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>
43 #define RS_NAME "iwl-agn-rs"
45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
46 #define IWL_NUMBER_TRY 1
47 #define IWL_HT_NUMBER_TRY 3
49 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
50 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
51 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53 /* max allowed rate miss before sync LQ cmd */
54 #define IWL_MISSED_RATE_MAX 15
55 /* max time to accum history 2 seconds */
56 #define IWL_RATE_SCALE_FLUSH_INTVL (3*HZ)
58 static u8 rs_ht_to_legacy[] = {
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
62 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
63 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
64 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
65 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
68 static const u8 ant_toggle_lookup[] = {
69 /*ANT_NONE -> */ ANT_NONE,
72 /*ANT_AB -> */ ANT_BC,
74 /*ANT_AC -> */ ANT_AB,
75 /*ANT_BC -> */ ANT_AC,
76 /*ANT_ABC -> */ ANT_ABC,
79 static void rs_rate_scale_perform(struct iwl_priv *priv,
81 struct ieee80211_sta *sta,
82 struct iwl_lq_sta *lq_sta);
83 static void rs_fill_link_cmd(struct iwl_priv *priv,
84 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
87 #ifdef CONFIG_MAC80211_DEBUGFS
88 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
89 u32 *rate_n_flags, int index);
91 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
92 u32 *rate_n_flags, int index)
97 * The following tables contain the expected throughput metrics for all rates
99 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
101 * where invalid entries are zeros.
103 * CCK rates are only valid in legacy table and will only be used in G
107 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
108 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
111 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
112 {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202}, /* Norm */
113 {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210}, /* SGI */
114 {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381}, /* AGG */
115 {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
118 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
119 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
120 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
121 {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
122 {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683}, /* AGG+SGI */
125 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
126 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
127 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
128 {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
129 {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660}, /* AGG+SGI*/
132 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
133 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
134 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
135 {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922}, /* AGG */
136 {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966}, /* AGG+SGI */
139 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
140 {0, 0, 0, 0, 99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
141 {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
142 {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
143 {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
146 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
147 {0, 0, 0, 0, 152, 0, 211, 239, 255, 279, 290, 294, 297}, /* Norm */
148 {0, 0, 0, 0, 160, 0, 219, 245, 261, 284, 294, 297, 300}, /* SGI */
149 {0, 0, 0, 0, 254, 0, 443, 584, 695, 868, 984, 1030, 1070}, /* AGG */
150 {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
154 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
163 { "24", "16QAM 1/2"},
164 { "36", "16QAM 3/4"},
165 { "48", "64QAM 2/3"},
166 { "54", "64QAM 3/4"},
167 { "60", "64QAM 5/6"},
170 #define MCS_INDEX_PER_STREAM (8)
172 static inline u8 rs_extract_rate(u32 rate_n_flags)
174 return (u8)(rate_n_flags & 0xFF);
177 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
180 window->success_counter = 0;
181 window->success_ratio = IWL_INVALID_VALUE;
183 window->average_tpt = IWL_INVALID_VALUE;
187 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
189 return (ant_type & valid_antenna) == ant_type;
193 * removes the old data from the statistics. All data that is older than
194 * TID_MAX_TIME_DIFF, will be deleted.
196 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
198 /* The oldest age we want to keep */
199 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
201 while (tl->queue_count &&
202 (tl->time_stamp < oldest_time)) {
203 tl->total -= tl->packet_count[tl->head];
204 tl->packet_count[tl->head] = 0;
205 tl->time_stamp += TID_QUEUE_CELL_SPACING;
208 if (tl->head >= TID_QUEUE_MAX_SIZE)
214 * increment traffic load value for tid and also remove
215 * any old values if passed the certain time period
217 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
218 struct ieee80211_hdr *hdr)
220 u32 curr_time = jiffies_to_msecs(jiffies);
223 struct iwl_traffic_load *tl = NULL;
226 if (ieee80211_is_data_qos(hdr->frame_control)) {
227 u8 *qc = ieee80211_get_qos_ctl(hdr);
230 return MAX_TID_COUNT;
232 if (unlikely(tid >= TID_MAX_LOAD_COUNT))
233 return MAX_TID_COUNT;
235 tl = &lq_data->load[tid];
237 curr_time -= curr_time % TID_ROUND_VALUE;
239 /* Happens only for the first packet. Initialize the data */
240 if (!(tl->queue_count)) {
242 tl->time_stamp = curr_time;
245 tl->packet_count[0] = 1;
246 return MAX_TID_COUNT;
249 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
250 index = time_diff / TID_QUEUE_CELL_SPACING;
252 /* The history is too long: remove data that is older than */
253 /* TID_MAX_TIME_DIFF */
254 if (index >= TID_QUEUE_MAX_SIZE)
255 rs_tl_rm_old_stats(tl, curr_time);
257 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
258 tl->packet_count[index] = tl->packet_count[index] + 1;
259 tl->total = tl->total + 1;
261 if ((index + 1) > tl->queue_count)
262 tl->queue_count = index + 1;
268 get the traffic load value for tid
270 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
272 u32 curr_time = jiffies_to_msecs(jiffies);
275 struct iwl_traffic_load *tl = NULL;
277 if (tid >= TID_MAX_LOAD_COUNT)
280 tl = &(lq_data->load[tid]);
282 curr_time -= curr_time % TID_ROUND_VALUE;
284 if (!(tl->queue_count))
287 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
288 index = time_diff / TID_QUEUE_CELL_SPACING;
290 /* The history is too long: remove data that is older than */
291 /* TID_MAX_TIME_DIFF */
292 if (index >= TID_QUEUE_MAX_SIZE)
293 rs_tl_rm_old_stats(tl, curr_time);
298 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
299 struct iwl_lq_sta *lq_data, u8 tid,
300 struct ieee80211_sta *sta)
304 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
305 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
307 ret = ieee80211_start_tx_ba_session(sta, tid);
308 if (ret == -EAGAIN) {
310 * driver and mac80211 is out of sync
311 * this might be cause by reloading firmware
312 * stop the tx ba session here
314 IWL_DEBUG_HT(priv, "Fail start Tx agg on tid: %d\n",
316 ieee80211_stop_tx_ba_session(sta, tid,
317 WLAN_BACK_INITIATOR);
320 IWL_ERR(priv, "Fail finding valid aggregation tid: %d\n", tid);
324 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
325 struct iwl_lq_sta *lq_data,
326 struct ieee80211_sta *sta)
328 if ((tid < TID_MAX_LOAD_COUNT) &&
329 !rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta)) {
330 if (priv->cfg->use_rts_for_ht) {
332 * switch to RTS/CTS if it is the prefer protection
333 * method for HT traffic
335 IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
336 priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
337 iwlcore_commit_rxon(priv);
342 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
344 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
345 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
346 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
350 * Static function to get the expected throughput from an iwl_scale_tbl_info
351 * that wraps a NULL pointer check
353 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
355 if (tbl->expected_tpt)
356 return tbl->expected_tpt[rs_index];
361 * rs_collect_tx_data - Update the success/failure sliding window
363 * We keep a sliding window of the last 62 packets transmitted
364 * at this rate. window->data contains the bitmask of successful
367 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
368 int scale_index, int attempts, int successes)
370 struct iwl_rate_scale_data *window = NULL;
371 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
374 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
377 /* Select window for current tx bit rate */
378 window = &(tbl->win[scale_index]);
380 /* Get expected throughput */
381 tpt = get_expected_tpt(tbl, scale_index);
384 * Keep track of only the latest 62 tx frame attempts in this rate's
385 * history window; anything older isn't really relevant any more.
386 * If we have filled up the sliding window, drop the oldest attempt;
387 * if the oldest attempt (highest bit in bitmap) shows "success",
388 * subtract "1" from the success counter (this is the main reason
389 * we keep these bitmaps!).
391 while (attempts > 0) {
392 if (window->counter >= IWL_RATE_MAX_WINDOW) {
394 /* remove earliest */
395 window->counter = IWL_RATE_MAX_WINDOW - 1;
397 if (window->data & mask) {
398 window->data &= ~mask;
399 window->success_counter--;
403 /* Increment frames-attempted counter */
406 /* Shift bitmap by one frame to throw away oldest history */
409 /* Mark the most recent #successes attempts as successful */
411 window->success_counter++;
419 /* Calculate current success ratio, avoid divide-by-0! */
420 if (window->counter > 0)
421 window->success_ratio = 128 * (100 * window->success_counter)
424 window->success_ratio = IWL_INVALID_VALUE;
426 fail_count = window->counter - window->success_counter;
428 /* Calculate average throughput, if we have enough history. */
429 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
430 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
431 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
433 window->average_tpt = IWL_INVALID_VALUE;
435 /* Tag this window as having been updated */
436 window->stamp = jiffies;
442 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
444 /* FIXME:RS:remove this function and put the flags statically in the table */
445 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
446 struct iwl_scale_tbl_info *tbl,
447 int index, u8 use_green)
449 u32 rate_n_flags = 0;
451 if (is_legacy(tbl->lq_type)) {
452 rate_n_flags = iwl_rates[index].plcp;
453 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
454 rate_n_flags |= RATE_MCS_CCK_MSK;
456 } else if (is_Ht(tbl->lq_type)) {
457 if (index > IWL_LAST_OFDM_RATE) {
458 IWL_ERR(priv, "Invalid HT rate index %d\n", index);
459 index = IWL_LAST_OFDM_RATE;
461 rate_n_flags = RATE_MCS_HT_MSK;
463 if (is_siso(tbl->lq_type))
464 rate_n_flags |= iwl_rates[index].plcp_siso;
465 else if (is_mimo2(tbl->lq_type))
466 rate_n_flags |= iwl_rates[index].plcp_mimo2;
468 rate_n_flags |= iwl_rates[index].plcp_mimo3;
470 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
473 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
474 RATE_MCS_ANT_ABC_MSK);
476 if (is_Ht(tbl->lq_type)) {
479 rate_n_flags |= RATE_MCS_DUP_MSK;
481 rate_n_flags |= RATE_MCS_HT40_MSK;
484 rate_n_flags |= RATE_MCS_SGI_MSK;
487 rate_n_flags |= RATE_MCS_GF_MSK;
488 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
489 rate_n_flags &= ~RATE_MCS_SGI_MSK;
490 IWL_ERR(priv, "GF was set with SGI:SISO\n");
498 * Interpret uCode API's rate_n_flags format,
499 * fill "search" or "active" tx mode table.
501 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
502 enum ieee80211_band band,
503 struct iwl_scale_tbl_info *tbl,
506 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
507 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
510 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
512 if (*rate_idx == IWL_RATE_INVALID) {
516 tbl->is_SGI = 0; /* default legacy setup */
519 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
520 tbl->lq_type = LQ_NONE;
521 tbl->max_search = IWL_MAX_SEARCH;
523 /* legacy rate format */
524 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
525 if (num_of_ant == 1) {
526 if (band == IEEE80211_BAND_5GHZ)
533 if (rate_n_flags & RATE_MCS_SGI_MSK)
536 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
537 (rate_n_flags & RATE_MCS_DUP_MSK))
540 if (rate_n_flags & RATE_MCS_DUP_MSK)
543 mcs = rs_extract_rate(rate_n_flags);
546 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
548 tbl->lq_type = LQ_SISO; /*else NONE*/
550 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
552 tbl->lq_type = LQ_MIMO2;
555 if (num_of_ant == 3) {
556 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
557 tbl->lq_type = LQ_MIMO3;
564 /* switch to another antenna/antennas and return 1 */
565 /* if no other valid antenna found, return 0 */
566 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
567 struct iwl_scale_tbl_info *tbl)
571 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
574 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
577 new_ant_type = ant_toggle_lookup[tbl->ant_type];
579 while ((new_ant_type != tbl->ant_type) &&
580 !rs_is_valid_ant(valid_ant, new_ant_type))
581 new_ant_type = ant_toggle_lookup[new_ant_type];
583 if (new_ant_type == tbl->ant_type)
586 tbl->ant_type = new_ant_type;
587 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
588 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
593 * Green-field mode is valid if the station supports it and
594 * there are no non-GF stations present in the BSS.
596 static inline u8 rs_use_green(struct ieee80211_sta *sta,
597 struct iwl_ht_config *ht_conf)
599 return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
600 !(ht_conf->non_GF_STA_present);
604 * rs_get_supported_rates - get the available rates
606 * if management frame or broadcast frame only return
607 * basic available rates.
610 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
611 struct ieee80211_hdr *hdr,
612 enum iwl_table_type rate_type)
614 if (is_legacy(rate_type)) {
615 return lq_sta->active_legacy_rate;
617 if (is_siso(rate_type))
618 return lq_sta->active_siso_rate;
619 else if (is_mimo2(rate_type))
620 return lq_sta->active_mimo2_rate;
622 return lq_sta->active_mimo3_rate;
626 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
629 u8 high = IWL_RATE_INVALID;
630 u8 low = IWL_RATE_INVALID;
632 /* 802.11A or ht walks to the next literal adjacent rate in
634 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
638 /* Find the previous rate that is in the rate mask */
640 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
641 if (rate_mask & mask) {
647 /* Find the next rate that is in the rate mask */
649 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
650 if (rate_mask & mask) {
656 return (high << 8) | low;
660 while (low != IWL_RATE_INVALID) {
661 low = iwl_rates[low].prev_rs;
662 if (low == IWL_RATE_INVALID)
664 if (rate_mask & (1 << low))
666 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
670 while (high != IWL_RATE_INVALID) {
671 high = iwl_rates[high].next_rs;
672 if (high == IWL_RATE_INVALID)
674 if (rate_mask & (1 << high))
676 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
679 return (high << 8) | low;
682 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
683 struct iwl_scale_tbl_info *tbl,
684 u8 scale_index, u8 ht_possible)
689 u8 switch_to_legacy = 0;
690 u8 is_green = lq_sta->is_green;
691 struct iwl_priv *priv = lq_sta->drv;
693 /* check if we need to switch from HT to legacy rates.
694 * assumption is that mandatory rates (1Mbps or 6Mbps)
695 * are always supported (spec demand) */
696 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
697 switch_to_legacy = 1;
698 scale_index = rs_ht_to_legacy[scale_index];
699 if (lq_sta->band == IEEE80211_BAND_5GHZ)
704 if (num_of_ant(tbl->ant_type) > 1)
706 first_antenna(priv->hw_params.valid_tx_ant);
710 tbl->max_search = IWL_MAX_SEARCH;
713 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
715 /* Mask with station rate restriction */
716 if (is_legacy(tbl->lq_type)) {
717 /* supp_rates has no CCK bits in A mode */
718 if (lq_sta->band == IEEE80211_BAND_5GHZ)
719 rate_mask = (u16)(rate_mask &
720 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
722 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
725 /* If we switched from HT to legacy, check current rate */
726 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
731 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
733 low = high_low & 0xff;
735 if (low == IWL_RATE_INVALID)
739 return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
743 * Simple function to compare two rate scale table types
745 static bool table_type_matches(struct iwl_scale_tbl_info *a,
746 struct iwl_scale_tbl_info *b)
748 return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
749 (a->is_SGI == b->is_SGI);
753 * mac80211 sends us Tx status
755 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
756 struct ieee80211_sta *sta, void *priv_sta,
761 int rs_index, mac_index, i;
762 struct iwl_lq_sta *lq_sta = priv_sta;
763 struct iwl_link_quality_cmd *table;
764 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
765 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
766 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
767 enum mac80211_rate_control_flags mac_flags;
769 struct iwl_scale_tbl_info tbl_type;
770 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
772 IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
774 /* Treat uninitialized rate scaling data same as non-existing. */
776 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
778 } else if (!lq_sta->drv) {
779 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
783 if (!ieee80211_is_data(hdr->frame_control) ||
784 info->flags & IEEE80211_TX_CTL_NO_ACK)
787 /* This packet was aggregated but doesn't carry status info */
788 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
789 !(info->flags & IEEE80211_TX_STAT_AMPDU))
793 * Ignore this Tx frame response if its initial rate doesn't match
794 * that of latest Link Quality command. There may be stragglers
795 * from a previous Link Quality command, but we're no longer interested
796 * in those; they're either from the "active" mode while we're trying
797 * to check "search" mode, or a prior "search" mode after we've moved
798 * to a new "search" mode (which might become the new "active" mode).
801 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
802 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
803 if (priv->band == IEEE80211_BAND_5GHZ)
804 rs_index -= IWL_FIRST_OFDM_RATE;
805 mac_flags = info->status.rates[0].flags;
806 mac_index = info->status.rates[0].idx;
807 /* For HT packets, map MCS to PLCP */
808 if (mac_flags & IEEE80211_TX_RC_MCS) {
809 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
810 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
813 * mac80211 HT index is always zero-indexed; we need to move
814 * HT OFDM rates after CCK rates in 2.4 GHz band
816 if (priv->band == IEEE80211_BAND_2GHZ)
817 mac_index += IWL_FIRST_OFDM_RATE;
819 /* Here we actually compare this rate to the latest LQ command */
820 if ((mac_index < 0) ||
821 (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
822 (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
823 (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
824 (tbl_type.ant_type != info->antenna_sel_tx) ||
825 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
826 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
827 (rs_index != mac_index)) {
828 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
830 * Since rates mis-match, the last LQ command may have failed.
831 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
834 lq_sta->missed_rate_counter++;
835 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
836 lq_sta->missed_rate_counter = 0;
837 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
839 /* Regardless, ignore this status info for outdated rate */
842 /* Rate did match, so reset the missed_rate_counter */
843 lq_sta->missed_rate_counter = 0;
845 /* Figure out if rate scale algorithm is in active or search table */
846 if (table_type_matches(&tbl_type,
847 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
848 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
849 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
850 } else if (table_type_matches(&tbl_type,
851 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
852 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
853 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
855 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
860 * Updating the frame history depends on whether packets were
863 * For aggregation, all packets were transmitted at the same rate, the
864 * first index into rate scale table.
866 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
867 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
868 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
870 rs_collect_tx_data(curr_tbl, rs_index,
871 info->status.ampdu_len,
872 info->status.ampdu_ack_len);
874 /* Update success/fail counts if not searching for new mode */
875 if (lq_sta->stay_in_tbl) {
876 lq_sta->total_success += info->status.ampdu_ack_len;
877 lq_sta->total_failed += (info->status.ampdu_len -
878 info->status.ampdu_ack_len);
882 * For legacy, update frame history with for each Tx retry.
884 retries = info->status.rates[0].count - 1;
885 /* HW doesn't send more than 15 retries */
886 retries = min(retries, 15);
888 /* The last transmission may have been successful */
889 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
890 /* Collect data for each rate used during failed TX attempts */
891 for (i = 0; i <= retries; ++i) {
892 tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
893 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
894 &tbl_type, &rs_index);
896 * Only collect stats if retried rate is in the same RS
897 * table as active/search.
899 if (table_type_matches(&tbl_type, curr_tbl))
901 else if (table_type_matches(&tbl_type, other_tbl))
905 rs_collect_tx_data(tmp_tbl, rs_index, 1,
906 i < retries ? 0 : legacy_success);
909 /* Update success/fail counts if not searching for new mode */
910 if (lq_sta->stay_in_tbl) {
911 lq_sta->total_success += legacy_success;
912 lq_sta->total_failed += retries + (1 - legacy_success);
915 /* The last TX rate is cached in lq_sta; it's set in if/else above */
916 lq_sta->last_rate_n_flags = tx_rate;
918 /* See if there's a better rate or modulation mode to try. */
919 if (sta && sta->supp_rates[sband->band])
920 rs_rate_scale_perform(priv, skb, sta, lq_sta);
924 * Begin a period of staying with a selected modulation mode.
925 * Set "stay_in_tbl" flag to prevent any mode switches.
926 * Set frame tx success limits according to legacy vs. high-throughput,
927 * and reset overall (spanning all rates) tx success history statistics.
928 * These control how long we stay using same modulation mode before
929 * searching for a new mode.
931 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
932 struct iwl_lq_sta *lq_sta)
934 IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
935 lq_sta->stay_in_tbl = 1; /* only place this gets set */
937 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
938 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
939 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
941 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
942 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
943 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
945 lq_sta->table_count = 0;
946 lq_sta->total_failed = 0;
947 lq_sta->total_success = 0;
948 lq_sta->flush_timer = jiffies;
949 lq_sta->action_counter = 0;
953 * Find correct throughput table for given mode of modulation
955 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
956 struct iwl_scale_tbl_info *tbl)
958 /* Used to choose among HT tables */
959 s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
961 /* Check for invalid LQ type */
962 if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
963 tbl->expected_tpt = expected_tpt_legacy;
967 /* Legacy rates have only one table */
968 if (is_legacy(tbl->lq_type)) {
969 tbl->expected_tpt = expected_tpt_legacy;
973 /* Choose among many HT tables depending on number of streams
974 * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
976 if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
977 ht_tbl_pointer = expected_tpt_siso20MHz;
978 else if (is_siso(tbl->lq_type))
979 ht_tbl_pointer = expected_tpt_siso40MHz;
980 else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
981 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
982 else if (is_mimo2(tbl->lq_type))
983 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
984 else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
985 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
986 else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
987 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
989 if (!tbl->is_SGI && !lq_sta->is_agg) /* Normal */
990 tbl->expected_tpt = ht_tbl_pointer[0];
991 else if (tbl->is_SGI && !lq_sta->is_agg) /* SGI */
992 tbl->expected_tpt = ht_tbl_pointer[1];
993 else if (!tbl->is_SGI && lq_sta->is_agg) /* AGG */
994 tbl->expected_tpt = ht_tbl_pointer[2];
996 tbl->expected_tpt = ht_tbl_pointer[3];
1000 * Find starting rate for new "search" high-throughput mode of modulation.
1001 * Goal is to find lowest expected rate (under perfect conditions) that is
1002 * above the current measured throughput of "active" mode, to give new mode
1003 * a fair chance to prove itself without too many challenges.
1005 * This gets called when transitioning to more aggressive modulation
1006 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1007 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1008 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1009 * bit rate will typically need to increase, but not if performance was bad.
1011 static s32 rs_get_best_rate(struct iwl_priv *priv,
1012 struct iwl_lq_sta *lq_sta,
1013 struct iwl_scale_tbl_info *tbl, /* "search" */
1014 u16 rate_mask, s8 index)
1016 /* "active" values */
1017 struct iwl_scale_tbl_info *active_tbl =
1018 &(lq_sta->lq_info[lq_sta->active_tbl]);
1019 s32 active_sr = active_tbl->win[index].success_ratio;
1020 s32 active_tpt = active_tbl->expected_tpt[index];
1022 /* expected "search" throughput */
1023 s32 *tpt_tbl = tbl->expected_tpt;
1025 s32 new_rate, high, low, start_hi;
1029 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1032 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1035 low = high_low & 0xff;
1036 high = (high_low >> 8) & 0xff;
1039 * Lower the "search" bit rate, to give new "search" mode
1040 * approximately the same throughput as "active" if:
1042 * 1) "Active" mode has been working modestly well (but not
1043 * great), and expected "search" throughput (under perfect
1044 * conditions) at candidate rate is above the actual
1045 * measured "active" throughput (but less than expected
1046 * "active" throughput under perfect conditions).
1048 * 2) "Active" mode has been working perfectly or very well
1049 * and expected "search" throughput (under perfect
1050 * conditions) at candidate rate is above expected
1051 * "active" throughput (under perfect conditions).
1053 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1054 ((active_sr > IWL_RATE_DECREASE_TH) &&
1055 (active_sr <= IWL_RATE_HIGH_TH) &&
1056 (tpt_tbl[rate] <= active_tpt))) ||
1057 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1058 (tpt_tbl[rate] > active_tpt))) {
1060 /* (2nd or later pass)
1061 * If we've already tried to raise the rate, and are
1062 * now trying to lower it, use the higher rate. */
1063 if (start_hi != IWL_RATE_INVALID) {
1064 new_rate = start_hi;
1070 /* Loop again with lower rate */
1071 if (low != IWL_RATE_INVALID)
1074 /* Lower rate not available, use the original */
1078 /* Else try to raise the "search" rate to match "active" */
1080 /* (2nd or later pass)
1081 * If we've already tried to lower the rate, and are
1082 * now trying to raise it, use the lower rate. */
1083 if (new_rate != IWL_RATE_INVALID)
1086 /* Loop again with higher rate */
1087 else if (high != IWL_RATE_INVALID) {
1091 /* Higher rate not available, use the original */
1103 * Set up search table for MIMO2
1105 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1106 struct iwl_lq_sta *lq_sta,
1107 struct ieee80211_conf *conf,
1108 struct ieee80211_sta *sta,
1109 struct iwl_scale_tbl_info *tbl, int index)
1113 s8 is_green = lq_sta->is_green;
1115 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1118 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1119 == WLAN_HT_CAP_SM_PS_STATIC)
1122 /* Need both Tx chains/antennas to support MIMO */
1123 if (priv->hw_params.tx_chains_num < 2)
1126 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1128 tbl->lq_type = LQ_MIMO2;
1129 tbl->is_dup = lq_sta->is_dup;
1131 tbl->max_search = IWL_MAX_SEARCH;
1132 rate_mask = lq_sta->active_mimo2_rate;
1134 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1139 rs_set_expected_tpt_table(lq_sta, tbl);
1141 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1143 IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1144 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1145 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1149 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1151 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1152 tbl->current_rate, is_green);
1157 * Set up search table for MIMO3
1159 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1160 struct iwl_lq_sta *lq_sta,
1161 struct ieee80211_conf *conf,
1162 struct ieee80211_sta *sta,
1163 struct iwl_scale_tbl_info *tbl, int index)
1167 s8 is_green = lq_sta->is_green;
1169 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1172 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1173 == WLAN_HT_CAP_SM_PS_STATIC)
1176 /* Need both Tx chains/antennas to support MIMO */
1177 if (priv->hw_params.tx_chains_num < 3)
1180 IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1182 tbl->lq_type = LQ_MIMO3;
1183 tbl->is_dup = lq_sta->is_dup;
1185 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1186 rate_mask = lq_sta->active_mimo3_rate;
1188 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1193 rs_set_expected_tpt_table(lq_sta, tbl);
1195 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1197 IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1199 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1200 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1204 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1206 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1207 tbl->current_rate, is_green);
1212 * Set up search table for SISO
1214 static int rs_switch_to_siso(struct iwl_priv *priv,
1215 struct iwl_lq_sta *lq_sta,
1216 struct ieee80211_conf *conf,
1217 struct ieee80211_sta *sta,
1218 struct iwl_scale_tbl_info *tbl, int index)
1221 u8 is_green = lq_sta->is_green;
1224 if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1227 IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1229 tbl->is_dup = lq_sta->is_dup;
1230 tbl->lq_type = LQ_SISO;
1232 tbl->max_search = IWL_MAX_SEARCH;
1233 rate_mask = lq_sta->active_siso_rate;
1235 if (iwl_is_ht40_tx_allowed(priv, &sta->ht_cap))
1241 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1243 rs_set_expected_tpt_table(lq_sta, tbl);
1244 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1246 IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1247 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1248 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1252 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1253 IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1254 tbl->current_rate, is_green);
1259 * Try to switch to new modulation mode from legacy
1261 static int rs_move_legacy_other(struct iwl_priv *priv,
1262 struct iwl_lq_sta *lq_sta,
1263 struct ieee80211_conf *conf,
1264 struct ieee80211_sta *sta,
1267 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1268 struct iwl_scale_tbl_info *search_tbl =
1269 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1270 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1271 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1272 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1273 u8 start_action = tbl->action;
1274 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1275 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1277 u8 update_search_tbl_counter = 0;
1279 if (!iwl_ht_enabled(priv))
1280 /* stay in Legacy */
1281 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1282 else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1283 tbl->action > IWL_LEGACY_SWITCH_SISO)
1284 tbl->action = IWL_LEGACY_SWITCH_SISO;
1286 lq_sta->action_counter++;
1287 switch (tbl->action) {
1288 case IWL_LEGACY_SWITCH_ANTENNA1:
1289 case IWL_LEGACY_SWITCH_ANTENNA2:
1290 IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1292 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1293 tx_chains_num <= 1) ||
1294 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1295 tx_chains_num <= 2))
1298 /* Don't change antenna if success has been great */
1299 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1302 /* Set up search table to try other antenna */
1303 memcpy(search_tbl, tbl, sz);
1305 if (rs_toggle_antenna(valid_tx_ant,
1306 &search_tbl->current_rate, search_tbl)) {
1307 update_search_tbl_counter = 1;
1308 rs_set_expected_tpt_table(lq_sta, search_tbl);
1312 case IWL_LEGACY_SWITCH_SISO:
1313 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1315 /* Set up search table to try SISO */
1316 memcpy(search_tbl, tbl, sz);
1317 search_tbl->is_SGI = 0;
1318 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1321 lq_sta->action_counter = 0;
1326 case IWL_LEGACY_SWITCH_MIMO2_AB:
1327 case IWL_LEGACY_SWITCH_MIMO2_AC:
1328 case IWL_LEGACY_SWITCH_MIMO2_BC:
1329 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1331 /* Set up search table to try MIMO */
1332 memcpy(search_tbl, tbl, sz);
1333 search_tbl->is_SGI = 0;
1335 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1336 search_tbl->ant_type = ANT_AB;
1337 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1338 search_tbl->ant_type = ANT_AC;
1340 search_tbl->ant_type = ANT_BC;
1342 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1345 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1348 lq_sta->action_counter = 0;
1353 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1354 IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1356 /* Set up search table to try MIMO3 */
1357 memcpy(search_tbl, tbl, sz);
1358 search_tbl->is_SGI = 0;
1360 search_tbl->ant_type = ANT_ABC;
1362 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1365 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1368 lq_sta->action_counter = 0;
1374 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1375 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1377 if (tbl->action == start_action)
1381 search_tbl->lq_type = LQ_NONE;
1385 lq_sta->search_better_tbl = 1;
1387 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1388 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1389 if (update_search_tbl_counter)
1390 search_tbl->action = tbl->action;
1396 * Try to switch to new modulation mode from SISO
1398 static int rs_move_siso_to_other(struct iwl_priv *priv,
1399 struct iwl_lq_sta *lq_sta,
1400 struct ieee80211_conf *conf,
1401 struct ieee80211_sta *sta, int index)
1403 u8 is_green = lq_sta->is_green;
1404 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1405 struct iwl_scale_tbl_info *search_tbl =
1406 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1407 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1408 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1409 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1410 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1411 u8 start_action = tbl->action;
1412 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1413 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1414 u8 update_search_tbl_counter = 0;
1417 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1418 tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1420 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1423 lq_sta->action_counter++;
1424 switch (tbl->action) {
1425 case IWL_SISO_SWITCH_ANTENNA1:
1426 case IWL_SISO_SWITCH_ANTENNA2:
1427 IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1429 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1430 tx_chains_num <= 1) ||
1431 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1432 tx_chains_num <= 2))
1435 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1438 memcpy(search_tbl, tbl, sz);
1439 if (rs_toggle_antenna(valid_tx_ant,
1440 &search_tbl->current_rate, search_tbl)) {
1441 update_search_tbl_counter = 1;
1445 case IWL_SISO_SWITCH_MIMO2_AB:
1446 case IWL_SISO_SWITCH_MIMO2_AC:
1447 case IWL_SISO_SWITCH_MIMO2_BC:
1448 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1449 memcpy(search_tbl, tbl, sz);
1450 search_tbl->is_SGI = 0;
1452 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1453 search_tbl->ant_type = ANT_AB;
1454 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1455 search_tbl->ant_type = ANT_AC;
1457 search_tbl->ant_type = ANT_BC;
1459 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1462 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1467 case IWL_SISO_SWITCH_GI:
1468 if (!tbl->is_ht40 && !(ht_cap->cap &
1469 IEEE80211_HT_CAP_SGI_20))
1471 if (tbl->is_ht40 && !(ht_cap->cap &
1472 IEEE80211_HT_CAP_SGI_40))
1475 IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1477 memcpy(search_tbl, tbl, sz);
1483 "SGI was set in GF+SISO\n");
1485 search_tbl->is_SGI = !tbl->is_SGI;
1486 rs_set_expected_tpt_table(lq_sta, search_tbl);
1488 s32 tpt = lq_sta->last_tpt / 100;
1489 if (tpt >= search_tbl->expected_tpt[index])
1492 search_tbl->current_rate =
1493 rate_n_flags_from_tbl(priv, search_tbl,
1495 update_search_tbl_counter = 1;
1497 case IWL_SISO_SWITCH_MIMO3_ABC:
1498 IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1499 memcpy(search_tbl, tbl, sz);
1500 search_tbl->is_SGI = 0;
1501 search_tbl->ant_type = ANT_ABC;
1503 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1506 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1513 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1514 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1516 if (tbl->action == start_action)
1519 search_tbl->lq_type = LQ_NONE;
1523 lq_sta->search_better_tbl = 1;
1525 if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1526 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1527 if (update_search_tbl_counter)
1528 search_tbl->action = tbl->action;
1534 * Try to switch to new modulation mode from MIMO2
1536 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1537 struct iwl_lq_sta *lq_sta,
1538 struct ieee80211_conf *conf,
1539 struct ieee80211_sta *sta, int index)
1541 s8 is_green = lq_sta->is_green;
1542 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1543 struct iwl_scale_tbl_info *search_tbl =
1544 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1545 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1546 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1547 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1548 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1549 u8 start_action = tbl->action;
1550 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1551 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1552 u8 update_search_tbl_counter = 0;
1555 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1556 (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1557 tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1558 /* switch in SISO */
1559 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1562 lq_sta->action_counter++;
1563 switch (tbl->action) {
1564 case IWL_MIMO2_SWITCH_ANTENNA1:
1565 case IWL_MIMO2_SWITCH_ANTENNA2:
1566 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1568 if (tx_chains_num <= 2)
1571 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1574 memcpy(search_tbl, tbl, sz);
1575 if (rs_toggle_antenna(valid_tx_ant,
1576 &search_tbl->current_rate, search_tbl)) {
1577 update_search_tbl_counter = 1;
1581 case IWL_MIMO2_SWITCH_SISO_A:
1582 case IWL_MIMO2_SWITCH_SISO_B:
1583 case IWL_MIMO2_SWITCH_SISO_C:
1584 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1586 /* Set up new search table for SISO */
1587 memcpy(search_tbl, tbl, sz);
1589 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1590 search_tbl->ant_type = ANT_A;
1591 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1592 search_tbl->ant_type = ANT_B;
1594 search_tbl->ant_type = ANT_C;
1596 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1599 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1606 case IWL_MIMO2_SWITCH_GI:
1607 if (!tbl->is_ht40 && !(ht_cap->cap &
1608 IEEE80211_HT_CAP_SGI_20))
1610 if (tbl->is_ht40 && !(ht_cap->cap &
1611 IEEE80211_HT_CAP_SGI_40))
1614 IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1616 /* Set up new search table for MIMO2 */
1617 memcpy(search_tbl, tbl, sz);
1618 search_tbl->is_SGI = !tbl->is_SGI;
1619 rs_set_expected_tpt_table(lq_sta, search_tbl);
1621 * If active table already uses the fastest possible
1622 * modulation (dual stream with short guard interval),
1623 * and it's working well, there's no need to look
1624 * for a better type of modulation!
1627 s32 tpt = lq_sta->last_tpt / 100;
1628 if (tpt >= search_tbl->expected_tpt[index])
1631 search_tbl->current_rate =
1632 rate_n_flags_from_tbl(priv, search_tbl,
1634 update_search_tbl_counter = 1;
1637 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1638 IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1639 memcpy(search_tbl, tbl, sz);
1640 search_tbl->is_SGI = 0;
1641 search_tbl->ant_type = ANT_ABC;
1643 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1646 ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1654 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1655 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1657 if (tbl->action == start_action)
1660 search_tbl->lq_type = LQ_NONE;
1663 lq_sta->search_better_tbl = 1;
1665 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1666 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1667 if (update_search_tbl_counter)
1668 search_tbl->action = tbl->action;
1675 * Try to switch to new modulation mode from MIMO3
1677 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1678 struct iwl_lq_sta *lq_sta,
1679 struct ieee80211_conf *conf,
1680 struct ieee80211_sta *sta, int index)
1682 s8 is_green = lq_sta->is_green;
1683 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1684 struct iwl_scale_tbl_info *search_tbl =
1685 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1686 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1687 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1688 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1689 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1690 u8 start_action = tbl->action;
1691 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1692 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1694 u8 update_search_tbl_counter = 0;
1696 if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1697 (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1698 tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1699 /* switch in SISO */
1700 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1703 lq_sta->action_counter++;
1704 switch (tbl->action) {
1705 case IWL_MIMO3_SWITCH_ANTENNA1:
1706 case IWL_MIMO3_SWITCH_ANTENNA2:
1707 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
1709 if (tx_chains_num <= 3)
1712 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1715 memcpy(search_tbl, tbl, sz);
1716 if (rs_toggle_antenna(valid_tx_ant,
1717 &search_tbl->current_rate, search_tbl))
1720 case IWL_MIMO3_SWITCH_SISO_A:
1721 case IWL_MIMO3_SWITCH_SISO_B:
1722 case IWL_MIMO3_SWITCH_SISO_C:
1723 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
1725 /* Set up new search table for SISO */
1726 memcpy(search_tbl, tbl, sz);
1728 if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
1729 search_tbl->ant_type = ANT_A;
1730 else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
1731 search_tbl->ant_type = ANT_B;
1733 search_tbl->ant_type = ANT_C;
1735 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1738 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1745 case IWL_MIMO3_SWITCH_MIMO2_AB:
1746 case IWL_MIMO3_SWITCH_MIMO2_AC:
1747 case IWL_MIMO3_SWITCH_MIMO2_BC:
1748 IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
1750 memcpy(search_tbl, tbl, sz);
1751 search_tbl->is_SGI = 0;
1752 if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
1753 search_tbl->ant_type = ANT_AB;
1754 else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
1755 search_tbl->ant_type = ANT_AC;
1757 search_tbl->ant_type = ANT_BC;
1759 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1762 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1769 case IWL_MIMO3_SWITCH_GI:
1770 if (!tbl->is_ht40 && !(ht_cap->cap &
1771 IEEE80211_HT_CAP_SGI_20))
1773 if (tbl->is_ht40 && !(ht_cap->cap &
1774 IEEE80211_HT_CAP_SGI_40))
1777 IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
1779 /* Set up new search table for MIMO */
1780 memcpy(search_tbl, tbl, sz);
1781 search_tbl->is_SGI = !tbl->is_SGI;
1782 rs_set_expected_tpt_table(lq_sta, search_tbl);
1784 * If active table already uses the fastest possible
1785 * modulation (dual stream with short guard interval),
1786 * and it's working well, there's no need to look
1787 * for a better type of modulation!
1790 s32 tpt = lq_sta->last_tpt / 100;
1791 if (tpt >= search_tbl->expected_tpt[index])
1794 search_tbl->current_rate =
1795 rate_n_flags_from_tbl(priv, search_tbl,
1797 update_search_tbl_counter = 1;
1801 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1802 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1804 if (tbl->action == start_action)
1807 search_tbl->lq_type = LQ_NONE;
1810 lq_sta->search_better_tbl = 1;
1812 if (tbl->action > IWL_MIMO3_SWITCH_GI)
1813 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
1814 if (update_search_tbl_counter)
1815 search_tbl->action = tbl->action;
1822 * Check whether we should continue using same modulation mode, or
1823 * begin search for a new mode, based on:
1824 * 1) # tx successes or failures while using this mode
1825 * 2) # times calling this function
1826 * 3) elapsed time in this mode (not used, for now)
1828 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1830 struct iwl_scale_tbl_info *tbl;
1833 int flush_interval_passed = 0;
1834 struct iwl_priv *priv;
1837 active_tbl = lq_sta->active_tbl;
1839 tbl = &(lq_sta->lq_info[active_tbl]);
1841 /* If we've been disallowing search, see if we should now allow it */
1842 if (lq_sta->stay_in_tbl) {
1844 /* Elapsed time using current modulation mode */
1845 if (lq_sta->flush_timer)
1846 flush_interval_passed =
1848 (unsigned long)(lq_sta->flush_timer +
1849 IWL_RATE_SCALE_FLUSH_INTVL));
1852 * Check if we should allow search for new modulation mode.
1853 * If many frames have failed or succeeded, or we've used
1854 * this same modulation for a long time, allow search, and
1855 * reset history stats that keep track of whether we should
1856 * allow a new search. Also (below) reset all bitmaps and
1857 * stats in active history.
1859 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1860 (lq_sta->total_success > lq_sta->max_success_limit) ||
1861 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1862 && (flush_interval_passed))) {
1863 IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
1864 lq_sta->total_failed,
1865 lq_sta->total_success,
1866 flush_interval_passed);
1868 /* Allow search for new mode */
1869 lq_sta->stay_in_tbl = 0; /* only place reset */
1870 lq_sta->total_failed = 0;
1871 lq_sta->total_success = 0;
1872 lq_sta->flush_timer = 0;
1875 * Else if we've used this modulation mode enough repetitions
1876 * (regardless of elapsed time or success/failure), reset
1877 * history bitmaps and rate-specific stats for all rates in
1881 lq_sta->table_count++;
1882 if (lq_sta->table_count >=
1883 lq_sta->table_count_limit) {
1884 lq_sta->table_count = 0;
1886 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
1887 for (i = 0; i < IWL_RATE_COUNT; i++)
1888 rs_rate_scale_clear_window(
1893 /* If transitioning to allow "search", reset all history
1894 * bitmaps and stats in active table (this will become the new
1895 * "search" table). */
1896 if (!lq_sta->stay_in_tbl) {
1897 for (i = 0; i < IWL_RATE_COUNT; i++)
1898 rs_rate_scale_clear_window(&(tbl->win[i]));
1904 * setup rate table in uCode
1905 * return rate_n_flags as used in the table
1907 static u32 rs_update_rate_tbl(struct iwl_priv *priv,
1908 struct iwl_lq_sta *lq_sta,
1909 struct iwl_scale_tbl_info *tbl,
1910 int index, u8 is_green)
1914 /* Update uCode's rate table. */
1915 rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
1916 rs_fill_link_cmd(priv, lq_sta, rate);
1917 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
1923 * Do rate scaling and search for new modulation mode.
1925 static void rs_rate_scale_perform(struct iwl_priv *priv,
1926 struct sk_buff *skb,
1927 struct ieee80211_sta *sta,
1928 struct iwl_lq_sta *lq_sta)
1930 struct ieee80211_hw *hw = priv->hw;
1931 struct ieee80211_conf *conf = &hw->conf;
1932 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1933 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1934 int low = IWL_RATE_INVALID;
1935 int high = IWL_RATE_INVALID;
1938 struct iwl_rate_scale_data *window = NULL;
1939 int current_tpt = IWL_INVALID_VALUE;
1940 int low_tpt = IWL_INVALID_VALUE;
1941 int high_tpt = IWL_INVALID_VALUE;
1943 s8 scale_action = 0;
1946 struct iwl_scale_tbl_info *tbl, *tbl1;
1947 u16 rate_scale_index_msk = 0;
1954 u8 tid = MAX_TID_COUNT;
1955 struct iwl_tid_data *tid_data;
1957 IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
1959 /* Send management frames and NO_ACK data using lowest rate. */
1960 /* TODO: this could probably be improved.. */
1961 if (!ieee80211_is_data(hdr->frame_control) ||
1962 info->flags & IEEE80211_TX_CTL_NO_ACK)
1965 if (!sta || !lq_sta)
1968 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1970 tid = rs_tl_add_packet(lq_sta, hdr);
1971 if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
1972 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
1973 if (tid_data->agg.state == IWL_AGG_OFF)
1981 * Select rate-scale / modulation-mode table to work with in
1982 * the rest of this function: "search" if searching for better
1983 * modulation mode, or "active" if doing rate scaling within a mode.
1985 if (!lq_sta->search_better_tbl)
1986 active_tbl = lq_sta->active_tbl;
1988 active_tbl = 1 - lq_sta->active_tbl;
1990 tbl = &(lq_sta->lq_info[active_tbl]);
1991 if (is_legacy(tbl->lq_type))
1992 lq_sta->is_green = 0;
1994 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
1995 is_green = lq_sta->is_green;
1997 /* current tx rate */
1998 index = lq_sta->last_txrate_idx;
2000 IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2003 /* rates available for this association, and for modulation mode */
2004 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2006 IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2008 /* mask with station rate restriction */
2009 if (is_legacy(tbl->lq_type)) {
2010 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2011 /* supp_rates has no CCK bits in A mode */
2012 rate_scale_index_msk = (u16) (rate_mask &
2013 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2015 rate_scale_index_msk = (u16) (rate_mask &
2016 lq_sta->supp_rates);
2019 rate_scale_index_msk = rate_mask;
2021 if (!rate_scale_index_msk)
2022 rate_scale_index_msk = rate_mask;
2024 if (!((1 << index) & rate_scale_index_msk)) {
2025 IWL_ERR(priv, "Current Rate is not valid\n");
2026 if (lq_sta->search_better_tbl) {
2027 /* revert to active table if search table is not valid*/
2028 tbl->lq_type = LQ_NONE;
2029 lq_sta->search_better_tbl = 0;
2030 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2031 /* get "active" rate info */
2032 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2033 rate = rs_update_rate_tbl(priv, lq_sta,
2034 tbl, index, is_green);
2039 /* Get expected throughput table and history window for current rate */
2040 if (!tbl->expected_tpt) {
2041 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2045 /* force user max rate if set by user */
2046 if ((lq_sta->max_rate_idx != -1) &&
2047 (lq_sta->max_rate_idx < index)) {
2048 index = lq_sta->max_rate_idx;
2050 window = &(tbl->win[index]);
2054 window = &(tbl->win[index]);
2057 * If there is not enough history to calculate actual average
2058 * throughput, keep analyzing results of more tx frames, without
2059 * changing rate or mode (bypass most of the rest of this function).
2060 * Set up new rate table in uCode only if old rate is not supported
2061 * in current association (use new rate found above).
2063 fail_count = window->counter - window->success_counter;
2064 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2065 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2066 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2068 window->success_counter, window->counter, index);
2070 /* Can't calculate this yet; not enough history */
2071 window->average_tpt = IWL_INVALID_VALUE;
2073 /* Should we stay with this modulation mode,
2074 * or search for a new one? */
2075 rs_stay_in_table(lq_sta);
2079 /* Else we have enough samples; calculate estimate of
2080 * actual average throughput */
2081 if (window->average_tpt != ((window->success_ratio *
2082 tbl->expected_tpt[index] + 64) / 128)) {
2083 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2084 window->average_tpt = ((window->success_ratio *
2085 tbl->expected_tpt[index] + 64) / 128);
2088 /* If we are searching for better modulation mode, check success. */
2089 if (lq_sta->search_better_tbl &&
2090 (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2091 /* If good success, continue using the "search" mode;
2092 * no need to send new link quality command, since we're
2093 * continuing to use the setup that we've been trying. */
2094 if (window->average_tpt > lq_sta->last_tpt) {
2096 IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2097 "suc=%d cur-tpt=%d old-tpt=%d\n",
2098 window->success_ratio,
2099 window->average_tpt,
2102 if (!is_legacy(tbl->lq_type))
2103 lq_sta->enable_counter = 1;
2105 /* Swap tables; "search" becomes "active" */
2106 lq_sta->active_tbl = active_tbl;
2107 current_tpt = window->average_tpt;
2109 /* Else poor success; go back to mode in "active" table */
2112 IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2113 "suc=%d cur-tpt=%d old-tpt=%d\n",
2114 window->success_ratio,
2115 window->average_tpt,
2118 /* Nullify "search" table */
2119 tbl->lq_type = LQ_NONE;
2121 /* Revert to "active" table */
2122 active_tbl = lq_sta->active_tbl;
2123 tbl = &(lq_sta->lq_info[active_tbl]);
2125 /* Revert to "active" rate and throughput info */
2126 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2127 current_tpt = lq_sta->last_tpt;
2129 /* Need to set up a new rate table in uCode */
2133 /* Either way, we've made a decision; modulation mode
2134 * search is done, allow rate adjustment next time. */
2135 lq_sta->search_better_tbl = 0;
2136 done_search = 1; /* Don't switch modes below! */
2140 /* (Else) not in search of better modulation mode, try for better
2141 * starting rate, while staying in this mode. */
2142 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2144 low = high_low & 0xff;
2145 high = (high_low >> 8) & 0xff;
2147 /* If user set max rate, dont allow higher than user constrain */
2148 if ((lq_sta->max_rate_idx != -1) &&
2149 (lq_sta->max_rate_idx < high))
2150 high = IWL_RATE_INVALID;
2152 sr = window->success_ratio;
2154 /* Collect measured throughputs for current and adjacent rates */
2155 current_tpt = window->average_tpt;
2156 if (low != IWL_RATE_INVALID)
2157 low_tpt = tbl->win[low].average_tpt;
2158 if (high != IWL_RATE_INVALID)
2159 high_tpt = tbl->win[high].average_tpt;
2163 /* Too many failures, decrease rate */
2164 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2165 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2168 /* No throughput measured yet for adjacent rates; try increase. */
2169 } else if ((low_tpt == IWL_INVALID_VALUE) &&
2170 (high_tpt == IWL_INVALID_VALUE)) {
2172 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2174 else if (low != IWL_RATE_INVALID)
2178 /* Both adjacent throughputs are measured, but neither one has better
2179 * throughput; we're using the best rate, don't change it! */
2180 else if ((low_tpt != IWL_INVALID_VALUE) &&
2181 (high_tpt != IWL_INVALID_VALUE) &&
2182 (low_tpt < current_tpt) &&
2183 (high_tpt < current_tpt))
2186 /* At least one adjacent rate's throughput is measured,
2187 * and may have better performance. */
2189 /* Higher adjacent rate's throughput is measured */
2190 if (high_tpt != IWL_INVALID_VALUE) {
2191 /* Higher rate has better throughput */
2192 if (high_tpt > current_tpt &&
2193 sr >= IWL_RATE_INCREASE_TH) {
2199 /* Lower adjacent rate's throughput is measured */
2200 } else if (low_tpt != IWL_INVALID_VALUE) {
2201 /* Lower rate has better throughput */
2202 if (low_tpt > current_tpt) {
2203 IWL_DEBUG_RATE(priv,
2204 "decrease rate because of low tpt\n");
2206 } else if (sr >= IWL_RATE_INCREASE_TH) {
2212 /* Sanity check; asked for decrease, but success rate or throughput
2213 * has been good at old rate. Don't change it. */
2214 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2215 ((sr > IWL_RATE_HIGH_TH) ||
2216 (current_tpt > (100 * tbl->expected_tpt[low]))))
2218 if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2220 if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2221 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2223 switch (scale_action) {
2225 /* Decrease starting rate, update uCode's rate table */
2226 if (low != IWL_RATE_INVALID) {
2233 /* Increase starting rate, update uCode's rate table */
2234 if (high != IWL_RATE_INVALID) {
2246 IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2247 "high %d type %d\n",
2248 index, scale_action, low, high, tbl->lq_type);
2251 /* Replace uCode's rate table for the destination station. */
2253 rate = rs_update_rate_tbl(priv, lq_sta,
2254 tbl, index, is_green);
2256 if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2257 /* Should we stay with this modulation mode,
2258 * or search for a new one? */
2259 rs_stay_in_table(lq_sta);
2262 * Search for new modulation mode if we're:
2263 * 1) Not changing rates right now
2264 * 2) Not just finishing up a search
2265 * 3) Allowing a new search
2267 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2268 /* Save current throughput to compare with "search" throughput*/
2269 lq_sta->last_tpt = current_tpt;
2271 /* Select a new "search" modulation mode to try.
2272 * If one is found, set up the new "search" table. */
2273 if (is_legacy(tbl->lq_type))
2274 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2275 else if (is_siso(tbl->lq_type))
2276 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2277 else if (is_mimo2(tbl->lq_type))
2278 rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2280 rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2282 /* If new "search" mode was selected, set up in uCode table */
2283 if (lq_sta->search_better_tbl) {
2284 /* Access the "search" table, clear its history. */
2285 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2286 for (i = 0; i < IWL_RATE_COUNT; i++)
2287 rs_rate_scale_clear_window(&(tbl->win[i]));
2289 /* Use new "search" start rate */
2290 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2292 IWL_DEBUG_RATE(priv, "Switch current mcs: %X index: %d\n",
2293 tbl->current_rate, index);
2294 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2295 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC, false);
2300 if (done_search && !lq_sta->stay_in_tbl) {
2301 /* If the "active" (non-search) mode was legacy,
2302 * and we've tried switching antennas,
2303 * but we haven't been able to try HT modes (not available),
2304 * stay with best antenna legacy modulation for a while
2305 * before next round of mode comparisons. */
2306 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2307 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2308 lq_sta->action_counter > tbl1->max_search) {
2309 IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2310 rs_set_stay_in_table(priv, 1, lq_sta);
2313 /* If we're in an HT mode, and all 3 mode switch actions
2314 * have been tried and compared, stay in this best modulation
2315 * mode for a while before next round of mode comparisons. */
2316 if (lq_sta->enable_counter &&
2317 (lq_sta->action_counter >= tbl1->max_search) &&
2318 iwl_ht_enabled(priv)) {
2319 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2320 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2321 (tid != MAX_TID_COUNT)) {
2323 &priv->stations[lq_sta->lq.sta_id].tid[tid];
2324 if (tid_data->agg.state == IWL_AGG_OFF) {
2325 IWL_DEBUG_RATE(priv,
2326 "try to aggregate tid %d\n",
2328 rs_tl_turn_on_agg(priv, tid,
2332 rs_set_stay_in_table(priv, 0, lq_sta);
2337 tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2339 lq_sta->last_txrate_idx = i;
2343 * rs_initialize_lq - Initialize a station's hardware rate table
2345 * The uCode's station table contains a table of fallback rates
2346 * for automatic fallback during transmission.
2348 * NOTE: This sets up a default set of values. These will be replaced later
2349 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2352 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2353 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2354 * which requires station table entry to exist).
2356 static void rs_initialize_lq(struct iwl_priv *priv,
2357 struct ieee80211_conf *conf,
2358 struct ieee80211_sta *sta,
2359 struct iwl_lq_sta *lq_sta)
2361 struct iwl_scale_tbl_info *tbl;
2365 u8 use_green = rs_use_green(sta, &priv->current_ht_config);
2369 if (!sta || !lq_sta)
2372 i = lq_sta->last_txrate_idx;
2374 valid_tx_ant = priv->hw_params.valid_tx_ant;
2376 if (!lq_sta->search_better_tbl)
2377 active_tbl = lq_sta->active_tbl;
2379 active_tbl = 1 - lq_sta->active_tbl;
2381 tbl = &(lq_sta->lq_info[active_tbl]);
2383 if ((i < 0) || (i >= IWL_RATE_COUNT))
2386 rate = iwl_rates[i].plcp;
2387 tbl->ant_type = first_antenna(valid_tx_ant);
2388 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2390 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2391 rate |= RATE_MCS_CCK_MSK;
2393 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2394 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2395 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2397 rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2398 tbl->current_rate = rate;
2399 rs_set_expected_tpt_table(lq_sta, tbl);
2400 rs_fill_link_cmd(NULL, lq_sta, rate);
2401 priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2402 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_SYNC, true);
2407 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2408 struct ieee80211_tx_rate_control *txrc)
2411 struct sk_buff *skb = txrc->skb;
2412 struct ieee80211_supported_band *sband = txrc->sband;
2413 struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2414 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2415 struct iwl_lq_sta *lq_sta = priv_sta;
2418 IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2420 /* Get max rate if user set max rate */
2422 lq_sta->max_rate_idx = txrc->max_rate_idx;
2423 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2424 (lq_sta->max_rate_idx != -1))
2425 lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2426 if ((lq_sta->max_rate_idx < 0) ||
2427 (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2428 lq_sta->max_rate_idx = -1;
2431 /* Treat uninitialized rate scaling data same as non-existing. */
2432 if (lq_sta && !lq_sta->drv) {
2433 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2437 /* Send management frames and NO_ACK data using lowest rate. */
2438 if (rate_control_send_low(sta, priv_sta, txrc))
2441 rate_idx = lq_sta->last_txrate_idx;
2443 if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2444 rate_idx -= IWL_FIRST_OFDM_RATE;
2445 /* 6M and 9M shared same MCS index */
2446 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2447 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2448 IWL_RATE_MIMO3_6M_PLCP)
2449 rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2450 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2451 IWL_RATE_MIMO2_6M_PLCP)
2452 rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2453 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2454 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2455 info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2456 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2457 info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2458 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2459 info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2460 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2461 info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2463 /* Check for invalid rates */
2464 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2465 ((sband->band == IEEE80211_BAND_5GHZ) &&
2466 (rate_idx < IWL_FIRST_OFDM_RATE)))
2467 rate_idx = rate_lowest_index(sband, sta);
2468 /* On valid 5 GHz rate, adjust index */
2469 else if (sband->band == IEEE80211_BAND_5GHZ)
2470 rate_idx -= IWL_FIRST_OFDM_RATE;
2471 info->control.rates[0].flags = 0;
2473 info->control.rates[0].idx = rate_idx;
2477 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2480 struct iwl_lq_sta *lq_sta;
2481 struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2482 struct iwl_priv *priv;
2484 priv = (struct iwl_priv *)priv_rate;
2485 IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2487 lq_sta = &sta_priv->lq_sta;
2493 * Called after adding a new station to initialize rate scaling
2495 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2498 struct ieee80211_hw *hw = priv->hw;
2499 struct ieee80211_conf *conf = &priv->hw->conf;
2500 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2501 struct iwl_station_priv *sta_priv;
2502 struct iwl_lq_sta *lq_sta;
2503 struct ieee80211_supported_band *sband;
2505 sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2506 lq_sta = &sta_priv->lq_sta;
2507 sband = hw->wiphy->bands[conf->channel->band];
2510 lq_sta->lq.sta_id = sta_id;
2512 for (j = 0; j < LQ_SIZE; j++)
2513 for (i = 0; i < IWL_RATE_COUNT; i++)
2514 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2516 lq_sta->flush_timer = 0;
2517 lq_sta->supp_rates = sta->supp_rates[sband->band];
2518 for (j = 0; j < LQ_SIZE; j++)
2519 for (i = 0; i < IWL_RATE_COUNT; i++)
2520 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2522 IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2524 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2525 * the lowest or the highest rate.. Could consider using RSSI from
2526 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2530 lq_sta->max_rate_idx = -1;
2531 lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2532 lq_sta->is_green = rs_use_green(sta, &priv->current_ht_config);
2533 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2534 lq_sta->band = priv->band;
2536 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2537 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2539 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2540 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2541 lq_sta->active_siso_rate &= ~((u16)0x2);
2542 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2545 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2546 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2547 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2548 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2550 lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2551 lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2552 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2553 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2555 IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2556 lq_sta->active_siso_rate,
2557 lq_sta->active_mimo2_rate,
2558 lq_sta->active_mimo3_rate);
2560 /* These values will be overridden later */
2561 lq_sta->lq.general_params.single_stream_ant_msk =
2562 first_antenna(priv->hw_params.valid_tx_ant);
2563 lq_sta->lq.general_params.dual_stream_ant_msk =
2564 priv->hw_params.valid_tx_ant &
2565 ~first_antenna(priv->hw_params.valid_tx_ant);
2566 if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2567 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2568 } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2569 lq_sta->lq.general_params.dual_stream_ant_msk =
2570 priv->hw_params.valid_tx_ant;
2573 /* as default allow aggregation for all tids */
2574 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2577 /* Set last_txrate_idx to lowest rate */
2578 lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2579 if (sband->band == IEEE80211_BAND_5GHZ)
2580 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2583 rs_initialize_lq(priv, conf, sta, lq_sta);
2586 static void rs_fill_link_cmd(struct iwl_priv *priv,
2587 struct iwl_lq_sta *lq_sta, u32 new_rate)
2589 struct iwl_scale_tbl_info tbl_type;
2592 int repeat_rate = 0;
2593 u8 ant_toggle_cnt = 0;
2594 u8 use_ht_possible = 1;
2595 u8 valid_tx_ant = 0;
2596 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2598 /* Override starting rate (index 0) if needed for debug purposes */
2599 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2601 /* Interpret new_rate (rate_n_flags) */
2602 memset(&tbl_type, 0, sizeof(tbl_type));
2603 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2604 &tbl_type, &rate_idx);
2606 /* How many times should we repeat the initial rate? */
2607 if (is_legacy(tbl_type.lq_type)) {
2609 repeat_rate = IWL_NUMBER_TRY;
2611 repeat_rate = IWL_HT_NUMBER_TRY;
2614 lq_cmd->general_params.mimo_delimiter =
2615 is_mimo(tbl_type.lq_type) ? 1 : 0;
2617 /* Fill 1st table entry (index 0) */
2618 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2620 if (num_of_ant(tbl_type.ant_type) == 1) {
2621 lq_cmd->general_params.single_stream_ant_msk =
2623 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2624 lq_cmd->general_params.dual_stream_ant_msk =
2626 } /* otherwise we don't modify the existing value */
2632 valid_tx_ant = priv->hw_params.valid_tx_ant;
2634 /* Fill rest of rate table */
2635 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2636 /* Repeat initial/next rate.
2637 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2638 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2639 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2640 if (is_legacy(tbl_type.lq_type)) {
2641 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2644 rs_toggle_antenna(valid_tx_ant,
2645 &new_rate, &tbl_type))
2649 /* Override next rate if needed for debug purposes */
2650 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2652 /* Fill next table entry */
2653 lq_cmd->rs_table[index].rate_n_flags =
2654 cpu_to_le32(new_rate);
2659 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2662 /* Indicate to uCode which entries might be MIMO.
2663 * If initial rate was MIMO, this will finally end up
2664 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2665 if (is_mimo(tbl_type.lq_type))
2666 lq_cmd->general_params.mimo_delimiter = index;
2669 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2672 /* How many times should we repeat the next rate? */
2673 if (is_legacy(tbl_type.lq_type)) {
2674 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2677 rs_toggle_antenna(valid_tx_ant,
2678 &new_rate, &tbl_type))
2681 repeat_rate = IWL_NUMBER_TRY;
2683 repeat_rate = IWL_HT_NUMBER_TRY;
2686 /* Don't allow HT rates after next pass.
2687 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2688 use_ht_possible = 0;
2690 /* Override next rate if needed for debug purposes */
2691 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2693 /* Fill next table entry */
2694 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2700 lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2701 lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2702 lq_cmd->agg_params.agg_time_limit =
2703 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2706 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2710 /* rate scale requires free function to be implemented */
2711 static void rs_free(void *priv_rate)
2716 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2719 struct iwl_priv *priv __maybe_unused = priv_r;
2721 IWL_DEBUG_RATE(priv, "enter\n");
2722 IWL_DEBUG_RATE(priv, "leave\n");
2726 #ifdef CONFIG_MAC80211_DEBUGFS
2727 static int open_file_generic(struct inode *inode, struct file *file)
2729 file->private_data = inode->i_private;
2732 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2733 u32 *rate_n_flags, int index)
2735 struct iwl_priv *priv;
2740 valid_tx_ant = priv->hw_params.valid_tx_ant;
2741 if (lq_sta->dbg_fixed_rate) {
2743 ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2744 >> RATE_MCS_ANT_POS);
2745 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2746 *rate_n_flags = lq_sta->dbg_fixed_rate;
2747 IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
2749 lq_sta->dbg_fixed_rate = 0;
2751 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2752 ant_sel_tx, valid_tx_ant);
2753 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2756 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
2760 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2761 const char __user *user_buf, size_t count, loff_t *ppos)
2763 struct iwl_lq_sta *lq_sta = file->private_data;
2764 struct iwl_priv *priv;
2770 memset(buf, 0, sizeof(buf));
2771 buf_size = min(count, sizeof(buf) - 1);
2772 if (copy_from_user(buf, user_buf, buf_size))
2775 if (sscanf(buf, "%x", &parsed_rate) == 1)
2776 lq_sta->dbg_fixed_rate = parsed_rate;
2778 lq_sta->dbg_fixed_rate = 0;
2780 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2781 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2782 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2783 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2785 IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
2786 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2788 if (lq_sta->dbg_fixed_rate) {
2789 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2790 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
2796 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2797 char __user *user_buf, size_t count, loff_t *ppos)
2805 struct iwl_lq_sta *lq_sta = file->private_data;
2806 struct iwl_priv *priv;
2807 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2810 buff = kmalloc(1024, GFP_KERNEL);
2814 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2815 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2816 lq_sta->total_failed, lq_sta->total_success,
2817 lq_sta->active_legacy_rate);
2818 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2819 lq_sta->dbg_fixed_rate);
2820 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2821 (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
2822 (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
2823 (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
2824 desc += sprintf(buff+desc, "lq type %s\n",
2825 (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
2826 if (is_Ht(tbl->lq_type)) {
2827 desc += sprintf(buff+desc, " %s",
2828 (is_siso(tbl->lq_type)) ? "SISO" :
2829 ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
2830 desc += sprintf(buff+desc, " %s",
2831 (tbl->is_ht40) ? "40MHz" : "20MHz");
2832 desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
2833 (lq_sta->is_green) ? "GF enabled" : "",
2834 (lq_sta->is_agg) ? "AGG on" : "");
2836 desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2837 lq_sta->last_rate_n_flags);
2838 desc += sprintf(buff+desc, "general:"
2839 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2840 lq_sta->lq.general_params.flags,
2841 lq_sta->lq.general_params.mimo_delimiter,
2842 lq_sta->lq.general_params.single_stream_ant_msk,
2843 lq_sta->lq.general_params.dual_stream_ant_msk);
2845 desc += sprintf(buff+desc, "agg:"
2846 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2847 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2848 lq_sta->lq.agg_params.agg_dis_start_th,
2849 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2851 desc += sprintf(buff+desc,
2852 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2853 lq_sta->lq.general_params.start_rate_index[0],
2854 lq_sta->lq.general_params.start_rate_index[1],
2855 lq_sta->lq.general_params.start_rate_index[2],
2856 lq_sta->lq.general_params.start_rate_index[3]);
2858 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2859 index = iwl_hwrate_to_plcp_idx(
2860 le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2861 if (is_legacy(tbl->lq_type)) {
2862 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
2863 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2864 iwl_rate_mcs[index].mbps);
2866 desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
2867 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
2868 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
2872 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2877 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2878 .write = rs_sta_dbgfs_scale_table_write,
2879 .read = rs_sta_dbgfs_scale_table_read,
2880 .open = open_file_generic,
2882 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2883 char __user *user_buf, size_t count, loff_t *ppos)
2890 struct iwl_lq_sta *lq_sta = file->private_data;
2892 buff = kmalloc(1024, GFP_KERNEL);
2896 for (i = 0; i < LQ_SIZE; i++) {
2897 desc += sprintf(buff+desc,
2898 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
2900 lq_sta->active_tbl == i ? "*" : "x",
2901 lq_sta->lq_info[i].lq_type,
2902 lq_sta->lq_info[i].is_SGI,
2903 lq_sta->lq_info[i].is_ht40,
2904 lq_sta->lq_info[i].is_dup,
2906 lq_sta->lq_info[i].current_rate);
2907 for (j = 0; j < IWL_RATE_COUNT; j++) {
2908 desc += sprintf(buff+desc,
2909 "counter=%d success=%d %%=%d\n",
2910 lq_sta->lq_info[i].win[j].counter,
2911 lq_sta->lq_info[i].win[j].success_counter,
2912 lq_sta->lq_info[i].win[j].success_ratio);
2915 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2920 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2921 .read = rs_sta_dbgfs_stats_table_read,
2922 .open = open_file_generic,
2925 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
2926 char __user *user_buf, size_t count, loff_t *ppos)
2932 struct iwl_lq_sta *lq_sta = file->private_data;
2933 struct iwl_priv *priv;
2934 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
2938 if (is_Ht(tbl->lq_type))
2939 desc += sprintf(buff+desc,
2940 "Bit Rate= %d Mb/s\n",
2941 tbl->expected_tpt[lq_sta->last_txrate_idx]);
2943 desc += sprintf(buff+desc,
2944 "Bit Rate= %d Mb/s\n",
2945 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
2947 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2951 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
2952 .read = rs_sta_dbgfs_rate_scale_data_read,
2953 .open = open_file_generic,
2956 static void rs_add_debugfs(void *priv, void *priv_sta,
2959 struct iwl_lq_sta *lq_sta = priv_sta;
2960 lq_sta->rs_sta_dbgfs_scale_table_file =
2961 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2962 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2963 lq_sta->rs_sta_dbgfs_stats_table_file =
2964 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2965 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2966 lq_sta->rs_sta_dbgfs_rate_scale_data_file =
2967 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
2968 lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
2969 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2970 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2971 &lq_sta->tx_agg_tid_en);
2975 static void rs_remove_debugfs(void *priv, void *priv_sta)
2977 struct iwl_lq_sta *lq_sta = priv_sta;
2978 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2979 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2980 debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
2981 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2986 * Initialization of rate scaling information is done by driver after
2987 * the station is added. Since mac80211 calls this function before a
2988 * station is added we ignore it.
2990 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
2991 struct ieee80211_sta *sta, void *priv_sta)
2994 static struct rate_control_ops rs_ops = {
2997 .tx_status = rs_tx_status,
2998 .get_rate = rs_get_rate,
2999 .rate_init = rs_rate_init_stub,
3002 .alloc_sta = rs_alloc_sta,
3003 .free_sta = rs_free_sta,
3004 #ifdef CONFIG_MAC80211_DEBUGFS
3005 .add_sta_debugfs = rs_add_debugfs,
3006 .remove_sta_debugfs = rs_remove_debugfs,
3010 int iwlagn_rate_control_register(void)
3012 return ieee80211_rate_control_register(&rs_ops);
3015 void iwlagn_rate_control_unregister(void)
3017 ieee80211_rate_control_unregister(&rs_ops);