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iwlwifi: mvm: rs: reduce min failures to end test window
[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
55/* max time to accum history 2 seconds */
56#define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
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);
8ca151b5
JB		 178
179#ifdef CONFIG_MAC80211_DEBUGFS
180static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3571ac33 181 u32 *rate_n_flags);
8ca151b5
JB		 182#else
183static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3571ac33 184 u32 *rate_n_flags)
8ca151b5
JB		 185{}
186#endif
187
188/**
189 * The following tables contain the expected throughput metrics for all rates
190 *
191 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
192 *
193 * where invalid entries are zeros.
194 *
195 * CCK rates are only valid in legacy table and will only be used in G
196 * (2.4 GHz) band.
197 */
198
199static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
4e82dd3a 200 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
8ca151b5
JB		 201};
202
4e82dd3a
ES		 203/* Expected TpT tables. 4 indexes:
204 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
205 */
206static s32 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
207 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0},
208 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0},
209 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0},
210 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
8ca151b5
JB		 211};
212
4e82dd3a
ES		 213static s32 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
214 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275},
215 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280},
216 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173},
217 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
8ca151b5
JB		 218};
219
d310e405
ES		 220static s32 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
221 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308},
222 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312},
223 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
224 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
225};
226
8ca151b5 227static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 228 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0},
229 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0},
230 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
231 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
8ca151b5
JB		 232};
233
234static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
4e82dd3a
ES		 235 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300},
236 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303},
237 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
238 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
8ca151b5
JB		 239};
240
d310e405
ES		 241static s32 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
242 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319},
243 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320},
244 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
245 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
246};
247
8ca151b5
JB		 248/* mbps, mcs */
249static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
250 { "1", "BPSK DSSS"},
251 { "2", "QPSK DSSS"},
252 {"5.5", "BPSK CCK"},
253 { "11", "QPSK CCK"},
254 { "6", "BPSK 1/2"},
255 { "9", "BPSK 1/2"},
256 { "12", "QPSK 1/2"},
257 { "18", "QPSK 3/4"},
258 { "24", "16QAM 1/2"},
259 { "36", "16QAM 3/4"},
260 { "48", "64QAM 2/3"},
261 { "54", "64QAM 3/4"},
262 { "60", "64QAM 5/6"},
263};
264
265#define MCS_INDEX_PER_STREAM (8)
266
267static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
268{
269 window->data = 0;
270 window->success_counter = 0;
271 window->success_ratio = IWL_INVALID_VALUE;
272 window->counter = 0;
273 window->average_tpt = IWL_INVALID_VALUE;
274 window->stamp = 0;
275}
276
277static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
278{
279 return (ant_type & valid_antenna) == ant_type;
280}
281
8ca151b5
JB		 282#ifdef CONFIG_MAC80211_DEBUGFS
283/**
284 * Program the device to use fixed rate for frame transmit
285 * This is for debugging/testing only
286 * once the device start use fixed rate, we need to reload the module
287 * to being back the normal operation.
288 */
289static void rs_program_fix_rate(struct iwl_mvm *mvm,
290 struct iwl_lq_sta *lq_sta)
291{
292 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
293 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
294 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
8ca151b5
JB		 295
296 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
297 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
298
299 if (lq_sta->dbg_fixed_rate) {
9145d151 300 rs_fill_link_cmd(NULL, NULL, lq_sta, lq_sta->dbg_fixed_rate);
9e680946 301 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
8ca151b5
JB		 302 }
303}
304#endif
305
8ca151b5
JB		 306static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
307 struct iwl_lq_sta *lq_data, u8 tid,
308 struct ieee80211_sta *sta)
309{
310 int ret = -EAGAIN;
8ca151b5 311
44cc429c
EG		 312 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
313 sta->addr, tid);
314 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
315 if (ret == -EAGAIN) {
316 /*
317 * driver and mac80211 is out of sync
318 * this might be cause by reloading firmware
319 * stop the tx ba session here
320 */
321 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
322 tid);
323 ieee80211_stop_tx_ba_session(sta, tid);
8ca151b5
JB		 324 }
325 return ret;
326}
327
328static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
329 struct iwl_lq_sta *lq_data,
330 struct ieee80211_sta *sta)
331{
332 if (tid < IWL_MAX_TID_COUNT)
333 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
334 else
335 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
336 tid, IWL_MAX_TID_COUNT);
337}
338
339static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
340{
341 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
342 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
343 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
344}
345
346/*
347 * Static function to get the expected throughput from an iwl_scale_tbl_info
348 * that wraps a NULL pointer check
349 */
350static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
351{
352 if (tbl->expected_tpt)
353 return tbl->expected_tpt[rs_index];
354 return 0;
355}
356
357/**
358 * rs_collect_tx_data - Update the success/failure sliding window
359 *
360 * We keep a sliding window of the last 62 packets transmitted
361 * at this rate. window->data contains the bitmask of successful
362 * packets.
363 */
364static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
365 int scale_index, int attempts, int successes)
366{
367 struct iwl_rate_scale_data *window = NULL;
368 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
369 s32 fail_count, tpt;
370
371 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
372 return -EINVAL;
373
374 /* Select window for current tx bit rate */
375 window = &(tbl->win[scale_index]);
376
377 /* Get expected throughput */
378 tpt = get_expected_tpt(tbl, scale_index);
379
380 /*
381 * Keep track of only the latest 62 tx frame attempts in this rate's
382 * history window; anything older isn't really relevant any more.
383 * If we have filled up the sliding window, drop the oldest attempt;
384 * if the oldest attempt (highest bit in bitmap) shows "success",
385 * subtract "1" from the success counter (this is the main reason
386 * we keep these bitmaps!).
387 */
388 while (attempts > 0) {
389 if (window->counter >= IWL_RATE_MAX_WINDOW) {
390 /* remove earliest */
391 window->counter = IWL_RATE_MAX_WINDOW - 1;
392
393 if (window->data & mask) {
394 window->data &= ~mask;
395 window->success_counter--;
396 }
397 }
398
399 /* Increment frames-attempted counter */
400 window->counter++;
401
402 /* Shift bitmap by one frame to throw away oldest history */
403 window->data <<= 1;
404
405 /* Mark the most recent #successes attempts as successful */
406 if (successes > 0) {
407 window->success_counter++;
408 window->data |= 0x1;
409 successes--;
410 }
411
412 attempts--;
413 }
414
415 /* Calculate current success ratio, avoid divide-by-0! */
416 if (window->counter > 0)
417 window->success_ratio = 128 * (100 * window->success_counter)
418 / window->counter;
419 else
420 window->success_ratio = IWL_INVALID_VALUE;
421
422 fail_count = window->counter - window->success_counter;
423
424 /* Calculate average throughput, if we have enough history. */
425 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
426 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
427 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
428 else
429 window->average_tpt = IWL_INVALID_VALUE;
430
431 /* Tag this window as having been updated */
432 window->stamp = jiffies;
433
434 return 0;
435}
436
437/*
438 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
439 */
440/* FIXME:RS:remove this function and put the flags statically in the table */
441static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm,
6a524f48 442 struct iwl_scale_tbl_info *tbl, int index)
8ca151b5
JB		 443{
444 u32 rate_n_flags = 0;
445
d310e405
ES		 446 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
447 RATE_MCS_ANT_ABC_MSK);
448
8ca151b5 449 if (is_legacy(tbl->lq_type)) {
d310e405 450 rate_n_flags |= iwl_rates[index].plcp;
8ca151b5
JB		 451 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
452 rate_n_flags |= RATE_MCS_CCK_MSK;
d310e405
ES		 453 return rate_n_flags;
454 }
455
456 if (is_ht(tbl->lq_type)) {
457 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
8ca151b5 458 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
4e82dd3a 459 index = IWL_LAST_HT_RATE;
8ca151b5 460 }
d310e405 461 rate_n_flags |= RATE_MCS_HT_MSK;
8ca151b5 462
d310e405
ES		 463 if (is_ht_siso(tbl->lq_type))
464 rate_n_flags |= iwl_rates[index].plcp_ht_siso;
465 else if (is_ht_mimo2(tbl->lq_type))
466 rate_n_flags |= iwl_rates[index].plcp_ht_mimo2;
8ca151b5 467 else
d972ab31 468 WARN_ON_ONCE(1);
d310e405
ES		 469 } else if (is_vht(tbl->lq_type)) {
470 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
471 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
472 index = IWL_LAST_VHT_RATE;
473 }
474 rate_n_flags |= RATE_MCS_VHT_MSK;
475 if (is_vht_siso(tbl->lq_type))
476 rate_n_flags |= iwl_rates[index].plcp_vht_siso;
477 else if (is_vht_mimo2(tbl->lq_type))
478 rate_n_flags |= iwl_rates[index].plcp_vht_mimo2;
479 else
480 WARN_ON_ONCE(1);
481
8ca151b5
JB		 482 } else {
483 IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type);
484 }
485
d310e405
ES		 486 rate_n_flags |= tbl->bw;
487 if (tbl->is_SGI)
488 rate_n_flags |= RATE_MCS_SGI_MSK;
489
8ca151b5
JB		 490 return rate_n_flags;
491}
492
493/*
494 * Interpret uCode API's rate_n_flags format,
495 * fill "search" or "active" tx mode table.
496 */
497static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
498 enum ieee80211_band band,
499 struct iwl_scale_tbl_info *tbl,
500 int *rate_idx)
501{
502 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
503 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
d310e405 504 u8 nss;
8ca151b5 505
faec6f91 506 memset(tbl, 0, offsetof(struct iwl_scale_tbl_info, win));
8ca151b5
JB		 507 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
508
509 if (*rate_idx == IWL_RATE_INVALID) {
510 *rate_idx = -1;
511 return -EINVAL;
512 }
513 tbl->is_SGI = 0; /* default legacy setup */
d310e405 514 tbl->bw = 0;
8ca151b5
JB		 515 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
516 tbl->lq_type = LQ_NONE;
517 tbl->max_search = IWL_MAX_SEARCH;
518
d310e405
ES		 519 /* Legacy */
520 if (!(rate_n_flags & RATE_MCS_HT_MSK) &&
521 !(rate_n_flags & RATE_MCS_VHT_MSK)) {
8ca151b5
JB		 522 if (num_of_ant == 1) {
523 if (band == IEEE80211_BAND_5GHZ)
d310e405 524 tbl->lq_type = LQ_LEGACY_A;
8ca151b5 525 else
d310e405 526 tbl->lq_type = LQ_LEGACY_G;
8ca151b5 527 }
d310e405
ES		 528
529 return 0;
530 }
531
532 /* HT or VHT */
533 if (rate_n_flags & RATE_MCS_SGI_MSK)
534 tbl->is_SGI = 1;
535
536 tbl->bw = rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK;
537
538 if (rate_n_flags & RATE_MCS_HT_MSK) {
539 nss = ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
540 RATE_HT_MCS_NSS_POS) + 1;
541
542 if (nss == 1) {
543 tbl->lq_type = LQ_HT_SISO;
544 WARN_ON_ONCE(num_of_ant != 1);
545 } else if (nss == 2) {
546 tbl->lq_type = LQ_HT_MIMO2;
547 WARN_ON_ONCE(num_of_ant != 2);
8ca151b5 548 } else {
d310e405
ES		 549 WARN_ON_ONCE(1);
550 }
551 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
552 nss = ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
553 RATE_VHT_MCS_NSS_POS) + 1;
554
555 if (nss == 1) {
556 tbl->lq_type = LQ_VHT_SISO;
557 WARN_ON_ONCE(num_of_ant != 1);
558 } else if (nss == 2) {
559 tbl->lq_type = LQ_VHT_MIMO2;
560 WARN_ON_ONCE(num_of_ant != 2);
561 } else {
562 WARN_ON_ONCE(1);
8ca151b5
JB		 563 }
564 }
d310e405
ES		 565
566 WARN_ON_ONCE(tbl->bw == RATE_MCS_CHAN_WIDTH_160);
567 WARN_ON_ONCE(tbl->bw == RATE_MCS_CHAN_WIDTH_80 &&
568 !is_vht(tbl->lq_type));
569
8ca151b5
JB		 570 return 0;
571}
572
573/* switch to another antenna/antennas and return 1 */
574/* if no other valid antenna found, return 0 */
575static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
576 struct iwl_scale_tbl_info *tbl)
577{
578 u8 new_ant_type;
579
580 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
581 return 0;
582
583 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
584 return 0;
585
586 new_ant_type = ant_toggle_lookup[tbl->ant_type];
587
588 while ((new_ant_type != tbl->ant_type) &&
589 !rs_is_valid_ant(valid_ant, new_ant_type))
590 new_ant_type = ant_toggle_lookup[new_ant_type];
591
592 if (new_ant_type == tbl->ant_type)
593 return 0;
594
595 tbl->ant_type = new_ant_type;
596 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
597 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
598 return 1;
599}
600
8ca151b5
JB		 601/**
602 * rs_get_supported_rates - get the available rates
603 *
604 * if management frame or broadcast frame only return
605 * basic available rates.
606 *
607 */
608static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
609 struct ieee80211_hdr *hdr,
610 enum iwl_table_type rate_type)
611{
d310e405 612 if (is_legacy(rate_type))
8ca151b5 613 return lq_sta->active_legacy_rate;
d310e405
ES		 614 else if (is_siso(rate_type))
615 return lq_sta->active_siso_rate;
616 else if (is_mimo2(rate_type))
617 return lq_sta->active_mimo2_rate;
618
619 WARN_ON_ONCE(1);
620 return 0;
8ca151b5
JB		 621}
622
623static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
624 int rate_type)
625{
626 u8 high = IWL_RATE_INVALID;
627 u8 low = IWL_RATE_INVALID;
628
629 /* 802.11A or ht walks to the next literal adjacent rate in
630 * the rate table */
631 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
632 int i;
633 u32 mask;
634
635 /* Find the previous rate that is in the rate mask */
636 i = index - 1;
637 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
638 if (rate_mask & mask) {
639 low = i;
640 break;
641 }
642 }
643
644 /* Find the next rate that is in the rate mask */
645 i = index + 1;
646 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
647 if (rate_mask & mask) {
648 high = i;
649 break;
650 }
651 }
652
653 return (high << 8) | low;
654 }
655
656 low = index;
657 while (low != IWL_RATE_INVALID) {
658 low = iwl_rates[low].prev_rs;
659 if (low == IWL_RATE_INVALID)
660 break;
661 if (rate_mask & (1 << low))
662 break;
663 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
664 }
665
666 high = index;
667 while (high != IWL_RATE_INVALID) {
668 high = iwl_rates[high].next_rs;
669 if (high == IWL_RATE_INVALID)
670 break;
671 if (rate_mask & (1 << high))
672 break;
673 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
674 }
675
676 return (high << 8) | low;
677}
678
679static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
680 struct iwl_scale_tbl_info *tbl,
681 u8 scale_index, u8 ht_possible)
682{
683 s32 low;
684 u16 rate_mask;
685 u16 high_low;
686 u8 switch_to_legacy = 0;
8ca151b5
JB		 687 struct iwl_mvm *mvm = lq_sta->drv;
688
689 /* check if we need to switch from HT to legacy rates.
690 * assumption is that mandatory rates (1Mbps or 6Mbps)
691 * are always supported (spec demand) */
692 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
693 switch_to_legacy = 1;
694 scale_index = rs_ht_to_legacy[scale_index];
695 if (lq_sta->band == IEEE80211_BAND_5GHZ)
d310e405 696 tbl->lq_type = LQ_LEGACY_A;
8ca151b5 697 else
d310e405 698 tbl->lq_type = LQ_LEGACY_G;
8ca151b5
JB		 699
700 if (num_of_ant(tbl->ant_type) > 1)
701 tbl->ant_type =
ff402312 702 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
8ca151b5 703
d310e405 704 tbl->bw = 0;
8ca151b5
JB		 705 tbl->is_SGI = 0;
706 tbl->max_search = IWL_MAX_SEARCH;
707 }
708
709 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
710
711 /* Mask with station rate restriction */
712 if (is_legacy(tbl->lq_type)) {
713 /* supp_rates has no CCK bits in A mode */
714 if (lq_sta->band == IEEE80211_BAND_5GHZ)
715 rate_mask = (u16)(rate_mask &
716 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
717 else
718 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
719 }
720
721 /* If we switched from HT to legacy, check current rate */
722 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
723 low = scale_index;
724 goto out;
725 }
726
727 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
728 tbl->lq_type);
729 low = high_low & 0xff;
730
731 if (low == IWL_RATE_INVALID)
732 low = scale_index;
733
734out:
6a524f48 735 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low);
8ca151b5
JB		 736}
737
738/*
739 * Simple function to compare two rate scale table types
740 */
741static bool table_type_matches(struct iwl_scale_tbl_info *a,
742 struct iwl_scale_tbl_info *b)
743{
744 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
745 (a->is_SGI == b->is_SGI);
746}
747
d310e405
ES		 748static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
749{
750 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
751 return RATE_MCS_CHAN_WIDTH_40;
752 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
753 return RATE_MCS_CHAN_WIDTH_80;
754 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
755 return RATE_MCS_CHAN_WIDTH_160;
756
757 return RATE_MCS_CHAN_WIDTH_20;
758}
759
8ca151b5
JB		 760/*
761 * mac80211 sends us Tx status
762 */
763static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
764 struct ieee80211_sta *sta, void *priv_sta,
765 struct sk_buff *skb)
766{
767 int legacy_success;
768 int retries;
769 int rs_index, mac_index, i;
770 struct iwl_lq_sta *lq_sta = priv_sta;
771 struct iwl_lq_cmd *table;
772 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
773 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
774 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
775 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
776 enum mac80211_rate_control_flags mac_flags;
777 u32 tx_rate;
778 struct iwl_scale_tbl_info tbl_type;
779 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
780
8ca151b5
JB		 781 /* Treat uninitialized rate scaling data same as non-existing. */
782 if (!lq_sta) {
783 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
784 return;
785 } else if (!lq_sta->drv) {
786 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
787 return;
788 }
789
790 if (!ieee80211_is_data(hdr->frame_control) ||
791 info->flags & IEEE80211_TX_CTL_NO_ACK)
792 return;
793
794 /* This packet was aggregated but doesn't carry status info */
795 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
796 !(info->flags & IEEE80211_TX_STAT_AMPDU))
797 return;
798
799 /*
800 * Ignore this Tx frame response if its initial rate doesn't match
801 * that of latest Link Quality command. There may be stragglers
802 * from a previous Link Quality command, but we're no longer interested
803 * in those; they're either from the "active" mode while we're trying
804 * to check "search" mode, or a prior "search" mode after we've moved
805 * to a new "search" mode (which might become the new "active" mode).
806 */
807 table = &lq_sta->lq;
808 tx_rate = le32_to_cpu(table->rs_table[0]);
809 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index);
810 if (info->band == IEEE80211_BAND_5GHZ)
811 rs_index -= IWL_FIRST_OFDM_RATE;
812 mac_flags = info->status.rates[0].flags;
813 mac_index = info->status.rates[0].idx;
814 /* For HT packets, map MCS to PLCP */
815 if (mac_flags & IEEE80211_TX_RC_MCS) {
816 /* Remove # of streams */
817 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
818 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
819 mac_index++;
820 /*
821 * mac80211 HT index is always zero-indexed; we need to move
822 * HT OFDM rates after CCK rates in 2.4 GHz band
823 */
824 if (info->band == IEEE80211_BAND_2GHZ)
825 mac_index += IWL_FIRST_OFDM_RATE;
d310e405
ES		 826 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
827 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
828 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
829 mac_index++;
8ca151b5 830 }
d310e405 831
8ca151b5
JB		 832 /* Here we actually compare this rate to the latest LQ command */
833 if ((mac_index < 0) ||
834 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
d310e405 835 (tbl_type.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
8ca151b5
JB		 836 (tbl_type.ant_type != info->status.antenna) ||
837 (!!(tx_rate & RATE_MCS_HT_MSK) !=
d310e405
ES		 838 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
839 (!!(tx_rate & RATE_MCS_VHT_MSK) !=
840 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
8ca151b5 841 (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
d310e405 842 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
8ca151b5
JB		 843 (rs_index != mac_index)) {
844 IWL_DEBUG_RATE(mvm,
845 "initial rate %d does not match %d (0x%x)\n",
846 mac_index, rs_index, tx_rate);
847 /*
848 * Since rates mis-match, the last LQ command may have failed.
849 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
850 * ... driver.
851 */
852 lq_sta->missed_rate_counter++;
853 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
854 lq_sta->missed_rate_counter = 0;
9e680946 855 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 856 }
857 /* Regardless, ignore this status info for outdated rate */
858 return;
859 } else
860 /* Rate did match, so reset the missed_rate_counter */
861 lq_sta->missed_rate_counter = 0;
862
863 /* Figure out if rate scale algorithm is in active or search table */
864 if (table_type_matches(&tbl_type,
865 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
866 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
867 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
868 } else if (table_type_matches(
869 &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
870 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
871 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
872 } else {
873 IWL_DEBUG_RATE(mvm,
874 "Neither active nor search matches tx rate\n");
875 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
876 IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n",
877 tmp_tbl->lq_type, tmp_tbl->ant_type,
878 tmp_tbl->is_SGI);
879 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
880 IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n",
881 tmp_tbl->lq_type, tmp_tbl->ant_type,
882 tmp_tbl->is_SGI);
883 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
884 tbl_type.lq_type, tbl_type.ant_type,
885 tbl_type.is_SGI);
886 /*
887 * no matching table found, let's by-pass the data collection
888 * and continue to perform rate scale to find the rate table
889 */
890 rs_stay_in_table(lq_sta, true);
891 goto done;
892 }
893
894 /*
895 * Updating the frame history depends on whether packets were
896 * aggregated.
897 *
898 * For aggregation, all packets were transmitted at the same rate, the
899 * first index into rate scale table.
900 */
901 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
902 tx_rate = le32_to_cpu(table->rs_table[0]);
903 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type,
904 &rs_index);
905 rs_collect_tx_data(curr_tbl, rs_index,
906 info->status.ampdu_len,
907 info->status.ampdu_ack_len);
908
909 /* Update success/fail counts if not searching for new mode */
910 if (lq_sta->stay_in_tbl) {
911 lq_sta->total_success += info->status.ampdu_ack_len;
912 lq_sta->total_failed += (info->status.ampdu_len -
913 info->status.ampdu_ack_len);
914 }
915 } else {
916 /*
917 * For legacy, update frame history with for each Tx retry.
918 */
919 retries = info->status.rates[0].count - 1;
920 /* HW doesn't send more than 15 retries */
921 retries = min(retries, 15);
922
923 /* The last transmission may have been successful */
924 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
925 /* Collect data for each rate used during failed TX attempts */
926 for (i = 0; i <= retries; ++i) {
927 tx_rate = le32_to_cpu(table->rs_table[i]);
928 rs_get_tbl_info_from_mcs(tx_rate, info->band,
929 &tbl_type, &rs_index);
930 /*
931 * Only collect stats if retried rate is in the same RS
932 * table as active/search.
933 */
934 if (table_type_matches(&tbl_type, curr_tbl))
935 tmp_tbl = curr_tbl;
936 else if (table_type_matches(&tbl_type, other_tbl))
937 tmp_tbl = other_tbl;
938 else
939 continue;
940 rs_collect_tx_data(tmp_tbl, rs_index, 1,
941 i < retries ? 0 : legacy_success);
942 }
943
944 /* Update success/fail counts if not searching for new mode */
945 if (lq_sta->stay_in_tbl) {
946 lq_sta->total_success += legacy_success;
947 lq_sta->total_failed += retries + (1 - legacy_success);
948 }
949 }
950 /* The last TX rate is cached in lq_sta; it's set in if/else above */
951 lq_sta->last_rate_n_flags = tx_rate;
952done:
953 /* See if there's a better rate or modulation mode to try. */
954 if (sta && sta->supp_rates[sband->band])
955 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
956}
957
958/*
959 * Begin a period of staying with a selected modulation mode.
960 * Set "stay_in_tbl" flag to prevent any mode switches.
961 * Set frame tx success limits according to legacy vs. high-throughput,
962 * and reset overall (spanning all rates) tx success history statistics.
963 * These control how long we stay using same modulation mode before
964 * searching for a new mode.
965 */
966static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
967 struct iwl_lq_sta *lq_sta)
968{
969 IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
970 lq_sta->stay_in_tbl = 1; /* only place this gets set */
971 if (is_legacy) {
972 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
973 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
974 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
975 } else {
976 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
977 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
978 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
979 }
980 lq_sta->table_count = 0;
981 lq_sta->total_failed = 0;
982 lq_sta->total_success = 0;
983 lq_sta->flush_timer = jiffies;
984 lq_sta->action_counter = 0;
985}
986
987/*
988 * Find correct throughput table for given mode of modulation
989 */
990static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
991 struct iwl_scale_tbl_info *tbl)
992{
993 /* Used to choose among HT tables */
994 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
995
996 /* Check for invalid LQ type */
d310e405
ES		 997 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_ht(tbl->lq_type) &&
998 !(is_vht(tbl->lq_type)))) {
8ca151b5
JB		 999 tbl->expected_tpt = expected_tpt_legacy;
1000 return;
1001 }
1002
1003 /* Legacy rates have only one table */
1004 if (is_legacy(tbl->lq_type)) {
1005 tbl->expected_tpt = expected_tpt_legacy;
1006 return;
1007 }
1008
d310e405 1009 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
8ca151b5 1010 /* Choose among many HT tables depending on number of streams
d310e405 1011 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
8ca151b5 1012 * status */
d310e405
ES		 1013 if (is_siso(tbl->lq_type)) {
1014 switch (tbl->bw) {
1015 case RATE_MCS_CHAN_WIDTH_20:
1016 ht_tbl_pointer = expected_tpt_siso_20MHz;
1017 break;
1018 case RATE_MCS_CHAN_WIDTH_40:
1019 ht_tbl_pointer = expected_tpt_siso_40MHz;
1020 break;
1021 case RATE_MCS_CHAN_WIDTH_80:
1022 ht_tbl_pointer = expected_tpt_siso_80MHz;
1023 break;
1024 default:
1025 WARN_ON_ONCE(1);
1026 }
1027 } else if (is_mimo2(tbl->lq_type)) {
1028 switch (tbl->bw) {
1029 case RATE_MCS_CHAN_WIDTH_20:
1030 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1031 break;
1032 case RATE_MCS_CHAN_WIDTH_40:
1033 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1034 break;
1035 case RATE_MCS_CHAN_WIDTH_80:
1036 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1037 break;
1038 default:
1039 WARN_ON_ONCE(1);
1040 }
1041 } else {
1042 WARN_ON_ONCE(1);
d972ab31 1043 }
8ca151b5
JB		 1044
1045 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1046 tbl->expected_tpt = ht_tbl_pointer[0];
1047 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1048 tbl->expected_tpt = ht_tbl_pointer[1];
1049 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1050 tbl->expected_tpt = ht_tbl_pointer[2];
1051 else /* AGG+SGI */
1052 tbl->expected_tpt = ht_tbl_pointer[3];
1053}
1054
1055/*
1056 * Find starting rate for new "search" high-throughput mode of modulation.
1057 * Goal is to find lowest expected rate (under perfect conditions) that is
1058 * above the current measured throughput of "active" mode, to give new mode
1059 * a fair chance to prove itself without too many challenges.
1060 *
1061 * This gets called when transitioning to more aggressive modulation
1062 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1063 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1064 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1065 * bit rate will typically need to increase, but not if performance was bad.
1066 */
1067static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1068 struct iwl_lq_sta *lq_sta,
1069 struct iwl_scale_tbl_info *tbl, /* "search" */
1070 u16 rate_mask, s8 index)
1071{
1072 /* "active" values */
1073 struct iwl_scale_tbl_info *active_tbl =
1074 &(lq_sta->lq_info[lq_sta->active_tbl]);
1075 s32 active_sr = active_tbl->win[index].success_ratio;
1076 s32 active_tpt = active_tbl->expected_tpt[index];
1077
1078 /* expected "search" throughput */
1079 s32 *tpt_tbl = tbl->expected_tpt;
1080
1081 s32 new_rate, high, low, start_hi;
1082 u16 high_low;
1083 s8 rate = index;
1084
1085 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1086
1087 while (1) {
1088 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1089 tbl->lq_type);
1090
1091 low = high_low & 0xff;
1092 high = (high_low >> 8) & 0xff;
1093
1094 /*
1095 * Lower the "search" bit rate, to give new "search" mode
1096 * approximately the same throughput as "active" if:
1097 *
1098 * 1) "Active" mode has been working modestly well (but not
1099 * great), and expected "search" throughput (under perfect
1100 * conditions) at candidate rate is above the actual
1101 * measured "active" throughput (but less than expected
1102 * "active" throughput under perfect conditions).
1103 * OR
1104 * 2) "Active" mode has been working perfectly or very well
1105 * and expected "search" throughput (under perfect
1106 * conditions) at candidate rate is above expected
1107 * "active" throughput (under perfect conditions).
1108 */
1109 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1110 ((active_sr > IWL_RATE_DECREASE_TH) &&
1111 (active_sr <= IWL_RATE_HIGH_TH) &&
1112 (tpt_tbl[rate] <= active_tpt))) ||
1113 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1114 (tpt_tbl[rate] > active_tpt))) {
1115 /* (2nd or later pass)
1116 * If we've already tried to raise the rate, and are
1117 * now trying to lower it, use the higher rate. */
1118 if (start_hi != IWL_RATE_INVALID) {
1119 new_rate = start_hi;
1120 break;
1121 }
1122
1123 new_rate = rate;
1124
1125 /* Loop again with lower rate */
1126 if (low != IWL_RATE_INVALID)
1127 rate = low;
1128
1129 /* Lower rate not available, use the original */
1130 else
1131 break;
1132
1133 /* Else try to raise the "search" rate to match "active" */
1134 } else {
1135 /* (2nd or later pass)
1136 * If we've already tried to lower the rate, and are
1137 * now trying to raise it, use the lower rate. */
1138 if (new_rate != IWL_RATE_INVALID)
1139 break;
1140
1141 /* Loop again with higher rate */
1142 else if (high != IWL_RATE_INVALID) {
1143 start_hi = high;
1144 rate = high;
1145
1146 /* Higher rate not available, use the original */
1147 } else {
1148 new_rate = rate;
1149 break;
1150 }
1151 }
1152 }
1153
1154 return new_rate;
1155}
1156
4837b448
ES		 1157/* Move to the next action and wrap around to the first action in case
1158 * we're at the last action. Assumes actions start at 0.
1159 */
1160static inline void rs_move_next_action(struct iwl_scale_tbl_info *tbl,
1161 u8 last_action)
1162{
1163 BUILD_BUG_ON(IWL_LEGACY_FIRST_ACTION != 0);
1164 BUILD_BUG_ON(IWL_SISO_FIRST_ACTION != 0);
1165 BUILD_BUG_ON(IWL_MIMO2_FIRST_ACTION != 0);
1166
1167 tbl->action = (tbl->action + 1) % (last_action + 1);
1168}
1169
d310e405
ES		 1170static void rs_set_bw_from_sta(struct iwl_scale_tbl_info *tbl,
1171 struct ieee80211_sta *sta)
1172{
1173 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1174 tbl->bw = RATE_MCS_CHAN_WIDTH_80;
1175 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1176 tbl->bw = RATE_MCS_CHAN_WIDTH_40;
1177 else
1178 tbl->bw = RATE_MCS_CHAN_WIDTH_20;
1179}
1180
1181static bool rs_sgi_allowed(struct iwl_scale_tbl_info *tbl,
1182 struct ieee80211_sta *sta)
1183{
1184 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1185 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
1186
1187 if (is_ht20(tbl) && (ht_cap->cap &
1188 IEEE80211_HT_CAP_SGI_20))
1189 return true;
1190 if (is_ht40(tbl) && (ht_cap->cap &
1191 IEEE80211_HT_CAP_SGI_40))
1192 return true;
1193 if (is_ht80(tbl) && (vht_cap->cap &
1194 IEEE80211_VHT_CAP_SHORT_GI_80))
1195 return true;
1196
1197 return false;
1198}
1199
8ca151b5
JB		 1200/*
1201 * Set up search table for MIMO2
1202 */
1203static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1204 struct iwl_lq_sta *lq_sta,
1205 struct ieee80211_sta *sta,
1206 struct iwl_scale_tbl_info *tbl, int index)
1207{
1208 u16 rate_mask;
1209 s32 rate;
8ca151b5
JB		 1210
1211 if (!sta->ht_cap.ht_supported)
1212 return -1;
1213
af0ed69b 1214 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
8ca151b5
JB		 1215 return -1;
1216
1217 /* Need both Tx chains/antennas to support MIMO */
ff402312 1218 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
8ca151b5
JB		 1219 return -1;
1220
1221 IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1222
d310e405 1223 tbl->lq_type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
8ca151b5
JB		 1224 tbl->action = 0;
1225 tbl->max_search = IWL_MAX_SEARCH;
1226 rate_mask = lq_sta->active_mimo2_rate;
1227
d310e405 1228 rs_set_bw_from_sta(tbl, sta);
8ca151b5
JB		 1229 rs_set_expected_tpt_table(lq_sta, tbl);
1230
1231 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1232
1233 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
1234 rate, rate_mask);
1235 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1236 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1237 rate, rate_mask);
1238 return -1;
1239 }
6a524f48 1240 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate);
8ca151b5 1241
6a524f48
ES		 1242 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index\n",
1243 tbl->current_rate);
8ca151b5
JB		 1244 return 0;
1245}
1246
8ca151b5
JB		 1247/*
1248 * Set up search table for SISO
1249 */
1250static int rs_switch_to_siso(struct iwl_mvm *mvm,
1251 struct iwl_lq_sta *lq_sta,
1252 struct ieee80211_sta *sta,
1253 struct iwl_scale_tbl_info *tbl, int index)
1254{
1255 u16 rate_mask;
8ca151b5
JB		 1256 s32 rate;
1257
1258 if (!sta->ht_cap.ht_supported)
1259 return -1;
1260
1261 IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1262
d310e405 1263 tbl->lq_type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
8ca151b5
JB		 1264 tbl->action = 0;
1265 tbl->max_search = IWL_MAX_SEARCH;
1266 rate_mask = lq_sta->active_siso_rate;
1267
d310e405 1268 rs_set_bw_from_sta(tbl, sta);
8ca151b5
JB		 1269 rs_set_expected_tpt_table(lq_sta, tbl);
1270 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1271
1272 IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1273 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1274 IWL_DEBUG_RATE(mvm,
1275 "can not switch with index %d rate mask %x\n",
1276 rate, rate_mask);
1277 return -1;
1278 }
6a524f48
ES		 1279 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate);
1280 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index\n",
1281 tbl->current_rate);
8ca151b5
JB		 1282 return 0;
1283}
1284
1285/*
1286 * Try to switch to new modulation mode from legacy
1287 */
1288static int rs_move_legacy_other(struct iwl_mvm *mvm,
1289 struct iwl_lq_sta *lq_sta,
1290 struct ieee80211_sta *sta,
1291 int index)
1292{
1293 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1294 struct iwl_scale_tbl_info *search_tbl =
1295 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1296 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1297 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1298 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1299 u8 start_action;
ff402312 1300 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1301 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1302 int ret;
1303 u8 update_search_tbl_counter = 0;
1304
1305 start_action = tbl->action;
1306 while (1) {
1307 lq_sta->action_counter++;
1308 switch (tbl->action) {
4837b448 1309 case IWL_LEGACY_SWITCH_ANTENNA:
8ca151b5
JB		 1310 IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1311
4837b448 1312 if (tx_chains_num <= 1)
8ca151b5
JB		 1313 break;
1314
1315 /* Don't change antenna if success has been great */
1316 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1317 break;
1318
1319 /* Set up search table to try other antenna */
1320 memcpy(search_tbl, tbl, sz);
1321
1322 if (rs_toggle_antenna(valid_tx_ant,
1323 &search_tbl->current_rate,
1324 search_tbl)) {
1325 update_search_tbl_counter = 1;
1326 rs_set_expected_tpt_table(lq_sta, search_tbl);
1327 goto out;
1328 }
1329 break;
1330 case IWL_LEGACY_SWITCH_SISO:
1331 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1332
1333 /* Set up search table to try SISO */
1334 memcpy(search_tbl, tbl, sz);
1335 search_tbl->is_SGI = 0;
1336 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1337 search_tbl, index);
1338 if (!ret) {
1339 lq_sta->action_counter = 0;
1340 goto out;
1341 }
1342
1343 break;
d972ab31 1344 case IWL_LEGACY_SWITCH_MIMO2:
8ca151b5
JB		 1345 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1346
1347 /* Set up search table to try MIMO */
1348 memcpy(search_tbl, tbl, sz);
1349 search_tbl->is_SGI = 0;
1350
d972ab31 1351 search_tbl->ant_type = ANT_AB;
8ca151b5
JB		 1352
1353 if (!rs_is_valid_ant(valid_tx_ant,
1354 search_tbl->ant_type))
1355 break;
1356
1357 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1358 search_tbl, index);
1359 if (!ret) {
1360 lq_sta->action_counter = 0;
1361 goto out;
1362 }
1363 break;
d972ab31
ES		 1364 default:
1365 WARN_ON_ONCE(1);
8ca151b5 1366 }
4837b448 1367 rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
8ca151b5
JB		 1368
1369 if (tbl->action == start_action)
1370 break;
1371 }
1372 search_tbl->lq_type = LQ_NONE;
1373 return 0;
1374
1375out:
1376 lq_sta->search_better_tbl = 1;
4837b448 1377 rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
8ca151b5
JB		 1378 if (update_search_tbl_counter)
1379 search_tbl->action = tbl->action;
1380 return 0;
1381}
1382
1383/*
1384 * Try to switch to new modulation mode from SISO
1385 */
1386static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1387 struct iwl_lq_sta *lq_sta,
1388 struct ieee80211_sta *sta, int index)
1389{
8ca151b5
JB		 1390 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1391 struct iwl_scale_tbl_info *search_tbl =
1392 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1393 struct iwl_rate_scale_data *window = &(tbl->win[index]);
8ca151b5
JB		 1394 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1395 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1396 u8 start_action;
ff402312 1397 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1398 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1399 u8 update_search_tbl_counter = 0;
1400 int ret;
1401
ffa6c707
EG		 1402 if (tbl->action == IWL_SISO_SWITCH_MIMO2 &&
1403 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
22f6642c 1404 tbl->action = IWL_SISO_SWITCH_ANTENNA;
36946ce6 1405
8ca151b5
JB		 1406 start_action = tbl->action;
1407 while (1) {
1408 lq_sta->action_counter++;
1409 switch (tbl->action) {
4837b448 1410 case IWL_SISO_SWITCH_ANTENNA:
8ca151b5 1411 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
4837b448 1412 if (tx_chains_num <= 1)
8ca151b5
JB		 1413 break;
1414
36946ce6
EG		 1415 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1416 BT_MBOX_MSG(&mvm->last_bt_notif, 3,
1417 TRAFFIC_LOAD) == 0)
8ca151b5
JB		 1418 break;
1419
1420 memcpy(search_tbl, tbl, sz);
1421 if (rs_toggle_antenna(valid_tx_ant,
1422 &search_tbl->current_rate,
1423 search_tbl)) {
1424 update_search_tbl_counter = 1;
1425 goto out;
1426 }
1427 break;
d972ab31 1428 case IWL_SISO_SWITCH_MIMO2:
8ca151b5
JB		 1429 IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1430 memcpy(search_tbl, tbl, sz);
1431 search_tbl->is_SGI = 0;
1432
d972ab31 1433 search_tbl->ant_type = ANT_AB;
8ca151b5
JB		 1434
1435 if (!rs_is_valid_ant(valid_tx_ant,
1436 search_tbl->ant_type))
1437 break;
1438
1439 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1440 search_tbl, index);
1441 if (!ret)
1442 goto out;
1443 break;
1444 case IWL_SISO_SWITCH_GI:
d310e405 1445 if (!rs_sgi_allowed(tbl, sta))
8ca151b5
JB		 1446 break;
1447
1448 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1449
1450 memcpy(search_tbl, tbl, sz);
8ca151b5
JB		 1451 search_tbl->is_SGI = !tbl->is_SGI;
1452 rs_set_expected_tpt_table(lq_sta, search_tbl);
1453 if (tbl->is_SGI) {
1454 s32 tpt = lq_sta->last_tpt / 100;
1455 if (tpt >= search_tbl->expected_tpt[index])
1456 break;
1457 }
1458 search_tbl->current_rate =
6a524f48 1459 rate_n_flags_from_tbl(mvm, search_tbl, index);
8ca151b5
JB		 1460 update_search_tbl_counter = 1;
1461 goto out;
d972ab31
ES		 1462 default:
1463 WARN_ON_ONCE(1);
8ca151b5 1464 }
4837b448 1465 rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
8ca151b5
JB		 1466
1467 if (tbl->action == start_action)
1468 break;
1469 }
1470 search_tbl->lq_type = LQ_NONE;
1471 return 0;
1472
1473 out:
1474 lq_sta->search_better_tbl = 1;
4837b448 1475 rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
8ca151b5
JB		 1476 if (update_search_tbl_counter)
1477 search_tbl->action = tbl->action;
1478
1479 return 0;
1480}
1481
1482/*
1483 * Try to switch to new modulation mode from MIMO2
1484 */
1485static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1486 struct iwl_lq_sta *lq_sta,
1487 struct ieee80211_sta *sta, int index)
1488{
8ca151b5
JB		 1489 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1490 struct iwl_scale_tbl_info *search_tbl =
1491 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
8ca151b5
JB		 1492 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1493 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1494 u8 start_action;
ff402312 1495 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 1496 u8 update_search_tbl_counter = 0;
1497 int ret;
1498
4d30ee82
ES		 1499 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
1500 IWL_DEBUG_RATE(mvm, "BT COEX force switch to SISO A\n");
393b9e5b 1501 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
4d30ee82 1502 }
393b9e5b 1503
8ca151b5
JB		 1504 start_action = tbl->action;
1505 while (1) {
1506 lq_sta->action_counter++;
1507 switch (tbl->action) {
8ca151b5
JB		 1508 case IWL_MIMO2_SWITCH_SISO_A:
1509 case IWL_MIMO2_SWITCH_SISO_B:
8ca151b5
JB		 1510 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1511
1512 /* Set up new search table for SISO */
1513 memcpy(search_tbl, tbl, sz);
1514
1515 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1516 search_tbl->ant_type = ANT_A;
d972ab31 1517 else /* tbl->action == IWL_MIMO2_SWITCH_SISO_B */
8ca151b5 1518 search_tbl->ant_type = ANT_B;
8ca151b5
JB		 1519
1520 if (!rs_is_valid_ant(valid_tx_ant,
1521 search_tbl->ant_type))
1522 break;
1523
1524 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1525 search_tbl, index);
1526 if (!ret)
1527 goto out;
1528
1529 break;
1530
1531 case IWL_MIMO2_SWITCH_GI:
d310e405 1532 if (!rs_sgi_allowed(tbl, sta))
8ca151b5
JB		 1533 break;
1534
1535 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1536
1537 /* Set up new search table for MIMO2 */
1538 memcpy(search_tbl, tbl, sz);
1539 search_tbl->is_SGI = !tbl->is_SGI;
1540 rs_set_expected_tpt_table(lq_sta, search_tbl);
1541 /*
1542 * If active table already uses the fastest possible
1543 * modulation (dual stream with short guard interval),
1544 * and it's working well, there's no need to look
1545 * for a better type of modulation!
1546 */
1547 if (tbl->is_SGI) {
1548 s32 tpt = lq_sta->last_tpt / 100;
1549 if (tpt >= search_tbl->expected_tpt[index])
1550 break;
1551 }
1552 search_tbl->current_rate =
6a524f48 1553 rate_n_flags_from_tbl(mvm, search_tbl, index);
8ca151b5
JB		 1554 update_search_tbl_counter = 1;
1555 goto out;
d972ab31
ES		 1556 default:
1557 WARN_ON_ONCE(1);
8ca151b5 1558 }
4837b448 1559 rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
8ca151b5
JB		 1560
1561 if (tbl->action == start_action)
1562 break;
1563 }
1564 search_tbl->lq_type = LQ_NONE;
1565 return 0;
1566 out:
1567 lq_sta->search_better_tbl = 1;
4837b448 1568 rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
8ca151b5
JB		 1569 if (update_search_tbl_counter)
1570 search_tbl->action = tbl->action;
1571
1572 return 0;
1573}
1574
8ca151b5
JB		 1575/*
1576 * Check whether we should continue using same modulation mode, or
1577 * begin search for a new mode, based on:
1578 * 1) # tx successes or failures while using this mode
1579 * 2) # times calling this function
1580 * 3) elapsed time in this mode (not used, for now)
1581 */
1582static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1583{
1584 struct iwl_scale_tbl_info *tbl;
1585 int i;
1586 int active_tbl;
1587 int flush_interval_passed = 0;
1588 struct iwl_mvm *mvm;
1589
1590 mvm = lq_sta->drv;
1591 active_tbl = lq_sta->active_tbl;
1592
1593 tbl = &(lq_sta->lq_info[active_tbl]);
1594
1595 /* If we've been disallowing search, see if we should now allow it */
1596 if (lq_sta->stay_in_tbl) {
1597 /* Elapsed time using current modulation mode */
1598 if (lq_sta->flush_timer)
1599 flush_interval_passed =
1600 time_after(jiffies,
1601 (unsigned long)(lq_sta->flush_timer +
1602 IWL_RATE_SCALE_FLUSH_INTVL));
1603
1604 /*
1605 * Check if we should allow search for new modulation mode.
1606 * If many frames have failed or succeeded, or we've used
1607 * this same modulation for a long time, allow search, and
1608 * reset history stats that keep track of whether we should
1609 * allow a new search. Also (below) reset all bitmaps and
1610 * stats in active history.
1611 */
1612 if (force_search ||
1613 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1614 (lq_sta->total_success > lq_sta->max_success_limit) ||
1615 ((!lq_sta->search_better_tbl) &&
1616 (lq_sta->flush_timer) && (flush_interval_passed))) {
1617 IWL_DEBUG_RATE(mvm,
1618 "LQ: stay is expired %d %d %d\n",
1619 lq_sta->total_failed,
1620 lq_sta->total_success,
1621 flush_interval_passed);
1622
1623 /* Allow search for new mode */
1624 lq_sta->stay_in_tbl = 0; /* only place reset */
1625 lq_sta->total_failed = 0;
1626 lq_sta->total_success = 0;
1627 lq_sta->flush_timer = 0;
1628 /*
1629 * Else if we've used this modulation mode enough repetitions
1630 * (regardless of elapsed time or success/failure), reset
1631 * history bitmaps and rate-specific stats for all rates in
1632 * active table.
1633 */
1634 } else {
1635 lq_sta->table_count++;
1636 if (lq_sta->table_count >=
1637 lq_sta->table_count_limit) {
1638 lq_sta->table_count = 0;
1639
1640 IWL_DEBUG_RATE(mvm,
1641 "LQ: stay in table clear win\n");
1642 for (i = 0; i < IWL_RATE_COUNT; i++)
1643 rs_rate_scale_clear_window(
1644 &(tbl->win[i]));
1645 }
1646 }
1647
1648 /* If transitioning to allow "search", reset all history
1649 * bitmaps and stats in active table (this will become the new
1650 * "search" table). */
1651 if (!lq_sta->stay_in_tbl) {
1652 for (i = 0; i < IWL_RATE_COUNT; i++)
1653 rs_rate_scale_clear_window(&(tbl->win[i]));
1654 }
1655 }
1656}
1657
1658/*
1659 * setup rate table in uCode
1660 */
1661static void rs_update_rate_tbl(struct iwl_mvm *mvm,
9145d151 1662 struct ieee80211_sta *sta,
8ca151b5
JB		 1663 struct iwl_lq_sta *lq_sta,
1664 struct iwl_scale_tbl_info *tbl,
6a524f48 1665 int index)
8ca151b5
JB		 1666{
1667 u32 rate;
1668
1669 /* Update uCode's rate table. */
6a524f48 1670 rate = rate_n_flags_from_tbl(mvm, tbl, index);
9145d151 1671 rs_fill_link_cmd(mvm, sta, lq_sta, rate);
9e680946 1672 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 1673}
1674
977342bc
ES		 1675static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1676 struct ieee80211_hdr *hdr)
1677{
1678 u8 tid = IWL_MAX_TID_COUNT;
1679
1680 if (ieee80211_is_data_qos(hdr->frame_control)) {
1681 u8 *qc = ieee80211_get_qos_ctl(hdr);
1682 tid = qc[0] & 0xf;
1683 }
1684
1685 if (unlikely(tid > IWL_MAX_TID_COUNT))
1686 tid = IWL_MAX_TID_COUNT;
1687
1688 return tid;
1689}
1690
8ca151b5
JB		 1691/*
1692 * Do rate scaling and search for new modulation mode.
1693 */
1694static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1695 struct sk_buff *skb,
1696 struct ieee80211_sta *sta,
1697 struct iwl_lq_sta *lq_sta)
1698{
1699 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1700 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1701 int low = IWL_RATE_INVALID;
1702 int high = IWL_RATE_INVALID;
1703 int index;
1704 int i;
1705 struct iwl_rate_scale_data *window = NULL;
1706 int current_tpt = IWL_INVALID_VALUE;
1707 int low_tpt = IWL_INVALID_VALUE;
1708 int high_tpt = IWL_INVALID_VALUE;
1709 u32 fail_count;
1710 s8 scale_action = 0;
1711 u16 rate_mask;
1712 u8 update_lq = 0;
1713 struct iwl_scale_tbl_info *tbl, *tbl1;
1714 u16 rate_scale_index_msk = 0;
8ca151b5
JB		 1715 u8 active_tbl = 0;
1716 u8 done_search = 0;
1717 u16 high_low;
1718 s32 sr;
1719 u8 tid = IWL_MAX_TID_COUNT;
1720 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1721 struct iwl_mvm_tid_data *tid_data;
1722
8ca151b5
JB		 1723 /* Send management frames and NO_ACK data using lowest rate. */
1724 /* TODO: this could probably be improved.. */
1725 if (!ieee80211_is_data(hdr->frame_control) ||
1726 info->flags & IEEE80211_TX_CTL_NO_ACK)
1727 return;
1728
1729 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1730
977342bc 1731 tid = rs_get_tid(lq_sta, hdr);
8ca151b5
JB		 1732 if ((tid != IWL_MAX_TID_COUNT) &&
1733 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1734 tid_data = &sta_priv->tid_data[tid];
1735 if (tid_data->state == IWL_AGG_OFF)
1736 lq_sta->is_agg = 0;
1737 else
1738 lq_sta->is_agg = 1;
1739 } else {
1740 lq_sta->is_agg = 0;
1741 }
1742
1743 /*
1744 * Select rate-scale / modulation-mode table to work with in
1745 * the rest of this function: "search" if searching for better
1746 * modulation mode, or "active" if doing rate scaling within a mode.
1747 */
1748 if (!lq_sta->search_better_tbl)
1749 active_tbl = lq_sta->active_tbl;
1750 else
1751 active_tbl = 1 - lq_sta->active_tbl;
1752
1753 tbl = &(lq_sta->lq_info[active_tbl]);
8ca151b5
JB		 1754
1755 /* current tx rate */
1756 index = lq_sta->last_txrate_idx;
1757
8ca151b5
JB		 1758 /* rates available for this association, and for modulation mode */
1759 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1760
8ca151b5
JB		 1761 /* mask with station rate restriction */
1762 if (is_legacy(tbl->lq_type)) {
1763 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1764 /* supp_rates has no CCK bits in A mode */
1765 rate_scale_index_msk = (u16) (rate_mask &
1766 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1767 else
1768 rate_scale_index_msk = (u16) (rate_mask &
1769 lq_sta->supp_rates);
1770
1771 } else {
1772 rate_scale_index_msk = rate_mask;
1773 }
1774
1775 if (!rate_scale_index_msk)
1776 rate_scale_index_msk = rate_mask;
1777
1778 if (!((1 << index) & rate_scale_index_msk)) {
1779 IWL_ERR(mvm, "Current Rate is not valid\n");
1780 if (lq_sta->search_better_tbl) {
1781 /* revert to active table if search table is not valid*/
1782 tbl->lq_type = LQ_NONE;
1783 lq_sta->search_better_tbl = 0;
1784 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1785 /* get "active" rate info */
1786 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
9145d151 1787 rs_update_rate_tbl(mvm, sta, lq_sta, tbl, index);
8ca151b5
JB		 1788 }
1789 return;
1790 }
1791
1792 /* Get expected throughput table and history window for current rate */
1793 if (!tbl->expected_tpt) {
1794 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1795 return;
1796 }
1797
1798 /* force user max rate if set by user */
1799 if ((lq_sta->max_rate_idx != -1) &&
1800 (lq_sta->max_rate_idx < index)) {
1801 index = lq_sta->max_rate_idx;
1802 update_lq = 1;
1803 window = &(tbl->win[index]);
4d30ee82
ES		 1804 IWL_DEBUG_RATE(mvm,
1805 "Forcing user max rate %d\n",
1806 index);
8ca151b5
JB		 1807 goto lq_update;
1808 }
1809
1810 window = &(tbl->win[index]);
1811
1812 /*
1813 * If there is not enough history to calculate actual average
1814 * throughput, keep analyzing results of more tx frames, without
1815 * changing rate or mode (bypass most of the rest of this function).
1816 * Set up new rate table in uCode only if old rate is not supported
1817 * in current association (use new rate found above).
1818 */
1819 fail_count = window->counter - window->success_counter;
1820 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1821 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1822 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1823 "(%s: %d): Test Window: succ %d total %d\n",
1824 rs_pretty_lq_type(tbl->lq_type),
1825 index, window->success_counter, window->counter);
8ca151b5
JB		 1826
1827 /* Can't calculate this yet; not enough history */
1828 window->average_tpt = IWL_INVALID_VALUE;
1829
1830 /* Should we stay with this modulation mode,
1831 * or search for a new one? */
1832 rs_stay_in_table(lq_sta, false);
1833
1834 goto out;
1835 }
1836 /* Else we have enough samples; calculate estimate of
1837 * actual average throughput */
1838 if (window->average_tpt != ((window->success_ratio *
1839 tbl->expected_tpt[index] + 64) / 128)) {
1840 IWL_ERR(mvm,
1841 "expected_tpt should have been calculated by now\n");
1842 window->average_tpt = ((window->success_ratio *
1843 tbl->expected_tpt[index] + 64) / 128);
1844 }
1845
1846 /* If we are searching for better modulation mode, check success. */
1847 if (lq_sta->search_better_tbl) {
1848 /* If good success, continue using the "search" mode;
1849 * no need to send new link quality command, since we're
1850 * continuing to use the setup that we've been trying. */
1851 if (window->average_tpt > lq_sta->last_tpt) {
1852 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1853 "SWITCHING TO NEW TABLE SR: %d "
1854 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 1855 window->success_ratio,
1856 window->average_tpt,
1857 lq_sta->last_tpt);
1858
1859 if (!is_legacy(tbl->lq_type))
1860 lq_sta->enable_counter = 1;
1861
1862 /* Swap tables; "search" becomes "active" */
1863 lq_sta->active_tbl = active_tbl;
1864 current_tpt = window->average_tpt;
1865 /* Else poor success; go back to mode in "active" table */
1866 } else {
1867 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1868 "GOING BACK TO THE OLD TABLE: SR %d "
1869 "cur-tpt %d old-tpt %d\n",
8ca151b5
JB		 1870 window->success_ratio,
1871 window->average_tpt,
1872 lq_sta->last_tpt);
1873
1874 /* Nullify "search" table */
1875 tbl->lq_type = LQ_NONE;
1876
1877 /* Revert to "active" table */
1878 active_tbl = lq_sta->active_tbl;
1879 tbl = &(lq_sta->lq_info[active_tbl]);
1880
1881 /* Revert to "active" rate and throughput info */
1882 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1883 current_tpt = lq_sta->last_tpt;
1884
1885 /* Need to set up a new rate table in uCode */
1886 update_lq = 1;
1887 }
1888
1889 /* Either way, we've made a decision; modulation mode
1890 * search is done, allow rate adjustment next time. */
1891 lq_sta->search_better_tbl = 0;
1892 done_search = 1; /* Don't switch modes below! */
1893 goto lq_update;
1894 }
1895
1896 /* (Else) not in search of better modulation mode, try for better
1897 * starting rate, while staying in this mode. */
1898 high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
1899 tbl->lq_type);
1900 low = high_low & 0xff;
1901 high = (high_low >> 8) & 0xff;
1902
1903 /* If user set max rate, dont allow higher than user constrain */
1904 if ((lq_sta->max_rate_idx != -1) &&
1905 (lq_sta->max_rate_idx < high))
1906 high = IWL_RATE_INVALID;
1907
1908 sr = window->success_ratio;
1909
1910 /* Collect measured throughputs for current and adjacent rates */
1911 current_tpt = window->average_tpt;
1912 if (low != IWL_RATE_INVALID)
1913 low_tpt = tbl->win[low].average_tpt;
1914 if (high != IWL_RATE_INVALID)
1915 high_tpt = tbl->win[high].average_tpt;
1916
4d30ee82
ES		 1917 IWL_DEBUG_RATE(mvm,
1918 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
1919 rs_pretty_lq_type(tbl->lq_type), index, current_tpt,
1920 sr, low, high, low_tpt, high_tpt);
1921
8ca151b5
JB		 1922 scale_action = 0;
1923
1924 /* Too many failures, decrease rate */
1925 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1926 IWL_DEBUG_RATE(mvm,
4d30ee82 1927 "decrease rate because of low SR\n");
8ca151b5
JB		 1928 scale_action = -1;
1929 /* No throughput measured yet for adjacent rates; try increase. */
1930 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1931 (high_tpt == IWL_INVALID_VALUE)) {
4d30ee82
ES		 1932 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) {
1933 IWL_DEBUG_RATE(mvm,
1934 "Good SR and no high rate measurement. "
1935 "Increase rate\n");
8ca151b5 1936 scale_action = 1;
4d30ee82
ES		 1937 } else if (low != IWL_RATE_INVALID) {
1938 IWL_DEBUG_RATE(mvm,
1939 "Remain in current rate\n");
8ca151b5 1940 scale_action = 0;
4d30ee82 1941 }
8ca151b5
JB		 1942 }
1943
1944 /* Both adjacent throughputs are measured, but neither one has better
1945 * throughput; we're using the best rate, don't change it! */
1946 else if ((low_tpt != IWL_INVALID_VALUE) &&
1947 (high_tpt != IWL_INVALID_VALUE) &&
1948 (low_tpt < current_tpt) &&
4d30ee82
ES		 1949 (high_tpt < current_tpt)) {
1950 IWL_DEBUG_RATE(mvm,
1951 "Both high and low are worse. "
1952 "Maintain rate\n");
8ca151b5 1953 scale_action = 0;
4d30ee82 1954 }
8ca151b5
JB		 1955
1956 /* At least one adjacent rate's throughput is measured,
1957 * and may have better performance. */
1958 else {
1959 /* Higher adjacent rate's throughput is measured */
1960 if (high_tpt != IWL_INVALID_VALUE) {
1961 /* Higher rate has better throughput */
1962 if (high_tpt > current_tpt &&
1963 sr >= IWL_RATE_INCREASE_TH) {
4d30ee82
ES		 1964 IWL_DEBUG_RATE(mvm,
1965 "Higher rate is better and good "
1966 "SR. Increate rate\n");
8ca151b5
JB		 1967 scale_action = 1;
1968 } else {
4d30ee82
ES		 1969 IWL_DEBUG_RATE(mvm,
1970 "Higher rate isn't better OR "
1971 "no good SR. Maintain rate\n");
8ca151b5
JB		 1972 scale_action = 0;
1973 }
1974
1975 /* Lower adjacent rate's throughput is measured */
1976 } else if (low_tpt != IWL_INVALID_VALUE) {
1977 /* Lower rate has better throughput */
1978 if (low_tpt > current_tpt) {
1979 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 1980 "Lower rate is better. "
1981 "Decrease rate\n");
8ca151b5
JB		 1982 scale_action = -1;
1983 } else if (sr >= IWL_RATE_INCREASE_TH) {
4d30ee82
ES		 1984 IWL_DEBUG_RATE(mvm,
1985 "Lower rate isn't better and "
1986 "good SR. Increase rate\n");
8ca151b5
JB		 1987 scale_action = 1;
1988 }
1989 }
1990 }
1991
1992 /* Sanity check; asked for decrease, but success rate or throughput
1993 * has been good at old rate. Don't change it. */
1994 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1995 ((sr > IWL_RATE_HIGH_TH) ||
4d30ee82
ES		 1996 (current_tpt > (100 * tbl->expected_tpt[low])))) {
1997 IWL_DEBUG_RATE(mvm,
1998 "Sanity check failed. Maintain rate\n");
8ca151b5 1999 scale_action = 0;
4d30ee82 2000 }
8ca151b5 2001
393b9e5b
ES		 2002 /* Force a search in case BT doesn't like us being in MIMO */
2003 if (is_mimo(tbl->lq_type) &&
2004 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
4d30ee82
ES		 2005 IWL_DEBUG_RATE(mvm,
2006 "BT Coex forbids MIMO. Search for new config\n");
36946ce6
EG		 2007 rs_stay_in_table(lq_sta, true);
2008 goto lq_update;
2009 }
2010
8ca151b5
JB		 2011 switch (scale_action) {
2012 case -1:
2013 /* Decrease starting rate, update uCode's rate table */
2014 if (low != IWL_RATE_INVALID) {
2015 update_lq = 1;
2016 index = low;
4d30ee82
ES		 2017 } else {
2018 IWL_DEBUG_RATE(mvm,
2019 "At the bottom rate. Can't decrease\n");
8ca151b5
JB		 2020 }
2021
2022 break;
2023 case 1:
2024 /* Increase starting rate, update uCode's rate table */
2025 if (high != IWL_RATE_INVALID) {
2026 update_lq = 1;
2027 index = high;
4d30ee82
ES		 2028 } else {
2029 IWL_DEBUG_RATE(mvm,
2030 "At the top rate. Can't increase\n");
8ca151b5
JB		 2031 }
2032
2033 break;
2034 case 0:
2035 /* No change */
2036 default:
2037 break;
2038 }
2039
8ca151b5
JB		 2040lq_update:
2041 /* Replace uCode's rate table for the destination station. */
2042 if (update_lq)
9145d151 2043 rs_update_rate_tbl(mvm, sta, lq_sta, tbl, index);
8ca151b5
JB		 2044
2045 rs_stay_in_table(lq_sta, false);
2046
2047 /*
2048 * Search for new modulation mode if we're:
2049 * 1) Not changing rates right now
2050 * 2) Not just finishing up a search
2051 * 3) Allowing a new search
2052 */
2053 if (!update_lq && !done_search &&
2054 !lq_sta->stay_in_tbl && window->counter) {
2055 /* Save current throughput to compare with "search" throughput*/
2056 lq_sta->last_tpt = current_tpt;
2057
4d30ee82
ES		 2058 IWL_DEBUG_RATE(mvm,
2059 "Start Search: update_lq %d done_search %d stay_in_tbl %d win->counter %d\n",
2060 update_lq, done_search, lq_sta->stay_in_tbl,
2061 window->counter);
8ca151b5
JB		 2062 /* Select a new "search" modulation mode to try.
2063 * If one is found, set up the new "search" table. */
2064 if (is_legacy(tbl->lq_type))
2065 rs_move_legacy_other(mvm, lq_sta, sta, index);
2066 else if (is_siso(tbl->lq_type))
2067 rs_move_siso_to_other(mvm, lq_sta, sta, index);
2068 else if (is_mimo2(tbl->lq_type))
2069 rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2070 else
d972ab31 2071 WARN_ON_ONCE(1);
8ca151b5
JB		 2072
2073 /* If new "search" mode was selected, set up in uCode table */
2074 if (lq_sta->search_better_tbl) {
2075 /* Access the "search" table, clear its history. */
2076 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2077 for (i = 0; i < IWL_RATE_COUNT; i++)
2078 rs_rate_scale_clear_window(&(tbl->win[i]));
2079
2080 /* Use new "search" start rate */
2081 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2082
2083 IWL_DEBUG_RATE(mvm,
4d30ee82
ES		 2084 "Switch to SEARCH TABLE: "
2085 "mcs %X (%s: %d)\n",
2086 tbl->current_rate,
2087 rs_pretty_lq_type(tbl->lq_type),
2088 index);
9145d151 2089 rs_fill_link_cmd(mvm, sta, lq_sta, tbl->current_rate);
9e680946 2090 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
8ca151b5
JB		 2091 } else {
2092 done_search = 1;
2093 }
2094 }
2095
2096 if (done_search && !lq_sta->stay_in_tbl) {
2097 /* If the "active" (non-search) mode was legacy,
2098 * and we've tried switching antennas,
2099 * but we haven't been able to try HT modes (not available),
2100 * stay with best antenna legacy modulation for a while
2101 * before next round of mode comparisons. */
2102 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2103 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2104 lq_sta->action_counter > tbl1->max_search) {
2105 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2106 rs_set_stay_in_table(mvm, 1, lq_sta);
2107 }
2108
2109 /* If we're in an HT mode, and all 3 mode switch actions
2110 * have been tried and compared, stay in this best modulation
2111 * mode for a while before next round of mode comparisons. */
2112 if (lq_sta->enable_counter &&
2113 (lq_sta->action_counter >= tbl1->max_search)) {
2114 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2115 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2116 (tid != IWL_MAX_TID_COUNT)) {
2117 tid_data = &sta_priv->tid_data[tid];
2118 if (tid_data->state == IWL_AGG_OFF) {
2119 IWL_DEBUG_RATE(mvm,
2120 "try to aggregate tid %d\n",
2121 tid);
2122 rs_tl_turn_on_agg(mvm, tid,
2123 lq_sta, sta);
2124 }
2125 }
2126 rs_set_stay_in_table(mvm, 0, lq_sta);
2127 }
2128 }
2129
2130out:
6a524f48 2131 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index);
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;
2156 int rate_idx;
2157 int i;
2158 u32 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]);
2175
2176 if ((i < 0) || (i >= IWL_RATE_COUNT))
2177 i = 0;
2178
2179 rate = iwl_rates[i].plcp;
2180 tbl->ant_type = first_antenna(valid_tx_ant);
2181 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2182
2183 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2184 rate |= RATE_MCS_CCK_MSK;
2185
2186 rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2187 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2188 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2189
6a524f48 2190 rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx);
8ca151b5
JB		 2191 tbl->current_rate = rate;
2192 rs_set_expected_tpt_table(lq_sta, tbl);
9145d151 2193 rs_fill_link_cmd(NULL, NULL, lq_sta, rate);
8ca151b5 2194 /* TODO restore station should remember the lq cmd */
b87c2179 2195 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
8ca151b5
JB		 2196}
2197
2198static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2199 struct ieee80211_tx_rate_control *txrc)
2200{
2201 struct sk_buff *skb = txrc->skb;
2202 struct ieee80211_supported_band *sband = txrc->sband;
2203 struct iwl_op_mode *op_mode __maybe_unused =
2204 (struct iwl_op_mode *)mvm_r;
2205 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2206 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2207 struct iwl_lq_sta *lq_sta = mvm_sta;
8ca151b5 2208
8ca151b5
JB		 2209 /* Get max rate if user set max rate */
2210 if (lq_sta) {
2211 lq_sta->max_rate_idx = txrc->max_rate_idx;
2212 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2213 (lq_sta->max_rate_idx != -1))
2214 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2215 if ((lq_sta->max_rate_idx < 0) ||
2216 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2217 lq_sta->max_rate_idx = -1;
2218 }
2219
2220 /* Treat uninitialized rate scaling data same as non-existing. */
2221 if (lq_sta && !lq_sta->drv) {
2222 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2223 mvm_sta = NULL;
2224 }
2225
2226 /* Send management frames and NO_ACK data using lowest rate. */
2227 if (rate_control_send_low(sta, mvm_sta, txrc))
2228 return;
2229
d310e405
ES		 2230 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2231 info->band, &info->control.rates[0]);
2232
622ebe99 2233 info->control.rates[0].count = 1;
8ca151b5
JB		 2234}
2235
2236static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2237 gfp_t gfp)
2238{
2239 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2240 struct iwl_op_mode *op_mode __maybe_unused =
2241 (struct iwl_op_mode *)mvm_rate;
2242 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2243
2244 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2245
2246 return &sta_priv->lq_sta;
2247}
2248
d310e405
ES		 2249static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2250 int nss)
2251{
2252 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2253 (0x3 << (2 * (nss - 1)));
2254 rx_mcs >>= (2 * (nss - 1));
2255
2256 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2257 return IWL_RATE_MCS_7_INDEX;
2258 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2259 return IWL_RATE_MCS_8_INDEX;
2260 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2261 return IWL_RATE_MCS_9_INDEX;
2262
2263 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2264 return -1;
2265}
2266
750a1b45
ES		 2267static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2268 struct ieee80211_sta_vht_cap *vht_cap,
2269 struct iwl_lq_sta *lq_sta)
2270{
2271 int i;
2272 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2273
2274 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2275 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2276 if (i == IWL_RATE_9M_INDEX)
2277 continue;
2278
271518ad
ES		 2279 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2280 if (i == IWL_RATE_MCS_9_INDEX &&
2281 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2282 continue;
2283
750a1b45
ES		 2284 lq_sta->active_siso_rate |= BIT(i);
2285 }
2286 }
2287
ecc90e79
ES		 2288 if (sta->rx_nss < 2)
2289 return;
2290
750a1b45
ES		 2291 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2292 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2293 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2294 if (i == IWL_RATE_9M_INDEX)
2295 continue;
2296
271518ad
ES		 2297 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2298 if (i == IWL_RATE_MCS_9_INDEX &&
2299 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2300 continue;
2301
750a1b45
ES		 2302 lq_sta->active_mimo2_rate |= BIT(i);
2303 }
2304 }
2305}
2306
8ca151b5
JB		 2307/*
2308 * Called after adding a new station to initialize rate scaling
2309 */
2310void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
b87c2179 2311 enum ieee80211_band band, bool init)
8ca151b5
JB		 2312{
2313 int i, j;
2314 struct ieee80211_hw *hw = mvm->hw;
2315 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
d310e405 2316 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
8ca151b5
JB		 2317 struct iwl_mvm_sta *sta_priv;
2318 struct iwl_lq_sta *lq_sta;
2319 struct ieee80211_supported_band *sband;
2320 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2321
2322 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2323 lq_sta = &sta_priv->lq_sta;
b87c2179
ES		 2324 memset(lq_sta, 0, sizeof(*lq_sta));
2325
8ca151b5
JB		 2326 sband = hw->wiphy->bands[band];
2327
2328 lq_sta->lq.sta_id = sta_priv->sta_id;
2329
2330 for (j = 0; j < LQ_SIZE; j++)
2331 for (i = 0; i < IWL_RATE_COUNT; i++)
2332 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2333
2334 lq_sta->flush_timer = 0;
2335 lq_sta->supp_rates = sta->supp_rates[sband->band];
8ca151b5
JB		 2336
2337 IWL_DEBUG_RATE(mvm,
2338 "LQ: *** rate scale station global init for station %d ***\n",
2339 sta_priv->sta_id);
2340 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2341 * the lowest or the highest rate.. Could consider using RSSI from
2342 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2343 * after assoc.. */
2344
2345 lq_sta->max_rate_idx = -1;
2346 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
8ca151b5
JB		 2347 lq_sta->band = sband->band;
2348 /*
2349 * active legacy rates as per supported rates bitmap
2350 */
2351 supp = sta->supp_rates[sband->band];
2352 lq_sta->active_legacy_rate = 0;
2353 for_each_set_bit(i, &supp, BITS_PER_LONG)
2354 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2355
d310e405
ES		 2356 /* TODO: should probably account for rx_highest for both HT/VHT */
2357 if (!vht_cap || !vht_cap->vht_supported) {
2358 /* active_siso_rate mask includes 9 MBits (bit 5),
2359 * and CCK (bits 0-3), supp_rates[] does not;
2360 * shift to convert format, force 9 MBits off.
2361 */
2362 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2363 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2364 lq_sta->active_siso_rate &= ~((u16)0x2);
2365 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2366
2367 /* Same here */
2368 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2369 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2370 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2371 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2372
2373 lq_sta->is_vht = false;
2374 } else {
750a1b45 2375 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
d310e405
ES		 2376 lq_sta->is_vht = true;
2377 }
8ca151b5 2378
8ca151b5 2379 IWL_DEBUG_RATE(mvm,
d310e405 2380 "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
8ca151b5 2381 lq_sta->active_siso_rate,
d310e405
ES		 2382 lq_sta->active_mimo2_rate,
2383 lq_sta->is_vht);
8ca151b5
JB		 2384
2385 /* These values will be overridden later */
2386 lq_sta->lq.single_stream_ant_msk =
ff402312 2387 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
8ca151b5 2388 lq_sta->lq.dual_stream_ant_msk =
ff402312
EG		 2389 iwl_fw_valid_tx_ant(mvm->fw) &
2390 ~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
8ca151b5
JB		 2391 if (!lq_sta->lq.dual_stream_ant_msk) {
2392 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
ff402312 2393 } else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
8ca151b5 2394 lq_sta->lq.dual_stream_ant_msk =
ff402312 2395 iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2396 }
2397
2398 /* as default allow aggregation for all tids */
2399 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2400 lq_sta->drv = mvm;
2401
2402 /* Set last_txrate_idx to lowest rate */
2403 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2404 if (sband->band == IEEE80211_BAND_5GHZ)
2405 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2406 lq_sta->is_agg = 0;
2407#ifdef CONFIG_MAC80211_DEBUGFS
2408 lq_sta->dbg_fixed_rate = 0;
2409#endif
2410
b87c2179
ES		 2411 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2412}
2413
2414static void rs_rate_update(void *mvm_r,
2415 struct ieee80211_supported_band *sband,
2416 struct cfg80211_chan_def *chandef,
2417 struct ieee80211_sta *sta, void *priv_sta,
2418 u32 changed)
2419{
2420 u8 tid;
2421 struct iwl_op_mode *op_mode =
2422 (struct iwl_op_mode *)mvm_r;
2423 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2424
2425 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2426 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2427 ieee80211_stop_tx_ba_session(sta, tid);
2428
2429 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
8ca151b5
JB		 2430}
2431
2432static void rs_fill_link_cmd(struct iwl_mvm *mvm,
9145d151 2433 struct ieee80211_sta *sta,
8ca151b5
JB		 2434 struct iwl_lq_sta *lq_sta, u32 new_rate)
2435{
2436 struct iwl_scale_tbl_info tbl_type;
2437 int index = 0;
2438 int rate_idx;
2439 int repeat_rate = 0;
2440 u8 ant_toggle_cnt = 0;
2441 u8 use_ht_possible = 1;
2442 u8 valid_tx_ant = 0;
2443 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2444
2445 /* Override starting rate (index 0) if needed for debug purposes */
3571ac33 2446 rs_dbgfs_set_mcs(lq_sta, &new_rate);
8ca151b5
JB		 2447
2448 /* Interpret new_rate (rate_n_flags) */
2449 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2450 &tbl_type, &rate_idx);
2451
2452 /* How many times should we repeat the initial rate? */
2453 if (is_legacy(tbl_type.lq_type)) {
2454 ant_toggle_cnt = 1;
2455 repeat_rate = IWL_NUMBER_TRY;
2456 } else {
2457 repeat_rate = min(IWL_HT_NUMBER_TRY,
2458 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2459 }
2460
2461 lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2462
2463 /* Fill 1st table entry (index 0) */
2464 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2465
2466 if (num_of_ant(tbl_type.ant_type) == 1)
2467 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2468 else if (num_of_ant(tbl_type.ant_type) == 2)
2469 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2470 /* otherwise we don't modify the existing value */
2471
2472 index++;
2473 repeat_rate--;
2474 if (mvm)
ff402312 2475 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2476
2477 /* Fill rest of rate table */
2478 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2479 /* Repeat initial/next rate.
2480 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2481 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2482 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2483 if (is_legacy(tbl_type.lq_type)) {
2484 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2485 ant_toggle_cnt++;
2486 else if (mvm &&
2487 rs_toggle_antenna(valid_tx_ant,
2488 &new_rate, &tbl_type))
2489 ant_toggle_cnt = 1;
2490 }
2491
2492 /* Override next rate if needed for debug purposes */
3571ac33 2493 rs_dbgfs_set_mcs(lq_sta, &new_rate);
8ca151b5
JB		 2494
2495 /* Fill next table entry */
2496 lq_cmd->rs_table[index] =
2497 cpu_to_le32(new_rate);
2498 repeat_rate--;
2499 index++;
2500 }
2501
2502 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2503 &rate_idx);
2504
8ca151b5
JB		 2505 /* Indicate to uCode which entries might be MIMO.
2506 * If initial rate was MIMO, this will finally end up
2507 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2508 if (is_mimo(tbl_type.lq_type))
2509 lq_cmd->mimo_delim = index;
2510
2511 /* Get next rate */
2512 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2513 use_ht_possible);
2514
2515 /* How many times should we repeat the next rate? */
2516 if (is_legacy(tbl_type.lq_type)) {
2517 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2518 ant_toggle_cnt++;
2519 else if (mvm &&
2520 rs_toggle_antenna(valid_tx_ant,
2521 &new_rate, &tbl_type))
2522 ant_toggle_cnt = 1;
2523
2524 repeat_rate = IWL_NUMBER_TRY;
2525 } else {
2526 repeat_rate = IWL_HT_NUMBER_TRY;
2527 }
2528
2529 /* Don't allow HT rates after next pass.
d310e405
ES		 2530 * rs_get_lower_rate() will change type to LQ_LEGACY_A
2531 * or LQ_LEGACY_G.
2532 */
8ca151b5
JB		 2533 use_ht_possible = 0;
2534
2535 /* Override next rate if needed for debug purposes */
3571ac33 2536 rs_dbgfs_set_mcs(lq_sta, &new_rate);
8ca151b5
JB		 2537
2538 /* Fill next table entry */
2539 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2540
2541 index++;
2542 repeat_rate--;
2543 }
2544
2545 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2546 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2547
2548 lq_cmd->agg_time_limit =
2549 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
e96d551f 2550
9145d151
EG		 2551 if (sta)
2552 lq_cmd->agg_time_limit =
2553 cpu_to_le16(iwl_mvm_bt_coex_agg_time_limit(mvm, sta));
8ca151b5
JB		 2554}
2555
2556static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2557{
2558 return hw->priv;
2559}
2560/* rate scale requires free function to be implemented */
2561static void rs_free(void *mvm_rate)
2562{
2563 return;
2564}
2565
2566static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2567 void *mvm_sta)
2568{
2569 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2570 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2571
2572 IWL_DEBUG_RATE(mvm, "enter\n");
2573 IWL_DEBUG_RATE(mvm, "leave\n");
2574}
2575
2576#ifdef CONFIG_MAC80211_DEBUGFS
2577static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3571ac33 2578 u32 *rate_n_flags)
8ca151b5
JB		 2579{
2580 struct iwl_mvm *mvm;
2581 u8 valid_tx_ant;
2582 u8 ant_sel_tx;
2583
2584 mvm = lq_sta->drv;
ff402312 2585 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
8ca151b5
JB		 2586 if (lq_sta->dbg_fixed_rate) {
2587 ant_sel_tx =
2588 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2589 >> RATE_MCS_ANT_POS);
2590 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2591 *rate_n_flags = lq_sta->dbg_fixed_rate;
8ca151b5
JB		 2592 } else {
2593 lq_sta->dbg_fixed_rate = 0;
2594 IWL_ERR(mvm,
2595 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2596 ant_sel_tx, valid_tx_ant);
2597 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2598 }
8ca151b5
JB		 2599 }
2600}
2601
2602static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2603 const char __user *user_buf, size_t count, loff_t *ppos)
2604{
2605 struct iwl_lq_sta *lq_sta = file->private_data;
2606 struct iwl_mvm *mvm;
2607 char buf[64];
2608 size_t buf_size;
2609 u32 parsed_rate;
2610
2611
2612 mvm = lq_sta->drv;
2613 memset(buf, 0, sizeof(buf));
2614 buf_size = min(count, sizeof(buf) - 1);
2615 if (copy_from_user(buf, user_buf, buf_size))
2616 return -EFAULT;
2617
2618 if (sscanf(buf, "%x", &parsed_rate) == 1)
2619 lq_sta->dbg_fixed_rate = parsed_rate;
2620 else
2621 lq_sta->dbg_fixed_rate = 0;
2622
2623 rs_program_fix_rate(mvm, lq_sta);
2624
2625 return count;
2626}
2627
4d30ee82
ES		 2628static const char *rs_pretty_lq_type(enum iwl_table_type type)
2629{
2630 static const char * const lq_type[] = {
2631 [LQ_NONE] = "NONE",
2632 [LQ_LEGACY_A] = "LEGACY_A",
2633 [LQ_LEGACY_G] = "LEGACY_G",
2634 [LQ_HT_SISO] = "HT SISO",
2635 [LQ_HT_MIMO2] = "HT MIMO",
2636 [LQ_VHT_SISO] = "VHT SISO",
2637 [LQ_VHT_MIMO2] = "VHT MIMO",
2638 };
2639
2640 if (type < LQ_NONE || type >= LQ_MAX)
2641 return "UNKNOWN";
2642
2643 return lq_type[type];
2644}
2645
1a61b347
ES		 2646static int rs_pretty_print_rate(char *buf, const u32 rate)
2647{
2648 static const char * const ant_name[] = {
2649 [ANT_NONE] = "None",
2650 [ANT_A] = "A",
2651 [ANT_B] = "B",
2652 [ANT_AB] = "AB",
2653 [ANT_C] = "C",
2654 [ANT_AC] = "AC",
2655 [ANT_BC] = "BC",
2656 [ANT_ABC] = "ABC",
2657 };
2658
2659 char *type, *bw;
2660 u8 mcs = 0, nss = 0;
2661 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2662
2663 if (!(rate & RATE_MCS_HT_MSK) &&
2664 !(rate & RATE_MCS_VHT_MSK)) {
2665 int index = iwl_hwrate_to_plcp_idx(rate);
2666
2667 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2668 ant_name[ant], iwl_rate_mcs[index].mbps);
2669 }
2670
2671 if (rate & RATE_MCS_VHT_MSK) {
2672 type = "VHT";
2673 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2674 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2675 >> RATE_VHT_MCS_NSS_POS) + 1;
2676 } else if (rate & RATE_MCS_HT_MSK) {
2677 type = "HT";
2678 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2679 } else {
2680 type = "Unknown"; /* shouldn't happen */
2681 }
2682
2683 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2684 case RATE_MCS_CHAN_WIDTH_20:
2685 bw = "20Mhz";
2686 break;
2687 case RATE_MCS_CHAN_WIDTH_40:
2688 bw = "40Mhz";
2689 break;
2690 case RATE_MCS_CHAN_WIDTH_80:
2691 bw = "80Mhz";
2692 break;
2693 case RATE_MCS_CHAN_WIDTH_160:
2694 bw = "160Mhz";
2695 break;
2696 default:
2697 bw = "BAD BW";
2698 }
2699
2700 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2701 type, ant_name[ant], bw, mcs, nss,
2702 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2703 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
2704 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2705 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2706 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2707}
2708
8ca151b5
JB		 2709static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2710 char __user *user_buf, size_t count, loff_t *ppos)
2711{
2712 char *buff;
2713 int desc = 0;
2714 int i = 0;
8ca151b5
JB		 2715 ssize_t ret;
2716
2717 struct iwl_lq_sta *lq_sta = file->private_data;
2718 struct iwl_mvm *mvm;
2719 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2720
2721 mvm = lq_sta->drv;
1a61b347 2722 buff = kmalloc(2048, GFP_KERNEL);
8ca151b5
JB		 2723 if (!buff)
2724 return -ENOMEM;
2725
2726 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2727 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2728 lq_sta->total_failed, lq_sta->total_success,
2729 lq_sta->active_legacy_rate);
2730 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2731 lq_sta->dbg_fixed_rate);
2732 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
ff402312
EG		 2733 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2734 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2735 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
8ca151b5 2736 desc += sprintf(buff+desc, "lq type %s\n",
d310e405
ES		 2737 (is_legacy(tbl->lq_type)) ? "legacy" :
2738 is_vht(tbl->lq_type) ? "VHT" : "HT");
1a61b347 2739 if (!is_legacy(tbl->lq_type)) {
8ca151b5 2740 desc += sprintf(buff+desc, " %s",
d972ab31 2741 (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
8ca151b5 2742 desc += sprintf(buff+desc, " %s",
d310e405
ES		 2743 (is_ht20(tbl)) ? "20MHz" :
2744 (is_ht40(tbl)) ? "40MHz" :
2745 (is_ht80(tbl)) ? "80Mhz" : "BAD BW");
6a524f48 2746 desc += sprintf(buff+desc, " %s %s\n",
1a61b347 2747 (tbl->is_SGI) ? "SGI" : "NGI",
6a524f48 2748 (lq_sta->is_agg) ? "AGG on" : "");
8ca151b5
JB		 2749 }
2750 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2751 lq_sta->last_rate_n_flags);
2752 desc += sprintf(buff+desc,
1a61b347 2753 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
8ca151b5
JB		 2754 lq_sta->lq.flags,
2755 lq_sta->lq.mimo_delim,
2756 lq_sta->lq.single_stream_ant_msk,
2757 lq_sta->lq.dual_stream_ant_msk);
2758
2759 desc += sprintf(buff+desc,
2760 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2761 le16_to_cpu(lq_sta->lq.agg_time_limit),
2762 lq_sta->lq.agg_disable_start_th,
2763 lq_sta->lq.agg_frame_cnt_limit);
2764
2765 desc += sprintf(buff+desc,
2766 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2767 lq_sta->lq.initial_rate_index[0],
2768 lq_sta->lq.initial_rate_index[1],
2769 lq_sta->lq.initial_rate_index[2],
2770 lq_sta->lq.initial_rate_index[3]);
2771
2772 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
1a61b347
ES		 2773 u32 rate = le32_to_cpu(lq_sta->lq.rs_table[i]);
2774 desc += sprintf(buff+desc,
2775 " rate[%d] 0x%X ",
2776 i, rate);
2777
2778 desc += rs_pretty_print_rate(buff+desc, rate);
8ca151b5
JB		 2779 }
2780
2781 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2782 kfree(buff);
2783 return ret;
2784}
2785
2786static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2787 .write = rs_sta_dbgfs_scale_table_write,
2788 .read = rs_sta_dbgfs_scale_table_read,
2789 .open = simple_open,
2790 .llseek = default_llseek,
2791};
2792static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2793 char __user *user_buf, size_t count, loff_t *ppos)
2794{
2795 char *buff;
2796 int desc = 0;
2797 int i, j;
2798 ssize_t ret;
d310e405 2799 struct iwl_scale_tbl_info *tbl;
8ca151b5
JB		 2800 struct iwl_lq_sta *lq_sta = file->private_data;
2801
2802 buff = kmalloc(1024, GFP_KERNEL);
2803 if (!buff)
2804 return -ENOMEM;
2805
2806 for (i = 0; i < LQ_SIZE; i++) {
d310e405 2807 tbl = &(lq_sta->lq_info[i]);
8ca151b5 2808 desc += sprintf(buff+desc,
6a524f48 2809 "%s type=%d SGI=%d BW=%s DUP=0\n"
8ca151b5
JB		 2810 "rate=0x%X\n",
2811 lq_sta->active_tbl == i ? "*" : "x",
d310e405
ES		 2812 tbl->lq_type,
2813 tbl->is_SGI,
2814 is_ht20(tbl) ? "20Mhz" :
2815 is_ht40(tbl) ? "40Mhz" :
2816 is_ht80(tbl) ? "80Mhz" : "ERR",
d310e405 2817 tbl->current_rate);
8ca151b5
JB		 2818 for (j = 0; j < IWL_RATE_COUNT; j++) {
2819 desc += sprintf(buff+desc,
2820 "counter=%d success=%d %%=%d\n",
d310e405
ES		 2821 tbl->win[j].counter,
2822 tbl->win[j].success_counter,
2823 tbl->win[j].success_ratio);
8ca151b5
JB		 2824 }
2825 }
2826 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2827 kfree(buff);
2828 return ret;
2829}
2830
2831static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2832 .read = rs_sta_dbgfs_stats_table_read,
2833 .open = simple_open,
2834 .llseek = default_llseek,
2835};
2836
8ca151b5
JB		 2837static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2838{
2839 struct iwl_lq_sta *lq_sta = mvm_sta;
2840 lq_sta->rs_sta_dbgfs_scale_table_file =
2841 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2842 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2843 lq_sta->rs_sta_dbgfs_stats_table_file =
2844 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2845 lq_sta, &rs_sta_dbgfs_stats_table_ops);
8ca151b5
JB		 2846 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2847 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2848 &lq_sta->tx_agg_tid_en);
2849}
2850
2851static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2852{
2853 struct iwl_lq_sta *lq_sta = mvm_sta;
2854 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2855 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
8ca151b5
JB		 2856 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2857}
2858#endif
2859
2860/*
2861 * Initialization of rate scaling information is done by driver after
2862 * the station is added. Since mac80211 calls this function before a
2863 * station is added we ignore it.
2864 */
2865static void rs_rate_init_stub(void *mvm_r,
3de805cf
SW		 2866 struct ieee80211_supported_band *sband,
2867 struct cfg80211_chan_def *chandef,
2868 struct ieee80211_sta *sta, void *mvm_sta)
8ca151b5
JB		 2869{
2870}
2871static struct rate_control_ops rs_mvm_ops = {
2872 .module = NULL,
2873 .name = RS_NAME,
2874 .tx_status = rs_tx_status,
2875 .get_rate = rs_get_rate,
2876 .rate_init = rs_rate_init_stub,
2877 .alloc = rs_alloc,
2878 .free = rs_free,
2879 .alloc_sta = rs_alloc_sta,
2880 .free_sta = rs_free_sta,
b87c2179 2881 .rate_update = rs_rate_update,
8ca151b5
JB		 2882#ifdef CONFIG_MAC80211_DEBUGFS
2883 .add_sta_debugfs = rs_add_debugfs,
2884 .remove_sta_debugfs = rs_remove_debugfs,
2885#endif
2886};
2887
2888int iwl_mvm_rate_control_register(void)
2889{
2890 return ieee80211_rate_control_register(&rs_mvm_ops);
2891}
2892
2893void iwl_mvm_rate_control_unregister(void)
2894{
2895 ieee80211_rate_control_unregister(&rs_mvm_ops);
2896}
9ee718aa
EL		 2897
2898/**
2899 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2900 * Tx protection, according to this rquest and previous requests,
2901 * and send the LQ command.
9ee718aa
EL		 2902 * @mvmsta: The station
2903 * @enable: Enable Tx protection?
2904 */
e126b5d9
JB		 2905int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2906 bool enable)
9ee718aa 2907{
e126b5d9
JB		 2908 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2909
9ee718aa
EL		 2910 lockdep_assert_held(&mvm->mutex);
2911
2912 if (enable) {
2913 if (mvmsta->tx_protection == 0)
d307ec8d 2914 lq->flags |= LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 2915 mvmsta->tx_protection++;
2916 } else {
2917 mvmsta->tx_protection--;
2918 if (mvmsta->tx_protection == 0)
d307ec8d 2919 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
9ee718aa
EL		 2920 }
2921
9e680946 2922 return iwl_mvm_send_lq_cmd(mvm, lq, false);
9ee718aa 2923}
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