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 6 /* 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);
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, CMD_ASYNC, 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)
313 * Don't create TX aggregation sessions when in high
314 * BT traffic, as they would just be disrupted by BT.
316 if (le32_to_cpu(mvm->last_bt_notif.bt_activity_grading) >= 2) {
317 IWL_DEBUG_COEX(mvm, "BT traffic (%d), no aggregation allowed\n",
318 BT_MBOX_MSG(&mvm->last_bt_notif,
323 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
325 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
326 if (ret == -EAGAIN) {
328 * driver and mac80211 is out of sync
329 * this might be cause by reloading firmware
330 * stop the tx ba session here
332 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
334 ieee80211_stop_tx_ba_session(sta, tid);
339 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
340 struct iwl_lq_sta *lq_data,
341 struct ieee80211_sta *sta)
343 if (tid < IWL_MAX_TID_COUNT)
344 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
346 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
347 tid, IWL_MAX_TID_COUNT);
350 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
352 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
353 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
354 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
358 * Static function to get the expected throughput from an iwl_scale_tbl_info
359 * that wraps a NULL pointer check
361 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
363 if (tbl->expected_tpt)
364 return tbl->expected_tpt[rs_index];
369 * rs_collect_tx_data - Update the success/failure sliding window
371 * We keep a sliding window of the last 62 packets transmitted
372 * at this rate. window->data contains the bitmask of successful
375 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
376 int scale_index, int attempts, int successes)
378 struct iwl_rate_scale_data *window = NULL;
379 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
382 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
385 /* Select window for current tx bit rate */
386 window = &(tbl->win[scale_index]);
388 /* Get expected throughput */
389 tpt = get_expected_tpt(tbl, scale_index);
392 * Keep track of only the latest 62 tx frame attempts in this rate's
393 * history window; anything older isn't really relevant any more.
394 * If we have filled up the sliding window, drop the oldest attempt;
395 * if the oldest attempt (highest bit in bitmap) shows "success",
396 * subtract "1" from the success counter (this is the main reason
397 * we keep these bitmaps!).
399 while (attempts > 0) {
400 if (window->counter >= IWL_RATE_MAX_WINDOW) {
401 /* remove earliest */
402 window->counter = IWL_RATE_MAX_WINDOW - 1;
404 if (window->data & mask) {
405 window->data &= ~mask;
406 window->success_counter--;
410 /* Increment frames-attempted counter */
413 /* Shift bitmap by one frame to throw away oldest history */
416 /* Mark the most recent #successes attempts as successful */
418 window->success_counter++;
426 /* Calculate current success ratio, avoid divide-by-0! */
427 if (window->counter > 0)
428 window->success_ratio = 128 * (100 * window->success_counter)
431 window->success_ratio = IWL_INVALID_VALUE;
433 fail_count = window->counter - window->success_counter;
435 /* Calculate average throughput, if we have enough history. */
436 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
437 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
438 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
440 window->average_tpt = IWL_INVALID_VALUE;
442 /* Tag this window as having been updated */
443 window->stamp = jiffies;
449 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
451 /* FIXME:RS:remove this function and put the flags statically in the table */
452 static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm,
453 struct iwl_scale_tbl_info *tbl, int index)
455 u32 rate_n_flags = 0;
457 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
458 RATE_MCS_ANT_ABC_MSK);
460 if (is_legacy(tbl->lq_type)) {
461 rate_n_flags |= iwl_rates[index].plcp;
462 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
463 rate_n_flags |= RATE_MCS_CCK_MSK;
467 if (is_ht(tbl->lq_type)) {
468 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
469 IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
470 index = IWL_LAST_HT_RATE;
472 rate_n_flags |= RATE_MCS_HT_MSK;
474 if (is_ht_siso(tbl->lq_type))
475 rate_n_flags |= iwl_rates[index].plcp_ht_siso;
476 else if (is_ht_mimo2(tbl->lq_type))
477 rate_n_flags |= iwl_rates[index].plcp_ht_mimo2;
480 } else if (is_vht(tbl->lq_type)) {
481 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
482 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
483 index = IWL_LAST_VHT_RATE;
485 rate_n_flags |= RATE_MCS_VHT_MSK;
486 if (is_vht_siso(tbl->lq_type))
487 rate_n_flags |= iwl_rates[index].plcp_vht_siso;
488 else if (is_vht_mimo2(tbl->lq_type))
489 rate_n_flags |= iwl_rates[index].plcp_vht_mimo2;
494 IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type);
497 rate_n_flags |= tbl->bw;
499 rate_n_flags |= RATE_MCS_SGI_MSK;
505 * Interpret uCode API's rate_n_flags format,
506 * fill "search" or "active" tx mode table.
508 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
509 enum ieee80211_band band,
510 struct iwl_scale_tbl_info *tbl,
513 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
514 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
517 memset(tbl, 0, offsetof(struct iwl_scale_tbl_info, win));
518 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
520 if (*rate_idx == IWL_RATE_INVALID) {
524 tbl->is_SGI = 0; /* default legacy setup */
526 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
527 tbl->lq_type = LQ_NONE;
528 tbl->max_search = IWL_MAX_SEARCH;
531 if (!(rate_n_flags & RATE_MCS_HT_MSK) &&
532 !(rate_n_flags & RATE_MCS_VHT_MSK)) {
533 if (num_of_ant == 1) {
534 if (band == IEEE80211_BAND_5GHZ)
535 tbl->lq_type = LQ_LEGACY_A;
537 tbl->lq_type = LQ_LEGACY_G;
544 if (rate_n_flags & RATE_MCS_SGI_MSK)
547 tbl->bw = rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK;
549 if (rate_n_flags & RATE_MCS_HT_MSK) {
550 nss = ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
551 RATE_HT_MCS_NSS_POS) + 1;
554 tbl->lq_type = LQ_HT_SISO;
555 WARN_ON_ONCE(num_of_ant != 1);
556 } else if (nss == 2) {
557 tbl->lq_type = LQ_HT_MIMO2;
558 WARN_ON_ONCE(num_of_ant != 2);
562 } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
563 nss = ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
564 RATE_VHT_MCS_NSS_POS) + 1;
567 tbl->lq_type = LQ_VHT_SISO;
568 WARN_ON_ONCE(num_of_ant != 1);
569 } else if (nss == 2) {
570 tbl->lq_type = LQ_VHT_MIMO2;
571 WARN_ON_ONCE(num_of_ant != 2);
577 WARN_ON_ONCE(tbl->bw == RATE_MCS_CHAN_WIDTH_160);
578 WARN_ON_ONCE(tbl->bw == RATE_MCS_CHAN_WIDTH_80 &&
579 !is_vht(tbl->lq_type));
584 /* switch to another antenna/antennas and return 1 */
585 /* if no other valid antenna found, return 0 */
586 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
587 struct iwl_scale_tbl_info *tbl)
591 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
594 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
597 new_ant_type = ant_toggle_lookup[tbl->ant_type];
599 while ((new_ant_type != tbl->ant_type) &&
600 !rs_is_valid_ant(valid_ant, new_ant_type))
601 new_ant_type = ant_toggle_lookup[new_ant_type];
603 if (new_ant_type == tbl->ant_type)
606 tbl->ant_type = new_ant_type;
607 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
608 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
613 * rs_get_supported_rates - get the available rates
615 * if management frame or broadcast frame only return
616 * basic available rates.
619 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
620 struct ieee80211_hdr *hdr,
621 enum iwl_table_type rate_type)
623 if (is_legacy(rate_type))
624 return lq_sta->active_legacy_rate;
625 else if (is_siso(rate_type))
626 return lq_sta->active_siso_rate;
627 else if (is_mimo2(rate_type))
628 return lq_sta->active_mimo2_rate;
634 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
637 u8 high = IWL_RATE_INVALID;
638 u8 low = IWL_RATE_INVALID;
640 /* 802.11A or ht walks to the next literal adjacent rate in
642 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
646 /* Find the previous rate that is in the rate mask */
648 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
649 if (rate_mask & mask) {
655 /* Find the next rate that is in the rate mask */
657 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
658 if (rate_mask & mask) {
664 return (high << 8) | low;
668 while (low != IWL_RATE_INVALID) {
669 low = iwl_rates[low].prev_rs;
670 if (low == IWL_RATE_INVALID)
672 if (rate_mask & (1 << low))
674 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
678 while (high != IWL_RATE_INVALID) {
679 high = iwl_rates[high].next_rs;
680 if (high == IWL_RATE_INVALID)
682 if (rate_mask & (1 << high))
684 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
687 return (high << 8) | low;
690 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
691 struct iwl_scale_tbl_info *tbl,
692 u8 scale_index, u8 ht_possible)
697 u8 switch_to_legacy = 0;
698 struct iwl_mvm *mvm = lq_sta->drv;
700 /* check if we need to switch from HT to legacy rates.
701 * assumption is that mandatory rates (1Mbps or 6Mbps)
702 * are always supported (spec demand) */
703 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
704 switch_to_legacy = 1;
705 scale_index = rs_ht_to_legacy[scale_index];
706 if (lq_sta->band == IEEE80211_BAND_5GHZ)
707 tbl->lq_type = LQ_LEGACY_A;
709 tbl->lq_type = LQ_LEGACY_G;
711 if (num_of_ant(tbl->ant_type) > 1)
713 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
717 tbl->max_search = IWL_MAX_SEARCH;
720 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
722 /* Mask with station rate restriction */
723 if (is_legacy(tbl->lq_type)) {
724 /* supp_rates has no CCK bits in A mode */
725 if (lq_sta->band == IEEE80211_BAND_5GHZ)
726 rate_mask = (u16)(rate_mask &
727 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
729 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
732 /* If we switched from HT to legacy, check current rate */
733 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
738 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
740 low = high_low & 0xff;
742 if (low == IWL_RATE_INVALID)
746 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low);
750 * Simple function to compare two rate scale table types
752 static bool table_type_matches(struct iwl_scale_tbl_info *a,
753 struct iwl_scale_tbl_info *b)
755 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
756 (a->is_SGI == b->is_SGI);
759 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
761 if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
762 return RATE_MCS_CHAN_WIDTH_40;
763 else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
764 return RATE_MCS_CHAN_WIDTH_80;
765 else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
766 return RATE_MCS_CHAN_WIDTH_160;
768 return RATE_MCS_CHAN_WIDTH_20;
772 * mac80211 sends us Tx status
774 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
775 struct ieee80211_sta *sta, void *priv_sta,
780 int rs_index, mac_index, i;
781 struct iwl_lq_sta *lq_sta = priv_sta;
782 struct iwl_lq_cmd *table;
783 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
784 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
785 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
786 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
787 enum mac80211_rate_control_flags mac_flags;
789 struct iwl_scale_tbl_info tbl_type;
790 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
792 IWL_DEBUG_RATE_LIMIT(mvm,
793 "get frame ack response, update rate scale window\n");
795 /* Treat uninitialized rate scaling data same as non-existing. */
797 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
799 } else if (!lq_sta->drv) {
800 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
804 if (!ieee80211_is_data(hdr->frame_control) ||
805 info->flags & IEEE80211_TX_CTL_NO_ACK)
808 /* This packet was aggregated but doesn't carry status info */
809 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
810 !(info->flags & IEEE80211_TX_STAT_AMPDU))
814 * Ignore this Tx frame response if its initial rate doesn't match
815 * that of latest Link Quality command. There may be stragglers
816 * from a previous Link Quality command, but we're no longer interested
817 * in those; they're either from the "active" mode while we're trying
818 * to check "search" mode, or a prior "search" mode after we've moved
819 * to a new "search" mode (which might become the new "active" mode).
822 tx_rate = le32_to_cpu(table->rs_table[0]);
823 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index);
824 if (info->band == IEEE80211_BAND_5GHZ)
825 rs_index -= IWL_FIRST_OFDM_RATE;
826 mac_flags = info->status.rates[0].flags;
827 mac_index = info->status.rates[0].idx;
828 /* For HT packets, map MCS to PLCP */
829 if (mac_flags & IEEE80211_TX_RC_MCS) {
830 /* Remove # of streams */
831 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
832 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
835 * mac80211 HT index is always zero-indexed; we need to move
836 * HT OFDM rates after CCK rates in 2.4 GHz band
838 if (info->band == IEEE80211_BAND_2GHZ)
839 mac_index += IWL_FIRST_OFDM_RATE;
840 } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
841 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
842 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
846 /* Here we actually compare this rate to the latest LQ command */
847 if ((mac_index < 0) ||
848 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
849 (tbl_type.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
850 (tbl_type.ant_type != info->status.antenna) ||
851 (!!(tx_rate & RATE_MCS_HT_MSK) !=
852 !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
853 (!!(tx_rate & RATE_MCS_VHT_MSK) !=
854 !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
855 (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
856 !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
857 (rs_index != mac_index)) {
859 "initial rate %d does not match %d (0x%x)\n",
860 mac_index, rs_index, tx_rate);
862 * Since rates mis-match, the last LQ command may have failed.
863 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
866 lq_sta->missed_rate_counter++;
867 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
868 lq_sta->missed_rate_counter = 0;
869 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
871 /* Regardless, ignore this status info for outdated rate */
874 /* Rate did match, so reset the missed_rate_counter */
875 lq_sta->missed_rate_counter = 0;
877 /* Figure out if rate scale algorithm is in active or search table */
878 if (table_type_matches(&tbl_type,
879 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
880 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
881 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
882 } else if (table_type_matches(
883 &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
884 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
885 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
888 "Neither active nor search matches tx rate\n");
889 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
890 IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n",
891 tmp_tbl->lq_type, tmp_tbl->ant_type,
893 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
894 IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n",
895 tmp_tbl->lq_type, tmp_tbl->ant_type,
897 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
898 tbl_type.lq_type, tbl_type.ant_type,
901 * no matching table found, let's by-pass the data collection
902 * and continue to perform rate scale to find the rate table
904 rs_stay_in_table(lq_sta, true);
909 * Updating the frame history depends on whether packets were
912 * For aggregation, all packets were transmitted at the same rate, the
913 * first index into rate scale table.
915 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
916 tx_rate = le32_to_cpu(table->rs_table[0]);
917 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type,
919 rs_collect_tx_data(curr_tbl, rs_index,
920 info->status.ampdu_len,
921 info->status.ampdu_ack_len);
923 /* Update success/fail counts if not searching for new mode */
924 if (lq_sta->stay_in_tbl) {
925 lq_sta->total_success += info->status.ampdu_ack_len;
926 lq_sta->total_failed += (info->status.ampdu_len -
927 info->status.ampdu_ack_len);
931 * For legacy, update frame history with for each Tx retry.
933 retries = info->status.rates[0].count - 1;
934 /* HW doesn't send more than 15 retries */
935 retries = min(retries, 15);
937 /* The last transmission may have been successful */
938 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
939 /* Collect data for each rate used during failed TX attempts */
940 for (i = 0; i <= retries; ++i) {
941 tx_rate = le32_to_cpu(table->rs_table[i]);
942 rs_get_tbl_info_from_mcs(tx_rate, info->band,
943 &tbl_type, &rs_index);
945 * Only collect stats if retried rate is in the same RS
946 * table as active/search.
948 if (table_type_matches(&tbl_type, curr_tbl))
950 else if (table_type_matches(&tbl_type, other_tbl))
954 rs_collect_tx_data(tmp_tbl, rs_index, 1,
955 i < retries ? 0 : legacy_success);
958 /* Update success/fail counts if not searching for new mode */
959 if (lq_sta->stay_in_tbl) {
960 lq_sta->total_success += legacy_success;
961 lq_sta->total_failed += retries + (1 - legacy_success);
964 /* The last TX rate is cached in lq_sta; it's set in if/else above */
965 lq_sta->last_rate_n_flags = tx_rate;
967 /* See if there's a better rate or modulation mode to try. */
968 if (sta && sta->supp_rates[sband->band])
969 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
973 * Begin a period of staying with a selected modulation mode.
974 * Set "stay_in_tbl" flag to prevent any mode switches.
975 * Set frame tx success limits according to legacy vs. high-throughput,
976 * and reset overall (spanning all rates) tx success history statistics.
977 * These control how long we stay using same modulation mode before
978 * searching for a new mode.
980 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
981 struct iwl_lq_sta *lq_sta)
983 IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
984 lq_sta->stay_in_tbl = 1; /* only place this gets set */
986 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
987 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
988 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
990 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
991 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
992 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
994 lq_sta->table_count = 0;
995 lq_sta->total_failed = 0;
996 lq_sta->total_success = 0;
997 lq_sta->flush_timer = jiffies;
998 lq_sta->action_counter = 0;
1002 * Find correct throughput table for given mode of modulation
1004 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1005 struct iwl_scale_tbl_info *tbl)
1007 /* Used to choose among HT tables */
1008 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1010 /* Check for invalid LQ type */
1011 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_ht(tbl->lq_type) &&
1012 !(is_vht(tbl->lq_type)))) {
1013 tbl->expected_tpt = expected_tpt_legacy;
1017 /* Legacy rates have only one table */
1018 if (is_legacy(tbl->lq_type)) {
1019 tbl->expected_tpt = expected_tpt_legacy;
1023 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1024 /* Choose among many HT tables depending on number of streams
1025 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1027 if (is_siso(tbl->lq_type)) {
1029 case RATE_MCS_CHAN_WIDTH_20:
1030 ht_tbl_pointer = expected_tpt_siso_20MHz;
1032 case RATE_MCS_CHAN_WIDTH_40:
1033 ht_tbl_pointer = expected_tpt_siso_40MHz;
1035 case RATE_MCS_CHAN_WIDTH_80:
1036 ht_tbl_pointer = expected_tpt_siso_80MHz;
1041 } else if (is_mimo2(tbl->lq_type)) {
1043 case RATE_MCS_CHAN_WIDTH_20:
1044 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1046 case RATE_MCS_CHAN_WIDTH_40:
1047 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1049 case RATE_MCS_CHAN_WIDTH_80:
1050 ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1059 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1060 tbl->expected_tpt = ht_tbl_pointer[0];
1061 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1062 tbl->expected_tpt = ht_tbl_pointer[1];
1063 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1064 tbl->expected_tpt = ht_tbl_pointer[2];
1066 tbl->expected_tpt = ht_tbl_pointer[3];
1070 * Find starting rate for new "search" high-throughput mode of modulation.
1071 * Goal is to find lowest expected rate (under perfect conditions) that is
1072 * above the current measured throughput of "active" mode, to give new mode
1073 * a fair chance to prove itself without too many challenges.
1075 * This gets called when transitioning to more aggressive modulation
1076 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1077 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1078 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1079 * bit rate will typically need to increase, but not if performance was bad.
1081 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1082 struct iwl_lq_sta *lq_sta,
1083 struct iwl_scale_tbl_info *tbl, /* "search" */
1084 u16 rate_mask, s8 index)
1086 /* "active" values */
1087 struct iwl_scale_tbl_info *active_tbl =
1088 &(lq_sta->lq_info[lq_sta->active_tbl]);
1089 s32 active_sr = active_tbl->win[index].success_ratio;
1090 s32 active_tpt = active_tbl->expected_tpt[index];
1092 /* expected "search" throughput */
1093 s32 *tpt_tbl = tbl->expected_tpt;
1095 s32 new_rate, high, low, start_hi;
1099 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1102 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1105 low = high_low & 0xff;
1106 high = (high_low >> 8) & 0xff;
1109 * Lower the "search" bit rate, to give new "search" mode
1110 * approximately the same throughput as "active" if:
1112 * 1) "Active" mode has been working modestly well (but not
1113 * great), and expected "search" throughput (under perfect
1114 * conditions) at candidate rate is above the actual
1115 * measured "active" throughput (but less than expected
1116 * "active" throughput under perfect conditions).
1118 * 2) "Active" mode has been working perfectly or very well
1119 * and expected "search" throughput (under perfect
1120 * conditions) at candidate rate is above expected
1121 * "active" throughput (under perfect conditions).
1123 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1124 ((active_sr > IWL_RATE_DECREASE_TH) &&
1125 (active_sr <= IWL_RATE_HIGH_TH) &&
1126 (tpt_tbl[rate] <= active_tpt))) ||
1127 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1128 (tpt_tbl[rate] > active_tpt))) {
1129 /* (2nd or later pass)
1130 * If we've already tried to raise the rate, and are
1131 * now trying to lower it, use the higher rate. */
1132 if (start_hi != IWL_RATE_INVALID) {
1133 new_rate = start_hi;
1139 /* Loop again with lower rate */
1140 if (low != IWL_RATE_INVALID)
1143 /* Lower rate not available, use the original */
1147 /* Else try to raise the "search" rate to match "active" */
1149 /* (2nd or later pass)
1150 * If we've already tried to lower the rate, and are
1151 * now trying to raise it, use the lower rate. */
1152 if (new_rate != IWL_RATE_INVALID)
1155 /* Loop again with higher rate */
1156 else if (high != IWL_RATE_INVALID) {
1160 /* Higher rate not available, use the original */
1171 /* Move to the next action and wrap around to the first action in case
1172 * we're at the last action. Assumes actions start at 0.
1174 static inline void rs_move_next_action(struct iwl_scale_tbl_info *tbl,
1177 BUILD_BUG_ON(IWL_LEGACY_FIRST_ACTION != 0);
1178 BUILD_BUG_ON(IWL_SISO_FIRST_ACTION != 0);
1179 BUILD_BUG_ON(IWL_MIMO2_FIRST_ACTION != 0);
1181 tbl->action = (tbl->action + 1) % (last_action + 1);
1184 static void rs_set_bw_from_sta(struct iwl_scale_tbl_info *tbl,
1185 struct ieee80211_sta *sta)
1187 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1188 tbl->bw = RATE_MCS_CHAN_WIDTH_80;
1189 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1190 tbl->bw = RATE_MCS_CHAN_WIDTH_40;
1192 tbl->bw = RATE_MCS_CHAN_WIDTH_20;
1195 static bool rs_sgi_allowed(struct iwl_scale_tbl_info *tbl,
1196 struct ieee80211_sta *sta)
1198 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1199 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
1201 if (is_ht20(tbl) && (ht_cap->cap &
1202 IEEE80211_HT_CAP_SGI_20))
1204 if (is_ht40(tbl) && (ht_cap->cap &
1205 IEEE80211_HT_CAP_SGI_40))
1207 if (is_ht80(tbl) && (vht_cap->cap &
1208 IEEE80211_VHT_CAP_SHORT_GI_80))
1215 * Set up search table for MIMO2
1217 static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1218 struct iwl_lq_sta *lq_sta,
1219 struct ieee80211_sta *sta,
1220 struct iwl_scale_tbl_info *tbl, int index)
1225 if (!sta->ht_cap.ht_supported)
1228 if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1231 /* Need both Tx chains/antennas to support MIMO */
1232 if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
1235 IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1237 tbl->lq_type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1239 tbl->max_search = IWL_MAX_SEARCH;
1240 rate_mask = lq_sta->active_mimo2_rate;
1242 rs_set_bw_from_sta(tbl, sta);
1243 rs_set_expected_tpt_table(lq_sta, tbl);
1245 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1247 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
1249 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1250 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1254 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate);
1256 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index\n",
1262 * Set up search table for SISO
1264 static int rs_switch_to_siso(struct iwl_mvm *mvm,
1265 struct iwl_lq_sta *lq_sta,
1266 struct ieee80211_sta *sta,
1267 struct iwl_scale_tbl_info *tbl, int index)
1272 if (!sta->ht_cap.ht_supported)
1275 IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1277 tbl->lq_type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1279 tbl->max_search = IWL_MAX_SEARCH;
1280 rate_mask = lq_sta->active_siso_rate;
1282 rs_set_bw_from_sta(tbl, sta);
1283 rs_set_expected_tpt_table(lq_sta, tbl);
1284 rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1286 IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1287 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1289 "can not switch with index %d rate mask %x\n",
1293 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate);
1294 IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index\n",
1300 * Try to switch to new modulation mode from legacy
1302 static int rs_move_legacy_other(struct iwl_mvm *mvm,
1303 struct iwl_lq_sta *lq_sta,
1304 struct ieee80211_sta *sta,
1307 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1308 struct iwl_scale_tbl_info *search_tbl =
1309 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1310 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1311 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1312 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1314 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1315 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1317 u8 update_search_tbl_counter = 0;
1319 start_action = tbl->action;
1321 lq_sta->action_counter++;
1322 switch (tbl->action) {
1323 case IWL_LEGACY_SWITCH_ANTENNA:
1324 IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1326 if (tx_chains_num <= 1)
1329 /* Don't change antenna if success has been great */
1330 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1333 /* Set up search table to try other antenna */
1334 memcpy(search_tbl, tbl, sz);
1336 if (rs_toggle_antenna(valid_tx_ant,
1337 &search_tbl->current_rate,
1339 update_search_tbl_counter = 1;
1340 rs_set_expected_tpt_table(lq_sta, search_tbl);
1344 case IWL_LEGACY_SWITCH_SISO:
1345 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1347 /* Set up search table to try SISO */
1348 memcpy(search_tbl, tbl, sz);
1349 search_tbl->is_SGI = 0;
1350 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1353 lq_sta->action_counter = 0;
1358 case IWL_LEGACY_SWITCH_MIMO2:
1359 IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1361 /* Set up search table to try MIMO */
1362 memcpy(search_tbl, tbl, sz);
1363 search_tbl->is_SGI = 0;
1365 search_tbl->ant_type = ANT_AB;
1367 if (!rs_is_valid_ant(valid_tx_ant,
1368 search_tbl->ant_type))
1371 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1374 lq_sta->action_counter = 0;
1381 rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
1383 if (tbl->action == start_action)
1386 search_tbl->lq_type = LQ_NONE;
1390 lq_sta->search_better_tbl = 1;
1391 rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
1392 if (update_search_tbl_counter)
1393 search_tbl->action = tbl->action;
1398 * Try to switch to new modulation mode from SISO
1400 static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1401 struct iwl_lq_sta *lq_sta,
1402 struct ieee80211_sta *sta, int index)
1404 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1405 struct iwl_scale_tbl_info *search_tbl =
1406 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1407 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1408 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1409 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1411 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1412 u8 tx_chains_num = num_of_ant(valid_tx_ant);
1413 u8 update_search_tbl_counter = 0;
1416 switch (le32_to_cpu(mvm->last_bt_notif.bt_activity_grading)) {
1417 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1420 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1421 /* avoid switching to antenna B but allow MIMO */
1422 if (tbl->action == IWL_SISO_SWITCH_ANTENNA &&
1423 tbl->ant_type == ANT_A)
1424 tbl->action = IWL_SISO_SWITCH_MIMO2;
1426 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1427 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1428 /* A - avoid antenna B and MIMO. B - switch to A */
1429 if (tbl->ant_type == ANT_A)
1431 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
1432 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1435 IWL_ERR(mvm, "Invalid BT load %d",
1436 le32_to_cpu(mvm->last_bt_notif.bt_activity_grading));
1440 start_action = tbl->action;
1442 lq_sta->action_counter++;
1443 switch (tbl->action) {
1444 case IWL_SISO_SWITCH_ANTENNA:
1445 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
1446 if (tx_chains_num <= 1)
1449 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1450 BT_MBOX_MSG(&mvm->last_bt_notif, 3,
1454 memcpy(search_tbl, tbl, sz);
1455 if (rs_toggle_antenna(valid_tx_ant,
1456 &search_tbl->current_rate,
1458 update_search_tbl_counter = 1;
1462 case IWL_SISO_SWITCH_MIMO2:
1463 IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1464 memcpy(search_tbl, tbl, sz);
1465 search_tbl->is_SGI = 0;
1467 search_tbl->ant_type = ANT_AB;
1469 if (!rs_is_valid_ant(valid_tx_ant,
1470 search_tbl->ant_type))
1473 ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1478 case IWL_SISO_SWITCH_GI:
1479 if (!rs_sgi_allowed(tbl, sta))
1482 IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1484 memcpy(search_tbl, tbl, sz);
1485 search_tbl->is_SGI = !tbl->is_SGI;
1486 rs_set_expected_tpt_table(lq_sta, search_tbl);
1488 s32 tpt = lq_sta->last_tpt / 100;
1489 if (tpt >= search_tbl->expected_tpt[index])
1492 search_tbl->current_rate =
1493 rate_n_flags_from_tbl(mvm, search_tbl, index);
1494 update_search_tbl_counter = 1;
1499 rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
1501 if (tbl->action == start_action)
1504 search_tbl->lq_type = LQ_NONE;
1508 lq_sta->search_better_tbl = 1;
1509 rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
1510 if (update_search_tbl_counter)
1511 search_tbl->action = tbl->action;
1517 * Try to switch to new modulation mode from MIMO2
1519 static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1520 struct iwl_lq_sta *lq_sta,
1521 struct ieee80211_sta *sta, int index)
1523 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1524 struct iwl_scale_tbl_info *search_tbl =
1525 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1526 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1527 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1529 u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1530 u8 update_search_tbl_counter = 0;
1533 switch (le32_to_cpu(mvm->last_bt_notif.bt_activity_grading)) {
1534 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1537 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1538 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1539 /* avoid antenna B and MIMO */
1540 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1541 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1543 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1544 /* avoid antenna B unless MIMO */
1545 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1546 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1549 IWL_ERR(mvm, "Invalid BT load %d",
1550 le32_to_cpu(mvm->last_bt_notif.bt_activity_grading));
1554 start_action = tbl->action;
1556 lq_sta->action_counter++;
1557 switch (tbl->action) {
1558 case IWL_MIMO2_SWITCH_SISO_A:
1559 case IWL_MIMO2_SWITCH_SISO_B:
1560 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1562 /* Set up new search table for SISO */
1563 memcpy(search_tbl, tbl, sz);
1565 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1566 search_tbl->ant_type = ANT_A;
1567 else /* tbl->action == IWL_MIMO2_SWITCH_SISO_B */
1568 search_tbl->ant_type = ANT_B;
1570 if (!rs_is_valid_ant(valid_tx_ant,
1571 search_tbl->ant_type))
1574 ret = rs_switch_to_siso(mvm, lq_sta, sta,
1581 case IWL_MIMO2_SWITCH_GI:
1582 if (!rs_sgi_allowed(tbl, sta))
1585 IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1587 /* Set up new search table for MIMO2 */
1588 memcpy(search_tbl, tbl, sz);
1589 search_tbl->is_SGI = !tbl->is_SGI;
1590 rs_set_expected_tpt_table(lq_sta, search_tbl);
1592 * If active table already uses the fastest possible
1593 * modulation (dual stream with short guard interval),
1594 * and it's working well, there's no need to look
1595 * for a better type of modulation!
1598 s32 tpt = lq_sta->last_tpt / 100;
1599 if (tpt >= search_tbl->expected_tpt[index])
1602 search_tbl->current_rate =
1603 rate_n_flags_from_tbl(mvm, search_tbl, index);
1604 update_search_tbl_counter = 1;
1609 rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
1611 if (tbl->action == start_action)
1614 search_tbl->lq_type = LQ_NONE;
1617 lq_sta->search_better_tbl = 1;
1618 rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
1619 if (update_search_tbl_counter)
1620 search_tbl->action = tbl->action;
1626 * Check whether we should continue using same modulation mode, or
1627 * begin search for a new mode, based on:
1628 * 1) # tx successes or failures while using this mode
1629 * 2) # times calling this function
1630 * 3) elapsed time in this mode (not used, for now)
1632 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1634 struct iwl_scale_tbl_info *tbl;
1637 int flush_interval_passed = 0;
1638 struct iwl_mvm *mvm;
1641 active_tbl = lq_sta->active_tbl;
1643 tbl = &(lq_sta->lq_info[active_tbl]);
1645 /* If we've been disallowing search, see if we should now allow it */
1646 if (lq_sta->stay_in_tbl) {
1647 /* Elapsed time using current modulation mode */
1648 if (lq_sta->flush_timer)
1649 flush_interval_passed =
1651 (unsigned long)(lq_sta->flush_timer +
1652 IWL_RATE_SCALE_FLUSH_INTVL));
1655 * Check if we should allow search for new modulation mode.
1656 * If many frames have failed or succeeded, or we've used
1657 * this same modulation for a long time, allow search, and
1658 * reset history stats that keep track of whether we should
1659 * allow a new search. Also (below) reset all bitmaps and
1660 * stats in active history.
1663 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1664 (lq_sta->total_success > lq_sta->max_success_limit) ||
1665 ((!lq_sta->search_better_tbl) &&
1666 (lq_sta->flush_timer) && (flush_interval_passed))) {
1668 "LQ: stay is expired %d %d %d\n",
1669 lq_sta->total_failed,
1670 lq_sta->total_success,
1671 flush_interval_passed);
1673 /* Allow search for new mode */
1674 lq_sta->stay_in_tbl = 0; /* only place reset */
1675 lq_sta->total_failed = 0;
1676 lq_sta->total_success = 0;
1677 lq_sta->flush_timer = 0;
1679 * Else if we've used this modulation mode enough repetitions
1680 * (regardless of elapsed time or success/failure), reset
1681 * history bitmaps and rate-specific stats for all rates in
1685 lq_sta->table_count++;
1686 if (lq_sta->table_count >=
1687 lq_sta->table_count_limit) {
1688 lq_sta->table_count = 0;
1691 "LQ: stay in table clear win\n");
1692 for (i = 0; i < IWL_RATE_COUNT; i++)
1693 rs_rate_scale_clear_window(
1698 /* If transitioning to allow "search", reset all history
1699 * bitmaps and stats in active table (this will become the new
1700 * "search" table). */
1701 if (!lq_sta->stay_in_tbl) {
1702 for (i = 0; i < IWL_RATE_COUNT; i++)
1703 rs_rate_scale_clear_window(&(tbl->win[i]));
1709 * setup rate table in uCode
1711 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1712 struct ieee80211_sta *sta,
1713 struct iwl_lq_sta *lq_sta,
1714 struct iwl_scale_tbl_info *tbl,
1719 /* Update uCode's rate table. */
1720 rate = rate_n_flags_from_tbl(mvm, tbl, index);
1721 rs_fill_link_cmd(mvm, sta, lq_sta, rate);
1722 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
1725 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1726 struct ieee80211_hdr *hdr)
1728 u8 tid = IWL_MAX_TID_COUNT;
1730 if (ieee80211_is_data_qos(hdr->frame_control)) {
1731 u8 *qc = ieee80211_get_qos_ctl(hdr);
1735 if (unlikely(tid > IWL_MAX_TID_COUNT))
1736 tid = IWL_MAX_TID_COUNT;
1742 * Do rate scaling and search for new modulation mode.
1744 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1745 struct sk_buff *skb,
1746 struct ieee80211_sta *sta,
1747 struct iwl_lq_sta *lq_sta)
1749 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1750 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1751 int low = IWL_RATE_INVALID;
1752 int high = IWL_RATE_INVALID;
1755 struct iwl_rate_scale_data *window = NULL;
1756 int current_tpt = IWL_INVALID_VALUE;
1757 int low_tpt = IWL_INVALID_VALUE;
1758 int high_tpt = IWL_INVALID_VALUE;
1760 s8 scale_action = 0;
1763 struct iwl_scale_tbl_info *tbl, *tbl1;
1764 u16 rate_scale_index_msk = 0;
1769 u8 tid = IWL_MAX_TID_COUNT;
1770 struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1771 struct iwl_mvm_tid_data *tid_data;
1773 IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n");
1775 /* Send management frames and NO_ACK data using lowest rate. */
1776 /* TODO: this could probably be improved.. */
1777 if (!ieee80211_is_data(hdr->frame_control) ||
1778 info->flags & IEEE80211_TX_CTL_NO_ACK)
1781 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1783 tid = rs_get_tid(lq_sta, hdr);
1784 if ((tid != IWL_MAX_TID_COUNT) &&
1785 (lq_sta->tx_agg_tid_en & (1 << tid))) {
1786 tid_data = &sta_priv->tid_data[tid];
1787 if (tid_data->state == IWL_AGG_OFF)
1796 * Select rate-scale / modulation-mode table to work with in
1797 * the rest of this function: "search" if searching for better
1798 * modulation mode, or "active" if doing rate scaling within a mode.
1800 if (!lq_sta->search_better_tbl)
1801 active_tbl = lq_sta->active_tbl;
1803 active_tbl = 1 - lq_sta->active_tbl;
1805 tbl = &(lq_sta->lq_info[active_tbl]);
1807 /* current tx rate */
1808 index = lq_sta->last_txrate_idx;
1810 IWL_DEBUG_RATE(mvm, "Rate scale index %d for type %d\n", index,
1813 /* rates available for this association, and for modulation mode */
1814 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1816 IWL_DEBUG_RATE(mvm, "mask 0x%04X\n", rate_mask);
1818 /* mask with station rate restriction */
1819 if (is_legacy(tbl->lq_type)) {
1820 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1821 /* supp_rates has no CCK bits in A mode */
1822 rate_scale_index_msk = (u16) (rate_mask &
1823 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1825 rate_scale_index_msk = (u16) (rate_mask &
1826 lq_sta->supp_rates);
1829 rate_scale_index_msk = rate_mask;
1832 if (!rate_scale_index_msk)
1833 rate_scale_index_msk = rate_mask;
1835 if (!((1 << index) & rate_scale_index_msk)) {
1836 IWL_ERR(mvm, "Current Rate is not valid\n");
1837 if (lq_sta->search_better_tbl) {
1838 /* revert to active table if search table is not valid*/
1839 tbl->lq_type = LQ_NONE;
1840 lq_sta->search_better_tbl = 0;
1841 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1842 /* get "active" rate info */
1843 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1844 rs_update_rate_tbl(mvm, sta, lq_sta, tbl, index);
1849 /* Get expected throughput table and history window for current rate */
1850 if (!tbl->expected_tpt) {
1851 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1855 /* force user max rate if set by user */
1856 if ((lq_sta->max_rate_idx != -1) &&
1857 (lq_sta->max_rate_idx < index)) {
1858 index = lq_sta->max_rate_idx;
1860 window = &(tbl->win[index]);
1864 window = &(tbl->win[index]);
1867 * If there is not enough history to calculate actual average
1868 * throughput, keep analyzing results of more tx frames, without
1869 * changing rate or mode (bypass most of the rest of this function).
1870 * Set up new rate table in uCode only if old rate is not supported
1871 * in current association (use new rate found above).
1873 fail_count = window->counter - window->success_counter;
1874 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1875 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1877 "LQ: still below TH. succ=%d total=%d for index %d\n",
1878 window->success_counter, window->counter, index);
1880 /* Can't calculate this yet; not enough history */
1881 window->average_tpt = IWL_INVALID_VALUE;
1883 /* Should we stay with this modulation mode,
1884 * or search for a new one? */
1885 rs_stay_in_table(lq_sta, false);
1889 /* Else we have enough samples; calculate estimate of
1890 * actual average throughput */
1891 if (window->average_tpt != ((window->success_ratio *
1892 tbl->expected_tpt[index] + 64) / 128)) {
1894 "expected_tpt should have been calculated by now\n");
1895 window->average_tpt = ((window->success_ratio *
1896 tbl->expected_tpt[index] + 64) / 128);
1899 /* If we are searching for better modulation mode, check success. */
1900 if (lq_sta->search_better_tbl) {
1901 /* If good success, continue using the "search" mode;
1902 * no need to send new link quality command, since we're
1903 * continuing to use the setup that we've been trying. */
1904 if (window->average_tpt > lq_sta->last_tpt) {
1906 "LQ: SWITCHING TO NEW TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
1907 window->success_ratio,
1908 window->average_tpt,
1911 if (!is_legacy(tbl->lq_type))
1912 lq_sta->enable_counter = 1;
1914 /* Swap tables; "search" becomes "active" */
1915 lq_sta->active_tbl = active_tbl;
1916 current_tpt = window->average_tpt;
1917 /* Else poor success; go back to mode in "active" table */
1920 "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
1921 window->success_ratio,
1922 window->average_tpt,
1925 /* Nullify "search" table */
1926 tbl->lq_type = LQ_NONE;
1928 /* Revert to "active" table */
1929 active_tbl = lq_sta->active_tbl;
1930 tbl = &(lq_sta->lq_info[active_tbl]);
1932 /* Revert to "active" rate and throughput info */
1933 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1934 current_tpt = lq_sta->last_tpt;
1936 /* Need to set up a new rate table in uCode */
1940 /* Either way, we've made a decision; modulation mode
1941 * search is done, allow rate adjustment next time. */
1942 lq_sta->search_better_tbl = 0;
1943 done_search = 1; /* Don't switch modes below! */
1947 /* (Else) not in search of better modulation mode, try for better
1948 * starting rate, while staying in this mode. */
1949 high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
1951 low = high_low & 0xff;
1952 high = (high_low >> 8) & 0xff;
1954 /* If user set max rate, dont allow higher than user constrain */
1955 if ((lq_sta->max_rate_idx != -1) &&
1956 (lq_sta->max_rate_idx < high))
1957 high = IWL_RATE_INVALID;
1959 sr = window->success_ratio;
1961 /* Collect measured throughputs for current and adjacent rates */
1962 current_tpt = window->average_tpt;
1963 if (low != IWL_RATE_INVALID)
1964 low_tpt = tbl->win[low].average_tpt;
1965 if (high != IWL_RATE_INVALID)
1966 high_tpt = tbl->win[high].average_tpt;
1970 /* Too many failures, decrease rate */
1971 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1973 "decrease rate because of low success_ratio\n");
1975 /* No throughput measured yet for adjacent rates; try increase. */
1976 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1977 (high_tpt == IWL_INVALID_VALUE)) {
1978 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1980 else if (low != IWL_RATE_INVALID)
1984 /* Both adjacent throughputs are measured, but neither one has better
1985 * throughput; we're using the best rate, don't change it! */
1986 else if ((low_tpt != IWL_INVALID_VALUE) &&
1987 (high_tpt != IWL_INVALID_VALUE) &&
1988 (low_tpt < current_tpt) &&
1989 (high_tpt < current_tpt))
1992 /* At least one adjacent rate's throughput is measured,
1993 * and may have better performance. */
1995 /* Higher adjacent rate's throughput is measured */
1996 if (high_tpt != IWL_INVALID_VALUE) {
1997 /* Higher rate has better throughput */
1998 if (high_tpt > current_tpt &&
1999 sr >= IWL_RATE_INCREASE_TH) {
2005 /* Lower adjacent rate's throughput is measured */
2006 } else if (low_tpt != IWL_INVALID_VALUE) {
2007 /* Lower rate has better throughput */
2008 if (low_tpt > current_tpt) {
2010 "decrease rate because of low tpt\n");
2012 } else if (sr >= IWL_RATE_INCREASE_TH) {
2018 /* Sanity check; asked for decrease, but success rate or throughput
2019 * has been good at old rate. Don't change it. */
2020 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2021 ((sr > IWL_RATE_HIGH_TH) ||
2022 (current_tpt > (100 * tbl->expected_tpt[low]))))
2025 if ((le32_to_cpu(mvm->last_bt_notif.bt_activity_grading) >=
2026 IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && (is_mimo(tbl->lq_type))) {
2027 if (lq_sta->last_bt_traffic >
2028 le32_to_cpu(mvm->last_bt_notif.bt_activity_grading)) {
2030 * don't set scale_action, don't want to scale up if
2031 * the rate scale doesn't otherwise think that is a
2034 } else if (lq_sta->last_bt_traffic <=
2035 le32_to_cpu(mvm->last_bt_notif.bt_activity_grading)) {
2039 lq_sta->last_bt_traffic =
2040 le32_to_cpu(mvm->last_bt_notif.bt_activity_grading);
2042 if ((le32_to_cpu(mvm->last_bt_notif.bt_activity_grading) >=
2043 IWL_BT_COEX_TRAFFIC_LOAD_HIGH) && is_mimo(tbl->lq_type)) {
2044 /* search for a new modulation */
2045 rs_stay_in_table(lq_sta, true);
2049 switch (scale_action) {
2051 /* Decrease starting rate, update uCode's rate table */
2052 if (low != IWL_RATE_INVALID) {
2059 /* Increase starting rate, update uCode's rate table */
2060 if (high != IWL_RATE_INVALID) {
2073 "choose rate scale index %d action %d low %d high %d type %d\n",
2074 index, scale_action, low, high, tbl->lq_type);
2077 /* Replace uCode's rate table for the destination station. */
2079 rs_update_rate_tbl(mvm, sta, lq_sta, tbl, index);
2081 rs_stay_in_table(lq_sta, false);
2084 * Search for new modulation mode if we're:
2085 * 1) Not changing rates right now
2086 * 2) Not just finishing up a search
2087 * 3) Allowing a new search
2089 if (!update_lq && !done_search &&
2090 !lq_sta->stay_in_tbl && window->counter) {
2091 /* Save current throughput to compare with "search" throughput*/
2092 lq_sta->last_tpt = current_tpt;
2094 /* Select a new "search" modulation mode to try.
2095 * If one is found, set up the new "search" table. */
2096 if (is_legacy(tbl->lq_type))
2097 rs_move_legacy_other(mvm, lq_sta, sta, index);
2098 else if (is_siso(tbl->lq_type))
2099 rs_move_siso_to_other(mvm, lq_sta, sta, index);
2100 else if (is_mimo2(tbl->lq_type))
2101 rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2105 /* If new "search" mode was selected, set up in uCode table */
2106 if (lq_sta->search_better_tbl) {
2107 /* Access the "search" table, clear its history. */
2108 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2109 for (i = 0; i < IWL_RATE_COUNT; i++)
2110 rs_rate_scale_clear_window(&(tbl->win[i]));
2112 /* Use new "search" start rate */
2113 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2116 "Switch current mcs: %X index: %d\n",
2117 tbl->current_rate, index);
2118 rs_fill_link_cmd(mvm, sta, lq_sta, tbl->current_rate);
2119 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_ASYNC, false);
2125 if (done_search && !lq_sta->stay_in_tbl) {
2126 /* If the "active" (non-search) mode was legacy,
2127 * and we've tried switching antennas,
2128 * but we haven't been able to try HT modes (not available),
2129 * stay with best antenna legacy modulation for a while
2130 * before next round of mode comparisons. */
2131 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2132 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2133 lq_sta->action_counter > tbl1->max_search) {
2134 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2135 rs_set_stay_in_table(mvm, 1, lq_sta);
2138 /* If we're in an HT mode, and all 3 mode switch actions
2139 * have been tried and compared, stay in this best modulation
2140 * mode for a while before next round of mode comparisons. */
2141 if (lq_sta->enable_counter &&
2142 (lq_sta->action_counter >= tbl1->max_search)) {
2143 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2144 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2145 (tid != IWL_MAX_TID_COUNT)) {
2146 tid_data = &sta_priv->tid_data[tid];
2147 if (tid_data->state == IWL_AGG_OFF) {
2149 "try to aggregate tid %d\n",
2151 rs_tl_turn_on_agg(mvm, tid,
2155 rs_set_stay_in_table(mvm, 0, lq_sta);
2160 tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index);
2161 lq_sta->last_txrate_idx = index;
2165 * rs_initialize_lq - Initialize a station's hardware rate table
2167 * The uCode's station table contains a table of fallback rates
2168 * for automatic fallback during transmission.
2170 * NOTE: This sets up a default set of values. These will be replaced later
2171 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2174 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2175 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2176 * which requires station table entry to exist).
2178 static void rs_initialize_lq(struct iwl_mvm *mvm,
2179 struct ieee80211_sta *sta,
2180 struct iwl_lq_sta *lq_sta,
2181 enum ieee80211_band band)
2183 struct iwl_scale_tbl_info *tbl;
2190 if (!sta || !lq_sta)
2193 i = lq_sta->last_txrate_idx;
2195 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2197 if (!lq_sta->search_better_tbl)
2198 active_tbl = lq_sta->active_tbl;
2200 active_tbl = 1 - lq_sta->active_tbl;
2202 tbl = &(lq_sta->lq_info[active_tbl]);
2204 if ((i < 0) || (i >= IWL_RATE_COUNT))
2207 rate = iwl_rates[i].plcp;
2208 tbl->ant_type = first_antenna(valid_tx_ant);
2209 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2211 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2212 rate |= RATE_MCS_CCK_MSK;
2214 rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2215 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2216 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2218 rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx);
2219 tbl->current_rate = rate;
2220 rs_set_expected_tpt_table(lq_sta, tbl);
2221 rs_fill_link_cmd(NULL, NULL, lq_sta, rate);
2222 /* TODO restore station should remember the lq cmd */
2223 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, CMD_SYNC, true);
2226 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2227 struct ieee80211_tx_rate_control *txrc)
2229 struct sk_buff *skb = txrc->skb;
2230 struct ieee80211_supported_band *sband = txrc->sband;
2231 struct iwl_op_mode *op_mode __maybe_unused =
2232 (struct iwl_op_mode *)mvm_r;
2233 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2234 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2235 struct iwl_lq_sta *lq_sta = mvm_sta;
2237 IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n");
2239 /* Get max rate if user set max rate */
2241 lq_sta->max_rate_idx = txrc->max_rate_idx;
2242 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2243 (lq_sta->max_rate_idx != -1))
2244 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2245 if ((lq_sta->max_rate_idx < 0) ||
2246 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2247 lq_sta->max_rate_idx = -1;
2250 /* Treat uninitialized rate scaling data same as non-existing. */
2251 if (lq_sta && !lq_sta->drv) {
2252 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2256 /* Send management frames and NO_ACK data using lowest rate. */
2257 if (rate_control_send_low(sta, mvm_sta, txrc))
2260 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2261 info->band, &info->control.rates[0]);
2263 info->control.rates[0].count = 1;
2266 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2269 struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2270 struct iwl_op_mode *op_mode __maybe_unused =
2271 (struct iwl_op_mode *)mvm_rate;
2272 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2274 IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2276 return &sta_priv->lq_sta;
2279 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2282 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2283 (0x3 << (2 * (nss - 1)));
2284 rx_mcs >>= (2 * (nss - 1));
2286 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2287 return IWL_RATE_MCS_7_INDEX;
2288 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2289 return IWL_RATE_MCS_8_INDEX;
2290 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2291 return IWL_RATE_MCS_9_INDEX;
2293 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2298 * Called after adding a new station to initialize rate scaling
2300 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2301 enum ieee80211_band band)
2304 struct ieee80211_hw *hw = mvm->hw;
2305 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2306 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2307 struct iwl_mvm_sta *sta_priv;
2308 struct iwl_lq_sta *lq_sta;
2309 struct ieee80211_supported_band *sband;
2310 unsigned long supp; /* must be unsigned long for for_each_set_bit */
2312 sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2313 lq_sta = &sta_priv->lq_sta;
2314 sband = hw->wiphy->bands[band];
2316 lq_sta->lq.sta_id = sta_priv->sta_id;
2318 for (j = 0; j < LQ_SIZE; j++)
2319 for (i = 0; i < IWL_RATE_COUNT; i++)
2320 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2322 lq_sta->flush_timer = 0;
2323 lq_sta->supp_rates = sta->supp_rates[sband->band];
2326 "LQ: *** rate scale station global init for station %d ***\n",
2328 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2329 * the lowest or the highest rate.. Could consider using RSSI from
2330 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2333 lq_sta->max_rate_idx = -1;
2334 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2335 lq_sta->band = sband->band;
2337 * active legacy rates as per supported rates bitmap
2339 supp = sta->supp_rates[sband->band];
2340 lq_sta->active_legacy_rate = 0;
2341 for_each_set_bit(i, &supp, BITS_PER_LONG)
2342 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2344 /* TODO: should probably account for rx_highest for both HT/VHT */
2345 if (!vht_cap || !vht_cap->vht_supported) {
2346 /* active_siso_rate mask includes 9 MBits (bit 5),
2347 * and CCK (bits 0-3), supp_rates[] does not;
2348 * shift to convert format, force 9 MBits off.
2350 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2351 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2352 lq_sta->active_siso_rate &= ~((u16)0x2);
2353 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2356 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2357 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2358 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2359 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2361 lq_sta->is_vht = false;
2363 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2364 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2365 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2366 if (i == IWL_RATE_9M_INDEX)
2369 lq_sta->active_siso_rate |= BIT(i);
2373 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2374 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2375 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2376 if (i == IWL_RATE_9M_INDEX)
2379 lq_sta->active_mimo2_rate |= BIT(i);
2383 /* TODO: avoid MCS9 in 20Mhz which isn't valid for 11ac */
2384 lq_sta->is_vht = true;
2388 "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
2389 lq_sta->active_siso_rate,
2390 lq_sta->active_mimo2_rate,
2393 /* These values will be overridden later */
2394 lq_sta->lq.single_stream_ant_msk =
2395 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2396 lq_sta->lq.dual_stream_ant_msk =
2397 iwl_fw_valid_tx_ant(mvm->fw) &
2398 ~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2399 if (!lq_sta->lq.dual_stream_ant_msk) {
2400 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2401 } else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
2402 lq_sta->lq.dual_stream_ant_msk =
2403 iwl_fw_valid_tx_ant(mvm->fw);
2406 /* as default allow aggregation for all tids */
2407 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2410 /* Set last_txrate_idx to lowest rate */
2411 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2412 if (sband->band == IEEE80211_BAND_5GHZ)
2413 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2415 #ifdef CONFIG_MAC80211_DEBUGFS
2416 lq_sta->dbg_fixed_rate = 0;
2419 rs_initialize_lq(mvm, sta, lq_sta, band);
2422 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2423 struct ieee80211_sta *sta,
2424 struct iwl_lq_sta *lq_sta, u32 new_rate)
2426 struct iwl_scale_tbl_info tbl_type;
2429 int repeat_rate = 0;
2430 u8 ant_toggle_cnt = 0;
2431 u8 use_ht_possible = 1;
2432 u8 valid_tx_ant = 0;
2433 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2435 /* Override starting rate (index 0) if needed for debug purposes */
2436 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2438 /* Interpret new_rate (rate_n_flags) */
2439 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2440 &tbl_type, &rate_idx);
2442 /* How many times should we repeat the initial rate? */
2443 if (is_legacy(tbl_type.lq_type)) {
2445 repeat_rate = IWL_NUMBER_TRY;
2447 repeat_rate = min(IWL_HT_NUMBER_TRY,
2448 LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2451 lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2453 /* Fill 1st table entry (index 0) */
2454 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2456 if (num_of_ant(tbl_type.ant_type) == 1)
2457 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2458 else if (num_of_ant(tbl_type.ant_type) == 2)
2459 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2460 /* otherwise we don't modify the existing value */
2465 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2467 /* Fill rest of rate table */
2468 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2469 /* Repeat initial/next rate.
2470 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2471 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2472 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2473 if (is_legacy(tbl_type.lq_type)) {
2474 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2477 rs_toggle_antenna(valid_tx_ant,
2478 &new_rate, &tbl_type))
2482 /* Override next rate if needed for debug purposes */
2483 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2485 /* Fill next table entry */
2486 lq_cmd->rs_table[index] =
2487 cpu_to_le32(new_rate);
2492 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2495 /* Indicate to uCode which entries might be MIMO.
2496 * If initial rate was MIMO, this will finally end up
2497 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2498 if (is_mimo(tbl_type.lq_type))
2499 lq_cmd->mimo_delim = index;
2502 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2505 /* How many times should we repeat the next rate? */
2506 if (is_legacy(tbl_type.lq_type)) {
2507 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2510 rs_toggle_antenna(valid_tx_ant,
2511 &new_rate, &tbl_type))
2514 repeat_rate = IWL_NUMBER_TRY;
2516 repeat_rate = IWL_HT_NUMBER_TRY;
2519 /* Don't allow HT rates after next pass.
2520 * rs_get_lower_rate() will change type to LQ_LEGACY_A
2523 use_ht_possible = 0;
2525 /* Override next rate if needed for debug purposes */
2526 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2528 /* Fill next table entry */
2529 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2535 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2536 lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2538 lq_cmd->agg_time_limit =
2539 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2542 lq_cmd->agg_time_limit =
2543 cpu_to_le16(iwl_mvm_bt_coex_agg_time_limit(mvm, sta));
2546 * overwrite if needed, pass aggregation time limit
2547 * to uCode in uSec - This is racy - but heh, at least it helps...
2549 if (mvm && le32_to_cpu(mvm->last_bt_notif.bt_activity_grading) >= 2)
2550 lq_cmd->agg_time_limit = cpu_to_le16(1200);
2553 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2557 /* rate scale requires free function to be implemented */
2558 static void rs_free(void *mvm_rate)
2563 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2566 struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2567 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2569 IWL_DEBUG_RATE(mvm, "enter\n");
2570 IWL_DEBUG_RATE(mvm, "leave\n");
2573 #ifdef CONFIG_MAC80211_DEBUGFS
2574 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2577 struct iwl_mvm *mvm;
2582 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2583 if (lq_sta->dbg_fixed_rate) {
2585 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2586 >> RATE_MCS_ANT_POS);
2587 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2588 *rate_n_flags = lq_sta->dbg_fixed_rate;
2589 IWL_DEBUG_RATE(mvm, "Fixed rate ON\n");
2591 lq_sta->dbg_fixed_rate = 0;
2593 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2594 ant_sel_tx, valid_tx_ant);
2595 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2598 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2602 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2603 const char __user *user_buf, size_t count, loff_t *ppos)
2605 struct iwl_lq_sta *lq_sta = file->private_data;
2606 struct iwl_mvm *mvm;
2613 memset(buf, 0, sizeof(buf));
2614 buf_size = min(count, sizeof(buf) - 1);
2615 if (copy_from_user(buf, user_buf, buf_size))
2618 if (sscanf(buf, "%x", &parsed_rate) == 1)
2619 lq_sta->dbg_fixed_rate = parsed_rate;
2621 lq_sta->dbg_fixed_rate = 0;
2623 rs_program_fix_rate(mvm, lq_sta);
2628 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2629 char __user *user_buf, size_t count, loff_t *ppos)
2637 struct iwl_lq_sta *lq_sta = file->private_data;
2638 struct iwl_mvm *mvm;
2639 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2642 buff = kmalloc(1024, GFP_KERNEL);
2646 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2647 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2648 lq_sta->total_failed, lq_sta->total_success,
2649 lq_sta->active_legacy_rate);
2650 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2651 lq_sta->dbg_fixed_rate);
2652 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2653 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2654 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2655 (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
2656 desc += sprintf(buff+desc, "lq type %s\n",
2657 (is_legacy(tbl->lq_type)) ? "legacy" :
2658 is_vht(tbl->lq_type) ? "VHT" : "HT");
2659 if (is_ht(tbl->lq_type)) {
2660 desc += sprintf(buff+desc, " %s",
2661 (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2662 desc += sprintf(buff+desc, " %s",
2663 (is_ht20(tbl)) ? "20MHz" :
2664 (is_ht40(tbl)) ? "40MHz" :
2665 (is_ht80(tbl)) ? "80Mhz" : "BAD BW");
2666 desc += sprintf(buff+desc, " %s %s\n",
2667 (tbl->is_SGI) ? "SGI" : "",
2668 (lq_sta->is_agg) ? "AGG on" : "");
2670 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2671 lq_sta->last_rate_n_flags);
2672 desc += sprintf(buff+desc,
2673 "general: flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2675 lq_sta->lq.mimo_delim,
2676 lq_sta->lq.single_stream_ant_msk,
2677 lq_sta->lq.dual_stream_ant_msk);
2679 desc += sprintf(buff+desc,
2680 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2681 le16_to_cpu(lq_sta->lq.agg_time_limit),
2682 lq_sta->lq.agg_disable_start_th,
2683 lq_sta->lq.agg_frame_cnt_limit);
2685 desc += sprintf(buff+desc,
2686 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2687 lq_sta->lq.initial_rate_index[0],
2688 lq_sta->lq.initial_rate_index[1],
2689 lq_sta->lq.initial_rate_index[2],
2690 lq_sta->lq.initial_rate_index[3]);
2692 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2693 index = iwl_hwrate_to_plcp_idx(
2694 le32_to_cpu(lq_sta->lq.rs_table[i]));
2695 if (is_legacy(tbl->lq_type)) {
2696 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2697 i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2698 iwl_rate_mcs[index].mbps);
2700 desc += sprintf(buff+desc,
2701 " rate[%d] 0x%X %smbps (%s)\n",
2702 i, le32_to_cpu(lq_sta->lq.rs_table[i]),
2703 iwl_rate_mcs[index].mbps,
2704 iwl_rate_mcs[index].mcs);
2708 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2713 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2714 .write = rs_sta_dbgfs_scale_table_write,
2715 .read = rs_sta_dbgfs_scale_table_read,
2716 .open = simple_open,
2717 .llseek = default_llseek,
2719 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2720 char __user *user_buf, size_t count, loff_t *ppos)
2726 struct iwl_scale_tbl_info *tbl;
2727 struct iwl_lq_sta *lq_sta = file->private_data;
2729 buff = kmalloc(1024, GFP_KERNEL);
2733 for (i = 0; i < LQ_SIZE; i++) {
2734 tbl = &(lq_sta->lq_info[i]);
2735 desc += sprintf(buff+desc,
2736 "%s type=%d SGI=%d BW=%s DUP=0\n"
2738 lq_sta->active_tbl == i ? "*" : "x",
2741 is_ht20(tbl) ? "20Mhz" :
2742 is_ht40(tbl) ? "40Mhz" :
2743 is_ht80(tbl) ? "80Mhz" : "ERR",
2745 for (j = 0; j < IWL_RATE_COUNT; j++) {
2746 desc += sprintf(buff+desc,
2747 "counter=%d success=%d %%=%d\n",
2748 tbl->win[j].counter,
2749 tbl->win[j].success_counter,
2750 tbl->win[j].success_ratio);
2753 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2758 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2759 .read = rs_sta_dbgfs_stats_table_read,
2760 .open = simple_open,
2761 .llseek = default_llseek,
2764 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2766 struct iwl_lq_sta *lq_sta = mvm_sta;
2767 lq_sta->rs_sta_dbgfs_scale_table_file =
2768 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2769 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2770 lq_sta->rs_sta_dbgfs_stats_table_file =
2771 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2772 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2773 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2774 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2775 &lq_sta->tx_agg_tid_en);
2778 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2780 struct iwl_lq_sta *lq_sta = mvm_sta;
2781 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2782 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2783 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2788 * Initialization of rate scaling information is done by driver after
2789 * the station is added. Since mac80211 calls this function before a
2790 * station is added we ignore it.
2792 static void rs_rate_init_stub(void *mvm_r,
2793 struct ieee80211_supported_band *sband,
2794 struct cfg80211_chan_def *chandef,
2795 struct ieee80211_sta *sta, void *mvm_sta)
2798 static struct rate_control_ops rs_mvm_ops = {
2801 .tx_status = rs_tx_status,
2802 .get_rate = rs_get_rate,
2803 .rate_init = rs_rate_init_stub,
2806 .alloc_sta = rs_alloc_sta,
2807 .free_sta = rs_free_sta,
2808 #ifdef CONFIG_MAC80211_DEBUGFS
2809 .add_sta_debugfs = rs_add_debugfs,
2810 .remove_sta_debugfs = rs_remove_debugfs,
2814 int iwl_mvm_rate_control_register(void)
2816 return ieee80211_rate_control_register(&rs_mvm_ops);
2819 void iwl_mvm_rate_control_unregister(void)
2821 ieee80211_rate_control_unregister(&rs_mvm_ops);
2825 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2826 * Tx protection, according to this rquest and previous requests,
2827 * and send the LQ command.
2828 * @mvmsta: The station
2829 * @enable: Enable Tx protection?
2831 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2834 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2836 lockdep_assert_held(&mvm->mutex);
2839 if (mvmsta->tx_protection == 0)
2840 lq->flags |= LQ_FLAG_SET_STA_TLC_RTS_MSK;
2841 mvmsta->tx_protection++;
2843 mvmsta->tx_protection--;
2844 if (mvmsta->tx_protection == 0)
2845 lq->flags &= ~LQ_FLAG_SET_STA_TLC_RTS_MSK;
2848 return iwl_mvm_send_lq_cmd(mvm, lq, CMD_ASYNC, false);