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/wireless.h>
30 #include <net/mac80211.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
36 #include <linux/workqueue.h>
42 #define RS_NAME "iwl-agn-rs"
44 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
45 #define IWL_NUMBER_TRY 1
46 #define IWL_HT_NUMBER_TRY 3
48 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
49 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
50 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
52 /* max allowed rate miss before sync LQ cmd */
53 #define IWL_MISSED_RATE_MAX 15
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
57 static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
67 static const u8 ant_toggle_lookup[] = {
68 /*ANT_NONE -> */ ANT_NONE,
71 /*ANT_AB -> */ ANT_BC,
73 /*ANT_AC -> */ ANT_AB,
74 /*ANT_BC -> */ ANT_AC,
75 /*ANT_ABC -> */ ANT_ABC,
78 static void rs_rate_scale_perform(struct iwl_priv *priv,
80 struct ieee80211_sta *sta,
81 struct iwl_lq_sta *lq_sta);
82 static void rs_fill_link_cmd(struct iwl_priv *priv,
83 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
86 #ifdef CONFIG_MAC80211_DEBUGFS
87 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
88 u32 *rate_n_flags, int index);
90 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
91 u32 *rate_n_flags, int index)
96 * The following tables contain the expected throughput metrics for all rates
98 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
100 * where invalid entries are zeros.
102 * CCK rates are only valid in legacy table and will only be used in G
106 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
107 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
110 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
111 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
112 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
113 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
114 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
117 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
118 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
119 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
120 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
121 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
124 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
125 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
126 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
127 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
128 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
131 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
132 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
133 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
134 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
135 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
138 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
139 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
140 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
141 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
142 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
145 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
146 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
147 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
148 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
149 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
153 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
162 { "24", "16QAM 1/2"},
163 { "36", "16QAM 3/4"},
164 { "48", "64QAM 2/3"},
165 { "54", "64QAM 3/4"},
166 { "60", "64QAM 5/6"},
169 #define MCS_INDEX_PER_STREAM (8)
171 static inline u8 rs_extract_rate(u32 rate_n_flags)
173 return (u8)(rate_n_flags & 0xFF);
176 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
179 window->success_counter = 0;
180 window->success_ratio = IWL_INVALID_VALUE;
182 window->average_tpt = IWL_INVALID_VALUE;
186 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
188 return (ant_type & valid_antenna) == ant_type;
192 * removes the old data from the statistics. All data that is older than
193 * TID_MAX_TIME_DIFF, will be deleted.
195 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
197 /* The oldest age we want to keep */
198 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
200 while (tl->queue_count &&
201 (tl->time_stamp < oldest_time)) {
202 tl->total -= tl->packet_count[tl->head];
203 tl->packet_count[tl->head] = 0;
204 tl->time_stamp += TID_QUEUE_CELL_SPACING;
207 if (tl->head >= TID_QUEUE_MAX_SIZE)
213 * increment traffic load value for tid and also remove
214 * any old values if passed the certain time period
216 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
217 struct ieee80211_hdr *hdr)
219 u32 curr_time = jiffies_to_msecs(jiffies);
222 struct iwl_traffic_load *tl = NULL;
225 if (ieee80211_is_data_qos(hdr->frame_control)) {
226 u8 *qc = ieee80211_get_qos_ctl(hdr);
229 return MAX_TID_COUNT;
231 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
232 return MAX_TID_COUNT;
234 tl = &lq_data->load[tid];
236 curr_time -= curr_time % TID_ROUND_VALUE;
238 /* Happens only for the first packet. Initialize the data */
239 if (!(tl->queue_count)) {
241 tl->time_stamp = curr_time;
244 tl->packet_count[0] = 1;
245 return MAX_TID_COUNT;
248 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
249 index = time_diff / TID_QUEUE_CELL_SPACING;
251 /* The history is too long: remove data that is older than */
252 /* TID_MAX_TIME_DIFF */
253 if (index >= TID_QUEUE_MAX_SIZE)
254 rs_tl_rm_old_stats(tl, curr_time);
256 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
257 tl->packet_count[index] = tl->packet_count[index] + 1;
258 tl->total = tl->total + 1;
260 if ((index + 1) > tl->queue_count)
261 tl->queue_count = index + 1;
267 get the traffic load value for tid
269 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
271 u32 curr_time = jiffies_to_msecs(jiffies);
274 struct iwl_traffic_load *tl = NULL;
276 if (tid >= TID_MAX_LOAD_COUNT)
279 tl = &(lq_data->load[tid]);
281 curr_time -= curr_time % TID_ROUND_VALUE;
283 if (!(tl->queue_count))
286 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
287 index = time_diff / TID_QUEUE_CELL_SPACING;
289 /* The history is too long: remove data that is older than */
290 /* TID_MAX_TIME_DIFF */
291 if (index >= TID_QUEUE_MAX_SIZE)
292 rs_tl_rm_old_stats(tl, curr_time);
297 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
298 struct iwl_lq_sta *lq_data, u8 tid,
299 struct ieee80211_sta *sta)
303 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
304 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
306 ret = ieee80211_start_tx_ba_session(sta, tid);
307 if (ret == -EAGAIN) {
309 * driver and mac80211 is out of sync
310 * this might be cause by reloading firmware
311 * stop the tx ba session here
313 IWL_DEBUG_HT(priv, "Fail start Tx agg on tid: %d\n",
315 ieee80211_stop_tx_ba_session(sta, tid,
316 WLAN_BACK_INITIATOR);
319 IWL_ERR(priv, "Fail finding valid aggregation tid: %d\n", tid);
323 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
324 struct iwl_lq_sta *lq_data,
325 struct ieee80211_sta *sta)
327 if ((tid < TID_MAX_LOAD_COUNT) &&
328 !rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta)) {
329 if (priv->cfg->use_rts_for_ht) {
331 * switch to RTS/CTS if it is the prefer protection
332 * method for HT traffic
334 IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
335 priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
336 iwlcore_commit_rxon(priv);
341 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
343 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
344 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
345 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
349 * Static function to get the expected throughput from an iwl_scale_tbl_info
350 * that wraps a NULL pointer check
352 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
354 if (tbl->expected_tpt)
355 return tbl->expected_tpt[rs_index];
360 * rs_collect_tx_data - Update the success/failure sliding window
362 * We keep a sliding window of the last 62 packets transmitted
363 * at this rate. window->data contains the bitmask of successful
366 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
367 int scale_index, int attempts, int successes)
369 struct iwl_rate_scale_data *window = NULL;
370 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
373 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
376 /* Select window for current tx bit rate */
377 window = &(tbl->win[scale_index]);
379 /* Get expected throughput */
380 tpt = get_expected_tpt(tbl, scale_index);
383 * Keep track of only the latest 62 tx frame attempts in this rate's
384 * history window; anything older isn't really relevant any more.
385 * If we have filled up the sliding window, drop the oldest attempt;
386 * if the oldest attempt (highest bit in bitmap) shows "success",
387 * subtract "1" from the success counter (this is the main reason
388 * we keep these bitmaps!).
390 while (attempts > 0) {
391 if (window->counter >= IWL_RATE_MAX_WINDOW) {
393 /* remove earliest */
394 window->counter = IWL_RATE_MAX_WINDOW - 1;
396 if (window->data & mask) {
397 window->data &= ~mask;
398 window->success_counter--;
402 /* Increment frames-attempted counter */
405 /* Shift bitmap by one frame to throw away oldest history */
408 /* Mark the most recent #successes attempts as successful */
410 window->success_counter++;
418 /* Calculate current success ratio, avoid divide-by-0! */
419 if (window->counter > 0)
420 window->success_ratio = 128 * (100 * window->success_counter)
423 window->success_ratio = IWL_INVALID_VALUE;
425 fail_count = window->counter - window->success_counter;
427 /* Calculate average throughput, if we have enough history. */
428 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
429 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
430 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
432 window->average_tpt = IWL_INVALID_VALUE;
434 /* Tag this window as having been updated */
435 window->stamp = jiffies;
441 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
443 /* FIXME:RS:remove this function and put the flags statically in the table */
444 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
445 struct iwl_scale_tbl_info *tbl,
446 int index, u8 use_green)
448 u32 rate_n_flags = 0;
450 if (is_legacy(tbl->lq_type)) {
451 rate_n_flags = iwl_rates[index].plcp;
452 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
453 rate_n_flags |= RATE_MCS_CCK_MSK;
455 } else if (is_Ht(tbl->lq_type)) {
456 if (index > IWL_LAST_OFDM_RATE) {
457 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
458 index = IWL_LAST_OFDM_RATE;
460 rate_n_flags = RATE_MCS_HT_MSK;
462 if (is_siso(tbl->lq_type))
463 rate_n_flags |= iwl_rates[index].plcp_siso;
464 else if (is_mimo2(tbl->lq_type))
465 rate_n_flags |= iwl_rates[index].plcp_mimo2;
467 rate_n_flags |= iwl_rates[index].plcp_mimo3;
469 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
472 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
473 RATE_MCS_ANT_ABC_MSK);
475 if (is_Ht(tbl->lq_type)) {
478 rate_n_flags |= RATE_MCS_DUP_MSK;
480 rate_n_flags |= RATE_MCS_HT40_MSK;
483 rate_n_flags |= RATE_MCS_SGI_MSK;
486 rate_n_flags |= RATE_MCS_GF_MSK;
487 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
488 rate_n_flags &= ~RATE_MCS_SGI_MSK;
489 IWL_ERR(priv, "GF was set with SGI:SISO\n");
497 * Interpret uCode API's rate_n_flags format,
498 * fill "search" or "active" tx mode table.
500 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
501 enum ieee80211_band band,
502 struct iwl_scale_tbl_info *tbl,
505 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
506 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
509 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
511 if (*rate_idx == IWL_RATE_INVALID) {
515 tbl->is_SGI = 0; /* default legacy setup */
518 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
519 tbl->lq_type = LQ_NONE;
520 tbl->max_search = IWL_MAX_SEARCH;
522 /* legacy rate format */
523 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
524 if (num_of_ant == 1) {
525 if (band == IEEE80211_BAND_5GHZ)
532 if (rate_n_flags & RATE_MCS_SGI_MSK)
535 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
536 (rate_n_flags & RATE_MCS_DUP_MSK))
539 if (rate_n_flags & RATE_MCS_DUP_MSK)
542 mcs = rs_extract_rate(rate_n_flags);
545 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
547 tbl->lq_type = LQ_SISO; /*else NONE*/
549 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
551 tbl->lq_type = LQ_MIMO2;
554 if (num_of_ant == 3) {
555 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
556 tbl->lq_type = LQ_MIMO3;
563 /* switch to another antenna/antennas and return 1 */
564 /* if no other valid antenna found, return 0 */
565 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
566 struct iwl_scale_tbl_info *tbl)
570 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
573 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
576 new_ant_type = ant_toggle_lookup[tbl->ant_type];
578 while ((new_ant_type != tbl->ant_type) &&
579 !rs_is_valid_ant(valid_ant, new_ant_type))
580 new_ant_type = ant_toggle_lookup[new_ant_type];
582 if (new_ant_type == tbl->ant_type)
585 tbl->ant_type = new_ant_type;
586 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
587 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
592 * Green-field mode is valid if the station supports it and
593 * there are no non-GF stations present in the BSS.
595 static inline u8 rs_use_green(struct ieee80211_sta *sta,
596 struct iwl_ht_config *ht_conf)
598 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
599 !(ht_conf->non_GF_STA_present);
603 * rs_get_supported_rates - get the available rates
605 * if management frame or broadcast frame only return
606 * basic available rates.
609 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
610 struct ieee80211_hdr *hdr,
611 enum iwl_table_type rate_type)
613 if (is_legacy(rate_type)) {
614 return lq_sta->active_legacy_rate;
616 if (is_siso(rate_type))
617 return lq_sta->active_siso_rate;
618 else if (is_mimo2(rate_type))
619 return lq_sta->active_mimo2_rate;
621 return lq_sta->active_mimo3_rate;
625 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
628 u8 high = IWL_RATE_INVALID;
629 u8 low = IWL_RATE_INVALID;
631 /* 802.11A or ht walks to the next literal adjacent rate in
633 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
637 /* Find the previous rate that is in the rate mask */
639 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
640 if (rate_mask & mask) {
646 /* Find the next rate that is in the rate mask */
648 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
649 if (rate_mask & mask) {
655 return (high << 8) | low;
659 while (low != IWL_RATE_INVALID) {
660 low = iwl_rates[low].prev_rs;
661 if (low == IWL_RATE_INVALID)
663 if (rate_mask & (1 << low))
665 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
669 while (high != IWL_RATE_INVALID) {
670 high = iwl_rates[high].next_rs;
671 if (high == IWL_RATE_INVALID)
673 if (rate_mask & (1 << high))
675 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
678 return (high << 8) | low;
681 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
682 struct iwl_scale_tbl_info *tbl,
683 u8 scale_index, u8 ht_possible)
688 u8 switch_to_legacy = 0;
689 u8 is_green = lq_sta->is_green;
690 struct iwl_priv *priv = lq_sta->drv;
692 /* check if we need to switch from HT to legacy rates.
693 * assumption is that mandatory rates (1Mbps or 6Mbps)
694 * are always supported (spec demand) */
695 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
696 switch_to_legacy = 1;
697 scale_index = rs_ht_to_legacy[scale_index];
698 if (lq_sta->band == IEEE80211_BAND_5GHZ)
703 if (num_of_ant(tbl->ant_type) > 1)
705 first_antenna(priv->hw_params.valid_tx_ant);
709 tbl->max_search = IWL_MAX_SEARCH;
712 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
714 /* Mask with station rate restriction */
715 if (is_legacy(tbl->lq_type)) {
716 /* supp_rates has no CCK bits in A mode */
717 if (lq_sta->band == IEEE80211_BAND_5GHZ)
718 rate_mask = (u16)(rate_mask &
719 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
721 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
724 /* If we switched from HT to legacy, check current rate */
725 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
730 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
732 low = high_low & 0xff;
734 if (low == IWL_RATE_INVALID)
738 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
742 * Simple function to compare two rate scale table types
744 static bool table_type_matches(struct iwl_scale_tbl_info *a,
745 struct iwl_scale_tbl_info *b)
747 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
748 (a->is_SGI == b->is_SGI);
752 * mac80211 sends us Tx status
754 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
755 struct ieee80211_sta *sta, void *priv_sta,
760 int rs_index, mac_index, i;
761 struct iwl_lq_sta *lq_sta = priv_sta;
762 struct iwl_link_quality_cmd *table;
763 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
764 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
765 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
766 enum mac80211_rate_control_flags mac_flags;
768 struct iwl_scale_tbl_info tbl_type;
769 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
771 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
773 /* Treat uninitialized rate scaling data same as non-existing. */
775 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
777 } else if (!lq_sta->drv) {
778 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
782 if (!ieee80211_is_data(hdr->frame_control) ||
783 info->flags & IEEE80211_TX_CTL_NO_ACK)
786 /* This packet was aggregated but doesn't carry status info */
787 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
788 !(info->flags & IEEE80211_TX_STAT_AMPDU))
792 * Ignore this Tx frame response if its initial rate doesn't match
793 * that of latest Link Quality command. There may be stragglers
794 * from a previous Link Quality command, but we're no longer interested
795 * in those; they're either from the "active" mode while we're trying
796 * to check "search" mode, or a prior "search" mode after we've moved
797 * to a new "search" mode (which might become the new "active" mode).
800 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
801 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
802 if (priv->band == IEEE80211_BAND_5GHZ)
803 rs_index -= IWL_FIRST_OFDM_RATE;
804 mac_flags = info->status.rates[0].flags;
805 mac_index = info->status.rates[0].idx;
806 /* For HT packets, map MCS to PLCP */
807 if (mac_flags & IEEE80211_TX_RC_MCS) {
808 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
809 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
812 * mac80211 HT index is always zero-indexed; we need to move
813 * HT OFDM rates after CCK rates in 2.4 GHz band
815 if (priv->band == IEEE80211_BAND_2GHZ)
816 mac_index += IWL_FIRST_OFDM_RATE;
818 /* Here we actually compare this rate to the latest LQ command */
819 if ((mac_index < 0) ||
820 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
821 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
822 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
823 (tbl_type.ant_type != info->antenna_sel_tx) ||
824 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
825 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
826 (rs_index != mac_index)) {
827 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
829 * Since rates mis-match, the last LQ command may have failed.
830 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
833 lq_sta->missed_rate_counter++;
834 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
835 lq_sta->missed_rate_counter = 0;
836 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
838 /* Regardless, ignore this status info for outdated rate */
841 /* Rate did match, so reset the missed_rate_counter */
842 lq_sta->missed_rate_counter = 0;
844 /* Figure out if rate scale algorithm is in active or search table */
845 if (table_type_matches(&tbl_type,
846 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
847 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
848 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
849 } else if (table_type_matches(&tbl_type,
850 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
851 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
852 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
854 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
859 * Updating the frame history depends on whether packets were
862 * For aggregation, all packets were transmitted at the same rate, the
863 * first index into rate scale table.
865 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
866 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
867 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
869 rs_collect_tx_data(curr_tbl, rs_index,
870 info->status.ampdu_len,
871 info->status.ampdu_ack_len);
873 /* Update success/fail counts if not searching for new mode */
874 if (lq_sta->stay_in_tbl) {
875 lq_sta->total_success += info->status.ampdu_ack_len;
876 lq_sta->total_failed += (info->status.ampdu_len -
877 info->status.ampdu_ack_len);
881 * For legacy, update frame history with for each Tx retry.
883 retries = info->status.rates[0].count - 1;
884 /* HW doesn't send more than 15 retries */
885 retries = min(retries, 15);
887 /* The last transmission may have been successful */
888 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
889 /* Collect data for each rate used during failed TX attempts */
890 for (i = 0; i <= retries; ++i) {
891 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
892 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
893 &tbl_type, &rs_index);
895 * Only collect stats if retried rate is in the same RS
896 * table as active/search.
898 if (table_type_matches(&tbl_type, curr_tbl))
900 else if (table_type_matches(&tbl_type, other_tbl))
904 rs_collect_tx_data(tmp_tbl, rs_index, 1,
905 i < retries ? 0 : legacy_success);
908 /* Update success/fail counts if not searching for new mode */
909 if (lq_sta->stay_in_tbl) {
910 lq_sta->total_success += legacy_success;
911 lq_sta->total_failed += retries + (1 - legacy_success);
914 /* The last TX rate is cached in lq_sta; it's set in if/else above */
915 lq_sta->last_rate_n_flags = tx_rate;
917 /* See if there's a better rate or modulation mode to try. */
918 if (sta && sta->supp_rates[sband->band])
919 rs_rate_scale_perform(priv, skb, sta, lq_sta);
923 * Begin a period of staying with a selected modulation mode.
924 * Set "stay_in_tbl" flag to prevent any mode switches.
925 * Set frame tx success limits according to legacy vs. high-throughput,
926 * and reset overall (spanning all rates) tx success history statistics.
927 * These control how long we stay using same modulation mode before
928 * searching for a new mode.
930 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
931 struct iwl_lq_sta *lq_sta)
933 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
934 lq_sta->stay_in_tbl = 1; /* only place this gets set */
936 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
937 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
938 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
940 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
941 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
942 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
944 lq_sta->table_count = 0;
945 lq_sta->total_failed = 0;
946 lq_sta->total_success = 0;
947 lq_sta->flush_timer = jiffies;
948 lq_sta->action_counter = 0;
952 * Find correct throughput table for given mode of modulation
954 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
955 struct iwl_scale_tbl_info *tbl)
957 /* Used to choose among HT tables */
958 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
960 /* Check for invalid LQ type */
961 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
962 tbl->expected_tpt = expected_tpt_legacy;
966 /* Legacy rates have only one table */
967 if (is_legacy(tbl->lq_type)) {
968 tbl->expected_tpt = expected_tpt_legacy;
972 /* Choose among many HT tables depending on number of streams
973 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
975 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
976 ht_tbl_pointer = expected_tpt_siso20MHz;
977 else if (is_siso(tbl->lq_type))
978 ht_tbl_pointer = expected_tpt_siso40MHz;
979 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
980 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
981 else if (is_mimo2(tbl->lq_type))
982 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
983 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
984 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
985 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
986 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
988 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
989 tbl->expected_tpt = ht_tbl_pointer[0];
990 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
991 tbl->expected_tpt = ht_tbl_pointer[1];
992 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
993 tbl->expected_tpt = ht_tbl_pointer[2];
995 tbl->expected_tpt = ht_tbl_pointer[3];
999 * Find starting rate for new "search" high-throughput mode of modulation.
1000 * Goal is to find lowest expected rate (under perfect conditions) that is
1001 * above the current measured throughput of "active" mode, to give new mode
1002 * a fair chance to prove itself without too many challenges.
1004 * This gets called when transitioning to more aggressive modulation
1005 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1006 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1007 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1008 * bit rate will typically need to increase, but not if performance was bad.
1010 static s32 rs_get_best_rate(struct iwl_priv *priv,
1011 struct iwl_lq_sta *lq_sta,
1012 struct iwl_scale_tbl_info *tbl, /* "search" */
1013 u16 rate_mask, s8 index)
1015 /* "active" values */
1016 struct iwl_scale_tbl_info *active_tbl =
1017 &(lq_sta->lq_info[lq_sta->active_tbl]);
1018 s32 active_sr = active_tbl->win[index].success_ratio;
1019 s32 active_tpt = active_tbl->expected_tpt[index];
1021 /* expected "search" throughput */
1022 s32 *tpt_tbl = tbl->expected_tpt;
1024 s32 new_rate, high, low, start_hi;
1028 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1031 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1034 low = high_low & 0xff;
1035 high = (high_low >> 8) & 0xff;
1038 * Lower the "search" bit rate, to give new "search" mode
1039 * approximately the same throughput as "active" if:
1041 * 1) "Active" mode has been working modestly well (but not
1042 * great), and expected "search" throughput (under perfect
1043 * conditions) at candidate rate is above the actual
1044 * measured "active" throughput (but less than expected
1045 * "active" throughput under perfect conditions).
1047 * 2) "Active" mode has been working perfectly or very well
1048 * and expected "search" throughput (under perfect
1049 * conditions) at candidate rate is above expected
1050 * "active" throughput (under perfect conditions).
1052 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1053 ((active_sr > IWL_RATE_DECREASE_TH) &&
1054 (active_sr <= IWL_RATE_HIGH_TH) &&
1055 (tpt_tbl[rate] <= active_tpt))) ||
1056 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1057 (tpt_tbl[rate] > active_tpt))) {
1059 /* (2nd or later pass)
1060 * If we've already tried to raise the rate, and are
1061 * now trying to lower it, use the higher rate. */
1062 if (start_hi != IWL_RATE_INVALID) {
1063 new_rate = start_hi;
1069 /* Loop again with lower rate */
1070 if (low != IWL_RATE_INVALID)
1073 /* Lower rate not available, use the original */
1077 /* Else try to raise the "search" rate to match "active" */
1079 /* (2nd or later pass)
1080 * If we've already tried to lower the rate, and are
1081 * now trying to raise it, use the lower rate. */
1082 if (new_rate != IWL_RATE_INVALID)
1085 /* Loop again with higher rate */
1086 else if (high != IWL_RATE_INVALID) {
1090 /* Higher rate not available, use the original */
1102 * Set up search table for MIMO2
1104 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1105 struct iwl_lq_sta *lq_sta,
1106 struct ieee80211_conf *conf,
1107 struct ieee80211_sta *sta,
1108 struct iwl_scale_tbl_info *tbl, int index)
1112 s8 is_green = lq_sta->is_green;
1114 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1117 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1118 == WLAN_HT_CAP_SM_PS_STATIC)
1121 /* Need both Tx chains/antennas to support MIMO */
1122 if (priv->hw_params.tx_chains_num < 2)
1125 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1127 tbl->lq_type = LQ_MIMO2;
1128 tbl->is_dup = lq_sta->is_dup;
1130 tbl->max_search = IWL_MAX_SEARCH;
1131 rate_mask = lq_sta->active_mimo2_rate;
1133 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1138 rs_set_expected_tpt_table(lq_sta, tbl);
1140 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1142 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1143 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1144 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1148 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1150 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1151 tbl->current_rate, is_green);
1156 * Set up search table for MIMO3
1158 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1159 struct iwl_lq_sta *lq_sta,
1160 struct ieee80211_conf *conf,
1161 struct ieee80211_sta *sta,
1162 struct iwl_scale_tbl_info *tbl, int index)
1166 s8 is_green = lq_sta->is_green;
1168 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1171 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1172 == WLAN_HT_CAP_SM_PS_STATIC)
1175 /* Need both Tx chains/antennas to support MIMO */
1176 if (priv->hw_params.tx_chains_num < 3)
1179 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1181 tbl->lq_type = LQ_MIMO3;
1182 tbl->is_dup = lq_sta->is_dup;
1184 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1185 rate_mask = lq_sta->active_mimo3_rate;
1187 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1192 rs_set_expected_tpt_table(lq_sta, tbl);
1194 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1196 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1198 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1199 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1203 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1205 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1206 tbl->current_rate, is_green);
1211 * Set up search table for SISO
1213 static int rs_switch_to_siso(struct iwl_priv *priv,
1214 struct iwl_lq_sta *lq_sta,
1215 struct ieee80211_conf *conf,
1216 struct ieee80211_sta *sta,
1217 struct iwl_scale_tbl_info *tbl, int index)
1220 u8 is_green = lq_sta->is_green;
1223 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1226 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1228 tbl->is_dup = lq_sta->is_dup;
1229 tbl->lq_type = LQ_SISO;
1231 tbl->max_search = IWL_MAX_SEARCH;
1232 rate_mask = lq_sta->active_siso_rate;
1234 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1240 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1242 rs_set_expected_tpt_table(lq_sta, tbl);
1243 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1245 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1246 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1247 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1251 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1252 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1253 tbl->current_rate, is_green);
1258 * Try to switch to new modulation mode from legacy
1260 static int rs_move_legacy_other(struct iwl_priv *priv,
1261 struct iwl_lq_sta *lq_sta,
1262 struct ieee80211_conf *conf,
1263 struct ieee80211_sta *sta,
1266 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1267 struct iwl_scale_tbl_info *search_tbl =
1268 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1269 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1270 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1271 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1272 u8 start_action = tbl->action;
1273 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1274 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1276 u8 update_search_tbl_counter = 0;
1278 if (!iwl_ht_enabled(priv))
1279 /* stay in Legacy */
1280 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1281 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1282 tbl->action > IWL_LEGACY_SWITCH_SISO)
1283 tbl->action = IWL_LEGACY_SWITCH_SISO;
1285 lq_sta->action_counter++;
1286 switch (tbl->action) {
1287 case IWL_LEGACY_SWITCH_ANTENNA1:
1288 case IWL_LEGACY_SWITCH_ANTENNA2:
1289 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1291 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1292 tx_chains_num <= 1) ||
1293 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1294 tx_chains_num <= 2))
1297 /* Don't change antenna if success has been great */
1298 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1301 /* Set up search table to try other antenna */
1302 memcpy(search_tbl, tbl, sz);
1304 if (rs_toggle_antenna(valid_tx_ant,
1305 &search_tbl->current_rate, search_tbl)) {
1306 update_search_tbl_counter = 1;
1307 rs_set_expected_tpt_table(lq_sta, search_tbl);
1311 case IWL_LEGACY_SWITCH_SISO:
1312 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1314 /* Set up search table to try SISO */
1315 memcpy(search_tbl, tbl, sz);
1316 search_tbl->is_SGI = 0;
1317 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1320 lq_sta->action_counter = 0;
1325 case IWL_LEGACY_SWITCH_MIMO2_AB:
1326 case IWL_LEGACY_SWITCH_MIMO2_AC:
1327 case IWL_LEGACY_SWITCH_MIMO2_BC:
1328 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1330 /* Set up search table to try MIMO */
1331 memcpy(search_tbl, tbl, sz);
1332 search_tbl->is_SGI = 0;
1334 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1335 search_tbl->ant_type = ANT_AB;
1336 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1337 search_tbl->ant_type = ANT_AC;
1339 search_tbl->ant_type = ANT_BC;
1341 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1344 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1347 lq_sta->action_counter = 0;
1352 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1353 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1355 /* Set up search table to try MIMO3 */
1356 memcpy(search_tbl, tbl, sz);
1357 search_tbl->is_SGI = 0;
1359 search_tbl->ant_type = ANT_ABC;
1361 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1364 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1367 lq_sta->action_counter = 0;
1373 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1374 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1376 if (tbl->action == start_action)
1380 search_tbl->lq_type = LQ_NONE;
1384 lq_sta->search_better_tbl = 1;
1386 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1387 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1388 if (update_search_tbl_counter)
1389 search_tbl->action = tbl->action;
1395 * Try to switch to new modulation mode from SISO
1397 static int rs_move_siso_to_other(struct iwl_priv *priv,
1398 struct iwl_lq_sta *lq_sta,
1399 struct ieee80211_conf *conf,
1400 struct ieee80211_sta *sta, int index)
1402 u8 is_green = lq_sta->is_green;
1403 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1404 struct iwl_scale_tbl_info *search_tbl =
1405 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1406 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1407 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1408 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1409 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1410 u8 start_action = tbl->action;
1411 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1412 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1413 u8 update_search_tbl_counter = 0;
1416 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1417 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1419 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1422 lq_sta->action_counter++;
1423 switch (tbl->action) {
1424 case IWL_SISO_SWITCH_ANTENNA1:
1425 case IWL_SISO_SWITCH_ANTENNA2:
1426 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1428 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1429 tx_chains_num <= 1) ||
1430 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1431 tx_chains_num <= 2))
1434 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1437 memcpy(search_tbl, tbl, sz);
1438 if (rs_toggle_antenna(valid_tx_ant,
1439 &search_tbl->current_rate, search_tbl)) {
1440 update_search_tbl_counter = 1;
1444 case IWL_SISO_SWITCH_MIMO2_AB:
1445 case IWL_SISO_SWITCH_MIMO2_AC:
1446 case IWL_SISO_SWITCH_MIMO2_BC:
1447 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1448 memcpy(search_tbl, tbl, sz);
1449 search_tbl->is_SGI = 0;
1451 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1452 search_tbl->ant_type = ANT_AB;
1453 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1454 search_tbl->ant_type = ANT_AC;
1456 search_tbl->ant_type = ANT_BC;
1458 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1461 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1466 case IWL_SISO_SWITCH_GI:
1467 if (!tbl->is_ht40 && !(ht_cap->cap &
1468 IEEE80211_HT_CAP_SGI_20))
1470 if (tbl->is_ht40 && !(ht_cap->cap &
1471 IEEE80211_HT_CAP_SGI_40))
1474 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1476 memcpy(search_tbl, tbl, sz);
1482 "SGI was set in GF+SISO\n");
1484 search_tbl->is_SGI = !tbl->is_SGI;
1485 rs_set_expected_tpt_table(lq_sta, search_tbl);
1487 s32 tpt = lq_sta->last_tpt / 100;
1488 if (tpt >= search_tbl->expected_tpt[index])
1491 search_tbl->current_rate =
1492 rate_n_flags_from_tbl(priv, search_tbl,
1494 update_search_tbl_counter = 1;
1496 case IWL_SISO_SWITCH_MIMO3_ABC:
1497 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1498 memcpy(search_tbl, tbl, sz);
1499 search_tbl->is_SGI = 0;
1500 search_tbl->ant_type = ANT_ABC;
1502 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1505 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1512 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1513 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1515 if (tbl->action == start_action)
1518 search_tbl->lq_type = LQ_NONE;
1522 lq_sta->search_better_tbl = 1;
1524 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1525 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1526 if (update_search_tbl_counter)
1527 search_tbl->action = tbl->action;
1533 * Try to switch to new modulation mode from MIMO2
1535 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1536 struct iwl_lq_sta *lq_sta,
1537 struct ieee80211_conf *conf,
1538 struct ieee80211_sta *sta, int index)
1540 s8 is_green = lq_sta->is_green;
1541 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1542 struct iwl_scale_tbl_info *search_tbl =
1543 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1544 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1545 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1546 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1547 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1548 u8 start_action = tbl->action;
1549 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1550 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1551 u8 update_search_tbl_counter = 0;
1554 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1555 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1556 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1557 /* switch in SISO */
1558 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1561 lq_sta->action_counter++;
1562 switch (tbl->action) {
1563 case IWL_MIMO2_SWITCH_ANTENNA1:
1564 case IWL_MIMO2_SWITCH_ANTENNA2:
1565 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1567 if (tx_chains_num <= 2)
1570 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1573 memcpy(search_tbl, tbl, sz);
1574 if (rs_toggle_antenna(valid_tx_ant,
1575 &search_tbl->current_rate, search_tbl)) {
1576 update_search_tbl_counter = 1;
1580 case IWL_MIMO2_SWITCH_SISO_A:
1581 case IWL_MIMO2_SWITCH_SISO_B:
1582 case IWL_MIMO2_SWITCH_SISO_C:
1583 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1585 /* Set up new search table for SISO */
1586 memcpy(search_tbl, tbl, sz);
1588 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1589 search_tbl->ant_type = ANT_A;
1590 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1591 search_tbl->ant_type = ANT_B;
1593 search_tbl->ant_type = ANT_C;
1595 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1598 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1605 case IWL_MIMO2_SWITCH_GI:
1606 if (!tbl->is_ht40 && !(ht_cap->cap &
1607 IEEE80211_HT_CAP_SGI_20))
1609 if (tbl->is_ht40 && !(ht_cap->cap &
1610 IEEE80211_HT_CAP_SGI_40))
1613 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1615 /* Set up new search table for MIMO2 */
1616 memcpy(search_tbl, tbl, sz);
1617 search_tbl->is_SGI = !tbl->is_SGI;
1618 rs_set_expected_tpt_table(lq_sta, search_tbl);
1620 * If active table already uses the fastest possible
1621 * modulation (dual stream with short guard interval),
1622 * and it's working well, there's no need to look
1623 * for a better type of modulation!
1626 s32 tpt = lq_sta->last_tpt / 100;
1627 if (tpt >= search_tbl->expected_tpt[index])
1630 search_tbl->current_rate =
1631 rate_n_flags_from_tbl(priv, search_tbl,
1633 update_search_tbl_counter = 1;
1636 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1637 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1638 memcpy(search_tbl, tbl, sz);
1639 search_tbl->is_SGI = 0;
1640 search_tbl->ant_type = ANT_ABC;
1642 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1645 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1653 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1654 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1656 if (tbl->action == start_action)
1659 search_tbl->lq_type = LQ_NONE;
1662 lq_sta->search_better_tbl = 1;
1664 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1665 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1666 if (update_search_tbl_counter)
1667 search_tbl->action = tbl->action;
1674 * Try to switch to new modulation mode from MIMO3
1676 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1677 struct iwl_lq_sta *lq_sta,
1678 struct ieee80211_conf *conf,
1679 struct ieee80211_sta *sta, int index)
1681 s8 is_green = lq_sta->is_green;
1682 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1683 struct iwl_scale_tbl_info *search_tbl =
1684 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1685 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1686 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1687 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1688 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1689 u8 start_action = tbl->action;
1690 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1691 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1693 u8 update_search_tbl_counter = 0;
1695 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1696 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1697 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1698 /* switch in SISO */
1699 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1702 lq_sta->action_counter++;
1703 switch (tbl->action) {
1704 case IWL_MIMO3_SWITCH_ANTENNA1:
1705 case IWL_MIMO3_SWITCH_ANTENNA2:
1706 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1708 if (tx_chains_num <= 3)
1711 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1714 memcpy(search_tbl, tbl, sz);
1715 if (rs_toggle_antenna(valid_tx_ant,
1716 &search_tbl->current_rate, search_tbl))
1719 case IWL_MIMO3_SWITCH_SISO_A:
1720 case IWL_MIMO3_SWITCH_SISO_B:
1721 case IWL_MIMO3_SWITCH_SISO_C:
1722 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1724 /* Set up new search table for SISO */
1725 memcpy(search_tbl, tbl, sz);
1727 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1728 search_tbl->ant_type = ANT_A;
1729 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1730 search_tbl->ant_type = ANT_B;
1732 search_tbl->ant_type = ANT_C;
1734 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1737 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1744 case IWL_MIMO3_SWITCH_MIMO2_AB:
1745 case IWL_MIMO3_SWITCH_MIMO2_AC:
1746 case IWL_MIMO3_SWITCH_MIMO2_BC:
1747 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1749 memcpy(search_tbl, tbl, sz);
1750 search_tbl->is_SGI = 0;
1751 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1752 search_tbl->ant_type = ANT_AB;
1753 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1754 search_tbl->ant_type = ANT_AC;
1756 search_tbl->ant_type = ANT_BC;
1758 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1761 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1768 case IWL_MIMO3_SWITCH_GI:
1769 if (!tbl->is_ht40 && !(ht_cap->cap &
1770 IEEE80211_HT_CAP_SGI_20))
1772 if (tbl->is_ht40 && !(ht_cap->cap &
1773 IEEE80211_HT_CAP_SGI_40))
1776 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1778 /* Set up new search table for MIMO */
1779 memcpy(search_tbl, tbl, sz);
1780 search_tbl->is_SGI = !tbl->is_SGI;
1781 rs_set_expected_tpt_table(lq_sta, search_tbl);
1783 * If active table already uses the fastest possible
1784 * modulation (dual stream with short guard interval),
1785 * and it's working well, there's no need to look
1786 * for a better type of modulation!
1789 s32 tpt = lq_sta->last_tpt / 100;
1790 if (tpt >= search_tbl->expected_tpt[index])
1793 search_tbl->current_rate =
1794 rate_n_flags_from_tbl(priv, search_tbl,
1796 update_search_tbl_counter = 1;
1800 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1801 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1803 if (tbl->action == start_action)
1806 search_tbl->lq_type = LQ_NONE;
1809 lq_sta->search_better_tbl = 1;
1811 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1812 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1813 if (update_search_tbl_counter)
1814 search_tbl->action = tbl->action;
1821 * Check whether we should continue using same modulation mode, or
1822 * begin search for a new mode, based on:
1823 * 1) # tx successes or failures while using this mode
1824 * 2) # times calling this function
1825 * 3) elapsed time in this mode (not used, for now)
1827 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1829 struct iwl_scale_tbl_info *tbl;
1832 int flush_interval_passed = 0;
1833 struct iwl_priv *priv;
1836 active_tbl = lq_sta->active_tbl;
1838 tbl = &(lq_sta->lq_info[active_tbl]);
1840 /* If we've been disallowing search, see if we should now allow it */
1841 if (lq_sta->stay_in_tbl) {
1843 /* Elapsed time using current modulation mode */
1844 if (lq_sta->flush_timer)
1845 flush_interval_passed =
1847 (unsigned long)(lq_sta->flush_timer +
1848 IWL_RATE_SCALE_FLUSH_INTVL));
1851 * Check if we should allow search for new modulation mode.
1852 * If many frames have failed or succeeded, or we've used
1853 * this same modulation for a long time, allow search, and
1854 * reset history stats that keep track of whether we should
1855 * allow a new search. Also (below) reset all bitmaps and
1856 * stats in active history.
1858 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1859 (lq_sta->total_success > lq_sta->max_success_limit) ||
1860 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1861 && (flush_interval_passed))) {
1862 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1863 lq_sta->total_failed,
1864 lq_sta->total_success,
1865 flush_interval_passed);
1867 /* Allow search for new mode */
1868 lq_sta->stay_in_tbl = 0; /* only place reset */
1869 lq_sta->total_failed = 0;
1870 lq_sta->total_success = 0;
1871 lq_sta->flush_timer = 0;
1874 * Else if we've used this modulation mode enough repetitions
1875 * (regardless of elapsed time or success/failure), reset
1876 * history bitmaps and rate-specific stats for all rates in
1880 lq_sta->table_count++;
1881 if (lq_sta->table_count >=
1882 lq_sta->table_count_limit) {
1883 lq_sta->table_count = 0;
1885 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1886 for (i = 0; i < IWL_RATE_COUNT; i++)
1887 rs_rate_scale_clear_window(
1892 /* If transitioning to allow "search", reset all history
1893 * bitmaps and stats in active table (this will become the new
1894 * "search" table). */
1895 if (!lq_sta->stay_in_tbl) {
1896 for (i = 0; i < IWL_RATE_COUNT; i++)
1897 rs_rate_scale_clear_window(&(tbl->win[i]));
1903 * setup rate table in uCode
1904 * return rate_n_flags as used in the table
1906 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
1907 struct iwl_lq_sta *lq_sta,
1908 struct iwl_scale_tbl_info *tbl,
1909 int index, u8 is_green)
1913 /* Update uCode's rate table. */
1914 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1915 rs_fill_link_cmd(priv, lq_sta, rate);
1916 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
1922 * Do rate scaling and search for new modulation mode.
1924 static void rs_rate_scale_perform(struct iwl_priv *priv,
1925 struct sk_buff *skb,
1926 struct ieee80211_sta *sta,
1927 struct iwl_lq_sta *lq_sta)
1929 struct ieee80211_hw *hw = priv->hw;
1930 struct ieee80211_conf *conf = &hw->conf;
1931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1932 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1933 int low = IWL_RATE_INVALID;
1934 int high = IWL_RATE_INVALID;
1937 struct iwl_rate_scale_data *window = NULL;
1938 int current_tpt = IWL_INVALID_VALUE;
1939 int low_tpt = IWL_INVALID_VALUE;
1940 int high_tpt = IWL_INVALID_VALUE;
1942 s8 scale_action = 0;
1945 struct iwl_scale_tbl_info *tbl, *tbl1;
1946 u16 rate_scale_index_msk = 0;
1953 u8 tid = MAX_TID_COUNT;
1954 struct iwl_tid_data *tid_data;
1956 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
1958 /* Send management frames and NO_ACK data using lowest rate. */
1959 /* TODO: this could probably be improved.. */
1960 if (!ieee80211_is_data(hdr->frame_control) ||
1961 info->flags & IEEE80211_TX_CTL_NO_ACK)
1964 if (!sta || !lq_sta)
1967 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1969 tid = rs_tl_add_packet(lq_sta, hdr);
1970 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1971 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1972 if (tid_data->agg.state == IWL_AGG_OFF)
1980 * Select rate-scale / modulation-mode table to work with in
1981 * the rest of this function: "search" if searching for better
1982 * modulation mode, or "active" if doing rate scaling within a mode.
1984 if (!lq_sta->search_better_tbl)
1985 active_tbl = lq_sta->active_tbl;
1987 active_tbl = 1 - lq_sta->active_tbl;
1989 tbl = &(lq_sta->lq_info[active_tbl]);
1990 if (is_legacy(tbl->lq_type))
1991 lq_sta->is_green = 0;
1993 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
1994 is_green = lq_sta->is_green;
1996 /* current tx rate */
1997 index = lq_sta->last_txrate_idx;
1999 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2002 /* rates available for this association, and for modulation mode */
2003 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2005 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2007 /* mask with station rate restriction */
2008 if (is_legacy(tbl->lq_type)) {
2009 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2010 /* supp_rates has no CCK bits in A mode */
2011 rate_scale_index_msk = (u16) (rate_mask &
2012 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2014 rate_scale_index_msk = (u16) (rate_mask &
2015 lq_sta->supp_rates);
2018 rate_scale_index_msk = rate_mask;
2020 if (!rate_scale_index_msk)
2021 rate_scale_index_msk = rate_mask;
2023 if (!((1 << index) & rate_scale_index_msk)) {
2024 IWL_ERR(priv, "Current Rate is not valid\n");
2025 if (lq_sta->search_better_tbl) {
2026 /* revert to active table if search table is not valid*/
2027 tbl->lq_type = LQ_NONE;
2028 lq_sta->search_better_tbl = 0;
2029 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2030 /* get "active" rate info */
2031 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2032 rate = rs_update_rate_tbl(priv, lq_sta,
2033 tbl, index, is_green);
2038 /* Get expected throughput table and history window for current rate */
2039 if (!tbl->expected_tpt) {
2040 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2044 /* force user max rate if set by user */
2045 if ((lq_sta->max_rate_idx != -1) &&
2046 (lq_sta->max_rate_idx < index)) {
2047 index = lq_sta->max_rate_idx;
2049 window = &(tbl->win[index]);
2053 window = &(tbl->win[index]);
2056 * If there is not enough history to calculate actual average
2057 * throughput, keep analyzing results of more tx frames, without
2058 * changing rate or mode (bypass most of the rest of this function).
2059 * Set up new rate table in uCode only if old rate is not supported
2060 * in current association (use new rate found above).
2062 fail_count = window->counter - window->success_counter;
2063 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2064 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2065 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2067 window->success_counter, window->counter, index);
2069 /* Can't calculate this yet; not enough history */
2070 window->average_tpt = IWL_INVALID_VALUE;
2072 /* Should we stay with this modulation mode,
2073 * or search for a new one? */
2074 rs_stay_in_table(lq_sta);
2078 /* Else we have enough samples; calculate estimate of
2079 * actual average throughput */
2080 if (window->average_tpt != ((window->success_ratio *
2081 tbl->expected_tpt[index] + 64) / 128)) {
2082 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2083 window->average_tpt = ((window->success_ratio *
2084 tbl->expected_tpt[index] + 64) / 128);
2087 /* If we are searching for better modulation mode, check success. */
2088 if (lq_sta->search_better_tbl &&
2089 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2090 /* If good success, continue using the "search" mode;
2091 * no need to send new link quality command, since we're
2092 * continuing to use the setup that we've been trying. */
2093 if (window->average_tpt > lq_sta->last_tpt) {
2095 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2096 "suc=%d cur-tpt=%d old-tpt=%d\n",
2097 window->success_ratio,
2098 window->average_tpt,
2101 if (!is_legacy(tbl->lq_type))
2102 lq_sta->enable_counter = 1;
2104 /* Swap tables; "search" becomes "active" */
2105 lq_sta->active_tbl = active_tbl;
2106 current_tpt = window->average_tpt;
2108 /* Else poor success; go back to mode in "active" table */
2111 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2112 "suc=%d cur-tpt=%d old-tpt=%d\n",
2113 window->success_ratio,
2114 window->average_tpt,
2117 /* Nullify "search" table */
2118 tbl->lq_type = LQ_NONE;
2120 /* Revert to "active" table */
2121 active_tbl = lq_sta->active_tbl;
2122 tbl = &(lq_sta->lq_info[active_tbl]);
2124 /* Revert to "active" rate and throughput info */
2125 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2126 current_tpt = lq_sta->last_tpt;
2128 /* Need to set up a new rate table in uCode */
2132 /* Either way, we've made a decision; modulation mode
2133 * search is done, allow rate adjustment next time. */
2134 lq_sta->search_better_tbl = 0;
2135 done_search = 1; /* Don't switch modes below! */
2139 /* (Else) not in search of better modulation mode, try for better
2140 * starting rate, while staying in this mode. */
2141 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2143 low = high_low & 0xff;
2144 high = (high_low >> 8) & 0xff;
2146 /* If user set max rate, dont allow higher than user constrain */
2147 if ((lq_sta->max_rate_idx != -1) &&
2148 (lq_sta->max_rate_idx < high))
2149 high = IWL_RATE_INVALID;
2151 sr = window->success_ratio;
2153 /* Collect measured throughputs for current and adjacent rates */
2154 current_tpt = window->average_tpt;
2155 if (low != IWL_RATE_INVALID)
2156 low_tpt = tbl->win[low].average_tpt;
2157 if (high != IWL_RATE_INVALID)
2158 high_tpt = tbl->win[high].average_tpt;
2162 /* Too many failures, decrease rate */
2163 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2164 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2167 /* No throughput measured yet for adjacent rates; try increase. */
2168 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2169 (high_tpt == IWL_INVALID_VALUE)) {
2171 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2173 else if (low != IWL_RATE_INVALID)
2177 /* Both adjacent throughputs are measured, but neither one has better
2178 * throughput; we're using the best rate, don't change it! */
2179 else if ((low_tpt != IWL_INVALID_VALUE) &&
2180 (high_tpt != IWL_INVALID_VALUE) &&
2181 (low_tpt < current_tpt) &&
2182 (high_tpt < current_tpt))
2185 /* At least one adjacent rate's throughput is measured,
2186 * and may have better performance. */
2188 /* Higher adjacent rate's throughput is measured */
2189 if (high_tpt != IWL_INVALID_VALUE) {
2190 /* Higher rate has better throughput */
2191 if (high_tpt > current_tpt &&
2192 sr >= IWL_RATE_INCREASE_TH) {
2198 /* Lower adjacent rate's throughput is measured */
2199 } else if (low_tpt != IWL_INVALID_VALUE) {
2200 /* Lower rate has better throughput */
2201 if (low_tpt > current_tpt) {
2202 IWL_DEBUG_RATE(priv,
2203 "decrease rate because of low tpt\n");
2205 } else if (sr >= IWL_RATE_INCREASE_TH) {
2211 /* Sanity check; asked for decrease, but success rate or throughput
2212 * has been good at old rate. Don't change it. */
2213 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2214 ((sr > IWL_RATE_HIGH_TH) ||
2215 (current_tpt > (100 * tbl->expected_tpt[low]))))
2217 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2219 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2220 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2222 switch (scale_action) {
2224 /* Decrease starting rate, update uCode's rate table */
2225 if (low != IWL_RATE_INVALID) {
2232 /* Increase starting rate, update uCode's rate table */
2233 if (high != IWL_RATE_INVALID) {
2245 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2246 "high %d type %d\n",
2247 index, scale_action, low, high, tbl->lq_type);
2250 /* Replace uCode's rate table for the destination station. */
2252 rate = rs_update_rate_tbl(priv, lq_sta,
2253 tbl, index, is_green);
2255 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2256 /* Should we stay with this modulation mode,
2257 * or search for a new one? */
2258 rs_stay_in_table(lq_sta);
2261 * Search for new modulation mode if we're:
2262 * 1) Not changing rates right now
2263 * 2) Not just finishing up a search
2264 * 3) Allowing a new search
2266 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2267 /* Save current throughput to compare with "search" throughput*/
2268 lq_sta->last_tpt = current_tpt;
2270 /* Select a new "search" modulation mode to try.
2271 * If one is found, set up the new "search" table. */
2272 if (is_legacy(tbl->lq_type))
2273 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2274 else if (is_siso(tbl->lq_type))
2275 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2276 else if (is_mimo2(tbl->lq_type))
2277 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2279 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2281 /* If new "search" mode was selected, set up in uCode table */
2282 if (lq_sta->search_better_tbl) {
2283 /* Access the "search" table, clear its history. */
2284 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2285 for (i = 0; i < IWL_RATE_COUNT; i++)
2286 rs_rate_scale_clear_window(&(tbl->win[i]));
2288 /* Use new "search" start rate */
2289 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2291 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2292 tbl->current_rate, index);
2293 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2294 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
2299 if (done_search && !lq_sta->stay_in_tbl) {
2300 /* If the "active" (non-search) mode was legacy,
2301 * and we've tried switching antennas,
2302 * but we haven't been able to try HT modes (not available),
2303 * stay with best antenna legacy modulation for a while
2304 * before next round of mode comparisons. */
2305 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2306 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2307 lq_sta->action_counter > tbl1->max_search) {
2308 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2309 rs_set_stay_in_table(priv, 1, lq_sta);
2312 /* If we're in an HT mode, and all 3 mode switch actions
2313 * have been tried and compared, stay in this best modulation
2314 * mode for a while before next round of mode comparisons. */
2315 if (lq_sta->enable_counter &&
2316 (lq_sta->action_counter >= tbl1->max_search) &&
2317 iwl_ht_enabled(priv)) {
2318 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2319 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2320 (tid != MAX_TID_COUNT)) {
2322 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2323 if (tid_data->agg.state == IWL_AGG_OFF) {
2324 IWL_DEBUG_RATE(priv,
2325 "try to aggregate tid %d\n",
2327 rs_tl_turn_on_agg(priv, tid,
2331 rs_set_stay_in_table(priv, 0, lq_sta);
2336 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2338 lq_sta->last_txrate_idx = i;
2344 * rs_initialize_lq - Initialize a station's hardware rate table
2346 * The uCode's station table contains a table of fallback rates
2347 * for automatic fallback during transmission.
2349 * NOTE: This sets up a default set of values. These will be replaced later
2350 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2353 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2354 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2355 * which requires station table entry to exist).
2357 static void rs_initialize_lq(struct iwl_priv *priv,
2358 struct ieee80211_conf *conf,
2359 struct ieee80211_sta *sta,
2360 struct iwl_lq_sta *lq_sta)
2362 struct iwl_scale_tbl_info *tbl;
2366 u8 use_green = rs_use_green(sta, &priv->current_ht_config);
2370 if (!sta || !lq_sta)
2373 i = lq_sta->last_txrate_idx;
2375 valid_tx_ant = priv->hw_params.valid_tx_ant;
2377 if (!lq_sta->search_better_tbl)
2378 active_tbl = lq_sta->active_tbl;
2380 active_tbl = 1 - lq_sta->active_tbl;
2382 tbl = &(lq_sta->lq_info[active_tbl]);
2384 if ((i < 0) || (i >= IWL_RATE_COUNT))
2387 rate = iwl_rates[i].plcp;
2388 tbl->ant_type = first_antenna(valid_tx_ant);
2389 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2391 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2392 rate |= RATE_MCS_CCK_MSK;
2394 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2395 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2396 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2398 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2399 tbl->current_rate = rate;
2400 rs_set_expected_tpt_table(lq_sta, tbl);
2401 rs_fill_link_cmd(NULL, lq_sta, rate);
2402 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2403 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_SYNC, true);
2408 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2409 struct ieee80211_tx_rate_control *txrc)
2412 struct sk_buff *skb = txrc->skb;
2413 struct ieee80211_supported_band *sband = txrc->sband;
2414 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2415 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2416 struct iwl_lq_sta *lq_sta = priv_sta;
2419 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2421 /* Get max rate if user set max rate */
2423 lq_sta->max_rate_idx = txrc->max_rate_idx;
2424 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2425 (lq_sta->max_rate_idx != -1))
2426 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2427 if ((lq_sta->max_rate_idx < 0) ||
2428 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2429 lq_sta->max_rate_idx = -1;
2432 /* Treat uninitialized rate scaling data same as non-existing. */
2433 if (lq_sta && !lq_sta->drv) {
2434 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2438 /* Send management frames and NO_ACK data using lowest rate. */
2439 if (rate_control_send_low(sta, priv_sta, txrc))
2442 rate_idx = lq_sta->last_txrate_idx;
2444 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2445 rate_idx -= IWL_FIRST_OFDM_RATE;
2446 /* 6M and 9M shared same MCS index */
2447 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2448 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2449 IWL_RATE_MIMO3_6M_PLCP)
2450 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2451 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2452 IWL_RATE_MIMO2_6M_PLCP)
2453 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2454 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2455 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2456 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2457 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2458 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2459 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2460 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2461 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2462 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2464 /* Check for invalid rates */
2465 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2466 ((sband->band == IEEE80211_BAND_5GHZ) &&
2467 (rate_idx < IWL_FIRST_OFDM_RATE)))
2468 rate_idx = rate_lowest_index(sband, sta);
2469 /* On valid 5 GHz rate, adjust index */
2470 else if (sband->band == IEEE80211_BAND_5GHZ)
2471 rate_idx -= IWL_FIRST_OFDM_RATE;
2472 info->control.rates[0].flags = 0;
2474 info->control.rates[0].idx = rate_idx;
2478 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2481 struct iwl_lq_sta *lq_sta;
2482 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2483 struct iwl_priv *priv;
2485 priv = (struct iwl_priv *)priv_rate;
2486 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2488 lq_sta = &sta_priv->lq_sta;
2494 * Called after adding a new station to initialize rate scaling
2496 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2499 struct ieee80211_hw *hw = priv->hw;
2500 struct ieee80211_conf *conf = &priv->hw->conf;
2501 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2502 struct iwl_station_priv *sta_priv;
2503 struct iwl_lq_sta *lq_sta;
2504 struct ieee80211_supported_band *sband;
2506 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2507 lq_sta = &sta_priv->lq_sta;
2508 sband = hw->wiphy->bands[conf->channel->band];
2511 lq_sta->lq.sta_id = sta_id;
2513 for (j = 0; j < LQ_SIZE; j++)
2514 for (i = 0; i < IWL_RATE_COUNT; i++)
2515 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2517 lq_sta->flush_timer = 0;
2518 lq_sta->supp_rates = sta->supp_rates[sband->band];
2519 for (j = 0; j < LQ_SIZE; j++)
2520 for (i = 0; i < IWL_RATE_COUNT; i++)
2521 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2523 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2525 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2526 * the lowest or the highest rate.. Could consider using RSSI from
2527 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2531 lq_sta->max_rate_idx = -1;
2532 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2533 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2534 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2535 lq_sta->band = priv->band;
2537 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2538 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2540 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2541 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2542 lq_sta->active_siso_rate &= ~((u16)0x2);
2543 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2546 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2547 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2548 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2549 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2551 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2552 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2553 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2554 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2556 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2557 lq_sta->active_siso_rate,
2558 lq_sta->active_mimo2_rate,
2559 lq_sta->active_mimo3_rate);
2561 /* These values will be overridden later */
2562 lq_sta->lq.general_params.single_stream_ant_msk =
2563 first_antenna(priv->hw_params.valid_tx_ant);
2564 lq_sta->lq.general_params.dual_stream_ant_msk =
2565 priv->hw_params.valid_tx_ant &
2566 ~first_antenna(priv->hw_params.valid_tx_ant);
2567 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2568 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2569 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2570 lq_sta->lq.general_params.dual_stream_ant_msk =
2571 priv->hw_params.valid_tx_ant;
2574 /* as default allow aggregation for all tids */
2575 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2578 /* Set last_txrate_idx to lowest rate */
2579 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2580 if (sband->band == IEEE80211_BAND_5GHZ)
2581 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2584 rs_initialize_lq(priv, conf, sta, lq_sta);
2587 static void rs_fill_link_cmd(struct iwl_priv *priv,
2588 struct iwl_lq_sta *lq_sta, u32 new_rate)
2590 struct iwl_scale_tbl_info tbl_type;
2593 int repeat_rate = 0;
2594 u8 ant_toggle_cnt = 0;
2595 u8 use_ht_possible = 1;
2596 u8 valid_tx_ant = 0;
2597 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2599 /* Override starting rate (index 0) if needed for debug purposes */
2600 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2602 /* Interpret new_rate (rate_n_flags) */
2603 memset(&tbl_type, 0, sizeof(tbl_type));
2604 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2605 &tbl_type, &rate_idx);
2607 /* How many times should we repeat the initial rate? */
2608 if (is_legacy(tbl_type.lq_type)) {
2610 repeat_rate = IWL_NUMBER_TRY;
2612 repeat_rate = IWL_HT_NUMBER_TRY;
2615 lq_cmd->general_params.mimo_delimiter =
2616 is_mimo(tbl_type.lq_type) ? 1 : 0;
2618 /* Fill 1st table entry (index 0) */
2619 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2621 if (num_of_ant(tbl_type.ant_type) == 1) {
2622 lq_cmd->general_params.single_stream_ant_msk =
2624 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2625 lq_cmd->general_params.dual_stream_ant_msk =
2627 } /* otherwise we don't modify the existing value */
2633 valid_tx_ant = priv->hw_params.valid_tx_ant;
2635 /* Fill rest of rate table */
2636 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2637 /* Repeat initial/next rate.
2638 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2639 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2640 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2641 if (is_legacy(tbl_type.lq_type)) {
2642 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2645 rs_toggle_antenna(valid_tx_ant,
2646 &new_rate, &tbl_type))
2650 /* Override next rate if needed for debug purposes */
2651 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2653 /* Fill next table entry */
2654 lq_cmd->rs_table[index].rate_n_flags =
2655 cpu_to_le32(new_rate);
2660 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2663 /* Indicate to uCode which entries might be MIMO.
2664 * If initial rate was MIMO, this will finally end up
2665 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2666 if (is_mimo(tbl_type.lq_type))
2667 lq_cmd->general_params.mimo_delimiter = index;
2670 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2673 /* How many times should we repeat the next rate? */
2674 if (is_legacy(tbl_type.lq_type)) {
2675 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2678 rs_toggle_antenna(valid_tx_ant,
2679 &new_rate, &tbl_type))
2682 repeat_rate = IWL_NUMBER_TRY;
2684 repeat_rate = IWL_HT_NUMBER_TRY;
2687 /* Don't allow HT rates after next pass.
2688 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2689 use_ht_possible = 0;
2691 /* Override next rate if needed for debug purposes */
2692 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2694 /* Fill next table entry */
2695 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2701 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2702 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2703 lq_cmd->agg_params.agg_time_limit =
2704 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2707 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2711 /* rate scale requires free function to be implemented */
2712 static void rs_free(void *priv_rate)
2717 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2720 struct iwl_priv *priv __maybe_unused = priv_r;
2722 IWL_DEBUG_RATE(priv, "enter\n");
2723 IWL_DEBUG_RATE(priv, "leave\n");
2727 #ifdef CONFIG_MAC80211_DEBUGFS
2728 static int open_file_generic(struct inode *inode, struct file *file)
2730 file->private_data = inode->i_private;
2733 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2734 u32 *rate_n_flags, int index)
2736 struct iwl_priv *priv;
2741 valid_tx_ant = priv->hw_params.valid_tx_ant;
2742 if (lq_sta->dbg_fixed_rate) {
2744 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2745 >> RATE_MCS_ANT_POS);
2746 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2747 *rate_n_flags = lq_sta->dbg_fixed_rate;
2748 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2750 lq_sta->dbg_fixed_rate = 0;
2752 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2753 ant_sel_tx, valid_tx_ant);
2754 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2757 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2761 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2762 const char __user *user_buf, size_t count, loff_t *ppos)
2764 struct iwl_lq_sta *lq_sta = file->private_data;
2765 struct iwl_priv *priv;
2771 memset(buf, 0, sizeof(buf));
2772 buf_size = min(count, sizeof(buf) - 1);
2773 if (copy_from_user(buf, user_buf, buf_size))
2776 if (sscanf(buf, "%x", &parsed_rate) == 1)
2777 lq_sta->dbg_fixed_rate = parsed_rate;
2779 lq_sta->dbg_fixed_rate = 0;
2781 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2782 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2783 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2784 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2786 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2787 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2789 if (lq_sta->dbg_fixed_rate) {
2790 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2791 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2797 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2798 char __user *user_buf, size_t count, loff_t *ppos)
2806 struct iwl_lq_sta *lq_sta = file->private_data;
2807 struct iwl_priv *priv;
2808 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2811 buff = kmalloc(1024, GFP_KERNEL);
2815 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2816 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2817 lq_sta->total_failed, lq_sta->total_success,
2818 lq_sta->active_legacy_rate);
2819 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2820 lq_sta->dbg_fixed_rate);
2821 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2822 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2823 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2824 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2825 desc += sprintf(buff+desc, "lq type %s\n",
2826 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2827 if (is_Ht(tbl->lq_type)) {
2828 desc += sprintf(buff+desc, " %s",
2829 (is_siso(tbl->lq_type)) ? "SISO" :
2830 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2831 desc += sprintf(buff+desc, " %s",
2832 (tbl->is_ht40) ? "40MHz" : "20MHz");
2833 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2834 (lq_sta->is_green) ? "GF enabled" : "",
2835 (lq_sta->is_agg) ? "AGG on" : "");
2837 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2838 lq_sta->last_rate_n_flags);
2839 desc += sprintf(buff+desc, "general:"
2840 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2841 lq_sta->lq.general_params.flags,
2842 lq_sta->lq.general_params.mimo_delimiter,
2843 lq_sta->lq.general_params.single_stream_ant_msk,
2844 lq_sta->lq.general_params.dual_stream_ant_msk);
2846 desc += sprintf(buff+desc, "agg:"
2847 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2848 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2849 lq_sta->lq.agg_params.agg_dis_start_th,
2850 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2852 desc += sprintf(buff+desc,
2853 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2854 lq_sta->lq.general_params.start_rate_index[0],
2855 lq_sta->lq.general_params.start_rate_index[1],
2856 lq_sta->lq.general_params.start_rate_index[2],
2857 lq_sta->lq.general_params.start_rate_index[3]);
2859 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2860 index = iwl_hwrate_to_plcp_idx(
2861 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2862 if (is_legacy(tbl->lq_type)) {
2863 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2864 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2865 iwl_rate_mcs[index].mbps);
2867 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2868 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2869 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2873 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2878 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2879 .write = rs_sta_dbgfs_scale_table_write,
2880 .read = rs_sta_dbgfs_scale_table_read,
2881 .open = open_file_generic,
2883 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2884 char __user *user_buf, size_t count, loff_t *ppos)
2891 struct iwl_lq_sta *lq_sta = file->private_data;
2893 buff = kmalloc(1024, GFP_KERNEL);
2897 for (i = 0; i < LQ_SIZE; i++) {
2898 desc += sprintf(buff+desc,
2899 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2901 lq_sta->active_tbl == i ? "*" : "x",
2902 lq_sta->lq_info[i].lq_type,
2903 lq_sta->lq_info[i].is_SGI,
2904 lq_sta->lq_info[i].is_ht40,
2905 lq_sta->lq_info[i].is_dup,
2907 lq_sta->lq_info[i].current_rate);
2908 for (j = 0; j < IWL_RATE_COUNT; j++) {
2909 desc += sprintf(buff+desc,
2910 "counter=%d success=%d %%=%d\n",
2911 lq_sta->lq_info[i].win[j].counter,
2912 lq_sta->lq_info[i].win[j].success_counter,
2913 lq_sta->lq_info[i].win[j].success_ratio);
2916 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2921 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2922 .read = rs_sta_dbgfs_stats_table_read,
2923 .open = open_file_generic,
2926 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2927 char __user *user_buf, size_t count, loff_t *ppos)
2933 struct iwl_lq_sta *lq_sta = file->private_data;
2934 struct iwl_priv *priv;
2935 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2939 if (is_Ht(tbl->lq_type))
2940 desc += sprintf(buff+desc,
2941 "Bit Rate= %d Mb/s\n",
2942 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2944 desc += sprintf(buff+desc,
2945 "Bit Rate= %d Mb/s\n",
2946 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
2948 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2952 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2953 .read = rs_sta_dbgfs_rate_scale_data_read,
2954 .open = open_file_generic,
2957 static void rs_add_debugfs(void *priv, void *priv_sta,
2960 struct iwl_lq_sta *lq_sta = priv_sta;
2961 lq_sta->rs_sta_dbgfs_scale_table_file =
2962 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2963 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2964 lq_sta->rs_sta_dbgfs_stats_table_file =
2965 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2966 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2967 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2968 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
2969 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
2970 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2971 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2972 &lq_sta->tx_agg_tid_en);
2976 static void rs_remove_debugfs(void *priv, void *priv_sta)
2978 struct iwl_lq_sta *lq_sta = priv_sta;
2979 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2980 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2981 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2982 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2987 * Initialization of rate scaling information is done by driver after
2988 * the station is added. Since mac80211 calls this function before a
2989 * station is added we ignore it.
2991 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
2992 struct ieee80211_sta *sta, void *priv_sta)
2995 static struct rate_control_ops rs_ops = {
2998 .tx_status = rs_tx_status,
2999 .get_rate = rs_get_rate,
3000 .rate_init = rs_rate_init_stub,
3003 .alloc_sta = rs_alloc_sta,
3004 .free_sta = rs_free_sta,
3005 #ifdef CONFIG_MAC80211_DEBUGFS
3006 .add_sta_debugfs = rs_add_debugfs,
3007 .remove_sta_debugfs = rs_remove_debugfs,
3011 int iwlagn_rate_control_register(void)
3013 return ieee80211_rate_control_register(&rs_ops);
3016 void iwlagn_rate_control_unregister(void)
3018 ieee80211_rate_control_unregister(&rs_ops);