1 /******************************************************************************
3 * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
21 * Contact Information:
22 * Intel Linux Wireless <ilw@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/slab.h>
30 #include <net/mac80211.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
36 #include <linux/workqueue.h>
40 #include "iwl-op-mode.h"
43 #define RS_NAME "iwl-mvm-rs"
45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 3 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
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)
58 static u8 rs_ht_to_legacy[] = {
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,
74 static const u8 ant_toggle_lookup[] = {
75 [ANT_NONE] = ANT_NONE,
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, \
92 IWL_RATE_##rn##M_INDEX }
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 }
105 * rate, ht rate, prev rate, next rate
107 * If there isn't a valid next or previous rate then INV is used which
108 * maps to IWL_RATE_INVALID
111 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
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 */
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 */
129 static inline u8 rs_extract_rate(u32 rate_n_flags)
131 /* also works for HT because bits 7:6 are zero there */
132 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
135 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
139 if (rate_n_flags & RATE_MCS_HT_MSK) {
140 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
141 idx += IWL_RATE_MCS_0_INDEX;
143 /* skip 9M not supported in HT*/
144 if (idx >= IWL_RATE_9M_INDEX)
146 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
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;
152 /* skip 9M not supported in VHT*/
153 if (idx >= IWL_RATE_9M_INDEX)
155 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
158 /* legacy rate format, search for match in table */
160 u8 legacy_rate = rs_extract_rate(rate_n_flags);
161 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
162 if (iwl_rates[idx].plcp == legacy_rate)
169 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
171 struct ieee80211_sta *sta,
172 struct iwl_lq_sta *lq_sta);
173 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
174 struct ieee80211_sta *sta,
175 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
176 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
177 static const char *rs_pretty_lq_type(enum iwl_table_type type);
179 #ifdef CONFIG_MAC80211_DEBUGFS
180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
183 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
189 * The following tables contain the expected throughput metrics for all rates
191 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
193 * where invalid entries are zeros.
195 * CCK rates are only valid in legacy table and will only be used in G
199 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
200 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
203 /* Expected TpT tables. 4 indexes:
204 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
206 static 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},
213 static 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},
220 static 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},
227 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
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},
234 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
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},
241 static 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},
249 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
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"},
265 #define MCS_INDEX_PER_STREAM (8)
267 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
270 window->success_counter = 0;
271 window->success_ratio = IWL_INVALID_VALUE;
273 window->average_tpt = IWL_INVALID_VALUE;
277 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
279 return (ant_type & valid_antenna) == ant_type;
282 #ifdef CONFIG_MAC80211_DEBUGFS
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.
289 static void rs_program_fix_rate(struct iwl_mvm *mvm,
290 struct iwl_lq_sta *lq_sta)
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 */
296 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
297 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
299 if (lq_sta->dbg_fixed_rate) {
300 rs_fill_link_cmd(NULL, NULL, lq_sta, lq_sta->dbg_fixed_rate);
301 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
306 static 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)
312 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
314 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
315 if (ret == -EAGAIN) {
317 * driver and mac80211 is out of sync
318 * this might be cause by reloading firmware
319 * stop the tx ba session here
321 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
323 ieee80211_stop_tx_ba_session(sta, tid);
328 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
329 struct iwl_lq_sta *lq_data,
330 struct ieee80211_sta *sta)
332 if (tid < IWL_MAX_TID_COUNT)
333 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
335 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
336 tid, IWL_MAX_TID_COUNT);
339 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
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);
347 * Static function to get the expected throughput from an iwl_scale_tbl_info
348 * that wraps a NULL pointer check
350 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
352 if (tbl->expected_tpt)
353 return tbl->expected_tpt[rs_index];
358 * rs_collect_tx_data - Update the success/failure sliding window
360 * We keep a sliding window of the last 62 packets transmitted
361 * at this rate. window->data contains the bitmask of successful
364 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
365 int scale_index, int attempts, int successes)
367 struct iwl_rate_scale_data *window = NULL;
368 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
371 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
374 /* Select window for current tx bit rate */
375 window = &(tbl->win[scale_index]);
377 /* Get expected throughput */
378 tpt = get_expected_tpt(tbl, scale_index);
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!).
388 while (attempts > 0) {
389 if (window->counter >= IWL_RATE_MAX_WINDOW) {
390 /* remove earliest */
391 window->counter = IWL_RATE_MAX_WINDOW - 1;
393 if (window->data & mask) {
394 window->data &= ~mask;
395 window->success_counter--;
399 /* Increment frames-attempted counter */
402 /* Shift bitmap by one frame to throw away oldest history */
405 /* Mark the most recent #successes attempts as successful */
407 window->success_counter++;
415 /* Calculate current success ratio, avoid divide-by-0! */
416 if (window->counter > 0)
417 window->success_ratio = 128 * (100 * window->success_counter)
420 window->success_ratio = IWL_INVALID_VALUE;
422 fail_count = window->counter - window->success_counter;
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;
429 window->average_tpt = IWL_INVALID_VALUE;
431 /* Tag this window as having been updated */
432 window->stamp = jiffies;
438 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
440 /* FIXME:RS:remove this function and put the flags statically in the table */
441 static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm,
442 struct iwl_scale_tbl_info *tbl, int index)
444 u32 rate_n_flags = 0;
446 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
447 RATE_MCS_ANT_ABC_MSK);
449 if (is_legacy(tbl->lq_type)) {
450 rate_n_flags |= iwl_rates[index].plcp;
451 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
452 rate_n_flags |= RATE_MCS_CCK_MSK;
456 if (is_ht(tbl->lq_type)) {
457 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
458 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
459 index = IWL_LAST_HT_RATE;
461 rate_n_flags |= RATE_MCS_HT_MSK;
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;
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;
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;
483 IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type);
486 rate_n_flags |= tbl->bw;
488 rate_n_flags |= RATE_MCS_SGI_MSK;
494 * Interpret uCode API's rate_n_flags format,
495 * fill "search" or "active" tx mode table.
497 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
498 enum ieee80211_band band,
499 struct iwl_scale_tbl_info *tbl,
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);
506 memset(tbl, 0, offsetof(struct iwl_scale_tbl_info, win));
507 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
509 if (*rate_idx == IWL_RATE_INVALID) {
513 tbl->is_SGI = 0; /* default legacy setup */
515 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
516 tbl->lq_type = LQ_NONE;
517 tbl->max_search = IWL_MAX_SEARCH;
520 if (!(rate_n_flags & RATE_MCS_HT_MSK) &&
521 !(rate_n_flags & RATE_MCS_VHT_MSK)) {
522 if (num_of_ant == 1) {
523 if (band == IEEE80211_BAND_5GHZ)
524 tbl->lq_type = LQ_LEGACY_A;
526 tbl->lq_type = LQ_LEGACY_G;
533 if (rate_n_flags & RATE_MCS_SGI_MSK)
536 tbl->bw = rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK;
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;
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);
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;
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);
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));
573 /* switch to another antenna/antennas and return 1 */
574 /* if no other valid antenna found, return 0 */
575 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
576 struct iwl_scale_tbl_info *tbl)
580 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
583 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
586 new_ant_type = ant_toggle_lookup[tbl->ant_type];
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];
592 if (new_ant_type == tbl->ant_type)
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;
602 * rs_get_supported_rates - get the available rates
604 * if management frame or broadcast frame only return
605 * basic available rates.
608 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
609 struct ieee80211_hdr *hdr,
610 enum iwl_table_type rate_type)
612 if (is_legacy(rate_type))
613 return lq_sta->active_legacy_rate;
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;
623 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
626 u8 high = IWL_RATE_INVALID;
627 u8 low = IWL_RATE_INVALID;
629 /* 802.11A or ht walks to the next literal adjacent rate in
631 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
635 /* Find the previous rate that is in the rate mask */
637 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
638 if (rate_mask & mask) {
644 /* Find the next rate that is in the rate mask */
646 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
647 if (rate_mask & mask) {
653 return (high << 8) | low;
657 while (low != IWL_RATE_INVALID) {
658 low = iwl_rates[low].prev_rs;
659 if (low == IWL_RATE_INVALID)
661 if (rate_mask & (1 << low))
663 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
667 while (high != IWL_RATE_INVALID) {
668 high = iwl_rates[high].next_rs;
669 if (high == IWL_RATE_INVALID)
671 if (rate_mask & (1 << high))
673 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
676 return (high << 8) | low;
679 static 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)
686 u8 switch_to_legacy = 0;
687 struct iwl_mvm *mvm = lq_sta->drv;
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)
696 tbl->lq_type = LQ_LEGACY_A;
698 tbl->lq_type = LQ_LEGACY_G;
700 if (num_of_ant(tbl->ant_type) > 1)
702 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
706 tbl->max_search = IWL_MAX_SEARCH;
709 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
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));
718 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
721 /* If we switched from HT to legacy, check current rate */
722 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
727 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
729 low = high_low & 0xff;
731 if (low == IWL_RATE_INVALID)
735 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low);
739 * Simple function to compare two rate scale table types
741 static bool table_type_matches(struct iwl_scale_tbl_info *a,
742 struct iwl_scale_tbl_info *b)
744 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
745 (a->is_SGI == b->is_SGI);
748 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
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;
757 return RATE_MCS_CHAN_WIDTH_20;
761 * mac80211 sends us Tx status
763 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
764 struct ieee80211_sta *sta, void *priv_sta,
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;
778 struct iwl_scale_tbl_info tbl_type;
779 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
781 /* Treat uninitialized rate scaling data same as non-existing. */
783 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
785 } else if (!lq_sta->drv) {
786 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
790 if (!ieee80211_is_data(hdr->frame_control) ||
791 info->flags & IEEE80211_TX_CTL_NO_ACK)
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))
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).
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))
821 * mac80211 HT index is always zero-indexed; we need to move
822 * HT OFDM rates after CCK rates in 2.4 GHz band
824 if (info->band == IEEE80211_BAND_2GHZ)
825 mac_index += IWL_FIRST_OFDM_RATE;
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))
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)) ||
835 (tbl_type.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
836 (tbl_type.ant_type != info->status.antenna) ||
837 (!!(tx_rate & RATE_MCS_HT_MSK) !=
838 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
839 (!!(tx_rate & RATE_MCS_VHT_MSK) !=
840 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
841 (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
842 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
843 (rs_index != mac_index)) {
845 "initial rate %d does not match %d (0x%x)\n",
846 mac_index, rs_index, tx_rate);
848 * Since rates mis-match, the last LQ command may have failed.
849 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
852 lq_sta->missed_rate_counter++;
853 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
854 lq_sta->missed_rate_counter = 0;
855 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
857 /* Regardless, ignore this status info for outdated rate */
860 /* Rate did match, so reset the missed_rate_counter */
861 lq_sta->missed_rate_counter = 0;
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]);
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,
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,
883 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
884 tbl_type.lq_type, tbl_type.ant_type,
887 * no matching table found, let's by-pass the data collection
888 * and continue to perform rate scale to find the rate table
890 rs_stay_in_table(lq_sta, true);
895 * Updating the frame history depends on whether packets were
898 * For aggregation, all packets were transmitted at the same rate, the
899 * first index into rate scale table.
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,
905 rs_collect_tx_data(curr_tbl, rs_index,
906 info->status.ampdu_len,
907 info->status.ampdu_ack_len);
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);
917 * For legacy, update frame history with for each Tx retry.
919 retries = info->status.rates[0].count - 1;
920 /* HW doesn't send more than 15 retries */
921 retries = min(retries, 15);
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);
931 * Only collect stats if retried rate is in the same RS
932 * table as active/search.
934 if (table_type_matches(&tbl_type, curr_tbl))
936 else if (table_type_matches(&tbl_type, other_tbl))
940 rs_collect_tx_data(tmp_tbl, rs_index, 1,
941 i < retries ? 0 : legacy_success);
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);
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;
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);
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.
966 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
967 struct iwl_lq_sta *lq_sta)
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 */
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;
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;
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;
988 * Find correct throughput table for given mode of modulation
990 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
991 struct iwl_scale_tbl_info *tbl)
993 /* Used to choose among HT tables */
994 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
996 /* Check for invalid LQ type */
997 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_ht(tbl->lq_type) &&
998 !(is_vht(tbl->lq_type)))) {
999 tbl->expected_tpt = expected_tpt_legacy;
1003 /* Legacy rates have only one table */
1004 if (is_legacy(tbl->lq_type)) {
1005 tbl->expected_tpt = expected_tpt_legacy;
1009 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1010 /* Choose among many HT tables depending on number of streams
1011 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1013 if (is_siso(tbl->lq_type)) {
1015 case RATE_MCS_CHAN_WIDTH_20:
1016 ht_tbl_pointer = expected_tpt_siso_20MHz;
1018 case RATE_MCS_CHAN_WIDTH_40:
1019 ht_tbl_pointer = expected_tpt_siso_40MHz;
1021 case RATE_MCS_CHAN_WIDTH_80:
1022 ht_tbl_pointer = expected_tpt_siso_80MHz;
1027 } else if (is_mimo2(tbl->lq_type)) {
1029 case RATE_MCS_CHAN_WIDTH_20:
1030 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1032 case RATE_MCS_CHAN_WIDTH_40:
1033 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1035 case RATE_MCS_CHAN_WIDTH_80:
1036 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
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];
1052 tbl->expected_tpt = ht_tbl_pointer[3];
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.
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.
1067 static 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)
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];
1078 /* expected "search" throughput */
1079 s32 *tpt_tbl = tbl->expected_tpt;
1081 s32 new_rate, high, low, start_hi;
1085 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1088 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1091 low = high_low & 0xff;
1092 high = (high_low >> 8) & 0xff;
1095 * Lower the "search" bit rate, to give new "search" mode
1096 * approximately the same throughput as "active" if:
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).
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).
1109 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1110 ((active_sr > RS_SR_FORCE_DECREASE) &&
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;
1125 /* Loop again with lower rate */
1126 if (low != IWL_RATE_INVALID)
1129 /* Lower rate not available, use the original */
1133 /* Else try to raise the "search" rate to match "active" */
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)
1141 /* Loop again with higher rate */
1142 else if (high != IWL_RATE_INVALID) {
1146 /* Higher rate not available, use the original */
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.
1160 static inline void rs_move_next_action(struct iwl_scale_tbl_info *tbl,
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);
1167 tbl->action = (tbl->action + 1) % (last_action + 1);
1170 static void rs_set_bw_from_sta(struct iwl_scale_tbl_info *tbl,
1171 struct ieee80211_sta *sta)
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;
1178 tbl->bw = RATE_MCS_CHAN_WIDTH_20;
1181 static bool rs_sgi_allowed(struct iwl_scale_tbl_info *tbl,
1182 struct ieee80211_sta *sta)
1184 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1185 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
1187 if (is_ht20(tbl) && (ht_cap->cap &
1188 IEEE80211_HT_CAP_SGI_20))
1190 if (is_ht40(tbl) && (ht_cap->cap &
1191 IEEE80211_HT_CAP_SGI_40))
1193 if (is_ht80(tbl) && (vht_cap->cap &
1194 IEEE80211_VHT_CAP_SHORT_GI_80))
1201 * Set up search table for MIMO2
1203 static 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)
1211 if (!sta->ht_cap.ht_supported)
1214 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1217 /* Need both Tx chains/antennas to support MIMO */
1218 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
1221 IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1223 tbl->lq_type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1225 tbl->max_search = IWL_MAX_SEARCH;
1226 rate_mask = lq_sta->active_mimo2_rate;
1228 rs_set_bw_from_sta(tbl, sta);
1229 rs_set_expected_tpt_table(lq_sta, tbl);
1231 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1233 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
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",
1240 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate);
1242 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index\n",
1248 * Set up search table for SISO
1250 static 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)
1258 if (!sta->ht_cap.ht_supported)
1261 IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1263 tbl->lq_type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1265 tbl->max_search = IWL_MAX_SEARCH;
1266 rate_mask = lq_sta->active_siso_rate;
1268 rs_set_bw_from_sta(tbl, sta);
1269 rs_set_expected_tpt_table(lq_sta, tbl);
1270 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
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)) {
1275 "can not switch with index %d rate mask %x\n",
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",
1286 * Try to switch to new modulation mode from legacy
1288 static int rs_move_legacy_other(struct iwl_mvm *mvm,
1289 struct iwl_lq_sta *lq_sta,
1290 struct ieee80211_sta *sta,
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));
1300 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1301 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1303 u8 update_search_tbl_counter = 0;
1305 start_action = tbl->action;
1307 lq_sta->action_counter++;
1308 switch (tbl->action) {
1309 case IWL_LEGACY_SWITCH_ANTENNA:
1310 IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1312 if (tx_chains_num <= 1)
1315 /* Don't change antenna if success has been great */
1316 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1319 /* Set up search table to try other antenna */
1320 memcpy(search_tbl, tbl, sz);
1322 if (rs_toggle_antenna(valid_tx_ant,
1323 &search_tbl->current_rate,
1325 update_search_tbl_counter = 1;
1326 rs_set_expected_tpt_table(lq_sta, search_tbl);
1330 case IWL_LEGACY_SWITCH_SISO:
1331 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
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,
1339 lq_sta->action_counter = 0;
1344 case IWL_LEGACY_SWITCH_MIMO2:
1345 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1347 /* Set up search table to try MIMO */
1348 memcpy(search_tbl, tbl, sz);
1349 search_tbl->is_SGI = 0;
1351 search_tbl->ant_type = ANT_AB;
1353 if (!rs_is_valid_ant(valid_tx_ant,
1354 search_tbl->ant_type))
1357 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1360 lq_sta->action_counter = 0;
1367 rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
1369 if (tbl->action == start_action)
1372 search_tbl->lq_type = LQ_NONE;
1376 lq_sta->search_better_tbl = 1;
1377 rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
1378 if (update_search_tbl_counter)
1379 search_tbl->action = tbl->action;
1384 * Try to switch to new modulation mode from SISO
1386 static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1387 struct iwl_lq_sta *lq_sta,
1388 struct ieee80211_sta *sta, int index)
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]);
1394 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1395 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1397 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1398 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1399 u8 update_search_tbl_counter = 0;
1402 if (tbl->action == IWL_SISO_SWITCH_MIMO2 &&
1403 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1404 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1406 start_action = tbl->action;
1408 lq_sta->action_counter++;
1409 switch (tbl->action) {
1410 case IWL_SISO_SWITCH_ANTENNA:
1411 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
1412 if (tx_chains_num <= 1)
1415 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1416 BT_MBOX_MSG(&mvm->last_bt_notif, 3,
1420 memcpy(search_tbl, tbl, sz);
1421 if (rs_toggle_antenna(valid_tx_ant,
1422 &search_tbl->current_rate,
1424 update_search_tbl_counter = 1;
1428 case IWL_SISO_SWITCH_MIMO2:
1429 IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1430 memcpy(search_tbl, tbl, sz);
1431 search_tbl->is_SGI = 0;
1433 search_tbl->ant_type = ANT_AB;
1435 if (!rs_is_valid_ant(valid_tx_ant,
1436 search_tbl->ant_type))
1439 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1444 case IWL_SISO_SWITCH_GI:
1445 if (!rs_sgi_allowed(tbl, sta))
1448 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1450 memcpy(search_tbl, tbl, sz);
1451 search_tbl->is_SGI = !tbl->is_SGI;
1452 rs_set_expected_tpt_table(lq_sta, search_tbl);
1454 s32 tpt = lq_sta->last_tpt / 100;
1455 if (tpt >= search_tbl->expected_tpt[index])
1458 search_tbl->current_rate =
1459 rate_n_flags_from_tbl(mvm, search_tbl, index);
1460 update_search_tbl_counter = 1;
1465 rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
1467 if (tbl->action == start_action)
1470 search_tbl->lq_type = LQ_NONE;
1474 lq_sta->search_better_tbl = 1;
1475 rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
1476 if (update_search_tbl_counter)
1477 search_tbl->action = tbl->action;
1483 * Try to switch to new modulation mode from MIMO2
1485 static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1486 struct iwl_lq_sta *lq_sta,
1487 struct ieee80211_sta *sta, int index)
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)]);
1492 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1493 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1495 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1496 u8 update_search_tbl_counter = 0;
1499 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
1500 IWL_DEBUG_RATE(mvm, "BT COEX force switch to SISO A\n");
1501 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1504 start_action = tbl->action;
1506 lq_sta->action_counter++;
1507 switch (tbl->action) {
1508 case IWL_MIMO2_SWITCH_SISO_A:
1509 case IWL_MIMO2_SWITCH_SISO_B:
1510 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1512 /* Set up new search table for SISO */
1513 memcpy(search_tbl, tbl, sz);
1515 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1516 search_tbl->ant_type = ANT_A;
1517 else /* tbl->action == IWL_MIMO2_SWITCH_SISO_B */
1518 search_tbl->ant_type = ANT_B;
1520 if (!rs_is_valid_ant(valid_tx_ant,
1521 search_tbl->ant_type))
1524 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1531 case IWL_MIMO2_SWITCH_GI:
1532 if (!rs_sgi_allowed(tbl, sta))
1535 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
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);
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!
1548 s32 tpt = lq_sta->last_tpt / 100;
1549 if (tpt >= search_tbl->expected_tpt[index])
1552 search_tbl->current_rate =
1553 rate_n_flags_from_tbl(mvm, search_tbl, index);
1554 update_search_tbl_counter = 1;
1559 rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
1561 if (tbl->action == start_action)
1564 search_tbl->lq_type = LQ_NONE;
1567 lq_sta->search_better_tbl = 1;
1568 rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
1569 if (update_search_tbl_counter)
1570 search_tbl->action = tbl->action;
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)
1582 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1584 struct iwl_scale_tbl_info *tbl;
1587 int flush_interval_passed = 0;
1588 struct iwl_mvm *mvm;
1591 active_tbl = lq_sta->active_tbl;
1593 tbl = &(lq_sta->lq_info[active_tbl]);
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 =
1601 (unsigned long)(lq_sta->flush_timer +
1602 IWL_RATE_SCALE_FLUSH_INTVL));
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.
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))) {
1618 "LQ: stay is expired %d %d %d\n",
1619 lq_sta->total_failed,
1620 lq_sta->total_success,
1621 flush_interval_passed);
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;
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
1635 lq_sta->table_count++;
1636 if (lq_sta->table_count >=
1637 lq_sta->table_count_limit) {
1638 lq_sta->table_count = 0;
1641 "LQ: stay in table clear win\n");
1642 for (i = 0; i < IWL_RATE_COUNT; i++)
1643 rs_rate_scale_clear_window(
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]));
1659 * setup rate table in uCode
1661 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1662 struct ieee80211_sta *sta,
1663 struct iwl_lq_sta *lq_sta,
1664 struct iwl_scale_tbl_info *tbl,
1669 /* Update uCode's rate table. */
1670 rate = rate_n_flags_from_tbl(mvm, tbl, index);
1671 rs_fill_link_cmd(mvm, sta, lq_sta, rate);
1672 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1675 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1676 struct ieee80211_hdr *hdr)
1678 u8 tid = IWL_MAX_TID_COUNT;
1680 if (ieee80211_is_data_qos(hdr->frame_control)) {
1681 u8 *qc = ieee80211_get_qos_ctl(hdr);
1685 if (unlikely(tid > IWL_MAX_TID_COUNT))
1686 tid = IWL_MAX_TID_COUNT;
1692 * Do rate scaling and search for new modulation mode.
1694 static 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)
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;
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;
1710 s8 scale_action = 0;
1713 struct iwl_scale_tbl_info *tbl, *tbl1;
1714 u16 rate_scale_index_msk = 0;
1719 u8 tid = IWL_MAX_TID_COUNT;
1720 u8 prev_agg = lq_sta->is_agg;
1721 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1722 struct iwl_mvm_tid_data *tid_data;
1724 /* Send management frames and NO_ACK data using lowest rate. */
1725 /* TODO: this could probably be improved.. */
1726 if (!ieee80211_is_data(hdr->frame_control) ||
1727 info->flags & IEEE80211_TX_CTL_NO_ACK)
1730 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1732 tid = rs_get_tid(lq_sta, hdr);
1733 if ((tid != IWL_MAX_TID_COUNT) &&
1734 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1735 tid_data = &sta_priv->tid_data[tid];
1736 if (tid_data->state == IWL_AGG_OFF)
1745 * Select rate-scale / modulation-mode table to work with in
1746 * the rest of this function: "search" if searching for better
1747 * modulation mode, or "active" if doing rate scaling within a mode.
1749 if (!lq_sta->search_better_tbl)
1750 active_tbl = lq_sta->active_tbl;
1752 active_tbl = 1 - lq_sta->active_tbl;
1754 tbl = &(lq_sta->lq_info[active_tbl]);
1756 if (prev_agg != lq_sta->is_agg) {
1758 "Aggregation changed: prev %d current %d. Update expected TPT table\n",
1759 prev_agg, lq_sta->is_agg);
1760 rs_set_expected_tpt_table(lq_sta, tbl);
1763 /* current tx rate */
1764 index = lq_sta->last_txrate_idx;
1766 /* rates available for this association, and for modulation mode */
1767 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1769 /* mask with station rate restriction */
1770 if (is_legacy(tbl->lq_type)) {
1771 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1772 /* supp_rates has no CCK bits in A mode */
1773 rate_scale_index_msk = (u16) (rate_mask &
1774 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1776 rate_scale_index_msk = (u16) (rate_mask &
1777 lq_sta->supp_rates);
1780 rate_scale_index_msk = rate_mask;
1783 if (!rate_scale_index_msk)
1784 rate_scale_index_msk = rate_mask;
1786 if (!((1 << index) & rate_scale_index_msk)) {
1787 IWL_ERR(mvm, "Current Rate is not valid\n");
1788 if (lq_sta->search_better_tbl) {
1789 /* revert to active table if search table is not valid*/
1790 tbl->lq_type = LQ_NONE;
1791 lq_sta->search_better_tbl = 0;
1792 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1793 /* get "active" rate info */
1794 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1795 rs_update_rate_tbl(mvm, sta, lq_sta, tbl, index);
1800 /* Get expected throughput table and history window for current rate */
1801 if (!tbl->expected_tpt) {
1802 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1806 /* force user max rate if set by user */
1807 if ((lq_sta->max_rate_idx != -1) &&
1808 (lq_sta->max_rate_idx < index)) {
1809 index = lq_sta->max_rate_idx;
1811 window = &(tbl->win[index]);
1813 "Forcing user max rate %d\n",
1818 window = &(tbl->win[index]);
1821 * If there is not enough history to calculate actual average
1822 * throughput, keep analyzing results of more tx frames, without
1823 * changing rate or mode (bypass most of the rest of this function).
1824 * Set up new rate table in uCode only if old rate is not supported
1825 * in current association (use new rate found above).
1827 fail_count = window->counter - window->success_counter;
1828 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1829 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1831 "(%s: %d): Test Window: succ %d total %d\n",
1832 rs_pretty_lq_type(tbl->lq_type),
1833 index, window->success_counter, window->counter);
1835 /* Can't calculate this yet; not enough history */
1836 window->average_tpt = IWL_INVALID_VALUE;
1838 /* Should we stay with this modulation mode,
1839 * or search for a new one? */
1840 rs_stay_in_table(lq_sta, false);
1844 /* Else we have enough samples; calculate estimate of
1845 * actual average throughput */
1846 if (window->average_tpt != ((window->success_ratio *
1847 tbl->expected_tpt[index] + 64) / 128)) {
1848 window->average_tpt = ((window->success_ratio *
1849 tbl->expected_tpt[index] + 64) / 128);
1852 /* If we are searching for better modulation mode, check success. */
1853 if (lq_sta->search_better_tbl) {
1854 /* If good success, continue using the "search" mode;
1855 * no need to send new link quality command, since we're
1856 * continuing to use the setup that we've been trying. */
1857 if (window->average_tpt > lq_sta->last_tpt) {
1859 "SWITCHING TO NEW TABLE SR: %d "
1860 "cur-tpt %d old-tpt %d\n",
1861 window->success_ratio,
1862 window->average_tpt,
1865 if (!is_legacy(tbl->lq_type))
1866 lq_sta->enable_counter = 1;
1868 /* Swap tables; "search" becomes "active" */
1869 lq_sta->active_tbl = active_tbl;
1870 current_tpt = window->average_tpt;
1871 /* Else poor success; go back to mode in "active" table */
1874 "GOING BACK TO THE OLD TABLE: SR %d "
1875 "cur-tpt %d old-tpt %d\n",
1876 window->success_ratio,
1877 window->average_tpt,
1880 /* Nullify "search" table */
1881 tbl->lq_type = LQ_NONE;
1883 /* Revert to "active" table */
1884 active_tbl = lq_sta->active_tbl;
1885 tbl = &(lq_sta->lq_info[active_tbl]);
1887 /* Revert to "active" rate and throughput info */
1888 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1889 current_tpt = lq_sta->last_tpt;
1891 /* Need to set up a new rate table in uCode */
1895 /* Either way, we've made a decision; modulation mode
1896 * search is done, allow rate adjustment next time. */
1897 lq_sta->search_better_tbl = 0;
1898 done_search = 1; /* Don't switch modes below! */
1902 /* (Else) not in search of better modulation mode, try for better
1903 * starting rate, while staying in this mode. */
1904 high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
1906 low = high_low & 0xff;
1907 high = (high_low >> 8) & 0xff;
1909 /* If user set max rate, dont allow higher than user constrain */
1910 if ((lq_sta->max_rate_idx != -1) &&
1911 (lq_sta->max_rate_idx < high))
1912 high = IWL_RATE_INVALID;
1914 sr = window->success_ratio;
1916 /* Collect measured throughputs for current and adjacent rates */
1917 current_tpt = window->average_tpt;
1918 if (low != IWL_RATE_INVALID)
1919 low_tpt = tbl->win[low].average_tpt;
1920 if (high != IWL_RATE_INVALID)
1921 high_tpt = tbl->win[high].average_tpt;
1924 "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
1925 rs_pretty_lq_type(tbl->lq_type), index, current_tpt,
1926 sr, low, high, low_tpt, high_tpt);
1930 /* Too many failures, decrease rate */
1931 if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1933 "decrease rate because of low SR\n");
1935 /* No throughput measured yet for adjacent rates; try increase. */
1936 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1937 (high_tpt == IWL_INVALID_VALUE)) {
1938 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH) {
1940 "Good SR and no high rate measurement. "
1943 } else if (low != IWL_RATE_INVALID) {
1945 "Remain in current rate\n");
1950 /* Both adjacent throughputs are measured, but neither one has better
1951 * throughput; we're using the best rate, don't change it! */
1952 else if ((low_tpt != IWL_INVALID_VALUE) &&
1953 (high_tpt != IWL_INVALID_VALUE) &&
1954 (low_tpt < current_tpt) &&
1955 (high_tpt < current_tpt)) {
1957 "Both high and low are worse. "
1962 /* At least one adjacent rate's throughput is measured,
1963 * and may have better performance. */
1965 /* Higher adjacent rate's throughput is measured */
1966 if (high_tpt != IWL_INVALID_VALUE) {
1967 /* Higher rate has better throughput */
1968 if (high_tpt > current_tpt &&
1969 sr >= IWL_RATE_INCREASE_TH) {
1971 "Higher rate is better and good "
1972 "SR. Increate rate\n");
1976 "Higher rate isn't better OR "
1977 "no good SR. Maintain rate\n");
1981 /* Lower adjacent rate's throughput is measured */
1982 } else if (low_tpt != IWL_INVALID_VALUE) {
1983 /* Lower rate has better throughput */
1984 if (low_tpt > current_tpt) {
1986 "Lower rate is better. "
1989 } else if (sr >= IWL_RATE_INCREASE_TH) {
1991 "Lower rate isn't better and "
1992 "good SR. Increase rate\n");
1998 /* Sanity check; asked for decrease, but success rate or throughput
1999 * has been good at old rate. Don't change it. */
2000 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2001 ((sr > IWL_RATE_HIGH_TH) ||
2002 (current_tpt > (100 * tbl->expected_tpt[low])))) {
2004 "Sanity check failed. Maintain rate\n");
2008 /* Force a search in case BT doesn't like us being in MIMO */
2009 if (is_mimo(tbl->lq_type) &&
2010 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2012 "BT Coex forbids MIMO. Search for new config\n");
2013 rs_stay_in_table(lq_sta, true);
2017 switch (scale_action) {
2019 /* Decrease starting rate, update uCode's rate table */
2020 if (low != IWL_RATE_INVALID) {
2025 "At the bottom rate. Can't decrease\n");
2030 /* Increase starting rate, update uCode's rate table */
2031 if (high != IWL_RATE_INVALID) {
2036 "At the top rate. Can't increase\n");
2047 /* Replace uCode's rate table for the destination station. */
2049 rs_update_rate_tbl(mvm, sta, lq_sta, tbl, index);
2051 rs_stay_in_table(lq_sta, false);
2054 * Search for new modulation mode if we're:
2055 * 1) Not changing rates right now
2056 * 2) Not just finishing up a search
2057 * 3) Allowing a new search
2059 if (!update_lq && !done_search &&
2060 !lq_sta->stay_in_tbl && window->counter) {
2061 /* Save current throughput to compare with "search" throughput*/
2062 lq_sta->last_tpt = current_tpt;
2065 "Start Search: update_lq %d done_search %d stay_in_tbl %d win->counter %d\n",
2066 update_lq, done_search, lq_sta->stay_in_tbl,
2068 /* Select a new "search" modulation mode to try.
2069 * If one is found, set up the new "search" table. */
2070 if (is_legacy(tbl->lq_type))
2071 rs_move_legacy_other(mvm, lq_sta, sta, index);
2072 else if (is_siso(tbl->lq_type))
2073 rs_move_siso_to_other(mvm, lq_sta, sta, index);
2074 else if (is_mimo2(tbl->lq_type))
2075 rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2079 /* If new "search" mode was selected, set up in uCode table */
2080 if (lq_sta->search_better_tbl) {
2081 /* Access the "search" table, clear its history. */
2082 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2083 for (i = 0; i < IWL_RATE_COUNT; i++)
2084 rs_rate_scale_clear_window(&(tbl->win[i]));
2086 /* Use new "search" start rate */
2087 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2090 "Switch to SEARCH TABLE: "
2091 "mcs %X (%s: %d)\n",
2093 rs_pretty_lq_type(tbl->lq_type),
2095 rs_fill_link_cmd(mvm, sta, lq_sta, tbl->current_rate);
2096 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2102 if (done_search && !lq_sta->stay_in_tbl) {
2103 /* If the "active" (non-search) mode was legacy,
2104 * and we've tried switching antennas,
2105 * but we haven't been able to try HT modes (not available),
2106 * stay with best antenna legacy modulation for a while
2107 * before next round of mode comparisons. */
2108 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2109 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2110 lq_sta->action_counter > tbl1->max_search) {
2111 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2112 rs_set_stay_in_table(mvm, 1, lq_sta);
2115 /* If we're in an HT mode, and all 3 mode switch actions
2116 * have been tried and compared, stay in this best modulation
2117 * mode for a while before next round of mode comparisons. */
2118 if (lq_sta->enable_counter &&
2119 (lq_sta->action_counter >= tbl1->max_search)) {
2120 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2121 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2122 (tid != IWL_MAX_TID_COUNT)) {
2123 tid_data = &sta_priv->tid_data[tid];
2124 if (tid_data->state == IWL_AGG_OFF) {
2126 "try to aggregate tid %d\n",
2128 rs_tl_turn_on_agg(mvm, tid,
2132 rs_set_stay_in_table(mvm, 0, lq_sta);
2137 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index);
2138 lq_sta->last_txrate_idx = index;
2142 * rs_initialize_lq - Initialize a station's hardware rate table
2144 * The uCode's station table contains a table of fallback rates
2145 * for automatic fallback during transmission.
2147 * NOTE: This sets up a default set of values. These will be replaced later
2148 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2151 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2152 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2153 * which requires station table entry to exist).
2155 static void rs_initialize_lq(struct iwl_mvm *mvm,
2156 struct ieee80211_sta *sta,
2157 struct iwl_lq_sta *lq_sta,
2158 enum ieee80211_band band,
2161 struct iwl_scale_tbl_info *tbl;
2168 if (!sta || !lq_sta)
2171 i = lq_sta->last_txrate_idx;
2173 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2175 if (!lq_sta->search_better_tbl)
2176 active_tbl = lq_sta->active_tbl;
2178 active_tbl = 1 - lq_sta->active_tbl;
2180 tbl = &(lq_sta->lq_info[active_tbl]);
2182 if ((i < 0) || (i >= IWL_RATE_COUNT))
2185 rate = iwl_rates[i].plcp;
2186 tbl->ant_type = first_antenna(valid_tx_ant);
2187 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2189 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2190 rate |= RATE_MCS_CCK_MSK;
2192 rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2193 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2194 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2196 rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx);
2197 tbl->current_rate = rate;
2198 rs_set_expected_tpt_table(lq_sta, tbl);
2199 rs_fill_link_cmd(NULL, NULL, lq_sta, rate);
2200 /* TODO restore station should remember the lq cmd */
2201 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2204 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2205 struct ieee80211_tx_rate_control *txrc)
2207 struct sk_buff *skb = txrc->skb;
2208 struct ieee80211_supported_band *sband = txrc->sband;
2209 struct iwl_op_mode *op_mode __maybe_unused =
2210 (struct iwl_op_mode *)mvm_r;
2211 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2212 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2213 struct iwl_lq_sta *lq_sta = mvm_sta;
2215 /* Get max rate if user set max rate */
2217 lq_sta->max_rate_idx = txrc->max_rate_idx;
2218 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2219 (lq_sta->max_rate_idx != -1))
2220 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2221 if ((lq_sta->max_rate_idx < 0) ||
2222 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2223 lq_sta->max_rate_idx = -1;
2226 /* Treat uninitialized rate scaling data same as non-existing. */
2227 if (lq_sta && !lq_sta->drv) {
2228 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2232 /* Send management frames and NO_ACK data using lowest rate. */
2233 if (rate_control_send_low(sta, mvm_sta, txrc))
2236 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2237 info->band, &info->control.rates[0]);
2239 info->control.rates[0].count = 1;
2242 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2245 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2246 struct iwl_op_mode *op_mode __maybe_unused =
2247 (struct iwl_op_mode *)mvm_rate;
2248 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2250 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2252 return &sta_priv->lq_sta;
2255 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2258 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2259 (0x3 << (2 * (nss - 1)));
2260 rx_mcs >>= (2 * (nss - 1));
2262 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2263 return IWL_RATE_MCS_7_INDEX;
2264 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2265 return IWL_RATE_MCS_8_INDEX;
2266 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2267 return IWL_RATE_MCS_9_INDEX;
2269 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2273 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2274 struct ieee80211_sta_vht_cap *vht_cap,
2275 struct iwl_lq_sta *lq_sta)
2278 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2280 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2281 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2282 if (i == IWL_RATE_9M_INDEX)
2285 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2286 if (i == IWL_RATE_MCS_9_INDEX &&
2287 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2290 lq_sta->active_siso_rate |= BIT(i);
2294 if (sta->rx_nss < 2)
2297 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2298 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2299 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2300 if (i == IWL_RATE_9M_INDEX)
2303 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2304 if (i == IWL_RATE_MCS_9_INDEX &&
2305 sta->bandwidth == IEEE80211_STA_RX_BW_20)
2308 lq_sta->active_mimo2_rate |= BIT(i);
2314 * Called after adding a new station to initialize rate scaling
2316 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2317 enum ieee80211_band band, bool init)
2320 struct ieee80211_hw *hw = mvm->hw;
2321 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2322 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2323 struct iwl_mvm_sta *sta_priv;
2324 struct iwl_lq_sta *lq_sta;
2325 struct ieee80211_supported_band *sband;
2326 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2328 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2329 lq_sta = &sta_priv->lq_sta;
2330 memset(lq_sta, 0, sizeof(*lq_sta));
2332 sband = hw->wiphy->bands[band];
2334 lq_sta->lq.sta_id = sta_priv->sta_id;
2336 for (j = 0; j < LQ_SIZE; j++)
2337 for (i = 0; i < IWL_RATE_COUNT; i++)
2338 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2340 lq_sta->flush_timer = 0;
2341 lq_sta->supp_rates = sta->supp_rates[sband->band];
2344 "LQ: *** rate scale station global init for station %d ***\n",
2346 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2347 * the lowest or the highest rate.. Could consider using RSSI from
2348 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2351 lq_sta->max_rate_idx = -1;
2352 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2353 lq_sta->band = sband->band;
2355 * active legacy rates as per supported rates bitmap
2357 supp = sta->supp_rates[sband->band];
2358 lq_sta->active_legacy_rate = 0;
2359 for_each_set_bit(i, &supp, BITS_PER_LONG)
2360 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2362 /* TODO: should probably account for rx_highest for both HT/VHT */
2363 if (!vht_cap || !vht_cap->vht_supported) {
2364 /* active_siso_rate mask includes 9 MBits (bit 5),
2365 * and CCK (bits 0-3), supp_rates[] does not;
2366 * shift to convert format, force 9 MBits off.
2368 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2369 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2370 lq_sta->active_siso_rate &= ~((u16)0x2);
2371 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2374 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2375 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2376 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2377 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2379 lq_sta->is_vht = false;
2381 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2382 lq_sta->is_vht = true;
2386 "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
2387 lq_sta->active_siso_rate,
2388 lq_sta->active_mimo2_rate,
2391 /* These values will be overridden later */
2392 lq_sta->lq.single_stream_ant_msk =
2393 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2394 lq_sta->lq.dual_stream_ant_msk =
2395 iwl_fw_valid_tx_ant(mvm->fw) &
2396 ~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2397 if (!lq_sta->lq.dual_stream_ant_msk) {
2398 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2399 } else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
2400 lq_sta->lq.dual_stream_ant_msk =
2401 iwl_fw_valid_tx_ant(mvm->fw);
2404 /* as default allow aggregation for all tids */
2405 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2408 /* Set last_txrate_idx to lowest rate */
2409 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2410 if (sband->band == IEEE80211_BAND_5GHZ)
2411 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2413 #ifdef CONFIG_MAC80211_DEBUGFS
2414 lq_sta->dbg_fixed_rate = 0;
2417 rs_initialize_lq(mvm, sta, lq_sta, band, init);
2420 static void rs_rate_update(void *mvm_r,
2421 struct ieee80211_supported_band *sband,
2422 struct cfg80211_chan_def *chandef,
2423 struct ieee80211_sta *sta, void *priv_sta,
2427 struct iwl_op_mode *op_mode =
2428 (struct iwl_op_mode *)mvm_r;
2429 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2431 /* Stop any ongoing aggregations as rs starts off assuming no agg */
2432 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2433 ieee80211_stop_tx_ba_session(sta, tid);
2435 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2438 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2439 struct ieee80211_sta *sta,
2440 struct iwl_lq_sta *lq_sta, u32 new_rate)
2442 struct iwl_scale_tbl_info tbl_type;
2445 int repeat_rate = 0;
2446 u8 ant_toggle_cnt = 0;
2447 u8 use_ht_possible = 1;
2448 u8 valid_tx_ant = 0;
2449 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2451 /* Override starting rate (index 0) if needed for debug purposes */
2452 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2454 /* Interpret new_rate (rate_n_flags) */
2455 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2456 &tbl_type, &rate_idx);
2458 /* How many times should we repeat the initial rate? */
2459 if (is_legacy(tbl_type.lq_type)) {
2461 repeat_rate = IWL_NUMBER_TRY;
2463 repeat_rate = min(IWL_HT_NUMBER_TRY,
2464 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2467 lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2469 /* Fill 1st table entry (index 0) */
2470 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2472 if (num_of_ant(tbl_type.ant_type) == 1)
2473 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2474 else if (num_of_ant(tbl_type.ant_type) == 2)
2475 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2476 /* otherwise we don't modify the existing value */
2481 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2483 /* Fill rest of rate table */
2484 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2485 /* Repeat initial/next rate.
2486 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2487 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2488 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2489 if (is_legacy(tbl_type.lq_type)) {
2490 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2493 rs_toggle_antenna(valid_tx_ant,
2494 &new_rate, &tbl_type))
2498 /* Override next rate if needed for debug purposes */
2499 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2501 /* Fill next table entry */
2502 lq_cmd->rs_table[index] =
2503 cpu_to_le32(new_rate);
2508 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2511 /* Indicate to uCode which entries might be MIMO.
2512 * If initial rate was MIMO, this will finally end up
2513 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2514 if (is_mimo(tbl_type.lq_type))
2515 lq_cmd->mimo_delim = index;
2518 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2521 /* How many times should we repeat the next rate? */
2522 if (is_legacy(tbl_type.lq_type)) {
2523 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2526 rs_toggle_antenna(valid_tx_ant,
2527 &new_rate, &tbl_type))
2530 repeat_rate = IWL_NUMBER_TRY;
2532 repeat_rate = IWL_HT_NUMBER_TRY;
2535 /* Don't allow HT rates after next pass.
2536 * rs_get_lower_rate() will change type to LQ_LEGACY_A
2539 use_ht_possible = 0;
2541 /* Override next rate if needed for debug purposes */
2542 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2544 /* Fill next table entry */
2545 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2551 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2552 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2554 lq_cmd->agg_time_limit =
2555 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2558 lq_cmd->agg_time_limit =
2559 cpu_to_le16(iwl_mvm_bt_coex_agg_time_limit(mvm, sta));
2562 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2566 /* rate scale requires free function to be implemented */
2567 static void rs_free(void *mvm_rate)
2572 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2575 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2576 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2578 IWL_DEBUG_RATE(mvm, "enter\n");
2579 IWL_DEBUG_RATE(mvm, "leave\n");
2582 #ifdef CONFIG_MAC80211_DEBUGFS
2583 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2586 struct iwl_mvm *mvm;
2591 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2592 if (lq_sta->dbg_fixed_rate) {
2594 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2595 >> RATE_MCS_ANT_POS);
2596 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2597 *rate_n_flags = lq_sta->dbg_fixed_rate;
2599 lq_sta->dbg_fixed_rate = 0;
2601 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2602 ant_sel_tx, valid_tx_ant);
2603 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2608 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2609 const char __user *user_buf, size_t count, loff_t *ppos)
2611 struct iwl_lq_sta *lq_sta = file->private_data;
2612 struct iwl_mvm *mvm;
2619 memset(buf, 0, sizeof(buf));
2620 buf_size = min(count, sizeof(buf) - 1);
2621 if (copy_from_user(buf, user_buf, buf_size))
2624 if (sscanf(buf, "%x", &parsed_rate) == 1)
2625 lq_sta->dbg_fixed_rate = parsed_rate;
2627 lq_sta->dbg_fixed_rate = 0;
2629 rs_program_fix_rate(mvm, lq_sta);
2634 static const char *rs_pretty_lq_type(enum iwl_table_type type)
2636 static const char * const lq_type[] = {
2638 [LQ_LEGACY_A] = "LEGACY_A",
2639 [LQ_LEGACY_G] = "LEGACY_G",
2640 [LQ_HT_SISO] = "HT SISO",
2641 [LQ_HT_MIMO2] = "HT MIMO",
2642 [LQ_VHT_SISO] = "VHT SISO",
2643 [LQ_VHT_MIMO2] = "VHT MIMO",
2646 if (type < LQ_NONE || type >= LQ_MAX)
2649 return lq_type[type];
2652 static int rs_pretty_print_rate(char *buf, const u32 rate)
2654 static const char * const ant_name[] = {
2655 [ANT_NONE] = "None",
2666 u8 mcs = 0, nss = 0;
2667 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2669 if (!(rate & RATE_MCS_HT_MSK) &&
2670 !(rate & RATE_MCS_VHT_MSK)) {
2671 int index = iwl_hwrate_to_plcp_idx(rate);
2673 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2674 ant_name[ant], iwl_rate_mcs[index].mbps);
2677 if (rate & RATE_MCS_VHT_MSK) {
2679 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2680 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2681 >> RATE_VHT_MCS_NSS_POS) + 1;
2682 } else if (rate & RATE_MCS_HT_MSK) {
2684 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2686 type = "Unknown"; /* shouldn't happen */
2689 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2690 case RATE_MCS_CHAN_WIDTH_20:
2693 case RATE_MCS_CHAN_WIDTH_40:
2696 case RATE_MCS_CHAN_WIDTH_80:
2699 case RATE_MCS_CHAN_WIDTH_160:
2706 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2707 type, ant_name[ant], bw, mcs, nss,
2708 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2709 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
2710 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2711 (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2712 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2715 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2716 char __user *user_buf, size_t count, loff_t *ppos)
2723 struct iwl_lq_sta *lq_sta = file->private_data;
2724 struct iwl_mvm *mvm;
2725 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2728 buff = kmalloc(2048, GFP_KERNEL);
2732 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2733 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2734 lq_sta->total_failed, lq_sta->total_success,
2735 lq_sta->active_legacy_rate);
2736 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2737 lq_sta->dbg_fixed_rate);
2738 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2739 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2740 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2741 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
2742 desc += sprintf(buff+desc, "lq type %s\n",
2743 (is_legacy(tbl->lq_type)) ? "legacy" :
2744 is_vht(tbl->lq_type) ? "VHT" : "HT");
2745 if (!is_legacy(tbl->lq_type)) {
2746 desc += sprintf(buff+desc, " %s",
2747 (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2748 desc += sprintf(buff+desc, " %s",
2749 (is_ht20(tbl)) ? "20MHz" :
2750 (is_ht40(tbl)) ? "40MHz" :
2751 (is_ht80(tbl)) ? "80Mhz" : "BAD BW");
2752 desc += sprintf(buff+desc, " %s %s\n",
2753 (tbl->is_SGI) ? "SGI" : "NGI",
2754 (lq_sta->is_agg) ? "AGG on" : "");
2756 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2757 lq_sta->last_rate_n_flags);
2758 desc += sprintf(buff+desc,
2759 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
2761 lq_sta->lq.mimo_delim,
2762 lq_sta->lq.single_stream_ant_msk,
2763 lq_sta->lq.dual_stream_ant_msk);
2765 desc += sprintf(buff+desc,
2766 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2767 le16_to_cpu(lq_sta->lq.agg_time_limit),
2768 lq_sta->lq.agg_disable_start_th,
2769 lq_sta->lq.agg_frame_cnt_limit);
2771 desc += sprintf(buff+desc,
2772 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2773 lq_sta->lq.initial_rate_index[0],
2774 lq_sta->lq.initial_rate_index[1],
2775 lq_sta->lq.initial_rate_index[2],
2776 lq_sta->lq.initial_rate_index[3]);
2778 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2779 u32 rate = le32_to_cpu(lq_sta->lq.rs_table[i]);
2780 desc += sprintf(buff+desc,
2784 desc += rs_pretty_print_rate(buff+desc, rate);
2787 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2792 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2793 .write = rs_sta_dbgfs_scale_table_write,
2794 .read = rs_sta_dbgfs_scale_table_read,
2795 .open = simple_open,
2796 .llseek = default_llseek,
2798 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2799 char __user *user_buf, size_t count, loff_t *ppos)
2805 struct iwl_scale_tbl_info *tbl;
2806 struct iwl_lq_sta *lq_sta = file->private_data;
2808 buff = kmalloc(1024, GFP_KERNEL);
2812 for (i = 0; i < LQ_SIZE; i++) {
2813 tbl = &(lq_sta->lq_info[i]);
2814 desc += sprintf(buff+desc,
2815 "%s type=%d SGI=%d BW=%s DUP=0\n"
2817 lq_sta->active_tbl == i ? "*" : "x",
2820 is_ht20(tbl) ? "20Mhz" :
2821 is_ht40(tbl) ? "40Mhz" :
2822 is_ht80(tbl) ? "80Mhz" : "ERR",
2824 for (j = 0; j < IWL_RATE_COUNT; j++) {
2825 desc += sprintf(buff+desc,
2826 "counter=%d success=%d %%=%d\n",
2827 tbl->win[j].counter,
2828 tbl->win[j].success_counter,
2829 tbl->win[j].success_ratio);
2832 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2837 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2838 .read = rs_sta_dbgfs_stats_table_read,
2839 .open = simple_open,
2840 .llseek = default_llseek,
2843 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2845 struct iwl_lq_sta *lq_sta = mvm_sta;
2846 lq_sta->rs_sta_dbgfs_scale_table_file =
2847 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2848 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2849 lq_sta->rs_sta_dbgfs_stats_table_file =
2850 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2851 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2852 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2853 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2854 &lq_sta->tx_agg_tid_en);
2857 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2859 struct iwl_lq_sta *lq_sta = mvm_sta;
2860 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2861 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2862 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2867 * Initialization of rate scaling information is done by driver after
2868 * the station is added. Since mac80211 calls this function before a
2869 * station is added we ignore it.
2871 static void rs_rate_init_stub(void *mvm_r,
2872 struct ieee80211_supported_band *sband,
2873 struct cfg80211_chan_def *chandef,
2874 struct ieee80211_sta *sta, void *mvm_sta)
2877 static struct rate_control_ops rs_mvm_ops = {
2880 .tx_status = rs_tx_status,
2881 .get_rate = rs_get_rate,
2882 .rate_init = rs_rate_init_stub,
2885 .alloc_sta = rs_alloc_sta,
2886 .free_sta = rs_free_sta,
2887 .rate_update = rs_rate_update,
2888 #ifdef CONFIG_MAC80211_DEBUGFS
2889 .add_sta_debugfs = rs_add_debugfs,
2890 .remove_sta_debugfs = rs_remove_debugfs,
2894 int iwl_mvm_rate_control_register(void)
2896 return ieee80211_rate_control_register(&rs_mvm_ops);
2899 void iwl_mvm_rate_control_unregister(void)
2901 ieee80211_rate_control_unregister(&rs_mvm_ops);
2905 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2906 * Tx protection, according to this rquest and previous requests,
2907 * and send the LQ command.
2908 * @mvmsta: The station
2909 * @enable: Enable Tx protection?
2911 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2914 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2916 lockdep_assert_held(&mvm->mutex);
2919 if (mvmsta->tx_protection == 0)
2920 lq->flags |= LQ_FLAG_USE_RTS_MSK;
2921 mvmsta->tx_protection++;
2923 mvmsta->tx_protection--;
2924 if (mvmsta->tx_protection == 0)
2925 lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
2928 return iwl_mvm_send_lq_cmd(mvm, lq, false);