush_interval_passed =
1952 time_after(jiffies,
1953 (unsigned long)(lq_sta->flush_timer +
1954 IWL_RATE_SCALE_FLUSH_INTVL));
1955
1956 /*
1957 * Check if we should allow search for new modulation mode.
1958 * If many frames have failed or succeeded, or we've used
1959 * this same modulation for a long time, allow search, and
1960 * reset history stats that keep track of whether we should
1961 * allow a new search. Also (below) reset all bitmaps and
1962 * stats in active history.
1963 */
1964 if (force_search ||
1965 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1966 (lq_sta->total_success > lq_sta->max_success_limit) ||
1967 ((!lq_sta->search_better_tbl) &&
1968 (lq_sta->flush_timer) && (flush_interval_passed))) {
1969 IWL_DEBUG_RATE(mvm,
1970 "LQ: stay is expired %d %d %d\n",
1971 lq_sta->total_failed,
1972 lq_sta->total_success,
1973 flush_interval_passed);
1974
1975 /* Allow search for new mode */
1976 lq_sta->stay_in_tbl = 0; /* only place reset */
1977 lq_sta->total_failed = 0;
1978 lq_sta->total_success = 0;
1979 lq_sta->flush_timer = 0;
1980 /*
1981 * Else if we've used this modulation mode enough repetitions
1982 * (regardless of elapsed time or success/failure), reset
1983 * history bitmaps and rate-specific stats for all rates in
1984 * active table.
1985 */
1986 } else {
1987 lq_sta->table_count++;
1988 if (lq_sta->table_count >=
1989 lq_sta->table_count_limit) {
1990 lq_sta->table_count = 0;
1991
1992 IWL_DEBUG_RATE(mvm,
1993 "LQ: stay in table clear win\n");
1994 for (i = 0; i < IWL_RATE_COUNT; i++)
1995 rs_rate_scale_clear_window(
1996 &(tbl->win[i]));
1997 }
1998 }
1999
2000 /* If transitioning to allow "search", reset all history
2001 * bitmaps and stats in active table (this will become the new
2002 * "search" table). */
2003 if (!lq_sta->stay_in_tbl) {
2004 for (i = 0; i < IWL_RATE_COUNT; i++)
2005 rs_rate_scale_clear_window(&(tbl->win[i]));
2006 }
2007 }
2008}
2009
2010/*
2011 * setup rate table in uCode
2012 */
2013static void rs_update_rate_tbl(struct iwl_mvm *mvm,
2014 struct iwl_lq_sta *lq_sta,
2015 struct iwl_scale_tbl_info *tbl,
2016 int index, u8 is_green)
2017{
2018 u32 rate;
2019
2020 /* Update uCode's rate table. */
2021 rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2022 rs_fill_link_cmd(mvm, lq_sta, rate);
2023 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2024}
2025
2026/*
2027 * Do rate scaling and search for new modulation mode.
2028 */
2029static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2030 struct sk_buff *skb,
2031 struct ieee80211_sta *sta,
2032 struct iwl_lq_sta *lq_sta)
2033{
2034 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2035 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2036 int low = IWL_RATE_INVALID;
2037 int high = IWL_RATE_INVALID;
2038 int index;
2039 int i;
2040 struct iwl_rate_scale_data *window = NULL;
2041 int current_tpt = IWL_INVALID_VALUE;
2042 int low_tpt = IWL_INVALID_VALUE;
2043 int high_tpt = IWL_INVALID_VALUE;
2044 u32 fail_count;
2045 s8 scale_action = 0;
2046 u16 rate_mask;
2047 u8 update_lq = 0;
2048 struct iwl_scale_tbl_info *tbl, *tbl1;
2049 u16 rate_scale_index_msk = 0;
2050 u8 is_green = 0;
2051 u8 active_tbl = 0;
2052 u8 done_search = 0;
2053 u16 high_low;
2054 s32 sr;
2055 u8 tid = IWL_MAX_TID_COUNT;
2056 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
2057 struct iwl_mvm_tid_data *tid_data;
2058
2059 IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n");
2060
2061 /* Send management frames and NO_ACK data using lowest rate. */
2062 /* TODO: this could probably be improved.. */
2063 if (!ieee80211_is_data(hdr->frame_control) ||
2064 info->flags & IEEE80211_TX_CTL_NO_ACK)
2065 return;
2066
2067 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2068
2069 tid = rs_tl_add_packet(lq_sta, hdr);
2070 if ((tid != IWL_MAX_TID_COUNT) &&
2071 (lq_sta->tx_agg_tid_en & (1 << tid))) {
2072 tid_data = &sta_priv->tid_data[tid];
2073 if (tid_data->state == IWL_AGG_OFF)
2074 lq_sta->is_agg = 0;
2075 else
2076 lq_sta->is_agg = 1;
2077 } else {
2078 lq_sta->is_agg = 0;
2079 }
2080
2081 /*
2082 * Select rate-scale / modulation-mode table to work with in
2083 * the rest of this function: "search" if searching for better
2084 * modulation mode, or "active" if doing rate scaling within a mode.
2085 */
2086 if (!lq_sta->search_better_tbl)
2087 active_tbl = lq_sta->active_tbl;
2088 else
2089 active_tbl = 1 - lq_sta->active_tbl;
2090
2091 tbl = &(lq_sta->lq_info[active_tbl]);
2092 if (is_legacy(tbl->lq_type))
2093 lq_sta->is_green = 0;
2094 else
2095 lq_sta->is_green = rs_use_green(sta);
2096 is_green = lq_sta->is_green;
2097
2098 /* current tx rate */
2099 index = lq_sta->last_txrate_idx;
2100
2101 IWL_DEBUG_RATE(mvm, "Rate scale index %d for type %d\n", index,
2102 tbl->lq_type);
2103
2104 /* rates available for this association, and for modulation mode */
2105 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2106
2107 IWL_DEBUG_RATE(mvm, "mask 0x%04X\n", rate_mask);
2108
2109 /* mask with station rate restriction */
2110 if (is_legacy(tbl->lq_type)) {
2111 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2112 /* supp_rates has no CCK bits in A mode */
2113 rate_scale_index_msk = (u16) (rate_mask &
2114 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2115 else
2116 rate_scale_index_msk = (u16) (rate_mask &
2117 lq_sta->supp_rates);
2118
2119 } else {
2120 rate_scale_index_msk = rate_mask;
2121 }
2122
2123 if (!rate_scale_index_msk)
2124 rate_scale_index_msk = rate_mask;
2125
2126 if (!((1 << index) & rate_scale_index_msk)) {
2127 IWL_ERR(mvm, "Current Rate is not valid\n");
2128 if (lq_sta->search_better_tbl) {
2129 /* revert to active table if search table is not valid*/
2130 tbl->lq_type = LQ_NONE;
2131 lq_sta->search_better_tbl = 0;
2132 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2133 /* get "active" rate info */
2134 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2135 rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2136 }
2137 return;
2138 }
2139
2140 /* Get expected throughput table and history window for current rate */
2141 if (!tbl->expected_tpt) {
2142 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2143 return;
2144 }
2145
2146 /* force user max rate if set by user */
2147 if ((lq_sta->max_rate_idx != -1) &&
2148 (lq_sta->max_rate_idx < index)) {
2149 index = lq_sta->max_rate_idx;
2150 update_lq = 1;
2151 window = &(tbl->win[index]);
2152 goto lq_update;
2153 }
2154
2155 window = &(tbl->win[index]);
2156
2157 /*
2158 * If there is not enough history to calculate actual average
2159 * throughput, keep analyzing results of more tx frames, without
2160 * changing rate or mode (bypass most of the rest of this function).
2161 * Set up new rate table in uCode only if old rate is not supported
2162 * in current association (use new rate found above).
2163 */
2164 fail_count = window->counter - window->success_counter;
2165 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2166 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2167 IWL_DEBUG_RATE(mvm,
2168 "LQ: still below TH. succ=%d total=%d for index %d\n",
2169 window->success_counter, window->counter, index);
2170
2171 /* Can't calculate this yet; not enough history */
2172 window->average_tpt = IWL_INVALID_VALUE;
2173
2174 /* Should we stay with this modulation mode,
2175 * or search for a new one? */
2176 rs_stay_in_table(lq_sta, false);
2177
2178 goto out;
2179 }
2180 /* Else we have enough samples; calculate estimate of
2181 * actual average throughput */
2182 if (window->average_tpt != ((window->success_ratio *
2183 tbl->expected_tpt[index] + 64) / 128)) {
2184 IWL_ERR(mvm,
2185 "expected_tpt should have been calculated by now\n");
2186 window->average_tpt = ((window->success_ratio *
2187 tbl->expected_tpt[index] + 64) / 128);
2188 }
2189
2190 /* If we are searching for better modulation mode, check success. */
2191 if (lq_sta->search_better_tbl) {
2192 /* If good success, continue using the "search" mode;
2193 * no need to send new link quality command, since we're
2194 * continuing to use the setup that we've been trying. */
2195 if (window->average_tpt > lq_sta->last_tpt) {
2196 IWL_DEBUG_RATE(mvm,
2197 "LQ: SWITCHING TO NEW TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2198 window->success_ratio,
2199 window->average_tpt,
2200 lq_sta->last_tpt);
2201
2202 if (!is_legacy(tbl->lq_type))
2203 lq_sta->enable_counter = 1;
2204
2205 /* Swap tables; "search" becomes "active" */
2206 lq_sta->active_tbl = active_tbl;
2207 current_tpt = window->average_tpt;
2208 /* Else poor success; go back to mode in "active" table */
2209 } else {
2210 IWL_DEBUG_RATE(mvm,
2211 "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
2212 window->success_ratio,
2213 window->average_tpt,
2214 lq_sta->last_tpt);
2215
2216 /* Nullify "search" table */
2217 tbl->lq_type = LQ_NONE;
2218
2219 /* Revert to "active" table */
2220 active_tbl = lq_sta->active_tbl;
2221 tbl = &(lq_sta->lq_info[active_tbl]);
2222
2223 /* Revert to "active" rate and throughput info */
2224 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2225 current_tpt = lq_sta->last_tpt;
2226
2227 /* Need to set up a new rate table in uCode */
2228 update_lq = 1;
2229 }
2230
2231 /* Either way, we've made a decision; modulation mode
2232 * search is done, allow rate adjustment next time. */
2233 lq_sta->search_better_tbl = 0;
2234 done_search = 1; /* Don't switch modes below! */
2235 goto lq_update;
2236 }
2237
2238 /* (Else) not in search of better modulation mode, try for better
2239 * starting rate, while staying in this mode. */
2240 high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
2241 tbl->lq_type);
2242 low = high_low & 0xff;
2243 high = (high_low >> 8) & 0xff;
2244
2245 /* If user set max rate, dont allow higher than user constrain */
2246 if ((lq_sta->max_rate_idx != -1) &&
2247 (lq_sta->max_rate_idx < high))
2248 high = IWL_RATE_INVALID;
2249
2250 sr = window->success_ratio;
2251
2252 /* Collect measured throughputs for current and adjacent rates */
2253 current_tpt = window->average_tpt;
2254 if (low != IWL_RATE_INVALID)
2255 low_tpt = tbl->win[low].average_tpt;
2256 if (high != IWL_RATE_INVALID)
2257 high_tpt = tbl->win[high].average_tpt;
2258
2259 scale_action = 0;
2260
2261 /* Too many failures, decrease rate */
2262 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2263 IWL_DEBUG_RATE(mvm,
2264 "decrease rate because of low success_ratio\n");
2265 scale_action = -1;
2266 /* No throughput measured yet for adjacent rates; try increase. */
2267 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2268 (high_tpt == IWL_INVALID_VALUE)) {
2269 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2270 scale_action = 1;
2271 else if (low != IWL_RATE_INVALID)
2272 scale_action = 0;
2273 }
2274
2275 /* Both adjacent throughputs are measured, but neither one has better
2276 * throughput; we're using the best rate, don't change it! */
2277 else if ((low_tpt != IWL_INVALID_VALUE) &&
2278 (high_tpt != IWL_INVALID_VALUE) &&
2279 (low_tpt < current_tpt) &&
2280 (high_tpt < current_tpt))
2281 scale_action = 0;
2282
2283 /* At least one adjacent rate's throughput is measured,
2284 * and may have better performance. */
2285 else {
2286 /* Higher adjacent rate's throughput is measured */
2287 if (high_tpt != IWL_INVALID_VALUE) {
2288 /* Higher rate has better throughput */
2289 if (high_tpt > current_tpt &&
2290 sr >= IWL_RATE_INCREASE_TH) {
2291 scale_action = 1;
2292 } else {
2293 scale_action = 0;
2294 }
2295
2296 /* Lower adjacent rate's throughput is measured */
2297 } else if (low_tpt != IWL_INVALID_VALUE) {
2298 /* Lower rate has better throughput */
2299 if (low_tpt > current_tpt) {
2300 IWL_DEBUG_RATE(mvm,
2301 "decrease rate because of low tpt\n");
2302 scale_action = -1;
2303 } else if (sr >= IWL_RATE_INCREASE_TH) {
2304 scale_action = 1;
2305 }
2306 }
2307 }
2308
2309 /* Sanity check; asked for decrease, but success rate or throughput
2310 * has been good at old rate. Don't change it. */
2311 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2312 ((sr > IWL_RATE_HIGH_TH) ||
2313 (current_tpt > (100 * tbl->expected_tpt[low]))))
2314 scale_action = 0;
2315
2316 switch (scale_action) {
2317 case -1:
2318 /* Decrease starting rate, update uCode's rate table */
2319 if (low != IWL_RATE_INVALID) {
2320 update_lq = 1;
2321 index = low;
2322 }
2323
2324 break;
2325 case 1:
2326 /* Increase starting rate, update uCode's rate table */
2327 if (high != IWL_RATE_INVALID) {
2328 update_lq = 1;
2329 index = high;
2330 }
2331
2332 break;
2333 case 0:
2334 /* No change */
2335 default:
2336 break;
2337 }
2338
2339 IWL_DEBUG_RATE(mvm,
2340 "choose rate scale index %d action %d low %d high %d type %d\n",
2341 index, scale_action, low, high, tbl->lq_type);
2342
2343lq_update:
2344 /* Replace uCode's rate table for the destination station. */
2345 if (update_lq)
2346 rs_update_rate_tbl(mvm, lq_sta, tbl, index, is_green);
2347
2348 rs_stay_in_table(lq_sta, false);
2349
2350 /*
2351 * Search for new modulation mode if we're:
2352 * 1) Not changing rates right now
2353 * 2) Not just finishing up a search
2354 * 3) Allowing a new search
2355 */
2356 if (!update_lq && !done_search &&
2357 !lq_sta->stay_in_tbl && window->counter) {
2358 /* Save current throughput to compare with "search" throughput*/
2359 lq_sta->last_tpt = current_tpt;
2360
2361 /* Select a new "search" modulation mode to try.
2362 * If one is found, set up the new "search" table. */
2363 if (is_legacy(tbl->lq_type))
2364 rs_move_legacy_other(mvm, lq_sta, sta, index);
2365 else if (is_siso(tbl->lq_type))
2366 rs_move_siso_to_other(mvm, lq_sta, sta, index);
2367 else if (is_mimo2(tbl->lq_type))
2368 rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2369 else
2370 rs_move_mimo3_to_other(mvm, lq_sta, sta, index);
2371
2372 /* If new "search" mode was selected, set up in uCode table */
2373 if (lq_sta->search_better_tbl) {
2374 /* Access the "search" table, clear its history. */
2375 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2376 for (i = 0; i < IWL_RATE_COUNT; i++)
2377 rs_rate_scale_clear_window(&(tbl->win[i]));
2378
2379 /* Use new "search" start rate */
2380 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2381
2382 IWL_DEBUG_RATE(mvm,
2383 "Switch current mcs: %X index: %d\n",
2384 tbl->current_rate, index);
2385 rs_fill_link_cmd(mvm, lq_sta, tbl->current_rate);
2386 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2387 } else {
2388 done_search = 1;
2389 }
2390 }
2391
2392 if (done_search && !lq_sta->stay_in_tbl) {
2393 /* If the "active" (non-search) mode was legacy,
2394 * and we've tried switching antennas,
2395 * but we haven't been able to try HT modes (not available),
2396 * stay with best antenna legacy modulation for a while
2397 * before next round of mode comparisons. */
2398 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2399 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2400 lq_sta->action_counter > tbl1->max_search) {
2401 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2402 rs_set_stay_in_table(mvm, 1, lq_sta);
2403 }
2404
2405 /* If we're in an HT mode, and all 3 mode switch actions
2406 * have been tried and compared, stay in this best modulation
2407 * mode for a while before next round of mode comparisons. */
2408 if (lq_sta->enable_counter &&
2409 (lq_sta->action_counter >= tbl1->max_search)) {
2410 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2411 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2412 (tid != IWL_MAX_TID_COUNT)) {
2413 tid_data = &sta_priv->tid_data[tid];
2414 if (tid_data->state == IWL_AGG_OFF) {
2415 IWL_DEBUG_RATE(mvm,
2416 "try to aggregate tid %d\n",
2417 tid);
2418 rs_tl_turn_on_agg(mvm, tid,
2419 lq_sta, sta);
2420 }
2421 }
2422 rs_set_stay_in_table(mvm, 0, lq_sta);
2423 }
2424 }
2425
2426out:
2427 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index, is_green);
2428 lq_sta->last_txrate_idx = index;
2429}
2430
2431/**
2432 * rs_initialize_lq - Initialize a station's hardware rate table
2433 *
2434 * The uCode's station table contains a table of fallback rates
2435 * for automatic fallback during transmission.
2436 *
2437 * NOTE: This sets up a default set of values. These will be replaced later
2438 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2439 * rc80211_simple.
2440 *
2441 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2442 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2443 * which requires station table entry to exist).
2444 */
2445static void rs_initialize_lq(struct iwl_mvm *mvm,
2446 struct ieee80211_sta *sta,
2447 struct iwl_lq_sta *lq_sta,
2448 enum ieee80211_band band)
2449{
2450 struct iwl_scale_tbl_info *tbl;
2451 int rate_idx;
2452 int i;
2453 u32 rate;
2454 u8 use_green = rs_use_green(sta);
2455 u8 active_tbl = 0;
2456 u8 valid_tx_ant;
2457
2458 if (!sta || !lq_sta)
2459 return;
2460
2461 i = lq_sta->last_txrate_idx;
2462
ff402312 2463 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2464
2465 if (!lq_sta->search_better_tbl)
2466 active_tbl = lq_sta->active_tbl;
2467 else
2468 active_tbl = 1 - lq_sta->active_tbl;
2469
2470 tbl = &(lq_sta->lq_info[active_tbl]);
2471
2472 if ((i < 0) || (i >= IWL_RATE_COUNT))
2473 i = 0;
2474
2475 rate = iwl_rates[i].plcp;
2476 tbl->ant_type = first_antenna(valid_tx_ant);
2477 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2478
2479 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2480 rate |= RATE_MCS_CCK_MSK;
2481
2482 rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2483 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2484 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2485
2486 rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx, use_green);
2487 tbl->current_rate = rate;
2488 rs_set_expected_tpt_table(lq_sta, tbl);
2489 rs_fill_link_cmd(NULL, lq_sta, rate);
2490 /* TODO restore station should remember the lq cmd */
2491 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_SYNC, true);
2492}
2493
2494static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2495 struct ieee80211_tx_rate_control *txrc)
2496{
2497 struct sk_buff *skb = txrc->skb;
2498 struct ieee80211_supported_band *sband = txrc->sband;
2499 struct iwl_op_mode *op_mode __maybe_unused =
2500 (struct iwl_op_mode *)mvm_r;
2501 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2502 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2503 struct iwl_lq_sta *lq_sta = mvm_sta;
2504 int rate_idx;
2505
2506 IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n");
2507
2508 /* Get max rate if user set max rate */
2509 if (lq_sta) {
2510 lq_sta->max_rate_idx = txrc->max_rate_idx;
2511 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2512 (lq_sta->max_rate_idx != -1))
2513 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2514 if ((lq_sta->max_rate_idx < 0) ||
2515 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2516 lq_sta->max_rate_idx = -1;
2517 }
2518
2519 /* Treat uninitialized rate scaling data same as non-existing. */
2520 if (lq_sta && !lq_sta->drv) {
2521 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2522 mvm_sta = NULL;
2523 }
2524
2525 /* Send management frames and NO_ACK data using lowest rate. */
2526 if (rate_control_send_low(sta, mvm_sta, txrc))
2527 return;
2528
2529 rate_idx = lq_sta->last_txrate_idx;
2530
2531 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2532 rate_idx -= IWL_FIRST_OFDM_RATE;
2533 /* 6M and 9M shared same MCS index */
2534 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2535 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2536 IWL_RATE_MIMO3_6M_PLCP)
2537 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2538 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2539 IWL_RATE_MIMO2_6M_PLCP)
2540 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2541 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2542 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2543 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2544 if (lq_sta->last_rate_n_flags & RATE_MCS_CHAN_WIDTH_40) /* TODO */
2545 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2546 if (lq_sta->last_rate_n_flags & RATE_HT_MCS_GF_MSK)
2547 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2548 } else {
2549 /* Check for invalid rates */
2550 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2551 ((sband->band == IEEE80211_BAND_5GHZ) &&
2552 (rate_idx < IWL_FIRST_OFDM_RATE)))
2553 rate_idx = rate_lowest_index(sband, sta);
2554 /* On valid 5 GHz rate, adjust index */
2555 else if (sband->band == IEEE80211_BAND_5GHZ)
2556 rate_idx -= IWL_FIRST_OFDM_RATE;
2557 info->control.rates[0].flags = 0;
2558 }
2559 info->control.rates[0].idx = rate_idx;
2560}
2561
2562static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2563 gfp_t gfp)
2564{
2565 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2566 struct iwl_op_mode *op_mode __maybe_unused =
2567 (struct iwl_op_mode *)mvm_rate;
2568 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2569
2570 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2571
2572 return &sta_priv->lq_sta;
2573}
2574
2575/*
2576 * Called after adding a new station to initialize rate scaling
2577 */
2578void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2579 enum ieee80211_band band)
2580{
2581 int i, j;
2582 struct ieee80211_hw *hw = mvm->hw;
2583 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2584 struct iwl_mvm_sta *sta_priv;
2585 struct iwl_lq_sta *lq_sta;
2586 struct ieee80211_supported_band *sband;
2587 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2588
2589 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2590 lq_sta = &sta_priv->lq_sta;
2591 sband = hw->wiphy->bands[band];
2592
2593 lq_sta->lq.sta_id = sta_priv->sta_id;
2594
2595 for (j = 0; j < LQ_SIZE; j++)
2596 for (i = 0; i < IWL_RATE_COUNT; i++)
2597 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2598
2599 lq_sta->flush_timer = 0;
2600 lq_sta->supp_rates = sta->supp_rates[sband->band];
2601 for (j = 0; j < LQ_SIZE; j++)
2602 for (i = 0; i < IWL_RATE_COUNT; i++)
2603 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2604
2605 IWL_DEBUG_RATE(mvm,
2606 "LQ: *** rate scale station global init for station %d ***\n",
2607 sta_priv->sta_id);
2608 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2609 * the lowest or the highest rate.. Could consider using RSSI from
2610 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2611 * after assoc.. */
2612
2613 lq_sta->max_rate_idx = -1;
2614 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2615 lq_sta->is_green = rs_use_green(sta);
2616 lq_sta->band = sband->band;
2617 /*
2618 * active legacy rates as per supported rates bitmap
2619 */
2620 supp = sta->supp_rates[sband->band];
2621 lq_sta->active_legacy_rate = 0;
2622 for_each_set_bit(i, &supp, BITS_PER_LONG)
2623 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2624
2625 /*
2626 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2627 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2628 */
2629 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2630 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2631 lq_sta->active_siso_rate &= ~((u16)0x2);
2632 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2633
2634 /* Same here */
2635 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2636 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2637 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2638 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2639
2640 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2641 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2642 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2643 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2644
2645 IWL_DEBUG_RATE(mvm,
2646 "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2647 lq_sta->active_siso_rate,
2648 lq_sta->active_mimo2_rate,
2649 lq_sta->active_mimo3_rate);
2650
2651 /* These values will be overridden later */
2652 lq_sta->lq.single_stream_ant_msk =
ff402312 2653 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
8ca151b5 2654 lq_sta->lq.dual_stream_ant_msk =
ff402312
EG		 2655 iwl_fw_valid_tx_ant(mvm->fw) &
2656 ~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
8ca151b5
JB		 2657 if (!lq_sta->lq.dual_stream_ant_msk) {
2658 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
ff402312 2659 } else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
8ca151b5 2660 lq_sta->lq.dual_stream_ant_msk =
ff402312 2661 iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2662 }
2663
2664 /* as default allow aggregation for all tids */
2665 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2666 lq_sta->drv = mvm;
2667
2668 /* Set last_txrate_idx to lowest rate */
2669 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2670 if (sband->band == IEEE80211_BAND_5GHZ)
2671 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2672 lq_sta->is_agg = 0;
2673#ifdef CONFIG_MAC80211_DEBUGFS
2674 lq_sta->dbg_fixed_rate = 0;
2675#endif
2676
2677 rs_initialize_lq(mvm, sta, lq_sta, band);
2678}
2679
2680static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2681 struct iwl_lq_sta *lq_sta, u32 new_rate)
2682{
2683 struct iwl_scale_tbl_info tbl_type;
2684 int index = 0;
2685 int rate_idx;
2686 int repeat_rate = 0;
2687 u8 ant_toggle_cnt = 0;
2688 u8 use_ht_possible = 1;
2689 u8 valid_tx_ant = 0;
2690 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2691
2692 /* Override starting rate (index 0) if needed for debug purposes */
2693 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2694
2695 /* Interpret new_rate (rate_n_flags) */
2696 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2697 &tbl_type, &rate_idx);
2698
2699 /* How many times should we repeat the initial rate? */
2700 if (is_legacy(tbl_type.lq_type)) {
2701 ant_toggle_cnt = 1;
2702 repeat_rate = IWL_NUMBER_TRY;
2703 } else {
2704 repeat_rate = min(IWL_HT_NUMBER_TRY,
2705 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2706 }
2707
2708 lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2709
2710 /* Fill 1st table entry (index 0) */
2711 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2712
2713 if (num_of_ant(tbl_type.ant_type) == 1)
2714 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2715 else if (num_of_ant(tbl_type.ant_type) == 2)
2716 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2717 /* otherwise we don't modify the existing value */
2718
2719 index++;
2720 repeat_rate--;
2721 if (mvm)
ff402312 2722 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2723
2724 /* Fill rest of rate table */
2725 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2726 /* Repeat initial/next rate.
2727 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2728 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2729 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2730 if (is_legacy(tbl_type.lq_type)) {
2731 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2732 ant_toggle_cnt++;
2733 else if (mvm &&
2734 rs_toggle_antenna(valid_tx_ant,
2735 &new_rate, &tbl_type))
2736 ant_toggle_cnt = 1;
2737 }
2738
2739 /* Override next rate if needed for debug purposes */
2740 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2741
2742 /* Fill next table entry */
2743 lq_cmd->rs_table[index] =
2744 cpu_to_le32(new_rate);
2745 repeat_rate--;
2746 index++;
2747 }
2748
2749 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2750 &rate_idx);
2751
2752
2753 /* Indicate to uCode which entries might be MIMO.
2754 * If initial rate was MIMO, this will finally end up
2755 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2756 if (is_mimo(tbl_type.lq_type))
2757 lq_cmd->mimo_delim = index;
2758
2759 /* Get next rate */
2760 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2761 use_ht_possible);
2762
2763 /* How many times should we repeat the next rate? */
2764 if (is_legacy(tbl_type.lq_type)) {
2765 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2766 ant_toggle_cnt++;
2767 else if (mvm &&
2768 rs_toggle_antenna(valid_tx_ant,
2769 &new_rate, &tbl_type))
2770 ant_toggle_cnt = 1;
2771
2772 repeat_rate = IWL_NUMBER_TRY;
2773 } else {
2774 repeat_rate = IWL_HT_NUMBER_TRY;
2775 }
2776
2777 /* Don't allow HT rates after next pass.
2778 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2779 use_ht_possible = 0;
2780
2781 /* Override next rate if needed for debug purposes */
2782 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2783
2784 /* Fill next table entry */
2785 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2786
2787 index++;
2788 repeat_rate--;
2789 }
2790
2791 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2792 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2793
2794 lq_cmd->agg_time_limit =
2795 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
e96d551f
EG		 2796
2797 /*
2798 * overwrite if needed, pass aggregation time limit
2799 * to uCode in uSec - This is racy - but heh, at least it helps...
2800 */
2801 if (mvm && BT_MBOX_MSG(&mvm->last_bt_notif, 3, TRAFFIC_LOAD) >= 2)
2802 lq_cmd->agg_time_limit = cpu_to_le16(1200);
8ca151b5
JB		 2803}
2804
2805static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2806{
2807 return hw->priv;
2808}
2809/* rate scale requires free function to be implemented */
2810static void rs_free(void *mvm_rate)
2811{
2812 return;
2813}
2814
2815static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2816 void *mvm_sta)
2817{
2818 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2819 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2820
2821 IWL_DEBUG_RATE(mvm, "enter\n");
2822 IWL_DEBUG_RATE(mvm, "leave\n");
2823}
2824
2825#ifdef CONFIG_MAC80211_DEBUGFS
2826static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2827 u32 *rate_n_flags, int index)
2828{
2829 struct iwl_mvm *mvm;
2830 u8 valid_tx_ant;
2831 u8 ant_sel_tx;
2832
2833 mvm = lq_sta->drv;
ff402312 2834 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2835 if (lq_sta->dbg_fixed_rate) {
2836 ant_sel_tx =
2837 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2838 >> RATE_MCS_ANT_POS);
2839 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2840 *rate_n_flags = lq_sta->dbg_fixed_rate;
2841 IWL_DEBUG_RATE(mvm, "Fixed rate ON\n");
2842 } else {
2843 lq_sta->dbg_fixed_rate = 0;
2844 IWL_ERR(mvm,
2845 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2846 ant_sel_tx, valid_tx_ant);
2847 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2848 }
2849 } else {
2850 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2851 }
2852}
2853
2854static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2855 const char __user *user_buf, size_t count, loff_t *ppos)
2856{
2857 struct iwl_lq_sta *lq_sta = file->private_data;
2858 struct iwl_mvm *mvm;
2859 char buf[64];
2860 size_t buf_size;
2861 u32 parsed_rate;
2862
2863
2864 mvm = lq_sta->drv;
2865 memset(buf, 0, sizeof(buf));
2866 buf_size = min(count, sizeof(buf) - 1);
2867 if (copy_from_user(buf, user_buf, buf_size))
2868 return -EFAULT;
2869
2870 if (sscanf(buf, "%x", &parsed_rate) == 1)
2871 lq_sta->dbg_fixed_rate = parsed_rate;
2872 else
2873 lq_sta->dbg_fixed_rate = 0;
2874
2875 rs_program_fix_rate(mvm, lq_sta);
2876
2877 return count;
2878}
2879
2880static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2881 char __user *user_buf, size_t count, loff_t *ppos)
2882{
2883 char *buff;
2884 int desc = 0;
2885 int i = 0;
2886 int index = 0;
2887 ssize_t ret;
2888
2889 struct iwl_lq_sta *lq_sta = file->private_data;
2890 struct iwl_mvm *mvm;
2891 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2892
2893 mvm = lq_sta->drv;
2894 buff = kmalloc(1024, GFP_KERNEL);
2895 if (!buff)
2896 return -ENOMEM;
2897
2898 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2899 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2900 lq_sta->total_failed, lq_sta->total_success,
2901 lq_sta->active_legacy_rate);
2902 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2903 lq_sta->dbg_fixed_rate);
2904 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
ff402312
EG		 2905 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2906 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2907 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
8ca151b5
JB		 2908 desc += sprintf(buff+desc, "lq type %s\n",
2909 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2910 if (is_Ht(tbl->lq_type)) {
2911 desc += sprintf(buff+desc, " %s",
2912 (is_siso(tbl->lq_type)) ? "SISO" :
2913 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2914 desc += sprintf(buff+desc, " %s",
2915 (tbl->is_ht40) ? "40MHz" : "20MHz");
2916 desc += sprintf(buff+desc, " %s %s %s\n",
2917 (tbl->is_SGI) ? "SGI" : "",
2918 (lq_sta->is_green) ? "GF enabled" : "",
2919 (lq_sta->is_agg) ? "AGG on" : "");
2920 }
2921 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2922 lq_sta->last_rate_n_flags);
2923 desc += sprintf(buff+desc,
2924 "general: flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2925 lq_sta->lq.flags,
2926 lq_sta->lq.mimo_delim,
2927 lq_sta->lq.single_stream_ant_msk,
2928 lq_sta->lq.dual_stream_ant_msk);
2929
2930 desc += sprintf(buff+desc,
2931 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2932 le16_to_cpu(lq_sta->lq.agg_time_limit),
2933 lq_sta->lq.agg_disable_start_th,
2934 lq_sta->lq.agg_frame_cnt_limit);
2935
2936 desc += sprintf(buff+desc,
2937 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2938 lq_sta->lq.initial_rate_index[0],
2939 lq_sta->lq.initial_rate_index[1],
2940 lq_sta->lq.initial_rate_index[2],
2941 lq_sta->lq.initial_rate_index[3]);
2942
2943 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2944 index = iwl_hwrate_to_plcp_idx(
2945 le32_to_cpu(lq_sta->lq.rs_table[i]));
2946 if (is_legacy(tbl->lq_type)) {
2947 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2948 i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2949 iwl_rate_mcs[index].mbps);
2950 } else {
2951 desc += sprintf(buff+desc,
2952 " rate[%d] 0x%X %smbps (%s)\n",
2953 i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2954 iwl_rate_mcs[index].mbps,
2955 iwl_rate_mcs[index].mcs);
2956 }
2957 }
2958
2959 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2960 kfree(buff);
2961 return ret;
2962}
2963
2964static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2965 .write = rs_sta_dbgfs_scale_table_write,
2966 .read = rs_sta_dbgfs_scale_table_read,
2967 .open = simple_open,
2968 .llseek = default_llseek,
2969};
2970static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2971 char __user *user_buf, size_t count, loff_t *ppos)
2972{
2973 char *buff;
2974 int desc = 0;
2975 int i, j;
2976 ssize_t ret;
2977
2978 struct iwl_lq_sta *lq_sta = file->private_data;
2979
2980 buff = kmalloc(1024, GFP_KERNEL);
2981 if (!buff)
2982 return -ENOMEM;
2983
2984 for (i = 0; i < LQ_SIZE; i++) {
2985 desc += sprintf(buff+desc,
2986 "%s type=%d SGI=%d HT40=%d DUP=0 GF=%d\n"
2987 "rate=0x%X\n",
2988 lq_sta->active_tbl == i ? "*" : "x",
2989 lq_sta->lq_info[i].lq_type,
2990 lq_sta->lq_info[i].is_SGI,
2991 lq_sta->lq_info[i].is_ht40,
2992 lq_sta->is_green,
2993 lq_sta->lq_info[i].current_rate);
2994 for (j = 0; j < IWL_RATE_COUNT; j++) {
2995 desc += sprintf(buff+desc,
2996 "counter=%d success=%d %%=%d\n",
2997 lq_sta->lq_info[i].win[j].counter,
2998 lq_sta->lq_info[i].win[j].success_counter,
2999 lq_sta->lq_info[i].win[j].success_ratio);
3000 }
3001 }
3002 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3003 kfree(buff);
3004 return ret;
3005}
3006
3007static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3008 .read = rs_sta_dbgfs_stats_table_read,
3009 .open = simple_open,
3010 .llseek = default_llseek,
3011};
3012
3013static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3014 char __user *user_buf, size_t count, loff_t *ppos)
3015{
3016 struct iwl_lq_sta *lq_sta = file->private_data;
3017 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3018 char buff[120];
3019 int desc = 0;
3020
3021 if (is_Ht(tbl->lq_type))
3022 desc += sprintf(buff+desc,
3023 "Bit Rate= %d Mb/s\n",
3024 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3025 else
3026 desc += sprintf(buff+desc,
3027 "Bit Rate= %d Mb/s\n",
3028 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3029
3030 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3031}
3032
3033static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3034 .read = rs_sta_dbgfs_rate_scale_data_read,
3035 .open = simple_open,
3036 .llseek = default_llseek,
3037};
3038
3039static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3040{
3041 struct iwl_lq_sta *lq_sta = mvm_sta;
3042 lq_sta->rs_sta_dbgfs_scale_table_file =
3043 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3044 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3045 lq_sta->rs_sta_dbgfs_stats_table_file =
3046 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3047 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3048 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3049 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3050 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3051 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3052 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3053 &lq_sta->tx_agg_tid_en);
3054}
3055
3056static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3057{
3058 struct iwl_lq_sta *lq_sta = mvm_sta;
3059 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3060 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3061 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3062 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3063}
3064#endif
3065
3066/*
3067 * Initialization of rate scaling information is done by driver after
3068 * the station is added. Since mac80211 calls this function before a
3069 * station is added we ignore it.
3070 */
3071static void rs_rate_init_stub(void *mvm_r,
3072 struct ieee80211_supported_band *sband,
3073 struct ieee80211_sta *sta, void *mvm_sta)
3074{
3075}
3076static struct rate_control_ops rs_mvm_ops = {
3077 .module = NULL,
3078 .name = RS_NAME,
3079 .tx_status = rs_tx_status,
3080 .get_rate = rs_get_rate,
3081 .rate_init = rs_rate_init_stub,
3082 .alloc = rs_alloc,
3083 .free = rs_free,
3084 .alloc_sta = rs_alloc_sta,
3085 .free_sta = rs_free_sta,
3086#ifdef CONFIG_MAC80211_DEBUGFS
3087 .add_sta_debugfs = rs_add_debugfs,
3088 .remove_sta_debugfs = rs_remove_debugfs,
3089#endif
3090};
3091
3092int iwl_mvm_rate_control_register(void)
3093{
3094 return ieee80211_rate_control_register(&rs_mvm_ops);
3095}
3096
3097void iwl_mvm_rate_control_unregister(void)
3098{
3099 ieee80211_rate_control_unregister(&rs_mvm_ops);
3100}
9ee718aa
EL		 3101
3102/**
3103 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3104 * Tx protection, according to this rquest and previous requests,
3105 * and send the LQ command.
3106 * @lq: The LQ command
3107 * @mvmsta: The station
3108 * @enable: Enable Tx protection?
3109 */
3110int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_lq_cmd *lq,
3111 struct iwl_mvm_sta *mvmsta, bool enable)
3112{
3113 lockdep_assert_held(&mvm->mutex);
3114
3115 if (enable) {
3116 if (mvmsta->tx_protection == 0)
3117 lq->flags |= LQ_FLAG_SET_STA_TLC_RTS_MSK;
3118 mvmsta->tx_protection++;
3119 } else {
3120 mvmsta->tx_protection--;
3121 if (mvmsta->tx_protection == 0)
3122 lq->flags &= ~LQ_FLAG_SET_STA_TLC_RTS_MSK;
3123 }
3124
3125 return iwl_mvm_send_lq_cmd(mvm, lq, CMD_ASYNC, false);
3126}
Linux 6.x block layer and io_uring tree(s)