1 /******************************************************************************
3 * Copyright(c) 2005 - 2010 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 <linux/wireless.h>
31 #include <net/mac80211.h>
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
37 #include <linux/workqueue.h>
44 #define RS_NAME "iwl-agn-rs"
46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
54 /* max allowed rate miss before sync LQ cmd */
55 #define IWL_MISSED_RATE_MAX 15
56 /* max time to accum history 2 seconds */
57 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
59 static u8 rs_ht_to_legacy[] = {
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
63 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
64 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
65 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
66 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
69 static const u8 ant_toggle_lookup[] = {
70 /*ANT_NONE -> */ ANT_NONE,
73 /*ANT_AB -> */ ANT_BC,
75 /*ANT_AC -> */ ANT_AB,
76 /*ANT_BC -> */ ANT_AC,
77 /*ANT_ABC -> */ ANT_ABC,
80 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np) \
81 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \
82 IWL_RATE_SISO_##s##M_PLCP, \
83 IWL_RATE_MIMO2_##s##M_PLCP,\
84 IWL_RATE_MIMO3_##s##M_PLCP,\
85 IWL_RATE_##r##M_IEEE, \
86 IWL_RATE_##ip##M_INDEX, \
87 IWL_RATE_##in##M_INDEX, \
88 IWL_RATE_##rp##M_INDEX, \
89 IWL_RATE_##rn##M_INDEX, \
90 IWL_RATE_##pp##M_INDEX, \
91 IWL_RATE_##np##M_INDEX }
95 * rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
97 * If there isn't a valid next or previous rate then INV is used which
98 * maps to IWL_RATE_INVALID
101 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
102 IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2), /* 1mbps */
103 IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5), /* 2mbps */
104 IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11), /*5.5mbps */
105 IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
106 IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11), /* 6mbps */
107 IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11), /* 9mbps */
108 IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18), /* 12mbps */
109 IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24), /* 18mbps */
110 IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36), /* 24mbps */
111 IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48), /* 36mbps */
112 IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54), /* 48mbps */
113 IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
114 IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
115 /* FIXME:RS: ^^ should be INV (legacy) */
118 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
123 if (rate_n_flags & RATE_MCS_HT_MSK) {
124 idx = (rate_n_flags & 0xff);
126 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
127 idx = idx - IWL_RATE_MIMO3_6M_PLCP;
128 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
129 idx = idx - IWL_RATE_MIMO2_6M_PLCP;
131 idx += IWL_FIRST_OFDM_RATE;
132 /* skip 9M not supported in ht*/
133 if (idx >= IWL_RATE_9M_INDEX)
135 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
138 /* legacy rate format, search for match in table */
140 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
141 if (iwl_rates[idx].plcp == (rate_n_flags & 0xFF))
148 static void rs_rate_scale_perform(struct iwl_priv *priv,
150 struct ieee80211_sta *sta,
151 struct iwl_lq_sta *lq_sta);
152 static void rs_fill_link_cmd(struct iwl_priv *priv,
153 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
154 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
157 #ifdef CONFIG_MAC80211_DEBUGFS
158 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
159 u32 *rate_n_flags, int index);
161 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
162 u32 *rate_n_flags, int index)
167 * The following tables contain the expected throughput metrics for all rates
169 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
171 * where invalid entries are zeros.
173 * CCK rates are only valid in legacy table and will only be used in G
177 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
178 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
181 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
182 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
183 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
184 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
185 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
188 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
189 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
190 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
191 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
192 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
195 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
196 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
197 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
198 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
199 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
202 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
203 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
204 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
205 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
206 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
209 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
210 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
211 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
212 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
213 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
216 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
217 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
218 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
219 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
220 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
224 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
233 { "24", "16QAM 1/2"},
234 { "36", "16QAM 3/4"},
235 { "48", "64QAM 2/3"},
236 { "54", "64QAM 3/4"},
237 { "60", "64QAM 5/6"},
240 #define MCS_INDEX_PER_STREAM (8)
242 static inline u8 rs_extract_rate(u32 rate_n_flags)
244 return (u8)(rate_n_flags & 0xFF);
247 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
250 window->success_counter = 0;
251 window->success_ratio = IWL_INVALID_VALUE;
253 window->average_tpt = IWL_INVALID_VALUE;
257 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
259 return (ant_type & valid_antenna) == ant_type;
263 * removes the old data from the statistics. All data that is older than
264 * TID_MAX_TIME_DIFF, will be deleted.
266 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
268 /* The oldest age we want to keep */
269 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
271 while (tl->queue_count &&
272 (tl->time_stamp < oldest_time)) {
273 tl->total -= tl->packet_count[tl->head];
274 tl->packet_count[tl->head] = 0;
275 tl->time_stamp += TID_QUEUE_CELL_SPACING;
278 if (tl->head >= TID_QUEUE_MAX_SIZE)
284 * increment traffic load value for tid and also remove
285 * any old values if passed the certain time period
287 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
288 struct ieee80211_hdr *hdr)
290 u32 curr_time = jiffies_to_msecs(jiffies);
293 struct iwl_traffic_load *tl = NULL;
296 if (ieee80211_is_data_qos(hdr->frame_control)) {
297 u8 *qc = ieee80211_get_qos_ctl(hdr);
300 return MAX_TID_COUNT;
302 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
303 return MAX_TID_COUNT;
305 tl = &lq_data->load[tid];
307 curr_time -= curr_time % TID_ROUND_VALUE;
309 /* Happens only for the first packet. Initialize the data */
310 if (!(tl->queue_count)) {
312 tl->time_stamp = curr_time;
315 tl->packet_count[0] = 1;
316 return MAX_TID_COUNT;
319 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
320 index = time_diff / TID_QUEUE_CELL_SPACING;
322 /* The history is too long: remove data that is older than */
323 /* TID_MAX_TIME_DIFF */
324 if (index >= TID_QUEUE_MAX_SIZE)
325 rs_tl_rm_old_stats(tl, curr_time);
327 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
328 tl->packet_count[index] = tl->packet_count[index] + 1;
329 tl->total = tl->total + 1;
331 if ((index + 1) > tl->queue_count)
332 tl->queue_count = index + 1;
338 get the traffic load value for tid
340 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
342 u32 curr_time = jiffies_to_msecs(jiffies);
345 struct iwl_traffic_load *tl = NULL;
347 if (tid >= TID_MAX_LOAD_COUNT)
350 tl = &(lq_data->load[tid]);
352 curr_time -= curr_time % TID_ROUND_VALUE;
354 if (!(tl->queue_count))
357 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
358 index = time_diff / TID_QUEUE_CELL_SPACING;
360 /* The history is too long: remove data that is older than */
361 /* TID_MAX_TIME_DIFF */
362 if (index >= TID_QUEUE_MAX_SIZE)
363 rs_tl_rm_old_stats(tl, curr_time);
368 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
369 struct iwl_lq_sta *lq_data, u8 tid,
370 struct ieee80211_sta *sta)
376 * Don't create TX aggregation sessions when in high
377 * BT traffic, as they would just be disrupted by BT.
379 if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
380 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
381 priv->bt_traffic_load);
385 load = rs_tl_get_load(lq_data, tid);
387 if (load > IWL_AGG_LOAD_THRESHOLD) {
388 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
390 ret = ieee80211_start_tx_ba_session(sta, tid);
391 if (ret == -EAGAIN) {
393 * driver and mac80211 is out of sync
394 * this might be cause by reloading firmware
395 * stop the tx ba session here
397 IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
399 ieee80211_stop_tx_ba_session(sta, tid);
402 IWL_ERR(priv, "Aggregation not enabled for tid %d "
403 "because load = %u\n", tid, load);
408 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
409 struct iwl_lq_sta *lq_data,
410 struct ieee80211_sta *sta)
412 if (tid < TID_MAX_LOAD_COUNT)
413 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
415 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
416 tid, TID_MAX_LOAD_COUNT);
419 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
421 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
422 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
423 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
427 * Static function to get the expected throughput from an iwl_scale_tbl_info
428 * that wraps a NULL pointer check
430 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
432 if (tbl->expected_tpt)
433 return tbl->expected_tpt[rs_index];
438 * rs_collect_tx_data - Update the success/failure sliding window
440 * We keep a sliding window of the last 62 packets transmitted
441 * at this rate. window->data contains the bitmask of successful
444 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
445 int scale_index, int attempts, int successes)
447 struct iwl_rate_scale_data *window = NULL;
448 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
451 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
454 /* Select window for current tx bit rate */
455 window = &(tbl->win[scale_index]);
457 /* Get expected throughput */
458 tpt = get_expected_tpt(tbl, scale_index);
461 * Keep track of only the latest 62 tx frame attempts in this rate's
462 * history window; anything older isn't really relevant any more.
463 * If we have filled up the sliding window, drop the oldest attempt;
464 * if the oldest attempt (highest bit in bitmap) shows "success",
465 * subtract "1" from the success counter (this is the main reason
466 * we keep these bitmaps!).
468 while (attempts > 0) {
469 if (window->counter >= IWL_RATE_MAX_WINDOW) {
471 /* remove earliest */
472 window->counter = IWL_RATE_MAX_WINDOW - 1;
474 if (window->data & mask) {
475 window->data &= ~mask;
476 window->success_counter--;
480 /* Increment frames-attempted counter */
483 /* Shift bitmap by one frame to throw away oldest history */
486 /* Mark the most recent #successes attempts as successful */
488 window->success_counter++;
496 /* Calculate current success ratio, avoid divide-by-0! */
497 if (window->counter > 0)
498 window->success_ratio = 128 * (100 * window->success_counter)
501 window->success_ratio = IWL_INVALID_VALUE;
503 fail_count = window->counter - window->success_counter;
505 /* Calculate average throughput, if we have enough history. */
506 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
507 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
508 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
510 window->average_tpt = IWL_INVALID_VALUE;
512 /* Tag this window as having been updated */
513 window->stamp = jiffies;
519 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
521 /* FIXME:RS:remove this function and put the flags statically in the table */
522 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
523 struct iwl_scale_tbl_info *tbl,
524 int index, u8 use_green)
526 u32 rate_n_flags = 0;
528 if (is_legacy(tbl->lq_type)) {
529 rate_n_flags = iwl_rates[index].plcp;
530 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
531 rate_n_flags |= RATE_MCS_CCK_MSK;
533 } else if (is_Ht(tbl->lq_type)) {
534 if (index > IWL_LAST_OFDM_RATE) {
535 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
536 index = IWL_LAST_OFDM_RATE;
538 rate_n_flags = RATE_MCS_HT_MSK;
540 if (is_siso(tbl->lq_type))
541 rate_n_flags |= iwl_rates[index].plcp_siso;
542 else if (is_mimo2(tbl->lq_type))
543 rate_n_flags |= iwl_rates[index].plcp_mimo2;
545 rate_n_flags |= iwl_rates[index].plcp_mimo3;
547 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
550 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
551 RATE_MCS_ANT_ABC_MSK);
553 if (is_Ht(tbl->lq_type)) {
556 rate_n_flags |= RATE_MCS_DUP_MSK;
558 rate_n_flags |= RATE_MCS_HT40_MSK;
561 rate_n_flags |= RATE_MCS_SGI_MSK;
564 rate_n_flags |= RATE_MCS_GF_MSK;
565 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
566 rate_n_flags &= ~RATE_MCS_SGI_MSK;
567 IWL_ERR(priv, "GF was set with SGI:SISO\n");
575 * Interpret uCode API's rate_n_flags format,
576 * fill "search" or "active" tx mode table.
578 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
579 enum ieee80211_band band,
580 struct iwl_scale_tbl_info *tbl,
583 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
584 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
587 memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
588 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
590 if (*rate_idx == IWL_RATE_INVALID) {
594 tbl->is_SGI = 0; /* default legacy setup */
597 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
598 tbl->lq_type = LQ_NONE;
599 tbl->max_search = IWL_MAX_SEARCH;
601 /* legacy rate format */
602 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
603 if (num_of_ant == 1) {
604 if (band == IEEE80211_BAND_5GHZ)
611 if (rate_n_flags & RATE_MCS_SGI_MSK)
614 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
615 (rate_n_flags & RATE_MCS_DUP_MSK))
618 if (rate_n_flags & RATE_MCS_DUP_MSK)
621 mcs = rs_extract_rate(rate_n_flags);
624 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
626 tbl->lq_type = LQ_SISO; /*else NONE*/
628 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
630 tbl->lq_type = LQ_MIMO2;
633 if (num_of_ant == 3) {
634 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
635 tbl->lq_type = LQ_MIMO3;
642 /* switch to another antenna/antennas and return 1 */
643 /* if no other valid antenna found, return 0 */
644 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
645 struct iwl_scale_tbl_info *tbl)
649 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
652 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
655 new_ant_type = ant_toggle_lookup[tbl->ant_type];
657 while ((new_ant_type != tbl->ant_type) &&
658 !rs_is_valid_ant(valid_ant, new_ant_type))
659 new_ant_type = ant_toggle_lookup[new_ant_type];
661 if (new_ant_type == tbl->ant_type)
664 tbl->ant_type = new_ant_type;
665 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
666 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
671 * Green-field mode is valid if the station supports it and
672 * there are no non-GF stations present in the BSS.
674 static bool rs_use_green(struct ieee80211_sta *sta)
676 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
677 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
679 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
680 !(ctx->ht.non_gf_sta_present);
684 * rs_get_supported_rates - get the available rates
686 * if management frame or broadcast frame only return
687 * basic available rates.
690 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
691 struct ieee80211_hdr *hdr,
692 enum iwl_table_type rate_type)
694 if (is_legacy(rate_type)) {
695 return lq_sta->active_legacy_rate;
697 if (is_siso(rate_type))
698 return lq_sta->active_siso_rate;
699 else if (is_mimo2(rate_type))
700 return lq_sta->active_mimo2_rate;
702 return lq_sta->active_mimo3_rate;
706 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
709 u8 high = IWL_RATE_INVALID;
710 u8 low = IWL_RATE_INVALID;
712 /* 802.11A or ht walks to the next literal adjacent rate in
714 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
718 /* Find the previous rate that is in the rate mask */
720 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
721 if (rate_mask & mask) {
727 /* Find the next rate that is in the rate mask */
729 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
730 if (rate_mask & mask) {
736 return (high << 8) | low;
740 while (low != IWL_RATE_INVALID) {
741 low = iwl_rates[low].prev_rs;
742 if (low == IWL_RATE_INVALID)
744 if (rate_mask & (1 << low))
746 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
750 while (high != IWL_RATE_INVALID) {
751 high = iwl_rates[high].next_rs;
752 if (high == IWL_RATE_INVALID)
754 if (rate_mask & (1 << high))
756 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
759 return (high << 8) | low;
762 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
763 struct iwl_scale_tbl_info *tbl,
764 u8 scale_index, u8 ht_possible)
769 u8 switch_to_legacy = 0;
770 u8 is_green = lq_sta->is_green;
771 struct iwl_priv *priv = lq_sta->drv;
773 /* check if we need to switch from HT to legacy rates.
774 * assumption is that mandatory rates (1Mbps or 6Mbps)
775 * are always supported (spec demand) */
776 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
777 switch_to_legacy = 1;
778 scale_index = rs_ht_to_legacy[scale_index];
779 if (lq_sta->band == IEEE80211_BAND_5GHZ)
784 if (num_of_ant(tbl->ant_type) > 1)
786 first_antenna(priv->hw_params.valid_tx_ant);
790 tbl->max_search = IWL_MAX_SEARCH;
793 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
795 /* Mask with station rate restriction */
796 if (is_legacy(tbl->lq_type)) {
797 /* supp_rates has no CCK bits in A mode */
798 if (lq_sta->band == IEEE80211_BAND_5GHZ)
799 rate_mask = (u16)(rate_mask &
800 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
802 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
805 /* If we switched from HT to legacy, check current rate */
806 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
811 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
813 low = high_low & 0xff;
815 if (low == IWL_RATE_INVALID)
819 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
823 * Simple function to compare two rate scale table types
825 static bool table_type_matches(struct iwl_scale_tbl_info *a,
826 struct iwl_scale_tbl_info *b)
828 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
829 (a->is_SGI == b->is_SGI);
832 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
833 struct iwl_lq_sta *lq_sta)
835 struct iwl_scale_tbl_info *tbl;
836 bool full_concurrent;
839 spin_lock_irqsave(&priv->lock, flags);
840 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
841 full_concurrent = true;
843 full_concurrent = false;
844 spin_unlock_irqrestore(&priv->lock, flags);
846 if (priv->bt_full_concurrent != full_concurrent) {
847 priv->bt_full_concurrent = full_concurrent;
849 /* Update uCode's rate table. */
850 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
851 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
852 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
854 queue_work(priv->workqueue, &priv->bt_full_concurrency);
859 * mac80211 sends us Tx status
861 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
862 struct ieee80211_sta *sta, void *priv_sta,
867 int rs_index, mac_index, i;
868 struct iwl_lq_sta *lq_sta = priv_sta;
869 struct iwl_link_quality_cmd *table;
870 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
871 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
872 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
873 enum mac80211_rate_control_flags mac_flags;
875 struct iwl_scale_tbl_info tbl_type;
876 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
877 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
878 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
880 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
882 /* Treat uninitialized rate scaling data same as non-existing. */
884 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
886 } else if (!lq_sta->drv) {
887 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
891 if (!ieee80211_is_data(hdr->frame_control) ||
892 info->flags & IEEE80211_TX_CTL_NO_ACK)
895 /* This packet was aggregated but doesn't carry status info */
896 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
897 !(info->flags & IEEE80211_TX_STAT_AMPDU))
901 * Ignore this Tx frame response if its initial rate doesn't match
902 * that of latest Link Quality command. There may be stragglers
903 * from a previous Link Quality command, but we're no longer interested
904 * in those; they're either from the "active" mode while we're trying
905 * to check "search" mode, or a prior "search" mode after we've moved
906 * to a new "search" mode (which might become the new "active" mode).
909 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
910 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
911 if (priv->band == IEEE80211_BAND_5GHZ)
912 rs_index -= IWL_FIRST_OFDM_RATE;
913 mac_flags = info->status.rates[0].flags;
914 mac_index = info->status.rates[0].idx;
915 /* For HT packets, map MCS to PLCP */
916 if (mac_flags & IEEE80211_TX_RC_MCS) {
917 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
918 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
921 * mac80211 HT index is always zero-indexed; we need to move
922 * HT OFDM rates after CCK rates in 2.4 GHz band
924 if (priv->band == IEEE80211_BAND_2GHZ)
925 mac_index += IWL_FIRST_OFDM_RATE;
927 /* Here we actually compare this rate to the latest LQ command */
928 if ((mac_index < 0) ||
929 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
930 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
931 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
932 (tbl_type.ant_type != info->antenna_sel_tx) ||
933 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
934 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
935 (rs_index != mac_index)) {
936 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
938 * Since rates mis-match, the last LQ command may have failed.
939 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
942 lq_sta->missed_rate_counter++;
943 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
944 lq_sta->missed_rate_counter = 0;
945 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
947 /* Regardless, ignore this status info for outdated rate */
950 /* Rate did match, so reset the missed_rate_counter */
951 lq_sta->missed_rate_counter = 0;
953 /* Figure out if rate scale algorithm is in active or search table */
954 if (table_type_matches(&tbl_type,
955 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
956 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
957 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
958 } else if (table_type_matches(&tbl_type,
959 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
960 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
961 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
963 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
964 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
965 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
966 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
967 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
968 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
969 tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
970 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
971 tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
973 * no matching table found, let's by-pass the data collection
974 * and continue to perform rate scale to find the rate table
976 rs_stay_in_table(lq_sta, true);
981 * Updating the frame history depends on whether packets were
984 * For aggregation, all packets were transmitted at the same rate, the
985 * first index into rate scale table.
987 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
988 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
989 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
991 rs_collect_tx_data(curr_tbl, rs_index,
992 info->status.ampdu_len,
993 info->status.ampdu_ack_len);
995 /* Update success/fail counts if not searching for new mode */
996 if (lq_sta->stay_in_tbl) {
997 lq_sta->total_success += info->status.ampdu_ack_len;
998 lq_sta->total_failed += (info->status.ampdu_len -
999 info->status.ampdu_ack_len);
1003 * For legacy, update frame history with for each Tx retry.
1005 retries = info->status.rates[0].count - 1;
1006 /* HW doesn't send more than 15 retries */
1007 retries = min(retries, 15);
1009 /* The last transmission may have been successful */
1010 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1011 /* Collect data for each rate used during failed TX attempts */
1012 for (i = 0; i <= retries; ++i) {
1013 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1014 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1015 &tbl_type, &rs_index);
1017 * Only collect stats if retried rate is in the same RS
1018 * table as active/search.
1020 if (table_type_matches(&tbl_type, curr_tbl))
1022 else if (table_type_matches(&tbl_type, other_tbl))
1023 tmp_tbl = other_tbl;
1026 rs_collect_tx_data(tmp_tbl, rs_index, 1,
1027 i < retries ? 0 : legacy_success);
1030 /* Update success/fail counts if not searching for new mode */
1031 if (lq_sta->stay_in_tbl) {
1032 lq_sta->total_success += legacy_success;
1033 lq_sta->total_failed += retries + (1 - legacy_success);
1036 /* The last TX rate is cached in lq_sta; it's set in if/else above */
1037 lq_sta->last_rate_n_flags = tx_rate;
1039 /* See if there's a better rate or modulation mode to try. */
1040 if (sta && sta->supp_rates[sband->band])
1041 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1043 /* Is there a need to switch between full concurrency and 3-wire? */
1044 if (priv->bt_ant_couple_ok)
1045 rs_bt_update_lq(priv, ctx, lq_sta);
1049 * Begin a period of staying with a selected modulation mode.
1050 * Set "stay_in_tbl" flag to prevent any mode switches.
1051 * Set frame tx success limits according to legacy vs. high-throughput,
1052 * and reset overall (spanning all rates) tx success history statistics.
1053 * These control how long we stay using same modulation mode before
1054 * searching for a new mode.
1056 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1057 struct iwl_lq_sta *lq_sta)
1059 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1060 lq_sta->stay_in_tbl = 1; /* only place this gets set */
1062 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1063 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1064 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1066 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1067 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1068 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1070 lq_sta->table_count = 0;
1071 lq_sta->total_failed = 0;
1072 lq_sta->total_success = 0;
1073 lq_sta->flush_timer = jiffies;
1074 lq_sta->action_counter = 0;
1078 * Find correct throughput table for given mode of modulation
1080 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1081 struct iwl_scale_tbl_info *tbl)
1083 /* Used to choose among HT tables */
1084 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1086 /* Check for invalid LQ type */
1087 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1088 tbl->expected_tpt = expected_tpt_legacy;
1092 /* Legacy rates have only one table */
1093 if (is_legacy(tbl->lq_type)) {
1094 tbl->expected_tpt = expected_tpt_legacy;
1098 /* Choose among many HT tables depending on number of streams
1099 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1101 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1102 ht_tbl_pointer = expected_tpt_siso20MHz;
1103 else if (is_siso(tbl->lq_type))
1104 ht_tbl_pointer = expected_tpt_siso40MHz;
1105 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1106 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1107 else if (is_mimo2(tbl->lq_type))
1108 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1109 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1110 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1111 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1112 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1114 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
1115 tbl->expected_tpt = ht_tbl_pointer[0];
1116 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
1117 tbl->expected_tpt = ht_tbl_pointer[1];
1118 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
1119 tbl->expected_tpt = ht_tbl_pointer[2];
1121 tbl->expected_tpt = ht_tbl_pointer[3];
1125 * Find starting rate for new "search" high-throughput mode of modulation.
1126 * Goal is to find lowest expected rate (under perfect conditions) that is
1127 * above the current measured throughput of "active" mode, to give new mode
1128 * a fair chance to prove itself without too many challenges.
1130 * This gets called when transitioning to more aggressive modulation
1131 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1132 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1133 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1134 * bit rate will typically need to increase, but not if performance was bad.
1136 static s32 rs_get_best_rate(struct iwl_priv *priv,
1137 struct iwl_lq_sta *lq_sta,
1138 struct iwl_scale_tbl_info *tbl, /* "search" */
1139 u16 rate_mask, s8 index)
1141 /* "active" values */
1142 struct iwl_scale_tbl_info *active_tbl =
1143 &(lq_sta->lq_info[lq_sta->active_tbl]);
1144 s32 active_sr = active_tbl->win[index].success_ratio;
1145 s32 active_tpt = active_tbl->expected_tpt[index];
1147 /* expected "search" throughput */
1148 s32 *tpt_tbl = tbl->expected_tpt;
1150 s32 new_rate, high, low, start_hi;
1154 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1157 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1160 low = high_low & 0xff;
1161 high = (high_low >> 8) & 0xff;
1164 * Lower the "search" bit rate, to give new "search" mode
1165 * approximately the same throughput as "active" if:
1167 * 1) "Active" mode has been working modestly well (but not
1168 * great), and expected "search" throughput (under perfect
1169 * conditions) at candidate rate is above the actual
1170 * measured "active" throughput (but less than expected
1171 * "active" throughput under perfect conditions).
1173 * 2) "Active" mode has been working perfectly or very well
1174 * and expected "search" throughput (under perfect
1175 * conditions) at candidate rate is above expected
1176 * "active" throughput (under perfect conditions).
1178 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1179 ((active_sr > IWL_RATE_DECREASE_TH) &&
1180 (active_sr <= IWL_RATE_HIGH_TH) &&
1181 (tpt_tbl[rate] <= active_tpt))) ||
1182 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1183 (tpt_tbl[rate] > active_tpt))) {
1185 /* (2nd or later pass)
1186 * If we've already tried to raise the rate, and are
1187 * now trying to lower it, use the higher rate. */
1188 if (start_hi != IWL_RATE_INVALID) {
1189 new_rate = start_hi;
1195 /* Loop again with lower rate */
1196 if (low != IWL_RATE_INVALID)
1199 /* Lower rate not available, use the original */
1203 /* Else try to raise the "search" rate to match "active" */
1205 /* (2nd or later pass)
1206 * If we've already tried to lower the rate, and are
1207 * now trying to raise it, use the lower rate. */
1208 if (new_rate != IWL_RATE_INVALID)
1211 /* Loop again with higher rate */
1212 else if (high != IWL_RATE_INVALID) {
1216 /* Higher rate not available, use the original */
1228 * Set up search table for MIMO2
1230 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1231 struct iwl_lq_sta *lq_sta,
1232 struct ieee80211_conf *conf,
1233 struct ieee80211_sta *sta,
1234 struct iwl_scale_tbl_info *tbl, int index)
1238 s8 is_green = lq_sta->is_green;
1239 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1240 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1242 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1245 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1246 == WLAN_HT_CAP_SM_PS_STATIC)
1249 /* Need both Tx chains/antennas to support MIMO */
1250 if (priv->hw_params.tx_chains_num < 2)
1253 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1255 tbl->lq_type = LQ_MIMO2;
1256 tbl->is_dup = lq_sta->is_dup;
1258 tbl->max_search = IWL_MAX_SEARCH;
1259 rate_mask = lq_sta->active_mimo2_rate;
1261 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1266 rs_set_expected_tpt_table(lq_sta, tbl);
1268 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1270 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1271 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1272 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1276 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1278 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1279 tbl->current_rate, is_green);
1284 * Set up search table for MIMO3
1286 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1287 struct iwl_lq_sta *lq_sta,
1288 struct ieee80211_conf *conf,
1289 struct ieee80211_sta *sta,
1290 struct iwl_scale_tbl_info *tbl, int index)
1294 s8 is_green = lq_sta->is_green;
1295 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1296 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1298 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1301 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1302 == WLAN_HT_CAP_SM_PS_STATIC)
1305 /* Need both Tx chains/antennas to support MIMO */
1306 if (priv->hw_params.tx_chains_num < 3)
1309 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1311 tbl->lq_type = LQ_MIMO3;
1312 tbl->is_dup = lq_sta->is_dup;
1314 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1315 rate_mask = lq_sta->active_mimo3_rate;
1317 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1322 rs_set_expected_tpt_table(lq_sta, tbl);
1324 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1326 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1328 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1329 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1333 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1335 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1336 tbl->current_rate, is_green);
1341 * Set up search table for SISO
1343 static int rs_switch_to_siso(struct iwl_priv *priv,
1344 struct iwl_lq_sta *lq_sta,
1345 struct ieee80211_conf *conf,
1346 struct ieee80211_sta *sta,
1347 struct iwl_scale_tbl_info *tbl, int index)
1350 u8 is_green = lq_sta->is_green;
1352 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1353 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1355 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1358 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1360 tbl->is_dup = lq_sta->is_dup;
1361 tbl->lq_type = LQ_SISO;
1363 tbl->max_search = IWL_MAX_SEARCH;
1364 rate_mask = lq_sta->active_siso_rate;
1366 if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1372 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1374 rs_set_expected_tpt_table(lq_sta, tbl);
1375 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1377 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1378 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1379 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1383 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1384 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1385 tbl->current_rate, is_green);
1390 * Try to switch to new modulation mode from legacy
1392 static int rs_move_legacy_other(struct iwl_priv *priv,
1393 struct iwl_lq_sta *lq_sta,
1394 struct ieee80211_conf *conf,
1395 struct ieee80211_sta *sta,
1398 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1399 struct iwl_scale_tbl_info *search_tbl =
1400 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1401 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1402 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1403 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1405 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1406 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1408 u8 update_search_tbl_counter = 0;
1410 switch (priv->bt_traffic_load) {
1411 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1414 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1415 /* avoid antenna B unless MIMO */
1416 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1417 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1418 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1420 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1421 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1422 /* avoid antenna B and MIMO */
1423 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1424 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1425 tbl->action != IWL_LEGACY_SWITCH_SISO)
1426 tbl->action = IWL_LEGACY_SWITCH_SISO;
1429 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1433 if (!iwl_ht_enabled(priv))
1434 /* stay in Legacy */
1435 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1436 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1437 tbl->action > IWL_LEGACY_SWITCH_SISO)
1438 tbl->action = IWL_LEGACY_SWITCH_SISO;
1440 /* configure as 1x1 if bt full concurrency */
1441 if (priv->bt_full_concurrent) {
1442 if (!iwl_ht_enabled(priv))
1443 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1444 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1445 tbl->action = IWL_LEGACY_SWITCH_SISO;
1446 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1449 start_action = tbl->action;
1451 lq_sta->action_counter++;
1452 switch (tbl->action) {
1453 case IWL_LEGACY_SWITCH_ANTENNA1:
1454 case IWL_LEGACY_SWITCH_ANTENNA2:
1455 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1457 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1458 tx_chains_num <= 1) ||
1459 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1460 tx_chains_num <= 2))
1463 /* Don't change antenna if success has been great */
1464 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1465 !priv->bt_full_concurrent &&
1466 priv->bt_traffic_load ==
1467 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1470 /* Set up search table to try other antenna */
1471 memcpy(search_tbl, tbl, sz);
1473 if (rs_toggle_antenna(valid_tx_ant,
1474 &search_tbl->current_rate, search_tbl)) {
1475 update_search_tbl_counter = 1;
1476 rs_set_expected_tpt_table(lq_sta, search_tbl);
1480 case IWL_LEGACY_SWITCH_SISO:
1481 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1483 /* Set up search table to try SISO */
1484 memcpy(search_tbl, tbl, sz);
1485 search_tbl->is_SGI = 0;
1486 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1489 lq_sta->action_counter = 0;
1494 case IWL_LEGACY_SWITCH_MIMO2_AB:
1495 case IWL_LEGACY_SWITCH_MIMO2_AC:
1496 case IWL_LEGACY_SWITCH_MIMO2_BC:
1497 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1499 /* Set up search table to try MIMO */
1500 memcpy(search_tbl, tbl, sz);
1501 search_tbl->is_SGI = 0;
1503 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1504 search_tbl->ant_type = ANT_AB;
1505 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1506 search_tbl->ant_type = ANT_AC;
1508 search_tbl->ant_type = ANT_BC;
1510 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1513 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1516 lq_sta->action_counter = 0;
1521 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1522 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1524 /* Set up search table to try MIMO3 */
1525 memcpy(search_tbl, tbl, sz);
1526 search_tbl->is_SGI = 0;
1528 search_tbl->ant_type = ANT_ABC;
1530 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1533 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1536 lq_sta->action_counter = 0;
1542 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1543 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1545 if (tbl->action == start_action)
1549 search_tbl->lq_type = LQ_NONE;
1553 lq_sta->search_better_tbl = 1;
1555 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1556 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1557 if (update_search_tbl_counter)
1558 search_tbl->action = tbl->action;
1564 * Try to switch to new modulation mode from SISO
1566 static int rs_move_siso_to_other(struct iwl_priv *priv,
1567 struct iwl_lq_sta *lq_sta,
1568 struct ieee80211_conf *conf,
1569 struct ieee80211_sta *sta, int index)
1571 u8 is_green = lq_sta->is_green;
1572 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1573 struct iwl_scale_tbl_info *search_tbl =
1574 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1575 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1576 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1577 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1578 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1580 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1581 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1582 u8 update_search_tbl_counter = 0;
1585 switch (priv->bt_traffic_load) {
1586 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1589 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1590 /* avoid antenna B unless MIMO */
1591 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1592 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1593 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1595 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1596 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1597 /* avoid antenna B and MIMO */
1598 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1599 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1600 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1603 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1607 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1608 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1610 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1613 /* configure as 1x1 if bt full concurrency */
1614 if (priv->bt_full_concurrent) {
1615 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1616 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1617 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1620 start_action = tbl->action;
1622 lq_sta->action_counter++;
1623 switch (tbl->action) {
1624 case IWL_SISO_SWITCH_ANTENNA1:
1625 case IWL_SISO_SWITCH_ANTENNA2:
1626 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1627 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1628 tx_chains_num <= 1) ||
1629 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1630 tx_chains_num <= 2))
1633 if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1634 !priv->bt_full_concurrent &&
1635 priv->bt_traffic_load ==
1636 IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1639 memcpy(search_tbl, tbl, sz);
1640 if (rs_toggle_antenna(valid_tx_ant,
1641 &search_tbl->current_rate, search_tbl)) {
1642 update_search_tbl_counter = 1;
1646 case IWL_SISO_SWITCH_MIMO2_AB:
1647 case IWL_SISO_SWITCH_MIMO2_AC:
1648 case IWL_SISO_SWITCH_MIMO2_BC:
1649 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1650 memcpy(search_tbl, tbl, sz);
1651 search_tbl->is_SGI = 0;
1653 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1654 search_tbl->ant_type = ANT_AB;
1655 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1656 search_tbl->ant_type = ANT_AC;
1658 search_tbl->ant_type = ANT_BC;
1660 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1663 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1668 case IWL_SISO_SWITCH_GI:
1669 if (!tbl->is_ht40 && !(ht_cap->cap &
1670 IEEE80211_HT_CAP_SGI_20))
1672 if (tbl->is_ht40 && !(ht_cap->cap &
1673 IEEE80211_HT_CAP_SGI_40))
1676 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1678 memcpy(search_tbl, tbl, sz);
1684 "SGI was set in GF+SISO\n");
1686 search_tbl->is_SGI = !tbl->is_SGI;
1687 rs_set_expected_tpt_table(lq_sta, search_tbl);
1689 s32 tpt = lq_sta->last_tpt / 100;
1690 if (tpt >= search_tbl->expected_tpt[index])
1693 search_tbl->current_rate =
1694 rate_n_flags_from_tbl(priv, search_tbl,
1696 update_search_tbl_counter = 1;
1698 case IWL_SISO_SWITCH_MIMO3_ABC:
1699 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1700 memcpy(search_tbl, tbl, sz);
1701 search_tbl->is_SGI = 0;
1702 search_tbl->ant_type = ANT_ABC;
1704 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1707 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1714 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1715 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1717 if (tbl->action == start_action)
1720 search_tbl->lq_type = LQ_NONE;
1724 lq_sta->search_better_tbl = 1;
1726 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1727 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1728 if (update_search_tbl_counter)
1729 search_tbl->action = tbl->action;
1735 * Try to switch to new modulation mode from MIMO2
1737 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1738 struct iwl_lq_sta *lq_sta,
1739 struct ieee80211_conf *conf,
1740 struct ieee80211_sta *sta, int index)
1742 s8 is_green = lq_sta->is_green;
1743 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1744 struct iwl_scale_tbl_info *search_tbl =
1745 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1746 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1747 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1748 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1749 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1751 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1752 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1753 u8 update_search_tbl_counter = 0;
1756 switch (priv->bt_traffic_load) {
1757 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1760 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1761 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1762 /* avoid antenna B and MIMO */
1763 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1764 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1766 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1767 /* avoid antenna B unless MIMO */
1768 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1769 tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1770 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1773 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1777 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1778 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1779 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1780 /* switch in SISO */
1781 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1784 /* configure as 1x1 if bt full concurrency */
1785 if (priv->bt_full_concurrent &&
1786 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1787 tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1788 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1790 start_action = tbl->action;
1792 lq_sta->action_counter++;
1793 switch (tbl->action) {
1794 case IWL_MIMO2_SWITCH_ANTENNA1:
1795 case IWL_MIMO2_SWITCH_ANTENNA2:
1796 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1798 if (tx_chains_num <= 2)
1801 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1804 memcpy(search_tbl, tbl, sz);
1805 if (rs_toggle_antenna(valid_tx_ant,
1806 &search_tbl->current_rate, search_tbl)) {
1807 update_search_tbl_counter = 1;
1811 case IWL_MIMO2_SWITCH_SISO_A:
1812 case IWL_MIMO2_SWITCH_SISO_B:
1813 case IWL_MIMO2_SWITCH_SISO_C:
1814 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1816 /* Set up new search table for SISO */
1817 memcpy(search_tbl, tbl, sz);
1819 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1820 search_tbl->ant_type = ANT_A;
1821 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1822 search_tbl->ant_type = ANT_B;
1824 search_tbl->ant_type = ANT_C;
1826 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1829 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1836 case IWL_MIMO2_SWITCH_GI:
1837 if (!tbl->is_ht40 && !(ht_cap->cap &
1838 IEEE80211_HT_CAP_SGI_20))
1840 if (tbl->is_ht40 && !(ht_cap->cap &
1841 IEEE80211_HT_CAP_SGI_40))
1844 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1846 /* Set up new search table for MIMO2 */
1847 memcpy(search_tbl, tbl, sz);
1848 search_tbl->is_SGI = !tbl->is_SGI;
1849 rs_set_expected_tpt_table(lq_sta, search_tbl);
1851 * If active table already uses the fastest possible
1852 * modulation (dual stream with short guard interval),
1853 * and it's working well, there's no need to look
1854 * for a better type of modulation!
1857 s32 tpt = lq_sta->last_tpt / 100;
1858 if (tpt >= search_tbl->expected_tpt[index])
1861 search_tbl->current_rate =
1862 rate_n_flags_from_tbl(priv, search_tbl,
1864 update_search_tbl_counter = 1;
1867 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1868 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1869 memcpy(search_tbl, tbl, sz);
1870 search_tbl->is_SGI = 0;
1871 search_tbl->ant_type = ANT_ABC;
1873 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1876 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1884 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1885 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1887 if (tbl->action == start_action)
1890 search_tbl->lq_type = LQ_NONE;
1893 lq_sta->search_better_tbl = 1;
1895 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1896 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1897 if (update_search_tbl_counter)
1898 search_tbl->action = tbl->action;
1905 * Try to switch to new modulation mode from MIMO3
1907 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1908 struct iwl_lq_sta *lq_sta,
1909 struct ieee80211_conf *conf,
1910 struct ieee80211_sta *sta, int index)
1912 s8 is_green = lq_sta->is_green;
1913 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1914 struct iwl_scale_tbl_info *search_tbl =
1915 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1916 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1917 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1918 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1919 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1921 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1922 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1924 u8 update_search_tbl_counter = 0;
1926 switch (priv->bt_traffic_load) {
1927 case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1930 case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1931 case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1932 /* avoid antenna B and MIMO */
1933 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1934 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1936 case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1937 /* avoid antenna B unless MIMO */
1938 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1939 tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1940 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1943 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1947 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1948 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1949 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1950 /* switch in SISO */
1951 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1954 /* configure as 1x1 if bt full concurrency */
1955 if (priv->bt_full_concurrent &&
1956 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1957 tbl->action > IWL_MIMO3_SWITCH_SISO_C))
1958 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1960 start_action = tbl->action;
1962 lq_sta->action_counter++;
1963 switch (tbl->action) {
1964 case IWL_MIMO3_SWITCH_ANTENNA1:
1965 case IWL_MIMO3_SWITCH_ANTENNA2:
1966 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1968 if (tx_chains_num <= 3)
1971 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1974 memcpy(search_tbl, tbl, sz);
1975 if (rs_toggle_antenna(valid_tx_ant,
1976 &search_tbl->current_rate, search_tbl))
1979 case IWL_MIMO3_SWITCH_SISO_A:
1980 case IWL_MIMO3_SWITCH_SISO_B:
1981 case IWL_MIMO3_SWITCH_SISO_C:
1982 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1984 /* Set up new search table for SISO */
1985 memcpy(search_tbl, tbl, sz);
1987 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1988 search_tbl->ant_type = ANT_A;
1989 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1990 search_tbl->ant_type = ANT_B;
1992 search_tbl->ant_type = ANT_C;
1994 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1997 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2004 case IWL_MIMO3_SWITCH_MIMO2_AB:
2005 case IWL_MIMO3_SWITCH_MIMO2_AC:
2006 case IWL_MIMO3_SWITCH_MIMO2_BC:
2007 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2009 memcpy(search_tbl, tbl, sz);
2010 search_tbl->is_SGI = 0;
2011 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2012 search_tbl->ant_type = ANT_AB;
2013 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2014 search_tbl->ant_type = ANT_AC;
2016 search_tbl->ant_type = ANT_BC;
2018 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2021 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2028 case IWL_MIMO3_SWITCH_GI:
2029 if (!tbl->is_ht40 && !(ht_cap->cap &
2030 IEEE80211_HT_CAP_SGI_20))
2032 if (tbl->is_ht40 && !(ht_cap->cap &
2033 IEEE80211_HT_CAP_SGI_40))
2036 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2038 /* Set up new search table for MIMO */
2039 memcpy(search_tbl, tbl, sz);
2040 search_tbl->is_SGI = !tbl->is_SGI;
2041 rs_set_expected_tpt_table(lq_sta, search_tbl);
2043 * If active table already uses the fastest possible
2044 * modulation (dual stream with short guard interval),
2045 * and it's working well, there's no need to look
2046 * for a better type of modulation!
2049 s32 tpt = lq_sta->last_tpt / 100;
2050 if (tpt >= search_tbl->expected_tpt[index])
2053 search_tbl->current_rate =
2054 rate_n_flags_from_tbl(priv, search_tbl,
2056 update_search_tbl_counter = 1;
2060 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2061 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2063 if (tbl->action == start_action)
2066 search_tbl->lq_type = LQ_NONE;
2069 lq_sta->search_better_tbl = 1;
2071 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2072 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2073 if (update_search_tbl_counter)
2074 search_tbl->action = tbl->action;
2081 * Check whether we should continue using same modulation mode, or
2082 * begin search for a new mode, based on:
2083 * 1) # tx successes or failures while using this mode
2084 * 2) # times calling this function
2085 * 3) elapsed time in this mode (not used, for now)
2087 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2089 struct iwl_scale_tbl_info *tbl;
2092 int flush_interval_passed = 0;
2093 struct iwl_priv *priv;
2096 active_tbl = lq_sta->active_tbl;
2098 tbl = &(lq_sta->lq_info[active_tbl]);
2100 /* If we've been disallowing search, see if we should now allow it */
2101 if (lq_sta->stay_in_tbl) {
2103 /* Elapsed time using current modulation mode */
2104 if (lq_sta->flush_timer)
2105 flush_interval_passed =
2107 (unsigned long)(lq_sta->flush_timer +
2108 IWL_RATE_SCALE_FLUSH_INTVL));
2111 * Check if we should allow search for new modulation mode.
2112 * If many frames have failed or succeeded, or we've used
2113 * this same modulation for a long time, allow search, and
2114 * reset history stats that keep track of whether we should
2115 * allow a new search. Also (below) reset all bitmaps and
2116 * stats in active history.
2119 (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2120 (lq_sta->total_success > lq_sta->max_success_limit) ||
2121 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2122 && (flush_interval_passed))) {
2123 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2124 lq_sta->total_failed,
2125 lq_sta->total_success,
2126 flush_interval_passed);
2128 /* Allow search for new mode */
2129 lq_sta->stay_in_tbl = 0; /* only place reset */
2130 lq_sta->total_failed = 0;
2131 lq_sta->total_success = 0;
2132 lq_sta->flush_timer = 0;
2135 * Else if we've used this modulation mode enough repetitions
2136 * (regardless of elapsed time or success/failure), reset
2137 * history bitmaps and rate-specific stats for all rates in
2141 lq_sta->table_count++;
2142 if (lq_sta->table_count >=
2143 lq_sta->table_count_limit) {
2144 lq_sta->table_count = 0;
2146 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2147 for (i = 0; i < IWL_RATE_COUNT; i++)
2148 rs_rate_scale_clear_window(
2153 /* If transitioning to allow "search", reset all history
2154 * bitmaps and stats in active table (this will become the new
2155 * "search" table). */
2156 if (!lq_sta->stay_in_tbl) {
2157 for (i = 0; i < IWL_RATE_COUNT; i++)
2158 rs_rate_scale_clear_window(&(tbl->win[i]));
2164 * setup rate table in uCode
2165 * return rate_n_flags as used in the table
2167 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
2168 struct iwl_rxon_context *ctx,
2169 struct iwl_lq_sta *lq_sta,
2170 struct iwl_scale_tbl_info *tbl,
2171 int index, u8 is_green)
2175 /* Update uCode's rate table. */
2176 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2177 rs_fill_link_cmd(priv, lq_sta, rate);
2178 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2184 * Do rate scaling and search for new modulation mode.
2186 static void rs_rate_scale_perform(struct iwl_priv *priv,
2187 struct sk_buff *skb,
2188 struct ieee80211_sta *sta,
2189 struct iwl_lq_sta *lq_sta)
2191 struct ieee80211_hw *hw = priv->hw;
2192 struct ieee80211_conf *conf = &hw->conf;
2193 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2194 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2195 int low = IWL_RATE_INVALID;
2196 int high = IWL_RATE_INVALID;
2199 struct iwl_rate_scale_data *window = NULL;
2200 int current_tpt = IWL_INVALID_VALUE;
2201 int low_tpt = IWL_INVALID_VALUE;
2202 int high_tpt = IWL_INVALID_VALUE;
2204 s8 scale_action = 0;
2207 struct iwl_scale_tbl_info *tbl, *tbl1;
2208 u16 rate_scale_index_msk = 0;
2215 u8 tid = MAX_TID_COUNT;
2216 struct iwl_tid_data *tid_data;
2217 struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2218 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2220 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2222 /* Send management frames and NO_ACK data using lowest rate. */
2223 /* TODO: this could probably be improved.. */
2224 if (!ieee80211_is_data(hdr->frame_control) ||
2225 info->flags & IEEE80211_TX_CTL_NO_ACK)
2228 if (!sta || !lq_sta)
2231 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2233 tid = rs_tl_add_packet(lq_sta, hdr);
2234 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2235 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2236 if (tid_data->agg.state == IWL_AGG_OFF)
2244 * Select rate-scale / modulation-mode table to work with in
2245 * the rest of this function: "search" if searching for better
2246 * modulation mode, or "active" if doing rate scaling within a mode.
2248 if (!lq_sta->search_better_tbl)
2249 active_tbl = lq_sta->active_tbl;
2251 active_tbl = 1 - lq_sta->active_tbl;
2253 tbl = &(lq_sta->lq_info[active_tbl]);
2254 if (is_legacy(tbl->lq_type))
2255 lq_sta->is_green = 0;
2257 lq_sta->is_green = rs_use_green(sta);
2258 is_green = lq_sta->is_green;
2260 /* current tx rate */
2261 index = lq_sta->last_txrate_idx;
2263 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2266 /* rates available for this association, and for modulation mode */
2267 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2269 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2271 /* mask with station rate restriction */
2272 if (is_legacy(tbl->lq_type)) {
2273 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2274 /* supp_rates has no CCK bits in A mode */
2275 rate_scale_index_msk = (u16) (rate_mask &
2276 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2278 rate_scale_index_msk = (u16) (rate_mask &
2279 lq_sta->supp_rates);
2282 rate_scale_index_msk = rate_mask;
2284 if (!rate_scale_index_msk)
2285 rate_scale_index_msk = rate_mask;
2287 if (!((1 << index) & rate_scale_index_msk)) {
2288 IWL_ERR(priv, "Current Rate is not valid\n");
2289 if (lq_sta->search_better_tbl) {
2290 /* revert to active table if search table is not valid*/
2291 tbl->lq_type = LQ_NONE;
2292 lq_sta->search_better_tbl = 0;
2293 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2294 /* get "active" rate info */
2295 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2296 rate = rs_update_rate_tbl(priv, ctx, lq_sta,
2297 tbl, index, is_green);
2302 /* Get expected throughput table and history window for current rate */
2303 if (!tbl->expected_tpt) {
2304 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2308 /* force user max rate if set by user */
2309 if ((lq_sta->max_rate_idx != -1) &&
2310 (lq_sta->max_rate_idx < index)) {
2311 index = lq_sta->max_rate_idx;
2313 window = &(tbl->win[index]);
2317 window = &(tbl->win[index]);
2320 * If there is not enough history to calculate actual average
2321 * throughput, keep analyzing results of more tx frames, without
2322 * changing rate or mode (bypass most of the rest of this function).
2323 * Set up new rate table in uCode only if old rate is not supported
2324 * in current association (use new rate found above).
2326 fail_count = window->counter - window->success_counter;
2327 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2328 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2329 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2331 window->success_counter, window->counter, index);
2333 /* Can't calculate this yet; not enough history */
2334 window->average_tpt = IWL_INVALID_VALUE;
2336 /* Should we stay with this modulation mode,
2337 * or search for a new one? */
2338 rs_stay_in_table(lq_sta, false);
2342 /* Else we have enough samples; calculate estimate of
2343 * actual average throughput */
2344 if (window->average_tpt != ((window->success_ratio *
2345 tbl->expected_tpt[index] + 64) / 128)) {
2346 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2347 window->average_tpt = ((window->success_ratio *
2348 tbl->expected_tpt[index] + 64) / 128);
2351 /* If we are searching for better modulation mode, check success. */
2352 if (lq_sta->search_better_tbl &&
2353 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2354 /* If good success, continue using the "search" mode;
2355 * no need to send new link quality command, since we're
2356 * continuing to use the setup that we've been trying. */
2357 if (window->average_tpt > lq_sta->last_tpt) {
2359 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2360 "suc=%d cur-tpt=%d old-tpt=%d\n",
2361 window->success_ratio,
2362 window->average_tpt,
2365 if (!is_legacy(tbl->lq_type))
2366 lq_sta->enable_counter = 1;
2368 /* Swap tables; "search" becomes "active" */
2369 lq_sta->active_tbl = active_tbl;
2370 current_tpt = window->average_tpt;
2372 /* Else poor success; go back to mode in "active" table */
2375 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2376 "suc=%d cur-tpt=%d old-tpt=%d\n",
2377 window->success_ratio,
2378 window->average_tpt,
2381 /* Nullify "search" table */
2382 tbl->lq_type = LQ_NONE;
2384 /* Revert to "active" table */
2385 active_tbl = lq_sta->active_tbl;
2386 tbl = &(lq_sta->lq_info[active_tbl]);
2388 /* Revert to "active" rate and throughput info */
2389 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2390 current_tpt = lq_sta->last_tpt;
2392 /* Need to set up a new rate table in uCode */
2396 /* Either way, we've made a decision; modulation mode
2397 * search is done, allow rate adjustment next time. */
2398 lq_sta->search_better_tbl = 0;
2399 done_search = 1; /* Don't switch modes below! */
2403 /* (Else) not in search of better modulation mode, try for better
2404 * starting rate, while staying in this mode. */
2405 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2407 low = high_low & 0xff;
2408 high = (high_low >> 8) & 0xff;
2410 /* If user set max rate, dont allow higher than user constrain */
2411 if ((lq_sta->max_rate_idx != -1) &&
2412 (lq_sta->max_rate_idx < high))
2413 high = IWL_RATE_INVALID;
2415 sr = window->success_ratio;
2417 /* Collect measured throughputs for current and adjacent rates */
2418 current_tpt = window->average_tpt;
2419 if (low != IWL_RATE_INVALID)
2420 low_tpt = tbl->win[low].average_tpt;
2421 if (high != IWL_RATE_INVALID)
2422 high_tpt = tbl->win[high].average_tpt;
2426 /* Too many failures, decrease rate */
2427 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2428 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2431 /* No throughput measured yet for adjacent rates; try increase. */
2432 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2433 (high_tpt == IWL_INVALID_VALUE)) {
2435 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2437 else if (low != IWL_RATE_INVALID)
2441 /* Both adjacent throughputs are measured, but neither one has better
2442 * throughput; we're using the best rate, don't change it! */
2443 else if ((low_tpt != IWL_INVALID_VALUE) &&
2444 (high_tpt != IWL_INVALID_VALUE) &&
2445 (low_tpt < current_tpt) &&
2446 (high_tpt < current_tpt))
2449 /* At least one adjacent rate's throughput is measured,
2450 * and may have better performance. */
2452 /* Higher adjacent rate's throughput is measured */
2453 if (high_tpt != IWL_INVALID_VALUE) {
2454 /* Higher rate has better throughput */
2455 if (high_tpt > current_tpt &&
2456 sr >= IWL_RATE_INCREASE_TH) {
2462 /* Lower adjacent rate's throughput is measured */
2463 } else if (low_tpt != IWL_INVALID_VALUE) {
2464 /* Lower rate has better throughput */
2465 if (low_tpt > current_tpt) {
2466 IWL_DEBUG_RATE(priv,
2467 "decrease rate because of low tpt\n");
2469 } else if (sr >= IWL_RATE_INCREASE_TH) {
2475 /* Sanity check; asked for decrease, but success rate or throughput
2476 * has been good at old rate. Don't change it. */
2477 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2478 ((sr > IWL_RATE_HIGH_TH) ||
2479 (current_tpt > (100 * tbl->expected_tpt[low]))))
2481 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2483 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2484 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2487 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2488 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2489 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2491 * don't set scale_action, don't want to scale up if
2492 * the rate scale doesn't otherwise think that is a
2495 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2499 lq_sta->last_bt_traffic = priv->bt_traffic_load;
2501 if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2502 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2503 /* search for a new modulation */
2504 rs_stay_in_table(lq_sta, true);
2508 switch (scale_action) {
2510 /* Decrease starting rate, update uCode's rate table */
2511 if (low != IWL_RATE_INVALID) {
2518 /* Increase starting rate, update uCode's rate table */
2519 if (high != IWL_RATE_INVALID) {
2531 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2532 "high %d type %d\n",
2533 index, scale_action, low, high, tbl->lq_type);
2536 /* Replace uCode's rate table for the destination station. */
2538 rate = rs_update_rate_tbl(priv, ctx, lq_sta,
2539 tbl, index, is_green);
2541 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2542 /* Should we stay with this modulation mode,
2543 * or search for a new one? */
2544 rs_stay_in_table(lq_sta, false);
2547 * Search for new modulation mode if we're:
2548 * 1) Not changing rates right now
2549 * 2) Not just finishing up a search
2550 * 3) Allowing a new search
2552 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2553 /* Save current throughput to compare with "search" throughput*/
2554 lq_sta->last_tpt = current_tpt;
2556 /* Select a new "search" modulation mode to try.
2557 * If one is found, set up the new "search" table. */
2558 if (is_legacy(tbl->lq_type))
2559 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2560 else if (is_siso(tbl->lq_type))
2561 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2562 else if (is_mimo2(tbl->lq_type))
2563 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2565 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2567 /* If new "search" mode was selected, set up in uCode table */
2568 if (lq_sta->search_better_tbl) {
2569 /* Access the "search" table, clear its history. */
2570 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2571 for (i = 0; i < IWL_RATE_COUNT; i++)
2572 rs_rate_scale_clear_window(&(tbl->win[i]));
2574 /* Use new "search" start rate */
2575 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2577 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2578 tbl->current_rate, index);
2579 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2580 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2585 if (done_search && !lq_sta->stay_in_tbl) {
2586 /* If the "active" (non-search) mode was legacy,
2587 * and we've tried switching antennas,
2588 * but we haven't been able to try HT modes (not available),
2589 * stay with best antenna legacy modulation for a while
2590 * before next round of mode comparisons. */
2591 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2592 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2593 lq_sta->action_counter > tbl1->max_search) {
2594 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2595 rs_set_stay_in_table(priv, 1, lq_sta);
2598 /* If we're in an HT mode, and all 3 mode switch actions
2599 * have been tried and compared, stay in this best modulation
2600 * mode for a while before next round of mode comparisons. */
2601 if (lq_sta->enable_counter &&
2602 (lq_sta->action_counter >= tbl1->max_search) &&
2603 iwl_ht_enabled(priv)) {
2604 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2605 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2606 (tid != MAX_TID_COUNT)) {
2608 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2609 if (tid_data->agg.state == IWL_AGG_OFF) {
2610 IWL_DEBUG_RATE(priv,
2611 "try to aggregate tid %d\n",
2613 rs_tl_turn_on_agg(priv, tid,
2617 rs_set_stay_in_table(priv, 0, lq_sta);
2622 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2624 lq_sta->last_txrate_idx = i;
2628 * rs_initialize_lq - Initialize a station's hardware rate table
2630 * The uCode's station table contains a table of fallback rates
2631 * for automatic fallback during transmission.
2633 * NOTE: This sets up a default set of values. These will be replaced later
2634 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2637 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2638 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2639 * which requires station table entry to exist).
2641 static void rs_initialize_lq(struct iwl_priv *priv,
2642 struct ieee80211_conf *conf,
2643 struct ieee80211_sta *sta,
2644 struct iwl_lq_sta *lq_sta)
2646 struct iwl_scale_tbl_info *tbl;
2650 u8 use_green = rs_use_green(sta);
2653 struct iwl_station_priv *sta_priv;
2654 struct iwl_rxon_context *ctx;
2656 if (!sta || !lq_sta)
2659 sta_priv = (void *)sta->drv_priv;
2660 ctx = sta_priv->common.ctx;
2662 i = lq_sta->last_txrate_idx;
2664 valid_tx_ant = priv->hw_params.valid_tx_ant;
2666 if (!lq_sta->search_better_tbl)
2667 active_tbl = lq_sta->active_tbl;
2669 active_tbl = 1 - lq_sta->active_tbl;
2671 tbl = &(lq_sta->lq_info[active_tbl]);
2673 if ((i < 0) || (i >= IWL_RATE_COUNT))
2676 rate = iwl_rates[i].plcp;
2677 tbl->ant_type = first_antenna(valid_tx_ant);
2678 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2680 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2681 rate |= RATE_MCS_CCK_MSK;
2683 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2684 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2685 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2687 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2688 tbl->current_rate = rate;
2689 rs_set_expected_tpt_table(lq_sta, tbl);
2690 rs_fill_link_cmd(NULL, lq_sta, rate);
2691 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2692 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2695 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2696 struct ieee80211_tx_rate_control *txrc)
2699 struct sk_buff *skb = txrc->skb;
2700 struct ieee80211_supported_band *sband = txrc->sband;
2701 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2702 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2703 struct iwl_lq_sta *lq_sta = priv_sta;
2706 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2708 /* Get max rate if user set max rate */
2710 lq_sta->max_rate_idx = txrc->max_rate_idx;
2711 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2712 (lq_sta->max_rate_idx != -1))
2713 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2714 if ((lq_sta->max_rate_idx < 0) ||
2715 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2716 lq_sta->max_rate_idx = -1;
2719 /* Treat uninitialized rate scaling data same as non-existing. */
2720 if (lq_sta && !lq_sta->drv) {
2721 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2725 /* Send management frames and NO_ACK data using lowest rate. */
2726 if (rate_control_send_low(sta, priv_sta, txrc))
2729 rate_idx = lq_sta->last_txrate_idx;
2731 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2732 rate_idx -= IWL_FIRST_OFDM_RATE;
2733 /* 6M and 9M shared same MCS index */
2734 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2735 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2736 IWL_RATE_MIMO3_6M_PLCP)
2737 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2738 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2739 IWL_RATE_MIMO2_6M_PLCP)
2740 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2741 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2742 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2743 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2744 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2745 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2746 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2747 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2748 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2749 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2751 /* Check for invalid rates */
2752 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2753 ((sband->band == IEEE80211_BAND_5GHZ) &&
2754 (rate_idx < IWL_FIRST_OFDM_RATE)))
2755 rate_idx = rate_lowest_index(sband, sta);
2756 /* On valid 5 GHz rate, adjust index */
2757 else if (sband->band == IEEE80211_BAND_5GHZ)
2758 rate_idx -= IWL_FIRST_OFDM_RATE;
2759 info->control.rates[0].flags = 0;
2761 info->control.rates[0].idx = rate_idx;
2765 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2768 struct iwl_lq_sta *lq_sta;
2769 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2770 struct iwl_priv *priv;
2772 priv = (struct iwl_priv *)priv_rate;
2773 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2775 lq_sta = &sta_priv->lq_sta;
2781 * Called after adding a new station to initialize rate scaling
2783 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2786 struct ieee80211_hw *hw = priv->hw;
2787 struct ieee80211_conf *conf = &priv->hw->conf;
2788 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2789 struct iwl_station_priv *sta_priv;
2790 struct iwl_lq_sta *lq_sta;
2791 struct ieee80211_supported_band *sband;
2793 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2794 lq_sta = &sta_priv->lq_sta;
2795 sband = hw->wiphy->bands[conf->channel->band];
2798 lq_sta->lq.sta_id = sta_id;
2800 for (j = 0; j < LQ_SIZE; j++)
2801 for (i = 0; i < IWL_RATE_COUNT; i++)
2802 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2804 lq_sta->flush_timer = 0;
2805 lq_sta->supp_rates = sta->supp_rates[sband->band];
2806 for (j = 0; j < LQ_SIZE; j++)
2807 for (i = 0; i < IWL_RATE_COUNT; i++)
2808 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2810 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2812 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2813 * the lowest or the highest rate.. Could consider using RSSI from
2814 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2818 lq_sta->max_rate_idx = -1;
2819 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2820 lq_sta->is_green = rs_use_green(sta);
2821 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2822 lq_sta->band = priv->band;
2824 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2825 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2827 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2828 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2829 lq_sta->active_siso_rate &= ~((u16)0x2);
2830 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2833 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2834 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2835 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2836 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2838 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2839 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2840 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2841 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2843 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2844 lq_sta->active_siso_rate,
2845 lq_sta->active_mimo2_rate,
2846 lq_sta->active_mimo3_rate);
2848 /* These values will be overridden later */
2849 lq_sta->lq.general_params.single_stream_ant_msk =
2850 first_antenna(priv->hw_params.valid_tx_ant);
2851 lq_sta->lq.general_params.dual_stream_ant_msk =
2852 priv->hw_params.valid_tx_ant &
2853 ~first_antenna(priv->hw_params.valid_tx_ant);
2854 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2855 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2856 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2857 lq_sta->lq.general_params.dual_stream_ant_msk =
2858 priv->hw_params.valid_tx_ant;
2861 /* as default allow aggregation for all tids */
2862 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2865 /* Set last_txrate_idx to lowest rate */
2866 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2867 if (sband->band == IEEE80211_BAND_5GHZ)
2868 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2871 rs_initialize_lq(priv, conf, sta, lq_sta);
2874 static void rs_fill_link_cmd(struct iwl_priv *priv,
2875 struct iwl_lq_sta *lq_sta, u32 new_rate)
2877 struct iwl_scale_tbl_info tbl_type;
2880 int repeat_rate = 0;
2881 u8 ant_toggle_cnt = 0;
2882 u8 use_ht_possible = 1;
2883 u8 valid_tx_ant = 0;
2884 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2886 /* Override starting rate (index 0) if needed for debug purposes */
2887 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2889 /* Interpret new_rate (rate_n_flags) */
2890 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2891 &tbl_type, &rate_idx);
2893 if (priv && priv->bt_full_concurrent) {
2896 first_antenna(priv->hw_params.valid_tx_ant);
2899 /* How many times should we repeat the initial rate? */
2900 if (is_legacy(tbl_type.lq_type)) {
2902 repeat_rate = IWL_NUMBER_TRY;
2904 repeat_rate = IWL_HT_NUMBER_TRY;
2907 lq_cmd->general_params.mimo_delimiter =
2908 is_mimo(tbl_type.lq_type) ? 1 : 0;
2910 /* Fill 1st table entry (index 0) */
2911 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2913 if (num_of_ant(tbl_type.ant_type) == 1) {
2914 lq_cmd->general_params.single_stream_ant_msk =
2916 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2917 lq_cmd->general_params.dual_stream_ant_msk =
2919 } /* otherwise we don't modify the existing value */
2924 if (priv->bt_full_concurrent)
2925 valid_tx_ant = ANT_A;
2927 valid_tx_ant = priv->hw_params.valid_tx_ant;
2930 /* Fill rest of rate table */
2931 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2932 /* Repeat initial/next rate.
2933 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2934 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2935 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2936 if (is_legacy(tbl_type.lq_type)) {
2937 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2940 rs_toggle_antenna(valid_tx_ant,
2941 &new_rate, &tbl_type))
2945 /* Override next rate if needed for debug purposes */
2946 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2948 /* Fill next table entry */
2949 lq_cmd->rs_table[index].rate_n_flags =
2950 cpu_to_le32(new_rate);
2955 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2958 if (priv && priv->bt_full_concurrent) {
2961 first_antenna(priv->hw_params.valid_tx_ant);
2964 /* Indicate to uCode which entries might be MIMO.
2965 * If initial rate was MIMO, this will finally end up
2966 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2967 if (is_mimo(tbl_type.lq_type))
2968 lq_cmd->general_params.mimo_delimiter = index;
2971 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2974 /* How many times should we repeat the next rate? */
2975 if (is_legacy(tbl_type.lq_type)) {
2976 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2979 rs_toggle_antenna(valid_tx_ant,
2980 &new_rate, &tbl_type))
2983 repeat_rate = IWL_NUMBER_TRY;
2985 repeat_rate = IWL_HT_NUMBER_TRY;
2988 /* Don't allow HT rates after next pass.
2989 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2990 use_ht_possible = 0;
2992 /* Override next rate if needed for debug purposes */
2993 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2995 /* Fill next table entry */
2996 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3002 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3003 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3005 lq_cmd->agg_params.agg_time_limit =
3006 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3008 * overwrite if needed, pass aggregation time limit
3011 if (priv && priv->cfg->bt_params &&
3012 priv->cfg->bt_params->agg_time_limit &&
3013 priv->cfg->bt_params->agg_time_limit >=
3014 LINK_QUAL_AGG_TIME_LIMIT_MIN &&
3015 priv->cfg->bt_params->agg_time_limit <=
3016 LINK_QUAL_AGG_TIME_LIMIT_MAX)
3017 lq_cmd->agg_params.agg_time_limit =
3018 cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3021 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3025 /* rate scale requires free function to be implemented */
3026 static void rs_free(void *priv_rate)
3031 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3034 struct iwl_priv *priv __maybe_unused = priv_r;
3036 IWL_DEBUG_RATE(priv, "enter\n");
3037 IWL_DEBUG_RATE(priv, "leave\n");
3041 #ifdef CONFIG_MAC80211_DEBUGFS
3042 static int open_file_generic(struct inode *inode, struct file *file)
3044 file->private_data = inode->i_private;
3047 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3048 u32 *rate_n_flags, int index)
3050 struct iwl_priv *priv;
3055 valid_tx_ant = priv->hw_params.valid_tx_ant;
3056 if (lq_sta->dbg_fixed_rate) {
3058 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3059 >> RATE_MCS_ANT_POS);
3060 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3061 *rate_n_flags = lq_sta->dbg_fixed_rate;
3062 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3064 lq_sta->dbg_fixed_rate = 0;
3066 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3067 ant_sel_tx, valid_tx_ant);
3068 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3071 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3075 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3076 const char __user *user_buf, size_t count, loff_t *ppos)
3078 struct iwl_lq_sta *lq_sta = file->private_data;
3079 struct iwl_priv *priv;
3083 struct iwl_station_priv *sta_priv =
3084 container_of(lq_sta, struct iwl_station_priv, lq_sta);
3085 struct iwl_rxon_context *ctx = sta_priv->common.ctx;
3088 memset(buf, 0, sizeof(buf));
3089 buf_size = min(count, sizeof(buf) - 1);
3090 if (copy_from_user(buf, user_buf, buf_size))
3093 if (sscanf(buf, "%x", &parsed_rate) == 1)
3094 lq_sta->dbg_fixed_rate = parsed_rate;
3096 lq_sta->dbg_fixed_rate = 0;
3098 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
3099 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3100 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3101 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
3103 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
3104 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
3106 if (lq_sta->dbg_fixed_rate) {
3107 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
3108 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
3115 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3116 char __user *user_buf, size_t count, loff_t *ppos)
3124 struct iwl_lq_sta *lq_sta = file->private_data;
3125 struct iwl_priv *priv;
3126 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3129 buff = kmalloc(1024, GFP_KERNEL);
3133 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3134 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3135 lq_sta->total_failed, lq_sta->total_success,
3136 lq_sta->active_legacy_rate);
3137 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3138 lq_sta->dbg_fixed_rate);
3139 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3140 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3141 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3142 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3143 desc += sprintf(buff+desc, "lq type %s\n",
3144 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3145 if (is_Ht(tbl->lq_type)) {
3146 desc += sprintf(buff+desc, " %s",
3147 (is_siso(tbl->lq_type)) ? "SISO" :
3148 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3149 desc += sprintf(buff+desc, " %s",
3150 (tbl->is_ht40) ? "40MHz" : "20MHz");
3151 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3152 (lq_sta->is_green) ? "GF enabled" : "",
3153 (lq_sta->is_agg) ? "AGG on" : "");
3155 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3156 lq_sta->last_rate_n_flags);
3157 desc += sprintf(buff+desc, "general:"
3158 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3159 lq_sta->lq.general_params.flags,
3160 lq_sta->lq.general_params.mimo_delimiter,
3161 lq_sta->lq.general_params.single_stream_ant_msk,
3162 lq_sta->lq.general_params.dual_stream_ant_msk);
3164 desc += sprintf(buff+desc, "agg:"
3165 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3166 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3167 lq_sta->lq.agg_params.agg_dis_start_th,
3168 lq_sta->lq.agg_params.agg_frame_cnt_limit);
3170 desc += sprintf(buff+desc,
3171 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3172 lq_sta->lq.general_params.start_rate_index[0],
3173 lq_sta->lq.general_params.start_rate_index[1],
3174 lq_sta->lq.general_params.start_rate_index[2],
3175 lq_sta->lq.general_params.start_rate_index[3]);
3177 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3178 index = iwl_hwrate_to_plcp_idx(
3179 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3180 if (is_legacy(tbl->lq_type)) {
3181 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3182 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3183 iwl_rate_mcs[index].mbps);
3185 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3186 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3187 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3191 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3196 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3197 .write = rs_sta_dbgfs_scale_table_write,
3198 .read = rs_sta_dbgfs_scale_table_read,
3199 .open = open_file_generic,
3200 .llseek = default_llseek,
3202 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3203 char __user *user_buf, size_t count, loff_t *ppos)
3210 struct iwl_lq_sta *lq_sta = file->private_data;
3212 buff = kmalloc(1024, GFP_KERNEL);
3216 for (i = 0; i < LQ_SIZE; i++) {
3217 desc += sprintf(buff+desc,
3218 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3220 lq_sta->active_tbl == i ? "*" : "x",
3221 lq_sta->lq_info[i].lq_type,
3222 lq_sta->lq_info[i].is_SGI,
3223 lq_sta->lq_info[i].is_ht40,
3224 lq_sta->lq_info[i].is_dup,
3226 lq_sta->lq_info[i].current_rate);
3227 for (j = 0; j < IWL_RATE_COUNT; j++) {
3228 desc += sprintf(buff+desc,
3229 "counter=%d success=%d %%=%d\n",
3230 lq_sta->lq_info[i].win[j].counter,
3231 lq_sta->lq_info[i].win[j].success_counter,
3232 lq_sta->lq_info[i].win[j].success_ratio);
3235 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3240 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3241 .read = rs_sta_dbgfs_stats_table_read,
3242 .open = open_file_generic,
3243 .llseek = default_llseek,
3246 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3247 char __user *user_buf, size_t count, loff_t *ppos)
3253 struct iwl_lq_sta *lq_sta = file->private_data;
3254 struct iwl_priv *priv;
3255 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3259 if (is_Ht(tbl->lq_type))
3260 desc += sprintf(buff+desc,
3261 "Bit Rate= %d Mb/s\n",
3262 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3264 desc += sprintf(buff+desc,
3265 "Bit Rate= %d Mb/s\n",
3266 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3268 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3272 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3273 .read = rs_sta_dbgfs_rate_scale_data_read,
3274 .open = open_file_generic,
3275 .llseek = default_llseek,
3278 static void rs_add_debugfs(void *priv, void *priv_sta,
3281 struct iwl_lq_sta *lq_sta = priv_sta;
3282 lq_sta->rs_sta_dbgfs_scale_table_file =
3283 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3284 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3285 lq_sta->rs_sta_dbgfs_stats_table_file =
3286 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3287 lq_sta, &rs_sta_dbgfs_stats_table_ops);
3288 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3289 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3290 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3291 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3292 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3293 &lq_sta->tx_agg_tid_en);
3297 static void rs_remove_debugfs(void *priv, void *priv_sta)
3299 struct iwl_lq_sta *lq_sta = priv_sta;
3300 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3301 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3302 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3303 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3308 * Initialization of rate scaling information is done by driver after
3309 * the station is added. Since mac80211 calls this function before a
3310 * station is added we ignore it.
3312 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3313 struct ieee80211_sta *sta, void *priv_sta)
3316 static struct rate_control_ops rs_ops = {
3319 .tx_status = rs_tx_status,
3320 .get_rate = rs_get_rate,
3321 .rate_init = rs_rate_init_stub,
3324 .alloc_sta = rs_alloc_sta,
3325 .free_sta = rs_free_sta,
3326 #ifdef CONFIG_MAC80211_DEBUGFS
3327 .add_sta_debugfs = rs_add_debugfs,
3328 .remove_sta_debugfs = rs_remove_debugfs,
3332 int iwlagn_rate_control_register(void)
3334 return ieee80211_rate_control_register(&rs_ops);
3337 void iwlagn_rate_control_unregister(void)
3339 ieee80211_rate_control_unregister(&rs_ops);