1 /******************************************************************************
3 * Copyright(c) 2005 - 2008 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 * James P. Ketrenos <ipw2100-admin@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>
41 #include "iwl-helpers.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 time to accum history 2 seconds */
54 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
56 static u8 rs_ht_to_legacy[] = {
57 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
61 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
62 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
63 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
66 static const u8 ant_toggle_lookup[] = {
67 /*ANT_NONE -> */ ANT_NONE,
70 /*ANT_AB -> */ ANT_BC,
72 /*ANT_AC -> */ ANT_AB,
73 /*ANT_BC -> */ ANT_AC,
74 /*ANT_ABC -> */ ANT_ABC,
78 * struct iwl_rate_scale_data -- tx success history for one rate
80 struct iwl_rate_scale_data {
81 u64 data; /* bitmap of successful frames */
82 s32 success_counter; /* number of frames successful */
83 s32 success_ratio; /* per-cent * 128 */
84 s32 counter; /* number of frames attempted */
85 s32 average_tpt; /* success ratio * expected throughput */
90 * struct iwl_scale_tbl_info -- tx params and success history for all rates
92 * There are two of these in struct iwl_lq_sta,
93 * one for "active", and one for "search".
95 struct iwl_scale_tbl_info {
96 enum iwl_table_type lq_type;
98 u8 is_SGI; /* 1 = short guard interval */
99 u8 is_fat; /* 1 = 40 MHz channel width */
100 u8 is_dup; /* 1 = duplicated data streams */
101 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
102 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
103 u32 current_rate; /* rate_n_flags, uCode API format */
104 struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
107 struct iwl_traffic_load {
108 unsigned long time_stamp; /* age of the oldest statistics */
109 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
111 u32 total; /* total num of packets during the
112 * last TID_MAX_TIME_DIFF */
113 u8 queue_count; /* number of queues that has
114 * been used since the last cleanup */
115 u8 head; /* start of the circular buffer */
119 * struct iwl_lq_sta -- driver's rate scaling private structure
121 * Pointer to this gets passed back and forth between driver and mac80211.
124 u8 active_tbl; /* index of active table, range 0-1 */
125 u8 enable_counter; /* indicates HT mode */
126 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
127 u8 search_better_tbl; /* 1: currently trying alternate mode */
130 /* The following determine when to search for a new mode */
131 u32 table_count_limit;
132 u32 max_failure_limit; /* # failed frames before new search */
133 u32 max_success_limit; /* # successful frames before new search */
135 u32 total_failed; /* total failed frames, any/all rates */
136 u32 total_success; /* total successful frames, any/all rates */
137 u32 flush_timer; /* time staying in mode before new search */
139 u8 action_counter; /* # mode-switch actions tried */
142 enum ieee80211_band band;
145 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
147 u16 active_legacy_rate;
148 u16 active_siso_rate;
149 u16 active_mimo2_rate;
150 u16 active_mimo3_rate;
151 u16 active_rate_basic;
153 struct iwl_link_quality_cmd lq;
154 struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
155 struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
157 #ifdef CONFIG_MAC80211_DEBUGFS
158 struct dentry *rs_sta_dbgfs_scale_table_file;
159 struct dentry *rs_sta_dbgfs_stats_table_file;
160 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
163 struct iwl_priv *drv;
165 /* used to be in sta_info */
169 static void rs_rate_scale_perform(struct iwl_priv *priv,
170 struct ieee80211_hdr *hdr,
171 struct ieee80211_sta *sta,
172 struct iwl_lq_sta *lq_sta);
173 static void rs_fill_link_cmd(const struct iwl_priv *priv,
174 struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
177 #ifdef CONFIG_MAC80211_DEBUGFS
178 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
179 u32 *rate_n_flags, int index);
181 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
182 u32 *rate_n_flags, int index)
187 * Expected throughput metrics for following rates:
188 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
189 * "G" is the only table that supports CCK (the first 4 rates).
191 /*FIXME:RS:need to separate tables for MIMO2/MIMO3*/
192 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
193 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
196 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
197 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
200 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
201 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
204 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
205 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
208 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
209 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
212 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
213 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
216 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
217 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
220 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
221 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
224 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
225 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
228 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
229 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
232 static inline u8 rs_extract_rate(u32 rate_n_flags)
234 return (u8)(rate_n_flags & 0xFF);
237 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
240 window->success_counter = 0;
241 window->success_ratio = IWL_INVALID_VALUE;
243 window->average_tpt = IWL_INVALID_VALUE;
247 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
249 return (ant_type & valid_antenna) == ant_type;
253 * removes the old data from the statistics. All data that is older than
254 * TID_MAX_TIME_DIFF, will be deleted.
256 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
258 /* The oldest age we want to keep */
259 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
261 while (tl->queue_count &&
262 (tl->time_stamp < oldest_time)) {
263 tl->total -= tl->packet_count[tl->head];
264 tl->packet_count[tl->head] = 0;
265 tl->time_stamp += TID_QUEUE_CELL_SPACING;
268 if (tl->head >= TID_QUEUE_MAX_SIZE)
274 * increment traffic load value for tid and also remove
275 * any old values if passed the certain time period
277 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
278 struct ieee80211_hdr *hdr)
280 u32 curr_time = jiffies_to_msecs(jiffies);
283 struct iwl_traffic_load *tl = NULL;
284 __le16 fc = hdr->frame_control;
287 if (ieee80211_is_data_qos(fc)) {
288 u8 *qc = ieee80211_get_qos_ctl(hdr);
291 return MAX_TID_COUNT;
293 tl = &lq_data->load[tid];
295 curr_time -= curr_time % TID_ROUND_VALUE;
297 /* Happens only for the first packet. Initialize the data */
298 if (!(tl->queue_count)) {
300 tl->time_stamp = curr_time;
303 tl->packet_count[0] = 1;
304 return MAX_TID_COUNT;
307 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
308 index = time_diff / TID_QUEUE_CELL_SPACING;
310 /* The history is too long: remove data that is older than */
311 /* TID_MAX_TIME_DIFF */
312 if (index >= TID_QUEUE_MAX_SIZE)
313 rs_tl_rm_old_stats(tl, curr_time);
315 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
316 tl->packet_count[index] = tl->packet_count[index] + 1;
317 tl->total = tl->total + 1;
319 if ((index + 1) > tl->queue_count)
320 tl->queue_count = index + 1;
326 get the traffic load value for tid
328 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
330 u32 curr_time = jiffies_to_msecs(jiffies);
333 struct iwl_traffic_load *tl = NULL;
335 if (tid >= TID_MAX_LOAD_COUNT)
338 tl = &(lq_data->load[tid]);
340 curr_time -= curr_time % TID_ROUND_VALUE;
342 if (!(tl->queue_count))
345 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
346 index = time_diff / TID_QUEUE_CELL_SPACING;
348 /* The history is too long: remove data that is older than */
349 /* TID_MAX_TIME_DIFF */
350 if (index >= TID_QUEUE_MAX_SIZE)
351 rs_tl_rm_old_stats(tl, curr_time);
356 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
357 struct iwl_lq_sta *lq_data, u8 tid,
358 struct ieee80211_sta *sta)
360 if (rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
361 IWL_DEBUG_HT("Starting Tx agg: STA: %pM tid: %d\n",
363 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
367 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
368 struct iwl_lq_sta *lq_data,
369 struct ieee80211_sta *sta)
371 if ((tid < TID_MAX_LOAD_COUNT))
372 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
373 else if (tid == IWL_AGG_ALL_TID)
374 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
375 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
378 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
380 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
381 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
382 !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
386 * rs_collect_tx_data - Update the success/failure sliding window
388 * We keep a sliding window of the last 62 packets transmitted
389 * at this rate. window->data contains the bitmask of successful
392 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
393 int scale_index, s32 tpt, int retries,
396 struct iwl_rate_scale_data *window = NULL;
397 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
400 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
403 /* Select data for current tx bit rate */
404 window = &(windows[scale_index]);
407 * Keep track of only the latest 62 tx frame attempts in this rate's
408 * history window; anything older isn't really relevant any more.
409 * If we have filled up the sliding window, drop the oldest attempt;
410 * if the oldest attempt (highest bit in bitmap) shows "success",
411 * subtract "1" from the success counter (this is the main reason
412 * we keep these bitmaps!).
414 while (retries > 0) {
415 if (window->counter >= IWL_RATE_MAX_WINDOW) {
417 /* remove earliest */
418 window->counter = IWL_RATE_MAX_WINDOW - 1;
420 if (window->data & mask) {
421 window->data &= ~mask;
422 window->success_counter--;
426 /* Increment frames-attempted counter */
429 /* Shift bitmap by one frame (throw away oldest history),
430 * OR in "1", and increment "success" if this
431 * frame was successful. */
434 window->success_counter++;
442 /* Calculate current success ratio, avoid divide-by-0! */
443 if (window->counter > 0)
444 window->success_ratio = 128 * (100 * window->success_counter)
447 window->success_ratio = IWL_INVALID_VALUE;
449 fail_count = window->counter - window->success_counter;
451 /* Calculate average throughput, if we have enough history. */
452 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
453 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
454 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
456 window->average_tpt = IWL_INVALID_VALUE;
458 /* Tag this window as having been updated */
459 window->stamp = jiffies;
465 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
467 /* FIXME:RS:remove this function and put the flags statically in the table */
468 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
469 int index, u8 use_green)
471 u32 rate_n_flags = 0;
473 if (is_legacy(tbl->lq_type)) {
474 rate_n_flags = iwl_rates[index].plcp;
475 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
476 rate_n_flags |= RATE_MCS_CCK_MSK;
478 } else if (is_Ht(tbl->lq_type)) {
479 if (index > IWL_LAST_OFDM_RATE) {
480 IWL_ERROR("invalid HT rate index %d\n", index);
481 index = IWL_LAST_OFDM_RATE;
483 rate_n_flags = RATE_MCS_HT_MSK;
485 if (is_siso(tbl->lq_type))
486 rate_n_flags |= iwl_rates[index].plcp_siso;
487 else if (is_mimo2(tbl->lq_type))
488 rate_n_flags |= iwl_rates[index].plcp_mimo2;
490 rate_n_flags |= iwl_rates[index].plcp_mimo3;
492 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
495 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
496 RATE_MCS_ANT_ABC_MSK);
498 if (is_Ht(tbl->lq_type)) {
501 rate_n_flags |= RATE_MCS_DUP_MSK;
503 rate_n_flags |= RATE_MCS_FAT_MSK;
506 rate_n_flags |= RATE_MCS_SGI_MSK;
509 rate_n_flags |= RATE_MCS_GF_MSK;
510 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
511 rate_n_flags &= ~RATE_MCS_SGI_MSK;
512 IWL_ERROR("GF was set with SGI:SISO\n");
520 * Interpret uCode API's rate_n_flags format,
521 * fill "search" or "active" tx mode table.
523 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
524 enum ieee80211_band band,
525 struct iwl_scale_tbl_info *tbl,
528 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
529 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
532 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
534 if (*rate_idx == IWL_RATE_INVALID) {
538 tbl->is_SGI = 0; /* default legacy setup */
541 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
542 tbl->lq_type = LQ_NONE;
544 /* legacy rate format */
545 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
546 if (num_of_ant == 1) {
547 if (band == IEEE80211_BAND_5GHZ)
554 if (rate_n_flags & RATE_MCS_SGI_MSK)
557 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
558 (rate_n_flags & RATE_MCS_DUP_MSK))
561 if (rate_n_flags & RATE_MCS_DUP_MSK)
564 mcs = rs_extract_rate(rate_n_flags);
567 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
569 tbl->lq_type = LQ_SISO; /*else NONE*/
571 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
573 tbl->lq_type = LQ_MIMO2;
577 tbl->lq_type = LQ_MIMO3;
583 /* switch to another antenna/antennas and return 1 */
584 /* if no other valid antenna found, return 0 */
585 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
586 struct iwl_scale_tbl_info *tbl)
590 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
593 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
596 new_ant_type = ant_toggle_lookup[tbl->ant_type];
598 while ((new_ant_type != tbl->ant_type) &&
599 !rs_is_valid_ant(valid_ant, new_ant_type))
600 new_ant_type = ant_toggle_lookup[new_ant_type];
602 if (new_ant_type == tbl->ant_type)
605 tbl->ant_type = new_ant_type;
606 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
607 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
611 /* FIXME:RS: in 4965 we don't use greenfield at all */
612 /* FIXME:RS: don't use greenfield for now in TX */
614 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
616 return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
617 priv->current_ht_config.is_green_field &&
618 !priv->current_ht_config.non_GF_STA_present;
621 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
627 * rs_get_supported_rates - get the available rates
629 * if management frame or broadcast frame only return
630 * basic available rates.
633 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
634 struct ieee80211_hdr *hdr,
635 enum iwl_table_type rate_type)
637 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
638 lq_sta->active_rate_basic)
639 return lq_sta->active_rate_basic;
641 if (is_legacy(rate_type)) {
642 return lq_sta->active_legacy_rate;
644 if (is_siso(rate_type))
645 return lq_sta->active_siso_rate;
646 else if (is_mimo2(rate_type))
647 return lq_sta->active_mimo2_rate;
649 return lq_sta->active_mimo3_rate;
653 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
656 u8 high = IWL_RATE_INVALID;
657 u8 low = IWL_RATE_INVALID;
659 /* 802.11A or ht walks to the next literal adjacent rate in
661 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
665 /* Find the previous rate that is in the rate mask */
667 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
668 if (rate_mask & mask) {
674 /* Find the next rate that is in the rate mask */
676 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
677 if (rate_mask & mask) {
683 return (high << 8) | low;
687 while (low != IWL_RATE_INVALID) {
688 low = iwl_rates[low].prev_rs;
689 if (low == IWL_RATE_INVALID)
691 if (rate_mask & (1 << low))
693 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
697 while (high != IWL_RATE_INVALID) {
698 high = iwl_rates[high].next_rs;
699 if (high == IWL_RATE_INVALID)
701 if (rate_mask & (1 << high))
703 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
706 return (high << 8) | low;
709 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
710 struct iwl_scale_tbl_info *tbl,
711 u8 scale_index, u8 ht_possible)
716 u8 switch_to_legacy = 0;
717 u8 is_green = lq_sta->is_green;
719 /* check if we need to switch from HT to legacy rates.
720 * assumption is that mandatory rates (1Mbps or 6Mbps)
721 * are always supported (spec demand) */
722 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
723 switch_to_legacy = 1;
724 scale_index = rs_ht_to_legacy[scale_index];
725 if (lq_sta->band == IEEE80211_BAND_5GHZ)
730 if (num_of_ant(tbl->ant_type) > 1)
731 tbl->ant_type = ANT_A;/*FIXME:RS*/
737 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
739 /* Mask with station rate restriction */
740 if (is_legacy(tbl->lq_type)) {
741 /* supp_rates has no CCK bits in A mode */
742 if (lq_sta->band == IEEE80211_BAND_5GHZ)
743 rate_mask = (u16)(rate_mask &
744 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
746 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
749 /* If we switched from HT to legacy, check current rate */
750 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
755 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
757 low = high_low & 0xff;
759 if (low == IWL_RATE_INVALID)
763 return rate_n_flags_from_tbl(tbl, low, is_green);
767 * mac80211 sends us Tx status
769 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
770 struct ieee80211_sta *sta, void *priv_sta,
775 int rs_index, index = 0;
776 struct iwl_lq_sta *lq_sta;
777 struct iwl_link_quality_cmd *table;
778 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
779 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
780 struct ieee80211_hw *hw = priv->hw;
781 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
782 struct iwl_rate_scale_data *window = NULL;
783 struct iwl_rate_scale_data *search_win = NULL;
785 struct iwl_scale_tbl_info tbl_type;
786 struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
788 __le16 fc = hdr->frame_control;
791 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
793 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
796 /* This packet was aggregated but doesn't carry rate scale info */
797 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
798 !(info->flags & IEEE80211_TX_STAT_AMPDU))
801 retries = info->status.rates[0].count - 1;
806 lq_sta = (struct iwl_lq_sta *)priv_sta;
808 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
809 !lq_sta->ibss_sta_added)
813 active_index = lq_sta->active_tbl;
815 curr_tbl = &(lq_sta->lq_info[active_index]);
816 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
817 window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
818 search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
821 * Ignore this Tx frame response if its initial rate doesn't match
822 * that of latest Link Quality command. There may be stragglers
823 * from a previous Link Quality command, but we're no longer interested
824 * in those; they're either from the "active" mode while we're trying
825 * to check "search" mode, or a prior "search" mode after we've moved
826 * to a new "search" mode (which might become the new "active" mode).
828 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
829 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
830 if (priv->band == IEEE80211_BAND_5GHZ)
831 rs_index -= IWL_FIRST_OFDM_RATE;
833 if ((info->status.rates[0].idx < 0) ||
834 (tbl_type.is_SGI != !!(info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) ||
835 (tbl_type.is_fat != !!(info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
836 (tbl_type.is_dup != !!(info->status.rates[0].flags & IEEE80211_TX_RC_DUP_DATA)) ||
837 (tbl_type.ant_type != info->antenna_sel_tx) ||
838 (!!(tx_rate & RATE_MCS_HT_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) ||
839 (!!(tx_rate & RATE_MCS_GF_MSK) != !!(info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
840 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
841 hw->wiphy->bands[info->band]->bitrates[info->status.rates[0].idx].bitrate)) {
842 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
846 /* Update frame history window with "failure" for each Tx retry. */
848 /* Look up the rate and other info used for each tx attempt.
849 * Each tx attempt steps one entry deeper in the rate table. */
850 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
851 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
852 &tbl_type, &rs_index);
854 /* If type matches "search" table,
855 * add failure to "search" history */
856 if ((tbl_type.lq_type == search_tbl->lq_type) &&
857 (tbl_type.ant_type == search_tbl->ant_type) &&
858 (tbl_type.is_SGI == search_tbl->is_SGI)) {
859 if (search_tbl->expected_tpt)
860 tpt = search_tbl->expected_tpt[rs_index];
863 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
865 /* Else if type matches "current/active" table,
866 * add failure to "current/active" history */
867 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
868 (tbl_type.ant_type == curr_tbl->ant_type) &&
869 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
870 if (curr_tbl->expected_tpt)
871 tpt = curr_tbl->expected_tpt[rs_index];
874 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
877 /* If not searching for a new mode, increment failed counter
878 * ... this helps determine when to start searching again */
879 if (lq_sta->stay_in_tbl)
880 lq_sta->total_failed++;
887 * Find (by rate) the history window to update with final Tx attempt;
888 * if Tx was successful first try, use original rate,
889 * else look up the rate that was, finally, successful.
891 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
892 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
894 /* Update frame history window with "success" if Tx got ACKed ... */
895 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
897 /* If type matches "search" table,
898 * add final tx status to "search" history */
899 if ((tbl_type.lq_type == search_tbl->lq_type) &&
900 (tbl_type.ant_type == search_tbl->ant_type) &&
901 (tbl_type.is_SGI == search_tbl->is_SGI)) {
902 if (search_tbl->expected_tpt)
903 tpt = search_tbl->expected_tpt[rs_index];
906 if (info->flags & IEEE80211_TX_CTL_AMPDU)
907 rs_collect_tx_data(search_win, rs_index, tpt,
908 info->status.ampdu_ack_len,
909 info->status.ampdu_ack_map);
911 rs_collect_tx_data(search_win, rs_index, tpt,
913 /* Else if type matches "current/active" table,
914 * add final tx status to "current/active" history */
915 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
916 (tbl_type.ant_type == curr_tbl->ant_type) &&
917 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
918 if (curr_tbl->expected_tpt)
919 tpt = curr_tbl->expected_tpt[rs_index];
922 if (info->flags & IEEE80211_TX_CTL_AMPDU)
923 rs_collect_tx_data(window, rs_index, tpt,
924 info->status.ampdu_ack_len,
925 info->status.ampdu_ack_map);
927 rs_collect_tx_data(window, rs_index, tpt,
931 /* If not searching for new mode, increment success/failed counter
932 * ... these help determine when to start searching again */
933 if (lq_sta->stay_in_tbl) {
934 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
935 lq_sta->total_success += info->status.ampdu_ack_map;
936 lq_sta->total_failed +=
937 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
940 lq_sta->total_success++;
942 lq_sta->total_failed++;
946 /* See if there's a better rate or modulation mode to try. */
947 rs_rate_scale_perform(priv, hdr, sta, lq_sta);
953 * Begin a period of staying with a selected modulation mode.
954 * Set "stay_in_tbl" flag to prevent any mode switches.
955 * Set frame tx success limits according to legacy vs. high-throughput,
956 * and reset overall (spanning all rates) tx success history statistics.
957 * These control how long we stay using same modulation mode before
958 * searching for a new mode.
960 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
961 struct iwl_lq_sta *lq_sta)
963 IWL_DEBUG_RATE("we are staying in the same table\n");
964 lq_sta->stay_in_tbl = 1; /* only place this gets set */
966 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
967 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
968 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
970 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
971 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
972 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
974 lq_sta->table_count = 0;
975 lq_sta->total_failed = 0;
976 lq_sta->total_success = 0;
980 * Find correct throughput table for given mode of modulation
982 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
983 struct iwl_scale_tbl_info *tbl)
985 if (is_legacy(tbl->lq_type)) {
986 if (!is_a_band(tbl->lq_type))
987 tbl->expected_tpt = expected_tpt_G;
989 tbl->expected_tpt = expected_tpt_A;
990 } else if (is_siso(tbl->lq_type)) {
991 if (tbl->is_fat && !lq_sta->is_dup)
993 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
995 tbl->expected_tpt = expected_tpt_siso40MHz;
996 else if (tbl->is_SGI)
997 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
999 tbl->expected_tpt = expected_tpt_siso20MHz;
1001 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1002 if (tbl->is_fat && !lq_sta->is_dup)
1004 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1006 tbl->expected_tpt = expected_tpt_mimo40MHz;
1007 else if (tbl->is_SGI)
1008 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1010 tbl->expected_tpt = expected_tpt_mimo20MHz;
1012 tbl->expected_tpt = expected_tpt_G;
1016 * Find starting rate for new "search" high-throughput mode of modulation.
1017 * Goal is to find lowest expected rate (under perfect conditions) that is
1018 * above the current measured throughput of "active" mode, to give new mode
1019 * a fair chance to prove itself without too many challenges.
1021 * This gets called when transitioning to more aggressive modulation
1022 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1023 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1024 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1025 * bit rate will typically need to increase, but not if performance was bad.
1027 static s32 rs_get_best_rate(struct iwl_priv *priv,
1028 struct iwl_lq_sta *lq_sta,
1029 struct iwl_scale_tbl_info *tbl, /* "search" */
1030 u16 rate_mask, s8 index)
1032 /* "active" values */
1033 struct iwl_scale_tbl_info *active_tbl =
1034 &(lq_sta->lq_info[lq_sta->active_tbl]);
1035 s32 active_sr = active_tbl->win[index].success_ratio;
1036 s32 active_tpt = active_tbl->expected_tpt[index];
1038 /* expected "search" throughput */
1039 s32 *tpt_tbl = tbl->expected_tpt;
1041 s32 new_rate, high, low, start_hi;
1045 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1048 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1051 low = high_low & 0xff;
1052 high = (high_low >> 8) & 0xff;
1055 * Lower the "search" bit rate, to give new "search" mode
1056 * approximately the same throughput as "active" if:
1058 * 1) "Active" mode has been working modestly well (but not
1059 * great), and expected "search" throughput (under perfect
1060 * conditions) at candidate rate is above the actual
1061 * measured "active" throughput (but less than expected
1062 * "active" throughput under perfect conditions).
1064 * 2) "Active" mode has been working perfectly or very well
1065 * and expected "search" throughput (under perfect
1066 * conditions) at candidate rate is above expected
1067 * "active" throughput (under perfect conditions).
1069 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1070 ((active_sr > IWL_RATE_DECREASE_TH) &&
1071 (active_sr <= IWL_RATE_HIGH_TH) &&
1072 (tpt_tbl[rate] <= active_tpt))) ||
1073 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1074 (tpt_tbl[rate] > active_tpt))) {
1076 /* (2nd or later pass)
1077 * If we've already tried to raise the rate, and are
1078 * now trying to lower it, use the higher rate. */
1079 if (start_hi != IWL_RATE_INVALID) {
1080 new_rate = start_hi;
1086 /* Loop again with lower rate */
1087 if (low != IWL_RATE_INVALID)
1090 /* Lower rate not available, use the original */
1094 /* Else try to raise the "search" rate to match "active" */
1096 /* (2nd or later pass)
1097 * If we've already tried to lower the rate, and are
1098 * now trying to raise it, use the lower rate. */
1099 if (new_rate != IWL_RATE_INVALID)
1102 /* Loop again with higher rate */
1103 else if (high != IWL_RATE_INVALID) {
1107 /* Higher rate not available, use the original */
1119 * Set up search table for MIMO
1121 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1122 struct iwl_lq_sta *lq_sta,
1123 struct ieee80211_conf *conf,
1124 struct ieee80211_sta *sta,
1125 struct iwl_scale_tbl_info *tbl, int index)
1129 s8 is_green = lq_sta->is_green;
1131 if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1134 if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1135 == WLAN_HT_CAP_SM_PS_STATIC)
1138 /* Need both Tx chains/antennas to support MIMO */
1139 if (priv->hw_params.tx_chains_num < 2)
1142 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1144 tbl->lq_type = LQ_MIMO2;
1145 tbl->is_dup = lq_sta->is_dup;
1147 rate_mask = lq_sta->active_mimo2_rate;
1149 if (priv->current_ht_config.supported_chan_width
1150 == IWL_CHANNEL_WIDTH_40MHZ)
1155 /* FIXME: - don't toggle SGI here
1157 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1161 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1167 rs_set_expected_tpt_table(lq_sta, tbl);
1169 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1171 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1173 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1174 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1178 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1180 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1181 tbl->current_rate, is_green);
1186 * Set up search table for SISO
1188 static int rs_switch_to_siso(struct iwl_priv *priv,
1189 struct iwl_lq_sta *lq_sta,
1190 struct ieee80211_conf *conf,
1191 struct ieee80211_sta *sta,
1192 struct iwl_scale_tbl_info *tbl, int index)
1195 u8 is_green = lq_sta->is_green;
1198 if (!conf->ht.enabled || !sta->ht_cap.ht_supported)
1201 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1203 tbl->is_dup = lq_sta->is_dup;
1204 tbl->lq_type = LQ_SISO;
1206 rate_mask = lq_sta->active_siso_rate;
1208 if (priv->current_ht_config.supported_chan_width
1209 == IWL_CHANNEL_WIDTH_40MHZ)
1214 /* FIXME: - don't toggle SGI here
1216 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1220 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1227 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1229 rs_set_expected_tpt_table(lq_sta, tbl);
1230 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1232 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1233 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1234 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1238 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1239 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1240 tbl->current_rate, is_green);
1245 * Try to switch to new modulation mode from legacy
1247 static int rs_move_legacy_other(struct iwl_priv *priv,
1248 struct iwl_lq_sta *lq_sta,
1249 struct ieee80211_conf *conf,
1250 struct ieee80211_sta *sta,
1253 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1254 struct iwl_scale_tbl_info *search_tbl =
1255 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1256 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1257 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1258 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1259 u8 start_action = tbl->action;
1260 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1261 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1265 switch (tbl->action) {
1266 case IWL_LEGACY_SWITCH_ANTENNA1:
1267 case IWL_LEGACY_SWITCH_ANTENNA2:
1268 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1270 lq_sta->action_counter++;
1272 if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1273 tx_chains_num <= 1) ||
1274 (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1275 tx_chains_num <= 2))
1278 /* Don't change antenna if success has been great */
1279 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1282 /* Set up search table to try other antenna */
1283 memcpy(search_tbl, tbl, sz);
1285 if (rs_toggle_antenna(valid_tx_ant,
1286 &search_tbl->current_rate, search_tbl)) {
1287 rs_set_expected_tpt_table(lq_sta, search_tbl);
1291 case IWL_LEGACY_SWITCH_SISO:
1292 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1294 /* Set up search table to try SISO */
1295 memcpy(search_tbl, tbl, sz);
1296 search_tbl->is_SGI = 0;
1297 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1300 lq_sta->action_counter = 0;
1305 case IWL_LEGACY_SWITCH_MIMO2_AB:
1306 case IWL_LEGACY_SWITCH_MIMO2_AC:
1307 case IWL_LEGACY_SWITCH_MIMO2_BC:
1308 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1310 /* Set up search table to try MIMO */
1311 memcpy(search_tbl, tbl, sz);
1312 search_tbl->is_SGI = 0;
1314 if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1315 search_tbl->ant_type = ANT_AB;
1316 else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1317 search_tbl->ant_type = ANT_AC;
1319 search_tbl->ant_type = ANT_BC;
1321 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1324 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1327 lq_sta->action_counter = 0;
1333 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1334 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1336 if (tbl->action == start_action)
1340 search_tbl->lq_type = LQ_NONE;
1344 lq_sta->search_better_tbl = 1;
1346 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1347 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1353 * Try to switch to new modulation mode from SISO
1355 static int rs_move_siso_to_other(struct iwl_priv *priv,
1356 struct iwl_lq_sta *lq_sta,
1357 struct ieee80211_conf *conf,
1358 struct ieee80211_sta *sta, int index)
1360 u8 is_green = lq_sta->is_green;
1361 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1362 struct iwl_scale_tbl_info *search_tbl =
1363 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1364 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1365 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1366 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1367 u8 start_action = tbl->action;
1368 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1369 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1373 lq_sta->action_counter++;
1374 switch (tbl->action) {
1375 case IWL_SISO_SWITCH_ANTENNA1:
1376 case IWL_SISO_SWITCH_ANTENNA2:
1377 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1379 if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1380 tx_chains_num <= 1) ||
1381 (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1382 tx_chains_num <= 2))
1385 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1388 memcpy(search_tbl, tbl, sz);
1389 if (rs_toggle_antenna(valid_tx_ant,
1390 &search_tbl->current_rate, search_tbl))
1393 case IWL_SISO_SWITCH_MIMO2_AB:
1394 case IWL_SISO_SWITCH_MIMO2_AC:
1395 case IWL_SISO_SWITCH_MIMO2_BC:
1396 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1397 memcpy(search_tbl, tbl, sz);
1398 search_tbl->is_SGI = 0;
1400 if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1401 search_tbl->ant_type = ANT_AB;
1402 else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1403 search_tbl->ant_type = ANT_AC;
1405 search_tbl->ant_type = ANT_BC;
1407 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1410 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1415 case IWL_SISO_SWITCH_GI:
1417 !(priv->current_ht_config.sgf &
1421 !(priv->current_ht_config.sgf &
1425 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1427 memcpy(search_tbl, tbl, sz);
1432 IWL_ERROR("SGI was set in GF+SISO\n");
1434 search_tbl->is_SGI = !tbl->is_SGI;
1435 rs_set_expected_tpt_table(lq_sta, search_tbl);
1437 s32 tpt = lq_sta->last_tpt / 100;
1438 if (tpt >= search_tbl->expected_tpt[index])
1441 search_tbl->current_rate = rate_n_flags_from_tbl(
1442 search_tbl, index, is_green);
1446 if (tbl->action > IWL_SISO_SWITCH_GI)
1447 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1449 if (tbl->action == start_action)
1452 search_tbl->lq_type = LQ_NONE;
1456 lq_sta->search_better_tbl = 1;
1458 if (tbl->action > IWL_SISO_SWITCH_GI)
1459 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1464 * Try to switch to new modulation mode from MIMO
1466 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1467 struct iwl_lq_sta *lq_sta,
1468 struct ieee80211_conf *conf,
1469 struct ieee80211_sta *sta, int index)
1471 s8 is_green = lq_sta->is_green;
1472 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1473 struct iwl_scale_tbl_info *search_tbl =
1474 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1475 struct iwl_rate_scale_data *window = &(tbl->win[index]);
1476 u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1477 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1478 u8 start_action = tbl->action;
1479 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1480 u8 tx_chains_num = priv->hw_params.tx_chains_num;
1484 lq_sta->action_counter++;
1485 switch (tbl->action) {
1486 case IWL_MIMO2_SWITCH_ANTENNA1:
1487 case IWL_MIMO2_SWITCH_ANTENNA2:
1488 IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1490 if (tx_chains_num <= 2)
1493 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1496 memcpy(search_tbl, tbl, sz);
1497 if (rs_toggle_antenna(valid_tx_ant,
1498 &search_tbl->current_rate, search_tbl))
1501 case IWL_MIMO2_SWITCH_SISO_A:
1502 case IWL_MIMO2_SWITCH_SISO_B:
1503 case IWL_MIMO2_SWITCH_SISO_C:
1504 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1506 /* Set up new search table for SISO */
1507 memcpy(search_tbl, tbl, sz);
1509 if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1510 search_tbl->ant_type = ANT_A;
1511 else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1512 search_tbl->ant_type = ANT_B;
1514 search_tbl->ant_type = ANT_C;
1516 if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1519 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1526 case IWL_MIMO2_SWITCH_GI:
1528 !(priv->current_ht_config.sgf &
1532 !(priv->current_ht_config.sgf &
1536 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1538 /* Set up new search table for MIMO */
1539 memcpy(search_tbl, tbl, sz);
1540 search_tbl->is_SGI = !tbl->is_SGI;
1541 rs_set_expected_tpt_table(lq_sta, search_tbl);
1543 * If active table already uses the fastest possible
1544 * modulation (dual stream with short guard interval),
1545 * and it's working well, there's no need to look
1546 * for a better type of modulation!
1549 s32 tpt = lq_sta->last_tpt / 100;
1550 if (tpt >= search_tbl->expected_tpt[index])
1553 search_tbl->current_rate = rate_n_flags_from_tbl(
1554 search_tbl, index, is_green);
1559 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1560 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1562 if (tbl->action == start_action)
1565 search_tbl->lq_type = LQ_NONE;
1568 lq_sta->search_better_tbl = 1;
1570 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1571 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1577 * Check whether we should continue using same modulation mode, or
1578 * begin search for a new mode, based on:
1579 * 1) # tx successes or failures while using this mode
1580 * 2) # times calling this function
1581 * 3) elapsed time in this mode (not used, for now)
1583 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1585 struct iwl_scale_tbl_info *tbl;
1588 int flush_interval_passed = 0;
1589 struct iwl_priv *priv;
1592 active_tbl = lq_sta->active_tbl;
1594 tbl = &(lq_sta->lq_info[active_tbl]);
1596 /* If we've been disallowing search, see if we should now allow it */
1597 if (lq_sta->stay_in_tbl) {
1599 /* Elapsed time using current modulation mode */
1600 if (lq_sta->flush_timer)
1601 flush_interval_passed =
1603 (unsigned long)(lq_sta->flush_timer +
1604 IWL_RATE_SCALE_FLUSH_INTVL));
1607 * Check if we should allow search for new modulation mode.
1608 * If many frames have failed or succeeded, or we've used
1609 * this same modulation for a long time, allow search, and
1610 * reset history stats that keep track of whether we should
1611 * allow a new search. Also (below) reset all bitmaps and
1612 * stats in active history.
1614 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1615 (lq_sta->total_success > lq_sta->max_success_limit) ||
1616 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1617 && (flush_interval_passed))) {
1618 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1619 lq_sta->total_failed,
1620 lq_sta->total_success,
1621 flush_interval_passed);
1623 /* Allow search for new mode */
1624 lq_sta->stay_in_tbl = 0; /* only place reset */
1625 lq_sta->total_failed = 0;
1626 lq_sta->total_success = 0;
1627 lq_sta->flush_timer = 0;
1630 * Else if we've used this modulation mode enough repetitions
1631 * (regardless of elapsed time or success/failure), reset
1632 * history bitmaps and rate-specific stats for all rates in
1636 lq_sta->table_count++;
1637 if (lq_sta->table_count >=
1638 lq_sta->table_count_limit) {
1639 lq_sta->table_count = 0;
1641 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1642 for (i = 0; i < IWL_RATE_COUNT; i++)
1643 rs_rate_scale_clear_window(
1648 /* If transitioning to allow "search", reset all history
1649 * bitmaps and stats in active table (this will become the new
1650 * "search" table). */
1651 if (!lq_sta->stay_in_tbl) {
1652 for (i = 0; i < IWL_RATE_COUNT; i++)
1653 rs_rate_scale_clear_window(&(tbl->win[i]));
1659 * Do rate scaling and search for new modulation mode.
1661 static void rs_rate_scale_perform(struct iwl_priv *priv,
1662 struct ieee80211_hdr *hdr,
1663 struct ieee80211_sta *sta,
1664 struct iwl_lq_sta *lq_sta)
1666 struct ieee80211_hw *hw = priv->hw;
1667 struct ieee80211_conf *conf = &hw->conf;
1668 int low = IWL_RATE_INVALID;
1669 int high = IWL_RATE_INVALID;
1672 struct iwl_rate_scale_data *window = NULL;
1673 int current_tpt = IWL_INVALID_VALUE;
1674 int low_tpt = IWL_INVALID_VALUE;
1675 int high_tpt = IWL_INVALID_VALUE;
1677 s8 scale_action = 0;
1681 struct iwl_scale_tbl_info *tbl, *tbl1;
1682 u16 rate_scale_index_msk = 0;
1689 u8 tid = MAX_TID_COUNT;
1691 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1693 fc = hdr->frame_control;
1694 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1695 /* Send management frames and broadcast/multicast data using
1697 /* TODO: this could probably be improved.. */
1701 if (!sta || !lq_sta)
1704 lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1706 tid = rs_tl_add_packet(lq_sta, hdr);
1709 * Select rate-scale / modulation-mode table to work with in
1710 * the rest of this function: "search" if searching for better
1711 * modulation mode, or "active" if doing rate scaling within a mode.
1713 if (!lq_sta->search_better_tbl)
1714 active_tbl = lq_sta->active_tbl;
1716 active_tbl = 1 - lq_sta->active_tbl;
1718 tbl = &(lq_sta->lq_info[active_tbl]);
1719 is_green = lq_sta->is_green;
1721 /* current tx rate */
1722 index = lq_sta->last_txrate_idx;
1724 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1727 /* rates available for this association, and for modulation mode */
1728 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1730 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1732 /* mask with station rate restriction */
1733 if (is_legacy(tbl->lq_type)) {
1734 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1735 /* supp_rates has no CCK bits in A mode */
1736 rate_scale_index_msk = (u16) (rate_mask &
1737 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1739 rate_scale_index_msk = (u16) (rate_mask &
1740 lq_sta->supp_rates);
1743 rate_scale_index_msk = rate_mask;
1745 if (!rate_scale_index_msk)
1746 rate_scale_index_msk = rate_mask;
1748 if (!((1 << index) & rate_scale_index_msk)) {
1749 IWL_ERROR("Current Rate is not valid\n");
1753 /* Get expected throughput table and history window for current rate */
1754 if (!tbl->expected_tpt) {
1755 IWL_ERROR("tbl->expected_tpt is NULL\n");
1759 window = &(tbl->win[index]);
1762 * If there is not enough history to calculate actual average
1763 * throughput, keep analyzing results of more tx frames, without
1764 * changing rate or mode (bypass most of the rest of this function).
1765 * Set up new rate table in uCode only if old rate is not supported
1766 * in current association (use new rate found above).
1768 fail_count = window->counter - window->success_counter;
1769 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1770 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1771 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1773 window->success_counter, window->counter, index);
1775 /* Can't calculate this yet; not enough history */
1776 window->average_tpt = IWL_INVALID_VALUE;
1778 /* Should we stay with this modulation mode,
1779 * or search for a new one? */
1780 rs_stay_in_table(lq_sta);
1785 /* Else we have enough samples; calculate estimate of
1786 * actual average throughput */
1788 BUG_ON(window->average_tpt != ((window->success_ratio *
1789 tbl->expected_tpt[index] + 64) / 128));
1791 /* If we are searching for better modulation mode, check success. */
1792 if (lq_sta->search_better_tbl) {
1794 /* If good success, continue using the "search" mode;
1795 * no need to send new link quality command, since we're
1796 * continuing to use the setup that we've been trying. */
1797 if (window->average_tpt > lq_sta->last_tpt) {
1799 IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1800 "suc=%d cur-tpt=%d old-tpt=%d\n",
1801 window->success_ratio,
1802 window->average_tpt,
1805 if (!is_legacy(tbl->lq_type))
1806 lq_sta->enable_counter = 1;
1808 /* Swap tables; "search" becomes "active" */
1809 lq_sta->active_tbl = active_tbl;
1810 current_tpt = window->average_tpt;
1812 /* Else poor success; go back to mode in "active" table */
1815 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1816 "suc=%d cur-tpt=%d old-tpt=%d\n",
1817 window->success_ratio,
1818 window->average_tpt,
1821 /* Nullify "search" table */
1822 tbl->lq_type = LQ_NONE;
1824 /* Revert to "active" table */
1825 active_tbl = lq_sta->active_tbl;
1826 tbl = &(lq_sta->lq_info[active_tbl]);
1828 /* Revert to "active" rate and throughput info */
1829 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1830 current_tpt = lq_sta->last_tpt;
1832 /* Need to set up a new rate table in uCode */
1836 /* Either way, we've made a decision; modulation mode
1837 * search is done, allow rate adjustment next time. */
1838 lq_sta->search_better_tbl = 0;
1839 done_search = 1; /* Don't switch modes below! */
1843 /* (Else) not in search of better modulation mode, try for better
1844 * starting rate, while staying in this mode. */
1845 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1847 low = high_low & 0xff;
1848 high = (high_low >> 8) & 0xff;
1850 sr = window->success_ratio;
1852 /* Collect measured throughputs for current and adjacent rates */
1853 current_tpt = window->average_tpt;
1854 if (low != IWL_RATE_INVALID)
1855 low_tpt = tbl->win[low].average_tpt;
1856 if (high != IWL_RATE_INVALID)
1857 high_tpt = tbl->win[high].average_tpt;
1861 /* Too many failures, decrease rate */
1862 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1863 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1866 /* No throughput measured yet for adjacent rates; try increase. */
1867 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1868 (high_tpt == IWL_INVALID_VALUE)) {
1870 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1872 else if (low != IWL_RATE_INVALID)
1876 /* Both adjacent throughputs are measured, but neither one has better
1877 * throughput; we're using the best rate, don't change it! */
1878 else if ((low_tpt != IWL_INVALID_VALUE) &&
1879 (high_tpt != IWL_INVALID_VALUE) &&
1880 (low_tpt < current_tpt) &&
1881 (high_tpt < current_tpt))
1884 /* At least one adjacent rate's throughput is measured,
1885 * and may have better performance. */
1887 /* Higher adjacent rate's throughput is measured */
1888 if (high_tpt != IWL_INVALID_VALUE) {
1889 /* Higher rate has better throughput */
1890 if (high_tpt > current_tpt &&
1891 sr >= IWL_RATE_INCREASE_TH) {
1895 ("decrease rate because of high tpt\n");
1899 /* Lower adjacent rate's throughput is measured */
1900 } else if (low_tpt != IWL_INVALID_VALUE) {
1901 /* Lower rate has better throughput */
1902 if (low_tpt > current_tpt) {
1904 ("decrease rate because of low tpt\n");
1906 } else if (sr >= IWL_RATE_INCREASE_TH) {
1912 /* Sanity check; asked for decrease, but success rate or throughput
1913 * has been good at old rate. Don't change it. */
1914 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1915 ((sr > IWL_RATE_HIGH_TH) ||
1916 (current_tpt > (100 * tbl->expected_tpt[low]))))
1919 switch (scale_action) {
1921 /* Decrease starting rate, update uCode's rate table */
1922 if (low != IWL_RATE_INVALID) {
1928 /* Increase starting rate, update uCode's rate table */
1929 if (high != IWL_RATE_INVALID) {
1941 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1942 "high %d type %d\n",
1943 index, scale_action, low, high, tbl->lq_type);
1946 /* Replace uCode's rate table for the destination station. */
1948 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1949 rs_fill_link_cmd(priv, lq_sta, rate);
1950 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1953 /* Should we stay with this modulation mode, or search for a new one? */
1954 rs_stay_in_table(lq_sta);
1957 * Search for new modulation mode if we're:
1958 * 1) Not changing rates right now
1959 * 2) Not just finishing up a search
1960 * 3) Allowing a new search
1962 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1963 /* Save current throughput to compare with "search" throughput*/
1964 lq_sta->last_tpt = current_tpt;
1966 /* Select a new "search" modulation mode to try.
1967 * If one is found, set up the new "search" table. */
1968 if (is_legacy(tbl->lq_type))
1969 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1970 else if (is_siso(tbl->lq_type))
1971 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1973 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1975 /* If new "search" mode was selected, set up in uCode table */
1976 if (lq_sta->search_better_tbl) {
1977 /* Access the "search" table, clear its history. */
1978 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1979 for (i = 0; i < IWL_RATE_COUNT; i++)
1980 rs_rate_scale_clear_window(&(tbl->win[i]));
1982 /* Use new "search" start rate */
1983 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1985 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1986 tbl->current_rate, index);
1987 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1988 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1991 /* If the "active" (non-search) mode was legacy,
1992 * and we've tried switching antennas,
1993 * but we haven't been able to try HT modes (not available),
1994 * stay with best antenna legacy modulation for a while
1995 * before next round of mode comparisons. */
1996 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1997 if (is_legacy(tbl1->lq_type) && !conf->ht.enabled &&
1998 lq_sta->action_counter >= 1) {
1999 lq_sta->action_counter = 0;
2000 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2001 rs_set_stay_in_table(priv, 1, lq_sta);
2004 /* If we're in an HT mode, and all 3 mode switch actions
2005 * have been tried and compared, stay in this best modulation
2006 * mode for a while before next round of mode comparisons. */
2007 if (lq_sta->enable_counter &&
2008 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2009 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2010 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2011 (tid != MAX_TID_COUNT)) {
2012 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2013 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2015 lq_sta->action_counter = 0;
2016 rs_set_stay_in_table(priv, 0, lq_sta);
2020 * Else, don't search for a new modulation mode.
2021 * Put new timestamp in stay-in-modulation-mode flush timer if:
2022 * 1) Not changing rates right now
2023 * 2) Not just finishing up a search
2024 * 3) flush timer is empty
2027 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2028 lq_sta->flush_timer = jiffies;
2032 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2034 lq_sta->last_txrate_idx = i;
2040 static void rs_initialize_lq(struct iwl_priv *priv,
2041 struct ieee80211_conf *conf,
2042 struct ieee80211_sta *sta,
2043 struct iwl_lq_sta *lq_sta)
2045 struct iwl_scale_tbl_info *tbl;
2049 u8 use_green = rs_use_green(priv, conf);
2053 if (!sta || !lq_sta)
2056 i = lq_sta->last_txrate_idx;
2058 if ((lq_sta->lq.sta_id == 0xff) &&
2059 (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2062 valid_tx_ant = priv->hw_params.valid_tx_ant;
2064 if (!lq_sta->search_better_tbl)
2065 active_tbl = lq_sta->active_tbl;
2067 active_tbl = 1 - lq_sta->active_tbl;
2069 tbl = &(lq_sta->lq_info[active_tbl]);
2071 if ((i < 0) || (i >= IWL_RATE_COUNT))
2074 rate = iwl_rates[i].plcp;
2075 tbl->ant_type = first_antenna(valid_tx_ant);
2076 rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2078 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2079 rate |= RATE_MCS_CCK_MSK;
2081 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2082 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2083 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2085 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2086 tbl->current_rate = rate;
2087 rs_set_expected_tpt_table(lq_sta, tbl);
2088 rs_fill_link_cmd(NULL, lq_sta, rate);
2089 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2094 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2095 struct ieee80211_tx_rate_control *txrc)
2099 struct sk_buff *skb = txrc->skb;
2100 struct ieee80211_supported_band *sband = txrc->sband;
2101 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2102 struct ieee80211_conf *conf = &priv->hw->conf;
2103 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2104 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2106 struct iwl_lq_sta *lq_sta;
2108 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2110 /* Send management frames and broadcast/multicast data using lowest
2112 fc = hdr->frame_control;
2113 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2114 !sta || !priv_sta) {
2115 info->control.rates[0].idx = rate_lowest_index(sband, sta);
2119 lq_sta = (struct iwl_lq_sta *)priv_sta;
2120 i = lq_sta->last_txrate_idx;
2122 if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2123 !lq_sta->ibss_sta_added) {
2124 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2126 if (sta_id == IWL_INVALID_STATION) {
2127 IWL_DEBUG_RATE("LQ: ADD station %pM\n",
2129 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2130 0, CMD_ASYNC, NULL);
2132 if ((sta_id != IWL_INVALID_STATION)) {
2133 lq_sta->lq.sta_id = sta_id;
2134 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2135 lq_sta->ibss_sta_added = 1;
2136 rs_initialize_lq(priv, conf, sta, lq_sta);
2140 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2141 info->control.rates[0].idx = rate_lowest_index(sband, sta);
2145 if (sband->band == IEEE80211_BAND_5GHZ)
2146 i -= IWL_FIRST_OFDM_RATE;
2147 info->control.rates[0].idx = i;
2150 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2153 struct iwl_lq_sta *lq_sta;
2154 struct iwl_priv *priv;
2157 priv = (struct iwl_priv *)priv_rate;
2158 IWL_DEBUG_RATE("create station rate scale window\n");
2160 lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2164 lq_sta->lq.sta_id = 0xff;
2167 for (j = 0; j < LQ_SIZE; j++)
2168 for (i = 0; i < IWL_RATE_COUNT; i++)
2169 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2174 static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
2175 struct ieee80211_sta *sta, void *priv_sta)
2178 struct iwl_priv *priv = (struct iwl_priv *)priv_r;
2179 struct ieee80211_conf *conf = &priv->hw->conf;
2180 struct iwl_lq_sta *lq_sta = priv_sta;
2182 lq_sta->flush_timer = 0;
2183 lq_sta->supp_rates = sta->supp_rates[sband->band];
2184 for (j = 0; j < LQ_SIZE; j++)
2185 for (i = 0; i < IWL_RATE_COUNT; i++)
2186 rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2188 IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2189 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2190 * the lowest or the highest rate.. Could consider using RSSI from
2191 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2194 lq_sta->ibss_sta_added = 0;
2195 if (priv->iw_mode == NL80211_IFTYPE_AP) {
2196 u8 sta_id = iwl_find_station(priv, sta->addr);
2198 /* for IBSS the call are from tasklet */
2199 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2201 if (sta_id == IWL_INVALID_STATION) {
2202 IWL_DEBUG_RATE("LQ: ADD station %pM\n", sta->addr);
2203 sta_id = iwl_add_station_flags(priv, sta->addr,
2204 0, CMD_ASYNC, NULL);
2206 if ((sta_id != IWL_INVALID_STATION)) {
2207 lq_sta->lq.sta_id = sta_id;
2208 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2210 /* FIXME: this is w/a remove it later */
2211 priv->assoc_station_added = 1;
2214 /* Find highest tx rate supported by hardware and destination station */
2215 lq_sta->last_txrate_idx = 3;
2216 for (i = 0; i < sband->n_bitrates; i++)
2217 if (sta->supp_rates[sband->band] & BIT(i))
2218 lq_sta->last_txrate_idx = i;
2220 /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2221 if (sband->band == IEEE80211_BAND_5GHZ)
2222 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2225 lq_sta->is_green = rs_use_green(priv, conf);
2226 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2227 lq_sta->active_rate_basic = priv->active_rate_basic;
2228 lq_sta->band = priv->band;
2230 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2231 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2233 lq_sta->active_siso_rate = sta->ht_cap.mcs.rx_mask[0] << 1;
2234 lq_sta->active_siso_rate |= sta->ht_cap.mcs.rx_mask[0] & 0x1;
2235 lq_sta->active_siso_rate &= ~((u16)0x2);
2236 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2239 lq_sta->active_mimo2_rate = sta->ht_cap.mcs.rx_mask[1] << 1;
2240 lq_sta->active_mimo2_rate |= sta->ht_cap.mcs.rx_mask[1] & 0x1;
2241 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2242 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2244 lq_sta->active_mimo3_rate = sta->ht_cap.mcs.rx_mask[2] << 1;
2245 lq_sta->active_mimo3_rate |= sta->ht_cap.mcs.rx_mask[2] & 0x1;
2246 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2247 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2249 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2250 lq_sta->active_siso_rate,
2251 lq_sta->active_mimo2_rate,
2252 lq_sta->active_mimo3_rate);
2254 /* These values will be overridden later */
2255 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2256 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2258 /* as default allow aggregation for all tids */
2259 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2262 rs_initialize_lq(priv, conf, sta, lq_sta);
2265 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2266 struct iwl_lq_sta *lq_sta, u32 new_rate)
2268 struct iwl_scale_tbl_info tbl_type;
2271 int repeat_rate = 0;
2272 u8 ant_toggle_cnt = 0;
2273 u8 use_ht_possible = 1;
2274 u8 valid_tx_ant = 0;
2275 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2277 /* Override starting rate (index 0) if needed for debug purposes */
2278 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2280 /* Interpret new_rate (rate_n_flags) */
2281 memset(&tbl_type, 0, sizeof(tbl_type));
2282 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2283 &tbl_type, &rate_idx);
2285 /* How many times should we repeat the initial rate? */
2286 if (is_legacy(tbl_type.lq_type)) {
2288 repeat_rate = IWL_NUMBER_TRY;
2290 repeat_rate = IWL_HT_NUMBER_TRY;
2293 lq_cmd->general_params.mimo_delimiter =
2294 is_mimo(tbl_type.lq_type) ? 1 : 0;
2296 /* Fill 1st table entry (index 0) */
2297 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2299 if (num_of_ant(tbl_type.ant_type) == 1) {
2300 lq_cmd->general_params.single_stream_ant_msk =
2302 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2303 lq_cmd->general_params.dual_stream_ant_msk =
2305 } /* otherwise we don't modify the existing value */
2311 valid_tx_ant = priv->hw_params.valid_tx_ant;
2313 /* Fill rest of rate table */
2314 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2315 /* Repeat initial/next rate.
2316 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2317 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2318 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2319 if (is_legacy(tbl_type.lq_type)) {
2320 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2323 rs_toggle_antenna(valid_tx_ant,
2324 &new_rate, &tbl_type))
2328 /* Override next rate if needed for debug purposes */
2329 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2331 /* Fill next table entry */
2332 lq_cmd->rs_table[index].rate_n_flags =
2333 cpu_to_le32(new_rate);
2338 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2341 /* Indicate to uCode which entries might be MIMO.
2342 * If initial rate was MIMO, this will finally end up
2343 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2344 if (is_mimo(tbl_type.lq_type))
2345 lq_cmd->general_params.mimo_delimiter = index;
2348 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2351 /* How many times should we repeat the next rate? */
2352 if (is_legacy(tbl_type.lq_type)) {
2353 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2356 rs_toggle_antenna(valid_tx_ant,
2357 &new_rate, &tbl_type))
2360 repeat_rate = IWL_NUMBER_TRY;
2362 repeat_rate = IWL_HT_NUMBER_TRY;
2365 /* Don't allow HT rates after next pass.
2366 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2367 use_ht_possible = 0;
2369 /* Override next rate if needed for debug purposes */
2370 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2372 /* Fill next table entry */
2373 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2379 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2380 lq_cmd->agg_params.agg_dis_start_th = 3;
2381 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2384 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2388 /* rate scale requires free function to be implemented */
2389 static void rs_free(void *priv_rate)
2394 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
2397 struct iwl_lq_sta *lq_sta = priv_sta;
2398 struct iwl_priv *priv __maybe_unused = priv_r;
2400 IWL_DEBUG_RATE("enter\n");
2402 IWL_DEBUG_RATE("leave\n");
2406 #ifdef CONFIG_MAC80211_DEBUGFS
2407 static int open_file_generic(struct inode *inode, struct file *file)
2409 file->private_data = inode->i_private;
2412 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2413 u32 *rate_n_flags, int index)
2415 struct iwl_priv *priv;
2418 if (lq_sta->dbg_fixed_rate) {
2420 *rate_n_flags = lq_sta->dbg_fixed_rate;
2422 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2423 *rate_n_flags = 0x800D;
2425 *rate_n_flags = 0x820A;
2427 IWL_DEBUG_RATE("Fixed rate ON\n");
2429 IWL_DEBUG_RATE("Fixed rate OFF\n");
2433 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2434 const char __user *user_buf, size_t count, loff_t *ppos)
2436 struct iwl_lq_sta *lq_sta = file->private_data;
2437 struct iwl_priv *priv;
2443 memset(buf, 0, sizeof(buf));
2444 buf_size = min(count, sizeof(buf) - 1);
2445 if (copy_from_user(buf, user_buf, buf_size))
2448 if (sscanf(buf, "%x", &parsed_rate) == 1)
2449 lq_sta->dbg_fixed_rate = parsed_rate;
2451 lq_sta->dbg_fixed_rate = 0;
2453 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2454 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2455 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2456 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2458 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2459 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2461 if (lq_sta->dbg_fixed_rate) {
2462 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2463 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2469 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2470 char __user *user_buf, size_t count, loff_t *ppos)
2476 struct iwl_lq_sta *lq_sta = file->private_data;
2478 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2479 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2480 lq_sta->total_failed, lq_sta->total_success,
2481 lq_sta->active_legacy_rate);
2482 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2483 lq_sta->dbg_fixed_rate);
2484 desc += sprintf(buff+desc, "general:"
2485 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2486 lq_sta->lq.general_params.flags,
2487 lq_sta->lq.general_params.mimo_delimiter,
2488 lq_sta->lq.general_params.single_stream_ant_msk,
2489 lq_sta->lq.general_params.dual_stream_ant_msk);
2491 desc += sprintf(buff+desc, "agg:"
2492 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2493 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2494 lq_sta->lq.agg_params.agg_dis_start_th,
2495 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2497 desc += sprintf(buff+desc,
2498 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2499 lq_sta->lq.general_params.start_rate_index[0],
2500 lq_sta->lq.general_params.start_rate_index[1],
2501 lq_sta->lq.general_params.start_rate_index[2],
2502 lq_sta->lq.general_params.start_rate_index[3]);
2505 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2506 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2507 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2509 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2512 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2513 .write = rs_sta_dbgfs_scale_table_write,
2514 .read = rs_sta_dbgfs_scale_table_read,
2515 .open = open_file_generic,
2517 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2518 char __user *user_buf, size_t count, loff_t *ppos)
2524 struct iwl_lq_sta *lq_sta = file->private_data;
2525 for (i = 0; i < LQ_SIZE; i++) {
2526 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2528 lq_sta->active_tbl == i?"*":"x",
2529 lq_sta->lq_info[i].lq_type,
2530 lq_sta->lq_info[i].is_SGI,
2531 lq_sta->lq_info[i].is_fat,
2532 lq_sta->lq_info[i].is_dup,
2533 lq_sta->lq_info[i].current_rate);
2534 for (j = 0; j < IWL_RATE_COUNT; j++) {
2535 desc += sprintf(buff+desc,
2536 "counter=%d success=%d %%=%d\n",
2537 lq_sta->lq_info[i].win[j].counter,
2538 lq_sta->lq_info[i].win[j].success_counter,
2539 lq_sta->lq_info[i].win[j].success_ratio);
2542 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2545 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2546 .read = rs_sta_dbgfs_stats_table_read,
2547 .open = open_file_generic,
2550 static void rs_add_debugfs(void *priv, void *priv_sta,
2553 struct iwl_lq_sta *lq_sta = priv_sta;
2554 lq_sta->rs_sta_dbgfs_scale_table_file =
2555 debugfs_create_file("rate_scale_table", 0600, dir,
2556 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2557 lq_sta->rs_sta_dbgfs_stats_table_file =
2558 debugfs_create_file("rate_stats_table", 0600, dir,
2559 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2560 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2561 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2562 &lq_sta->tx_agg_tid_en);
2566 static void rs_remove_debugfs(void *priv, void *priv_sta)
2568 struct iwl_lq_sta *lq_sta = priv_sta;
2569 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2570 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2571 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2575 static struct rate_control_ops rs_ops = {
2578 .tx_status = rs_tx_status,
2579 .get_rate = rs_get_rate,
2580 .rate_init = rs_rate_init,
2583 .alloc_sta = rs_alloc_sta,
2584 .free_sta = rs_free_sta,
2585 #ifdef CONFIG_MAC80211_DEBUGFS
2586 .add_sta_debugfs = rs_add_debugfs,
2587 .remove_sta_debugfs = rs_remove_debugfs,
2591 int iwlagn_rate_control_register(void)
2593 return ieee80211_rate_control_register(&rs_ops);
2596 void iwlagn_rate_control_unregister(void)
2598 ieee80211_rate_control_unregister(&rs_ops);