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iwlwifi: mvm: rs: set dual_stream_ant_msk to ANT_AB always
[mirror_ubuntu-artful-kernel.git] / drivers / net / wireless / iwlwifi / mvm / rs.c
CommitLineData
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 */
d17334c4 50#define IWL_RATE_MIN_FAILURE_TH 3 /* min failures to calc tpt */
8ca151b5
JB		 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
32b01726
ES		 55#define RS_STAY_IN_COLUMN_TIMEOUT (5*HZ)
56
8ca151b5
JB		 57
58static u8 rs_ht_to_legacy[] = {
ef4394b9
EP		 59 [IWL_RATE_1M_INDEX] = IWL_RATE_6M_INDEX,
60 [IWL_RATE_2M_INDEX] = IWL_RATE_6M_INDEX,
61 [IWL_RATE_5M_INDEX] = IWL_RATE_6M_INDEX,
62 [IWL_RATE_11M_INDEX] = IWL_RATE_6M_INDEX,
63 [IWL_RATE_6M_INDEX] = IWL_RATE_6M_INDEX,
64 [IWL_RATE_9M_INDEX] = IWL_RATE_6M_INDEX,
65 [IWL_RATE_12M_INDEX] = IWL_RATE_9M_INDEX,
66 [IWL_RATE_18M_INDEX] = IWL_RATE_12M_INDEX,
67 [IWL_RATE_24M_INDEX] = IWL_RATE_18M_INDEX,
68 [IWL_RATE_36M_INDEX] = IWL_RATE_24M_INDEX,
69 [IWL_RATE_48M_INDEX] = IWL_RATE_36M_INDEX,
70 [IWL_RATE_54M_INDEX] = IWL_RATE_48M_INDEX,
71 [IWL_RATE_60M_INDEX] = IWL_RATE_54M_INDEX,
8ca151b5
JB		 72};
73
74static const u8 ant_toggle_lookup[] = {
ef4394b9
EP		 75 [ANT_NONE] = ANT_NONE,
76 [ANT_A] = ANT_B,
77 [ANT_B] = ANT_C,
78 [ANT_AB] = ANT_BC,
79 [ANT_C] = ANT_A,
80 [ANT_AC] = ANT_AB,
81 [ANT_BC] = ANT_AC,
82 [ANT_ABC] = ANT_ABC,
8ca151b5
JB		 83};
84
d310e405
ES		 85#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \
86 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
87 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
88 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
89 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
90 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
91 IWL_RATE_##rp##M_INDEX, \
ab055ce9 92 IWL_RATE_##rn##M_INDEX }
8ca151b5 93
d310e405
ES		 94#define IWL_DECLARE_MCS_RATE(s) \
95 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \
96 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \
97 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
98 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
99 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
100 IWL_RATE_INVM_INDEX, \
101 IWL_RATE_INVM_INDEX }
102
8ca151b5
JB		 103/*
104 * Parameter order:
ab055ce9 105 * rate, ht rate, prev rate, next rate
8ca151b5
JB		 106 *
107 * If there isn't a valid next or previous rate then INV is used which
108 * maps to IWL_RATE_INVALID
109 *
110 */
111static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
ab055ce9
ES		 112 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */
113 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */
114 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */
115 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */
d310e405
ES		 116 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */
117 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */
118 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */
119 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */
120 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */
121 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */
122 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */
123 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */
124 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */
125 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */
126 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */
8ca151b5
JB		 127};
128
129static inline u8 rs_extract_rate(u32 rate_n_flags)
130{
131 /* also works for HT because bits 7:6 are zero there */
132 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
133}
134
135static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
136{
137 int idx = 0;
138
8ca151b5 139 if (rate_n_flags & RATE_MCS_HT_MSK) {
d310e405
ES		 140 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
141 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 142
d310e405 143 /* skip 9M not supported in HT*/
8ca151b5
JB		 144 if (idx >= IWL_RATE_9M_INDEX)
145 idx += 1;
4e82dd3a 146 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
8ca151b5 147 return idx;
d310e405
ES		 148 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
149 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
150 idx += IWL_RATE_MCS_0_INDEX;
8ca151b5 151
d310e405
ES		 152 /* skip 9M not supported in VHT*/
153 if (idx >= IWL_RATE_9M_INDEX)
154 idx++;
155 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
156 return idx;
8ca151b5 157 } else {
d310e405
ES		 158 /* legacy rate format, search for match in table */
159
160 u8 legacy_rate = rs_extract_rate(rate_n_flags);
8ca151b5 161 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
d310e405 162 if (iwl_rates[idx].plcp == legacy_rate)
8ca151b5
JB		 163 return idx;
164 }
165
166 return -1;
167}
168
169static void rs_rate_scale_perform(struct iwl_mvm *mvm,
170 struct sk_buff *skb,
171 struct ieee80211_sta *sta,
172 struct iwl_lq_sta *lq_sta);
173static void rs_fill_link_cmd(struct iwl_mvm *mvm,
9145d151 174 struct ieee80211_sta *sta,
8ca151b5
JB		 175 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
176static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
4d30ee82 177static const char *rs_pretty_lq_type(enum iwl_table_type type);
5aa33553 178static const char *rs_pretty_ant(u8 ant);
8ca151b5
JB		 179
180#ifdef CONFIG_MAC80211_DEBUGFS
181static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3571ac33 182 u32 *rate_n_flags);
8ca151b5
JB		 183#else
184static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3571ac33 185 u32 *rate_n_flags)
8ca151b5
JB		 186{}
187#endif
188
189/**
190 * The following tables contain the expected throughput metrics for all rates
191 *
192 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
193 *
194 * where invalid entries are zeros.
195 *
196 * CCK rates are only valid in legacy table and will only be used in G
197 * (2.4 GHz) band.
198 */
199
200static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
4e82dd3a 201 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
8ca151b5
JB		 202};
203
4e82dd3a
ES		 204/* Expected TpT tables. 4 indexes:
205 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
206 */
207static s32 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
208 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
209 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
210 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
211 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
8ca151b5
JB		 212};
213
4e82dd3a
ES		 214static s32 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
215 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
216 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
217 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
218 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
8ca151b5
JB		 219};
220
d310e405
ES		 221static s32 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
222 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
223 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
224 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
225 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
226};
227
8ca151b5 228static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 229 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
230 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
231 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
232 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
8ca151b5
JB		 233};
234
235static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 236 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
237 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
238 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
239 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
8ca151b5
JB		 240};
241
d310e405
ES		 242static s32 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
243 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
244 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
245 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
246 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
247};
248
8ca151b5
JB		 249/* mbps, mcs */
250static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
251 { "1", "BPSK DSSS"},
252 { "2", "QPSK DSSS"},
253 {"5.5", "BPSK CCK"},
254 { "11", "QPSK CCK"},
255 { "6", "BPSK 1/2"},
256 { "9", "BPSK 1/2"},
257 { "12", "QPSK 1/2"},
258 { "18", "QPSK 3/4"},
259 { "24", "16QAM 1/2"},
260 { "36", "16QAM 3/4"},
261 { "48", "64QAM 2/3"},
262 { "54", "64QAM 3/4"},
263 { "60", "64QAM 5/6"},
264};
265
266#define MCS_INDEX_PER_STREAM (8)
267
5aa33553
ES		 268static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
269 const char *prefix)
270{
271 IWL_DEBUG_RATE(mvm, "%s: (%s: %d) ANT: %s BW: %d SGI: %d\n",
272 prefix, rs_pretty_lq_type(rate->type),
273 rate->index, rs_pretty_ant(rate->ant),
274 rate->bw, rate->sgi);
275}
276
8ca151b5
JB		 277static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
278{
279 window->data = 0;
280 window->success_counter = 0;
281 window->success_ratio = IWL_INVALID_VALUE;
282 window->counter = 0;
283 window->average_tpt = IWL_INVALID_VALUE;
8ca151b5
JB		 284}
285
286static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
287{
288 return (ant_type & valid_antenna) == ant_type;
289}
290
8ca151b5
JB		 291#ifdef CONFIG_MAC80211_DEBUGFS
292/**
293 * Program the device to use fixed rate for frame transmit
294 * This is for debugging/testing only
295 * once the device start use fixed rate, we need to reload the module
296 * to being back the normal operation.
297 */
298static void rs_program_fix_rate(struct iwl_mvm *mvm,
299 struct iwl_lq_sta *lq_sta)
300{
301 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
302 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
303 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
8ca151b5
JB		 304
305 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
306 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
307
308 if (lq_sta->dbg_fixed_rate) {
9145d151 309 rs_fill_link_cmd(NULL, NULL, lq_sta, lq_sta->dbg_fixed_rate);
9e680946 310 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
8ca151b5
JB		 311 }
312}
313#endif
314
8ca151b5
JB		 315static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
316 struct iwl_lq_sta *lq_data, u8 tid,
317 struct ieee80211_sta *sta)
318{
319 int ret = -EAGAIN;
8ca151b5 320
44cc429c
EG		 321 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
322 sta->addr, tid);
323 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
324 if (ret == -EAGAIN) {
325 /*
326 * driver and mac80211 is out of sync
327 * this might be cause by reloading firmware
328 * stop the tx ba session here
329 */
330 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
331 tid);
332 ieee80211_stop_tx_ba_session(sta, tid);
8ca151b5
JB		 333 }
334 return ret;
335}
336
337static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
338 struct iwl_lq_sta *lq_data,
339 struct ieee80211_sta *sta)
340{
341 if (tid < IWL_MAX_TID_COUNT)
342 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
343 else
344 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
345 tid, IWL_MAX_TID_COUNT);
346}
347
348static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
349{
350 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
351 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
352 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
353}
354
355/*
356 * Static function to get the expected throughput from an iwl_scale_tbl_info
357 * that wraps a NULL pointer check
358 */
359static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
360{
361 if (tbl->expected_tpt)
362 return tbl->expected_tpt[rs_index];
363 return 0;
364}
365
366/**
367 * rs_collect_tx_data - Update the success/failure sliding window
368 *
369 * We keep a sliding window of the last 62 packets transmitted
370 * at this rate. window->data contains the bitmask of successful
371 * packets.
372 */
373static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
374 int scale_index, int attempts, int successes)
375{
376 struct iwl_rate_scale_data *window = NULL;
377 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
378 s32 fail_count, tpt;
379
380 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
381 return -EINVAL;
382
383 /* Select window for current tx bit rate */
384 window = &(tbl->win[scale_index]);
385
386 /* Get expected throughput */
387 tpt = get_expected_tpt(tbl, scale_index);
388
389 /*
390 * Keep track of only the latest 62 tx frame attempts in this rate's
391 * history window; anything older isn't really relevant any more.
392 * If we have filled up the sliding window, drop the oldest attempt;
393 * if the oldest attempt (highest bit in bitmap) shows "success",
394 * subtract "1" from the success counter (this is the main reason
395 * we keep these bitmaps!).
396 */
397 while (attempts > 0) {
398 if (window->counter >= IWL_RATE_MAX_WINDOW) {
399 /* remove earliest */
400 window->counter = IWL_RATE_MAX_WINDOW - 1;
401
402 if (window->data & mask) {
403 window->data &= ~mask;
404 window->success_counter--;
405 }
406 }
407
408 /* Increment frames-attempted counter */
409 window->counter++;
410
411 /* Shift bitmap by one frame to throw away oldest history */
412 window->data <<= 1;
413
414 /* Mark the most recent #successes attempts as successful */
415 if (successes > 0) {
416 window->success_counter++;
417 window->data |= 0x1;
418 successes--;
419 }
420
421 attempts--;
422 }
423
424 /* Calculate current success ratio, avoid divide-by-0! */
425 if (window->counter > 0)
426 window->success_ratio = 128 * (100 * window->success_counter)
427 / window->counter;
428 else
429 window->success_ratio = IWL_INVALID_VALUE;
430
431 fail_count = window->counter - window->success_counter;
432
433 /* Calculate average throughput, if we have enough history. */
434 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
435 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
436 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
437 else
438 window->average_tpt = IWL_INVALID_VALUE;
439
8ca151b5
JB		 440 return 0;
441}
442
5aa33553
ES		 443/* Convert rs_rate object into ucode rate bitmask */
444static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
445 struct rs_rate *rate)
8ca151b5 446{
5aa33553
ES		 447 u32 ucode_rate = 0;
448 int index = rate->index;
8ca151b5 449
5aa33553 450 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
d310e405
ES		 451 RATE_MCS_ANT_ABC_MSK);
452
5aa33553
ES		 453 if (is_legacy(rate)) {
454 ucode_rate |= iwl_rates[index].plcp;
8ca151b5 455 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
5aa33553
ES		 456 ucode_rate |= RATE_MCS_CCK_MSK;
457 return ucode_rate;
d310e405
ES		 458 }
459
5aa33553 460 if (is_ht(rate)) {
d310e405 461 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
8ca151b5 462 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
4e82dd3a 463 index = IWL_LAST_HT_RATE;
8ca151b5 464 }
5aa33553 465 ucode_rate |= RATE_MCS_HT_MSK;
8ca151b5 466
5aa33553
ES		 467 if (is_ht_siso(rate))
468 ucode_rate |= iwl_rates[index].plcp_ht_siso;
469 else if (is_ht_mimo2(rate))
470 ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
8ca151b5 471 else
d972ab31 472 WARN_ON_ONCE(1);
5aa33553 473 } else if (is_vht(rate)) {
d310e405
ES		 474 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
475 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
476 index = IWL_LAST_VHT_RATE;
477 }
5aa33553
ES		 478 ucode_rate |= RATE_MCS_VHT_MSK;
479 if (is_vht_siso(rate))
480 ucode_rate |= iwl_rates[index].plcp_vht_siso;
481 else if (is_vht_mimo2(rate))
482 ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
d310e405
ES		 483 else
484 WARN_ON_ONCE(1);
485
8ca151b5 486 } else {
5aa33553 487 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
8ca151b5
JB		 488 }
489
5aa33553
ES		 490 ucode_rate |= rate->bw;
491 if (rate->sgi)
492 ucode_rate |= RATE_MCS_SGI_MSK;
d310e405 493
5aa33553 494 return ucode_rate;
8ca151b5
JB		 495}
496
5aa33553
ES		 497/* Convert a ucode rate into an rs_rate object */
498static int rs_rate_from_ucode_rate(const u32 ucode_rate,
499 enum ieee80211_band band,
500 struct rs_rate *rate)
8ca151b5 501{
5aa33553
ES		 502 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
503 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
d310e405 504 u8 nss;
8ca151b5 505
5aa33553
ES		 506 memset(rate, 0, sizeof(struct rs_rate));
507 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
8ca151b5 508
5aa33553
ES		 509 if (rate->index == IWL_RATE_INVALID) {
510 rate->index = -1;
8ca151b5
JB		 511 return -EINVAL;
512 }
5aa33553
ES		 513
514 rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
8ca151b5 515
d310e405 516 /* Legacy */
5aa33553
ES		 517 if (!(ucode_rate & RATE_MCS_HT_MSK) &&
518 !(ucode_rate & RATE_MCS_VHT_MSK)) {
8ca151b5
JB		 519 if (num_of_ant == 1) {
520 if (band == IEEE80211_BAND_5GHZ)
5aa33553 521 rate->type = LQ_LEGACY_A;
8ca151b5 522 else
5aa33553 523 rate->type = LQ_LEGACY_G;
8ca151b5 524 }
d310e405
ES		 525
526 return 0;
527 }
528
529 /* HT or VHT */
5aa33553
ES		 530 if (ucode_rate & RATE_MCS_SGI_MSK)
531 rate->sgi = true;
d310e405 532
5aa33553 533 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
d310e405 534
5aa33553
ES		 535 if (ucode_rate & RATE_MCS_HT_MSK) {
536 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
d310e405
ES		 537 RATE_HT_MCS_NSS_POS) + 1;
538
539 if (nss == 1) {
5aa33553 540 rate->type = LQ_HT_SISO;
d310e405
ES		 541 WARN_ON_ONCE(num_of_ant != 1);
542 } else if (nss == 2) {
5aa33553 543 rate->type = LQ_HT_MIMO2;
d310e405 544 WARN_ON_ONCE(num_of_ant != 2);
8ca151b5 545 } else {
d310e405
ES		 546 WARN_ON_ONCE(1);
547 }
5aa33553
ES		 548 } else if (ucode_rate & RATE_MCS_VHT_MSK) {
549 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
d310e405
ES		 550 RATE_VHT_MCS_NSS_POS) + 1;
551
552 if (nss == 1) {
5aa33553 553 rate->type = LQ_VHT_SISO;
d310e405
ES		 554 WARN_ON_ONCE(num_of_ant != 1);
555 } else if (nss == 2) {
5aa33553 556 rate->type = LQ_VHT_MIMO2;
d310e405
ES		 557 WARN_ON_ONCE(num_of_ant != 2);
558 } else {
559 WARN_ON_ONCE(1);
8ca151b5
JB		 560 }
561 }
d310e405 562
5aa33553
ES		 563 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
564 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
565 !is_vht(rate));
d310e405 566
8ca151b5
JB		 567 return 0;
568}
569
570/* switch to another antenna/antennas and return 1 */
571/* if no other valid antenna found, return 0 */
5aa33553
ES		 572static int rs_toggle_antenna(u32 valid_ant, u32 *ucode_rate,
573 struct rs_rate *rate)
8ca151b5
JB		 574{
575 u8 new_ant_type;
576
5aa33553 577 if (!rate->ant || rate->ant > ANT_ABC)
8ca151b5
JB		 578 return 0;
579
5aa33553 580 if (!rs_is_valid_ant(valid_ant, rate->ant))
8ca151b5
JB		 581 return 0;
582
5aa33553 583 new_ant_type = ant_toggle_lookup[rate->ant];
8ca151b5 584
5aa33553 585 while ((new_ant_type != rate->ant) &&
8ca151b5
JB		 586 !rs_is_valid_ant(valid_ant, new_ant_type))
587 new_ant_type = ant_toggle_lookup[new_ant_type];
588
5aa33553 589 if (new_ant_type == rate->ant)
8ca151b5
JB		 590 return 0;
591
5aa33553
ES		 592 rate->ant = new_ant_type;
593
594 /* TODO: get rid of ucode_rate here. This should handle only rs_rate */
595 *ucode_rate &= ~RATE_MCS_ANT_ABC_MSK;
596 *ucode_rate |= new_ant_type << RATE_MCS_ANT_POS;
8ca151b5
JB		 597 return 1;
598}
599
8ca151b5 600static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
5aa33553 601 struct rs_rate *rate)
8ca151b5 602{
5aa33553 603 if (is_legacy(rate))
8ca151b5 604 return lq_sta->active_legacy_rate;
5aa33553 605 else if (is_siso(rate))
d310e405 606 return lq_sta->active_siso_rate;
5aa33553 607 else if (is_mimo2(rate))
d310e405
ES		 608 return lq_sta->active_mimo2_rate;
609
610 WARN_ON_ONCE(1);
611 return 0;
8ca151b5
JB		 612}
613
614static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
615 int rate_type)
616{
617 u8 high = IWL_RATE_INVALID;
618 u8 low = IWL_RATE_INVALID;
619
620 /* 802.11A or ht walks to the next literal adjacent rate in
621 * the rate table */
5aa33553 622 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
8ca151b5
JB		 623 int i;
624 u32 mask;
625
626 /* Find the previous rate that is in the rate mask */
627 i = index - 1;
628 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
629 if (rate_mask & mask) {
630 low = i;
631 break;
632 }
633 }
634
635 /* Find the next rate that is in the rate mask */
636 i = index + 1;
637 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
638 if (rate_mask & mask) {
639 high = i;
640 break;
641 }
642 }
643
644 return (high << 8) | low;
645 }
646
647 low = index;
648 while (low != IWL_RATE_INVALID) {
649 low = iwl_rates[low].prev_rs;
650 if (low == IWL_RATE_INVALID)
651 break;
652 if (rate_mask & (1 << low))
653 break;
654 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
655 }
656
657 high = index;
658 while (high != IWL_RATE_INVALID) {
659 high = iwl_rates[high].next_rs;
660 if (high == IWL_RATE_INVALID)
661 break;
662 if (rate_mask & (1 << high))
663 break;
664 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
665 }
666
667 return (high << 8) | low;
668}
669
670static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
5aa33553 671 struct rs_rate *rate,
8ca151b5
JB		 672 u8 scale_index, u8 ht_possible)
673{
674 s32 low;
675 u16 rate_mask;
676 u16 high_low;
677 u8 switch_to_legacy = 0;
8ca151b5
JB		 678 struct iwl_mvm *mvm = lq_sta->drv;
679
680 /* check if we need to switch from HT to legacy rates.
681 * assumption is that mandatory rates (1Mbps or 6Mbps)
682 * are always supported (spec demand) */
5aa33553 683 if (!is_legacy(rate) && (!ht_possible || !scale_index)) {
8ca151b5
JB		 684 switch_to_legacy = 1;
685 scale_index = rs_ht_to_legacy[scale_index];
686 if (lq_sta->band == IEEE80211_BAND_5GHZ)
5aa33553 687 rate->type = LQ_LEGACY_A;
8ca151b5 688 else
5aa33553 689 rate->type = LQ_LEGACY_G;
8ca151b5 690
5aa33553
ES		 691 if (num_of_ant(rate->ant) > 1)
692 rate->ant =
ff402312 693 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
8ca151b5 694
5aa33553
ES		 695 rate->bw = 0;
696 rate->sgi = false;
8ca151b5
JB		 697 }
698
a8ff14f5 699 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5
JB		 700
701 /* Mask with station rate restriction */
5aa33553 702 if (is_legacy(rate)) {
8ca151b5
JB		 703 /* supp_rates has no CCK bits in A mode */
704 if (lq_sta->band == IEEE80211_BAND_5GHZ)
5aa33553 705 rate_mask = (u16)(rate_mask &
8ca151b5
JB		 706 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
707 else
708 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
709 }
710
711 /* If we switched from HT to legacy, check current rate */
712 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
713 low = scale_index;
714 goto out;
715 }
716
717 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
5aa33553 718 rate->type);
8ca151b5
JB		 719 low = high_low & 0xff;
720
721 if (low == IWL_RATE_INVALID)
722 low = scale_index;
723
724out:
5aa33553
ES		 725 rate->index = low;
726 return ucode_rate_from_rs_rate(lq_sta->drv, rate);
8ca151b5
JB		 727}
728
5aa33553
ES		 729/* Simple function to compare two rate scale table types */
730static inline bool rs_rate_match(struct rs_rate *a,
731 struct rs_rate *b)
8ca151b5 732{
5aa33553 733 return (a->type == b->type) && (a->ant == b->ant) && (a->sgi == b->sgi);
8ca151b5
JB		 734}
735
d310e405
ES		 736static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
737{
738 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
739 return RATE_MCS_CHAN_WIDTH_40;
740 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
741 return RATE_MCS_CHAN_WIDTH_80;
742 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
743 return RATE_MCS_CHAN_WIDTH_160;
744
745 return RATE_MCS_CHAN_WIDTH_20;
746}
747
8ca151b5
JB		 748/*
749 * mac80211 sends us Tx status
750 */
751static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
752 struct ieee80211_sta *sta, void *priv_sta,
753 struct sk_buff *skb)
754{
755 int legacy_success;
756 int retries;
5aa33553 757 int mac_index, i;
8ca151b5
JB		 758 struct iwl_lq_sta *lq_sta = priv_sta;
759 struct iwl_lq_cmd *table;
760 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
761 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
762 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
763 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
764 enum mac80211_rate_control_flags mac_flags;
5aa33553
ES		 765 u32 ucode_rate;
766 struct rs_rate rate;
8ca151b5
JB		 767 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
768
8ca151b5
JB		 769 /* Treat uninitialized rate scaling data same as non-existing. */
770 if (!lq_sta) {
771 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
772 return;
773 } else if (!lq_sta->drv) {
774 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
775 return;
776 }
777
778 if (!ieee80211_is_data(hdr->frame_control) ||
779 info->flags & IEEE80211_TX_CTL_NO_ACK)
780 return;
781
782 /* This packet was aggregated but doesn't carry status info */
783 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
784 !(info->flags & IEEE80211_TX_STAT_AMPDU))
785 return;
786
787 /*
788 * Ignore this Tx frame response if its initial rate doesn't match
789 * that of latest Link Quality command. There may be stragglers
790 * from a previous Link Quality command, but we're no longer interested
791 * in those; they're either from the "active" mode while we're trying
792 * to check "search" mode, or a prior "search" mode after we've moved
793 * to a new "search" mode (which might become the new "active" mode).
794 */
795 table = &lq_sta->lq;
5aa33553
ES		 796 ucode_rate = le32_to_cpu(table->rs_table[0]);
797 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5 798 if (info->band == IEEE80211_BAND_5GHZ)
5aa33553 799 rate.index -= IWL_FIRST_OFDM_RATE;
8ca151b5
JB		 800 mac_flags = info->status.rates[0].flags;
801 mac_index = info->status.rates[0].idx;
802 /* For HT packets, map MCS to PLCP */
803 if (mac_flags & IEEE80211_TX_RC_MCS) {
804 /* Remove # of streams */
805 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
806 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
807 mac_index++;
808 /*
809 * mac80211 HT index is always zero-indexed; we need to move
810 * HT OFDM rates after CCK rates in 2.4 GHz band
811 */
812 if (info->band == IEEE80211_BAND_2GHZ)
813 mac_index += IWL_FIRST_OFDM_RATE;
d310e405
ES		 814 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
815 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
816 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
817 mac_index++;
8ca151b5 818 }
d310e405 819
8ca151b5
JB		 820 /* Here we actually compare this rate to the latest LQ command */
821 if ((mac_index < 0) ||
5aa33553
ES		 822 (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
823 (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
824 (rate.ant != info->status.antenna) ||
825 (!!(ucode_rate & RATE_MCS_HT_MSK) !=
d310e405 826 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
5aa33553 827 (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
d310e405 828 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
5aa33553 829 (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
d310e405 830 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
5aa33553 831 (rate.index != mac_index)) {
8ca151b5
JB		 832 IWL_DEBUG_RATE(mvm,
833 "initial rate %d does not match %d (0x%x)\n",
5aa33553 834 mac_index, rate.index, ucode_rate);
8ca151b5
JB		 835 /*
836 * Since rates mis-match, the last LQ command may have failed.
837 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
838 * ... driver.
839 */
840 lq_sta->missed_rate_counter++;
841 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
842 lq_sta->missed_rate_counter = 0;
9e680946 843 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 844 }
845 /* Regardless, ignore this status info for outdated rate */
846 return;
847 } else
848 /* Rate did match, so reset the missed_rate_counter */
849 lq_sta->missed_rate_counter = 0;
850
851 /* Figure out if rate scale algorithm is in active or search table */
5aa33553
ES		 852 if (rs_rate_match(&rate,
853 &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
8ca151b5
JB		 854 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
855 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553
ES		 856 } else if (rs_rate_match(&rate,
857 &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
8ca151b5
JB		 858 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
859 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
860 } else {
861 IWL_DEBUG_RATE(mvm,
862 "Neither active nor search matches tx rate\n");
863 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 864 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
8ca151b5 865 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
5aa33553
ES		 866 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
867 rs_dump_rate(mvm, &rate, "ACTUAL");
868
8ca151b5
JB		 869 /*
870 * no matching table found, let's by-pass the data collection
871 * and continue to perform rate scale to find the rate table
872 */
873 rs_stay_in_table(lq_sta, true);
874 goto done;
875 }
876
877 /*
878 * Updating the frame history depends on whether packets were
879 * aggregated.
880 *
881 * For aggregation, all packets were transmitted at the same rate, the
882 * first index into rate scale table.
883 */
884 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
5aa33553
ES		 885 ucode_rate = le32_to_cpu(table->rs_table[0]);
886 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
887 rs_collect_tx_data(curr_tbl, rate.index,
8ca151b5
JB		 888 info->status.ampdu_len,
889 info->status.ampdu_ack_len);
890
891 /* Update success/fail counts if not searching for new mode */
892 if (lq_sta->stay_in_tbl) {
893 lq_sta->total_success += info->status.ampdu_ack_len;
894 lq_sta->total_failed += (info->status.ampdu_len -
895 info->status.ampdu_ack_len);
896 }
897 } else {
898 /*
899 * For legacy, update frame history with for each Tx retry.
900 */
901 retries = info->status.rates[0].count - 1;
902 /* HW doesn't send more than 15 retries */
903 retries = min(retries, 15);
904
905 /* The last transmission may have been successful */
906 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
907 /* Collect data for each rate used during failed TX attempts */
908 for (i = 0; i <= retries; ++i) {
5aa33553
ES		 909 ucode_rate = le32_to_cpu(table->rs_table[i]);
910 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
8ca151b5
JB		 911 /*
912 * Only collect stats if retried rate is in the same RS
913 * table as active/search.
914 */
5aa33553 915 if (rs_rate_match(&rate, &curr_tbl->rate))
8ca151b5 916 tmp_tbl = curr_tbl;
5aa33553 917 else if (rs_rate_match(&rate, &other_tbl->rate))
8ca151b5
JB		 918 tmp_tbl = other_tbl;
919 else
920 continue;
5aa33553 921 rs_collect_tx_data(tmp_tbl, rate.index, 1,
8ca151b5
JB		 922 i < retries ? 0 : legacy_success);
923 }
924
925 /* Update success/fail counts if not searching for new mode */
926 if (lq_sta->stay_in_tbl) {
927 lq_sta->total_success += legacy_success;
928 lq_sta->total_failed += retries + (1 - legacy_success);
929 }
930 }
931 /* The last TX rate is cached in lq_sta; it's set in if/else above */
5aa33553 932 lq_sta->last_rate_n_flags = ucode_rate;
8ca151b5
JB		 933done:
934 /* See if there's a better rate or modulation mode to try. */
935 if (sta && sta->supp_rates[sband->band])
936 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
937}
938
939/*
940 * Begin a period of staying with a selected modulation mode.
941 * Set "stay_in_tbl" flag to prevent any mode switches.
942 * Set frame tx success limits according to legacy vs. high-throughput,
943 * and reset overall (spanning all rates) tx success history statistics.
944 * These control how long we stay using same modulation mode before
945 * searching for a new mode.
946 */
947static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
948 struct iwl_lq_sta *lq_sta)
949{
950 IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
951 lq_sta->stay_in_tbl = 1; /* only place this gets set */
952 if (is_legacy) {
953 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
954 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
955 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
956 } else {
957 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
958 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
959 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
960 }
961 lq_sta->table_count = 0;
962 lq_sta->total_failed = 0;
963 lq_sta->total_success = 0;
964 lq_sta->flush_timer = jiffies;
965 lq_sta->action_counter = 0;
966}
967
968/*
969 * Find correct throughput table for given mode of modulation
970 */
971static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
972 struct iwl_scale_tbl_info *tbl)
973{
974 /* Used to choose among HT tables */
975 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
5aa33553 976 struct rs_rate *rate = &tbl->rate;
8ca151b5
JB		 977
978 /* Check for invalid LQ type */
5aa33553
ES		 979 if (WARN_ON_ONCE(!is_legacy(rate) && !is_ht(rate) &&
980 !(is_vht(rate)))) {
8ca151b5
JB		 981 tbl->expected_tpt = expected_tpt_legacy;
982 return;
983 }
984
985 /* Legacy rates have only one table */
5aa33553 986 if (is_legacy(rate)) {
8ca151b5
JB		 987 tbl->expected_tpt = expected_tpt_legacy;
988 return;
989 }
990
d310e405 991 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
8ca151b5 992 /* Choose among many HT tables depending on number of streams
d310e405 993 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
8ca151b5 994 * status */
5aa33553
ES		 995 if (is_siso(rate)) {
996 switch (rate->bw) {
d310e405
ES		 997 case RATE_MCS_CHAN_WIDTH_20:
998 ht_tbl_pointer = expected_tpt_siso_20MHz;
999 break;
1000 case RATE_MCS_CHAN_WIDTH_40:
1001 ht_tbl_pointer = expected_tpt_siso_40MHz;
1002 break;
1003 case RATE_MCS_CHAN_WIDTH_80:
1004 ht_tbl_pointer = expected_tpt_siso_80MHz;
1005 break;
1006 default:
1007 WARN_ON_ONCE(1);
1008 }
5aa33553
ES		 1009 } else if (is_mimo2(rate)) {
1010 switch (rate->bw) {
d310e405
ES		 1011 case RATE_MCS_CHAN_WIDTH_20:
1012 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1013 break;
1014 case RATE_MCS_CHAN_WIDTH_40:
1015 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1016 break;
1017 case RATE_MCS_CHAN_WIDTH_80:
1018 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1019 break;
1020 default:
1021 WARN_ON_ONCE(1);
1022 }
1023 } else {
1024 WARN_ON_ONCE(1);
d972ab31 1025 }
8ca151b5 1026
5aa33553 1027 if (!rate->sgi && !lq_sta->is_agg) /* Normal */
8ca151b5 1028 tbl->expected_tpt = ht_tbl_pointer[0];
5aa33553 1029 else if (rate->sgi && !lq_sta->is_agg) /* SGI */
8ca151b5 1030 tbl->expected_tpt = ht_tbl_pointer[1];
5aa33553 1031 else if (!rate->sgi && lq_sta->is_agg) /* AGG */
8ca151b5
JB		 1032 tbl->expected_tpt = ht_tbl_pointer[2];
1033 else /* AGG+SGI */
1034 tbl->expected_tpt = ht_tbl_pointer[3];
1035}
1036
1037/*
1038 * Find starting rate for new "search" high-throughput mode of modulation.
1039 * Goal is to find lowest expected rate (under perfect conditions) that is
1040 * above the current measured throughput of "active" mode, to give new mode
1041 * a fair chance to prove itself without too many challenges.
1042 *
1043 * This gets called when transitioning to more aggressive modulation
1044 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1045 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1046 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1047 * bit rate will typically need to increase, but not if performance was bad.
1048 */
1049static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1050 struct iwl_lq_sta *lq_sta,
1051 struct iwl_scale_tbl_info *tbl, /* "search" */
1052 u16 rate_mask, s8 index)
1053{
1054 /* "active" values */
1055 struct iwl_scale_tbl_info *active_tbl =
1056 &(lq_sta->lq_info[lq_sta->active_tbl]);
1057 s32 active_sr = active_tbl->win[index].success_ratio;
1058 s32 active_tpt = active_tbl->expected_tpt[index];
1059
1060 /* expected "search" throughput */
1061 s32 *tpt_tbl = tbl->expected_tpt;
1062
1063 s32 new_rate, high, low, start_hi;
1064 u16 high_low;
1065 s8 rate = index;
1066
1067 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1068
1069 while (1) {
1070 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
5aa33553 1071 tbl->rate.type);
8ca151b5
JB		 1072
1073 low = high_low & 0xff;
1074 high = (high_low >> 8) & 0xff;
1075
1076 /*
1077 * Lower the "search" bit rate, to give new "search" mode
1078 * approximately the same throughput as "active" if:
1079 *
1080 * 1) "Active" mode has been working modestly well (but not
1081 * great), and expected "search" throughput (under perfect
1082 * conditions) at candidate rate is above the actual
1083 * measured "active" throughput (but less than expected
1084 * "active" throughput under perfect conditions).
1085 * OR
1086 * 2) "Active" mode has been working perfectly or very well
1087 * and expected "search" throughput (under perfect
1088 * conditions) at candidate rate is above expected
1089 * "active" throughput (under perfect conditions).
1090 */
1091 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
c48075d2 1092 ((active_sr > RS_SR_FORCE_DECREASE) &&
8ca151b5
JB		 1093 (active_sr <= IWL_RATE_HIGH_TH) &&
1094 (tpt_tbl[rate] <= active_tpt))) ||
1095 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1096 (tpt_tbl[rate] > active_tpt))) {
1097 /* (2nd or later pass)
1098 * If we've already tried to raise the rate, and are
1099 * now trying to lower it, use the higher rate. */
1100 if (start_hi != IWL_RATE_INVALID) {
1101 new_rate = start_hi;
1102 break;
1103 }
1104
1105 new_rate = rate;
1106
1107 /* Loop again with lower rate */
1108 if (low != IWL_RATE_INVALID)
1109 rate = low;
1110
1111 /* Lower rate not available, use the original */
1112 else
1113 break;
1114
1115 /* Else try to raise the "search" rate to match "active" */
1116 } else {
1117 /* (2nd or later pass)
1118 * If we've already tried to lower the rate, and are
1119 * now trying to raise it, use the lower rate. */
1120 if (new_rate != IWL_RATE_INVALID)
1121 break;
1122
1123 /* Loop again with higher rate */
1124 else if (high != IWL_RATE_INVALID) {
1125 start_hi = high;
1126 rate = high;
1127
1128 /* Higher rate not available, use the original */
1129 } else {
1130 new_rate = rate;
1131 break;
1132 }
1133 }
1134 }
1135
1136 return new_rate;
1137}
1138
4837b448
ES		 1139/* Move to the next action and wrap around to the first action in case
1140 * we're at the last action. Assumes actions start at 0.
1141 */
1142static inline void rs_move_next_action(struct iwl_scale_tbl_info *tbl,
1143 u8 last_action)
1144{
1145 BUILD_BUG_ON(IWL_LEGACY_FIRST_ACTION != 0);
1146 BUILD_BUG_ON(IWL_SISO_FIRST_ACTION != 0);
1147 BUILD_BUG_ON(IWL_MIMO2_FIRST_ACTION != 0);
1148
1149 tbl->action = (tbl->action + 1) % (last_action + 1);
1150}
1151
5aa33553 1152static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
d310e405
ES		 1153{
1154 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
5aa33553 1155 return RATE_MCS_CHAN_WIDTH_80;
d310e405 1156 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
5aa33553
ES		 1157 return RATE_MCS_CHAN_WIDTH_40;
1158
1159 return RATE_MCS_CHAN_WIDTH_20;
d310e405
ES		 1160}
1161
5aa33553 1162static bool rs_sgi_allowed(struct rs_rate *rate,
d310e405
ES		 1163 struct ieee80211_sta *sta)
1164{
1165 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1166 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
1167
5aa33553 1168 if (is_ht20(rate) && (ht_cap->cap &
d310e405
ES		 1169 IEEE80211_HT_CAP_SGI_20))
1170 return true;
5aa33553 1171 if (is_ht40(rate) && (ht_cap->cap &
d310e405
ES		 1172 IEEE80211_HT_CAP_SGI_40))
1173 return true;
5aa33553 1174 if (is_ht80(rate) && (vht_cap->cap &
d310e405
ES		 1175 IEEE80211_VHT_CAP_SHORT_GI_80))
1176 return true;
1177
1178 return false;
1179}
1180
8ca151b5
JB		 1181/*
1182 * Set up search table for MIMO2
1183 */
1184static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1185 struct iwl_lq_sta *lq_sta,
1186 struct ieee80211_sta *sta,
1187 struct iwl_scale_tbl_info *tbl, int index)
1188{
1189 u16 rate_mask;
5aa33553 1190 s32 rate_idx;
8ca151b5
JB		 1191
1192 if (!sta->ht_cap.ht_supported)
1193 return -1;
1194
af0ed69b 1195 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
8ca151b5
JB		 1196 return -1;
1197
1198 /* Need both Tx chains/antennas to support MIMO */
ff402312 1199 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
8ca151b5
JB		 1200 return -1;
1201
1202 IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1203
5aa33553 1204 tbl->rate.type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
8ca151b5
JB		 1205 tbl->action = 0;
1206 tbl->max_search = IWL_MAX_SEARCH;
1207 rate_mask = lq_sta->active_mimo2_rate;
1208
5aa33553 1209 tbl->rate.bw = rs_bw_from_sta_bw(sta);
8ca151b5
JB		 1210 rs_set_expected_tpt_table(lq_sta, tbl);
1211
5aa33553 1212 rate_idx = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
8ca151b5
JB		 1213
1214 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
5aa33553
ES		 1215 rate_idx, rate_mask);
1216 if ((rate_idx == IWL_RATE_INVALID) || !((1 << rate_idx) & rate_mask)) {
8ca151b5 1217 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
5aa33553 1218 rate_idx, rate_mask);
8ca151b5
JB		 1219 return -1;
1220 }
5aa33553
ES		 1221
1222 tbl->rate.index = rate_idx;
1223 tbl->current_rate = ucode_rate_from_rs_rate(mvm, &tbl->rate);
8ca151b5 1224
6a524f48
ES		 1225 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index\n",
1226 tbl->current_rate);
8ca151b5
JB		 1227 return 0;
1228}
1229
8ca151b5
JB		 1230/*
1231 * Set up search table for SISO
1232 */
1233static int rs_switch_to_siso(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;
5aa33553 1239 s32 rate_idx;
8ca151b5
JB		 1240
1241 if (!sta->ht_cap.ht_supported)
1242 return -1;
1243
1244 IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1245
5aa33553 1246 tbl->rate.type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
8ca151b5
JB		 1247 tbl->action = 0;
1248 tbl->max_search = IWL_MAX_SEARCH;
1249 rate_mask = lq_sta->active_siso_rate;
1250
5aa33553 1251 tbl->rate.bw = rs_bw_from_sta_bw(sta);
8ca151b5 1252 rs_set_expected_tpt_table(lq_sta, tbl);
5aa33553 1253 rate_idx = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
8ca151b5 1254
5aa33553
ES		 1255 IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n",
1256 rate_idx, rate_mask);
1257 if ((rate_idx == IWL_RATE_INVALID) || !((1 << rate_idx) & rate_mask)) {
8ca151b5
JB		 1258 IWL_DEBUG_RATE(mvm,
1259 "can not switch with index %d rate mask %x\n",
5aa33553 1260 rate_idx, rate_mask);
8ca151b5
JB		 1261 return -1;
1262 }
5aa33553
ES		 1263
1264 tbl->rate.index = rate_idx;
1265 tbl->current_rate = ucode_rate_from_rs_rate(mvm, &tbl->rate);
1266
6a524f48
ES		 1267 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index\n",
1268 tbl->current_rate);
8ca151b5
JB		 1269 return 0;
1270}
1271
1272/*
1273 * Try to switch to new modulation mode from legacy
1274 */
1275static int rs_move_legacy_other(struct iwl_mvm *mvm,
1276 struct iwl_lq_sta *lq_sta,
1277 struct ieee80211_sta *sta,
1278 int index)
1279{
1280 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1281 struct iwl_scale_tbl_info *search_tbl =
1282 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
5aa33553 1283 struct rs_rate *rate = &search_tbl->rate;
8ca151b5
JB		 1284 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1285 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1286 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1287 u8 start_action;
ff402312 1288 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1289 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1290 int ret;
1291 u8 update_search_tbl_counter = 0;
1292
1293 start_action = tbl->action;
1294 while (1) {
1295 lq_sta->action_counter++;
1296 switch (tbl->action) {
4837b448 1297 case IWL_LEGACY_SWITCH_ANTENNA:
8ca151b5
JB		 1298 IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1299
4837b448 1300 if (tx_chains_num <= 1)
8ca151b5
JB		 1301 break;
1302
1303 /* Don't change antenna if success has been great */
1304 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1305 break;
1306
1307 /* Set up search table to try other antenna */
1308 memcpy(search_tbl, tbl, sz);
1309
1310 if (rs_toggle_antenna(valid_tx_ant,
1311 &search_tbl->current_rate,
5aa33553 1312 &search_tbl->rate)) {
8ca151b5
JB		 1313 update_search_tbl_counter = 1;
1314 rs_set_expected_tpt_table(lq_sta, search_tbl);
1315 goto out;
1316 }
1317 break;
1318 case IWL_LEGACY_SWITCH_SISO:
1319 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1320
1321 /* Set up search table to try SISO */
1322 memcpy(search_tbl, tbl, sz);
5aa33553 1323 rate->sgi = false;
8ca151b5
JB		 1324 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1325 search_tbl, index);
1326 if (!ret) {
1327 lq_sta->action_counter = 0;
1328 goto out;
1329 }
1330
1331 break;
d972ab31 1332 case IWL_LEGACY_SWITCH_MIMO2:
8ca151b5
JB		 1333 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1334
1335 /* Set up search table to try MIMO */
1336 memcpy(search_tbl, tbl, sz);
5aa33553
ES		 1337 rate->sgi = false;
1338 rate->ant = ANT_AB;
8ca151b5
JB		 1339
1340 if (!rs_is_valid_ant(valid_tx_ant,
5aa33553 1341 rate->ant))
8ca151b5
JB		 1342 break;
1343
1344 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1345 search_tbl, index);
1346 if (!ret) {
1347 lq_sta->action_counter = 0;
1348 goto out;
1349 }
1350 break;
d972ab31
ES		 1351 default:
1352 WARN_ON_ONCE(1);
8ca151b5 1353 }
4837b448 1354 rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
8ca151b5
JB		 1355
1356 if (tbl->action == start_action)
1357 break;
1358 }
5aa33553 1359 rate->type = LQ_NONE;
8ca151b5
JB		 1360 return 0;
1361
1362out:
1363 lq_sta->search_better_tbl = 1;
4837b448 1364 rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
8ca151b5
JB		 1365 if (update_search_tbl_counter)
1366 search_tbl->action = tbl->action;
1367 return 0;
1368}
1369
1370/*
1371 * Try to switch to new modulation mode from SISO
1372 */
1373static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1374 struct iwl_lq_sta *lq_sta,
1375 struct ieee80211_sta *sta, int index)
1376{
8ca151b5
JB		 1377 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1378 struct iwl_scale_tbl_info *search_tbl =
1379 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
5aa33553 1380 struct rs_rate *rate = &search_tbl->rate;
8ca151b5 1381 struct iwl_rate_scale_data *window = &(tbl->win[index]);
8ca151b5
JB		 1382 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1383 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1384 u8 start_action;
ff402312 1385 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1386 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1387 u8 update_search_tbl_counter = 0;
1388 int ret;
1389
ffa6c707
EG		 1390 if (tbl->action == IWL_SISO_SWITCH_MIMO2 &&
1391 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
22f6642c 1392 tbl->action = IWL_SISO_SWITCH_ANTENNA;
36946ce6 1393
8ca151b5
JB		 1394 start_action = tbl->action;
1395 while (1) {
1396 lq_sta->action_counter++;
1397 switch (tbl->action) {
4837b448 1398 case IWL_SISO_SWITCH_ANTENNA:
8ca151b5 1399 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
4837b448 1400 if (tx_chains_num <= 1)
8ca151b5
JB		 1401 break;
1402
36946ce6
EG		 1403 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1404 BT_MBOX_MSG(&mvm->last_bt_notif, 3,
1405 TRAFFIC_LOAD) == 0)
8ca151b5
JB		 1406 break;
1407
1408 memcpy(search_tbl, tbl, sz);
1409 if (rs_toggle_antenna(valid_tx_ant,
1410 &search_tbl->current_rate,
5aa33553 1411 rate)) {
8ca151b5
JB		 1412 update_search_tbl_counter = 1;
1413 goto out;
1414 }
1415 break;
d972ab31 1416 case IWL_SISO_SWITCH_MIMO2:
8ca151b5
JB		 1417 IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1418 memcpy(search_tbl, tbl, sz);
5aa33553
ES		 1419 rate->sgi = false;
1420 rate->ant = ANT_AB;
8ca151b5
JB		 1421
1422 if (!rs_is_valid_ant(valid_tx_ant,
5aa33553 1423 rate->ant))
8ca151b5
JB		 1424 break;
1425
1426 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1427 search_tbl, index);
1428 if (!ret)
1429 goto out;
1430 break;
1431 case IWL_SISO_SWITCH_GI:
5aa33553 1432 if (!rs_sgi_allowed(rate, sta))
8ca151b5
JB		 1433 break;
1434
1435 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1436
1437 memcpy(search_tbl, tbl, sz);
5aa33553 1438 rate->sgi = !tbl->rate.sgi;
8ca151b5 1439 rs_set_expected_tpt_table(lq_sta, search_tbl);
5aa33553 1440 if (tbl->rate.sgi) {
8ca151b5
JB		 1441 s32 tpt = lq_sta->last_tpt / 100;
1442 if (tpt >= search_tbl->expected_tpt[index])
1443 break;
1444 }
5aa33553 1445 rate->index = index;
8ca151b5 1446 search_tbl->current_rate =
5aa33553 1447 ucode_rate_from_rs_rate(mvm, rate);
8ca151b5
JB		 1448 update_search_tbl_counter = 1;
1449 goto out;
d972ab31
ES		 1450 default:
1451 WARN_ON_ONCE(1);
8ca151b5 1452 }
4837b448 1453 rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
8ca151b5
JB		 1454
1455 if (tbl->action == start_action)
1456 break;
1457 }
5aa33553 1458 rate->type = LQ_NONE;
8ca151b5
JB		 1459 return 0;
1460
1461 out:
1462 lq_sta->search_better_tbl = 1;
4837b448 1463 rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
8ca151b5
JB		 1464 if (update_search_tbl_counter)
1465 search_tbl->action = tbl->action;
1466
1467 return 0;
1468}
1469
1470/*
1471 * Try to switch to new modulation mode from MIMO2
1472 */
1473static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1474 struct iwl_lq_sta *lq_sta,
1475 struct ieee80211_sta *sta, int index)
1476{
8ca151b5
JB		 1477 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1478 struct iwl_scale_tbl_info *search_tbl =
1479 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
5aa33553 1480 struct rs_rate *rate = &search_tbl->rate;
8ca151b5
JB		 1481 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1482 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1483 u8 start_action;
ff402312 1484 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1485 u8 update_search_tbl_counter = 0;
1486 int ret;
1487
4d30ee82
ES		 1488 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
1489 IWL_DEBUG_RATE(mvm, "BT COEX force switch to SISO A\n");
393b9e5b 1490 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
4d30ee82 1491 }
393b9e5b 1492
8ca151b5
JB		 1493 start_action = tbl->action;
1494 while (1) {
1495 lq_sta->action_counter++;
1496 switch (tbl->action) {
8ca151b5
JB		 1497 case IWL_MIMO2_SWITCH_SISO_A:
1498 case IWL_MIMO2_SWITCH_SISO_B:
8ca151b5
JB		 1499 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1500
1501 /* Set up new search table for SISO */
1502 memcpy(search_tbl, tbl, sz);
1503
1504 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
5aa33553 1505 rate->ant = ANT_A;
d972ab31 1506 else /* tbl->action == IWL_MIMO2_SWITCH_SISO_B */
5aa33553 1507 rate->ant = ANT_B;
8ca151b5
JB		 1508
1509 if (!rs_is_valid_ant(valid_tx_ant,
5aa33553 1510 rate->ant))
8ca151b5
JB		 1511 break;
1512
1513 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1514 search_tbl, index);
1515 if (!ret)
1516 goto out;
1517
1518 break;
1519
1520 case IWL_MIMO2_SWITCH_GI:
5aa33553 1521 if (!rs_sgi_allowed(rate, sta))
8ca151b5
JB		 1522 break;
1523
1524 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1525
1526 /* Set up new search table for MIMO2 */
1527 memcpy(search_tbl, tbl, sz);
5aa33553 1528 rate->sgi = !tbl->rate.sgi;
8ca151b5
JB		 1529 rs_set_expected_tpt_table(lq_sta, search_tbl);
1530 /*
1531 * If active table already uses the fastest possible
1532 * modulation (dual stream with short guard interval),
1533 * and it's working well, there's no need to look
1534 * for a better type of modulation!
1535 */
5aa33553 1536 if (tbl->rate.sgi) {
8ca151b5
JB		 1537 s32 tpt = lq_sta->last_tpt / 100;
1538 if (tpt >= search_tbl->expected_tpt[index])
1539 break;
1540 }
5aa33553 1541 rate->index = index;
8ca151b5 1542 search_tbl->current_rate =
5aa33553 1543 ucode_rate_from_rs_rate(mvm, rate);
8ca151b5
JB		 1544 update_search_tbl_counter = 1;
1545 goto out;
d972ab31
ES		 1546 default:
1547 WARN_ON_ONCE(1);
8ca151b5 1548 }
4837b448 1549 rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
8ca151b5
JB		 1550
1551 if (tbl->action == start_action)
1552 break;
1553 }
5aa33553 1554 rate->type = LQ_NONE;
8ca151b5
JB		 1555 return 0;
1556 out:
1557 lq_sta->search_better_tbl = 1;
4837b448 1558 rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
8ca151b5
JB		 1559 if (update_search_tbl_counter)
1560 search_tbl->action = tbl->action;
1561
1562 return 0;
1563}
1564
8ca151b5
JB		 1565/*
1566 * Check whether we should continue using same modulation mode, or
1567 * begin search for a new mode, based on:
1568 * 1) # tx successes or failures while using this mode
1569 * 2) # times calling this function
1570 * 3) elapsed time in this mode (not used, for now)
1571 */
1572static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1573{
1574 struct iwl_scale_tbl_info *tbl;
1575 int i;
1576 int active_tbl;
1577 int flush_interval_passed = 0;
1578 struct iwl_mvm *mvm;
1579
1580 mvm = lq_sta->drv;
1581 active_tbl = lq_sta->active_tbl;
1582
1583 tbl = &(lq_sta->lq_info[active_tbl]);
1584
1585 /* If we've been disallowing search, see if we should now allow it */
1586 if (lq_sta->stay_in_tbl) {
1587 /* Elapsed time using current modulation mode */
1588 if (lq_sta->flush_timer)
1589 flush_interval_passed =
1590 time_after(jiffies,
1591 (unsigned long)(lq_sta->flush_timer +
32b01726 1592 RS_STAY_IN_COLUMN_TIMEOUT));
8ca151b5
JB		 1593
1594 /*
1595 * Check if we should allow search for new modulation mode.
1596 * If many frames have failed or succeeded, or we've used
1597 * this same modulation for a long time, allow search, and
1598 * reset history stats that keep track of whether we should
1599 * allow a new search. Also (below) reset all bitmaps and
1600 * stats in active history.
1601 */
1602 if (force_search ||
1603 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1604 (lq_sta->total_success > lq_sta->max_success_limit) ||
1605 ((!lq_sta->search_better_tbl) &&
1606 (lq_sta->flush_timer) && (flush_interval_passed))) {
1607 IWL_DEBUG_RATE(mvm,
1608 "LQ: stay is expired %d %d %d\n",
1609 lq_sta->total_failed,
1610 lq_sta->total_success,
1611 flush_interval_passed);
1612
1613 /* Allow search for new mode */
1614 lq_sta->stay_in_tbl = 0; /* only place reset */
1615 lq_sta->total_failed = 0;
1616 lq_sta->total_success = 0;
1617 lq_sta->flush_timer = 0;
1618 /*
1619 * Else if we've used this modulation mode enough repetitions
1620 * (regardless of elapsed time or success/failure), reset
1621 * history bitmaps and rate-specific stats for all rates in
1622 * active table.
1623 */
1624 } else {
1625 lq_sta->table_count++;
1626 if (lq_sta->table_count >=
1627 lq_sta->table_count_limit) {
1628 lq_sta->table_count = 0;
1629
1630 IWL_DEBUG_RATE(mvm,
1631 "LQ: stay in table clear win\n");
1632 for (i = 0; i < IWL_RATE_COUNT; i++)
1633 rs_rate_scale_clear_window(
1634 &(tbl->win[i]));
1635 }
1636 }
1637
1638 /* If transitioning to allow "search", reset all history
1639 * bitmaps and stats in active table (this will become the new
1640 * "search" table). */
1641 if (!lq_sta->stay_in_tbl) {
1642 for (i = 0; i < IWL_RATE_COUNT; i++)
1643 rs_rate_scale_clear_window(&(tbl->win[i]));
1644 }
1645 }
1646}
1647
1648/*
1649 * setup rate table in uCode
1650 */
1651static void rs_update_rate_tbl(struct iwl_mvm *mvm,
9145d151 1652 struct ieee80211_sta *sta,
8ca151b5 1653 struct iwl_lq_sta *lq_sta,
5aa33553 1654 struct rs_rate *rate)
8ca151b5 1655{
5aa33553 1656 u32 ucode_rate;
8ca151b5 1657
5aa33553
ES		 1658 ucode_rate = ucode_rate_from_rs_rate(mvm, rate);
1659 rs_fill_link_cmd(mvm, sta, lq_sta, ucode_rate);
9e680946 1660 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1661}
1662
977342bc
ES		 1663static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1664 struct ieee80211_hdr *hdr)
1665{
1666 u8 tid = IWL_MAX_TID_COUNT;
1667
1668 if (ieee80211_is_data_qos(hdr->frame_control)) {
1669 u8 *qc = ieee80211_get_qos_ctl(hdr);
1670 tid = qc[0] & 0xf;
1671 }
1672
1673 if (unlikely(tid > IWL_MAX_TID_COUNT))
1674 tid = IWL_MAX_TID_COUNT;
1675
1676 return tid;
1677}
1678
8ca151b5
JB		 1679/*
1680 * Do rate scaling and search for new modulation mode.
1681 */
1682static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1683 struct sk_buff *skb,
1684 struct ieee80211_sta *sta,
1685 struct iwl_lq_sta *lq_sta)
1686{
1687 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1688 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1689 int low = IWL_RATE_INVALID;
1690 int high = IWL_RATE_INVALID;
1691 int index;
1692 int i;
1693 struct iwl_rate_scale_data *window = NULL;
1694 int current_tpt = IWL_INVALID_VALUE;
1695 int low_tpt = IWL_INVALID_VALUE;
1696 int high_tpt = IWL_INVALID_VALUE;
1697 u32 fail_count;
1698 s8 scale_action = 0;
1699 u16 rate_mask;
1700 u8 update_lq = 0;
1701 struct iwl_scale_tbl_info *tbl, *tbl1;
1702 u16 rate_scale_index_msk = 0;
8ca151b5
JB		 1703 u8 active_tbl = 0;
1704 u8 done_search = 0;
1705 u16 high_low;
1706 s32 sr;
1707 u8 tid = IWL_MAX_TID_COUNT;
9d015a03 1708 u8 prev_agg = lq_sta->is_agg;
8ca151b5
JB		 1709 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1710 struct iwl_mvm_tid_data *tid_data;
5aa33553 1711 struct rs_rate *rate;
8ca151b5 1712
8ca151b5
JB		 1713 /* Send management frames and NO_ACK data using lowest rate. */
1714 /* TODO: this could probably be improved.. */
1715 if (!ieee80211_is_data(hdr->frame_control) ||
1716 info->flags & IEEE80211_TX_CTL_NO_ACK)
1717 return;
1718
1719 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1720
977342bc 1721 tid = rs_get_tid(lq_sta, hdr);
8ca151b5
JB		 1722 if ((tid != IWL_MAX_TID_COUNT) &&
1723 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1724 tid_data = &sta_priv->tid_data[tid];
1725 if (tid_data->state == IWL_AGG_OFF)
1726 lq_sta->is_agg = 0;
1727 else
1728 lq_sta->is_agg = 1;
1729 } else {
1730 lq_sta->is_agg = 0;
1731 }
1732
1733 /*
1734 * Select rate-scale / modulation-mode table to work with in
1735 * the rest of this function: "search" if searching for better
1736 * modulation mode, or "active" if doing rate scaling within a mode.
1737 */
1738 if (!lq_sta->search_better_tbl)
1739 active_tbl = lq_sta->active_tbl;
1740 else
1741 active_tbl = 1 - lq_sta->active_tbl;
1742
1743 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 1744 rate = &tbl->rate;
8ca151b5 1745
9d015a03
ES		 1746 if (prev_agg != lq_sta->is_agg) {
1747 IWL_DEBUG_RATE(mvm,
1748 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
1749 prev_agg, lq_sta->is_agg);
1750 rs_set_expected_tpt_table(lq_sta, tbl);
1751 }
1752
8ca151b5
JB		 1753 /* current tx rate */
1754 index = lq_sta->last_txrate_idx;
1755
8ca151b5 1756 /* rates available for this association, and for modulation mode */
a8ff14f5 1757 rate_mask = rs_get_supported_rates(lq_sta, rate);
8ca151b5 1758
8ca151b5 1759 /* mask with station rate restriction */
5aa33553 1760 if (is_legacy(rate)) {
8ca151b5
JB		 1761 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1762 /* supp_rates has no CCK bits in A mode */
1763 rate_scale_index_msk = (u16) (rate_mask &
1764 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1765 else
1766 rate_scale_index_msk = (u16) (rate_mask &
1767 lq_sta->supp_rates);
1768
1769 } else {
1770 rate_scale_index_msk = rate_mask;
1771 }
1772
1773 if (!rate_scale_index_msk)
1774 rate_scale_index_msk = rate_mask;
1775
1776 if (!((1 << index) & rate_scale_index_msk)) {
1777 IWL_ERR(mvm, "Current Rate is not valid\n");
1778 if (lq_sta->search_better_tbl) {
1779 /* revert to active table if search table is not valid*/
5aa33553 1780 rate->type = LQ_NONE;
8ca151b5
JB		 1781 lq_sta->search_better_tbl = 0;
1782 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1783 /* get "active" rate info */
1784 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
5aa33553
ES		 1785 tbl->rate.index = index;
1786 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
8ca151b5
JB		 1787 }
1788 return;
1789 }
1790
1791 /* Get expected throughput table and history window for current rate */
1792 if (!tbl->expected_tpt) {
1793 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1794 return;
1795 }
1796
1797 /* force user max rate if set by user */
1798 if ((lq_sta->max_rate_idx != -1) &&
1799 (lq_sta->max_rate_idx < index)) {
1800 index = lq_sta->max_rate_idx;
1801 update_lq = 1;
1802 window = &(tbl->win[index]);
4d30ee82
ES		 1803 IWL_DEBUG_RATE(mvm,
1804 "Forcing user max rate %d\n",
1805 index);
8ca151b5
JB		 1806 goto lq_update;
1807 }
1808
1809 window = &(tbl->win[index]);
1810
1811 /*
1812 * If there is not enough history to calculate actual average
1813 * throughput, keep analyzing results of more tx frames, without
1814 * changing rate or mode (bypass most of the rest of this function).
1815 * Set up new rate table in uCode only if old rate is not supported
1816 * in current association (use new rate found above).
1817 */
1818 fail_count = window->counter - window->success_counter;
1819 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1820 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1821 IWL_DEBUG_RATE(mvm,
4d30ee82 1822 "(%s: %d): Test Window: succ %d total %d\n",
5aa33553 1823 rs_pretty_lq_type(rate->type),
4d30ee82 1824 index, window->success_counter, window->counter);
8ca151b5
JB		 1825
1826 /* Can't calculate this yet; not enough history */
1827 window->average_tpt = IWL_INVALID_VALUE;
1828
1829 /* Should we stay with this modulation mode,
1830 * or search for a new one? */
1831 rs_stay_in_table(lq_sta, false);
1832
1833 goto out;
1834 }
1835 /* Else we have enough samples; calculate estimate of
1836 * actual average throughput */
1837 if (window->average_tpt != ((window->success_ratio *
1838 tbl->expected_tpt[index] + 64) / 128)) {
8ca151b5
JB		 1839 window->average_tpt = ((window->success_ratio *
1840 tbl->expected_tpt[index] + 64) / 128);
1841 }
1842
1843 /* If we are searching for better modulation mode, check success. */
1844 if (lq_sta->search_better_tbl) {
1845 /* If good success, continue using the "search" mode;
1846 * no need to send new link quality command, since we're
1847 * continuing to use the setup that we've been trying. */
1848 if (window->average_tpt > lq_sta->last_tpt) {
1849 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1850 "SWITCHING TO NEW TABLE SR: %d "
1851 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 1852 window->success_ratio,
1853 window->average_tpt,
1854 lq_sta->last_tpt);
1855
5aa33553 1856 if (!is_legacy(rate))
8ca151b5
JB		 1857 lq_sta->enable_counter = 1;
1858
1859 /* Swap tables; "search" becomes "active" */
1860 lq_sta->active_tbl = active_tbl;
1861 current_tpt = window->average_tpt;
1862 /* Else poor success; go back to mode in "active" table */
1863 } else {
1864 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1865 "GOING BACK TO THE OLD TABLE: SR %d "
1866 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 1867 window->success_ratio,
1868 window->average_tpt,
1869 lq_sta->last_tpt);
1870
1871 /* Nullify "search" table */
5aa33553 1872 rate->type = LQ_NONE;
8ca151b5
JB		 1873
1874 /* Revert to "active" table */
1875 active_tbl = lq_sta->active_tbl;
1876 tbl = &(lq_sta->lq_info[active_tbl]);
1877
1878 /* Revert to "active" rate and throughput info */
1879 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1880 current_tpt = lq_sta->last_tpt;
1881
1882 /* Need to set up a new rate table in uCode */
1883 update_lq = 1;
1884 }
1885
1886 /* Either way, we've made a decision; modulation mode
1887 * search is done, allow rate adjustment next time. */
1888 lq_sta->search_better_tbl = 0;
1889 done_search = 1; /* Don't switch modes below! */
1890 goto lq_update;
1891 }
1892
1893 /* (Else) not in search of better modulation mode, try for better
1894 * starting rate, while staying in this mode. */
1895 high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
5aa33553 1896 rate->type);
8ca151b5
JB		 1897 low = high_low & 0xff;
1898 high = (high_low >> 8) & 0xff;
1899
1900 /* If user set max rate, dont allow higher than user constrain */
1901 if ((lq_sta->max_rate_idx != -1) &&
1902 (lq_sta->max_rate_idx < high))
1903 high = IWL_RATE_INVALID;
1904
1905 sr = window->success_ratio;
1906
1907 /* Collect measured throughputs for current and adjacent rates */
1908 current_tpt = window->average_tpt;
1909 if (low != IWL_RATE_INVALID)
1910 low_tpt = tbl->win[low].average_tpt;
1911 if (high != IWL_RATE_INVALID)
1912 high_tpt = tbl->win[high].average_tpt;
1913
4d30ee82
ES		 1914 IWL_DEBUG_RATE(mvm,
1915 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
5aa33553
ES		 1916 rs_pretty_lq_type(rate->type), index, current_tpt, sr,
1917 low, high, low_tpt, high_tpt);
4d30ee82 1918
8ca151b5
JB		 1919 scale_action = 0;
1920
1921 /* Too many failures, decrease rate */
c48075d2 1922 if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
8ca151b5 1923 IWL_DEBUG_RATE(mvm,
4d30ee82 1924 "decrease rate because of low SR\n");
8ca151b5
JB		 1925 scale_action = -1;
1926 /* No throughput measured yet for adjacent rates; try increase. */
1927 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1928 (high_tpt == IWL_INVALID_VALUE)) {
4d30ee82
ES		 1929 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) {
1930 IWL_DEBUG_RATE(mvm,
1931 "Good SR and no high rate measurement. "
1932 "Increase rate\n");
8ca151b5 1933 scale_action = 1;
4d30ee82
ES		 1934 } else if (low != IWL_RATE_INVALID) {
1935 IWL_DEBUG_RATE(mvm,
1936 "Remain in current rate\n");
8ca151b5 1937 scale_action = 0;
4d30ee82 1938 }
8ca151b5
JB		 1939 }
1940
1941 /* Both adjacent throughputs are measured, but neither one has better
1942 * throughput; we're using the best rate, don't change it! */
1943 else if ((low_tpt != IWL_INVALID_VALUE) &&
1944 (high_tpt != IWL_INVALID_VALUE) &&
1945 (low_tpt < current_tpt) &&
4d30ee82
ES		 1946 (high_tpt < current_tpt)) {
1947 IWL_DEBUG_RATE(mvm,
1948 "Both high and low are worse. "
1949 "Maintain rate\n");
8ca151b5 1950 scale_action = 0;
4d30ee82 1951 }
8ca151b5
JB		 1952
1953 /* At least one adjacent rate's throughput is measured,
1954 * and may have better performance. */
1955 else {
1956 /* Higher adjacent rate's throughput is measured */
1957 if (high_tpt != IWL_INVALID_VALUE) {
1958 /* Higher rate has better throughput */
1959 if (high_tpt > current_tpt &&
1960 sr >= IWL_RATE_INCREASE_TH) {
4d30ee82
ES		 1961 IWL_DEBUG_RATE(mvm,
1962 "Higher rate is better and good "
1963 "SR. Increate rate\n");
8ca151b5
JB		 1964 scale_action = 1;
1965 } else {
4d30ee82
ES		 1966 IWL_DEBUG_RATE(mvm,
1967 "Higher rate isn't better OR "
1968 "no good SR. Maintain rate\n");
8ca151b5
JB		 1969 scale_action = 0;
1970 }
1971
1972 /* Lower adjacent rate's throughput is measured */
1973 } else if (low_tpt != IWL_INVALID_VALUE) {
1974 /* Lower rate has better throughput */
1975 if (low_tpt > current_tpt) {
1976 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1977 "Lower rate is better. "
1978 "Decrease rate\n");
8ca151b5
JB		 1979 scale_action = -1;
1980 } else if (sr >= IWL_RATE_INCREASE_TH) {
4d30ee82
ES		 1981 IWL_DEBUG_RATE(mvm,
1982 "Lower rate isn't better and "
1983 "good SR. Increase rate\n");
8ca151b5
JB		 1984 scale_action = 1;
1985 }
1986 }
1987 }
1988
1989 /* Sanity check; asked for decrease, but success rate or throughput
1990 * has been good at old rate. Don't change it. */
1991 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1992 ((sr > IWL_RATE_HIGH_TH) ||
4d30ee82
ES		 1993 (current_tpt > (100 * tbl->expected_tpt[low])))) {
1994 IWL_DEBUG_RATE(mvm,
1995 "Sanity check failed. Maintain rate\n");
8ca151b5 1996 scale_action = 0;
4d30ee82 1997 }
8ca151b5 1998
393b9e5b 1999 /* Force a search in case BT doesn't like us being in MIMO */
5aa33553 2000 if (is_mimo(rate) &&
393b9e5b 2001 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
4d30ee82
ES		 2002 IWL_DEBUG_RATE(mvm,
2003 "BT Coex forbids MIMO. Search for new config\n");
36946ce6
EG		 2004 rs_stay_in_table(lq_sta, true);
2005 goto lq_update;
2006 }
2007
8ca151b5
JB		 2008 switch (scale_action) {
2009 case -1:
2010 /* Decrease starting rate, update uCode's rate table */
2011 if (low != IWL_RATE_INVALID) {
2012 update_lq = 1;
2013 index = low;
4d30ee82
ES		 2014 } else {
2015 IWL_DEBUG_RATE(mvm,
2016 "At the bottom rate. Can't decrease\n");
8ca151b5
JB		 2017 }
2018
2019 break;
2020 case 1:
2021 /* Increase starting rate, update uCode's rate table */
2022 if (high != IWL_RATE_INVALID) {
2023 update_lq = 1;
2024 index = high;
4d30ee82
ES		 2025 } else {
2026 IWL_DEBUG_RATE(mvm,
2027 "At the top rate. Can't increase\n");
8ca151b5
JB		 2028 }
2029
2030 break;
2031 case 0:
2032 /* No change */
2033 default:
2034 break;
2035 }
2036
8ca151b5
JB		 2037lq_update:
2038 /* Replace uCode's rate table for the destination station. */
5aa33553
ES		 2039 if (update_lq) {
2040 tbl->rate.index = index;
2041 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2042 }
8ca151b5
JB		 2043
2044 rs_stay_in_table(lq_sta, false);
2045
2046 /*
2047 * Search for new modulation mode if we're:
2048 * 1) Not changing rates right now
2049 * 2) Not just finishing up a search
2050 * 3) Allowing a new search
2051 */
2052 if (!update_lq && !done_search &&
2053 !lq_sta->stay_in_tbl && window->counter) {
2054 /* Save current throughput to compare with "search" throughput*/
2055 lq_sta->last_tpt = current_tpt;
2056
4d30ee82
ES		 2057 IWL_DEBUG_RATE(mvm,
2058 "Start Search: update_lq %d done_search %d stay_in_tbl %d win->counter %d\n",
2059 update_lq, done_search, lq_sta->stay_in_tbl,
2060 window->counter);
8ca151b5
JB		 2061 /* Select a new "search" modulation mode to try.
2062 * If one is found, set up the new "search" table. */
5aa33553 2063 if (is_legacy(&tbl->rate))
8ca151b5 2064 rs_move_legacy_other(mvm, lq_sta, sta, index);
5aa33553 2065 else if (is_siso(&tbl->rate))
8ca151b5 2066 rs_move_siso_to_other(mvm, lq_sta, sta, index);
5aa33553 2067 else if (is_mimo2(&tbl->rate))
8ca151b5
JB		 2068 rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2069 else
d972ab31 2070 WARN_ON_ONCE(1);
8ca151b5
JB		 2071
2072 /* If new "search" mode was selected, set up in uCode table */
2073 if (lq_sta->search_better_tbl) {
2074 /* Access the "search" table, clear its history. */
2075 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2076 for (i = 0; i < IWL_RATE_COUNT; i++)
2077 rs_rate_scale_clear_window(&(tbl->win[i]));
2078
2079 /* Use new "search" start rate */
2080 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2081
2082 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2083 "Switch to SEARCH TABLE: "
2084 "mcs %X (%s: %d)\n",
2085 tbl->current_rate,
5aa33553 2086 rs_pretty_lq_type(tbl->rate.type),
4d30ee82 2087 index);
9145d151 2088 rs_fill_link_cmd(mvm, sta, lq_sta, tbl->current_rate);
9e680946 2089 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 2090 } else {
2091 done_search = 1;
2092 }
2093 }
2094
2095 if (done_search && !lq_sta->stay_in_tbl) {
2096 /* If the "active" (non-search) mode was legacy,
2097 * and we've tried switching antennas,
2098 * but we haven't been able to try HT modes (not available),
2099 * stay with best antenna legacy modulation for a while
2100 * before next round of mode comparisons. */
2101 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 2102 if (is_legacy(&tbl1->rate) && !sta->ht_cap.ht_supported &&
8ca151b5
JB		 2103 lq_sta->action_counter > tbl1->max_search) {
2104 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2105 rs_set_stay_in_table(mvm, 1, lq_sta);
2106 }
2107
2108 /* If we're in an HT mode, and all 3 mode switch actions
2109 * have been tried and compared, stay in this best modulation
2110 * mode for a while before next round of mode comparisons. */
2111 if (lq_sta->enable_counter &&
2112 (lq_sta->action_counter >= tbl1->max_search)) {
2113 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2114 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2115 (tid != IWL_MAX_TID_COUNT)) {
2116 tid_data = &sta_priv->tid_data[tid];
2117 if (tid_data->state == IWL_AGG_OFF) {
2118 IWL_DEBUG_RATE(mvm,
2119 "try to aggregate tid %d\n",
2120 tid);
2121 rs_tl_turn_on_agg(mvm, tid,
2122 lq_sta, sta);
2123 }
2124 }
2125 rs_set_stay_in_table(mvm, 0, lq_sta);
2126 }
2127 }
2128
2129out:
5aa33553
ES		 2130 tbl->rate.index = index;
2131 tbl->current_rate = ucode_rate_from_rs_rate(mvm, &tbl->rate);
8ca151b5
JB		 2132 lq_sta->last_txrate_idx = index;
2133}
2134
2135/**
2136 * rs_initialize_lq - Initialize a station's hardware rate table
2137 *
2138 * The uCode's station table contains a table of fallback rates
2139 * for automatic fallback during transmission.
2140 *
2141 * NOTE: This sets up a default set of values. These will be replaced later
2142 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2143 * rc80211_simple.
2144 *
2145 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2146 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2147 * which requires station table entry to exist).
2148 */
2149static void rs_initialize_lq(struct iwl_mvm *mvm,
2150 struct ieee80211_sta *sta,
2151 struct iwl_lq_sta *lq_sta,
b87c2179
ES		 2152 enum ieee80211_band band,
2153 bool init)
8ca151b5
JB		 2154{
2155 struct iwl_scale_tbl_info *tbl;
5aa33553 2156 struct rs_rate *rate;
8ca151b5 2157 int i;
5aa33553 2158 u32 ucode_rate;
8ca151b5
JB		 2159 u8 active_tbl = 0;
2160 u8 valid_tx_ant;
2161
2162 if (!sta || !lq_sta)
2163 return;
2164
2165 i = lq_sta->last_txrate_idx;
2166
ff402312 2167 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2168
2169 if (!lq_sta->search_better_tbl)
2170 active_tbl = lq_sta->active_tbl;
2171 else
2172 active_tbl = 1 - lq_sta->active_tbl;
2173
2174 tbl = &(lq_sta->lq_info[active_tbl]);
5aa33553 2175 rate = &tbl->rate;
8ca151b5
JB		 2176
2177 if ((i < 0) || (i >= IWL_RATE_COUNT))
2178 i = 0;
2179
5aa33553
ES		 2180 ucode_rate = iwl_rates[i].plcp;
2181 rate->ant = first_antenna(valid_tx_ant);
2182 ucode_rate |= rate->ant << RATE_MCS_ANT_POS;
8ca151b5
JB		 2183
2184 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
5aa33553 2185 ucode_rate |= RATE_MCS_CCK_MSK;
8ca151b5 2186
5aa33553
ES		 2187 rs_rate_from_ucode_rate(ucode_rate, band, rate);
2188 if (!rs_is_valid_ant(valid_tx_ant, rate->ant))
2189 rs_toggle_antenna(valid_tx_ant, &ucode_rate, rate);
8ca151b5 2190
5aa33553
ES		 2191 ucode_rate = ucode_rate_from_rs_rate(mvm, rate);
2192 tbl->current_rate = ucode_rate;
8ca151b5 2193 rs_set_expected_tpt_table(lq_sta, tbl);
5aa33553 2194 rs_fill_link_cmd(NULL, NULL, lq_sta, ucode_rate);
8ca151b5 2195 /* TODO restore station should remember the lq cmd */
b87c2179 2196 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
8ca151b5
JB		 2197}
2198
2199static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2200 struct ieee80211_tx_rate_control *txrc)
2201{
2202 struct sk_buff *skb = txrc->skb;
2203 struct ieee80211_supported_band *sband = txrc->sband;
2204 struct iwl_op_mode *op_mode __maybe_unused =
2205 (struct iwl_op_mode *)mvm_r;
2206 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2207 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2208 struct iwl_lq_sta *lq_sta = mvm_sta;
8ca151b5 2209
8ca151b5
JB		 2210 /* Get max rate if user set max rate */
2211 if (lq_sta) {
2212 lq_sta->max_rate_idx = txrc->max_rate_idx;
2213 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2214 (lq_sta->max_rate_idx != -1))
2215 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2216 if ((lq_sta->max_rate_idx < 0) ||
2217 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2218 lq_sta->max_rate_idx = -1;
2219 }
2220
2221 /* Treat uninitialized rate scaling data same as non-existing. */
2222 if (lq_sta && !lq_sta->drv) {
2223 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2224 mvm_sta = NULL;
2225 }
2226
2227 /* Send management frames and NO_ACK data using lowest rate. */
2228 if (rate_control_send_low(sta, mvm_sta, txrc))
2229 return;
2230
d310e405
ES		 2231 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2232 info->band, &info->control.rates[0]);
2233
622ebe99 2234 info->control.rates[0].count = 1;
8ca151b5
JB		 2235}
2236
2237static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2238 gfp_t gfp)
2239{
2240 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2241 struct iwl_op_mode *op_mode __maybe_unused =
2242 (struct iwl_op_mode *)mvm_rate;
2243 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2244
2245 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2246
2247 return &sta_priv->lq_sta;
2248}
2249
d310e405
ES		 2250static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2251 int nss)
2252{
2253 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2254 (0x3 << (2 * (nss - 1)));
2255 rx_mcs >>= (2 * (nss - 1));
2256
2257 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2258 return IWL_RATE_MCS_7_INDEX;
2259 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2260 return IWL_RATE_MCS_8_INDEX;
2261 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2262 return IWL_RATE_MCS_9_INDEX;
2263
2264 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2265 return -1;
2266}
2267
750a1b45
ES		 2268static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2269 struct ieee80211_sta_vht_cap *vht_cap,
2270 struct iwl_lq_sta *lq_sta)
2271{
2272 int i;
2273 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2274
2275 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2276 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2277 if (i == IWL_RATE_9M_INDEX)
2278 continue;
2279
271518ad
ES		 2280 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2281 if (i == IWL_RATE_MCS_9_INDEX &&
2282 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2283 continue;
2284
750a1b45
ES		 2285 lq_sta->active_siso_rate |= BIT(i);
2286 }
2287 }
2288
ecc90e79
ES		 2289 if (sta->rx_nss < 2)
2290 return;
2291
750a1b45
ES		 2292 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2293 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2294 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2295 if (i == IWL_RATE_9M_INDEX)
2296 continue;
2297
271518ad
ES		 2298 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2299 if (i == IWL_RATE_MCS_9_INDEX &&
2300 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2301 continue;
2302
750a1b45
ES		 2303 lq_sta->active_mimo2_rate |= BIT(i);
2304 }
2305 }
2306}
2307
8ca151b5
JB		 2308/*
2309 * Called after adding a new station to initialize rate scaling
2310 */
2311void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
b87c2179 2312 enum ieee80211_band band, bool init)
8ca151b5
JB		 2313{
2314 int i, j;
2315 struct ieee80211_hw *hw = mvm->hw;
2316 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
d310e405 2317 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
8ca151b5
JB		 2318 struct iwl_mvm_sta *sta_priv;
2319 struct iwl_lq_sta *lq_sta;
2320 struct ieee80211_supported_band *sband;
2321 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2322
2323 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2324 lq_sta = &sta_priv->lq_sta;
b87c2179
ES		 2325 memset(lq_sta, 0, sizeof(*lq_sta));
2326
8ca151b5
JB		 2327 sband = hw->wiphy->bands[band];
2328
2329 lq_sta->lq.sta_id = sta_priv->sta_id;
2330
2331 for (j = 0; j < LQ_SIZE; j++)
2332 for (i = 0; i < IWL_RATE_COUNT; i++)
2333 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2334
2335 lq_sta->flush_timer = 0;
2336 lq_sta->supp_rates = sta->supp_rates[sband->band];
8ca151b5
JB		 2337
2338 IWL_DEBUG_RATE(mvm,
2339 "LQ: *** rate scale station global init for station %d ***\n",
2340 sta_priv->sta_id);
2341 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2342 * the lowest or the highest rate.. Could consider using RSSI from
2343 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2344 * after assoc.. */
2345
2346 lq_sta->max_rate_idx = -1;
2347 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
8ca151b5
JB		 2348 lq_sta->band = sband->band;
2349 /*
2350 * active legacy rates as per supported rates bitmap
2351 */
2352 supp = sta->supp_rates[sband->band];
2353 lq_sta->active_legacy_rate = 0;
2354 for_each_set_bit(i, &supp, BITS_PER_LONG)
2355 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2356
d310e405
ES		 2357 /* TODO: should probably account for rx_highest for both HT/VHT */
2358 if (!vht_cap || !vht_cap->vht_supported) {
2359 /* active_siso_rate mask includes 9 MBits (bit 5),
2360 * and CCK (bits 0-3), supp_rates[] does not;
2361 * shift to convert format, force 9 MBits off.
2362 */
2363 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2364 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2365 lq_sta->active_siso_rate &= ~((u16)0x2);
2366 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2367
2368 /* Same here */
2369 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2370 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2371 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2372 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2373
2374 lq_sta->is_vht = false;
2375 } else {
750a1b45 2376 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
d310e405
ES		 2377 lq_sta->is_vht = true;
2378 }
8ca151b5 2379
8ca151b5 2380 IWL_DEBUG_RATE(mvm,
d310e405 2381 "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
8ca151b5 2382 lq_sta->active_siso_rate,
d310e405
ES		 2383 lq_sta->active_mimo2_rate,
2384 lq_sta->is_vht);
8ca151b5
JB		 2385
2386 /* These values will be overridden later */
2387 lq_sta->lq.single_stream_ant_msk =
ff402312 2388 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
809bccfa 2389 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
8ca151b5
JB		 2390
2391 /* as default allow aggregation for all tids */
2392 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2393 lq_sta->drv = mvm;
2394
2395 /* Set last_txrate_idx to lowest rate */
2396 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2397 if (sband->band == IEEE80211_BAND_5GHZ)
2398 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2399 lq_sta->is_agg = 0;
2400#ifdef CONFIG_MAC80211_DEBUGFS
2401 lq_sta->dbg_fixed_rate = 0;
2402#endif
2403
b87c2179
ES		 2404 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2405}
2406
2407static void rs_rate_update(void *mvm_r,
2408 struct ieee80211_supported_band *sband,
2409 struct cfg80211_chan_def *chandef,
2410 struct ieee80211_sta *sta, void *priv_sta,
2411 u32 changed)
2412{
2413 u8 tid;
2414 struct iwl_op_mode *op_mode =
2415 (struct iwl_op_mode *)mvm_r;
2416 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2417
2418 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2419 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2420 ieee80211_stop_tx_ba_session(sta, tid);
2421
2422 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
8ca151b5
JB		 2423}
2424
2425static void rs_fill_link_cmd(struct iwl_mvm *mvm,
9145d151 2426 struct ieee80211_sta *sta,
8ca151b5
JB		 2427 struct iwl_lq_sta *lq_sta, u32 new_rate)
2428{
5aa33553 2429 struct rs_rate rate;
8ca151b5 2430 int index = 0;
8ca151b5
JB		 2431 int repeat_rate = 0;
2432 u8 ant_toggle_cnt = 0;
2433 u8 use_ht_possible = 1;
2434 u8 valid_tx_ant = 0;
2435 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2436
2437 /* Override starting rate (index 0) if needed for debug purposes */
3571ac33 2438 rs_dbgfs_set_mcs(lq_sta, &new_rate);
8ca151b5 2439
5aa33553 2440 rs_rate_from_ucode_rate(new_rate, lq_sta->band, &rate);
8ca151b5
JB		 2441
2442 /* How many times should we repeat the initial rate? */
5aa33553 2443 if (is_legacy(&rate)) {
8ca151b5
JB		 2444 ant_toggle_cnt = 1;
2445 repeat_rate = IWL_NUMBER_TRY;
2446 } else {
2447 repeat_rate = min(IWL_HT_NUMBER_TRY,
2448 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2449 }
2450
5aa33553 2451 lq_cmd->mimo_delim = is_mimo(&rate) ? 1 : 0;
8ca151b5
JB		 2452
2453 /* Fill 1st table entry (index 0) */
2454 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2455
5aa33553
ES		 2456 if (num_of_ant(rate.ant) == 1)
2457 lq_cmd->single_stream_ant_msk = rate.ant;
8ca151b5
JB		 2458 /* otherwise we don't modify the existing value */
2459
2460 index++;
2461 repeat_rate--;
2462 if (mvm)
ff402312 2463 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2464
2465 /* Fill rest of rate table */
2466 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2467 /* Repeat initial/next rate.
2468 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2469 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2470 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
5aa33553 2471 if (is_legacy(&rate)) {
8ca151b5
JB		 2472 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2473 ant_toggle_cnt++;
2474 else if (mvm &&
2475 rs_toggle_antenna(valid_tx_ant,
5aa33553 2476 &new_rate, &rate))
8ca151b5
JB		 2477 ant_toggle_cnt = 1;
2478 }
2479
2480 /* Override next rate if needed for debug purposes */
3571ac33 2481 rs_dbgfs_set_mcs(lq_sta, &new_rate);
8ca151b5
JB		 2482
2483 /* Fill next table entry */
2484 lq_cmd->rs_table[index] =
2485 cpu_to_le32(new_rate);
2486 repeat_rate--;
2487 index++;
2488 }
2489
5aa33553 2490 rs_rate_from_ucode_rate(new_rate, lq_sta->band, &rate);
8ca151b5 2491
8ca151b5
JB		 2492 /* Indicate to uCode which entries might be MIMO.
2493 * If initial rate was MIMO, this will finally end up
2494 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
5aa33553 2495 if (is_mimo(&rate))
8ca151b5
JB		 2496 lq_cmd->mimo_delim = index;
2497
2498 /* Get next rate */
5aa33553 2499 new_rate = rs_get_lower_rate(lq_sta, &rate, rate.index,
8ca151b5
JB		 2500 use_ht_possible);
2501
2502 /* How many times should we repeat the next rate? */
5aa33553 2503 if (is_legacy(&rate)) {
8ca151b5
JB		 2504 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2505 ant_toggle_cnt++;
2506 else if (mvm &&
2507 rs_toggle_antenna(valid_tx_ant,
5aa33553 2508 &new_rate, &rate))
8ca151b5
JB		 2509 ant_toggle_cnt = 1;
2510
2511 repeat_rate = IWL_NUMBER_TRY;
2512 } else {
2513 repeat_rate = IWL_HT_NUMBER_TRY;
2514 }
2515
2516 /* Don't allow HT rates after next pass.
d310e405
ES		 2517 * rs_get_lower_rate() will change type to LQ_LEGACY_A
2518 * or LQ_LEGACY_G.
2519 */
8ca151b5
JB		 2520 use_ht_possible = 0;
2521
2522 /* Override next rate if needed for debug purposes */
3571ac33 2523 rs_dbgfs_set_mcs(lq_sta, &new_rate);
8ca151b5
JB		 2524
2525 /* Fill next table entry */
2526 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2527
2528 index++;
2529 repeat_rate--;
2530 }
2531
2532 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2533 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2534
2535 lq_cmd->agg_time_limit =
2536 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
e96d551f 2537
9145d151
EG		 2538 if (sta)
2539 lq_cmd->agg_time_limit =
2540 cpu_to_le16(iwl_mvm_bt_coex_agg_time_limit(mvm, sta));
8ca151b5
JB		 2541}
2542
2543static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2544{
2545 return hw->priv;
2546}
2547/* rate scale requires free function to be implemented */
2548static void rs_free(void *mvm_rate)
2549{
2550 return;
2551}
2552
2553static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2554 void *mvm_sta)
2555{
2556 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2557 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2558
2559 IWL_DEBUG_RATE(mvm, "enter\n");
2560 IWL_DEBUG_RATE(mvm, "leave\n");
2561}
2562
2563#ifdef CONFIG_MAC80211_DEBUGFS
2564static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3571ac33 2565 u32 *rate_n_flags)
8ca151b5
JB		 2566{
2567 struct iwl_mvm *mvm;
2568 u8 valid_tx_ant;
2569 u8 ant_sel_tx;
2570
2571 mvm = lq_sta->drv;
ff402312 2572 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2573 if (lq_sta->dbg_fixed_rate) {
2574 ant_sel_tx =
2575 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2576 >> RATE_MCS_ANT_POS);
2577 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2578 *rate_n_flags = lq_sta->dbg_fixed_rate;
8ca151b5
JB		 2579 } else {
2580 lq_sta->dbg_fixed_rate = 0;
2581 IWL_ERR(mvm,
2582 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2583 ant_sel_tx, valid_tx_ant);
2584 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2585 }
8ca151b5
JB		 2586 }
2587}
2588
2589static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2590 const char __user *user_buf, size_t count, loff_t *ppos)
2591{
2592 struct iwl_lq_sta *lq_sta = file->private_data;
2593 struct iwl_mvm *mvm;
2594 char buf[64];
2595 size_t buf_size;
2596 u32 parsed_rate;
2597
2598
2599 mvm = lq_sta->drv;
2600 memset(buf, 0, sizeof(buf));
2601 buf_size = min(count, sizeof(buf) - 1);
2602 if (copy_from_user(buf, user_buf, buf_size))
2603 return -EFAULT;
2604
2605 if (sscanf(buf, "%x", &parsed_rate) == 1)
2606 lq_sta->dbg_fixed_rate = parsed_rate;
2607 else
2608 lq_sta->dbg_fixed_rate = 0;
2609
2610 rs_program_fix_rate(mvm, lq_sta);
2611
2612 return count;
2613}
2614
4d30ee82
ES		 2615static const char *rs_pretty_lq_type(enum iwl_table_type type)
2616{
5aa33553 2617 static const char * const lq_types[] = {
4d30ee82
ES		 2618 [LQ_NONE] = "NONE",
2619 [LQ_LEGACY_A] = "LEGACY_A",
2620 [LQ_LEGACY_G] = "LEGACY_G",
2621 [LQ_HT_SISO] = "HT SISO",
2622 [LQ_HT_MIMO2] = "HT MIMO",
2623 [LQ_VHT_SISO] = "VHT SISO",
2624 [LQ_VHT_MIMO2] = "VHT MIMO",
2625 };
2626
2627 if (type < LQ_NONE || type >= LQ_MAX)
2628 return "UNKNOWN";
2629
5aa33553 2630 return lq_types[type];
4d30ee82
ES		 2631}
2632
5aa33553 2633static const char *rs_pretty_ant(u8 ant)
1a61b347
ES		 2634{
2635 static const char * const ant_name[] = {
2636 [ANT_NONE] = "None",
2637 [ANT_A] = "A",
2638 [ANT_B] = "B",
2639 [ANT_AB] = "AB",
2640 [ANT_C] = "C",
2641 [ANT_AC] = "AC",
2642 [ANT_BC] = "BC",
2643 [ANT_ABC] = "ABC",
2644 };
2645
5aa33553
ES		 2646 if (ant > ANT_ABC)
2647 return "UNKNOWN";
2648
2649 return ant_name[ant];
2650}
2651
2652static int rs_pretty_print_rate(char *buf, const u32 rate)
2653{
2654
1a61b347
ES		 2655 char *type, *bw;
2656 u8 mcs = 0, nss = 0;
2657 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2658
2659 if (!(rate & RATE_MCS_HT_MSK) &&
2660 !(rate & RATE_MCS_VHT_MSK)) {
2661 int index = iwl_hwrate_to_plcp_idx(rate);
2662
2663 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
5aa33553 2664 rs_pretty_ant(ant), iwl_rate_mcs[index].mbps);
1a61b347
ES		 2665 }
2666
2667 if (rate & RATE_MCS_VHT_MSK) {
2668 type = "VHT";
2669 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2670 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2671 >> RATE_VHT_MCS_NSS_POS) + 1;
2672 } else if (rate & RATE_MCS_HT_MSK) {
2673 type = "HT";
2674 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2675 } else {
2676 type = "Unknown"; /* shouldn't happen */
2677 }
2678
2679 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2680 case RATE_MCS_CHAN_WIDTH_20:
2681 bw = "20Mhz";
2682 break;
2683 case RATE_MCS_CHAN_WIDTH_40:
2684 bw = "40Mhz";
2685 break;
2686 case RATE_MCS_CHAN_WIDTH_80:
2687 bw = "80Mhz";
2688 break;
2689 case RATE_MCS_CHAN_WIDTH_160:
2690 bw = "160Mhz";
2691 break;
2692 default:
2693 bw = "BAD BW";
2694 }
2695
2696 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
5aa33553 2697 type, rs_pretty_ant(ant), bw, mcs, nss,
1a61b347
ES		 2698 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2699 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
2700 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2701 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2702 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2703}
2704
8ca151b5
JB		 2705static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2706 char __user *user_buf, size_t count, loff_t *ppos)
2707{
2708 char *buff;
2709 int desc = 0;
2710 int i = 0;
8ca151b5
JB		 2711 ssize_t ret;
2712
2713 struct iwl_lq_sta *lq_sta = file->private_data;
2714 struct iwl_mvm *mvm;
2715 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
5aa33553 2716 struct rs_rate *rate = &tbl->rate;
8ca151b5 2717 mvm = lq_sta->drv;
1a61b347 2718 buff = kmalloc(2048, GFP_KERNEL);
8ca151b5
JB		 2719 if (!buff)
2720 return -ENOMEM;
2721
2722 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2723 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2724 lq_sta->total_failed, lq_sta->total_success,
2725 lq_sta->active_legacy_rate);
2726 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2727 lq_sta->dbg_fixed_rate);
2728 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
ff402312
EG		 2729 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2730 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2731 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
8ca151b5 2732 desc += sprintf(buff+desc, "lq type %s\n",
5aa33553
ES		 2733 (is_legacy(rate)) ? "legacy" :
2734 is_vht(rate) ? "VHT" : "HT");
2735 if (!is_legacy(rate)) {
8ca151b5 2736 desc += sprintf(buff+desc, " %s",
5aa33553 2737 (is_siso(rate)) ? "SISO" : "MIMO2");
8ca151b5 2738 desc += sprintf(buff+desc, " %s",
5aa33553
ES		 2739 (is_ht20(rate)) ? "20MHz" :
2740 (is_ht40(rate)) ? "40MHz" :
2741 (is_ht80(rate)) ? "80Mhz" : "BAD BW");
6a524f48 2742 desc += sprintf(buff+desc, " %s %s\n",
5aa33553 2743 (rate->sgi) ? "SGI" : "NGI",
6a524f48 2744 (lq_sta->is_agg) ? "AGG on" : "");
8ca151b5
JB		 2745 }
2746 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2747 lq_sta->last_rate_n_flags);
2748 desc += sprintf(buff+desc,
1a61b347 2749 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
8ca151b5
JB		 2750 lq_sta->lq.flags,
2751 lq_sta->lq.mimo_delim,
2752 lq_sta->lq.single_stream_ant_msk,
2753 lq_sta->lq.dual_stream_ant_msk);
2754
2755 desc += sprintf(buff+desc,
2756 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2757 le16_to_cpu(lq_sta->lq.agg_time_limit),
2758 lq_sta->lq.agg_disable_start_th,
2759 lq_sta->lq.agg_frame_cnt_limit);
2760
2761 desc += sprintf(buff+desc,
2762 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2763 lq_sta->lq.initial_rate_index[0],
2764 lq_sta->lq.initial_rate_index[1],
2765 lq_sta->lq.initial_rate_index[2],
2766 lq_sta->lq.initial_rate_index[3]);
2767
2768 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
1a61b347
ES		 2769 u32 rate = le32_to_cpu(lq_sta->lq.rs_table[i]);
2770 desc += sprintf(buff+desc,
2771 " rate[%d] 0x%X ",
2772 i, rate);
2773
2774 desc += rs_pretty_print_rate(buff+desc, rate);
8ca151b5
JB		 2775 }
2776
2777 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2778 kfree(buff);
2779 return ret;
2780}
2781
2782static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2783 .write = rs_sta_dbgfs_scale_table_write,
2784 .read = rs_sta_dbgfs_scale_table_read,
2785 .open = simple_open,
2786 .llseek = default_llseek,
2787};
2788static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2789 char __user *user_buf, size_t count, loff_t *ppos)
2790{
2791 char *buff;
2792 int desc = 0;
2793 int i, j;
2794 ssize_t ret;
d310e405 2795 struct iwl_scale_tbl_info *tbl;
5aa33553 2796 struct rs_rate *rate;
8ca151b5
JB		 2797 struct iwl_lq_sta *lq_sta = file->private_data;
2798
2799 buff = kmalloc(1024, GFP_KERNEL);
2800 if (!buff)
2801 return -ENOMEM;
2802
2803 for (i = 0; i < LQ_SIZE; i++) {
d310e405 2804 tbl = &(lq_sta->lq_info[i]);
5aa33553 2805 rate = &tbl->rate;
8ca151b5 2806 desc += sprintf(buff+desc,
6a524f48 2807 "%s type=%d SGI=%d BW=%s DUP=0\n"
8ca151b5
JB		 2808 "rate=0x%X\n",
2809 lq_sta->active_tbl == i ? "*" : "x",
5aa33553
ES		 2810 rate->type,
2811 rate->sgi,
2812 is_ht20(rate) ? "20Mhz" :
2813 is_ht40(rate) ? "40Mhz" :
2814 is_ht80(rate) ? "80Mhz" : "ERR",
d310e405 2815 tbl->current_rate);
8ca151b5
JB		 2816 for (j = 0; j < IWL_RATE_COUNT; j++) {
2817 desc += sprintf(buff+desc,
2818 "counter=%d success=%d %%=%d\n",
d310e405
ES		 2819 tbl->win[j].counter,
2820 tbl->win[j].success_counter,
2821 tbl->win[j].success_ratio);
8ca151b5
JB		 2822 }
2823 }
2824 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2825 kfree(buff);
2826 return ret;
2827}
2828
2829static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2830 .read = rs_sta_dbgfs_stats_table_read,
2831 .open = simple_open,
2832 .llseek = default_llseek,
2833};
2834
8ca151b5
JB		 2835static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2836{
2837 struct iwl_lq_sta *lq_sta = mvm_sta;
2838 lq_sta->rs_sta_dbgfs_scale_table_file =
2839 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2840 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2841 lq_sta->rs_sta_dbgfs_stats_table_file =
2842 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2843 lq_sta, &rs_sta_dbgfs_stats_table_ops);
8ca151b5
JB		 2844 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2845 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2846 &lq_sta->tx_agg_tid_en);
2847}
2848
2849static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2850{
2851 struct iwl_lq_sta *lq_sta = mvm_sta;
2852 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2853 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
8ca151b5
JB		 2854 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2855}
2856#endif
2857
2858/*
2859 * Initialization of rate scaling information is done by driver after
2860 * the station is added. Since mac80211 calls this function before a
2861 * station is added we ignore it.
2862 */
2863static void rs_rate_init_stub(void *mvm_r,
3de805cf
SW		 2864 struct ieee80211_supported_band *sband,
2865 struct cfg80211_chan_def *chandef,
2866 struct ieee80211_sta *sta, void *mvm_sta)
8ca151b5
JB		 2867{
2868}
2869static struct rate_control_ops rs_mvm_ops = {
2870 .module = NULL,
2871 .name = RS_NAME,
2872 .tx_status = rs_tx_status,
2873 .get_rate = rs_get_rate,
2874 .rate_init = rs_rate_init_stub,
2875 .alloc = rs_alloc,
2876 .free = rs_free,
2877 .alloc_sta = rs_alloc_sta,
2878 .free_sta = rs_free_sta,
b87c2179 2879 .rate_update = rs_rate_update,
8ca151b5
JB		 2880#ifdef CONFIG_MAC80211_DEBUGFS
2881 .add_sta_debugfs = rs_add_debugfs,
2882 .remove_sta_debugfs = rs_remove_debugfs,
2883#endif
2884};
2885
2886int iwl_mvm_rate_control_register(void)
2887{
2888 return ieee80211_rate_control_register(&rs_mvm_ops);
2889}
2890
2891void iwl_mvm_rate_control_unregister(void)
2892{
2893 ieee80211_rate_control_unregister(&rs_mvm_ops);
2894}
9ee718aa
EL		 2895
2896/**
2897 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2898 * Tx protection, according to this rquest and previous requests,
2899 * and send the LQ command.
9ee718aa
EL		 2900 * @mvmsta: The station
2901 * @enable: Enable Tx protection?
2902 */
e126b5d9
JB		 2903int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2904 bool enable)
9ee718aa 2905{
e126b5d9
JB		 2906 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2907
9ee718aa
EL		 2908 lockdep_assert_held(&mvm->mutex);
2909
2910 if (enable) {
2911 if (mvmsta->tx_protection == 0)
d307ec8d 2912 lq->flags |= LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 2913 mvmsta->tx_protection++;
2914 } else {
2915 mvmsta->tx_protection--;
2916 if (mvmsta->tx_protection == 0)
d307ec8d 2917 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 2918 }
2919
9e680946 2920 return iwl_mvm_send_lq_cmd(mvm, lq, false);
9ee718aa 2921}
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