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>
38 #include "../net/mac80211/rate.h"
42 #include "iwl-helpers.h"
44 #define RS_NAME "iwl-4965-rs"
46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
57 static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
67 static const u8 ant_toggle_lookup[] = {
68 /*ANT_NONE -> */ ANT_NONE,
71 /*ANT_AB -> */ ANT_BC,
73 /*ANT_AC -> */ ANT_AB,
74 /*ANT_BC -> */ ANT_AC,
75 /*ANT_ABC -> */ ANT_ABC,
79 * struct iwl4965_rate_scale_data -- tx success history for one rate
81 struct iwl4965_rate_scale_data {
82 u64 data; /* bitmap of successful frames */
83 s32 success_counter; /* number of frames successful */
84 s32 success_ratio; /* per-cent * 128 */
85 s32 counter; /* number of frames attempted */
86 s32 average_tpt; /* success ratio * expected throughput */
91 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
93 * There are two of these in struct iwl4965_lq_sta,
94 * one for "active", and one for "search".
96 struct iwl4965_scale_tbl_info {
97 enum iwl_table_type lq_type;
99 u8 is_SGI; /* 1 = short guard interval */
100 u8 is_fat; /* 1 = 40 MHz channel width */
101 u8 is_dup; /* 1 = duplicated data streams */
102 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
103 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
104 u32 current_rate; /* rate_n_flags, uCode API format */
105 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
108 struct iwl4965_traffic_load {
109 unsigned long time_stamp; /* age of the oldest statistics */
110 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
112 u32 total; /* total num of packets during the
113 * last TID_MAX_TIME_DIFF */
114 u8 queue_count; /* number of queues that has
115 * been used since the last cleanup */
116 u8 head; /* start of the circular buffer */
120 * struct iwl4965_lq_sta -- driver's rate scaling private structure
122 * Pointer to this gets passed back and forth between driver and mac80211.
124 struct iwl4965_lq_sta {
125 u8 active_tbl; /* index of active table, range 0-1 */
126 u8 enable_counter; /* indicates HT mode */
127 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
128 u8 search_better_tbl; /* 1: currently trying alternate mode */
131 /* The following determine when to search for a new mode */
132 u32 table_count_limit;
133 u32 max_failure_limit; /* # failed frames before new search */
134 u32 max_success_limit; /* # successful frames before new search */
136 u32 total_failed; /* total failed frames, any/all rates */
137 u32 total_success; /* total successful frames, any/all rates */
138 u32 flush_timer; /* time staying in mode before new search */
140 u8 action_counter; /* # mode-switch actions tried */
143 enum ieee80211_band band;
146 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
148 u16 active_legacy_rate;
149 u16 active_siso_rate;
150 u16 active_mimo2_rate;
151 u16 active_mimo3_rate;
152 u16 active_rate_basic;
154 struct iwl_link_quality_cmd lq;
155 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
156 struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
158 #ifdef CONFIG_MAC80211_DEBUGFS
159 struct dentry *rs_sta_dbgfs_scale_table_file;
160 struct dentry *rs_sta_dbgfs_stats_table_file;
161 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
164 struct iwl_priv *drv;
167 static void rs_rate_scale_perform(struct iwl_priv *priv,
168 struct net_device *dev,
169 struct ieee80211_hdr *hdr,
170 struct sta_info *sta);
171 static void rs_fill_link_cmd(const struct iwl_priv *priv,
172 struct iwl4965_lq_sta *lq_sta,
176 #ifdef CONFIG_MAC80211_DEBUGFS
177 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
178 u32 *rate_n_flags, int index);
180 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
181 u32 *rate_n_flags, int index)
186 * Expected throughput metrics for following rates:
187 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
188 * "G" is the only table that supports CCK (the first 4 rates).
190 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
192 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
196 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
200 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
204 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
208 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
212 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
216 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
220 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
224 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
228 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
231 static inline u8 rs_extract_rate(u32 rate_n_flags)
233 return (u8)(rate_n_flags & 0xFF);
236 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
239 window->success_counter = 0;
240 window->success_ratio = IWL_INVALID_VALUE;
242 window->average_tpt = IWL_INVALID_VALUE;
246 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
248 return ((ant_type & valid_antenna) == ant_type);
252 * removes the old data from the statistics. All data that is older than
253 * TID_MAX_TIME_DIFF, will be deleted.
255 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
257 /* The oldest age we want to keep */
258 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
260 while (tl->queue_count &&
261 (tl->time_stamp < oldest_time)) {
262 tl->total -= tl->packet_count[tl->head];
263 tl->packet_count[tl->head] = 0;
264 tl->time_stamp += TID_QUEUE_CELL_SPACING;
267 if (tl->head >= TID_QUEUE_MAX_SIZE)
273 * increment traffic load value for tid and also remove
274 * any old values if passed the certain time period
276 static u8 rs_tl_add_packet(struct iwl4965_lq_sta *lq_data,
277 struct ieee80211_hdr *hdr)
279 u32 curr_time = jiffies_to_msecs(jiffies);
282 struct iwl4965_traffic_load *tl = NULL;
283 u16 fc = le16_to_cpu(hdr->frame_control);
286 if (ieee80211_is_qos_data(fc)) {
287 u8 *qc = ieee80211_get_qos_ctrl(hdr, ieee80211_get_hdrlen(fc));
290 return MAX_TID_COUNT;
292 tl = &lq_data->load[tid];
294 curr_time -= curr_time % TID_ROUND_VALUE;
296 /* Happens only for the first packet. Initialize the data */
297 if (!(tl->queue_count)) {
299 tl->time_stamp = curr_time;
302 tl->packet_count[0] = 1;
303 return MAX_TID_COUNT;
306 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
307 index = time_diff / TID_QUEUE_CELL_SPACING;
309 /* The history is too long: remove data that is older than */
310 /* TID_MAX_TIME_DIFF */
311 if (index >= TID_QUEUE_MAX_SIZE)
312 rs_tl_rm_old_stats(tl, curr_time);
314 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
315 tl->packet_count[index] = tl->packet_count[index] + 1;
316 tl->total = tl->total + 1;
318 if ((index + 1) > tl->queue_count)
319 tl->queue_count = index + 1;
325 get the traffic load value for tid
327 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
329 u32 curr_time = jiffies_to_msecs(jiffies);
332 struct iwl4965_traffic_load *tl = NULL;
334 if (tid >= TID_MAX_LOAD_COUNT)
337 tl = &(lq_data->load[tid]);
339 curr_time -= curr_time % TID_ROUND_VALUE;
341 if (!(tl->queue_count))
344 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
345 index = time_diff / TID_QUEUE_CELL_SPACING;
347 /* The history is too long: remove data that is older than */
348 /* TID_MAX_TIME_DIFF */
349 if (index >= TID_QUEUE_MAX_SIZE)
350 rs_tl_rm_old_stats(tl, curr_time);
355 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
356 struct iwl4965_lq_sta *lq_data, u8 tid,
357 struct sta_info *sta)
360 DECLARE_MAC_BUF(mac);
362 spin_lock_bh(&sta->lock);
363 state = sta->ampdu_mlme.tid_state_tx[tid];
364 spin_unlock_bh(&sta->lock);
366 if (state == HT_AGG_STATE_IDLE &&
367 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
368 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
369 print_mac(mac, sta->addr), tid);
370 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
374 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
375 struct iwl4965_lq_sta *lq_data,
376 struct sta_info *sta)
378 if ((tid < TID_MAX_LOAD_COUNT))
379 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
380 else if (tid == IWL_AGG_ALL_TID)
381 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
382 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
385 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
387 return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
388 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
389 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
393 * rs_collect_tx_data - Update the success/failure sliding window
395 * We keep a sliding window of the last 62 packets transmitted
396 * at this rate. window->data contains the bitmask of successful
399 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
400 int scale_index, s32 tpt, int retries,
403 struct iwl4965_rate_scale_data *window = NULL;
404 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
407 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
410 /* Select data for current tx bit rate */
411 window = &(windows[scale_index]);
414 * Keep track of only the latest 62 tx frame attempts in this rate's
415 * history window; anything older isn't really relevant any more.
416 * If we have filled up the sliding window, drop the oldest attempt;
417 * if the oldest attempt (highest bit in bitmap) shows "success",
418 * subtract "1" from the success counter (this is the main reason
419 * we keep these bitmaps!).
421 while (retries > 0) {
422 if (window->counter >= IWL_RATE_MAX_WINDOW) {
424 /* remove earliest */
425 window->counter = IWL_RATE_MAX_WINDOW - 1;
427 if (window->data & mask) {
428 window->data &= ~mask;
429 window->success_counter--;
433 /* Increment frames-attempted counter */
436 /* Shift bitmap by one frame (throw away oldest history),
437 * OR in "1", and increment "success" if this
438 * frame was successful. */
441 window->success_counter++;
449 /* Calculate current success ratio, avoid divide-by-0! */
450 if (window->counter > 0)
451 window->success_ratio = 128 * (100 * window->success_counter)
454 window->success_ratio = IWL_INVALID_VALUE;
456 fail_count = window->counter - window->success_counter;
458 /* Calculate average throughput, if we have enough history. */
459 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
460 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
461 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
463 window->average_tpt = IWL_INVALID_VALUE;
465 /* Tag this window as having been updated */
466 window->stamp = jiffies;
472 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
474 /* FIXME:RS:remove this function and put the flags statically in the table */
475 static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
476 int index, u8 use_green)
478 u32 rate_n_flags = 0;
480 if (is_legacy(tbl->lq_type)) {
481 rate_n_flags = iwl_rates[index].plcp;
482 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
483 rate_n_flags |= RATE_MCS_CCK_MSK;
485 } else if (is_Ht(tbl->lq_type)) {
486 if (index > IWL_LAST_OFDM_RATE) {
487 IWL_ERROR("invalid HT rate index %d\n", index);
488 index = IWL_LAST_OFDM_RATE;
490 rate_n_flags = RATE_MCS_HT_MSK;
492 if (is_siso(tbl->lq_type))
493 rate_n_flags |= iwl_rates[index].plcp_siso;
494 else if (is_mimo2(tbl->lq_type))
495 rate_n_flags |= iwl_rates[index].plcp_mimo2;
497 rate_n_flags |= iwl_rates[index].plcp_mimo3;
499 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
502 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
503 RATE_MCS_ANT_ABC_MSK);
505 if (is_Ht(tbl->lq_type)) {
508 rate_n_flags |= RATE_MCS_DUP_MSK;
510 rate_n_flags |= RATE_MCS_FAT_MSK;
513 rate_n_flags |= RATE_MCS_SGI_MSK;
516 rate_n_flags |= RATE_MCS_GF_MSK;
517 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
518 rate_n_flags &= ~RATE_MCS_SGI_MSK;
519 IWL_ERROR("GF was set with SGI:SISO\n");
527 * Interpret uCode API's rate_n_flags format,
528 * fill "search" or "active" tx mode table.
530 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
531 enum ieee80211_band band,
532 struct iwl4965_scale_tbl_info *tbl,
535 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
536 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
539 *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
541 if (*rate_idx == IWL_RATE_INVALID) {
545 tbl->is_SGI = 0; /* default legacy setup */
548 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
549 tbl->lq_type = LQ_NONE;
551 /* legacy rate format */
552 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
553 if (num_of_ant == 1) {
554 if (band == IEEE80211_BAND_5GHZ)
561 if (rate_n_flags & RATE_MCS_SGI_MSK)
564 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
565 (rate_n_flags & RATE_MCS_DUP_MSK))
568 if (rate_n_flags & RATE_MCS_DUP_MSK)
571 mcs = rs_extract_rate(rate_n_flags);
574 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
576 tbl->lq_type = LQ_SISO; /*else NONE*/
578 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
580 tbl->lq_type = LQ_MIMO2;
584 tbl->lq_type = LQ_MIMO3;
590 /* switch to another antenna/antennas and return 1 */
591 /* if no other valid antenna found, return 0 */
592 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
593 struct iwl4965_scale_tbl_info *tbl)
597 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
600 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
603 new_ant_type = ant_toggle_lookup[tbl->ant_type];
605 while ((new_ant_type != tbl->ant_type) &&
606 !rs_is_valid_ant(valid_ant, new_ant_type))
607 new_ant_type = ant_toggle_lookup[new_ant_type];
609 if (new_ant_type == tbl->ant_type)
612 tbl->ant_type = new_ant_type;
613 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
614 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
618 /* FIXME:RS: in 4965 we don't use greenfield at all */
619 /* FIXME:RS: don't use greenfield for now in TX */
621 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
623 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
624 priv->current_ht_config.is_green_field &&
625 !priv->current_ht_config.non_GF_STA_present);
628 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
634 * rs_get_supported_rates - get the available rates
636 * if management frame or broadcast frame only return
637 * basic available rates.
640 static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
641 struct ieee80211_hdr *hdr,
642 enum iwl_table_type rate_type)
644 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
645 lq_sta->active_rate_basic)
646 return lq_sta->active_rate_basic;
648 if (is_legacy(rate_type)) {
649 return lq_sta->active_legacy_rate;
651 if (is_siso(rate_type))
652 return lq_sta->active_siso_rate;
653 else if (is_mimo2(rate_type))
654 return lq_sta->active_mimo2_rate;
656 return lq_sta->active_mimo3_rate;
660 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
663 u8 high = IWL_RATE_INVALID;
664 u8 low = IWL_RATE_INVALID;
666 /* 802.11A or ht walks to the next literal adjacent rate in
668 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
672 /* Find the previous rate that is in the rate mask */
674 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
675 if (rate_mask & mask) {
681 /* Find the next rate that is in the rate mask */
683 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
684 if (rate_mask & mask) {
690 return (high << 8) | low;
694 while (low != IWL_RATE_INVALID) {
695 low = iwl_rates[low].prev_rs;
696 if (low == IWL_RATE_INVALID)
698 if (rate_mask & (1 << low))
700 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
704 while (high != IWL_RATE_INVALID) {
705 high = iwl_rates[high].next_rs;
706 if (high == IWL_RATE_INVALID)
708 if (rate_mask & (1 << high))
710 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
713 return (high << 8) | low;
716 static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
717 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
723 u8 switch_to_legacy = 0;
724 u8 is_green = lq_sta->is_green;
726 /* check if we need to switch from HT to legacy rates.
727 * assumption is that mandatory rates (1Mbps or 6Mbps)
728 * are always supported (spec demand) */
729 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
730 switch_to_legacy = 1;
731 scale_index = rs_ht_to_legacy[scale_index];
732 if (lq_sta->band == IEEE80211_BAND_5GHZ)
737 if (num_of_ant(tbl->ant_type) > 1)
738 tbl->ant_type = ANT_A;/*FIXME:RS*/
744 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
746 /* Mask with station rate restriction */
747 if (is_legacy(tbl->lq_type)) {
748 /* supp_rates has no CCK bits in A mode */
749 if (lq_sta->band == IEEE80211_BAND_5GHZ)
750 rate_mask = (u16)(rate_mask &
751 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
753 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
756 /* If we switched from HT to legacy, check current rate */
757 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
762 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
764 low = high_low & 0xff;
766 if (low == IWL_RATE_INVALID)
770 return rate_n_flags_from_tbl(tbl, low, is_green);
774 * mac80211 sends us Tx status
776 static void rs_tx_status(void *priv_rate, struct net_device *dev,
781 int rs_index, index = 0;
782 struct iwl4965_lq_sta *lq_sta;
783 struct iwl_link_quality_cmd *table;
784 struct sta_info *sta;
785 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
786 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
787 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
788 struct ieee80211_hw *hw = local_to_hw(local);
789 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
790 struct iwl4965_rate_scale_data *window = NULL;
791 struct iwl4965_rate_scale_data *search_win = NULL;
793 struct iwl4965_scale_tbl_info tbl_type;
794 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
796 u16 fc = le16_to_cpu(hdr->frame_control);
799 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
801 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
804 /* This packet was aggregated but doesn't carry rate scale info */
805 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
806 !(info->flags & IEEE80211_TX_STAT_AMPDU))
809 retries = info->status.retry_count;
816 sta = sta_info_get(local, hdr->addr1);
818 if (!sta || !sta->rate_ctrl_priv)
822 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
824 if (!priv->lq_mngr.lq_ready)
827 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
828 !lq_sta->ibss_sta_added)
832 active_index = lq_sta->active_tbl;
834 curr_tbl = &(lq_sta->lq_info[active_index]);
835 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
836 window = (struct iwl4965_rate_scale_data *)
838 search_win = (struct iwl4965_rate_scale_data *)
839 &(search_tbl->win[0]);
842 * Ignore this Tx frame response if its initial rate doesn't match
843 * that of latest Link Quality command. There may be stragglers
844 * from a previous Link Quality command, but we're no longer interested
845 * in those; they're either from the "active" mode while we're trying
846 * to check "search" mode, or a prior "search" mode after we've moved
847 * to a new "search" mode (which might become the new "active" mode).
849 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
850 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
851 if (priv->band == IEEE80211_BAND_5GHZ)
852 rs_index -= IWL_FIRST_OFDM_RATE;
854 if ((info->tx_rate_idx < 0) ||
856 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
858 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
860 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
861 (tbl_type.ant_type ^ info->antenna_sel_tx) ||
862 (!!(tx_rate & RATE_MCS_HT_MSK) ^
863 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
864 (!!(tx_rate & RATE_MCS_GF_MSK) ^
865 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
866 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
867 hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
868 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
872 /* Update frame history window with "failure" for each Tx retry. */
874 /* Look up the rate and other info used for each tx attempt.
875 * Each tx attempt steps one entry deeper in the rate table. */
876 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
877 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
878 &tbl_type, &rs_index);
880 /* If type matches "search" table,
881 * add failure to "search" history */
882 if ((tbl_type.lq_type == search_tbl->lq_type) &&
883 (tbl_type.ant_type == search_tbl->ant_type) &&
884 (tbl_type.is_SGI == search_tbl->is_SGI)) {
885 if (search_tbl->expected_tpt)
886 tpt = search_tbl->expected_tpt[rs_index];
889 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
891 /* Else if type matches "current/active" table,
892 * add failure to "current/active" history */
893 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
894 (tbl_type.ant_type == curr_tbl->ant_type) &&
895 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
896 if (curr_tbl->expected_tpt)
897 tpt = curr_tbl->expected_tpt[rs_index];
900 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
903 /* If not searching for a new mode, increment failed counter
904 * ... this helps determine when to start searching again */
905 if (lq_sta->stay_in_tbl)
906 lq_sta->total_failed++;
913 * Find (by rate) the history window to update with final Tx attempt;
914 * if Tx was successful first try, use original rate,
915 * else look up the rate that was, finally, successful.
917 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
918 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
920 /* Update frame history window with "success" if Tx got ACKed ... */
921 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
923 /* If type matches "search" table,
924 * add final tx status to "search" history */
925 if ((tbl_type.lq_type == search_tbl->lq_type) &&
926 (tbl_type.ant_type == search_tbl->ant_type) &&
927 (tbl_type.is_SGI == search_tbl->is_SGI)) {
928 if (search_tbl->expected_tpt)
929 tpt = search_tbl->expected_tpt[rs_index];
932 if (info->flags & IEEE80211_TX_CTL_AMPDU)
933 rs_collect_tx_data(search_win, rs_index, tpt,
934 info->status.ampdu_ack_len,
935 info->status.ampdu_ack_map);
937 rs_collect_tx_data(search_win, rs_index, tpt,
939 /* Else if type matches "current/active" table,
940 * add final tx status to "current/active" history */
941 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
942 (tbl_type.ant_type == curr_tbl->ant_type) &&
943 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
944 if (curr_tbl->expected_tpt)
945 tpt = curr_tbl->expected_tpt[rs_index];
948 if (info->flags & IEEE80211_TX_CTL_AMPDU)
949 rs_collect_tx_data(window, rs_index, tpt,
950 info->status.ampdu_ack_len,
951 info->status.ampdu_ack_map);
953 rs_collect_tx_data(window, rs_index, tpt,
957 /* If not searching for new mode, increment success/failed counter
958 * ... these help determine when to start searching again */
959 if (lq_sta->stay_in_tbl) {
960 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
961 lq_sta->total_success += info->status.ampdu_ack_map;
962 lq_sta->total_failed +=
963 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
966 lq_sta->total_success++;
968 lq_sta->total_failed++;
972 /* See if there's a better rate or modulation mode to try. */
973 rs_rate_scale_perform(priv, dev, hdr, sta);
980 * Begin a period of staying with a selected modulation mode.
981 * Set "stay_in_tbl" flag to prevent any mode switches.
982 * Set frame tx success limits according to legacy vs. high-throughput,
983 * and reset overall (spanning all rates) tx success history statistics.
984 * These control how long we stay using same modulation mode before
985 * searching for a new mode.
987 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
988 struct iwl4965_lq_sta *lq_sta)
990 IWL_DEBUG_RATE("we are staying in the same table\n");
991 lq_sta->stay_in_tbl = 1; /* only place this gets set */
993 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
994 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
995 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
997 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
998 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
999 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1001 lq_sta->table_count = 0;
1002 lq_sta->total_failed = 0;
1003 lq_sta->total_success = 0;
1007 * Find correct throughput table for given mode of modulation
1009 static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1010 struct iwl4965_scale_tbl_info *tbl)
1012 if (is_legacy(tbl->lq_type)) {
1013 if (!is_a_band(tbl->lq_type))
1014 tbl->expected_tpt = expected_tpt_G;
1016 tbl->expected_tpt = expected_tpt_A;
1017 } else if (is_siso(tbl->lq_type)) {
1018 if (tbl->is_fat && !lq_sta->is_dup)
1020 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1022 tbl->expected_tpt = expected_tpt_siso40MHz;
1023 else if (tbl->is_SGI)
1024 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1026 tbl->expected_tpt = expected_tpt_siso20MHz;
1028 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1029 if (tbl->is_fat && !lq_sta->is_dup)
1031 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1033 tbl->expected_tpt = expected_tpt_mimo40MHz;
1034 else if (tbl->is_SGI)
1035 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1037 tbl->expected_tpt = expected_tpt_mimo20MHz;
1039 tbl->expected_tpt = expected_tpt_G;
1043 * Find starting rate for new "search" high-throughput mode of modulation.
1044 * Goal is to find lowest expected rate (under perfect conditions) that is
1045 * above the current measured throughput of "active" mode, to give new mode
1046 * a fair chance to prove itself without too many challenges.
1048 * This gets called when transitioning to more aggressive modulation
1049 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1050 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1051 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1052 * bit rate will typically need to increase, but not if performance was bad.
1054 static s32 rs_get_best_rate(struct iwl_priv *priv,
1055 struct iwl4965_lq_sta *lq_sta,
1056 struct iwl4965_scale_tbl_info *tbl, /* "search" */
1057 u16 rate_mask, s8 index)
1059 /* "active" values */
1060 struct iwl4965_scale_tbl_info *active_tbl =
1061 &(lq_sta->lq_info[lq_sta->active_tbl]);
1062 s32 active_sr = active_tbl->win[index].success_ratio;
1063 s32 active_tpt = active_tbl->expected_tpt[index];
1065 /* expected "search" throughput */
1066 s32 *tpt_tbl = tbl->expected_tpt;
1068 s32 new_rate, high, low, start_hi;
1072 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1075 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1078 low = high_low & 0xff;
1079 high = (high_low >> 8) & 0xff;
1082 * Lower the "search" bit rate, to give new "search" mode
1083 * approximately the same throughput as "active" if:
1085 * 1) "Active" mode has been working modestly well (but not
1086 * great), and expected "search" throughput (under perfect
1087 * conditions) at candidate rate is above the actual
1088 * measured "active" throughput (but less than expected
1089 * "active" throughput under perfect conditions).
1091 * 2) "Active" mode has been working perfectly or very well
1092 * and expected "search" throughput (under perfect
1093 * conditions) at candidate rate is above expected
1094 * "active" throughput (under perfect conditions).
1096 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1097 ((active_sr > IWL_RATE_DECREASE_TH) &&
1098 (active_sr <= IWL_RATE_HIGH_TH) &&
1099 (tpt_tbl[rate] <= active_tpt))) ||
1100 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1101 (tpt_tbl[rate] > active_tpt))) {
1103 /* (2nd or later pass)
1104 * If we've already tried to raise the rate, and are
1105 * now trying to lower it, use the higher rate. */
1106 if (start_hi != IWL_RATE_INVALID) {
1107 new_rate = start_hi;
1113 /* Loop again with lower rate */
1114 if (low != IWL_RATE_INVALID)
1117 /* Lower rate not available, use the original */
1121 /* Else try to raise the "search" rate to match "active" */
1123 /* (2nd or later pass)
1124 * If we've already tried to lower the rate, and are
1125 * now trying to raise it, use the lower rate. */
1126 if (new_rate != IWL_RATE_INVALID)
1129 /* Loop again with higher rate */
1130 else if (high != IWL_RATE_INVALID) {
1134 /* Higher rate not available, use the original */
1145 * Set up search table for MIMO
1147 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1148 struct iwl4965_lq_sta *lq_sta,
1149 struct ieee80211_conf *conf,
1150 struct sta_info *sta,
1151 struct iwl4965_scale_tbl_info *tbl, int index)
1155 s8 is_green = lq_sta->is_green;
1157 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1158 !sta->ht_info.ht_supported)
1161 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1164 /* Need both Tx chains/antennas to support MIMO */
1165 if (priv->hw_params.tx_chains_num < 2)
1168 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1170 tbl->lq_type = LQ_MIMO2;
1171 tbl->is_dup = lq_sta->is_dup;
1173 rate_mask = lq_sta->active_mimo2_rate;
1175 if (priv->current_ht_config.supported_chan_width
1176 == IWL_CHANNEL_WIDTH_40MHZ)
1181 /* FIXME: - don't toggle SGI here
1183 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1187 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
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("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1199 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1200 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1204 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1206 IWL_DEBUG_RATE("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 iwl4965_lq_sta *lq_sta,
1216 struct ieee80211_conf *conf,
1217 struct sta_info *sta,
1218 struct iwl4965_scale_tbl_info *tbl, int index)
1221 u8 is_green = lq_sta->is_green;
1224 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1225 !sta->ht_info.ht_supported)
1228 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1230 tbl->is_dup = lq_sta->is_dup;
1231 tbl->lq_type = LQ_SISO;
1233 rate_mask = lq_sta->active_siso_rate;
1235 if (priv->current_ht_config.supported_chan_width
1236 == IWL_CHANNEL_WIDTH_40MHZ)
1241 /* FIXME: - don't toggle SGI here
1243 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1247 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1254 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1256 rs_set_expected_tpt_table(lq_sta, tbl);
1257 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1259 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1260 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1261 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1265 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1266 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1267 tbl->current_rate, is_green);
1272 * Try to switch to new modulation mode from legacy
1274 static int rs_move_legacy_other(struct iwl_priv *priv,
1275 struct iwl4965_lq_sta *lq_sta,
1276 struct ieee80211_conf *conf,
1277 struct sta_info *sta,
1280 struct iwl4965_scale_tbl_info *tbl =
1281 &(lq_sta->lq_info[lq_sta->active_tbl]);
1282 struct iwl4965_scale_tbl_info *search_tbl =
1283 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1284 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1285 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1286 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1287 u8 start_action = tbl->action;
1288 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1292 switch (tbl->action) {
1293 case IWL_LEGACY_SWITCH_ANTENNA:
1294 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1296 lq_sta->action_counter++;
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 lq_sta->search_better_tbl = 1;
1311 case IWL_LEGACY_SWITCH_SISO:
1312 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1314 /* Set up search table to try SISO */
1315 memcpy(search_tbl, tbl, sz);
1316 search_tbl->is_SGI = 0;
1317 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1320 lq_sta->search_better_tbl = 1;
1321 lq_sta->action_counter = 0;
1326 case IWL_LEGACY_SWITCH_MIMO2:
1327 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1329 /* Set up search table to try MIMO */
1330 memcpy(search_tbl, tbl, sz);
1331 search_tbl->is_SGI = 0;
1332 search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1333 /*FIXME:RS:need to check ant validity*/
1334 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1337 lq_sta->search_better_tbl = 1;
1338 lq_sta->action_counter = 0;
1344 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1345 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1347 if (tbl->action == start_action)
1355 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1356 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1362 * Try to switch to new modulation mode from SISO
1364 static int rs_move_siso_to_other(struct iwl_priv *priv,
1365 struct iwl4965_lq_sta *lq_sta,
1366 struct ieee80211_conf *conf,
1367 struct sta_info *sta,
1370 u8 is_green = lq_sta->is_green;
1371 struct iwl4965_scale_tbl_info *tbl =
1372 &(lq_sta->lq_info[lq_sta->active_tbl]);
1373 struct iwl4965_scale_tbl_info *search_tbl =
1374 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1375 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1376 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1377 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1378 u8 start_action = tbl->action;
1379 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1383 lq_sta->action_counter++;
1384 switch (tbl->action) {
1385 case IWL_SISO_SWITCH_ANTENNA:
1386 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1387 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1390 memcpy(search_tbl, tbl, sz);
1391 if (rs_toggle_antenna(valid_tx_ant,
1392 &search_tbl->current_rate, search_tbl)) {
1393 lq_sta->search_better_tbl = 1;
1397 case IWL_SISO_SWITCH_MIMO2:
1398 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1399 memcpy(search_tbl, tbl, sz);
1400 search_tbl->is_SGI = 0;
1401 search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1402 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1405 lq_sta->search_better_tbl = 1;
1409 case IWL_SISO_SWITCH_GI:
1411 !(priv->current_ht_config.sgf &
1415 !(priv->current_ht_config.sgf &
1419 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1421 memcpy(search_tbl, tbl, sz);
1426 IWL_ERROR("SGI was set in GF+SISO\n");
1428 search_tbl->is_SGI = !tbl->is_SGI;
1429 rs_set_expected_tpt_table(lq_sta, search_tbl);
1431 s32 tpt = lq_sta->last_tpt / 100;
1432 if (tpt >= search_tbl->expected_tpt[index])
1435 search_tbl->current_rate = rate_n_flags_from_tbl(
1436 search_tbl, index, is_green);
1437 lq_sta->search_better_tbl = 1;
1441 if (tbl->action > IWL_SISO_SWITCH_GI)
1442 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1444 if (tbl->action == start_action)
1451 if (tbl->action > IWL_SISO_SWITCH_GI)
1452 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1457 * Try to switch to new modulation mode from MIMO
1459 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1460 struct iwl4965_lq_sta *lq_sta,
1461 struct ieee80211_conf *conf,
1462 struct sta_info *sta,
1465 s8 is_green = lq_sta->is_green;
1466 struct iwl4965_scale_tbl_info *tbl =
1467 &(lq_sta->lq_info[lq_sta->active_tbl]);
1468 struct iwl4965_scale_tbl_info *search_tbl =
1469 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1470 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1471 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1472 u8 start_action = tbl->action;
1473 /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1477 lq_sta->action_counter++;
1478 switch (tbl->action) {
1479 case IWL_MIMO_SWITCH_ANTENNA_A:
1480 case IWL_MIMO_SWITCH_ANTENNA_B:
1481 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1483 /* Set up new search table for SISO */
1484 memcpy(search_tbl, tbl, sz);
1486 /*FIXME:RS:need to check ant validity + C*/
1487 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1488 search_tbl->ant_type = ANT_A;
1490 search_tbl->ant_type = ANT_B;
1492 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1495 lq_sta->search_better_tbl = 1;
1500 case IWL_MIMO_SWITCH_GI:
1502 !(priv->current_ht_config.sgf &
1506 !(priv->current_ht_config.sgf &
1510 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1512 /* Set up new search table for MIMO */
1513 memcpy(search_tbl, tbl, sz);
1514 search_tbl->is_SGI = !tbl->is_SGI;
1515 rs_set_expected_tpt_table(lq_sta, search_tbl);
1517 * If active table already uses the fastest possible
1518 * modulation (dual stream with short guard interval),
1519 * and it's working well, there's no need to look
1520 * for a better type of modulation!
1523 s32 tpt = lq_sta->last_tpt / 100;
1524 if (tpt >= search_tbl->expected_tpt[index])
1527 search_tbl->current_rate = rate_n_flags_from_tbl(
1528 search_tbl, index, is_green);
1529 lq_sta->search_better_tbl = 1;
1534 if (tbl->action > IWL_MIMO_SWITCH_GI)
1535 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1537 if (tbl->action == start_action)
1544 if (tbl->action > IWL_MIMO_SWITCH_GI)
1545 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1551 * Check whether we should continue using same modulation mode, or
1552 * begin search for a new mode, based on:
1553 * 1) # tx successes or failures while using this mode
1554 * 2) # times calling this function
1555 * 3) elapsed time in this mode (not used, for now)
1557 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1559 struct iwl4965_scale_tbl_info *tbl;
1562 int flush_interval_passed = 0;
1563 struct iwl_priv *priv;
1566 active_tbl = lq_sta->active_tbl;
1568 tbl = &(lq_sta->lq_info[active_tbl]);
1570 /* If we've been disallowing search, see if we should now allow it */
1571 if (lq_sta->stay_in_tbl) {
1573 /* Elapsed time using current modulation mode */
1574 if (lq_sta->flush_timer)
1575 flush_interval_passed =
1577 (unsigned long)(lq_sta->flush_timer +
1578 IWL_RATE_SCALE_FLUSH_INTVL));
1581 * Check if we should allow search for new modulation mode.
1582 * If many frames have failed or succeeded, or we've used
1583 * this same modulation for a long time, allow search, and
1584 * reset history stats that keep track of whether we should
1585 * allow a new search. Also (below) reset all bitmaps and
1586 * stats in active history.
1588 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1589 (lq_sta->total_success > lq_sta->max_success_limit) ||
1590 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1591 && (flush_interval_passed))) {
1592 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1593 lq_sta->total_failed,
1594 lq_sta->total_success,
1595 flush_interval_passed);
1597 /* Allow search for new mode */
1598 lq_sta->stay_in_tbl = 0; /* only place reset */
1599 lq_sta->total_failed = 0;
1600 lq_sta->total_success = 0;
1601 lq_sta->flush_timer = 0;
1604 * Else if we've used this modulation mode enough repetitions
1605 * (regardless of elapsed time or success/failure), reset
1606 * history bitmaps and rate-specific stats for all rates in
1610 lq_sta->table_count++;
1611 if (lq_sta->table_count >=
1612 lq_sta->table_count_limit) {
1613 lq_sta->table_count = 0;
1615 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1616 for (i = 0; i < IWL_RATE_COUNT; i++)
1617 rs_rate_scale_clear_window(
1622 /* If transitioning to allow "search", reset all history
1623 * bitmaps and stats in active table (this will become the new
1624 * "search" table). */
1625 if (!lq_sta->stay_in_tbl) {
1626 for (i = 0; i < IWL_RATE_COUNT; i++)
1627 rs_rate_scale_clear_window(&(tbl->win[i]));
1633 * Do rate scaling and search for new modulation mode.
1635 static void rs_rate_scale_perform(struct iwl_priv *priv,
1636 struct net_device *dev,
1637 struct ieee80211_hdr *hdr,
1638 struct sta_info *sta)
1640 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1641 struct ieee80211_hw *hw = local_to_hw(local);
1642 struct ieee80211_conf *conf = &hw->conf;
1643 int low = IWL_RATE_INVALID;
1644 int high = IWL_RATE_INVALID;
1647 struct iwl4965_rate_scale_data *window = NULL;
1648 int current_tpt = IWL_INVALID_VALUE;
1649 int low_tpt = IWL_INVALID_VALUE;
1650 int high_tpt = IWL_INVALID_VALUE;
1652 s8 scale_action = 0;
1655 struct iwl4965_lq_sta *lq_sta;
1656 struct iwl4965_scale_tbl_info *tbl, *tbl1;
1657 u16 rate_scale_index_msk = 0;
1664 u8 tid = MAX_TID_COUNT;
1666 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1668 fc = le16_to_cpu(hdr->frame_control);
1669 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1670 /* Send management frames and broadcast/multicast data using
1672 /* TODO: this could probably be improved.. */
1676 if (!sta || !sta->rate_ctrl_priv)
1679 if (!priv->lq_mngr.lq_ready) {
1680 IWL_DEBUG_RATE("still rate scaling not ready\n");
1683 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1685 tid = rs_tl_add_packet(lq_sta, hdr);
1688 * Select rate-scale / modulation-mode table to work with in
1689 * the rest of this function: "search" if searching for better
1690 * modulation mode, or "active" if doing rate scaling within a mode.
1692 if (!lq_sta->search_better_tbl)
1693 active_tbl = lq_sta->active_tbl;
1695 active_tbl = 1 - lq_sta->active_tbl;
1697 tbl = &(lq_sta->lq_info[active_tbl]);
1698 is_green = lq_sta->is_green;
1700 /* current tx rate */
1701 index = sta->last_txrate_idx;
1703 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1706 /* rates available for this association, and for modulation mode */
1707 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1709 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1711 /* mask with station rate restriction */
1712 if (is_legacy(tbl->lq_type)) {
1713 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1714 /* supp_rates has no CCK bits in A mode */
1715 rate_scale_index_msk = (u16) (rate_mask &
1716 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1718 rate_scale_index_msk = (u16) (rate_mask &
1719 lq_sta->supp_rates);
1722 rate_scale_index_msk = rate_mask;
1724 if (!rate_scale_index_msk)
1725 rate_scale_index_msk = rate_mask;
1727 if (!((1 << index) & rate_scale_index_msk)) {
1728 IWL_ERROR("Current Rate is not valid\n");
1732 /* Get expected throughput table and history window for current rate */
1733 if (!tbl->expected_tpt) {
1734 IWL_ERROR("tbl->expected_tpt is NULL\n");
1738 window = &(tbl->win[index]);
1741 * If there is not enough history to calculate actual average
1742 * throughput, keep analyzing results of more tx frames, without
1743 * changing rate or mode (bypass most of the rest of this function).
1744 * Set up new rate table in uCode only if old rate is not supported
1745 * in current association (use new rate found above).
1747 fail_count = window->counter - window->success_counter;
1748 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1749 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1750 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1752 window->success_counter, window->counter, index);
1754 /* Can't calculate this yet; not enough history */
1755 window->average_tpt = IWL_INVALID_VALUE;
1757 /* Should we stay with this modulation mode,
1758 * or search for a new one? */
1759 rs_stay_in_table(lq_sta);
1763 /* Else we have enough samples; calculate estimate of
1764 * actual average throughput */
1766 /*FIXME:RS remove this else if we don't get this error*/
1767 if (window->average_tpt != ((window->success_ratio *
1768 tbl->expected_tpt[index] + 64) / 128)) {
1769 IWL_ERROR("expected_tpt should have been calculated"
1771 window->average_tpt = ((window->success_ratio *
1772 tbl->expected_tpt[index] + 64) / 128);
1776 /* If we are searching for better modulation mode, check success. */
1777 if (lq_sta->search_better_tbl) {
1779 /* If good success, continue using the "search" mode;
1780 * no need to send new link quality command, since we're
1781 * continuing to use the setup that we've been trying. */
1782 if (window->average_tpt > lq_sta->last_tpt) {
1784 IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1785 "suc=%d cur-tpt=%d old-tpt=%d\n",
1786 window->success_ratio,
1787 window->average_tpt,
1790 if (!is_legacy(tbl->lq_type))
1791 lq_sta->enable_counter = 1;
1793 /* Swap tables; "search" becomes "active" */
1794 lq_sta->active_tbl = active_tbl;
1795 current_tpt = window->average_tpt;
1797 /* Else poor success; go back to mode in "active" table */
1800 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1801 "suc=%d cur-tpt=%d old-tpt=%d\n",
1802 window->success_ratio,
1803 window->average_tpt,
1806 /* Nullify "search" table */
1807 tbl->lq_type = LQ_NONE;
1809 /* Revert to "active" table */
1810 active_tbl = lq_sta->active_tbl;
1811 tbl = &(lq_sta->lq_info[active_tbl]);
1813 /* Revert to "active" rate and throughput info */
1814 index = iwl4965_hwrate_to_plcp_idx(
1816 current_tpt = lq_sta->last_tpt;
1818 /* Need to set up a new rate table in uCode */
1822 /* Either way, we've made a decision; modulation mode
1823 * search is done, allow rate adjustment next time. */
1824 lq_sta->search_better_tbl = 0;
1825 done_search = 1; /* Don't switch modes below! */
1829 /* (Else) not in search of better modulation mode, try for better
1830 * starting rate, while staying in this mode. */
1831 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1833 low = high_low & 0xff;
1834 high = (high_low >> 8) & 0xff;
1836 sr = window->success_ratio;
1838 /* Collect measured throughputs for current and adjacent rates */
1839 current_tpt = window->average_tpt;
1840 if (low != IWL_RATE_INVALID)
1841 low_tpt = tbl->win[low].average_tpt;
1842 if (high != IWL_RATE_INVALID)
1843 high_tpt = tbl->win[high].average_tpt;
1847 /* Too many failures, decrease rate */
1848 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1849 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1852 /* No throughput measured yet for adjacent rates; try increase. */
1853 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1854 (high_tpt == IWL_INVALID_VALUE)) {
1856 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1858 else if (low != IWL_RATE_INVALID)
1862 /* Both adjacent throughputs are measured, but neither one has better
1863 * throughput; we're using the best rate, don't change it! */
1864 else if ((low_tpt != IWL_INVALID_VALUE) &&
1865 (high_tpt != IWL_INVALID_VALUE) &&
1866 (low_tpt < current_tpt) &&
1867 (high_tpt < current_tpt))
1870 /* At least one adjacent rate's throughput is measured,
1871 * and may have better performance. */
1873 /* Higher adjacent rate's throughput is measured */
1874 if (high_tpt != IWL_INVALID_VALUE) {
1875 /* Higher rate has better throughput */
1876 if (high_tpt > current_tpt &&
1877 sr >= IWL_RATE_INCREASE_TH) {
1881 ("decrease rate because of high tpt\n");
1885 /* Lower adjacent rate's throughput is measured */
1886 } else if (low_tpt != IWL_INVALID_VALUE) {
1887 /* Lower rate has better throughput */
1888 if (low_tpt > current_tpt) {
1890 ("decrease rate because of low tpt\n");
1892 } else if (sr >= IWL_RATE_INCREASE_TH) {
1898 /* Sanity check; asked for decrease, but success rate or throughput
1899 * has been good at old rate. Don't change it. */
1900 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1901 ((sr > IWL_RATE_HIGH_TH) ||
1902 (current_tpt > (100 * tbl->expected_tpt[low]))))
1905 switch (scale_action) {
1907 /* Decrease starting rate, update uCode's rate table */
1908 if (low != IWL_RATE_INVALID) {
1914 /* Increase starting rate, update uCode's rate table */
1915 if (high != IWL_RATE_INVALID) {
1927 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1928 "high %d type %d\n",
1929 index, scale_action, low, high, tbl->lq_type);
1932 /* Replace uCode's rate table for the destination station. */
1934 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1935 rs_fill_link_cmd(priv, lq_sta, rate);
1936 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1939 /* Should we stay with this modulation mode, or search for a new one? */
1940 rs_stay_in_table(lq_sta);
1943 * Search for new modulation mode if we're:
1944 * 1) Not changing rates right now
1945 * 2) Not just finishing up a search
1946 * 3) Allowing a new search
1948 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1949 /* Save current throughput to compare with "search" throughput*/
1950 lq_sta->last_tpt = current_tpt;
1952 /* Select a new "search" modulation mode to try.
1953 * If one is found, set up the new "search" table. */
1954 if (is_legacy(tbl->lq_type))
1955 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1956 else if (is_siso(tbl->lq_type))
1957 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1959 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1961 /* If new "search" mode was selected, set up in uCode table */
1962 if (lq_sta->search_better_tbl) {
1963 /* Access the "search" table, clear its history. */
1964 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1965 for (i = 0; i < IWL_RATE_COUNT; i++)
1966 rs_rate_scale_clear_window(&(tbl->win[i]));
1968 /* Use new "search" start rate */
1969 index = iwl4965_hwrate_to_plcp_idx(
1972 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1973 tbl->current_rate, index);
1974 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1975 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1978 /* If the "active" (non-search) mode was legacy,
1979 * and we've tried switching antennas,
1980 * but we haven't been able to try HT modes (not available),
1981 * stay with best antenna legacy modulation for a while
1982 * before next round of mode comparisons. */
1983 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1984 if (is_legacy(tbl1->lq_type) &&
1985 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1986 (lq_sta->action_counter >= 1)) {
1987 lq_sta->action_counter = 0;
1988 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
1989 rs_set_stay_in_table(priv, 1, lq_sta);
1992 /* If we're in an HT mode, and all 3 mode switch actions
1993 * have been tried and compared, stay in this best modulation
1994 * mode for a while before next round of mode comparisons. */
1995 if (lq_sta->enable_counter &&
1996 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1997 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
1998 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
1999 (tid != MAX_TID_COUNT)) {
2000 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2001 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2003 lq_sta->action_counter = 0;
2004 rs_set_stay_in_table(priv, 0, lq_sta);
2008 * Else, don't search for a new modulation mode.
2009 * Put new timestamp in stay-in-modulation-mode flush timer if:
2010 * 1) Not changing rates right now
2011 * 2) Not just finishing up a search
2012 * 3) flush timer is empty
2015 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2016 lq_sta->flush_timer = jiffies;
2020 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2022 sta->last_txrate_idx = i;
2024 /* sta->txrate_idx is an index to A mode rates which start
2025 * at IWL_FIRST_OFDM_RATE
2027 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2028 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2030 sta->txrate_idx = i;
2036 static void rs_initialize_lq(struct iwl_priv *priv,
2037 struct ieee80211_conf *conf,
2038 struct sta_info *sta)
2040 struct iwl4965_lq_sta *lq_sta;
2041 struct iwl4965_scale_tbl_info *tbl;
2045 u8 use_green = rs_use_green(priv, conf);
2049 if (!sta || !sta->rate_ctrl_priv)
2052 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2053 i = sta->last_txrate_idx;
2055 if ((lq_sta->lq.sta_id == 0xff) &&
2056 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2059 valid_tx_ant = priv->hw_params.valid_tx_ant;
2061 if (!lq_sta->search_better_tbl)
2062 active_tbl = lq_sta->active_tbl;
2064 active_tbl = 1 - lq_sta->active_tbl;
2066 tbl = &(lq_sta->lq_info[active_tbl]);
2068 if ((i < 0) || (i >= IWL_RATE_COUNT))
2071 /* FIXME:RS: This is also wrong in 4965 */
2072 rate = iwl_rates[i].plcp;
2073 rate |= RATE_MCS_ANT_B_MSK;
2074 rate &= ~RATE_MCS_ANT_A_MSK;
2076 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2077 rate |= RATE_MCS_CCK_MSK;
2079 tbl->ant_type = ANT_B;
2080 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2081 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2082 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2084 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2085 tbl->current_rate = rate;
2086 rs_set_expected_tpt_table(lq_sta, tbl);
2087 rs_fill_link_cmd(NULL, lq_sta, rate);
2088 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2093 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2094 struct ieee80211_supported_band *sband,
2095 struct sk_buff *skb,
2096 struct rate_selection *sel)
2100 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2101 struct ieee80211_conf *conf = &local->hw.conf;
2102 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2103 struct sta_info *sta;
2105 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2106 struct iwl4965_lq_sta *lq_sta;
2108 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2112 sta = sta_info_get(local, hdr->addr1);
2114 /* Send management frames and broadcast/multicast data using lowest
2116 fc = le16_to_cpu(hdr->frame_control);
2117 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2118 !sta || !sta->rate_ctrl_priv) {
2119 sel->rate_idx = rate_lowest_index(local, sband, sta);
2123 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2124 i = sta->last_txrate_idx;
2126 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2127 !lq_sta->ibss_sta_added) {
2128 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2129 DECLARE_MAC_BUF(mac);
2131 if (sta_id == IWL_INVALID_STATION) {
2132 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2133 print_mac(mac, hdr->addr1));
2134 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2135 0, CMD_ASYNC, NULL);
2137 if ((sta_id != IWL_INVALID_STATION)) {
2138 lq_sta->lq.sta_id = sta_id;
2139 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2140 lq_sta->ibss_sta_added = 1;
2141 rs_initialize_lq(priv, conf, sta);
2143 if (!lq_sta->ibss_sta_added)
2148 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2149 sel->rate_idx = rate_lowest_index(local, sband, sta);
2153 if (sband->band == IEEE80211_BAND_5GHZ)
2154 i -= IWL_FIRST_OFDM_RATE;
2160 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2162 struct iwl4965_lq_sta *lq_sta;
2163 struct iwl_priv *priv;
2166 priv = (struct iwl_priv *)priv_rate;
2167 IWL_DEBUG_RATE("create station rate scale window\n");
2169 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2173 lq_sta->lq.sta_id = 0xff;
2176 for (j = 0; j < LQ_SIZE; j++)
2177 for (i = 0; i < IWL_RATE_COUNT; i++)
2178 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2183 static void rs_rate_init(void *priv_rate, void *priv_sta,
2184 struct ieee80211_local *local,
2185 struct sta_info *sta)
2188 struct ieee80211_conf *conf = &local->hw.conf;
2189 struct ieee80211_supported_band *sband;
2190 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2191 struct iwl4965_lq_sta *lq_sta = priv_sta;
2193 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2195 lq_sta->flush_timer = 0;
2196 lq_sta->supp_rates = sta->supp_rates[sband->band];
2197 sta->txrate_idx = 3;
2198 for (j = 0; j < LQ_SIZE; j++)
2199 for (i = 0; i < IWL_RATE_COUNT; i++)
2200 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2202 IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2203 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2204 * the lowest or the highest rate.. Could consider using RSSI from
2205 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2208 lq_sta->ibss_sta_added = 0;
2209 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2210 u8 sta_id = iwl_find_station(priv, sta->addr);
2211 DECLARE_MAC_BUF(mac);
2213 /* for IBSS the call are from tasklet */
2214 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2215 print_mac(mac, sta->addr));
2217 if (sta_id == IWL_INVALID_STATION) {
2218 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2219 print_mac(mac, sta->addr));
2220 sta_id = iwl_add_station_flags(priv, sta->addr,
2221 0, CMD_ASYNC, NULL);
2223 if ((sta_id != IWL_INVALID_STATION)) {
2224 lq_sta->lq.sta_id = sta_id;
2225 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2227 /* FIXME: this is w/a remove it later */
2228 priv->assoc_station_added = 1;
2231 /* Find highest tx rate supported by hardware and destination station */
2232 for (i = 0; i < sband->n_bitrates; i++)
2233 if (sta->supp_rates[sband->band] & BIT(i))
2234 sta->txrate_idx = i;
2236 sta->last_txrate_idx = sta->txrate_idx;
2237 /* WTF is with this bogus comment? A doesn't have cck rates */
2238 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2239 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2240 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2243 lq_sta->is_green = rs_use_green(priv, conf);
2244 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2245 lq_sta->active_rate_basic = priv->active_rate_basic;
2246 lq_sta->band = priv->band;
2248 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2249 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2251 lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2252 lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2253 lq_sta->active_siso_rate &= ~((u16)0x2);
2254 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2257 lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2258 lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2259 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2260 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2262 lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2263 lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2264 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2265 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2267 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2268 lq_sta->active_siso_rate,
2269 lq_sta->active_mimo2_rate,
2270 lq_sta->active_mimo3_rate);
2272 /* These values will be overriden later */
2273 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2274 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2276 /* as default allow aggregation for all tids */
2277 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2278 #ifdef CONFIG_MAC80211_DEBUGFS
2282 if (priv->assoc_station_added)
2283 priv->lq_mngr.lq_ready = 1;
2285 rs_initialize_lq(priv, conf, sta);
2288 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2289 struct iwl4965_lq_sta *lq_sta,
2292 struct iwl4965_scale_tbl_info tbl_type;
2295 int repeat_rate = 0;
2296 u8 ant_toggle_cnt = 0;
2297 u8 use_ht_possible = 1;
2298 u8 valid_tx_ant = 0;
2299 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2301 /* Override starting rate (index 0) if needed for debug purposes */
2302 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2304 /* Interpret new_rate (rate_n_flags) */
2305 memset(&tbl_type, 0, sizeof(tbl_type));
2306 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2307 &tbl_type, &rate_idx);
2309 /* How many times should we repeat the initial rate? */
2310 if (is_legacy(tbl_type.lq_type)) {
2312 repeat_rate = IWL_NUMBER_TRY;
2314 repeat_rate = IWL_HT_NUMBER_TRY;
2317 lq_cmd->general_params.mimo_delimiter =
2318 is_mimo(tbl_type.lq_type) ? 1 : 0;
2320 /* Fill 1st table entry (index 0) */
2321 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2323 if (num_of_ant(tbl_type.ant_type) == 1) {
2324 lq_cmd->general_params.single_stream_ant_msk =
2326 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2327 lq_cmd->general_params.dual_stream_ant_msk =
2329 } /* otherwise we don't modify the existing value */
2335 valid_tx_ant = priv->hw_params.valid_tx_ant;
2337 /* Fill rest of rate table */
2338 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2339 /* Repeat initial/next rate.
2340 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2341 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2342 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2343 if (is_legacy(tbl_type.lq_type)) {
2344 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2347 rs_toggle_antenna(valid_tx_ant,
2348 &new_rate, &tbl_type))
2352 /* Override next rate if needed for debug purposes */
2353 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2355 /* Fill next table entry */
2356 lq_cmd->rs_table[index].rate_n_flags =
2357 cpu_to_le32(new_rate);
2362 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2365 /* Indicate to uCode which entries might be MIMO.
2366 * If initial rate was MIMO, this will finally end up
2367 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2368 if (is_mimo(tbl_type.lq_type))
2369 lq_cmd->general_params.mimo_delimiter = index;
2372 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2375 /* How many times should we repeat the next rate? */
2376 if (is_legacy(tbl_type.lq_type)) {
2377 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2380 rs_toggle_antenna(valid_tx_ant,
2381 &new_rate, &tbl_type))
2384 repeat_rate = IWL_NUMBER_TRY;
2386 repeat_rate = IWL_HT_NUMBER_TRY;
2389 /* Don't allow HT rates after next pass.
2390 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2391 use_ht_possible = 0;
2393 /* Override next rate if needed for debug purposes */
2394 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2396 /* Fill next table entry */
2397 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2403 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2404 lq_cmd->agg_params.agg_dis_start_th = 3;
2405 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2408 static void *rs_alloc(struct ieee80211_local *local)
2410 return local->hw.priv;
2412 /* rate scale requires free function to be implemented */
2413 static void rs_free(void *priv_rate)
2418 static void rs_clear(void *priv_rate)
2420 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2422 IWL_DEBUG_RATE("enter\n");
2424 priv->lq_mngr.lq_ready = 0;
2426 IWL_DEBUG_RATE("leave\n");
2429 static void rs_free_sta(void *priv_rate, void *priv_sta)
2431 struct iwl4965_lq_sta *lq_sta = priv_sta;
2432 struct iwl_priv *priv;
2434 priv = (struct iwl_priv *)priv_rate;
2435 IWL_DEBUG_RATE("enter\n");
2437 IWL_DEBUG_RATE("leave\n");
2441 #ifdef CONFIG_MAC80211_DEBUGFS
2442 static int open_file_generic(struct inode *inode, struct file *file)
2444 file->private_data = inode->i_private;
2447 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2448 u32 *rate_n_flags, int index)
2450 struct iwl_priv *priv;
2453 if (lq_sta->dbg_fixed_rate) {
2455 *rate_n_flags = lq_sta->dbg_fixed_rate;
2457 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2458 *rate_n_flags = 0x800D;
2460 *rate_n_flags = 0x820A;
2462 IWL_DEBUG_RATE("Fixed rate ON\n");
2464 IWL_DEBUG_RATE("Fixed rate OFF\n");
2468 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2469 const char __user *user_buf, size_t count, loff_t *ppos)
2471 struct iwl4965_lq_sta *lq_sta = file->private_data;
2472 struct iwl_priv *priv;
2478 memset(buf, 0, sizeof(buf));
2479 buf_size = min(count, sizeof(buf) - 1);
2480 if (copy_from_user(buf, user_buf, buf_size))
2483 if (sscanf(buf, "%x", &parsed_rate) == 1)
2484 lq_sta->dbg_fixed_rate = parsed_rate;
2486 lq_sta->dbg_fixed_rate = 0;
2488 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2489 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2490 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2491 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2493 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2494 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2496 if (lq_sta->dbg_fixed_rate) {
2497 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2498 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2504 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2505 char __user *user_buf, size_t count, loff_t *ppos)
2511 struct iwl4965_lq_sta *lq_sta = file->private_data;
2513 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2514 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2515 lq_sta->total_failed, lq_sta->total_success,
2516 lq_sta->active_legacy_rate);
2517 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2518 lq_sta->dbg_fixed_rate);
2519 desc += sprintf(buff+desc, "general:"
2520 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2521 lq_sta->lq.general_params.flags,
2522 lq_sta->lq.general_params.mimo_delimiter,
2523 lq_sta->lq.general_params.single_stream_ant_msk,
2524 lq_sta->lq.general_params.dual_stream_ant_msk);
2526 desc += sprintf(buff+desc, "agg:"
2527 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2528 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2529 lq_sta->lq.agg_params.agg_dis_start_th,
2530 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2532 desc += sprintf(buff+desc,
2533 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2534 lq_sta->lq.general_params.start_rate_index[0],
2535 lq_sta->lq.general_params.start_rate_index[1],
2536 lq_sta->lq.general_params.start_rate_index[2],
2537 lq_sta->lq.general_params.start_rate_index[3]);
2540 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2541 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2542 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2544 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2547 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2548 .write = rs_sta_dbgfs_scale_table_write,
2549 .read = rs_sta_dbgfs_scale_table_read,
2550 .open = open_file_generic,
2552 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2553 char __user *user_buf, size_t count, loff_t *ppos)
2559 struct iwl4965_lq_sta *lq_sta = file->private_data;
2560 for (i = 0; i < LQ_SIZE; i++) {
2561 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2563 lq_sta->active_tbl == i?"*":"x",
2564 lq_sta->lq_info[i].lq_type,
2565 lq_sta->lq_info[i].is_SGI,
2566 lq_sta->lq_info[i].is_fat,
2567 lq_sta->lq_info[i].is_dup,
2568 lq_sta->lq_info[i].current_rate);
2569 for (j = 0; j < IWL_RATE_COUNT; j++) {
2570 desc += sprintf(buff+desc,
2571 "counter=%d success=%d %%=%d\n",
2572 lq_sta->lq_info[i].win[j].counter,
2573 lq_sta->lq_info[i].win[j].success_counter,
2574 lq_sta->lq_info[i].win[j].success_ratio);
2577 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2580 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2581 .read = rs_sta_dbgfs_stats_table_read,
2582 .open = open_file_generic,
2585 static void rs_add_debugfs(void *priv, void *priv_sta,
2588 struct iwl4965_lq_sta *lq_sta = priv_sta;
2589 lq_sta->rs_sta_dbgfs_scale_table_file =
2590 debugfs_create_file("rate_scale_table", 0600, dir,
2591 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2592 lq_sta->rs_sta_dbgfs_stats_table_file =
2593 debugfs_create_file("rate_stats_table", 0600, dir,
2594 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2595 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2596 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2597 &lq_sta->tx_agg_tid_en);
2601 static void rs_remove_debugfs(void *priv, void *priv_sta)
2603 struct iwl4965_lq_sta *lq_sta = priv_sta;
2604 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2605 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2606 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2610 static struct rate_control_ops rs_ops = {
2613 .tx_status = rs_tx_status,
2614 .get_rate = rs_get_rate,
2615 .rate_init = rs_rate_init,
2619 .alloc_sta = rs_alloc_sta,
2620 .free_sta = rs_free_sta,
2621 #ifdef CONFIG_MAC80211_DEBUGFS
2622 .add_sta_debugfs = rs_add_debugfs,
2623 .remove_sta_debugfs = rs_remove_debugfs,
2627 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2629 struct ieee80211_local *local = hw_to_local(hw);
2630 struct iwl_priv *priv = hw->priv;
2631 struct iwl4965_lq_sta *lq_sta;
2632 struct sta_info *sta;
2634 u32 samples = 0, success = 0, good = 0;
2635 unsigned long now = jiffies;
2637 u8 lq_type, antenna;
2641 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2642 if (!sta || !sta->rate_ctrl_priv) {
2644 IWL_DEBUG_RATE("leave - no private rate data!\n");
2646 IWL_DEBUG_RATE("leave - no station!\n");
2648 return sprintf(buf, "station %d not found\n", sta_id);
2651 lq_sta = (void *)sta->rate_ctrl_priv;
2653 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2654 antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2656 if (is_legacy(lq_type))
2657 i = IWL_RATE_54M_INDEX;
2659 i = IWL_RATE_60M_INDEX;
2663 int active = lq_sta->active_tbl;
2666 sprintf(&buf[cnt], " %2dMbs: ", iwl_rates[i].ieee / 2);
2668 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2669 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2671 (lq_sta->lq_info[active].win[i].data & mask)
2674 samples += lq_sta->lq_info[active].win[i].counter;
2675 good += lq_sta->lq_info[active].win[i].success_counter;
2676 success += lq_sta->lq_info[active].win[i].success_counter *
2679 if (lq_sta->lq_info[active].win[i].stamp) {
2681 jiffies_to_msecs(now -
2682 lq_sta->lq_info[active].win[i].stamp);
2684 if (delta > max_time)
2687 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2691 j = iwl4965_get_prev_ieee_rate(i);
2698 * Display the average rate of all samples taken.
2699 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2700 * added from iwl_rates is actually 2X the rate.
2703 cnt += sprintf(&buf[cnt],
2704 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2705 "%3d%% success (%d good packets over %d tries)\n",
2706 success / (2 * samples), (success * 5 / samples) % 10,
2707 max_time, good * 100 / samples, good, samples);
2709 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2711 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2712 "active_search %d rate index %d\n", lq_type, antenna,
2713 lq_sta->search_better_tbl, sta->last_txrate_idx);
2719 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2721 struct iwl_priv *priv = hw->priv;
2723 priv->lq_mngr.lq_ready = 1;
2726 int iwl4965_rate_control_register(void)
2728 return ieee80211_rate_control_register(&rs_ops);
2731 void iwl4965_rate_control_unregister(void)
2733 ieee80211_rate_control_unregister(&rs_ops);